suspend: simplify block I/O handling
Stop abusing struct page functionality and the swap end_io handler, and instead add a modified version of the blk-lib.c bio_batch helpers. Also move the block I/O code into swap.c as they are directly tied into each other. Signed-off-by: Christoph Hellwig <hch@lst.de> Tested-by: Pavel Machek <pavel@ucw.cz> Tested-by: Ming Lin <mlin@kernel.org> Acked-by: Pavel Machek <pavel@ucw.cz> Acked-by: Rafael J. Wysocki <rjw@rjwysocki.net> Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Christoph Hellwig
Jens Axboe
Родитель
b2dbe0a60f
Коммит
343df3c79c
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@ -377,7 +377,6 @@ extern void end_swap_bio_write(struct bio *bio, int err);
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extern int __swap_writepage(struct page *page, struct writeback_control *wbc,
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void (*end_write_func)(struct bio *, int));
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extern int swap_set_page_dirty(struct page *page);
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extern void end_swap_bio_read(struct bio *bio, int err);
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int add_swap_extent(struct swap_info_struct *sis, unsigned long start_page,
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unsigned long nr_pages, sector_t start_block);
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@ -7,8 +7,7 @@ obj-$(CONFIG_VT_CONSOLE_SLEEP) += console.o
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obj-$(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-$(CONFIG_HIBERNATION) += hibernate.o snapshot.o swap.o user.o \
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block_io.o
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obj-$(CONFIG_HIBERNATION) += hibernate.o snapshot.o swap.o user.o
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obj-$(CONFIG_PM_AUTOSLEEP) += autosleep.o
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obj-$(CONFIG_PM_WAKELOCKS) += wakelock.o
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@ -1,103 +0,0 @@
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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 | REQ_SYNC;
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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_iter.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 %llu\n",
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(unsigned long long)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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@ -163,15 +163,6 @@ extern void swsusp_close(fmode_t);
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extern int swsusp_unmark(void);
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#endif
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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(ktime_t, ktime_t, unsigned int, char *);
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@ -212,7 +212,84 @@ int swsusp_swap_in_use(void)
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*/
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static unsigned short root_swap = 0xffff;
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struct block_device *hib_resume_bdev;
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static struct block_device *hib_resume_bdev;
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struct hib_bio_batch {
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atomic_t count;
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wait_queue_head_t wait;
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int error;
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};
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static void hib_init_batch(struct hib_bio_batch *hb)
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{
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atomic_set(&hb->count, 0);
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init_waitqueue_head(&hb->wait);
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hb->error = 0;
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}
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static void hib_end_io(struct bio *bio, int error)
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{
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struct hib_bio_batch *hb = bio->bi_private;
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const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
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struct page *page = bio->bi_io_vec[0].bv_page;
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if (!uptodate || error) {
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printk(KERN_ALERT "Read-error on swap-device (%u:%u:%Lu)\n",
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imajor(bio->bi_bdev->bd_inode),
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iminor(bio->bi_bdev->bd_inode),
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(unsigned long long)bio->bi_iter.bi_sector);
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if (!error)
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error = -EIO;
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}
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if (bio_data_dir(bio) == WRITE)
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put_page(page);
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if (error && !hb->error)
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hb->error = error;
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if (atomic_dec_and_test(&hb->count))
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wake_up(&hb->wait);
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bio_put(bio);
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}
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static int hib_submit_io(int rw, pgoff_t page_off, void *addr,
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struct hib_bio_batch *hb)
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{
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struct page *page = virt_to_page(addr);
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struct bio *bio;
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int error = 0;
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bio = bio_alloc(__GFP_WAIT | __GFP_HIGH, 1);
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bio->bi_iter.bi_sector = page_off * (PAGE_SIZE >> 9);
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bio->bi_bdev = hib_resume_bdev;
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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 %llu\n",
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(unsigned long long)bio->bi_iter.bi_sector);
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bio_put(bio);
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return -EFAULT;
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}
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if (hb) {
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bio->bi_end_io = hib_end_io;
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bio->bi_private = hb;
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atomic_inc(&hb->count);
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submit_bio(rw, bio);
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} else {
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error = submit_bio_wait(rw, bio);
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bio_put(bio);
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}
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return error;
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}
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static int hib_wait_io(struct hib_bio_batch *hb)
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{
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wait_event(hb->wait, atomic_read(&hb->count) == 0);
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return hb->error;
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}
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/*
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* Saving part
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@ -222,7 +299,7 @@ static int mark_swapfiles(struct swap_map_handle *handle, unsigned int flags)
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{
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int error;
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hib_bio_read_page(swsusp_resume_block, swsusp_header, NULL);
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hib_submit_io(READ_SYNC, 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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@ -231,7 +308,7 @@ static int mark_swapfiles(struct swap_map_handle *handle, unsigned int flags)
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swsusp_header->flags = flags;
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if (flags & SF_CRC32_MODE)
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swsusp_header->crc32 = handle->crc32;
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error = hib_bio_write_page(swsusp_resume_block,
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error = hib_submit_io(WRITE_SYNC, 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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@ -271,10 +348,10 @@ static int swsusp_swap_check(void)
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* write_page - Write one page to given swap location.
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* @buf: Address we're writing.
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* @offset: Offset of the swap page we're writing to.
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* @bio_chain: Link the next write BIO here
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* @hb: bio completion batch
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*/
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static int write_page(void *buf, sector_t offset, struct bio **bio_chain)
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static int write_page(void *buf, sector_t offset, struct hib_bio_batch *hb)
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{
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void *src;
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int ret;
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@ -282,13 +359,13 @@ static int write_page(void *buf, sector_t offset, struct bio **bio_chain)
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if (!offset)
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return -ENOSPC;
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if (bio_chain) {
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if (hb) {
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src = (void *)__get_free_page(__GFP_WAIT | __GFP_NOWARN |
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__GFP_NORETRY);
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if (src) {
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copy_page(src, buf);
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} else {
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ret = hib_wait_on_bio_chain(bio_chain); /* Free pages */
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ret = hib_wait_io(hb); /* Free pages */
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if (ret)
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return ret;
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src = (void *)__get_free_page(__GFP_WAIT |
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@ -298,14 +375,14 @@ static int write_page(void *buf, sector_t offset, struct bio **bio_chain)
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copy_page(src, buf);
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} else {
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WARN_ON_ONCE(1);
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bio_chain = NULL; /* Go synchronous */
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hb = NULL; /* Go synchronous */
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src = buf;
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}
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}
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} else {
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src = buf;
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}
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return hib_bio_write_page(offset, src, bio_chain);
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return hib_submit_io(WRITE_SYNC, offset, src, hb);
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}
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static void release_swap_writer(struct swap_map_handle *handle)
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@ -348,7 +425,7 @@ err_close:
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}
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static int swap_write_page(struct swap_map_handle *handle, void *buf,
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struct bio **bio_chain)
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struct hib_bio_batch *hb)
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{
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int error = 0;
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sector_t offset;
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@ -356,7 +433,7 @@ static int swap_write_page(struct swap_map_handle *handle, void *buf,
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if (!handle->cur)
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return -EINVAL;
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offset = alloc_swapdev_block(root_swap);
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error = write_page(buf, offset, bio_chain);
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error = write_page(buf, offset, hb);
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if (error)
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return error;
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handle->cur->entries[handle->k++] = offset;
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@ -365,15 +442,15 @@ static int swap_write_page(struct swap_map_handle *handle, void *buf,
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if (!offset)
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return -ENOSPC;
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handle->cur->next_swap = offset;
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error = write_page(handle->cur, handle->cur_swap, bio_chain);
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error = write_page(handle->cur, handle->cur_swap, hb);
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if (error)
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goto out;
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clear_page(handle->cur);
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handle->cur_swap = offset;
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handle->k = 0;
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if (bio_chain && low_free_pages() <= handle->reqd_free_pages) {
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error = hib_wait_on_bio_chain(bio_chain);
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if (hb && low_free_pages() <= handle->reqd_free_pages) {
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error = hib_wait_io(hb);
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if (error)
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goto out;
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/*
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@ -445,23 +522,24 @@ static int save_image(struct swap_map_handle *handle,
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int ret;
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int nr_pages;
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int err2;
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struct bio *bio;
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struct hib_bio_batch hb;
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ktime_t start;
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ktime_t stop;
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hib_init_batch(&hb);
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printk(KERN_INFO "PM: Saving image data pages (%u pages)...\n",
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nr_to_write);
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m = nr_to_write / 10;
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if (!m)
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m = 1;
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nr_pages = 0;
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bio = NULL;
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start = ktime_get();
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while (1) {
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ret = snapshot_read_next(snapshot);
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if (ret <= 0)
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break;
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ret = swap_write_page(handle, data_of(*snapshot), &bio);
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ret = swap_write_page(handle, data_of(*snapshot), &hb);
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if (ret)
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break;
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if (!(nr_pages % m))
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@ -469,7 +547,7 @@ static int save_image(struct swap_map_handle *handle,
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nr_pages / m * 10);
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nr_pages++;
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}
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err2 = hib_wait_on_bio_chain(&bio);
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err2 = hib_wait_io(&hb);
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stop = ktime_get();
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if (!ret)
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ret = err2;
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@ -580,7 +658,7 @@ static int save_image_lzo(struct swap_map_handle *handle,
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int ret = 0;
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int nr_pages;
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int err2;
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struct bio *bio;
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struct hib_bio_batch hb;
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ktime_t start;
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ktime_t stop;
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size_t off;
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@ -589,6 +667,8 @@ static int save_image_lzo(struct swap_map_handle *handle,
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struct cmp_data *data = NULL;
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struct crc_data *crc = NULL;
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hib_init_batch(&hb);
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|
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/*
|
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* We'll limit the number of threads for compression to limit memory
|
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* footprint.
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|
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@ -674,7 +754,6 @@ static int save_image_lzo(struct swap_map_handle *handle,
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if (!m)
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m = 1;
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nr_pages = 0;
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bio = NULL;
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start = ktime_get();
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for (;;) {
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for (thr = 0; thr < nr_threads; thr++) {
|
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|
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@ -748,7 +827,7 @@ static int save_image_lzo(struct swap_map_handle *handle,
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off += PAGE_SIZE) {
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memcpy(page, data[thr].cmp + off, PAGE_SIZE);
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|
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ret = swap_write_page(handle, page, &bio);
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ret = swap_write_page(handle, page, &hb);
|
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if (ret)
|
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goto out_finish;
|
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}
|
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|
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@ -759,7 +838,7 @@ static int save_image_lzo(struct swap_map_handle *handle,
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}
|
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|
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out_finish:
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err2 = hib_wait_on_bio_chain(&bio);
|
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err2 = hib_wait_io(&hb);
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stop = ktime_get();
|
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if (!ret)
|
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ret = err2;
|
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|
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@ -906,7 +985,7 @@ static int get_swap_reader(struct swap_map_handle *handle,
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return -ENOMEM;
|
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}
|
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|
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error = hib_bio_read_page(offset, tmp->map, NULL);
|
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error = hib_submit_io(READ_SYNC, offset, tmp->map, 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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|
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@ -919,7 +998,7 @@ static int get_swap_reader(struct swap_map_handle *handle,
|
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}
|
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|
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static int swap_read_page(struct swap_map_handle *handle, void *buf,
|
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struct bio **bio_chain)
|
||||
struct hib_bio_batch *hb)
|
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{
|
||||
sector_t offset;
|
||||
int error;
|
||||
|
|
@ -930,7 +1009,7 @@ static int swap_read_page(struct swap_map_handle *handle, void *buf,
|
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offset = handle->cur->entries[handle->k];
|
||||
if (!offset)
|
||||
return -EFAULT;
|
||||
error = hib_bio_read_page(offset, buf, bio_chain);
|
||||
error = hib_submit_io(READ_SYNC, offset, buf, hb);
|
||||
if (error)
|
||||
return error;
|
||||
if (++handle->k >= MAP_PAGE_ENTRIES) {
|
||||
|
|
@ -968,27 +1047,28 @@ static int load_image(struct swap_map_handle *handle,
|
|||
int ret = 0;
|
||||
ktime_t start;
|
||||
ktime_t stop;
|
||||
struct bio *bio;
|
||||
struct hib_bio_batch hb;
|
||||
int err2;
|
||||
unsigned nr_pages;
|
||||
|
||||
hib_init_batch(&hb);
|
||||
|
||||
printk(KERN_INFO "PM: Loading image data pages (%u pages)...\n",
|
||||
nr_to_read);
|
||||
m = nr_to_read / 10;
|
||||
if (!m)
|
||||
m = 1;
|
||||
nr_pages = 0;
|
||||
bio = NULL;
|
||||
start = ktime_get();
|
||||
for ( ; ; ) {
|
||||
ret = snapshot_write_next(snapshot);
|
||||
if (ret <= 0)
|
||||
break;
|
||||
ret = swap_read_page(handle, data_of(*snapshot), &bio);
|
||||
ret = swap_read_page(handle, data_of(*snapshot), &hb);
|
||||
if (ret)
|
||||
break;
|
||||
if (snapshot->sync_read)
|
||||
ret = hib_wait_on_bio_chain(&bio);
|
||||
ret = hib_wait_io(&hb);
|
||||
if (ret)
|
||||
break;
|
||||
if (!(nr_pages % m))
|
||||
|
|
@ -996,7 +1076,7 @@ static int load_image(struct swap_map_handle *handle,
|
|||
nr_pages / m * 10);
|
||||
nr_pages++;
|
||||
}
|
||||
err2 = hib_wait_on_bio_chain(&bio);
|
||||
err2 = hib_wait_io(&hb);
|
||||
stop = ktime_get();
|
||||
if (!ret)
|
||||
ret = err2;
|
||||
|
|
@ -1067,7 +1147,7 @@ static int load_image_lzo(struct swap_map_handle *handle,
|
|||
unsigned int m;
|
||||
int ret = 0;
|
||||
int eof = 0;
|
||||
struct bio *bio;
|
||||
struct hib_bio_batch hb;
|
||||
ktime_t start;
|
||||
ktime_t stop;
|
||||
unsigned nr_pages;
|
||||
|
|
@ -1080,6 +1160,8 @@ static int load_image_lzo(struct swap_map_handle *handle,
|
|||
struct dec_data *data = NULL;
|
||||
struct crc_data *crc = NULL;
|
||||
|
||||
hib_init_batch(&hb);
|
||||
|
||||
/*
|
||||
* We'll limit the number of threads for decompression to limit memory
|
||||
* footprint.
|
||||
|
|
@ -1190,7 +1272,6 @@ static int load_image_lzo(struct swap_map_handle *handle,
|
|||
if (!m)
|
||||
m = 1;
|
||||
nr_pages = 0;
|
||||
bio = NULL;
|
||||
start = ktime_get();
|
||||
|
||||
ret = snapshot_write_next(snapshot);
|
||||
|
|
@ -1199,7 +1280,7 @@ static int load_image_lzo(struct swap_map_handle *handle,
|
|||
|
||||
for(;;) {
|
||||
for (i = 0; !eof && i < want; i++) {
|
||||
ret = swap_read_page(handle, page[ring], &bio);
|
||||
ret = swap_read_page(handle, page[ring], &hb);
|
||||
if (ret) {
|
||||
/*
|
||||
* On real read error, finish. On end of data,
|
||||
|
|
@ -1226,7 +1307,7 @@ static int load_image_lzo(struct swap_map_handle *handle,
|
|||
if (!asked)
|
||||
break;
|
||||
|
||||
ret = hib_wait_on_bio_chain(&bio);
|
||||
ret = hib_wait_io(&hb);
|
||||
if (ret)
|
||||
goto out_finish;
|
||||
have += asked;
|
||||
|
|
@ -1281,7 +1362,7 @@ static int load_image_lzo(struct swap_map_handle *handle,
|
|||
* Wait for more data while we are decompressing.
|
||||
*/
|
||||
if (have < LZO_CMP_PAGES && asked) {
|
||||
ret = hib_wait_on_bio_chain(&bio);
|
||||
ret = hib_wait_io(&hb);
|
||||
if (ret)
|
||||
goto out_finish;
|
||||
have += asked;
|
||||
|
|
@ -1430,7 +1511,7 @@ int swsusp_check(void)
|
|||
if (!IS_ERR(hib_resume_bdev)) {
|
||||
set_blocksize(hib_resume_bdev, PAGE_SIZE);
|
||||
clear_page(swsusp_header);
|
||||
error = hib_bio_read_page(swsusp_resume_block,
|
||||
error = hib_submit_io(READ_SYNC, swsusp_resume_block,
|
||||
swsusp_header, NULL);
|
||||
if (error)
|
||||
goto put;
|
||||
|
|
@ -1438,7 +1519,7 @@ int swsusp_check(void)
|
|||
if (!memcmp(HIBERNATE_SIG, swsusp_header->sig, 10)) {
|
||||
memcpy(swsusp_header->sig, swsusp_header->orig_sig, 10);
|
||||
/* Reset swap signature now */
|
||||
error = hib_bio_write_page(swsusp_resume_block,
|
||||
error = hib_submit_io(WRITE_SYNC, swsusp_resume_block,
|
||||
swsusp_header, NULL);
|
||||
} else {
|
||||
error = -EINVAL;
|
||||
|
|
@ -1482,10 +1563,10 @@ int swsusp_unmark(void)
|
|||
{
|
||||
int error;
|
||||
|
||||
hib_bio_read_page(swsusp_resume_block, swsusp_header, NULL);
|
||||
hib_submit_io(READ_SYNC, swsusp_resume_block, swsusp_header, NULL);
|
||||
if (!memcmp(HIBERNATE_SIG,swsusp_header->sig, 10)) {
|
||||
memcpy(swsusp_header->sig,swsusp_header->orig_sig, 10);
|
||||
error = hib_bio_write_page(swsusp_resume_block,
|
||||
error = hib_submit_io(WRITE_SYNC, swsusp_resume_block,
|
||||
swsusp_header, NULL);
|
||||
} else {
|
||||
printk(KERN_ERR "PM: Cannot find swsusp signature!\n");
|
||||
|
|
|
|||
|
|
@ -69,7 +69,7 @@ void end_swap_bio_write(struct bio *bio, int err)
|
|||
bio_put(bio);
|
||||
}
|
||||
|
||||
void end_swap_bio_read(struct bio *bio, int err)
|
||||
static void end_swap_bio_read(struct bio *bio, int err)
|
||||
{
|
||||
const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
|
||||
struct page *page = bio->bi_io_vec[0].bv_page;
|
||||
|
|
|
|||
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