| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <42c5bbe-a7a4-3546-e898-3f33bd71b062@google.com>
Date: Tue, 25 Jul 2023 18:39:25 -0700 (PDT)
From: Hugh Dickins <hughd@...gle.com>
To: Jeff Layton <jlayton@...nel.org>
cc: Eric Van Hensbergen <ericvh@...nel.org>,
Latchesar Ionkov <lucho@...kov.net>,
Dominique Martinet <asmadeus@...ewreck.org>,
Christian Schoenebeck <linux_oss@...debyte.com>,
David Howells <dhowells@...hat.com>,
Marc Dionne <marc.dionne@...istor.com>,
Chris Mason <clm@...com>, Josef Bacik <josef@...icpanda.com>,
David Sterba <dsterba@...e.com>, Xiubo Li <xiubli@...hat.com>,
Ilya Dryomov <idryomov@...il.com>,
Jan Harkes <jaharkes@...cmu.edu>, coda@...cmu.edu,
Tyler Hicks <code@...icks.com>, Gao Xiang <xiang@...nel.org>,
Chao Yu <chao@...nel.org>, Yue Hu <huyue2@...lpad.com>,
Jeffle Xu <jefflexu@...ux.alibaba.com>,
Namjae Jeon <linkinjeon@...nel.org>,
Sungjong Seo <sj1557.seo@...sung.com>,
Jan Kara <jack@...e.com>, Theodore Ts'o <tytso@....edu>,
Andreas Dilger <adilger.kernel@...ger.ca>,
Jaegeuk Kim <jaegeuk@...nel.org>,
OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>,
Miklos Szeredi <miklos@...redi.hu>,
Bob Peterson <rpeterso@...hat.com>,
Andreas Gruenbacher <agruenba@...hat.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Tejun Heo <tj@...nel.org>,
Alexander Viro <viro@...iv.linux.org.uk>,
Christian Brauner <brauner@...nel.org>,
Trond Myklebust <trond.myklebust@...merspace.com>,
Anna Schumaker <anna@...nel.org>,
Konstantin Komarov <almaz.alexandrovich@...agon-software.com>,
Mark Fasheh <mark@...heh.com>,
Joel Becker <jlbec@...lplan.org>,
Joseph Qi <joseph.qi@...ux.alibaba.com>,
Mike Marshall <hubcap@...ibond.com>,
Martin Brandenburg <martin@...ibond.com>,
Luis Chamberlain <mcgrof@...nel.org>,
Kees Cook <keescook@...omium.org>,
Iurii Zaikin <yzaikin@...gle.com>,
Steve French <sfrench@...ba.org>,
Paulo Alcantara <pc@...guebit.com>,
Ronnie Sahlberg <lsahlber@...hat.com>,
Shyam Prasad N <sprasad@...rosoft.com>,
Tom Talpey <tom@...pey.com>,
Sergey Senozhatsky <senozhatsky@...omium.org>,
Richard Weinberger <richard@....at>,
Hans de Goede <hdegoede@...hat.com>,
Hugh Dickins <hughd@...gle.com>,
Andrew Morton <akpm@...ux-foundation.org>,
"Darrick J. Wong" <djwong@...nel.org>,
Dave Chinner <david@...morbit.com>,
Anthony Iliopoulos <ailiop@...e.com>, v9fs@...ts.linux.dev,
linux-kernel@...r.kernel.org, linux-afs@...ts.infradead.org,
linux-btrfs@...r.kernel.org, ceph-devel@...r.kernel.org,
codalist@...a.cs.cmu.edu, ecryptfs@...r.kernel.org,
linux-erofs@...ts.ozlabs.org, linux-fsdevel@...r.kernel.org,
linux-ext4@...r.kernel.org, linux-f2fs-devel@...ts.sourceforge.net,
cluster-devel@...hat.com, linux-nfs@...r.kernel.org,
ntfs3@...ts.linux.dev, ocfs2-devel@...ts.linux.dev,
devel@...ts.orangefs.org, linux-cifs@...r.kernel.org,
samba-technical@...ts.samba.org, linux-mtd@...ts.infradead.org,
linux-mm@...ck.org, linux-xfs@...r.kernel.org
Subject: Re: [PATCH v6 3/7] tmpfs: bump the mtime/ctime/iversion when page
becomes writeable
On Tue, 25 Jul 2023, Jeff Layton wrote:
> Most filesystems that use the pagecache will update the mtime, ctime,
> and change attribute when a page becomes writeable. Add a page_mkwrite
> operation for tmpfs and just use it to bump the mtime, ctime and change
> attribute.
>
> This fixes xfstest generic/080 on tmpfs.
Huh. I didn't notice when this one crept into the multigrain series.
I'm inclined to NAK this patch: at the very least, it does not belong
in the series, but should be discussed separately.
Yes, tmpfs does not and never has used page_mkwrite, and gains some
performance advantage from that. Nobody has ever asked for this
change before, or not that I recall.
Please drop it from the series: and if you feel strongly, or know
strong reasons why tmpfs suddenly needs to use page_mkwrite now,
please argue them separately. To pass generic/080 is not enough.
Thanks,
Hugh
>
> Signed-off-by: Jeff Layton <jlayton@...nel.org>
> ---
> mm/shmem.c | 12 ++++++++++++
> 1 file changed, 12 insertions(+)
>
> diff --git a/mm/shmem.c b/mm/shmem.c
> index b154af49d2df..654d9a585820 100644
> --- a/mm/shmem.c
> +++ b/mm/shmem.c
> @@ -2169,6 +2169,16 @@ static vm_fault_t shmem_fault(struct vm_fault *vmf)
> return ret;
> }
>
> +static vm_fault_t shmem_page_mkwrite(struct vm_fault *vmf)
> +{
> + struct vm_area_struct *vma = vmf->vma;
> + struct inode *inode = file_inode(vma->vm_file);
> +
> + file_update_time(vma->vm_file);
> + inode_inc_iversion(inode);
> + return 0;
> +}
> +
> unsigned long shmem_get_unmapped_area(struct file *file,
> unsigned long uaddr, unsigned long len,
> unsigned long pgoff, unsigned long flags)
> @@ -4210,6 +4220,7 @@ static const struct super_operations shmem_ops = {
>
> static const struct vm_operations_struct shmem_vm_ops = {
> .fault = shmem_fault,
> + .page_mkwrite = shmem_page_mkwrite,
> .map_pages = filemap_map_pages,
> #ifdef CONFIG_NUMA
> .set_policy = shmem_set_policy,
> @@ -4219,6 +4230,7 @@ static const struct vm_operations_struct shmem_vm_ops = {
>
> static const struct vm_operations_struct shmem_anon_vm_ops = {
> .fault = shmem_fault,
> + .page_mkwrite = shmem_page_mkwrite,
> .map_pages = filemap_map_pages,
> #ifdef CONFIG_NUMA
> .set_policy = shmem_set_policy,
>
> --
> 2.41.0
Powered by blists - more mailing lists