LXR linux/fs/hfs/hfs

   1/*
   2 *  linux/fs/hfs/hfs_fs.h
   3 *
   4 * Copyright (C) 1995-1997  Paul H. Hargrove
   5 * (C) 2003 Ardis Technologies <roman@ardistech.com>
   6 * This file may be distributed under the terms of the GNU General Public License.
   7 */
   8
   9#ifndef _LINUX_HFS_FS_H
  10#define _LINUX_HFS_FS_H
  11
  12#include <linux/slab.h>
  13#include <linux/types.h>
  14#include <linux/mutex.h>
  15#include <linux/buffer_head.h>
  16#include <linux/fs.h>
  17
  18#include <asm/byteorder.h>
  19#include <asm/uaccess.h>
  20
  21#include "hfs.h"
  22
  23#define DBG_BNODE_REFS  0x00000001
  24#define DBG_BNODE_MOD   0x00000002
  25#define DBG_CAT_MOD     0x00000004
  26#define DBG_INODE       0x00000008
  27#define DBG_SUPER       0x00000010
  28#define DBG_EXTENT      0x00000020
  29#define DBG_BITMAP      0x00000040
  30
  31//#define DBG_MASK      (DBG_EXTENT|DBG_INODE|DBG_BNODE_MOD|DBG_CAT_MOD|DBG_BITMAP)
  32//#define DBG_MASK      (DBG_BNODE_MOD|DBG_CAT_MOD|DBG_INODE)
  33//#define DBG_MASK      (DBG_CAT_MOD|DBG_BNODE_REFS|DBG_INODE|DBG_EXTENT)
  34#define DBG_MASK        (0)
  35
  36#define dprint(flg, fmt, args...) \
  37        if (flg & DBG_MASK) printk(fmt , ## args)
  38
  39/*
  40 * struct hfs_inode_info
  41 *
  42 * The HFS-specific part of a Linux (struct inode)
  43 */
  44struct hfs_inode_info {
  45        atomic_t opencnt;
  46
  47        unsigned int flags;
  48
  49        /* to deal with localtime ugliness */
  50        int tz_secondswest;
  51
  52        struct hfs_cat_key cat_key;
  53
  54        struct list_head open_dir_list;
  55        struct inode *rsrc_inode;
  56
  57        struct mutex extents_lock;
  58
  59        u16 alloc_blocks, clump_blocks;
  60        sector_t fs_blocks;
  61        /* Allocation extents from catlog record or volume header */
  62        hfs_extent_rec first_extents;
  63        u16 first_blocks;
  64        hfs_extent_rec cached_extents;
  65        u16 cached_start, cached_blocks;
  66
  67        loff_t phys_size;
  68        struct inode vfs_inode;
  69};
  70
  71#define HFS_FLG_RSRC            0x0001
  72#define HFS_FLG_EXT_DIRTY       0x0002
  73#define HFS_FLG_EXT_NEW         0x0004
  74
  75#define HFS_IS_RSRC(inode)      (HFS_I(inode)->flags & HFS_FLG_RSRC)
  76
  77/*
  78 * struct hfs_sb_info
  79 *
  80 * The HFS-specific part of a Linux (struct super_block)
  81 */
  82struct hfs_sb_info {
  83        struct buffer_head *mdb_bh;             /* The hfs_buffer
  84                                                   holding the real
  85                                                   superblock (aka VIB
  86                                                   or MDB) */
  87        struct hfs_mdb *mdb;
  88        struct buffer_head *alt_mdb_bh;         /* The hfs_buffer holding
  89                                                   the alternate superblock */
  90        struct hfs_mdb *alt_mdb;
  91        __be32 *bitmap;                         /* The page holding the
  92                                                   allocation bitmap */
  93        struct hfs_btree *ext_tree;                     /* Information about
  94                                                   the extents b-tree */
  95        struct hfs_btree *cat_tree;                     /* Information about
  96                                                   the catalog b-tree */
  97        u32 file_count;                         /* The number of
  98                                                   regular files in
  99                                                   the filesystem */
 100        u32 folder_count;                       /* The number of
 101                                                   directories in the
 102                                                   filesystem */
 103        u32 next_id;                            /* The next available
 104                                                   file id number */
 105        u32 clumpablks;                         /* The number of allocation
 106                                                   blocks to try to add when
 107                                                   extending a file */
 108        u32 fs_start;                           /* The first 512-byte
 109                                                   block represented
 110                                                   in the bitmap */
 111        u32 part_start;
 112        u16 root_files;                         /* The number of
 113                                                   regular
 114                                                   (non-directory)
 115                                                   files in the root
 116                                                   directory */
 117        u16 root_dirs;                          /* The number of
 118                                                   directories in the
 119                                                   root directory */
 120        u16 fs_ablocks;                         /* The number of
 121                                                   allocation blocks
 122                                                   in the filesystem */
 123        u16 free_ablocks;                       /* the number of unused
 124                                                   allocation blocks
 125                                                   in the filesystem */
 126        u32 alloc_blksz;                        /* The size of an
 127                                                   "allocation block" */
 128        int s_quiet;                            /* Silent failure when
 129                                                   changing owner or mode? */
 130        __be32 s_type;                          /* Type for new files */
 131        __be32 s_creator;                       /* Creator for new files */
 132        umode_t s_file_umask;                   /* The umask applied to the
 133                                                   permissions on all files */
 134        umode_t s_dir_umask;                    /* The umask applied to the
 135                                                   permissions on all dirs */
 136        uid_t s_uid;                            /* The uid of all files */
 137        gid_t s_gid;                            /* The gid of all files */
 138
 139        int session, part;
 140
 141        struct nls_table *nls_io, *nls_disk;
 142
 143        struct mutex bitmap_lock;
 144
 145        unsigned long flags;
 146
 147        u16 blockoffset;
 148
 149        int fs_div;
 150
 151        struct hlist_head rsrc_inodes;
 152};
 153
 154#define HFS_FLG_BITMAP_DIRTY    0
 155#define HFS_FLG_MDB_DIRTY       1
 156#define HFS_FLG_ALT_MDB_DIRTY   2
 157
 158/* bitmap.c */
 159extern u32 hfs_vbm_search_free(struct super_block *, u32, u32 *);
 160extern int hfs_clear_vbm_bits(struct super_block *, u16, u16);
 161
 162/* catalog.c */
 163extern int hfs_cat_keycmp(const btree_key *, const btree_key *);
 164struct hfs_find_data;
 165extern int hfs_cat_find_brec(struct super_block *, u32, struct hfs_find_data *);
 166extern int hfs_cat_create(u32, struct inode *, struct qstr *, struct inode *);
 167extern int hfs_cat_delete(u32, struct inode *, struct qstr *);
 168extern int hfs_cat_move(u32, struct inode *, struct qstr *,
 169                        struct inode *, struct qstr *);
 170extern void hfs_cat_build_key(struct super_block *, btree_key *, u32, struct qstr *);
 171
 172/* dir.c */
 173extern const struct file_operations hfs_dir_operations;
 174extern const struct inode_operations hfs_dir_inode_operations;
 175
 176/* extent.c */
 177extern int hfs_ext_keycmp(const btree_key *, const btree_key *);
 178extern int hfs_free_fork(struct super_block *, struct hfs_cat_file *, int);
 179extern void hfs_ext_write_extent(struct inode *);
 180extern int hfs_extend_file(struct inode *);
 181extern void hfs_file_truncate(struct inode *);
 182
 183extern int hfs_get_block(struct inode *, sector_t, struct buffer_head *, int);
 184
 185/* inode.c */
 186extern const struct address_space_operations hfs_aops;
 187extern const struct address_space_operations hfs_btree_aops;
 188
 189extern struct inode *hfs_new_inode(struct inode *, struct qstr *, int);
 190extern void hfs_inode_write_fork(struct inode *, struct hfs_extent *, __be32 *, __be32 *);
 191extern int hfs_write_inode(struct inode *, int);
 192extern int hfs_inode_setattr(struct dentry *, struct iattr *);
 193extern void hfs_inode_read_fork(struct inode *inode, struct hfs_extent *ext,
 194                        __be32 log_size, __be32 phys_size, u32 clump_size);
 195extern struct inode *hfs_iget(struct super_block *, struct hfs_cat_key *, hfs_cat_rec *);
 196extern void hfs_clear_inode(struct inode *);
 197extern void hfs_delete_inode(struct inode *);
 198
 199/* attr.c */
 200extern int hfs_setxattr(struct dentry *dentry, const char *name,
 201                        const void *value, size_t size, int flags);
 202extern ssize_t hfs_getxattr(struct dentry *dentry, const char *name,
 203                            void *value, size_t size);
 204extern ssize_t hfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
 205
 206/* mdb.c */
 207extern int hfs_mdb_get(struct super_block *);
 208extern void hfs_mdb_commit(struct super_block *);
 209extern void hfs_mdb_close(struct super_block *);
 210extern void hfs_mdb_put(struct super_block *);
 211
 212/* part_tbl.c */
 213extern int hfs_part_find(struct super_block *, sector_t *, sector_t *);
 214
 215/* string.c */
 216extern const struct dentry_operations hfs_dentry_operations;
 217
 218extern int hfs_hash_dentry(struct dentry *, struct qstr *);
 219extern int hfs_strcmp(const unsigned char *, unsigned int,
 220                      const unsigned char *, unsigned int);
 221extern int hfs_compare_dentry(struct dentry *, struct qstr *, struct qstr *);
 222
 223/* trans.c */
 224extern void hfs_asc2mac(struct super_block *, struct hfs_name *, struct qstr *);
 225extern int hfs_mac2asc(struct super_block *, char *, const struct hfs_name *);
 226
 227extern struct timezone sys_tz;
 228
 229/*
 230 * There are two time systems.  Both are based on seconds since
 231 * a particular time/date.
 232 *      Unix:   unsigned lil-endian since 00:00 GMT, Jan. 1, 1970
 233 *      mac:    unsigned big-endian since 00:00 GMT, Jan. 1, 1904
 234 *
 235 */
 236#define __hfs_u_to_mtime(sec)   cpu_to_be32(sec + 2082844800U - sys_tz.tz_minuteswest * 60)
 237#define __hfs_m_to_utime(sec)   (be32_to_cpu(sec) - 2082844800U  + sys_tz.tz_minuteswest * 60)
 238
 239#define HFS_I(inode)    (list_entry(inode, struct hfs_inode_info, vfs_inode))
 240#define HFS_SB(sb)      ((struct hfs_sb_info *)(sb)->s_fs_info)
 241
 242#define hfs_m_to_utime(time)    (struct timespec){ .tv_sec = __hfs_m_to_utime(time) }
 243#define hfs_u_to_mtime(time)    __hfs_u_to_mtime((time).tv_sec)
 244#define hfs_mtime()             __hfs_u_to_mtime(get_seconds())
 245
 246static inline const char *hfs_mdb_name(struct super_block *sb)
 247{
 248        return sb->s_id;
 249}
 250
 251static inline void hfs_bitmap_dirty(struct super_block *sb)
 252{
 253        set_bit(HFS_FLG_BITMAP_DIRTY, &HFS_SB(sb)->flags);
 254        sb->s_dirt = 1;
 255}
 256
 257static inline void hfs_buffer_sync(struct buffer_head *bh)
 258{
 259        while (buffer_locked(bh)) {
 260                wait_on_buffer(bh);
 261        }
 262        if (buffer_dirty(bh)) {
 263                ll_rw_block(WRITE, 1, &bh);
 264                wait_on_buffer(bh);
 265        }
 266}
 267
 268#define sb_bread512(sb, sec, data) ({                   \
 269        struct buffer_head *__bh;                       \
 270        sector_t __block;                               \
 271        loff_t __start;                                 \
 272        int __offset;                                   \
 273                                                        \
 274        __start = (loff_t)(sec) << HFS_SECTOR_SIZE_BITS;\
 275        __block = __start >> (sb)->s_blocksize_bits;    \
 276        __offset = __start & ((sb)->s_blocksize - 1);   \
 277        __bh = sb_bread((sb), __block);                 \
 278        if (likely(__bh != NULL))                       \
 279                data = (void *)(__bh->b_data + __offset);\
 280        else                                            \
 281                data = NULL;                            \
 282        __bh;                                           \
 283})
 284
 285#endif
 286