[dm-devel] [PATCH 04/13] libmultipath: return error numbers from sysfs_get_XXX
Hannes Reinecke
hare at suse.de
Fri Nov 15 10:29:35 UTC 2013
Instead of returning hand-crafted error values from sysfs_get_XXX
functions we should be using the standard error numbers.
Signed-off-by: Hannes Reinecke <hare at suse.de>
---
libmultipath/discovery.c | 40 +++++++++++++++++++++-------------------
libmultipath/discovery.h | 2 +-
libmultipath/propsel.c | 2 +-
libmultipath/structs_vec.c | 3 +--
4 files changed, 24 insertions(+), 23 deletions(-)
diff --git a/libmultipath/discovery.c b/libmultipath/discovery.c
index 3292358..d5557d9 100644
--- a/libmultipath/discovery.c
+++ b/libmultipath/discovery.c
@@ -140,31 +140,34 @@ path_discovery (vector pathvec, struct config * conf, int flag)
}
#define declare_sysfs_get_str(fname) \
-extern int \
+extern ssize_t \
sysfs_get_##fname (struct udev_device * udev, char * buff, size_t len) \
{ \
+ ssize_t ret; \
const char * attr; \
const char * devname; \
\
+ if (!udev) \
+ return -ENOSYS; \
+ \
devname = udev_device_get_sysname(udev); \
\
attr = udev_device_get_sysattr_value(udev, #fname); \
if (!attr) { \
condlog(3, "%s: attribute %s not found in sysfs", \
devname, #fname); \
- return 1; \
+ return -ENXIO; \
} \
if (strlen(attr) > len) { \
condlog(3, "%s: overflow in attribute %s", \
devname, #fname); \
- return 2; \
+ return -EINVAL; \
} \
- strlcpy(buff, attr, len); \
- return 0; \
+ ret = strlcpy(buff, attr, len); \
+ return ret; \
}
declare_sysfs_get_str(devtype);
-declare_sysfs_get_str(cutype);
declare_sysfs_get_str(vendor);
declare_sysfs_get_str(model);
declare_sysfs_get_str(rev);
@@ -180,7 +183,7 @@ sysfs_get_timeout(struct path *pp, unsigned int *timeout)
unsigned int t;
if (!pp->udev || pp->bus != SYSFS_BUS_SCSI)
- return 1;
+ return -ENOSYS;
parent = pp->udev;
while (parent) {
@@ -192,7 +195,7 @@ sysfs_get_timeout(struct path *pp, unsigned int *timeout)
}
if (!attr) {
condlog(3, "%s: No timeout value in sysfs", pp->dev);
- return 1;
+ return -ENXIO;
}
r = sscanf(attr, "%u\n", &t);
@@ -200,7 +203,7 @@ sysfs_get_timeout(struct path *pp, unsigned int *timeout)
if (r != 1) {
condlog(3, "%s: Cannot parse timeout attribute '%s'",
pp->dev, attr);
- return 1;
+ return -EINVAL;
}
*timeout = t;
@@ -650,17 +653,17 @@ scsi_sysfs_pathinfo (struct path * pp)
if (!attr_path || pp->sg_id.host_no == -1)
return 1;
- if (sysfs_get_vendor(parent, pp->vendor_id, SCSI_VENDOR_SIZE))
+ if (sysfs_get_vendor(parent, pp->vendor_id, SCSI_VENDOR_SIZE) <= 0)
return 1;
condlog(3, "%s: vendor = %s", pp->dev, pp->vendor_id);
- if (sysfs_get_model(parent, pp->product_id, SCSI_PRODUCT_SIZE))
+ if (sysfs_get_model(parent, pp->product_id, SCSI_PRODUCT_SIZE) <= 0)
return 1;
condlog(3, "%s: product = %s", pp->dev, pp->product_id);
- if (sysfs_get_rev(parent, pp->rev, SCSI_REV_SIZE))
+ if (sysfs_get_rev(parent, pp->rev, SCSI_REV_SIZE) <= 0)
return 1;
condlog(3, "%s: rev = %s", pp->dev, pp->rev);
@@ -712,7 +715,7 @@ ccw_sysfs_pathinfo (struct path * pp)
condlog(3, "%s: vendor = %s", pp->dev, pp->vendor_id);
- if (sysfs_get_devtype(parent, attr_buff, FILE_NAME_SIZE))
+ if (sysfs_get_devtype(parent, attr_buff, FILE_NAME_SIZE) <= 0)
return 1;
if (!strncmp(attr_buff, "3370", 4)) {
@@ -772,17 +775,17 @@ cciss_sysfs_pathinfo (struct path * pp)
if (!attr_path || pp->sg_id.host_no == -1)
return 1;
- if (sysfs_get_vendor(parent, pp->vendor_id, SCSI_VENDOR_SIZE))
+ if (sysfs_get_vendor(parent, pp->vendor_id, SCSI_VENDOR_SIZE) <= 0)
return 1;
condlog(3, "%s: vendor = %s", pp->dev, pp->vendor_id);
- if (sysfs_get_model(parent, pp->product_id, SCSI_PRODUCT_SIZE))
+ if (sysfs_get_model(parent, pp->product_id, SCSI_PRODUCT_SIZE) <= 0)
return 1;
condlog(3, "%s: product = %s", pp->dev, pp->product_id);
- if (sysfs_get_rev(parent, pp->rev, SCSI_REV_SIZE))
+ if (sysfs_get_rev(parent, pp->rev, SCSI_REV_SIZE) <= 0)
return 1;
condlog(3, "%s: rev = %s", pp->dev, pp->rev);
@@ -816,7 +819,7 @@ common_sysfs_pathinfo (struct path * pp)
condlog(4, "%s: udev not initialised", pp->dev);
return 1;
}
- if (sysfs_get_dev(pp->udev, pp->dev_t, BLK_DEV_SIZE)) {
+ if (sysfs_get_dev(pp->udev, pp->dev_t, BLK_DEV_SIZE) <= 0) {
condlog(3, "%s: no 'dev' attribute in sysfs", pp->dev);
return 1;
}
@@ -956,8 +959,7 @@ get_state (struct path * pp, int daemon)
if (daemon)
checker_set_async(c);
if (!conf->checker_timeout &&
- (pp->bus != SYSFS_BUS_SCSI ||
- sysfs_get_timeout(pp, &(c->timeout))))
+ sysfs_get_timeout(pp, &(c->timeout)) <= 0)
c->timeout = DEF_TIMEOUT;
state = checker_check(c);
condlog(3, "%s: state = %s", pp->dev, checker_state_name(state));
diff --git a/libmultipath/discovery.h b/libmultipath/discovery.h
index d049ead..3d2d0ce 100644
--- a/libmultipath/discovery.h
+++ b/libmultipath/discovery.h
@@ -26,7 +26,7 @@
struct config;
-int sysfs_get_dev (struct udev_device *udev, char * buff, size_t len);
+ssize_t sysfs_get_dev (struct udev_device *udev, char * buff, size_t len);
int path_discovery (vector pathvec, struct config * conf, int flag);
int do_tur (char *);
diff --git a/libmultipath/propsel.c b/libmultipath/propsel.c
index e47d0ca..f092227 100644
--- a/libmultipath/propsel.c
+++ b/libmultipath/propsel.c
@@ -351,7 +351,7 @@ out:
condlog(3, "%s: checker timeout = %u s (config file default)",
pp->dev, c->timeout);
}
- else if (pp->udev && sysfs_get_timeout(pp, &c->timeout) == 0)
+ else if (sysfs_get_timeout(pp, &c->timeout) > 0)
condlog(3, "%s: checker timeout = %u ms (sysfs setting)",
pp->dev, c->timeout);
else {
diff --git a/libmultipath/structs_vec.c b/libmultipath/structs_vec.c
index 14ea1c7..abb2c56 100644
--- a/libmultipath/structs_vec.c
+++ b/libmultipath/structs_vec.c
@@ -451,8 +451,7 @@ verify_paths(struct multipath * mpp, struct vectors * vecs, vector rpvec)
/*
* see if path is in sysfs
*/
- if (!pp->udev || sysfs_get_dev(pp->udev, pp->dev_t,
- BLK_DEV_SIZE)) {
+ if (sysfs_get_dev(pp->udev, pp->dev_t, BLK_DEV_SIZE) <= 0) {
if (pp->state != PATH_DOWN) {
condlog(1, "%s: removing valid path %s in state %d",
mpp->alias, pp->dev, pp->state);
--
1.8.1.4
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