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Ross Lagerwall 7cb02d5dc2 xen/blkfront: Only check REQ_FUA for writes 
[ Upstream commit b6ebaa8100090092aa602530d7e8316816d0c98d ]

The existing code silently converts read operations with the
REQ_FUA bit set into write-barrier operations. This results in data
loss as the backend scribbles zeroes over the data instead of returning
it.

While the REQ_FUA bit doesn't make sense on a read operation, at least
one well-known out-of-tree kernel module does set it and since it
results in data loss, let's be safe here and only look at REQ_FUA for
writes.

Signed-off-by: Ross Lagerwall <ross.lagerwall@citrix.com>
Acked-by: Juergen Gross <jgross@suse.com>
Link: https://lore.kernel.org/r/20230426164005.2213139-1-ross.lagerwall@citrix.com
Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2023-06-21 15:59:13 +02:00
..
aoe
for-5.14/drivers-2021-06-29
2021-06-30 12:21:16 -07:00
drbd
drbd: correctly submit flush bio on barrier
2023-05-17 11:50:31 +02:00
mtip32xx
block: fix surprise removal for drivers calling blk_set_queue_dying
2022-02-23 12:03:15 +01:00
null_blk
null_blk: Always check queue mode setting from configfs
2023-05-24 17:36:46 +01:00
paride
SCSI misc on 20210902
2021-09-02 15:09:46 -07:00
rnbd
block/rnbd: replace REQ_OP_FLUSH with REQ_OP_WRITE
2023-06-09 10:32:21 +02:00
rsxx
block: handle bio_split_to_limits() NULL return
2023-01-18 11:48:58 +01:00
xen-blkback
xen-blkback: Advertise feature-persistent as user requested
2022-09-08 12:28:05 +02:00
zram
zram: do not lookup algorithm in backends table
2022-08-25 11:40:34 +02:00
amiflop.c
block: drop unused includes in <linux/genhd.h>
2022-03-16 14:23:46 +01:00
ataflop.c
block: drop unused includes in <linux/genhd.h>
2022-03-16 14:23:46 +01:00
brd.c
brd: mark as nowait compatible
2023-03-17 08:48:51 +01:00
cryptoloop.c
cryptoloop: add a deprecation warning
2021-08-27 10:44:54 -06:00
floppy.c
floppy: Fix memory leak in do_floppy_init()
2022-12-31 13:14:47 +01:00
Kconfig
remove the sx8 block driver
2023-06-14 11:12:59 +02:00
loop.c
loop: LOOP_CONFIGURE: send uevents for partitions
2023-04-05 11:24:56 +02:00
loop.h
loop: reduce the loop_ctl_mutex scope
2021-09-03 22:14:40 -06:00
Makefile
remove the sx8 block driver
2023-06-14 11:12:59 +02:00
n64cart.c
n64cart: convert bi_disk to bi_bdev->bd_disk fix build
2022-04-08 14:24:16 +02:00
nbd.c
nbd: Fix debugfs_create_dir error checking
2023-06-09 10:32:21 +02:00
pktcdvd.c
block: handle bio_split_to_limits() NULL return
2023-01-18 11:48:58 +01:00
ps3disk.c
ps3disk: use memcpy_{from,to}_bvec
2021-08-02 13:37:27 -06:00
ps3vram.c
block: handle bio_split_to_limits() NULL return
2023-01-18 11:48:58 +01:00
rbd_types.h
libceph, rbd: replace zero-length array with flexible-array
2020-06-01 13:22:53 +02:00
rbd.c
rbd: get snapshot context after exclusive lock is ensured to be held
2023-06-14 11:13:06 +02:00
sunvdc.c
block: sunvdc: add check for mdesc_grab() returning NULL
2023-03-22 13:31:27 +01:00
swim3.c
swim3: use blk_mq_alloc_disk
2021-06-11 11:53:02 -06:00
swim_asm.S
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
swim.c
block: drop unused includes in <linux/genhd.h>
2022-03-16 14:23:46 +01:00
virtio_blk.c
virtio-blk: modify the value type of num in virtio_queue_rq()
2022-07-12 16:35:11 +02:00
xen-blkfront.c
xen/blkfront: Only check REQ_FUA for writes
2023-06-21 15:59:13 +02:00
z2ram.c
for-5.14/drivers-2021-06-29
2021-06-30 12:21:16 -07:00