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
  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  */
  44 struct 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  */
  82 struct 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 */
 159 extern u32 hfs_vbm_search_free(struct super_block *, u32, u32 *);
 160 extern int hfs_clear_vbm_bits(struct super_block *, u16, u16);
 161
 162 /* catalog.c */
 163 extern int hfs_cat_keycmp(const btree_key *, const btree_key *);
 164 struct hfs_find_data;
 165 extern int hfs_cat_find_brec(struct super_block *, u32, struct hfs_find_data *);
 166 extern int hfs_cat_create(u32, struct inode *, struct qstr *, struct inode *);
 167 extern int hfs_cat_delete(u32, struct inode *, struct qstr *);
 168 extern int hfs_cat_move(u32, struct inode *, struct qstr *,
 169                         struct inode *, struct qstr *);
 170 extern void hfs_cat_build_key(struct super_block *, btree_key *, u32, struct qstr *);
 171
 172 /* dir.c */
 173 extern const struct file_operations hfs_dir_operations;
 174 extern const struct inode_operations hfs_dir_inode_operations;
 175
 176 /* extent.c */
 177 extern int hfs_ext_keycmp(const btree_key *, const btree_key *);
 178 extern int hfs_free_fork(struct super_block *, struct hfs_cat_file *, int);
 179 extern void hfs_ext_write_extent(struct inode *);
 180 extern int hfs_extend_file(struct inode *);
 181 extern void hfs_file_truncate(struct inode *);
 182
 183 extern int hfs_get_block(struct inode *, sector_t, struct buffer_head *, int);
 184
 185 /* inode.c */
 186 extern const struct address_space_operations hfs_aops;
 187 extern const struct address_space_operations hfs_btree_aops;
 188
 189 extern struct inode *hfs_new_inode(struct inode *, struct qstr *, int);
 190 extern void hfs_inode_write_fork(struct inode *, struct hfs_extent *, __be32 *, __be32 *);
 191 extern int hfs_write_inode(struct inode *, struct writeback_control *);
 192 extern int hfs_inode_setattr(struct dentry *, struct iattr *);
 193 extern void hfs_inode_read_fork(struct inode *inode, struct hfs_extent *ext,
 194                         __be32 log_size, __be32 phys_size, u32 clump_size);
 195 extern struct inode *hfs_iget(struct super_block *, struct hfs_cat_key *, hfs_cat_rec *);
 196 extern void hfs_clear_inode(struct inode *);
 197 extern void hfs_delete_inode(struct inode *);
 198
 199 /* attr.c */
 200 extern int hfs_setxattr(struct dentry *dentry, const char *name,
 201                         const void *value, size_t size, int flags);
 202 extern ssize_t hfs_getxattr(struct dentry *dentry, const char *name,
 203                             void *value, size_t size);
 204 extern ssize_t hfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
 205
 206 /* mdb.c */
 207 extern int hfs_mdb_get(struct super_block *);
 208 extern void hfs_mdb_commit(struct super_block *);
 209 extern void hfs_mdb_close(struct super_block *);
 210 extern void hfs_mdb_put(struct super_block *);
 211
 212 /* part_tbl.c */
 213 extern int hfs_part_find(struct super_block *, sector_t *, sector_t *);
 214
 215 /* string.c */
 216 extern const struct dentry_operations hfs_dentry_operations;
 217
 218 extern int hfs_hash_dentry(struct dentry *, struct qstr *);
 219 extern int hfs_strcmp(const unsigned char *, unsigned int,
 220                       const unsigned char *, unsigned int);
 221 extern int hfs_compare_dentry(struct dentry *, struct qstr *, struct qstr *);
 222
 223 /* trans.c */
 224 extern void hfs_asc2mac(struct super_block *, struct hfs_name *, struct qstr *);
 225 extern int hfs_mac2asc(struct super_block *, char *, const struct hfs_name *);
 226
 227 extern 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
 246 static inline const char *hfs_mdb_name(struct super_block *sb)
 247 {
 248         return sb->s_id;
 249 }
 250
 251 static 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
 257 static 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