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From: "Darrick J. Wong" <darrick.wong@oracle.com>
To: david@fromorbit.com, darrick.wong@oracle.com
Cc: sandeen@redhat.com, linux-nfs@vger.kernel.org,
	linux-cifs@vger.kernel.org, linux-unionfs@vger.kernel.org,
	linux-xfs@vger.kernel.org, linux-mm@kvack.org,
	linux-btrfs@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	Christoph Hellwig <hch@lst.de>,
	ocfs2-devel@oss.oracle.com
Subject: [PATCH 03/28] vfs: exit early from zero length remap operations
Date: Sun, 21 Oct 2018 09:15:23 -0700	[thread overview]
Message-ID: <154013852390.29026.2594942938207791308.stgit@magnolia> (raw)
In-Reply-To: <154013850285.29026.16168387526580596209.stgit@magnolia>

From: Darrick J. Wong <darrick.wong@oracle.com>

If a remap caller asks us to remap to the source file's EOF and the
source file length leaves us with a zero byte request, exit early.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
 fs/read_write.c |    2 ++
 1 file changed, 2 insertions(+)


diff --git a/fs/read_write.c b/fs/read_write.c
index d6e8e242a15f..2456da3f8a41 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -1748,6 +1748,8 @@ int vfs_clone_file_prep(struct file *file_in, loff_t pos_in,
 		if (pos_in > isize)
 			return -EINVAL;
 		*len = isize - pos_in;
+		if (*len == 0)
+			return 0;
 	}
 
 	/* Check that we don't violate system file offset limits. */

WARNING: multiple messages have this Message-ID
From: Darrick J. Wong <darrick.wong@oracle.com>
To: david@fromorbit.com, darrick.wong@oracle.com
Cc: sandeen@redhat.com, linux-nfs@vger.kernel.org,
	linux-cifs@vger.kernel.org, linux-unionfs@vger.kernel.org,
	linux-xfs@vger.kernel.org, linux-mm@kvack.org,
	linux-btrfs@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	Christoph Hellwig <hch@lst.de>,
	ocfs2-devel@oss.oracle.com
Subject: [Ocfs2-devel] [PATCH 03/28] vfs: exit early from zero length remap operations
Date: Sun, 21 Oct 2018 09:15:23 -0700	[thread overview]
Message-ID: <154013852390.29026.2594942938207791308.stgit@magnolia> (raw)
In-Reply-To: <154013850285.29026.16168387526580596209.stgit@magnolia>

From: Darrick J. Wong <darrick.wong@oracle.com>

If a remap caller asks us to remap to the source file's EOF and the
source file length leaves us with a zero byte request, exit early.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
 fs/read_write.c |    2 ++
 1 file changed, 2 insertions(+)


diff --git a/fs/read_write.c b/fs/read_write.c
index d6e8e242a15f..2456da3f8a41 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -1748,6 +1748,8 @@ int vfs_clone_file_prep(struct file *file_in, loff_t pos_in,
 		if (pos_in > isize)
 			return -EINVAL;
 		*len = isize - pos_in;
+		if (*len == 0)
+			return 0;
 	}
 
 	/* Check that we don't violate system file offset limits. */

  parent reply	other threads:[~2018-10-21 16:15 UTC|newest]

Thread overview: 83+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-10-21 16:15 [Ocfs2-devel] [PATCH v6 00/28] fs: fixes for serious clone/dedupe problems Darrick J. Wong
2018-10-21 16:15 ` [Ocfs2-devel] [PATCH 01/28] vfs: vfs_clone_file_prep_inodes should return EINVAL for a clone from beyond EOF Darrick J. Wong
2018-10-21 16:15 ` [Ocfs2-devel] [PATCH 02/28] vfs: check file ranges before cloning files Darrick J. Wong
2018-10-21 16:15 ` Darrick J. Wong [this message]
2018-10-21 16:15 ` [Ocfs2-devel] [PATCH 04/28] vfs: strengthen checking of file range inputs to generic_remap_checks Darrick J. Wong
2018-10-21 16:15 ` [Ocfs2-devel] [PATCH 05/28] vfs: avoid problematic remapping requests into partial EOF block Darrick J. Wong
2018-10-21 16:15 ` [Ocfs2-devel] [PATCH 06/28] vfs: skip zero-length dedupe requests Darrick J. Wong
2018-10-21 16:15 ` [Ocfs2-devel] [PATCH 07/28] vfs: rename vfs_clone_file_prep to be more descriptive Darrick J. Wong
2018-10-21 16:15 ` [Ocfs2-devel] [PATCH 08/28] vfs: rename clone_verify_area to remap_verify_area Darrick J. Wong
2018-10-21 16:16 ` [Ocfs2-devel] [PATCH 09/28] vfs: combine the clone and dedupe into a single remap_file_range Darrick J. Wong
2018-10-21 16:16 ` [Ocfs2-devel] [PATCH 10/28] vfs: pass remap flags to generic_remap_file_range_prep Darrick J. Wong
2018-10-21 16:16 ` [Ocfs2-devel] [PATCH 11/28] vfs: pass remap flags to generic_remap_checks Darrick J. Wong
2018-10-21 16:16 ` [Ocfs2-devel] [PATCH 12/28] vfs: remap helper should update destination inode metadata Darrick J. Wong
2018-10-21 16:16 ` [Ocfs2-devel] [PATCH 13/28] vfs: make remap_file_range functions take and return bytes completed Darrick J. Wong
2018-10-21 16:16 ` [Ocfs2-devel] [PATCH 14/28] vfs: plumb remap flags through the vfs clone functions Darrick J. Wong
2018-10-21 16:16 ` [Ocfs2-devel] [PATCH 15/28] vfs: plumb remap flags through the vfs dedupe functions Darrick J. Wong
2018-10-21 16:16 ` [Ocfs2-devel] [PATCH 16/28] vfs: enable remap callers that can handle short operations Darrick J. Wong
2018-10-21 16:17 ` [Ocfs2-devel] [PATCH 17/28] vfs: hide file range comparison function Darrick J. Wong
2018-10-21 16:17 ` [Ocfs2-devel] [PATCH 18/28] vfs: clean up generic_remap_file_range_prep return value Darrick J. Wong
2018-10-21 16:17 ` [Ocfs2-devel] [PATCH 19/28] ocfs2: truncate page cache for clone destination file before remapping Darrick J. Wong
2018-10-21 16:17 ` [Ocfs2-devel] [PATCH 20/28] ocfs2: fix pagecache truncation prior to reflink Darrick J. Wong
2018-10-21 16:17 ` [Ocfs2-devel] [PATCH 21/28] ocfs2: support partial clone range and dedupe range Darrick J. Wong
2018-10-21 16:17 ` [Ocfs2-devel] [PATCH 22/28] ocfs2: remove ocfs2_reflink_remap_range Darrick J. Wong
2018-10-21 16:17 ` [Ocfs2-devel] [PATCH 23/28] xfs: fix pagecache truncation prior to reflink Darrick J. Wong
2018-10-21 16:17 ` [Ocfs2-devel] [PATCH 24/28] xfs: clean up xfs_reflink_remap_blocks call site Darrick J. Wong
2018-10-22  2:11   ` Dave Chinner
2018-10-21 16:17 ` [Ocfs2-devel] [PATCH 25/28] xfs: support returning partial reflink results Darrick J. Wong
2018-10-22  2:14   ` Dave Chinner
2018-10-21 16:18 ` [Ocfs2-devel] [PATCH 26/28] xfs: remove redundant remap partial EOF block checks Darrick J. Wong
2018-10-21 16:18 ` [Ocfs2-devel] [PATCH 27/28] xfs: remove xfs_reflink_remap_range Darrick J. Wong
2018-10-22  2:17   ` Dave Chinner
2018-10-21 16:18 ` [Ocfs2-devel] [PATCH 28/28] xfs: remove [cm]time update from reflink calls Darrick J. Wong
2018-10-22  2:18   ` Dave Chinner
2018-10-22  2:21 ` [Ocfs2-devel] [PATCH v6 00/28] fs: fixes for serious clone/dedupe problems Dave Chinner
2018-10-22  4:37   ` Dave Chinner
2018-10-22  4:52     ` Al Viro
2018-10-22  5:08       ` Dave Chinner
2018-10-22  5:42         ` Amir Goldstein
2018-10-22  6:55           ` [Ocfs2-devel] " Dave Chinner

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