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