projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 | 1 | /* |
| 83a87611 | 2 | * loop.h |
| 1da177e4 LT |
3 | * |
| 4 | * Written by Theodore Ts'o, 3/29/93. | |
| 5 | * | |
| 6 | * Copyright 1993 by Theodore Ts'o. Redistribution of this file is | |
| 7 | * permitted under the GNU General Public License. | |
| 8 | */ | |
| 607ca46e DH |
9 | #ifndef _LINUX_LOOP_H |
| 10 | #define _LINUX_LOOP_H | |
| 1da177e4 | 11 | |
| 1da177e4 LT |
12 | #include <linux/bio.h> |
| 13 | #include <linux/blkdev.h> | |
| 14 | #include <linux/spinlock.h> | |
| f85221dd | 15 | #include <linux/mutex.h> |
| 607ca46e | 16 | #include <uapi/linux/loop.h> |
| 1da177e4 LT |
17 | |
| 18 | /* Possible states of device */ | |
| 19 | enum { | |
| 20 | Lo_unbound, | |
| 21 | Lo_bound, | |
| 22 | Lo_rundown, | |
| 23 | }; | |
| 24 | ||
| 25 | struct loop_func_table; | |
| 26 | ||
| 27 | struct loop_device { | |
| 28 | int lo_number; | |
| 29 | int lo_refcnt; | |
| 30 | loff_t lo_offset; | |
| 31 | loff_t lo_sizelimit; | |
| 32 | int lo_flags; | |
| 33 | int (*transfer)(struct loop_device *, int cmd, | |
| 34 | struct page *raw_page, unsigned raw_off, | |
| 35 | struct page *loop_page, unsigned loop_off, | |
| 36 | int size, sector_t real_block); | |
| 37 | char lo_file_name[LO_NAME_SIZE]; | |
| 38 | char lo_crypt_name[LO_NAME_SIZE]; | |
| 39 | char lo_encrypt_key[LO_KEY_SIZE]; | |
| 40 | int lo_encrypt_key_size; | |
| 41 | struct loop_func_table *lo_encryption; | |
| 42 | __u32 lo_init[2]; | |
| e4849737 | 43 | kuid_t lo_key_owner; /* Who set the key */ |
| 1da177e4 LT |
44 | int (*ioctl)(struct loop_device *, int cmd, |
| 45 | unsigned long arg); | |
| 46 | ||
| 47 | struct file * lo_backing_file; | |
| 48 | struct block_device *lo_device; | |
| 49 | unsigned lo_blocksize; | |
| 50 | void *key_data; | |
| 51 | ||
| b4e3ca1a | 52 | gfp_t old_gfp_mask; |
| 1da177e4 LT |
53 | |
| 54 | spinlock_t lo_lock; | |
| e686307f | 55 | struct bio_list lo_bio_list; |
| 7b5a3522 | 56 | unsigned int lo_bio_count; |
| 1da177e4 | 57 | int lo_state; |
| f85221dd | 58 | struct mutex lo_ctl_mutex; |
| 6c997918 SH |
59 | struct task_struct *lo_thread; |
| 60 | wait_queue_head_t lo_event; | |
| 7b5a3522 LC |
61 | /* wait queue for incoming requests */ |
| 62 | wait_queue_head_t lo_req_wait; | |
| 1da177e4 | 63 | |
| 01e457cf | 64 | struct request_queue *lo_queue; |
| 73285082 | 65 | struct gendisk *lo_disk; |
| 1da177e4 LT |
66 | }; |
| 67 | ||
| 1da177e4 LT |
68 | /* Support for loadable transfer modules */ |
| 69 | struct loop_func_table { | |
| 70 | int number; /* filter type */ | |
| 71 | int (*transfer)(struct loop_device *lo, int cmd, | |
| 72 | struct page *raw_page, unsigned raw_off, | |
| 73 | struct page *loop_page, unsigned loop_off, | |
| 74 | int size, sector_t real_block); | |
| 75 | int (*init)(struct loop_device *, const struct loop_info64 *); | |
| 76 | /* release is called from loop_unregister_transfer or clr_fd */ | |
| 77 | int (*release)(struct loop_device *); | |
| 78 | int (*ioctl)(struct loop_device *, int cmd, unsigned long arg); | |
| 79 | struct module *owner; | |
| 80 | }; | |
| 81 | ||
| 82 | int loop_register_transfer(struct loop_func_table *funcs); | |
| 83 | int loop_unregister_transfer(int number); | |
| 84 | ||
| 85 | #endif |