diff options
Diffstat (limited to 'include/linux/loop.h')
| -rw-r--r-- | include/linux/loop.h | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/include/linux/loop.h b/include/linux/loop.h new file mode 100644 index 00000000..11a41a8f --- /dev/null +++ b/include/linux/loop.h @@ -0,0 +1,167 @@ +#ifndef _LINUX_LOOP_H +#define _LINUX_LOOP_H + +/* + * include/linux/loop.h + * + * Written by Theodore Ts'o, 3/29/93. + * + * Copyright 1993 by Theodore Ts'o. Redistribution of this file is + * permitted under the GNU General Public License. + */ + +#define LO_NAME_SIZE 64 +#define LO_KEY_SIZE 32 + +#ifdef __KERNEL__ +#include <linux/bio.h> +#include <linux/blkdev.h> +#include <linux/spinlock.h> +#include <linux/mutex.h> + +/* Possible states of device */ +enum { + Lo_unbound, + Lo_bound, + Lo_rundown, +}; + +struct loop_func_table; + +struct loop_device { + int lo_number; + int lo_refcnt; + loff_t lo_offset; + loff_t lo_sizelimit; + int lo_flags; + int (*transfer)(struct loop_device *, int cmd, + struct page *raw_page, unsigned raw_off, + struct page *loop_page, unsigned loop_off, + int size, sector_t real_block); + char lo_file_name[LO_NAME_SIZE]; + char lo_crypt_name[LO_NAME_SIZE]; + char lo_encrypt_key[LO_KEY_SIZE]; + int lo_encrypt_key_size; + struct loop_func_table *lo_encryption; + __u32 lo_init[2]; + uid_t lo_key_owner; /* Who set the key */ + int (*ioctl)(struct loop_device *, int cmd, + unsigned long arg); + + struct file * lo_backing_file; + struct block_device *lo_device; + unsigned lo_blocksize; + void *key_data; + + gfp_t old_gfp_mask; + + spinlock_t lo_lock; + struct bio_list lo_bio_list; + int lo_state; + struct mutex lo_ctl_mutex; + struct task_struct *lo_thread; + wait_queue_head_t lo_event; + + struct request_queue *lo_queue; + struct gendisk *lo_disk; +}; + +#endif /* __KERNEL__ */ + +/* + * Loop flags + */ +enum { + LO_FLAGS_READ_ONLY = 1, + LO_FLAGS_AUTOCLEAR = 4, + LO_FLAGS_PARTSCAN = 8, +}; + +#include <asm/posix_types.h> /* for __kernel_old_dev_t */ +#include <linux/types.h> /* for __u64 */ + +/* Backwards compatibility version */ +struct loop_info { + int lo_number; /* ioctl r/o */ + __kernel_old_dev_t lo_device; /* ioctl r/o */ + unsigned long lo_inode; /* ioctl r/o */ + __kernel_old_dev_t lo_rdevice; /* ioctl r/o */ + int lo_offset; + int lo_encrypt_type; + int lo_encrypt_key_size; /* ioctl w/o */ + int lo_flags; /* ioctl r/o */ + char lo_name[LO_NAME_SIZE]; + unsigned char lo_encrypt_key[LO_KEY_SIZE]; /* ioctl w/o */ + unsigned long lo_init[2]; + char reserved[4]; +}; + +struct loop_info64 { + __u64 lo_device; /* ioctl r/o */ + __u64 lo_inode; /* ioctl r/o */ + __u64 lo_rdevice; /* ioctl r/o */ + __u64 lo_offset; + __u64 lo_sizelimit;/* bytes, 0 == max available */ + __u32 lo_number; /* ioctl r/o */ + __u32 lo_encrypt_type; + __u32 lo_encrypt_key_size; /* ioctl w/o */ + __u32 lo_flags; /* ioctl r/o */ + __u8 lo_file_name[LO_NAME_SIZE]; + __u8 lo_crypt_name[LO_NAME_SIZE]; + __u8 lo_encrypt_key[LO_KEY_SIZE]; /* ioctl w/o */ + __u64 lo_init[2]; +}; + +/* + * Loop filter types + */ + +#define LO_CRYPT_NONE 0 +#define LO_CRYPT_XOR 1 +#define LO_CRYPT_DES 2 +#define LO_CRYPT_FISH2 3 /* Twofish encryption */ +#define LO_CRYPT_BLOW 4 +#define LO_CRYPT_CAST128 5 +#define LO_CRYPT_IDEA 6 +#define LO_CRYPT_DUMMY 9 +#define LO_CRYPT_SKIPJACK 10 +#define LO_CRYPT_CRYPTOAPI 18 +#define MAX_LO_CRYPT 20 + +#ifdef __KERNEL__ +/* Support for loadable transfer modules */ +struct loop_func_table { + int number; /* filter type */ + int (*transfer)(struct loop_device *lo, int cmd, + struct page *raw_page, unsigned raw_off, + struct page *loop_page, unsigned loop_off, + int size, sector_t real_block); + int (*init)(struct loop_device *, const struct loop_info64 *); + /* release is called from loop_unregister_transfer or clr_fd */ + int (*release)(struct loop_device *); + int (*ioctl)(struct loop_device *, int cmd, unsigned long arg); + struct module *owner; +}; + +int loop_register_transfer(struct loop_func_table *funcs); +int loop_unregister_transfer(int number); + +#endif +/* + * IOCTL commands --- we will commandeer 0x4C ('L') + */ + +#define LOOP_SET_FD 0x4C00 +#define LOOP_CLR_FD 0x4C01 +#define LOOP_SET_STATUS 0x4C02 +#define LOOP_GET_STATUS 0x4C03 +#define LOOP_SET_STATUS64 0x4C04 +#define LOOP_GET_STATUS64 0x4C05 +#define LOOP_CHANGE_FD 0x4C06 +#define LOOP_SET_CAPACITY 0x4C07 + +/* /dev/loop-control interface */ +#define LOOP_CTL_ADD 0x4C80 +#define LOOP_CTL_REMOVE 0x4C81 +#define LOOP_CTL_GET_FREE 0x4C82 +#endif |