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-rw-r--r--fs/btrfs/super.c258
1 files changed, 0 insertions, 258 deletions
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
deleted file mode 100644
index 101572b..0000000
--- a/fs/btrfs/super.c
+++ /dev/null
@@ -1,258 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0+
-/*
- * BTRFS filesystem implementation for U-Boot
- *
- * 2017 Marek Behun, CZ.NIC, marek.behun@nic.cz
- */
-
-#include <common.h>
-#include <log.h>
-#include <memalign.h>
-#include <part.h>
-#include <linux/compat.h>
-#include "btrfs.h"
-#include "disk-io.h"
-
-#define BTRFS_SUPER_FLAG_SUPP (BTRFS_HEADER_FLAG_WRITTEN \
- | BTRFS_HEADER_FLAG_RELOC \
- | BTRFS_SUPER_FLAG_ERROR \
- | BTRFS_SUPER_FLAG_SEEDING \
- | BTRFS_SUPER_FLAG_METADUMP)
-
-#define BTRFS_SUPER_INFO_SIZE 4096
-
-/*
- * checks if a valid root backup is present.
- * considers the case when all root backups empty valid.
- * returns -1 in case of invalid root backup and 0 for valid.
- */
-static int btrfs_check_super_roots(struct btrfs_super_block *sb)
-{
- struct btrfs_root_backup *root_backup;
- int i, newest = -1;
- int num_empty = 0;
-
- for (i = 0; i < BTRFS_NUM_BACKUP_ROOTS; ++i) {
- root_backup = sb->super_roots + i;
-
- if (root_backup->tree_root == 0 && root_backup->tree_root_gen == 0)
- num_empty++;
-
- if (root_backup->tree_root_gen == sb->generation)
- newest = i;
- }
-
- if (num_empty == BTRFS_NUM_BACKUP_ROOTS) {
- return 0;
- } else if (newest >= 0) {
- return 0;
- }
-
- return -1;
-}
-
-static inline int is_power_of_2(u64 x)
-{
- return !(x & (x - 1));
-}
-
-static int btrfs_check_super_csum(char *raw_disk_sb)
-{
- struct btrfs_super_block *disk_sb =
- (struct btrfs_super_block *) raw_disk_sb;
- u16 csum_type = le16_to_cpu(disk_sb->csum_type);
-
- if (csum_type == BTRFS_CSUM_TYPE_CRC32 ||
- csum_type == BTRFS_CSUM_TYPE_SHA256 ||
- csum_type == BTRFS_CSUM_TYPE_XXHASH) {
- u8 result[BTRFS_CSUM_SIZE];
-
- btrfs_csum_data(csum_type, (u8 *)raw_disk_sb + BTRFS_CSUM_SIZE,
- result, BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
-
- if (memcmp(raw_disk_sb, result, BTRFS_CSUM_SIZE))
- return -EIO;
- } else if (csum_type == BTRFS_CSUM_TYPE_BLAKE2) {
- printf("Blake2 csum type is not supported yet\n");
- return -ENOTSUPP;
- }
-
- return 0;
-}
-
-static int btrfs_check_super(struct btrfs_super_block *sb)
-{
- int ret = 0;
-
- if (sb->flags & ~BTRFS_SUPER_FLAG_SUPP) {
- printf("%s: Unsupported flags: %llu\n", __func__,
- sb->flags & ~BTRFS_SUPER_FLAG_SUPP);
- }
-
- if (sb->root_level > BTRFS_MAX_LEVEL) {
- printf("%s: tree_root level too big: %d >= %d\n", __func__,
- sb->root_level, BTRFS_MAX_LEVEL);
- ret = -1;
- }
-
- if (sb->chunk_root_level > BTRFS_MAX_LEVEL) {
- printf("%s: chunk_root level too big: %d >= %d\n", __func__,
- sb->chunk_root_level, BTRFS_MAX_LEVEL);
- ret = -1;
- }
-
- if (sb->log_root_level > BTRFS_MAX_LEVEL) {
- printf("%s: log_root level too big: %d >= %d\n", __func__,
- sb->log_root_level, BTRFS_MAX_LEVEL);
- ret = -1;
- }
-
- if (!is_power_of_2(sb->sectorsize) || sb->sectorsize < 4096 ||
- sb->sectorsize > BTRFS_MAX_METADATA_BLOCKSIZE) {
- printf("%s: invalid sectorsize %u\n", __func__,
- sb->sectorsize);
- ret = -1;
- }
-
- if (!is_power_of_2(sb->nodesize) || sb->nodesize < sb->sectorsize ||
- sb->nodesize > BTRFS_MAX_METADATA_BLOCKSIZE) {
- printf("%s: invalid nodesize %u\n", __func__, sb->nodesize);
- ret = -1;
- }
-
- if (sb->nodesize != sb->__unused_leafsize) {
- printf("%s: invalid leafsize %u, should be %u\n", __func__,
- sb->__unused_leafsize, sb->nodesize);
- ret = -1;
- }
-
- if (!IS_ALIGNED(sb->root, sb->sectorsize)) {
- printf("%s: tree_root block unaligned: %llu\n", __func__,
- sb->root);
- ret = -1;
- }
-
- if (!IS_ALIGNED(sb->chunk_root, sb->sectorsize)) {
- printf("%s: chunk_root block unaligned: %llu\n", __func__,
- sb->chunk_root);
- ret = -1;
- }
-
- if (!IS_ALIGNED(sb->log_root, sb->sectorsize)) {
- printf("%s: log_root block unaligned: %llu\n", __func__,
- sb->log_root);
- ret = -1;
- }
-
- if (memcmp(sb->fsid, sb->dev_item.fsid, BTRFS_UUID_SIZE) != 0) {
- printf("%s: dev_item UUID does not match fsid\n", __func__);
- ret = -1;
- }
-
- if (sb->bytes_used < 6*sb->nodesize) {
- printf("%s: bytes_used is too small %llu\n", __func__,
- sb->bytes_used);
- ret = -1;
- }
-
- if (!is_power_of_2(sb->stripesize)) {
- printf("%s: invalid stripesize %u\n", __func__, sb->stripesize);
- ret = -1;
- }
-
- if (sb->sys_chunk_array_size > BTRFS_SYSTEM_CHUNK_ARRAY_SIZE) {
- printf("%s: system chunk array too big %u > %u\n", __func__,
- sb->sys_chunk_array_size, BTRFS_SYSTEM_CHUNK_ARRAY_SIZE);
- ret = -1;
- }
-
- if (sb->sys_chunk_array_size < sizeof(struct btrfs_key) +
- sizeof(struct btrfs_chunk)) {
- printf("%s: system chunk array too small %u < %zu\n", __func__,
- sb->sys_chunk_array_size, sizeof(struct btrfs_key)
- + sizeof(struct btrfs_chunk));
- ret = -1;
- }
-
- return ret;
-}
-
-int btrfs_read_superblock(void)
-{
- const u64 superblock_offsets[4] = {
- 0x10000ull,
- 0x4000000ull,
- 0x4000000000ull,
- 0x4000000000000ull
- };
- ALLOC_CACHE_ALIGN_BUFFER(char, raw_sb, BTRFS_SUPER_INFO_SIZE);
- struct btrfs_super_block *sb = (struct btrfs_super_block *) raw_sb;
- u64 dev_total_bytes;
- int i;
-
- dev_total_bytes = (u64) btrfs_part_info->size * btrfs_part_info->blksz;
-
- btrfs_info.sb.generation = 0;
-
- for (i = 0; i < 4; ++i) {
- if (superblock_offsets[i] + sizeof(sb) > dev_total_bytes)
- break;
-
- if (!btrfs_devread(superblock_offsets[i], BTRFS_SUPER_INFO_SIZE,
- raw_sb))
- break;
-
- if (btrfs_check_super_csum(raw_sb)) {
- debug("%s: invalid checksum at superblock mirror %i\n",
- __func__, i);
- continue;
- }
-
- btrfs_super_block_to_cpu(sb);
-
- if (sb->magic != BTRFS_MAGIC) {
- debug("%s: invalid BTRFS magic 0x%016llX at "
- "superblock mirror %i\n", __func__, sb->magic, i);
- } else if (sb->bytenr != superblock_offsets[i]) {
- printf("%s: invalid bytenr 0x%016llX (expected "
- "0x%016llX) at superblock mirror %i\n",
- __func__, sb->bytenr, superblock_offsets[i], i);
- } else if (btrfs_check_super(sb)) {
- printf("%s: Checking superblock mirror %i failed\n",
- __func__, i);
- } else if (sb->generation > btrfs_info.sb.generation) {
- memcpy(&btrfs_info.sb, sb, sizeof(*sb));
- } else {
- /* Nothing */
- }
- }
-
- if (!btrfs_info.sb.generation) {
- debug("%s: No valid BTRFS superblock found!\n", __func__);
- return -1;
- }
-
- if (btrfs_check_super_roots(&btrfs_info.sb)) {
- printf("%s: No valid root_backup found!\n", __func__);
- return -1;
- }
-
- if (sb->sectorsize != PAGE_SIZE) {
- printf(
- "%s: Unsupported sector size (%u), only supports %u as sector size\n",
- __func__, sb->sectorsize, PAGE_SIZE);
- return -1;
- }
-
- if (btrfs_info.sb.num_devices != 1) {
- printf("%s: Unsupported number of devices (%lli). This driver "
- "only supports filesystem on one device.\n", __func__,
- btrfs_info.sb.num_devices);
- return -1;
- }
-
- debug("Chosen superblock with generation = %llu\n",
- btrfs_info.sb.generation);
-
- return 0;
-}
generated by cgit v1.1 at 2024-10-08 05:25:05 +0000