1 /* 2 * linux/fs/hpfs/dir.c 3 * 4 * Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999 5 * 6 * directory VFS functions 7 */ 8 9 #include "hpfs_fn.h" 10 11 static int hpfs_dir_release(struct inode *inode, struct file *filp) 12 { 13 lock_kernel(); 14 hpfs_del_pos(inode, &filp->f_pos); 15 /*hpfs_write_if_changed(inode);*/ 16 unlock_kernel(); 17 return 0; 18 } 19 20 /* This is slow, but it's not used often */ 21 22 static loff_t hpfs_dir_lseek(struct file *filp, loff_t off, int whence) 23 { 24 loff_t new_off = off + (whence == 1 ? filp->f_pos : 0); 25 loff_t pos; 26 struct quad_buffer_head qbh; 27 struct inode *i = filp->f_path.dentry->d_inode; 28 struct hpfs_inode_info *hpfs_inode = hpfs_i(i); 29 struct super_block *s = i->i_sb; 30 31 lock_kernel(); 32 33 /*printk("dir lseek\n");*/ 34 if (new_off == 0 || new_off == 1 || new_off == 11 || new_off == 12 || new_off == 13) goto ok; 35 mutex_lock(&i->i_mutex); 36 pos = ((loff_t) hpfs_de_as_down_as_possible(s, hpfs_inode->i_dno) << 4) + 1; 37 while (pos != new_off) { 38 if (map_pos_dirent(i, &pos, &qbh)) hpfs_brelse4(&qbh); 39 else goto fail; 40 if (pos == 12) goto fail; 41 } 42 mutex_unlock(&i->i_mutex); 43 ok: 44 unlock_kernel(); 45 return filp->f_pos = new_off; 46 fail: 47 mutex_unlock(&i->i_mutex); 48 /*printk("illegal lseek: %016llx\n", new_off);*/ 49 unlock_kernel(); 50 return -ESPIPE; 51 } 52 53 static int hpfs_readdir(struct file *filp, void *dirent, filldir_t filldir) 54 { 55 struct inode *inode = filp->f_path.dentry->d_inode; 56 struct hpfs_inode_info *hpfs_inode = hpfs_i(inode); 57 struct quad_buffer_head qbh; 58 struct hpfs_dirent *de; 59 int lc; 60 long old_pos; 61 char *tempname; 62 int c1, c2 = 0; 63 int ret = 0; 64 65 lock_kernel(); 66 67 if (hpfs_sb(inode->i_sb)->sb_chk) { 68 if (hpfs_chk_sectors(inode->i_sb, inode->i_ino, 1, "dir_fnode")) { 69 ret = -EFSERROR; 70 goto out; 71 } 72 if (hpfs_chk_sectors(inode->i_sb, hpfs_inode->i_dno, 4, "dir_dnode")) { 73 ret = -EFSERROR; 74 goto out; 75 } 76 } 77 if (hpfs_sb(inode->i_sb)->sb_chk >= 2) { 78 struct buffer_head *bh; 79 struct fnode *fno; 80 int e = 0; 81 if (!(fno = hpfs_map_fnode(inode->i_sb, inode->i_ino, &bh))) { 82 ret = -EIOERROR; 83 goto out; 84 } 85 if (!fno->dirflag) { 86 e = 1; 87 hpfs_error(inode->i_sb, "not a directory, fnode %08lx", 88 (unsigned long)inode->i_ino); 89 } 90 if (hpfs_inode->i_dno != fno->u.external[0].disk_secno) { 91 e = 1; 92 hpfs_error(inode->i_sb, "corrupted inode: i_dno == %08x, fnode -> dnode == %08x", hpfs_inode->i_dno, fno->u.external[0].disk_secno); 93 } 94 brelse(bh); 95 if (e) { 96 ret = -EFSERROR; 97 goto out; 98 } 99 } 100 lc = hpfs_sb(inode->i_sb)->sb_lowercase; 101 if (filp->f_pos == 12) { /* diff -r requires this (note, that diff -r */ 102 filp->f_pos = 13; /* also fails on msdos filesystem in 2.0) */ 103 goto out; 104 } 105 if (filp->f_pos == 13) { 106 ret = -ENOENT; 107 goto out; 108 } 109 110 while (1) { 111 again: 112 /* This won't work when cycle is longer than number of dirents 113 accepted by filldir, but what can I do? 114 maybe killall -9 ls helps */ 115 if (hpfs_sb(inode->i_sb)->sb_chk) 116 if (hpfs_stop_cycles(inode->i_sb, filp->f_pos, &c1, &c2, "hpfs_readdir")) { 117 ret = -EFSERROR; 118 goto out; 119 } 120 if (filp->f_pos == 12) 121 goto out; 122 if (filp->f_pos == 3 || filp->f_pos == 4 || filp->f_pos == 5) { 123 printk("HPFS: warning: pos==%d\n",(int)filp->f_pos); 124 goto out; 125 } 126 if (filp->f_pos == 0) { 127 if (filldir(dirent, ".", 1, filp->f_pos, inode->i_ino, DT_DIR) < 0) 128 goto out; 129 filp->f_pos = 11; 130 } 131 if (filp->f_pos == 11) { 132 if (filldir(dirent, "..", 2, filp->f_pos, hpfs_inode->i_parent_dir, DT_DIR) < 0) 133 goto out; 134 filp->f_pos = 1; 135 } 136 if (filp->f_pos == 1) { 137 filp->f_pos = ((loff_t) hpfs_de_as_down_as_possible(inode->i_sb, hpfs_inode->i_dno) << 4) + 1; 138 hpfs_add_pos(inode, &filp->f_pos); 139 filp->f_version = inode->i_version; 140 } 141 old_pos = filp->f_pos; 142 if (!(de = map_pos_dirent(inode, &filp->f_pos, &qbh))) { 143 ret = -EIOERROR; 144 goto out; 145 } 146 if (de->first || de->last) { 147 if (hpfs_sb(inode->i_sb)->sb_chk) { 148 if (de->first && !de->last && (de->namelen != 2 149 || de ->name[0] != 1 || de->name[1] != 1)) 150 hpfs_error(inode->i_sb, "hpfs_readdir: bad ^A^A entry; pos = %08lx", old_pos); 151 if (de->last && (de->namelen != 1 || de ->name[0] != 255)) 152 hpfs_error(inode->i_sb, "hpfs_readdir: bad \\377 entry; pos = %08lx", old_pos); 153 } 154 hpfs_brelse4(&qbh); 155 goto again; 156 } 157 tempname = hpfs_translate_name(inode->i_sb, de->name, de->namelen, lc, de->not_8x3); 158 if (filldir(dirent, tempname, de->namelen, old_pos, de->fnode, DT_UNKNOWN) < 0) { 159 filp->f_pos = old_pos; 160 if (tempname != (char *)de->name) kfree(tempname); 161 hpfs_brelse4(&qbh); 162 goto out; 163 } 164 if (tempname != (char *)de->name) kfree(tempname); 165 hpfs_brelse4(&qbh); 166 } 167 out: 168 unlock_kernel(); 169 return ret; 170 } 171 172 /* 173 * lookup. Search the specified directory for the specified name, set 174 * *result to the corresponding inode. 175 * 176 * lookup uses the inode number to tell read_inode whether it is reading 177 * the inode of a directory or a file -- file ino's are odd, directory 178 * ino's are even. read_inode avoids i/o for file inodes; everything 179 * needed is up here in the directory. (And file fnodes are out in 180 * the boondocks.) 181 * 182 * - M.P.: this is over, sometimes we've got to read file's fnode for eas 183 * inode numbers are just fnode sector numbers; iget lock is used 184 * to tell read_inode to read fnode or not. 185 */ 186 187 struct dentry *hpfs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) 188 { 189 const char *name = dentry->d_name.name; 190 unsigned len = dentry->d_name.len; 191 struct quad_buffer_head qbh; 192 struct hpfs_dirent *de; 193 ino_t ino; 194 int err; 195 struct inode *result = NULL; 196 struct hpfs_inode_info *hpfs_result; 197 198 lock_kernel(); 199 if ((err = hpfs_chk_name((char *)name, &len))) { 200 if (err == -ENAMETOOLONG) { 201 unlock_kernel(); 202 return ERR_PTR(-ENAMETOOLONG); 203 } 204 goto end_add; 205 } 206 207 /* 208 * '.' and '..' will never be passed here. 209 */ 210 211 de = map_dirent(dir, hpfs_i(dir)->i_dno, (char *) name, len, NULL, &qbh); 212 213 /* 214 * This is not really a bailout, just means file not found. 215 */ 216 217 if (!de) goto end; 218 219 /* 220 * Get inode number, what we're after. 221 */ 222 223 ino = de->fnode; 224 225 /* 226 * Go find or make an inode. 227 */ 228 229 result = iget_locked(dir->i_sb, ino); 230 if (!result) { 231 hpfs_error(dir->i_sb, "hpfs_lookup: can't get inode"); 232 goto bail1; 233 } 234 if (result->i_state & I_NEW) { 235 hpfs_init_inode(result); 236 if (de->directory) 237 hpfs_read_inode(result); 238 else if (de->ea_size && hpfs_sb(dir->i_sb)->sb_eas) 239 hpfs_read_inode(result); 240 else { 241 result->i_mode |= S_IFREG; 242 result->i_mode &= ~0111; 243 result->i_op = &hpfs_file_iops; 244 result->i_fop = &hpfs_file_ops; 245 result->i_nlink = 1; 246 } 247 unlock_new_inode(result); 248 } 249 hpfs_result = hpfs_i(result); 250 if (!de->directory) hpfs_result->i_parent_dir = dir->i_ino; 251 252 hpfs_decide_conv(result, (char *)name, len); 253 254 if (de->has_acl || de->has_xtd_perm) if (!(dir->i_sb->s_flags & MS_RDONLY)) { 255 hpfs_error(result->i_sb, "ACLs or XPERM found. This is probably HPFS386. This driver doesn't support it now. Send me some info on these structures"); 256 goto bail1; 257 } 258 259 /* 260 * Fill in the info from the directory if this is a newly created 261 * inode. 262 */ 263 264 if (!result->i_ctime.tv_sec) { 265 if (!(result->i_ctime.tv_sec = local_to_gmt(dir->i_sb, de->creation_date))) 266 result->i_ctime.tv_sec = 1; 267 result->i_ctime.tv_nsec = 0; 268 result->i_mtime.tv_sec = local_to_gmt(dir->i_sb, de->write_date); 269 result->i_mtime.tv_nsec = 0; 270 result->i_atime.tv_sec = local_to_gmt(dir->i_sb, de->read_date); 271 result->i_atime.tv_nsec = 0; 272 hpfs_result->i_ea_size = de->ea_size; 273 if (!hpfs_result->i_ea_mode && de->read_only) 274 result->i_mode &= ~0222; 275 if (!de->directory) { 276 if (result->i_size == -1) { 277 result->i_size = de->file_size; 278 result->i_data.a_ops = &hpfs_aops; 279 hpfs_i(result)->mmu_private = result->i_size; 280 /* 281 * i_blocks should count the fnode and any anodes. 282 * We count 1 for the fnode and don't bother about 283 * anodes -- the disk heads are on the directory band 284 * and we want them to stay there. 285 */ 286 result->i_blocks = 1 + ((result->i_size + 511) >> 9); 287 } 288 } 289 } 290 291 hpfs_brelse4(&qbh); 292 293 /* 294 * Made it. 295 */ 296 297 end: 298 end_add: 299 hpfs_set_dentry_operations(dentry); 300 unlock_kernel(); 301 d_add(dentry, result); 302 return NULL; 303 304 /* 305 * Didn't. 306 */ 307 bail1: 308 309 hpfs_brelse4(&qbh); 310 311 /*bail:*/ 312 313 unlock_kernel(); 314 return ERR_PTR(-ENOENT); 315 } 316 317 const struct file_operations hpfs_dir_ops = 318 { 319 .llseek = hpfs_dir_lseek, 320 .read = generic_read_dir, 321 .readdir = hpfs_readdir, 322 .release = hpfs_dir_release, 323 .fsync = hpfs_file_fsync, 324 }; 325