From 3718d8ab65f68de2acccbe6a315907805f54e3cc Mon Sep 17 00:00:00 2001 From: Fam Zheng Date: Fri, 23 May 2014 21:29:43 +0800 Subject: block: Replace in_use with operation blocker This drops BlockDriverState.in_use with op_blockers: - Call bdrv_op_block_all in place of bdrv_set_in_use(bs, 1). - Call bdrv_op_unblock_all in place of bdrv_set_in_use(bs, 0). - Check bdrv_op_is_blocked() in place of bdrv_in_use(bs). The specific types are used, e.g. in place of starting block backup, bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP, ...). There is one exception in block_job_create, where bdrv_op_blocker_is_empty() is used, because we don't know the operation type here. This doesn't matter because in a few commits away we will drop the check and move it to callers that _do_ know the type. - Check bdrv_op_blocker_is_empty() in place of assert(!bs->in_use). Note: there is only bdrv_op_block_all and bdrv_op_unblock_all callers at this moment. So although the checks are specific to op types, this changes can still be seen as identical logic with previously with in_use. The difference is error message are improved because of blocker error info. Signed-off-by: Fam Zheng Reviewed-by: Jeff Cody Reviewed-by: Stefan Hajnoczi Signed-off-by: Stefan Hajnoczi --- blockdev.c | 19 +++++++++---------- 1 file changed, 9 insertions(+), 10 deletions(-) (limited to 'blockdev.c') diff --git a/blockdev.c b/blockdev.c index 1cbcc1c785..0a519029b8 100644 --- a/blockdev.c +++ b/blockdev.c @@ -1334,8 +1334,8 @@ static void external_snapshot_prepare(BlkTransactionState *common, return; } - if (bdrv_in_use(state->old_bs)) { - error_set(errp, QERR_DEVICE_IN_USE, device); + if (bdrv_op_is_blocked(state->old_bs, + BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) { return; } @@ -1557,8 +1557,7 @@ exit: static void eject_device(BlockDriverState *bs, int force, Error **errp) { - if (bdrv_in_use(bs)) { - error_set(errp, QERR_DEVICE_IN_USE, bdrv_get_device_name(bs)); + if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_EJECT, errp)) { return; } if (!bdrv_dev_has_removable_media(bs)) { @@ -1760,14 +1759,16 @@ int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data) { const char *id = qdict_get_str(qdict, "id"); BlockDriverState *bs; + Error *local_err = NULL; bs = bdrv_find(id); if (!bs) { qerror_report(QERR_DEVICE_NOT_FOUND, id); return -1; } - if (bdrv_in_use(bs)) { - qerror_report(QERR_DEVICE_IN_USE, id); + if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) { + error_report("%s", error_get_pretty(local_err)); + error_free(local_err); return -1; } @@ -2023,8 +2024,7 @@ void qmp_drive_backup(const char *device, const char *target, } } - if (bdrv_in_use(bs)) { - error_set(errp, QERR_DEVICE_IN_USE, device); + if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) { return; } @@ -2157,8 +2157,7 @@ void qmp_drive_mirror(const char *device, const char *target, } } - if (bdrv_in_use(bs)) { - error_set(errp, QERR_DEVICE_IN_USE, device); + if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR, errp)) { return; } -- cgit v1.2.1