Parse a signature. It may reflect a normal swapheader of type 1 or 2, a
swsusp header or a Suspend2 header.
Signed-off-by: Nigel Cunningham <[email protected]>
kernel/power/suspend_swap.c | 50 +++++++++++++++++++++++++++++++++++++++++++
1 files changed, 50 insertions(+), 0 deletions(-)
diff --git a/kernel/power/suspend_swap.c b/kernel/power/suspend_swap.c
index a014103..08c4f86 100644
--- a/kernel/power/suspend_swap.c
+++ b/kernel/power/suspend_swap.c
@@ -243,3 +243,53 @@ static void swapwriter_noresume_reset(vo
close_bdevs();
}
+static int parse_signature(char *header, int restore)
+{
+ int type = -1;
+
+ if (!memcmp("SWAP-SPACE",header,10))
+ return 0;
+ else if (!memcmp("SWAPSPACE2",header,10))
+ return 1;
+
+ else if (!memcmp("S1SUSP",header,6))
+ type = 4;
+ else if (!memcmp("S2SUSP",header,6))
+ type = 5;
+
+ else if (!memcmp("z",header,1))
+ type = 12;
+ else if (!memcmp("Z",header,1))
+ type = 13;
+
+ /*
+ * Put bdev of suspend header in last byte of swap header
+ * (unsigned short)
+ */
+ if (type > 11) {
+ dev_t *header_ptr = (dev_t *) &header[1];
+ unsigned char *headerblocksize_ptr =
+ (unsigned char *) &header[5];
+ u32 *headerblock_ptr = (u32 *) &header[6];
+ header_dev_t = *header_ptr;
+ /*
+ * We are now using the highest bit of the char to indicate
+ * whether we have attempted to resume from this image before.
+ */
+ clear_suspend_state(SUSPEND_RESUMED_BEFORE);
+ if (((int) *headerblocksize_ptr) & 0x80)
+ set_suspend_state(SUSPEND_RESUMED_BEFORE);
+ headerblock = (unsigned long) *headerblock_ptr;
+ }
+
+ if ((restore) && (type > 5)) {
+ /* We only reset our own signatures */
+ if (type & 1)
+ memcpy(header,"SWAPSPACE2",10);
+ else
+ memcpy(header,"SWAP-SPACE",10);
+ }
+
+ return type;
+}
+
--
Nigel Cunningham nigel at suspend2 dot net
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