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freebsd/sys/geom/vinum/geom_vinum_drive.c
Jamie Gritton 76ca6f88da Place hostnames and similar information fully under the prison system. 
The system hostname is now stored in prison0, and the global variable
"hostname" has been removed, as has the hostname_mtx mutex.  Jails may
have their own host information, or they may inherit it from the
parent/system.  The proper way to read the hostname is via
getcredhostname(), which will copy either the hostname associated with
the passed cred, or the system hostname if you pass NULL.  The system
hostname can still be accessed directly (and without locking) at
prison0.pr_host, but that should be avoided where possible.

The "similar information" referred to is domainname, hostid, and
hostuuid, which have also become prison parameters and had their
associated global variables removed.

Approved by:	bz (mentor)
2009-05-29 21:27:12 +00:00

347 lines
11 KiB
C
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/*-
* Copyright (c) 2004, 2005, 2007 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/endian.h>
#include <sys/malloc.h>
#include <sys/systm.h>
#include <geom/geom.h>
#include <geom/vinum/geom_vinum_var.h>
#include <geom/vinum/geom_vinum.h>
#define GV_LEGACY_I386 0
#define GV_LEGACY_AMD64 1
#define GV_LEGACY_SPARC64 2
#define GV_LEGACY_POWERPC 3
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);
}
/* Save the vinum configuration back to each involved disk. */
void
gv_save_config(struct gv_softc *sc)
{
struct g_consumer *cp;
struct gv_drive *d;
struct gv_hdr *vhdr, *hdr;
struct sbuf *sb;
struct timeval last_update;
int error;
KASSERT(sc != NULL, ("gv_save_config: null sc"));
vhdr = g_malloc(GV_HDR_LEN, M_WAITOK | M_ZERO);
vhdr->magic = GV_MAGIC;
vhdr->config_length = GV_CFG_LEN;
microtime(&last_update);
sb = sbuf_new(NULL, NULL, GV_CFG_LEN, SBUF_FIXEDLEN);
gv_format_config(sc, sb, 1, NULL);
sbuf_finish(sb);
LIST_FOREACH(d, &sc->drives, drive) {
/*
* 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)
continue;
cp = d->consumer;
if (cp == NULL) {
G_VINUM_DEBUG(0, "drive '%s' has no consumer!",
d->name);
continue;
}
hdr = d->hdr;
if (hdr == NULL) {
G_VINUM_DEBUG(0, "drive '%s' has no header",
d->name);
g_free(vhdr);
continue;
}
bcopy(&last_update, &hdr->label.last_update,
sizeof(struct timeval));
bcopy(&hdr->label, &vhdr->label, sizeof(struct gv_label));
g_topology_lock();
error = g_access(cp, 0, 1, 0);
if (error) {
G_VINUM_DEBUG(0, "g_access failed on "
"drive %s, errno %d", d->name, error);
g_topology_unlock();
continue;
}
g_topology_unlock();
error = gv_write_header(cp, vhdr);
if (error) {
G_VINUM_DEBUG(0, "writing vhdr failed on drive %s, "
"errno %d", d->name, error);
g_topology_lock();
g_access(cp, 0, -1, 0);
g_topology_unlock();
continue;
}
/* First config copy. */
error = g_write_data(cp, 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);
g_topology_lock();
g_access(cp, 0, -1, 0);
g_topology_unlock();
continue;
}
/* Second config copy. */
error = g_write_data(cp, 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);
g_topology_lock();
g_access(cp, 0, -1, 0);
g_topology_unlock();
}
sbuf_delete(sb);
g_free(vhdr);
}
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