diff options
Diffstat (limited to 'kernel/loop_main.h')
-rw-r--r-- | kernel/loop_main.h | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/kernel/loop_main.h b/kernel/loop_main.h new file mode 100644 index 0000000..1b5851a --- /dev/null +++ b/kernel/loop_main.h @@ -0,0 +1,105 @@ +/* + * loop_main.h + * + * Written by Theodore Ts'o, 3/29/93. + * + * Copyright 1993 by Theodore Ts'o. Redistribution of this file is + * permitted under the GNU General Public License. + */ +#ifndef _LINUX_XLOOP_H +#define _LINUX_XLOOP_H + +#include <linux/bio.h> +#include <linux/blkdev.h> +#include <linux/blk-mq.h> +#include <linux/spinlock.h> +#include <linux/mutex.h> +#include <linux/kthread.h> +#include "uapi/linux/loop.h" +#ifdef CONFIG_DEBUG_FS +#include <linux/debugfs.h> +#endif + +#include "loop_file_fmt.h" + +/* Possible states of device */ +enum { + Xlo_unbound, + Xlo_bound, + Xlo_rundown, +}; + +struct xloop_func_table; + +struct xloop_device { + int xlo_number; + atomic_t xlo_refcnt; + loff_t xlo_offset; + loff_t xlo_sizelimit; + int xlo_flags; + int (*transfer)(struct xloop_device *, 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 *, int cmd, + unsigned long arg); + + struct xloop_file_fmt *xlo_fmt; + + struct file * xlo_backing_file; + struct block_device *xlo_device; + void *key_data; + + gfp_t old_gfp_mask; + + spinlock_t xlo_lock; + int xlo_state; + struct kthread_worker worker; + struct task_struct *worker_task; + bool use_dio; + bool sysfs_inited; + + struct request_queue *xlo_queue; + struct blk_mq_tag_set tag_set; + struct gendisk *xlo_disk; + +#ifdef CONFIG_DEBUG_FS + struct dentry *xlo_dbgfs_dir; +#endif +}; + +struct xloop_cmd { + struct kthread_work work; + 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; +}; + +/* 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 raw_off, + struct page *xloop_page, unsigned xloop_off, + int size, sector_t real_block); + int (*init)(struct xloop_device *, const struct xloop_info64 *); + /* release is called from xloop_unregister_transfer or clr_fd */ + int (*release)(struct xloop_device *); + int (*ioctl)(struct xloop_device *, int cmd, unsigned long arg); + struct module *owner; +}; + +int xloop_register_transfer(struct xloop_func_table *funcs); +int xloop_unregister_transfer(int number); + +#endif |