/* * f2fs.c - Flash-Friendly File System * * Written by Jaegeuk Kim * * Copyright (C) 2015 Free Software Foundation, Inc. * * GRUB is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * GRUB is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with GRUB. If not, see . */ #include #include #include #include #include #include #include #include #include GRUB_MOD_LICENSE ("GPLv3+"); /* F2FS Magic Number. */ #define F2FS_SUPER_MAGIC 0xf2f52010 #define CHECKSUM_OFFSET 4092 /* Must be aligned 4 bytes. */ #define U32_CHECKSUM_OFFSET (CHECKSUM_OFFSET >> 2) #define CRCPOLY_LE 0xedb88320 /* Byte-size offset. */ #define F2FS_SUPER_OFFSET ((grub_disk_addr_t)1024) #define F2FS_SUPER_OFFSET0 (F2FS_SUPER_OFFSET >> GRUB_DISK_SECTOR_BITS) #define F2FS_SUPER_OFFSET1 ((F2FS_SUPER_OFFSET + F2FS_BLKSIZE) >> \ GRUB_DISK_SECTOR_BITS) /* 9 bits for 512 bytes. */ #define F2FS_MIN_LOG_SECTOR_SIZE 9 /* Support only 4KB block. */ #define F2FS_BLK_BITS 12 #define F2FS_BLKSIZE (1 << F2FS_BLK_BITS) #define F2FS_BLK_SEC_BITS (F2FS_BLK_BITS - GRUB_DISK_SECTOR_BITS) #define VERSION_LEN 256 #define F2FS_MAX_EXTENSION 64 #define CP_COMPACT_SUM_FLAG 0x00000004 #define CP_UMOUNT_FLAG 0x00000001 #define MAX_ACTIVE_LOGS 16 #define MAX_ACTIVE_NODE_LOGS 8 #define MAX_ACTIVE_DATA_LOGS 8 #define NR_CURSEG_DATA_TYPE 3 #define NR_CURSEG_NODE_TYPE 3 #define NR_CURSEG_TYPE (NR_CURSEG_DATA_TYPE + NR_CURSEG_NODE_TYPE) #define ENTRIES_IN_SUM 512 #define SUMMARY_SIZE 7 #define SUM_FOOTER_SIZE 5 #define JENTRY_SIZE (sizeof(struct grub_f2fs_nat_jent)) #define SUM_ENTRIES_SIZE (SUMMARY_SIZE * ENTRIES_IN_SUM) #define SUM_JOURNAL_SIZE (F2FS_BLKSIZE - SUM_FOOTER_SIZE - SUM_ENTRIES_SIZE) #define NAT_JOURNAL_ENTRIES ((SUM_JOURNAL_SIZE - 2) / JENTRY_SIZE) #define NAT_JOURNAL_RESERVED ((SUM_JOURNAL_SIZE - 2) % JENTRY_SIZE) #define NAT_ENTRY_SIZE (sizeof(struct grub_f2fs_nat_entry)) #define NAT_ENTRY_PER_BLOCK (F2FS_BLKSIZE / NAT_ENTRY_SIZE) #define F2FS_NAME_LEN 255 #define F2FS_SLOT_LEN 8 #define NR_DENTRY_IN_BLOCK 214 #define SIZE_OF_DIR_ENTRY 11 /* By byte. */ #define BITS_PER_BYTE 8 #define SIZE_OF_DENTRY_BITMAP ((NR_DENTRY_IN_BLOCK + BITS_PER_BYTE - 1) / \ BITS_PER_BYTE) #define SIZE_OF_RESERVED (F2FS_BLKSIZE - \ ((SIZE_OF_DIR_ENTRY + F2FS_SLOT_LEN) * \ NR_DENTRY_IN_BLOCK + SIZE_OF_DENTRY_BITMAP)) #define F2FS_INLINE_XATTR_ADDRS 50 /* 200 bytes for inline xattrs. */ #define DEF_ADDRS_PER_INODE 923 /* Address Pointers in an Inode. */ #define ADDRS_PER_BLOCK 1018 /* Address Pointers in a Direct Block. */ #define NIDS_PER_BLOCK 1018 /* Node IDs in an Indirect Block. */ #define NODE_DIR1_BLOCK (DEF_ADDRS_PER_INODE + 1) #define NODE_DIR2_BLOCK (DEF_ADDRS_PER_INODE + 2) #define NODE_IND1_BLOCK (DEF_ADDRS_PER_INODE + 3) #define NODE_IND2_BLOCK (DEF_ADDRS_PER_INODE + 4) #define NODE_DIND_BLOCK (DEF_ADDRS_PER_INODE + 5) #define MAX_INLINE_DATA (4 * (DEF_ADDRS_PER_INODE - \ F2FS_INLINE_XATTR_ADDRS - 1)) #define NR_INLINE_DENTRY (MAX_INLINE_DATA * BITS_PER_BYTE / \ ((SIZE_OF_DIR_ENTRY + F2FS_SLOT_LEN) * \ BITS_PER_BYTE + 1)) #define INLINE_DENTRY_BITMAP_SIZE ((NR_INLINE_DENTRY + BITS_PER_BYTE - 1) / \ BITS_PER_BYTE) #define INLINE_RESERVED_SIZE (MAX_INLINE_DATA - \ ((SIZE_OF_DIR_ENTRY + F2FS_SLOT_LEN) * \ NR_INLINE_DENTRY + \ INLINE_DENTRY_BITMAP_SIZE)) #define CURSEG_HOT_DATA 0 #define CKPT_FLAG_SET(ckpt, f) (ckpt)->ckpt_flags & \ grub_cpu_to_le32_compile_time (f) #define F2FS_INLINE_XATTR 0x01 /* File inline xattr flag. */ #define F2FS_INLINE_DATA 0x02 /* File inline data flag. */ #define F2FS_INLINE_DENTRY 0x04 /* File inline dentry flag. */ #define F2FS_DATA_EXIST 0x08 /* File inline data exist flag. */ #define F2FS_INLINE_DOTS 0x10 /* File having implicit dot dentries. */ #define MAX_VOLUME_NAME 512 enum FILE_TYPE { F2FS_FT_UNKNOWN, F2FS_FT_REG_FILE = 1, F2FS_FT_DIR = 2, F2FS_FT_SYMLINK = 7 }; struct grub_f2fs_superblock { grub_uint32_t magic; grub_uint16_t dummy1[2]; grub_uint32_t log_sectorsize; grub_uint32_t log_sectors_per_block; grub_uint32_t log_blocksize; grub_uint32_t log_blocks_per_seg; grub_uint32_t segs_per_sec; grub_uint32_t secs_per_zone; grub_uint32_t checksum_offset; grub_uint8_t dummy2[40]; grub_uint32_t cp_blkaddr; grub_uint32_t sit_blkaddr; grub_uint32_t nat_blkaddr; grub_uint32_t ssa_blkaddr; grub_uint32_t main_blkaddr; grub_uint32_t root_ino; grub_uint32_t node_ino; grub_uint32_t meta_ino; grub_uint8_t uuid[16]; grub_uint16_t volume_name[MAX_VOLUME_NAME]; grub_uint32_t extension_count; grub_uint8_t extension_list[F2FS_MAX_EXTENSION][8]; grub_uint32_t cp_payload; grub_uint8_t version[VERSION_LEN]; grub_uint8_t init_version[VERSION_LEN]; } GRUB_PACKED; struct grub_f2fs_checkpoint { grub_uint64_t checkpoint_ver; grub_uint64_t user_block_count; grub_uint64_t valid_block_count; grub_uint32_t rsvd_segment_count; grub_uint32_t overprov_segment_count; grub_uint32_t free_segment_count; grub_uint32_t cur_node_segno[MAX_ACTIVE_NODE_LOGS]; grub_uint16_t cur_node_blkoff[MAX_ACTIVE_NODE_LOGS]; grub_uint32_t cur_data_segno[MAX_ACTIVE_DATA_LOGS]; grub_uint16_t cur_data_blkoff[MAX_ACTIVE_DATA_LOGS]; grub_uint32_t ckpt_flags; grub_uint32_t cp_pack_total_block_count; grub_uint32_t cp_pack_start_sum; grub_uint32_t valid_node_count; grub_uint32_t valid_inode_count; grub_uint32_t next_free_nid; grub_uint32_t sit_ver_bitmap_bytesize; grub_uint32_t nat_ver_bitmap_bytesize; grub_uint32_t checksum_offset; grub_uint64_t elapsed_time; grub_uint8_t alloc_type[MAX_ACTIVE_LOGS]; grub_uint8_t sit_nat_version_bitmap[3900]; grub_uint32_t checksum; } GRUB_PACKED; struct grub_f2fs_nat_entry { grub_uint8_t version; grub_uint32_t ino; grub_uint32_t block_addr; } GRUB_PACKED; struct grub_f2fs_nat_jent { grub_uint32_t nid; struct grub_f2fs_nat_entry ne; } GRUB_PACKED; struct grub_f2fs_nat_journal { grub_uint16_t n_nats; struct grub_f2fs_nat_jent entries[NAT_JOURNAL_ENTRIES]; grub_uint8_t reserved[NAT_JOURNAL_RESERVED]; } GRUB_PACKED; struct grub_f2fs_nat_block { struct grub_f2fs_nat_entry ne[NAT_ENTRY_PER_BLOCK]; } GRUB_PACKED; struct grub_f2fs_dir_entry { grub_uint32_t hash_code; grub_uint32_t ino; grub_uint16_t name_len; grub_uint8_t file_type; } GRUB_PACKED; struct grub_f2fs_inline_dentry { grub_uint8_t dentry_bitmap[INLINE_DENTRY_BITMAP_SIZE]; grub_uint8_t reserved[INLINE_RESERVED_SIZE]; struct grub_f2fs_dir_entry dentry[NR_INLINE_DENTRY]; grub_uint8_t filename[NR_INLINE_DENTRY][F2FS_SLOT_LEN]; } GRUB_PACKED; struct grub_f2fs_dentry_block { grub_uint8_t dentry_bitmap[SIZE_OF_DENTRY_BITMAP]; grub_uint8_t reserved[SIZE_OF_RESERVED]; struct grub_f2fs_dir_entry dentry[NR_DENTRY_IN_BLOCK]; grub_uint8_t filename[NR_DENTRY_IN_BLOCK][F2FS_SLOT_LEN]; } GRUB_PACKED; struct grub_f2fs_inode { grub_uint16_t i_mode; grub_uint8_t i_advise; grub_uint8_t i_inline; grub_uint32_t i_uid; grub_uint32_t i_gid; grub_uint32_t i_links; grub_uint64_t i_size; grub_uint64_t i_blocks; grub_uint64_t i_atime; grub_uint64_t i_ctime; grub_uint64_t i_mtime; grub_uint32_t i_atime_nsec; grub_uint32_t i_ctime_nsec; grub_uint32_t i_mtime_nsec; grub_uint32_t i_generation; grub_uint32_t i_current_depth; grub_uint32_t i_xattr_nid; grub_uint32_t i_flags; grub_uint32_t i_pino; grub_uint32_t i_namelen; grub_uint8_t i_name[F2FS_NAME_LEN]; grub_uint8_t i_dir_level; grub_uint8_t i_ext[12]; grub_uint32_t i_addr[DEF_ADDRS_PER_INODE]; grub_uint32_t i_nid[5]; } GRUB_PACKED; struct grub_direct_node { grub_uint32_t addr[ADDRS_PER_BLOCK]; } GRUB_PACKED; struct grub_indirect_node { grub_uint32_t nid[NIDS_PER_BLOCK]; } GRUB_PACKED; struct grub_f2fs_node { union { struct grub_f2fs_inode i; struct grub_direct_node dn; struct grub_indirect_node in; /* Should occupy F2FS_BLKSIZE totally. */ char buf[F2FS_BLKSIZE - 40]; }; grub_uint8_t dummy[40]; } GRUB_PACKED; struct grub_fshelp_node { struct grub_f2fs_data *data; struct grub_f2fs_node inode; grub_uint32_t ino; int inode_read; }; struct grub_f2fs_data { struct grub_f2fs_superblock sblock; struct grub_f2fs_checkpoint ckpt; grub_uint32_t root_ino; grub_uint32_t blocks_per_seg; grub_uint32_t cp_blkaddr; grub_uint32_t nat_blkaddr; struct grub_f2fs_nat_journal nat_j; char *nat_bitmap; grub_disk_t disk; struct grub_f2fs_node *inode; struct grub_fshelp_node diropen; }; struct grub_f2fs_dir_iter_ctx { struct grub_f2fs_data *data; grub_fshelp_iterate_dir_hook_t hook; void *hook_data; grub_uint8_t *bitmap; grub_uint8_t (*filename)[F2FS_SLOT_LEN]; struct grub_f2fs_dir_entry *dentry; int max; }; struct grub_f2fs_dir_ctx { grub_fs_dir_hook_t hook; void *hook_data; struct grub_f2fs_data *data; }; static grub_dl_t my_mod; static int grub_f2fs_test_bit_le (int nr, const grub_uint8_t *addr) { return addr[nr >> 3] & (1 << (nr & 7)); } static char * get_inline_addr (struct grub_f2fs_inode *inode) { return (char *) &inode->i_addr[1]; } static grub_uint64_t grub_f2fs_file_size (struct grub_f2fs_inode *inode) { return grub_le_to_cpu64 (inode->i_size); } static grub_uint32_t start_cp_addr (struct grub_f2fs_data *data) { struct grub_f2fs_checkpoint *ckpt = &data->ckpt; grub_uint32_t start_addr = data->cp_blkaddr; if (!(ckpt->checkpoint_ver & grub_cpu_to_le64_compile_time(1))) return start_addr + data->blocks_per_seg; return start_addr; } static grub_uint32_t start_sum_block (struct grub_f2fs_data *data) { struct grub_f2fs_checkpoint *ckpt = &data->ckpt; return start_cp_addr (data) + grub_le_to_cpu32 (ckpt->cp_pack_start_sum); } static grub_uint32_t sum_blk_addr (struct grub_f2fs_data *data, int base, int type) { struct grub_f2fs_checkpoint *ckpt = &data->ckpt; return start_cp_addr (data) + grub_le_to_cpu32 (ckpt->cp_pack_total_block_count) - (base + 1) + type; } static void * nat_bitmap_ptr (struct grub_f2fs_data *data) { struct grub_f2fs_checkpoint *ckpt = &data->ckpt; grub_uint32_t offset; if (grub_le_to_cpu32 (data->sblock.cp_payload) > 0) return ckpt->sit_nat_version_bitmap; offset = grub_le_to_cpu32 (ckpt->sit_ver_bitmap_bytesize); return ckpt->sit_nat_version_bitmap + offset; } static grub_uint32_t get_node_id (struct grub_f2fs_node *rn, int off, int inode_block) { if (inode_block) return grub_le_to_cpu32 (rn->i.i_nid[off - NODE_DIR1_BLOCK]); return grub_le_to_cpu32 (rn->in.nid[off]); } static grub_err_t grub_f2fs_block_read (struct grub_f2fs_data *data, grub_uint32_t blkaddr, void *buf) { return grub_disk_read (data->disk, ((grub_disk_addr_t)blkaddr) << F2FS_BLK_SEC_BITS, 0, F2FS_BLKSIZE, buf); } /* CRC32 */ static grub_uint32_t grub_f2fs_cal_crc32 (const void *buf, const grub_uint32_t len) { grub_uint32_t crc = F2FS_SUPER_MAGIC; unsigned char *p = (unsigned char *)buf; grub_uint32_t tmp = len; int i; while (tmp--) { crc ^= *p++; for (i = 0; i < 8; i++) crc = (crc >> 1) ^ ((crc & 1) ? CRCPOLY_LE : 0); } return crc; } static int grub_f2fs_crc_valid (grub_uint32_t blk_crc, void *buf, const grub_uint32_t len) { grub_uint32_t cal_crc = 0; cal_crc = grub_f2fs_cal_crc32 (buf, len); return (cal_crc == blk_crc) ? 1 : 0; } static int grub_f2fs_test_bit (grub_uint32_t nr, const char *p) { int mask; p += (nr >> 3); mask = 1 << (7 - (nr & 0x07)); return mask & *p; } static int grub_f2fs_sanity_check_sb (struct grub_f2fs_superblock *sb) { grub_uint32_t log_sectorsize, log_sectors_per_block; if (sb->magic != grub_cpu_to_le32_compile_time (F2FS_SUPER_MAGIC)) return -1; if (sb->log_blocksize != grub_cpu_to_le32_compile_time (F2FS_BLK_BITS)) return -1; log_sectorsize = grub_le_to_cpu32 (sb->log_sectorsize); log_sectors_per_block = grub_le_to_cpu32 (sb->log_sectors_per_block); if (log_sectorsize > F2FS_BLK_BITS) return -1; if (log_sectorsize < F2FS_MIN_LOG_SECTOR_SIZE) return -1; if (log_sectors_per_block + log_sectorsize != F2FS_BLK_BITS) return -1; return 0; } static int grub_f2fs_read_sb (struct grub_f2fs_data *data, grub_disk_addr_t offset) { grub_disk_t disk = data->disk; grub_err_t err; /* Read first super block. */ err = grub_disk_read (disk, offset, 0, sizeof (data->sblock), &data->sblock); if (err) return -1; return grub_f2fs_sanity_check_sb (&data->sblock); } static void * validate_checkpoint (struct grub_f2fs_data *data, grub_uint32_t cp_addr, grub_uint64_t *version) { grub_uint32_t *cp_page_1, *cp_page_2; struct grub_f2fs_checkpoint *cp_block; grub_uint64_t cur_version = 0, pre_version = 0; grub_uint32_t crc = 0; grub_uint32_t crc_offset; grub_err_t err; /* Read the 1st cp block in this CP pack. */ cp_page_1 = grub_malloc (F2FS_BLKSIZE); if (!cp_page_1) return NULL; err = grub_f2fs_block_read (data, cp_addr, cp_page_1); if (err) goto invalid_cp1; cp_block = (struct grub_f2fs_checkpoint *)cp_page_1; crc_offset = grub_le_to_cpu32 (cp_block->checksum_offset); if (crc_offset != CHECKSUM_OFFSET) goto invalid_cp1; crc = grub_le_to_cpu32 (*(cp_page_1 + U32_CHECKSUM_OFFSET)); if (!grub_f2fs_crc_valid (crc, cp_block, crc_offset)) goto invalid_cp1; pre_version = grub_le_to_cpu64 (cp_block->checkpoint_ver); /* Read the 2nd cp block in this CP pack. */ cp_page_2 = grub_malloc (F2FS_BLKSIZE); if (!cp_page_2) goto invalid_cp1; cp_addr += grub_le_to_cpu32 (cp_block->cp_pack_total_block_count) - 1; err = grub_f2fs_block_read (data, cp_addr, cp_page_2); if (err) goto invalid_cp2; cp_block = (struct grub_f2fs_checkpoint *)cp_page_2; crc_offset = grub_le_to_cpu32 (cp_block->checksum_offset); if (crc_offset != CHECKSUM_OFFSET) goto invalid_cp2; crc = grub_le_to_cpu32 (*(cp_page_2 + U32_CHECKSUM_OFFSET)); if (!grub_f2fs_crc_valid (crc, cp_block, crc_offset)) goto invalid_cp2; cur_version = grub_le_to_cpu64 (cp_block->checkpoint_ver); if (cur_version == pre_version) { *version = cur_version; grub_free (cp_page_2); return cp_page_1; } invalid_cp2: grub_free (cp_page_2); invalid_cp1: grub_free (cp_page_1); return NULL; } static grub_err_t grub_f2fs_read_cp (struct grub_f2fs_data *data) { void *cp1, *cp2, *cur_page; grub_uint64_t cp1_version = 0, cp2_version = 0; grub_uint64_t cp_start_blk_no; /* * Finding out valid cp block involves read both * sets (cp pack1 and cp pack 2). */ cp_start_blk_no = data->cp_blkaddr; cp1 = validate_checkpoint (data, cp_start_blk_no, &cp1_version); if (!cp1 && grub_errno) return grub_errno; /* The second checkpoint pack should start at the next segment. */ cp_start_blk_no += data->blocks_per_seg; cp2 = validate_checkpoint (data, cp_start_blk_no, &cp2_version); if (!cp2 && grub_errno) { grub_free (cp1); return grub_errno; } if (cp1 && cp2) cur_page = (cp2_version > cp1_version) ? cp2 : cp1; else if (cp1) cur_page = cp1; else if (cp2) cur_page = cp2; else return grub_error (GRUB_ERR_BAD_FS, "no checkpoints"); grub_memcpy (&data->ckpt, cur_page, F2FS_BLKSIZE); grub_free (cp1); grub_free (cp2); return 0; } static grub_err_t get_nat_journal (struct grub_f2fs_data *data) { grub_uint32_t block; char *buf; grub_err_t err; buf = grub_malloc (F2FS_BLKSIZE); if (!buf) return grub_errno; if (CKPT_FLAG_SET(&data->ckpt, CP_COMPACT_SUM_FLAG)) block = start_sum_block (data); else if (CKPT_FLAG_SET (&data->ckpt, CP_UMOUNT_FLAG)) block = sum_blk_addr (data, NR_CURSEG_TYPE, CURSEG_HOT_DATA); else block = sum_blk_addr (data, NR_CURSEG_DATA_TYPE, CURSEG_HOT_DATA); err = grub_f2fs_block_read (data, block, buf); if (err) goto fail; if (CKPT_FLAG_SET (&data->ckpt, CP_COMPACT_SUM_FLAG)) grub_memcpy (&data->nat_j, buf, SUM_JOURNAL_SIZE); else grub_memcpy (&data->nat_j, buf + SUM_ENTRIES_SIZE, SUM_JOURNAL_SIZE); fail: grub_free (buf); return err; } static grub_uint32_t get_blkaddr_from_nat_journal (struct grub_f2fs_data *data, grub_uint32_t nid) { grub_uint16_t n = grub_le_to_cpu16 (data->nat_j.n_nats); grub_uint32_t blkaddr = 0; grub_uint16_t i; for (i = 0; i < n; i++) { if (grub_le_to_cpu32 (data->nat_j.entries[i].nid) == nid) { blkaddr = grub_le_to_cpu32 (data->nat_j.entries[i].ne.block_addr); break; } } return blkaddr; } static grub_uint32_t get_node_blkaddr (struct grub_f2fs_data *data, grub_uint32_t nid) { struct grub_f2fs_nat_block *nat_block; grub_uint32_t seg_off, block_off, entry_off, block_addr; grub_uint32_t blkaddr; grub_err_t err; blkaddr = get_blkaddr_from_nat_journal (data, nid); if (blkaddr) return blkaddr; nat_block = grub_malloc (F2FS_BLKSIZE); if (!nat_block) return 0; block_off = nid / NAT_ENTRY_PER_BLOCK; entry_off = nid % NAT_ENTRY_PER_BLOCK; seg_off = block_off / data->blocks_per_seg; block_addr = data->nat_blkaddr + ((seg_off * data->blocks_per_seg) << 1) + (block_off & (data->blocks_per_seg - 1)); if (grub_f2fs_test_bit (block_off, data->nat_bitmap)) block_addr += data->blocks_per_seg; err = grub_f2fs_block_read (data, block_addr, nat_block); if (err) { grub_free (nat_block); return 0; } blkaddr = grub_le_to_cpu32 (nat_block->ne[entry_off].block_addr); grub_free (nat_block); return blkaddr; } static int grub_get_node_path (struct grub_f2fs_inode *inode, grub_uint32_t block, grub_uint32_t offset[4], grub_uint32_t noffset[4]) { grub_uint32_t direct_blks = ADDRS_PER_BLOCK; grub_uint32_t dptrs_per_blk = NIDS_PER_BLOCK; grub_uint32_t indirect_blks = ADDRS_PER_BLOCK * NIDS_PER_BLOCK; grub_uint32_t dindirect_blks = indirect_blks * NIDS_PER_BLOCK; grub_uint32_t direct_index = DEF_ADDRS_PER_INODE; int n = 0; int level = -1; if (inode->i_inline & F2FS_INLINE_XATTR) direct_index -= F2FS_INLINE_XATTR_ADDRS; noffset[0] = 0; if (block < direct_index) { offset[n] = block; level = 0; goto got; } block -= direct_index; if (block < direct_blks) { offset[n++] = NODE_DIR1_BLOCK; noffset[n] = 1; offset[n] = block; level = 1; goto got; } block -= direct_blks; if (block < direct_blks) { offset[n++] = NODE_DIR2_BLOCK; noffset[n] = 2; offset[n] = block; level = 1; goto got; } block -= direct_blks; if (block < indirect_blks) { offset[n++] = NODE_IND1_BLOCK; noffset[n] = 3; offset[n++] = block / direct_blks; noffset[n] = 4 + offset[n - 1]; offset[n] = block % direct_blks; level = 2; goto got; } block -= indirect_blks; if (block < indirect_blks) { offset[n++] = NODE_IND2_BLOCK; noffset[n] = 4 + dptrs_per_blk; offset[n++] = block / direct_blks; noffset[n] = 5 + dptrs_per_blk + offset[n - 1]; offset[n] = block % direct_blks; level = 2; goto got; } block -= indirect_blks; if (block < dindirect_blks) { offset[n++] = NODE_DIND_BLOCK; noffset[n] = 5 + (dptrs_per_blk * 2); offset[n++] = block / indirect_blks; noffset[n] = 6 + (dptrs_per_blk * 2) + offset[n - 1] * (dptrs_per_blk + 1); offset[n++] = (block / direct_blks) % dptrs_per_blk; noffset[n] = 7 + (dptrs_per_blk * 2) + offset[n - 2] * (dptrs_per_blk + 1) + offset[n - 1]; offset[n] = block % direct_blks; level = 3; goto got; } got: return level; } static grub_err_t grub_f2fs_read_node (struct grub_f2fs_data *data, grub_uint32_t nid, struct grub_f2fs_node *np) { grub_uint32_t blkaddr; blkaddr = get_node_blkaddr (data, nid); if (!blkaddr) return grub_errno; return grub_f2fs_block_read (data, blkaddr, np); } static struct grub_f2fs_data * grub_f2fs_mount (grub_disk_t disk) { struct grub_f2fs_data *data; grub_err_t err; data = grub_malloc (sizeof (*data)); if (!data) return NULL; data->disk = disk; if (grub_f2fs_read_sb (data, F2FS_SUPER_OFFSET0)) { if (grub_f2fs_read_sb (data, F2FS_SUPER_OFFSET1)) { if (grub_errno == GRUB_ERR_NONE) grub_error (GRUB_ERR_BAD_FS, "not a F2FS filesystem (no superblock)"); goto fail; } } data->root_ino = grub_le_to_cpu32 (data->sblock.root_ino); data->cp_blkaddr = grub_le_to_cpu32 (data->sblock.cp_blkaddr); data->nat_blkaddr = grub_le_to_cpu32 (data->sblock.nat_blkaddr); data->blocks_per_seg = 1 << grub_le_to_cpu32 (data->sblock.log_blocks_per_seg); err = grub_f2fs_read_cp (data); if (err) goto fail; data->nat_bitmap = nat_bitmap_ptr (data); err = get_nat_journal (data); if (err) goto fail; data->diropen.data = data; data->diropen.ino = data->root_ino; data->diropen.inode_read = 1; data->inode = &data->diropen.inode; err = grub_f2fs_read_node (data, data->root_ino, data->inode); if (err) goto fail; return data; fail: grub_free (data); return NULL; } /* Guarantee inline_data was handled by caller. */ static grub_disk_addr_t grub_f2fs_get_block (grub_fshelp_node_t node, grub_disk_addr_t block_ofs) { struct grub_f2fs_data *data = node->data; struct grub_f2fs_inode *inode = &node->inode.i; grub_uint32_t offset[4], noffset[4], nids[4]; struct grub_f2fs_node *node_block; grub_uint32_t block_addr = -1; int level, i; level = grub_get_node_path (inode, block_ofs, offset, noffset); if (level < 0) return -1; if (level == 0) return grub_le_to_cpu32 (inode->i_addr[offset[0]]); node_block = grub_malloc (F2FS_BLKSIZE); if (!node_block) return -1; nids[1] = get_node_id (&node->inode, offset[0], 1); /* Get indirect or direct nodes. */ for (i = 1; i <= level; i++) { grub_f2fs_read_node (data, nids[i], node_block); if (grub_errno) goto fail; if (i < level) nids[i + 1] = get_node_id (node_block, offset[i], 0); } block_addr = grub_le_to_cpu32 (node_block->dn.addr[offset[level]]); fail: grub_free (node_block); return block_addr; } static grub_ssize_t grub_f2fs_read_file (grub_fshelp_node_t node, grub_disk_read_hook_t read_hook, void *read_hook_data, grub_off_t pos, grub_size_t len, char *buf) { struct grub_f2fs_inode *inode = &node->inode.i; grub_off_t filesize = grub_f2fs_file_size (inode); char *inline_addr = get_inline_addr (inode); if (inode->i_inline & F2FS_INLINE_DATA) { if (filesize > MAX_INLINE_DATA) return -1; if (len > filesize - pos) len = filesize - pos; grub_memcpy (buf, inline_addr + pos, len); return len; } return grub_fshelp_read_file (node->data->disk, node, read_hook, read_hook_data, pos, len, buf, grub_f2fs_get_block, filesize, F2FS_BLK_SEC_BITS, 0); } static char * grub_f2fs_read_symlink (grub_fshelp_node_t node) { char *symlink; struct grub_fshelp_node *diro = node; grub_uint64_t filesize; if (!diro->inode_read) { grub_f2fs_read_node (diro->data, diro->ino, &diro->inode); if (grub_errno) return 0; } filesize = grub_f2fs_file_size(&diro->inode.i); symlink = grub_malloc (filesize + 1); if (!symlink) return 0; grub_f2fs_read_file (diro, 0, 0, 0, filesize, symlink); if (grub_errno) { grub_free (symlink); return 0; } symlink[filesize] = '\0'; return symlink; } static int grub_f2fs_check_dentries (struct grub_f2fs_dir_iter_ctx *ctx) { struct grub_fshelp_node *fdiro; int i; for (i = 0; i < ctx->max;) { char *filename; enum grub_fshelp_filetype type = GRUB_FSHELP_UNKNOWN; enum FILE_TYPE ftype; int name_len; int ret; if (grub_f2fs_test_bit_le (i, ctx->bitmap) == 0) { i++; continue; } ftype = ctx->dentry[i].file_type; name_len = grub_le_to_cpu16 (ctx->dentry[i].name_len); filename = grub_malloc (name_len + 1); if (!filename) return 0; grub_memcpy (filename, ctx->filename[i], name_len); filename[name_len] = 0; fdiro = grub_malloc (sizeof (struct grub_fshelp_node)); if (!fdiro) { grub_free(filename); return 0; } if (ftype == F2FS_FT_DIR) type = GRUB_FSHELP_DIR; else if (ftype == F2FS_FT_SYMLINK) type = GRUB_FSHELP_SYMLINK; else if (ftype == F2FS_FT_REG_FILE) type = GRUB_FSHELP_REG; fdiro->data = ctx->data; fdiro->ino = grub_le_to_cpu32 (ctx->dentry[i].ino); fdiro->inode_read = 0; ret = ctx->hook (filename, type, fdiro, ctx->hook_data); grub_free(filename); if (ret) return 1; i += (name_len + F2FS_SLOT_LEN - 1) / F2FS_SLOT_LEN; } return 0; } static int grub_f2fs_iterate_inline_dir (struct grub_f2fs_inode *dir, struct grub_f2fs_dir_iter_ctx *ctx) { struct grub_f2fs_inline_dentry *de_blk; de_blk = (struct grub_f2fs_inline_dentry *) get_inline_addr (dir); ctx->bitmap = de_blk->dentry_bitmap; ctx->dentry = de_blk->dentry; ctx->filename = de_blk->filename; ctx->max = NR_INLINE_DENTRY; return grub_f2fs_check_dentries (ctx); } static int grub_f2fs_iterate_dir (grub_fshelp_node_t dir, grub_fshelp_iterate_dir_hook_t hook, void *hook_data) { struct grub_fshelp_node *diro = (struct grub_fshelp_node *) dir; struct grub_f2fs_inode *inode; struct grub_f2fs_dir_iter_ctx ctx = { .data = diro->data, .hook = hook, .hook_data = hook_data }; grub_off_t fpos = 0; if (!diro->inode_read) { grub_f2fs_read_node (diro->data, diro->ino, &diro->inode); if (grub_errno) return 0; } inode = &diro->inode.i; if (inode->i_inline & F2FS_INLINE_DENTRY) return grub_f2fs_iterate_inline_dir (inode, &ctx); while (fpos < grub_f2fs_file_size (inode)) { struct grub_f2fs_dentry_block *de_blk; char *buf; int ret; buf = grub_zalloc (F2FS_BLKSIZE); if (!buf) return 0; grub_f2fs_read_file (diro, 0, 0, fpos, F2FS_BLKSIZE, buf); if (grub_errno) { grub_free (buf); return 0; } de_blk = (struct grub_f2fs_dentry_block *) buf; ctx.bitmap = de_blk->dentry_bitmap; ctx.dentry = de_blk->dentry; ctx.filename = de_blk->filename; ctx.max = NR_DENTRY_IN_BLOCK; ret = grub_f2fs_check_dentries (&ctx); grub_free (buf); if (ret) return 1; fpos += F2FS_BLKSIZE; } return 0; } static int grub_f2fs_dir_iter (const char *filename, enum grub_fshelp_filetype filetype, grub_fshelp_node_t node, void *data) { struct grub_f2fs_dir_ctx *ctx = data; struct grub_dirhook_info info; grub_memset (&info, 0, sizeof (info)); if (!node->inode_read) { grub_f2fs_read_node (ctx->data, node->ino, &node->inode); if (!grub_errno) node->inode_read = 1; grub_errno = GRUB_ERR_NONE; } if (node->inode_read) { info.mtimeset = 1; info.mtime = grub_le_to_cpu64 (node->inode.i.i_mtime); } info.dir = ((filetype & GRUB_FSHELP_TYPE_MASK) == GRUB_FSHELP_DIR); grub_free (node); return ctx->hook (filename, &info, ctx->hook_data); } static grub_err_t grub_f2fs_dir (grub_device_t device, const char *path, grub_fs_dir_hook_t hook, void *hook_data) { struct grub_f2fs_dir_ctx ctx = { .hook = hook, .hook_data = hook_data }; struct grub_fshelp_node *fdiro = 0; grub_dl_ref (my_mod); ctx.data = grub_f2fs_mount (device->disk); if (!ctx.data) goto fail; grub_fshelp_find_file (path, &ctx.data->diropen, &fdiro, grub_f2fs_iterate_dir, grub_f2fs_read_symlink, GRUB_FSHELP_DIR); if (grub_errno) goto fail; grub_f2fs_iterate_dir (fdiro, grub_f2fs_dir_iter, &ctx); fail: if (fdiro != &ctx.data->diropen) grub_free (fdiro); grub_free (ctx.data); grub_dl_unref (my_mod); return grub_errno; } /* Open a file named NAME and initialize FILE. */ static grub_err_t grub_f2fs_open (struct grub_file *file, const char *name) { struct grub_f2fs_data *data = NULL; struct grub_fshelp_node *fdiro = 0; struct grub_f2fs_inode *inode; grub_dl_ref (my_mod); data = grub_f2fs_mount (file->device->disk); if (!data) goto fail; grub_fshelp_find_file (name, &data->diropen, &fdiro, grub_f2fs_iterate_dir, grub_f2fs_read_symlink, GRUB_FSHELP_REG); if (grub_errno) goto fail; if (!fdiro->inode_read) { grub_f2fs_read_node (data, fdiro->ino, &fdiro->inode); if (grub_errno) goto fail; } grub_memcpy (data->inode, &fdiro->inode, sizeof (*data->inode)); grub_free (fdiro); inode = &(data->inode->i); file->size = grub_f2fs_file_size (inode); file->data = data; file->offset = 0; if (inode->i_inline & F2FS_INLINE_DATA && file->size > MAX_INLINE_DATA) grub_error (GRUB_ERR_BAD_FS, "corrupted inline_data: need fsck"); return 0; fail: if (fdiro != &data->diropen) grub_free (fdiro); grub_free (data); grub_dl_unref (my_mod); return grub_errno; } static grub_ssize_t grub_f2fs_read (grub_file_t file, char *buf, grub_size_t len) { struct grub_f2fs_data *data = (struct grub_f2fs_data *) file->data; return grub_f2fs_read_file (&data->diropen, file->read_hook, file->read_hook_data, file->offset, len, buf); } static grub_err_t grub_f2fs_close (grub_file_t file) { struct grub_f2fs_data *data = (struct grub_f2fs_data *) file->data; grub_free (data); grub_dl_unref (my_mod); return GRUB_ERR_NONE; } static grub_uint8_t * grub_f2fs_utf16_to_utf8 (grub_uint16_t *in_buf_le) { grub_uint16_t in_buf[MAX_VOLUME_NAME]; grub_uint8_t *out_buf; int len = 0; out_buf = grub_malloc (MAX_VOLUME_NAME * GRUB_MAX_UTF8_PER_UTF16 + 1); if (!out_buf) return NULL; while (*in_buf_le != 0 && len < MAX_VOLUME_NAME) { in_buf[len] = grub_le_to_cpu16 (in_buf_le[len]); len++; } *grub_utf16_to_utf8 (out_buf, in_buf, len) = '\0'; return out_buf; } #if __GNUC__ >= 9 #pragma GCC diagnostic push #pragma GCC diagnostic ignored "-Waddress-of-packed-member" #endif static grub_err_t grub_f2fs_label (grub_device_t device, char **label) { struct grub_f2fs_data *data; grub_disk_t disk = device->disk; grub_dl_ref (my_mod); data = grub_f2fs_mount (disk); if (data) *label = (char *) grub_f2fs_utf16_to_utf8 (data->sblock.volume_name); else *label = NULL; grub_free (data); grub_dl_unref (my_mod); return grub_errno; } #if __GNUC__ >= 9 #pragma GCC diagnostic pop #endif static grub_err_t grub_f2fs_uuid (grub_device_t device, char **uuid) { struct grub_f2fs_data *data; grub_disk_t disk = device->disk; grub_dl_ref (my_mod); data = grub_f2fs_mount (disk); if (data) { *uuid = grub_xasprintf ("%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", data->sblock.uuid[0], data->sblock.uuid[1], data->sblock.uuid[2], data->sblock.uuid[3], data->sblock.uuid[4], data->sblock.uuid[5], data->sblock.uuid[6], data->sblock.uuid[7], data->sblock.uuid[8], data->sblock.uuid[9], data->sblock.uuid[10], data->sblock.uuid[11], data->sblock.uuid[12], data->sblock.uuid[13], data->sblock.uuid[14], data->sblock.uuid[15]); } else *uuid = NULL; grub_free (data); grub_dl_unref (my_mod); return grub_errno; } static struct grub_fs grub_f2fs_fs = { .name = "f2fs", .fs_dir = grub_f2fs_dir, .fs_open = grub_f2fs_open, .fs_read = grub_f2fs_read, .fs_close = grub_f2fs_close, .fs_label = grub_f2fs_label, .fs_uuid = grub_f2fs_uuid, #ifdef GRUB_UTIL .reserved_first_sector = 1, .blocklist_install = 0, #endif .next = 0 }; GRUB_MOD_INIT (f2fs) { grub_fs_register (&grub_f2fs_fs); my_mod = mod; } GRUB_MOD_FINI (f2fs) { grub_fs_unregister (&grub_f2fs_fs); }