Re: [PATCH 04/11] md-bitmap: split file writes into a separate helper

[Himanshu Madhani <himanshu.madhani@oracle.com>]

> On Jun 14, 2023, at 11:48 PM, Christoph Hellwig <hch@lst.de> wrote:
> 
> Split the file write code out of write_page into a separate helper.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
> drivers/md/md-bitmap.c | 48 +++++++++++++++++++++---------------------
> 1 file changed, 24 insertions(+), 24 deletions(-)
> 
> diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c
> index e4b466522d4e74..46fbcfc9d1fcac 100644
> --- a/drivers/md/md-bitmap.c
> +++ b/drivers/md/md-bitmap.c
> @@ -296,33 +296,22 @@ static void write_sb_page(struct bitmap *bitmap, struct page *page, int wait)
> }
> 
> static void md_bitmap_file_kick(struct bitmap *bitmap);
> -/*
> - * write out a page to a file
> - */
> -static void write_page(struct bitmap *bitmap, struct page *page, int wait)
> -{
> - struct buffer_head *bh;
> 
> - if (bitmap->storage.file == NULL) {
> - write_sb_page(bitmap, page, wait);
> - } else {
> -
> - bh = page_buffers(page);
> -
> - while (bh && bh->b_blocknr) {
> - atomic_inc(&bitmap->pending_writes);
> - set_buffer_locked(bh);
> - set_buffer_mapped(bh);
> - submit_bh(REQ_OP_WRITE | REQ_SYNC, bh);
> - bh = bh->b_this_page;
> - }
> +static void write_file_page(struct bitmap *bitmap, struct page *page, int wait)
> +{
> + struct buffer_head *bh = page_buffers(page);
> 
> - if (wait)
> - wait_event(bitmap->write_wait,
> -   atomic_read(&bitmap->pending_writes)==0);
> + while (bh && bh->b_blocknr) {
> + atomic_inc(&bitmap->pending_writes);
> + set_buffer_locked(bh);
> + set_buffer_mapped(bh);
> + submit_bh(REQ_OP_WRITE | REQ_SYNC, bh);
> + bh = bh->b_this_page;
> }
> - if (test_bit(BITMAP_WRITE_ERROR, &bitmap->flags))
> - md_bitmap_file_kick(bitmap);
> +
> + if (wait)
> + wait_event(bitmap->write_wait,
> +   atomic_read(&bitmap->pending_writes) == 0);
> }
> 
> static void end_bitmap_write(struct buffer_head *bh, int uptodate)
> @@ -429,6 +418,17 @@ static int read_page(struct file *file, unsigned long index,
>  * bitmap file superblock operations
>  */
> 
> +/*
> + * write out a page to a file
> + */
> +static void write_page(struct bitmap *bitmap, struct page *page, int wait)
> +{
> + if (bitmap->storage.file)
> + write_file_page(bitmap, page, wait);
> + else
> + write_sb_page(bitmap, page, wait);
> +}
> +
> /*
>  * md_bitmap_wait_writes() should be called before writing any bitmap
>  * blocks, to ensure previous writes, particularly from
> -- 
> 2.39.2
> 

Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>

-- 
Himanshu Madhani Oracle Linux Engineering