git.oblomov.eu Git - linux-2.6/blob - 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_trans.h"
  24 #include "xfs_sb.h"
  25 #include "xfs_ag.h"
  26 #include "xfs_dir2.h"
  27 #include "xfs_alloc.h"
  28 #include "xfs_dmapi.h"
  29 #include "xfs_quota.h"
  30 #include "xfs_mount.h"
  31 #include "xfs_bmap_btree.h"
  32 #include "xfs_alloc_btree.h"
  33 #include "xfs_ialloc_btree.h"
  34 #include "xfs_dir2_sf.h"
  35 #include "xfs_attr_sf.h"
  36 #include "xfs_dinode.h"
  37 #include "xfs_inode.h"
  38 #include "xfs_ialloc.h"
  39 #include "xfs_itable.h"
  40 #include "xfs_btree.h"
  41 #include "xfs_bmap.h"
  42 #include "xfs_rtalloc.h"
  43 #include "xfs_error.h"
  44 #include "xfs_rw.h"
  45 #include "xfs_acl.h"
  46 #include "xfs_attr.h"
  47 #include "xfs_buf_item.h"
  48 #include "xfs_qm.h"
  49
  50
  51 STATIC void
  52 xfs_fill_statvfs_from_dquot(
  53         struct kstatfs          *statp,
  54         xfs_disk_dquot_t        *dp)
  55 {
  56         __uint64_t              limit;
  57
  58         limit = dp->d_blk_softlimit ?
  59                 be64_to_cpu(dp->d_blk_softlimit) :
  60                 be64_to_cpu(dp->d_blk_hardlimit);
  61         if (limit && statp->f_blocks > limit) {
  62                 statp->f_blocks = limit;
  63                 statp->f_bfree =
  64                         (statp->f_blocks > be64_to_cpu(dp->d_bcount)) ?
  65                          (statp->f_blocks - be64_to_cpu(dp->d_bcount)) : 0;
  66         }
  67
  68         limit = dp->d_ino_softlimit ?
  69                 be64_to_cpu(dp->d_ino_softlimit) :
  70                 be64_to_cpu(dp->d_ino_hardlimit);
  71         if (limit && statp->f_files > limit) {
  72                 statp->f_files = limit;
  73                 statp->f_ffree =
  74                         (statp->f_files > be64_to_cpu(dp->d_icount)) ?
  75                          (statp->f_ffree - be64_to_cpu(dp->d_icount)) : 0;
  76         }
  77 }
  78
  79
  80 /*
  81  * Directory tree accounting is implemented using project quotas, where
  82  * the project identifier is inherited from parent directories.
  83  * A statvfs (df, etc.) of a directory that is using project quota should
  84  * return a statvfs of the project, not the entire filesystem.
  85  * This makes such trees appear as if they are filesystems in themselves.
  86  */
  87 STATIC void
  88 xfs_qm_statvfs(
  89         xfs_inode_t             *ip,
  90         struct kstatfs          *statp)
  91 {
  92         xfs_mount_t             *mp = ip->i_mount;
  93         xfs_dquot_t             *dqp;
  94
  95         if (!(ip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) ||
  96             !((mp->m_qflags & (XFS_PQUOTA_ACCT|XFS_OQUOTA_ENFD))) ==
  97                               (XFS_PQUOTA_ACCT|XFS_OQUOTA_ENFD))
  98                 return;
  99
 100         if (!xfs_qm_dqget(mp, NULL, ip->i_d.di_projid, XFS_DQ_PROJ, 0, &dqp)) {
 101                 xfs_disk_dquot_t        *dp = &dqp->q_core;
 102
 103                 xfs_fill_statvfs_from_dquot(statp, dp);
 104                 xfs_qm_dqput(dqp);
 105         }
 106 }
 107
 108 STATIC int
 109 xfs_qm_newmount(
 110         xfs_mount_t     *mp,
 111         uint            *needquotamount,
 112         uint            *quotaflags)
 113 {
 114         uint            quotaondisk;
 115         uint            uquotaondisk = 0, gquotaondisk = 0, pquotaondisk = 0;
 116
 117         *quotaflags = 0;
 118         *needquotamount = B_FALSE;
 119
 120         quotaondisk = xfs_sb_version_hasquota(&mp->m_sb) &&
 121                                 (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_ACCT);
 122
 123         if (quotaondisk) {
 124                 uquotaondisk = mp->m_sb.sb_qflags & XFS_UQUOTA_ACCT;
 125                 pquotaondisk = mp->m_sb.sb_qflags & XFS_PQUOTA_ACCT;
 126                 gquotaondisk = mp->m_sb.sb_qflags & XFS_GQUOTA_ACCT;
 127         }
 128
 129         /*
 130          * If the device itself is read-only, we can't allow
 131          * the user to change the state of quota on the mount -
 132          * this would generate a transaction on the ro device,
 133          * which would lead to an I/O error and shutdown
 134          */
 135
 136         if (((uquotaondisk && !XFS_IS_UQUOTA_ON(mp)) ||
 137             (!uquotaondisk &&  XFS_IS_UQUOTA_ON(mp)) ||
 138              (pquotaondisk && !XFS_IS_PQUOTA_ON(mp)) ||
 139             (!pquotaondisk &&  XFS_IS_PQUOTA_ON(mp)) ||
 140              (gquotaondisk && !XFS_IS_GQUOTA_ON(mp)) ||
 141             (!gquotaondisk &&  XFS_IS_OQUOTA_ON(mp)))  &&
 142             xfs_dev_is_read_only(mp, "changing quota state")) {
 143                 cmn_err(CE_WARN,
 144                         "XFS: please mount with%s%s%s%s.",
 145                         (!quotaondisk ? "out quota" : ""),
 146                         (uquotaondisk ? " usrquota" : ""),
 147                         (pquotaondisk ? " prjquota" : ""),
 148                         (gquotaondisk ? " grpquota" : ""));
 149                 return XFS_ERROR(EPERM);
 150         }
 151
 152         if (XFS_IS_QUOTA_ON(mp) || quotaondisk) {
 153                 /*
 154                  * Call mount_quotas at this point only if we won't have to do
 155                  * a quotacheck.
 156                  */
 157                 if (quotaondisk && !XFS_QM_NEED_QUOTACHECK(mp)) {
 158                         /*
 159                          * If an error occured, qm_mount_quotas code
 160                          * has already disabled quotas. So, just finish
 161                          * mounting, and get on with the boring life
 162                          * without disk quotas.
 163                          */
 164                         xfs_qm_mount_quotas(mp);
 165                 } else {
 166                         /*
 167                          * Clear the quota flags, but remember them. This
 168                          * is so that the quota code doesn't get invoked
 169                          * before we're ready. This can happen when an
 170                          * inode goes inactive and wants to free blocks,
 171                          * or via xfs_log_mount_finish.
 172                          */
 173                         *needquotamount = B_TRUE;
 174                         *quotaflags = mp->m_qflags;
 175                         mp->m_qflags = 0;
 176                 }
 177         }
 178
 179         return 0;
 180 }
 181
 182 STATIC int
 183 xfs_qm_endmount(
 184         xfs_mount_t     *mp,
 185         uint            needquotamount,
 186         uint            quotaflags)
 187 {
 188         if (needquotamount) {
 189                 ASSERT(mp->m_qflags == 0);
 190                 mp->m_qflags = quotaflags;
 191                 xfs_qm_mount_quotas(mp);
 192         }
 193
 194 #if defined(DEBUG) && defined(XFS_LOUD_RECOVERY)
 195         if (! (XFS_IS_QUOTA_ON(mp)))
 196                 xfs_fs_cmn_err(CE_NOTE, mp, "Disk quotas not turned on");
 197         else
 198                 xfs_fs_cmn_err(CE_NOTE, mp, "Disk quotas turned on");
 199 #endif
 200
 201 #ifdef QUOTADEBUG
 202         if (XFS_IS_QUOTA_ON(mp) && xfs_qm_internalqcheck(mp))
 203                 cmn_err(CE_WARN, "XFS: mount internalqcheck failed");
 204 #endif
 205
 206         return 0;
 207 }
 208
 209 STATIC void
 210 xfs_qm_dqrele_null(
 211         xfs_dquot_t     *dq)
 212 {
 213         /*
 214          * Called from XFS, where we always check first for a NULL dquot.
 215          */
 216         if (!dq)
 217                 return;
 218         xfs_qm_dqrele(dq);
 219 }
 220
 221
 222 struct xfs_qmops xfs_qmcore_xfs = {
 223         .xfs_qminit             = xfs_qm_newmount,
 224         .xfs_qmdone             = xfs_qm_unmount_quotadestroy,
 225         .xfs_qmmount            = xfs_qm_endmount,
 226         .xfs_qmunmount          = xfs_qm_unmount_quotas,
 227         .xfs_dqrele             = xfs_qm_dqrele_null,
 228         .xfs_dqattach           = xfs_qm_dqattach,
 229         .xfs_dqdetach           = xfs_qm_dqdetach,
 230         .xfs_dqpurgeall         = xfs_qm_dqpurge_all,
 231         .xfs_dqvopalloc         = xfs_qm_vop_dqalloc,
 232         .xfs_dqvopcreate        = xfs_qm_vop_dqattach_and_dqmod_newinode,
 233         .xfs_dqvoprename        = xfs_qm_vop_rename_dqattach,
 234         .xfs_dqvopchown         = xfs_qm_vop_chown,
 235         .xfs_dqvopchownresv     = xfs_qm_vop_chown_reserve,
 236         .xfs_dqstatvfs          = xfs_qm_statvfs,
 237         .xfs_dqsync             = xfs_qm_sync,
 238         .xfs_dqtrxops           = &xfs_trans_dquot_ops,
 239 };
 240 EXPORT_SYMBOL(xfs_qmcore_xfs);
 241
 242 void __init
 243 xfs_qm_init(void)
 244 {
 245         printk(KERN_INFO "SGI XFS Quota Management subsystem\n");
 246         mutex_init(&xfs_Gqm_lock);
 247         xfs_qm_init_procfs();
 248 }
 249
 250 void __exit
 251 xfs_qm_exit(void)
 252 {
 253         xfs_qm_cleanup_procfs();
 254         if (qm_dqzone)
 255                 kmem_zone_destroy(qm_dqzone);
 256         if (qm_dqtrxzone)
 257                 kmem_zone_destroy(qm_dqtrxzone);
 258 }