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authorFrederic Weisbecker <fweisbec@gmail.com>2009-05-08 01:48:44 +0400
committerFrederic Weisbecker <fweisbec@gmail.com>2009-09-14 09:18:16 +0400
commit26931309a47747fd31b2ef029c29d47794c2d93d (patch)
tree85b3ba9ee14c6d90243e4590af60e7ef3e72c5ff /fs/reiserfs/inode.c
parentd663af807d8bb226394cb7e02f4665f6141a8140 (diff)
downloadlinux-26931309a47747fd31b2ef029c29d47794c2d93d.tar.xz
kill-the-bkl/reiserfs: lock only once on reiserfs_get_block()
reiserfs_get_block() is one of these sites where the write lock might be acquired recursively. It's a particular problem because this function is called very often. It's a hot spot which needs to reschedule() periodically while converting direct items to indirect ones because it can take some time. Then if we are applying the write lock release/reacquire pattern on schedule() here, it may not produce the desired effect since we may have locked in more than one depth. The solution is to use reiserfs_write_lock_once() which won't try to reacquire the lock recursively. Then the lock will be *really* released before schedule(). Also, we only release the lock if TIF_NEED_RESCHED is set to not create wasteful numerous contentions. [ Impact: fix a too long holded lock case in reiserfs_get_block() ] Cc: Jeff Mahoney <jeffm@suse.com> Cc: Chris Mason <chris.mason@oracle.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Alexander Beregalov <a.beregalov@gmail.com> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Diffstat (limited to 'fs/reiserfs/inode.c')
-rw-r--r--fs/reiserfs/inode.c19
1 files changed, 11 insertions, 8 deletions
diff --git a/fs/reiserfs/inode.c b/fs/reiserfs/inode.c
index cc70b56bf6f2..6114050f342e 100644
--- a/fs/reiserfs/inode.c
+++ b/fs/reiserfs/inode.c
@@ -605,6 +605,7 @@ int reiserfs_get_block(struct inode *inode, sector_t block,
__le32 *item;
int done;
int fs_gen;
+ int lock_depth;
struct reiserfs_transaction_handle *th = NULL;
/* space reserved in transaction batch:
. 3 balancings in direct->indirect conversion
@@ -620,11 +621,11 @@ int reiserfs_get_block(struct inode *inode, sector_t block,
loff_t new_offset =
(((loff_t) block) << inode->i_sb->s_blocksize_bits) + 1;
- reiserfs_write_lock(inode->i_sb);
+ lock_depth = reiserfs_write_lock_once(inode->i_sb);
version = get_inode_item_key_version(inode);
if (!file_capable(inode, block)) {
- reiserfs_write_unlock(inode->i_sb);
+ reiserfs_write_unlock_once(inode->i_sb, lock_depth);
return -EFBIG;
}
@@ -636,7 +637,7 @@ int reiserfs_get_block(struct inode *inode, sector_t block,
/* find number of block-th logical block of the file */
ret = _get_block_create_0(inode, block, bh_result,
create | GET_BLOCK_READ_DIRECT);
- reiserfs_write_unlock(inode->i_sb);
+ reiserfs_write_unlock_once(inode->i_sb, lock_depth);
return ret;
}
/*
@@ -754,7 +755,7 @@ int reiserfs_get_block(struct inode *inode, sector_t block,
if (!dangle && th)
retval = reiserfs_end_persistent_transaction(th);
- reiserfs_write_unlock(inode->i_sb);
+ reiserfs_write_unlock_once(inode->i_sb, lock_depth);
/* the item was found, so new blocks were not added to the file
** there is no need to make sure the inode is updated with this
@@ -1005,9 +1006,11 @@ int reiserfs_get_block(struct inode *inode, sector_t block,
* long time. reschedule if needed and also release the write
* lock for others.
*/
- reiserfs_write_unlock(inode->i_sb);
- cond_resched();
- reiserfs_write_lock(inode->i_sb);
+ if (need_resched()) {
+ reiserfs_write_unlock_once(inode->i_sb, lock_depth);
+ schedule();
+ lock_depth = reiserfs_write_lock_once(inode->i_sb);
+ }
retval = search_for_position_by_key(inode->i_sb, &key, &path);
if (retval == IO_ERROR) {
@@ -1042,7 +1045,7 @@ int reiserfs_get_block(struct inode *inode, sector_t block,
retval = err;
}
- reiserfs_write_unlock(inode->i_sb);
+ reiserfs_write_unlock_once(inode->i_sb, lock_depth);
reiserfs_check_path(&path);
return retval;
}