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nfsd4: initialize delegation pointer to lease

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The NFSv4 server was initializing the dp->dl_flock pointer by the
somewhat ridiculous method of a locks_copy_lock callback.

Now that setlease uses the passed-in lock instead of doing a copy,
dl_flock no longer gets set, resulting in the lock leaking on delegation
release, and later possible hangs (among other problems).

So, initialize dl_flock and get rid of the callback.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
J. Bruce Fields 2010-10-30 17:31:16 -04:00 committed by Linus Torvalds
parent 05fa3135fd
commit fcf744a96c
1 changed files with 2 additions and 17 deletions
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19
fs/nfsd/nfs4state.c
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@ -2309,22 +2309,6 @@ void nfsd_release_deleg_cb(struct file_lock *fl)
dp->dl_flock = NULL;
}
/*
* Set the delegation file_lock back pointer.
*
* Called from setlease() with lock_kernel() held.
*/
static
void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
{
struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
if (!dp)
return;
dp->dl_flock = new;
}
/*
* Called from setlease() with lock_kernel() held
*/
@ -2355,7 +2339,6 @@ int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
static const struct lock_manager_operations nfsd_lease_mng_ops = {
.fl_break = nfsd_break_deleg_cb,
.fl_release_private = nfsd_release_deleg_cb,
.fl_copy_lock = nfsd_copy_lock_deleg_cb,
.fl_mylease = nfsd_same_client_deleg_cb,
.fl_change = nfsd_change_deleg_cb,
};
@ -2661,12 +2644,14 @@ nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_sta
fl->fl_file = find_readable_file(stp->st_file);
BUG_ON(!fl->fl_file);
fl->fl_pid = current->tgid;
dp->dl_flock = fl;
/* vfs_setlease checks to see if delegation should be handed out.
* the lock_manager callbacks fl_mylease and fl_change are used
*/
if ((status = vfs_setlease(fl->fl_file, fl->fl_type, &fl))) {
dprintk("NFSD: setlease failed [%d], no delegation\n", status);
dp->dl_flock = NULL;
unhash_delegation(dp);
flag = NFS4_OPEN_DELEGATE_NONE;
goto out;