Re: [PATCH] VFS bugfix: two read_inode() calles withoutclear_inode() call between
From: David Woodhouse
Date: Fri May 06 2005 - 06:10:04 EST
On Thu, 2005-05-05 at 18:18 +0200, Miklos Szeredi wrote:
> Using yield() to wait for a precisely defined event (clear_inode()
> finishing) doesn't seem like a very good idea. Especially, since
> Artem's patch will probably make it trigger more often.
Agreed. Even before Artem's patch, we're still effectively busy-waiting
for something which calls back into the file system's clear_inode method
and may well sleep and perform I/O.
> How about this (totally untested) patch? Even if I_LOCK is not set
> initially, wake_up_inode() should do the right thing and wake up the
> waiting task after clear_inode(). It shouldn't cause spurious
> wakeups, since there should be no other reference to the inode.
Since Artem introduced a wake_up_inode() in dispose_list(), your patch
seems reasonable.
--
dwmw2
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