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https://github.com/brain-hackers/u-boot-brain
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![Marek Behún](/assets/img/avatar_default.png)
Signed-off-by: Marek Behun <marek.behun@nic.cz> create mode 100644 fs/btrfs/Kconfig create mode 100644 fs/btrfs/Makefile create mode 100644 fs/btrfs/btrfs.c create mode 100644 include/btrfs.h
228 lines
4.7 KiB
C
228 lines
4.7 KiB
C
/*
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* BTRFS filesystem implementation for U-Boot
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*
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* 2017 Marek Behun, CZ.NIC, marek.behun@nic.cz
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include "btrfs.h"
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#include <config.h>
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#include <malloc.h>
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#include <linux/time.h>
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struct btrfs_info btrfs_info;
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static int readdir_callback(const struct btrfs_root *root,
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struct btrfs_dir_item *item)
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{
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static const char typestr[BTRFS_FT_MAX][4] = {
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[BTRFS_FT_UNKNOWN] = " ? ",
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[BTRFS_FT_REG_FILE] = " ",
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[BTRFS_FT_DIR] = "DIR",
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[BTRFS_FT_CHRDEV] = "CHR",
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[BTRFS_FT_BLKDEV] = "BLK",
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[BTRFS_FT_FIFO] = "FIF",
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[BTRFS_FT_SOCK] = "SCK",
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[BTRFS_FT_SYMLINK] = "SYM",
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[BTRFS_FT_XATTR] = " ? ",
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};
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struct btrfs_inode_item inode;
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const char *name = (const char *) (item + 1);
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char filetime[32], *target = NULL;
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time_t mtime;
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if (btrfs_lookup_inode(root, &item->location, &inode, NULL)) {
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printf("%s: Cannot find inode item for directory entry %.*s!\n",
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__func__, item->name_len, name);
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return 0;
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}
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mtime = inode.mtime.sec;
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ctime_r(&mtime, filetime);
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if (item->type == BTRFS_FT_SYMLINK) {
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target = malloc(min(inode.size + 1,
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(u64) btrfs_info.sb.sectorsize));
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if (target && btrfs_readlink(root, item->location.objectid,
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target)) {
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free(target);
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target = NULL;
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}
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if (!target)
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printf("%s: Cannot read symlink target!\n", __func__);
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}
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printf("<%s> ", typestr[item->type]);
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if (item->type == BTRFS_FT_CHRDEV || item->type == BTRFS_FT_BLKDEV)
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printf("%4u,%5u ", (unsigned int) (inode.rdev >> 20),
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(unsigned int) (inode.rdev & 0xfffff));
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else
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printf("%10llu ", inode.size);
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printf("%24.24s %.*s", filetime, item->name_len, name);
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if (item->type == BTRFS_FT_SYMLINK) {
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printf(" -> %s", target ? target : "?");
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if (target)
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free(target);
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}
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printf("\n");
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return 0;
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}
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int btrfs_probe(struct blk_desc *fs_dev_desc, disk_partition_t *fs_partition)
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{
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btrfs_blk_desc = fs_dev_desc;
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btrfs_part_info = fs_partition;
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memset(&btrfs_info, 0, sizeof(btrfs_info));
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btrfs_hash_init();
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if (btrfs_read_superblock())
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return -1;
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if (btrfs_chunk_map_init()) {
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printf("%s: failed to init chunk map\n", __func__);
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return -1;
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}
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btrfs_info.tree_root.objectid = 0;
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btrfs_info.tree_root.bytenr = btrfs_info.sb.root;
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btrfs_info.chunk_root.objectid = 0;
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btrfs_info.chunk_root.bytenr = btrfs_info.sb.chunk_root;
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if (btrfs_read_chunk_tree()) {
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printf("%s: failed to read chunk tree\n", __func__);
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return -1;
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}
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if (btrfs_find_root(btrfs_get_default_subvol_objectid(),
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&btrfs_info.fs_root, NULL)) {
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printf("%s: failed to find default subvolume\n", __func__);
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return -1;
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}
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return 0;
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}
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int btrfs_ls(const char *path)
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{
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struct btrfs_root root = btrfs_info.fs_root;
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u64 inr;
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u8 type;
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inr = btrfs_lookup_path(&root, root.root_dirid, path, &type, NULL, 40);
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if (inr == -1ULL) {
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printf("Cannot lookup path %s\n", path);
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return 1;
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}
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if (type != BTRFS_FT_DIR) {
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printf("Not a directory: %s\n", path);
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return 1;
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}
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if (btrfs_readdir(&root, inr, readdir_callback)) {
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printf("An error occured while listing directory %s\n", path);
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return 1;
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}
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return 0;
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}
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int btrfs_exists(const char *file)
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{
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struct btrfs_root root = btrfs_info.fs_root;
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u64 inr;
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u8 type;
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inr = btrfs_lookup_path(&root, root.root_dirid, file, &type, NULL, 40);
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return (inr != -1ULL && type == BTRFS_FT_REG_FILE);
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}
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int btrfs_size(const char *file, loff_t *size)
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{
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struct btrfs_root root = btrfs_info.fs_root;
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struct btrfs_inode_item inode;
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u64 inr;
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u8 type;
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inr = btrfs_lookup_path(&root, root.root_dirid, file, &type, &inode,
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40);
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if (inr == -1ULL) {
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printf("Cannot lookup file %s\n", file);
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return 1;
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}
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if (type != BTRFS_FT_REG_FILE) {
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printf("Not a regular file: %s\n", file);
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return 1;
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}
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*size = inode.size;
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return 0;
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}
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int btrfs_read(const char *file, void *buf, loff_t offset, loff_t len,
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loff_t *actread)
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{
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struct btrfs_root root = btrfs_info.fs_root;
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struct btrfs_inode_item inode;
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u64 inr, rd;
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u8 type;
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inr = btrfs_lookup_path(&root, root.root_dirid, file, &type, &inode,
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40);
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if (inr == -1ULL) {
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printf("Cannot lookup file %s\n", file);
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return 1;
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}
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if (type != BTRFS_FT_REG_FILE) {
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printf("Not a regular file: %s\n", file);
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return 1;
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}
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if (!len)
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len = inode.size;
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if (len > inode.size - offset)
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len = inode.size - offset;
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rd = btrfs_file_read(&root, inr, offset, len, buf);
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if (rd == -1ULL) {
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printf("An error occured while reading file %s\n", file);
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return 1;
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}
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*actread = rd;
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return 0;
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}
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void btrfs_close(void)
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{
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btrfs_chunk_map_exit();
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}
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int btrfs_uuid(char *uuid_str)
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{
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#ifdef CONFIG_LIB_UUID
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uuid_bin_to_str(btrfs_info.sb.fsid, uuid_str, UUID_STR_FORMAT_STD);
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return 0;
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#endif
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return -ENOSYS;
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}
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/*
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btrfs_list_subvols();
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*/
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