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Move block I/O operations to a separate file. It is because it will be used later not only by the swap writer. Signed-off-by: Jiri Slaby <jslaby@suse.cz> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
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Jiri Slaby
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Rafael J. Wysocki
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May 10, 2010
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,103 @@ | ||
| /* | ||
| * 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 | (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_UNPLUG); | ||
| struct bio *bio; | ||
|
|
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| 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 %ld\n", | ||
| sector); | ||
| bio_put(bio); | ||
| return -EFAULT; | ||
| } | ||
|
|
||
| lock_page(page); | ||
| bio_get(bio); | ||
|
|
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| 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); | ||
| } | ||
|
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| 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; | ||
| } |
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