This is a note to let you know that I've just added the patch titled
blockdev: don't set S_DAX for misaligned partitions
to the 4.2-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
blockdev-don-t-set-s_dax-for-misaligned-partitions.patch
and it can be found in the queue-4.2 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From f0b2e563bc419df7c1b3d2f494574c25125f6aed Mon Sep 17 00:00:00 2001
From: Jeff Moyer <jmoyer@xxxxxxxxxx>
Date: Fri, 14 Aug 2015 16:15:32 -0400
Subject: blockdev: don't set S_DAX for misaligned partitions
From: Jeff Moyer <jmoyer@xxxxxxxxxx>
commit f0b2e563bc419df7c1b3d2f494574c25125f6aed upstream.
The dax code doesn't currently support misaligned partitions,
so disable O_DIRECT via dax until such time as that support
materializes.
Suggested-by: Boaz Harrosh <boaz@xxxxxxxxxxxxx>
Signed-off-by: Jeff Moyer <jmoyer@xxxxxxxxxx>
Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/block_dev.c | 7 +++++++
1 file changed, 7 insertions(+)
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -1241,6 +1241,13 @@ static int __blkdev_get(struct block_dev
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) {
Patches currently in stable-queue which might be from jmoyer@xxxxxxxxxx are
queue-4.2/blockdev-don-t-set-s_dax-for-misaligned-partitions.patch
queue-4.2/dax-fix-o_direct-i-o-to-the-last-block-of-a-blockdev.patch
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