/* * linux/fs/hfsplus/wrapper.c * * Copyright (C) 2001 * Brad Boyer (flar@allandria.com) * (C) 2003 Ardis Technologies * * Handling of HFS wrappers around HFS+ volumes */ #include #include #include #include #include #include "hfsplus_fs.h" #include "hfsplus_raw.h" struct hfsplus_wd { u32 ablk_size; u16 ablk_start; u16 embed_start; u16 embed_count; }; static void hfsplus_end_io_sync(struct bio *bio, int err) { if (err) clear_bit(BIO_UPTODATE, &bio->bi_flags); complete(bio->bi_private); } int hfsplus_submit_bio(struct block_device *bdev, sector_t sector, void *data, int rw) { DECLARE_COMPLETION_ONSTACK(wait); struct bio *bio; int ret = 0; bio = bio_alloc(GFP_NOIO, 1); bio->bi_sector = sector; bio->bi_bdev = bdev; bio->bi_end_io = hfsplus_end_io_sync; bio->bi_private = &wait; /* * We always submit one sector at a time, so bio_add_page must not fail. */ if (bio_add_page(bio, virt_to_page(data), HFSPLUS_SECTOR_SIZE, offset_in_page(data)) != HFSPLUS_SECTOR_SIZE) BUG(); submit_bio(rw, bio); wait_for_completion(&wait); if (!bio_flagged(bio, BIO_UPTODATE)) ret = -EIO; bio_put(bio); return ret; } static int hfsplus_read_mdb(void *bufptr, struct hfsplus_wd *wd) { u32 extent; u16 attrib; __be16 sig; sig = *(__be16 *)(bufptr + HFSP_WRAPOFF_EMBEDSIG); if (sig != cpu_to_be16(HFSPLUS_VOLHEAD_SIG) && sig != cpu_to_be16(HFSPLUS_VOLHEAD_SIGX)) return 0; attrib = be16_to_cpu(*(__be16 *)(bufptr + HFSP_WRAPOFF_ATTRIB)); if (!(attrib & HFSP_WRAP_ATTRIB_SLOCK) || !(attrib & HFSP_WRAP_ATTRIB_SPARED)) return 0; wd->ablk_size = be32_to_cpu(*(__be32 *)(bufptr + HFSP_WRAPOFF_ABLKSIZE)); if (wd->ablk_size < HFSPLUS_SECTOR_SIZE) return 0; if (wd->ablk_size % HFSPLUS_SECTOR_SIZE) return 0; wd->ablk_start = be16_to_cpu(*(__be16 *)(bufptr + HFSP_WRAPOFF_ABLKSTART)); extent = get_unaligned_be32(bufptr + HFSP_WRAPOFF_EMBEDEXT); wd->embed_start = (extent >> 16) & 0xFFFF; wd->embed_count = extent & 0xFFFF; return 1; } static int hfsplus_get_last_session(struct super_block *sb, sector_t *start, sector_t *size) { struct cdrom_multisession ms_info; struct cdrom_tocentry te; int res; /* default values */ *start = 0; *size = sb->s_bdev->bd_inode->i_size >> 9; if (HFSPLUS_SB(sb).session >= 0) { te.cdte_track = HFSPLUS_SB(sb).session; te.cdte_format = CDROM_LBA; res = ioctl_by_bdev(sb->s_bdev, CDROMREADTOCENTRY, (unsigned long)&te); if (!res && (te.cdte_ctrl & CDROM_DATA_TRACK) == 4) { *start = (sector_t)te.cdte_addr.lba << 2; return 0; } printk(KERN_ERR "hfs: invalid session number or type of track\n"); return -EINVAL; } ms_info.addr_format = CDROM_LBA; res = ioctl_by_bdev(sb->s_bdev, CDROMMULTISESSION, (unsigned long)&ms_info); if (!res && ms_info.xa_flag) *start = (sector_t)ms_info.addr.lba << 2; return 0; } /* Find the volume header and fill in some minimum bits in superblock */ /* Takes in super block, returns true if good data read */ int hfsplus_read_wrapper(struct super_block *sb) { struct buffer_head *bh; struct hfsplus_vh *vhdr; struct hfsplus_wd wd; sector_t part_start, part_size; u32 blocksize; int error = 0; error = -EINVAL; blocksize = sb_min_blocksize(sb, HFSPLUS_SECTOR_SIZE); if (!blocksize) goto out; if (hfsplus_get_last_session(sb, &part_start, &part_size)) goto out; printk(KERN_EMERG"part_start=%x, part_size=%x",part_start,part_size); #if 0 if ((u64)part_start + part_size > 0x100000000ULL) { pr_err("hfs: volumes larger than 2TB are not supported yet\n"); goto out; } #endif HFSPLUS_SB(sb).s_vhdr=NULL; error = -ENOMEM; /* HFSPLUS_SB(sb).s_vhdr = kmalloc(HFSPLUS_SECTOR_SIZE, GFP_KERNEL); if (!HFSPLUS_SB(sb).s_vhdr) goto out; HFSPLUS_SB(sb).s_backup_vhdr = kmalloc(HFSPLUS_SECTOR_SIZE, GFP_KERNEL); if (!HFSPLUS_SB(sb).s_backup_vhdr) goto out_free_vhdr; */ /* Removed by Foxconn Antony 08/20/2013 end */ reread: bh = sb_bread512(sb, part_start + HFSPLUS_VOLHEAD_SECTOR, vhdr); if (!bh) { goto out_free_backup_vhdr; } error = -EINVAL; switch (vhdr->signature) { case cpu_to_be16(HFSPLUS_VOLHEAD_SIGX): set_bit(HFSPLUS_SB_HFSX, &HFSPLUS_SB(sb).flags); /*FALLTHRU*/ case cpu_to_be16(HFSPLUS_VOLHEAD_SIG): break; case cpu_to_be16(HFSP_WRAP_MAGIC): if (!hfsplus_read_mdb(vhdr, &wd)) goto out_free_backup_vhdr; wd.ablk_size >>= HFSPLUS_SECTOR_SHIFT; part_start += wd.ablk_start + wd.embed_start * wd.ablk_size; part_size = wd.embed_count * wd.ablk_size; brelse(bh); goto reread; default: /* * Check for a partition block. * * (should do this only for cdrom/loop though) */ brelse(bh); if (hfs_part_find(sb, &part_start, &part_size)) { goto out_free_backup_vhdr; } goto reread; } blocksize = be32_to_cpu(vhdr->blocksize); brelse(bh); /* block size must be at least as large as a sector * and a multiple of 2 */ if (blocksize < HFSPLUS_SECTOR_SIZE || ((blocksize - 1) & blocksize)) goto out_free_backup_vhdr; HFSPLUS_SB(sb).alloc_blksz = blocksize; HFSPLUS_SB(sb).alloc_blksz_shift = 0; while ((blocksize >>= 1) != 0) HFSPLUS_SB(sb).alloc_blksz_shift++; blocksize = min(HFSPLUS_SB(sb).alloc_blksz, (u32)PAGE_SIZE); /* align block size to block offset */ while (part_start & ((blocksize >> HFSPLUS_SECTOR_SHIFT) - 1)) blocksize >>= 1; if (sb_set_blocksize(sb, blocksize) != blocksize) { printk(KERN_ERR "hfs: unable to set blocksize to %u!\n", blocksize); goto out_free_backup_vhdr; } HFSPLUS_SB(sb).blockoffset = part_start >> (sb->s_blocksize_bits - HFSPLUS_SECTOR_SHIFT); HFSPLUS_SB(sb).part_start = part_start; HFSPLUS_SB(sb).sect_count = part_size; HFSPLUS_SB(sb).fs_shift = HFSPLUS_SB(sb).alloc_blksz_shift - sb->s_blocksize_bits; bh = sb_bread512(sb, part_start + HFSPLUS_VOLHEAD_SECTOR, vhdr); if(!bh) goto out_free_backup_vhdr; HFSPLUS_SB(sb).s_vhbh = bh; HFSPLUS_SB(sb).s_vhdr = vhdr; return 0; out_free_backup_vhdr: // if(HFSPLUS_SB(sb).s_backup_vhdr) // kfree(HFSPLUS_SB(sb).s_backup_vhdr); out_free_vhdr: // if(HFSPLUS_SB(sb).s_vhdr) // kfree(HFSPLUS_SB(sb).s_vhdr); out: // brelse(bh); return error; }