Btrfs: Avoid superfluous tree-log writeout
We allow two log transactions at a time, but use same flag
to mark dirty tree-log btree blocks. So we may flush dirty
blocks belonging to newer log transaction when committing a
log transaction. This patch fixes the issue by using two
flags to mark dirty tree-log btree blocks.
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index c207e8c..b7b22c3 100644
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -354,7 +354,7 @@
* those extents are sent to disk but does not wait on them
*/
int btrfs_write_marked_extents(struct btrfs_root *root,
- struct extent_io_tree *dirty_pages)
+ struct extent_io_tree *dirty_pages, int mark)
{
int ret;
int err = 0;
@@ -367,7 +367,7 @@
while (1) {
ret = find_first_extent_bit(dirty_pages, start, &start, &end,
- EXTENT_DIRTY);
+ mark);
if (ret)
break;
while (start <= end) {
@@ -413,7 +413,7 @@
* on all the pages and clear them from the dirty pages state tree
*/
int btrfs_wait_marked_extents(struct btrfs_root *root,
- struct extent_io_tree *dirty_pages)
+ struct extent_io_tree *dirty_pages, int mark)
{
int ret;
int err = 0;
@@ -425,12 +425,12 @@
unsigned long index;
while (1) {
- ret = find_first_extent_bit(dirty_pages, 0, &start, &end,
- EXTENT_DIRTY);
+ ret = find_first_extent_bit(dirty_pages, start, &start, &end,
+ mark);
if (ret)
break;
- clear_extent_dirty(dirty_pages, start, end, GFP_NOFS);
+ clear_extent_bits(dirty_pages, start, end, mark, GFP_NOFS);
while (start <= end) {
index = start >> PAGE_CACHE_SHIFT;
start = (u64)(index + 1) << PAGE_CACHE_SHIFT;
@@ -460,13 +460,13 @@
* those extents are on disk for transaction or log commit
*/
int btrfs_write_and_wait_marked_extents(struct btrfs_root *root,
- struct extent_io_tree *dirty_pages)
+ struct extent_io_tree *dirty_pages, int mark)
{
int ret;
int ret2;
- ret = btrfs_write_marked_extents(root, dirty_pages);
- ret2 = btrfs_wait_marked_extents(root, dirty_pages);
+ ret = btrfs_write_marked_extents(root, dirty_pages, mark);
+ ret2 = btrfs_wait_marked_extents(root, dirty_pages, mark);
return ret || ret2;
}
@@ -479,7 +479,8 @@
return filemap_write_and_wait(btree_inode->i_mapping);
}
return btrfs_write_and_wait_marked_extents(root,
- &trans->transaction->dirty_pages);
+ &trans->transaction->dirty_pages,
+ EXTENT_DIRTY);
}
/*
