block: generate coroutine-wrapper code

Use code generation implemented in previous commit to generated
coroutine wrappers in block.c and block/io.c

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-Id: <20200924185414.28642-6-vsementsov@virtuozzo.com>

2 files changed, 3 insertions, 215 deletions

diff --git a/block/coroutines.h b/block/coroutines.h
index 9ce1730..c62b3a2 100644
--- a/block/coroutines.h
+++ b/block/coroutines.h
@@ -34,7 +34,7 @@ int coroutine_fn bdrv_co_invalidate_cache(BlockDriverState *bs, Error **errp);
 int coroutine_fn
 bdrv_co_prwv(BdrvChild *child, int64_t offset, QEMUIOVector *qiov,
              bool is_write, BdrvRequestFlags flags);
-int
+int generated_co_wrapper
 bdrv_prwv(BdrvChild *child, int64_t offset, QEMUIOVector *qiov,
           bool is_write, BdrvRequestFlags flags);
 
@@ -47,7 +47,7 @@ bdrv_co_common_block_status_above(BlockDriverState *bs,
                                   int64_t *pnum,
                                   int64_t *map,
                                   BlockDriverState **file);
-int
+int generated_co_wrapper
 bdrv_common_block_status_above(BlockDriverState *bs,
                                BlockDriverState *base,
                                bool want_zero,
@@ -60,7 +60,7 @@ bdrv_common_block_status_above(BlockDriverState *bs,
 int coroutine_fn
 bdrv_co_rw_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos,
                    bool is_read);
-int
+int generated_co_wrapper
 bdrv_rw_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos,
                 bool is_read);
 
diff --git a/block/io.c b/block/io.c
index 55b3b76..2891303 100644
--- a/block/io.c
+++ b/block/io.c
@@ -890,50 +890,6 @@ static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset,
     return 0;
 }
 
-typedef int coroutine_fn BdrvRequestEntry(void *opaque);
-typedef struct BdrvRunCo {
-    BdrvRequestEntry *entry;
-    void *opaque;
-    int ret;
-    bool done;
-    Coroutine *co; /* Coroutine, running bdrv_run_co_entry, for debugging */
-} BdrvRunCo;
-
-static void coroutine_fn bdrv_run_co_entry(void *opaque)
-{
-    BdrvRunCo *arg = opaque;
-
-    arg->ret = arg->entry(arg->opaque);
-    arg->done = true;
-    aio_wait_kick();
-}
-
-static int bdrv_run_co(BlockDriverState *bs, BdrvRequestEntry *entry,
-                       void *opaque)
-{
-    if (qemu_in_coroutine()) {
-        /* Fast-path if already in coroutine context */
-        return entry(opaque);
-    } else {
-        BdrvRunCo s = { .entry = entry, .opaque = opaque };
-
-        s.co = qemu_coroutine_create(bdrv_run_co_entry, &s);
-        bdrv_coroutine_enter(bs, s.co);
-
-        BDRV_POLL_WHILE(bs, !s.done);
-
-        return s.ret;
-    }
-}
-
-typedef struct RwCo {
-    BdrvChild *child;
-    int64_t offset;
-    QEMUIOVector *qiov;
-    bool is_write;
-    BdrvRequestFlags flags;
-} RwCo;
-
 int coroutine_fn bdrv_co_prwv(BdrvChild *child, int64_t offset,
                               QEMUIOVector *qiov, bool is_write,
                               BdrvRequestFlags flags)
@@ -945,32 +901,6 @@ int coroutine_fn bdrv_co_prwv(BdrvChild *child, int64_t offset,
     }
 }
 
-static int coroutine_fn bdrv_rw_co_entry(void *opaque)
-{
-    RwCo *rwco = opaque;
-
-    return bdrv_co_prwv(rwco->child, rwco->offset, rwco->qiov,
-                        rwco->is_write, rwco->flags);
-}
-
-/*
- * Process a vectored synchronous request using coroutines
- */
-int bdrv_prwv(BdrvChild *child, int64_t offset,
-              QEMUIOVector *qiov, bool is_write,
-              BdrvRequestFlags flags)
-{
-    RwCo rwco = {
-        .child = child,
-        .offset = offset,
-        .qiov = qiov,
-        .is_write = is_write,
-        .flags = flags,
-    };
-
-    return bdrv_run_co(child->bs, bdrv_rw_co_entry, &rwco);
-}
-
 int bdrv_pwrite_zeroes(BdrvChild *child, int64_t offset,
                        int bytes, BdrvRequestFlags flags)
 {
@@ -2247,18 +2177,6 @@ int bdrv_flush_all(void)
     return result;
 }
 
-
-typedef struct BdrvCoBlockStatusData {
-    BlockDriverState *bs;
-    BlockDriverState *base;
-    bool want_zero;
-    int64_t offset;
-    int64_t bytes;
-    int64_t *pnum;
-    int64_t *map;
-    BlockDriverState **file;
-} BdrvCoBlockStatusData;
-
 /*
  * Returns the allocation status of the specified sectors.
  * Drivers not implementing the functionality are assumed to not support
@@ -2494,43 +2412,6 @@ bdrv_co_common_block_status_above(BlockDriverState *bs,
     return ret;
 }
 
-/* Coroutine wrapper for bdrv_block_status_above() */
-static int coroutine_fn bdrv_block_status_above_co_entry(void *opaque)
-{
-    BdrvCoBlockStatusData *data = opaque;
-
-    return bdrv_co_common_block_status_above(data->bs, data->base,
-                                             data->want_zero,
-                                             data->offset, data->bytes,
-                                             data->pnum, data->map, data->file);
-}
-
-/*
- * Synchronous wrapper around bdrv_co_block_status_above().
- *
- * See bdrv_co_block_status_above() for details.
- */
-int bdrv_common_block_status_above(BlockDriverState *bs,
-                                   BlockDriverState *base,
-                                   bool want_zero, int64_t offset,
-                                   int64_t bytes, int64_t *pnum,
-                                   int64_t *map,
-                                   BlockDriverState **file)
-{
-    BdrvCoBlockStatusData data = {
-        .bs = bs,
-        .base = base,
-        .want_zero = want_zero,
-        .offset = offset,
-        .bytes = bytes,
-        .pnum = pnum,
-        .map = map,
-        .file = file,
-    };
-
-    return bdrv_run_co(bs, bdrv_block_status_above_co_entry, &data);
-}
-
 int bdrv_block_status_above(BlockDriverState *bs, BlockDriverState *base,
                             int64_t offset, int64_t bytes, int64_t *pnum,
                             int64_t *map, BlockDriverState **file)
@@ -2624,13 +2505,6 @@ int bdrv_is_allocated_above(BlockDriverState *top,
     return 0;
 }
 
-typedef struct BdrvVmstateCo {
-    BlockDriverState    *bs;
-    QEMUIOVector        *qiov;
-    int64_t             pos;
-    bool                is_read;
-} BdrvVmstateCo;
-
 int coroutine_fn
 bdrv_co_rw_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos,
                    bool is_read)
@@ -2657,26 +2531,6 @@ bdrv_co_rw_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos,
     return ret;
 }
 
-static int coroutine_fn bdrv_co_rw_vmstate_entry(void *opaque)
-{
-    BdrvVmstateCo *co = opaque;
-
-    return bdrv_co_rw_vmstate(co->bs, co->qiov, co->pos, co->is_read);
-}
-
-int bdrv_rw_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos,
-                    bool is_read)
-{
-    BdrvVmstateCo data = {
-        .bs         = bs,
-        .qiov       = qiov,
-        .pos        = pos,
-        .is_read    = is_read,
-    };
-
-    return bdrv_run_co(bs, bdrv_co_rw_vmstate_entry, &data);
-}
-
 int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf,
                       int64_t pos, int size)
 {
@@ -2752,11 +2606,6 @@ void bdrv_aio_cancel_async(BlockAIOCB *acb)
 /**************************************************************/
 /* Coroutine block device emulation */
 
-static int coroutine_fn bdrv_flush_co_entry(void *opaque)
-{
-    return bdrv_co_flush(opaque);
-}
-
 int coroutine_fn bdrv_co_flush(BlockDriverState *bs)
 {
     BdrvChild *primary_child = bdrv_primary_child(bs);
@@ -2880,24 +2729,6 @@ early_exit:
     return ret;
 }
 
-int bdrv_flush(BlockDriverState *bs)
-{
-    return bdrv_run_co(bs, bdrv_flush_co_entry, bs);
-}
-
-typedef struct DiscardCo {
-    BdrvChild *child;
-    int64_t offset;
-    int64_t bytes;
-} DiscardCo;
-
-static int coroutine_fn bdrv_pdiscard_co_entry(void *opaque)
-{
-    DiscardCo *rwco = opaque;
-
-    return bdrv_co_pdiscard(rwco->child, rwco->offset, rwco->bytes);
-}
-
 int coroutine_fn bdrv_co_pdiscard(BdrvChild *child, int64_t offset,
                                   int64_t bytes)
 {
@@ -3012,17 +2843,6 @@ out:
     return ret;
 }
 
-int bdrv_pdiscard(BdrvChild *child, int64_t offset, int64_t bytes)
-{
-    DiscardCo rwco = {
-        .child = child,
-        .offset = offset,
-        .bytes = bytes,
-    };
-
-    return bdrv_run_co(child->bs, bdrv_pdiscard_co_entry, &rwco);
-}
-
 int bdrv_co_ioctl(BlockDriverState *bs, int req, void *buf)
 {
     BlockDriver *drv = bs->drv;
@@ -3424,35 +3244,3 @@ out:
 
     return ret;
 }
-
-typedef struct TruncateCo {
-    BdrvChild *child;
-    int64_t offset;
-    bool exact;
-    PreallocMode prealloc;
-    BdrvRequestFlags flags;
-    Error **errp;
-} TruncateCo;
-
-static int coroutine_fn bdrv_truncate_co_entry(void *opaque)
-{
-    TruncateCo *tco = opaque;
-
-    return bdrv_co_truncate(tco->child, tco->offset, tco->exact,
-                            tco->prealloc, tco->flags, tco->errp);
-}
-
-int bdrv_truncate(BdrvChild *child, int64_t offset, bool exact,
-                  PreallocMode prealloc, BdrvRequestFlags flags, Error **errp)
-{
-    TruncateCo tco = {
-        .child      = child,
-        .offset     = offset,
-        .exact      = exact,
-        .prealloc   = prealloc,
-        .flags      = flags,
-        .errp       = errp,
-    };
-
-    return bdrv_run_co(child->bs, bdrv_truncate_co_entry, &tco);
-}