From ace68bac61b338e52924d87ebdd0fa8c7439f896 Mon Sep 17 00:00:00 2001
From: Liu Bo <bo.li.liu@oracle.com>
Date: Mon, 22 Apr 2013 10:53:47 +0000
Subject: [PATCH] Btrfs: return free space in cow error path
Replace some BUG_ONs with proper handling and take allocated space back to
free space cache for later use.
We don't have to worry about extent maps since they'd be freed in releasepage
path.
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
---
fs/btrfs/inode.c | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 33a9e9da726d5..0eab7b67e109f 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -920,7 +920,8 @@ static noinline int __cow_file_range(struct btrfs_trans_handle *trans,
}
em = alloc_extent_map();
- BUG_ON(!em); /* -ENOMEM */
+ if (!em)
+ goto out_reserve;
em->start = start;
em->orig_start = em->start;
ram_size = ins.offset;
@@ -947,11 +948,14 @@ static noinline int __cow_file_range(struct btrfs_trans_handle *trans,
btrfs_drop_extent_cache(inode, start,
start + ram_size - 1, 0);
}
+ if (ret)
+ goto out_reserve;
cur_alloc_size = ins.offset;
ret = btrfs_add_ordered_extent(inode, start, ins.objectid,
ram_size, cur_alloc_size, 0);
- BUG_ON(ret); /* -ENOMEM */
+ if (ret)
+ goto out_reserve;
if (root->root_key.objectid ==
BTRFS_DATA_RELOC_TREE_OBJECTID) {
@@ -959,7 +963,7 @@ static noinline int __cow_file_range(struct btrfs_trans_handle *trans,
cur_alloc_size);
if (ret) {
btrfs_abort_transaction(trans, root, ret);
- goto out_unlock;
+ goto out_reserve;
}
}
@@ -988,6 +992,8 @@ static noinline int __cow_file_range(struct btrfs_trans_handle *trans,
out:
return ret;
+out_reserve:
+ btrfs_free_reserved_extent(root, ins.objectid, ins.offset);
out_unlock:
extent_clear_unlock_delalloc(inode,
&BTRFS_I(inode)->io_tree,