Btrfs-progs: Use /proc/mounts instead of /etc/mtab

/etc/mtab is not working correctly in situations where multiple
mount namespaces are used. Use /proc/mounts instead like the
rest of the code is doing it.

Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de>

diff --git a/cmds-send.c b/cmds-send.c
index b2a340e..5a7183d 100644 (file)
--- a/cmds-send.c
+++ b/cmds-send.c
@@ -70,7 +70,7 @@ int find_mount_root(const char *path, char **mount_root)
                return -errno;
        close(fd);
 
-       mnttab = fopen("/etc/mtab", "r");
+       mnttab = fopen("/proc/mounts", "r");
        while ((ent = getmntent(mnttab))) {
                len = strlen(ent->mnt_dir);
                if (strncmp(ent->mnt_dir, path, len) == 0) {