block: remove BlockDriver.bdrv_write_compressed

There are no block drivers left that implement the old
.bdrv_write_compressed interface, so it can be removed. Also now we have
no need to use the bdrv_pwrite_compressed function and we can remove it
entirely.
Signed-off-by: NPavel Butsykin <pbutsykin@virtuozzo.com>
Reviewed-by: NStefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: NDenis 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>
Signed-off-by: NKevin Wolf <kwolf@redhat.com>

block/block-backend.c

@@ -1488,12 +1488,8 @@ int coroutine_fn blk_co_pwrite_zeroes(BlockBackend *blk, int64_t offset,
 int blk_pwrite_compressed(BlockBackend *blk, int64_t offset, const void *buf,
                           int count)
 {
-    int ret = blk_check_byte_request(blk, offset, count);
-    if (ret < 0) {
-        return ret;
-    }
-
-    return bdrv_pwrite_compressed(blk->root, offset, buf, count);
+    return blk_prw(blk, offset, (void *) buf, count, blk_write_entry,
+                   BDRV_REQ_WRITE_COMPRESSED);
 }
 
 int blk_truncate(BlockBackend *blk, int64_t offset)

block/io.c

@@ -1887,37 +1887,6 @@ int bdrv_is_allocated_above(BlockDriverState *top,
     return 0;
 }
 
-int bdrv_pwrite_compressed(BdrvChild *child, int64_t offset,
-                           const void *buf, int bytes)
-{
-    BlockDriverState *bs = child->bs;
-    BlockDriver *drv = bs->drv;
-    QEMUIOVector qiov;
-    struct iovec iov;
-
-    if (!drv) {
-        return -ENOMEDIUM;
-    }
-    if (drv->bdrv_write_compressed) {
-        int 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, offset >> BDRV_SECTOR_BITS, buf,
-                                          bytes >> BDRV_SECTOR_BITS);
-    }
-    iov = (struct iovec) {
-        .iov_base = (void *)buf,
-        .iov_len = bytes,
-    };
-    qemu_iovec_init_external(&qiov, &iov, 1);
-
-    return bdrv_prwv_co(child, offset, &qiov, true, BDRV_REQ_WRITE_COMPRESSED);
-}
-
 typedef struct BdrvVmstateCo {
     BlockDriverState    *bs;
     QEMUIOVector        *qiov;

include/block/block.h

@@ -400,8 +400,6 @@ 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_pwrite_compressed(BdrvChild *child, 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,

include/block/block_int.h

@@ -204,9 +204,6 @@ struct BlockDriver {
     bool has_variable_length;
     int64_t (*bdrv_get_allocated_file_size)(BlockDriverState *bs);
 
-    int (*bdrv_write_compressed)(BlockDriverState *bs, int64_t sector_num,
-                                 const uint8_t *buf, int nb_sectors);
-
     int coroutine_fn (*bdrv_co_pwritev_compressed)(BlockDriverState *bs,
         uint64_t offset, uint64_t bytes, QEMUIOVector *qiov);
 

qemu-img.c

@@ -2034,7 +2034,7 @@ static int img_convert(int argc, char **argv)
         const char *preallocation =
             qemu_opt_get(opts, BLOCK_OPT_PREALLOC);
 
-        if (!drv->bdrv_write_compressed && !drv->bdrv_co_pwritev_compressed) {
+        if (!drv->bdrv_co_pwritev_compressed) {
             error_report("Compression not supported for this file format");
             ret = -1;
             goto out;