nfsd4: fix share mode permissions

[safe/jmp/linux-2.6] / fs / btrfs / inode-item.c

diff --git a/fs/btrfs/inode-item.c b/fs/btrfs/inode-item.c
index 35d2608..72ce3c1 100644 (file)
--- a/fs/btrfs/inode-item.c
+++ b/fs/btrfs/inode-item.c
@@ -20,6 +20,153 @@
 #include "disk-io.h"
 #include "transaction.h"
 
+static int find_name_in_backref(struct btrfs_path *path, const char *name,
+                        int name_len, struct btrfs_inode_ref **ref_ret)
+{
+       struct extent_buffer *leaf;
+       struct btrfs_inode_ref *ref;
+       unsigned long ptr;
+       unsigned long name_ptr;
+       u32 item_size;
+       u32 cur_offset = 0;
+       int len;
+
+       leaf = path->nodes[0];
+       item_size = btrfs_item_size_nr(leaf, path->slots[0]);
+       ptr = btrfs_item_ptr_offset(leaf, path->slots[0]);
+       while (cur_offset < item_size) {
+               ref = (struct btrfs_inode_ref *)(ptr + cur_offset);
+               len = btrfs_inode_ref_name_len(leaf, ref);
+               name_ptr = (unsigned long)(ref + 1);
+               cur_offset += len + sizeof(*ref);
+               if (len != name_len)
+                       continue;
+               if (memcmp_extent_buffer(leaf, name, name_ptr, name_len) == 0) {
+                       *ref_ret = ref;
+                       return 1;
+               }
+       }
+       return 0;
+}
+
+int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
+                          struct btrfs_root *root,
+                          const char *name, int name_len,
+                          u64 inode_objectid, u64 ref_objectid, u64 *index)
+{
+       struct btrfs_path *path;
+       struct btrfs_key key;
+       struct btrfs_inode_ref *ref;
+       struct extent_buffer *leaf;
+       unsigned long ptr;
+       unsigned long item_start;
+       u32 item_size;
+       u32 sub_item_len;
+       int ret;
+       int del_len = name_len + sizeof(*ref);
+
+       key.objectid = inode_objectid;
+       key.offset = ref_objectid;
+       btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY);
+
+       path = btrfs_alloc_path();
+       if (!path)
+               return -ENOMEM;
+
+       path->leave_spinning = 1;
+
+       ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
+       if (ret > 0) {
+               ret = -ENOENT;
+               goto out;
+       } else if (ret < 0) {
+               goto out;
+       }
+       if (!find_name_in_backref(path, name, name_len, &ref)) {
+               ret = -ENOENT;
+               goto out;
+       }
+       leaf = path->nodes[0];
+       item_size = btrfs_item_size_nr(leaf, path->slots[0]);
+
+       if (index)
+               *index = btrfs_inode_ref_index(leaf, ref);
+
+       if (del_len == item_size) {
+               ret = btrfs_del_item(trans, root, path);
+               goto out;
+       }
+       ptr = (unsigned long)ref;
+       sub_item_len = name_len + sizeof(*ref);
+       item_start = btrfs_item_ptr_offset(leaf, path->slots[0]);
+       memmove_extent_buffer(leaf, ptr, ptr + sub_item_len,
+                             item_size - (ptr + sub_item_len - item_start));
+       ret = btrfs_truncate_item(trans, root, path,
+                                 item_size - sub_item_len, 1);
+       BUG_ON(ret);
+out:
+       btrfs_free_path(path);
+       return ret;
+}
+
+int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
+                          struct btrfs_root *root,
+                          const char *name, int name_len,
+                          u64 inode_objectid, u64 ref_objectid, u64 index)
+{
+       struct btrfs_path *path;
+       struct btrfs_key key;
+       struct btrfs_inode_ref *ref;
+       unsigned long ptr;
+       int ret;
+       int ins_len = name_len + sizeof(*ref);
+
+       key.objectid = inode_objectid;
+       key.offset = ref_objectid;
+       btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY);
+
+       path = btrfs_alloc_path();
+       if (!path)
+               return -ENOMEM;
+
+       path->leave_spinning = 1;
+       ret = btrfs_insert_empty_item(trans, root, path, &key,
+                                     ins_len);
+       if (ret == -EEXIST) {
+               u32 old_size;
+
+               if (find_name_in_backref(path, name, name_len, &ref))
+                       goto out;
+
+               old_size = btrfs_item_size_nr(path->nodes[0], path->slots[0]);
+               ret = btrfs_extend_item(trans, root, path, ins_len);
+               BUG_ON(ret);
+               ref = btrfs_item_ptr(path->nodes[0], path->slots[0],
+                                    struct btrfs_inode_ref);
+               ref = (struct btrfs_inode_ref *)((unsigned long)ref + old_size);
+               btrfs_set_inode_ref_name_len(path->nodes[0], ref, name_len);
+               btrfs_set_inode_ref_index(path->nodes[0], ref, index);
+               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],
+                                    struct btrfs_inode_ref);
+               btrfs_set_inode_ref_name_len(path->nodes[0], ref, name_len);
+               btrfs_set_inode_ref_index(path->nodes[0], ref, index);
+               ptr = (unsigned long)(ref + 1);
+       }
+       write_extent_buffer(path->nodes[0], name, ptr, name_len);
+       btrfs_mark_buffer_dirty(path->nodes[0]);
+
+out:
+       btrfs_free_path(path);
+       return ret;
+}
+
 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
                             struct btrfs_root *root,
                             struct btrfs_path *path, u64 objectid)
@@ -32,8 +179,6 @@ int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
 
        ret = btrfs_insert_empty_item(trans, root, path, &key,
                                      sizeof(struct btrfs_inode_item));
-       if (ret == 0 && objectid > root->highest_inode)
-               root->highest_inode = objectid;
        return ret;
 }