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authorDai Ngo <dai.ngo@oracle.com>2022-05-03 00:19:24 +0300
committerChuck Lever <chuck.lever@oracle.com>2022-05-19 19:25:39 +0300
commit591502c5cb325b1c6ec59ab161927d606b918aa0 (patch)
tree3fd2d5fa59419021c3cec2eff473dceb3d534c2d /fs/locks.c
parentd76cc46b37e123e8d245cc3490978dbda56f979d (diff)
downloadlinux-591502c5cb325b1c6ec59ab161927d606b918aa0.tar.xz
fs/lock: add helper locks_owner_has_blockers to check for blockers
Add helper locks_owner_has_blockers to check if there is any blockers for a given lockowner. Reviewed-by: J. Bruce Fields <bfields@fieldses.org> Signed-off-by: Dai Ngo <dai.ngo@oracle.com> Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Reviewed-by: Jeff Layton <jlayton@kernel.org>
Diffstat (limited to 'fs/locks.c')
-rw-r--r--fs/locks.c28
1 files changed, 28 insertions, 0 deletions
diff --git a/fs/locks.c b/fs/locks.c
index 8c6df10cd9ed..c369841ef7d1 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -300,6 +300,34 @@ void locks_release_private(struct file_lock *fl)
}
EXPORT_SYMBOL_GPL(locks_release_private);
+/**
+ * locks_owner_has_blockers - Check for blocking lock requests
+ * @flctx: file lock context
+ * @owner: lock owner
+ *
+ * Return values:
+ * %true: @owner has at least one blocker
+ * %false: @owner has no blockers
+ */
+bool locks_owner_has_blockers(struct file_lock_context *flctx,
+ fl_owner_t owner)
+{
+ struct file_lock *fl;
+
+ spin_lock(&flctx->flc_lock);
+ list_for_each_entry(fl, &flctx->flc_posix, fl_list) {
+ if (fl->fl_owner != owner)
+ continue;
+ if (!list_empty(&fl->fl_blocked_requests)) {
+ spin_unlock(&flctx->flc_lock);
+ return true;
+ }
+ }
+ spin_unlock(&flctx->flc_lock);
+ return false;
+}
+EXPORT_SYMBOL_GPL(locks_owner_has_blockers);
+
/* Free a lock which is not in use. */
void locks_free_lock(struct file_lock *fl)
{