write_kdump_page is used to write page when generating kdump core.
It mainly optimizes the way of generating incomplete core.
Signed-off-by: Zhou Wenjian <zhouwj-fnst at cn.fujitsu.com>
---
makedumpfile.c | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 53 insertions(+)
diff --git a/makedumpfile.c b/makedumpfile.c
index e8b52f4..74bf83e 100644
--- a/makedumpfile.c
+++ b/makedumpfile.c
@@ -6324,6 +6324,59 @@ get_pfn_offset(void *buf, struct cache_data *cd_page){
}
int
+write_kdump_page(struct cache_data *cd_header, struct cache_data *cd_page,
+ struct page_desc *pd, void *page_data)
+{
+ int written_pfns_size;
+
+ /*
+ * if either cd_header or cd_page is nearly full,
+ * write the buffer cd_header into dumpfile and then write the cd_page.
+ */
+ if ( cd_header->buf_size + sizeof(pd) > cd_header->cache_size
+ || cd_page->buf_size + pd->size > cd_page->cache_size ){
+
+ if(!write_cd_buf(cd_header)) {
+ /*
+ * if enospc occurs in writing cd_header,
+ * fill the cd_header with zero and re-write it
+ * into the dumpfile.
+ */
+ memset(cd_header->buf, 0, cd_header->cache_size);
+ write_cd_buf(cd_header);
+
+ return FALSE;
+ }
+
+ if(!write_cd_buf(cd_page)) {
+ /*
+ * if enospc occurs in writing cd_page,
+ * get how many pages having been written.
+ * and fill part of cd_header with zero according to it.
+ */
+ written_pfns_size = sizeof(page_desc_t) *
+ get_pfn_offset(cd_header->buf, cd_page);
+
+ memset(cd_header->buf, 0, cd_header->cache_size);
+ cd_header->offset += written_pfns_size;
+ cd_header->buf_size -= written_pfns_size;
+ write_cd_buf(cd_header);
+
+ return FALSE;
+ }
+ cd_header->offset += cd_header->buf_size;
+ cd_page->offset += cd_page->buf_size;
+ cd_header->buf_size = 0;
+ cd_page->buf_size = 0;
+ }
+
+ write_cache(cd_header, pd, sizeof(page_desc_t));
+ write_cache(cd_page, page_data, pd->size);
+
+ return TRUE;
+}
+
+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
