block/backup: add 'always' bitmap sync policy

[qemu.git] / block / bochs.c

diff --git a/block/bochs.c b/block/bochs.c
index 7dd2ac4f515f9bd7b630156737d98d230e9b8fc7..962f18592d67438c6ee3a8df9af2657bbd6f591a 100644 (file)
--- a/block/bochs.c
+++ b/block/bochs.c
@@ -24,10 +24,10 @@
  */
 #include "qemu/osdep.h"
 #include "qapi/error.h"
-#include "qemu-common.h"
 #include "block/block_int.h"
 #include "qemu/module.h"
 #include "qemu/bswap.h"
+#include "qemu/error-report.h"
 
 /**************************************************************/
 
@@ -84,14 +84,14 @@ static int bochs_probe(const uint8_t *buf, int buf_size, const char *filename)
     const struct bochs_header *bochs = (const void *)buf;
 
     if (buf_size < HEADER_SIZE)
-       return 0;
+        return 0;
 
     if (!strcmp(bochs->magic, HEADER_MAGIC) &&
-       !strcmp(bochs->type, REDOLOG_TYPE) &&
-       !strcmp(bochs->subtype, GROWING_TYPE) &&
-       ((le32_to_cpu(bochs->version) == HEADER_VERSION) ||
-       (le32_to_cpu(bochs->version) == HEADER_V1)))
-       return 100;
+        !strcmp(bochs->type, REDOLOG_TYPE) &&
+        !strcmp(bochs->subtype, GROWING_TYPE) &&
+        ((le32_to_cpu(bochs->version) == HEADER_VERSION) ||
+        (le32_to_cpu(bochs->version) == HEADER_V1)))
+        return 100;
 
     return 0;
 }
@@ -104,14 +104,18 @@ static int bochs_open(BlockDriverState *bs, QDict *options, int flags,
     struct bochs_header bochs;
     int ret;
 
+    /* No write support yet */
+    ret = bdrv_apply_auto_read_only(bs, NULL, errp);
+    if (ret < 0) {
+        return ret;
+    }
+
     bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file,
                                false, errp);
     if (!bs->file) {
         return -EINVAL;
     }
 
-    bs->read_only = true; /* no write support yet */
-
     ret = bdrv_pread(bs->file, 0, &bochs, sizeof(bochs));
     if (ret < 0) {
         return ret;
@@ -120,8 +124,8 @@ static int bochs_open(BlockDriverState *bs, QDict *options, int flags,
     if (strcmp(bochs.magic, HEADER_MAGIC) ||
         strcmp(bochs.type, REDOLOG_TYPE) ||
         strcmp(bochs.subtype, GROWING_TYPE) ||
-       ((le32_to_cpu(bochs.version) != HEADER_VERSION) &&
-       (le32_to_cpu(bochs.version) != HEADER_V1))) {
+        ((le32_to_cpu(bochs.version) != HEADER_VERSION) &&
+        (le32_to_cpu(bochs.version) != HEADER_V1))) {
         error_setg(errp, "Image not in Bochs format");
         return -EINVAL;
     }
@@ -153,7 +157,7 @@ static int bochs_open(BlockDriverState *bs, QDict *options, int flags,
     }
 
     for (i = 0; i < s->catalog_size; i++)
-       le32_to_cpus(&s->catalog_bitmap[i]);
+        le32_to_cpus(&s->catalog_bitmap[i]);
 
     s->data_offset = le32_to_cpu(bochs.header) + (s->catalog_size * 4);
 
@@ -212,7 +216,7 @@ static int64_t seek_to_sector(BlockDriverState *bs, int64_t sector_num)
     extent_offset = (offset % s->extent_size) / 512;
 
     if (s->catalog_bitmap[extent_index] == 0xffffffff) {
-       return 0; /* not allocated */
+        return 0; /* not allocated */
     }
 
     bitmap_offset = s->data_offset +
@@ -227,7 +231,7 @@ static int64_t seek_to_sector(BlockDriverState *bs, int64_t sector_num)
     }
 
     if (!((bitmap_entry >> (extent_offset % 8)) & 1)) {
-       return 0; /* not allocated */
+        return 0; /* not allocated */
     }
 
     return bitmap_offset + (512 * (s->bitmap_blocks + extent_offset));
@@ -293,6 +297,7 @@ static BlockDriver bdrv_bochs = {
     .instance_size     = sizeof(BDRVBochsState),
     .bdrv_probe                = bochs_probe,
     .bdrv_open         = bochs_open,
+    .bdrv_child_perm     = bdrv_format_default_perms,
     .bdrv_refresh_limits = bochs_refresh_limits,
     .bdrv_co_preadv = bochs_co_preadv,
     .bdrv_close                = bochs_close,