Daniel Sweet db2bc43017 Use correct LOOP_CTL_GET_FREE API in pkg/loopback ... The `ioctl` interface for the `LOOP_CTL_GET_FREE` request on `/dev/loop-control` is a little different from what `unix.IoctlGetInt` expects: the first index is the returned status in `r1`, not an `int` pointer as the first parameter. Unfortunately we have to go a little lower level to get the appropriate loop device index out, using `unix.Syscall` directly to read from `r1`. Internally, the index is returned as a signed integer to match the internal `ioctl` expectations of interpreting a negative signed integer as an error at the userspace ABI boundary, so the direct interface of `ioctlLoopCtlGetFree` can remain as-is. [@kolyshkin: it still worked before this fix because of /dev scan fallback in ioctlLoopCtlGetFree()] Signed-off-by: Daniel Sweet <danieljsweet@icloud.com> Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>		2019-08-27 06:22:10 -07:00
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attach_loopback.go
ioctl.go
loop_wrapper.go
loopback.go