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 int hfs_write_begin(struct file *file, struct address_space *mapping, 205 loff_t pos, unsigned len, struct page **pagep, void **fsdata); 206 extern struct inode *hfs_new_inode(struct inode *, const struct qstr *, umode_t); 207 extern void hfs_inode_write_fork(struct inode *, struct hfs_extent *, __be32 *, __be32 *); 208 extern int hfs_write_inode(struct inode *, struct writeback_control *); 209 extern int hfs_inode_setattr(struct mnt_idmap *, struct dentry *, 210 struct iattr *); 211 extern void hfs_inode_read_fork(struct inode *inode, struct hfs_extent *ext, 212 __be32 log_size, __be32 phys_size, u32 clump_size); 213 extern struct inode *hfs_iget(struct super_block *, struct hfs_cat_key *, hfs_cat_rec *); 214 extern void hfs_evict_inode(struct inode *); 215 extern void hfs_delete_inode(struct inode *); 216 217 /* attr.c */ 218 extern const struct xattr_handler * const hfs_xattr_handlers[]; 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 *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 *, const 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: signed little-endian since 00:00 GMT, Jan. 1, 1970 249 * mac: unsigned big-endian since 00:00 GMT, Jan. 1, 1904 250 * 251 * HFS implementations are highly inconsistent, this one matches the 252 * traditional behavior of 64-bit Linux, giving the most useful 253 * time range between 1970 and 2106, by treating any on-disk timestamp 254 * under HFS_UTC_OFFSET (Jan 1 1970) as a time between 2040 and 2106. 255 */ 256 #define HFS_UTC_OFFSET 2082844800U 257 258 static inline time64_t __hfs_m_to_utime(__be32 mt) 259 { 260 time64_t ut = (u32)(be32_to_cpu(mt) - HFS_UTC_OFFSET); 261 262 return ut + sys_tz.tz_minuteswest * 60; 263 } 264 265 static inline __be32 __hfs_u_to_mtime(time64_t ut) 266 { 267 ut -= sys_tz.tz_minuteswest * 60; 268 269 return cpu_to_be32(lower_32_bits(ut) + HFS_UTC_OFFSET); 270 } 271 #define HFS_I(inode) (container_of(inode, struct hfs_inode_info, vfs_inode)) 272 #define HFS_SB(sb) ((struct hfs_sb_info *)(sb)->s_fs_info) 273 274 #define hfs_m_to_utime(time) (struct timespec64){ .tv_sec = __hfs_m_to_utime(time) } 275 #define hfs_u_to_mtime(time) __hfs_u_to_mtime((time).tv_sec) 276 #define hfs_mtime() __hfs_u_to_mtime(ktime_get_real_seconds()) 277 278 static inline const char *hfs_mdb_name(struct super_block *sb) 279 { 280 return sb->s_id; 281 } 282 283 static inline void hfs_bitmap_dirty(struct super_block *sb) 284 { 285 set_bit(HFS_FLG_BITMAP_DIRTY, &HFS_SB(sb)->flags); 286 hfs_mark_mdb_dirty(sb); 287 } 288 289 #define sb_bread512(sb, sec, data) ({ \ 290 struct buffer_head *__bh; \ 291 sector_t __block; \ 292 loff_t __start; \ 293 int __offset; \ 294 \ 295 __start = (loff_t)(sec) << HFS_SECTOR_SIZE_BITS;\ 296 __block = __start >> (sb)->s_blocksize_bits; \ 297 __offset = __start & ((sb)->s_blocksize - 1); \ 298 __bh = sb_bread((sb), __block); \ 299 if (likely(__bh != NULL)) \ 300 data = (void *)(__bh->b_data + __offset);\ 301 else \ 302 data = NULL; \ 303 __bh; \ 304 }) 305 306 #endif 307