lib: [loopdev.c] add module for work loop devices
Signed-off-by: Karel Zak <kzak@redhat.com>
This commit is contained in:
Karel Zak
parent
87e77645f5
commit
10ee593293
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@ -15,6 +15,7 @@ dist_noinst_HEADERS = \
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linux_reboot.h \
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linux_version.h \
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list.h \
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loopdev.h \
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mangle.h \
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mbsalign.h \
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md5.h \
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@ -0,0 +1,154 @@
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#ifndef UTIL_LINUX_LOOPDEV_H
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#define UTIL_LINUX_LOOPDEV_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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/*
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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, /* New in 2.6.25 */
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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 ioclt 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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#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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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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int done:1; /* scanning done */
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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 flags; /* LOOPDEV_FL_* flags */
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int has_info:1; /* .info contains data */
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int extra_check:1; /* unusual stuff for iterator */
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struct sysfs_cxt sysfs; /* pointer to /sys/dev/block/<maj:min>/ */
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struct loop_info64 info; /* 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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/*
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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), /* 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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};
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/*
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* High-level
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*/
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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_is_used(const char *device, const char *filename,
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uint64_t offset, int flags);
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extern char *loopdev_find_by_backing_file(const char *filename,
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uint64_t offset, 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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/*
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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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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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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 sysfs_cxt *loopcxt_get_sysfs(struct loopdev_cxt *lc);
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extern int loopcxt_get_fd(struct loopdev_cxt *lc);
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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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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_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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int loopcxt_set_encryption(struct loopdev_cxt *lc,
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const char *encryption,
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const char *password);
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extern char *loopcxt_get_backing_file(struct loopdev_cxt *lc);
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extern int loopcxt_get_offset(struct loopdev_cxt *lc, uint64_t *offset);
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extern int loopcxt_get_sizelimit(struct loopdev_cxt *lc, uint64_t *size);
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extern int loopcxt_is_autoclear(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, int flags);
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#endif /* UTIL_LINUX_LOOPDEV_H */
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@ -111,6 +111,9 @@
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#define _PATH_MOUNTED_TMP _PATH_MOUNTED ".tmp"
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#ifndef _PATH_DEV
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/*
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* The tailing '/' in _PATH_DEV is there for compatibility with libc.
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*/
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# define _PATH_DEV "/dev/"
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#endif
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@ -3,12 +3,13 @@ include $(top_srcdir)/config/include-Makefile.am
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AM_CPPFLAGS += -DTEST_PROGRAM
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noinst_PROGRAMS = test_blkdev test_ismounted test_wholedisk test_mangle \
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test_tt test_canonicalize test_strutils test_procutils
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test_tt test_canonicalize test_strutils test_procutils \
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test_at
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if LINUX
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if HAVE_CPU_SET_T
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noinst_PROGRAMS += test_cpuset
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endif
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noinst_PROGRAMS += test_sysfs
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noinst_PROGRAMS += test_sysfs test_loopdev
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endif
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test_blkdev_SOURCES = blkdev.c
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@ -26,10 +27,19 @@ if LINUX
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test_cpuset_SOURCES = cpuset.c
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test_sysfs_SOURCES = sysfs.c at.c
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test_sysfs_CFLAGS = -DTEST_PROGRAM_SYSFS
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test_loopdev_SOURCES = loopdev.c \
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$(test_sysfs_SOURCES) \
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$(top_srcdir)/lib/linux_version.c \
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$(top_srcdir)/lib/canonicalize.c
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test_loopdev_CFLAGS = -DTEST_PROGRAM_LOOPDEV
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endif
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test_tt_SOURCES = tt.c $(top_srcdir)/lib/mbsalign.c
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test_canonicalize_SOURCES = canonicalize.c
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test_canonicalize_CFLAGS = -DTEST_PROGRAM_CANONICALIZE
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if LINUX
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test_blkdev_SOURCES += linux_version.c
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@ -189,7 +189,7 @@ canonicalize_path(const char *path)
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}
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#ifdef TEST_PROGRAM
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#ifdef TEST_PROGRAM_CANONICALIZE
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int main(int argc, char **argv)
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{
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if (argc < 2) {
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