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PM / Hibernate: Separate block_io
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>
This commit is contained in:
Jiri Slaby
Rafael J. Wysocki
parent
d3c1b24c50
commit
8a0d613fa1
@ -8,7 +8,8 @@ obj-$(CONFIG_PM_SLEEP) += console.o
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obj-$(CONFIG_FREEZER) += process.o
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obj-$(CONFIG_SUSPEND) += suspend.o
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obj-$(CONFIG_PM_TEST_SUSPEND) += suspend_test.o
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obj-$(CONFIG_HIBERNATION) += hibernate.o snapshot.o swap.o user.o
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obj-$(CONFIG_HIBERNATION) += hibernate.o snapshot.o swap.o user.o \
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block_io.o
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obj-$(CONFIG_HIBERNATION_NVS) += hibernate_nvs.o
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obj-$(CONFIG_MAGIC_SYSRQ) += poweroff.o
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103
kernel/power/block_io.c
Normal file
103
kernel/power/block_io.c
Normal file
@ -0,0 +1,103 @@
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/*
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* This file provides functions for block I/O operations on swap/file.
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*
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* Copyright (C) 1998,2001-2005 Pavel Machek <pavel@ucw.cz>
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* Copyright (C) 2006 Rafael J. Wysocki <rjw@sisk.pl>
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*
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* This file is released under the GPLv2.
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*/
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#include <linux/bio.h>
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#include <linux/kernel.h>
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#include <linux/pagemap.h>
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#include <linux/swap.h>
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#include "power.h"
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/**
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* submit - submit BIO request.
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* @rw: READ or WRITE.
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* @off physical offset of page.
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* @page: page we're reading or writing.
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* @bio_chain: list of pending biod (for async reading)
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*
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* Straight from the textbook - allocate and initialize the bio.
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* If we're reading, make sure the page is marked as dirty.
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* Then submit it and, if @bio_chain == NULL, wait.
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*/
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static int submit(int rw, struct block_device *bdev, sector_t sector,
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struct page *page, struct bio **bio_chain)
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{
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const int bio_rw = rw | (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_UNPLUG);
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struct bio *bio;
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bio = bio_alloc(__GFP_WAIT | __GFP_HIGH, 1);
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bio->bi_sector = sector;
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bio->bi_bdev = bdev;
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bio->bi_end_io = end_swap_bio_read;
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if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE) {
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printk(KERN_ERR "PM: Adding page to bio failed at %ld\n",
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sector);
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bio_put(bio);
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return -EFAULT;
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}
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lock_page(page);
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bio_get(bio);
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if (bio_chain == NULL) {
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submit_bio(bio_rw, bio);
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wait_on_page_locked(page);
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if (rw == READ)
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bio_set_pages_dirty(bio);
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bio_put(bio);
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} else {
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if (rw == READ)
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get_page(page); /* These pages are freed later */
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bio->bi_private = *bio_chain;
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*bio_chain = bio;
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submit_bio(bio_rw, bio);
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}
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return 0;
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}
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int hib_bio_read_page(pgoff_t page_off, void *addr, struct bio **bio_chain)
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{
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return submit(READ, hib_resume_bdev, page_off * (PAGE_SIZE >> 9),
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virt_to_page(addr), bio_chain);
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}
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int hib_bio_write_page(pgoff_t page_off, void *addr, struct bio **bio_chain)
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{
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return submit(WRITE, hib_resume_bdev, page_off * (PAGE_SIZE >> 9),
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virt_to_page(addr), bio_chain);
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}
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int hib_wait_on_bio_chain(struct bio **bio_chain)
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{
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struct bio *bio;
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struct bio *next_bio;
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int ret = 0;
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if (bio_chain == NULL)
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return 0;
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bio = *bio_chain;
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if (bio == NULL)
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return 0;
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while (bio) {
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struct page *page;
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next_bio = bio->bi_private;
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page = bio->bi_io_vec[0].bv_page;
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wait_on_page_locked(page);
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if (!PageUptodate(page) || PageError(page))
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ret = -EIO;
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put_page(page);
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bio_put(bio);
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bio = next_bio;
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}
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*bio_chain = NULL;
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return ret;
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}
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@ -142,6 +142,15 @@ extern int swsusp_read(unsigned int *flags_p);
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extern int swsusp_write(unsigned int flags);
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extern void swsusp_close(fmode_t);
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/* kernel/power/block_io.c */
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extern struct block_device *hib_resume_bdev;
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extern int hib_bio_read_page(pgoff_t page_off, void *addr,
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struct bio **bio_chain);
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extern int hib_bio_write_page(pgoff_t page_off, void *addr,
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struct bio **bio_chain);
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extern int hib_wait_on_bio_chain(struct bio **bio_chain);
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struct timeval;
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/* kernel/power/swsusp.c */
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extern void swsusp_show_speed(struct timeval *, struct timeval *,
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@ -145,93 +145,7 @@ int swsusp_swap_in_use(void)
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*/
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static unsigned short root_swap = 0xffff;
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static struct block_device *resume_bdev;
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/**
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* submit - submit BIO request.
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* @rw: READ or WRITE.
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* @off physical offset of page.
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* @page: page we're reading or writing.
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* @bio_chain: list of pending biod (for async reading)
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*
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* Straight from the textbook - allocate and initialize the bio.
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* If we're reading, make sure the page is marked as dirty.
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* Then submit it and, if @bio_chain == NULL, wait.
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*/
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static int submit(int rw, pgoff_t page_off, struct page *page,
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struct bio **bio_chain)
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{
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const int bio_rw = rw | (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_UNPLUG);
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struct bio *bio;
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bio = bio_alloc(__GFP_WAIT | __GFP_HIGH, 1);
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bio->bi_sector = page_off * (PAGE_SIZE >> 9);
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bio->bi_bdev = resume_bdev;
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bio->bi_end_io = end_swap_bio_read;
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if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE) {
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printk(KERN_ERR "PM: Adding page to bio failed at %ld\n",
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page_off);
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bio_put(bio);
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return -EFAULT;
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}
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lock_page(page);
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bio_get(bio);
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if (bio_chain == NULL) {
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submit_bio(bio_rw, bio);
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wait_on_page_locked(page);
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if (rw == READ)
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bio_set_pages_dirty(bio);
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bio_put(bio);
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} else {
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if (rw == READ)
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get_page(page); /* These pages are freed later */
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bio->bi_private = *bio_chain;
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*bio_chain = bio;
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submit_bio(bio_rw, bio);
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}
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return 0;
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}
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static int bio_read_page(pgoff_t page_off, void *addr, struct bio **bio_chain)
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{
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return submit(READ, page_off, virt_to_page(addr), bio_chain);
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}
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static int bio_write_page(pgoff_t page_off, void *addr, struct bio **bio_chain)
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{
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return submit(WRITE, page_off, virt_to_page(addr), bio_chain);
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}
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static int wait_on_bio_chain(struct bio **bio_chain)
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{
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struct bio *bio;
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struct bio *next_bio;
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int ret = 0;
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if (bio_chain == NULL)
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return 0;
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bio = *bio_chain;
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if (bio == NULL)
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return 0;
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while (bio) {
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struct page *page;
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next_bio = bio->bi_private;
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page = bio->bi_io_vec[0].bv_page;
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wait_on_page_locked(page);
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if (!PageUptodate(page) || PageError(page))
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ret = -EIO;
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put_page(page);
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bio_put(bio);
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bio = next_bio;
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}
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*bio_chain = NULL;
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return ret;
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}
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struct block_device *hib_resume_bdev;
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/*
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* Saving part
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@ -241,14 +155,14 @@ static int mark_swapfiles(sector_t start, unsigned int flags)
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{
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int error;
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bio_read_page(swsusp_resume_block, swsusp_header, NULL);
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hib_bio_read_page(swsusp_resume_block, swsusp_header, NULL);
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if (!memcmp("SWAP-SPACE",swsusp_header->sig, 10) ||
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!memcmp("SWAPSPACE2",swsusp_header->sig, 10)) {
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memcpy(swsusp_header->orig_sig,swsusp_header->sig, 10);
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memcpy(swsusp_header->sig,SWSUSP_SIG, 10);
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swsusp_header->image = start;
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swsusp_header->flags = flags;
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error = bio_write_page(swsusp_resume_block,
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error = hib_bio_write_page(swsusp_resume_block,
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swsusp_header, NULL);
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} else {
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printk(KERN_ERR "PM: Swap header not found!\n");
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@ -267,18 +181,18 @@ static int swsusp_swap_check(void) /* This is called before saving image */
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int res;
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res = swap_type_of(swsusp_resume_device, swsusp_resume_block,
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&resume_bdev);
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&hib_resume_bdev);
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if (res < 0)
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return res;
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root_swap = res;
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res = blkdev_get(resume_bdev, FMODE_WRITE);
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res = blkdev_get(hib_resume_bdev, FMODE_WRITE);
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if (res)
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return res;
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res = set_blocksize(resume_bdev, PAGE_SIZE);
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res = set_blocksize(hib_resume_bdev, PAGE_SIZE);
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if (res < 0)
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blkdev_put(resume_bdev, FMODE_WRITE);
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blkdev_put(hib_resume_bdev, FMODE_WRITE);
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return res;
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}
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@ -309,7 +223,7 @@ static int write_page(void *buf, sector_t offset, struct bio **bio_chain)
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} else {
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src = buf;
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}
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return bio_write_page(offset, src, bio_chain);
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return hib_bio_write_page(offset, src, bio_chain);
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}
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/*
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@ -380,7 +294,7 @@ static int swap_write_page(struct swap_map_handle *handle, void *buf,
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return error;
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handle->cur->entries[handle->k++] = offset;
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if (handle->k >= MAP_PAGE_ENTRIES) {
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error = wait_on_bio_chain(bio_chain);
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error = hib_wait_on_bio_chain(bio_chain);
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if (error)
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goto out;
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offset = alloc_swapdev_block(root_swap);
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@ -441,7 +355,7 @@ static int save_image(struct swap_map_handle *handle,
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printk(KERN_CONT "\b\b\b\b%3d%%", nr_pages / m);
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nr_pages++;
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}
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err2 = wait_on_bio_chain(&bio);
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err2 = hib_wait_on_bio_chain(&bio);
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do_gettimeofday(&stop);
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if (!ret)
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ret = err2;
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@ -553,7 +467,7 @@ static int get_swap_reader(struct swap_map_handle *handle, sector_t start)
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if (!handle->cur)
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return -ENOMEM;
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error = bio_read_page(start, handle->cur, NULL);
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error = hib_bio_read_page(start, handle->cur, NULL);
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if (error) {
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release_swap_reader(handle);
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return error;
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@ -573,17 +487,17 @@ static int swap_read_page(struct swap_map_handle *handle, void *buf,
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offset = handle->cur->entries[handle->k];
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if (!offset)
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return -EFAULT;
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error = bio_read_page(offset, buf, bio_chain);
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error = hib_bio_read_page(offset, buf, bio_chain);
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if (error)
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return error;
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if (++handle->k >= MAP_PAGE_ENTRIES) {
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error = wait_on_bio_chain(bio_chain);
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error = hib_wait_on_bio_chain(bio_chain);
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handle->k = 0;
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offset = handle->cur->next_swap;
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if (!offset)
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release_swap_reader(handle);
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else if (!error)
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error = bio_read_page(offset, handle->cur, NULL);
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error = hib_bio_read_page(offset, handle->cur, NULL);
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}
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return error;
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}
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@ -622,14 +536,14 @@ static int load_image(struct swap_map_handle *handle,
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if (error)
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break;
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if (snapshot->sync_read)
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error = wait_on_bio_chain(&bio);
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error = hib_wait_on_bio_chain(&bio);
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if (error)
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break;
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if (!(nr_pages % m))
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printk("\b\b\b\b%3d%%", nr_pages / m);
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nr_pages++;
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}
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err2 = wait_on_bio_chain(&bio);
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err2 = hib_wait_on_bio_chain(&bio);
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do_gettimeofday(&stop);
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if (!error)
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error = err2;
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@ -686,11 +600,11 @@ int swsusp_check(void)
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{
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int error;
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resume_bdev = open_by_devnum(swsusp_resume_device, FMODE_READ);
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if (!IS_ERR(resume_bdev)) {
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set_blocksize(resume_bdev, PAGE_SIZE);
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hib_resume_bdev = open_by_devnum(swsusp_resume_device, FMODE_READ);
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if (!IS_ERR(hib_resume_bdev)) {
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set_blocksize(hib_resume_bdev, PAGE_SIZE);
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memset(swsusp_header, 0, PAGE_SIZE);
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error = bio_read_page(swsusp_resume_block,
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error = hib_bio_read_page(swsusp_resume_block,
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swsusp_header, NULL);
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if (error)
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goto put;
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@ -698,7 +612,7 @@ int swsusp_check(void)
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if (!memcmp(SWSUSP_SIG, swsusp_header->sig, 10)) {
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memcpy(swsusp_header->sig, swsusp_header->orig_sig, 10);
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/* Reset swap signature now */
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error = bio_write_page(swsusp_resume_block,
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error = hib_bio_write_page(swsusp_resume_block,
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swsusp_header, NULL);
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} else {
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error = -EINVAL;
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@ -706,11 +620,11 @@ int swsusp_check(void)
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put:
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if (error)
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blkdev_put(resume_bdev, FMODE_READ);
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blkdev_put(hib_resume_bdev, FMODE_READ);
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else
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pr_debug("PM: Signature found, resuming\n");
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} else {
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error = PTR_ERR(resume_bdev);
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error = PTR_ERR(hib_resume_bdev);
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}
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if (error)
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@ -725,12 +639,12 @@ put:
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void swsusp_close(fmode_t mode)
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{
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if (IS_ERR(resume_bdev)) {
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if (IS_ERR(hib_resume_bdev)) {
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pr_debug("PM: Image device not initialised\n");
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return;
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}
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blkdev_put(resume_bdev, mode);
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blkdev_put(hib_resume_bdev, mode);
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}
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static int swsusp_header_init(void)
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