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btrfs: fix inode rbtree corruption
Node may not be inserted over existing node. This causes inode tree corruption and I was seeing crashes in inode_tree_del which I can not reproduce after this patch. The other way to fix this would be to tie inode lifetime in the rbtree with inode while not in freeing state. I had a look at this but it is not so trivial at this point. At least this patch gets things working again. Signed-off-by: Nick Piggin <npiggin@suse.de> Cc: Chris Mason <chris.mason@oracle.com> Acked-by: Yan Zheng <zheng.yan@oracle.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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df4ecf1524
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03e860bd9f
1 changed files with 14 additions and 7 deletions
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@ -3099,8 +3099,12 @@ static void inode_tree_add(struct inode *inode)
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{
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struct btrfs_root *root = BTRFS_I(inode)->root;
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struct btrfs_inode *entry;
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struct rb_node **p = &root->inode_tree.rb_node;
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struct rb_node *parent = NULL;
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struct rb_node **p;
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struct rb_node *parent;
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again:
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p = &root->inode_tree.rb_node;
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parent = NULL;
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spin_lock(&root->inode_lock);
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while (*p) {
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@ -3108,13 +3112,16 @@ static void inode_tree_add(struct inode *inode)
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entry = rb_entry(parent, struct btrfs_inode, rb_node);
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if (inode->i_ino < entry->vfs_inode.i_ino)
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p = &(*p)->rb_left;
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p = &parent->rb_left;
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else if (inode->i_ino > entry->vfs_inode.i_ino)
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p = &(*p)->rb_right;
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p = &parent->rb_right;
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else {
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WARN_ON(!(entry->vfs_inode.i_state &
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(I_WILL_FREE | I_FREEING | I_CLEAR)));
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break;
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rb_erase(parent, &root->inode_tree);
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RB_CLEAR_NODE(parent);
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spin_unlock(&root->inode_lock);
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goto again;
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}
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}
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rb_link_node(&BTRFS_I(inode)->rb_node, parent, p);
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@ -3126,12 +3133,12 @@ static void inode_tree_del(struct inode *inode)
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{
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struct btrfs_root *root = BTRFS_I(inode)->root;
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if (!RB_EMPTY_NODE(&BTRFS_I(inode)->rb_node)) {
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spin_lock(&root->inode_lock);
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if (!RB_EMPTY_NODE(&BTRFS_I(inode)->rb_node)) {
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rb_erase(&BTRFS_I(inode)->rb_node, &root->inode_tree);
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spin_unlock(&root->inode_lock);
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RB_CLEAR_NODE(&BTRFS_I(inode)->rb_node);
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}
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spin_unlock(&root->inode_lock);
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}
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static noinline void init_btrfs_i(struct inode *inode)
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