Commit 39325bd0 authored Nov 26, 2007 by J. Bruce Fields

nfsd4: fix bad seqid on lock request incompatible with open mode



The failure to return a stateowner from nfs4_preprocess_seqid_op() means
in the case where a lock request is of a type incompatible with an open
(due to, e.g., an application attempting a write lock on a file open for
read), means that fs/nfsd/nfs4xdr.c:ENCODE_SEQID_OP_TAIL() never bumps
the seqid as it should.  The client, attempting to close the file
afterwards, then gets an (incorrect) bad sequence id error.  Worse, this
prevents the open file from ever being closed, so we leak state.

Thanks to Benny Halevy and Trond Myklebust for analysis, and to Steven
Wilton for the report and extensive data-gathering.

Cc: Benny Halevy <bhalevy@panasas.com>
Cc: Steven Wilton <steven.wilton@team.eftel.com.au>
Cc: Trond Myklebust <trond.myklebust@fys.uio.no>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>

parent b7e6b869

fs/nfsd/nfs4state.c

+3 −4

Original line number	Diff line number	Diff line
		@@ -2093,8 +2093,10 @@ nfs4_preprocess_seqid_op(struct svc_fh current_fh, u32 seqid, stateid_t statei
		goto check_replay;
		}

		*stpp = stp;
		*sopp = sop = stp->st_stateowner;

		if (lock) {
		struct nfs4_stateowner *sop = stp->st_stateowner;
		clientid_t *lockclid = &lock->v.new.clientid;
		struct nfs4_client *clp = sop->so_client;
		int lkflg = 0;
		@@ -2124,9 +2126,6 @@ nfs4_preprocess_seqid_op(struct svc_fh current_fh, u32 seqid, stateid_t statei
		return nfserr_bad_stateid;
		}

		*stpp = stp;
		*sopp = sop = stp->st_stateowner;

		/*
		* We now validate the seqid and stateid generation numbers.
		* For the moment, we ignore the possibility of

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