[PATCH 3/3][Resend] swsusp: rework swsusp_suspend
From: Rafael J. Wysocki
Date: Mon Nov 07 2005 - 18:00:52 EST
This patch makes only the functions in swsusp.c call functions in
snapshot.c and not both ways. It also moves the check for available swap
out of swsusp_suspend() which is necessary for separating the swap-handling
functions in swsusp from the core code.
Signed-off-by: Rafael J. Wysocki <rjw@xxxxxxx>
kernel/power/power.h | 2 -
kernel/power/snapshot.c | 19 +-----------
kernel/power/swsusp.c | 75 ++++++++++++++++++++++++++++--------------------
3 files changed, 47 insertions(+), 49 deletions(-)
Index: linux-2.6.14-mm1/kernel/power/snapshot.c
===================================================================
--- linux-2.6.14-mm1.orig/kernel/power/snapshot.c 2005-11-07 22:56:05.000000000 +0100
+++ linux-2.6.14-mm1/kernel/power/snapshot.c 2005-11-07 22:58:02.000000000 +0100
@@ -88,8 +88,7 @@
return 0;
}
-
-static int save_highmem(void)
+int save_highmem(void)
{
struct zone *zone;
int res = 0;
@@ -120,11 +119,7 @@
}
return 0;
}
-#else
-static int save_highmem(void) { return 0; }
-int restore_highmem(void) { return 0; }
-#endif /* CONFIG_HIGHMEM */
-
+#endif
static int pfn_is_nosave(unsigned long pfn)
{
@@ -416,11 +411,6 @@
unsigned int nr_pages;
pr_debug("swsusp: critical section: \n");
- if (save_highmem()) {
- printk(KERN_CRIT "swsusp: Not enough free pages for highmem\n");
- restore_highmem();
- return -ENOMEM;
- }
drain_local_pages();
nr_pages = count_data_pages();
@@ -440,11 +430,6 @@
return -ENOMEM;
}
- if (!enough_swap(nr_pages)) {
- printk(KERN_ERR "swsusp: Not enough free swap\n");
- return -ENOSPC;
- }
-
pagedir_nosave = swsusp_alloc(nr_pages);
if (!pagedir_nosave)
return -ENOMEM;
Index: linux-2.6.14-mm1/kernel/power/swsusp.c
===================================================================
--- linux-2.6.14-mm1.orig/kernel/power/swsusp.c 2005-11-07 22:56:05.000000000 +0100
+++ linux-2.6.14-mm1/kernel/power/swsusp.c 2005-11-07 22:58:02.000000000 +0100
@@ -73,6 +73,14 @@
#include "power.h"
+#ifdef CONFIG_HIGHMEM
+int save_highmem(void);
+int restore_highmem(void);
+#else
+static int save_highmem(void) { return 0; }
+static int restore_highmem(void) { return 0; }
+#endif
+
#define CIPHER "aes"
#define MAXKEY 32
#define MAXIV 32
@@ -500,6 +508,26 @@
}
/**
+ * enough_swap - Make sure we have enough swap to save the image.
+ *
+ * Returns TRUE or FALSE after checking the total amount of swap
+ * space avaiable.
+ *
+ * FIXME: si_swapinfo(&i) returns all swap devices information.
+ * We should only consider resume_device.
+ */
+
+static int enough_swap(unsigned int nr_pages)
+{
+ struct sysinfo i;
+
+ si_swapinfo(&i);
+ pr_debug("swsusp: available swap: %lu pages\n", i.freeswap);
+ return i.freeswap > (nr_pages + PAGES_FOR_IO +
+ (nr_pages + PBES_PER_PAGE - 1) / PBES_PER_PAGE);
+}
+
+/**
* write_suspend_image - Write entire image and metadata.
*
*/
@@ -507,6 +535,11 @@
{
int error;
+ if (!enough_swap(nr_copy_pages)) {
+ printk(KERN_ERR "swsusp: Not enough free swap\n");
+ return -ENOSPC;
+ }
+
init_header();
if ((error = data_write()))
goto FreeData;
@@ -526,27 +559,6 @@
goto Done;
}
-/**
- * enough_swap - Make sure we have enough swap to save the image.
- *
- * Returns TRUE or FALSE after checking the total amount of swap
- * space avaiable.
- *
- * FIXME: si_swapinfo(&i) returns all swap devices information.
- * We should only consider resume_device.
- */
-
-int enough_swap(unsigned int nr_pages)
-{
- struct sysinfo i;
-
- si_swapinfo(&i);
- pr_debug("swsusp: available swap: %lu pages\n", i.freeswap);
- return i.freeswap > (nr_pages + PAGES_FOR_IO +
- (nr_pages + PBES_PER_PAGE - 1) / PBES_PER_PAGE);
-}
-
-
/* It is important _NOT_ to umount filesystems at this point. We want
* them synced (in case something goes wrong) but we DO not want to mark
* filesystem clean: it is not. (And it does not matter, if we resume
@@ -556,12 +568,15 @@
{
int error;
+ if ((error = swsusp_swap_check())) {
+ printk(KERN_ERR "swsusp: cannot find swap device, try swapon -a.\n");
+ return error;
+ }
lock_swapdevices();
error = write_suspend_image();
/* This will unlock ignored swap devices since writing is finished */
lock_swapdevices();
return error;
-
}
@@ -569,6 +584,7 @@
int swsusp_suspend(void)
{
int error;
+
if ((error = arch_prepare_suspend()))
return error;
local_irq_disable();
@@ -580,15 +596,12 @@
*/
if ((error = device_power_down(PMSG_FREEZE))) {
printk(KERN_ERR "Some devices failed to power down, aborting suspend\n");
- local_irq_enable();
- return error;
+ goto Enable_irqs;
}
- if ((error = swsusp_swap_check())) {
- printk(KERN_ERR "swsusp: cannot find swap device, try swapon -a.\n");
- device_power_up();
- local_irq_enable();
- return error;
+ if ((error = save_highmem())) {
+ printk(KERN_ERR "swsusp: Not enough free pages for highmem\n");
+ goto Restore_highmem;
}
save_processor_state();
@@ -596,8 +609,10 @@
printk(KERN_ERR "Error %d suspending\n", error);
/* Restore control flow magically appears here */
restore_processor_state();
+Restore_highmem:
restore_highmem();
device_power_up();
+Enable_irqs:
local_irq_enable();
return error;
}
@@ -804,7 +819,7 @@
* Reset swap signature now.
*/
error = bio_write_page(0, &swsusp_header);
- } else {
+ } else {
return -EINVAL;
}
if (!error)
Index: linux-2.6.14-mm1/kernel/power/power.h
===================================================================
--- linux-2.6.14-mm1.orig/kernel/power/power.h 2005-11-07 22:56:05.000000000 +0100
+++ linux-2.6.14-mm1/kernel/power/power.h 2005-11-07 22:58:02.000000000 +0100
@@ -65,10 +65,8 @@
extern asmlinkage int swsusp_arch_suspend(void);
extern asmlinkage int swsusp_arch_resume(void);
-extern int restore_highmem(void);
extern void free_pagedir(struct pbe *pblist);
extern struct pbe *alloc_pagedir(unsigned nr_pages, gfp_t gfp_mask, int safe_needed);
extern void create_pbe_list(struct pbe *pblist, unsigned nr_pages);
extern void swsusp_free(void);
extern int alloc_data_pages(struct pbe *pblist, gfp_t gfp_mask, int safe_needed);
-extern int enough_swap(unsigned nr_pages);
-
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