btrfs: move extent locking outside of btrfs_truncate_inode_items

Currently we are locking the extent and dropping the extent cache for
any inodes we truncate, unless they're in the tree log.  We call this
helper from:

- truncate
- evict
- tree log
- free space cache truncation

For evict we've already dropped all of the extent cache for this inode
once we've gotten here, and we're the only one accessing this inode, so
this step is unnecessary.

For the tree log code we already skip this part.

Pull this work into the truncate path and the free space cache
truncation path.

Reviewed-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

1 files changed, 0 insertions, 18 deletions

diff --git a/fs/btrfs/inode-item.c b/fs/btrfs/inode-item.c
index c43a3610f443..604ace69574b 100644
--- a/fs/btrfs/inode-item.c
+++ b/fs/btrfs/inode-item.c
@@ -473,8 +473,6 @@ int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
 	u64 bytes_deleted = 0;
 	bool be_nice = false;
 	bool should_throttle = false;
-	const u64 lock_start = ALIGN_DOWN(new_size, fs_info->sectorsize);
-	struct extent_state *cached_state = NULL;
 
 	BUG_ON(new_size > 0 && min_type != BTRFS_EXTENT_DATA_KEY);
 
@@ -492,20 +490,6 @@ int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
 		return -ENOMEM;
 	path->reada = READA_BACK;
 
-	if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) {
-		lock_extent_bits(&inode->io_tree, lock_start, (u64)-1,
-				 &cached_state);
-
-		/*
-		 * We want to drop from the next block forward in case this
-		 * new size is not block aligned since we will be keeping the
-		 * last block of the extent just the way it is.
-		 */
-		btrfs_drop_extent_cache(inode, ALIGN(new_size,
-					fs_info->sectorsize),
-					(u64)-1, 0);
-	}
-
 	/*
 	 * This function is also used to drop the items in the log tree before
 	 * we relog the inode, so if root != BTRFS_I(inode)->root, it means
@@ -783,8 +767,6 @@ out:
 		if (!ret && last_size > new_size)
 			last_size = new_size;
 		btrfs_inode_safe_disk_i_size_write(inode, last_size);
-		unlock_extent_cached(&inode->io_tree, lock_start, (u64)-1,
-				     &cached_state);
 	}
 
 	btrfs_free_path(path);