[RFC PATCH v2 5/10] Add function to get num_dumpable for cyclic processing.

[Atsushi Kumagai]

get_num_dumpable_cyclic() gets the number of dumpable pages with cyclic processing.
This function is used to get info->num_dumpable and it is necessary to decide
the offset of kdump-compressed page data.

Signed-off-by: Atsushi Kumagai <kumagai-atsushi at mxc.nes.nec.co.jp>
---
 makedumpfile.c |   17 +++++++++++++++++
 makedumpfile.h |    6 ++++++
 2 files changed, 23 insertions(+)

diff --git a/makedumpfile.c b/makedumpfile.c
index 67b3499..30857e3 100644
--- a/makedumpfile.c
+++ b/makedumpfile.c
@@ -4094,6 +4094,8 @@ create_dump_bitmap(void)
 	if (info->flag_cyclic) {
 		if (!prepare_bitmap_buffer_cyclic())
 			goto out;
+
+		info->num_dumpable = get_num_dumpable_cyclic();
 	} else {
 		if (!prepare_bitmap_buffer())
 			goto out;
@@ -4555,6 +4557,21 @@ get_num_dumpable(void)
 	return num_dumpable;
 }
 
+unsigned long long
+get_num_dumpable_cyclic(void)
+{
+	unsigned long long pfn, num_dumpable=0;
+
+	for (pfn = 0; pfn < info->max_mapnr; pfn++) {
+		if (!update_cyclic_region(pfn))
+			return FALSE;
+
+		if (is_dumpable_cyclic(info->partial_bitmap2, pfn))
+			num_dumpable++;
+	}
+
+	return num_dumpable;
+}
 
 int
 write_elf_load_segment(struct cache_data *cd_page, unsigned long long paddr,
diff --git a/makedumpfile.h b/makedumpfile.h
index 1a49aa2..e336814 100644
--- a/makedumpfile.h
+++ b/makedumpfile.h
@@ -938,6 +938,7 @@ struct DumpInfo {
 	char               *partial_bitmap2;
 	unsigned long long cyclic_start_pfn;
 	unsigned long long cyclic_end_pfn;  
+	unsigned long long num_dumpable;
 
 	/*
 	 * sadump info:
@@ -1511,4 +1512,9 @@ struct elf_prstatus {
 
 #endif
 
+/*
+ * Function Prototype.
+ */
+unsigned long long get_num_dumpable_cyclic(void);
+
 #endif /* MAKEDUMPFILE_H */
-- 
1.7.9.2