Messages in this thread Patch in this message | | | From | lizf@kernel ... | Subject | [PATCH 3.4 49/91] NFSv4: Fix another bug in the close/open_downgrade code | Date | Thu, 27 Nov 2014 16:42:32 +0800 |
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From: Trond Myklebust <trond.myklebust@primarydata.com>
3.4.105-rc1 review patch. If anyone has any objections, please let me know.
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commit cd9288ffaea4359d5cfe2b8d264911506aed26a4 upstream.
James Drew reports another bug whereby the NFS client is now sending an OPEN_DOWNGRADE in a situation where it should really have sent a CLOSE: the client is opening the file for O_RDWR, but then trying to do a downgrade to O_RDONLY, which is not allowed by the NFSv4 spec.
Reported-by: James Drews <drews@engr.wisc.edu> Link: http://lkml.kernel.org/r/541AD7E5.8020409@engr.wisc.edu Fixes: aee7af356e15 (NFSv4: Fix problems with close in the presence...) Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com> [lizf: Backported to 3.4: adjust context] Signed-off-by: Zefan Li <lizefan@huawei.com> --- fs/nfs/nfs4proc.c | 30 +++++++++++++++--------------- 1 file changed, 15 insertions(+), 15 deletions(-)
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c index 01afcd5..527a4fc 100644 --- a/fs/nfs/nfs4proc.c +++ b/fs/nfs/nfs4proc.c @@ -2063,23 +2063,23 @@ static void nfs4_close_prepare(struct rpc_task *task, void *data) is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags); is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags); is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags); - /* Calculate the current open share mode */ - calldata->arg.fmode = 0; - if (is_rdonly || is_rdwr) - calldata->arg.fmode |= FMODE_READ; - if (is_wronly || is_rdwr) - calldata->arg.fmode |= FMODE_WRITE; /* Calculate the change in open mode */ + calldata->arg.fmode = 0; if (state->n_rdwr == 0) { - if (state->n_rdonly == 0) { - call_close |= is_rdonly || is_rdwr; - calldata->arg.fmode &= ~FMODE_READ; - } - if (state->n_wronly == 0) { - call_close |= is_wronly || is_rdwr; - calldata->arg.fmode &= ~FMODE_WRITE; - } - } + if (state->n_rdonly == 0) + call_close |= is_rdonly; + else if (is_rdonly) + calldata->arg.fmode |= FMODE_READ; + if (state->n_wronly == 0) + call_close |= is_wronly; + else if (is_wronly) + calldata->arg.fmode |= FMODE_WRITE; + } else if (is_rdwr) + calldata->arg.fmode |= FMODE_READ|FMODE_WRITE; + + if (calldata->arg.fmode == 0) + call_close |= is_rdwr; + spin_unlock(&state->owner->so_lock); if (!call_close) { -- 1.9.1
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