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Btrfs: fix all callers of read_tree_block

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We kept leaking extent buffers when mounting a broken file system and it turns
out it's because not everybody uses read_tree_block properly.  You need to check
and make sure the extent_buffer is uptodate before you use it.  This patch fixes
everybody who calls read_tree_block directly to make sure they check that it is
uptodate and free it and return an error if it is not.  With this we no longer
leak EB's when things go horribly wrong.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fusionio.com>
This commit is contained in:
Josef Bacik
2013-04-23 14:17:42 -04:00
parent 51bf5f0bc4
commit 416bc6580b
5 changed files with 59 additions and 13 deletions
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19
fs/btrfs/disk-io.c
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@@ -1496,6 +1496,14 @@ struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_root *tree_root,
blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
blocksize, generation);
if (!root->node || !extent_buffer_uptodate(root->node)) {
ret = (!root->node) ? -ENOMEM : -EIO;
free_extent_buffer(root->node);
kfree(root);
return ERR_PTR(ret);
}
root->commit_root = btrfs_root_node(root);
BUG_ON(!root->node); /* -ENOMEM */
out:
@@ -2515,8 +2523,8 @@ int open_ctree(struct super_block *sb,
chunk_root->node = read_tree_block(chunk_root,
btrfs_super_chunk_root(disk_super),
blocksize, generation);
BUG_ON(!chunk_root->node); /* -ENOMEM */
if (!test_bit(EXTENT_BUFFER_UPTODATE, &chunk_root->node->bflags)) {
if (!chunk_root->node ||
!test_bit(EXTENT_BUFFER_UPTODATE, &chunk_root->node->bflags)) {
printk(KERN_WARNING "btrfs: failed to read chunk root on %s\n",
sb->s_id);
goto fail_tree_roots;
@@ -2701,6 +2709,13 @@ retry_root_backup:
log_tree_root->node = read_tree_block(tree_root, bytenr,
blocksize,
generation + 1);
if (!log_tree_root->node ||
!extent_buffer_uptodate(log_tree_root->node)) {
printk(KERN_ERR "btrfs: failed to read log tree\n");
free_extent_buffer(log_tree_root->node);
kfree(log_tree_root);
goto fail_trans_kthread;
}
/* returns with log_tree_root freed on success */
ret = btrfs_recover_log_trees(log_tree_root);
if (ret) {