fs/xfs/quota/xfs_qm_bhv.c

   1 /*
   2  * Copyright (c) 2000-2006 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 #include "xfs.h"
  19 #include "xfs_fs.h"
  20 #include "xfs_bit.h"
  21 #include "xfs_log.h"
  22 #include "xfs_inum.h"
  23 #include "xfs_clnt.h"
  24 #include "xfs_trans.h"
  25 #include "xfs_sb.h"
  26 #include "xfs_ag.h"
  27 #include "xfs_dir2.h"
  28 #include "xfs_alloc.h"
  29 #include "xfs_dmapi.h"
  30 #include "xfs_quota.h"
  31 #include "xfs_mount.h"
  32 #include "xfs_bmap_btree.h"
  33 #include "xfs_alloc_btree.h"
  34 #include "xfs_ialloc_btree.h"
  35 #include "xfs_dir2_sf.h"
  36 #include "xfs_attr_sf.h"
  37 #include "xfs_dinode.h"
  38 #include "xfs_inode.h"
  39 #include "xfs_ialloc.h"
  40 #include "xfs_itable.h"
  41 #include "xfs_btree.h"
  42 #include "xfs_bmap.h"
  43 #include "xfs_rtalloc.h"
  44 #include "xfs_error.h"
  45 #include "xfs_rw.h"
  46 #include "xfs_acl.h"
  47 #include "xfs_attr.h"
  48 #include "xfs_buf_item.h"
  49 #include "xfs_qm.h"
  50
  51
  52 STATIC void
  53 xfs_fill_statvfs_from_dquot(
  54         bhv_statvfs_t           *statp,
  55         xfs_disk_dquot_t        *dp)
  56 {
  57         __uint64_t              limit;
  58
  59         limit = dp->d_blk_softlimit ?
  60                 be64_to_cpu(dp->d_blk_softlimit) :
  61                 be64_to_cpu(dp->d_blk_hardlimit);
  62         if (limit && statp->f_blocks > limit) {
  63                 statp->f_blocks = limit;
  64                 statp->f_bfree =
  65                         (statp->f_blocks > be64_to_cpu(dp->d_bcount)) ?
  66                          (statp->f_blocks - be64_to_cpu(dp->d_bcount)) : 0;
  67         }
  68
  69         limit = dp->d_ino_softlimit ?
  70                 be64_to_cpu(dp->d_ino_softlimit) :
  71                 be64_to_cpu(dp->d_ino_hardlimit);
  72         if (limit && statp->f_files > limit) {
  73                 statp->f_files = limit;
  74                 statp->f_ffree =
  75                         (statp->f_files > be64_to_cpu(dp->d_icount)) ?
  76                          (statp->f_ffree - be64_to_cpu(dp->d_icount)) : 0;
  77         }
  78 }
  79
  80
  81 /*
  82  * Directory tree accounting is implemented using project quotas, where
  83  * the project identifier is inherited from parent directories.
  84  * A statvfs (df, etc.) of a directory that is using project quota should
  85  * return a statvfs of the project, not the entire filesystem.
  86  * This makes such trees appear as if they are filesystems in themselves.
  87  */
  88 STATIC void
  89 xfs_qm_statvfs(
  90         xfs_inode_t             *ip,
  91         bhv_statvfs_t           *statp)
  92 {
  93         xfs_mount_t             *mp = ip->i_mount;
  94         xfs_dquot_t             *dqp;
  95
  96         if (!(ip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) ||
  97             !((mp->m_qflags & (XFS_PQUOTA_ACCT|XFS_OQUOTA_ENFD))) ==
  98                               (XFS_PQUOTA_ACCT|XFS_OQUOTA_ENFD))
  99                 return;
 100
 101         if (!xfs_qm_dqget(mp, NULL, ip->i_d.di_projid, XFS_DQ_PROJ, 0, &dqp)) {
 102                 xfs_disk_dquot_t        *dp = &dqp->q_core;
 103
 104                 xfs_fill_statvfs_from_dquot(statp, dp);
 105                 xfs_qm_dqput(dqp);
 106         }
 107 }
 108
 109 STATIC int
 110 xfs_qm_newmount(
 111         xfs_mount_t     *mp,
 112         uint            *needquotamount,
 113         uint            *quotaflags)
 114 {
 115         uint            quotaondisk;
 116         uint            uquotaondisk = 0, gquotaondisk = 0, pquotaondisk = 0;
 117
 118         *quotaflags = 0;
 119         *needquotamount = B_FALSE;
 120
 121         quotaondisk = xfs_sb_version_hasquota(&mp->m_sb) &&
 122                                 (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_ACCT);
 123
 124         if (quotaondisk) {
 125                 uquotaondisk = mp->m_sb.sb_qflags & XFS_UQUOTA_ACCT;
 126                 pquotaondisk = mp->m_sb.sb_qflags & XFS_PQUOTA_ACCT;
 127                 gquotaondisk = mp->m_sb.sb_qflags & XFS_GQUOTA_ACCT;
 128         }
 129
 130         /*
 131          * If the device itself is read-only, we can't allow
 132          * the user to change the state of quota on the mount -
 133          * this would generate a transaction on the ro device,
 134          * which would lead to an I/O error and shutdown
 135          */
 136
 137         if (((uquotaondisk && !XFS_IS_UQUOTA_ON(mp)) ||
 138             (!uquotaondisk &&  XFS_IS_UQUOTA_ON(mp)) ||
 139              (pquotaondisk && !XFS_IS_PQUOTA_ON(mp)) ||
 140             (!pquotaondisk &&  XFS_IS_PQUOTA_ON(mp)) ||
 141              (gquotaondisk && !XFS_IS_GQUOTA_ON(mp)) ||
 142             (!gquotaondisk &&  XFS_IS_OQUOTA_ON(mp)))  &&
 143             xfs_dev_is_read_only(mp, "changing quota state")) {
 144                 cmn_err(CE_WARN,
 145                         "XFS: please mount with%s%s%s%s.",
 146                         (!quotaondisk ? "out quota" : ""),
 147                         (uquotaondisk ? " usrquota" : ""),
 148                         (pquotaondisk ? " prjquota" : ""),
 149                         (gquotaondisk ? " grpquota" : ""));
 150                 return XFS_ERROR(EPERM);
 151         }
 152
 153         if (XFS_IS_QUOTA_ON(mp) || quotaondisk) {
 154                 /*
 155                  * Call mount_quotas at this point only if we won't have to do
 156                  * a quotacheck.
 157                  */
 158                 if (quotaondisk && !XFS_QM_NEED_QUOTACHECK(mp)) {
 159                         /*
 160                          * If an error occured, qm_mount_quotas code
 161                          * has already disabled quotas. So, just finish
 162                          * mounting, and get on with the boring life
 163                          * without disk quotas.
 164                          */
 165                         xfs_qm_mount_quotas(mp);
 166                 } else {
 167                         /*
 168                          * Clear the quota flags, but remember them. This
 169                          * is so that the quota code doesn't get invoked
 170                          * before we're ready. This can happen when an
 171                          * inode goes inactive and wants to free blocks,
 172                          * or via xfs_log_mount_finish.
 173                          */
 174                         *needquotamount = B_TRUE;
 175                         *quotaflags = mp->m_qflags;
 176                         mp->m_qflags = 0;
 177                 }
 178         }
 179
 180         return 0;
 181 }
 182
 183 STATIC int
 184 xfs_qm_endmount(
 185         xfs_mount_t     *mp,
 186         uint            needquotamount,
 187         uint            quotaflags)
 188 {
 189         if (needquotamount) {
 190                 ASSERT(mp->m_qflags == 0);
 191                 mp->m_qflags = quotaflags;
 192                 xfs_qm_mount_quotas(mp);
 193         }
 194
 195 #if defined(DEBUG) && defined(XFS_LOUD_RECOVERY)
 196         if (! (XFS_IS_QUOTA_ON(mp)))
 197                 xfs_fs_cmn_err(CE_NOTE, mp, "Disk quotas not turned on");
 198         else
 199                 xfs_fs_cmn_err(CE_NOTE, mp, "Disk quotas turned on");
 200 #endif
 201
 202 #ifdef QUOTADEBUG
 203         if (XFS_IS_QUOTA_ON(mp) && xfs_qm_internalqcheck(mp))
 204                 cmn_err(CE_WARN, "XFS: mount internalqcheck failed");
 205 #endif
 206
 207         return 0;
 208 }
 209
 210 STATIC void
 211 xfs_qm_dqrele_null(
 212         xfs_dquot_t     *dq)
 213 {
 214         /*
 215          * Called from XFS, where we always check first for a NULL dquot.
 216          */
 217         if (!dq)
 218                 return;
 219         xfs_qm_dqrele(dq);
 220 }
 221
 222
 223 struct xfs_qmops xfs_qmcore_xfs = {
 224         .xfs_qminit             = xfs_qm_newmount,
 225         .xfs_qmdone             = xfs_qm_unmount_quotadestroy,
 226         .xfs_qmmount            = xfs_qm_endmount,
 227         .xfs_qmunmount          = xfs_qm_unmount_quotas,
 228         .xfs_dqrele             = xfs_qm_dqrele_null,
 229         .xfs_dqattach           = xfs_qm_dqattach,
 230         .xfs_dqdetach           = xfs_qm_dqdetach,
 231         .xfs_dqpurgeall         = xfs_qm_dqpurge_all,
 232         .xfs_dqvopalloc         = xfs_qm_vop_dqalloc,
 233         .xfs_dqvopcreate        = xfs_qm_vop_dqattach_and_dqmod_newinode,
 234         .xfs_dqvoprename        = xfs_qm_vop_rename_dqattach,
 235         .xfs_dqvopchown         = xfs_qm_vop_chown,
 236         .xfs_dqvopchownresv     = xfs_qm_vop_chown_reserve,
 237         .xfs_dqstatvfs          = xfs_qm_statvfs,
 238         .xfs_dqsync             = xfs_qm_sync,
 239         .xfs_quotactl           = xfs_qm_quotactl,
 240         .xfs_dqtrxops           = &xfs_trans_dquot_ops,
 241 };
 242 EXPORT_SYMBOL(xfs_qmcore_xfs);
 243
 244 void __init
 245 xfs_qm_init(void)
 246 {
 247         printk(KERN_INFO "SGI XFS Quota Management subsystem\n");
 248         mutex_init(&xfs_Gqm_lock);
 249         xfs_qm_init_procfs();
 250 }
 251
 252 void __exit
 253 xfs_qm_exit(void)
 254 {
 255         xfs_qm_cleanup_procfs();
 256         if (qm_dqzone)
 257                 kmem_zone_destroy(qm_dqzone);
 258         if (qm_dqtrxzone)
 259                 kmem_zone_destroy(qm_dqtrxzone);
 260 }