On Tue, May 06, 2025 at 02:10:12PM +0200, Christoph Hellwig wrote: > On Tue, May 06, 2025 at 07:25:06PM +0800, Zhang Yi wrote: > > + if (request_mask & STATX_WRITE_ZEROES_UNMAP && > > + bdev_write_zeroes_unmap(bdev)) > > + stat->result_mask |= STATX_WRITE_ZEROES_UNMAP; > > That would be my expectation. But then again this area seems to > confuse me a lot, so maybe we'll get Christian or Dave to chim in.
Um... does STATX_WRITE_ZEROES_UNMAP protect a field somewhere? It might be nice to expose the request alignment granularity/max size/etc. Or does this flag exist solely to support discovering that FALLOC_FL_WRITE_ZEROES is supported? In which case, why not discover its existence by calling fallocate(fd, WRITE_ZEROES, 0, 0) like the other modes? --D
