From 41e7acd38c1ae82f24f51d302bbdecdb4675b6b2 Mon Sep 17 00:00:00 2001 From: Nikolay Borisov Date: Mon, 25 Mar 2019 14:31:24 +0200 Subject: [PATCH] btrfs: Rename and export clear_btree_io_tree This function is going to be used to clear out the device extent allocation information. Give it a more generic name and export it. This is in preparation to replacing the pending/pinned chunk lists with an extent tree. No functional changes. Signed-off-by: Nikolay Borisov Reviewed-by: David Sterba Signed-off-by: David Sterba --- fs/btrfs/extent_io.c | 29 +++++++++++++++++++++++++++++ fs/btrfs/extent_io.h | 1 + fs/btrfs/transaction.c | 37 ++++--------------------------------- 3 files changed, 34 insertions(+), 33 deletions(-) diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index a3e3e95c632e..26d7b6a5d567 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -266,6 +266,35 @@ void extent_io_tree_init(struct btrfs_fs_info *fs_info, tree->owner = owner; } +void extent_io_tree_release(struct extent_io_tree *tree) +{ + spin_lock(&tree->lock); + /* + * Do a single barrier for the waitqueue_active check here, the state + * of the waitqueue should not change once extent_io_tree_release is + * called. + */ + smp_mb(); + while (!RB_EMPTY_ROOT(&tree->state)) { + struct rb_node *node; + struct extent_state *state; + + node = rb_first(&tree->state); + state = rb_entry(node, struct extent_state, rb_node); + rb_erase(&state->rb_node, &tree->state); + RB_CLEAR_NODE(&state->rb_node); + /* + * btree io trees aren't supposed to have tasks waiting for + * changes in the flags of extent states ever. + */ + ASSERT(!waitqueue_active(&state->wq)); + free_extent_state(state); + + cond_resched_lock(&tree->lock); + } + spin_unlock(&tree->lock); +} + static struct extent_state *alloc_extent_state(gfp_t mask) { struct extent_state *state; diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h index c4ec104ac157..722dc7d1b674 100644 --- a/fs/btrfs/extent_io.h +++ b/fs/btrfs/extent_io.h @@ -255,6 +255,7 @@ typedef struct extent_map *(get_extent_t)(struct btrfs_inode *inode, void extent_io_tree_init(struct btrfs_fs_info *fs_info, struct extent_io_tree *tree, unsigned int owner, void *private_data); +void extent_io_tree_release(struct extent_io_tree *tree); int try_release_extent_mapping(struct page *page, gfp_t mask); int try_release_extent_buffer(struct page *page); int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c index 4aa827a2e951..b32769998bbb 100644 --- a/fs/btrfs/transaction.c +++ b/fs/btrfs/transaction.c @@ -80,35 +80,6 @@ void btrfs_put_transaction(struct btrfs_transaction *transaction) } } -static void clear_btree_io_tree(struct extent_io_tree *tree) -{ - spin_lock(&tree->lock); - /* - * Do a single barrier for the waitqueue_active check here, the state - * of the waitqueue should not change once clear_btree_io_tree is - * called. - */ - smp_mb(); - while (!RB_EMPTY_ROOT(&tree->state)) { - struct rb_node *node; - struct extent_state *state; - - node = rb_first(&tree->state); - state = rb_entry(node, struct extent_state, rb_node); - rb_erase(&state->rb_node, &tree->state); - RB_CLEAR_NODE(&state->rb_node); - /* - * btree io trees aren't supposed to have tasks waiting for - * changes in the flags of extent states ever. - */ - ASSERT(!waitqueue_active(&state->wq)); - free_extent_state(state); - - cond_resched_lock(&tree->lock); - } - spin_unlock(&tree->lock); -} - static noinline void switch_commit_roots(struct btrfs_transaction *trans) { struct btrfs_fs_info *fs_info = trans->fs_info; @@ -122,7 +93,7 @@ static noinline void switch_commit_roots(struct btrfs_transaction *trans) root->commit_root = btrfs_root_node(root); if (is_fstree(root->root_key.objectid)) btrfs_unpin_free_ino(root); - clear_btree_io_tree(&root->dirty_log_pages); + extent_io_tree_release(&root->dirty_log_pages); btrfs_qgroup_clean_swapped_blocks(root); } @@ -930,7 +901,7 @@ int btrfs_write_marked_extents(struct btrfs_fs_info *fs_info, * superblock that points to btree nodes/leafs for which * writeback hasn't finished yet (and without errors). * We cleanup any entries left in the io tree when committing - * the transaction (through clear_btree_io_tree()). + * the transaction (through extent_io_tree_release()). */ if (err == -ENOMEM) { err = 0; @@ -975,7 +946,7 @@ static int __btrfs_wait_marked_extents(struct btrfs_fs_info *fs_info, * left in the io tree. For a log commit, we don't remove them * after committing the log because the tree can be accessed * concurrently - we do it only at transaction commit time when - * it's safe to do it (through clear_btree_io_tree()). + * it's safe to do it (through extent_io_tree_release()). */ err = clear_extent_bit(dirty_pages, start, end, EXTENT_NEED_WAIT, 0, 0, &cached_state); @@ -1053,7 +1024,7 @@ static int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans) blk_finish_plug(&plug); ret2 = btrfs_wait_extents(fs_info, dirty_pages); - clear_btree_io_tree(&trans->transaction->dirty_pages); + extent_io_tree_release(&trans->transaction->dirty_pages); if (ret) return ret; -- 2.30.2