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 union { struct { 47 struct adfs_discmap *s_map; /* bh list containing map */ 48 struct adfs_dir_ops *s_dir; /* directory operations */ 49 }; 50 struct rcu_head rcu; /* used only at shutdown time */ 51 }; 52 kuid_t s_uid; /* owner uid */ 53 kgid_t s_gid; /* owner gid */ 54 umode_t s_owner_mask; /* ADFS owner perm -> unix perm */ 55 umode_t s_other_mask; /* ADFS other perm -> unix perm */ 56 int s_ftsuffix; /* ,xyz hex filetype suffix option */ 57 58 __u32 s_ids_per_zone; /* max. no ids in one zone */ 59 __u32 s_idlen; /* length of ID in map */ 60 __u32 s_map_size; /* sector size of a map */ 61 unsigned long s_size; /* total size (in blocks) of this fs */ 62 signed int s_map2blk; /* shift left by this for map->sector */ 63 unsigned int s_log2sharesize;/* log2 share size */ 64 __le32 s_version; /* disc format version */ 65 unsigned int s_namelen; /* maximum number of characters in name */ 66 }; 67 68 static inline struct adfs_sb_info *ADFS_SB(struct super_block *sb) 69 { 70 return sb->s_fs_info; 71 } 72 73 static inline struct adfs_inode_info *ADFS_I(struct inode *inode) 74 { 75 return container_of(inode, struct adfs_inode_info, vfs_inode); 76 } 77 78 /* 79 * Directory handling 80 */ 81 struct adfs_dir { 82 struct super_block *sb; 83 84 int nr_buffers; 85 struct buffer_head *bh[4]; 86 87 /* big directories need allocated buffers */ 88 struct buffer_head **bh_fplus; 89 90 unsigned int pos; 91 unsigned int parent_id; 92 93 struct adfs_dirheader dirhead; 94 union adfs_dirtail dirtail; 95 }; 96 97 /* 98 * This is the overall maximum name length 99 */ 100 #define ADFS_MAX_NAME_LEN (256 + 4) /* +4 for ,xyz hex filetype suffix */ 101 struct object_info { 102 __u32 parent_id; /* parent object id */ 103 __u32 file_id; /* object id */ 104 __u32 loadaddr; /* load address */ 105 __u32 execaddr; /* execution address */ 106 __u32 size; /* size */ 107 __u8 attr; /* RISC OS attributes */ 108 unsigned int name_len; /* name length */ 109 char name[ADFS_MAX_NAME_LEN];/* file name */ 110 111 /* RISC OS file type (12-bit: derived from loadaddr) */ 112 __u16 filetype; 113 }; 114 115 /* RISC OS 12-bit filetype converts to ,xyz hex filename suffix */ 116 static inline int append_filetype_suffix(char *buf, __u16 filetype) 117 { 118 if (filetype == 0xffff) /* no explicit 12-bit file type was set */ 119 return 0; 120 121 *buf++ = ','; 122 *buf++ = hex_asc_lo(filetype >> 8); 123 *buf++ = hex_asc_lo(filetype >> 4); 124 *buf++ = hex_asc_lo(filetype >> 0); 125 return 4; 126 } 127 128 struct adfs_dir_ops { 129 int (*read)(struct super_block *sb, unsigned int id, unsigned int sz, struct adfs_dir *dir); 130 int (*setpos)(struct adfs_dir *dir, unsigned int fpos); 131 int (*getnext)(struct adfs_dir *dir, struct object_info *obj); 132 int (*update)(struct adfs_dir *dir, struct object_info *obj); 133 int (*create)(struct adfs_dir *dir, struct object_info *obj); 134 int (*remove)(struct adfs_dir *dir, struct object_info *obj); 135 int (*sync)(struct adfs_dir *dir); 136 void (*free)(struct adfs_dir *dir); 137 }; 138 139 struct adfs_discmap { 140 struct buffer_head *dm_bh; 141 __u32 dm_startblk; 142 unsigned int dm_startbit; 143 unsigned int dm_endbit; 144 }; 145 146 /* Inode stuff */ 147 struct inode *adfs_iget(struct super_block *sb, struct object_info *obj); 148 int adfs_write_inode(struct inode *inode, struct writeback_control *wbc); 149 int adfs_notify_change(struct dentry *dentry, struct iattr *attr); 150 151 /* map.c */ 152 extern int adfs_map_lookup(struct super_block *sb, unsigned int frag_id, unsigned int offset); 153 extern unsigned int adfs_map_free(struct super_block *sb); 154 155 /* Misc */ 156 __printf(3, 4) 157 void __adfs_error(struct super_block *sb, const char *function, 158 const char *fmt, ...); 159 #define adfs_error(sb, fmt...) __adfs_error(sb, __func__, fmt) 160 161 /* super.c */ 162 163 /* 164 * Inodes and file operations 165 */ 166 167 /* dir_*.c */ 168 extern const struct inode_operations adfs_dir_inode_operations; 169 extern const struct file_operations adfs_dir_operations; 170 extern const struct dentry_operations adfs_dentry_operations; 171 extern struct adfs_dir_ops adfs_f_dir_ops; 172 extern struct adfs_dir_ops adfs_fplus_dir_ops; 173 174 extern int adfs_dir_update(struct super_block *sb, struct object_info *obj, 175 int wait); 176 177 /* file.c */ 178 extern const struct inode_operations adfs_file_inode_operations; 179 extern const struct file_operations adfs_file_operations; 180 181 static inline __u32 signed_asl(__u32 val, signed int shift) 182 { 183 if (shift >= 0) 184 val <<= shift; 185 else 186 val >>= -shift; 187 return val; 188 } 189 190 /* 191 * Calculate the address of a block in an object given the block offset 192 * and the object identity. 193 * 194 * The root directory ID should always be looked up in the map [3.4] 195 */ 196 static inline int 197 __adfs_block_map(struct super_block *sb, unsigned int object_id, 198 unsigned int block) 199 { 200 if (object_id & 255) { 201 unsigned int off; 202 203 off = (object_id & 255) - 1; 204 block += off << ADFS_SB(sb)->s_log2sharesize; 205 } 206 207 return adfs_map_lookup(sb, object_id >> 8, block); 208 } 209