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    Subject[PATCH 4/9] readahead: tag metadata call sites
    We may be doing more metadata readahead in future.

    Acked-by: Jan Kara <jack@suse.cz>
    Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
    ---
    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 2012-01-25 15:57:46.000000000 +0800
    +++ linux-next/fs/ext3/dir.c 2012-01-25 15:57:52.000000000 +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 2012-01-25 15:57:46.000000000 +0800
    +++ linux-next/fs/ext4/dir.c 2012-01-25 15:57:52.000000000 +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 2012-01-25 15:57:51.000000000 +0800
    +++ linux-next/include/linux/fs.h 2012-01-25 15:57:52.000000000 +0800
    @@ -955,6 +955,7 @@ 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 2012-01-25 15:57:51.000000000 +0800
    +++ linux-next/mm/readahead.c 2012-01-25 15:57:52.000000000 +0800
    @@ -260,6 +260,7 @@ 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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