Re: Request 5c6863019e45 ("cancel the setfilesize transation when io error happen") for 3.12 stable inclusion

[Jiri Slaby <jslaby@suse.cz>]

On 03/23/2017, 04:19 PM, Nikolay Borisov wrote:
> Hello,
> 
> 
> I'd like to request the above patch be included into the 3.12 stable
> tree. I've attached a backport and have run xfstest and no regressions
> were observed. This fixes hang in generic/361 test.

So this is actually 5cb13dcd0fac071b45c4bebe1801a08ff0d89cad, not
5c6863019e45, right? Applied as the former. Thanks.

> 0001-cancel-the-setfilesize-transation-when-io-error-happ.patch
> 
> 
> From 5c6863019e453bee3ac6dbdf1fbf0d9125942c3b Mon Sep 17 00:00:00 2001
> From: Zhaohongjiang <zhaohongjiang@huawei.com>
> Date: Mon, 12 Oct 2015 15:28:39 +1100
> Subject: [PATCH] cancel the setfilesize transation when io error happen
> 
> 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. ]
> 
> [ nborisov: Adjusted context for 3.12 ]
> 
> Signed-off-by: Zhao Hongjiang <zhaohongjiang@huawei.com>
> Signed-off-by: Dave Chinner <david@fromorbit.com>
> Signed-off-by: Nikolay Borisov <nborisov@suse.com>
> ---
>  fs/xfs/xfs_aops.c | 13 +++++++++++--
>  1 file changed, 11 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c
> index ab28ad576b16..6394e3f51553 100644
> --- a/fs/xfs/xfs_aops.c
> +++ b/fs/xfs/xfs_aops.c
> @@ -150,6 +150,12 @@ 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) {
> @@ -205,14 +211,17 @@ 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)) {
> -- 2.7.4
> 


-- 
js
suse labs