[PATCH v3 4/5] libmultipath: factor out code to get vpd page data

[Benjamin Marzinski <bmarzins@xxxxxxxxxx>]

A future patch will reuse the code to get the vpd page data, so factor
it out from get_vpd_sgio().

Signed-off-by: Benjamin Marzinski <bmarzins@xxxxxxxxxx>
---
 libmultipath/discovery.c | 27 +++++++++++++++++++--------
 1 file changed, 19 insertions(+), 8 deletions(-)

diff --git a/libmultipath/discovery.c b/libmultipath/discovery.c
index add7bb97..f901e9ff 100644
--- a/libmultipath/discovery.c
+++ b/libmultipath/discovery.c
@@ -1321,14 +1321,13 @@ get_vpd_sysfs (struct udev_device *parent, int pg, char * str, int maxlen)
 	return len;
 }
 
-int
-get_vpd_sgio (int fd, int pg, int vend_id, char * str, int maxlen)
+static int
+fetch_vpd_page(int fd, int pg, unsigned char *buff, int maxlen)
 {
-	int len, buff_len;
-	unsigned char buff[4096];
+	int buff_len;
 
-	memset(buff, 0x0, 4096);
-	if (sgio_get_vpd(buff, 4096, fd, pg) < 0) {
+	memset(buff, 0x0, maxlen);
+	if (sgio_get_vpd(buff, maxlen, fd, pg) < 0) {
 		int lvl = pg == 0x80 || pg == 0x83 ? 3 : 4;
 
 		condlog(lvl, "failed to issue vpd inquiry for pg%02x",
@@ -1342,10 +1341,22 @@ get_vpd_sgio (int fd, int pg, int vend_id, char * str, int maxlen)
 		return -ENODATA;
 	}
 	buff_len = get_unaligned_be16(&buff[2]) + 4;
-	if (buff_len > 4096) {
+	if (buff_len > maxlen) {
 		condlog(3, "vpd pg%02x page truncated", pg);
-		buff_len = 4096;
+		buff_len = maxlen;
 	}
+	return buff_len;
+}
+
+int
+get_vpd_sgio (int fd, int pg, int vend_id, char * str, int maxlen)
+{
+	int len, buff_len;
+	unsigned char buff[4096];
+
+	buff_len = fetch_vpd_page(fd, pg, buff, sizeof(buff));
+	if (buff_len < 0)
+		return buff_len;
 	if (pg == 0x80)
 		len = parse_vpd_pg80(buff, str, maxlen);
 	else if (pg == 0x83)
-- 
2.17.2

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