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 #include <linux/workqueue.h> 18 19 #include <asm/byteorder.h> 20 #include <linux/uaccess.h> 21 22 #include "hfs.h" 23 24 /* 25 * struct hfs_inode_info 26 * 27 * The HFS-specific part of a Linux (struct inode) 28 */ 29 struct hfs_inode_info { 30 atomic_t opencnt; 31 32 unsigned int flags; 33 34 /* to deal with localtime ugliness */ 35 int tz_secondswest; 36 37 struct hfs_cat_key cat_key; 38 39 struct list_head open_dir_list; 40 spinlock_t open_dir_lock; 41 struct inode *rsrc_inode; 42 43 struct mutex extents_lock; 44 45 u16 alloc_blocks, clump_blocks; 46 sector_t fs_blocks; 47 /* Allocation extents from catlog record or volume header */ 48 hfs_extent_rec first_extents; 49 u16 first_blocks; 50 hfs_extent_rec cached_extents; 51 u16 cached_start, cached_blocks; 52 53 loff_t phys_size; 54 struct inode vfs_inode; 55 }; 56 57 #define HFS_FLG_RSRC 0x0001 58 #define HFS_FLG_EXT_DIRTY 0x0002 59 #define HFS_FLG_EXT_NEW 0x0004 60 61 #define HFS_IS_RSRC(inode) (HFS_I(inode)->flags & HFS_FLG_RSRC) 62 63 /* 64 * struct hfs_sb_info 65 * 66 * The HFS-specific part of a Linux (struct super_block) 67 */ 68 struct hfs_sb_info { 69 struct buffer_head *mdb_bh; /* The hfs_buffer 70 holding the real 71 superblock (aka VIB 72 or MDB) */ 73 struct hfs_mdb *mdb; 74 struct buffer_head *alt_mdb_bh; /* The hfs_buffer holding 75 the alternate superblock */ 76 struct hfs_mdb *alt_mdb; 77 __be32 *bitmap; /* The page holding the 78 allocation bitmap */ 79 struct hfs_btree *ext_tree; /* Information about 80 the extents b-tree */ 81 struct hfs_btree *cat_tree; /* Information about 82 the catalog b-tree */ 83 atomic64_t file_count; /* The number of 84 regular files in 85 the filesystem */ 86 atomic64_t folder_count; /* The number of 87 directories in the 88 filesystem */ 89 atomic64_t next_id; /* The next available 90 file id number */ 91 u32 clumpablks; /* The number of allocation 92 blocks to try to add when 93 extending a file */ 94 u32 fs_start; /* The first 512-byte 95 block represented 96 in the bitmap */ 97 u32 part_start; 98 u16 root_files; /* The number of 99 regular 100 (non-directory) 101 files in the root 102 directory */ 103 u16 root_dirs; /* The number of 104 directories in the 105 root directory */ 106 u16 fs_ablocks; /* The number of 107 allocation blocks 108 in the filesystem */ 109 u16 free_ablocks; /* the number of unused 110 allocation blocks 111 in the filesystem */ 112 u32 alloc_blksz; /* The size of an 113 "allocation block" */ 114 int s_quiet; /* Silent failure when 115 changing owner or mode? */ 116 __be32 s_type; /* Type for new files */ 117 __be32 s_creator; /* Creator for new files */ 118 umode_t s_file_umask; /* The umask applied to the 119 permissions on all files */ 120 umode_t s_dir_umask; /* The umask applied to the 121 permissions on all dirs */ 122 kuid_t s_uid; /* The uid of all files */ 123 kgid_t s_gid; /* The gid of all files */ 124 125 int session, part; 126 struct nls_table *nls_io, *nls_disk; 127 struct mutex bitmap_lock; 128 unsigned long flags; 129 u16 blockoffset; 130 int fs_div; 131 struct super_block *sb; 132 int work_queued; /* non-zero delayed work is queued */ 133 struct delayed_work mdb_work; /* MDB flush delayed work */ 134 spinlock_t work_lock; /* protects mdb_work and work_queued */ 135 }; 136 137 #define HFS_FLG_BITMAP_DIRTY 0 138 #define HFS_FLG_MDB_DIRTY 1 139 #define HFS_FLG_ALT_MDB_DIRTY 2 140 141 /* bitmap.c */ 142 extern u32 hfs_vbm_search_free(struct super_block *sb, u32 goal, u32 *num_bits); 143 extern int hfs_clear_vbm_bits(struct super_block *sb, u16 start, u16 count); 144 145 /* catalog.c */ 146 extern int hfs_cat_keycmp(const btree_key *key1, const btree_key *key2); 147 struct hfs_find_data; 148 extern int hfs_cat_find_brec(struct super_block *sb, u32 cnid, 149 struct hfs_find_data *fd); 150 extern int hfs_cat_create(u32 cnid, struct inode *dir, 151 const struct qstr *str, struct inode *inode); 152 extern int hfs_cat_delete(u32 cnid, struct inode *dir, const struct qstr *str); 153 extern int hfs_cat_move(u32 cnid, struct inode *src_dir, 154 const struct qstr *src_name, 155 struct inode *dst_dir, 156 const struct qstr *dst_name); 157 extern void hfs_cat_build_key(struct super_block *sb, btree_key *key, 158 u32 parent, const struct qstr *name); 159 160 /* dir.c */ 161 extern const struct file_operations hfs_dir_operations; 162 extern const struct inode_operations hfs_dir_inode_operations; 163 164 /* extent.c */ 165 extern int hfs_ext_keycmp(const btree_key *key1, const btree_key *key2); 166 extern u16 hfs_ext_find_block(struct hfs_extent *ext, u16 off); 167 extern int hfs_free_fork(struct super_block *sb, 168 struct hfs_cat_file *file, int type); 169 extern int hfs_ext_write_extent(struct inode *inode); 170 extern int hfs_extend_file(struct inode *inode); 171 extern void hfs_file_truncate(struct inode *inode); 172 173 extern int hfs_get_block(struct inode *inode, sector_t block, 174 struct buffer_head *bh_result, int create); 175 176 /* inode.c */ 177 extern const struct address_space_operations hfs_aops; 178 extern const struct address_space_operations hfs_btree_aops; 179 180 int hfs_write_begin(const struct kiocb *iocb, struct address_space *mapping, 181 loff_t pos, unsigned int len, struct folio **foliop, 182 void **fsdata); 183 extern struct inode *hfs_new_inode(struct inode *dir, const struct qstr *name, 184 umode_t mode); 185 extern void hfs_inode_write_fork(struct inode *inode, struct hfs_extent *ext, 186 __be32 *log_size, __be32 *phys_size); 187 extern int hfs_write_inode(struct inode *inode, struct writeback_control *wbc); 188 extern int hfs_inode_setattr(struct mnt_idmap *idmap, struct dentry *dentry, 189 struct iattr *attr); 190 extern void hfs_inode_read_fork(struct inode *inode, struct hfs_extent *ext, 191 __be32 __log_size, __be32 phys_size, 192 u32 clump_size); 193 extern struct inode *hfs_iget(struct super_block *sb, struct hfs_cat_key *key, 194 hfs_cat_rec *rec); 195 extern void hfs_evict_inode(struct inode *inode); 196 extern void hfs_delete_inode(struct inode *inode); 197 198 /* attr.c */ 199 extern const struct xattr_handler * const hfs_xattr_handlers[]; 200 201 /* mdb.c */ 202 extern int hfs_mdb_get(struct super_block *sb); 203 extern void hfs_mdb_commit(struct super_block *sb); 204 extern void hfs_mdb_close(struct super_block *sb); 205 extern void hfs_mdb_put(struct super_block *sb); 206 207 /* part_tbl.c */ 208 extern int hfs_part_find(struct super_block *sb, 209 sector_t *part_start, sector_t *part_size); 210 211 /* string.c */ 212 extern const struct dentry_operations hfs_dentry_operations; 213 214 extern int hfs_hash_dentry(const struct dentry *dentry, struct qstr *this); 215 extern int hfs_strcmp(const unsigned char *s1, unsigned int len1, 216 const unsigned char *s2, unsigned int len2); 217 extern int hfs_compare_dentry(const struct dentry *dentry, 218 unsigned int len, const char *str, 219 const struct qstr *name); 220 221 /* trans.c */ 222 extern void hfs_asc2mac(struct super_block *sb, 223 struct hfs_name *out, const struct qstr *in); 224 extern int hfs_mac2asc(struct super_block *sb, 225 char *out, const struct hfs_name *in); 226 227 /* super.c */ 228 extern void hfs_mark_mdb_dirty(struct super_block *sb); 229 230 /* 231 * There are two time systems. Both are based on seconds since 232 * a particular time/date. 233 * Unix: signed little-endian since 00:00 GMT, Jan. 1, 1970 234 * mac: unsigned big-endian since 00:00 GMT, Jan. 1, 1904 235 * 236 * HFS implementations are highly inconsistent, this one matches the 237 * traditional behavior of 64-bit Linux, giving the most useful 238 * time range between 1970 and 2106, by treating any on-disk timestamp 239 * under HFS_UTC_OFFSET (Jan 1 1970) as a time between 2040 and 2106. 240 */ 241 #define HFS_UTC_OFFSET 2082844800U 242 243 static inline time64_t __hfs_m_to_utime(__be32 mt) 244 { 245 time64_t ut = (u32)(be32_to_cpu(mt) - HFS_UTC_OFFSET); 246 247 return ut + sys_tz.tz_minuteswest * 60; 248 } 249 250 static inline __be32 __hfs_u_to_mtime(time64_t ut) 251 { 252 ut -= sys_tz.tz_minuteswest * 60; 253 254 return cpu_to_be32(lower_32_bits(ut) + HFS_UTC_OFFSET); 255 } 256 #define HFS_I(inode) (container_of(inode, struct hfs_inode_info, vfs_inode)) 257 #define HFS_SB(sb) ((struct hfs_sb_info *)(sb)->s_fs_info) 258 259 #define hfs_m_to_utime(time) (struct timespec64){ .tv_sec = __hfs_m_to_utime(time) } 260 #define hfs_u_to_mtime(time) __hfs_u_to_mtime((time).tv_sec) 261 #define hfs_mtime() __hfs_u_to_mtime(ktime_get_real_seconds()) 262 263 static inline const char *hfs_mdb_name(struct super_block *sb) 264 { 265 return sb->s_id; 266 } 267 268 static inline void hfs_bitmap_dirty(struct super_block *sb) 269 { 270 set_bit(HFS_FLG_BITMAP_DIRTY, &HFS_SB(sb)->flags); 271 hfs_mark_mdb_dirty(sb); 272 } 273 274 #define sb_bread512(sb, sec, data) ({ \ 275 struct buffer_head *__bh; \ 276 sector_t __block; \ 277 loff_t __start; \ 278 int __offset; \ 279 \ 280 __start = (loff_t)(sec) << HFS_SECTOR_SIZE_BITS;\ 281 __block = __start >> (sb)->s_blocksize_bits; \ 282 __offset = __start & ((sb)->s_blocksize - 1); \ 283 __bh = sb_bread((sb), __block); \ 284 if (likely(__bh != NULL)) \ 285 data = (void *)(__bh->b_data + __offset);\ 286 else \ 287 data = NULL; \ 288 __bh; \ 289 }) 290 291 #endif 292