lsblk: move mount stuff to lsblk-mnt.c

Signed-off-by: Karel Zak <kzak@redhat.com>

1 files changed, 111 insertions, 0 deletions

diff --git a/misc-utils/lsblk-mnt.c b/misc-utils/lsblk-mnt.c
new file mode 100644
index 000000000..4e1e3287b
--- /dev/null
+++ b/misc-utils/lsblk-mnt.c
@@ -0,0 +1,111 @@
+#include "c.h"
+#include "pathnames.h"
+#include "xalloc.h"
+#include "nls.h"
+
+#include <libmount.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 int is_active_swap(const char *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) != NULL;
+}
+
+char *get_device_mountpoint(struct blkdev_cxt *cxt)
+{
+	struct libmnt_fs *fs;
+	const char *fsroot;
+
+	assert(cxt);
+	assert(cxt->filename);
+
+	if (cxt->is_mounted)
+		return cxt->mountpoint;
+
+	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);
+		}
+	}
+
+	/* Note that maj:min in /proc/self/mountinfo does not have to match with
+	 * devno as returned by stat(), so we have to try devname too
+	 */
+	fs = mnt_table_find_devno(mtab, makedev(cxt->maj, cxt->min), MNT_ITER_BACKWARD);
+	if (!fs)
+		fs = mnt_table_find_srcpath(mtab, cxt->filename, MNT_ITER_BACKWARD);
+	if (!fs) {
+		cxt->mountpoint = is_active_swap(cxt->filename) ? xstrdup("[SWAP]") : NULL;
+		cxt->is_mounted = 1;
+		return cxt->mountpoint;
+	}
+
+	/* found */
+	fsroot = mnt_fs_get_root(fs);
+	if (fsroot && strcmp(fsroot, "/") != 0) {
+		/* hmm.. we found bind mount or btrfs subvolume, let's try to
+		 * get real FS root mountpoint */
+		struct libmnt_fs *rfs;
+		struct libmnt_iter *itr = mnt_new_iter(MNT_ITER_BACKWARD);
+
+		mnt_table_set_iter(mtab, itr, fs);
+		while (mnt_table_next_fs(mtab, itr, &rfs) == 0) {
+			fsroot = mnt_fs_get_root(rfs);
+			if ((!fsroot || strcmp(fsroot, "/") == 0)
+			    && mnt_fs_match_source(rfs, cxt->filename, mntcache)) {
+				fs = rfs;
+				break;
+			}
+		}
+		mnt_free_iter(itr);
+	}
+
+	DBG(DEV, ul_debugobj(cxt, "mountpoint: %s", mnt_fs_get_target(fs)));
+	cxt->mountpoint = xstrdup(mnt_fs_get_target(fs));
+	cxt->is_mounted = 1;
+	return cxt->mountpoint;
+}