diff options
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/quota.h | 125 |
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) |