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| author | Arnd Bergmann <arnd@arndb.de> | 2010-09-18 15:09:31 +0200 |
|---|---|---|
| committer | Arnd Bergmann <arnd@arndb.de> | 2010-10-05 11:02:04 +0200 |
| commit | b89f432133851a01c0d28822f11cbdcc15781a75 (patch) | |
| tree | a3e9ba638a9b746985148f4525335d360ec7da56 /fs/gfs2/file.c | |
| parent | BKL: Remove BKL from ncpfs (diff) | |
| download | linux-b89f432133851a01c0d28822f11cbdcc15781a75.tar.xz linux-b89f432133851a01c0d28822f11cbdcc15781a75.zip | |
fs/locks.c: prepare for BKL removal
This prepares the removal of the big kernel lock from the
file locking code. We still use the BKL as long as fs/lockd
uses it and ceph might sleep, but we can flip the definition
to a private spinlock as soon as that's done.
All users outside of fs/lockd get converted to use
lock_flocks() instead of lock_kernel() where appropriate.
Based on an earlier patch to use a spinlock from Matthew
Wilcox, who has attempted this a few times before, the
earliest patch from over 10 years ago turned it into
a semaphore, which ended up being slower than the BKL
and was subsequently reverted.
Someone should do some serious performance testing when
this becomes a spinlock, since this has caused problems
before. Using a spinlock should be at least as good
as the BKL in theory, but who knows...
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Matthew Wilcox <willy@linux.intel.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Trond Myklebust <trond.myklebust@fys.uio.no>
Cc: "J. Bruce Fields" <bfields@fieldses.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Miklos Szeredi <mszeredi@suse.cz>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: John Kacur <jkacur@redhat.com>
Cc: Sage Weil <sage@newdream.net>
Cc: linux-kernel@vger.kernel.org
Cc: linux-fsdevel@vger.kernel.org
Diffstat (limited to 'fs/gfs2/file.c')
| -rw-r--r-- | fs/gfs2/file.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c index 4edd662c8232..8fcfefb96077 100644 --- a/fs/gfs2/file.c +++ b/fs/gfs2/file.c @@ -620,6 +620,8 @@ static ssize_t gfs2_file_aio_write(struct kiocb *iocb, const struct iovec *iov, * cluster; until we do, disable leases (by just returning -EINVAL), * unless the administrator has requested purely local locking. * + * Locking: called under lock_flocks + * * Returns: errno */ |