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authorJ. Bruce Fields <bfields@citi.umich.edu>2007-11-26 17:06:39 -0500
committerJ. Bruce Fields <bfields@citi.umich.edu>2008-02-01 16:42:06 -0500
commit39325bd03fc16d903f1e0f51104436d939899c8c (patch)
treede63f3c58a3b82d26223e4dfdda1a98570c5a84a /fs/nfsd
parentb7e6b86948df8d08d420558212e09eb449be9bfa (diff)
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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>
Diffstat (limited to 'fs/nfsd')
-rw-r--r--fs/nfsd/nfs4state.c7
1 files changed, 3 insertions, 4 deletions
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 11aa4b6..c4b10a1 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -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