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222 lines
7.2 KiB
222 lines
7.2 KiB
#ifndef UTIL_LINUX_LOOPDEV_H |
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#define UTIL_LINUX_LOOPDEV_H |
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#include "sysfs.h" |
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/* |
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* loop_info.lo_encrypt_type |
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*/ |
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#define LO_CRYPT_NONE 0 |
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#define LO_CRYPT_XOR 1 |
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#define LO_CRYPT_DES 2 |
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#define LO_CRYPT_CRYPTOAPI 18 |
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#define LOOP_SET_FD 0x4C00 |
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#define LOOP_CLR_FD 0x4C01 |
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/* |
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* Obsolete (kernel < 2.6) |
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* |
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* #define LOOP_SET_STATUS 0x4C02 |
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* #define LOOP_GET_STATUS 0x4C03 |
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*/ |
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#define LOOP_SET_STATUS64 0x4C04 |
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#define LOOP_GET_STATUS64 0x4C05 |
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/* #define LOOP_CHANGE_FD 0x4C06 */ |
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#define LOOP_SET_CAPACITY 0x4C07 |
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#define LOOP_SET_DIRECT_IO 0x4C08 |
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#define LOOP_SET_BLOCK_SIZE 0x4C09 |
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/* /dev/loop-control interface */ |
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#ifndef LOOP_CTL_ADD |
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# define LOOP_CTL_ADD 0x4C80 |
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# define LOOP_CTL_REMOVE 0x4C81 |
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# define LOOP_CTL_GET_FREE 0x4C82 |
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#endif |
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/* |
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* loop_info.lo_flags |
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*/ |
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enum { |
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LO_FLAGS_READ_ONLY = 1, |
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LO_FLAGS_USE_AOPS = 2, |
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LO_FLAGS_AUTOCLEAR = 4, /* kernel >= 2.6.25 */ |
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LO_FLAGS_PARTSCAN = 8, /* kernel >= 3.2 */ |
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LO_FLAGS_DIRECT_IO = 16, /* kernel >= 4.2 */ |
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}; |
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#define LO_NAME_SIZE 64 |
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#define LO_KEY_SIZE 32 |
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/* |
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* Linux LOOP_{SET,GET}_STATUS64 ioctl struct |
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*/ |
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struct loop_info64 { |
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uint64_t lo_device; |
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uint64_t lo_inode; |
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uint64_t lo_rdevice; |
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uint64_t lo_offset; |
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uint64_t lo_sizelimit; /* bytes, 0 == max available */ |
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uint32_t lo_number; |
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uint32_t lo_encrypt_type; |
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uint32_t lo_encrypt_key_size; |
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uint32_t lo_flags; |
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uint8_t lo_file_name[LO_NAME_SIZE]; |
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uint8_t lo_crypt_name[LO_NAME_SIZE]; |
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uint8_t lo_encrypt_key[LO_KEY_SIZE]; |
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uint64_t lo_init[2]; |
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}; |
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#ifndef LOOP_CONFIGURE |
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/* |
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* Since Linux v5.8-rc1 (commit 3448914e8cc550ba792d4ccc74471d1ca4293aae) |
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*/ |
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# define LOOP_CONFIGURE 0x4C0A |
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struct loop_config { |
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uint32_t fd; |
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uint32_t block_size; |
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struct loop_info64 info; |
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uint64_t __reserved[8]; |
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}; |
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#endif |
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#define LOOPDEV_MAJOR 7 /* loop major number */ |
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#define LOOPDEV_DEFAULT_NNODES 8 /* default number of loop devices */ |
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struct loopdev_iter { |
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FILE *proc; /* /proc/partitions */ |
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DIR *sysblock; /* /sys/block */ |
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int ncur; /* current position */ |
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int *minors; /* ary of minor numbers (when scan whole /dev) */ |
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int nminors; /* number of items in *minors */ |
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int ct_perm; /* count permission problems */ |
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int ct_succ; /* count number of detected devices */ |
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unsigned int done:1; /* scanning done */ |
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unsigned int default_check:1;/* check first LOOPDEV_NLOOPS */ |
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int flags; /* LOOPITER_FL_* flags */ |
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}; |
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enum { |
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LOOPITER_FL_FREE = (1 << 0), |
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LOOPITER_FL_USED = (1 << 1) |
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}; |
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/* |
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* handler for work with loop devices |
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*/ |
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struct loopdev_cxt { |
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char device[128]; /* device path (e.g. /dev/loop<N>) */ |
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char *filename; /* backing file for loopcxt_set_... */ |
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int fd; /* open(/dev/looo<N>) */ |
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int mode; /* fd mode O_{RDONLY,RDWR} */ |
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uint64_t blocksize; /* used by loopcxt_setup_device() */ |
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int flags; /* LOOPDEV_FL_* flags */ |
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unsigned int has_info:1; /* .info contains data */ |
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unsigned int extra_check:1; /* unusual stuff for iterator */ |
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unsigned int info_failed:1; /* LOOP_GET_STATUS ioctl failed */ |
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unsigned int control_ok:1; /* /dev/loop-control success */ |
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struct path_cxt *sysfs; /* pointer to /sys/dev/block/<maj:min>/ */ |
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struct loop_config config; /* for GET/SET ioctl */ |
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struct loopdev_iter iter; /* scans /sys or /dev for used/free devices */ |
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}; |
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#define UL_LOOPDEVCXT_EMPTY { .fd = -1 } |
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/* |
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* loopdev_cxt.flags |
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*/ |
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enum { |
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LOOPDEV_FL_RDONLY = (1 << 0), /* open(/dev/loop) mode; default */ |
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LOOPDEV_FL_RDWR = (1 << 1), /* necessary for loop setup only */ |
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LOOPDEV_FL_OFFSET = (1 << 4), |
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LOOPDEV_FL_NOSYSFS = (1 << 5), |
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LOOPDEV_FL_NOIOCTL = (1 << 6), |
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LOOPDEV_FL_DEVSUBDIR = (1 << 7), |
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LOOPDEV_FL_CONTROL = (1 << 8), /* system with /dev/loop-control */ |
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LOOPDEV_FL_SIZELIMIT = (1 << 9) |
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}; |
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/* |
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* High-level |
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*/ |
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extern int loopmod_supports_partscan(void); |
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extern int is_loopdev(const char *device); |
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extern int loopdev_is_autoclear(const char *device); |
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extern char *loopdev_get_backing_file(const char *device); |
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extern int loopdev_has_backing_file(const char *device); |
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extern int loopdev_is_used(const char *device, const char *filename, |
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uint64_t offset, uint64_t sizelimit, int flags); |
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extern char *loopdev_find_by_backing_file(const char *filename, |
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uint64_t offset, uint64_t sizelimit, int flags); |
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extern int loopcxt_find_unused(struct loopdev_cxt *lc); |
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extern int loopdev_delete(const char *device); |
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extern int loopdev_count_by_backing_file(const char *filename, char **loopdev); |
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/* |
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* Low-level |
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*/ |
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extern int loopcxt_init(struct loopdev_cxt *lc, int flags) |
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__attribute__ ((warn_unused_result)); |
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extern void loopcxt_deinit(struct loopdev_cxt *lc); |
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extern int loopcxt_set_device(struct loopdev_cxt *lc, const char *device) |
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__attribute__ ((warn_unused_result)); |
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extern int loopcxt_has_device(struct loopdev_cxt *lc); |
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extern int loopcxt_add_device(struct loopdev_cxt *lc); |
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extern char *loopcxt_strdup_device(struct loopdev_cxt *lc); |
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extern const char *loopcxt_get_device(struct loopdev_cxt *lc); |
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extern struct loop_info64 *loopcxt_get_info(struct loopdev_cxt *lc); |
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extern int loopcxt_get_fd(struct loopdev_cxt *lc); |
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extern int loopcxt_set_fd(struct loopdev_cxt *lc, int fd, int mode); |
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extern int loopcxt_init_iterator(struct loopdev_cxt *lc, int flags); |
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extern int loopcxt_deinit_iterator(struct loopdev_cxt *lc); |
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extern int loopcxt_next(struct loopdev_cxt *lc); |
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extern int loopcxt_setup_device(struct loopdev_cxt *lc); |
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extern int loopcxt_delete_device(struct loopdev_cxt *lc); |
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extern int loopcxt_ioctl_status(struct loopdev_cxt *lc); |
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extern int loopcxt_ioctl_capacity(struct loopdev_cxt *lc); |
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extern int loopcxt_ioctl_dio(struct loopdev_cxt *lc, unsigned long use_dio); |
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extern int loopcxt_ioctl_blocksize(struct loopdev_cxt *lc, uint64_t blocksize); |
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int loopcxt_set_offset(struct loopdev_cxt *lc, uint64_t offset); |
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int loopcxt_set_sizelimit(struct loopdev_cxt *lc, uint64_t sizelimit); |
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int loopcxt_set_blocksize(struct loopdev_cxt *lc, uint64_t blocksize); |
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int loopcxt_set_flags(struct loopdev_cxt *lc, uint32_t flags); |
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int loopcxt_set_backing_file(struct loopdev_cxt *lc, const char *filename); |
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extern char *loopcxt_get_backing_file(struct loopdev_cxt *lc); |
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extern int loopcxt_get_backing_devno(struct loopdev_cxt *lc, dev_t *devno); |
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extern int loopcxt_get_backing_inode(struct loopdev_cxt *lc, ino_t *ino); |
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extern int loopcxt_get_offset(struct loopdev_cxt *lc, uint64_t *offset); |
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extern int loopcxt_get_blocksize(struct loopdev_cxt *lc, uint64_t *blocksize); |
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extern int loopcxt_get_sizelimit(struct loopdev_cxt *lc, uint64_t *size); |
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extern int loopcxt_get_encrypt_type(struct loopdev_cxt *lc, uint32_t *type); |
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extern const char *loopcxt_get_crypt_name(struct loopdev_cxt *lc); |
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extern int loopcxt_is_autoclear(struct loopdev_cxt *lc); |
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extern int loopcxt_is_readonly(struct loopdev_cxt *lc); |
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extern int loopcxt_is_dio(struct loopdev_cxt *lc); |
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extern int loopcxt_is_partscan(struct loopdev_cxt *lc); |
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extern int loopcxt_find_by_backing_file(struct loopdev_cxt *lc, |
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const char *filename, |
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uint64_t offset, uint64_t sizelimit, |
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int flags); |
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extern int loopcxt_find_overlap(struct loopdev_cxt *lc, |
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const char *filename, |
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uint64_t offset, uint64_t sizelimit); |
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extern int loopcxt_is_used(struct loopdev_cxt *lc, |
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struct stat *st, |
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const char *backing_file, |
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uint64_t offset, |
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uint64_t sizelimit, |
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int flags); |
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#endif /* UTIL_LINUX_LOOPDEV_H */
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