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 #include <linux/workqueue.h>
   7
   8 /* Ugly macros make the code more pretty. */
   9
  10 #define GET_END_PTR(st,p,sz)             ((st *)((char *)(p)+((sz)-sizeof(st))))
  11 #define AFFS_GET_HASHENTRY(data,hashkey) be32_to_cpu(((struct dir_front *)data)->hashtable[hashkey])
  12 #define AFFS_BLOCK(sb, bh, blk)         (AFFS_HEAD(bh)->table[AFFS_SB(sb)->s_hashsize-1-(blk)])
  13
  14 #define AFFS_HEAD(bh)           ((struct affs_head *)(bh)->b_data)
  15 #define AFFS_TAIL(sb, bh)       ((struct affs_tail *)((bh)->b_data+(sb)->s_blocksize-sizeof(struct affs_tail)))
  16 #define AFFS_ROOT_HEAD(bh)      ((struct affs_root_head *)(bh)->b_data)
  17 #define AFFS_ROOT_TAIL(sb, bh)  ((struct affs_root_tail *)((bh)->b_data+(sb)->s_blocksize-sizeof(struct affs_root_tail)))
  18 #define AFFS_DATA_HEAD(bh)      ((struct affs_data_head *)(bh)->b_data)
  19 #define AFFS_DATA(bh)           (((struct affs_data_head *)(bh)->b_data)->data)
  20
  21 #define AFFS_CACHE_SIZE         PAGE_SIZE
  22
  23 #define AFFS_LC_SIZE            (AFFS_CACHE_SIZE/sizeof(u32)/2)
  24 #define AFFS_AC_SIZE            (AFFS_CACHE_SIZE/sizeof(struct affs_ext_key)/2)
  25 #define AFFS_AC_MASK            (AFFS_AC_SIZE-1)
  26
  27 struct affs_ext_key {
  28         u32     ext;                            /* idx of the extended block */
  29         u32     key;                            /* block number */
  30 };
  31
  32 /*
  33  * affs fs inode data in memory
  34  */
  35 struct affs_inode_info {
  36         atomic_t i_opencnt;
  37         struct semaphore i_link_lock;           /* Protects internal inode access. */
  38         struct semaphore i_ext_lock;            /* Protects internal inode access. */
  39 #define i_hash_lock i_ext_lock
  40         u32      i_blkcnt;                      /* block count */
  41         u32      i_extcnt;                      /* extended block count */
  42         u32     *i_lc;                          /* linear cache of extended blocks */
  43         u32      i_lc_size;
  44         u32      i_lc_shift;
  45         u32      i_lc_mask;
  46         struct affs_ext_key *i_ac;              /* associative cache of extended blocks */
  47         u32      i_ext_last;                    /* last accessed extended block */
  48         struct buffer_head *i_ext_bh;           /* bh of last extended block */
  49         loff_t   mmu_private;
  50         u32      i_protect;                     /* unused attribute bits */
  51         u32      i_lastalloc;                   /* last allocated block */
  52         int      i_pa_cnt;                      /* number of preallocated blocks */
  53         struct inode vfs_inode;
  54 };
  55
  56 /* short cut to get to the affs specific inode data */
  57 static inline struct affs_inode_info *AFFS_I(struct inode *inode)
  58 {
  59         return list_entry(inode, struct affs_inode_info, vfs_inode);
  60 }
  61
  62 /*
  63  * super-block data in memory
  64  *
  65  * Block numbers are adjusted for their actual size
  66  *
  67  */
  68
  69 struct affs_bm_info {
  70         u32 bm_key;                     /* Disk block number */
  71         u32 bm_free;                    /* Free blocks in here */
  72 };
  73
  74 struct affs_sb_info {
  75         int s_partition_size;           /* Partition size in blocks. */
  76         int s_reserved;                 /* Number of reserved blocks. */
  77         //u32 s_blksize;                        /* Initial device blksize */
  78         u32 s_data_blksize;             /* size of the data block w/o header */
  79         u32 s_root_block;               /* FFS root block number. */
  80         int s_hashsize;                 /* Size of hash table. */
  81         unsigned long s_flags;          /* See below. */
  82         kuid_t s_uid;                   /* uid to override */
  83         kgid_t s_gid;                   /* gid to override */
  84         umode_t s_mode;                 /* mode to override */
  85         struct buffer_head *s_root_bh;  /* Cached root block. */
  86         struct mutex s_bmlock;          /* Protects bitmap access. */
  87         struct affs_bm_info *s_bitmap;  /* Bitmap infos. */
  88         u32 s_bmap_count;               /* # of bitmap blocks. */
  89         u32 s_bmap_bits;                /* # of bits in one bitmap blocks */
  90         u32 s_last_bmap;
  91         struct buffer_head *s_bmap_bh;
  92         char *s_prefix;                 /* Prefix for volumes and assigns. */
  93         char s_volume[32];              /* Volume prefix for absolute symlinks. */
  94         spinlock_t symlink_lock;        /* protects the previous two */
  95         struct super_block *sb;         /* the VFS superblock object */
  96         int work_queued;                /* non-zero delayed work is queued */
  97         struct delayed_work sb_work;    /* superblock flush delayed work */
  98         spinlock_t work_lock;           /* protects sb_work and work_queued */
  99 };
 100
 101 #define SF_INTL         0x0001          /* International filesystem. */
 102 #define SF_BM_VALID     0x0002          /* Bitmap is valid. */
 103 #define SF_IMMUTABLE    0x0004          /* Protection bits cannot be changed */
 104 #define SF_QUIET        0x0008          /* chmod errors will be not reported */
 105 #define SF_SETUID       0x0010          /* Ignore Amiga uid */
 106 #define SF_SETGID       0x0020          /* Ignore Amiga gid */
 107 #define SF_SETMODE      0x0040          /* Ignore Amiga protection bits */
 108 #define SF_MUFS         0x0100          /* Use MUFS uid/gid mapping */
 109 #define SF_OFS          0x0200          /* Old filesystem */
 110 #define SF_PREFIX       0x0400          /* Buffer for prefix is allocated */
 111 #define SF_VERBOSE      0x0800          /* Talk about fs when mounting */
 112 #define SF_NO_TRUNCATE  0x1000          /* Don't truncate filenames */
 113
 114 /* short cut to get to the affs specific sb data */
 115 static inline struct affs_sb_info *AFFS_SB(struct super_block *sb)
 116 {
 117         return sb->s_fs_info;
 118 }
 119
 120 void affs_mark_sb_dirty(struct super_block *sb);
 121
 122 /* amigaffs.c */
 123
 124 extern int      affs_insert_hash(struct inode *inode, struct buffer_head *bh);
 125 extern int      affs_remove_hash(struct inode *dir, struct buffer_head *rem_bh);
 126 extern int      affs_remove_header(struct dentry *dentry);
 127 extern u32      affs_checksum_block(struct super_block *sb, struct buffer_head *bh);
 128 extern void     affs_fix_checksum(struct super_block *sb, struct buffer_head *bh);
 129 extern void     secs_to_datestamp(time_t secs, struct affs_date *ds);
 130 extern umode_t  prot_to_mode(u32 prot);
 131 extern void     mode_to_prot(struct inode *inode);
 132 extern void     affs_error(struct super_block *sb, const char *function,
 133                            const char *fmt, ...);
 134 extern void     affs_warning(struct super_block *sb, const char *function,
 135                              const char *fmt, ...);
 136 extern bool     affs_nofilenametruncate(const struct dentry *dentry);
 137 extern int      affs_check_name(const unsigned char *name, int len,
 138                                 bool notruncate);
 139 extern int      affs_copy_name(unsigned char *bstr, struct dentry *dentry);
 140
 141 /* bitmap. c */
 142
 143 extern u32      affs_count_free_blocks(struct super_block *s);
 144 extern void     affs_free_block(struct super_block *sb, u32 block);
 145 extern u32      affs_alloc_block(struct inode *inode, u32 goal);
 146 extern int      affs_init_bitmap(struct super_block *sb, int *flags);
 147 extern void     affs_free_bitmap(struct super_block *sb);
 148
 149 /* namei.c */
 150
 151 extern int      affs_hash_name(struct super_block *sb, const u8 *name, unsigned int len);
 152 extern struct dentry *affs_lookup(struct inode *dir, struct dentry *dentry, unsigned int);
 153 extern int      affs_unlink(struct inode *dir, struct dentry *dentry);
 154 extern int      affs_create(struct inode *dir, struct dentry *dentry, umode_t mode, bool);
 155 extern int      affs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode);
 156 extern int      affs_rmdir(struct inode *dir, struct dentry *dentry);
 157 extern int      affs_link(struct dentry *olddentry, struct inode *dir,
 158                           struct dentry *dentry);
 159 extern int      affs_symlink(struct inode *dir, struct dentry *dentry,
 160                              const char *symname);
 161 extern int      affs_rename(struct inode *old_dir, struct dentry *old_dentry,
 162                             struct inode *new_dir, struct dentry *new_dentry);
 163
 164 /* inode.c */
 165
 166 extern unsigned long             affs_parent_ino(struct inode *dir);
 167 extern struct inode             *affs_new_inode(struct inode *dir);
 168 extern int                       affs_notify_change(struct dentry *dentry, struct iattr *attr);
 169 extern void                      affs_evict_inode(struct inode *inode);
 170 extern struct inode             *affs_iget(struct super_block *sb,
 171                                         unsigned long ino);
 172 extern int                       affs_write_inode(struct inode *inode,
 173                                         struct writeback_control *wbc);
 174 extern int                       affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s32 type);
 175
 176 /* file.c */
 177
 178 void            affs_free_prealloc(struct inode *inode);
 179 extern void     affs_truncate(struct inode *);
 180 int             affs_file_fsync(struct file *, loff_t, loff_t, int);
 181
 182 /* dir.c */
 183
 184 extern void   affs_dir_truncate(struct inode *);
 185
 186 /* jump tables */
 187
 188 extern const struct inode_operations     affs_file_inode_operations;
 189 extern const struct inode_operations     affs_dir_inode_operations;
 190 extern const struct inode_operations   affs_symlink_inode_operations;
 191 extern const struct file_operations      affs_file_operations;
 192 extern const struct file_operations      affs_file_operations_ofs;
 193 extern const struct file_operations      affs_dir_operations;
 194 extern const struct address_space_operations     affs_symlink_aops;
 195 extern const struct address_space_operations     affs_aops;
 196 extern const struct address_space_operations     affs_aops_ofs;
 197
 198 extern const struct dentry_operations    affs_dentry_operations;
 199 extern const struct dentry_operations    affs_intl_dentry_operations;
 200
 201 static inline void
 202 affs_set_blocksize(struct super_block *sb, int size)
 203 {
 204         sb_set_blocksize(sb, size);
 205 }
 206 static inline struct buffer_head *
 207 affs_bread(struct super_block *sb, int block)
 208 {
 209         pr_debug("affs_bread: %d\n", block);
 210         if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size)
 211                 return sb_bread(sb, block);
 212         return NULL;
 213 }
 214 static inline struct buffer_head *
 215 affs_getblk(struct super_block *sb, int block)
 216 {
 217         pr_debug("affs_getblk: %d\n", block);
 218         if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size)
 219                 return sb_getblk(sb, block);
 220         return NULL;
 221 }
 222 static inline struct buffer_head *
 223 affs_getzeroblk(struct super_block *sb, int block)
 224 {
 225         struct buffer_head *bh;
 226         pr_debug("affs_getzeroblk: %d\n", block);
 227         if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size) {
 228                 bh = sb_getblk(sb, block);
 229                 lock_buffer(bh);
 230                 memset(bh->b_data, 0 , sb->s_blocksize);
 231                 set_buffer_uptodate(bh);
 232                 unlock_buffer(bh);
 233                 return bh;
 234         }
 235         return NULL;
 236 }
 237 static inline struct buffer_head *
 238 affs_getemptyblk(struct super_block *sb, int block)
 239 {
 240         struct buffer_head *bh;
 241         pr_debug("affs_getemptyblk: %d\n", block);
 242         if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size) {
 243                 bh = sb_getblk(sb, block);
 244                 wait_on_buffer(bh);
 245                 set_buffer_uptodate(bh);
 246                 return bh;
 247         }
 248         return NULL;
 249 }
 250 static inline void
 251 affs_brelse(struct buffer_head *bh)
 252 {
 253         if (bh)
 254                 pr_debug("affs_brelse: %lld\n", (long long) bh->b_blocknr);
 255         brelse(bh);
 256 }
 257
 258 static inline void
 259 affs_adjust_checksum(struct buffer_head *bh, u32 val)
 260 {
 261         u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[5]);
 262         ((__be32 *)bh->b_data)[5] = cpu_to_be32(tmp - val);
 263 }
 264 static inline void
 265 affs_adjust_bitmapchecksum(struct buffer_head *bh, u32 val)
 266 {
 267         u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[0]);
 268         ((__be32 *)bh->b_data)[0] = cpu_to_be32(tmp - val);
 269 }
 270
 271 static inline void
 272 affs_lock_link(struct inode *inode)
 273 {
 274         down(&AFFS_I(inode)->i_link_lock);
 275 }
 276 static inline void
 277 affs_unlock_link(struct inode *inode)
 278 {
 279         up(&AFFS_I(inode)->i_link_lock);
 280 }
 281 static inline void
 282 affs_lock_dir(struct inode *inode)
 283 {
 284         down(&AFFS_I(inode)->i_hash_lock);
 285 }
 286 static inline void
 287 affs_unlock_dir(struct inode *inode)
 288 {
 289         up(&AFFS_I(inode)->i_hash_lock);
 290 }
 291 static inline void
 292 affs_lock_ext(struct inode *inode)
 293 {
 294         down(&AFFS_I(inode)->i_ext_lock);
 295 }
 296 static inline void
 297 affs_unlock_ext(struct inode *inode)
 298 {
 299         up(&AFFS_I(inode)->i_ext_lock);
 300 }