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.
Add alignment check to ext4_fill_super() when -o dax is specified.
Reported-by: Micah Parrish <micah.parr...@hpe.com>
Signed-off-by: Toshi Kani <toshi.k...@hpe.com>
Cc: "Theodore Ts'o" <ty...@mit.edu>
Cc: Andreas Dilger <adilger.ker...@dilger.ca>
Cc: Jan Kara <j...@suse.cz>
Cc: Dan Williams <dan.j.willi...@intel.com>
Cc: Ross Zwisler <ross.zwis...@linux.intel.com>
---
fs/ext4/super.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 304c712..90a8670 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -3421,6 +3421,12 @@ static int ext4_fill_super(struct super_block *sb, void
*data, int silent)
"error: unsupported blocksize for dax");
goto failed_mount;
}
+ if (sb->s_bdev->bd_part->start_sect % (PAGE_SIZE / 512) ||
+ sb->s_bdev->bd_part->nr_sects % (PAGE_SIZE / 512)) {
+ ext4_msg(sb, KERN_ERR,
+ "error: unaligned partition 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");
