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 #define MNTOPT_QUOTA    "quota"         /* disk quotas (user) */
  52 #define MNTOPT_NOQUOTA  "noquota"       /* no quotas */
  53 #define MNTOPT_USRQUOTA "usrquota"      /* user quota enabled */
  54 #define MNTOPT_GRPQUOTA "grpquota"      /* group quota enabled */
  55 #define MNTOPT_PRJQUOTA "prjquota"      /* project quota enabled */
  56 #define MNTOPT_UQUOTA   "uquota"        /* user quota (IRIX variant) */
  57 #define MNTOPT_GQUOTA   "gquota"        /* group quota (IRIX variant) */
  58 #define MNTOPT_PQUOTA   "pquota"        /* project quota (IRIX variant) */
  59 #define MNTOPT_UQUOTANOENF "uqnoenforce"/* user quota limit enforcement */
  60 #define MNTOPT_GQUOTANOENF "gqnoenforce"/* group quota limit enforcement */
  61 #define MNTOPT_PQUOTANOENF "pqnoenforce"/* project quota limit enforcement */
  62 #define MNTOPT_QUOTANOENF  "qnoenforce" /* same as uqnoenforce */
  63
  64 STATIC int
  65 xfs_qm_parseargs(
  66         struct bhv_desc         *bhv,
  67         char                    *options,
  68         struct xfs_mount_args   *args,
  69         int                     update)
  70 {
  71         size_t                  length;
  72         char                    *local_options = options;
  73         char                    *this_char;
  74         int                     error;
  75         int                     referenced = update;
  76
  77         while ((this_char = strsep(&local_options, ",")) != NULL) {
  78                 length = strlen(this_char);
  79                 if (local_options)
  80                         length++;
  81
  82                 if (!strcmp(this_char, MNTOPT_NOQUOTA)) {
  83                         args->flags &= ~(XFSMNT_UQUOTAENF|XFSMNT_UQUOTA);
  84                         args->flags &= ~(XFSMNT_GQUOTAENF|XFSMNT_GQUOTA);
  85                         referenced = update;
  86                 } else if (!strcmp(this_char, MNTOPT_QUOTA) ||
  87                            !strcmp(this_char, MNTOPT_UQUOTA) ||
  88                            !strcmp(this_char, MNTOPT_USRQUOTA)) {
  89                         args->flags |= XFSMNT_UQUOTA | XFSMNT_UQUOTAENF;
  90                         referenced = 1;
  91                 } else if (!strcmp(this_char, MNTOPT_QUOTANOENF) ||
  92                            !strcmp(this_char, MNTOPT_UQUOTANOENF)) {
  93                         args->flags |= XFSMNT_UQUOTA;
  94                         args->flags &= ~XFSMNT_UQUOTAENF;
  95                         referenced = 1;
  96                 } else if (!strcmp(this_char, MNTOPT_PQUOTA) ||
  97                            !strcmp(this_char, MNTOPT_PRJQUOTA)) {
  98                         args->flags |= XFSMNT_PQUOTA | XFSMNT_PQUOTAENF;
  99                         referenced = 1;
 100                 } else if (!strcmp(this_char, MNTOPT_PQUOTANOENF)) {
 101                         args->flags |= XFSMNT_PQUOTA;
 102                         args->flags &= ~XFSMNT_PQUOTAENF;
 103                         referenced = 1;
 104                 } else if (!strcmp(this_char, MNTOPT_GQUOTA) ||
 105                            !strcmp(this_char, MNTOPT_GRPQUOTA)) {
 106                         args->flags |= XFSMNT_GQUOTA | XFSMNT_GQUOTAENF;
 107                         referenced = 1;
 108                 } else if (!strcmp(this_char, MNTOPT_GQUOTANOENF)) {
 109                         args->flags |= XFSMNT_GQUOTA;
 110                         args->flags &= ~XFSMNT_GQUOTAENF;
 111                         referenced = 1;
 112                 } else {
 113                         if (local_options)
 114                                 *(local_options-1) = ',';
 115                         continue;
 116                 }
 117
 118                 while (length--)
 119                         *this_char++ = ',';
 120         }
 121
 122         if ((args->flags & XFSMNT_GQUOTA) && (args->flags & XFSMNT_PQUOTA)) {
 123                 cmn_err(CE_WARN,
 124                         "XFS: cannot mount with both project and group quota");
 125                 return XFS_ERROR(EINVAL);
 126         }
 127
 128         error = bhv_next_vfs_parseargs(BHV_NEXT(bhv), options, args, update);
 129         if (!error && !referenced)
 130                 bhv_remove_vfsops(bhvtovfs(bhv), VFS_POSITION_QM);
 131         return error;
 132 }
 133
 134 STATIC int
 135 xfs_qm_showargs(
 136         struct bhv_desc         *bhv,
 137         struct seq_file         *m)
 138 {
 139         struct bhv_vfs          *vfsp = bhvtovfs(bhv);
 140         struct xfs_mount        *mp = XFS_VFSTOM(vfsp);
 141
 142         if (mp->m_qflags & XFS_UQUOTA_ACCT) {
 143                 (mp->m_qflags & XFS_UQUOTA_ENFD) ?
 144                         seq_puts(m, "," MNTOPT_USRQUOTA) :
 145                         seq_puts(m, "," MNTOPT_UQUOTANOENF);
 146         }
 147
 148         if (mp->m_qflags & XFS_PQUOTA_ACCT) {
 149                 (mp->m_qflags & XFS_OQUOTA_ENFD) ?
 150                         seq_puts(m, "," MNTOPT_PRJQUOTA) :
 151                         seq_puts(m, "," MNTOPT_PQUOTANOENF);
 152         }
 153
 154         if (mp->m_qflags & XFS_GQUOTA_ACCT) {
 155                 (mp->m_qflags & XFS_OQUOTA_ENFD) ?
 156                         seq_puts(m, "," MNTOPT_GRPQUOTA) :
 157                         seq_puts(m, "," MNTOPT_GQUOTANOENF);
 158         }
 159
 160         if (!(mp->m_qflags & XFS_ALL_QUOTA_ACCT))
 161                 seq_puts(m, "," MNTOPT_NOQUOTA);
 162
 163         return bhv_next_vfs_showargs(BHV_NEXT(bhv), m);
 164 }
 165
 166 STATIC int
 167 xfs_qm_mount(
 168         struct bhv_desc         *bhv,
 169         struct xfs_mount_args   *args,
 170         struct cred             *cr)
 171 {
 172         struct bhv_vfs          *vfsp = bhvtovfs(bhv);
 173         struct xfs_mount        *mp = XFS_VFSTOM(vfsp);
 174
 175         if (args->flags & (XFSMNT_UQUOTA | XFSMNT_GQUOTA | XFSMNT_PQUOTA))
 176                 xfs_qm_mount_quotainit(mp, args->flags);
 177         return bhv_next_vfs_mount(BHV_NEXT(bhv), args, cr);
 178 }
 179
 180 /*
 181  * Directory tree accounting is implemented using project quotas, where
 182  * the project identifier is inherited from parent directories.
 183  * A statvfs (df, etc.) of a directory that is using project quota should
 184  * return a statvfs of the project, not the entire filesystem.
 185  * This makes such trees appear as if they are filesystems in themselves.
 186  */
 187 STATIC int
 188 xfs_qm_statvfs(
 189         struct bhv_desc         *bhv,
 190         bhv_statvfs_t           *statp,
 191         struct bhv_vnode        *vnode)
 192 {
 193         xfs_mount_t             *mp;
 194         xfs_inode_t             *ip;
 195         xfs_dquot_t             *dqp;
 196         xfs_disk_dquot_t        *dp;
 197         __uint64_t              limit;
 198         int                     error;
 199
 200         error = bhv_next_vfs_statvfs(BHV_NEXT(bhv), statp, vnode);
 201         if (error || !vnode)
 202                 return error;
 203
 204         mp = xfs_vfstom(bhvtovfs(bhv));
 205         ip = xfs_vtoi(vnode);
 206
 207         if (!(ip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT))
 208                 return 0;
 209         if (!(mp->m_qflags & XFS_PQUOTA_ACCT))
 210                 return 0;
 211         if (!(mp->m_qflags & XFS_OQUOTA_ENFD))
 212                 return 0;
 213
 214         if (xfs_qm_dqget(mp, NULL, ip->i_d.di_projid, XFS_DQ_PROJ, 0, &dqp))
 215                 return 0;
 216         dp = &dqp->q_core;
 217
 218         limit = dp->d_blk_softlimit ?
 219                 be64_to_cpu(dp->d_blk_softlimit) :
 220                 be64_to_cpu(dp->d_blk_hardlimit);
 221         if (limit && statp->f_blocks > limit) {
 222                 statp->f_blocks = limit;
 223                 statp->f_bfree =
 224                         (statp->f_blocks > be64_to_cpu(dp->d_bcount)) ?
 225                          (statp->f_blocks - be64_to_cpu(dp->d_bcount)) : 0;
 226         }
 227
 228         limit = dp->d_ino_softlimit ?
 229                 be64_to_cpu(dp->d_ino_softlimit) :
 230                 be64_to_cpu(dp->d_ino_hardlimit);
 231         if (limit && statp->f_files > limit) {
 232                 statp->f_files = limit;
 233                 statp->f_ffree =
 234                         (statp->f_files > be64_to_cpu(dp->d_icount)) ?
 235                          (statp->f_ffree - be64_to_cpu(dp->d_icount)) : 0;
 236         }
 237
 238         xfs_qm_dqput(dqp);
 239         return 0;
 240 }
 241
 242 STATIC int
 243 xfs_qm_syncall(
 244         struct bhv_desc         *bhv,
 245         int                     flags,
 246         cred_t                  *credp)
 247 {
 248         struct bhv_vfs          *vfsp = bhvtovfs(bhv);
 249         struct xfs_mount        *mp = XFS_VFSTOM(vfsp);
 250         int                     error;
 251
 252         /*
 253          * Get the Quota Manager to flush the dquots.
 254          */
 255         if (XFS_IS_QUOTA_ON(mp)) {
 256                 if ((error = xfs_qm_sync(mp, flags))) {
 257                         /*
 258                          * If we got an IO error, we will be shutting down.
 259                          * So, there's nothing more for us to do here.
 260                          */
 261                         ASSERT(error != EIO || XFS_FORCED_SHUTDOWN(mp));
 262                         if (XFS_FORCED_SHUTDOWN(mp)) {
 263                                 return XFS_ERROR(error);
 264                         }
 265                 }
 266         }
 267         return bhv_next_vfs_sync(BHV_NEXT(bhv), flags, credp);
 268 }
 269
 270 STATIC int
 271 xfs_qm_newmount(
 272         xfs_mount_t     *mp,
 273         uint            *needquotamount,
 274         uint            *quotaflags)
 275 {
 276         uint            quotaondisk;
 277         uint            uquotaondisk = 0, gquotaondisk = 0, pquotaondisk = 0;
 278
 279         *quotaflags = 0;
 280         *needquotamount = B_FALSE;
 281
 282         quotaondisk = XFS_SB_VERSION_HASQUOTA(&mp->m_sb) &&
 283                                 (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_ACCT);
 284
 285         if (quotaondisk) {
 286                 uquotaondisk = mp->m_sb.sb_qflags & XFS_UQUOTA_ACCT;
 287                 pquotaondisk = mp->m_sb.sb_qflags & XFS_PQUOTA_ACCT;
 288                 gquotaondisk = mp->m_sb.sb_qflags & XFS_GQUOTA_ACCT;
 289         }
 290
 291         /*
 292          * If the device itself is read-only, we can't allow
 293          * the user to change the state of quota on the mount -
 294          * this would generate a transaction on the ro device,
 295          * which would lead to an I/O error and shutdown
 296          */
 297
 298         if (((uquotaondisk && !XFS_IS_UQUOTA_ON(mp)) ||
 299             (!uquotaondisk &&  XFS_IS_UQUOTA_ON(mp)) ||
 300              (pquotaondisk && !XFS_IS_PQUOTA_ON(mp)) ||
 301             (!pquotaondisk &&  XFS_IS_PQUOTA_ON(mp)) ||
 302              (gquotaondisk && !XFS_IS_GQUOTA_ON(mp)) ||
 303             (!gquotaondisk &&  XFS_IS_OQUOTA_ON(mp)))  &&
 304             xfs_dev_is_read_only(mp, "changing quota state")) {
 305                 cmn_err(CE_WARN,
 306                         "XFS: please mount with%s%s%s%s.",
 307                         (!quotaondisk ? "out quota" : ""),
 308                         (uquotaondisk ? " usrquota" : ""),
 309                         (pquotaondisk ? " prjquota" : ""),
 310                         (gquotaondisk ? " grpquota" : ""));
 311                 return XFS_ERROR(EPERM);
 312         }
 313
 314         if (XFS_IS_QUOTA_ON(mp) || quotaondisk) {
 315                 /*
 316                  * Call mount_quotas at this point only if we won't have to do
 317                  * a quotacheck.
 318                  */
 319                 if (quotaondisk && !XFS_QM_NEED_QUOTACHECK(mp)) {
 320                         /*
 321                          * If an error occured, qm_mount_quotas code
 322                          * has already disabled quotas. So, just finish
 323                          * mounting, and get on with the boring life
 324                          * without disk quotas.
 325                          */
 326                         xfs_qm_mount_quotas(mp, 0);
 327                 } else {
 328                         /*
 329                          * Clear the quota flags, but remember them. This
 330                          * is so that the quota code doesn't get invoked
 331                          * before we're ready. This can happen when an
 332                          * inode goes inactive and wants to free blocks,
 333                          * or via xfs_log_mount_finish.
 334                          */
 335                         *needquotamount = B_TRUE;
 336                         *quotaflags = mp->m_qflags;
 337                         mp->m_qflags = 0;
 338                 }
 339         }
 340
 341         return 0;
 342 }
 343
 344 STATIC int
 345 xfs_qm_endmount(
 346         xfs_mount_t     *mp,
 347         uint            needquotamount,
 348         uint            quotaflags,
 349         int             mfsi_flags)
 350 {
 351         if (needquotamount) {
 352                 ASSERT(mp->m_qflags == 0);
 353                 mp->m_qflags = quotaflags;
 354                 xfs_qm_mount_quotas(mp, mfsi_flags);
 355         }
 356
 357 #if defined(DEBUG) && defined(XFS_LOUD_RECOVERY)
 358         if (! (XFS_IS_QUOTA_ON(mp)))
 359                 xfs_fs_cmn_err(CE_NOTE, mp, "Disk quotas not turned on");
 360         else
 361                 xfs_fs_cmn_err(CE_NOTE, mp, "Disk quotas turned on");
 362 #endif
 363
 364 #ifdef QUOTADEBUG
 365         if (XFS_IS_QUOTA_ON(mp) && xfs_qm_internalqcheck(mp))
 366                 cmn_err(CE_WARN, "XFS: mount internalqcheck failed");
 367 #endif
 368
 369         return 0;
 370 }
 371
 372 STATIC void
 373 xfs_qm_dqrele_null(
 374         xfs_dquot_t     *dq)
 375 {
 376         /*
 377          * Called from XFS, where we always check first for a NULL dquot.
 378          */
 379         if (!dq)
 380                 return;
 381         xfs_qm_dqrele(dq);
 382 }
 383
 384
 385 static struct xfs_qmops xfs_qmcore_xfs = {
 386         .xfs_qminit             = xfs_qm_newmount,
 387         .xfs_qmdone             = xfs_qm_unmount_quotadestroy,
 388         .xfs_qmmount            = xfs_qm_endmount,
 389         .xfs_qmunmount          = xfs_qm_unmount_quotas,
 390         .xfs_dqrele             = xfs_qm_dqrele_null,
 391         .xfs_dqattach           = xfs_qm_dqattach,
 392         .xfs_dqdetach           = xfs_qm_dqdetach,
 393         .xfs_dqpurgeall         = xfs_qm_dqpurge_all,
 394         .xfs_dqvopalloc         = xfs_qm_vop_dqalloc,
 395         .xfs_dqvopcreate        = xfs_qm_vop_dqattach_and_dqmod_newinode,
 396         .xfs_dqvoprename        = xfs_qm_vop_rename_dqattach,
 397         .xfs_dqvopchown         = xfs_qm_vop_chown,
 398         .xfs_dqvopchownresv     = xfs_qm_vop_chown_reserve,
 399         .xfs_dqtrxops           = &xfs_trans_dquot_ops,
 400 };
 401
 402 struct bhv_module_vfsops xfs_qmops = { {
 403         BHV_IDENTITY_INIT(VFS_BHV_QM, VFS_POSITION_QM),
 404         .vfs_parseargs          = xfs_qm_parseargs,
 405         .vfs_showargs           = xfs_qm_showargs,
 406         .vfs_mount              = xfs_qm_mount,
 407         .vfs_statvfs            = xfs_qm_statvfs,
 408         .vfs_sync               = xfs_qm_syncall,
 409         .vfs_quotactl           = xfs_qm_quotactl, },
 410 };
 411
 412
 413 void __init
 414 xfs_qm_init(void)
 415 {
 416         static char     message[] __initdata =
 417                 KERN_INFO "SGI XFS Quota Management subsystem\n";
 418
 419         printk(message);
 420         mutex_init(&xfs_Gqm_lock);
 421         vfs_bhv_set_custom(&xfs_qmops, &xfs_qmcore_xfs);
 422         xfs_qm_init_procfs();
 423 }
 424
 425 void __exit
 426 xfs_qm_exit(void)
 427 {
 428         vfs_bhv_clr_custom(&xfs_qmops);
 429         xfs_qm_cleanup_procfs();
 430         if (qm_dqzone)
 431                 kmem_zone_destroy(qm_dqzone);
 432         if (qm_dqtrxzone)
 433                 kmem_zone_destroy(qm_dqtrxzone);
 434 }