[PATCH v3 1/3] dump: support cancel dump process

[Hogan Wang]

Break saving pages or dump iterate when dump job in cancel state,
make sure dump process exits as soon as possible.

Signed-off-by: Hogan Wang <hogan.wang@huawei.com>
---
 dump/dump.c           | 23 +++++++++++++++++++++++
 include/sysemu/dump.h |  2 ++
 2 files changed, 25 insertions(+)

diff --git a/dump/dump.c b/dump/dump.c
index 4d9658ffa2..a57c580b12 100644
--- a/dump/dump.c
+++ b/dump/dump.c
@@ -54,6 +54,8 @@ static Error *dump_migration_blocker;
       DIV_ROUND_UP((name_size), 4) +                    \
       DIV_ROUND_UP((desc_size), 4)) * 4)
 
+static bool dump_cancelling(void);
+
 static inline bool dump_is_64bit(DumpState *s)
 {
     return s->dump_info.d_class == ELFCLASS64;
@@ -118,6 +120,10 @@ static int fd_write_vmcore(const void *buf, size_t size, 
void *opaque)
     DumpState *s = opaque;
     size_t written_size;
 
+    if (dump_cancelling()) {
+        return -ECANCELED;
+    }
+
     written_size = qemu_write_full(s->fd, buf, size);
     if (written_size != size) {
         return -errno;
@@ -627,6 +633,10 @@ static void dump_iterate(DumpState *s, Error **errp)
 
     do {
         block = s->next_block;
+        if (dump_cancelling()) {
+            error_setg(errp, "dump: job cancelled");
+            return;
+        }
 
         size = block->target_end - block->target_start;
         if (s->has_filter) {
@@ -1321,6 +1331,10 @@ static void write_dump_pages(DumpState *s, Error **errp)
      * first page of page section
      */
     while (get_next_page(&block_iter, &pfn_iter, &buf, s)) {
+        if (dump_cancelling()) {
+            error_setg(errp, "dump: job cancelled");
+            goto out;
+        }
         /* check zero page */
         if (buffer_is_zero(buf, s->dump_info.page_size)) {
             ret = write_cache(&page_desc, &pd_zero, sizeof(PageDescriptor),
@@ -1540,6 +1554,15 @@ bool qemu_system_dump_in_progress(void)
     return (qatomic_read(&state->status) == DUMP_STATUS_ACTIVE);
 }
 
+static bool dump_cancelling(void)
+{
+    DumpState *state = &dump_state_global;
+    if (state->job && job_is_cancelled(state->job)) {
+        return true;
+    }
+    return false;
+}
+
 /* calculate total size of memory to be dumped (taking filter into
  * acoount.) */
 static int64_t dump_calculate_size(DumpState *s)
diff --git a/include/sysemu/dump.h b/include/sysemu/dump.h
index ffc2ea1072..41bdbe595f 100644
--- a/include/sysemu/dump.h
+++ b/include/sysemu/dump.h
@@ -15,6 +15,7 @@
 #define DUMP_H
 
 #include "qapi/qapi-types-dump.h"
+#include "qemu/job.h"
 
 #define MAKEDUMPFILE_SIGNATURE      "makedumpfile"
 #define MAX_SIZE_MDF_HEADER         (4096) /* max size of makedumpfile_header 
*/
@@ -154,6 +155,7 @@ typedef struct DumpState {
     GuestPhysBlockList guest_phys_blocks;
     ArchDumpInfo dump_info;
     MemoryMappingList list;
+    Job *job;
     uint32_t phdr_num;
     uint32_t shdr_num;
     bool resume;
-- 
2.33.0