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