1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * linux/fs/hpfs/hpfs_fn.h 4 * 5 * Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999 6 * 7 * function headers 8 */ 9 10 //#define DBG 11 //#define DEBUG_LOCKS 12 #ifdef pr_fmt 13 #undef pr_fmt 14 #endif 15 16 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 17 18 #include <linux/mutex.h> 19 #include <linux/pagemap.h> 20 #include <linux/buffer_head.h> 21 #include <linux/slab.h> 22 #include <linux/sched/signal.h> 23 #include <linux/blkdev.h> 24 #include <asm/unaligned.h> 25 26 #include "hpfs.h" 27 28 #define EIOERROR EIO 29 #define EFSERROR EUCLEAN 30 31 #define ANODE_ALLOC_FWD 512 32 #define FNODE_ALLOC_FWD 0 33 #define ALLOC_FWD_MIN 16 34 #define ALLOC_FWD_MAX 128 35 #define ALLOC_M 1 36 #define FNODE_RD_AHEAD 16 37 #define ANODE_RD_AHEAD 0 38 #define DNODE_RD_AHEAD 72 39 #define COUNT_RD_AHEAD 62 40 41 #define FREE_DNODES_ADD 58 42 #define FREE_DNODES_DEL 29 43 44 #define CHKCOND(x,y) if (!(x)) printk y 45 46 struct hpfs_inode_info { 47 loff_t mmu_private; 48 ino_t i_parent_dir; /* (directories) gives fnode of parent dir */ 49 unsigned i_dno; /* (directories) root dnode */ 50 unsigned i_dpos; /* (directories) temp for readdir */ 51 unsigned i_dsubdno; /* (directories) temp for readdir */ 52 unsigned i_file_sec; /* (files) minimalist cache of alloc info */ 53 unsigned i_disk_sec; /* (files) minimalist cache of alloc info */ 54 unsigned i_n_secs; /* (files) minimalist cache of alloc info */ 55 unsigned i_ea_size; /* size of extended attributes */ 56 unsigned i_ea_mode : 1; /* file's permission is stored in ea */ 57 unsigned i_ea_uid : 1; /* file's uid is stored in ea */ 58 unsigned i_ea_gid : 1; /* file's gid is stored in ea */ 59 unsigned i_dirty : 1; 60 loff_t **i_rddir_off; 61 struct inode vfs_inode; 62 }; 63 64 struct hpfs_sb_info { 65 struct mutex hpfs_mutex; /* global hpfs lock */ 66 ino_t sb_root; /* inode number of root dir */ 67 unsigned sb_fs_size; /* file system size, sectors */ 68 unsigned sb_bitmaps; /* sector number of bitmap list */ 69 unsigned sb_dirband_start; /* directory band start sector */ 70 unsigned sb_dirband_size; /* directory band size, dnodes */ 71 unsigned sb_dmap; /* sector number of dnode bit map */ 72 unsigned sb_n_free; /* free blocks for statfs, or -1 */ 73 unsigned sb_n_free_dnodes; /* free dnodes for statfs, or -1 */ 74 kuid_t sb_uid; /* uid from mount options */ 75 kgid_t sb_gid; /* gid from mount options */ 76 umode_t sb_mode; /* mode from mount options */ 77 unsigned sb_eas : 2; /* eas: 0-ignore, 1-ro, 2-rw */ 78 unsigned sb_err : 2; /* on errs: 0-cont, 1-ro, 2-panic */ 79 unsigned sb_chk : 2; /* checks: 0-no, 1-normal, 2-strict */ 80 unsigned sb_lowercase : 1; /* downcase filenames hackery */ 81 unsigned sb_was_error : 1; /* there was an error, set dirty flag */ 82 unsigned sb_chkdsk : 2; /* chkdsk: 0-no, 1-on errs, 2-allways */ 83 unsigned char *sb_cp_table; /* code page tables: */ 84 /* 128 bytes uppercasing table & */ 85 /* 128 bytes lowercasing table */ 86 __le32 *sb_bmp_dir; /* main bitmap directory */ 87 unsigned sb_c_bitmap; /* current bitmap */ 88 unsigned sb_max_fwd_alloc; /* max forwad allocation */ 89 int sb_timeshift; 90 struct rcu_head rcu; 91 92 unsigned n_hotfixes; 93 secno hotfix_from[256]; 94 secno hotfix_to[256]; 95 }; 96 97 /* Four 512-byte buffers and the 2k block obtained by concatenating them */ 98 99 struct quad_buffer_head { 100 struct buffer_head *bh[4]; 101 void *data; 102 }; 103 104 /* The b-tree down pointer from a dir entry */ 105 106 static inline dnode_secno de_down_pointer (struct hpfs_dirent *de) 107 { 108 CHKCOND(de->down,("HPFS: de_down_pointer: !de->down\n")); 109 return le32_to_cpu(*(__le32 *) ((void *) de + le16_to_cpu(de->length) - 4)); 110 } 111 112 /* The first dir entry in a dnode */ 113 114 static inline struct hpfs_dirent *dnode_first_de (struct dnode *dnode) 115 { 116 return (void *) dnode->dirent; 117 } 118 119 /* The end+1 of the dir entries */ 120 121 static inline struct hpfs_dirent *dnode_end_de (struct dnode *dnode) 122 { 123 CHKCOND(le32_to_cpu(dnode->first_free)>=0x14 && le32_to_cpu(dnode->first_free)<=0xa00,("HPFS: dnode_end_de: dnode->first_free = %x\n",(unsigned)le32_to_cpu(dnode->first_free))); 124 return (void *) dnode + le32_to_cpu(dnode->first_free); 125 } 126 127 /* The dir entry after dir entry de */ 128 129 static inline struct hpfs_dirent *de_next_de (struct hpfs_dirent *de) 130 { 131 CHKCOND(le16_to_cpu(de->length)>=0x20 && le16_to_cpu(de->length)<0x800,("HPFS: de_next_de: de->length = %x\n",(unsigned)le16_to_cpu(de->length))); 132 return (void *) de + le16_to_cpu(de->length); 133 } 134 135 static inline struct extended_attribute *fnode_ea(struct fnode *fnode) 136 { 137 return (struct extended_attribute *)((char *)fnode + le16_to_cpu(fnode->ea_offs) + le16_to_cpu(fnode->acl_size_s)); 138 } 139 140 static inline struct extended_attribute *fnode_end_ea(struct fnode *fnode) 141 { 142 return (struct extended_attribute *)((char *)fnode + le16_to_cpu(fnode->ea_offs) + le16_to_cpu(fnode->acl_size_s) + le16_to_cpu(fnode->ea_size_s)); 143 } 144 145 static unsigned ea_valuelen(struct extended_attribute *ea) 146 { 147 return ea->valuelen_lo + 256 * ea->valuelen_hi; 148 } 149 150 static inline struct extended_attribute *next_ea(struct extended_attribute *ea) 151 { 152 return (struct extended_attribute *)((char *)ea + 5 + ea->namelen + ea_valuelen(ea)); 153 } 154 155 static inline secno ea_sec(struct extended_attribute *ea) 156 { 157 return le32_to_cpu(get_unaligned((__le32 *)((char *)ea + 9 + ea->namelen))); 158 } 159 160 static inline secno ea_len(struct extended_attribute *ea) 161 { 162 return le32_to_cpu(get_unaligned((__le32 *)((char *)ea + 5 + ea->namelen))); 163 } 164 165 static inline char *ea_data(struct extended_attribute *ea) 166 { 167 return (char *)((char *)ea + 5 + ea->namelen); 168 } 169 170 static inline unsigned de_size(int namelen, secno down_ptr) 171 { 172 return ((0x1f + namelen + 3) & ~3) + (down_ptr ? 4 : 0); 173 } 174 175 static inline void copy_de(struct hpfs_dirent *dst, struct hpfs_dirent *src) 176 { 177 int a; 178 int n; 179 if (!dst || !src) return; 180 a = dst->down; 181 n = dst->not_8x3; 182 memcpy((char *)dst + 2, (char *)src + 2, 28); 183 dst->down = a; 184 dst->not_8x3 = n; 185 } 186 187 static inline unsigned tstbits(__le32 *bmp, unsigned b, unsigned n) 188 { 189 int i; 190 if ((b >= 0x4000) || (b + n - 1 >= 0x4000)) return n; 191 if (!((le32_to_cpu(bmp[(b & 0x3fff) >> 5]) >> (b & 0x1f)) & 1)) return 1; 192 for (i = 1; i < n; i++) 193 if (!((le32_to_cpu(bmp[((b+i) & 0x3fff) >> 5]) >> ((b+i) & 0x1f)) & 1)) 194 return i + 1; 195 return 0; 196 } 197 198 /* alloc.c */ 199 200 int hpfs_chk_sectors(struct super_block *, secno, int, char *); 201 secno hpfs_alloc_sector(struct super_block *, secno, unsigned, int); 202 int hpfs_alloc_if_possible(struct super_block *, secno); 203 void hpfs_free_sectors(struct super_block *, secno, unsigned); 204 int hpfs_check_free_dnodes(struct super_block *, int); 205 void hpfs_free_dnode(struct super_block *, secno); 206 struct dnode *hpfs_alloc_dnode(struct super_block *, secno, dnode_secno *, struct quad_buffer_head *); 207 struct fnode *hpfs_alloc_fnode(struct super_block *, secno, fnode_secno *, struct buffer_head **); 208 struct anode *hpfs_alloc_anode(struct super_block *, secno, anode_secno *, struct buffer_head **); 209 int hpfs_trim_fs(struct super_block *, u64, u64, u64, unsigned *); 210 211 /* anode.c */ 212 213 secno hpfs_bplus_lookup(struct super_block *, struct inode *, struct bplus_header *, unsigned, struct buffer_head *); 214 secno hpfs_add_sector_to_btree(struct super_block *, secno, int, unsigned); 215 void hpfs_remove_btree(struct super_block *, struct bplus_header *); 216 int hpfs_ea_read(struct super_block *, secno, int, unsigned, unsigned, char *); 217 int hpfs_ea_write(struct super_block *, secno, int, unsigned, unsigned, const char *); 218 void hpfs_ea_remove(struct super_block *, secno, int, unsigned); 219 void hpfs_truncate_btree(struct super_block *, secno, int, unsigned); 220 void hpfs_remove_fnode(struct super_block *, fnode_secno fno); 221 222 /* buffer.c */ 223 224 secno hpfs_search_hotfix_map(struct super_block *s, secno sec); 225 unsigned hpfs_search_hotfix_map_for_range(struct super_block *s, secno sec, unsigned n); 226 void hpfs_prefetch_sectors(struct super_block *, unsigned, int); 227 void *hpfs_map_sector(struct super_block *, unsigned, struct buffer_head **, int); 228 void *hpfs_get_sector(struct super_block *, unsigned, struct buffer_head **); 229 void *hpfs_map_4sectors(struct super_block *, unsigned, struct quad_buffer_head *, int); 230 void *hpfs_get_4sectors(struct super_block *, unsigned, struct quad_buffer_head *); 231 void hpfs_brelse4(struct quad_buffer_head *); 232 void hpfs_mark_4buffers_dirty(struct quad_buffer_head *); 233 234 /* dentry.c */ 235 236 extern const struct dentry_operations hpfs_dentry_operations; 237 238 /* dir.c */ 239 240 struct dentry *hpfs_lookup(struct inode *, struct dentry *, unsigned int); 241 extern const struct file_operations hpfs_dir_ops; 242 243 /* dnode.c */ 244 245 int hpfs_add_pos(struct inode *, loff_t *); 246 void hpfs_del_pos(struct inode *, loff_t *); 247 struct hpfs_dirent *hpfs_add_de(struct super_block *, struct dnode *, 248 const unsigned char *, unsigned, secno); 249 int hpfs_add_dirent(struct inode *, const unsigned char *, unsigned, 250 struct hpfs_dirent *); 251 int hpfs_remove_dirent(struct inode *, dnode_secno, struct hpfs_dirent *, struct quad_buffer_head *, int); 252 void hpfs_count_dnodes(struct super_block *, dnode_secno, int *, int *, int *); 253 dnode_secno hpfs_de_as_down_as_possible(struct super_block *, dnode_secno dno); 254 struct hpfs_dirent *map_pos_dirent(struct inode *, loff_t *, struct quad_buffer_head *); 255 struct hpfs_dirent *map_dirent(struct inode *, dnode_secno, 256 const unsigned char *, unsigned, dnode_secno *, 257 struct quad_buffer_head *); 258 void hpfs_remove_dtree(struct super_block *, dnode_secno); 259 struct hpfs_dirent *map_fnode_dirent(struct super_block *, fnode_secno, struct fnode *, struct quad_buffer_head *); 260 261 /* ea.c */ 262 263 void hpfs_ea_ext_remove(struct super_block *, secno, int, unsigned); 264 int hpfs_read_ea(struct super_block *, struct fnode *, char *, char *, int); 265 char *hpfs_get_ea(struct super_block *, struct fnode *, char *, int *); 266 void hpfs_set_ea(struct inode *, struct fnode *, const char *, 267 const char *, int); 268 269 /* file.c */ 270 271 int hpfs_file_fsync(struct file *, loff_t, loff_t, int); 272 void hpfs_truncate(struct inode *); 273 extern const struct file_operations hpfs_file_ops; 274 extern const struct inode_operations hpfs_file_iops; 275 extern const struct address_space_operations hpfs_aops; 276 277 /* inode.c */ 278 279 void hpfs_init_inode(struct inode *); 280 void hpfs_read_inode(struct inode *); 281 void hpfs_write_inode(struct inode *); 282 void hpfs_write_inode_nolock(struct inode *); 283 int hpfs_setattr(struct dentry *, struct iattr *); 284 void hpfs_write_if_changed(struct inode *); 285 void hpfs_evict_inode(struct inode *); 286 287 /* map.c */ 288 289 __le32 *hpfs_map_dnode_bitmap(struct super_block *, struct quad_buffer_head *); 290 __le32 *hpfs_map_bitmap(struct super_block *, unsigned, struct quad_buffer_head *, char *); 291 void hpfs_prefetch_bitmap(struct super_block *, unsigned); 292 unsigned char *hpfs_load_code_page(struct super_block *, secno); 293 __le32 *hpfs_load_bitmap_directory(struct super_block *, secno bmp); 294 void hpfs_load_hotfix_map(struct super_block *s, struct hpfs_spare_block *spareblock); 295 struct fnode *hpfs_map_fnode(struct super_block *s, ino_t, struct buffer_head **); 296 struct anode *hpfs_map_anode(struct super_block *s, anode_secno, struct buffer_head **); 297 struct dnode *hpfs_map_dnode(struct super_block *s, dnode_secno, struct quad_buffer_head *); 298 dnode_secno hpfs_fnode_dno(struct super_block *s, ino_t ino); 299 300 /* name.c */ 301 302 unsigned char hpfs_upcase(unsigned char *, unsigned char); 303 int hpfs_chk_name(const unsigned char *, unsigned *); 304 unsigned char *hpfs_translate_name(struct super_block *, unsigned char *, unsigned, int, int); 305 int hpfs_compare_names(struct super_block *, const unsigned char *, unsigned, 306 const unsigned char *, unsigned, int); 307 int hpfs_is_name_long(const unsigned char *, unsigned); 308 void hpfs_adjust_length(const unsigned char *, unsigned *); 309 310 /* namei.c */ 311 312 extern const struct inode_operations hpfs_dir_iops; 313 extern const struct address_space_operations hpfs_symlink_aops; 314 315 static inline struct hpfs_inode_info *hpfs_i(struct inode *inode) 316 { 317 return container_of(inode, struct hpfs_inode_info, vfs_inode); 318 } 319 320 static inline struct hpfs_sb_info *hpfs_sb(struct super_block *sb) 321 { 322 return sb->s_fs_info; 323 } 324 325 /* super.c */ 326 327 __printf(2, 3) 328 void hpfs_error(struct super_block *, const char *, ...); 329 int hpfs_stop_cycles(struct super_block *, int, int *, int *, char *); 330 unsigned hpfs_get_free_dnodes(struct super_block *); 331 long hpfs_ioctl(struct file *file, unsigned cmd, unsigned long arg); 332 333 /* 334 * local time (HPFS) to GMT (Unix) 335 */ 336 337 static inline time64_t local_to_gmt(struct super_block *s, time32_t t) 338 { 339 extern struct timezone sys_tz; 340 return t + sys_tz.tz_minuteswest * 60 + hpfs_sb(s)->sb_timeshift; 341 } 342 343 static inline time32_t gmt_to_local(struct super_block *s, time64_t t) 344 { 345 extern struct timezone sys_tz; 346 t = t - sys_tz.tz_minuteswest * 60 - hpfs_sb(s)->sb_timeshift; 347 348 return clamp_t(time64_t, t, 0, U32_MAX); 349 } 350 351 static inline time32_t local_get_seconds(struct super_block *s) 352 { 353 return gmt_to_local(s, ktime_get_real_seconds()); 354 } 355 356 /* 357 * Locking: 358 * 359 * hpfs_lock() locks the whole filesystem. It must be taken 360 * on any method called by the VFS. 361 * 362 * We don't do any per-file locking anymore, it is hard to 363 * review and HPFS is not performance-sensitive anyway. 364 */ 365 static inline void hpfs_lock(struct super_block *s) 366 { 367 struct hpfs_sb_info *sbi = hpfs_sb(s); 368 mutex_lock(&sbi->hpfs_mutex); 369 } 370 371 static inline void hpfs_unlock(struct super_block *s) 372 { 373 struct hpfs_sb_info *sbi = hpfs_sb(s); 374 mutex_unlock(&sbi->hpfs_mutex); 375 } 376 377 static inline void hpfs_lock_assert(struct super_block *s) 378 { 379 struct hpfs_sb_info *sbi = hpfs_sb(s); 380 WARN_ON(!mutex_is_locked(&sbi->hpfs_mutex)); 381 } 382