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authorFrederic Weisbecker <fweisbec@gmail.com>2009-04-14 07:34:23 +0400
committerFrederic Weisbecker <fweisbec@gmail.com>2009-09-14 09:18:02 +0400
commitdaf88c898312a22b5385655bc6e0b064eaa2efba (patch)
tree016c432fc26c174d5aee3647e54f2aafb690dceb /include/linux/reiserfs_fs.h
parenta412f9efdd6424bf4bf28c8e8c92060b5e975482 (diff)
downloadlinux-daf88c898312a22b5385655bc6e0b064eaa2efba.tar.xz
kill-the-BKL/reiserfs: provide a tool to lock only once the write lock
Sometimes we don't want to recursively hold the per superblock write lock because we want to be sure it is actually released when we come to sleep. This patch introduces the necessary tools for that. reiserfs_write_lock_once() does the same job than reiserfs_write_lock() except that it won't try to acquire recursively the lock if the current task already owns it. Also the lock_depth before the call of this function is returned. reiserfs_write_unlock_once() unlock only if reiserfs_write_lock_once() returned a depth equal to -1, ie: only if it actually locked. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Alessio Igor Bogani <abogani@texware.it> Cc: Jeff Mahoney <jeffm@suse.com> Cc: Alexander Beregalov <a.beregalov@gmail.com> Cc: Chris Mason <chris.mason@oracle.com> LKML-Reference: <1239680065-25013-2-git-send-email-fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/linux/reiserfs_fs.h')
-rw-r--r--include/linux/reiserfs_fs.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/reiserfs_fs.h b/include/linux/reiserfs_fs.h
index e47328f51801..4a2df57c8b1d 100644
--- a/include/linux/reiserfs_fs.h
+++ b/include/linux/reiserfs_fs.h
@@ -59,6 +59,8 @@
*/
void reiserfs_write_lock(struct super_block *s);
void reiserfs_write_unlock(struct super_block *s);
+int reiserfs_write_lock_once(struct super_block *s);
+void reiserfs_write_unlock_once(struct super_block *s, int lock_depth);
struct fid;