1 /* quota.h 6.1 83/07/29 */ 2 3 /* 4 * MELBOURNE DISC QUOTAS 5 * 6 * Various junk to do with various quotas (etc) imposed upon 7 * the average user (big brother finally hits UNIX). 8 * 9 * The following structure exists in core for each logged on user. 10 * It contains global junk relevant to that user's quotas. 11 * 12 * The u_quota field of each user struct contains a pointer to 13 * the quota struct relevant to the current process, this is changed 14 * by 'setuid' sys call, &/or by the Q_SETUID quota() call. 15 */ 16 struct quota { 17 struct quota *q_forw, *q_back; /* hash chain, MUST be first */ 18 short q_cnt; /* ref count (# processes) */ 19 short q_uid; /* real uid of owner */ 20 int q_flags; /* struct management flags */ 21 #define Q_LOCK 0x01 /* quota struct locked (for disc i/o) */ 22 #define Q_WANT 0x02 /* issue a wakeup when lock goes off */ 23 #define Q_NEW 0x04 /* new quota - no proc1 msg sent yet */ 24 #define Q_NDQ 0x08 /* account has NO disc quota */ 25 struct quota *q_freef, **q_freeb; 26 struct dquot *q_dq[NMOUNT]; /* disc quotas for mounted filesys's */ 27 }; 28 29 #define NOQUOTA ((struct quota *) 0) 30 31 #if defined(KERNEL) && defined(QUOTA) 32 struct quota *quota, *quotaNQUOTA; 33 int nquota; 34 struct quota *getquota(), *qfind(); 35 #endif 36 37 /* 38 * The following structure defines the format of the disc quota file 39 * (as it appears on disc) - the file is an array of these structures 40 * indexed by user number. The setquota sys call establishes the inode 41 * for each quota file (a pointer is retained in the mount structure). 42 * 43 * The following constants define the number of warnings given a user 44 * before the soft limits are treated as hard limits (usually resulting 45 * in an allocation failure). The warnings are normally manipulated 46 * each time a user logs in through the Q_DOWARN quota call. If 47 * the user logs in and is under the soft limit the warning count 48 * is reset to MAX_*_WARN, otherwise a message is printed and the 49 * warning count is decremented. This makes MAX_*_WARN equivalent to 50 * the number of logins before soft limits are treated as hard limits. 51 */ 52 #define MAX_IQ_WARN 3 53 #define MAX_DQ_WARN 3 54 55 struct dqblk { 56 u_long dqb_bhardlimit; /* absolute limit on disc blks alloc */ 57 u_long dqb_bsoftlimit; /* preferred limit on disc blks */ 58 u_long dqb_curblocks; /* current block count */ 59 u_short dqb_ihardlimit; /* maximum # allocated inodes + 1 */ 60 u_short dqb_isoftlimit; /* preferred inode limit */ 61 u_short dqb_curinodes; /* current # allocated inodes */ 62 u_char dqb_bwarn; /* # warnings left about excessive disc use */ 63 u_char dqb_iwarn; /* # warnings left about excessive inodes */ 64 }; 65 66 /* 67 * The following structure records disc usage for a user on a filesystem. 68 * There is one allocated for each quota that exists on any filesystem 69 * for the current user. A cache is kept of other recently used entries. 70 */ 71 struct dquot { 72 struct dquot *dq_forw, *dq_back;/* MUST be first entry */ 73 union { 74 struct quota *Dq_own; /* the quota that points to this */ 75 struct { /* free list */ 76 struct dquot *Dq_freef, **Dq_freeb; 77 } dq_f; 78 } dq_u; 79 short dq_flags; 80 #define DQ_LOCK 0x01 /* this quota locked (no MODS) */ 81 #define DQ_WANT 0x02 /* wakeup on unlock */ 82 #define DQ_MOD 0x04 /* this quota modified since read */ 83 #define DQ_FAKE 0x08 /* no limits here, just usage */ 84 #define DQ_BLKS 0x10 /* has been warned about blk limit */ 85 #define DQ_INODS 0x20 /* has been warned about inode limit */ 86 short dq_cnt; /* count of active references */ 87 short dq_uid; /* user this applies to */ 88 dev_t dq_dev; /* filesystem this relates to */ 89 struct dqblk dq_dqb; /* actual usage & quotas */ 90 }; 91 92 #define dq_own dq_u.Dq_own 93 #define dq_freef dq_u.dq_f.Dq_freef 94 #define dq_freeb dq_u.dq_f.Dq_freeb 95 #define dq_bhardlimit dq_dqb.dqb_bhardlimit 96 #define dq_bsoftlimit dq_dqb.dqb_bsoftlimit 97 #define dq_curblocks dq_dqb.dqb_curblocks 98 #define dq_ihardlimit dq_dqb.dqb_ihardlimit 99 #define dq_isoftlimit dq_dqb.dqb_isoftlimit 100 #define dq_curinodes dq_dqb.dqb_curinodes 101 #define dq_bwarn dq_dqb.dqb_bwarn 102 #define dq_iwarn dq_dqb.dqb_iwarn 103 104 #define NODQUOT ((struct dquot *) 0) 105 #define LOSTDQUOT ((struct dquot *) 1) 106 107 #if defined(KERNEL) && defined(QUOTA) 108 struct dquot *dquot, *dquotNDQUOT; 109 int ndquot; 110 struct dquot *discquota(), *inoquota(), *dqalloc(), *dqp(); 111 #endif 112 113 /* 114 * Definitions for the 'quota' system call. 115 */ 116 #define Q_SETDLIM 1 /* set disc limits & usage */ 117 #define Q_GETDLIM 2 /* get disc limits & usage */ 118 #define Q_SETDUSE 3 /* set disc usage only */ 119 #define Q_SYNC 4 /* update disc copy of quota usages */ 120 #define Q_SETUID 16 /* change proc to use quotas for uid */ 121 #define Q_SETWARN 25 /* alter inode/block warning counts */ 122 #define Q_DOWARN 26 /* warn user about excessive space/inodes */ 123 124 /* 125 * Used in Q_SETDUSE. 126 */ 127 struct dqusage { 128 u_short du_curinodes; 129 u_long du_curblocks; 130 }; 131 132 /* 133 * Used in Q_SETWARN. 134 */ 135 struct dqwarn { 136 u_char dw_bwarn; 137 u_char dw_iwarn; 138 }; 139