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/*
* This file and its contents are supplied under the terms of the
* Common Development and Distribution License ("CDDL"), version 1.0.
* You may only use this file in accordance with the terms of version
* 1.0 of the CDDL.
*
* A full copy of the text of the CDDL should have accompanied this
* source. A copy of the CDDL is also available via the Internet at
* http://www.illumos.org/license/CDDL.
*/
/*
* Copyright 2016 Joyent, Inc.
*/
/*
* Overlay device FMA operations.
*
* For more information, see the big theory statement in
* uts/common/io/overlay/overlay.c
*/
#include <sys/ddifm.h>
#include <sys/overlay_impl.h>
kmutex_t overlay_fm_lock;
uint_t overlay_fm_count;
void
overlay_fm_init(void)
{
overlay_fm_count = 0;
mutex_init(&overlay_fm_lock, NULL, MUTEX_DRIVER, NULL);
}
void
overlay_fm_fini(void)
{
VERIFY(overlay_fm_count == 0);
mutex_destroy(&overlay_fm_lock);
}
void
overlay_fm_degrade(overlay_dev_t *odd, const char *msg)
{
mutex_enter(&overlay_fm_lock);
mutex_enter(&odd->odd_lock);
if (msg != NULL)
(void) strlcpy(odd->odd_fmamsg, msg, OVERLAY_STATUS_BUFLEN);
if (odd->odd_flags & OVERLAY_F_DEGRADED)
goto out;
odd->odd_flags |= OVERLAY_F_DEGRADED;
overlay_fm_count++;
if (overlay_fm_count == 1) {
ddi_fm_service_impact(overlay_dip, DDI_SERVICE_DEGRADED);
}
out:
mutex_exit(&odd->odd_lock);
mutex_exit(&overlay_fm_lock);
}
void
overlay_fm_restore(overlay_dev_t *odd)
{
mutex_enter(&overlay_fm_lock);
mutex_enter(&odd->odd_lock);
if (!(odd->odd_flags & OVERLAY_F_DEGRADED))
goto out;
odd->odd_fmamsg[0] = '\0';
odd->odd_flags &= ~OVERLAY_F_DEGRADED;
overlay_fm_count--;
if (overlay_fm_count == 0) {
ddi_fm_service_impact(overlay_dip, DDI_SERVICE_RESTORED);
}
out:
mutex_exit(&odd->odd_lock);
mutex_exit(&overlay_fm_lock);
}
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