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Subject[Suspend2][ 19/35] [Suspend2] Filewriter header reading initialisation.
Date
Shared initialisation when reading a filewriter image header.

Signed-off-by: Nigel Cunningham <nigel@suspend2.net>

kernel/power/suspend_file.c | 62 +++++++++++++++++++++++++++++++++++++++++++
1 files changed, 62 insertions(+), 0 deletions(-)

diff --git a/kernel/power/suspend_file.c b/kernel/power/suspend_file.c
index 1dd082f..da50422 100644
--- a/kernel/power/suspend_file.c
+++ b/kernel/power/suspend_file.c
@@ -594,3 +594,65 @@ static int file_init(void)
return 0;
}

+/*
+ * read_header_init()
+ *
+ * Ramdisk support based heavily on init/do_mounts_rd.c
+ *
+ * Description:
+ * 1. Attempt to read the device specified with resume2=.
+ * 2. Check the contents of the header for our signature.
+ * 3. Warn, ignore, reset and/or continue as appropriate.
+ * 4. If continuing, read the filewriter configuration section
+ * of the header and set up block device info so we can read
+ * the rest of the header & image.
+ *
+ * Returns:
+ * May not return if user choose to reboot at a warning.
+ * -EINVAL if cannot resume at this time. Booting should continue
+ * normally.
+ */
+
+static int filewriter_read_header_init(void)
+{
+ int result;
+ struct block_device *tmp;
+
+ suspend_writer_buffer = (char *) get_zeroed_page(GFP_ATOMIC);
+
+ if (test_suspend_state(SUSPEND_TRY_RESUME_RD))
+ result = rd_init();
+ else
+ result = file_init();
+
+ if (result) {
+ printk("Filewriter read header init: Failed to initialise "
+ "reading the first page of data.\n");
+ return result;
+ }
+
+ memcpy(&suspend_writer_posn_save,
+ suspend_writer_buffer + suspend_writer_buffer_posn,
+ sizeof(suspend_writer_posn_save));
+
+ suspend_writer_buffer_posn += sizeof(suspend_writer_posn_save);
+
+ tmp = devinfo.bdev;
+
+ memcpy(&devinfo,
+ suspend_writer_buffer + suspend_writer_buffer_posn,
+ sizeof(devinfo));
+
+ devinfo.bdev = tmp;
+ suspend_writer_buffer_posn += sizeof(devinfo);
+
+ suspend_extent_state_goto_start(&suspend_writer_posn);
+ suspend_bio_ops.set_extra_page_forward();
+
+ suspend_header_bytes_used = suspend_writer_buffer_posn;
+
+ suspend_load_extent_chain(&block_chain);
+
+ return 0;
+}
+
--
Nigel Cunningham nigel at suspend2 dot net
-
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