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blockdev: honor bdrv_try_set_aio_context() context requirements

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bdrv_try_set_aio_context() requires that the old context is held, and
the new context is not held. Fix all the occurrences where it's not
done this way.

Suggested-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Sergio Lopez <slp@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Sergio Lopez 2020-01-08 15:31:34 +01:00 committed by Kevin Wolf
parent 5b7bfe515e
commit 3ea67e0883
1 changed files with 60 additions and 8 deletions
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68
blockdev.c
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@ -1535,6 +1535,7 @@ static void external_snapshot_prepare(BlkActionState *common,
DO_UPCAST(ExternalSnapshotState, common, common);
TransactionAction *action = common->action;
AioContext *aio_context;
AioContext *old_context;
int ret;
/* 'blockdev-snapshot' and 'blockdev-snapshot-sync' have similar
@ -1675,7 +1676,16 @@ static void external_snapshot_prepare(BlkActionState *common,
goto out;
}
/* Honor bdrv_try_set_aio_context() context acquisition requirements. */
old_context = bdrv_get_aio_context(state->new_bs);
aio_context_release(aio_context);
aio_context_acquire(old_context);
ret = bdrv_try_set_aio_context(state->new_bs, aio_context, errp);
aio_context_release(old_context);
aio_context_acquire(aio_context);
if (ret < 0) {
goto out;
}
@ -1775,11 +1785,13 @@ static void drive_backup_prepare(BlkActionState *common, Error **errp)
BlockDriverState *target_bs;
BlockDriverState *source = NULL;
AioContext *aio_context;
AioContext *old_context;
QDict *options;
Error *local_err = NULL;
int flags;
int64_t size;
bool set_backing_hd = false;
int ret;
assert(common->action->type == TRANSACTION_ACTION_KIND_DRIVE_BACKUP);
backup = common->action->u.drive_backup.data;
@ -1868,6 +1880,21 @@ static void drive_backup_prepare(BlkActionState *common, Error **errp)
goto out;
}
/* Honor bdrv_try_set_aio_context() context acquisition requirements. */
old_context = bdrv_get_aio_context(target_bs);
aio_context_release(aio_context);
aio_context_acquire(old_context);
ret = bdrv_try_set_aio_context(target_bs, aio_context, errp);
if (ret < 0) {
bdrv_unref(target_bs);
aio_context_release(old_context);
return;
}
aio_context_release(old_context);
aio_context_acquire(aio_context);
if (set_backing_hd) {
bdrv_set_backing_hd(target_bs, source, &local_err);
if (local_err) {
@ -1947,6 +1974,8 @@ static void blockdev_backup_prepare(BlkActionState *common, Error **errp)
BlockDriverState *bs;
BlockDriverState *target_bs;
AioContext *aio_context;
AioContext *old_context;
int ret;
assert(common->action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP);
backup = common->action->u.blockdev_backup.data;
@ -1961,7 +1990,18 @@ static void blockdev_backup_prepare(BlkActionState *common, Error **errp)
return;
}
/* Honor bdrv_try_set_aio_context() context acquisition requirements. */
aio_context = bdrv_get_aio_context(bs);
old_context = bdrv_get_aio_context(target_bs);
aio_context_acquire(old_context);
ret = bdrv_try_set_aio_context(target_bs, aio_context, errp);
if (ret < 0) {
aio_context_release(old_context);
return;
}
aio_context_release(old_context);
aio_context_acquire(aio_context);
state->bs = bs;
@ -3562,7 +3602,6 @@ static BlockJob *do_backup_common(BackupCommon *backup,
BlockJob *job = NULL;
BdrvDirtyBitmap *bmap = NULL;
int job_flags = JOB_DEFAULT;
int ret;
if (!backup->has_speed) {
backup->speed = 0;
@ -3586,11 +3625,6 @@ static BlockJob *do_backup_common(BackupCommon *backup,
backup->compress = false;
}
ret = bdrv_try_set_aio_context(target_bs, aio_context, errp);
if (ret < 0) {
return NULL;
}
if ((backup->sync == MIRROR_SYNC_MODE_BITMAP) ||
(backup->sync == MIRROR_SYNC_MODE_INCREMENTAL)) {
/* done before desugaring 'incremental' to print the right message */
@ -3825,6 +3859,7 @@ void qmp_drive_mirror(DriveMirror *arg, Error **errp)
BlockDriverState *bs;
BlockDriverState *source, *target_bs;
AioContext *aio_context;
AioContext *old_context;
BlockMirrorBackingMode backing_mode;
Error *local_err = NULL;
QDict *options = NULL;
@ -3937,12 +3972,22 @@ void qmp_drive_mirror(DriveMirror *arg, Error **errp)
(arg->mode == NEW_IMAGE_MODE_EXISTING ||
!bdrv_has_zero_init(target_bs)));
/* Honor bdrv_try_set_aio_context() context acquisition requirements. */
old_context = bdrv_get_aio_context(target_bs);
aio_context_release(aio_context);
aio_context_acquire(old_context);
ret = bdrv_try_set_aio_context(target_bs, aio_context, errp);
if (ret < 0) {
bdrv_unref(target_bs);
goto out;
aio_context_release(old_context);
return;
}
aio_context_release(old_context);
aio_context_acquire(aio_context);
blockdev_mirror_common(arg->has_job_id ? arg->job_id : NULL, bs, target_bs,
arg->has_replaces, arg->replaces, arg->sync,
backing_mode, zero_target,
@ -3984,6 +4029,7 @@ void qmp_blockdev_mirror(bool has_job_id, const char *job_id,
BlockDriverState *bs;
BlockDriverState *target_bs;
AioContext *aio_context;
AioContext *old_context;
BlockMirrorBackingMode backing_mode = MIRROR_LEAVE_BACKING_CHAIN;
Error *local_err = NULL;
bool zero_target;
@ -4001,10 +4047,16 @@ void qmp_blockdev_mirror(bool has_job_id, const char *job_id,
zero_target = (sync == MIRROR_SYNC_MODE_FULL);
/* Honor bdrv_try_set_aio_context() context acquisition requirements. */
old_context = bdrv_get_aio_context(target_bs);
aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(aio_context);
aio_context_acquire(old_context);
ret = bdrv_try_set_aio_context(target_bs, aio_context, errp);
aio_context_release(old_context);
aio_context_acquire(aio_context);
if (ret < 0) {
goto out;
}