On Tue 29-11-11 21:09:05, Wu Fengguang wrote:
> We may be doing more metadata readahead in future.
>
> Signed-off-by: Wu Fengguang <fengguang.wu@xxxxxxxxx>
Looks OK.
Acked-by: Jan Kara <jack@xxxxxxx>
Honza
> ---
> fs/ext3/dir.c | 1 +
> fs/ext4/dir.c | 1 +
> include/linux/fs.h | 1 +
> mm/readahead.c | 1 +
> 4 files changed, 4 insertions(+)
>
> --- linux-next.orig/fs/ext3/dir.c 2011-11-29 09:48:49.000000000 +0800
> +++ linux-next/fs/ext3/dir.c 2011-11-29 10:13:13.000000000 +0800
> @@ -136,6 +136,7 @@ static int ext3_readdir(struct file * fi
> pgoff_t index = map_bh.b_blocknr >>
> (PAGE_CACHE_SHIFT - inode->i_blkbits);
> if (!ra_has_index(&filp->f_ra, index))
> + filp->f_ra.for_metadata = 1;
> page_cache_sync_readahead(
> sb->s_bdev->bd_inode->i_mapping,
> &filp->f_ra, filp,
> --- linux-next.orig/fs/ext4/dir.c 2011-11-29 09:48:49.000000000 +0800
> +++ linux-next/fs/ext4/dir.c 2011-11-29 10:13:13.000000000 +0800
> @@ -153,6 +153,7 @@ static int ext4_readdir(struct file *fil
> pgoff_t index = map.m_pblk >>
> (PAGE_CACHE_SHIFT - inode->i_blkbits);
> if (!ra_has_index(&filp->f_ra, index))
> + filp->f_ra.for_metadata = 1;
> page_cache_sync_readahead(
> sb->s_bdev->bd_inode->i_mapping,
> &filp->f_ra, filp,
> --- linux-next.orig/include/linux/fs.h 2011-11-29 10:13:08.000000000 +0800
> +++ linux-next/include/linux/fs.h 2011-11-29 10:13:13.000000000 +0800
> @@ -948,6 +948,7 @@ struct file_ra_state {
> u16 mmap_miss; /* Cache miss stat for mmap accesses */
> u8 pattern; /* one of RA_PATTERN_* */
> unsigned int for_mmap:1; /* readahead for mmap accesses */
> + unsigned int for_metadata:1; /* readahead for meta data */
>
> loff_t prev_pos; /* Cache last read() position */
> };
> --- linux-next.orig/mm/readahead.c 2011-11-29 10:13:08.000000000 +0800
> +++ linux-next/mm/readahead.c 2011-11-29 10:13:13.000000000 +0800
> @@ -268,6 +268,7 @@ unsigned long ra_submit(struct file_ra_s
> ra->start, ra->size, ra->async_size);
>
> ra->for_mmap = 0;
> + ra->for_metadata = 0;
> return actual;
> }
>
>
>
> --
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--
Jan Kara <jack@xxxxxxx>
SUSE Labs, CR
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