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_cap.h"
  48 #include "xfs_mac.h"
  49 #include "xfs_attr.h"
  50 #include "xfs_buf_item.h"
  51 #include "xfs_qm.h"
  52
  53 #define MNTOPT_QUOTA    "quota"         /* disk quotas (user) */
  54 #define MNTOPT_NOQUOTA  "noquota"       /* no quotas */
  55 #define MNTOPT_USRQUOTA "usrquota"      /* user quota enabled */
  56 #define MNTOPT_GRPQUOTA "grpquota"      /* group quota enabled */
  57 #define MNTOPT_PRJQUOTA "prjquota"      /* project quota enabled */
  58 #define MNTOPT_UQUOTA   "uquota"        /* user quota (IRIX variant) */
  59 #define MNTOPT_GQUOTA   "gquota"        /* group quota (IRIX variant) */
  60 #define MNTOPT_PQUOTA   "pquota"        /* project quota (IRIX variant) */
  61 #define MNTOPT_UQUOTANOENF "uqnoenforce"/* user quota limit enforcement */
  62 #define MNTOPT_GQUOTANOENF "gqnoenforce"/* group quota limit enforcement */
  63 #define MNTOPT_PQUOTANOENF "pqnoenforce"/* project quota limit enforcement */
  64 #define MNTOPT_QUOTANOENF  "qnoenforce" /* same as uqnoenforce */
  65
  66 STATIC int
  67 xfs_qm_parseargs(
  68         struct bhv_desc         *bhv,
  69         char                    *options,
  70         struct xfs_mount_args   *args,
  71         int                     update)
  72 {
  73         size_t                  length;
  74         char                    *local_options = options;
  75         char                    *this_char;
  76         int                     error;
  77         int                     referenced = update;
  78
  79         while ((this_char = strsep(&local_options, ",")) != NULL) {
  80                 length = strlen(this_char);
  81                 if (local_options)
  82                         length++;
  83
  84                 if (!strcmp(this_char, MNTOPT_NOQUOTA)) {
  85                         args->flags &= ~(XFSMNT_UQUOTAENF|XFSMNT_UQUOTA);
  86                         args->flags &= ~(XFSMNT_GQUOTAENF|XFSMNT_GQUOTA);
  87                         referenced = update;
  88                 } else if (!strcmp(this_char, MNTOPT_QUOTA) ||
  89                            !strcmp(this_char, MNTOPT_UQUOTA) ||
  90                            !strcmp(this_char, MNTOPT_USRQUOTA)) {
  91                         args->flags |= XFSMNT_UQUOTA | XFSMNT_UQUOTAENF;
  92                         referenced = 1;
  93                 } else if (!strcmp(this_char, MNTOPT_QUOTANOENF) ||
  94                            !strcmp(this_char, MNTOPT_UQUOTANOENF)) {
  95                         args->flags |= XFSMNT_UQUOTA;
  96                         args->flags &= ~XFSMNT_UQUOTAENF;
  97                         referenced = 1;
  98                 } else if (!strcmp(this_char, MNTOPT_PQUOTA) ||
  99                            !strcmp(this_char, MNTOPT_PRJQUOTA)) {
 100                         args->flags |= XFSMNT_PQUOTA | XFSMNT_PQUOTAENF;
 101                         referenced = 1;
 102                 } else if (!strcmp(this_char, MNTOPT_PQUOTANOENF)) {
 103                         args->flags |= XFSMNT_PQUOTA;
 104                         args->flags &= ~XFSMNT_PQUOTAENF;
 105                         referenced = 1;
 106                 } else if (!strcmp(this_char, MNTOPT_GQUOTA) ||
 107                            !strcmp(this_char, MNTOPT_GRPQUOTA)) {
 108                         args->flags |= XFSMNT_GQUOTA | XFSMNT_GQUOTAENF;
 109                         referenced = 1;
 110                 } else if (!strcmp(this_char, MNTOPT_GQUOTANOENF)) {
 111                         args->flags |= XFSMNT_GQUOTA;
 112                         args->flags &= ~XFSMNT_GQUOTAENF;
 113                         referenced = 1;
 114                 } else {
 115                         if (local_options)
 116                                 *(local_options-1) = ',';
 117                         continue;
 118                 }
 119
 120                 while (length--)
 121                         *this_char++ = ',';
 122         }
 123
 124         if ((args->flags & XFSMNT_GQUOTA) && (args->flags & XFSMNT_PQUOTA)) {
 125                 cmn_err(CE_WARN,
 126                         "XFS: cannot mount with both project and group quota");
 127                 return XFS_ERROR(EINVAL);
 128         }
 129
 130         error = bhv_next_vfs_parseargs(BHV_NEXT(bhv), options, args, update);
 131         if (!error && !referenced)
 132                 bhv_remove_vfsops(bhvtovfs(bhv), VFS_POSITION_QM);
 133         return error;
 134 }
 135
 136 STATIC int
 137 xfs_qm_showargs(
 138         struct bhv_desc         *bhv,
 139         struct seq_file         *m)
 140 {
 141         struct bhv_vfs          *vfsp = bhvtovfs(bhv);
 142         struct xfs_mount        *mp = XFS_VFSTOM(vfsp);
 143
 144         if (mp->m_qflags & XFS_UQUOTA_ACCT) {
 145                 (mp->m_qflags & XFS_UQUOTA_ENFD) ?
 146                         seq_puts(m, "," MNTOPT_USRQUOTA) :
 147                         seq_puts(m, "," MNTOPT_UQUOTANOENF);
 148         }
 149
 150         if (mp->m_qflags & XFS_PQUOTA_ACCT) {
 151                 (mp->m_qflags & XFS_OQUOTA_ENFD) ?
 152                         seq_puts(m, "," MNTOPT_PRJQUOTA) :
 153                         seq_puts(m, "," MNTOPT_PQUOTANOENF);
 154         }
 155
 156         if (mp->m_qflags & XFS_GQUOTA_ACCT) {
 157                 (mp->m_qflags & XFS_OQUOTA_ENFD) ?
 158                         seq_puts(m, "," MNTOPT_GRPQUOTA) :
 159                         seq_puts(m, "," MNTOPT_GQUOTANOENF);
 160         }
 161
 162         if (!(mp->m_qflags & XFS_ALL_QUOTA_ACCT))
 163                 seq_puts(m, "," MNTOPT_NOQUOTA);
 164
 165         return bhv_next_vfs_showargs(BHV_NEXT(bhv), m);
 166 }
 167
 168 STATIC int
 169 xfs_qm_mount(
 170         struct bhv_desc         *bhv,
 171         struct xfs_mount_args   *args,
 172         struct cred             *cr)
 173 {
 174         struct bhv_vfs          *vfsp = bhvtovfs(bhv);
 175         struct xfs_mount        *mp = XFS_VFSTOM(vfsp);
 176
 177         if (args->flags & (XFSMNT_UQUOTA | XFSMNT_GQUOTA | XFSMNT_PQUOTA))
 178                 xfs_qm_mount_quotainit(mp, args->flags);
 179         return bhv_next_vfs_mount(BHV_NEXT(bhv), args, cr);
 180 }
 181
 182 /*
 183  * Directory tree accounting is implemented using project quotas, where
 184  * the project identifier is inherited from parent directories.
 185  * A statvfs (df, etc.) of a directory that is using project quota should
 186  * return a statvfs of the project, not the entire filesystem.
 187  * This makes such trees appear as if they are filesystems in themselves.
 188  */
 189 STATIC int
 190 xfs_qm_statvfs(
 191         struct bhv_desc         *bhv,
 192         bhv_statvfs_t           *statp,
 193         struct bhv_vnode        *vnode)
 194 {
 195         xfs_mount_t             *mp;
 196         xfs_inode_t             *ip;
 197         xfs_dquot_t             *dqp;
 198         xfs_disk_dquot_t        *dp;
 199         __uint64_t              limit;
 200         int                     error;
 201
 202         error = bhv_next_vfs_statvfs(BHV_NEXT(bhv), statp, vnode);
 203         if (error || !vnode)
 204                 return error;
 205
 206         mp = xfs_vfstom(bhvtovfs(bhv));
 207         ip = xfs_vtoi(vnode);
 208
 209         if (!(ip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT))
 210                 return 0;
 211         if (!(mp->m_qflags & XFS_PQUOTA_ACCT))
 212                 return 0;
 213         if (!(mp->m_qflags & XFS_OQUOTA_ENFD))
 214                 return 0;
 215
 216         if (xfs_qm_dqget(mp, NULL, ip->i_d.di_projid, XFS_DQ_PROJ, 0, &dqp))
 217                 return 0;
 218         dp = &dqp->q_core;
 219
 220         limit = dp->d_blk_softlimit ?
 221                 be64_to_cpu(dp->d_blk_softlimit) :
 222                 be64_to_cpu(dp->d_blk_hardlimit);
 223         if (limit && statp->f_blocks > limit) {
 224                 statp->f_blocks = limit;
 225                 statp->f_bfree =
 226                         (statp->f_blocks > be64_to_cpu(dp->d_bcount)) ?
 227                          (statp->f_blocks - be64_to_cpu(dp->d_bcount)) : 0;
 228         }
 229
 230         limit = dp->d_ino_softlimit ?
 231                 be64_to_cpu(dp->d_ino_softlimit) :
 232                 be64_to_cpu(dp->d_ino_hardlimit);
 233         if (limit && statp->f_files > limit) {
 234                 statp->f_files = limit;
 235                 statp->f_ffree =
 236                         (statp->f_files > be64_to_cpu(dp->d_icount)) ?
 237                          (statp->f_ffree - be64_to_cpu(dp->d_icount)) : 0;
 238         }
 239
 240         xfs_qm_dqput(dqp);
 241         return 0;
 242 }
 243
 244 STATIC int
 245 xfs_qm_syncall(
 246         struct bhv_desc         *bhv,
 247         int                     flags,
 248         cred_t                  *credp)
 249 {
 250         struct bhv_vfs          *vfsp = bhvtovfs(bhv);
 251         struct xfs_mount        *mp = XFS_VFSTOM(vfsp);
 252         int                     error;
 253
 254         /*
 255          * Get the Quota Manager to flush the dquots.
 256          */
 257         if (XFS_IS_QUOTA_ON(mp)) {
 258                 if ((error = xfs_qm_sync(mp, flags))) {
 259                         /*
 260                          * If we got an IO error, we will be shutting down.
 261                          * So, there's nothing more for us to do here.
 262                          */
 263                         ASSERT(error != EIO || XFS_FORCED_SHUTDOWN(mp));
 264                         if (XFS_FORCED_SHUTDOWN(mp)) {
 265                                 return XFS_ERROR(error);
 266                         }
 267                 }
 268         }
 269         return bhv_next_vfs_sync(BHV_NEXT(bhv), flags, credp);
 270 }
 271
 272 STATIC int
 273 xfs_qm_newmount(
 274         xfs_mount_t     *mp,
 275         uint            *needquotamount,
 276         uint            *quotaflags)
 277 {
 278         uint            quotaondisk;
 279         uint            uquotaondisk = 0, gquotaondisk = 0, pquotaondisk = 0;
 280
 281         *quotaflags = 0;
 282         *needquotamount = B_FALSE;
 283
 284         quotaondisk = XFS_SB_VERSION_HASQUOTA(&mp->m_sb) &&
 285                                 (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_ACCT);
 286
 287         if (quotaondisk) {
 288                 uquotaondisk = mp->m_sb.sb_qflags & XFS_UQUOTA_ACCT;
 289                 pquotaondisk = mp->m_sb.sb_qflags & XFS_PQUOTA_ACCT;
 290                 gquotaondisk = mp->m_sb.sb_qflags & XFS_GQUOTA_ACCT;
 291         }
 292
 293         /*
 294          * If the device itself is read-only, we can't allow
 295          * the user to change the state of quota on the mount -
 296          * this would generate a transaction on the ro device,
 297          * which would lead to an I/O error and shutdown
 298          */
 299
 300         if (((uquotaondisk && !XFS_IS_UQUOTA_ON(mp)) ||
 301             (!uquotaondisk &&  XFS_IS_UQUOTA_ON(mp)) ||
 302              (pquotaondisk && !XFS_IS_PQUOTA_ON(mp)) ||
 303             (!pquotaondisk &&  XFS_IS_PQUOTA_ON(mp)) ||
 304              (gquotaondisk && !XFS_IS_GQUOTA_ON(mp)) ||
 305             (!gquotaondisk &&  XFS_IS_OQUOTA_ON(mp)))  &&
 306             xfs_dev_is_read_only(mp, "changing quota state")) {
 307                 cmn_err(CE_WARN,
 308                         "XFS: please mount with%s%s%s%s.",
 309                         (!quotaondisk ? "out quota" : ""),
 310                         (uquotaondisk ? " usrquota" : ""),
 311                         (pquotaondisk ? " prjquota" : ""),
 312                         (gquotaondisk ? " grpquota" : ""));
 313                 return XFS_ERROR(EPERM);
 314         }
 315
 316         if (XFS_IS_QUOTA_ON(mp) || quotaondisk) {
 317                 /*
 318                  * Call mount_quotas at this point only if we won't have to do
 319                  * a quotacheck.
 320                  */
 321                 if (quotaondisk && !XFS_QM_NEED_QUOTACHECK(mp)) {
 322                         /*
 323                          * If an error occured, qm_mount_quotas code
 324                          * has already disabled quotas. So, just finish
 325                          * mounting, and get on with the boring life
 326                          * without disk quotas.
 327                          */
 328                         xfs_qm_mount_quotas(mp, 0);
 329                 } else {
 330                         /*
 331                          * Clear the quota flags, but remember them. This
 332                          * is so that the quota code doesn't get invoked
 333                          * before we're ready. This can happen when an
 334                          * inode goes inactive and wants to free blocks,
 335                          * or via xfs_log_mount_finish.
 336                          */
 337                         *needquotamount = B_TRUE;
 338                         *quotaflags = mp->m_qflags;
 339                         mp->m_qflags = 0;
 340                 }
 341         }
 342
 343         return 0;
 344 }
 345
 346 STATIC int
 347 xfs_qm_endmount(
 348         xfs_mount_t     *mp,
 349         uint            needquotamount,
 350         uint            quotaflags,
 351         int             mfsi_flags)
 352 {
 353         if (needquotamount) {
 354                 ASSERT(mp->m_qflags == 0);
 355                 mp->m_qflags = quotaflags;
 356                 xfs_qm_mount_quotas(mp, mfsi_flags);
 357         }
 358
 359 #if defined(DEBUG) && defined(XFS_LOUD_RECOVERY)
 360         if (! (XFS_IS_QUOTA_ON(mp)))
 361                 xfs_fs_cmn_err(CE_NOTE, mp, "Disk quotas not turned on");
 362         else
 363                 xfs_fs_cmn_err(CE_NOTE, mp, "Disk quotas turned on");
 364 #endif
 365
 366 #ifdef QUOTADEBUG
 367         if (XFS_IS_QUOTA_ON(mp) && xfs_qm_internalqcheck(mp))
 368                 cmn_err(CE_WARN, "XFS: mount internalqcheck failed");
 369 #endif
 370
 371         return 0;
 372 }
 373
 374 STATIC void
 375 xfs_qm_dqrele_null(
 376         xfs_dquot_t     *dq)
 377 {
 378         /*
 379          * Called from XFS, where we always check first for a NULL dquot.
 380          */
 381         if (!dq)
 382                 return;
 383         xfs_qm_dqrele(dq);
 384 }
 385
 386
 387 STATIC struct xfs_qmops xfs_qmcore_xfs = {
 388         .xfs_qminit             = xfs_qm_newmount,
 389         .xfs_qmdone             = xfs_qm_unmount_quotadestroy,
 390         .xfs_qmmount            = xfs_qm_endmount,
 391         .xfs_qmunmount          = xfs_qm_unmount_quotas,
 392         .xfs_dqrele             = xfs_qm_dqrele_null,
 393         .xfs_dqattach           = xfs_qm_dqattach,
 394         .xfs_dqdetach           = xfs_qm_dqdetach,
 395         .xfs_dqpurgeall         = xfs_qm_dqpurge_all,
 396         .xfs_dqvopalloc         = xfs_qm_vop_dqalloc,
 397         .xfs_dqvopcreate        = xfs_qm_vop_dqattach_and_dqmod_newinode,
 398         .xfs_dqvoprename        = xfs_qm_vop_rename_dqattach,
 399         .xfs_dqvopchown         = xfs_qm_vop_chown,
 400         .xfs_dqvopchownresv     = xfs_qm_vop_chown_reserve,
 401         .xfs_dqtrxops           = &xfs_trans_dquot_ops,
 402 };
 403
 404 struct bhv_module_vfsops xfs_qmops = { {
 405         BHV_IDENTITY_INIT(VFS_BHV_QM, VFS_POSITION_QM),
 406         .vfs_parseargs          = xfs_qm_parseargs,
 407         .vfs_showargs           = xfs_qm_showargs,
 408         .vfs_mount              = xfs_qm_mount,
 409         .vfs_statvfs            = xfs_qm_statvfs,
 410         .vfs_sync               = xfs_qm_syncall,
 411         .vfs_quotactl           = xfs_qm_quotactl, },
 412 };
 413
 414
 415 void __init
 416 xfs_qm_init(void)
 417 {
 418         static char     message[] __initdata =
 419                 KERN_INFO "SGI XFS Quota Management subsystem\n";
 420
 421         printk(message);
 422         mutex_init(&xfs_Gqm_lock);
 423         vfs_bhv_set_custom(&xfs_qmops, &xfs_qmcore_xfs);
 424         xfs_qm_init_procfs();
 425 }
 426
 427 void __exit
 428 xfs_qm_exit(void)
 429 {
 430         vfs_bhv_clr_custom(&xfs_qmops);
 431         xfs_qm_cleanup_procfs();
 432         if (qm_dqzone)
 433                 kmem_zone_destroy(qm_dqzone);
 434         if (qm_dqtrxzone)
 435                 kmem_zone_destroy(qm_dqtrxzone);
 436 }