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Diffstat (limited to 'fs/btrfs/backref.c')
-rw-r--r--fs/btrfs/backref.c87
1 files changed, 40 insertions, 47 deletions
diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c
index bd605c87adf..b4fb4155811 100644
--- a/fs/btrfs/backref.c
+++ b/fs/btrfs/backref.c
@@ -352,6 +352,8 @@ static int __resolve_indirect_refs(struct btrfs_fs_info *fs_info,
err = __resolve_indirect_ref(fs_info, search_commit_root,
time_seq, ref, parents,
extent_item_pos);
+ if (err == -ENOMEM)
+ goto out;
if (err)
continue;
@@ -367,7 +369,7 @@ static int __resolve_indirect_refs(struct btrfs_fs_info *fs_info,
new_ref = kmalloc(sizeof(*new_ref), GFP_NOFS);
if (!new_ref) {
ret = -ENOMEM;
- break;
+ goto out;
}
memcpy(new_ref, ref, sizeof(*ref));
new_ref->parent = node->val;
@@ -377,7 +379,7 @@ static int __resolve_indirect_refs(struct btrfs_fs_info *fs_info,
}
ulist_reinit(parents);
}
-
+out:
ulist_free(parents);
return ret;
}
@@ -421,7 +423,10 @@ static int __add_missing_keys(struct btrfs_fs_info *fs_info,
BUG_ON(!ref->wanted_disk_byte);
eb = read_tree_block(fs_info->tree_root, ref->wanted_disk_byte,
fs_info->tree_root->leafsize, 0);
- BUG_ON(!eb);
+ if (!eb || !extent_buffer_uptodate(eb)) {
+ free_extent_buffer(eb);
+ return -EIO;
+ }
btrfs_tree_read_lock(eb);
if (btrfs_header_level(eb) == 0)
btrfs_item_key_to_cpu(eb, &ref->key_for_search, 0);
@@ -443,7 +448,7 @@ static int __add_missing_keys(struct btrfs_fs_info *fs_info,
* having a parent).
* mode = 2: merge identical parents
*/
-static int __merge_refs(struct list_head *head, int mode)
+static void __merge_refs(struct list_head *head, int mode)
{
struct list_head *pos1;
@@ -489,7 +494,6 @@ static int __merge_refs(struct list_head *head, int mode)
}
}
- return 0;
}
/*
@@ -582,7 +586,8 @@ static int __add_delayed_refs(struct btrfs_delayed_ref_head *head, u64 seq,
default:
WARN_ON(1);
}
- BUG_ON(ret);
+ if (ret)
+ return ret;
}
return 0;
@@ -680,7 +685,8 @@ static int __add_inline_refs(struct btrfs_fs_info *fs_info,
default:
WARN_ON(1);
}
- BUG_ON(ret);
+ if (ret)
+ return ret;
ptr += btrfs_extent_inline_ref_size(type);
}
@@ -762,7 +768,9 @@ static int __add_keyed_refs(struct btrfs_fs_info *fs_info,
default:
WARN_ON(1);
}
- BUG_ON(ret);
+ if (ret)
+ return ret;
+
}
return ret;
@@ -880,18 +888,14 @@ again:
if (ret)
goto out;
- ret = __merge_refs(&prefs, 1);
- if (ret)
- goto out;
+ __merge_refs(&prefs, 1);
ret = __resolve_indirect_refs(fs_info, search_commit_root, time_seq,
&prefs, extent_item_pos);
if (ret)
goto out;
- ret = __merge_refs(&prefs, 2);
- if (ret)
- goto out;
+ __merge_refs(&prefs, 2);
while (!list_empty(&prefs)) {
ref = list_first_entry(&prefs, struct __prelim_ref, list);
@@ -900,7 +904,8 @@ again:
if (ref->count && ref->root_id && ref->parent == 0) {
/* no parent == root of tree */
ret = ulist_add(roots, ref->root_id, 0, GFP_NOFS);
- BUG_ON(ret < 0);
+ if (ret < 0)
+ goto out;
}
if (ref->count && ref->parent) {
struct extent_inode_elem *eie = NULL;
@@ -911,7 +916,10 @@ again:
info_level);
eb = read_tree_block(fs_info->extent_root,
ref->parent, bsz, 0);
- BUG_ON(!eb);
+ if (!eb || !extent_buffer_uptodate(eb)) {
+ free_extent_buffer(eb);
+ return -EIO;
+ }
ret = find_extent_in_eb(eb, bytenr,
*extent_item_pos, &eie);
ref->inode_list = eie;
@@ -920,6 +928,8 @@ again:
ret = ulist_add_merge(refs, ref->parent,
(uintptr_t)ref->inode_list,
(u64 *)&eie, GFP_NOFS);
+ if (ret < 0)
+ goto out;
if (!ret && extent_item_pos) {
/*
* we've recorded that parent, so we must extend
@@ -930,7 +940,6 @@ again:
eie = eie->next;
eie->next = ref->inode_list;
}
- BUG_ON(ret < 0);
}
kfree(ref);
}
@@ -1180,6 +1189,20 @@ int btrfs_find_one_extref(struct btrfs_root *root, u64 inode_objectid,
return ret;
}
+/*
+ * this iterates to turn a name (from iref/extref) into a full filesystem path.
+ * Elements of the path are separated by '/' and the path is guaranteed to be
+ * 0-terminated. the path is only given within the current file system.
+ * Therefore, it never starts with a '/'. the caller is responsible to provide
+ * "size" bytes in "dest". the dest buffer will be filled backwards. finally,
+ * the start point of the resulting string is returned. this pointer is within
+ * dest, normally.
+ * in case the path buffer would overflow, the pointer is decremented further
+ * as if output was written to the buffer, though no more output is actually
+ * generated. that way, the caller can determine how much space would be
+ * required for the path to fit into the buffer. in that case, the returned
+ * value will be smaller than dest. callers must check this!
+ */
char *btrfs_ref_to_path(struct btrfs_root *fs_root, struct btrfs_path *path,
u32 name_len, unsigned long name_off,
struct extent_buffer *eb_in, u64 parent,
@@ -1249,32 +1272,6 @@ char *btrfs_ref_to_path(struct btrfs_root *fs_root, struct btrfs_path *path,
}
/*
- * this iterates to turn a btrfs_inode_ref into a full filesystem path. elements
- * of the path are separated by '/' and the path is guaranteed to be
- * 0-terminated. the path is only given within the current file system.
- * Therefore, it never starts with a '/'. the caller is responsible to provide
- * "size" bytes in "dest". the dest buffer will be filled backwards. finally,
- * the start point of the resulting string is returned. this pointer is within
- * dest, normally.
- * in case the path buffer would overflow, the pointer is decremented further
- * as if output was written to the buffer, though no more output is actually
- * generated. that way, the caller can determine how much space would be
- * required for the path to fit into the buffer. in that case, the returned
- * value will be smaller than dest. callers must check this!
- */
-char *btrfs_iref_to_path(struct btrfs_root *fs_root,
- struct btrfs_path *path,
- struct btrfs_inode_ref *iref,
- struct extent_buffer *eb_in, u64 parent,
- char *dest, u32 size)
-{
- return btrfs_ref_to_path(fs_root, path,
- btrfs_inode_ref_name_len(eb_in, iref),
- (unsigned long)(iref + 1),
- eb_in, parent, dest, size);
-}
-
-/*
* this makes the path point to (logical EXTENT_ITEM *)
* returns BTRFS_EXTENT_FLAG_DATA for data, BTRFS_EXTENT_FLAG_TREE_BLOCK for
* tree blocks and <0 on error.
@@ -1461,8 +1458,6 @@ int iterate_extent_inodes(struct btrfs_fs_info *fs_info,
iterate_extent_inodes_t *iterate, void *ctx)
{
int ret;
- struct list_head data_refs = LIST_HEAD_INIT(data_refs);
- struct list_head shared_refs = LIST_HEAD_INIT(shared_refs);
struct btrfs_trans_handle *trans;
struct ulist *refs = NULL;
struct ulist *roots = NULL;
@@ -1508,11 +1503,9 @@ int iterate_extent_inodes(struct btrfs_fs_info *fs_info,
iterate, ctx);
}
ulist_free(roots);
- roots = NULL;
}
free_leaf_list(refs);
- ulist_free(roots);
out:
if (!search_commit_root) {
btrfs_put_tree_mod_seq(fs_info, &tree_mod_seq_elem);
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-04 00:08:44 +0000