Author: sbruno
Date: Fri Mar 8 20:07:32 2013
New Revision: 248068
URL: http://svnweb.freebsd.org/changeset/base/248068
Log:
Add legacy support to geom raid to create a /dev/arX device for support
of upgrading older machines using ataraid(4) to newer releases.
This optional parameter is controlled via kern.geom.raid.legacy_aliases
and will create a /dev/ar0 device that will point at /dev/raid/r0 for
example.
Tested on Dell SC 1425 DDF-1 format software raid controllers installing from
stable/7 and upgrading to stable/9 without having to adjust /etc/fstab
Reviewed by: mav
Obtained from: Yahoo!
MFC after: 2 Weeks
Modified:
head/sbin/geom/class/raid/graid.8
head/sys/geom/raid/g_raid.c
Modified: head/sbin/geom/class/raid/graid.8
==============================================================================
--- head/sbin/geom/class/raid/graid.8 Fri Mar 8 19:36:44 2013
(r248067)
+++ head/sbin/geom/class/raid/graid.8 Fri Mar 8 20:07:32 2013
(r248068)
@@ -305,6 +305,9 @@ Write errors are always considered as di
Time to wait for missing array components on startup.
.It Va kern.geom.raid. Ns Ar X Ns Va .enable : No 1
Enable taste for specific metadata or transformation module.
+.It Va kern.geom.raid.legacy_aliases : No 0
+Enable geom raid emulation of /dev/ar%d devices from ataraid(4)
+This should aid the upgrade of systems from legacy to modern releases.
.El
.Sh EXIT STATUS
Exit status is 0 on success, and non-zero if the command fails.
Modified: head/sys/geom/raid/g_raid.c
==============================================================================
--- head/sys/geom/raid/g_raid.c Fri Mar 8 19:36:44 2013 (r248067)
+++ head/sys/geom/raid/g_raid.c Fri Mar 8 20:07:32 2013 (r248068)
@@ -92,6 +92,11 @@ TUNABLE_INT("kern.geom.raid.idle_thresho
SYSCTL_UINT(_kern_geom_raid, OID_AUTO, idle_threshold, CTLFLAG_RW,
&g_raid_idle_threshold, 1000000,
"Time in microseconds to consider a volume idle.");
+static u_int ar_legacy_aliases = 1;
+SYSCTL_INT(_kern_geom_raid, OID_AUTO, legacy_aliases, CTLFLAG_RW,
+ &ar_legacy_aliases, 0, "Create aliases named as the legacy ataraid
style.");
+TUNABLE_INT("kern.geom_raid.legacy_aliases", &ar_legacy_aliases);
+
#define MSLEEP(rv, ident, mtx, priority, wmesg, timeout) do {
\
G_RAID_DEBUG(4, "%s: Sleeping %p.", __func__, (ident)); \
@@ -1637,6 +1642,7 @@ g_raid_launch_provider(struct g_raid_vol
struct g_raid_softc *sc;
struct g_provider *pp;
char name[G_RAID_MAX_VOLUMENAME];
+ char announce_buf[80], buf1[32];
off_t off;
sc = vol->v_softc;
@@ -1650,6 +1656,22 @@ g_raid_launch_provider(struct g_raid_vol
/* Otherwise use sequential volume number. */
snprintf(name, sizeof(name), "raid/r%d", vol->v_global_id);
}
+
+ /*
+ * Create a /dev/ar%d that the old ataraid(4) stack once
+ * created as an alias for /dev/raid/r%d if requested.
+ * This helps going from stable/7 ataraid devices to newer
+ * FreeBSD releases. sbruno 07 MAY 2013
+ */
+
+ if (ar_legacy_aliases) {
+ snprintf(announce_buf, sizeof(announce_buf),
+ "kern.devalias.%s", name);
+ snprintf(buf1, sizeof(buf1),
+ "ar%d", vol->v_global_id);
+ setenv(announce_buf, buf1);
+ }
+
pp = g_new_providerf(sc->sc_geom, "%s", name);
pp->private = vol;
pp->mediasize = vol->v_mediasize;
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