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[PATCH] swsusp: rearrange swap-handling code
Rearrange the code in kernel/power/swap.c so that the next patch is more readable. [This patch only moves the existing code.] Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Acked-by: Pavel Machek <pavel@ucw.cz> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Rafael J. Wysocki
Linus Torvalds
parent
915bae9ebe
commit
3fc6b34f48
@ -41,10 +41,121 @@ static struct swsusp_header {
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} __attribute__((packed, aligned(PAGE_SIZE))) swsusp_header;
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/*
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* Saving part...
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* General things
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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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struct bio *bio;
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bio = bio_alloc(GFP_ATOMIC, 1);
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if (!bio)
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return -ENOMEM;
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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("swsusp: ERROR: adding page to bio at %ld\n", 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(rw | (1 << BIO_RW_SYNC), 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(rw | (1 << BIO_RW_SYNC), 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)
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{
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return submit(WRITE, page_off, virt_to_page(addr), NULL);
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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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static void show_speed(struct timeval *start, struct timeval *stop,
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unsigned nr_pages, char *msg)
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{
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s64 elapsed_centisecs64;
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int centisecs;
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int k;
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int kps;
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elapsed_centisecs64 = timeval_to_ns(stop) - timeval_to_ns(start);
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do_div(elapsed_centisecs64, NSEC_PER_SEC / 100);
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centisecs = elapsed_centisecs64;
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if (centisecs == 0)
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centisecs = 1; /* avoid div-by-zero */
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k = nr_pages * (PAGE_SIZE / 1024);
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kps = (k * 100) / centisecs;
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printk("%s %d kbytes in %d.%02d seconds (%d.%02d MB/s)\n", msg, k,
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centisecs / 100, centisecs % 100,
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kps / 1000, (kps % 1000) / 10);
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}
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/*
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* Saving part
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*/
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static int mark_swapfiles(swp_entry_t start)
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{
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@ -166,26 +277,6 @@ static void release_swap_writer(struct swap_map_handle *handle)
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handle->bitmap = NULL;
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}
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static void show_speed(struct timeval *start, struct timeval *stop,
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unsigned nr_pages, char *msg)
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{
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s64 elapsed_centisecs64;
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int centisecs;
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int k;
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int kps;
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elapsed_centisecs64 = timeval_to_ns(stop) - timeval_to_ns(start);
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do_div(elapsed_centisecs64, NSEC_PER_SEC / 100);
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centisecs = elapsed_centisecs64;
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if (centisecs == 0)
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centisecs = 1; /* avoid div-by-zero */
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k = nr_pages * (PAGE_SIZE / 1024);
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kps = (k * 100) / centisecs;
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printk("%s %d kbytes in %d.%02d seconds (%d.%02d MB/s)\n", msg, k,
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centisecs / 100, centisecs % 100,
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kps / 1000, (kps % 1000) / 10);
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}
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static int get_swap_writer(struct swap_map_handle *handle)
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{
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handle->cur = (struct swap_map_page *)get_zeroed_page(GFP_KERNEL);
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@ -205,34 +296,6 @@ static int get_swap_writer(struct swap_map_handle *handle)
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return 0;
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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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static int swap_write_page(struct swap_map_handle *handle, void *buf,
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struct bio **bio_chain)
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{
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@ -384,66 +447,6 @@ int swsusp_write(void)
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return error;
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}
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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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struct bio *bio;
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bio = bio_alloc(GFP_ATOMIC, 1);
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if (!bio)
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return -ENOMEM;
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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("swsusp: ERROR: adding page to bio at %ld\n", 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(rw | (1 << BIO_RW_SYNC), 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(rw | (1 << BIO_RW_SYNC), 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)
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{
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return submit(WRITE, page_off, virt_to_page(addr), NULL);
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}
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/**
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* The following functions allow us to read data using a swap map
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* in a file-alike way
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