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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 <micah.parrish@hpe.com>
Signed-off-by: Toshi Kani <toshi.kani@hpe.com>
Reviewed-by: Jan Kara <jack@suse.cz>
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>
Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
This commit is contained in:
Toshi Kani 2016-05-10 10:23:54 -06:00 committed by Vishal Verma
parent 2d96afc8f7
commit 87eefeb4e8
1 changed files with 2 additions and 9 deletions
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11
fs/ext4/super.c
View File

@ -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");
err = bdev_dax_supported(sb, blocksize);
if (err)
goto failed_mount;
}
if (!sb->s_bdev->bd_disk->fops->direct_access) {
ext4_msg(sb, KERN_ERR,
"error: device does not support dax");
goto failed_mount;
}
}
if (ext4_has_feature_encrypt(sb) && es->s_encryption_level) {