The SLES12 tree has various patches to implement special O_DIRECT|O_NONBLOCK semantics for block devices: https://gitorious.org/opensuse/kernel-source/source/806eab3e4b02e798c1ae942440051f81c822ca35:patches.suse/block-nonblock-causes-failfast this seems genuinely useful and I'd be really happy if people would do this work upstream for two reasons: a) implementing different semantics only in a vendor kernel is a nightmare. No proper way to document it in the man pages for example, and silent breakage of applications that expect it to be present, or even more nasty not present. b) Which brings us to: we had various issues with adding O_NONBLOCK to files that didn't support it before. How well was this whole feature tested? -- To unsubscribe from this list: send the line "unsubscribe linux-man" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
