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#ifdef pr_fmt
  13#undef pr_fmt
  14#endif
  15
  16#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  17
  18#include <linux/slab.h>
  19#include <linux/types.h>
  20#include <linux/mutex.h>
  21#include <linux/buffer_head.h>
  22#include <linux/fs.h>
  23#include <linux/workqueue.h>
  24
  25#include <asm/byteorder.h>
  26#include <asm/uaccess.h>
  27
  28#include "hfs.h"
  29
  30#define DBG_BNODE_REFS  0x00000001
  31#define DBG_BNODE_MOD   0x00000002
  32#define DBG_CAT_MOD     0x00000004
  33#define DBG_INODE       0x00000008
  34#define DBG_SUPER       0x00000010
  35#define DBG_EXTENT      0x00000020
  36#define DBG_BITMAP      0x00000040
  37
  38//#define DBG_MASK      (DBG_EXTENT|DBG_INODE|DBG_BNODE_MOD|DBG_CAT_MOD|DBG_BITMAP)
  39//#define DBG_MASK      (DBG_BNODE_MOD|DBG_CAT_MOD|DBG_INODE)
  40//#define DBG_MASK      (DBG_CAT_MOD|DBG_BNODE_REFS|DBG_INODE|DBG_EXTENT)
  41#define DBG_MASK        (0)
  42
  43#define hfs_dbg(flg, fmt, ...)                                  \
  44do {                                                            \
  45        if (DBG_##flg & DBG_MASK)                               \
  46                printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__);  \
  47} while (0)
  48
  49#define hfs_dbg_cont(flg, fmt, ...)                             \
  50do {                                                            \
  51        if (DBG_##flg & DBG_MASK)                               \
  52                pr_cont(fmt, ##__VA_ARGS__);                    \
  53} while (0)
  54
  55
  56/*
  57 * struct hfs_inode_info
  58 *
  59 * The HFS-specific part of a Linux (struct inode)
  60 */
  61struct hfs_inode_info {
  62        atomic_t opencnt;
  63
  64        unsigned int flags;
  65
  66        /* to deal with localtime ugliness */
  67        int tz_secondswest;
  68
  69        struct hfs_cat_key cat_key;
  70
  71        struct list_head open_dir_list;
  72        struct inode *rsrc_inode;
  73
  74        struct mutex extents_lock;
  75
  76        u16 alloc_blocks, clump_blocks;
  77        sector_t fs_blocks;
  78        /* Allocation extents from catlog record or volume header */
  79        hfs_extent_rec first_extents;
  80        u16 first_blocks;
  81        hfs_extent_rec cached_extents;
  82        u16 cached_start, cached_blocks;
  83
  84        loff_t phys_size;
  85        struct inode vfs_inode;
  86};
  87
  88#define HFS_FLG_RSRC            0x0001
  89#define HFS_FLG_EXT_DIRTY       0x0002
  90#define HFS_FLG_EXT_NEW         0x0004
  91
  92#define HFS_IS_RSRC(inode)      (HFS_I(inode)->flags & HFS_FLG_RSRC)
  93
  94/*
  95 * struct hfs_sb_info
  96 *
  97 * The HFS-specific part of a Linux (struct super_block)
  98 */
  99struct hfs_sb_info {
 100        struct buffer_head *mdb_bh;             /* The hfs_buffer
 101                                                   holding the real
 102                                                   superblock (aka VIB
 103                                                   or MDB) */
 104        struct hfs_mdb *mdb;
 105        struct buffer_head *alt_mdb_bh;         /* The hfs_buffer holding
 106                                                   the alternate superblock */
 107        struct hfs_mdb *alt_mdb;
 108        __be32 *bitmap;                         /* The page holding the
 109                                                   allocation bitmap */
 110        struct hfs_btree *ext_tree;                     /* Information about
 111                                                   the extents b-tree */
 112        struct hfs_btree *cat_tree;                     /* Information about
 113                                                   the catalog b-tree */
 114        u32 file_count;                         /* The number of
 115                                                   regular files in
 116                                                   the filesystem */
 117        u32 folder_count;                       /* The number of
 118                                                   directories in the
 119                                                   filesystem */
 120        u32 next_id;                            /* The next available
 121                                                   file id number */
 122        u32 clumpablks;                         /* The number of allocation
 123                                                   blocks to try to add when
 124                                                   extending a file */
 125        u32 fs_start;                           /* The first 512-byte
 126                                                   block represented
 127                                                   in the bitmap */
 128        u32 part_start;
 129        u16 root_files;                         /* The number of
 130                                                   regular
 131                                                   (non-directory)
 132                                                   files in the root
 133                                                   directory */
 134        u16 root_dirs;                          /* The number of
 135                                                   directories in the
 136                                                   root directory */
 137        u16 fs_ablocks;                         /* The number of
 138                                                   allocation blocks
 139                                                   in the filesystem */
 140        u16 free_ablocks;                       /* the number of unused
 141                                                   allocation blocks
 142                                                   in the filesystem */
 143        u32 alloc_blksz;                        /* The size of an
 144                                                   "allocation block" */
 145        int s_quiet;                            /* Silent failure when
 146                                                   changing owner or mode? */
 147        __be32 s_type;                          /* Type for new files */
 148        __be32 s_creator;                       /* Creator for new files */
 149        umode_t s_file_umask;                   /* The umask applied to the
 150                                                   permissions on all files */
 151        umode_t s_dir_umask;                    /* The umask applied to the
 152                                                   permissions on all dirs */
 153        kuid_t s_uid;                           /* The uid of all files */
 154        kgid_t s_gid;                           /* The gid of all files */
 155
 156        int session, part;
 157        struct nls_table *nls_io, *nls_disk;
 158        struct mutex bitmap_lock;
 159        unsigned long flags;
 160        u16 blockoffset;
 161        int fs_div;
 162        struct super_block *sb;
 163        int work_queued;                /* non-zero delayed work is queued */
 164        struct delayed_work mdb_work;   /* MDB flush delayed work */
 165        spinlock_t work_lock;           /* protects mdb_work and work_queued */
 166};
 167
 168#define HFS_FLG_BITMAP_DIRTY    0
 169#define HFS_FLG_MDB_DIRTY       1
 170#define HFS_FLG_ALT_MDB_DIRTY   2
 171
 172/* bitmap.c */
 173extern u32 hfs_vbm_search_free(struct super_block *, u32, u32 *);
 174extern int hfs_clear_vbm_bits(struct super_block *, u16, u16);
 175
 176/* catalog.c */
 177extern int hfs_cat_keycmp(const btree_key *, const btree_key *);
 178struct hfs_find_data;
 179extern int hfs_cat_find_brec(struct super_block *, u32, struct hfs_find_data *);
 180extern int hfs_cat_create(u32, struct inode *, struct qstr *, struct inode *);
 181extern int hfs_cat_delete(u32, struct inode *, struct qstr *);
 182extern int hfs_cat_move(u32, struct inode *, struct qstr *,
 183                        struct inode *, struct qstr *);
 184extern void hfs_cat_build_key(struct super_block *, btree_key *, u32, struct qstr *);
 185
 186/* dir.c */
 187extern const struct file_operations hfs_dir_operations;
 188extern const struct inode_operations hfs_dir_inode_operations;
 189
 190/* extent.c */
 191extern int hfs_ext_keycmp(const btree_key *, const btree_key *);
 192extern int hfs_free_fork(struct super_block *, struct hfs_cat_file *, int);
 193extern int hfs_ext_write_extent(struct inode *);
 194extern int hfs_extend_file(struct inode *);
 195extern void hfs_file_truncate(struct inode *);
 196
 197extern int hfs_get_block(struct inode *, sector_t, struct buffer_head *, int);
 198
 199/* inode.c */
 200extern const struct address_space_operations hfs_aops;
 201extern const struct address_space_operations hfs_btree_aops;
 202
 203extern struct inode *hfs_new_inode(struct inode *, struct qstr *, umode_t);
 204extern void hfs_inode_write_fork(struct inode *, struct hfs_extent *, __be32 *, __be32 *);
 205extern int hfs_write_inode(struct inode *, struct writeback_control *);
 206extern int hfs_inode_setattr(struct dentry *, struct iattr *);
 207extern void hfs_inode_read_fork(struct inode *inode, struct hfs_extent *ext,
 208                        __be32 log_size, __be32 phys_size, u32 clump_size);
 209extern struct inode *hfs_iget(struct super_block *, struct hfs_cat_key *, hfs_cat_rec *);
 210extern void hfs_evict_inode(struct inode *);
 211extern void hfs_delete_inode(struct inode *);
 212
 213/* attr.c */
 214extern int hfs_setxattr(struct dentry *dentry, const char *name,
 215                        const void *value, size_t size, int flags);
 216extern ssize_t hfs_getxattr(struct dentry *dentry, const char *name,
 217                            void *value, size_t size);
 218extern ssize_t hfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
 219
 220/* mdb.c */
 221extern int hfs_mdb_get(struct super_block *);
 222extern void hfs_mdb_commit(struct super_block *);
 223extern void hfs_mdb_close(struct super_block *);
 224extern void hfs_mdb_put(struct super_block *);
 225
 226/* part_tbl.c */
 227extern int hfs_part_find(struct super_block *, sector_t *, sector_t *);
 228
 229/* string.c */
 230extern const struct dentry_operations hfs_dentry_operations;
 231
 232extern int hfs_hash_dentry(const struct dentry *, struct qstr *);
 233extern int hfs_strcmp(const unsigned char *, unsigned int,
 234                      const unsigned char *, unsigned int);
 235extern int hfs_compare_dentry(const struct dentry *parent, const struct dentry *dentry,
 236                unsigned int len, const char *str, const struct qstr *name);
 237
 238/* trans.c */
 239extern void hfs_asc2mac(struct super_block *, struct hfs_name *, struct qstr *);
 240extern int hfs_mac2asc(struct super_block *, char *, const struct hfs_name *);
 241
 242/* super.c */
 243extern void hfs_mark_mdb_dirty(struct super_block *sb);
 244
 245/*
 246 * There are two time systems.  Both are based on seconds since
 247 * a particular time/date.
 248 *      Unix:   unsigned lil-endian since 00:00 GMT, Jan. 1, 1970
 249 *      mac:    unsigned big-endian since 00:00 GMT, Jan. 1, 1904
 250 *
 251 */
 252#define __hfs_u_to_mtime(sec)   cpu_to_be32(sec + 2082844800U - sys_tz.tz_minuteswest * 60)
 253#define __hfs_m_to_utime(sec)   (be32_to_cpu(sec) - 2082844800U  + sys_tz.tz_minuteswest * 60)
 254
 255#define HFS_I(inode)    (container_of(inode, struct hfs_inode_info, vfs_inode))
 256#define HFS_SB(sb)      ((struct hfs_sb_info *)(sb)->s_fs_info)
 257
 258#define hfs_m_to_utime(time)    (struct timespec){ .tv_sec = __hfs_m_to_utime(time) }
 259#define hfs_u_to_mtime(time)    __hfs_u_to_mtime((time).tv_sec)
 260#define hfs_mtime()             __hfs_u_to_mtime(get_seconds())
 261
 262static inline const char *hfs_mdb_name(struct super_block *sb)
 263{
 264        return sb->s_id;
 265}
 266
 267static inline void hfs_bitmap_dirty(struct super_block *sb)
 268{
 269        set_bit(HFS_FLG_BITMAP_DIRTY, &HFS_SB(sb)->flags);
 270        hfs_mark_mdb_dirty(sb);
 271}
 272
 273#define sb_bread512(sb, sec, data) ({                   \
 274        struct buffer_head *__bh;                       \
 275        sector_t __block;                               \
 276        loff_t __start;                                 \
 277        int __offset;                                   \
 278                                                        \
 279        __start = (loff_t)(sec) << HFS_SECTOR_SIZE_BITS;\
 280        __block = __start >> (sb)->s_blocksize_bits;    \
 281        __offset = __start & ((sb)->s_blocksize - 1);   \
 282        __bh = sb_bread((sb), __block);                 \
 283        if (likely(__bh != NULL))                       \
 284                data = (void *)(__bh->b_data + __offset);\
 285        else                                            \
 286                data = NULL;                            \
 287        __bh;                                           \
 288})
 289
 290#endif
 291