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btrfs: qgroup: Introduce helpers to update and access new qgroup rsv 

Introduce helpers to:

1) Get total reserved space
   For limit calculation
2) Add/release reserved space for given type
   With underflow detection and warning
3) Add/release reserved space according to child qgroup

Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo 2017-12-12 15:34:24 +08:00 committed by David Sterba
parent d4e5c92055
commit f59c0347d4
1 changed files with 68 additions and 0 deletions
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68
fs/btrfs/qgroup.c
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@ -47,6 +47,74 @@
* - check all ioctl parameters * - check all ioctl parameters
*/ */
/*
* Helpers to access qgroup reservation
*
* Callers should ensure the lock context and type are valid
*/
static u64 qgroup_rsv_total(const struct btrfs_qgroup *qgroup)
{
u64 ret = 0;
int i;
for (i = 0; i < BTRFS_QGROUP_RSV_LAST; i++)
ret += qgroup->rsv.values[i];
return ret;
}
#ifdef CONFIG_BTRFS_DEBUG
static const char *qgroup_rsv_type_str(enum btrfs_qgroup_rsv_type type)
{
if (type == BTRFS_QGROUP_RSV_DATA)
return "data";
if (type == BTRFS_QGROUP_RSV_META)
return "meta";
return NULL;
}
#endif
static void qgroup_rsv_add(struct btrfs_qgroup *qgroup, u64 num_bytes,
enum btrfs_qgroup_rsv_type type)
{
qgroup->rsv.values[type] += num_bytes;
}
static void qgroup_rsv_release(struct btrfs_qgroup *qgroup, u64 num_bytes,
enum btrfs_qgroup_rsv_type type)
{
if (qgroup->rsv.values[type] >= num_bytes) {
qgroup->rsv.values[type] -= num_bytes;
return;
}
#ifdef CONFIG_BTRFS_DEBUG
WARN_RATELIMIT(1,
"qgroup %llu %s reserved space underflow, have %llu to free %llu",
qgroup->qgroupid, qgroup_rsv_type_str(type),
qgroup->rsv.values[type], num_bytes);
#endif
qgroup->rsv.values[type] = 0;
}
static void qgroup_rsv_add_by_qgroup(struct btrfs_qgroup *dest,
struct btrfs_qgroup *src)
{
int i;
for (i = 0; i < BTRFS_QGROUP_RSV_LAST; i++)
qgroup_rsv_add(dest, src->rsv.values[i], i);
}
static void qgroup_rsv_release_by_qgroup(struct btrfs_qgroup *dest,
struct btrfs_qgroup *src)
{
int i;
for (i = 0; i < BTRFS_QGROUP_RSV_LAST; i++)
qgroup_rsv_release(dest, src->rsv.values[i], i);
}
static void btrfs_qgroup_update_old_refcnt(struct btrfs_qgroup *qg, u64 seq, static void btrfs_qgroup_update_old_refcnt(struct btrfs_qgroup *qg, u64 seq,
int mod) int mod)
{ {