[PATCH v7 40/47] block: Inline bdrv_co_block_status_from_*()

[Max Reitz <mreitz@redhat.com>]

With bdrv_filter_bs(), we can easily handle this default filter behavior
in bdrv_co_block_status().

blkdebug wants to have an additional assertion, so it keeps its own
implementation, except bdrv_co_block_status_from_file() needs to be
inlined there.

Suggested-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
---
 include/block/block_int.h | 23 ------------------
 block/backup-top.c        |  2 --
 block/blkdebug.c          |  7 ++++--
 block/blklogwrites.c      |  1 -
 block/commit.c            |  1 -
 block/copy-on-read.c      |  2 --
 block/filter-compress.c   |  2 --
 block/io.c                | 51 +++++++++++++--------------------------
 block/mirror.c            |  1 -
 block/throttle.c          |  1 -
 10 files changed, 22 insertions(+), 69 deletions(-)

diff --git a/include/block/block_int.h b/include/block/block_int.h
index 6e09e15ed4..e5a328c389 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -1291,29 +1291,6 @@ void bdrv_default_perms(BlockDriverState *bs, BdrvChild *c,
                         uint64_t perm, uint64_t shared,
                         uint64_t *nperm, uint64_t *nshared);
 
-/*
- * Default implementation for drivers to pass bdrv_co_block_status() to
- * their file.
- */
-int coroutine_fn bdrv_co_block_status_from_file(BlockDriverState *bs,
-                                                bool want_zero,
-                                                int64_t offset,
-                                                int64_t bytes,
-                                                int64_t *pnum,
-                                                int64_t *map,
-                                                BlockDriverState **file);
-/*
- * Default implementation for drivers to pass bdrv_co_block_status() to
- * their backing file.
- */
-int coroutine_fn bdrv_co_block_status_from_backing(BlockDriverState *bs,
-                                                   bool want_zero,
-                                                   int64_t offset,
-                                                   int64_t bytes,
-                                                   int64_t *pnum,
-                                                   int64_t *map,
-                                                   BlockDriverState **file);
-
 int64_t bdrv_sum_allocated_file_size(BlockDriverState *bs);
 int64_t bdrv_primary_allocated_file_size(BlockDriverState *bs);
 int64_t bdrv_notsup_allocated_file_size(BlockDriverState *bs);
diff --git a/block/backup-top.c b/block/backup-top.c
index 89bd3937d0..bf5fc22fc7 100644
--- a/block/backup-top.c
+++ b/block/backup-top.c
@@ -185,8 +185,6 @@ BlockDriver bdrv_backup_top_filter = {
     .bdrv_co_pwritev_compressed = backup_top_co_pwritev_compressed,
     .bdrv_co_flush              = backup_top_co_flush,
 
-    .bdrv_co_block_status       = bdrv_co_block_status_from_backing,
-
     .bdrv_refresh_filename      = backup_top_refresh_filename,
 
     .bdrv_child_perm            = backup_top_child_perm,
diff --git a/block/blkdebug.c b/block/blkdebug.c
index 7194bc7f06..cf78d8809e 100644
--- a/block/blkdebug.c
+++ b/block/blkdebug.c
@@ -757,8 +757,11 @@ static int coroutine_fn blkdebug_co_block_status(BlockDriverState *bs,
         return err;
     }
 
-    return bdrv_co_block_status_from_file(bs, want_zero, offset, bytes,
-                                          pnum, map, file);
+    assert(bs->file && bs->file->bs);
+    *pnum = bytes;
+    *map = offset;
+    *file = bs->file->bs;
+    return BDRV_BLOCK_RAW | BDRV_BLOCK_OFFSET_VALID;
 }
 
 static void blkdebug_close(BlockDriverState *bs)
diff --git a/block/blklogwrites.c b/block/blklogwrites.c
index 6753bd9a3e..c6b2711fe5 100644
--- a/block/blklogwrites.c
+++ b/block/blklogwrites.c
@@ -517,7 +517,6 @@ static BlockDriver bdrv_blk_log_writes = {
     .bdrv_co_pwrite_zeroes  = blk_log_writes_co_pwrite_zeroes,
     .bdrv_co_flush_to_disk  = blk_log_writes_co_flush_to_disk,
     .bdrv_co_pdiscard       = blk_log_writes_co_pdiscard,
-    .bdrv_co_block_status   = bdrv_co_block_status_from_file,
 
     .is_filter              = true,
     .strong_runtime_opts    = blk_log_writes_strong_runtime_opts,
diff --git a/block/commit.c b/block/commit.c
index 4122b6736d..ea9282daea 100644
--- a/block/commit.c
+++ b/block/commit.c
@@ -238,7 +238,6 @@ static void bdrv_commit_top_child_perm(BlockDriverState *bs, BdrvChild *c,
 static BlockDriver bdrv_commit_top = {
     .format_name                = "commit_top",
     .bdrv_co_preadv             = bdrv_commit_top_preadv,
-    .bdrv_co_block_status       = bdrv_co_block_status_from_backing,
     .bdrv_refresh_filename      = bdrv_commit_top_refresh_filename,
     .bdrv_child_perm            = bdrv_commit_top_child_perm,
 
diff --git a/block/copy-on-read.c b/block/copy-on-read.c
index a6a864f147..2816e61afe 100644
--- a/block/copy-on-read.c
+++ b/block/copy-on-read.c
@@ -146,8 +146,6 @@ static BlockDriver bdrv_copy_on_read = {
     .bdrv_eject                         = cor_eject,
     .bdrv_lock_medium                   = cor_lock_medium,
 
-    .bdrv_co_block_status               = bdrv_co_block_status_from_file,
-
     .has_variable_length                = true,
     .is_filter                          = true,
 };
diff --git a/block/filter-compress.c b/block/filter-compress.c
index 8ec1991c1f..5136371bf8 100644
--- a/block/filter-compress.c
+++ b/block/filter-compress.c
@@ -146,8 +146,6 @@ static BlockDriver bdrv_compress = {
     .bdrv_eject                         = compress_eject,
     .bdrv_lock_medium                   = compress_lock_medium,
 
-    .bdrv_co_block_status               = bdrv_co_block_status_from_file,
-
     .has_variable_length                = true,
     .is_filter                          = true,
 };
diff --git a/block/io.c b/block/io.c
index 9e802804bb..e2196d438c 100644
--- a/block/io.c
+++ b/block/io.c
@@ -2253,36 +2253,6 @@ typedef struct BdrvCoBlockStatusData {
     BlockDriverState **file;
 } BdrvCoBlockStatusData;
 
-int coroutine_fn bdrv_co_block_status_from_file(BlockDriverState *bs,
-                                                bool want_zero,
-                                                int64_t offset,
-                                                int64_t bytes,
-                                                int64_t *pnum,
-                                                int64_t *map,
-                                                BlockDriverState **file)
-{
-    assert(bs->file && bs->file->bs);
-    *pnum = bytes;
-    *map = offset;
-    *file = bs->file->bs;
-    return BDRV_BLOCK_RAW | BDRV_BLOCK_OFFSET_VALID;
-}
-
-int coroutine_fn bdrv_co_block_status_from_backing(BlockDriverState *bs,
-                                                   bool want_zero,
-                                                   int64_t offset,
-                                                   int64_t bytes,
-                                                   int64_t *pnum,
-                                                   int64_t *map,
-                                                   BlockDriverState **file)
-{
-    assert(bs->backing && bs->backing->bs);
-    *pnum = bytes;
-    *map = offset;
-    *file = bs->backing->bs;
-    return BDRV_BLOCK_RAW | BDRV_BLOCK_OFFSET_VALID;
-}
-
 /*
  * Returns the allocation status of the specified sectors.
  * Drivers not implementing the functionality are assumed to not support
@@ -2323,6 +2293,7 @@ static int coroutine_fn bdrv_co_block_status(BlockDriverState *bs,
     BlockDriverState *local_file = NULL;
     int64_t aligned_offset, aligned_bytes;
     uint32_t align;
+    bool has_filtered_child;
 
     assert(pnum);
     *pnum = 0;
@@ -2348,7 +2319,8 @@ static int coroutine_fn bdrv_co_block_status(BlockDriverState *bs,
 
     /* Must be non-NULL or bdrv_getlength() would have failed */
     assert(bs->drv);
-    if (!bs->drv->bdrv_co_block_status) {
+    has_filtered_child = bdrv_filter_child(bs);
+    if (!bs->drv->bdrv_co_block_status && !has_filtered_child) {
         *pnum = bytes;
         ret = BDRV_BLOCK_DATA | BDRV_BLOCK_ALLOCATED;
         if (offset + bytes == total_size) {
@@ -2369,9 +2341,20 @@ static int coroutine_fn bdrv_co_block_status(BlockDriverState *bs,
     aligned_offset = QEMU_ALIGN_DOWN(offset, align);
     aligned_bytes = ROUND_UP(offset + bytes, align) - aligned_offset;
 
-    ret = bs->drv->bdrv_co_block_status(bs, want_zero, aligned_offset,
-                                        aligned_bytes, pnum, &local_map,
-                                        &local_file);
+    if (bs->drv->bdrv_co_block_status) {
+        ret = bs->drv->bdrv_co_block_status(bs, want_zero, aligned_offset,
+                                            aligned_bytes, pnum, &local_map,
+                                            &local_file);
+    } else {
+        /* Default code for filters */
+
+        local_file = bdrv_filter_bs(bs);
+        assert(local_file);
+
+        *pnum = aligned_bytes;
+        local_map = aligned_offset;
+        ret = BDRV_BLOCK_RAW | BDRV_BLOCK_OFFSET_VALID;
+    }
     if (ret < 0) {
         *pnum = 0;
         goto out;
diff --git a/block/mirror.c b/block/mirror.c
index 770de3b34e..5a9e42e488 100644
--- a/block/mirror.c
+++ b/block/mirror.c
@@ -1541,7 +1541,6 @@ static BlockDriver bdrv_mirror_top = {
     .bdrv_co_pdiscard           = bdrv_mirror_top_pdiscard,
     .bdrv_co_pwritev_compressed = bdrv_mirror_top_pwritev_compressed,
     .bdrv_co_flush              = bdrv_mirror_top_flush,
-    .bdrv_co_block_status       = bdrv_co_block_status_from_backing,
     .bdrv_refresh_filename      = bdrv_mirror_top_refresh_filename,
     .bdrv_child_perm            = bdrv_mirror_top_child_perm,
 
diff --git a/block/throttle.c b/block/throttle.c
index f6e619aca2..473ea758df 100644
--- a/block/throttle.c
+++ b/block/throttle.c
@@ -263,7 +263,6 @@ static BlockDriver bdrv_throttle = {
     .bdrv_reopen_prepare                =   throttle_reopen_prepare,
     .bdrv_reopen_commit                 =   throttle_reopen_commit,
     .bdrv_reopen_abort                  =   throttle_reopen_abort,
-    .bdrv_co_block_status               =   bdrv_co_block_status_from_file,
 
     .bdrv_co_drain_begin                =   throttle_co_drain_begin,
     .bdrv_co_drain_end                  =   throttle_co_drain_end,
-- 
2.26.2