Long Li c9c9762d4d block: return the correct bvec when checking for gaps ... After commit 07173c3ec2 ("block: enable multipage bvecs"), a bvec can have multiple pages. But bio_will_gap() still assumes one page bvec while checking for merging. If the pages in the bvec go across the seg_boundary_mask, this check for merging can potentially succeed if only the 1st page is tested, and can fail if all the pages are tested. Later, when SCSI builds the SG list the same check for merging is done in __blk_segment_map_sg_merge() with all the pages in the bvec tested. This time the check may fail if the pages in bvec go across the seg_boundary_mask (but tested okay in bio_will_gap() earlier, so those BIOs were merged). If this check fails, we end up with a broken SG list for drivers assuming the SG list not having offsets in intermediate pages. This results in incorrect pages written to the disk. Fix this by returning the multi-page bvec when testing gaps for merging. Cc: Jens Axboe <axboe@kernel.dk> Cc: Johannes Thumshirn <johannes.thumshirn@wdc.com> Cc: Pavel Begunkov <asml.silence@gmail.com> Cc: Ming Lei <ming.lei@redhat.com> Cc: Tejun Heo <tj@kernel.org> Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org> Cc: Jeffle Xu <jefflexu@linux.alibaba.com> Cc: linux-kernel@vger.kernel.org Cc: stable@vger.kernel.org Fixes: 07173c3ec2 ("block: enable multipage bvecs") Signed-off-by: Long Li <longli@microsoft.com> Reviewed-by: Ming Lei <ming.lei@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Link: https://lore.kernel.org/r/1623094445-22332-1-git-send-email-longli@linuxonhyperv.com Signed-off-by: Jens Axboe <axboe@kernel.dk>		2021-06-08 15:06:49 -06:00
..
acpi	Merge branches 'acpi-cppc', 'acpi-video' and 'acpi-utils'	2021-04-26 17:04:27 +02:00
asm-generic	mm: remove xlate_dev_kmem_ptr()	2021-05-07 00:26:34 -07:00
clocksource	ARM: platform support for Apple M1	2021-04-26 12:30:36 -07:00
crypto
drm	Merge drm/drm-fixes into drm-next	2021-04-13 23:15:09 +02:00
dt-bindings	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input	2021-05-06 23:37:55 -07:00
keys	integrity-v5.13	2021-05-01 15:32:18 -07:00
kunit
kvm	Merge branch 'kvm-arm64/kill_oprofile_dependency' into kvmarm-master/next	2021-04-22 13:41:49 +01:00
linux	block: return the correct bvec when checking for gaps	2021-06-08 15:06:49 -06:00
math-emu
media	media updates for v5.13-rc1	2021-04-28 09:24:36 -07:00
memory
misc
net	mm: fix struct page layout on 32-bit systems	2021-05-14 19:41:32 -07:00
pcmcia
ras
rdma	RDMA/restrack: Add support to get resource tracking for SRQ	2021-04-22 10:30:27 -03:00
scsi	SCSI misc on 20210428	2021-04-28 17:22:10 -07:00
soc	Networking changes for 5.13.	2021-04-29 11:57:23 -07:00
sound	ASoC: Updates for v5.13	2021-04-26 16:59:21 +02:00
target
trace	NFS client updates for Linux 5.13	2021-05-07 11:23:41 -07:00
uapi	Merge branch 'for-v5.13-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace	2021-05-21 06:12:52 -10:00
vdso
video
xen	xen/arm: move xen_swiotlb_detect to arm/swiotlb-xen.h	2021-05-14 15:52:05 +02:00