[PATCH v1 2/4] Add get_pfn_offset

[Zhou Wenjian]

get_pfn_offset is used for generating incomplete kdump core.
When enospac occurs in writing the buf cd_page, it can be used to
get how many pages have been written.

Signed-off-by: Zhou Wenjian <zhouwj-fnst at cn.fujitsu.com>
---
 makedumpfile.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/makedumpfile.c b/makedumpfile.c
index 5a53246..e8b52f4 100644
--- a/makedumpfile.c
+++ b/makedumpfile.c
@@ -6300,6 +6300,30 @@ write_cd_buf(struct cache_data *cd)
 }
 
 int
+get_pfn_offset(void *buf, struct cache_data *cd_page){
+	int size, file_end, offset;
+	page_desc_t *pd;
+
+	size = 0;
+	offset = 0;
+	file_end = lseek(cd_page->fd, 0, SEEK_END);
+	if (file_end < 0)
+		ERRMSG("Can't seek end of the dump file(%s).\n", cd_page->file_name);
+
+	while (TRUE) {
+		pd = (page_desc_t *)buf;
+		size += pd->size;
+		if (size > file_end - cd_page->offset)
+			break;
+
+		offset++;
+		buf += sizeof(page_desc_t);
+	}
+
+	return offset;
+}
+
+int
 write_kdump_pages_cyclic(struct cache_data *cd_header, struct cache_data *cd_page,
 			 struct page_desc *pd_zero, off_t *offset_data, struct cycle *cycle)
 {
-- 
1.8.3.1