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