lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

Btrfs: Add a leaf reference cache

Browse Source 
Much of the IO done while dropping snapshots is done looking up
leaves in the filesystem trees to see if they point to any extents and
to drop the references on any extents found.

This creates a cache so that IO isn't required.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Yan Zheng
2008-07-28 15:32:19 -04:00
committed by Chris Mason
parent 3a115f520f
commit 31153d8128
8 changed files with 476 additions and 33 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
fs/btrfs/ctree.c
View File

@@ -165,7 +165,7 @@ int btrfs_copy_root(struct btrfs_trans_handle *trans,
btrfs_clear_header_flag(cow, BTRFS_HEADER_FLAG_WRITTEN);
WARN_ON(btrfs_header_generation(buf) > trans->transid);
ret = btrfs_inc_ref(trans, new_root, buf);
ret = btrfs_inc_ref(trans, new_root, buf, 0);
kfree(new_root);
if (ret)
@@ -232,7 +232,7 @@ int __btrfs_cow_block(struct btrfs_trans_handle *trans,
WARN_ON(btrfs_header_generation(buf) > trans->transid);
if (btrfs_header_generation(buf) != trans->transid) {
different_trans = 1;
ret = btrfs_inc_ref(trans, root, buf);
ret = btrfs_inc_ref(trans, root, buf, 1);
if (ret)
return ret;
} else {