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 <linux/smp_lock.h> 10 #include "hpfs_fn.h" 11 12 static int hpfs_dir_release(struct inode *inode, struct file *filp) 13 { 14 lock_kernel(); 15 hpfs_del_pos(inode, &filp->f_pos); 16 /*hpfs_write_if_changed(inode);*/ 17 unlock_kernel(); 18 return 0; 19 } 20 21 /* This is slow, but it's not used often */ 22 23 static loff_t hpfs_dir_lseek(struct file *filp, loff_t off, int whence) 24 { 25 loff_t new_off = off + (whence == 1 ? filp->f_pos : 0); 26 loff_t pos; 27 struct quad_buffer_head qbh; 28 struct inode *i = filp->f_path.dentry->d_inode; 29 struct hpfs_inode_info *hpfs_inode = hpfs_i(i); 30 struct super_block *s = i->i_sb; 31 32 lock_kernel(); 33 34 /*printk("dir lseek\n");*/ 35 if (new_off == 0 || new_off == 1 || new_off == 11 || new_off == 12 || new_off == 13) goto ok; 36 mutex_lock(&i->i_mutex); 37 pos = ((loff_t) hpfs_de_as_down_as_possible(s, hpfs_inode->i_dno) << 4) + 1; 38 while (pos != new_off) { 39 if (map_pos_dirent(i, &pos, &qbh)) hpfs_brelse4(&qbh); 40 else goto fail; 41 if (pos == 12) goto fail; 42 } 43 mutex_unlock(&i->i_mutex); 44 ok: 45 unlock_kernel(); 46 return filp->f_pos = new_off; 47 fail: 48 mutex_unlock(&i->i_mutex); 49 /*printk("illegal lseek: %016llx\n", new_off);*/ 50 unlock_kernel(); 51 return -ESPIPE; 52 } 53 54 static int hpfs_readdir(struct file *filp, void *dirent, filldir_t filldir) 55 { 56 struct inode *inode = filp->f_path.dentry->d_inode; 57 struct hpfs_inode_info *hpfs_inode = hpfs_i(inode); 58 struct quad_buffer_head qbh; 59 struct hpfs_dirent *de; 60 int lc; 61 long old_pos; 62 char *tempname; 63 int c1, c2 = 0; 64 int ret = 0; 65 66 lock_kernel(); 67 68 if (hpfs_sb(inode->i_sb)->sb_chk) { 69 if (hpfs_chk_sectors(inode->i_sb, inode->i_ino, 1, "dir_fnode")) { 70 ret = -EFSERROR; 71 goto out; 72 } 73 if (hpfs_chk_sectors(inode->i_sb, hpfs_inode->i_dno, 4, "dir_dnode")) { 74 ret = -EFSERROR; 75 goto out; 76 } 77 } 78 if (hpfs_sb(inode->i_sb)->sb_chk >= 2) { 79 struct buffer_head *bh; 80 struct fnode *fno; 81 int e = 0; 82 if (!(fno = hpfs_map_fnode(inode->i_sb, inode->i_ino, &bh))) { 83 ret = -EIOERROR; 84 goto out; 85 } 86 if (!fno->dirflag) { 87 e = 1; 88 hpfs_error(inode->i_sb, "not a directory, fnode %08lx", 89 (unsigned long)inode->i_ino); 90 } 91 if (hpfs_inode->i_dno != fno->u.external[0].disk_secno) { 92 e = 1; 93 hpfs_error(inode->i_sb, "corrupted inode: i_dno == %08x, fnode -> dnode == %08x", hpfs_inode->i_dno, fno->u.external[0].disk_secno); 94 } 95 brelse(bh); 96 if (e) { 97 ret = -EFSERROR; 98 goto out; 99 } 100 } 101 lc = hpfs_sb(inode->i_sb)->sb_lowercase; 102 if (filp->f_pos == 12) { /* diff -r requires this (note, that diff -r */ 103 filp->f_pos = 13; /* also fails on msdos filesystem in 2.0) */ 104 goto out; 105 } 106 if (filp->f_pos == 13) { 107 ret = -ENOENT; 108 goto out; 109 } 110 111 while (1) { 112 again: 113 /* This won't work when cycle is longer than number of dirents 114 accepted by filldir, but what can I do? 115 maybe killall -9 ls helps */ 116 if (hpfs_sb(inode->i_sb)->sb_chk) 117 if (hpfs_stop_cycles(inode->i_sb, filp->f_pos, &c1, &c2, "hpfs_readdir")) { 118 ret = -EFSERROR; 119 goto out; 120 } 121 if (filp->f_pos == 12) 122 goto out; 123 if (filp->f_pos == 3 || filp->f_pos == 4 || filp->f_pos == 5) { 124 printk("HPFS: warning: pos==%d\n",(int)filp->f_pos); 125 goto out; 126 } 127 if (filp->f_pos == 0) { 128 if (filldir(dirent, ".", 1, filp->f_pos, inode->i_ino, DT_DIR) < 0) 129 goto out; 130 filp->f_pos = 11; 131 } 132 if (filp->f_pos == 11) { 133 if (filldir(dirent, "..", 2, filp->f_pos, hpfs_inode->i_parent_dir, DT_DIR) < 0) 134 goto out; 135 filp->f_pos = 1; 136 } 137 if (filp->f_pos == 1) { 138 filp->f_pos = ((loff_t) hpfs_de_as_down_as_possible(inode->i_sb, hpfs_inode->i_dno) << 4) + 1; 139 hpfs_add_pos(inode, &filp->f_pos); 140 filp->f_version = inode->i_version; 141 } 142 old_pos = filp->f_pos; 143 if (!(de = map_pos_dirent(inode, &filp->f_pos, &qbh))) { 144 ret = -EIOERROR; 145 goto out; 146 } 147 if (de->first || de->last) { 148 if (hpfs_sb(inode->i_sb)->sb_chk) { 149 if (de->first && !de->last && (de->namelen != 2 150 || de ->name[0] != 1 || de->name[1] != 1)) 151 hpfs_error(inode->i_sb, "hpfs_readdir: bad ^A^A entry; pos = %08lx", old_pos); 152 if (de->last && (de->namelen != 1 || de ->name[0] != 255)) 153 hpfs_error(inode->i_sb, "hpfs_readdir: bad \\377 entry; pos = %08lx", old_pos); 154 } 155 hpfs_brelse4(&qbh); 156 goto again; 157 } 158 tempname = hpfs_translate_name(inode->i_sb, de->name, de->namelen, lc, de->not_8x3); 159 if (filldir(dirent, tempname, de->namelen, old_pos, de->fnode, DT_UNKNOWN) < 0) { 160 filp->f_pos = old_pos; 161 if (tempname != (char *)de->name) kfree(tempname); 162 hpfs_brelse4(&qbh); 163 goto out; 164 } 165 if (tempname != (char *)de->name) kfree(tempname); 166 hpfs_brelse4(&qbh); 167 } 168 out: 169 unlock_kernel(); 170 return ret; 171 } 172 173 /* 174 * lookup. Search the specified directory for the specified name, set 175 * *result to the corresponding inode. 176 * 177 * lookup uses the inode number to tell read_inode whether it is reading 178 * the inode of a directory or a file -- file ino's are odd, directory 179 * ino's are even. read_inode avoids i/o for file inodes; everything 180 * needed is up here in the directory. (And file fnodes are out in 181 * the boondocks.) 182 * 183 * - M.P.: this is over, sometimes we've got to read file's fnode for eas 184 * inode numbers are just fnode sector numbers; iget lock is used 185 * to tell read_inode to read fnode or not. 186 */ 187 188 struct dentry *hpfs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) 189 { 190 const char *name = dentry->d_name.name; 191 unsigned len = dentry->d_name.len; 192 struct quad_buffer_head qbh; 193 struct hpfs_dirent *de; 194 ino_t ino; 195 int err; 196 struct inode *result = NULL; 197 struct hpfs_inode_info *hpfs_result; 198 199 lock_kernel(); 200 if ((err = hpfs_chk_name((char *)name, &len))) { 201 if (err == -ENAMETOOLONG) { 202 unlock_kernel(); 203 return ERR_PTR(-ENAMETOOLONG); 204 } 205 goto end_add; 206 } 207 208 /* 209 * '.' and '..' will never be passed here. 210 */ 211 212 de = map_dirent(dir, hpfs_i(dir)->i_dno, (char *) name, len, NULL, &qbh); 213 214 /* 215 * This is not really a bailout, just means file not found. 216 */ 217 218 if (!de) goto end; 219 220 /* 221 * Get inode number, what we're after. 222 */ 223 224 ino = de->fnode; 225 226 /* 227 * Go find or make an inode. 228 */ 229 230 result = iget_locked(dir->i_sb, ino); 231 if (!result) { 232 hpfs_error(dir->i_sb, "hpfs_lookup: can't get inode"); 233 goto bail1; 234 } 235 if (result->i_state & I_NEW) { 236 hpfs_init_inode(result); 237 if (de->directory) 238 hpfs_read_inode(result); 239 else if (de->ea_size && hpfs_sb(dir->i_sb)->sb_eas) 240 hpfs_read_inode(result); 241 else { 242 result->i_mode |= S_IFREG; 243 result->i_mode &= ~0111; 244 result->i_op = &hpfs_file_iops; 245 result->i_fop = &hpfs_file_ops; 246 result->i_nlink = 1; 247 } 248 unlock_new_inode(result); 249 } 250 hpfs_result = hpfs_i(result); 251 if (!de->directory) hpfs_result->i_parent_dir = dir->i_ino; 252 253 hpfs_decide_conv(result, (char *)name, len); 254 255 if (de->has_acl || de->has_xtd_perm) if (!(dir->i_sb->s_flags & MS_RDONLY)) { 256 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"); 257 goto bail1; 258 } 259 260 /* 261 * Fill in the info from the directory if this is a newly created 262 * inode. 263 */ 264 265 if (!result->i_ctime.tv_sec) { 266 if (!(result->i_ctime.tv_sec = local_to_gmt(dir->i_sb, de->creation_date))) 267 result->i_ctime.tv_sec = 1; 268 result->i_ctime.tv_nsec = 0; 269 result->i_mtime.tv_sec = local_to_gmt(dir->i_sb, de->write_date); 270 result->i_mtime.tv_nsec = 0; 271 result->i_atime.tv_sec = local_to_gmt(dir->i_sb, de->read_date); 272 result->i_atime.tv_nsec = 0; 273 hpfs_result->i_ea_size = de->ea_size; 274 if (!hpfs_result->i_ea_mode && de->read_only) 275 result->i_mode &= ~0222; 276 if (!de->directory) { 277 if (result->i_size == -1) { 278 result->i_size = de->file_size; 279 result->i_data.a_ops = &hpfs_aops; 280 hpfs_i(result)->mmu_private = result->i_size; 281 /* 282 * i_blocks should count the fnode and any anodes. 283 * We count 1 for the fnode and don't bother about 284 * anodes -- the disk heads are on the directory band 285 * and we want them to stay there. 286 */ 287 result->i_blocks = 1 + ((result->i_size + 511) >> 9); 288 } 289 } 290 } 291 292 hpfs_brelse4(&qbh); 293 294 /* 295 * Made it. 296 */ 297 298 end: 299 end_add: 300 hpfs_set_dentry_operations(dentry); 301 unlock_kernel(); 302 d_add(dentry, result); 303 return NULL; 304 305 /* 306 * Didn't. 307 */ 308 bail1: 309 310 hpfs_brelse4(&qbh); 311 312 /*bail:*/ 313 314 unlock_kernel(); 315 return ERR_PTR(-ENOENT); 316 } 317 318 const struct file_operations hpfs_dir_ops = 319 { 320 .llseek = hpfs_dir_lseek, 321 .read = generic_read_dir, 322 .readdir = hpfs_readdir, 323 .release = hpfs_dir_release, 324 .fsync = hpfs_file_fsync, 325 }; 326