#ifndef UTIL_LINUX_LOOPDEV_H
#define UTIL_LINUX_LOOPDEV_H
+#include "sysfs.h"
+
/*
* loop_info.lo_encrypt_type
*/
#define LOOP_GET_STATUS64 0x4C05
/* #define LOOP_CHANGE_FD 0x4C06 */
#define LOOP_SET_CAPACITY 0x4C07
+#define LOOP_SET_DIRECT_IO 0x4C08
+#define LOOP_SET_BLOCK_SIZE 0x4C09
+
+/* /dev/loop-control interface */
+#ifndef LOOP_CTL_ADD
+# define LOOP_CTL_ADD 0x4C80
+# define LOOP_CTL_REMOVE 0x4C81
+# define LOOP_CTL_GET_FREE 0x4C82
+#endif
/*
* loop_info.lo_flags
enum {
LO_FLAGS_READ_ONLY = 1,
LO_FLAGS_USE_AOPS = 2,
- LO_FLAGS_AUTOCLEAR = 4, /* New in 2.6.25 */
+ LO_FLAGS_AUTOCLEAR = 4, /* kernel >= 2.6.25 */
+ LO_FLAGS_PARTSCAN = 8, /* kernel >= 3.2 */
+ LO_FLAGS_DIRECT_IO = 16, /* kernel >= 4.2 */
};
#define LO_NAME_SIZE 64
#define LO_KEY_SIZE 32
/*
- * Linux LOOP_{SET,GET}_STATUS64 ioclt struct
+ * Linux LOOP_{SET,GET}_STATUS64 ioctl struct
*/
struct loop_info64 {
uint64_t lo_device;
struct loopdev_iter {
FILE *proc; /* /proc/partitions */
+ DIR *sysblock; /* /sys/block */
int ncur; /* current position */
int *minors; /* ary of minor numbers (when scan whole /dev) */
int nminors; /* number of items in *minors */
int ct_perm; /* count permission problems */
int ct_succ; /* count number of detected devices */
- int done:1; /* scanning done */
- int default_check:1;/* check first LOOPDEV_NLOOPS */
+ unsigned int done:1; /* scanning done */
+ unsigned int default_check:1;/* check first LOOPDEV_NLOOPS */
int flags; /* LOOPITER_FL_* flags */
};
char device[128]; /* device path (e.g. /dev/loop<N>) */
char *filename; /* backing file for loopcxt_set_... */
int fd; /* open(/dev/looo<N>) */
+ int mode; /* fd mode O_{RDONLY,RDWR} */
+ uint64_t blocksize; /* used by loopcxt_setup_device() */
int flags; /* LOOPDEV_FL_* flags */
- int has_info:1; /* .info contains data */
- int extra_check:1; /* unusual stuff for iterator */
+ unsigned int has_info:1; /* .info contains data */
+ unsigned int extra_check:1; /* unusual stuff for iterator */
+ unsigned int info_failed:1; /* LOOP_GET_STATUS ioctl failed */
+ unsigned int control_ok:1; /* /dev/loop-control success */
- struct sysfs_cxt sysfs; /* pointer to /sys/dev/block/<maj:min>/ */
+ struct path_cxt *sysfs; /* pointer to /sys/dev/block/<maj:min>/ */
struct loop_info64 info; /* for GET/SET ioctl */
struct loopdev_iter iter; /* scans /sys or /dev for used/free devices */
};
+#define UL_LOOPDEVCXT_EMPTY { .fd = -1 }
+
/*
* loopdev_cxt.flags
*/
enum {
- LOOPDEV_FL_RDONLY = (1 << 0), /* default */
+ LOOPDEV_FL_RDONLY = (1 << 0), /* open(/dev/loop) mode; default */
LOOPDEV_FL_RDWR = (1 << 1), /* necessary for loop setup only */
LOOPDEV_FL_OFFSET = (1 << 4),
LOOPDEV_FL_NOSYSFS = (1 << 5),
LOOPDEV_FL_NOIOCTL = (1 << 6),
- LOOPDEV_FL_DEVSUBDIR = (1 << 7)
+ LOOPDEV_FL_DEVSUBDIR = (1 << 7),
+ LOOPDEV_FL_CONTROL = (1 << 8), /* system with /dev/loop-control */
+ LOOPDEV_FL_SIZELIMIT = (1 << 9)
};
/*
* High-level
*/
+extern int loopmod_supports_partscan(void);
+
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);
+ uint64_t offset, uint64_t sizelimit, int flags);
extern char *loopdev_find_by_backing_file(const char *filename,
- uint64_t offset, int flags);
+ uint64_t offset, uint64_t sizelimit, int flags);
extern int loopcxt_find_unused(struct loopdev_cxt *lc);
extern int loopdev_delete(const char *device);
+extern int loopdev_count_by_backing_file(const char *filename, char **loopdev);
/*
* Low-level
*/
-extern int loopcxt_init(struct loopdev_cxt *lc, int flags);
+extern int loopcxt_init(struct loopdev_cxt *lc, int flags)
+ __attribute__ ((warn_unused_result));
extern void loopcxt_deinit(struct loopdev_cxt *lc);
-extern int loopcxt_set_device(struct loopdev_cxt *lc, const char *device);
+extern int loopcxt_set_device(struct loopdev_cxt *lc, const char *device)
+ __attribute__ ((warn_unused_result));
+extern int loopcxt_has_device(struct loopdev_cxt *lc);
+extern int loopcxt_add_device(struct loopdev_cxt *lc);
extern char *loopcxt_strdup_device(struct loopdev_cxt *lc);
extern const char *loopcxt_get_device(struct loopdev_cxt *lc);
-extern struct sysfs_cxt *loopcxt_get_sysfs(struct loopdev_cxt *lc);
+extern struct loop_info64 *loopcxt_get_info(struct loopdev_cxt *lc);
+
extern int loopcxt_get_fd(struct loopdev_cxt *lc);
+extern int loopcxt_set_fd(struct loopdev_cxt *lc, int fd, int mode);
extern int loopcxt_init_iterator(struct loopdev_cxt *lc, int flags);
extern int loopcxt_deinit_iterator(struct loopdev_cxt *lc);
extern int loopcxt_setup_device(struct loopdev_cxt *lc);
extern int loopcxt_delete_device(struct loopdev_cxt *lc);
+extern int loopcxt_ioctl_status(struct loopdev_cxt *lc);
+extern int loopcxt_ioctl_capacity(struct loopdev_cxt *lc);
+extern int loopcxt_ioctl_dio(struct loopdev_cxt *lc, unsigned long use_dio);
+extern int loopcxt_ioctl_blocksize(struct loopdev_cxt *lc, uint64_t blocksize);
+
int loopcxt_set_offset(struct loopdev_cxt *lc, uint64_t offset);
int loopcxt_set_sizelimit(struct loopdev_cxt *lc, uint64_t sizelimit);
+int loopcxt_set_blocksize(struct loopdev_cxt *lc, uint64_t blocksize);
int loopcxt_set_flags(struct loopdev_cxt *lc, uint32_t flags);
int loopcxt_set_backing_file(struct loopdev_cxt *lc, const char *filename);
-int loopcxt_set_encryption(struct loopdev_cxt *lc,
- const char *encryption,
- 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_blocksize(struct loopdev_cxt *lc, uint64_t *blocksize);
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_is_dio(struct loopdev_cxt *lc);
+extern int loopcxt_is_partscan(struct loopdev_cxt *lc);
extern int loopcxt_find_by_backing_file(struct loopdev_cxt *lc,
const char *filename,
- uint64_t offset, int flags);
+ uint64_t offset, uint64_t sizelimit,
+ int flags);
+extern int loopcxt_find_overlap(struct loopdev_cxt *lc,
+ const char *filename,
+ uint64_t offset, uint64_t sizelimit);
+
+extern int loopcxt_is_used(struct loopdev_cxt *lc,
+ struct stat *st,
+ const char *backing_file,
+ uint64_t offset,
+ uint64_t sizelimit,
+ int flags);
#endif /* UTIL_LINUX_LOOPDEV_H */
projects / thirdparty / util-linux.git / blobdiff