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authorYan, Zheng <zheng.yan@oracle.com>2009-09-24 09:17:31 -0400
committerChris Mason <chris.mason@oracle.com>2009-09-24 09:17:31 -0400
commita57195214358b75807a74bad96a8601a36262af7 (patch)
treee288410ecfab5f15097bb66f06a5dd6bf99bca08 /fs/btrfs/inode-item.c
parent11ef160fda9c150cd75db77194bcc66839709662 (diff)
Btrfs: check size of inode backref before adding hardlink
For every hardlink in btrfs, there is a corresponding inode back reference. All inode back references for hardlinks in a given directory are stored in single b-tree item. The size of b-tree item is limited by the size of b-tree leaf, so we can only create limited number of hardlinks to a given file in a directory. The original code lacks of the check, it oops if the number of hardlinks goes over the limit. This patch fixes the issue by adding check to btrfs_link and btrfs_rename. Signed-off-by: Yan Zheng <zheng.yan@oracle.com> Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/inode-item.c')
-rw-r--r--fs/btrfs/inode-item.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/btrfs/inode-item.c b/fs/btrfs/inode-item.c
index fc6f4a7f6405..72ce3c173d6a 100644
--- a/fs/btrfs/inode-item.c
+++ b/fs/btrfs/inode-item.c
@@ -149,6 +149,8 @@ int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
ptr = (unsigned long)(ref + 1);
ret = 0;
} else if (ret < 0) {
+ if (ret == -EOVERFLOW)
+ ret = -EMLINK;
goto out;
} else {
ref = btrfs_item_ptr(path->nodes[0], path->slots[0],