FreeBSD/Linux Kernel Cross Reference
sys/ufs/ufs/quota.h

     /*-
      * Copyright (c) 1982, 1986, 1993
      *      The Regents of the University of California.  All rights reserved.
      *
      * This code is derived from software contributed to Berkeley by
      * Robert Elz at The University of Melbourne.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 4. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      @(#)quota.h     8.3 (Berkeley) 8/19/94
     * $FreeBSD$
     */
    
    #ifndef _UFS_UFS_QUOTA_H_
    #define _UFS_UFS_QUOTA_H_
    
    /*
     * Definitions for disk quotas imposed on the average user
     * (big brother finally hits UNIX).
     *
     * The following constants define the amount of time given a user before the
     * soft limits are treated as hard limits (usually resulting in an allocation
     * failure). The timer is started when the user crosses their soft limit, it
     * is reset when they go below their soft limit.
     */
    #define MAX_IQ_TIME     (7*24*60*60)    /* seconds in 1 week */
    #define MAX_DQ_TIME     (7*24*60*60)    /* seconds in 1 week */
    
    /*
     * The following constants define the usage of the quota file array in the
     * ufsmount structure and dquot array in the inode structure.  The semantics
     * of the elements of these arrays are defined in the routine getinoquota;
     * the remainder of the quota code treats them generically and need not be
     * inspected when changing the size of the array.
     */
    #define MAXQUOTAS       2
    #define USRQUOTA        0       /* element used for user quotas */
    #define GRPQUOTA        1       /* element used for group quotas */
    
    /*
     * Definitions for the default names of the quotas files.
     */
    #define INITQFNAMES { \
            "user",         /* USRQUOTA */ \
            "group",        /* GRPQUOTA */ \
            "undefined", \
    }
    #define QUOTAFILENAME   "quota"
    #define QUOTAGROUP      "operator"
    
    /*
     * Command definitions for the 'quotactl' system call.  The commands are
     * broken into a main command defined below and a subcommand that is used
     * to convey the type of quota that is being manipulated (see above).
     */
    #define SUBCMDMASK      0x00ff
    #define SUBCMDSHIFT     8
    #define QCMD(cmd, type) (((cmd) << SUBCMDSHIFT) | ((type) & SUBCMDMASK))
    
    #define Q_QUOTAON       0x0100  /* enable quotas */
    #define Q_QUOTAOFF      0x0200  /* disable quotas */
    #define Q_GETQUOTA      0x0300  /* get limits and usage */
    #define Q_SETQUOTA      0x0400  /* set limits and usage */
    #define Q_SETUSE        0x0500  /* set usage */
    #define Q_SYNC          0x0600  /* sync disk copy of a filesystems quotas */
    
    /*
     * The following structure defines the format of the disk quota file
     * (as it appears on disk) - the file is an array of these structures
     * indexed by user or group number.  The setquota system call establishes
     * the vnode for each quota file (a pointer is retained in the ufsmount
     * structure).
     */
    struct dqblk {
            u_int32_t dqb_bhardlimit;       /* absolute limit on disk blks alloc */
            u_int32_t dqb_bsoftlimit;       /* preferred limit on disk blks */
            u_int32_t dqb_curblocks;        /* current block count */
           u_int32_t dqb_ihardlimit;       /* maximum # allocated inodes + 1 */
           u_int32_t dqb_isoftlimit;       /* preferred inode limit */
           u_int32_t dqb_curinodes;        /* current # allocated inodes */
           int32_t   dqb_btime;            /* time limit for excessive disk use */
           int32_t   dqb_itime;            /* time limit for excessive files */
   };
   
   #ifdef _KERNEL
   
   #include <sys/queue.h>
   
   /*
    * The following structure records disk usage for a user or group on a
    * filesystem. There is one allocated for each quota that exists on any
    * filesystem for the current user or group. A cache is kept of recently
    * used entries.
    * (h) protected by dqhlock
    */
   struct dquot {
           LIST_ENTRY(dquot) dq_hash;      /* (h) hash list */
           TAILQ_ENTRY(dquot) dq_freelist; /* (h) free list */
           struct mtx dq_lock;             /* lock for concurrency */
           u_int16_t dq_flags;             /* flags, see below */
           u_int16_t dq_type;              /* quota type of this dquot */
           u_int32_t dq_cnt;               /* (h) count of active references */
           u_int32_t dq_id;                /* identifier this applies to */
           struct  ufsmount *dq_ump;       /* (h) filesystem that this is
                                              taken from */
           struct  dqblk dq_dqb;           /* actual usage & quotas */
   };
   /*
    * Flag values.
    */
   #define DQ_LOCK         0x01            /* this quota locked (no MODS) */
   #define DQ_WANT         0x02            /* wakeup on unlock */
   #define DQ_MOD          0x04            /* this quota modified since read */
   #define DQ_FAKE         0x08            /* no limits here, just usage */
   #define DQ_BLKS         0x10            /* has been warned about blk limit */
   #define DQ_INODS        0x20            /* has been warned about inode limit */
   /*
    * Shorthand notation.
    */
   #define dq_bhardlimit   dq_dqb.dqb_bhardlimit
   #define dq_bsoftlimit   dq_dqb.dqb_bsoftlimit
   #define dq_curblocks    dq_dqb.dqb_curblocks
   #define dq_ihardlimit   dq_dqb.dqb_ihardlimit
   #define dq_isoftlimit   dq_dqb.dqb_isoftlimit
   #define dq_curinodes    dq_dqb.dqb_curinodes
   #define dq_btime        dq_dqb.dqb_btime
   #define dq_itime        dq_dqb.dqb_itime
   
   /*
    * If the system has never checked for a quota for this file, then it is
    * set to NODQUOT.  Once a write attempt is made the inode pointer is set
    * to reference a dquot structure.
    */
   #define NODQUOT         NULL
   
   /*
    * Flags to chkdq() and chkiq()
    */
   #define FORCE   0x01    /* force usage changes independent of limits */
   #define CHOWN   0x02    /* (advisory) change initiated by chown */
   
   /*
    * Macros to avoid subroutine calls to trivial functions.
    */
   #ifdef DIAGNOSTIC
   #define DQREF(dq)       dqref(dq)
   #else
   #define DQREF(dq)       (dq)->dq_cnt++
   #endif
   
   #define DQI_LOCK(dq)    mtx_lock(&(dq)->dq_lock)
   #define DQI_UNLOCK(dq)  mtx_unlock(&(dq)->dq_lock)
   
   #define DQI_WAIT(dq, prio, msg) do {            \
           while ((dq)->dq_flags & DQ_LOCK) {      \
                   (dq)->dq_flags |= DQ_WANT;      \
                   (void) msleep((dq),             \
                       &(dq)->dq_lock, (prio), (msg), 0); \
           }                                       \
   } while (0)
   
   #define DQI_WAKEUP(dq) do {                     \
           if ((dq)->dq_flags & DQ_WANT)           \
                   wakeup((dq));                   \
           (dq)->dq_flags &= ~(DQ_WANT|DQ_LOCK);   \
   } while (0)
   
   struct inode;
   struct mount;
   struct thread;
   struct ucred;
   struct vnode;
   
   int     chkdq(struct inode *, int64_t, struct ucred *, int);
   int     chkiq(struct inode *, int, struct ucred *, int);
   void    dqinit(void);
   void    dqrele(struct vnode *, struct dquot *);
   void    dquninit(void);
   int     getinoquota(struct inode *);
   int     getquota(struct thread *, struct mount *, u_long, int, void *);
   int     qsync(struct mount *mp);
   int     quotaoff(struct thread *td, struct mount *, int);
   int     quotaon(struct thread *td, struct mount *, int, void *);
   int     setquota(struct thread *, struct mount *, u_long, int, void *);
   int     setuse(struct thread *, struct mount *, u_long, int, void *);
   vfs_quotactl_t ufs_quotactl;
   
   #else /* !_KERNEL */
   
   #include <sys/cdefs.h>
   
   __BEGIN_DECLS
   int     quotactl(const char *, int, int, void *);
   __END_DECLS
   
   #endif /* _KERNEL */
   
   #endif /* !_UFS_UFS_QUOTA_H_ */

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