Amir Goldstein c553ea4fdf fs/sync.c: sync_file_range(2) may use WB_SYNC_ALL writeback ... 23d0127096 ("fs/sync.c: make sync_file_range(2) use WB_SYNC_NONE writeback") claims that sync_file_range(2) syscall was "created for userspace to be able to issue background writeout and so waiting for in-flight IO is undesirable there" and changes the writeback (back) to WB_SYNC_NONE. This claim is only partially true. It is true for users that use the flag SYNC_FILE_RANGE_WRITE by itself, as does PostgreSQL, the user that was the reason for changing to WB_SYNC_NONE writeback. However, that claim is not true for users that use that flag combination SYNC_FILE_RANGE_{WAIT_BEFORE|WRITE|_WAIT_AFTER}. Those users explicitly requested to wait for in-flight IO as well as to writeback of dirty pages. Re-brand that flag combination as SYNC_FILE_RANGE_WRITE_AND_WAIT and use WB_SYNC_ALL writeback to perform the full range sync request. Link: http://lkml.kernel.org/r/20190409114922.30095-1-amir73il@gmail.com Link: http://lkml.kernel.org/r/20190419072938.31320-1-amir73il@gmail.com Fixes: 23d0127096 ("fs/sync.c: make sync_file_range(2) use WB_SYNC_NONE") Signed-off-by: Amir Goldstein <amir73il@gmail.com> Acked-by: Jan Kara <jack@suse.com> Cc: Dave Chinner <david@fromorbit.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2019-05-14 09:47:50 -07:00
..
acpi	Driver core/kobject patches for 5.2-rc1	2019-05-07 13:01:40 -07:00
asm-generic	hugetlb: allow to free gigantic pages regardless of the configuration	2019-05-14 09:47:47 -07:00
clocksource
crypto	crypto: shash - remove shash_desc::flags	2019-04-25 15:38:12 +08:00
drm	drm pull request for 5.2	2019-05-08 21:35:19 -07:00
dt-bindings	We have a couple new features and changes in the core clk framework this time	2019-05-09 14:50:09 -07:00
keys
kvm
linux	mm: introduce new vm_map_pages() and vm_map_pages_zero() API	2019-05-14 09:47:50 -07:00
math-emu
media	drm pull request for 5.2	2019-05-08 21:35:19 -07:00
memory
misc	ocxl: Provide global MMIO accessors for external drivers	2019-05-03 02:55:02 +10:00
net	net/tcp: use deferred jump label for TCP acked data hook	2019-05-09 11:13:57 -07:00
pcmcia
ras
rdma	RDMA: Add EFA related definitions	2019-05-06 13:47:50 -03:00
scsi
soc	This pull request contains the following changes for MTD:	2019-05-12 17:57:52 -04:00
sound	sound updates for 5.2-rc1	2019-05-09 08:26:55 -07:00
target
trace	mm/vmscan: drop may_writepage and classzone_idx from direct reclaim begin template	2019-05-14 09:47:48 -07:00
uapi	fs/sync.c: sync_file_range(2) may use WB_SYNC_ALL writeback	2019-05-14 09:47:50 -07:00
video
xen