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-rw-r--r--kernel/power/swap.c138
1 files changed, 70 insertions, 68 deletions
diff --git a/kernel/power/swap.c b/kernel/power/swap.c
index 9ab989572164..8309d20b2563 100644
--- a/kernel/power/swap.c
+++ b/kernel/power/swap.c
@@ -22,6 +22,7 @@
#include <linux/device.h>
#include <linux/buffer_head.h>
#include <linux/bio.h>
+#include <linux/blkdev.h>
#include <linux/swap.h>
#include <linux/swapops.h>
#include <linux/pm.h>
@@ -214,6 +215,8 @@ static int wait_on_bio_chain(struct bio **bio_chain)
return 0;
bio = *bio_chain;
+ if (bio == NULL)
+ return 0;
while (bio) {
struct page *page;
@@ -349,7 +352,8 @@ int swsusp_write(void)
int error;
if ((error = swsusp_swap_check())) {
- printk(KERN_ERR "swsusp: Cannot find swap device, try swapon -a.\n");
+ printk(KERN_ERR "swsusp: Cannot find swap device, try "
+ "swapon -a.\n");
return error;
}
memset(&snapshot, 0, sizeof(struct snapshot_handle));
@@ -381,27 +385,6 @@ int swsusp_write(void)
return error;
}
-/*
- * Using bio to read from swap.
- * This code requires a bit more work than just using buffer heads
- * but, it is the recommended way for 2.5/2.6.
- * The following are to signal the beginning and end of I/O. Bios
- * finish asynchronously, while we want them to happen synchronously.
- * A simple atomic_t, and a wait loop take care of this problem.
- */
-
-static atomic_t io_done = ATOMIC_INIT(0);
-
-static int end_io(struct bio *bio, unsigned int num, int err)
-{
- if (!test_bit(BIO_UPTODATE, &bio->bi_flags)) {
- printk(KERN_ERR "I/O error reading swsusp image.\n");
- return -EIO;
- }
- atomic_set(&io_done, 0);
- return 0;
-}
-
static struct block_device *resume_bdev;
/**
@@ -409,15 +392,15 @@ static struct block_device *resume_bdev;
* @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 writing, make sure the page is marked as dirty.
- * Then submit it and wait.
+ * 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, pgoff_t page_off, void *page)
+static int submit(int rw, pgoff_t page_off, struct page *page,
+ struct bio **bio_chain)
{
- int error = 0;
struct bio *bio;
bio = bio_alloc(GFP_ATOMIC, 1);
@@ -425,33 +408,40 @@ static int submit(int rw, pgoff_t page_off, void *page)
return -ENOMEM;
bio->bi_sector = page_off * (PAGE_SIZE >> 9);
bio->bi_bdev = resume_bdev;
- bio->bi_end_io = end_io;
+ bio->bi_end_io = end_swap_bio_read;
- if (bio_add_page(bio, virt_to_page(page), PAGE_SIZE, 0) < PAGE_SIZE) {
- printk("swsusp: ERROR: adding page to bio at %ld\n",page_off);
- error = -EFAULT;
- goto Done;
+ if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE) {
+ printk("swsusp: ERROR: adding page to bio at %ld\n", page_off);
+ bio_put(bio);
+ return -EFAULT;
}
- atomic_set(&io_done, 1);
- submit_bio(rw | (1 << BIO_RW_SYNC), bio);
- while (atomic_read(&io_done))
- yield();
- if (rw == READ)
- bio_set_pages_dirty(bio);
- Done:
- bio_put(bio);
- return error;
+ lock_page(page);
+ bio_get(bio);
+
+ if (bio_chain == NULL) {
+ submit_bio(rw | (1 << BIO_RW_SYNC), bio);
+ wait_on_page_locked(page);
+ if (rw == READ)
+ bio_set_pages_dirty(bio);
+ bio_put(bio);
+ } else {
+ get_page(page);
+ bio->bi_private = *bio_chain;
+ *bio_chain = bio;
+ submit_bio(rw | (1 << BIO_RW_SYNC), bio);
+ }
+ return 0;
}
-static int bio_read_page(pgoff_t page_off, void *page)
+static int bio_read_page(pgoff_t page_off, void *addr, struct bio **bio_chain)
{
- return submit(READ, page_off, page);
+ return submit(READ, page_off, virt_to_page(addr), bio_chain);
}
-static int bio_write_page(pgoff_t page_off, void *page)
+static int bio_write_page(pgoff_t page_off, void *addr)
{
- return submit(WRITE, page_off, page);
+ return submit(WRITE, page_off, virt_to_page(addr), NULL);
}
/**
@@ -476,7 +466,7 @@ static int get_swap_reader(struct swap_map_handle *handle,
handle->cur = (struct swap_map_page *)get_zeroed_page(GFP_ATOMIC);
if (!handle->cur)
return -ENOMEM;
- error = bio_read_page(swp_offset(start), handle->cur);
+ error = bio_read_page(swp_offset(start), handle->cur, NULL);
if (error) {
release_swap_reader(handle);
return error;
@@ -485,7 +475,8 @@ static int get_swap_reader(struct swap_map_handle *handle,
return 0;
}
-static int swap_read_page(struct swap_map_handle *handle, void *buf)
+static int swap_read_page(struct swap_map_handle *handle, void *buf,
+ struct bio **bio_chain)
{
unsigned long offset;
int error;
@@ -495,16 +486,17 @@ static int swap_read_page(struct swap_map_handle *handle, void *buf)
offset = handle->cur->entries[handle->k];
if (!offset)
return -EFAULT;
- error = bio_read_page(offset, buf);
+ error = bio_read_page(offset, buf, bio_chain);
if (error)
return error;
if (++handle->k >= MAP_PAGE_ENTRIES) {
+ error = wait_on_bio_chain(bio_chain);
handle->k = 0;
offset = handle->cur->next_swap;
if (!offset)
release_swap_reader(handle);
- else
- error = bio_read_page(offset, handle->cur);
+ else if (!error)
+ error = bio_read_page(offset, handle->cur, NULL);
}
return error;
}
@@ -517,38 +509,48 @@ static int swap_read_page(struct swap_map_handle *handle, void *buf)
static int load_image(struct swap_map_handle *handle,
struct snapshot_handle *snapshot,
- unsigned int nr_pages)
+ unsigned int nr_to_read)
{
unsigned int m;
- int ret;
int error = 0;
struct timeval start;
struct timeval stop;
+ struct bio *bio;
+ int err2;
+ unsigned nr_pages;
- printk("Loading image data pages (%u pages) ... ", nr_pages);
- m = nr_pages / 100;
+ printk("Loading image data pages (%u pages) ... ", nr_to_read);
+ m = nr_to_read / 100;
if (!m)
m = 1;
nr_pages = 0;
+ bio = NULL;
do_gettimeofday(&start);
- do {
- ret = snapshot_write_next(snapshot, PAGE_SIZE);
- if (ret > 0) {
- error = swap_read_page(handle, data_of(*snapshot));
- if (error)
- break;
- if (!(nr_pages % m))
- printk("\b\b\b\b%3d%%", nr_pages / m);
- nr_pages++;
- }
- } while (ret > 0);
+ for ( ; ; ) {
+ error = snapshot_write_next(snapshot, PAGE_SIZE);
+ if (error <= 0)
+ break;
+ error = swap_read_page(handle, data_of(*snapshot), &bio);
+ if (error)
+ break;
+ if (snapshot->sync_read)
+ error = wait_on_bio_chain(&bio);
+ if (error)
+ break;
+ if (!(nr_pages % m))
+ printk("\b\b\b\b%3d%%", nr_pages / m);
+ nr_pages++;
+ }
+ err2 = wait_on_bio_chain(&bio);
do_gettimeofday(&stop);
+ if (!error)
+ error = err2;
if (!error) {
printk("\b\b\b\bdone\n");
if (!snapshot_image_loaded(snapshot))
error = -ENODATA;
}
- show_speed(&start, &stop, nr_pages, "Read");
+ show_speed(&start, &stop, nr_to_read, "Read");
return error;
}
@@ -571,7 +573,7 @@ int swsusp_read(void)
header = (struct swsusp_info *)data_of(snapshot);
error = get_swap_reader(&handle, swsusp_header.image);
if (!error)
- error = swap_read_page(&handle, header);
+ error = swap_read_page(&handle, header, NULL);
if (!error)
error = load_image(&handle, &snapshot, header->pages - 1);
release_swap_reader(&handle);
@@ -597,7 +599,7 @@ int swsusp_check(void)
if (!IS_ERR(resume_bdev)) {
set_blocksize(resume_bdev, PAGE_SIZE);
memset(&swsusp_header, 0, sizeof(swsusp_header));
- if ((error = bio_read_page(0, &swsusp_header)))
+ if ((error = bio_read_page(0, &swsusp_header, NULL)))
return error;
if (!memcmp(SWSUSP_SIG, swsusp_header.sig, 10)) {
memcpy(swsusp_header.sig, swsusp_header.orig_sig, 10);
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-24 23:10:50 +0000