On images with some damage and mismatching checksum the read operations
will fixup the checksum. This may not be desired and does not make much
sense for read anyway.
Signed-off-by: David Sterba <dsterba@suse.com>
For passing authentication keys to the checksumming functions we need a
container for the key.
Pass in a btrfs_fs_info to btrfs_csum_data() so we can use the fs_info
as a container for the authentication key.
Note this is not always possible for all callers of btrfs_csum_data() so
we're just passing in NULL for now
Functions calling btrfs_csum_data() with a NULL fs_info argument are
currently not supported in the context of an authenticated file system.
Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: David Sterba <dsterba@suse.com>
Add helpers and all remaining members of the device item embedded in the
superblock. No UUID types.
Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
For parity with output of 'btrfs inspect dump-super', add the
"dev_item." prefix to the devid member. This allows adding more
members without conflicts (like it would be for device total_bytes).
Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
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>
Signed-off-by: David Sterba <dsterba@suse.com>
With the introduction of xxhash64 to btrfs-progs we created a crypto/
directory for all the hashes used in btrfs (although no
cryptographically secure hash is there yet).
Move the crc32c implementation from kernel-lib/ to crypto/ as well so we
have all hashes consolidated.
Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: David Sterba <dsterba@suse.com>
Fix compiler warnings and errors in btrfs-sb-mod due to incorrect
conversion with the checksum updates.
Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: David Sterba <dsterba@suse.com>
Update the checksumming API to be able to cope with more checksum types
than just CRC32C. The finalization call is merged into btrfs_csum_data.
There are some fixme's and asserts added that need to be resolved.
Co-developed-by: David Sterba <dsterba@suse.com>
Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: David Sterba <dsterba@suse.com>
update_block_csum() in btrfs-sb-mod.c is always called with the 'is_sb'
argument set to 1.
Get rid of the special case for is_sb == 0.
Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
In preparation to supporting new checksum algorithm pass the checksum type
to btrfs_csum_data/btrfs_csum_final, this allows us to encapsulate any
differences in processing into the respective functions
Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: David Sterba <dsterba@suse.com>
Pass pointer to a generic buffer instead of fixed size that crc32c
currently uses.
Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: David Sterba <dsterba@suse.com>
Add support for changing all integer items in the superblock. Sort them
in the order of defintion in the structure.
Signed-off-by: David Sterba <dsterba@suse.com>
The field type bit width is now only used to describe the members, but
let's add all of the integer ones.
Signed-off-by: David Sterba <dsterba@suse.com>
$ 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>
David Sterba
Johannes Thumshirn
Anand Jain