block: Mark bdrv_co_refresh_total_sectors() and callers GRAPH_RDLOCK

This adds GRAPH_RDLOCK annotations to declare that callers of
bdrv_co_refresh_total_sectors() need to hold a reader lock for the
graph.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20230203152202.49054-24-kwolf@redhat.com>
Reviewed-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

block.c

@@ -1042,6 +1042,7 @@ int coroutine_fn bdrv_co_refresh_total_sectors(BlockDriverState *bs,
 {
     BlockDriver *drv = bs->drv;
     IO_CODE();
+    assert_bdrv_graph_readable();
 
     if (!drv) {
         return -ENOMEDIUM;
@@ -5843,6 +5844,7 @@ int64_t coroutine_fn bdrv_co_nb_sectors(BlockDriverState *bs)
 {
     BlockDriver *drv = bs->drv;
     IO_CODE();
+    assert_bdrv_graph_readable();
 
     if (!drv)
         return -ENOMEDIUM;
@@ -5864,6 +5866,7 @@ int64_t coroutine_fn bdrv_co_getlength(BlockDriverState *bs)
 {
     int64_t ret;
     IO_CODE();
+    assert_bdrv_graph_readable();
 
     ret = bdrv_co_nb_sectors(bs);
     if (ret < 0) {

block/blkdebug.c

@@ -967,7 +967,8 @@ static bool blkdebug_debug_is_suspended(BlockDriverState *bs, const char *tag)
     return false;
 }
 
-static int64_t coroutine_fn blkdebug_co_getlength(BlockDriverState *bs)
+static int64_t coroutine_fn GRAPH_RDLOCK
+blkdebug_co_getlength(BlockDriverState *bs)
 {
     return bdrv_co_getlength(bs->file->bs);
 }

block/blklogwrites.c

@@ -267,7 +267,8 @@ static void blk_log_writes_close(BlockDriverState *bs)
     s->log_file = NULL;
 }
 
-static int64_t coroutine_fn blk_log_writes_co_getlength(BlockDriverState *bs)
+static int64_t coroutine_fn GRAPH_RDLOCK
+blk_log_writes_co_getlength(BlockDriverState *bs)
 {
     return bdrv_co_getlength(bs->file->bs);
 }

block/blkreplay.c

@@ -40,7 +40,8 @@ fail:
     return ret;
 }
 
-static int64_t coroutine_fn blkreplay_co_getlength(BlockDriverState *bs)
+static int64_t coroutine_fn GRAPH_RDLOCK
+blkreplay_co_getlength(BlockDriverState *bs)
 {
     return bdrv_co_getlength(bs->file->bs);
 }

block/blkverify.c

@@ -155,7 +155,8 @@ static void blkverify_close(BlockDriverState *bs)
     s->test_file = NULL;
 }
 
-static int64_t coroutine_fn blkverify_co_getlength(BlockDriverState *bs)
+static int64_t coroutine_fn GRAPH_RDLOCK
+blkverify_co_getlength(BlockDriverState *bs)
 {
     BDRVBlkverifyState *s = bs->opaque;
 

block/copy-on-read.c

@@ -121,7 +121,7 @@ static void cor_child_perm(BlockDriverState *bs, BdrvChild *c,
 }
 
 
-static int64_t coroutine_fn cor_co_getlength(BlockDriverState *bs)
+static int64_t coroutine_fn GRAPH_RDLOCK cor_co_getlength(BlockDriverState *bs)
 {
     return bdrv_co_getlength(bs->file->bs);
 }

block/crypto.c

@@ -530,7 +530,8 @@ static void block_crypto_refresh_limits(BlockDriverState *bs, Error **errp)
 }
 
 
-static int64_t coroutine_fn block_crypto_co_getlength(BlockDriverState *bs)
+static int64_t coroutine_fn GRAPH_RDLOCK
+block_crypto_co_getlength(BlockDriverState *bs)
 {
     BlockCrypto *crypto = bs->opaque;
     int64_t len = bdrv_co_getlength(bs->file->bs);

block/filter-compress.c

@@ -55,7 +55,8 @@ static int compress_open(BlockDriverState *bs, QDict *options, int flags,
 }
 
 
-static int64_t coroutine_fn compress_co_getlength(BlockDriverState *bs)
+static int64_t coroutine_fn GRAPH_RDLOCK
+compress_co_getlength(BlockDriverState *bs)
 {
     return bdrv_co_getlength(bs->file->bs);
 }

block/mirror.c

@@ -917,7 +917,10 @@ static int coroutine_fn mirror_run(Job *job, Error **errp)
         goto immediate_exit;
     }
 
+    bdrv_graph_co_rdlock();
     s->bdev_length = bdrv_co_getlength(bs);
+    bdrv_graph_co_rdunlock();
+
     if (s->bdev_length < 0) {
         ret = s->bdev_length;
         goto immediate_exit;

block/preallocate.c

@@ -443,7 +443,8 @@ static int coroutine_fn GRAPH_RDLOCK preallocate_co_flush(BlockDriverState *bs)
     return bdrv_co_flush(bs->file->bs);
 }
 
-static int64_t coroutine_fn preallocate_co_getlength(BlockDriverState *bs)
+static int64_t coroutine_fn GRAPH_RDLOCK
+preallocate_co_getlength(BlockDriverState *bs)
 {
     int64_t ret;
     BDRVPreallocateState *s = bs->opaque;

block/quorum.c

@@ -764,7 +764,8 @@ quorum_co_pwrite_zeroes(BlockDriverState *bs, int64_t offset, int64_t bytes,
                              flags | BDRV_REQ_ZERO_WRITE);
 }
 
-static int64_t coroutine_fn quorum_co_getlength(BlockDriverState *bs)
+static int64_t coroutine_fn GRAPH_RDLOCK
+quorum_co_getlength(BlockDriverState *bs)
 {
     BDRVQuorumState *s = bs->opaque;
     int64_t result;

block/raw-format.c

@@ -317,7 +317,8 @@ raw_co_pdiscard(BlockDriverState *bs, int64_t offset, int64_t bytes)
     return bdrv_co_pdiscard(bs->file, offset, bytes);
 }
 
-static int64_t coroutine_fn raw_co_getlength(BlockDriverState *bs)
+static int64_t coroutine_fn GRAPH_RDLOCK
+raw_co_getlength(BlockDriverState *bs)
 {
     int64_t len;
     BDRVRawState *s = bs->opaque;

block/replication.c

@@ -179,7 +179,8 @@ static void replication_child_perm(BlockDriverState *bs, BdrvChild *c,
     return;
 }
 
-static int64_t coroutine_fn replication_co_getlength(BlockDriverState *bs)
+static int64_t coroutine_fn GRAPH_RDLOCK
+replication_co_getlength(BlockDriverState *bs)
 {
     return bdrv_co_getlength(bs->file->bs);
 }

block/stream.c

@@ -141,9 +141,11 @@ static int coroutine_fn stream_run(Job *job, Error **errp)
         return 0;
     }
 
-    len = bdrv_getlength(s->target_bs);
+    WITH_GRAPH_RDLOCK_GUARD() {
-    if (len < 0) {
+        len = bdrv_co_getlength(s->target_bs);
-        return len;
+        if (len < 0) {
+            return len;
+        }
     }
     job_progress_set_remaining(&s->common.job, len);
 

block/throttle.c

@@ -106,7 +106,8 @@ static void throttle_close(BlockDriverState *bs)
 }
 
 
-static int64_t coroutine_fn throttle_co_getlength(BlockDriverState *bs)
+static int64_t coroutine_fn GRAPH_RDLOCK
+throttle_co_getlength(BlockDriverState *bs)
 {
     return bdrv_co_getlength(bs->file->bs);
 }

include/block/block-io.h

@@ -78,11 +78,11 @@ int coroutine_fn GRAPH_RDLOCK
 bdrv_co_truncate(BdrvChild *child, int64_t offset, bool exact,
                  PreallocMode prealloc, BdrvRequestFlags flags, Error **errp);
 
-int64_t coroutine_fn bdrv_co_nb_sectors(BlockDriverState *bs);
+int64_t coroutine_fn GRAPH_RDLOCK bdrv_co_nb_sectors(BlockDriverState *bs);
-int64_t co_wrapper_mixed bdrv_nb_sectors(BlockDriverState *bs);
+int64_t co_wrapper_mixed_bdrv_rdlock bdrv_nb_sectors(BlockDriverState *bs);
 
-int64_t coroutine_fn bdrv_co_getlength(BlockDriverState *bs);
+int64_t coroutine_fn GRAPH_RDLOCK bdrv_co_getlength(BlockDriverState *bs);
-int64_t co_wrapper_mixed bdrv_getlength(BlockDriverState *bs);
+int64_t co_wrapper_mixed_bdrv_rdlock bdrv_getlength(BlockDriverState *bs);
 
 int64_t coroutine_fn bdrv_co_get_allocated_file_size(BlockDriverState *bs);
 int64_t co_wrapper bdrv_get_allocated_file_size(BlockDriverState *bs);

include/block/block_int-common.h

@@ -684,7 +684,9 @@ struct BlockDriver {
         BlockDriverState *bs, int64_t offset, bool exact,
         PreallocMode prealloc, BdrvRequestFlags flags, Error **errp);
 
-    int64_t coroutine_fn (*bdrv_co_getlength)(BlockDriverState *bs);
+    int64_t coroutine_fn GRAPH_RDLOCK_PTR (*bdrv_co_getlength)(
+        BlockDriverState *bs);
+
     int64_t coroutine_fn (*bdrv_co_get_allocated_file_size)(
         BlockDriverState *bs);
 

include/block/block_int-io.h

@@ -124,9 +124,10 @@ bdrv_co_copy_range_to(BdrvChild *src, int64_t src_offset,
                       int64_t bytes, BdrvRequestFlags read_flags,
                       BdrvRequestFlags write_flags);
 
-int coroutine_fn bdrv_co_refresh_total_sectors(BlockDriverState *bs,
+int coroutine_fn GRAPH_RDLOCK
-                                               int64_t hint);
+bdrv_co_refresh_total_sectors(BlockDriverState *bs, int64_t hint);
-int co_wrapper_mixed
+
+int co_wrapper_mixed_bdrv_rdlock
 bdrv_refresh_total_sectors(BlockDriverState *bs, int64_t hint);
 
 BdrvChild *bdrv_cow_child(BlockDriverState *bs);