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| author | Yan, Zheng <zheng.yan@oracle.com> | 2009-09-24 09:17:31 -0400 |
|---|---|---|
| committer | Chris Mason <chris.mason@oracle.com> | 2009-09-24 09:17:31 -0400 |
| commit | a57195214358b75807a74bad96a8601a36262af7 (patch) | |
| tree | e288410ecfab5f15097bb66f06a5dd6bf99bca08 /fs/btrfs/inode-item.c | |
| parent | 11ef160fda9c150cd75db77194bcc66839709662 (diff) | |
| download | blackbird-op-linux-a57195214358b75807a74bad96a8601a36262af7.tar.gz blackbird-op-linux-a57195214358b75807a74bad96a8601a36262af7.zip | |
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.c | 2 |
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], |
