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btrfs: qgroup: Add the ability to skip given qgroup for old/new_roots.

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This is used by later qgroup fix patches for snapshot.

As current snapshot accounting is done by btrfs_qgroup_inherit(), but
new extent oriented quota mechanism will account extent from
btrfs_copy_root() and other snapshot things, causing wrong result.

So add this ability to handle snapshot accounting.

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
Qu Wenruo 2015-04-20 09:53:50 +08:00 committed by Chris Mason
parent d4b8040459
commit 9086db86e0
4 changed files with 40 additions and 0 deletions
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8
fs/btrfs/delayed-ref.h
View File

@ -175,6 +175,14 @@ struct btrfs_delayed_ref_root {
int flushing;
u64 run_delayed_start;
/*
* To make qgroup to skip given root.
* This is for snapshot, as btrfs_qgroup_inherit() will manully
* modify counters for snapshot and its source, so we should skip
* the snapshot in new_root/old_roots or it will get calculated twice
*/
u64 qgroup_to_skip;
};
extern struct kmem_cache *btrfs_delayed_ref_head_cachep;

8
fs/btrfs/qgroup.c
View File

@ -1394,9 +1394,11 @@ int btrfs_qgroup_prepare_account_extents(struct btrfs_trans_handle *trans,
struct btrfs_qgroup_extent_record *record;
struct btrfs_delayed_ref_root *delayed_refs;
struct rb_node *node;
u64 qgroup_to_skip;
int ret = 0;
delayed_refs = &trans->transaction->delayed_refs;
qgroup_to_skip = delayed_refs->qgroup_to_skip;
/*
* No need to do lock, since this function will only be called in
@ -1410,6 +1412,8 @@ int btrfs_qgroup_prepare_account_extents(struct btrfs_trans_handle *trans,
&record->old_roots);
if (ret < 0)
break;
if (qgroup_to_skip)
ulist_del(record->old_roots, qgroup_to_skip, 0);
node = rb_next(node);
}
return ret;
@ -1702,9 +1706,11 @@ int btrfs_qgroup_account_extents(struct btrfs_trans_handle *trans,
struct btrfs_delayed_ref_root *delayed_refs;
struct ulist *new_roots = NULL;
struct rb_node *node;
u64 qgroup_to_skip;
int ret = 0;
delayed_refs = &trans->transaction->delayed_refs;
qgroup_to_skip = delayed_refs->qgroup_to_skip;
while ((node = rb_first(&delayed_refs->dirty_extent_root))) {
record = rb_entry(node, struct btrfs_qgroup_extent_record,
node);
@ -1719,6 +1725,8 @@ int btrfs_qgroup_account_extents(struct btrfs_trans_handle *trans,
record->bytenr, (u64)-1, &new_roots);
if (ret < 0)
goto cleanup;
if (qgroup_to_skip)
ulist_del(new_roots, qgroup_to_skip, 0);
ret = btrfs_qgroup_account_extent(trans, fs_info,
record->bytenr, record->num_bytes,
record->old_roots, new_roots);

1
fs/btrfs/transaction.c
View File

@ -232,6 +232,7 @@ static noinline int join_transaction(struct btrfs_root *root, unsigned int type)
cur_trans->delayed_refs.num_heads = 0;
cur_trans->delayed_refs.flushing = 0;
cur_trans->delayed_refs.run_delayed_start = 0;
cur_trans->delayed_refs.qgroup_to_skip = 0;
/*
* although the tree mod log is per file system and not per transaction,

23
fs/btrfs/transaction.h
View File

@ -154,6 +154,29 @@ static inline void btrfs_set_inode_last_trans(struct btrfs_trans_handle *trans,
spin_unlock(&BTRFS_I(inode)->lock);
}
/*
* Make qgroup codes to skip given qgroupid, means the old/new_roots for
* qgroup won't contain the qgroupid in it.
*/
static inline void btrfs_set_skip_qgroup(struct btrfs_trans_handle *trans,
u64 qgroupid)
{
struct btrfs_delayed_ref_root *delayed_refs;
delayed_refs = &trans->transaction->delayed_refs;
WARN_ON(delayed_refs->qgroup_to_skip);
delayed_refs->qgroup_to_skip = qgroupid;
}
static inline void btrfs_clear_skip_qgroup(struct btrfs_trans_handle *trans)
{
struct btrfs_delayed_ref_root *delayed_refs;
delayed_refs = &trans->transaction->delayed_refs;
WARN_ON(!delayed_refs->qgroup_to_skip);
delayed_refs->qgroup_to_skip = 0;
}
int btrfs_end_transaction(struct btrfs_trans_handle *trans,
struct btrfs_root *root);
struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root,