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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>
wifi-calibration
Liu Bo 2013-04-22 10:53:47 +00:00 committed by Josef Bacik
parent 6463fe58ea
commit ace68bac61
1 changed files with 9 additions and 3 deletions
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12
fs/btrfs/inode.c
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@ -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,