diff options
Diffstat (limited to 'sys/kern/kern_conf.c')
-rw-r--r-- | sys/kern/kern_conf.c | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/sys/kern/kern_conf.c b/sys/kern/kern_conf.c index 59b876c..a4d90c7 100644 --- a/sys/kern/kern_conf.c +++ b/sys/kern/kern_conf.c @@ -963,6 +963,68 @@ make_dev_alias_p(int flags, struct cdev **cdev, struct cdev *pdev, return (res); } +int +make_dev_physpath_alias(int flags, struct cdev **cdev, struct cdev *pdev, + struct cdev *old_alias, const char *physpath) +{ + char *devfspath; + int physpath_len; + int max_parentpath_len; + int parentpath_len; + int devfspathbuf_len; + int mflags; + int ret; + + *cdev = NULL; + devfspath = NULL; + physpath_len = strlen(physpath); + ret = EINVAL; + if (physpath_len == 0) + goto out; + + if (strncmp("id1,", physpath, 4) == 0) { + physpath += 4; + physpath_len -= 4; + if (physpath_len == 0) + goto out; + } + + max_parentpath_len = SPECNAMELEN - physpath_len - /*/*/1; + parentpath_len = strlen(pdev->si_name); + if (max_parentpath_len < parentpath_len) { + printf("make_dev_physpath_alias: WARNING - Unable to alias %s " + "to %s/%s - path too long\n", + pdev->si_name, physpath, pdev->si_name); + ret = ENAMETOOLONG; + goto out; + } + + mflags = (flags & MAKEDEV_NOWAIT) ? M_NOWAIT : M_WAITOK; + devfspathbuf_len = physpath_len + /*/*/1 + parentpath_len + /*NUL*/1; + devfspath = malloc(devfspathbuf_len, M_DEVBUF, mflags); + if (devfspath == NULL) { + ret = ENOMEM; + goto out; + } + + sprintf(devfspath, "%s/%s", physpath, pdev->si_name); + if (old_alias != NULL + && strcmp(old_alias->si_name, devfspath) == 0) { + /* Retain the existing alias. */ + *cdev = old_alias; + old_alias = NULL; + ret = 0; + } else { + ret = make_dev_alias_p(flags, cdev, pdev, devfspath); + } +out: + if (old_alias != NULL) + destroy_dev(old_alias); + if (devfspath != NULL) + free(devfspath, M_DEVBUF); + return (ret); +} + static void destroy_devl(struct cdev *dev) { |