21a14facb1
This adds the proper implementation for the BTRFS filesystem. The implementation currently supports only read-only mode and the filesystem can be only on a single device. Checksums of data chunks is unimplemented. Compression is implemented (ZLIB + LZO). Signed-off-by: Marek Behun <marek.behun@nic.cz> create mode 100644 fs/btrfs/btrfs.h create mode 100644 fs/btrfs/chunk-map.c create mode 100644 fs/btrfs/compression.c create mode 100644 fs/btrfs/ctree.c create mode 100644 fs/btrfs/dev.c create mode 100644 fs/btrfs/dir-item.c create mode 100644 fs/btrfs/extent-io.c create mode 100644 fs/btrfs/hash.c create mode 100644 fs/btrfs/inode.c create mode 100644 fs/btrfs/root.c create mode 100644 fs/btrfs/subvolume.c create mode 100644 fs/btrfs/super.c
39 lines
693 B
C
39 lines
693 B
C
/*
|
|
* BTRFS filesystem implementation for U-Boot
|
|
*
|
|
* 2017 Marek Behun, CZ.NIC, marek.behun@nic.cz
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
#include "btrfs.h"
|
|
#include <u-boot/crc.h>
|
|
|
|
static u32 btrfs_crc32c_table[256];
|
|
|
|
void btrfs_hash_init(void)
|
|
{
|
|
static int inited = 0;
|
|
|
|
if (!inited) {
|
|
crc32c_init(btrfs_crc32c_table, 0x82F63B78);
|
|
inited = 1;
|
|
}
|
|
}
|
|
|
|
u32 btrfs_crc32c(u32 crc, const void *data, size_t length)
|
|
{
|
|
return crc32c_cal(crc, (const char *) data, length,
|
|
btrfs_crc32c_table);
|
|
}
|
|
|
|
u32 btrfs_csum_data(char *data, u32 seed, size_t len)
|
|
{
|
|
return btrfs_crc32c(seed, data, len);
|
|
}
|
|
|
|
void btrfs_csum_final(u32 crc, void *result)
|
|
{
|
|
*((u32 *) result) = cpu_to_le32(~crc);
|
|
}
|