405 lines
14 KiB
C
405 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/errno.h>
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#include <linux/types.h>
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#define __DQUOT_VERSION__ "dquot_6.5.2"
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#define MAXQUOTAS 2
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#define USRQUOTA 0 /* element used for user quotas */
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#define GRPQUOTA 1 /* element used for group quotas */
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/*
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* Definitions for the default names of the quotas files.
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*/
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#define INITQFNAMES { \
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"user", /* USRQUOTA */ \
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"group", /* GRPQUOTA */ \
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"undefined", \
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};
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/*
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* Command definitions for the 'quotactl' system call.
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* The commands are broken into a main command defined below
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* and a subcommand that is used to convey the type of
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* quota that is being manipulated (see above).
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*/
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#define SUBCMDMASK 0x00ff
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#define SUBCMDSHIFT 8
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#define QCMD(cmd, type) (((cmd) << SUBCMDSHIFT) | ((type) & SUBCMDMASK))
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#define Q_SYNC 0x800001 /* sync disk copy of a filesystems quotas */
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#define Q_QUOTAON 0x800002 /* turn quotas on */
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#define Q_QUOTAOFF 0x800003 /* turn quotas off */
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#define Q_GETFMT 0x800004 /* get quota format used on given filesystem */
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#define Q_GETINFO 0x800005 /* get information about quota files */
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#define Q_SETINFO 0x800006 /* set information about quota files */
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#define Q_GETQUOTA 0x800007 /* get user quota structure */
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#define Q_SETQUOTA 0x800008 /* set user quota structure */
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/* Quota format type IDs */
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#define QFMT_VFS_OLD 1
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#define QFMT_VFS_V0 2
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/* Size of block in which space limits are passed through the quota
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* interface */
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#define QIF_DQBLKSIZE_BITS 10
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#define QIF_DQBLKSIZE (1 << QIF_DQBLKSIZE_BITS)
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/*
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* Quota structure used for communication with userspace via quotactl
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* Following flags are used to specify which fields are valid
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*/
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enum {
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QIF_BLIMITS_B = 0,
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QIF_SPACE_B,
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QIF_ILIMITS_B,
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QIF_INODES_B,
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QIF_BTIME_B,
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QIF_ITIME_B,
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};
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#define QIF_BLIMITS (1 << QIF_BLIMITS_B)
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#define QIF_SPACE (1 << QIF_SPACE_B)
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#define QIF_ILIMITS (1 << QIF_ILIMITS_B)
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#define QIF_INODES (1 << QIF_INODES_B)
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#define QIF_BTIME (1 << QIF_BTIME_B)
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#define QIF_ITIME (1 << QIF_ITIME_B)
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#define QIF_LIMITS (QIF_BLIMITS | QIF_ILIMITS)
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#define QIF_USAGE (QIF_SPACE | QIF_INODES)
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#define QIF_TIMES (QIF_BTIME | QIF_ITIME)
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#define QIF_ALL (QIF_LIMITS | QIF_USAGE | QIF_TIMES)
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struct if_dqblk {
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__u64 dqb_bhardlimit;
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__u64 dqb_bsoftlimit;
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__u64 dqb_curspace;
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__u64 dqb_ihardlimit;
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__u64 dqb_isoftlimit;
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__u64 dqb_curinodes;
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__u64 dqb_btime;
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__u64 dqb_itime;
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__u32 dqb_valid;
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};
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/*
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* Structure used for setting quota information about file via quotactl
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* Following flags are used to specify which fields are valid
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*/
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#define IIF_BGRACE 1
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#define IIF_IGRACE 2
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#define IIF_FLAGS 4
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#define IIF_ALL (IIF_BGRACE | IIF_IGRACE | IIF_FLAGS)
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struct if_dqinfo {
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__u64 dqi_bgrace;
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__u64 dqi_igrace;
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__u32 dqi_flags;
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__u32 dqi_valid;
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};
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/*
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* Definitions for quota netlink interface
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*/
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#define QUOTA_NL_NOWARN 0
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#define QUOTA_NL_IHARDWARN 1 /* Inode hardlimit reached */
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#define QUOTA_NL_ISOFTLONGWARN 2 /* Inode grace time expired */
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#define QUOTA_NL_ISOFTWARN 3 /* Inode softlimit reached */
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#define QUOTA_NL_BHARDWARN 4 /* Block hardlimit reached */
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#define QUOTA_NL_BSOFTLONGWARN 5 /* Block grace time expired */
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#define QUOTA_NL_BSOFTWARN 6 /* Block softlimit reached */
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#define QUOTA_NL_IHARDBELOW 7 /* Usage got below inode hardlimit */
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#define QUOTA_NL_ISOFTBELOW 8 /* Usage got below inode softlimit */
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#define QUOTA_NL_BHARDBELOW 9 /* Usage got below block hardlimit */
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#define QUOTA_NL_BSOFTBELOW 10 /* Usage got below block softlimit */
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enum {
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QUOTA_NL_C_UNSPEC,
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QUOTA_NL_C_WARNING,
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__QUOTA_NL_C_MAX,
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};
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#define QUOTA_NL_C_MAX (__QUOTA_NL_C_MAX - 1)
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enum {
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QUOTA_NL_A_UNSPEC,
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QUOTA_NL_A_QTYPE,
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QUOTA_NL_A_EXCESS_ID,
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QUOTA_NL_A_WARNING,
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QUOTA_NL_A_DEV_MAJOR,
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QUOTA_NL_A_DEV_MINOR,
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QUOTA_NL_A_CAUSED_ID,
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__QUOTA_NL_A_MAX,
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};
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#define QUOTA_NL_A_MAX (__QUOTA_NL_A_MAX - 1)
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#ifdef __KERNEL__
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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/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 <asm/atomic.h>
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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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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_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_INFO_DIRTY_B 16
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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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struct dqstats {
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int lookups;
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int drops;
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int reads;
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int writes;
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int cache_hits;
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int allocated_dquots;
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int free_dquots;
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int syncs;
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};
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extern struct dqstats dqstats;
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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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unsigned int dq_id; /* ID this applies to (uid, gid) */
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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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short dq_type; /* Type of quota */
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struct mem_dqblk dq_dqb; /* Diskquota usage */
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};
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#define NODQUOT (struct dquot *)NULL
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#define QUOTA_OK 0
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#define NO_QUOTA 1
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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 (*initialize) (struct inode *, int);
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int (*drop) (struct inode *);
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int (*alloc_space) (struct inode *, qsize_t, int);
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int (*alloc_inode) (const struct inode *, qsize_t);
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int (*free_space) (struct inode *, qsize_t);
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int (*free_inode) (const struct inode *, qsize_t);
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int (*transfer) (struct inode *, struct iattr *);
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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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};
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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, char *, int);
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int (*quota_off)(struct super_block *, int, 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 *, int, qid_t, struct if_dqblk *);
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int (*set_dqblk)(struct super_block *, int, qid_t, struct if_dqblk *);
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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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int (*get_xquota)(struct super_block *, int, qid_t, struct fs_disk_quota *);
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int (*set_xquota)(struct super_block *, int, qid_t, struct fs_disk_quota *);
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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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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_QUOTA_SYS_FILE (1 << 6) /* 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 << 7) /* 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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if (type == USRQUOTA)
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return flags;
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return flags << _DQUOT_STATE_FLAGS;
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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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if (type == USRQUOTA)
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return flags;
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return flags >> _DQUOT_STATE_FLAGS;
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}
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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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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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#else
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# /* nodep */ include <sys/cdefs.h>
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__BEGIN_DECLS
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long quotactl __P ((unsigned int, const char *, int, caddr_t));
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__END_DECLS
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#endif /* __KERNEL__ */
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#endif /* _QUOTA_ */
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