btrfs-progs: inspect-internal rootid: Allow a file to be specified

Commit Message

Misono Tomohiro Sept. 4, 2017, 5:05 a.m. UTC

Since cmd_inspect_rootid() calls btrfs_open_dir(), it rejects a file to
be spcified. But as the document says, a file should be supported.

This patch introduces btrfs_open_file_or_dir(), which is a counterpart
of btrfs_open_dir(), to safely check and open btrfs file or directory.
The original btrfs_open_dir() codes are moved to btrfs_open() and shared
by both function.

Signed-off-by: Tomohiro Misono <[e-mail]>
---
 cmds-inspect.c |  2 +-
 utils.c        | 16 +++++++++++++---
 utils.h        |  2 ++
 3 files changed, 16 insertions(+), 4 deletions(-)

Comments

David Sterba Sept. 4, 2017, 4:09 p.m. UTC | #1

On Mon, Sep 04, 2017 at 02:05:34PM +0900, Misono, Tomohiro wrote:
> Since cmd_inspect_rootid() calls btrfs_open_dir(), it rejects a file to
> be spcified. But as the document says, a file should be supported.
> 
> This patch introduces btrfs_open_file_or_dir(), which is a counterpart
> of btrfs_open_dir(), to safely check and open btrfs file or directory.
> The original btrfs_open_dir() codes are moved to btrfs_open() and shared
> by both function.
> 
> Signed-off-by: Tomohiro Misono <[e-mail]>

Applied, thanks. Can you please send a testcase for that?
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Patch

diff --git a/cmds-inspect.c b/cmds-inspect.c
index d1a3a0e..885f3ab 100644
--- a/cmds-inspect.c
+++ b/cmds-inspect.c
@@ -318,7 +318,7 @@  static int cmd_inspect_rootid(int argc, char **argv)
 	if (check_argc_exact(argc - optind, 1))
 		usage(cmd_inspect_rootid_usage);
 
-	fd = btrfs_open_dir(argv[optind], &dirstream, 1);
+	fd = btrfs_open_file_or_dir(argv[optind], &dirstream, 1);
 	if (fd < 0) {
 		ret = -ENOENT;
 		goto out;
diff --git a/utils.c b/utils.c
index bb04913..9db39eb 100644
--- a/utils.c
+++ b/utils.c
@@ -568,9 +568,9 @@  int open_path_or_dev_mnt(const char *path, DIR **dirstream, int verbose)
 /*
  * Do the following checks before calling open_file_or_dir():
  * 1: path is in a btrfs filesystem
- * 2: path is a directory
+ * 2: path is a directory if dir_only is 1
  */
-int btrfs_open_dir(const char *path, DIR **dirstream, int verbose)
+int btrfs_open(const char *path, DIR **dirstream, int verbose, int dir_only)
 {
 	struct statfs stfs;
 	struct stat st;
@@ -593,7 +593,7 @@  int btrfs_open_dir(const char *path, DIR **dirstream, int verbose)
 		return -1;
 	}
 
-	if (!S_ISDIR(st.st_mode)) {
+	if (dir_only && !S_ISDIR(st.st_mode)) {
 		error_on(verbose, "not a directory: %s", path);
 		return -3;
 	}
@@ -607,6 +607,16 @@  int btrfs_open_dir(const char *path, DIR **dirstream, int verbose)
 	return ret;
 }
 
+int btrfs_open_dir(const char *path, DIR **dirstream, int verbose)
+{
+	return btrfs_open(path, dirstream, verbose, 1);
+}
+
+int btrfs_open_file_or_dir(const char *path, DIR **dirstream, int verbose)
+{
+	return btrfs_open(path, dirstream, verbose, 0);
+}
+
 /* checks if a device is a loop device */
 static int is_loop_device (const char* device) {
 	struct stat statbuf;
diff --git a/utils.h b/utils.h
index 091f8fa..d28a05a 100644
--- a/utils.h
+++ b/utils.h
@@ -108,7 +108,9 @@  int is_block_device(const char *file);
 int is_mount_point(const char *file);
 int check_arg_type(const char *input);
 int open_path_or_dev_mnt(const char *path, DIR **dirstream, int verbose);
+int btrfs_open(const char *path, DIR **dirstream, int verbose, int dir_only);
 int btrfs_open_dir(const char *path, DIR **dirstream, int verbose);
+int btrfs_open_file_or_dir(const char *path, DIR **dirstream, int verbose);
 u64 btrfs_device_size(int fd, struct stat *st);
 /* Helper to always get proper size of the destination string */
 #define strncpy_null(dest, src) __strncpy_null(dest, src, sizeof(dest))