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authorRafael J. Wysocki <rjw@sisk.pl>2006-12-06 20:34:12 -0800
committerLinus Torvalds <torvalds@woody.osdl.org>2006-12-07 08:39:27 -0800
commit9a154d9d95b7b9845938242f5c62505b3cab5bcd (patch)
treefd3c51434298b139671f5accd42ab112a310555c /kernel/power
parent3aef83e0ef1ffb8ea3bea97be46821a45c952173 (diff)
downloadlinux-9a154d9d95b7b9845938242f5c62505b3cab5bcd.tar.bz2
[PATCH] swsusp: add resume_offset command line parameter
Add the kernel command line parameter "resume_offset=" allowing us to specify the offset, in <PAGE_SIZE> units, from the beginning of the partition pointed to by the "resume=" parameter at which the swap header is located. This offset can be determined, for example, by an application using the FIBMAP ioctl to obtain the swap header's block number for given file. [akpm@osdl.org: we don't know what type sector_t is] Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Cc: Pavel Machek <pavel@ucw.cz> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel/power')
-rw-r--r--kernel/power/disk.c15
-rw-r--r--kernel/power/power.h1
-rw-r--r--kernel/power/swap.c15
3 files changed, 26 insertions, 5 deletions
diff --git a/kernel/power/disk.c b/kernel/power/disk.c
index b1fb7866b0b3..d79feeb45459 100644
--- a/kernel/power/disk.c
+++ b/kernel/power/disk.c
@@ -27,6 +27,7 @@
static int noresume = 0;
char resume_file[256] = CONFIG_PM_STD_PARTITION;
dev_t swsusp_resume_device;
+sector_t swsusp_resume_block;
/**
* power_down - Shut machine down for hibernate.
@@ -423,6 +424,19 @@ static int __init resume_setup(char *str)
return 1;
}
+static int __init resume_offset_setup(char *str)
+{
+ unsigned long long offset;
+
+ if (noresume)
+ return 1;
+
+ if (sscanf(str, "%llu", &offset) == 1)
+ swsusp_resume_block = offset;
+
+ return 1;
+}
+
static int __init noresume_setup(char *str)
{
noresume = 1;
@@ -430,4 +444,5 @@ static int __init noresume_setup(char *str)
}
__setup("noresume", noresume_setup);
+__setup("resume_offset=", resume_offset_setup);
__setup("resume=", resume_setup);
diff --git a/kernel/power/power.h b/kernel/power/power.h
index 210ebba26020..adaf7d4fbdaf 100644
--- a/kernel/power/power.h
+++ b/kernel/power/power.h
@@ -42,6 +42,7 @@ extern const void __nosave_begin, __nosave_end;
extern unsigned long image_size;
extern int in_suspend;
extern dev_t swsusp_resume_device;
+extern sector_t swsusp_resume_block;
extern asmlinkage int swsusp_arch_suspend(void);
extern asmlinkage int swsusp_arch_resume(void);
diff --git a/kernel/power/swap.c b/kernel/power/swap.c
index 1b08f46bbb7e..aa5a9bff01f1 100644
--- a/kernel/power/swap.c
+++ b/kernel/power/swap.c
@@ -161,13 +161,14 @@ static int mark_swapfiles(sector_t start)
{
int error;
- bio_read_page(0, &swsusp_header, NULL);
+ 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(0, &swsusp_header, NULL);
+ error = bio_write_page(swsusp_resume_block,
+ &swsusp_header, NULL);
} else {
printk(KERN_ERR "swsusp: Swap header not found!\n");
error = -ENODEV;
@@ -184,7 +185,7 @@ static int swsusp_swap_check(void) /* This is called before saving image */
{
int res;
- res = swap_type_of(swsusp_resume_device, 0);
+ res = swap_type_of(swsusp_resume_device, swsusp_resume_block);
if (res < 0)
return res;
@@ -610,12 +611,16 @@ 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, NULL)))
+ error = bio_read_page(swsusp_resume_block,
+ &swsusp_header, NULL);
+ if (error)
return error;
+
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(0, &swsusp_header, NULL);
+ error = bio_write_page(swsusp_resume_block,
+ &swsusp_header, NULL);
} else {
return -EINVAL;
}