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tapdisk-vbd.c
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tapdisk-vbd.c
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/*
* Copyright (c) 2008, XenSource Inc.
* Copyright (c) 2010, 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:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of XenSource Inc. 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 "libvhd.h"
#include "tapdisk-blktap.h"
#include "tapdisk-image.h"
#include "tapdisk-driver.h"
#include "tapdisk-server.h"
#include "tapdisk-vbd.h"
#include "tapdisk-disktype.h"
#include "tapdisk-interface.h"
#include "tapdisk-stats.h"
#include "tapdisk-storage.h"
#include "tapdisk-nbdserver.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)
#if 1
#define ASSERT(p) \
do { \
if (!(p)) { \
DPRINTF("Assertion '%s' failed, line %d, " \
"file %s", #p, __LINE__, __FILE__); \
*(int*)0 = 0; \
} \
} while (0)
#else
#define ASSERT(p) ((void)0)
#endif
#define TD_VBD_EIO_RETRIES 10
#define TD_VBD_EIO_SLEEP 1
#define TD_VBD_WATCHDOG_TIMEOUT 10
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 *);
/*
* 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;
}
vbd->uuid = uuid;
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);
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);
tapdisk_server_add_vbd(vbd);
return 0;
}
static int
tapdisk_vbd_validate_chain(td_vbd_t *vbd)
{
return tapdisk_image_validate_chain(&vbd->images);
}
void
tapdisk_vbd_close_vdi(td_vbd_t *vbd)
{
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);
if (!err)
goto done;
fail:
/* give up */
tapdisk_image_free(target);
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);
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;
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, &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;
parent = tapdisk_vbd_first_image(vbd);
log = tapdisk_image_allocate(parent->name,
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);
if (err)
goto fail;
tapdisk_vbd_add_image(vbd, log);
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->images);
if (err)
goto fail;
td_flag_clear(vbd->state, TD_VBD_CLOSED);
vbd->flags = flags;
if (td_flag_test(vbd->flags, TD_OPEN_LOG_DIRTY)) {
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;
}
}
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();
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
int
tapdisk_vbd_pause(td_vbd_t *vbd)
{
int err;
INFO("pause requested\n");
td_flag_set(vbd->state, TD_VBD_PAUSE_REQUESTED);
if(vbd->nbdserver) {
tapdisk_nbdserver_pause(vbd->nbdserver);
}
err = tapdisk_vbd_quiesce_queue(vbd);
if (err)
return err;
tapdisk_vbd_close_vdi(vbd);
INFO("pause completed\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;
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)
return err;
DBG(TLOG_DBG, "resume completed\n");
tapdisk_vbd_start_queue(vbd);
td_flag_clear(vbd->state, TD_VBD_PAUSED);
td_flag_clear(vbd->state, TD_VBD_PAUSE_REQUESTED);
tapdisk_vbd_check_state(vbd);
if(vbd->nbdserver) {
tapdisk_nbdserver_unpause(vbd->nbdserver);
}
DBG(TLOG_DBG, "state checked\n");
return 0;
}
static int
tapdisk_vbd_request_ttl(td_vbd_request_t *vreq,
const struct timeval *now)
{
struct timeval delta;
timersub(now, &vreq->ts, &delta);
return TD_VBD_REQUEST_TIMEOUT - delta.tv_sec;
}
static int
__tapdisk_vbd_request_timeout(td_vbd_request_t *vreq,
const struct timeval *now)
{
int timeout;
timeout = tapdisk_vbd_request_ttl(vreq, now) < 0;
if (timeout)
ERR(vreq->error,
"req %s timed out, retried %d times\n",
vreq->name, vreq->num_retries);
return timeout;
}
static int
tapdisk_vbd_request_timeout(td_vbd_request_t *vreq)
{
struct timeval now;
gettimeofday(&now, NULL);
return __tapdisk_vbd_request_timeout(vreq, &now);
}
static void
tapdisk_vbd_check_queue_state(td_vbd_t *vbd)
{
td_vbd_request_t *vreq, *tmp;
struct timeval now;
gettimeofday(&now, NULL);
tapdisk_vbd_for_each_request(vreq, tmp, &vbd->failed_requests)
if (__tapdisk_vbd_request_timeout(vreq, &now))
tapdisk_vbd_complete_vbd_request(vbd, vreq);
if (!list_empty(&vbd->new_requests) ||
!list_empty(&vbd->failed_requests))
tapdisk_vbd_issue_requests(vbd);
}
void
tapdisk_vbd_check_state(td_vbd_t *vbd)
{
tapdisk_vbd_check_queue_state(vbd);
if (td_flag_test(vbd->state, TD_VBD_QUIESCE_REQUESTED))
tapdisk_vbd_quiesce_queue(vbd);
if (td_flag_test(vbd->state, TD_VBD_PAUSE_REQUESTED))
tapdisk_vbd_pause(vbd);
if (td_flag_test(vbd->state, TD_VBD_SHUTDOWN_REQUESTED))
tapdisk_vbd_close(vbd);
}
void
tapdisk_vbd_check_progress(td_vbd_t *vbd)
{
time_t diff;
struct timeval now, delta;
if (list_empty(&vbd->pending_requests))
return;
gettimeofday(&now, NULL);
timersub(&now, &vbd->ts, &delta);
diff = delta.tv_sec;
if (diff >= TD_VBD_WATCHDOG_TIMEOUT && tapdisk_vbd_queue_ready(vbd)) {
DBG(TLOG_WARN, "%s: watchdog timeout: pending requests "
"idle for %ld seconds\n", vbd->name, diff);
tapdisk_vbd_drop_log(vbd);
return;
}
tapdisk_server_set_max_timeout(TD_VBD_WATCHDOG_TIMEOUT - diff);
}
/*
* request submission
*/
static int
tapdisk_vbd_check_queue(td_vbd_t *vbd)
{
if (list_empty(&vbd->images))
return -ENOSYS;
if (!tapdisk_vbd_queue_ready(vbd))
return -EAGAIN;
return 0;
}
static int
tapdisk_vbd_request_should_retry(td_vbd_t *vbd, td_vbd_request_t *vreq)
{
if (td_flag_test(vbd->state, TD_VBD_DEAD) ||
td_flag_test(vbd->state, TD_VBD_SHUTDOWN_REQUESTED))
return 0;
switch (abs(vreq->error)) {
case EPERM:
case ENOSYS:
case ESTALE:
case ENOSPC:
return 0;
}
if (tapdisk_vbd_request_timeout(vreq))
return 0;
return 1;
}
static void
tapdisk_vbd_complete_vbd_request(td_vbd_t *vbd, td_vbd_request_t *vreq)
{
if (!vreq->submitting && !vreq->secs_pending) {
if (vreq->error &&
tapdisk_vbd_request_should_retry(vbd, vreq))
tapdisk_vbd_move_request(vreq, &vbd->failed_requests);
else
tapdisk_vbd_move_request(vreq, &vbd->completed_requests);
}
}
static void
FIXME_maybe_count_enospc_redirect(td_vbd_t *vbd, td_request_t treq)
{
int write = treq.op == TD_OP_WRITE;
if (write &&
treq.image == tapdisk_vbd_first_image(vbd) &&
vbd->FIXME_enospc_redirect_count_enabled)
vbd->FIXME_enospc_redirect_count += treq.secs;
}
static void
__tapdisk_vbd_complete_td_request(td_vbd_t *vbd, td_vbd_request_t *vreq,
td_request_t treq, int res)
{
td_image_t *image = treq.image;
int err;