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authorTrond Myklebust <trond.myklebust@primarydata.com>2016-06-25 19:19:28 -0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-07-27 09:47:30 -0700
commitb5d4a793312969e4dcb0156d4a29bb5f2f5c15f0 (patch)
tree354bb24e239a03073a4dae2f3168cb32dd92f68a /fs/nfs
parent44d86dbf9af1f5d328057eb1137265231da17540 (diff)
NFS: Fix another OPEN_DOWNGRADE bug
commit e547f2628327fec6afd2e03b46f113f614cca05b upstream. 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") Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/nfs')
-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 98a44157353a..fc215ab4dcd5 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -2854,12 +2854,11 @@ 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);