From eb76b3fda1f7c2aa2d1523b36835048a15e5e5d2 Mon Sep 17 00:00:00 2001 From: Andy Adamson Date: Sun, 26 Mar 2006 01:37:26 -0800 Subject: [PATCH] NFSD4: return conflict lock without races Update the NFSv4 server to use the new posix_lock_file_conf() interface. Remove unnecessary (and race-prone) posix_test_file() calls. Signed-off-by: Andy Adamson Signed-off-by: J. Bruce Fields Signed-off-by: Trond Myklebust Cc: Neil Brown Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/nfsd/nfs4state.c | 38 ++++++++++++++++---------------------- 1 file changed, 16 insertions(+), 22 deletions(-) (limited to 'fs/nfsd/nfs4state.c') diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c index c7b87e9..47ec112 100644 --- a/fs/nfsd/nfs4state.c +++ b/fs/nfsd/nfs4state.c @@ -2750,37 +2750,31 @@ nfsd4_lock(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lock * Note: locks.c uses the BKL to protect the inode's lock list. */ - status = posix_lock_file(filp, &file_lock); - dprintk("NFSD: nfsd4_lock: posix_lock_file status %d\n",status); + /* XXX?: Just to divert the locks_release_private at the start of + * locks_copy_lock: */ + conflock.fl_ops = NULL; + conflock.fl_lmops = NULL; + status = posix_lock_file_conf(filp, &file_lock, &conflock); + dprintk("NFSD: nfsd4_lock: posix_lock_file_conf status %d\n",status); switch (-status) { case 0: /* success! */ update_stateid(&lock_stp->st_stateid); memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid, sizeof(stateid_t)); - goto out; - case (EAGAIN): - goto conflicting_lock; + break; + case (EAGAIN): /* conflock holds conflicting lock */ + status = nfserr_denied; + dprintk("NFSD: nfsd4_lock: conflicting lock found!\n"); + nfs4_set_lock_denied(&conflock, &lock->lk_denied); + break; case (EDEADLK): status = nfserr_deadlock; - dprintk("NFSD: nfsd4_lock: posix_lock_file() failed! status %d\n",status); - goto out; + break; default: - status = nfserrno(status); - dprintk("NFSD: nfsd4_lock: posix_lock_file() failed! status %d\n",status); - goto out; - } - -conflicting_lock: - dprintk("NFSD: nfsd4_lock: conflicting lock found!\n"); - status = nfserr_denied; - /* XXX There is a race here. Future patch needed to provide - * an atomic posix_lock_and_test_file - */ - if (!posix_test_lock(filp, &file_lock, &conflock)) { - status = nfserr_serverfault; - goto out; + dprintk("NFSD: nfsd4_lock: posix_lock_file_conf() failed! status %d\n",status); + status = nfserr_resource; + break; } - nfs4_set_lock_denied(&conflock, &lock->lk_denied); out: if (status && lock->lk_is_new && lock_sop) release_stateowner(lock_sop); -- cgit v1.1