On Fri, 15 Apr 2005, Morten Welinder wrote:
>
> This write will failing sooner or later when someone's disk fills up.
> That'll leave someone with a truncated file.
Yes. On the other hand, we could try to do this even better, ie make the
classic write loop that handles EAGAIN.
No POSIX filesystem is supposed to return EAGAIN, but there are tons of
"POSIX enough" filesystems. Notably NFS when mounted with "intr" (which
some people think is wrong, but it tends to be better than the
alternatives if your network is flaky enough).
But yes, even just a "write failed" is good enough, except you should also
make sure that you remove the corrupt file. Sure, fsck will catch it, but
if you don't do an fsck, somebody else might decide not to write the file
out simply because "it's already there".
(This is also why we should write to a temp-file and then do an atomic
"rename()").
Linus
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