diff options
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/nfs/callback_proc.c | 4 | ||||
| -rw-r--r-- | fs/nfs/nfs4client.c | 3 | ||||
| -rw-r--r-- | fs/nfs/nfs4proc.c | 94 |
3 files changed, 100 insertions, 1 deletions
diff --git a/fs/nfs/callback_proc.c b/fs/nfs/callback_proc.c index 9748818..e9aa235e 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 */ diff --git a/fs/nfs/nfs4client.c b/fs/nfs/nfs4client.c index a2c9654..074ac71 100644 --- a/fs/nfs/nfs4client.c +++ b/fs/nfs/nfs4client.c @@ -199,6 +199,9 @@ struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *cl_init) clp->cl_minorversion = cl_init->minorversion; clp->cl_mvops = nfs_v4_minor_ops[cl_init->minorversion]; clp->cl_mig_gen = 1; +#if IS_ENABLED(CONFIG_NFS_V4_1) + init_waitqueue_head(&clp->cl_lock_waitq); +#endif return clp; error: diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c index a74c416..5ec333f 100644 --- a/fs/nfs/nfs4proc.c +++ b/fs/nfs/nfs4proc.c @@ -6166,7 +6166,8 @@ static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock * #define NFS4_LOCK_MAXTIMEOUT (30 * HZ) static int -nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) +nfs4_retry_setlk_simple(struct nfs4_state *state, int cmd, + struct file_lock *request) { int status = -ERESTARTSYS; unsigned long timeout = NFS4_LOCK_MINTIMEOUT; @@ -6183,6 +6184,97 @@ nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) return status; } +#ifdef CONFIG_NFS_V4_1 +struct nfs4_lock_waiter { + struct task_struct *task; + struct inode *inode; + struct nfs_lowner *owner; + bool notified; +}; + +static int +nfs4_wake_lock_waiter(wait_queue_t *wait, unsigned int mode, int flags, void *key) +{ + int ret; + struct cb_notify_lock_args *cbnl = key; + struct nfs4_lock_waiter *waiter = wait->private; + struct nfs_lowner *lowner = &cbnl->cbnl_owner, + *wowner = waiter->owner; + + /* Only wake if the callback was for the same owner */ + if (lowner->clientid != wowner->clientid || + lowner->id != wowner->id || + lowner->s_dev != wowner->s_dev) + return 0; + + /* Make sure it's for the right inode */ + if (nfs_compare_fh(NFS_FH(waiter->inode), &cbnl->cbnl_fh)) + return 0; + + waiter->notified = true; + + /* override "private" so we can use default_wake_function */ + wait->private = waiter->task; + ret = autoremove_wake_function(wait, mode, flags, key); + wait->private = waiter; + return ret; +} + +static int +nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) +{ + int status = -ERESTARTSYS; + unsigned long flags; + struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner; + struct nfs_server *server = NFS_SERVER(state->inode); + struct nfs_client *clp = server->nfs_client; + wait_queue_head_t *q = &clp->cl_lock_waitq; + struct nfs_lowner owner = { .clientid = clp->cl_clientid, + .id = lsp->ls_seqid.owner_id, + .s_dev = server->s_dev }; + struct nfs4_lock_waiter waiter = { .task = current, + .inode = state->inode, + .owner = &owner, + .notified = false }; + wait_queue_t wait; + + /* Don't bother with waitqueue if we don't expect a callback */ + if (!test_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags)) + return nfs4_retry_setlk_simple(state, cmd, request); + + init_wait(&wait); + wait.private = &waiter; + wait.func = nfs4_wake_lock_waiter; + add_wait_queue(q, &wait); + + while(!signalled()) { + status = nfs4_proc_setlk(state, cmd, request); + if ((status != -EAGAIN) || IS_SETLK(cmd)) + break; + + status = -ERESTARTSYS; + spin_lock_irqsave(&q->lock, flags); + if (waiter.notified) { + spin_unlock_irqrestore(&q->lock, flags); + continue; + } + set_current_state(TASK_INTERRUPTIBLE); + spin_unlock_irqrestore(&q->lock, flags); + + freezable_schedule_timeout_interruptible(NFS4_LOCK_MAXTIMEOUT); + } + + finish_wait(q, &wait); + return status; +} +#else /* !CONFIG_NFS_V4_1 */ +static inline int +nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) +{ + return nfs4_retry_setlk_simple(state, cmd, request); +} +#endif + static int nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request) { |