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block: Allow reference for bdrv_file_open() 

Allow specifying a reference to an existing block device (by name) for
bdrv_file_open() instead of a filename and/or options.

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 2013-12-20 19:28:08 +01:00 committed by Kevin Wolf
parent 89f2b21e36
commit 72daa72eee
12 changed files with 41 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
block.c
View File

@ -858,9 +858,10 @@ free_and_fail:
* dictionary, it needs to use QINCREF() before calling bdrv_file_open.
*/
int bdrv_file_open(BlockDriverState **pbs, const char *filename,
QDict *options, int flags, Error **errp)
const char *reference, QDict *options, int flags,
Error **errp)
{
BlockDriverState *bs;
BlockDriverState *bs = NULL;
BlockDriver *drv;
const char *drvname;
bool allow_protocol_prefix = false;
@ -872,6 +873,24 @@ int bdrv_file_open(BlockDriverState **pbs, const char *filename,
options = qdict_new();
}
if (reference) {
if (filename || qdict_size(options)) {
error_setg(errp, "Cannot reference an existing block device with "
"additional options or a new filename");
return -EINVAL;
}
QDECREF(options);
bs = bdrv_find(reference);
if (!bs) {
error_setg(errp, "Cannot find block device '%s'", reference);
return -ENODEV;
}
bdrv_ref(bs);
*pbs = bs;
return 0;
}
bs = bdrv_new("");
bs->options = options;
options = qdict_clone_shallow(options);
@ -1124,7 +1143,7 @@ int bdrv_open(BlockDriverState *bs, const char *filename, QDict *options,
qdict_extract_subqdict(options, &file_options, "file.");
ret = bdrv_file_open(&file, filename, file_options,
ret = bdrv_file_open(&file, filename, NULL, file_options,
bdrv_open_flags(bs, flags | BDRV_O_UNMAP), &local_err);
if (ret < 0) {
goto fail;

2
block/blkdebug.c
View File

@ -403,7 +403,7 @@ static int blkdebug_open(BlockDriverState *bs, QDict *options, int flags,
goto fail;
}
ret = bdrv_file_open(&bs->file, filename, NULL, flags, &local_err);
ret = bdrv_file_open(&bs->file, filename, NULL, NULL, flags, &local_err);
if (ret < 0) {
error_propagate(errp, local_err);
goto fail;

2
block/blkverify.c
View File

@ -141,7 +141,7 @@ static int blkverify_open(BlockDriverState *bs, QDict *options, int flags,
goto fail;
}
ret = bdrv_file_open(&bs->file, raw, NULL, flags, &local_err);
ret = bdrv_file_open(&bs->file, raw, NULL, NULL, flags, &local_err);
if (ret < 0) {
error_propagate(errp, local_err);
goto fail;

3
block/cow.c
View File

@ -351,7 +351,8 @@ static int cow_create(const char *filename, QEMUOptionParameter *options,
return ret;
}
ret = bdrv_file_open(&cow_bs, filename, NULL, BDRV_O_RDWR, &local_err);
ret = bdrv_file_open(&cow_bs, filename, NULL, NULL, BDRV_O_RDWR,
&local_err);
if (ret < 0) {
qerror_report_err(local_err);
error_free(local_err);

3
block/qcow.c
View File

@ -691,7 +691,8 @@ static int qcow_create(const char *filename, QEMUOptionParameter *options,
return ret;
}
ret = bdrv_file_open(&qcow_bs, filename, NULL, BDRV_O_RDWR, &local_err);
ret = bdrv_file_open(&qcow_bs, filename, NULL, NULL, BDRV_O_RDWR,
&local_err);
if (ret < 0) {
qerror_report_err(local_err);
error_free(local_err);

2
block/qcow2.c
View File

@ -1483,7 +1483,7 @@ static int qcow2_create2(const char *filename, int64_t total_size,
return ret;
}
ret = bdrv_file_open(&bs, filename, NULL, BDRV_O_RDWR, &local_err);
ret = bdrv_file_open(&bs, filename, NULL, NULL, BDRV_O_RDWR, &local_err);
if (ret < 0) {
error_propagate(errp, local_err);
return ret;

4
block/qed.c
View File

@ -563,8 +563,8 @@ static int qed_create(const char *filename, uint32_t cluster_size,
return ret;
}
ret = bdrv_file_open(&bs, filename, NULL, BDRV_O_RDWR | BDRV_O_CACHE_WB,
&local_err);
ret = bdrv_file_open(&bs, filename, NULL, NULL,
BDRV_O_RDWR | BDRV_O_CACHE_WB, &local_err);
if (ret < 0) {
qerror_report_err(local_err);
error_free(local_err);

4
block/sheepdog.c
View File

@ -1534,7 +1534,7 @@ static int sd_prealloc(const char *filename)
Error *local_err = NULL;
int ret;
ret = bdrv_file_open(&bs, filename, NULL, BDRV_O_RDWR, &local_err);
ret = bdrv_file_open(&bs, filename, NULL, NULL, BDRV_O_RDWR, &local_err);
if (ret < 0) {
qerror_report_err(local_err);
error_free(local_err);
@ -1695,7 +1695,7 @@ static int sd_create(const char *filename, QEMUOptionParameter *options,
goto out;
}
ret = bdrv_file_open(&bs, backing_file, NULL, 0, &local_err);
ret = bdrv_file_open(&bs, backing_file, NULL, NULL, 0, &local_err);
if (ret < 0) {
qerror_report_err(local_err);
error_free(local_err);

2
block/vhdx.c
View File

@ -1797,7 +1797,7 @@ static int vhdx_create(const char *filename, QEMUOptionParameter *options,
goto exit;
}
ret = bdrv_file_open(&bs, filename, NULL, BDRV_O_RDWR, &local_err);
ret = bdrv_file_open(&bs, filename, NULL, NULL, BDRV_O_RDWR, &local_err);
if (ret < 0) {
error_propagate(errp, local_err);
goto exit;

8
block/vmdk.c
View File

@ -769,8 +769,8 @@ static int vmdk_parse_extents(const char *desc, BlockDriverState *bs,
path_combine(extent_path, sizeof(extent_path),
desc_file_path, fname);
ret = bdrv_file_open(&extent_file, extent_path, NULL, bs->open_flags,
errp);
ret = bdrv_file_open(&extent_file, extent_path, NULL, NULL,
bs->open_flags, errp);
if (ret) {
return ret;
}
@ -1469,7 +1469,7 @@ static int vmdk_create_extent(const char *filename, int64_t filesize,
goto exit;
}
ret = bdrv_file_open(&bs, filename, NULL, BDRV_O_RDWR, &local_err);
ret = bdrv_file_open(&bs, filename, NULL, NULL, BDRV_O_RDWR, &local_err);
if (ret < 0) {
error_propagate(errp, local_err);
goto exit;
@ -1807,7 +1807,7 @@ static int vmdk_create(const char *filename, QEMUOptionParameter *options,
goto exit;
}
}
ret = bdrv_file_open(&new_bs, filename, NULL, BDRV_O_RDWR, &local_err);
ret = bdrv_file_open(&new_bs, filename, NULL, NULL, BDRV_O_RDWR, &local_err);
if (ret < 0) {
error_setg_errno(errp, -ret, "Could not write description");
goto exit;

3
include/block/block.h
View File

@ -184,7 +184,8 @@ void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top);
int bdrv_parse_cache_flags(const char *mode, int *flags);
int bdrv_parse_discard_flags(const char *mode, int *flags);
int bdrv_file_open(BlockDriverState **pbs, const char *filename,
QDict *options, int flags, Error **errp);
const char *reference, QDict *options, int flags,
Error **errp);
int bdrv_open_backing_file(BlockDriverState *bs, QDict *options, Error **errp);
int bdrv_open(BlockDriverState *bs, const char *filename, QDict *options,
int flags, BlockDriver *drv, Error **errp);

2
qemu-io.c
View File

@ -59,7 +59,7 @@ static int openfile(char *name, int flags, int growable, QDict *opts)
}
if (growable) {
if (bdrv_file_open(&qemuio_bs, name, opts, flags, &local_err)) {
if (bdrv_file_open(&qemuio_bs, name, NULL, opts, flags, &local_err)) {
fprintf(stderr, "%s: can't open device %s: %s\n", progname, name,
error_get_pretty(local_err));
error_free(local_err);