fs/ntfs/quota.c

   1 /*
   2  * quota.c - NTFS kernel quota ($Quota) handling.  Part of the Linux-NTFS
   3  *           project.
   4  *
   5  * Copyright (c) 2004 Anton Altaparmakov
   6  *
   7  * This program/include file is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License as published
   9  * by the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program/include file is distributed in the hope that it will be
  13  * useful, but WITHOUT ANY WARRANTY; without even the implied warranty
  14  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program (in the main directory of the Linux-NTFS
  19  * distribution in the file COPYING); if not, write to the Free Software
  20  * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  */
  22
  23 #ifdef NTFS_RW
  24
  25 #include "index.h"
  26 #include "quota.h"
  27 #include "debug.h"
  28 #include "ntfs.h"
  29
  30 /**
  31  * ntfs_mark_quotas_out_of_date - mark the quotas out of date on an ntfs volume
  32  * @vol:        ntfs volume on which to mark the quotas out of date
  33  *
  34  * Mark the quotas out of date on the ntfs volume @vol and return 'true' on
  35  * success and 'false' on error.
  36  */
  37 bool ntfs_mark_quotas_out_of_date(ntfs_volume *vol)
  38 {
  39         ntfs_index_context *ictx;
  40         QUOTA_CONTROL_ENTRY *qce;
  41         const le32 qid = QUOTA_DEFAULTS_ID;
  42         int err;
  43
  44         ntfs_debug("Entering.");
  45         if (NVolQuotaOutOfDate(vol))
  46                 goto done;
  47         if (!vol->quota_ino || !vol->quota_q_ino) {
  48                 ntfs_error(vol->sb, "Quota inodes are not open.");
  49                 return false;
  50         }
  51         mutex_lock(&vol->quota_q_ino->i_mutex);
  52         ictx = ntfs_index_ctx_get(NTFS_I(vol->quota_q_ino));
  53         if (!ictx) {
  54                 ntfs_error(vol->sb, "Failed to get index context.");
  55                 goto err_out;
  56         }
  57         err = ntfs_index_lookup(&qid, sizeof(qid), ictx);
  58         if (err) {
  59                 if (err == -ENOENT)
  60                         ntfs_error(vol->sb, "Quota defaults entry is not "
  61                                         "present.");
  62                 else
  63                         ntfs_error(vol->sb, "Lookup of quota defaults entry "
  64                                         "failed.");
  65                 goto err_out;
  66         }
  67         if (ictx->data_len < offsetof(QUOTA_CONTROL_ENTRY, sid)) {
  68                 ntfs_error(vol->sb, "Quota defaults entry size is invalid.  "
  69                                 "Run chkdsk.");
  70                 goto err_out;
  71         }
  72         qce = (QUOTA_CONTROL_ENTRY*)ictx->data;
  73         if (le32_to_cpu(qce->version) != QUOTA_VERSION) {
  74                 ntfs_error(vol->sb, "Quota defaults entry version 0x%x is not "
  75                                 "supported.", le32_to_cpu(qce->version));
  76                 goto err_out;
  77         }
  78         ntfs_debug("Quota defaults flags = 0x%x.", le32_to_cpu(qce->flags));
  79         /* If quotas are already marked out of date, no need to do anything. */
  80         if (qce->flags & QUOTA_FLAG_OUT_OF_DATE)
  81                 goto set_done;
  82         /*
  83          * If quota tracking is neither requested, nor enabled and there are no
  84          * pending deletes, no need to mark the quotas out of date.
  85          */
  86         if (!(qce->flags & (QUOTA_FLAG_TRACKING_ENABLED |
  87                         QUOTA_FLAG_TRACKING_REQUESTED |
  88                         QUOTA_FLAG_PENDING_DELETES)))
  89                 goto set_done;
  90         /*
  91          * Set the QUOTA_FLAG_OUT_OF_DATE bit thus marking quotas out of date.
  92          * This is verified on WinXP to be sufficient to cause windows to
  93          * rescan the volume on boot and update all quota entries.
  94          */
  95         qce->flags |= QUOTA_FLAG_OUT_OF_DATE;
  96         /* Ensure the modified flags are written to disk. */
  97         ntfs_index_entry_flush_dcache_page(ictx);
  98         ntfs_index_entry_mark_dirty(ictx);
  99 set_done:
 100         ntfs_index_ctx_put(ictx);
 101         mutex_unlock(&vol->quota_q_ino->i_mutex);
 102         /*
 103          * We set the flag so we do not try to mark the quotas out of date
 104          * again on remount.
 105          */
 106         NVolSetQuotaOutOfDate(vol);
 107 done:
 108         ntfs_debug("Done.");
 109         return true;
 110 err_out:
 111         if (ictx)
 112                 ntfs_index_ctx_put(ictx);
 113         mutex_unlock(&vol->quota_q_ino->i_mutex);
 114         return false;
 115 }
 116
 117 #endif /* NTFS_RW */