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1.1 root 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: * Redistribution is only permitted until one year after the first shipment
9: * of 4.4BSD by the Regents. Otherwise, redistribution and use in source and
10: * binary forms are permitted provided that: (1) source distributions retain
11: * this entire copyright notice and comment, and (2) distributions including
12: * binaries display the following acknowledgement: This product includes
13: * software developed by the University of California, Berkeley and its
14: * contributors'' in the documentation or other materials provided with the
15: * distribution and in all advertising materials mentioning features or use
16: * of this software. Neither the name of the University nor the names of
17: * its contributors may be used to endorse or promote products derived from
18: * this software without specific prior written permission.
19: * THIS SOFTWARE IS PROVIDED AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
20: * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
21: * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
22: *
23: * @(#)quota.h 7.6 (Berkeley) 6/28/90
24: */
25:
26: /*
27: * Definitions for disk quotas imposed on the average user
28: * (big brother finally hits UNIX).
29: *
30: * The following constants define the amount of time given a user
31: * before the soft limits are treated as hard limits (usually resulting
32: * in an allocation failure). The timer is started when the user crosses
33: * their soft limit, it is reset when they go below their soft limit.
34: */
35: #define MAX_IQ_TIME (7*24*60*60) /* 1 week */
36: #define MAX_DQ_TIME (7*24*60*60) /* 1 week */
37:
38: /*
39: * The following constants define the usage of the quota file array
40: * in the ufsmount structure and dquot array in the inode structure.
41: * The semantics of the elements of these arrays are defined in the
42: * routine getinoquota; the remainder of the quota code treats them
43: * generically and need not be inspected when changing the size of
44: * the array.
45: */
46: #define MAXQUOTAS 2
47: #define USRQUOTA 0 /* element used for user quotas */
48: #define GRPQUOTA 1 /* element used for group quotas */
49:
50: /*
51: * Definitions for the default names of the quotas files.
52: */
53: #define INITQFNAMES { \
54: "user", /* USRQUOTA */ \
55: "group", /* GRPQUOTA */ \
56: "undefined", \
57: };
58: #ifndef KERNEL
59: char *qfname = "quota";
60: char *qfextension[] = INITQFNAMES;
61: char *quotagroup = "operator";
62: #endif
63:
64: /*
65: * Command definitions for the 'quotactl' system call.
66: * The commands are broken into a main command defined below
67: * and a subcommand that is used to convey the type of
68: * quota that is being manipulated (see above).
69: */
70: #define SUBCMDMASK 0x00ff
71: #define SUBCMDSHIFT 8
72: #define QCMD(cmd, type) (((cmd) << SUBCMDSHIFT) | ((type) & SUBCMDMASK))
73:
74: #define Q_QUOTAON 0x0100 /* enable quotas */
75: #define Q_QUOTAOFF 0x0200 /* disable quotas */
76: #define Q_GETQUOTA 0x0300 /* get limits and usage */
77: #define Q_SETQUOTA 0x0400 /* set limits and usage */
78: #define Q_SETUSE 0x0500 /* set usage */
79: #define Q_SYNC 0x0600 /* sync disk copy of a filesystems quotas */
80:
81: /*
82: * The following structure defines the format of the disk quota file
83: * (as it appears on disk) - the file is an array of these structures
84: * indexed by user or group number. The setquota system call establishes
85: * the vnode for each quota file (a pointer is retained in the ufsmount
86: * structure).
87: */
88: struct dqblk {
89: u_long dqb_bhardlimit; /* absolute limit on disk blks alloc */
90: u_long dqb_bsoftlimit; /* preferred limit on disk blks */
91: u_long dqb_curblocks; /* current block count */
92: u_long dqb_ihardlimit; /* maximum # allocated inodes + 1 */
93: u_long dqb_isoftlimit; /* preferred inode limit */
94: u_long dqb_curinodes; /* current # allocated inodes */
95: time_t dqb_btime; /* time limit for excessive disk use */
96: time_t dqb_itime; /* time limit for excessive files */
97: };
98:
99: #ifdef KERNEL
100: /*
101: * The following structure records disk usage for a user or group on a
102: * filesystem. There is one allocated for each quota that exists on any
103: * filesystem for the current user or group. A cache is kept of recently
104: * used entries.
105: */
106: struct dquot {
107: struct dquot *dq_forw, *dq_back;/* MUST be first entry */
108: struct dquot *dq_freef, **dq_freeb; /* free list */
109: short dq_flags; /* flags, see below */
110: short dq_cnt; /* count of active references */
111: short dq_spare; /* unused spare padding */
112: short dq_type; /* quota type of this dquot */
113: u_long dq_id; /* identifier this applies to */
114: struct ufsmount *dq_ump; /* filesystem that this is taken from */
115: struct dqblk dq_dqb; /* actual usage & quotas */
116: };
117: /*
118: * Flag values.
119: */
120: #define DQ_LOCK 0x01 /* this quota locked (no MODS) */
121: #define DQ_WANT 0x02 /* wakeup on unlock */
122: #define DQ_MOD 0x04 /* this quota modified since read */
123: #define DQ_FAKE 0x08 /* no limits here, just usage */
124: #define DQ_BLKS 0x10 /* has been warned about blk limit */
125: #define DQ_INODS 0x20 /* has been warned about inode limit */
126: /*
127: * Shorthand notation.
128: */
129: #define dq_bhardlimit dq_dqb.dqb_bhardlimit
130: #define dq_bsoftlimit dq_dqb.dqb_bsoftlimit
131: #define dq_curblocks dq_dqb.dqb_curblocks
132: #define dq_ihardlimit dq_dqb.dqb_ihardlimit
133: #define dq_isoftlimit dq_dqb.dqb_isoftlimit
134: #define dq_curinodes dq_dqb.dqb_curinodes
135: #define dq_btime dq_dqb.dqb_btime
136: #define dq_itime dq_dqb.dqb_itime
137:
138: /*
139: * If the system has never checked for a quota for this file,
140: * then it is set to NODQUOT. Once a write attempt is made
141: * the inode pointer is set to reference a dquot structure.
142: */
143: #define NODQUOT ((struct dquot *) 0)
144:
145: /*
146: * Flags to chkdq() and chkiq()
147: */
148: #define FORCE 0x01 /* force usage changes independent of limits */
149: #define CHOWN 0x02 /* (advisory) change initiated by chown */
150:
151: /*
152: * Macros to avoid subroutine calls to trivial functions.
153: */
154: #ifndef DIAGNOSTIC
155: #define DQREF(dq) (dq)->dq_cnt++
156: #else
157: #define DQREF(dq) dqref(dq)
158: #endif /* DIAGNOSTIC */
159: #endif /* KERNEL */
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