With the old code, we must map the page every time we want to set a member variable of the inode item, it is inefficient. We just do it at first. By this way, we can improve the performance of file creation and deletion by ~2%
Signed-off-by: Miao Xie <[email protected]> --- fs/btrfs/inode.c | 15 +++++++++++++++ 1 files changed, 15 insertions(+), 0 deletions(-) diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 46b9d1a..2f0c742 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -2539,6 +2539,16 @@ static void fill_inode_item(struct btrfs_trans_handle *trans, struct btrfs_inode_item *item, struct inode *inode) { + int unmap_on_exit; + + unmap_on_exit = (leaf->map_token == NULL); + if (unmap_on_exit) + map_extent_buffer(leaf, (unsigned long)item, + sizeof(*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); @@ -2567,6 +2577,11 @@ 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 (unmap_on_exit && leaf->map_token) { + unmap_extent_buffer(leaf, leaf->map_token, KM_USER1); + leaf->map_token = NULL; + } } /* -- 1.7.0.1 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
