Konstantin Khlebnikov 47f6ce223d ovl: skip overlayfs superblocks at global sync ... BugLink: https://bugs.launchpad.net/bugs/2049084 [ Upstream commit 32b1924b21 ] 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> Stable-dep-of: b836c4d29f27 ("ima: detect changes to the backing overlay file") Signed-off-by: Sasha Levin <sashal@kernel.org> Signed-off-by: Manuel Diewald <manuel.diewald@canonical.com> Signed-off-by: Roxana Nicolescu <roxana.nicolescu@canonical.com>		2024-02-02 14:13:17 +01:00
..
Kconfig	treewide: Add SPDX license identifier - Makefile/Kconfig	2019-05-21 10:50:46 +02:00
Makefile	…
copy_up.c	overlayfs: set ctime when setting mtime and atime	2024-01-05 14:29:57 +01:00
dir.c	ovl: Use ovl mounter's fsuid and fsgid in ovl_link()	2023-02-01 15:23:19 +01:00
export.c	ovl: drop WARN_ON() dentry is NULL in ovl_encode_fh()	2022-10-17 15:00:15 +02:00
file.c	UBUNTU: SAUCE: overlayfs: fix reference count mismatch	2023-08-09 12:25:42 +02:00
inode.c	…
namei.c	new helper: lookup_positive_unlocked()	2023-10-30 11:42:07 +01:00
overlayfs.h	ovl: fix warning in ovl_create_real()	2022-03-07 16:34:17 +01:00
ovl_entry.h	ovl: check type and offset of struct vfsmount in ovl_entry	2023-10-30 11:41:55 +01:00
readdir.c	…
super.c	ovl: skip overlayfs superblocks at global sync	2024-02-02 14:13:17 +01:00
util.c	…