From: Al Viro <viro@ZenIV.linux.org.uk>
To: Martin Brandenburg <martin@omnibond.com>
Cc: Mike Marshall <hubcap@omnibond.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
linux-fsdevel <linux-fsdevel@vger.kernel.org>,
Stephen Rothwell <sfr@canb.auug.org.au>
Subject: Re: Orangefs ABI documentation
Date: Wed, 17 Feb 2016 23:15:24 +0000 [thread overview]
Message-ID: <20160217231524.GQ17997@ZenIV.linux.org.uk> (raw)
In-Reply-To: <20160217230900.GP17997@ZenIV.linux.org.uk>
On Wed, Feb 17, 2016 at 11:09:00PM +0000, Al Viro wrote:
> However, that doesn't prevent all unpleasantness here - giving up just as
> it's being copied to userland and going into restart. Ho-hum... How about
> the following:
> * move increment of op->attempts into the same place where we
> set "given up"
> * in addition to the check for "given up" in the request-picking loop
> (as above), fetch op->attempts before dropping op->lock
> * after having retaken op->lock (after copy_to_user()) recheck
> op->attempts instead of checking for "given up".
Crap... There's a similar problem on the other end - in
orangefs_devreq_write_iter() between the time when op has been fetched
from the hash and the time we finish copying reply from userland. Same
kind of "what it clear_... gets all way through and we resubmit it before
we get around to checking the given_up flag" problem...
Let me think a bit...
next prev parent reply other threads:[~2016-02-17 23:15 UTC|newest]
Thread overview: 111+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-15 21:46 Orangefs ABI documentation Mike Marshall
2016-01-22 7:11 ` Al Viro
2016-01-22 11:09 ` Mike Marshall
2016-01-22 16:59 ` Mike Marshall
2016-01-22 17:08 ` Al Viro
2016-01-22 17:40 ` Mike Marshall
2016-01-22 17:43 ` Al Viro
2016-01-22 18:17 ` Mike Marshall
2016-01-22 18:37 ` Al Viro
2016-01-22 19:07 ` Mike Marshall
2016-01-22 19:21 ` Mike Marshall
2016-01-22 20:04 ` Al Viro
2016-01-22 20:30 ` Mike Marshall
2016-01-23 0:12 ` Al Viro
2016-01-23 1:28 ` Al Viro
2016-01-23 2:54 ` Mike Marshall
2016-01-23 19:10 ` Al Viro
2016-01-23 19:24 ` Mike Marshall
2016-01-23 21:35 ` Mike Marshall
2016-01-23 22:05 ` Al Viro
2016-01-23 21:40 ` Al Viro
2016-01-23 22:36 ` Mike Marshall
2016-01-24 0:16 ` Al Viro
2016-01-24 4:05 ` Al Viro
2016-01-24 22:12 ` Mike Marshall
2016-01-30 17:22 ` Al Viro
2016-01-26 19:52 ` Martin Brandenburg
2016-01-30 17:34 ` Al Viro
2016-01-30 18:27 ` Al Viro
2016-02-04 23:30 ` Mike Marshall
2016-02-06 19:42 ` Al Viro
2016-02-07 1:38 ` Al Viro
2016-02-07 3:53 ` Al Viro
2016-02-07 20:01 ` [RFC] bufmap-related wait logics (Re: Orangefs ABI documentation) Al Viro
2016-02-08 22:26 ` Orangefs ABI documentation Mike Marshall
2016-02-08 23:35 ` Al Viro
2016-02-09 3:32 ` Al Viro
2016-02-09 14:34 ` Mike Marshall
2016-02-09 17:40 ` Al Viro
2016-02-09 21:06 ` Al Viro
2016-02-09 22:25 ` Mike Marshall
2016-02-11 23:36 ` Mike Marshall
2016-02-09 22:02 ` Mike Marshall
2016-02-09 22:16 ` Al Viro
2016-02-09 22:40 ` Al Viro
2016-02-09 23:13 ` Al Viro
2016-02-10 16:44 ` Al Viro
2016-02-10 21:26 ` Al Viro
2016-02-11 23:54 ` Mike Marshall
2016-02-12 0:55 ` Al Viro
2016-02-12 12:13 ` Mike Marshall
2016-02-11 0:44 ` Al Viro
2016-02-11 3:22 ` Mike Marshall
2016-02-12 4:27 ` Al Viro
2016-02-12 12:26 ` Mike Marshall
2016-02-12 18:00 ` Martin Brandenburg
2016-02-13 17:18 ` Mike Marshall
2016-02-13 17:47 ` Al Viro
2016-02-14 2:56 ` Al Viro
2016-02-14 3:46 ` [RFC] slot allocator - waitqueue use review needed (Re: Orangefs ABI documentation) Al Viro
2016-02-14 4:06 ` Al Viro
2016-02-16 2:12 ` Al Viro
2016-02-16 19:28 ` Al Viro
2016-02-14 22:31 ` Orangefs ABI documentation Mike Marshall
2016-02-14 23:43 ` Al Viro
2016-02-15 17:46 ` Mike Marshall
2016-02-15 18:45 ` Al Viro
2016-02-15 22:32 ` Martin Brandenburg
2016-02-15 23:04 ` Al Viro
2016-02-16 23:15 ` Mike Marshall
2016-02-16 23:36 ` Al Viro
2016-02-16 23:54 ` Al Viro
2016-02-17 19:24 ` Mike Marshall
2016-02-17 20:11 ` Al Viro
2016-02-17 21:17 ` Al Viro
2016-02-17 22:24 ` Mike Marshall
2016-02-17 22:40 ` Martin Brandenburg
2016-02-17 23:09 ` Al Viro
2016-02-17 23:15 ` Al Viro [this message]
2016-02-18 0:04 ` Al Viro
2016-02-18 11:11 ` Al Viro
2016-02-18 18:58 ` Mike Marshall
2016-02-18 19:20 ` Al Viro
2016-02-18 19:49 ` Martin Brandenburg
2016-02-18 20:08 ` Mike Marshall
2016-02-18 20:22 ` Mike Marshall
2016-02-18 20:38 ` Mike Marshall
2016-02-18 20:52 ` Al Viro
2016-02-18 21:50 ` Mike Marshall
2016-02-19 0:25 ` Al Viro
2016-02-19 22:11 ` Mike Marshall
2016-02-19 22:22 ` Al Viro
2016-02-20 12:14 ` Mike Marshall
2016-02-20 13:36 ` Al Viro
2016-02-22 16:20 ` Mike Marshall
2016-02-22 21:22 ` Mike Marshall
2016-02-23 21:58 ` Mike Marshall
2016-02-26 20:21 ` Mike Marshall
2016-02-19 22:32 ` Al Viro
2016-02-19 22:45 ` Martin Brandenburg
2016-02-19 22:50 ` Martin Brandenburg
2016-02-18 20:49 ` Al Viro
2016-02-15 22:47 ` Mike Marshall
2016-01-23 22:46 ` write() semantics (Re: Orangefs ABI documentation) Al Viro
2016-01-23 23:35 ` Linus Torvalds
2016-03-03 22:25 ` Mike Marshall
2016-03-04 20:55 ` Mike Marshall
2016-01-22 20:51 ` Orangefs ABI documentation Mike Marshall
2016-01-22 23:53 ` Mike Marshall
2016-01-22 19:54 ` Al Viro
2016-01-22 19:50 ` Al Viro
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