LXR linux/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#define AFFSNAMEMAX 30U
  34
  35struct affs_ext_key {
  36        u32     ext;                            /* idx of the extended block */
  37        u32     key;                            /* block number */
  38};
  39
  40/*
  41 * affs fs inode data in memory
  42 */
  43struct affs_inode_info {
  44        atomic_t i_opencnt;
  45        struct semaphore i_link_lock;           /* Protects internal inode access. */
  46        struct semaphore i_ext_lock;            /* Protects internal inode access. */
  47#define i_hash_lock i_ext_lock
  48        u32      i_blkcnt;                      /* block count */
  49        u32      i_extcnt;                      /* extended block count */
  50        u32     *i_lc;                          /* linear cache of extended blocks */
  51        u32      i_lc_size;
  52        u32      i_lc_shift;
  53        u32      i_lc_mask;
  54        struct affs_ext_key *i_ac;              /* associative cache of extended blocks */
  55        u32      i_ext_last;                    /* last accessed extended block */
  56        struct buffer_head *i_ext_bh;           /* bh of last extended block */
  57        loff_t   mmu_private;
  58        u32      i_protect;                     /* unused attribute bits */
  59        u32      i_lastalloc;                   /* last allocated block */
  60        int      i_pa_cnt;                      /* number of preallocated blocks */
  61        struct inode vfs_inode;
  62};
  63
  64/* short cut to get to the affs specific inode data */
  65static inline struct affs_inode_info *AFFS_I(struct inode *inode)
  66{
  67        return container_of(inode, struct affs_inode_info, vfs_inode);
  68}
  69
  70/*
  71 * super-block data in memory
  72 *
  73 * Block numbers are adjusted for their actual size
  74 *
  75 */
  76
  77struct affs_bm_info {
  78        u32 bm_key;                     /* Disk block number */
  79        u32 bm_free;                    /* Free blocks in here */
  80};
  81
  82struct affs_sb_info {
  83        int s_partition_size;           /* Partition size in blocks. */
  84        int s_reserved;                 /* Number of reserved blocks. */
  85        //u32 s_blksize;                        /* Initial device blksize */
  86        u32 s_data_blksize;             /* size of the data block w/o header */
  87        u32 s_root_block;               /* FFS root block number. */
  88        int s_hashsize;                 /* Size of hash table. */
  89        unsigned long s_flags;          /* See below. */
  90        kuid_t s_uid;                   /* uid to override */
  91        kgid_t s_gid;                   /* gid to override */
  92        umode_t s_mode;                 /* mode to override */
  93        struct buffer_head *s_root_bh;  /* Cached root block. */
  94        struct mutex s_bmlock;          /* Protects bitmap access. */
  95        struct affs_bm_info *s_bitmap;  /* Bitmap infos. */
  96        u32 s_bmap_count;               /* # of bitmap blocks. */
  97        u32 s_bmap_bits;                /* # of bits in one bitmap blocks */
  98        u32 s_last_bmap;
  99        struct buffer_head *s_bmap_bh;
 100        char *s_prefix;                 /* Prefix for volumes and assigns. */
 101        char s_volume[32];              /* Volume prefix for absolute symlinks. */
 102        spinlock_t symlink_lock;        /* protects the previous two */
 103        struct super_block *sb;         /* the VFS superblock object */
 104        int work_queued;                /* non-zero delayed work is queued */
 105        struct delayed_work sb_work;    /* superblock flush delayed work */
 106        spinlock_t work_lock;           /* protects sb_work and work_queued */
 107};
 108
 109#define AFFS_MOUNT_SF_INTL              0x0001 /* International filesystem. */
 110#define AFFS_MOUNT_SF_BM_VALID          0x0002 /* Bitmap is valid. */
 111#define AFFS_MOUNT_SF_IMMUTABLE         0x0004 /* Protection bits cannot be changed */
 112#define AFFS_MOUNT_SF_QUIET             0x0008 /* chmod errors will be not reported */
 113#define AFFS_MOUNT_SF_SETUID            0x0010 /* Ignore Amiga uid */
 114#define AFFS_MOUNT_SF_SETGID            0x0020 /* Ignore Amiga gid */
 115#define AFFS_MOUNT_SF_SETMODE           0x0040 /* Ignore Amiga protection bits */
 116#define AFFS_MOUNT_SF_MUFS              0x0100 /* Use MUFS uid/gid mapping */
 117#define AFFS_MOUNT_SF_OFS               0x0200 /* Old filesystem */
 118#define AFFS_MOUNT_SF_PREFIX            0x0400 /* Buffer for prefix is allocated */
 119#define AFFS_MOUNT_SF_VERBOSE           0x0800 /* Talk about fs when mounting */
 120#define AFFS_MOUNT_SF_NO_TRUNCATE       0x1000 /* Don't truncate filenames */
 121
 122#define affs_clear_opt(o, opt)    (o &= ~AFFS_MOUNT_##opt)
 123#define affs_set_opt(o, opt)      (o |= AFFS_MOUNT_##opt)
 124#define affs_test_opt(o, opt)     ((o) & AFFS_MOUNT_##opt)
 125
 126/* short cut to get to the affs specific sb data */
 127static inline struct affs_sb_info *AFFS_SB(struct super_block *sb)
 128{
 129        return sb->s_fs_info;
 130}
 131
 132void affs_mark_sb_dirty(struct super_block *sb);
 133
 134/* amigaffs.c */
 135
 136extern int      affs_insert_hash(struct inode *inode, struct buffer_head *bh);
 137extern int      affs_remove_hash(struct inode *dir, struct buffer_head *rem_bh);
 138extern int      affs_remove_header(struct dentry *dentry);
 139extern u32      affs_checksum_block(struct super_block *sb, struct buffer_head *bh);
 140extern void     affs_fix_checksum(struct super_block *sb, struct buffer_head *bh);
 141extern void     secs_to_datestamp(time64_t secs, struct affs_date *ds);
 142extern umode_t  prot_to_mode(u32 prot);
 143extern void     mode_to_prot(struct inode *inode);
 144__printf(3, 4)
 145extern void     affs_error(struct super_block *sb, const char *function,
 146                           const char *fmt, ...);
 147__printf(3, 4)
 148extern void     affs_warning(struct super_block *sb, const char *function,
 149                             const char *fmt, ...);
 150extern bool     affs_nofilenametruncate(const struct dentry *dentry);
 151extern int      affs_check_name(const unsigned char *name, int len,
 152                                bool notruncate);
 153extern int      affs_copy_name(unsigned char *bstr, struct dentry *dentry);
 154
 155/* bitmap. c */
 156
 157extern u32      affs_count_free_blocks(struct super_block *s);
 158extern void     affs_free_block(struct super_block *sb, u32 block);
 159extern u32      affs_alloc_block(struct inode *inode, u32 goal);
 160extern int      affs_init_bitmap(struct super_block *sb, int *flags);
 161extern void     affs_free_bitmap(struct super_block *sb);
 162
 163/* namei.c */
 164
 165extern int      affs_hash_name(struct super_block *sb, const u8 *name, unsigned int len);
 166extern struct dentry *affs_lookup(struct inode *dir, struct dentry *dentry, unsigned int);
 167extern int      affs_unlink(struct inode *dir, struct dentry *dentry);
 168extern int      affs_create(struct inode *dir, struct dentry *dentry, umode_t mode, bool);
 169extern int      affs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode);
 170extern int      affs_rmdir(struct inode *dir, struct dentry *dentry);
 171extern int      affs_link(struct dentry *olddentry, struct inode *dir,
 172                          struct dentry *dentry);
 173extern int      affs_symlink(struct inode *dir, struct dentry *dentry,
 174                             const char *symname);
 175extern int      affs_rename(struct inode *old_dir, struct dentry *old_dentry,
 176                            struct inode *new_dir, struct dentry *new_dentry,
 177                            unsigned int flags);
 178
 179/* inode.c */
 180
 181extern unsigned long             affs_parent_ino(struct inode *dir);
 182extern struct inode             *affs_new_inode(struct inode *dir);
 183extern int                       affs_notify_change(struct dentry *dentry, struct iattr *attr);
 184extern void                      affs_evict_inode(struct inode *inode);
 185extern struct inode             *affs_iget(struct super_block *sb,
 186                                        unsigned long ino);
 187extern int                       affs_write_inode(struct inode *inode,
 188                                        struct writeback_control *wbc);
 189extern int                       affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s32 type);
 190
 191/* file.c */
 192
 193void            affs_free_prealloc(struct inode *inode);
 194extern void     affs_truncate(struct inode *);
 195int             affs_file_fsync(struct file *, loff_t, loff_t, int);
 196
 197/* dir.c */
 198
 199extern void   affs_dir_truncate(struct inode *);
 200
 201/* jump tables */
 202
 203extern const struct inode_operations     affs_file_inode_operations;
 204extern const struct inode_operations     affs_dir_inode_operations;
 205extern const struct inode_operations   affs_symlink_inode_operations;
 206extern const struct file_operations      affs_file_operations;
 207extern const struct file_operations      affs_file_operations_ofs;
 208extern const struct file_operations      affs_dir_operations;
 209extern const struct address_space_operations     affs_symlink_aops;
 210extern const struct address_space_operations     affs_aops;
 211extern const struct address_space_operations     affs_aops_ofs;
 212
 213extern const struct dentry_operations    affs_dentry_operations;
 214extern const struct dentry_operations    affs_intl_dentry_operations;
 215
 216static inline void
 217affs_set_blocksize(struct super_block *sb, int size)
 218{
 219        sb_set_blocksize(sb, size);
 220}
 221static inline struct buffer_head *
 222affs_bread(struct super_block *sb, int block)
 223{
 224        pr_debug("%s: %d\n", __func__, block);
 225        if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size)
 226                return sb_bread(sb, block);
 227        return NULL;
 228}
 229static inline struct buffer_head *
 230affs_getblk(struct super_block *sb, int block)
 231{
 232        pr_debug("%s: %d\n", __func__, block);
 233        if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size)
 234                return sb_getblk(sb, block);
 235        return NULL;
 236}
 237static inline struct buffer_head *
 238affs_getzeroblk(struct super_block *sb, int block)
 239{
 240        struct buffer_head *bh;
 241        pr_debug("%s: %d\n", __func__, block);
 242        if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size) {
 243                bh = sb_getblk(sb, block);
 244                lock_buffer(bh);
 245                memset(bh->b_data, 0 , sb->s_blocksize);
 246                set_buffer_uptodate(bh);
 247                unlock_buffer(bh);
 248                return bh;
 249        }
 250        return NULL;
 251}
 252static inline struct buffer_head *
 253affs_getemptyblk(struct super_block *sb, int block)
 254{
 255        struct buffer_head *bh;
 256        pr_debug("%s: %d\n", __func__, block);
 257        if (block >= AFFS_SB(sb)->s_reserved && block < AFFS_SB(sb)->s_partition_size) {
 258                bh = sb_getblk(sb, block);
 259                wait_on_buffer(bh);
 260                set_buffer_uptodate(bh);
 261                return bh;
 262        }
 263        return NULL;
 264}
 265static inline void
 266affs_brelse(struct buffer_head *bh)
 267{
 268        if (bh)
 269                pr_debug("%s: %lld\n", __func__, (long long) bh->b_blocknr);
 270        brelse(bh);
 271}
 272
 273static inline void
 274affs_adjust_checksum(struct buffer_head *bh, u32 val)
 275{
 276        u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[5]);
 277        ((__be32 *)bh->b_data)[5] = cpu_to_be32(tmp - val);
 278}
 279static inline void
 280affs_adjust_bitmapchecksum(struct buffer_head *bh, u32 val)
 281{
 282        u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[0]);
 283        ((__be32 *)bh->b_data)[0] = cpu_to_be32(tmp - val);
 284}
 285
 286static inline void
 287affs_lock_link(struct inode *inode)
 288{
 289        down(&AFFS_I(inode)->i_link_lock);
 290}
 291static inline void
 292affs_unlock_link(struct inode *inode)
 293{
 294        up(&AFFS_I(inode)->i_link_lock);
 295}
 296static inline void
 297affs_lock_dir(struct inode *inode)
 298{
 299        down(&AFFS_I(inode)->i_hash_lock);
 300}
 301static inline void
 302affs_unlock_dir(struct inode *inode)
 303{
 304        up(&AFFS_I(inode)->i_hash_lock);
 305}
 306static inline void
 307affs_lock_ext(struct inode *inode)
 308{
 309        down(&AFFS_I(inode)->i_ext_lock);
 310}
 311static inline void
 312affs_unlock_ext(struct inode *inode)
 313{
 314        up(&AFFS_I(inode)->i_ext_lock);
 315}
 316