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-rw-r--r--src/kernel/xloop_file_fmt_qcow_main.c33
-rw-r--r--src/kernel/xloop_file_fmt_raw.c5
-rw-r--r--src/kernel/xloop_main.c1197
-rw-r--r--src/kernel/xloop_main.h46
4 files changed, 755 insertions, 526 deletions
diff --git a/src/kernel/xloop_file_fmt_qcow_main.c b/src/kernel/xloop_file_fmt_qcow_main.c
index e642160..4fc2fe3 100644
--- a/src/kernel/xloop_file_fmt_qcow_main.c
+++ b/src/kernel/xloop_file_fmt_qcow_main.c
@@ -21,6 +21,7 @@
#include <linux/mutex.h>
#include <linux/uio.h>
#include <linux/string.h>
+#include <linux/version.h>
#include <linux/vmalloc.h>
#include <linux/zlib.h>
#ifdef CONFIG_ZSTD_DECOMPRESS
@@ -941,7 +942,9 @@ static int __qcow_file_fmt_read_compressed(struct xloop_file_fmt *xlo_fmt, struc
u8 *in_buf = NULL;
ssize_t len;
void *data;
+#if LINUX_VERSION_CODE < KERNEL_VERSION(5, 15, 0)
unsigned long irq_flags;
+#endif
int offset_in_cluster = xloop_file_fmt_qcow_offset_into_cluster(qcow_data, offset);
coffset = file_cluster_offset & qcow_data->cluster_offset_mask;
@@ -971,10 +974,18 @@ static int __qcow_file_fmt_read_compressed(struct xloop_file_fmt *xlo_fmt, struc
}
ASSERT(bytes <= bvec->bv_len);
- data = bvec_kmap_irq(bvec, &irq_flags) + bytes_done;
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 15, 0)
+ data = bvec_kmap_local(bvec) + bytes_done;
+#else
+ data = bvec_kmap_irq(bvec, &irq_flags) + bytes_done;
+#endif
memcpy(data, qcow_data->cmp_out_buf + offset_in_cluster, bytes);
flush_dcache_page(bvec->bv_page);
- bvec_kunmap_irq(data, &irq_flags);
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 15, 0)
+ kunmap_local(data);
+#else
+ bvec_kunmap_irq(data, &irq_flags);
+#endif
out_free_in_buf:
vfree(in_buf);
@@ -994,7 +1005,9 @@ static int __qcow_file_fmt_read_bvec(struct xloop_file_fmt *xlo_fmt, struct bio_
u64 bytes_done = 0;
enum xloop_file_fmt_qcow_subcluster_type type;
void *data;
+#if LINUX_VERSION_CODE < KERNEL_VERSION(5, 15, 0)
unsigned long irq_flags;
+#endif
ssize_t len;
loff_t pos_read;
@@ -1015,10 +1028,18 @@ static int __qcow_file_fmt_read_bvec(struct xloop_file_fmt *xlo_fmt, struct bio_
case QCOW_SUBCLUSTER_ZERO_ALLOC:
case QCOW_SUBCLUSTER_UNALLOCATED_PLAIN:
case QCOW_SUBCLUSTER_UNALLOCATED_ALLOC:
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 15, 0)
+ data = bvec_kmap_local(bvec) + bytes_done;
+#else
data = bvec_kmap_irq(bvec, &irq_flags) + bytes_done;
+#endif
memset(data, 0, cur_bytes);
flush_dcache_page(bvec->bv_page);
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 15, 0)
+ kunmap_local(data);
+#else
bvec_kunmap_irq(data, &irq_flags);
+#endif
break;
case QCOW_SUBCLUSTER_COMPRESSED:
@@ -1031,10 +1052,18 @@ static int __qcow_file_fmt_read_bvec(struct xloop_file_fmt *xlo_fmt, struct bio_
case QCOW_SUBCLUSTER_NORMAL:
pos_read = host_offset;
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 15, 0)
+ data = bvec_kmap_local(bvec) + bytes_done;
+#else
data = bvec_kmap_irq(bvec, &irq_flags) + bytes_done;
+#endif
len = kernel_read(xlo->xlo_backing_file, data, cur_bytes, &pos_read);
flush_dcache_page(bvec->bv_page);
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 15, 0)
+ kunmap_local(data);
+#else
bvec_kunmap_irq(data, &irq_flags);
+#endif
if (len < 0)
return len;
diff --git a/src/kernel/xloop_file_fmt_raw.c b/src/kernel/xloop_file_fmt_raw.c
index 1c2c42b..2fc8ace 100644
--- a/src/kernel/xloop_file_fmt_raw.c
+++ b/src/kernel/xloop_file_fmt_raw.c
@@ -152,8 +152,6 @@ static void __raw_file_fmt_rw_aio_complete(struct kiocb *iocb, long ret, long re
{
struct xloop_cmd *cmd = container_of(iocb, struct xloop_cmd, iocb);
- if (cmd->css)
- css_put(cmd->css);
cmd->ret = ret;
__raw_file_fmt_rw_aio_do_completion(cmd);
}
@@ -224,8 +222,6 @@ static int __raw_file_fmt_rw_aio(struct xloop_device *xlo, struct xloop_cmd *cmd
cmd->iocb.ki_complete = __raw_file_fmt_rw_aio_complete;
cmd->iocb.ki_flags = IOCB_DIRECT;
cmd->iocb.ki_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_NONE, 0);
- if (cmd->css)
- kthread_associate_blkcg(cmd->css);
if (rw == WRITE)
ret = call_write_iter(file, &cmd->iocb, &iter);
@@ -233,7 +229,6 @@ static int __raw_file_fmt_rw_aio(struct xloop_device *xlo, struct xloop_cmd *cmd
ret = call_read_iter(file, &cmd->iocb, &iter);
__raw_file_fmt_rw_aio_do_completion(cmd);
- kthread_associate_blkcg(NULL);
if (ret != -EIOCBQUEUED)
cmd->iocb.ki_complete(&cmd->iocb, ret, 0);
diff --git a/src/kernel/xloop_main.c b/src/kernel/xloop_main.c
index 9fe0c70..9585e24 100644
--- a/src/kernel/xloop_main.c
+++ b/src/kernel/xloop_main.c
@@ -59,6 +59,7 @@
#include <linux/moduleparam.h>
#include <linux/sched.h>
#include <linux/fs.h>
+#include <linux/pagemap.h>
#include <linux/file.h>
#include <linux/stat.h>
#include <linux/errno.h>
@@ -76,7 +77,6 @@
#include <linux/writeback.h>
#include <linux/completion.h>
#include <linux/highmem.h>
-#include <linux/kthread.h>
#include <linux/splice.h>
#include <linux/sysfs.h>
#include <linux/miscdevice.h>
@@ -84,6 +84,7 @@
#include <linux/uio.h>
#include <linux/ioprio.h>
#include <linux/blk-cgroup.h>
+#include <linux/sched/mm.h>
#include <linux/version.h>
#ifdef CONFIG_DEBUG_FS
#include <linux/debugfs.h>
@@ -96,15 +97,51 @@
#include <linux/uaccess.h>
-/* define RHEL_CHECK_VERSION macro to check CentOS version */
-#if defined(RHEL_RELEASE_CODE) && defined(RHEL_RELEASE_VERSION)
-#define RHEL_CHECK_VERSION(CONDITION) (CONDITION)
-#else
-#define RHEL_CHECK_VERSION(CONDITION) (0)
-#endif
+#define XLOOP_IDLE_WORKER_TIMEOUT (60 * HZ)
static DEFINE_IDR(xloop_index_idr);
static DEFINE_MUTEX(xloop_ctl_mutex);
+static DEFINE_MUTEX(xloop_validate_mutex);
+
+/**
+ * xloop_global_lock_killable() - take locks for safe xloop_validate_file() test
+ *
+ * @xlo: struct xloop_device
+ * @global: true if @xlo is about to bind another "struct xloop_device", false otherwise
+ *
+ * Returns 0 on success, -EINTR otherwise.
+ *
+ * Since xloop_validate_file() traverses on other "struct xloop_device" if
+ * is_xloop_device() is true, we need a global lock for serializing concurrent
+ * xloop_configure()/xloop_change_fd()/__xloop_clr_fd() calls.
+ */
+static int xloop_global_lock_killable(struct xloop_device *xlo, bool global)
+{
+ int err;
+
+ if (global) {
+ err = mutex_lock_killable(&xloop_validate_mutex);
+ if (err)
+ return err;
+ }
+ err = mutex_lock_killable(&xlo->xlo_mutex);
+ if (err && global)
+ mutex_unlock(&xloop_validate_mutex);
+ return err;
+}
+
+/**
+ * xloop_global_unlock() - release locks taken by xloop_global_lock_killable()
+ *
+ * @xlo: struct xloop_device
+ * @global: true if @xlo was about to bind another "struct xloop_device", false otherwise
+ */
+static void xloop_global_unlock(struct xloop_device *xlo, bool global)
+{
+ mutex_unlock(&xlo->xlo_mutex);
+ if (global)
+ mutex_unlock(&xloop_validate_mutex);
+}
static int max_part;
static int part_shift;
@@ -115,8 +152,10 @@ struct device *xloop_device_to_dev(struct xloop_device *xlo)
}
EXPORT_SYMBOL(xloop_device_to_dev);
-static int transfer_xor(struct xloop_device *xlo, int cmd, struct page *raw_page, unsigned int raw_off,
- struct page *xloop_page, unsigned int xloop_off, int size, sector_t real_block)
+static int transfer_xor(struct xloop_device *xlo, int cmd,
+ struct page *raw_page, unsigned raw_off,
+ struct page *xloop_page, unsigned xloop_off,
+ int size, sector_t real_block)
{
char *raw_buf = kmap_atomic(raw_page) + raw_off;
char *xloop_buf = kmap_atomic(xloop_page) + xloop_off;
@@ -151,12 +190,19 @@ static int xor_init(struct xloop_device *xlo, const struct xloop_info64 *info)
static struct xloop_func_table none_funcs = {
.number = XLO_CRYPT_NONE,
-};
+};
-static struct xloop_func_table xor_funcs = { .number = XLO_CRYPT_XOR, .transfer = transfer_xor, .init = xor_init };
+static struct xloop_func_table xor_funcs = {
+ .number = XLO_CRYPT_XOR,
+ .transfer = transfer_xor,
+ .init = xor_init
+};
/* xfer_funcs[0] is special - its release function is never called */
-static struct xloop_func_table *xfer_funcs[MAX_XLO_CRYPT] = { &none_funcs, &xor_funcs };
+static struct xloop_func_table *xfer_funcs[MAX_XLO_CRYPT] = {
+ &none_funcs,
+ &xor_funcs
+};
static loff_t get_xloop_size(struct xloop_device *xlo, struct file *file)
{
@@ -169,7 +215,7 @@ static void __xloop_update_dio(struct xloop_device *xlo, bool dio)
struct address_space *mapping = file->f_mapping;
struct inode *inode = mapping->host;
unsigned short sb_bsize = 0;
- unsigned int dio_align = 0;
+ unsigned dio_align = 0;
bool use_dio;
if (inode->i_sb->s_bdev) {
@@ -188,8 +234,10 @@ static void __xloop_update_dio(struct xloop_device *xlo, bool dio)
* of requests in sane applications should be PAGE_SIZE aligned
*/
if (dio) {
- if (queue_logical_block_size(xlo->xlo_queue) >= sb_bsize && !(xlo->xlo_offset & dio_align) &&
- mapping->a_ops->direct_IO && !xlo->transfer)
+ if (queue_logical_block_size(xlo->xlo_queue) >= sb_bsize &&
+ !(xlo->xlo_offset & dio_align) &&
+ mapping->a_ops->direct_IO &&
+ !xlo->transfer)
use_dio = true;
else
use_dio = false;
@@ -205,7 +253,7 @@ static void __xloop_update_dio(struct xloop_device *xlo, bool dio)
/*
* The flag of XLO_FLAGS_DIRECT_IO is handled similarly with
- * XLO_FLAGS_READ_ONLY, both are set from kernel, and losetup
+ * XLO_FLAGS_READ_ONLY, both are set from kernel, and xlosetup
* will get updated by ioctl(XLOOP_GET_STATUS)
*/
if (xlo->xlo_state == Xlo_bound)
@@ -223,18 +271,6 @@ static void __xloop_update_dio(struct xloop_device *xlo, bool dio)
}
/**
- * xloop_validate_block_size() - validates the passed in block size
- * @bsize: size to validate
- */
-static int xloop_validate_block_size(unsigned short bsize)
-{
- if (bsize < 512 || bsize > PAGE_SIZE || !is_power_of_2(bsize))
- return -EINVAL;
-
- return 0;
-}
-
-/**
* xloop_set_size() - sets device size and notifies userspace
* @xlo: struct xloop_device to set the size for
* @size: new size of the xloop device
@@ -244,31 +280,25 @@ static int xloop_validate_block_size(unsigned short bsize)
*/
static void xloop_set_size(struct xloop_device *xlo, loff_t size)
{
- struct block_device *bdev = xlo->xlo_device;
-#if LINUX_VERSION_CODE < KERNEL_VERSION(5, 7, 0)
- sector_t capacity;
-#endif
+ if (!set_capacity_and_notify(xlo->xlo_disk, size))
+ kobject_uevent(&disk_to_dev(xlo->xlo_disk)->kobj, KOBJ_CHANGE);
+}
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 10, 0)
- bd_set_nr_sectors(bdev, size);
-#else
- bd_set_size(bdev, size << SECTOR_SHIFT);
-#endif
+static inline int
+xlo_do_transfer(struct xloop_device *xlo, int cmd,
+ struct page *rpage, unsigned roffs,
+ struct page *lpage, unsigned loffs,
+ int size, sector_t rblock)
+{
+ int ret;
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 10, 0)
- if (!set_capacity_revalidate_and_notify(xlo->xlo_disk, size, false))
- kobject_uevent(&disk_to_dev(bdev->bd_disk)->kobj, KOBJ_CHANGE);
-#elif LINUX_VERSION_CODE >= KERNEL_VERSION(5, 7, 0)
- set_capacity_revalidate_and_notify(xlo->xlo_disk, size, false);
-#else
- capacity = get_capacity(xlo->xlo_disk);
- set_capacity(xlo->xlo_disk, size);
- if (capacity != size && capacity != 0 && size != 0) {
- char *envp[] = { "RESIZE=1", NULL };
+ ret = xlo->transfer(xlo, cmd, rpage, roffs, lpage, loffs, size, rblock);
+ if (likely(!ret))
+ return 0;
- kobject_uevent_env(&disk_to_dev(xlo->xlo_disk)->kobj, KOBJ_CHANGE, envp);
- }
-#endif
+ pr_err_ratelimited("Transfer error at byte offset %llu, length %i.\n",
+ (unsigned long long)rblock << 9, size);
+ return ret;
}
static void xlo_complete_rq(struct request *rq)
@@ -311,9 +341,9 @@ static int do_req_filebacked(struct xloop_device *xlo, struct request *rq)
/*
* xlo_write_simple and xlo_read_simple should have been covered
- * by io submit style function like xlo_rw_aio(), one blocker
- * is that xlo_read_simple() need to call flush_dcache_page after
- * the page is written from kernel, and it isn't easy to handle
+ * by io submit style function like xloop_file_fmt_read_aio(), one
+ * blocker is that xloop_file_fmt_read() need to call flush_dcache_page
+ * after the page is written from kernel, and it isn't easy to handle
* this in io submit style function which submits all segments
* of the req at one time. And direct read IO doesn't need to
* run flush_dcache_page().
@@ -343,48 +373,48 @@ static int do_req_filebacked(struct xloop_device *xlo, struct request *rq)
static inline void xloop_update_dio(struct xloop_device *xlo)
{
- __xloop_update_dio(xlo, (xlo->xlo_backing_file->f_flags & O_DIRECT) | xlo->use_dio);
+ __xloop_update_dio(xlo, (xlo->xlo_backing_file->f_flags & O_DIRECT) |
+ xlo->use_dio);
}
-static void xloop_reread_partitions(struct xloop_device *xlo, struct block_device *bdev)
+static void xloop_reread_partitions(struct xloop_device *xlo)
{
int rc;
-#if (KERNEL_VERSION(5, 5, 0) <= LINUX_VERSION_CODE) || \
- RHEL_CHECK_VERSION(RHEL_RELEASE_VERSION(8, 3) <= RHEL_RELEASE_CODE)
- mutex_lock(&bdev->bd_mutex);
- rc = bdev_disk_changed(bdev, false);
- mutex_unlock(&bdev->bd_mutex);
-#else
- rc = blkdev_reread_part(bdev);
-#endif
+ mutex_lock(&xlo->xlo_disk->open_mutex);
+ rc = bdev_disk_changed(xlo->xlo_disk, false);
+ mutex_unlock(&xlo->xlo_disk->open_mutex);
if (rc)
- dev_warn(xloop_device_to_dev(xlo), "partition scan failed (rc=%d)\n", rc);
+ dev_warn(xloop_device_to_dev(xlo),
+ "partition scan of xloop%d (%s) failed (rc=%d)\n",
+ xlo->xlo_number, xlo->xlo_file_name, rc);
}
static inline int is_xloop_device(struct file *file)
{
struct inode *i = file->f_mapping->host;
- return i && S_ISBLK(i->i_mode) && MAJOR(i->i_rdev) == XLOOP_MAJOR;
+ return i && S_ISBLK(i->i_mode) && imajor(i) == XLOOP_MAJOR;
}
static int xloop_validate_file(struct file *file, struct block_device *bdev)
{
- struct inode *inode = file->f_mapping->host;
- struct file *f = file;
+ struct inode *inode = file->f_mapping->host;
+ struct file *f = file;
/* Avoid recursion */
while (is_xloop_device(f)) {
struct xloop_device *l;
- if (f->f_mapping->host->i_bdev == bdev)
+ lockdep_assert_held(&xloop_validate_mutex);
+ if (f->f_mapping->host->i_rdev == bdev->bd_dev)
return -EBADF;
- l = f->f_mapping->host->i_bdev->bd_disk->private_data;
+ l = I_BDEV(f->f_mapping->host)->bd_disk->private_data;
if (l->xlo_state != Xlo_bound)
return -EINVAL;
-
+ /* Order wrt setting xlo->xlo_backing_file in xloop_configure(). */
+ rmb();
f = l->xlo_backing_file;
}
if (!S_ISREG(inode->i_mode) && !S_ISBLK(inode->i_mode))
@@ -400,15 +430,21 @@ static int xloop_validate_file(struct file *file, struct block_device *bdev)
* This can only work if the xloop device is used read-only, and if the
* new backing store is the same size and type as the old backing store.
*/
-static int xloop_change_fd(struct xloop_device *xlo, struct block_device *bdev, unsigned int arg)
+static int xloop_change_fd(struct xloop_device *xlo, struct block_device *bdev,
+ unsigned int arg)
{
- struct file *file = NULL, *old_file;
+ struct file *file = fget(arg);
+ struct file *old_file;
int error;
bool partscan;
+ bool is_xloop;
- error = mutex_lock_killable(&xloop_ctl_mutex);
+ if (!file)
+ return -EBADF;
+ is_xloop = is_xloop_device(file);
+ error = xloop_global_lock_killable(xlo, is_xloop);
if (error)
- return error;
+ goto out_putf;
error = -ENXIO;
if (xlo->xlo_state != Xlo_bound)
goto out_err;
@@ -418,11 +454,6 @@ static int xloop_change_fd(struct xloop_device *xlo, struct block_device *bdev,
if (!(xlo->xlo_flags & XLO_FLAGS_READ_ONLY))
goto out_err;
- error = -EBADF;
- file = fget(arg);
- if (!file)
- goto out_err;
-
error = xloop_validate_file(file, bdev);
if (error)
goto out_err;
@@ -436,35 +467,47 @@ static int xloop_change_fd(struct xloop_device *xlo, struct block_device *bdev,
goto out_err;
/* and ... switch */
+ disk_force_media_change(xlo->xlo_disk, DISK_EVENT_MEDIA_CHANGE);
blk_mq_freeze_queue(xlo->xlo_queue);
mapping_set_gfp_mask(old_file->f_mapping, xlo->old_gfp_mask);
xlo->xlo_backing_file = file;
xlo->old_gfp_mask = mapping_gfp_mask(file->f_mapping);
- mapping_set_gfp_mask(file->f_mapping, xlo->old_gfp_mask & ~(__GFP_IO | __GFP_FS));
+ mapping_set_gfp_mask(file->f_mapping,
+ xlo->old_gfp_mask & ~(__GFP_IO|__GFP_FS));
xloop_update_dio(xlo);
blk_mq_unfreeze_queue(xlo->xlo_queue);
partscan = xlo->xlo_flags & XLO_FLAGS_PARTSCAN;
- mutex_unlock(&xloop_ctl_mutex);
+ xloop_global_unlock(xlo, is_xloop);
+
+ /*
+ * Flush xloop_validate_file() before fput(), for l->xlo_backing_file
+ * might be pointing at old_file which might be the last reference.
+ */
+ if (!is_xloop) {
+ mutex_lock(&xloop_validate_mutex);
+ mutex_unlock(&xloop_validate_mutex);
+ }
/*
- * We must drop file reference outside of xloop_ctl_mutex as dropping
- * the file ref can take bd_mutex which creates circular locking
+ * We must drop file reference outside of xlo_mutex as dropping
+ * the file ref can take open_mutex which creates circular locking
* dependency.
*/
fput(old_file);
if (partscan)
- xloop_reread_partitions(xlo, bdev);
+ xloop_reread_partitions(xlo);
return 0;
out_err:
- mutex_unlock(&xloop_ctl_mutex);
- if (file)
- fput(file);
+ xloop_global_unlock(xlo, is_xloop);
+out_putf:
+ fput(file);
return error;
}
/* xloop sysfs attributes */
-static ssize_t xloop_attr_show(struct device *dev, char *page, ssize_t (*callback)(struct xloop_device *, char *))
+static ssize_t xloop_attr_show(struct device *dev, char *page,
+ ssize_t (*callback)(struct xloop_device *, char *))
{
struct gendisk *disk = dev_to_disk(dev);
struct xloop_device *xlo = disk->private_data;
@@ -472,13 +515,15 @@ static ssize_t xloop_attr_show(struct device *dev, char *page, ssize_t (*callbac
return callback(xlo, page);
}
-#define XLOOP_ATTR_RO(_name) \
- static ssize_t xloop_attr_##_name##_show(struct xloop_device *, char *); \
- static ssize_t xloop_attr_do_show_##_name(struct device *d, struct device_attribute *attr, char *b) \
- { \
- return xloop_attr_show(d, b, xloop_attr_##_name##_show); \
- } \
- static struct device_attribute xloop_attr_##_name = __ATTR(_name, 0444, xloop_attr_do_show_##_name, NULL);
+#define XLOOP_ATTR_RO(_name) \
+static ssize_t xloop_attr_##_name##_show(struct xloop_device *, char *); \
+static ssize_t xloop_attr_do_show_##_name(struct device *d, \
+ struct device_attribute *attr, char *b) \
+{ \
+ return xloop_attr_show(d, b, xloop_attr_##_name##_show); \
+} \
+static struct device_attribute xloop_attr_##_name = \
+ __ATTR(_name, 0444, xloop_attr_do_show_##_name, NULL);
static ssize_t xloop_attr_backing_file_show(struct xloop_device *xlo, char *buf)
{
@@ -552,26 +597,32 @@ XLOOP_ATTR_RO(partscan);
XLOOP_ATTR_RO(dio);
static struct attribute *xloop_attrs[] = {
- &xloop_attr_backing_file.attr, &xloop_attr_file_fmt_type.attr,
- &xloop_attr_offset.attr, &xloop_attr_sizelimit.attr,
- &xloop_attr_autoclear.attr, &xloop_attr_partscan.attr,
- &xloop_attr_dio.attr, NULL,
+ &xloop_attr_backing_file.attr,
+ &xloop_attr_file_fmt_type.attr,
+ &xloop_attr_offset.attr,
+ &xloop_attr_sizelimit.attr,
+ &xloop_attr_autoclear.attr,
+ &xloop_attr_partscan.attr,
+ &xloop_attr_dio.attr,
+ NULL,
};
static struct attribute_group xloop_attribute_group = {
- .name = "xloop",
- .attrs = xloop_attrs,
+ .name = "xloop",
+ .attrs= xloop_attrs,
};
static void xloop_sysfs_init(struct xloop_device *xlo)
{
- xlo->sysfs_inited = !sysfs_create_group(&disk_to_dev(xlo->xlo_disk)->kobj, &xloop_attribute_group);
+ xlo->sysfs_inited = !sysfs_create_group(&disk_to_dev(xlo->xlo_disk)->kobj,
+ &xloop_attribute_group);
}
static void xloop_sysfs_exit(struct xloop_device *xlo)
{
if (xlo->sysfs_inited)
- sysfs_remove_group(&disk_to_dev(xlo->xlo_disk)->kobj, &xloop_attribute_group);
+ sysfs_remove_group(&disk_to_dev(xlo->xlo_disk)->kobj,
+ &xloop_attribute_group);
}
static void xloop_config_discard(struct xloop_device *xlo)
@@ -589,12 +640,11 @@ static void xloop_config_discard(struct xloop_device *xlo)
* file-backed xloop devices: discarded regions read back as zero.
*/
if (S_ISBLK(inode->i_mode) && !xlo->xlo_encrypt_key_size) {
- struct request_queue *backingq;
-
- backingq = bdev_get_queue(inode->i_bdev);
+ struct request_queue *backingq = bdev_get_queue(I_BDEV(inode));
max_discard_sectors = backingq->limits.max_write_zeroes_sectors;
- granularity = backingq->limits.discard_granularity ?: queue_physical_block_size(backingq);
+ granularity = backingq->limits.discard_granularity ?:
+ queue_physical_block_size(backingq);
/*
* We use punch hole to reclaim the free space used by the
@@ -625,31 +675,100 @@ static void xloop_config_discard(struct xloop_device *xlo)
q->limits.discard_alignment = 0;
}
-static void xloop_unprepare_queue(struct xloop_device *xlo)
-{
- kthread_flush_worker(&xlo->worker);
- kthread_stop(xlo->worker_task);
-}
+struct xloop_worker {
+ struct rb_node rb_node;
+ struct work_struct work;
+ struct list_head cmd_list;
+ struct list_head idle_list;
+ struct xloop_device *xlo;
+ struct cgroup_subsys_state *blkcg_css;
+ unsigned long last_ran_at;
+};
+
+static void xloop_workfn(struct work_struct *work);
+static void xloop_rootcg_workfn(struct work_struct *work);
+static void xloop_free_idle_workers(struct timer_list *timer);
-static int xloop_kthread_worker_fn(void *worker_ptr)
+#ifdef CONFIG_BLK_CGROUP
+static inline int queue_on_root_worker(struct cgroup_subsys_state *css)
{
-#if (KERNEL_VERSION(5, 8, 0) <= LINUX_VERSION_CODE) || \
- RHEL_CHECK_VERSION(RHEL_RELEASE_VERSION(8, 4) <= RHEL_RELEASE_CODE)
- current->flags |= PF_LOCAL_THROTTLE | PF_MEMALLOC_NOIO;
+ return !css || css == blkcg_root_css;
+}
#else
- current->flags |= PF_LESS_THROTTLE | PF_MEMALLOC_NOIO;
-#endif
- return kthread_worker_fn(worker_ptr);
+static inline int queue_on_root_worker(struct cgroup_subsys_state *css)
+{
+ return !css;
}
+#endif
-static int xloop_prepare_queue(struct xloop_device *xlo)
+static void xloop_queue_work(struct xloop_device *xlo, struct xloop_cmd *cmd)
{
- kthread_init_worker(&xlo->worker);
- xlo->worker_task = kthread_run(xloop_kthread_worker_fn, &xlo->worker, "xloop%d", xlo->xlo_number);
- if (IS_ERR(xlo->worker_task))
- return -ENOMEM;
- set_user_nice(xlo->worker_task, MIN_NICE);
- return 0;
+ struct rb_node **node = &(xlo->worker_tree.rb_node), *parent = NULL;
+ struct xloop_worker *cur_worker, *worker = NULL;
+ struct work_struct *work;
+ struct list_head *cmd_list;
+
+ spin_lock_irq(&xlo->xlo_work_lock);
+
+ if (queue_on_root_worker(cmd->blkcg_css))
+ goto queue_work;
+
+ node = &xlo->worker_tree.rb_node;
+
+ while (*node) {
+ parent = *node;
+ cur_worker = container_of(*node, struct xloop_worker, rb_node);
+ if (cur_worker->blkcg_css == cmd->blkcg_css) {
+ worker = cur_worker;
+ break;
+ } else if ((long)cur_worker->blkcg_css < (long)cmd->blkcg_css) {
+ node = &(*node)->rb_left;
+ } else {
+ node = &(*node)->rb_right;
+ }
+ }
+ if (worker)
+ goto queue_work;
+
+ worker = kzalloc(sizeof(struct xloop_worker), GFP_NOWAIT | __GFP_NOWARN);
+ /*
+ * In the event we cannot allocate a worker, just queue on the
+ * rootcg worker and issue the I/O as the rootcg
+ */
+ if (!worker) {
+ cmd->blkcg_css = NULL;
+ if (cmd->memcg_css)
+ css_put(cmd->memcg_css);
+ cmd->memcg_css = NULL;
+ goto queue_work;
+ }
+
+ worker->blkcg_css = cmd->blkcg_css;
+ css_get(worker->blkcg_css);
+ INIT_WORK(&worker->work, xloop_workfn);
+ INIT_LIST_HEAD(&worker->cmd_list);
+ INIT_LIST_HEAD(&worker->idle_list);
+ worker->xlo = xlo;
+ rb_link_node(&worker->rb_node, parent, node);
+ rb_insert_color(&worker->rb_node, &xlo->worker_tree);
+queue_work:
+ if (worker) {
+ /*
+ * We need to remove from the idle list here while
+ * holding the lock so that the idle timer doesn't
+ * free the worker
+ */
+ if (!list_empty(&worker->idle_list))
+ list_del_init(&worker->idle_list);
+ work = &worker->work;
+ cmd_list = &worker->cmd_list;
+ } else {
+ work = &xlo->rootcg_work;
+ cmd_list = &xlo->rootcg_cmd_list;
+ }
+ list_add_tail(&cmd->list_entry, cmd_list);
+ queue_work(xlo->workqueue, work);
+ spin_unlock_irq(&xlo->xlo_work_lock);
}
static void xloop_update_rotational(struct xloop_device *xlo)
@@ -670,7 +789,8 @@ static void xloop_update_rotational(struct xloop_device *xlo)
blk_queue_flag_clear(QUEUE_FLAG_NONROT, q);
}
-static int xloop_release_xfer(struct xloop_device *xlo)
+static int
+xloop_release_xfer(struct xloop_device *xlo)
{
int err = 0;
struct xloop_func_table *xfer = xlo->xlo_encryption;
@@ -685,7 +805,9 @@ static int xloop_release_xfer(struct xloop_device *xlo)
return err;
}
-static int xloop_init_xfer(struct xloop_device *xlo, struct xloop_func_table *xfer, const struct xloop_info64 *i)
+static int
+xloop_init_xfer(struct xloop_device *xlo, struct xloop_func_table *xfer,
+ const struct xloop_info64 *i)
{
int err = 0;
@@ -712,13 +834,15 @@ static int xloop_init_xfer(struct xloop_device *xlo, struct xloop_func_table *xf
* Configures the xloop device parameters according to the passed
* in xloop_info64 configuration.
*/
-static int xloop_set_status_from_info(struct xloop_device *xlo, const struct xloop_info64 *info)
+static int
+xloop_set_status_from_info(struct xloop_device *xlo,
+ const struct xloop_info64 *info)
{
int err;
struct xloop_func_table *xfer;
kuid_t uid = current_uid();
- if ((unsigned int)info->xlo_encrypt_key_size > XLO_KEY_SIZE)
+ if ((unsigned int) info->xlo_encrypt_key_size > XLO_KEY_SIZE)
return -EINVAL;
err = xloop_release_xfer(xlo);
@@ -744,8 +868,8 @@ static int xloop_set_status_from_info(struct xloop_device *xlo, const struct xlo
xlo->xlo_sizelimit = info->xlo_sizelimit;
memcpy(xlo->xlo_file_name, info->xlo_file_name, XLO_NAME_SIZE);
memcpy(xlo->xlo_crypt_name, info->xlo_crypt_name, XLO_NAME_SIZE);
- xlo->xlo_file_name[XLO_NAME_SIZE - 1] = 0;
- xlo->xlo_crypt_name[XLO_NAME_SIZE - 1] = 0;
+ xlo->xlo_file_name[XLO_NAME_SIZE-1] = 0;
+ xlo->xlo_crypt_name[XLO_NAME_SIZE-1] = 0;
if (!xfer)
xfer = &none_funcs;
@@ -758,60 +882,45 @@ static int xloop_set_status_from_info(struct xloop_device *xlo, const struct xlo
xlo->xlo_init[0] = info->xlo_init[0];
xlo->xlo_init[1] = info->xlo_init[1];
if (info->xlo_encrypt_key_size) {
- memcpy(xlo->xlo_encrypt_key, info->xlo_encrypt_key, info->xlo_encrypt_key_size);
+ memcpy(xlo->xlo_encrypt_key, info->xlo_encrypt_key,
+ info->xlo_encrypt_key_size);
xlo->xlo_key_owner = uid;
}
return 0;
}
-static int xloop_configure(struct xloop_device *xlo, fmode_t mode, struct block_device *bdev,
- const struct xloop_config *config)
+static int xloop_configure(struct xloop_device *xlo, fmode_t mode,
+ struct block_device *bdev,
+ const struct xloop_config *config)
{
- struct file *file;
+ struct file *file = fget(config->fd);
struct inode *inode;
struct address_space *mapping;
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 2, 0)
- struct block_device *claimed_bdev = NULL;
-#endif
int error;
loff_t size;
bool partscan;
unsigned short bsize;
+ bool is_xloop;
+
+ if (!file)
+ return -EBADF;
+ is_xloop = is_xloop_device(file);
/* This is safe, since we have a reference from open(). */
__module_get(THIS_MODULE);
- error = -EBADF;
- file = fget(config->fd);
- if (!file)
- goto out;
-
/*
* If we don't hold exclusive handle for the device, upgrade to it
* here to avoid changing device under exclusive owner.
*/
if (!(mode & FMODE_EXCL)) {
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 9, 0)
- claimed_bdev = bdev->bd_contains;
- error = bd_prepare_to_claim(bdev, claimed_bdev, xloop_configure);
- if (error)
- goto out_putf;
-#elif LINUX_VERSION_CODE >= KERNEL_VERSION(5, 2, 0)
- claimed_bdev = bd_start_claiming(bdev, xloop_configure);
- if (IS_ERR(claimed_bdev)) {
- error = PTR_ERR(claimed_bdev);
- goto out_putf;
- }
-#else
- bdgrab(bdev);
- error = blkdev_get(bdev, mode | FMODE_EXCL, xloop_configure);
+ error = bd_prepare_to_claim(bdev, xloop_configure);
if (error)
goto out_putf;
-#endif
}
- error = mutex_lock_killable(&xloop_ctl_mutex);
+ error = xloop_global_lock_killable(xlo, is_xloop);
if (error)
goto out_bdev;
@@ -832,7 +941,7 @@ static int xloop_configure(struct xloop_device *xlo, fmode_t mode, struct block_
}
if (config->block_size) {
- error = xloop_validate_block_size(config->block_size);
+ error = blk_validate_block_size(config->block_size);
if (error)
goto out_unlock;
}
@@ -841,20 +950,33 @@ static int xloop_configure(struct xloop_device *xlo, fmode_t mode, struct block_
if (error)
goto out_unlock;
- if (!(file->f_mode & FMODE_WRITE) || !(mode & FMODE_WRITE) || !file->f_op->write_iter)
+ if (!(file->f_mode & FMODE_WRITE) || !(mode & FMODE_WRITE) ||
+ !file->f_op->write_iter)
xlo->xlo_flags |= XLO_FLAGS_READ_ONLY;
- error = xloop_prepare_queue(xlo);
- if (error)
+ xlo->workqueue = alloc_workqueue("xloop%d",
+ WQ_UNBOUND | WQ_FREEZABLE,
+ 0,
+ xlo->xlo_number);
+ if (!xlo->workqueue) {
+ error = -ENOMEM;
goto out_unlock;
+ }
- set_device_ro(bdev, (xlo->xlo_flags & XLO_FLAGS_READ_ONLY) != 0);
+ disk_force_media_change(xlo->xlo_disk, DISK_EVENT_MEDIA_CHANGE);
+ set_disk_ro(xlo->xlo_disk, (xlo->xlo_flags & XLO_FLAGS_READ_ONLY) != 0);
+ INIT_WORK(&xlo->rootcg_work, xloop_rootcg_workfn);
+ INIT_LIST_HEAD(&xlo->rootcg_cmd_list);
+ INIT_LIST_HEAD(&xlo->idle_worker_list);
+ xlo->worker_tree = RB_ROOT;
+ timer_setup(&xlo->timer, xloop_free_idle_workers,
+ TIMER_DEFERRABLE);
xlo->use_dio = xlo->xlo_flags & XLO_FLAGS_DIRECT_IO;
xlo->xlo_device = bdev;
xlo->xlo_backing_file = file;
xlo->old_gfp_mask = mapping_gfp_mask(mapping);
- mapping_set_gfp_mask(mapping, xlo->old_gfp_mask & ~(__GFP_IO | __GFP_FS));
+ mapping_set_gfp_mask(mapping, xlo->old_gfp_mask & ~(__GFP_IO|__GFP_FS));
error = xloop_file_fmt_init(xlo->xlo_fmt, config->info.xlo_file_fmt_type);
if (error)
@@ -875,6 +997,7 @@ static int xloop_configure(struct xloop_device *xlo, fmode_t mode, struct block_
blk_queue_physical_block_size(xlo->xlo_queue, bsize);
blk_queue_io_min(xlo->xlo_queue, bsize);
+ xloop_config_discard(xlo);
xloop_update_rotational(xlo);
xloop_update_dio(xlo);
xloop_sysfs_init(xlo);
@@ -882,7 +1005,8 @@ static int xloop_configure(struct xloop_device *xlo, fmode_t mode, struct block_
size = get_xloop_size(xlo, file);
xloop_set_size(xlo, size);
- set_blocksize(bdev, S_ISBLK(inode->i_mode) ? block_size(inode->i_bdev) : PAGE_SIZE);
+ /* Order wrt reading xlo_state in xloop_validate_file(). */
+ wmb();
xlo->xlo_state = Xlo_bound;
if (part_shift)
@@ -891,35 +1015,20 @@ static int xloop_configure(struct xloop_device *xlo, fmode_t mode, struct block_
if (partscan)
xlo->xlo_disk->flags &= ~GENHD_FL_NO_PART_SCAN;
- /* Grab the block_device to prevent its destruction after we
- * put /dev/xloopXX inode. Later in __xloop_clr_fd() we bdput(bdev).
- */
- bdgrab(bdev);
- mutex_unlock(&xloop_ctl_mutex);
+ xloop_global_unlock(xlo, is_xloop);
if (partscan)
- xloop_reread_partitions(xlo, bdev);
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 2, 0)
- if (claimed_bdev)
- bd_abort_claiming(bdev, claimed_bdev, xloop_configure);
-#else
+ xloop_reread_partitions(xlo);
if (!(mode & FMODE_EXCL))
- blkdev_put(bdev, mode | FMODE_EXCL);
-#endif
+ bd_abort_claiming(bdev, xloop_configure);
return 0;
out_unlock:
- mutex_unlock(&xloop_ctl_mutex);
+ xloop_global_unlock(xlo, is_xloop);
out_bdev:
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 2, 0)
- if (claimed_bdev)
- bd_abort_claiming(bdev, claimed_bdev, xloop_configure);
-#else
if (!(mode & FMODE_EXCL))
- blkdev_put(bdev, mode | FMODE_EXCL);
-#endif
+ bd_abort_claiming(bdev, xloop_configure);
out_putf:
fput(file);
-out:
/* This is safe: open() is still holding a reference. */
module_put(THIS_MODULE);
return error;
@@ -933,8 +1042,21 @@ static int __xloop_clr_fd(struct xloop_device *xlo, bool release)
int err = 0;
bool partscan = false;
int xlo_number;
+ struct xloop_worker *pos, *worker;
- mutex_lock(&xloop_ctl_mutex);
+ /*
+ * Flush xloop_configure() and xloop_change_fd(). It is acceptable for
+ * xloop_validate_file() to succeed, for actual clear operation has not
+ * started yet.
+ */
+ mutex_lock(&xloop_validate_mutex);
+ mutex_unlock(&xloop_validate_mutex);
+ /*
+ * xloop_validate_file() now fails because l->xlo_state != Xlo_bound
+ * became visible.
+ */
+
+ mutex_lock(&xlo->xlo_mutex);
if (WARN_ON_ONCE(xlo->xlo_state != Xlo_rundown)) {
err = -ENXIO;
goto out_unlock;
@@ -946,11 +1068,26 @@ static int __xloop_clr_fd(struct xloop_device *xlo, bool release)
goto out_unlock;
}
+ if (test_bit(QUEUE_FLAG_WC, &xlo->xlo_queue->queue_flags))
+ blk_queue_write_cache(xlo->xlo_queue, false, false);
+
/* freeze request queue during the transition */
blk_mq_freeze_queue(xlo->xlo_queue);
xloop_file_fmt_exit(xlo->xlo_fmt);
+ destroy_workqueue(xlo->workqueue);
+ spin_lock_irq(&xlo->xlo_work_lock);
+ list_for_each_entry_safe(worker, pos, &xlo->idle_worker_list,
+ idle_list) {
+ list_del(&worker->idle_list);
+ rb_erase(&worker->rb_node, &xlo->worker_tree);
+ css_put(worker->blkcg_css);
+ kfree(worker);
+ }
+ spin_unlock_irq(&xlo->xlo_work_lock);
+ del_timer_sync(&xlo->timer);
+
spin_lock_irq(&xlo->xlo_lock);
xlo->xlo_backing_file = NULL;
spin_unlock_irq(&xlo->xlo_lock);
@@ -970,18 +1107,12 @@ static int __xloop_clr_fd(struct xloop_device *xlo, bool release)
blk_queue_physical_block_size(xlo->xlo_queue, 512);
blk_queue_io_min(xlo->xlo_queue, 512);
if (bdev) {
- bdput(bdev);
invalidate_bdev(bdev);
bdev->bd_inode->i_mapping->wb_err = 0;
}
set_capacity(xlo->xlo_disk, 0);
xloop_sysfs_exit(xlo);
if (bdev) {
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 10, 0)
- bd_set_nr_sectors(bdev, 0);
-#else
- bd_set_size(bdev, 0);
-#endif
/* let user-space know about this change */
kobject_uevent(&disk_to_dev(bdev->bd_disk)->kobj, KOBJ_CHANGE);
}
@@ -992,32 +1123,27 @@ static int __xloop_clr_fd(struct xloop_device *xlo, bool release)
partscan = xlo->xlo_flags & XLO_FLAGS_PARTSCAN && bdev;
xlo_number = xlo->xlo_number;
- xloop_unprepare_queue(xlo);
+ disk_force_media_change(xlo->xlo_disk, DISK_EVENT_MEDIA_CHANGE);
out_unlock:
- mutex_unlock(&xloop_ctl_mutex);
+ mutex_unlock(&xlo->xlo_mutex);
if (partscan) {
/*
- * bd_mutex has been held already in release path, so don't
+ * open_mutex has been held already in release path, so don't
* acquire it if this function is called in such case.
*
* If the reread partition isn't from release path, xlo_refcnt
* must be at least one and it can only become zero when the
* current holder is released.
*/
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 5, 0) || RHEL_CHECK_VERSION(RHEL_RELEASE_VERSION(8, 3) <= RHEL_RELEASE_CODE)
if (!release)
- mutex_lock(&bdev->bd_mutex);
- err = bdev_disk_changed(bdev, false);
-#else
- err = blkdev_reread_part(bdev);
-#endif
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 5, 0)
+ mutex_lock(&xlo->xlo_disk->open_mutex);
+ err = bdev_disk_changed(xlo->xlo_disk, false);
if (!release)
- mutex_unlock(&bdev->bd_mutex);
-#endif
+ mutex_unlock(&xlo->xlo_disk->open_mutex);
if (err)
- dev_warn(xloop_device_to_dev(xlo), "partition scan failed (rc=%d)\n", err);
-
+ dev_warn(xloop_device_to_dev(xlo),
+ "partition scan of xloop%d failed (rc=%d)\n",
+ xlo_number, err);
/* Device is gone, no point in returning error */
err = 0;
}
@@ -1031,18 +1157,17 @@ out_unlock:
* protects us from all the other places trying to change the 'xlo'
* device.
*/
- mutex_lock(&xloop_ctl_mutex);
+ mutex_lock(&xlo->xlo_mutex);
xlo->xlo_flags = 0;
if (!part_shift)
xlo->xlo_disk->flags |= GENHD_FL_NO_PART_SCAN;
xlo->xlo_state = Xlo_unbound;
- mutex_unlock(&xloop_ctl_mutex);
+ mutex_unlock(&xlo->xlo_mutex);
/*
- * Need not hold xloop_ctl_mutex to fput backing file.
- * Calling fput holding xloop_ctl_mutex triggers a circular
- * lock dependency possibility warning as fput can take
- * bd_mutex which is usually taken before xloop_ctl_mutex.
+ * Need not hold xlo_mutex to fput backing file. Calling fput holding
+ * xlo_mutex triggers a circular lock dependency possibility warning as
+ * fput can take open_mutex which is usually taken before xlo_mutex.
*/
if (filp)
fput(filp);
@@ -1053,11 +1178,11 @@ static int xloop_clr_fd(struct xloop_device *xlo)
{
int err;
- err = mutex_lock_killable(&xloop_ctl_mutex);
+ err = mutex_lock_killable(&xlo->xlo_mutex);
if (err)
return err;
if (xlo->xlo_state != Xlo_bound) {
- mutex_unlock(&xloop_ctl_mutex);
+ mutex_unlock(&xlo->xlo_mutex);
return -ENXIO;
}
/*
@@ -1066,34 +1191,36 @@ static int xloop_clr_fd(struct xloop_device *xlo)
* the last reference goes away. This stops $!~#$@ udev from
* preventing teardown because it decided that it needs to run blkid on
* the xloopback device whenever they appear. xfstests is notorious for
- * failing tests because blkid via udev races with a losetup
- * <dev>/do something like mkfs/losetup -d <dev> causing the losetup -d
+ * failing tests because blkid via udev races with a xlosetup
+ * <dev>/do something like mkfs/xlosetup -d <dev> causing the xlosetup -d
* command to fail with EBUSY.
*/
if (atomic_read(&xlo->xlo_refcnt) > 1) {
xlo->xlo_flags |= XLO_FLAGS_AUTOCLEAR;
- mutex_unlock(&xloop_ctl_mutex);
+ mutex_unlock(&xlo->xlo_mutex);
return 0;
}
xlo->xlo_state = Xlo_rundown;
- mutex_unlock(&xloop_ctl_mutex);
+ mutex_unlock(&xlo->xlo_mutex);
return __xloop_clr_fd(xlo, false);
}
-static int xloop_set_status(struct xloop_device *xlo, const struct xloop_info64 *info)
+static int
+xloop_set_status(struct xloop_device *xlo, const struct xloop_info64 *info)
{
int err;
- struct block_device *bdev;
kuid_t uid = current_uid();
int prev_xlo_flags;
bool partscan = false;
bool size_changed = false;
- err = mutex_lock_killable(&xloop_ctl_mutex);
+ err = mutex_lock_killable(&xlo->xlo_mutex);
if (err)
return err;
- if (xlo->xlo_encrypt_key_size && !uid_eq(xlo->xlo_key_owner, uid) && !capable(CAP_SYS_ADMIN)) {
+ if (xlo->xlo_encrypt_key_size &&
+ !uid_eq(xlo->xlo_key_owner, uid) &&
+ !capable(CAP_SYS_ADMIN)) {
err = -EPERM;
goto out_unlock;
}
@@ -1102,7 +1229,8 @@ static int xloop_set_status(struct xloop_device *xlo, const struct xloop_info64
goto out_unlock;
}
- if (xlo->xlo_offset != info->xlo_offset || xlo->xlo_sizelimit != info->xlo_sizelimit) {
+ if (xlo->xlo_offset != info->xlo_offset ||
+ xlo->xlo_sizelimit != info->xlo_sizelimit) {
size_changed = true;
sync_blockdev(xlo->xlo_device);
invalidate_bdev(xlo->xlo_device);
@@ -1115,8 +1243,9 @@ static int xloop_set_status(struct xloop_device *xlo, const struct xloop_info64
/* If any pages were dirtied after invalidate_bdev(), try again */
err = -EAGAIN;
dev_warn(xloop_device_to_dev(xlo),
- "xloop device has still dirty pages (nrpages=%lu)\n",
- xlo->xlo_device->bd_inode->i_mapping->nrpages);
+ "xloop%d (%s) has still dirty pages (nrpages=%lu)\n",
+ xlo->xlo_number, xlo->xlo_file_name,
+ xlo->xlo_device->bd_inode->i_mapping->nrpages);
goto out_unfreeze;
}
@@ -1157,30 +1286,31 @@ static int xloop_set_status(struct xloop_device *xlo, const struct xloop_info64
out_unfreeze:
blk_mq_unfreeze_queue(xlo->xlo_queue);
- if (!err && (xlo->xlo_flags & XLO_FLAGS_PARTSCAN) && !(prev_xlo_flags & XLO_FLAGS_PARTSCAN)) {
+ if (!err && (xlo->xlo_flags & XLO_FLAGS_PARTSCAN) &&
+ !(prev_xlo_flags & XLO_FLAGS_PARTSCAN)) {
xlo->xlo_disk->flags &= ~GENHD_FL_NO_PART_SCAN;
- bdev = xlo->xlo_device;
partscan = true;
}
out_unlock:
- mutex_unlock(&xloop_ctl_mutex);
+ mutex_unlock(&xlo->xlo_mutex);
if (partscan)
- xloop_reread_partitions(xlo, bdev);
+ xloop_reread_partitions(xlo);
return err;
}
-static int xloop_get_status(struct xloop_device *xlo, struct xloop_info64 *info)
+static int
+xloop_get_status(struct xloop_device *xlo, struct xloop_info64 *info)
{
struct path path;
struct kstat stat;
int ret;
- ret = mutex_lock_killable(&xloop_ctl_mutex);
+ ret = mutex_lock_killable(&xlo->xlo_mutex);
if (ret)
return ret;
if (xlo->xlo_state != Xlo_bound) {
- mutex_unlock(&xloop_ctl_mutex);
+ mutex_unlock(&xlo->xlo_mutex);
return -ENXIO;
}
@@ -1191,16 +1321,18 @@ static int xloop_get_status(struct xloop_device *xlo, struct xloop_info64 *info)
info->xlo_flags = xlo->xlo_flags;
memcpy(info->xlo_file_name, xlo->xlo_file_name, XLO_NAME_SIZE);
memcpy(info->xlo_crypt_name, xlo->xlo_crypt_name, XLO_NAME_SIZE);
- info->xlo_encrypt_type = xlo->xlo_encryption ? xlo->xlo_encryption->number : 0;
+ info->xlo_encrypt_type =
+ xlo->xlo_encryption ? xlo->xlo_encryption->number : 0;
if (xlo->xlo_encrypt_key_size && capable(CAP_SYS_ADMIN)) {
info->xlo_encrypt_key_size = xlo->xlo_encrypt_key_size;
- memcpy(info->xlo_encrypt_key, xlo->xlo_encrypt_key, xlo->xlo_encrypt_key_size);
+ memcpy(info->xlo_encrypt_key, xlo->xlo_encrypt_key,
+ xlo->xlo_encrypt_key_size);
}
- /* Drop xloop_ctl_mutex while we call into the filesystem. */
+ /* Drop xlo_mutex while we call into the filesystem. */
path = xlo->xlo_backing_file->f_path;
path_get(&path);
- mutex_unlock(&xloop_ctl_mutex);
+ mutex_unlock(&xlo->xlo_mutex);
ret = vfs_getattr(&path, &stat, STATX_INO, AT_STATX_SYNC_AS_STAT);
if (!ret) {
info->xlo_device = huge_encode_dev(stat.dev);
@@ -1211,7 +1343,8 @@ static int xloop_get_status(struct xloop_device *xlo, struct xloop_info64 *info)
return ret;
}
-static void xloop_info64_from_old(const struct xloop_info *info, struct xloop_info64 *info64)
+static void
+xloop_info64_from_old(const struct xloop_info *info, struct xloop_info64 *info64)
{
memset(info64, 0, sizeof(*info64));
info64->xlo_number = info->xlo_number;
@@ -1225,7 +1358,6 @@ static void xloop_info64_from_old(const struct xloop_info *info, struct xloop_in
info64->xlo_flags = info->xlo_flags;
info64->xlo_init[0] = info->xlo_init[0];
info64->xlo_init[1] = info->xlo_init[1];
- info64->xlo_file_fmt_type = info->xlo_file_fmt_type;
if (info->xlo_encrypt_type == XLO_CRYPT_CRYPTOAPI)
memcpy(info64->xlo_crypt_name, info->xlo_name, XLO_NAME_SIZE);
else
@@ -1233,7 +1365,8 @@ static void xloop_info64_from_old(const struct xloop_info *info, struct xloop_in
memcpy(info64->xlo_encrypt_key, info->xlo_encrypt_key, XLO_KEY_SIZE);
}
-static int xloop_info64_to_old(const struct xloop_info64 *info64, struct xloop_info *info)
+static int
+xloop_info64_to_old(const struct xloop_info64 *info64, struct xloop_info *info)
{
memset(info, 0, sizeof(*info));
info->xlo_number = info64->xlo_number;
@@ -1246,7 +1379,6 @@ static int xloop_info64_to_old(const struct xloop_info64 *info64, struct xloop_i
info->xlo_flags = info64->xlo_flags;
info->xlo_init[0] = info64->xlo_init[0];
info->xlo_init[1] = info64->xlo_init[1];
- info->xlo_file_fmt_type = info64->xlo_file_fmt_type;
if (info->xlo_encrypt_type == XLO_CRYPT_CRYPTOAPI)
memcpy(info->xlo_name, info64->xlo_crypt_name, XLO_NAME_SIZE);
else
@@ -1254,35 +1386,39 @@ static int xloop_info64_to_old(const struct xloop_info64 *info64, struct xloop_i
memcpy(info->xlo_encrypt_key, info64->xlo_encrypt_key, XLO_KEY_SIZE);
/* error in case values were truncated */
- if (info->xlo_device != info64->xlo_device || info->xlo_rdevice != info64->xlo_rdevice ||
- info->xlo_inode != info64->xlo_inode || info->xlo_offset != info64->xlo_offset)
+ if (info->xlo_device != info64->xlo_device ||
+ info->xlo_rdevice != info64->xlo_rdevice ||
+ info->xlo_inode != info64->xlo_inode ||
+ info->xlo_offset != info64->xlo_offset)
return -EOVERFLOW;
return 0;
}
-static int xloop_set_status_old(struct xloop_device *xlo, const struct xloop_info __user *arg)
+static int
+xloop_set_status_old(struct xloop_device *xlo, const struct xloop_info __user *arg)
{
struct xloop_info info;
struct xloop_info64 info64;
- if (copy_from_user(&info, arg, sizeof(struct xloop_info)))
+ if (copy_from_user(&info, arg, sizeof (struct xloop_info)))
return -EFAULT;
xloop_info64_from_old(&info, &info64);
return xloop_set_status(xlo, &info64);
}
-static int xloop_set_status64(struct xloop_device *xlo, const struct xloop_info64 __user *arg)
+static int
+xloop_set_status64(struct xloop_device *xlo, const struct xloop_info64 __user *arg)
{
struct xloop_info64 info64;
- if (copy_from_user(&info64, arg, sizeof(struct xloop_info64)))
+ if (copy_from_user(&info64, arg, sizeof (struct xloop_info64)))
return -EFAULT;
return xloop_set_status(xlo, &info64);
}
-static int xloop_get_status_old(struct xloop_device *xlo, struct xloop_info __user *arg)
-{
+static int
+xloop_get_status_old(struct xloop_device *xlo, struct xloop_info __user *arg) {
struct xloop_info info;
struct xloop_info64 info64;
int err;
@@ -1298,8 +1434,8 @@ static int xloop_get_status_old(struct xloop_device *xlo, struct xloop_info __us
return err;
}
-static int xloop_get_status64(struct xloop_device *xlo, struct xloop_info64 __user *arg)
-{
+static int
+xloop_get_status64(struct xloop_device *xlo, struct xloop_info64 __user *arg) {
struct xloop_info64 info64;
int err;
@@ -1328,7 +1464,6 @@ static int xloop_set_capacity(struct xloop_device *xlo)
static int xloop_set_dio(struct xloop_device *xlo, unsigned long arg)
{
int error = -ENXIO;
-
if (xlo->xlo_state != Xlo_bound)
goto out;
@@ -1336,7 +1471,7 @@ static int xloop_set_dio(struct xloop_device *xlo, unsigned long arg)
if (xlo->use_dio == !!arg)
return 0;
error = -EINVAL;
-out:
+ out:
return error;
}
@@ -1347,7 +1482,7 @@ static int xloop_set_block_size(struct xloop_device *xlo, unsigned long arg)
if (xlo->xlo_state != Xlo_bound)
return -ENXIO;
- err = xloop_validate_block_size(arg);
+ err = blk_validate_block_size(arg);
if (err)
return err;
@@ -1363,8 +1498,9 @@ static int xloop_set_block_size(struct xloop_device *xlo, unsigned long arg)
if (xlo->xlo_device->bd_inode->i_mapping->nrpages) {
err = -EAGAIN;
dev_warn(xloop_device_to_dev(xlo),
- "xloop device has still dirty pages (nrpages=%lu)\n",
- xlo->xlo_device->bd_inode->i_mapping->nrpages);
+ "xloop%d (%s) has still dirty pages (nrpages=%lu)\n",
+ xlo->xlo_number, xlo->xlo_file_name,
+ xlo->xlo_device->bd_inode->i_mapping->nrpages);
goto out_unfreeze;
}
@@ -1378,11 +1514,12 @@ out_unfreeze:
return err;
}
-static int xlo_simple_ioctl(struct xloop_device *xlo, unsigned int cmd, unsigned long arg)
+static int xlo_simple_ioctl(struct xloop_device *xlo, unsigned int cmd,
+ unsigned long arg)
{
int err;
- err = mutex_lock_killable(&xloop_ctl_mutex);
+ err = mutex_lock_killable(&xlo->xlo_mutex);
if (err)
return err;
switch (cmd) {
@@ -1398,14 +1535,15 @@ static int xlo_simple_ioctl(struct xloop_device *xlo, unsigned int cmd, unsigned
default:
err = xlo->ioctl ? xlo->ioctl(xlo, cmd, arg) : -EINVAL;
}
- mutex_unlock(&xloop_ctl_mutex);
+ mutex_unlock(&xlo->xlo_mutex);
return err;
}
-static int xlo_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, unsigned long arg)
+static int xlo_ioctl(struct block_device *bdev, fmode_t mode,
+ unsigned int cmd, unsigned long arg)
{
struct xloop_device *xlo = bdev->bd_disk->private_data;
- void __user *argp = (void __user *)arg;
+ void __user *argp = (void __user *) arg;
int err;
switch (cmd) {
@@ -1436,15 +1574,17 @@ static int xlo_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd,
return xloop_clr_fd(xlo);
case XLOOP_SET_STATUS:
err = -EPERM;
- if ((mode & FMODE_WRITE) || capable(CAP_SYS_ADMIN))
+ if ((mode & FMODE_WRITE) || capable(CAP_SYS_ADMIN)) {
err = xloop_set_status_old(xlo, argp);
+ }
break;
case XLOOP_GET_STATUS:
return xloop_get_status_old(xlo, argp);
case XLOOP_SET_STATUS64:
err = -EPERM;
- if ((mode & FMODE_WRITE) || capable(CAP_SYS_ADMIN))
+ if ((mode & FMODE_WRITE) || capable(CAP_SYS_ADMIN)) {
err = xloop_set_status64(xlo, argp);
+ }
break;
case XLOOP_GET_STATUS64:
return xloop_get_status64(xlo, argp);
@@ -1453,11 +1593,7 @@ static int xlo_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd,
case XLOOP_SET_BLOCK_SIZE:
if (!(mode & FMODE_WRITE) && !capable(CAP_SYS_ADMIN))
return -EPERM;
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 4, 0)
fallthrough;
-#else
- /* fall through */
-#endif
default:
err = xlo_simple_ioctl(xlo, cmd, arg);
break;
@@ -1468,26 +1604,27 @@ static int xlo_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd,
#ifdef CONFIG_COMPAT
struct compat_xloop_info {
- compat_int_t xlo_number; /* ioctl r/o */
- compat_dev_t xlo_device; /* ioctl r/o */
- compat_ulong_t xlo_inode; /* ioctl r/o */
- compat_dev_t xlo_rdevice; /* ioctl r/o */
- compat_int_t xlo_offset;
- compat_int_t xlo_encrypt_type;
- compat_int_t xlo_encrypt_key_size; /* ioctl w/o */
- compat_int_t xlo_flags; /* ioctl r/o */
- char xlo_name[XLO_NAME_SIZE];
- unsigned char xlo_encrypt_key[XLO_KEY_SIZE]; /* ioctl w/o */
- compat_ulong_t xlo_init[2];
- char reserved[4];
- compat_int_t xlo_file_fmt_type;
+ compat_int_t xlo_number; /* ioctl r/o */
+ compat_dev_t xlo_device; /* ioctl r/o */
+ compat_ulong_t xlo_inode; /* ioctl r/o */
+ compat_dev_t xlo_rdevice; /* ioctl r/o */
+ compat_int_t xlo_offset;
+ compat_int_t xlo_encrypt_type;
+ compat_int_t xlo_encrypt_key_size; /* ioctl w/o */
+ compat_int_t xlo_flags; /* ioctl r/o */
+ char xlo_name[XLO_NAME_SIZE];
+ unsigned char xlo_encrypt_key[XLO_KEY_SIZE]; /* ioctl w/o */
+ compat_ulong_t xlo_init[2];
+ char reserved[4];
};
/*
* Transfer 32-bit compatibility structure in userspace to 64-bit xloop info
* - noinlined to reduce stack space usage in main part of driver
*/
-static noinline int xloop_info64_from_compat(const struct compat_xloop_info __user *arg, struct xloop_info64 *info64)
+static noinline int
+xloop_info64_from_compat(const struct compat_xloop_info __user *arg,
+ struct xloop_info64 *info64)
{
struct compat_xloop_info info;
@@ -1506,7 +1643,6 @@ static noinline int xloop_info64_from_compat(const struct compat_xloop_info __us
info64->xlo_flags = info.xlo_flags;
info64->xlo_init[0] = info.xlo_init[0];
info64->xlo_init[1] = info.xlo_init[1];
- info64->xlo_file_fmt_type = info.xlo_file_fmt_type;
if (info.xlo_encrypt_type == XLO_CRYPT_CRYPTOAPI)
memcpy(info64->xlo_crypt_name, info.xlo_name, XLO_NAME_SIZE);
else
@@ -1519,7 +1655,9 @@ static noinline int xloop_info64_from_compat(const struct compat_xloop_info __us
* Transfer 64-bit xloop info to 32-bit compatibility structure in userspace
* - noinlined to reduce stack space usage in main part of driver
*/
-static noinline int xloop_info64_to_compat(const struct xloop_info64 *info64, struct compat_xloop_info __user *arg)
+static noinline int
+xloop_info64_to_compat(const struct xloop_info64 *info64,
+ struct compat_xloop_info __user *arg)
{
struct compat_xloop_info info;
@@ -1534,7 +1672,6 @@ static noinline int xloop_info64_to_compat(const struct xloop_info64 *info64, st
info.xlo_flags = info64->xlo_flags;
info.xlo_init[0] = info64->xlo_init[0];
info.xlo_init[1] = info64->xlo_init[1];
- info.xlo_file_fmt_type = info64->xlo_file_fmt_type;
if (info.xlo_encrypt_type == XLO_CRYPT_CRYPTOAPI)
memcpy(info.xlo_name, info64->xlo_crypt_name, XLO_NAME_SIZE);
else
@@ -1542,10 +1679,12 @@ static noinline int xloop_info64_to_compat(const struct xloop_info64 *info64, st
memcpy(info.xlo_encrypt_key, info64->xlo_encrypt_key, XLO_KEY_SIZE);
/* error in case values were truncated */
- if (info.xlo_device != info64->xlo_device || info.xlo_rdevice != info64->xlo_rdevice ||
- info.xlo_inode != info64->xlo_inode || info.xlo_offset != info64->xlo_offset ||
- info.xlo_init[0] != info64->xlo_init[0] || info.xlo_init[1] != info64->xlo_init[1] ||
- info.xlo_file_fmt_type != info64->xlo_file_fmt_type)
+ if (info.xlo_device != info64->xlo_device ||
+ info.xlo_rdevice != info64->xlo_rdevice ||
+ info.xlo_inode != info64->xlo_inode ||
+ info.xlo_offset != info64->xlo_offset ||
+ info.xlo_init[0] != info64->xlo_init[0] ||
+ info.xlo_init[1] != info64->xlo_init[1])
return -EOVERFLOW;
if (copy_to_user(arg, &info, sizeof(info)))
@@ -1553,7 +1692,9 @@ static noinline int xloop_info64_to_compat(const struct xloop_info64 *info64, st
return 0;
}
-static int xloop_set_status_compat(struct xloop_device *xlo, const struct compat_xloop_info __user *arg)
+static int
+xloop_set_status_compat(struct xloop_device *xlo,
+ const struct compat_xloop_info __user *arg)
{
struct xloop_info64 info64;
int ret;
@@ -1564,7 +1705,9 @@ static int xloop_set_status_compat(struct xloop_device *xlo, const struct compat
return xloop_set_status(xlo, &info64);
}
-static int xloop_get_status_compat(struct xloop_device *xlo, struct compat_xloop_info __user *arg)
+static int
+xloop_get_status_compat(struct xloop_device *xlo,
+ struct compat_xloop_info __user *arg)
{
struct xloop_info64 info64;
int err;
@@ -1577,29 +1720,28 @@ static int xloop_get_status_compat(struct xloop_device *xlo, struct compat_xloop
return err;
}
-static int xlo_compat_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, unsigned long arg)
+static int xlo_compat_ioctl(struct block_device *bdev, fmode_t mode,
+ unsigned int cmd, unsigned long arg)
{
struct xloop_device *xlo = bdev->bd_disk->private_data;
int err;
- switch (cmd) {
+ switch(cmd) {
case XLOOP_SET_STATUS:
- err = xloop_set_status_compat(xlo, (const struct compat_xloop_info __user *)arg);
+ err = xloop_set_status_compat(xlo,
+ (const struct compat_xloop_info __user *)arg);
break;
case XLOOP_GET_STATUS:
- err = xloop_get_status_compat(xlo, (struct compat_xloop_info __user *)arg);
+ err = xloop_get_status_compat(xlo,
+ (struct compat_xloop_info __user *)arg);
break;
case XLOOP_SET_CAPACITY:
case XLOOP_CLR_FD:
case XLOOP_GET_STATUS64:
case XLOOP_SET_STATUS64:
case XLOOP_CONFIGURE:
- arg = (unsigned long)compat_ptr(arg);
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 4, 0)
+ arg = (unsigned long) compat_ptr(arg);
fallthrough;
-#else
- /* fall through */
-#endif
case XLOOP_SET_FD:
case XLOOP_CHANGE_FD:
case XLOOP_SET_BLOCK_SIZE:
@@ -1616,30 +1758,25 @@ static int xlo_compat_ioctl(struct block_device *bdev, fmode_t mode, unsigned in
static int xlo_open(struct block_device *bdev, fmode_t mode)
{
- struct xloop_device *xlo;
+ struct xloop_device *xlo = bdev->bd_disk->private_data;
int err;
- err = mutex_lock_killable(&xloop_ctl_mutex);
+ err = mutex_lock_killable(&xlo->xlo_mutex);
if (err)
return err;
- xlo = bdev->bd_disk->private_data;
- if (!xlo) {
+ if (xlo->xlo_state == Xlo_deleting)
err = -ENXIO;
- goto out;
- }
-
- atomic_inc(&xlo->xlo_refcnt);
-out:
- mutex_unlock(&xloop_ctl_mutex);
+ else
+ atomic_inc(&xlo->xlo_refcnt);
+ mutex_unlock(&xlo->xlo_mutex);
return err;
}
static void xlo_release(struct gendisk *disk, fmode_t mode)
{
- struct xloop_device *xlo;
+ struct xloop_device *xlo = disk->private_data;
- mutex_lock(&xloop_ctl_mutex);
- xlo = disk->private_data;
+ mutex_lock(&xlo->xlo_mutex);
if (atomic_dec_return(&xlo->xlo_refcnt))
goto out_unlock;
@@ -1647,7 +1784,7 @@ static void xlo_release(struct gendisk *disk, fmode_t mode)
if (xlo->xlo_state != Xlo_bound)
goto out_unlock;
xlo->xlo_state = Xlo_rundown;
- mutex_unlock(&xloop_ctl_mutex);
+ mutex_unlock(&xlo->xlo_mutex);
/*
* In autoclear mode, stop the xloop thread
* and remove configuration after last close.
@@ -1664,16 +1801,16 @@ static void xlo_release(struct gendisk *disk, fmode_t mode)
}
out_unlock:
- mutex_unlock(&xloop_ctl_mutex);
+ mutex_unlock(&xlo->xlo_mutex);
}
static const struct block_device_operations xlo_fops = {
- .owner = THIS_MODULE,
- .open = xlo_open,
- .release = xlo_release,
- .ioctl = xlo_ioctl,
+ .owner = THIS_MODULE,
+ .open = xlo_open,
+ .release = xlo_release,
+ .ioctl = xlo_ioctl,
#ifdef CONFIG_COMPAT
- .compat_ioctl = xlo_compat_ioctl,
+ .compat_ioctl = xlo_compat_ioctl,
#endif
};
@@ -1699,37 +1836,36 @@ int xloop_register_transfer(struct xloop_func_table *funcs)
xfer_funcs[n] = funcs;
return 0;
}
-EXPORT_SYMBOL(xloop_register_transfer);
-
-static int unregister_transfer_cb(int id, void *ptr, void *data)
-{
- struct xloop_device *xlo = ptr;
- struct xloop_func_table *xfer = data;
-
- mutex_lock(&xloop_ctl_mutex);
- if (xlo->xlo_encryption == xfer)
- xloop_release_xfer(xlo);
- mutex_unlock(&xloop_ctl_mutex);
- return 0;
-}
int xloop_unregister_transfer(int number)
{
unsigned int n = number;
struct xloop_func_table *xfer;
- xfer = xfer_funcs[n];
-
- if (n == 0 || n >= MAX_XLO_CRYPT || xfer == NULL)
+ if (n == 0 || n >= MAX_XLO_CRYPT || (xfer = xfer_funcs[n]) == NULL)
return -EINVAL;
+ /*
+ * This function is called from only cleanup_cryptoxloop().
+ * Given that each xloop device that has a transfer enabled holds a
+ * reference to the module implementing it we should never get here
+ * with a transfer that is set (unless forced module unloading is
+ * requested). Thus, check module's refcount and warn if this is
+ * not a clean unloading.
+ */
+#ifdef CONFIG_MODULE_UNLOAD
+ if (xfer->owner && module_refcount(xfer->owner) != -1)
+ pr_err("Danger! Unregistering an in use transfer function.\n");
+#endif
xfer_funcs[n] = NULL;
- idr_for_each(&xloop_index_idr, &unregister_transfer_cb, xfer);
return 0;
}
+
+EXPORT_SYMBOL(xloop_register_transfer);
EXPORT_SYMBOL(xloop_unregister_transfer);
-static blk_status_t xloop_queue_rq(struct blk_mq_hw_ctx *hctx, const struct blk_mq_queue_data *bd)
+static blk_status_t xloop_queue_rq(struct blk_mq_hw_ctx *hctx,
+ const struct blk_mq_queue_data *bd)
{
struct request *rq = bd->rq;
struct xloop_cmd *cmd = blk_mq_rq_to_pdu(rq);
@@ -1752,14 +1888,19 @@ static blk_status_t xloop_queue_rq(struct blk_mq_hw_ctx *hctx, const struct blk_
}
/* always use the first bio's css */
+ cmd->blkcg_css = NULL;
+ cmd->memcg_css = NULL;
#ifdef CONFIG_BLK_CGROUP
- if (cmd->use_aio && rq->bio && rq->bio->bi_blkg) {
- cmd->css = &bio_blkcg(rq->bio)->css;
- css_get(cmd->css);
- } else
+ if (rq->bio && rq->bio->bi_blkg) {
+ cmd->blkcg_css = &bio_blkcg(rq->bio)->css;
+#ifdef CONFIG_MEMCG
+ cmd->memcg_css =
+ cgroup_get_e_css(cmd->blkcg_css->cgroup,
+ &memory_cgrp_subsys);
#endif
- cmd->css = NULL;
- kthread_queue_work(&xlo->worker, &cmd->work);
+ }
+#endif
+ xloop_queue_work(xlo, cmd);
return BLK_STS_OK;
}
@@ -1770,54 +1911,122 @@ static void xloop_handle_cmd(struct xloop_cmd *cmd)
const bool write = op_is_write(req_op(rq));
struct xloop_device *xlo = rq->q->queuedata;
int ret = 0;
+ struct mem_cgroup *old_memcg = NULL;
if (write && (xlo->xlo_flags & XLO_FLAGS_READ_ONLY)) {
ret = -EIO;
goto failed;
}
+ if (cmd->blkcg_css)
+ kthread_associate_blkcg(cmd->blkcg_css);
+ if (cmd->memcg_css)
+ old_memcg = set_active_memcg(
+ mem_cgroup_from_css(cmd->memcg_css));
+
ret = do_req_filebacked(xlo, rq);
-failed:
+
+ if (cmd->blkcg_css)
+ kthread_associate_blkcg(NULL);
+
+ if (cmd->memcg_css) {
+ set_active_memcg(old_memcg);
+ css_put(cmd->memcg_css);
+ }
+ failed:
/* complete non-aio request */
if (!cmd->use_aio || ret) {
if (ret == -EOPNOTSUPP)
cmd->ret = ret;
else
cmd->ret = ret ? -EIO : 0;
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 9, 0)
if (likely(!blk_should_fake_timeout(rq->q)))
blk_mq_complete_request(rq);
-#else
- blk_mq_complete_request(rq);
-#endif
}
}
-static void xloop_queue_work(struct kthread_work *work)
+static void xloop_set_timer(struct xloop_device *xlo)
+{
+ timer_reduce(&xlo->timer, jiffies + XLOOP_IDLE_WORKER_TIMEOUT);
+}
+
+static void xloop_process_work(struct xloop_worker *worker,
+ struct list_head *cmd_list, struct xloop_device *xlo)
+{
+ int orig_flags = current->flags;
+ struct xloop_cmd *cmd;
+
+ current->flags |= PF_LOCAL_THROTTLE | PF_MEMALLOC_NOIO;
+ spin_lock_irq(&xlo->xlo_work_lock);
+ while (!list_empty(cmd_list)) {
+ cmd = container_of(
+ cmd_list->next, struct xloop_cmd, list_entry);
+ list_del(cmd_list->next);
+ spin_unlock_irq(&xlo->xlo_work_lock);
+
+ xloop_handle_cmd(cmd);
+ cond_resched();
+
+ spin_lock_irq(&xlo->xlo_work_lock);
+ }
+
+ /*
+ * We only add to the idle list if there are no pending cmds
+ * *and* the worker will not run again which ensures that it
+ * is safe to free any worker on the idle list
+ */
+ if (worker && !work_pending(&worker->work)) {
+ worker->last_ran_at = jiffies;
+ list_add_tail(&worker->idle_list, &xlo->idle_worker_list);
+ xloop_set_timer(xlo);
+ }
+ spin_unlock_irq(&xlo->xlo_work_lock);
+ current->flags = orig_flags;
+}
+
+static void xloop_workfn(struct work_struct *work)
{
- struct xloop_cmd *cmd = container_of(work, struct xloop_cmd, work);
+ struct xloop_worker *worker =
+ container_of(work, struct xloop_worker, work);
+ xloop_process_work(worker, &worker->cmd_list, worker->xlo);
+}
- xloop_handle_cmd(cmd);
+static void xloop_rootcg_workfn(struct work_struct *work)
+{
+ struct xloop_device *xlo =
+ container_of(work, struct xloop_device, rootcg_work);
+ xloop_process_work(NULL, &xlo->rootcg_cmd_list, xlo);
}
-static int xloop_init_request(struct blk_mq_tag_set *set, struct request *rq, unsigned int hctx_idx,
- unsigned int numa_node)
+static void xloop_free_idle_workers(struct timer_list *timer)
{
- struct xloop_cmd *cmd = blk_mq_rq_to_pdu(rq);
+ struct xloop_device *xlo = container_of(timer, struct xloop_device, timer);
+ struct xloop_worker *pos, *worker;
- kthread_init_work(&cmd->work, xloop_queue_work);
- return 0;
+ spin_lock_irq(&xlo->xlo_work_lock);
+ list_for_each_entry_safe(worker, pos, &xlo->idle_worker_list,
+ idle_list) {
+ if (time_is_after_jiffies(worker->last_ran_at +
+ XLOOP_IDLE_WORKER_TIMEOUT))
+ break;
+ list_del(&worker->idle_list);
+ rb_erase(&worker->rb_node, &xlo->worker_tree);
+ css_put(worker->blkcg_css);
+ kfree(worker);
+ }
+ if (!list_empty(&xlo->idle_worker_list))
+ xloop_set_timer(xlo);
+ spin_unlock_irq(&xlo->xlo_work_lock);
}
static const struct blk_mq_ops xloop_mq_ops = {
- .queue_rq = xloop_queue_rq,
- .init_request = xloop_init_request,
- .complete = xlo_complete_rq,
+ .queue_rq = xloop_queue_rq,
+ .complete = xlo_complete_rq,
};
static struct dentry *xloop_dbgfs_dir;
-static int xloop_add(struct xloop_device **l, int i)
+static int xloop_add(int i)
{
struct xloop_device *xlo;
struct gendisk *disk;
@@ -1827,9 +2036,12 @@ static int xloop_add(struct xloop_device **l, int i)
xlo = kzalloc(sizeof(*xlo), GFP_KERNEL);
if (!xlo)
goto out;
-
xlo->xlo_state = Xlo_unbound;
+ err = mutex_lock_killable(&xloop_ctl_mutex);
+ if (err)
+ goto out_free_dev;
+
/* allocate id, if @id >= 0, we're requesting that specific id */
if (i >= 0) {
err = idr_alloc(&xloop_index_idr, xlo, i, i + 1, GFP_KERNEL);
@@ -1838,6 +2050,7 @@ static int xloop_add(struct xloop_device **l, int i)
} else {
err = idr_alloc(&xloop_index_idr, xlo, 0, 0, GFP_KERNEL);
}
+ mutex_unlock(&xloop_ctl_mutex);
if (err < 0)
goto out_free_dev;
i = err;
@@ -1848,23 +2061,20 @@ static int xloop_add(struct xloop_device **l, int i)
xlo->tag_set.queue_depth = 128;
xlo->tag_set.numa_node = NUMA_NO_NODE;
xlo->tag_set.cmd_size = sizeof(struct xloop_cmd);
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 8, 0)
- xlo->tag_set.flags = BLK_MQ_F_SHOULD_MERGE | BLK_MQ_F_STACKING;
-#else
- xlo->tag_set.flags = BLK_MQ_F_SHOULD_MERGE;
-#endif
+ xlo->tag_set.flags = BLK_MQ_F_SHOULD_MERGE | BLK_MQ_F_STACKING |
+ BLK_MQ_F_NO_SCHED_BY_DEFAULT;
xlo->tag_set.driver_data = xlo;
err = blk_mq_alloc_tag_set(&xlo->tag_set);
if (err)
goto out_free_idr;
- xlo->xlo_queue = blk_mq_init_queue(&xlo->tag_set);
- if (IS_ERR(xlo->xlo_queue)) {
- err = PTR_ERR(xlo->xlo_queue);
+ disk = xlo->xlo_disk = blk_mq_alloc_disk(&xlo->tag_set, xlo);
+ if (IS_ERR(disk)) {
+ err = PTR_ERR(disk);
goto out_cleanup_tags;
}
- xlo->xlo_queue->queuedata = xlo;
+ xlo->xlo_queue = xlo->xlo_disk->queue;
blk_queue_max_hw_sectors(xlo->xlo_queue, BLK_DEF_MAX_SECTORS);
@@ -1879,15 +2089,10 @@ static int xloop_add(struct xloop_device **l, int i)
err = -ENOMEM;
xlo->xlo_fmt = xloop_file_fmt_alloc();
if (!xlo->xlo_fmt)
- goto out_free_queue;
+ goto out_cleanup_disk;
xloop_file_fmt_set_xlo(xlo->xlo_fmt, xlo);
- err = -ENOMEM;
- disk = xlo->xlo_disk = alloc_disk(1 << part_shift);
- if (!disk)
- goto out_free_file_fmt;
-
/*
* Disable partition scanning by default. The in-kernel partition
* scanning can be requested individually per-device during its
@@ -1910,21 +2115,30 @@ static int xloop_add(struct xloop_device **l, int i)
disk->flags |= GENHD_FL_NO_PART_SCAN;
disk->flags |= GENHD_FL_EXT_DEVT;
atomic_set(&xlo->xlo_refcnt, 0);
+ mutex_init(&xlo->xlo_mutex);
xlo->xlo_number = i;
spin_lock_init(&xlo->xlo_lock);
+ spin_lock_init(&xlo->xlo_work_lock);
disk->major = XLOOP_MAJOR;
disk->first_minor = i << part_shift;
+ disk->minors = 1 << part_shift;
disk->fops = &xlo_fops;
disk->private_data = xlo;
disk->queue = xlo->xlo_queue;
+ disk->events = DISK_EVENT_MEDIA_CHANGE;
+ disk->event_flags = DISK_EVENT_FLAG_UEVENT;
sprintf(disk->disk_name, "xloop%d", i);
+ /* Make this xloop device reachable from pathname. */
add_disk(disk);
- *l = xlo;
+ /* Show this xloop device. */
+ mutex_lock(&xloop_ctl_mutex);
+ xlo->idr_visible = true;
+ mutex_unlock(&xloop_ctl_mutex);
/*
* initialize debugfs entries
*
- * create for each loop device a debugfs directory under 'loop' if
+ * create for each xloop device a debugfs directory under 'xloop' if
* the 'block' directory exists, otherwise create the loop directory in
* the root directory
*/
@@ -1938,16 +2152,18 @@ static int xloop_add(struct xloop_device **l, int i)
}
#endif
- return xlo->xlo_number;
+ return i;
out_free_file_fmt:
xloop_file_fmt_free(xlo->xlo_fmt);
-out_free_queue:
- blk_cleanup_queue(xlo->xlo_queue);
+out_cleanup_disk:
+ blk_cleanup_disk(xlo->xlo_disk);
out_cleanup_tags:
blk_mq_free_tag_set(&xlo->tag_set);
out_free_idr:
+ mutex_lock(&xloop_ctl_mutex);
idr_remove(&xloop_index_idr, i);
+ mutex_unlock(&xloop_ctl_mutex);
out_free_dev:
kfree(xlo);
out:
@@ -1958,129 +2174,122 @@ static void xloop_remove(struct xloop_device *xlo)
{
xloop_file_fmt_free(xlo->xlo_fmt);
debugfs_remove(xlo->xlo_dbgfs_dir);
+ /* Make this xloop device unreachable from pathname. */
del_gendisk(xlo->xlo_disk);
- blk_cleanup_queue(xlo->xlo_queue);
+ blk_cleanup_disk(xlo->xlo_disk);
blk_mq_free_tag_set(&xlo->tag_set);
- put_disk(xlo->xlo_disk);
+ mutex_lock(&xloop_ctl_mutex);
+ idr_remove(&xloop_index_idr, xlo->xlo_number);
+ mutex_unlock(&xloop_ctl_mutex);
+ /* There is no route which can find this xloop device. */
+ mutex_destroy(&xlo->xlo_mutex);
kfree(xlo);
}
-static int find_free_cb(int id, void *ptr, void *data)
+static void xloop_probe(dev_t dev)
{
- struct xloop_device *xlo = ptr;
- struct xloop_device **l = data;
+ int idx = MINOR(dev) >> part_shift;
- if (xlo->xlo_state == Xlo_unbound) {
- *l = xlo;
- return 1;
- }
- return 0;
+ if (max_xloop && idx >= max_xloop)
+ return;
+ xloop_add(idx);
}
-static int xloop_lookup(struct xloop_device **l, int i)
+static int xloop_control_remove(int idx)
{
struct xloop_device *xlo;
- int ret = -ENODEV;
-
- if (i < 0) {
- int err;
+ int ret;
- err = idr_for_each(&xloop_index_idr, &find_free_cb, &xlo);
- if (err == 1) {
- *l = xlo;
- ret = xlo->xlo_number;
- }
- goto out;
+ if (idx < 0) {
+ pr_warn("deleting an unspecified xloop device is not supported.\n");
+ return -EINVAL;
}
+
+ /* Hide this xloop device for serialization. */
+ ret = mutex_lock_killable(&xloop_ctl_mutex);
+ if (ret)
+ return ret;
+ xlo = idr_find(&xloop_index_idr, idx);
+ if (!xlo || !xlo->idr_visible)
+ ret = -ENODEV;
+ else
+ xlo->idr_visible = false;
+ mutex_unlock(&xloop_ctl_mutex);
+ if (ret)
+ return ret;
- /* lookup and return a specific i */
- xlo = idr_find(&xloop_index_idr, i);
- if (xlo) {
- *l = xlo;
- ret = xlo->xlo_number;
+ /* Check whether this xloop device can be removed. */
+ ret = mutex_lock_killable(&xlo->xlo_mutex);
+ if (ret)
+ goto mark_visible;
+ if (xlo->xlo_state != Xlo_unbound ||
+ atomic_read(&xlo->xlo_refcnt) > 0) {
+ mutex_unlock(&xlo->xlo_mutex);
+ ret = -EBUSY;
+ goto mark_visible;
}
-out:
- return ret;
-}
+ /* Mark this xloop device no longer open()-able. */
+ xlo->xlo_state = Xlo_deleting;
+ mutex_unlock(&xlo->xlo_mutex);
-static struct kobject *xloop_probe(dev_t dev, int *part, void *data)
-{
- struct xloop_device *xlo;
- struct kobject *kobj;
- int err;
+ xloop_remove(xlo);
+ return 0;
+mark_visible:
+ /* Show this xloop device again. */
mutex_lock(&xloop_ctl_mutex);
- err = xloop_lookup(&xlo, MINOR(dev) >> part_shift);
- if (err < 0)
- err = xloop_add(&xlo, MINOR(dev) >> part_shift);
- if (err < 0)
- kobj = NULL;
- else
- kobj = get_disk_and_module(xlo->xlo_disk);
+ xlo->idr_visible = true;
mutex_unlock(&xloop_ctl_mutex);
-
- *part = 0;
- return kobj;
+ return ret;
}
-static long xloop_control_ioctl(struct file *file, unsigned int cmd, unsigned long parm)
+static int xloop_control_get_free(int idx)
{
struct xloop_device *xlo;
- int ret;
+ int id, ret;
ret = mutex_lock_killable(&xloop_ctl_mutex);
if (ret)
return ret;
+ idr_for_each_entry(&xloop_index_idr, xlo, id) {
+ /* Hitting a race results in creating a new xloop device which is harmless. */
+ if (xlo->idr_visible && data_race(xlo->xlo_state) == Xlo_unbound)
+ goto found;
+ }
+ mutex_unlock(&xloop_ctl_mutex);
+ return xloop_add(-1);
+found:
+ mutex_unlock(&xloop_ctl_mutex);
+ return id;
+}
- ret = -EINVAL;
+static long xloop_control_ioctl(struct file *file, unsigned int cmd,
+ unsigned long parm)
+{
switch (cmd) {
case XLOOP_CTL_ADD:
- ret = xloop_lookup(&xlo, parm);
- if (ret >= 0) {
- ret = -EEXIST;
- break;
- }
- ret = xloop_add(&xlo, parm);
- break;
+ return xloop_add(parm);
case XLOOP_CTL_REMOVE:
- ret = xloop_lookup(&xlo, parm);
- if (ret < 0)
- break;
- if (xlo->xlo_state != Xlo_unbound) {
- ret = -EBUSY;
- break;
- }
- if (atomic_read(&xlo->xlo_refcnt) > 0) {
- ret = -EBUSY;
- break;
- }
- xlo->xlo_disk->private_data = NULL;
- idr_remove(&xloop_index_idr, xlo->xlo_number);
- xloop_remove(xlo);
- break;
+ return xloop_control_remove(parm);
case XLOOP_CTL_GET_FREE:
- ret = xloop_lookup(&xlo, -1);
- if (ret >= 0)
- break;
- ret = xloop_add(&xlo, -1);
+ return xloop_control_get_free(parm);
+ default:
+ return -ENOSYS;
}
- mutex_unlock(&xloop_ctl_mutex);
-
- return ret;
}
static const struct file_operations xloop_ctl_fops = {
- .open = nonseekable_open,
- .unlocked_ioctl = xloop_control_ioctl,
- .compat_ioctl = xloop_control_ioctl,
- .owner = THIS_MODULE,
- .llseek = noop_llseek,
+ .open = nonseekable_open,
+ .unlocked_ioctl = xloop_control_ioctl,
+ .compat_ioctl = xloop_control_ioctl,
+ .owner = THIS_MODULE,
+ .llseek = noop_llseek,
};
static struct miscdevice xloop_misc = {
- .minor = XLOOP_CTRL_MINOR,
- .name = "xloop-control",
- .fops = &xloop_ctl_fops,
+ .minor = XLOOP_CTRL_MINOR,
+ .name = "xloop-control",
+ .fops = &xloop_ctl_fops,
};
MODULE_ALIAS_MISCDEV(XLOOP_CTRL_MINOR);
@@ -2089,8 +2298,6 @@ MODULE_ALIAS("devname:xloop-control");
static int __init xloop_init(void)
{
int i, nr;
- unsigned long range;
- struct xloop_device *xlo;
int err;
part_shift = 0;
@@ -2122,20 +2329,21 @@ static int __init xloop_init(void)
* If max_xloop is specified, create that many devices upfront.
* This also becomes a hard limit. If max_xloop is not specified,
* create CONFIG_BLK_DEV_XLOOP_MIN_COUNT xloop devices at module
- * init time. xloop devices can be requested on-demand with the
+ * init time. Loop devices can be requested on-demand with the
* /dev/xloop-control interface, or be instantiated by accessing
* a 'dead' device node.
*/
- if (max_xloop) {
+ if (max_xloop)
+ nr = max_xloop;
+ else
nr = CONFIG_BLK_DEV_XLOOP_MIN_COUNT;
- range = 1UL << MINORBITS;
- }
err = misc_register(&xloop_misc);
if (err < 0)
goto err_out;
- if (register_blkdev(XLOOP_MAJOR, "xloop")) {
+
+ if (__register_blkdev(XLOOP_MAJOR, "xloop", xloop_probe)) {
err = -EIO;
goto misc_out;
}
@@ -2144,57 +2352,50 @@ static int __init xloop_init(void)
xloop_dbgfs_dir = debugfs_create_dir("xloop", NULL);
if (IS_ERR_OR_NULL(xloop_dbgfs_dir)) {
err = -ENODEV;
- goto misc_out;
+ goto blkdev_out;
}
#endif
- blk_register_region(MKDEV(XLOOP_MAJOR, 0), range, THIS_MODULE, xloop_probe, NULL, NULL);
-
/* pre-create number of devices given by config or max_xloop */
- mutex_lock(&xloop_ctl_mutex);
for (i = 0; i < nr; i++)
- xloop_add(&xlo, i);
- mutex_unlock(&xloop_ctl_mutex);
+ xloop_add(i);
pr_info("module in version %s loaded\n", XLOOP_VERSION);
return 0;
+#ifdef CONFIG_DEBUG_FS
+blkdev_out:
+ unregister_blkdev(XLOOP_MAJOR, "xloop");
+#endif
misc_out:
misc_deregister(&xloop_misc);
err_out:
return err;
}
-static int xloop_exit_cb(int id, void *ptr, void *data)
-{
- struct xloop_device *xlo = ptr;
-
- xloop_remove(xlo);
- return 0;
-}
-
static void __exit xloop_exit(void)
{
- unsigned long range;
+ struct xloop_device *xlo;
+ int id;
- range = max_xloop ? max_xloop << part_shift : 1UL << MINORBITS;
+ unregister_blkdev(XLOOP_MAJOR, "xloop");
+ misc_deregister(&xloop_misc);
- mutex_lock(&xloop_ctl_mutex);
+ /*
+ * There is no need to use xloop_ctl_mutex here, for nobody else can
+ * access xloop_index_idr when this module is unloading (unless forced
+ * module unloading is requested). If this is not a clean unloading,
+ * we have no means to avoid kernel crash.
+ */
+ idr_for_each_entry(&xloop_index_idr, xlo, id)
+ xloop_remove(xlo);
- idr_for_each(&xloop_index_idr, &xloop_exit_cb, NULL);
idr_destroy(&xloop_index_idr);
- blk_unregister_region(MKDEV(XLOOP_MAJOR, 0), range);
- unregister_blkdev(XLOOP_MAJOR, "xloop");
-
#ifdef CONFIG_DEBUG_FS
debugfs_remove(xloop_dbgfs_dir);
#endif
- misc_deregister(&xloop_misc);
-
- mutex_unlock(&xloop_ctl_mutex);
-
pr_info("exit module\n");
}
diff --git a/src/kernel/xloop_main.h b/src/kernel/xloop_main.h
index 97c2654..360f3e5 100644
--- a/src/kernel/xloop_main.h
+++ b/src/kernel/xloop_main.h
@@ -1,4 +1,3 @@
-/* SPDX-License-Identifier: GPL-2.0 */
/*
* loop_main.h
*
@@ -15,7 +14,6 @@
#include <linux/blk-mq.h>
#include <linux/spinlock.h>
#include <linux/mutex.h>
-#include <linux/kthread.h>
#include "uapi_xloop.h"
#ifdef CONFIG_DEBUG_FS
#include <linux/debugfs.h>
@@ -28,6 +26,7 @@ enum {
Xlo_unbound,
Xlo_bound,
Xlo_rundown,
+ Xlo_deleting,
};
struct xloop_func_table;
@@ -38,36 +37,41 @@ struct xloop_device {
loff_t xlo_offset;
loff_t xlo_sizelimit;
int xlo_flags;
- int (*transfer)(struct xloop_device *xlo, int cmd, struct page *raw_page,
- unsigned int raw_off, struct page *xloop_page, unsigned int xloop_off,
- int size, sector_t real_block);
+ int (*transfer)(struct xloop_device *xlo, int cmd, struct page *raw_page, unsigned raw_off, struct page *xloop_page, unsigned xloop_off, int size, sector_t real_block);
char xlo_file_name[XLO_NAME_SIZE];
char xlo_crypt_name[XLO_NAME_SIZE];
char xlo_encrypt_key[XLO_KEY_SIZE];
int xlo_encrypt_key_size;
struct xloop_func_table *xlo_encryption;
__u32 xlo_init[2];
- kuid_t xlo_key_owner; /* Who set the key */
- int (*ioctl)(struct xloop_device *xlo, int cmd, unsigned long arg);
+ kuid_t xlo_key_owner; /* Who set the key */
+ int (*ioctl)(struct xloop_device *xlo, int cmd, unsigned long arg);
struct xloop_file_fmt *xlo_fmt;
struct file *xlo_backing_file;
struct block_device *xlo_device;
- void *key_data;
+ void *key_data;
gfp_t old_gfp_mask;
spinlock_t xlo_lock;
int xlo_state;
- struct kthread_worker worker;
- struct task_struct *worker_task;
+ spinlock_t xlo_work_lock;
+ struct workqueue_struct *workqueue;
+ struct work_struct rootcg_work;
+ struct list_head rootcg_cmd_list;
+ struct list_head idle_worker_list;
+ struct rb_root worker_tree;
+ struct timer_list timer;
bool use_dio;
bool sysfs_inited;
struct request_queue *xlo_queue;
struct blk_mq_tag_set tag_set;
struct gendisk *xlo_disk;
+ struct mutex xlo_mutex;
+ bool idr_visible;
#ifdef CONFIG_DEBUG_FS
struct dentry *xlo_dbgfs_dir;
@@ -75,30 +79,30 @@ struct xloop_device {
};
struct xloop_cmd {
- struct kthread_work work;
- bool use_aio; /* use AIO interface to handle I/O */
- atomic_t ref; /* only for aio */
+ struct list_head list_entry;
+ bool use_aio; /* use AIO interface to handle I/O */
+ atomic_t ref; /* only for aio */
long ret;
struct kiocb iocb;
struct bio_vec *bvec;
- struct cgroup_subsys_state *css;
+ struct cgroup_subsys_state *blkcg_css;
+ struct cgroup_subsys_state *memcg_css;
};
/* Support for loadable transfer modules */
struct xloop_func_table {
- int number; /* filter type */
- int (*transfer)(struct xloop_device *xlo, int cmd, struct page *raw_page, unsigned int raw_off,
- struct page *xloop_page, unsigned int xloop_off, int size, sector_t real_block);
- int (*init)(struct xloop_device *xlo, const struct xloop_info64 *info);
+ int number; /* filter type */
+ int (*transfer)(struct xloop_device *xlo, int cmd, struct page *raw_page, unsigned raw_off, struct page *xloop_page, unsigned xloop_off, int size, sector_t real_block);
+ int (*init)(struct xloop_device *xlo, const struct xloop_info64 *);
/* release is called from xloop_unregister_transfer or clr_fd */
- int (*release)(struct xloop_device *xlo);
+ int (*release)(struct xloop_device *xlo);
int (*ioctl)(struct xloop_device *xlo, int cmd, unsigned long arg);
struct module *owner;
-};
+};
extern inline struct device *xloop_device_to_dev(struct xloop_device *xlo);
int xloop_register_transfer(struct xloop_func_table *funcs);
-int xloop_unregister_transfer(int number);
+int xloop_unregister_transfer(int number);
#endif
generated by cgit v1.2.3-55-g7522 (git 2.39.0) at 2024-12-05 02:49:33 +0100