ext4: journal_path mount options should follow links

Before the commit 461c3af045d3 ("ext4: Change handle_mount_opt() to use
fs_parameter") ext4 mount option journal_path did follow links in the
provided path.

Bring this behavior back by allowing to pass pathwalk flags to
fs_lookup_param().

Fixes: 461c3af045d3 ("ext4: Change handle_mount_opt() to use fs_parameter")
Signed-off-by: Lukas Czerner <lczerner@redhat.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Link: https://lore.kernel.org/r/20221004135803.32283-1-lczerner@redhat.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@kernel.org

diff --git a/Documentation/filesystems/mount_api.rst b/Documentation/filesystems/mount_api.rst
index eb358a0..1d16787 100644 (file)
--- a/Documentation/filesystems/mount_api.rst
+++ b/Documentation/filesystems/mount_api.rst
@@ -814,6 +814,7 @@ process the parameters it is given.
        int fs_lookup_param(struct fs_context *fc,
                           struct fs_parameter *value,
                           bool want_bdev,
+                          unsigned int flags,
                           struct path *_path);
 
      This takes a parameter that carries a string or filename type and attempts

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 4749b30..0f71542 100644 (file)
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -2247,7 +2247,7 @@ static int ext4_parse_param(struct fs_context *fc, struct fs_parameter *param)
                        return -EINVAL;
                }
 
-               error = fs_lookup_param(fc, param, 1, &path);
+               error = fs_lookup_param(fc, param, 1, LOOKUP_FOLLOW, &path);
                if (error) {
                        ext4_msg(NULL, KERN_ERR, "error: could not find "
                                 "journal device path");

diff --git a/fs/fs_parser.c b/fs/fs_parser.c
index ed40ce5..edb3712 100644 (file)
--- a/fs/fs_parser.c
+++ b/fs/fs_parser.c
@@ -138,15 +138,16 @@ EXPORT_SYMBOL(__fs_parse);
  * @fc: The filesystem context to log errors through.
  * @param: The parameter.
  * @want_bdev: T if want a blockdev
+ * @flags: Pathwalk flags passed to filename_lookup()
  * @_path: The result of the lookup
  */
 int fs_lookup_param(struct fs_context *fc,
                    struct fs_parameter *param,
                    bool want_bdev,
+                   unsigned int flags,
                    struct path *_path)
 {
        struct filename *f;
-       unsigned int flags = 0;
        bool put_f;
        int ret;
 

diff --git a/include/linux/fs_parser.h b/include/linux/fs_parser.h
index f103c91..01542c4 100644 (file)
--- a/include/linux/fs_parser.h
+++ b/include/linux/fs_parser.h
@@ -76,6 +76,7 @@ static inline int fs_parse(struct fs_context *fc,
 extern int fs_lookup_param(struct fs_context *fc,
                           struct fs_parameter *param,
                           bool want_bdev,
+                          unsigned int flags,
                           struct path *_path);
 
 extern int lookup_constant(const struct constant_table tbl[], const char *name, int not_found);