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4 Commits

Author SHA1 Message Date
David Sterba
e3ada5752c btrfs-progs: sb-mod: add compat bit to the recognized fields 
Signed-off-by: David Sterba <dsterba@suse.com>
 2018-04-11 15:37:36 +02:00
David Sterba
22d39a9e0f btrfs-progs: sb-mod: add csum_type 
Let SET and GET work on superblock::csum_type.

Signed-off-by: David Sterba <dsterba@suse.com>
 2018-04-11 15:37:36 +02:00
David Sterba
b5e0ca64a4 btrfs-progs: sb-mod: add preliminary support for non-u64 types 
Signed-off-by: David Sterba <dsterba@suse.com>
 2018-04-11 15:37:36 +02:00
David Sterba
d04d25fb14 btrfs-progs: add tool to edit super blocks 
$ make btrfs-sb-mod
$ ./btrfs-sb-mod image field1 operation1 ...

Fields (only u64 supported for now):
 * total_bytes
 * root
 * generation
 * chunk_root
 * chunk_root_generation
 * cache_generation
 * uuid_tree_generation

Operations:
 * read value		?0
 * set value		=NUMBER
 * add to		+NUMBER
 * subtract from value	-NUMBER
 * xor with value	^NUMBER
 * byteswap (u64)	@0

Use with care!

Signed-off-by: David Sterba <dsterba@suse.com>
 2018-03-30 22:15:55 +02:00