The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/fs/ntfs/quota.c

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    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   31  * ntfs_mark_quotas_out_of_date - mark the quotas out of date on an ntfs volume
   32  * @vol:        ntfs volume on which to mark the quotas out of date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   34  * Mark the quotas out of date on the ntfs volume @vol and return 'true' on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 */

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