git.oblomov.eu Git - linux-2.6/blob - fs/xfs/quota/xfs_qm_bhv.c

   1 /*
   2  * Copyright (c) 2000-2005 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         PVFS_PARSEARGS(BHV_NEXT(bhv), options, args, update, error);
 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 vfs              *vfsp = bhvtovfs(bhv);
 144         struct xfs_mount        *mp = XFS_VFSTOM(vfsp);
 145         int                     error;
 146
 147         if (mp->m_qflags & XFS_UQUOTA_ACCT) {
 148                 (mp->m_qflags & XFS_UQUOTA_ENFD) ?
 149                         seq_puts(m, "," MNTOPT_USRQUOTA) :
 150                         seq_puts(m, "," MNTOPT_UQUOTANOENF);
 151         }
 152
 153         if (mp->m_qflags & XFS_PQUOTA_ACCT) {
 154                 (mp->m_qflags & XFS_OQUOTA_ENFD) ?
 155                         seq_puts(m, "," MNTOPT_PRJQUOTA) :
 156                         seq_puts(m, "," MNTOPT_PQUOTANOENF);
 157         }
 158
 159         if (mp->m_qflags & XFS_GQUOTA_ACCT) {
 160                 (mp->m_qflags & XFS_OQUOTA_ENFD) ?
 161                         seq_puts(m, "," MNTOPT_GRPQUOTA) :
 162                         seq_puts(m, "," MNTOPT_GQUOTANOENF);
 163         }
 164
 165         if (!(mp->m_qflags & XFS_ALL_QUOTA_ACCT))
 166                 seq_puts(m, "," MNTOPT_NOQUOTA);
 167
 168         PVFS_SHOWARGS(BHV_NEXT(bhv), m, error);
 169         return error;
 170 }
 171
 172 STATIC int
 173 xfs_qm_mount(
 174         struct bhv_desc         *bhv,
 175         struct xfs_mount_args   *args,
 176         struct cred             *cr)
 177 {
 178         struct vfs              *vfsp = bhvtovfs(bhv);
 179         struct xfs_mount        *mp = XFS_VFSTOM(vfsp);
 180         int                     error;
 181
 182         if (args->flags & (XFSMNT_UQUOTA | XFSMNT_GQUOTA | XFSMNT_PQUOTA))
 183                 xfs_qm_mount_quotainit(mp, args->flags);
 184         PVFS_MOUNT(BHV_NEXT(bhv), args, cr, error);
 185         return error;
 186 }
 187
 188 STATIC int
 189 xfs_qm_syncall(
 190         struct bhv_desc         *bhv,
 191         int                     flags,
 192         cred_t                  *credp)
 193 {
 194         struct vfs              *vfsp = bhvtovfs(bhv);
 195         struct xfs_mount        *mp = XFS_VFSTOM(vfsp);
 196         int                     error;
 197
 198         /*
 199          * Get the Quota Manager to flush the dquots.
 200          */
 201         if (XFS_IS_QUOTA_ON(mp)) {
 202                 if ((error = xfs_qm_sync(mp, flags))) {
 203                         /*
 204                          * If we got an IO error, we will be shutting down.
 205                          * So, there's nothing more for us to do here.
 206                          */
 207                         ASSERT(error != EIO || XFS_FORCED_SHUTDOWN(mp));
 208                         if (XFS_FORCED_SHUTDOWN(mp)) {
 209                                 return XFS_ERROR(error);
 210                         }
 211                 }
 212         }
 213         PVFS_SYNC(BHV_NEXT(bhv), flags, credp, error);
 214         return error;
 215 }
 216
 217 STATIC int
 218 xfs_qm_newmount(
 219         xfs_mount_t     *mp,
 220         uint            *needquotamount,
 221         uint            *quotaflags)
 222 {
 223         uint            quotaondisk;
 224         uint            uquotaondisk = 0, gquotaondisk = 0, pquotaondisk = 0;
 225
 226         *quotaflags = 0;
 227         *needquotamount = B_FALSE;
 228
 229         quotaondisk = XFS_SB_VERSION_HASQUOTA(&mp->m_sb) &&
 230                                 (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_ACCT);
 231
 232         if (quotaondisk) {
 233                 uquotaondisk = mp->m_sb.sb_qflags & XFS_UQUOTA_ACCT;
 234                 pquotaondisk = mp->m_sb.sb_qflags & XFS_PQUOTA_ACCT;
 235                 gquotaondisk = mp->m_sb.sb_qflags & XFS_GQUOTA_ACCT;
 236         }
 237
 238         /*
 239          * If the device itself is read-only, we can't allow
 240          * the user to change the state of quota on the mount -
 241          * this would generate a transaction on the ro device,
 242          * which would lead to an I/O error and shutdown
 243          */
 244
 245         if (((uquotaondisk && !XFS_IS_UQUOTA_ON(mp)) ||
 246             (!uquotaondisk &&  XFS_IS_UQUOTA_ON(mp)) ||
 247              (pquotaondisk && !XFS_IS_PQUOTA_ON(mp)) ||
 248             (!pquotaondisk &&  XFS_IS_PQUOTA_ON(mp)) ||
 249              (gquotaondisk && !XFS_IS_GQUOTA_ON(mp)) ||
 250             (!gquotaondisk &&  XFS_IS_OQUOTA_ON(mp)))  &&
 251             xfs_dev_is_read_only(mp, "changing quota state")) {
 252                 cmn_err(CE_WARN,
 253                         "XFS: please mount with%s%s%s%s.",
 254                         (!quotaondisk ? "out quota" : ""),
 255                         (uquotaondisk ? " usrquota" : ""),
 256                         (pquotaondisk ? " prjquota" : ""),
 257                         (gquotaondisk ? " grpquota" : ""));
 258                 return XFS_ERROR(EPERM);
 259         }
 260
 261         if (XFS_IS_QUOTA_ON(mp) || quotaondisk) {
 262                 /*
 263                  * Call mount_quotas at this point only if we won't have to do
 264                  * a quotacheck.
 265                  */
 266                 if (quotaondisk && !XFS_QM_NEED_QUOTACHECK(mp)) {
 267                         /*
 268                          * If an error occured, qm_mount_quotas code
 269                          * has already disabled quotas. So, just finish
 270                          * mounting, and get on with the boring life
 271                          * without disk quotas.
 272                          */
 273                         xfs_qm_mount_quotas(mp, 0);
 274                 } else {
 275                         /*
 276                          * Clear the quota flags, but remember them. This
 277                          * is so that the quota code doesn't get invoked
 278                          * before we're ready. This can happen when an
 279                          * inode goes inactive and wants to free blocks,
 280                          * or via xfs_log_mount_finish.
 281                          */
 282                         *needquotamount = B_TRUE;
 283                         *quotaflags = mp->m_qflags;
 284                         mp->m_qflags = 0;
 285                 }
 286         }
 287
 288         return 0;
 289 }
 290
 291 STATIC int
 292 xfs_qm_endmount(
 293         xfs_mount_t     *mp,
 294         uint            needquotamount,
 295         uint            quotaflags,
 296         int             mfsi_flags)
 297 {
 298         if (needquotamount) {
 299                 ASSERT(mp->m_qflags == 0);
 300                 mp->m_qflags = quotaflags;
 301                 xfs_qm_mount_quotas(mp, mfsi_flags);
 302         }
 303
 304 #if defined(DEBUG) && defined(XFS_LOUD_RECOVERY)
 305         if (! (XFS_IS_QUOTA_ON(mp)))
 306                 xfs_fs_cmn_err(CE_NOTE, mp, "Disk quotas not turned on");
 307         else
 308                 xfs_fs_cmn_err(CE_NOTE, mp, "Disk quotas turned on");
 309 #endif
 310
 311 #ifdef QUOTADEBUG
 312         if (XFS_IS_QUOTA_ON(mp) && xfs_qm_internalqcheck(mp))
 313                 cmn_err(CE_WARN, "XFS: mount internalqcheck failed");
 314 #endif
 315
 316         return 0;
 317 }
 318
 319 STATIC void
 320 xfs_qm_dqrele_null(
 321         xfs_dquot_t     *dq)
 322 {
 323         /*
 324          * Called from XFS, where we always check first for a NULL dquot.
 325          */
 326         if (!dq)
 327                 return;
 328         xfs_qm_dqrele(dq);
 329 }
 330
 331
 332 STATIC struct xfs_qmops xfs_qmcore_xfs = {
 333         .xfs_qminit             = xfs_qm_newmount,
 334         .xfs_qmdone             = xfs_qm_unmount_quotadestroy,
 335         .xfs_qmmount            = xfs_qm_endmount,
 336         .xfs_qmunmount          = xfs_qm_unmount_quotas,
 337         .xfs_dqrele             = xfs_qm_dqrele_null,
 338         .xfs_dqattach           = xfs_qm_dqattach,
 339         .xfs_dqdetach           = xfs_qm_dqdetach,
 340         .xfs_dqpurgeall         = xfs_qm_dqpurge_all,
 341         .xfs_dqvopalloc         = xfs_qm_vop_dqalloc,
 342         .xfs_dqvopcreate        = xfs_qm_vop_dqattach_and_dqmod_newinode,
 343         .xfs_dqvoprename        = xfs_qm_vop_rename_dqattach,
 344         .xfs_dqvopchown         = xfs_qm_vop_chown,
 345         .xfs_dqvopchownresv     = xfs_qm_vop_chown_reserve,
 346         .xfs_dqtrxops           = &xfs_trans_dquot_ops,
 347 };
 348
 349 struct bhv_vfsops xfs_qmops = { {
 350         BHV_IDENTITY_INIT(VFS_BHV_QM, VFS_POSITION_QM),
 351         .vfs_parseargs          = xfs_qm_parseargs,
 352         .vfs_showargs           = xfs_qm_showargs,
 353         .vfs_mount              = xfs_qm_mount,
 354         .vfs_sync               = xfs_qm_syncall,
 355         .vfs_quotactl           = xfs_qm_quotactl, },
 356 };
 357
 358
 359 void __init
 360 xfs_qm_init(void)
 361 {
 362         static char     message[] __initdata =
 363                 KERN_INFO "SGI XFS Quota Management subsystem\n";
 364
 365         printk(message);
 366         mutex_init(&xfs_Gqm_lock, MUTEX_DEFAULT, "xfs_qmlock");
 367         vfs_bhv_set_custom(&xfs_qmops, &xfs_qmcore_xfs);
 368         xfs_qm_init_procfs();
 369 }
 370
 371 void __exit
 372 xfs_qm_exit(void)
 373 {
 374         vfs_bhv_clr_custom(&xfs_qmops);
 375         xfs_qm_cleanup_procfs();
 376         if (qm_dqzone)
 377                 kmem_cache_destroy(qm_dqzone);
 378         if (qm_dqtrxzone)
 379                 kmem_cache_destroy(qm_dqtrxzone);
 380 }