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authorJeff Mahoney <jeffm@suse.com>2013-08-08 17:34:46 -0400
committerJeff Mahoney <jeffm@suse.de>2013-08-08 17:34:46 -0400
commit278f6679f454bf185a07d9a4ca355b153482d17a (patch)
treeffead073e67cfdc1ddfc3949ebc93c06dcaaab8f /fs/reiserfs/bitmap.c
parent4c05141df57f4ffc1a9a28f1925434924179bfe4 (diff)
downloadop-kernel-dev-278f6679f454bf185a07d9a4ca355b153482d17a.zip
op-kernel-dev-278f6679f454bf185a07d9a4ca355b153482d17a.tar.gz
reiserfs: locking, handle nested locks properly
The reiserfs write lock replaced the BKL and uses similar semantics. Frederic's locking code makes a distinction between when the lock is nested and when it's being acquired/released, but I don't think that's the right distinction to make. The right distinction is between the lock being released at end-of-use and the lock being released for a schedule. The unlock should return the depth and the lock should restore it, rather than the other way around as it is now. This patch implements that and adds a number of places where the lock should be dropped. Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Diffstat (limited to 'fs/reiserfs/bitmap.c')
-rw-r--r--fs/reiserfs/bitmap.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/fs/reiserfs/bitmap.c b/fs/reiserfs/bitmap.c
index a98b774..881f8ea 100644
--- a/fs/reiserfs/bitmap.c
+++ b/fs/reiserfs/bitmap.c
@@ -1340,10 +1340,11 @@ struct buffer_head *reiserfs_read_bitmap_block(struct super_block *sb,
"reading failed", __func__, block);
else {
if (buffer_locked(bh)) {
+ int depth;
PROC_INFO_INC(sb, scan_bitmap.wait);
- reiserfs_write_unlock(sb);
+ depth = reiserfs_write_unlock_nested(sb);
__wait_on_buffer(bh);
- reiserfs_write_lock(sb);
+ reiserfs_write_lock_nested(sb, depth);
}
BUG_ON(!buffer_uptodate(bh));
BUG_ON(atomic_read(&bh->b_count) == 0);
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