![David Howells](/assets/img/avatar_default.png)
Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Michael Kerrisk <mtk.manpages@gmail.com> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Acked-by: Dave Jones <davej@redhat.com>
411 lines
14 KiB
C
411 lines
14 KiB
C
/*
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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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#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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#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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#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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#undef USRQUOTA
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#undef GRPQUOTA
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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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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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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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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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* 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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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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* 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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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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* 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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* 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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* 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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extern spinlock_t dq_data_lock;
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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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* 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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time_t dqb_btime; /* time limit for excessive disk use */
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time_t dqb_itime; /* time limit for excessive inode use */
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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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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 */
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unsigned long dqi_flags;
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unsigned int dqi_bgrace;
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unsigned int dqi_igrace;
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qsize_t dqi_maxblimit;
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qsize_t dqi_maxilimit;
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void *dqi_priv;
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};
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struct super_block;
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#define DQF_MASK 0xffff /* Mask for format specific flags */
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#define DQF_GETINFO_MASK 0x1ffff /* Mask for flags passed to userspace */
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#define DQF_SETINFO_MASK 0xffff /* Mask for flags modifiable from userspace */
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#define DQF_SYS_FILE_B 16
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#define DQF_SYS_FILE (1 << DQF_SYS_FILE_B) /* Quota file stored as system file */
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#define DQF_INFO_DIRTY_B 31
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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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int 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_pcpu;
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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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struct dquot {
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struct hlist_node dq_hash; /* Hash list in memory */
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struct list_head dq_inuse; /* List of all quotas */
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struct list_head dq_free; /* Free list element */
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struct list_head dq_dirty; /* List of dirty dquots */
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struct mutex dq_lock; /* dquot IO lock */
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atomic_t dq_count; /* Use count */
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wait_queue_head_t dq_wait_unused; /* Wait queue for dquot to become unused */
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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 */
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unsigned long dq_flags; /* See DQ_* */
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struct mem_dqblk dq_dqb; /* Diskquota usage */
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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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};
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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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};
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struct path;
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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, struct path *);
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int (*quota_on_meta)(struct super_block *, int, int);
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int (*quota_off)(struct super_block *, int);
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int (*quota_sync)(struct super_block *, int);
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int (*get_info)(struct super_block *, int, struct if_dqinfo *);
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int (*set_info)(struct super_block *, int, struct if_dqinfo *);
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int (*get_dqblk)(struct super_block *, struct kqid, struct fs_disk_quota *);
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int (*set_dqblk)(struct super_block *, struct kqid, struct fs_disk_quota *);
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int (*get_xstate)(struct super_block *, struct fs_quota_stat *);
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int (*set_xstate)(struct super_block *, unsigned int, int);
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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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/* Quota state flags - they actually come in two flavors - for users and groups */
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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)
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#define DQUOT_LIMITS_ENABLED (1 << _DQUOT_LIMITS_ENABLED)
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#define DQUOT_SUSPENDED (1 << _DQUOT_SUSPENDED)
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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
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* touch it. Filesystem is
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* responsible for setting
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* 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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static inline unsigned int dquot_state_flag(unsigned int flags, int type)
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{
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return flags << _DQUOT_STATE_FLAGS * type;
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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 >> _DQUOT_STATE_FLAGS * type) & DQUOT_STATE_FLAGS;
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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,
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const char warntype);
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#else
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static inline void quota_send_warning(struct kqid qid, dev_t dev,
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const char warntype)
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{
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return;
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}
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#endif /* CONFIG_QUOTA_NETLINK_INTERFACE */
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struct quota_info {
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unsigned int flags; /* Flags for diskquotas on this device */
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struct mutex dqio_mutex; /* lock device while I/O in progress */
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struct mutex dqonoff_mutex; /* Serialize quotaon & quotaoff */
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struct rw_semaphore dqptr_sem; /* serialize ops using quota_info struct, pointers from inode to dquots */
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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 */
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};
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int register_quota_format(struct quota_format_type *fmt);
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void unregister_quota_format(struct quota_format_type *fmt);
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struct quota_module_name {
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int qm_fmt_id;
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char *qm_mod_name;
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};
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#define INIT_QUOTA_MODULE_NAMES {\
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{QFMT_VFS_OLD, "quota_v1"},\
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{QFMT_VFS_V0, "quota_v2"},\
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{0, NULL}}
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#endif /* _QUOTA_ */
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