2 * Copyright (c) 1982, 1986 Regents of the University of California.
5 * This code is derived from software contributed to Berkeley by
6 * Robert Elz at The University of Melbourne.
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36 * Version: $Id: quota.h,v 1.1.1.1 2005/04/11 02:51:03 jack Exp $
42 #include <linux/errno.h>
45 * Convert diskblocks to blocks and the other way around.
47 #define dbtob(num) (num << BLOCK_SIZE_BITS)
48 #define btodb(num) (num >> BLOCK_SIZE_BITS)
51 * Convert count of filesystem blocks to diskquota blocks, meant
52 * for filesystems where i_blksize != BLOCK_SIZE
54 #define fs_to_dq_blocks(num, blksize) (((num) * (blksize)) / BLOCK_SIZE)
57 * Definitions for disk quotas imposed on the average user
58 * (big brother finally hits Linux).
60 * The following constants define the amount of time given a user
61 * before the soft limits are treated as hard limits (usually resulting
62 * in an allocation failure). The timer is started when the user crosses
63 * their soft limit, it is reset when they go below their soft limit.
65 #define MAX_IQ_TIME 604800 /* (7*24*60*60) 1 week */
66 #define MAX_DQ_TIME 604800 /* (7*24*60*60) 1 week */
69 #define USRQUOTA 0 /* element used for user quotas */
70 #define GRPQUOTA 1 /* element used for group quotas */
73 * Definitions for the default names of the quotas files.
75 #define INITQFNAMES { \
76 "user", /* USRQUOTA */ \
77 "group", /* GRPQUOTA */ \
81 #define QUOTAFILENAME "quota"
82 #define QUOTAGROUP "staff"
85 * Command definitions for the 'quotactl' system call.
86 * The commands are broken into a main command defined below
87 * and a subcommand that is used to convey the type of
88 * quota that is being manipulated (see above).
90 #define SUBCMDMASK 0x00ff
92 #define QCMD(cmd, type) (((cmd) << SUBCMDSHIFT) | ((type) & SUBCMDMASK))
94 #define Q_QUOTAON 0x0100 /* enable quotas */
95 #define Q_QUOTAOFF 0x0200 /* disable quotas */
96 #define Q_GETQUOTA 0x0300 /* get limits and usage */
97 #define Q_SETQUOTA 0x0400 /* set limits and usage */
98 #define Q_SETUSE 0x0500 /* set usage */
99 #define Q_SYNC 0x0600 /* sync disk copy of a filesystems quotas */
100 #define Q_SETQLIM 0x0700 /* set limits */
101 #define Q_GETSTATS 0x0800 /* get collected stats */
102 #define Q_RSQUASH 0x1000 /* set root_squash option */
105 * The following structure defines the format of the disk quota file
106 * (as it appears on disk) - the file is an array of these structures
107 * indexed by user or group number.
110 __u32 dqb_bhardlimit; /* absolute limit on disk blks alloc */
111 __u32 dqb_bsoftlimit; /* preferred limit on disk blks */
112 __u32 dqb_curblocks; /* current block count */
113 __u32 dqb_ihardlimit; /* absolute limit on allocated inodes */
114 __u32 dqb_isoftlimit; /* preferred inode limit */
115 __u32 dqb_curinodes; /* current # allocated inodes */
116 time_t dqb_btime; /* time limit for excessive disk use */
117 time_t dqb_itime; /* time limit for excessive inode use */
121 * Shorthand notation.
123 #define dq_bhardlimit dq_dqb.dqb_bhardlimit
124 #define dq_bsoftlimit dq_dqb.dqb_bsoftlimit
125 #define dq_curblocks dq_dqb.dqb_curblocks
126 #define dq_ihardlimit dq_dqb.dqb_ihardlimit
127 #define dq_isoftlimit dq_dqb.dqb_isoftlimit
128 #define dq_curinodes dq_dqb.dqb_curinodes
129 #define dq_btime dq_dqb.dqb_btime
130 #define dq_itime dq_dqb.dqb_itime
132 #define dqoff(UID) ((loff_t)((UID) * sizeof (struct dqblk)))
140 __u32 allocated_dquots;
147 extern int nr_dquots, nr_free_dquots;
148 extern int dquot_root_squash;
150 #define NR_DQHASH 43 /* Just an arbitrary number */
152 #define DQ_LOCKED 0x01 /* dquot under IO */
153 #define DQ_MOD 0x02 /* dquot modified since read */
154 #define DQ_BLKS 0x10 /* uid/gid has been warned about blk limit */
155 #define DQ_INODES 0x20 /* uid/gid has been warned about inode limit */
156 #define DQ_FAKE 0x40 /* no limits only usage */
157 #define DQ_INVAL 0x80 /* dquot is going to be invalidated */
160 struct list_head dq_hash; /* Hash list in memory */
161 struct list_head dq_inuse; /* List of all quotas */
162 struct list_head dq_free; /* Free list element */
163 wait_queue_head_t dq_wait_lock; /* Pointer to waitqueue on dquot lock */
164 wait_queue_head_t dq_wait_free; /* Pointer to waitqueue for quota to be unused */
165 int dq_count; /* Reference count */
167 /* fields after this point are cleared when invalidating */
168 struct super_block *dq_sb; /* superblock this applies to */
169 unsigned int dq_id; /* ID this applies to (uid, gid) */
170 kdev_t dq_dev; /* Device this applies to */
171 short dq_type; /* Type of quota */
172 short dq_flags; /* See DQ_* */
173 unsigned long dq_referenced; /* Number of times this dquot was
174 referenced during its lifetime */
175 struct dqblk dq_dqb; /* Diskquota usage */
178 #define NODQUOT (struct dquot *)NULL
181 * Flags used for set_dqblk.
183 #define SET_QUOTA 0x02
185 #define SET_QLIMIT 0x08
192 # /* nodep */ include <sys/cdefs.h>
195 long quotactl __P ((int, const char *, int, caddr_t));
198 #endif /* __KERNEL__ */