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> --- diff -urp 1/fs/btrfs/disk-io.c 3/fs/btrfs/disk-io.c --- 1/fs/btrfs/disk-io.c 2009-10-15 09:33:17.811423754 +0800 +++ 3/fs/btrfs/disk-io.c 2009-10-14 14:41:34.000000000 +0800 @@ -982,12 +982,12 @@ int btrfs_free_log_root_tree(struct btrf while (1) { ret = find_first_extent_bit(&log_root_tree->dirty_log_pages, - 0, &start, &end, EXTENT_DIRTY); + 0, &start, &end, EXTENT_DIRTY | EXTENT_NEW); if (ret) break; - clear_extent_dirty(&log_root_tree->dirty_log_pages, - start, end, GFP_NOFS); + clear_extent_bits(&log_root_tree->dirty_log_pages, start, end, + EXTENT_DIRTY | EXTENT_NEW, GFP_NOFS); } eb = fs_info->log_root_tree->node; diff -urp 1/fs/btrfs/extent-tree.c 3/fs/btrfs/extent-tree.c --- 1/fs/btrfs/extent-tree.c 2009-10-21 20:42:19.806223422 +0800 +++ 3/fs/btrfs/extent-tree.c 2009-10-14 13:27:51.000000000 +0800 @@ -4850,8 +4850,16 @@ struct extent_buffer *btrfs_init_new_buf btrfs_set_buffer_uptodate(buf); if (root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) { - set_extent_dirty(&root->dirty_log_pages, buf->start, - buf->start + buf->len - 1, GFP_NOFS); + /* + * we allow two log transactions at a time, use different + * EXENT bit to differentiate dirty pages. + */ + if (root->log_transid % 2 == 0) + set_extent_dirty(&root->dirty_log_pages, buf->start, + buf->start + buf->len - 1, GFP_NOFS); + else + set_extent_new(&root->dirty_log_pages, buf->start, + buf->start + buf->len - 1, GFP_NOFS); } else { set_extent_dirty(&trans->transaction->dirty_pages, buf->start, buf->start + buf->len - 1, GFP_NOFS); diff -urp 1/fs/btrfs/transaction.c 3/fs/btrfs/transaction.c --- 1/fs/btrfs/transaction.c 2009-10-15 09:33:17.893417499 +0800 +++ 3/fs/btrfs/transaction.c 2009-10-14 13:27:51.000000000 +0800 @@ -347,7 +347,7 @@ int btrfs_end_transaction_throttle(struc * 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; @@ -360,7 +360,7 @@ int btrfs_write_marked_extents(struct bt while (1) { ret = find_first_extent_bit(dirty_pages, start, &start, &end, - EXTENT_DIRTY); + mark); if (ret) break; while (start <= end) { @@ -406,7 +406,7 @@ int btrfs_write_marked_extents(struct bt * 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; @@ -418,12 +418,12 @@ int btrfs_wait_marked_extents(struct btr 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; @@ -453,13 +453,13 @@ int btrfs_wait_marked_extents(struct btr * 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; } @@ -472,7 +472,8 @@ int btrfs_write_and_wait_transaction(str 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); } /* diff -urp 1/fs/btrfs/transaction.h 3/fs/btrfs/transaction.h --- 1/fs/btrfs/transaction.h 2009-10-15 09:33:17.894417497 +0800 +++ 3/fs/btrfs/transaction.h 2009-10-14 13:27:51.000000000 +0800 @@ -107,10 +107,10 @@ void btrfs_throttle(struct btrfs_root *r int btrfs_record_root_in_trans(struct btrfs_trans_handle *trans, struct btrfs_root *root); 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 btrfs_write_marked_extents(struct btrfs_root *root, - struct extent_io_tree *dirty_pages); + struct extent_io_tree *dirty_pages, int mark); int btrfs_wait_marked_extents(struct btrfs_root *root, - struct extent_io_tree *dirty_pages); + struct extent_io_tree *dirty_pages, int mark); int btrfs_transaction_in_commit(struct btrfs_fs_info *info); #endif diff -urp 1/fs/btrfs/tree-log.c 3/fs/btrfs/tree-log.c --- 1/fs/btrfs/tree-log.c 2009-10-15 09:33:17.896417074 +0800 +++ 3/fs/btrfs/tree-log.c 2009-10-14 14:42:01.000000000 +0800 @@ -1977,10 +1977,11 @@ int btrfs_sync_log(struct btrfs_trans_ha { int index1; int index2; + int mark; int ret; struct btrfs_root *log = root->log_root; struct btrfs_root *log_root_tree = root->fs_info->log_root_tree; - u64 log_transid = 0; + unsigned long log_transid = 0; mutex_lock(&root->log_mutex); index1 = root->log_transid % 2; @@ -2014,24 +2015,29 @@ int btrfs_sync_log(struct btrfs_trans_ha goto out; } + log_transid = root->log_transid; + if (log_transid % 2 == 0) + mark = EXTENT_DIRTY; + else + mark = EXTENT_NEW; + /* we start IO on all the marked extents here, but we don''t actually * wait for them until later. */ - ret = btrfs_write_marked_extents(log, &log->dirty_log_pages); + ret = btrfs_write_marked_extents(log, &log->dirty_log_pages, mark); BUG_ON(ret); btrfs_set_root_node(&log->root_item, log->node); root->log_batch = 0; - log_transid = root->log_transid; root->log_transid++; log->log_transid = root->log_transid; root->log_start_pid = 0; smp_mb(); /* - * log tree has been flushed to disk, new modifications of - * the log will be written to new positions. so it''s safe to - * allow log writers to go in. + * IO has been started, blocks of the log tree have WRITTEN flag set + * in their headers. new modifications of the log will be written to + * new positions. so it''s safe to allow log writers to go in. */ mutex_unlock(&root->log_mutex); @@ -2052,7 +2058,7 @@ int btrfs_sync_log(struct btrfs_trans_ha index2 = log_root_tree->log_transid % 2; if (atomic_read(&log_root_tree->log_commit[index2])) { - btrfs_wait_marked_extents(log, &log->dirty_log_pages); + btrfs_wait_marked_extents(log, &log->dirty_log_pages, mark); wait_log_commit(trans, log_root_tree, log_root_tree->log_transid); mutex_unlock(&log_root_tree->log_mutex); @@ -2072,16 +2078,17 @@ int btrfs_sync_log(struct btrfs_trans_ha * check the full commit flag again */ if (root->fs_info->last_trans_log_full_commit == trans->transid) { - btrfs_wait_marked_extents(log, &log->dirty_log_pages); + btrfs_wait_marked_extents(log, &log->dirty_log_pages, mark); mutex_unlock(&log_root_tree->log_mutex); ret = -EAGAIN; goto out_wake_log_root; } ret = btrfs_write_and_wait_marked_extents(log_root_tree, - &log_root_tree->dirty_log_pages); + &log_root_tree->dirty_log_pages, + EXTENT_DIRTY | EXTENT_NEW); BUG_ON(ret); - btrfs_wait_marked_extents(log, &log->dirty_log_pages); + btrfs_wait_marked_extents(log, &log->dirty_log_pages, mark); btrfs_set_super_log_root(&root->fs_info->super_for_commit, log_root_tree->node->start); @@ -2147,12 +2154,12 @@ int btrfs_free_log(struct btrfs_trans_ha while (1) { ret = find_first_extent_bit(&log->dirty_log_pages, - 0, &start, &end, EXTENT_DIRTY); + 0, &start, &end, EXTENT_DIRTY | EXTENT_NEW); if (ret) break; - clear_extent_dirty(&log->dirty_log_pages, - start, end, GFP_NOFS); + clear_extent_bits(&log->dirty_log_pages, start, end, + EXTENT_DIRTY | EXTENT_NEW, GFP_NOFS); } if (log->log_transid > 0) { -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html