Messages in this thread Patch in this message | | | From | Nigel Cunningham <> | Subject | [Suspend2][ 14/32] [Suspend2] Submit io on a page. | Date | Tue, 27 Jun 2006 08:37:57 +1000 |
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Given a struct io_info, allocate and populate a struct bio for the page, link it to the struct io_info and submit the i/o.
Signed-off-by: Nigel Cunningham <nigel@suspend2.net>
kernel/power/suspend_block_io.c | 51 +++++++++++++++++++++++++++++++++++++++ 1 files changed, 51 insertions(+), 0 deletions(-)
diff --git a/kernel/power/suspend_block_io.c b/kernel/power/suspend_block_io.c index 288718c..4d489f4 100644 --- a/kernel/power/suspend_block_io.c +++ b/kernel/power/suspend_block_io.c @@ -463,3 +463,54 @@ static int suspend_end_bio(struct bio *b return 0; } +/** + * submit - submit BIO request. + * @rw: READ or WRITE. + * @io_info: IO info structure. + * + * Based on Patrick's pmdisk code from long ago: + * "Straight from the textbook - allocate and initialize the bio. + * If we're writing, make sure the page is marked as dirty. + * Then submit it and carry on." + * + * With a twist, though - we handle block_size != PAGE_SIZE. + * Caller has already checked that our page is not fragmented. + */ + +static int submit(int rw, struct io_info *io_info) +{ + int error = 0; + struct bio *bio = NULL; + unsigned long flags; + + while (!bio) { + bio = bio_alloc(GFP_ATOMIC,1); + if (!bio) + do_bio_wait(4); + } + + bio->bi_bdev = io_info->dev; + bio->bi_sector = io_info->block[0]; + bio->bi_private = io_info; + bio->bi_end_io = suspend_end_bio; + io_info->sys_struct = bio; + + if (bio_add_page(bio, io_info->buffer_page, PAGE_SIZE, 0) < PAGE_SIZE) { + printk("ERROR: adding page to bio at %lld\n", + (unsigned long long) io_info->block[0]); + bio_put(bio); + return -EFAULT; + } + + if (rw == WRITE) + bio_set_pages_dirty(bio); + + spin_lock_irqsave(&ioinfo_busy_lock, flags); + list_add_tail(&io_info->list, &ioinfo_busy); + spin_unlock_irqrestore(&ioinfo_busy_lock, flags); + + submit_bio(rw,bio); + + return error; +} + -- Nigel Cunningham nigel at suspend2 dot net - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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