release/src-rt-6.x.4708/linux/linux-2.6.36/fs/xfs/quota/xfs_qm.h

   1 /*
   2  * Copyright (c) 2000-2005 Silicon Graphics, Inc.
   3  * All Rights Reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it would be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write the Free Software Foundation,
  16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18 #ifndef __XFS_QM_H__
  19 #define __XFS_QM_H__
  20
  21 #include "xfs_dquot_item.h"
  22 #include "xfs_dquot.h"
  23 #include "xfs_quota_priv.h"
  24 #include "xfs_qm_stats.h"
  25
  26 struct xfs_qm;
  27 struct xfs_inode;
  28
  29 extern uint             ndquot;
  30 extern struct mutex     xfs_Gqm_lock;
  31 extern struct xfs_qm    *xfs_Gqm;
  32 extern kmem_zone_t      *qm_dqzone;
  33 extern kmem_zone_t      *qm_dqtrxzone;
  34
  35 /*
  36  * Used in xfs_qm_sync called by xfs_sync to count the max times that it can
  37  * iterate over the mountpt's dquot list in one call.
  38  */
  39 #define XFS_QM_SYNC_MAX_RESTARTS        7
  40
  41 /*
  42  * Ditto, for xfs_qm_dqreclaim_one.
  43  */
  44 #define XFS_QM_RECLAIM_MAX_RESTARTS     4
  45
  46 /*
  47  * Ideal ratio of free to in use dquots. Quota manager makes an attempt
  48  * to keep this balance.
  49  */
  50 #define XFS_QM_DQFREE_RATIO             2
  51
  52 /*
  53  * Dquot hashtable constants/threshold values.
  54  */
  55 #define XFS_QM_HASHSIZE_LOW             (PAGE_SIZE / sizeof(xfs_dqhash_t))
  56 #define XFS_QM_HASHSIZE_HIGH            ((PAGE_SIZE * 4) / sizeof(xfs_dqhash_t))
  57
  58 /*
  59  * This defines the unit of allocation of dquots.
  60  * Currently, it is just one file system block, and a 4K blk contains 30
  61  * (136 * 30 = 4080) dquots. It's probably not worth trying to make
  62  * this more dynamic.
  63  * XXXsup However, if this number is changed, we have to make sure that we don't
  64  * implicitly assume that we do allocations in chunks of a single filesystem
  65  * block in the dquot/xqm code.
  66  */
  67 #define XFS_DQUOT_CLUSTER_SIZE_FSB      (xfs_filblks_t)1
  68 /*
  69  * When doing a quotacheck, we log dquot clusters of this many FSBs at most
  70  * in a single transaction. We don't want to ask for too huge a log reservation.
  71  */
  72 #define XFS_QM_MAX_DQCLUSTER_LOGSZ      3
  73
  74 typedef xfs_dqhash_t    xfs_dqlist_t;
  75
  76 /*
  77  * Quota Manager (global) structure. Lives only in core.
  78  */
  79 typedef struct xfs_qm {
  80         xfs_dqlist_t    *qm_usr_dqhtable;/* udquot hash table */
  81         xfs_dqlist_t    *qm_grp_dqhtable;/* gdquot hash table */
  82         uint             qm_dqhashmask;  /* # buckets in dq hashtab - 1 */
  83         struct list_head qm_dqfrlist;    /* freelist of dquots */
  84         struct mutex     qm_dqfrlist_lock;
  85         int              qm_dqfrlist_cnt;
  86         atomic_t         qm_totaldquots; /* total incore dquots */
  87         uint             qm_nrefs;       /* file systems with quota on */
  88         int              qm_dqfree_ratio;/* ratio of free to inuse dquots */
  89         kmem_zone_t     *qm_dqzone;      /* dquot mem-alloc zone */
  90         kmem_zone_t     *qm_dqtrxzone;   /* t_dqinfo of transactions */
  91 } xfs_qm_t;
  92
  93 /*
  94  * Various quota information for individual filesystems.
  95  * The mount structure keeps a pointer to this.
  96  */
  97 typedef struct xfs_quotainfo {
  98         xfs_inode_t     *qi_uquotaip;    /* user quota inode */
  99         xfs_inode_t     *qi_gquotaip;    /* group quota inode */
 100         struct list_head qi_dqlist;      /* all dquots in filesys */
 101         struct mutex     qi_dqlist_lock;
 102         int              qi_dquots;
 103         int              qi_dqreclaims;  /* a change here indicates
 104                                             a removal in the dqlist */
 105         time_t           qi_btimelimit;  /* limit for blks timer */
 106         time_t           qi_itimelimit;  /* limit for inodes timer */
 107         time_t           qi_rtbtimelimit;/* limit for rt blks timer */
 108         xfs_qwarncnt_t   qi_bwarnlimit;  /* limit for blks warnings */
 109         xfs_qwarncnt_t   qi_iwarnlimit;  /* limit for inodes warnings */
 110         xfs_qwarncnt_t   qi_rtbwarnlimit;/* limit for rt blks warnings */
 111         struct mutex     qi_quotaofflock;/* to serialize quotaoff */
 112         xfs_filblks_t    qi_dqchunklen;  /* # BBs in a chunk of dqs */
 113         uint             qi_dqperchunk;  /* # ondisk dqs in above chunk */
 114         xfs_qcnt_t       qi_bhardlimit;  /* default data blk hard limit */
 115         xfs_qcnt_t       qi_bsoftlimit;  /* default data blk soft limit */
 116         xfs_qcnt_t       qi_ihardlimit;  /* default inode count hard limit */
 117         xfs_qcnt_t       qi_isoftlimit;  /* default inode count soft limit */
 118         xfs_qcnt_t       qi_rtbhardlimit;/* default realtime blk hard limit */
 119         xfs_qcnt_t       qi_rtbsoftlimit;/* default realtime blk soft limit */
 120 } xfs_quotainfo_t;
 121
 122
 123 extern void     xfs_trans_mod_dquot(xfs_trans_t *, xfs_dquot_t *, uint, long);
 124 extern int      xfs_trans_reserve_quota_bydquots(xfs_trans_t *, xfs_mount_t *,
 125                         xfs_dquot_t *, xfs_dquot_t *, long, long, uint);
 126 extern void     xfs_trans_dqjoin(xfs_trans_t *, xfs_dquot_t *);
 127 extern void     xfs_trans_log_dquot(xfs_trans_t *, xfs_dquot_t *);
 128
 129 /*
 130  * We keep the usr and grp dquots separately so that locking will be easier
 131  * to do at commit time. All transactions that we know of at this point
 132  * affect no more than two dquots of one type. Hence, the TRANS_MAXDQS value.
 133  */
 134 #define XFS_QM_TRANS_MAXDQS             2
 135 typedef struct xfs_dquot_acct {
 136         xfs_dqtrx_t     dqa_usrdquots[XFS_QM_TRANS_MAXDQS];
 137         xfs_dqtrx_t     dqa_grpdquots[XFS_QM_TRANS_MAXDQS];
 138 } xfs_dquot_acct_t;
 139
 140 /*
 141  * Users are allowed to have a usage exceeding their softlimit for
 142  * a period this long.
 143  */
 144 #define XFS_QM_BTIMELIMIT       (7 * 24*60*60)          /* 1 week */
 145 #define XFS_QM_RTBTIMELIMIT     (7 * 24*60*60)          /* 1 week */
 146 #define XFS_QM_ITIMELIMIT       (7 * 24*60*60)          /* 1 week */
 147
 148 #define XFS_QM_BWARNLIMIT       5
 149 #define XFS_QM_IWARNLIMIT       5
 150 #define XFS_QM_RTBWARNLIMIT     5
 151
 152 extern void             xfs_qm_destroy_quotainfo(xfs_mount_t *);
 153 extern int              xfs_qm_quotacheck(xfs_mount_t *);
 154 extern int              xfs_qm_write_sb_changes(xfs_mount_t *, __int64_t);
 155
 156 /* dquot stuff */
 157 extern boolean_t        xfs_qm_dqalloc_incore(xfs_dquot_t **);
 158 extern int              xfs_qm_dqpurge_all(xfs_mount_t *, uint);
 159 extern void             xfs_qm_dqrele_all_inodes(xfs_mount_t *, uint);
 160
 161 /* quota ops */
 162 extern int              xfs_qm_scall_trunc_qfiles(xfs_mount_t *, uint);
 163 extern int              xfs_qm_scall_getquota(xfs_mount_t *, xfs_dqid_t, uint,
 164                                         fs_disk_quota_t *);
 165 extern int              xfs_qm_scall_setqlim(xfs_mount_t *, xfs_dqid_t, uint,
 166                                         fs_disk_quota_t *);
 167 extern int              xfs_qm_scall_getqstat(xfs_mount_t *, fs_quota_stat_t *);
 168 extern int              xfs_qm_scall_quotaon(xfs_mount_t *, uint);
 169 extern int              xfs_qm_scall_quotaoff(xfs_mount_t *, uint);
 170
 171 #ifdef DEBUG
 172 extern int              xfs_qm_internalqcheck(xfs_mount_t *);
 173 #else
 174 #define xfs_qm_internalqcheck(mp)       (0)
 175 #endif
 176
 177 #endif /* __XFS_QM_H__ */