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86b3c6f5bc
freebsd-nq/sys/geom/vinum/geom_vinum_drive.c
Ulf Lilleengen 86b3c6f5bc - Import macros used in gmirror for printing gvinum debug messages and making 
the output more standardized.
- Add a sysctl to set the verbosity of the debug messages.
- While there, fixup typos and wording in the messages.
2008-10-26 17:20:37 +00:00

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/*-
* Copyright (c) 2004, 2005 Lukas Ertl
* All rights reserved.
*
* 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.
*
* 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/bio.h>
#include <sys/errno.h>
#include <sys/endian.h>
#include <sys/conf.h>
#include <sys/kernel.h>
#include <sys/kthread.h>
#include <sys/libkern.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/mutex.h>
#include <sys/sbuf.h>
#include <sys/systm.h>
#include <sys/time.h>
#include <sys/vimage.h>
#include <geom/geom.h>
#include <geom/vinum/geom_vinum_var.h>
#include <geom/vinum/geom_vinum.h>
#include <geom/vinum/geom_vinum_share.h>
#define GV_LEGACY_I386 0
#define GV_LEGACY_AMD64 1
#define GV_LEGACY_SPARC64 2
#define GV_LEGACY_POWERPC 3
static void gv_drive_dead(void *, int);
static void gv_drive_worker(void *);
static int gv_legacy_header_type(uint8_t *, int);
/*
* Here are the "offset (size)" for the various struct gv_hdr fields,
* for the legacy i386 (or 32-bit powerpc), legacy amd64 (or sparc64), and
* current (cpu & endian agnostic) versions of the on-disk format of the vinum
* header structure:
*
* i386 amd64 current field
* -------- -------- -------- -----
* 0 ( 8) 0 ( 8) 0 ( 8) magic
* 8 ( 4) 8 ( 8) 8 ( 8) config_length
* 12 (32) 16 (32) 16 (32) label.sysname
* 44 (32) 48 (32) 48 (32) label.name
* 76 ( 4) 80 ( 8) 80 ( 8) label.date_of_birth.tv_sec
* 80 ( 4) 88 ( 8) 88 ( 8) label.date_of_birth.tv_usec
* 84 ( 4) 96 ( 8) 96 ( 8) label.last_update.tv_sec
* 88 ( 4) 104 ( 8) 104 ( 8) label.last_update.tv_usec
* 92 ( 8) 112 ( 8) 112 ( 8) label.drive_size
* ======== ======== ========
* 100 120 120 total size
*
* NOTE: i386 and amd64 formats are stored as little-endian; the current
* format uses big-endian (network order).
*/
/* Checks for legacy format depending on platform. */
static int
gv_legacy_header_type(uint8_t *hdr, int bigendian)
{
uint32_t *i32;
int arch_32, arch_64, i;
/* Set arch according to endianess. */
if (bigendian) {
arch_32 = GV_LEGACY_POWERPC;
arch_64 = GV_LEGACY_SPARC64;
} else {
arch_32 = GV_LEGACY_I386;
arch_64 = GV_LEGACY_AMD64;
}
/* if non-empty hostname overlaps 64-bit config_length */
i32 = (uint32_t *)(hdr + 12);
if (*i32 != 0)
return (arch_32);
/* check for non-empty hostname */
if (hdr[16] != 0)
return (arch_64);
/* check bytes past 32-bit structure */
for (i = 100; i < 120; i++)
if (hdr[i] != 0)
return (arch_32);
/* check for overlapping timestamp */
i32 = (uint32_t *)(hdr + 84);
if (*i32 == 0)
return (arch_64);
return (arch_32);
}
/*
* Read the header while taking magic number into account, and write it to
* destination pointer.
*/
int
gv_read_header(struct g_consumer *cp, struct gv_hdr *m_hdr)
{
struct g_provider *pp;
uint64_t magic_machdep;
uint8_t *d_hdr;
int be, off;
#define GV_GET32(endian) \
endian##32toh(*((uint32_t *)&d_hdr[off])); \
off += 4
#define GV_GET64(endian) \
endian##64toh(*((uint64_t *)&d_hdr[off])); \
off += 8
KASSERT(m_hdr != NULL, ("gv_read_header: null m_hdr"));
KASSERT(cp != NULL, ("gv_read_header: null cp"));
pp = cp->provider;
KASSERT(pp != NULL, ("gv_read_header: null pp"));
d_hdr = g_read_data(cp, GV_HDR_OFFSET, pp->sectorsize, NULL);
if (d_hdr == NULL)
return (-1);
off = 0;
m_hdr->magic = GV_GET64(be);
magic_machdep = *((uint64_t *)&d_hdr[0]);
/*
* The big endian machines will have a reverse of GV_OLD_MAGIC, so we
* need to decide if we are running on a big endian machine as well as
* checking the magic against the reverse of GV_OLD_MAGIC.
*/
be = (m_hdr->magic == magic_machdep);
if (m_hdr->magic == GV_MAGIC) {
m_hdr->config_length = GV_GET64(be);
off = 16;
bcopy(d_hdr + off, m_hdr->label.sysname, GV_HOSTNAME_LEN);
off += GV_HOSTNAME_LEN;
bcopy(d_hdr + off, m_hdr->label.name, GV_MAXDRIVENAME);
off += GV_MAXDRIVENAME;
m_hdr->label.date_of_birth.tv_sec = GV_GET64(be);
m_hdr->label.date_of_birth.tv_usec = GV_GET64(be);
m_hdr->label.last_update.tv_sec = GV_GET64(be);
m_hdr->label.last_update.tv_usec = GV_GET64(be);
m_hdr->label.drive_size = GV_GET64(be);
} else if (m_hdr->magic != GV_OLD_MAGIC &&
m_hdr->magic != le64toh(GV_OLD_MAGIC)) {
/* Not a gvinum drive. */
g_free(d_hdr);
return (-1);
} else if (gv_legacy_header_type(d_hdr, be) == GV_LEGACY_SPARC64) {
G_VINUM_DEBUG(1, "detected legacy sparc64 header");
m_hdr->magic = GV_MAGIC;
/* Legacy sparc64 on-disk header */
m_hdr->config_length = GV_GET64(be);
bcopy(d_hdr + 16, m_hdr->label.sysname, GV_HOSTNAME_LEN);
off += GV_HOSTNAME_LEN;
bcopy(d_hdr + 48, m_hdr->label.name, GV_MAXDRIVENAME);
off += GV_MAXDRIVENAME;
m_hdr->label.date_of_birth.tv_sec = GV_GET64(be);
m_hdr->label.date_of_birth.tv_usec = GV_GET64(be);
m_hdr->label.last_update.tv_sec = GV_GET64(be);
m_hdr->label.last_update.tv_usec = GV_GET64(be);
m_hdr->label.drive_size = GV_GET64(be);
} else if (gv_legacy_header_type(d_hdr, be) == GV_LEGACY_POWERPC) {
G_VINUM_DEBUG(1, "detected legacy PowerPC header");
m_hdr->magic = GV_MAGIC;
/* legacy 32-bit big endian on-disk header */
m_hdr->config_length = GV_GET32(be);
bcopy(d_hdr + off, m_hdr->label.sysname, GV_HOSTNAME_LEN);
off += GV_HOSTNAME_LEN;
bcopy(d_hdr + off, m_hdr->label.name, GV_MAXDRIVENAME);
off += GV_MAXDRIVENAME;
m_hdr->label.date_of_birth.tv_sec = GV_GET32(be);
m_hdr->label.date_of_birth.tv_usec = GV_GET32(be);
m_hdr->label.last_update.tv_sec = GV_GET32(be);
m_hdr->label.last_update.tv_usec = GV_GET32(be);
m_hdr->label.drive_size = GV_GET64(be);
} else if (gv_legacy_header_type(d_hdr, be) == GV_LEGACY_I386) {
G_VINUM_DEBUG(1, "detected legacy i386 header");
m_hdr->magic = GV_MAGIC;
/* legacy i386 on-disk header */
m_hdr->config_length = GV_GET32(le);
bcopy(d_hdr + off, m_hdr->label.sysname, GV_HOSTNAME_LEN);
off += GV_HOSTNAME_LEN;
bcopy(d_hdr + off, m_hdr->label.name, GV_MAXDRIVENAME);
off += GV_MAXDRIVENAME;
m_hdr->label.date_of_birth.tv_sec = GV_GET32(le);
m_hdr->label.date_of_birth.tv_usec = GV_GET32(le);
m_hdr->label.last_update.tv_sec = GV_GET32(le);
m_hdr->label.last_update.tv_usec = GV_GET32(le);
m_hdr->label.drive_size = GV_GET64(le);
} else {
G_VINUM_DEBUG(1, "detected legacy amd64 header");
m_hdr->magic = GV_MAGIC;
/* legacy amd64 on-disk header */
m_hdr->config_length = GV_GET64(le);
bcopy(d_hdr + 16, m_hdr->label.sysname, GV_HOSTNAME_LEN);
off += GV_HOSTNAME_LEN;
bcopy(d_hdr + 48, m_hdr->label.name, GV_MAXDRIVENAME);
off += GV_MAXDRIVENAME;
m_hdr->label.date_of_birth.tv_sec = GV_GET64(le);
m_hdr->label.date_of_birth.tv_usec = GV_GET64(le);
m_hdr->label.last_update.tv_sec = GV_GET64(le);
m_hdr->label.last_update.tv_usec = GV_GET64(le);
m_hdr->label.drive_size = GV_GET64(le);
}
g_free(d_hdr);
return (0);
}
/* Write out the gvinum header. */
int
gv_write_header(struct g_consumer *cp, struct gv_hdr *m_hdr)
{
uint8_t d_hdr[GV_HDR_LEN];
int off, ret;
#define GV_SET64BE(field) \
do { \
*((uint64_t *)&d_hdr[off]) = htobe64(field); \
off += 8; \
} while (0)
KASSERT(m_hdr != NULL, ("gv_write_header: null m_hdr"));
off = 0;
memset(d_hdr, 0, GV_HDR_LEN);
GV_SET64BE(m_hdr->magic);
GV_SET64BE(m_hdr->config_length);
off = 16;
bcopy(m_hdr->label.sysname, d_hdr + off, GV_HOSTNAME_LEN);
off += GV_HOSTNAME_LEN;
bcopy(m_hdr->label.name, d_hdr + off, GV_MAXDRIVENAME);
off += GV_MAXDRIVENAME;
GV_SET64BE(m_hdr->label.date_of_birth.tv_sec);
GV_SET64BE(m_hdr->label.date_of_birth.tv_usec);
GV_SET64BE(m_hdr->label.last_update.tv_sec);
GV_SET64BE(m_hdr->label.last_update.tv_usec);
GV_SET64BE(m_hdr->label.drive_size);
ret = g_write_data(cp, GV_HDR_OFFSET, d_hdr, GV_HDR_LEN);
return (ret);
}
void
gv_config_new_drive(struct gv_drive *d)
{
struct gv_hdr *vhdr;
struct gv_freelist *fl;
KASSERT(d != NULL, ("config_new_drive: NULL d"));
vhdr = g_malloc(sizeof(*vhdr), M_WAITOK | M_ZERO);
vhdr->magic = GV_MAGIC;
vhdr->config_length = GV_CFG_LEN;
mtx_lock(&hostname_mtx);
bcopy(G_hostname, vhdr->label.sysname, GV_HOSTNAME_LEN);
mtx_unlock(&hostname_mtx);
strncpy(vhdr->label.name, d->name, GV_MAXDRIVENAME);
microtime(&vhdr->label.date_of_birth);
d->hdr = vhdr;
LIST_INIT(&d->subdisks);
LIST_INIT(&d->freelist);
fl = g_malloc(sizeof(struct gv_freelist), M_WAITOK | M_ZERO);
fl->offset = GV_DATA_START;
fl->size = d->avail;
LIST_INSERT_HEAD(&d->freelist, fl, freelist);
d->freelist_entries = 1;
d->bqueue = g_malloc(sizeof(struct bio_queue_head), M_WAITOK | M_ZERO);
bioq_init(d->bqueue);
mtx_init(&d->bqueue_mtx, "gv_drive", NULL, MTX_DEF);
kproc_create(gv_drive_worker, d, NULL, 0, 0, "gv_d %s", d->name);
d->flags |= GV_DRIVE_THREAD_ACTIVE;
}
void
gv_save_config_all(struct gv_softc *sc)
{
struct gv_drive *d;
g_topology_assert();
LIST_FOREACH(d, &sc->drives, drive) {
if (d->geom == NULL)
continue;
gv_save_config(NULL, d, sc);
}
}
/* Save the vinum configuration back to disk. */
void
gv_save_config(struct g_consumer *cp, struct gv_drive *d, struct gv_softc *sc)
{
struct g_geom *gp;
struct g_consumer *cp2;
struct gv_hdr *vhdr, *hdr;
struct sbuf *sb;
int error;
g_topology_assert();
KASSERT(d != NULL, ("gv_save_config: null d"));
KASSERT(sc != NULL, ("gv_save_config: null sc"));
/*
* We can't save the config on a drive that isn't up, but drives that
* were just created aren't officially up yet, so we check a special
* flag.
*/
if ((d->state != GV_DRIVE_UP) && !(d->flags && GV_DRIVE_NEWBORN))
return;
if (cp == NULL) {
gp = d->geom;
KASSERT(gp != NULL, ("gv_save_config: null gp"));
cp2 = LIST_FIRST(&gp->consumer);
KASSERT(cp2 != NULL, ("gv_save_config: null cp2"));
} else
cp2 = cp;
vhdr = g_malloc(GV_HDR_LEN, M_WAITOK | M_ZERO);
vhdr->magic = GV_MAGIC;
vhdr->config_length = GV_CFG_LEN;
hdr = d->hdr;
if (hdr == NULL) {
G_VINUM_DEBUG(0, "drive %s has NULL hdr", d->name);
g_free(vhdr);
return;
}
microtime(&hdr->label.last_update);
bcopy(&hdr->label, &vhdr->label, sizeof(struct gv_label));
sb = sbuf_new(NULL, NULL, GV_CFG_LEN, SBUF_FIXEDLEN);
gv_format_config(sc, sb, 1, NULL);
sbuf_finish(sb);
error = g_access(cp2, 0, 1, 0);
if (error) {
G_VINUM_DEBUG(0, "g_access failed on drive %s, errno %d",
d->name, error);
sbuf_delete(sb);
g_free(vhdr);
return;
}
g_topology_unlock();
do {
error = gv_write_header(cp2, vhdr);
if (error) {
G_VINUM_DEBUG(0, "writing vhdr failed on drive %s, "
"errno %d", d->name, error);
break;
}
error = g_write_data(cp2, GV_CFG_OFFSET, sbuf_data(sb),
GV_CFG_LEN);
if (error) {
G_VINUM_DEBUG(0, "writing first config copy failed "
"on drive %s, errno %d", d->name, error);
break;
}
error = g_write_data(cp2, GV_CFG_OFFSET + GV_CFG_LEN,
sbuf_data(sb), GV_CFG_LEN);
if (error)
G_VINUM_DEBUG(0, "writing second config copy failed "
"on drive %s, errno %d", d->name, error);
} while (0);
g_topology_lock();
g_access(cp2, 0, -1, 0);
sbuf_delete(sb);
g_free(vhdr);
if (d->geom != NULL)
gv_drive_modify(d);
}
/* This resembles g_slice_access(). */
static int
gv_drive_access(struct g_provider *pp, int dr, int dw, int de)
{
struct g_geom *gp;
struct g_consumer *cp;
struct g_provider *pp2;
struct gv_drive *d;
struct gv_sd *s, *s2;
int error;
gp = pp->geom;
cp = LIST_FIRST(&gp->consumer);
if (cp == NULL)
return (0);
d = gp->softc;
if (d == NULL)
return (0);
s = pp->private;
KASSERT(s != NULL, ("gv_drive_access: NULL s"));
LIST_FOREACH(s2, &d->subdisks, from_drive) {
if (s == s2)
continue;
if (s->drive_offset + s->size <= s2->drive_offset)
continue;
if (s2->drive_offset + s2->size <= s->drive_offset)
continue;
/* Overlap. */
pp2 = s2->provider;
KASSERT(s2 != NULL, ("gv_drive_access: NULL s2"));
if ((pp->acw + dw) > 0 && pp2->ace > 0)
return (EPERM);
if ((pp->ace + de) > 0 && pp2->acw > 0)
return (EPERM);
}
error = g_access(cp, dr, dw, de);
return (error);
}
static void
gv_drive_done(struct bio *bp)
{
struct gv_drive *d;
/* Put the BIO on the worker queue again. */
d = bp->bio_from->geom->softc;
bp->bio_cflags |= GV_BIO_DONE;
mtx_lock(&d->bqueue_mtx);
bioq_insert_tail(d->bqueue, bp);
wakeup(d);
mtx_unlock(&d->bqueue_mtx);
}
static void
gv_drive_start(struct bio *bp)
{
struct gv_drive *d;
struct gv_sd *s;
switch (bp->bio_cmd) {
case BIO_READ:
case BIO_WRITE:
case BIO_DELETE:
break;
case BIO_GETATTR:
default:
g_io_deliver(bp, EOPNOTSUPP);
return;
}
s = bp->bio_to->private;
if ((s->state == GV_SD_DOWN) || (s->state == GV_SD_STALE)) {
g_io_deliver(bp, ENXIO);
return;
}
d = bp->bio_to->geom->softc;
/*
* Put the BIO on the worker queue, where the worker thread will pick
* it up.
*/
mtx_lock(&d->bqueue_mtx);
bioq_disksort(d->bqueue, bp);
wakeup(d);
mtx_unlock(&d->bqueue_mtx);
}
static void
gv_drive_worker(void *arg)
{
struct bio *bp, *cbp;
struct g_geom *gp;
struct g_provider *pp;
struct gv_drive *d;
struct gv_sd *s;
int error;
d = arg;
mtx_lock(&d->bqueue_mtx);
for (;;) {
/* We were signaled to exit. */
if (d->flags & GV_DRIVE_THREAD_DIE)
break;
/* Take the first BIO from out queue. */
bp = bioq_takefirst(d->bqueue);
if (bp == NULL) {
msleep(d, &d->bqueue_mtx, PRIBIO, "-", hz/10);
continue;
}
mtx_unlock(&d->bqueue_mtx);
pp = bp->bio_to;
gp = pp->geom;
/* Completed request. */
if (bp->bio_cflags & GV_BIO_DONE) {
error = bp->bio_error;
/* Deliver the original request. */
g_std_done(bp);
/* The request had an error, we need to clean up. */
if (error != 0) {
g_topology_lock();
gv_set_drive_state(d, GV_DRIVE_DOWN,
GV_SETSTATE_FORCE | GV_SETSTATE_CONFIG);
g_topology_unlock();
g_post_event(gv_drive_dead, d, M_WAITOK, d,
NULL);
}
/* New request, needs to be sent downwards. */
} else {
s = pp->private;
if ((s->state == GV_SD_DOWN) ||
(s->state == GV_SD_STALE)) {
g_io_deliver(bp, ENXIO);
mtx_lock(&d->bqueue_mtx);
continue;
}
if (bp->bio_offset > s->size) {
g_io_deliver(bp, EINVAL);
mtx_lock(&d->bqueue_mtx);
continue;
}
cbp = g_clone_bio(bp);
if (cbp == NULL) {
g_io_deliver(bp, ENOMEM);
mtx_lock(&d->bqueue_mtx);
continue;
}
if (cbp->bio_offset + cbp->bio_length > s->size)
cbp->bio_length = s->size -
cbp->bio_offset;
cbp->bio_done = gv_drive_done;
cbp->bio_offset += s->drive_offset;
g_io_request(cbp, LIST_FIRST(&gp->consumer));
}
mtx_lock(&d->bqueue_mtx);
}
while ((bp = bioq_takefirst(d->bqueue)) != NULL) {
mtx_unlock(&d->bqueue_mtx);
if (bp->bio_cflags & GV_BIO_DONE)
g_std_done(bp);
else
g_io_deliver(bp, ENXIO);
mtx_lock(&d->bqueue_mtx);
}
mtx_unlock(&d->bqueue_mtx);
d->flags |= GV_DRIVE_THREAD_DEAD;
kproc_exit(ENXIO);
}
static void
gv_drive_orphan(struct g_consumer *cp)
{
struct g_geom *gp;
struct gv_drive *d;
g_topology_assert();
gp = cp->geom;
g_trace(G_T_TOPOLOGY, "gv_drive_orphan(%s)", gp->name);
d = gp->softc;
if (d != NULL) {
gv_set_drive_state(d, GV_DRIVE_DOWN,
GV_SETSTATE_FORCE | GV_SETSTATE_CONFIG);
g_post_event(gv_drive_dead, d, M_WAITOK, d, NULL);
} else
g_wither_geom(gp, ENXIO);
}
static struct g_geom *
gv_drive_taste(struct g_class *mp, struct g_provider *pp, int flags __unused)
{
struct g_geom *gp, *gp2;
struct g_consumer *cp;
struct gv_drive *d;
struct gv_sd *s;
struct gv_softc *sc;
struct gv_freelist *fl;
struct gv_hdr *vhdr;
int error;
char *buf, errstr[ERRBUFSIZ];
vhdr = NULL;
d = NULL;
g_trace(G_T_TOPOLOGY, "gv_drive_taste(%s, %s)", mp->name, pp->name);
g_topology_assert();
/* Find the VINUM class and its associated geom. */
gp2 = find_vinum_geom();
if (gp2 == NULL)
return (NULL);
sc = gp2->softc;
gp = g_new_geomf(mp, "%s.vinumdrive", pp->name);
gp->start = gv_drive_start;
gp->orphan = gv_drive_orphan;
gp->access = gv_drive_access;
gp->start = gv_drive_start;
cp = g_new_consumer(gp);
g_attach(cp, pp);
error = g_access(cp, 1, 0, 0);
if (error) {
g_detach(cp);
g_destroy_consumer(cp);
g_destroy_geom(gp);
return (NULL);
}
g_topology_unlock();
/* Now check if the provided slice is a valid vinum drive. */
do {
vhdr = g_malloc(GV_HDR_LEN, M_WAITOK | M_ZERO);
error = gv_read_header(cp, vhdr);
if (error) {
g_free(vhdr);
break;
}
/* A valid vinum drive, let's parse the on-disk information. */
buf = g_read_data(cp, GV_CFG_OFFSET, GV_CFG_LEN, NULL);
if (buf == NULL) {
g_free(vhdr);
break;
}
g_topology_lock();
gv_parse_config(sc, buf, 1);
g_free(buf);
/*
* Let's see if this drive is already known in the
* configuration.
*/
d = gv_find_drive(sc, vhdr->label.name);
/* We already know about this drive. */
if (d != NULL) {
/* Check if this drive already has a geom. */
if (d->geom != NULL) {
g_topology_unlock();
g_free(vhdr);
break;
}
bcopy(vhdr, d->hdr, sizeof(*vhdr));
g_free(vhdr);
/* This is a new drive. */
} else {
d = g_malloc(sizeof(*d), M_WAITOK | M_ZERO);
/* Initialize all needed variables. */
d->size = pp->mediasize - GV_DATA_START;
d->avail = d->size;
d->hdr = vhdr;
strncpy(d->name, vhdr->label.name, GV_MAXDRIVENAME);
LIST_INIT(&d->subdisks);
LIST_INIT(&d->freelist);
/* We also need a freelist entry. */
fl = g_malloc(sizeof(*fl), M_WAITOK | M_ZERO);
fl->offset = GV_DATA_START;
fl->size = d->avail;
LIST_INSERT_HEAD(&d->freelist, fl, freelist);
d->freelist_entries = 1;
/* Save it into the main configuration. */
LIST_INSERT_HEAD(&sc->drives, d, drive);
}
/*
* Create bio queue, queue mutex and a worker thread, if
* necessary.
*/
if (d->bqueue == NULL) {
d->bqueue = g_malloc(sizeof(struct bio_queue_head),
M_WAITOK | M_ZERO);
bioq_init(d->bqueue);
}
if (mtx_initialized(&d->bqueue_mtx) == 0)
mtx_init(&d->bqueue_mtx, "gv_drive", NULL, MTX_DEF);
if (!(d->flags & GV_DRIVE_THREAD_ACTIVE)) {
kproc_create(gv_drive_worker, d, NULL, 0, 0,
"gv_d %s", d->name);
d->flags |= GV_DRIVE_THREAD_ACTIVE;
}
g_access(cp, -1, 0, 0);
gp->softc = d;
d->geom = gp;
d->vinumconf = sc;
strncpy(d->device, pp->name, GV_MAXDRIVENAME);
/*
* Find out which subdisks belong to this drive and crosslink
* them.
*/
LIST_FOREACH(s, &sc->subdisks, sd) {
if (!strncmp(s->drive, d->name, GV_MAXDRIVENAME))
/* XXX: errors ignored */
gv_sd_to_drive(sc, d, s, errstr,
sizeof(errstr));
}
/* This drive is now up for sure. */
gv_set_drive_state(d, GV_DRIVE_UP, 0);
/*
* If there are subdisks on this drive, we need to create
* providers for them.
*/
if (d->sdcount)
gv_drive_modify(d);
return (gp);
} while (0);
g_topology_lock();
g_access(cp, -1, 0, 0);
g_detach(cp);
g_destroy_consumer(cp);
g_destroy_geom(gp);
return (NULL);
}
/*
* Modify the providers for the given drive 'd'. It is assumed that the
* subdisk list of 'd' is already correctly set up.
*/
void
gv_drive_modify(struct gv_drive *d)
{
struct g_geom *gp;
struct g_consumer *cp;
struct g_provider *pp, *pp2;
struct gv_sd *s;
KASSERT(d != NULL, ("gv_drive_modify: null d"));
gp = d->geom;
KASSERT(gp != NULL, ("gv_drive_modify: null gp"));
cp = LIST_FIRST(&gp->consumer);
KASSERT(cp != NULL, ("gv_drive_modify: null cp"));
pp = cp->provider;
KASSERT(pp != NULL, ("gv_drive_modify: null pp"));
g_topology_assert();
LIST_FOREACH(s, &d->subdisks, from_drive) {
/* This subdisk already has a provider. */
if (s->provider != NULL)
continue;
pp2 = g_new_providerf(gp, "gvinum/sd/%s", s->name);
pp2->mediasize = s->size;
pp2->sectorsize = pp->sectorsize;
g_error_provider(pp2, 0);
s->provider = pp2;
pp2->private = s;
}
}
static void
gv_drive_dead(void *arg, int flag)
{
struct g_geom *gp;
struct g_consumer *cp;
struct gv_drive *d;
struct gv_sd *s;
g_topology_assert();
KASSERT(arg != NULL, ("gv_drive_dead: NULL arg"));
if (flag == EV_CANCEL)
return;
d = arg;
if (d->state != GV_DRIVE_DOWN)
return;
g_trace(G_T_TOPOLOGY, "gv_drive_dead(%s)", d->name);
gp = d->geom;
if (gp == NULL)
return;
LIST_FOREACH(cp, &gp->consumer, consumer) {
if (cp->nstart != cp->nend) {
G_VINUM_DEBUG(0, "dead drive '%s' still has "
"active requests, cannot detach consumer",
d->name);
g_post_event(gv_drive_dead, d, M_WAITOK, d,
NULL);
return;
}
if (cp->acr != 0 || cp->acw != 0 || cp->ace != 0)
g_access(cp, -cp->acr, -cp->acw, -cp->ace);
}
G_VINUM_DEBUG(1, "lost drive '%s'", d->name);
d->geom = NULL;
LIST_FOREACH(s, &d->subdisks, from_drive) {
s->provider = NULL;
s->consumer = NULL;
}
gv_kill_drive_thread(d);
gp->softc = NULL;
g_wither_geom(gp, ENXIO);
}
static int
gv_drive_destroy_geom(struct gctl_req *req, struct g_class *mp,
struct g_geom *gp)
{
struct gv_drive *d;
g_trace(G_T_TOPOLOGY, "gv_drive_destroy_geom: %s", gp->name);
g_topology_assert();
d = gp->softc;
gv_kill_drive_thread(d);
g_wither_geom(gp, ENXIO);
return (0);
}
#define VINUMDRIVE_CLASS_NAME "VINUMDRIVE"
static struct g_class g_vinum_drive_class = {
.name = VINUMDRIVE_CLASS_NAME,
.version = G_VERSION,
.taste = gv_drive_taste,
.destroy_geom = gv_drive_destroy_geom
};
DECLARE_GEOM_CLASS(g_vinum_drive_class, g_vinum_drive);
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