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Diffstat (limited to 'fs/btrfs/tree-log.c')
-rw-r--r--fs/btrfs/tree-log.c112
1 files changed, 109 insertions, 3 deletions
diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c
index f7a18751314a..4c50f823949c 100644
--- a/fs/btrfs/tree-log.c
+++ b/fs/btrfs/tree-log.c
@@ -966,7 +966,9 @@ static noinline int backref_in_log(struct btrfs_root *log,
ptr = btrfs_item_ptr_offset(path->nodes[0], path->slots[0]);
if (key->type == BTRFS_INODE_EXTREF_KEY) {
- if (btrfs_find_name_in_ext_backref(path, ref_objectid,
+ if (btrfs_find_name_in_ext_backref(path->nodes[0],
+ path->slots[0],
+ ref_objectid,
name, namelen, NULL))
match = 1;
@@ -1190,7 +1192,8 @@ static int extref_get_fields(struct extent_buffer *eb, unsigned long ref_ptr,
read_extent_buffer(eb, *name, (unsigned long)&extref->name,
*namelen);
- *index = btrfs_inode_extref_index(eb, extref);
+ if (index)
+ *index = btrfs_inode_extref_index(eb, extref);
if (parent_objectid)
*parent_objectid = btrfs_inode_extref_parent(eb, extref);
@@ -1211,12 +1214,102 @@ static int ref_get_fields(struct extent_buffer *eb, unsigned long ref_ptr,
read_extent_buffer(eb, *name, (unsigned long)(ref + 1), *namelen);
- *index = btrfs_inode_ref_index(eb, ref);
+ if (index)
+ *index = btrfs_inode_ref_index(eb, ref);
return 0;
}
/*
+ * Take an inode reference item from the log tree and iterate all names from the
+ * inode reference item in the subvolume tree with the same key (if it exists).
+ * For any name that is not in the inode reference item from the log tree, do a
+ * proper unlink of that name (that is, remove its entry from the inode
+ * reference item and both dir index keys).
+ */
+static int unlink_old_inode_refs(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_path *path,
+ struct btrfs_inode *inode,
+ struct extent_buffer *log_eb,
+ int log_slot,
+ struct btrfs_key *key)
+{
+ int ret;
+ unsigned long ref_ptr;
+ unsigned long ref_end;
+ struct extent_buffer *eb;
+
+again:
+ btrfs_release_path(path);
+ ret = btrfs_search_slot(NULL, root, key, path, 0, 0);
+ if (ret > 0) {
+ ret = 0;
+ goto out;
+ }
+ if (ret < 0)
+ goto out;
+
+ eb = path->nodes[0];
+ ref_ptr = btrfs_item_ptr_offset(eb, path->slots[0]);
+ ref_end = ref_ptr + btrfs_item_size_nr(eb, path->slots[0]);
+ while (ref_ptr < ref_end) {
+ char *name = NULL;
+ int namelen;
+ u64 parent_id;
+
+ if (key->type == BTRFS_INODE_EXTREF_KEY) {
+ ret = extref_get_fields(eb, ref_ptr, &namelen, &name,
+ NULL, &parent_id);
+ } else {
+ parent_id = key->offset;
+ ret = ref_get_fields(eb, ref_ptr, &namelen, &name,
+ NULL);
+ }
+ if (ret)
+ goto out;
+
+ if (key->type == BTRFS_INODE_EXTREF_KEY)
+ ret = btrfs_find_name_in_ext_backref(log_eb, log_slot,
+ parent_id, name,
+ namelen, NULL);
+ else
+ ret = btrfs_find_name_in_backref(log_eb, log_slot, name,
+ namelen, NULL);
+
+ if (!ret) {
+ struct inode *dir;
+
+ btrfs_release_path(path);
+ dir = read_one_inode(root, parent_id);
+ if (!dir) {
+ ret = -ENOENT;
+ kfree(name);
+ goto out;
+ }
+ ret = btrfs_unlink_inode(trans, root, BTRFS_I(dir),
+ inode, name, namelen);
+ kfree(name);
+ iput(dir);
+ if (ret)
+ goto out;
+ goto again;
+ }
+
+ kfree(name);
+ ref_ptr += namelen;
+ if (key->type == BTRFS_INODE_EXTREF_KEY)
+ ref_ptr += sizeof(struct btrfs_inode_extref);
+ else
+ ref_ptr += sizeof(struct btrfs_inode_ref);
+ }
+ ret = 0;
+ out:
+ btrfs_release_path(path);
+ return ret;
+}
+
+/*
* replay one inode back reference item found in the log tree.
* eb, slot and key refer to the buffer and key found in the log tree.
* root is the destination we are replaying into, and path is for temp
@@ -1344,6 +1437,19 @@ static noinline int add_inode_ref(struct btrfs_trans_handle *trans,
}
}
+ /*
+ * Before we overwrite the inode reference item in the subvolume tree
+ * with the item from the log tree, we must unlink all names from the
+ * parent directory that are in the subvolume's tree inode reference
+ * item, otherwise we end up with an inconsistent subvolume tree where
+ * dir index entries exist for a name but there is no inode reference
+ * item with the same name.
+ */
+ ret = unlink_old_inode_refs(trans, root, path, BTRFS_I(inode), eb, slot,
+ key);
+ if (ret)
+ goto out;
+
/* finally write the back reference in the inode */
ret = overwrite_item(trans, root, path, eb, slot, key);
out: