From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001
From: André Fabian Silva Delgado <emulatorman@parabola.nu>
Date: Wed, 5 Aug 2015 17:04:01 -0300
Subject: Initial import

---
 fs/ntfs/quota.c | 117 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 117 insertions(+)
 create mode 100644 fs/ntfs/quota.c

(limited to 'fs/ntfs/quota.c')

diff --git a/fs/ntfs/quota.c b/fs/ntfs/quota.c
new file mode 100644
index 000000000..d80e3315c
--- /dev/null
+++ b/fs/ntfs/quota.c
@@ -0,0 +1,117 @@
+/*
+ * 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+ * ntfs_mark_quotas_out_of_date - mark the quotas out of date on an ntfs volume
+ * @vol:	ntfs volume on which to mark the quotas out of date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+ * Mark the quotas out of date on the ntfs volume @vol and return 'true' on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 */
-- 
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