add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/fs/ubifs/log.c
..
..
@@ -1,20 +1,8 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * This file is part of UBIFS.
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  *
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  * Copyright (C) 2006-2008 Nokia Corporation.
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- *
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- * This program is free software; you can redistribute it and/or modify it
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- * under the terms of the GNU General Public License version 2 as published by
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- * the Free Software Foundation.
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- *
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- * This program is distributed in the hope that it will be useful, but WITHOUT
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- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
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- * more details.
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- *
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- * You should have received a copy of the GNU General Public License along with
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- * this program; if not, write to the Free Software Foundation, Inc., 51
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- * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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  *
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  * Authors: Artem Bityutskiy (Битюцкий Артём)
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  *          Adrian Hunter
..
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@@ -236,6 +224,7 @@
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 	bud->lnum = lnum;
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 	bud->start = offs;
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 	bud->jhead = jhead;
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+	bud->log_hash = NULL;
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 	ref->ch.node_type = UBIFS_REF_NODE;
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 	ref->lnum = cpu_to_le32(bud->lnum);
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@@ -272,6 +261,14 @@
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 		c->lhead_lnum, c->lhead_offs);
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 	err = ubifs_write_node(c, ref, UBIFS_REF_NODE_SZ, c->lhead_lnum,
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 			       c->lhead_offs);
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+	if (err)
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+		goto out_unlock;
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+
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+	err = ubifs_shash_update(c, c->log_hash, ref, UBIFS_REF_NODE_SZ);
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+	if (err)
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+		goto out_unlock;
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+
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+	err = ubifs_shash_copy_state(c, c->log_hash, c->jheads[jhead].log_hash);
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 	if (err)
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 		goto out_unlock;
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@@ -377,6 +374,14 @@
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 	cs->cmt_no = cpu_to_le64(c->cmt_no);
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 	ubifs_prepare_node(c, cs, UBIFS_CS_NODE_SZ, 0);
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+	err = ubifs_shash_init(c, c->log_hash);
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+	if (err)
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+		goto out;
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+
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+	err = ubifs_shash_update(c, c->log_hash, cs, UBIFS_CS_NODE_SZ);
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+	if (err < 0)
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+		goto out;
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+
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 	/*
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 	 * Note, we do not lock 'c->log_mutex' because this is the commit start
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 	 * phase and we are exclusively using the log. And we do not lock
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@@ -402,6 +407,12 @@
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 		ubifs_prepare_node(c, ref, UBIFS_REF_NODE_SZ, 0);
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 		len += UBIFS_REF_NODE_SZ;
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+
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+		err = ubifs_shash_update(c, c->log_hash, ref,
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+					 UBIFS_REF_NODE_SZ);
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+		if (err)
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+			goto out;
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+		ubifs_shash_copy_state(c, c->log_hash, c->jheads[i].log_hash);
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 	}
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 	ubifs_pad(c, buf + len, ALIGN(len, c->min_io_size) - len);
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@@ -427,10 +438,7 @@
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 	*ltail_lnum = c->lhead_lnum;
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 	c->lhead_offs += len;
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-	if (c->lhead_offs == c->leb_size) {
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-		c->lhead_lnum = ubifs_next_log_lnum(c, c->lhead_lnum);
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-		c->lhead_offs = 0;
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-	}
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+	ubifs_assert(c, c->lhead_offs < c->leb_size);
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 	remove_buds(c);
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@@ -516,6 +524,7 @@
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 		if (err)
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 			return err;
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 		list_del(&bud->list);
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+		kfree(bud->log_hash);
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 		kfree(bud);
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 	}
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 	mutex_lock(&c->log_mutex);