From 102a0743326a03cd1a1202ceda21e175b7d3575c Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 20 Feb 2024 01:20:52 +0000
Subject: [PATCH] add new system file
---
kernel/fs/locks.c | 25 ++++++++++++++++++++++++-
1 files changed, 24 insertions(+), 1 deletions(-)
diff --git a/kernel/fs/locks.c b/kernel/fs/locks.c
index 32c948f..cbb5701 100644
--- a/kernel/fs/locks.c
+++ b/kernel/fs/locks.c
@@ -1339,6 +1339,7 @@
out:
spin_unlock(&ctx->flc_lock);
percpu_up_read(&file_rwsem);
+ trace_posix_lock_inode(inode, request, error);
/*
* Free any unused locks.
*/
@@ -1347,7 +1348,6 @@
if (new_fl2)
locks_free_lock(new_fl2);
locks_dispose_list(&dispose);
- trace_posix_lock_inode(inode, request, error);
return error;
}
@@ -2813,6 +2813,29 @@
}
EXPORT_SYMBOL_GPL(vfs_cancel_lock);
+/**
+ * vfs_inode_has_locks - are any file locks held on @inode?
+ * @inode: inode to check for locks
+ *
+ * Return true if there are any FL_POSIX or FL_FLOCK locks currently
+ * set on @inode.
+ */
+bool vfs_inode_has_locks(struct inode *inode)
+{
+ struct file_lock_context *ctx;
+ bool ret;
+
+ ctx = smp_load_acquire(&inode->i_flctx);
+ if (!ctx)
+ return false;
+
+ spin_lock(&ctx->flc_lock);
+ ret = !list_empty(&ctx->flc_posix) || !list_empty(&ctx->flc_flock);
+ spin_unlock(&ctx->flc_lock);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(vfs_inode_has_locks);
+
#ifdef CONFIG_PROC_FS
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
--
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