File util-linux-libmount-btrfs-target-resolving.patch of Package util-linux.4136

From 7dca35b2bebe66a2b925fcd6709d7712ed470277 Mon Sep 17 00:00:00 2001
From: Karel Zak <kzak@redhat.com>
Date: Mon, 1 Feb 2016 12:36:07 +0100
Subject: [PATCH] libmount: fix target resolving for btrfs stuff

and make the code more verbose.

Signed-off-by: Karel Zak <kzak@redhat.com>
---
 libmount/src/tab.c | 23 ++++++++++++++---------
 1 file changed, 14 insertions(+), 9 deletions(-)

Index: util-linux-2.25/libmount/src/tab.c
===================================================================
--- util-linux-2.25.orig/libmount/src/tab.c
+++ util-linux-2.25/libmount/src/tab.c
@@ -1322,7 +1322,6 @@ struct libmnt_fs *mnt_table_get_fs_root(
 			if (fs)
 				mnt = mnt_fs_get_target(fs);
 		}
-
 		if (mnt)
 			root = remove_mountpoint_from_path(src, mnt);
 
@@ -1378,10 +1377,10 @@ struct libmnt_fs *mnt_table_get_fs_root(
 		char *vol = NULL, *p;
 		size_t sz, volsz = 0;
 
-		DBG(BTRFS, ul_debug("lookup for FS root"));
+		DBG(BTRFS, ul_debug("lookup for btrfs FS root"));
 
-		if (mnt_fs_get_option(fs, "subvolid", &vol, &volsz)) {
-			if (mnt_fs_get_option(fs, "subvol", &vol, &volsz)) {
+		if (mnt_fs_get_option(fs, "subvolid", &vol, &volsz) != 0) {
+			if (mnt_fs_get_option(fs, "subvol", &vol, &volsz) != 0) {
 				/* If fstab entry does not contain "subvol", we
 				 * have to check, whether btrfs has default
 				 * subvolume defined.
@@ -1391,6 +1390,8 @@ struct libmnt_fs *mnt_table_get_fs_root(
 				struct libmnt_fs *f;
 				char default_id_str[sizeof(stringify_value(UINT64_MAX))];
 
+				DBG(BTRFS, ul_debug(" subvolid/subvol not set, checking default"));
+
 				default_id = btrfs_get_default_subvol_id(mnt_fs_get_target(fs));
 				if (default_id == UINT64_MAX)
 					goto dflt;
@@ -1402,14 +1403,14 @@ struct libmnt_fs *mnt_table_get_fs_root(
 				 * kernels, there is no reasonable way to detect
 				 * which subvolume was mounted.
 				 */
-				target = mnt_resolve_spec(mnt_fs_get_target(fs), tb->cache);
+				target = mnt_resolve_target(mnt_fs_get_target(fs), tb->cache);
 				if (!target)
 					goto err;
 
 				snprintf(default_id_str, sizeof(default_id_str), "%llu",
 						(unsigned long long int) default_id);
 
-				DBG(BTRFS, ul_debug("target=%s default subvolid=%s", target, default_id_str));
+				DBG(BTRFS, ul_debug(" tring target=%s default subvolid=%s", target, default_id_str));
 				f = mnt_table_find_target_with_option(tb, target,
 							"subvolid", default_id_str,
 							MNT_ITER_BACKWARD);
@@ -1425,21 +1426,23 @@ struct libmnt_fs *mnt_table_get_fs_root(
 				if (mnt_fs_get_option(f, "subvol", &vol, &volsz))
 					goto dflt;
 			} else
-				DBG(BTRFS, ul_debug("setting FS root: btrfs subvol"));
+				DBG(BTRFS, ul_debug(" found subvol=%s", vol));
 		} else {
 			char *target;
 			struct libmnt_fs *f;
 			char subvolidstr[sizeof(stringify_value(UINT64_MAX))];
 
+			DBG(BTRFS, ul_debug(" found subvolid=%s, checking", vol));
+
 			assert (volsz + 1 < sizeof(stringify_value(UINT64_MAX)));
 			memcpy(subvolidstr, vol, volsz);
 			subvolidstr[volsz] = '\0';
 
-			target = mnt_resolve_spec(mnt_fs_get_target(fs), tb->cache);
+			target = mnt_resolve_target(mnt_fs_get_target(fs), tb->cache);
 			if (!target)
 				goto err;
 
-			DBG(BTRFS, ul_debug("target=%s subvolid=%s", target, subvolidstr));
+			DBG(BTRFS, ul_debug(" tring target=%s subvolid=%s", target, subvolidstr));
 			f = mnt_table_find_target_with_option(tb, target,
 						"subvolid", subvolidstr,
 						MNT_ITER_BACKWARD);
@@ -1456,6 +1459,8 @@ struct libmnt_fs *mnt_table_get_fs_root(
 			 */
 			if (mnt_fs_get_option(f, "subvol", &vol, &volsz))
 				goto dflt;
+
+			DBG(BTRFS, ul_debug(" found subvol=%s", vol));
 		}
 
 		sz = volsz;