linux-kernel - [PATCH] fs: {lock,unlock}_flocks() stubs to prepare for BKL removal

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Message-ID: <Pine.LNX.4.64.1009211438010.18094@cobra.newdream.net>
Date:	Tue, 21 Sep 2010 16:24:37 -0700 (PDT)
From:	Sage Weil <sage@...dream.net>
To:	torvalds@...ux-foundation.org
cc:	Arnd Bergmann <arnd@...db.de>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-kernel@...r.kernel.org,
	Matthew Wilcox <willy@...ux.intel.com>,
	Christoph Hellwig <hch@....de>,
	Trond Myklebust <trond.myklebust@....uio.no>,
	"J. Bruce Fields" <bfields@...ldses.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Miklos Szeredi <mszeredi@...e.cz>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>, John Kacur <jkacur@...hat.com>,
	linux-fsdevel@...r.kernel.org, gregf@...newdream.net
Subject: [PATCH] fs: {lock,unlock}_flocks() stubs to prepare for BKL removal

Hi Linus,

The locking for fs/locks.c will be switching to a new interface in 
preparation for BKL removal.  Getting these stubs upstream prior to the 
merge window will make it a bit easier for subsystems to make the 
necessary changes (non-trivial, in Ceph's case), test in linux-next 
without conflicts, and avoid worrying about the order in which things are 
pulled for 2.6.37.

Would you mind taking the patch below now?

Thanks!
sage

---

From: Sage Weil <sage@...dream.net>
Date: Tue, 21 Sep 2010 14:35:37 -0700
Subject: [PATCH] fs: {lock,unlock}_flocks() stubs to prepare for BKL removal

The lock structs are currently protected by the BKL, but are accessed by
code in fs/locks.c and misc file system and DLM code.  These stubs will
allow all users to switch to the new interface before the implementation
is changed to a spinlock.

Acked-by: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Sage Weil <sage@...dream.net>
---
 include/linux/fs.h |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 76041b6..63d069b 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1093,6 +1093,10 @@ struct file_lock {
 
 #include <linux/fcntl.h>
 
+/* temporary stubs for BKL removal */
+#define lock_flocks() lock_kernel()
+#define unlock_flocks() unlock_kernel()
+
 extern void send_sigio(struct fown_struct *fown, int fd, int band);
 
 #ifdef CONFIG_FILE_LOCKING
-- 
1.7.0

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