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block: Change BDS parameter of bdrv_open() to ** 

Make bdrv_open() take a pointer to a BDS pointer, similarly to
bdrv_file_open(). If a pointer to a NULL pointer is given, bdrv_open()
will create a new BDS with an empty name; if the BDS pointer is not
NULL, that existing BDS will be reused (in the same way as bdrv_open()
already did).

Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
pull/6/merge
Max Reitz 12 years ago
committed by Kevin Wolf
parent
e6dc8a1f83
commit
f67503e5bd
12 changed files with 73 additions and 57 deletions
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  1. 64
      block.c
  2. 1
      block/blkdebug.c
  3. 2
      block/blkverify.c
  4. 14
      block/qcow2.c
  5. 5
      block/vmdk.c
  6. 6
      block/vvfat.c
  7. 20
      blockdev.c
  8. 2
      hw/block/xen_disk.c
  9. 2
      include/block/block.h
  10. 10
      qemu-img.c
  11. 2
      qemu-io.c
  12. 2
      qemu-nbd.c

64
block.c
View File

@ -1046,7 +1046,7 @@ int bdrv_file_open(BlockDriverState **pbs, const char *filename,
}
if (!drv->bdrv_file_open) {
ret = bdrv_open(bs, filename, options, flags, drv, &local_err);
ret = bdrv_open(&bs, filename, options, flags, drv, &local_err);
options = NULL;
} else {
ret = bdrv_open_common(bs, NULL, options, flags, drv, &local_err);
@ -1115,8 +1115,6 @@ int bdrv_open_backing_file(BlockDriverState *bs, QDict *options, Error **errp)
sizeof(backing_filename));
}
bs->backing_hd = bdrv_new("");
if (bs->backing_format[0] != '\0') {
back_drv = bdrv_find_format(bs->backing_format);
}
@ -1125,11 +1123,11 @@ int bdrv_open_backing_file(BlockDriverState *bs, QDict *options, Error **errp)
back_flags = bs->open_flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT |
BDRV_O_COPY_ON_READ);
ret = bdrv_open(bs->backing_hd,
assert(bs->backing_hd == NULL);
ret = bdrv_open(&bs->backing_hd,
*backing_filename ? backing_filename : NULL, options,
back_flags, back_drv, &local_err);
if (ret < 0) {
bdrv_unref(bs->backing_hd);
bs->backing_hd = NULL;
bs->open_flags |= BDRV_O_NO_BACKING;
error_setg(errp, "Could not open backing file: %s",
@ -1166,6 +1164,8 @@ int bdrv_open_backing_file(BlockDriverState *bs, QDict *options, Error **errp)
* BlockdevRef.
*
* The BlockdevRef will be removed from the options QDict.
*
* To conform with the behavior of bdrv_open(), *pbs has to be NULL.
*/
int bdrv_open_image(BlockDriverState **pbs, const char *filename,
QDict *options, const char *bdref_key, int flags,
@ -1176,6 +1176,9 @@ int bdrv_open_image(BlockDriverState **pbs, const char *filename,
char *bdref_key_dot;
const char *reference;
assert(pbs);
assert(*pbs == NULL);
bdref_key_dot = g_strdup_printf("%s.", bdref_key);
qdict_extract_subqdict(options, &image_options, bdref_key_dot);
g_free(bdref_key_dot);
@ -1196,8 +1199,6 @@ int bdrv_open_image(BlockDriverState **pbs, const char *filename,
/* If a filename is given and the block driver should be detected
automatically (instead of using none), use bdrv_open() in order to do
that auto-detection. */
BlockDriverState *bs;
if (reference) {
error_setg(errp, "Cannot reference an existing block device while "
"giving a filename");
@ -1205,13 +1206,7 @@ int bdrv_open_image(BlockDriverState **pbs, const char *filename,
goto done;
}
bs = bdrv_new("");
ret = bdrv_open(bs, filename, image_options, flags, NULL, errp);
if (ret < 0) {
bdrv_unref(bs);
} else {
*pbs = bs;
}
ret = bdrv_open(pbs, filename, image_options, flags, NULL, errp);
} else {
ret = bdrv_file_open(pbs, filename, reference, image_options, flags,
errp);
@ -1229,17 +1224,28 @@ done:
* empty set of options. The reference to the QDict belongs to the block layer
* after the call (even on failure), so if the caller intends to reuse the
* dictionary, it needs to use QINCREF() before calling bdrv_open.
*
* If *pbs is NULL, a new BDS will be created with a pointer to it stored there.
* If it is not NULL, the referenced BDS will be reused.
*/
int bdrv_open(BlockDriverState *bs, const char *filename, QDict *options,
int bdrv_open(BlockDriverState **pbs, const char *filename, QDict *options,
int flags, BlockDriver *drv, Error **errp)
{
int ret;
/* TODO: extra byte is a hack to ensure MAX_PATH space on Windows. */
char tmp_filename[PATH_MAX + 1];
BlockDriverState *file = NULL;
BlockDriverState *file = NULL, *bs;
const char *drvname;
Error *local_err = NULL;
assert(pbs);
if (*pbs) {
bs = *pbs;
} else {
bs = bdrv_new("");
}
/* NULL means an empty set of options */
if (options == NULL) {
options = qdict_new();
@ -1260,12 +1266,11 @@ int bdrv_open(BlockDriverState *bs, const char *filename, QDict *options,
instead of opening 'filename' directly */
/* Get the required size from the image */
bs1 = bdrv_new("");
QINCREF(options);
ret = bdrv_open(bs1, filename, options, BDRV_O_NO_BACKING,
bs1 = NULL;
ret = bdrv_open(&bs1, filename, options, BDRV_O_NO_BACKING,
drv, &local_err);
if (ret < 0) {
bdrv_unref(bs1);
goto fail;
}
total_size = bdrv_getlength(bs1) & BDRV_SECTOR_MASK;
@ -1322,6 +1327,7 @@ int bdrv_open(BlockDriverState *bs, const char *filename, QDict *options,
flags |= BDRV_O_ALLOW_RDWR;
}
assert(file == NULL);
ret = bdrv_open_image(&file, filename, options, "file",
bdrv_open_flags(bs, flags | BDRV_O_UNMAP), true, true,
&local_err);
@ -1393,6 +1399,7 @@ int bdrv_open(BlockDriverState *bs, const char *filename, QDict *options,
bdrv_dev_change_media_cb(bs, true);
}
*pbs = bs;
return 0;
unlink_and_fail:
@ -1406,13 +1413,24 @@ fail:
QDECREF(bs->options);
QDECREF(options);
bs->options = NULL;
if (!*pbs) {
/* If *pbs is NULL, a new BDS has been created in this function and
needs to be freed now. Otherwise, it does not need to be closed,
since it has not really been opened yet. */
bdrv_unref(bs);
}
if (local_err) {
error_propagate(errp, local_err);
}
return ret;
close_and_fail:
bdrv_close(bs);
/* See fail path, but now the BDS has to be always closed */
if (*pbs) {
bdrv_close(bs);
} else {
bdrv_unref(bs);
}
QDECREF(options);
if (local_err) {
error_propagate(errp, local_err);
@ -5290,9 +5308,8 @@ void bdrv_img_create(const char *filename, const char *fmt,
back_flags =
flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING);
bs = bdrv_new("");
ret = bdrv_open(bs, backing_file->value.s, NULL, back_flags,
bs = NULL;
ret = bdrv_open(&bs, backing_file->value.s, NULL, back_flags,
backing_drv, &local_err);
if (ret < 0) {
error_setg_errno(errp, -ret, "Could not open '%s': %s",
@ -5300,7 +5317,6 @@ void bdrv_img_create(const char *filename, const char *fmt,
error_get_pretty(local_err));
error_free(local_err);
local_err = NULL;
bdrv_unref(bs);
goto out;
}
bdrv_get_geometry(bs, &size);

1
block/blkdebug.c
View File

@ -410,6 +410,7 @@ static int blkdebug_open(BlockDriverState *bs, QDict *options, int flags,
s->state = 1;
/* Open the backing file */
assert(bs->file == NULL);
ret = bdrv_open_image(&bs->file, qemu_opt_get(opts, "x-image"), options, "image",
flags, true, false, &local_err);
if (ret < 0) {

2
block/blkverify.c
View File

@ -135,6 +135,7 @@ static int blkverify_open(BlockDriverState *bs, QDict *options, int flags,
}
/* Open the raw file */
assert(bs->file == NULL);
ret = bdrv_open_image(&bs->file, qemu_opt_get(opts, "x-raw"), options,
"raw", flags, true, false, &local_err);
if (ret < 0) {
@ -143,6 +144,7 @@ static int blkverify_open(BlockDriverState *bs, QDict *options, int flags,
}
/* Open the test file */
assert(s->test_file == NULL);
ret = bdrv_open_image(&s->test_file, qemu_opt_get(opts, "x-image"), options,
"test", flags, false, false, &local_err);
if (ret < 0) {

14
block/qcow2.c
View File

@ -1543,7 +1543,8 @@ static int qcow2_create2(const char *filename, int64_t total_size,
goto out;
}
bdrv_close(bs);
bdrv_unref(bs);
bs = NULL;
/*
* And now open the image and make it consistent first (i.e. increase the
@ -1552,7 +1553,7 @@ static int qcow2_create2(const char *filename, int64_t total_size,
*/
BlockDriver* drv = bdrv_find_format("qcow2");
assert(drv != NULL);
ret = bdrv_open(bs, filename, NULL,
ret = bdrv_open(&bs, filename, NULL,
BDRV_O_RDWR | BDRV_O_CACHE_WB | BDRV_O_NO_FLUSH, drv, &local_err);
if (ret < 0) {
error_propagate(errp, local_err);
@ -1599,10 +1600,11 @@ static int qcow2_create2(const char *filename, int64_t total_size,
}
}
bdrv_close(bs);
bdrv_unref(bs);
bs = NULL;
/* Reopen the image without BDRV_O_NO_FLUSH to flush it before returning */
ret = bdrv_open(bs, filename, NULL,
ret = bdrv_open(&bs, filename, NULL,
BDRV_O_RDWR | BDRV_O_CACHE_WB | BDRV_O_NO_BACKING,
drv, &local_err);
if (local_err) {
@ -1612,7 +1614,9 @@ static int qcow2_create2(const char *filename, int64_t total_size,
ret = 0;
out:
bdrv_unref(bs);
if (bs) {
bdrv_unref(bs);
}
return ret;
}

5
block/vmdk.c
View File

@ -1755,10 +1755,9 @@ static int vmdk_create(const char *filename, QEMUOptionParameter *options,
goto exit;
}
if (backing_file) {
BlockDriverState *bs = bdrv_new("");
ret = bdrv_open(bs, backing_file, NULL, BDRV_O_NO_BACKING, NULL, errp);
BlockDriverState *bs = NULL;
ret = bdrv_open(&bs, backing_file, NULL, BDRV_O_NO_BACKING, NULL, errp);
if (ret != 0) {
bdrv_unref(bs);
goto exit;
}
if (strcmp(bs->drv->format_name, "vmdk")) {

6
block/vvfat.c
View File

@ -2936,15 +2936,13 @@ static int enable_write_target(BDRVVVFATState *s)
goto err;
}
s->qcow = bdrv_new("");
ret = bdrv_open(s->qcow, s->qcow_filename, NULL,
s->qcow = NULL;
ret = bdrv_open(&s->qcow, s->qcow_filename, NULL,
BDRV_O_RDWR | BDRV_O_CACHE_WB | BDRV_O_NO_FLUSH, bdrv_qcow,
&local_err);
if (ret < 0) {
qerror_report_err(local_err);
error_free(local_err);
bdrv_unref(s->qcow);
goto err;
}

20
blockdev.c
View File

@ -504,7 +504,7 @@ static DriveInfo *blockdev_init(const char *file, QDict *bs_opts,
bdrv_flags |= ro ? 0 : BDRV_O_RDWR;
QINCREF(bs_opts);
ret = bdrv_open(dinfo->bdrv, file, bs_opts, bdrv_flags, drv, &error);
ret = bdrv_open(&dinfo->bdrv, file, bs_opts, bdrv_flags, drv, &error);
if (ret < 0) {
error_setg(errp, "could not open disk image %s: %s",
@ -1330,12 +1330,12 @@ static void external_snapshot_prepare(BlkTransactionState *common,
qstring_from_str(snapshot_node_name));
}
/* We will manually add the backing_hd field to the bs later */
state->new_bs = bdrv_new("");
/* TODO Inherit bs->options or only take explicit options with an
* extended QMP command? */
ret = bdrv_open(state->new_bs, new_image_file, options,
assert(state->new_bs == NULL);
ret = bdrv_open(&state->new_bs, new_image_file, options,
flags | BDRV_O_NO_BACKING, drv, &local_err);
/* We will manually add the backing_hd field to the bs later */
if (ret != 0) {
error_propagate(errp, local_err);
}
@ -1582,7 +1582,7 @@ static void qmp_bdrv_open_encrypted(BlockDriverState *bs, const char *filename,
Error *local_err = NULL;
int ret;
ret = bdrv_open(bs, filename, NULL, bdrv_flags, drv, &local_err);
ret = bdrv_open(&bs, filename, NULL, bdrv_flags, drv, &local_err);
if (ret < 0) {
error_propagate(errp, local_err);
return;
@ -2018,10 +2018,9 @@ void qmp_drive_backup(const char *device, const char *target,
return;
}
target_bs = bdrv_new("");
ret = bdrv_open(target_bs, target, NULL, flags, drv, &local_err);
target_bs = NULL;
ret = bdrv_open(&target_bs, target, NULL, flags, drv, &local_err);
if (ret < 0) {
bdrv_unref(target_bs);
error_propagate(errp, local_err);
return;
}
@ -2162,11 +2161,10 @@ void qmp_drive_mirror(const char *device, const char *target,
/* Mirroring takes care of copy-on-write using the source's backing
* file.
*/
target_bs = bdrv_new("");
ret = bdrv_open(target_bs, target, NULL, flags | BDRV_O_NO_BACKING, drv,
target_bs = NULL;
ret = bdrv_open(&target_bs, target, NULL, flags | BDRV_O_NO_BACKING, drv,
&local_err);
if (ret < 0) {
bdrv_unref(target_bs);
error_propagate(errp, local_err);
return;
}

2
hw/block/xen_disk.c
View File

@ -813,7 +813,7 @@ static int blk_connect(struct XenDevice *xendev)
Error *local_err = NULL;
BlockDriver *drv = bdrv_find_whitelisted_format(blkdev->fileproto,
readonly);
if (bdrv_open(blkdev->bs,
if (bdrv_open(&blkdev->bs,
blkdev->filename, NULL, qflags, drv, &local_err) != 0)
{
xen_be_printf(&blkdev->xendev, 0, "error: %s\n",

2
include/block/block.h
View File

@ -190,7 +190,7 @@ int bdrv_open_image(BlockDriverState **pbs, const char *filename,
QDict *options, const char *bdref_key, int flags,
bool force_raw, bool allow_none, Error **errp);
int bdrv_open_backing_file(BlockDriverState *bs, QDict *options, Error **errp);
int bdrv_open(BlockDriverState *bs, const char *filename, QDict *options,
int bdrv_open(BlockDriverState **pbs, const char *filename, QDict *options,
int flags, BlockDriver *drv, Error **errp);
BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue,
BlockDriverState *bs, int flags);

10
qemu-img.c
View File

@ -289,7 +289,7 @@ static BlockDriverState *bdrv_new_open(const char *filename,
drv = NULL;
}
ret = bdrv_open(bs, filename, NULL, flags, drv, &local_err);
ret = bdrv_open(&bs, filename, NULL, flags, drv, &local_err);
if (ret < 0) {
error_report("Could not open '%s': %s", filename,
error_get_pretty(local_err));
@ -310,9 +310,7 @@ static BlockDriverState *bdrv_new_open(const char *filename,
}
return bs;
fail:
if (bs) {
bdrv_unref(bs);
}
bdrv_unref(bs);
return NULL;
}
@ -2314,7 +2312,7 @@ static int img_rebase(int argc, char **argv)
bs_old_backing = bdrv_new("old_backing");
bdrv_get_backing_filename(bs, backing_name, sizeof(backing_name));
ret = bdrv_open(bs_old_backing, backing_name, NULL, BDRV_O_FLAGS,
ret = bdrv_open(&bs_old_backing, backing_name, NULL, BDRV_O_FLAGS,
old_backing_drv, &local_err);
if (ret) {
error_report("Could not open old backing file '%s': %s",
@ -2324,7 +2322,7 @@ static int img_rebase(int argc, char **argv)
}
if (out_baseimg[0]) {
bs_new_backing = bdrv_new("new_backing");
ret = bdrv_open(bs_new_backing, out_baseimg, NULL, BDRV_O_FLAGS,
ret = bdrv_open(&bs_new_backing, out_baseimg, NULL, BDRV_O_FLAGS,
new_backing_drv, &local_err);
if (ret) {
error_report("Could not open new backing file '%s': %s",

2
qemu-io.c
View File

@ -68,7 +68,7 @@ static int openfile(char *name, int flags, int growable, QDict *opts)
} else {
qemuio_bs = bdrv_new("hda");
if (bdrv_open(qemuio_bs, name, opts, flags, NULL, &local_err) < 0) {
if (bdrv_open(&qemuio_bs, name, opts, flags, NULL, &local_err) < 0) {
fprintf(stderr, "%s: can't open device %s: %s\n", progname, name,
error_get_pretty(local_err));
error_free(local_err);

2
qemu-nbd.c
View File

@ -597,7 +597,7 @@ int main(int argc, char **argv)
bs = bdrv_new("hda");
srcpath = argv[optind];
ret = bdrv_open(bs, srcpath, NULL, flags, drv, &local_err);
ret = bdrv_open(&bs, srcpath, NULL, flags, drv, &local_err);
if (ret < 0) {
errno = -ret;
err(EXIT_FAILURE, "Failed to bdrv_open '%s': %s", argv[optind],

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