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dump: add APIs to operate DataCache

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DataCache is used to store data temporarily, then the data will be written to
vmcore. These functions will be called later when writing data of page to
vmcore.

Signed-off-by: Qiao Nuohan <qiaonuohan@cn.fujitsu.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
This commit is contained in:
qiaonuohan 2014-02-18 14:11:34 +08:00 committed by Luiz Capitulino
parent d0686c7291
commit 64cfba6a47
2 changed files with 56 additions and 0 deletions
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47
dump.c
View File

@ -1165,6 +1165,53 @@ out:
return ret;
}
static void prepare_data_cache(DataCache *data_cache, DumpState *s,
off_t offset)
{
data_cache->fd = s->fd;
data_cache->data_size = 0;
data_cache->buf_size = BUFSIZE_DATA_CACHE;
data_cache->buf = g_malloc0(BUFSIZE_DATA_CACHE);
data_cache->offset = offset;
}
static int write_cache(DataCache *dc, const void *buf, size_t size,
bool flag_sync)
{
/*
* dc->buf_size should not be less than size, otherwise dc will never be
* enough
*/
assert(size <= dc->buf_size);
/*
* if flag_sync is set, synchronize data in dc->buf into vmcore.
* otherwise check if the space is enough for caching data in buf, if not,
* write the data in dc->buf to dc->fd and reset dc->buf
*/
if ((!flag_sync && dc->data_size + size > dc->buf_size) ||
(flag_sync && dc->data_size > 0)) {
if (write_buffer(dc->fd, dc->offset, dc->buf, dc->data_size) < 0) {
return -1;
}
dc->offset += dc->data_size;
dc->data_size = 0;
}
if (!flag_sync) {
memcpy(dc->buf + dc->data_size, buf, size);
dc->data_size += size;
}
return 0;
}
static void free_data_cache(DataCache *data_cache)
{
g_free(data_cache->buf);
}
static ram_addr_t get_start_block(DumpState *s)
{
GuestPhysBlock *block;

9
include/sysemu/dump.h
View File

@ -41,6 +41,7 @@
#define DISKDUMP_HEADER_BLOCKS (1)
#define BUFSIZE_BITMAP (TARGET_PAGE_SIZE)
#define PFN_BUFBITMAP (CHAR_BIT * BUFSIZE_BITMAP)
#define BUFSIZE_DATA_CACHE (TARGET_PAGE_SIZE * 4)
typedef struct ArchDumpInfo {
int d_machine; /* Architecture */
@ -142,6 +143,14 @@ typedef struct QEMU_PACKED KdumpSubHeader64 {
uint64_t max_mapnr_64; /* header_version 6 and later */
} KdumpSubHeader64;
typedef struct DataCache {
int fd; /* fd of the file where to write the cached data */
uint8_t *buf; /* buffer for cached data */
size_t buf_size; /* size of the buf */
size_t data_size; /* size of cached data in buf */
off_t offset; /* offset of the file */
} DataCache;
struct GuestPhysBlockList; /* memory_mapping.h */
int cpu_get_dump_info(ArchDumpInfo *info,
const struct GuestPhysBlockList *guest_phys_blocks);