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author | gibbs <gibbs@FreeBSD.org> | 2011-06-14 16:29:43 +0000 |
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committer | gibbs <gibbs@FreeBSD.org> | 2011-06-14 16:29:43 +0000 |
commit | 9d45c190c83f9be0326790e82d82a5eb1ce395c7 (patch) | |
tree | b5837253e7d00c27355ed10d509f55e980e44161 /sys/kern/kern_conf.c | |
parent | 896ba7687e4e78368fc05e758515c9804ebca9f0 (diff) | |
download | FreeBSD-src-9d45c190c83f9be0326790e82d82a5eb1ce395c7.zip FreeBSD-src-9d45c190c83f9be0326790e82d82a5eb1ce395c7.tar.gz |
sys/sys/conf.h:
sys/kern/kern_conf.c:
Add make_dev_physpath_alias(). This interface takes
the parent cdev of the alias, an old alias cdev (if any)
to replace with the newly created alias, and the physical
path string. The alias is visiable as a symlink to the
parent, with the same name as the parent, rooted at
physpath in devfs.
Note: make_dev_physpath_alias() has hard coded knowledge of the
Solaris style prefix convention for physical path data,
"id1,". In the future, I expect the convention to change
to allow "physical path quality" to be reported in the
prefix. For example, a physical path based on NewBus
topology would be of "lower quality" than a physical path
reported by a device enclosure.
Sponsored by: Spectra Logic Corporation
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) { |