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overlayfs fixes for 5.5-rc2

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Merge tag 'ovl-fixes-5.5-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs

Pull overlayfs fixes from Miklos Szeredi:
 "Fix some bugs and documentation"

* tag 'ovl-fixes-5.5-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs:
  docs: filesystems: overlayfs: Fix restview warnings
  docs: filesystems: overlayfs: Rename overlayfs.txt to .rst
  ovl: relax WARN_ON() on rename to self
  ovl: fix corner case of non-unique st_dev;st_ino
  ovl: don't use a temp buf for encoding real fh
  ovl: make sure that real fid is 32bit aligned in memory
  ovl: fix lookup failure on multi lower squashfs
This commit is contained in:
Linus Torvalds 2019-12-14 11:13:54 -08:00
commit 81c64b0bd0
10 changed files with 166 additions and 101 deletions
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10
Documentation/filesystems/overlayfs.txt → Documentation/filesystems/overlayfs.rst
View file

@ -1,3 +1,5 @@
.. SPDX-License-Identifier: GPL-2.0
Written by: Neil Brown
Please see MAINTAINERS file for where to send questions.
@ -181,7 +183,7 @@ Kernel config options:
worried about backward compatibility with kernels that have the redirect_dir
feature and follow redirects even if turned off.
Module options (can also be changed through /sys/module/overlay/parameters/*):
Module options (can also be changed through /sys/module/overlay/parameters/):
- "redirect_dir=BOOL":
See OVERLAY_FS_REDIRECT_DIR kernel config option above.
@ -263,7 +265,7 @@ top, lower2 the middle and lower3 the bottom layer.
Metadata only copy up
--------------------
---------------------
When metadata only copy up feature is enabled, overlayfs will only copy
up metadata (as opposed to whole file), when a metadata specific operation
@ -286,10 +288,10 @@ pointed by REDIRECT. This should not be possible on local system as setting
"trusted." xattrs will require CAP_SYS_ADMIN. But it should be possible
for untrusted layers like from a pen drive.
Note: redirect_dir={off|nofollow|follow(*)} conflicts with metacopy=on, and
Note: redirect_dir={off|nofollow|follow[*]} conflicts with metacopy=on, and
results in an error.
(*) redirect_dir=follow only conflicts with metacopy=on if upperdir=... is
[*] redirect_dir=follow only conflicts with metacopy=on if upperdir=... is
given.
Sharing and copying layers