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block: Attach bs->file only during .bdrv_open() 

The way that attaching bs->file worked was a bit unusual in that it was
the only child that would be attached to a node which is not opened yet.
Because of this, the block layer couldn't know yet which permissions the
driver would eventually need.

This patch moves the point where bs->file is attached to the beginning
of the individual .bdrv_open() implementations, so drivers already know
what they are going to do with the child. This is also more consistent
with how driver-specific children work.

For a moment, bdrv_open() gets its own BdrvChild to perform image
probing, but instead of directly assigning this BdrvChild to the BDS, it
becomes a temporary one and the node name is passed as an option to the
drivers, so that they can simply use bdrv_open_child() to create another
reference for their own use.

This duplicated child for (the not opened yet) bs is not the final
state, a follow-up patch will change the image probing code to use a
BlockBackend, which is completely independent of bs.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Kevin Wolf 2016-12-16 18:52:37 +01:00
parent 52cdbc5869
commit 4e4bf5c42c
17 changed files with 130 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

33
block.c
View File

@ -1103,13 +1103,6 @@ static int bdrv_open_common(BlockDriverState *bs, BdrvChild *file,
assert(!drv->bdrv_needs_filename || filename != NULL);
ret = drv->bdrv_file_open(bs, options, open_flags, &local_err);
} else {
if (file == NULL) {
error_setg(errp, "Can't use '%s' as a block driver for the "
"protocol level", drv->format_name);
ret = -EINVAL;
goto free_and_fail;
}
bs->file = file;
ret = drv->bdrv_open(bs, options, open_flags, &local_err);
}
@ -1145,7 +1138,6 @@ static int bdrv_open_common(BlockDriverState *bs, BdrvChild *file,
return 0;
free_and_fail:
bs->file = NULL;
g_free(bs->opaque);
bs->opaque = NULL;
bs->drv = NULL;
@ -1368,8 +1360,19 @@ void bdrv_unref_child(BlockDriverState *parent, BdrvChild *child)
}
if (child->bs->inherits_from == parent) {
BdrvChild *c;
/* Remove inherits_from only when the last reference between parent and
* child->bs goes away. */
QLIST_FOREACH(c, &parent->children, next) {
if (c != child && c->bs == child->bs) {
break;
}
}
if (c == NULL) {
child->bs->inherits_from = NULL;
}
}
bdrv_root_unref_child(child);
}
@ -1789,13 +1792,20 @@ static BlockDriverState *bdrv_open_inherit(const char *filename,
qdict_del(options, "backing");
}
/* Open image file without format layer */
/* Open image file without format layer. This BdrvChild is only used for
* probing, the block drivers will do their own bdrv_open_child() for the
* same BDS, which is why we put the node name back into options. */
if ((flags & BDRV_O_PROTOCOL) == 0) {
/* FIXME Shouldn't attach a child to a node that isn't opened yet. */
file = bdrv_open_child(filename, options, "file", bs,
&child_file, true, &local_err);
if (local_err) {
goto fail;
}
if (file != NULL) {
qdict_put(options, "file",
qstring_from_str(bdrv_get_node_name(file->bs)));
}
}
/* Image format probing */
@ -1835,7 +1845,7 @@ static BlockDriverState *bdrv_open_inherit(const char *filename,
goto fail;
}
if (file && (bs->file != file)) {
if (file) {
bdrv_unref_child(bs, file);
file = NULL;
}
@ -1901,6 +1911,9 @@ fail:
if (file != NULL) {
bdrv_unref_child(bs, file);
}
if (bs->file != NULL) {
bdrv_unref_child(bs, bs->file);
}
QDECREF(snapshot_options);
QDECREF(bs->explicit_options);
QDECREF(bs->options);

6
block/bochs.c
View File

@ -104,6 +104,12 @@ static int bochs_open(BlockDriverState *bs, QDict *options, int flags,
struct bochs_header bochs;
int ret;
bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file,
false, errp);
if (!bs->file) {
return -EINVAL;
}
bs->read_only = true; /* no write support yet */
ret = bdrv_pread(bs->file, 0, &bochs, sizeof(bochs));

6
block/cloop.c
View File

@ -66,6 +66,12 @@ static int cloop_open(BlockDriverState *bs, QDict *options, int flags,
uint32_t offsets_size, max_compressed_block_size = 1, i;
int ret;
bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file,
false, errp);
if (!bs->file) {
return -EINVAL;
}
bs->read_only = true;
/* read header */

6
block/crypto.c
View File

@ -300,6 +300,12 @@ static int block_crypto_open_generic(QCryptoBlockFormat format,
QCryptoBlockOpenOptions *open_opts = NULL;
unsigned int cflags = 0;
bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file,
false, errp);
if (!bs->file) {
return -EINVAL;
}
opts = qemu_opts_create(opts_spec, NULL, 0, &error_abort);
qemu_opts_absorb_qdict(opts, options, &local_err);
if (local_err) {

6
block/dmg.c
View File

@ -413,6 +413,12 @@ static int dmg_open(BlockDriverState *bs, QDict *options, int flags,
int64_t offset;
int ret;
bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file,
false, errp);
if (!bs->file) {
return -EINVAL;
}
block_module_load_one("dmg-bz2");
bs->read_only = true;

6
block/parallels.c
View File

@ -581,6 +581,12 @@ static int parallels_open(BlockDriverState *bs, QDict *options, int flags,
Error *local_err = NULL;
char *buf;
bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file,
false, errp);
if (!bs->file) {
return -EINVAL;
}
ret = bdrv_pread(bs->file, 0, &ph, sizeof(ph));
if (ret < 0) {
goto fail;

6
block/qcow.c
View File

@ -106,6 +106,12 @@ static int qcow_open(BlockDriverState *bs, QDict *options, int flags,
QCowHeader header;
Error *local_err = NULL;
bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file,
false, errp);
if (!bs->file) {
return -EINVAL;
}
ret = bdrv_pread(bs->file, 0, &header, sizeof(header));
if (ret < 0) {
goto fail;

16
block/qcow2.c
View File

@ -814,7 +814,7 @@ static int qcow2_update_options(BlockDriverState *bs, QDict *options,
return ret;
}
static int qcow2_open(BlockDriverState *bs, QDict *options, int flags,
static int qcow2_do_open(BlockDriverState *bs, QDict *options, int flags,
Error **errp)
{
BDRVQcow2State *s = bs->opaque;
@ -1205,6 +1205,18 @@ static int qcow2_open(BlockDriverState *bs, QDict *options, int flags,
return ret;
}
static int qcow2_open(BlockDriverState *bs, QDict *options, int flags,
Error **errp)
{
bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file,
false, errp);
if (!bs->file) {
return -EINVAL;
}
return qcow2_do_open(bs, options, flags, errp);
}
static void qcow2_refresh_limits(BlockDriverState *bs, Error **errp)
{
BDRVQcow2State *s = bs->opaque;
@ -1785,7 +1797,7 @@ static void qcow2_invalidate_cache(BlockDriverState *bs, Error **errp)
options = qdict_clone_shallow(bs->options);
flags &= ~BDRV_O_INACTIVE;
ret = qcow2_open(bs, options, flags, &local_err);
ret = qcow2_do_open(bs, options, flags, &local_err);
QDECREF(options);
if (local_err) {
error_propagate(errp, local_err);

16
block/qed.c
View File

@ -415,7 +415,7 @@ static void bdrv_qed_drain(BlockDriverState *bs)
}
}
static int bdrv_qed_open(BlockDriverState *bs, QDict *options, int flags,
static int bdrv_qed_do_open(BlockDriverState *bs, QDict *options, int flags,
Error **errp)
{
BDRVQEDState *s = bs->opaque;
@ -550,6 +550,18 @@ out:
return ret;
}
static int bdrv_qed_open(BlockDriverState *bs, QDict *options, int flags,
Error **errp)
{
bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file,
false, errp);
if (!bs->file) {
return -EINVAL;
}
return bdrv_qed_do_open(bs, options, flags, errp);
}
static void bdrv_qed_refresh_limits(BlockDriverState *bs, Error **errp)
{
BDRVQEDState *s = bs->opaque;
@ -1629,7 +1641,7 @@ static void bdrv_qed_invalidate_cache(BlockDriverState *bs, Error **errp)
bdrv_qed_close(bs);
memset(s, 0, sizeof(BDRVQEDState));
ret = bdrv_qed_open(bs, NULL, bs->open_flags, &local_err);
ret = bdrv_qed_do_open(bs, NULL, bs->open_flags, &local_err);
if (local_err) {
error_propagate(errp, local_err);
error_prepend(errp, "Could not reopen qed layer: ");

6
block/raw-format.c
View File

@ -384,6 +384,12 @@ static int raw_open(BlockDriverState *bs, QDict *options, int flags,
BDRVRawState *s = bs->opaque;
int ret;
bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file,
false, errp);
if (!bs->file) {
return -EINVAL;
}
bs->sg = bs->file->bs->sg;
bs->supported_write_flags = BDRV_REQ_FUA &
bs->file->bs->supported_write_flags;

6
block/replication.c
View File

@ -86,6 +86,12 @@ static int replication_open(BlockDriverState *bs, QDict *options,
const char *mode;
const char *top_id;
bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file,
false, errp);
if (!bs->file) {
return -EINVAL;
}
ret = -EINVAL;
opts = qemu_opts_create(&replication_runtime_opts, NULL, 0, &error_abort);
qemu_opts_absorb_qdict(opts, options, &local_err);

6
block/vdi.c
View File

@ -363,6 +363,12 @@ static int vdi_open(BlockDriverState *bs, QDict *options, int flags,
int ret;
Error *local_err = NULL;
bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file,
false, errp);
if (!bs->file) {
return -EINVAL;
}
logout("\n");
ret = bdrv_read(bs->file, 0, (uint8_t *)&header, 1);

6
block/vhdx.c
View File

@ -898,6 +898,12 @@ static int vhdx_open(BlockDriverState *bs, QDict *options, int flags,
uint64_t signature;
Error *local_err = NULL;
bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file,
false, errp);
if (!bs->file) {
return -EINVAL;
}
s->bat = NULL;
s->first_visible_write = true;

6
block/vmdk.c
View File

@ -943,6 +943,12 @@ static int vmdk_open(BlockDriverState *bs, QDict *options, int flags,
uint32_t magic;
Error *local_err = NULL;
bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file,
false, errp);
if (!bs->file) {
return -EINVAL;
}
buf = vmdk_read_desc(bs->file, 0, errp);
if (!buf) {
return -EINVAL;

6
block/vpc.c
View File

@ -220,6 +220,12 @@ static int vpc_open(BlockDriverState *bs, QDict *options, int flags,
int disk_type = VHD_DYNAMIC;
int ret;
bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file,
false, errp);
if (!bs->file) {
return -EINVAL;
}
opts = qemu_opts_create(&vpc_runtime_opts, NULL, 0, &error_abort);
qemu_opts_absorb_qdict(opts, options, &local_err);
if (local_err) {

4
tests/qemu-iotests/051.out
View File

@ -225,7 +225,7 @@ Testing: -drive driver=nbd
QEMU_PROG: -drive driver=nbd: NBD server address missing
Testing: -drive driver=raw
QEMU_PROG: -drive driver=raw: Can't use 'raw' as a block driver for the protocol level
QEMU_PROG: -drive driver=raw: A block device must be specified for "file"
Testing: -drive file.driver=file
QEMU_PROG: -drive file.driver=file: The 'file' block driver requires a file name
@ -234,7 +234,7 @@ Testing: -drive file.driver=nbd
QEMU_PROG: -drive file.driver=nbd: NBD server address missing
Testing: -drive file.driver=raw
QEMU_PROG: -drive file.driver=raw: Can't use 'raw' as a block driver for the protocol level
QEMU_PROG: -drive file.driver=raw: A block device must be specified for "file"
Testing: -drive foo=bar
QEMU_PROG: -drive foo=bar: Must specify either driver or file

4
tests/qemu-iotests/051.pc.out
View File

@ -323,7 +323,7 @@ Testing: -drive driver=nbd
QEMU_PROG: -drive driver=nbd: NBD server address missing
Testing: -drive driver=raw
QEMU_PROG: -drive driver=raw: Can't use 'raw' as a block driver for the protocol level
QEMU_PROG: -drive driver=raw: A block device must be specified for "file"
Testing: -drive file.driver=file
QEMU_PROG: -drive file.driver=file: The 'file' block driver requires a file name
@ -332,7 +332,7 @@ Testing: -drive file.driver=nbd
QEMU_PROG: -drive file.driver=nbd: NBD server address missing
Testing: -drive file.driver=raw
QEMU_PROG: -drive file.driver=raw: Can't use 'raw' as a block driver for the protocol level
QEMU_PROG: -drive file.driver=raw: A block device must be specified for "file"
Testing: -drive foo=bar
QEMU_PROG: -drive foo=bar: Must specify either driver or file