fs/affs/affs.h

   1 #include <linux/types.h>
   2 #include <linux/fs.h>
   3 #include <linux/buffer_head.h>
   4 #include <linux/amigaffs.h>
   5 #include <linux/mutex.h>
   6
   7 /* AmigaOS allows file names with up to 30 characters length.
   8  * Names longer than that will be silently truncated. If you
   9  * want to disallow this, comment out the following #define.
  10  * Creating filesystem objects with longer names will then
  11  * result in an error (ENAMETOOLONG).
  12  */
  13 /*#define AFFS_NO_TRUNCATE */
  14
  15 /* Ugly macros make the code more pretty. */
  16
  17 #define GET_END_PTR(st,p,sz)             ((st *)((char *)(p)+((sz)-sizeof(st))))
  18 #define AFFS_GET_HASHENTRY(data,hashkey) be32_to_cpu(((struct dir_front *)data)->hashtable[hashkey])
  19 #define AFFS_BLOCK(sb, bh, blk)         (AFFS_HEAD(bh)->table[AFFS_SB(sb)->s_hashsize-1-(blk)])
  20
  21 #ifdef __LITTLE_ENDIAN
  22 #define BO_EXBITS       0x18UL
  23 #elif defined(__BIG_ENDIAN)
  24 #define BO_EXBITS       0x00UL
  25 #else
  26 #error Endianness must be known for affs to work.
  27 #endif
  28
  29 #define AFFS_HEAD(bh)           ((struct affs_head *)(bh)->b_data)
  30 #define AFFS_TAIL(sb, bh)       ((struct affs_tail *)((bh)->b_data+(sb)->s_blocksize-sizeof(struct affs_tail)))
  31 #define AFFS_ROOT_HEAD(bh)      ((struct affs_root_head *)(bh)->b_data)
  32 #define AFFS_ROOT_TAIL(sb, bh)  ((struct affs_root_tail *)((bh)->b_data+(sb)->s_blocksize-sizeof(struct affs_root_tail)))
  33 #define AFFS_DATA_HEAD(bh)      ((struct affs_data_head *)(bh)->b_data)
  34 #define AFFS_DATA(bh)           (((struct affs_data_head *)(bh)->b_data)->data)
  35
  36 #define AFFS_CACHE_SIZE         PAGE_SIZE
  37
  38 #define AFFS_MAX_PREALLOC       32
  39 #define AFFS_LC_SIZE            (AFFS_CACHE_SIZE/sizeof(u32)/2)
  40 #define AFFS_AC_SIZE            (AFFS_CACHE_SIZE/sizeof(struct affs_ext_key)/2)
  41 #define AFFS_AC_MASK            (AFFS_AC_SIZE-1)
  42
  43 struct affs_ext_key {
  44         u32     ext;                            /* idx of the extended block */
  45         u32     key;                            /* block number */
  46 };
  47
  48 /*
  49  * affs fs inode data in memory
  50  */
  51 struct affs_inode_info {
  52         atomic_t i_opencnt;
  53         struct semaphore i_link_lock;           /* Protects internal inode access. */
  54         struct semaphore i_ext_lock;            /* Protects internal inode access. */
  55 #define i_hash_lock i_ext_lock
  56         u32      i_blkcnt;                      /* block count */
  57         u32      i_extcnt;                      /* extended block count */
  58         u32     *i_lc;                          /* linear cache of extended blocks */
  59         u32      i_lc_size;
  60         u32      i_lc_shift;
  61         u32      i_lc_mask;
  62         struct affs_ext_key *i_ac;              /* associative cache of extended blocks */
  63         u32      i_ext_last;                    /* last accessed extended block */
  64         struct buffer_head *i_ext_bh;           /* bh of last extended block */
  65         loff_t   mmu_private;
  66         u32      i_protect;                     /* unused attribute bits */
  67         u32      i_lastalloc;                   /* last allocated block */
  68         int      i_pa_cnt;                      /* number of preallocated blocks */
  69         struct inode vfs_inode;
  70 };
  71
  72 /* short cut to get to the affs specific inode data */
  73 static inline struct affs_inode_info *AFFS_I(struct inode *inode)
  74 {
  75         return list_entry(inode, struct affs_inode_info, vfs_inode);
  76 }
  77
  78 /*
  79  * super-block data in memory
  80  *
  81  * Block numbers are adjusted for their actual size
  82  *
  83  */
  84
  85 struct affs_bm_info {
  86         u32 bm_key;                     /* Disk block number */
  87         u32 bm_free;                    /* Free blocks in here */
  88 };
  89
  90 struct affs_sb_info {
  91         int s_partition_size;           /* Partition size in blocks. */
  92         int s_reserved;                 /* Number of reserved blocks. */
  93         //u32 s_blksize;                        /* Initial device blksize */
  94         u32 s_data_blksize;             /* size of the data block w/o header */
  95         u32 s_root_block;               /* FFS root block number. */
  96         int s_hashsize;                 /* Size of hash table. */
  97         unsigned long s_flags;          /* See below. */
  98         uid_t s_uid;                    /* uid to override */
  99         gid_t s_gid;                    /* gid to override */
 100         umode_t s_mode;                 /* mode to override */
 101         struct buffer_head *s_root_bh;  /* Cached root block. */
 102         struct mutex s_bmlock;          /* Protects bitmap access. */
 103         struct affs_bm_info *s_bitmap;  /* Bitmap infos. */
 104         u32 s_bmap_count;               /* # of bitmap blocks. */
 105         u32 s_bmap_bits;                /* # of bits in one bitmap blocks */
 106         u32 s_last_bmap;
 107         struct buffer_head *s_bmap_bh;
 108         char *s_prefix;                 /* Prefix for volumes and assigns. */
 109         int s_prefix_len;               /* Length of prefix. */
 110         char s_volume[32];              /* Volume prefix for absolute symlinks. */
 111 };
 112
 113 #define SF_INTL         0x0001          /* International filesystem. */
 114 #define SF_BM_VALID     0x0002          /* Bitmap is valid. */
 115 #define SF_IMMUTABLE    0x0004          /* Protection bits cannot be changed */
 116 #define SF_QUIET        0x0008          /* chmod errors will be not reported */
 117 #define SF_SETUID       0x0010          /* Ignore Amiga uid */
 118 #define SF_SETGID       0x0020          /* Ignore Amiga gid */
 119 #define SF_SETMODE      0x0040          /* Ignore Amiga protection bits */
 120 #define SF_MUFS         0x0100          /* Use MUFS uid/gid mapping */
 121 #define SF_OFS          0x0200          /* Old filesystem */
 122 #define SF_PREFIX       0x0400          /* Buffer for prefix is allocated */
 123 #define SF_VERBOSE      0x0800          /* Talk about fs when mounting */
 124
 125 /* short cut to get to the affs specific sb data */
 126 static inline struct affs_sb_info *AFFS_SB(struct super_block *sb)
 127 {
 128         return sb->s_fs_info;
 129 }
 130
 131 /* amigaffs.c */
 132
 133 extern int      affs_insert_hash(struct inode *inode, struct buffer_head *bh);
 134 extern int      affs_remove_hash(struct inode *dir, struct buffer_head *rem_bh);
 135 extern int      affs_remove_header(struct dentry *dentry);
 136 extern u32      affs_checksum_block(struct super_block *sb, struct buffer_head *bh);
 137 extern void     affs_fix_checksum(struct super_block *sb, struct buffer_head *bh);
 138 extern void     secs_to_datestamp(time_t secs, struct affs_date *ds);
 139 extern mode_t   prot_to_mode(u32 prot);
 140 extern void     mode_to_prot(struct inode *inode);
 141 extern void     affs_error(struct super_block *sb, const char *function, const char *fmt, ...);
 142 extern void     affs_warning(struct super_block *sb, const char *function, const char *fmt, ...);
 143 extern int      affs_check_name(const unsigned char *name, int len);
 144 extern int      affs_copy_name(unsigned char *bstr, struct dentry *dentry);
 145
 146 /* bitmap. c */
 147
 148 extern u32      affs_count_free_blocks(struct super_block *s);
 149 extern void     affs_free_block(struct super_block *sb, u32 block);
 150 extern u32      affs_alloc_block(struct inode *inode, u32 goal);
 151 extern int      affs_init_bitmap(struct super_block *sb, int *flags);
 152 extern void     affs_free_bitmap(struct super_block *sb);
 153
 154 /* namei.c */
 155
 156 extern int      affs_hash_name(struct super_block *sb, const u8 *name, unsigned int len);
 157 extern struct dentry *affs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *);
 158 extern int      affs_unlink(struct inode *dir, struct dentry *dentry);
 159 extern int      affs_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *);
 160 extern int      affs_mkdir(struct inode *dir, struct dentry *dentry, int mode);
 161 extern int      affs_rmdir(struct inode *dir, struct dentry *dentry);
 162 extern int      affs_link(struct dentry *olddentry, struct inode *dir,
 163                           struct dentry *dentry);
 164 extern int      affs_symlink(struct inode *dir, struct dentry *dentry,
 165                              const char *symname);
 166 extern int      affs_rename(struct inode *old_dir, struct dentry *old_dentry,
 167                             struct inode *new_dir, struct dentry *new_dentry);
 168
 169 /* inode.c */
 170
 171 extern unsigned long             affs_parent_ino(struct inode *dir);
 172 extern struct inode             *affs_new_inode(struct inode *dir);
 173 extern int                       affs_notify_change(struct dentry *dentry, struct iattr *attr);
 174 extern void                      affs_delete_inode(struct inode *inode);
 175 extern void                      affs_clear_inode(struct inode *inode);
 176 extern struct inode             *affs_iget(struct super_block *sb,
 177                                         unsigned long ino);
 178 extern int                       affs_write_inode(struct inode *inode, int);
 179 extern int                       affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s32 type);
 180
 181 /* file.c */
 182
 183 void            affs_free_prealloc(struct inode *inode);
 184 extern void     affs_truncate(struct inode *);
 185
 186 /* dir.c */
 187
 188 extern void   affs_dir_truncate(struct inode *);
 189
 190 /* jump tables */
 191
 192 extern const struct inode_operations     affs_file_inode_operations;
 193 extern const struct inode_operations     affs_dir_inode_operations;
 194 extern const struct inode_operations   affs_symlink_inode_operations;
 195 extern const struct file_operations      affs_file_operations;
 196 extern const struct file_operations      affs_file_operations_ofs;
 197 extern const struct file_operations      affs_dir_operations;
 198 extern const struct address_space_operations     affs_symlink_aops;
 199 extern const struct address_space_operations     affs_aops;
 200 extern const struct address_space_operations     affs_aops_ofs;
 201
 202 extern const struct dentry_operations    affs_dentry_operations;
 203
 204 static inline void
 205 affs_set_blocksize(struct super_block *sb, int size)
 206 {
 207         sb_set_blocksize(sb, size);
 208 }
 209 static inline struct buffer_head *
 210 affs_bread(struct super_block *sb, int block)
 211 {
 212         pr_debug("affs_bread: %d\n", block);
 213         if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size)
 214                 return sb_bread(sb, block);
 215         return NULL;
 216 }
 217 static inline struct buffer_head *
 218 affs_getblk(struct super_block *sb, int block)
 219 {
 220         pr_debug("affs_getblk: %d\n", block);
 221         if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size)
 222                 return sb_getblk(sb, block);
 223         return NULL;
 224 }
 225 static inline struct buffer_head *
 226 affs_getzeroblk(struct super_block *sb, int block)
 227 {
 228         struct buffer_head *bh;
 229         pr_debug("affs_getzeroblk: %d\n", block);
 230         if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size) {
 231                 bh = sb_getblk(sb, block);
 232                 lock_buffer(bh);
 233                 memset(bh->b_data, 0 , sb->s_blocksize);
 234                 set_buffer_uptodate(bh);
 235                 unlock_buffer(bh);
 236                 return bh;
 237         }
 238         return NULL;
 239 }
 240 static inline struct buffer_head *
 241 affs_getemptyblk(struct super_block *sb, int block)
 242 {
 243         struct buffer_head *bh;
 244         pr_debug("affs_getemptyblk: %d\n", block);
 245         if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size) {
 246                 bh = sb_getblk(sb, block);
 247                 wait_on_buffer(bh);
 248                 set_buffer_uptodate(bh);
 249                 return bh;
 250         }
 251         return NULL;
 252 }
 253 static inline void
 254 affs_brelse(struct buffer_head *bh)
 255 {
 256         if (bh)
 257                 pr_debug("affs_brelse: %lld\n", (long long) bh->b_blocknr);
 258         brelse(bh);
 259 }
 260
 261 static inline void
 262 affs_adjust_checksum(struct buffer_head *bh, u32 val)
 263 {
 264         u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[5]);
 265         ((__be32 *)bh->b_data)[5] = cpu_to_be32(tmp - val);
 266 }
 267 static inline void
 268 affs_adjust_bitmapchecksum(struct buffer_head *bh, u32 val)
 269 {
 270         u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[0]);
 271         ((__be32 *)bh->b_data)[0] = cpu_to_be32(tmp - val);
 272 }
 273
 274 static inline void
 275 affs_lock_link(struct inode *inode)
 276 {
 277         down(&AFFS_I(inode)->i_link_lock);
 278 }
 279 static inline void
 280 affs_unlock_link(struct inode *inode)
 281 {
 282         up(&AFFS_I(inode)->i_link_lock);
 283 }
 284 static inline void
 285 affs_lock_dir(struct inode *inode)
 286 {
 287         down(&AFFS_I(inode)->i_hash_lock);
 288 }
 289 static inline void
 290 affs_unlock_dir(struct inode *inode)
 291 {
 292         up(&AFFS_I(inode)->i_hash_lock);
 293 }
 294 static inline void
 295 affs_lock_ext(struct inode *inode)
 296 {
 297         down(&AFFS_I(inode)->i_ext_lock);
 298 }
 299 static inline void
 300 affs_unlock_ext(struct inode *inode)
 301 {
 302         up(&AFFS_I(inode)->i_ext_lock);
 303 }