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PM / Hibernate: Move the first_sector out of swsusp_write

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The first sector knowledge is swap-only specific. Move it into the
swap handle. This will be needed for later non-swap specific code
moving into snapshot.c.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: "Rafael J. Wysocki" <rjw@sisk.pl>
This commit is contained in:
Jiri Slaby 2010-05-01 23:53:02 +02:00 committed by Rafael J. Wysocki
parent 8a0d613fa1
commit 51fb352b2c
1 changed files with 38 additions and 38 deletions
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76
kernel/power/swap.c
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@ -29,6 +29,40 @@
#define SWSUSP_SIG "S1SUSPEND"
/*
* The swap map is a data structure used for keeping track of each page
* written to a swap partition. It consists of many swap_map_page
* structures that contain each an array of MAP_PAGE_SIZE swap entries.
* These structures are stored on the swap and linked together with the
* help of the .next_swap member.
*
* The swap map is created during suspend. The swap map pages are
* allocated and populated one at a time, so we only need one memory
* page to set up the entire structure.
*
* During resume we also only need to use one swap_map_page structure
* at a time.
*/
#define MAP_PAGE_ENTRIES (PAGE_SIZE / sizeof(sector_t) - 1)
struct swap_map_page {
sector_t entries[MAP_PAGE_ENTRIES];
sector_t next_swap;
};
/**
* The swap_map_handle structure is used for handling swap in
* a file-alike way
*/
struct swap_map_handle {
struct swap_map_page *cur;
sector_t cur_swap;
sector_t first_sector;
unsigned int k;
};
struct swsusp_header {
char reserved[PAGE_SIZE - 20 - sizeof(sector_t) - sizeof(int)];
sector_t image;
@ -151,7 +185,7 @@ struct block_device *hib_resume_bdev;
* Saving part
*/
static int mark_swapfiles(sector_t start, unsigned int flags)
static int mark_swapfiles(struct swap_map_handle *handle, unsigned int flags)
{
int error;
@ -160,7 +194,7 @@ static int mark_swapfiles(sector_t start, unsigned int flags)
!memcmp("SWAPSPACE2",swsusp_header->sig, 10)) {
memcpy(swsusp_header->orig_sig,swsusp_header->sig, 10);
memcpy(swsusp_header->sig,SWSUSP_SIG, 10);
swsusp_header->image = start;
swsusp_header->image = handle->first_sector;
swsusp_header->flags = flags;
error = hib_bio_write_page(swsusp_resume_block,
swsusp_header, NULL);
@ -226,39 +260,6 @@ static int write_page(void *buf, sector_t offset, struct bio **bio_chain)
return hib_bio_write_page(offset, src, bio_chain);
}
/*
* The swap map is a data structure used for keeping track of each page
* written to a swap partition. It consists of many swap_map_page
* structures that contain each an array of MAP_PAGE_SIZE swap entries.
* These structures are stored on the swap and linked together with the
* help of the .next_swap member.
*
* The swap map is created during suspend. The swap map pages are
* allocated and populated one at a time, so we only need one memory
* page to set up the entire structure.
*
* During resume we also only need to use one swap_map_page structure
* at a time.
*/
#define MAP_PAGE_ENTRIES (PAGE_SIZE / sizeof(sector_t) - 1)
struct swap_map_page {
sector_t entries[MAP_PAGE_ENTRIES];
sector_t next_swap;
};
/**
* The swap_map_handle structure is used for handling swap in
* a file-alike way
*/
struct swap_map_handle {
struct swap_map_page *cur;
sector_t cur_swap;
unsigned int k;
};
static void release_swap_writer(struct swap_map_handle *handle)
{
if (handle->cur)
@ -277,6 +278,7 @@ static int get_swap_writer(struct swap_map_handle *handle)
return -ENOSPC;
}
handle->k = 0;
handle->first_sector = handle->cur_swap;
return 0;
}
@ -421,8 +423,6 @@ int swsusp_write(unsigned int flags)
}
error = get_swap_writer(&handle);
if (!error) {
sector_t start = handle.cur_swap;
error = swap_write_page(&handle, header, NULL);
if (!error)
error = save_image(&handle, &snapshot,
@ -431,7 +431,7 @@ int swsusp_write(unsigned int flags)
if (!error) {
flush_swap_writer(&handle);
printk(KERN_INFO "PM: S");
error = mark_swapfiles(start, flags);
error = mark_swapfiles(&handle, flags);
printk("|\n");
}
}