On Fri, Jul 19, 2013 at 1:29 PM, Saket Sinha <[email protected]>wrote:
> We all know that system-calls are for user-space. > I have a file-system driver where I have to use system calls in > kernel-space. > > Normally, we DON'T do any high level IOs from Kernel space (file > creation/reading, and so on). But here in my driver I am stacking FS > drivers, I can't avoid this. This is partly because Linux kernel can't > handle FS stacking (this wouldn't be an issue for Windows, for instance, > which supports stacking), > > Provide complete context of what you are trying to do. > The simple (and legal) way to create a dir/file whatever is to call system > calls, like, for instance sys_mkdir. The problem is that I am not in a > context where I can call these. Because they expect a call from user mode, > while I am in kernel mode. This is even why I implemented macros such as: > https://github.com/HeisSpiter/hepunion/blob/master/fs/hepunion/hepunion.h#L399. > This one disables all checks from user mode calls, since I am in kernel. > And this allows calling system calls. > > This is not a good way so is there any alternative. > > Regards, > Saket Sinha > > _______________________________________________ > Kernelnewbies mailing list > [email protected] > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > > -- Regards, Sandeep. “To learn is to change. Education is a process that changes the learner.”
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