| Current Path : /sys/geom/linux_lvm/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
| Current File : //sys/geom/linux_lvm/g_linux_lvm.c |
/*-
* Copyright (c) 2008 Andrew Thompson <thompsa@FreeBSD.org>
* 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 AUTHORS 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 AUTHORS 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: release/9.1.0/sys/geom/linux_lvm/g_linux_lvm.c 219029 2011-02-25 10:24:35Z netchild $");
#include <sys/ctype.h>
#include <sys/param.h>
#include <sys/bio.h>
#include <sys/kernel.h>
#include <sys/limits.h>
#include <sys/malloc.h>
#include <sys/queue.h>
#include <sys/sysctl.h>
#include <sys/systm.h>
#include <geom/geom.h>
#include <sys/endian.h>
#include <geom/linux_lvm/g_linux_lvm.h>
FEATURE(geom_linux_lvm, "GEOM Linux LVM partitioning support");
/* Declare malloc(9) label */
static MALLOC_DEFINE(M_GLLVM, "gllvm", "GEOM_LINUX_LVM Data");
/* GEOM class methods */
static g_access_t g_llvm_access;
static g_init_t g_llvm_init;
static g_orphan_t g_llvm_orphan;
static g_orphan_t g_llvm_taste_orphan;
static g_start_t g_llvm_start;
static g_taste_t g_llvm_taste;
static g_ctl_destroy_geom_t g_llvm_destroy_geom;
static void g_llvm_done(struct bio *);
static void g_llvm_remove_disk(struct g_llvm_vg *, struct g_consumer *);
static int g_llvm_activate_lv(struct g_llvm_vg *, struct g_llvm_lv *);
static int g_llvm_add_disk(struct g_llvm_vg *, struct g_provider *, char *);
static void g_llvm_free_vg(struct g_llvm_vg *);
static int g_llvm_destroy(struct g_llvm_vg *, int);
static int g_llvm_read_label(struct g_consumer *, struct g_llvm_label *);
static int g_llvm_read_md(struct g_consumer *, struct g_llvm_metadata *,
struct g_llvm_label *);
static int llvm_label_decode(const u_char *, struct g_llvm_label *, int);
static int llvm_md_decode(const u_char *, struct g_llvm_metadata *,
struct g_llvm_label *);
static int llvm_textconf_decode(u_char *, int,
struct g_llvm_metadata *);
static int llvm_textconf_decode_pv(char **, char *, struct g_llvm_vg *);
static int llvm_textconf_decode_lv(char **, char *, struct g_llvm_vg *);
static int llvm_textconf_decode_sg(char **, char *, struct g_llvm_lv *);
SYSCTL_DECL(_kern_geom);
SYSCTL_NODE(_kern_geom, OID_AUTO, linux_lvm, CTLFLAG_RW, 0,
"GEOM_LINUX_LVM stuff");
static u_int g_llvm_debug = 0;
TUNABLE_INT("kern.geom.linux_lvm.debug", &g_llvm_debug);
SYSCTL_UINT(_kern_geom_linux_lvm, OID_AUTO, debug, CTLFLAG_RW, &g_llvm_debug, 0,
"Debug level");
LIST_HEAD(, g_llvm_vg) vg_list;
/*
* Called to notify geom when it's been opened, and for what intent
*/
static int
g_llvm_access(struct g_provider *pp, int dr, int dw, int de)
{
struct g_consumer *c;
struct g_llvm_vg *vg;
struct g_geom *gp;
int error;
KASSERT(pp != NULL, ("%s: NULL provider", __func__));
gp = pp->geom;
KASSERT(gp != NULL, ("%s: NULL geom", __func__));
vg = gp->softc;
if (vg == NULL) {
/* It seems that .access can be called with negative dr,dw,dx
* in this case but I want to check for myself */
G_LLVM_DEBUG(0, "access(%d, %d, %d) for %s",
dr, dw, de, pp->name);
/* This should only happen when geom is withered so
* allow only negative requests */
KASSERT(dr <= 0 && dw <= 0 && de <= 0,
("%s: Positive access for %s", __func__, pp->name));
if (pp->acr + dr == 0 && pp->acw + dw == 0 && pp->ace + de == 0)
G_LLVM_DEBUG(0,
"Device %s definitely destroyed", pp->name);
return (0);
}
/* Grab an exclusive bit to propagate on our consumers on first open */
if (pp->acr == 0 && pp->acw == 0 && pp->ace == 0)
de++;
/* ... drop it on close */
if (pp->acr + dr == 0 && pp->acw + dw == 0 && pp->ace + de == 0)
de--;
error = ENXIO;
LIST_FOREACH(c, &gp->consumer, consumer) {
KASSERT(c != NULL, ("%s: consumer is NULL", __func__));
error = g_access(c, dr, dw, de);
if (error != 0) {
struct g_consumer *c2;
/* Backout earlier changes */
LIST_FOREACH(c2, &gp->consumer, consumer) {
if (c2 == c) /* all eariler components fixed */
return (error);
g_access(c2, -dr, -dw, -de);
}
}
}
return (error);
}
/*
* Dismantle bio_queue and destroy its components
*/
static void
bioq_dismantle(struct bio_queue_head *bq)
{
struct bio *b;
for (b = bioq_first(bq); b != NULL; b = bioq_first(bq)) {
bioq_remove(bq, b);
g_destroy_bio(b);
}
}
/*
* GEOM .done handler
* Can't use standard handler because one requested IO may
* fork into additional data IOs
*/
static void
g_llvm_done(struct bio *b)
{
struct bio *parent_b;
parent_b = b->bio_parent;
if (b->bio_error != 0) {
G_LLVM_DEBUG(0, "Error %d for offset=%ju, length=%ju on %s",
b->bio_error, b->bio_offset, b->bio_length,
b->bio_to->name);
if (parent_b->bio_error == 0)
parent_b->bio_error = b->bio_error;
}
parent_b->bio_inbed++;
parent_b->bio_completed += b->bio_completed;
if (parent_b->bio_children == parent_b->bio_inbed) {
parent_b->bio_completed = parent_b->bio_length;
g_io_deliver(parent_b, parent_b->bio_error);
}
g_destroy_bio(b);
}
static void
g_llvm_start(struct bio *bp)
{
struct g_provider *pp;
struct g_llvm_vg *vg;
struct g_llvm_pv *pv;
struct g_llvm_lv *lv;
struct g_llvm_segment *sg;
struct bio *cb;
struct bio_queue_head bq;
size_t chunk_size;
off_t offset, length;
char *addr;
u_int count;
pp = bp->bio_to;
lv = pp->private;
vg = pp->geom->softc;
switch (bp->bio_cmd) {
case BIO_READ:
case BIO_WRITE:
case BIO_DELETE:
/* XXX BIO_GETATTR allowed? */
break;
default:
g_io_deliver(bp, EOPNOTSUPP);
return;
}
bioq_init(&bq);
chunk_size = vg->vg_extentsize;
addr = bp->bio_data;
offset = bp->bio_offset; /* virtual offset and length */
length = bp->bio_length;
while (length > 0) {
size_t chunk_index, in_chunk_offset, in_chunk_length;
pv = NULL;
cb = g_clone_bio(bp);
if (cb == NULL) {
bioq_dismantle(&bq);
if (bp->bio_error == 0)
bp->bio_error = ENOMEM;
g_io_deliver(bp, bp->bio_error);
return;
}
/* get the segment and the pv */
if (lv->lv_sgcount == 1) {
/* skip much of the calculations for a single sg */
chunk_index = 0;
in_chunk_offset = 0;
in_chunk_length = length;
sg = lv->lv_firstsg;
pv = sg->sg_pv;
cb->bio_offset = offset + sg->sg_pvoffset;
} else {
chunk_index = offset / chunk_size; /* round downwards */
in_chunk_offset = offset % chunk_size;
in_chunk_length =
min(length, chunk_size - in_chunk_offset);
/* XXX could be faster */
LIST_FOREACH(sg, &lv->lv_segs, sg_next) {
if (chunk_index >= sg->sg_start &&
chunk_index <= sg->sg_end) {
/* adjust chunk index for sg start */
chunk_index -= sg->sg_start;
pv = sg->sg_pv;
break;
}
}
cb->bio_offset =
(off_t)chunk_index * (off_t)chunk_size
+ in_chunk_offset + sg->sg_pvoffset;
}
KASSERT(pv != NULL, ("Can't find PV for chunk %zu",
chunk_index));
cb->bio_to = pv->pv_gprov;
cb->bio_done = g_llvm_done;
cb->bio_length = in_chunk_length;
cb->bio_data = addr;
cb->bio_caller1 = pv;
bioq_disksort(&bq, cb);
G_LLVM_DEBUG(5,
"Mapped %s(%ju, %ju) on %s to %zu(%zu,%zu) @ %s:%ju",
bp->bio_cmd == BIO_READ ? "R" : "W",
offset, length, lv->lv_name,
chunk_index, in_chunk_offset, in_chunk_length,
pv->pv_name, cb->bio_offset);
addr += in_chunk_length;
length -= in_chunk_length;
offset += in_chunk_length;
}
/* Fire off bio's here */
count = 0;
for (cb = bioq_first(&bq); cb != NULL; cb = bioq_first(&bq)) {
bioq_remove(&bq, cb);
pv = cb->bio_caller1;
cb->bio_caller1 = NULL;
G_LLVM_DEBUG(6, "firing bio to %s, offset=%ju, length=%ju",
cb->bio_to->name, cb->bio_offset, cb->bio_length);
g_io_request(cb, pv->pv_gcons);
count++;
}
if (count == 0) { /* We handled everything locally */
bp->bio_completed = bp->bio_length;
g_io_deliver(bp, 0);
}
}
static void
g_llvm_remove_disk(struct g_llvm_vg *vg, struct g_consumer *cp)
{
struct g_llvm_pv *pv;
struct g_llvm_lv *lv;
struct g_llvm_segment *sg;
int found;
KASSERT(cp != NULL, ("Non-valid disk in %s.", __func__));
pv = (struct g_llvm_pv *)cp->private;
G_LLVM_DEBUG(0, "Disk %s removed from %s.", cp->provider->name,
pv->pv_name);
LIST_FOREACH(lv, &vg->vg_lvs, lv_next) {
/* Find segments that map to this disk */
found = 0;
LIST_FOREACH(sg, &lv->lv_segs, sg_next) {
if (sg->sg_pv == pv) {
sg->sg_pv = NULL;
lv->lv_sgactive--;
found = 1;
break;
}
}
if (found) {
G_LLVM_DEBUG(0, "Device %s removed.",
lv->lv_gprov->name);
g_orphan_provider(lv->lv_gprov, ENXIO);
lv->lv_gprov = NULL;
}
}
if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0)
g_access(cp, -cp->acr, -cp->acw, -cp->ace);
g_detach(cp);
g_destroy_consumer(cp);
}
static void
g_llvm_orphan(struct g_consumer *cp)
{
struct g_llvm_vg *vg;
struct g_geom *gp;
g_topology_assert();
gp = cp->geom;
vg = gp->softc;
if (vg == NULL)
return;
g_llvm_remove_disk(vg, cp);
g_llvm_destroy(vg, 1);
}
static int
g_llvm_activate_lv(struct g_llvm_vg *vg, struct g_llvm_lv *lv)
{
struct g_geom *gp;
struct g_provider *pp;
g_topology_assert();
KASSERT(lv->lv_sgactive == lv->lv_sgcount, ("segment missing"));
gp = vg->vg_geom;
pp = g_new_providerf(gp, "linux_lvm/%s-%s", vg->vg_name, lv->lv_name);
pp->mediasize = vg->vg_extentsize * (off_t)lv->lv_extentcount;
pp->sectorsize = vg->vg_sectorsize;
g_error_provider(pp, 0);
lv->lv_gprov = pp;
pp->private = lv;
G_LLVM_DEBUG(1, "Created %s, %juM", pp->name,
pp->mediasize / (1024*1024));
return (0);
}
static int
g_llvm_add_disk(struct g_llvm_vg *vg, struct g_provider *pp, char *uuid)
{
struct g_geom *gp;
struct g_consumer *cp, *fcp;
struct g_llvm_pv *pv;
struct g_llvm_lv *lv;
struct g_llvm_segment *sg;
int error;
g_topology_assert();
LIST_FOREACH(pv, &vg->vg_pvs, pv_next) {
if (strcmp(pv->pv_uuid, uuid) == 0)
break; /* found it */
}
if (pv == NULL) {
G_LLVM_DEBUG(3, "uuid %s not found in pv list", uuid);
return (ENOENT);
}
if (pv->pv_gprov != NULL) {
G_LLVM_DEBUG(0, "disk %s already initialised in %s",
pv->pv_name, vg->vg_name);
return (EEXIST);
}
pv->pv_start *= vg->vg_sectorsize;
gp = vg->vg_geom;
fcp = LIST_FIRST(&gp->consumer);
cp = g_new_consumer(gp);
error = g_attach(cp, pp);
G_LLVM_DEBUG(1, "Attached %s to %s at offset %ju",
pp->name, pv->pv_name, pv->pv_start);
if (error != 0) {
G_LLVM_DEBUG(0, "cannot attach %s to %s",
pp->name, vg->vg_name);
g_destroy_consumer(cp);
return (error);
}
if (fcp != NULL) {
if (fcp->provider->sectorsize != pp->sectorsize) {
G_LLVM_DEBUG(0, "Provider %s of %s has invalid "
"sector size (%d)", pp->name, vg->vg_name,
pp->sectorsize);
return (EINVAL);
}
if (fcp->acr > 0 || fcp->acw || fcp->ace > 0) {
/* Replicate access permissions from first "live"
* consumer to the new one */
error = g_access(cp, fcp->acr, fcp->acw, fcp->ace);
if (error != 0) {
g_detach(cp);
g_destroy_consumer(cp);
return (error);
}
}
}
cp->private = pv;
pv->pv_gcons = cp;
pv->pv_gprov = pp;
LIST_FOREACH(lv, &vg->vg_lvs, lv_next) {
/* Find segments that map to this disk */
LIST_FOREACH(sg, &lv->lv_segs, sg_next) {
if (strcmp(sg->sg_pvname, pv->pv_name) == 0) {
/* avtivate the segment */
KASSERT(sg->sg_pv == NULL,
("segment already mapped"));
sg->sg_pvoffset =
(off_t)sg->sg_pvstart * vg->vg_extentsize
+ pv->pv_start;
sg->sg_pv = pv;
lv->lv_sgactive++;
G_LLVM_DEBUG(2, "%s: %d to %d @ %s:%d"
" offset %ju sector %ju",
lv->lv_name, sg->sg_start, sg->sg_end,
sg->sg_pvname, sg->sg_pvstart,
sg->sg_pvoffset,
sg->sg_pvoffset / vg->vg_sectorsize);
}
}
/* Activate any lvs waiting on this disk */
if (lv->lv_gprov == NULL && lv->lv_sgactive == lv->lv_sgcount) {
error = g_llvm_activate_lv(vg, lv);
if (error)
break;
}
}
return (error);
}
static void
g_llvm_init(struct g_class *mp)
{
LIST_INIT(&vg_list);
}
static void
g_llvm_free_vg(struct g_llvm_vg *vg)
{
struct g_llvm_pv *pv;
struct g_llvm_lv *lv;
struct g_llvm_segment *sg;
/* Free all the structures */
while ((pv = LIST_FIRST(&vg->vg_pvs)) != NULL) {
LIST_REMOVE(pv, pv_next);
free(pv, M_GLLVM);
}
while ((lv = LIST_FIRST(&vg->vg_lvs)) != NULL) {
while ((sg = LIST_FIRST(&lv->lv_segs)) != NULL) {
LIST_REMOVE(sg, sg_next);
free(sg, M_GLLVM);
}
LIST_REMOVE(lv, lv_next);
free(lv, M_GLLVM);
}
LIST_REMOVE(vg, vg_next);
free(vg, M_GLLVM);
}
static void
g_llvm_taste_orphan(struct g_consumer *cp)
{
KASSERT(1 == 0, ("%s called while tasting %s.", __func__,
cp->provider->name));
}
static struct g_geom *
g_llvm_taste(struct g_class *mp, struct g_provider *pp, int flags __unused)
{
struct g_consumer *cp;
struct g_geom *gp;
struct g_llvm_label ll;
struct g_llvm_metadata md;
struct g_llvm_vg *vg;
int error;
bzero(&md, sizeof(md));
g_topology_assert();
g_trace(G_T_TOPOLOGY, "%s(%s, %s)", __func__, mp->name, pp->name);
gp = g_new_geomf(mp, "linux_lvm:taste");
/* This orphan function should be never called. */
gp->orphan = g_llvm_taste_orphan;
cp = g_new_consumer(gp);
g_attach(cp, pp);
error = g_llvm_read_label(cp, &ll);
if (!error)
error = g_llvm_read_md(cp, &md, &ll);
g_detach(cp);
g_destroy_consumer(cp);
g_destroy_geom(gp);
if (error != 0)
return (NULL);
vg = md.md_vg;
if (vg->vg_geom == NULL) {
/* new volume group */
gp = g_new_geomf(mp, "%s", vg->vg_name);
gp->start = g_llvm_start;
gp->spoiled = g_llvm_orphan;
gp->orphan = g_llvm_orphan;
gp->access = g_llvm_access;
vg->vg_sectorsize = pp->sectorsize;
vg->vg_extentsize *= vg->vg_sectorsize;
vg->vg_geom = gp;
gp->softc = vg;
G_LLVM_DEBUG(1, "Created volume %s, extent size %zuK",
vg->vg_name, vg->vg_extentsize / 1024);
}
/* initialise this disk in the volume group */
g_llvm_add_disk(vg, pp, ll.ll_uuid);
return (vg->vg_geom);
}
static int
g_llvm_destroy(struct g_llvm_vg *vg, int force)
{
struct g_provider *pp;
struct g_geom *gp;
g_topology_assert();
if (vg == NULL)
return (ENXIO);
gp = vg->vg_geom;
LIST_FOREACH(pp, &gp->provider, provider) {
if (pp->acr != 0 || pp->acw != 0 || pp->ace != 0) {
G_LLVM_DEBUG(1, "Device %s is still open (r%dw%de%d)",
pp->name, pp->acr, pp->acw, pp->ace);
if (!force)
return (EBUSY);
}
}
g_llvm_free_vg(gp->softc);
gp->softc = NULL;
g_wither_geom(gp, ENXIO);
return (0);
}
static int
g_llvm_destroy_geom(struct gctl_req *req __unused, struct g_class *mp __unused,
struct g_geom *gp)
{
struct g_llvm_vg *vg;
vg = gp->softc;
return (g_llvm_destroy(vg, 0));
}
int
g_llvm_read_label(struct g_consumer *cp, struct g_llvm_label *ll)
{
struct g_provider *pp;
u_char *buf;
int i, error = 0;
g_topology_assert();
/* The LVM label is stored on the first four sectors */
error = g_access(cp, 1, 0, 0);
if (error != 0)
return (error);
pp = cp->provider;
g_topology_unlock();
buf = g_read_data(cp, 0, pp->sectorsize * 4, &error);
g_topology_lock();
g_access(cp, -1, 0, 0);
if (buf == NULL) {
G_LLVM_DEBUG(1, "Cannot read metadata from %s (error=%d)",
pp->name, error);
return (error);
}
/* Search the four sectors for the LVM label. */
for (i = 0; i < 4; i++) {
error = llvm_label_decode(&buf[i * pp->sectorsize], ll, i);
if (error == 0)
break; /* found it */
}
g_free(buf);
return (error);
}
int
g_llvm_read_md(struct g_consumer *cp, struct g_llvm_metadata *md,
struct g_llvm_label *ll)
{
struct g_provider *pp;
u_char *buf;
int error;
int size;
g_topology_assert();
error = g_access(cp, 1, 0, 0);
if (error != 0)
return (error);
pp = cp->provider;
g_topology_unlock();
buf = g_read_data(cp, ll->ll_md_offset, pp->sectorsize, &error);
g_topology_lock();
g_access(cp, -1, 0, 0);
if (buf == NULL) {
G_LLVM_DEBUG(0, "Cannot read metadata from %s (error=%d)",
cp->provider->name, error);
return (error);
}
error = llvm_md_decode(buf, md, ll);
g_free(buf);
if (error != 0) {
return (error);
}
G_LLVM_DEBUG(1, "reading LVM2 config @ %s:%ju", pp->name,
ll->ll_md_offset + md->md_reloffset);
error = g_access(cp, 1, 0, 0);
if (error != 0)
return (error);
pp = cp->provider;
g_topology_unlock();
/* round up to the nearest sector */
size = md->md_relsize +
(pp->sectorsize - md->md_relsize % pp->sectorsize);
buf = g_read_data(cp, ll->ll_md_offset + md->md_reloffset, size, &error);
g_topology_lock();
g_access(cp, -1, 0, 0);
if (buf == NULL) {
G_LLVM_DEBUG(0, "Cannot read LVM2 config from %s (error=%d)",
pp->name, error);
return (error);
}
buf[md->md_relsize] = '\0';
G_LLVM_DEBUG(10, "LVM config:\n%s\n", buf);
error = llvm_textconf_decode(buf, md->md_relsize, md);
g_free(buf);
return (error);
}
static int
llvm_label_decode(const u_char *data, struct g_llvm_label *ll, int sector)
{
uint64_t off;
char *uuid;
/* Magic string */
if (bcmp("LABELONE", data , 8) != 0)
return (EINVAL);
/* We only support LVM2 text format */
if (bcmp("LVM2 001", data + 24, 8) != 0) {
G_LLVM_DEBUG(0, "Unsupported LVM format");
return (EINVAL);
}
ll->ll_sector = le64dec(data + 8);
ll->ll_crc = le32dec(data + 16);
ll->ll_offset = le32dec(data + 20);
if (ll->ll_sector != sector) {
G_LLVM_DEBUG(0, "Expected sector %ju, found at %d",
ll->ll_sector, sector);
return (EINVAL);
}
off = ll->ll_offset;
/*
* convert the binary uuid to string format, the format is
* xxxxxx-xxxx-xxxx-xxxx-xxxx-xxxx-xxxxxx (6-4-4-4-4-4-6)
*/
uuid = ll->ll_uuid;
bcopy(data + off, uuid, 6);
off += 6;
uuid += 6;
*uuid++ = '-';
for (int i = 0; i < 5; i++) {
bcopy(data + off, uuid, 4);
off += 4;
uuid += 4;
*uuid++ = '-';
}
bcopy(data + off, uuid, 6);
off += 6;
uuid += 6;
*uuid++ = '\0';
ll->ll_size = le64dec(data + off);
off += 8;
ll->ll_pestart = le64dec(data + off);
off += 16;
/* Only one data section is supported */
if (le64dec(data + off) != 0) {
G_LLVM_DEBUG(0, "Only one data section supported");
return (EINVAL);
}
off += 16;
ll->ll_md_offset = le64dec(data + off);
off += 8;
ll->ll_md_size = le64dec(data + off);
off += 8;
G_LLVM_DEBUG(1, "LVM metadata: offset=%ju, size=%ju", ll->ll_md_offset,
ll->ll_md_size);
/* Only one data section is supported */
if (le64dec(data + off) != 0) {
G_LLVM_DEBUG(0, "Only one metadata section supported");
return (EINVAL);
}
G_LLVM_DEBUG(2, "label uuid=%s", ll->ll_uuid);
G_LLVM_DEBUG(2, "sector=%ju, crc=%u, offset=%u, size=%ju, pestart=%ju",
ll->ll_sector, ll->ll_crc, ll->ll_offset, ll->ll_size,
ll->ll_pestart);
return (0);
}
static int
llvm_md_decode(const u_char *data, struct g_llvm_metadata *md,
struct g_llvm_label *ll)
{
uint64_t off;
char magic[16];
off = 0;
md->md_csum = le32dec(data + off);
off += 4;
bcopy(data + off, magic, 16);
off += 16;
md->md_version = le32dec(data + off);
off += 4;
md->md_start = le64dec(data + off);
off += 8;
md->md_size = le64dec(data + off);
off += 8;
if (bcmp(G_LLVM_MAGIC, magic, 16) != 0) {
G_LLVM_DEBUG(0, "Incorrect md magic number");
return (EINVAL);
}
if (md->md_version != 1) {
G_LLVM_DEBUG(0, "Incorrect md version number (%u)",
md->md_version);
return (EINVAL);
}
if (md->md_start != ll->ll_md_offset) {
G_LLVM_DEBUG(0, "Incorrect md offset (%ju)", md->md_start);
return (EINVAL);
}
/* Aparently only one is ever returned */
md->md_reloffset = le64dec(data + off);
off += 8;
md->md_relsize = le64dec(data + off);
off += 16; /* XXX skipped checksum */
if (le64dec(data + off) != 0) {
G_LLVM_DEBUG(0, "Only one reloc supported");
return (EINVAL);
}
G_LLVM_DEBUG(3, "reloc: offset=%ju, size=%ju",
md->md_reloffset, md->md_relsize);
G_LLVM_DEBUG(3, "md: version=%u, start=%ju, size=%ju",
md->md_version, md->md_start, md->md_size);
return (0);
}
#define GRAB_INT(key, tok1, tok2, v) \
if (tok1 && tok2 && strncmp(tok1, key, sizeof(key)) == 0) { \
v = strtol(tok2, &tok1, 10); \
if (tok1 == tok2) \
/* strtol did not eat any of the buffer */ \
goto bad; \
continue; \
}
#define GRAB_STR(key, tok1, tok2, v, len) \
if (tok1 && tok2 && strncmp(tok1, key, sizeof(key)) == 0) { \
strsep(&tok2, "\""); \
if (tok2 == NULL) \
continue; \
tok1 = strsep(&tok2, "\""); \
if (tok2 == NULL) \
continue; \
strncpy(v, tok1, len); \
continue; \
}
#define SPLIT(key, value, str) \
key = strsep(&value, str); \
/* strip trailing whitespace on the key */ \
for (char *t = key; *t != '\0'; t++) \
if (isspace(*t)) { \
*t = '\0'; \
break; \
}
static size_t
llvm_grab_name(char *name, const char *tok)
{
size_t len;
len = 0;
if (tok == NULL)
return (0);
if (tok[0] == '-')
return (0);
if (strcmp(tok, ".") == 0 || strcmp(tok, "..") == 0)
return (0);
while (tok[len] && (isalpha(tok[len]) || isdigit(tok[len]) ||
tok[len] == '.' || tok[len] == '_' || tok[len] == '-' ||
tok[len] == '+') && len < G_LLVM_NAMELEN - 1)
len++;
bcopy(tok, name, len);
name[len] = '\0';
return (len);
}
static int
llvm_textconf_decode(u_char *data, int buflen, struct g_llvm_metadata *md)
{
struct g_llvm_vg *vg;
char *buf = data;
char *tok, *v;
char name[G_LLVM_NAMELEN];
char uuid[G_LLVM_UUIDLEN];
size_t len;
if (buf == NULL || *buf == '\0')
return (EINVAL);
tok = strsep(&buf, "\n");
if (tok == NULL)
return (EINVAL);
len = llvm_grab_name(name, tok);
if (len == 0)
return (EINVAL);
/* check too see if the vg has already been loaded off another disk */
LIST_FOREACH(vg, &vg_list, vg_next) {
if (strcmp(vg->vg_name, name) == 0) {
uuid[0] = '\0';
/* grab the volume group uuid */
while ((tok = strsep(&buf, "\n")) != NULL) {
if (strstr(tok, "{"))
break;
if (strstr(tok, "=")) {
SPLIT(v, tok, "=");
GRAB_STR("id", v, tok, uuid,
sizeof(uuid));
}
}
if (strcmp(vg->vg_uuid, uuid) == 0) {
/* existing vg */
md->md_vg = vg;
return (0);
}
/* XXX different volume group with name clash! */
G_LLVM_DEBUG(0,
"%s already exists, volume group not loaded", name);
return (EINVAL);
}
}
vg = malloc(sizeof(*vg), M_GLLVM, M_NOWAIT|M_ZERO);
if (vg == NULL)
return (ENOMEM);
strncpy(vg->vg_name, name, sizeof(vg->vg_name));
LIST_INIT(&vg->vg_pvs);
LIST_INIT(&vg->vg_lvs);
#define VOL_FOREACH(func, tok, buf, p) \
while ((tok = strsep(buf, "\n")) != NULL) { \
if (strstr(tok, "{")) { \
func(buf, tok, p); \
continue; \
} \
if (strstr(tok, "}")) \
break; \
}
while ((tok = strsep(&buf, "\n")) != NULL) {
if (strcmp(tok, "physical_volumes {") == 0) {
VOL_FOREACH(llvm_textconf_decode_pv, tok, &buf, vg);
continue;
}
if (strcmp(tok, "logical_volumes {") == 0) {
VOL_FOREACH(llvm_textconf_decode_lv, tok, &buf, vg);
continue;
}
if (strstr(tok, "{")) {
G_LLVM_DEBUG(2, "unknown section %s", tok);
continue;
}
/* parse 'key = value' lines */
if (strstr(tok, "=")) {
SPLIT(v, tok, "=");
GRAB_STR("id", v, tok, vg->vg_uuid, sizeof(vg->vg_uuid));
GRAB_INT("extent_size", v, tok, vg->vg_extentsize);
continue;
}
}
/* basic checking */
if (vg->vg_extentsize == 0)
goto bad;
md->md_vg = vg;
LIST_INSERT_HEAD(&vg_list, vg, vg_next);
G_LLVM_DEBUG(3, "vg: name=%s uuid=%s", vg->vg_name, vg->vg_uuid);
return(0);
bad:
g_llvm_free_vg(vg);
return (-1);
}
#undef VOL_FOREACH
static int
llvm_textconf_decode_pv(char **buf, char *tok, struct g_llvm_vg *vg)
{
struct g_llvm_pv *pv;
char *v;
size_t len;
if (*buf == NULL || **buf == '\0')
return (EINVAL);
pv = malloc(sizeof(*pv), M_GLLVM, M_NOWAIT|M_ZERO);
if (pv == NULL)
return (ENOMEM);
pv->pv_vg = vg;
len = 0;
if (tok == NULL)
goto bad;
len = llvm_grab_name(pv->pv_name, tok);
if (len == 0)
goto bad;
while ((tok = strsep(buf, "\n")) != NULL) {
if (strstr(tok, "{"))
goto bad;
if (strstr(tok, "}"))
break;
/* parse 'key = value' lines */
if (strstr(tok, "=")) {
SPLIT(v, tok, "=");
GRAB_STR("id", v, tok, pv->pv_uuid, sizeof(pv->pv_uuid));
GRAB_INT("pe_start", v, tok, pv->pv_start);
GRAB_INT("pe_count", v, tok, pv->pv_count);
continue;
}
}
if (tok == NULL)
goto bad;
/* basic checking */
if (pv->pv_count == 0)
goto bad;
LIST_INSERT_HEAD(&vg->vg_pvs, pv, pv_next);
G_LLVM_DEBUG(3, "pv: name=%s uuid=%s", pv->pv_name, pv->pv_uuid);
return (0);
bad:
free(pv, M_GLLVM);
return (-1);
}
static int
llvm_textconf_decode_lv(char **buf, char *tok, struct g_llvm_vg *vg)
{
struct g_llvm_lv *lv;
struct g_llvm_segment *sg;
char *v;
size_t len;
if (*buf == NULL || **buf == '\0')
return (EINVAL);
lv = malloc(sizeof(*lv), M_GLLVM, M_NOWAIT|M_ZERO);
if (lv == NULL)
return (ENOMEM);
lv->lv_vg = vg;
LIST_INIT(&lv->lv_segs);
if (tok == NULL)
goto bad;
len = llvm_grab_name(lv->lv_name, tok);
if (len == 0)
goto bad;
while ((tok = strsep(buf, "\n")) != NULL) {
if (strstr(tok, "{")) {
if (strstr(tok, "segment")) {
llvm_textconf_decode_sg(buf, tok, lv);
continue;
} else
/* unexpected section */
goto bad;
}
if (strstr(tok, "}"))
break;
/* parse 'key = value' lines */
if (strstr(tok, "=")) {
SPLIT(v, tok, "=");
GRAB_STR("id", v, tok, lv->lv_uuid, sizeof(lv->lv_uuid));
GRAB_INT("segment_count", v, tok, lv->lv_sgcount);
continue;
}
}
if (tok == NULL)
goto bad;
if (lv->lv_sgcount == 0 || lv->lv_sgcount != lv->lv_numsegs)
/* zero or incomplete segment list */
goto bad;
/* Optimize for only one segment on the pv */
lv->lv_firstsg = LIST_FIRST(&lv->lv_segs);
LIST_INSERT_HEAD(&vg->vg_lvs, lv, lv_next);
G_LLVM_DEBUG(3, "lv: name=%s uuid=%s", lv->lv_name, lv->lv_uuid);
return (0);
bad:
while ((sg = LIST_FIRST(&lv->lv_segs)) != NULL) {
LIST_REMOVE(sg, sg_next);
free(sg, M_GLLVM);
}
free(lv, M_GLLVM);
return (-1);
}
static int
llvm_textconf_decode_sg(char **buf, char *tok, struct g_llvm_lv *lv)
{
struct g_llvm_segment *sg;
char *v;
int count = 0;
if (*buf == NULL || **buf == '\0')
return (EINVAL);
sg = malloc(sizeof(*sg), M_GLLVM, M_NOWAIT|M_ZERO);
if (sg == NULL)
return (ENOMEM);
while ((tok = strsep(buf, "\n")) != NULL) {
/* only a single linear stripe is supported */
if (strstr(tok, "stripe_count")) {
SPLIT(v, tok, "=");
GRAB_INT("stripe_count", v, tok, count);
if (count != 1)
goto bad;
}
if (strstr(tok, "{"))
goto bad;
if (strstr(tok, "}"))
break;
if (strcmp(tok, "stripes = [") == 0) {
tok = strsep(buf, "\n");
if (tok == NULL)
goto bad;
strsep(&tok, "\"");
if (tok == NULL)
goto bad; /* missing open quotes */
v = strsep(&tok, "\"");
if (tok == NULL)
goto bad; /* missing close quotes */
strncpy(sg->sg_pvname, v, sizeof(sg->sg_pvname));
if (*tok != ',')
goto bad; /* missing comma for stripe */
tok++;
sg->sg_pvstart = strtol(tok, &v, 10);
if (v == tok)
/* strtol did not eat any of the buffer */
goto bad;
continue;
}
/* parse 'key = value' lines */
if (strstr(tok, "=")) {
SPLIT(v, tok, "=");
GRAB_INT("start_extent", v, tok, sg->sg_start);
GRAB_INT("extent_count", v, tok, sg->sg_count);
continue;
}
}
if (tok == NULL)
goto bad;
/* basic checking */
if (count != 1 || sg->sg_count == 0)
goto bad;
sg->sg_end = sg->sg_start + sg->sg_count - 1;
lv->lv_numsegs++;
lv->lv_extentcount += sg->sg_count;
LIST_INSERT_HEAD(&lv->lv_segs, sg, sg_next);
return (0);
bad:
free(sg, M_GLLVM);
return (-1);
}
#undef GRAB_INT
#undef GRAB_STR
#undef SPLIT
static struct g_class g_llvm_class = {
.name = G_LLVM_CLASS_NAME,
.version = G_VERSION,
.init = g_llvm_init,
.taste = g_llvm_taste,
.destroy_geom = g_llvm_destroy_geom
};
DECLARE_GEOM_CLASS(g_llvm_class, g_linux_lvm);