path_id: rename scsi sub-fuctions

[elogind.git] / extras / path_id / path_id.c

diff --git a/extras/path_id/path_id.c b/extras/path_id/path_id.c
index b0a0bfd885e0101f95ee91cef2de8cb94697b9ab..08b7e150c9dacfd37ad17111a7ec7b0e58c90dd2 100644 (file)
--- a/extras/path_id/path_id.c
+++ b/extras/path_id/path_id.c
@@ -89,52 +89,7 @@ static struct udev_device *skip_subsystem(struct udev_device *dev, const char *s
        return dev;
 }
 
-/* find smallest number of instances of <syspath>/<name><number> */
-static int base_number(const char *syspath, const char *name)
-{
-       char *base;
-       char *pos;
-       DIR *dir;
-       struct dirent *dent;
-       size_t len;
-       int number = -1;
-
-       base = strdup(syspath);
-       if (base == NULL)
-               goto out;
-
-       pos = strrchr(base, '/');
-       if (pos == NULL)
-               goto out;
-       pos[0] = '\0';
-
-       len = strlen(name);
-       dir = opendir(base);
-       if (dir == NULL)
-               goto out;
-       for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
-               char *rest;
-               int i;
-
-               if (dent->d_name[0] == '.')
-                       continue;
-               if (dent->d_type != DT_DIR && dent->d_type != DT_LNK)
-                       continue;
-               if (strncmp(dent->d_name, name, len) != 0)
-                       continue;
-               i = strtoul(&dent->d_name[len], &rest, 10);
-               if (rest[0] != '\0')
-                       continue;
-               if (number == -1 || i < number)
-                       number = i;
-       }
-       closedir(dir);
-out:
-       free(base);
-       return number;
-}
-
-static struct udev_device *handle_fc(struct udev_device *parent, char **path)
+static struct udev_device *handle_scsi_fibre_channel(struct udev_device *parent, char **path)
 {
        struct udev *udev  = udev_device_get_udev(parent);
        struct udev_device *targetdev;
@@ -162,12 +117,12 @@ out:
        return parent;
 }
 
-static struct udev_device *handle_sas(struct udev_device *parent, char **path)
+static struct udev_device *handle_scsi_sas(struct udev_device *parent, char **path)
 {
        return NULL;
 }
 
-static struct udev_device *handle_iscsi(struct udev_device *parent, char **path)
+static struct udev_device *handle_scsi_iscsi(struct udev_device *parent, char **path)
 {
        struct udev *udev  = udev_device_get_udev(parent);
        struct udev_device *transportdev;
@@ -178,7 +133,7 @@ static struct udev_device *handle_iscsi(struct udev_device *parent, char **path)
        const char *addr;
        const char *port;
 
-       /* find iscsi session */        
+       /* find iscsi session */
        transportdev = parent;
        while (1) {
                transportdev = udev_device_get_parent(transportdev);
@@ -224,32 +179,71 @@ out:
        return parent;
 }
 
-static struct udev_device *handle_scsi(struct udev_device *parent, char **path)
+static struct udev_device *handle_scsi_default(struct udev_device *parent, char **path)
 {
        struct udev_device *hostdev;
        int host, bus, target, lun;
        const char *name;
-       int base;
+       char *base;
+       char *pos;
+       DIR *dir;
+       struct dirent *dent;
+       int basenum;
 
        hostdev = udev_device_get_parent_with_subsystem_devtype(parent, "scsi", "scsi_host");
        if (hostdev == NULL)
-               return parent;
+               return NULL;
 
        name = udev_device_get_sysname(parent);
        if (sscanf(name, "%d:%d:%d:%d", &host, &bus, &target, &lun) != 4)
-               return parent;
+               return NULL;
 
        /* rebase host offset to get the local relative number */
-       base = base_number(udev_device_get_syspath(hostdev), "host");
-       if (base < 0)
-               return parent;
-       host -= base;
+       basenum = -1;
+       base = strdup(udev_device_get_syspath(hostdev));
+       if (base == NULL)
+               return NULL;
+       pos = strrchr(base, '/');
+       if (pos == NULL) {
+               parent = NULL;
+               goto out;
+       }
+       pos[0] = '\0';
+       dir = opendir(base);
+       if (dir == NULL) {
+               parent = NULL;
+               goto out;
+       }
+       for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
+               char *rest;
+               int i;
+
+               if (dent->d_name[0] == '.')
+                       continue;
+               if (dent->d_type != DT_DIR && dent->d_type != DT_LNK)
+                       continue;
+               if (strncmp(dent->d_name, "host", 4) != 0)
+                       continue;
+               i = strtoul(&dent->d_name[4], &rest, 10);
+               if (rest[0] != '\0')
+                       continue;
+               if (basenum == -1 || i < basenum)
+                       basenum = i;
+       }
+       closedir(dir);
+       if (basenum == -1) {
+               parent = NULL;
+               goto out;
+       }
+       host -= basenum;
 
        path_prepend(path, "scsi-%u:%u:%u:%u", host, bus, target, lun);
+out:
+       free(base);
        return hostdev;
 }
 
-static struct udev_device *handle_scsi_lun(struct udev_device *parent, char **path)
+static struct udev_device *handle_scsi(struct udev_device *parent, char **path)
 {
        const char *devtype;
        const char *name;
@@ -267,29 +261,25 @@ static struct udev_device *handle_scsi_lun(struct udev_device *parent, char **pa
                goto out;
        }
 
-       /* broken scsi transport devices would need a subsystem */
+       /* lousy scsi sysfs does not have a "subsystem" for the transport */
        name = udev_device_get_syspath(parent);
 
-       /* fibre channel */
        if (strstr(name, "/rport-") != NULL) {
-               parent = handle_fc(parent, path);
+               parent = handle_scsi_fibre_channel(parent, path);
                goto out;
        }
 
-       /* sas */
        if (strstr(name, "/end_device-") != NULL) {
-               parent = handle_sas(parent, path);
+               parent = handle_scsi_sas(parent, path);
                goto out;
        }
 
-       /* iSCSI */
        if (strstr(name, "/session") != NULL) {
-               parent = handle_iscsi(parent, path);
+               parent = handle_scsi_iscsi(parent, path);
                goto out;
        }
 
-       /* default */
-       parent = handle_scsi(parent, path);
+       parent = handle_scsi_default(parent, path);
 out:
        return parent;
 }
@@ -439,7 +429,7 @@ int main(int argc, char **argv)
                } else if (strcmp(subsys, "scsi_tape") == 0) {
                        handle_scsi_tape(parent, &path_suffix);
                } else if (strcmp(subsys, "scsi") == 0) {
-                       parent = handle_scsi_lun(parent, &path);
+                       parent = handle_scsi(parent, &path);
                } else if (strcmp(subsys, "cciss") == 0) {
                        handle_cciss(parent, &path);
                } else if (strcmp(subsys, "usb") == 0) {