btrfs-progs: Allow debug-tree to be executed on regular file.

The commit 1bad43fbe002 ("btrfs-progs: refine btrfs-debug-tree error
prompt when a mount point given")
add judgement on btrfs-debug-tree to restrict only block device to be
executed on, but the command can also be used on regular file, so add
regular file support for the judgement.

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.cz>

1 files changed, 17 insertions, 4 deletions

diff --git a/utils.c b/utils.c
index effacd10..868b15e4 100644
--- a/utils.c
+++ b/utils.c
@@ -854,13 +854,23 @@ int is_mount_point(const char *path)
 	return ret;
 }
 
+static int is_reg_file(const char *path)
+{
+	struct stat statbuf;
+
+	if (stat(path, &statbuf) < 0)
+		return -errno;
+	return S_ISREG(statbuf.st_mode);
+}
+
 /*
  * This function checks if the given input parameter is
  * an uuid or a path
- * return -1: some error in the given input
- * return 0: unknow input
- * return 1: given input is uuid
- * return 2: given input is path
+ * return <0 : some error in the given input
+ * return BTRFS_ARG_UNKNOWN:	unknown input
+ * return BTRFS_ARG_UUID:	given input is uuid
+ * return BTRFS_ARG_MNTPOINT:	given input is path
+ * return BTRFS_ARG_REG:	given input is regular file
  */
 int check_arg_type(const char *input)
 {
@@ -877,6 +887,9 @@ int check_arg_type(const char *input)
 		if (is_mount_point(path) == 1)
 			return BTRFS_ARG_MNTPOINT;
 
+		if (is_reg_file(path))
+			return BTRFS_ARG_REG;
+
 		return BTRFS_ARG_UNKNOWN;
 	}