[PATCH] Btrfs: fix EIO on reading file after ioctl clone works on it

[PATCH] Btrfs: fix EIO on reading file after ioctl clone works on it

[Liu Bo]

For inline data extent, we need to make its length aligned, otherwise,
we can get a phantom extent map which confuses readpages() to return -EIO.

This can be detected by xfstests/btrfs/035.

Reported-by: David Disseldorp <ddiss@suse.de>
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
---
 fs/btrfs/ioctl.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 2ad7de9..2f6d7b1 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -3120,6 +3120,8 @@ process_slot:
 			} else if (type == BTRFS_FILE_EXTENT_INLINE) {
 				u64 skip = 0;
 				u64 trim = 0;
+				u64 aligned_end = 0;
+
 				if (off > key.offset) {
 					skip = off - key.offset;
 					new_key.offset += skip;
@@ -3136,9 +3138,11 @@ process_slot:
 				size -= skip + trim;
 				datal -= skip + trim;
 
+				aligned_end = ALIGN(new_key.offset + datal,
+						    root->sectorsize);
 				ret = btrfs_drop_extents(trans, root, inode,
 							 new_key.offset,
-							 new_key.offset + datal,
+							 aligned_end,
 							 1);
 				if (ret) {
 					if (ret != -EOPNOTSUPP)
-- 
1.8.1.4

Re: [PATCH] Btrfs: fix EIO on reading file after ioctl clone works on it

[Liu Bo]

(cc David)

-liubo

On Fri, May 09, 2014 at 10:01:02AM +0800, Liu Bo wrote:
> For inline data extent, we need to make its length aligned, otherwise,
> we can get a phantom extent map which confuses readpages() to return -EIO.
> 
> This can be detected by xfstests/btrfs/035.
> 
> Reported-by: David Disseldorp <ddiss@suse.de>
> Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
> ---
>  fs/btrfs/ioctl.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
> index 2ad7de9..2f6d7b1 100644
> --- a/fs/btrfs/ioctl.c
> +++ b/fs/btrfs/ioctl.c
> @@ -3120,6 +3120,8 @@ process_slot:
>  			} else if (type == BTRFS_FILE_EXTENT_INLINE) {
>  				u64 skip = 0;
>  				u64 trim = 0;
> +				u64 aligned_end = 0;
> +
>  				if (off > key.offset) {
>  					skip = off - key.offset;
>  					new_key.offset += skip;
> @@ -3136,9 +3138,11 @@ process_slot:
>  				size -= skip + trim;
>  				datal -= skip + trim;
>  
> +				aligned_end = ALIGN(new_key.offset + datal,
> +						    root->sectorsize);
>  				ret = btrfs_drop_extents(trans, root, inode,
>  							 new_key.offset,
> -							 new_key.offset + datal,
> +							 aligned_end,
>  							 1);
>  				if (ret) {
>  					if (ret != -EOPNOTSUPP)
> -- 
> 1.8.1.4
> 
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