fs/hfs/hfs_fs.h

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