pstore: Create common record initializer

In preparation for setting timestamps in the pstore core, create a common
initializer routine, instead of using static initializers.
Signed-off-by: Kees Cook <keescook@chromium.org>

fs/pstore/internal.h

@@ -30,5 +30,7 @@ extern void	pstore_get_backend_records(struct pstore_info *psi,
 extern int	pstore_mkfile(struct dentry *root,
 			      struct pstore_record *record);
 extern bool	pstore_is_mounted(void);
+extern void	pstore_record_init(struct pstore_record *record,
+				   struct pstore_info *psi);
 
 #endif

fs/pstore/platform.c

@@ -474,6 +474,14 @@ static size_t copy_kmsg_to_buffer(int hsize, size_t len)
 	return total_len;
 }
 
+void pstore_record_init(struct pstore_record *record,
+			struct pstore_info *psinfo)
+{
+	memset(record, 0, sizeof(*record));
+
+	record->psi = psinfo;
+}
+
 /*
  * callback from kmsg_dump. (s2,l2) has the most recently
  * written bytes, older bytes are in (s1,l1). Save as much
@@ -509,15 +517,14 @@ static void pstore_dump(struct kmsg_dumper *dumper,
 		int header_size;
 		int zipped_len = -1;
 		size_t dump_size;
-		struct pstore_record record = {
-			.type = PSTORE_TYPE_DMESG,
-			.count = oopscount,
-			.reason = reason,
-			.part = part,
-			.compressed = false,
-			.buf = psinfo->buf,
-			.psi = psinfo,
-		};
+		struct pstore_record record;
+
+		pstore_record_init(&record, psinfo);
+		record.type = PSTORE_TYPE_DMESG;
+		record.count = oopscount;
+		record.reason = reason;
+		record.part = part;
+		record.buf = psinfo->buf;
 
 		if (big_oops_buf && is_locked) {
 			dst = big_oops_buf;
@@ -587,12 +594,12 @@ static void pstore_console_write(struct console *con, const char *s, unsigned c)
 	const char *e = s + c;
 
 	while (s < e) {
-		struct pstore_record record = {
-			.type = PSTORE_TYPE_CONSOLE,
-			.psi = psinfo,
-		};
+		struct pstore_record record;
 		unsigned long flags;
 
+		pstore_record_init(&record, psinfo);
+		record.type = PSTORE_TYPE_CONSOLE;
+
 		if (c > psinfo->bufsize)
 			c = psinfo->bufsize;
 
@@ -845,7 +852,7 @@ void pstore_get_backend_records(struct pstore_info *psi,
 			pr_err("out of memory creating record\n");
 			break;
 		}
-		record->psi = psi;
+		pstore_record_init(record, psi);
 
 		record->size = psi->read(record);
 

fs/pstore/pmsg.c

@@ -22,16 +22,16 @@ static DEFINE_MUTEX(pmsg_lock);
 static ssize_t write_pmsg(struct file *file, const char __user *buf,
 			  size_t count, loff_t *ppos)
 {
-	struct pstore_record record = {
-		.type = PSTORE_TYPE_PMSG,
-		.size = count,
-		.psi = psinfo,
-	};
+	struct pstore_record record;
 	int ret;
 
 	if (!count)
 		return 0;
 
+	pstore_record_init(&record, psinfo);
+	record.type = PSTORE_TYPE_PMSG;
+	record.size = count;
+
 	/* check outside lock, page in any data. write_user also checks */
 	if (!access_ok(VERIFY_READ, buf, count))
 		return -EFAULT;