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Add legacy support to geom raid to create a /dev/arX device for support

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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
This commit is contained in:
Sean Bruno 2013-03-08 20:07:32 +00:00
parent b3469f58a7
commit bd9fba0cfe
2 changed files with 25 additions and 0 deletions
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3
sbin/geom/class/raid/graid.8
View File

@ -305,6 +305,9 @@ Write errors are always considered as disk failures.
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.

22
sys/geom/raid/g_raid.c
View File

@ -92,6 +92,11 @@ TUNABLE_INT("kern.geom.raid.idle_threshold", &g_raid_idle_threshold);
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_volume *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_volume *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;