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/slab.h> 10 #include "hpfs_fn.h" 11 12 static int hpfs_dir_release(struct inode *inode, struct file *filp) 13 { 14 hpfs_lock(inode->i_sb); 15 hpfs_del_pos(inode, &filp->f_pos); 16 /*hpfs_write_if_changed(inode);*/ 17 hpfs_unlock(inode->i_sb); 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 = file_inode(filp); 29 struct hpfs_inode_info *hpfs_inode = hpfs_i(i); 30 struct super_block *s = i->i_sb; 31 32 /* Somebody else will have to figure out what to do here */ 33 if (whence == SEEK_DATA || whence == SEEK_HOLE) 34 return -EINVAL; 35 36 mutex_lock(&i->i_mutex); 37 hpfs_lock(s); 38 39 /*printk("dir lseek\n");*/ 40 if (new_off == 0 || new_off == 1 || new_off == 11 || new_off == 12 || new_off == 13) goto ok; 41 pos = ((loff_t) hpfs_de_as_down_as_possible(s, hpfs_inode->i_dno) << 4) + 1; 42 while (pos != new_off) { 43 if (map_pos_dirent(i, &pos, &qbh)) hpfs_brelse4(&qbh); 44 else goto fail; 45 if (pos == 12) goto fail; 46 } 47 hpfs_add_pos(i, &filp->f_pos); 48 ok: 49 filp->f_pos = new_off; 50 hpfs_unlock(s); 51 mutex_unlock(&i->i_mutex); 52 return new_off; 53 fail: 54 /*printk("illegal lseek: %016llx\n", new_off);*/ 55 hpfs_unlock(s); 56 mutex_unlock(&i->i_mutex); 57 return -ESPIPE; 58 } 59 60 static int hpfs_readdir(struct file *filp, void *dirent, filldir_t filldir) 61 { 62 struct inode *inode = file_inode(filp); 63 struct hpfs_inode_info *hpfs_inode = hpfs_i(inode); 64 struct quad_buffer_head qbh; 65 struct hpfs_dirent *de; 66 int lc; 67 long old_pos; 68 unsigned char *tempname; 69 int c1, c2 = 0; 70 int ret = 0; 71 72 hpfs_lock(inode->i_sb); 73 74 if (hpfs_sb(inode->i_sb)->sb_chk) { 75 if (hpfs_chk_sectors(inode->i_sb, inode->i_ino, 1, "dir_fnode")) { 76 ret = -EFSERROR; 77 goto out; 78 } 79 if (hpfs_chk_sectors(inode->i_sb, hpfs_inode->i_dno, 4, "dir_dnode")) { 80 ret = -EFSERROR; 81 goto out; 82 } 83 } 84 if (hpfs_sb(inode->i_sb)->sb_chk >= 2) { 85 struct buffer_head *bh; 86 struct fnode *fno; 87 int e = 0; 88 if (!(fno = hpfs_map_fnode(inode->i_sb, inode->i_ino, &bh))) { 89 ret = -EIOERROR; 90 goto out; 91 } 92 if (!fnode_is_dir(fno)) { 93 e = 1; 94 hpfs_error(inode->i_sb, "not a directory, fnode %08lx", 95 (unsigned long)inode->i_ino); 96 } 97 if (hpfs_inode->i_dno != le32_to_cpu(fno->u.external[0].disk_secno)) { 98 e = 1; 99 hpfs_error(inode->i_sb, "corrupted inode: i_dno == %08x, fnode -> dnode == %08x", hpfs_inode->i_dno, le32_to_cpu(fno->u.external[0].disk_secno)); 100 } 101 brelse(bh); 102 if (e) { 103 ret = -EFSERROR; 104 goto out; 105 } 106 } 107 lc = hpfs_sb(inode->i_sb)->sb_lowercase; 108 if (filp->f_pos == 12) { /* diff -r requires this (note, that diff -r */ 109 filp->f_pos = 13; /* also fails on msdos filesystem in 2.0) */ 110 goto out; 111 } 112 if (filp->f_pos == 13) { 113 ret = -ENOENT; 114 goto out; 115 } 116 117 while (1) { 118 again: 119 /* This won't work when cycle is longer than number of dirents 120 accepted by filldir, but what can I do? 121 maybe killall -9 ls helps */ 122 if (hpfs_sb(inode->i_sb)->sb_chk) 123 if (hpfs_stop_cycles(inode->i_sb, filp->f_pos, &c1, &c2, "hpfs_readdir")) { 124 ret = -EFSERROR; 125 goto out; 126 } 127 if (filp->f_pos == 12) 128 goto out; 129 if (filp->f_pos == 3 || filp->f_pos == 4 || filp->f_pos == 5) { 130 printk("HPFS: warning: pos==%d\n",(int)filp->f_pos); 131 goto out; 132 } 133 if (filp->f_pos == 0) { 134 if (filldir(dirent, ".", 1, filp->f_pos, inode->i_ino, DT_DIR) < 0) 135 goto out; 136 filp->f_pos = 11; 137 } 138 if (filp->f_pos == 11) { 139 if (filldir(dirent, "..", 2, filp->f_pos, hpfs_inode->i_parent_dir, DT_DIR) < 0) 140 goto out; 141 filp->f_pos = 1; 142 } 143 if (filp->f_pos == 1) { 144 filp->f_pos = ((loff_t) hpfs_de_as_down_as_possible(inode->i_sb, hpfs_inode->i_dno) << 4) + 1; 145 hpfs_add_pos(inode, &filp->f_pos); 146 filp->f_version = inode->i_version; 147 } 148 old_pos = filp->f_pos; 149 if (!(de = map_pos_dirent(inode, &filp->f_pos, &qbh))) { 150 ret = -EIOERROR; 151 goto out; 152 } 153 if (de->first || de->last) { 154 if (hpfs_sb(inode->i_sb)->sb_chk) { 155 if (de->first && !de->last && (de->namelen != 2 156 || de ->name[0] != 1 || de->name[1] != 1)) 157 hpfs_error(inode->i_sb, "hpfs_readdir: bad ^A^A entry; pos = %08lx", old_pos); 158 if (de->last && (de->namelen != 1 || de ->name[0] != 255)) 159 hpfs_error(inode->i_sb, "hpfs_readdir: bad \\377 entry; pos = %08lx", old_pos); 160 } 161 hpfs_brelse4(&qbh); 162 goto again; 163 } 164 tempname = hpfs_translate_name(inode->i_sb, de->name, de->namelen, lc, de->not_8x3); 165 if (filldir(dirent, tempname, de->namelen, old_pos, le32_to_cpu(de->fnode), DT_UNKNOWN) < 0) { 166 filp->f_pos = old_pos; 167 if (tempname != de->name) kfree(tempname); 168 hpfs_brelse4(&qbh); 169 goto out; 170 } 171 if (tempname != de->name) kfree(tempname); 172 hpfs_brelse4(&qbh); 173 } 174 out: 175 hpfs_unlock(inode->i_sb); 176 return ret; 177 } 178 179 /* 180 * lookup. Search the specified directory for the specified name, set 181 * *result to the corresponding inode. 182 * 183 * lookup uses the inode number to tell read_inode whether it is reading 184 * the inode of a directory or a file -- file ino's are odd, directory 185 * ino's are even. read_inode avoids i/o for file inodes; everything 186 * needed is up here in the directory. (And file fnodes are out in 187 * the boondocks.) 188 * 189 * - M.P.: this is over, sometimes we've got to read file's fnode for eas 190 * inode numbers are just fnode sector numbers; iget lock is used 191 * to tell read_inode to read fnode or not. 192 */ 193 194 struct dentry *hpfs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) 195 { 196 const unsigned char *name = dentry->d_name.name; 197 unsigned len = dentry->d_name.len; 198 struct quad_buffer_head qbh; 199 struct hpfs_dirent *de; 200 ino_t ino; 201 int err; 202 struct inode *result = NULL; 203 struct hpfs_inode_info *hpfs_result; 204 205 hpfs_lock(dir->i_sb); 206 if ((err = hpfs_chk_name(name, &len))) { 207 if (err == -ENAMETOOLONG) { 208 hpfs_unlock(dir->i_sb); 209 return ERR_PTR(-ENAMETOOLONG); 210 } 211 goto end_add; 212 } 213 214 /* 215 * '.' and '..' will never be passed here. 216 */ 217 218 de = map_dirent(dir, hpfs_i(dir)->i_dno, name, len, NULL, &qbh); 219 220 /* 221 * This is not really a bailout, just means file not found. 222 */ 223 224 if (!de) goto end; 225 226 /* 227 * Get inode number, what we're after. 228 */ 229 230 ino = le32_to_cpu(de->fnode); 231 232 /* 233 * Go find or make an inode. 234 */ 235 236 result = iget_locked(dir->i_sb, ino); 237 if (!result) { 238 hpfs_error(dir->i_sb, "hpfs_lookup: can't get inode"); 239 goto bail1; 240 } 241 if (result->i_state & I_NEW) { 242 hpfs_init_inode(result); 243 if (de->directory) 244 hpfs_read_inode(result); 245 else if (le32_to_cpu(de->ea_size) && hpfs_sb(dir->i_sb)->sb_eas) 246 hpfs_read_inode(result); 247 else { 248 result->i_mode |= S_IFREG; 249 result->i_mode &= ~0111; 250 result->i_op = &hpfs_file_iops; 251 result->i_fop = &hpfs_file_ops; 252 set_nlink(result, 1); 253 } 254 unlock_new_inode(result); 255 } 256 hpfs_result = hpfs_i(result); 257 if (!de->directory) hpfs_result->i_parent_dir = dir->i_ino; 258 259 if (de->has_acl || de->has_xtd_perm) if (!(dir->i_sb->s_flags & MS_RDONLY)) { 260 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"); 261 goto bail1; 262 } 263 264 /* 265 * Fill in the info from the directory if this is a newly created 266 * inode. 267 */ 268 269 if (!result->i_ctime.tv_sec) { 270 if (!(result->i_ctime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(de->creation_date)))) 271 result->i_ctime.tv_sec = 1; 272 result->i_ctime.tv_nsec = 0; 273 result->i_mtime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(de->write_date)); 274 result->i_mtime.tv_nsec = 0; 275 result->i_atime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(de->read_date)); 276 result->i_atime.tv_nsec = 0; 277 hpfs_result->i_ea_size = le32_to_cpu(de->ea_size); 278 if (!hpfs_result->i_ea_mode && de->read_only) 279 result->i_mode &= ~0222; 280 if (!de->directory) { 281 if (result->i_size == -1) { 282 result->i_size = le32_to_cpu(de->file_size); 283 result->i_data.a_ops = &hpfs_aops; 284 hpfs_i(result)->mmu_private = result->i_size; 285 /* 286 * i_blocks should count the fnode and any anodes. 287 * We count 1 for the fnode and don't bother about 288 * anodes -- the disk heads are on the directory band 289 * and we want them to stay there. 290 */ 291 result->i_blocks = 1 + ((result->i_size + 511) >> 9); 292 } 293 } 294 } 295 296 hpfs_brelse4(&qbh); 297 298 /* 299 * Made it. 300 */ 301 302 end: 303 end_add: 304 hpfs_unlock(dir->i_sb); 305 d_add(dentry, result); 306 return NULL; 307 308 /* 309 * Didn't. 310 */ 311 bail1: 312 313 hpfs_brelse4(&qbh); 314 315 /*bail:*/ 316 317 hpfs_unlock(dir->i_sb); 318 return ERR_PTR(-ENOENT); 319 } 320 321 const struct file_operations hpfs_dir_ops = 322 { 323 .llseek = hpfs_dir_lseek, 324 .read = generic_read_dir, 325 .readdir = hpfs_readdir, 326 .release = hpfs_dir_release, 327 .fsync = hpfs_file_fsync, 328 }; 329