[3/5] ext4: add warning to ext4_convert_unwritten_extents_endio

Submitted by Dmitri Monakho on Feb. 25, 2013, 4:07 p.m.

Details

Message ID 1361808463-25471-3-git-send-email-dmonakhov@openvz.org
State Accepted, archived
Headers show

Commit Message

Dmitri Monakho Feb. 25, 2013, 4:07 p.m.
Splitting extents inside endio is bad thing, but unfortunetly it is still
possible. In fact we are pretty close to the moment when all related
issues will be fixed. Let's warn developer if it still the case.

Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
---
 fs/ext4/extents.c |   13 ++++++++++++-
 1 files changed, 12 insertions(+), 1 deletions(-)

Comments

Jan Kara Feb. 25, 2013, 6:08 p.m.
On Mon 25-02-13 20:07:41, Dmitry Monakhov wrote:
> Splitting extents inside endio is bad thing, but unfortunetly it is still
> possible. In fact we are pretty close to the moment when all related
> issues will be fixed. Let's warn developer if it still the case.
> 
> Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
  Looks good. You can add:
Reviewed-by: Jan Kara <jack@suse.cz>

								Honza

> ---
>  fs/ext4/extents.c |   13 ++++++++++++-
>  1 files changed, 12 insertions(+), 1 deletions(-)
> 
> diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
> index 1d37f2d..78c2a91 100644
> --- a/fs/ext4/extents.c
> +++ b/fs/ext4/extents.c
> @@ -3386,8 +3386,19 @@ static int ext4_convert_unwritten_extents_endio(handle_t *handle,
>  		"block %llu, max_blocks %u\n", inode->i_ino,
>  		  (unsigned long long)ee_block, ee_len);
>  
> -	/* If extent is larger than requested then split is required */
> +	/* If extent is larger than requested it is a clear sign that we still
> +	 * have some extent state machine issues left. So extent_split is still
> +	 * required.
> +	 * TODO: Once all related issues will be fixed this situation should be
> +	 * illegal.
> +	 */
>  	if (ee_block != map->m_lblk || ee_len > map->m_len) {
> +#ifdef EXT4_DEBUG
> +		ext4_warning("Inode (%ld) finished: extent logical block %llu,"
> +			     " len %u; IO logical block %llu, len %u\n",
> +			     inode->i_ino, (unsigned long long)ee_block, ee_len,
> +			     (unsigned long long)map->m_lblk, map->m_len);
> +#endif
>  		err = ext4_split_unwritten_extents(handle, inode, map, path,
>  						   EXT4_GET_BLOCKS_CONVERT);
>  		if (err < 0)
> -- 
> 1.7.1
>

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diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 1d37f2d..78c2a91 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -3386,8 +3386,19 @@  static int ext4_convert_unwritten_extents_endio(handle_t *handle,
 		"block %llu, max_blocks %u\n", inode->i_ino,
 		  (unsigned long long)ee_block, ee_len);
 
-	/* If extent is larger than requested then split is required */
+	/* If extent is larger than requested it is a clear sign that we still
+	 * have some extent state machine issues left. So extent_split is still
+	 * required.
+	 * TODO: Once all related issues will be fixed this situation should be
+	 * illegal.
+	 */
 	if (ee_block != map->m_lblk || ee_len > map->m_len) {
+#ifdef EXT4_DEBUG
+		ext4_warning("Inode (%ld) finished: extent logical block %llu,"
+			     " len %u; IO logical block %llu, len %u\n",
+			     inode->i_ino, (unsigned long long)ee_block, ee_len,
+			     (unsigned long long)map->m_lblk, map->m_len);
+#endif
 		err = ext4_split_unwritten_extents(handle, inode, map, path,
 						   EXT4_GET_BLOCKS_CONVERT);
 		if (err < 0)