Commit fe759907 authored by Yang Dongsheng's avatar Yang Dongsheng Committed by Chris Mason

btrfs: qgroup: allow user to clear the limitation on qgroup

Currently, we can only set a limitation on a qgroup, but we
can not clear it.

This patch provide a choice to user to clear a limitation on
qgroup by passing a value of CLEAR_VALUE(-1) to kernel.
Reported-by: default avatarTsutomu Itoh <t-itoh@jp.fujitsu.com>
Signed-off-by: default avatarDongsheng Yang <yangds.fnst@cn.fujitsu.com>
Tested-by: default avatarTsutomu Itoh <t-itoh@jp.fujitsu.com>
Signed-off-by: default avatarChris Mason <clm@fb.com>
parent 5a5003df
......@@ -1349,6 +1349,11 @@ int btrfs_limit_qgroup(struct btrfs_trans_handle *trans,
struct btrfs_root *quota_root;
struct btrfs_qgroup *qgroup;
int ret = 0;
/* Sometimes we would want to clear the limit on this qgroup.
* To meet this requirement, we treat the -1 as a special value
* which tell kernel to clear the limit on this qgroup.
*/
const u64 CLEAR_VALUE = -1;
mutex_lock(&fs_info->qgroup_ioctl_lock);
quota_root = fs_info->quota_root;
......@@ -1364,14 +1369,42 @@ int btrfs_limit_qgroup(struct btrfs_trans_handle *trans,
}
spin_lock(&fs_info->qgroup_lock);
if (limit->flags & BTRFS_QGROUP_LIMIT_MAX_RFER)
if (limit->flags & BTRFS_QGROUP_LIMIT_MAX_RFER) {
if (limit->max_rfer == CLEAR_VALUE) {
qgroup->lim_flags &= ~BTRFS_QGROUP_LIMIT_MAX_RFER;
limit->flags &= ~BTRFS_QGROUP_LIMIT_MAX_RFER;
qgroup->max_rfer = 0;
} else {
qgroup->max_rfer = limit->max_rfer;
if (limit->flags & BTRFS_QGROUP_LIMIT_MAX_EXCL)
}
}
if (limit->flags & BTRFS_QGROUP_LIMIT_MAX_EXCL) {
if (limit->max_excl == CLEAR_VALUE) {
qgroup->lim_flags &= ~BTRFS_QGROUP_LIMIT_MAX_EXCL;
limit->flags &= ~BTRFS_QGROUP_LIMIT_MAX_EXCL;
qgroup->max_excl = 0;
} else {
qgroup->max_excl = limit->max_excl;
if (limit->flags & BTRFS_QGROUP_LIMIT_RSV_RFER)
}
}
if (limit->flags & BTRFS_QGROUP_LIMIT_RSV_RFER) {
if (limit->rsv_rfer == CLEAR_VALUE) {
qgroup->lim_flags &= ~BTRFS_QGROUP_LIMIT_RSV_RFER;
limit->flags &= ~BTRFS_QGROUP_LIMIT_RSV_RFER;
qgroup->rsv_rfer = 0;
} else {
qgroup->rsv_rfer = limit->rsv_rfer;
if (limit->flags & BTRFS_QGROUP_LIMIT_RSV_EXCL)
}
}
if (limit->flags & BTRFS_QGROUP_LIMIT_RSV_EXCL) {
if (limit->rsv_excl == CLEAR_VALUE) {
qgroup->lim_flags &= ~BTRFS_QGROUP_LIMIT_RSV_EXCL;
limit->flags &= ~BTRFS_QGROUP_LIMIT_RSV_EXCL;
qgroup->rsv_excl = 0;
} else {
qgroup->rsv_excl = limit->rsv_excl;
}
}
qgroup->lim_flags |= limit->flags;
spin_unlock(&fs_info->qgroup_lock);
......
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