Invalidate an image stored on swap.
Signed-off-by: Nigel Cunningham <[email protected]>
kernel/power/suspend_swap.c | 55 +++++++++++++++++++++++++++++++++++++++++++
1 files changed, 55 insertions(+), 0 deletions(-)
diff --git a/kernel/power/suspend_swap.c b/kernel/power/suspend_swap.c
index 9d806a5..ba1761b 100644
--- a/kernel/power/suspend_swap.c
+++ b/kernel/power/suspend_swap.c
@@ -750,3 +750,58 @@ static int swapwriter_read_header_cleanu
return 0;
}
+/* swapwriter_invalidate_image
+ *
+ */
+static int swapwriter_invalidate_image(void)
+{
+ union p_diskpage cur;
+ int result = 0;
+ char newsig[11];
+
+ cur.address = get_zeroed_page(GFP_ATOMIC);
+ if (!cur.address) {
+ printk("Unable to allocate a page for restoring the swap signature.\n");
+ return -ENOMEM;
+ }
+
+ /*
+ * If nr_suspends == 0, we must be booting, so no swap pages
+ * will be recorded as used yet.
+ */
+
+ if (nr_suspends > 0)
+ swapwriter_release_storage();
+
+ /*
+ * We don't do a sanity check here: we want to restore the swap
+ * whatever version of kernel made the suspend image.
+ *
+ * We need to write swap, but swap may not be enabled so
+ * we write the device directly
+ */
+
+ suspend_bio_ops.bdev_page_io(READ, resume_block_device,
+ resume_firstblock,
+ virt_to_page(cur.pointer));
+
+ result = parse_signature(cur.pointer->swh.magic.magic, 1);
+
+ if (result < 4)
+ goto out;
+
+ strncpy(newsig, cur.pointer->swh.magic.magic, 10);
+ newsig[10] = 0;
+
+ suspend_bio_ops.bdev_page_io(WRITE, resume_block_device,
+ resume_firstblock,
+ virt_to_page(cur.pointer));
+
+ if (!nr_suspends)
+ printk(KERN_WARNING name_suspend "Image invalidated.\n");
+out:
+ suspend_bio_ops.finish_all_io();
+ free_page(cur.address);
+ return 0;
+}
+
--
Nigel Cunningham nigel at suspend2 dot net
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
