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