353 lines
11 KiB
C
353 lines
11 KiB
C
/*-
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* Copyright (c) 2004, 2005, 2007 Lukas Ertl
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/endian.h>
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#include <sys/malloc.h>
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#include <sys/sbuf.h>
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#include <sys/systm.h>
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#include <geom/geom.h>
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#include <geom/vinum/geom_vinum_var.h>
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#include <geom/vinum/geom_vinum.h>
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#define GV_LEGACY_I386 0
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#define GV_LEGACY_AMD64 1
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#define GV_LEGACY_SPARC64 2
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#define GV_LEGACY_POWERPC 3
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static int gv_legacy_header_type(uint8_t *, int);
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/*
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* Here are the "offset (size)" for the various struct gv_hdr fields,
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* for the legacy i386 (or 32-bit powerpc), legacy amd64 (or sparc64), and
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* current (cpu & endian agnostic) versions of the on-disk format of the vinum
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* header structure:
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*
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* i386 amd64 current field
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* -------- -------- -------- -----
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* 0 ( 8) 0 ( 8) 0 ( 8) magic
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* 8 ( 4) 8 ( 8) 8 ( 8) config_length
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* 12 (32) 16 (32) 16 (32) label.sysname
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* 44 (32) 48 (32) 48 (32) label.name
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* 76 ( 4) 80 ( 8) 80 ( 8) label.date_of_birth.tv_sec
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* 80 ( 4) 88 ( 8) 88 ( 8) label.date_of_birth.tv_usec
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* 84 ( 4) 96 ( 8) 96 ( 8) label.last_update.tv_sec
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* 88 ( 4) 104 ( 8) 104 ( 8) label.last_update.tv_usec
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* 92 ( 8) 112 ( 8) 112 ( 8) label.drive_size
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* ======== ======== ========
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* 100 120 120 total size
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*
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* NOTE: i386 and amd64 formats are stored as little-endian; the current
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* format uses big-endian (network order).
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*/
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/* Checks for legacy format depending on platform. */
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static int
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gv_legacy_header_type(uint8_t *hdr, int bigendian)
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{
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uint32_t *i32;
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int arch_32, arch_64, i;
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/* Set arch according to endianness. */
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if (bigendian) {
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arch_32 = GV_LEGACY_POWERPC;
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arch_64 = GV_LEGACY_SPARC64;
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} else {
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arch_32 = GV_LEGACY_I386;
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arch_64 = GV_LEGACY_AMD64;
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}
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/* if non-empty hostname overlaps 64-bit config_length */
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i32 = (uint32_t *)(hdr + 12);
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if (*i32 != 0)
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return (arch_32);
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/* check for non-empty hostname */
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if (hdr[16] != 0)
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return (arch_64);
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/* check bytes past 32-bit structure */
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for (i = 100; i < 120; i++)
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if (hdr[i] != 0)
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return (arch_32);
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/* check for overlapping timestamp */
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i32 = (uint32_t *)(hdr + 84);
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if (*i32 == 0)
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return (arch_64);
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return (arch_32);
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}
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/*
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* Read the header while taking magic number into account, and write it to
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* destination pointer.
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*/
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int
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gv_read_header(struct g_consumer *cp, struct gv_hdr *m_hdr)
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{
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struct g_provider *pp;
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uint64_t magic_machdep;
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uint8_t *d_hdr;
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int be, off;
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#define GV_GET32(endian) \
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endian##32toh(*((uint32_t *)&d_hdr[off])); \
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off += 4
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#define GV_GET64(endian) \
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endian##64toh(*((uint64_t *)&d_hdr[off])); \
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off += 8
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KASSERT(m_hdr != NULL, ("gv_read_header: null m_hdr"));
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KASSERT(cp != NULL, ("gv_read_header: null cp"));
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pp = cp->provider;
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KASSERT(pp != NULL, ("gv_read_header: null pp"));
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if ((GV_HDR_OFFSET % pp->sectorsize) != 0 ||
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(GV_HDR_LEN % pp->sectorsize) != 0)
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return (ENODEV);
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d_hdr = g_read_data(cp, GV_HDR_OFFSET, pp->sectorsize, NULL);
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if (d_hdr == NULL)
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return (-1);
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off = 0;
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m_hdr->magic = GV_GET64(be);
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magic_machdep = *((uint64_t *)&d_hdr[0]);
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/*
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* The big endian machines will have a reverse of GV_OLD_MAGIC, so we
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* need to decide if we are running on a big endian machine as well as
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* checking the magic against the reverse of GV_OLD_MAGIC.
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*/
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be = (m_hdr->magic == magic_machdep);
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if (m_hdr->magic == GV_MAGIC) {
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m_hdr->config_length = GV_GET64(be);
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off = 16;
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bcopy(d_hdr + off, m_hdr->label.sysname, GV_HOSTNAME_LEN);
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off += GV_HOSTNAME_LEN;
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bcopy(d_hdr + off, m_hdr->label.name, GV_MAXDRIVENAME);
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off += GV_MAXDRIVENAME;
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m_hdr->label.date_of_birth.tv_sec = GV_GET64(be);
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m_hdr->label.date_of_birth.tv_usec = GV_GET64(be);
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m_hdr->label.last_update.tv_sec = GV_GET64(be);
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m_hdr->label.last_update.tv_usec = GV_GET64(be);
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m_hdr->label.drive_size = GV_GET64(be);
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} else if (m_hdr->magic != GV_OLD_MAGIC &&
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m_hdr->magic != le64toh(GV_OLD_MAGIC)) {
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/* Not a gvinum drive. */
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g_free(d_hdr);
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return (-1);
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} else if (gv_legacy_header_type(d_hdr, be) == GV_LEGACY_SPARC64) {
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G_VINUM_DEBUG(1, "detected legacy sparc64 header");
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m_hdr->magic = GV_MAGIC;
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/* Legacy sparc64 on-disk header */
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m_hdr->config_length = GV_GET64(be);
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bcopy(d_hdr + 16, m_hdr->label.sysname, GV_HOSTNAME_LEN);
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off += GV_HOSTNAME_LEN;
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bcopy(d_hdr + 48, m_hdr->label.name, GV_MAXDRIVENAME);
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off += GV_MAXDRIVENAME;
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m_hdr->label.date_of_birth.tv_sec = GV_GET64(be);
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m_hdr->label.date_of_birth.tv_usec = GV_GET64(be);
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m_hdr->label.last_update.tv_sec = GV_GET64(be);
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m_hdr->label.last_update.tv_usec = GV_GET64(be);
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m_hdr->label.drive_size = GV_GET64(be);
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} else if (gv_legacy_header_type(d_hdr, be) == GV_LEGACY_POWERPC) {
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G_VINUM_DEBUG(1, "detected legacy PowerPC header");
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m_hdr->magic = GV_MAGIC;
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/* legacy 32-bit big endian on-disk header */
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m_hdr->config_length = GV_GET32(be);
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bcopy(d_hdr + off, m_hdr->label.sysname, GV_HOSTNAME_LEN);
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off += GV_HOSTNAME_LEN;
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bcopy(d_hdr + off, m_hdr->label.name, GV_MAXDRIVENAME);
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off += GV_MAXDRIVENAME;
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m_hdr->label.date_of_birth.tv_sec = GV_GET32(be);
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m_hdr->label.date_of_birth.tv_usec = GV_GET32(be);
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m_hdr->label.last_update.tv_sec = GV_GET32(be);
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m_hdr->label.last_update.tv_usec = GV_GET32(be);
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m_hdr->label.drive_size = GV_GET64(be);
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} else if (gv_legacy_header_type(d_hdr, be) == GV_LEGACY_I386) {
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G_VINUM_DEBUG(1, "detected legacy i386 header");
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m_hdr->magic = GV_MAGIC;
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/* legacy i386 on-disk header */
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m_hdr->config_length = GV_GET32(le);
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bcopy(d_hdr + off, m_hdr->label.sysname, GV_HOSTNAME_LEN);
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off += GV_HOSTNAME_LEN;
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bcopy(d_hdr + off, m_hdr->label.name, GV_MAXDRIVENAME);
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off += GV_MAXDRIVENAME;
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m_hdr->label.date_of_birth.tv_sec = GV_GET32(le);
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m_hdr->label.date_of_birth.tv_usec = GV_GET32(le);
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m_hdr->label.last_update.tv_sec = GV_GET32(le);
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m_hdr->label.last_update.tv_usec = GV_GET32(le);
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m_hdr->label.drive_size = GV_GET64(le);
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} else {
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G_VINUM_DEBUG(1, "detected legacy amd64 header");
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m_hdr->magic = GV_MAGIC;
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/* legacy amd64 on-disk header */
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m_hdr->config_length = GV_GET64(le);
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bcopy(d_hdr + 16, m_hdr->label.sysname, GV_HOSTNAME_LEN);
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off += GV_HOSTNAME_LEN;
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bcopy(d_hdr + 48, m_hdr->label.name, GV_MAXDRIVENAME);
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off += GV_MAXDRIVENAME;
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m_hdr->label.date_of_birth.tv_sec = GV_GET64(le);
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m_hdr->label.date_of_birth.tv_usec = GV_GET64(le);
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m_hdr->label.last_update.tv_sec = GV_GET64(le);
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m_hdr->label.last_update.tv_usec = GV_GET64(le);
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m_hdr->label.drive_size = GV_GET64(le);
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}
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g_free(d_hdr);
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return (0);
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}
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/* Write out the gvinum header. */
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int
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gv_write_header(struct g_consumer *cp, struct gv_hdr *m_hdr)
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{
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uint8_t d_hdr[GV_HDR_LEN];
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int off, ret;
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#define GV_SET64BE(field) \
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do { \
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*((uint64_t *)&d_hdr[off]) = htobe64(field); \
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off += 8; \
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} while (0)
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KASSERT(m_hdr != NULL, ("gv_write_header: null m_hdr"));
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off = 0;
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memset(d_hdr, 0, GV_HDR_LEN);
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GV_SET64BE(m_hdr->magic);
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GV_SET64BE(m_hdr->config_length);
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off = 16;
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bcopy(m_hdr->label.sysname, d_hdr + off, GV_HOSTNAME_LEN);
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off += GV_HOSTNAME_LEN;
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bcopy(m_hdr->label.name, d_hdr + off, GV_MAXDRIVENAME);
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off += GV_MAXDRIVENAME;
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GV_SET64BE(m_hdr->label.date_of_birth.tv_sec);
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GV_SET64BE(m_hdr->label.date_of_birth.tv_usec);
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GV_SET64BE(m_hdr->label.last_update.tv_sec);
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GV_SET64BE(m_hdr->label.last_update.tv_usec);
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GV_SET64BE(m_hdr->label.drive_size);
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ret = g_write_data(cp, GV_HDR_OFFSET, d_hdr, GV_HDR_LEN);
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return (ret);
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}
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/* Save the vinum configuration back to each involved disk. */
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void
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gv_save_config(struct gv_softc *sc)
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{
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struct g_consumer *cp;
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struct gv_drive *d;
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struct gv_hdr *vhdr, *hdr;
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struct sbuf *sb;
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struct timeval last_update;
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int error;
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KASSERT(sc != NULL, ("gv_save_config: null sc"));
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vhdr = g_malloc(GV_HDR_LEN, M_WAITOK | M_ZERO);
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vhdr->magic = GV_MAGIC;
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vhdr->config_length = GV_CFG_LEN;
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microtime(&last_update);
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sb = sbuf_new(NULL, NULL, GV_CFG_LEN, SBUF_FIXEDLEN);
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gv_format_config(sc, sb, 1, NULL);
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sbuf_finish(sb);
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LIST_FOREACH(d, &sc->drives, drive) {
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/*
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* We can't save the config on a drive that isn't up, but
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* drives that were just created aren't officially up yet, so
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* we check a special flag.
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*/
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if (d->state != GV_DRIVE_UP)
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continue;
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cp = d->consumer;
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if (cp == NULL) {
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G_VINUM_DEBUG(0, "drive '%s' has no consumer!",
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d->name);
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continue;
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}
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hdr = d->hdr;
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if (hdr == NULL) {
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G_VINUM_DEBUG(0, "drive '%s' has no header",
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d->name);
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g_free(vhdr);
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continue;
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}
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bcopy(&last_update, &hdr->label.last_update,
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sizeof(struct timeval));
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bcopy(&hdr->label, &vhdr->label, sizeof(struct gv_label));
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g_topology_lock();
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error = g_access(cp, 0, 1, 0);
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if (error) {
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G_VINUM_DEBUG(0, "g_access failed on "
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"drive %s, errno %d", d->name, error);
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g_topology_unlock();
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continue;
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}
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g_topology_unlock();
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error = gv_write_header(cp, vhdr);
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if (error) {
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G_VINUM_DEBUG(0, "writing vhdr failed on drive %s, "
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"errno %d", d->name, error);
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g_topology_lock();
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g_access(cp, 0, -1, 0);
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g_topology_unlock();
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continue;
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}
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/* First config copy. */
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error = g_write_data(cp, GV_CFG_OFFSET, sbuf_data(sb),
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GV_CFG_LEN);
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if (error) {
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G_VINUM_DEBUG(0, "writing first config copy failed on "
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"drive %s, errno %d", d->name, error);
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g_topology_lock();
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g_access(cp, 0, -1, 0);
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g_topology_unlock();
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continue;
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}
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/* Second config copy. */
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error = g_write_data(cp, GV_CFG_OFFSET + GV_CFG_LEN,
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sbuf_data(sb), GV_CFG_LEN);
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if (error)
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G_VINUM_DEBUG(0, "writing second config copy failed on "
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"drive %s, errno %d", d->name, error);
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g_topology_lock();
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g_access(cp, 0, -1, 0);
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g_topology_unlock();
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}
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sbuf_delete(sb);
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g_free(vhdr);
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}
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