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block: drop BlockDriverState::read_only

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This variable is just a cache for !(bs->open_flags & BDRV_O_RDWR),
which we have to synchronize everywhere. Let's just drop it and
consistently use bdrv_is_read_only().

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <20210527154056.70294-3-vsementsov@virtuozzo.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Vladimir Sementsov-Ogievskiy 2021-05-27 18:40:55 +03:00 committed by Kevin Wolf
parent 307261b243
commit 975da07374
3 changed files with 1 additions and 13 deletions
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7
block.c
View File

@ -265,7 +265,7 @@ void bdrv_parse_filename_strip_prefix(const char *filename, const char *prefix,
* image is inactivated. */
bool bdrv_is_read_only(BlockDriverState *bs)
{
return bs->read_only;
return !(bs->open_flags & BDRV_O_RDWR);
}
int bdrv_can_set_read_only(BlockDriverState *bs, bool read_only,
@ -317,7 +317,6 @@ int bdrv_apply_auto_read_only(BlockDriverState *bs, const char *errmsg,
goto fail;
}
bs->read_only = true;
bs->open_flags &= ~BDRV_O_RDWR;
return 0;
@ -1549,7 +1548,6 @@ static int bdrv_open_driver(BlockDriverState *bs, BlockDriver *drv,
}
bs->drv = drv;
bs->read_only = !(bs->open_flags & BDRV_O_RDWR);
bs->opaque = g_malloc0(drv->instance_size);
if (drv->bdrv_file_open) {
@ -1771,8 +1769,6 @@ static int bdrv_open_common(BlockDriverState *bs, BlockBackend *file,
trace_bdrv_open_common(bs, filename ?: "", bs->open_flags,
drv->format_name);
bs->read_only = !(bs->open_flags & BDRV_O_RDWR);
ro = bdrv_is_read_only(bs);
if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv, ro)) {
@ -4548,7 +4544,6 @@ static void bdrv_reopen_commit(BDRVReopenState *reopen_state)
bs->explicit_options = reopen_state->explicit_options;
bs->options = reopen_state->options;
bs->open_flags = reopen_state->flags;
bs->read_only = !(reopen_state->flags & BDRV_O_RDWR);
bs->detect_zeroes = reopen_state->detect_zeroes;
if (reopen_state->replace_backing_bs) {

1
include/block/block_int.h
View File

@ -843,7 +843,6 @@ struct BlockDriverState {
* locking needed during I/O...
*/
int open_flags; /* flags used to open the file, re-used for re-open */
bool read_only; /* if true, the media is read only */
bool encrypted; /* if true, the media is encrypted */
bool sg; /* if true, the device is a /dev/sg* */
bool probed; /* if true, format was probed rather than specified */

6
tests/unit/test-block-iothread.c
View File

@ -194,13 +194,11 @@ static void test_sync_op_truncate(BdrvChild *c)
g_assert_cmpint(ret, ==, -EINVAL);
/* Error: Read-only image */
c->bs->read_only = true;
c->bs->open_flags &= ~BDRV_O_RDWR;
ret = bdrv_truncate(c, 65536, false, PREALLOC_MODE_OFF, 0, NULL);
g_assert_cmpint(ret, ==, -EACCES);
c->bs->read_only = false;
c->bs->open_flags |= BDRV_O_RDWR;
}
@ -236,13 +234,11 @@ static void test_sync_op_flush(BdrvChild *c)
g_assert_cmpint(ret, ==, 0);
/* Early success: Read-only image */
c->bs->read_only = true;
c->bs->open_flags &= ~BDRV_O_RDWR;
ret = bdrv_flush(c->bs);
g_assert_cmpint(ret, ==, 0);
c->bs->read_only = false;
c->bs->open_flags |= BDRV_O_RDWR;
}
@ -256,13 +252,11 @@ static void test_sync_op_blk_flush(BlockBackend *blk)
g_assert_cmpint(ret, ==, 0);
/* Early success: Read-only image */
bs->read_only = true;
bs->open_flags &= ~BDRV_O_RDWR;
ret = blk_flush(blk);
g_assert_cmpint(ret, ==, 0);
bs->read_only = false;
bs->open_flags |= BDRV_O_RDWR;
}