[PATCH v6 2/4] block: introduce zone append write for zoned devices

[Sam Li <faithilikerun@gmail.com>]

A zone append command is a write operation that specifies the first
logical block of a zone as the write position. When writing to a zoned
block device using zone append, the byte offset of writes is pointing
to the write pointer of that zone. Upon completion the device will
respond with the position the data has been written in the zone.

Signed-off-by: Sam Li <faithilikerun@gmail.com>
---
 block/block-backend.c             | 60 +++++++++++++++++++++++++++++++
 block/file-posix.c                | 54 +++++++++++++++++++++++++---
 block/io.c                        | 21 +++++++++++
 block/io_uring.c                  |  4 +++
 block/linux-aio.c                 |  3 ++
 block/raw-format.c                |  8 +++++
 include/block/block-io.h          |  4 +++
 include/block/block_int-common.h  |  5 +++
 include/block/raw-aio.h           |  4 ++-
 include/sysemu/block-backend-io.h |  9 +++++
 10 files changed, 166 insertions(+), 6 deletions(-)

diff --git a/block/block-backend.c b/block/block-backend.c
index f70b08e3f6..28e8f5d778 100644
--- a/block/block-backend.c
+++ b/block/block-backend.c
@@ -1888,6 +1888,45 @@ BlockAIOCB *blk_aio_zone_mgmt(BlockBackend *blk, BlockZoneOp op,
     return &acb->common;
 }
 
+static void coroutine_fn blk_aio_zone_append_entry(void *opaque)
+{
+    BlkAioEmAIOCB *acb = opaque;
+    BlkRwCo *rwco = &acb->rwco;
+
+    rwco->ret = blk_co_zone_append(rwco->blk, &acb->bytes,
+                                   rwco->iobuf, rwco->flags);
+    blk_aio_complete(acb);
+}
+
+BlockAIOCB *blk_aio_zone_append(BlockBackend *blk, int64_t *offset,
+                                QEMUIOVector *qiov, BdrvRequestFlags flags,
+                                BlockCompletionFunc *cb, void *opaque) {
+    BlkAioEmAIOCB *acb;
+    Coroutine *co;
+    IO_CODE();
+
+    blk_inc_in_flight(blk);
+    acb = blk_aio_get(&blk_aio_em_aiocb_info, blk, cb, opaque);
+    acb->rwco = (BlkRwCo) {
+        .blk    = blk,
+        .ret    = NOT_DONE,
+        .flags  = flags,
+        .iobuf  = qiov,
+    };
+    acb->bytes = *offset;
+    acb->has_returned = false;
+
+    co = qemu_coroutine_create(blk_aio_zone_append_entry, acb);
+    aio_co_enter(blk_get_aio_context(blk), co);
+    acb->has_returned = true;
+    if (acb->rwco.ret != NOT_DONE) {
+        replay_bh_schedule_oneshot_event(blk_get_aio_context(blk),
+                                         blk_aio_complete_bh, acb);
+    }
+
+    return &acb->common;
+}
+
 /*
  * Send a zone_report command.
  * offset is a byte offset from the start of the device. No alignment
@@ -1939,6 +1978,27 @@ int coroutine_fn blk_co_zone_mgmt(BlockBackend *blk, BlockZoneOp op,
     return ret;
 }
 
+/*
+ * Send a zone_append command.
+ */
+int coroutine_fn blk_co_zone_append(BlockBackend *blk, int64_t *offset,
+        QEMUIOVector *qiov, BdrvRequestFlags flags)
+{
+    int ret;
+    IO_CODE();
+
+    blk_inc_in_flight(blk);
+    blk_wait_while_drained(blk);
+    if (!blk_is_available(blk)) {
+        blk_dec_in_flight(blk);
+        return -ENOMEDIUM;
+    }
+
+    ret = bdrv_co_zone_append(blk_bs(blk), offset, qiov, flags);
+    blk_dec_in_flight(blk);
+    return ret;
+}
+
 void blk_drain(BlockBackend *blk)
 {
     BlockDriverState *bs = blk_bs(blk);
diff --git a/block/file-posix.c b/block/file-posix.c
index 61ed769ac8..2ba9174778 100644
--- a/block/file-posix.c
+++ b/block/file-posix.c
@@ -160,6 +160,7 @@ typedef struct BDRVRawState {
     bool has_write_zeroes:1;
     bool use_linux_aio:1;
     bool use_linux_io_uring:1;
+    int64_t *offset; /* offset of zone append operation */
     int page_cache_inconsistent; /* errno from fdatasync failure */
     bool has_fallocate;
     bool needs_alignment;
@@ -1672,7 +1673,7 @@ static ssize_t handle_aiocb_rw_vector(RawPosixAIOData *aiocb)
     ssize_t len;
 
     len = RETRY_ON_EINTR(
-        (aiocb->aio_type & QEMU_AIO_WRITE) ?
+        (aiocb->aio_type & (QEMU_AIO_WRITE | QEMU_AIO_ZONE_APPEND)) ?
             qemu_pwritev(aiocb->aio_fildes,
                            aiocb->io.iov,
                            aiocb->io.niov,
@@ -1701,7 +1702,7 @@ static ssize_t handle_aiocb_rw_linear(RawPosixAIOData *aiocb, char *buf)
     ssize_t len;
 
     while (offset < aiocb->aio_nbytes) {
-        if (aiocb->aio_type & QEMU_AIO_WRITE) {
+        if (aiocb->aio_type & (QEMU_AIO_WRITE | QEMU_AIO_ZONE_APPEND)) {
             len = pwrite(aiocb->aio_fildes,
                          (const char *)buf + offset,
                          aiocb->aio_nbytes - offset,
@@ -1794,7 +1795,7 @@ static int handle_aiocb_rw(void *opaque)
     }
 
     nbytes = handle_aiocb_rw_linear(aiocb, buf);
-    if (!(aiocb->aio_type & QEMU_AIO_WRITE)) {
+    if (!(aiocb->aio_type & (QEMU_AIO_WRITE | QEMU_AIO_ZONE_APPEND))) {
         char *p = buf;
         size_t count = aiocb->aio_nbytes, copy;
         int i;
@@ -2431,6 +2432,10 @@ static int coroutine_fn raw_co_prw(BlockDriverState *bs, uint64_t offset,
 #if defined(CONFIG_BLKZONED)
     if (bs->bl.wps) {
         qemu_co_mutex_lock(&bs->bl.wps->colock);
+        if (type & QEMU_AIO_ZONE_APPEND && bs->bl.zone_size) {
+            int index = offset / bs->bl.zone_size;
+            offset = bs->bl.wps->wp[index];
+        }
     }
 #endif
 
@@ -2478,9 +2483,13 @@ out:
 #if defined(CONFIG_BLKZONED)
     BlockZoneWps *wps = bs->bl.wps;
     if (ret == 0) {
-        if (type & QEMU_AIO_WRITE && wps && bs->bl.zone_size) {
+        if ((type & (QEMU_AIO_WRITE | QEMU_AIO_ZONE_APPEND))
+            && wps && bs->bl.zone_size) {
             int index = offset / bs->bl.zone_size;
             if (!BDRV_ZT_IS_CONV(wps->wp[index])) {
+                if (type & QEMU_AIO_ZONE_APPEND) {
+                    *s->offset = wps->wp[index];
+                }
                 /* Advance the wp if needed */
                 if (offset + bytes > wps->wp[index]) {
                     wps->wp[index] = offset + bytes;
@@ -2488,7 +2497,7 @@ out:
             }
         }
     } else {
-        if (type & QEMU_AIO_WRITE) {
+        if (type & (QEMU_AIO_WRITE | QEMU_AIO_ZONE_APPEND)) {
             update_zones_wp(s->fd, bs->bl.wps, 0, 1);
         }
     }
@@ -3498,6 +3507,40 @@ out:
 }
 #endif
 
+#if defined(CONFIG_BLKZONED)
+static int coroutine_fn raw_co_zone_append(BlockDriverState *bs,
+                                           int64_t *offset,
+                                           QEMUIOVector *qiov,
+                                           BdrvRequestFlags flags) {
+    assert(flags == 0);
+    int64_t zone_size_mask = bs->bl.zone_size - 1;
+    int64_t iov_len = 0;
+    int64_t len = 0;
+    BDRVRawState *s = bs->opaque;
+    s->offset = offset;
+
+    if (*offset & zone_size_mask) {
+        error_report("sector offset %" PRId64 " is not aligned to zone size "
+                     "%" PRId32 "", *offset / 512, bs->bl.zone_size / 512);
+        return -EINVAL;
+    }
+
+    int64_t wg = bs->bl.write_granularity;
+    int64_t wg_mask = wg - 1;
+    for (int i = 0; i < qiov->niov; i++) {
+        iov_len = qiov->iov[i].iov_len;
+        if (iov_len & wg_mask) {
+            error_report("len of IOVector[%d] %" PRId64 " is not aligned to "
+                         "block size %" PRId64 "", i, iov_len, wg);
+            return -EINVAL;
+        }
+        len += iov_len;
+    }
+
+    return raw_co_prw(bs, *offset, len, qiov, QEMU_AIO_ZONE_APPEND);
+}
+#endif
+
 static coroutine_fn int
 raw_do_pdiscard(BlockDriverState *bs, int64_t offset, int64_t bytes,
                 bool blkdev)
@@ -4259,6 +4302,7 @@ static BlockDriver bdrv_host_device = {
     /* zone management operations */
     .bdrv_co_zone_report = raw_co_zone_report,
     .bdrv_co_zone_mgmt = raw_co_zone_mgmt,
+    .bdrv_co_zone_append = raw_co_zone_append,
 #endif
 };
 
diff --git a/block/io.c b/block/io.c
index 5dbf1e50f2..fe9cabaaf6 100644
--- a/block/io.c
+++ b/block/io.c
@@ -3152,6 +3152,27 @@ out:
     return co.ret;
 }
 
+int coroutine_fn bdrv_co_zone_append(BlockDriverState *bs, int64_t *offset,
+                        QEMUIOVector *qiov,
+                        BdrvRequestFlags flags)
+{
+    BlockDriver *drv = bs->drv;
+    CoroutineIOCompletion co = {
+            .coroutine = qemu_coroutine_self(),
+    };
+    IO_CODE();
+
+    bdrv_inc_in_flight(bs);
+    if (!drv || !drv->bdrv_co_zone_append || bs->bl.zoned == BLK_Z_NONE) {
+        co.ret = -ENOTSUP;
+        goto out;
+    }
+    co.ret = drv->bdrv_co_zone_append(bs, offset, qiov, flags);
+out:
+    bdrv_dec_in_flight(bs);
+    return co.ret;
+}
+
 void *qemu_blockalign(BlockDriverState *bs, size_t size)
 {
     IO_CODE();
diff --git a/block/io_uring.c b/block/io_uring.c
index 973e15d876..f7488c241a 100644
--- a/block/io_uring.c
+++ b/block/io_uring.c
@@ -345,6 +345,10 @@ static int luring_do_submit(int fd, LuringAIOCB *luringcb, LuringState *s,
         io_uring_prep_writev(sqes, fd, luringcb->qiov->iov,
                              luringcb->qiov->niov, offset);
         break;
+    case QEMU_AIO_ZONE_APPEND:
+        io_uring_prep_writev(sqes, fd, luringcb->qiov->iov,
+                             luringcb->qiov->niov, offset);
+        break;
     case QEMU_AIO_READ:
         io_uring_prep_readv(sqes, fd, luringcb->qiov->iov,
                             luringcb->qiov->niov, offset);
diff --git a/block/linux-aio.c b/block/linux-aio.c
index d2cfb7f523..1959834156 100644
--- a/block/linux-aio.c
+++ b/block/linux-aio.c
@@ -389,6 +389,9 @@ static int laio_do_submit(int fd, struct qemu_laiocb *laiocb, off_t offset,
     case QEMU_AIO_WRITE:
         io_prep_pwritev(iocbs, fd, qiov->iov, qiov->niov, offset);
         break;
+    case QEMU_AIO_ZONE_APPEND:
+        io_prep_pwritev(iocbs, fd, qiov->iov, qiov->niov, offset);
+        break;
     case QEMU_AIO_READ:
         io_prep_preadv(iocbs, fd, qiov->iov, qiov->niov, offset);
         break;
diff --git a/block/raw-format.c b/block/raw-format.c
index 72e23e7b55..64e7d48d04 100644
--- a/block/raw-format.c
+++ b/block/raw-format.c
@@ -332,6 +332,13 @@ raw_co_zone_mgmt(BlockDriverState *bs, BlockZoneOp op,
     return bdrv_co_zone_mgmt(bs->file->bs, op, offset, len);
 }
 
+static int coroutine_fn GRAPH_RDLOCK
+raw_co_zone_append(BlockDriverState *bs,int64_t *offset, QEMUIOVector *qiov,
+                   BdrvRequestFlags flags)
+{
+    return bdrv_co_zone_append(bs->file->bs, offset, qiov, flags);
+}
+
 static int64_t coroutine_fn GRAPH_RDLOCK
 raw_co_getlength(BlockDriverState *bs)
 {
@@ -635,6 +642,7 @@ BlockDriver bdrv_raw = {
     .bdrv_co_pdiscard     = &raw_co_pdiscard,
     .bdrv_co_zone_report  = &raw_co_zone_report,
     .bdrv_co_zone_mgmt  = &raw_co_zone_mgmt,
+    .bdrv_co_zone_append = &raw_co_zone_append,
     .bdrv_co_block_status = &raw_co_block_status,
     .bdrv_co_copy_range_from = &raw_co_copy_range_from,
     .bdrv_co_copy_range_to  = &raw_co_copy_range_to,
diff --git a/include/block/block-io.h b/include/block/block-io.h
index 19d1fad9cf..55fca02991 100644
--- a/include/block/block-io.h
+++ b/include/block/block-io.h
@@ -120,6 +120,10 @@ int coroutine_fn GRAPH_RDLOCK bdrv_co_zone_report(BlockDriverState *bs,
 int coroutine_fn GRAPH_RDLOCK bdrv_co_zone_mgmt(BlockDriverState *bs,
                                                 BlockZoneOp op,
                                                 int64_t offset, int64_t len);
+int coroutine_fn GRAPH_RDLOCK bdrv_co_zone_append(BlockDriverState *bs,
+                                                  int64_t *offset,
+                                                  QEMUIOVector *qiov,
+                                                  BdrvRequestFlags flags);
 
 bool bdrv_can_write_zeroes_with_unmap(BlockDriverState *bs);
 int bdrv_block_status(BlockDriverState *bs, int64_t offset,
diff --git a/include/block/block_int-common.h b/include/block/block_int-common.h
index 19915b34af..ccd8811919 100644
--- a/include/block/block_int-common.h
+++ b/include/block/block_int-common.h
@@ -724,6 +724,9 @@ struct BlockDriver {
             BlockZoneDescriptor *zones);
     int coroutine_fn (*bdrv_co_zone_mgmt)(BlockDriverState *bs, BlockZoneOp op,
             int64_t offset, int64_t len);
+    int coroutine_fn (*bdrv_co_zone_append)(BlockDriverState *bs,
+            int64_t *offset, QEMUIOVector *qiov,
+            BdrvRequestFlags flags);
 
     /* removable device specific */
     bool coroutine_fn GRAPH_RDLOCK_PTR (*bdrv_co_is_inserted)(
@@ -887,6 +890,8 @@ typedef struct BlockLimits {
 
     /* array of write pointers' location of each zone in the zoned device. */
     BlockZoneWps *wps;
+
+    int64_t write_granularity;
 } BlockLimits;
 
 typedef struct BdrvOpBlocker BdrvOpBlocker;
diff --git a/include/block/raw-aio.h b/include/block/raw-aio.h
index eda6a7a253..fb9c9f5a01 100644
--- a/include/block/raw-aio.h
+++ b/include/block/raw-aio.h
@@ -30,6 +30,7 @@
 #define QEMU_AIO_TRUNCATE     0x0080
 #define QEMU_AIO_ZONE_REPORT  0x0100
 #define QEMU_AIO_ZONE_MGMT    0x0200
+#define QEMU_AIO_ZONE_APPEND  0x0400
 #define QEMU_AIO_TYPE_MASK \
         (QEMU_AIO_READ | \
          QEMU_AIO_WRITE | \
@@ -40,7 +41,8 @@
          QEMU_AIO_COPY_RANGE | \
          QEMU_AIO_TRUNCATE | \
          QEMU_AIO_ZONE_REPORT | \
-         QEMU_AIO_ZONE_MGMT)
+         QEMU_AIO_ZONE_MGMT | \
+         QEMU_AIO_ZONE_APPEND)
 
 /* AIO flags */
 #define QEMU_AIO_MISALIGNED   0x1000
diff --git a/include/sysemu/block-backend-io.h b/include/sysemu/block-backend-io.h
index f575ab5b6b..e716591a1a 100644
--- a/include/sysemu/block-backend-io.h
+++ b/include/sysemu/block-backend-io.h
@@ -53,6 +53,9 @@ BlockAIOCB *blk_aio_zone_report(BlockBackend *blk, int64_t offset,
 BlockAIOCB *blk_aio_zone_mgmt(BlockBackend *blk, BlockZoneOp op,
                               int64_t offset, int64_t len,
                               BlockCompletionFunc *cb, void *opaque);
+BlockAIOCB *blk_aio_zone_append(BlockBackend *blk, int64_t *offset,
+                                QEMUIOVector *qiov, BdrvRequestFlags flags,
+                                BlockCompletionFunc *cb, void *opaque);
 BlockAIOCB *blk_aio_pdiscard(BlockBackend *blk, int64_t offset, int64_t bytes,
                              BlockCompletionFunc *cb, void *opaque);
 void blk_aio_cancel_async(BlockAIOCB *acb);
@@ -201,6 +204,12 @@ int coroutine_fn blk_co_zone_mgmt(BlockBackend *blk, BlockZoneOp op,
                                   int64_t offset, int64_t len);
 int co_wrapper_mixed blk_zone_mgmt(BlockBackend *blk, BlockZoneOp op,
                                        int64_t offset, int64_t len);
+int coroutine_fn blk_co_zone_append(BlockBackend *blk, int64_t *offset,
+                                    QEMUIOVector *qiov,
+                                    BdrvRequestFlags flags);
+int co_wrapper_mixed blk_zone_append(BlockBackend *blk, int64_t *offset,
+                                         QEMUIOVector *qiov,
+                                         BdrvRequestFlags flags);
 
 int co_wrapper_mixed blk_pdiscard(BlockBackend *blk, int64_t offset,
                                   int64_t bytes);
-- 
2.39.2