[mirror_ubuntu-artful-kernel.git] / fs / quota / kqid.c

#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);
Commit	Line	Data
e8a3e471 EB	1	#include <linux/fs.h>
	2	#include <linux/quota.h>
	3	#include <linux/export.h>
	4
	5	/**
	6	* qid_eq - Test to see if to kquid values are the same
	7	* @left: A qid value
	8	* @right: Another quid value
	9	*
	10	* Return true if the two qid values are equal and false otherwise.
	11	*/
	12	bool qid_eq(struct kqid left, struct kqid right)
	13	{
	14	if (left.type != right.type)
	15	return false;
	16	switch(left.type) {
	17	case USRQUOTA:
	18	return uid_eq(left.uid, right.uid);
	19	case GRPQUOTA:
	20	return gid_eq(left.gid, right.gid);
	21	case PRJQUOTA:
	22	return projid_eq(left.projid, right.projid);
	23	default:
	24	BUG();
	25	}
	26	}
	27	EXPORT_SYMBOL(qid_eq);
	28
	29	/**
	30	* qid_lt - Test to see if one qid value is less than another
	31	* @left: The possibly lesser qid value
	32	* @right: The possibly greater qid value
	33	*
	34	* Return true if left is less than right and false otherwise.
	35	*/
	36	bool qid_lt(struct kqid left, struct kqid right)
	37	{
	38	if (left.type < right.type)
	39	return true;
	40	if (left.type > right.type)
	41	return false;
	42	switch (left.type) {
	43	case USRQUOTA:
	44	return uid_lt(left.uid, right.uid);
	45	case GRPQUOTA:
	46	return gid_lt(left.gid, right.gid);
	47	case PRJQUOTA:
	48	return projid_lt(left.projid, right.projid);
	49	default:
	50	BUG();
	51	}
	52	}
	53	EXPORT_SYMBOL(qid_lt);
	54
	55	/**
	56	* from_kqid - Create a qid from a kqid user-namespace pair.
	57	* @targ: The user namespace we want a qid in.
2c15ac5b	58	* @kqid: The kernel internal quota identifier to start with.
e8a3e471 EB	59	*
	60	* Map @kqid into the user-namespace specified by @targ and
	61	* return the resulting qid.
	62	*
	63	* There is always a mapping into the initial user_namespace.
	64	*
	65	* If @kqid has no mapping in @targ (qid_t)-1 is returned.
	66	*/
	67	qid_t from_kqid(struct user_namespace *targ, struct kqid kqid)
	68	{
	69	switch (kqid.type) {
	70	case USRQUOTA:
	71	return from_kuid(targ, kqid.uid);
	72	case GRPQUOTA:
	73	return from_kgid(targ, kqid.gid);
	74	case PRJQUOTA:
	75	return from_kprojid(targ, kqid.projid);
	76	default:
	77	BUG();
	78	}
	79	}
	80	EXPORT_SYMBOL(from_kqid);
	81
	82	/**
	83	* from_kqid_munged - Create a qid from a kqid user-namespace pair.
	84	* @targ: The user namespace we want a qid in.
	85	* @kqid: The kernel internal quota identifier to start with.
	86	*
	87	* Map @kqid into the user-namespace specified by @targ and
	88	* return the resulting qid.
	89	*
	90	* There is always a mapping into the initial user_namespace.
	91	*
	92	* Unlike from_kqid from_kqid_munged never fails and always
	93	* returns a valid projid. This makes from_kqid_munged
	94	* appropriate for use in places where failing to provide
	95	* a qid_t is not a good option.
	96	*
	97	* If @kqid has no mapping in @targ the kqid.type specific
	98	* overflow identifier is returned.
	99	*/
	100	qid_t from_kqid_munged(struct user_namespace *targ, struct kqid kqid)
	101	{
	102	switch (kqid.type) {
	103	case USRQUOTA:
	104	return from_kuid_munged(targ, kqid.uid);
	105	case GRPQUOTA:
	106	return from_kgid_munged(targ, kqid.gid);
	107	case PRJQUOTA:
	108	return from_kprojid_munged(targ, kqid.projid);
	109	default:
	110	BUG();
	111	}
	112	}
	113	EXPORT_SYMBOL(from_kqid_munged);
	114
	115	/**
	116	* qid_valid - Report if a valid value is stored in a kqid.
	117	* @qid: The kernel internal quota identifier to test.
	118	*/
	119	bool qid_valid(struct kqid qid)
	120	{
	121	switch (qid.type) {
	122	case USRQUOTA:
123	return uid_valid(qid.uid);
124	case GRPQUOTA:
125	return gid_valid(qid.gid);
126	case PRJQUOTA:
127	return projid_valid(qid.projid);
128	default:
129	BUG();
130	}
131	}
132	EXPORT_SYMBOL(qid_valid);