nfs4: queue free_lock_state job submission to nfsiod

We got a report of the following warning in Fedora:

BUG: sleeping function called from invalid context at mm/slub.c:969
in_atomic(): 1, irqs_disabled(): 0, pid: 533, name: bash
3 locks held by bash/533:
 #0:  (&sp->so_delegreturn_mutex){+.+...}, at: [<ffffffffa033da62>] nfs4_proc_lock+0x262/0x910 [nfsv4]
 #1:  (&nfsi->rwsem){.+.+.+}, at: [<ffffffffa033da6a>] nfs4_proc_lock+0x26a/0x910 [nfsv4]
 #2:  (&sb->s_type->i_lock_key#23){+.+...}, at: [<ffffffff812998dc>] flock_lock_file_wait+0x8c/0x3a0
CPU: 0 PID: 533 Comm: bash Not tainted 3.15.0-0.rc1.git1.1.fc21.x86_64 #1
Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
 0000000000000000 00000000d664ff3c ffff880078b69a70 ffffffff817e82e0
 0000000000000000 ffff880078b69a98 ffffffff810cf1a4 0000000000000050
 0000000000000050 ffff88007cc01a00 ffff880078b69ad8 ffffffff8121449e
Call Trace:
 [<ffffffff817e82e0>] dump_stack+0x4d/0x66
 [<ffffffff810cf1a4>] __might_sleep+0x184/0x240
 [<ffffffff8121449e>] kmem_cache_alloc_trace+0x4e/0x330
 [<ffffffffa0331124>] ? nfs4_release_lockowner+0x74/0x110 [nfsv4]
 [<ffffffffa0331124>] nfs4_release_lockowner+0x74/0x110 [nfsv4]
 [<ffffffffa0352340>] nfs4_put_lock_state+0x90/0xb0 [nfsv4]
 [<ffffffffa0352375>] nfs4_fl_release_lock+0x15/0x20 [nfsv4]
 [<ffffffff81297515>] locks_free_lock+0x45/0x90
 [<ffffffff8129996c>] flock_lock_file_wait+0x11c/0x3a0
 [<ffffffffa033da6a>] ? nfs4_proc_lock+0x26a/0x910 [nfsv4]
 [<ffffffffa033301e>] do_vfs_lock+0x1e/0x30 [nfsv4]
 [<ffffffffa033da79>] nfs4_proc_lock+0x279/0x910 [nfsv4]
 [<ffffffff810dbb26>] ? local_clock+0x16/0x30
 [<ffffffff810f5a3f>] ? lock_release_holdtime.part.28+0xf/0x200
 [<ffffffffa02f820c>] do_unlk+0x8c/0xc0 [nfs]
 [<ffffffffa02f85c5>] nfs_flock+0xa5/0xf0 [nfs]
 [<ffffffff8129a6f6>] locks_remove_file+0xb6/0x1e0
 [<ffffffff812159d8>] ? kfree+0xd8/0x2d0
 [<ffffffff8123bc63>] __fput+0xd3/0x210
 [<ffffffff8123bdee>] ____fput+0xe/0x10
 [<ffffffff810bfb6d>] task_work_run+0xcd/0xf0
 [<ffffffff81019cd1>] do_notify_resume+0x61/0x90
 [<ffffffff817fbea2>] int_signal+0x12/0x17

The problem is that NFSv4 is trying to do an allocation from
fl_release_private (in order to send a RELEASE_LOCKOWNER call). That
function can be called while holding the inode->i_lock, and it's
currently set up to do __GFP_WAIT allocations. v4.1 code has a
similar problem.

This patch adds a work_struct to the nfs4_lock_state and has the code
queue the free_lock_state operation to nfsiod.

Reported-by: Josh Stone <jistone@redhat.com>
Signed-off-by: Jeff Layton <jlayton@poochiereds.net>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>

2 files changed, 25 insertions, 12 deletions

diff --git a/fs/nfs/nfs4_fs.h b/fs/nfs/nfs4_fs.h
index 19f567c39670..5e2a8afc72cb 100644
--- a/fs/nfs/nfs4_fs.h
+++ b/fs/nfs/nfs4_fs.h
@@ -130,15 +130,16 @@ enum {
  */
 
 struct nfs4_lock_state {
-        struct list_head        ls_locks;       /* Other lock stateids */
-        struct nfs4_state *     ls_state;       /* Pointer to open state */
+        struct list_head                ls_locks;   /* Other lock stateids */
+        struct nfs4_state *             ls_state;   /* Pointer to open state */
 #define NFS_LOCK_INITIALIZED 0
 #define NFS_LOCK_LOST        1
-        unsigned long           ls_flags;
+        unsigned long                   ls_flags;
         struct nfs_seqid_counter        ls_seqid;
-        nfs4_stateid            ls_stateid;
-        atomic_t                ls_count;
-        fl_owner_t              ls_owner;
+        nfs4_stateid                    ls_stateid;
+        atomic_t                        ls_count;
+        fl_owner_t                      ls_owner;
+        struct work_struct              ls_release;
 };
 
 /* bits for nfs4_state->flags */
diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
index 544040835482..a770c8e469a7 100644
--- a/fs/nfs/nfs4state.c
+++ b/fs/nfs/nfs4state.c
@@ -799,6 +799,18 @@ __nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner)
         return NULL;
 }
 
+static void
+free_lock_state_work(struct work_struct *work)
+{
+        struct nfs4_lock_state *lsp = container_of(work,
+                                        struct nfs4_lock_state, ls_release);
+        struct nfs4_state *state = lsp->ls_state;
+        struct nfs_server *server = state->owner->so_server;
+        struct nfs_client *clp = server->nfs_client;
+
+        clp->cl_mvops->free_lock_state(server, lsp);
+}
+
 /*
  * Return a compatible lock_state. If no initialized lock_state structure
  * exists, return an uninitialized one.
@@ -820,6 +832,7 @@ static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, f
         if (lsp->ls_seqid.owner_id < 0)
                 goto out_free;
         INIT_LIST_HEAD(&lsp->ls_locks);
+        INIT_WORK(&lsp->ls_release, free_lock_state_work);
         return lsp;
 out_free:
         kfree(lsp);
@@ -883,13 +896,12 @@ void nfs4_put_lock_state(struct nfs4_lock_state *lsp)
         if (list_empty(&state->lock_states))
                 clear_bit(LK_STATE_IN_USE, &state->flags);
         spin_unlock(&state->state_lock);
-        server = state->owner->so_server;
-        if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
-                struct nfs_client *clp = server->nfs_client;
-
-                clp->cl_mvops->free_lock_state(server, lsp);
-        } else
+        if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags))
+                queue_work(nfsiod_workqueue, &lsp->ls_release);
+        else {
+                server = state->owner->so_server;
                 nfs4_free_lock_state(server, lsp);
+        }
 }
 
 static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src)