mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-08-20 00:48:52 +09:00
![Marek Behún](/assets/img/avatar_default.png)
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
121 lines
2.3 KiB
C
121 lines
2.3 KiB
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 <malloc.h>
|
|
|
|
u64 btrfs_read_extent_inline(struct btrfs_path *path,
|
|
struct btrfs_file_extent_item *extent, u64 offset,
|
|
u64 size, char *out)
|
|
{
|
|
u32 clen, dlen, orig_size = size, res;
|
|
const char *cbuf;
|
|
char *dbuf;
|
|
const int data_off = offsetof(struct btrfs_file_extent_item,
|
|
disk_bytenr);
|
|
|
|
clen = btrfs_path_item_size(path) - data_off;
|
|
cbuf = (const char *) extent + data_off;
|
|
dlen = extent->ram_bytes;
|
|
|
|
if (offset > dlen)
|
|
return -1ULL;
|
|
|
|
if (size > dlen - offset)
|
|
size = dlen - offset;
|
|
|
|
if (extent->compression == BTRFS_COMPRESS_NONE) {
|
|
memcpy(out, cbuf + offset, size);
|
|
return size;
|
|
}
|
|
|
|
if (dlen > orig_size) {
|
|
dbuf = malloc(dlen);
|
|
if (!dbuf)
|
|
return -1ULL;
|
|
} else {
|
|
dbuf = out;
|
|
}
|
|
|
|
res = btrfs_decompress(extent->compression, cbuf, clen, dbuf, dlen);
|
|
if (res == -1 || res != dlen)
|
|
goto err;
|
|
|
|
if (dlen > orig_size) {
|
|
memcpy(out, dbuf + offset, size);
|
|
free(dbuf);
|
|
} else if (offset) {
|
|
memmove(out, dbuf + offset, size);
|
|
}
|
|
|
|
return size;
|
|
|
|
err:
|
|
if (dlen > orig_size)
|
|
free(dbuf);
|
|
return -1ULL;
|
|
}
|
|
|
|
u64 btrfs_read_extent_reg(struct btrfs_path *path,
|
|
struct btrfs_file_extent_item *extent, u64 offset,
|
|
u64 size, char *out)
|
|
{
|
|
u64 physical, clen, dlen, orig_size = size;
|
|
u32 res;
|
|
char *cbuf, *dbuf;
|
|
|
|
clen = extent->disk_num_bytes;
|
|
dlen = extent->num_bytes;
|
|
|
|
if (offset > dlen)
|
|
return -1ULL;
|
|
|
|
if (size > dlen - offset)
|
|
size = dlen - offset;
|
|
|
|
physical = btrfs_map_logical_to_physical(extent->disk_bytenr);
|
|
if (physical == -1ULL)
|
|
return -1ULL;
|
|
|
|
if (extent->compression == BTRFS_COMPRESS_NONE) {
|
|
physical += extent->offset + offset;
|
|
if (!btrfs_devread(physical, size, out))
|
|
return -1ULL;
|
|
|
|
return size;
|
|
}
|
|
|
|
cbuf = malloc(dlen > size ? clen + dlen : clen);
|
|
if (!cbuf)
|
|
return -1ULL;
|
|
|
|
if (dlen > orig_size)
|
|
dbuf = cbuf + clen;
|
|
else
|
|
dbuf = out;
|
|
|
|
if (!btrfs_devread(physical, clen, cbuf))
|
|
goto err;
|
|
|
|
res = btrfs_decompress(extent->compression, cbuf, clen, dbuf, dlen);
|
|
if (res == -1)
|
|
goto err;
|
|
|
|
if (dlen > orig_size)
|
|
memcpy(out, dbuf + offset, size);
|
|
else
|
|
memmove(out, dbuf + offset, size);
|
|
|
|
free(cbuf);
|
|
return res;
|
|
|
|
err:
|
|
free(cbuf);
|
|
return -1ULL;
|
|
}
|