![Jeff Cody](/assets/img/avatar_default.png)
Some block drivers have multiple BlockDriver instances with identical format_name fields (e.g. gluster, nbd). Both qemu-img and qemu will use bdrv_iterate_format() to list the supported formats when a help option is invoked. As protocols and formats may register multiple drivers, redundant listings of formats occur (e.g., "Supported formats: ... gluster gluster gluster gluster ... "). Since the list of driver formats will be small, this performs a simple linear search on format_name, and ignores any duplicates. The end result change is that the iterator will no longer receive duplicate string names, nor will it receive NULL pointers. Signed-off-by: Jeff Cody <jcody@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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Read the documentation in qemu-doc.html or on http://wiki.qemu-project.org - QEMU team
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