fs/cramfs/inode.c

50 static inline struct cramfs_sb_info *CRAMFS_SB(struct super_block *sb)
52 	return sb->s_fs_info;
90 static struct inode *get_cramfs_inode(struct super_block *sb,
96 	inode = iget_locked(sb, cramino(cramfs_inode, offset));
107 		    CRAMFS_SB(sb)->flags & CRAMFS_FLAG_EXT_BLOCK_POINTERS &&
108 		    CRAMFS_SB(sb)->linear_phys_addr)
183 static void *cramfs_blkdev_read(struct super_block *sb, unsigned int offset,
186 	struct address_space *mapping = sb->s_bdev->bd_inode->i_mapping;
202 		if (buffer_dev[i] != sb)
214 	devsize = bdev_nr_bytes(sb->s_bdev) >> PAGE_SHIFT;
235 	buffer_dev[buffer] = sb;
254 static void *cramfs_direct_read(struct super_block *sb, unsigned int offset,
257 	struct cramfs_sb_info *sbi = CRAMFS_SB(sb);
270 static void *cramfs_read(struct super_block *sb, unsigned int offset,
273 	struct cramfs_sb_info *sbi = CRAMFS_SB(sb);
276 		return cramfs_direct_read(sb, offset, len);
278 		return cramfs_blkdev_read(sb, offset, len);
448 	struct super_block *sb = inode->i_sb;
449 	struct cramfs_sb_info *sbi = CRAMFS_SB(sb);
485 static void cramfs_kill_sb(struct super_block *sb)
487 	struct cramfs_sb_info *sbi = CRAMFS_SB(sb);
489 	generic_shutdown_super(sb);
491 	if (IS_ENABLED(CONFIG_CRAMFS_MTD) && sb->s_mtd) {
493 			mtd_unpoint(sb->s_mtd, 0, sbi->mtd_point_size);
494 		put_mtd_device(sb->s_mtd);
495 		sb->s_mtd = NULL;
496 	} else if (IS_ENABLED(CONFIG_CRAMFS_BLOCKDEV) && sb->s_bdev) {
497 		sync_blockdev(sb->s_bdev);
498 		bdev_fput(sb->s_bdev_file);
510 static int cramfs_read_super(struct super_block *sb, struct fs_context *fc,
513 	struct cramfs_sb_info *sbi = CRAMFS_SB(sb);
522 	memcpy(super, cramfs_read(sb, 0, sizeof(*super)), sizeof(*super));
537 		       cramfs_read(sb, 512, sizeof(*super)),
588 static int cramfs_finalize_super(struct super_block *sb,
594 	sb->s_flags |= SB_RDONLY;
595 	sb->s_time_min = 0;
596 	sb->s_time_max = 0;
597 	sb->s_op = &cramfs_ops;
598 	root = get_cramfs_inode(sb, cramfs_root, 0);
601 	sb->s_root = d_make_root(root);
602 	if (!sb->s_root)
607 static int cramfs_blkdev_fill_super(struct super_block *sb, struct fs_context *fc)
616 	sb->s_fs_info = sbi;
622 	err = cramfs_read_super(sb, fc, &super);
625 	return cramfs_finalize_super(sb, &super.root);
628 static int cramfs_mtd_fill_super(struct super_block *sb, struct fs_context *fc)
637 	sb->s_fs_info = sbi;
640 	err = mtd_point(sb->s_mtd, 0, PAGE_SIZE, &sbi->mtd_point_size,
644 		       sb->s_mtd->name);
650 	err = cramfs_read_super(sb, fc, &super);
656 		sb->s_mtd->name, sbi->size/1024);
657 	mtd_unpoint(sb->s_mtd, 0, PAGE_SIZE);
658 	err = mtd_point(sb->s_mtd, 0, sbi->size, &sbi->mtd_point_size,
662 		       sb->s_mtd->name);
666 	return cramfs_finalize_super(sb, &super.root);
671 	struct super_block *sb = dentry->d_sb;
674 	if (sb->s_bdev)
675 		id = huge_encode_dev(sb->s_bdev->bd_dev);
676 	else if (sb->s_dev)
677 		id = huge_encode_dev(sb->s_dev);
681 	buf->f_blocks = CRAMFS_SB(sb)->blocks;
684 	buf->f_files = CRAMFS_SB(sb)->files;
697 	struct super_block *sb = inode->i_sb;
722 		de = cramfs_read(sb, OFFSET(inode) + offset, sizeof(*de)+CRAMFS_MAXPATHLEN);
825 		struct super_block *sb = inode->i_sb;
831 		block_ptr = *(u32 *) cramfs_read(sb, blkptr_offset, 4);
852 					cramfs_read(sb, block_start, 2);
866 					cramfs_read(sb, blkptr_offset - 4, 4);
877 						cramfs_read(sb, block_start, 2);
894 			       cramfs_read(sb, block_start, block_len),
900 				 cramfs_read(sb, block_start, block_len),