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block: Add Error parameter to bdrv_find_protocol()

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The argument given to bdrv_find_protocol() is just a file name, which
makes it difficult for the caller to reconstruct what protocol
bdrv_find_protocol() was hoping to find. This patch adds an Error
parameter to that function to solve this issue.

Suggested-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-id: 1423162705-32065-4-git-send-email-mreitz@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Max Reitz 2015-02-05 13:58:12 -05:00 committed by Stefan Hajnoczi
parent ca49a4fdb3
commit b65a5e12a4
5 changed files with 19 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
block.c
View File

@ -508,9 +508,8 @@ int bdrv_create_file(const char *filename, QemuOpts *opts, Error **errp)
Error *local_err = NULL;
int ret;
drv = bdrv_find_protocol(filename, true);
drv = bdrv_find_protocol(filename, true, errp);
if (drv == NULL) {
error_setg(errp, "Could not find protocol for file '%s'", filename);
return -ENOENT;
}
@ -628,7 +627,8 @@ static BlockDriver *find_hdev_driver(const char *filename)
}
BlockDriver *bdrv_find_protocol(const char *filename,
bool allow_protocol_prefix)
bool allow_protocol_prefix,
Error **errp)
{
BlockDriver *drv1;
char protocol[128];
@ -666,6 +666,8 @@ BlockDriver *bdrv_find_protocol(const char *filename,
return drv1;
}
}
error_setg(errp, "Unknown protocol '%s'", protocol);
return NULL;
}
@ -1136,9 +1138,8 @@ static int bdrv_fill_options(QDict **options, const char **pfilename, int flags,
} else {
if (!drvname && protocol) {
if (filename) {
drv = bdrv_find_protocol(filename, parse_filename);
drv = bdrv_find_protocol(filename, parse_filename, errp);
if (!drv) {
error_setg(errp, "Unknown protocol");
return -EINVAL;
}
@ -5623,9 +5624,8 @@ void bdrv_img_create(const char *filename, const char *fmt,
return;
}
proto_drv = bdrv_find_protocol(filename, true);
proto_drv = bdrv_find_protocol(filename, true, errp);
if (!proto_drv) {
error_setg(errp, "Unknown protocol '%s'", filename);
return;
}

2
block/sheepdog.c
View File

@ -1730,7 +1730,7 @@ static int sd_create(const char *filename, QemuOpts *opts,
BlockDriver *drv;
/* Currently, only Sheepdog backing image is supported. */
drv = bdrv_find_protocol(backing_file, true);
drv = bdrv_find_protocol(backing_file, true, NULL);
if (!drv || strcmp(drv->protocol_name, "sheepdog") != 0) {
error_setg(errp, "backing_file must be a sheepdog image");
ret = -EINVAL;

3
include/block/block.h
View File

@ -168,7 +168,8 @@ void bdrv_io_limits_disable(BlockDriverState *bs);
void bdrv_init(void);
void bdrv_init_with_whitelist(void);
BlockDriver *bdrv_find_protocol(const char *filename,
bool allow_protocol_prefix);
bool allow_protocol_prefix,
Error **errp);
BlockDriver *bdrv_find_format(const char *format_name);
BlockDriver *bdrv_find_whitelisted_format(const char *format_name,
bool readonly);

11
qemu-img.c
View File

@ -261,6 +261,7 @@ static int print_block_option_help(const char *filename, const char *fmt)
{
BlockDriver *drv, *proto_drv;
QemuOptsList *create_opts = NULL;
Error *local_err = NULL;
/* Find driver and parse its options */
drv = bdrv_find_format(fmt);
@ -271,9 +272,10 @@ static int print_block_option_help(const char *filename, const char *fmt)
create_opts = qemu_opts_append(create_opts, drv->create_opts);
if (filename) {
proto_drv = bdrv_find_protocol(filename, true);
proto_drv = bdrv_find_protocol(filename, true, &local_err);
if (!proto_drv) {
error_report("Unknown protocol '%s'", filename);
qerror_report_err(local_err);
error_free(local_err);
qemu_opts_free(create_opts);
return 1;
}
@ -1524,9 +1526,10 @@ static int img_convert(int argc, char **argv)
goto out;
}
proto_drv = bdrv_find_protocol(out_filename, true);
proto_drv = bdrv_find_protocol(out_filename, true, &local_err);
if (!proto_drv) {
error_report("Unknown protocol '%s'", out_filename);
qerror_report_err(local_err);
error_free(local_err);
ret = -1;
goto out;
}

4
tests/qemu-iotests/051.out
View File

@ -323,10 +323,10 @@ QEMU_PROG: -drive file=TEST_DIR/t.qcow2,readonly=on,read-only=off: 'read-only' a
=== Parsing protocol from file name ===
Testing: -hda foo:bar
QEMU_PROG: -hda foo:bar: could not open disk image foo:bar: Unknown protocol
QEMU_PROG: -hda foo:bar: could not open disk image foo:bar: Unknown protocol 'foo'
Testing: -drive file=foo:bar
QEMU_PROG: -drive file=foo:bar: could not open disk image foo:bar: Unknown protocol
QEMU_PROG: -drive file=foo:bar: could not open disk image foo:bar: Unknown protocol 'foo'
Testing: -drive file.filename=foo:bar
QEMU_PROG: -drive file.filename=foo:bar: could not open disk image ide0-hd0: Could not open 'foo:bar': No such file or directory