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/version.h>
  13 #include <linux/slab.h>
  14 #include <linux/types.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 #define hfs_warn(format, args...) printk(KERN_WARNING format , ## args)
  40 #define hfs_error(format, args...) printk(KERN_ERR format , ## args)
  41
  42 /*
  43  * struct hfs_inode_info
  44  *
  45  * The HFS-specific part of a Linux (struct inode)
  46  */
  47 struct hfs_inode_info {
  48         atomic_t opencnt;
  49
  50         unsigned int flags;
  51
  52         /* to deal with localtime ugliness */
  53         int tz_secondswest;
  54
  55         struct hfs_cat_key cat_key;
  56
  57         struct list_head open_dir_list;
  58         struct inode *rsrc_inode;
  59
  60         struct semaphore extents_lock;
  61
  62         u16 alloc_blocks, clump_blocks;
  63         sector_t fs_blocks;
  64         /* Allocation extents from catlog record or volume header */
  65         hfs_extent_rec first_extents;
  66         u16 first_blocks;
  67         hfs_extent_rec cached_extents;
  68         u16 cached_start, cached_blocks;
  69
  70         loff_t phys_size;
  71         struct inode vfs_inode;
  72 };
  73
  74 #define HFS_FLG_RSRC            0x0001
  75 #define HFS_FLG_EXT_DIRTY       0x0002
  76 #define HFS_FLG_EXT_NEW         0x0004
  77
  78 #define HFS_IS_RSRC(inode)      (HFS_I(inode)->flags & HFS_FLG_RSRC)
  79
  80 /*
  81  * struct hfs_sb_info
  82  *
  83  * The HFS-specific part of a Linux (struct super_block)
  84  */
  85 struct hfs_sb_info {
  86         struct buffer_head *mdb_bh;             /* The hfs_buffer
  87                                                    holding the real
  88                                                    superblock (aka VIB
  89                                                    or MDB) */
  90         struct hfs_mdb *mdb;
  91         struct buffer_head *alt_mdb_bh;         /* The hfs_buffer holding
  92                                                    the alternate superblock */
  93         struct hfs_mdb *alt_mdb;
  94         __be32 *bitmap;                         /* The page holding the
  95                                                    allocation bitmap */
  96         struct hfs_btree *ext_tree;                     /* Information about
  97                                                    the extents b-tree */
  98         struct hfs_btree *cat_tree;                     /* Information about
  99                                                    the catalog b-tree */
 100         u32 file_count;                         /* The number of
 101                                                    regular files in
 102                                                    the filesystem */
 103         u32 folder_count;                       /* The number of
 104                                                    directories in the
 105                                                    filesystem */
 106         u32 next_id;                            /* The next available
 107                                                    file id number */
 108         u32 clumpablks;                         /* The number of allocation
 109                                                    blocks to try to add when
 110                                                    extending a file */
 111         u32 fs_start;                           /* The first 512-byte
 112                                                    block represented
 113                                                    in the bitmap */
 114         u32 part_start;
 115         u16 root_files;                         /* The number of
 116                                                    regular
 117                                                    (non-directory)
 118                                                    files in the root
 119                                                    directory */
 120         u16 root_dirs;                          /* The number of
 121                                                    directories in the
 122                                                    root directory */
 123         u16 fs_ablocks;                         /* The number of
 124                                                    allocation blocks
 125                                                    in the filesystem */
 126         u16 free_ablocks;                       /* the number of unused
 127                                                    allocation blocks
 128                                                    in the filesystem */
 129         u32 alloc_blksz;                        /* The size of an
 130                                                    "allocation block" */
 131         int s_quiet;                            /* Silent failure when
 132                                                    changing owner or mode? */
 133         __be32 s_type;                          /* Type for new files */
 134         __be32 s_creator;                       /* Creator for new files */
 135         umode_t s_file_umask;                   /* The umask applied to the
 136                                                    permissions on all files */
 137         umode_t s_dir_umask;                    /* The umask applied to the
 138                                                    permissions on all dirs */
 139         uid_t s_uid;                            /* The uid of all files */
 140         gid_t s_gid;                            /* The gid of all files */
 141
 142         int session, part;
 143
 144         struct semaphore bitmap_lock;
 145
 146         unsigned long flags;
 147
 148         u16 blockoffset;
 149
 150         int fs_div;
 151
 152         struct hlist_head rsrc_inodes;
 153 };
 154
 155 #define HFS_FLG_BITMAP_DIRTY    0
 156 #define HFS_FLG_MDB_DIRTY       1
 157 #define HFS_FLG_ALT_MDB_DIRTY   2
 158
 159 /* bitmap.c */
 160 extern u32 hfs_vbm_search_free(struct super_block *, u32, u32 *);
 161 extern int hfs_clear_vbm_bits(struct super_block *, u16, u16);
 162
 163 /* catalog.c */
 164 extern int hfs_cat_keycmp(const btree_key *, const btree_key *);
 165 struct hfs_find_data;
 166 extern int hfs_cat_find_brec(struct super_block *, u32, struct hfs_find_data *);
 167 extern int hfs_cat_create(u32, struct inode *, struct qstr *, struct inode *);
 168 extern int hfs_cat_delete(u32, struct inode *, struct qstr *);
 169 extern int hfs_cat_move(u32, struct inode *, struct qstr *,
 170                         struct inode *, struct qstr *);
 171 extern void hfs_cat_build_key(btree_key *, u32, struct qstr *);
 172
 173 /* dir.c */
 174 extern struct file_operations hfs_dir_operations;
 175 extern struct inode_operations hfs_dir_inode_operations;
 176
 177 /* extent.c */
 178 extern int hfs_ext_keycmp(const btree_key *, const btree_key *);
 179 extern int hfs_free_fork(struct super_block *, struct hfs_cat_file *, int);
 180 extern void hfs_ext_write_extent(struct inode *);
 181 extern int hfs_extend_file(struct inode *);
 182 extern void hfs_file_truncate(struct inode *);
 183
 184 extern int hfs_get_block(struct inode *, sector_t, struct buffer_head *, int);
 185
 186 /* inode.c */
 187 extern struct address_space_operations hfs_aops;
 188 extern struct address_space_operations hfs_btree_aops;
 189
 190 extern struct inode *hfs_new_inode(struct inode *, struct qstr *, int);
 191 extern void hfs_inode_write_fork(struct inode *, struct hfs_extent *, __be32 *, __be32 *);
 192 extern int hfs_write_inode(struct inode *, int);
 193 extern int hfs_inode_setattr(struct dentry *, struct iattr *);
 194 extern void hfs_inode_read_fork(struct inode *inode, struct hfs_extent *ext,
 195                         __be32 log_size, __be32 phys_size, u32 clump_size);
 196 extern struct inode *hfs_iget(struct super_block *, struct hfs_cat_key *, hfs_cat_rec *);
 197 extern void hfs_clear_inode(struct inode *);
 198 extern void hfs_delete_inode(struct inode *);
 199
 200 /* attr.c */
 201 extern int hfs_setxattr(struct dentry *dentry, const char *name,
 202                         const void *value, size_t size, int flags);
 203 extern ssize_t hfs_getxattr(struct dentry *dentry, const char *name,
 204                             void *value, size_t size);
 205 extern ssize_t hfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
 206
 207 /* mdb.c */
 208 extern int hfs_mdb_get(struct super_block *);
 209 extern void hfs_mdb_commit(struct super_block *);
 210 extern void hfs_mdb_close(struct super_block *);
 211 extern void hfs_mdb_put(struct super_block *);
 212
 213 /* part_tbl.c */
 214 extern int hfs_part_find(struct super_block *, sector_t *, sector_t *);
 215
 216 /* string.c */
 217 extern struct dentry_operations hfs_dentry_operations;
 218
 219 extern int hfs_hash_dentry(struct dentry *, struct qstr *);
 220 extern int hfs_strcmp(const unsigned char *, unsigned int,
 221                       const unsigned char *, unsigned int);
 222 extern int hfs_compare_dentry(struct dentry *, struct qstr *, struct qstr *);
 223
 224 /* trans.c */
 225 extern void hfs_triv2mac(struct hfs_name *, struct qstr *);
 226 extern int hfs_mac2triv(char *, const struct hfs_name *);
 227
 228 extern struct timezone sys_tz;
 229
 230 /*
 231  * There are two time systems.  Both are based on seconds since
 232  * a particular time/date.
 233  *      Unix:   unsigned lil-endian since 00:00 GMT, Jan. 1, 1970
 234  *      mac:    unsigned big-endian since 00:00 GMT, Jan. 1, 1904
 235  *
 236  */
 237 #define __hfs_u_to_mtime(sec)   cpu_to_be32(sec + 2082844800U - sys_tz.tz_minuteswest * 60)
 238 #define __hfs_m_to_utime(sec)   (be32_to_cpu(sec) - 2082844800U  + sys_tz.tz_minuteswest * 60)
 239
 240 #define HFS_I(inode)    (list_entry(inode, struct hfs_inode_info, vfs_inode))
 241 #define HFS_SB(sb)      ((struct hfs_sb_info *)(sb)->s_fs_info)
 242
 243 #define hfs_m_to_utime(time)    (struct timespec){ .tv_sec = __hfs_m_to_utime(time) }
 244 #define hfs_u_to_mtime(time)    __hfs_u_to_mtime((time).tv_sec)
 245 #define hfs_mtime()             __hfs_u_to_mtime(get_seconds())
 246
 247 static inline const char *hfs_mdb_name(struct super_block *sb)
 248 {
 249         return sb->s_id;
 250 }
 251
 252 static inline void hfs_bitmap_dirty(struct super_block *sb)
 253 {
 254         set_bit(HFS_FLG_BITMAP_DIRTY, &HFS_SB(sb)->flags);
 255         sb->s_dirt = 1;
 256 }
 257
 258 static inline void hfs_buffer_sync(struct buffer_head *bh)
 259 {
 260         while (buffer_locked(bh)) {
 261                 wait_on_buffer(bh);
 262         }
 263         if (buffer_dirty(bh)) {
 264                 ll_rw_block(WRITE, 1, &bh);
 265                 wait_on_buffer(bh);
 266         }
 267 }
 268
 269 #define sb_bread512(sb, sec, data) ({                   \
 270         struct buffer_head *__bh;                       \
 271         sector_t __block;                               \
 272         loff_t __start;                                 \
 273         int __offset;                                   \
 274                                                         \
 275         __start = (loff_t)(sec) << HFS_SECTOR_SIZE_BITS;\
 276         __block = __start >> (sb)->s_blocksize_bits;    \
 277         __offset = __start & ((sb)->s_blocksize - 1);   \
 278         __bh = sb_bread((sb), __block);                 \
 279         if (likely(__bh != NULL))                       \
 280                 data = (void *)(__bh->b_data + __offset);\
 281         else                                            \
 282                 data = NULL;                            \
 283         __bh;                                           \
 284 })
 285
 286 #endif