1 /* Internal data structures for ADFS */ 2 3 #define ADFS_FREE_FRAG 0 4 #define ADFS_BAD_FRAG 1 5 #define ADFS_ROOT_FRAG 2 6 7 #define ADFS_NDA_OWNER_READ (1 << 0) 8 #define ADFS_NDA_OWNER_WRITE (1 << 1) 9 #define ADFS_NDA_LOCKED (1 << 2) 10 #define ADFS_NDA_DIRECTORY (1 << 3) 11 #define ADFS_NDA_EXECUTE (1 << 4) 12 #define ADFS_NDA_PUBLIC_READ (1 << 5) 13 #define ADFS_NDA_PUBLIC_WRITE (1 << 6) 14 15 #include "dir_f.h" 16 17 struct buffer_head; 18 19 /* 20 * Directory handling 21 */ 22 struct adfs_dir { 23 struct super_block *sb; 24 25 int nr_buffers; 26 struct buffer_head *bh[4]; 27 unsigned int pos; 28 unsigned int parent_id; 29 30 struct adfs_dirheader dirhead; 31 union adfs_dirtail dirtail; 32 }; 33 34 /* 35 * This is the overall maximum name length 36 */ 37 #define ADFS_MAX_NAME_LEN 256 38 struct object_info { 39 __u32 parent_id; /* parent object id */ 40 __u32 file_id; /* object id */ 41 __u32 loadaddr; /* load address */ 42 __u32 execaddr; /* execution address */ 43 __u32 size; /* size */ 44 __u8 attr; /* RISC OS attributes */ 45 unsigned char name_len; /* name length */ 46 char name[ADFS_MAX_NAME_LEN];/* file name */ 47 }; 48 49 struct adfs_dir_ops { 50 int (*read)(struct super_block *sb, unsigned int id, unsigned int sz, struct adfs_dir *dir); 51 int (*setpos)(struct adfs_dir *dir, unsigned int fpos); 52 int (*getnext)(struct adfs_dir *dir, struct object_info *obj); 53 int (*update)(struct adfs_dir *dir, struct object_info *obj); 54 int (*create)(struct adfs_dir *dir, struct object_info *obj); 55 int (*remove)(struct adfs_dir *dir, struct object_info *obj); 56 void (*free)(struct adfs_dir *dir); 57 }; 58 59 struct adfs_discmap { 60 struct buffer_head *dm_bh; 61 __u32 dm_startblk; 62 unsigned int dm_startbit; 63 unsigned int dm_endbit; 64 }; 65 66 /* Inode stuff */ 67 struct inode *adfs_iget(struct super_block *sb, struct object_info *obj); 68 int adfs_write_inode(struct inode *inode,int unused); 69 int adfs_notify_change(struct dentry *dentry, struct iattr *attr); 70 71 /* map.c */ 72 extern int adfs_map_lookup(struct super_block *sb, unsigned int frag_id, unsigned int offset); 73 extern unsigned int adfs_map_free(struct super_block *sb); 74 75 /* Misc */ 76 void __adfs_error(struct super_block *sb, const char *function, 77 const char *fmt, ...); 78 #define adfs_error(sb, fmt...) __adfs_error(sb, __func__, fmt) 79 80 /* super.c */ 81 82 /* 83 * Inodes and file operations 84 */ 85 86 /* dir_*.c */ 87 extern const struct inode_operations adfs_dir_inode_operations; 88 extern const struct file_operations adfs_dir_operations; 89 extern const struct dentry_operations adfs_dentry_operations; 90 extern struct adfs_dir_ops adfs_f_dir_ops; 91 extern struct adfs_dir_ops adfs_fplus_dir_ops; 92 93 extern int adfs_dir_update(struct super_block *sb, struct object_info *obj); 94 95 /* file.c */ 96 extern const struct inode_operations adfs_file_inode_operations; 97 extern const struct file_operations adfs_file_operations; 98 99 static inline __u32 signed_asl(__u32 val, signed int shift) 100 { 101 if (shift >= 0) 102 val <<= shift; 103 else 104 val >>= -shift; 105 return val; 106 } 107 108 /* 109 * Calculate the address of a block in an object given the block offset 110 * and the object identity. 111 * 112 * The root directory ID should always be looked up in the map [3.4] 113 */ 114 static inline int 115 __adfs_block_map(struct super_block *sb, unsigned int object_id, 116 unsigned int block) 117 { 118 if (object_id & 255) { 119 unsigned int off; 120 121 off = (object_id & 255) - 1; 122 block += off << ADFS_SB(sb)->s_log2sharesize; 123 } 124 125 return adfs_map_lookup(sb, object_id >> 8, block); 126 } 127