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freebsd-skq/sys/geom/journal/g_journal.c
mckusick 9e57d147a9 Null out journal softc pointer earlier to avoid a segment fault 
that can otherwise occur.

PR:           221804
Submitted by: Andreas Longwitz <longwitz at incore.de>
MFC after:    1 week
2018-01-31 23:30:49 +00:00

3014 lines
79 KiB
C
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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2005-2006 Pawel Jakub Dawidek <pjd@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("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/limits.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/bio.h>
#include <sys/sysctl.h>
#include <sys/malloc.h>
#include <sys/mount.h>
#include <sys/eventhandler.h>
#include <sys/proc.h>
#include <sys/kthread.h>
#include <sys/sched.h>
#include <sys/taskqueue.h>
#include <sys/vnode.h>
#include <sys/sbuf.h>
#ifdef GJ_MEMDEBUG
#include <sys/stack.h>
#include <sys/kdb.h>
#endif
#include <vm/vm.h>
#include <vm/vm_kern.h>
#include <geom/geom.h>
#include <geom/journal/g_journal.h>
FEATURE(geom_journal, "GEOM journaling support");
/*
* On-disk journal format:
*
* JH - Journal header
* RH - Record header
*
* %%%%%% ****** +------+ +------+ ****** +------+ %%%%%%
* % JH % * RH * | Data | | Data | ... * RH * | Data | ... % JH % ...
* %%%%%% ****** +------+ +------+ ****** +------+ %%%%%%
*
*/
CTASSERT(sizeof(struct g_journal_header) <= 512);
CTASSERT(sizeof(struct g_journal_record_header) <= 512);
static MALLOC_DEFINE(M_JOURNAL, "journal_data", "GEOM_JOURNAL Data");
static struct mtx g_journal_cache_mtx;
MTX_SYSINIT(g_journal_cache, &g_journal_cache_mtx, "cache usage", MTX_DEF);
const struct g_journal_desc *g_journal_filesystems[] = {
&g_journal_ufs,
NULL
};
SYSCTL_DECL(_kern_geom);
int g_journal_debug = 0;
static u_int g_journal_switch_time = 10;
static u_int g_journal_force_switch = 70;
static u_int g_journal_parallel_flushes = 16;
static u_int g_journal_parallel_copies = 16;
static u_int g_journal_accept_immediately = 64;
static u_int g_journal_record_entries = GJ_RECORD_HEADER_NENTRIES;
static u_int g_journal_do_optimize = 1;
static SYSCTL_NODE(_kern_geom, OID_AUTO, journal, CTLFLAG_RW, 0,
"GEOM_JOURNAL stuff");
SYSCTL_INT(_kern_geom_journal, OID_AUTO, debug, CTLFLAG_RWTUN, &g_journal_debug, 0,
"Debug level");
SYSCTL_UINT(_kern_geom_journal, OID_AUTO, switch_time, CTLFLAG_RW,
&g_journal_switch_time, 0, "Switch journals every N seconds");
SYSCTL_UINT(_kern_geom_journal, OID_AUTO, force_switch, CTLFLAG_RW,
&g_journal_force_switch, 0, "Force switch when journal is N% full");
SYSCTL_UINT(_kern_geom_journal, OID_AUTO, parallel_flushes, CTLFLAG_RW,
&g_journal_parallel_flushes, 0,
"Number of flush I/O requests to send in parallel");
SYSCTL_UINT(_kern_geom_journal, OID_AUTO, accept_immediately, CTLFLAG_RW,
&g_journal_accept_immediately, 0,
"Number of I/O requests accepted immediately");
SYSCTL_UINT(_kern_geom_journal, OID_AUTO, parallel_copies, CTLFLAG_RW,
&g_journal_parallel_copies, 0,
"Number of copy I/O requests to send in parallel");
static int
g_journal_record_entries_sysctl(SYSCTL_HANDLER_ARGS)
{
u_int entries;
int error;
entries = g_journal_record_entries;
error = sysctl_handle_int(oidp, &entries, 0, req);
if (error != 0 || req->newptr == NULL)
return (error);
if (entries < 1 || entries > GJ_RECORD_HEADER_NENTRIES)
return (EINVAL);
g_journal_record_entries = entries;
return (0);
}
SYSCTL_PROC(_kern_geom_journal, OID_AUTO, record_entries,
CTLTYPE_UINT | CTLFLAG_RW, NULL, 0, g_journal_record_entries_sysctl, "I",
"Maximum number of entires in one journal record");
SYSCTL_UINT(_kern_geom_journal, OID_AUTO, optimize, CTLFLAG_RW,
&g_journal_do_optimize, 0, "Try to combine bios on flush and copy");
static u_long g_journal_cache_used = 0;
static u_long g_journal_cache_limit = 64 * 1024 * 1024;
static u_int g_journal_cache_divisor = 2;
static u_int g_journal_cache_switch = 90;
static u_int g_journal_cache_misses = 0;
static u_int g_journal_cache_alloc_failures = 0;
static u_long g_journal_cache_low = 0;
static SYSCTL_NODE(_kern_geom_journal, OID_AUTO, cache, CTLFLAG_RW, 0,
"GEOM_JOURNAL cache");
SYSCTL_ULONG(_kern_geom_journal_cache, OID_AUTO, used, CTLFLAG_RD,
&g_journal_cache_used, 0, "Number of allocated bytes");
static int
g_journal_cache_limit_sysctl(SYSCTL_HANDLER_ARGS)
{
u_long limit;
int error;
limit = g_journal_cache_limit;
error = sysctl_handle_long(oidp, &limit, 0, req);
if (error != 0 || req->newptr == NULL)
return (error);
g_journal_cache_limit = limit;
g_journal_cache_low = (limit / 100) * g_journal_cache_switch;
return (0);
}
SYSCTL_PROC(_kern_geom_journal_cache, OID_AUTO, limit,
CTLTYPE_ULONG | CTLFLAG_RWTUN, NULL, 0, g_journal_cache_limit_sysctl, "I",
"Maximum number of allocated bytes");
SYSCTL_UINT(_kern_geom_journal_cache, OID_AUTO, divisor, CTLFLAG_RDTUN,
&g_journal_cache_divisor, 0,
"(kmem_size / kern.geom.journal.cache.divisor) == cache size");
static int
g_journal_cache_switch_sysctl(SYSCTL_HANDLER_ARGS)
{
u_int cswitch;
int error;
cswitch = g_journal_cache_switch;
error = sysctl_handle_int(oidp, &cswitch, 0, req);
if (error != 0 || req->newptr == NULL)
return (error);
if (cswitch > 100)
return (EINVAL);
g_journal_cache_switch = cswitch;
g_journal_cache_low = (g_journal_cache_limit / 100) * cswitch;
return (0);
}
SYSCTL_PROC(_kern_geom_journal_cache, OID_AUTO, switch,
CTLTYPE_UINT | CTLFLAG_RW, NULL, 0, g_journal_cache_switch_sysctl, "I",
"Force switch when we hit this percent of cache use");
SYSCTL_UINT(_kern_geom_journal_cache, OID_AUTO, misses, CTLFLAG_RW,
&g_journal_cache_misses, 0, "Number of cache misses");
SYSCTL_UINT(_kern_geom_journal_cache, OID_AUTO, alloc_failures, CTLFLAG_RW,
&g_journal_cache_alloc_failures, 0, "Memory allocation failures");
static u_long g_journal_stats_bytes_skipped = 0;
static u_long g_journal_stats_combined_ios = 0;
static u_long g_journal_stats_switches = 0;
static u_long g_journal_stats_wait_for_copy = 0;
static u_long g_journal_stats_journal_full = 0;
static u_long g_journal_stats_low_mem = 0;
static SYSCTL_NODE(_kern_geom_journal, OID_AUTO, stats, CTLFLAG_RW, 0,
"GEOM_JOURNAL statistics");
SYSCTL_ULONG(_kern_geom_journal_stats, OID_AUTO, skipped_bytes, CTLFLAG_RW,
&g_journal_stats_bytes_skipped, 0, "Number of skipped bytes");
SYSCTL_ULONG(_kern_geom_journal_stats, OID_AUTO, combined_ios, CTLFLAG_RW,
&g_journal_stats_combined_ios, 0, "Number of combined I/O requests");
SYSCTL_ULONG(_kern_geom_journal_stats, OID_AUTO, switches, CTLFLAG_RW,
&g_journal_stats_switches, 0, "Number of journal switches");
SYSCTL_ULONG(_kern_geom_journal_stats, OID_AUTO, wait_for_copy, CTLFLAG_RW,
&g_journal_stats_wait_for_copy, 0, "Wait for journal copy on switch");
SYSCTL_ULONG(_kern_geom_journal_stats, OID_AUTO, journal_full, CTLFLAG_RW,
&g_journal_stats_journal_full, 0,
"Number of times journal was almost full.");
SYSCTL_ULONG(_kern_geom_journal_stats, OID_AUTO, low_mem, CTLFLAG_RW,
&g_journal_stats_low_mem, 0, "Number of times low_mem hook was called.");
static g_taste_t g_journal_taste;
static g_ctl_req_t g_journal_config;
static g_dumpconf_t g_journal_dumpconf;
static g_init_t g_journal_init;
static g_fini_t g_journal_fini;
struct g_class g_journal_class = {
.name = G_JOURNAL_CLASS_NAME,
.version = G_VERSION,
.taste = g_journal_taste,
.ctlreq = g_journal_config,
.dumpconf = g_journal_dumpconf,
.init = g_journal_init,
.fini = g_journal_fini
};
static int g_journal_destroy(struct g_journal_softc *sc);
static void g_journal_metadata_update(struct g_journal_softc *sc);
static void g_journal_start_switcher(struct g_class *mp);
static void g_journal_stop_switcher(void);
static void g_journal_switch_wait(struct g_journal_softc *sc);
#define GJ_SWITCHER_WORKING 0
#define GJ_SWITCHER_DIE 1
#define GJ_SWITCHER_DIED 2
static struct proc *g_journal_switcher_proc = NULL;
static int g_journal_switcher_state = GJ_SWITCHER_WORKING;
static int g_journal_switcher_wokenup = 0;
static int g_journal_sync_requested = 0;
#ifdef GJ_MEMDEBUG
struct meminfo {
size_t mi_size;
struct stack mi_stack;
};
#endif
/*
* We use our own malloc/realloc/free funtions, so we can collect statistics
* and force journal switch when we're running out of cache.
*/
static void *
gj_malloc(size_t size, int flags)
{
void *p;
#ifdef GJ_MEMDEBUG
struct meminfo *mi;
#endif
mtx_lock(&g_journal_cache_mtx);
if (g_journal_cache_limit > 0 && !g_journal_switcher_wokenup &&
g_journal_cache_used + size > g_journal_cache_low) {
GJ_DEBUG(1, "No cache, waking up the switcher.");
g_journal_switcher_wokenup = 1;
wakeup(&g_journal_switcher_state);
}
if ((flags & M_NOWAIT) && g_journal_cache_limit > 0 &&
g_journal_cache_used + size > g_journal_cache_limit) {
mtx_unlock(&g_journal_cache_mtx);
g_journal_cache_alloc_failures++;
return (NULL);
}
g_journal_cache_used += size;
mtx_unlock(&g_journal_cache_mtx);
flags &= ~M_NOWAIT;
#ifndef GJ_MEMDEBUG
p = malloc(size, M_JOURNAL, flags | M_WAITOK);
#else
mi = malloc(sizeof(*mi) + size, M_JOURNAL, flags | M_WAITOK);
p = (u_char *)mi + sizeof(*mi);
mi->mi_size = size;
stack_save(&mi->mi_stack);
#endif
return (p);
}
static void
gj_free(void *p, size_t size)
{
#ifdef GJ_MEMDEBUG
struct meminfo *mi;
#endif
KASSERT(p != NULL, ("p=NULL"));
KASSERT(size > 0, ("size=0"));
mtx_lock(&g_journal_cache_mtx);
KASSERT(g_journal_cache_used >= size, ("Freeing too much?"));
g_journal_cache_used -= size;
mtx_unlock(&g_journal_cache_mtx);
#ifdef GJ_MEMDEBUG
mi = p = (void *)((u_char *)p - sizeof(*mi));
if (mi->mi_size != size) {
printf("GJOURNAL: Size mismatch! %zu != %zu\n", size,
mi->mi_size);
printf("GJOURNAL: Alloc backtrace:\n");
stack_print(&mi->mi_stack);
printf("GJOURNAL: Free backtrace:\n");
kdb_backtrace();
}
#endif
free(p, M_JOURNAL);
}
static void *
gj_realloc(void *p, size_t size, size_t oldsize)
{
void *np;
#ifndef GJ_MEMDEBUG
mtx_lock(&g_journal_cache_mtx);
g_journal_cache_used -= oldsize;
g_journal_cache_used += size;
mtx_unlock(&g_journal_cache_mtx);
np = realloc(p, size, M_JOURNAL, M_WAITOK);
#else
np = gj_malloc(size, M_WAITOK);
bcopy(p, np, MIN(oldsize, size));
gj_free(p, oldsize);
#endif
return (np);
}
static void
g_journal_check_overflow(struct g_journal_softc *sc)
{
off_t length, used;
if ((sc->sc_active.jj_offset < sc->sc_inactive.jj_offset &&
sc->sc_journal_offset >= sc->sc_inactive.jj_offset) ||
(sc->sc_active.jj_offset > sc->sc_inactive.jj_offset &&
sc->sc_journal_offset >= sc->sc_inactive.jj_offset &&
sc->sc_journal_offset < sc->sc_active.jj_offset)) {
panic("Journal overflow "
"(id = %u joffset=%jd active=%jd inactive=%jd)",
(unsigned)sc->sc_id,
(intmax_t)sc->sc_journal_offset,
(intmax_t)sc->sc_active.jj_offset,
(intmax_t)sc->sc_inactive.jj_offset);
}
if (sc->sc_active.jj_offset < sc->sc_inactive.jj_offset) {
length = sc->sc_inactive.jj_offset - sc->sc_active.jj_offset;
used = sc->sc_journal_offset - sc->sc_active.jj_offset;
} else {
length = sc->sc_jend - sc->sc_active.jj_offset;
length += sc->sc_inactive.jj_offset - sc->sc_jstart;
if (sc->sc_journal_offset >= sc->sc_active.jj_offset)
used = sc->sc_journal_offset - sc->sc_active.jj_offset;
else {
used = sc->sc_jend - sc->sc_active.jj_offset;
used += sc->sc_journal_offset - sc->sc_jstart;
}
}
/* Already woken up? */
if (g_journal_switcher_wokenup)
return;
/*
* If the active journal takes more than g_journal_force_switch precent
* of free journal space, we force journal switch.
*/
KASSERT(length > 0,
("length=%jd used=%jd active=%jd inactive=%jd joffset=%jd",
(intmax_t)length, (intmax_t)used,
(intmax_t)sc->sc_active.jj_offset,
(intmax_t)sc->sc_inactive.jj_offset,
(intmax_t)sc->sc_journal_offset));
if ((used * 100) / length > g_journal_force_switch) {
g_journal_stats_journal_full++;
GJ_DEBUG(1, "Journal %s %jd%% full, forcing journal switch.",
sc->sc_name, (used * 100) / length);
mtx_lock(&g_journal_cache_mtx);
g_journal_switcher_wokenup = 1;
wakeup(&g_journal_switcher_state);
mtx_unlock(&g_journal_cache_mtx);
}
}
static void
g_journal_orphan(struct g_consumer *cp)
{
struct g_journal_softc *sc;
char name[256];
int error;
g_topology_assert();
sc = cp->geom->softc;
strlcpy(name, cp->provider->name, sizeof(name));
GJ_DEBUG(0, "Lost provider %s.", name);
if (sc == NULL)
return;
error = g_journal_destroy(sc);
if (error == 0)
GJ_DEBUG(0, "Journal %s destroyed.", name);
else {
GJ_DEBUG(0, "Cannot destroy journal %s (error=%d). "
"Destroy it manually after last close.", sc->sc_name,
error);
}
}
static int
g_journal_access(struct g_provider *pp, int acr, int acw, int ace)
{
struct g_journal_softc *sc;
int dcr, dcw, dce;
g_topology_assert();
GJ_DEBUG(2, "Access request for %s: r%dw%de%d.", pp->name,
acr, acw, ace);
dcr = pp->acr + acr;
dcw = pp->acw + acw;
dce = pp->ace + ace;
sc = pp->geom->softc;
if (sc == NULL || (sc->sc_flags & GJF_DEVICE_DESTROY)) {
if (acr <= 0 && acw <= 0 && ace <= 0)
return (0);
else
return (ENXIO);
}
if (pp->acw == 0 && dcw > 0) {
GJ_DEBUG(1, "Marking %s as dirty.", sc->sc_name);
sc->sc_flags &= ~GJF_DEVICE_CLEAN;
g_topology_unlock();
g_journal_metadata_update(sc);
g_topology_lock();
} /* else if (pp->acw == 0 && dcw > 0 && JEMPTY(sc)) {
GJ_DEBUG(1, "Marking %s as clean.", sc->sc_name);
sc->sc_flags |= GJF_DEVICE_CLEAN;
g_topology_unlock();
g_journal_metadata_update(sc);
g_topology_lock();
} */
return (0);
}
static void
g_journal_header_encode(struct g_journal_header *hdr, u_char *data)
{
bcopy(GJ_HEADER_MAGIC, data, sizeof(GJ_HEADER_MAGIC));
data += sizeof(GJ_HEADER_MAGIC);
le32enc(data, hdr->jh_journal_id);
data += 4;
le32enc(data, hdr->jh_journal_next_id);
}
static int
g_journal_header_decode(const u_char *data, struct g_journal_header *hdr)
{
bcopy(data, hdr->jh_magic, sizeof(hdr->jh_magic));
data += sizeof(hdr->jh_magic);
if (bcmp(hdr->jh_magic, GJ_HEADER_MAGIC, sizeof(GJ_HEADER_MAGIC)) != 0)
return (EINVAL);
hdr->jh_journal_id = le32dec(data);
data += 4;
hdr->jh_journal_next_id = le32dec(data);
return (0);
}
static void
g_journal_flush_cache(struct g_journal_softc *sc)
{
struct bintime bt;
int error;
if (sc->sc_bio_flush == 0)
return;
GJ_TIMER_START(1, &bt);
if (sc->sc_bio_flush & GJ_FLUSH_JOURNAL) {
error = g_io_flush(sc->sc_jconsumer);
GJ_DEBUG(error == 0 ? 2 : 0, "Flush cache of %s: error=%d.",
sc->sc_jconsumer->provider->name, error);
}
if (sc->sc_bio_flush & GJ_FLUSH_DATA) {
/*
* TODO: This could be called in parallel with the
* previous call.
*/
error = g_io_flush(sc->sc_dconsumer);
GJ_DEBUG(error == 0 ? 2 : 0, "Flush cache of %s: error=%d.",
sc->sc_dconsumer->provider->name, error);
}
GJ_TIMER_STOP(1, &bt, "Cache flush time");
}
static int
g_journal_write_header(struct g_journal_softc *sc)
{
struct g_journal_header hdr;
struct g_consumer *cp;
u_char *buf;
int error;
cp = sc->sc_jconsumer;
buf = gj_malloc(cp->provider->sectorsize, M_WAITOK);
strlcpy(hdr.jh_magic, GJ_HEADER_MAGIC, sizeof(hdr.jh_magic));
hdr.jh_journal_id = sc->sc_journal_id;
hdr.jh_journal_next_id = sc->sc_journal_next_id;
g_journal_header_encode(&hdr, buf);
error = g_write_data(cp, sc->sc_journal_offset, buf,
cp->provider->sectorsize);
/* if (error == 0) */
sc->sc_journal_offset += cp->provider->sectorsize;
gj_free(buf, cp->provider->sectorsize);
return (error);
}
/*
* Every journal record has a header and data following it.
* Functions below are used to decode the header before storing it to
* little endian and to encode it after reading to system endianness.
*/
static void
g_journal_record_header_encode(struct g_journal_record_header *hdr,
u_char *data)
{
struct g_journal_entry *ent;
u_int i;
bcopy(GJ_RECORD_HEADER_MAGIC, data, sizeof(GJ_RECORD_HEADER_MAGIC));
data += sizeof(GJ_RECORD_HEADER_MAGIC);
le32enc(data, hdr->jrh_journal_id);
data += 8;
le16enc(data, hdr->jrh_nentries);
data += 2;
bcopy(hdr->jrh_sum, data, sizeof(hdr->jrh_sum));
data += 8;
for (i = 0; i < hdr->jrh_nentries; i++) {
ent = &hdr->jrh_entries[i];
le64enc(data, ent->je_joffset);
data += 8;
le64enc(data, ent->je_offset);
data += 8;
le64enc(data, ent->je_length);
data += 8;
}
}
static int
g_journal_record_header_decode(const u_char *data,
struct g_journal_record_header *hdr)
{
struct g_journal_entry *ent;
u_int i;
bcopy(data, hdr->jrh_magic, sizeof(hdr->jrh_magic));
data += sizeof(hdr->jrh_magic);
if (strcmp(hdr->jrh_magic, GJ_RECORD_HEADER_MAGIC) != 0)
return (EINVAL);
hdr->jrh_journal_id = le32dec(data);
data += 8;
hdr->jrh_nentries = le16dec(data);
data += 2;
if (hdr->jrh_nentries > GJ_RECORD_HEADER_NENTRIES)
return (EINVAL);
bcopy(data, hdr->jrh_sum, sizeof(hdr->jrh_sum));
data += 8;
for (i = 0; i < hdr->jrh_nentries; i++) {
ent = &hdr->jrh_entries[i];
ent->je_joffset = le64dec(data);
data += 8;
ent->je_offset = le64dec(data);
data += 8;
ent->je_length = le64dec(data);
data += 8;
}
return (0);
}
/*
* Function reads metadata from a provider (via the given consumer), decodes
* it to system endianness and verifies its correctness.
*/
static int
g_journal_metadata_read(struct g_consumer *cp, struct g_journal_metadata *md)
{
struct g_provider *pp;
u_char *buf;
int error;
g_topology_assert();
error = g_access(cp, 1, 0, 0);
if (error != 0)
return (error);
pp = cp->provider;
g_topology_unlock();
/* Metadata is stored in last sector. */
buf = g_read_data(cp, pp->mediasize - pp->sectorsize, pp->sectorsize,
&error);
g_topology_lock();
g_access(cp, -1, 0, 0);
if (buf == NULL) {
GJ_DEBUG(1, "Cannot read metadata from %s (error=%d).",
cp->provider->name, error);
return (error);
}
/* Decode metadata. */
error = journal_metadata_decode(buf, md);
g_free(buf);
/* Is this is gjournal provider at all? */
if (strcmp(md->md_magic, G_JOURNAL_MAGIC) != 0)
return (EINVAL);
/*
* Are we able to handle this version of metadata?
* We only maintain backward compatibility.
*/
if (md->md_version > G_JOURNAL_VERSION) {
GJ_DEBUG(0,
"Kernel module is too old to handle metadata from %s.",
cp->provider->name);
return (EINVAL);
}
/* Is checksum correct? */
if (error != 0) {
GJ_DEBUG(0, "MD5 metadata hash mismatch for provider %s.",
cp->provider->name);
return (error);
}
return (0);
}
/*
* Two functions below are responsible for updating metadata.
* Only metadata on the data provider is updated (we need to update
* information about active journal in there).
*/
static void
g_journal_metadata_done(struct bio *bp)
{
/*
* There is not much we can do on error except informing about it.
*/
if (bp->bio_error != 0) {
GJ_LOGREQ(0, bp, "Cannot update metadata (error=%d).",
bp->bio_error);
} else {
GJ_LOGREQ(2, bp, "Metadata updated.");
}
gj_free(bp->bio_data, bp->bio_length);
g_destroy_bio(bp);
}
static void
g_journal_metadata_update(struct g_journal_softc *sc)
{
struct g_journal_metadata md;
struct g_consumer *cp;
struct bio *bp;
u_char *sector;
cp = sc->sc_dconsumer;
sector = gj_malloc(cp->provider->sectorsize, M_WAITOK);
strlcpy(md.md_magic, G_JOURNAL_MAGIC, sizeof(md.md_magic));
md.md_version = G_JOURNAL_VERSION;
md.md_id = sc->sc_id;
md.md_type = sc->sc_orig_type;
md.md_jstart = sc->sc_jstart;
md.md_jend = sc->sc_jend;
md.md_joffset = sc->sc_inactive.jj_offset;
md.md_jid = sc->sc_journal_previous_id;
md.md_flags = 0;
if (sc->sc_flags & GJF_DEVICE_CLEAN)
md.md_flags |= GJ_FLAG_CLEAN;
if (sc->sc_flags & GJF_DEVICE_HARDCODED)
strlcpy(md.md_provider, sc->sc_name, sizeof(md.md_provider));
else
bzero(md.md_provider, sizeof(md.md_provider));
md.md_provsize = cp->provider->mediasize;
journal_metadata_encode(&md, sector);
/*
* Flush the cache, so we know all data are on disk.
* We write here informations like "journal is consistent", so we need
* to be sure it is. Without BIO_FLUSH here, we can end up in situation
* where metadata is stored on disk, but not all data.
*/
g_journal_flush_cache(sc);
bp = g_alloc_bio();
bp->bio_offset = cp->provider->mediasize - cp->provider->sectorsize;
bp->bio_length = cp->provider->sectorsize;
bp->bio_data = sector;
bp->bio_cmd = BIO_WRITE;
if (!(sc->sc_flags & GJF_DEVICE_DESTROY)) {
bp->bio_done = g_journal_metadata_done;
g_io_request(bp, cp);
} else {
bp->bio_done = NULL;
g_io_request(bp, cp);
biowait(bp, "gjmdu");
g_journal_metadata_done(bp);
}
/*
* Be sure metadata reached the disk.
*/
g_journal_flush_cache(sc);
}
/*
* This is where the I/O request comes from the GEOM.
*/
static void
g_journal_start(struct bio *bp)
{
struct g_journal_softc *sc;
sc = bp->bio_to->geom->softc;
GJ_LOGREQ(3, bp, "Request received.");
switch (bp->bio_cmd) {
case BIO_READ:
case BIO_WRITE:
mtx_lock(&sc->sc_mtx);
bioq_insert_tail(&sc->sc_regular_queue, bp);
wakeup(sc);
mtx_unlock(&sc->sc_mtx);
return;
case BIO_GETATTR:
if (strcmp(bp->bio_attribute, "GJOURNAL::provider") == 0) {
strlcpy(bp->bio_data, bp->bio_to->name, bp->bio_length);
bp->bio_completed = strlen(bp->bio_to->name) + 1;
g_io_deliver(bp, 0);
return;
}
/* FALLTHROUGH */
case BIO_DELETE:
default:
g_io_deliver(bp, EOPNOTSUPP);
return;
}
}
static void
g_journal_std_done(struct bio *bp)
{
struct g_journal_softc *sc;
sc = bp->bio_from->geom->softc;
mtx_lock(&sc->sc_mtx);
bioq_insert_tail(&sc->sc_back_queue, bp);
wakeup(sc);
mtx_unlock(&sc->sc_mtx);
}
static struct bio *
g_journal_new_bio(off_t start, off_t end, off_t joffset, u_char *data,
int flags)
{
struct bio *bp;
bp = g_alloc_bio();
bp->bio_offset = start;
bp->bio_joffset = joffset;
bp->bio_length = end - start;
bp->bio_cmd = BIO_WRITE;
bp->bio_done = g_journal_std_done;
if (data == NULL)
bp->bio_data = NULL;
else {
bp->bio_data = gj_malloc(bp->bio_length, flags);
if (bp->bio_data != NULL)
bcopy(data, bp->bio_data, bp->bio_length);
}
return (bp);
}
#define g_journal_insert_bio(head, bp, flags) \
g_journal_insert((head), (bp)->bio_offset, \
(bp)->bio_offset + (bp)->bio_length, (bp)->bio_joffset, \
(bp)->bio_data, flags)
/*
* The function below does a lot more than just inserting bio to the queue.
* It keeps the queue sorted by offset and ensures that there are no doubled
* data (it combines bios where ranges overlap).
*
* The function returns the number of bios inserted (as bio can be splitted).
*/
static int
g_journal_insert(struct bio **head, off_t nstart, off_t nend, off_t joffset,
u_char *data, int flags)
{
struct bio *nbp, *cbp, *pbp;
off_t cstart, cend;
u_char *tmpdata;
int n;
GJ_DEBUG(3, "INSERT(%p): (%jd, %jd, %jd)", *head, nstart, nend,
joffset);
n = 0;
pbp = NULL;
GJQ_FOREACH(*head, cbp) {
cstart = cbp->bio_offset;
cend = cbp->bio_offset + cbp->bio_length;
if (nstart >= cend) {
/*
* +-------------+
* | |
* | current | +-------------+
* | bio | | |
* | | | new |
* +-------------+ | bio |
* | |
* +-------------+
*/
GJ_DEBUG(3, "INSERT(%p): 1", *head);
} else if (nend <= cstart) {
/*
* +-------------+
* | |
* +-------------+ | current |
* | | | bio |
* | new | | |
* | bio | +-------------+
* | |
* +-------------+
*/
nbp = g_journal_new_bio(nstart, nend, joffset, data,
flags);
if (pbp == NULL)
*head = nbp;
else
pbp->bio_next = nbp;
nbp->bio_next = cbp;
n++;
GJ_DEBUG(3, "INSERT(%p): 2 (nbp=%p pbp=%p)", *head, nbp,
pbp);
goto end;
} else if (nstart <= cstart && nend >= cend) {
/*
* +-------------+ +-------------+
* | current bio | | current bio |
* +---+-------------+---+ +-------------+---+
* | | | | | | |
* | | | | | | |
* | +-------------+ | +-------------+ |
* | new bio | | new bio |
* +---------------------+ +-----------------+
*
* +-------------+ +-------------+
* | current bio | | current bio |
* +---+-------------+ +-------------+
* | | | | |
* | | | | |
* | +-------------+ +-------------+
* | new bio | | new bio |
* +-----------------+ +-------------+
*/
g_journal_stats_bytes_skipped += cbp->bio_length;
cbp->bio_offset = nstart;
cbp->bio_joffset = joffset;
cbp->bio_length = cend - nstart;
if (cbp->bio_data != NULL) {
gj_free(cbp->bio_data, cend - cstart);
cbp->bio_data = NULL;
}
if (data != NULL) {
cbp->bio_data = gj_malloc(cbp->bio_length,
flags);
if (cbp->bio_data != NULL) {
bcopy(data, cbp->bio_data,
cbp->bio_length);
}
data += cend - nstart;
}
joffset += cend - nstart;
nstart = cend;
GJ_DEBUG(3, "INSERT(%p): 3 (cbp=%p)", *head, cbp);
} else if (nstart > cstart && nend >= cend) {
/*
* +-----------------+ +-------------+
* | current bio | | current bio |
* | +-------------+ | +---------+---+
* | | | | | | |
* | | | | | | |
* +---+-------------+ +---+---------+ |
* | new bio | | new bio |
* +-------------+ +-------------+
*/
g_journal_stats_bytes_skipped += cend - nstart;
nbp = g_journal_new_bio(nstart, cend, joffset, data,
flags);
nbp->bio_next = cbp->bio_next;
cbp->bio_next = nbp;
cbp->bio_length = nstart - cstart;
if (cbp->bio_data != NULL) {
cbp->bio_data = gj_realloc(cbp->bio_data,
cbp->bio_length, cend - cstart);
}
if (data != NULL)
data += cend - nstart;
joffset += cend - nstart;
nstart = cend;
n++;
GJ_DEBUG(3, "INSERT(%p): 4 (cbp=%p)", *head, cbp);
} else if (nstart > cstart && nend < cend) {
/*
* +---------------------+
* | current bio |
* | +-------------+ |
* | | | |
* | | | |
* +---+-------------+---+
* | new bio |
* +-------------+
*/
g_journal_stats_bytes_skipped += nend - nstart;
nbp = g_journal_new_bio(nstart, nend, joffset, data,
flags);
nbp->bio_next = cbp->bio_next;
cbp->bio_next = nbp;
if (cbp->bio_data == NULL)
tmpdata = NULL;
else
tmpdata = cbp->bio_data + nend - cstart;
nbp = g_journal_new_bio(nend, cend,
cbp->bio_joffset + nend - cstart, tmpdata, flags);
nbp->bio_next = ((struct bio *)cbp->bio_next)->bio_next;
((struct bio *)cbp->bio_next)->bio_next = nbp;
cbp->bio_length = nstart - cstart;
if (cbp->bio_data != NULL) {
cbp->bio_data = gj_realloc(cbp->bio_data,
cbp->bio_length, cend - cstart);
}
n += 2;
GJ_DEBUG(3, "INSERT(%p): 5 (cbp=%p)", *head, cbp);
goto end;
} else if (nstart <= cstart && nend < cend) {
/*
* +-----------------+ +-------------+
* | current bio | | current bio |
* +-------------+ | +---+---------+ |
* | | | | | | |
* | | | | | | |
* +-------------+---+ | +---------+---+
* | new bio | | new bio |
* +-------------+ +-------------+
*/
g_journal_stats_bytes_skipped += nend - nstart;
nbp = g_journal_new_bio(nstart, nend, joffset, data,
flags);
if (pbp == NULL)
*head = nbp;
else
pbp->bio_next = nbp;
nbp->bio_next = cbp;
cbp->bio_offset = nend;
cbp->bio_length = cend - nend;
cbp->bio_joffset += nend - cstart;
tmpdata = cbp->bio_data;
if (tmpdata != NULL) {
cbp->bio_data = gj_malloc(cbp->bio_length,
flags);
if (cbp->bio_data != NULL) {
bcopy(tmpdata + nend - cstart,
cbp->bio_data, cbp->bio_length);
}
gj_free(tmpdata, cend - cstart);
}
n++;
GJ_DEBUG(3, "INSERT(%p): 6 (cbp=%p)", *head, cbp);
goto end;
}
if (nstart == nend)
goto end;
pbp = cbp;
}
nbp = g_journal_new_bio(nstart, nend, joffset, data, flags);
if (pbp == NULL)
*head = nbp;
else
pbp->bio_next = nbp;
nbp->bio_next = NULL;
n++;
GJ_DEBUG(3, "INSERT(%p): 8 (nbp=%p pbp=%p)", *head, nbp, pbp);
end:
if (g_journal_debug >= 3) {
GJQ_FOREACH(*head, cbp) {
GJ_DEBUG(3, "ELEMENT: %p (%jd, %jd, %jd, %p)", cbp,
(intmax_t)cbp->bio_offset,
(intmax_t)cbp->bio_length,
(intmax_t)cbp->bio_joffset, cbp->bio_data);
}
GJ_DEBUG(3, "INSERT(%p): DONE %d", *head, n);
}
return (n);
}
/*
* The function combines neighbour bios trying to squeeze as much data as
* possible into one bio.
*
* The function returns the number of bios combined (negative value).
*/
static int
g_journal_optimize(struct bio *head)
{
struct bio *cbp, *pbp;
int n;
n = 0;
pbp = NULL;
GJQ_FOREACH(head, cbp) {
/* Skip bios which has to be read first. */
if (cbp->bio_data == NULL) {
pbp = NULL;
continue;
}
/* There is no previous bio yet. */
if (pbp == NULL) {
pbp = cbp;
continue;
}
/* Is this a neighbour bio? */
if (pbp->bio_offset + pbp->bio_length != cbp->bio_offset) {
/* Be sure that bios queue is sorted. */
KASSERT(pbp->bio_offset + pbp->bio_length < cbp->bio_offset,
("poffset=%jd plength=%jd coffset=%jd",
(intmax_t)pbp->bio_offset,
(intmax_t)pbp->bio_length,
(intmax_t)cbp->bio_offset));
pbp = cbp;
continue;
}
/* Be sure we don't end up with too big bio. */
if (pbp->bio_length + cbp->bio_length > MAXPHYS) {
pbp = cbp;
continue;
}
/* Ok, we can join bios. */
GJ_LOGREQ(4, pbp, "Join: ");
GJ_LOGREQ(4, cbp, "and: ");
pbp->bio_data = gj_realloc(pbp->bio_data,
pbp->bio_length + cbp->bio_length, pbp->bio_length);
bcopy(cbp->bio_data, pbp->bio_data + pbp->bio_length,
cbp->bio_length);
gj_free(cbp->bio_data, cbp->bio_length);
pbp->bio_length += cbp->bio_length;
pbp->bio_next = cbp->bio_next;
g_destroy_bio(cbp);
cbp = pbp;
g_journal_stats_combined_ios++;
n--;
GJ_LOGREQ(4, pbp, "Got: ");
}
return (n);
}
/*
* TODO: Update comment.
* These are functions responsible for copying one portion of data from journal
* to the destination provider.
* The order goes like this:
* 1. Read the header, which contains informations about data blocks
* following it.
* 2. Read the data blocks from the journal.
* 3. Write the data blocks on the data provider.
*
* g_journal_copy_start()
* g_journal_copy_done() - got finished write request, logs potential errors.
*/
/*
* When there is no data in cache, this function is used to read it.
*/
static void
g_journal_read_first(struct g_journal_softc *sc, struct bio *bp)
{
struct bio *cbp;
/*
* We were short in memory, so data was freed.
* In that case we need to read it back from journal.
*/
cbp = g_alloc_bio();
cbp->bio_cflags = bp->bio_cflags;
cbp->bio_parent = bp;
cbp->bio_offset = bp->bio_joffset;
cbp->bio_length = bp->bio_length;
cbp->bio_data = gj_malloc(bp->bio_length, M_WAITOK);
cbp->bio_cmd = BIO_READ;
cbp->bio_done = g_journal_std_done;
GJ_LOGREQ(4, cbp, "READ FIRST");
g_io_request(cbp, sc->sc_jconsumer);
g_journal_cache_misses++;
}
static void
g_journal_copy_send(struct g_journal_softc *sc)
{
struct bio *bioq, *bp, *lbp;
bioq = lbp = NULL;
mtx_lock(&sc->sc_mtx);
for (; sc->sc_copy_in_progress < g_journal_parallel_copies;) {
bp = GJQ_FIRST(sc->sc_inactive.jj_queue);
if (bp == NULL)
break;
GJQ_REMOVE(sc->sc_inactive.jj_queue, bp);
sc->sc_copy_in_progress++;
GJQ_INSERT_AFTER(bioq, bp, lbp);
lbp = bp;
}
mtx_unlock(&sc->sc_mtx);
if (g_journal_do_optimize)
sc->sc_copy_in_progress += g_journal_optimize(bioq);
while ((bp = GJQ_FIRST(bioq)) != NULL) {
GJQ_REMOVE(bioq, bp);
GJQ_INSERT_HEAD(sc->sc_copy_queue, bp);
bp->bio_cflags = GJ_BIO_COPY;
if (bp->bio_data == NULL)
g_journal_read_first(sc, bp);
else {
bp->bio_joffset = 0;
GJ_LOGREQ(4, bp, "SEND");
g_io_request(bp, sc->sc_dconsumer);
}
}
}
static void
g_journal_copy_start(struct g_journal_softc *sc)
{
/*
* Remember in metadata that we're starting to copy journaled data
* to the data provider.
* In case of power failure, we will copy these data once again on boot.
*/
if (!sc->sc_journal_copying) {
sc->sc_journal_copying = 1;
GJ_DEBUG(1, "Starting copy of journal.");
g_journal_metadata_update(sc);
}
g_journal_copy_send(sc);
}
/*
* Data block has been read from the journal provider.
*/
static int
g_journal_copy_read_done(struct bio *bp)
{
struct g_journal_softc *sc;
struct g_consumer *cp;
struct bio *pbp;
KASSERT(bp->bio_cflags == GJ_BIO_COPY,
("Invalid bio (%d != %d).", bp->bio_cflags, GJ_BIO_COPY));
sc = bp->bio_from->geom->softc;
pbp = bp->bio_parent;
if (bp->bio_error != 0) {
GJ_DEBUG(0, "Error while reading data from %s (error=%d).",
bp->bio_to->name, bp->bio_error);
/*
* We will not be able to deliver WRITE request as well.
*/
gj_free(bp->bio_data, bp->bio_length);
g_destroy_bio(pbp);
g_destroy_bio(bp);
sc->sc_copy_in_progress--;
return (1);
}
pbp->bio_data = bp->bio_data;
cp = sc->sc_dconsumer;
g_io_request(pbp, cp);
GJ_LOGREQ(4, bp, "READ DONE");
g_destroy_bio(bp);
return (0);
}
/*
* Data block has been written to the data provider.
*/
static void
g_journal_copy_write_done(struct bio *bp)
{
struct g_journal_softc *sc;
KASSERT(bp->bio_cflags == GJ_BIO_COPY,
("Invalid bio (%d != %d).", bp->bio_cflags, GJ_BIO_COPY));
sc = bp->bio_from->geom->softc;
sc->sc_copy_in_progress--;
if (bp->bio_error != 0) {
GJ_LOGREQ(0, bp, "[copy] Error while writing data (error=%d)",
bp->bio_error);
}
GJQ_REMOVE(sc->sc_copy_queue, bp);
gj_free(bp->bio_data, bp->bio_length);
GJ_LOGREQ(4, bp, "DONE");
g_destroy_bio(bp);
if (sc->sc_copy_in_progress == 0) {
/*
* This was the last write request for this journal.
*/
GJ_DEBUG(1, "Data has been copied.");
sc->sc_journal_copying = 0;
}
}
static void g_journal_flush_done(struct bio *bp);
/*
* Flush one record onto active journal provider.
*/
static void
g_journal_flush(struct g_journal_softc *sc)
{
struct g_journal_record_header hdr;
struct g_journal_entry *ent;
struct g_provider *pp;
struct bio **bioq;
struct bio *bp, *fbp, *pbp;
off_t joffset;
u_char *data, hash[16];
MD5_CTX ctx;
u_int i;
if (sc->sc_current_count == 0)
return;
pp = sc->sc_jprovider;
GJ_VALIDATE_OFFSET(sc->sc_journal_offset, sc);
joffset = sc->sc_journal_offset;
GJ_DEBUG(2, "Storing %d journal entries on %s at %jd.",
sc->sc_current_count, pp->name, (intmax_t)joffset);
/*
* Store 'journal id', so we know to which journal this record belongs.
*/
hdr.jrh_journal_id = sc->sc_journal_id;
/* Could be less than g_journal_record_entries if called due timeout. */
hdr.jrh_nentries = MIN(sc->sc_current_count, g_journal_record_entries);
strlcpy(hdr.jrh_magic, GJ_RECORD_HEADER_MAGIC, sizeof(hdr.jrh_magic));
bioq = &sc->sc_active.jj_queue;
GJQ_LAST(sc->sc_flush_queue, pbp);
fbp = g_alloc_bio();
fbp->bio_parent = NULL;
fbp->bio_cflags = GJ_BIO_JOURNAL;
fbp->bio_offset = -1;
fbp->bio_joffset = joffset;
fbp->bio_length = pp->sectorsize;
fbp->bio_cmd = BIO_WRITE;
fbp->bio_done = g_journal_std_done;
GJQ_INSERT_AFTER(sc->sc_flush_queue, fbp, pbp);
pbp = fbp;
fbp->bio_to = pp;
GJ_LOGREQ(4, fbp, "FLUSH_OUT");
joffset += pp->sectorsize;
sc->sc_flush_count++;
if (sc->sc_flags & GJF_DEVICE_CHECKSUM)
MD5Init(&ctx);
for (i = 0; i < hdr.jrh_nentries; i++) {
bp = sc->sc_current_queue;
KASSERT(bp != NULL, ("NULL bp"));
bp->bio_to = pp;
GJ_LOGREQ(4, bp, "FLUSHED");
sc->sc_current_queue = bp->bio_next;
bp->bio_next = NULL;
sc->sc_current_count--;
/* Add to the header. */
ent = &hdr.jrh_entries[i];
ent->je_offset = bp->bio_offset;
ent->je_joffset = joffset;
ent->je_length = bp->bio_length;
data = bp->bio_data;
if (sc->sc_flags & GJF_DEVICE_CHECKSUM)
MD5Update(&ctx, data, ent->je_length);
g_reset_bio(bp);
bp->bio_cflags = GJ_BIO_JOURNAL;
bp->bio_offset = ent->je_offset;
bp->bio_joffset = ent->je_joffset;
bp->bio_length = ent->je_length;
bp->bio_data = data;
bp->bio_cmd = BIO_WRITE;
bp->bio_done = g_journal_std_done;
GJQ_INSERT_AFTER(sc->sc_flush_queue, bp, pbp);
pbp = bp;
bp->bio_to = pp;
GJ_LOGREQ(4, bp, "FLUSH_OUT");
joffset += bp->bio_length;
sc->sc_flush_count++;
/*
* Add request to the active sc_journal_queue queue.
* This is our cache. After journal switch we don't have to
* read the data from the inactive journal, because we keep
* it in memory.
*/
g_journal_insert(bioq, ent->je_offset,
ent->je_offset + ent->je_length, ent->je_joffset, data,
M_NOWAIT);
}
/*
* After all requests, store valid header.
*/
data = gj_malloc(pp->sectorsize, M_WAITOK);
if (sc->sc_flags & GJF_DEVICE_CHECKSUM) {
MD5Final(hash, &ctx);
bcopy(hash, hdr.jrh_sum, sizeof(hdr.jrh_sum));
}
g_journal_record_header_encode(&hdr, data);
fbp->bio_data = data;
sc->sc_journal_offset = joffset;
g_journal_check_overflow(sc);
}
/*
* Flush request finished.
*/
static void
g_journal_flush_done(struct bio *bp)
{
struct g_journal_softc *sc;
struct g_consumer *cp;
KASSERT((bp->bio_cflags & GJ_BIO_MASK) == GJ_BIO_JOURNAL,
("Invalid bio (%d != %d).", bp->bio_cflags, GJ_BIO_JOURNAL));
cp = bp->bio_from;
sc = cp->geom->softc;
sc->sc_flush_in_progress--;
if (bp->bio_error != 0) {
GJ_LOGREQ(0, bp, "[flush] Error while writing data (error=%d)",
bp->bio_error);
}
gj_free(bp->bio_data, bp->bio_length);
GJ_LOGREQ(4, bp, "DONE");
g_destroy_bio(bp);
}
static void g_journal_release_delayed(struct g_journal_softc *sc);
static void
g_journal_flush_send(struct g_journal_softc *sc)
{
struct g_consumer *cp;
struct bio *bioq, *bp, *lbp;
cp = sc->sc_jconsumer;
bioq = lbp = NULL;
while (sc->sc_flush_in_progress < g_journal_parallel_flushes) {
/* Send one flush requests to the active journal. */
bp = GJQ_FIRST(sc->sc_flush_queue);
if (bp != NULL) {
GJQ_REMOVE(sc->sc_flush_queue, bp);
sc->sc_flush_count--;
bp->bio_offset = bp->bio_joffset;
bp->bio_joffset = 0;
sc->sc_flush_in_progress++;
GJQ_INSERT_AFTER(bioq, bp, lbp);
lbp = bp;
}
/* Try to release delayed requests. */
g_journal_release_delayed(sc);
/* If there are no requests to flush, leave. */
if (GJQ_FIRST(sc->sc_flush_queue) == NULL)
break;
}
if (g_journal_do_optimize)
sc->sc_flush_in_progress += g_journal_optimize(bioq);
while ((bp = GJQ_FIRST(bioq)) != NULL) {
GJQ_REMOVE(bioq, bp);
GJ_LOGREQ(3, bp, "Flush request send");
g_io_request(bp, cp);
}
}
static void
g_journal_add_current(struct g_journal_softc *sc, struct bio *bp)
{
int n;
GJ_LOGREQ(4, bp, "CURRENT %d", sc->sc_current_count);
n = g_journal_insert_bio(&sc->sc_current_queue, bp, M_WAITOK);
sc->sc_current_count += n;
n = g_journal_optimize(sc->sc_current_queue);
sc->sc_current_count += n;
/*
* For requests which are added to the current queue we deliver
* response immediately.
*/
bp->bio_completed = bp->bio_length;
g_io_deliver(bp, 0);
if (sc->sc_current_count >= g_journal_record_entries) {
/*
* Let's flush one record onto active journal provider.
*/
g_journal_flush(sc);
}
}
static void
g_journal_release_delayed(struct g_journal_softc *sc)
{
struct bio *bp;
for (;;) {
/* The flush queue is full, exit. */
if (sc->sc_flush_count >= g_journal_accept_immediately)
return;
bp = bioq_takefirst(&sc->sc_delayed_queue);
if (bp == NULL)
return;
sc->sc_delayed_count--;
g_journal_add_current(sc, bp);
}
}
/*
* Add I/O request to the current queue. If we have enough requests for one
* journal record we flush them onto active journal provider.
*/
static void
g_journal_add_request(struct g_journal_softc *sc, struct bio *bp)
{
/*
* The flush queue is full, we need to delay the request.
*/
if (sc->sc_delayed_count > 0 ||
sc->sc_flush_count >= g_journal_accept_immediately) {
GJ_LOGREQ(4, bp, "DELAYED");
bioq_insert_tail(&sc->sc_delayed_queue, bp);
sc->sc_delayed_count++;
return;
}
KASSERT(TAILQ_EMPTY(&sc->sc_delayed_queue.queue),
("DELAYED queue not empty."));
g_journal_add_current(sc, bp);
}
static void g_journal_read_done(struct bio *bp);
/*
* Try to find requested data in cache.
*/
static struct bio *
g_journal_read_find(struct bio *head, int sorted, struct bio *pbp, off_t ostart,
off_t oend)
{
off_t cstart, cend;
struct bio *bp;
GJQ_FOREACH(head, bp) {
if (bp->bio_offset == -1)
continue;
cstart = MAX(ostart, bp->bio_offset);
cend = MIN(oend, bp->bio_offset + bp->bio_length);
if (cend <= ostart)
continue;
else if (cstart >= oend) {
if (!sorted)
continue;
else {
bp = NULL;
break;
}
}
if (bp->bio_data == NULL)
break;
GJ_DEBUG(3, "READ(%p): (%jd, %jd) (bp=%p)", head, cstart, cend,
bp);
bcopy(bp->bio_data + cstart - bp->bio_offset,
pbp->bio_data + cstart - pbp->bio_offset, cend - cstart);
pbp->bio_completed += cend - cstart;
if (pbp->bio_completed == pbp->bio_length) {
/*
* Cool, the whole request was in cache, deliver happy
* message.
*/
g_io_deliver(pbp, 0);
return (pbp);
}
break;
}
return (bp);
}
/*
* This function is used for collecting data on read.
* The complexity is because parts of the data can be stored in four different
* places:
* - in memory - the data not yet send to the active journal provider
* - in the active journal
* - in the inactive journal
* - in the data provider
*/
static void
g_journal_read(struct g_journal_softc *sc, struct bio *pbp, off_t ostart,
off_t oend)
{
struct bio *bp, *nbp, *head;
off_t cstart, cend;
u_int i, sorted = 0;
GJ_DEBUG(3, "READ: (%jd, %jd)", ostart, oend);
cstart = cend = -1;
bp = NULL;
head = NULL;
for (i = 1; i <= 5; i++) {
switch (i) {
case 1: /* Not-yet-send data. */
head = sc->sc_current_queue;
sorted = 1;
break;
case 2: /* Skip flush queue as they are also in active queue */
continue;
case 3: /* Active journal. */
head = sc->sc_active.jj_queue;
sorted = 1;
break;
case 4: /* Inactive journal. */
/*
* XXX: Here could be a race with g_journal_lowmem().
*/
head = sc->sc_inactive.jj_queue;
sorted = 1;
break;
case 5: /* In-flight to the data provider. */
head = sc->sc_copy_queue;
sorted = 0;
break;
default:
panic("gjournal %s: i=%d", __func__, i);
}
bp = g_journal_read_find(head, sorted, pbp, ostart, oend);
if (bp == pbp) { /* Got the whole request. */
GJ_DEBUG(2, "Got the whole request from %u.", i);
return;
} else if (bp != NULL) {
cstart = MAX(ostart, bp->bio_offset);
cend = MIN(oend, bp->bio_offset + bp->bio_length);
GJ_DEBUG(2, "Got part of the request from %u (%jd-%jd).",
i, (intmax_t)cstart, (intmax_t)cend);
break;
}
}
if (bp != NULL) {
if (bp->bio_data == NULL) {
nbp = g_duplicate_bio(pbp);
nbp->bio_cflags = GJ_BIO_READ;
nbp->bio_data =
pbp->bio_data + cstart - pbp->bio_offset;
nbp->bio_offset =
bp->bio_joffset + cstart - bp->bio_offset;
nbp->bio_length = cend - cstart;
nbp->bio_done = g_journal_read_done;
g_io_request(nbp, sc->sc_jconsumer);
}
/*
* If we don't have the whole request yet, call g_journal_read()
* recursively.
*/
if (ostart < cstart)
g_journal_read(sc, pbp, ostart, cstart);
if (oend > cend)
g_journal_read(sc, pbp, cend, oend);
} else {
/*
* No data in memory, no data in journal.
* Its time for asking data provider.
*/
GJ_DEBUG(3, "READ(data): (%jd, %jd)", ostart, oend);
nbp = g_duplicate_bio(pbp);
nbp->bio_cflags = GJ_BIO_READ;
nbp->bio_data = pbp->bio_data + ostart - pbp->bio_offset;
nbp->bio_offset = ostart;
nbp->bio_length = oend - ostart;
nbp->bio_done = g_journal_read_done;
g_io_request(nbp, sc->sc_dconsumer);
/* We have the whole request, return here. */
return;
}
}
/*
* Function responsible for handling finished READ requests.
* Actually, g_std_done() could be used here, the only difference is that we
* log error.
*/
static void
g_journal_read_done(struct bio *bp)
{
struct bio *pbp;
KASSERT(bp->bio_cflags == GJ_BIO_READ,
("Invalid bio (%d != %d).", bp->bio_cflags, GJ_BIO_READ));
pbp = bp->bio_parent;
pbp->bio_inbed++;
pbp->bio_completed += bp->bio_length;
if (bp->bio_error != 0) {
if (pbp->bio_error == 0)
pbp->bio_error = bp->bio_error;
GJ_DEBUG(0, "Error while reading data from %s (error=%d).",
bp->bio_to->name, bp->bio_error);
}
g_destroy_bio(bp);
if (pbp->bio_children == pbp->bio_inbed &&
pbp->bio_completed == pbp->bio_length) {
/* We're done. */
g_io_deliver(pbp, 0);
}
}
/*
* Deactive current journal and active next one.
*/
static void
g_journal_switch(struct g_journal_softc *sc)
{
struct g_provider *pp;
if (JEMPTY(sc)) {
GJ_DEBUG(3, "No need for %s switch.", sc->sc_name);
pp = LIST_FIRST(&sc->sc_geom->provider);
if (!(sc->sc_flags & GJF_DEVICE_CLEAN) && pp->acw == 0) {
sc->sc_flags |= GJF_DEVICE_CLEAN;
GJ_DEBUG(1, "Marking %s as clean.", sc->sc_name);
g_journal_metadata_update(sc);
}
} else {
GJ_DEBUG(3, "Switching journal %s.", sc->sc_geom->name);
pp = sc->sc_jprovider;
sc->sc_journal_previous_id = sc->sc_journal_id;
sc->sc_journal_id = sc->sc_journal_next_id;
sc->sc_journal_next_id = arc4random();
GJ_VALIDATE_OFFSET(sc->sc_journal_offset, sc);
g_journal_write_header(sc);
sc->sc_inactive.jj_offset = sc->sc_active.jj_offset;
sc->sc_inactive.jj_queue = sc->sc_active.jj_queue;
sc->sc_active.jj_offset =
sc->sc_journal_offset - pp->sectorsize;
sc->sc_active.jj_queue = NULL;
/*
* Switch is done, start copying data from the (now) inactive
* journal to the data provider.
*/
g_journal_copy_start(sc);
}
mtx_lock(&sc->sc_mtx);
sc->sc_flags &= ~GJF_DEVICE_SWITCH;
mtx_unlock(&sc->sc_mtx);
}
static void
g_journal_initialize(struct g_journal_softc *sc)
{
sc->sc_journal_id = arc4random();
sc->sc_journal_next_id = arc4random();
sc->sc_journal_previous_id = sc->sc_journal_id;
sc->sc_journal_offset = sc->sc_jstart;
sc->sc_inactive.jj_offset = sc->sc_jstart;
g_journal_write_header(sc);
sc->sc_active.jj_offset = sc->sc_jstart;
}
static void
g_journal_mark_as_dirty(struct g_journal_softc *sc)
{
const struct g_journal_desc *desc;
int i;
GJ_DEBUG(1, "Marking file system %s as dirty.", sc->sc_name);
for (i = 0; (desc = g_journal_filesystems[i]) != NULL; i++)
desc->jd_dirty(sc->sc_dconsumer);
}
/*
* Function read record header from the given journal.
* It is very simlar to g_read_data(9), but it doesn't allocate memory for bio
* and data on every call.
*/
static int
g_journal_sync_read(struct g_consumer *cp, struct bio *bp, off_t offset,
void *data)
{
int error;
g_reset_bio(bp);
bp->bio_cmd = BIO_READ;
bp->bio_done = NULL;
bp->bio_offset = offset;
bp->bio_length = cp->provider->sectorsize;
bp->bio_data = data;
g_io_request(bp, cp);
error = biowait(bp, "gjs_read");
return (error);
}
#if 0
/*
* Function is called when we start the journal device and we detect that
* one of the journals was not fully copied.
* The purpose of this function is to read all records headers from journal
* and placed them in the inactive queue, so we can start journal
* synchronization process and the journal provider itself.
* Design decision was taken to not synchronize the whole journal here as it
* can take too much time. Reading headers only and delaying synchronization
* process until after journal provider is started should be the best choice.
*/
#endif
static void
g_journal_sync(struct g_journal_softc *sc)
{
struct g_journal_record_header rhdr;
struct g_journal_entry *ent;
struct g_journal_header jhdr;
struct g_consumer *cp;
struct bio *bp, *fbp, *tbp;
off_t joffset, offset;
u_char *buf, sum[16];
uint64_t id;
MD5_CTX ctx;
int error, found, i;
found = 0;
fbp = NULL;
cp = sc->sc_jconsumer;
bp = g_alloc_bio();
buf = gj_malloc(cp->provider->sectorsize, M_WAITOK);
offset = joffset = sc->sc_inactive.jj_offset = sc->sc_journal_offset;
GJ_DEBUG(2, "Looking for termination at %jd.", (intmax_t)joffset);
/*
* Read and decode first journal header.
*/
error = g_journal_sync_read(cp, bp, offset, buf);
if (error != 0) {
GJ_DEBUG(0, "Error while reading journal header from %s.",
cp->provider->name);
goto end;
}
error = g_journal_header_decode(buf, &jhdr);
if (error != 0) {
GJ_DEBUG(0, "Cannot decode journal header from %s.",
cp->provider->name);
goto end;
}
id = sc->sc_journal_id;
if (jhdr.jh_journal_id != sc->sc_journal_id) {
GJ_DEBUG(1, "Journal ID mismatch at %jd (0x%08x != 0x%08x).",
(intmax_t)offset, (u_int)jhdr.jh_journal_id, (u_int)id);
goto end;
}
offset += cp->provider->sectorsize;
id = sc->sc_journal_next_id = jhdr.jh_journal_next_id;
for (;;) {
/*
* If the biggest record won't fit, look for a record header or
* journal header from the beginning.
*/
GJ_VALIDATE_OFFSET(offset, sc);
error = g_journal_sync_read(cp, bp, offset, buf);
if (error != 0) {
/*
* Not good. Having an error while reading header
* means, that we cannot read next headers and in
* consequence we cannot find termination.
*/
GJ_DEBUG(0,
"Error while reading record header from %s.",
cp->provider->name);
break;
}
error = g_journal_record_header_decode(buf, &rhdr);
if (error != 0) {
GJ_DEBUG(2, "Not a record header at %jd (error=%d).",
(intmax_t)offset, error);
/*
* This is not a record header.
* If we are lucky, this is next journal header.
*/
error = g_journal_header_decode(buf, &jhdr);
if (error != 0) {
GJ_DEBUG(1, "Not a journal header at %jd (error=%d).",
(intmax_t)offset, error);
/*
* Nope, this is not journal header, which
* bascially means that journal is not
* terminated properly.
*/
error = ENOENT;
break;
}
/*
* Ok. This is header of _some_ journal. Now we need to
* verify if this is header of the _next_ journal.
*/
if (jhdr.jh_journal_id != id) {
GJ_DEBUG(1, "Journal ID mismatch at %jd "
"(0x%08x != 0x%08x).", (intmax_t)offset,
(u_int)jhdr.jh_journal_id, (u_int)id);
error = ENOENT;
break;
}
/* Found termination. */
found++;
GJ_DEBUG(1, "Found termination at %jd (id=0x%08x).",
(intmax_t)offset, (u_int)id);
sc->sc_active.jj_offset = offset;
sc->sc_journal_offset =
offset + cp->provider->sectorsize;
sc->sc_journal_id = id;
id = sc->sc_journal_next_id = jhdr.jh_journal_next_id;
while ((tbp = fbp) != NULL) {
fbp = tbp->bio_next;
GJ_LOGREQ(3, tbp, "Adding request.");
g_journal_insert_bio(&sc->sc_inactive.jj_queue,
tbp, M_WAITOK);
}
/* Skip journal's header. */
offset += cp->provider->sectorsize;
continue;
}
/* Skip record's header. */
offset += cp->provider->sectorsize;
/*
* Add information about every record entry to the inactive
* queue.
*/
if (sc->sc_flags & GJF_DEVICE_CHECKSUM)
MD5Init(&ctx);
for (i = 0; i < rhdr.jrh_nentries; i++) {
ent = &rhdr.jrh_entries[i];
GJ_DEBUG(3, "Insert entry: %jd %jd.",
(intmax_t)ent->je_offset, (intmax_t)ent->je_length);
g_journal_insert(&fbp, ent->je_offset,
ent->je_offset + ent->je_length, ent->je_joffset,
NULL, M_WAITOK);
if (sc->sc_flags & GJF_DEVICE_CHECKSUM) {
u_char *buf2;
/*
* TODO: Should use faster function (like
* g_journal_sync_read()).
*/
buf2 = g_read_data(cp, offset, ent->je_length,
NULL);
if (buf2 == NULL)
GJ_DEBUG(0, "Cannot read data at %jd.",
(intmax_t)offset);
else {
MD5Update(&ctx, buf2, ent->je_length);
g_free(buf2);
}
}
/* Skip entry's data. */
offset += ent->je_length;
}
if (sc->sc_flags & GJF_DEVICE_CHECKSUM) {
MD5Final(sum, &ctx);
if (bcmp(sum, rhdr.jrh_sum, sizeof(rhdr.jrh_sum)) != 0) {
GJ_DEBUG(0, "MD5 hash mismatch at %jd!",
(intmax_t)offset);
}
}
}
end:
gj_free(bp->bio_data, cp->provider->sectorsize);
g_destroy_bio(bp);
/* Remove bios from unterminated journal. */
while ((tbp = fbp) != NULL) {
fbp = tbp->bio_next;
g_destroy_bio(tbp);
}
if (found < 1 && joffset > 0) {
GJ_DEBUG(0, "Journal on %s is broken/corrupted. Initializing.",
sc->sc_name);
while ((tbp = sc->sc_inactive.jj_queue) != NULL) {
sc->sc_inactive.jj_queue = tbp->bio_next;
g_destroy_bio(tbp);
}
g_journal_initialize(sc);
g_journal_mark_as_dirty(sc);
} else {
GJ_DEBUG(0, "Journal %s consistent.", sc->sc_name);
g_journal_copy_start(sc);
}
}
/*
* Wait for requests.
* If we have requests in the current queue, flush them after 3 seconds from the
* last flush. In this way we don't wait forever (or for journal switch) with
* storing not full records on journal.
*/
static void
g_journal_wait(struct g_journal_softc *sc, time_t last_write)
{
int error, timeout;
GJ_DEBUG(3, "%s: enter", __func__);
if (sc->sc_current_count == 0) {
if (g_journal_debug < 2)
msleep(sc, &sc->sc_mtx, PRIBIO | PDROP, "gj:work", 0);
else {
/*
* If we have debug turned on, show number of elements
* in various queues.
*/
for (;;) {
error = msleep(sc, &sc->sc_mtx, PRIBIO,
"gj:work", hz * 3);
if (error == 0) {
mtx_unlock(&sc->sc_mtx);
break;
}
GJ_DEBUG(3, "Report: current count=%d",
sc->sc_current_count);
GJ_DEBUG(3, "Report: flush count=%d",
sc->sc_flush_count);
GJ_DEBUG(3, "Report: flush in progress=%d",
sc->sc_flush_in_progress);
GJ_DEBUG(3, "Report: copy in progress=%d",
sc->sc_copy_in_progress);
GJ_DEBUG(3, "Report: delayed=%d",
sc->sc_delayed_count);
}
}
GJ_DEBUG(3, "%s: exit 1", __func__);
return;
}
/*
* Flush even not full records every 3 seconds.
*/
timeout = (last_write + 3 - time_second) * hz;
if (timeout <= 0) {
mtx_unlock(&sc->sc_mtx);
g_journal_flush(sc);
g_journal_flush_send(sc);
GJ_DEBUG(3, "%s: exit 2", __func__);
return;
}
error = msleep(sc, &sc->sc_mtx, PRIBIO | PDROP, "gj:work", timeout);
if (error == EWOULDBLOCK)
g_journal_flush_send(sc);
GJ_DEBUG(3, "%s: exit 3", __func__);
}
/*
* Worker thread.
*/
static void
g_journal_worker(void *arg)
{
struct g_journal_softc *sc;
struct g_geom *gp;
struct g_provider *pp;
struct bio *bp;
time_t last_write;
int type;
thread_lock(curthread);
sched_prio(curthread, PRIBIO);
thread_unlock(curthread);
sc = arg;
type = 0; /* gcc */
if (sc->sc_flags & GJF_DEVICE_CLEAN) {
GJ_DEBUG(0, "Journal %s clean.", sc->sc_name);
g_journal_initialize(sc);
} else {
g_journal_sync(sc);
}
/*
* Check if we can use BIO_FLUSH.
*/
sc->sc_bio_flush = 0;
if (g_io_flush(sc->sc_jconsumer) == 0) {
sc->sc_bio_flush |= GJ_FLUSH_JOURNAL;
GJ_DEBUG(1, "BIO_FLUSH supported by %s.",
sc->sc_jconsumer->provider->name);
} else {
GJ_DEBUG(0, "BIO_FLUSH not supported by %s.",
sc->sc_jconsumer->provider->name);
}
if (sc->sc_jconsumer != sc->sc_dconsumer) {
if (g_io_flush(sc->sc_dconsumer) == 0) {
sc->sc_bio_flush |= GJ_FLUSH_DATA;
GJ_DEBUG(1, "BIO_FLUSH supported by %s.",
sc->sc_dconsumer->provider->name);
} else {
GJ_DEBUG(0, "BIO_FLUSH not supported by %s.",
sc->sc_dconsumer->provider->name);
}
}
gp = sc->sc_geom;
g_topology_lock();
pp = g_new_providerf(gp, "%s.journal", sc->sc_name);
pp->mediasize = sc->sc_mediasize;
/*
* There could be a problem when data provider and journal providers
* have different sectorsize, but such scenario is prevented on journal
* creation.
*/
pp->sectorsize = sc->sc_sectorsize;
g_error_provider(pp, 0);
g_topology_unlock();
last_write = time_second;
if (sc->sc_rootmount != NULL) {
GJ_DEBUG(1, "root_mount_rel %p", sc->sc_rootmount);
root_mount_rel(sc->sc_rootmount);
sc->sc_rootmount = NULL;
}
for (;;) {
/* Get first request from the queue. */
mtx_lock(&sc->sc_mtx);
bp = bioq_first(&sc->sc_back_queue);
if (bp != NULL)
type = (bp->bio_cflags & GJ_BIO_MASK);
if (bp == NULL) {
bp = bioq_first(&sc->sc_regular_queue);
if (bp != NULL)
type = GJ_BIO_REGULAR;
}
if (bp == NULL) {
try_switch:
if ((sc->sc_flags & GJF_DEVICE_SWITCH) ||
(sc->sc_flags & GJF_DEVICE_DESTROY)) {
if (sc->sc_current_count > 0) {
mtx_unlock(&sc->sc_mtx);
g_journal_flush(sc);
g_journal_flush_send(sc);
continue;
}
if (sc->sc_flush_in_progress > 0)
goto sleep;
if (sc->sc_copy_in_progress > 0)
goto sleep;
}
if (sc->sc_flags & GJF_DEVICE_SWITCH) {
mtx_unlock(&sc->sc_mtx);
g_journal_switch(sc);
wakeup(&sc->sc_journal_copying);
continue;
}
if (sc->sc_flags & GJF_DEVICE_DESTROY) {
GJ_DEBUG(1, "Shutting down worker "
"thread for %s.", gp->name);
sc->sc_worker = NULL;
wakeup(&sc->sc_worker);
mtx_unlock(&sc->sc_mtx);
kproc_exit(0);
}
sleep:
g_journal_wait(sc, last_write);
continue;
}
/*
* If we're in switch process, we need to delay all new
* write requests until its done.
*/
if ((sc->sc_flags & GJF_DEVICE_SWITCH) &&
type == GJ_BIO_REGULAR && bp->bio_cmd == BIO_WRITE) {
GJ_LOGREQ(2, bp, "WRITE on SWITCH");
goto try_switch;
}
if (type == GJ_BIO_REGULAR)
bioq_remove(&sc->sc_regular_queue, bp);
else
bioq_remove(&sc->sc_back_queue, bp);
mtx_unlock(&sc->sc_mtx);
switch (type) {
case GJ_BIO_REGULAR:
/* Regular request. */
switch (bp->bio_cmd) {
case BIO_READ:
g_journal_read(sc, bp, bp->bio_offset,
bp->bio_offset + bp->bio_length);
break;
case BIO_WRITE:
last_write = time_second;
g_journal_add_request(sc, bp);
g_journal_flush_send(sc);
break;
default:
panic("Invalid bio_cmd (%d).", bp->bio_cmd);
}
break;
case GJ_BIO_COPY:
switch (bp->bio_cmd) {
case BIO_READ:
if (g_journal_copy_read_done(bp))
g_journal_copy_send(sc);
break;
case BIO_WRITE:
g_journal_copy_write_done(bp);
g_journal_copy_send(sc);
break;
default:
panic("Invalid bio_cmd (%d).", bp->bio_cmd);
}
break;
case GJ_BIO_JOURNAL:
g_journal_flush_done(bp);
g_journal_flush_send(sc);
break;
case GJ_BIO_READ:
default:
panic("Invalid bio (%d).", type);
}
}
}
static void
g_journal_destroy_event(void *arg, int flags __unused)
{
struct g_journal_softc *sc;
g_topology_assert();
sc = arg;
g_journal_destroy(sc);
}
static void
g_journal_timeout(void *arg)
{
struct g_journal_softc *sc;
sc = arg;
GJ_DEBUG(0, "Timeout. Journal %s cannot be completed.",
sc->sc_geom->name);
g_post_event(g_journal_destroy_event, sc, M_NOWAIT, NULL);
}
static struct g_geom *
g_journal_create(struct g_class *mp, struct g_provider *pp,
const struct g_journal_metadata *md)
{
struct g_journal_softc *sc;
struct g_geom *gp;
struct g_consumer *cp;
int error;
sc = NULL; /* gcc */
g_topology_assert();
/*
* There are two possibilities:
* 1. Data and both journals are on the same provider.
* 2. Data and journals are all on separated providers.
*/
/* Look for journal device with the same ID. */
LIST_FOREACH(gp, &mp->geom, geom) {
sc = gp->softc;
if (sc == NULL)
continue;
if (sc->sc_id == md->md_id)
break;
}
if (gp == NULL)
sc = NULL;
else if (sc != NULL && (sc->sc_type & md->md_type) != 0) {
GJ_DEBUG(1, "Journal device %u already configured.", sc->sc_id);
return (NULL);
}
if (md->md_type == 0 || (md->md_type & ~GJ_TYPE_COMPLETE) != 0) {
GJ_DEBUG(0, "Invalid type on %s.", pp->name);
return (NULL);
}
if (md->md_type & GJ_TYPE_DATA) {
GJ_DEBUG(0, "Journal %u: %s contains data.", md->md_id,
pp->name);
}
if (md->md_type & GJ_TYPE_JOURNAL) {
GJ_DEBUG(0, "Journal %u: %s contains journal.", md->md_id,
pp->name);
}
if (sc == NULL) {
/* Action geom. */
sc = malloc(sizeof(*sc), M_JOURNAL, M_WAITOK | M_ZERO);
sc->sc_id = md->md_id;
sc->sc_type = 0;
sc->sc_flags = 0;
sc->sc_worker = NULL;
gp = g_new_geomf(mp, "gjournal %u", sc->sc_id);
gp->start = g_journal_start;
gp->orphan = g_journal_orphan;
gp->access = g_journal_access;
gp->softc = sc;
gp->flags |= G_GEOM_VOLATILE_BIO;
sc->sc_geom = gp;
mtx_init(&sc->sc_mtx, "gjournal", NULL, MTX_DEF);
bioq_init(&sc->sc_back_queue);
bioq_init(&sc->sc_regular_queue);
bioq_init(&sc->sc_delayed_queue);
sc->sc_delayed_count = 0;
sc->sc_current_queue = NULL;
sc->sc_current_count = 0;
sc->sc_flush_queue = NULL;
sc->sc_flush_count = 0;
sc->sc_flush_in_progress = 0;
sc->sc_copy_queue = NULL;
sc->sc_copy_in_progress = 0;
sc->sc_inactive.jj_queue = NULL;
sc->sc_active.jj_queue = NULL;
sc->sc_rootmount = root_mount_hold("GJOURNAL");
GJ_DEBUG(1, "root_mount_hold %p", sc->sc_rootmount);
callout_init(&sc->sc_callout, 1);
if (md->md_type != GJ_TYPE_COMPLETE) {
/*
* Journal and data are on separate providers.
* At this point we have only one of them.
* We setup a timeout in case the other part will not
* appear, so we won't wait forever.
*/
callout_reset(&sc->sc_callout, 5 * hz,
g_journal_timeout, sc);
}
}
/* Remember type of the data provider. */
if (md->md_type & GJ_TYPE_DATA)
sc->sc_orig_type = md->md_type;
sc->sc_type |= md->md_type;
cp = NULL;
if (md->md_type & GJ_TYPE_DATA) {
if (md->md_flags & GJ_FLAG_CLEAN)
sc->sc_flags |= GJF_DEVICE_CLEAN;
if (md->md_flags & GJ_FLAG_CHECKSUM)
sc->sc_flags |= GJF_DEVICE_CHECKSUM;
cp = g_new_consumer(gp);
error = g_attach(cp, pp);
KASSERT(error == 0, ("Cannot attach to %s (error=%d).",
pp->name, error));
error = g_access(cp, 1, 1, 1);
if (error != 0) {
GJ_DEBUG(0, "Cannot access %s (error=%d).", pp->name,
error);
g_journal_destroy(sc);
return (NULL);
}
sc->sc_dconsumer = cp;
sc->sc_mediasize = pp->mediasize - pp->sectorsize;
sc->sc_sectorsize = pp->sectorsize;
sc->sc_jstart = md->md_jstart;
sc->sc_jend = md->md_jend;
if (md->md_provider[0] != '\0')
sc->sc_flags |= GJF_DEVICE_HARDCODED;
sc->sc_journal_offset = md->md_joffset;
sc->sc_journal_id = md->md_jid;
sc->sc_journal_previous_id = md->md_jid;
}
if (md->md_type & GJ_TYPE_JOURNAL) {
if (cp == NULL) {
cp = g_new_consumer(gp);
error = g_attach(cp, pp);
KASSERT(error == 0, ("Cannot attach to %s (error=%d).",
pp->name, error));
error = g_access(cp, 1, 1, 1);
if (error != 0) {
GJ_DEBUG(0, "Cannot access %s (error=%d).",
pp->name, error);
g_journal_destroy(sc);
return (NULL);
}
} else {
/*
* Journal is on the same provider as data, which means
* that data provider ends where journal starts.
*/
sc->sc_mediasize = md->md_jstart;
}
sc->sc_jconsumer = cp;
}
/* Start switcher kproc if needed. */
if (g_journal_switcher_proc == NULL)
g_journal_start_switcher(mp);
if ((sc->sc_type & GJ_TYPE_COMPLETE) != GJ_TYPE_COMPLETE) {
/* Journal is not complete yet. */
return (gp);
} else {
/* Journal complete, cancel timeout. */
callout_drain(&sc->sc_callout);
}
error = kproc_create(g_journal_worker, sc, &sc->sc_worker, 0, 0,
"g_journal %s", sc->sc_name);
if (error != 0) {
GJ_DEBUG(0, "Cannot create worker thread for %s.journal.",
sc->sc_name);
g_journal_destroy(sc);
return (NULL);
}
return (gp);
}
static void
g_journal_destroy_consumer(void *arg, int flags __unused)
{
struct g_consumer *cp;
g_topology_assert();
cp = arg;
g_detach(cp);
g_destroy_consumer(cp);
}
static int
g_journal_destroy(struct g_journal_softc *sc)
{
struct g_geom *gp;
struct g_provider *pp;
struct g_consumer *cp;
g_topology_assert();
if (sc == NULL)
return (ENXIO);
gp = sc->sc_geom;
pp = LIST_FIRST(&gp->provider);
if (pp != NULL) {
if (pp->acr != 0 || pp->acw != 0 || pp->ace != 0) {
GJ_DEBUG(1, "Device %s is still open (r%dw%de%d).",
pp->name, pp->acr, pp->acw, pp->ace);
return (EBUSY);
}
g_error_provider(pp, ENXIO);
g_journal_flush(sc);
g_journal_flush_send(sc);
g_journal_switch(sc);
}
sc->sc_flags |= (GJF_DEVICE_DESTROY | GJF_DEVICE_CLEAN);
g_topology_unlock();
if (sc->sc_rootmount != NULL) {
GJ_DEBUG(1, "root_mount_rel %p", sc->sc_rootmount);
root_mount_rel(sc->sc_rootmount);
sc->sc_rootmount = NULL;
}
callout_drain(&sc->sc_callout);
mtx_lock(&sc->sc_mtx);
wakeup(sc);
while (sc->sc_worker != NULL)
msleep(&sc->sc_worker, &sc->sc_mtx, PRIBIO, "gj:destroy", 0);
mtx_unlock(&sc->sc_mtx);
if (pp != NULL) {
GJ_DEBUG(1, "Marking %s as clean.", sc->sc_name);
g_journal_metadata_update(sc);
g_topology_lock();
g_wither_provider(pp, ENXIO);
} else {
g_topology_lock();
}
mtx_destroy(&sc->sc_mtx);
if (sc->sc_current_count != 0) {
GJ_DEBUG(0, "Warning! Number of current requests %d.",
sc->sc_current_count);
}
gp->softc = NULL;
LIST_FOREACH(cp, &gp->consumer, consumer) {
if (cp->acr + cp->acw + cp->ace > 0)
g_access(cp, -1, -1, -1);
/*
* We keep all consumers open for writting, so if I'll detach
* and destroy consumer here, I'll get providers for taste, so
* journal will be started again.
* Sending an event here, prevents this from happening.
*/
g_post_event(g_journal_destroy_consumer, cp, M_WAITOK, NULL);
}
g_wither_geom(gp, ENXIO);
free(sc, M_JOURNAL);
return (0);
}
static void
g_journal_taste_orphan(struct g_consumer *cp)
{
KASSERT(1 == 0, ("%s called while tasting %s.", __func__,
cp->provider->name));
}
static struct g_geom *
g_journal_taste(struct g_class *mp, struct g_provider *pp, int flags __unused)
{
struct g_journal_metadata md;
struct g_consumer *cp;
struct g_geom *gp;
int error;
g_topology_assert();
g_trace(G_T_TOPOLOGY, "%s(%s, %s)", __func__, mp->name, pp->name);
GJ_DEBUG(2, "Tasting %s.", pp->name);
if (pp->geom->class == mp)
return (NULL);
gp = g_new_geomf(mp, "journal:taste");
/* This orphan function should be never called. */
gp->orphan = g_journal_taste_orphan;
cp = g_new_consumer(gp);
g_attach(cp, pp);
error = g_journal_metadata_read(cp, &md);
g_detach(cp);
g_destroy_consumer(cp);
g_destroy_geom(gp);
if (error != 0)
return (NULL);
gp = NULL;
if (md.md_provider[0] != '\0' &&
!g_compare_names(md.md_provider, pp->name))
return (NULL);
if (md.md_provsize != 0 && md.md_provsize != pp->mediasize)
return (NULL);
if (g_journal_debug >= 2)
journal_metadata_dump(&md);
gp = g_journal_create(mp, pp, &md);
return (gp);
}
static struct g_journal_softc *
g_journal_find_device(struct g_class *mp, const char *name)
{
struct g_journal_softc *sc;
struct g_geom *gp;
struct g_provider *pp;
if (strncmp(name, "/dev/", 5) == 0)
name += 5;
LIST_FOREACH(gp, &mp->geom, geom) {
sc = gp->softc;
if (sc == NULL)
continue;
if (sc->sc_flags & GJF_DEVICE_DESTROY)
continue;
if ((sc->sc_type & GJ_TYPE_COMPLETE) != GJ_TYPE_COMPLETE)
continue;
pp = LIST_FIRST(&gp->provider);
if (strcmp(sc->sc_name, name) == 0)
return (sc);
if (pp != NULL && strcmp(pp->name, name) == 0)
return (sc);
}
return (NULL);
}
static void
g_journal_ctl_destroy(struct gctl_req *req, struct g_class *mp)
{
struct g_journal_softc *sc;
const char *name;
char param[16];
int *nargs;
int error, i;
g_topology_assert();
nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs));
if (nargs == NULL) {
gctl_error(req, "No '%s' argument.", "nargs");
return;
}
if (*nargs <= 0) {
gctl_error(req, "Missing device(s).");
return;
}
for (i = 0; i < *nargs; i++) {
snprintf(param, sizeof(param), "arg%d", i);
name = gctl_get_asciiparam(req, param);
if (name == NULL) {
gctl_error(req, "No 'arg%d' argument.", i);
return;
}
sc = g_journal_find_device(mp, name);
if (sc == NULL) {
gctl_error(req, "No such device: %s.", name);
return;
}
error = g_journal_destroy(sc);
if (error != 0) {
gctl_error(req, "Cannot destroy device %s (error=%d).",
LIST_FIRST(&sc->sc_geom->provider)->name, error);
return;
}
}
}
static void
g_journal_ctl_sync(struct gctl_req *req __unused, struct g_class *mp __unused)
{
g_topology_assert();
g_topology_unlock();
g_journal_sync_requested++;
wakeup(&g_journal_switcher_state);
while (g_journal_sync_requested > 0)
tsleep(&g_journal_sync_requested, PRIBIO, "j:sreq", hz / 2);
g_topology_lock();
}
static void
g_journal_config(struct gctl_req *req, struct g_class *mp, const char *verb)
{
uint32_t *version;
g_topology_assert();
version = gctl_get_paraml(req, "version", sizeof(*version));
if (version == NULL) {
gctl_error(req, "No '%s' argument.", "version");
return;
}
if (*version != G_JOURNAL_VERSION) {
gctl_error(req, "Userland and kernel parts are out of sync.");
return;
}
if (strcmp(verb, "destroy") == 0 || strcmp(verb, "stop") == 0) {
g_journal_ctl_destroy(req, mp);
return;
} else if (strcmp(verb, "sync") == 0) {
g_journal_ctl_sync(req, mp);
return;
}
gctl_error(req, "Unknown verb.");
}
static void
g_journal_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp,
struct g_consumer *cp, struct g_provider *pp)
{
struct g_journal_softc *sc;
g_topology_assert();
sc = gp->softc;
if (sc == NULL)
return;
if (pp != NULL) {
/* Nothing here. */
} else if (cp != NULL) {
int first = 1;
sbuf_printf(sb, "%s<Role>", indent);
if (cp == sc->sc_dconsumer) {
sbuf_printf(sb, "Data");
first = 0;
}
if (cp == sc->sc_jconsumer) {
if (!first)
sbuf_printf(sb, ",");
sbuf_printf(sb, "Journal");
}
sbuf_printf(sb, "</Role>\n");
if (cp == sc->sc_jconsumer) {
sbuf_printf(sb, "<Jstart>%jd</Jstart>\n",
(intmax_t)sc->sc_jstart);
sbuf_printf(sb, "<Jend>%jd</Jend>\n",
(intmax_t)sc->sc_jend);
}
} else {
sbuf_printf(sb, "%s<ID>%u</ID>\n", indent, (u_int)sc->sc_id);
}
}
static eventhandler_tag g_journal_event_shutdown = NULL;
static eventhandler_tag g_journal_event_lowmem = NULL;
static void
g_journal_shutdown(void *arg, int howto __unused)
{
struct g_class *mp;
struct g_geom *gp, *gp2;
if (panicstr != NULL)
return;
mp = arg;
g_topology_lock();
LIST_FOREACH_SAFE(gp, &mp->geom, geom, gp2) {
if (gp->softc == NULL)
continue;
GJ_DEBUG(0, "Shutting down geom %s.", gp->name);
g_journal_destroy(gp->softc);
}
g_topology_unlock();
}
/*
* Free cached requests from inactive queue in case of low memory.
* We free GJ_FREE_AT_ONCE elements at once.
*/
#define GJ_FREE_AT_ONCE 4
static void
g_journal_lowmem(void *arg, int howto __unused)
{
struct g_journal_softc *sc;
struct g_class *mp;
struct g_geom *gp;
struct bio *bp;
u_int nfree = GJ_FREE_AT_ONCE;
g_journal_stats_low_mem++;
mp = arg;
g_topology_lock();
LIST_FOREACH(gp, &mp->geom, geom) {
sc = gp->softc;
if (sc == NULL || (sc->sc_flags & GJF_DEVICE_DESTROY))
continue;
mtx_lock(&sc->sc_mtx);
for (bp = sc->sc_inactive.jj_queue; nfree > 0 && bp != NULL;
nfree--, bp = bp->bio_next) {
/*
* This is safe to free the bio_data, because:
* 1. If bio_data is NULL it will be read from the
* inactive journal.
* 2. If bp is sent down, it is first removed from the
* inactive queue, so it's impossible to free the
* data from under in-flight bio.
* On the other hand, freeing elements from the active
* queue, is not safe.
*/
if (bp->bio_data != NULL) {
GJ_DEBUG(2, "Freeing data from %s.",
sc->sc_name);
gj_free(bp->bio_data, bp->bio_length);
bp->bio_data = NULL;
}
}
mtx_unlock(&sc->sc_mtx);
if (nfree == 0)
break;
}
g_topology_unlock();
}
static void g_journal_switcher(void *arg);
static void
g_journal_init(struct g_class *mp)
{
/* Pick a conservative value if provided value sucks. */
if (g_journal_cache_divisor <= 0 ||
(vm_kmem_size / g_journal_cache_divisor == 0)) {
g_journal_cache_divisor = 5;
}
if (g_journal_cache_limit > 0) {
g_journal_cache_limit = vm_kmem_size / g_journal_cache_divisor;
g_journal_cache_low =
(g_journal_cache_limit / 100) * g_journal_cache_switch;
}
g_journal_event_shutdown = EVENTHANDLER_REGISTER(shutdown_post_sync,
g_journal_shutdown, mp, EVENTHANDLER_PRI_FIRST);
if (g_journal_event_shutdown == NULL)
GJ_DEBUG(0, "Warning! Cannot register shutdown event.");
g_journal_event_lowmem = EVENTHANDLER_REGISTER(vm_lowmem,
g_journal_lowmem, mp, EVENTHANDLER_PRI_FIRST);
if (g_journal_event_lowmem == NULL)
GJ_DEBUG(0, "Warning! Cannot register lowmem event.");
}
static void
g_journal_fini(struct g_class *mp)
{
if (g_journal_event_shutdown != NULL) {
EVENTHANDLER_DEREGISTER(shutdown_post_sync,
g_journal_event_shutdown);
}
if (g_journal_event_lowmem != NULL)
EVENTHANDLER_DEREGISTER(vm_lowmem, g_journal_event_lowmem);
g_journal_stop_switcher();
}
DECLARE_GEOM_CLASS(g_journal_class, g_journal);
static const struct g_journal_desc *
g_journal_find_desc(const char *fstype)
{
const struct g_journal_desc *desc;
int i;
for (desc = g_journal_filesystems[i = 0]; desc != NULL;
desc = g_journal_filesystems[++i]) {
if (strcmp(desc->jd_fstype, fstype) == 0)
break;
}
return (desc);
}
static void
g_journal_switch_wait(struct g_journal_softc *sc)
{
struct bintime bt;
mtx_assert(&sc->sc_mtx, MA_OWNED);
if (g_journal_debug >= 2) {
if (sc->sc_flush_in_progress > 0) {
GJ_DEBUG(2, "%d requests flushing.",
sc->sc_flush_in_progress);
}
if (sc->sc_copy_in_progress > 0) {
GJ_DEBUG(2, "%d requests copying.",
sc->sc_copy_in_progress);
}
if (sc->sc_flush_count > 0) {
GJ_DEBUG(2, "%d requests to flush.",
sc->sc_flush_count);
}
if (sc->sc_delayed_count > 0) {
GJ_DEBUG(2, "%d requests delayed.",
sc->sc_delayed_count);
}
}
g_journal_stats_switches++;
if (sc->sc_copy_in_progress > 0)
g_journal_stats_wait_for_copy++;
GJ_TIMER_START(1, &bt);
sc->sc_flags &= ~GJF_DEVICE_BEFORE_SWITCH;
sc->sc_flags |= GJF_DEVICE_SWITCH;
wakeup(sc);
while (sc->sc_flags & GJF_DEVICE_SWITCH) {
msleep(&sc->sc_journal_copying, &sc->sc_mtx, PRIBIO,
"gj:switch", 0);
}
GJ_TIMER_STOP(1, &bt, "Switch time of %s", sc->sc_name);
}
static void
g_journal_do_switch(struct g_class *classp)
{
struct g_journal_softc *sc;
const struct g_journal_desc *desc;
struct g_geom *gp;
struct mount *mp;
struct bintime bt;
char *mountpoint;
int error, save;
g_topology_lock();
LIST_FOREACH(gp, &classp->geom, geom) {
sc = gp->softc;
if (sc == NULL)
continue;
if (sc->sc_flags & GJF_DEVICE_DESTROY)
continue;
if ((sc->sc_type & GJ_TYPE_COMPLETE) != GJ_TYPE_COMPLETE)
continue;
mtx_lock(&sc->sc_mtx);
sc->sc_flags |= GJF_DEVICE_BEFORE_SWITCH;
mtx_unlock(&sc->sc_mtx);
}
g_topology_unlock();
mtx_lock(&mountlist_mtx);
TAILQ_FOREACH(mp, &mountlist, mnt_list) {
if (mp->mnt_gjprovider == NULL)
continue;
if (mp->mnt_flag & MNT_RDONLY)
continue;
desc = g_journal_find_desc(mp->mnt_stat.f_fstypename);
if (desc == NULL)
continue;
if (vfs_busy(mp, MBF_NOWAIT | MBF_MNTLSTLOCK))
continue;
/* mtx_unlock(&mountlist_mtx) was done inside vfs_busy() */
g_topology_lock();
sc = g_journal_find_device(classp, mp->mnt_gjprovider);
g_topology_unlock();
if (sc == NULL) {
GJ_DEBUG(0, "Cannot find journal geom for %s.",
mp->mnt_gjprovider);
goto next;
} else if (JEMPTY(sc)) {
mtx_lock(&sc->sc_mtx);
sc->sc_flags &= ~GJF_DEVICE_BEFORE_SWITCH;
mtx_unlock(&sc->sc_mtx);
GJ_DEBUG(3, "No need for %s switch.", sc->sc_name);
goto next;
}
mountpoint = mp->mnt_stat.f_mntonname;
error = vn_start_write(NULL, &mp, V_WAIT);
if (error != 0) {
GJ_DEBUG(0, "vn_start_write(%s) failed (error=%d).",
mountpoint, error);
goto next;
}
save = curthread_pflags_set(TDP_SYNCIO);
GJ_TIMER_START(1, &bt);
vfs_msync(mp, MNT_NOWAIT);
GJ_TIMER_STOP(1, &bt, "Msync time of %s", mountpoint);
GJ_TIMER_START(1, &bt);
error = VFS_SYNC(mp, MNT_NOWAIT);
if (error == 0)
GJ_TIMER_STOP(1, &bt, "Sync time of %s", mountpoint);
else {
GJ_DEBUG(0, "Cannot sync file system %s (error=%d).",
mountpoint, error);
}
curthread_pflags_restore(save);
vn_finished_write(mp);
if (error != 0)
goto next;
/*
* Send BIO_FLUSH before freezing the file system, so it can be
* faster after the freeze.
*/
GJ_TIMER_START(1, &bt);
g_journal_flush_cache(sc);
GJ_TIMER_STOP(1, &bt, "BIO_FLUSH time of %s", sc->sc_name);
GJ_TIMER_START(1, &bt);
error = vfs_write_suspend(mp, VS_SKIP_UNMOUNT);
GJ_TIMER_STOP(1, &bt, "Suspend time of %s", mountpoint);
if (error != 0) {
GJ_DEBUG(0, "Cannot suspend file system %s (error=%d).",
mountpoint, error);
goto next;
}
error = desc->jd_clean(mp);
if (error != 0)
goto next;
mtx_lock(&sc->sc_mtx);
g_journal_switch_wait(sc);
mtx_unlock(&sc->sc_mtx);
vfs_write_resume(mp, 0);
next:
mtx_lock(&mountlist_mtx);
vfs_unbusy(mp);
}
mtx_unlock(&mountlist_mtx);
sc = NULL;
for (;;) {
g_topology_lock();
LIST_FOREACH(gp, &g_journal_class.geom, geom) {
sc = gp->softc;
if (sc == NULL)
continue;
mtx_lock(&sc->sc_mtx);
if ((sc->sc_type & GJ_TYPE_COMPLETE) == GJ_TYPE_COMPLETE &&
!(sc->sc_flags & GJF_DEVICE_DESTROY) &&
(sc->sc_flags & GJF_DEVICE_BEFORE_SWITCH)) {
break;
}
mtx_unlock(&sc->sc_mtx);
sc = NULL;
}
g_topology_unlock();
if (sc == NULL)
break;
mtx_assert(&sc->sc_mtx, MA_OWNED);
g_journal_switch_wait(sc);
mtx_unlock(&sc->sc_mtx);
}
}
static void
g_journal_start_switcher(struct g_class *mp)
{
int error;
g_topology_assert();
MPASS(g_journal_switcher_proc == NULL);
g_journal_switcher_state = GJ_SWITCHER_WORKING;
error = kproc_create(g_journal_switcher, mp, &g_journal_switcher_proc,
0, 0, "g_journal switcher");
KASSERT(error == 0, ("Cannot create switcher thread."));
}
static void
g_journal_stop_switcher(void)
{
g_topology_assert();
MPASS(g_journal_switcher_proc != NULL);
g_journal_switcher_state = GJ_SWITCHER_DIE;
wakeup(&g_journal_switcher_state);
while (g_journal_switcher_state != GJ_SWITCHER_DIED)
tsleep(&g_journal_switcher_state, PRIBIO, "jfini:wait", hz / 5);
GJ_DEBUG(1, "Switcher died.");
g_journal_switcher_proc = NULL;
}
/*
* TODO: Kill switcher thread on last geom destruction?
*/
static void
g_journal_switcher(void *arg)
{
struct g_class *mp;
struct bintime bt;
int error;
mp = arg;
curthread->td_pflags |= TDP_NORUNNINGBUF;
for (;;) {
g_journal_switcher_wokenup = 0;
error = tsleep(&g_journal_switcher_state, PRIBIO, "jsw:wait",
g_journal_switch_time * hz);
if (g_journal_switcher_state == GJ_SWITCHER_DIE) {
g_journal_switcher_state = GJ_SWITCHER_DIED;
GJ_DEBUG(1, "Switcher exiting.");
wakeup(&g_journal_switcher_state);
kproc_exit(0);
}
if (error == 0 && g_journal_sync_requested == 0) {
GJ_DEBUG(1, "Out of cache, force switch (used=%jd "
"limit=%jd).", (intmax_t)g_journal_cache_used,
(intmax_t)g_journal_cache_limit);
}
GJ_TIMER_START(1, &bt);
g_journal_do_switch(mp);
GJ_TIMER_STOP(1, &bt, "Entire switch time");
if (g_journal_sync_requested > 0) {
g_journal_sync_requested = 0;
wakeup(&g_journal_sync_requested);
}
}
}
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