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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 422 | giacomo | 1 | #ifndef _LINUX_LOOP_H |
| 2 | #define _LINUX_LOOP_H |
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| 3 | |||
| 4 | /* |
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| 5 | * include/linux/loop.h |
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| 6 | * |
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| 7 | * Written by Theodore Ts'o, 3/29/93. |
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| 8 | * |
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| 9 | * Copyright 1993 by Theodore Ts'o. Redistribution of this file is |
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| 10 | * permitted under the GNU General Public License. |
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| 11 | */ |
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| 12 | |||
| 13 | #define LO_NAME_SIZE 64 |
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| 14 | #define LO_KEY_SIZE 32 |
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| 15 | |||
| 16 | #ifdef __KERNEL__ |
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| 17 | #include <linux/bio.h> |
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| 18 | #include <linux/blkdev.h> |
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| 19 | #include <linux/spinlock.h> |
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| 20 | |||
| 21 | /* Possible states of device */ |
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| 22 | enum { |
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| 23 | Lo_unbound, |
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| 24 | Lo_bound, |
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| 25 | Lo_rundown, |
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| 26 | }; |
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| 27 | |||
| 28 | struct loop_func_table; |
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| 29 | |||
| 30 | struct loop_device { |
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| 31 | int lo_number; |
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| 32 | int lo_refcnt; |
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| 33 | loff_t lo_offset; |
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| 34 | loff_t lo_sizelimit; |
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| 35 | int lo_flags; |
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| 36 | int (*transfer)(struct loop_device *, int cmd, |
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| 37 | char *raw_buf, char *loop_buf, int size, |
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| 38 | sector_t real_block); |
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| 39 | char lo_file_name[LO_NAME_SIZE]; |
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| 40 | char lo_crypt_name[LO_NAME_SIZE]; |
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| 41 | char lo_encrypt_key[LO_KEY_SIZE]; |
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| 42 | int lo_encrypt_key_size; |
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| 43 | struct loop_func_table *lo_encryption; |
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| 44 | __u32 lo_init[2]; |
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| 45 | uid_t lo_key_owner; /* Who set the key */ |
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| 46 | int (*ioctl)(struct loop_device *, int cmd, |
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| 47 | unsigned long arg); |
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| 48 | |||
| 49 | struct file * lo_backing_file; |
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| 50 | struct block_device *lo_device; |
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| 51 | unsigned lo_blocksize; |
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| 52 | void *key_data; |
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| 53 | |||
| 54 | int old_gfp_mask; |
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| 55 | |||
| 56 | spinlock_t lo_lock; |
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| 57 | struct bio *lo_bio; |
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| 58 | struct bio *lo_biotail; |
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| 59 | int lo_state; |
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| 60 | struct semaphore lo_sem; |
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| 61 | struct semaphore lo_ctl_mutex; |
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| 62 | struct semaphore lo_bh_mutex; |
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| 63 | atomic_t lo_pending; |
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| 64 | |||
| 65 | request_queue_t *lo_queue; |
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| 66 | }; |
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| 67 | |||
| 68 | #endif /* __KERNEL__ */ |
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| 69 | |||
| 70 | /* |
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| 71 | * Loop flags |
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| 72 | */ |
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| 73 | #define LO_FLAGS_DO_BMAP 1 |
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| 74 | #define LO_FLAGS_READ_ONLY 2 |
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| 75 | |||
| 76 | #include <asm/posix_types.h> /* for __kernel_old_dev_t */ |
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| 77 | #include <asm/types.h> /* for __u64 */ |
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| 78 | |||
| 79 | /* Backwards compatibility version */ |
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| 80 | struct loop_info { |
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| 81 | int lo_number; /* ioctl r/o */ |
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| 82 | __kernel_old_dev_t lo_device; /* ioctl r/o */ |
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| 83 | unsigned long lo_inode; /* ioctl r/o */ |
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| 84 | __kernel_old_dev_t lo_rdevice; /* ioctl r/o */ |
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| 85 | int lo_offset; |
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| 86 | int lo_encrypt_type; |
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| 87 | int lo_encrypt_key_size; /* ioctl w/o */ |
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| 88 | int lo_flags; /* ioctl r/o */ |
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| 89 | char lo_name[LO_NAME_SIZE]; |
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| 90 | unsigned char lo_encrypt_key[LO_KEY_SIZE]; /* ioctl w/o */ |
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| 91 | unsigned long lo_init[2]; |
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| 92 | char reserved[4]; |
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| 93 | }; |
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| 94 | |||
| 95 | struct loop_info64 { |
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| 96 | __u64 lo_device; /* ioctl r/o */ |
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| 97 | __u64 lo_inode; /* ioctl r/o */ |
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| 98 | __u64 lo_rdevice; /* ioctl r/o */ |
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| 99 | __u64 lo_offset; |
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| 100 | __u64 lo_sizelimit;/* bytes, 0 == max available */ |
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| 101 | __u32 lo_number; /* ioctl r/o */ |
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| 102 | __u32 lo_encrypt_type; |
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| 103 | __u32 lo_encrypt_key_size; /* ioctl w/o */ |
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| 104 | __u32 lo_flags; /* ioctl r/o */ |
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| 105 | __u8 lo_file_name[LO_NAME_SIZE]; |
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| 106 | __u8 lo_crypt_name[LO_NAME_SIZE]; |
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| 107 | __u8 lo_encrypt_key[LO_KEY_SIZE]; /* ioctl w/o */ |
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| 108 | __u64 lo_init[2]; |
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| 109 | }; |
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| 110 | |||
| 111 | /* |
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| 112 | * Loop filter types |
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| 113 | */ |
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| 114 | |||
| 115 | #define LO_CRYPT_NONE 0 |
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| 116 | #define LO_CRYPT_XOR 1 |
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| 117 | #define LO_CRYPT_DES 2 |
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| 118 | #define LO_CRYPT_FISH2 3 /* Twofish encryption */ |
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| 119 | #define LO_CRYPT_BLOW 4 |
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| 120 | #define LO_CRYPT_CAST128 5 |
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| 121 | #define LO_CRYPT_IDEA 6 |
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| 122 | #define LO_CRYPT_DUMMY 9 |
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| 123 | #define LO_CRYPT_SKIPJACK 10 |
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| 124 | #define LO_CRYPT_CRYPTOAPI 18 |
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| 125 | #define MAX_LO_CRYPT 20 |
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| 126 | |||
| 127 | #ifdef __KERNEL__ |
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| 128 | /* Support for loadable transfer modules */ |
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| 129 | struct loop_func_table { |
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| 130 | int number; /* filter type */ |
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| 131 | int (*transfer)(struct loop_device *lo, int cmd, char *raw_buf, |
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| 132 | char *loop_buf, int size, sector_t real_block); |
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| 133 | int (*init)(struct loop_device *, const struct loop_info64 *); |
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| 134 | /* release is called from loop_unregister_transfer or clr_fd */ |
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| 135 | int (*release)(struct loop_device *); |
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| 136 | int (*ioctl)(struct loop_device *, int cmd, unsigned long arg); |
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| 137 | struct module *owner; |
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| 138 | }; |
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| 139 | |||
| 140 | int loop_register_transfer(struct loop_func_table *funcs); |
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| 141 | int loop_unregister_transfer(int number); |
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| 142 | |||
| 143 | #endif |
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| 144 | /* |
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| 145 | * IOCTL commands --- we will commandeer 0x4C ('L') |
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| 146 | */ |
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| 147 | |||
| 148 | #define LOOP_SET_FD 0x4C00 |
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| 149 | #define LOOP_CLR_FD 0x4C01 |
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| 150 | #define LOOP_SET_STATUS 0x4C02 |
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| 151 | #define LOOP_GET_STATUS 0x4C03 |
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| 152 | #define LOOP_SET_STATUS64 0x4C04 |
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| 153 | #define LOOP_GET_STATUS64 0x4C05 |
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| 154 | |||
| 155 | #endif |