From: Brian Foster <bfoster@redhat.com>
To: Al Viro <viro@zeniv.linux.org.uk>
Cc: Nhat Pham <nphamcs@gmail.com>,
akpm@linux-foundation.org, hannes@cmpxchg.org,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
willy@infradead.org, kernel-team@meta.com
Subject: Re: [PATCH v2 3/4] cachestat: implement cachestat syscall
Date: Mon, 12 Dec 2022 08:22:26 -0500 [thread overview]
Message-ID: <Y5crEpr5QWptjK17@bfoster> (raw)
In-Reply-To: <Y5UbhBTB2nSMN4UD@ZenIV>
On Sat, Dec 10, 2022 at 11:51:32PM +0000, Al Viro wrote:
> On Mon, Dec 05, 2022 at 09:51:39AM -0800, Nhat Pham wrote:
>
> > + if (!access_ok(cstat, sizeof(struct cachestat)))
> > + return -EFAULT;
>
> What for? You are using copy_to_user() later, right?
>
> > + f = fdget(fd);
> > + if (f.file) {
>
> It would be easier to read if you inverted the condition here.
>
Seconded.. I mentioned the same the last time I looked at this. On
looking again, perhaps it might even make sense to create a
filemap_cachestat() to split up the syscall bits from the associated map
walking bits..? That subsequently raises the question of whether a new
.c file is really necessary..
Brian
next prev parent reply other threads:[~2022-12-12 13:22 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-12-05 17:51 [PATCH v2 0/4] cachestat: a new syscall for page cache state of files Nhat Pham
2022-12-05 17:51 ` [PATCH v2 1/4] workingset: fix confusion around eviction vs refault container Nhat Pham
2022-12-05 17:51 ` [PATCH v2 2/4] workingset: refactor LRU refault to expose refault recency check Nhat Pham
2022-12-05 23:49 ` Yu Zhao
2022-12-06 1:19 ` Nhat Pham
2022-12-06 1:28 ` Yu Zhao
2022-12-06 2:22 ` Nhat Pham
2022-12-06 2:25 ` Yu Zhao
2022-12-08 18:07 ` Nhat Pham
2022-12-06 15:22 ` Matthew Wilcox
2022-12-07 17:28 ` Nhat Pham
2022-12-05 17:51 ` [PATCH v2 3/4] cachestat: implement cachestat syscall Nhat Pham
2022-12-05 20:40 ` [lkp] [+534 bytes kernel size regression] [i386-tinyconfig] [b45ed49f9d] " kernel test robot
2022-12-05 22:20 ` Josh Triplett
2022-12-05 23:15 ` [PATCH v2 3/4] " kernel test robot
2022-12-06 4:48 ` kernel test robot
2022-12-06 4:59 ` kernel test robot
2022-12-07 1:42 ` kernel test robot
2022-12-10 23:51 ` Al Viro
2022-12-12 13:22 ` Brian Foster [this message]
2022-12-12 16:50 ` Nhat Pham
2022-12-12 16:23 ` Nhat Pham
2022-12-12 16:24 ` Matthew Wilcox
2022-12-12 16:37 ` Nhat Pham
2022-12-05 17:51 ` [PATCH v2 4/4] selftests: Add selftests for cachestat Nhat Pham
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