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 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 uid_t sb_uid; /* uid from mount options */ 75 gid_t sb_gid; /* gid from mount options */ 76 umode_t sb_mode; /* mode from mount options */ 77 unsigned sb_conv : 2; /* crlf->newline hackery */ 78 unsigned sb_eas : 2; /* eas: 0-ignore, 1-ro, 2-rw */ 79 unsigned sb_err : 2; /* on errs: 0-cont, 1-ro, 2-panic */ 80 unsigned sb_chk : 2; /* checks: 0-no, 1-normal, 2-strict */ 81 unsigned sb_lowercase : 1; /* downcase filenames hackery */ 82 unsigned sb_was_error : 1; /* there was an error, set dirty flag */ 83 unsigned sb_chkdsk : 2; /* chkdsk: 0-no, 1-on errs, 2-allways */ 84 unsigned char *sb_cp_table; /* code page tables: */ 85 /* 128 bytes uppercasing table & */ 86 /* 128 bytes lowercasing table */ 87 unsigned *sb_bmp_dir; /* main bitmap directory */ 88 unsigned sb_c_bitmap; /* current bitmap */ 89 unsigned sb_max_fwd_alloc; /* max forwad allocation */ 90 struct semaphore hpfs_creation_de; /* when creating dirents, nobody else 91 can alloc blocks */ 92 /*unsigned sb_mounting : 1;*/ 93 int sb_timeshift; 94 }; 95 96 /* 97 * conv= options 98 */ 99 100 #define CONV_BINARY 0 /* no conversion */ 101 #define CONV_TEXT 1 /* crlf->newline */ 102 #define CONV_AUTO 2 /* decide based on file contents */ 103 104 /* Four 512-byte buffers and the 2k block obtained by concatenating them */ 105 106 struct quad_buffer_head { 107 struct buffer_head *bh[4]; 108 void *data; 109 }; 110 111 /* The b-tree down pointer from a dir entry */ 112 113 static inline dnode_secno de_down_pointer (struct hpfs_dirent *de) 114 { 115 CHKCOND(de->down,("HPFS: de_down_pointer: !de->down\n")); 116 return *(dnode_secno *) ((void *) de + de->length - 4); 117 } 118 119 /* The first dir entry in a dnode */ 120 121 static inline struct hpfs_dirent *dnode_first_de (struct dnode *dnode) 122 { 123 return (void *) dnode->dirent; 124 } 125 126 /* The end+1 of the dir entries */ 127 128 static inline struct hpfs_dirent *dnode_end_de (struct dnode *dnode) 129 { 130 CHKCOND(dnode->first_free>=0x14 && dnode->first_free<=0xa00,("HPFS: dnode_end_de: dnode->first_free = %d\n",(int)dnode->first_free)); 131 return (void *) dnode + dnode->first_free; 132 } 133 134 /* The dir entry after dir entry de */ 135 136 static inline struct hpfs_dirent *de_next_de (struct hpfs_dirent *de) 137 { 138 CHKCOND(de->length>=0x20 && de->length<0x800,("HPFS: de_next_de: de->length = %d\n",(int)de->length)); 139 return (void *) de + de->length; 140 } 141 142 static inline struct extended_attribute *fnode_ea(struct fnode *fnode) 143 { 144 return (struct extended_attribute *)((char *)fnode + fnode->ea_offs + fnode->acl_size_s); 145 } 146 147 static inline struct extended_attribute *fnode_end_ea(struct fnode *fnode) 148 { 149 return (struct extended_attribute *)((char *)fnode + fnode->ea_offs + fnode->acl_size_s + fnode->ea_size_s); 150 } 151 152 static inline struct extended_attribute *next_ea(struct extended_attribute *ea) 153 { 154 return (struct extended_attribute *)((char *)ea + 5 + ea->namelen + ea->valuelen); 155 } 156 157 static inline secno ea_sec(struct extended_attribute *ea) 158 { 159 return *(secno *)((char *)ea + 9 + ea->namelen); 160 } 161 162 static inline secno ea_len(struct extended_attribute *ea) 163 { 164 return *(secno *)((char *)ea + 5 + ea->namelen); 165 } 166 167 static inline char *ea_data(struct extended_attribute *ea) 168 { 169 return (char *)((char *)ea + 5 + ea->namelen); 170 } 171 172 static inline unsigned de_size(int namelen, secno down_ptr) 173 { 174 return ((0x1f + namelen + 3) & ~3) + (down_ptr ? 4 : 0); 175 } 176 177 static inline void copy_de(struct hpfs_dirent *dst, struct hpfs_dirent *src) 178 { 179 int a; 180 int n; 181 if (!dst || !src) return; 182 a = dst->down; 183 n = dst->not_8x3; 184 memcpy((char *)dst + 2, (char *)src + 2, 28); 185 dst->down = a; 186 dst->not_8x3 = n; 187 } 188 189 static inline unsigned tstbits(unsigned *bmp, unsigned b, unsigned n) 190 { 191 int i; 192 if ((b >= 0x4000) || (b + n - 1 >= 0x4000)) return n; 193 if (!((bmp[(b & 0x3fff) >> 5] >> (b & 0x1f)) & 1)) return 1; 194 for (i = 1; i < n; i++) 195 if (/*b+i < 0x4000 &&*/ !((bmp[((b+i) & 0x3fff) >> 5] >> ((b+i) & 0x1f)) & 1)) 196 return i + 1; 197 return 0; 198 } 199 200 /* alloc.c */ 201 202 int hpfs_chk_sectors(struct super_block *, secno, int, char *); 203 secno hpfs_alloc_sector(struct super_block *, secno, unsigned, int, int); 204 int hpfs_alloc_if_possible(struct super_block *, secno); 205 void hpfs_free_sectors(struct super_block *, secno, unsigned); 206 int hpfs_check_free_dnodes(struct super_block *, int); 207 void hpfs_free_dnode(struct super_block *, secno); 208 struct dnode *hpfs_alloc_dnode(struct super_block *, secno, dnode_secno *, struct quad_buffer_head *, int); 209 struct fnode *hpfs_alloc_fnode(struct super_block *, secno, fnode_secno *, struct buffer_head **); 210 struct anode *hpfs_alloc_anode(struct super_block *, secno, anode_secno *, struct buffer_head **); 211 212 /* anode.c */ 213 214 secno hpfs_bplus_lookup(struct super_block *, struct inode *, struct bplus_header *, unsigned, struct buffer_head *); 215 secno hpfs_add_sector_to_btree(struct super_block *, secno, int, unsigned); 216 void hpfs_remove_btree(struct super_block *, struct bplus_header *); 217 int hpfs_ea_read(struct super_block *, secno, int, unsigned, unsigned, char *); 218 int hpfs_ea_write(struct super_block *, secno, int, unsigned, unsigned, char *); 219 void hpfs_ea_remove(struct super_block *, secno, int, unsigned); 220 void hpfs_truncate_btree(struct super_block *, secno, int, unsigned); 221 void hpfs_remove_fnode(struct super_block *, fnode_secno fno); 222 223 /* buffer.c */ 224 225 void hpfs_lock_creation(struct super_block *); 226 void hpfs_unlock_creation(struct super_block *); 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 void hpfs_set_dentry_operations(struct dentry *); 237 238 /* dir.c */ 239 240 struct dentry *hpfs_lookup(struct inode *, struct dentry *, struct nameidata *); 241 extern const struct file_operations hpfs_dir_ops; 242 243 /* dnode.c */ 244 245 void 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 *, unsigned char *, unsigned, secno); 248 int hpfs_add_dirent(struct inode *, unsigned char *, unsigned, struct hpfs_dirent *, int); 249 int hpfs_remove_dirent(struct inode *, dnode_secno, struct hpfs_dirent *, struct quad_buffer_head *, int); 250 void hpfs_count_dnodes(struct super_block *, dnode_secno, int *, int *, int *); 251 dnode_secno hpfs_de_as_down_as_possible(struct super_block *, dnode_secno dno); 252 struct hpfs_dirent *map_pos_dirent(struct inode *, loff_t *, struct quad_buffer_head *); 253 struct hpfs_dirent *map_dirent(struct inode *, dnode_secno, char *, unsigned, dnode_secno *, struct quad_buffer_head *); 254 void hpfs_remove_dtree(struct super_block *, dnode_secno); 255 struct hpfs_dirent *map_fnode_dirent(struct super_block *, fnode_secno, struct fnode *, struct quad_buffer_head *); 256 257 /* ea.c */ 258 259 void hpfs_ea_ext_remove(struct super_block *, secno, int, unsigned); 260 int hpfs_read_ea(struct super_block *, struct fnode *, char *, char *, int); 261 char *hpfs_get_ea(struct super_block *, struct fnode *, char *, int *); 262 void hpfs_set_ea(struct inode *, struct fnode *, char *, char *, int); 263 264 /* file.c */ 265 266 int hpfs_file_fsync(struct file *, struct dentry *, int); 267 extern const struct file_operations hpfs_file_ops; 268 extern const struct inode_operations hpfs_file_iops; 269 extern const struct address_space_operations hpfs_aops; 270 271 /* inode.c */ 272 273 void hpfs_init_inode(struct inode *); 274 void hpfs_read_inode(struct inode *); 275 void hpfs_write_inode(struct inode *); 276 void hpfs_write_inode_nolock(struct inode *); 277 int hpfs_setattr(struct dentry *, struct iattr *); 278 void hpfs_write_if_changed(struct inode *); 279 void hpfs_delete_inode(struct inode *); 280 281 /* map.c */ 282 283 unsigned *hpfs_map_dnode_bitmap(struct super_block *, struct quad_buffer_head *); 284 unsigned *hpfs_map_bitmap(struct super_block *, unsigned, struct quad_buffer_head *, char *); 285 char *hpfs_load_code_page(struct super_block *, secno); 286 secno *hpfs_load_bitmap_directory(struct super_block *, secno bmp); 287 struct fnode *hpfs_map_fnode(struct super_block *s, ino_t, struct buffer_head **); 288 struct anode *hpfs_map_anode(struct super_block *s, anode_secno, struct buffer_head **); 289 struct dnode *hpfs_map_dnode(struct super_block *s, dnode_secno, struct quad_buffer_head *); 290 dnode_secno hpfs_fnode_dno(struct super_block *s, ino_t ino); 291 292 /* name.c */ 293 294 unsigned char hpfs_upcase(unsigned char *, unsigned char); 295 int hpfs_chk_name(unsigned char *, unsigned *); 296 char *hpfs_translate_name(struct super_block *, unsigned char *, unsigned, int, int); 297 int hpfs_compare_names(struct super_block *, unsigned char *, unsigned, unsigned char *, unsigned, int); 298 int hpfs_is_name_long(unsigned char *, unsigned); 299 void hpfs_adjust_length(unsigned char *, unsigned *); 300 void hpfs_decide_conv(struct inode *, unsigned char *, unsigned); 301 302 /* namei.c */ 303 304 extern const struct inode_operations hpfs_dir_iops; 305 extern const struct address_space_operations hpfs_symlink_aops; 306 307 static inline struct hpfs_inode_info *hpfs_i(struct inode *inode) 308 { 309 return list_entry(inode, struct hpfs_inode_info, vfs_inode); 310 } 311 312 static inline struct hpfs_sb_info *hpfs_sb(struct super_block *sb) 313 { 314 return sb->s_fs_info; 315 } 316 317 /* super.c */ 318 319 void hpfs_error(struct super_block *, const char *, ...) 320 __attribute__((format (printf, 2, 3))); 321 int hpfs_stop_cycles(struct super_block *, int, int *, int *, char *); 322 unsigned hpfs_count_one_bitmap(struct super_block *, secno); 323 324 /* 325 * local time (HPFS) to GMT (Unix) 326 */ 327 328 static inline time_t local_to_gmt(struct super_block *s, time32_t t) 329 { 330 extern struct timezone sys_tz; 331 return t + sys_tz.tz_minuteswest * 60 + hpfs_sb(s)->sb_timeshift; 332 } 333 334 static inline time32_t gmt_to_local(struct super_block *s, time_t t) 335 { 336 extern struct timezone sys_tz; 337 return t - sys_tz.tz_minuteswest * 60 - hpfs_sb(s)->sb_timeshift; 338 } 339