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authorNeilBrown <neilb@suse.com>2015-07-30 13:00:56 +1000
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-10-01 12:07:31 +0200
commit9520ac796ef656c8ca8f7b0dfc56651f185d845f (patch)
treeab9b7a5ee2f3fe27dbed51140e596753dbbc82de
parent92a6eef0fb73b10dcc9fa3061d3ec2cf604d6d0a (diff)
downloadlinux-linaro-stable-9520ac796ef656c8ca8f7b0dfc56651f185d845f.tar.gz
NFSv4: don't set SETATTR for O_RDONLY|O_EXCL
commit efcbc04e16dfa95fef76309f89710dd1d99a5453 upstream. It is unusual to combine the open flags O_RDONLY and O_EXCL, but it appears that libre-office does just that. [pid 3250] stat("/home/USER/.config", {st_mode=S_IFDIR|0700, st_size=8192, ...}) = 0 [pid 3250] open("/home/USER/.config/libreoffice/4-suse/user/extensions/buildid", O_RDONLY|O_EXCL <unfinished ...> NFSv4 takes O_EXCL as a sign that a setattr command should be sent, probably to reset the timestamps. When it was an O_RDONLY open, the SETATTR command does not identify any actual attributes to change. If no delegation was provided to the open, the SETATTR uses the all-zeros stateid and the request is accepted (at least by the Linux NFS server - no harm, no foul). If a read-delegation was provided, this is used in the SETATTR request, and a Netapp filer will justifiably claim NFS4ERR_BAD_STATEID, which the Linux client takes as a sign to retry - indefinitely. So only treat O_EXCL specially if O_CREAT was also given. Signed-off-by: NeilBrown <neilb@suse.com> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--fs/nfs/nfs4proc.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 20ebcfa3c92e..78679b489484 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -2043,7 +2043,7 @@ static int _nfs4_do_open(struct inode *dir,
if (status != 0)
goto err_opendata_put;
- if ((opendata->o_arg.open_flags & O_EXCL) &&
+ if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) &&
(opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
nfs4_exclusive_attrset(opendata, sattr);