[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>

diff --git a/kernel/power/swap.c b/kernel/power/swap.c
index 7b10da16389e514b9a8342627cedf697c68f28a3..7768c2ba7550cc4a088b344c4e07d75d832d97d4 100644 (file)
--- a/kernel/power/swap.c
+++ b/kernel/power/swap.c
@@ -41,10 +41,121 @@ static struct swsusp_header {
 } __attribute__((packed, aligned(PAGE_SIZE))) swsusp_header;
 
 /*
- * Saving part...
+ * General things
  */
 
 static unsigned short root_swap = 0xffff;
+static struct block_device *resume_bdev;
+
+/**
+ *     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, pgoff_t page_off, struct page *page,
+                       struct bio **bio_chain)
+{
+       struct bio *bio;
+
+       bio = bio_alloc(GFP_ATOMIC, 1);
+       if (!bio)
+               return -ENOMEM;
+       bio->bi_sector = page_off * (PAGE_SIZE >> 9);
+       bio->bi_bdev = resume_bdev;
+       bio->bi_end_io = end_swap_bio_read;
+
+       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;
+       }
+
+       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 {
+               if (rw == READ)
+                       get_page(page); /* These pages are freed later */
+               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 *addr, struct bio **bio_chain)
+{
+       return submit(READ, page_off, virt_to_page(addr), bio_chain);
+}
+
+static int bio_write_page(pgoff_t page_off, void *addr)
+{
+       return submit(WRITE, page_off, virt_to_page(addr), NULL);
+}
+
+static int 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;
+}
+
+static void show_speed(struct timeval *start, struct timeval *stop,
+                       unsigned nr_pages, char *msg)
+{
+       s64 elapsed_centisecs64;
+       int centisecs;
+       int k;
+       int kps;
+
+       elapsed_centisecs64 = timeval_to_ns(stop) - timeval_to_ns(start);
+       do_div(elapsed_centisecs64, NSEC_PER_SEC / 100);
+       centisecs = elapsed_centisecs64;
+       if (centisecs == 0)
+               centisecs = 1;  /* avoid div-by-zero */
+       k = nr_pages * (PAGE_SIZE / 1024);
+       kps = (k * 100) / centisecs;
+       printk("%s %d kbytes in %d.%02d seconds (%d.%02d MB/s)\n", msg, k,
+                       centisecs / 100, centisecs % 100,
+                       kps / 1000, (kps % 1000) / 10);
+}
+
+/*
+ * Saving part
+ */
 
 static int mark_swapfiles(swp_entry_t start)
 {
@@ -166,26 +277,6 @@ static void release_swap_writer(struct swap_map_handle *handle)
        handle->bitmap = NULL;
 }
 
-static void show_speed(struct timeval *start, struct timeval *stop,
-                       unsigned nr_pages, char *msg)
-{
-       s64 elapsed_centisecs64;
-       int centisecs;
-       int k;
-       int kps;
-
-       elapsed_centisecs64 = timeval_to_ns(stop) - timeval_to_ns(start);
-       do_div(elapsed_centisecs64, NSEC_PER_SEC / 100);
-       centisecs = elapsed_centisecs64;
-       if (centisecs == 0)
-               centisecs = 1;  /* avoid div-by-zero */
-       k = nr_pages * (PAGE_SIZE / 1024);
-       kps = (k * 100) / centisecs;
-       printk("%s %d kbytes in %d.%02d seconds (%d.%02d MB/s)\n", msg, k,
-                       centisecs / 100, centisecs % 100,
-                       kps / 1000, (kps % 1000) / 10);
-}
-
 static int get_swap_writer(struct swap_map_handle *handle)
 {
        handle->cur = (struct swap_map_page *)get_zeroed_page(GFP_KERNEL);
@@ -205,34 +296,6 @@ static int get_swap_writer(struct swap_map_handle *handle)
        return 0;
 }
 
-static int 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;
-}
-
 static int swap_write_page(struct swap_map_handle *handle, void *buf,
                                struct bio **bio_chain)
 {
@@ -384,66 +447,6 @@ int swsusp_write(void)
        return error;
 }
 
-static struct block_device *resume_bdev;
-
-/**
- *     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, pgoff_t page_off, struct page *page,
-                       struct bio **bio_chain)
-{
-       struct bio *bio;
-
-       bio = bio_alloc(GFP_ATOMIC, 1);
-       if (!bio)
-               return -ENOMEM;
-       bio->bi_sector = page_off * (PAGE_SIZE >> 9);
-       bio->bi_bdev = resume_bdev;
-       bio->bi_end_io = end_swap_bio_read;
-
-       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;
-       }
-
-       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 {
-               if (rw == READ)
-                       get_page(page); /* These pages are freed later */
-               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 *addr, struct bio **bio_chain)
-{
-       return submit(READ, page_off, virt_to_page(addr), bio_chain);
-}
-
-static int bio_write_page(pgoff_t page_off, void *addr)
-{
-       return submit(WRITE, page_off, virt_to_page(addr), NULL);
-}
-
 /**
  *     The following functions allow us to read data using a swap map
  *     in a file-alike way