kernel/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 #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, ...)                                  \
  44 do {                                                            \
  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, ...)                             \
  50 do {                                                            \
  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  */
  61 struct 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  */
  99 struct 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 */
 173 extern u32 hfs_vbm_search_free(struct super_block *, u32, u32 *);
 174 extern int hfs_clear_vbm_bits(struct super_block *, u16, u16);
 175
 176 /* catalog.c */
 177 extern int hfs_cat_keycmp(const btree_key *, const btree_key *);
 178 struct hfs_find_data;
 179 extern int hfs_cat_find_brec(struct super_block *, u32, struct hfs_find_data *);
 180 extern int hfs_cat_create(u32, struct inode *, struct qstr *, struct inode *);
 181 extern int hfs_cat_delete(u32, struct inode *, struct qstr *);
 182 extern int hfs_cat_move(u32, struct inode *, struct qstr *,
 183                         struct inode *, struct qstr *);
 184 extern void hfs_cat_build_key(struct super_block *, btree_key *, u32, struct qstr *);
 185
 186 /* dir.c */
 187 extern const struct file_operations hfs_dir_operations;
 188 extern const struct inode_operations hfs_dir_inode_operations;
 189
 190 /* extent.c */
 191 extern int hfs_ext_keycmp(const btree_key *, const btree_key *);
 192 extern int hfs_free_fork(struct super_block *, struct hfs_cat_file *, int);
 193 extern int hfs_ext_write_extent(struct inode *);
 194 extern int hfs_extend_file(struct inode *);
 195 extern void hfs_file_truncate(struct inode *);
 196
 197 extern int hfs_get_block(struct inode *, sector_t, struct buffer_head *, int);
 198
 199 /* inode.c */
 200 extern const struct address_space_operations hfs_aops;
 201 extern const struct address_space_operations hfs_btree_aops;
 202
 203 extern struct inode *hfs_new_inode(struct inode *, struct qstr *, umode_t);
 204 extern void hfs_inode_write_fork(struct inode *, struct hfs_extent *, __be32 *, __be32 *);
 205 extern int hfs_write_inode(struct inode *, struct writeback_control *);
 206 extern int hfs_inode_setattr(struct dentry *, struct iattr *);
 207 extern void hfs_inode_read_fork(struct inode *inode, struct hfs_extent *ext,
 208                         __be32 log_size, __be32 phys_size, u32 clump_size);
 209 extern struct inode *hfs_iget(struct super_block *, struct hfs_cat_key *, hfs_cat_rec *);
 210 extern void hfs_evict_inode(struct inode *);
 211 extern void hfs_delete_inode(struct inode *);
 212
 213 /* attr.c */
 214 extern int hfs_setxattr(struct dentry *dentry, const char *name,
 215                         const void *value, size_t size, int flags);
 216 extern ssize_t hfs_getxattr(struct dentry *dentry, const char *name,
 217                             void *value, size_t size);
 218 extern ssize_t hfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
 219
 220 /* mdb.c */
 221 extern int hfs_mdb_get(struct super_block *);
 222 extern void hfs_mdb_commit(struct super_block *);
 223 extern void hfs_mdb_close(struct super_block *);
 224 extern void hfs_mdb_put(struct super_block *);
 225
 226 /* part_tbl.c */
 227 extern int hfs_part_find(struct super_block *, sector_t *, sector_t *);
 228
 229 /* string.c */
 230 extern const struct dentry_operations hfs_dentry_operations;
 231
 232 extern int hfs_hash_dentry(const struct dentry *, struct qstr *);
 233 extern int hfs_strcmp(const unsigned char *, unsigned int,
 234                       const unsigned char *, unsigned int);
 235 extern 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 */
 239 extern void hfs_asc2mac(struct super_block *, struct hfs_name *, struct qstr *);
 240 extern int hfs_mac2asc(struct super_block *, char *, const struct hfs_name *);
 241
 242 /* super.c */
 243 extern 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)    (list_entry(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
 262 static inline const char *hfs_mdb_name(struct super_block *sb)
 263 {
 264         return sb->s_id;
 265 }
 266
 267 static 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