thirdparty/util-linux
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lib,loopdev: add missing functions

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- improve loop_info usage (don't call ioctl more than once)
 - add functions to get devno and inode of the backing file
 - add function for compare any file with backing file by devno + inode
   or by filename

Signed-off-by: Karel Zak <kzak@redhat.com>
This commit is contained in:
Karel Zak 2011-12-20 18:25:04 +01:00
parent 7eac65fcf6
commit 6c224de18b
2 changed files with 178 additions and 41 deletions
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12
include/loopdev.h
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@ -96,6 +96,7 @@ struct loopdev_cxt {
unsigned int has_info:1; /* .info contains data */
unsigned int extra_check:1; /* unusual stuff for iterator */
unsigned int debug:1; /* debug mode ON/OFF */
unsigned int info_failed:1; /* LOOP_GET_STATUS ioctl failed */
struct sysfs_cxt sysfs; /* pointer to /sys/dev/block/<maj:min>/ */
struct loop_info64 info; /* for GET/SET ioctl */
@ -120,6 +121,7 @@ enum {
*/
extern int is_loopdev(const char *device);
extern int loopdev_is_autoclear(const char *device);
extern char *loopdev_get_backing_file(const char *device);
extern int loopdev_is_used(const char *device, const char *filename,
uint64_t offset, int flags);
@ -161,12 +163,22 @@ int loopcxt_set_encryption(struct loopdev_cxt *lc,
const char *password);
extern char *loopcxt_get_backing_file(struct loopdev_cxt *lc);
extern int loopcxt_get_backing_devno(struct loopdev_cxt *lc, dev_t *devno);
extern int loopcxt_get_backing_inode(struct loopdev_cxt *lc, ino_t *ino);
extern int loopcxt_get_offset(struct loopdev_cxt *lc, uint64_t *offset);
extern int loopcxt_get_sizelimit(struct loopdev_cxt *lc, uint64_t *size);
extern int loopcxt_get_encrypt_type(struct loopdev_cxt *lc, uint32_t *type);
extern const char *loopcxt_get_crypt_name(struct loopdev_cxt *lc);
extern int loopcxt_is_autoclear(struct loopdev_cxt *lc);
extern int loopcxt_is_readonly(struct loopdev_cxt *lc);
extern int loopcxt_find_by_backing_file(struct loopdev_cxt *lc,
const char *filename,
uint64_t offset, int flags);
extern int loopcxt_is_used(struct loopdev_cxt *lc,
struct stat *st,
const char *backing_file,
uint64_t offset,
int flags);
#endif /* UTIL_LINUX_LOOPDEV_H */