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// SPDX-License-Identifier: GPL-2.0+
/*
* BTRFS filesystem implementation for U-Boot
*
* 2017 Marek Behun, CZ.NIC, marek.behun@nic.cz
*/
#include <config.h>
#include <malloc.h>
#include <uuid.h>
#include <linux/time.h>
#include "btrfs.h"
#include "crypto/hash.h"
#include "disk-io.h"
struct btrfs_info btrfs_info;
static int readdir_callback(const struct __btrfs_root *root,
struct btrfs_dir_item *item)
{
static const char typestr[BTRFS_FT_MAX][4] = {
[BTRFS_FT_UNKNOWN] = " ? ",
[BTRFS_FT_REG_FILE] = " ",
[BTRFS_FT_DIR] = "DIR",
[BTRFS_FT_CHRDEV] = "CHR",
[BTRFS_FT_BLKDEV] = "BLK",
[BTRFS_FT_FIFO] = "FIF",
[BTRFS_FT_SOCK] = "SCK",
[BTRFS_FT_SYMLINK] = "SYM",
[BTRFS_FT_XATTR] = " ? ",
};
struct btrfs_inode_item inode;
const char *name = (const char *) (item + 1);
char filetime[32], *target = NULL;
time_t mtime;
if (btrfs_lookup_inode(root, (struct btrfs_key *)&item->location,
&inode, NULL)) {
printf("%s: Cannot find inode item for directory entry %.*s!\n",
__func__, item->name_len, name);
return 0;
}
mtime = inode.mtime.sec;
ctime_r(&mtime, filetime);
if (item->type == BTRFS_FT_SYMLINK) {
target = malloc(min(inode.size + 1,
(u64) btrfs_info.sb.sectorsize));
if (target && btrfs_readlink(root, item->location.objectid,
target)) {
free(target);
target = NULL;
}
if (!target)
printf("%s: Cannot read symlink target!\n", __func__);
}
printf("<%s> ", typestr[item->type]);
if (item->type == BTRFS_FT_CHRDEV || item->type == BTRFS_FT_BLKDEV)
printf("%4u,%5u ", (unsigned int) (inode.rdev >> 20),
(unsigned int) (inode.rdev & 0xfffff));
else
printf("%10llu ", inode.size);
printf("%24.24s %.*s", filetime, item->name_len, name);
if (item->type == BTRFS_FT_SYMLINK) {
printf(" -> %s", target ? target : "?");
if (target)
free(target);
}
printf("\n");
return 0;
}
int btrfs_probe(struct blk_desc *fs_dev_desc,
struct disk_partition *fs_partition)
{
btrfs_blk_desc = fs_dev_desc;
btrfs_part_info = fs_partition;
memset(&btrfs_info, 0, sizeof(btrfs_info));
btrfs_hash_init();
if (btrfs_read_superblock())
return -1;
if (btrfs_chunk_map_init()) {
printf("%s: failed to init chunk map\n", __func__);
return -1;
}
btrfs_info.tree_root.objectid = 0;
btrfs_info.tree_root.bytenr = btrfs_info.sb.root;
btrfs_info.chunk_root.objectid = 0;
btrfs_info.chunk_root.bytenr = btrfs_info.sb.chunk_root;
if (btrfs_read_chunk_tree()) {
printf("%s: failed to read chunk tree\n", __func__);
return -1;
}
if (btrfs_find_root(btrfs_get_default_subvol_objectid(),
&btrfs_info.fs_root, NULL)) {
printf("%s: failed to find default subvolume\n", __func__);
return -1;
}
return 0;
}
int btrfs_ls(const char *path)
{
struct __btrfs_root root = btrfs_info.fs_root;
u64 inr;
u8 type;
inr = btrfs_lookup_path(&root, root.root_dirid, path, &type, NULL, 40);
if (inr == -1ULL) {
printf("Cannot lookup path %s\n", path);
return -1;
}
if (type != BTRFS_FT_DIR) {
printf("Not a directory: %s\n", path);
return -1;
}
if (btrfs_readdir(&root, inr, readdir_callback)) {
printf("An error occured while listing directory %s\n", path);
return -1;
}
return 0;
}
int btrfs_exists(const char *file)
{
struct __btrfs_root root = btrfs_info.fs_root;
u64 inr;
u8 type;
inr = btrfs_lookup_path(&root, root.root_dirid, file, &type, NULL, 40);
return (inr != -1ULL && type == BTRFS_FT_REG_FILE);
}
int btrfs_size(const char *file, loff_t *size)
{
struct __btrfs_root root = btrfs_info.fs_root;
struct btrfs_inode_item inode;
u64 inr;
u8 type;
inr = btrfs_lookup_path(&root, root.root_dirid, file, &type, &inode,
40);
if (inr == -1ULL) {
printf("Cannot lookup file %s\n", file);
return -1;
}
if (type != BTRFS_FT_REG_FILE) {
printf("Not a regular file: %s\n", file);
return -1;
}
*size = inode.size;
return 0;
}
int btrfs_read(const char *file, void *buf, loff_t offset, loff_t len,
loff_t *actread)
{
struct __btrfs_root root = btrfs_info.fs_root;
struct btrfs_inode_item inode;
u64 inr, rd;
u8 type;
inr = btrfs_lookup_path(&root, root.root_dirid, file, &type, &inode,
40);
if (inr == -1ULL) {
printf("Cannot lookup file %s\n", file);
return -1;
}
if (type != BTRFS_FT_REG_FILE) {
printf("Not a regular file: %s\n", file);
return -1;
}
if (!len)
len = inode.size;
if (len > inode.size - offset)
len = inode.size - offset;
rd = btrfs_file_read(&root, inr, offset, len, buf);
if (rd == -1ULL) {
printf("An error occured while reading file %s\n", file);
return -1;
}
*actread = rd;
return 0;
}
void btrfs_close(void)
{
btrfs_chunk_map_exit();
}
int btrfs_uuid(char *uuid_str)
{
#ifdef CONFIG_LIB_UUID
uuid_bin_to_str(btrfs_info.sb.fsid, uuid_str, UUID_STR_FORMAT_STD);
return 0;
#endif
return -ENOSYS;
}
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