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 <linux/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         spinlock_t open_dir_lock;
  73         struct inode *rsrc_inode;
  74
  75         struct mutex extents_lock;
  76
  77         u16 alloc_blocks, clump_blocks;
  78         sector_t fs_blocks;
  79         /* Allocation extents from catlog record or volume header */
  80         hfs_extent_rec first_extents;
  81         u16 first_blocks;
  82         hfs_extent_rec cached_extents;
  83         u16 cached_start, cached_blocks;
  84
  85         loff_t phys_size;
  86         struct inode vfs_inode;
  87 };
  88
  89 #define HFS_FLG_RSRC            0x0001
  90 #define HFS_FLG_EXT_DIRTY       0x0002
  91 #define HFS_FLG_EXT_NEW         0x0004
  92
  93 #define HFS_IS_RSRC(inode)      (HFS_I(inode)->flags & HFS_FLG_RSRC)
  94
  95 /*
  96  * struct hfs_sb_info
  97  *
  98  * The HFS-specific part of a Linux (struct super_block)
  99  */
 100 struct hfs_sb_info {
 101         struct buffer_head *mdb_bh;             /* The hfs_buffer
 102                                                    holding the real
 103                                                    superblock (aka VIB
 104                                                    or MDB) */
 105         struct hfs_mdb *mdb;
 106         struct buffer_head *alt_mdb_bh;         /* The hfs_buffer holding
 107                                                    the alternate superblock */
 108         struct hfs_mdb *alt_mdb;
 109         __be32 *bitmap;                         /* The page holding the
 110                                                    allocation bitmap */
 111         struct hfs_btree *ext_tree;                     /* Information about
 112                                                    the extents b-tree */
 113         struct hfs_btree *cat_tree;                     /* Information about
 114                                                    the catalog b-tree */
 115         u32 file_count;                         /* The number of
 116                                                    regular files in
 117                                                    the filesystem */
 118         u32 folder_count;                       /* The number of
 119                                                    directories in the
 120                                                    filesystem */
 121         u32 next_id;                            /* The next available
 122                                                    file id number */
 123         u32 clumpablks;                         /* The number of allocation
 124                                                    blocks to try to add when
 125                                                    extending a file */
 126         u32 fs_start;                           /* The first 512-byte
 127                                                    block represented
 128                                                    in the bitmap */
 129         u32 part_start;
 130         u16 root_files;                         /* The number of
 131                                                    regular
 132                                                    (non-directory)
 133                                                    files in the root
 134                                                    directory */
 135         u16 root_dirs;                          /* The number of
 136                                                    directories in the
 137                                                    root directory */
 138         u16 fs_ablocks;                         /* The number of
 139                                                    allocation blocks
 140                                                    in the filesystem */
 141         u16 free_ablocks;                       /* the number of unused
 142                                                    allocation blocks
 143                                                    in the filesystem */
 144         u32 alloc_blksz;                        /* The size of an
 145                                                    "allocation block" */
 146         int s_quiet;                            /* Silent failure when
 147                                                    changing owner or mode? */
 148         __be32 s_type;                          /* Type for new files */
 149         __be32 s_creator;                       /* Creator for new files */
 150         umode_t s_file_umask;                   /* The umask applied to the
 151                                                    permissions on all files */
 152         umode_t s_dir_umask;                    /* The umask applied to the
 153                                                    permissions on all dirs */
 154         kuid_t s_uid;                           /* The uid of all files */
 155         kgid_t s_gid;                           /* The gid of all files */
 156
 157         int session, part;
 158         struct nls_table *nls_io, *nls_disk;
 159         struct mutex bitmap_lock;
 160         unsigned long flags;
 161         u16 blockoffset;
 162         int fs_div;
 163         struct super_block *sb;
 164         int work_queued;                /* non-zero delayed work is queued */
 165         struct delayed_work mdb_work;   /* MDB flush delayed work */
 166         spinlock_t work_lock;           /* protects mdb_work and work_queued */
 167 };
 168
 169 #define HFS_FLG_BITMAP_DIRTY    0
 170 #define HFS_FLG_MDB_DIRTY       1
 171 #define HFS_FLG_ALT_MDB_DIRTY   2
 172
 173 /* bitmap.c */
 174 extern u32 hfs_vbm_search_free(struct super_block *, u32, u32 *);
 175 extern int hfs_clear_vbm_bits(struct super_block *, u16, u16);
 176
 177 /* catalog.c */
 178 extern int hfs_cat_keycmp(const btree_key *, const btree_key *);
 179 struct hfs_find_data;
 180 extern int hfs_cat_find_brec(struct super_block *, u32, struct hfs_find_data *);
 181 extern int hfs_cat_create(u32, struct inode *, const struct qstr *, struct inode *);
 182 extern int hfs_cat_delete(u32, struct inode *, const struct qstr *);
 183 extern int hfs_cat_move(u32, struct inode *, const struct qstr *,
 184                         struct inode *, const struct qstr *);
 185 extern void hfs_cat_build_key(struct super_block *, btree_key *, u32, const struct qstr *);
 186
 187 /* dir.c */
 188 extern const struct file_operations hfs_dir_operations;
 189 extern const struct inode_operations hfs_dir_inode_operations;
 190
 191 /* extent.c */
 192 extern int hfs_ext_keycmp(const btree_key *, const btree_key *);
 193 extern int hfs_free_fork(struct super_block *, struct hfs_cat_file *, int);
 194 extern int hfs_ext_write_extent(struct inode *);
 195 extern int hfs_extend_file(struct inode *);
 196 extern void hfs_file_truncate(struct inode *);
 197
 198 extern int hfs_get_block(struct inode *, sector_t, struct buffer_head *, int);
 199
 200 /* inode.c */
 201 extern const struct address_space_operations hfs_aops;
 202 extern const struct address_space_operations hfs_btree_aops;
 203
 204 extern struct inode *hfs_new_inode(struct inode *, const struct qstr *, umode_t);
 205 extern void hfs_inode_write_fork(struct inode *, struct hfs_extent *, __be32 *, __be32 *);
 206 extern int hfs_write_inode(struct inode *, struct writeback_control *);
 207 extern int hfs_inode_setattr(struct dentry *, struct iattr *);
 208 extern void hfs_inode_read_fork(struct inode *inode, struct hfs_extent *ext,
 209                         __be32 log_size, __be32 phys_size, u32 clump_size);
 210 extern struct inode *hfs_iget(struct super_block *, struct hfs_cat_key *, hfs_cat_rec *);
 211 extern void hfs_evict_inode(struct inode *);
 212 extern void hfs_delete_inode(struct inode *);
 213
 214 /* attr.c */
 215 extern const struct xattr_handler *hfs_xattr_handlers[];
 216
 217 /* mdb.c */
 218 extern int hfs_mdb_get(struct super_block *);
 219 extern void hfs_mdb_commit(struct super_block *);
 220 extern void hfs_mdb_close(struct super_block *);
 221 extern void hfs_mdb_put(struct super_block *);
 222
 223 /* part_tbl.c */
 224 extern int hfs_part_find(struct super_block *, sector_t *, sector_t *);
 225
 226 /* string.c */
 227 extern const struct dentry_operations hfs_dentry_operations;
 228
 229 extern int hfs_hash_dentry(const struct dentry *, struct qstr *);
 230 extern int hfs_strcmp(const unsigned char *, unsigned int,
 231                       const unsigned char *, unsigned int);
 232 extern int hfs_compare_dentry(const struct dentry *dentry,
 233                 unsigned int len, const char *str, const struct qstr *name);
 234
 235 /* trans.c */
 236 extern void hfs_asc2mac(struct super_block *, struct hfs_name *, const struct qstr *);
 237 extern int hfs_mac2asc(struct super_block *, char *, const struct hfs_name *);
 238
 239 /* super.c */
 240 extern void hfs_mark_mdb_dirty(struct super_block *sb);
 241
 242 /*
 243  * There are two time systems.  Both are based on seconds since
 244  * a particular time/date.
 245  *      Unix:   signed little-endian since 00:00 GMT, Jan. 1, 1970
 246  *      mac:    unsigned big-endian since 00:00 GMT, Jan. 1, 1904
 247  *
 248  * HFS implementations are highly inconsistent, this one matches the
 249  * traditional behavior of 64-bit Linux, giving the most useful
 250  * time range between 1970 and 2106, by treating any on-disk timestamp
 251  * under HFS_UTC_OFFSET (Jan 1 1970) as a time between 2040 and 2106.
 252  */
 253 #define HFS_UTC_OFFSET 2082844800U
 254
 255 static inline time64_t __hfs_m_to_utime(__be32 mt)
 256 {
 257         time64_t ut = (u32)(be32_to_cpu(mt) - HFS_UTC_OFFSET);
 258
 259         return ut + sys_tz.tz_minuteswest * 60;
 260 }
 261
 262 static inline __be32 __hfs_u_to_mtime(time64_t ut)
 263 {
 264         ut -= sys_tz.tz_minuteswest * 60;
 265
 266         return cpu_to_be32(lower_32_bits(ut) + HFS_UTC_OFFSET);
 267 }
 268 #define HFS_I(inode)    (container_of(inode, struct hfs_inode_info, vfs_inode))
 269 #define HFS_SB(sb)      ((struct hfs_sb_info *)(sb)->s_fs_info)
 270
 271 #define hfs_m_to_utime(time)   (struct timespec64){ .tv_sec = __hfs_m_to_utime(time) }
 272 #define hfs_u_to_mtime(time)   __hfs_u_to_mtime((time).tv_sec)
 273 #define hfs_mtime()             __hfs_u_to_mtime(ktime_get_real_seconds())
 274
 275 static inline const char *hfs_mdb_name(struct super_block *sb)
 276 {
 277         return sb->s_id;
 278 }
 279
 280 static inline void hfs_bitmap_dirty(struct super_block *sb)
 281 {
 282         set_bit(HFS_FLG_BITMAP_DIRTY, &HFS_SB(sb)->flags);
 283         hfs_mark_mdb_dirty(sb);
 284 }
 285
 286 #define sb_bread512(sb, sec, data) ({                   \
 287         struct buffer_head *__bh;                       \
 288         sector_t __block;                               \
 289         loff_t __start;                                 \
 290         int __offset;                                   \
 291                                                         \
 292         __start = (loff_t)(sec) << HFS_SECTOR_SIZE_BITS;\
 293         __block = __start >> (sb)->s_blocksize_bits;    \
 294         __offset = __start & ((sb)->s_blocksize - 1);   \
 295         __bh = sb_bread((sb), __block);                 \
 296         if (likely(__bh != NULL))                       \
 297                 data = (void *)(__bh->b_data + __offset);\
 298         else                                            \
 299                 data = NULL;                            \
 300         __bh;                                           \
 301 })
 302
 303 #endif