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btrfs-progs: fix find_mount_root() to handle duplicated mount point correctly 

Original find_mount_root() will use the first mount point match and
return it.
It was OK until the following commit, which will also check the fstype:
de22c28ef3 btrfs-progs: Check fstype in find_mount_root()

With fstype check, we should check the last match, not only the first
one.
Or the following mount will not pass the find_mount_root():
/dev/sdc on /mnt/test type ext4 (rw,relatime,data=ordered)
/dev/sdb on /mnt/test type btrfs (rw,relatime,space_cache)

This patch will use the last match to do the fstype check.

Reported-by: Remco Hosman <remco@yerf-it.nl>
Signed-off-by: Remco Hosman <remco@yerf-it.nl>
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Reviewed-by: Omar Sandoval <osandov@osandov.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
This commit is contained in:
Qu Wenruo 2014-09-04 10:27:48 +08:00 committed by David Sterba
parent 24f5a651d9
commit 6a47725a6f
1 changed files with 2 additions and 2 deletions
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4
utils.c
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@ -2359,8 +2359,8 @@ int find_mount_root(const char *path, char **mount_root)
while ((ent = getmntent(mnttab))) {
len = strlen(ent->mnt_dir);
if (strncmp(ent->mnt_dir, path, len) == 0) {
/* match found */
if (longest_matchlen < len) {
/* match found and use the latest match */
if (longest_matchlen <= len) {
free(longest_match);
longest_matchlen = len;
longest_match = strdup(ent->mnt_dir);