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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
Download patch file Download diff file Expand all files Collapse all files

6
block/vmdk.c
View file

@ -1661,7 +1661,7 @@ static int vmdk_create_extent(const char *filename, int64_t filesize,
goto exit;
}
blk = blk_new_open("extent", filename, NULL, NULL,
blk = blk_new_open(filename, NULL, NULL,
BDRV_O_RDWR | BDRV_O_CACHE_WB | BDRV_O_PROTOCOL,
&local_err);
if (blk == NULL) {
@ -1946,7 +1946,7 @@ static int vmdk_create(const char *filename, QemuOpts *opts, Error **errp)
goto exit;
}
blk = blk_new_open("backing", full_backing, NULL, NULL,
blk = blk_new_open(full_backing, NULL, NULL,
BDRV_O_NO_BACKING | BDRV_O_CACHE_WB, errp);
g_free(full_backing);
if (blk == NULL) {
@ -2018,7 +2018,7 @@ static int vmdk_create(const char *filename, QemuOpts *opts, Error **errp)
}
}
new_blk = blk_new_open("descriptor", filename, NULL, NULL,
new_blk = blk_new_open(filename, NULL, NULL,
BDRV_O_RDWR | BDRV_O_CACHE_WB | BDRV_O_PROTOCOL,
&local_err);
if (new_blk == NULL) {