u-boot/fs/btrfs/btrfs.c
Qu Wenruo 5573c20fad fs: btrfs: Cleanup the old implementation
This cleans up the now unneeded code from the old btrfs implementation.

Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Marek Behún <marek.behun@nic.cz>
2020-09-07 21:00:36 -04:00

285 lines
6.4 KiB
C

// 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_fs_info *current_fs_info;
static int show_dir(struct btrfs_root *root, struct extent_buffer *eb,
struct btrfs_dir_item *di)
{
struct btrfs_fs_info *fs_info = root->fs_info;
struct btrfs_inode_item ii;
struct btrfs_key key;
static const char* dir_item_str[] = {
[BTRFS_FT_REG_FILE] = "FILE",
[BTRFS_FT_DIR] = "DIR",
[BTRFS_FT_CHRDEV] = "CHRDEV",
[BTRFS_FT_BLKDEV] = "BLKDEV",
[BTRFS_FT_FIFO] = "FIFO",
[BTRFS_FT_SOCK] = "SOCK",
[BTRFS_FT_SYMLINK] = "SYMLINK",
[BTRFS_FT_XATTR] = "XATTR"
};
u8 type = btrfs_dir_type(eb, di);
char namebuf[BTRFS_NAME_LEN];
char *target = NULL;
char filetime[32];
time_t mtime;
int ret;
btrfs_dir_item_key_to_cpu(eb, di, &key);
if (key.type == BTRFS_ROOT_ITEM_KEY) {
struct btrfs_root *subvol;
/* It's a subvolume, get its mtime from root item */
subvol = btrfs_read_fs_root(fs_info, &key);
if (IS_ERR(subvol)) {
ret = PTR_ERR(subvol);
error("Can't find root %llu", key.objectid);
return ret;
}
mtime = btrfs_stack_timespec_sec(&subvol->root_item.otime);
} else {
struct btrfs_path path;
/* It's regular inode, get its mtime from inode item */
btrfs_init_path(&path);
ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
if (ret > 0)
ret = -ENOENT;
if (ret < 0) {
error("Can't find inode %llu", key.objectid);
btrfs_release_path(&path);
return ret;
}
read_extent_buffer(path.nodes[0], &ii,
btrfs_item_ptr_offset(path.nodes[0], path.slots[0]),
sizeof(ii));
btrfs_release_path(&path);
mtime = btrfs_stack_timespec_sec(&ii.mtime);
}
ctime_r(&mtime, filetime);
if (type == BTRFS_FT_SYMLINK) {
target = malloc(fs_info->sectorsize);
if (!target) {
error("Can't alloc memory for symlink %llu",
key.objectid);
return -ENOMEM;
}
ret = btrfs_readlink(root, key.objectid, target);
if (ret < 0) {
error("Failed to read symlink %llu", key.objectid);
goto out;
}
target[ret] = '\0';
}
if (type < ARRAY_SIZE(dir_item_str) && dir_item_str[type])
printf("<%s> ", dir_item_str[type]);
else
printf("DIR_ITEM.%u", type);
if (type == BTRFS_FT_CHRDEV || type == BTRFS_FT_BLKDEV) {
ASSERT(key.type == BTRFS_INODE_ITEM_KEY);
printf("%4llu,%5llu ", btrfs_stack_inode_rdev(&ii) >> 20,
btrfs_stack_inode_rdev(&ii) & 0xfffff);
} else {
if (key.type == BTRFS_INODE_ITEM_KEY)
printf("%10llu ", btrfs_stack_inode_size(&ii));
else
printf("%10llu ", 0ULL);
}
read_extent_buffer(eb, namebuf, (unsigned long)(di + 1),
btrfs_dir_name_len(eb, di));
printf("%24.24s %.*s", filetime, btrfs_dir_name_len(eb, di), namebuf);
if (type == BTRFS_FT_SYMLINK)
printf(" -> %s", target ? target : "?");
printf("\n");
out:
free(target);
return ret;
}
int btrfs_probe(struct blk_desc *fs_dev_desc,
struct disk_partition *fs_partition)
{
struct btrfs_fs_info *fs_info;
int ret = -1;
btrfs_hash_init();
fs_info = open_ctree_fs_info(fs_dev_desc, fs_partition);
if (fs_info) {
current_fs_info = fs_info;
ret = 0;
}
return ret;
}
int btrfs_ls(const char *path)
{
struct btrfs_fs_info *fs_info = current_fs_info;
struct btrfs_root *root = fs_info->fs_root;
u64 ino = BTRFS_FIRST_FREE_OBJECTID;
u8 type;
int ret;
ASSERT(fs_info);
ret = btrfs_lookup_path(fs_info->fs_root, BTRFS_FIRST_FREE_OBJECTID,
path, &root, &ino, &type, 40);
if (ret < 0) {
printf("Cannot lookup path %s\n", path);
return ret;
}
if (type != BTRFS_FT_DIR) {
error("Not a directory: %s", path);
return -ENOENT;
}
ret = btrfs_iter_dir(root, ino, show_dir);
if (ret < 0) {
error("An error occured while listing directory %s", path);
return ret;
}
return 0;
}
int btrfs_exists(const char *file)
{
struct btrfs_fs_info *fs_info = current_fs_info;
struct btrfs_root *root;
u64 ino;
u8 type;
int ret;
ASSERT(fs_info);
ret = btrfs_lookup_path(fs_info->fs_root, BTRFS_FIRST_FREE_OBJECTID,
file, &root, &ino, &type, 40);
if (ret < 0)
return 0;
if (type == BTRFS_FT_REG_FILE)
return 1;
return 0;
}
int btrfs_size(const char *file, loff_t *size)
{
struct btrfs_fs_info *fs_info = current_fs_info;
struct btrfs_inode_item *ii;
struct btrfs_root *root;
struct btrfs_path path;
struct btrfs_key key;
u64 ino;
u8 type;
int ret;
ret = btrfs_lookup_path(fs_info->fs_root, BTRFS_FIRST_FREE_OBJECTID,
file, &root, &ino, &type, 40);
if (ret < 0) {
printf("Cannot lookup file %s\n", file);
return ret;
}
if (type != BTRFS_FT_REG_FILE) {
printf("Not a regular file: %s\n", file);
return -ENOENT;
}
btrfs_init_path(&path);
key.objectid = ino;
key.type = BTRFS_INODE_ITEM_KEY;
key.offset = 0;
ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
if (ret < 0) {
printf("Cannot lookup ino %llu\n", ino);
return ret;
}
if (ret > 0) {
printf("Ino %llu does not exist\n", ino);
ret = -ENOENT;
goto out;
}
ii = btrfs_item_ptr(path.nodes[0], path.slots[0],
struct btrfs_inode_item);
*size = btrfs_inode_size(path.nodes[0], ii);
out:
btrfs_release_path(&path);
return ret;
}
int btrfs_read(const char *file, void *buf, loff_t offset, loff_t len,
loff_t *actread)
{
struct btrfs_fs_info *fs_info = current_fs_info;
struct btrfs_root *root;
loff_t real_size = 0;
u64 ino;
u8 type;
int ret;
ASSERT(fs_info);
ret = btrfs_lookup_path(fs_info->fs_root, BTRFS_FIRST_FREE_OBJECTID,
file, &root, &ino, &type, 40);
if (ret < 0) {
error("Cannot lookup file %s", file);
return ret;
}
if (type != BTRFS_FT_REG_FILE) {
error("Not a regular file: %s", file);
return -EINVAL;
}
if (!len) {
ret = btrfs_size(file, &real_size);
if (ret < 0) {
error("Failed to get inode size: %s", file);
return ret;
}
len = real_size;
}
if (len > real_size - offset)
len = real_size - offset;
ret = btrfs_file_read(root, ino, offset, len, buf);
if (ret < 0) {
error("An error occured while reading file %s", file);
return ret;
}
*actread = len;
return 0;
}
void btrfs_close(void)
{
if (current_fs_info) {
close_ctree_fs_info(current_fs_info);
current_fs_info = NULL;
}
}
int btrfs_uuid(char *uuid_str)
{
#ifdef CONFIG_LIB_UUID
if (current_fs_info)
uuid_bin_to_str(current_fs_info->super_copy->fsid, uuid_str,
UUID_STR_FORMAT_STD);
return 0;
#endif
return -ENOSYS;
}