summaryrefslogtreecommitdiffstats
path: root/misc-utils/lsblk-mnt.c
diff options
context:
space:
mode:
authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-14 19:10:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-14 19:10:49 +0000
commitcfe5e3905201349e9cf3f95d52ff4bd100bde37d (patch)
treed0baf160cbee3195249d095f85e52d20c21acf02 /misc-utils/lsblk-mnt.c
parentInitial commit. (diff)
downloadutil-linux-cfe5e3905201349e9cf3f95d52ff4bd100bde37d.tar.xz
util-linux-cfe5e3905201349e9cf3f95d52ff4bd100bde37d.zip
Adding upstream version 2.39.3.upstream/2.39.3
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'misc-utils/lsblk-mnt.c')
-rw-r--r--misc-utils/lsblk-mnt.c181
1 files changed, 181 insertions, 0 deletions
diff --git a/misc-utils/lsblk-mnt.c b/misc-utils/lsblk-mnt.c
new file mode 100644
index 0000000..9f6ba0d
--- /dev/null
+++ b/misc-utils/lsblk-mnt.c
@@ -0,0 +1,181 @@
+#include "c.h"
+#include "pathnames.h"
+#include "xalloc.h"
+#include "nls.h"
+
+#include "lsblk.h"
+
+static struct libmnt_table *mtab, *swaps;
+static struct libmnt_cache *mntcache;
+
+static int table_parser_errcb(struct libmnt_table *tb __attribute__((__unused__)),
+ const char *filename, int line)
+{
+ if (filename)
+ warnx(_("%s: parse error at line %d -- ignored"), filename, line);
+ return 1;
+}
+
+static struct libmnt_fs *get_active_swap(const char *filename)
+{
+ assert(filename);
+
+ if (!swaps) {
+ swaps = mnt_new_table();
+ if (!swaps)
+ return 0;
+ if (!mntcache)
+ mntcache = mnt_new_cache();
+
+ mnt_table_set_parser_errcb(swaps, table_parser_errcb);
+ mnt_table_set_cache(swaps, mntcache);
+
+ if (!lsblk->sysroot)
+ mnt_table_parse_swaps(swaps, NULL);
+ else {
+ char buf[PATH_MAX];
+ snprintf(buf, sizeof(buf), "%s" _PATH_PROC_SWAPS, lsblk->sysroot);
+ mnt_table_parse_swaps(swaps, buf);
+ }
+ }
+
+ return mnt_table_find_srcpath(swaps, filename, MNT_ITER_BACKWARD);
+}
+
+void lsblk_device_free_filesystems(struct lsblk_device *dev)
+{
+ if (!dev)
+ return;
+
+ free(dev->fss);
+
+ dev->fss = NULL;
+ dev->nfss = 0;
+ dev->is_mounted = 0;
+ dev->is_swap = 0;
+}
+
+static void add_filesystem(struct lsblk_device *dev, struct libmnt_fs *fs)
+{
+ assert(dev);
+ assert(fs);
+
+ dev->fss = xrealloc(dev->fss, (dev->nfss + 1)
+ * sizeof(struct libmnt_fs *));
+ dev->fss[dev->nfss] = fs;
+ dev->nfss++;
+ dev->is_mounted = 1;
+}
+
+struct libmnt_fs **lsblk_device_get_filesystems(struct lsblk_device *dev, size_t *n)
+{
+ struct libmnt_fs *fs;
+ struct libmnt_iter *itr = NULL;
+ dev_t devno;
+
+ assert(dev);
+ assert(dev->filename);
+
+ if (dev->is_mounted)
+ goto done;
+
+ lsblk_device_free_filesystems(dev); /* reset */
+
+ if (!mtab) {
+ mtab = mnt_new_table();
+ if (!mtab)
+ return NULL;
+ if (!mntcache)
+ mntcache = mnt_new_cache();
+
+ mnt_table_set_parser_errcb(mtab, table_parser_errcb);
+ mnt_table_set_cache(mtab, mntcache);
+
+ if (!lsblk->sysroot)
+ mnt_table_parse_mtab(mtab, NULL);
+ else {
+ char buf[PATH_MAX];
+ snprintf(buf, sizeof(buf), "%s" _PATH_PROC_MOUNTINFO, lsblk->sysroot);
+ mnt_table_parse_mtab(mtab, buf);
+ }
+ }
+
+ devno = makedev(dev->maj, dev->min);
+
+ /* All mounpoint where is used devno or device name
+ */
+ itr = mnt_new_iter(MNT_ITER_BACKWARD);
+ while (mnt_table_next_fs(mtab, itr, &fs) == 0) {
+ if (mnt_fs_get_devno(fs) != devno &&
+ !mnt_fs_streq_srcpath(fs, dev->filename))
+ continue;
+ add_filesystem(dev, fs);
+ }
+
+ /* Try mnt_table_find_srcpath() which also canonicalizes patches, etc.
+ */
+ if (!dev->nfss) {
+ fs = get_active_swap(dev->filename);
+ if (!fs) {
+ fs = mnt_table_find_srcpath(mtab, dev->filename, MNT_ITER_BACKWARD);
+ if (fs)
+ dev->is_swap = 1;
+ }
+ if (fs)
+ add_filesystem(dev, fs);
+ }
+
+done:
+ mnt_free_iter(itr);
+ if (n)
+ *n = dev->nfss;
+ return dev->fss;
+}
+
+/* Returns mounpoint where the device is mounted. If the device is used for
+ * more filesystems (subvolumes, ...) than returns the "best" one.
+ */
+const char *lsblk_device_get_mountpoint(struct lsblk_device *dev)
+{
+ struct libmnt_fs *fs = NULL;
+ const char *root;
+
+ lsblk_device_get_filesystems(dev, NULL);
+ if (!dev->nfss)
+ return NULL;
+
+ /* lsblk_device_get_filesystems() scans mountinfo/swaps in backward
+ * order. It means the first in fss[] is the last mounted FS. Let's
+ * keep it as default */
+ fs = dev->fss[0];
+ root = mnt_fs_get_root(fs);
+
+ if (root && strcmp(root, "/") != 0) {
+ /* FS is subvolume (or subdirectory bind-mount). Try to get
+ * FS with "/" root */
+ size_t i;
+
+ for (i = 1; i < dev->nfss; i++) {
+ root = mnt_fs_get_root(dev->fss[i]);
+ if (!root || strcmp(root, "/") == 0) {
+ fs = dev->fss[i];
+ break;
+ }
+ }
+ }
+ if (mnt_fs_is_swaparea(fs))
+ return "[SWAP]";
+ return mnt_fs_get_target(fs);
+}
+
+void lsblk_mnt_init(void)
+{
+ mnt_init_debug(0);
+}
+
+void lsblk_mnt_deinit(void)
+{
+ mnt_unref_table(mtab);
+ mnt_unref_table(swaps);
+ mnt_unref_cache(mntcache);
+}