u-boot/fs/btrfs/btrfs.c
Tom Rini 83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style
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>
2018-05-07 09:34:12 -04:00

222 lines
4.7 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* BTRFS filesystem implementation for U-Boot
*
* 2017 Marek Behun, CZ.NIC, marek.behun@nic.cz
*/
#include "btrfs.h"
#include <config.h>
#include <malloc.h>
#include <linux/time.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, &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, disk_partition_t *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;
}