1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun #include <linux/fs.h>
3*4882a593Smuzhiyun #include <linux/quota.h>
4*4882a593Smuzhiyun #include <linux/export.h>
5*4882a593Smuzhiyun
6*4882a593Smuzhiyun /**
7*4882a593Smuzhiyun * qid_eq - Test to see if to kquid values are the same
8*4882a593Smuzhiyun * @left: A qid value
9*4882a593Smuzhiyun * @right: Another quid value
10*4882a593Smuzhiyun *
11*4882a593Smuzhiyun * Return true if the two qid values are equal and false otherwise.
12*4882a593Smuzhiyun */
qid_eq(struct kqid left,struct kqid right)13*4882a593Smuzhiyun bool qid_eq(struct kqid left, struct kqid right)
14*4882a593Smuzhiyun {
15*4882a593Smuzhiyun if (left.type != right.type)
16*4882a593Smuzhiyun return false;
17*4882a593Smuzhiyun switch(left.type) {
18*4882a593Smuzhiyun case USRQUOTA:
19*4882a593Smuzhiyun return uid_eq(left.uid, right.uid);
20*4882a593Smuzhiyun case GRPQUOTA:
21*4882a593Smuzhiyun return gid_eq(left.gid, right.gid);
22*4882a593Smuzhiyun case PRJQUOTA:
23*4882a593Smuzhiyun return projid_eq(left.projid, right.projid);
24*4882a593Smuzhiyun default:
25*4882a593Smuzhiyun BUG();
26*4882a593Smuzhiyun }
27*4882a593Smuzhiyun }
28*4882a593Smuzhiyun EXPORT_SYMBOL(qid_eq);
29*4882a593Smuzhiyun
30*4882a593Smuzhiyun /**
31*4882a593Smuzhiyun * qid_lt - Test to see if one qid value is less than another
32*4882a593Smuzhiyun * @left: The possibly lesser qid value
33*4882a593Smuzhiyun * @right: The possibly greater qid value
34*4882a593Smuzhiyun *
35*4882a593Smuzhiyun * Return true if left is less than right and false otherwise.
36*4882a593Smuzhiyun */
qid_lt(struct kqid left,struct kqid right)37*4882a593Smuzhiyun bool qid_lt(struct kqid left, struct kqid right)
38*4882a593Smuzhiyun {
39*4882a593Smuzhiyun if (left.type < right.type)
40*4882a593Smuzhiyun return true;
41*4882a593Smuzhiyun if (left.type > right.type)
42*4882a593Smuzhiyun return false;
43*4882a593Smuzhiyun switch (left.type) {
44*4882a593Smuzhiyun case USRQUOTA:
45*4882a593Smuzhiyun return uid_lt(left.uid, right.uid);
46*4882a593Smuzhiyun case GRPQUOTA:
47*4882a593Smuzhiyun return gid_lt(left.gid, right.gid);
48*4882a593Smuzhiyun case PRJQUOTA:
49*4882a593Smuzhiyun return projid_lt(left.projid, right.projid);
50*4882a593Smuzhiyun default:
51*4882a593Smuzhiyun BUG();
52*4882a593Smuzhiyun }
53*4882a593Smuzhiyun }
54*4882a593Smuzhiyun EXPORT_SYMBOL(qid_lt);
55*4882a593Smuzhiyun
56*4882a593Smuzhiyun /**
57*4882a593Smuzhiyun * from_kqid - Create a qid from a kqid user-namespace pair.
58*4882a593Smuzhiyun * @targ: The user namespace we want a qid in.
59*4882a593Smuzhiyun * @kqid: The kernel internal quota identifier to start with.
60*4882a593Smuzhiyun *
61*4882a593Smuzhiyun * Map @kqid into the user-namespace specified by @targ and
62*4882a593Smuzhiyun * return the resulting qid.
63*4882a593Smuzhiyun *
64*4882a593Smuzhiyun * There is always a mapping into the initial user_namespace.
65*4882a593Smuzhiyun *
66*4882a593Smuzhiyun * If @kqid has no mapping in @targ (qid_t)-1 is returned.
67*4882a593Smuzhiyun */
from_kqid(struct user_namespace * targ,struct kqid kqid)68*4882a593Smuzhiyun qid_t from_kqid(struct user_namespace *targ, struct kqid kqid)
69*4882a593Smuzhiyun {
70*4882a593Smuzhiyun switch (kqid.type) {
71*4882a593Smuzhiyun case USRQUOTA:
72*4882a593Smuzhiyun return from_kuid(targ, kqid.uid);
73*4882a593Smuzhiyun case GRPQUOTA:
74*4882a593Smuzhiyun return from_kgid(targ, kqid.gid);
75*4882a593Smuzhiyun case PRJQUOTA:
76*4882a593Smuzhiyun return from_kprojid(targ, kqid.projid);
77*4882a593Smuzhiyun default:
78*4882a593Smuzhiyun BUG();
79*4882a593Smuzhiyun }
80*4882a593Smuzhiyun }
81*4882a593Smuzhiyun EXPORT_SYMBOL(from_kqid);
82*4882a593Smuzhiyun
83*4882a593Smuzhiyun /**
84*4882a593Smuzhiyun * from_kqid_munged - Create a qid from a kqid user-namespace pair.
85*4882a593Smuzhiyun * @targ: The user namespace we want a qid in.
86*4882a593Smuzhiyun * @kqid: The kernel internal quota identifier to start with.
87*4882a593Smuzhiyun *
88*4882a593Smuzhiyun * Map @kqid into the user-namespace specified by @targ and
89*4882a593Smuzhiyun * return the resulting qid.
90*4882a593Smuzhiyun *
91*4882a593Smuzhiyun * There is always a mapping into the initial user_namespace.
92*4882a593Smuzhiyun *
93*4882a593Smuzhiyun * Unlike from_kqid from_kqid_munged never fails and always
94*4882a593Smuzhiyun * returns a valid projid. This makes from_kqid_munged
95*4882a593Smuzhiyun * appropriate for use in places where failing to provide
96*4882a593Smuzhiyun * a qid_t is not a good option.
97*4882a593Smuzhiyun *
98*4882a593Smuzhiyun * If @kqid has no mapping in @targ the kqid.type specific
99*4882a593Smuzhiyun * overflow identifier is returned.
100*4882a593Smuzhiyun */
from_kqid_munged(struct user_namespace * targ,struct kqid kqid)101*4882a593Smuzhiyun qid_t from_kqid_munged(struct user_namespace *targ, struct kqid kqid)
102*4882a593Smuzhiyun {
103*4882a593Smuzhiyun switch (kqid.type) {
104*4882a593Smuzhiyun case USRQUOTA:
105*4882a593Smuzhiyun return from_kuid_munged(targ, kqid.uid);
106*4882a593Smuzhiyun case GRPQUOTA:
107*4882a593Smuzhiyun return from_kgid_munged(targ, kqid.gid);
108*4882a593Smuzhiyun case PRJQUOTA:
109*4882a593Smuzhiyun return from_kprojid_munged(targ, kqid.projid);
110*4882a593Smuzhiyun default:
111*4882a593Smuzhiyun BUG();
112*4882a593Smuzhiyun }
113*4882a593Smuzhiyun }
114*4882a593Smuzhiyun EXPORT_SYMBOL(from_kqid_munged);
115*4882a593Smuzhiyun
116*4882a593Smuzhiyun /**
117*4882a593Smuzhiyun * qid_valid - Report if a valid value is stored in a kqid.
118*4882a593Smuzhiyun * @qid: The kernel internal quota identifier to test.
119*4882a593Smuzhiyun */
qid_valid(struct kqid qid)120*4882a593Smuzhiyun bool qid_valid(struct kqid qid)
121*4882a593Smuzhiyun {
122*4882a593Smuzhiyun switch (qid.type) {
123*4882a593Smuzhiyun case USRQUOTA:
124*4882a593Smuzhiyun return uid_valid(qid.uid);
125*4882a593Smuzhiyun case GRPQUOTA:
126*4882a593Smuzhiyun return gid_valid(qid.gid);
127*4882a593Smuzhiyun case PRJQUOTA:
128*4882a593Smuzhiyun return projid_valid(qid.projid);
129*4882a593Smuzhiyun default:
130*4882a593Smuzhiyun BUG();
131*4882a593Smuzhiyun }
132*4882a593Smuzhiyun }
133*4882a593Smuzhiyun EXPORT_SYMBOL(qid_valid);
134