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

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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>
This commit is contained in:
Max Reitz 2014-02-18 18:33:05 +01:00 committed by Kevin Wolf
parent e6dc8a1f83
commit f67503e5bd
12 changed files with 73 additions and 57 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

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],