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