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