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611 lines
19 KiB
611 lines
19 KiB
#define _LARGEFILE64_SOURCE
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#define LOG_TAG "f2fs_sparseblock"
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#include "f2fs_sparseblock.h"
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#include <errno.h>
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#include <f2fs_fs.h>
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#include <fcntl.h>
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#include <linux/types.h>
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#include <malloc.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <log/log.h>
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#define D_DISP_u32(ptr, member) \
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do { \
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SLOGV("%-30s" \
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"\t\t[0x%#08x : %u]\n", \
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#member, le32_to_cpu((ptr)->member), le32_to_cpu((ptr)->member)); \
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} while (0);
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#define D_DISP_u64(ptr, member) \
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do { \
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SLOGV("%-30s" \
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"\t\t[0x%#016llx : %llu]\n", \
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#member, le64_to_cpu((ptr)->member), le64_to_cpu((ptr)->member)); \
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} while (0);
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#define segno_in_journal(jnl, i) ((jnl)->sit_j.entries[i].segno)
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#define sit_in_journal(jnl, i) ((jnl)->sit_j.entries[i].se)
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static void dbg_print_raw_sb_info(struct f2fs_super_block* sb) {
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SLOGV("\n");
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SLOGV("+--------------------------------------------------------+\n");
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SLOGV("| Super block |\n");
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SLOGV("+--------------------------------------------------------+\n");
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D_DISP_u32(sb, magic);
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D_DISP_u32(sb, major_ver);
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D_DISP_u32(sb, minor_ver);
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D_DISP_u32(sb, log_sectorsize);
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D_DISP_u32(sb, log_sectors_per_block);
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D_DISP_u32(sb, log_blocksize);
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D_DISP_u32(sb, log_blocks_per_seg);
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D_DISP_u32(sb, segs_per_sec);
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D_DISP_u32(sb, secs_per_zone);
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D_DISP_u32(sb, checksum_offset);
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D_DISP_u64(sb, block_count);
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D_DISP_u32(sb, section_count);
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D_DISP_u32(sb, segment_count);
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D_DISP_u32(sb, segment_count_ckpt);
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D_DISP_u32(sb, segment_count_sit);
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D_DISP_u32(sb, segment_count_nat);
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D_DISP_u32(sb, segment_count_ssa);
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D_DISP_u32(sb, segment_count_main);
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D_DISP_u32(sb, segment0_blkaddr);
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D_DISP_u32(sb, cp_blkaddr);
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D_DISP_u32(sb, sit_blkaddr);
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D_DISP_u32(sb, nat_blkaddr);
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D_DISP_u32(sb, ssa_blkaddr);
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D_DISP_u32(sb, main_blkaddr);
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D_DISP_u32(sb, root_ino);
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D_DISP_u32(sb, node_ino);
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D_DISP_u32(sb, meta_ino);
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D_DISP_u32(sb, cp_payload);
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SLOGV("\n");
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}
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static void dbg_print_raw_ckpt_struct(struct f2fs_checkpoint* cp) {
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SLOGV("\n");
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SLOGV("+--------------------------------------------------------+\n");
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SLOGV("| Checkpoint |\n");
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SLOGV("+--------------------------------------------------------+\n");
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D_DISP_u64(cp, checkpoint_ver);
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D_DISP_u64(cp, user_block_count);
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D_DISP_u64(cp, valid_block_count);
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D_DISP_u32(cp, rsvd_segment_count);
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D_DISP_u32(cp, overprov_segment_count);
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D_DISP_u32(cp, free_segment_count);
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D_DISP_u32(cp, alloc_type[CURSEG_HOT_NODE]);
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D_DISP_u32(cp, alloc_type[CURSEG_WARM_NODE]);
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D_DISP_u32(cp, alloc_type[CURSEG_COLD_NODE]);
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D_DISP_u32(cp, cur_node_segno[0]);
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D_DISP_u32(cp, cur_node_segno[1]);
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D_DISP_u32(cp, cur_node_segno[2]);
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D_DISP_u32(cp, cur_node_blkoff[0]);
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D_DISP_u32(cp, cur_node_blkoff[1]);
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D_DISP_u32(cp, cur_node_blkoff[2]);
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D_DISP_u32(cp, alloc_type[CURSEG_HOT_DATA]);
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D_DISP_u32(cp, alloc_type[CURSEG_WARM_DATA]);
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D_DISP_u32(cp, alloc_type[CURSEG_COLD_DATA]);
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D_DISP_u32(cp, cur_data_segno[0]);
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D_DISP_u32(cp, cur_data_segno[1]);
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D_DISP_u32(cp, cur_data_segno[2]);
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D_DISP_u32(cp, cur_data_blkoff[0]);
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D_DISP_u32(cp, cur_data_blkoff[1]);
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D_DISP_u32(cp, cur_data_blkoff[2]);
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D_DISP_u32(cp, ckpt_flags);
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D_DISP_u32(cp, cp_pack_total_block_count);
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D_DISP_u32(cp, cp_pack_start_sum);
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D_DISP_u32(cp, valid_node_count);
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D_DISP_u32(cp, valid_inode_count);
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D_DISP_u32(cp, next_free_nid);
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D_DISP_u32(cp, sit_ver_bitmap_bytesize);
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D_DISP_u32(cp, nat_ver_bitmap_bytesize);
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D_DISP_u32(cp, checksum_offset);
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D_DISP_u64(cp, elapsed_time);
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D_DISP_u32(cp, sit_nat_version_bitmap[0]);
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SLOGV("\n\n");
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}
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static void dbg_print_info_struct(struct f2fs_info* info) {
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SLOGV("\n");
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SLOGV("+--------------------------------------------------------+\n");
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SLOGV("| F2FS_INFO |\n");
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SLOGV("+--------------------------------------------------------+\n");
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SLOGV("blocks_per_segment: %" PRIu64, info->blocks_per_segment);
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SLOGV("block_size: %d", info->block_size);
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SLOGV("sit_bmp loc: %p", info->sit_bmp);
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SLOGV("sit_bmp_size: %d", info->sit_bmp_size);
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SLOGV("blocks_per_sit: %" PRIu64, info->blocks_per_sit);
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SLOGV("sit_blocks loc: %p", info->sit_blocks);
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SLOGV("sit_sums loc: %p", info->sit_sums);
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SLOGV("sit_sums num: %d", le16_to_cpu(info->sit_sums->journal.n_sits));
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unsigned int i;
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for (i = 0; i < (le16_to_cpu(info->sit_sums->journal.n_sits)); i++) {
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SLOGV("entry %d in journal entries is for segment %d", i,
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le32_to_cpu(segno_in_journal(&info->sit_sums->journal, i)));
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}
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SLOGV("cp_blkaddr: %" PRIu64, info->cp_blkaddr);
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SLOGV("cp_valid_cp_blkaddr: %" PRIu64, info->cp_valid_cp_blkaddr);
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SLOGV("sit_blkaddr: %" PRIu64, info->sit_blkaddr);
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SLOGV("nat_blkaddr: %" PRIu64, info->nat_blkaddr);
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SLOGV("ssa_blkaddr: %" PRIu64, info->ssa_blkaddr);
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SLOGV("main_blkaddr: %" PRIu64, info->main_blkaddr);
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SLOGV("total_user_used: %" PRIu64, info->total_user_used);
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SLOGV("total_blocks: %" PRIu64, info->total_blocks);
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SLOGV("\n\n");
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}
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/* read blocks */
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static int read_structure(int fd, unsigned long long start, void* buf, ssize_t len) {
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off64_t ret;
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ret = lseek64(fd, start, SEEK_SET);
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if (ret < 0) {
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SLOGE("failed to seek\n");
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return ret;
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}
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ret = read(fd, buf, len);
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if (ret < 0) {
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SLOGE("failed to read\n");
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return ret;
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}
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if (ret != len) {
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SLOGE("failed to read all\n");
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return -1;
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}
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return 0;
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}
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static int read_structure_blk(int fd, unsigned long long start_blk, void* buf, size_t len) {
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return read_structure(fd, F2FS_BLKSIZE * start_blk, buf, F2FS_BLKSIZE * len);
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}
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static int read_f2fs_sb(int fd, struct f2fs_super_block* sb) {
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int rc;
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rc = read_structure(fd, F2FS_SUPER_OFFSET, sb, sizeof(*sb));
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if (le32_to_cpu(sb->magic) != F2FS_SUPER_MAGIC) {
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SLOGE("Not a valid F2FS super block. Magic:%#08x != %#08x", le32_to_cpu(sb->magic),
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F2FS_SUPER_MAGIC);
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return -1;
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}
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return 0;
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}
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unsigned int get_f2fs_filesystem_size_sec(char* dev) {
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int fd;
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if ((fd = open(dev, O_RDONLY)) < 0) {
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SLOGE("Cannot open device to get filesystem size ");
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return 0;
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}
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struct f2fs_super_block sb;
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if (read_f2fs_sb(fd, &sb)) return 0;
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return (unsigned int)(le64_to_cpu(sb.block_count) * F2FS_BLKSIZE / DEFAULT_SECTOR_SIZE);
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}
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static struct f2fs_checkpoint* validate_checkpoint(block_t cp_addr, unsigned long long* version,
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int fd) {
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unsigned char *cp_block_1, *cp_block_2;
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struct f2fs_checkpoint* cp_block;
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uint64_t cp1_version = 0, cp2_version = 0;
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cp_block_1 = malloc(F2FS_BLKSIZE);
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if (!cp_block_1) return NULL;
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/* Read the 1st cp block in this CP pack */
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if (read_structure_blk(fd, cp_addr, cp_block_1, 1)) goto invalid_cp1;
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/* get the version number */
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cp_block = (struct f2fs_checkpoint*)cp_block_1;
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cp1_version = le64_to_cpu(cp_block->checkpoint_ver);
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cp_block_2 = malloc(F2FS_BLKSIZE);
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if (!cp_block_2) {
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goto invalid_cp1;
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}
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/* Read the 2nd cp block in this CP pack */
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cp_addr += le32_to_cpu(cp_block->cp_pack_total_block_count) - 1;
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if (read_structure_blk(fd, cp_addr, cp_block_2, 1)) {
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goto invalid_cp2;
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}
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cp_block = (struct f2fs_checkpoint*)cp_block_2;
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cp2_version = le64_to_cpu(cp_block->checkpoint_ver);
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if (cp2_version == cp1_version) {
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*version = cp2_version;
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free(cp_block_2);
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return (struct f2fs_checkpoint*)cp_block_1;
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}
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/* There must be something wrong with this checkpoint */
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invalid_cp2:
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free(cp_block_2);
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invalid_cp1:
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free(cp_block_1);
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return NULL;
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}
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int get_valid_checkpoint_info(int fd, struct f2fs_super_block* sb, struct f2fs_checkpoint** cp,
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struct f2fs_info* info) {
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struct f2fs_checkpoint *cp1, *cp2, *cur_cp;
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unsigned long blk_size;
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unsigned long long cp1_version = 0, cp2_version = 0;
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unsigned long long cp1_start_blk_no;
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unsigned long long cp2_start_blk_no;
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blk_size = 1U << le32_to_cpu(sb->log_blocksize);
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/*
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* Find valid cp by reading both packs and finding most recent one.
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*/
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cp1_start_blk_no = le32_to_cpu(sb->cp_blkaddr);
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cp1 = validate_checkpoint(cp1_start_blk_no, &cp1_version, fd);
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/* The second checkpoint pack should start at the next segment */
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cp2_start_blk_no = cp1_start_blk_no + (1 << le32_to_cpu(sb->log_blocks_per_seg));
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cp2 = validate_checkpoint(cp2_start_blk_no, &cp2_version, fd);
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if (cp1 && cp2) {
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if (ver_after(cp2_version, cp1_version)) {
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cur_cp = cp2;
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info->cp_valid_cp_blkaddr = cp2_start_blk_no;
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free(cp1);
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} else {
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cur_cp = cp1;
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info->cp_valid_cp_blkaddr = cp1_start_blk_no;
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free(cp2);
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}
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} else if (cp1) {
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cur_cp = cp1;
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info->cp_valid_cp_blkaddr = cp1_start_blk_no;
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} else if (cp2) {
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cur_cp = cp2;
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info->cp_valid_cp_blkaddr = cp2_start_blk_no;
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} else {
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goto fail_no_cp;
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}
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*cp = cur_cp;
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return 0;
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fail_no_cp:
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SLOGE("Valid Checkpoint not found!!");
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return -EINVAL;
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}
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static int gather_sit_info(int fd, struct f2fs_info* info) {
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uint64_t num_segments =
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(info->total_blocks - info->main_blkaddr + info->blocks_per_segment - 1) /
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info->blocks_per_segment;
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uint64_t num_sit_blocks = (num_segments + SIT_ENTRY_PER_BLOCK - 1) / SIT_ENTRY_PER_BLOCK;
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uint64_t sit_block;
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info->sit_blocks = malloc(num_sit_blocks * sizeof(struct f2fs_sit_block));
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if (!info->sit_blocks) return -1;
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for (sit_block = 0; sit_block < num_sit_blocks; sit_block++) {
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off64_t address = info->sit_blkaddr + sit_block;
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if (f2fs_test_bit(sit_block, info->sit_bmp)) address += info->blocks_per_sit;
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SLOGV("Reading cache block starting at block %" PRIu64, address);
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if (read_structure(fd, address * F2FS_BLKSIZE, &info->sit_blocks[sit_block],
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sizeof(struct f2fs_sit_block))) {
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SLOGE("Could not read sit block at block %" PRIu64, address);
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free(info->sit_blocks);
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info->sit_blocks = NULL;
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return -1;
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}
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}
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return 0;
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}
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static inline int is_set_ckpt_flags(struct f2fs_checkpoint* cp, unsigned int f) {
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unsigned int ckpt_flags = le32_to_cpu(cp->ckpt_flags);
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return !!(ckpt_flags & f);
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}
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static inline uint64_t sum_blk_addr(struct f2fs_checkpoint* cp, struct f2fs_info* info, int base,
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int type) {
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return info->cp_valid_cp_blkaddr + le32_to_cpu(cp->cp_pack_total_block_count) - (base + 1) +
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type;
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}
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static int get_sit_summary(int fd, struct f2fs_info* info, struct f2fs_checkpoint* cp) {
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char buffer[F2FS_BLKSIZE];
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info->sit_sums = calloc(1, sizeof(struct f2fs_summary_block));
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if (!info->sit_sums) return -1;
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/* CURSEG_COLD_DATA where the journaled SIT entries are. */
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if (is_set_ckpt_flags(cp, CP_COMPACT_SUM_FLAG)) {
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if (read_structure_blk(fd, info->cp_valid_cp_blkaddr + le32_to_cpu(cp->cp_pack_start_sum),
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buffer, 1))
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return -1;
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memcpy(&info->sit_sums->journal.n_sits, &buffer[SUM_JOURNAL_SIZE], SUM_JOURNAL_SIZE);
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} else {
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uint64_t blk_addr;
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if (is_set_ckpt_flags(cp, CP_UMOUNT_FLAG))
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blk_addr = sum_blk_addr(cp, info, NR_CURSEG_TYPE, CURSEG_COLD_DATA);
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else
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blk_addr = sum_blk_addr(cp, info, NR_CURSEG_DATA_TYPE, CURSEG_COLD_DATA);
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if (read_structure_blk(fd, blk_addr, buffer, 1)) return -1;
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memcpy(info->sit_sums, buffer, sizeof(struct f2fs_summary_block));
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}
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return 0;
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}
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struct f2fs_info* generate_f2fs_info(int fd) {
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struct f2fs_super_block* sb = NULL;
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struct f2fs_checkpoint* cp = NULL;
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struct f2fs_info* info;
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info = calloc(1, sizeof(*info));
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if (!info) {
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SLOGE("Out of memory!");
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return NULL;
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}
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sb = malloc(sizeof(*sb));
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if (!sb) {
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SLOGE("Out of memory!");
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free(info);
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return NULL;
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}
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if (read_f2fs_sb(fd, sb)) {
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SLOGE("Failed to read superblock");
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free(info);
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free(sb);
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return NULL;
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}
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dbg_print_raw_sb_info(sb);
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info->cp_blkaddr = le32_to_cpu(sb->cp_blkaddr);
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info->sit_blkaddr = le32_to_cpu(sb->sit_blkaddr);
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info->nat_blkaddr = le32_to_cpu(sb->nat_blkaddr);
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info->ssa_blkaddr = le32_to_cpu(sb->ssa_blkaddr);
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info->main_blkaddr = le32_to_cpu(sb->main_blkaddr);
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info->block_size = F2FS_BLKSIZE;
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info->total_blocks = sb->block_count;
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info->blocks_per_sit = (le32_to_cpu(sb->segment_count_sit) >> 1)
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<< le32_to_cpu(sb->log_blocks_per_seg);
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info->blocks_per_segment = 1U << le32_to_cpu(sb->log_blocks_per_seg);
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if (get_valid_checkpoint_info(fd, sb, &cp, info)) goto error;
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dbg_print_raw_ckpt_struct(cp);
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info->total_user_used = le32_to_cpu(cp->valid_block_count);
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u32 bmp_size = le32_to_cpu(cp->sit_ver_bitmap_bytesize);
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/* get sit validity bitmap */
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info->sit_bmp = malloc(bmp_size);
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if (!info->sit_bmp) {
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SLOGE("Out of memory!");
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goto error;
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}
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info->sit_bmp_size = bmp_size;
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if (read_structure(fd,
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info->cp_valid_cp_blkaddr * F2FS_BLKSIZE +
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offsetof(struct f2fs_checkpoint, sit_nat_version_bitmap),
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info->sit_bmp, bmp_size)) {
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SLOGE("Error getting SIT validity bitmap");
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goto error;
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}
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if (gather_sit_info(fd, info)) {
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SLOGE("Error getting SIT information");
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goto error;
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}
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if (get_sit_summary(fd, info, cp)) {
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SLOGE("Error getting SIT entries in summary area");
|
|
goto error;
|
|
}
|
|
dbg_print_info_struct(info);
|
|
return info;
|
|
error:
|
|
free(sb);
|
|
free(cp);
|
|
free_f2fs_info(info);
|
|
return NULL;
|
|
}
|
|
|
|
void free_f2fs_info(struct f2fs_info* info) {
|
|
if (info) {
|
|
free(info->sit_blocks);
|
|
info->sit_blocks = NULL;
|
|
|
|
free(info->sit_bmp);
|
|
info->sit_bmp = NULL;
|
|
|
|
free(info->sit_sums);
|
|
info->sit_sums = NULL;
|
|
}
|
|
free(info);
|
|
}
|
|
|
|
uint64_t get_num_blocks_used(struct f2fs_info* info) {
|
|
return info->main_blkaddr + info->total_user_used;
|
|
}
|
|
|
|
int f2fs_test_bit(unsigned int nr, const char* p) {
|
|
int mask;
|
|
char* addr = (char*)p;
|
|
|
|
addr += (nr >> 3);
|
|
mask = 1 << (7 - (nr & 0x07));
|
|
return (mask & *addr) != 0;
|
|
}
|
|
|
|
int run_on_used_blocks(uint64_t startblock, struct f2fs_info* info,
|
|
int (*func)(uint64_t pos, void* data), void* data) {
|
|
struct f2fs_sit_entry* sit_entry;
|
|
uint64_t sit_block_num_cur = 0, segnum = 0, block_offset;
|
|
uint64_t block;
|
|
unsigned int used, found, i;
|
|
|
|
block = startblock;
|
|
while (block < info->total_blocks) {
|
|
/* TODO: Save only relevant portions of metadata */
|
|
if (block < info->main_blkaddr) {
|
|
if (func(block, data)) {
|
|
SLOGI("func error");
|
|
return -1;
|
|
}
|
|
} else {
|
|
/* Main Section */
|
|
segnum = (block - info->main_blkaddr) / info->blocks_per_segment;
|
|
|
|
/* check the SIT entries in the journal */
|
|
found = 0;
|
|
for (i = 0; i < le16_to_cpu(info->sit_sums->journal.n_sits); i++) {
|
|
if (le32_to_cpu(segno_in_journal(&info->sit_sums->journal, i)) == segnum) {
|
|
sit_entry = &sit_in_journal(&info->sit_sums->journal, i);
|
|
found = 1;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* get SIT entry from SIT section */
|
|
if (!found) {
|
|
sit_block_num_cur = segnum / SIT_ENTRY_PER_BLOCK;
|
|
sit_entry =
|
|
&info->sit_blocks[sit_block_num_cur].entries[segnum % SIT_ENTRY_PER_BLOCK];
|
|
}
|
|
|
|
block_offset = (block - info->main_blkaddr) % info->blocks_per_segment;
|
|
|
|
if (block_offset == 0 && GET_SIT_VBLOCKS(sit_entry) == 0) {
|
|
block += info->blocks_per_segment;
|
|
continue;
|
|
}
|
|
|
|
used = f2fs_test_bit(block_offset, (char*)sit_entry->valid_map);
|
|
if (used)
|
|
if (func(block, data)) return -1;
|
|
}
|
|
|
|
block++;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
struct privdata {
|
|
int count;
|
|
int infd;
|
|
int outfd;
|
|
char* buf;
|
|
char* zbuf;
|
|
int done;
|
|
struct f2fs_info* info;
|
|
};
|
|
|
|
/*
|
|
* This is a simple test program. It performs a block to block copy of a
|
|
* filesystem, replacing blocks identified as unused with 0's.
|
|
*/
|
|
|
|
int copy_used(uint64_t pos, void* data) {
|
|
struct privdata* d = data;
|
|
char* buf;
|
|
int pdone = (pos * 100) / d->info->total_blocks;
|
|
if (pdone > d->done) {
|
|
d->done = pdone;
|
|
printf("Done with %d percent\n", d->done);
|
|
}
|
|
|
|
d->count++;
|
|
buf = d->buf;
|
|
if (read_structure_blk(d->infd, (unsigned long long)pos, d->buf, 1)) {
|
|
printf("Error reading!!!\n");
|
|
return -1;
|
|
}
|
|
|
|
off64_t ret;
|
|
ret = lseek64(d->outfd, pos * F2FS_BLKSIZE, SEEK_SET);
|
|
if (ret < 0) {
|
|
SLOGE("failed to seek\n");
|
|
return ret;
|
|
}
|
|
|
|
ret = write(d->outfd, d->buf, F2FS_BLKSIZE);
|
|
if (ret < 0) {
|
|
SLOGE("failed to write\n");
|
|
return ret;
|
|
}
|
|
if (ret != F2FS_BLKSIZE) {
|
|
SLOGE("failed to read all\n");
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int main(int argc, char** argv) {
|
|
if (argc != 3) printf("Usage: %s fs_file_in fs_file_out\n", argv[0]);
|
|
char* in = argv[1];
|
|
char* out = argv[2];
|
|
int infd, outfd;
|
|
|
|
if ((infd = open(in, O_RDONLY)) < 0) {
|
|
SLOGE("Cannot open device");
|
|
return 0;
|
|
}
|
|
if ((outfd = open(out, O_WRONLY | O_CREAT, S_IRUSR | S_IWUSR)) < 0) {
|
|
SLOGE("Cannot open output");
|
|
return 0;
|
|
}
|
|
|
|
struct privdata d;
|
|
d.infd = infd;
|
|
d.outfd = outfd;
|
|
d.count = 0;
|
|
struct f2fs_info* info = generate_f2fs_info(infd);
|
|
if (!info) {
|
|
printf("Failed to generate info!");
|
|
return -1;
|
|
}
|
|
char* buf = malloc(F2FS_BLKSIZE);
|
|
char* zbuf = calloc(1, F2FS_BLKSIZE);
|
|
d.buf = buf;
|
|
d.zbuf = zbuf;
|
|
d.done = 0;
|
|
d.info = info;
|
|
int expected_count = get_num_blocks_used(info);
|
|
run_on_used_blocks(0, info, ©_used, &d);
|
|
printf("Copied %d blocks. Expected to copy %d\n", d.count, expected_count);
|
|
ftruncate64(outfd, info->total_blocks * F2FS_BLKSIZE);
|
|
free_f2fs_info(info);
|
|
free(buf);
|
|
free(zbuf);
|
|
close(infd);
|
|
close(outfd);
|
|
return 0;
|
|
}
|