From: Dominique Martinet <asmadeus@codewreck.org>
To: Matthew Wilcox <willy@infradead.org>
Cc: v9fs-developer@lists.sourceforge.net,
Latchesar Ionkov <lucho@ionkov.net>,
Eric Van Hensbergen <ericvh@gmail.com>,
linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
Ron Minnich <rminnich@sandia.gov>
Subject: Re: [V9fs-developer] [PATCH 2/6] 9p: Replace the fidlist with an IDR
Date: Wed, 11 Jul 2018 14:40:38 +0200 [thread overview]
Message-ID: <20180711124038.GB835@nautica> (raw)
In-Reply-To: <20180628132629.3148-3-willy@infradead.org>
Matthew Wilcox wrote on Thu, Jun 28, 2018:
> diff --git a/net/9p/client.c b/net/9p/client.c
> index f8d58b0852fe..bbab82f22c20 100644
> --- a/net/9p/client.c
> +++ b/net/9p/client.c
> @@ -908,30 +908,27 @@ static struct p9_fid *p9_fid_create(struct p9_client *clnt)
> {
> int ret;
> struct p9_fid *fid;
> - unsigned long flags;
>
> p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt);
> fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
> if (!fid)
> return NULL;
>
> - ret = p9_idpool_get(clnt->fidpool);
> - if (ret < 0)
> - goto error;
> - fid->fid = ret;
> -
> memset(&fid->qid, 0, sizeof(struct p9_qid));
> fid->mode = -1;
> fid->uid = current_fsuid();
> fid->clnt = clnt;
> fid->rdir = NULL;
> - spin_lock_irqsave(&clnt->lock, flags);
> - list_add(&fid->flist, &clnt->fidlist);
> - spin_unlock_irqrestore(&clnt->lock, flags);
>
> - return fid;
> + idr_preload(GFP_KERNEL);
> + spin_lock_irq(&clnt->lock);
> + ret = idr_alloc_u32(&clnt->fids, fid, &fid->fid, UINT_MAX, GFP_NOWAIT);
There's also a P9_NOFID that we shouldn't use, so the max here should be
P9_NOFID - 1
That aside this introduces a change of behaviour that fid used to be
alloc'd linearily from 0 which no longer holds true, that breaks one
serveur (nfs-ganesha just returns ERANGE) but others seem to handle this
just fine so they'll just need to fix that server.
max aside this looks good.
--
Dominique Martinet
next prev parent reply other threads:[~2018-07-11 12:45 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-28 13:26 [PATCH 0/6] 9p: Use IDRs more effectively Matthew Wilcox
2018-06-28 13:26 ` [PATCH 1/6] 9p: Change p9_fid_create calling convention Matthew Wilcox
2018-06-28 13:26 ` [PATCH 2/6] 9p: Replace the fidlist with an IDR Matthew Wilcox
2018-07-11 12:40 ` Dominique Martinet [this message]
2018-07-11 12:52 ` [V9fs-developer] " Matthew Wilcox
2018-07-11 12:58 ` Dominique Martinet
2018-07-11 13:08 ` Matthew Wilcox
2018-06-28 13:26 ` [PATCH 3/6] 9p: Embed wait_queue_head into p9_req_t Matthew Wilcox
2018-06-28 13:26 ` [PATCH 4/6] 9p: Remove an unnecessary memory barrier Matthew Wilcox
2018-06-28 13:40 ` [V9fs-developer] " Dominique Martinet
2018-06-28 14:03 ` Matthew Wilcox
2018-06-28 14:33 ` Dominique Martinet
2018-06-28 13:26 ` [PATCH 5/6] 9p: Use a slab for allocating requests Matthew Wilcox
2018-07-11 13:33 ` [V9fs-developer] " Dominique Martinet
2018-07-11 14:13 ` Matthew Wilcox
2018-07-11 14:24 ` Dominique Martinet
2018-06-28 13:26 ` [PATCH 6/6] 9p: Remove p9_idpool Matthew Wilcox
2018-07-11 13:38 ` [V9fs-developer] [PATCH 0/6] 9p: Use IDRs more effectively Dominique Martinet
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