add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/fs/ubifs/recovery.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: Adrian Hunter
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  *          Artem Bityutskiy (Битюцкий Артём)
..
..
@@ -212,7 +200,10 @@
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 	save_flags = mst->flags;
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 	mst->flags |= cpu_to_le32(UBIFS_MST_RCVRY);
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-	ubifs_prepare_node(c, mst, UBIFS_MST_NODE_SZ, 1);
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+	err = ubifs_prepare_node_hmac(c, mst, UBIFS_MST_NODE_SZ,
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+				      offsetof(struct ubifs_mst_node, hmac), 1);
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+	if (err)
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+		goto out;
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 	err = ubifs_leb_change(c, lnum, mst, sz);
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 	if (err)
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 		goto out;
..
..
@@ -264,9 +255,7 @@
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 			offs2 = (void *)mst2 - buf2;
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 			if (offs1 == offs2) {
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 				/* Same offset, so must be the same */
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-				if (memcmp((void *)mst1 + UBIFS_CH_SZ,
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-					   (void *)mst2 + UBIFS_CH_SZ,
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-					   UBIFS_MST_NODE_SZ - UBIFS_CH_SZ))
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+				if (ubifs_compare_master_node(c, mst1, mst2))
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 					goto out_err;
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 				mst = mst1;
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 			} else if (offs2 + sz == offs1) {
..
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@@ -862,7 +851,7 @@
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 		goto out_err;
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 	}
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 	if (cs_node->ch.node_type != UBIFS_CS_NODE) {
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-		ubifs_err(c, "Node a CS node, type is %d", cs_node->ch.node_type);
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+		ubifs_err(c, "Not a CS node, type is %d", cs_node->ch.node_type);
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 		goto out_err;
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 	}
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 	if (le64_to_cpu(cs_node->cmt_no) != c->cmt_no) {
..
..
@@ -1495,15 +1484,81 @@
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 }
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 /**
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+ * inode_fix_size - fix inode size
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+ * @c: UBIFS file-system description object
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+ * @e: inode size information for recovery
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+ */
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+static int inode_fix_size(struct ubifs_info *c, struct size_entry *e)
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+{
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+	struct inode *inode;
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+	struct ubifs_inode *ui;
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+	int err;
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+
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+	if (c->ro_mount)
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+		ubifs_assert(c, !e->inode);
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+
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+	if (e->inode) {
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+		/* Remounting rw, pick up inode we stored earlier */
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+		inode = e->inode;
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+	} else {
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+		inode = ubifs_iget(c->vfs_sb, e->inum);
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+		if (IS_ERR(inode))
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+			return PTR_ERR(inode);
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+
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+		if (inode->i_size >= e->d_size) {
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+			/*
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+			 * The original inode in the index already has a size
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+			 * big enough, nothing to do
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+			 */
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+			iput(inode);
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+			return 0;
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+		}
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+
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+		dbg_rcvry("ino %lu size %lld -> %lld",
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+			  (unsigned long)e->inum,
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+			  inode->i_size, e->d_size);
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+
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+		ui = ubifs_inode(inode);
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+
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+		inode->i_size = e->d_size;
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+		ui->ui_size = e->d_size;
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+		ui->synced_i_size = e->d_size;
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+
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+		e->inode = inode;
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+	}
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+
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+	/*
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+	 * In readonly mode just keep the inode pinned in memory until we go
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+	 * readwrite. In readwrite mode write the inode to the journal with the
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+	 * fixed size.
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+	 */
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+	if (c->ro_mount)
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+		return 0;
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+
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+	err = ubifs_jnl_write_inode(c, inode);
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+
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+	iput(inode);
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+
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+	if (err)
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+		return err;
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+
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+	rb_erase(&e->rb, &c->size_tree);
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+	kfree(e);
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+
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+	return 0;
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+}
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+
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+/**
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  * ubifs_recover_size - recover inode size.
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  * @c: UBIFS file-system description object
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+ * @in_place: If true, do a in-place size fixup
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  *
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  * This function attempts to fix inode size discrepancies identified by the
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  * 'ubifs_recover_size_accum()' function.
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  *
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  * This functions returns %0 on success and a negative error code on failure.
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  */
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-int ubifs_recover_size(struct ubifs_info *c)
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+int ubifs_recover_size(struct ubifs_info *c, bool in_place)
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 {
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 	struct rb_node *this = rb_first(&c->size_tree);
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@@ -1512,6 +1567,9 @@
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 		int err;
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 		e = rb_entry(this, struct size_entry, rb);
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+
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+		this = rb_next(this);
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+
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 		if (!e->exists) {
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 			union ubifs_key key;
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@@ -1535,40 +1593,26 @@
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 		}
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 		if (e->exists && e->i_size < e->d_size) {
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-			if (c->ro_mount) {
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-				/* Fix the inode size and pin it in memory */
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-				struct inode *inode;
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-				struct ubifs_inode *ui;
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+			ubifs_assert(c, !(c->ro_mount && in_place));
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-				ubifs_assert(c, !e->inode);
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+			/*
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+			 * We found data that is outside the found inode size,
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+			 * fixup the inode size
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+			 */
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1602
 
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-				inode = ubifs_iget(c->vfs_sb, e->inum);
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-				if (IS_ERR(inode))
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-					return PTR_ERR(inode);
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-
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-				ui = ubifs_inode(inode);
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-				if (inode->i_size < e->d_size) {
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-					dbg_rcvry("ino %lu size %lld -> %lld",
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-						  (unsigned long)e->inum,
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-						  inode->i_size, e->d_size);
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-					inode->i_size = e->d_size;
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-					ui->ui_size = e->d_size;
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-					ui->synced_i_size = e->d_size;
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-					e->inode = inode;
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-					this = rb_next(this);
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-					continue;
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-				}
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-				iput(inode);
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-			} else {
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-				/* Fix the size in place */
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+			if (in_place) {
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 				err = fix_size_in_place(c, e);
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 				if (err)
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 					return err;
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 				iput(e->inode);
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+			} else {
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+				err = inode_fix_size(c, e);
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+				if (err)
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+					return err;
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+				continue;
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 			}
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 		}
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-		this = rb_next(this);
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 		rb_erase(&e->rb, &c->size_tree);
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 		kfree(e);
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 	}