Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/fs/hpfs/hpfs_fn.h
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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/fs.h> 13 #include <linux/hpfs_fs.h> 14 #include <linux/errno.h> 15 #include <linux/slab.h> 16 #include <linux/kernel.h> 17 #include <linux/sched.h> 18 #include <linux/locks.h> 19 #include <linux/stat.h> 20 #include <linux/string.h> 21 #include <asm/bitops.h> 22 #include <asm/segment.h> 23 #include <asm/uaccess.h> 24 #include <linux/smp_lock.h> 25 26 #include <stdarg.h> 27 28 #include "hpfs.h" 29 30 #define memcpy_tofs memcpy 31 #define memcpy_fromfs memcpy 32 33 #define EIOERROR EIO 34 #define EFSERROR EPERM 35 #define EMEMERROR ENOMEM 36 37 #define ANODE_ALLOC_FWD 512 38 #define FNODE_ALLOC_FWD 0 39 #define ALLOC_FWD_MIN 16 40 #define ALLOC_FWD_MAX 128 41 #define ALLOC_M 1 42 #define FNODE_RD_AHEAD 16 43 #define ANODE_RD_AHEAD 16 44 #define DNODE_RD_AHEAD 4 45 46 #define FREE_DNODES_ADD 58 47 #define FREE_DNODES_DEL 29 48 49 #define CHKCOND(x,y) if (!(x)) printk y 50 51 #ifdef DBG 52 #define PRINTK(x) printk x 53 #else 54 #undef PRINTK 55 #define PRINTK(x) 56 #endif 57 58 typedef void nonconst; /* What this is for ? */ 59 60 /* 61 * local time (HPFS) to GMT (Unix) 62 */ 63 64 extern inline time_t local_to_gmt(struct super_block *s, time_t t) 65 { 66 extern struct timezone sys_tz; 67 return t + sys_tz.tz_minuteswest * 60 + s->s_hpfs_timeshift; 68 } 69 70 extern inline time_t gmt_to_local(struct super_block *s, time_t t) 71 { 72 extern struct timezone sys_tz; 73 return t - sys_tz.tz_minuteswest * 60 - s->s_hpfs_timeshift; 74 } 75 76 /* 77 * conv= options 78 */ 79 80 #define CONV_BINARY 0 /* no conversion */ 81 #define CONV_TEXT 1 /* crlf->newline */ 82 #define CONV_AUTO 2 /* decide based on file contents */ 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 extern inline dnode_secno de_down_pointer (struct hpfs_dirent *de) 94 { 95 CHKCOND(de->down,("HPFS: de_down_pointer: !de->down\n")); 96 return *(dnode_secno *) ((void *) de + de->length - 4); 97 } 98 99 /* The first dir entry in a dnode */ 100 101 extern 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 extern inline struct hpfs_dirent *dnode_end_de (struct dnode *dnode) 109 { 110 CHKCOND(dnode->first_free>=0x14 && dnode->first_free<=0xa00,("HPFS: dnode_end_de: dnode->first_free = %d\n",(int)dnode->first_free)); 111 return (void *) dnode + dnode->first_free; 112 } 113 114 /* The dir entry after dir entry de */ 115 116 extern inline struct hpfs_dirent *de_next_de (struct hpfs_dirent *de) 117 { 118 CHKCOND(de->length>=0x20 && de->length<0x800,("HPFS: de_next_de: de->length = %d\n",(int)de->length)); 119 return (void *) de + de->length; 120 } 121 122 extern inline struct extended_attribute *fnode_ea(struct fnode *fnode) 123 { 124 return (struct extended_attribute *)((char *)fnode + fnode->ea_offs); 125 } 126 127 extern inline struct extended_attribute *fnode_end_ea(struct fnode *fnode) 128 { 129 return (struct extended_attribute *)((char *)fnode + fnode->ea_offs + fnode->ea_size_s); 130 } 131 132 extern inline struct extended_attribute *next_ea(struct extended_attribute *ea) 133 { 134 return (struct extended_attribute *)((char *)ea + 5 + ea->namelen + ea->valuelen); 135 } 136 137 extern inline secno ea_sec(struct extended_attribute *ea) 138 { 139 return *(secno *)((char *)ea + 9 + ea->namelen); 140 } 141 142 extern inline secno ea_len(struct extended_attribute *ea) 143 { 144 return *(secno *)((char *)ea + 5 + ea->namelen); 145 } 146 147 extern inline char *ea_data(struct extended_attribute *ea) 148 { 149 return (char *)((char *)ea + 5 + ea->namelen); 150 } 151 152 extern inline unsigned de_size(int namelen, secno down_ptr) 153 { 154 return ((0x1f + namelen + 3) & ~3) + (down_ptr ? 4 : 0); 155 } 156 157 extern inline void copy_de(struct hpfs_dirent *dst, struct hpfs_dirent *src) 158 { 159 int a; 160 int n; 161 if (!dst || !src) return; 162 a = dst->down; 163 n = dst->not_8x3; 164 memcpy((char *)dst + 2, (char *)src + 2, 28); 165 dst->down = a; 166 dst->not_8x3 = n; 167 } 168 169 extern inline unsigned tstbits(unsigned *bmp, unsigned b, unsigned n) 170 { 171 int i; 172 if ((b >= 0x4000) || (b + n - 1 >= 0x4000)) return n; 173 if (!((bmp[(b & 0x3fff) >> 5] >> (b & 0x1f)) & 1)) return 1; 174 for (i = 1; i < n; i++) 175 if (/*b+i < 0x4000 &&*/ !((bmp[((b+i) & 0x3fff) >> 5] >> ((b+i) & 0x1f)) & 1)) 176 return i + 1; 177 return 0; 178 } 179 180 /* alloc.c */ 181 182 int hpfs_chk_sectors(struct super_block *, secno, int, char *); 183 secno hpfs_alloc_sector(struct super_block *, secno, unsigned, int, int); 184 int hpfs_alloc_if_possible_nolock(struct super_block *, secno); 185 int hpfs_alloc_if_possible(struct super_block *, secno); 186 void hpfs_free_sectors(struct super_block *, secno, unsigned); 187 int hpfs_check_free_dnodes(struct super_block *, int); 188 void hpfs_free_dnode(struct super_block *, secno); 189 struct dnode *hpfs_alloc_dnode(struct super_block *, secno, dnode_secno *, struct quad_buffer_head *, int); 190 struct fnode *hpfs_alloc_fnode(struct super_block *, secno, fnode_secno *, struct buffer_head **); 191 struct anode *hpfs_alloc_anode(struct super_block *, secno, anode_secno *, struct buffer_head **); 192 193 /* anode.c */ 194 195 secno hpfs_bplus_lookup(struct super_block *, struct inode *, struct bplus_header *, unsigned, struct buffer_head *); 196 secno hpfs_add_sector_to_btree(struct super_block *, secno, int, unsigned); 197 void hpfs_remove_btree(struct super_block *, struct bplus_header *); 198 int hpfs_ea_read(struct super_block *, secno, int, unsigned, unsigned, char *); 199 int hpfs_ea_write(struct super_block *, secno, int, unsigned, unsigned, char *); 200 void hpfs_ea_remove(struct super_block *, secno, int, unsigned); 201 void hpfs_truncate_btree(struct super_block *, secno, int, unsigned); 202 void hpfs_remove_fnode(struct super_block *, fnode_secno fno); 203 204 /* buffer.c */ 205 206 void hpfs_lock_creation(struct super_block *); 207 void hpfs_unlock_creation(struct super_block *); 208 void hpfs_lock_iget(struct super_block *, int); 209 void hpfs_unlock_iget(struct super_block *); 210 void hpfs_lock_inode(struct inode *); 211 void hpfs_unlock_inode(struct inode *); 212 void hpfs_lock_2inodes(struct inode *, struct inode *); 213 void hpfs_unlock_2inodes(struct inode *, struct inode *); 214 void hpfs_lock_3inodes(struct inode *, struct inode *, struct inode *); 215 void hpfs_unlock_3inodes(struct inode *, struct inode *, struct inode *); 216 void *hpfs_map_sector(struct super_block *, unsigned, struct buffer_head **, int); 217 void *hpfs_get_sector(struct super_block *, unsigned, struct buffer_head **); 218 void *hpfs_map_4sectors(struct super_block *, unsigned, struct quad_buffer_head *, int); 219 void *hpfs_get_4sectors(struct super_block *, unsigned, struct quad_buffer_head *); 220 void hpfs_brelse4(struct quad_buffer_head *); 221 void hpfs_mark_4buffers_dirty(struct quad_buffer_head *); 222 223 /* dentry.c */ 224 225 void hpfs_set_dentry_operations(struct dentry *); 226 227 /* dir.c */ 228 229 int hpfs_dir_release(struct inode *, struct file *); 230 loff_t hpfs_dir_lseek(struct file *, loff_t, int); 231 int hpfs_readdir(struct file *, void *, filldir_t); 232 struct dentry *hpfs_lookup(struct inode *, struct dentry *); 233 234 /* dnode.c */ 235 236 void hpfs_add_pos(struct inode *, loff_t *); 237 void hpfs_del_pos(struct inode *, loff_t *); 238 struct hpfs_dirent *hpfs_add_de(struct super_block *, struct dnode *, unsigned char *, unsigned, secno); 239 void hpfs_delete_de(struct super_block *, struct dnode *, struct hpfs_dirent *); 240 int hpfs_add_to_dnode(struct inode *, dnode_secno, unsigned char *, unsigned, struct hpfs_dirent *, dnode_secno); 241 int hpfs_add_dirent(struct inode *, unsigned char *, unsigned, struct hpfs_dirent *, int); 242 int hpfs_remove_dirent(struct inode *, dnode_secno, struct hpfs_dirent *, struct quad_buffer_head *, int); 243 void hpfs_count_dnodes(struct super_block *, dnode_secno, int *, int *, int *); 244 dnode_secno hpfs_de_as_down_as_possible(struct super_block *, dnode_secno dno); 245 struct hpfs_dirent *map_pos_dirent(struct inode *, loff_t *, struct quad_buffer_head *); 246 struct hpfs_dirent *map_dirent(struct inode *, dnode_secno, char *, unsigned, dnode_secno *, struct quad_buffer_head *); 247 void hpfs_remove_dtree(struct super_block *, dnode_secno); 248 struct hpfs_dirent *map_fnode_dirent(struct super_block *, fnode_secno, struct fnode *, struct quad_buffer_head *); 249 250 /* ea.c */ 251 252 void hpfs_ea_ext_remove(struct super_block *, secno, int, unsigned); 253 int hpfs_read_ea(struct super_block *, struct fnode *, char *, char *, int); 254 char *hpfs_get_ea(struct super_block *, struct fnode *, char *, int *); 255 void hpfs_set_ea(struct inode *, struct fnode *, char *, char *, int); 256 257 /* file.c */ 258 259 int hpfs_file_release(struct inode *, struct file *); 260 int hpfs_open(struct inode *, struct file *); 261 int hpfs_file_fsync(struct file *, struct dentry *, int); 262 secno hpfs_bmap(struct inode *, unsigned); 263 void hpfs_truncate(struct inode *); 264 int hpfs_get_block(struct inode *inode, long iblock, struct buffer_head *bh_result, int create); 265 ssize_t hpfs_file_write(struct file *file, const char *buf, size_t count, loff_t *ppos); 266 267 /* inode.c */ 268 269 void hpfs_read_inode(struct inode *); 270 void hpfs_write_inode_ea(struct inode *, struct fnode *); 271 void hpfs_write_inode(struct inode *); 272 void hpfs_write_inode_nolock(struct inode *); 273 int hpfs_notify_change(struct dentry *, struct iattr *); 274 void hpfs_write_if_changed(struct inode *); 275 void hpfs_delete_inode(struct inode *); 276 277 /* map.c */ 278 279 unsigned *hpfs_map_dnode_bitmap(struct super_block *, struct quad_buffer_head *); 280 unsigned *hpfs_map_bitmap(struct super_block *, unsigned, struct quad_buffer_head *, char *); 281 char *hpfs_load_code_page(struct super_block *, secno); 282 secno *hpfs_load_bitmap_directory(struct super_block *, secno bmp); 283 struct fnode *hpfs_map_fnode(struct super_block *s, ino_t, struct buffer_head **); 284 struct anode *hpfs_map_anode(struct super_block *s, anode_secno, struct buffer_head **); 285 struct dnode *hpfs_map_dnode(struct super_block *s, dnode_secno, struct quad_buffer_head *); 286 dnode_secno hpfs_fnode_dno(struct super_block *s, ino_t ino); 287 288 /* name.c */ 289 290 unsigned char hpfs_upcase(unsigned char *, unsigned char); 291 int hpfs_chk_name(unsigned char *, unsigned *); 292 char *hpfs_translate_name(struct super_block *, unsigned char *, unsigned, int, int); 293 int hpfs_compare_names(struct super_block *, unsigned char *, unsigned, unsigned char *, unsigned, int); 294 int hpfs_is_name_long(unsigned char *, unsigned); 295 void hpfs_adjust_length(unsigned char *, unsigned *); 296 void hpfs_decide_conv(struct inode *, unsigned char *, unsigned); 297 298 /* namei.c */ 299 300 int hpfs_mkdir(struct inode *, struct dentry *, int); 301 int hpfs_create(struct inode *, struct dentry *, int); 302 int hpfs_mknod(struct inode *, struct dentry *, int, int); 303 int hpfs_symlink(struct inode *, struct dentry *, const char *); 304 int hpfs_unlink(struct inode *, struct dentry *); 305 int hpfs_rmdir(struct inode *, struct dentry *); 306 int hpfs_symlink_readpage(struct file *, struct page *); 307 int hpfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *); 308 309 /* super.c */ 310 311 void hpfs_error(struct super_block *, char *, ...); 312 int hpfs_stop_cycles(struct super_block *, int, int *, int *, char *); 313 int hpfs_remount_fs(struct super_block *, int *, char *); 314 void hpfs_put_super(struct super_block *); 315 unsigned hpfs_count_one_bitmap(struct super_block *, secno); 316 int hpfs_statfs(struct super_block *, struct statfs *); 317 318 extern struct address_space_operations hpfs_aops;
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