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blockdev: Split monitor reference from BB creation

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Before this patch, blk_new() automatically assigned a name to the new
BlockBackend and considered it referenced by the monitor. This patch
removes the implicit monitor_add_blk() call from blk_new() (and
consequently the monitor_remove_blk() call from blk_delete(), too) and
thus blk_new() (and related functions) no longer take a BB name
argument.

In fact, there is only a single point where blk_new()/blk_new_open() is
called and the new BB is monitor-owned, and that is in blockdev_init().
Besides thus relieving us from having to invent names for all of the BBs
we use in qemu-img, this fixes a bug where qemu cannot create a new
image if there already is a monitor-owned BB named "image".

If a BB and its BDS tree are created in a single operation, as of this
patch the BDS tree will be created before the BB is given a name
(whereas it was the other way around before). This results in minor
change to the output of iotest 087, whose reference output is amended
accordingly.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Max Reitz 2016-03-16 19:54:38 +01:00 • committed by Kevin Wolf
parent e5e785500b
commit efaa7c4eeb
18 changed files with 68 additions and 76 deletions
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17
blockdev.c
View file

@ -147,6 +147,7 @@ void blockdev_auto_del(BlockBackend *blk)
DriveInfo *dinfo = blk_legacy_dinfo(blk);
if (dinfo && dinfo->auto_del) {
monitor_remove_blk(blk);
blk_unref(blk);
}
}
@ -561,7 +562,7 @@ static BlockBackend *blockdev_init(const char *file, QDict *bs_opts,
if ((!file || !*file) && !qdict_size(bs_opts)) {
BlockBackendRootState *blk_rs;
blk = blk_new(qemu_opts_id(opts), errp);
blk = blk_new(errp);
if (!blk) {
goto early_err;
}
@ -597,8 +598,7 @@ static BlockBackend *blockdev_init(const char *file, QDict *bs_opts,
bdrv_flags |= BDRV_O_INACTIVE;
}
blk = blk_new_open(qemu_opts_id(opts), file, NULL, bs_opts, bdrv_flags,
errp);
blk = blk_new_open(file, NULL, bs_opts, bdrv_flags, errp);
if (!blk) {
goto err_no_bs_opts;
}
@ -630,6 +630,12 @@ static BlockBackend *blockdev_init(const char *file, QDict *bs_opts,
blk_set_on_error(blk, on_read_error, on_write_error);
if (!monitor_add_blk(blk, qemu_opts_id(opts), errp)) {
blk_unref(blk);
blk = NULL;
goto err_no_bs_opts;
}
err_no_bs_opts:
qemu_opts_del(opts);
QDECREF(interval_dict);
@ -2859,6 +2865,8 @@ void hmp_drive_del(Monitor *mon, const QDict *qdict)
blk_remove_bs(blk);
}
monitor_remove_blk(blk);
/* if we have a device attached to this BlockDriverState
* then we need to make the drive anonymous until the device
* can be removed. If this is a drive with no device backing
@ -3976,6 +3984,7 @@ void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
if (bs && bdrv_key_required(bs)) {
if (blk) {
monitor_remove_blk(blk);
blk_unref(blk);
} else {
QTAILQ_REMOVE(&monitor_bdrv_states, bs, monitor_list);
@ -4005,6 +4014,7 @@ void qmp_x_blockdev_del(bool has_id, const char *id,
}
if (has_id) {
/* blk_by_name() never returns a BB that is not owned by the monitor */
blk = blk_by_name(id);
if (!blk) {
error_setg(errp, "Cannot find block backend %s", id);
@ -4052,6 +4062,7 @@ void qmp_x_blockdev_del(bool has_id, const char *id,
}
if (blk) {
monitor_remove_blk(blk);
blk_unref(blk);
} else {
QTAILQ_REMOVE(&monitor_bdrv_states, bs, monitor_list);