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btrfs: Panic on bad rbtree operations

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The ordered data and relocation trees have BUG_ONs to protect against
bad tree operations.

This patch replaces them with a panic that will report the problem.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
This commit is contained in:
Jeff Mahoney
2011-10-03 23:22:33 -04:00
committed by David Sterba
parent c2d904e086
commit 43c04fb1b8
2 changed files with 39 additions and 9 deletions
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36
fs/btrfs/relocation.c
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@@ -326,6 +326,19 @@ static struct rb_node *tree_search(struct rb_root *root, u64 bytenr)
return NULL;
}
void backref_tree_panic(struct rb_node *rb_node, int errno,
u64 bytenr)
{
struct btrfs_fs_info *fs_info = NULL;
struct backref_node *bnode = rb_entry(rb_node, struct backref_node,
rb_node);
if (bnode->root)
fs_info = bnode->root->fs_info;
btrfs_panic(fs_info, errno, "Inconsistency in backref cache "
"found at offset %llu\n", (unsigned long long)bytenr);
}
/*
* walk up backref nodes until reach node presents tree root
*/
@@ -452,7 +465,8 @@ static void update_backref_node(struct backref_cache *cache,
rb_erase(&node->rb_node, &cache->rb_root);
node->bytenr = bytenr;
rb_node = tree_insert(&cache->rb_root, node->bytenr, &node->rb_node);
BUG_ON(rb_node);
if (rb_node)
backref_tree_panic(rb_node, -EEXIST, bytenr);
}
/*
@@ -999,7 +1013,8 @@ next:
if (!cowonly) {
rb_node = tree_insert(&cache->rb_root, node->bytenr,
&node->rb_node);
BUG_ON(rb_node);
if (rb_node)
backref_tree_panic(rb_node, -EEXIST, node->bytenr);
list_add_tail(&node->lower, &cache->leaves);
}
@@ -1034,7 +1049,9 @@ next:
if (!cowonly) {
rb_node = tree_insert(&cache->rb_root, upper->bytenr,
&upper->rb_node);
BUG_ON(rb_node);
if (rb_node)
backref_tree_panic(rb_node, -EEXIST,
upper->bytenr);
}
list_add_tail(&edge->list[UPPER], &upper->lower);
@@ -1180,7 +1197,8 @@ static int clone_backref_node(struct btrfs_trans_handle *trans,
rb_node = tree_insert(&cache->rb_root, new_node->bytenr,
&new_node->rb_node);
BUG_ON(rb_node);
if (rb_node)
backref_tree_panic(rb_node, -EEXIST, new_node->bytenr);
if (!new_node->lowest) {
list_for_each_entry(new_edge, &new_node->lower, list[UPPER]) {
@@ -1252,7 +1270,8 @@ static int __update_reloc_root(struct btrfs_root *root, int del)
rb_node = tree_insert(&rc->reloc_root_tree.rb_root,
node->bytenr, &node->rb_node);
spin_unlock(&rc->reloc_root_tree.lock);
BUG_ON(rb_node);
if (rb_node)
backref_tree_panic(rb_node, -EEXIST, node->bytenr);
} else {
list_del_init(&root->root_list);
kfree(node);
@@ -3154,7 +3173,8 @@ static int add_tree_block(struct reloc_control *rc,
block->key_ready = 0;
rb_node = tree_insert(blocks, block->bytenr, &block->rb_node);
BUG_ON(rb_node);
if (rb_node)
backref_tree_panic(rb_node, -EEXIST, block->bytenr);
return 0;
}
@@ -3426,7 +3446,9 @@ static int find_data_references(struct reloc_control *rc,
block->key_ready = 1;
rb_node = tree_insert(blocks, block->bytenr,
&block->rb_node);
BUG_ON(rb_node);
if (rb_node)
backref_tree_panic(rb_node, -EEXIST,
block->bytenr);
}
if (counted)
added = 1;