[Qemu-devel] [PATCH v5 4/9] dump: Add API to write elf notes to buffer

[Qiao Nuohan <qiaonuohan@cn.fujitsu.com>]

the function can be used by write_elf32_notes/write_elf64_notes. If
fd_write_vmcore is called by write_elf32_notes/write_elf64_notes, elf notes will
be written to vmcore by fd_write_vmcore directly. Instead, buf_write_note will
write elf notes to opaque->note_buf. And the elf notes stored in
opaque->note_buf will be used later.

Signed-off-by: Qiao Nuohan <qiaonuohan@cn.fujitsu.com>
Reviewed-by: Zhang Xiaohe <zhangxh@cn.fujitsu.com>
---
 dump.c |   19 +++++++++++++++++++
 1 files changed, 19 insertions(+), 0 deletions(-)

diff --git a/dump.c b/dump.c
index 6f14b8d..d7b3624 100644
--- a/dump.c
+++ b/dump.c
@@ -75,6 +75,9 @@ typedef struct DumpState {
     int64_t begin;
     int64_t length;
     Error **errp;
+
+    void *note_buf;
+    size_t note_buf_offset;
 } DumpState;
 
 static int dump_cleanup(DumpState *s)
@@ -742,6 +745,22 @@ static int write_buffer(int fd, bool flag_flatten, off_t offset, void *buf,
     return 0;
 }
 
+static int buf_write_note(void *buf, size_t size, void *opaque)
+{
+    DumpState *s = opaque;
+
+    /* note_buf is not enough */
+    if (s->note_buf_offset + size > s->note_size) {
+        return -1;
+    }
+
+    memcpy(s->note_buf + s->note_buf_offset, buf, size);
+
+    s->note_buf_offset += size;
+
+    return 0;
+}
+
 static ram_addr_t get_start_block(DumpState *s)
 {
     RAMBlock *block;
-- 
1.7.1