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btrfs: add helper for recording simple quota deltas

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Rather than re-computing shared/exclusive ownership based on backrefs
and walking roots for implicit backrefs, simple quotas does an increment
when creating an extent and a decrement when deleting it. Add the API
for the extent item code to use to track those events.

Signed-off-by: Boris Burkov <boris@bur.io>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Boris Burkov 2023-03-28 13:43:47 -07:00 committed by David Sterba
parent 6ed05643dd
commit 1e0e9d5771
2 changed files with 61 additions and 0 deletions
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46
fs/btrfs/qgroup.c
View File

@ -4586,3 +4586,49 @@ void btrfs_qgroup_destroy_extent_records(struct btrfs_transaction *trans)
}
*root = RB_ROOT;
}
int btrfs_record_squota_delta(struct btrfs_fs_info *fs_info,
struct btrfs_squota_delta *delta)
{
int ret;
struct btrfs_qgroup *qgroup;
struct btrfs_qgroup *qg;
LIST_HEAD(qgroup_list);
u64 root = delta->root;
u64 num_bytes = delta->num_bytes;
const int sign = (delta->is_inc ? 1 : -1);
if (btrfs_qgroup_mode(fs_info) != BTRFS_QGROUP_MODE_SIMPLE)
return 0;
if (!is_fstree(root))
return 0;
spin_lock(&fs_info->qgroup_lock);
qgroup = find_qgroup_rb(fs_info, root);
if (!qgroup) {
ret = -ENOENT;
goto out;
}
ret = 0;
qgroup_iterator_add(&qgroup_list, qgroup);
list_for_each_entry(qg, &qgroup_list, iterator) {
struct btrfs_qgroup_list *glist;
qg->excl += num_bytes * sign;
qg->rfer += num_bytes * sign;
qgroup_dirty(fs_info, qg);
list_for_each_entry(glist, &qg->groups, next_group)
qgroup_iterator_add(&qgroup_list, glist->group);
}
qgroup_iterator_clean(&qgroup_list);
out:
spin_unlock(&fs_info->qgroup_lock);
if (!ret && delta->rsv_bytes)
btrfs_qgroup_free_refroot(fs_info, root, delta->rsv_bytes,
BTRFS_QGROUP_RSV_DATA);
return ret;
}

15
fs/btrfs/qgroup.h
View File

@ -269,6 +269,19 @@ struct btrfs_qgroup {
struct kobject kobj;
};
struct btrfs_squota_delta {
/* The fstree root this delta counts against. */
u64 root;
/* The number of bytes in the extent being counted. */
u64 num_bytes;
/* The number of bytes reserved for this extent. */
u64 rsv_bytes;
/* Whether we are using or freeing the extent. */
bool is_inc;
/* Whether the extent is data or metadata. */
bool is_data;
};
static inline u64 btrfs_qgroup_subvolid(u64 qgroupid)
{
return (qgroupid & ((1ULL << BTRFS_QGROUP_LEVEL_SHIFT) - 1));
@ -407,5 +420,7 @@ int btrfs_qgroup_trace_subtree_after_cow(struct btrfs_trans_handle *trans,
struct btrfs_root *root, struct extent_buffer *eb);
void btrfs_qgroup_destroy_extent_records(struct btrfs_transaction *trans);
bool btrfs_check_quota_leak(struct btrfs_fs_info *fs_info);
int btrfs_record_squota_delta(struct btrfs_fs_info *fs_info,
struct btrfs_squota_delta *delta);
#endif