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NFSv4: Teach NFSv4 to cache locks when we hold a delegation

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Now that we have a method of dealing with delegation recalls, actually
 enable the caching of posix and BSD locks.

 Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2005-11-04 15:39:36 -05:00
parent 888e694c16
commit 6bfc93ef98
1 changed files with 28 additions and 8 deletions
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36
fs/nfs/nfs4proc.c
View file

@ -2918,6 +2918,10 @@ static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *
struct nfs4_lock_state *lsp;
int status;
/* Is this a delegated lock? */
if (test_bit(NFS_DELEGATED_STATE, &state->flags))
return do_vfs_lock(request->fl_file, request);
status = nfs4_set_lock_state(state, request);
if (status != 0)
return status;
@ -3032,6 +3036,9 @@ static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request
struct nfs4_exception exception = { };
int err;
/* Cache the lock if possible... */
if (test_bit(NFS_DELEGATED_STATE, &state->flags))
return 0;
do {
err = _nfs4_do_setlk(state, F_SETLK, request, 1);
if (err != -NFS4ERR_DELAY)
@ -3047,6 +3054,9 @@ static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request
struct nfs4_exception exception = { };
int err;
err = nfs4_set_lock_state(state, request);
if (err != 0)
return err;
do {
err = _nfs4_do_setlk(state, F_SETLK, request, 0);
if (err != -NFS4ERR_DELAY)
@ -3062,15 +3072,25 @@ static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock
int status;
down_read(&clp->cl_sem);
status = nfs4_set_lock_state(state, request);
if (status == 0)
status = _nfs4_do_setlk(state, cmd, request, 0);
if (status == 0) {
/* Note: we always want to sleep here! */
request->fl_flags |= FL_SLEEP;
if (do_vfs_lock(request->fl_file, request) < 0)
printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
/* Is this a delegated open? */
if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
/* Yes: cache locks! */
status = do_vfs_lock(request->fl_file, request);
/* ...but avoid races with delegation recall... */
if (status < 0 || test_bit(NFS_DELEGATED_STATE, &state->flags))
goto out;
}
status = nfs4_set_lock_state(state, request);
if (status != 0)
goto out;
status = _nfs4_do_setlk(state, cmd, request, 0);
if (status != 0)
goto out;
/* Note: we always want to sleep here! */
request->fl_flags |= FL_SLEEP;
if (do_vfs_lock(request->fl_file, request) < 0)
printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
out:
up_read(&clp->cl_sem);
return status;
}