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authorTrond Myklebust <trond.myklebust@primarydata.com>2016-06-25 19:19:28 -0400
committerAnna Schumaker <Anna.Schumaker@Netapp.com>2016-06-28 16:55:34 -0400
commite547f2628327fec6afd2e03b46f113f614cca05b (patch)
tree9daba7ada0d5a10f7fdf1828f38954d86253dcc1
parentd20cb71dbf3487f24549ede1a8e2d67579b4632e (diff)
downloadlinux-e547f2628327fec6afd2e03b46f113f614cca05b.tar.gz
NFS: Fix another OPEN_DOWNGRADE bug
Olga Kornievskaia reports that the following test fails to trigger an OPEN_DOWNGRADE on the wire, and only triggers the final CLOSE. fd0 = open(foo, RDRW) -- should be open on the wire for "both" fd1 = open(foo, RDONLY) -- should be open on the wire for "read" close(fd0) -- should trigger an open_downgrade read(fd1) close(fd1) The issue is that we're missing a check for whether or not the current state transitioned from an O_RDWR state as opposed to having transitioned from a combination of O_RDONLY and O_WRONLY. Reported-by: Olga Kornievskaia <aglo@umich.edu> Fixes: cd9288ffaea4 ("NFSv4: Fix another bug in the close/open_downgrade code") Cc: stable@vger.kernel.org # 2.6.33+ Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
-rw-r--r--fs/nfs/nfs4proc.c5
1 files changed, 2 insertions, 3 deletions
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 406dd3eb68e2..ff416d0e24bc 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -2882,12 +2882,11 @@ static void nfs4_close_prepare(struct rpc_task *task, void *data)
call_close |= is_wronly;
else if (is_wronly)
calldata->arg.fmode |= FMODE_WRITE;
+ if (calldata->arg.fmode != (FMODE_READ|FMODE_WRITE))
+ call_close |= is_rdwr;
} else if (is_rdwr)
calldata->arg.fmode |= FMODE_READ|FMODE_WRITE;
- if (calldata->arg.fmode == 0)
- call_close |= is_rdwr;
-
if (!nfs4_valid_open_stateid(state))
call_close = 0;
spin_unlock(&state->owner->so_lock);