fs/affs/affs.h

   1 #ifdef pr_fmt
   2 #undef pr_fmt
   3 #endif
   4
   5 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   6
   7 #include <linux/types.h>
   8 #include <linux/fs.h>
   9 #include <linux/buffer_head.h>
  10 #include <linux/amigaffs.h>
  11 #include <linux/mutex.h>
  12 #include <linux/workqueue.h>
  13
  14 /* Ugly macros make the code more pretty. */
  15
  16 #define GET_END_PTR(st,p,sz)             ((st *)((char *)(p)+((sz)-sizeof(st))))
  17 #define AFFS_GET_HASHENTRY(data,hashkey) be32_to_cpu(((struct dir_front *)data)->hashtable[hashkey])
  18 #define AFFS_BLOCK(sb, bh, blk)         (AFFS_HEAD(bh)->table[AFFS_SB(sb)->s_hashsize-1-(blk)])
  19
  20 #define AFFS_HEAD(bh)           ((struct affs_head *)(bh)->b_data)
  21 #define AFFS_TAIL(sb, bh)       ((struct affs_tail *)((bh)->b_data+(sb)->s_blocksize-sizeof(struct affs_tail)))
  22 #define AFFS_ROOT_HEAD(bh)      ((struct affs_root_head *)(bh)->b_data)
  23 #define AFFS_ROOT_TAIL(sb, bh)  ((struct affs_root_tail *)((bh)->b_data+(sb)->s_blocksize-sizeof(struct affs_root_tail)))
  24 #define AFFS_DATA_HEAD(bh)      ((struct affs_data_head *)(bh)->b_data)
  25 #define AFFS_DATA(bh)           (((struct affs_data_head *)(bh)->b_data)->data)
  26
  27 #define AFFS_CACHE_SIZE         PAGE_SIZE
  28
  29 #define AFFS_LC_SIZE            (AFFS_CACHE_SIZE/sizeof(u32)/2)
  30 #define AFFS_AC_SIZE            (AFFS_CACHE_SIZE/sizeof(struct affs_ext_key)/2)
  31 #define AFFS_AC_MASK            (AFFS_AC_SIZE-1)
  32
  33 struct affs_ext_key {
  34         u32     ext;                            /* idx of the extended block */
  35         u32     key;                            /* block number */
  36 };
  37
  38 /*
  39  * affs fs inode data in memory
  40  */
  41 struct affs_inode_info {
  42         atomic_t i_opencnt;
  43         struct semaphore i_link_lock;           /* Protects internal inode access. */
  44         struct semaphore i_ext_lock;            /* Protects internal inode access. */
  45 #define i_hash_lock i_ext_lock
  46         u32      i_blkcnt;                      /* block count */
  47         u32      i_extcnt;                      /* extended block count */
  48         u32     *i_lc;                          /* linear cache of extended blocks */
  49         u32      i_lc_size;
  50         u32      i_lc_shift;
  51         u32      i_lc_mask;
  52         struct affs_ext_key *i_ac;              /* associative cache of extended blocks */
  53         u32      i_ext_last;                    /* last accessed extended block */
  54         struct buffer_head *i_ext_bh;           /* bh of last extended block */
  55         loff_t   mmu_private;
  56         u32      i_protect;                     /* unused attribute bits */
  57         u32      i_lastalloc;                   /* last allocated block */
  58         int      i_pa_cnt;                      /* number of preallocated blocks */
  59         struct inode vfs_inode;
  60 };
  61
  62 /* short cut to get to the affs specific inode data */
  63 static inline struct affs_inode_info *AFFS_I(struct inode *inode)
  64 {
  65         return list_entry(inode, struct affs_inode_info, vfs_inode);
  66 }
  67
  68 /*
  69  * super-block data in memory
  70  *
  71  * Block numbers are adjusted for their actual size
  72  *
  73  */
  74
  75 struct affs_bm_info {
  76         u32 bm_key;                     /* Disk block number */
  77         u32 bm_free;                    /* Free blocks in here */
  78 };
  79
  80 struct affs_sb_info {
  81         int s_partition_size;           /* Partition size in blocks. */
  82         int s_reserved;                 /* Number of reserved blocks. */
  83         //u32 s_blksize;                        /* Initial device blksize */
  84         u32 s_data_blksize;             /* size of the data block w/o header */
  85         u32 s_root_block;               /* FFS root block number. */
  86         int s_hashsize;                 /* Size of hash table. */
  87         unsigned long s_flags;          /* See below. */
  88         kuid_t s_uid;                   /* uid to override */
  89         kgid_t s_gid;                   /* gid to override */
  90         umode_t s_mode;                 /* mode to override */
  91         struct buffer_head *s_root_bh;  /* Cached root block. */
  92         struct mutex s_bmlock;          /* Protects bitmap access. */
  93         struct affs_bm_info *s_bitmap;  /* Bitmap infos. */
  94         u32 s_bmap_count;               /* # of bitmap blocks. */
  95         u32 s_bmap_bits;                /* # of bits in one bitmap blocks */
  96         u32 s_last_bmap;
  97         struct buffer_head *s_bmap_bh;
  98         char *s_prefix;                 /* Prefix for volumes and assigns. */
  99         char s_volume[32];              /* Volume prefix for absolute symlinks. */
 100         spinlock_t symlink_lock;        /* protects the previous two */
 101         struct super_block *sb;         /* the VFS superblock object */
 102         int work_queued;                /* non-zero delayed work is queued */
 103         struct delayed_work sb_work;    /* superblock flush delayed work */
 104         spinlock_t work_lock;           /* protects sb_work and work_queued */
 105 };
 106
 107 #define SF_INTL         0x0001          /* International filesystem. */
 108 #define SF_BM_VALID     0x0002          /* Bitmap is valid. */
 109 #define SF_IMMUTABLE    0x0004          /* Protection bits cannot be changed */
 110 #define SF_QUIET        0x0008          /* chmod errors will be not reported */
 111 #define SF_SETUID       0x0010          /* Ignore Amiga uid */
 112 #define SF_SETGID       0x0020          /* Ignore Amiga gid */
 113 #define SF_SETMODE      0x0040          /* Ignore Amiga protection bits */
 114 #define SF_MUFS         0x0100          /* Use MUFS uid/gid mapping */
 115 #define SF_OFS          0x0200          /* Old filesystem */
 116 #define SF_PREFIX       0x0400          /* Buffer for prefix is allocated */
 117 #define SF_VERBOSE      0x0800          /* Talk about fs when mounting */
 118 #define SF_NO_TRUNCATE  0x1000          /* Don't truncate filenames */
 119
 120 /* short cut to get to the affs specific sb data */
 121 static inline struct affs_sb_info *AFFS_SB(struct super_block *sb)
 122 {
 123         return sb->s_fs_info;
 124 }
 125
 126 void affs_mark_sb_dirty(struct super_block *sb);
 127
 128 /* amigaffs.c */
 129
 130 extern int      affs_insert_hash(struct inode *inode, struct buffer_head *bh);
 131 extern int      affs_remove_hash(struct inode *dir, struct buffer_head *rem_bh);
 132 extern int      affs_remove_header(struct dentry *dentry);
 133 extern u32      affs_checksum_block(struct super_block *sb, struct buffer_head *bh);
 134 extern void     affs_fix_checksum(struct super_block *sb, struct buffer_head *bh);
 135 extern void     secs_to_datestamp(time_t secs, struct affs_date *ds);
 136 extern umode_t  prot_to_mode(u32 prot);
 137 extern void     mode_to_prot(struct inode *inode);
 138 extern void     affs_error(struct super_block *sb, const char *function,
 139                            const char *fmt, ...);
 140 extern void     affs_warning(struct super_block *sb, const char *function,
 141                              const char *fmt, ...);
 142 extern bool     affs_nofilenametruncate(const struct dentry *dentry);
 143 extern int      affs_check_name(const unsigned char *name, int len,
 144                                 bool notruncate);
 145 extern int      affs_copy_name(unsigned char *bstr, struct dentry *dentry);
 146
 147 /* bitmap. c */
 148
 149 extern u32      affs_count_free_blocks(struct super_block *s);
 150 extern void     affs_free_block(struct super_block *sb, u32 block);
 151 extern u32      affs_alloc_block(struct inode *inode, u32 goal);
 152 extern int      affs_init_bitmap(struct super_block *sb, int *flags);
 153 extern void     affs_free_bitmap(struct super_block *sb);
 154
 155 /* namei.c */
 156
 157 extern int      affs_hash_name(struct super_block *sb, const u8 *name, unsigned int len);
 158 extern struct dentry *affs_lookup(struct inode *dir, struct dentry *dentry, unsigned int);
 159 extern int      affs_unlink(struct inode *dir, struct dentry *dentry);
 160 extern int      affs_create(struct inode *dir, struct dentry *dentry, umode_t mode, bool);
 161 extern int      affs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode);
 162 extern int      affs_rmdir(struct inode *dir, struct dentry *dentry);
 163 extern int      affs_link(struct dentry *olddentry, struct inode *dir,
 164                           struct dentry *dentry);
 165 extern int      affs_symlink(struct inode *dir, struct dentry *dentry,
 166                              const char *symname);
 167 extern int      affs_rename(struct inode *old_dir, struct dentry *old_dentry,
 168                             struct inode *new_dir, struct dentry *new_dentry);
 169
 170 /* inode.c */
 171
 172 extern unsigned long             affs_parent_ino(struct inode *dir);
 173 extern struct inode             *affs_new_inode(struct inode *dir);
 174 extern int                       affs_notify_change(struct dentry *dentry, struct iattr *attr);
 175 extern void                      affs_evict_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,
 179                                         struct writeback_control *wbc);
 180 extern int                       affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s32 type);
 181
 182 /* file.c */
 183
 184 void            affs_free_prealloc(struct inode *inode);
 185 extern void     affs_truncate(struct inode *);
 186 int             affs_file_fsync(struct file *, loff_t, loff_t, int);
 187
 188 /* dir.c */
 189
 190 extern void   affs_dir_truncate(struct inode *);
 191
 192 /* jump tables */
 193
 194 extern const struct inode_operations     affs_file_inode_operations;
 195 extern const struct inode_operations     affs_dir_inode_operations;
 196 extern const struct inode_operations   affs_symlink_inode_operations;
 197 extern const struct file_operations      affs_file_operations;
 198 extern const struct file_operations      affs_file_operations_ofs;
 199 extern const struct file_operations      affs_dir_operations;
 200 extern const struct address_space_operations     affs_symlink_aops;
 201 extern const struct address_space_operations     affs_aops;
 202 extern const struct address_space_operations     affs_aops_ofs;
 203
 204 extern const struct dentry_operations    affs_dentry_operations;
 205 extern const struct dentry_operations    affs_intl_dentry_operations;
 206
 207 static inline void
 208 affs_set_blocksize(struct super_block *sb, int size)
 209 {
 210         sb_set_blocksize(sb, size);
 211 }
 212 static inline struct buffer_head *
 213 affs_bread(struct super_block *sb, int block)
 214 {
 215         pr_debug("%s: %d\n", __func__, block);
 216         if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size)
 217                 return sb_bread(sb, block);
 218         return NULL;
 219 }
 220 static inline struct buffer_head *
 221 affs_getblk(struct super_block *sb, int block)
 222 {
 223         pr_debug("%s: %d\n", __func__, block);
 224         if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size)
 225                 return sb_getblk(sb, block);
 226         return NULL;
 227 }
 228 static inline struct buffer_head *
 229 affs_getzeroblk(struct super_block *sb, int block)
 230 {
 231         struct buffer_head *bh;
 232         pr_debug("%s: %d\n", __func__, block);
 233         if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size) {
 234                 bh = sb_getblk(sb, block);
 235                 lock_buffer(bh);
 236                 memset(bh->b_data, 0 , sb->s_blocksize);
 237                 set_buffer_uptodate(bh);
 238                 unlock_buffer(bh);
 239                 return bh;
 240         }
 241         return NULL;
 242 }
 243 static inline struct buffer_head *
 244 affs_getemptyblk(struct super_block *sb, int block)
 245 {
 246         struct buffer_head *bh;
 247         pr_debug("%s: %d\n", __func__, block);
 248         if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size) {
 249                 bh = sb_getblk(sb, block);
 250                 wait_on_buffer(bh);
 251                 set_buffer_uptodate(bh);
 252                 return bh;
 253         }
 254         return NULL;
 255 }
 256 static inline void
 257 affs_brelse(struct buffer_head *bh)
 258 {
 259         if (bh)
 260                 pr_debug("%s: %lld\n", __func__, (long long) bh->b_blocknr);
 261         brelse(bh);
 262 }
 263
 264 static inline void
 265 affs_adjust_checksum(struct buffer_head *bh, u32 val)
 266 {
 267         u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[5]);
 268         ((__be32 *)bh->b_data)[5] = cpu_to_be32(tmp - val);
 269 }
 270 static inline void
 271 affs_adjust_bitmapchecksum(struct buffer_head *bh, u32 val)
 272 {
 273         u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[0]);
 274         ((__be32 *)bh->b_data)[0] = cpu_to_be32(tmp - val);
 275 }
 276
 277 static inline void
 278 affs_lock_link(struct inode *inode)
 279 {
 280         down(&AFFS_I(inode)->i_link_lock);
 281 }
 282 static inline void
 283 affs_unlock_link(struct inode *inode)
 284 {
 285         up(&AFFS_I(inode)->i_link_lock);
 286 }
 287 static inline void
 288 affs_lock_dir(struct inode *inode)
 289 {
 290         down(&AFFS_I(inode)->i_hash_lock);
 291 }
 292 static inline void
 293 affs_unlock_dir(struct inode *inode)
 294 {
 295         up(&AFFS_I(inode)->i_hash_lock);
 296 }
 297 static inline void
 298 affs_lock_ext(struct inode *inode)
 299 {
 300         down(&AFFS_I(inode)->i_ext_lock);
 301 }
 302 static inline void
 303 affs_unlock_ext(struct inode *inode)
 304 {
 305         up(&AFFS_I(inode)->i_ext_lock);
 306 }