fasync: re-organize fasync entry insertion to allow it under a spinlock

[linux-2.6-block.git] / fs / locks.c

diff --git a/fs/locks.c b/fs/locks.c
index 0391d2ff5a4ed859ca19c5fa65964ddd1c6d85f8..85fd9ce1abae6d97ca92fa3b2884c8732a169a60 100644 (file)
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -1505,6 +1505,7 @@ EXPORT_SYMBOL_GPL(vfs_setlease);
 int fcntl_setlease(unsigned int fd, struct file *filp, long arg)
 {
        struct file_lock *fl;
+       struct fasync_struct *new;
        struct inode *inode = filp->f_path.dentry->d_inode;
        int error;
 
@@ -1512,12 +1513,25 @@ int fcntl_setlease(unsigned int fd, struct file *filp, long arg)
        if (IS_ERR(fl))
                return PTR_ERR(fl);
 
+       new = fasync_alloc();
+       if (!new) {
+               locks_free_lock(fl);
+               return -ENOMEM;
+       }
        lock_flocks();
        error = __vfs_setlease(filp, arg, &fl);
        if (error || arg == F_UNLCK)
                goto out_unlock;
 
-       error = fasync_helper(fd, filp, 1, &fl->fl_fasync);
+       /*
+        * fasync_insert_entry() returns the old entry if any.
+        * If there was no old entry, then it used 'new' and
+        * inserted it into the fasync list. Clear new so that
+        * we don't release it here.
+        */
+       if (!fasync_insert_entry(fd, filp, &fl->fl_fasync, new))
+               new = NULL;
+
        if (error < 0) {
                /* remove lease just inserted by setlease */
                fl->fl_type = F_UNLCK | F_INPROGRESS;
@@ -1529,6 +1543,8 @@ int fcntl_setlease(unsigned int fd, struct file *filp, long arg)
        error = __f_setown(filp, task_pid(current), PIDTYPE_PID, 0);
 out_unlock:
        unlock_flocks();
+       if (new)
+               fasync_free(new);
        return error;
 }