1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #include <linux/buffer_head.h> 3 #include <linux/fs.h> 4 #include <linux/adfs_fs.h> 5 6 /* Internal data structures for ADFS */ 7 8 #define ADFS_FREE_FRAG 0 9 #define ADFS_BAD_FRAG 1 10 #define ADFS_ROOT_FRAG 2 11 12 #define ADFS_FILETYPE_NONE ((u16)~0) 13 14 /* RISC OS 12-bit filetype is stored in load_address[19:8] */ 15 static inline u16 adfs_filetype(u32 loadaddr) 16 { 17 return (loadaddr & 0xfff00000) == 0xfff00000 ? 18 (loadaddr >> 8) & 0xfff : ADFS_FILETYPE_NONE; 19 } 20 21 #define ADFS_NDA_OWNER_READ (1 << 0) 22 #define ADFS_NDA_OWNER_WRITE (1 << 1) 23 #define ADFS_NDA_LOCKED (1 << 2) 24 #define ADFS_NDA_DIRECTORY (1 << 3) 25 #define ADFS_NDA_EXECUTE (1 << 4) 26 #define ADFS_NDA_PUBLIC_READ (1 << 5) 27 #define ADFS_NDA_PUBLIC_WRITE (1 << 6) 28 29 /* 30 * adfs file system inode data in memory 31 */ 32 struct adfs_inode_info { 33 loff_t mmu_private; 34 __u32 parent_id; /* parent indirect disc address */ 35 __u32 indaddr; /* object indirect disc address */ 36 __u32 loadaddr; /* RISC OS load address */ 37 __u32 execaddr; /* RISC OS exec address */ 38 unsigned int attr; /* RISC OS permissions */ 39 struct inode vfs_inode; 40 }; 41 42 static inline struct adfs_inode_info *ADFS_I(struct inode *inode) 43 { 44 return container_of(inode, struct adfs_inode_info, vfs_inode); 45 } 46 47 static inline bool adfs_inode_is_stamped(struct inode *inode) 48 { 49 return (ADFS_I(inode)->loadaddr & 0xfff00000) == 0xfff00000; 50 } 51 52 /* 53 * Forward-declare this 54 */ 55 struct adfs_discmap; 56 struct adfs_dir_ops; 57 58 /* 59 * ADFS file system superblock data in memory 60 */ 61 struct adfs_sb_info { 62 union { struct { 63 struct adfs_discmap *s_map; /* bh list containing map */ 64 const struct adfs_dir_ops *s_dir; /* directory operations */ 65 }; 66 struct rcu_head rcu; /* used only at shutdown time */ 67 }; 68 kuid_t s_uid; /* owner uid */ 69 kgid_t s_gid; /* owner gid */ 70 umode_t s_owner_mask; /* ADFS owner perm -> unix perm */ 71 umode_t s_other_mask; /* ADFS other perm -> unix perm */ 72 int s_ftsuffix; /* ,xyz hex filetype suffix option */ 73 74 __u32 s_ids_per_zone; /* max. no ids in one zone */ 75 __u32 s_idlen; /* length of ID in map */ 76 __u32 s_map_size; /* sector size of a map */ 77 signed int s_map2blk; /* shift left by this for map->sector*/ 78 unsigned int s_log2sharesize;/* log2 share size */ 79 unsigned int s_namelen; /* maximum number of characters in name */ 80 }; 81 82 static inline struct adfs_sb_info *ADFS_SB(struct super_block *sb) 83 { 84 return sb->s_fs_info; 85 } 86 87 /* 88 * Directory handling 89 */ 90 struct adfs_dir { 91 struct super_block *sb; 92 93 int nr_buffers; 94 struct buffer_head *bh[4]; 95 struct buffer_head **bhs; 96 97 unsigned int pos; 98 __u32 parent_id; 99 100 union { 101 struct adfs_dirheader *dirhead; 102 struct adfs_bigdirheader *bighead; 103 }; 104 union { 105 struct adfs_newdirtail *newtail; 106 struct adfs_bigdirtail *bigtail; 107 }; 108 }; 109 110 /* 111 * This is the overall maximum name length 112 */ 113 #define ADFS_MAX_NAME_LEN (256 + 4) /* +4 for ,xyz hex filetype suffix */ 114 struct object_info { 115 __u32 parent_id; /* parent object id */ 116 __u32 indaddr; /* indirect disc addr */ 117 __u32 loadaddr; /* load address */ 118 __u32 execaddr; /* execution address */ 119 __u32 size; /* size */ 120 __u8 attr; /* RISC OS attributes */ 121 unsigned int name_len; /* name length */ 122 char name[ADFS_MAX_NAME_LEN];/* file name */ 123 }; 124 125 struct adfs_dir_ops { 126 int (*read)(struct super_block *sb, unsigned int indaddr, 127 unsigned int size, struct adfs_dir *dir); 128 int (*iterate)(struct adfs_dir *dir, struct dir_context *ctx); 129 int (*setpos)(struct adfs_dir *dir, unsigned int fpos); 130 int (*getnext)(struct adfs_dir *dir, struct object_info *obj); 131 int (*update)(struct adfs_dir *dir, struct object_info *obj); 132 int (*create)(struct adfs_dir *dir, struct object_info *obj); 133 int (*remove)(struct adfs_dir *dir, struct object_info *obj); 134 int (*commit)(struct adfs_dir *dir); 135 }; 136 137 struct adfs_discmap { 138 struct buffer_head *dm_bh; 139 __u32 dm_startblk; 140 unsigned int dm_startbit; 141 unsigned int dm_endbit; 142 }; 143 144 /* Inode stuff */ 145 struct inode *adfs_iget(struct super_block *sb, struct object_info *obj); 146 int adfs_write_inode(struct inode *inode, struct writeback_control *wbc); 147 int adfs_notify_change(struct user_namespace *mnt_userns, struct dentry *dentry, 148 struct iattr *attr); 149 150 /* map.c */ 151 int adfs_map_lookup(struct super_block *sb, u32 frag_id, unsigned int offset); 152 void adfs_map_statfs(struct super_block *sb, struct kstatfs *buf); 153 struct adfs_discmap *adfs_read_map(struct super_block *sb, struct adfs_discrecord *dr); 154 void adfs_free_map(struct super_block *sb); 155 156 /* Misc */ 157 __printf(3, 4) 158 void __adfs_error(struct super_block *sb, const char *function, 159 const char *fmt, ...); 160 #define adfs_error(sb, fmt...) __adfs_error(sb, __func__, fmt) 161 void adfs_msg(struct super_block *sb, const char *pfx, const char *fmt, ...); 162 163 /* super.c */ 164 165 /* 166 * Inodes and file operations 167 */ 168 169 /* dir_*.c */ 170 extern const struct inode_operations adfs_dir_inode_operations; 171 extern const struct file_operations adfs_dir_operations; 172 extern const struct dentry_operations adfs_dentry_operations; 173 extern const struct adfs_dir_ops adfs_f_dir_ops; 174 extern const struct adfs_dir_ops adfs_fplus_dir_ops; 175 176 int adfs_dir_copyfrom(void *dst, struct adfs_dir *dir, unsigned int offset, 177 size_t len); 178 int adfs_dir_copyto(struct adfs_dir *dir, unsigned int offset, const void *src, 179 size_t len); 180 void adfs_dir_relse(struct adfs_dir *dir); 181 int adfs_dir_read_buffers(struct super_block *sb, u32 indaddr, 182 unsigned int size, struct adfs_dir *dir); 183 void adfs_object_fixup(struct adfs_dir *dir, struct object_info *obj); 184 extern int adfs_dir_update(struct super_block *sb, struct object_info *obj, 185 int wait); 186 187 /* file.c */ 188 extern const struct inode_operations adfs_file_inode_operations; 189 extern const struct file_operations adfs_file_operations; 190 191 static inline __u32 signed_asl(__u32 val, signed int shift) 192 { 193 if (shift >= 0) 194 val <<= shift; 195 else 196 val >>= -shift; 197 return val; 198 } 199 200 /* 201 * Calculate the address of a block in an object given the block offset 202 * and the object identity. 203 * 204 * The root directory ID should always be looked up in the map [3.4] 205 */ 206 static inline int __adfs_block_map(struct super_block *sb, u32 indaddr, 207 unsigned int block) 208 { 209 if (indaddr & 255) { 210 unsigned int off; 211 212 off = (indaddr & 255) - 1; 213 block += off << ADFS_SB(sb)->s_log2sharesize; 214 } 215 216 return adfs_map_lookup(sb, indaddr >> 8, block); 217 } 218 219 /* Return the disc record from the map */ 220 static inline 221 struct adfs_discrecord *adfs_map_discrecord(struct adfs_discmap *dm) 222 { 223 return (void *)(dm[0].dm_bh->b_data + 4); 224 } 225 226 static inline u64 adfs_disc_size(const struct adfs_discrecord *dr) 227 { 228 return (u64)le32_to_cpu(dr->disc_size_high) << 32 | 229 le32_to_cpu(dr->disc_size); 230 } 231