1 #include <linux/fs.h> 2 #include <linux/adfs_fs.h> 3 4 /* Internal data structures for ADFS */ 5 6 #define ADFS_FREE_FRAG 0 7 #define ADFS_BAD_FRAG 1 8 #define ADFS_ROOT_FRAG 2 9 10 #define ADFS_NDA_OWNER_READ (1 << 0) 11 #define ADFS_NDA_OWNER_WRITE (1 << 1) 12 #define ADFS_NDA_LOCKED (1 << 2) 13 #define ADFS_NDA_DIRECTORY (1 << 3) 14 #define ADFS_NDA_EXECUTE (1 << 4) 15 #define ADFS_NDA_PUBLIC_READ (1 << 5) 16 #define ADFS_NDA_PUBLIC_WRITE (1 << 6) 17 18 #include "dir_f.h" 19 20 struct buffer_head; 21 22 /* 23 * adfs file system inode data in memory 24 */ 25 struct adfs_inode_info { 26 loff_t mmu_private; 27 unsigned long parent_id; /* object id of parent */ 28 __u32 loadaddr; /* RISC OS load address */ 29 __u32 execaddr; /* RISC OS exec address */ 30 unsigned int filetype; /* RISC OS file type */ 31 unsigned int attr; /* RISC OS permissions */ 32 unsigned int stamped:1; /* RISC OS file has date/time */ 33 struct inode vfs_inode; 34 }; 35 36 /* 37 * Forward-declare this 38 */ 39 struct adfs_discmap; 40 struct adfs_dir_ops; 41 42 /* 43 * ADFS file system superblock data in memory 44 */ 45 struct adfs_sb_info { 46 struct adfs_discmap *s_map; /* bh list containing map */ 47 struct adfs_dir_ops *s_dir; /* directory operations */ 48 49 kuid_t s_uid; /* owner uid */ 50 kgid_t s_gid; /* owner gid */ 51 umode_t s_owner_mask; /* ADFS owner perm -> unix perm */ 52 umode_t s_other_mask; /* ADFS other perm -> unix perm */ 53 int s_ftsuffix; /* ,xyz hex filetype suffix option */ 54 55 __u32 s_ids_per_zone; /* max. no ids in one zone */ 56 __u32 s_idlen; /* length of ID in map */ 57 __u32 s_map_size; /* sector size of a map */ 58 unsigned long s_size; /* total size (in blocks) of this fs */ 59 signed int s_map2blk; /* shift left by this for map->sector */ 60 unsigned int s_log2sharesize;/* log2 share size */ 61 __le32 s_version; /* disc format version */ 62 unsigned int s_namelen; /* maximum number of characters in name */ 63 }; 64 65 static inline struct adfs_sb_info *ADFS_SB(struct super_block *sb) 66 { 67 return sb->s_fs_info; 68 } 69 70 static inline struct adfs_inode_info *ADFS_I(struct inode *inode) 71 { 72 return container_of(inode, struct adfs_inode_info, vfs_inode); 73 } 74 75 /* 76 * Directory handling 77 */ 78 struct adfs_dir { 79 struct super_block *sb; 80 81 int nr_buffers; 82 struct buffer_head *bh[4]; 83 84 /* big directories need allocated buffers */ 85 struct buffer_head **bh_fplus; 86 87 unsigned int pos; 88 unsigned int parent_id; 89 90 struct adfs_dirheader dirhead; 91 union adfs_dirtail dirtail; 92 }; 93 94 /* 95 * This is the overall maximum name length 96 */ 97 #define ADFS_MAX_NAME_LEN (256 + 4) /* +4 for ,xyz hex filetype suffix */ 98 struct object_info { 99 __u32 parent_id; /* parent object id */ 100 __u32 file_id; /* object id */ 101 __u32 loadaddr; /* load address */ 102 __u32 execaddr; /* execution address */ 103 __u32 size; /* size */ 104 __u8 attr; /* RISC OS attributes */ 105 unsigned int name_len; /* name length */ 106 char name[ADFS_MAX_NAME_LEN];/* file name */ 107 108 /* RISC OS file type (12-bit: derived from loadaddr) */ 109 __u16 filetype; 110 }; 111 112 /* RISC OS 12-bit filetype converts to ,xyz hex filename suffix */ 113 static inline int append_filetype_suffix(char *buf, __u16 filetype) 114 { 115 if (filetype == 0xffff) /* no explicit 12-bit file type was set */ 116 return 0; 117 118 *buf++ = ','; 119 *buf++ = hex_asc_lo(filetype >> 8); 120 *buf++ = hex_asc_lo(filetype >> 4); 121 *buf++ = hex_asc_lo(filetype >> 0); 122 return 4; 123 } 124 125 struct adfs_dir_ops { 126 int (*read)(struct super_block *sb, unsigned int id, unsigned int sz, struct adfs_dir *dir); 127 int (*setpos)(struct adfs_dir *dir, unsigned int fpos); 128 int (*getnext)(struct adfs_dir *dir, struct object_info *obj); 129 int (*update)(struct adfs_dir *dir, struct object_info *obj); 130 int (*create)(struct adfs_dir *dir, struct object_info *obj); 131 int (*remove)(struct adfs_dir *dir, struct object_info *obj); 132 int (*sync)(struct adfs_dir *dir); 133 void (*free)(struct adfs_dir *dir); 134 }; 135 136 struct adfs_discmap { 137 struct buffer_head *dm_bh; 138 __u32 dm_startblk; 139 unsigned int dm_startbit; 140 unsigned int dm_endbit; 141 }; 142 143 /* Inode stuff */ 144 struct inode *adfs_iget(struct super_block *sb, struct object_info *obj); 145 int adfs_write_inode(struct inode *inode, struct writeback_control *wbc); 146 int adfs_notify_change(struct dentry *dentry, struct iattr *attr); 147 148 /* map.c */ 149 extern int adfs_map_lookup(struct super_block *sb, unsigned int frag_id, unsigned int offset); 150 extern unsigned int adfs_map_free(struct super_block *sb); 151 152 /* Misc */ 153 void __adfs_error(struct super_block *sb, const char *function, 154 const char *fmt, ...); 155 #define adfs_error(sb, fmt...) __adfs_error(sb, __func__, fmt) 156 157 /* super.c */ 158 159 /* 160 * Inodes and file operations 161 */ 162 163 /* dir_*.c */ 164 extern const struct inode_operations adfs_dir_inode_operations; 165 extern const struct file_operations adfs_dir_operations; 166 extern const struct dentry_operations adfs_dentry_operations; 167 extern struct adfs_dir_ops adfs_f_dir_ops; 168 extern struct adfs_dir_ops adfs_fplus_dir_ops; 169 170 extern int adfs_dir_update(struct super_block *sb, struct object_info *obj, 171 int wait); 172 173 /* file.c */ 174 extern const struct inode_operations adfs_file_inode_operations; 175 extern const struct file_operations adfs_file_operations; 176 177 static inline __u32 signed_asl(__u32 val, signed int shift) 178 { 179 if (shift >= 0) 180 val <<= shift; 181 else 182 val >>= -shift; 183 return val; 184 } 185 186 /* 187 * Calculate the address of a block in an object given the block offset 188 * and the object identity. 189 * 190 * The root directory ID should always be looked up in the map [3.4] 191 */ 192 static inline int 193 __adfs_block_map(struct super_block *sb, unsigned int object_id, 194 unsigned int block) 195 { 196 if (object_id & 255) { 197 unsigned int off; 198 199 off = (object_id & 255) - 1; 200 block += off << ADFS_SB(sb)->s_log2sharesize; 201 } 202 203 return adfs_map_lookup(sb, object_id >> 8, block); 204 } 205