1 files changed, 230 insertions, 0 deletions
diff --git a/fs/adfs/adfs.h b/fs/adfs/adfs.h
new file mode 100644
index 000000000..06b7c9234
--- /dev/null
+++ b/fs/adfs/adfs.h
@@ -0,0 +1,230 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#include <linux/buffer_head.h>
+#include <linux/fs.h>
+#include <linux/adfs_fs.h>
+
+/* Internal data structures for ADFS */
+
+#define ADFS_FREE_FRAG		 0
+#define ADFS_BAD_FRAG		 1
+#define ADFS_ROOT_FRAG		 2
+
+#define ADFS_FILETYPE_NONE	((u16)~0)
+
+/* RISC OS 12-bit filetype is stored in load_address[19:8] */
+static inline u16 adfs_filetype(u32 loadaddr)
+{
+	return (loadaddr & 0xfff00000) == 0xfff00000 ?
+	       (loadaddr >> 8) & 0xfff : ADFS_FILETYPE_NONE;
+}
+
+#define ADFS_NDA_OWNER_READ	(1 << 0)
+#define ADFS_NDA_OWNER_WRITE	(1 << 1)
+#define ADFS_NDA_LOCKED		(1 << 2)
+#define ADFS_NDA_DIRECTORY	(1 << 3)
+#define ADFS_NDA_EXECUTE	(1 << 4)
+#define ADFS_NDA_PUBLIC_READ	(1 << 5)
+#define ADFS_NDA_PUBLIC_WRITE	(1 << 6)
+
+/*
+ * adfs file system inode data in memory
+ */
+struct adfs_inode_info {
+	loff_t		mmu_private;
+	__u32		parent_id;	/* parent indirect disc address	*/
+	__u32		indaddr;	/* object indirect disc address	*/
+	__u32		loadaddr;	/* RISC OS load address		*/
+	__u32		execaddr;	/* RISC OS exec address		*/
+	unsigned int	attr;		/* RISC OS permissions		*/
+	struct inode vfs_inode;
+};
+
+static inline struct adfs_inode_info *ADFS_I(struct inode *inode)
+{
+	return container_of(inode, struct adfs_inode_info, vfs_inode);
+}
+
+static inline bool adfs_inode_is_stamped(struct inode *inode)
+{
+	return (ADFS_I(inode)->loadaddr & 0xfff00000) == 0xfff00000;
+}
+
+/*
+ * Forward-declare this
+ */
+struct adfs_discmap;
+struct adfs_dir_ops;
+
+/*
+ * ADFS file system superblock data in memory
+ */
+struct adfs_sb_info {
+	union { struct {
+		struct adfs_discmap *s_map;	/* bh list containing map */
+		const struct adfs_dir_ops *s_dir; /* directory operations */
+		};
+		struct rcu_head rcu;	/* used only at shutdown time	 */
+	};
+	kuid_t		s_uid;		/* owner uid */
+	kgid_t		s_gid;		/* owner gid */
+	umode_t		s_owner_mask;	/* ADFS owner perm -> unix perm */
+	umode_t		s_other_mask;	/* ADFS other perm -> unix perm	*/
+	int		s_ftsuffix;	/* ,xyz hex filetype suffix option */
+
+	__u32		s_ids_per_zone;	/* max. no ids in one zone */
+	__u32		s_idlen;	/* length of ID in map */
+	__u32		s_map_size;	/* sector size of a map	*/
+	signed int	s_map2blk;	/* shift left by this for map->sector*/
+	unsigned int	s_log2sharesize;/* log2 share size */
+	unsigned int	s_namelen;	/* maximum number of characters in name	 */
+};
+
+static inline struct adfs_sb_info *ADFS_SB(struct super_block *sb)
+{
+	return sb->s_fs_info;
+}
+
+/*
+ * Directory handling
+ */
+struct adfs_dir {
+	struct super_block	*sb;
+
+	int			nr_buffers;
+	struct buffer_head	*bh[4];
+	struct buffer_head	**bhs;
+
+	unsigned int		pos;
+	__u32			parent_id;
+
+	union {
+		struct adfs_dirheader	*dirhead;
+		struct adfs_bigdirheader *bighead;
+	};
+	union {
+		struct adfs_newdirtail	*newtail;
+		struct adfs_bigdirtail	*bigtail;
+	};
+};
+
+/*
+ * This is the overall maximum name length
+ */
+#define ADFS_MAX_NAME_LEN	(256 + 4) /* +4 for ,xyz hex filetype suffix */
+struct object_info {
+	__u32		parent_id;		/* parent object id	*/
+	__u32		indaddr;		/* indirect disc addr	*/
+	__u32		loadaddr;		/* load address		*/
+	__u32		execaddr;		/* execution address	*/
+	__u32		size;			/* size			*/
+	__u8		attr;			/* RISC OS attributes	*/
+	unsigned int	name_len;		/* name length		*/
+	char		name[ADFS_MAX_NAME_LEN];/* file name		*/
+};
+
+struct adfs_dir_ops {
+	int	(*read)(struct super_block *sb, unsigned int indaddr,
+			unsigned int size, struct adfs_dir *dir);
+	int	(*iterate)(struct adfs_dir *dir, struct dir_context *ctx);
+	int	(*setpos)(struct adfs_dir *dir, unsigned int fpos);
+	int	(*getnext)(struct adfs_dir *dir, struct object_info *obj);
+	int	(*update)(struct adfs_dir *dir, struct object_info *obj);
+	int	(*create)(struct adfs_dir *dir, struct object_info *obj);
+	int	(*remove)(struct adfs_dir *dir, struct object_info *obj);
+	int	(*commit)(struct adfs_dir *dir);
+};
+
+struct adfs_discmap {
+	struct buffer_head	*dm_bh;
+	__u32			dm_startblk;
+	unsigned int		dm_startbit;
+	unsigned int		dm_endbit;
+};
+
+/* Inode stuff */
+struct inode *adfs_iget(struct super_block *sb, struct object_info *obj);
+int adfs_write_inode(struct inode *inode, struct writeback_control *wbc);
+int adfs_notify_change(struct user_namespace *mnt_userns, struct dentry *dentry,
+		       struct iattr *attr);
+
+/* map.c */
+int adfs_map_lookup(struct super_block *sb, u32 frag_id, unsigned int offset);
+void adfs_map_statfs(struct super_block *sb, struct kstatfs *buf);
+struct adfs_discmap *adfs_read_map(struct super_block *sb, struct adfs_discrecord *dr);
+void adfs_free_map(struct super_block *sb);
+
+/* Misc */
+__printf(3, 4)
+void __adfs_error(struct super_block *sb, const char *function,
+		  const char *fmt, ...);
+#define adfs_error(sb, fmt...) __adfs_error(sb, __func__, fmt)
+void adfs_msg(struct super_block *sb, const char *pfx, const char *fmt, ...);
+
+/* super.c */
+
+/*
+ * Inodes and file operations
+ */
+
+/* dir_*.c */
+extern const struct inode_operations adfs_dir_inode_operations;
+extern const struct file_operations adfs_dir_operations;
+extern const struct dentry_operations adfs_dentry_operations;
+extern const struct adfs_dir_ops adfs_f_dir_ops;
+extern const struct adfs_dir_ops adfs_fplus_dir_ops;
+
+int adfs_dir_copyfrom(void *dst, struct adfs_dir *dir, unsigned int offset,
+		      size_t len);
+int adfs_dir_copyto(struct adfs_dir *dir, unsigned int offset, const void *src,
+		    size_t len);
+void adfs_dir_relse(struct adfs_dir *dir);
+int adfs_dir_read_buffers(struct super_block *sb, u32 indaddr,
+			  unsigned int size, struct adfs_dir *dir);
+void adfs_object_fixup(struct adfs_dir *dir, struct object_info *obj);
+extern int adfs_dir_update(struct super_block *sb, struct object_info *obj,
+			   int wait);
+
+/* file.c */
+extern const struct inode_operations adfs_file_inode_operations;
+extern const struct file_operations adfs_file_operations;
+
+static inline __u32 signed_asl(__u32 val, signed int shift)
+{
+	if (shift >= 0)
+		val <<= shift;
+	else
+		val >>= -shift;
+	return val;
+}
+
+/*
+ * Calculate the address of a block in an object given the block offset
+ * and the object identity.
+ *
+ * The root directory ID should always be looked up in the map [3.4]
+ */
+static inline int __adfs_block_map(struct super_block *sb, u32 indaddr,
+				   unsigned int block)
+{
+	if (indaddr & 255) {
+		unsigned int off;
+
+		off = (indaddr & 255) - 1;
+		block += off << ADFS_SB(sb)->s_log2sharesize;
+	}
+
+	return adfs_map_lookup(sb, indaddr >> 8, block);
+}
+
+/* Return the disc record from the map */
+static inline
+struct adfs_discrecord *adfs_map_discrecord(struct adfs_discmap *dm)
+{
+	return (void *)(dm[0].dm_bh->b_data + 4);
+}
+
+static inline u64 adfs_disc_size(const struct adfs_discrecord *dr)
+{
+	return (u64)le32_to_cpu(dr->disc_size_high) << 32 |
+		    le32_to_cpu(dr->disc_size);
+}