Linux-NFS Archive on lore.kernel.org
 help / color / Atom feed
From: Luis Henriques <lhenriques@suse.com>
To: Olga Kornievskaia <olga.kornievskaia@gmail.com>
Cc: willy@infradead.org, david@fromorbit.com,
	"Darrick J. Wong" <darrick.wong@oracle.com>,
	linux-fsdevel@vger.kernel.org, linux-xfs@vger.kernel.org,
	linux-nfs <linux-nfs@vger.kernel.org>,
	linux-unionfs@vger.kernel.org, ceph-devel@vger.kernel.org,
	linux-cifs@vger.kernel.org
Subject: Re: [PATCH 04/11] vfs: add missing checks to copy_file_range
Date: Thu, 13 Dec 2018 10:29:52 +0000
Message-ID: <87bm5pra73.fsf@suse.com> (raw)
In-Reply-To: <CAN-5tyGmdrbbiej_mMosYKrCzOEuKMKJALfOJxvbBqHwZFiUOw@mail.gmail.com>

Olga Kornievskaia <olga.kornievskaia@gmail.com> writes:

> On Wed, Dec 12, 2018 at 2:43 PM Matthew Wilcox <willy@infradead.org> wrote:
>>
>> On Wed, Dec 12, 2018 at 01:55:28PM -0500, Olga Kornievskaia wrote:
>> > On Wed, Dec 12, 2018 at 6:31 AM Luis Henriques <lhenriques@suse.com> wrote:
>> > > I was wondering if, with the above check, it would make sense to also
>> > > have an extra patch changing some filesystems (ceph, nfs and cifs) to
>> > > simply return -EOPNOTSUPP (instead of -EINVAL) when inode_in ==
>> > > inode_out.  Something like the diff below (not tested!).
>>
>> > > +++ b/fs/nfs/nfs4file.c
>> > > @@ -136,7 +136,7 @@ static ssize_t nfs4_copy_file_range(struct file *file_in, loff_t pos_in,
>> > >         ssize_t ret;
>> > >
>> > >         if (file_inode(file_in) == file_inode(file_out))
>> > > -               return -EINVAL;
>> > > +               return -EOPNOTSUPP;
>> >
>> > Please don't change the NFS bits. This is against the NFS
>> > specifications. RFC 7862 15.2.3
>> >
>> > (snippet)
>> > SAVED_FH and CURRENT_FH must be different files.  If SAVED_FH and
>> >    CURRENT_FH refer to the same file, the operation MUST fail with
>> >    NFS4ERR_INVAL.
>>
>> I don't see how that applies.  That refers to a requirement _in the
>> protocol_ that determines what the server MUST do if the client sends
>> it two FHs which refer to the same file.
>>
>> What we're talking about here is how a Linux filesystem behaves when
>> receiving a copy_file_range() referring to the same file.  As long as
>> the Linux filesystem doesn't react by sending out one of these invalid
>> protocol messages, I don't see the problem.
>
> Ok then this should be changed to call generic_copy_file_range() not
> returning the EOPNOTSUPP since there is no longer fallback in vfs to
> call the generic_copy_file_range() and in turn responsibility of each
> file system.

Ah, I didn't look close enough and didn't realised the nfs code was
doing something slightly different from the other 2 FSs.  In that case
simply deleting that check seems to be enough to fallback to the vfs
generic_copy_file_range.

Anyway, please find below an updated patch (with proper changelog).

Cheers,
-- 
Luis

From f66a07e22dc93827bdafc1666d4980edc986bce4 Mon Sep 17 00:00:00 2001
From: Luis Henriques <lhenriques@suse.com>
Date: Thu, 13 Dec 2018 10:19:54 +0000
Subject: [PATCH] vfs: fallback to generic_copy_file_range if copying within
 the same file

If source and destination inode are the same simply fallback to the VFS
generic_copy_file_range, as we've already checked overlapping areas in
generic_copy_file_checks.

Signed-off-by: Luis Henriques <lhenriques@suse.com>
---
 fs/ceph/file.c    | 2 +-
 fs/cifs/cifsfs.c  | 2 +-
 fs/nfs/nfs4file.c | 3 ---
 3 files changed, 2 insertions(+), 5 deletions(-)

diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index eb876e19c1dc..ff48dc52c30e 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -1904,7 +1904,7 @@ static ssize_t __ceph_copy_file_range(struct file *src_file, loff_t src_off,
 	bool do_final_copy = false;
 
 	if (src_inode == dst_inode)
-		return -EINVAL;
+		return -EOPNOTSUPP;
 	if (src_inode->i_sb != dst_inode->i_sb)
 		return -EXDEV;
 	if (ceph_snap(dst_inode) != CEPH_NOSNAP)
diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index 03e4b9eacbd1..3c66454c59b6 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -1068,7 +1068,7 @@ ssize_t cifs_file_copychunk_range(unsigned int xid,
 	cifs_dbg(FYI, "copychunk range\n");
 
 	if (src_inode == target_inode) {
-		rc = -EINVAL;
+		rc = -EOPNOTSUPP;
 		goto out;
 	}
 
diff --git a/fs/nfs/nfs4file.c b/fs/nfs/nfs4file.c
index 4783c0c1c49e..dc7f344849e9 100644
--- a/fs/nfs/nfs4file.c
+++ b/fs/nfs/nfs4file.c
@@ -135,9 +135,6 @@ static ssize_t nfs4_copy_file_range(struct file *file_in, loff_t pos_in,
 {
 	ssize_t ret = -EXDEV;
 
-	if (file_inode(file_in) == file_inode(file_out))
-		return -EINVAL;
-
 	/* only offload copy if superblock is the same */
 	if (file_inode(file_in)->i_sb == file_inode(file_out)->i_sb) {
 		do {

  reply index

Thread overview: 83+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-12-03  8:34 [PATCH 0/11] fs: fixes for major copy_file_range() issues Dave Chinner
2018-12-03  8:34 ` [PATCH 01/11] vfs: copy_file_range source range over EOF should fail Dave Chinner
2018-12-03 12:46   ` Amir Goldstein
2018-12-04 15:13     ` Christoph Hellwig
2018-12-04 21:29       ` Dave Chinner
2018-12-04 21:47         ` Olga Kornievskaia
2018-12-04 22:31           ` Dave Chinner
2018-12-05 16:51             ` bfields
2019-05-20  9:10             ` Amir Goldstein
2019-05-20 13:12               ` Olga Kornievskaia
2019-05-20 13:36                 ` Amir Goldstein
2019-05-20 13:58                   ` Olga Kornievskaia
2019-05-20 14:02                     ` Amir Goldstein
2018-12-05 14:12         ` Christoph Hellwig
2018-12-05 21:08           ` Dave Chinner
2018-12-05 21:30             ` Christoph Hellwig
2018-12-03  8:34 ` [PATCH 02/11] vfs: introduce generic_copy_file_range() Dave Chinner
2018-12-03 10:03   ` Amir Goldstein
2018-12-03 23:00     ` Dave Chinner
2018-12-04 15:14   ` Christoph Hellwig
2018-12-03  8:34 ` [PATCH 03/11] vfs: no fallback for ->copy_file_range Dave Chinner
2018-12-03 10:22   ` Amir Goldstein
2018-12-03 23:02     ` Dave Chinner
2018-12-06  4:16       ` Amir Goldstein
2018-12-06 21:30         ` Dave Chinner
2018-12-07  5:38           ` Amir Goldstein
2018-12-03 18:23   ` Anna Schumaker
2018-12-04 15:16   ` Christoph Hellwig
2018-12-03  8:34 ` [PATCH 04/11] vfs: add missing checks to copy_file_range Dave Chinner
2018-12-03 12:42   ` Amir Goldstein
2018-12-03 19:04   ` Darrick J. Wong
2018-12-03 21:33   ` Olga Kornievskaia
2018-12-03 23:04     ` Dave Chinner
2018-12-04 15:18   ` Christoph Hellwig
2018-12-12 11:31   ` Luis Henriques
2018-12-12 16:42     ` Darrick J. Wong
2018-12-12 18:55     ` Olga Kornievskaia
2018-12-12 19:42       ` Matthew Wilcox
2018-12-12 20:22         ` Olga Kornievskaia
2018-12-13 10:29           ` Luis Henriques [this message]
2018-12-03  8:34 ` [PATCH 05/11] vfs: use inode_permission in copy_file_range() Dave Chinner
2018-12-03 12:47   ` Amir Goldstein
2018-12-03 18:18   ` Darrick J. Wong
2018-12-03 23:55     ` Dave Chinner
2018-12-05 17:28       ` bfields
2018-12-03 18:53   ` Eric Biggers
2018-12-04 15:19   ` Christoph Hellwig
2018-12-03  8:34 ` [PATCH 06/11] vfs: copy_file_range needs to strip setuid bits Dave Chinner
2018-12-03 12:51   ` Amir Goldstein
2018-12-04 15:21   ` Christoph Hellwig
2018-12-03  8:34 ` [PATCH 07/11] vfs: copy_file_range should update file timestamps Dave Chinner
2018-12-03 10:47   ` Amir Goldstein
2018-12-03 17:33     ` Olga Kornievskaia
2018-12-03 18:22       ` Darrick J. Wong
2018-12-03 23:19     ` Dave Chinner
2018-12-04 15:24   ` Christoph Hellwig
2018-12-03  8:34 ` [PATCH 08/11] vfs: push EXDEV check down into ->remap_file_range Dave Chinner
2018-12-03 11:04   ` Amir Goldstein
2018-12-03 19:11     ` Darrick J. Wong
2018-12-03 23:37       ` Dave Chinner
2018-12-03 23:58         ` Darrick J. Wong
2018-12-04  9:17           ` Amir Goldstein
2018-12-03 23:34     ` Dave Chinner
2018-12-03 18:24   ` Darrick J. Wong
2018-12-04  8:18   ` Olga Kornievskaia
2018-12-03  8:34 ` [PATCH 09/11] vfs: push copy_file_ranges -EXDEV checks down Dave Chinner
2018-12-03 12:36   ` Amir Goldstein
2018-12-03 17:58   ` Olga Kornievskaia
2018-12-03 18:53   ` Anna Schumaker
2018-12-03 19:27     ` Olga Kornievskaia
2018-12-03 23:40     ` Dave Chinner
2018-12-04 15:43   ` Christoph Hellwig
2018-12-04 22:18     ` Dave Chinner
2018-12-04 23:33       ` Olga Kornievskaia
2018-12-05 14:09       ` Christoph Hellwig
2018-12-05 17:01         ` Olga Kornievskaia
2018-12-03  8:34 ` [PATCH 10/11] vfs: allow generic_copy_file_range to copy across devices Dave Chinner
2018-12-03 12:54   ` Amir Goldstein
2018-12-03  8:34 ` [PATCH 11/11] ovl: allow cross-device copy_file_range calls Dave Chinner
2018-12-03 12:55   ` Amir Goldstein
2018-12-03  8:39 ` [PATCH 12/11] man-pages: copy_file_range updates Dave Chinner
2018-12-03 13:05   ` Amir Goldstein
2019-05-21  5:52   ` Amir Goldstein

Reply instructions:

You may reply publically to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=87bm5pra73.fsf@suse.com \
    --to=lhenriques@suse.com \
    --cc=ceph-devel@vger.kernel.org \
    --cc=darrick.wong@oracle.com \
    --cc=david@fromorbit.com \
    --cc=linux-cifs@vger.kernel.org \
    --cc=linux-fsdevel@vger.kernel.org \
    --cc=linux-nfs@vger.kernel.org \
    --cc=linux-unionfs@vger.kernel.org \
    --cc=linux-xfs@vger.kernel.org \
    --cc=olga.kornievskaia@gmail.com \
    --cc=willy@infradead.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Linux-NFS Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-nfs/0 linux-nfs/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-nfs linux-nfs/ https://lore.kernel.org/linux-nfs \
		linux-nfs@vger.kernel.org linux-nfs@archiver.kernel.org
	public-inbox-index linux-nfs


Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-nfs


AGPL code for this site: git clone https://public-inbox.org/ public-inbox