From: "Darrick J. Wong" <darrick.wong@oracle.com>
To: Amir Goldstein <amir73il@gmail.com>
Cc: Dave Chinner <david@fromorbit.com>,
Eric Sandeen <sandeen@redhat.com>,
Linux NFS Mailing List <linux-nfs@vger.kernel.org>,
linux-cifs@vger.kernel.org,
overlayfs <linux-unionfs@vger.kernel.org>,
linux-xfs <linux-xfs@vger.kernel.org>,
Linux MM <linux-mm@kvack.org>,
Linux Btrfs <linux-btrfs@vger.kernel.org>,
linux-fsdevel <linux-fsdevel@vger.kernel.org>,
ocfs2-devel@oss.oracle.com
Subject: Re: [PATCH 17/25] vfs: enable remap callers that can handle short operations
Date: Thu, 11 Oct 2018 09:04:11 -0700 [thread overview]
Message-ID: <20181011160411.GA28243@magnolia> (raw)
In-Reply-To: <CAOQ4uxgbTf0Po3stK4YZWqYPWTmwfqsSLGwV4p4be6gBrdLP+g@mail.gmail.com>
On Thu, Oct 11, 2018 at 08:15:42AM +0300, Amir Goldstein wrote:
> On Thu, Oct 11, 2018 at 7:14 AM Darrick J. Wong <darrick.wong@oracle.com> wrote:
> >
> > From: Darrick J. Wong <darrick.wong@oracle.com>
> >
> > Plumb in a remap flag that enables the filesystem remap handler to
> > shorten remapping requests for callers that can handle it. Now
> > copy_file_range can report partial success (in case we run up against
> > alignment problems, resource limits, etc.).
> >
> > Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
> > Reviewed-by: Amir Goldstein <amir73il@gmail.com>
> > ---
> > fs/read_write.c | 15 +++++++++------
> > include/linux/fs.h | 7 +++++--
> > mm/filemap.c | 16 ++++++++++++----
> > 3 files changed, 26 insertions(+), 12 deletions(-)
> >
> >
> > diff --git a/fs/read_write.c b/fs/read_write.c
> > index 6ec908f9a69b..3713893b7e38 100644
> > --- a/fs/read_write.c
> > +++ b/fs/read_write.c
> > @@ -1593,7 +1593,8 @@ ssize_t vfs_copy_file_range(struct file *file_in, loff_t pos_in,
> >
> > cloned = file_in->f_op->remap_file_range(file_in, pos_in,
> > file_out, pos_out,
> > - min_t(loff_t, MAX_RW_COUNT, len), 0);
> > + min_t(loff_t, MAX_RW_COUNT, len),
> > + RFR_CAN_SHORTEN);
> > if (cloned > 0) {
> > ret = cloned;
> > goto done;
> > @@ -1804,16 +1805,18 @@ int generic_remap_file_range_prep(struct file *file_in, loff_t pos_in,
> > * If the user is attempting to remap a partial EOF block and
> > * it's inside the destination EOF then reject it.
> > *
> > - * We don't support shortening requests, so we can only reject
> > - * them.
> > + * If possible, shorten the request instead of rejecting it.
> > */
> > if (is_dedupe)
> > ret = -EBADE;
> > else if (pos_out + *len < i_size_read(inode_out))
> > ret = -EINVAL;
> >
> > - if (ret)
> > - return ret;
> > + if (ret) {
> > + if (!(remap_flags & RFR_CAN_SHORTEN))
> > + return ret;
> > + *len &= ~blkmask;
> > + }
> > }
> >
> > return 1;
> > @@ -2112,7 +2115,7 @@ int vfs_dedupe_file_range(struct file *file, struct file_dedupe_range *same)
> >
> > deduped = vfs_dedupe_file_range_one(file, off, dst_file,
> > info->dest_offset, len,
> > - 0);
> > + RFR_CAN_SHORTEN);
>
> You did not update WARN_ON_ONCE in vfs_dedupe_file_range_one()
> to allow this flag and did not mention dedupe in commit message.
> Was that change intentional in this patch?
>
> After RFR_SHORT_DEDUPE patch the end result in fine.
Heh, oops, sorry about that. I'll reissue the patch with the two
corrections.
--D
> Thanks,
> Amir.
next prev parent reply other threads:[~2018-10-11 16:04 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-11 4:12 [PATCH v3 00/25] fs: fixes for serious clone/dedupe problems Darrick J. Wong
2018-10-11 4:12 ` [PATCH 01/25] xfs: add a per-xfs trace_printk macro Darrick J. Wong
2018-10-11 13:39 ` Christoph Hellwig
2018-10-11 23:34 ` Darrick J. Wong
2018-10-11 4:12 ` [PATCH 02/25] vfs: vfs_clone_file_prep_inodes should return EINVAL for a clone from beyond EOF Darrick J. Wong
2018-10-11 13:40 ` Christoph Hellwig
2018-10-11 4:12 ` [PATCH 03/25] vfs: check file ranges before cloning files Darrick J. Wong
2018-10-11 13:42 ` Christoph Hellwig
2018-10-11 14:13 ` Amir Goldstein
2018-10-11 4:12 ` [PATCH 04/25] vfs: strengthen checking of file range inputs to generic_remap_checks Darrick J. Wong
2018-10-11 13:43 ` Christoph Hellwig
2018-10-11 4:12 ` [PATCH 05/25] vfs: avoid problematic remapping requests into partial EOF block Darrick J. Wong
2018-10-12 0:16 ` Dave Chinner
2018-10-12 16:07 ` Darrick J. Wong
2018-10-12 20:22 ` Filipe Manana
2018-10-15 0:31 ` Dave Chinner
2018-11-02 12:04 ` Filipe Manana
2018-11-02 17:42 ` Darrick J. Wong
2018-11-02 18:18 ` Filipe Manana
2018-11-02 19:05 ` Filipe Manana
2018-10-11 4:13 ` [PATCH 06/25] vfs: skip zero-length dedupe requests Darrick J. Wong
2018-10-11 4:13 ` [PATCH 07/25] vfs: combine the clone and dedupe into a single remap_file_range Darrick J. Wong
2018-10-11 4:13 ` [PATCH 08/25] vfs: rename vfs_clone_file_prep to be more descriptive Darrick J. Wong
2018-10-11 4:13 ` [PATCH 09/25] vfs: rename clone_verify_area to remap_verify_area Darrick J. Wong
2018-10-11 4:13 ` [PATCH 10/25] vfs: create generic_remap_file_range_touch to update inode metadata Darrick J. Wong
2018-10-11 4:13 ` [PATCH 11/25] vfs: pass remap flags to generic_remap_file_range_prep Darrick J. Wong
2018-10-11 4:13 ` [PATCH 12/25] vfs: pass remap flags to generic_remap_checks Darrick J. Wong
2018-10-11 4:13 ` [PATCH 13/25] vfs: make remap_file_range functions take and return bytes completed Darrick J. Wong
2018-10-11 4:14 ` [PATCH 14/25] vfs: plumb RFR_* remap flags through the vfs clone functions Darrick J. Wong
2018-10-11 4:14 ` [PATCH 15/25] vfs: plumb RFR_* remap flags through the vfs dedupe functions Darrick J. Wong
2018-10-11 4:14 ` [PATCH 16/25] vfs: make remapping to source file eof more explicit Darrick J. Wong
2018-10-11 4:14 ` [PATCH 17/25] vfs: enable remap callers that can handle short operations Darrick J. Wong
2018-10-11 5:15 ` Amir Goldstein
2018-10-11 16:04 ` Darrick J. Wong [this message]
2018-10-11 16:05 ` [PATCH v2 " Darrick J. Wong
2018-10-11 4:14 ` [PATCH 18/25] vfs: hide file range comparison function Darrick J. Wong
2018-10-11 4:14 ` [PATCH 19/25] vfs: implement opportunistic short dedupe Darrick J. Wong
2018-10-11 4:14 ` [PATCH 20/25] ocfs2: truncate page cache for clone destination file before remapping Darrick J. Wong
2018-10-11 4:14 ` [PATCH 21/25] ocfs2: fix pagecache truncation prior to reflink Darrick J. Wong
2018-10-11 4:15 ` [PATCH 22/25] ocfs2: support partial clone range and dedupe range Darrick J. Wong
2018-10-11 4:15 ` [PATCH 23/25] xfs: fix pagecache truncation prior to reflink Darrick J. Wong
2018-10-12 1:15 ` Dave Chinner
2018-10-11 4:15 ` [PATCH 24/25] xfs: support returning partial reflink results Darrick J. Wong
2018-10-12 1:22 ` Dave Chinner
2018-10-12 16:06 ` Darrick J. Wong
2018-10-11 4:15 ` [PATCH 25/25] xfs: remove redundant remap partial EOF block checks Darrick J. Wong
2018-10-12 1:22 ` Dave Chinner
2018-10-11 8:33 ` [PATCH v3 00/25] fs: fixes for serious clone/dedupe problems Amir Goldstein
2018-10-11 15:55 ` Darrick J. Wong
2018-10-13 0:05 [PATCH v4 " Darrick J. Wong
2018-10-13 0:07 ` [PATCH 17/25] vfs: enable remap callers that can handle short operations Darrick J. Wong
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