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541 lines
19 KiB
541 lines
19 KiB
/* |
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* Copyright (c) 1982, 1986 Regents of the University of California. |
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* All rights reserved. |
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* |
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* This code is derived from software contributed to Berkeley by |
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* Robert Elz at The University of Melbourne. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. Neither the name of the University nor the names of its contributors |
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* may be used to endorse or promote products derived from this software |
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* without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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*/ |
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#ifndef _LINUX_QUOTA_ |
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#define _LINUX_QUOTA_ |
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|
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#include <linux/list.h> |
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#include <linux/mutex.h> |
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#include <linux/rwsem.h> |
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#include <linux/spinlock.h> |
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#include <linux/wait.h> |
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#include <linux/percpu_counter.h> |
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|
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#include <linux/dqblk_xfs.h> |
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#include <linux/dqblk_v1.h> |
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#include <linux/dqblk_v2.h> |
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|
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#include <linux/atomic.h> |
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#include <linux/uidgid.h> |
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#include <linux/projid.h> |
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#include <uapi/linux/quota.h> |
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|
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#undef USRQUOTA |
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#undef GRPQUOTA |
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#undef PRJQUOTA |
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enum quota_type { |
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USRQUOTA = 0, /* element used for user quotas */ |
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GRPQUOTA = 1, /* element used for group quotas */ |
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PRJQUOTA = 2, /* element used for project quotas */ |
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}; |
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|
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/* Masks for quota types when used as a bitmask */ |
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#define QTYPE_MASK_USR (1 << USRQUOTA) |
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#define QTYPE_MASK_GRP (1 << GRPQUOTA) |
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#define QTYPE_MASK_PRJ (1 << PRJQUOTA) |
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|
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typedef __kernel_uid32_t qid_t; /* Type in which we store ids in memory */ |
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typedef long long qsize_t; /* Type in which we store sizes */ |
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|
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struct kqid { /* Type in which we store the quota identifier */ |
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union { |
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kuid_t uid; |
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kgid_t gid; |
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kprojid_t projid; |
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}; |
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enum quota_type type; /* USRQUOTA (uid) or GRPQUOTA (gid) or PRJQUOTA (projid) */ |
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}; |
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|
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extern bool qid_eq(struct kqid left, struct kqid right); |
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extern bool qid_lt(struct kqid left, struct kqid right); |
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extern qid_t from_kqid(struct user_namespace *to, struct kqid qid); |
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extern qid_t from_kqid_munged(struct user_namespace *to, struct kqid qid); |
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extern bool qid_valid(struct kqid qid); |
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|
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/** |
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* make_kqid - Map a user-namespace, type, qid tuple into a kqid. |
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* @from: User namespace that the qid is in |
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* @type: The type of quota |
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* @qid: Quota identifier |
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* |
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* Maps a user-namespace, type qid tuple into a kernel internal |
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* kqid, and returns that kqid. |
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* |
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* When there is no mapping defined for the user-namespace, type, |
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* qid tuple an invalid kqid is returned. Callers are expected to |
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* test for and handle handle invalid kqids being returned. |
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* Invalid kqids may be tested for using qid_valid(). |
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*/ |
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static inline struct kqid make_kqid(struct user_namespace *from, |
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enum quota_type type, qid_t qid) |
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{ |
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struct kqid kqid; |
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|
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kqid.type = type; |
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switch (type) { |
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case USRQUOTA: |
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kqid.uid = make_kuid(from, qid); |
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break; |
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case GRPQUOTA: |
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kqid.gid = make_kgid(from, qid); |
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break; |
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case PRJQUOTA: |
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kqid.projid = make_kprojid(from, qid); |
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break; |
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default: |
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BUG(); |
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} |
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return kqid; |
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} |
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|
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/** |
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* make_kqid_invalid - Explicitly make an invalid kqid |
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* @type: The type of quota identifier |
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* |
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* Returns an invalid kqid with the specified type. |
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*/ |
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static inline struct kqid make_kqid_invalid(enum quota_type type) |
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{ |
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struct kqid kqid; |
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|
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kqid.type = type; |
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switch (type) { |
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case USRQUOTA: |
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kqid.uid = INVALID_UID; |
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break; |
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case GRPQUOTA: |
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kqid.gid = INVALID_GID; |
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break; |
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case PRJQUOTA: |
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kqid.projid = INVALID_PROJID; |
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break; |
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default: |
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BUG(); |
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} |
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return kqid; |
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} |
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|
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/** |
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* make_kqid_uid - Make a kqid from a kuid |
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* @uid: The kuid to make the quota identifier from |
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*/ |
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static inline struct kqid make_kqid_uid(kuid_t uid) |
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{ |
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struct kqid kqid; |
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kqid.type = USRQUOTA; |
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kqid.uid = uid; |
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return kqid; |
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} |
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|
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/** |
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* make_kqid_gid - Make a kqid from a kgid |
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* @gid: The kgid to make the quota identifier from |
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*/ |
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static inline struct kqid make_kqid_gid(kgid_t gid) |
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{ |
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struct kqid kqid; |
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kqid.type = GRPQUOTA; |
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kqid.gid = gid; |
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return kqid; |
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} |
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|
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/** |
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* make_kqid_projid - Make a kqid from a projid |
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* @projid: The kprojid to make the quota identifier from |
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*/ |
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static inline struct kqid make_kqid_projid(kprojid_t projid) |
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{ |
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struct kqid kqid; |
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kqid.type = PRJQUOTA; |
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kqid.projid = projid; |
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return kqid; |
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} |
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|
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/** |
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* qid_has_mapping - Report if a qid maps into a user namespace. |
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* @ns: The user namespace to see if a value maps into. |
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* @qid: The kernel internal quota identifier to test. |
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*/ |
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static inline bool qid_has_mapping(struct user_namespace *ns, struct kqid qid) |
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{ |
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return from_kqid(ns, qid) != (qid_t) -1; |
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} |
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extern spinlock_t dq_data_lock; |
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|
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/* Maximal numbers of writes for quota operation (insert/delete/update) |
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* (over VFS all formats) */ |
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#define DQUOT_INIT_ALLOC max(V1_INIT_ALLOC, V2_INIT_ALLOC) |
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#define DQUOT_INIT_REWRITE max(V1_INIT_REWRITE, V2_INIT_REWRITE) |
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#define DQUOT_DEL_ALLOC max(V1_DEL_ALLOC, V2_DEL_ALLOC) |
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#define DQUOT_DEL_REWRITE max(V1_DEL_REWRITE, V2_DEL_REWRITE) |
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|
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/* |
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* Data for one user/group kept in memory |
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*/ |
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struct mem_dqblk { |
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qsize_t dqb_bhardlimit; /* absolute limit on disk blks alloc */ |
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qsize_t dqb_bsoftlimit; /* preferred limit on disk blks */ |
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qsize_t dqb_curspace; /* current used space */ |
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qsize_t dqb_rsvspace; /* current reserved space for delalloc*/ |
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qsize_t dqb_ihardlimit; /* absolute limit on allocated inodes */ |
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qsize_t dqb_isoftlimit; /* preferred inode limit */ |
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qsize_t dqb_curinodes; /* current # allocated inodes */ |
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time64_t dqb_btime; /* time limit for excessive disk use */ |
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time64_t dqb_itime; /* time limit for excessive inode use */ |
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}; |
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|
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/* |
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* Data for one quotafile kept in memory |
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*/ |
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struct quota_format_type; |
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|
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struct mem_dqinfo { |
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struct quota_format_type *dqi_format; |
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int dqi_fmt_id; /* Id of the dqi_format - used when turning |
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* quotas on after remount RW */ |
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struct list_head dqi_dirty_list; /* List of dirty dquots [dq_list_lock] */ |
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unsigned long dqi_flags; /* DFQ_ flags [dq_data_lock] */ |
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unsigned int dqi_bgrace; /* Space grace time [dq_data_lock] */ |
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unsigned int dqi_igrace; /* Inode grace time [dq_data_lock] */ |
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qsize_t dqi_max_spc_limit; /* Maximum space limit [static] */ |
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qsize_t dqi_max_ino_limit; /* Maximum inode limit [static] */ |
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void *dqi_priv; |
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}; |
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struct super_block; |
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|
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/* Mask for flags passed to userspace */ |
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#define DQF_GETINFO_MASK (DQF_ROOT_SQUASH | DQF_SYS_FILE) |
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/* Mask for flags modifiable from userspace */ |
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#define DQF_SETINFO_MASK DQF_ROOT_SQUASH |
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enum { |
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DQF_INFO_DIRTY_B = DQF_PRIVATE, |
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}; |
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#define DQF_INFO_DIRTY (1 << DQF_INFO_DIRTY_B) /* Is info dirty? */ |
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extern void mark_info_dirty(struct super_block *sb, int type); |
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static inline int info_dirty(struct mem_dqinfo *info) |
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{ |
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return test_bit(DQF_INFO_DIRTY_B, &info->dqi_flags); |
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} |
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enum { |
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DQST_LOOKUPS, |
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DQST_DROPS, |
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DQST_READS, |
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DQST_WRITES, |
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DQST_CACHE_HITS, |
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DQST_ALLOC_DQUOTS, |
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DQST_FREE_DQUOTS, |
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DQST_SYNCS, |
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_DQST_DQSTAT_LAST |
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}; |
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struct dqstats { |
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unsigned long stat[_DQST_DQSTAT_LAST]; |
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struct percpu_counter counter[_DQST_DQSTAT_LAST]; |
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}; |
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extern struct dqstats dqstats; |
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static inline void dqstats_inc(unsigned int type) |
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{ |
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percpu_counter_inc(&dqstats.counter[type]); |
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} |
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static inline void dqstats_dec(unsigned int type) |
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{ |
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percpu_counter_dec(&dqstats.counter[type]); |
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} |
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#define DQ_MOD_B 0 /* dquot modified since read */ |
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#define DQ_BLKS_B 1 /* uid/gid has been warned about blk limit */ |
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#define DQ_INODES_B 2 /* uid/gid has been warned about inode limit */ |
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#define DQ_FAKE_B 3 /* no limits only usage */ |
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#define DQ_READ_B 4 /* dquot was read into memory */ |
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#define DQ_ACTIVE_B 5 /* dquot is active (dquot_release not called) */ |
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#define DQ_LASTSET_B 6 /* Following 6 bits (see QIF_) are reserved\ |
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* for the mask of entries set via SETQUOTA\ |
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* quotactl. They are set under dq_data_lock\ |
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* and the quota format handling dquot can\ |
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* clear them when it sees fit. */ |
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|
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struct dquot { |
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struct hlist_node dq_hash; /* Hash list in memory [dq_list_lock] */ |
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struct list_head dq_inuse; /* List of all quotas [dq_list_lock] */ |
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struct list_head dq_free; /* Free list element [dq_list_lock] */ |
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struct list_head dq_dirty; /* List of dirty dquots [dq_list_lock] */ |
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struct mutex dq_lock; /* dquot IO lock */ |
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spinlock_t dq_dqb_lock; /* Lock protecting dq_dqb changes */ |
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atomic_t dq_count; /* Use count */ |
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struct super_block *dq_sb; /* superblock this applies to */ |
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struct kqid dq_id; /* ID this applies to (uid, gid, projid) */ |
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loff_t dq_off; /* Offset of dquot on disk [dq_lock, stable once set] */ |
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unsigned long dq_flags; /* See DQ_* */ |
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struct mem_dqblk dq_dqb; /* Diskquota usage [dq_dqb_lock] */ |
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}; |
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/* Operations which must be implemented by each quota format */ |
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struct quota_format_ops { |
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int (*check_quota_file)(struct super_block *sb, int type); /* Detect whether file is in our format */ |
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int (*read_file_info)(struct super_block *sb, int type); /* Read main info about file - called on quotaon() */ |
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int (*write_file_info)(struct super_block *sb, int type); /* Write main info about file */ |
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int (*free_file_info)(struct super_block *sb, int type); /* Called on quotaoff() */ |
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int (*read_dqblk)(struct dquot *dquot); /* Read structure for one user */ |
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int (*commit_dqblk)(struct dquot *dquot); /* Write structure for one user */ |
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int (*release_dqblk)(struct dquot *dquot); /* Called when last reference to dquot is being dropped */ |
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int (*get_next_id)(struct super_block *sb, struct kqid *qid); /* Get next ID with existing structure in the quota file */ |
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}; |
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|
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/* Operations working with dquots */ |
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struct dquot_operations { |
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int (*write_dquot) (struct dquot *); /* Ordinary dquot write */ |
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struct dquot *(*alloc_dquot)(struct super_block *, int); /* Allocate memory for new dquot */ |
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void (*destroy_dquot)(struct dquot *); /* Free memory for dquot */ |
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int (*acquire_dquot) (struct dquot *); /* Quota is going to be created on disk */ |
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int (*release_dquot) (struct dquot *); /* Quota is going to be deleted from disk */ |
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int (*mark_dirty) (struct dquot *); /* Dquot is marked dirty */ |
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int (*write_info) (struct super_block *, int); /* Write of quota "superblock" */ |
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/* get reserved quota for delayed alloc, value returned is managed by |
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* quota code only */ |
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qsize_t *(*get_reserved_space) (struct inode *); |
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int (*get_projid) (struct inode *, kprojid_t *);/* Get project ID */ |
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/* Get number of inodes that were charged for a given inode */ |
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int (*get_inode_usage) (struct inode *, qsize_t *); |
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/* Get next ID with active quota structure */ |
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int (*get_next_id) (struct super_block *sb, struct kqid *qid); |
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}; |
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struct path; |
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|
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/* Structure for communicating via ->get_dqblk() & ->set_dqblk() */ |
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struct qc_dqblk { |
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int d_fieldmask; /* mask of fields to change in ->set_dqblk() */ |
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u64 d_spc_hardlimit; /* absolute limit on used space */ |
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u64 d_spc_softlimit; /* preferred limit on used space */ |
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u64 d_ino_hardlimit; /* maximum # allocated inodes */ |
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u64 d_ino_softlimit; /* preferred inode limit */ |
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u64 d_space; /* Space owned by the user */ |
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u64 d_ino_count; /* # inodes owned by the user */ |
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s64 d_ino_timer; /* zero if within inode limits */ |
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/* if not, we refuse service */ |
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s64 d_spc_timer; /* similar to above; for space */ |
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int d_ino_warns; /* # warnings issued wrt num inodes */ |
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int d_spc_warns; /* # warnings issued wrt used space */ |
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u64 d_rt_spc_hardlimit; /* absolute limit on realtime space */ |
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u64 d_rt_spc_softlimit; /* preferred limit on RT space */ |
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u64 d_rt_space; /* realtime space owned */ |
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s64 d_rt_spc_timer; /* similar to above; for RT space */ |
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int d_rt_spc_warns; /* # warnings issued wrt RT space */ |
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}; |
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|
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/* |
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* Field specifiers for ->set_dqblk() in struct qc_dqblk and also for |
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* ->set_info() in struct qc_info |
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*/ |
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#define QC_INO_SOFT (1<<0) |
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#define QC_INO_HARD (1<<1) |
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#define QC_SPC_SOFT (1<<2) |
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#define QC_SPC_HARD (1<<3) |
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#define QC_RT_SPC_SOFT (1<<4) |
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#define QC_RT_SPC_HARD (1<<5) |
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#define QC_LIMIT_MASK (QC_INO_SOFT | QC_INO_HARD | QC_SPC_SOFT | QC_SPC_HARD | \ |
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QC_RT_SPC_SOFT | QC_RT_SPC_HARD) |
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#define QC_SPC_TIMER (1<<6) |
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#define QC_INO_TIMER (1<<7) |
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#define QC_RT_SPC_TIMER (1<<8) |
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#define QC_TIMER_MASK (QC_SPC_TIMER | QC_INO_TIMER | QC_RT_SPC_TIMER) |
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#define QC_SPC_WARNS (1<<9) |
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#define QC_INO_WARNS (1<<10) |
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#define QC_RT_SPC_WARNS (1<<11) |
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#define QC_WARNS_MASK (QC_SPC_WARNS | QC_INO_WARNS | QC_RT_SPC_WARNS) |
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#define QC_SPACE (1<<12) |
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#define QC_INO_COUNT (1<<13) |
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#define QC_RT_SPACE (1<<14) |
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#define QC_ACCT_MASK (QC_SPACE | QC_INO_COUNT | QC_RT_SPACE) |
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#define QC_FLAGS (1<<15) |
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|
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#define QCI_SYSFILE (1 << 0) /* Quota file is hidden from userspace */ |
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#define QCI_ROOT_SQUASH (1 << 1) /* Root squash turned on */ |
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#define QCI_ACCT_ENABLED (1 << 2) /* Quota accounting enabled */ |
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#define QCI_LIMITS_ENFORCED (1 << 3) /* Quota limits enforced */ |
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|
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/* Structures for communicating via ->get_state */ |
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struct qc_type_state { |
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unsigned int flags; /* Flags QCI_* */ |
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unsigned int spc_timelimit; /* Time after which space softlimit is |
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* enforced */ |
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unsigned int ino_timelimit; /* Ditto for inode softlimit */ |
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unsigned int rt_spc_timelimit; /* Ditto for real-time space */ |
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unsigned int spc_warnlimit; /* Limit for number of space warnings */ |
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unsigned int ino_warnlimit; /* Ditto for inodes */ |
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unsigned int rt_spc_warnlimit; /* Ditto for real-time space */ |
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unsigned long long ino; /* Inode number of quota file */ |
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blkcnt_t blocks; /* Number of 512-byte blocks in the file */ |
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blkcnt_t nextents; /* Number of extents in the file */ |
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}; |
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|
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struct qc_state { |
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unsigned int s_incoredqs; /* Number of dquots in core */ |
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struct qc_type_state s_state[MAXQUOTAS]; /* Per quota type information */ |
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}; |
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|
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/* Structure for communicating via ->set_info */ |
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struct qc_info { |
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int i_fieldmask; /* mask of fields to change in ->set_info() */ |
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unsigned int i_flags; /* Flags QCI_* */ |
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unsigned int i_spc_timelimit; /* Time after which space softlimit is |
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* enforced */ |
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unsigned int i_ino_timelimit; /* Ditto for inode softlimit */ |
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unsigned int i_rt_spc_timelimit;/* Ditto for real-time space */ |
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unsigned int i_spc_warnlimit; /* Limit for number of space warnings */ |
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unsigned int i_ino_warnlimit; /* Limit for number of inode warnings */ |
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unsigned int i_rt_spc_warnlimit; /* Ditto for real-time space */ |
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}; |
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|
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/* Operations handling requests from userspace */ |
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struct quotactl_ops { |
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int (*quota_on)(struct super_block *, int, int, const struct path *); |
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int (*quota_off)(struct super_block *, int); |
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int (*quota_enable)(struct super_block *, unsigned int); |
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int (*quota_disable)(struct super_block *, unsigned int); |
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int (*quota_sync)(struct super_block *, int); |
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int (*set_info)(struct super_block *, int, struct qc_info *); |
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int (*get_dqblk)(struct super_block *, struct kqid, struct qc_dqblk *); |
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int (*get_nextdqblk)(struct super_block *, struct kqid *, |
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struct qc_dqblk *); |
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int (*set_dqblk)(struct super_block *, struct kqid, struct qc_dqblk *); |
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int (*get_state)(struct super_block *, struct qc_state *); |
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int (*rm_xquota)(struct super_block *, unsigned int); |
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}; |
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|
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struct quota_format_type { |
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int qf_fmt_id; /* Quota format id */ |
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const struct quota_format_ops *qf_ops; /* Operations of format */ |
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struct module *qf_owner; /* Module implementing quota format */ |
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struct quota_format_type *qf_next; |
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}; |
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|
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/** |
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* Quota state flags - they come in three flavors - for users, groups and projects. |
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* |
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* Actual typed flags layout: |
|
* USRQUOTA GRPQUOTA PRJQUOTA |
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* DQUOT_USAGE_ENABLED 0x0001 0x0002 0x0004 |
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* DQUOT_LIMITS_ENABLED 0x0008 0x0010 0x0020 |
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* DQUOT_SUSPENDED 0x0040 0x0080 0x0100 |
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* |
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* Following bits are used for non-typed flags: |
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* DQUOT_QUOTA_SYS_FILE 0x0200 |
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* DQUOT_NEGATIVE_USAGE 0x0400 |
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* DQUOT_NOLIST_DIRTY 0x0800 |
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*/ |
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enum { |
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_DQUOT_USAGE_ENABLED = 0, /* Track disk usage for users */ |
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_DQUOT_LIMITS_ENABLED, /* Enforce quota limits for users */ |
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_DQUOT_SUSPENDED, /* User diskquotas are off, but |
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* we have necessary info in |
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* memory to turn them on */ |
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_DQUOT_STATE_FLAGS |
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}; |
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#define DQUOT_USAGE_ENABLED (1 << _DQUOT_USAGE_ENABLED * MAXQUOTAS) |
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#define DQUOT_LIMITS_ENABLED (1 << _DQUOT_LIMITS_ENABLED * MAXQUOTAS) |
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#define DQUOT_SUSPENDED (1 << _DQUOT_SUSPENDED * MAXQUOTAS) |
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#define DQUOT_STATE_FLAGS (DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED | \ |
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DQUOT_SUSPENDED) |
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/* Other quota flags */ |
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#define DQUOT_STATE_LAST (_DQUOT_STATE_FLAGS * MAXQUOTAS) |
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#define DQUOT_QUOTA_SYS_FILE (1 << DQUOT_STATE_LAST) |
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/* Quota file is a special |
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* system file and user cannot |
|
* touch it. Filesystem is |
|
* responsible for setting |
|
* S_NOQUOTA, S_NOATIME flags |
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*/ |
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#define DQUOT_NEGATIVE_USAGE (1 << (DQUOT_STATE_LAST + 1)) |
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/* Allow negative quota usage */ |
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/* Do not track dirty dquots in a list */ |
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#define DQUOT_NOLIST_DIRTY (1 << (DQUOT_STATE_LAST + 2)) |
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|
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static inline unsigned int dquot_state_flag(unsigned int flags, int type) |
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{ |
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return flags << type; |
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} |
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|
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static inline unsigned int dquot_generic_flag(unsigned int flags, int type) |
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{ |
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return (flags >> type) & DQUOT_STATE_FLAGS; |
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} |
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|
|
/* Bitmap of quota types where flag is set in flags */ |
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static __always_inline unsigned dquot_state_types(unsigned flags, unsigned flag) |
|
{ |
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BUILD_BUG_ON_NOT_POWER_OF_2(flag); |
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return (flags / flag) & ((1 << MAXQUOTAS) - 1); |
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} |
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|
|
#ifdef CONFIG_QUOTA_NETLINK_INTERFACE |
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extern void quota_send_warning(struct kqid qid, dev_t dev, |
|
const char warntype); |
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#else |
|
static inline void quota_send_warning(struct kqid qid, dev_t dev, |
|
const char warntype) |
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{ |
|
return; |
|
} |
|
#endif /* CONFIG_QUOTA_NETLINK_INTERFACE */ |
|
|
|
struct quota_info { |
|
unsigned int flags; /* Flags for diskquotas on this device */ |
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struct rw_semaphore dqio_sem; /* Lock quota file while I/O in progress */ |
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struct inode *files[MAXQUOTAS]; /* inodes of quotafiles */ |
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struct mem_dqinfo info[MAXQUOTAS]; /* Information for each quota type */ |
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const struct quota_format_ops *ops[MAXQUOTAS]; /* Operations for each type */ |
|
}; |
|
|
|
int register_quota_format(struct quota_format_type *fmt); |
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void unregister_quota_format(struct quota_format_type *fmt); |
|
|
|
struct quota_module_name { |
|
int qm_fmt_id; |
|
char *qm_mod_name; |
|
}; |
|
|
|
#define INIT_QUOTA_MODULE_NAMES {\ |
|
{QFMT_VFS_OLD, "quota_v1"},\ |
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{QFMT_VFS_V0, "quota_v2"},\ |
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{QFMT_VFS_V1, "quota_v2"},\ |
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{0, NULL}} |
|
|
|
#endif /* _QUOTA_ */
|
|
|