| Message ID | 1461962375-3720-3-git-send-email-toshi.kani@hpe.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
diff --git a/fs/ext2/super.c b/fs/ext2/super.c index b78caf2..34e32d9 100644 --- a/fs/ext2/super.c +++ b/fs/ext2/super.c @@ -927,6 +927,12 @@ static int ext2_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)) { + ext2_msg(sb, KERN_ERR, + "error: unaligned partition for dax"); + goto failed_mount; + } if (!sb->s_bdev->bd_disk->fops->direct_access) { ext2_msg(sb, KERN_ERR, "error: device does not support dax");
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 ext2_fill_super() when -o dax is specified. Signed-off-by: Toshi Kani <toshi.kani@hpe.com> Cc: Jan Kara <jack@suse.cz> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Ross Zwisler <ross.zwisler@linux.intel.com> --- fs/ext2/super.c | 6 ++++++ 1 file changed, 6 insertions(+)