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Btrfs: fix regression running delayed references when using qgroups
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commit b06c4bf upstream.

In the kernel 4.2 merge window we had a big changes to the implementation
of delayed references and qgroups which made the no_quota field of delayed
references not used anymore. More specifically the no_quota field is not
used anymore as of:

  commit 0ed4792 ("btrfs: qgroup: Switch to new extent-oriented qgroup mechanism.")

Leaving the no_quota field actually prevents delayed references from
getting merged, which in turn cause the following BUG_ON(), at
fs/btrfs/extent-tree.c, to be hit when qgroups are enabled:

  static int run_delayed_tree_ref(...)
  {
     (...)
     BUG_ON(node->ref_mod != 1);
     (...)
  }

This happens on a scenario like the following:

  1) Ref1 bytenr X, action = BTRFS_ADD_DELAYED_REF, no_quota = 1, added.

  2) Ref2 bytenr X, action = BTRFS_DROP_DELAYED_REF, no_quota = 0, added.
     It's not merged with Ref1 because Ref1->no_quota != Ref2->no_quota.

  3) Ref3 bytenr X, action = BTRFS_ADD_DELAYED_REF, no_quota = 1, added.
     It's not merged with the reference at the tail of the list of refs
     for bytenr X because the reference at the tail, Ref2 is incompatible
     due to Ref2->no_quota != Ref3->no_quota.

  4) Ref4 bytenr X, action = BTRFS_DROP_DELAYED_REF, no_quota = 0, added.
     It's not merged with the reference at the tail of the list of refs
     for bytenr X because the reference at the tail, Ref3 is incompatible
     due to Ref3->no_quota != Ref4->no_quota.

  5) We run delayed references, trigger merging of delayed references,
     through __btrfs_run_delayed_refs() -> btrfs_merge_delayed_refs().

  6) Ref1 and Ref3 are merged as Ref1->no_quota = Ref3->no_quota and
     all other conditions are satisfied too. So Ref1 gets a ref_mod
     value of 2.

  7) Ref2 and Ref4 are merged as Ref2->no_quota = Ref4->no_quota and
     all other conditions are satisfied too. So Ref2 gets a ref_mod
     value of 2.

  8) Ref1 and Ref2 aren't merged, because they have different values
     for their no_quota field.

  9) Delayed reference Ref1 is picked for running (select_delayed_ref()
     always prefers references with an action == BTRFS_ADD_DELAYED_REF).
     So run_delayed_tree_ref() is called for Ref1 which triggers the
     BUG_ON because Ref1->red_mod != 1 (equals 2).

So fix this by removing the no_quota field, as it's not used anymore as
of commit 0ed4792 ("btrfs: qgroup: Switch to new extent-oriented
qgroup mechanism.").

The use of no_quota was also buggy in at least two places:

1) At delayed-refs.c:btrfs_add_delayed_tree_ref() - we were setting
   no_quota to 0 instead of 1 when the following condition was true:
   is_fstree(ref_root) || !fs_info->quota_enabled

2) At extent-tree.c:__btrfs_inc_extent_ref() - we were attempting to
   reset a node's no_quota when the condition "!is_fstree(root_objectid)
   || !root->fs_info->quota_enabled" was true but we did it only in
   an unused local stack variable, that is, we never reset the no_quota
   value in the node itself.

This fixes the remainder of problems several people have been having when
running delayed references, mostly while a balance is running in parallel,
on a 4.2+ kernel.

Very special thanks to Stéphane Lesimple for helping debugging this issue
and testing this fix on his multi terabyte filesystem (which took more
than one day to balance alone, plus fsck, etc).

Also, this fixes deadlock issue when using the clone ioctl with qgroups
enabled, as reported by Elias Probst in the mailing list. The deadlock
happens because after calling btrfs_insert_empty_item we have our path
holding a write lock on a leaf of the fs/subvol tree and then before
releasing the path we called check_ref() which did backref walking, when
qgroups are enabled, and tried to read lock the same leaf. The trace for
this case is the following:

  INFO: task systemd-nspawn:6095 blocked for more than 120 seconds.
  (...)
  Call Trace:
    [<ffffffff86999201>] schedule+0x74/0x83
    [<ffffffff863ef64c>] btrfs_tree_read_lock+0xc0/0xea
    [<ffffffff86137ed7>] ? wait_woken+0x74/0x74
    [<ffffffff8639f0a7>] btrfs_search_old_slot+0x51a/0x810
    [<ffffffff863a129b>] btrfs_next_old_leaf+0xdf/0x3ce
    [<ffffffff86413a00>] ? ulist_add_merge+0x1b/0x127
    [<ffffffff86411688>] __resolve_indirect_refs+0x62a/0x667
    [<ffffffff863ef546>] ? btrfs_clear_lock_blocking_rw+0x78/0xbe
    [<ffffffff864122d3>] find_parent_nodes+0xaf3/0xfc6
    [<ffffffff86412838>] __btrfs_find_all_roots+0x92/0xf0
    [<ffffffff864128f2>] btrfs_find_all_roots+0x45/0x65
    [<ffffffff8639a75b>] ? btrfs_get_tree_mod_seq+0x2b/0x88
    [<ffffffff863e852e>] check_ref+0x64/0xc4
    [<ffffffff863e9e01>] btrfs_clone+0x66e/0xb5d
    [<ffffffff863ea77f>] btrfs_ioctl_clone+0x48f/0x5bb
    [<ffffffff86048a68>] ? native_sched_clock+0x28/0x77
    [<ffffffff863ed9b0>] btrfs_ioctl+0xabc/0x25cb
  (...)

The problem goes away by eleminating check_ref(), which no longer is
needed as its purpose was to get a value for the no_quota field of
a delayed reference (this patch removes the no_quota field as mentioned
earlier).

Reported-by: Stéphane Lesimple <stephane_btrfs@lesimple.fr>
Tested-by: Stéphane Lesimple <stephane_btrfs@lesimple.fr>
Reported-by: Elias Probst <mail@eliasprobst.eu>
Reported-by: Peter Becker <floyd.net@gmail.com>
Reported-by: Malte Schröder <malte@tnxip.de>
Reported-by: Derek Dongray <derek@valedon.co.uk>
Reported-by: Erkki Seppala <flux-btrfs@inside.org>
Cc: stable@vger.kernel.org  # 4.2+
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
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Filipe Manana authored and Greg Kroah-Hartman committed Dec 15, 2015
1 parent 25c386d commit dacd97b
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Showing 9 changed files with 44 additions and 134 deletions.
4 changes: 2 additions & 2 deletions fs/btrfs/ctree.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -3404,7 +3404,7 @@ int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans,
int btrfs_free_extent(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
u64 bytenr, u64 num_bytes, u64 parent, u64 root_objectid,
u64 owner, u64 offset, int no_quota);
u64 owner, u64 offset);

int btrfs_free_reserved_extent(struct btrfs_root *root, u64 start, u64 len,
int delalloc);
Expand All @@ -3417,7 +3417,7 @@ int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
u64 bytenr, u64 num_bytes, u64 parent,
u64 root_objectid, u64 owner, u64 offset, int no_quota);
u64 root_objectid, u64 owner, u64 offset);

int btrfs_start_dirty_block_groups(struct btrfs_trans_handle *trans,
struct btrfs_root *root);
Expand Down
28 changes: 8 additions & 20 deletions fs/btrfs/delayed-ref.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -220,7 +220,7 @@ static bool merge_ref(struct btrfs_trans_handle *trans,
if (seq && next->seq >= seq)
goto next;

if (next->type != ref->type || next->no_quota != ref->no_quota)
if (next->type != ref->type)
goto next;

if ((ref->type == BTRFS_TREE_BLOCK_REF_KEY ||
Expand Down Expand Up @@ -405,8 +405,7 @@ add_delayed_ref_tail_merge(struct btrfs_trans_handle *trans,
exist = list_entry(href->ref_list.prev, struct btrfs_delayed_ref_node,
list);
/* No need to compare bytenr nor is_head */
if (exist->type != ref->type || exist->no_quota != ref->no_quota ||
exist->seq != ref->seq)
if (exist->type != ref->type || exist->seq != ref->seq)
goto add_tail;

if ((exist->type == BTRFS_TREE_BLOCK_REF_KEY ||
Expand Down Expand Up @@ -637,7 +636,7 @@ add_delayed_tree_ref(struct btrfs_fs_info *fs_info,
struct btrfs_delayed_ref_head *head_ref,
struct btrfs_delayed_ref_node *ref, u64 bytenr,
u64 num_bytes, u64 parent, u64 ref_root, int level,
int action, int no_quota)
int action)
{
struct btrfs_delayed_tree_ref *full_ref;
struct btrfs_delayed_ref_root *delayed_refs;
Expand All @@ -659,7 +658,6 @@ add_delayed_tree_ref(struct btrfs_fs_info *fs_info,
ref->action = action;
ref->is_head = 0;
ref->in_tree = 1;
ref->no_quota = no_quota;
ref->seq = seq;

full_ref = btrfs_delayed_node_to_tree_ref(ref);
Expand Down Expand Up @@ -692,7 +690,7 @@ add_delayed_data_ref(struct btrfs_fs_info *fs_info,
struct btrfs_delayed_ref_head *head_ref,
struct btrfs_delayed_ref_node *ref, u64 bytenr,
u64 num_bytes, u64 parent, u64 ref_root, u64 owner,
u64 offset, int action, int no_quota)
u64 offset, int action)
{
struct btrfs_delayed_data_ref *full_ref;
struct btrfs_delayed_ref_root *delayed_refs;
Expand All @@ -715,7 +713,6 @@ add_delayed_data_ref(struct btrfs_fs_info *fs_info,
ref->action = action;
ref->is_head = 0;
ref->in_tree = 1;
ref->no_quota = no_quota;
ref->seq = seq;

full_ref = btrfs_delayed_node_to_data_ref(ref);
Expand Down Expand Up @@ -746,17 +743,13 @@ int btrfs_add_delayed_tree_ref(struct btrfs_fs_info *fs_info,
struct btrfs_trans_handle *trans,
u64 bytenr, u64 num_bytes, u64 parent,
u64 ref_root, int level, int action,
struct btrfs_delayed_extent_op *extent_op,
int no_quota)
struct btrfs_delayed_extent_op *extent_op)
{
struct btrfs_delayed_tree_ref *ref;
struct btrfs_delayed_ref_head *head_ref;
struct btrfs_delayed_ref_root *delayed_refs;
struct btrfs_qgroup_extent_record *record = NULL;

if (!is_fstree(ref_root) || !fs_info->quota_enabled)
no_quota = 0;

BUG_ON(extent_op && extent_op->is_data);
ref = kmem_cache_alloc(btrfs_delayed_tree_ref_cachep, GFP_NOFS);
if (!ref)
Expand Down Expand Up @@ -785,8 +778,7 @@ int btrfs_add_delayed_tree_ref(struct btrfs_fs_info *fs_info,
bytenr, num_bytes, action, 0);

add_delayed_tree_ref(fs_info, trans, head_ref, &ref->node, bytenr,
num_bytes, parent, ref_root, level, action,
no_quota);
num_bytes, parent, ref_root, level, action);
spin_unlock(&delayed_refs->lock);

return 0;
Expand All @@ -807,17 +799,13 @@ int btrfs_add_delayed_data_ref(struct btrfs_fs_info *fs_info,
u64 bytenr, u64 num_bytes,
u64 parent, u64 ref_root,
u64 owner, u64 offset, int action,
struct btrfs_delayed_extent_op *extent_op,
int no_quota)
struct btrfs_delayed_extent_op *extent_op)
{
struct btrfs_delayed_data_ref *ref;
struct btrfs_delayed_ref_head *head_ref;
struct btrfs_delayed_ref_root *delayed_refs;
struct btrfs_qgroup_extent_record *record = NULL;

if (!is_fstree(ref_root) || !fs_info->quota_enabled)
no_quota = 0;

BUG_ON(extent_op && !extent_op->is_data);
ref = kmem_cache_alloc(btrfs_delayed_data_ref_cachep, GFP_NOFS);
if (!ref)
Expand Down Expand Up @@ -853,7 +841,7 @@ int btrfs_add_delayed_data_ref(struct btrfs_fs_info *fs_info,

add_delayed_data_ref(fs_info, trans, head_ref, &ref->node, bytenr,
num_bytes, parent, ref_root, owner, offset,
action, no_quota);
action);
spin_unlock(&delayed_refs->lock);

return 0;
Expand Down
7 changes: 2 additions & 5 deletions fs/btrfs/delayed-ref.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -68,7 +68,6 @@ struct btrfs_delayed_ref_node {

unsigned int action:8;
unsigned int type:8;
unsigned int no_quota:1;
/* is this node still in the rbtree? */
unsigned int is_head:1;
unsigned int in_tree:1;
Expand Down Expand Up @@ -233,15 +232,13 @@ int btrfs_add_delayed_tree_ref(struct btrfs_fs_info *fs_info,
struct btrfs_trans_handle *trans,
u64 bytenr, u64 num_bytes, u64 parent,
u64 ref_root, int level, int action,
struct btrfs_delayed_extent_op *extent_op,
int no_quota);
struct btrfs_delayed_extent_op *extent_op);
int btrfs_add_delayed_data_ref(struct btrfs_fs_info *fs_info,
struct btrfs_trans_handle *trans,
u64 bytenr, u64 num_bytes,
u64 parent, u64 ref_root,
u64 owner, u64 offset, int action,
struct btrfs_delayed_extent_op *extent_op,
int no_quota);
struct btrfs_delayed_extent_op *extent_op);
int btrfs_add_delayed_extent_op(struct btrfs_fs_info *fs_info,
struct btrfs_trans_handle *trans,
u64 bytenr, u64 num_bytes,
Expand Down
45 changes: 16 additions & 29 deletions fs/btrfs/extent-tree.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -95,8 +95,7 @@ static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
u64 parent, u64 root_objectid,
u64 flags, struct btrfs_disk_key *key,
int level, struct btrfs_key *ins,
int no_quota);
int level, struct btrfs_key *ins);
static int do_chunk_alloc(struct btrfs_trans_handle *trans,
struct btrfs_root *extent_root, u64 flags,
int force);
Expand Down Expand Up @@ -1941,8 +1940,7 @@ int btrfs_discard_extent(struct btrfs_root *root, u64 bytenr,
int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
u64 bytenr, u64 num_bytes, u64 parent,
u64 root_objectid, u64 owner, u64 offset,
int no_quota)
u64 root_objectid, u64 owner, u64 offset)
{
int ret;
struct btrfs_fs_info *fs_info = root->fs_info;
Expand All @@ -1954,12 +1952,12 @@ int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
ret = btrfs_add_delayed_tree_ref(fs_info, trans, bytenr,
num_bytes,
parent, root_objectid, (int)owner,
BTRFS_ADD_DELAYED_REF, NULL, no_quota);
BTRFS_ADD_DELAYED_REF, NULL);
} else {
ret = btrfs_add_delayed_data_ref(fs_info, trans, bytenr,
num_bytes,
parent, root_objectid, owner, offset,
BTRFS_ADD_DELAYED_REF, NULL, no_quota);
BTRFS_ADD_DELAYED_REF, NULL);
}
return ret;
}
Expand All @@ -1980,15 +1978,11 @@ static int __btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
u64 num_bytes = node->num_bytes;
u64 refs;
int ret;
int no_quota = node->no_quota;

path = btrfs_alloc_path();
if (!path)
return -ENOMEM;

if (!is_fstree(root_objectid) || !root->fs_info->quota_enabled)
no_quota = 1;

path->reada = 1;
path->leave_spinning = 1;
/* this will setup the path even if it fails to insert the back ref */
Expand Down Expand Up @@ -2223,8 +2217,7 @@ static int run_delayed_tree_ref(struct btrfs_trans_handle *trans,
parent, ref_root,
extent_op->flags_to_set,
&extent_op->key,
ref->level, &ins,
node->no_quota);
ref->level, &ins);
} else if (node->action == BTRFS_ADD_DELAYED_REF) {
ret = __btrfs_inc_extent_ref(trans, root, node,
parent, ref_root,
Expand Down Expand Up @@ -3052,7 +3045,7 @@ static int __btrfs_mod_ref(struct btrfs_trans_handle *trans,
int level;
int ret = 0;
int (*process_func)(struct btrfs_trans_handle *, struct btrfs_root *,
u64, u64, u64, u64, u64, u64, int);
u64, u64, u64, u64, u64, u64);


if (btrfs_test_is_dummy_root(root))
Expand Down Expand Up @@ -3093,15 +3086,14 @@ static int __btrfs_mod_ref(struct btrfs_trans_handle *trans,
key.offset -= btrfs_file_extent_offset(buf, fi);
ret = process_func(trans, root, bytenr, num_bytes,
parent, ref_root, key.objectid,
key.offset, 1);
key.offset);
if (ret)
goto fail;
} else {
bytenr = btrfs_node_blockptr(buf, i);
num_bytes = root->nodesize;
ret = process_func(trans, root, bytenr, num_bytes,
parent, ref_root, level - 1, 0,
1);
parent, ref_root, level - 1, 0);
if (ret)
goto fail;
}
Expand Down Expand Up @@ -6151,7 +6143,6 @@ static int __btrfs_free_extent(struct btrfs_trans_handle *trans,
int extent_slot = 0;
int found_extent = 0;
int num_to_del = 1;
int no_quota = node->no_quota;
u32 item_size;
u64 refs;
u64 bytenr = node->bytenr;
Expand All @@ -6160,9 +6151,6 @@ static int __btrfs_free_extent(struct btrfs_trans_handle *trans,
bool skinny_metadata = btrfs_fs_incompat(root->fs_info,
SKINNY_METADATA);

if (!info->quota_enabled || !is_fstree(root_objectid))
no_quota = 1;

path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
Expand Down Expand Up @@ -6488,7 +6476,7 @@ void btrfs_free_tree_block(struct btrfs_trans_handle *trans,
buf->start, buf->len,
parent, root->root_key.objectid,
btrfs_header_level(buf),
BTRFS_DROP_DELAYED_REF, NULL, 0);
BTRFS_DROP_DELAYED_REF, NULL);
BUG_ON(ret); /* -ENOMEM */
}

Expand Down Expand Up @@ -6536,7 +6524,7 @@ void btrfs_free_tree_block(struct btrfs_trans_handle *trans,
/* Can return -ENOMEM */
int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root *root,
u64 bytenr, u64 num_bytes, u64 parent, u64 root_objectid,
u64 owner, u64 offset, int no_quota)
u64 owner, u64 offset)
{
int ret;
struct btrfs_fs_info *fs_info = root->fs_info;
Expand All @@ -6559,13 +6547,13 @@ int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root *root,
ret = btrfs_add_delayed_tree_ref(fs_info, trans, bytenr,
num_bytes,
parent, root_objectid, (int)owner,
BTRFS_DROP_DELAYED_REF, NULL, no_quota);
BTRFS_DROP_DELAYED_REF, NULL);
} else {
ret = btrfs_add_delayed_data_ref(fs_info, trans, bytenr,
num_bytes,
parent, root_objectid, owner,
offset, BTRFS_DROP_DELAYED_REF,
NULL, no_quota);
NULL);
}
return ret;
}
Expand Down Expand Up @@ -7347,8 +7335,7 @@ static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
u64 parent, u64 root_objectid,
u64 flags, struct btrfs_disk_key *key,
int level, struct btrfs_key *ins,
int no_quota)
int level, struct btrfs_key *ins)
{
int ret;
struct btrfs_fs_info *fs_info = root->fs_info;
Expand Down Expand Up @@ -7438,7 +7425,7 @@ int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans,
ret = btrfs_add_delayed_data_ref(root->fs_info, trans, ins->objectid,
ins->offset, 0,
root_objectid, owner, offset,
BTRFS_ADD_DELAYED_EXTENT, NULL, 0);
BTRFS_ADD_DELAYED_EXTENT, NULL);
return ret;
}

Expand Down Expand Up @@ -7655,7 +7642,7 @@ struct extent_buffer *btrfs_alloc_tree_block(struct btrfs_trans_handle *trans,
ins.objectid, ins.offset,
parent, root_objectid, level,
BTRFS_ADD_DELAYED_EXTENT,
extent_op, 0);
extent_op);
if (ret)
goto out_free_delayed;
}
Expand Down Expand Up @@ -8203,7 +8190,7 @@ static noinline int do_walk_down(struct btrfs_trans_handle *trans,
}
}
ret = btrfs_free_extent(trans, root, bytenr, blocksize, parent,
root->root_key.objectid, level - 1, 0, 0);
root->root_key.objectid, level - 1, 0);
BUG_ON(ret); /* -ENOMEM */
}
btrfs_tree_unlock(next);
Expand Down
10 changes: 5 additions & 5 deletions fs/btrfs/file.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -855,7 +855,7 @@ int __btrfs_drop_extents(struct btrfs_trans_handle *trans,
disk_bytenr, num_bytes, 0,
root->root_key.objectid,
new_key.objectid,
start - extent_offset, 1);
start - extent_offset);
BUG_ON(ret); /* -ENOMEM */
}
key.offset = start;
Expand Down Expand Up @@ -933,7 +933,7 @@ int __btrfs_drop_extents(struct btrfs_trans_handle *trans,
disk_bytenr, num_bytes, 0,
root->root_key.objectid,
key.objectid, key.offset -
extent_offset, 0);
extent_offset);
BUG_ON(ret); /* -ENOMEM */
inode_sub_bytes(inode,
extent_end - key.offset);
Expand Down Expand Up @@ -1212,7 +1212,7 @@ int btrfs_mark_extent_written(struct btrfs_trans_handle *trans,

ret = btrfs_inc_extent_ref(trans, root, bytenr, num_bytes, 0,
root->root_key.objectid,
ino, orig_offset, 1);
ino, orig_offset);
BUG_ON(ret); /* -ENOMEM */

if (split == start) {
Expand All @@ -1239,7 +1239,7 @@ int btrfs_mark_extent_written(struct btrfs_trans_handle *trans,
del_nr++;
ret = btrfs_free_extent(trans, root, bytenr, num_bytes,
0, root->root_key.objectid,
ino, orig_offset, 0);
ino, orig_offset);
BUG_ON(ret); /* -ENOMEM */
}
other_start = 0;
Expand All @@ -1256,7 +1256,7 @@ int btrfs_mark_extent_written(struct btrfs_trans_handle *trans,
del_nr++;
ret = btrfs_free_extent(trans, root, bytenr, num_bytes,
0, root->root_key.objectid,
ino, orig_offset, 0);
ino, orig_offset);
BUG_ON(ret); /* -ENOMEM */
}
if (del_nr == 0) {
Expand Down
4 changes: 2 additions & 2 deletions fs/btrfs/inode.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -2575,7 +2575,7 @@ static noinline int relink_extent_backref(struct btrfs_path *path,
ret = btrfs_inc_extent_ref(trans, root, new->bytenr,
new->disk_len, 0,
backref->root_id, backref->inum,
new->file_pos, 0); /* start - extent_offset */
new->file_pos); /* start - extent_offset */
if (ret) {
btrfs_abort_transaction(trans, root, ret);
goto out_free_path;
Expand Down Expand Up @@ -4488,7 +4488,7 @@ int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
ret = btrfs_free_extent(trans, root, extent_start,
extent_num_bytes, 0,
btrfs_header_owner(leaf),
ino, extent_offset, 0);
ino, extent_offset);
BUG_ON(ret);
if (btrfs_should_throttle_delayed_refs(trans, root))
btrfs_async_run_delayed_refs(root,
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