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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

50
qemu-img.c
View file

@ -245,8 +245,7 @@ static int img_open_password(BlockBackend *blk, const char *filename,
}
static BlockBackend *img_open_opts(const char *id,
const char *optstr,
static BlockBackend *img_open_opts(const char *optstr,
QemuOpts *opts, int flags,
bool require_io, bool quiet)
{
@ -254,7 +253,7 @@ static BlockBackend *img_open_opts(const char *id,
Error *local_err = NULL;
BlockBackend *blk;
options = qemu_opts_to_qdict(opts, NULL);
blk = blk_new_open(id, NULL, NULL, options, flags, &local_err);
blk = blk_new_open(NULL, NULL, options, flags, &local_err);
if (!blk) {
error_reportf_err(local_err, "Could not open '%s'", optstr);
return NULL;
@ -267,7 +266,7 @@ static BlockBackend *img_open_opts(const char *id,
return blk;
}
static BlockBackend *img_open_file(const char *id, const char *filename,
static BlockBackend *img_open_file(const char *filename,
const char *fmt, int flags,
bool require_io, bool quiet)
{
@ -280,7 +279,7 @@ static BlockBackend *img_open_file(const char *id, const char *filename,
qdict_put(options, "driver", qstring_from_str(fmt));
}
blk = blk_new_open(id, filename, NULL, options, flags, &local_err);
blk = blk_new_open(filename, NULL, options, flags, &local_err);
if (!blk) {
error_reportf_err(local_err, "Could not open '%s': ", filename);
return NULL;
@ -294,8 +293,7 @@ static BlockBackend *img_open_file(const char *id, const char *filename,
}
static BlockBackend *img_open(const char *id,
bool image_opts,
static BlockBackend *img_open(bool image_opts,
const char *filename,
const char *fmt, int flags,
bool require_io, bool quiet)
@ -312,9 +310,9 @@ static BlockBackend *img_open(const char *id,
if (!opts) {
return NULL;
}
blk = img_open_opts(id, filename, opts, flags, true, quiet);
blk = img_open_opts(filename, opts, flags, true, quiet);
} else {
blk = img_open_file(id, filename, fmt, flags, true, quiet);
blk = img_open_file(filename, fmt, flags, true, quiet);
}
return blk;
}
@ -686,7 +684,7 @@ static int img_check(int argc, char **argv)
return 1;
}
blk = img_open("image", image_opts, filename, fmt, flags, true, quiet);
blk = img_open(image_opts, filename, fmt, flags, true, quiet);
if (!blk) {
return 1;
}
@ -878,7 +876,7 @@ static int img_commit(int argc, char **argv)
return 1;
}
blk = img_open("image", image_opts, filename, fmt, flags, true, quiet);
blk = img_open(image_opts, filename, fmt, flags, true, quiet);
if (!blk) {
return 1;
}
@ -1212,13 +1210,13 @@ static int img_compare(int argc, char **argv)
goto out3;
}
blk1 = img_open("image_1", image_opts, filename1, fmt1, flags, true, quiet);
blk1 = img_open(image_opts, filename1, fmt1, flags, true, quiet);
if (!blk1) {
ret = 2;
goto out3;
}
blk2 = img_open("image_2", image_opts, filename2, fmt2, flags, true, quiet);
blk2 = img_open(image_opts, filename2, fmt2, flags, true, quiet);
if (!blk2) {
ret = 2;
goto out2;
@ -1899,11 +1897,8 @@ static int img_convert(int argc, char **argv)
total_sectors = 0;
for (bs_i = 0; bs_i < bs_n; bs_i++) {
char *id = bs_n > 1 ? g_strdup_printf("source_%d", bs_i)
: g_strdup("source");
blk[bs_i] = img_open(id, image_opts, argv[optind + bs_i],
blk[bs_i] = img_open(image_opts, argv[optind + bs_i],
fmt, src_flags, true, quiet);
g_free(id);
if (!blk[bs_i]) {
ret = -1;
goto out;
@ -2048,8 +2043,7 @@ static int img_convert(int argc, char **argv)
* the bdrv_create() call which takes different params.
* Not critical right now, so fix can wait...
*/
out_blk = img_open_file("target", out_filename,
out_fmt, flags, true, quiet);
out_blk = img_open_file(out_filename, out_fmt, flags, true, quiet);
if (!out_blk) {
ret = -1;
goto out;
@ -2240,7 +2234,7 @@ static ImageInfoList *collect_image_info_list(bool image_opts,
}
g_hash_table_insert(filenames, (gpointer)filename, NULL);
blk = img_open("image", image_opts, filename, fmt,
blk = img_open(image_opts, filename, fmt,
BDRV_O_FLAGS | BDRV_O_NO_BACKING,
false, false);
if (!blk) {
@ -2572,8 +2566,7 @@ static int img_map(int argc, char **argv)
return 1;
}
blk = img_open("image", image_opts, filename, fmt,
BDRV_O_FLAGS, true, false);
blk = img_open(image_opts, filename, fmt, BDRV_O_FLAGS, true, false);
if (!blk) {
return 1;
}
@ -2718,8 +2711,7 @@ static int img_snapshot(int argc, char **argv)
}
/* Open the image */
blk = img_open("image", image_opts, filename, NULL,
bdrv_oflags, true, quiet);
blk = img_open(image_opts, filename, NULL, bdrv_oflags, true, quiet);
if (!blk) {
return 1;
}
@ -2890,7 +2882,7 @@ static int img_rebase(int argc, char **argv)
* Ignore the old backing file for unsafe rebase in case we want to correct
* the reference to a renamed or moved backing file.
*/
blk = img_open("image", image_opts, filename, fmt, flags, true, quiet);
blk = img_open(image_opts, filename, fmt, flags, true, quiet);
if (!blk) {
ret = -1;
goto out;
@ -2916,7 +2908,7 @@ static int img_rebase(int argc, char **argv)
}
bdrv_get_backing_filename(bs, backing_name, sizeof(backing_name));
blk_old_backing = blk_new_open("old_backing", backing_name, NULL,
blk_old_backing = blk_new_open(backing_name, NULL,
options, src_flags, &local_err);
if (!blk_old_backing) {
error_reportf_err(local_err,
@ -2933,7 +2925,7 @@ static int img_rebase(int argc, char **argv)
options = NULL;
}
blk_new_backing = blk_new_open("new_backing", out_baseimg, NULL,
blk_new_backing = blk_new_open(out_baseimg, NULL,
options, src_flags, &local_err);
if (!blk_new_backing) {
error_reportf_err(local_err,
@ -3227,7 +3219,7 @@ static int img_resize(int argc, char **argv)
n = qemu_opt_get_size(param, BLOCK_OPT_SIZE, 0);
qemu_opts_del(param);
blk = img_open("image", image_opts, filename, fmt,
blk = img_open(image_opts, filename, fmt,
BDRV_O_FLAGS | BDRV_O_RDWR, true, quiet);
if (!blk) {
ret = -1;
@ -3387,7 +3379,7 @@ static int img_amend(int argc, char **argv)
goto out;
}
blk = img_open("image", image_opts, filename, fmt, flags, true, quiet);
blk = img_open(image_opts, filename, fmt, flags, true, quiet);
if (!blk) {
ret = -1;
goto out;