/*
   * quota.c - NTFS kernel quota ($Quota) handling.  Part of the Linux-NTFS
   *	     project.
   *
   * Copyright (c) 2004 Anton Altaparmakov
   *
   * This program/include file is free software; you can redistribute it and/or
   * modify it under the terms of the GNU General Public License as published
   * by the Free Software Foundation; either version 2 of the License, or
   * (at your option) any later version.
   *
   * This program/include file is distributed in the hope that it will be
   * useful, but WITHOUT ANY WARRANTY; without even the implied warranty
   * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program (in the main directory of the Linux-NTFS
   * distribution in the file COPYING); if not, write to the Free Software
   * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   */
  
  #ifdef NTFS_RW
  
  #include "index.h"
  #include "quota.h"
  #include "debug.h"
  #include "ntfs.h"
  
  /**
   * ntfs_mark_quotas_out_of_date - mark the quotas out of date on an ntfs volume
   * @vol:	ntfs volume on which to mark the quotas out of date
   *
   * Mark the quotas out of date on the ntfs volume @vol and return 'true' on
   * success and 'false' on error.
   */
  bool ntfs_mark_quotas_out_of_date(ntfs_volume *vol)
  {
  	ntfs_index_context *ictx;
  	QUOTA_CONTROL_ENTRY *qce;
  	const le32 qid = QUOTA_DEFAULTS_ID;
  	int err;
  
  	ntfs_debug("Entering.");
  	if (NVolQuotaOutOfDate(vol))
  		goto done;
  	if (!vol->quota_ino || !vol->quota_q_ino) {
  		ntfs_error(vol->sb, "Quota inodes are not open.");
  		return false;
  	}
  	mutex_lock(&vol->quota_q_ino->i_mutex);
  	ictx = ntfs_index_ctx_get(NTFS_I(vol->quota_q_ino));
  	if (!ictx) {
  		ntfs_error(vol->sb, "Failed to get index context.");
  		goto err_out;
  	}
  	err = ntfs_index_lookup(&qid, sizeof(qid), ictx);
  	if (err) {
  		if (err == -ENOENT)
  			ntfs_error(vol->sb, "Quota defaults entry is not "
  					"present.");
  		else
  			ntfs_error(vol->sb, "Lookup of quota defaults entry "
  					"failed.");
  		goto err_out;
  	}
  	if (ictx->data_len < offsetof(QUOTA_CONTROL_ENTRY, sid)) {
  		ntfs_error(vol->sb, "Quota defaults entry size is invalid.  "
  				"Run chkdsk.");
  		goto err_out;
  	}
  	qce = (QUOTA_CONTROL_ENTRY*)ictx->data;
  	if (le32_to_cpu(qce->version) != QUOTA_VERSION) {
  		ntfs_error(vol->sb, "Quota defaults entry version 0x%x is not "
  				"supported.", le32_to_cpu(qce->version));
  		goto err_out;
  	}
  	ntfs_debug("Quota defaults flags = 0x%x.", le32_to_cpu(qce->flags));
  	/* If quotas are already marked out of date, no need to do anything. */
  	if (qce->flags & QUOTA_FLAG_OUT_OF_DATE)
  		goto set_done;
  	/*
  	 * If quota tracking is neither requested, nor enabled and there are no
  	 * pending deletes, no need to mark the quotas out of date.
  	 */
  	if (!(qce->flags & (QUOTA_FLAG_TRACKING_ENABLED |
  			QUOTA_FLAG_TRACKING_REQUESTED |
  			QUOTA_FLAG_PENDING_DELETES)))
  		goto set_done;
  	/*
  	 * Set the QUOTA_FLAG_OUT_OF_DATE bit thus marking quotas out of date.
  	 * This is verified on WinXP to be sufficient to cause windows to
  	 * rescan the volume on boot and update all quota entries.
  	 */
  	qce->flags |= QUOTA_FLAG_OUT_OF_DATE;
  	/* Ensure the modified flags are written to disk. */
  	ntfs_index_entry_flush_dcache_page(ictx);
  	ntfs_index_entry_mark_dirty(ictx);
  set_done:
  	ntfs_index_ctx_put(ictx);
  	mutex_unlock(&vol->quota_q_ino->i_mutex);
  	/*
  	 * We set the flag so we do not try to mark the quotas out of date
  	 * again on remount.
  	 */
  	NVolSetQuotaOutOfDate(vol);
  done:
  	ntfs_debug("Done.");
  	return true;
  err_out:
  	if (ictx)
  		ntfs_index_ctx_put(ictx);
  	mutex_unlock(&vol->quota_q_ino->i_mutex);
  	return false;
  }
  
  #endif /* NTFS_RW */