freebsd-dev/sys/geom/geom_slice.c
Alexander Motin 3631c6382f Implement media change notification for DA and CD removable media devices.
It includes three parts:
 1) Modifications to CAM to detect media media changes and report them to
disk(9) layer. For modern SATA (and potentially UAS) devices it utilizes
Asynchronous Notification mechanism to receive events from hardware.
Active polling with TEST UNIT READY commands with 3 seconds period is used
for incapable hardware. After that both CD and DA drivers work the same way,
detecting two conditions: "NOT READY: Medium not present" after medium was
detected previously, and "UNIT ATTENTION: Not ready to ready change, medium
may have changed". First one reported to disk(9) as media removal, second
as media insert/change. To reliably receive second event new
AC_UNIT_ATTENTION async added to make UAs broadcasted to all periphs by
generic error handling code in cam_periph_error().
 2) Modifications to GEOM core to handle media remove and change events.
Media removal handled by spoiling all consumers attached to the provider.
Media change event also schedules provider retaste after spoiling to probe
new media. New flag G_CF_ORPHAN was added to consumers to reflect that
consumer is in process of destruction. It allows retaste to create new
geom instance of the same class, while previous one is still dying.
 3) Modifications to some GEOM classes: DEV -- to report media change
events to devd; VFS -- to handle spoiling same as orphan to prevent
accessing replaced media. PART class already handles spoiling alike to
orphan.

Reviewed by:	silence on geom@ and scsi@
Tested by:	avg
Sponsored by:	iXsystems, Inc. / PC-BSD
MFC after:	2 months
2012-07-29 11:51:48 +00:00

531 lines
14 KiB
C

/*-
* Copyright (c) 2002 Poul-Henning Kamp
* Copyright (c) 2002 Networks Associates Technology, Inc.
* All rights reserved.
*
* This software was developed for the FreeBSD Project by Poul-Henning Kamp
* and NAI Labs, the Security Research Division of Network Associates, Inc.
* under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
* DARPA CHATS research program.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The names of the authors may not be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/bio.h>
#include <sys/sysctl.h>
#include <sys/proc.h>
#include <sys/kthread.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/errno.h>
#include <sys/sbuf.h>
#include <geom/geom.h>
#include <geom/geom_slice.h>
#include <machine/stdarg.h>
static g_access_t g_slice_access;
static g_start_t g_slice_start;
static struct g_slicer *
g_slice_alloc(unsigned nslice, unsigned scsize)
{
struct g_slicer *gsp;
gsp = g_malloc(sizeof *gsp, M_WAITOK | M_ZERO);
if (scsize > 0)
gsp->softc = g_malloc(scsize, M_WAITOK | M_ZERO);
else
gsp->softc = NULL;
gsp->slices = g_malloc(nslice * sizeof(struct g_slice),
M_WAITOK | M_ZERO);
gsp->nslice = nslice;
return (gsp);
}
static void
g_slice_free(struct g_slicer *gsp)
{
if (gsp == NULL) /* XXX: phk thinks about this */
return;
g_free(gsp->slices);
if (gsp->hotspot != NULL)
g_free(gsp->hotspot);
if (gsp->softc != NULL)
g_free(gsp->softc);
g_free(gsp);
}
static int
g_slice_access(struct g_provider *pp, int dr, int dw, int de)
{
int error;
u_int u;
struct g_geom *gp;
struct g_consumer *cp;
struct g_provider *pp2;
struct g_slicer *gsp;
struct g_slice *gsl, *gsl2;
gp = pp->geom;
cp = LIST_FIRST(&gp->consumer);
KASSERT (cp != NULL, ("g_slice_access but no consumer"));
gsp = gp->softc;
if (dr > 0 || dw > 0 || de > 0) {
gsl = &gsp->slices[pp->index];
for (u = 0; u < gsp->nslice; u++) {
gsl2 = &gsp->slices[u];
if (gsl2->length == 0)
continue;
if (u == pp->index)
continue;
if (gsl->offset + gsl->length <= gsl2->offset)
continue;
if (gsl2->offset + gsl2->length <= gsl->offset)
continue;
/* overlap */
pp2 = gsl2->provider;
if ((pp->acw + dw) > 0 && pp2->ace > 0)
return (EPERM);
if ((pp->ace + de) > 0 && pp2->acw > 0)
return (EPERM);
}
}
/* On first open, grab an extra "exclusive" bit */
if (cp->acr == 0 && cp->acw == 0 && cp->ace == 0)
de++;
/* ... and let go of it on last close */
if ((cp->acr + dr) == 0 && (cp->acw + dw) == 0 && (cp->ace + de) == 1)
de--;
error = g_access(cp, dr, dw, de);
return (error);
}
/*
* XXX: It should be possible to specify here if we should finish all of the
* XXX: bio, or only the non-hot bits. This would get messy if there were
* XXX: two hot spots in the same bio, so for now we simply finish off the
* XXX: entire bio. Modifying hot data on the way to disk is frowned on
* XXX: so making that considerably harder is not a bad idea anyway.
*/
void
g_slice_finish_hot(struct bio *bp)
{
struct bio *bp2;
struct g_geom *gp;
struct g_consumer *cp;
struct g_slicer *gsp;
struct g_slice *gsl;
int idx;
KASSERT(bp->bio_to != NULL,
("NULL bio_to in g_slice_finish_hot(%p)", bp));
KASSERT(bp->bio_from != NULL,
("NULL bio_from in g_slice_finish_hot(%p)", bp));
gp = bp->bio_to->geom;
gsp = gp->softc;
cp = LIST_FIRST(&gp->consumer);
KASSERT(cp != NULL, ("NULL consumer in g_slice_finish_hot(%p)", bp));
idx = bp->bio_to->index;
gsl = &gsp->slices[idx];
bp2 = g_clone_bio(bp);
if (bp2 == NULL) {
g_io_deliver(bp, ENOMEM);
return;
}
if (bp2->bio_offset + bp2->bio_length > gsl->length)
bp2->bio_length = gsl->length - bp2->bio_offset;
bp2->bio_done = g_std_done;
bp2->bio_offset += gsl->offset;
g_io_request(bp2, cp);
return;
}
static void
g_slice_done(struct bio *bp)
{
KASSERT(bp->bio_cmd == BIO_GETATTR &&
strcmp(bp->bio_attribute, "GEOM::ident") == 0,
("bio_cmd=0x%x bio_attribute=%s", bp->bio_cmd, bp->bio_attribute));
if (bp->bio_error == 0 && bp->bio_data[0] != '\0') {
char idx[8];
/* Add index to the ident received. */
snprintf(idx, sizeof(idx), "s%d",
bp->bio_parent->bio_to->index);
if (strlcat(bp->bio_data, idx, bp->bio_length) >=
bp->bio_length) {
bp->bio_error = EFAULT;
}
}
g_std_done(bp);
}
static void
g_slice_start(struct bio *bp)
{
struct bio *bp2;
struct g_provider *pp;
struct g_geom *gp;
struct g_consumer *cp;
struct g_slicer *gsp;
struct g_slice *gsl;
struct g_slice_hot *ghp;
int idx, error;
u_int m_index;
off_t t;
pp = bp->bio_to;
gp = pp->geom;
gsp = gp->softc;
cp = LIST_FIRST(&gp->consumer);
idx = pp->index;
gsl = &gsp->slices[idx];
switch(bp->bio_cmd) {
case BIO_READ:
case BIO_WRITE:
case BIO_DELETE:
if (bp->bio_offset > gsl->length) {
g_io_deliver(bp, EINVAL); /* XXX: EWHAT ? */
return;
}
/*
* Check if we collide with any hot spaces, and call the
* method once if so.
*/
t = bp->bio_offset + gsl->offset;
for (m_index = 0; m_index < gsp->nhotspot; m_index++) {
ghp = &gsp->hotspot[m_index];
if (t >= ghp->offset + ghp->length)
continue;
if (t + bp->bio_length <= ghp->offset)
continue;
switch(bp->bio_cmd) {
case BIO_READ: idx = ghp->ract; break;
case BIO_WRITE: idx = ghp->wact; break;
case BIO_DELETE: idx = ghp->dact; break;
}
switch(idx) {
case G_SLICE_HOT_ALLOW:
/* Fall out and continue normal processing */
continue;
case G_SLICE_HOT_DENY:
g_io_deliver(bp, EROFS);
return;
case G_SLICE_HOT_START:
error = gsp->start(bp);
if (error && error != EJUSTRETURN)
g_io_deliver(bp, error);
return;
case G_SLICE_HOT_CALL:
error = g_post_event(gsp->hot, bp, M_NOWAIT,
gp, NULL);
if (error)
g_io_deliver(bp, error);
return;
}
break;
}
bp2 = g_clone_bio(bp);
if (bp2 == NULL) {
g_io_deliver(bp, ENOMEM);
return;
}
if (bp2->bio_offset + bp2->bio_length > gsl->length)
bp2->bio_length = gsl->length - bp2->bio_offset;
bp2->bio_done = g_std_done;
bp2->bio_offset += gsl->offset;
g_io_request(bp2, cp);
return;
case BIO_GETATTR:
/* Give the real method a chance to override */
if (gsp->start != NULL && gsp->start(bp))
return;
if (!strcmp("GEOM::ident", bp->bio_attribute)) {
bp2 = g_clone_bio(bp);
if (bp2 == NULL) {
g_io_deliver(bp, ENOMEM);
return;
}
bp2->bio_done = g_slice_done;
g_io_request(bp2, cp);
return;
}
if (!strcmp("GEOM::kerneldump", bp->bio_attribute)) {
struct g_kerneldump *gkd;
gkd = (struct g_kerneldump *)bp->bio_data;
gkd->offset += gsp->slices[idx].offset;
if (gkd->length > gsp->slices[idx].length)
gkd->length = gsp->slices[idx].length;
/* now, pass it on downwards... */
}
/* FALLTHROUGH */
case BIO_FLUSH:
bp2 = g_clone_bio(bp);
if (bp2 == NULL) {
g_io_deliver(bp, ENOMEM);
return;
}
bp2->bio_done = g_std_done;
g_io_request(bp2, cp);
break;
default:
g_io_deliver(bp, EOPNOTSUPP);
return;
}
}
void
g_slice_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp)
{
struct g_slicer *gsp;
gsp = gp->softc;
if (indent == NULL) {
sbuf_printf(sb, " i %u", pp->index);
sbuf_printf(sb, " o %ju",
(uintmax_t)gsp->slices[pp->index].offset);
return;
}
if (pp != NULL) {
sbuf_printf(sb, "%s<index>%u</index>\n", indent, pp->index);
sbuf_printf(sb, "%s<length>%ju</length>\n",
indent, (uintmax_t)gsp->slices[pp->index].length);
sbuf_printf(sb, "%s<seclength>%ju</seclength>\n", indent,
(uintmax_t)gsp->slices[pp->index].length / 512);
sbuf_printf(sb, "%s<offset>%ju</offset>\n", indent,
(uintmax_t)gsp->slices[pp->index].offset);
sbuf_printf(sb, "%s<secoffset>%ju</secoffset>\n", indent,
(uintmax_t)gsp->slices[pp->index].offset / 512);
}
}
int
g_slice_config(struct g_geom *gp, u_int idx, int how, off_t offset, off_t length, u_int sectorsize, const char *fmt, ...)
{
struct g_provider *pp, *pp2;
struct g_slicer *gsp;
struct g_slice *gsl;
va_list ap;
struct sbuf *sb;
int acc;
g_trace(G_T_TOPOLOGY, "g_slice_config(%s, %d, %d)",
gp->name, idx, how);
g_topology_assert();
gsp = gp->softc;
if (idx >= gsp->nslice)
return(EINVAL);
gsl = &gsp->slices[idx];
pp = gsl->provider;
if (pp != NULL)
acc = pp->acr + pp->acw + pp->ace;
else
acc = 0;
if (acc != 0 && how != G_SLICE_CONFIG_FORCE) {
if (length < gsl->length)
return(EBUSY);
if (offset != gsl->offset)
return(EBUSY);
}
/* XXX: check offset + length <= MEDIASIZE */
if (how == G_SLICE_CONFIG_CHECK)
return (0);
gsl->length = length;
gsl->offset = offset;
gsl->sectorsize = sectorsize;
if (length == 0) {
if (pp == NULL)
return (0);
if (bootverbose)
printf("GEOM: Deconfigure %s\n", pp->name);
g_wither_provider(pp, ENXIO);
gsl->provider = NULL;
gsp->nprovider--;
return (0);
}
if (pp != NULL) {
if (bootverbose)
printf("GEOM: Reconfigure %s, start %jd length %jd end %jd\n",
pp->name, (intmax_t)offset, (intmax_t)length,
(intmax_t)(offset + length - 1));
pp->mediasize = gsl->length;
return (0);
}
sb = sbuf_new_auto();
va_start(ap, fmt);
sbuf_vprintf(sb, fmt, ap);
va_end(ap);
sbuf_finish(sb);
pp = g_new_providerf(gp, sbuf_data(sb));
pp2 = LIST_FIRST(&gp->consumer)->provider;
pp->flags = pp2->flags & G_PF_CANDELETE;
pp->stripesize = pp2->stripesize;
pp->stripeoffset = pp2->stripeoffset + offset;
if (pp->stripesize > 0)
pp->stripeoffset %= pp->stripesize;
if (0 && bootverbose)
printf("GEOM: Configure %s, start %jd length %jd end %jd\n",
pp->name, (intmax_t)offset, (intmax_t)length,
(intmax_t)(offset + length - 1));
pp->index = idx;
pp->mediasize = gsl->length;
pp->sectorsize = gsl->sectorsize;
gsl->provider = pp;
gsp->nprovider++;
g_error_provider(pp, 0);
sbuf_delete(sb);
return(0);
}
/*
* Configure "hotspots". A hotspot is a piece of the parent device which
* this particular slicer cares about for some reason. Typically because
* it contains meta-data used to configure the slicer.
* A hotspot is identified by its index number. The offset and length are
* relative to the parent device, and the three "?act" fields specify
* what action to take on BIO_READ, BIO_DELETE and BIO_WRITE.
*
* XXX: There may be a race relative to g_slice_start() here, if an existing
* XXX: hotspot is changed wile I/O is happening. Should this become a problem
* XXX: we can protect the hotspot stuff with a mutex.
*/
int
g_slice_conf_hot(struct g_geom *gp, u_int idx, off_t offset, off_t length, int ract, int dact, int wact)
{
struct g_slicer *gsp;
struct g_slice_hot *gsl, *gsl2;
g_trace(G_T_TOPOLOGY, "g_slice_conf_hot(%s, idx: %d, off: %jd, len: %jd)",
gp->name, idx, (intmax_t)offset, (intmax_t)length);
g_topology_assert();
gsp = gp->softc;
gsl = gsp->hotspot;
if(idx >= gsp->nhotspot) {
gsl2 = g_malloc((idx + 1) * sizeof *gsl2, M_WAITOK | M_ZERO);
if (gsp->hotspot != NULL)
bcopy(gsp->hotspot, gsl2, gsp->nhotspot * sizeof *gsl2);
gsp->hotspot = gsl2;
if (gsp->hotspot != NULL)
g_free(gsl);
gsl = gsl2;
gsp->nhotspot = idx + 1;
}
gsl[idx].offset = offset;
gsl[idx].length = length;
KASSERT(!((ract | dact | wact) & G_SLICE_HOT_START)
|| gsp->start != NULL, ("G_SLICE_HOT_START but no slice->start"));
/* XXX: check that we _have_ a start function if HOT_START specified */
gsl[idx].ract = ract;
gsl[idx].dact = dact;
gsl[idx].wact = wact;
return (0);
}
void
g_slice_spoiled(struct g_consumer *cp)
{
struct g_geom *gp;
struct g_slicer *gsp;
g_topology_assert();
gp = cp->geom;
g_trace(G_T_TOPOLOGY, "g_slice_spoiled(%p/%s)", cp, gp->name);
cp->flags |= G_CF_ORPHAN;
gsp = gp->softc;
gp->softc = NULL;
g_slice_free(gsp);
g_wither_geom(gp, ENXIO);
}
int
g_slice_destroy_geom(struct gctl_req *req, struct g_class *mp, struct g_geom *gp)
{
g_slice_spoiled(LIST_FIRST(&gp->consumer));
return (0);
}
struct g_geom *
g_slice_new(struct g_class *mp, u_int slices, struct g_provider *pp, struct g_consumer **cpp, void *extrap, int extra, g_slice_start_t *start)
{
struct g_geom *gp;
struct g_slicer *gsp;
struct g_consumer *cp;
void **vp;
int error;
g_topology_assert();
vp = (void **)extrap;
gp = g_new_geomf(mp, "%s", pp->name);
gsp = g_slice_alloc(slices, extra);
gsp->start = start;
gp->access = g_slice_access;
gp->orphan = g_slice_orphan;
gp->softc = gsp;
gp->start = g_slice_start;
gp->spoiled = g_slice_spoiled;
if (gp->dumpconf == NULL)
gp->dumpconf = g_slice_dumpconf;
if (gp->class->destroy_geom == NULL)
gp->class->destroy_geom = g_slice_destroy_geom;
cp = g_new_consumer(gp);
error = g_attach(cp, pp);
if (error == 0)
error = g_access(cp, 1, 0, 0);
if (error) {
g_wither_geom(gp, ENXIO);
return (NULL);
}
if (extrap != NULL)
*vp = gsp->softc;
*cpp = cp;
return (gp);
}
void
g_slice_orphan(struct g_consumer *cp)
{
g_trace(G_T_TOPOLOGY, "g_slice_orphan(%p/%s)", cp, cp->provider->name);
g_topology_assert();
/* XXX: Not good enough we leak the softc and its suballocations */
g_slice_free(cp->geom->softc);
g_wither_geom(cp->geom, ENXIO);
}