static int affs_fill_super(struct super_block *sb, void *data, int silent) { struct affs_sb_info *sbi; struct buffer_head *root_bh = NULL; struct buffer_head *boot_bh; struct inode *root_inode = NULL; s32 root_block; int size, blocksize; u32 chksum; int num_bm; int i, j; s32 key; uid_t uid; gid_t gid; int reserved; unsigned long mount_flags; int tmp_flags; /* fix remount prototype... */ u8 sig[4]; int ret = -EINVAL; save_mount_options(sb, data); pr_debug("AFFS: read_super(%s)\n",data ? (const char *)data : "no options"); sb->s_magic = AFFS_SUPER_MAGIC; sb->s_op = &affs_sops; sb->s_flags |= MS_NODIRATIME; sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL); if (!sbi) return -ENOMEM; sb->s_fs_info = sbi; mutex_init(&sbi->s_bmlock); spin_lock_init(&sbi->symlink_lock); if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block, &blocksize,&sbi->s_prefix, sbi->s_volume, &mount_flags)) { printk(KERN_ERR "AFFS: Error parsing options\n"); kfree(sbi->s_prefix); kfree(sbi); return -EINVAL; } /* N.B. after this point s_prefix must be released */ sbi->s_flags = mount_flags; sbi->s_mode = i; sbi->s_uid = uid; sbi->s_gid = gid; sbi->s_reserved= reserved; /* Get the size of the device in 512-byte blocks. * If we later see that the partition uses bigger * blocks, we will have to change it. */ size = sb->s_bdev->bd_inode->i_size >> 9; pr_debug("AFFS: initial blocksize=%d, #blocks=%d\n", 512, size); affs_set_blocksize(sb, PAGE_SIZE); /* Try to find root block. Its location depends on the block size. */ i = 512; j = 4096; if (blocksize > 0) { i = j = blocksize; size = size / (blocksize / 512); } for (blocksize = i, key = 0; blocksize <= j; blocksize <<= 1, size >>= 1) { sbi->s_root_block = root_block; if (root_block < 0) sbi->s_root_block = (reserved + size - 1) / 2; pr_debug("AFFS: setting blocksize to %d\n", blocksize); affs_set_blocksize(sb, blocksize); sbi->s_partition_size = size; /* The root block location that was calculated above is not * correct if the partition size is an odd number of 512- * byte blocks, which will be rounded down to a number of * 1024-byte blocks, and if there were an even number of * reserved blocks. Ideally, all partition checkers should * report the real number of blocks of the real blocksize, * but since this just cannot be done, we have to try to * find the root block anyways. In the above case, it is one * block behind the calculated one. So we check this one, too. */ for (num_bm = 0; num_bm < 2; num_bm++) { pr_debug("AFFS: Dev %s, trying root=%u, bs=%d, " "size=%d, reserved=%d\n", sb->s_id, sbi->s_root_block + num_bm, blocksize, size, reserved); root_bh = affs_bread(sb, sbi->s_root_block + num_bm); if (!root_bh) continue; if (!affs_checksum_block(sb, root_bh) && be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT && be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) { sbi->s_hashsize = blocksize / 4 - 56; sbi->s_root_block += num_bm; key = 1; goto got_root; } affs_brelse(root_bh); root_bh = NULL; } } if (!silent) printk(KERN_ERR "AFFS: No valid root block on device %s\n", sb->s_id); goto out_error; /* N.B. after this point bh must be released */ got_root: root_block = sbi->s_root_block; /* Find out which kind of FS we have */ boot_bh = sb_bread(sb, 0); if (!boot_bh) { printk(KERN_ERR "AFFS: Cannot read boot block\n"); goto out_error; } memcpy(sig, boot_bh->b_data, 4); brelse(boot_bh); chksum = be32_to_cpu(*(__be32 *)sig); /* Dircache filesystems are compatible with non-dircache ones * when reading. As long as they aren't supported, writing is * not recommended. */ if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS || chksum == MUFS_DCOFS) && !(sb->s_flags & MS_RDONLY)) { printk(KERN_NOTICE "AFFS: Dircache FS - mounting %s read only\n", sb->s_id); sb->s_flags |= MS_RDONLY; } switch (chksum) { case MUFS_FS: case MUFS_INTLFFS: case MUFS_DCFFS: sbi->s_flags |= SF_MUFS; /* fall thru */ case FS_INTLFFS: case FS_DCFFS: sbi->s_flags |= SF_INTL; break; case MUFS_FFS: sbi->s_flags |= SF_MUFS; break; case FS_FFS: break; case MUFS_OFS: sbi->s_flags |= SF_MUFS; /* fall thru */ case FS_OFS: sbi->s_flags |= SF_OFS; sb->s_flags |= MS_NOEXEC; break; case MUFS_DCOFS: case MUFS_INTLOFS: sbi->s_flags |= SF_MUFS; case FS_DCOFS: case FS_INTLOFS: sbi->s_flags |= SF_INTL | SF_OFS; sb->s_flags |= MS_NOEXEC; break; default: printk(KERN_ERR "AFFS: Unknown filesystem on device %s: %08X\n", sb->s_id, chksum); goto out_error; } if (mount_flags & SF_VERBOSE) { u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0]; printk(KERN_NOTICE "AFFS: Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n", len > 31 ? 31 : len, AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1, sig, sig[3] + '0', blocksize); } sb->s_flags |= MS_NODEV | MS_NOSUID; sbi->s_data_blksize = sb->s_blocksize; if (sbi->s_flags & SF_OFS) sbi->s_data_blksize -= 24; /* Keep super block in cache */ sbi->s_root_bh = root_bh; /* N.B. after this point s_root_bh must be released */ tmp_flags = sb->s_flags; if (affs_init_bitmap(sb, &tmp_flags)) goto out_error; sb->s_flags = tmp_flags; /* set up enough so that it can read an inode */ root_inode = affs_iget(sb, root_block); if (IS_ERR(root_inode)) { ret = PTR_ERR(root_inode); goto out_error_noinode; } sb->s_root = d_alloc_root(root_inode); if (!sb->s_root) { printk(KERN_ERR "AFFS: Get root inode failed\n"); goto out_error; } sb->s_root->d_op = &affs_dentry_operations; pr_debug("AFFS: s_flags=%lX\n",sb->s_flags); return 0; /* * Begin the cascaded cleanup ... */ out_error: if (root_inode) iput(root_inode); out_error_noinode: kfree(sbi->s_bitmap); affs_brelse(root_bh); kfree(sbi->s_prefix); kfree(sbi); sb->s_fs_info = NULL; return ret; }
static struct super_block * affs_read_super(struct super_block *sb, void *data, int silent) { struct buffer_head *root_bh = NULL; struct buffer_head *boot_bh; struct inode *root_inode = NULL; kdev_t dev = sb->s_dev; s32 root_block; int blocks, size, blocksize; u32 chksum; int num_bm; int i, j; s32 key; uid_t uid; gid_t gid; int reserved; unsigned long mount_flags; pr_debug("AFFS: read_super(%s)\n",data ? (const char *)data : "no options"); sb->s_magic = AFFS_SUPER_MAGIC; sb->s_op = &affs_sops; memset(AFFS_SB, 0, sizeof(struct affs_sb_info)); init_MUTEX(&AFFS_SB->s_bmlock); if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block, &blocksize,&AFFS_SB->s_prefix, AFFS_SB->s_volume, &mount_flags)) { printk(KERN_ERR "AFFS: Error parsing options\n"); return NULL; } /* N.B. after this point s_prefix must be released */ AFFS_SB->s_flags = mount_flags; AFFS_SB->s_mode = i; AFFS_SB->s_uid = uid; AFFS_SB->s_gid = gid; AFFS_SB->s_reserved= reserved; /* Get the size of the device in 512-byte blocks. * If we later see that the partition uses bigger * blocks, we will have to change it. */ blocks = blk_size[MAJOR(dev)] ? blk_size[MAJOR(dev)][MINOR(dev)] : 0; if (!blocks) { printk(KERN_ERR "AFFS: Could not determine device size\n"); goto out_error; } size = (BLOCK_SIZE / 512) * blocks; pr_debug("AFFS: initial blksize=%d, blocks=%d\n", 512, blocks); affs_set_blocksize(sb, PAGE_SIZE); /* Try to find root block. Its location depends on the block size. */ i = 512; j = 4096; if (blocksize > 0) { i = j = blocksize; size = size / (blocksize / 512); } for (blocksize = i, key = 0; blocksize <= j; blocksize <<= 1, size >>= 1) { AFFS_SB->s_root_block = root_block; if (root_block < 0) AFFS_SB->s_root_block = (reserved + size - 1) / 2; pr_debug("AFFS: setting blocksize to %d\n", blocksize); affs_set_blocksize(sb, blocksize); AFFS_SB->s_partition_size = size; /* The root block location that was calculated above is not * correct if the partition size is an odd number of 512- * byte blocks, which will be rounded down to a number of * 1024-byte blocks, and if there were an even number of * reserved blocks. Ideally, all partition checkers should * report the real number of blocks of the real blocksize, * but since this just cannot be done, we have to try to * find the root block anyways. In the above case, it is one * block behind the calculated one. So we check this one, too. */ for (num_bm = 0; num_bm < 2; num_bm++) { pr_debug("AFFS: Dev %s, trying root=%u, bs=%d, " "size=%d, reserved=%d\n", kdevname(dev), AFFS_SB->s_root_block + num_bm, blocksize, size, reserved); root_bh = affs_bread(sb, AFFS_SB->s_root_block + num_bm); if (!root_bh) continue; if (!affs_checksum_block(sb, root_bh) && be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT && be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) { AFFS_SB->s_hashsize = blocksize / 4 - 56; AFFS_SB->s_root_block += num_bm; key = 1; goto got_root; } affs_brelse(root_bh); root_bh = NULL; } } if (!silent) printk(KERN_ERR "AFFS: No valid root block on device %s\n", kdevname(dev)); goto out_error; /* N.B. after this point bh must be released */ got_root: root_block = AFFS_SB->s_root_block; sb->s_blocksize_bits = blocksize == 512 ? 9 : blocksize == 1024 ? 10 : blocksize == 2048 ? 11 : 12; /* Find out which kind of FS we have */ boot_bh = bread(sb->s_dev, 0, sb->s_blocksize); if (!boot_bh) { printk(KERN_ERR "AFFS: Cannot read boot block\n"); goto out_error; } chksum = be32_to_cpu(*(u32 *)boot_bh->b_data); brelse(boot_bh); /* Dircache filesystems are compatible with non-dircache ones * when reading. As long as they aren't supported, writing is * not recommended. */ if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS || chksum == MUFS_DCOFS) && !(sb->s_flags & MS_RDONLY)) { printk(KERN_NOTICE "AFFS: Dircache FS - mounting %s read only\n", kdevname(dev)); sb->s_flags |= MS_RDONLY; AFFS_SB->s_flags |= SF_READONLY; } switch (chksum) { case MUFS_FS: case MUFS_INTLFFS: case MUFS_DCFFS: AFFS_SB->s_flags |= SF_MUFS; /* fall thru */ case FS_INTLFFS: case FS_DCFFS: AFFS_SB->s_flags |= SF_INTL; break; case MUFS_FFS: AFFS_SB->s_flags |= SF_MUFS; break; case FS_FFS: break; case MUFS_OFS: AFFS_SB->s_flags |= SF_MUFS; /* fall thru */ case FS_OFS: AFFS_SB->s_flags |= SF_OFS; sb->s_flags |= MS_NOEXEC; break; case MUFS_DCOFS: case MUFS_INTLOFS: AFFS_SB->s_flags |= SF_MUFS; case FS_DCOFS: case FS_INTLOFS: AFFS_SB->s_flags |= SF_INTL | SF_OFS; sb->s_flags |= MS_NOEXEC; break; default: printk(KERN_ERR "AFFS: Unknown filesystem on device %s: %08X\n", kdevname(dev), chksum); goto out_error; } if (mount_flags & SF_VERBOSE) { chksum = cpu_to_be32(chksum); printk(KERN_NOTICE "AFFS: Mounting volume \"%*s\": Type=%.3s\\%c, Blocksize=%d\n", AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0], AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1, (char *)&chksum,((char *)&chksum)[3] + '0',blocksize); } sb->s_flags |= MS_NODEV | MS_NOSUID; AFFS_SB->s_data_blksize = sb->s_blocksize; if (AFFS_SB->s_flags & SF_OFS) AFFS_SB->s_data_blksize -= 24; /* Keep super block in cache */ AFFS_SB->s_root_bh = root_bh; /* N.B. after this point s_root_bh must be released */ if (affs_init_bitmap(sb)) goto out_error; /* set up enough so that it can read an inode */ root_inode = iget(sb, root_block); sb->s_root = d_alloc_root(root_inode); if (!sb->s_root) { printk(KERN_ERR "AFFS: Get root inode failed\n"); goto out_error; } sb->s_root->d_op = &affs_dentry_operations; pr_debug("AFFS: s_flags=%lX\n",sb->s_flags); return sb; /* * Begin the cascaded cleanup ... */ out_error: if (root_inode) iput(root_inode); if (AFFS_SB->s_bitmap) kfree(AFFS_SB->s_bitmap); affs_brelse(root_bh); if (AFFS_SB->s_prefix) kfree(AFFS_SB->s_prefix); return NULL; }