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102 lines
2.6 KiB
102 lines
2.6 KiB
/* |
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* loop.h |
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* |
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* Written by Theodore Ts'o, 3/29/93. |
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* |
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* Copyright 1993 by Theodore Ts'o. Redistribution of this file is |
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* permitted under the GNU General Public License. |
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*/ |
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#ifndef _LINUX_LOOP_H |
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#define _LINUX_LOOP_H |
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#include <linux/bio.h> |
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#include <linux/blkdev.h> |
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#include <linux/blk-mq.h> |
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#include <linux/spinlock.h> |
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#include <linux/mutex.h> |
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#include <uapi/linux/loop.h> |
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/* Possible states of device */ |
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enum { |
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Lo_unbound, |
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Lo_bound, |
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Lo_rundown, |
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Lo_deleting, |
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}; |
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struct loop_func_table; |
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struct loop_device { |
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int lo_number; |
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atomic_t lo_refcnt; |
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loff_t lo_offset; |
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loff_t lo_sizelimit; |
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int lo_flags; |
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int (*transfer)(struct loop_device *, int cmd, |
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struct page *raw_page, unsigned raw_off, |
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struct page *loop_page, unsigned loop_off, |
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int size, sector_t real_block); |
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char lo_file_name[LO_NAME_SIZE]; |
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char lo_crypt_name[LO_NAME_SIZE]; |
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char lo_encrypt_key[LO_KEY_SIZE]; |
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int lo_encrypt_key_size; |
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struct loop_func_table *lo_encryption; |
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__u32 lo_init[2]; |
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kuid_t lo_key_owner; /* Who set the key */ |
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int (*ioctl)(struct loop_device *, int cmd, |
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unsigned long arg); |
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struct file * lo_backing_file; |
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struct block_device *lo_device; |
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void *key_data; |
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gfp_t old_gfp_mask; |
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spinlock_t lo_lock; |
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int lo_state; |
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spinlock_t lo_work_lock; |
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struct workqueue_struct *workqueue; |
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struct work_struct rootcg_work; |
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struct list_head rootcg_cmd_list; |
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struct list_head idle_worker_list; |
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struct rb_root worker_tree; |
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struct timer_list timer; |
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bool use_dio; |
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bool sysfs_inited; |
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struct request_queue *lo_queue; |
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struct blk_mq_tag_set tag_set; |
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struct gendisk *lo_disk; |
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struct mutex lo_mutex; |
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bool idr_visible; |
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}; |
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struct loop_cmd { |
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struct list_head list_entry; |
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bool use_aio; /* use AIO interface to handle I/O */ |
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atomic_t ref; /* only for aio */ |
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long ret; |
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struct kiocb iocb; |
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struct bio_vec *bvec; |
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struct cgroup_subsys_state *blkcg_css; |
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struct cgroup_subsys_state *memcg_css; |
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}; |
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/* Support for loadable transfer modules */ |
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struct loop_func_table { |
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int number; /* filter type */ |
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int (*transfer)(struct loop_device *lo, int cmd, |
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struct page *raw_page, unsigned raw_off, |
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struct page *loop_page, unsigned loop_off, |
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int size, sector_t real_block); |
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int (*init)(struct loop_device *, const struct loop_info64 *); |
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/* release is called from loop_unregister_transfer or clr_fd */ |
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int (*release)(struct loop_device *); |
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int (*ioctl)(struct loop_device *, int cmd, unsigned long arg); |
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struct module *owner; |
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}; |
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int loop_register_transfer(struct loop_func_table *funcs); |
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int loop_unregister_transfer(int number); |
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#endif
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