134 lines
3.2 KiB
C
134 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/fs.h>
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#include <linux/quota.h>
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#include <linux/export.h>
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/**
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* qid_eq - Test to see if to kquid values are the same
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* @left: A qid value
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* @right: Another quid value
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*
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* Return true if the two qid values are equal and false otherwise.
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*/
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bool qid_eq(struct kqid left, struct kqid right)
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{
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if (left.type != right.type)
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return false;
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switch(left.type) {
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case USRQUOTA:
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return uid_eq(left.uid, right.uid);
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case GRPQUOTA:
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return gid_eq(left.gid, right.gid);
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case PRJQUOTA:
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return projid_eq(left.projid, right.projid);
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default:
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BUG();
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}
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}
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EXPORT_SYMBOL(qid_eq);
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/**
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* qid_lt - Test to see if one qid value is less than another
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* @left: The possibly lesser qid value
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* @right: The possibly greater qid value
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*
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* Return true if left is less than right and false otherwise.
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*/
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bool qid_lt(struct kqid left, struct kqid right)
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{
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if (left.type < right.type)
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return true;
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if (left.type > right.type)
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return false;
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switch (left.type) {
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case USRQUOTA:
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return uid_lt(left.uid, right.uid);
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case GRPQUOTA:
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return gid_lt(left.gid, right.gid);
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case PRJQUOTA:
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return projid_lt(left.projid, right.projid);
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default:
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BUG();
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}
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}
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EXPORT_SYMBOL(qid_lt);
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/**
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* from_kqid - Create a qid from a kqid user-namespace pair.
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* @targ: The user namespace we want a qid in.
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* @kqid: The kernel internal quota identifier to start with.
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*
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* Map @kqid into the user-namespace specified by @targ and
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* return the resulting qid.
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*
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* There is always a mapping into the initial user_namespace.
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*
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* If @kqid has no mapping in @targ (qid_t)-1 is returned.
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*/
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qid_t from_kqid(struct user_namespace *targ, struct kqid kqid)
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{
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switch (kqid.type) {
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case USRQUOTA:
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return from_kuid(targ, kqid.uid);
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case GRPQUOTA:
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return from_kgid(targ, kqid.gid);
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case PRJQUOTA:
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return from_kprojid(targ, kqid.projid);
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default:
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BUG();
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}
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}
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EXPORT_SYMBOL(from_kqid);
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/**
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* from_kqid_munged - Create a qid from a kqid user-namespace pair.
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* @targ: The user namespace we want a qid in.
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* @kqid: The kernel internal quota identifier to start with.
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*
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* Map @kqid into the user-namespace specified by @targ and
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* return the resulting qid.
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*
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* There is always a mapping into the initial user_namespace.
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*
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* Unlike from_kqid from_kqid_munged never fails and always
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* returns a valid projid. This makes from_kqid_munged
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* appropriate for use in places where failing to provide
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* a qid_t is not a good option.
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*
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* If @kqid has no mapping in @targ the kqid.type specific
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* overflow identifier is returned.
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*/
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qid_t from_kqid_munged(struct user_namespace *targ, struct kqid kqid)
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{
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switch (kqid.type) {
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case USRQUOTA:
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return from_kuid_munged(targ, kqid.uid);
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case GRPQUOTA:
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return from_kgid_munged(targ, kqid.gid);
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case PRJQUOTA:
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return from_kprojid_munged(targ, kqid.projid);
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default:
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BUG();
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}
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}
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EXPORT_SYMBOL(from_kqid_munged);
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/**
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* qid_valid - Report if a valid value is stored in a kqid.
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* @qid: The kernel internal quota identifier to test.
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*/
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bool qid_valid(struct kqid qid)
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{
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switch (qid.type) {
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case USRQUOTA:
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return uid_valid(qid.uid);
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case GRPQUOTA:
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return gid_valid(qid.gid);
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case PRJQUOTA:
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return projid_valid(qid.projid);
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default:
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BUG();
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}
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}
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EXPORT_SYMBOL(qid_valid);
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