[3/3] ext4: mark metadata blocks using bh flags

This allows metadata writebacks which are issued via block device
writeback to be sent with the current write request flags.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
---
 fs/ext4/ext4_jbd2.c | 2 ++
 fs/ext4/inode.c     | 6 +++++-
 2 files changed, 7 insertions(+), 1 deletion(-)

On 04/21/2013 02:07 AM, Theodore Ts'o wrote:
> This allows metadata writebacks which are issued via block device
> writeback to be sent with the current write request flags.

Hi, where do these come from?
fs/ext4/ext4_jbd2.c: In function ‘__ext4_handle_dirty_metadata’:
fs/ext4/ext4_jbd2.c:218:2: error: implicit declaration of function
‘mark_buffer_meta’ [-Werror=implicit-function-declaration]
fs/ext4/ext4_jbd2.c:219:2: error: implicit declaration of function
‘mark_buffer_prio’ [-Werror=implicit-function-declaration]
cc1: some warnings being treated as errors

> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
> ---
>  fs/ext4/ext4_jbd2.c | 2 ++
>  fs/ext4/inode.c     | 6 +++++-
>  2 files changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/ext4/ext4_jbd2.c b/fs/ext4/ext4_jbd2.c
> index 0e1dc9e..fd97b81 100644
> --- a/fs/ext4/ext4_jbd2.c
> +++ b/fs/ext4/ext4_jbd2.c
> @@ -215,6 +215,8 @@ int __ext4_handle_dirty_metadata(const char *where, unsigned int line,
>  
>  	might_sleep();
>  
> +	mark_buffer_meta(bh);
> +	mark_buffer_prio(bh);
>  	if (ext4_handle_valid(handle)) {
>  		err = jbd2_journal_dirty_metadata(handle, bh);
>  		if (err) {
> diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
> index 62492e9..d7518e2 100644
> --- a/fs/ext4/inode.c
> +++ b/fs/ext4/inode.c
> @@ -1080,10 +1080,14 @@ retry_journal:
>  /* For write_end() in data=journal mode */
>  static int write_end_fn(handle_t *handle, struct buffer_head *bh)
>  {
> +	int ret;
>  	if (!buffer_mapped(bh) || buffer_freed(bh))
>  		return 0;
>  	set_buffer_uptodate(bh);
> -	return ext4_handle_dirty_metadata(handle, NULL, bh);
> +	ret = ext4_handle_dirty_metadata(handle, NULL, bh);
> +	clear_buffer_meta(bh);
> +	clear_buffer_prio(bh);
> +	return ret;
>  }
>  
>  /*
>

On Sun, Apr 21, 2013 at 08:09:14AM +0200, Jiri Slaby wrote:
> On 04/21/2013 02:07 AM, Theodore Ts'o wrote:
> > This allows metadata writebacks which are issued via block device
> > writeback to be sent with the current write request flags.
> 
> Hi, where do these come from?
> fs/ext4/ext4_jbd2.c: In function ‘__ext4_handle_dirty_metadata’:
> fs/ext4/ext4_jbd2.c:218:2: error: implicit declaration of function
> ‘mark_buffer_meta’ [-Werror=implicit-function-declaration]
> fs/ext4/ext4_jbd2.c:219:2: error: implicit declaration of function
> ‘mark_buffer_prio’ [-Werror=implicit-function-declaration]
> cc1: some warnings being treated as errors

They are defined by "[PATCH 2/3] buffer: add BH_Prio and BH_Meta flags" here:

+BUFFER_FNS(Meta, meta)
+BUFFER_FNS(Prio, prio)

When you tried applying this patch, did you try applying all three
patches in the patch series?

						- Ted
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