simplify interop with file_operations

[mmacy]

Summary

There are a couple of issues

• loff_t is defined as long long on Linux. On FreeBSD it's defined as long. For all intents and purposes we only care about 64-bit so we'll just pretend like that always DTRT. It would be easier to interoperate with FreeBSD code if we just used off_t. I could go either way and convert the debugfs consumer back to using loff_t if we agree to actually use the type Linux uses.

• struct linux_file is what we actually pass around, using struct file and redefining it leads to conflicts in build, let's just use linux_file.

[mmacy]

@hselasky ping

[• hselasky]

Did you do a LINT build to make sure nothing gets broken by this patch for both i386 and amd64?

[• hselasky]

If you grep for llseek you'll see it is used a couple of places in sys/ofed .

[mmacy]

In D19274#413106, @hselasky wrote:

If you grep for llseek you'll see it is used a couple of places in sys/ofed .

I will do a make tinderbox for the two

[mmacy]

• update to fix LINT

Build works now giving loff_t a correct definition (negative offsets are possible)