1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * quota.c - NTFS kernel quota ($Quota) handling.  Part of the Linux-NTFS
  4 *	     project.
  5 *
  6 * Copyright (c) 2004 Anton Altaparmakov
  7 */
  8
  9#ifdef NTFS_RW
 10
 11#include "index.h"
 12#include "quota.h"
 13#include "debug.h"
 14#include "ntfs.h"
 15
 16/**
 17 * ntfs_mark_quotas_out_of_date - mark the quotas out of date on an ntfs volume
 18 * @vol:	ntfs volume on which to mark the quotas out of date
 19 *
 20 * Mark the quotas out of date on the ntfs volume @vol and return 'true' on
 21 * success and 'false' on error.
 22 */
 23bool ntfs_mark_quotas_out_of_date(ntfs_volume *vol)
 24{
 25	ntfs_index_context *ictx;
 26	QUOTA_CONTROL_ENTRY *qce;
 27	const le32 qid = QUOTA_DEFAULTS_ID;
 28	int err;
 29
 30	ntfs_debug("Entering.");
 31	if (NVolQuotaOutOfDate(vol))
 32		goto done;
 33	if (!vol->quota_ino || !vol->quota_q_ino) {
 34		ntfs_error(vol->sb, "Quota inodes are not open.");
 35		return false;
 36	}
 37	inode_lock(vol->quota_q_ino);
 38	ictx = ntfs_index_ctx_get(NTFS_I(vol->quota_q_ino));
 39	if (!ictx) {
 40		ntfs_error(vol->sb, "Failed to get index context.");
 41		goto err_out;
 42	}
 43	err = ntfs_index_lookup(&qid, sizeof(qid), ictx);
 44	if (err) {
 45		if (err == -ENOENT)
 46			ntfs_error(vol->sb, "Quota defaults entry is not "
 47					"present.");
 48		else
 49			ntfs_error(vol->sb, "Lookup of quota defaults entry "
 50					"failed.");
 51		goto err_out;
 52	}
 53	if (ictx->data_len < offsetof(QUOTA_CONTROL_ENTRY, sid)) {
 54		ntfs_error(vol->sb, "Quota defaults entry size is invalid.  "
 55				"Run chkdsk.");
 56		goto err_out;
 57	}
 58	qce = (QUOTA_CONTROL_ENTRY*)ictx->data;
 59	if (le32_to_cpu(qce->version) != QUOTA_VERSION) {
 60		ntfs_error(vol->sb, "Quota defaults entry version 0x%x is not "
 61				"supported.", le32_to_cpu(qce->version));
 62		goto err_out;
 63	}
 64	ntfs_debug("Quota defaults flags = 0x%x.", le32_to_cpu(qce->flags));
 65	/* If quotas are already marked out of date, no need to do anything. */
 66	if (qce->flags & QUOTA_FLAG_OUT_OF_DATE)
 67		goto set_done;
 68	/*
 69	 * If quota tracking is neither requested, nor enabled and there are no
 70	 * pending deletes, no need to mark the quotas out of date.
 71	 */
 72	if (!(qce->flags & (QUOTA_FLAG_TRACKING_ENABLED |
 73			QUOTA_FLAG_TRACKING_REQUESTED |
 74			QUOTA_FLAG_PENDING_DELETES)))
 75		goto set_done;
 76	/*
 77	 * Set the QUOTA_FLAG_OUT_OF_DATE bit thus marking quotas out of date.
 78	 * This is verified on WinXP to be sufficient to cause windows to
 79	 * rescan the volume on boot and update all quota entries.
 80	 */
 81	qce->flags |= QUOTA_FLAG_OUT_OF_DATE;
 82	/* Ensure the modified flags are written to disk. */
 83	ntfs_index_entry_flush_dcache_page(ictx);
 84	ntfs_index_entry_mark_dirty(ictx);
 85set_done:
 86	ntfs_index_ctx_put(ictx);
 87	inode_unlock(vol->quota_q_ino);
 88	/*
 89	 * We set the flag so we do not try to mark the quotas out of date
 90	 * again on remount.
 91	 */
 92	NVolSetQuotaOutOfDate(vol);
 93done:
 94	ntfs_debug("Done.");
 95	return true;
 96err_out:
 97	if (ictx)
 98		ntfs_index_ctx_put(ictx);
 99	inode_unlock(vol->quota_q_ino);
100	return false;
101}
102
103#endif /* NTFS_RW */