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 <linux/slab.h> 11 #include "hpfs_fn.h" 12 13 static int hpfs_dir_release(struct inode *inode, struct file *filp) 14 { 15 lock_kernel(); 16 hpfs_del_pos(inode, &filp->f_pos); 17 /*hpfs_write_if_changed(inode);*/ 18 unlock_kernel(); 19 return 0; 20 } 21 22 /* This is slow, but it's not used often */ 23 24 static loff_t hpfs_dir_lseek(struct file *filp, loff_t off, int whence) 25 { 26 loff_t new_off = off + (whence == 1 ? filp->f_pos : 0); 27 loff_t pos; 28 struct quad_buffer_head qbh; 29 struct inode *i = filp->f_path.dentry->d_inode; 30 struct hpfs_inode_info *hpfs_inode = hpfs_i(i); 31 struct super_block *s = i->i_sb; 32 33 lock_kernel(); 34 35 /*printk("dir lseek\n");*/ 36 if (new_off == 0 || new_off == 1 || new_off == 11 || new_off == 12 || new_off == 13) goto ok; 37 mutex_lock(&i->i_mutex); 38 pos = ((loff_t) hpfs_de_as_down_as_possible(s, hpfs_inode->i_dno) << 4) + 1; 39 while (pos != new_off) { 40 if (map_pos_dirent(i, &pos, &qbh)) hpfs_brelse4(&qbh); 41 else goto fail; 42 if (pos == 12) goto fail; 43 } 44 mutex_unlock(&i->i_mutex); 45 ok: 46 unlock_kernel(); 47 return filp->f_pos = new_off; 48 fail: 49 mutex_unlock(&i->i_mutex); 50 /*printk("illegal lseek: %016llx\n", new_off);*/ 51 unlock_kernel(); 52 return -ESPIPE; 53 } 54 55 static int hpfs_readdir(struct file *filp, void *dirent, filldir_t filldir) 56 { 57 struct inode *inode = filp->f_path.dentry->d_inode; 58 struct hpfs_inode_info *hpfs_inode = hpfs_i(inode); 59 struct quad_buffer_head qbh; 60 struct hpfs_dirent *de; 61 int lc; 62 long old_pos; 63 unsigned char *tempname; 64 int c1, c2 = 0; 65 int ret = 0; 66 67 lock_kernel(); 68 69 if (hpfs_sb(inode->i_sb)->sb_chk) { 70 if (hpfs_chk_sectors(inode->i_sb, inode->i_ino, 1, "dir_fnode")) { 71 ret = -EFSERROR; 72 goto out; 73 } 74 if (hpfs_chk_sectors(inode->i_sb, hpfs_inode->i_dno, 4, "dir_dnode")) { 75 ret = -EFSERROR; 76 goto out; 77 } 78 } 79 if (hpfs_sb(inode->i_sb)->sb_chk >= 2) { 80 struct buffer_head *bh; 81 struct fnode *fno; 82 int e = 0; 83 if (!(fno = hpfs_map_fnode(inode->i_sb, inode->i_ino, &bh))) { 84 ret = -EIOERROR; 85 goto out; 86 } 87 if (!fno->dirflag) { 88 e = 1; 89 hpfs_error(inode->i_sb, "not a directory, fnode %08lx", 90 (unsigned long)inode->i_ino); 91 } 92 if (hpfs_inode->i_dno != fno->u.external[0].disk_secno) { 93 e = 1; 94 hpfs_error(inode->i_sb, "corrupted inode: i_dno == %08x, fnode -> dnode == %08x", hpfs_inode->i_dno, fno->u.external[0].disk_secno); 95 } 96 brelse(bh); 97 if (e) { 98 ret = -EFSERROR; 99 goto out; 100 } 101 } 102 lc = hpfs_sb(inode->i_sb)->sb_lowercase; 103 if (filp->f_pos == 12) { /* diff -r requires this (note, that diff -r */ 104 filp->f_pos = 13; /* also fails on msdos filesystem in 2.0) */ 105 goto out; 106 } 107 if (filp->f_pos == 13) { 108 ret = -ENOENT; 109 goto out; 110 } 111 112 while (1) { 113 again: 114 /* This won't work when cycle is longer than number of dirents 115 accepted by filldir, but what can I do? 116 maybe killall -9 ls helps */ 117 if (hpfs_sb(inode->i_sb)->sb_chk) 118 if (hpfs_stop_cycles(inode->i_sb, filp->f_pos, &c1, &c2, "hpfs_readdir")) { 119 ret = -EFSERROR; 120 goto out; 121 } 122 if (filp->f_pos == 12) 123 goto out; 124 if (filp->f_pos == 3 || filp->f_pos == 4 || filp->f_pos == 5) { 125 printk("HPFS: warning: pos==%d\n",(int)filp->f_pos); 126 goto out; 127 } 128 if (filp->f_pos == 0) { 129 if (filldir(dirent, ".", 1, filp->f_pos, inode->i_ino, DT_DIR) < 0) 130 goto out; 131 filp->f_pos = 11; 132 } 133 if (filp->f_pos == 11) { 134 if (filldir(dirent, "..", 2, filp->f_pos, hpfs_inode->i_parent_dir, DT_DIR) < 0) 135 goto out; 136 filp->f_pos = 1; 137 } 138 if (filp->f_pos == 1) { 139 filp->f_pos = ((loff_t) hpfs_de_as_down_as_possible(inode->i_sb, hpfs_inode->i_dno) << 4) + 1; 140 hpfs_add_pos(inode, &filp->f_pos); 141 filp->f_version = inode->i_version; 142 } 143 old_pos = filp->f_pos; 144 if (!(de = map_pos_dirent(inode, &filp->f_pos, &qbh))) { 145 ret = -EIOERROR; 146 goto out; 147 } 148 if (de->first || de->last) { 149 if (hpfs_sb(inode->i_sb)->sb_chk) { 150 if (de->first && !de->last && (de->namelen != 2 151 || de ->name[0] != 1 || de->name[1] != 1)) 152 hpfs_error(inode->i_sb, "hpfs_readdir: bad ^A^A entry; pos = %08lx", old_pos); 153 if (de->last && (de->namelen != 1 || de ->name[0] != 255)) 154 hpfs_error(inode->i_sb, "hpfs_readdir: bad \\377 entry; pos = %08lx", old_pos); 155 } 156 hpfs_brelse4(&qbh); 157 goto again; 158 } 159 tempname = hpfs_translate_name(inode->i_sb, de->name, de->namelen, lc, de->not_8x3); 160 if (filldir(dirent, tempname, de->namelen, old_pos, de->fnode, DT_UNKNOWN) < 0) { 161 filp->f_pos = old_pos; 162 if (tempname != de->name) kfree(tempname); 163 hpfs_brelse4(&qbh); 164 goto out; 165 } 166 if (tempname != de->name) kfree(tempname); 167 hpfs_brelse4(&qbh); 168 } 169 out: 170 unlock_kernel(); 171 return ret; 172 } 173 174 /* 175 * lookup. Search the specified directory for the specified name, set 176 * *result to the corresponding inode. 177 * 178 * lookup uses the inode number to tell read_inode whether it is reading 179 * the inode of a directory or a file -- file ino's are odd, directory 180 * ino's are even. read_inode avoids i/o for file inodes; everything 181 * needed is up here in the directory. (And file fnodes are out in 182 * the boondocks.) 183 * 184 * - M.P.: this is over, sometimes we've got to read file's fnode for eas 185 * inode numbers are just fnode sector numbers; iget lock is used 186 * to tell read_inode to read fnode or not. 187 */ 188 189 struct dentry *hpfs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) 190 { 191 const unsigned char *name = dentry->d_name.name; 192 unsigned len = dentry->d_name.len; 193 struct quad_buffer_head qbh; 194 struct hpfs_dirent *de; 195 ino_t ino; 196 int err; 197 struct inode *result = NULL; 198 struct hpfs_inode_info *hpfs_result; 199 200 lock_kernel(); 201 if ((err = hpfs_chk_name(name, &len))) { 202 if (err == -ENAMETOOLONG) { 203 unlock_kernel(); 204 return ERR_PTR(-ENAMETOOLONG); 205 } 206 goto end_add; 207 } 208 209 /* 210 * '.' and '..' will never be passed here. 211 */ 212 213 de = map_dirent(dir, hpfs_i(dir)->i_dno, name, len, NULL, &qbh); 214 215 /* 216 * This is not really a bailout, just means file not found. 217 */ 218 219 if (!de) goto end; 220 221 /* 222 * Get inode number, what we're after. 223 */ 224 225 ino = de->fnode; 226 227 /* 228 * Go find or make an inode. 229 */ 230 231 result = iget_locked(dir->i_sb, ino); 232 if (!result) { 233 hpfs_error(dir->i_sb, "hpfs_lookup: can't get inode"); 234 goto bail1; 235 } 236 if (result->i_state & I_NEW) { 237 hpfs_init_inode(result); 238 if (de->directory) 239 hpfs_read_inode(result); 240 else if (de->ea_size && hpfs_sb(dir->i_sb)->sb_eas) 241 hpfs_read_inode(result); 242 else { 243 result->i_mode |= S_IFREG; 244 result->i_mode &= ~0111; 245 result->i_op = &hpfs_file_iops; 246 result->i_fop = &hpfs_file_ops; 247 result->i_nlink = 1; 248 } 249 unlock_new_inode(result); 250 } 251 hpfs_result = hpfs_i(result); 252 if (!de->directory) hpfs_result->i_parent_dir = dir->i_ino; 253 254 hpfs_decide_conv(result, name, len); 255 256 if (de->has_acl || de->has_xtd_perm) if (!(dir->i_sb->s_flags & MS_RDONLY)) { 257 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"); 258 goto bail1; 259 } 260 261 /* 262 * Fill in the info from the directory if this is a newly created 263 * inode. 264 */ 265 266 if (!result->i_ctime.tv_sec) { 267 if (!(result->i_ctime.tv_sec = local_to_gmt(dir->i_sb, de->creation_date))) 268 result->i_ctime.tv_sec = 1; 269 result->i_ctime.tv_nsec = 0; 270 result->i_mtime.tv_sec = local_to_gmt(dir->i_sb, de->write_date); 271 result->i_mtime.tv_nsec = 0; 272 result->i_atime.tv_sec = local_to_gmt(dir->i_sb, de->read_date); 273 result->i_atime.tv_nsec = 0; 274 hpfs_result->i_ea_size = de->ea_size; 275 if (!hpfs_result->i_ea_mode && de->read_only) 276 result->i_mode &= ~0222; 277 if (!de->directory) { 278 if (result->i_size == -1) { 279 result->i_size = de->file_size; 280 result->i_data.a_ops = &hpfs_aops; 281 hpfs_i(result)->mmu_private = result->i_size; 282 /* 283 * i_blocks should count the fnode and any anodes. 284 * We count 1 for the fnode and don't bother about 285 * anodes -- the disk heads are on the directory band 286 * and we want them to stay there. 287 */ 288 result->i_blocks = 1 + ((result->i_size + 511) >> 9); 289 } 290 } 291 } 292 293 hpfs_brelse4(&qbh); 294 295 /* 296 * Made it. 297 */ 298 299 end: 300 end_add: 301 hpfs_set_dentry_operations(dentry); 302 unlock_kernel(); 303 d_add(dentry, result); 304 return NULL; 305 306 /* 307 * Didn't. 308 */ 309 bail1: 310 311 hpfs_brelse4(&qbh); 312 313 /*bail:*/ 314 315 unlock_kernel(); 316 return ERR_PTR(-ENOENT); 317 } 318 319 const struct file_operations hpfs_dir_ops = 320 { 321 .llseek = hpfs_dir_lseek, 322 .read = generic_read_dir, 323 .readdir = hpfs_readdir, 324 .release = hpfs_dir_release, 325 .fsync = hpfs_file_fsync, 326 }; 327