[PATCH] ext4:Fix a bug in 6d9c85eb.

[PATCH] ext4:Fix a bug in 6d9c85eb.

[Yongqiang Yang]

In case blocksize < pagesize, ext4_ext_fiemap_cb need to ignore
blocks which are not in request range.

BUG description:
xfstests 225 ended in a endless loop without this patch
when blocksize < pagesize.

Reported-by: Amir Goldstein <amir73il@users.sf.net>
Signed-off-by: Yongqiang Yang <xiaoqiangnk@gmail.com>
---
 fs/ext4/extents.c |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index e363f21..ec37109 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -3718,9 +3718,14 @@ out:
 
 			bh = head;
 			do {
+				if (end < newex->ec_block)
+					/* The buffer is not in
+					 * the request range.
+					 */
+					continue;
 				if (buffer_mapped(bh)) {
 					/* get the 1st mapped buffer. */
-					if (end > newex->ec_block +
+					if (end >= newex->ec_block +
 						newex->ec_len)
 						/* The buffer is out of
 						 * the request range.
-- 
1.7.5.1

Re: [PATCH] ext4:Fix a bug in 6d9c85eb.

[Lukas Czerner]

On Tue, 10 May 2011, Yongqiang Yang wrote:

The commit subject is really useless, could you be more specific ? and
possibly more descriptive in commit description ?

Thanks!
-Lukas

> In case blocksize < pagesize, ext4_ext_fiemap_cb need to ignore
> blocks which are not in request range.
> 
> BUG description:
> xfstests 225 ended in a endless loop without this patch
> when blocksize < pagesize.
> 
> Reported-by: Amir Goldstein <amir73il@users.sf.net>
> Signed-off-by: Yongqiang Yang <xiaoqiangnk@gmail.com>
> ---
>  fs/ext4/extents.c |    7 ++++++-
>  1 files changed, 6 insertions(+), 1 deletions(-)
> 
> diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
> index e363f21..ec37109 100644
> --- a/fs/ext4/extents.c
> +++ b/fs/ext4/extents.c
> @@ -3718,9 +3718,14 @@ out:
>  
>  			bh = head;
>  			do {
> +				if (end < newex->ec_block)
> +					/* The buffer is not in
> +					 * the request range.
> +					 */
> +					continue;
>  				if (buffer_mapped(bh)) {
>  					/* get the 1st mapped buffer. */
> -					if (end > newex->ec_block +
> +					if (end >= newex->ec_block +
>  						newex->ec_len)
>  						/* The buffer is out of
>  						 * the request range.
> 

--