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    Subject[PATCH 04/11] readahead: introduce {MAX|MIN}_READAHEAD_PAGES macros for ease of use
    Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
    ---
    block/blk-core.c | 3 +--
    fs/fuse/inode.c | 2 +-
    include/linux/mm.h | 3 +++
    mm/backing-dev.c | 2 +-
    4 files changed, 6 insertions(+), 4 deletions(-)

    --- linux.orig/block/blk-core.c 2010-01-30 17:38:48.000000000 +0800
    +++ linux/block/blk-core.c 2010-01-30 18:10:01.000000000 +0800
    @@ -498,8 +498,7 @@ struct request_queue *blk_alloc_queue_no

    q->backing_dev_info.unplug_io_fn = blk_backing_dev_unplug;
    q->backing_dev_info.unplug_io_data = q;
    - q->backing_dev_info.ra_pages =
    - (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE;
    + q->backing_dev_info.ra_pages = MAX_READAHEAD_PAGES;
    q->backing_dev_info.state = 0;
    q->backing_dev_info.capabilities = BDI_CAP_MAP_COPY;
    q->backing_dev_info.name = "block";
    --- linux.orig/fs/fuse/inode.c 2010-01-30 17:38:48.000000000 +0800
    +++ linux/fs/fuse/inode.c 2010-01-30 18:10:01.000000000 +0800
    @@ -870,7 +870,7 @@ static int fuse_bdi_init(struct fuse_con
    int err;

    fc->bdi.name = "fuse";
    - fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE;
    + fc->bdi.ra_pages = MAX_READAHEAD_PAGES;
    fc->bdi.unplug_io_fn = default_unplug_io_fn;
    /* fuse does it's own writeback accounting */
    fc->bdi.capabilities = BDI_CAP_NO_ACCT_WB;
    --- linux.orig/include/linux/mm.h 2010-01-30 18:09:58.000000000 +0800
    +++ linux/include/linux/mm.h 2010-01-30 18:10:01.000000000 +0800
    @@ -1187,6 +1187,9 @@ void task_dirty_inc(struct task_struct *
    #define VM_MAX_READAHEAD 512 /* kbytes */
    #define VM_MIN_READAHEAD 32 /* kbytes (includes current page) */

    +#define MAX_READAHEAD_PAGES (VM_MAX_READAHEAD*1024 / PAGE_CACHE_SIZE)
    +#define MIN_READAHEAD_PAGES DIV_ROUND_UP(VM_MIN_READAHEAD*1024, PAGE_CACHE_SIZE)
    +
    int force_page_cache_readahead(struct address_space *mapping, struct file *filp,
    pgoff_t offset, unsigned long nr_to_read);

    --- linux.orig/mm/backing-dev.c 2010-01-30 17:38:48.000000000 +0800
    +++ linux/mm/backing-dev.c 2010-01-30 18:10:01.000000000 +0800
    @@ -18,7 +18,7 @@ EXPORT_SYMBOL(default_unplug_io_fn);

    struct backing_dev_info default_backing_dev_info = {
    .name = "default",
    - .ra_pages = VM_MAX_READAHEAD * 1024 / PAGE_CACHE_SIZE,
    + .ra_pages = MAX_READAHEAD_PAGES,
    .state = 0,
    .capabilities = BDI_CAP_MAP_COPY,
    .unplug_io_fn = default_unplug_io_fn,



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