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nfsd: wake waiters blocked on file_lock before deleting it 

After a blocked nfsd file_lock request is deleted, knfsd will send a
callback to the client and then free the request. Commit 16306a61d3
("fs/locks: always delete_block after waiting.") changed it such that
locks_delete_block is always called on a request after it is awoken,
but that patch missed fixing up blocked nfsd request handling.

Call locks_delete_block on the block to wake up any locks still blocked
on the nfsd lock request before freeing it. Some of its callers already
do this however, so just remove those calls.

URL: https://bugzilla.kernel.org/show_bug.cgi?id=203363
Fixes: 16306a61d3 ("fs/locks: always delete_block after waiting.")
Reported-by: Slawomir Pryczek <slawek1211@gmail.com>
Cc: Neil Brown <neilb@suse.com>
Cc: stable@vger.kernel.org
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Jeff Layton 2019-04-22 12:34:23 -04:00 committed by J. Bruce Fields
parent e6abc8caa6
commit 6aaafc43a4
1 changed files with 1 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
fs/nfsd/nfs4state.c
View File

@ -265,6 +265,7 @@ find_or_allocate_block(struct nfs4_lockowner *lo, struct knfsd_fh *fh,
static void
free_blocked_lock(struct nfsd4_blocked_lock *nbl)
{
locks_delete_block(&nbl->nbl_lock);
locks_release_private(&nbl->nbl_lock);
kfree(nbl);
}
@ -293,7 +294,6 @@ remove_blocked_locks(struct nfs4_lockowner *lo)
nbl = list_first_entry(&reaplist, struct nfsd4_blocked_lock,
nbl_lru);
list_del_init(&nbl->nbl_lru);
locks_delete_block(&nbl->nbl_lock);
free_blocked_lock(nbl);
}
}
@ -4863,7 +4863,6 @@ nfs4_laundromat(struct nfsd_net *nn)
nbl = list_first_entry(&reaplist,
struct nfsd4_blocked_lock, nbl_lru);
list_del_init(&nbl->nbl_lru);
locks_delete_block(&nbl->nbl_lock);
free_blocked_lock(nbl);
}
out: