2019-07-05 08:05:04

by yangerkun

Subject: [PATCH v2] ext4: fix warning when turn on dioread_nolock and inline_data

mkfs.ext4 -O inline_data /dev/vdb
mount -o dioread_nolock /dev/vdb /mnt
echo "some inline data..." >> /mnt/test-file
echo "some inline data..." >> /mnt/test-file
sync

The above script will trigger "WARN_ON(!io_end->handle && sbi->s_journal)"
because ext4_should_dioread_nolock() returns false for a file with inline
data. Move the check to a place after we have already removed the inline
data and prepared inode to write normal pages.

Reviewed-by: Jan Kara <[email protected]>
Signed-off-by: yangerkun <[email protected]>
---
fs/ext4/inode.c | 18 +++++++++---------
1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index c7f77c6..3f2a366 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -2769,15 +2769,6 @@ static int ext4_writepages(struct address_space *mapping,
goto out_writepages;
}

- if (ext4_should_dioread_nolock(inode)) {
- /*
- * We may need to convert up to one extent per block in
- * the page and we may dirty the inode.
- */
- rsv_blocks = 1 + ext4_chunk_trans_blocks(inode,
- PAGE_SIZE >> inode->i_blkbits);
- }
-
/*
* If we have inline data and arrive here, it means that
* we will soon create the block for the 1st page, so
@@ -2796,6 +2787,15 @@ static int ext4_writepages(struct address_space *mapping,
ext4_journal_stop(handle);
}

+ if (ext4_should_dioread_nolock(inode)) {
+ /*
+ * We may need to convert up to one extent per block in
+ * the page and we may dirty the inode.
+ */
+ rsv_blocks = 1 + ext4_chunk_trans_blocks(inode,
+ PAGE_SIZE >> inode->i_blkbits);
+ }
+
if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
range_whole = 1;

--
2.7.4

2019-07-18 15:07:04

by Theodore Ts'o

Subject: Re: [PATCH v2] ext4: fix warning when turn on dioread_nolock and inline_data

On Fri, Jul 05, 2019 at 04:01:34PM +0800, yangerkun wrote:
> mkfs.ext4 -O inline_data /dev/vdb
> mount -o dioread_nolock /dev/vdb /mnt
> echo "some inline data..." >> /mnt/test-file
> echo "some inline data..." >> /mnt/test-file
> sync
>
> The above script will trigger "WARN_ON(!io_end->handle && sbi->s_journal)"
> because ext4_should_dioread_nolock() returns false for a file with inline
> data. Move the check to a place after we have already removed the inline
> data and prepared inode to write normal pages.
>
> Reviewed-by: Jan Kara <[email protected]>
> Signed-off-by: yangerkun <[email protected]>

Thanks, applied.

- Ted