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btrfs: add a leak check for roots 

Now that we're going to start relying on getting ref counting right for
roots, add a list to track allocated roots and print out any roots that
aren't freed up at free_fs_info time.

Hide this behind CONFIG_BTRFS_DEBUG because this will just be used for
developers to verify they aren't breaking things.

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Josef Bacik 2020-01-24 09:33:00 -05:00 committed by David Sterba
parent 8260edba67
commit bd647ce385
4 changed files with 42 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
fs/btrfs/ctree.h
View File

@ -947,6 +947,7 @@ struct btrfs_fs_info {
#ifdef CONFIG_BTRFS_DEBUG
struct kobject *debug_kobj;
struct kobject *discard_debug_kobj;
struct list_head allocated_roots;
#endif
};
@ -1149,6 +1150,10 @@ struct btrfs_root {
#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
u64 alloc_bytenr;
#endif
#ifdef CONFIG_BTRFS_DEBUG
struct list_head leak_list;
#endif
};
struct btrfs_clone_extent_info {

28
fs/btrfs/disk-io.c
View File

@ -1202,6 +1202,12 @@ static void __setup_root(struct btrfs_root *root, struct btrfs_fs_info *fs_info,
spin_lock_init(&root->root_item_lock);
btrfs_qgroup_init_swapped_blocks(&root->swapped_blocks);
#ifdef CONFIG_BTRFS_DEBUG
INIT_LIST_HEAD(&root->leak_list);
spin_lock(&fs_info->fs_roots_radix_lock);
list_add_tail(&root->leak_list, &fs_info->allocated_roots);
spin_unlock(&fs_info->fs_roots_radix_lock);
#endif
}
static struct btrfs_root *btrfs_alloc_root(struct btrfs_fs_info *fs_info,
@ -1531,6 +1537,24 @@ int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info,
return ret;
}
void btrfs_check_leaked_roots(struct btrfs_fs_info *fs_info)
{
#ifdef CONFIG_BTRFS_DEBUG
struct btrfs_root *root;
while (!list_empty(&fs_info->allocated_roots)) {
root = list_first_entry(&fs_info->allocated_roots,
struct btrfs_root, leak_list);
btrfs_err(fs_info, "leaked root %llu-%llu refcount %d",
root->root_key.objectid, root->root_key.offset,
refcount_read(&root->refs));
while (refcount_read(&root->refs) > 1)
btrfs_put_fs_root(root);
btrfs_put_fs_root(root);
}
#endif
}
void btrfs_free_fs_info(struct btrfs_fs_info *fs_info)
{
percpu_counter_destroy(&fs_info->dirty_metadata_bytes);
@ -1551,6 +1575,7 @@ void btrfs_free_fs_info(struct btrfs_fs_info *fs_info)
btrfs_put_fs_root(fs_info->uuid_root);
btrfs_put_fs_root(fs_info->free_space_root);
btrfs_put_fs_root(fs_info->fs_root);
btrfs_check_leaked_roots(fs_info);
kfree(fs_info->super_copy);
kfree(fs_info->super_for_commit);
kvfree(fs_info);
@ -2677,6 +2702,9 @@ void btrfs_init_fs_info(struct btrfs_fs_info *fs_info)
INIT_LIST_HEAD(&fs_info->space_info);
INIT_LIST_HEAD(&fs_info->tree_mod_seq_list);
INIT_LIST_HEAD(&fs_info->unused_bgs);
#ifdef CONFIG_BTRFS_DEBUG
INIT_LIST_HEAD(&fs_info->allocated_roots);
#endif
extent_map_tree_init(&fs_info->mapping_tree);
btrfs_init_block_rsv(&fs_info->global_block_rsv,
BTRFS_BLOCK_RSV_GLOBAL);

9
fs/btrfs/disk-io.h
View File

@ -39,6 +39,7 @@ static inline u64 btrfs_sb_offset(int mirror)
struct btrfs_device;
struct btrfs_fs_devices;
void btrfs_check_leaked_roots(struct btrfs_fs_info *fs_info);
void btrfs_init_fs_info(struct btrfs_fs_info *fs_info);
int btrfs_verify_level_key(struct extent_buffer *eb, int level,
struct btrfs_key *first_key, u64 parent_transid);
@ -101,8 +102,14 @@ static inline void btrfs_put_fs_root(struct btrfs_root *root)
{
if (!root)
return;
if (refcount_dec_and_test(&root->refs))
if (refcount_dec_and_test(&root->refs)) {
#ifdef CONFIG_BTRFS_DEBUG
spin_lock(&root->fs_info->fs_roots_radix_lock);
list_del_init(&root->leak_list);
spin_unlock(&root->fs_info->fs_roots_radix_lock);
#endif
kfree(root);
}
}
void btrfs_mark_buffer_dirty(struct extent_buffer *buf);

1
fs/btrfs/tests/btrfs-tests.c
View File

@ -193,6 +193,7 @@ void btrfs_free_dummy_fs_info(struct btrfs_fs_info *fs_info)
btrfs_free_fs_roots(fs_info);
cleanup_srcu_struct(&fs_info->subvol_srcu);
kfree(fs_info->super_copy);
btrfs_check_leaked_roots(fs_info);
kfree(fs_info->fs_devices);
kfree(fs_info);
}