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block: Mark bdrv_co_is_inserted() and callers GRAPH_RDLOCK

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

blk_is_inserted() is done as a co_wrapper_mixed_bdrv_rdlock (unlike most
other blk_* functions) because it is called a lot from other blk_co_*()
functions that already hold the lock. These calls go through
blk_is_available(), which becomes a co_wrapper_mixed_bdrv_rdlock, too,
for the same reason.

Functions that run in a coroutine and can call bdrv_co_is_available()
directly are changed to do so, which results in better TSA coverage.

Signed-off-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20230203152202.49054-19-kwolf@redhat.com>
Reviewed-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Emanuele Giuseppe Esposito 2023-02-03 16:21:57 +01:00 committed by Kevin Wolf
parent c382706925
commit c73ff92c9d
5 changed files with 23 additions and 17 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

1
block.c
View file

@ -6826,6 +6826,7 @@ bool coroutine_fn bdrv_co_is_inserted(BlockDriverState *bs)
BlockDriver *drv = bs->drv;
BdrvChild *child;
IO_CODE();
assert_bdrv_graph_readable();
if (!drv) {
return false;

25
block/block-backend.c
View file

@ -1235,8 +1235,8 @@ void blk_set_disable_request_queuing(BlockBackend *blk, bool disable)
blk->disable_request_queuing = disable;
}
static coroutine_fn int blk_check_byte_request(BlockBackend *blk,
int64_t offset, int64_t bytes)
static int coroutine_fn GRAPH_RDLOCK
blk_check_byte_request(BlockBackend *blk, int64_t offset, int64_t bytes)
{
int64_t len;
@ -1244,7 +1244,7 @@ static coroutine_fn int blk_check_byte_request(BlockBackend *blk,
return -EIO;
}
if (!blk_is_available(blk)) {
if (!blk_co_is_available(blk)) {
return -ENOMEDIUM;
}
@ -1606,8 +1606,9 @@ BlockAIOCB *blk_aio_pwrite_zeroes(BlockBackend *blk, int64_t offset,
int64_t coroutine_fn blk_co_getlength(BlockBackend *blk)
{
IO_CODE();
GRAPH_RDLOCK_GUARD();
if (!blk_is_available(blk)) {
if (!blk_co_is_available(blk)) {
return -ENOMEDIUM;
}
@ -1627,8 +1628,9 @@ void blk_get_geometry(BlockBackend *blk, uint64_t *nb_sectors_ptr)
int64_t coroutine_fn blk_co_nb_sectors(BlockBackend *blk)
{
IO_CODE();
GRAPH_RDLOCK_GUARD();
if (!blk_is_available(blk)) {
if (!blk_co_is_available(blk)) {
return -ENOMEDIUM;
}
@ -1676,7 +1678,7 @@ blk_co_do_ioctl(BlockBackend *blk, unsigned long int req, void *buf)
blk_wait_while_drained(blk);
GRAPH_RDLOCK_GUARD();
if (!blk_is_available(blk)) {
if (!blk_co_is_available(blk)) {
return -ENOMEDIUM;
}
@ -1769,7 +1771,7 @@ static int coroutine_fn blk_co_do_flush(BlockBackend *blk)
blk_wait_while_drained(blk);
GRAPH_RDLOCK_GUARD();
if (!blk_is_available(blk)) {
if (!blk_co_is_available(blk)) {
return -ENOMEDIUM;
}
@ -1996,14 +1998,15 @@ bool coroutine_fn blk_co_is_inserted(BlockBackend *blk)
{
BlockDriverState *bs = blk_bs(blk);
IO_CODE();
assert_bdrv_graph_readable();
return bs && bdrv_co_is_inserted(bs);
}
bool blk_is_available(BlockBackend *blk)
bool coroutine_fn blk_co_is_available(BlockBackend *blk)
{
IO_CODE();
return blk_is_inserted(blk) && !blk_dev_is_tray_open(blk);
return blk_co_is_inserted(blk) && !blk_dev_is_tray_open(blk);
}
void coroutine_fn blk_co_lock_medium(BlockBackend *blk, bool locked)
@ -2382,7 +2385,7 @@ int coroutine_fn blk_co_truncate(BlockBackend *blk, int64_t offset, bool exact,
{
IO_OR_GS_CODE();
GRAPH_RDLOCK_GUARD();
if (!blk_is_available(blk)) {
if (!blk_co_is_available(blk)) {
error_setg(errp, "No medium inserted");
return -ENOMEDIUM;
}
@ -2637,6 +2640,7 @@ int coroutine_fn blk_co_copy_range(BlockBackend *blk_in, int64_t off_in,
{
int r;
IO_CODE();
GRAPH_RDLOCK_GUARD();
r = blk_check_byte_request(blk_in, off_in, bytes);
if (r) {
@ -2647,7 +2651,6 @@ int coroutine_fn blk_co_copy_range(BlockBackend *blk_in, int64_t off_in,
return r;
}
GRAPH_RDLOCK_GUARD();
return bdrv_co_copy_range(blk_in->root, off_in,
blk_out->root, off_out,
bytes, read_flags, write_flags);

4
include/block/block-io.h
View file

@ -145,8 +145,8 @@ bool bdrv_is_writable(BlockDriverState *bs);
bool bdrv_is_sg(BlockDriverState *bs);
int bdrv_get_flags(BlockDriverState *bs);
bool coroutine_fn bdrv_co_is_inserted(BlockDriverState *bs);
bool co_wrapper bdrv_is_inserted(BlockDriverState *bs);
bool coroutine_fn GRAPH_RDLOCK bdrv_co_is_inserted(BlockDriverState *bs);
bool co_wrapper_bdrv_rdlock bdrv_is_inserted(BlockDriverState *bs);
void coroutine_fn bdrv_co_lock_medium(BlockDriverState *bs, bool locked);
void coroutine_fn bdrv_co_eject(BlockDriverState *bs, bool eject_flag);

3
include/block/block_int-common.h
View file

@ -712,7 +712,8 @@ struct BlockDriver {
BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos);
/* removable device specific */
bool coroutine_fn (*bdrv_co_is_inserted)(BlockDriverState *bs);
bool coroutine_fn GRAPH_RDLOCK_PTR (*bdrv_co_is_inserted)(
BlockDriverState *bs);
void coroutine_fn (*bdrv_co_eject)(BlockDriverState *bs, bool eject_flag);
void coroutine_fn (*bdrv_co_lock_medium)(BlockDriverState *bs, bool locked);

7
include/sysemu/block-backend-io.h
View file

@ -55,10 +55,11 @@ BlockAIOCB *blk_aio_ioctl(BlockBackend *blk, unsigned long int req, void *buf,
void blk_inc_in_flight(BlockBackend *blk);
void blk_dec_in_flight(BlockBackend *blk);
bool coroutine_fn blk_co_is_inserted(BlockBackend *blk);
bool co_wrapper_mixed blk_is_inserted(BlockBackend *blk);
bool coroutine_fn GRAPH_RDLOCK blk_co_is_inserted(BlockBackend *blk);
bool co_wrapper_mixed_bdrv_rdlock blk_is_inserted(BlockBackend *blk);
bool blk_is_available(BlockBackend *blk);
bool coroutine_fn GRAPH_RDLOCK blk_co_is_available(BlockBackend *blk);
bool co_wrapper_mixed_bdrv_rdlock blk_is_available(BlockBackend *blk);
void coroutine_fn blk_co_lock_medium(BlockBackend *blk, bool locked);
void co_wrapper blk_lock_medium(BlockBackend *blk, bool locked);