diff options
| -rw-r--r-- | drivers/staging/ramster/Kconfig | 14 | ||||
| -rw-r--r-- | drivers/staging/ramster/Makefile | 3 | ||||
| -rw-r--r-- | drivers/staging/ramster/ramster/heartbeat.c | 462 | ||||
| -rw-r--r-- | drivers/staging/ramster/ramster/heartbeat.h | 87 | ||||
| -rw-r--r-- | drivers/staging/ramster/ramster/masklog.c | 155 | ||||
| -rw-r--r-- | drivers/staging/ramster/ramster/masklog.h | 220 | ||||
| -rw-r--r-- | drivers/staging/ramster/ramster/nodemanager.c | 995 | ||||
| -rw-r--r-- | drivers/staging/ramster/ramster/nodemanager.h | 88 | ||||
| -rw-r--r-- | drivers/staging/ramster/ramster/r2net.c | 414 | ||||
| -rw-r--r-- | drivers/staging/ramster/ramster/ramster.c | 985 | ||||
| -rw-r--r-- | drivers/staging/ramster/ramster/ramster.h | 161 | ||||
| -rw-r--r-- | drivers/staging/ramster/ramster/ramster_nodemanager.h | 39 | ||||
| -rw-r--r-- | drivers/staging/ramster/ramster/tcp.c | 2253 | ||||
| -rw-r--r-- | drivers/staging/ramster/ramster/tcp.h | 159 | ||||
| -rw-r--r-- | drivers/staging/ramster/ramster/tcp_internal.h | 248 |
15 files changed, 6283 insertions, 0 deletions
diff --git a/drivers/staging/ramster/Kconfig b/drivers/staging/ramster/Kconfig index 7db0592b652e..843c54101438 100644 --- a/drivers/staging/ramster/Kconfig +++ b/drivers/staging/ramster/Kconfig @@ -14,3 +14,17 @@ config ZCACHE2 technical disagreements. It is intended that they will merge again in the future. Until then, zcache2 is a single-node version of ramster. + +config RAMSTER + bool "Cross-machine RAM capacity sharing, aka peer-to-peer tmem" + depends on CONFIGFS_FS=y && SYSFS=y && !HIGHMEM && ZCACHE2=y + # must ensure struct page is 8-byte aligned + select HAVE_ALIGNED_STRUCT_PAGE if !64_BIT + default n + help + RAMster allows RAM on other machines in a cluster to be utilized + dynamically and symmetrically instead of swapping to a local swap + disk, thus improving performance on memory-constrained workloads + while minimizing total RAM across the cluster. RAMster, like + zcache2, compresses swap pages into local RAM, but then remotifies + the compressed pages to another node in the RAMster cluster. diff --git a/drivers/staging/ramster/Makefile b/drivers/staging/ramster/Makefile index 800e70c98b41..2d8b9d0a6a8b 100644 --- a/drivers/staging/ramster/Makefile +++ b/drivers/staging/ramster/Makefile @@ -1,3 +1,6 @@ zcache-y := zcache-main.o tmem.o zbud.o +zcache-$(CONFIG_RAMSTER) += ramster/ramster.o ramster/r2net.o +zcache-$(CONFIG_RAMSTER) += ramster/nodemanager.o ramster/tcp.o +zcache-$(CONFIG_RAMSTER) += ramster/heartbeat.o ramster/masklog.o obj-$(CONFIG_ZCACHE2) += zcache.o diff --git a/drivers/staging/ramster/ramster/heartbeat.c b/drivers/staging/ramster/ramster/heartbeat.c new file mode 100644 index 000000000000..75d3fe80b055 --- /dev/null +++ b/drivers/staging/ramster/ramster/heartbeat.c @@ -0,0 +1,462 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * Copyright (C) 2004, 2005, 2012 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/configfs.h> + +#include "heartbeat.h" +#include "tcp.h" +#include "nodemanager.h" + +#include "masklog.h" + +/* + * The first heartbeat pass had one global thread that would serialize all hb + * callback calls. This global serializing sem should only be removed once + * we've made sure that all callees can deal with being called concurrently + * from multiple hb region threads. + */ +static DECLARE_RWSEM(r2hb_callback_sem); + +/* + * multiple hb threads are watching multiple regions. A node is live + * whenever any of the threads sees activity from the node in its region. + */ +static DEFINE_SPINLOCK(r2hb_live_lock); +static unsigned long r2hb_live_node_bitmap[BITS_TO_LONGS(R2NM_MAX_NODES)]; + +static struct r2hb_callback { + struct list_head list; +} r2hb_callbacks[R2HB_NUM_CB]; + +enum r2hb_heartbeat_modes { + R2HB_HEARTBEAT_LOCAL = 0, + R2HB_HEARTBEAT_GLOBAL, + R2HB_HEARTBEAT_NUM_MODES, +}; + +char *r2hb_heartbeat_mode_desc[R2HB_HEARTBEAT_NUM_MODES] = { + "local", /* R2HB_HEARTBEAT_LOCAL */ + "global", /* R2HB_HEARTBEAT_GLOBAL */ +}; + +unsigned int r2hb_dead_threshold = R2HB_DEFAULT_DEAD_THRESHOLD; +unsigned int r2hb_heartbeat_mode = R2HB_HEARTBEAT_LOCAL; + +/* Only sets a new threshold if there are no active regions. + * + * No locking or otherwise interesting code is required for reading + * r2hb_dead_threshold as it can't change once regions are active and + * it's not interesting to anyone until then anyway. */ +static void r2hb_dead_threshold_set(unsigned int threshold) +{ + if (threshold > R2HB_MIN_DEAD_THRESHOLD) { + spin_lock(&r2hb_live_lock); + r2hb_dead_threshold = threshold; + spin_unlock(&r2hb_live_lock); + } +} + +static int r2hb_global_hearbeat_mode_set(unsigned int hb_mode) +{ + int ret = -1; + + if (hb_mode < R2HB_HEARTBEAT_NUM_MODES) { + spin_lock(&r2hb_live_lock); + r2hb_heartbeat_mode = hb_mode; + ret = 0; + spin_unlock(&r2hb_live_lock); + } + + return ret; +} + +void r2hb_exit(void) +{ +} + +int r2hb_init(void) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(r2hb_callbacks); i++) + INIT_LIST_HEAD(&r2hb_callbacks[i].list); + + memset(r2hb_live_node_bitmap, 0, sizeof(r2hb_live_node_bitmap)); + + return 0; +} + +/* if we're already in a callback then we're already serialized by the sem */ +static void r2hb_fill_node_map_from_callback(unsigned long *map, + unsigned bytes) +{ + BUG_ON(bytes < (BITS_TO_LONGS(R2NM_MAX_NODES) * sizeof(unsigned long))); + + memcpy(map, &r2hb_live_node_bitmap, bytes); +} + +/* + * get a map of all nodes that are heartbeating in any regions + */ +void r2hb_fill_node_map(unsigned long *map, unsigned bytes) +{ + /* callers want to serialize this map and callbacks so that they + * can trust that they don't miss nodes coming to the party */ + down_read(&r2hb_callback_sem); + spin_lock(&r2hb_live_lock); + r2hb_fill_node_map_from_callback(map, bytes); + spin_unlock(&r2hb_live_lock); + up_read(&r2hb_callback_sem); +} +EXPORT_SYMBOL_GPL(r2hb_fill_node_map); + +/* + * heartbeat configfs bits. The heartbeat set is a default set under + * the cluster set in nodemanager.c. + */ + +/* heartbeat set */ + +struct r2hb_hb_group { + struct config_group hs_group; + /* some stuff? */ +}; + +static struct r2hb_hb_group *to_r2hb_hb_group(struct config_group *group) +{ + return group ? + container_of(group, struct r2hb_hb_group, hs_group) + : NULL; +} + +static struct config_item r2hb_config_item; + +static struct config_item *r2hb_hb_group_make_item(struct config_group *group, + const char *name) +{ + int ret; + + if (strlen(name) > R2HB_MAX_REGION_NAME_LEN) { + ret = -ENAMETOOLONG; + goto free; + } + + config_item_put(&r2hb_config_item); + + return &r2hb_config_item; +free: + return ERR_PTR(ret); +} + +static void r2hb_hb_group_drop_item(struct config_group *group, + struct config_item *item) +{ + if (r2hb_global_heartbeat_active()) { + pr_notice("ramster: Heartbeat %s on region %s (%s)\n", + "stopped/aborted", config_item_name(item), + "no region"); + } + + config_item_put(item); +} + +struct r2hb_hb_group_attribute { + struct configfs_attribute attr; + ssize_t (*show)(struct r2hb_hb_group *, char *); + ssize_t (*store)(struct r2hb_hb_group *, const char *, size_t); +}; + +static ssize_t r2hb_hb_group_show(struct config_item *item, + struct configfs_attribute *attr, + char *page) +{ + struct r2hb_hb_group *reg = to_r2hb_hb_group(to_config_group(item)); + struct r2hb_hb_group_attribute *r2hb_hb_group_attr = + container_of(attr, struct r2hb_hb_group_attribute, attr); + ssize_t ret = 0; + + if (r2hb_hb_group_attr->show) + ret = r2hb_hb_group_attr->show(reg, page); + return ret; +} + +static ssize_t r2hb_hb_group_store(struct config_item *item, + struct configfs_attribute *attr, + const char *page, size_t count) +{ + struct r2hb_hb_group *reg = to_r2hb_hb_group(to_config_group(item)); + struct r2hb_hb_group_attribute *r2hb_hb_group_attr = + container_of(attr, struct r2hb_hb_group_attribute, attr); + ssize_t ret = -EINVAL; + + if (r2hb_hb_group_attr->store) + ret = r2hb_hb_group_attr->store(reg, page, count); + return ret; +} + +static ssize_t r2hb_hb_group_threshold_show(struct r2hb_hb_group *group, + char *page) +{ + return sprintf(page, "%u\n", r2hb_dead_threshold); +} + +static ssize_t r2hb_hb_group_threshold_store(struct r2hb_hb_group *group, + const char *page, + size_t count) +{ + unsigned long tmp; + char *p = (char *)page; + int err; + + err = kstrtoul(p, 10, &tmp); + if (err) + return err; + + /* this will validate ranges for us. */ + r2hb_dead_threshold_set((unsigned int) tmp); + + return count; +} + +static +ssize_t r2hb_hb_group_mode_show(struct r2hb_hb_group *group, + char *page) +{ + return sprintf(page, "%s\n", + r2hb_heartbeat_mode_desc[r2hb_heartbeat_mode]); +} + +static +ssize_t r2hb_hb_group_mode_store(struct r2hb_hb_group *group, + const char *page, size_t count) +{ + unsigned int i; + int ret; + size_t len; + + len = (page[count - 1] == '\n') ? count - 1 : count; + if (!len) + return -EINVAL; + + for (i = 0; i < R2HB_HEARTBEAT_NUM_MODES; ++i) { + if (strnicmp(page, r2hb_heartbeat_mode_desc[i], len)) + continue; + + ret = r2hb_global_hearbeat_mode_set(i); + if (!ret) + pr_notice("ramster: Heartbeat mode set to %s\n", + r2hb_heartbeat_mode_desc[i]); + return count; + } + + return -EINVAL; + +} + +static struct r2hb_hb_group_attribute r2hb_hb_group_attr_threshold = { + .attr = { .ca_owner = THIS_MODULE, + .ca_name = "dead_threshold", + .ca_mode = S_IRUGO | S_IWUSR }, + .show = r2hb_hb_group_threshold_show, + .store = r2hb_hb_group_threshold_store, +}; + +static struct r2hb_hb_group_attribute r2hb_hb_group_attr_mode = { + .attr = { .ca_owner = THIS_MODULE, + .ca_name = "mode", + .ca_mode = S_IRUGO | S_IWUSR }, + .show = r2hb_hb_group_mode_show, + .store = r2hb_hb_group_mode_store, +}; + +static struct configfs_attribute *r2hb_hb_group_attrs[] = { + &r2hb_hb_group_attr_threshold.attr, + &r2hb_hb_group_attr_mode.attr, + NULL, +}; + +static struct configfs_item_operations r2hb_hearbeat_group_item_ops = { + .show_attribute = r2hb_hb_group_show, + .store_attribute = r2hb_hb_group_store, +}; + +static struct configfs_group_operations r2hb_hb_group_group_ops = { + .make_item = r2hb_hb_group_make_item, + .drop_item = r2hb_hb_group_drop_item, +}; + +static struct config_item_type r2hb_hb_group_type = { + .ct_group_ops = &r2hb_hb_group_group_ops, + .ct_item_ops = &r2hb_hearbeat_group_item_ops, + .ct_attrs = r2hb_hb_group_attrs, + .ct_owner = THIS_MODULE, +}; + +/* this is just here to avoid touching group in heartbeat.h which the + * entire damn world #includes */ +struct config_group *r2hb_alloc_hb_set(void) +{ + struct r2hb_hb_group *hs = NULL; + struct config_group *ret = NULL; + + hs = kzalloc(sizeof(struct r2hb_hb_group), GFP_KERNEL); + if (hs == NULL) + goto out; + + config_group_init_type_name(&hs->hs_group, "heartbeat", + &r2hb_hb_group_type); + + ret = &hs->hs_group; +out: + if (ret == NULL) + kfree(hs); + return ret; +} + +void r2hb_free_hb_set(struct config_group *group) +{ + struct r2hb_hb_group *hs = to_r2hb_hb_group(group); + kfree(hs); +} + +/* hb callback registration and issuing */ + +static struct r2hb_callback *hbcall_from_type(enum r2hb_callback_type type) +{ + if (type == R2HB_NUM_CB) + return ERR_PTR(-EINVAL); + + return &r2hb_callbacks[type]; +} + +void r2hb_setup_callback(struct r2hb_callback_func *hc, + enum r2hb_callback_type type, + r2hb_cb_func *func, + void *data, + int priority) +{ + INIT_LIST_HEAD(&hc->hc_item); + hc->hc_func = func; + hc->hc_data = data; + hc->hc_priority = priority; + hc->hc_type = type; + hc->hc_magic = R2HB_CB_MAGIC; +} +EXPORT_SYMBOL_GPL(r2hb_setup_callback); + +int r2hb_register_callback(const char *region_uuid, + struct r2hb_callback_func *hc) +{ + struct r2hb_callback_func *tmp; + struct list_head *iter; + struct r2hb_callback *hbcall; + int ret; + + BUG_ON(hc->hc_magic != R2HB_CB_MAGIC); + BUG_ON(!list_empty(&hc->hc_item)); + + hbcall = hbcall_from_type(hc->hc_type); + if (IS_ERR(hbcall)) { + ret = PTR_ERR(hbcall); + goto out; + } + + down_write(&r2hb_callback_sem); + + list_for_each(iter, &hbcall->list) { + tmp = list_entry(iter, struct r2hb_callback_func, hc_item); + if (hc->hc_priority < tmp->hc_priority) { + list_add_tail(&hc->hc_item, iter); + break; + } + } + if (list_empty(&hc->hc_item)) + list_add_tail(&hc->hc_item, &hbcall->list); + + up_write(&r2hb_callback_sem); + ret = 0; +out: + mlog(ML_CLUSTER, "returning %d on behalf of %p for funcs %p\n", + ret, __builtin_return_address(0), hc); + return ret; +} +EXPORT_SYMBOL_GPL(r2hb_register_callback); + +void r2hb_unregister_callback(const char *region_uuid, + struct r2hb_callback_func *hc) +{ + BUG_ON(hc->hc_magic != R2HB_CB_MAGIC); + + mlog(ML_CLUSTER, "on behalf of %p for funcs %p\n", + __builtin_return_address(0), hc); + + /* XXX Can this happen _with_ a region reference? */ + if (list_empty(&hc->hc_item)) + return; + + down_write(&r2hb_callback_sem); + + list_del_init(&hc->hc_item); + + up_write(&r2hb_callback_sem); +} +EXPORT_SYMBOL_GPL(r2hb_unregister_callback); + +int r2hb_check_node_heartbeating_from_callback(u8 node_num) +{ + unsigned long testing_map[BITS_TO_LONGS(R2NM_MAX_NODES)]; + + r2hb_fill_node_map_from_callback(testing_map, sizeof(testing_map)); + if (!test_bit(node_num, testing_map)) { + mlog(ML_HEARTBEAT, + "node (%u) does not have heartbeating enabled.\n", + node_num); + return 0; + } + + return 1; +} +EXPORT_SYMBOL_GPL(r2hb_check_node_heartbeating_from_callback); + +void r2hb_stop_all_regions(void) +{ +} +EXPORT_SYMBOL_GPL(r2hb_stop_all_regions); + +/* + * this is just a hack until we get the plumbing which flips file systems + * read only and drops the hb ref instead of killing the node dead. + */ +int r2hb_global_heartbeat_active(void) +{ + return (r2hb_heartbeat_mode == R2HB_HEARTBEAT_GLOBAL); +} +EXPORT_SYMBOL(r2hb_global_heartbeat_active); + +/* added for RAMster */ +void r2hb_manual_set_node_heartbeating(int node_num) +{ + if (node_num < R2NM_MAX_NODES) + set_bit(node_num, r2hb_live_node_bitmap); +} +EXPORT_SYMBOL(r2hb_manual_set_node_heartbeating); diff --git a/drivers/staging/ramster/ramster/heartbeat.h b/drivers/staging/ramster/ramster/heartbeat.h new file mode 100644 index 000000000000..6cbc775bd63b --- /dev/null +++ b/drivers/staging/ramster/ramster/heartbeat.h @@ -0,0 +1,87 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * heartbeat.h + * + * Function prototypes + * + * Copyright (C) 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + * + */ + +#ifndef R2CLUSTER_HEARTBEAT_H +#define R2CLUSTER_HEARTBEAT_H + +#define R2HB_REGION_TIMEOUT_MS 2000 + +#define R2HB_MAX_REGION_NAME_LEN 32 + +/* number of changes to be seen as live */ +#define R2HB_LIVE_THRESHOLD 2 +/* number of equal samples to be seen as dead */ +extern unsigned int r2hb_dead_threshold; +#define R2HB_DEFAULT_DEAD_THRESHOLD 31 +/* Otherwise MAX_WRITE_TIMEOUT will be zero... */ +#define R2HB_MIN_DEAD_THRESHOLD 2 +#define R2HB_MAX_WRITE_TIMEOUT_MS \ + (R2HB_REGION_TIMEOUT_MS * (r2hb_dead_threshold - 1)) + +#define R2HB_CB_MAGIC 0x51d1e4ec + +/* callback stuff */ +enum r2hb_callback_type { + R2HB_NODE_DOWN_CB = 0, + R2HB_NODE_UP_CB, + R2HB_NUM_CB +}; + +struct r2nm_node; +typedef void (r2hb_cb_func)(struct r2nm_node *, int, void *); + +struct r2hb_callback_func { + u32 hc_magic; + struct list_head hc_item; + r2hb_cb_func *hc_func; + void *hc_data; + int hc_priority; + enum r2hb_callback_type hc_type; +}; + +struct config_group *r2hb_alloc_hb_set(void); +void r2hb_free_hb_set(struct config_group *group); + +void r2hb_setup_callback(struct r2hb_callback_func *hc, + enum r2hb_callback_type type, + r2hb_cb_func *func, + void *data, + int priority); +int r2hb_register_callback(const char *region_uuid, + struct r2hb_callback_func *hc); +void r2hb_unregister_callback(const char *region_uuid, + struct r2hb_callback_func *hc); +void r2hb_fill_node_map(unsigned long *map, + unsigned bytes); +void r2hb_exit(void); +int r2hb_init(void); +int r2hb_check_node_heartbeating_from_callback(u8 node_num); +void r2hb_stop_all_regions(void); +int r2hb_get_all_regions(char *region_uuids, u8 numregions); +int r2hb_global_heartbeat_active(void); +void r2hb_manual_set_node_heartbeating(int); + +#endif /* R2CLUSTER_HEARTBEAT_H */ diff --git a/drivers/staging/ramster/ramster/masklog.c b/drivers/staging/ramster/ramster/masklog.c new file mode 100644 index 000000000000..1261d8579aae --- /dev/null +++ b/drivers/staging/ramster/ramster/masklog.c @@ -0,0 +1,155 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * Copyright (C) 2004, 2005, 2012 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/proc_fs.h> +#include <linux/seq_file.h> +#include <linux/string.h> +#include <linux/uaccess.h> + +#include "masklog.h" + +struct mlog_bits r2_mlog_and_bits = MLOG_BITS_RHS(MLOG_INITIAL_AND_MASK); +EXPORT_SYMBOL_GPL(r2_mlog_and_bits); +struct mlog_bits r2_mlog_not_bits = MLOG_BITS_RHS(0); +EXPORT_SYMBOL_GPL(r2_mlog_not_bits); + +static ssize_t mlog_mask_show(u64 mask, char *buf) +{ + char *state; + + if (__mlog_test_u64(mask, r2_mlog_and_bits)) + state = "allow"; + else if (__mlog_test_u64(mask, r2_mlog_not_bits)) + state = "deny"; + else + state = "off"; + + return snprintf(buf, PAGE_SIZE, "%s\n", state); +} + +static ssize_t mlog_mask_store(u64 mask, const char *buf, size_t count) +{ + if (!strnicmp(buf, "allow", 5)) { + __mlog_set_u64(mask, r2_mlog_and_bits); + __mlog_clear_u64(mask, r2_mlog_not_bits); + } else if (!strnicmp(buf, "deny", 4)) { + __mlog_set_u64(mask, r2_mlog_not_bits); + __mlog_clear_u64(mask, r2_mlog_and_bits); + } else if (!strnicmp(buf, "off", 3)) { + __mlog_clear_u64(mask, r2_mlog_not_bits); + __mlog_clear_u64(mask, r2_mlog_and_bits); + } else + return -EINVAL; + + return count; +} + +struct mlog_attribute { + struct attribute attr; + u64 mask; +}; + +#define to_mlog_attr(_attr) container_of(_attr, struct mlog_attribute, attr) + +#define define_mask(_name) { \ + .attr = { \ + .name = #_name, \ + .mode = S_IRUGO | S_IWUSR, \ + }, \ + .mask = ML_##_name, \ +} + +static struct mlog_attribute mlog_attrs[MLOG_MAX_BITS] = { + define_mask(TCP), + define_mask(MSG), + define_mask(SOCKET), + define_mask(HEARTBEAT), + define_mask(HB_BIO), + define_mask(DLMFS), + define_mask(DLM), + define_mask(DLM_DOMAIN), + define_mask(DLM_THREAD), + define_mask(DLM_MASTER), + define_mask(DLM_RECOVERY), + define_mask(DLM_GLUE), + define_mask(VOTE), + define_mask(CONN), + define_mask(QUORUM), + define_mask(BASTS), + define_mask(CLUSTER), + define_mask(ERROR), + define_mask(NOTICE), + define_mask(KTHREAD), +}; + +static struct attribute *mlog_attr_ptrs[MLOG_MAX_BITS] = {NULL, }; + +static ssize_t mlog_show(struct kobject *obj, struct attribute *attr, + char *buf) +{ + struct mlog_attribute *mlog_attr = to_mlog_attr(attr); + + return mlog_mask_show(mlog_attr->mask, buf); +} + +static ssize_t mlog_store(struct kobject *obj, struct attribute *attr, + const char *buf, size_t count) +{ + struct mlog_attribute *mlog_attr = to_mlog_attr(attr); + + return mlog_mask_store(mlog_attr->mask, buf, count); +} + +static const struct sysfs_ops mlog_attr_ops = { + .show = mlog_show, + .store = mlog_store, +}; + +static struct kobj_type mlog_ktype = { + .default_attrs = mlog_attr_ptrs, + .sysfs_ops = &mlog_attr_ops, +}; + +static struct kset mlog_kset = { + .kobj = {.ktype = &mlog_ktype}, +}; + +int r2_mlog_sys_init(struct kset *r2cb_kset) +{ + int i = 0; + + while (mlog_attrs[i].attr.mode) { + mlog_attr_ptrs[i] = &mlog_attrs[i].attr; + i++; + } + mlog_attr_ptrs[i] = NULL; + + kobject_set_name(&mlog_kset.kobj, "logmask"); + mlog_kset.kobj.kset = r2cb_kset; + return kset_register(&mlog_kset); +} + +void r2_mlog_sys_shutdown(void) +{ + kset_unregister(&mlog_kset); +} diff --git a/drivers/staging/ramster/ramster/masklog.h b/drivers/staging/ramster/ramster/masklog.h new file mode 100644 index 000000000000..918ae110b699 --- /dev/null +++ b/drivers/staging/ramster/ramster/masklog.h @@ -0,0 +1,220 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * Copyright (C) 2005, 2012 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#ifndef R2CLUSTER_MASKLOG_H +#define R2CLUSTER_MASKLOG_H + +/* + * For now this is a trivial wrapper around printk() that gives the critical + * ability to enable sets of debugging output at run-time. In the future this + * will almost certainly be redirected to relayfs so that it can pay a + * substantially lower heisenberg tax. + * + * Callers associate the message with a bitmask and a global bitmask is + * maintained with help from /proc. If any of the bits match the message is + * output. + * + * We must have efficient bit tests on i386 and it seems gcc still emits crazy + * code for the 64bit compare. It emits very good code for the dual unsigned + * long tests, though, completely avoiding tests that can never pass if the + * caller gives a constant bitmask that fills one of the longs with all 0s. So + * the desire is to have almost all of the calls decided on by comparing just + * one of the longs. This leads to having infrequently given bits that are + * frequently matched in the high bits. + * + * _ERROR and _NOTICE are used for messages that always go to the console and + * have appropriate KERN_ prefixes. We wrap these in our function instead of + * just calling printk() so that this can eventually make its way through + * relayfs along with the debugging messages. Everything else gets KERN_DEBUG. + * The inline tests and macro dance give GCC the opportunity to quite cleverly + * only emit the appropriage printk() when the caller passes in a constant + * mask, as is almost always the case. + * + * All this bitmask nonsense is managed from the files under + * /sys/fs/r2cb/logmask/. Reading the files gives a straightforward + * indication of which bits are allowed (allow) or denied (off/deny). + * ENTRY deny + * EXIT deny + * TCP off + * MSG off + * SOCKET off + * ERROR allow + * NOTICE allow + * + * Writing changes the state of a given bit and requires a strictly formatted + * single write() call: + * + * write(fd, "allow", 5); + * + * Echoing allow/deny/off string into the logmask files can flip the bits + * on or off as expected; here is the bash script for example: + * + * log_mask="/sys/fs/r2cb/log_mask" + * for node in ENTRY EXIT TCP MSG SOCKET ERROR NOTICE; do + * echo allow >"$log_mask"/"$node" + * done + * + * The debugfs.ramster tool can also flip the bits with the -l option: + * + * debugfs.ramster -l TCP allow + */ + +/* for task_struct */ +#include <linux/sched.h> + +/* bits that are frequently given and infrequently matched in the low word */ +/* NOTE: If you add a flag, you need to also update masklog.c! */ +#define ML_TCP 0x0000000000000001ULL /* net cluster/tcp.c */ +#define ML_MSG 0x0000000000000002ULL /* net network messages */ +#define ML_SOCKET 0x0000000000000004ULL /* net socket lifetime */ +#define ML_HEARTBEAT 0x0000000000000008ULL /* hb all heartbeat tracking */ +#define ML_HB_BIO 0x0000000000000010ULL /* hb io tracing */ +#define ML_DLMFS 0x0000000000000020ULL /* dlm user dlmfs */ +#define ML_DLM 0x0000000000000040ULL /* dlm general debugging */ +#define ML_DLM_DOMAIN 0x0000000000000080ULL /* dlm domain debugging */ +#define ML_DLM_THREAD 0x0000000000000100ULL /* dlm domain thread */ +#define ML_DLM_MASTER 0x0000000000000200ULL /* dlm master functions */ +#define ML_DLM_RECOVERY 0x0000000000000400ULL /* dlm master functions */ +#define ML_DLM_GLUE 0x0000000000000800ULL /* ramster dlm glue layer */ +#define ML_VOTE 0x0000000000001000ULL /* ramster node messaging */ +#define ML_CONN 0x0000000000002000ULL /* net connection management */ +#define ML_QUORUM 0x0000000000004000ULL /* net connection quorum */ +#define ML_BASTS 0x0000000000008000ULL /* dlmglue asts and basts */ +#define ML_CLUSTER 0x0000000000010000ULL /* cluster stack */ + +/* bits that are infrequently given and frequently matched in the high word */ +#define ML_ERROR 0x1000000000000000ULL /* sent to KERN_ERR */ +#define ML_NOTICE 0x2000000000000000ULL /* setn to KERN_NOTICE */ +#define ML_KTHREAD 0x4000000000000000ULL /* kernel thread activity */ + +#define MLOG_INITIAL_AND_MASK (ML_ERROR|ML_NOTICE) +#ifndef MLOG_MASK_PREFIX +#define MLOG_MASK_PREFIX 0 +#endif + +/* + * When logging is disabled, force the bit test to 0 for anything other + * than errors and notices, allowing gcc to remove the code completely. + * When enabled, allow all masks. + */ +#if defined(CONFIG_RAMSTER_DEBUG_MASKLOG) +#define ML_ALLOWED_BITS (~0) +#else +#define ML_ALLOWED_BITS (ML_ERROR|ML_NOTICE) +#endif + +#define MLOG_MAX_BITS 64 + +struct mlog_bits { + unsigned long words[MLOG_MAX_BITS / BITS_PER_LONG]; +}; + +extern struct mlog_bits r2_mlog_and_bits, r2_mlog_not_bits; + +#if BITS_PER_LONG == 32 + +#define __mlog_test_u64(mask, bits) \ + ((u32)(mask & 0xffffffff) & bits.words[0] || \ + ((u64)(mask) >> 32) & bits.words[1]) +#define __mlog_set_u64(mask, bits) do { \ + bits.words[0] |= (u32)(mask & 0xffffffff); \ + bits.words[1] |= (u64)(mask) >> 32; \ +} while (0) +#define __mlog_clear_u64(mask, bits) do { \ + bits.words[0] &= ~((u32)(mask & 0xffffffff)); \ + bits.words[1] &= ~((u64)(mask) >> 32); \ +} while (0) +#define MLOG_BITS_RHS(mask) { \ + { \ + [0] = (u32)(mask & 0xffffffff), \ + [1] = (u64)(mask) >> 32, \ + } \ +} + +#else /* 32bit long above, 64bit long below */ + +#define __mlog_test_u64(mask, bits) ((mask) & bits.words[0]) +#define __mlog_set_u64(mask, bits) do { \ + bits.words[0] |= (mask); \ +} while (0) +#define __mlog_clear_u64(mask, bits) do { \ + bits.words[0] &= ~(mask); \ +} while (0) +#define MLOG_BITS_RHS(mask) { { (mask) } } + +#endif + +/* + * smp_processor_id() "helpfully" screams when called outside preemptible + * regions in current kernels. sles doesn't have the variants that don't + * scream. just do this instead of trying to guess which we're building + * against.. *sigh*. + */ +#define __mlog_cpu_guess ({ \ + unsigned long _cpu = get_cpu(); \ + put_cpu(); \ + _cpu; \ +}) + +/* In the following two macros, the whitespace after the ',' just + * before ##args is intentional. Otherwise, gcc 2.95 will eat the + * previous token if args expands to nothing. + */ +#define __mlog_printk(level, fmt, args...) \ + printk(level "(%s,%u,%lu):%s:%d " fmt, current->comm, \ + task_pid_nr(current), __mlog_cpu_guess, \ + __PRETTY_FUNCTION__, __LINE__ , ##args) + +#define mlog(mask, fmt, args...) do { \ + u64 __m = MLOG_MASK_PREFIX | (mask); \ + if ((__m & ML_ALLOWED_BITS) && \ + __mlog_test_u64(__m, r2_mlog_and_bits) && \ + !__mlog_test_u64(__m, r2_mlog_not_bits)) { \ + if (__m & ML_ERROR) \ + __mlog_printk(KERN_ERR, "ERROR: "fmt , ##args); \ + else if (__m & ML_NOTICE) \ + __mlog_printk(KERN_NOTICE, fmt , ##args); \ + else \ + __mlog_printk(KERN_INFO, fmt , ##args); \ + } \ +} while (0) + +#define mlog_errno(st) do { \ + int _st = (st); \ + if (_st != -ERESTARTSYS && _st != -EINTR && \ + _st != AOP_TRUNCATED_PAGE && _st != -ENOSPC) \ + mlog(ML_ERROR, "status = %lld\n", (long long)_st); \ +} while (0) + +#define mlog_bug_on_msg(cond, fmt, args...) do { \ + if (cond) { \ + mlog(ML_ERROR, "bug expression: " #cond "\n"); \ + mlog(ML_ERROR, fmt, ##args); \ + BUG(); \ + } \ +} while (0) + +#include <linux/kobject.h> +#include <linux/sysfs.h> +int r2_mlog_sys_init(struct kset *r2cb_subsys); +void r2_mlog_sys_shutdown(void); + +#endif /* R2CLUSTER_MASKLOG_H */ diff --git a/drivers/staging/ramster/ramster/nodemanager.c b/drivers/staging/ramster/ramster/nodemanager.c new file mode 100644 index 000000000000..c0f48158735d --- /dev/null +++ b/drivers/staging/ramster/ramster/nodemanager.c @@ -0,0 +1,995 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * Copyright (C) 2004, 2005, 2012 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#include <linux/slab.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/configfs.h> + +#include "tcp.h" +#include "nodemanager.h" +#include "heartbeat.h" +#include "masklog.h" + +/* for now we operate under the assertion that there can be only one + * cluster active at a time. Changing this will require trickling + * cluster references throughout where nodes are looked up */ +struct r2nm_cluster *r2nm_single_cluster; + +char *r2nm_fence_method_desc[R2NM_FENCE_METHODS] = { + "reset", /* R2NM_FENCE_RESET */ + "panic", /* R2NM_FENCE_PANIC */ +}; + +struct r2nm_node *r2nm_get_node_by_num(u8 node_num) +{ + struct r2nm_node *node = NULL; + + if (node_num >= R2NM_MAX_NODES || r2nm_single_cluster == NULL) + goto out; + + read_lock(&r2nm_single_cluster->cl_nodes_lock); + node = r2nm_single_cluster->cl_nodes[node_num]; + if (node) + config_item_get(&node->nd_item); + read_unlock(&r2nm_single_cluster->cl_nodes_lock); +out: + return node; +} +EXPORT_SYMBOL_GPL(r2nm_get_node_by_num); + +int r2nm_configured_node_map(unsigned long *map, unsigned bytes) +{ + struct r2nm_cluster *cluster = r2nm_single_cluster; + + BUG_ON(bytes < (sizeof(cluster->cl_nodes_bitmap))); + + if (cluster == NULL) + return -EINVAL; + + read_lock(&cluster->cl_nodes_lock); + memcpy(map, cluster->cl_nodes_bitmap, sizeof(cluster->cl_nodes_bitmap)); + read_unlock(&cluster->cl_nodes_lock); + + return 0; +} +EXPORT_SYMBOL_GPL(r2nm_configured_node_map); + +static struct r2nm_node *r2nm_node_ip_tree_lookup(struct r2nm_cluster *cluster, + __be32 ip_needle, + struct rb_node ***ret_p, + struct rb_node **ret_parent) +{ + struct rb_node **p = &cluster->cl_node_ip_tree.rb_node; + struct rb_node *parent = NULL; + struct r2nm_node *node, *ret = NULL; + + while (*p) { + int cmp; + + parent = *p; + node = rb_entry(parent, struct r2nm_node, nd_ip_node); + + cmp = memcmp(&ip_needle, &node->nd_ipv4_address, + sizeof(ip_needle)); + if (cmp < 0) + p = &(*p)->rb_left; + else if (cmp > 0) + p = &(*p)->rb_right; + else { + ret = node; + break; + } + } + + if (ret_p != NULL) + *ret_p = p; + if (ret_parent != NULL) + *ret_parent = parent; + + return ret; +} + +struct r2nm_node *r2nm_get_node_by_ip(__be32 addr) +{ + struct r2nm_node *node = NULL; + struct r2nm_cluster *cluster = r2nm_single_cluster; + + if (cluster == NULL) + goto out; + + read_lock(&cluster->cl_nodes_lock); + node = r2nm_node_ip_tree_lookup(cluster, addr, NULL, NULL); + if (node) + config_item_get(&node->nd_item); + read_unlock(&cluster->cl_nodes_lock); + +out: + return node; +} +EXPORT_SYMBOL_GPL(r2nm_get_node_by_ip); + +void r2nm_node_put(struct r2nm_node *node) +{ + config_item_put(&node->nd_item); +} +EXPORT_SYMBOL_GPL(r2nm_node_put); + +void r2nm_node_get(struct r2nm_node *node) +{ + config_item_get(&node->nd_item); +} +EXPORT_SYMBOL_GPL(r2nm_node_get); + +u8 r2nm_this_node(void) +{ + u8 node_num = R2NM_MAX_NODES; + + if (r2nm_single_cluster && r2nm_single_cluster->cl_has_local) + node_num = r2nm_single_cluster->cl_local_node; + + return node_num; +} +EXPORT_SYMBOL_GPL(r2nm_this_node); + +/* node configfs bits */ + +static struct r2nm_cluster *to_r2nm_cluster(struct config_item *item) +{ + return item ? + container_of(to_config_group(item), struct r2nm_cluster, + cl_group) + : NULL; +} + +static struct r2nm_node *to_r2nm_node(struct config_item *item) +{ + return item ? container_of(item, struct r2nm_node, nd_item) : NULL; +} + +static void r2nm_node_release(struct config_item *item) +{ + struct r2nm_node *node = to_r2nm_node(item); + kfree(node); +} + +static ssize_t r2nm_node_num_read(struct r2nm_node *node, char *page) +{ + return sprintf(page, "%d\n", node->nd_num); +} + +static struct r2nm_cluster *to_r2nm_cluster_from_node(struct r2nm_node *node) +{ + /* through the first node_set .parent + * mycluster/nodes/mynode == r2nm_cluster->r2nm_node_group->r2nm_node */ + return to_r2nm_cluster(node->nd_item.ci_parent->ci_parent); +} + +enum { + R2NM_NODE_ATTR_NUM = 0, + R2NM_NODE_ATTR_PORT, + R2NM_NODE_ATTR_ADDRESS, + R2NM_NODE_ATTR_LOCAL, +}; + +static ssize_t r2nm_node_num_write(struct r2nm_node *node, const char *page, + size_t count) +{ + struct r2nm_cluster *cluster = to_r2nm_cluster_from_node(node); + unsigned long tmp; + char *p = (char *)page; + int err; + + err = kstrtoul(p, 10, &tmp); + if (err) + return err; + + if (tmp >= R2NM_MAX_NODES) + return -ERANGE; + + /* once we're in the cl_nodes tree networking can look us up by + * node number and try to use our address and port attributes + * to connect to this node.. make sure that they've been set + * before writing the node attribute? */ + if (!test_bit(R2NM_NODE_ATTR_ADDRESS, &node->nd_set_attributes) || + !test_bit(R2NM_NODE_ATTR_PORT, &node->nd_set_attributes)) + return -EINVAL; /* XXX */ + + write_lock(&cluster->cl_nodes_lock); + if (cluster->cl_nodes[tmp]) + p = NULL; + else { + cluster->cl_nodes[tmp] = node; + node->nd_num = tmp; + set_bit(tmp, cluster->cl_nodes_bitmap); + } + write_unlock(&cluster->cl_nodes_lock); + if (p == NULL) + return -EEXIST; + + return count; +} +static ssize_t r2nm_node_ipv4_port_read(struct r2nm_node *node, char *page) +{ + return sprintf(page, "%u\n", ntohs(node->nd_ipv4_port)); +} + +static ssize_t r2nm_node_ipv4_port_write(struct r2nm_node *node, + const char *page, size_t count) +{ + unsigned long tmp; + char *p = (char *)page; + int err; + + err = kstrtoul(p, 10, &tmp); + if (err) + return err; + + if (tmp == 0) + return -EINVAL; + if (tmp >= (u16)-1) + return -ERANGE; + + node->nd_ipv4_port = htons(tmp); + + return count; +} + +static ssize_t r2nm_node_ipv4_address_read(struct r2nm_node *node, char *page) +{ + return sprintf(page, "%pI4\n", &node->nd_ipv4_address); +} + +static ssize_t r2nm_node_ipv4_address_write(struct r2nm_node *node, + const char *page, + size_t count) +{ + struct r2nm_cluster *cluster = to_r2nm_cluster_from_node(node); + int ret, i; + struct rb_node **p, *parent; + unsigned int octets[4]; + __be32 ipv4_addr = 0; + + ret = sscanf(page, "%3u.%3u.%3u.%3u", &octets[3], &octets[2], + &octets[1], &octets[0]); + if (ret != 4) + return -EINVAL; + + for (i = 0; i < ARRAY_SIZE(octets); i++) { + if (octets[i] > 255) + return -ERANGE; + be32_add_cpu(&ipv4_addr, octets[i] << (i * 8)); + } + + ret = 0; + write_lock(&cluster->cl_nodes_lock); + if (r2nm_node_ip_tree_lookup(cluster, ipv4_addr, &p, &parent)) + ret = -EEXIST; + else { + rb_link_node(&node->nd_ip_node, parent, p); + rb_insert_color(&node->nd_ip_node, &cluster->cl_node_ip_tree); + } + write_unlock(&cluster->cl_nodes_lock); + if (ret) + return ret; + + memcpy(&node->nd_ipv4_address, &ipv4_addr, sizeof(ipv4_addr)); + + return count; +} + +static ssize_t r2nm_node_local_read(struct r2nm_node *node, char *page) +{ + return sprintf(page, "%d\n", node->nd_local); +} + +static ssize_t r2nm_node_local_write(struct r2nm_node *node, const char *page, + size_t count) +{ + struct r2nm_cluster *cluster = to_r2nm_cluster_from_node(node); + unsigned long tmp; + char *p = (char *)page; + ssize_t ret; + int err; + + err = kstrtoul(p, 10, &tmp); + if (err) + return err; + + tmp = !!tmp; /* boolean of whether this node wants to be local */ + + /* setting local turns on networking rx for now so we require having + * set everything else first */ + if (!test_bit(R2NM_NODE_ATTR_ADDRESS, &node->nd_set_attributes) || + !test_bit(R2NM_NODE_ATTR_NUM, &node->nd_set_attributes) || + !test_bit(R2NM_NODE_ATTR_PORT, &node->nd_set_attributes)) + return -EINVAL; /* XXX */ + + /* the only failure case is trying to set a new local node + * when a different one is already set */ + if (tmp && tmp == cluster->cl_has_local && + cluster->cl_local_node != node->nd_num) + return -EBUSY; + + /* bring up the rx thread if we're setting the new local node. */ + if (tmp && !cluster->cl_has_local) { + ret = r2net_start_listening(node); + if (ret) + return ret; + } + + if (!tmp && cluster->cl_has_local && + cluster->cl_local_node == node->nd_num) { + r2net_stop_listening(node); + cluster->cl_local_node = R2NM_INVALID_NODE_NUM; + } + + node->nd_local = tmp; + if (node->nd_local) { + cluster->cl_has_local = tmp; + cluster->cl_local_node = node->nd_num; + } + + return count; +} + +struct r2nm_node_attribute { + struct configfs_attribute attr; + ssize_t (*show)(struct r2nm_node *, char *); + ssize_t (*store)(struct r2nm_node *, const char *, size_t); +}; + +static struct r2nm_node_attribute r2nm_node_attr_num = { + .attr = { .ca_owner = THIS_MODULE, + .ca_name = "num", + .ca_mode = S_IRUGO | S_IWUSR }, + .show = r2nm_node_num_read, + .store = r2nm_node_num_write, +}; + +static struct r2nm_node_attribute r2nm_node_attr_ipv4_port = { + .attr = { .ca_owner = THIS_MODULE, + .ca_name = "ipv4_port", + .ca_mode = S_IRUGO | S_IWUSR }, + .show = r2nm_node_ipv4_port_read, + .store = r2nm_node_ipv4_port_write, +}; + +static struct r2nm_node_attribute r2nm_node_attr_ipv4_address = { + .attr = { .ca_owner = THIS_MODULE, + .ca_name = "ipv4_address", + .ca_mode = S_IRUGO | S_IWUSR }, + .show = r2nm_node_ipv4_address_read, + .store = r2nm_node_ipv4_address_write, +}; + +static struct r2nm_node_attribute r2nm_node_attr_local = { + .attr = { .ca_owner = THIS_MODULE, + .ca_name = "local", + .ca_mode = S_IRUGO | S_IWUSR }, + .show = r2nm_node_local_read, + .store = r2nm_node_local_write, +}; + +static struct configfs_attribute *r2nm_node_attrs[] = { + [R2NM_NODE_ATTR_NUM] = &r2nm_node_attr_num.attr, + [R2NM_NODE_ATTR_PORT] = &r2nm_node_attr_ipv4_port.attr, + [R2NM_NODE_ATTR_ADDRESS] = &r2nm_node_attr_ipv4_address.attr, + [R2NM_NODE_ATTR_LOCAL] = &r2nm_node_attr_local.attr, + NULL, +}; + +static int r2nm_attr_index(struct configfs_attribute *attr) +{ + int i; + for (i = 0; i < ARRAY_SIZE(r2nm_node_attrs); i++) { + if (attr == r2nm_node_attrs[i]) + return i; + } + BUG(); + return 0; +} + +static ssize_t r2nm_node_show(struct config_item *item, + struct configfs_attribute *attr, + char *page) +{ + struct r2nm_node *node = to_r2nm_node(item); + struct r2nm_node_attribute *r2nm_node_attr = + container_of(attr, struct r2nm_node_attribute, attr); + ssize_t ret = 0; + + if (r2nm_node_attr->show) + ret = r2nm_node_attr->show(node, page); + return ret; +} + +static ssize_t r2nm_node_store(struct config_item *item, + struct configfs_attribute *attr, + const char *page, size_t count) +{ + struct r2nm_node *node = to_r2nm_node(item); + struct r2nm_node_attribute *r2nm_node_attr = + container_of(attr, struct r2nm_node_attribute, attr); + ssize_t ret; + int attr_index = r2nm_attr_index(attr); + + if (r2nm_node_attr->store == NULL) { + ret = -EINVAL; + goto out; + } + + if (test_bit(attr_index, &node->nd_set_attributes)) + return -EBUSY; + + ret = r2nm_node_attr->store(node, page, count); + if (ret < count) + goto out; + + set_bit(attr_index, &node->nd_set_attributes); +out: + return ret; +} + +static struct configfs_item_operations r2nm_node_item_ops = { + .release = r2nm_node_release, + .show_attribute = r2nm_node_show, + .store_attribute = r2nm_node_store, +}; + +static struct config_item_type r2nm_node_type = { + .ct_item_ops = &r2nm_node_item_ops, + .ct_attrs = r2nm_node_attrs, + .ct_owner = THIS_MODULE, +}; + +/* node set */ + +struct r2nm_node_group { + struct config_group ns_group; + /* some stuff? */ +}; + +#if 0 +static struct r2nm_node_group *to_r2nm_node_group(struct config_group *group) +{ + return group ? + container_of(group, struct r2nm_node_group, ns_group) + : NULL; +} +#endif + +struct r2nm_cluster_attribute { + struct configfs_attribute attr; + ssize_t (*show)(struct r2nm_cluster *, char *); + ssize_t (*store)(struct r2nm_cluster *, const char *, size_t); +}; + +static ssize_t r2nm_cluster_attr_write(const char *page, ssize_t count, + unsigned int *val) +{ + unsigned long tmp; + char *p = (char *)page; + int err; + + err = kstrtoul(p, 10, &tmp); + if (err) + return err; + + if (tmp == 0) + return -EINVAL; + if (tmp >= (u32)-1) + return -ERANGE; + + *val = tmp; + + return count; +} + +static ssize_t r2nm_cluster_attr_idle_timeout_ms_read( + struct r2nm_cluster *cluster, char *page) +{ + return sprintf(page, "%u\n", cluster->cl_idle_timeout_ms); +} + +static ssize_t r2nm_cluster_attr_idle_timeout_ms_write( + struct r2nm_cluster *cluster, const char *page, size_t count) +{ + ssize_t ret; + unsigned int val = 0; + + ret = r2nm_cluster_attr_write(page, count, &val); + + if (ret > 0) { + if (cluster->cl_idle_timeout_ms != val + && r2net_num_connected_peers()) { + mlog(ML_NOTICE, + "r2net: cannot change idle timeout after " + "the first peer has agreed to it." + " %d connected peers\n", + r2net_num_connected_peers()); + ret = -EINVAL; + } else if (val <= cluster->cl_keepalive_delay_ms) { + mlog(ML_NOTICE, + "r2net: idle timeout must be larger " + "than keepalive delay\n"); + ret = -EINVAL; + } else { + cluster->cl_idle_timeout_ms = val; + } + } + + return ret; +} + +static ssize_t r2nm_cluster_attr_keepalive_delay_ms_read( + struct r2nm_cluster *cluster, char *page) +{ + return sprintf(page, "%u\n", cluster->cl_keepalive_delay_ms); +} + +static ssize_t r2nm_cluster_attr_keepalive_delay_ms_write( + struct r2nm_cluster *cluster, const char *page, size_t count) +{ + ssize_t ret; + unsigned int val = 0; + + ret = r2nm_cluster_attr_write(page, count, &val); + + if (ret > 0) { + if (cluster->cl_keepalive_delay_ms != val + && r2net_num_connected_peers()) { + mlog(ML_NOTICE, + "r2net: cannot change keepalive delay after" + " the first peer has agreed to it." + " %d connected peers\n", + r2net_num_connected_peers()); + ret = -EINVAL; + } else if (val >= cluster->cl_idle_timeout_ms) { + mlog(ML_NOTICE, + "r2net: keepalive delay must be " + "smaller than idle timeout\n"); + ret = -EINVAL; + } else { + cluster->cl_keepalive_delay_ms = val; + } + } + + return ret; +} + +static ssize_t r2nm_cluster_attr_reconnect_delay_ms_read( + struct r2nm_cluster *cluster, char *page) +{ + return sprintf(page, "%u\n", cluster->cl_reconnect_delay_ms); +} + +static ssize_t r2nm_cluster_attr_reconnect_delay_ms_write( + struct r2nm_cluster *cluster, const char *page, size_t count) +{ + return r2nm_cluster_attr_write(page, count, + &cluster->cl_reconnect_delay_ms); +} + +static ssize_t r2nm_cluster_attr_fence_method_read( + struct r2nm_cluster *cluster, char *page) +{ + ssize_t ret = 0; + + if (cluster) + ret = sprintf(page, "%s\n", + r2nm_fence_method_desc[cluster->cl_fence_method]); + return ret; +} + +static ssize_t r2nm_cluster_attr_fence_method_write( + struct r2nm_cluster *cluster, const char *page, size_t count) +{ + unsigned int i; + + if (page[count - 1] != '\n') + goto bail; + + for (i = 0; i < R2NM_FENCE_METHODS; ++i) { + if (count != strlen(r2nm_fence_method_desc[i]) + 1) + continue; + if (strncasecmp(page, r2nm_fence_method_desc[i], count - 1)) + continue; + if (cluster->cl_fence_method != i) { + pr_info("ramster: Changing fence method to %s\n", + r2nm_fence_method_desc[i]); + cluster->cl_fence_method = i; + } + return count; + } + +bail: + return -EINVAL; +} + +static struct r2nm_cluster_attribute r2nm_cluster_attr_idle_timeout_ms = { + .attr = { .ca_owner = THIS_MODULE, + .ca_name = "idle_timeout_ms", + .ca_mode = S_IRUGO | S_IWUSR }, + .show = r2nm_cluster_attr_idle_timeout_ms_read, + .store = r2nm_cluster_attr_idle_timeout_ms_write, +}; + +static struct r2nm_cluster_attribute r2nm_cluster_attr_keepalive_delay_ms = { + .attr = { .ca_owner = THIS_MODULE, + .ca_name = "keepalive_delay_ms", + .ca_mode = S_IRUGO | S_IWUSR }, + .show = r2nm_cluster_attr_keepalive_delay_ms_read, + .store = r2nm_cluster_attr_keepalive_delay_ms_write, +}; + +static struct r2nm_cluster_attribute r2nm_cluster_attr_reconnect_delay_ms = { + .attr = { .ca_owner = THIS_MODULE, + .ca_name = "reconnect_delay_ms", + .ca_mode = S_IRUGO | S_IWUSR }, + .show = r2nm_cluster_attr_reconnect_delay_ms_read, + .store = r2nm_cluster_attr_reconnect_delay_ms_write, +}; + +static struct r2nm_cluster_attribute r2nm_cluster_attr_fence_method = { + .attr = { .ca_owner = THIS_MODULE, + .ca_name = "fence_method", + .ca_mode = S_IRUGO | S_IWUSR }, + .show = r2nm_cluster_attr_fence_method_read, + .store = r2nm_cluster_attr_fence_method_write, +}; + +static struct configfs_attribute *r2nm_cluster_attrs[] = { + &r2nm_cluster_attr_idle_timeout_ms.attr, + &r2nm_cluster_attr_keepalive_delay_ms.attr, + &r2nm_cluster_attr_reconnect_delay_ms.attr, + &r2nm_cluster_attr_fence_method.attr, + NULL, +}; +static ssize_t r2nm_cluster_show(struct config_item *item, + struct configfs_attribute *attr, + char *page) +{ + struct r2nm_cluster *cluster = to_r2nm_cluster(item); + struct r2nm_cluster_attribute *r2nm_cluster_attr = + container_of(attr, struct r2nm_cluster_attribute, attr); + ssize_t ret = 0; + + if (r2nm_cluster_attr->show) + ret = r2nm_cluster_attr->show(cluster, page); + return ret; +} + +static ssize_t r2nm_cluster_store(struct config_item *item, + struct configfs_attribute *attr, + const char *page, size_t count) +{ + struct r2nm_cluster *cluster = to_r2nm_cluster(item); + struct r2nm_cluster_attribute *r2nm_cluster_attr = + container_of(attr, struct r2nm_cluster_attribute, attr); + ssize_t ret; + + if (r2nm_cluster_attr->store == NULL) { + ret = -EINVAL; + goto out; + } + + ret = r2nm_cluster_attr->store(cluster, page, count); + if (ret < count) + goto out; +out: + return ret; +} + +static struct config_item *r2nm_node_group_make_item(struct config_group *group, + const char *name) +{ + struct r2nm_node *node = NULL; + + if (strlen(name) > R2NM_MAX_NAME_LEN) + return ERR_PTR(-ENAMETOOLONG); + + node = kzalloc(sizeof(struct r2nm_node), GFP_KERNEL); + if (node == NULL) + return ERR_PTR(-ENOMEM); + + strcpy(node->nd_name, name); /* use item.ci_namebuf instead? */ + config_item_init_type_name(&node->nd_item, name, &r2nm_node_type); + spin_lock_init(&node->nd_lock); + + mlog(ML_CLUSTER, "r2nm: Registering node %s\n", name); + + return &node->nd_item; +} + +static void r2nm_node_group_drop_item(struct config_group *group, + struct config_item *item) +{ + struct r2nm_node *node = to_r2nm_node(item); + struct r2nm_cluster *cluster = + to_r2nm_cluster(group->cg_item.ci_parent); + + r2net_disconnect_node(node); + + if (cluster->cl_has_local && + (cluster->cl_local_node == node->nd_num)) { + cluster->cl_has_local = 0; + cluster->cl_local_node = R2NM_INVALID_NODE_NUM; + r2net_stop_listening(node); + } + + /* XXX call into net to stop this node from trading messages */ + + write_lock(&cluster->cl_nodes_lock); + + /* XXX sloppy */ + if (node->nd_ipv4_address) + rb_erase(&node->nd_ip_node, &cluster->cl_node_ip_tree); + + /* nd_num might be 0 if the node number hasn't been set.. */ + if (cluster->cl_nodes[node->nd_num] == node) { + cluster->cl_nodes[node->nd_num] = NULL; + clear_bit(node->nd_num, cluster->cl_nodes_bitmap); + } + write_unlock(&cluster->cl_nodes_lock); + + mlog(ML_CLUSTER, "r2nm: Unregistered node %s\n", + config_item_name(&node->nd_item)); + + config_item_put(item); +} + +static struct configfs_group_operations r2nm_node_group_group_ops = { + .make_item = r2nm_node_group_make_item, + .drop_item = r2nm_node_group_drop_item, +}; + +static struct config_item_type r2nm_node_group_type = { + .ct_group_ops = &r2nm_node_group_group_ops, + .ct_owner = THIS_MODULE, +}; + +/* cluster */ + +static void r2nm_cluster_release(struct config_item *item) +{ + struct r2nm_cluster *cluster = to_r2nm_cluster(item); + + kfree(cluster->cl_group.default_groups); + kfree(cluster); +} + +static struct configfs_item_operations r2nm_cluster_item_ops = { + .release = r2nm_cluster_release, + .show_attribute = r2nm_cluster_show, + .store_attribute = r2nm_cluster_store, +}; + +static struct config_item_type r2nm_cluster_type = { + .ct_item_ops = &r2nm_cluster_item_ops, + .ct_attrs = r2nm_cluster_attrs, + .ct_owner = THIS_MODULE, +}; + +/* cluster set */ + +struct r2nm_cluster_group { + struct configfs_subsystem cs_subsys; + /* some stuff? */ +}; + +#if 0 +static struct r2nm_cluster_group * +to_r2nm_cluster_group(struct config_group *group) +{ + return group ? + container_of(to_configfs_subsystem(group), + struct r2nm_cluster_group, cs_subsys) + : NULL; +} +#endif + +static struct config_group * +r2nm_cluster_group_make_group(struct config_group *group, + const char *name) +{ + struct r2nm_cluster *cluster = NULL; + struct r2nm_node_group *ns = NULL; + struct config_group *r2hb_group = NULL, *ret = NULL; + void *defs = NULL; + + /* this runs under the parent dir's i_mutex; there can be only + * one caller in here at a time */ + if (r2nm_single_cluster) + return ERR_PTR(-ENOSPC); + + cluster = kzalloc(sizeof(struct r2nm_cluster), GFP_KERNEL); + ns = kzalloc(sizeof(struct r2nm_node_group), GFP_KERNEL); + defs = kcalloc(3, sizeof(struct config_group *), GFP_KERNEL); + r2hb_group = r2hb_alloc_hb_set(); + if (cluster == NULL || ns == NULL || r2hb_group == NULL || defs == NULL) + goto out; + + config_group_init_type_name(&cluster->cl_group, name, + &r2nm_cluster_type); + config_group_init_type_name(&ns->ns_group, "node", + &r2nm_node_group_type); + + cluster->cl_group.default_groups = defs; + cluster->cl_group.default_groups[0] = &ns->ns_group; + cluster->cl_group.default_groups[1] = r2hb_group; + cluster->cl_group.default_groups[2] = NULL; + rwlock_init(&cluster->cl_nodes_lock); + cluster->cl_node_ip_tree = RB_ROOT; + cluster->cl_reconnect_delay_ms = R2NET_RECONNECT_DELAY_MS_DEFAULT; + cluster->cl_idle_timeout_ms = R2NET_IDLE_TIMEOUT_MS_DEFAULT; + cluster->cl_keepalive_delay_ms = R2NET_KEEPALIVE_DELAY_MS_DEFAULT; + cluster->cl_fence_method = R2NM_FENCE_RESET; + + ret = &cluster->cl_group; + r2nm_single_cluster = cluster; + +out: + if (ret == NULL) { + kfree(cluster); + kfree(ns); + r2hb_free_hb_set(r2hb_group); + kfree(defs); + ret = ERR_PTR(-ENOMEM); + } + + return ret; +} + +static void r2nm_cluster_group_drop_item(struct config_group *group, + struct config_item *item) +{ + struct r2nm_cluster *cluster = to_r2nm_cluster(item); + int i; + struct config_item *killme; + + BUG_ON(r2nm_single_cluster != cluster); + r2nm_single_cluster = NULL; + + for (i = 0; cluster->cl_group.default_groups[i]; i++) { + killme = &cluster->cl_group.default_groups[i]->cg_item; + cluster->cl_group.default_groups[i] = NULL; + config_item_put(killme); + } + + config_item_put(item); +} + +static struct configfs_group_operations r2nm_cluster_group_group_ops = { + .make_group = r2nm_cluster_group_make_group, + .drop_item = r2nm_cluster_group_drop_item, +}; + +static struct config_item_type r2nm_cluster_group_type = { + .ct_group_ops = &r2nm_cluster_group_group_ops, + .ct_owner = THIS_MODULE, +}; + +static struct r2nm_cluster_group r2nm_cluster_group = { + .cs_subsys = { + .su_group = { + .cg_item = { + .ci_namebuf = "cluster", + .ci_type = &r2nm_cluster_group_type, + }, + }, + }, +}; + +int r2nm_depend_item(struct config_item *item) +{ + return configfs_depend_item(&r2nm_cluster_group.cs_subsys, item); +} + +void r2nm_undepend_item(struct config_item *item) +{ + configfs_undepend_item(&r2nm_cluster_group.cs_subsys, item); +} + +int r2nm_depend_this_node(void) +{ + int ret = 0; + struct r2nm_node *local_node; + + local_node = r2nm_get_node_by_num(r2nm_this_node()); + if (!local_node) { + ret = -EINVAL; + goto out; + } + + ret = r2nm_depend_item(&local_node->nd_item); + r2nm_node_put(local_node); + +out: + return ret; +} + +void r2nm_undepend_this_node(void) +{ + struct r2nm_node *local_node; + + local_node = r2nm_get_node_by_num(r2nm_this_node()); + BUG_ON(!local_node); + + r2nm_undepend_item(&local_node->nd_item); + r2nm_node_put(local_node); +} + + +static void __exit exit_r2nm(void) +{ + /* XXX sync with hb callbacks and shut down hb? */ + r2net_unregister_hb_callbacks(); + configfs_unregister_subsystem(&r2nm_cluster_group.cs_subsys); + + r2net_exit(); + r2hb_exit(); +} + +static int __init init_r2nm(void) +{ + int ret = -1; + + ret = r2hb_init(); + if (ret) + goto out; + + ret = r2net_init(); + if (ret) + goto out_r2hb; + + ret = r2net_register_hb_callbacks(); + if (ret) + goto out_r2net; + + config_group_init(&r2nm_cluster_group.cs_subsys.su_group); + mutex_init(&r2nm_cluster_group.cs_subsys.su_mutex); + ret = configfs_register_subsystem(&r2nm_cluster_group.cs_subsys); + if (ret) { + pr_err("nodemanager: Registration returned %d\n", ret); + goto out_callbacks; + } + + if (!ret) + goto out; + + configfs_unregister_subsystem(&r2nm_cluster_group.cs_subsys); +out_callbacks: + r2net_unregister_hb_callbacks(); +out_r2net: + r2net_exit(); +out_r2hb: + r2hb_exit(); +out: + return ret; +} + +MODULE_AUTHOR("Oracle"); +MODULE_LICENSE("GPL"); + +/* module_init(init_r2nm) */ +late_initcall(init_r2nm); +/* module_exit(exit_r2nm) */ diff --git a/drivers/staging/ramster/ramster/nodemanager.h b/drivers/staging/ramster/ramster/nodemanager.h new file mode 100644 index 000000000000..41a04df5842c --- /dev/null +++ b/drivers/staging/ramster/ramster/nodemanager.h @@ -0,0 +1,88 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * nodemanager.h + * + * Function prototypes + * + * Copyright (C) 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + * + */ + +#ifndef R2CLUSTER_NODEMANAGER_H +#define R2CLUSTER_NODEMANAGER_H + +#include "ramster_nodemanager.h" + +/* This totally doesn't belong here. */ +#include <linux/configfs.h> +#include <linux/rbtree.h> + +enum r2nm_fence_method { + R2NM_FENCE_RESET = 0, + R2NM_FENCE_PANIC, + R2NM_FENCE_METHODS, /* Number of fence methods */ +}; + +struct r2nm_node { + spinlock_t nd_lock; + struct config_item nd_item; + char nd_name[R2NM_MAX_NAME_LEN+1]; /* replace? */ + __u8 nd_num; + /* only one address per node, as attributes, for now. */ + __be32 nd_ipv4_address; + __be16 nd_ipv4_port; + struct rb_node nd_ip_node; + /* there can be only one local node for now */ + int nd_local; + + unsigned long nd_set_attributes; +}; + +struct r2nm_cluster { + struct config_group cl_group; + unsigned cl_has_local:1; + u8 cl_local_node; + rwlock_t cl_nodes_lock; + struct r2nm_node *cl_nodes[R2NM_MAX_NODES]; + struct rb_root cl_node_ip_tree; + unsigned int cl_idle_timeout_ms; + unsigned int cl_keepalive_delay_ms; + unsigned int cl_reconnect_delay_ms; + enum r2nm_fence_method cl_fence_method; + + /* part of a hack for disk bitmap.. will go eventually. - zab */ + unsigned long cl_nodes_bitmap[BITS_TO_LONGS(R2NM_MAX_NODES)]; +}; + +extern struct r2nm_cluster *r2nm_single_cluster; + +u8 r2nm_this_node(void); + +int r2nm_configured_node_map(unsigned long *map, unsigned bytes); +struct r2nm_node *r2nm_get_node_by_num(u8 node_num); +struct r2nm_node *r2nm_get_node_by_ip(__be32 addr); +void r2nm_node_get(struct r2nm_node *node); +void r2nm_node_put(struct r2nm_node *node); + +int r2nm_depend_item(struct config_item *item); +void r2nm_undepend_item(struct config_item *item); +int r2nm_depend_this_node(void); +void r2nm_undepend_this_node(void); + +#endif /* R2CLUSTER_NODEMANAGER_H */ diff --git a/drivers/staging/ramster/ramster/r2net.c b/drivers/staging/ramster/ramster/r2net.c new file mode 100644 index 000000000000..34818dc65612 --- /dev/null +++ b/drivers/staging/ramster/ramster/r2net.c @@ -0,0 +1,414 @@ +/* + * r2net.c + * + * Copyright (c) 2011-2012, Dan Magenheimer, Oracle Corp. + * + * Ramster_r2net provides an interface between zcache and r2net. + * + * FIXME: support more than two nodes + */ + +#include <linux/list.h> +#include "tcp.h" +#include "nodemanager.h" +#include "../tmem.h" +#include "../zcache.h" +#include "ramster.h" + +#define RAMSTER_TESTING + +#define RMSTR_KEY 0x77347734 + +enum { + RMSTR_TMEM_PUT_EPH = 100, + RMSTR_TMEM_PUT_PERS, + RMSTR_TMEM_ASYNC_GET_REQUEST, + RMSTR_TMEM_ASYNC_GET_AND_FREE_REQUEST, + RMSTR_TMEM_ASYNC_GET_REPLY, + RMSTR_TMEM_FLUSH, + RMSTR_TMEM_FLOBJ, + RMSTR_TMEM_DESTROY_POOL, +}; + +#define RMSTR_R2NET_MAX_LEN \ + (R2NET_MAX_PAYLOAD_BYTES - sizeof(struct tmem_xhandle)) + +#include "tcp_internal.h" + +static struct r2nm_node *r2net_target_node; +static int r2net_target_nodenum; + +int r2net_remote_target_node_set(int node_num) +{ + int ret = -1; + + r2net_target_node = r2nm_get_node_by_num(node_num); + if (r2net_target_node != NULL) { + r2net_target_nodenum = node_num; + r2nm_node_put(r2net_target_node); + ret = 0; + } + return ret; +} + +/* FIXME following buffer should be per-cpu, protected by preempt_disable */ +static char ramster_async_get_buf[R2NET_MAX_PAYLOAD_BYTES]; + +static int ramster_remote_async_get_request_handler(struct r2net_msg *msg, + u32 len, void *data, void **ret_data) +{ + char *pdata; + struct tmem_xhandle xh; + int found; + size_t size = RMSTR_R2NET_MAX_LEN; + u16 msgtype = be16_to_cpu(msg->msg_type); + bool get_and_free = (msgtype == RMSTR_TMEM_ASYNC_GET_AND_FREE_REQUEST); + unsigned long flags; + + xh = *(struct tmem_xhandle *)msg->buf; + if (xh.xh_data_size > RMSTR_R2NET_MAX_LEN) + BUG(); + pdata = ramster_async_get_buf; + *(struct tmem_xhandle *)pdata = xh; + pdata += sizeof(struct tmem_xhandle); + local_irq_save(flags); + found = zcache_get_page(xh.client_id, xh.pool_id, &xh.oid, xh.index, + pdata, &size, true, get_and_free ? 1 : -1); + local_irq_restore(flags); + if (found < 0) { + /* a zero size indicates the get failed */ + size = 0; + } + if (size > RMSTR_R2NET_MAX_LEN) + BUG(); + *ret_data = pdata - sizeof(struct tmem_xhandle); + /* now make caller (r2net_process_message) handle specially */ + r2net_force_data_magic(msg, RMSTR_TMEM_ASYNC_GET_REPLY, RMSTR_KEY); + return size + sizeof(struct tmem_xhandle); +} + +static int ramster_remote_async_get_reply_handler(struct r2net_msg *msg, + u32 len, void *data, void **ret_data) +{ + char *in = (char *)msg->buf; + int datalen = len - sizeof(struct r2net_msg); + int ret = -1; + struct tmem_xhandle *xh = (struct tmem_xhandle *)in; + + in += sizeof(struct tmem_xhandle); + datalen -= sizeof(struct tmem_xhandle); + BUG_ON(datalen < 0 || datalen > PAGE_SIZE); + ret = ramster_localify(xh->pool_id, &xh->oid, xh->index, + in, datalen, xh->extra); +#ifdef RAMSTER_TESTING + if (ret == -EEXIST) + pr_err("TESTING ArrgREP, aborted overwrite on racy put\n"); +#endif + return ret; +} + +int ramster_remote_put_handler(struct r2net_msg *msg, + u32 len, void *data, void **ret_data) +{ + struct tmem_xhandle *xh; + char *p = (char *)msg->buf; + int datalen = len - sizeof(struct r2net_msg) - + sizeof(struct tmem_xhandle); + u16 msgtype = be16_to_cpu(msg->msg_type); + bool ephemeral = (msgtype == RMSTR_TMEM_PUT_EPH); + unsigned long flags; + int ret; + + xh = (struct tmem_xhandle *)p; + p += sizeof(struct tmem_xhandle); + zcache_autocreate_pool(xh->client_id, xh->pool_id, ephemeral); + local_irq_save(flags); + ret = zcache_put_page(xh->client_id, xh->pool_id, &xh->oid, xh->index, + p, datalen, true, ephemeral); + local_irq_restore(flags); + return ret; +} + +int ramster_remote_flush_handler(struct r2net_msg *msg, + u32 len, void *data, void **ret_data) +{ + struct tmem_xhandle *xh; + char *p = (char *)msg->buf; + + xh = (struct tmem_xhandle *)p; + p += sizeof(struct tmem_xhandle); + (void)zcache_flush_page(xh->client_id, xh->pool_id, + &xh->oid, xh->index); + return 0; +} + +int ramster_remote_flobj_handler(struct r2net_msg *msg, + u32 len, void *data, void **ret_data) +{ + struct tmem_xhandle *xh; + char *p = (char *)msg->buf; + + xh = (struct tmem_xhandle *)p; + p += sizeof(struct tmem_xhandle); + (void)zcache_flush_object(xh->client_id, xh->pool_id, &xh->oid); + return 0; +} + +int r2net_remote_async_get(struct tmem_xhandle *xh, bool free, int remotenode, + size_t expect_size, uint8_t expect_cksum, + void *extra) +{ + int nodenum, ret = -1, status; + struct r2nm_node *node = NULL; + struct kvec vec[1]; + size_t veclen = 1; + u32 msg_type; + struct r2net_node *nn; + + node = r2nm_get_node_by_num(remotenode); + if (node == NULL) + goto out; + xh->client_id = r2nm_this_node(); /* which node is getting */ + xh->xh_data_cksum = expect_cksum; + xh->xh_data_size = expect_size; + xh->extra = extra; + vec[0].iov_len = sizeof(*xh); + vec[0].iov_base = xh; + + node = r2net_target_node; + if (!node) + goto out; + + nodenum = r2net_target_nodenum; + + r2nm_node_get(node); + nn = r2net_nn_from_num(nodenum); + if (nn->nn_persistent_error || !nn->nn_sc_valid) { + ret = -ENOTCONN; + r2nm_node_put(node); + goto out; + } + + if (free) + msg_type = RMSTR_TMEM_ASYNC_GET_AND_FREE_REQUEST; + else + msg_type = RMSTR_TMEM_ASYNC_GET_REQUEST; + ret = r2net_send_message_vec(msg_type, RMSTR_KEY, + vec, veclen, remotenode, &status); + r2nm_node_put(node); + if (ret < 0) { + if (ret == -ENOTCONN || ret == -EHOSTDOWN) + goto out; + if (ret == -EAGAIN) + goto out; + /* FIXME handle bad message possibilities here? */ + pr_err("UNTESTED ret<0 in ramster_remote_async_get: ret=%d\n", + ret); + } + ret = status; +out: + return ret; +} + +#ifdef RAMSTER_TESTING +/* leave me here to see if it catches a weird crash */ +static void ramster_check_irq_counts(void) +{ + static int last_hardirq_cnt, last_softirq_cnt, last_preempt_cnt; + int cur_hardirq_cnt, cur_softirq_cnt, cur_preempt_cnt; + + cur_hardirq_cnt = hardirq_count() >> HARDIRQ_SHIFT; + if (cur_hardirq_cnt > last_hardirq_cnt) { + last_hardirq_cnt = cur_hardirq_cnt; + if (!(last_hardirq_cnt&(last_hardirq_cnt-1))) + pr_err("RAMSTER TESTING RRP hardirq_count=%d\n", + last_hardirq_cnt); + } + cur_softirq_cnt = softirq_count() >> SOFTIRQ_SHIFT; + if (cur_softirq_cnt > last_softirq_cnt) { + last_softirq_cnt = cur_softirq_cnt; + if (!(last_softirq_cnt&(last_softirq_cnt-1))) + pr_err("RAMSTER TESTING RRP softirq_count=%d\n", + last_softirq_cnt); + } + cur_preempt_cnt = preempt_count() & PREEMPT_MASK; + if (cur_preempt_cnt > last_preempt_cnt) { + last_preempt_cnt = cur_preempt_cnt; + if (!(last_preempt_cnt&(last_preempt_cnt-1))) + pr_err("RAMSTER TESTING RRP preempt_count=%d\n", + last_preempt_cnt); + } +} +#endif + +int r2net_remote_put(struct tmem_xhandle *xh, char *data, size_t size, + bool ephemeral, int *remotenode) +{ + int nodenum, ret = -1, status; + struct r2nm_node *node = NULL; + struct kvec vec[2]; + size_t veclen = 2; + u32 msg_type; + struct r2net_node *nn; + + BUG_ON(size > RMSTR_R2NET_MAX_LEN); + xh->client_id = r2nm_this_node(); /* which node is putting */ + vec[0].iov_len = sizeof(*xh); + vec[0].iov_base = xh; + vec[1].iov_len = size; + vec[1].iov_base = data; + + node = r2net_target_node; + if (!node) + goto out; + + nodenum = r2net_target_nodenum; + + r2nm_node_get(node); + + nn = r2net_nn_from_num(nodenum); + if (nn->nn_persistent_error || !nn->nn_sc_valid) { + ret = -ENOTCONN; + r2nm_node_put(node); + goto out; + } + + if (ephemeral) + msg_type = RMSTR_TMEM_PUT_EPH; + else + msg_type = RMSTR_TMEM_PUT_PERS; +#ifdef RAMSTER_TESTING + /* leave me here to see if it catches a weird crash */ + ramster_check_irq_counts(); +#endif + + ret = r2net_send_message_vec(msg_type, RMSTR_KEY, vec, veclen, + nodenum, &status); + if (ret < 0) + ret = -1; + else { + ret = status; + *remotenode = nodenum; + } + + r2nm_node_put(node); +out: + return ret; +} + +int r2net_remote_flush(struct tmem_xhandle *xh, int remotenode) +{ + int ret = -1, status; + struct r2nm_node *node = NULL; + struct kvec vec[1]; + size_t veclen = 1; + + node = r2nm_get_node_by_num(remotenode); + BUG_ON(node == NULL); + xh->client_id = r2nm_this_node(); /* which node is flushing */ + vec[0].iov_len = sizeof(*xh); + vec[0].iov_base = xh; + BUG_ON(irqs_disabled()); + BUG_ON(in_softirq()); + ret = r2net_send_message_vec(RMSTR_TMEM_FLUSH, RMSTR_KEY, + vec, veclen, remotenode, &status); + r2nm_node_put(node); + return ret; +} + +int r2net_remote_flush_object(struct tmem_xhandle *xh, int remotenode) +{ + int ret = -1, status; + struct r2nm_node *node = NULL; + struct kvec vec[1]; + size_t veclen = 1; + + node = r2nm_get_node_by_num(remotenode); + BUG_ON(node == NULL); + xh->client_id = r2nm_this_node(); /* which node is flobjing */ + vec[0].iov_len = sizeof(*xh); + vec[0].iov_base = xh; + ret = r2net_send_message_vec(RMSTR_TMEM_FLOBJ, RMSTR_KEY, + vec, veclen, remotenode, &status); + r2nm_node_put(node); + return ret; +} + +/* + * Handler registration + */ + +static LIST_HEAD(r2net_unreg_list); + +static void r2net_unregister_handlers(void) +{ + r2net_unregister_handler_list(&r2net_unreg_list); +} + +int r2net_register_handlers(void) +{ + int status; + + status = r2net_register_handler(RMSTR_TMEM_PUT_EPH, RMSTR_KEY, + RMSTR_R2NET_MAX_LEN, + ramster_remote_put_handler, + NULL, NULL, &r2net_unreg_list); + if (status) + goto bail; + + status = r2net_register_handler(RMSTR_TMEM_PUT_PERS, RMSTR_KEY, + RMSTR_R2NET_MAX_LEN, + ramster_remote_put_handler, + NULL, NULL, &r2net_unreg_list); + if (status) + goto bail; + + status = r2net_register_handler(RMSTR_TMEM_ASYNC_GET_REQUEST, RMSTR_KEY, + RMSTR_R2NET_MAX_LEN, + ramster_remote_async_get_request_handler, + NULL, NULL, + &r2net_unreg_list); + if (status) + goto bail; + + status = r2net_register_handler(RMSTR_TMEM_ASYNC_GET_AND_FREE_REQUEST, + RMSTR_KEY, RMSTR_R2NET_MAX_LEN, + ramster_remote_async_get_request_handler, + NULL, NULL, + &r2net_unreg_list); + if (status) + goto bail; + + status = r2net_register_handler(RMSTR_TMEM_ASYNC_GET_REPLY, RMSTR_KEY, + RMSTR_R2NET_MAX_LEN, + ramster_remote_async_get_reply_handler, + NULL, NULL, + &r2net_unreg_list); + if (status) + goto bail; + + status = r2net_register_handler(RMSTR_TMEM_FLUSH, RMSTR_KEY, + RMSTR_R2NET_MAX_LEN, + ramster_remote_flush_handler, + NULL, NULL, + &r2net_unreg_list); + if (status) + goto bail; + + status = r2net_register_handler(RMSTR_TMEM_FLOBJ, RMSTR_KEY, + RMSTR_R2NET_MAX_LEN, + ramster_remote_flobj_handler, + NULL, NULL, + &r2net_unreg_list); + if (status) + goto bail; + + pr_info("ramster: r2net handlers registered\n"); + +bail: + if (status) { + r2net_unregister_handlers(); + pr_err("ramster: couldn't register r2net handlers\n"); + } + return status; +} diff --git a/drivers/staging/ramster/ramster/ramster.c b/drivers/staging/ramster/ramster/ramster.c new file mode 100644 index 000000000000..c06709f39682 --- /dev/null +++ b/drivers/staging/ramster/ramster/ramster.c @@ -0,0 +1,985 @@ +/* + * ramster.c + * + * Copyright (c) 2010-2012, Dan Magenheimer, Oracle Corp. + * + * RAMster implements peer-to-peer transcendent memory, allowing a "cluster" of + * kernels to dynamically pool their RAM so that a RAM-hungry workload on one + * machine can temporarily and transparently utilize RAM on another machine + * which is presumably idle or running a non-RAM-hungry workload. + * + * RAMster combines a clustering and messaging foundation based on the ocfs2 + * cluster layer with the in-kernel compression implementation of zcache, and + * adds code to glue them together. When a page is "put" to RAMster, it is + * compressed and stored locally. Periodically, a thread will "remotify" these + * pages by sending them via messages to a remote machine. When the page is + * later needed as indicated by a page fault, a "get" is issued. If the data + * is local, it is uncompressed and the fault is resolved. If the data is + * remote, a message is sent to fetch the data and the faulting thread sleeps; + * when the data arrives, the thread awakens, the data is decompressed and + * the fault is resolved. + + * As of V5, clusters up to eight nodes are supported; each node can remotify + * pages to one specified node, so clusters can be configured as clients to + * a "memory server". Some simple policy is in place that will need to be + * refined over time. Larger clusters and fault-resistant protocols can also + * be added over time. + */ + +#include <linux/module.h> +#include <linux/cpu.h> +#include <linux/highmem.h> +#include <linux/list.h> +#include <linux/lzo.h> +#include <linux/slab.h> +#include <linux/spinlock.h> +#include <linux/types.h> +#include <linux/atomic.h> +#include <linux/frontswap.h> +#include "../tmem.h" +#include "../zcache.h" +#include "../zbud.h" +#include "ramster.h" +#include "ramster_nodemanager.h" +#include "tcp.h" + +#define RAMSTER_TESTING + +#ifndef CONFIG_SYSFS +#error "ramster needs sysfs to define cluster nodes to use" +#endif + +static bool use_cleancache __read_mostly; +static bool use_frontswap __read_mostly; +static bool use_frontswap_exclusive_gets __read_mostly; + +/* These must be sysfs not debugfs as they are checked/used by userland!! */ +static unsigned long ramster_interface_revision __read_mostly = + R2NM_API_VERSION; /* interface revision must match userspace! */ +static unsigned long ramster_pers_remotify_enable __read_mostly; +static unsigned long ramster_eph_remotify_enable __read_mostly; +static atomic_t ramster_remote_pers_pages = ATOMIC_INIT(0); +#define MANUAL_NODES 8 +static bool ramster_nodes_manual_up[MANUAL_NODES] __read_mostly; +static int ramster_remote_target_nodenum __read_mostly = -1; + +/* these counters are made available via debugfs */ +static long ramster_flnodes; +static atomic_t ramster_flnodes_atomic = ATOMIC_INIT(0); +static unsigned long ramster_flnodes_max; +static long ramster_foreign_eph_pages; +static atomic_t ramster_foreign_eph_pages_atomic = ATOMIC_INIT(0); +static unsigned long ramster_foreign_eph_pages_max; +static long ramster_foreign_pers_pages; +static atomic_t ramster_foreign_pers_pages_atomic = ATOMIC_INIT(0); +static unsigned long ramster_foreign_pers_pages_max; +static unsigned long ramster_eph_pages_remoted; +static unsigned long ramster_pers_pages_remoted; +static unsigned long ramster_eph_pages_remote_failed; +static unsigned long ramster_pers_pages_remote_failed; +static unsigned long ramster_remote_eph_pages_succ_get; +static unsigned long ramster_remote_pers_pages_succ_get; +static unsigned long ramster_remote_eph_pages_unsucc_get; +static unsigned long ramster_remote_pers_pages_unsucc_get; +static unsigned long ramster_pers_pages_remote_nomem; +static unsigned long ramster_remote_objects_flushed; +static unsigned long ramster_remote_object_flushes_failed; +static unsigned long ramster_remote_pages_flushed; +static unsigned long ramster_remote_page_flushes_failed; +/* FIXME frontswap selfshrinking knobs in debugfs? */ + +#ifdef CONFIG_DEBUG_FS +#include <linux/debugfs.h> +#define zdfs debugfs_create_size_t +#define zdfs64 debugfs_create_u64 +static int __init ramster_debugfs_init(void) +{ + struct dentry *root = debugfs_create_dir("ramster", NULL); + if (root == NULL) + return -ENXIO; + + zdfs("eph_pages_remoted", S_IRUGO, root, &ramster_eph_pages_remoted); + zdfs("pers_pages_remoted", S_IRUGO, root, &ramster_pers_pages_remoted); + zdfs("eph_pages_remote_failed", S_IRUGO, root, + &ramster_eph_pages_remote_failed); + zdfs("pers_pages_remote_failed", S_IRUGO, root, + &ramster_pers_pages_remote_failed); + zdfs("remote_eph_pages_succ_get", S_IRUGO, root, + &ramster_remote_eph_pages_succ_get); + zdfs("remote_pers_pages_succ_get", S_IRUGO, root, + &ramster_remote_pers_pages_succ_get); + zdfs("remote_eph_pages_unsucc_get", S_IRUGO, root, + &ramster_remote_eph_pages_unsucc_get); + zdfs("remote_pers_pages_unsucc_get", S_IRUGO, root, + &ramster_remote_pers_pages_unsucc_get); + zdfs("pers_pages_remote_nomem", S_IRUGO, root, + &ramster_pers_pages_remote_nomem); + zdfs("remote_objects_flushed", S_IRUGO, root, + &ramster_remote_objects_flushed); + zdfs("remote_pages_flushed", S_IRUGO, root, + &ramster_remote_pages_flushed); + zdfs("remote_object_flushes_failed", S_IRUGO, root, + &ramster_remote_object_flushes_failed); + zdfs("remote_page_flushes_failed", S_IRUGO, root, + &ramster_remote_page_flushes_failed); + zdfs("foreign_eph_pages", S_IRUGO, root, + &ramster_foreign_eph_pages); + zdfs("foreign_eph_pages_max", S_IRUGO, root, + &ramster_foreign_eph_pages_max); + zdfs("foreign_pers_pages", S_IRUGO, root, + &ramster_foreign_pers_pages); + zdfs("foreign_pers_pages_max", S_IRUGO, root, + &ramster_foreign_pers_pages_max); + return 0; +} +#undef zdebugfs +#undef zdfs64 +#endif + +static LIST_HEAD(ramster_rem_op_list); +static DEFINE_SPINLOCK(ramster_rem_op_list_lock); +static DEFINE_PER_CPU(struct ramster_preload, ramster_preloads); + +static DEFINE_PER_CPU(unsigned char *, ramster_remoteputmem1); +static DEFINE_PER_CPU(unsigned char *, ramster_remoteputmem2); + +static struct kmem_cache *ramster_flnode_cache __read_mostly; + +static struct flushlist_node *ramster_flnode_alloc(struct tmem_pool *pool) +{ + struct flushlist_node *flnode = NULL; + struct ramster_preload *kp; + + kp = &__get_cpu_var(ramster_preloads); + flnode = kp->flnode; + BUG_ON(flnode == NULL); + kp->flnode = NULL; + ramster_flnodes = atomic_inc_return(&ramster_flnodes_atomic); + if (ramster_flnodes > ramster_flnodes_max) + ramster_flnodes_max = ramster_flnodes; + return flnode; +} + +/* the "flush list" asynchronously collects pages to remotely flush */ +#define FLUSH_ENTIRE_OBJECT ((uint32_t)-1) +static void ramster_flnode_free(struct flushlist_node *flnode, + struct tmem_pool *pool) +{ + int flnodes; + + flnodes = atomic_dec_return(&ramster_flnodes_atomic); + BUG_ON(flnodes < 0); + kmem_cache_free(ramster_flnode_cache, flnode); +} + +int ramster_do_preload_flnode(struct tmem_pool *pool) +{ + struct ramster_preload *kp; + struct flushlist_node *flnode; + int ret = -ENOMEM; + + BUG_ON(!irqs_disabled()); + if (unlikely(ramster_flnode_cache == NULL)) + BUG(); + kp = &__get_cpu_var(ramster_preloads); + flnode = kmem_cache_alloc(ramster_flnode_cache, GFP_ATOMIC); + if (unlikely(flnode == NULL) && kp->flnode == NULL) + BUG(); /* FIXME handle more gracefully, but how??? */ + else if (kp->flnode == NULL) + kp->flnode = flnode; + else + kmem_cache_free(ramster_flnode_cache, flnode); + return ret; +} + +/* + * Called by the message handler after a (still compressed) page has been + * fetched from the remote machine in response to an "is_remote" tmem_get + * or persistent tmem_localify. For a tmem_get, "extra" is the address of + * the page that is to be filled to successfully resolve the tmem_get; for + * a (persistent) tmem_localify, "extra" is NULL (as the data is placed only + * in the local zcache). "data" points to "size" bytes of (compressed) data + * passed in the message. In the case of a persistent remote get, if + * pre-allocation was successful (see ramster_repatriate_preload), the page + * is placed into both local zcache and at "extra". + */ +int ramster_localify(int pool_id, struct tmem_oid *oidp, uint32_t index, + char *data, unsigned int size, void *extra) +{ + int ret = -ENOENT; + unsigned long flags; + struct tmem_pool *pool; + bool eph, delete = false; + void *pampd, *saved_hb; + struct tmem_obj *obj; + + pool = zcache_get_pool_by_id(LOCAL_CLIENT, pool_id); + if (unlikely(pool == NULL)) + /* pool doesn't exist anymore */ + goto out; + eph = is_ephemeral(pool); + local_irq_save(flags); /* FIXME: maybe only disable softirqs? */ + pampd = tmem_localify_get_pampd(pool, oidp, index, &obj, &saved_hb); + if (pampd == NULL) { + /* hmmm... must have been a flush while waiting */ +#ifdef RAMSTER_TESTING + pr_err("UNTESTED pampd==NULL in ramster_localify\n"); +#endif + if (eph) + ramster_remote_eph_pages_unsucc_get++; + else + ramster_remote_pers_pages_unsucc_get++; + obj = NULL; + goto finish; + } else if (unlikely(!pampd_is_remote(pampd))) { + /* hmmm... must have been a dup put while waiting */ +#ifdef RAMSTER_TESTING + pr_err("UNTESTED dup while waiting in ramster_localify\n"); +#endif + if (eph) + ramster_remote_eph_pages_unsucc_get++; + else + ramster_remote_pers_pages_unsucc_get++; + obj = NULL; + pampd = NULL; + ret = -EEXIST; + goto finish; + } else if (size == 0) { + /* no remote data, delete the local is_remote pampd */ + pampd = NULL; + if (eph) + ramster_remote_eph_pages_unsucc_get++; + else + BUG(); + delete = true; + goto finish; + } + if (pampd_is_intransit(pampd)) { + /* + * a pampd is marked intransit if it is remote and space has + * been allocated for it locally (note, only happens for + * persistent pages, in which case the remote copy is freed) + */ + BUG_ON(eph); + pampd = pampd_mask_intransit_and_remote(pampd); + zbud_copy_to_zbud(pampd, data, size); + } else { + /* + * setting pampd to NULL tells tmem_localify_finish to leave + * pampd alone... meaning it is left pointing to the + * remote copy + */ + pampd = NULL; + obj = NULL; + } + /* + * but in all cases, we decompress direct-to-memory to complete + * the remotify and return success + */ + BUG_ON(extra == NULL); + zcache_decompress_to_page(data, size, (struct page *)extra); + if (eph) + ramster_remote_eph_pages_succ_get++; + else + ramster_remote_pers_pages_succ_get++; + ret = 0; +finish: + tmem_localify_finish(obj, index, pampd, saved_hb, delete); + zcache_put_pool(pool); + local_irq_restore(flags); +out: + return ret; +} + +void ramster_pampd_new_obj(struct tmem_obj *obj) +{ + obj->extra = NULL; +} + +void ramster_pampd_free_obj(struct tmem_pool *pool, struct tmem_obj *obj, + bool pool_destroy) +{ + struct flushlist_node *flnode; + + BUG_ON(preemptible()); + if (obj->extra == NULL) + return; + if (pool_destroy && is_ephemeral(pool)) + /* FIXME don't bother with remote eph data for now */ + return; + BUG_ON(!pampd_is_remote(obj->extra)); + flnode = ramster_flnode_alloc(pool); + flnode->xh.client_id = pampd_remote_node(obj->extra); + flnode->xh.pool_id = pool->pool_id; + flnode->xh.oid = obj->oid; + flnode->xh.index = FLUSH_ENTIRE_OBJECT; + flnode->rem_op.op = RAMSTER_REMOTIFY_FLUSH_OBJ; + spin_lock(&ramster_rem_op_list_lock); + list_add(&flnode->rem_op.list, &ramster_rem_op_list); + spin_unlock(&ramster_rem_op_list_lock); +} + +/* + * Called on a remote persistent tmem_get to attempt to preallocate + * local storage for the data contained in the remote persistent page. + * If successfully preallocated, returns the pampd, marked as remote and + * in_transit. Else returns NULL. Note that the appropriate tmem data + * structure must be locked. + */ +void *ramster_pampd_repatriate_preload(void *pampd, struct tmem_pool *pool, + struct tmem_oid *oidp, uint32_t index, + bool *intransit) +{ + int clen = pampd_remote_size(pampd), c; + void *ret_pampd = NULL; + unsigned long flags; + struct tmem_handle th; + + BUG_ON(!pampd_is_remote(pampd)); + BUG_ON(is_ephemeral(pool)); + if (use_frontswap_exclusive_gets) + /* don't need local storage */ + goto out; + if (pampd_is_intransit(pampd)) { + /* + * to avoid multiple allocations (and maybe a memory leak) + * don't preallocate if already in the process of being + * repatriated + */ + *intransit = true; + goto out; + } + *intransit = false; + local_irq_save(flags); + th.client_id = pampd_remote_node(pampd); + th.pool_id = pool->pool_id; + th.oid = *oidp; + th.index = index; + ret_pampd = zcache_pampd_create(NULL, clen, true, false, &th); + if (ret_pampd != NULL) { + /* + * a pampd is marked intransit if it is remote and space has + * been allocated for it locally (note, only happens for + * persistent pages, in which case the remote copy is freed) + */ + ret_pampd = pampd_mark_intransit(ret_pampd); + c = atomic_dec_return(&ramster_remote_pers_pages); + WARN_ON_ONCE(c < 0); + } else { + ramster_pers_pages_remote_nomem++; + } + local_irq_restore(flags); +out: + return ret_pampd; +} + +/* + * Called on a remote tmem_get to invoke a message to fetch the page. + * Might sleep so no tmem locks can be held. "extra" is passed + * all the way through the round-trip messaging to ramster_localify. + */ +int ramster_pampd_repatriate(void *fake_pampd, void *real_pampd, + struct tmem_pool *pool, + struct tmem_oid *oid, uint32_t index, + bool free, void *extra) +{ + struct tmem_xhandle xh; + int ret; + + if (pampd_is_intransit(real_pampd)) + /* have local space pre-reserved, so free remote copy */ + free = true; + xh = tmem_xhandle_fill(LOCAL_CLIENT, pool, oid, index); + /* unreliable request/response for now */ + ret = r2net_remote_async_get(&xh, free, + pampd_remote_node(fake_pampd), + pampd_remote_size(fake_pampd), + pampd_remote_cksum(fake_pampd), + extra); + return ret; +} + +bool ramster_pampd_is_remote(void *pampd) +{ + return pampd_is_remote(pampd); +} + +int ramster_pampd_replace_in_obj(void *new_pampd, struct tmem_obj *obj) +{ + int ret = -1; + + if (new_pampd != NULL) { + if (obj->extra == NULL) + obj->extra = new_pampd; + /* enforce that all remote pages in an object reside + * in the same node! */ + else if (pampd_remote_node(new_pampd) != + pampd_remote_node((void *)(obj->extra))) + BUG(); + ret = 0; + } + return ret; +} + +void *ramster_pampd_free(void *pampd, struct tmem_pool *pool, + struct tmem_oid *oid, uint32_t index, bool acct) +{ + bool eph = is_ephemeral(pool); + void *local_pampd = NULL; + int c; + + BUG_ON(preemptible()); + BUG_ON(!pampd_is_remote(pampd)); + WARN_ON(acct == false); + if (oid == NULL) { + /* + * a NULL oid means to ignore this pampd free + * as the remote freeing will be handled elsewhere + */ + } else if (eph) { + /* FIXME remote flush optional but probably good idea */ + } else if (pampd_is_intransit(pampd)) { + /* did a pers remote get_and_free, so just free local */ + local_pampd = pampd_mask_intransit_and_remote(pampd); + } else { + struct flushlist_node *flnode = + ramster_flnode_alloc(pool); + + flnode->xh.client_id = pampd_remote_node(pampd); + flnode->xh.pool_id = pool->pool_id; + flnode->xh.oid = *oid; + flnode->xh.index = index; + flnode->rem_op.op = RAMSTER_REMOTIFY_FLUSH_PAGE; + spin_lock(&ramster_rem_op_list_lock); + list_add(&flnode->rem_op.list, &ramster_rem_op_list); + spin_unlock(&ramster_rem_op_list_lock); + c = atomic_dec_return(&ramster_remote_pers_pages); + WARN_ON_ONCE(c < 0); + } + return local_pampd; +} + +void ramster_count_foreign_pages(bool eph, int count) +{ + int c; + + BUG_ON(count != 1 && count != -1); + if (eph) { + if (count > 0) { + c = atomic_inc_return( + &ramster_foreign_eph_pages_atomic); + if (c > ramster_foreign_eph_pages_max) + ramster_foreign_eph_pages_max = c; + } else { + c = atomic_dec_return(&ramster_foreign_eph_pages_atomic); + WARN_ON_ONCE(c < 0); + } + ramster_foreign_eph_pages = c; + } else { + if (count > 0) { + c = atomic_inc_return( + &ramster_foreign_pers_pages_atomic); + if (c > ramster_foreign_pers_pages_max) + ramster_foreign_pers_pages_max = c; + } else { + c = atomic_dec_return( + &ramster_foreign_pers_pages_atomic); + WARN_ON_ONCE(c < 0); + } + ramster_foreign_pers_pages = c; + } +} + +/* + * For now, just push over a few pages every few seconds to + * ensure that it basically works + */ +static struct workqueue_struct *ramster_remotify_workqueue; +static void ramster_remotify_process(struct work_struct *work); +static DECLARE_DELAYED_WORK(ramster_remotify_worker, + ramster_remotify_process); + +static void ramster_remotify_queue_delayed_work(unsigned long delay) +{ + if (!queue_delayed_work(ramster_remotify_workqueue, + &ramster_remotify_worker, delay)) + pr_err("ramster_remotify: bad workqueue\n"); +} + +static void ramster_remote_flush_page(struct flushlist_node *flnode) +{ + struct tmem_xhandle *xh; + int remotenode, ret; + + preempt_disable(); + xh = &flnode->xh; + remotenode = flnode->xh.client_id; + ret = r2net_remote_flush(xh, remotenode); + if (ret >= 0) + ramster_remote_pages_flushed++; + else + ramster_remote_page_flushes_failed++; + preempt_enable_no_resched(); + ramster_flnode_free(flnode, NULL); +} + +static void ramster_remote_flush_object(struct flushlist_node *flnode) +{ + struct tmem_xhandle *xh; + int remotenode, ret; + + preempt_disable(); + xh = &flnode->xh; + remotenode = flnode->xh.client_id; + ret = r2net_remote_flush_object(xh, remotenode); + if (ret >= 0) + ramster_remote_objects_flushed++; + else + ramster_remote_object_flushes_failed++; + preempt_enable_no_resched(); + ramster_flnode_free(flnode, NULL); +} + +int ramster_remotify_pageframe(bool eph) +{ + struct tmem_xhandle xh; + unsigned int size; + int remotenode, ret, zbuds; + struct tmem_pool *pool; + unsigned long flags; + unsigned char cksum; + char *p; + int i, j; + unsigned char *tmpmem[2]; + struct tmem_handle th[2]; + unsigned int zsize[2]; + + tmpmem[0] = __get_cpu_var(ramster_remoteputmem1); + tmpmem[1] = __get_cpu_var(ramster_remoteputmem2); + local_bh_disable(); + zbuds = zbud_make_zombie_lru(&th[0], &tmpmem[0], &zsize[0], eph); + /* now OK to release lock set in caller */ + local_bh_enable(); + if (zbuds == 0) + goto out; + BUG_ON(zbuds > 2); + for (i = 0; i < zbuds; i++) { + xh.client_id = th[i].client_id; + xh.pool_id = th[i].pool_id; + xh.oid = th[i].oid; + xh.index = th[i].index; + size = zsize[i]; + BUG_ON(size == 0 || size > zbud_max_buddy_size()); + for (p = tmpmem[i], cksum = 0, j = 0; j < size; j++) + cksum += *p++; + ret = r2net_remote_put(&xh, tmpmem[i], size, eph, &remotenode); + if (ret != 0) { + /* + * This is some form of a memory leak... if the remote put + * fails, there will never be another attempt to remotify + * this page. But since we've dropped the zv pointer, + * the page may have been freed or the data replaced + * so we can't just "put it back" in the remote op list. + * Even if we could, not sure where to put it in the list + * because there may be flushes that must be strictly + * ordered vs the put. So leave this as a FIXME for now. + * But count them so we know if it becomes a problem. + */ + if (eph) + ramster_eph_pages_remote_failed++; + else + ramster_pers_pages_remote_failed++; + break; + } else { + if (!eph) + atomic_inc(&ramster_remote_pers_pages); + } + if (eph) + ramster_eph_pages_remoted++; + else + ramster_pers_pages_remoted++; + /* + * data was successfully remoted so change the local version to + * point to the remote node where it landed + */ + local_bh_disable(); + pool = zcache_get_pool_by_id(LOCAL_CLIENT, xh.pool_id); + local_irq_save(flags); + (void)tmem_replace(pool, &xh.oid, xh.index, + pampd_make_remote(remotenode, size, cksum)); + local_irq_restore(flags); + zcache_put_pool(pool); + local_bh_enable(); + } +out: + return zbuds; +} + +static void zcache_do_remotify_flushes(void) +{ + struct ramster_remotify_hdr *rem_op; + union remotify_list_node *u; + + while (1) { + spin_lock(&ramster_rem_op_list_lock); + if (list_empty(&ramster_rem_op_list)) { + spin_unlock(&ramster_rem_op_list_lock); + goto out; + } + rem_op = list_first_entry(&ramster_rem_op_list, + struct ramster_remotify_hdr, list); + list_del_init(&rem_op->list); + spin_unlock(&ramster_rem_op_list_lock); + u = (union remotify_list_node *)rem_op; + switch (rem_op->op) { + case RAMSTER_REMOTIFY_FLUSH_PAGE: + ramster_remote_flush_page((struct flushlist_node *)u); + break; + case RAMSTER_REMOTIFY_FLUSH_OBJ: + ramster_remote_flush_object((struct flushlist_node *)u); + break; + default: + BUG(); + } + } +out: + return; +} + +static void ramster_remotify_process(struct work_struct *work) +{ + static bool remotify_in_progress; + int i; + + BUG_ON(irqs_disabled()); + if (remotify_in_progress) + goto requeue; + if (ramster_remote_target_nodenum == -1) + goto requeue; + remotify_in_progress = true; + if (use_cleancache && ramster_eph_remotify_enable) { + for (i = 0; i < 100; i++) { + zcache_do_remotify_flushes(); + (void)ramster_remotify_pageframe(true); + } + } + if (use_frontswap && ramster_pers_remotify_enable) { + for (i = 0; i < 100; i++) { + zcache_do_remotify_flushes(); + (void)ramster_remotify_pageframe(false); + } + } + remotify_in_progress = false; +requeue: + ramster_remotify_queue_delayed_work(HZ); +} + +void __init ramster_remotify_init(void) +{ + unsigned long n = 60UL; + ramster_remotify_workqueue = + create_singlethread_workqueue("ramster_remotify"); + ramster_remotify_queue_delayed_work(n * HZ); +} + +static ssize_t ramster_manual_node_up_show(struct kobject *kobj, + struct kobj_attribute *attr, char *buf) +{ + int i; + char *p = buf; + for (i = 0; i < MANUAL_NODES; i++) + if (ramster_nodes_manual_up[i]) + p += sprintf(p, "%d ", i); + p += sprintf(p, "\n"); + return p - buf; +} + +static ssize_t ramster_manual_node_up_store(struct kobject *kobj, + struct kobj_attribute *attr, const char *buf, size_t count) +{ + int err; + unsigned long node_num; + + err = kstrtoul(buf, 10, &node_num); + if (err) { + pr_err("ramster: bad strtoul?\n"); + return -EINVAL; + } + if (node_num >= MANUAL_NODES) { + pr_err("ramster: bad node_num=%lu?\n", node_num); + return -EINVAL; + } + if (ramster_nodes_manual_up[node_num]) { + pr_err("ramster: node %d already up, ignoring\n", + (int)node_num); + } else { + ramster_nodes_manual_up[node_num] = true; + r2net_hb_node_up_manual((int)node_num); + } + return count; +} + +static struct kobj_attribute ramster_manual_node_up_attr = { + .attr = { .name = "manual_node_up", .mode = 0644 }, + .show = ramster_manual_node_up_show, + .store = ramster_manual_node_up_store, +}; + +static ssize_t ramster_remote_target_nodenum_show(struct kobject *kobj, + struct kobj_attribute *attr, char *buf) +{ + if (ramster_remote_target_nodenum == -1UL) + return sprintf(buf, "unset\n"); + else + return sprintf(buf, "%d\n", ramster_remote_target_nodenum); +} + +static ssize_t ramster_remote_target_nodenum_store(struct kobject *kobj, + struct kobj_attribute *attr, const char *buf, size_t count) +{ + int err; + unsigned long node_num; + + err = kstrtoul(buf, 10, &node_num); + if (err) { + pr_err("ramster: bad strtoul?\n"); + return -EINVAL; + } else if (node_num == -1UL) { + pr_err("ramster: disabling all remotification, " + "data may still reside on remote nodes however\n"); + return -EINVAL; + } else if (node_num >= MANUAL_NODES) { + pr_err("ramster: bad node_num=%lu?\n", node_num); + return -EINVAL; + } else if (!ramster_nodes_manual_up[node_num]) { + pr_err("ramster: node %d not up, ignoring setting " + "of remotification target\n", (int)node_num); + } else if (r2net_remote_target_node_set((int)node_num) >= 0) { + pr_info("ramster: node %d set as remotification target\n", + (int)node_num); + ramster_remote_target_nodenum = (int)node_num; + } else { + pr_err("ramster: bad num to node node_num=%d?\n", + (int)node_num); + return -EINVAL; + } + return count; +} + +static struct kobj_attribute ramster_remote_target_nodenum_attr = { + .attr = { .name = "remote_target_nodenum", .mode = 0644 }, + .show = ramster_remote_target_nodenum_show, + .store = ramster_remote_target_nodenum_store, +}; + +#define RAMSTER_SYSFS_RO(_name) \ + static ssize_t ramster_##_name##_show(struct kobject *kobj, \ + struct kobj_attribute *attr, char *buf) \ + { \ + return sprintf(buf, "%lu\n", ramster_##_name); \ + } \ + static struct kobj_attribute ramster_##_name##_attr = { \ + .attr = { .name = __stringify(_name), .mode = 0444 }, \ + .show = ramster_##_name##_show, \ + } + +#define RAMSTER_SYSFS_RW(_name) \ + static ssize_t ramster_##_name##_show(struct kobject *kobj, \ + struct kobj_attribute *attr, char *buf) \ + { \ + return sprintf(buf, "%lu\n", ramster_##_name); \ + } \ + static ssize_t ramster_##_name##_store(struct kobject *kobj, \ + struct kobj_attribute *attr, const char *buf, size_t count) \ + { \ + int err; \ + unsigned long enable; \ + err = kstrtoul(buf, 10, &enable); \ + if (err) \ + return -EINVAL; \ + ramster_##_name = enable; \ + return count; \ + } \ + static struct kobj_attribute ramster_##_name##_attr = { \ + .attr = { .name = __stringify(_name), .mode = 0644 }, \ + .show = ramster_##_name##_show, \ + .store = ramster_##_name##_store, \ + } + +#define RAMSTER_SYSFS_RO_ATOMIC(_name) \ + static ssize_t ramster_##_name##_show(struct kobject *kobj, \ + struct kobj_attribute *attr, char *buf) \ + { \ + return sprintf(buf, "%d\n", atomic_read(&ramster_##_name)); \ + } \ + static struct kobj_attribute ramster_##_name##_attr = { \ + .attr = { .name = __stringify(_name), .mode = 0444 }, \ + .show = ramster_##_name##_show, \ + } + +RAMSTER_SYSFS_RO(interface_revision); +RAMSTER_SYSFS_RO_ATOMIC(remote_pers_pages); +RAMSTER_SYSFS_RW(pers_remotify_enable); +RAMSTER_SYSFS_RW(eph_remotify_enable); + +static struct attribute *ramster_attrs[] = { + &ramster_interface_revision_attr.attr, + &ramster_remote_pers_pages_attr.attr, + &ramster_manual_node_up_attr.attr, + &ramster_remote_target_nodenum_attr.attr, + &ramster_pers_remotify_enable_attr.attr, + &ramster_eph_remotify_enable_attr.attr, + NULL, +}; + +static struct attribute_group ramster_attr_group = { + .attrs = ramster_attrs, + .name = "ramster", +}; + +/* + * frontswap selfshrinking + */ + +/* In HZ, controls frequency of worker invocation. */ +static unsigned int selfshrink_interval __read_mostly = 5; +/* Enable/disable with sysfs. */ +static bool frontswap_selfshrinking __read_mostly; + +static void selfshrink_process(struct work_struct *work); +static DECLARE_DELAYED_WORK(selfshrink_worker, selfshrink_process); + +/* Enable/disable with kernel boot option. */ +static bool use_frontswap_selfshrink __initdata = true; + +/* + * The default values for the following parameters were deemed reasonable + * by experimentation, may be workload-dependent, and can all be + * adjusted via sysfs. + */ + +/* Control rate for frontswap shrinking. Higher hysteresis is slower. */ +static unsigned int frontswap_hysteresis __read_mostly = 20; + +/* + * Number of selfshrink worker invocations to wait before observing that + * frontswap selfshrinking should commence. Note that selfshrinking does + * not use a separate worker thread. + */ +static unsigned int frontswap_inertia __read_mostly = 3; + +/* Countdown to next invocation of frontswap_shrink() */ +static unsigned long frontswap_inertia_counter; + +/* + * Invoked by the selfshrink worker thread, uses current number of pages + * in frontswap (frontswap_curr_pages()), previous status, and control + * values (hysteresis and inertia) to determine if frontswap should be + * shrunk and what the new frontswap size should be. Note that + * frontswap_shrink is essentially a partial swapoff that immediately + * transfers pages from the "swap device" (frontswap) back into kernel + * RAM; despite the name, frontswap "shrinking" is very different from + * the "shrinker" interface used by the kernel MM subsystem to reclaim + * memory. + */ +static void frontswap_selfshrink(void) +{ + static unsigned long cur_frontswap_pages; + static unsigned long last_frontswap_pages; + static unsigned long tgt_frontswap_pages; + + last_frontswap_pages = cur_frontswap_pages; + cur_frontswap_pages = frontswap_curr_pages(); + if (!cur_frontswap_pages || + (cur_frontswap_pages > last_frontswap_pages)) { + frontswap_inertia_counter = frontswap_inertia; + return; + } + if (frontswap_inertia_counter && --frontswap_inertia_counter) + return; + if (cur_frontswap_pages <= frontswap_hysteresis) + tgt_frontswap_pages = 0; + else + tgt_frontswap_pages = cur_frontswap_pages - + (cur_frontswap_pages / frontswap_hysteresis); + frontswap_shrink(tgt_frontswap_pages); +} + +static int __init ramster_nofrontswap_selfshrink_setup(char *s) +{ + use_frontswap_selfshrink = false; + return 1; +} + +__setup("noselfshrink", ramster_nofrontswap_selfshrink_setup); + +static void selfshrink_process(struct work_struct *work) +{ + if (frontswap_selfshrinking && frontswap_enabled) { + frontswap_selfshrink(); + schedule_delayed_work(&selfshrink_worker, + selfshrink_interval * HZ); + } +} + +void ramster_cpu_up(int cpu) +{ + unsigned char *p1 = kzalloc(PAGE_SIZE, GFP_KERNEL | __GFP_REPEAT); + unsigned char *p2 = kzalloc(PAGE_SIZE, GFP_KERNEL | __GFP_REPEAT); + BUG_ON(!p1 || !p2); + per_cpu(ramster_remoteputmem1, cpu) = p1; + per_cpu(ramster_remoteputmem2, cpu) = p2; +} + +void ramster_cpu_down(int cpu) +{ + struct ramster_preload *kp; + + kfree(per_cpu(ramster_remoteputmem1, cpu)); + per_cpu(ramster_remoteputmem1, cpu) = NULL; + kfree(per_cpu(ramster_remoteputmem2, cpu)); + per_cpu(ramster_remoteputmem2, cpu) = NULL; + kp = &per_cpu(ramster_preloads, cpu); + if (kp->flnode) { + kmem_cache_free(ramster_flnode_cache, kp->flnode); + kp->flnode = NULL; + } +} + +void ramster_register_pamops(struct tmem_pamops *pamops) +{ + pamops->free_obj = ramster_pampd_free_obj; + pamops->new_obj = ramster_pampd_new_obj; + pamops->replace_in_obj = ramster_pampd_replace_in_obj; + pamops->is_remote = ramster_pampd_is_remote; + pamops->repatriate = ramster_pampd_repatriate; + pamops->repatriate_preload = ramster_pampd_repatriate_preload; +} + +void __init ramster_init(bool cleancache, bool frontswap, + bool frontswap_exclusive_gets) +{ + int ret = 0; + + if (cleancache) + use_cleancache = true; + if (frontswap) + use_frontswap = true; + if (frontswap_exclusive_gets) + use_frontswap_exclusive_gets = true; + ramster_debugfs_init(); + ret = sysfs_create_group(mm_kobj, &ramster_attr_group); + if (ret) + pr_err("ramster: can't create sysfs for ramster\n"); + (void)r2net_register_handlers(); + INIT_LIST_HEAD(&ramster_rem_op_list); + ramster_flnode_cache = kmem_cache_create("ramster_flnode", + sizeof(struct flushlist_node), 0, 0, NULL); + frontswap_selfshrinking = use_frontswap_selfshrink; + if (frontswap_selfshrinking) { + pr_info("ramster: Initializing frontswap selfshrink driver.\n"); + schedule_delayed_work(&selfshrink_worker, + selfshrink_interval * HZ); + } + ramster_remotify_init(); +} diff --git a/drivers/staging/ramster/ramster/ramster.h b/drivers/staging/ramster/ramster/ramster.h new file mode 100644 index 000000000000..12ae56f09ca4 --- /dev/null +++ b/drivers/staging/ramster/ramster/ramster.h @@ -0,0 +1,161 @@ +/* + * ramster.h + * + * Peer-to-peer transcendent memory + * + * Copyright (c) 2009-2012, Dan Magenheimer, Oracle Corp. + */ + +#ifndef _RAMSTER_RAMSTER_H_ +#define _RAMSTER_RAMSTER_H_ + +#include "../tmem.h" + +enum ramster_remotify_op { + RAMSTER_REMOTIFY_FLUSH_PAGE, + RAMSTER_REMOTIFY_FLUSH_OBJ, +}; + +struct ramster_remotify_hdr { + enum ramster_remotify_op op; + struct list_head list; +}; + +struct flushlist_node { + struct ramster_remotify_hdr rem_op; + struct tmem_xhandle xh; +}; + +struct ramster_preload { + struct flushlist_node *flnode; +}; + +union remotify_list_node { + struct ramster_remotify_hdr rem_op; + struct { + struct ramster_remotify_hdr rem_op; + struct tmem_handle th; + } zbud_hdr; + struct flushlist_node flist; +}; + +/* + * format of remote pampd: + * bit 0 is reserved for zbud (in-page buddy selection) + * bit 1 == intransit + * bit 2 == is_remote... if this bit is set, then + * bit 3-10 == remotenode + * bit 11-23 == size + * bit 24-31 == cksum + */ +#define FAKE_PAMPD_INTRANSIT_BITS 1 +#define FAKE_PAMPD_ISREMOTE_BITS 1 +#define FAKE_PAMPD_REMOTENODE_BITS 8 +#define FAKE_PAMPD_REMOTESIZE_BITS 13 +#define FAKE_PAMPD_CHECKSUM_BITS 8 + +#define FAKE_PAMPD_INTRANSIT_SHIFT 1 +#define FAKE_PAMPD_ISREMOTE_SHIFT (FAKE_PAMPD_INTRANSIT_SHIFT + \ + FAKE_PAMPD_INTRANSIT_BITS) +#define FAKE_PAMPD_REMOTENODE_SHIFT (FAKE_PAMPD_ISREMOTE_SHIFT + \ + FAKE_PAMPD_ISREMOTE_BITS) +#define FAKE_PAMPD_REMOTESIZE_SHIFT (FAKE_PAMPD_REMOTENODE_SHIFT + \ + FAKE_PAMPD_REMOTENODE_BITS) +#define FAKE_PAMPD_CHECKSUM_SHIFT (FAKE_PAMPD_REMOTESIZE_SHIFT + \ + FAKE_PAMPD_REMOTESIZE_BITS) + +#define FAKE_PAMPD_MASK(x) ((1UL << (x)) - 1) + +static inline void *pampd_make_remote(int remotenode, size_t size, + unsigned char cksum) +{ + unsigned long fake_pampd = 0; + fake_pampd |= 1UL << FAKE_PAMPD_ISREMOTE_SHIFT; + fake_pampd |= ((unsigned long)remotenode & + FAKE_PAMPD_MASK(FAKE_PAMPD_REMOTENODE_BITS)) << + FAKE_PAMPD_REMOTENODE_SHIFT; + fake_pampd |= ((unsigned long)size & + FAKE_PAMPD_MASK(FAKE_PAMPD_REMOTESIZE_BITS)) << + FAKE_PAMPD_REMOTESIZE_SHIFT; + fake_pampd |= ((unsigned long)cksum & + FAKE_PAMPD_MASK(FAKE_PAMPD_CHECKSUM_BITS)) << + FAKE_PAMPD_CHECKSUM_SHIFT; + return (void *)fake_pampd; +} + +static inline unsigned int pampd_remote_node(void *pampd) +{ + unsigned long fake_pampd = (unsigned long)pampd; + return (fake_pampd >> FAKE_PAMPD_REMOTENODE_SHIFT) & + FAKE_PAMPD_MASK(FAKE_PAMPD_REMOTENODE_BITS); +} + +static inline unsigned int pampd_remote_size(void *pampd) +{ + unsigned long fake_pampd = (unsigned long)pampd; + return (fake_pampd >> FAKE_PAMPD_REMOTESIZE_SHIFT) & + FAKE_PAMPD_MASK(FAKE_PAMPD_REMOTESIZE_BITS); +} + +static inline unsigned char pampd_remote_cksum(void *pampd) +{ + unsigned long fake_pampd = (unsigned long)pampd; + return (fake_pampd >> FAKE_PAMPD_CHECKSUM_SHIFT) & + FAKE_PAMPD_MASK(FAKE_PAMPD_CHECKSUM_BITS); +} + +static inline bool pampd_is_remote(void *pampd) +{ + unsigned long fake_pampd = (unsigned long)pampd; + return (fake_pampd >> FAKE_PAMPD_ISREMOTE_SHIFT) & + FAKE_PAMPD_MASK(FAKE_PAMPD_ISREMOTE_BITS); +} + +static inline bool pampd_is_intransit(void *pampd) +{ + unsigned long fake_pampd = (unsigned long)pampd; + return (fake_pampd >> FAKE_PAMPD_INTRANSIT_SHIFT) & + FAKE_PAMPD_MASK(FAKE_PAMPD_INTRANSIT_BITS); +} + +/* note that it is a BUG for intransit to be set without isremote also set */ +static inline void *pampd_mark_intransit(void *pampd) +{ + unsigned long fake_pampd = (unsigned long)pampd; + + fake_pampd |= 1UL << FAKE_PAMPD_ISREMOTE_SHIFT; + fake_pampd |= 1UL << FAKE_PAMPD_INTRANSIT_SHIFT; + return (void *)fake_pampd; +} + +static inline void *pampd_mask_intransit_and_remote(void *marked_pampd) +{ + unsigned long pampd = (unsigned long)marked_pampd; + + pampd &= ~(1UL << FAKE_PAMPD_INTRANSIT_SHIFT); + pampd &= ~(1UL << FAKE_PAMPD_ISREMOTE_SHIFT); + return (void *)pampd; +} + +extern int r2net_remote_async_get(struct tmem_xhandle *, + bool, int, size_t, uint8_t, void *extra); +extern int r2net_remote_put(struct tmem_xhandle *, char *, size_t, + bool, int *); +extern int r2net_remote_flush(struct tmem_xhandle *, int); +extern int r2net_remote_flush_object(struct tmem_xhandle *, int); +extern int r2net_register_handlers(void); +extern int r2net_remote_target_node_set(int); + +extern int ramster_remotify_pageframe(bool); +extern void ramster_init(bool, bool, bool); +extern void ramster_register_pamops(struct tmem_pamops *); +extern int ramster_localify(int, struct tmem_oid *oidp, uint32_t, char *, + unsigned int, void *); +extern void *ramster_pampd_free(void *, struct tmem_pool *, struct tmem_oid *, + uint32_t, bool); +extern void ramster_count_foreign_pages(bool, int); +extern int ramster_do_preload_flnode(struct tmem_pool *); +extern void ramster_cpu_up(int); +extern void ramster_cpu_down(int); + +#endif /* _RAMSTER_RAMSTER_H */ diff --git a/drivers/staging/ramster/ramster/ramster_nodemanager.h b/drivers/staging/ramster/ramster/ramster_nodemanager.h new file mode 100644 index 000000000000..49f879d943ab --- /dev/null +++ b/drivers/staging/ramster/ramster/ramster_nodemanager.h @@ -0,0 +1,39 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * ramster_nodemanager.h + * + * Header describing the interface between userspace and the kernel + * for the ramster_nodemanager module. + * + * Copyright (C) 2002, 2004, 2012 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + * + */ + +#ifndef _RAMSTER_NODEMANAGER_H +#define _RAMSTER_NODEMANAGER_H + +#define R2NM_API_VERSION 5 + +#define R2NM_MAX_NODES 255 +#define R2NM_INVALID_NODE_NUM 255 + +/* host name, group name, cluster name all 64 bytes */ +#define R2NM_MAX_NAME_LEN 64 /* __NEW_UTS_LEN */ + +#endif /* _RAMSTER_NODEMANAGER_H */ diff --git a/drivers/staging/ramster/ramster/tcp.c b/drivers/staging/ramster/ramster/tcp.c new file mode 100644 index 000000000000..aa2a1a763aa4 --- /dev/null +++ b/drivers/staging/ramster/ramster/tcp.c @@ -0,0 +1,2253 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * Copyright (C) 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + * + * ---- + * + * Callers for this were originally written against a very simple synchronus + * API. This implementation reflects those simple callers. Some day I'm sure + * we'll need to move to a more robust posting/callback mechanism. + * + * Transmit calls pass in kernel virtual addresses and block copying this into + * the socket's tx buffers via a usual blocking sendmsg. They'll block waiting + * for a failed socket to timeout. TX callers can also pass in a poniter to an + * 'int' which gets filled with an errno off the wire in response to the + * message they send. + * + * Handlers for unsolicited messages are registered. Each socket has a page + * that incoming data is copied into. First the header, then the data. + * Handlers are called from only one thread with a reference to this per-socket + * page. This page is destroyed after the handler call, so it can't be + * referenced beyond the call. Handlers may block but are discouraged from + * doing so. + * + * Any framing errors (bad magic, large payload lengths) close a connection. + * + * Our sock_container holds the state we associate with a socket. It's current + * framing state is held there as well as the refcounting we do around when it + * is safe to tear down the socket. The socket is only finally torn down from + * the container when the container loses all of its references -- so as long + * as you hold a ref on the container you can trust that the socket is valid + * for use with kernel socket APIs. + * + * Connections are initiated between a pair of nodes when the node with the + * higher node number gets a heartbeat callback which indicates that the lower + * numbered node has started heartbeating. The lower numbered node is passive + * and only accepts the connection if the higher numbered node is heartbeating. + */ + +#include <linux/kernel.h> +#include <linux/jiffies.h> +#include <linux/slab.h> +#include <linux/idr.h> +#include <linux/kref.h> +#include <linux/net.h> +#include <linux/export.h> +#include <linux/uaccess.h> +#include <net/tcp.h> + + +#include "heartbeat.h" +#include "tcp.h" +#include "nodemanager.h" +#define MLOG_MASK_PREFIX ML_TCP +#include "masklog.h" + +#include "tcp_internal.h" + +#define SC_NODEF_FMT "node %s (num %u) at %pI4:%u" + +/* + * In the following two log macros, the whitespace after the ',' just + * before ##args is intentional. Otherwise, gcc 2.95 will eat the + * previous token if args expands to nothing. + */ +#define msglog(hdr, fmt, args...) do { \ + typeof(hdr) __hdr = (hdr); \ + mlog(ML_MSG, "[mag %u len %u typ %u stat %d sys_stat %d " \ + "key %08x num %u] " fmt, \ + be16_to_cpu(__hdr->magic), be16_to_cpu(__hdr->data_len), \ + be16_to_cpu(__hdr->msg_type), be32_to_cpu(__hdr->status), \ + be32_to_cpu(__hdr->sys_status), be32_to_cpu(__hdr->key), \ + be32_to_cpu(__hdr->msg_num) , ##args); \ +} while (0) + +#define sclog(sc, fmt, args...) do { \ + typeof(sc) __sc = (sc); \ + mlog(ML_SOCKET, "[sc %p refs %d sock %p node %u page %p " \ + "pg_off %zu] " fmt, __sc, \ + atomic_read(&__sc->sc_kref.refcount), __sc->sc_sock, \ + __sc->sc_node->nd_num, __sc->sc_page, __sc->sc_page_off , \ + ##args); \ +} while (0) + +static DEFINE_RWLOCK(r2net_handler_lock); +static struct rb_root r2net_handler_tree = RB_ROOT; + +static struct r2net_node r2net_nodes[R2NM_MAX_NODES]; + +/* XXX someday we'll need better accounting */ +static struct socket *r2net_listen_sock; + +/* + * listen work is only queued by the listening socket callbacks on the + * r2net_wq. teardown detaches the callbacks before destroying the workqueue. + * quorum work is queued as sock containers are shutdown.. stop_listening + * tears down all the node's sock containers, preventing future shutdowns + * and queued quorum work, before canceling delayed quorum work and + * destroying the work queue. + */ +static struct workqueue_struct *r2net_wq; +static struct work_struct r2net_listen_work; + +static struct r2hb_callback_func r2net_hb_up, r2net_hb_down; +#define R2NET_HB_PRI 0x1 + +static struct r2net_handshake *r2net_hand; +static struct r2net_msg *r2net_keep_req, *r2net_keep_resp; + +static int r2net_sys_err_translations[R2NET_ERR_MAX] = { + [R2NET_ERR_NONE] = 0, + [R2NET_ERR_NO_HNDLR] = -ENOPROTOOPT, + [R2NET_ERR_OVERFLOW] = -EOVERFLOW, + [R2NET_ERR_DIED] = -EHOSTDOWN,}; + +/* can't quite avoid *all* internal declarations :/ */ +static void r2net_sc_connect_completed(struct work_struct *work); +static void r2net_rx_until_empty(struct work_struct *work); +static void r2net_shutdown_sc(struct work_struct *work); +static void r2net_listen_data_ready(struct sock *sk, int bytes); +static void r2net_sc_send_keep_req(struct work_struct *work); +static void r2net_idle_timer(unsigned long data); +static void r2net_sc_postpone_idle(struct r2net_sock_container *sc); +static void r2net_sc_reset_idle_timer(struct r2net_sock_container *sc); + +#ifdef CONFIG_DEBUG_FS +static void r2net_init_nst(struct r2net_send_tracking *nst, u32 msgtype, + u32 msgkey, struct task_struct *task, u8 node) +{ + INIT_LIST_HEAD(&nst->st_net_debug_item); + nst->st_task = task; + nst->st_msg_type = msgtype; + nst->st_msg_key = msgkey; + nst->st_node = node; +} + +static inline void r2net_set_nst_sock_time(struct r2net_send_tracking *nst) +{ + nst->st_sock_time = ktime_get(); +} + +static inline void r2net_set_nst_send_time(struct r2net_send_tracking *nst) +{ + nst->st_send_time = ktime_get(); +} + +static inline void r2net_set_nst_status_time(struct r2net_send_tracking *nst) +{ + nst->st_status_time = ktime_get(); +} + +static inline void r2net_set_nst_sock_container(struct r2net_send_tracking *nst, + struct r2net_sock_container *sc) +{ + nst->st_sc = sc; +} + +static inline void r2net_set_nst_msg_id(struct r2net_send_tracking *nst, + u32 msg_id) +{ + nst->st_id = msg_id; +} + +static inline void r2net_set_sock_timer(struct r2net_sock_container *sc) +{ + sc->sc_tv_timer = ktime_get(); +} + +static inline void r2net_set_data_ready_time(struct r2net_sock_container *sc) +{ + sc->sc_tv_data_ready = ktime_get(); +} + +static inline void r2net_set_advance_start_time(struct r2net_sock_container *sc) +{ + sc->sc_tv_advance_start = ktime_get(); +} + +static inline void r2net_set_advance_stop_time(struct r2net_sock_container *sc) +{ + sc->sc_tv_advance_stop = ktime_get(); +} + +static inline void r2net_set_func_start_time(struct r2net_sock_container *sc) +{ + sc->sc_tv_func_start = ktime_get(); +} + +static inline void r2net_set_func_stop_time(struct r2net_sock_container *sc) +{ + sc->sc_tv_func_stop = ktime_get(); +} + +#else /* CONFIG_DEBUG_FS */ +# define r2net_init_nst(a, b, c, d, e) +# define r2net_set_nst_sock_time(a) +# define r2net_set_nst_send_time(a) +# define r2net_set_nst_status_time(a) +# define r2net_set_nst_sock_container(a, b) +# define r2net_set_nst_msg_id(a, b) +# define r2net_set_sock_timer(a) +# define r2net_set_data_ready_time(a) +# define r2net_set_advance_start_time(a) +# define r2net_set_advance_stop_time(a) +# define r2net_set_func_start_time(a) +# define r2net_set_func_stop_time(a) +#endif /* CONFIG_DEBUG_FS */ + +#ifdef CONFIG_RAMSTER_FS_STATS +static ktime_t r2net_get_func_run_time(struct r2net_sock_container *sc) +{ + return ktime_sub(sc->sc_tv_func_stop, sc->sc_tv_func_start); +} + +static void r2net_update_send_stats(struct r2net_send_tracking *nst, + struct r2net_sock_container *sc) +{ + sc->sc_tv_status_total = ktime_add(sc->sc_tv_status_total, + ktime_sub(ktime_get(), + nst->st_status_time)); + sc->sc_tv_send_total = ktime_add(sc->sc_tv_send_total, + ktime_sub(nst->st_status_time, + nst->st_send_time)); + sc->sc_tv_acquiry_total = ktime_add(sc->sc_tv_acquiry_total, + ktime_sub(nst->st_send_time, + nst->st_sock_time)); + sc->sc_send_count++; +} + +static void r2net_update_recv_stats(struct r2net_sock_container *sc) +{ + sc->sc_tv_process_total = ktime_add(sc->sc_tv_process_total, + r2net_get_func_run_time(sc)); + sc->sc_recv_count++; +} + +#else + +# define r2net_update_send_stats(a, b) + +# define r2net_update_recv_stats(sc) + +#endif /* CONFIG_RAMSTER_FS_STATS */ + +static inline int r2net_reconnect_delay(void) +{ + return r2nm_single_cluster->cl_reconnect_delay_ms; +} + +static inline int r2net_keepalive_delay(void) +{ + return r2nm_single_cluster->cl_keepalive_delay_ms; +} + +static inline int r2net_idle_timeout(void) +{ + return r2nm_single_cluster->cl_idle_timeout_ms; +} + +static inline int r2net_sys_err_to_errno(enum r2net_system_error err) +{ + int trans; + BUG_ON(err >= R2NET_ERR_MAX); + trans = r2net_sys_err_translations[err]; + + /* Just in case we mess up the translation table above */ + BUG_ON(err != R2NET_ERR_NONE && trans == 0); + return trans; +} + +struct r2net_node *r2net_nn_from_num(u8 node_num) +{ + BUG_ON(node_num >= ARRAY_SIZE(r2net_nodes)); + return &r2net_nodes[node_num]; +} + +static u8 r2net_num_from_nn(struct r2net_node *nn) +{ + BUG_ON(nn == NULL); + return nn - r2net_nodes; +} + +/* ------------------------------------------------------------ */ + +static int r2net_prep_nsw(struct r2net_node *nn, struct r2net_status_wait *nsw) +{ + int ret = 0; + + do { + if (!idr_pre_get(&nn->nn_status_idr, GFP_ATOMIC)) { + ret = -EAGAIN; + break; + } + spin_lock(&nn->nn_lock); + ret = idr_get_new(&nn->nn_status_idr, nsw, &nsw->ns_id); + if (ret == 0) + list_add_tail(&nsw->ns_node_item, + &nn->nn_status_list); + spin_unlock(&nn->nn_lock); + } while (ret == -EAGAIN); + + if (ret == 0) { + init_waitqueue_head(&nsw->ns_wq); + nsw->ns_sys_status = R2NET_ERR_NONE; + nsw->ns_status = 0; + } + + return ret; +} + +static void r2net_complete_nsw_locked(struct r2net_node *nn, + struct r2net_status_wait *nsw, + enum r2net_system_error sys_status, + s32 status) +{ + assert_spin_locked(&nn->nn_lock); + + if (!list_empty(&nsw->ns_node_item)) { + list_del_init(&nsw->ns_node_item); + nsw->ns_sys_status = sys_status; + nsw->ns_status = status; + idr_remove(&nn->nn_status_idr, nsw->ns_id); + wake_up(&nsw->ns_wq); + } +} + +static void r2net_complete_nsw(struct r2net_node *nn, + struct r2net_status_wait *nsw, + u64 id, enum r2net_system_error sys_status, + s32 status) +{ + spin_lock(&nn->nn_lock); + if (nsw == NULL) { + if (id > INT_MAX) + goto out; + + nsw = idr_find(&nn->nn_status_idr, id); + if (nsw == NULL) + goto out; + } + + r2net_complete_nsw_locked(nn, nsw, sys_status, status); + +out: + spin_unlock(&nn->nn_lock); + return; +} + +static void r2net_complete_nodes_nsw(struct r2net_node *nn) +{ + struct r2net_status_wait *nsw, *tmp; + unsigned int num_kills = 0; + + assert_spin_locked(&nn->nn_lock); + + list_for_each_entry_safe(nsw, tmp, &nn->nn_status_list, ns_node_item) { + r2net_complete_nsw_locked(nn, nsw, R2NET_ERR_DIED, 0); + num_kills++; + } + + mlog(0, "completed %d messages for node %u\n", num_kills, + r2net_num_from_nn(nn)); +} + +static int r2net_nsw_completed(struct r2net_node *nn, + struct r2net_status_wait *nsw) +{ + int completed; + spin_lock(&nn->nn_lock); + completed = list_empty(&nsw->ns_node_item); + spin_unlock(&nn->nn_lock); + return completed; +} + +/* ------------------------------------------------------------ */ + +static void sc_kref_release(struct kref *kref) +{ + struct r2net_sock_container *sc = container_of(kref, + struct r2net_sock_container, sc_kref); + BUG_ON(timer_pending(&sc->sc_idle_timeout)); + + sclog(sc, "releasing\n"); + + if (sc->sc_sock) { + sock_release(sc->sc_sock); + sc->sc_sock = NULL; + } + + r2nm_undepend_item(&sc->sc_node->nd_item); + r2nm_node_put(sc->sc_node); + sc->sc_node = NULL; + + r2net_debug_del_sc(sc); + kfree(sc); +} + +static void sc_put(struct r2net_sock_container *sc) +{ + sclog(sc, "put\n"); + kref_put(&sc->sc_kref, sc_kref_release); +} +static void sc_get(struct r2net_sock_container *sc) +{ + sclog(sc, "get\n"); + kref_get(&sc->sc_kref); +} +static struct r2net_sock_container *sc_alloc(struct r2nm_node *node) +{ + struct r2net_sock_container *sc, *ret = NULL; + struct page *page = NULL; + int status = 0; + + page = alloc_page(GFP_NOFS); + sc = kzalloc(sizeof(*sc), GFP_NOFS); + if (sc == NULL || page == NULL) + goto out; + + kref_init(&sc->sc_kref); + r2nm_node_get(node); + sc->sc_node = node; + + /* pin the node item of the remote node */ + status = r2nm_depend_item(&node->nd_item); + if (status) { + mlog_errno(status); + r2nm_node_put(node); + goto out; + } + INIT_WORK(&sc->sc_connect_work, r2net_sc_connect_completed); + INIT_WORK(&sc->sc_rx_work, r2net_rx_until_empty); + INIT_WORK(&sc->sc_shutdown_work, r2net_shutdown_sc); + INIT_DELAYED_WORK(&sc->sc_keepalive_work, r2net_sc_send_keep_req); + + init_timer(&sc->sc_idle_timeout); + sc->sc_idle_timeout.function = r2net_idle_timer; + sc->sc_idle_timeout.data = (unsigned long)sc; + + sclog(sc, "alloced\n"); + + ret = sc; + sc->sc_page = page; + r2net_debug_add_sc(sc); + sc = NULL; + page = NULL; + +out: + if (page) + __free_page(page); + kfree(sc); + + return ret; +} + +/* ------------------------------------------------------------ */ + +static void r2net_sc_queue_work(struct r2net_sock_container *sc, + struct work_struct *work) +{ + sc_get(sc); + if (!queue_work(r2net_wq, work)) + sc_put(sc); +} +static void r2net_sc_queue_delayed_work(struct r2net_sock_container *sc, + struct delayed_work *work, + int delay) +{ + sc_get(sc); + if (!queue_delayed_work(r2net_wq, work, delay)) + sc_put(sc); +} +static void r2net_sc_cancel_delayed_work(struct r2net_sock_container *sc, + struct delayed_work *work) +{ + if (cancel_delayed_work(work)) + sc_put(sc); +} + +static atomic_t r2net_connected_peers = ATOMIC_INIT(0); + +int r2net_num_connected_peers(void) +{ + return atomic_read(&r2net_connected_peers); +} + +static void r2net_set_nn_state(struct r2net_node *nn, + struct r2net_sock_container *sc, + unsigned valid, int err) +{ + int was_valid = nn->nn_sc_valid; + int was_err = nn->nn_persistent_error; + struct r2net_sock_container *old_sc = nn->nn_sc; + + assert_spin_locked(&nn->nn_lock); + + if (old_sc && !sc) + atomic_dec(&r2net_connected_peers); + else if (!old_sc && sc) + atomic_inc(&r2net_connected_peers); + + /* the node num comparison and single connect/accept path should stop + * an non-null sc from being overwritten with another */ + BUG_ON(sc && nn->nn_sc && nn->nn_sc != sc); + mlog_bug_on_msg(err && valid, "err %d valid %u\n", err, valid); + mlog_bug_on_msg(valid && !sc, "valid %u sc %p\n", valid, sc); + + if (was_valid && !valid && err == 0) + err = -ENOTCONN; + + mlog(ML_CONN, "node %u sc: %p -> %p, valid %u -> %u, err %d -> %d\n", + r2net_num_from_nn(nn), nn->nn_sc, sc, nn->nn_sc_valid, valid, + nn->nn_persistent_error, err); + + nn->nn_sc = sc; + nn->nn_sc_valid = valid ? 1 : 0; + nn->nn_persistent_error = err; + + /* mirrors r2net_tx_can_proceed() */ + if (nn->nn_persistent_error || nn->nn_sc_valid) + wake_up(&nn->nn_sc_wq); + + if (!was_err && nn->nn_persistent_error) { + queue_delayed_work(r2net_wq, &nn->nn_still_up, + msecs_to_jiffies(R2NET_QUORUM_DELAY_MS)); + } + + if (was_valid && !valid) { + pr_notice("ramster: No longer connected to " SC_NODEF_FMT "\n", + old_sc->sc_node->nd_name, old_sc->sc_node->nd_num, + &old_sc->sc_node->nd_ipv4_address, + ntohs(old_sc->sc_node->nd_ipv4_port)); + r2net_complete_nodes_nsw(nn); + } + + if (!was_valid && valid) { + cancel_delayed_work(&nn->nn_connect_expired); + pr_notice("ramster: %s " SC_NODEF_FMT "\n", + r2nm_this_node() > sc->sc_node->nd_num ? + "Connected to" : "Accepted connection from", + sc->sc_node->nd_name, sc->sc_node->nd_num, + &sc->sc_node->nd_ipv4_address, + ntohs(sc->sc_node->nd_ipv4_port)); + } + + /* trigger the connecting worker func as long as we're not valid, + * it will back off if it shouldn't connect. This can be called + * from node config teardown and so needs to be careful about + * the work queue actually being up. */ + if (!valid && r2net_wq) { + unsigned long delay; + /* delay if we're within a RECONNECT_DELAY of the + * last attempt */ + delay = (nn->nn_last_connect_attempt + + msecs_to_jiffies(r2net_reconnect_delay())) + - jiffies; + if (delay > msecs_to_jiffies(r2net_reconnect_delay())) + delay = 0; + mlog(ML_CONN, "queueing conn attempt in %lu jiffies\n", delay); + queue_delayed_work(r2net_wq, &nn->nn_connect_work, delay); + + /* + * Delay the expired work after idle timeout. + * + * We might have lots of failed connection attempts that run + * through here but we only cancel the connect_expired work when + * a connection attempt succeeds. So only the first enqueue of + * the connect_expired work will do anything. The rest will see + * that it's already queued and do nothing. + */ + delay += msecs_to_jiffies(r2net_idle_timeout()); + queue_delayed_work(r2net_wq, &nn->nn_connect_expired, delay); + } + + /* keep track of the nn's sc ref for the caller */ + if ((old_sc == NULL) && sc) + sc_get(sc); + if (old_sc && (old_sc != sc)) { + r2net_sc_queue_work(old_sc, &old_sc->sc_shutdown_work); + sc_put(old_sc); + } +} + +/* see r2net_register_callbacks() */ +static void r2net_data_ready(struct sock *sk, int bytes) +{ + void (*ready)(struct sock *sk, int bytes); + + read_lock(&sk->sk_callback_lock); + if (sk->sk_user_data) { + struct r2net_sock_container *sc = sk->sk_user_data; + sclog(sc, "data_ready hit\n"); + r2net_set_data_ready_time(sc); + r2net_sc_queue_work(sc, &sc->sc_rx_work); + ready = sc->sc_data_ready; + } else { + ready = sk->sk_data_ready; + } + read_unlock(&sk->sk_callback_lock); + + ready(sk, bytes); +} + +/* see r2net_register_callbacks() */ +static void r2net_state_change(struct sock *sk) +{ + void (*state_change)(struct sock *sk); + struct r2net_sock_container *sc; + + read_lock(&sk->sk_callback_lock); + sc = sk->sk_user_data; + if (sc == NULL) { + state_change = sk->sk_state_change; + goto out; + } + + sclog(sc, "state_change to %d\n", sk->sk_state); + + state_change = sc->sc_state_change; + + switch (sk->sk_state) { + + /* ignore connecting sockets as they make progress */ + case TCP_SYN_SENT: + case TCP_SYN_RECV: + break; + case TCP_ESTABLISHED: + r2net_sc_queue_work(sc, &sc->sc_connect_work); + break; + default: + pr_info("ramster: Connection to " + SC_NODEF_FMT " shutdown, state %d\n", + sc->sc_node->nd_name, sc->sc_node->nd_num, + &sc->sc_node->nd_ipv4_address, + ntohs(sc->sc_node->nd_ipv4_port), sk->sk_state); + r2net_sc_queue_work(sc, &sc->sc_shutdown_work); + break; + + } +out: + read_unlock(&sk->sk_callback_lock); + state_change(sk); +} + +/* + * we register callbacks so we can queue work on events before calling + * the original callbacks. our callbacks are careful to test user_data + * to discover when they've reaced with r2net_unregister_callbacks(). + */ +static void r2net_register_callbacks(struct sock *sk, + struct r2net_sock_container *sc) +{ + write_lock_bh(&sk->sk_callback_lock); + + /* accepted sockets inherit the old listen socket data ready */ + if (sk->sk_data_ready == r2net_listen_data_ready) { + sk->sk_data_ready = sk->sk_user_data; + sk->sk_user_data = NULL; + } + + BUG_ON(sk->sk_user_data != NULL); + sk->sk_user_data = sc; + sc_get(sc); + + sc->sc_data_ready = sk->sk_data_ready; + sc->sc_state_change = sk->sk_state_change; + sk->sk_data_ready = r2net_data_ready; + sk->sk_state_change = r2net_state_change; + + mutex_init(&sc->sc_send_lock); + + write_unlock_bh(&sk->sk_callback_lock); +} + +static int r2net_unregister_callbacks(struct sock *sk, + struct r2net_sock_container *sc) +{ + int ret = 0; + + write_lock_bh(&sk->sk_callback_lock); + if (sk->sk_user_data == sc) { + ret = 1; + sk->sk_user_data = NULL; + sk->sk_data_ready = sc->sc_data_ready; + sk->sk_state_change = sc->sc_state_change; + } + write_unlock_bh(&sk->sk_callback_lock); + + return ret; +} + +/* + * this is a little helper that is called by callers who have seen a problem + * with an sc and want to detach it from the nn if someone already hasn't beat + * them to it. if an error is given then the shutdown will be persistent + * and pending transmits will be canceled. + */ +static void r2net_ensure_shutdown(struct r2net_node *nn, + struct r2net_sock_container *sc, + int err) +{ + spin_lock(&nn->nn_lock); + if (nn->nn_sc == sc) + r2net_set_nn_state(nn, NULL, 0, err); + spin_unlock(&nn->nn_lock); +} + +/* + * This work queue function performs the blocking parts of socket shutdown. A + * few paths lead here. set_nn_state will trigger this callback if it sees an + * sc detached from the nn. state_change will also trigger this callback + * directly when it sees errors. In that case we need to call set_nn_state + * ourselves as state_change couldn't get the nn_lock and call set_nn_state + * itself. + */ +static void r2net_shutdown_sc(struct work_struct *work) +{ + struct r2net_sock_container *sc = + container_of(work, struct r2net_sock_container, + sc_shutdown_work); + struct r2net_node *nn = r2net_nn_from_num(sc->sc_node->nd_num); + + sclog(sc, "shutting down\n"); + + /* drop the callbacks ref and call shutdown only once */ + if (r2net_unregister_callbacks(sc->sc_sock->sk, sc)) { + /* we shouldn't flush as we're in the thread, the + * races with pending sc work structs are harmless */ + del_timer_sync(&sc->sc_idle_timeout); + r2net_sc_cancel_delayed_work(sc, &sc->sc_keepalive_work); + sc_put(sc); + kernel_sock_shutdown(sc->sc_sock, SHUT_RDWR); + } + + /* not fatal so failed connects before the other guy has our + * heartbeat can be retried */ + r2net_ensure_shutdown(nn, sc, 0); + sc_put(sc); +} + +/* ------------------------------------------------------------ */ + +static int r2net_handler_cmp(struct r2net_msg_handler *nmh, u32 msg_type, + u32 key) +{ + int ret = memcmp(&nmh->nh_key, &key, sizeof(key)); + + if (ret == 0) + ret = memcmp(&nmh->nh_msg_type, &msg_type, sizeof(msg_type)); + + return ret; +} + +static struct r2net_msg_handler * +r2net_handler_tree_lookup(u32 msg_type, u32 key, struct rb_node ***ret_p, + struct rb_node **ret_parent) +{ + struct rb_node **p = &r2net_handler_tree.rb_node; + struct rb_node *parent = NULL; + struct r2net_msg_handler *nmh, *ret = NULL; + int cmp; + + while (*p) { + parent = *p; + nmh = rb_entry(parent, struct r2net_msg_handler, nh_node); + cmp = r2net_handler_cmp(nmh, msg_type, key); + + if (cmp < 0) + p = &(*p)->rb_left; + else if (cmp > 0) + p = &(*p)->rb_right; + else { + ret = nmh; + break; + } + } + + if (ret_p != NULL) + *ret_p = p; + if (ret_parent != NULL) + *ret_parent = parent; + + return ret; +} + +static void r2net_handler_kref_release(struct kref *kref) +{ + struct r2net_msg_handler *nmh; + nmh = container_of(kref, struct r2net_msg_handler, nh_kref); + + kfree(nmh); +} + +static void r2net_handler_put(struct r2net_msg_handler *nmh) +{ + kref_put(&nmh->nh_kref, r2net_handler_kref_release); +} + +/* max_len is protection for the handler func. incoming messages won't + * be given to the handler if their payload is longer than the max. */ +int r2net_register_handler(u32 msg_type, u32 key, u32 max_len, + r2net_msg_handler_func *func, void *data, + r2net_post_msg_handler_func *post_func, + struct list_head *unreg_list) +{ + struct r2net_msg_handler *nmh = NULL; + struct rb_node **p, *parent; + int ret = 0; + + if (max_len > R2NET_MAX_PAYLOAD_BYTES) { + mlog(0, "max_len for message handler out of range: %u\n", + max_len); + ret = -EINVAL; + goto out; + } + + if (!msg_type) { + mlog(0, "no message type provided: %u, %p\n", msg_type, func); + ret = -EINVAL; + goto out; + + } + if (!func) { + mlog(0, "no message handler provided: %u, %p\n", + msg_type, func); + ret = -EINVAL; + goto out; + } + + nmh = kzalloc(sizeof(struct r2net_msg_handler), GFP_NOFS); + if (nmh == NULL) { + ret = -ENOMEM; + goto out; + } + + nmh->nh_func = func; + nmh->nh_func_data = data; + nmh->nh_post_func = post_func; + nmh->nh_msg_type = msg_type; + nmh->nh_max_len = max_len; + nmh->nh_key = key; + /* the tree and list get this ref.. they're both removed in + * unregister when this ref is dropped */ + kref_init(&nmh->nh_kref); + INIT_LIST_HEAD(&nmh->nh_unregister_item); + + write_lock(&r2net_handler_lock); + if (r2net_handler_tree_lookup(msg_type, key, &p, &parent)) + ret = -EEXIST; + else { + rb_link_node(&nmh->nh_node, parent, p); + rb_insert_color(&nmh->nh_node, &r2net_handler_tree); + list_add_tail(&nmh->nh_unregister_item, unreg_list); + + mlog(ML_TCP, "registered handler func %p type %u key %08x\n", + func, msg_type, key); + /* we've had some trouble with handlers seemingly vanishing. */ + mlog_bug_on_msg(r2net_handler_tree_lookup(msg_type, key, &p, + &parent) == NULL, + "couldn't find handler we *just* registered " + "for type %u key %08x\n", msg_type, key); + } + write_unlock(&r2net_handler_lock); + if (ret) + goto out; + +out: + if (ret) + kfree(nmh); + + return ret; +} +EXPORT_SYMBOL_GPL(r2net_register_handler); + +void r2net_unregister_handler_list(struct list_head *list) +{ + struct r2net_msg_handler *nmh, *n; + + write_lock(&r2net_handler_lock); + list_for_each_entry_safe(nmh, n, list, nh_unregister_item) { + mlog(ML_TCP, "unregistering handler func %p type %u key %08x\n", + nmh->nh_func, nmh->nh_msg_type, nmh->nh_key); + rb_erase(&nmh->nh_node, &r2net_handler_tree); + list_del_init(&nmh->nh_unregister_item); + kref_put(&nmh->nh_kref, r2net_handler_kref_release); + } + write_unlock(&r2net_handler_lock); +} +EXPORT_SYMBOL_GPL(r2net_unregister_handler_list); + +static struct r2net_msg_handler *r2net_handler_get(u32 msg_type, u32 key) +{ + struct r2net_msg_handler *nmh; + + read_lock(&r2net_handler_lock); + nmh = r2net_handler_tree_lookup(msg_type, key, NULL, NULL); + if (nmh) + kref_get(&nmh->nh_kref); + read_unlock(&r2net_handler_lock); + + return nmh; +} + +/* ------------------------------------------------------------ */ + +static int r2net_recv_tcp_msg(struct socket *sock, void *data, size_t len) +{ + int ret; + mm_segment_t oldfs; + struct kvec vec = { + .iov_len = len, + .iov_base = data, + }; + struct msghdr msg = { + .msg_iovlen = 1, + .msg_iov = (struct iovec *)&vec, + .msg_flags = MSG_DONTWAIT, + }; + + oldfs = get_fs(); + set_fs(get_ds()); + ret = sock_recvmsg(sock, &msg, len, msg.msg_flags); + set_fs(oldfs); + + return ret; +} + +static int r2net_send_tcp_msg(struct socket *sock, struct kvec *vec, + size_t veclen, size_t total) +{ + int ret; + mm_segment_t oldfs; + struct msghdr msg = { + .msg_iov = (struct iovec *)vec, + .msg_iovlen = veclen, + }; + + if (sock == NULL) { + ret = -EINVAL; + goto out; + } + + oldfs = get_fs(); + set_fs(get_ds()); + ret = sock_sendmsg(sock, &msg, total); + set_fs(oldfs); + if (ret != total) { + mlog(ML_ERROR, "sendmsg returned %d instead of %zu\n", ret, + total); + if (ret >= 0) + ret = -EPIPE; /* should be smarter, I bet */ + goto out; + } + + ret = 0; +out: + if (ret < 0) + mlog(0, "returning error: %d\n", ret); + return ret; +} + +static void r2net_sendpage(struct r2net_sock_container *sc, + void *kmalloced_virt, + size_t size) +{ + struct r2net_node *nn = r2net_nn_from_num(sc->sc_node->nd_num); + ssize_t ret; + + while (1) { + mutex_lock(&sc->sc_send_lock); + ret = sc->sc_sock->ops->sendpage(sc->sc_sock, + virt_to_page(kmalloced_virt), + (long)kmalloced_virt & ~PAGE_MASK, + size, MSG_DONTWAIT); + mutex_unlock(&sc->sc_send_lock); + if (ret == size) + break; + if (ret == (ssize_t)-EAGAIN) { + mlog(0, "sendpage of size %zu to " SC_NODEF_FMT + " returned EAGAIN\n", size, sc->sc_node->nd_name, + sc->sc_node->nd_num, + &sc->sc_node->nd_ipv4_address, + ntohs(sc->sc_node->nd_ipv4_port)); + cond_resched(); + continue; + } + mlog(ML_ERROR, "sendpage of size %zu to " SC_NODEF_FMT + " failed with %zd\n", size, sc->sc_node->nd_name, + sc->sc_node->nd_num, &sc->sc_node->nd_ipv4_address, + ntohs(sc->sc_node->nd_ipv4_port), ret); + r2net_ensure_shutdown(nn, sc, 0); + break; + } +} + +static void r2net_init_msg(struct r2net_msg *msg, u16 data_len, + u16 msg_type, u32 key) +{ + memset(msg, 0, sizeof(struct r2net_msg)); + msg->magic = cpu_to_be16(R2NET_MSG_MAGIC); + msg->data_len = cpu_to_be16(data_len); + msg->msg_type = cpu_to_be16(msg_type); + msg->sys_status = cpu_to_be32(R2NET_ERR_NONE); + msg->status = 0; + msg->key = cpu_to_be32(key); +} + +static int r2net_tx_can_proceed(struct r2net_node *nn, + struct r2net_sock_container **sc_ret, + int *error) +{ + int ret = 0; + + spin_lock(&nn->nn_lock); + if (nn->nn_persistent_error) { + ret = 1; + *sc_ret = NULL; + *error = nn->nn_persistent_error; + } else if (nn->nn_sc_valid) { + kref_get(&nn->nn_sc->sc_kref); + + ret = 1; + *sc_ret = nn->nn_sc; + *error = 0; + } + spin_unlock(&nn->nn_lock); + + return ret; +} + +/* Get a map of all nodes to which this node is currently connected to */ +void r2net_fill_node_map(unsigned long *map, unsigned bytes) +{ + struct r2net_sock_container *sc; + int node, ret; + + BUG_ON(bytes < (BITS_TO_LONGS(R2NM_MAX_NODES) * sizeof(unsigned long))); + + memset(map, 0, bytes); + for (node = 0; node < R2NM_MAX_NODES; ++node) { + r2net_tx_can_proceed(r2net_nn_from_num(node), &sc, &ret); + if (!ret) { + set_bit(node, map); + sc_put(sc); + } + } +} +EXPORT_SYMBOL_GPL(r2net_fill_node_map); + +int r2net_send_message_vec(u32 msg_type, u32 key, struct kvec *caller_vec, + size_t caller_veclen, u8 target_node, int *status) +{ + int ret = 0; + struct r2net_msg *msg = NULL; + size_t veclen, caller_bytes = 0; + struct kvec *vec = NULL; + struct r2net_sock_container *sc = NULL; + struct r2net_node *nn = r2net_nn_from_num(target_node); + struct r2net_status_wait nsw = { + .ns_node_item = LIST_HEAD_INIT(nsw.ns_node_item), + }; + struct r2net_send_tracking nst; + + /* this may be a general bug fix */ + init_waitqueue_head(&nsw.ns_wq); + + r2net_init_nst(&nst, msg_type, key, current, target_node); + + if (r2net_wq == NULL) { + mlog(0, "attempt to tx without r2netd running\n"); + ret = -ESRCH; + goto out; + } + + if (caller_veclen == 0) { + mlog(0, "bad kvec array length\n"); + ret = -EINVAL; + goto out; + } + + caller_bytes = iov_length((struct iovec *)caller_vec, caller_veclen); + if (caller_bytes > R2NET_MAX_PAYLOAD_BYTES) { + mlog(0, "total payload len %zu too large\n", caller_bytes); + ret = -EINVAL; + goto out; + } + + if (target_node == r2nm_this_node()) { + ret = -ELOOP; + goto out; + } + + r2net_debug_add_nst(&nst); + + r2net_set_nst_sock_time(&nst); + + wait_event(nn->nn_sc_wq, r2net_tx_can_proceed(nn, &sc, &ret)); + if (ret) + goto out; + + r2net_set_nst_sock_container(&nst, sc); + + veclen = caller_veclen + 1; + vec = kmalloc(sizeof(struct kvec) * veclen, GFP_ATOMIC); + if (vec == NULL) { + mlog(0, "failed to %zu element kvec!\n", veclen); + ret = -ENOMEM; + goto out; + } + + msg = kmalloc(sizeof(struct r2net_msg), GFP_ATOMIC); + if (!msg) { + mlog(0, "failed to allocate a r2net_msg!\n"); + ret = -ENOMEM; + goto out; + } + + r2net_init_msg(msg, caller_bytes, msg_type, key); + + vec[0].iov_len = sizeof(struct r2net_msg); + vec[0].iov_base = msg; + memcpy(&vec[1], caller_vec, caller_veclen * sizeof(struct kvec)); + + ret = r2net_prep_nsw(nn, &nsw); + if (ret) + goto out; + + msg->msg_num = cpu_to_be32(nsw.ns_id); + r2net_set_nst_msg_id(&nst, nsw.ns_id); + + r2net_set_nst_send_time(&nst); + + /* finally, convert the message header to network byte-order + * and send */ + mutex_lock(&sc->sc_send_lock); + ret = r2net_send_tcp_msg(sc->sc_sock, vec, veclen, + sizeof(struct r2net_msg) + caller_bytes); + mutex_unlock(&sc->sc_send_lock); + msglog(msg, "sending returned %d\n", ret); + if (ret < 0) { + mlog(0, "error returned from r2net_send_tcp_msg=%d\n", ret); + goto out; + } + + /* wait on other node's handler */ + r2net_set_nst_status_time(&nst); + wait_event(nsw.ns_wq, r2net_nsw_completed(nn, &nsw) || + nn->nn_persistent_error || !nn->nn_sc_valid); + + r2net_update_send_stats(&nst, sc); + + /* Note that we avoid overwriting the callers status return + * variable if a system error was reported on the other + * side. Callers beware. */ + ret = r2net_sys_err_to_errno(nsw.ns_sys_status); + if (status && !ret) + *status = nsw.ns_status; + + mlog(0, "woken, returning system status %d, user status %d\n", + ret, nsw.ns_status); +out: + r2net_debug_del_nst(&nst); /* must be before dropping sc and node */ + if (sc) + sc_put(sc); + kfree(vec); + kfree(msg); + r2net_complete_nsw(nn, &nsw, 0, 0, 0); + return ret; +} +EXPORT_SYMBOL_GPL(r2net_send_message_vec); + +int r2net_send_message(u32 msg_type, u32 key, void *data, u32 len, + u8 target_node, int *status) +{ + struct kvec vec = { + .iov_base = data, + .iov_len = len, + }; + return r2net_send_message_vec(msg_type, key, &vec, 1, + target_node, status); +} +EXPORT_SYMBOL_GPL(r2net_send_message); + +static int r2net_send_status_magic(struct socket *sock, struct r2net_msg *hdr, + enum r2net_system_error syserr, int err) +{ + struct kvec vec = { + .iov_base = hdr, + .iov_len = sizeof(struct r2net_msg), + }; + + BUG_ON(syserr >= R2NET_ERR_MAX); + + /* leave other fields intact from the incoming message, msg_num + * in particular */ + hdr->sys_status = cpu_to_be32(syserr); + hdr->status = cpu_to_be32(err); + /* twiddle the magic */ + hdr->magic = cpu_to_be16(R2NET_MSG_STATUS_MAGIC); + hdr->data_len = 0; + + msglog(hdr, "about to send status magic %d\n", err); + /* hdr has been in host byteorder this whole time */ + return r2net_send_tcp_msg(sock, &vec, 1, sizeof(struct r2net_msg)); +} + +/* + * "data magic" is a long version of "status magic" where the message + * payload actually contains data to be passed in reply to certain messages + */ +static int r2net_send_data_magic(struct r2net_sock_container *sc, + struct r2net_msg *hdr, + void *data, size_t data_len, + enum r2net_system_error syserr, int err) +{ + struct kvec vec[2]; + int ret; + + vec[0].iov_base = hdr; + vec[0].iov_len = sizeof(struct r2net_msg); + vec[1].iov_base = data; + vec[1].iov_len = data_len; + + BUG_ON(syserr >= R2NET_ERR_MAX); + + /* leave other fields intact from the incoming message, msg_num + * in particular */ + hdr->sys_status = cpu_to_be32(syserr); + hdr->status = cpu_to_be32(err); + hdr->magic = cpu_to_be16(R2NET_MSG_DATA_MAGIC); /* twiddle magic */ + hdr->data_len = cpu_to_be16(data_len); + + msglog(hdr, "about to send data magic %d\n", err); + /* hdr has been in host byteorder this whole time */ + ret = r2net_send_tcp_msg(sc->sc_sock, vec, 2, + sizeof(struct r2net_msg) + data_len); + return ret; +} + +/* + * called by a message handler to convert an otherwise normal reply + * message into a "data magic" message + */ +void r2net_force_data_magic(struct r2net_msg *hdr, u16 msgtype, u32 msgkey) +{ + hdr->magic = cpu_to_be16(R2NET_MSG_DATA_MAGIC); + hdr->msg_type = cpu_to_be16(msgtype); + hdr->key = cpu_to_be32(msgkey); +} + +/* this returns -errno if the header was unknown or too large, etc. + * after this is called the buffer us reused for the next message */ +static int r2net_process_message(struct r2net_sock_container *sc, + struct r2net_msg *hdr) +{ + struct r2net_node *nn = r2net_nn_from_num(sc->sc_node->nd_num); + int ret = 0, handler_status; + enum r2net_system_error syserr; + struct r2net_msg_handler *nmh = NULL; + void *ret_data = NULL; + int data_magic = 0; + + msglog(hdr, "processing message\n"); + + r2net_sc_postpone_idle(sc); + + switch (be16_to_cpu(hdr->magic)) { + + case R2NET_MSG_STATUS_MAGIC: + /* special type for returning message status */ + r2net_complete_nsw(nn, NULL, be32_to_cpu(hdr->msg_num), + be32_to_cpu(hdr->sys_status), + be32_to_cpu(hdr->status)); + goto out; + case R2NET_MSG_KEEP_REQ_MAGIC: + r2net_sendpage(sc, r2net_keep_resp, sizeof(*r2net_keep_resp)); + goto out; + case R2NET_MSG_KEEP_RESP_MAGIC: + goto out; + case R2NET_MSG_MAGIC: + break; + case R2NET_MSG_DATA_MAGIC: + /* + * unlike a normal status magic, a data magic DOES + * (MUST) have a handler, so the control flow is + * a little funky here as a result + */ + data_magic = 1; + break; + default: + msglog(hdr, "bad magic\n"); + ret = -EINVAL; + goto out; + break; + } + + /* find a handler for it */ + handler_status = 0; + nmh = r2net_handler_get(be16_to_cpu(hdr->msg_type), + be32_to_cpu(hdr->key)); + if (!nmh) { + mlog(ML_TCP, "couldn't find handler for type %u key %08x\n", + be16_to_cpu(hdr->msg_type), be32_to_cpu(hdr->key)); + syserr = R2NET_ERR_NO_HNDLR; + goto out_respond; + } + + syserr = R2NET_ERR_NONE; + + if (be16_to_cpu(hdr->data_len) > nmh->nh_max_len) + syserr = R2NET_ERR_OVERFLOW; + + if (syserr != R2NET_ERR_NONE) { + pr_err("ramster_r2net, message length problem\n"); + goto out_respond; + } + + r2net_set_func_start_time(sc); + sc->sc_msg_key = be32_to_cpu(hdr->key); + sc->sc_msg_type = be16_to_cpu(hdr->msg_type); + handler_status = (nmh->nh_func)(hdr, sizeof(struct r2net_msg) + + be16_to_cpu(hdr->data_len), + nmh->nh_func_data, &ret_data); + if (data_magic) { + /* + * handler handled data sent in reply to request + * so complete the transaction + */ + r2net_complete_nsw(nn, NULL, be32_to_cpu(hdr->msg_num), + be32_to_cpu(hdr->sys_status), handler_status); + goto out; + } + /* + * handler changed magic to DATA_MAGIC to reply to request for data, + * implies ret_data points to data to return and handler_status + * is the number of bytes of data + */ + if (be16_to_cpu(hdr->magic) == R2NET_MSG_DATA_MAGIC) { + ret = r2net_send_data_magic(sc, hdr, + ret_data, handler_status, + syserr, 0); + hdr = NULL; + mlog(0, "sending data reply %d, syserr %d returned %d\n", + handler_status, syserr, ret); + r2net_set_func_stop_time(sc); + + r2net_update_recv_stats(sc); + goto out; + } + r2net_set_func_stop_time(sc); + + r2net_update_recv_stats(sc); + +out_respond: + /* this destroys the hdr, so don't use it after this */ + mutex_lock(&sc->sc_send_lock); + ret = r2net_send_status_magic(sc->sc_sock, hdr, syserr, + handler_status); + mutex_unlock(&sc->sc_send_lock); + hdr = NULL; + mlog(0, "sending handler status %d, syserr %d returned %d\n", + handler_status, syserr, ret); + + if (nmh) { + BUG_ON(ret_data != NULL && nmh->nh_post_func == NULL); + if (nmh->nh_post_func) + (nmh->nh_post_func)(handler_status, nmh->nh_func_data, + ret_data); + } + +out: + if (nmh) + r2net_handler_put(nmh); + return ret; +} + +static int r2net_check_handshake(struct r2net_sock_container *sc) +{ + struct r2net_handshake *hand = page_address(sc->sc_page); + struct r2net_node *nn = r2net_nn_from_num(sc->sc_node->nd_num); + + if (hand->protocol_version != cpu_to_be64(R2NET_PROTOCOL_VERSION)) { + pr_notice("ramster: " SC_NODEF_FMT " Advertised net " + "protocol version %llu but %llu is required. " + "Disconnecting.\n", sc->sc_node->nd_name, + sc->sc_node->nd_num, &sc->sc_node->nd_ipv4_address, + ntohs(sc->sc_node->nd_ipv4_port), + (unsigned long long)be64_to_cpu(hand->protocol_version), + R2NET_PROTOCOL_VERSION); + + /* don't bother reconnecting if its the wrong version. */ + r2net_ensure_shutdown(nn, sc, -ENOTCONN); + return -1; + } + + /* + * Ensure timeouts are consistent with other nodes, otherwise + * we can end up with one node thinking that the other must be down, + * but isn't. This can ultimately cause corruption. + */ + if (be32_to_cpu(hand->r2net_idle_timeout_ms) != + r2net_idle_timeout()) { + pr_notice("ramster: " SC_NODEF_FMT " uses a network " + "idle timeout of %u ms, but we use %u ms locally. " + "Disconnecting.\n", sc->sc_node->nd_name, + sc->sc_node->nd_num, &sc->sc_node->nd_ipv4_address, + ntohs(sc->sc_node->nd_ipv4_port), + be32_to_cpu(hand->r2net_idle_timeout_ms), + r2net_idle_timeout()); + r2net_ensure_shutdown(nn, sc, -ENOTCONN); + return -1; + } + + if (be32_to_cpu(hand->r2net_keepalive_delay_ms) != + r2net_keepalive_delay()) { + pr_notice("ramster: " SC_NODEF_FMT " uses a keepalive " + "delay of %u ms, but we use %u ms locally. " + "Disconnecting.\n", sc->sc_node->nd_name, + sc->sc_node->nd_num, &sc->sc_node->nd_ipv4_address, + ntohs(sc->sc_node->nd_ipv4_port), + be32_to_cpu(hand->r2net_keepalive_delay_ms), + r2net_keepalive_delay()); + r2net_ensure_shutdown(nn, sc, -ENOTCONN); + return -1; + } + + if (be32_to_cpu(hand->r2hb_heartbeat_timeout_ms) != + R2HB_MAX_WRITE_TIMEOUT_MS) { + pr_notice("ramster: " SC_NODEF_FMT " uses a heartbeat " + "timeout of %u ms, but we use %u ms locally. " + "Disconnecting.\n", sc->sc_node->nd_name, + sc->sc_node->nd_num, &sc->sc_node->nd_ipv4_address, + ntohs(sc->sc_node->nd_ipv4_port), + be32_to_cpu(hand->r2hb_heartbeat_timeout_ms), + R2HB_MAX_WRITE_TIMEOUT_MS); + r2net_ensure_shutdown(nn, sc, -ENOTCONN); + return -1; + } + + sc->sc_handshake_ok = 1; + + spin_lock(&nn->nn_lock); + /* set valid and queue the idle timers only if it hasn't been + * shut down already */ + if (nn->nn_sc == sc) { + r2net_sc_reset_idle_timer(sc); + atomic_set(&nn->nn_timeout, 0); + r2net_set_nn_state(nn, sc, 1, 0); + } + spin_unlock(&nn->nn_lock); + + /* shift everything up as though it wasn't there */ + sc->sc_page_off -= sizeof(struct r2net_handshake); + if (sc->sc_page_off) + memmove(hand, hand + 1, sc->sc_page_off); + + return 0; +} + +/* this demuxes the queued rx bytes into header or payload bits and calls + * handlers as each full message is read off the socket. it returns -error, + * == 0 eof, or > 0 for progress made.*/ +static int r2net_advance_rx(struct r2net_sock_container *sc) +{ + struct r2net_msg *hdr; + int ret = 0; + void *data; + size_t datalen; + + sclog(sc, "receiving\n"); + r2net_set_advance_start_time(sc); + + if (unlikely(sc->sc_handshake_ok == 0)) { + if (sc->sc_page_off < sizeof(struct r2net_handshake)) { + data = page_address(sc->sc_page) + sc->sc_page_off; + datalen = sizeof(struct r2net_handshake) - + sc->sc_page_off; + ret = r2net_recv_tcp_msg(sc->sc_sock, data, datalen); + if (ret > 0) + sc->sc_page_off += ret; + } + + if (sc->sc_page_off == sizeof(struct r2net_handshake)) { + r2net_check_handshake(sc); + if (unlikely(sc->sc_handshake_ok == 0)) + ret = -EPROTO; + } + goto out; + } + + /* do we need more header? */ + if (sc->sc_page_off < sizeof(struct r2net_msg)) { + data = page_address(sc->sc_page) + sc->sc_page_off; + datalen = sizeof(struct r2net_msg) - sc->sc_page_off; + ret = r2net_recv_tcp_msg(sc->sc_sock, data, datalen); + if (ret > 0) { + sc->sc_page_off += ret; + /* only swab incoming here.. we can + * only get here once as we cross from + * being under to over */ + if (sc->sc_page_off == sizeof(struct r2net_msg)) { + hdr = page_address(sc->sc_page); + if (be16_to_cpu(hdr->data_len) > + R2NET_MAX_PAYLOAD_BYTES) + ret = -EOVERFLOW; + WARN_ON_ONCE(ret == -EOVERFLOW); + } + } + if (ret <= 0) + goto out; + } + + if (sc->sc_page_off < sizeof(struct r2net_msg)) { + /* oof, still don't have a header */ + goto out; + } + + /* this was swabbed above when we first read it */ + hdr = page_address(sc->sc_page); + + msglog(hdr, "at page_off %zu\n", sc->sc_page_off); + + /* do we need more payload? */ + if (sc->sc_page_off - sizeof(struct r2net_msg) < + be16_to_cpu(hdr->data_len)) { + /* need more payload */ + data = page_address(sc->sc_page) + sc->sc_page_off; + datalen = (sizeof(struct r2net_msg) + + be16_to_cpu(hdr->data_len)) - + sc->sc_page_off; + ret = r2net_recv_tcp_msg(sc->sc_sock, data, datalen); + if (ret > 0) + sc->sc_page_off += ret; + if (ret <= 0) + goto out; + } + + if (sc->sc_page_off - sizeof(struct r2net_msg) == + be16_to_cpu(hdr->data_len)) { + /* we can only get here once, the first time we read + * the payload.. so set ret to progress if the handler + * works out. after calling this the message is toast */ + ret = r2net_process_message(sc, hdr); + if (ret == 0) + ret = 1; + sc->sc_page_off = 0; + } + +out: + sclog(sc, "ret = %d\n", ret); + r2net_set_advance_stop_time(sc); + return ret; +} + +/* this work func is triggerd by data ready. it reads until it can read no + * more. it interprets 0, eof, as fatal. if data_ready hits while we're doing + * our work the work struct will be marked and we'll be called again. */ +static void r2net_rx_until_empty(struct work_struct *work) +{ + struct r2net_sock_container *sc = + container_of(work, struct r2net_sock_container, sc_rx_work); + int ret; + + do { + ret = r2net_advance_rx(sc); + } while (ret > 0); + + if (ret <= 0 && ret != -EAGAIN) { + struct r2net_node *nn = r2net_nn_from_num(sc->sc_node->nd_num); + sclog(sc, "saw error %d, closing\n", ret); + /* not permanent so read failed handshake can retry */ + r2net_ensure_shutdown(nn, sc, 0); + } + sc_put(sc); +} + +static int r2net_set_nodelay(struct socket *sock) +{ + int ret, val = 1; + mm_segment_t oldfs; + + oldfs = get_fs(); + set_fs(KERNEL_DS); + + /* + * Dear unsuspecting programmer, + * + * Don't use sock_setsockopt() for SOL_TCP. It doesn't check its level + * argument and assumes SOL_SOCKET so, say, your TCP_NODELAY will + * silently turn into SO_DEBUG. + * + * Yours, + * Keeper of hilariously fragile interfaces. + */ + ret = sock->ops->setsockopt(sock, SOL_TCP, TCP_NODELAY, + (char __user *)&val, sizeof(val)); + + set_fs(oldfs); + return ret; +} + +static void r2net_initialize_handshake(void) +{ + r2net_hand->r2hb_heartbeat_timeout_ms = cpu_to_be32( + R2HB_MAX_WRITE_TIMEOUT_MS); + r2net_hand->r2net_idle_timeout_ms = cpu_to_be32(r2net_idle_timeout()); + r2net_hand->r2net_keepalive_delay_ms = cpu_to_be32( + r2net_keepalive_delay()); + r2net_hand->r2net_reconnect_delay_ms = cpu_to_be32( + r2net_reconnect_delay()); +} + +/* ------------------------------------------------------------ */ + +/* called when a connect completes and after a sock is accepted. the + * rx path will see the response and mark the sc valid */ +static void r2net_sc_connect_completed(struct work_struct *work) +{ + struct r2net_sock_container *sc = + container_of(work, struct r2net_sock_container, + sc_connect_work); + + mlog(ML_MSG, "sc sending handshake with ver %llu id %llx\n", + (unsigned long long)R2NET_PROTOCOL_VERSION, + (unsigned long long)be64_to_cpu(r2net_hand->connector_id)); + + r2net_initialize_handshake(); + r2net_sendpage(sc, r2net_hand, sizeof(*r2net_hand)); + sc_put(sc); +} + +/* this is called as a work_struct func. */ +static void r2net_sc_send_keep_req(struct work_struct *work) +{ + struct r2net_sock_container *sc = + container_of(work, struct r2net_sock_container, + sc_keepalive_work.work); + + r2net_sendpage(sc, r2net_keep_req, sizeof(*r2net_keep_req)); + sc_put(sc); +} + +/* socket shutdown does a del_timer_sync against this as it tears down. + * we can't start this timer until we've got to the point in sc buildup + * where shutdown is going to be involved */ +static void r2net_idle_timer(unsigned long data) +{ + struct r2net_sock_container *sc = (struct r2net_sock_container *)data; + struct r2net_node *nn = r2net_nn_from_num(sc->sc_node->nd_num); +#ifdef CONFIG_DEBUG_FS + unsigned long msecs = ktime_to_ms(ktime_get()) - + ktime_to_ms(sc->sc_tv_timer); +#else + unsigned long msecs = r2net_idle_timeout(); +#endif + + pr_notice("ramster: Connection to " SC_NODEF_FMT " has been " + "idle for %lu.%lu secs, shutting it down.\n", + sc->sc_node->nd_name, sc->sc_node->nd_num, + &sc->sc_node->nd_ipv4_address, ntohs(sc->sc_node->nd_ipv4_port), + msecs / 1000, msecs % 1000); + + /* + * Initialize the nn_timeout so that the next connection attempt + * will continue in r2net_start_connect. + */ + atomic_set(&nn->nn_timeout, 1); + r2net_sc_queue_work(sc, &sc->sc_shutdown_work); +} + +static void r2net_sc_reset_idle_timer(struct r2net_sock_container *sc) +{ + r2net_sc_cancel_delayed_work(sc, &sc->sc_keepalive_work); + r2net_sc_queue_delayed_work(sc, &sc->sc_keepalive_work, + msecs_to_jiffies(r2net_keepalive_delay())); + r2net_set_sock_timer(sc); + mod_timer(&sc->sc_idle_timeout, + jiffies + msecs_to_jiffies(r2net_idle_timeout())); +} + +static void r2net_sc_postpone_idle(struct r2net_sock_container *sc) +{ + /* Only push out an existing timer */ + if (timer_pending(&sc->sc_idle_timeout)) + r2net_sc_reset_idle_timer(sc); +} + +/* this work func is kicked whenever a path sets the nn state which doesn't + * have valid set. This includes seeing hb come up, losing a connection, + * having a connect attempt fail, etc. This centralizes the logic which decides + * if a connect attempt should be made or if we should give up and all future + * transmit attempts should fail */ +static void r2net_start_connect(struct work_struct *work) +{ + struct r2net_node *nn = + container_of(work, struct r2net_node, nn_connect_work.work); + struct r2net_sock_container *sc = NULL; + struct r2nm_node *node = NULL, *mynode = NULL; + struct socket *sock = NULL; + struct sockaddr_in myaddr = {0, }, remoteaddr = {0, }; + int ret = 0, stop; + unsigned int timeout; + + /* if we're greater we initiate tx, otherwise we accept */ + if (r2nm_this_node() <= r2net_num_from_nn(nn)) + goto out; + + /* watch for racing with tearing a node down */ + node = r2nm_get_node_by_num(r2net_num_from_nn(nn)); + if (node == NULL) { + ret = 0; + goto out; + } + + mynode = r2nm_get_node_by_num(r2nm_this_node()); + if (mynode == NULL) { + ret = 0; + goto out; + } + + spin_lock(&nn->nn_lock); + /* + * see if we already have one pending or have given up. + * For nn_timeout, it is set when we close the connection + * because of the idle time out. So it means that we have + * at least connected to that node successfully once, + * now try to connect to it again. + */ + timeout = atomic_read(&nn->nn_timeout); + stop = (nn->nn_sc || + (nn->nn_persistent_error && + (nn->nn_persistent_error != -ENOTCONN || timeout == 0))); + spin_unlock(&nn->nn_lock); + if (stop) + goto out; + + nn->nn_last_connect_attempt = jiffies; + + sc = sc_alloc(node); + if (sc == NULL) { + mlog(0, "couldn't allocate sc\n"); + ret = -ENOMEM; + goto out; + } + + ret = sock_create(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock); + if (ret < 0) { + mlog(0, "can't create socket: %d\n", ret); + goto out; + } + sc->sc_sock = sock; /* freed by sc_kref_release */ + + sock->sk->sk_allocation = GFP_ATOMIC; + + myaddr.sin_family = AF_INET; + myaddr.sin_addr.s_addr = mynode->nd_ipv4_address; + myaddr.sin_port = htons(0); /* any port */ + + ret = sock->ops->bind(sock, (struct sockaddr *)&myaddr, + sizeof(myaddr)); + if (ret) { + mlog(ML_ERROR, "bind failed with %d at address %pI4\n", + ret, &mynode->nd_ipv4_address); + goto out; + } + + ret = r2net_set_nodelay(sc->sc_sock); + if (ret) { + mlog(ML_ERROR, "setting TCP_NODELAY failed with %d\n", ret); + goto out; + } + + r2net_register_callbacks(sc->sc_sock->sk, sc); + + spin_lock(&nn->nn_lock); + /* handshake completion will set nn->nn_sc_valid */ + r2net_set_nn_state(nn, sc, 0, 0); + spin_unlock(&nn->nn_lock); + + remoteaddr.sin_family = AF_INET; + remoteaddr.sin_addr.s_addr = node->nd_ipv4_address; + remoteaddr.sin_port = node->nd_ipv4_port; + + ret = sc->sc_sock->ops->connect(sc->sc_sock, + (struct sockaddr *)&remoteaddr, + sizeof(remoteaddr), + O_NONBLOCK); + if (ret == -EINPROGRESS) + ret = 0; + +out: + if (ret) { + pr_notice("ramster: Connect attempt to " SC_NODEF_FMT + " failed with errno %d\n", sc->sc_node->nd_name, + sc->sc_node->nd_num, &sc->sc_node->nd_ipv4_address, + ntohs(sc->sc_node->nd_ipv4_port), ret); + /* 0 err so that another will be queued and attempted + * from set_nn_state */ + if (sc) + r2net_ensure_shutdown(nn, sc, 0); + } + if (sc) + sc_put(sc); + if (node) + r2nm_node_put(node); + if (mynode) + r2nm_node_put(mynode); + + return; +} + +static void r2net_connect_expired(struct work_struct *work) +{ + struct r2net_node *nn = + container_of(work, struct r2net_node, nn_connect_expired.work); + + spin_lock(&nn->nn_lock); + if (!nn->nn_sc_valid) { + pr_notice("ramster: No connection established with " + "node %u after %u.%u seconds, giving up.\n", + r2net_num_from_nn(nn), + r2net_idle_timeout() / 1000, + r2net_idle_timeout() % 1000); + + r2net_set_nn_state(nn, NULL, 0, -ENOTCONN); + } + spin_unlock(&nn->nn_lock); +} + +static void r2net_still_up(struct work_struct *work) +{ +} + +/* ------------------------------------------------------------ */ + +void r2net_disconnect_node(struct r2nm_node *node) +{ + struct r2net_node *nn = r2net_nn_from_num(node->nd_num); + + /* don't reconnect until it's heartbeating again */ + spin_lock(&nn->nn_lock); + atomic_set(&nn->nn_timeout, 0); + r2net_set_nn_state(nn, NULL, 0, -ENOTCONN); + spin_unlock(&nn->nn_lock); + + if (r2net_wq) { + cancel_delayed_work(&nn->nn_connect_expired); + cancel_delayed_work(&nn->nn_connect_work); + cancel_delayed_work(&nn->nn_still_up); + flush_workqueue(r2net_wq); + } +} + +static void r2net_hb_node_down_cb(struct r2nm_node *node, int node_num, + void *data) +{ + if (!node) + return; + + if (node_num != r2nm_this_node()) + r2net_disconnect_node(node); + + BUG_ON(atomic_read(&r2net_connected_peers) < 0); +} + +static void r2net_hb_node_up_cb(struct r2nm_node *node, int node_num, + void *data) +{ + struct r2net_node *nn = r2net_nn_from_num(node_num); + + BUG_ON(!node); + + /* ensure an immediate connect attempt */ + nn->nn_last_connect_attempt = jiffies - + (msecs_to_jiffies(r2net_reconnect_delay()) + 1); + + if (node_num != r2nm_this_node()) { + /* believe it or not, accept and node hearbeating testing + * can succeed for this node before we got here.. so + * only use set_nn_state to clear the persistent error + * if that hasn't already happened */ + spin_lock(&nn->nn_lock); + atomic_set(&nn->nn_timeout, 0); + if (nn->nn_persistent_error) + r2net_set_nn_state(nn, NULL, 0, 0); + spin_unlock(&nn->nn_lock); + } +} + +void r2net_unregister_hb_callbacks(void) +{ + r2hb_unregister_callback(NULL, &r2net_hb_up); + r2hb_unregister_callback(NULL, &r2net_hb_down); +} + +int r2net_register_hb_callbacks(void) +{ + int ret; + + r2hb_setup_callback(&r2net_hb_down, R2HB_NODE_DOWN_CB, + r2net_hb_node_down_cb, NULL, R2NET_HB_PRI); + r2hb_setup_callback(&r2net_hb_up, R2HB_NODE_UP_CB, + r2net_hb_node_up_cb, NULL, R2NET_HB_PRI); + + ret = r2hb_register_callback(NULL, &r2net_hb_up); + if (ret == 0) + ret = r2hb_register_callback(NULL, &r2net_hb_down); + + if (ret) + r2net_unregister_hb_callbacks(); + + return ret; +} + +/* ------------------------------------------------------------ */ + +static int r2net_accept_one(struct socket *sock) +{ + int ret, slen; + struct sockaddr_in sin; + struct socket *new_sock = NULL; + struct r2nm_node *node = NULL; + struct r2nm_node *local_node = NULL; + struct r2net_sock_container *sc = NULL; + struct r2net_node *nn; + + BUG_ON(sock == NULL); + ret = sock_create_lite(sock->sk->sk_family, sock->sk->sk_type, + sock->sk->sk_protocol, &new_sock); + if (ret) + goto out; + + new_sock->type = sock->type; + new_sock->ops = sock->ops; + ret = sock->ops->accept(sock, new_sock, O_NONBLOCK); + if (ret < 0) + goto out; + + new_sock->sk->sk_allocation = GFP_ATOMIC; + + ret = r2net_set_nodelay(new_sock); + if (ret) { + mlog(ML_ERROR, "setting TCP_NODELAY failed with %d\n", ret); + goto out; + } + + slen = sizeof(sin); + ret = new_sock->ops->getname(new_sock, (struct sockaddr *) &sin, + &slen, 1); + if (ret < 0) + goto out; + + node = r2nm_get_node_by_ip(sin.sin_addr.s_addr); + if (node == NULL) { + pr_notice("ramster: Attempt to connect from unknown " + "node at %pI4:%d\n", &sin.sin_addr.s_addr, + ntohs(sin.sin_port)); + ret = -EINVAL; + goto out; + } + + if (r2nm_this_node() >= node->nd_num) { + local_node = r2nm_get_node_by_num(r2nm_this_node()); + pr_notice("ramster: Unexpected connect attempt seen " + "at node '%s' (%u, %pI4:%d) from node '%s' (%u, " + "%pI4:%d)\n", local_node->nd_name, local_node->nd_num, + &(local_node->nd_ipv4_address), + ntohs(local_node->nd_ipv4_port), node->nd_name, + node->nd_num, &sin.sin_addr.s_addr, ntohs(sin.sin_port)); + ret = -EINVAL; + goto out; + } + + /* this happens all the time when the other node sees our heartbeat + * and tries to connect before we see their heartbeat */ + if (!r2hb_check_node_heartbeating_from_callback(node->nd_num)) { + mlog(ML_CONN, "attempt to connect from node '%s' at " + "%pI4:%d but it isn't heartbeating\n", + node->nd_name, &sin.sin_addr.s_addr, + ntohs(sin.sin_port)); + ret = -EINVAL; + goto out; + } + + nn = r2net_nn_from_num(node->nd_num); + + spin_lock(&nn->nn_lock); + if (nn->nn_sc) + ret = -EBUSY; + else + ret = 0; + spin_unlock(&nn->nn_lock); + if (ret) { + pr_notice("ramster: Attempt to connect from node '%s' " + "at %pI4:%d but it already has an open connection\n", + node->nd_name, &sin.sin_addr.s_addr, + ntohs(sin.sin_port)); + goto out; + } + + sc = sc_alloc(node); + if (sc == NULL) { + ret = -ENOMEM; + goto out; + } + + sc->sc_sock = new_sock; + new_sock = NULL; + + spin_lock(&nn->nn_lock); + atomic_set(&nn->nn_timeout, 0); + r2net_set_nn_state(nn, sc, 0, 0); + spin_unlock(&nn->nn_lock); + + r2net_register_callbacks(sc->sc_sock->sk, sc); + r2net_sc_queue_work(sc, &sc->sc_rx_work); + + r2net_initialize_handshake(); + r2net_sendpage(sc, r2net_hand, sizeof(*r2net_hand)); + +out: + if (new_sock) + sock_release(new_sock); + if (node) + r2nm_node_put(node); + if (local_node) + r2nm_node_put(local_node); + if (sc) + sc_put(sc); + return ret; +} + +static void r2net_accept_many(struct work_struct *work) +{ + struct socket *sock = r2net_listen_sock; + while (r2net_accept_one(sock) == 0) + cond_resched(); +} + +static void r2net_listen_data_ready(struct sock *sk, int bytes) +{ + void (*ready)(struct sock *sk, int bytes); + + read_lock(&sk->sk_callback_lock); + ready = sk->sk_user_data; + if (ready == NULL) { /* check for teardown race */ + ready = sk->sk_data_ready; + goto out; + } + + /* ->sk_data_ready is also called for a newly established child socket + * before it has been accepted and the acceptor has set up their + * data_ready.. we only want to queue listen work for our listening + * socket */ + if (sk->sk_state == TCP_LISTEN) { + mlog(ML_TCP, "bytes: %d\n", bytes); + queue_work(r2net_wq, &r2net_listen_work); + } + +out: + read_unlock(&sk->sk_callback_lock); + ready(sk, bytes); +} + +static int r2net_open_listening_sock(__be32 addr, __be16 port) +{ + struct socket *sock = NULL; + int ret; + struct sockaddr_in sin = { + .sin_family = PF_INET, + .sin_addr = { .s_addr = addr }, + .sin_port = port, + }; + + ret = sock_create(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock); + if (ret < 0) { + pr_err("ramster: Error %d while creating socket\n", ret); + goto out; + } + + sock->sk->sk_allocation = GFP_ATOMIC; + + write_lock_bh(&sock->sk->sk_callback_lock); + sock->sk->sk_user_data = sock->sk->sk_data_ready; + sock->sk->sk_data_ready = r2net_listen_data_ready; + write_unlock_bh(&sock->sk->sk_callback_lock); + + r2net_listen_sock = sock; + INIT_WORK(&r2net_listen_work, r2net_accept_many); + + sock->sk->sk_reuse = /* SK_CAN_REUSE FIXME FOR 3.4 */ 1; + ret = sock->ops->bind(sock, (struct sockaddr *)&sin, sizeof(sin)); + if (ret < 0) { + pr_err("ramster: Error %d while binding socket at %pI4:%u\n", + ret, &addr, ntohs(port)); + goto out; + } + + ret = sock->ops->listen(sock, 64); + if (ret < 0) + pr_err("ramster: Error %d while listening on %pI4:%u\n", + ret, &addr, ntohs(port)); + +out: + if (ret) { + r2net_listen_sock = NULL; + if (sock) + sock_release(sock); + } + return ret; +} + +/* + * called from node manager when we should bring up our network listening + * socket. node manager handles all the serialization to only call this + * once and to match it with r2net_stop_listening(). note, + * r2nm_this_node() doesn't work yet as we're being called while it + * is being set up. + */ +int r2net_start_listening(struct r2nm_node *node) +{ + int ret = 0; + + BUG_ON(r2net_wq != NULL); + BUG_ON(r2net_listen_sock != NULL); + + mlog(ML_KTHREAD, "starting r2net thread...\n"); + r2net_wq = create_singlethread_workqueue("r2net"); + if (r2net_wq == NULL) { + mlog(ML_ERROR, "unable to launch r2net thread\n"); + return -ENOMEM; /* ? */ + } + + ret = r2net_open_listening_sock(node->nd_ipv4_address, + node->nd_ipv4_port); + if (ret) { + destroy_workqueue(r2net_wq); + r2net_wq = NULL; + } + + return ret; +} + +/* again, r2nm_this_node() doesn't work here as we're involved in + * tearing it down */ +void r2net_stop_listening(struct r2nm_node *node) +{ + struct socket *sock = r2net_listen_sock; + size_t i; + + BUG_ON(r2net_wq == NULL); + BUG_ON(r2net_listen_sock == NULL); + + /* stop the listening socket from generating work */ + write_lock_bh(&sock->sk->sk_callback_lock); + sock->sk->sk_data_ready = sock->sk->sk_user_data; + sock->sk->sk_user_data = NULL; + write_unlock_bh(&sock->sk->sk_callback_lock); + + for (i = 0; i < ARRAY_SIZE(r2net_nodes); i++) { + struct r2nm_node *node = r2nm_get_node_by_num(i); + if (node) { + r2net_disconnect_node(node); + r2nm_node_put(node); + } + } + + /* finish all work and tear down the work queue */ + mlog(ML_KTHREAD, "waiting for r2net thread to exit....\n"); + destroy_workqueue(r2net_wq); + r2net_wq = NULL; + + sock_release(r2net_listen_sock); + r2net_listen_sock = NULL; +} + +void r2net_hb_node_up_manual(int node_num) +{ + struct r2nm_node dummy; + if (r2nm_single_cluster == NULL) + pr_err("ramster: cluster not alive, node_up_manual ignored\n"); + else { + r2hb_manual_set_node_heartbeating(node_num); + r2net_hb_node_up_cb(&dummy, node_num, NULL); + } +} + +/* ------------------------------------------------------------ */ + +int r2net_init(void) +{ + unsigned long i; + + if (r2net_debugfs_init()) + return -ENOMEM; + + r2net_hand = kzalloc(sizeof(struct r2net_handshake), GFP_KERNEL); + r2net_keep_req = kzalloc(sizeof(struct r2net_msg), GFP_KERNEL); + r2net_keep_resp = kzalloc(sizeof(struct r2net_msg), GFP_KERNEL); + if (!r2net_hand || !r2net_keep_req || !r2net_keep_resp) { + kfree(r2net_hand); + kfree(r2net_keep_req); + kfree(r2net_keep_resp); + return -ENOMEM; + } + + r2net_hand->protocol_version = cpu_to_be64(R2NET_PROTOCOL_VERSION); + r2net_hand->connector_id = cpu_to_be64(1); + + r2net_keep_req->magic = cpu_to_be16(R2NET_MSG_KEEP_REQ_MAGIC); + r2net_keep_resp->magic = cpu_to_be16(R2NET_MSG_KEEP_RESP_MAGIC); + + for (i = 0; i < ARRAY_SIZE(r2net_nodes); i++) { + struct r2net_node *nn = r2net_nn_from_num(i); + + atomic_set(&nn->nn_timeout, 0); + spin_lock_init(&nn->nn_lock); + INIT_DELAYED_WORK(&nn->nn_connect_work, r2net_start_connect); + INIT_DELAYED_WORK(&nn->nn_connect_expired, + r2net_connect_expired); + INIT_DELAYED_WORK(&nn->nn_still_up, r2net_still_up); + /* until we see hb from a node we'll return einval */ + nn->nn_persistent_error = -ENOTCONN; + init_waitqueue_head(&nn->nn_sc_wq); + idr_init(&nn->nn_status_idr); + INIT_LIST_HEAD(&nn->nn_status_list); + } + + return 0; +} + +void r2net_exit(void) +{ + kfree(r2net_hand); + kfree(r2net_keep_req); + kfree(r2net_keep_resp); + r2net_debugfs_exit(); +} diff --git a/drivers/staging/ramster/ramster/tcp.h b/drivers/staging/ramster/ramster/tcp.h new file mode 100644 index 000000000000..9d05833452b5 --- /dev/null +++ b/drivers/staging/ramster/ramster/tcp.h @@ -0,0 +1,159 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * tcp.h + * + * Function prototypes + * + * Copyright (C) 2004 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + * + */ + +#ifndef R2CLUSTER_TCP_H +#define R2CLUSTER_TCP_H + +#include <linux/socket.h> +#ifdef __KERNEL__ +#include <net/sock.h> +#include <linux/tcp.h> +#else +#include <sys/socket.h> +#endif +#include <linux/inet.h> +#include <linux/in.h> + +struct r2net_msg { + __be16 magic; + __be16 data_len; + __be16 msg_type; + __be16 pad1; + __be32 sys_status; + __be32 status; + __be32 key; + __be32 msg_num; + __u8 buf[0]; +}; + +typedef int (r2net_msg_handler_func)(struct r2net_msg *msg, u32 len, void *data, + void **ret_data); +typedef void (r2net_post_msg_handler_func)(int status, void *data, + void *ret_data); + +#define R2NET_MAX_PAYLOAD_BYTES (4096 - sizeof(struct r2net_msg)) + +/* same as hb delay, we're waiting for another node to recognize our hb */ +#define R2NET_RECONNECT_DELAY_MS_DEFAULT 2000 + +#define R2NET_KEEPALIVE_DELAY_MS_DEFAULT 2000 +#define R2NET_IDLE_TIMEOUT_MS_DEFAULT 30000 + + +/* TODO: figure this out.... */ +static inline int r2net_link_down(int err, struct socket *sock) +{ + if (sock) { + if (sock->sk->sk_state != TCP_ESTABLISHED && + sock->sk->sk_state != TCP_CLOSE_WAIT) + return 1; + } + + if (err >= 0) + return 0; + switch (err) { + + /* ????????????????????????? */ + case -ERESTARTSYS: + case -EBADF: + /* When the server has died, an ICMP port unreachable + * message prompts ECONNREFUSED. */ + case -ECONNREFUSED: + case -ENOTCONN: + case -ECONNRESET: + case -EPIPE: + return 1; + + } + return 0; +} + +enum { + R2NET_DRIVER_UNINITED, + R2NET_DRIVER_READY, +}; + +int r2net_send_message(u32 msg_type, u32 key, void *data, u32 len, + u8 target_node, int *status); +int r2net_send_message_vec(u32 msg_type, u32 key, struct kvec *vec, + size_t veclen, u8 target_node, int *status); + +int r2net_register_handler(u32 msg_type, u32 key, u32 max_len, + r2net_msg_handler_func *func, void *data, + r2net_post_msg_handler_func *post_func, + struct list_head *unreg_list); +void r2net_unregister_handler_list(struct list_head *list); + +void r2net_fill_node_map(unsigned long *map, unsigned bytes); + +void r2net_force_data_magic(struct r2net_msg *, u16, u32); +void r2net_hb_node_up_manual(int); +struct r2net_node *r2net_nn_from_num(u8); + +struct r2nm_node; +int r2net_register_hb_callbacks(void); +void r2net_unregister_hb_callbacks(void); +int r2net_start_listening(struct r2nm_node *node); +void r2net_stop_listening(struct r2nm_node *node); +void r2net_disconnect_node(struct r2nm_node *node); +int r2net_num_connected_peers(void); + +int r2net_init(void); +void r2net_exit(void); + +struct r2net_send_tracking; +struct r2net_sock_container; + +#if 0 +int r2net_debugfs_init(void); +void r2net_debugfs_exit(void); +void r2net_debug_add_nst(struct r2net_send_tracking *nst); +void r2net_debug_del_nst(struct r2net_send_tracking *nst); +void r2net_debug_add_sc(struct r2net_sock_container *sc); +void r2net_debug_del_sc(struct r2net_sock_container *sc); +#else +static inline int r2net_debugfs_init(void) +{ + return 0; +} +static inline void r2net_debugfs_exit(void) +{ +} +static inline void r2net_debug_add_nst(struct r2net_send_tracking *nst) +{ +} +static inline void r2net_debug_del_nst(struct r2net_send_tracking *nst) +{ +} +static inline void r2net_debug_add_sc(struct r2net_sock_container *sc) +{ +} +static inline void r2net_debug_del_sc(struct r2net_sock_container *sc) +{ +} +#endif /* CONFIG_DEBUG_FS */ + +#endif /* R2CLUSTER_TCP_H */ diff --git a/drivers/staging/ramster/ramster/tcp_internal.h b/drivers/staging/ramster/ramster/tcp_internal.h new file mode 100644 index 000000000000..4d8cc9f96fd2 --- /dev/null +++ b/drivers/staging/ramster/ramster/tcp_internal.h @@ -0,0 +1,248 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * Copyright (C) 2005 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#ifndef R2CLUSTER_TCP_INTERNAL_H +#define R2CLUSTER_TCP_INTERNAL_H + +#define R2NET_MSG_MAGIC ((u16)0xfa55) +#define R2NET_MSG_STATUS_MAGIC ((u16)0xfa56) +#define R2NET_MSG_KEEP_REQ_MAGIC ((u16)0xfa57) +#define R2NET_MSG_KEEP_RESP_MAGIC ((u16)0xfa58) +/* + * "data magic" is a long version of "status magic" where the message + * payload actually contains data to be passed in reply to certain messages + */ +#define R2NET_MSG_DATA_MAGIC ((u16)0xfa59) + +/* we're delaying our quorum decision so that heartbeat will have timed + * out truly dead nodes by the time we come around to making decisions + * on their number */ +#define R2NET_QUORUM_DELAY_MS \ + ((r2hb_dead_threshold + 2) * R2HB_REGION_TIMEOUT_MS) + +/* + * This version number represents quite a lot, unfortunately. It not + * only represents the raw network message protocol on the wire but also + * locking semantics of the file system using the protocol. It should + * be somewhere else, I'm sure, but right now it isn't. + * + * With version 11, we separate out the filesystem locking portion. The + * filesystem now has a major.minor version it negotiates. Version 11 + * introduces this negotiation to the r2dlm protocol, and as such the + * version here in tcp_internal.h should not need to be bumped for + * filesystem locking changes. + * + * New in version 11 + * - Negotiation of filesystem locking in the dlm join. + * + * New in version 10: + * - Meta/data locks combined + * + * New in version 9: + * - All votes removed + * + * New in version 8: + * - Replace delete inode votes with a cluster lock + * + * New in version 7: + * - DLM join domain includes the live nodemap + * + * New in version 6: + * - DLM lockres remote refcount fixes. + * + * New in version 5: + * - Network timeout checking protocol + * + * New in version 4: + * - Remove i_generation from lock names for better stat performance. + * + * New in version 3: + * - Replace dentry votes with a cluster lock + * + * New in version 2: + * - full 64 bit i_size in the metadata lock lvbs + * - introduction of "rw" lock and pushing meta/data locking down + */ +#define R2NET_PROTOCOL_VERSION 11ULL +struct r2net_handshake { + __be64 protocol_version; + __be64 connector_id; + __be32 r2hb_heartbeat_timeout_ms; + __be32 r2net_idle_timeout_ms; + __be32 r2net_keepalive_delay_ms; + __be32 r2net_reconnect_delay_ms; +}; + +struct r2net_node { + /* this is never called from int/bh */ + spinlock_t nn_lock; + + /* set the moment an sc is allocated and a connect is started */ + struct r2net_sock_container *nn_sc; + /* _valid is only set after the handshake passes and tx can happen */ + unsigned nn_sc_valid:1; + /* if this is set tx just returns it */ + int nn_persistent_error; + /* It is only set to 1 after the idle time out. */ + atomic_t nn_timeout; + + /* threads waiting for an sc to arrive wait on the wq for generation + * to increase. it is increased when a connecting socket succeeds + * or fails or when an accepted socket is attached. */ + wait_queue_head_t nn_sc_wq; + + struct idr nn_status_idr; + struct list_head nn_status_list; + + /* connects are attempted from when heartbeat comes up until either hb + * goes down, the node is unconfigured, no connect attempts succeed + * before R2NET_CONN_IDLE_DELAY, or a connect succeeds. connect_work + * is queued from set_nn_state both from hb up and from itself if a + * connect attempt fails and so can be self-arming. shutdown is + * careful to first mark the nn such that no connects will be attempted + * before canceling delayed connect work and flushing the queue. */ + struct delayed_work nn_connect_work; + unsigned long nn_last_connect_attempt; + + /* this is queued as nodes come up and is canceled when a connection is + * established. this expiring gives up on the node and errors out + * transmits */ + struct delayed_work nn_connect_expired; + + /* after we give up on a socket we wait a while before deciding + * that it is still heartbeating and that we should do some + * quorum work */ + struct delayed_work nn_still_up; +}; + +struct r2net_sock_container { + struct kref sc_kref; + /* the next two are valid for the life time of the sc */ + struct socket *sc_sock; + struct r2nm_node *sc_node; + + /* all of these sc work structs hold refs on the sc while they are + * queued. they should not be able to ref a freed sc. the teardown + * race is with r2net_wq destruction in r2net_stop_listening() */ + + /* rx and connect work are generated from socket callbacks. sc + * shutdown removes the callbacks and then flushes the work queue */ + struct work_struct sc_rx_work; + struct work_struct sc_connect_work; + /* shutdown work is triggered in two ways. the simple way is + * for a code path calls ensure_shutdown which gets a lock, removes + * the sc from the nn, and queues the work. in this case the + * work is single-shot. the work is also queued from a sock + * callback, though, and in this case the work will find the sc + * still on the nn and will call ensure_shutdown itself.. this + * ends up triggering the shutdown work again, though nothing + * will be done in that second iteration. so work queue teardown + * has to be careful to remove the sc from the nn before waiting + * on the work queue so that the shutdown work doesn't remove the + * sc and rearm itself. + */ + struct work_struct sc_shutdown_work; + + struct timer_list sc_idle_timeout; + struct delayed_work sc_keepalive_work; + + unsigned sc_handshake_ok:1; + + struct page *sc_page; + size_t sc_page_off; + + /* original handlers for the sockets */ + void (*sc_state_change)(struct sock *sk); + void (*sc_data_ready)(struct sock *sk, int bytes); + + u32 sc_msg_key; + u16 sc_msg_type; + +#ifdef CONFIG_DEBUG_FS + struct list_head sc_net_debug_item; + ktime_t sc_tv_timer; + ktime_t sc_tv_data_ready; + ktime_t sc_tv_advance_start; + ktime_t sc_tv_advance_stop; + ktime_t sc_tv_func_start; + ktime_t sc_tv_func_stop; +#endif +#ifdef CONFIG_RAMSTER_FS_STATS + ktime_t sc_tv_acquiry_total; + ktime_t sc_tv_send_total; + ktime_t sc_tv_status_total; + u32 sc_send_count; + u32 sc_recv_count; + ktime_t sc_tv_process_total; +#endif + struct mutex sc_send_lock; +}; + +struct r2net_msg_handler { + struct rb_node nh_node; + u32 nh_max_len; + u32 nh_msg_type; + u32 nh_key; + r2net_msg_handler_func *nh_func; + r2net_msg_handler_func *nh_func_data; + r2net_post_msg_handler_func + *nh_post_func; + struct kref nh_kref; + struct list_head nh_unregister_item; +}; + +enum r2net_system_error { + R2NET_ERR_NONE = 0, + R2NET_ERR_NO_HNDLR, + R2NET_ERR_OVERFLOW, + R2NET_ERR_DIED, + R2NET_ERR_MAX +}; + +struct r2net_status_wait { + enum r2net_system_error ns_sys_status; + s32 ns_status; + int ns_id; + wait_queue_head_t ns_wq; + struct list_head ns_node_item; +}; + +#ifdef CONFIG_DEBUG_FS +/* just for state dumps */ +struct r2net_send_tracking { + struct list_head st_net_debug_item; + struct task_struct *st_task; + struct r2net_sock_container *st_sc; + u32 st_id; + u32 st_msg_type; + u32 st_msg_key; + u8 st_node; + ktime_t st_sock_time; + ktime_t st_send_time; + ktime_t st_status_time; +}; +#else +struct r2net_send_tracking { + u32 dummy; +}; +#endif /* CONFIG_DEBUG_FS */ + +#endif /* R2CLUSTER_TCP_INTERNAL_H */ |