linux-ext4 - [PATCH] ext4: journal_path mount options should follow links

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Date:   Tue,  4 Oct 2022 15:58:03 +0200
From:   Lukas Czerner <lczerner@...hat.com>
To:     linux-ext4@...r.kernel.org
Cc:     tytso@....edu, linux-fsdevel@...r.kernel.org
Subject: [PATCH] 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@...hat.com>
---
 Documentation/filesystems/mount_api.rst | 1 +
 fs/ext4/super.c                         | 2 +-
 fs/fs_parser.c                          | 3 ++-
 include/linux/fs_parser.h               | 1 +
 4 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/Documentation/filesystems/mount_api.rst b/Documentation/filesystems/mount_api.rst
index eb358a00be27..1d16787a00e9 100644
--- 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 9a66abcca1a8..4c1b3972d53f 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -2271,7 +2271,7 @@ 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 ed40ce5742fd..edb3712dcfa5 100644
--- 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 f103c91139d4..01542c4b87a2 100644
--- 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);
-- 
2.37.3