| Message ID | 1462494596-20938-4-git-send-email-toshi.kani@hpe.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Thu 05-05-16 18:29:54, Toshi Kani wrote: > 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_supports_dax() to perform proper precondition checks > which includes this partition alignment check. > > Reported-by: Micah Parrish <micah.parrish@hpe.com> > Signed-off-by: Toshi Kani <toshi.kani@hpe.com> > Cc: "Theodore Ts'o" <tytso@mit.edu> > Cc: Andreas Dilger <adilger.kernel@dilger.ca> > Cc: Jan Kara <jack@suse.cz> > Cc: Dan Williams <dan.j.williams@intel.com> > Cc: Ross Zwisler <ross.zwisler@linux.intel.com> > Cc: Christoph Hellwig <hch@infradead.org> > Cc: Boaz Harrosh <boaz@plexistor.com> Looks good. You can add: Reviewed-by: Jan Kara <jack@suse.cz> Honza
diff --git a/fs/ext4/super.c b/fs/ext4/super.c index 304c712..e7ca71c 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -3416,16 +3416,9 @@ 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_supports_dax(sb, blocksize); + if (err) goto failed_mount; - } } if (ext4_has_feature_encrypt(sb) && es->s_encryption_level) {
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_supports_dax() to perform proper precondition checks which includes this partition alignment check. Reported-by: Micah Parrish <micah.parrish@hpe.com> Signed-off-by: Toshi Kani <toshi.kani@hpe.com> Cc: "Theodore Ts'o" <tytso@mit.edu> Cc: Andreas Dilger <adilger.kernel@dilger.ca> Cc: Jan Kara <jack@suse.cz> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Ross Zwisler <ross.zwisler@linux.intel.com> Cc: Christoph Hellwig <hch@infradead.org> Cc: Boaz Harrosh <boaz@plexistor.com> --- fs/ext4/super.c | 11 ++--------- 1 file changed, 2 insertions(+), 9 deletions(-)