* 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 */
u32 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)
+int nlmclnt_prepare_block(struct nlm_rqst *req, struct nlm_host *host, struct file_lock *fl)
{
- struct nlm_wait block, **head;
- int err;
- u32 pstate;
+ struct nlm_wait *block;
+
+ BUG_ON(req->a_block != NULL);
+ block = kmalloc(sizeof(*block), GFP_KERNEL);
+ if (block == NULL)
+ return -ENOMEM;
+ block->b_host = host;
+ block->b_lock = fl;
+ init_waitqueue_head(&block->b_wait);
+ block->b_status = NLM_LCK_BLOCKED;
- 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 = █
+ list_add(&block->b_list, &nlm_blocked);
+ req->a_block = block;
+
+ return 0;
+}
- /* Remember pseudo nsm state */
- pstate = host->h_state;
+void nlmclnt_finish_block(struct nlm_rqst *req)
+{
+ struct nlm_wait *block = req->a_block;
+
+ if (block == NULL)
+ return;
+ req->a_block = NULL;
+ list_del(&block->b_list);
+ kfree(block);
+}
+
+/*
+ * Block on a lock
+ */
+long nlmclnt_block(struct nlm_rqst *req, long timeout)
+{
+ struct nlm_wait *block = req->a_block;
+ long ret;
+
+ /* A borken server might ask us to block even if we didn't
+ * request it. Just say no!
+ */
+ if (!req->a_args.block)
+ 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;
- }
- }
+ ret = wait_event_interruptible_timeout(block->b_wait,
+ block->b_status != NLM_LCK_BLOCKED,
+ timeout);
- if (!signalled()) {
- *statp = block.b_status;
- return 0;
+ if (block->b_status != NLM_LCK_BLOCKED) {
+ req->a_res.status = block->b_status;
+ block->b_status = NLM_LCK_BLOCKED;
}
- /* 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;
+ return ret;
}
/*
* The server lockd has called us back to tell us the lock was granted
*/
-u32
-nlmclnt_grant(struct nlm_lock *lock)
+u32 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;
+ u32 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;
+ list_for_each_entry(block, &nlm_blocked, b_list) {
+ struct file_lock *fl_blocked = block->b_lock;
- /* 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;
+ if (!nlm_compare_locks(fl_blocked, fl))
+ continue;
+ if (!nlm_cmp_addr(&block->b_host->h_addr, addr))
+ continue;
+ if (nfs_compare_fh(NFS_FH(fl_blocked->fl_file->f_dentry->d_inode) ,fh) != 0)
+ continue;
+ /* Alright, we found a lock. Set the return status
+ * and wake up the caller
+ */
+ block->b_status = NLM_LCK_GRANTED;
+ wake_up(&block->b_wait);
+ res = nlm_granted;
+ }
+ return res;
}
/*
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)
+ if (fl->fl_u.nfs_fl.owner == NULL)
+ continue;
+ if (fl->fl_u.nfs_fl.owner->host != host)
continue;
if (!(fl->fl_u.nfs_fl.flags & NFS_LCK_GRANTED))
continue;
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)
+ if (fl->fl_u.nfs_fl.owner == NULL)
+ continue;
+ if (fl->fl_u.nfs_fl.owner->host != host)
continue;
if (!(fl->fl_u.nfs_fl.flags & NFS_LCK_RECLAIM))
continue;
host->h_reclaiming = 0;
/* 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;
wake_up(&block->b_wait);
git://git.onelab.eu / linux-2.6.git / blobdiff