diff options
| author | Max Reitz <mreitz@redhat.com> | 2017-05-22 21:52:16 +0200 |
|---|---|---|
| committer | Max Reitz <mreitz@redhat.com> | 2017-05-29 15:39:54 +0200 |
| commit | 03c320d803fd881736b63015048498cf97d410d3 (patch) | |
| tree | 199fc077b80bfc4855ae67332e72cdda9456709b /block/file-win32.c | |
| parent | 0d54a6fed3ebaf0e17656a712e5d6575c712459b (diff) | |
block/file-*: *_parse_filename() and colons
The file drivers' *_parse_filename() implementations just strip the
optional protocol prefix off the filename. However, for e.g.
"file:foo:bar", this would lead to "foo:bar" being stored as the BDS's
filename which looks like it should be managed using the "foo" protocol.
This is especially troublesome if you then try to resolve a backing
filename based on "foo:bar".
This issue can only occur if the stripped part is a relative filename
("file:/foo:bar" will be shortened to "/foo:bar" and having a slash
before the first colon means that "/foo" is not recognized as a protocol
part). Therefore, we can easily fix it by prepending "./" to such
filenames.
Before this patch:
$ ./qemu-img create -f qcow2 backing.qcow2 64M
Formatting 'backing.qcow2', fmt=qcow2 size=67108864 encryption=off
cluster_size=65536 lazy_refcounts=off refcount_bits=16
$ ./qemu-img create -f qcow2 -b backing.qcow2 file:top:image.qcow2
Formatting 'file:top:image.qcow2', fmt=qcow2 size=67108864
backing_file=backing.qcow2 encryption=off cluster_size=65536
lazy_refcounts=off refcount_bits=16
$ ./qemu-io file:top:image.qcow2
can't open device file:top:image.qcow2: Could not open backing file:
Unknown protocol 'top'
After this patch:
$ ./qemu-io file:top:image.qcow2
[no error]
Signed-off-by: Max Reitz <mreitz@redhat.com>
Message-id: 20170522195217.12991-3-mreitz@redhat.com
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
Diffstat (limited to 'block/file-win32.c')
| -rw-r--r-- | block/file-win32.c | 12 |
1 files changed, 2 insertions, 10 deletions
diff --git a/block/file-win32.c b/block/file-win32.c index 8f14f0bdcd..ef2910b03f 100644 --- a/block/file-win32.c +++ b/block/file-win32.c @@ -276,12 +276,7 @@ static void raw_parse_flags(int flags, bool use_aio, int *access_flags, static void raw_parse_filename(const char *filename, QDict *options, Error **errp) { - /* The filename does not have to be prefixed by the protocol name, since - * "file" is the default protocol; therefore, the return value of this - * function call can be ignored. */ - strstart(filename, "file:", &filename); - - qdict_put_str(options, "filename", filename); + bdrv_parse_filename_strip_prefix(filename, "file:", options); } static QemuOptsList raw_runtime_opts = { @@ -671,10 +666,7 @@ static int hdev_probe_device(const char *filename) static void hdev_parse_filename(const char *filename, QDict *options, Error **errp) { - /* The prefix is optional, just as for "file". */ - strstart(filename, "host_device:", &filename); - - qdict_put_str(options, "filename", filename); + bdrv_parse_filename_strip_prefix(filename, "host_device:", options); } static int hdev_open(BlockDriverState *bs, QDict *options, int flags, |