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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 | #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_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) #include "dir_f.h" struct buffer_head; /* * adfs file system inode data in memory */ struct adfs_inode_info { loff_t mmu_private; unsigned long parent_id; /* object id of parent */ __u32 loadaddr; /* RISC OS load address */ __u32 execaddr; /* RISC OS exec address */ unsigned int filetype; /* RISC OS file type */ unsigned int attr; /* RISC OS permissions */ unsigned int stamped:1; /* RISC OS file has date/time */ struct inode vfs_inode; }; /* * Forward-declare this */ struct adfs_discmap; struct adfs_dir_ops; /* * ADFS file system superblock data in memory */ struct adfs_sb_info { struct adfs_discmap *s_map; /* bh list containing map */ struct adfs_dir_ops *s_dir; /* directory operations */ uid_t s_uid; /* owner uid */ gid_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 */ unsigned long s_size; /* total size (in blocks) of this fs */ signed int s_map2blk; /* shift left by this for map->sector */ unsigned int s_log2sharesize;/* log2 share size */ __le32 s_version; /* disc format version */ 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; } static inline struct adfs_inode_info *ADFS_I(struct inode *inode) { return container_of(inode, struct adfs_inode_info, vfs_inode); } /* * Directory handling */ struct adfs_dir { struct super_block *sb; int nr_buffers; struct buffer_head *bh[4]; /* big directories need allocated buffers */ struct buffer_head **bh_fplus; unsigned int pos; unsigned int parent_id; struct adfs_dirheader dirhead; union adfs_dirtail dirtail; }; /* * 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 file_id; /* object id */ __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 */ /* RISC OS file type (12-bit: derived from loadaddr) */ __u16 filetype; }; /* RISC OS 12-bit filetype converts to ,xyz hex filename suffix */ static inline int append_filetype_suffix(char *buf, __u16 filetype) { if (filetype == 0xffff) /* no explicit 12-bit file type was set */ return 0; *buf++ = ','; *buf++ = hex_asc_lo(filetype >> 8); *buf++ = hex_asc_lo(filetype >> 4); *buf++ = hex_asc_lo(filetype >> 0); return 4; } struct adfs_dir_ops { int (*read)(struct super_block *sb, unsigned int id, unsigned int sz, struct adfs_dir *dir); 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 (*sync)(struct adfs_dir *dir); void (*free)(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 dentry *dentry, struct iattr *attr); /* map.c */ extern int adfs_map_lookup(struct super_block *sb, unsigned int frag_id, unsigned int offset); extern unsigned int adfs_map_free(struct super_block *sb); /* Misc */ void __adfs_error(struct super_block *sb, const char *function, const char *fmt, ...); #define adfs_error(sb, fmt...) __adfs_error(sb, __func__, 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 struct adfs_dir_ops adfs_f_dir_ops; extern struct adfs_dir_ops adfs_fplus_dir_ops; 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, unsigned int object_id, unsigned int block) { if (object_id & 255) { unsigned int off; off = (object_id & 255) - 1; block += off << ADFS_SB(sb)->s_log2sharesize; } return adfs_map_lookup(sb, object_id >> 8, block); } |