netdev - [RFC PATCH v3 12/12] PM / hibernate: update the resume offset on SNAPSHOT_SET_SWAP

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Message-ID: <20200212223552.GA4609@dev-dsk-anchalag-2a-9c2d1d96.us-west-2.amazon.com>
Date:   Wed, 12 Feb 2020 22:35:52 +0000
From:   Anchal Agarwal <anchalag@...zon.com>
To:     <tglx@...utronix.de>, <mingo@...hat.com>, <bp@...en8.de>,
        <hpa@...or.com>, <x86@...nel.org>, <boris.ostrovsky@...cle.com>,
        <jgross@...e.com>, <linux-pm@...r.kernel.org>,
        <linux-mm@...ck.org>, <kamatam@...zon.com>,
        <sstabellini@...nel.org>, <konrad.wilk@...cle.com>,
        <roger.pau@...rix.com>, <axboe@...nel.dk>, <davem@...emloft.net>,
        <rjw@...ysocki.net>, <len.brown@...el.com>, <pavel@....cz>,
        <peterz@...radead.org>, <eduval@...zon.com>, <sblbir@...zon.com>,
        <anchalag@...zon.com>, <xen-devel@...ts.xenproject.org>,
        <vkuznets@...hat.com>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <dwmw@...zon.co.uk>,
        <fllinden@...ozn.com>, <benh@...nel.crashing.org>
Subject: [RFC PATCH v3 12/12] PM / hibernate: update the resume offset on
 SNAPSHOT_SET_SWAP_AREA

From: Aleksei Besogonov <cyberax@...zon.com>

The SNAPSHOT_SET_SWAP_AREA is supposed to be used to set the hibernation
offset on a running kernel to enable hibernating to a swap file.
However, it doesn't actually update the swsusp_resume_block variable. As
a result, the hibernation fails at the last step (after all the data is
written out) in the validation of the swap signature in
mark_swapfiles().

Before this patch, the command line processing was the only place where
swsusp_resume_block was set.

Signed-off-by: Aleksei Besogonov <cyberax@...zon.com>
Signed-off-by: Munehisa Kamata <kamatam@...zon.com>
Signed-off-by: Anchal Agarwal <anchalag@...zon.com>

---
  Changes since V2: None
---
 kernel/power/user.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/kernel/power/user.c b/kernel/power/user.c
index 77438954cc2b..d396e313cb7b 100644
--- a/kernel/power/user.c
+++ b/kernel/power/user.c
@@ -374,8 +374,12 @@ static long snapshot_ioctl(struct file *filp, unsigned int cmd,
 			if (swdev) {
 				offset = swap_area.offset;
 				data->swap = swap_type_of(swdev, offset, NULL);
-				if (data->swap < 0)
+				if (data->swap < 0) {
 					error = -ENODEV;
+				} else {
+					swsusp_resume_device = swdev;
+					swsusp_resume_block = offset;
+				}
 			} else {
 				data->swap = -1;
 				error = -EINVAL;
-- 
2.24.1.AMZN