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Diffstat (limited to 'src/utils/lib/loopdev.c')
-rw-r--r--src/utils/lib/loopdev.c91
1 files changed, 64 insertions, 27 deletions
diff --git a/src/utils/lib/loopdev.c b/src/utils/lib/loopdev.c
index 194daf9..2fb46e2 100644
--- a/src/utils/lib/loopdev.c
+++ b/src/utils/lib/loopdev.c
@@ -41,6 +41,7 @@
#include "canonicalize.h"
#include "blkdev.h"
#include "debug.h"
+#include "fileutils.h"
/*
* Debug stuff (based on include/debug.h)
@@ -542,7 +543,7 @@ static int loopcxt_next_from_sysfs(struct loopdev_cxt *lc)
if (strcmp(d->d_name, ".") == 0
|| strcmp(d->d_name, "..") == 0
- || strncmp(d->d_name, "xloop", 4) != 0)
+ || strncmp(d->d_name, "xloop", 5) != 0)
continue;
snprintf(name, sizeof(name), "%s/xloop/backing_file", d->d_name);
@@ -634,14 +635,30 @@ done:
int is_loopdev(const char *device)
{
struct stat st;
+ int rc = 0;
- if (device && stat(device, &st) == 0 &&
- S_ISBLK(st.st_mode) &&
- major(st.st_rdev) == LOOPDEV_MAJOR)
- return 1;
+ if (!device || stat(device, &st) != 0 || !S_ISBLK(st.st_mode))
+ rc = 0;
+ else if (major(st.st_rdev) == LOOPDEV_MAJOR)
+ rc = 1;
+ else if (sysfs_devno_is_wholedisk(st.st_rdev)) {
+ /* It's possible that kernel creates a device with a different
+ * major number ... check by /sys it's really xloop device.
+ */
+ char name[PATH_MAX], *cn, *p = NULL;
+
+ snprintf(name, sizeof(name), _PATH_SYS_DEVBLOCK "/%d:%d",
+ major(st.st_rdev), minor(st.st_rdev));
+ cn = canonicalize_path(name);
+ if (cn)
+ p = stripoff_last_component(cn);
+ rc = p && startswith(p, "xloop");
+ free(cn);
+ }
- errno = ENODEV;
- return 0;
+ if (rc == 0)
+ errno = ENODEV;
+ return rc;
}
/*
@@ -668,12 +685,12 @@ struct loop_info64 *loopcxt_get_info(struct loopdev_cxt *lc)
if (ioctl(fd, LOOP_GET_STATUS64, &lc->config.info) == 0) {
lc->has_info = 1;
lc->info_failed = 0;
- DBG(CXT, ul_debugobj(lc, "reading loop_info64 OK"));
+ DBG(CXT, ul_debugobj(lc, "reading xloop_info64 OK"));
return &lc->config.info;
}
lc->info_failed = 1;
- DBG(CXT, ul_debugobj(lc, "reading loop_info64 FAILED"));
+ DBG(CXT, ul_debugobj(lc, "reading xloop_info64 FAILED"));
return NULL;
}
@@ -1302,7 +1319,7 @@ static int loopcxt_check_size(struct loopdev_cxt *lc, int file_fd)
}
if (blkdev_get_size(dev_fd, (unsigned long long *) &size)) {
- DBG(CXT, ul_debugobj(lc, "failed to determine loopdev size"));
+ DBG(CXT, ul_debugobj(lc, "failed to determine xloopdev size"));
return -errno;
}
@@ -1313,7 +1330,7 @@ static int loopcxt_check_size(struct loopdev_cxt *lc, int file_fd)
}
if (expected_size != size) {
- DBG(CXT, ul_debugobj(lc, "warning: loopdev and expected "
+ DBG(CXT, ul_debugobj(lc, "warning: xloopdev and expected "
"size mismatch (%ju/%ju)",
size, expected_size));
@@ -1329,7 +1346,7 @@ static int loopcxt_check_size(struct loopdev_cxt *lc, int file_fd)
if (expected_size != size) {
errno = ERANGE;
- DBG(CXT, ul_debugobj(lc, "failed to set loopdev size, "
+ DBG(CXT, ul_debugobj(lc, "failed to set xloopdev size, "
"size: %ju, expected: %ju",
size, expected_size));
return -errno;
@@ -1429,8 +1446,8 @@ int loopcxt_setup_device(struct loopdev_cxt *lc)
if (ioctl(dev_fd, LOOP_CONFIGURE, &lc->config) < 0) {
rc = -errno;
errsv = errno;
- if (errno != EINVAL) {
- DBG(SETUP, ul_debugobj(lc, "LOOP_CONFIGURE failed: %m"));
+ if (errno != EINVAL && errno != ENOTTY) {
+ DBG(SETUP, ul_debugobj(lc, "XLOOP_CONFIGURE failed: %m"));
goto err;
}
fallback = 1;
@@ -1440,7 +1457,7 @@ int loopcxt_setup_device(struct loopdev_cxt *lc)
errsv = -rc;
goto err;
}
- DBG(SETUP, ul_debugobj(lc, "LOOP_CONFIGURE: OK"));
+ DBG(SETUP, ul_debugobj(lc, "XLOOP_CONFIGURE: OK"));
}
/*
@@ -1451,11 +1468,11 @@ int loopcxt_setup_device(struct loopdev_cxt *lc)
if (ioctl(dev_fd, LOOP_SET_FD, file_fd) < 0) {
rc = -errno;
errsv = errno;
- DBG(SETUP, ul_debugobj(lc, "LOOP_SET_FD failed: %m"));
+ DBG(SETUP, ul_debugobj(lc, "XLOOP_SET_FD failed: %m"));
goto err;
}
- DBG(SETUP, ul_debugobj(lc, "LOOP_SET_FD: OK"));
+ DBG(SETUP, ul_debugobj(lc, "XLOOP_SET_FD: OK"));
if (lc->blocksize > 0
&& (rc = loopcxt_ioctl_blocksize(lc, lc->blocksize)) < 0) {
@@ -1473,11 +1490,11 @@ int loopcxt_setup_device(struct loopdev_cxt *lc)
if (err) {
rc = -errno;
errsv = errno;
- DBG(SETUP, ul_debugobj(lc, "LOOP_SET_STATUS64 failed: %m"));
+ DBG(SETUP, ul_debugobj(lc, "XLOOP_SET_STATUS64 failed: %m"));
goto err;
}
- DBG(SETUP, ul_debugobj(lc, "LOOP_SET_STATUS64: OK"));
+ DBG(SETUP, ul_debugobj(lc, "XLOOP_SET_STATUS64: OK"));
}
if ((rc = loopcxt_check_size(lc, file_fd)))
@@ -1535,11 +1552,11 @@ int loopcxt_ioctl_status(struct loopdev_cxt *lc)
} while (again);
if (err) {
rc = -errno;
- DBG(SETUP, ul_debugobj(lc, "LOOP_SET_STATUS64 failed: %m"));
+ DBG(SETUP, ul_debugobj(lc, "XLOOP_SET_STATUS64 failed: %m"));
return rc;
}
- DBG(SETUP, ul_debugobj(lc, "LOOP_SET_STATUS64: OK"));
+ DBG(SETUP, ul_debugobj(lc, "XLOOP_SET_STATUS64: OK"));
return 0;
}
@@ -1553,7 +1570,7 @@ int loopcxt_ioctl_capacity(struct loopdev_cxt *lc)
/* Kernels prior to v2.6.30 don't support this ioctl */
if (ioctl(fd, LOOP_SET_CAPACITY, 0) < 0) {
int rc = -errno;
- DBG(CXT, ul_debugobj(lc, "LOOP_SET_CAPACITY failed: %m"));
+ DBG(CXT, ul_debugobj(lc, "XLOOP_SET_CAPACITY failed: %m"));
return rc;
}
@@ -1571,7 +1588,7 @@ int loopcxt_ioctl_dio(struct loopdev_cxt *lc, unsigned long use_dio)
/* Kernels prior to v4.4 don't support this ioctl */
if (ioctl(fd, LOOP_SET_DIRECT_IO, use_dio) < 0) {
int rc = -errno;
- DBG(CXT, ul_debugobj(lc, "LOOP_SET_DIRECT_IO failed: %m"));
+ DBG(CXT, ul_debugobj(lc, "XLOOP_SET_DIRECT_IO failed: %m"));
return rc;
}
@@ -1593,7 +1610,7 @@ int loopcxt_ioctl_blocksize(struct loopdev_cxt *lc, uint64_t blocksize)
/* Kernels prior to v4.14 don't support this ioctl */
if (ioctl(fd, LOOP_SET_BLOCK_SIZE, (unsigned long) blocksize) < 0) {
int rc = -errno;
- DBG(CXT, ul_debugobj(lc, "LOOP_SET_BLOCK_SIZE failed: %m"));
+ DBG(CXT, ul_debugobj(lc, "XLOOP_SET_BLOCK_SIZE failed: %m"));
return rc;
}
@@ -1609,7 +1626,7 @@ int loopcxt_delete_device(struct loopdev_cxt *lc)
return -EINVAL;
if (ioctl(fd, LOOP_CLR_FD, 0) < 0) {
- DBG(CXT, ul_debugobj(lc, "LOOP_CLR_FD failed: %m"));
+ DBG(CXT, ul_debugobj(lc, "XLOOP_CLR_FD failed: %m"));
return -errno;
}
@@ -1862,7 +1879,7 @@ int loopcxt_find_overlap(struct loopdev_cxt *lc, const char *filename,
/* full match */
if (lc_sizelimit == sizelimit && lc_offset == offset) {
- DBG(CXT, ul_debugobj(lc, "overlapping loop device %s (full match)",
+ DBG(CXT, ul_debugobj(lc, "overlapping xloop device %s (full match)",
loopcxt_get_device(lc)));
rc = 2;
goto found;
@@ -1874,7 +1891,7 @@ int loopcxt_find_overlap(struct loopdev_cxt *lc, const char *filename,
if (sizelimit != 0 && offset + sizelimit <= lc_offset)
continue;
- DBG(CXT, ul_debugobj(lc, "overlapping loop device %s",
+ DBG(CXT, ul_debugobj(lc, "overlapping xloop device %s",
loopcxt_get_device(lc)));
rc = 1;
goto found;
@@ -1949,3 +1966,23 @@ int loopdev_count_by_backing_file(const char *filename, char **loopdev)
}
return count;
}
+
+#ifdef TEST_PROGRAM_LOOPDEV
+int main(int argc, char *argv[])
+{
+ if (argc < 2)
+ goto usage;
+
+ if (strcmp(argv[1], "--is-loopdev") == 0 && argc == 3)
+ printf("%s: %s\n", argv[2], is_loopdev(argv[2]) ? "OK" : "FAIL");
+ else
+ goto usage;
+
+ return EXIT_SUCCESS;
+usage:
+ fprintf(stderr, "usage: %1$s --is-loopdev <dev>\n",
+ program_invocation_short_name);
+ return EXIT_FAILURE;
+}
+#endif
+
generated by cgit v1.2.3-55-g7522 (git 2.39.0) at 2024-05-17 14:20:51 +0200