[Qemu-devel] [PATCH v6 01/16] block: switch blk_write_compressed() to byte-based interface

["Denis V. Lunev" <den@openvz.org>]

From: Pavel Butsykin <pbutsykin@virtuozzo.com>

This is a preparatory patch, which continues the general trend of the
transition to the byte-based interfaces. bdrv_check_request() and
blk_check_requestis no longer used, so we can remove.

Signed-off-by: Pavel Butsykin <pbutsykin@virtuozzo.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Denis V. Lunev <den@openvz.org>
CC: Jeff Cody <jcody@redhat.com>
CC: Markus Armbruster <armbru@redhat.com>
CC: Eric Blake <eblake@redhat.com>
CC: John Snow <jsnow@redhat.com>
CC: Stefan Hajnoczi <stefanha@redhat.com>
CC: Kevin Wolf <kwolf@redhat.com>
---
 block/block-backend.c          | 23 ++++-------------------
 block/io.c                     | 22 +++++++---------------
 include/block/block.h          |  4 ++--
 include/sysemu/block-backend.h |  4 ++--
 qemu-img.c                     |  6 ++++--
 qemu-io-cmds.c                 |  2 +-
 6 files changed, 20 insertions(+), 41 deletions(-)

diff --git a/block/block-backend.c b/block/block-backend.c
index effa038..8f38ab4 100644
--- a/block/block-backend.c
+++ b/block/block-backend.c
@@ -727,21 +727,6 @@ static int blk_check_byte_request(BlockBackend *blk, int64_t offset,
     return 0;
 }
 
-static int blk_check_request(BlockBackend *blk, int64_t sector_num,
-                             int nb_sectors)
-{
-    if (sector_num < 0 || sector_num > INT64_MAX / BDRV_SECTOR_SIZE) {
-        return -EIO;
-    }
-
-    if (nb_sectors < 0 || nb_sectors > INT_MAX / BDRV_SECTOR_SIZE) {
-        return -EIO;
-    }
-
-    return blk_check_byte_request(blk, sector_num * BDRV_SECTOR_SIZE,
-                                  nb_sectors * BDRV_SECTOR_SIZE);
-}
-
 int coroutine_fn blk_co_preadv(BlockBackend *blk, int64_t offset,
                                unsigned int bytes, QEMUIOVector *qiov,
                                BdrvRequestFlags flags)
@@ -1484,15 +1469,15 @@ int coroutine_fn blk_co_pwrite_zeroes(BlockBackend *blk, int64_t offset,
                           flags | BDRV_REQ_ZERO_WRITE);
 }
 
-int blk_write_compressed(BlockBackend *blk, int64_t sector_num,
-                         const uint8_t *buf, int nb_sectors)
+int blk_pwrite_compressed(BlockBackend *blk, int64_t offset, const void *buf,
+                          int count)
 {
-    int ret = blk_check_request(blk, sector_num, nb_sectors);
+    int ret = blk_check_byte_request(blk, offset, count);
     if (ret < 0) {
         return ret;
     }
 
-    return bdrv_write_compressed(blk_bs(blk), sector_num, buf, nb_sectors);
+    return bdrv_pwrite_compressed(blk_bs(blk), offset, buf, count);
 }
 
 int blk_truncate(BlockBackend *blk, int64_t offset)
diff --git a/block/io.c b/block/io.c
index 7323f0f..e9f35c6 100644
--- a/block/io.c
+++ b/block/io.c
@@ -540,17 +540,6 @@ static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset,
     return 0;
 }
 
-static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num,
-                              int nb_sectors)
-{
-    if (nb_sectors < 0 || nb_sectors > BDRV_REQUEST_MAX_SECTORS) {
-        return -EIO;
-    }
-
-    return bdrv_check_byte_request(bs, sector_num * BDRV_SECTOR_SIZE,
-                                   nb_sectors * BDRV_SECTOR_SIZE);
-}
-
 typedef struct RwCo {
     BdrvChild *child;
     int64_t offset;
@@ -1878,8 +1867,8 @@ int bdrv_is_allocated_above(BlockDriverState *top,
     return 0;
 }
 
-int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
-                          const uint8_t *buf, int nb_sectors)
+int bdrv_pwrite_compressed(BlockDriverState *bs, int64_t offset,
+                           const void *buf, int bytes)
 {
     BlockDriver *drv = bs->drv;
     int ret;
@@ -1890,14 +1879,17 @@ int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
     if (!drv->bdrv_write_compressed) {
         return -ENOTSUP;
     }
-    ret = bdrv_check_request(bs, sector_num, nb_sectors);
+    ret = bdrv_check_byte_request(bs, offset, bytes);
     if (ret < 0) {
         return ret;
     }
 
     assert(QLIST_EMPTY(&bs->dirty_bitmaps));
+    assert((offset & (BDRV_SECTOR_SIZE - 1)) == 0);
+    assert((bytes & (BDRV_SECTOR_SIZE - 1)) == 0);
 
-    return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors);
+    return drv->bdrv_write_compressed(bs, offset >> BDRV_SECTOR_BITS, buf,
+                                      bytes >> BDRV_SECTOR_BITS);
 }
 
 typedef struct BdrvVmstateCo {
diff --git a/include/block/block.h b/include/block/block.h
index 11c162d..b4a97f2 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -399,8 +399,8 @@ const char *bdrv_get_node_name(const BlockDriverState *bs);
 const char *bdrv_get_device_name(const BlockDriverState *bs);
 const char *bdrv_get_device_or_node_name(const BlockDriverState *bs);
 int bdrv_get_flags(BlockDriverState *bs);
-int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
-                          const uint8_t *buf, int nb_sectors);
+int bdrv_pwrite_compressed(BlockDriverState *bs, int64_t offset,
+                           const void *buf, int bytes);
 int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi);
 ImageInfoSpecific *bdrv_get_specific_info(BlockDriverState *bs);
 void bdrv_round_sectors_to_clusters(BlockDriverState *bs,
diff --git a/include/sysemu/block-backend.h b/include/sysemu/block-backend.h
index 2da4905..07285f6 100644
--- a/include/sysemu/block-backend.h
+++ b/include/sysemu/block-backend.h
@@ -203,8 +203,8 @@ void *blk_aio_get(const AIOCBInfo *aiocb_info, BlockBackend *blk,
                   BlockCompletionFunc *cb, void *opaque);
 int coroutine_fn blk_co_pwrite_zeroes(BlockBackend *blk, int64_t offset,
                                       int count, BdrvRequestFlags flags);
-int blk_write_compressed(BlockBackend *blk, int64_t sector_num,
-                         const uint8_t *buf, int nb_sectors);
+int blk_pwrite_compressed(BlockBackend *blk, int64_t offset, const void *buf,
+                          int count);
 int blk_truncate(BlockBackend *blk, int64_t offset);
 int blk_pdiscard(BlockBackend *blk, int64_t offset, int count);
 int blk_save_vmstate(BlockBackend *blk, const uint8_t *buf,
diff --git a/qemu-img.c b/qemu-img.c
index 2e40e1f..c0f939b 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -1590,7 +1590,9 @@ static int convert_write(ImgConvertState *s, int64_t sector_num, int nb_sectors,
                     break;
                 }
 
-                ret = blk_write_compressed(s->target, sector_num, buf, n);
+                ret = blk_pwrite_compressed(s->target,
+                                            sector_num << BDRV_SECTOR_BITS,
+                                            buf, n << BDRV_SECTOR_BITS);
                 if (ret < 0) {
                     return ret;
                 }
@@ -1727,7 +1729,7 @@ static int convert_do_copy(ImgConvertState *s)
 
     if (s->compressed) {
         /* signal EOF to align */
-        ret = blk_write_compressed(s->target, 0, NULL, 0);
+        ret = blk_pwrite_compressed(s->target, 0, NULL, 0);
         if (ret < 0) {
             goto fail;
         }
diff --git a/qemu-io-cmds.c b/qemu-io-cmds.c
index 25954f5..3a3838a 100644
--- a/qemu-io-cmds.c
+++ b/qemu-io-cmds.c
@@ -504,7 +504,7 @@ static int do_write_compressed(BlockBackend *blk, char *buf, int64_t offset,
         return -ERANGE;
     }
 
-    ret = blk_write_compressed(blk, offset >> 9, (uint8_t *)buf, count >> 9);
+    ret = blk_pwrite_compressed(blk, offset, buf, count);
     if (ret < 0) {
         return ret;
     }
-- 
2.5.0