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