LXR linux/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  31 * ntfs_mark_quotas_out_of_date - mark the quotas out of date on an ntfs volume
  32 * @vol:        ntfs volume on which to mark the quotas out of date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  34 * Mark the quotas out of date on the ntfs volume @vol and return 'true' on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 */
  37bool 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);
  99set_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);
 107done:
 108        ntfs_debug("Done.");
 109        return true;
 110err_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 */
 118