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ext4: journal_path mount options should follow links 

commit e3ea75ee65 upstream.

Before the commit 461c3af045 ("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: 461c3af045 ("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
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Lukas Czerner 2022-10-04 15:58:03 +02:00 committed by Greg Kroah-Hartman
parent 5e1d519af5
commit 15adfbb2d1
4 changed files with 5 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
Documentation/filesystems/mount_api.rst
View File

@ -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

2
fs/ext4/super.c
View File

@ -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");

3
fs/fs_parser.c
View File

@ -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;

1
include/linux/fs_parser.h
View File

@ -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);