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blkdebug: Implement bdrv_co_preadv/pwritev/flush 

This enables byte granularity requests for blkdebug, and at the same
time gets us rid of another user of the BDS-level AIO emulation.

Note that unless align=512 is specified, this can behave subtly
different from the old behaviour because bdrv_co_preadv/pwritev don't
have to perform alignment adjustments any more.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Kevin Wolf 2016-11-04 21:13:45 +01:00
parent 7c37f941d0
commit 7c3a998531
1 changed files with 40 additions and 46 deletions
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86
block/blkdebug.c
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@ -58,10 +58,6 @@ typedef struct BlkdebugSuspendedReq {
QLIST_ENTRY(BlkdebugSuspendedReq) next;
} BlkdebugSuspendedReq;
static const AIOCBInfo blkdebug_aiocb_info = {
.aiocb_size = sizeof(BlkdebugAIOCB),
};
enum {
ACTION_INJECT_ERROR,
ACTION_SET_STATE,
@ -77,7 +73,7 @@ typedef struct BlkdebugRule {
int error;
int immediately;
int once;
int64_t sector;
int64_t offset;
} inject;
struct {
int new_state;
@ -174,6 +170,7 @@ static int add_rule(void *opaque, QemuOpts *opts, Error **errp)
const char* event_name;
BlkdebugEvent event;
struct BlkdebugRule *rule;
int64_t sector;
/* Find the right event for the rule */
event_name = qemu_opt_get(opts, "event");
@ -200,7 +197,9 @@ static int add_rule(void *opaque, QemuOpts *opts, Error **errp)
rule->options.inject.once = qemu_opt_get_bool(opts, "once", 0);
rule->options.inject.immediately =
qemu_opt_get_bool(opts, "immediately", 0);
rule->options.inject.sector = qemu_opt_get_number(opts, "sector", -1);
sector = qemu_opt_get_number(opts, "sector", -1);
rule->options.inject.offset =
sector == -1 ? -1 : sector * BDRV_SECTOR_SIZE;
break;
case ACTION_SET_STATE:
@ -408,17 +407,14 @@ out:
static void error_callback_bh(void *opaque)
{
struct BlkdebugAIOCB *acb = opaque;
acb->common.cb(acb->common.opaque, acb->ret);
qemu_aio_unref(acb);
Coroutine *co = opaque;
qemu_coroutine_enter(co);
}
static BlockAIOCB *inject_error(BlockDriverState *bs,
BlockCompletionFunc *cb, void *opaque, BlkdebugRule *rule)
static int inject_error(BlockDriverState *bs, BlkdebugRule *rule)
{
BDRVBlkdebugState *s = bs->opaque;
int error = rule->options.inject.error;
struct BlkdebugAIOCB *acb;
bool immediately = rule->options.inject.immediately;
if (rule->options.inject.once) {
@ -426,81 +422,79 @@ static BlockAIOCB *inject_error(BlockDriverState *bs,
remove_rule(rule);
}
if (immediately) {
return NULL;
if (!immediately) {
aio_bh_schedule_oneshot(bdrv_get_aio_context(bs), error_callback_bh,
qemu_coroutine_self());
qemu_coroutine_yield();
}
acb = qemu_aio_get(&blkdebug_aiocb_info, bs, cb, opaque);
acb->ret = -error;
aio_bh_schedule_oneshot(bdrv_get_aio_context(bs), error_callback_bh, acb);
return &acb->common;
return -error;
}
static BlockAIOCB *blkdebug_aio_readv(BlockDriverState *bs,
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
BlockCompletionFunc *cb, void *opaque)
static int coroutine_fn
blkdebug_co_preadv(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
QEMUIOVector *qiov, int flags)
{
BDRVBlkdebugState *s = bs->opaque;
BlkdebugRule *rule = NULL;
QSIMPLEQ_FOREACH(rule, &s->active_rules, active_next) {
if (rule->options.inject.sector == -1 ||
(rule->options.inject.sector >= sector_num &&
rule->options.inject.sector < sector_num + nb_sectors)) {
uint64_t inject_offset = rule->options.inject.offset;
if (inject_offset == -1 ||
(inject_offset >= offset && inject_offset < offset + bytes))
{
break;
}
}
if (rule && rule->options.inject.error) {
return inject_error(bs, cb, opaque, rule);
return inject_error(bs, rule);
}
return bdrv_aio_readv(bs->file, sector_num, qiov, nb_sectors,
cb, opaque);
return bdrv_co_preadv(bs->file, offset, bytes, qiov, flags);
}
static BlockAIOCB *blkdebug_aio_writev(BlockDriverState *bs,
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
BlockCompletionFunc *cb, void *opaque)
static int coroutine_fn
blkdebug_co_pwritev(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
QEMUIOVector *qiov, int flags)
{
BDRVBlkdebugState *s = bs->opaque;
BlkdebugRule *rule = NULL;
QSIMPLEQ_FOREACH(rule, &s->active_rules, active_next) {
if (rule->options.inject.sector == -1 ||
(rule->options.inject.sector >= sector_num &&
rule->options.inject.sector < sector_num + nb_sectors)) {
uint64_t inject_offset = rule->options.inject.offset;
if (inject_offset == -1 ||
(inject_offset >= offset && inject_offset < offset + bytes))
{
break;
}
}
if (rule && rule->options.inject.error) {
return inject_error(bs, cb, opaque, rule);
return inject_error(bs, rule);
}
return bdrv_aio_writev(bs->file, sector_num, qiov, nb_sectors,
cb, opaque);
return bdrv_co_pwritev(bs->file, offset, bytes, qiov, flags);
}
static BlockAIOCB *blkdebug_aio_flush(BlockDriverState *bs,
BlockCompletionFunc *cb, void *opaque)
static int blkdebug_co_flush(BlockDriverState *bs)
{
BDRVBlkdebugState *s = bs->opaque;
BlkdebugRule *rule = NULL;
QSIMPLEQ_FOREACH(rule, &s->active_rules, active_next) {
if (rule->options.inject.sector == -1) {
if (rule->options.inject.offset == -1) {
break;
}
}
if (rule && rule->options.inject.error) {
return inject_error(bs, cb, opaque, rule);
return inject_error(bs, rule);
}
return bdrv_aio_flush(bs->file->bs, cb, opaque);
return bdrv_co_flush(bs->file->bs);
}
@ -752,9 +746,9 @@ static BlockDriver bdrv_blkdebug = {
.bdrv_refresh_filename = blkdebug_refresh_filename,
.bdrv_refresh_limits = blkdebug_refresh_limits,
.bdrv_aio_readv = blkdebug_aio_readv,
.bdrv_aio_writev = blkdebug_aio_writev,
.bdrv_aio_flush = blkdebug_aio_flush,
.bdrv_co_preadv = blkdebug_co_preadv,
.bdrv_co_pwritev = blkdebug_co_pwritev,
.bdrv_co_flush_to_disk = blkdebug_co_flush,
.bdrv_debug_event = blkdebug_debug_event,
.bdrv_debug_breakpoint = blkdebug_debug_breakpoint,