ext4: prevent getting empty inode buffer

hulk inclusion
category: bugfix
bugzilla: 174653 https://gitee.com/openeuler/kernel/issues/I4DDEL
---------------------------

In ext4_get_inode_loc(), we may skip IO and get an zero && uptodate
inode buffer when the inode monopolize an inode block for performance
reason. For most cases, ext4_mark_iloc_dirty() will fill the inode
buffer to make it fine, but we could miss this call if something bad
happened. Finally, __ext4_get_inode_loc_noinmem() may probably get an
empty inode buffer and trigger ext4 error.

For example, if we remove a nonexistent xattr on inode A,
ext4_xattr_set_handle() will return ENODATA before invoking
ext4_mark_iloc_dirty(), it will left an uptodate but zero buffer. We
will get checksum error message in ext4_iget() when getting inode again.

  EXT4-fs error (device sda): ext4_lookup:1784: inode #131074: comm cat: iget: checksum invalid

Even worse, if we allocate another inode B at the same inode block, it
will corrupt the inode A on disk when write back inode B.

So this patch initialize the inode buffer by filling the in-mem inode
contents if we skip read I/O, ensure that the buffer is really uptodate.
Signed-off-by: NZhang Yi <yi.zhang@huawei.com>
Reviewed-by: NYang Erkun <yangerkun@huawei.com>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

fs/ext4/inode.c

@@ -4445,12 +4445,12 @@ static int ext4_fill_raw_inode(struct inode *inode, struct ext4_inode *raw_inode
 
 /*
  * ext4_get_inode_loc returns with an extra refcount against the inode's
- * underlying buffer_head on success. If 'in_mem' is true, we have all
- * data in memory that is needed to recreate the on-disk version of this
- * inode.
+ * underlying buffer_head on success. If we pass 'inode' and it does not
+ * have in-inode xattr, we have all inode data in memory that is needed
+ * to recreate the on-disk version of this inode.
  */
 static int __ext4_get_inode_loc(struct super_block *sb, unsigned long ino,
-				struct ext4_iloc *iloc, int in_mem,
+				struct inode *inode, struct ext4_iloc *iloc,
 				ext4_fsblk_t *ret_block)
 {
 	struct ext4_group_desc	*gdp;
@@ -4495,7 +4495,7 @@ static int __ext4_get_inode_loc(struct super_block *sb, unsigned long ino,
 		 * is the only valid inode in the block, we need not read the
 		 * block.
 		 */
-		if (in_mem) {
+		if (inode && !ext4_test_inode_state(inode, EXT4_STATE_XATTR)) {
 			struct buffer_head *bitmap_bh;
 			int i, start;
 
@@ -4523,8 +4523,13 @@ static int __ext4_get_inode_loc(struct super_block *sb, unsigned long ino,
 			}
 			brelse(bitmap_bh);
 			if (i == start + inodes_per_block) {
+				struct ext4_inode *raw_inode =
+					(struct ext4_inode *) (bh->b_data + iloc->offset);
+
 				/* all other inodes are free, so skip I/O */
 				memset(bh->b_data, 0, bh->b_size);
+				if (!ext4_test_inode_state(inode, EXT4_STATE_NEW))
+					ext4_fill_raw_inode(inode, raw_inode);
 				set_buffer_uptodate(bh);
 				unlock_buffer(bh);
 				goto has_buffer;
@@ -4586,7 +4591,7 @@ static int __ext4_get_inode_loc_noinmem(struct inode *inode,
 	ext4_fsblk_t err_blk;
 	int ret;
 
-	ret = __ext4_get_inode_loc(inode->i_sb, inode->i_ino, iloc, 0,
+	ret = __ext4_get_inode_loc(inode->i_sb, inode->i_ino, NULL, iloc,
 					&err_blk);
 
 	if (ret == -EIO)
@@ -4601,9 +4606,8 @@ int ext4_get_inode_loc(struct inode *inode, struct ext4_iloc *iloc)
 	ext4_fsblk_t err_blk;
 	int ret;
 
-	/* We have all inode data except xattrs in memory here. */
-	ret = __ext4_get_inode_loc(inode->i_sb, inode->i_ino, iloc,
-		!ext4_test_inode_state(inode, EXT4_STATE_XATTR), &err_blk);
+	ret = __ext4_get_inode_loc(inode->i_sb, inode->i_ino, inode, iloc,
+					&err_blk);
 
 	if (ret == -EIO)
 		ext4_error_inode_block(inode, err_blk, EIO,
@@ -4616,7 +4620,7 @@ int ext4_get_inode_loc(struct inode *inode, struct ext4_iloc *iloc)
 int ext4_get_fc_inode_loc(struct super_block *sb, unsigned long ino,
 			  struct ext4_iloc *iloc)
 {
-	return __ext4_get_inode_loc(sb, ino, iloc, 0, NULL);
+	return __ext4_get_inode_loc(sb, ino, NULL, iloc, NULL);
 }
 
 static bool ext4_should_enable_dax(struct inode *inode)