Amir Goldstein 85fdee1eef ovl: fix regression caused by exclusive upper/work dir protection ... Enforcing exclusive ownership on upper/work dirs caused a docker regression: https://github.com/moby/moby/issues/34672. Euan spotted the regression and pointed to the offending commit. Vivek has brought the regression to my attention and provided this reproducer: Terminal 1: mount -t overlay -o workdir=work,lowerdir=lower,upperdir=upper none merged/ Terminal 2: unshare -m Terminal 1: umount merged mount -t overlay -o workdir=work,lowerdir=lower,upperdir=upper none merged/ mount: /root/overlay-testing/merged: none already mounted or mount point busy To fix the regression, I replaced the error with an alarming warning. With index feature enabled, mount does fail, but logs a suggestion to override exclusive dir protection by disabling index. Note that index=off mount does take the inuse locks, so a concurrent index=off will issue the warning and a concurrent index=on mount will fail. Documentation was updated to reflect this change. Fixes: 2cac0c00a6 ("ovl: get exclusive ownership on upper/work dirs") Cc: <stable@vger.kernel.org> # v4.13 Reported-by: Euan Kemp <euank@euank.com> Reported-by: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>		2017-10-05 15:53:18 +02:00
..
caching	fscache: remove unused ->now_uncached callback	2017-09-06 17:27:26 -07:00
cifs	CIFS/SMB3: Update documentation to reflect SMB3 and various changes	2017-09-17 10:48:00 -05:00
configfs	fs: configfs: don't return anything from drop_link	2016-12-01 10:50:49 +01:00
nfs	doc: ReSTify keys-request-key.txt	2017-05-18 10:33:51 -06:00
pohmelfs	Documentation: fix common spelling mistakes	2016-04-28 07:51:59 -06:00
9p.txt
00-INDEX	logfs: remove from tree	2016-12-14 23:48:11 -05:00
adfs.txt
affs.txt
afs.txt	rxrpc: Change module filename to rxrpc.ko	2017-02-17 15:09:19 -05:00
autofs4-mount-control.txt	autofs: update ioctl documentation regarding struct autofs_dev_ioctl	2017-02-27 18:43:45 -08:00
autofs4.txt	Fix up over-eager 'wait_queue_t' renaming	2017-07-10 11:40:19 -07:00
automount-support.txt	Documentation: remove outdated information from automount-support.txt	2015-05-15 01:10:38 -04:00
befs.txt
bfs.txt	Tigran has moved	2017-05-12 15:57:15 -07:00
btrfs.txt	Documentation: btrfs: remove usage specific information	2016-03-11 17:02:09 +01:00
ceph.txt	ceph: set io_pages bdi hint	2017-02-20 12:16:05 +01:00
coda.txt
conf.py	docs-rst: convert filesystems book to ReST	2017-05-16 08:44:08 -03:00
cramfs.txt	mm, fs: remove remaining PAGE_CACHE_* and page_cache_{get,release} usage	2016-04-04 10:41:08 -07:00
dax.txt	dax: use common 4k zero page for dax mmap reads	2017-09-06 17:27:24 -07:00
debugfs.txt	debugfs: Pass bool pointer to debugfs_create_bool()	2015-10-04 11:36:07 +01:00
devpts.txt	devpts: Make each mount of devpts an independent filesystem.	2016-06-05 10:36:01 -07:00
directory-locking	vfs: remove unused i_op->rename	2016-09-27 11:03:58 +02:00
dlmfs.txt	ocfs2: update web page + git tree in documentation	2015-02-28 09:57:50 -08:00
dnotify.txt
ecryptfs.txt
efivarfs.txt	efi: Make efivarfs entries immutable by default	2016-02-10 16:25:52 +00:00
exofs.txt
ext2.txt	fs: Remove ext3 filesystem driver	2015-07-23 20:59:40 +02:00
ext3.txt	fs: Remove ext3 filesystem driver	2015-07-23 20:59:40 +02:00
ext4.txt	Documentation: Fix dead URLs to ftp.kernel.org	2017-03-29 15:46:06 -06:00
f2fs.txt	f2fs: support journalled quota	2017-08-21 15:54:48 -07:00
fiemap.txt	fsioctl.c: make generic_block_fiemap() signal-tolerant	2015-02-10 14:30:30 -08:00
files.txt
fuse.txt
gfs2-glocks.txt	gfs2: Remove gl_spin define	2015-10-29 12:57:48 -05:00
gfs2-uevents.txt
gfs2.txt
hfs.txt
hfsplus.txt
hpfs.txt
index.rst	docs-rst: don't ignore internal functions for jbd2 docs	2017-05-16 08:44:09 -03:00
inotify.txt	inotify: update documentation to reflect code changes	2015-02-10 14:30:28 -08:00
isofs.txt
jfs.txt
Locking	vfs: add flags to d_real()	2017-09-04 21:42:22 +02:00
locks.txt	docs: fix locations of several documents that got moved	2016-10-24 08:12:35 -02:00
mandatory-locking.txt
ncpfs.txt
nilfs2.txt	nilfs2: move ioctl interface and disk layout to uapi separately	2016-08-02 19:35:21 -04:00
ntfs.txt	NTFS: Remove changelog from Documentation/filesystems/ntfs.txt.	2014-10-16 12:43:57 +01:00
ocfs2-online-filecheck.txt	Doc: ocfs: Fix typo in filesystems/ocfs2-online-filecheck.txt	2016-07-01 16:17:15 -06:00
ocfs2.txt	ocfs2: update web page + git tree in documentation	2015-02-28 09:57:50 -08:00
omfs.txt
orangefs.txt	orangefs: documentation clean up	2017-09-14 14:54:39 -04:00
overlayfs.txt	ovl: fix regression caused by exclusive upper/work dir protection	2017-10-05 15:53:18 +02:00
path-lookup.md	Documentation: add new description of path-name lookup.	2015-11-02 18:18:25 -07:00
path-lookup.txt	Documentation: add new description of path-name lookup.	2015-11-02 18:18:25 -07:00
porting	VFS: Differentiate mount flags (MS_*) from internal superblock flags	2017-07-17 08:45:35 +01:00
proc.txt	procfs: fdinfo: extend information about epoll target files	2017-07-12 16:26:01 -07:00
qnx6.txt	Documentation: fix common spelling mistakes	2016-04-28 07:51:59 -06:00
quota.txt	scripts/spelling.txt: add "an user" pattern and fix typo instances	2017-02-27 18:43:46 -08:00
ramfs-rootfs-initramfs.txt
relay.txt
romfs.txt
seq_file.txt	Documentation: update seq_file	2014-12-29 15:40:18 -07:00
sharedsubtree.txt	doc: fix grammar	2016-03-09 15:33:06 -07:00
spufs.txt
squashfs.txt	Squashfs: Add LZ4 compression configuration option	2014-11-27 18:48:44 +00:00
sysfs-pci.txt	PCI: Add pci_mmap_resource_range() and use it for ARM64	2017-04-20 08:47:47 -05:00
sysfs-tagging.txt	sysfs-tagging.txt: fix pre-kernfs references	2015-09-13 14:38:51 -06:00
sysfs.txt	sysfs.txt: mention that store method buffers are null-terminated	2015-09-13 14:38:51 -06:00
sysv-fs.txt
tmpfs.txt	Documenation: update cgroup's document path	2016-08-03 15:43:58 -06:00
ubifs.txt
udf.txt
ufs.txt
vfat.txt	fat: add config option to set UTF-8 mount option by default	2016-03-22 15:36:02 -07:00
vfs.txt	Merge branch 'overlayfs-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs	2017-09-13 09:11:44 -07:00
xfs-delayed-logging-design.txt
xfs-self-describing-metadata.txt
xfs.txt	xfs: deprecate barrier/nobarrier mount option	2016-12-09 16:49:54 +11:00