[lkml]   [2007]   [Feb]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH] aio: fix kernel bug when page is temporally busy
> If invalidate_inode_pages2_range() will return EIOCBRETRY as the patch
> "aio: fix kernel bug when page is temporally busy"

Sorry Leonid, this patch is not safe.

It returns -EIOCBRETRY without guaranteeing that kick_iocb() will be
called. This can lead to operations hanging, both AIO and calls that
come through do_sync_{read,write}.

It overwrites -EIOCBQUEUED, leading to an aio_complete() while a
retry is happening. This can lead to reference count confusion.
Double-frees, referencing freed memory, that kind of thing. This
isn't a new problem. The current code that overwrites with -EIO has
this problem. But moving to -EIOCBRETRY does introduce new behaviour
of aio_complete() and the retry path racing.

I'll have a candidate patch to address the problem of EIO being
raised on the way back up from a path which has returned -EIOCBQUEUED.

- z
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2007-02-15 19:29    [W:0.060 / U:6.532 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site