Commit 2c463823 authored by Filipe Manana's avatar Filipe Manana Committed by Chris Mason
Browse files

Btrfs: avoid visiting all extent items when cloning a range 



When cloning a range of a file, we were visiting all the extent items in
the btree that belong to our source inode. We don't need to visit those
extent items that don't overlap the range we are cloning, as doing so only
makes us waste time and do unnecessary btree navigations (btrfs_next_leaf)
for inodes that have a large number of file extent items in the btree.

Signed-off-by: default avatarFilipe David Borba Manana <fdmanana@gmail.com>
Signed-off-by: default avatarChris Mason <clm@fb.com>
parent c55bfa67

fs/btrfs/ioctl.c

+22 −4
Original line number Diff line number Diff line
@@ -3020,7 +3020,7 @@ static int btrfs_clone(struct inode *src, struct inode *inode, 
	/* clone data */

	key.objectid = btrfs_ino(src);

	key.type = BTRFS_EXTENT_DATA_KEY;

	key.offset = 0;

	key.offset = off;



	while (1) {

		/*
@@ -3032,6 +3032,17 @@ static int btrfs_clone(struct inode *src, struct inode *inode, 
				0, 0);

		if (ret < 0)

			goto out;

		/*

		 * First search, if no extent item that starts at offset off was

		 * found but the previous item is an extent item, it's possible

		 * it might overlap our target range, therefore process it.

		 */

		if (key.offset == off && ret > 0 && path->slots[0] > 0) {

			btrfs_item_key_to_cpu(path->nodes[0], &key,

					      path->slots[0] - 1);

			if (key.type == BTRFS_EXTENT_DATA_KEY)

				path->slots[0]--;

		}



		nritems = btrfs_header_nritems(path->nodes[0]);

process_slot:
@@ -3081,10 +3092,16 @@ process_slot: 
								    extent);

			}



			if (key.offset + datal <= off ||

			    key.offset >= off + len - 1) {

			/*

			 * The first search might have left us at an extent

			 * item that ends before our target range's start, can

			 * happen if we have holes and NO_HOLES feature enabled.

			 */

			if (key.offset + datal <= off) {

				path->slots[0]++;

				goto process_slot;

			} else if (key.offset >= off + len) {

				break;

			}



			size = btrfs_item_size_nr(leaf, slot);
@@ -3291,6 +3308,8 @@ process_slot: 
				goto out;

			}

			ret = btrfs_end_transaction(trans, root);

			if (new_key.offset + datal >= destoff + len)

				break;

		}

		btrfs_release_path(path);

		key.offset++;
@@ -3298,7 +3317,6 @@ process_slot: 
	ret = 0;



out:

	btrfs_release_path(path);

	btrfs_free_path(path);

	vfree(buf);

	return ret;

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