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