* This is the representation of a blocked client lock.
*/
struct nlm_wait {
- struct nlm_wait * b_next; /* linked list */
+ struct list_head b_list; /* linked list */
wait_queue_head_t b_wait; /* where to wait on */
struct nlm_host * b_host;
struct file_lock * b_lock; /* local file lock */
unsigned short b_reclaim; /* got to reclaim lock */
- u32 b_status; /* grant callback status */
+ __be32 b_status; /* grant callback status */
};
-static struct nlm_wait * nlm_blocked;
+static LIST_HEAD(nlm_blocked);
/*
- * Block on a lock
+ * Queue up a lock for blocking so that the GRANTED request can see it
*/
-int
-nlmclnt_block(struct nlm_host *host, struct file_lock *fl, u32 *statp)
+struct nlm_wait *nlmclnt_prepare_block(struct nlm_host *host, struct file_lock *fl)
{
- struct nlm_wait block, **head;
- int err;
- u32 pstate;
+ struct nlm_wait *block;
+
+ block = kmalloc(sizeof(*block), GFP_KERNEL);
+ if (block != NULL) {
+ block->b_host = host;
+ block->b_lock = fl;
+ init_waitqueue_head(&block->b_wait);
+ block->b_status = nlm_lck_blocked;
+ list_add(&block->b_list, &nlm_blocked);
+ }
+ return block;
+}
+
+void nlmclnt_finish_block(struct nlm_wait *block)
+{
+ if (block == NULL)
+ return;
+ list_del(&block->b_list);
+ kfree(block);
+}
- block.b_host = host;
- block.b_lock = fl;
- init_waitqueue_head(&block.b_wait);
- block.b_status = NLM_LCK_BLOCKED;
- block.b_next = nlm_blocked;
- nlm_blocked = █
+/*
+ * Block on a lock
+ */
+int nlmclnt_block(struct nlm_wait *block, struct nlm_rqst *req, long timeout)
+{
+ long ret;
- /* Remember pseudo nsm state */
- pstate = host->h_state;
+ /* A borken server might ask us to block even if we didn't
+ * request it. Just say no!
+ */
+ if (block == NULL)
+ return -EAGAIN;
/* Go to sleep waiting for GRANT callback. Some servers seem
* to lose callbacks, however, so we're going to poll from
* a 1 minute timeout would do. See the comment before
* nlmclnt_lock for an explanation.
*/
- sleep_on_timeout(&block.b_wait, 30*HZ);
-
- for (head = &nlm_blocked; *head; head = &(*head)->b_next) {
- if (*head == &block) {
- *head = block.b_next;
- break;
- }
- }
-
- if (!signalled()) {
- *statp = block.b_status;
- return 0;
- }
-
- /* Okay, we were interrupted. Cancel the pending request
- * unless the server has rebooted.
- */
- if (pstate == host->h_state && (err = nlmclnt_cancel(host, fl)) < 0)
- printk(KERN_NOTICE
- "lockd: CANCEL call failed (errno %d)\n", -err);
-
- return -ERESTARTSYS;
+ ret = wait_event_interruptible_timeout(block->b_wait,
+ block->b_status != nlm_lck_blocked,
+ timeout);
+ if (ret < 0)
+ return -ERESTARTSYS;
+ req->a_res.status = block->b_status;
+ return 0;
}
/*
* The server lockd has called us back to tell us the lock was granted
*/
-u32
-nlmclnt_grant(struct nlm_lock *lock)
+__be32 nlmclnt_grant(const struct sockaddr_in *addr, const struct nlm_lock *lock)
{
+ const struct file_lock *fl = &lock->fl;
+ const struct nfs_fh *fh = &lock->fh;
struct nlm_wait *block;
+ __be32 res = nlm_lck_denied;
/*
* Look up blocked request based on arguments.
* Warning: must not use cookie to match it!
*/
- for (block = nlm_blocked; block; block = block->b_next) {
- if (nlm_compare_locks(block->b_lock, &lock->fl))
- break;
- }
-
- /* Ooops, no blocked request found. */
- if (block == NULL)
- return nlm_lck_denied;
-
- /* Alright, we found the lock. Set the return status and
- * wake up the caller.
- */
- block->b_status = NLM_LCK_GRANTED;
- wake_up(&block->b_wait);
-
- return nlm_granted;
-}
+ list_for_each_entry(block, &nlm_blocked, b_list) {
+ struct file_lock *fl_blocked = block->b_lock;
-/*
- * The following procedures deal with the recovery of locks after a
- * server crash.
- */
-
-/*
- * Mark the locks for reclaiming.
- * FIXME: In 2.5 we don't want to iterate through any global file_lock_list.
- * Maintain NLM lock reclaiming lists in the nlm_host instead.
- */
-static
-void nlmclnt_mark_reclaim(struct nlm_host *host)
-{
- struct file_lock *fl;
- struct inode *inode;
- struct list_head *tmp;
-
- list_for_each(tmp, &file_lock_list) {
- fl = list_entry(tmp, struct file_lock, fl_link);
-
- inode = fl->fl_file->f_dentry->d_inode;
- if (inode->i_sb->s_magic != NFS_SUPER_MAGIC)
+ if (fl_blocked->fl_start != fl->fl_start)
+ continue;
+ if (fl_blocked->fl_end != fl->fl_end)
continue;
- if (fl->fl_u.nfs_fl.host != host)
+ /*
+ * Careful! The NLM server will return the 32-bit "pid" that
+ * we put on the wire: in this case the lockowner "pid".
+ */
+ if (fl_blocked->fl_u.nfs_fl.owner->pid != lock->svid)
continue;
- if (!(fl->fl_u.nfs_fl.flags & NFS_LCK_GRANTED))
+ if (!nlm_cmp_addr(&block->b_host->h_addr, addr))
continue;
- fl->fl_u.nfs_fl.flags |= NFS_LCK_RECLAIM;
+ if (nfs_compare_fh(NFS_FH(fl_blocked->fl_file->f_path.dentry->d_inode) ,fh) != 0)
+ continue;
+ /* Alright, we found a lock. Set the return status
+ * and wake up the caller
+ */
+ block->b_status = nlm_granted;
+ wake_up(&block->b_wait);
+ res = nlm_granted;
}
+ return res;
}
/*
- * Someone has sent us an SM_NOTIFY. Ensure we bind to the new port number,
- * that we mark locks for reclaiming, and that we bump the pseudo NSM state.
+ * The following procedures deal with the recovery of locks after a
+ * server crash.
*/
-static inline
-void nlmclnt_prepare_reclaim(struct nlm_host *host, u32 newstate)
-{
- host->h_monitored = 0;
- host->h_nsmstate = newstate;
- host->h_state++;
- host->h_nextrebind = 0;
- nlm_rebind_host(host);
- nlmclnt_mark_reclaim(host);
- dprintk("NLM: reclaiming locks for host %s", host->h_name);
-}
/*
* Reclaim all locks on server host. We do this by spawning a separate
* reclaimer thread.
*/
void
-nlmclnt_recovery(struct nlm_host *host, u32 newstate)
+nlmclnt_recovery(struct nlm_host *host)
{
- if (host->h_reclaiming++) {
- if (host->h_nsmstate == newstate)
- return;
- nlmclnt_prepare_reclaim(host, newstate);
- } else {
- nlmclnt_prepare_reclaim(host, newstate);
+ if (!host->h_reclaiming++) {
nlm_get_host(host);
__module_get(THIS_MODULE);
if (kernel_thread(reclaimer, host, CLONE_KERNEL) < 0)
{
struct nlm_host *host = (struct nlm_host *) ptr;
struct nlm_wait *block;
- struct list_head *tmp;
- struct file_lock *fl;
- struct inode *inode;
+ struct file_lock *fl, *next;
+ u32 nsmstate;
daemonize("%s-reclaim", host->h_name);
allow_signal(SIGKILL);
+ down_write(&host->h_rwsem);
+
/* This one ensures that our parent doesn't terminate while the
* reclaim is in progress */
lock_kernel();
- lockd_up();
+ lockd_up(0); /* note: this cannot fail as lockd is already running */
+
+ dprintk("lockd: reclaiming locks for host %s\n", host->h_name);
- /* First, reclaim all locks that have been marked. */
restart:
- list_for_each(tmp, &file_lock_list) {
- fl = list_entry(tmp, struct file_lock, fl_link);
+ nsmstate = host->h_nsmstate;
- inode = fl->fl_file->f_dentry->d_inode;
- if (inode->i_sb->s_magic != NFS_SUPER_MAGIC)
- continue;
- if (fl->fl_u.nfs_fl.host != host)
- continue;
- if (!(fl->fl_u.nfs_fl.flags & NFS_LCK_RECLAIM))
- continue;
+ /* Force a portmap getport - the peer's lockd will
+ * most likely end up on a different port.
+ */
+ host->h_nextrebind = jiffies;
+ nlm_rebind_host(host);
+
+ /* First, reclaim all locks that have been granted. */
+ list_splice_init(&host->h_granted, &host->h_reclaim);
+ list_for_each_entry_safe(fl, next, &host->h_reclaim, fl_u.nfs_fl.list) {
+ list_del_init(&fl->fl_u.nfs_fl.list);
- fl->fl_u.nfs_fl.flags &= ~NFS_LCK_RECLAIM;
- nlmclnt_reclaim(host, fl);
+ /* Why are we leaking memory here? --okir */
if (signalled())
- break;
- goto restart;
+ continue;
+ if (nlmclnt_reclaim(host, fl) != 0)
+ continue;
+ list_add_tail(&fl->fl_u.nfs_fl.list, &host->h_granted);
+ if (host->h_nsmstate != nsmstate) {
+ /* Argh! The server rebooted again! */
+ goto restart;
+ }
}
host->h_reclaiming = 0;
+ up_write(&host->h_rwsem);
+ dprintk("NLM: done reclaiming locks for host %s\n", host->h_name);
/* Now, wake up all processes that sleep on a blocked lock */
- for (block = nlm_blocked; block; block = block->b_next) {
+ list_for_each_entry(block, &nlm_blocked, b_list) {
if (block->b_host == host) {
- block->b_status = NLM_LCK_DENIED_GRACE_PERIOD;
+ block->b_status = nlm_lck_denied_grace_period;
wake_up(&block->b_wait);
}
}
git://git.onelab.eu / linux-2.6.git / blobdiff