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| author | Jeff Mahoney <jeffm@suse.com> | 2013-08-08 17:34:46 -0400 |
|---|---|---|
| committer | Jeff Mahoney <jeffm@suse.de> | 2013-08-08 17:34:46 -0400 |
| commit | 278f6679f454bf185a07d9a4ca355b153482d17a (patch) | |
| tree | ffead073e67cfdc1ddfc3949ebc93c06dcaaab8f /fs/reiserfs/bitmap.c | |
| parent | 4c05141df57f4ffc1a9a28f1925434924179bfe4 (diff) | |
| download | op-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.c | 5 |
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); |
