Instead of always calling uid_fallback() if the configured method to get
the uid failed, get_uid now checks if the path supports fallbacks and if
all the retriggers have occurred. If so, it calls uid_fallback(), which
just attempts to get the uid using the appropriate fallback method. None
of these changes should make the code function any differently.
Signed-off-by: Benjamin Marzinski <bmarzins@xxxxxxxxxx>
---
libmultipath/discovery.c | 85 ++++++++++++++++++++++------------------
1 file changed, 46 insertions(+), 39 deletions(-)
diff --git a/libmultipath/discovery.c b/libmultipath/discovery.c
index bece67c..3ec60d6 100644
--- a/libmultipath/discovery.c
+++ b/libmultipath/discovery.c
@@ -1755,50 +1755,50 @@ get_vpd_uid(struct path * pp)
}
static ssize_t uid_fallback(struct path *pp, int path_state,
- const char **origin, ssize_t old_len)
+ const char **origin)
{
- ssize_t len = old_len;
- int retrigger;
- struct config *conf;
-
- conf = get_multipath_config();
- retrigger = conf->retrigger_tries;
- put_multipath_config(conf);
- if (pp->retriggers >= retrigger) {
- if (pp->bus == SYSFS_BUS_SCSI &&
- !strcmp(pp->uid_attribute, DEFAULT_UID_ATTRIBUTE)) {
- len = get_vpd_uid(pp);
- *origin = "sysfs";
- pp->uid_attribute = NULL;
- if (len < 0 && path_state == PATH_UP) {
- condlog(1, "%s: failed to get sysfs uid: %s",
- pp->dev, strerror(-len));
- len = get_vpd_sgio(pp->fd, 0x83, pp->wwid,
+ ssize_t len = -1;
+
+ if (pp->bus == SYSFS_BUS_SCSI &&
+ !strcmp(pp->uid_attribute, DEFAULT_UID_ATTRIBUTE)) {
+ len = get_vpd_uid(pp);
+ *origin = "sysfs";
+ pp->uid_attribute = NULL;
+ if (len < 0 && path_state == PATH_UP) {
+ condlog(1, "%s: failed to get sysfs uid: %s",
+ pp->dev, strerror(-len));
+ len = get_vpd_sgio(pp->fd, 0x83, pp->wwid,
+ WWID_SIZE);
+ *origin = "sgio";
+ }
+ } else if (pp->bus == SYSFS_BUS_NVME) {
+ char value[256];
+ len = sysfs_attr_get_value(pp->udev, "wwid", value,
+ sizeof(value));
+ if (len <= 0)
+ return -1;
+ len = strlcpy(pp->wwid, value, WWID_SIZE);
+ if (len >= WWID_SIZE) {
+ len = fix_broken_nvme_wwid(pp, value,
WWID_SIZE);
- *origin = "sgio";
- }
- } else if (pp->bus == SYSFS_BUS_NVME) {
- char value[256];
- len = sysfs_attr_get_value(pp->udev, "wwid", value,
- sizeof(value));
- if (len <= 0)
- return -1;
- len = strlcpy(pp->wwid, value, WWID_SIZE);
- if (len >= WWID_SIZE) {
- len = fix_broken_nvme_wwid(pp, value,
- WWID_SIZE);
- if (len > 0)
- return len;
- condlog(0, "%s: wwid overflow", pp->dev);
- len = WWID_SIZE;
- }
- *origin = "sysfs";
- pp->uid_attribute = NULL;
+ if (len > 0)
+ return len;
+ condlog(0, "%s: wwid overflow", pp->dev);
+ len = WWID_SIZE;
}
+ *origin = "sysfs";
+ pp->uid_attribute = NULL;
}
return len;
}
+static int has_uid_fallback(struct path *pp)
+{
+ return ((pp->bus == SYSFS_BUS_SCSI &&
+ !strcmp(pp->uid_attribute, DEFAULT_UID_ATTRIBUTE)) ||
+ pp->bus == SYSFS_BUS_NVME);
+}
+
int
get_uid (struct path * pp, int path_state, struct udev_device *udev)
{
@@ -1846,8 +1846,15 @@ get_uid (struct path * pp, int path_state, struct udev_device *udev)
len = get_vpd_uid(pp);
origin = "sysfs";
}
- if (len <= 0)
- len = uid_fallback(pp, path_state, &origin, len);
+ if (len <= 0 && has_uid_fallback(pp)) {
+ int retrigger_tries;
+
+ conf = get_multipath_config();
+ retrigger_tries = conf->retrigger_tries;
+ put_multipath_config(conf);
+ if (pp->retriggers >= retrigger_tries)
+ len = uid_fallback(pp, path_state, &origin);
+ }
}
if ( len < 0 ) {
condlog(1, "%s: failed to get %s uid: %s",
--
2.17.2
--
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