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Btrfs: Fix leaf reference cache miss

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Due to the optimization for truncate, tree leaves only containing
checksum items can be deleted without being COW'ed first. This causes
reference cache misses. The way to fix the miss is create cache
entries for tree leaves only contain checksum.

This patch also fixes a -EEXIST issue in shared reference cache.

Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
This commit is contained in:
Yan Zheng
2008-10-09 11:46:19 -04:00
committed by Chris Mason
parent 3bb1a1bc42
commit 5b84e8d6ee
2 changed files with 31 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
fs/btrfs/extent-tree.c
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@@ -1151,6 +1151,14 @@ int btrfs_cache_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
}
ret = btrfs_add_leaf_ref(root, ref, shared);
if (ret == -EEXIST && shared) {
struct btrfs_leaf_ref *old;
old = btrfs_lookup_leaf_ref(root, ref->bytenr);
BUG_ON(!old);
btrfs_remove_leaf_ref(root, old);
btrfs_free_leaf_ref(root, old);
ret = btrfs_add_leaf_ref(root, ref, shared);
}
WARN_ON(ret);
btrfs_free_leaf_ref(root, ref);
}