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https://github.com/brain-hackers/u-boot-brain
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![Tom Rini](/assets/img/avatar_default.png)
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
223 lines
4.7 KiB
C
223 lines
4.7 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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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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#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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