errcode_t ext2fs_write_dir_block(ext2_filsys fs, blk_t block, void *inbuf) { errcode_t retval; char *p, *end, *write_buf; char *buf = 0; struct ext2_dir_entry *dirent; if ((fs->flags & EXT2_FLAG_SWAP_BYTES) || (fs->flags & EXT2_FLAG_SWAP_BYTES_WRITE)) { write_buf = buf = malloc(fs->blocksize); if (!buf) return ENOMEM; memcpy(buf, inbuf, fs->blocksize); p = buf; end = buf + fs->blocksize; while (p < end) { dirent = (struct ext2_dir_entry *) p; p += (dirent->rec_len < 8) ? 8 : dirent->rec_len; dirent->inode = ext2fs_swab32(dirent->inode); dirent->rec_len = ext2fs_swab16(dirent->rec_len); dirent->name_len = ext2fs_swab16(dirent->name_len); } } else write_buf = inbuf; retval = io_channel_write_blk(fs->io, block, 1, write_buf); if (buf) free(buf); return retval; }
void ext2fs_swap_group_desc2(ext2_filsys fs, struct ext2_group_desc *gdp) { /* Do the 32-bit parts first */ gdp->bg_block_bitmap = ext2fs_swab32(gdp->bg_block_bitmap); gdp->bg_inode_bitmap = ext2fs_swab32(gdp->bg_inode_bitmap); gdp->bg_inode_table = ext2fs_swab32(gdp->bg_inode_table); gdp->bg_free_blocks_count = ext2fs_swab16(gdp->bg_free_blocks_count); gdp->bg_free_inodes_count = ext2fs_swab16(gdp->bg_free_inodes_count); gdp->bg_used_dirs_count = ext2fs_swab16(gdp->bg_used_dirs_count); gdp->bg_flags = ext2fs_swab16(gdp->bg_flags); gdp->bg_itable_unused = ext2fs_swab16(gdp->bg_itable_unused); gdp->bg_checksum = ext2fs_swab16(gdp->bg_checksum); /* If we're 32-bit, we're done */ if (fs && (!fs->super->s_desc_size || (fs->super->s_desc_size < EXT2_MIN_DESC_SIZE_64BIT))) return; /* Swap the 64-bit parts */ struct ext4_group_desc *gdp4 = (struct ext4_group_desc *) gdp; gdp4->bg_block_bitmap_hi = ext2fs_swab32(gdp4->bg_block_bitmap_hi); gdp4->bg_inode_bitmap_hi = ext2fs_swab32(gdp4->bg_inode_bitmap_hi); gdp4->bg_inode_table_hi = ext2fs_swab32(gdp4->bg_inode_table_hi); gdp4->bg_free_blocks_count_hi = ext2fs_swab16(gdp4->bg_free_blocks_count_hi); gdp4->bg_free_inodes_count_hi = ext2fs_swab16(gdp4->bg_free_inodes_count_hi); gdp4->bg_used_dirs_count_hi = ext2fs_swab16(gdp4->bg_used_dirs_count_hi); gdp4->bg_itable_unused_hi = ext2fs_swab16(gdp4->bg_itable_unused_hi); }
void ext2fs_swap_group_desc(struct ext2_group_desc *gdp) { gdp->bg_block_bitmap = ext2fs_swab32(gdp->bg_block_bitmap); gdp->bg_inode_bitmap = ext2fs_swab32(gdp->bg_inode_bitmap); gdp->bg_inode_table = ext2fs_swab32(gdp->bg_inode_table); gdp->bg_free_blocks_count = ext2fs_swab16(gdp->bg_free_blocks_count); gdp->bg_free_inodes_count = ext2fs_swab16(gdp->bg_free_inodes_count); gdp->bg_used_dirs_count = ext2fs_swab16(gdp->bg_used_dirs_count); }
errcode_t ext2fs_write_dir_block2(ext2_filsys fs, blk_t block, void *inbuf, int flags EXT2FS_ATTR((unused))) { #if BB_BIG_ENDIAN int do_swap = 0; errcode_t retval; char *p, *end; char *buf = 0; struct ext2_dir_entry *dirent; if ((fs->flags & EXT2_FLAG_SWAP_BYTES) || (fs->flags & EXT2_FLAG_SWAP_BYTES_WRITE)) do_swap = 1; #ifndef WORDS_BIGENDIAN if (!do_swap) return io_channel_write_blk(fs->io, block, 1, (char *) inbuf); #endif retval = ext2fs_get_mem(fs->blocksize, &buf); if (retval) return retval; memcpy(buf, inbuf, fs->blocksize); p = buf; end = buf + fs->blocksize; while (p < end) { dirent = (struct ext2_dir_entry *) p; if ((dirent->rec_len < 8) || (dirent->rec_len % 4)) { ext2fs_free_mem(&buf); return EXT2_ET_DIR_CORRUPTED; } p += dirent->rec_len; if (do_swap) { dirent->inode = ext2fs_swab32(dirent->inode); dirent->rec_len = ext2fs_swab16(dirent->rec_len); dirent->name_len = ext2fs_swab16(dirent->name_len); } #ifdef WORDS_BIGENDIAN if (flags & EXT2_DIRBLOCK_V2_STRUCT) dirent->name_len = ext2fs_swab16(dirent->name_len); #endif } retval = io_channel_write_blk(fs->io, block, 1, buf); ext2fs_free_mem(&buf); return retval; #else return io_channel_write_blk(fs->io, block, 1, (char *) inbuf); #endif }
void ext2fs_swap_ext_attr(ext2_filsys fs, char *to, char *from) { struct ext2_ext_attr_header *from_header = (struct ext2_ext_attr_header *)from; struct ext2_ext_attr_header *to_header = (struct ext2_ext_attr_header *)to; struct ext2_ext_attr_entry *from_entry, *to_entry; char *from_end = (char *)from_header + fs->blocksize; int n; if (to_header != from_header) memcpy(to_header, from_header, fs->blocksize); to_header->h_magic = ext2fs_swab32(from_header->h_magic); to_header->h_blocks = ext2fs_swab32(from_header->h_blocks); to_header->h_refcount = ext2fs_swab32(from_header->h_refcount); for (n=0; n<4; n++) to_header->h_reserved[n] = ext2fs_swab32(from_header->h_reserved[n]); from_entry = (struct ext2_ext_attr_entry *)(from_header+1); to_entry = (struct ext2_ext_attr_entry *)(to_header+1); while ((char *)from_entry < from_end && *(__u32 *)from_entry) { to_entry->e_value_offs = ext2fs_swab16(from_entry->e_value_offs); to_entry->e_value_block = ext2fs_swab32(from_entry->e_value_block); to_entry->e_value_size = ext2fs_swab32(from_entry->e_value_size); from_entry = EXT2_EXT_ATTR_NEXT(from_entry); to_entry = EXT2_EXT_ATTR_NEXT(to_entry); } }
void ext2fs_swap_mmp(struct mmp_struct *mmp) { mmp->mmp_magic = ext2fs_swab32(mmp->mmp_magic); mmp->mmp_seq = ext2fs_swab32(mmp->mmp_seq); mmp->mmp_time = ext2fs_swab64(mmp->mmp_time); mmp->mmp_check_interval = ext2fs_swab16(mmp->mmp_check_interval); }
int main(int argc, char **argv) { int i; int errors = 0; printf("Testing ext2fs_swab16\n"); i=0; do { printf("swab16(0x%04x) = 0x%04x\n", test1[i], ext2fs_swab16(test1[i])); if (ext2fs_swab16(test1[i]) != test1[i+1]) { printf("Error!!! %04x != %04x\n", ext2fs_swab16(test1[i]), test1[i+1]); errors++; } if (ext2fs_swab16(test1[i+1]) != test1[i]) { printf("Error!!! %04x != %04x\n", ext2fs_swab16(test1[i+1]), test1[i]); errors++; } i += 2; } while (test1[i] != 0); printf("Testing ext2fs_swab32\n"); i = 0; do { printf("swab32(0x%08x) = 0x%08x\n", test2[i], ext2fs_swab32(test2[i])); if (ext2fs_swab32(test2[i]) != test2[i+1]) { printf("Error!!! %04x != %04x\n", ext2fs_swab32(test2[i]), test2[i+1]); errors++; } if (ext2fs_swab32(test2[i+1]) != test2[i]) { printf("Error!!! %04x != %04x\n", ext2fs_swab32(test2[i+1]), test2[i]); errors++; } i += 2; } while (test2[i] != 0); if (!errors) printf("No errors found in the byteswap implementation!\n"); return errors; }
void ext2fs_swap_ext_attr_entry(struct ext2_ext_attr_entry *to_entry, struct ext2_ext_attr_entry *from_entry) { to_entry->e_value_offs = ext2fs_swab16(from_entry->e_value_offs); to_entry->e_value_block = ext2fs_swab32(from_entry->e_value_block); to_entry->e_value_size = ext2fs_swab32(from_entry->e_value_size); to_entry->e_hash = ext2fs_swab32(from_entry->e_hash); }
errcode_t ext2fs_read_dir_block2(ext2_filsys fs, blk_t block, void *buf, int flags EXT2FS_ATTR((unused))) { errcode_t retval; char *p, *end; struct ext2_dir_entry *dirent; unsigned int name_len, rec_len; #if BB_BIG_ENDIAN unsigned int do_swap; #endif retval = io_channel_read_blk(fs->io, block, 1, buf); if (retval) return retval; #if BB_BIG_ENDIAN do_swap = (fs->flags & (EXT2_FLAG_SWAP_BYTES| EXT2_FLAG_SWAP_BYTES_READ)) != 0; #endif p = (char *) buf; end = (char *) buf + fs->blocksize; while (p < end-8) { dirent = (struct ext2_dir_entry *) p; #if BB_BIG_ENDIAN if (do_swap) { dirent->inode = ext2fs_swab32(dirent->inode); dirent->rec_len = ext2fs_swab16(dirent->rec_len); dirent->name_len = ext2fs_swab16(dirent->name_len); } #endif name_len = dirent->name_len; #ifdef WORDS_BIGENDIAN if (flags & EXT2_DIRBLOCK_V2_STRUCT) dirent->name_len = ext2fs_swab16(dirent->name_len); #endif rec_len = dirent->rec_len; if ((rec_len < 8) || (rec_len % 4)) { rec_len = 8; retval = EXT2_ET_DIR_CORRUPTED; } if (((name_len & 0xFF) + 8) > dirent->rec_len) retval = EXT2_ET_DIR_CORRUPTED; p += rec_len; } return retval; }
void ext2fs_swap_super(struct ext2_super_block * sb) { int i; sb->s_inodes_count = ext2fs_swab32(sb->s_inodes_count); sb->s_blocks_count = ext2fs_swab32(sb->s_blocks_count); sb->s_r_blocks_count = ext2fs_swab32(sb->s_r_blocks_count); sb->s_free_blocks_count = ext2fs_swab32(sb->s_free_blocks_count); sb->s_free_inodes_count = ext2fs_swab32(sb->s_free_inodes_count); sb->s_first_data_block = ext2fs_swab32(sb->s_first_data_block); sb->s_log_block_size = ext2fs_swab32(sb->s_log_block_size); sb->s_log_frag_size = ext2fs_swab32(sb->s_log_frag_size); sb->s_blocks_per_group = ext2fs_swab32(sb->s_blocks_per_group); sb->s_frags_per_group = ext2fs_swab32(sb->s_frags_per_group); sb->s_inodes_per_group = ext2fs_swab32(sb->s_inodes_per_group); sb->s_mtime = ext2fs_swab32(sb->s_mtime); sb->s_wtime = ext2fs_swab32(sb->s_wtime); sb->s_mnt_count = ext2fs_swab16(sb->s_mnt_count); sb->s_max_mnt_count = ext2fs_swab16(sb->s_max_mnt_count); sb->s_magic = ext2fs_swab16(sb->s_magic); sb->s_state = ext2fs_swab16(sb->s_state); sb->s_errors = ext2fs_swab16(sb->s_errors); sb->s_minor_rev_level = ext2fs_swab16(sb->s_minor_rev_level); sb->s_lastcheck = ext2fs_swab32(sb->s_lastcheck); sb->s_checkinterval = ext2fs_swab32(sb->s_checkinterval); sb->s_creator_os = ext2fs_swab32(sb->s_creator_os); sb->s_rev_level = ext2fs_swab32(sb->s_rev_level); sb->s_def_resuid = ext2fs_swab16(sb->s_def_resuid); sb->s_def_resgid = ext2fs_swab16(sb->s_def_resgid); sb->s_first_ino = ext2fs_swab32(sb->s_first_ino); sb->s_inode_size = ext2fs_swab16(sb->s_inode_size); sb->s_block_group_nr = ext2fs_swab16(sb->s_block_group_nr); sb->s_feature_compat = ext2fs_swab32(sb->s_feature_compat); sb->s_feature_incompat = ext2fs_swab32(sb->s_feature_incompat); sb->s_feature_ro_compat = ext2fs_swab32(sb->s_feature_ro_compat); sb->s_algorithm_usage_bitmap = ext2fs_swab32(sb->s_algorithm_usage_bitmap); sb->s_journal_inum = ext2fs_swab32(sb->s_journal_inum); sb->s_journal_dev = ext2fs_swab32(sb->s_journal_dev); sb->s_last_orphan = ext2fs_swab32(sb->s_last_orphan); sb->s_first_meta_bg = ext2fs_swab32(sb->s_first_meta_bg); for (i=0; i < 4; i++) sb->s_hash_seed[i] = ext2fs_swab32(sb->s_hash_seed[i]); }
errcode_t ext2fs_write_dir_block3(ext2_filsys fs, blk64_t block, void *inbuf, int flags EXT2FS_ATTR((unused))) { #ifdef WORDS_BIGENDIAN errcode_t retval; char *p, *end; char *buf = 0; unsigned int rec_len; struct ext2_dir_entry *dirent; retval = ext2fs_get_mem(fs->blocksize, &buf); if (retval) return retval; memcpy(buf, inbuf, fs->blocksize); p = buf; end = buf + fs->blocksize; while (p < end) { dirent = (struct ext2_dir_entry *) p; if ((retval = ext2fs_get_rec_len(fs, dirent, &rec_len)) != 0) return retval; if ((rec_len < 8) || (rec_len % 4)) { ext2fs_free_mem(&buf); return (EXT2_ET_DIR_CORRUPTED); } p += rec_len; dirent->inode = ext2fs_swab32(dirent->inode); dirent->rec_len = ext2fs_swab16(dirent->rec_len); dirent->name_len = ext2fs_swab16(dirent->name_len); if (flags & EXT2_DIRBLOCK_V2_STRUCT) dirent->name_len = ext2fs_swab16(dirent->name_len); } retval = io_channel_write_blk64(fs->io, block, 1, buf); ext2fs_free_mem(&buf); return retval; #else return io_channel_write_blk(fs->io, block, 1, (char *) inbuf); #endif }
errcode_t ext2fs_read_dir_block3(ext2_filsys fs, blk64_t block, void *buf, int flags EXT2FS_ATTR((unused))) { errcode_t retval; char *p, *end; struct ext2_dir_entry *dirent; unsigned int name_len, rec_len; retval = io_channel_read_blk64(fs->io, block, 1, buf); if (retval) return retval; p = (char *) buf; end = (char *) buf + fs->blocksize; while (p < end-8) { dirent = (struct ext2_dir_entry *) p; #ifdef WORDS_BIGENDIAN dirent->inode = ext2fs_swab32(dirent->inode); dirent->rec_len = ext2fs_swab16(dirent->rec_len); dirent->name_len = ext2fs_swab16(dirent->name_len); #endif name_len = dirent->name_len; #ifdef WORDS_BIGENDIAN if (flags & EXT2_DIRBLOCK_V2_STRUCT) dirent->name_len = ext2fs_swab16(dirent->name_len); #endif if ((retval = ext2fs_get_rec_len(fs, dirent, &rec_len)) != 0) return retval; if ((rec_len < 8) || (rec_len % 4)) { rec_len = 8; retval = EXT2_ET_DIR_CORRUPTED; } else if (((name_len & 0xFF) + 8) > rec_len) retval = EXT2_ET_DIR_CORRUPTED; p += rec_len; } return retval; }
errcode_t ext2fs_read_dir_block(ext2_filsys fs, blk_t block, void *buf) { errcode_t retval; char *p, *end; struct ext2_dir_entry *dirent; retval = io_channel_read_blk(fs->io, block, 1, buf); if (retval) return retval; if ((fs->flags & (EXT2_FLAG_SWAP_BYTES| EXT2_FLAG_SWAP_BYTES_READ)) == 0) return 0; p = buf; end = (char *) buf + fs->blocksize; while (p < end) { dirent = (struct ext2_dir_entry *) p; dirent->inode = ext2fs_swab32(dirent->inode); dirent->rec_len = ext2fs_swab16(dirent->rec_len); dirent->name_len = ext2fs_swab16(dirent->name_len); p += (dirent->rec_len < 8) ? 8 : dirent->rec_len; } return 0; }
static errcode_t write_backup_super(ext2_filsys fs, dgrp_t group, blk_t group_block, struct ext2_super_block *super_shadow) { dgrp_t sgrp = group; if (sgrp > ((1 << 16) - 1)) sgrp = (1 << 16) - 1; #if defined(WORDS_BIGENDIAN) || (BYTE_ORDER == BIG_ENDIAN) super_shadow->s_block_group_nr = ext2fs_swab16(sgrp); #else fs->super->s_block_group_nr = sgrp; #endif return io_channel_write_blk(fs->io, group_block, -SUPERBLOCK_SIZE, super_shadow); }
static errcode_t write_backup_super(ext2_filsys fs, dgrp_t group, blk_t group_block, struct ext2_super_block *super_shadow) { dgrp_t sgrp = group; if (sgrp > ((1 << 16) - 1)) sgrp = (1 << 16) - 1; #if BB_BIG_ENDIAN if (fs->flags & EXT2_FLAG_SWAP_BYTES) super_shadow->s_block_group_nr = ext2fs_swab16(sgrp); else #endif fs->super->s_block_group_nr = sgrp; return io_channel_write_blk(fs->io, group_block, -SUPERBLOCK_SIZE, super_shadow); }
void ext2fs_swap_inode(ext2_filsys fs, struct ext2_inode *t, struct ext2_inode *f, int hostorder) { unsigned i; int islnk = 0; if (hostorder && LINUX_S_ISLNK(f->i_mode)) islnk = 1; t->i_mode = ext2fs_swab16(f->i_mode); if (!hostorder && LINUX_S_ISLNK(t->i_mode)) islnk = 1; t->i_uid = ext2fs_swab16(f->i_uid); t->i_size = ext2fs_swab32(f->i_size); t->i_atime = ext2fs_swab32(f->i_atime); t->i_ctime = ext2fs_swab32(f->i_ctime); t->i_mtime = ext2fs_swab32(f->i_mtime); t->i_dtime = ext2fs_swab32(f->i_dtime); t->i_gid = ext2fs_swab16(f->i_gid); t->i_links_count = ext2fs_swab16(f->i_links_count); t->i_blocks = ext2fs_swab32(f->i_blocks); t->i_flags = ext2fs_swab32(f->i_flags); if (!islnk || f->i_blocks) { for (i = 0; i < EXT2_N_BLOCKS; i++) t->i_block[i] = ext2fs_swab32(f->i_block[i]); } else if (t != f) { for (i = 0; i < EXT2_N_BLOCKS; i++) t->i_block[i] = f->i_block[i]; } t->i_generation = ext2fs_swab32(f->i_generation); t->i_file_acl = ext2fs_swab32(f->i_file_acl); t->i_dir_acl = ext2fs_swab32(f->i_dir_acl); t->i_faddr = ext2fs_swab32(f->i_faddr); switch (fs->super->s_creator_os) { case EXT2_OS_LINUX: t->osd1.linux1.l_i_reserved1 = ext2fs_swab32(f->osd1.linux1.l_i_reserved1); t->osd2.linux2.l_i_frag = f->osd2.linux2.l_i_frag; t->osd2.linux2.l_i_fsize = f->osd2.linux2.l_i_fsize; t->osd2.linux2.i_pad1 = ext2fs_swab16(f->osd2.linux2.i_pad1); t->osd2.linux2.l_i_uid_high = ext2fs_swab16 (f->osd2.linux2.l_i_uid_high); t->osd2.linux2.l_i_gid_high = ext2fs_swab16 (f->osd2.linux2.l_i_gid_high); t->osd2.linux2.l_i_reserved2 = ext2fs_swab32(f->osd2.linux2.l_i_reserved2); break; case EXT2_OS_HURD: t->osd1.hurd1.h_i_translator = ext2fs_swab32 (f->osd1.hurd1.h_i_translator); t->osd2.hurd2.h_i_frag = f->osd2.hurd2.h_i_frag; t->osd2.hurd2.h_i_fsize = f->osd2.hurd2.h_i_fsize; t->osd2.hurd2.h_i_mode_high = ext2fs_swab16 (f->osd2.hurd2.h_i_mode_high); t->osd2.hurd2.h_i_uid_high = ext2fs_swab16 (f->osd2.hurd2.h_i_uid_high); t->osd2.hurd2.h_i_gid_high = ext2fs_swab16 (f->osd2.hurd2.h_i_gid_high); t->osd2.hurd2.h_i_author = ext2fs_swab32 (f->osd2.hurd2.h_i_author); break; case EXT2_OS_MASIX: t->osd1.masix1.m_i_reserved1 = ext2fs_swab32(f->osd1.masix1.m_i_reserved1); t->osd2.masix2.m_i_frag = f->osd2.masix2.m_i_frag; t->osd2.masix2.m_i_fsize = f->osd2.masix2.m_i_fsize; t->osd2.masix2.m_pad1 = ext2fs_swab16(f->osd2.masix2.m_pad1); t->osd2.masix2.m_i_reserved2[0] = ext2fs_swab32(f->osd2.masix2.m_i_reserved2[0]); t->osd2.masix2.m_i_reserved2[1] = ext2fs_swab32(f->osd2.masix2.m_i_reserved2[1]); break; } }
static void dump_journal(char *cmdname, FILE *out_file, struct journal_source *source) { struct ext2_super_block *sb; char jsb_buffer[1024]; char buf[8192]; journal_superblock_t *jsb; unsigned int blocksize = 1024; unsigned int got; int retval; __u32 magic, sequence, blocktype; journal_header_t *header; tid_t transaction; unsigned int blocknr = 0; /* First, check to see if there's an ext2 superblock header */ retval = read_journal_block(cmdname, source, 0, buf, 2048, &got); if (retval) return; jsb = (journal_superblock_t *) buf; sb = (struct ext2_super_block *) (buf+1024); #ifdef ENABLE_SWAPFS if (sb->s_magic == ext2fs_swab16(EXT2_SUPER_MAGIC)) ext2fs_swap_super(sb); #endif if ((be32_to_cpu(jsb->s_header.h_magic) != JFS_MAGIC_NUMBER) && (sb->s_magic == EXT2_SUPER_MAGIC) && (sb->s_feature_incompat & EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) { blocksize = EXT2_BLOCK_SIZE(sb); blocknr = (blocksize == 1024) ? 2 : 1; uuid_unparse(sb->s_uuid, jsb_buffer); fprintf(out_file, "Ext2 superblock header found.\n"); if (dump_all) { fprintf(out_file, "\tuuid=%s\n", jsb_buffer); fprintf(out_file, "\tblocksize=%d\n", blocksize); fprintf(out_file, "\tjournal data size %ld\n", (long) sb->s_blocks_count); } } /* Next, read the journal superblock */ retval = read_journal_block(cmdname, source, blocknr*blocksize, jsb_buffer, 1024, &got); if (retval) return; jsb = (journal_superblock_t *) jsb_buffer; if (be32_to_cpu(jsb->s_header.h_magic) != JFS_MAGIC_NUMBER) { fprintf(out_file, "Journal superblock magic number invalid!\n"); return; } blocksize = be32_to_cpu(jsb->s_blocksize); transaction = be32_to_cpu(jsb->s_sequence); blocknr = be32_to_cpu(jsb->s_start); fprintf(out_file, "Journal starts at block %u, transaction %u\n", blocknr, transaction); if (!blocknr) /* Empty journal, nothing to do. */ return; while (1) { retval = read_journal_block(cmdname, source, blocknr*blocksize, buf, blocksize, &got); if (retval || got != blocksize) return; header = (journal_header_t *) buf; magic = be32_to_cpu(header->h_magic); sequence = be32_to_cpu(header->h_sequence); blocktype = be32_to_cpu(header->h_blocktype); if (magic != JFS_MAGIC_NUMBER) { fprintf (out_file, "No magic number at block %u: " "end of journal.\n", blocknr); return; } if (sequence != transaction) { fprintf (out_file, "Found sequence %u (not %u) at " "block %u: end of journal.\n", sequence, transaction, blocknr); return; } if (dump_descriptors) { fprintf (out_file, "Found expected sequence %u, " "type %u (%s) at block %u\n", sequence, blocktype, type_to_name(blocktype), blocknr); } switch (blocktype) { case JFS_DESCRIPTOR_BLOCK: dump_descriptor_block(out_file, source, buf, jsb, &blocknr, blocksize, transaction); continue; case JFS_COMMIT_BLOCK: transaction++; blocknr++; WRAP(jsb, blocknr); continue; case JFS_REVOKE_BLOCK: dump_revoke_block(out_file, buf, jsb, blocknr, blocksize, transaction); blocknr++; WRAP(jsb, blocknr); continue; default: fprintf (out_file, "Unexpected block type %u at " "block %u.\n", blocktype, blocknr); return; } } }
static errcode_t e2fsck_get_journal(e2fsck_t ctx, journal_t **ret_journal) { struct process_block_struct pb; struct ext2_super_block *sb = ctx->fs->super; struct ext2_super_block jsuper; struct problem_context pctx; struct buffer_head *bh; struct inode *j_inode = NULL; struct kdev_s *dev_fs = NULL, *dev_journal; const char *journal_name = 0; journal_t *journal = NULL; errcode_t retval = 0; io_manager io_ptr = 0; unsigned long long start = 0; int ext_journal = 0; int tried_backup_jnl = 0; clear_problem_context(&pctx); journal = e2fsck_allocate_memory(ctx, sizeof(journal_t), "journal"); if (!journal) { return EXT2_ET_NO_MEMORY; } dev_fs = e2fsck_allocate_memory(ctx, 2*sizeof(struct kdev_s), "kdev"); if (!dev_fs) { retval = EXT2_ET_NO_MEMORY; goto errout; } dev_journal = dev_fs+1; dev_fs->k_ctx = dev_journal->k_ctx = ctx; dev_fs->k_dev = K_DEV_FS; dev_journal->k_dev = K_DEV_JOURNAL; journal->j_dev = dev_journal; journal->j_fs_dev = dev_fs; journal->j_inode = NULL; journal->j_blocksize = ctx->fs->blocksize; if (uuid_is_null(sb->s_journal_uuid)) { if (!sb->s_journal_inum) { retval = EXT2_ET_BAD_INODE_NUM; goto errout; } j_inode = e2fsck_allocate_memory(ctx, sizeof(*j_inode), "journal inode"); if (!j_inode) { retval = EXT2_ET_NO_MEMORY; goto errout; } j_inode->i_ctx = ctx; j_inode->i_ino = sb->s_journal_inum; if ((retval = ext2fs_read_inode(ctx->fs, sb->s_journal_inum, &j_inode->i_ext2))) { try_backup_journal: if (sb->s_jnl_backup_type != EXT3_JNL_BACKUP_BLOCKS || tried_backup_jnl) goto errout; memset(&j_inode->i_ext2, 0, sizeof(struct ext2_inode)); memcpy(&j_inode->i_ext2.i_block[0], sb->s_jnl_blocks, EXT2_N_BLOCKS*4); j_inode->i_ext2.i_size_high = sb->s_jnl_blocks[15]; j_inode->i_ext2.i_size = sb->s_jnl_blocks[16]; j_inode->i_ext2.i_links_count = 1; j_inode->i_ext2.i_mode = LINUX_S_IFREG | 0600; e2fsck_use_inode_shortcuts(ctx, 1); ctx->stashed_ino = j_inode->i_ino; ctx->stashed_inode = &j_inode->i_ext2; tried_backup_jnl++; } if (!j_inode->i_ext2.i_links_count || !LINUX_S_ISREG(j_inode->i_ext2.i_mode)) { retval = EXT2_ET_NO_JOURNAL; goto try_backup_journal; } if (EXT2_I_SIZE(&j_inode->i_ext2) / journal->j_blocksize < JFS_MIN_JOURNAL_BLOCKS) { retval = EXT2_ET_JOURNAL_TOO_SMALL; goto try_backup_journal; } pb.last_block = -1; retval = ext2fs_block_iterate3(ctx->fs, j_inode->i_ino, BLOCK_FLAG_HOLE, 0, process_journal_block, &pb); if ((pb.last_block + 1) * ctx->fs->blocksize < (int) EXT2_I_SIZE(&j_inode->i_ext2)) { retval = EXT2_ET_JOURNAL_TOO_SMALL; goto try_backup_journal; } if (tried_backup_jnl && !(ctx->options & E2F_OPT_READONLY)) { retval = ext2fs_write_inode(ctx->fs, sb->s_journal_inum, &j_inode->i_ext2); if (retval) goto errout; } journal->j_maxlen = EXT2_I_SIZE(&j_inode->i_ext2) / journal->j_blocksize; #ifdef USE_INODE_IO retval = ext2fs_inode_io_intern2(ctx->fs, sb->s_journal_inum, &j_inode->i_ext2, &journal_name); if (retval) goto errout; io_ptr = inode_io_manager; #else journal->j_inode = j_inode; ctx->journal_io = ctx->fs->io; if ((retval = (errcode_t) journal_bmap(journal, 0, &start)) != 0) goto errout; #endif } else { ext_journal = 1; if (!ctx->journal_name) { char uuid[37]; uuid_unparse(sb->s_journal_uuid, uuid); ctx->journal_name = blkid_get_devname(ctx->blkid, "UUID", uuid); if (!ctx->journal_name) ctx->journal_name = blkid_devno_to_devname(sb->s_journal_dev); } journal_name = ctx->journal_name; if (!journal_name) { fix_problem(ctx, PR_0_CANT_FIND_JOURNAL, &pctx); retval = EXT2_ET_LOAD_EXT_JOURNAL; goto errout; } jfs_debug(1, "Using journal file %s\n", journal_name); io_ptr = unix_io_manager; } #if 0 test_io_backing_manager = io_ptr; io_ptr = test_io_manager; #endif #ifndef USE_INODE_IO if (ext_journal) #endif { int flags = IO_FLAG_RW; if (!(ctx->mount_flags & EXT2_MF_ISROOT && ctx->mount_flags & EXT2_MF_READONLY)) flags |= IO_FLAG_EXCLUSIVE; if ((ctx->mount_flags & EXT2_MF_READONLY) && (ctx->options & E2F_OPT_FORCE)) flags &= ~IO_FLAG_EXCLUSIVE; retval = io_ptr->open(journal_name, flags, &ctx->journal_io); } if (retval) goto errout; io_channel_set_blksize(ctx->journal_io, ctx->fs->blocksize); if (ext_journal) { blk64_t maxlen; start = ext2fs_journal_sb_start(ctx->fs->blocksize) - 1; bh = getblk(dev_journal, start, ctx->fs->blocksize); if (!bh) { retval = EXT2_ET_NO_MEMORY; goto errout; } ll_rw_block(READ, 1, &bh); if ((retval = bh->b_err) != 0) { brelse(bh); goto errout; } memcpy(&jsuper, start ? bh->b_data : bh->b_data + SUPERBLOCK_OFFSET, sizeof(jsuper)); #ifdef WORDS_BIGENDIAN if (jsuper.s_magic == ext2fs_swab16(EXT2_SUPER_MAGIC)) ext2fs_swap_super(&jsuper); #endif if (jsuper.s_magic != EXT2_SUPER_MAGIC || !(jsuper.s_feature_incompat & EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) { fix_problem(ctx, PR_0_EXT_JOURNAL_BAD_SUPER, &pctx); retval = EXT2_ET_LOAD_EXT_JOURNAL; brelse(bh); goto errout; } /* Make sure the journal UUID is correct */ if (memcmp(jsuper.s_uuid, ctx->fs->super->s_journal_uuid, sizeof(jsuper.s_uuid))) { fix_problem(ctx, PR_0_JOURNAL_BAD_UUID, &pctx); retval = EXT2_ET_LOAD_EXT_JOURNAL; brelse(bh); goto errout; } /* Check the superblock checksum */ if (jsuper.s_feature_ro_compat & EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) { struct struct_ext2_filsys fsx; struct ext2_super_block superx; void *p; p = start ? bh->b_data : bh->b_data + SUPERBLOCK_OFFSET; memcpy(&fsx, ctx->fs, sizeof(fsx)); memcpy(&superx, ctx->fs->super, sizeof(superx)); fsx.super = &superx; fsx.super->s_feature_ro_compat |= EXT4_FEATURE_RO_COMPAT_METADATA_CSUM; if (!ext2fs_superblock_csum_verify(&fsx, p) && fix_problem(ctx, PR_0_EXT_JOURNAL_SUPER_CSUM_INVALID, &pctx)) { ext2fs_superblock_csum_set(&fsx, p); mark_buffer_dirty(bh); } } brelse(bh); maxlen = ext2fs_blocks_count(&jsuper); journal->j_maxlen = (maxlen < 1ULL << 32) ? maxlen : (1ULL << 32) - 1; start++; } if (!(bh = getblk(dev_journal, start, journal->j_blocksize))) { retval = EXT2_ET_NO_MEMORY; goto errout; } journal->j_sb_buffer = bh; journal->j_superblock = (journal_superblock_t *)bh->b_data; #ifdef USE_INODE_IO if (j_inode) ext2fs_free_mem(&j_inode); #endif *ret_journal = journal; e2fsck_use_inode_shortcuts(ctx, 0); return 0; errout: e2fsck_use_inode_shortcuts(ctx, 0); if (dev_fs) ext2fs_free_mem(&dev_fs); if (j_inode) ext2fs_free_mem(&j_inode); if (journal) ext2fs_free_mem(&journal); return retval; }
/* * Note: if superblock is non-zero, block-size must also be non-zero. * Superblock and block_size can be zero to use the default size. * * Valid flags for ext2fs_open() * * EXT2_FLAG_RW - Open the filesystem for read/write. * EXT2_FLAG_FORCE - Open the filesystem even if some of the * features aren't supported. * EXT2_FLAG_JOURNAL_DEV_OK - Open an ext3 journal device */ errcode_t ext2fs_open2(const char *name, const char *io_options, int flags, int superblock, unsigned int block_size, io_manager manager, ext2_filsys *ret_fs) { ext2_filsys fs; errcode_t retval; unsigned long i; int groups_per_block, blocks_per_group; blk_t group_block, blk; char *dest, *cp; #ifdef EXT2FS_ENABLE_SWAPFS int j; struct ext2_group_desc *gdp; #endif EXT2_CHECK_MAGIC(manager, EXT2_ET_MAGIC_IO_MANAGER); retval = ext2fs_get_mem(sizeof(struct struct_ext2_filsys), &fs); if (retval) return retval; memset(fs, 0, sizeof(struct struct_ext2_filsys)); fs->magic = EXT2_ET_MAGIC_EXT2FS_FILSYS; fs->flags = flags; fs->umask = 022; retval = ext2fs_get_mem(strlen(name)+1, &fs->device_name); if (retval) goto cleanup; strcpy(fs->device_name, name); cp = strchr(fs->device_name, '?'); if (!io_options && cp) { *cp++ = 0; io_options = cp; } retval = manager->open(fs->device_name, (flags & EXT2_FLAG_RW) ? IO_FLAG_RW : 0, &fs->io); if (retval) goto cleanup; if (io_options && (retval = io_channel_set_options(fs->io, io_options))) goto cleanup; fs->image_io = fs->io; fs->io->app_data = fs; retval = ext2fs_get_mem(SUPERBLOCK_SIZE, &fs->super); if (retval) goto cleanup; if (flags & EXT2_FLAG_IMAGE_FILE) { retval = ext2fs_get_mem(sizeof(struct ext2_image_hdr), &fs->image_header); if (retval) goto cleanup; retval = io_channel_read_blk(fs->io, 0, -(int)sizeof(struct ext2_image_hdr), fs->image_header); if (retval) goto cleanup; if (fs->image_header->magic_number != EXT2_ET_MAGIC_E2IMAGE) return EXT2_ET_MAGIC_E2IMAGE; superblock = 1; block_size = fs->image_header->fs_blocksize; } /* * If the user specifies a specific block # for the * superblock, then he/she must also specify the block size! * Otherwise, read the master superblock located at offset * SUPERBLOCK_OFFSET from the start of the partition. * * Note: we only save a backup copy of the superblock if we * are reading the superblock from the primary superblock location. */ if (superblock) { if (!block_size) { retval = EXT2_ET_INVALID_ARGUMENT; goto cleanup; } io_channel_set_blksize(fs->io, block_size); group_block = superblock; fs->orig_super = 0; } else { io_channel_set_blksize(fs->io, SUPERBLOCK_OFFSET); superblock = 1; group_block = 0; retval = ext2fs_get_mem(SUPERBLOCK_SIZE, &fs->orig_super); if (retval) goto cleanup; } retval = io_channel_read_blk(fs->io, superblock, -SUPERBLOCK_SIZE, fs->super); if (retval) goto cleanup; if (fs->orig_super) memcpy(fs->orig_super, fs->super, SUPERBLOCK_SIZE); #ifdef EXT2FS_ENABLE_SWAPFS if ((fs->super->s_magic == ext2fs_swab16(EXT2_SUPER_MAGIC)) || (fs->flags & EXT2_FLAG_SWAP_BYTES)) { fs->flags |= EXT2_FLAG_SWAP_BYTES; ext2fs_swap_super(fs->super); } #endif if (fs->super->s_magic != EXT2_SUPER_MAGIC) { retval = EXT2_ET_BAD_MAGIC; goto cleanup; } if (fs->super->s_rev_level > EXT2_LIB_CURRENT_REV) { retval = EXT2_ET_REV_TOO_HIGH; goto cleanup; } /* * Check for feature set incompatibility */ if (!(flags & EXT2_FLAG_FORCE)) { if (fs->super->s_feature_incompat & ~EXT2_LIB_FEATURE_INCOMPAT_SUPP) { retval = EXT2_ET_UNSUPP_FEATURE; goto cleanup; } if ((flags & EXT2_FLAG_RW) && (fs->super->s_feature_ro_compat & ~EXT2_LIB_FEATURE_RO_COMPAT_SUPP)) { retval = EXT2_ET_RO_UNSUPP_FEATURE; goto cleanup; } if (!(flags & EXT2_FLAG_JOURNAL_DEV_OK) && (fs->super->s_feature_incompat & EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) { retval = EXT2_ET_UNSUPP_FEATURE; goto cleanup; } } fs->blocksize = EXT2_BLOCK_SIZE(fs->super); if (fs->blocksize == 0) { retval = EXT2_ET_CORRUPT_SUPERBLOCK; goto cleanup; } fs->fragsize = EXT2_FRAG_SIZE(fs->super); fs->inode_blocks_per_group = ((fs->super->s_inodes_per_group * EXT2_INODE_SIZE(fs->super) + EXT2_BLOCK_SIZE(fs->super) - 1) / EXT2_BLOCK_SIZE(fs->super)); if (block_size) { if (block_size != fs->blocksize) { retval = EXT2_ET_UNEXPECTED_BLOCK_SIZE; goto cleanup; } } /* * Set the blocksize to the filesystem's blocksize. */ io_channel_set_blksize(fs->io, fs->blocksize); /* * If this is an external journal device, don't try to read * the group descriptors, because they're not there. */ if (fs->super->s_feature_incompat & EXT3_FEATURE_INCOMPAT_JOURNAL_DEV) { fs->group_desc_count = 0; *ret_fs = fs; return 0; } /* * Read group descriptors */ blocks_per_group = EXT2_BLOCKS_PER_GROUP(fs->super); if (blocks_per_group == 0 || blocks_per_group > EXT2_MAX_BLOCKS_PER_GROUP(fs->super) || fs->inode_blocks_per_group > EXT2_MAX_INODES_PER_GROUP(fs->super)) { retval = EXT2_ET_CORRUPT_SUPERBLOCK; goto cleanup; } fs->group_desc_count = (fs->super->s_blocks_count - fs->super->s_first_data_block + blocks_per_group - 1) / blocks_per_group; fs->desc_blocks = (fs->group_desc_count + EXT2_DESC_PER_BLOCK(fs->super) - 1) / EXT2_DESC_PER_BLOCK(fs->super); retval = ext2fs_get_mem(fs->desc_blocks * fs->blocksize, &fs->group_desc); if (retval) goto cleanup; if (!group_block) group_block = fs->super->s_first_data_block; dest = (char *) fs->group_desc; groups_per_block = fs->blocksize / sizeof(struct ext2_group_desc); for (i=0 ; i < fs->desc_blocks; i++) { blk = ext2fs_descriptor_block_loc(fs, group_block, i); retval = io_channel_read_blk(fs->io, blk, 1, dest); if (retval) goto cleanup; #ifdef EXT2FS_ENABLE_SWAPFS if (fs->flags & EXT2_FLAG_SWAP_BYTES) { gdp = (struct ext2_group_desc *) dest; for (j=0; j < groups_per_block; j++) ext2fs_swap_group_desc(gdp++); } #endif dest += fs->blocksize; } *ret_fs = fs; return 0; cleanup: ext2fs_free(fs); return retval; }
void ext2fs_swap_super(struct ext2_super_block * sb) { int i; sb->s_inodes_count = ext2fs_swab32(sb->s_inodes_count); sb->s_blocks_count = ext2fs_swab32(sb->s_blocks_count); sb->s_r_blocks_count = ext2fs_swab32(sb->s_r_blocks_count); sb->s_free_blocks_count = ext2fs_swab32(sb->s_free_blocks_count); sb->s_free_inodes_count = ext2fs_swab32(sb->s_free_inodes_count); sb->s_first_data_block = ext2fs_swab32(sb->s_first_data_block); sb->s_log_block_size = ext2fs_swab32(sb->s_log_block_size); sb->s_log_frag_size = ext2fs_swab32(sb->s_log_frag_size); sb->s_blocks_per_group = ext2fs_swab32(sb->s_blocks_per_group); sb->s_frags_per_group = ext2fs_swab32(sb->s_frags_per_group); sb->s_inodes_per_group = ext2fs_swab32(sb->s_inodes_per_group); sb->s_mtime = ext2fs_swab32(sb->s_mtime); sb->s_wtime = ext2fs_swab32(sb->s_wtime); sb->s_mnt_count = ext2fs_swab16(sb->s_mnt_count); sb->s_max_mnt_count = ext2fs_swab16(sb->s_max_mnt_count); sb->s_magic = ext2fs_swab16(sb->s_magic); sb->s_state = ext2fs_swab16(sb->s_state); sb->s_errors = ext2fs_swab16(sb->s_errors); sb->s_minor_rev_level = ext2fs_swab16(sb->s_minor_rev_level); sb->s_lastcheck = ext2fs_swab32(sb->s_lastcheck); sb->s_checkinterval = ext2fs_swab32(sb->s_checkinterval); sb->s_creator_os = ext2fs_swab32(sb->s_creator_os); sb->s_rev_level = ext2fs_swab32(sb->s_rev_level); sb->s_def_resuid = ext2fs_swab16(sb->s_def_resuid); sb->s_def_resgid = ext2fs_swab16(sb->s_def_resgid); sb->s_first_ino = ext2fs_swab32(sb->s_first_ino); sb->s_inode_size = ext2fs_swab16(sb->s_inode_size); sb->s_block_group_nr = ext2fs_swab16(sb->s_block_group_nr); sb->s_feature_compat = ext2fs_swab32(sb->s_feature_compat); sb->s_feature_incompat = ext2fs_swab32(sb->s_feature_incompat); sb->s_feature_ro_compat = ext2fs_swab32(sb->s_feature_ro_compat); sb->s_algorithm_usage_bitmap = ext2fs_swab32(sb->s_algorithm_usage_bitmap); sb->s_reserved_gdt_blocks = ext2fs_swab16(sb->s_reserved_gdt_blocks); sb->s_journal_inum = ext2fs_swab32(sb->s_journal_inum); sb->s_journal_dev = ext2fs_swab32(sb->s_journal_dev); sb->s_last_orphan = ext2fs_swab32(sb->s_last_orphan); sb->s_desc_size = ext2fs_swab16(sb->s_desc_size); sb->s_default_mount_opts = ext2fs_swab32(sb->s_default_mount_opts); sb->s_first_meta_bg = ext2fs_swab32(sb->s_first_meta_bg); sb->s_mkfs_time = ext2fs_swab32(sb->s_mkfs_time); sb->s_blocks_count_hi = ext2fs_swab32(sb->s_blocks_count_hi); sb->s_r_blocks_count_hi = ext2fs_swab32(sb->s_r_blocks_count_hi); sb->s_free_blocks_hi = ext2fs_swab32(sb->s_free_blocks_hi); sb->s_min_extra_isize = ext2fs_swab16(sb->s_min_extra_isize); sb->s_want_extra_isize = ext2fs_swab16(sb->s_want_extra_isize); sb->s_flags = ext2fs_swab32(sb->s_flags); sb->s_kbytes_written = ext2fs_swab64(sb->s_kbytes_written); for (i=0; i < 4; i++) sb->s_hash_seed[i] = ext2fs_swab32(sb->s_hash_seed[i]); /* if journal backup is for a valid extent-based journal... */ if (!ext2fs_extent_header_verify(sb->s_jnl_blocks, sizeof(sb->s_jnl_blocks))) { /* ... swap only the journal i_size */ sb->s_jnl_blocks[16] = ext2fs_swab32(sb->s_jnl_blocks[16]); /* and the extent data is not swapped on read */ return; } /* direct/indirect journal: swap it all */ for (i=0; i < 17; i++) sb->s_jnl_blocks[i] = ext2fs_swab32(sb->s_jnl_blocks[i]); }
void ext2fs_swap_inode_full(ext2_filsys fs, struct ext2_inode_large *t, struct ext2_inode_large *f, int hostorder, int bufsize) { unsigned i; int islnk = 0; __u32 *eaf, *eat; if (hostorder && LINUX_S_ISLNK(f->i_mode)) islnk = 1; t->i_mode = ext2fs_swab16(f->i_mode); if (!hostorder && LINUX_S_ISLNK(t->i_mode)) islnk = 1; t->i_uid = ext2fs_swab16(f->i_uid); t->i_size = ext2fs_swab32(f->i_size); t->i_atime = ext2fs_swab32(f->i_atime); t->i_ctime = ext2fs_swab32(f->i_ctime); t->i_mtime = ext2fs_swab32(f->i_mtime); t->i_dtime = ext2fs_swab32(f->i_dtime); t->i_gid = ext2fs_swab16(f->i_gid); t->i_links_count = ext2fs_swab16(f->i_links_count); t->i_blocks = ext2fs_swab32(f->i_blocks); t->i_flags = ext2fs_swab32(f->i_flags); t->i_file_acl = ext2fs_swab32(f->i_file_acl); t->i_dir_acl = ext2fs_swab32(f->i_dir_acl); if (!islnk || ext2fs_inode_data_blocks(fs, (struct ext2_inode *)t)) { for (i = 0; i < EXT2_N_BLOCKS; i++) t->i_block[i] = ext2fs_swab32(f->i_block[i]); } else if (t != f) { for (i = 0; i < EXT2_N_BLOCKS; i++) t->i_block[i] = f->i_block[i]; } t->i_generation = ext2fs_swab32(f->i_generation); t->i_faddr = ext2fs_swab32(f->i_faddr); switch (fs->super->s_creator_os) { case EXT2_OS_LINUX: t->osd1.linux1.l_i_reserved1 = ext2fs_swab32(f->osd1.linux1.l_i_reserved1); t->osd2.linux2.l_i_frag = f->osd2.linux2.l_i_frag; t->osd2.linux2.l_i_fsize = f->osd2.linux2.l_i_fsize; t->osd2.linux2.i_pad1 = ext2fs_swab16(f->osd2.linux2.i_pad1); t->osd2.linux2.l_i_uid_high = ext2fs_swab16 (f->osd2.linux2.l_i_uid_high); t->osd2.linux2.l_i_gid_high = ext2fs_swab16 (f->osd2.linux2.l_i_gid_high); t->osd2.linux2.l_i_reserved2 = ext2fs_swab32(f->osd2.linux2.l_i_reserved2); break; case EXT2_OS_HURD: t->osd1.hurd1.h_i_translator = ext2fs_swab32 (f->osd1.hurd1.h_i_translator); t->osd2.hurd2.h_i_frag = f->osd2.hurd2.h_i_frag; t->osd2.hurd2.h_i_fsize = f->osd2.hurd2.h_i_fsize; t->osd2.hurd2.h_i_mode_high = ext2fs_swab16 (f->osd2.hurd2.h_i_mode_high); t->osd2.hurd2.h_i_uid_high = ext2fs_swab16 (f->osd2.hurd2.h_i_uid_high); t->osd2.hurd2.h_i_gid_high = ext2fs_swab16 (f->osd2.hurd2.h_i_gid_high); t->osd2.hurd2.h_i_author = ext2fs_swab32 (f->osd2.hurd2.h_i_author); break; case EXT2_OS_MASIX: t->osd1.masix1.m_i_reserved1 = ext2fs_swab32(f->osd1.masix1.m_i_reserved1); t->osd2.masix2.m_i_frag = f->osd2.masix2.m_i_frag; t->osd2.masix2.m_i_fsize = f->osd2.masix2.m_i_fsize; t->osd2.masix2.m_pad1 = ext2fs_swab16(f->osd2.masix2.m_pad1); t->osd2.masix2.m_i_reserved2[0] = ext2fs_swab32(f->osd2.masix2.m_i_reserved2[0]); t->osd2.masix2.m_i_reserved2[1] = ext2fs_swab32(f->osd2.masix2.m_i_reserved2[1]); break; } if (bufsize < (int) (sizeof(struct ext2_inode) + sizeof(__u16))) return; /* no i_extra_isize field */ t->i_extra_isize = ext2fs_swab16(f->i_extra_isize); if (t->i_extra_isize > EXT2_INODE_SIZE(fs->super) - sizeof(struct ext2_inode)) { /* this is error case: i_extra_size is too large */ return; } i = sizeof(struct ext2_inode) + t->i_extra_isize + sizeof(__u32); if (bufsize < (int) i) return; /* no space for EA magic */ eaf = (__u32 *) (((char *) f) + sizeof(struct ext2_inode) + f->i_extra_isize); if (ext2fs_swab32(*eaf) != EXT2_EXT_ATTR_MAGIC) return; /* it seems no magic here */ eat = (__u32 *) (((char *) t) + sizeof(struct ext2_inode) + f->i_extra_isize); *eat = ext2fs_swab32(*eaf); /* convert EA(s) */ ext2fs_swap_ext_attr((char *) (eat + 1), (char *) (eaf + 1), bufsize - sizeof(struct ext2_inode) - t->i_extra_isize - sizeof(__u32), 0); }
void ext2fs_swap_inode_full(ext2_filsys fs, struct ext2_inode_large *t, struct ext2_inode_large *f, int hostorder, int bufsize) { unsigned i, has_data_blocks, extra_isize, attr_magic; int has_extents = 0; int islnk = 0; __u32 *eaf, *eat; if (hostorder && LINUX_S_ISLNK(f->i_mode)) islnk = 1; t->i_mode = ext2fs_swab16(f->i_mode); if (!hostorder && LINUX_S_ISLNK(t->i_mode)) islnk = 1; t->i_uid = ext2fs_swab16(f->i_uid); t->i_size = ext2fs_swab32(f->i_size); t->i_atime = ext2fs_swab32(f->i_atime); t->i_ctime = ext2fs_swab32(f->i_ctime); t->i_mtime = ext2fs_swab32(f->i_mtime); t->i_dtime = ext2fs_swab32(f->i_dtime); t->i_gid = ext2fs_swab16(f->i_gid); t->i_links_count = ext2fs_swab16(f->i_links_count); t->i_file_acl = ext2fs_swab32(f->i_file_acl); if (hostorder) has_data_blocks = ext2fs_inode_data_blocks(fs, (struct ext2_inode *) f); t->i_blocks = ext2fs_swab32(f->i_blocks); if (!hostorder) has_data_blocks = ext2fs_inode_data_blocks(fs, (struct ext2_inode *) t); if (hostorder && (f->i_flags & EXT4_EXTENTS_FL)) has_extents = 1; t->i_flags = ext2fs_swab32(f->i_flags); if (!hostorder && (t->i_flags & EXT4_EXTENTS_FL)) has_extents = 1; t->i_dir_acl = ext2fs_swab32(f->i_dir_acl); if (!has_extents && (!islnk || has_data_blocks)) { for (i = 0; i < EXT2_N_BLOCKS; i++) t->i_block[i] = ext2fs_swab32(f->i_block[i]); } else if (t != f) { for (i = 0; i < EXT2_N_BLOCKS; i++) t->i_block[i] = f->i_block[i]; } t->i_generation = ext2fs_swab32(f->i_generation); t->i_faddr = ext2fs_swab32(f->i_faddr); switch (fs->super->s_creator_os) { case EXT2_OS_LINUX: t->osd1.linux1.l_i_version = ext2fs_swab32(f->osd1.linux1.l_i_version); t->osd2.linux2.l_i_blocks_hi = ext2fs_swab16(f->osd2.linux2.l_i_blocks_hi); t->osd2.linux2.l_i_file_acl_high = ext2fs_swab16(f->osd2.linux2.l_i_file_acl_high); t->osd2.linux2.l_i_uid_high = ext2fs_swab16 (f->osd2.linux2.l_i_uid_high); t->osd2.linux2.l_i_gid_high = ext2fs_swab16 (f->osd2.linux2.l_i_gid_high); t->osd2.linux2.l_i_reserved2 = ext2fs_swab32(f->osd2.linux2.l_i_reserved2); break; case EXT2_OS_HURD: t->osd1.hurd1.h_i_translator = ext2fs_swab32 (f->osd1.hurd1.h_i_translator); t->osd2.hurd2.h_i_frag = f->osd2.hurd2.h_i_frag; t->osd2.hurd2.h_i_fsize = f->osd2.hurd2.h_i_fsize; t->osd2.hurd2.h_i_mode_high = ext2fs_swab16 (f->osd2.hurd2.h_i_mode_high); t->osd2.hurd2.h_i_uid_high = ext2fs_swab16 (f->osd2.hurd2.h_i_uid_high); t->osd2.hurd2.h_i_gid_high = ext2fs_swab16 (f->osd2.hurd2.h_i_gid_high); t->osd2.hurd2.h_i_author = ext2fs_swab32 (f->osd2.hurd2.h_i_author); break; default: break; } if (bufsize < (int) (sizeof(struct ext2_inode) + sizeof(__u16))) return; if (hostorder) extra_isize = f->i_extra_isize; t->i_extra_isize = ext2fs_swab16(f->i_extra_isize); if (!hostorder) extra_isize = t->i_extra_isize; if (extra_isize > EXT2_INODE_SIZE(fs->super) - sizeof(struct ext2_inode)) { return; } i = sizeof(struct ext2_inode) + extra_isize + sizeof(__u32); if (bufsize < (int) i) return; eaf = (__u32 *) (((char *) f) + sizeof(struct ext2_inode) + extra_isize); attr_magic = *eaf; if (!hostorder) attr_magic = ext2fs_swab32(attr_magic); if (attr_magic != EXT2_EXT_ATTR_MAGIC) return; eat = (__u32 *) (((char *) t) + sizeof(struct ext2_inode) + extra_isize); *eat = ext2fs_swab32(*eaf); ext2fs_swap_ext_attr((char *) (eat + 1), (char *) (eaf + 1), bufsize - sizeof(struct ext2_inode) - extra_isize - sizeof(__u32), 0); }
blk64_t get_backup_sb(e2fsck_t ctx, ext2_filsys fs, const char *name, io_manager manager) { struct ext2_super_block *sb; io_channel io = NULL; void *buf = NULL; int blocksize; blk64_t superblock, ret_sb = 8193; if (fs && fs->super) { ret_sb = (fs->super->s_blocks_per_group + fs->super->s_first_data_block); if (ctx) { ctx->superblock = ret_sb; ctx->blocksize = fs->blocksize; } return ret_sb; } if (ctx) { if (ctx->blocksize) { ret_sb = ctx->blocksize * 8; if (ctx->blocksize == 1024) ret_sb++; ctx->superblock = ret_sb; return ret_sb; } ctx->superblock = ret_sb; ctx->blocksize = 1024; } if (!name || !manager) goto cleanup; if (manager->open(name, 0, &io) != 0) goto cleanup; if (ext2fs_get_mem(SUPERBLOCK_SIZE, &buf)) goto cleanup; sb = (struct ext2_super_block *) buf; for (blocksize = EXT2_MIN_BLOCK_SIZE; blocksize <= EXT2_MAX_BLOCK_SIZE ; blocksize *= 2) { superblock = blocksize*8; if (blocksize == 1024) superblock++; io_channel_set_blksize(io, blocksize); if (io_channel_read_blk64(io, superblock, -SUPERBLOCK_SIZE, buf)) continue; #ifdef WORDS_BIGENDIAN if (sb->s_magic == ext2fs_swab16(EXT2_SUPER_MAGIC)) ext2fs_swap_super(sb); #endif if ((sb->s_magic == EXT2_SUPER_MAGIC) && (EXT2_BLOCK_SIZE(sb) == blocksize)) { ret_sb = superblock; if (ctx) { ctx->superblock = superblock; ctx->blocksize = blocksize; } break; } } cleanup: if (io) io_channel_close(io); if (buf) ext2fs_free_mem(&buf); return (ret_sb); }
void ext2fs_swap_super(struct ext2_super_block * sb) { int i; sb->s_inodes_count = ext2fs_swab32(sb->s_inodes_count); sb->s_blocks_count = ext2fs_swab32(sb->s_blocks_count); sb->s_r_blocks_count = ext2fs_swab32(sb->s_r_blocks_count); sb->s_free_blocks_count = ext2fs_swab32(sb->s_free_blocks_count); sb->s_free_inodes_count = ext2fs_swab32(sb->s_free_inodes_count); sb->s_first_data_block = ext2fs_swab32(sb->s_first_data_block); sb->s_log_block_size = ext2fs_swab32(sb->s_log_block_size); sb->s_log_frag_size = ext2fs_swab32(sb->s_log_frag_size); sb->s_blocks_per_group = ext2fs_swab32(sb->s_blocks_per_group); sb->s_frags_per_group = ext2fs_swab32(sb->s_frags_per_group); sb->s_inodes_per_group = ext2fs_swab32(sb->s_inodes_per_group); sb->s_mtime = ext2fs_swab32(sb->s_mtime); sb->s_wtime = ext2fs_swab32(sb->s_wtime); sb->s_mnt_count = ext2fs_swab16(sb->s_mnt_count); sb->s_max_mnt_count = ext2fs_swab16(sb->s_max_mnt_count); sb->s_magic = ext2fs_swab16(sb->s_magic); sb->s_state = ext2fs_swab16(sb->s_state); sb->s_errors = ext2fs_swab16(sb->s_errors); sb->s_minor_rev_level = ext2fs_swab16(sb->s_minor_rev_level); sb->s_lastcheck = ext2fs_swab32(sb->s_lastcheck); sb->s_checkinterval = ext2fs_swab32(sb->s_checkinterval); sb->s_creator_os = ext2fs_swab32(sb->s_creator_os); sb->s_rev_level = ext2fs_swab32(sb->s_rev_level); sb->s_def_resuid = ext2fs_swab16(sb->s_def_resuid); sb->s_def_resgid = ext2fs_swab16(sb->s_def_resgid); sb->s_first_ino = ext2fs_swab32(sb->s_first_ino); sb->s_inode_size = ext2fs_swab16(sb->s_inode_size); sb->s_block_group_nr = ext2fs_swab16(sb->s_block_group_nr); sb->s_feature_compat = ext2fs_swab32(sb->s_feature_compat); sb->s_feature_incompat = ext2fs_swab32(sb->s_feature_incompat); sb->s_feature_ro_compat = ext2fs_swab32(sb->s_feature_ro_compat); sb->s_algorithm_usage_bitmap = ext2fs_swab32(sb->s_algorithm_usage_bitmap); sb->s_reserved_gdt_blocks = ext2fs_swab16(sb->s_reserved_gdt_blocks); sb->s_journal_inum = ext2fs_swab32(sb->s_journal_inum); sb->s_journal_dev = ext2fs_swab32(sb->s_journal_dev); sb->s_last_orphan = ext2fs_swab32(sb->s_last_orphan); sb->s_desc_size = ext2fs_swab16(sb->s_desc_size); sb->s_default_mount_opts = ext2fs_swab32(sb->s_default_mount_opts); sb->s_first_meta_bg = ext2fs_swab32(sb->s_first_meta_bg); sb->s_mkfs_time = ext2fs_swab32(sb->s_mkfs_time); sb->s_blocks_count_hi = ext2fs_swab32(sb->s_blocks_count_hi); sb->s_r_blocks_count_hi = ext2fs_swab32(sb->s_r_blocks_count_hi); sb->s_free_blocks_hi = ext2fs_swab32(sb->s_free_blocks_hi); sb->s_min_extra_isize = ext2fs_swab16(sb->s_min_extra_isize); sb->s_want_extra_isize = ext2fs_swab16(sb->s_want_extra_isize); sb->s_flags = ext2fs_swab32(sb->s_flags); sb->s_kbytes_written = ext2fs_swab64(sb->s_kbytes_written); sb->s_snapshot_inum = ext2fs_swab32(sb->s_snapshot_inum); sb->s_snapshot_id = ext2fs_swab32(sb->s_snapshot_id); sb->s_snapshot_r_blocks_count = ext2fs_swab64(sb->s_snapshot_r_blocks_count); sb->s_snapshot_list = ext2fs_swab32(sb->s_snapshot_list); for (i=0; i < 4; i++) sb->s_hash_seed[i] = ext2fs_swab32(sb->s_hash_seed[i]); if (!ext2fs_extent_header_verify(sb->s_jnl_blocks, sizeof(sb->s_jnl_blocks))) { sb->s_jnl_blocks[16] = ext2fs_swab32(sb->s_jnl_blocks[16]); return; } for (i=0; i < 17; i++) sb->s_jnl_blocks[i] = ext2fs_swab32(sb->s_jnl_blocks[i]); }
static errcode_t e2fsck_get_journal(e2fsck_t ctx, journal_t **ret_journal) { struct ext2_super_block *sb = ctx->fs->super; struct ext2_super_block jsuper; struct problem_context pctx; struct buffer_head *bh; struct inode *j_inode = NULL; struct kdev_s *dev_fs = NULL, *dev_journal; const char *journal_name = 0; journal_t *journal = NULL; errcode_t retval = 0; io_manager io_ptr = 0; unsigned long start = 0; blk_t blk; int ext_journal = 0; int tried_backup_jnl = 0; int i; clear_problem_context(&pctx); journal = e2fsck_allocate_memory(ctx, sizeof(journal_t), "journal"); if (!journal) { return EXT2_ET_NO_MEMORY; } dev_fs = e2fsck_allocate_memory(ctx, 2*sizeof(struct kdev_s), "kdev"); if (!dev_fs) { retval = EXT2_ET_NO_MEMORY; goto errout; } dev_journal = dev_fs+1; dev_fs->k_ctx = dev_journal->k_ctx = ctx; dev_fs->k_dev = K_DEV_FS; dev_journal->k_dev = K_DEV_JOURNAL; journal->j_dev = dev_journal; journal->j_fs_dev = dev_fs; journal->j_inode = NULL; journal->j_blocksize = ctx->fs->blocksize; if (uuid_is_null(sb->s_journal_uuid)) { if (!sb->s_journal_inum) return EXT2_ET_BAD_INODE_NUM; j_inode = e2fsck_allocate_memory(ctx, sizeof(*j_inode), "journal inode"); if (!j_inode) { retval = EXT2_ET_NO_MEMORY; goto errout; } j_inode->i_ctx = ctx; j_inode->i_ino = sb->s_journal_inum; if ((retval = ext2fs_read_inode(ctx->fs, sb->s_journal_inum, &j_inode->i_ext2))) { try_backup_journal: if (sb->s_jnl_backup_type != EXT3_JNL_BACKUP_BLOCKS || tried_backup_jnl) goto errout; memset(&j_inode->i_ext2, 0, sizeof(struct ext2_inode)); memcpy(&j_inode->i_ext2.i_block[0], sb->s_jnl_blocks, EXT2_N_BLOCKS*4); j_inode->i_ext2.i_size = sb->s_jnl_blocks[16]; j_inode->i_ext2.i_links_count = 1; j_inode->i_ext2.i_mode = LINUX_S_IFREG | 0600; tried_backup_jnl++; } if (!j_inode->i_ext2.i_links_count || !LINUX_S_ISREG(j_inode->i_ext2.i_mode)) { retval = EXT2_ET_NO_JOURNAL; goto try_backup_journal; } if (j_inode->i_ext2.i_size / journal->j_blocksize < JFS_MIN_JOURNAL_BLOCKS) { retval = EXT2_ET_JOURNAL_TOO_SMALL; goto try_backup_journal; } for (i=0; i < EXT2_N_BLOCKS; i++) { blk = j_inode->i_ext2.i_block[i]; if (!blk) { if (i < EXT2_NDIR_BLOCKS) { retval = EXT2_ET_JOURNAL_TOO_SMALL; goto try_backup_journal; } continue; } if (blk < sb->s_first_data_block || blk >= sb->s_blocks_count) { retval = EXT2_ET_BAD_BLOCK_NUM; goto try_backup_journal; } } journal->j_maxlen = j_inode->i_ext2.i_size / journal->j_blocksize; #ifdef USE_INODE_IO retval = ext2fs_inode_io_intern2(ctx->fs, sb->s_journal_inum, &j_inode->i_ext2, &journal_name); if (retval) goto errout; io_ptr = inode_io_manager; #else journal->j_inode = j_inode; ctx->journal_io = ctx->fs->io; if ((retval = journal_bmap(journal, 0, &start)) != 0) goto errout; #endif } else { ext_journal = 1; if (!ctx->journal_name) { char uuid[37]; uuid_unparse(sb->s_journal_uuid, uuid); ctx->journal_name = blkid_get_devname(ctx->blkid, "UUID", uuid); if (!ctx->journal_name) ctx->journal_name = blkid_devno_to_devname(sb->s_journal_dev); } journal_name = ctx->journal_name; if (!journal_name) { fix_problem(ctx, PR_0_CANT_FIND_JOURNAL, &pctx); return EXT2_ET_LOAD_EXT_JOURNAL; } jfs_debug(1, "Using journal file %s\n", journal_name); io_ptr = unix_io_manager; } #if 0 test_io_backing_manager = io_ptr; io_ptr = test_io_manager; #endif #ifndef USE_INODE_IO if (ext_journal) #endif retval = io_ptr->open(journal_name, IO_FLAG_RW, &ctx->journal_io); if (retval) goto errout; io_channel_set_blksize(ctx->journal_io, ctx->fs->blocksize); if (ext_journal) { if (ctx->fs->blocksize == 1024) start = 1; bh = getblk(dev_journal, start, ctx->fs->blocksize); if (!bh) { retval = EXT2_ET_NO_MEMORY; goto errout; } ll_rw_block(READ, 1, &bh); if ((retval = bh->b_err) != 0) { brelse(bh); goto errout; } memcpy(&jsuper, start ? bh->b_data : bh->b_data + 1024, sizeof(jsuper)); brelse(bh); #ifdef EXT2FS_ENABLE_SWAPFS if (jsuper.s_magic == ext2fs_swab16(EXT2_SUPER_MAGIC)) ext2fs_swap_super(&jsuper); #endif if (jsuper.s_magic != EXT2_SUPER_MAGIC || !(jsuper.s_feature_incompat & EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) { fix_problem(ctx, PR_0_EXT_JOURNAL_BAD_SUPER, &pctx); retval = EXT2_ET_LOAD_EXT_JOURNAL; goto errout; } /* Make sure the journal UUID is correct */ if (memcmp(jsuper.s_uuid, ctx->fs->super->s_journal_uuid, sizeof(jsuper.s_uuid))) { fix_problem(ctx, PR_0_JOURNAL_BAD_UUID, &pctx); retval = EXT2_ET_LOAD_EXT_JOURNAL; goto errout; } journal->j_maxlen = jsuper.s_blocks_count; start++; } if (!(bh = getblk(dev_journal, start, journal->j_blocksize))) { retval = EXT2_ET_NO_MEMORY; goto errout; } journal->j_sb_buffer = bh; journal->j_superblock = (journal_superblock_t *)bh->b_data; #ifdef USE_INODE_IO if (j_inode) ext2fs_free_mem(&j_inode); #endif *ret_journal = journal; return 0; errout: if (dev_fs) ext2fs_free_mem(&dev_fs); if (j_inode) ext2fs_free_mem(&j_inode); if (journal) ext2fs_free_mem(&journal); return retval; }
static errcode_t ext2fs_get_journal(ext2_filsys fs, journal_t **ret_journal) { struct process_block_struct pb; struct ext2_super_block *sb = fs->super; struct ext2_super_block jsuper; struct buffer_head *bh; struct inode *j_inode = NULL; struct kdev_s *dev_fs = NULL, *dev_journal; const char *journal_name = 0; journal_t *journal = NULL; errcode_t retval = 0; io_manager io_ptr = 0; unsigned long long start = 0; int ext_journal = 0; int tried_backup_jnl = 0; retval = ext2fs_get_memzero(sizeof(journal_t), &journal); if (retval) return retval; retval = ext2fs_get_memzero(2 * sizeof(struct kdev_s), &dev_fs); if (retval) goto errout; dev_journal = dev_fs+1; dev_fs->k_fs = dev_journal->k_fs = fs; dev_fs->k_dev = K_DEV_FS; dev_journal->k_dev = K_DEV_JOURNAL; journal->j_dev = dev_journal; journal->j_fs_dev = dev_fs; journal->j_inode = NULL; journal->j_blocksize = fs->blocksize; if (uuid_is_null(sb->s_journal_uuid)) { if (!sb->s_journal_inum) { retval = EXT2_ET_BAD_INODE_NUM; goto errout; } retval = ext2fs_get_memzero(sizeof(*j_inode), &j_inode); if (retval) goto errout; j_inode->i_fs = fs; j_inode->i_ino = sb->s_journal_inum; retval = ext2fs_read_inode(fs, sb->s_journal_inum, &j_inode->i_ext2); if (retval) { try_backup_journal: if (sb->s_jnl_backup_type != EXT3_JNL_BACKUP_BLOCKS || tried_backup_jnl) goto errout; memset(&j_inode->i_ext2, 0, sizeof(struct ext2_inode)); memcpy(&j_inode->i_ext2.i_block[0], sb->s_jnl_blocks, EXT2_N_BLOCKS*4); j_inode->i_ext2.i_size_high = sb->s_jnl_blocks[15]; j_inode->i_ext2.i_size = sb->s_jnl_blocks[16]; j_inode->i_ext2.i_links_count = 1; j_inode->i_ext2.i_mode = LINUX_S_IFREG | 0600; tried_backup_jnl++; } if (!j_inode->i_ext2.i_links_count || !LINUX_S_ISREG(j_inode->i_ext2.i_mode)) { retval = EXT2_ET_NO_JOURNAL; goto try_backup_journal; } if (EXT2_I_SIZE(&j_inode->i_ext2) / journal->j_blocksize < JFS_MIN_JOURNAL_BLOCKS) { retval = EXT2_ET_JOURNAL_TOO_SMALL; goto try_backup_journal; } pb.last_block = -1; retval = ext2fs_block_iterate3(fs, j_inode->i_ino, BLOCK_FLAG_HOLE, 0, process_journal_block, &pb); if ((pb.last_block + 1) * fs->blocksize < (int) EXT2_I_SIZE(&j_inode->i_ext2)) { retval = EXT2_ET_JOURNAL_TOO_SMALL; goto try_backup_journal; } if (tried_backup_jnl && (fs->flags & EXT2_FLAG_RW)) { retval = ext2fs_write_inode(fs, sb->s_journal_inum, &j_inode->i_ext2); if (retval) goto errout; } journal->j_maxlen = EXT2_I_SIZE(&j_inode->i_ext2) / journal->j_blocksize; #ifdef USE_INODE_IO retval = ext2fs_inode_io_intern2(fs, sb->s_journal_inum, &j_inode->i_ext2, &journal_name); if (retval) goto errout; io_ptr = inode_io_manager; #else journal->j_inode = j_inode; fs->journal_io = fs->io; retval = (errcode_t)journal_bmap(journal, 0, &start); if (retval) goto errout; #endif } else { ext_journal = 1; if (!fs->journal_name) { char uuid[37]; blkid_cache blkid; blkid_get_cache(&blkid, NULL); uuid_unparse(sb->s_journal_uuid, uuid); fs->journal_name = blkid_get_devname(blkid, "UUID", uuid); if (!fs->journal_name) fs->journal_name = blkid_devno_to_devname(sb->s_journal_dev); blkid_put_cache(blkid); } journal_name = fs->journal_name; if (!journal_name) { retval = EXT2_ET_LOAD_EXT_JOURNAL; goto errout; } jfs_debug(1, "Using journal file %s\n", journal_name); io_ptr = unix_io_manager; } #if 0 test_io_backing_manager = io_ptr; io_ptr = test_io_manager; #endif #ifndef USE_INODE_IO if (ext_journal) #endif { retval = io_ptr->open(journal_name, fs->flags & EXT2_FLAG_RW, &fs->journal_io); } if (retval) goto errout; io_channel_set_blksize(fs->journal_io, fs->blocksize); if (ext_journal) { blk64_t maxlen; start = ext2fs_journal_sb_start(fs->blocksize) - 1; bh = getblk(dev_journal, start, fs->blocksize); if (!bh) { retval = EXT2_ET_NO_MEMORY; goto errout; } ll_rw_block(READ, 1, &bh); retval = bh->b_err; if (retval) { brelse(bh); goto errout; } memcpy(&jsuper, start ? bh->b_data : bh->b_data + SUPERBLOCK_OFFSET, sizeof(jsuper)); #ifdef WORDS_BIGENDIAN if (jsuper.s_magic == ext2fs_swab16(EXT2_SUPER_MAGIC)) ext2fs_swap_super(&jsuper); #endif if (jsuper.s_magic != EXT2_SUPER_MAGIC || !ext2fs_has_feature_journal_dev(&jsuper)) { retval = EXT2_ET_LOAD_EXT_JOURNAL; brelse(bh); goto errout; } /* Make sure the journal UUID is correct */ if (memcmp(jsuper.s_uuid, fs->super->s_journal_uuid, sizeof(jsuper.s_uuid))) { retval = EXT2_ET_LOAD_EXT_JOURNAL; brelse(bh); goto errout; } /* Check the superblock checksum */ if (ext2fs_has_feature_metadata_csum(&jsuper)) { struct struct_ext2_filsys fsx; struct ext2_super_block superx; void *p; p = start ? bh->b_data : bh->b_data + SUPERBLOCK_OFFSET; memcpy(&fsx, fs, sizeof(fsx)); memcpy(&superx, fs->super, sizeof(superx)); fsx.super = &superx; ext2fs_set_feature_metadata_csum(fsx.super); if (!ext2fs_superblock_csum_verify(&fsx, p)) { retval = EXT2_ET_LOAD_EXT_JOURNAL; brelse(bh); goto errout; } } brelse(bh); maxlen = ext2fs_blocks_count(&jsuper); journal->j_maxlen = (maxlen < 1ULL << 32) ? maxlen : (1ULL << 32) - 1; start++; } bh = getblk(dev_journal, start, journal->j_blocksize); if (!bh) { retval = EXT2_ET_NO_MEMORY; goto errout; } journal->j_sb_buffer = bh; journal->j_superblock = (journal_superblock_t *)bh->b_data; #ifdef USE_INODE_IO if (j_inode) ext2fs_free_mem(&j_inode); #endif *ret_journal = journal; return 0; errout: if (dev_fs) ext2fs_free_mem(&dev_fs); if (j_inode) ext2fs_free_mem(&j_inode); if (journal) ext2fs_free_mem(&journal); return retval; }