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authorNeilBrown <neilb@suse.com>2018-11-30 02:04:08 +0300
committerJeff Layton <jlayton@kernel.org>2018-12-07 14:50:56 +0300
commitcb03f94ffb070b13bc0fa58b4ef4fdb558418d27 (patch)
tree6472abe321bfeef600939937f24cb423453847ad /fs/locks.c
parentfd7732e033e30b3a586923b57e338c859e17858a (diff)
downloadlinux-cb03f94ffb070b13bc0fa58b4ef4fdb558418d27.tar.xz
fs/locks: merge posix_unblock_lock() and locks_delete_block()
posix_unblock_lock() is not specific to posix locks, and behaves nearly identically to locks_delete_block() - the former returning a status while the later doesn't. So discard posix_unblock_lock() and use locks_delete_block() instead, after giving that function an appropriate return value. Signed-off-by: NeilBrown <neilb@suse.com> Reviewed-by: J. Bruce Fields <bfields@redhat.com> Signed-off-by: Jeff Layton <jlayton@kernel.org>
Diffstat (limited to 'fs/locks.c')
-rw-r--r--fs/locks.c38
1 files changed, 14 insertions, 24 deletions
diff --git a/fs/locks.c b/fs/locks.c
index 4d6a5a3f903a..75a03a9d666e 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -748,8 +748,16 @@ static void __locks_wake_up_blocks(struct file_lock *blocker)
}
}
-static void locks_delete_block(struct file_lock *waiter)
+/**
+ * locks_delete_lock - stop waiting for a file lock
+ * @waiter: the lock which was waiting
+ *
+ * lockd/nfsd need to disconnect the lock while working on it.
+ */
+int locks_delete_block(struct file_lock *waiter)
{
+ int status = -ENOENT;
+
/*
* If fl_blocker is NULL, it won't be set again as this thread
* "owns" the lock and is the only one that might try to claim
@@ -763,12 +771,16 @@ static void locks_delete_block(struct file_lock *waiter)
*/
if (waiter->fl_blocker == NULL &&
list_empty(&waiter->fl_blocked_requests))
- return;
+ return status;
spin_lock(&blocked_lock_lock);
+ if (waiter->fl_blocker)
+ status = 0;
__locks_wake_up_blocks(waiter);
__locks_delete_block(waiter);
spin_unlock(&blocked_lock_lock);
+ return status;
}
+EXPORT_SYMBOL(locks_delete_block);
/* Insert waiter into blocker's block list.
* We use a circular list so that processes can be easily woken up in
@@ -2676,28 +2688,6 @@ void locks_remove_file(struct file *filp)
}
/**
- * posix_unblock_lock - stop waiting for a file lock
- * @waiter: the lock which was waiting
- *
- * lockd needs to block waiting for locks.
- */
-int
-posix_unblock_lock(struct file_lock *waiter)
-{
- int status = -ENOENT;
-
- spin_lock(&blocked_lock_lock);
- if (waiter->fl_blocker) {
- __locks_wake_up_blocks(waiter);
- __locks_delete_block(waiter);
- status = 0;
- }
- spin_unlock(&blocked_lock_lock);
- return status;
-}
-EXPORT_SYMBOL(posix_unblock_lock);
-
-/**
* vfs_cancel_lock - file byte range unblock lock
* @filp: The file to apply the unblock to
* @fl: The lock to be unblocked