mirror of
https://github.com/torvalds/linux.git
synced 2025-11-04 02:30:34 +02:00
7b6d91daee
Remove the current bio flags and reuse the request flags for the bio, too. This allows to more easily trace the type of I/O from the filesystem down to the block driver. There were two flags in the bio that were missing in the requests: BIO_RW_UNPLUG and BIO_RW_AHEAD. Also I've renamed two request flags that had a superflous RW in them. Note that the flags are in bio.h despite having the REQ_ name - as blkdev.h includes bio.h that is the only way to go for now. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
103 lines
2.4 KiB
C
103 lines
2.4 KiB
C
/*
|
|
* This file provides functions for block I/O operations on swap/file.
|
|
*
|
|
* Copyright (C) 1998,2001-2005 Pavel Machek <pavel@ucw.cz>
|
|
* Copyright (C) 2006 Rafael J. Wysocki <rjw@sisk.pl>
|
|
*
|
|
* This file is released under the GPLv2.
|
|
*/
|
|
|
|
#include <linux/bio.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/pagemap.h>
|
|
#include <linux/swap.h>
|
|
|
|
#include "power.h"
|
|
|
|
/**
|
|
* submit - submit BIO request.
|
|
* @rw: READ or WRITE.
|
|
* @off physical offset of page.
|
|
* @page: page we're reading or writing.
|
|
* @bio_chain: list of pending biod (for async reading)
|
|
*
|
|
* Straight from the textbook - allocate and initialize the bio.
|
|
* If we're reading, make sure the page is marked as dirty.
|
|
* Then submit it and, if @bio_chain == NULL, wait.
|
|
*/
|
|
static int submit(int rw, struct block_device *bdev, sector_t sector,
|
|
struct page *page, struct bio **bio_chain)
|
|
{
|
|
const int bio_rw = rw | REQ_SYNC | REQ_UNPLUG;
|
|
struct bio *bio;
|
|
|
|
bio = bio_alloc(__GFP_WAIT | __GFP_HIGH, 1);
|
|
bio->bi_sector = sector;
|
|
bio->bi_bdev = bdev;
|
|
bio->bi_end_io = end_swap_bio_read;
|
|
|
|
if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE) {
|
|
printk(KERN_ERR "PM: Adding page to bio failed at %llu\n",
|
|
(unsigned long long)sector);
|
|
bio_put(bio);
|
|
return -EFAULT;
|
|
}
|
|
|
|
lock_page(page);
|
|
bio_get(bio);
|
|
|
|
if (bio_chain == NULL) {
|
|
submit_bio(bio_rw, bio);
|
|
wait_on_page_locked(page);
|
|
if (rw == READ)
|
|
bio_set_pages_dirty(bio);
|
|
bio_put(bio);
|
|
} else {
|
|
if (rw == READ)
|
|
get_page(page); /* These pages are freed later */
|
|
bio->bi_private = *bio_chain;
|
|
*bio_chain = bio;
|
|
submit_bio(bio_rw, bio);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int hib_bio_read_page(pgoff_t page_off, void *addr, struct bio **bio_chain)
|
|
{
|
|
return submit(READ, hib_resume_bdev, page_off * (PAGE_SIZE >> 9),
|
|
virt_to_page(addr), bio_chain);
|
|
}
|
|
|
|
int hib_bio_write_page(pgoff_t page_off, void *addr, struct bio **bio_chain)
|
|
{
|
|
return submit(WRITE, hib_resume_bdev, page_off * (PAGE_SIZE >> 9),
|
|
virt_to_page(addr), bio_chain);
|
|
}
|
|
|
|
int hib_wait_on_bio_chain(struct bio **bio_chain)
|
|
{
|
|
struct bio *bio;
|
|
struct bio *next_bio;
|
|
int ret = 0;
|
|
|
|
if (bio_chain == NULL)
|
|
return 0;
|
|
|
|
bio = *bio_chain;
|
|
if (bio == NULL)
|
|
return 0;
|
|
while (bio) {
|
|
struct page *page;
|
|
|
|
next_bio = bio->bi_private;
|
|
page = bio->bi_io_vec[0].bv_page;
|
|
wait_on_page_locked(page);
|
|
if (!PageUptodate(page) || PageError(page))
|
|
ret = -EIO;
|
|
put_page(page);
|
|
bio_put(bio);
|
|
bio = next_bio;
|
|
}
|
|
*bio_chain = NULL;
|
|
return ret;
|
|
}
|