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Commit 12ddb96c authored by Josef Bacik's avatar Josef Bacik
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Btrfs: map the inode item when doing fill_inode_item 



Instead of calling kmap_atomic for every thing we set in the inode item, map the
entire inode item at the start and unmap it at the end.  This makes a sequential
dd of 400mb O_DIRECT something like 1% faster.  Thanks,

Signed-off-by: default avatarJosef Bacik <josef@redhat.com>
parent 06d5a589

fs/btrfs/inode.c

+12 −0
Original line number Diff line number Diff line
@@ -2589,6 +2589,13 @@ static void fill_inode_item(struct btrfs_trans_handle *trans, 
			    struct btrfs_inode_item *item,

			    struct inode *inode)

{

	if (!leaf->map_token)

		map_private_extent_buffer(leaf, (unsigned long)item,

					  sizeof(struct btrfs_inode_item),

					  &leaf->map_token, &leaf->kaddr,

					  &leaf->map_start, &leaf->map_len,

					  KM_USER1);



	btrfs_set_inode_uid(leaf, item, inode->i_uid);

	btrfs_set_inode_gid(leaf, item, inode->i_gid);

	btrfs_set_inode_size(leaf, item, BTRFS_I(inode)->disk_i_size);
@@ -2617,6 +2624,11 @@ static void fill_inode_item(struct btrfs_trans_handle *trans, 
	btrfs_set_inode_rdev(leaf, item, inode->i_rdev);

	btrfs_set_inode_flags(leaf, item, BTRFS_I(inode)->flags);

	btrfs_set_inode_block_group(leaf, item, BTRFS_I(inode)->block_group);



	if (leaf->map_token) {

		unmap_extent_buffer(leaf, leaf->map_token, KM_USER1);

		leaf->map_token = NULL;

	}

}



/*