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Diffstat (limited to 'kernel/power/swap.c')
-rw-r--r--kernel/power/swap.c60
1 files changed, 32 insertions, 28 deletions
diff --git a/kernel/power/swap.c b/kernel/power/swap.c
index 3581f8f86ac..e83ed9945a8 100644
--- a/kernel/power/swap.c
+++ b/kernel/power/swap.c
@@ -33,12 +33,14 @@ extern char resume_file[];
#define SWSUSP_SIG "S1SUSPEND"
-static struct swsusp_header {
+struct swsusp_header {
char reserved[PAGE_SIZE - 20 - sizeof(sector_t)];
sector_t image;
char orig_sig[10];
char sig[10];
-} __attribute__((packed, aligned(PAGE_SIZE))) swsusp_header;
+} __attribute__((packed));
+
+static struct swsusp_header *swsusp_header;
/*
* General things
@@ -141,14 +143,14 @@ static int mark_swapfiles(sector_t start)
{
int error;
- bio_read_page(swsusp_resume_block, &swsusp_header, NULL);
- if (!memcmp("SWAP-SPACE",swsusp_header.sig, 10) ||
- !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;
+ bio_read_page(swsusp_resume_block, swsusp_header, NULL);
+ if (!memcmp("SWAP-SPACE",swsusp_header->sig, 10) ||
+ !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;
error = bio_write_page(swsusp_resume_block,
- &swsusp_header, NULL);
+ swsusp_header, NULL);
} else {
printk(KERN_ERR "swsusp: Swap header not found!\n");
error = -ENODEV;
@@ -241,7 +243,6 @@ struct swap_map_page {
struct swap_map_handle {
struct swap_map_page *cur;
sector_t cur_swap;
- struct bitmap_page *bitmap;
unsigned int k;
};
@@ -250,9 +251,6 @@ static void release_swap_writer(struct swap_map_handle *handle)
if (handle->cur)
free_page((unsigned long)handle->cur);
handle->cur = NULL;
- if (handle->bitmap)
- free_bitmap(handle->bitmap);
- handle->bitmap = NULL;
}
static int get_swap_writer(struct swap_map_handle *handle)
@@ -260,12 +258,7 @@ static int get_swap_writer(struct swap_map_handle *handle)
handle->cur = (struct swap_map_page *)get_zeroed_page(GFP_KERNEL);
if (!handle->cur)
return -ENOMEM;
- handle->bitmap = alloc_bitmap(count_swap_pages(root_swap, 0));
- if (!handle->bitmap) {
- release_swap_writer(handle);
- return -ENOMEM;
- }
- handle->cur_swap = alloc_swapdev_block(root_swap, handle->bitmap);
+ handle->cur_swap = alloc_swapdev_block(root_swap);
if (!handle->cur_swap) {
release_swap_writer(handle);
return -ENOSPC;
@@ -282,7 +275,7 @@ static int swap_write_page(struct swap_map_handle *handle, void *buf,
if (!handle->cur)
return -EINVAL;
- offset = alloc_swapdev_block(root_swap, handle->bitmap);
+ offset = alloc_swapdev_block(root_swap);
error = write_page(buf, offset, bio_chain);
if (error)
return error;
@@ -291,7 +284,7 @@ static int swap_write_page(struct swap_map_handle *handle, void *buf,
error = wait_on_bio_chain(bio_chain);
if (error)
goto out;
- offset = alloc_swapdev_block(root_swap, handle->bitmap);
+ offset = alloc_swapdev_block(root_swap);
if (!offset)
return -ENOSPC;
handle->cur->next_swap = offset;
@@ -428,7 +421,8 @@ int swsusp_write(void)
}
}
if (error)
- free_all_swap_pages(root_swap, handle.bitmap);
+ free_all_swap_pages(root_swap);
+
release_swap_writer(&handle);
out:
swsusp_close();
@@ -564,7 +558,7 @@ int swsusp_read(void)
if (error < PAGE_SIZE)
return error < 0 ? error : -EFAULT;
header = (struct swsusp_info *)data_of(snapshot);
- error = get_swap_reader(&handle, swsusp_header.image);
+ error = get_swap_reader(&handle, swsusp_header->image);
if (!error)
error = swap_read_page(&handle, header, NULL);
if (!error)
@@ -591,17 +585,17 @@ int swsusp_check(void)
resume_bdev = open_by_devnum(swsusp_resume_device, FMODE_READ);
if (!IS_ERR(resume_bdev)) {
set_blocksize(resume_bdev, PAGE_SIZE);
- memset(&swsusp_header, 0, sizeof(swsusp_header));
+ memset(swsusp_header, 0, sizeof(PAGE_SIZE));
error = bio_read_page(swsusp_resume_block,
- &swsusp_header, NULL);
+ swsusp_header, NULL);
if (error)
return error;
- if (!memcmp(SWSUSP_SIG, swsusp_header.sig, 10)) {
- memcpy(swsusp_header.sig, swsusp_header.orig_sig, 10);
+ if (!memcmp(SWSUSP_SIG, swsusp_header->sig, 10)) {
+ memcpy(swsusp_header->sig, swsusp_header->orig_sig, 10);
/* Reset swap signature now */
error = bio_write_page(swsusp_resume_block,
- &swsusp_header, NULL);
+ swsusp_header, NULL);
} else {
return -EINVAL;
}
@@ -632,3 +626,13 @@ void swsusp_close(void)
blkdev_put(resume_bdev);
}
+
+static int swsusp_header_init(void)
+{
+ swsusp_header = (struct swsusp_header*) __get_free_page(GFP_KERNEL);
+ if (!swsusp_header)
+ panic("Could not allocate memory for swsusp_header\n");
+ return 0;
+}
+
+core_initcall(swsusp_header_init);