ext2: 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. Signed-off-by: Toshi Kani <toshi.kani@hpe.com> Reviewed-by: Jan Kara <jack@suse.cz> 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>
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@ -922,16 +922,9 @@ static int ext2_fill_super(struct super_block *sb, void *data, int silent)
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blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
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if (sbi->s_mount_opt & EXT2_MOUNT_DAX) {
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if (blocksize != PAGE_SIZE) {
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ext2_msg(sb, KERN_ERR,
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"error: unsupported blocksize for dax");
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err = bdev_dax_supported(sb, blocksize);
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if (err)
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goto failed_mount;
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}
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if (!sb->s_bdev->bd_disk->fops->direct_access) {
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ext2_msg(sb, KERN_ERR,
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"error: device does not support dax");
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goto failed_mount;
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}
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}
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/* If the blocksize doesn't match, re-read the thing.. */
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