Messages in this thread | | | Date | Tue, 8 Oct 2013 18:38:47 -0700 | Subject | Re: [RFC][PATCH 10/13] make dump_emit() use vfs_write() instead of banging at ->f_op->write directly | From | Linus Torvalds <> |
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On Tue, Oct 8, 2013 at 6:18 PM, Al Viro <viro@zeniv.linux.org.uk> wrote: > > Point, but I would argue that we should yell very loud if we get 0 from > vfs_write() for non-zero size. I'm not sure if POSIX allows write(2) > to return that, but a lot of userland code won't be expecting that and > won't be able to cope...
Actually POSIX very much allows zero returns. O_NDELAY is mentioned as a possible cause, in addition to zero-sized writes themselves, of course.
Also, writing to (but not past) the end of a block device returns 0 for "end of device", iirc.
Linus
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