projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | #ifndef _LINUX_LOOP_H |
| 2 | #define _LINUX_LOOP_H | |
| 3 | ||
| 4 | /* | |
| 5 | * include/linux/loop.h | |
| 6 | * | |
| 7 | * Written by Theodore Ts'o, 3/29/93. | |
| 8 | * | |
| 9 | * Copyright 1993 by Theodore Ts'o. Redistribution of this file is | |
| 10 | * permitted under the GNU General Public License. | |
| 11 | */ | |
| 12 | ||
| 13 | #define LO_NAME_SIZE 64 | |
| 14 | #define LO_KEY_SIZE 32 | |
| 15 | ||
| 16 | #ifdef __KERNEL__ | |
| 17 | #include <linux/bio.h> | |
| 18 | #include <linux/blkdev.h> | |
| 19 | #include <linux/spinlock.h> | |
| f85221dd | 20 | #include <linux/mutex.h> |
| 1da177e4 LT |
21 | |
| 22 | /* Possible states of device */ | |
| 23 | enum { | |
| 24 | Lo_unbound, | |
| 25 | Lo_bound, | |
| 26 | Lo_rundown, | |
| 27 | }; | |
| 28 | ||
| 29 | struct loop_func_table; | |
| 30 | ||
| 31 | struct loop_device { | |
| 32 | int lo_number; | |
| 33 | int lo_refcnt; | |
| 34 | loff_t lo_offset; | |
| 35 | loff_t lo_sizelimit; | |
| 36 | int lo_flags; | |
| 37 | int (*transfer)(struct loop_device *, int cmd, | |
| 38 | struct page *raw_page, unsigned raw_off, | |
| 39 | struct page *loop_page, unsigned loop_off, | |
| 40 | int size, sector_t real_block); | |
| 41 | char lo_file_name[LO_NAME_SIZE]; | |
| 42 | char lo_crypt_name[LO_NAME_SIZE]; | |
| 43 | char lo_encrypt_key[LO_KEY_SIZE]; | |
| 44 | int lo_encrypt_key_size; | |
| 45 | struct loop_func_table *lo_encryption; | |
| 46 | __u32 lo_init[2]; | |
| 47 | uid_t lo_key_owner; /* Who set the key */ | |
| 48 | int (*ioctl)(struct loop_device *, int cmd, | |
| 49 | unsigned long arg); | |
| 50 | ||
| 51 | struct file * lo_backing_file; | |
| 52 | struct block_device *lo_device; | |
| 53 | unsigned lo_blocksize; | |
| 54 | void *key_data; | |
| 55 | ||
| b4e3ca1a | 56 | gfp_t old_gfp_mask; |
| 1da177e4 LT |
57 | |
| 58 | spinlock_t lo_lock; | |
| 59 | struct bio *lo_bio; | |
| 60 | struct bio *lo_biotail; | |
| 61 | int lo_state; | |
| f85221dd | 62 | struct mutex lo_ctl_mutex; |
| 6c997918 SH |
63 | struct task_struct *lo_thread; |
| 64 | wait_queue_head_t lo_event; | |
| 1da177e4 LT |
65 | |
| 66 | request_queue_t *lo_queue; | |
| 67 | }; | |
| 68 | ||
| 69 | #endif /* __KERNEL__ */ | |
| 70 | ||
| 71 | /* | |
| 72 | * Loop flags | |
| 73 | */ | |
| 74 | enum { | |
| 75 | LO_FLAGS_READ_ONLY = 1, | |
| 76 | LO_FLAGS_USE_AOPS = 2, | |
| 77 | }; | |
| 78 | ||
| 79 | #include <asm/posix_types.h> /* for __kernel_old_dev_t */ | |
| 80 | #include <asm/types.h> /* for __u64 */ | |
| 81 | ||
| 82 | /* Backwards compatibility version */ | |
| 83 | struct loop_info { | |
| 84 | int lo_number; /* ioctl r/o */ | |
| 85 | __kernel_old_dev_t lo_device; /* ioctl r/o */ | |
| 86 | unsigned long lo_inode; /* ioctl r/o */ | |
| 87 | __kernel_old_dev_t lo_rdevice; /* ioctl r/o */ | |
| 88 | int lo_offset; | |
| 89 | int lo_encrypt_type; | |
| 90 | int lo_encrypt_key_size; /* ioctl w/o */ | |
| 91 | int lo_flags; /* ioctl r/o */ | |
| 92 | char lo_name[LO_NAME_SIZE]; | |
| 93 | unsigned char lo_encrypt_key[LO_KEY_SIZE]; /* ioctl w/o */ | |
| 94 | unsigned long lo_init[2]; | |
| 95 | char reserved[4]; | |
| 96 | }; | |
| 97 | ||
| 98 | struct loop_info64 { | |
| 99 | __u64 lo_device; /* ioctl r/o */ | |
| 100 | __u64 lo_inode; /* ioctl r/o */ | |
| 101 | __u64 lo_rdevice; /* ioctl r/o */ | |
| 102 | __u64 lo_offset; | |
| 103 | __u64 lo_sizelimit;/* bytes, 0 == max available */ | |
| 104 | __u32 lo_number; /* ioctl r/o */ | |
| 105 | __u32 lo_encrypt_type; | |
| 106 | __u32 lo_encrypt_key_size; /* ioctl w/o */ | |
| 107 | __u32 lo_flags; /* ioctl r/o */ | |
| 108 | __u8 lo_file_name[LO_NAME_SIZE]; | |
| 109 | __u8 lo_crypt_name[LO_NAME_SIZE]; | |
| 110 | __u8 lo_encrypt_key[LO_KEY_SIZE]; /* ioctl w/o */ | |
| 111 | __u64 lo_init[2]; | |
| 112 | }; | |
| 113 | ||
| 114 | /* | |
| 115 | * Loop filter types | |
| 116 | */ | |
| 117 | ||
| 118 | #define LO_CRYPT_NONE 0 | |
| 119 | #define LO_CRYPT_XOR 1 | |
| 120 | #define LO_CRYPT_DES 2 | |
| 121 | #define LO_CRYPT_FISH2 3 /* Twofish encryption */ | |
| 122 | #define LO_CRYPT_BLOW 4 | |
| 123 | #define LO_CRYPT_CAST128 5 | |
| 124 | #define LO_CRYPT_IDEA 6 | |
| 125 | #define LO_CRYPT_DUMMY 9 | |
| 126 | #define LO_CRYPT_SKIPJACK 10 | |
| 127 | #define LO_CRYPT_CRYPTOAPI 18 | |
| 128 | #define MAX_LO_CRYPT 20 | |
| 129 | ||
| 130 | #ifdef __KERNEL__ | |
| 131 | /* Support for loadable transfer modules */ | |
| 132 | struct loop_func_table { | |
| 133 | int number; /* filter type */ | |
| 134 | int (*transfer)(struct loop_device *lo, int cmd, | |
| 135 | struct page *raw_page, unsigned raw_off, | |
| 136 | struct page *loop_page, unsigned loop_off, | |
| 137 | int size, sector_t real_block); | |
| 138 | int (*init)(struct loop_device *, const struct loop_info64 *); | |
| 139 | /* release is called from loop_unregister_transfer or clr_fd */ | |
| 140 | int (*release)(struct loop_device *); | |
| 141 | int (*ioctl)(struct loop_device *, int cmd, unsigned long arg); | |
| 142 | struct module *owner; | |
| 143 | }; | |
| 144 | ||
| 145 | int loop_register_transfer(struct loop_func_table *funcs); | |
| 146 | int loop_unregister_transfer(int number); | |
| 147 | ||
| 148 | #endif | |
| 149 | /* | |
| 150 | * IOCTL commands --- we will commandeer 0x4C ('L') | |
| 151 | */ | |
| 152 | ||
| 153 | #define LOOP_SET_FD 0x4C00 | |
| 154 | #define LOOP_CLR_FD 0x4C01 | |
| 155 | #define LOOP_SET_STATUS 0x4C02 | |
| 156 | #define LOOP_GET_STATUS 0x4C03 | |
| 157 | #define LOOP_SET_STATUS64 0x4C04 | |
| 158 | #define LOOP_GET_STATUS64 0x4C05 | |
| 159 | #define LOOP_CHANGE_FD 0x4C06 | |
| 160 | ||
| 161 | #endif |