Commit 49d11bea authored by Josef Bacik's avatar Josef Bacik Committed by David Sterba

btrfs: add a helper to read the tree_root commit root for backref lookup

I got the following lockdep splat with tree locks converted to rwsem
patches on btrfs/104:

  ======================================================
  WARNING: possible circular locking dependency detected
  5.9.0+ #102 Not tainted
  ------------------------------------------------------
  btrfs-cleaner/903 is trying to acquire lock:
  ffff8e7fab6ffe30 (btrfs-root-00){++++}-{3:3}, at: __btrfs_tree_read_lock+0x32/0x170

  but task is already holding lock:
  ffff8e7fab628a88 (&fs_info->commit_root_sem){++++}-{3:3}, at: btrfs_find_all_roots+0x41/0x80

  which lock already depends on the new lock.

  the existing dependency chain (in reverse order) is:

  -> #3 (&fs_info->commit_root_sem){++++}-{3:3}:
	 down_read+0x40/0x130
	 caching_thread+0x53/0x5a0
	 btrfs_work_helper+0xfa/0x520
	 process_one_work+0x238/0x540
	 worker_thread+0x55/0x3c0
	 kthread+0x13a/0x150
	 ret_from_fork+0x1f/0x30

  -> #2 (&caching_ctl->mutex){+.+.}-{3:3}:
	 __mutex_lock+0x7e/0x7b0
	 btrfs_cache_block_group+0x1e0/0x510
	 find_free_extent+0xb6e/0x12f0
	 btrfs_reserve_extent+0xb3/0x1b0
	 btrfs_alloc_tree_block+0xb1/0x330
	 alloc_tree_block_no_bg_flush+0x4f/0x60
	 __btrfs_cow_block+0x11d/0x580
	 btrfs_cow_block+0x10c/0x220
	 commit_cowonly_roots+0x47/0x2e0
	 btrfs_commit_transaction+0x595/0xbd0
	 sync_filesystem+0x74/0x90
	 generic_shutdown_super+0x22/0x100
	 kill_anon_super+0x14/0x30
	 btrfs_kill_super+0x12/0x20
	 deactivate_locked_super+0x36/0xa0
	 cleanup_mnt+0x12d/0x190
	 task_work_run+0x5c/0xa0
	 exit_to_user_mode_prepare+0x1df/0x200
	 syscall_exit_to_user_mode+0x54/0x280
	 entry_SYSCALL_64_after_hwframe+0x44/0xa9

  -> #1 (&space_info->groups_sem){++++}-{3:3}:
	 down_read+0x40/0x130
	 find_free_extent+0x2ed/0x12f0
	 btrfs_reserve_extent+0xb3/0x1b0
	 btrfs_alloc_tree_block+0xb1/0x330
	 alloc_tree_block_no_bg_flush+0x4f/0x60
	 __btrfs_cow_block+0x11d/0x580
	 btrfs_cow_block+0x10c/0x220
	 commit_cowonly_roots+0x47/0x2e0
	 btrfs_commit_transaction+0x595/0xbd0
	 sync_filesystem+0x74/0x90
	 generic_shutdown_super+0x22/0x100
	 kill_anon_super+0x14/0x30
	 btrfs_kill_super+0x12/0x20
	 deactivate_locked_super+0x36/0xa0
	 cleanup_mnt+0x12d/0x190
	 task_work_run+0x5c/0xa0
	 exit_to_user_mode_prepare+0x1df/0x200
	 syscall_exit_to_user_mode+0x54/0x280
	 entry_SYSCALL_64_after_hwframe+0x44/0xa9

  -> #0 (btrfs-root-00){++++}-{3:3}:
	 __lock_acquire+0x1167/0x2150
	 lock_acquire+0xb9/0x3d0
	 down_read_nested+0x43/0x130
	 __btrfs_tree_read_lock+0x32/0x170
	 __btrfs_read_lock_root_node+0x3a/0x50
	 btrfs_search_slot+0x614/0x9d0
	 btrfs_find_root+0x35/0x1b0
	 btrfs_read_tree_root+0x61/0x120
	 btrfs_get_root_ref+0x14b/0x600
	 find_parent_nodes+0x3e6/0x1b30
	 btrfs_find_all_roots_safe+0xb4/0x130
	 btrfs_find_all_roots+0x60/0x80
	 btrfs_qgroup_trace_extent_post+0x27/0x40
	 btrfs_add_delayed_data_ref+0x3fd/0x460
	 btrfs_free_extent+0x42/0x100
	 __btrfs_mod_ref+0x1d7/0x2f0
	 walk_up_proc+0x11c/0x400
	 walk_up_tree+0xf0/0x180
	 btrfs_drop_snapshot+0x1c7/0x780
	 btrfs_clean_one_deleted_snapshot+0xfb/0x110
	 cleaner_kthread+0xd4/0x140
	 kthread+0x13a/0x150
	 ret_from_fork+0x1f/0x30

  other info that might help us debug this:

  Chain exists of:
    btrfs-root-00 --> &caching_ctl->mutex --> &fs_info->commit_root_sem

   Possible unsafe locking scenario:

	 CPU0                    CPU1
	 ----                    ----
    lock(&fs_info->commit_root_sem);
				 lock(&caching_ctl->mutex);
				 lock(&fs_info->commit_root_sem);
    lock(btrfs-root-00);

   *** DEADLOCK ***

  3 locks held by btrfs-cleaner/903:
   #0: ffff8e7fab628838 (&fs_info->cleaner_mutex){+.+.}-{3:3}, at: cleaner_kthread+0x6e/0x140
   #1: ffff8e7faadac640 (sb_internal){.+.+}-{0:0}, at: start_transaction+0x40b/0x5c0
   #2: ffff8e7fab628a88 (&fs_info->commit_root_sem){++++}-{3:3}, at: btrfs_find_all_roots+0x41/0x80

  stack backtrace:
  CPU: 0 PID: 903 Comm: btrfs-cleaner Not tainted 5.9.0+ #102
  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-2.fc32 04/01/2014
  Call Trace:
   dump_stack+0x8b/0xb0
   check_noncircular+0xcf/0xf0
   __lock_acquire+0x1167/0x2150
   ? __bfs+0x42/0x210
   lock_acquire+0xb9/0x3d0
   ? __btrfs_tree_read_lock+0x32/0x170
   down_read_nested+0x43/0x130
   ? __btrfs_tree_read_lock+0x32/0x170
   __btrfs_tree_read_lock+0x32/0x170
   __btrfs_read_lock_root_node+0x3a/0x50
   btrfs_search_slot+0x614/0x9d0
   ? find_held_lock+0x2b/0x80
   btrfs_find_root+0x35/0x1b0
   ? do_raw_spin_unlock+0x4b/0xa0
   btrfs_read_tree_root+0x61/0x120
   btrfs_get_root_ref+0x14b/0x600
   find_parent_nodes+0x3e6/0x1b30
   btrfs_find_all_roots_safe+0xb4/0x130
   btrfs_find_all_roots+0x60/0x80
   btrfs_qgroup_trace_extent_post+0x27/0x40
   btrfs_add_delayed_data_ref+0x3fd/0x460
   btrfs_free_extent+0x42/0x100
   __btrfs_mod_ref+0x1d7/0x2f0
   walk_up_proc+0x11c/0x400
   walk_up_tree+0xf0/0x180
   btrfs_drop_snapshot+0x1c7/0x780
   ? btrfs_clean_one_deleted_snapshot+0x73/0x110
   btrfs_clean_one_deleted_snapshot+0xfb/0x110
   cleaner_kthread+0xd4/0x140
   ? btrfs_alloc_root+0x50/0x50
   kthread+0x13a/0x150
   ? kthread_create_worker_on_cpu+0x40/0x40
   ret_from_fork+0x1f/0x30
  BTRFS info (device sdb): disk space caching is enabled
  BTRFS info (device sdb): has skinny extents

This happens because qgroups does a backref lookup when we create a
delayed ref.  From here it may have to look up a root from an indirect
ref, which does a normal lookup on the tree_root, which takes the read
lock on the tree_root nodes.

To fix this we need to add a variant for looking up roots that searches
the commit root of the tree_root.  Then when we do the backref search
using the commit root we are sure to not take any locks on the tree_root
nodes.  This gets rid of the lockdep splat when running btrfs/104.
Reviewed-by: default avatarFilipe Manana <fdmanana@suse.com>
Signed-off-by: default avatarJosef Bacik <josef@toxicpanda.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent 5223cc60
......@@ -544,7 +544,18 @@ static int resolve_indirect_ref(struct btrfs_fs_info *fs_info,
int level = ref->level;
struct btrfs_key search_key = ref->key_for_search;
root = btrfs_get_fs_root(fs_info, ref->root_id, false);
/*
* If we're search_commit_root we could possibly be holding locks on
* other tree nodes. This happens when qgroups does backref walks when
* adding new delayed refs. To deal with this we need to look in cache
* for the root, and if we don't find it then we need to search the
* tree_root's commit root, thus the btrfs_get_fs_root_commit_root usage
* here.
*/
if (path->search_commit_root)
root = btrfs_get_fs_root_commit_root(fs_info, path, ref->root_id);
else
root = btrfs_get_fs_root(fs_info, ref->root_id, false);
if (IS_ERR(root)) {
ret = PTR_ERR(root);
goto out_free;
......
......@@ -1281,32 +1281,26 @@ int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
return 0;
}
struct btrfs_root *btrfs_read_tree_root(struct btrfs_root *tree_root,
struct btrfs_key *key)
static struct btrfs_root *read_tree_root_path(struct btrfs_root *tree_root,
struct btrfs_path *path,
struct btrfs_key *key)
{
struct btrfs_root *root;
struct btrfs_fs_info *fs_info = tree_root->fs_info;
struct btrfs_path *path;
u64 generation;
int ret;
int level;
path = btrfs_alloc_path();
if (!path)
return ERR_PTR(-ENOMEM);
root = btrfs_alloc_root(fs_info, key->objectid, GFP_NOFS);
if (!root) {
ret = -ENOMEM;
goto alloc_fail;
}
if (!root)
return ERR_PTR(-ENOMEM);
ret = btrfs_find_root(tree_root, key, path,
&root->root_item, &root->root_key);
if (ret) {
if (ret > 0)
ret = -ENOENT;
goto find_fail;
goto fail;
}
generation = btrfs_root_generation(&root->root_item);
......@@ -1317,21 +1311,31 @@ struct btrfs_root *btrfs_read_tree_root(struct btrfs_root *tree_root,
if (IS_ERR(root->node)) {
ret = PTR_ERR(root->node);
root->node = NULL;
goto find_fail;
goto fail;
} else if (!btrfs_buffer_uptodate(root->node, generation, 0)) {
ret = -EIO;
goto find_fail;
goto fail;
}
root->commit_root = btrfs_root_node(root);
out:
btrfs_free_path(path);
return root;
find_fail:
fail:
btrfs_put_root(root);
alloc_fail:
root = ERR_PTR(ret);
goto out;
return ERR_PTR(ret);
}
struct btrfs_root *btrfs_read_tree_root(struct btrfs_root *tree_root,
struct btrfs_key *key)
{
struct btrfs_root *root;
struct btrfs_path *path;
path = btrfs_alloc_path();
if (!path)
return ERR_PTR(-ENOMEM);
root = read_tree_root_path(tree_root, path, key);
btrfs_free_path(path);
return root;
}
/*
......@@ -1419,6 +1423,31 @@ static struct btrfs_root *btrfs_lookup_fs_root(struct btrfs_fs_info *fs_info,
return root;
}
static struct btrfs_root *btrfs_get_global_root(struct btrfs_fs_info *fs_info,
u64 objectid)
{
if (objectid == BTRFS_ROOT_TREE_OBJECTID)
return btrfs_grab_root(fs_info->tree_root);
if (objectid == BTRFS_EXTENT_TREE_OBJECTID)
return btrfs_grab_root(fs_info->extent_root);
if (objectid == BTRFS_CHUNK_TREE_OBJECTID)
return btrfs_grab_root(fs_info->chunk_root);
if (objectid == BTRFS_DEV_TREE_OBJECTID)
return btrfs_grab_root(fs_info->dev_root);
if (objectid == BTRFS_CSUM_TREE_OBJECTID)
return btrfs_grab_root(fs_info->csum_root);
if (objectid == BTRFS_QUOTA_TREE_OBJECTID)
return btrfs_grab_root(fs_info->quota_root) ?
fs_info->quota_root : ERR_PTR(-ENOENT);
if (objectid == BTRFS_UUID_TREE_OBJECTID)
return btrfs_grab_root(fs_info->uuid_root) ?
fs_info->uuid_root : ERR_PTR(-ENOENT);
if (objectid == BTRFS_FREE_SPACE_TREE_OBJECTID)
return btrfs_grab_root(fs_info->free_space_root) ?
fs_info->free_space_root : ERR_PTR(-ENOENT);
return NULL;
}
int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info,
struct btrfs_root *root)
{
......@@ -1518,25 +1547,9 @@ static struct btrfs_root *btrfs_get_root_ref(struct btrfs_fs_info *fs_info,
struct btrfs_key key;
int ret;
if (objectid == BTRFS_ROOT_TREE_OBJECTID)
return btrfs_grab_root(fs_info->tree_root);
if (objectid == BTRFS_EXTENT_TREE_OBJECTID)
return btrfs_grab_root(fs_info->extent_root);
if (objectid == BTRFS_CHUNK_TREE_OBJECTID)
return btrfs_grab_root(fs_info->chunk_root);
if (objectid == BTRFS_DEV_TREE_OBJECTID)
return btrfs_grab_root(fs_info->dev_root);
if (objectid == BTRFS_CSUM_TREE_OBJECTID)
return btrfs_grab_root(fs_info->csum_root);
if (objectid == BTRFS_QUOTA_TREE_OBJECTID)
return btrfs_grab_root(fs_info->quota_root) ?
fs_info->quota_root : ERR_PTR(-ENOENT);
if (objectid == BTRFS_UUID_TREE_OBJECTID)
return btrfs_grab_root(fs_info->uuid_root) ?
fs_info->uuid_root : ERR_PTR(-ENOENT);
if (objectid == BTRFS_FREE_SPACE_TREE_OBJECTID)
return btrfs_grab_root(fs_info->free_space_root) ?
fs_info->free_space_root : ERR_PTR(-ENOENT);
root = btrfs_get_global_root(fs_info, objectid);
if (root)
return root;
again:
root = btrfs_lookup_fs_root(fs_info, objectid);
if (root) {
......@@ -1621,6 +1634,52 @@ struct btrfs_root *btrfs_get_new_fs_root(struct btrfs_fs_info *fs_info,
return btrfs_get_root_ref(fs_info, objectid, anon_dev, true);
}
/*
* btrfs_get_fs_root_commit_root - return a root for the given objectid
* @fs_info: the fs_info
* @objectid: the objectid we need to lookup
*
* This is exclusively used for backref walking, and exists specifically because
* of how qgroups does lookups. Qgroups will do a backref lookup at delayed ref
* creation time, which means we may have to read the tree_root in order to look
* up a fs root that is not in memory. If the root is not in memory we will
* read the tree root commit root and look up the fs root from there. This is a
* temporary root, it will not be inserted into the radix tree as it doesn't
* have the most uptodate information, it'll simply be discarded once the
* backref code is finished using the root.
*/
struct btrfs_root *btrfs_get_fs_root_commit_root(struct btrfs_fs_info *fs_info,
struct btrfs_path *path,
u64 objectid)
{
struct btrfs_root *root;
struct btrfs_key key;
ASSERT(path->search_commit_root && path->skip_locking);
/*
* This can return -ENOENT if we ask for a root that doesn't exist, but
* since this is called via the backref walking code we won't be looking
* up a root that doesn't exist, unless there's corruption. So if root
* != NULL just return it.
*/
root = btrfs_get_global_root(fs_info, objectid);
if (root)
return root;
root = btrfs_lookup_fs_root(fs_info, objectid);
if (root)
return root;
key.objectid = objectid;
key.type = BTRFS_ROOT_ITEM_KEY;
key.offset = (u64)-1;
root = read_tree_root_path(fs_info->tree_root, path, &key);
btrfs_release_path(path);
return root;
}
/*
* called by the kthread helper functions to finally call the bio end_io
* functions. This is where read checksum verification actually happens
......
......@@ -69,6 +69,9 @@ struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info,
u64 objectid, bool check_ref);
struct btrfs_root *btrfs_get_new_fs_root(struct btrfs_fs_info *fs_info,
u64 objectid, dev_t anon_dev);
struct btrfs_root *btrfs_get_fs_root_commit_root(struct btrfs_fs_info *fs_info,
struct btrfs_path *path,
u64 objectid);
void btrfs_free_fs_info(struct btrfs_fs_info *fs_info);
int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info);
......
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