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| author | Jeff Layton <jlayton@redhat.com> | 2016-09-17 18:17:39 -0400 |
|---|---|---|
| committer | Anna Schumaker <Anna.Schumaker@Netapp.com> | 2016-09-22 15:54:27 -0400 |
| commit | a1d617d8f134679741b0b35e8e1436b015ac5538 (patch) | |
| tree | 368917c084a33685bfac7d3c9c593dc7069deb46 /fs/nfs/callback_proc.c | |
| parent | d2f3a7f9187b0c6a64276d598cd6157437c5a336 (diff) | |
| download | linux-stable-a1d617d8f134679741b0b35e8e1436b015ac5538.tar.gz linux-stable-a1d617d8f134679741b0b35e8e1436b015ac5538.tar.bz2 linux-stable-a1d617d8f134679741b0b35e8e1436b015ac5538.zip | |
nfs: allow blocking locks to be awoken by lock callbacks
Add a waitqueue head to the client structure. Have clients set a wait
on that queue prior to requesting a lock from the server. If the lock
is blocked, then we can use that to wait for wakeups.
Note that we do need to do this "manually" since we need to set the
wait on the waitqueue prior to requesting the lock, but requesting a
lock can involve activities that can block.
However, only do that for NFSv4.1 locks, either by compiling out
all of the waitqueue handling when CONFIG_NFS_V4_1 is disabled, or
skipping all of it at runtime if we're dealing with v4.0, or v4.1
servers that don't send lock callbacks.
Note too that even when we expect to get a lock callback, RFC5661
section 20.11.4 is pretty clear that we still need to poll for them,
so we do still sleep on a timeout. We do however always poll at the
longest interval in that case.
Signed-off-by: Jeff Layton <jlayton@redhat.com>
[Anna: nfs4_retry_setlk() "status" should default to -ERESTARTSYS]
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Diffstat (limited to 'fs/nfs/callback_proc.c')
| -rw-r--r-- | fs/nfs/callback_proc.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/nfs/callback_proc.c b/fs/nfs/callback_proc.c index 974881824414..e9aa235e9d10 100644 --- a/fs/nfs/callback_proc.c +++ b/fs/nfs/callback_proc.c @@ -638,6 +638,10 @@ __be32 nfs4_callback_notify_lock(struct cb_notify_lock_args *args, void *dummy, dprintk_rcu("NFS: CB_NOTIFY_LOCK request from %s\n", rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR)); + /* Don't wake anybody if the string looked bogus */ + if (args->cbnl_valid) + __wake_up(&cps->clp->cl_lock_waitq, TASK_NORMAL, 0, args); + return htonl(NFS4_OK); } #endif /* CONFIG_NFS_V4_1 */ |