On Friday 02 March 2007 00:38:19 Christoph Hellwig wrote: > > Forgive me if I haven't put enough thought into it, but would it be > > useful to create a generic_fallocate() that writes zeroed pages for any > > non-existent pages in the range? I don't know how glibc currently > > implements posix_fallocate(), but maybe the kernel could do it more > > efficiently, even in generic code. Maybe we don't care, since the major > > file systems can probably do something better in their own code. > > I'd be more happy to have the write out zeroes loop in glibc. And > glibc needs to have it anyway, for older kernels. A generic_fallocate makes sense to me iff we can do it in the kernel more significantly more efficiently than in glibc, e.g. by using only a single page in page cache instead of one for each page to be preallocated. If glibc is smart enough to do an optimal implementation, I fully agree with you. Arnd <>< - To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
