From 355064675f1c997cea017ea64c8f2c216e5425d9 Mon Sep 17 00:00:00 2001 From: Mario Limonciello Date: Wed, 28 Mar 2018 12:01:09 -0500 Subject: PM / hibernate: Make passing hibernate offsets more friendly Currently the only way to specify a hibernate offset for a swap file is on the kernel command line. Add a new /sys/power/resume_offset that lets userspace specify the offset and disk to use when initiating a hibernate cycle. Signed-off-by: Mario Limonciello Signed-off-by: Rafael J. Wysocki --- kernel/power/hibernate.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) (limited to 'kernel/power') diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c index a5c36e9..d58fad3 100644 --- a/kernel/power/hibernate.c +++ b/kernel/power/hibernate.c @@ -1061,6 +1061,29 @@ static ssize_t resume_store(struct kobject *kobj, struct kobj_attribute *attr, power_attr(resume); +static ssize_t resume_offset_show(struct kobject *kobj, + struct kobj_attribute *attr, char *buf) +{ + return sprintf(buf, "%llu\n", (unsigned long long)swsusp_resume_block); +} + +static ssize_t resume_offset_store(struct kobject *kobj, + struct kobj_attribute *attr, const char *buf, + size_t n) +{ + unsigned long long offset; + int rc; + + rc = kstrtoull(buf, 0, &offset); + if (rc) + return rc; + swsusp_resume_block = offset; + + return n; +} + +power_attr(resume_offset); + static ssize_t image_size_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { @@ -1106,6 +1129,7 @@ power_attr(reserved_size); static struct attribute * g[] = { &disk_attr.attr, + &resume_offset_attr.attr, &resume_attr.attr, &image_size_attr.attr, &reserved_size_attr.attr, -- cgit v1.1