diff options
Diffstat (limited to 'include/linux/loop.h')
| -rw-r--r-- | include/linux/loop.h | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/include/linux/loop.h b/include/linux/loop.h new file mode 100644 index 0000000000..8220d9c9da --- /dev/null +++ b/include/linux/loop.h | |||
| @@ -0,0 +1,161 @@ | |||
| 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> | ||
| 20 | |||
| 21 | /* Possible states of device */ | ||
| 22 | enum { | ||
| 23 | Lo_unbound, | ||
| 24 | Lo_bound, | ||
| 25 | Lo_rundown, | ||
| 26 | }; | ||
| 27 | |||
| 28 | struct loop_func_table; | ||
| 29 | |||
| 30 | struct loop_device { | ||
| 31 | int lo_number; | ||
| 32 | int lo_refcnt; | ||
| 33 | loff_t lo_offset; | ||
| 34 | loff_t lo_sizelimit; | ||
| 35 | int lo_flags; | ||
| 36 | int (*transfer)(struct loop_device *, int cmd, | ||
| 37 | struct page *raw_page, unsigned raw_off, | ||
| 38 | struct page *loop_page, unsigned loop_off, | ||
| 39 | int size, sector_t real_block); | ||
| 40 | char lo_file_name[LO_NAME_SIZE]; | ||
| 41 | char lo_crypt_name[LO_NAME_SIZE]; | ||
| 42 | char lo_encrypt_key[LO_KEY_SIZE]; | ||
| 43 | int lo_encrypt_key_size; | ||
| 44 | struct loop_func_table *lo_encryption; | ||
| 45 | __u32 lo_init[2]; | ||
| 46 | uid_t lo_key_owner; /* Who set the key */ | ||
| 47 | int (*ioctl)(struct loop_device *, int cmd, | ||
| 48 | unsigned long arg); | ||
| 49 | |||
| 50 | struct file * lo_backing_file; | ||
| 51 | struct block_device *lo_device; | ||
| 52 | unsigned lo_blocksize; | ||
| 53 | void *key_data; | ||
| 54 | |||
| 55 | int old_gfp_mask; | ||
| 56 | |||
| 57 | spinlock_t lo_lock; | ||
| 58 | struct bio *lo_bio; | ||
| 59 | struct bio *lo_biotail; | ||
| 60 | int lo_state; | ||
| 61 | struct semaphore lo_sem; | ||
| 62 | struct semaphore lo_ctl_mutex; | ||
| 63 | struct semaphore lo_bh_mutex; | ||
| 64 | atomic_t lo_pending; | ||
| 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 | ||