diff options
| author | Toshi Kani <[email protected]> | 2016-05-10 10:23:54 -0600 |
|---|---|---|
| committer | Vishal Verma <[email protected]> | 2016-05-17 00:44:11 -0600 |
| commit | 87eefeb4e80b1526be83e670a08d059a003b7d0e (patch) | |
| tree | a88b87b6b1b30d24fd83a61ba52510ca1d81b25f | |
| parent | 2d96afc8f70ef86c66a0b5d80c24a27d6dd13df3 (diff) | |
ext4: Add alignment check for DAX mount
When a partition is not aligned by 4KB, mount -o dax succeeds,
but any read/write access to the filesystem fails, except for
metadata update.
Call bdev_dax_supported() to perform proper precondition checks
which includes this partition alignment check.
Reported-by: Micah Parrish <[email protected]>
Signed-off-by: Toshi Kani <[email protected]>
Reviewed-by: Jan Kara <[email protected]>
Cc: "Theodore Ts'o" <[email protected]>
Cc: Andreas Dilger <[email protected]>
Cc: Jan Kara <[email protected]>
Cc: Dan Williams <[email protected]>
Cc: Ross Zwisler <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Boaz Harrosh <[email protected]>
Signed-off-by: Vishal Verma <[email protected]>
| -rw-r--r-- | fs/ext4/super.c | 11 |
1 files changed, 2 insertions, 9 deletions
diff --git a/fs/ext4/super.c b/fs/ext4/super.c index 20c5d52253b4..3822a5aedc61 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -3417,16 +3417,9 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent) } if (sbi->s_mount_opt & EXT4_MOUNT_DAX) { - if (blocksize != PAGE_SIZE) { - ext4_msg(sb, KERN_ERR, - "error: unsupported blocksize for dax"); - goto failed_mount; - } - if (!sb->s_bdev->bd_disk->fops->direct_access) { - ext4_msg(sb, KERN_ERR, - "error: device does not support dax"); + err = bdev_dax_supported(sb, blocksize); + if (err) goto failed_mount; - } } if (ext4_has_feature_encrypt(sb) && es->s_encryption_level) { |