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    Subject[Suspend2][ 06/35] [Suspend2] Filewriter populate block list.
    Date
    Populate the extent chain that contains the list of sectors we'll use for
    writing the image.

    Signed-off-by: Nigel Cunningham <nigel@suspend2.net>

    kernel/power/suspend_file.c | 67 +++++++++++++++++++++++++++++++++++++++++++
    1 files changed, 67 insertions(+), 0 deletions(-)

    diff --git a/kernel/power/suspend_file.c b/kernel/power/suspend_file.c
    index 9046b80..97f97be 100644
    --- a/kernel/power/suspend_file.c
    +++ b/kernel/power/suspend_file.c
    @@ -168,3 +168,70 @@ static int size_ignoring_ignored_pages(v
    return filewriter_storage_available();
    }

    +static void __populate_block_list(int min, int max)
    +{
    + if (test_action_state(SUSPEND_TEST_BIO))
    + printk("Adding extent %d-%d.\n", min << devinfo.bmap_shift,
    + ((max + 1) << devinfo.bmap_shift) - 1);
    +
    + suspend_add_to_extent_chain(&block_chain, min, max);
    +}
    +
    +static void populate_block_list(void)
    +{
    + int i;
    +
    + if (block_chain.first)
    + suspend_put_extent_chain(&block_chain);
    +
    + if (target_is_normal_file()) {
    + int extent_min = -1, extent_max = -1, got_header = 0;
    +
    + for (i = 0;
    + i < (target_inode->i_size >> PAGE_SHIFT);
    + i++) {
    + sector_t new_sector;
    +
    + if (!has_contiguous_blocks(i))
    + continue;
    +
    + new_sector = bmap(target_inode,
    + (i * devinfo.blocks_per_page));
    +
    + /*
    + * Ignore the first block in the file.
    + * It gets the header.
    + */
    + if (new_sector == target_firstblock >> devinfo.bmap_shift) {
    + got_header = 1;
    + continue;
    + }
    +
    + /*
    + * I'd love to be able to fill in holes and resize
    + * files, but not yet...
    + */
    +
    + if (new_sector == extent_max + 1)
    + extent_max+= devinfo.blocks_per_page;
    + else {
    + if (extent_min > -1)
    + __populate_block_list(extent_min,
    + extent_max);
    +
    + extent_min = new_sector;
    + extent_max = extent_min +
    + devinfo.blocks_per_page - 1;
    + }
    + }
    + if (extent_min > -1)
    + __populate_block_list(extent_min, extent_max);
    +
    + BUG_ON(!got_header);
    + } else
    + if (target_storage_available > 0)
    + __populate_block_list(devinfo.blocks_per_page,
    + (min(main_pages, target_storage_available) + 1) *
    + devinfo.blocks_per_page - 1);
    +}
    +
    --
    Nigel Cunningham nigel at suspend2 dot net
    -
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