1 files changed, 0 insertions, 1559 deletions

diff --git a/libblkid/loopdev.c b/libblkid/loopdev.c
deleted file mode 100644
index a25a2fae4..000000000
--- a/libblkid/loopdev.c
+++ /dev/null
@@ -1,1559 +0,0 @@
-/*
- * No copyright is claimed.  This code is in the public domain; do with
- * it what you wish.
- *
- * Written by Karel Zak <kzak@redhat.com>
- *
- * -- based on mount/losetup.c
- *
- * Simple library for work with loop devices.
- *
- *  - requires kernel 2.6.x
- *  - reads info from /sys/block/loop<N>/loop/<attr> (new kernels)
- *  - reads info by ioctl
- *  - supports *unlimited* number of loop devices
- *  - supports /dev/loop<N> as well as /dev/loop/<N>
- *  - minimize overhead (fd, loopinfo, ... are shared for all operations)
- *  - setup (associate device and backing file)
- *  - delete (dis-associate file)
- *  - old LOOP_{SET,GET}_STATUS (32bit) ioctls are unsupported
- *  - extendible
- */
-#include <stdio.h>
-#include <stdint.h>
-#include <string.h>
-#include <ctype.h>
-#include <fcntl.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <sys/ioctl.h>
-#include <sys/stat.h>
-#include <sys/mman.h>
-#include <sys/sysmacros.h>
-#include <inttypes.h>
-#include <dirent.h>
-#include <linux/posix_types.h>
-
-#include "linux_version.h"
-#include "c.h"
-#include "sysfs.h"
-#include "pathnames.h"
-#include "loopdev.h"
-#include "canonicalize.h"
-#include "at.h"
-
-#define CONFIG_LOOPDEV_DEBUG
-
-#ifdef CONFIG_LOOPDEV_DEBUG
-# include <stdarg.h>
-
-# define DBG(l,x)	do { \
-				if ((l)->debug) {\
-					fprintf(stderr, "loopdev:  [%p]: ", (l)); \
-					x; \
-				} \
-			} while(0)
-
-static inline void __attribute__ ((__format__ (__printf__, 1, 2)))
-loopdev_debug(const char *mesg, ...)
-{
-	va_list ap;
-	va_start(ap, mesg);
-	vfprintf(stderr, mesg, ap);
-	va_end(ap);
-	fputc('\n', stderr);
-}
-
-#else /* !CONFIG_LOOPDEV_DEBUG */
-# define DBG(m,x) do { ; } while(0)
-#endif
-
-/*
- * see loopcxt_init()
- */
-#define loopcxt_ioctl_enabled(_lc)	(!((_lc)->flags & LOOPDEV_FL_NOIOCTL))
-#define loopcxt_sysfs_available(_lc)	(!((_lc)->flags & LOOPDEV_FL_NOSYSFS)) \
-					 && !loopcxt_ioctl_enabled(_lc)
-
-/*
- * @lc: context
- * @device: device name, absolute device path or NULL to reset the current setting
- *
- * Sets device, absolute paths (e.g. "/dev/loop<N>") are unchanged, device
- * names ("loop<N>") are converted to the path (/dev/loop<N> or to
- * /dev/loop/<N>)
- *
- * Returns: <0 on error, 0 on success
- */
-int loopcxt_set_device(struct loopdev_cxt *lc, const char *device)
-{
-	if (!lc)
-		return -EINVAL;
-
-	if (lc->fd >= 0) {
-		close(lc->fd);
-		DBG(lc, loopdev_debug("closing old open fd"));
-	}
-	lc->fd = -1;
-	lc->mode = 0;
-	lc->has_info = 0;
-	lc->info_failed = 0;
-	*lc->device = '\0';
-	memset(&lc->info, 0, sizeof(lc->info));
-
-	/* set new */
-	if (device) {
-		if (*device != '/') {
-			const char *dir = _PATH_DEV;
-
-			/* compose device name for /dev/loop<n> or /dev/loop/<n> */
-			if (lc->flags & LOOPDEV_FL_DEVSUBDIR) {
-				if (strlen(device) < 5)
-					return -1;
-				device += 4;
-				dir = _PATH_DEV_LOOP "/";	/* _PATH_DEV uses tailing slash */
-			}
-			snprintf(lc->device, sizeof(lc->device), "%s%s",
-				dir, device);
-		} else {
-			strncpy(lc->device, device, sizeof(lc->device));
-			lc->device[sizeof(lc->device) - 1] = '\0';
-		}
-		DBG(lc, loopdev_debug("%s successfully assigned", device));
-	}
-
-	sysfs_deinit(&lc->sysfs);
-	return 0;
-}
-
-int loopcxt_has_device(struct loopdev_cxt *lc)
-{
-	return lc && *lc->device;
-}
-
-/*
- * @lc: context
- * @flags: LOOPDEV_FL_* flags
- *
- * Initilize loop handler.
- *
- * We have two sets of the flags:
- *
- *	* LOOPDEV_FL_* flags control loopcxt_* API behavior
- *
- *	* LO_FLAGS_* are kernel flags used for LOOP_{SET,GET}_STAT64 ioctls
- *
- * Note about LOOPDEV_FL_{RDONLY,RDWR} flags. These flags are used for open(2)
- * syscall to open loop device. By default is the device open read-only.
- *
- * The expection is loopcxt_setup_device(), where the device is open read-write
- * if LO_FLAGS_READ_ONLY flags is not set (see loopcxt_set_flags()).
- *
- * Returns: <0 on error, 0 on success.
- */
-int loopcxt_init(struct loopdev_cxt *lc, int flags)
-{
-	int rc;
-	struct stat st;
-	struct loopdev_cxt dummy = UL_LOOPDEVCXT_EMPTY;
-
-	if (!lc)
-		return -EINVAL;
-
-	memcpy(lc, &dummy, sizeof(dummy));
-	lc->flags = flags;
-
-	if (getenv("LOOPDEV_DEBUG"))
-		loopcxt_enable_debug(lc, TRUE);
-
-	rc = loopcxt_set_device(lc, NULL);
-	if (rc)
-		return rc;
-
-	if (stat(_PATH_SYS_BLOCK, &st) || !S_ISDIR(st.st_mode)) {
-		lc->flags |= LOOPDEV_FL_NOSYSFS;
-		lc->flags &= ~LOOPDEV_FL_NOIOCTL;
-		DBG(lc, loopdev_debug("init: disable /sys usage"));
-	}
-
-	if (!(lc->flags & LOOPDEV_FL_NOSYSFS) &&
-	    get_linux_version() >= KERNEL_VERSION(2,6,37)) {
-		/*
-		 * Use only sysfs for basic information about loop devices
-		 */
-		lc->flags |= LOOPDEV_FL_NOIOCTL;
-		DBG(lc, loopdev_debug("init: ignore ioctls"));
-	}
-
-	if (!(lc->flags & LOOPDEV_FL_CONTROL) && !stat(_PATH_DEV_LOOPCTL, &st)) {
-		lc->flags |= LOOPDEV_FL_CONTROL;
-		DBG(lc, loopdev_debug("init: loop-control detected "));
-	}
-
-	return 0;
-}
-
-/*
- * @lc: context
- *
- * Deinitialize loop context
- */
-void loopcxt_deinit(struct loopdev_cxt *lc)
-{
-	int errsv = errno;
-
-	if (!lc)
-		return;
-
-	DBG(lc, loopdev_debug("de-initialize"));
-
-	free(lc->filename);
-	lc->filename = NULL;
-
-	ignore_result( loopcxt_set_device(lc, NULL) );
-	loopcxt_deinit_iterator(lc);
-
-	errno = errsv;
-}
-
-/*
- * @lc: context
- * @enable: TRUE/FALSE
- *
- * Enabled/disables debug messages
- */
-void loopcxt_enable_debug(struct loopdev_cxt *lc, int enable)
-{
-	if (lc)
-		lc->debug = enable ? 1 : 0;
-}
-
-/*
- * @lc: context
- *
- * Returns newly allocated device path.
- */
-char *loopcxt_strdup_device(struct loopdev_cxt *lc)
-{
-	if (!lc || !lc->device || !*lc->device)
-		return NULL;
-	return strdup(lc->device);
-}
-
-/*
- * @lc: context
- *
- * Returns pointer device name in the @lc struct.
- */
-const char *loopcxt_get_device(struct loopdev_cxt *lc)
-{
-	return lc && lc->device && *lc->device ? lc->device : NULL;
-}
-
-/*
- * @lc: context
- *
- * Returns pointer to the sysfs context (see lib/sysfs.c)
- */
-struct sysfs_cxt *loopcxt_get_sysfs(struct loopdev_cxt *lc)
-{
-	if (!lc || !*lc->device || (lc->flags & LOOPDEV_FL_NOSYSFS))
-		return NULL;
-
-	if (!lc->sysfs.devno) {
-		dev_t devno = sysfs_devname_to_devno(lc->device, NULL);
-		if (!devno) {
-			DBG(lc, loopdev_debug("sysfs: failed devname to devno"));
-			return NULL;
-		}
-		if (sysfs_init(&lc->sysfs, devno, NULL)) {
-			DBG(lc, loopdev_debug("sysfs: init failed"));
-			return NULL;
-		}
-	}
-
-	return &lc->sysfs;
-}
-
-/*
- * @lc: context
- *
- * Returns: file descriptor to the open loop device or <0 on error. The mode
- *          depends on LOOPDEV_FL_{RDWR,RDONLY} context flags. Default is
- *          read-only.
- */
-int loopcxt_get_fd(struct loopdev_cxt *lc)
-{
-	if (!lc || !*lc->device)
-		return -EINVAL;
-
-	if (lc->fd < 0) {
-		lc->mode = lc->flags & LOOPDEV_FL_RDWR ? O_RDWR : O_RDONLY;
-		lc->fd = open(lc->device, lc->mode);
-		DBG(lc, loopdev_debug("open %s [%s]: %s", lc->device,
-				lc->flags & LOOPDEV_FL_RDWR ? "rw" : "ro",
-				lc->fd < 0 ? "failed" : "ok"));
-	}
-	return lc->fd;
-}
-
-int loopcxt_set_fd(struct loopdev_cxt *lc, int fd, int mode)
-{
-	if (!lc)
-		return -EINVAL;
-
-	lc->fd = fd;
-	lc->mode = mode;
-	return 0;
-}
-
-/*
- * @lc: context
- * @flags: LOOPITER_FL_* flags
- *
- * Iterator allows to scan list of the free or used loop devices.
- *
- * Returns: <0 on error, 0 on success
- */
-int loopcxt_init_iterator(struct loopdev_cxt *lc, int flags)
-{
-	struct loopdev_iter *iter;
-	struct stat st;
-
-	if (!lc)
-		return -EINVAL;
-
-	DBG(lc, loopdev_debug("iter: initialize"));
-
-	iter = &lc->iter;
-
-	/* always zeroize
-	 */
-	memset(iter, 0, sizeof(*iter));
-	iter->ncur = -1;
-	iter->flags = flags;
-	iter->default_check = 1;
-
-	if (!lc->extra_check) {
-		/*
-		 * Check for /dev/loop/<N> subdirectory
-		 */
-		if (!(lc->flags & LOOPDEV_FL_DEVSUBDIR) &&
-		    stat(_PATH_DEV_LOOP, &st) == 0 && S_ISDIR(st.st_mode))
-			lc->flags |= LOOPDEV_FL_DEVSUBDIR;
-
-		lc->extra_check = 1;
-	}
-	return 0;
-}
-
-/*
- * @lc: context
- *
- * Returns: <0 on error, 0 on success
- */
-int loopcxt_deinit_iterator(struct loopdev_cxt *lc)
-{
-	struct loopdev_iter *iter;
-
-	if (!lc)
-		return -EINVAL;
-
-	DBG(lc, loopdev_debug("iter: de-initialize"));
-
-	iter = &lc->iter;
-
-	free(iter->minors);
-	if (iter->proc)
-		fclose(iter->proc);
-	if (iter->sysblock)
-		closedir(iter->sysblock);
-	iter->minors = NULL;
-	iter->proc = NULL;
-	iter->sysblock = NULL;
-	iter->done = 1;
-	return 0;
-}
-
-/*
- * Same as loopcxt_set_device, but also checks if the device is
- * associeted with any file.
- *
- * Returns: <0 on error, 0 on success, 1 device does not match with
- *         LOOPITER_FL_{USED,FREE} flags.
- */
-static int loopiter_set_device(struct loopdev_cxt *lc, const char *device)
-{
-	int rc = loopcxt_set_device(lc, device);
-	int used;
-
-	if (rc)
-		return rc;
-
-	if (!(lc->iter.flags & LOOPITER_FL_USED) &&
-	    !(lc->iter.flags & LOOPITER_FL_FREE))
-		return 0;	/* caller does not care about device status */
-
-	used = loopcxt_get_offset(lc, NULL) == 0;
-
-	if ((lc->iter.flags & LOOPITER_FL_USED) && used)
-		return 0;
-
-	if ((lc->iter.flags & LOOPITER_FL_FREE) && !used)
-		return 0;
-
-	DBG(lc, loopdev_debug("iter: unset device"));
-	ignore_result( loopcxt_set_device(lc, NULL) );
-	return 1;
-}
-
-static int cmpnum(const void *p1, const void *p2)
-{
-	return (((* (int *) p1) > (* (int *) p2)) -
-			((* (int *) p1) < (* (int *) p2)));
-}
-
-/*
- * The classic scandir() is more expensive and less portable.
- * We needn't full loop device names -- loop numbers (loop<N>)
- * are enough.
- */
-static int loop_scandir(const char *dirname, int **ary, int hasprefix)
-{
-	DIR *dir;
-	struct dirent *d;
-	unsigned int n, count = 0, arylen = 0;
-
-	if (!dirname || !ary)
-		return 0;
-	dir = opendir(dirname);
-	if (!dir)
-		return 0;
-	free(*ary);
-	*ary = NULL;
-
-	while((d = readdir(dir))) {
-#ifdef _DIRENT_HAVE_D_TYPE
-		if (d->d_type != DT_BLK && d->d_type != DT_UNKNOWN &&
-		    d->d_type != DT_LNK)
-			continue;
-#endif
-		if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
-			continue;
-
-		if (hasprefix) {
-			/* /dev/loop<N> */
-			if (sscanf(d->d_name, "loop%u", &n) != 1)
-				continue;
-		} else {
-			/* /dev/loop/<N> */
-			char *end = NULL;
-
-			n = strtol(d->d_name, &end, 10);
-			if (d->d_name == end || (end && *end) || errno)
-				continue;
-		}
-		if (n < LOOPDEV_DEFAULT_NNODES)
-			continue;			/* ignore loop<0..7> */
-
-		if (count + 1 > arylen) {
-			int *tmp;
-
-			arylen += 1;
-
-			tmp = realloc(*ary, arylen * sizeof(int));
-			if (!tmp) {
-				free(*ary);
-				closedir(dir);
-				return -1;
-			}
-			*ary = tmp;
-		}
-		if (*ary)
-			(*ary)[count++] = n;
-	}
-	if (count && *ary)
-		qsort(*ary, count, sizeof(int), cmpnum);
-
-	closedir(dir);
-	return count;
-}
-
-/*
- * Set the next *used* loop device according to /proc/partitions.
- *
- * Loop devices smaller than 512 bytes are invisible for this function.
- */
-static int loopcxt_next_from_proc(struct loopdev_cxt *lc)
-{
-	struct loopdev_iter *iter = &lc->iter;
-	char buf[BUFSIZ];
-
-	DBG(lc, loopdev_debug("iter: scan /proc/partitions"));
-
-	if (!iter->proc)
-		iter->proc = fopen(_PATH_PROC_PARTITIONS, "r");
-	if (!iter->proc)
-		return 1;
-
-	while (fgets(buf, sizeof(buf), iter->proc)) {
-		unsigned int m;
-		char name[128 + 1];
-
-
-		if (sscanf(buf, " %u %*s %*s %128[^\n ]",
-			   &m, name) != 2 || m != LOOPDEV_MAJOR)
-			continue;
-
-		DBG(lc, loopdev_debug("iter: check %s", name));
-
-		if (loopiter_set_device(lc, name) == 0)
-			return 0;
-	}
-
-	return 1;
-}
-
-/*
- * Set the next *used* loop device according to
- * /sys/block/loopN/loop/backing_file (kernel >= 2.6.37 is required).
- *
- * This is preferred method.
- */
-static int loopcxt_next_from_sysfs(struct loopdev_cxt *lc)
-{
-	struct loopdev_iter *iter = &lc->iter;
-	struct dirent *d;
-	int fd;
-
-	DBG(lc, loopdev_debug("iter: scan /sys/block"));
-
-	if (!iter->sysblock)
-		iter->sysblock = opendir(_PATH_SYS_BLOCK);
-
-	if (!iter->sysblock)
-		return 1;
-
-	fd = dirfd(iter->sysblock);
-
-	while ((d = readdir(iter->sysblock))) {
-		char name[256];
-		struct stat st;
-
-		DBG(lc, loopdev_debug("iter: check %s", d->d_name));
-
-		if (strcmp(d->d_name, ".") == 0
-		    || strcmp(d->d_name, "..") == 0
-		    || strncmp(d->d_name, "loop", 4) != 0)
-			continue;
-
-		snprintf(name, sizeof(name), "%s/loop/backing_file", d->d_name);
-		if (fstat_at(fd, _PATH_SYS_BLOCK, name, &st, 0) != 0)
-			continue;
-
-		if (loopiter_set_device(lc, d->d_name) == 0)
-			return 0;
-	}
-
-	return 1;
-}
-
-/*
- * @lc: context, has to initialized by loopcxt_init_iterator()
- *
- * Returns: 0 on success, -1 on error, 1 at the end of scanning. The details
- *          about the current loop device are available by
- *          loopcxt_get_{fd,backing_file,device,offset, ...} functions.
- */
-int loopcxt_next(struct loopdev_cxt *lc)
-{
-	struct loopdev_iter *iter;
-
-	if (!lc)
-		return -EINVAL;
-
-	DBG(lc, loopdev_debug("iter: next"));
-
-	iter = &lc->iter;
-	if (iter->done)
-		return 1;
-
-	/* A) Look for used loop devices in /proc/partitions ("losetup -a" only)
-	 */
-	if (iter->flags & LOOPITER_FL_USED) {
-		int rc;
-
-		if (loopcxt_sysfs_available(lc))
-			rc = loopcxt_next_from_sysfs(lc);
-		else
-			rc = loopcxt_next_from_proc(lc);
-		if (rc == 0)
-			return 0;
-		goto done;
-	}
-
-	/* B) Classic way, try first eight loop devices (default number
-	 *    of loop devices). This is enough for 99% of all cases.
-	 */
-	if (iter->default_check) {
-		DBG(lc, loopdev_debug("iter: next: default check"));
-		for (++iter->ncur; iter->ncur < LOOPDEV_DEFAULT_NNODES;
-							iter->ncur++) {
-			char name[16];
-			snprintf(name, sizeof(name), "loop%d", iter->ncur);
-
-			if (loopiter_set_device(lc, name) == 0)
-				return 0;
-		}
-		iter->default_check = 0;
-	}
-
-	/* C) the worst possibility, scan whole /dev or /dev/loop/<N>
-	 */
-	if (!iter->minors) {
-		DBG(lc, loopdev_debug("iter: next: scan /dev"));
-		iter->nminors = (lc->flags & LOOPDEV_FL_DEVSUBDIR) ?
-			loop_scandir(_PATH_DEV_LOOP, &iter->minors, 0) :
-			loop_scandir(_PATH_DEV, &iter->minors, 1);
-		iter->ncur = -1;
-	}
-	for (++iter->ncur; iter->ncur < iter->nminors; iter->ncur++) {
-		char name[16];
-		snprintf(name, sizeof(name), "loop%d", iter->minors[iter->ncur]);
-
-		if (loopiter_set_device(lc, name) == 0)
-			return 0;
-	}
-done:
-	loopcxt_deinit_iterator(lc);
-	return 1;
-}
-
-/*
- * @device: path to device
- */
-int is_loopdev(const char *device)
-{
-	struct stat st;
-
-	if (!device)
-		return 0;
-
-	return (stat(device, &st) == 0 &&
-		S_ISBLK(st.st_mode) &&
-		major(st.st_rdev) == LOOPDEV_MAJOR);
-}
-
-/*
- * @lc: context
- *
- * Returns result from LOOP_GET_STAT64 ioctl or NULL on error.
- */
-struct loop_info64 *loopcxt_get_info(struct loopdev_cxt *lc)
-{
-	int fd;
-
-	if (!lc || lc->info_failed)
-		return NULL;
-	if (lc->has_info)
-		return &lc->info;
-
-	fd = loopcxt_get_fd(lc);
-	if (fd < 0)
-		return NULL;
-
-	if (ioctl(fd, LOOP_GET_STATUS64, &lc->info) == 0) {
-		lc->has_info = 1;
-		lc->info_failed = 0;
-		DBG(lc, loopdev_debug("reading loop_info64 OK"));
-		return &lc->info;
-	} else {
-		lc->info_failed = 1;
-		DBG(lc, loopdev_debug("reading loop_info64 FAILED"));
-	}
-
-	return NULL;
-}
-
-/*
- * @lc: context
- *
- * Returns (allocated) string with path to the file assicieted
- * with the current loop device.
- */
-char *loopcxt_get_backing_file(struct loopdev_cxt *lc)
-{
-	struct sysfs_cxt *sysfs = loopcxt_get_sysfs(lc);
-	char *res = NULL;
-
-	if (sysfs)
-		/*
-		 * This is always preffered, the loop_info64
-		 * has too small buffer for the filename.
-		 */
-		res = sysfs_strdup(sysfs, "loop/backing_file");
-
-	if (!res && loopcxt_ioctl_enabled(lc)) {
-		struct loop_info64 *lo = loopcxt_get_info(lc);
-
-		if (lo) {
-			lo->lo_file_name[LO_NAME_SIZE - 2] = '*';
-			lo->lo_file_name[LO_NAME_SIZE - 1] = '\0';
-			res = strdup((char *) lo->lo_file_name);
-		}
-	}
-
-	DBG(lc, loopdev_debug("get_backing_file [%s]", res));
-	return res;
-}
-
-/*
- * @lc: context
- * @offset: returns offset number for the given device
- *
- * Returns: <0 on error, 0 on success
- */
-int loopcxt_get_offset(struct loopdev_cxt *lc, uint64_t *offset)
-{
-	struct sysfs_cxt *sysfs = loopcxt_get_sysfs(lc);
-	int rc = -EINVAL;
-
-	if (sysfs)
-		rc = sysfs_read_u64(sysfs, "loop/offset", offset);
-
-	if (rc && loopcxt_ioctl_enabled(lc)) {
-		struct loop_info64 *lo = loopcxt_get_info(lc);
-		if (lo) {
-			if (offset)
-				*offset = lo->lo_offset;
-			rc = 0;
-		}
-	}
-
-	DBG(lc, loopdev_debug("get_offset [rc=%d]", rc));
-	return rc;
-}
-
-/*
- * @lc: context
- * @sizelimit: returns size limit for the given device
- *
- * Returns: <0 on error, 0 on success
- */
-int loopcxt_get_sizelimit(struct loopdev_cxt *lc, uint64_t *size)
-{
-	struct sysfs_cxt *sysfs = loopcxt_get_sysfs(lc);
-	int rc = -EINVAL;
-
-	if (sysfs)
-		rc = sysfs_read_u64(sysfs, "loop/sizelimit", size);
-
-	if (rc && loopcxt_ioctl_enabled(lc)) {
-		struct loop_info64 *lo = loopcxt_get_info(lc);
-		if (lo) {
-			if (size)
-				*size = lo->lo_sizelimit;
-			rc = 0;
-		}
-	}
-
-	DBG(lc, loopdev_debug("get_sizelimit [rc=%d]", rc));
-	return rc;
-}
-
-/*
- * @lc: context
- * @devno: returns encryption type
- *
- * Cryptoloop is DEPRECATED!
- *
- * Returns: <0 on error, 0 on success
- */
-int loopcxt_get_encrypt_type(struct loopdev_cxt *lc, uint32_t *type)
-{
-	struct loop_info64 *lo = loopcxt_get_info(lc);
-	int rc = -EINVAL;
-
-	if (lo) {
-		if (type)
-			*type = lo->lo_encrypt_type;
-		rc = 0;
-	}
-	DBG(lc, loopdev_debug("get_encrypt_type [rc=%d]", rc));
-	return rc;
-}
-
-/*
- * @lc: context
- * @devno: returns crypt name
- *
- * Cryptoloop is DEPRECATED!
- *
- * Returns: <0 on error, 0 on success
- */
-const char *loopcxt_get_crypt_name(struct loopdev_cxt *lc)
-{
-	struct loop_info64 *lo = loopcxt_get_info(lc);
-
-	if (lo)
-		return (char *) lo->lo_crypt_name;
-
-	DBG(lc, loopdev_debug("get_crypt_name failed"));
-	return NULL;
-}
-
-/*
- * @lc: context
- * @devno: returns backing file devno
- *
- * Returns: <0 on error, 0 on success
- */
-int loopcxt_get_backing_devno(struct loopdev_cxt *lc, dev_t *devno)
-{
-	struct loop_info64 *lo = loopcxt_get_info(lc);
-	int rc = -EINVAL;
-
-	if (lo) {
-		if (devno)
-			*devno = lo->lo_device;
-		rc = 0;
-	}
-	DBG(lc, loopdev_debug("get_backing_devno [rc=%d]", rc));
-	return rc;
-}
-
-/*
- * @lc: context
- * @ino: returns backing file inode
- *
- * Returns: <0 on error, 0 on success
- */
-int loopcxt_get_backing_inode(struct loopdev_cxt *lc, ino_t *ino)
-{
-	struct loop_info64 *lo = loopcxt_get_info(lc);
-	int rc = -EINVAL;
-
-	if (lo) {
-		if (ino)
-			*ino = lo->lo_inode;
-		rc = 0;
-	}
-	DBG(lc, loopdev_debug("get_backing_inode [rc=%d]", rc));
-	return rc;
-}
-
-/*
- * Check if the kernel supports partitioned loop devices.
- *
- * Notes:
- *   - kernels < 3.2 support partitioned loop devices and PT scanning
- *     only if max_part= module paremeter is non-zero
- *
- *   - kernels >= 3.2 always support partitioned loop devices
- *
- *   - kernels >= 3.2 always support BLKPG_{ADD,DEL}_PARTITION ioctls
- *
- *   - kernels >= 3.2 enable PT scanner only if max_part= is non-zero or if the
- *     LO_FLAGS_PARTSCAN flag is set for the device. The PT scanner is disabled
- *     by default.
- *
- *  See kernel commit e03c8dd14915fabc101aa495828d58598dc5af98.
- */
-int loopmod_supports_partscan(void)
-{
-	int rc, ret = 0;
-	FILE *f;
-
-	if (get_linux_version() >= KERNEL_VERSION(3,2,0))
-		return 1;
-
-	f = fopen("/sys/module/loop/parameters/max_part", "r");
-	if (!f)
-		return 0;
-	rc = fscanf(f, "%d", &ret);
-	fclose(f);
-	return rc == 1 ? ret : 0;
-}
-
-/*
- * @lc: context
- *
- * Returns: 1 if the partscan flags is set *or* (for old kernels) partitions
- * scannig is enabled for all loop devices.
- */
-int loopcxt_is_partscan(struct loopdev_cxt *lc)
-{
-	struct sysfs_cxt *sysfs = loopcxt_get_sysfs(lc);
-
-	if (sysfs) {
-		/* kernel >= 3.2 */
-		int fl;
-		if (sysfs_read_int(sysfs, "loop/partscan", &fl) == 0)
-			return fl;
-	}
-
-	/* old kernels (including kernels without loopN/loop/<flags> directory */
-	return loopmod_supports_partscan();
-}
-
-/*
- * @lc: context
- *
- * Returns: 1 if the autoclear flags is set.
- */
-int loopcxt_is_autoclear(struct loopdev_cxt *lc)
-{
-	struct sysfs_cxt *sysfs = loopcxt_get_sysfs(lc);
-
-	if (sysfs) {
-		int fl;
-		if (sysfs_read_int(sysfs, "loop/autoclear", &fl) == 0)
-			return fl;
-	}
-
-	if (loopcxt_ioctl_enabled(lc)) {
-		struct loop_info64 *lo = loopcxt_get_info(lc);
-		if (lo)
-			return lo->lo_flags & LO_FLAGS_AUTOCLEAR;
-	}
-	return 0;
-}
-
-/*
- * @lc: context
- *
- * Returns: 1 if the readonly flags is set.
- */
-int loopcxt_is_readonly(struct loopdev_cxt *lc)
-{
-	struct sysfs_cxt *sysfs = loopcxt_get_sysfs(lc);
-
-	if (sysfs) {
-		int fl;
-		if (sysfs_read_int(sysfs, "ro", &fl) == 0)
-			return fl;
-	}
-
-	if (loopcxt_ioctl_enabled(lc)) {
-		struct loop_info64 *lo = loopcxt_get_info(lc);
-		if (lo)
-			return lo->lo_flags & LO_FLAGS_READ_ONLY;
-	}
-	return 0;
-}
-
-/*
- * @lc: context
- * @st: backing file stat or NULL
- * @backing_file: filename
- * @offset: offset
- * @flags: LOOPDEV_FL_OFFSET if @offset should not be ignored
- *
- * Returns 1 if the current @lc loopdev is associated with the given backing
- * file. Note that the preferred way is to use devno and inode number rather
- * than filename. The @backing_file filename is poor solution usable in case
- * that you don't have rights to call stat().
- *
- * Don't forget that old kernels provide very restricted (in size) backing
- * filename by LOOP_GET_STAT64 ioctl only.
- */
-int loopcxt_is_used(struct loopdev_cxt *lc,
-		    struct stat *st,
-		    const char *backing_file,
-		    uint64_t offset,
-		    int flags)
-{
-	ino_t ino;
-	dev_t dev;
-
-	if (!lc)
-		return 0;
-
-	DBG(lc, loopdev_debug("checking %s vs. %s",
-				loopcxt_get_device(lc),
-				backing_file));
-
-	if (st && loopcxt_get_backing_inode(lc, &ino) == 0 &&
-		  loopcxt_get_backing_devno(lc, &dev) == 0) {
-
-		if (ino == st->st_ino && dev == st->st_dev)
-			goto found;
-
-		/* don't use filename if we have devno and inode */
-		return 0;
-	}
-
-	/* poor man's solution */
-	if (backing_file) {
-		char *name = loopcxt_get_backing_file(lc);
-		int rc = name && strcmp(name, backing_file) == 0;
-
-		free(name);
-		if (rc)
-			goto found;
-	}
-
-	return 0;
-found:
-	if (flags & LOOPDEV_FL_OFFSET) {
-		uint64_t off;
-
-		return loopcxt_get_offset(lc, &off) == 0 && off == offset;
-	}
-	return 1;
-}
-
-/*
- * The setting is removed by loopcxt_set_device() loopcxt_next()!
- */
-int loopcxt_set_offset(struct loopdev_cxt *lc, uint64_t offset)
-{
-	if (!lc)
-		return -EINVAL;
-	lc->info.lo_offset = offset;
-
-	DBG(lc, loopdev_debug("set offset=%jd", offset));
-	return 0;
-}
-
-/*
- * The setting is removed by loopcxt_set_device() loopcxt_next()!
- */
-int loopcxt_set_sizelimit(struct loopdev_cxt *lc, uint64_t sizelimit)
-{
-	if (!lc)
-		return -EINVAL;
-	lc->info.lo_sizelimit = sizelimit;
-
-	DBG(lc, loopdev_debug("set sizelimit=%jd", sizelimit));
-	return 0;
-}
-
-/*
- * @lc: context
- * @flags: kernel LO_FLAGS_{READ_ONLY,USE_AOPS,AUTOCLEAR} flags
- *
- * The setting is removed by loopcxt_set_device() loopcxt_next()!
- *
- * Returns: 0 on success, <0 on error.
- */
-int loopcxt_set_flags(struct loopdev_cxt *lc, uint32_t flags)
-{
-	if (!lc)
-		return -EINVAL;
-	lc->info.lo_flags = flags;
-
-	DBG(lc, loopdev_debug("set flags=%u", (unsigned) flags));
-	return 0;
-}
-
-/*
- * @lc: context
- * @filename: backing file path (the path will be canonicalized)
- *
- * The setting is removed by loopcxt_set_device() loopcxt_next()!
- *
- * Returns: 0 on success, <0 on error.
- */
-int loopcxt_set_backing_file(struct loopdev_cxt *lc, const char *filename)
-{
-	if (!lc)
-		return -EINVAL;
-
-	lc->filename = canonicalize_path(filename);
-	if (!lc->filename)
-		return -errno;
-
-	strncpy((char *)lc->info.lo_file_name, lc->filename, LO_NAME_SIZE);
-	lc->info.lo_file_name[LO_NAME_SIZE- 1] = '\0';
-
-	DBG(lc, loopdev_debug("set backing file=%s", lc->info.lo_file_name));
-	return 0;
-}
-
-/*
- * @cl: context
- *
- * Associate the current device (see loopcxt_{set,get}_device()) with
- * a file (see loopcxt_set_backing_file()).
- *
- * The device is initialized read-write by default. If you want read-only
- * device then set LO_FLAGS_READ_ONLY by loopcxt_set_flags(). The LOOPDEV_FL_*
- * flags are ignored and modified according to LO_FLAGS_*.
- *
- * If the device is already open by loopcxt_get_fd() then this setup device
- * function will re-open the device to fix read/write mode.
- *
- * The device is also initialized read-only if the backing file is not
- * possible to open read-write (e.g. read-only FS).
- *
- * Returns: <0 on error, 0 on success.
- */
-int loopcxt_setup_device(struct loopdev_cxt *lc)
-{
-	int file_fd, dev_fd, mode = O_RDWR, rc = -1;
-
-	if (!lc || !*lc->device || !lc->filename)
-		return -EINVAL;
-
-	DBG(lc, loopdev_debug("device setup requested"));
-
-	/*
-	 * Open backing file and device
-	 */
-	if (lc->info.lo_flags & LO_FLAGS_READ_ONLY)
-		mode = O_RDONLY;
-
-	if ((file_fd = open(lc->filename, mode)) < 0) {
-		if (mode != O_RDONLY && (errno == EROFS || errno == EACCES))
-			file_fd = open(lc->filename, mode = O_RDONLY);
-
-		if (file_fd < 0) {
-			DBG(lc, loopdev_debug("open backing file failed: %m"));
-			return -errno;
-		}
-	}
-	DBG(lc, loopdev_debug("setup: backing file open: OK"));
-
-	if (lc->fd != -1 && lc->mode != mode) {
-		DBG(lc, loopdev_debug("closing already open device (mode mismatch)"));
-		close(lc->fd);
-		lc->fd = -1;
-		lc->mode = 0;
-	}
-
-	if (mode == O_RDONLY) {
-		lc->flags |= LOOPDEV_FL_RDONLY;			/* open() mode */
-		lc->info.lo_flags |= LO_FLAGS_READ_ONLY;	/* kernel loopdev mode */
-	} else {
-		lc->flags |= LOOPDEV_FL_RDWR;			/* open() mode */
-		lc->info.lo_flags &= ~LO_FLAGS_READ_ONLY;
-		lc->flags &= ~LOOPDEV_FL_RDONLY;
-	}
-
-	dev_fd = loopcxt_get_fd(lc);
-	if (dev_fd < 0) {
-		rc = -errno;
-		goto err;
-	}
-
-	DBG(lc, loopdev_debug("setup: device open: OK"));
-
-	/*
-	 * Set FD
-	 */
-	if (ioctl(dev_fd, LOOP_SET_FD, file_fd) < 0) {
-		rc = -errno;
-		DBG(lc, loopdev_debug("LOOP_SET_FD failed: %m"));
-		goto err;
-	}
-
-	DBG(lc, loopdev_debug("setup: LOOP_SET_FD: OK"));
-
-	close(file_fd);
-	file_fd = -1;
-
-	if (ioctl(dev_fd, LOOP_SET_STATUS64, &lc->info)) {
-		DBG(lc, loopdev_debug("LOOP_SET_STATUS64 failed: %m"));
-		goto err;
-	}
-
-	DBG(lc, loopdev_debug("setup: LOOP_SET_STATUS64: OK"));
-
-	memset(&lc->info, 0, sizeof(lc->info));
-	lc->has_info = 0;
-	lc->info_failed = 0;
-
-	DBG(lc, loopdev_debug("setup success [rc=0]"));
-	return 0;
-err:
-	if (file_fd >= 0)
-		close(file_fd);
-	if (dev_fd >= 0)
-		ioctl(dev_fd, LOOP_CLR_FD, 0);
-
-	DBG(lc, loopdev_debug("setup failed [rc=%d]", rc));
-	return rc;
-}
-
-int loopcxt_delete_device(struct loopdev_cxt *lc)
-{
-	int fd = loopcxt_get_fd(lc);
-
-	if (fd < 0)
-		return -EINVAL;
-
-	if (ioctl(fd, LOOP_CLR_FD, 0) < 0) {
-		DBG(lc, loopdev_debug("LOOP_CLR_FD failed: %m"));
-		return -errno;
-	}
-
-	DBG(lc, loopdev_debug("device removed"));
-	return 0;
-}
-
-/*
- * Note that LOOP_CTL_GET_FREE ioctl is supported since kernel 3.1. In older
- * kernels we have to check all loop devices to found unused one.
- *
- * See kernel commit 770fe30a46a12b6fb6b63fbe1737654d28e8484.
- */
-int loopcxt_find_unused(struct loopdev_cxt *lc)
-{
-	int rc = -1;
-
-	DBG(lc, loopdev_debug("find_unused requested"));
-
-	if (lc->flags & LOOPDEV_FL_CONTROL) {
-		int ctl = open(_PATH_DEV_LOOPCTL, O_RDWR);
-
-		if (ctl >= 0)
-			rc = ioctl(ctl, LOOP_CTL_GET_FREE);
-		if (rc >= 0) {
-			char name[16];
-			snprintf(name, sizeof(name), "loop%d", rc);
-
-			rc = loopiter_set_device(lc, name);
-		}
-		if (ctl >= 0)
-			close(ctl);
-		DBG(lc, loopdev_debug("find_unused by loop-control [rc=%d]", rc));
-	}
-
-	if (rc < 0) {
-		rc = loopcxt_init_iterator(lc, LOOPITER_FL_FREE);
-		if (rc)
-			return rc;
-
-		rc = loopcxt_next(lc);
-		loopcxt_deinit_iterator(lc);
-		DBG(lc, loopdev_debug("find_unused by scan [rc=%d]", rc));
-	}
-	return rc;
-}
-
-
-
-/*
- * Return: TRUE/FALSE
- */
-int loopdev_is_autoclear(const char *device)
-{
-	struct loopdev_cxt lc;
-	int rc;
-
-	if (!device)
-		return 0;
-
-	rc = loopcxt_init(&lc, 0);
-	if (!rc)
-		rc = loopcxt_set_device(&lc, device);
-	if (!rc)
-		rc = loopcxt_is_autoclear(&lc);
-
-	loopcxt_deinit(&lc);
-	return rc;
-}
-
-char *loopdev_get_backing_file(const char *device)
-{
-	struct loopdev_cxt lc;
-	char *res = NULL;
-
-	if (!device)
-		return NULL;
-	if (loopcxt_init(&lc, 0))
-		return NULL;
-	if (loopcxt_set_device(&lc, device) == 0)
-		res = loopcxt_get_backing_file(&lc);
-
-	loopcxt_deinit(&lc);
-	return res;
-}
-
-/*
- * Returns: TRUE/FALSE
- */
-int loopdev_is_used(const char *device, const char *filename,
-		    uint64_t offset, int flags)
-{
-	struct loopdev_cxt lc;
-	struct stat st;
-	int rc = 0;
-
-	if (!device || !filename)
-		return 0;
-
-	rc = loopcxt_init(&lc, 0);
-	if (!rc)
-		rc = loopcxt_set_device(&lc, device);
-	if (rc)
-		return rc;
-
-	rc = !stat(filename, &st);
-	rc = loopcxt_is_used(&lc, rc ? &st : NULL, filename, offset, flags);
-
-	loopcxt_deinit(&lc);
-	return rc;
-}
-
-int loopdev_delete(const char *device)
-{
-	struct loopdev_cxt lc;
-	int rc;
-
-	if (!device)
-		return -EINVAL;
-
-	rc = loopcxt_init(&lc, 0);
-	if (!rc)
-		rc = loopcxt_set_device(&lc, device);
-	if (!rc)
-		rc = loopcxt_delete_device(&lc);
-	loopcxt_deinit(&lc);
-	return rc;
-}
-
-/*
- * Returns: 0 = success, < 0 error, 1 not found
- */
-int loopcxt_find_by_backing_file(struct loopdev_cxt *lc, const char *filename,
-				 uint64_t offset, int flags)
-{
-	int rc, hasst;
-	struct stat st;
-
-	if (!filename)
-		return -EINVAL;
-
-	hasst = !stat(filename, &st);
-
-	rc = loopcxt_init_iterator(lc, LOOPITER_FL_USED);
-	if (rc)
-		return rc;
-
-	while ((rc = loopcxt_next(lc)) == 0) {
-
-		if (loopcxt_is_used(lc, hasst ? &st : NULL,
-					filename, offset, flags))
-			break;
-	}
-
-	loopcxt_deinit_iterator(lc);
-	return rc;
-}
-
-/*
- * Returns allocated string with device name
- */
-char *loopdev_find_by_backing_file(const char *filename, uint64_t offset, int flags)
-{
-	struct loopdev_cxt lc;
-	char *res = NULL;
-
-	if (!filename)
-		return NULL;
-
-	if (loopcxt_init(&lc, 0))
-		return NULL;
-	if (loopcxt_find_by_backing_file(&lc, filename, offset, flags) == 0)
-		res = loopcxt_strdup_device(&lc);
-	loopcxt_deinit(&lc);
-
-	return res;
-}
-
-/*
- * Returns number of loop devices associated with @file, if only one loop
- * device is associeted with the given @filename and @loopdev is not NULL then
- * @loopdev returns name of the device.
- */
-int loopdev_count_by_backing_file(const char *filename, char **loopdev)
-{
-	struct loopdev_cxt lc;
-	int count = 0, rc;
-
-	if (!filename)
-		return -1;
-
-	rc = loopcxt_init(&lc, 0);
-	if (rc)
-		return rc;
-	if (loopcxt_init_iterator(&lc, LOOPITER_FL_USED))
-		return -1;
-
-	while(loopcxt_next(&lc) == 0) {
-		char *backing = loopcxt_get_backing_file(&lc);
-
-		if (!backing || strcmp(backing, filename)) {
-			free(backing);
-			continue;
-		}
-
-		free(backing);
-		if (loopdev && count == 0)
-			*loopdev = loopcxt_strdup_device(&lc);
-		count++;
-	}
-
-	loopcxt_deinit(&lc);
-
-	if (loopdev && count > 1) {
-		free(*loopdev);
-		*loopdev = NULL;
-	}
-	return count;
-}
-
-
-#ifdef TEST_PROGRAM_LOOPDEV
-#include <errno.h>
-#include <err.h>
-
-static void test_loop_info(const char *device, int flags, int debug)
-{
-	struct loopdev_cxt lc;
-	char *p;
-	uint64_t u64;
-
-	if (loopcxt_init(&lc, flags))
-		return;
-	loopcxt_enable_debug(&lc, debug);
-
-	if (loopcxt_set_device(&lc, device))
-		err(EXIT_FAILURE, "failed to set device");
-
-	p = loopcxt_get_backing_file(&lc);
-	printf("\tBACKING FILE: %s\n", p);
-	free(p);
-
-	if (loopcxt_get_offset(&lc, &u64) == 0)
-		printf("\tOFFSET: %jd\n", u64);
-
-	if (loopcxt_get_sizelimit(&lc, &u64) == 0)
-		printf("\tSIZE LIMIT: %jd\n", u64);
-
-	printf("\tAUTOCLEAR: %s\n", loopcxt_is_autoclear(&lc) ? "YES" : "NOT");
-
-	loopcxt_deinit(&lc);
-}
-
-static void test_loop_scan(int flags, int debug)
-{
-	struct loopdev_cxt lc;
-	int rc;
-
-	if (loopcxt_init(&lc, 0))
-		return;
-	loopcxt_enable_debug(&lc, debug);
-
-	if (loopcxt_init_iterator(&lc, flags))
-		err(EXIT_FAILURE, "iterator initlization failed");
-
-	while((rc = loopcxt_next(&lc)) == 0) {
-		const char *device = loopcxt_get_device(&lc);
-
-		if (flags & LOOPITER_FL_USED) {
-			char *backing = loopcxt_get_backing_file(&lc);
-			printf("\t%s: %s\n", device, backing);
-			free(backing);
-		} else
-			printf("\t%s\n", device);
-	}
-
-	if (rc < 0)
-		err(EXIT_FAILURE, "loopdevs scanning failed");
-
-	loopcxt_deinit(&lc);
-}
-
-static int test_loop_setup(const char *filename, const char *device, int debug)
-{
-	struct loopdev_cxt lc;
-	int rc;
-
-	rc = loopcxt_init(&lc, 0);
-	if (rc)
-		return rc;
-	loopcxt_enable_debug(&lc, debug);
-
-	if (device) {
-		rc = loopcxt_set_device(&lc, device);
-		if (rc)
-			err(EXIT_FAILURE, "failed to set device: %s", device);
-	}
-
-	do {
-		if (!device) {
-			rc = loopcxt_find_unused(&lc);
-			if (rc)
-				err(EXIT_FAILURE, "failed to find unused device");
-			printf("Trying to use '%s'\n", loopcxt_get_device(&lc));
-		}
-
-		if (loopcxt_set_backing_file(&lc, filename))
-			err(EXIT_FAILURE, "failed to set backing file");
-
-		rc = loopcxt_setup_device(&lc);
-		if (rc == 0)
-			break;		/* success */
-
-		if (device || rc != -EBUSY)
-			err(EXIT_FAILURE, "failed to setup device for %s",
-					lc.filename);
-
-		printf("device stolen...trying again\n");
-	} while (1);
-
-	loopcxt_deinit(&lc);
-
-	return 0;
-}
-
-int main(int argc, char *argv[])
-{
-	int dbg;
-
-	if (argc < 2)
-		goto usage;
-
-	dbg = getenv("LOOPDEV_DEBUG") == NULL ? 0 : 1;
-
-	if (argc == 3 && strcmp(argv[1], "--info") == 0) {
-		printf("---sysfs & ioctl:---\n");
-		test_loop_info(argv[2], 0, dbg);
-		printf("---sysfs only:---\n");
-		test_loop_info(argv[2], LOOPDEV_FL_NOIOCTL, dbg);
-		printf("---ioctl only:---\n");
-		test_loop_info(argv[2], LOOPDEV_FL_NOSYSFS, dbg);
-
-	} else if (argc == 2 && strcmp(argv[1], "--used") == 0) {
-		printf("---all used devices---\n");
-		test_loop_scan(LOOPITER_FL_USED, dbg);
-
-	} else if (argc == 2 && strcmp(argv[1], "--free") == 0) {
-		printf("---all free devices---\n");
-		test_loop_scan(LOOPITER_FL_FREE, dbg);
-
-	} else if (argc >= 3 && strcmp(argv[1], "--setup") == 0) {
-		test_loop_setup(argv[2], argv[3], dbg);
-
-	} else if (argc == 3 && strcmp(argv[1], "--delete") == 0) {
-		if (loopdev_delete(argv[2]))
-			errx(EXIT_FAILURE, "failed to deinitialize device %s", argv[2]);
-	} else
-		goto usage;
-
-	return EXIT_SUCCESS;
-
-usage:
-	errx(EXIT_FAILURE, "usage: \n"
-			   "  %1$s --info <device>\n"
-			   "  %1$s --free\n"
-			   "  %1$s --used\n"
-			   "  %1$s --setup <filename> [<device>]\n"
-			   "  %1$s --delete\n",
-			   argv[0]);
-}
-
-#endif /* TEST_PROGRAM */