[Suspend2][ 15/35] [Suspend2] Allocate filewriter storage.

[Nigel Cunningham <nigel@suspend2.net>]

Allocate storage for the body of the image, preserving any existing
allocation for the header. This routine will never shrink the amount
allocated.

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

 kernel/power/suspend_file.c |   32 ++++++++++++++++++++++++++++++++
 1 files changed, 32 insertions(+), 0 deletions(-)

diff --git a/kernel/power/suspend_file.c b/kernel/power/suspend_file.c
index 6b04eb5..cdc0261 100644
--- a/kernel/power/suspend_file.c
+++ b/kernel/power/suspend_file.c
@@ -448,3 +448,35 @@ static int filewriter_allocate_header_sp
 	return 0;
 }
 
+static int filewriter_allocate_storage(int space_requested)
+{
+	int result = 0, prev_header_pages;
+	int blocks_to_get = (space_requested << devinfo.bmap_shift) -
+		block_chain.size;
+	
+	/* Only release_storage reduces the size */
+	if (blocks_to_get < 1)
+		return 0;
+
+	main_pages = space_requested;
+
+	populate_block_list();
+
+	suspend_message(SUSPEND_WRITER, SUSPEND_MEDIUM, 0,
+		"Finished with block_chain.size == %d.\n",
+		block_chain.size);
+
+	if (block_chain.size < (header_pages + main_pages)) {
+		printk("Block chain size (%d) < header pages (%d) + main pages (%d) (=%d).\n",
+				block_chain.size,
+				header_pages, main_pages,
+				header_pages + main_pages);
+		result = -ENOSPC;
+	}
+
+	prev_header_pages = header_pages;
+	header_pages = 0;
+	filewriter_allocate_header_space(prev_header_pages);
+	return result;
+}
+

--
Nigel Cunningham		nigel at suspend2 dot net
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