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/hpfs_fs.h> 16 #include <linux/slab.h> 17 #include <linux/smp_lock.h> 18 19 #include "hpfs.h" 20 21 #define EIOERROR EIO 22 #define EFSERROR EPERM 23 #define EMEMERROR ENOMEM 24 25 #define ANODE_ALLOC_FWD 512 26 #define FNODE_ALLOC_FWD 0 27 #define ALLOC_FWD_MIN 16 28 #define ALLOC_FWD_MAX 128 29 #define ALLOC_M 1 30 #define FNODE_RD_AHEAD 16 31 #define ANODE_RD_AHEAD 16 32 #define DNODE_RD_AHEAD 4 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 #ifdef DBG 40 #define PRINTK(x) printk x 41 #else 42 #undef PRINTK 43 #define PRINTK(x) 44 #endif 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_conv : 2; /* (files) crlf->newline hackery */ 57 unsigned i_ea_mode : 1; /* file's permission is stored in ea */ 58 unsigned i_ea_uid : 1; /* file's uid is stored in ea */ 59 unsigned i_ea_gid : 1; /* file's gid is stored in ea */ 60 unsigned i_dirty : 1; 61 struct mutex i_mutex; 62 struct mutex i_parent_mutex; 63 loff_t **i_rddir_off; 64 struct inode vfs_inode; 65 }; 66 67 struct hpfs_sb_info { 68 ino_t sb_root; /* inode number of root dir */ 69 unsigned sb_fs_size; /* file system size, sectors */ 70 unsigned sb_bitmaps; /* sector number of bitmap list */ 71 unsigned sb_dirband_start; /* directory band start sector */ 72 unsigned sb_dirband_size; /* directory band size, dnodes */ 73 unsigned sb_dmap; /* sector number of dnode bit map */ 74 unsigned sb_n_free; /* free blocks for statfs, or -1 */ 75 unsigned sb_n_free_dnodes; /* free dnodes for statfs, or -1 */ 76 uid_t sb_uid; /* uid from mount options */ 77 gid_t sb_gid; /* gid from mount options */ 78 umode_t sb_mode; /* mode from mount options */ 79 unsigned sb_conv : 2; /* crlf->newline hackery */ 80 unsigned sb_eas : 2; /* eas: 0-ignore, 1-ro, 2-rw */ 81 unsigned sb_err : 2; /* on errs: 0-cont, 1-ro, 2-panic */ 82 unsigned sb_chk : 2; /* checks: 0-no, 1-normal, 2-strict */ 83 unsigned sb_lowercase : 1; /* downcase filenames hackery */ 84 unsigned sb_was_error : 1; /* there was an error, set dirty flag */ 85 unsigned sb_chkdsk : 2; /* chkdsk: 0-no, 1-on errs, 2-allways */ 86 unsigned char *sb_cp_table; /* code page tables: */ 87 /* 128 bytes uppercasing table & */ 88 /* 128 bytes lowercasing table */ 89 unsigned *sb_bmp_dir; /* main bitmap directory */ 90 unsigned sb_c_bitmap; /* current bitmap */ 91 unsigned sb_max_fwd_alloc; /* max forwad allocation */ 92 struct semaphore hpfs_creation_de; /* when creating dirents, nobody else 93 can alloc blocks */ 94 /*unsigned sb_mounting : 1;*/ 95 int sb_timeshift; 96 }; 97 98 /* 99 * conv= options 100 */ 101 102 #define CONV_BINARY 0 /* no conversion */ 103 #define CONV_TEXT 1 /* crlf->newline */ 104 #define CONV_AUTO 2 /* decide based on file contents */ 105 106 /* Four 512-byte buffers and the 2k block obtained by concatenating them */ 107 108 struct quad_buffer_head { 109 struct buffer_head *bh[4]; 110 void *data; 111 }; 112 113 /* The b-tree down pointer from a dir entry */ 114 115 static inline dnode_secno de_down_pointer (struct hpfs_dirent *de) 116 { 117 CHKCOND(de->down,("HPFS: de_down_pointer: !de->down\n")); 118 return *(dnode_secno *) ((void *) de + de->length - 4); 119 } 120 121 /* The first dir entry in a dnode */ 122 123 static inline struct hpfs_dirent *dnode_first_de (struct dnode *dnode) 124 { 125 return (void *) dnode->dirent; 126 } 127 128 /* The end+1 of the dir entries */ 129 130 static inline struct hpfs_dirent *dnode_end_de (struct dnode *dnode) 131 { 132 CHKCOND(dnode->first_free>=0x14 && dnode->first_free<=0xa00,("HPFS: dnode_end_de: dnode->first_free = %d\n",(int)dnode->first_free)); 133 return (void *) dnode + dnode->first_free; 134 } 135 136 /* The dir entry after dir entry de */ 137 138 static inline struct hpfs_dirent *de_next_de (struct hpfs_dirent *de) 139 { 140 CHKCOND(de->length>=0x20 && de->length<0x800,("HPFS: de_next_de: de->length = %d\n",(int)de->length)); 141 return (void *) de + de->length; 142 } 143 144 static inline struct extended_attribute *fnode_ea(struct fnode *fnode) 145 { 146 return (struct extended_attribute *)((char *)fnode + fnode->ea_offs + fnode->acl_size_s); 147 } 148 149 static inline struct extended_attribute *fnode_end_ea(struct fnode *fnode) 150 { 151 return (struct extended_attribute *)((char *)fnode + fnode->ea_offs + fnode->acl_size_s + fnode->ea_size_s); 152 } 153 154 static inline struct extended_attribute *next_ea(struct extended_attribute *ea) 155 { 156 return (struct extended_attribute *)((char *)ea + 5 + ea->namelen + ea->valuelen); 157 } 158 159 static inline secno ea_sec(struct extended_attribute *ea) 160 { 161 return *(secno *)((char *)ea + 9 + ea->namelen); 162 } 163 164 static inline secno ea_len(struct extended_attribute *ea) 165 { 166 return *(secno *)((char *)ea + 5 + ea->namelen); 167 } 168 169 static inline char *ea_data(struct extended_attribute *ea) 170 { 171 return (char *)((char *)ea + 5 + ea->namelen); 172 } 173 174 static inline unsigned de_size(int namelen, secno down_ptr) 175 { 176 return ((0x1f + namelen + 3) & ~3) + (down_ptr ? 4 : 0); 177 } 178 179 static inline void copy_de(struct hpfs_dirent *dst, struct hpfs_dirent *src) 180 { 181 int a; 182 int n; 183 if (!dst || !src) return; 184 a = dst->down; 185 n = dst->not_8x3; 186 memcpy((char *)dst + 2, (char *)src + 2, 28); 187 dst->down = a; 188 dst->not_8x3 = n; 189 } 190 191 static inline unsigned tstbits(unsigned *bmp, unsigned b, unsigned n) 192 { 193 int i; 194 if ((b >= 0x4000) || (b + n - 1 >= 0x4000)) return n; 195 if (!((bmp[(b & 0x3fff) >> 5] >> (b & 0x1f)) & 1)) return 1; 196 for (i = 1; i < n; i++) 197 if (/*b+i < 0x4000 &&*/ !((bmp[((b+i) & 0x3fff) >> 5] >> ((b+i) & 0x1f)) & 1)) 198 return i + 1; 199 return 0; 200 } 201 202 /* alloc.c */ 203 204 int hpfs_chk_sectors(struct super_block *, secno, int, char *); 205 secno hpfs_alloc_sector(struct super_block *, secno, unsigned, int, int); 206 int hpfs_alloc_if_possible(struct super_block *, secno); 207 void hpfs_free_sectors(struct super_block *, secno, unsigned); 208 int hpfs_check_free_dnodes(struct super_block *, int); 209 void hpfs_free_dnode(struct super_block *, secno); 210 struct dnode *hpfs_alloc_dnode(struct super_block *, secno, dnode_secno *, struct quad_buffer_head *, int); 211 struct fnode *hpfs_alloc_fnode(struct super_block *, secno, fnode_secno *, struct buffer_head **); 212 struct anode *hpfs_alloc_anode(struct super_block *, secno, anode_secno *, struct buffer_head **); 213 214 /* anode.c */ 215 216 secno hpfs_bplus_lookup(struct super_block *, struct inode *, struct bplus_header *, unsigned, struct buffer_head *); 217 secno hpfs_add_sector_to_btree(struct super_block *, secno, int, unsigned); 218 void hpfs_remove_btree(struct super_block *, struct bplus_header *); 219 int hpfs_ea_read(struct super_block *, secno, int, unsigned, unsigned, char *); 220 int hpfs_ea_write(struct super_block *, secno, int, unsigned, unsigned, char *); 221 void hpfs_ea_remove(struct super_block *, secno, int, unsigned); 222 void hpfs_truncate_btree(struct super_block *, secno, int, unsigned); 223 void hpfs_remove_fnode(struct super_block *, fnode_secno fno); 224 225 /* buffer.c */ 226 227 void hpfs_lock_creation(struct super_block *); 228 void hpfs_unlock_creation(struct super_block *); 229 void *hpfs_map_sector(struct super_block *, unsigned, struct buffer_head **, int); 230 void *hpfs_get_sector(struct super_block *, unsigned, struct buffer_head **); 231 void *hpfs_map_4sectors(struct super_block *, unsigned, struct quad_buffer_head *, int); 232 void *hpfs_get_4sectors(struct super_block *, unsigned, struct quad_buffer_head *); 233 void hpfs_brelse4(struct quad_buffer_head *); 234 void hpfs_mark_4buffers_dirty(struct quad_buffer_head *); 235 236 /* dentry.c */ 237 238 void hpfs_set_dentry_operations(struct dentry *); 239 240 /* dir.c */ 241 242 struct dentry *hpfs_lookup(struct inode *, struct dentry *, struct nameidata *); 243 extern const struct file_operations hpfs_dir_ops; 244 245 /* dnode.c */ 246 247 void hpfs_add_pos(struct inode *, loff_t *); 248 void hpfs_del_pos(struct inode *, loff_t *); 249 struct hpfs_dirent *hpfs_add_de(struct super_block *, struct dnode *, unsigned char *, unsigned, secno); 250 int hpfs_add_dirent(struct inode *, unsigned char *, unsigned, struct hpfs_dirent *, int); 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, char *, unsigned, dnode_secno *, struct quad_buffer_head *); 256 void hpfs_remove_dtree(struct super_block *, dnode_secno); 257 struct hpfs_dirent *map_fnode_dirent(struct super_block *, fnode_secno, struct fnode *, struct quad_buffer_head *); 258 259 /* ea.c */ 260 261 void hpfs_ea_ext_remove(struct super_block *, secno, int, unsigned); 262 int hpfs_read_ea(struct super_block *, struct fnode *, char *, char *, int); 263 char *hpfs_get_ea(struct super_block *, struct fnode *, char *, int *); 264 void hpfs_set_ea(struct inode *, struct fnode *, char *, char *, int); 265 266 /* file.c */ 267 268 int hpfs_file_fsync(struct file *, struct dentry *, int); 269 extern const struct file_operations hpfs_file_ops; 270 extern struct inode_operations hpfs_file_iops; 271 extern struct address_space_operations hpfs_aops; 272 273 /* inode.c */ 274 275 void hpfs_init_inode(struct inode *); 276 void hpfs_read_inode(struct inode *); 277 void hpfs_write_inode(struct inode *); 278 void hpfs_write_inode_nolock(struct inode *); 279 int hpfs_notify_change(struct dentry *, struct iattr *); 280 void hpfs_write_if_changed(struct inode *); 281 void hpfs_delete_inode(struct inode *); 282 283 /* map.c */ 284 285 unsigned *hpfs_map_dnode_bitmap(struct super_block *, struct quad_buffer_head *); 286 unsigned *hpfs_map_bitmap(struct super_block *, unsigned, struct quad_buffer_head *, char *); 287 char *hpfs_load_code_page(struct super_block *, secno); 288 secno *hpfs_load_bitmap_directory(struct super_block *, secno bmp); 289 struct fnode *hpfs_map_fnode(struct super_block *s, ino_t, struct buffer_head **); 290 struct anode *hpfs_map_anode(struct super_block *s, anode_secno, struct buffer_head **); 291 struct dnode *hpfs_map_dnode(struct super_block *s, dnode_secno, struct quad_buffer_head *); 292 dnode_secno hpfs_fnode_dno(struct super_block *s, ino_t ino); 293 294 /* name.c */ 295 296 unsigned char hpfs_upcase(unsigned char *, unsigned char); 297 int hpfs_chk_name(unsigned char *, unsigned *); 298 char *hpfs_translate_name(struct super_block *, unsigned char *, unsigned, int, int); 299 int hpfs_compare_names(struct super_block *, unsigned char *, unsigned, unsigned char *, unsigned, int); 300 int hpfs_is_name_long(unsigned char *, unsigned); 301 void hpfs_adjust_length(unsigned char *, unsigned *); 302 void hpfs_decide_conv(struct inode *, unsigned char *, unsigned); 303 304 /* namei.c */ 305 306 extern struct inode_operations hpfs_dir_iops; 307 extern struct address_space_operations hpfs_symlink_aops; 308 309 static inline struct hpfs_inode_info *hpfs_i(struct inode *inode) 310 { 311 return list_entry(inode, struct hpfs_inode_info, vfs_inode); 312 } 313 314 static inline struct hpfs_sb_info *hpfs_sb(struct super_block *sb) 315 { 316 return sb->s_fs_info; 317 } 318 319 /* super.c */ 320 321 void hpfs_error(struct super_block *, char *, ...); 322 int hpfs_stop_cycles(struct super_block *, int, int *, int *, char *); 323 unsigned hpfs_count_one_bitmap(struct super_block *, secno); 324 325 /* 326 * local time (HPFS) to GMT (Unix) 327 */ 328 329 static inline time_t local_to_gmt(struct super_block *s, time32_t t) 330 { 331 extern struct timezone sys_tz; 332 return t + sys_tz.tz_minuteswest * 60 + hpfs_sb(s)->sb_timeshift; 333 } 334 335 static inline time32_t gmt_to_local(struct super_block *s, time_t t) 336 { 337 extern struct timezone sys_tz; 338 return t - sys_tz.tz_minuteswest * 60 - hpfs_sb(s)->sb_timeshift; 339 } 340