Hi Ted, Christoph
Will you please provide your feedback for these patch set,
[PATCH v2 1/2] block: add BH_Meta flag
[PATCH v2 2/2] ext4: annotate all meta data requests
If there is no comment then will you please merge them.
Regards
Saugata
On 17 May 2012 17:51, Saugata Das <saugata.das@xxxxxxxxxxxxxx> wrote:
> From: Saugata Das <saugata.das@xxxxxxxxxx>
>
> Today, storage devices like eMMC has special features like data tagging
> (introduced in MMC-4.5 version) in order to improve performance of some
> specific writes. On MMC stack, data tagging is used for all writes which
> has REQ_META flag set. This patch adds the capability to add REQ_META flag
> during meta data write.
>
> Signed-off-by: Saugata Das <saugata.das@xxxxxxxxxx>
>
> changes in v2:
> Replaced the conditionals around submit_bh as suggested in the review
> comments from Boaz
> ---
> fs/buffer.c | 6 ++++--
> include/linux/buffer_head.h | 2 ++
> 2 files changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/fs/buffer.c b/fs/buffer.c
> index 36d6665..942c75b 100644
> --- a/fs/buffer.c
> +++ b/fs/buffer.c
> @@ -1685,7 +1685,8 @@ static int __block_write_full_page(struct inode *inode, struct page *page,
> do {
> struct buffer_head *next = bh->b_this_page;
> if (buffer_async_write(bh)) {
> - submit_bh(write_op, bh);
> + submit_bh(write_op |
> + (buffer_meta(bh) << __REQ_META), bh);
> nr_underway++;
> }
> bh = next;
> @@ -1739,7 +1740,8 @@ recover:
> struct buffer_head *next = bh->b_this_page;
> if (buffer_async_write(bh)) {
> clear_buffer_dirty(bh);
> - submit_bh(write_op, bh);
> + submit_bh(write_op |
> + (buffer_meta(bh) << __REQ_META), bh);
> nr_underway++;
> }
> bh = next;
> diff --git a/include/linux/buffer_head.h b/include/linux/buffer_head.h
> index 458f497..13bba17 100644
> --- a/include/linux/buffer_head.h
> +++ b/include/linux/buffer_head.h
> @@ -34,6 +34,7 @@ enum bh_state_bits {
> BH_Write_EIO, /* I/O error on write */
> BH_Unwritten, /* Buffer is allocated on disk but not written */
> BH_Quiet, /* Buffer Error Prinks to be quiet */
> + BH_Meta, /* Is meta */
>
> BH_PrivateStart,/* not a state bit, but the first bit available
> * for private allocation by other entities
> @@ -124,6 +125,7 @@ BUFFER_FNS(Delay, delay)
> BUFFER_FNS(Boundary, boundary)
> BUFFER_FNS(Write_EIO, write_io_error)
> BUFFER_FNS(Unwritten, unwritten)
> +BUFFER_FNS(Meta, meta)
>
> #define bh_offset(bh) ((unsigned long)(bh)->b_data & ~PAGE_MASK)
> #define touch_buffer(bh) mark_page_accessed(bh->b_page)
> --
> 1.7.4.3
>
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