On 29.06.2015 17:35, Miklos Szeredi wrote:
On Sun, Jun 28, 2015 at 05:38:35PM +0300, sa wrote:
On 04.06.2015 16:29, Miklos Szeredi wrote:
Two small patches implementing this follow. Comments and testing welcome.
git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs.git overlayfs-next
---
fs/overlayfs/super.c | 81 +++++++++++++++++++++++++++++++++++++++++++++++-----
1 file changed, 74 insertions(+), 7 deletions(-)
Thank you, it works in our environment mostly as expected, except
of the following:
files already existing in readonly NFS lowerdir can't be opened
for writing (but can be deleted). Newly created files are writable
as expected. The same lowerdir works with aufs without problem.
Is the lower fs exported read-only on the NFS server?
If so, can you please apply the following patch and specify
'default_permissions' mount option?
It works fine.
(sid)root@usbsid:/var# cat test
00000
(sid)root@usbsid:/var# echo 11111 > test
(sid)root@usbsid:/var# cat test
11111
(sid)root@usbsid:/var# echo 22222 >> test
(sid)root@usbsid:/var# cat test
11111
22222
(sid)root@usbsid:/var# mount | grep overlay
overlay on /var type overlay
(rw,relatime,lowerdir=/auvar.ro,upperdir=/auvar.rw/.upperdir,workdir=/auvar.rw/.workdir,default_permissions)
Lower fs exported with (ro,async,no_root_squash,no_subtree_check).
--
sa
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