sys/vfs/ufs/quota.h

   1 /*-
   2  * Copyright (c) 1982, 1986, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Robert Elz at The University of Melbourne.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by the University of
  19  *      California, Berkeley and its contributors.
  20  * 4. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  *
  36  *      @(#)quota.h     8.3 (Berkeley) 8/19/94
  37  * $FreeBSD: src/sys/ufs/ufs/quota.h,v 1.15.2.1 2003/02/27 12:04:13 das Exp $
  38  * $DragonFly: src/sys/vfs/ufs/quota.h,v 1.9 2007/11/06 17:11:38 dillon Exp $
  39  */
  40
  41 #ifndef _VFS_UFS_QUOTA_H_
  42 #define _VFS_UFS_QUOTA_H_
  43
  44 /*
  45  * Definitions for disk quotas imposed on the average user
  46  * (big brother finally hits UNIX).
  47  *
  48  * The following constants define the amount of time given a user before the
  49  * soft limits are treated as hard limits (usually resulting in an allocation
  50  * failure). The timer is started when the user crosses their soft limit, it
  51  * is reset when they go below their soft limit.
  52  */
  53 #define MAX_IQ_TIME     (7*24*60*60)    /* seconds in 1 week */
  54 #define MAX_DQ_TIME     (7*24*60*60)    /* seconds in 1 week */
  55
  56 /*
  57  * The following constants define the usage of the quota file array in the
  58  * ufsmount structure and dquot array in the inode structure.  The semantics
  59  * of the elements of these arrays are defined in the routine getinoquota;
  60  * the remainder of the quota code treats them generically and need not be
  61  * inspected when changing the size of the array.
  62  */
  63 #define MAXQUOTAS       2
  64 #define USRQUOTA        0       /* element used for user quotas */
  65 #define GRPQUOTA        1       /* element used for group quotas */
  66
  67 /*
  68  * Definitions for the default names of the quotas files.
  69  */
  70 #define INITQFNAMES { \
  71         "user",         /* USRQUOTA */ \
  72         "group",        /* GRPQUOTA */ \
  73         "undefined", \
  74 }
  75 #define QUOTAFILENAME   "quota"
  76 #define QUOTAGROUP      "operator"
  77
  78 /*
  79  * Command definitions for the 'quotactl' system call.  The commands are
  80  * broken into a main command defined below and a subcommand that is used
  81  * to convey the type of quota that is being manipulated (see above).
  82  */
  83 #define SUBCMDMASK      0x00ff
  84 #define SUBCMDSHIFT     8
  85 #define QCMD(cmd, type) (((cmd) << SUBCMDSHIFT) | ((type) & SUBCMDMASK))
  86
  87 #define Q_QUOTAON       0x0100  /* enable quotas */
  88 #define Q_QUOTAOFF      0x0200  /* disable quotas */
  89 #define Q_GETQUOTA      0x0300  /* get limits and usage */
  90 #define Q_SETQUOTA      0x0400  /* set limits and usage */
  91 #define Q_SETUSE        0x0500  /* set usage */
  92 #define Q_SYNC          0x0600  /* sync disk copy of a filesystems quotas */
  93
  94 /*
  95  * The following structure defines the format of the disk quota file
  96  * (as it appears on disk) - the file is an array of these structures
  97  * indexed by user or group number.  The setquota system call establishes
  98  * the vnode for each quota file (a pointer is retained in the ufsmount
  99  * structure).
 100  */
 101 struct ufs_dqblk {
 102         uint32_t dqb_bhardlimit;        /* absolute limit on disk blks alloc */
 103         uint32_t dqb_bsoftlimit;        /* preferred limit on disk blks */
 104         uint32_t dqb_curblocks; /* current block count */
 105         uint32_t dqb_ihardlimit;        /* maximum # allocated inodes + 1 */
 106         uint32_t dqb_isoftlimit;        /* preferred inode limit */
 107         uint32_t dqb_curinodes; /* current # allocated inodes */
 108         time_t    dqb_btime;            /* time limit for excessive disk use */
 109         time_t    dqb_itime;            /* time limit for excessive files */
 110 };
 111
 112 #ifdef _KERNEL
 113
 114 #include <sys/queue.h>
 115
 116 /*
 117  * The following structure records disk usage for a user or group on a
 118  * filesystem. There is one allocated for each quota that exists on any
 119  * filesystem for the current user or group. A cache is kept of recently
 120  * used entries.
 121  */
 122 struct ufs_dquot {
 123         LIST_ENTRY(ufs_dquot) dq_hash;  /* hash list */
 124         TAILQ_ENTRY(ufs_dquot) dq_freelist;     /* free list */
 125         uint16_t dq_flags;              /* flags, see below */
 126         uint16_t dq_type;               /* quota type of this dquot */
 127         uint32_t dq_cnt;                /* count of active references */
 128         uint32_t dq_id;                 /* identifier this applies to */
 129         struct  ufsmount *dq_ump;       /* filesystem that this is taken from */
 130         struct  ufs_dqblk dq_dqb;       /* actual usage & quotas */
 131 };
 132 /*
 133  * Flag values.
 134  */
 135 #define DQ_LOCK         0x01            /* this quota locked (no MODS) */
 136 #define DQ_WANT         0x02            /* wakeup on unlock */
 137 #define DQ_MOD          0x04            /* this quota modified since read */
 138 #define DQ_FAKE         0x08            /* no limits here, just usage */
 139 #define DQ_BLKS         0x10            /* has been warned about blk limit */
 140 #define DQ_INODS        0x20            /* has been warned about inode limit */
 141 /*
 142  * Shorthand notation.
 143  */
 144 #define dq_bhardlimit   dq_dqb.dqb_bhardlimit
 145 #define dq_bsoftlimit   dq_dqb.dqb_bsoftlimit
 146 #define dq_curblocks    dq_dqb.dqb_curblocks
 147 #define dq_ihardlimit   dq_dqb.dqb_ihardlimit
 148 #define dq_isoftlimit   dq_dqb.dqb_isoftlimit
 149 #define dq_curinodes    dq_dqb.dqb_curinodes
 150 #define dq_btime        dq_dqb.dqb_btime
 151 #define dq_itime        dq_dqb.dqb_itime
 152
 153 /*
 154  * If the system has never checked for a quota for this file, then it is
 155  * set to NODQUOT.  Once a write attempt is made the inode pointer is set
 156  * to reference a dquot structure.
 157  */
 158 #define NODQUOT         NULL
 159
 160 /*
 161  * Flags to ufs_chkdq() and ufs_chkiq()
 162  */
 163 #define FORCE   0x01    /* force usage changes independent of limits */
 164 #define CHOWN   0x02    /* (advisory) change initiated by chown */
 165
 166 /*
 167  * Macros to avoid subroutine calls to trivial functions.
 168  */
 169 #ifdef DIAGNOSTIC
 170 #define DQREF(dq)       ufs_dqref(dq)
 171 #else
 172 #define DQREF(dq)       (dq)->dq_cnt++
 173 #endif
 174
 175 struct inode;
 176 struct mount;
 177 struct proc;
 178 struct thread;
 179 struct ucred;
 180 struct vnode;
 181
 182 int     ufs_chkdq(struct inode *, long, struct ucred *, int);
 183 int     ufs_chkiq(struct inode *, long, struct ucred *, int);
 184 void    ufs_dqinit(void);
 185 void    ufs_dqrele(struct vnode *, struct ufs_dquot *);
 186 int     ufs_getinoquota(struct inode *);
 187 int     ufs_getquota(struct mount *, u_long, int, caddr_t);
 188 int     ufs_qsync(struct mount *mp);
 189 int     ufs_quotaoff(struct mount *, int);
 190 int     ufs_quotaon(struct ucred *, struct mount *, int, caddr_t);
 191 int     ufs_setquota(struct mount *, u_long, int, caddr_t);
 192 int     ufs_setuse(struct mount *, u_long, int, caddr_t);
 193 int     ufs_quotactl(struct mount *, int, uid_t, caddr_t, struct ucred *);
 194
 195 #else /* !_KERNEL */
 196
 197 #include <sys/cdefs.h>
 198
 199 __BEGIN_DECLS
 200 int     quotactl(const char *, int, int, void *);
 201 __END_DECLS
 202
 203 #endif /* _KERNEL */
 204
 205 #endif /* !_VFS_UFS_QUOTA_H_ */