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_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_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 %08x",inode->i_ino); 88 } 89 if (hpfs_inode->i_dno != fno->u.external[0].disk_secno) { 90 e = 1; 91 hpfs_error(inode->i_sb, "corrupted inode: i_dno == %08x, fnode -> dnode == %08x", hpfs_inode->i_dno, fno->u.external[0].disk_secno); 92 } 93 brelse(bh); 94 if (e) { 95 ret = -EFSERROR; 96 goto out; 97 } 98 } 99 lc = hpfs_sb(inode->i_sb)->sb_lowercase; 100 if (filp->f_pos == 12) { /* diff -r requires this (note, that diff -r */ 101 filp->f_pos = 13; /* also fails on msdos filesystem in 2.0) */ 102 goto out; 103 } 104 if (filp->f_pos == 13) { 105 ret = -ENOENT; 106 goto out; 107 } 108 109 while (1) { 110 again: 111 /* This won't work when cycle is longer than number of dirents 112 accepted by filldir, but what can I do? 113 maybe killall -9 ls helps */ 114 if (hpfs_sb(inode->i_sb)->sb_chk) 115 if (hpfs_stop_cycles(inode->i_sb, filp->f_pos, &c1, &c2, "hpfs_readdir")) { 116 ret = -EFSERROR; 117 goto out; 118 } 119 if (filp->f_pos == 12) 120 goto out; 121 if (filp->f_pos == 3 || filp->f_pos == 4 || filp->f_pos == 5) { 122 printk("HPFS: warning: pos==%d\n",(int)filp->f_pos); 123 goto out; 124 } 125 if (filp->f_pos == 0) { 126 if (filldir(dirent, ".", 1, filp->f_pos, inode->i_ino, DT_DIR) < 0) 127 goto out; 128 filp->f_pos = 11; 129 } 130 if (filp->f_pos == 11) { 131 if (filldir(dirent, "..", 2, filp->f_pos, hpfs_inode->i_parent_dir, DT_DIR) < 0) 132 goto out; 133 filp->f_pos = 1; 134 } 135 if (filp->f_pos == 1) { 136 filp->f_pos = ((loff_t) hpfs_de_as_down_as_possible(inode->i_sb, hpfs_inode->i_dno) << 4) + 1; 137 hpfs_add_pos(inode, &filp->f_pos); 138 filp->f_version = inode->i_version; 139 } 140 old_pos = filp->f_pos; 141 if (!(de = map_pos_dirent(inode, &filp->f_pos, &qbh))) { 142 ret = -EIOERROR; 143 goto out; 144 } 145 if (de->first || de->last) { 146 if (hpfs_sb(inode->i_sb)->sb_chk) { 147 if (de->first && !de->last && (de->namelen != 2 || de ->name[0] != 1 || de->name[1] != 1)) hpfs_error(inode->i_sb, "hpfs_readdir: bad ^A^A entry; pos = %08x", old_pos); 148 if (de->last && (de->namelen != 1 || de ->name[0] != 255)) hpfs_error(inode->i_sb, "hpfs_readdir: bad \\377 entry; pos = %08x", old_pos); 149 } 150 hpfs_brelse4(&qbh); 151 goto again; 152 } 153 tempname = hpfs_translate_name(inode->i_sb, de->name, de->namelen, lc, de->not_8x3); 154 if (filldir(dirent, tempname, de->namelen, old_pos, de->fnode, DT_UNKNOWN) < 0) { 155 filp->f_pos = old_pos; 156 if (tempname != (char *)de->name) kfree(tempname); 157 hpfs_brelse4(&qbh); 158 goto out; 159 } 160 if (tempname != (char *)de->name) kfree(tempname); 161 hpfs_brelse4(&qbh); 162 } 163 out: 164 unlock_kernel(); 165 return ret; 166 } 167 168 /* 169 * lookup. Search the specified directory for the specified name, set 170 * *result to the corresponding inode. 171 * 172 * lookup uses the inode number to tell read_inode whether it is reading 173 * the inode of a directory or a file -- file ino's are odd, directory 174 * ino's are even. read_inode avoids i/o for file inodes; everything 175 * needed is up here in the directory. (And file fnodes are out in 176 * the boondocks.) 177 * 178 * - M.P.: this is over, sometimes we've got to read file's fnode for eas 179 * inode numbers are just fnode sector numbers; iget lock is used 180 * to tell read_inode to read fnode or not. 181 */ 182 183 struct dentry *hpfs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) 184 { 185 const char *name = dentry->d_name.name; 186 unsigned len = dentry->d_name.len; 187 struct quad_buffer_head qbh; 188 struct hpfs_dirent *de; 189 ino_t ino; 190 int err; 191 struct inode *result = NULL; 192 struct hpfs_inode_info *hpfs_result; 193 194 lock_kernel(); 195 if ((err = hpfs_chk_name((char *)name, &len))) { 196 if (err == -ENAMETOOLONG) { 197 unlock_kernel(); 198 return ERR_PTR(-ENAMETOOLONG); 199 } 200 goto end_add; 201 } 202 203 /* 204 * '.' and '..' will never be passed here. 205 */ 206 207 de = map_dirent(dir, hpfs_i(dir)->i_dno, (char *) name, len, NULL, &qbh); 208 209 /* 210 * This is not really a bailout, just means file not found. 211 */ 212 213 if (!de) goto end; 214 215 /* 216 * Get inode number, what we're after. 217 */ 218 219 ino = de->fnode; 220 221 /* 222 * Go find or make an inode. 223 */ 224 225 result = iget_locked(dir->i_sb, ino); 226 if (!result) { 227 hpfs_error(dir->i_sb, "hpfs_lookup: can't get inode"); 228 goto bail1; 229 } 230 if (result->i_state & I_NEW) { 231 hpfs_init_inode(result); 232 if (de->directory) 233 hpfs_read_inode(result); 234 else if (de->ea_size && hpfs_sb(dir->i_sb)->sb_eas) 235 hpfs_read_inode(result); 236 else { 237 result->i_mode |= S_IFREG; 238 result->i_mode &= ~0111; 239 result->i_op = &hpfs_file_iops; 240 result->i_fop = &hpfs_file_ops; 241 result->i_nlink = 1; 242 } 243 unlock_new_inode(result); 244 } 245 hpfs_result = hpfs_i(result); 246 if (!de->directory) hpfs_result->i_parent_dir = dir->i_ino; 247 248 hpfs_decide_conv(result, (char *)name, len); 249 250 if (de->has_acl || de->has_xtd_perm) if (!(dir->i_sb->s_flags & MS_RDONLY)) { 251 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"); 252 goto bail1; 253 } 254 255 /* 256 * Fill in the info from the directory if this is a newly created 257 * inode. 258 */ 259 260 if (!result->i_ctime.tv_sec) { 261 if (!(result->i_ctime.tv_sec = local_to_gmt(dir->i_sb, de->creation_date))) 262 result->i_ctime.tv_sec = 1; 263 result->i_ctime.tv_nsec = 0; 264 result->i_mtime.tv_sec = local_to_gmt(dir->i_sb, de->write_date); 265 result->i_mtime.tv_nsec = 0; 266 result->i_atime.tv_sec = local_to_gmt(dir->i_sb, de->read_date); 267 result->i_atime.tv_nsec = 0; 268 hpfs_result->i_ea_size = de->ea_size; 269 if (!hpfs_result->i_ea_mode && de->read_only) 270 result->i_mode &= ~0222; 271 if (!de->directory) { 272 if (result->i_size == -1) { 273 result->i_size = de->file_size; 274 result->i_data.a_ops = &hpfs_aops; 275 hpfs_i(result)->mmu_private = result->i_size; 276 /* 277 * i_blocks should count the fnode and any anodes. 278 * We count 1 for the fnode and don't bother about 279 * anodes -- the disk heads are on the directory band 280 * and we want them to stay there. 281 */ 282 result->i_blocks = 1 + ((result->i_size + 511) >> 9); 283 } 284 } 285 } 286 287 hpfs_brelse4(&qbh); 288 289 /* 290 * Made it. 291 */ 292 293 end: 294 end_add: 295 hpfs_set_dentry_operations(dentry); 296 unlock_kernel(); 297 d_add(dentry, result); 298 return NULL; 299 300 /* 301 * Didn't. 302 */ 303 bail1: 304 305 hpfs_brelse4(&qbh); 306 307 /*bail:*/ 308 309 unlock_kernel(); 310 return ERR_PTR(-ENOENT); 311 } 312 313 struct file_operations hpfs_dir_ops = 314 { 315 .llseek = hpfs_dir_lseek, 316 .read = generic_read_dir, 317 .readdir = hpfs_readdir, 318 .release = hpfs_dir_release, 319 .fsync = hpfs_file_fsync, 320 }; 321