1 /* 2 * Copyright (c) 1982, 1986 Regents of the University of California. 3 * 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 * %sccs.include.redist.c% 9 * 10 * @(#)quota.h 7.9 (Berkeley) 02/22/91 11 */ 12 13 #ifndef _QUOTA_ 14 #define _QUOTA_ 15 16 /* 17 * Definitions for disk quotas imposed on the average user 18 * (big brother finally hits UNIX). 19 * 20 * The following constants define the amount of time given a user 21 * before the soft limits are treated as hard limits (usually resulting 22 * in an allocation failure). The timer is started when the user crosses 23 * their soft limit, it is reset when they go below their soft limit. 24 */ 25 #define MAX_IQ_TIME (7*24*60*60) /* 1 week */ 26 #define MAX_DQ_TIME (7*24*60*60) /* 1 week */ 27 28 /* 29 * The following constants define the usage of the quota file array 30 * in the ufsmount structure and dquot array in the inode structure. 31 * The semantics of the elements of these arrays are defined in the 32 * routine getinoquota; the remainder of the quota code treats them 33 * generically and need not be inspected when changing the size of 34 * the array. 35 */ 36 #define MAXQUOTAS 2 37 #define USRQUOTA 0 /* element used for user quotas */ 38 #define GRPQUOTA 1 /* element used for group quotas */ 39 40 /* 41 * Definitions for the default names of the quotas files. 42 */ 43 #define INITQFNAMES { \ 44 "user", /* USRQUOTA */ \ 45 "group", /* GRPQUOTA */ \ 46 "undefined", \ 47 }; 48 #define QUOTAFILENAME "quota" 49 #define QUOTAGROUP "operator" 50 51 /* 52 * Command definitions for the 'quotactl' system call. 53 * The commands are broken into a main command defined below 54 * and a subcommand that is used to convey the type of 55 * quota that is being manipulated (see above). 56 */ 57 #define SUBCMDMASK 0x00ff 58 #define SUBCMDSHIFT 8 59 #define QCMD(cmd, type) (((cmd) << SUBCMDSHIFT) | ((type) & SUBCMDMASK)) 60 61 #define Q_QUOTAON 0x0100 /* enable quotas */ 62 #define Q_QUOTAOFF 0x0200 /* disable quotas */ 63 #define Q_GETQUOTA 0x0300 /* get limits and usage */ 64 #define Q_SETQUOTA 0x0400 /* set limits and usage */ 65 #define Q_SETUSE 0x0500 /* set usage */ 66 #define Q_SYNC 0x0600 /* sync disk copy of a filesystems quotas */ 67 68 /* 69 * The following structure defines the format of the disk quota file 70 * (as it appears on disk) - the file is an array of these structures 71 * indexed by user or group number. The setquota system call establishes 72 * the vnode for each quota file (a pointer is retained in the ufsmount 73 * structure). 74 */ 75 struct dqblk { 76 u_long dqb_bhardlimit; /* absolute limit on disk blks alloc */ 77 u_long dqb_bsoftlimit; /* preferred limit on disk blks */ 78 u_long dqb_curblocks; /* current block count */ 79 u_long dqb_ihardlimit; /* maximum # allocated inodes + 1 */ 80 u_long dqb_isoftlimit; /* preferred inode limit */ 81 u_long dqb_curinodes; /* current # allocated inodes */ 82 time_t dqb_btime; /* time limit for excessive disk use */ 83 time_t dqb_itime; /* time limit for excessive files */ 84 }; 85 86 #ifdef KERNEL 87 /* 88 * The following structure records disk usage for a user or group on a 89 * filesystem. There is one allocated for each quota that exists on any 90 * filesystem for the current user or group. A cache is kept of recently 91 * used entries. 92 */ 93 struct dquot { 94 struct dquot *dq_forw, *dq_back;/* MUST be first entry */ 95 struct dquot *dq_freef, **dq_freeb; /* free list */ 96 short dq_flags; /* flags, see below */ 97 short dq_cnt; /* count of active references */ 98 short dq_spare; /* unused spare padding */ 99 short dq_type; /* quota type of this dquot */ 100 u_long dq_id; /* identifier this applies to */ 101 struct ufsmount *dq_ump; /* filesystem that this is taken from */ 102 struct dqblk dq_dqb; /* actual usage & quotas */ 103 }; 104 /* 105 * Flag values. 106 */ 107 #define DQ_LOCK 0x01 /* this quota locked (no MODS) */ 108 #define DQ_WANT 0x02 /* wakeup on unlock */ 109 #define DQ_MOD 0x04 /* this quota modified since read */ 110 #define DQ_FAKE 0x08 /* no limits here, just usage */ 111 #define DQ_BLKS 0x10 /* has been warned about blk limit */ 112 #define DQ_INODS 0x20 /* has been warned about inode limit */ 113 /* 114 * Shorthand notation. 115 */ 116 #define dq_bhardlimit dq_dqb.dqb_bhardlimit 117 #define dq_bsoftlimit dq_dqb.dqb_bsoftlimit 118 #define dq_curblocks dq_dqb.dqb_curblocks 119 #define dq_ihardlimit dq_dqb.dqb_ihardlimit 120 #define dq_isoftlimit dq_dqb.dqb_isoftlimit 121 #define dq_curinodes dq_dqb.dqb_curinodes 122 #define dq_btime dq_dqb.dqb_btime 123 #define dq_itime dq_dqb.dqb_itime 124 125 /* 126 * If the system has never checked for a quota for this file, 127 * then it is set to NODQUOT. Once a write attempt is made 128 * the inode pointer is set to reference a dquot structure. 129 */ 130 #define NODQUOT ((struct dquot *) 0) 131 132 /* 133 * Flags to chkdq() and chkiq() 134 */ 135 #define FORCE 0x01 /* force usage changes independent of limits */ 136 #define CHOWN 0x02 /* (advisory) change initiated by chown */ 137 138 /* 139 * Macros to avoid subroutine calls to trivial functions. 140 */ 141 #ifndef DIAGNOSTIC 142 #define DQREF(dq) (dq)->dq_cnt++ 143 #else 144 #define DQREF(dq) dqref(dq) 145 #endif /* DIAGNOSTIC */ 146 147 #else 148 149 #include <sys/cdefs.h> 150 151 __BEGIN_DECLS 152 int quotactl __P((const char *, int, int, void *)); 153 __END_DECLS 154 155 #endif /* KERNEL */ 156 #endif /* _QUOTA_ */ 157