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authorKevin Wolf <kwolf@redhat.com>2013-03-18 16:40:51 +0100
committerKevin Wolf <kwolf@redhat.com>2013-03-22 17:51:32 +0100
commitc2ad1b0c465a9ea8375eaff14bbd85705c673f73 (patch)
tree705456a5885c9ac7223fa2b75158e09adbc1d38f /block.c
parentf5866fa438bff586f215c137dc71edb4e0770536 (diff)
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block: Allow omitting the file name when using driver-specific options
After this patch, using -drive with an empty file name continues to open the file if driver-specific options are used. If no driver-specific options are specified, the semantics stay as it was: It defines a drive without an inserted medium. In order to achieve this, bdrv_open() must be made safe to work with a NULL filename parameter. The assumption that is made is that only block drivers which implement bdrv_parse_filename() support using driver specific options and could therefore work without a filename. These drivers must make sure to cope with NULL in their implementation of .bdrv_open() (this is only NBD for now). For all other drivers, the block layer code will make sure to error out before calling into their code - they can't possibly work without a filename. Now an NBD connection can be opened like this: qemu-system-x86_64 -drive file.driver=nbd,file.port=1234,file.host=::1 Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com>
Diffstat (limited to 'block.c')
-rw-r--r--block.c49
1 files changed, 41 insertions, 8 deletions
diff --git a/block.c b/block.c
index 2c17a34..16a92a4 100644
--- a/block.c
+++ b/block.c
@@ -688,7 +688,11 @@ static int bdrv_open_common(BlockDriverState *bs, BlockDriverState *file,
bdrv_enable_copy_on_read(bs);
}
- pstrcpy(bs->filename, sizeof(bs->filename), filename);
+ if (filename != NULL) {
+ pstrcpy(bs->filename, sizeof(bs->filename), filename);
+ } else {
+ bs->filename[0] = '\0';
+ }
if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv)) {
return -ENOTSUP;
@@ -708,6 +712,7 @@ static int bdrv_open_common(BlockDriverState *bs, BlockDriverState *file,
bdrv_swap(file, bs);
ret = 0;
} else {
+ assert(drv->bdrv_parse_filename || filename != NULL);
ret = drv->bdrv_file_open(bs, filename, options, open_flags);
}
} else {
@@ -727,6 +732,7 @@ static int bdrv_open_common(BlockDriverState *bs, BlockDriverState *file,
#ifndef _WIN32
if (bs->is_temporary) {
+ assert(filename != NULL);
unlink(filename);
}
#endif
@@ -753,14 +759,9 @@ int bdrv_file_open(BlockDriverState **pbs, const char *filename,
{
BlockDriverState *bs;
BlockDriver *drv;
+ const char *drvname;
int ret;
- drv = bdrv_find_protocol(filename);
- if (!drv) {
- QDECREF(options);
- return -ENOENT;
- }
-
/* NULL means an empty set of options */
if (options == NULL) {
options = qdict_new();
@@ -770,7 +771,26 @@ int bdrv_file_open(BlockDriverState **pbs, const char *filename,
bs->options = options;
options = qdict_clone_shallow(options);
- if (drv->bdrv_parse_filename) {
+ /* Find the right block driver */
+ drvname = qdict_get_try_str(options, "driver");
+ if (drvname) {
+ drv = bdrv_find_whitelisted_format(drvname);
+ qdict_del(options, "driver");
+ } else if (filename) {
+ drv = bdrv_find_protocol(filename);
+ } else {
+ qerror_report(ERROR_CLASS_GENERIC_ERROR,
+ "Must specify either driver or file");
+ drv = NULL;
+ }
+
+ if (!drv) {
+ ret = -ENOENT;
+ goto fail;
+ }
+
+ /* Parse the filename and open it */
+ if (drv->bdrv_parse_filename && filename) {
Error *local_err = NULL;
drv->bdrv_parse_filename(filename, options, &local_err);
if (error_is_set(&local_err)) {
@@ -779,6 +799,12 @@ int bdrv_file_open(BlockDriverState **pbs, const char *filename,
ret = -EINVAL;
goto fail;
}
+ } else if (!drv->bdrv_parse_filename && !filename) {
+ qerror_report(ERROR_CLASS_GENERIC_ERROR,
+ "The '%s' block driver requires a file name",
+ drv->format_name);
+ ret = -EINVAL;
+ goto fail;
}
ret = bdrv_open_common(bs, NULL, filename, options, flags, drv);
@@ -899,6 +925,13 @@ int bdrv_open(BlockDriverState *bs, const char *filename, QDict *options,
QEMUOptionParameter *create_options;
char backing_filename[PATH_MAX];
+ if (qdict_size(options) != 0) {
+ error_report("Can't use snapshot=on with driver-specific options");
+ ret = -EINVAL;
+ goto fail;
+ }
+ assert(filename != NULL);
+
/* if snapshot, we create a temporary backing file and open it
instead of opening 'filename' directly */