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blockdev: don't set S_DAX for misaligned partitions

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The dax code doesn't currently support misaligned partitions,
so disable O_DIRECT via dax until such time as that support
materializes.

Cc: <stable@vger.kernel.org>
Suggested-by: Boaz Harrosh <boaz@plexistor.com>
Signed-off-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Jeff Moyer 2015-08-14 16:15:32 -04:00 committed by Dan Williams
parent e94f5a2285
commit f0b2e563bc
1 changed files with 7 additions and 0 deletions
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7
fs/block_dev.c
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@ -1242,6 +1242,13 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
goto out_clear;
}
bd_set_size(bdev, (loff_t)bdev->bd_part->nr_sects << 9);
/*
* If the partition is not aligned on a page
* boundary, we can't do dax I/O to it.
*/
if ((bdev->bd_part->start_sect % (PAGE_SIZE / 512)) ||
(bdev->bd_part->nr_sects % (PAGE_SIZE / 512)))
bdev->bd_inode->i_flags &= ~S_DAX;
}
} else {
if (bdev->bd_contains == bdev) {