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Merge remote-tracking branch 'remotes/cody/tags/jtc-for-upstream-pull-request' into staging

# gpg: Signature made Tue Jul 28 05:22:29 2015 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>"
# gpg: WARNING: This key is not certified with sufficiently trusted signatures!
# gpg:          It is not certain that the signature belongs to the owner.
# Primary key fingerprint: 9957 4B4D 3474 90E7 9D98  D624 BDBE 7B27 C0DE 3057

* remotes/cody/tags/jtc-for-upstream-pull-request:
  block/ssh: Avoid segfault if inet_connect doesn't set errno.
  sheepdog: serialize requests to overwrapping area

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Maydell 2015-07-28 13:22:57 +01:00
commit 9f8c5b69c2
2 changed files with 72 additions and 82 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

152
block/sheepdog.c
View File

@ -318,6 +318,10 @@ enum AIOCBState {
AIOCB_DISCARD_OBJ,
};
#define AIOCBOverwrapping(x, y) \
(!(x->max_affect_data_idx < y->min_affect_data_idx \
|| y->max_affect_data_idx < x->min_affect_data_idx))
struct SheepdogAIOCB {
BlockAIOCB common;
@ -334,6 +338,11 @@ struct SheepdogAIOCB {
bool cancelable;
int nr_pending;
uint32_t min_affect_data_idx;
uint32_t max_affect_data_idx;
QLIST_ENTRY(SheepdogAIOCB) aiocb_siblings;
};
typedef struct BDRVSheepdogState {
@ -362,8 +371,10 @@ typedef struct BDRVSheepdogState {
/* Every aio request must be linked to either of these queues. */
QLIST_HEAD(inflight_aio_head, AIOReq) inflight_aio_head;
QLIST_HEAD(pending_aio_head, AIOReq) pending_aio_head;
QLIST_HEAD(failed_aio_head, AIOReq) failed_aio_head;
CoQueue overwrapping_queue;
QLIST_HEAD(inflight_aiocb_head, SheepdogAIOCB) inflight_aiocb_head;
} BDRVSheepdogState;
static const char * sd_strerror(int err)
@ -498,13 +509,7 @@ static void sd_aio_cancel(BlockAIOCB *blockacb)
AIOReq *aioreq, *next;
if (sd_acb_cancelable(acb)) {
/* Remove outstanding requests from pending and failed queues. */
QLIST_FOREACH_SAFE(aioreq, &s->pending_aio_head, aio_siblings,
next) {
if (aioreq->aiocb == acb) {
free_aio_req(s, aioreq);
}
}
/* Remove outstanding requests from failed queue. */
QLIST_FOREACH_SAFE(aioreq, &s->failed_aio_head, aio_siblings,
next) {
if (aioreq->aiocb == acb) {
@ -529,6 +534,10 @@ static SheepdogAIOCB *sd_aio_setup(BlockDriverState *bs, QEMUIOVector *qiov,
int64_t sector_num, int nb_sectors)
{
SheepdogAIOCB *acb;
uint32_t object_size;
BDRVSheepdogState *s = bs->opaque;
object_size = (UINT32_C(1) << s->inode.block_size_shift);
acb = qemu_aio_get(&sd_aiocb_info, bs, NULL, NULL);
@ -542,6 +551,11 @@ static SheepdogAIOCB *sd_aio_setup(BlockDriverState *bs, QEMUIOVector *qiov,
acb->coroutine = qemu_coroutine_self();
acb->ret = 0;
acb->nr_pending = 0;
acb->min_affect_data_idx = acb->sector_num * BDRV_SECTOR_SIZE / object_size;
acb->max_affect_data_idx = (acb->sector_num * BDRV_SECTOR_SIZE +
acb->nb_sectors * BDRV_SECTOR_SIZE) / object_size;
return acb;
}
@ -703,38 +717,6 @@ static int reload_inode(BDRVSheepdogState *s, uint32_t snapid, const char *tag);
static int get_sheep_fd(BDRVSheepdogState *s, Error **errp);
static void co_write_request(void *opaque);
static AIOReq *find_pending_req(BDRVSheepdogState *s, uint64_t oid)
{
AIOReq *aio_req;
QLIST_FOREACH(aio_req, &s->pending_aio_head, aio_siblings) {
if (aio_req->oid == oid) {
return aio_req;
}
}
return NULL;
}
/*
* This function searchs pending requests to the object `oid', and
* sends them.
*/
static void coroutine_fn send_pending_req(BDRVSheepdogState *s, uint64_t oid)
{
AIOReq *aio_req;
SheepdogAIOCB *acb;
while ((aio_req = find_pending_req(s, oid)) != NULL) {
acb = aio_req->aiocb;
/* move aio_req from pending list to inflight one */
QLIST_REMOVE(aio_req, aio_siblings);
QLIST_INSERT_HEAD(&s->inflight_aio_head, aio_req, aio_siblings);
add_aio_request(s, aio_req, acb->qiov->iov, acb->qiov->niov,
acb->aiocb_type);
}
}
static coroutine_fn void reconnect_to_sdog(void *opaque)
{
BDRVSheepdogState *s = opaque;
@ -840,12 +822,6 @@ static void coroutine_fn aio_read_response(void *opaque)
s->max_dirty_data_idx = MAX(idx, s->max_dirty_data_idx);
s->min_dirty_data_idx = MIN(idx, s->min_dirty_data_idx);
}
/*
* Some requests may be blocked because simultaneous
* create requests are not allowed, so we search the
* pending requests here.
*/
send_pending_req(s, aio_req->oid);
}
break;
case AIOCB_READ_UDATA:
@ -1341,30 +1317,6 @@ out:
return ret;
}
/* Return true if the specified request is linked to the pending list. */
static bool check_simultaneous_create(BDRVSheepdogState *s, AIOReq *aio_req)
{
AIOReq *areq;
QLIST_FOREACH(areq, &s->inflight_aio_head, aio_siblings) {
if (areq != aio_req && areq->oid == aio_req->oid) {
/*
* Sheepdog cannot handle simultaneous create requests to the same
* object, so we cannot send the request until the previous request
* finishes.
*/
DPRINTF("simultaneous create to %" PRIx64 "\n", aio_req->oid);
aio_req->flags = 0;
aio_req->base_oid = 0;
aio_req->create = false;
QLIST_REMOVE(aio_req, aio_siblings);
QLIST_INSERT_HEAD(&s->pending_aio_head, aio_req, aio_siblings);
return true;
}
}
return false;
}
static void coroutine_fn resend_aioreq(BDRVSheepdogState *s, AIOReq *aio_req)
{
SheepdogAIOCB *acb = aio_req->aiocb;
@ -1379,10 +1331,6 @@ static void coroutine_fn resend_aioreq(BDRVSheepdogState *s, AIOReq *aio_req)
goto out;
}
if (check_simultaneous_create(s, aio_req)) {
return;
}
if (s->inode.data_vdi_id[idx]) {
aio_req->base_oid = vid_to_data_oid(s->inode.data_vdi_id[idx], idx);
aio_req->flags |= SD_FLAG_CMD_COW;
@ -1458,8 +1406,8 @@ static int sd_open(BlockDriverState *bs, QDict *options, int flags,
filename = qemu_opt_get(opts, "filename");
QLIST_INIT(&s->inflight_aio_head);
QLIST_INIT(&s->pending_aio_head);
QLIST_INIT(&s->failed_aio_head);
QLIST_INIT(&s->inflight_aiocb_head);
s->fd = -1;
memset(vdi, 0, sizeof(vdi));
@ -1524,6 +1472,7 @@ static int sd_open(BlockDriverState *bs, QDict *options, int flags,
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_opts_del(opts);
g_free(buf);
return 0;
@ -2195,12 +2144,6 @@ static int coroutine_fn sd_co_rw_vector(void *p)
old_oid, done);
QLIST_INSERT_HEAD(&s->inflight_aio_head, aio_req, aio_siblings);
if (create) {
if (check_simultaneous_create(s, aio_req)) {
goto done;
}
}
add_aio_request(s, aio_req, acb->qiov->iov, acb->qiov->niov,
acb->aiocb_type);
done:
@ -2215,6 +2158,20 @@ out:
return 1;
}
static bool check_overwrapping_aiocb(BDRVSheepdogState *s, SheepdogAIOCB *aiocb)
{
SheepdogAIOCB *cb;
QLIST_FOREACH(cb, &s->inflight_aiocb_head, aiocb_siblings) {
if (AIOCBOverwrapping(aiocb, cb)) {
return true;
}
}
QLIST_INSERT_HEAD(&s->inflight_aiocb_head, aiocb, aiocb_siblings);
return false;
}
static coroutine_fn int sd_co_writev(BlockDriverState *bs, int64_t sector_num,
int nb_sectors, QEMUIOVector *qiov)
{
@ -2234,14 +2191,25 @@ static coroutine_fn int sd_co_writev(BlockDriverState *bs, int64_t sector_num,
acb->aio_done_func = sd_write_done;
acb->aiocb_type = AIOCB_WRITE_UDATA;
retry:
if (check_overwrapping_aiocb(s, acb)) {
qemu_co_queue_wait(&s->overwrapping_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_aio_unref(acb);
return ret;
}
qemu_coroutine_yield();
QLIST_REMOVE(acb, aiocb_siblings);
qemu_co_queue_restart_all(&s->overwrapping_queue);
return acb->ret;
}
@ -2250,19 +2218,30 @@ static coroutine_fn int sd_co_readv(BlockDriverState *bs, int64_t sector_num,
{
SheepdogAIOCB *acb;
int ret;
BDRVSheepdogState *s = bs->opaque;
acb = sd_aio_setup(bs, qiov, sector_num, nb_sectors);
acb->aiocb_type = AIOCB_READ_UDATA;
acb->aio_done_func = sd_finish_aiocb;
retry:
if (check_overwrapping_aiocb(s, acb)) {
qemu_co_queue_wait(&s->overwrapping_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_aio_unref(acb);
return ret;
}
qemu_coroutine_yield();
QLIST_REMOVE(acb, aiocb_siblings);
qemu_co_queue_restart_all(&s->overwrapping_queue);
return acb->ret;
}
@ -2610,14 +2589,25 @@ static coroutine_fn int sd_co_discard(BlockDriverState *bs, int64_t sector_num,
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);
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_aio_unref(acb);
return ret;
}
qemu_coroutine_yield();
QLIST_REMOVE(acb, aiocb_siblings);
qemu_co_queue_restart_all(&s->overwrapping_queue);
return acb->ret;
}

2
block/ssh.c
View File

@ -563,7 +563,7 @@ static int connect_to_ssh(BDRVSSHState *s, QDict *options,
/* Open the socket and connect. */
s->sock = inet_connect(s->hostport, errp);
if (s->sock < 0) {
ret = -errno;
ret = -EIO;
goto err;
}