Konstantin Khlebnikov 410fb31d89 ovl: skip overlayfs superblocks at global sync ... [ 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: b836c4d29f ("ima: detect changes to the backing overlay file") Signed-off-by: Sasha Levin <sashal@kernel.org>		2023-12-08 08:43:26 +01:00
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copy_up.c	overlayfs: set ctime when setting mtime and atime	2023-10-25 11:16:53 +02:00
dir.c	ovl: Use ovl mounter's fsuid and fsgid in ovl_link()	2023-01-18 11:30:40 +01:00
export.c	ovl: drop WARN_ON() dentry is NULL in ovl_encode_fh()	2022-08-25 11:14:54 +02:00
file.c	ovl: fix unneeded call to ovl_change_flags()	2020-07-22 09:32:10 +02:00
inode.c	ovl: perform vfs_getxattr() with mounter creds	2021-02-23 15:00:56 +01:00
namei.c	new helper: lookup_positive_unlocked()	2023-09-23 10:47:59 +02:00
overlayfs.h	ovl: fix warning in ovl_create_real()	2021-12-22 09:19:04 +01:00
ovl_entry.h	ovl: fix regression caused by overlapping layers detection	2019-09-21 07:17:14 +02:00
readdir.c	ovl: fix wrong WARN_ON() in ovl_cache_update_ino()	2020-02-11 04:34:02 -08:00
super.c	ovl: skip overlayfs superblocks at global sync	2023-12-08 08:43:26 +01:00
util.c	ovl: detect overlapping layers	2019-06-25 11:35:52 +08:00