err.no 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_clnt.h"
  24 #include "xfs_trans.h"
  25 #include "xfs_sb.h"
  26 #include "xfs_ag.h"
  27 #include "xfs_dir.h"
  28 #include "xfs_dir2.h"
  29 #include "xfs_alloc.h"
  30 #include "xfs_dmapi.h"
  31 #include "xfs_quota.h"
  32 #include "xfs_mount.h"
  33 #include "xfs_bmap_btree.h"
  34 #include "xfs_alloc_btree.h"
  35 #include "xfs_ialloc_btree.h"
  36 #include "xfs_dir_sf.h"
  37 #include "xfs_dir2_sf.h"
  38 #include "xfs_attr_sf.h"
  39 #include "xfs_dinode.h"
  40 #include "xfs_inode.h"
  41 #include "xfs_ialloc.h"
  42 #include "xfs_itable.h"
  43 #include "xfs_btree.h"
  44 #include "xfs_bmap.h"
  45 #include "xfs_rtalloc.h"
  46 #include "xfs_error.h"
  47 #include "xfs_rw.h"
  48 #include "xfs_acl.h"
  49 #include "xfs_cap.h"
  50 #include "xfs_mac.h"
  51 #include "xfs_attr.h"
  52 #include "xfs_buf_item.h"
  53 #include "xfs_qm.h"
  54
  55 #define MNTOPT_QUOTA    "quota"         /* disk quotas (user) */
  56 #define MNTOPT_NOQUOTA  "noquota"       /* no quotas */
  57 #define MNTOPT_USRQUOTA "usrquota"      /* user quota enabled */
  58 #define MNTOPT_GRPQUOTA "grpquota"      /* group quota enabled */
  59 #define MNTOPT_PRJQUOTA "prjquota"      /* project quota enabled */
  60 #define MNTOPT_UQUOTA   "uquota"        /* user quota (IRIX variant) */
  61 #define MNTOPT_GQUOTA   "gquota"        /* group quota (IRIX variant) */
  62 #define MNTOPT_PQUOTA   "pquota"        /* project quota (IRIX variant) */
  63 #define MNTOPT_UQUOTANOENF "uqnoenforce"/* user quota limit enforcement */
  64 #define MNTOPT_GQUOTANOENF "gqnoenforce"/* group quota limit enforcement */
  65 #define MNTOPT_PQUOTANOENF "pqnoenforce"/* project quota limit enforcement */
  66 #define MNTOPT_QUOTANOENF  "qnoenforce" /* same as uqnoenforce */
  67
  68 STATIC int
  69 xfs_qm_parseargs(
  70         struct bhv_desc         *bhv,
  71         char                    *options,
  72         struct xfs_mount_args   *args,
  73         int                     update)
  74 {
  75         size_t                  length;
  76         char                    *local_options = options;
  77         char                    *this_char;
  78         int                     error;
  79         int                     referenced = update;
  80
  81         while ((this_char = strsep(&local_options, ",")) != NULL) {
  82                 length = strlen(this_char);
  83                 if (local_options)
  84                         length++;
  85
  86                 if (!strcmp(this_char, MNTOPT_NOQUOTA)) {
  87                         args->flags &= ~(XFSMNT_UQUOTAENF|XFSMNT_UQUOTA);
  88                         args->flags &= ~(XFSMNT_GQUOTAENF|XFSMNT_GQUOTA);
  89                         referenced = update;
  90                 } else if (!strcmp(this_char, MNTOPT_QUOTA) ||
  91                            !strcmp(this_char, MNTOPT_UQUOTA) ||
  92                            !strcmp(this_char, MNTOPT_USRQUOTA)) {
  93                         args->flags |= XFSMNT_UQUOTA | XFSMNT_UQUOTAENF;
  94                         referenced = 1;
  95                 } else if (!strcmp(this_char, MNTOPT_QUOTANOENF) ||
  96                            !strcmp(this_char, MNTOPT_UQUOTANOENF)) {
  97                         args->flags |= XFSMNT_UQUOTA;
  98                         args->flags &= ~XFSMNT_UQUOTAENF;
  99                         referenced = 1;
 100                 } else if (!strcmp(this_char, MNTOPT_PQUOTA) ||
 101                            !strcmp(this_char, MNTOPT_PRJQUOTA)) {
 102                         args->flags |= XFSMNT_PQUOTA | XFSMNT_PQUOTAENF;
 103                         referenced = 1;
 104                 } else if (!strcmp(this_char, MNTOPT_PQUOTANOENF)) {
 105                         args->flags |= XFSMNT_PQUOTA;
 106                         args->flags &= ~XFSMNT_PQUOTAENF;
 107                         referenced = 1;
 108                 } else if (!strcmp(this_char, MNTOPT_GQUOTA) ||
 109                            !strcmp(this_char, MNTOPT_GRPQUOTA)) {
 110                         args->flags |= XFSMNT_GQUOTA | XFSMNT_GQUOTAENF;
 111                         referenced = 1;
 112                 } else if (!strcmp(this_char, MNTOPT_GQUOTANOENF)) {
 113                         args->flags |= XFSMNT_GQUOTA;
 114                         args->flags &= ~XFSMNT_GQUOTAENF;
 115                         referenced = 1;
 116                 } else {
 117                         if (local_options)
 118                                 *(local_options-1) = ',';
 119                         continue;
 120                 }
 121
 122                 while (length--)
 123                         *this_char++ = ',';
 124         }
 125
 126         if ((args->flags & XFSMNT_GQUOTA) && (args->flags & XFSMNT_PQUOTA)) {
 127                 cmn_err(CE_WARN,
 128                         "XFS: cannot mount with both project and group quota");
 129                 return XFS_ERROR(EINVAL);
 130         }
 131
 132         error = bhv_next_vfs_parseargs(BHV_NEXT(bhv), options, args, update);
 133         if (!error && !referenced)
 134                 bhv_remove_vfsops(bhvtovfs(bhv), VFS_POSITION_QM);
 135         return error;
 136 }
 137
 138 STATIC int
 139 xfs_qm_showargs(
 140         struct bhv_desc         *bhv,
 141         struct seq_file         *m)
 142 {
 143         struct bhv_vfs          *vfsp = bhvtovfs(bhv);
 144         struct xfs_mount        *mp = XFS_VFSTOM(vfsp);
 145
 146         if (mp->m_qflags & XFS_UQUOTA_ACCT) {
 147                 (mp->m_qflags & XFS_UQUOTA_ENFD) ?
 148                         seq_puts(m, "," MNTOPT_USRQUOTA) :
 149                         seq_puts(m, "," MNTOPT_UQUOTANOENF);
 150         }
 151
 152         if (mp->m_qflags & XFS_PQUOTA_ACCT) {
 153                 (mp->m_qflags & XFS_OQUOTA_ENFD) ?
 154                         seq_puts(m, "," MNTOPT_PRJQUOTA) :
 155                         seq_puts(m, "," MNTOPT_PQUOTANOENF);
 156         }
 157
 158         if (mp->m_qflags & XFS_GQUOTA_ACCT) {
 159                 (mp->m_qflags & XFS_OQUOTA_ENFD) ?
 160                         seq_puts(m, "," MNTOPT_GRPQUOTA) :
 161                         seq_puts(m, "," MNTOPT_GQUOTANOENF);
 162         }
 163
 164         if (!(mp->m_qflags & XFS_ALL_QUOTA_ACCT))
 165                 seq_puts(m, "," MNTOPT_NOQUOTA);
 166
 167         return bhv_next_vfs_showargs(BHV_NEXT(bhv), m);
 168 }
 169
 170 STATIC int
 171 xfs_qm_mount(
 172         struct bhv_desc         *bhv,
 173         struct xfs_mount_args   *args,
 174         struct cred             *cr)
 175 {
 176         struct bhv_vfs          *vfsp = bhvtovfs(bhv);
 177         struct xfs_mount        *mp = XFS_VFSTOM(vfsp);
 178
 179         if (args->flags & (XFSMNT_UQUOTA | XFSMNT_GQUOTA | XFSMNT_PQUOTA))
 180                 xfs_qm_mount_quotainit(mp, args->flags);
 181         return bhv_next_vfs_mount(BHV_NEXT(bhv), args, cr);
 182 }
 183
 184 /*
 185  * Directory tree accounting is implemented using project quotas, where
 186  * the project identifier is inherited from parent directories.
 187  * A statvfs (df, etc.) of a directory that is using project quota should
 188  * return a statvfs of the project, not the entire filesystem.
 189  * This makes such trees appear as if they are filesystems in themselves.
 190  */
 191 STATIC int
 192 xfs_qm_statvfs(
 193         struct bhv_desc         *bhv,
 194         bhv_statvfs_t           *statp,
 195         struct bhv_vnode        *vnode)
 196 {
 197         xfs_mount_t             *mp;
 198         xfs_inode_t             *ip;
 199         xfs_dquot_t             *dqp;
 200         xfs_disk_dquot_t        *dp;
 201         __uint64_t              limit;
 202         int                     error;
 203
 204         error = bhv_next_vfs_statvfs(BHV_NEXT(bhv), statp, vnode);
 205         if (error || !vnode)
 206                 return error;
 207
 208         mp = XFS_BHVTOM(bhv);
 209         ip = xfs_vtoi(vnode);
 210
 211         if (!(ip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT))
 212                 return 0;
 213         if (!(mp->m_qflags & XFS_PQUOTA_ACCT))
 214                 return 0;
 215         if (!(mp->m_qflags & XFS_OQUOTA_ENFD))
 216                 return 0;
 217
 218         if (xfs_qm_dqget(mp, NULL, ip->i_d.di_projid, XFS_DQ_PROJ, 0, &dqp))
 219                 return 0;
 220         dp = &dqp->q_core;
 221
 222         limit = dp->d_blk_softlimit ? dp->d_blk_softlimit : dp->d_blk_hardlimit;
 223         if (limit && statp->f_blocks > limit) {
 224                 statp->f_blocks = limit;
 225                 statp->f_bfree = (statp->f_blocks > dp->d_bcount) ?
 226                                         (statp->f_blocks - dp->d_bcount) : 0;
 227         }
 228         limit = dp->d_ino_softlimit ? dp->d_ino_softlimit : dp->d_ino_hardlimit;
 229         if (limit && statp->f_files > limit) {
 230                 statp->f_files = limit;
 231                 statp->f_ffree = (statp->f_files > dp->d_icount) ?
 232                                         (statp->f_ffree - dp->d_icount) : 0;
 233         }
 234
 235         xfs_qm_dqput(dqp);
 236         return 0;
 237 }
 238
 239 STATIC int
 240 xfs_qm_syncall(
 241         struct bhv_desc         *bhv,
 242         int                     flags,
 243         cred_t                  *credp)
 244 {
 245         struct bhv_vfs          *vfsp = bhvtovfs(bhv);
 246         struct xfs_mount        *mp = XFS_VFSTOM(vfsp);
 247         int                     error;
 248
 249         /*
 250          * Get the Quota Manager to flush the dquots.
 251          */
 252         if (XFS_IS_QUOTA_ON(mp)) {
 253                 if ((error = xfs_qm_sync(mp, flags))) {
 254                         /*
 255                          * If we got an IO error, we will be shutting down.
 256                          * So, there's nothing more for us to do here.
 257                          */
 258                         ASSERT(error != EIO || XFS_FORCED_SHUTDOWN(mp));
 259                         if (XFS_FORCED_SHUTDOWN(mp)) {
 260                                 return XFS_ERROR(error);
 261                         }
 262                 }
 263         }
 264         return bhv_next_vfs_sync(BHV_NEXT(bhv), flags, credp);
 265 }
 266
 267 STATIC int
 268 xfs_qm_newmount(
 269         xfs_mount_t     *mp,
 270         uint            *needquotamount,
 271         uint            *quotaflags)
 272 {
 273         uint            quotaondisk;
 274         uint            uquotaondisk = 0, gquotaondisk = 0, pquotaondisk = 0;
 275
 276         *quotaflags = 0;
 277         *needquotamount = B_FALSE;
 278
 279         quotaondisk = XFS_SB_VERSION_HASQUOTA(&mp->m_sb) &&
 280                                 (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_ACCT);
 281
 282         if (quotaondisk) {
 283                 uquotaondisk = mp->m_sb.sb_qflags & XFS_UQUOTA_ACCT;
 284                 pquotaondisk = mp->m_sb.sb_qflags & XFS_PQUOTA_ACCT;
 285                 gquotaondisk = mp->m_sb.sb_qflags & XFS_GQUOTA_ACCT;
 286         }
 287
 288         /*
 289          * If the device itself is read-only, we can't allow
 290          * the user to change the state of quota on the mount -
 291          * this would generate a transaction on the ro device,
 292          * which would lead to an I/O error and shutdown
 293          */
 294
 295         if (((uquotaondisk && !XFS_IS_UQUOTA_ON(mp)) ||
 296             (!uquotaondisk &&  XFS_IS_UQUOTA_ON(mp)) ||
 297              (pquotaondisk && !XFS_IS_PQUOTA_ON(mp)) ||
 298             (!pquotaondisk &&  XFS_IS_PQUOTA_ON(mp)) ||
 299              (gquotaondisk && !XFS_IS_GQUOTA_ON(mp)) ||
 300             (!gquotaondisk &&  XFS_IS_OQUOTA_ON(mp)))  &&
 301             xfs_dev_is_read_only(mp, "changing quota state")) {
 302                 cmn_err(CE_WARN,
 303                         "XFS: please mount with%s%s%s%s.",
 304                         (!quotaondisk ? "out quota" : ""),
 305                         (uquotaondisk ? " usrquota" : ""),
 306                         (pquotaondisk ? " prjquota" : ""),
 307                         (gquotaondisk ? " grpquota" : ""));
 308                 return XFS_ERROR(EPERM);
 309         }
 310
 311         if (XFS_IS_QUOTA_ON(mp) || quotaondisk) {
 312                 /*
 313                  * Call mount_quotas at this point only if we won't have to do
 314                  * a quotacheck.
 315                  */
 316                 if (quotaondisk && !XFS_QM_NEED_QUOTACHECK(mp)) {
 317                         /*
 318                          * If an error occured, qm_mount_quotas code
 319                          * has already disabled quotas. So, just finish
 320                          * mounting, and get on with the boring life
 321                          * without disk quotas.
 322                          */
 323                         xfs_qm_mount_quotas(mp, 0);
 324                 } else {
 325                         /*
 326                          * Clear the quota flags, but remember them. This
 327                          * is so that the quota code doesn't get invoked
 328                          * before we're ready. This can happen when an
 329                          * inode goes inactive and wants to free blocks,
 330                          * or via xfs_log_mount_finish.
 331                          */
 332                         *needquotamount = B_TRUE;
 333                         *quotaflags = mp->m_qflags;
 334                         mp->m_qflags = 0;
 335                 }
 336         }
 337
 338         return 0;
 339 }
 340
 341 STATIC int
 342 xfs_qm_endmount(
 343         xfs_mount_t     *mp,
 344         uint            needquotamount,
 345         uint            quotaflags,
 346         int             mfsi_flags)
 347 {
 348         if (needquotamount) {
 349                 ASSERT(mp->m_qflags == 0);
 350                 mp->m_qflags = quotaflags;
 351                 xfs_qm_mount_quotas(mp, mfsi_flags);
 352         }
 353
 354 #if defined(DEBUG) && defined(XFS_LOUD_RECOVERY)
 355         if (! (XFS_IS_QUOTA_ON(mp)))
 356                 xfs_fs_cmn_err(CE_NOTE, mp, "Disk quotas not turned on");
 357         else
 358                 xfs_fs_cmn_err(CE_NOTE, mp, "Disk quotas turned on");
 359 #endif
 360
 361 #ifdef QUOTADEBUG
 362         if (XFS_IS_QUOTA_ON(mp) && xfs_qm_internalqcheck(mp))
 363                 cmn_err(CE_WARN, "XFS: mount internalqcheck failed");
 364 #endif
 365
 366         return 0;
 367 }
 368
 369 STATIC void
 370 xfs_qm_dqrele_null(
 371         xfs_dquot_t     *dq)
 372 {
 373         /*
 374          * Called from XFS, where we always check first for a NULL dquot.
 375          */
 376         if (!dq)
 377                 return;
 378         xfs_qm_dqrele(dq);
 379 }
 380
 381
 382 STATIC struct xfs_qmops xfs_qmcore_xfs = {
 383         .xfs_qminit             = xfs_qm_newmount,
 384         .xfs_qmdone             = xfs_qm_unmount_quotadestroy,
 385         .xfs_qmmount            = xfs_qm_endmount,
 386         .xfs_qmunmount          = xfs_qm_unmount_quotas,
 387         .xfs_dqrele             = xfs_qm_dqrele_null,
 388         .xfs_dqattach           = xfs_qm_dqattach,
 389         .xfs_dqdetach           = xfs_qm_dqdetach,
 390         .xfs_dqpurgeall         = xfs_qm_dqpurge_all,
 391         .xfs_dqvopalloc         = xfs_qm_vop_dqalloc,
 392         .xfs_dqvopcreate        = xfs_qm_vop_dqattach_and_dqmod_newinode,
 393         .xfs_dqvoprename        = xfs_qm_vop_rename_dqattach,
 394         .xfs_dqvopchown         = xfs_qm_vop_chown,
 395         .xfs_dqvopchownresv     = xfs_qm_vop_chown_reserve,
 396         .xfs_dqtrxops           = &xfs_trans_dquot_ops,
 397 };
 398
 399 struct bhv_module_vfsops xfs_qmops = { {
 400         BHV_IDENTITY_INIT(VFS_BHV_QM, VFS_POSITION_QM),
 401         .vfs_parseargs          = xfs_qm_parseargs,
 402         .vfs_showargs           = xfs_qm_showargs,
 403         .vfs_mount              = xfs_qm_mount,
 404         .vfs_statvfs            = xfs_qm_statvfs,
 405         .vfs_sync               = xfs_qm_syncall,
 406         .vfs_quotactl           = xfs_qm_quotactl, },
 407 };
 408
 409
 410 void __init
 411 xfs_qm_init(void)
 412 {
 413         static char     message[] __initdata =
 414                 KERN_INFO "SGI XFS Quota Management subsystem\n";
 415
 416         printk(message);
 417         mutex_init(&xfs_Gqm_lock);
 418         vfs_bhv_set_custom(&xfs_qmops, &xfs_qmcore_xfs);
 419         xfs_qm_init_procfs();
 420 }
 421
 422 void __exit
 423 xfs_qm_exit(void)
 424 {
 425         vfs_bhv_clr_custom(&xfs_qmops);
 426         xfs_qm_cleanup_procfs();
 427         if (qm_dqzone)
 428                 kmem_zone_destroy(qm_dqzone);
 429         if (qm_dqtrxzone)
 430                 kmem_zone_destroy(qm_dqtrxzone);
 431 }