btrfs: qgroup: do a reservation in a higher level.

There are two problems in qgroup:

a). The PAGE_CACHE is 4K, even when we are writing a data of 1K,
qgroup will reserve a 4K size. It will cause the last 3K in a qgroup
is not available to user.

b). When user is writing a inline data, qgroup will not reserve it,
it means this is a window we can exceed the limit of a qgroup.

The main idea of this patch is reserving the data size of write_bytes
rather than the reserve_bytes. It means qgroup will not care about
the data size btrfs will reserve for user, but only care about the
data size user is going to write. Then reserve it when user want to
write and release it in transaction committed.

In this way, qgroup can be released from the complex procedure in
btrfs and only do the reserve when user want to write and account
when the data is written in commit_transaction().

Signed-off-by: Dongsheng Yang <yangds.fnst@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>

1 files changed, 0 insertions, 15 deletions

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index a9f69a0..27b59b83 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -754,9 +754,6 @@ retry:
 			}
 			goto out_free;
 		}
-		btrfs_qgroup_update_reserved_bytes(root->fs_info,
-						   root->root_key.objectid,
-						   ins.offset, 1);
 		/*
 		 * here we're doing allocation and writeback of the
 		 * compressed pages
@@ -981,10 +978,6 @@ static noinline int cow_file_range(struct inode *inode,
 		if (ret < 0)
 			goto out_unlock;
 
-		btrfs_qgroup_update_reserved_bytes(root->fs_info,
-						   root->root_key.objectid,
-						   ins.offset, 1);
-
 		em = alloc_extent_map();
 		if (!em) {
 			ret = -ENOMEM;
@@ -7037,10 +7030,6 @@ static struct extent_map *btrfs_new_extent_direct(struct inode *inode,
 		return ERR_PTR(ret);
 	}
 
-	btrfs_qgroup_update_reserved_bytes(root->fs_info,
-					   root->root_key.objectid,
-					   ins.offset, 1);
-
 	return em;
 }
 
@@ -9595,10 +9584,6 @@ static int __btrfs_prealloc_file_range(struct inode *inode, int mode,
 			break;
 		}
 
-		btrfs_qgroup_update_reserved_bytes(root->fs_info,
-						   root->root_key.objectid,
-						   ins.offset, 1);
-
 		btrfs_drop_extent_cache(inode, cur_offset,
 					cur_offset + ins.offset -1, 0);