root/fs/adfs/adfs.h

INCLUDED FROM

DEFINITIONS

1. adfs_filetype
2. ADFS_I
3. adfs_inode_is_stamped
4. ADFS_SB
5. signed_asl
6. __adfs_block_map
7. adfs_map_discrecord
8. adfs_disc_size

   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 #include "dir_f.h"
  30 
  31 /*
  32  * adfs file system inode data in memory
  33  */
  34 struct adfs_inode_info {
  35         loff_t          mmu_private;
  36         __u32           parent_id;      /* parent indirect disc address */
  37         __u32           loadaddr;       /* RISC OS load address         */
  38         __u32           execaddr;       /* RISC OS exec address         */
  39         unsigned int    attr;           /* RISC OS permissions          */
  40         struct inode vfs_inode;
  41 };
  42 
  43 static inline struct adfs_inode_info *ADFS_I(struct inode *inode)
  44 {
  45         return container_of(inode, struct adfs_inode_info, vfs_inode);
  46 }
  47 
  48 static inline bool adfs_inode_is_stamped(struct inode *inode)
  49 {
  50         return (ADFS_I(inode)->loadaddr & 0xfff00000) == 0xfff00000;
  51 }
  52 
  53 /*
  54  * Forward-declare this
  55  */
  56 struct adfs_discmap;
  57 struct adfs_dir_ops;
  58 
  59 /*
  60  * ADFS file system superblock data in memory
  61  */
  62 struct adfs_sb_info {
  63         union { struct {
  64                 struct adfs_discmap *s_map;     /* bh list containing map */
  65                 const struct adfs_dir_ops *s_dir; /* directory operations */
  66                 };
  67                 struct rcu_head rcu;    /* used only at shutdown time    */
  68         };
  69         kuid_t          s_uid;          /* owner uid */
  70         kgid_t          s_gid;          /* owner gid */
  71         umode_t         s_owner_mask;   /* ADFS owner perm -> unix perm */
  72         umode_t         s_other_mask;   /* ADFS other perm -> unix perm */
  73         int             s_ftsuffix;     /* ,xyz hex filetype suffix option */
  74 
  75         __u32           s_ids_per_zone; /* max. no ids in one zone */
  76         __u32           s_idlen;        /* length of ID in map */
  77         __u32           s_map_size;     /* sector size of a map */
  78         signed int      s_map2blk;      /* shift left by this for map->sector*/
  79         unsigned int    s_log2sharesize;/* log2 share size */
  80         unsigned int    s_namelen;      /* maximum number of characters in name  */
  81 };
  82 
  83 static inline struct adfs_sb_info *ADFS_SB(struct super_block *sb)
  84 {
  85         return sb->s_fs_info;
  86 }
  87 
  88 /*
  89  * Directory handling
  90  */
  91 struct adfs_dir {
  92         struct super_block      *sb;
  93 
  94         int                     nr_buffers;
  95         struct buffer_head      *bh[4];
  96 
  97         /* big directories need allocated buffers */
  98         struct buffer_head      **bh_fplus;
  99 
 100         unsigned int            pos;
 101         __u32                   parent_id;
 102 
 103         struct adfs_dirheader   dirhead;
 104         union  adfs_dirtail     dirtail;
 105 };
 106 
 107 /*
 108  * This is the overall maximum name length
 109  */
 110 #define ADFS_MAX_NAME_LEN       (256 + 4) /* +4 for ,xyz hex filetype suffix */
 111 struct object_info {
 112         __u32           parent_id;              /* parent object id     */
 113         __u32           indaddr;                /* indirect disc addr   */
 114         __u32           loadaddr;               /* load address         */
 115         __u32           execaddr;               /* execution address    */
 116         __u32           size;                   /* size                 */
 117         __u8            attr;                   /* RISC OS attributes   */
 118         unsigned int    name_len;               /* name length          */
 119         char            name[ADFS_MAX_NAME_LEN];/* file name            */
 120 };
 121 
 122 struct adfs_dir_ops {
 123         int     (*read)(struct super_block *sb, unsigned int indaddr,
 124                         unsigned int size, struct adfs_dir *dir);
 125         int     (*setpos)(struct adfs_dir *dir, unsigned int fpos);
 126         int     (*getnext)(struct adfs_dir *dir, struct object_info *obj);
 127         int     (*update)(struct adfs_dir *dir, struct object_info *obj);
 128         int     (*create)(struct adfs_dir *dir, struct object_info *obj);
 129         int     (*remove)(struct adfs_dir *dir, struct object_info *obj);
 130         int     (*sync)(struct adfs_dir *dir);
 131         void    (*free)(struct adfs_dir *dir);
 132 };
 133 
 134 struct adfs_discmap {
 135         struct buffer_head      *dm_bh;
 136         __u32                   dm_startblk;
 137         unsigned int            dm_startbit;
 138         unsigned int            dm_endbit;
 139 };
 140 
 141 /* Inode stuff */
 142 struct inode *adfs_iget(struct super_block *sb, struct object_info *obj);
 143 int adfs_write_inode(struct inode *inode, struct writeback_control *wbc);
 144 int adfs_notify_change(struct dentry *dentry, struct iattr *attr);
 145 
 146 /* map.c */
 147 int adfs_map_lookup(struct super_block *sb, u32 frag_id, unsigned int offset);
 148 extern unsigned int adfs_map_free(struct super_block *sb);
 149 
 150 /* Misc */
 151 __printf(3, 4)
 152 void __adfs_error(struct super_block *sb, const char *function,
 153                   const char *fmt, ...);
 154 #define adfs_error(sb, fmt...) __adfs_error(sb, __func__, fmt)
 155 void adfs_msg(struct super_block *sb, const char *pfx, const char *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 const struct adfs_dir_ops adfs_f_dir_ops;
 168 extern const struct adfs_dir_ops adfs_fplus_dir_ops;
 169 
 170 void adfs_object_fixup(struct adfs_dir *dir, struct object_info *obj);
 171 extern int adfs_dir_update(struct super_block *sb, struct object_info *obj,
 172                            int wait);
 173 
 174 /* file.c */
 175 extern const struct inode_operations adfs_file_inode_operations;
 176 extern const struct file_operations adfs_file_operations;
 177 
 178 static inline __u32 signed_asl(__u32 val, signed int shift)
 179 {
 180         if (shift >= 0)
 181                 val <<= shift;
 182         else
 183                 val >>= -shift;
 184         return val;
 185 }
 186 
 187 /*
 188  * Calculate the address of a block in an object given the block offset
 189  * and the object identity.
 190  *
 191  * The root directory ID should always be looked up in the map [3.4]
 192  */
 193 static inline int __adfs_block_map(struct super_block *sb, u32 indaddr,
 194                                    unsigned int block)
 195 {
 196         if (indaddr & 255) {
 197                 unsigned int off;
 198 
 199                 off = (indaddr & 255) - 1;
 200                 block += off << ADFS_SB(sb)->s_log2sharesize;
 201         }
 202 
 203         return adfs_map_lookup(sb, indaddr >> 8, block);
 204 }
 205 
 206 /* Return the disc record from the map */
 207 static inline
 208 struct adfs_discrecord *adfs_map_discrecord(struct adfs_discmap *dm)
 209 {
 210         return (void *)(dm[0].dm_bh->b_data + 4);
 211 }
 212 
 213 static inline u64 adfs_disc_size(const struct adfs_discrecord *dr)
 214 {
 215         return (u64)le32_to_cpu(dr->disc_size_high) << 32 |
 216                     le32_to_cpu(dr->disc_size);
 217 }