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#include <linux/workqueue.h>
   7
   8/* AmigaOS allows file names with up to 30 characters length.
   9 * Names longer than that will be silently truncated. If you
  10 * want to disallow this, comment out the following #define.
  11 * Creating filesystem objects with longer names will then
  12 * result in an error (ENAMETOOLONG).
  13 */
  14/*#define AFFS_NO_TRUNCATE */
  15
  16/* Ugly macros make the code more pretty. */
  17
  18#define GET_END_PTR(st,p,sz)             ((st *)((char *)(p)+((sz)-sizeof(st))))
  19#define AFFS_GET_HASHENTRY(data,hashkey) be32_to_cpu(((struct dir_front *)data)->hashtable[hashkey])
  20#define AFFS_BLOCK(sb, bh, blk)         (AFFS_HEAD(bh)->table[AFFS_SB(sb)->s_hashsize-1-(blk)])
  21
  22#define AFFS_HEAD(bh)           ((struct affs_head *)(bh)->b_data)
  23#define AFFS_TAIL(sb, bh)       ((struct affs_tail *)((bh)->b_data+(sb)->s_blocksize-sizeof(struct affs_tail)))
  24#define AFFS_ROOT_HEAD(bh)      ((struct affs_root_head *)(bh)->b_data)
  25#define AFFS_ROOT_TAIL(sb, bh)  ((struct affs_root_tail *)((bh)->b_data+(sb)->s_blocksize-sizeof(struct affs_root_tail)))
  26#define AFFS_DATA_HEAD(bh)      ((struct affs_data_head *)(bh)->b_data)
  27#define AFFS_DATA(bh)           (((struct affs_data_head *)(bh)->b_data)->data)
  28
  29#define AFFS_CACHE_SIZE         PAGE_SIZE
  30
  31#define AFFS_MAX_PREALLOC       32
  32#define AFFS_LC_SIZE            (AFFS_CACHE_SIZE/sizeof(u32)/2)
  33#define AFFS_AC_SIZE            (AFFS_CACHE_SIZE/sizeof(struct affs_ext_key)/2)
  34#define AFFS_AC_MASK            (AFFS_AC_SIZE-1)
  35
  36struct affs_ext_key {
  37        u32     ext;                            /* idx of the extended block */
  38        u32     key;                            /* block number */
  39};
  40
  41/*
  42 * affs fs inode data in memory
  43 */
  44struct affs_inode_info {
  45        atomic_t i_opencnt;
  46        struct semaphore i_link_lock;           /* Protects internal inode access. */
  47        struct semaphore i_ext_lock;            /* Protects internal inode access. */
  48#define i_hash_lock i_ext_lock
  49        u32      i_blkcnt;                      /* block count */
  50        u32      i_extcnt;                      /* extended block count */
  51        u32     *i_lc;                          /* linear cache of extended blocks */
  52        u32      i_lc_size;
  53        u32      i_lc_shift;
  54        u32      i_lc_mask;
  55        struct affs_ext_key *i_ac;              /* associative cache of extended blocks */
  56        u32      i_ext_last;                    /* last accessed extended block */
  57        struct buffer_head *i_ext_bh;           /* bh of last extended block */
  58        loff_t   mmu_private;
  59        u32      i_protect;                     /* unused attribute bits */
  60        u32      i_lastalloc;                   /* last allocated block */
  61        int      i_pa_cnt;                      /* number of preallocated blocks */
  62        struct inode vfs_inode;
  63};
  64
  65/* short cut to get to the affs specific inode data */
  66static inline struct affs_inode_info *AFFS_I(struct inode *inode)
  67{
  68        return list_entry(inode, struct affs_inode_info, vfs_inode);
  69}
  70
  71/*
  72 * super-block data in memory
  73 *
  74 * Block numbers are adjusted for their actual size
  75 *
  76 */
  77
  78struct affs_bm_info {
  79        u32 bm_key;                     /* Disk block number */
  80        u32 bm_free;                    /* Free blocks in here */
  81};
  82
  83struct affs_sb_info {
  84        int s_partition_size;           /* Partition size in blocks. */
  85        int s_reserved;                 /* Number of reserved blocks. */
  86        //u32 s_blksize;                        /* Initial device blksize */
  87        u32 s_data_blksize;             /* size of the data block w/o header */
  88        u32 s_root_block;               /* FFS root block number. */
  89        int s_hashsize;                 /* Size of hash table. */
  90        unsigned long s_flags;          /* See below. */
  91        kuid_t s_uid;                   /* uid to override */
  92        kgid_t s_gid;                   /* gid to override */
  93        umode_t s_mode;                 /* mode to override */
  94        struct buffer_head *s_root_bh;  /* Cached root block. */
  95        struct mutex s_bmlock;          /* Protects bitmap access. */
  96        struct affs_bm_info *s_bitmap;  /* Bitmap infos. */
  97        u32 s_bmap_count;               /* # of bitmap blocks. */
  98        u32 s_bmap_bits;                /* # of bits in one bitmap blocks */
  99        u32 s_last_bmap;
 100        struct buffer_head *s_bmap_bh;
 101        char *s_prefix;                 /* Prefix for volumes and assigns. */
 102        char s_volume[32];              /* Volume prefix for absolute symlinks. */
 103        spinlock_t symlink_lock;        /* protects the previous two */
 104        struct super_block *sb;         /* the VFS superblock object */
 105        int work_queued;                /* non-zero delayed work is queued */
 106        struct delayed_work sb_work;    /* superblock flush delayed work */
 107        spinlock_t work_lock;           /* protects sb_work and work_queued */
 108};
 109
 110#define SF_INTL         0x0001          /* International filesystem. */
 111#define SF_BM_VALID     0x0002          /* Bitmap is valid. */
 112#define SF_IMMUTABLE    0x0004          /* Protection bits cannot be changed */
 113#define SF_QUIET        0x0008          /* chmod errors will be not reported */
 114#define SF_SETUID       0x0010          /* Ignore Amiga uid */
 115#define SF_SETGID       0x0020          /* Ignore Amiga gid */
 116#define SF_SETMODE      0x0040          /* Ignore Amiga protection bits */
 117#define SF_MUFS         0x0100          /* Use MUFS uid/gid mapping */
 118#define SF_OFS          0x0200          /* Old filesystem */
 119#define SF_PREFIX       0x0400          /* Buffer for prefix is allocated */
 120#define SF_VERBOSE      0x0800          /* Talk about fs when mounting */
 121
 122/* short cut to get to the affs specific sb data */
 123static inline struct affs_sb_info *AFFS_SB(struct super_block *sb)
 124{
 125        return sb->s_fs_info;
 126}
 127
 128void affs_mark_sb_dirty(struct super_block *sb);
 129
 130/* amigaffs.c */
 131
 132extern int      affs_insert_hash(struct inode *inode, struct buffer_head *bh);
 133extern int      affs_remove_hash(struct inode *dir, struct buffer_head *rem_bh);
 134extern int      affs_remove_header(struct dentry *dentry);
 135extern u32      affs_checksum_block(struct super_block *sb, struct buffer_head *bh);
 136extern void     affs_fix_checksum(struct super_block *sb, struct buffer_head *bh);
 137extern void     secs_to_datestamp(time_t secs, struct affs_date *ds);
 138extern umode_t  prot_to_mode(u32 prot);
 139extern void     mode_to_prot(struct inode *inode);
 140extern void     affs_error(struct super_block *sb, const char *function, const char *fmt, ...);
 141extern void     affs_warning(struct super_block *sb, const char *function, const char *fmt, ...);
 142extern int      affs_check_name(const unsigned char *name, int len);
 143extern int      affs_copy_name(unsigned char *bstr, struct dentry *dentry);
 144
 145/* bitmap. c */
 146
 147extern u32      affs_count_free_blocks(struct super_block *s);
 148extern void     affs_free_block(struct super_block *sb, u32 block);
 149extern u32      affs_alloc_block(struct inode *inode, u32 goal);
 150extern int      affs_init_bitmap(struct super_block *sb, int *flags);
 151extern void     affs_free_bitmap(struct super_block *sb);
 152
 153/* namei.c */
 154
 155extern int      affs_hash_name(struct super_block *sb, const u8 *name, unsigned int len);
 156extern struct dentry *affs_lookup(struct inode *dir, struct dentry *dentry, unsigned int);
 157extern int      affs_unlink(struct inode *dir, struct dentry *dentry);
 158extern int      affs_create(struct inode *dir, struct dentry *dentry, umode_t mode, bool);
 159extern int      affs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode);
 160extern int      affs_rmdir(struct inode *dir, struct dentry *dentry);
 161extern int      affs_link(struct dentry *olddentry, struct inode *dir,
 162                          struct dentry *dentry);
 163extern int      affs_symlink(struct inode *dir, struct dentry *dentry,
 164                             const char *symname);
 165extern int      affs_rename(struct inode *old_dir, struct dentry *old_dentry,
 166                            struct inode *new_dir, struct dentry *new_dentry);
 167
 168/* inode.c */
 169
 170extern unsigned long             affs_parent_ino(struct inode *dir);
 171extern struct inode             *affs_new_inode(struct inode *dir);
 172extern int                       affs_notify_change(struct dentry *dentry, struct iattr *attr);
 173extern void                      affs_evict_inode(struct inode *inode);
 174extern struct inode             *affs_iget(struct super_block *sb,
 175                                        unsigned long ino);
 176extern int                       affs_write_inode(struct inode *inode,
 177                                        struct writeback_control *wbc);
 178extern int                       affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s32 type);
 179
 180/* file.c */
 181
 182void            affs_free_prealloc(struct inode *inode);
 183extern void     affs_truncate(struct inode *);
 184int             affs_file_fsync(struct file *, loff_t, loff_t, int);
 185
 186/* dir.c */
 187
 188extern void   affs_dir_truncate(struct inode *);
 189
 190/* jump tables */
 191
 192extern const struct inode_operations     affs_file_inode_operations;
 193extern const struct inode_operations     affs_dir_inode_operations;
 194extern const struct inode_operations   affs_symlink_inode_operations;
 195extern const struct file_operations      affs_file_operations;
 196extern const struct file_operations      affs_file_operations_ofs;
 197extern const struct file_operations      affs_dir_operations;
 198extern const struct address_space_operations     affs_symlink_aops;
 199extern const struct address_space_operations     affs_aops;
 200extern const struct address_space_operations     affs_aops_ofs;
 201
 202extern const struct dentry_operations    affs_dentry_operations;
 203extern const struct dentry_operations    affs_intl_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