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tapdisk-vbd.c
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/*
* Copyright (c) 2016, Citrix Systems, Inc.
*
* 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.
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER
* 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <errno.h>
#include <fcntl.h>
#include <regex.h>
#include <unistd.h>
#include <stdlib.h>
#include <libgen.h>
#include <sys/mman.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include "debug.h"
#include "libvhd.h"
#include "tapdisk-blktap.h"
#include "tapdisk-image.h"
#include "tapdisk-driver.h"
#include "tapdisk-server.h"
#include "tapdisk-vbd.h"
#include "tapdisk-metrics.h"
#include "tapdisk-disktype.h"
#include "tapdisk-interface.h"
#include "tapdisk-stats.h"
#include "tapdisk-storage.h"
#include "tapdisk-nbdserver.h"
#include "td-stats.h"
#include "tapdisk-utils.h"
#define DBG(_level, _f, _a...) tlog_write(_level, _f, ##_a)
#define ERR(_err, _f, _a...) tlog_error(_err, _f, ##_a)
#define INFO(_f, _a...) tlog_syslog(TLOG_INFO, "vbd: " _f, ##_a)
#define ERROR(_f, _a...) tlog_syslog(TLOG_WARN, "vbd: " _f, ##_a)
#define TD_VBD_EIO_RETRIES 10
#define TD_VBD_EIO_SLEEP 1
#define TD_VBD_WATCHDOG_TIMEOUT 10
char* op_strings[TD_OPS_END] ={"read", "write", "block_status"};
static void tapdisk_vbd_complete_vbd_request(td_vbd_t *, td_vbd_request_t *);
static int tapdisk_vbd_queue_ready(td_vbd_t *);
static void tapdisk_vbd_check_queue_state(td_vbd_t *);
static bool log=true;
/*
* initialization
*/
static void
tapdisk_vbd_mark_progress(td_vbd_t *vbd)
{
gettimeofday(&vbd->ts, NULL);
}
td_vbd_t*
tapdisk_vbd_create(uint16_t uuid)
{
td_vbd_t *vbd;
vbd = calloc(1, sizeof(td_vbd_t));
if (!vbd) {
EPRINTF("failed to allocate tapdisk state\n");
return NULL;
}
shm_init(&vbd->rrd.shm);
vbd->uuid = uuid;
vbd->req_timeout = TD_VBD_REQUEST_TIMEOUT;
vbd->watchdog_warned = false;
INIT_LIST_HEAD(&vbd->images);
INIT_LIST_HEAD(&vbd->new_requests);
INIT_LIST_HEAD(&vbd->pending_requests);
INIT_LIST_HEAD(&vbd->failed_requests);
INIT_LIST_HEAD(&vbd->completed_requests);
INIT_LIST_HEAD(&vbd->next);
INIT_LIST_HEAD(&vbd->rings);
INIT_LIST_HEAD(&vbd->dead_rings);
tapdisk_vbd_mark_progress(vbd);
return vbd;
}
int
tapdisk_vbd_initialize(int rfd, int wfd, uint16_t uuid)
{
td_vbd_t *vbd;
vbd = tapdisk_server_get_vbd(uuid);
if (vbd) {
EPRINTF("duplicate vbds! %u\n", uuid);
return -EEXIST;
}
vbd = tapdisk_vbd_create(uuid);
if (!vbd) {
EPRINTF("failed to create vbd\n");
return -ENOMEM;
}
tapdisk_server_add_vbd(vbd);
return 0;
}
static inline void
tapdisk_vbd_add_image(td_vbd_t *vbd, td_image_t *image)
{
list_add_tail(&image->next, &vbd->images);
}
static inline int
tapdisk_vbd_is_last_image(td_vbd_t *vbd, td_image_t *image)
{
return list_is_last(&image->next, &vbd->images);
}
static inline td_image_t *
tapdisk_vbd_first_image(td_vbd_t *vbd)
{
td_image_t *image = NULL;
if (!list_empty(&vbd->images))
image = list_entry(vbd->images.next, td_image_t, next);
return image;
}
static inline td_image_t *
tapdisk_vbd_last_image(td_vbd_t *vbd)
{
td_image_t *image = NULL;
if (!list_empty(&vbd->images))
image = list_entry(vbd->images.prev, td_image_t, next);
return image;
}
static inline td_image_t *
tapdisk_vbd_next_image(td_image_t *image)
{
return list_entry(image->next.next, td_image_t, next);
}
static int
tapdisk_vbd_validate_chain(td_vbd_t *vbd)
{
return tapdisk_image_validate_chain(&vbd->images);
}
static int
vbd_stats_destroy(td_vbd_t *vbd) {
int err = 0;
ASSERT(vbd);
err = shm_destroy(&vbd->rrd.shm);
if (unlikely(err)) {
EPRINTF("failed to destroy RRD file: %s\n", strerror(err));
goto out;
}
free(vbd->rrd.shm.path);
vbd->rrd.shm.path = NULL;
out:
return -err;
}
static int
vbd_stats_create(td_vbd_t *vbd) {
int err;
ASSERT(vbd);
err = mkdir("/dev/shm/metrics", S_IRUSR | S_IWUSR);
if (likely(err)) {
err = errno;
if (unlikely(err != EEXIST))
goto out;
else
err = 0;
}
/*
* FIXME Rename this to something like "vbd3-domid-devid". Consider
* consolidating this with the io_ring shared memory file. Check if blkback
* exports the same information in some sysfs file and if so move this to
* the ring location.
*/
err = asprintf(&vbd->rrd.shm.path, "/dev/shm/metrics/tap-%d-%d", getpid(),
vbd->uuid);
if (err == -1) {
err = errno;
vbd->rrd.shm.path = NULL;
EPRINTF("failed to create metric file: %s\n", strerror(err));
goto out;
}
err = 0;
vbd->rrd.shm.size = PAGE_SIZE;
err = shm_create(&vbd->rrd.shm);
if (err)
EPRINTF("failed to create RRD: %s\n", strerror(err));
out:
if (err) {
int err2 = vbd_stats_destroy(vbd);
if (err2)
EPRINTF("failed to clean up failed RRD shared memory creation: "
"%s (error ignored)\n", strerror(-err2));
}
return -err;
}
void
tapdisk_vbd_close_vdi(td_vbd_t *vbd)
{
int err;
err = vbd_stats_destroy(vbd);
if (err) {
EPRINTF("failed to destroy RRD stats file: %s (error ignored)\n",
strerror(-err));
}
err = td_metrics_vdi_stop(&vbd->vdi_stats);
if (err) {
EPRINTF("failed to destroy stats file: %s\n", strerror(-err));
}
tapdisk_image_close_chain(&vbd->images);
if (vbd->secondary &&
vbd->secondary_mode != TD_VBD_SECONDARY_MIRROR) {
tapdisk_image_close(vbd->secondary);
vbd->secondary = NULL;
}
if (vbd->retired) {
tapdisk_image_close(vbd->retired);
vbd->retired = NULL;
}
td_flag_set(vbd->state, TD_VBD_CLOSED);
}
static int
tapdisk_vbd_add_block_cache(td_vbd_t *vbd)
{
td_image_t *cache, *image, *target, *tmp;
int err;
target = NULL;
tapdisk_vbd_for_each_image(vbd, image, tmp)
if (td_flag_test(image->flags, TD_OPEN_RDONLY) &&
td_flag_test(image->flags, TD_OPEN_SHAREABLE)) {
target = image;
break;
}
if (!target)
return 0;
cache = tapdisk_image_allocate(target->name,
DISK_TYPE_BLOCK_CACHE,
target->flags);
if (!cache)
return -ENOMEM;
/* try to load existing cache */
err = td_load(cache);
if (!err)
goto done;
/* hack driver to send open() correct image size */
if (!target->driver) {
err = -ENODEV;
goto fail;
}
cache->driver = tapdisk_driver_allocate(cache->type,
cache->name,
cache->flags);
if (!cache->driver) {
err = -ENOMEM;
goto fail;
}
cache->driver->info = target->driver->info;
/* try to open new cache */
err = td_open(cache, &vbd->encryption);
if (!err)
goto done;
fail:
/* give up */
tapdisk_image_free(target);
tapdisk_image_free(cache);
return err;
done:
/* insert cache before image */
list_add(&cache->next, target->next.prev);
return 0;
}
static int
tapdisk_vbd_add_local_cache(td_vbd_t *vbd)
{
td_image_t *cache, *parent;
int err;
parent = tapdisk_vbd_first_image(vbd);
if (tapdisk_vbd_is_last_image(vbd, parent)) {
DPRINTF("Single-image chain, nothing to cache");
return 0;
}
cache = tapdisk_image_allocate(parent->name,
DISK_TYPE_LCACHE,
parent->flags);
if (!cache)
return -ENOMEM;
/* try to load existing cache */
err = td_load(cache);
if (!err)
goto done;
cache->driver = tapdisk_driver_allocate(cache->type,
cache->name,
cache->flags);
if (!cache->driver) {
err = -ENOMEM;
goto fail;
}
cache->driver->info = parent->driver->info;
/* try to open new cache */
err = td_open(cache, &vbd->encryption);
if (!err)
goto done;
fail:
tapdisk_image_free(cache);
return err;
done:
/* insert cache right above leaf image */
list_add(&cache->next, &parent->next);
DPRINTF("Added local_cache driver\n");
return 0;
}
int
tapdisk_vbd_add_secondary(td_vbd_t *vbd)
{
td_image_t *leaf, *second = NULL;
const char *path;
int type, err;
if (strcmp(vbd->secondary_name, "null") == 0) {
DPRINTF("Removing secondary image\n");
vbd->secondary_mode = TD_VBD_SECONDARY_DISABLED;
vbd->secondary = NULL;
vbd->nbd_mirror_failed = 0;
return 0;
}
DPRINTF("Adding secondary image: %s\n", vbd->secondary_name);
type = tapdisk_disktype_parse_params(vbd->secondary_name, &path);
if (type < 0)
return type;
leaf = tapdisk_vbd_first_image(vbd);
if (!leaf) {
err = -EINVAL;
goto fail;
}
err = tapdisk_image_open(type, path, leaf->flags, &vbd->encryption, &second);
if (err) {
if (type == DISK_TYPE_NBD)
vbd->nbd_mirror_failed = 1;
vbd->secondary=NULL;
vbd->secondary_mode=TD_VBD_SECONDARY_DISABLED;
goto fail;
}
if (second->info.size != leaf->info.size) {
EPRINTF("Secondary image size %"PRIu64" != image size %"PRIu64"\n",
second->info.size, leaf->info.size);
err = -EINVAL;
goto fail;
}
vbd->secondary = second;
leaf->flags |= TD_IGNORE_ENOSPC;
if (td_flag_test(vbd->flags, TD_OPEN_STANDBY)) {
DPRINTF("In standby mode\n");
vbd->secondary_mode = TD_VBD_SECONDARY_STANDBY;
} else {
DPRINTF("In mirror mode\n");
vbd->secondary_mode = TD_VBD_SECONDARY_MIRROR;
/*
* we actually need this image to also be part of the chain,
* since it may already contain data
*/
list_add(&second->next, &leaf->next);
}
DPRINTF("Added secondary image\n");
return 0;
fail:
if (second)
tapdisk_image_close(second);
return err;
}
static void signal_enospc(td_vbd_t *vbd)
{
int fd, err;
char *fn;
err = asprintf(&fn, BLKTAP2_ENOSPC_SIGNAL_FILE"%d", vbd->tap->minor);
if (err == -1) {
EPRINTF("Failed to signal ENOSPC condition\n");
return;
}
fd = open(fn, O_WRONLY | O_CREAT | O_NONBLOCK, 0666);
if (fd == -1)
EPRINTF("Failed to open file to signal ENOSPC condition\n");
else
close(fd);
free(fn);
}
#if 0
static int
tapdisk_vbd_open_index(td_vbd_t *vbd)
{
int err;
char *path;
td_flag_t flags;
td_image_t *last, *image;
last = tapdisk_vbd_last_image(vbd);
err = asprintf(&path, "%s.bat", last->name);
if (err == -1)
return -errno;
err = access(path, R_OK);
if (err == -1) {
free(path);
return -errno;
}
flags = vbd->flags | TD_OPEN_RDONLY | TD_OPEN_SHAREABLE;
image = tapdisk_image_allocate(path, DISK_TYPE_VINDEX, flags);
if (!image) {
err = -ENOMEM;
goto fail;
}
err = td_open(image);
if (err)
goto fail;
tapdisk_vbd_add_image(vbd, image);
return 0;
fail:
if (image)
tapdisk_image_free(image);
free(path);
return err;
}
#endif
static int tapdisk_vbd_add_dirty_log(td_vbd_t *vbd)
{
int err;
td_driver_t *driver;
td_image_t *log, *parent;
driver = NULL;
log = NULL;
DPRINTF("CBT:tapdisk_vbd_add_dirty_log called for %s with log file %s\n",
vbd->name, vbd->logpath);
parent = tapdisk_vbd_first_image(vbd);
DPRINTF("CBT: Size in Image: %"PRIu64" sectors\n", parent->info.size);
log = tapdisk_image_allocate(vbd->logpath,
DISK_TYPE_LOG,
parent->flags);
if (!log)
return -ENOMEM;
driver = tapdisk_driver_allocate(log->type,
log->name,
log->flags);
if (!driver) {
err = -ENOMEM;
goto fail;
}
driver->info = parent->driver->info;
log->driver = driver;
err = td_open(log, &vbd->encryption);
if (err)
goto fail;
/* insert log before image */
list_add(&log->next, parent->next.prev);
return 0;
fail:
tapdisk_image_free(log);
return err;
}
int
tapdisk_vbd_open_vdi(td_vbd_t *vbd, const char *name, td_flag_t flags, int prt_devnum)
{
char *tmp = vbd->name;
int err;
if (!list_empty(&vbd->images)) {
err = -EBUSY;
goto fail;
}
if (!name && !vbd->name) {
err = -EINVAL;
goto fail;
}
if (name) {
vbd->name = strdup(name);
if (!vbd->name) {
err = -errno;
goto fail;
}
}
err = tapdisk_image_open_chain(vbd->name, flags, prt_devnum, &vbd->encryption, &vbd->images);
if (err)
goto fail;
td_flag_clear(vbd->state, TD_VBD_CLOSED);
vbd->flags = flags;
if (td_flag_test(vbd->flags, TD_OPEN_ADD_LOG)) {
if (!vbd->logpath) {
err = -EINVAL;
goto fail;
}
err = tapdisk_vbd_add_dirty_log(vbd);
if (err)
goto fail;
}
if (td_flag_test(vbd->flags, TD_OPEN_ADD_CACHE)) {
err = tapdisk_vbd_add_block_cache(vbd);
if (err)
goto fail;
}
if (td_flag_test(vbd->flags, TD_OPEN_LOCAL_CACHE)) {
err = tapdisk_vbd_add_local_cache(vbd);
if (err)
goto fail;
}
err = tapdisk_vbd_validate_chain(vbd);
if (err)
goto fail;
if (td_flag_test(vbd->flags, TD_OPEN_SECONDARY)) {
err = tapdisk_vbd_add_secondary(vbd);
if (err) {
if (vbd->nbd_mirror_failed != 1)
goto fail;
INFO("Ignoring failed NBD secondary attach\n");
err = 0;
}
}
err = vbd_stats_create(vbd);
if (err)
goto fail;
err = td_metrics_vdi_start(vbd->tap->minor, &vbd->vdi_stats);
if (err)
goto fail;
if (tmp != vbd->name)
free(tmp);
return err;
fail:
if (vbd->name != tmp) {
free(vbd->name);
vbd->name = tmp;
}
if (!list_empty(&vbd->images))
tapdisk_image_close_chain(&vbd->images);
vbd->flags = 0;
return err;
}
void
tapdisk_vbd_detach(td_vbd_t *vbd)
{
td_blktap_t *tap = vbd->tap;
if (tap) {
tapdisk_blktap_close(tap);
vbd->tap = NULL;
}
}
int
tapdisk_vbd_attach(td_vbd_t *vbd, const char *devname, int minor)
{
if (vbd->tap)
return -EALREADY;
return tapdisk_blktap_open(devname, vbd, &vbd->tap);
}
/*
int
tapdisk_vbd_open(td_vbd_t *vbd, const char *name,
int minor, const char *ring, td_flag_t flags)
{
int err;
err = tapdisk_vbd_open_vdi(vbd, name, flags, -1);
if (err)
goto out;
err = tapdisk_vbd_attach(vbd, ring, minor);
if (err)
goto out;
return 0;
out:
tapdisk_vbd_detach(vbd);
tapdisk_vbd_close_vdi(vbd);
free(vbd->name);
vbd->name = NULL;
return err;
}
*/
static void
tapdisk_vbd_queue_count(td_vbd_t *vbd, int *new,
int *pending, int *failed, int *completed)
{
int n, p, f, c;
td_vbd_request_t *vreq, *tvreq;
n = 0;
p = 0;
f = 0;
c = 0;
tapdisk_vbd_for_each_request(vreq, tvreq, &vbd->new_requests)
n++;
tapdisk_vbd_for_each_request(vreq, tvreq, &vbd->pending_requests)
p++;
tapdisk_vbd_for_each_request(vreq, tvreq, &vbd->failed_requests)
f++;
tapdisk_vbd_for_each_request(vreq, tvreq, &vbd->completed_requests)
c++;
*new = n;
*pending = p;
*failed = f;
*completed = c;
}
static int
tapdisk_vbd_shutdown(td_vbd_t *vbd)
{
int new, pending, failed, completed;
if (!list_empty(&vbd->pending_requests))
return -EAGAIN;
tapdisk_vbd_queue_count(vbd, &new, &pending, &failed, &completed);
DPRINTF("%s: state: 0x%08x, new: 0x%02x, pending: 0x%02x, "
"failed: 0x%02x, completed: 0x%02x\n",
vbd->name, vbd->state, new, pending, failed, completed);
DPRINTF("last activity: %010ld.%06ld, errors: 0x%04"PRIx64", "
"retries: 0x%04"PRIx64", received: 0x%08"PRIx64", "
"returned: 0x%08"PRIx64", kicked: 0x%08"PRIx64"\n",
vbd->ts.tv_sec, vbd->ts.tv_usec,
vbd->errors, vbd->retries, vbd->received, vbd->returned,
vbd->kicked);
tapdisk_vbd_close_vdi(vbd);
tapdisk_vbd_detach(vbd);
tapdisk_server_remove_vbd(vbd);
free(vbd->name);
free(vbd);
return 0;
}
int
tapdisk_vbd_close(td_vbd_t *vbd)
{
/*
* don't close if any requests are pending in the aio layer
*/
if (!list_empty(&vbd->pending_requests))
goto fail;
/*
* if the queue is still active and we have more
* requests, try to complete them before closing.
*/
if (tapdisk_vbd_queue_ready(vbd) &&
(!list_empty(&vbd->new_requests) ||
!list_empty(&vbd->failed_requests) ||
!list_empty(&vbd->completed_requests)))
goto fail;
return tapdisk_vbd_shutdown(vbd);
fail:
td_flag_set(vbd->state, TD_VBD_SHUTDOWN_REQUESTED);
DBG(TLOG_WARN, "%s: requests pending\n", vbd->name);
return -EAGAIN;
}
/*
* control operations
*/
void
tapdisk_vbd_debug(td_vbd_t *vbd)
{
td_image_t *image, *tmp;
int new, pending, failed, completed;
tapdisk_vbd_queue_count(vbd, &new, &pending, &failed, &completed);
DBG(TLOG_WARN, "%s: state: 0x%08x, new: 0x%02x, pending: 0x%02x, "
"failed: 0x%02x, completed: 0x%02x, last activity: %010ld.%06ld, "
"errors: 0x%04"PRIx64", retries: 0x%04"PRIx64", "
"received: 0x%08"PRIx64", returned: 0x%08"PRIx64", "
"kicked: 0x%08"PRIx64"\n",
vbd->name, vbd->state, new, pending, failed, completed,
vbd->ts.tv_sec, vbd->ts.tv_usec, vbd->errors, vbd->retries,
vbd->received, vbd->returned, vbd->kicked);
tapdisk_vbd_for_each_image(vbd, image, tmp)
td_debug(image);
}
static void
tapdisk_vbd_drop_log(td_vbd_t *vbd)
{
if (td_flag_test(vbd->state, TD_VBD_LOG_DROPPED))
return;
tapdisk_vbd_debug(vbd);
tlog_precious(0);
td_flag_set(vbd->state, TD_VBD_LOG_DROPPED);
}
int
tapdisk_vbd_get_disk_info(td_vbd_t *vbd, td_disk_info_t *info)
{
if (list_empty(&vbd->images))
return -EINVAL;
*info = tapdisk_vbd_first_image(vbd)->info;
return 0;
}
static int
tapdisk_vbd_queue_ready(td_vbd_t *vbd)
{
return (!td_flag_test(vbd->state, TD_VBD_DEAD) &&
!td_flag_test(vbd->state, TD_VBD_CLOSED) &&
!td_flag_test(vbd->state, TD_VBD_QUIESCED) &&
!td_flag_test(vbd->state, TD_VBD_QUIESCE_REQUESTED));
}
int
tapdisk_vbd_retry_needed(td_vbd_t *vbd)
{
return !(list_empty(&vbd->failed_requests) &&
list_empty(&vbd->new_requests));
}
int
tapdisk_vbd_lock(td_vbd_t *vbd)
{
return 0;
}
int
tapdisk_vbd_quiesce_queue(td_vbd_t *vbd)
{
if (!list_empty(&vbd->pending_requests)) {
td_flag_set(vbd->state, TD_VBD_QUIESCE_REQUESTED);
return -EAGAIN;
}
td_flag_clear(vbd->state, TD_VBD_QUIESCE_REQUESTED);
td_flag_set(vbd->state, TD_VBD_QUIESCED);
return 0;
}
int
tapdisk_vbd_start_queue(td_vbd_t *vbd)
{
td_flag_clear(vbd->state, TD_VBD_QUIESCED);
td_flag_clear(vbd->state, TD_VBD_QUIESCE_REQUESTED);
tapdisk_vbd_mark_progress(vbd);
return 0;
}
int
tapdisk_vbd_kill_queue(td_vbd_t *vbd)
{
tapdisk_vbd_quiesce_queue(vbd);
td_flag_set(vbd->state, TD_VBD_DEAD);
return 0;
}
#if 0
static int
tapdisk_vbd_open_image(td_vbd_t *vbd, td_image_t *image)
{
int err;
td_image_t *parent;
err = td_open(image);
if (err)
return err;
if (!tapdisk_vbd_is_last_image(vbd, image)) {
parent = tapdisk_vbd_next_image(image);
err = td_validate_parent(image, parent);
if (err) {
td_close(image);
return err;
}
}
return 0;
}
#endif
/*
* Pausing a tapdisk can produce a lot of logging if the storage is not available
* and there are inflight data requests. All the caller to squash the logging
* when entering a retry process.
*/
void tapdisk_vbd_squash_pause_logging(bool squash)
{
log = !squash;
}
int
tapdisk_vbd_pause(td_vbd_t *vbd)
{
int err;
struct td_xenblkif *blkif;
if (log) {
INFO("pause requested\n");
}
td_flag_set(vbd->state, TD_VBD_PAUSE_REQUESTED);
if (vbd->nbdserver)
tapdisk_nbdserver_pause(vbd->nbdserver, log);
err = tapdisk_vbd_quiesce_queue(vbd);
if (err)
return err;
list_for_each_entry(blkif, &vbd->rings, entry)
tapdisk_xenblkif_suspend(blkif);
tapdisk_vbd_close_vdi(vbd);
/* Don't guard this one as at this point the pause operation is complete */
INFO("pause completed\n");
if (!list_empty(&vbd->failed_requests))
INFO("warning: failed requests pending\n");
td_flag_clear(vbd->state, TD_VBD_PAUSE_REQUESTED);
td_flag_set(vbd->state, TD_VBD_PAUSED);
return 0;
}
int
tapdisk_vbd_resume(td_vbd_t *vbd, const char *name)
{
int i, err;
struct td_xenblkif *blkif;
DBG(TLOG_DBG, "resume requested\n");
if (!td_flag_test(vbd->state, TD_VBD_PAUSED)) {
EPRINTF("resume request for unpaused vbd %s\n", vbd->name);
return -EINVAL;
}
for (i = 0; i < TD_VBD_EIO_RETRIES; i++) {
err = tapdisk_vbd_open_vdi(vbd, name, vbd->flags | TD_OPEN_STRICT, -1);
if (!err)
break;
sleep(TD_VBD_EIO_SLEEP);
}
if (!err) {
td_disk_info_t disk_info;
err = tapdisk_vbd_get_disk_info(vbd, &disk_info);
if (err) {
EPRINTF("VBD %d failed to get disk info: %s\n", vbd->uuid,
strerror(-err));
goto resume_failed;
}
if (vbd->disk_info.size != disk_info.size
|| vbd->disk_info.sector_size != disk_info.sector_size
|| vbd->disk_info.info != disk_info.info) {
EPRINTF("VBD %d cannot change disk info\n", vbd->uuid);