Ming Lei 85a8ce62c2 block: add bio_truncate to fix guard_bio_eod ... Some filesystem, such as vfat, may send bio which crosses device boundary, and the worse thing is that the IO request starting within device boundaries can contain more than one segment past EOD. Commit dce30ca9e3 ("fs: fix guard_bio_eod to check for real EOD errors") tries to fix this issue by returning -EIO for this situation. However, this way lets fs user code lose chance to handle -EIO, then sync_inodes_sb() may hang for ever. Also the current truncating on last segment is dangerous by updating the last bvec, given bvec table becomes not immutable any more, and fs bio users may not retrieve the truncated pages via bio_for_each_segment_all() in its .end_io callback. Fixes this issue by supporting multi-segment truncating. And the approach is simpler: - just update bio size since block layer can make correct bvec with the updated bio size. Then bvec table becomes really immutable. - zero all truncated segments for read bio Cc: Carlos Maiolino <cmaiolino@redhat.com> Cc: linux-fsdevel@vger.kernel.org Fixed-by: dce30ca9e3 ("fs: fix guard_bio_eod to check for real EOD errors") Reported-by: syzbot+2b9e54155c8c25d8d165@syzkaller.appspotmail.com Signed-off-by: Ming Lei <ming.lei@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>		2019-12-28 09:44:56 -07:00
..
acpi	Merge branches 'acpi-utils', 'acpi-platform', 'acpi-video' and 'acpi-doc'	2019-11-26 10:30:49 +01:00
asm-generic	powerpc updates for 5.5 #2	2019-12-06 13:36:31 -08:00
clocksource
crypto
drm	mm + drm coherent memory support for vmwgfx	2019-11-30 09:38:11 -08:00
dt-bindings	ARM: Device-tree updates	2019-12-05 12:09:47 -08:00
keys	powerpc updates for 5.5	2019-11-30 14:35:43 -08:00
kunit
kvm
linux	block: add bio_truncate to fix guard_bio_eod	2019-12-28 09:44:56 -07:00
math-emu
media	drm main pull for 5.5-rc1	2019-11-27 17:45:48 -08:00
misc
net	treewide: Use sizeof_field() macro	2019-12-09 10:36:44 -08:00
pcmcia
ras
rdma	IB/core: Introduce rdma_user_mmap_entry_insert_range() API	2019-12-12 16:55:36 -05:00
scsi
soc	drm msm + fixes for 5.5-rc1	2019-12-06 10:28:09 -08:00
sound	ALSA: hda: Modify stream stripe mask only when needed	2019-12-03 07:46:30 +01:00
target
trace	This is a relatively quiet cycle for nfsd, mainly various bugfixes.	2019-12-07 16:56:00 -08:00
uapi	io_uring-5.5-20191212	2019-12-13 14:24:54 -08:00
vdso
video
xen	dma-mapping updates for 5.5-rc1	2019-11-28 11:16:43 -08:00