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From: David Woodhouse <dwmw2@infradead.org>
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To: Oliver Neukum <Oliver.Neukum@lrz.uni-muenchen.de>
Cc: Linus Torvalds <torvalds@transmeta.com>,
       Benjamin LaHaise <bcrl@redhat.com>,
       Roman Zippel <zippel@linux-m68k.org>,
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Subject: Re: manipulating sigmask from filesystems and drivers 
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Oliver.Neukum@lrz.uni-muenchen.de said:
>  So IMHO it would be better to limit this new kind of waiting to
> reading. 

You can do it for write() in the case where no data have yet been written, 
i.e. in prepare_write() first time round the loop. In fact, you can even 
return -ERESTARTNOINTR in that case, just as you can for read() where no 
data have yet been copied into userspace. Whether we want to special-case 
the first time round the loop just to give better responsiveness in the 
common case is debatable though.

You can also do it for open() in 2.5. (in 2.4 the read_inode API gave the
file system no choice but to return a full real inode or a bad one which
remained and prevented subsequent lookups of the same inode.)

--
dwmw2


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