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author | Jeff Layton <jlayton@poochiereds.net> | 2014-05-01 06:28:46 -0400 |
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committer | Trond Myklebust <trond.myklebust@primarydata.com> | 2014-07-12 18:36:35 -0400 |
commit | 49a4bda22e186c4d0eb07f4a36b5b1a378f9398d (patch) | |
tree | d8b0fa0a46738cb02515b88542b94f6c6b1390a7 /fs/nfs/nfs4state.c | |
parent | 8003d3c4aaa5560400818e14ce5db49cdfd79865 (diff) | |
download | linux-49a4bda22e186c4d0eb07f4a36b5b1a378f9398d.tar.gz |
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>
Diffstat (limited to 'fs/nfs/nfs4state.c')
-rw-r--r-- | fs/nfs/nfs4state.c | 24 |
1 files changed, 18 insertions, 6 deletions
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) |