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Merge remote-tracking branch 'remotes/cody/tags/block-pull-request' into staging

# gpg: Signature made Fri 25 Sep 2015 16:47:31 BST using RSA key ID C0DE3057
# gpg: Good signature from "Jeffrey Cody <jcody@redhat.com>"
# gpg:                 aka "Jeffrey Cody <jeff@codyprime.org>"
# gpg:                 aka "Jeffrey Cody <codyprime@gmail.com>"

* remotes/cody/tags/block-pull-request:
  sheepdog: refine discard support
  sheepdog: use per AIOCB dirty indexes for non overlapping requests
  Backup: don't do copy-on-read in before_write_notifier
  block: Introduce a new API bdrv_co_no_copy_on_readv()
  sheepdog: add reopen support
  block/nfs: cache allocated filesize for read-only files
  block/nfs: fix calculation of allocated file size

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Maydell 2015-09-25 19:01:46 +01:00
commit 54b376230c
6 changed files with 200 additions and 48 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
block/backup.c
View File

@ -89,7 +89,8 @@ static void cow_request_end(CowRequest *req)
static int coroutine_fn backup_do_cow(BlockDriverState *bs,
int64_t sector_num, int nb_sectors,
bool *error_is_read)
bool *error_is_read,
bool is_write_notifier)
{
BackupBlockJob *job = (BackupBlockJob *)bs->job;
CowRequest cow_request;
@ -129,8 +130,14 @@ static int coroutine_fn backup_do_cow(BlockDriverState *bs,
iov.iov_len = n * BDRV_SECTOR_SIZE;
qemu_iovec_init_external(&bounce_qiov, &iov, 1);
ret = bdrv_co_readv(bs, start * BACKUP_SECTORS_PER_CLUSTER, n,
&bounce_qiov);
if (is_write_notifier) {
ret = bdrv_co_no_copy_on_readv(bs,
start * BACKUP_SECTORS_PER_CLUSTER,
n, &bounce_qiov);
} else {
ret = bdrv_co_readv(bs, start * BACKUP_SECTORS_PER_CLUSTER, n,
&bounce_qiov);
}
if (ret < 0) {
trace_backup_do_cow_read_fail(job, start, ret);
if (error_is_read) {
@ -190,7 +197,7 @@ static int coroutine_fn backup_before_write_notify(
assert((req->offset & (BDRV_SECTOR_SIZE - 1)) == 0);
assert((req->bytes & (BDRV_SECTOR_SIZE - 1)) == 0);
return backup_do_cow(req->bs, sector_num, nb_sectors, NULL);
return backup_do_cow(req->bs, sector_num, nb_sectors, NULL, true);
}
static void backup_set_speed(BlockJob *job, int64_t speed, Error **errp)
@ -303,7 +310,8 @@ static int coroutine_fn backup_run_incremental(BackupBlockJob *job)
return ret;
}
ret = backup_do_cow(bs, cluster * BACKUP_SECTORS_PER_CLUSTER,
BACKUP_SECTORS_PER_CLUSTER, &error_is_read);
BACKUP_SECTORS_PER_CLUSTER, &error_is_read,
false);
if ((ret < 0) &&
backup_error_action(job, error_is_read, -ret) ==
BLOCK_ERROR_ACTION_REPORT) {
@ -408,7 +416,7 @@ static void coroutine_fn backup_run(void *opaque)
}
/* FULL sync mode we copy the whole drive. */
ret = backup_do_cow(bs, start * BACKUP_SECTORS_PER_CLUSTER,
BACKUP_SECTORS_PER_CLUSTER, &error_is_read);
BACKUP_SECTORS_PER_CLUSTER, &error_is_read, false);
if (ret < 0) {
/* Depending on error action, fail now or retry cluster */
BlockErrorAction action =

12
block/io.c
View File

@ -932,7 +932,8 @@ static int coroutine_fn bdrv_co_do_preadv(BlockDriverState *bs,
return ret;
}
if (bs->copy_on_read) {
/* Don't do copy-on-read if we read data before write operation */
if (bs->copy_on_read && !(flags & BDRV_REQ_NO_COPY_ON_READ)) {
flags |= BDRV_REQ_COPY_ON_READ;
}
@ -1001,6 +1002,15 @@ int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num,
return bdrv_co_do_readv(bs, sector_num, nb_sectors, qiov, 0);
}
int coroutine_fn bdrv_co_no_copy_on_readv(BlockDriverState *bs,
int64_t sector_num, int nb_sectors, QEMUIOVector *qiov)
{
trace_bdrv_co_no_copy_on_readv(bs, sector_num, nb_sectors);
return bdrv_co_do_readv(bs, sector_num, nb_sectors, qiov,
BDRV_REQ_NO_COPY_ON_READ);
}
int coroutine_fn bdrv_co_copy_on_readv(BlockDriverState *bs,
int64_t sector_num, int nb_sectors, QEMUIOVector *qiov)
{

38
block/nfs.c
View File

@ -43,6 +43,7 @@ typedef struct NFSClient {
int events;
bool has_zero_init;
AioContext *aio_context;
blkcnt_t st_blocks;
} NFSClient;
typedef struct NFSRPC {
@ -374,6 +375,7 @@ static int64_t nfs_client_open(NFSClient *client, const char *filename,
}
ret = DIV_ROUND_UP(st.st_size, BDRV_SECTOR_SIZE);
client->st_blocks = st.st_blocks;
client->has_zero_init = S_ISREG(st.st_mode);
goto out;
fail:
@ -464,6 +466,11 @@ static int64_t nfs_get_allocated_file_size(BlockDriverState *bs)
NFSRPC task = {0};
struct stat st;
if (bdrv_is_read_only(bs) &&
!(bs->open_flags & BDRV_O_NOCACHE)) {
return client->st_blocks * 512;
}
task.st = &st;
if (nfs_fstat_async(client->context, client->fh, nfs_co_generic_cb,
&task) != 0) {
@ -475,7 +482,7 @@ static int64_t nfs_get_allocated_file_size(BlockDriverState *bs)
aio_poll(client->aio_context, true);
}
return (task.ret < 0 ? task.ret : st.st_blocks * st.st_blksize);
return (task.ret < 0 ? task.ret : st.st_blocks * 512);
}
static int nfs_file_truncate(BlockDriverState *bs, int64_t offset)
@ -484,6 +491,34 @@ static int nfs_file_truncate(BlockDriverState *bs, int64_t offset)
return nfs_ftruncate(client->context, client->fh, offset);
}
/* Note that this will not re-establish a connection with the NFS server
* - it is effectively a NOP. */
static int nfs_reopen_prepare(BDRVReopenState *state,
BlockReopenQueue *queue, Error **errp)
{
NFSClient *client = state->bs->opaque;
struct stat st;
int ret = 0;
if (state->flags & BDRV_O_RDWR && bdrv_is_read_only(state->bs)) {
error_setg(errp, "Cannot open a read-only mount as read-write");
return -EACCES;
}
/* Update cache for read-only reopens */
if (!(state->flags & BDRV_O_RDWR)) {
ret = nfs_fstat(client->context, client->fh, &st);
if (ret < 0) {
error_setg(errp, "Failed to fstat file: %s",
nfs_get_error(client->context));
return ret;
}
client->st_blocks = st.st_blocks;
}
return 0;
}
static BlockDriver bdrv_nfs = {
.format_name = "nfs",
.protocol_name = "nfs",
@ -499,6 +534,7 @@ static BlockDriver bdrv_nfs = {
.bdrv_file_open = nfs_file_open,
.bdrv_close = nfs_file_close,
.bdrv_create = nfs_file_create,
.bdrv_reopen_prepare = nfs_reopen_prepare,
.bdrv_co_readv = nfs_co_readv,
.bdrv_co_writev = nfs_co_writev,

168
block/sheepdog.c
View File

@ -28,7 +28,6 @@
#define SD_OP_READ_OBJ 0x02
#define SD_OP_WRITE_OBJ 0x03
/* 0x04 is used internally by Sheepdog */
#define SD_OP_DISCARD_OBJ 0x05
#define SD_OP_NEW_VDI 0x11
#define SD_OP_LOCK_VDI 0x12
@ -318,7 +317,7 @@ enum AIOCBState {
AIOCB_DISCARD_OBJ,
};
#define AIOCBOverwrapping(x, y) \
#define AIOCBOverlapping(x, y) \
(!(x->max_affect_data_idx < y->min_affect_data_idx \
|| y->max_affect_data_idx < x->min_affect_data_idx))
@ -342,6 +341,15 @@ struct SheepdogAIOCB {
uint32_t min_affect_data_idx;
uint32_t max_affect_data_idx;
/*
* The difference between affect_data_idx and dirty_data_idx:
* affect_data_idx represents range of index of all request types.
* dirty_data_idx represents range of index updated by COW requests.
* dirty_data_idx is used for updating an inode object.
*/
uint32_t min_dirty_data_idx;
uint32_t max_dirty_data_idx;
QLIST_ENTRY(SheepdogAIOCB) aiocb_siblings;
};
@ -351,9 +359,6 @@ typedef struct BDRVSheepdogState {
SheepdogInode inode;
uint32_t min_dirty_data_idx;
uint32_t max_dirty_data_idx;
char name[SD_MAX_VDI_LEN];
bool is_snapshot;
uint32_t cache_flags;
@ -373,10 +378,15 @@ typedef struct BDRVSheepdogState {
QLIST_HEAD(inflight_aio_head, AIOReq) inflight_aio_head;
QLIST_HEAD(failed_aio_head, AIOReq) failed_aio_head;
CoQueue overwrapping_queue;
CoQueue overlapping_queue;
QLIST_HEAD(inflight_aiocb_head, SheepdogAIOCB) inflight_aiocb_head;
} BDRVSheepdogState;
typedef struct BDRVSheepdogReopenState {
int fd;
int cache_flags;
} BDRVSheepdogReopenState;
static const char * sd_strerror(int err)
{
int i;
@ -556,6 +566,9 @@ static SheepdogAIOCB *sd_aio_setup(BlockDriverState *bs, QEMUIOVector *qiov,
acb->max_affect_data_idx = (acb->sector_num * BDRV_SECTOR_SIZE +
acb->nb_sectors * BDRV_SECTOR_SIZE) / object_size;
acb->min_dirty_data_idx = UINT32_MAX;
acb->max_dirty_data_idx = 0;
return acb;
}
@ -819,8 +832,8 @@ static void coroutine_fn aio_read_response(void *opaque)
*/
if (rsp.result == SD_RES_SUCCESS) {
s->inode.data_vdi_id[idx] = s->inode.vdi_id;
s->max_dirty_data_idx = MAX(idx, s->max_dirty_data_idx);
s->min_dirty_data_idx = MIN(idx, s->min_dirty_data_idx);
acb->max_dirty_data_idx = MAX(idx, acb->max_dirty_data_idx);
acb->min_dirty_data_idx = MIN(idx, acb->min_dirty_data_idx);
}
}
break;
@ -847,10 +860,6 @@ static void coroutine_fn aio_read_response(void *opaque)
rsp.result = SD_RES_SUCCESS;
s->discard_supported = false;
break;
case SD_RES_SUCCESS:
idx = data_oid_to_idx(aio_req->oid);
s->inode.data_vdi_id[idx] = 0;
break;
default:
break;
}
@ -1165,7 +1174,13 @@ static void coroutine_fn add_aio_request(BDRVSheepdogState *s, AIOReq *aio_req,
hdr.flags = SD_FLAG_CMD_WRITE | flags;
break;
case AIOCB_DISCARD_OBJ:
hdr.opcode = SD_OP_DISCARD_OBJ;
hdr.opcode = SD_OP_WRITE_OBJ;
hdr.flags = SD_FLAG_CMD_WRITE | flags;
s->inode.data_vdi_id[data_oid_to_idx(oid)] = 0;
offset = offsetof(SheepdogInode,
data_vdi_id[data_oid_to_idx(oid)]);
oid = vid_to_vdi_oid(s->inode.vdi_id);
wlen = datalen = sizeof(uint32_t);
break;
}
@ -1466,13 +1481,11 @@ static int sd_open(BlockDriverState *bs, QDict *options, int flags,
}
memcpy(&s->inode, buf, sizeof(s->inode));
s->min_dirty_data_idx = UINT32_MAX;
s->max_dirty_data_idx = 0;
bs->total_sectors = s->inode.vdi_size / BDRV_SECTOR_SIZE;
pstrcpy(s->name, sizeof(s->name), vdi);
qemu_co_mutex_init(&s->lock);
qemu_co_queue_init(&s->overwrapping_queue);
qemu_co_queue_init(&s->overlapping_queue);
qemu_opts_del(opts);
g_free(buf);
return 0;
@ -1486,6 +1499,68 @@ out:
return ret;
}
static int sd_reopen_prepare(BDRVReopenState *state, BlockReopenQueue *queue,
Error **errp)
{
BDRVSheepdogState *s = state->bs->opaque;
BDRVSheepdogReopenState *re_s;
int ret = 0;
re_s = state->opaque = g_new0(BDRVSheepdogReopenState, 1);
re_s->cache_flags = SD_FLAG_CMD_CACHE;
if (state->flags & BDRV_O_NOCACHE) {
re_s->cache_flags = SD_FLAG_CMD_DIRECT;
}
re_s->fd = get_sheep_fd(s, errp);
if (re_s->fd < 0) {
ret = re_s->fd;
return ret;
}
return ret;
}
static void sd_reopen_commit(BDRVReopenState *state)
{
BDRVSheepdogReopenState *re_s = state->opaque;
BDRVSheepdogState *s = state->bs->opaque;
if (s->fd) {
aio_set_fd_handler(s->aio_context, s->fd, NULL, NULL, NULL);
closesocket(s->fd);
}
s->fd = re_s->fd;
s->cache_flags = re_s->cache_flags;
g_free(state->opaque);
state->opaque = NULL;
return;
}
static void sd_reopen_abort(BDRVReopenState *state)
{
BDRVSheepdogReopenState *re_s = state->opaque;
BDRVSheepdogState *s = state->bs->opaque;
if (re_s == NULL) {
return;
}
if (re_s->fd) {
aio_set_fd_handler(s->aio_context, re_s->fd, NULL, NULL, NULL);
closesocket(re_s->fd);
}
g_free(state->opaque);
state->opaque = NULL;
return;
}
static int do_sd_create(BDRVSheepdogState *s, uint32_t *vdi_id, int snapshot,
Error **errp)
{
@ -1922,16 +1997,16 @@ static void coroutine_fn sd_write_done(SheepdogAIOCB *acb)
AIOReq *aio_req;
uint32_t offset, data_len, mn, mx;
mn = s->min_dirty_data_idx;
mx = s->max_dirty_data_idx;
mn = acb->min_dirty_data_idx;
mx = acb->max_dirty_data_idx;
if (mn <= mx) {
/* we need to update the vdi object. */
offset = sizeof(s->inode) - sizeof(s->inode.data_vdi_id) +
mn * sizeof(s->inode.data_vdi_id[0]);
data_len = (mx - mn + 1) * sizeof(s->inode.data_vdi_id[0]);
s->min_dirty_data_idx = UINT32_MAX;
s->max_dirty_data_idx = 0;
acb->min_dirty_data_idx = UINT32_MAX;
acb->max_dirty_data_idx = 0;
iov.iov_base = &s->inode;
iov.iov_len = sizeof(s->inode);
@ -2140,7 +2215,9 @@ static int coroutine_fn sd_co_rw_vector(void *p)
}
aio_req = alloc_aio_req(s, acb, oid, len, offset, flags, create,
old_oid, done);
old_oid,
acb->aiocb_type == AIOCB_DISCARD_OBJ ?
0 : done);
QLIST_INSERT_HEAD(&s->inflight_aio_head, aio_req, aio_siblings);
add_aio_request(s, aio_req, acb->qiov->iov, acb->qiov->niov,
@ -2157,12 +2234,12 @@ out:
return 1;
}
static bool check_overwrapping_aiocb(BDRVSheepdogState *s, SheepdogAIOCB *aiocb)
static bool check_overlapping_aiocb(BDRVSheepdogState *s, SheepdogAIOCB *aiocb)
{
SheepdogAIOCB *cb;
QLIST_FOREACH(cb, &s->inflight_aiocb_head, aiocb_siblings) {
if (AIOCBOverwrapping(aiocb, cb)) {
if (AIOCBOverlapping(aiocb, cb)) {
return true;
}
}
@ -2191,15 +2268,15 @@ static coroutine_fn int sd_co_writev(BlockDriverState *bs, int64_t sector_num,
acb->aiocb_type = AIOCB_WRITE_UDATA;
retry:
if (check_overwrapping_aiocb(s, acb)) {
qemu_co_queue_wait(&s->overwrapping_queue);
if (check_overlapping_aiocb(s, acb)) {
qemu_co_queue_wait(&s->overlapping_queue);
goto retry;
}
ret = sd_co_rw_vector(acb);
if (ret <= 0) {
QLIST_REMOVE(acb, aiocb_siblings);
qemu_co_queue_restart_all(&s->overwrapping_queue);
qemu_co_queue_restart_all(&s->overlapping_queue);
qemu_aio_unref(acb);
return ret;
}
@ -2207,7 +2284,7 @@ retry:
qemu_coroutine_yield();
QLIST_REMOVE(acb, aiocb_siblings);
qemu_co_queue_restart_all(&s->overwrapping_queue);
qemu_co_queue_restart_all(&s->overlapping_queue);
return acb->ret;
}
@ -2224,15 +2301,15 @@ static coroutine_fn int sd_co_readv(BlockDriverState *bs, int64_t sector_num,
acb->aio_done_func = sd_finish_aiocb;
retry:
if (check_overwrapping_aiocb(s, acb)) {
qemu_co_queue_wait(&s->overwrapping_queue);
if (check_overlapping_aiocb(s, acb)) {
qemu_co_queue_wait(&s->overlapping_queue);
goto retry;
}
ret = sd_co_rw_vector(acb);
if (ret <= 0) {
QLIST_REMOVE(acb, aiocb_siblings);
qemu_co_queue_restart_all(&s->overwrapping_queue);
qemu_co_queue_restart_all(&s->overlapping_queue);
qemu_aio_unref(acb);
return ret;
}
@ -2240,7 +2317,7 @@ retry:
qemu_coroutine_yield();
QLIST_REMOVE(acb, aiocb_siblings);
qemu_co_queue_restart_all(&s->overwrapping_queue);
qemu_co_queue_restart_all(&s->overlapping_queue);
return acb->ret;
}
@ -2576,28 +2653,36 @@ static coroutine_fn int sd_co_discard(BlockDriverState *bs, int64_t sector_num,
int nb_sectors)
{
SheepdogAIOCB *acb;
QEMUIOVector dummy;
BDRVSheepdogState *s = bs->opaque;
int ret;
QEMUIOVector discard_iov;
struct iovec iov;
uint32_t zero = 0;
if (!s->discard_supported) {
return 0;
}
acb = sd_aio_setup(bs, &dummy, sector_num, nb_sectors);
memset(&discard_iov, 0, sizeof(discard_iov));
memset(&iov, 0, sizeof(iov));
iov.iov_base = &zero;
iov.iov_len = sizeof(zero);
discard_iov.iov = &iov;
discard_iov.niov = 1;
acb = sd_aio_setup(bs, &discard_iov, sector_num, nb_sectors);
acb->aiocb_type = AIOCB_DISCARD_OBJ;
acb->aio_done_func = sd_finish_aiocb;
retry:
if (check_overwrapping_aiocb(s, acb)) {
qemu_co_queue_wait(&s->overwrapping_queue);
if (check_overlapping_aiocb(s, acb)) {
qemu_co_queue_wait(&s->overlapping_queue);
goto retry;
}
ret = sd_co_rw_vector(acb);
if (ret <= 0) {
QLIST_REMOVE(acb, aiocb_siblings);
qemu_co_queue_restart_all(&s->overwrapping_queue);
qemu_co_queue_restart_all(&s->overlapping_queue);
qemu_aio_unref(acb);
return ret;
}
@ -2605,7 +2690,7 @@ retry:
qemu_coroutine_yield();
QLIST_REMOVE(acb, aiocb_siblings);
qemu_co_queue_restart_all(&s->overwrapping_queue);
qemu_co_queue_restart_all(&s->overlapping_queue);
return acb->ret;
}
@ -2702,6 +2787,9 @@ static BlockDriver bdrv_sheepdog = {
.instance_size = sizeof(BDRVSheepdogState),
.bdrv_needs_filename = true,
.bdrv_file_open = sd_open,
.bdrv_reopen_prepare = sd_reopen_prepare,
.bdrv_reopen_commit = sd_reopen_commit,
.bdrv_reopen_abort = sd_reopen_abort,
.bdrv_close = sd_close,
.bdrv_create = sd_create,
.bdrv_has_zero_init = bdrv_has_zero_init_1,
@ -2735,6 +2823,9 @@ static BlockDriver bdrv_sheepdog_tcp = {
.instance_size = sizeof(BDRVSheepdogState),
.bdrv_needs_filename = true,
.bdrv_file_open = sd_open,
.bdrv_reopen_prepare = sd_reopen_prepare,
.bdrv_reopen_commit = sd_reopen_commit,
.bdrv_reopen_abort = sd_reopen_abort,
.bdrv_close = sd_close,
.bdrv_create = sd_create,
.bdrv_has_zero_init = bdrv_has_zero_init_1,
@ -2768,6 +2859,9 @@ static BlockDriver bdrv_sheepdog_unix = {
.instance_size = sizeof(BDRVSheepdogState),
.bdrv_needs_filename = true,
.bdrv_file_open = sd_open,
.bdrv_reopen_prepare = sd_reopen_prepare,
.bdrv_reopen_commit = sd_reopen_commit,
.bdrv_reopen_abort = sd_reopen_abort,
.bdrv_close = sd_close,
.bdrv_create = sd_create,
.bdrv_has_zero_init = bdrv_has_zero_init_1,

9
include/block/block.h
View File

@ -51,15 +51,16 @@ typedef struct BlockFragInfo {
} BlockFragInfo;
typedef enum {
BDRV_REQ_COPY_ON_READ = 0x1,
BDRV_REQ_ZERO_WRITE = 0x2,
BDRV_REQ_COPY_ON_READ = 0x1,
BDRV_REQ_ZERO_WRITE = 0x2,
/* The BDRV_REQ_MAY_UNMAP flag is used to indicate that the block driver
* is allowed to optimize a write zeroes request by unmapping (discarding)
* blocks if it is guaranteed that the result will read back as
* zeroes. The flag is only passed to the driver if the block device is
* opened with BDRV_O_UNMAP.
*/
BDRV_REQ_MAY_UNMAP = 0x4,
BDRV_REQ_MAY_UNMAP = 0x4,
BDRV_REQ_NO_COPY_ON_READ = 0x8,
} BdrvRequestFlags;
typedef struct BlockSizes {
@ -252,6 +253,8 @@ int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num,
int nb_sectors, QEMUIOVector *qiov);
int coroutine_fn bdrv_co_copy_on_readv(BlockDriverState *bs,
int64_t sector_num, int nb_sectors, QEMUIOVector *qiov);
int coroutine_fn bdrv_co_no_copy_on_readv(BlockDriverState *bs,
int64_t sector_num, int nb_sectors, QEMUIOVector *qiov);
int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num,
int nb_sectors, QEMUIOVector *qiov);
/*

1
trace-events
View File

@ -69,6 +69,7 @@ bdrv_aio_write_zeroes(void *bs, int64_t sector_num, int nb_sectors, int flags, v
bdrv_lock_medium(void *bs, bool locked) "bs %p locked %d"
bdrv_co_readv(void *bs, int64_t sector_num, int nb_sector) "bs %p sector_num %"PRId64" nb_sectors %d"
bdrv_co_copy_on_readv(void *bs, int64_t sector_num, int nb_sector) "bs %p sector_num %"PRId64" nb_sectors %d"
bdrv_co_no_copy_on_readv(void *bs, int64_t sector_num, int nb_sector) "bs %p sector_num %"PRId64" nb_sectors %d"
bdrv_co_writev(void *bs, int64_t sector_num, int nb_sector) "bs %p sector_num %"PRId64" nb_sectors %d"
bdrv_co_write_zeroes(void *bs, int64_t sector_num, int nb_sector, int flags) "bs %p sector_num %"PRId64" nb_sectors %d flags %#x"
bdrv_co_io_em(void *bs, int64_t sector_num, int nb_sectors, int is_write, void *acb) "bs %p sector_num %"PRId64" nb_sectors %d is_write %d acb %p"