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[Qemu-devel] [PATCH 03/15] block: Enable filename option
From: |
Kevin Wolf |
Subject: |
[Qemu-devel] [PATCH 03/15] block: Enable filename option |
Date: |
Fri, 12 Apr 2013 22:47:56 +0200 |
This allows using the file.filename option instead of the string that
comes from -drive file=... and is passed around as a separate parameter.
The goal is to get rid of this parameter and use the options QDict more
consistently.
With this option you can access not only the top-level image, but
specify a filename for the backing file (currently only if no backing
file exists, but we'll allow overriding it later)
Signed-off-by: Kevin Wolf <address@hidden>
---
block.c | 31 +++++++++++++++++++++++++++----
1 file changed, 27 insertions(+), 4 deletions(-)
diff --git a/block.c b/block.c
index fc19df1..a67365e 100644
--- a/block.c
+++ b/block.c
@@ -667,10 +667,10 @@ static int bdrv_open_flags(BlockDriverState *bs, int
flags)
* Removes all processed options from *options.
*/
static int bdrv_open_common(BlockDriverState *bs, BlockDriverState *file,
- const char *filename, QDict *options,
- int flags, BlockDriver *drv)
+ QDict *options, int flags, BlockDriver *drv)
{
int ret, open_flags;
+ const char *filename;
assert(drv != NULL);
assert(bs->file == NULL);
@@ -698,6 +698,12 @@ static int bdrv_open_common(BlockDriverState *bs,
BlockDriverState *file,
bdrv_enable_copy_on_read(bs);
}
+ if (file != NULL) {
+ filename = file->filename;
+ } else {
+ filename = qdict_get_try_str(options, "filename");
+ }
+
if (filename != NULL) {
pstrcpy(bs->filename, sizeof(bs->filename), filename);
} else {
@@ -780,6 +786,18 @@ int bdrv_file_open(BlockDriverState **pbs, const char
*filename,
bs->options = options;
options = qdict_clone_shallow(options);
+ /* Fetch the file name from the options QDict if necessary */
+ if (!filename) {
+ filename = qdict_get_try_str(options, "filename");
+ } else if (filename && !qdict_haskey(options, "filename")) {
+ qdict_put(options, "filename", qstring_from_str(filename));
+ } else {
+ qerror_report(ERROR_CLASS_GENERIC_ERROR, "Can't specify 'file' and "
+ "'filename' options at the same time");
+ ret = -EINVAL;
+ goto fail;
+ }
+
/* Find the right block driver */
drvname = qdict_get_try_str(options, "driver");
if (drvname) {
@@ -816,11 +834,16 @@ int bdrv_file_open(BlockDriverState **pbs, const char
*filename,
goto fail;
}
- ret = bdrv_open_common(bs, NULL, filename, options, flags, drv);
+ ret = bdrv_open_common(bs, NULL, options, flags, drv);
if (ret < 0) {
goto fail;
}
+ /* TODO Remove once all protocols know the filename option */
+ if (qdict_haskey(options, "filename")) {
+ qdict_del(options, "filename");
+ }
+
/* Check if any unknown options were used */
if (qdict_size(options) != 0) {
const QDictEntry *entry = qdict_first(options);
@@ -1031,7 +1054,7 @@ int bdrv_open(BlockDriverState *bs, const char *filename,
QDict *options,
}
/* Open the image */
- ret = bdrv_open_common(bs, file, filename, options, flags, drv);
+ ret = bdrv_open_common(bs, file, options, flags, drv);
if (ret < 0) {
goto unlink_and_fail;
}
--
1.8.1.4
- [Qemu-devel] [PATCH 00/15] block: Overriding the backing file with -drive, Kevin Wolf, 2013/04/12
- [Qemu-devel] [PATCH 02/15] block: Add driver-specific options for backing files, Kevin Wolf, 2013/04/12
- [Qemu-devel] [PATCH 03/15] block: Enable filename option,
Kevin Wolf <=
- [Qemu-devel] [PATCH 04/15] raw-posix: Use bdrv_open options instead of filename, Kevin Wolf, 2013/04/12
- [Qemu-devel] [PATCH 05/15] raw-win32: Use bdrv_open options instead of filename, Kevin Wolf, 2013/04/12
- [Qemu-devel] [PATCH 06/15] blkdebug: Use bdrv_open options instead of filename, Kevin Wolf, 2013/04/12
- [Qemu-devel] [PATCH 07/15] blkverify: Use bdrv_open options instead of filename, Kevin Wolf, 2013/04/12
- [Qemu-devel] [PATCH 08/15] curl: Use bdrv_open options instead of filename, Kevin Wolf, 2013/04/12