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-rw-r--r--include/linux/quota.h125
1 files changed, 125 insertions, 0 deletions
diff --git a/include/linux/quota.h b/include/linux/quota.h
index 524ede8a160a..00ac8d846c14 100644
--- a/include/linux/quota.h
+++ b/include/linux/quota.h
@@ -181,10 +181,135 @@ enum {
#include <linux/dqblk_v2.h>
#include <linux/atomic.h>
+#include <linux/uidgid.h>
+#include <linux/projid.h>
+
+#undef USRQUOTA
+#undef GRPQUOTA
+enum quota_type {
+ USRQUOTA = 0, /* element used for user quotas */
+ GRPQUOTA = 1, /* element used for group quotas */
+ PRJQUOTA = 2, /* element used for project quotas */
+};
typedef __kernel_uid32_t qid_t; /* Type in which we store ids in memory */
typedef long long qsize_t; /* Type in which we store sizes */
+struct kqid { /* Type in which we store the quota identifier */
+ union {
+ kuid_t uid;
+ kgid_t gid;
+ kprojid_t projid;
+ };
+ enum quota_type type; /* USRQUOTA (uid) or GRPQUOTA (gid) or PRJQUOTA (projid) */
+};
+
+extern bool qid_eq(struct kqid left, struct kqid right);
+extern bool qid_lt(struct kqid left, struct kqid right);
+extern qid_t from_kqid(struct user_namespace *to, struct kqid qid);
+extern qid_t from_kqid_munged(struct user_namespace *to, struct kqid qid);
+extern bool qid_valid(struct kqid qid);
+
+/**
+ * make_kqid - Map a user-namespace, type, qid tuple into a kqid.
+ * @from: User namespace that the qid is in
+ * @type: The type of quota
+ * @qid: Quota identifier
+ *
+ * Maps a user-namespace, type qid tuple into a kernel internal
+ * kqid, and returns that kqid.
+ *
+ * When there is no mapping defined for the user-namespace, type,
+ * qid tuple an invalid kqid is returned. Callers are expected to
+ * test for and handle handle invalid kqids being returned.
+ * Invalid kqids may be tested for using qid_valid().
+ */
+static inline struct kqid make_kqid(struct user_namespace *from,
+ enum quota_type type, qid_t qid)
+{
+ struct kqid kqid;
+
+ kqid.type = type;
+ switch (type) {
+ case USRQUOTA:
+ kqid.uid = make_kuid(from, qid);
+ break;
+ case GRPQUOTA:
+ kqid.gid = make_kgid(from, qid);
+ break;
+ case PRJQUOTA:
+ kqid.projid = make_kprojid(from, qid);
+ break;
+ default:
+ BUG();
+ }
+ return kqid;
+}
+
+/**
+ * make_kqid_invalid - Explicitly make an invalid kqid
+ * @type: The type of quota identifier
+ *
+ * Returns an invalid kqid with the specified type.
+ */
+static inline struct kqid make_kqid_invalid(enum quota_type type)
+{
+ struct kqid kqid;
+
+ kqid.type = type;
+ switch (type) {
+ case USRQUOTA:
+ kqid.uid = INVALID_UID;
+ break;
+ case GRPQUOTA:
+ kqid.gid = INVALID_GID;
+ break;
+ case PRJQUOTA:
+ kqid.projid = INVALID_PROJID;
+ break;
+ default:
+ BUG();
+ }
+ return kqid;
+}
+
+/**
+ * make_kqid_uid - Make a kqid from a kuid
+ * @uid: The kuid to make the quota identifier from
+ */
+static inline struct kqid make_kqid_uid(kuid_t uid)
+{
+ struct kqid kqid;
+ kqid.type = USRQUOTA;
+ kqid.uid = uid;
+ return kqid;
+}
+
+/**
+ * make_kqid_gid - Make a kqid from a kgid
+ * @gid: The kgid to make the quota identifier from
+ */
+static inline struct kqid make_kqid_gid(kgid_t gid)
+{
+ struct kqid kqid;
+ kqid.type = GRPQUOTA;
+ kqid.gid = gid;
+ return kqid;
+}
+
+/**
+ * make_kqid_projid - Make a kqid from a projid
+ * @projid: The kprojid to make the quota identifier from
+ */
+static inline struct kqid make_kqid_projid(kprojid_t projid)
+{
+ struct kqid kqid;
+ kqid.type = PRJQUOTA;
+ kqid.projid = projid;
+ return kqid;
+}
+
+
extern spinlock_t dq_data_lock;
/* Maximal numbers of writes for quota operation (insert/delete/update)