Konstantin Khlebnikov 32b1924b21 ovl: skip overlayfs superblocks at global sync ...

Stacked filesystems like overlayfs has no own writeback, but they have to
forward syncfs() requests to backend for keeping data integrity.

During global sync() each overlayfs instance calls method ->sync_fs() for
backend although it itself is in global list of superblocks too.  As a
result one syscall sync() could write one superblock several times and send
multiple disk barriers.

This patch adds flag SB_I_SKIP_SYNC into sb->sb_iflags to avoid that.

Reported-by: Dmitry Monakhov <dmtrmonakhov@yandex-team.ru>
Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

2020-05-13 11:11:24 +02:00

..

acpi

Merge tag 'acpi-5.7-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

2020-04-06 10:35:06 -07:00

asm-generic

Merge tag 'hyperv-fixes-signed' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux

2020-04-14 11:58:04 -07:00

clocksource

pwm: omap-dmtimer: Drop unused header file

2020-03-30 18:03:06 +02:00

crypto

crypto: curve25519 - do not pollute dispatcher based on assembler

2020-04-09 00:01:59 +09:00

drm

drm/bridge: analogix_dp: Split bind() into probe() and real bind()

2020-04-09 10:29:35 +02:00

dt-bindings

Merge tag 'riscv-for-linus-5.7' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux

2020-04-09 10:51:30 -07:00

keys

KEYS: Don't write out to userspace while holding key semaphore

2020-03-29 12:40:41 +01:00

kunit

kunit: subtests should be indented 4 spaces according to TAP

2020-03-26 14:08:41 -06:00

kvm

KVM: arm64: GICv4.1: Allow SGIs to switch between HW and SW interrupts

2020-03-24 12:15:51 +00:00

linux

ovl: skip overlayfs superblocks at global sync

2020-05-13 11:11:24 +02:00

math-emu

…

media

media: cec-notifier: make cec_notifier_get_conn() static

2020-03-20 09:02:45 +01:00

misc

…

net

cfg80211: fix kernel-doc notation

2020-04-14 12:40:02 +02:00

pcmcia

…

ras

…

rdma

IB/mlx5: Expose UAR object and its alloc/destroy commands

2020-03-27 12:59:04 -03:00

scsi

Merge tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi

2020-04-02 17:03:53 -07:00

soc

net: mscc: ocelot: fix untagged packet drops when enslaving to vlan aware bridge

2020-04-15 12:27:35 -07:00

sound

ALSA: hda: Skip controller resume if not needed

2020-04-13 18:03:16 +02:00

target

scsi: target: fix hang when multiple threads try to destroy the same iscsi session

2020-03-26 21:47:47 -04:00

trace

blk-wbt: Drop needless newlines from tracepoint format strings

2020-04-17 08:21:46 -06:00

uapi

Merge tag 'flexible-array-member-5.7-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux

2020-04-19 10:34:30 -07:00

vdso

vdso: Fix clocksource.h macro detection

2020-03-23 18:51:08 +01:00

video

video: Replace zero-length array with flexible-array member

2020-03-02 16:32:17 +01:00

xen

xen: Use evtchn_type_t as a type for event channels

2020-04-07 12:12:54 +02:00