@@ -139,6 +139,7 @@ struct sb_field {
{ .name = "log_root_level", .type = TYPE_U8 },
{ .name = "cache_generation", .type = TYPE_U64 },
{ .name = "uuid_tree_generation", .type = TYPE_U64 },
+ { .name = "devid", .type = TYPE_U64 },
};
#define MOD_FIELD_XX(fname, set, val, bits, f_dec, f_hex, f_type) \
@@ -154,11 +155,28 @@ struct sb_field {
} \
}
+#define MOD_DEV_FIELD_XX(fname, set, val, bits, f_dec, f_hex, f_type) \
+ else if (strcmp(name, #fname) == 0) { \
+ if (set) { \
+ printf("SET: "#fname" "f_dec" (0x"f_hex")\n", \
+ (f_type)*val, (f_type)*val); \
+ sb->dev_item.fname = cpu_to_le##bits(*val); \
+ } else { \
+ *val = le##bits##_to_cpu(sb->dev_item.fname); \
+ printf("GET: "#fname" "f_dec" (0x"f_hex")\n", \
+ (f_type)*val, (f_type)*val); \
+ } \
+ }
+
#define MOD_FIELD64(fname, set, val) \
MOD_FIELD_XX(fname, set, val, 64, "%llu", "%llx", unsigned long long)
+#define MOD_DEV_FIELD64(fname, set, val) \
+ MOD_DEV_FIELD_XX(fname, set, val, 64, "%llu", "%llx", unsigned long long)
+
/* Alias for u64 */
#define MOD_FIELD(fname, set, val) MOD_FIELD64(fname, set, val)
+#define MOD_DEV_FIELD(fname, set, val) MOD_DEV_FIELD64(fname, set, val)
/*
* Support only GET and SET properly, ADD and SUB may work
@@ -202,6 +220,7 @@ static void mod_field_by_name(struct btrfs_super_block *sb, int set, const char
MOD_FIELD8(log_root_level, set, val)
MOD_FIELD(cache_generation, set, val)
MOD_FIELD(uuid_tree_generation, set, val)
+ MOD_DEV_FIELD(devid, set, val)
else {
printf("ERROR: unhandled field: %s\n", name);
exit(1);
@@ -260,7 +279,8 @@ static int arg_to_op_value(const char *arg, enum field_op *op, u64 *val)
return 0;
}
-int main(int argc, char **argv) {
+int main(int argc, char **argv)
+{
int fd;
loff_t off;
int ret;
We need this patch to create a crafted image with bogus devid. For example: ./btrfs-sb-mod devid =0 Signed-off-by: Anand Jain <anand.jain@oracle.com> --- btrfs-sb-mod.c | 22 +++++++++++++++++++++- 1 file changed, 21 insertions(+), 1 deletion(-)