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Diffstat (limited to 'fs/lockd/clntproc.c')
-rw-r--r--fs/lockd/clntproc.c276
1 files changed, 171 insertions, 105 deletions
diff --git a/fs/lockd/clntproc.c b/fs/lockd/clntproc.c
index b6b74a60e1e..acd39471634 100644
--- a/fs/lockd/clntproc.c
+++ b/fs/lockd/clntproc.c
@@ -7,6 +7,7 @@
*/
#include <linux/module.h>
+#include <linux/slab.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/fs.h>
@@ -16,7 +17,6 @@
#include <linux/sunrpc/clnt.h>
#include <linux/sunrpc/svc.h>
#include <linux/lockd/lockd.h>
-#include <linux/lockd/sm_inter.h>
#define NLMDBG_FACILITY NLMDBG_CLIENT
#define NLMCLNT_GRACE_WAIT (5*HZ)
@@ -58,7 +58,7 @@ static void nlm_put_lockowner(struct nlm_lockowner *lockowner)
return;
list_del(&lockowner->list);
spin_unlock(&lockowner->host->h_lock);
- nlm_release_host(lockowner->host);
+ nlmclnt_release_host(lockowner->host);
kfree(lockowner);
}
@@ -125,15 +125,15 @@ static void nlmclnt_setlockargs(struct nlm_rqst *req, struct file_lock *fl)
{
struct nlm_args *argp = &req->a_args;
struct nlm_lock *lock = &argp->lock;
+ char *nodename = req->a_host->h_rpcclnt->cl_nodename;
nlmclnt_next_cookie(&argp->cookie);
- argp->state = nsm_local_state;
- memcpy(&lock->fh, NFS_FH(fl->fl_file->f_path.dentry->d_inode), sizeof(struct nfs_fh));
- lock->caller = utsname()->nodename;
+ memcpy(&lock->fh, NFS_FH(file_inode(fl->fl_file)), sizeof(struct nfs_fh));
+ lock->caller = nodename;
lock->oh.data = req->a_owner;
lock->oh.len = snprintf(req->a_owner, sizeof(req->a_owner), "%u@%s",
(unsigned int)fl->fl_u.nfs_fl.owner->pid,
- utsname()->nodename);
+ nodename);
lock->svid = fl->fl_u.nfs_fl.owner->pid;
lock->fl.fl_start = fl->fl_start;
lock->fl.fl_end = fl->fl_end;
@@ -142,7 +142,7 @@ static void nlmclnt_setlockargs(struct nlm_rqst *req, struct file_lock *fl)
static void nlmclnt_release_lockargs(struct nlm_rqst *req)
{
- BUG_ON(req->a_args.lock.fl.fl_ops != NULL);
+ WARN_ON_ONCE(req->a_args.lock.fl.fl_ops != NULL);
}
/**
@@ -155,35 +155,21 @@ static void nlmclnt_release_lockargs(struct nlm_rqst *req)
int nlmclnt_proc(struct nlm_host *host, int cmd, struct file_lock *fl)
{
struct nlm_rqst *call;
- sigset_t oldset;
- unsigned long flags;
int status;
- nlm_get_host(host);
call = nlm_alloc_call(host);
if (call == NULL)
return -ENOMEM;
nlmclnt_locks_init_private(fl, host);
+ if (!fl->fl_u.nfs_fl.owner) {
+ /* lockowner allocation has failed */
+ nlmclnt_release_call(call);
+ return -ENOMEM;
+ }
/* Set up the argument struct */
nlmclnt_setlockargs(call, fl);
- /* Keep the old signal mask */
- spin_lock_irqsave(&current->sighand->siglock, flags);
- oldset = current->blocked;
-
- /* If we're cleaning up locks because the process is exiting,
- * perform the RPC call asynchronously. */
- if ((IS_SETLK(cmd) || IS_SETLKW(cmd))
- && fl->fl_type == F_UNLCK
- && (current->flags & PF_EXITING)) {
- sigfillset(&current->blocked); /* Mask all signals */
- recalc_sigpending();
-
- call->a_flags = RPC_TASK_ASYNC;
- }
- spin_unlock_irqrestore(&current->sighand->siglock, flags);
-
if (IS_SETLK(cmd) || IS_SETLKW(cmd)) {
if (fl->fl_type != F_UNLCK) {
call->a_args.block = IS_SETLKW(cmd) ? 1 : 0;
@@ -194,15 +180,9 @@ int nlmclnt_proc(struct nlm_host *host, int cmd, struct file_lock *fl)
status = nlmclnt_test(call, fl);
else
status = -EINVAL;
-
fl->fl_ops->fl_release_private(fl);
fl->fl_ops = NULL;
- spin_lock_irqsave(&current->sighand->siglock, flags);
- current->blocked = oldset;
- recalc_sigpending();
- spin_unlock_irqrestore(&current->sighand->siglock, flags);
-
dprintk("lockd: clnt proc returns %d\n", status);
return status;
}
@@ -210,9 +190,6 @@ EXPORT_SYMBOL_GPL(nlmclnt_proc);
/*
* Allocate an NLM RPC call struct
- *
- * Note: the caller must hold a reference to host. In case of failure,
- * this reference will be released.
*/
struct nlm_rqst *nlm_alloc_call(struct nlm_host *host)
{
@@ -221,9 +198,10 @@ struct nlm_rqst *nlm_alloc_call(struct nlm_host *host)
for(;;) {
call = kzalloc(sizeof(*call), GFP_KERNEL);
if (call != NULL) {
+ atomic_set(&call->a_count, 1);
locks_init_lock(&call->a_args.lock.fl);
locks_init_lock(&call->a_res.lock.fl);
- call->a_host = host;
+ call->a_host = nlm_get_host(host);
return call;
}
if (signalled())
@@ -231,20 +209,21 @@ struct nlm_rqst *nlm_alloc_call(struct nlm_host *host)
printk("nlm_alloc_call: failed, waiting for memory\n");
schedule_timeout_interruptible(5*HZ);
}
- nlm_release_host(host);
return NULL;
}
-void nlm_release_call(struct nlm_rqst *call)
+void nlmclnt_release_call(struct nlm_rqst *call)
{
- nlm_release_host(call->a_host);
+ if (!atomic_dec_and_test(&call->a_count))
+ return;
+ nlmclnt_release_host(call->a_host);
nlmclnt_release_lockargs(call);
kfree(call);
}
static void nlmclnt_rpc_release(void *data)
{
- nlm_release_call(data);
+ nlmclnt_release_call(data);
}
static int nlm_wait_on_grace(wait_queue_head_t *queue)
@@ -267,7 +246,7 @@ static int nlm_wait_on_grace(wait_queue_head_t *queue)
* Generic NLM call
*/
static int
-nlmclnt_call(struct nlm_rqst *req, u32 proc)
+nlmclnt_call(struct rpc_cred *cred, struct nlm_rqst *req, u32 proc)
{
struct nlm_host *host = req->a_host;
struct rpc_clnt *clnt;
@@ -276,6 +255,7 @@ nlmclnt_call(struct nlm_rqst *req, u32 proc)
struct rpc_message msg = {
.rpc_argp = argp,
.rpc_resp = resp,
+ .rpc_cred = cred,
};
int status;
@@ -323,7 +303,8 @@ nlmclnt_call(struct nlm_rqst *req, u32 proc)
/* We appear to be out of the grace period */
wake_up_all(&host->h_gracewait);
}
- dprintk("lockd: server returns status %d\n", resp->status);
+ dprintk("lockd: server returns status %d\n",
+ ntohl(resp->status));
return 0; /* Okay, call complete */
}
@@ -343,10 +324,16 @@ in_grace_period:
/*
* Generic NLM call, async version.
*/
-static int __nlm_async_call(struct nlm_rqst *req, u32 proc, struct rpc_message *msg, const struct rpc_call_ops *tk_ops)
+static struct rpc_task *__nlm_async_call(struct nlm_rqst *req, u32 proc, struct rpc_message *msg, const struct rpc_call_ops *tk_ops)
{
struct nlm_host *host = req->a_host;
struct rpc_clnt *clnt;
+ struct rpc_task_setup task_setup_data = {
+ .rpc_message = msg,
+ .callback_ops = tk_ops,
+ .callback_data = req,
+ .flags = RPC_TASK_ASYNC,
+ };
dprintk("lockd: call procedure %d on %s (async)\n",
(int)proc, host->h_name);
@@ -356,21 +343,36 @@ static int __nlm_async_call(struct nlm_rqst *req, u32 proc, struct rpc_message *
if (clnt == NULL)
goto out_err;
msg->rpc_proc = &clnt->cl_procinfo[proc];
+ task_setup_data.rpc_client = clnt;
/* bootstrap and kick off the async RPC call */
- return rpc_call_async(clnt, msg, RPC_TASK_ASYNC, tk_ops, req);
+ return rpc_run_task(&task_setup_data);
out_err:
tk_ops->rpc_release(req);
- return -ENOLCK;
+ return ERR_PTR(-ENOLCK);
+}
+
+static int nlm_do_async_call(struct nlm_rqst *req, u32 proc, struct rpc_message *msg, const struct rpc_call_ops *tk_ops)
+{
+ struct rpc_task *task;
+
+ task = __nlm_async_call(req, proc, msg, tk_ops);
+ if (IS_ERR(task))
+ return PTR_ERR(task);
+ rpc_put_task(task);
+ return 0;
}
+/*
+ * NLM asynchronous call.
+ */
int nlm_async_call(struct nlm_rqst *req, u32 proc, const struct rpc_call_ops *tk_ops)
{
struct rpc_message msg = {
.rpc_argp = &req->a_args,
.rpc_resp = &req->a_res,
};
- return __nlm_async_call(req, proc, &msg, tk_ops);
+ return nlm_do_async_call(req, proc, &msg, tk_ops);
}
int nlm_async_reply(struct nlm_rqst *req, u32 proc, const struct rpc_call_ops *tk_ops)
@@ -378,7 +380,33 @@ int nlm_async_reply(struct nlm_rqst *req, u32 proc, const struct rpc_call_ops *t
struct rpc_message msg = {
.rpc_argp = &req->a_res,
};
- return __nlm_async_call(req, proc, &msg, tk_ops);
+ return nlm_do_async_call(req, proc, &msg, tk_ops);
+}
+
+/*
+ * NLM client asynchronous call.
+ *
+ * Note that although the calls are asynchronous, and are therefore
+ * guaranteed to complete, we still always attempt to wait for
+ * completion in order to be able to correctly track the lock
+ * state.
+ */
+static int nlmclnt_async_call(struct rpc_cred *cred, struct nlm_rqst *req, u32 proc, const struct rpc_call_ops *tk_ops)
+{
+ struct rpc_message msg = {
+ .rpc_argp = &req->a_args,
+ .rpc_resp = &req->a_res,
+ .rpc_cred = cred,
+ };
+ struct rpc_task *task;
+ int err;
+
+ task = __nlm_async_call(req, proc, &msg, tk_ops);
+ if (IS_ERR(task))
+ return PTR_ERR(task);
+ err = rpc_wait_for_completion_task(task);
+ rpc_put_task(task);
+ return err;
}
/*
@@ -389,7 +417,7 @@ nlmclnt_test(struct nlm_rqst *req, struct file_lock *fl)
{
int status;
- status = nlmclnt_call(req, NLMPROC_TEST);
+ status = nlmclnt_call(nfs_file_cred(fl->fl_file), req, NLMPROC_TEST);
if (status < 0)
goto out;
@@ -402,7 +430,7 @@ nlmclnt_test(struct nlm_rqst *req, struct file_lock *fl)
* Report the conflicting lock back to the application.
*/
fl->fl_start = req->a_res.lock.fl.fl_start;
- fl->fl_end = req->a_res.lock.fl.fl_start;
+ fl->fl_end = req->a_res.lock.fl.fl_end;
fl->fl_type = req->a_res.lock.fl.fl_type;
fl->fl_pid = 0;
break;
@@ -410,31 +438,34 @@ nlmclnt_test(struct nlm_rqst *req, struct file_lock *fl)
status = nlm_stat_to_errno(req->a_res.status);
}
out:
- nlm_release_call(req);
+ nlmclnt_release_call(req);
return status;
}
static void nlmclnt_locks_copy_lock(struct file_lock *new, struct file_lock *fl)
{
+ spin_lock(&fl->fl_u.nfs_fl.owner->host->h_lock);
new->fl_u.nfs_fl.state = fl->fl_u.nfs_fl.state;
new->fl_u.nfs_fl.owner = nlm_get_lockowner(fl->fl_u.nfs_fl.owner);
list_add_tail(&new->fl_u.nfs_fl.list, &fl->fl_u.nfs_fl.owner->host->h_granted);
+ spin_unlock(&fl->fl_u.nfs_fl.owner->host->h_lock);
}
static void nlmclnt_locks_release_private(struct file_lock *fl)
{
+ spin_lock(&fl->fl_u.nfs_fl.owner->host->h_lock);
list_del(&fl->fl_u.nfs_fl.list);
+ spin_unlock(&fl->fl_u.nfs_fl.owner->host->h_lock);
nlm_put_lockowner(fl->fl_u.nfs_fl.owner);
}
-static struct file_lock_operations nlmclnt_lock_ops = {
+static const struct file_lock_operations nlmclnt_lock_ops = {
.fl_copy_lock = nlmclnt_locks_copy_lock,
.fl_release_private = nlmclnt_locks_release_private,
};
static void nlmclnt_locks_init_private(struct file_lock *fl, struct nlm_host *host)
{
- BUG_ON(fl->fl_ops != NULL);
fl->fl_u.nfs_fl.state = 0;
fl->fl_u.nfs_fl.owner = nlm_find_lockowner(host, fl->fl_owner);
INIT_LIST_HEAD(&fl->fl_u.nfs_fl.list);
@@ -480,31 +511,36 @@ static int do_vfs_lock(struct file_lock *fl)
static int
nlmclnt_lock(struct nlm_rqst *req, struct file_lock *fl)
{
+ struct rpc_cred *cred = nfs_file_cred(fl->fl_file);
struct nlm_host *host = req->a_host;
struct nlm_res *resp = &req->a_res;
struct nlm_wait *block = NULL;
unsigned char fl_flags = fl->fl_flags;
+ unsigned char fl_type;
int status = -ENOLCK;
- if (nsm_monitor(host) < 0) {
- printk(KERN_NOTICE "lockd: failed to monitor %s\n",
- host->h_name);
+ if (nsm_monitor(host) < 0)
goto out;
- }
+ req->a_args.state = nsm_local_state;
+
fl->fl_flags |= FL_ACCESS;
status = do_vfs_lock(fl);
+ fl->fl_flags = fl_flags;
if (status < 0)
goto out;
block = nlmclnt_prepare_block(host, fl);
again:
+ /*
+ * Initialise resp->status to a valid non-zero value,
+ * since 0 == nlm_lck_granted
+ */
+ resp->status = nlm_lck_blocked;
for(;;) {
/* Reboot protection */
fl->fl_u.nfs_fl.state = host->h_state;
- status = nlmclnt_call(req, NLMPROC_LOCK);
+ status = nlmclnt_call(cred, req, NLMPROC_LOCK);
if (status < 0)
- goto out_unblock;
- if (!req->a_args.block)
break;
/* Did a reclaimer thread notify us of a server reboot? */
if (resp->status == nlm_lck_denied_grace_period)
@@ -513,15 +549,22 @@ again:
break;
/* Wait on an NLM blocking lock */
status = nlmclnt_block(block, req, NLMCLNT_POLL_TIMEOUT);
- /* if we were interrupted. Send a CANCEL request to the server
- * and exit
- */
if (status < 0)
- goto out_unblock;
+ break;
if (resp->status != nlm_lck_blocked)
break;
}
+ /* if we were interrupted while blocking, then cancel the lock request
+ * and exit
+ */
+ if (resp->status == nlm_lck_blocked) {
+ if (!req->a_args.block)
+ goto out_unlock;
+ if (nlmclnt_cancel(host, req->a_args.block, fl) == 0)
+ goto out_unblock;
+ }
+
if (resp->status == nlm_granted) {
down_read(&host->h_rwsem);
/* Check whether or not the server has rebooted */
@@ -530,20 +573,42 @@ again:
goto again;
}
/* Ensure the resulting lock will get added to granted list */
- fl->fl_flags = fl_flags | FL_SLEEP;
+ fl->fl_flags |= FL_SLEEP;
if (do_vfs_lock(fl) < 0)
- printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__);
+ printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __func__);
up_read(&host->h_rwsem);
+ fl->fl_flags = fl_flags;
+ status = 0;
}
- status = nlm_stat_to_errno(resp->status);
+ if (status < 0)
+ goto out_unlock;
+ /*
+ * EAGAIN doesn't make sense for sleeping locks, and in some
+ * cases NLM_LCK_DENIED is returned for a permanent error. So
+ * turn it into an ENOLCK.
+ */
+ if (resp->status == nlm_lck_denied && (fl_flags & FL_SLEEP))
+ status = -ENOLCK;
+ else
+ status = nlm_stat_to_errno(resp->status);
out_unblock:
nlmclnt_finish_block(block);
- /* Cancel the blocked request if it is still pending */
- if (resp->status == nlm_lck_blocked)
- nlmclnt_cancel(host, req->a_args.block, fl);
out:
- nlm_release_call(req);
+ nlmclnt_release_call(req);
+ return status;
+out_unlock:
+ /* Fatal error: ensure that we remove the lock altogether */
+ dprintk("lockd: lock attempt ended in fatal error.\n"
+ " Attempting to unlock.\n");
+ nlmclnt_finish_block(block);
+ fl_type = fl->fl_type;
+ fl->fl_type = F_UNLCK;
+ down_read(&host->h_rwsem);
+ do_vfs_lock(fl);
+ up_read(&host->h_rwsem);
+ fl->fl_type = fl_type;
fl->fl_flags = fl_flags;
+ nlmclnt_async_call(cred, req, NLMPROC_UNLOCK, &nlmclnt_unlock_ops);
return status;
}
@@ -551,24 +616,22 @@ out:
* RECLAIM: Try to reclaim a lock
*/
int
-nlmclnt_reclaim(struct nlm_host *host, struct file_lock *fl)
+nlmclnt_reclaim(struct nlm_host *host, struct file_lock *fl,
+ struct nlm_rqst *req)
{
- struct nlm_rqst reqst, *req;
int status;
- req = &reqst;
memset(req, 0, sizeof(*req));
locks_init_lock(&req->a_args.lock.fl);
locks_init_lock(&req->a_res.lock.fl);
req->a_host = host;
- req->a_flags = 0;
/* Set up the argument struct */
nlmclnt_setlockargs(req, fl);
req->a_args.reclaim = 1;
- if ((status = nlmclnt_call(req, NLMPROC_LOCK)) >= 0
- && req->a_res.status == nlm_granted)
+ status = nlmclnt_call(nfs_file_cred(fl->fl_file), req, NLMPROC_LOCK);
+ if (status >= 0 && req->a_res.status == nlm_granted)
return 0;
printk(KERN_WARNING "lockd: failed to reclaim lock for pid %d "
@@ -598,7 +661,8 @@ nlmclnt_unlock(struct nlm_rqst *req, struct file_lock *fl)
{
struct nlm_host *host = req->a_host;
struct nlm_res *resp = &req->a_res;
- int status = 0;
+ int status;
+ unsigned char fl_flags = fl->fl_flags;
/*
* Note: the server is supposed to either grant us the unlock
@@ -607,16 +671,17 @@ nlmclnt_unlock(struct nlm_rqst *req, struct file_lock *fl)
*/
fl->fl_flags |= FL_EXISTS;
down_read(&host->h_rwsem);
- if (do_vfs_lock(fl) == -ENOENT) {
- up_read(&host->h_rwsem);
+ status = do_vfs_lock(fl);
+ up_read(&host->h_rwsem);
+ fl->fl_flags = fl_flags;
+ if (status == -ENOENT) {
+ status = 0;
goto out;
}
- up_read(&host->h_rwsem);
- if (req->a_flags & RPC_TASK_ASYNC)
- return nlm_async_call(req, NLMPROC_UNLOCK, &nlmclnt_unlock_ops);
-
- status = nlmclnt_call(req, NLMPROC_UNLOCK);
+ atomic_inc(&req->a_count);
+ status = nlmclnt_async_call(nfs_file_cred(fl->fl_file), req,
+ NLMPROC_UNLOCK, &nlmclnt_unlock_ops);
if (status < 0)
goto out;
@@ -624,11 +689,12 @@ nlmclnt_unlock(struct nlm_rqst *req, struct file_lock *fl)
goto out;
if (resp->status != nlm_lck_denied_nolocks)
- printk("lockd: unexpected unlock status: %d\n", resp->status);
+ printk("lockd: unexpected unlock status: %d\n",
+ ntohl(resp->status));
/* What to do now? I'm out of my depth... */
status = -ENOLCK;
out:
- nlm_release_call(req);
+ nlmclnt_release_call(req);
return status;
}
@@ -642,7 +708,13 @@ static void nlmclnt_unlock_callback(struct rpc_task *task, void *data)
if (task->tk_status < 0) {
dprintk("lockd: unlock failed (err = %d)\n", -task->tk_status);
- goto retry_rebind;
+ switch (task->tk_status) {
+ case -EACCES:
+ case -EIO:
+ goto die;
+ default:
+ goto retry_rebind;
+ }
}
if (status == NLM_LCK_DENIED_GRACE_PERIOD) {
rpc_delay(task, NLMCLNT_GRACE_WAIT);
@@ -671,18 +743,12 @@ static const struct rpc_call_ops nlmclnt_unlock_ops = {
static int nlmclnt_cancel(struct nlm_host *host, int block, struct file_lock *fl)
{
struct nlm_rqst *req;
- unsigned long flags;
- sigset_t oldset;
- int status;
+ int status;
- /* Block all signals while setting up call */
- spin_lock_irqsave(&current->sighand->siglock, flags);
- oldset = current->blocked;
- sigfillset(&current->blocked);
- recalc_sigpending();
- spin_unlock_irqrestore(&current->sighand->siglock, flags);
+ dprintk("lockd: blocking lock attempt was interrupted by a signal.\n"
+ " Attempting to cancel lock.\n");
- req = nlm_alloc_call(nlm_get_host(host));
+ req = nlm_alloc_call(host);
if (!req)
return -ENOMEM;
req->a_flags = RPC_TASK_ASYNC;
@@ -690,13 +756,12 @@ static int nlmclnt_cancel(struct nlm_host *host, int block, struct file_lock *fl
nlmclnt_setlockargs(req, fl);
req->a_args.block = block;
- status = nlm_async_call(req, NLMPROC_CANCEL, &nlmclnt_cancel_ops);
-
- spin_lock_irqsave(&current->sighand->siglock, flags);
- current->blocked = oldset;
- recalc_sigpending();
- spin_unlock_irqrestore(&current->sighand->siglock, flags);
-
+ atomic_inc(&req->a_count);
+ status = nlmclnt_async_call(nfs_file_cred(fl->fl_file), req,
+ NLMPROC_CANCEL, &nlmclnt_cancel_ops);
+ if (status == 0 && req->a_res.status == nlm_lck_denied)
+ status = -ENOLCK;
+ nlmclnt_release_call(req);
return status;
}
@@ -778,6 +843,7 @@ nlm_stat_to_errno(__be32 status)
return -ENOLCK;
#endif
}
- printk(KERN_NOTICE "lockd: unexpected server status %d\n", status);
+ printk(KERN_NOTICE "lockd: unexpected server status %d\n",
+ ntohl(status));
return -ENOLCK;
}