linux-kernel - [PATCH 3.18 063/145] cancel the setfilesize transation when io error happen

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Date:   Sun, 16 Apr 2017 12:49:16 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Zhao Hongjiang <zhaohongjiang@...wei.com>,
        Dave Chinner <david@...morbit.com>,
        Nikolay Borisov <nborisov@...e.com>
Subject: [PATCH 3.18 063/145] cancel the setfilesize transation when io error happen

3.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Zhaohongjiang <zhaohongjiang@...wei.com>

commit 5cb13dcd0fac071b45c4bebe1801a08ff0d89cad upstream.

When I ran xfstest/073 case, the remount process was blocked to wait
transactions to be zero. I found there was a io error happened, and
the setfilesize transaction was not released properly. We should add
the changes to cancel the io error in this case.

Reproduction steps:
1. dd if=/dev/zero of=xfs1.img bs=1M count=2048
2. mkfs.xfs xfs1.img
3. losetup -f ./xfs1.img /dev/loop0
4. mount -t xfs /dev/loop0 /home/test_dir/
5. mkdir /home/test_dir/test
6. mkfs.xfs -dfile,name=image,size=2g
7. mount -t xfs -o loop image /home/test_dir/test
8. cp a file bigger than 2g to /home/test_dir/test
9. mount -t xfs -o remount,ro /home/test_dir/test

[ dchinner: moved io error detection to xfs_setfilesize_ioend() after
  transaction context restoration. ]

Signed-off-by: Zhao Hongjiang <zhaohongjiang@...wei.com>
Signed-off-by: Dave Chinner <david@...morbit.com>
Signed-off-by: Nikolay Borisov <nborisov@...e.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 fs/xfs/xfs_aops.c |   13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

--- a/fs/xfs/xfs_aops.c
+++ b/fs/xfs/xfs_aops.c
@@ -153,6 +153,12 @@ xfs_setfilesize(
 	rwsem_acquire_read(&VFS_I(ip)->i_sb->s_writers.lock_map[SB_FREEZE_FS-1],
 			   0, 1, _THIS_IP_);
 
+	/* we abort the update if there was an IO error */
+	if (ioend->io_error) {
+		xfs_trans_cancel(tp, 0);
+		return ioend->io_error;
+	}
+
 	xfs_ilock(ip, XFS_ILOCK_EXCL);
 	isize = xfs_new_eof(ip, ioend->io_offset + ioend->io_size);
 	if (!isize) {
@@ -208,14 +214,17 @@ xfs_end_io(
 		ioend->io_error = -EIO;
 		goto done;
 	}
-	if (ioend->io_error)
-		goto done;
 
 	/*
 	 * For unwritten extents we need to issue transactions to convert a
 	 * range to normal written extens after the data I/O has finished.
+	 * Detecting and handling completion IO errors is done individually
+	 * for each case as different cleanup operations need to be performed
+	 * on error.
 	 */
 	if (ioend->io_type == XFS_IO_UNWRITTEN) {
+		if (ioend->io_error)
+			goto done;
 		error = xfs_iomap_write_unwritten(ip, ioend->io_offset,
 						  ioend->io_size);
 	} else if (ioend->io_isdirect && xfs_ioend_is_append(ioend)) {