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authorAndrey Shinkevich <andrey.shinkevich@virtuozzo.com>2020-12-16 09:16:57 +0300
committerMax Reitz <mreitz@redhat.com>2021-01-26 14:36:37 +0100
commit897dd0ec4fdea4e6fa7674729750d05acc1bf41e (patch)
treef374693f0fa8f3d446c9952b41954f7c73db2ae2 /block/io.c
parentb6e0985a4c48eb4f5ed115759bc816322942f39c (diff)
block: include supported_read_flags into BDS structure
Add the new member supported_read_flags to the BlockDriverState structure. It will control the flags set for copy-on-read operations. Make the block generic layer evaluate supported read flags before they go to a block driver. Suggested-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Signed-off-by: Andrey Shinkevich <andrey.shinkevich@virtuozzo.com> Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> [vsementsov: use assert instead of abort] Reviewed-by: Max Reitz <mreitz@redhat.com> Message-Id: <20201216061703.70908-8-vsementsov@virtuozzo.com> Signed-off-by: Max Reitz <mreitz@redhat.com>
Diffstat (limited to 'block/io.c')
-rw-r--r--block/io.c10
1 files changed, 8 insertions, 2 deletions
diff --git a/block/io.c b/block/io.c
index 95b1c56c06..d203435a73 100644
--- a/block/io.c
+++ b/block/io.c
@@ -1453,6 +1453,9 @@ static int coroutine_fn bdrv_aligned_preadv(BdrvChild *child,
if (flags & BDRV_REQ_COPY_ON_READ) {
int64_t pnum;
+ /* The flag BDRV_REQ_COPY_ON_READ has reached its addressee */
+ flags &= ~BDRV_REQ_COPY_ON_READ;
+
ret = bdrv_is_allocated(bs, offset, bytes, &pnum);
if (ret < 0) {
goto out;
@@ -1474,9 +1477,11 @@ static int coroutine_fn bdrv_aligned_preadv(BdrvChild *child,
goto out;
}
+ assert(!(flags & ~bs->supported_read_flags));
+
max_bytes = ROUND_UP(MAX(0, total_bytes - offset), align);
if (bytes <= max_bytes && bytes <= max_transfer) {
- ret = bdrv_driver_preadv(bs, offset, bytes, qiov, qiov_offset, 0);
+ ret = bdrv_driver_preadv(bs, offset, bytes, qiov, qiov_offset, flags);
goto out;
}
@@ -1489,7 +1494,8 @@ static int coroutine_fn bdrv_aligned_preadv(BdrvChild *child,
ret = bdrv_driver_preadv(bs, offset + bytes - bytes_remaining,
num, qiov,
- qiov_offset + bytes - bytes_remaining, 0);
+ qiov_offset + bytes - bytes_remaining,
+ flags);
max_bytes -= num;
} else {
num = bytes_remaining;