LXR linux/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
  43struct 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 */
  51struct 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 */
  73static 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
  85struct affs_bm_info {
  86        u32 bm_key;                     /* Disk block number */
  87        u32 bm_free;                    /* Free blocks in here */
  88};
  89
  90struct 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 */
 126static inline struct affs_sb_info *AFFS_SB(struct super_block *sb)
 127{
 128        return sb->s_fs_info;
 129}
 130
 131/* amigaffs.c */
 132
 133extern int      affs_insert_hash(struct inode *inode, struct buffer_head *bh);
 134extern int      affs_remove_hash(struct inode *dir, struct buffer_head *rem_bh);
 135extern int      affs_remove_header(struct dentry *dentry);
 136extern u32      affs_checksum_block(struct super_block *sb, struct buffer_head *bh);
 137extern void     affs_fix_checksum(struct super_block *sb, struct buffer_head *bh);
 138extern void     secs_to_datestamp(time_t secs, struct affs_date *ds);
 139extern mode_t   prot_to_mode(u32 prot);
 140extern void     mode_to_prot(struct inode *inode);
 141extern void     affs_error(struct super_block *sb, const char *function, const char *fmt, ...);
 142extern void     affs_warning(struct super_block *sb, const char *function, const char *fmt, ...);
 143extern int      affs_check_name(const unsigned char *name, int len);
 144extern int      affs_copy_name(unsigned char *bstr, struct dentry *dentry);
 145
 146/* bitmap. c */
 147
 148extern u32      affs_count_free_blocks(struct super_block *s);
 149extern void     affs_free_block(struct super_block *sb, u32 block);
 150extern u32      affs_alloc_block(struct inode *inode, u32 goal);
 151extern int      affs_init_bitmap(struct super_block *sb, int *flags);
 152extern void     affs_free_bitmap(struct super_block *sb);
 153
 154/* namei.c */
 155
 156extern int      affs_hash_name(struct super_block *sb, const u8 *name, unsigned int len);
 157extern struct dentry *affs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *);
 158extern int      affs_unlink(struct inode *dir, struct dentry *dentry);
 159extern int      affs_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *);
 160extern int      affs_mkdir(struct inode *dir, struct dentry *dentry, int mode);
 161extern int      affs_rmdir(struct inode *dir, struct dentry *dentry);
 162extern int      affs_link(struct dentry *olddentry, struct inode *dir,
 163                          struct dentry *dentry);
 164extern int      affs_symlink(struct inode *dir, struct dentry *dentry,
 165                             const char *symname);
 166extern 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
 171extern unsigned long             affs_parent_ino(struct inode *dir);
 172extern struct inode             *affs_new_inode(struct inode *dir);
 173extern int                       affs_notify_change(struct dentry *dentry, struct iattr *attr);
 174extern void                      affs_delete_inode(struct inode *inode);
 175extern void                      affs_clear_inode(struct inode *inode);
 176extern struct inode             *affs_iget(struct super_block *sb,
 177                                        unsigned long ino);
 178extern int                       affs_write_inode(struct inode *inode, int);
 179extern int                       affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s32 type);
 180
 181/* file.c */
 182
 183void            affs_free_prealloc(struct inode *inode);
 184extern void     affs_truncate(struct inode *);
 185int             affs_file_fsync(struct file *, struct dentry *, int);
 186
 187/* dir.c */
 188
 189extern void   affs_dir_truncate(struct inode *);
 190
 191/* jump tables */
 192
 193extern const struct inode_operations     affs_file_inode_operations;
 194extern const struct inode_operations     affs_dir_inode_operations;
 195extern const struct inode_operations   affs_symlink_inode_operations;
 196extern const struct file_operations      affs_file_operations;
 197extern const struct file_operations      affs_file_operations_ofs;
 198extern const struct file_operations      affs_dir_operations;
 199extern const struct address_space_operations     affs_symlink_aops;
 200extern const struct address_space_operations     affs_aops;
 201extern const struct address_space_operations     affs_aops_ofs;
 202
 203extern const struct dentry_operations    affs_dentry_operations;
 204
 205static inline void
 206affs_set_blocksize(struct super_block *sb, int size)
 207{
 208        sb_set_blocksize(sb, size);
 209}
 210static inline struct buffer_head *
 211affs_bread(struct super_block *sb, int block)
 212{
 213        pr_debug("affs_bread: %d\n", block);
 214        if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size)
 215                return sb_bread(sb, block);
 216        return NULL;
 217}
 218static inline struct buffer_head *
 219affs_getblk(struct super_block *sb, int block)
 220{
 221        pr_debug("affs_getblk: %d\n", block);
 222        if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size)
 223                return sb_getblk(sb, block);
 224        return NULL;
 225}
 226static inline struct buffer_head *
 227affs_getzeroblk(struct super_block *sb, int block)
 228{
 229        struct buffer_head *bh;
 230        pr_debug("affs_getzeroblk: %d\n", block);
 231        if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size) {
 232                bh = sb_getblk(sb, block);
 233                lock_buffer(bh);
 234                memset(bh->b_data, 0 , sb->s_blocksize);
 235                set_buffer_uptodate(bh);
 236                unlock_buffer(bh);
 237                return bh;
 238        }
 239        return NULL;
 240}
 241static inline struct buffer_head *
 242affs_getemptyblk(struct super_block *sb, int block)
 243{
 244        struct buffer_head *bh;
 245        pr_debug("affs_getemptyblk: %d\n", block);
 246        if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size) {
 247                bh = sb_getblk(sb, block);
 248                wait_on_buffer(bh);
 249                set_buffer_uptodate(bh);
 250                return bh;
 251        }
 252        return NULL;
 253}
 254static inline void
 255affs_brelse(struct buffer_head *bh)
 256{
 257        if (bh)
 258                pr_debug("affs_brelse: %lld\n", (long long) bh->b_blocknr);
 259        brelse(bh);
 260}
 261
 262static inline void
 263affs_adjust_checksum(struct buffer_head *bh, u32 val)
 264{
 265        u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[5]);
 266        ((__be32 *)bh->b_data)[5] = cpu_to_be32(tmp - val);
 267}
 268static inline void
 269affs_adjust_bitmapchecksum(struct buffer_head *bh, u32 val)
 270{
 271        u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[0]);
 272        ((__be32 *)bh->b_data)[0] = cpu_to_be32(tmp - val);
 273}
 274
 275static inline void
 276affs_lock_link(struct inode *inode)
 277{
 278        down(&AFFS_I(inode)->i_link_lock);
 279}
 280static inline void
 281affs_unlock_link(struct inode *inode)
 282{
 283        up(&AFFS_I(inode)->i_link_lock);
 284}
 285static inline void
 286affs_lock_dir(struct inode *inode)
 287{
 288        down(&AFFS_I(inode)->i_hash_lock);
 289}
 290static inline void
 291affs_unlock_dir(struct inode *inode)
 292{
 293        up(&AFFS_I(inode)->i_hash_lock);
 294}
 295static inline void
 296affs_lock_ext(struct inode *inode)
 297{
 298        down(&AFFS_I(inode)->i_ext_lock);
 299}
 300static inline void
 301affs_unlock_ext(struct inode *inode)
 302{
 303        up(&AFFS_I(inode)->i_ext_lock);
 304}
 305