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 /*pr_info("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 /*pr_warn("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 *file, struct dir_context *ctx) 61 { 62 struct inode *inode = file_inode(file); 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 loff_t next_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 (ctx->pos == 12) { /* diff -r requires this (note, that diff -r */ 109 ctx->pos = 13; /* also fails on msdos filesystem in 2.0) */ 110 goto out; 111 } 112 if (ctx->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, ctx->pos, &c1, &c2, "hpfs_readdir")) { 124 ret = -EFSERROR; 125 goto out; 126 } 127 if (ctx->pos == 12) 128 goto out; 129 if (ctx->pos == 3 || ctx->pos == 4 || ctx->pos == 5) { 130 pr_err("pos==%d\n", (int)ctx->pos); 131 goto out; 132 } 133 if (ctx->pos == 0) { 134 if (!dir_emit_dot(file, ctx)) 135 goto out; 136 ctx->pos = 11; 137 } 138 if (ctx->pos == 11) { 139 if (!dir_emit(ctx, "..", 2, hpfs_inode->i_parent_dir, DT_DIR)) 140 goto out; 141 ctx->pos = 1; 142 } 143 if (ctx->pos == 1) { 144 ctx->pos = ((loff_t) hpfs_de_as_down_as_possible(inode->i_sb, hpfs_inode->i_dno) << 4) + 1; 145 hpfs_add_pos(inode, &file->f_pos); 146 file->f_version = inode->i_version; 147 } 148 next_pos = ctx->pos; 149 if (!(de = map_pos_dirent(inode, &next_pos, &qbh))) { 150 ctx->pos = next_pos; 151 ret = -EIOERROR; 152 goto out; 153 } 154 if (de->first || de->last) { 155 if (hpfs_sb(inode->i_sb)->sb_chk) { 156 if (de->first && !de->last && (de->namelen != 2 157 || de ->name[0] != 1 || de->name[1] != 1)) 158 hpfs_error(inode->i_sb, "hpfs_readdir: bad ^A^A entry; pos = %08lx", (unsigned long)ctx->pos); 159 if (de->last && (de->namelen != 1 || de ->name[0] != 255)) 160 hpfs_error(inode->i_sb, "hpfs_readdir: bad \\377 entry; pos = %08lx", (unsigned long)ctx->pos); 161 } 162 hpfs_brelse4(&qbh); 163 ctx->pos = next_pos; 164 goto again; 165 } 166 tempname = hpfs_translate_name(inode->i_sb, de->name, de->namelen, lc, de->not_8x3); 167 if (!dir_emit(ctx, tempname, de->namelen, le32_to_cpu(de->fnode), DT_UNKNOWN)) { 168 if (tempname != de->name) kfree(tempname); 169 hpfs_brelse4(&qbh); 170 goto out; 171 } 172 ctx->pos = next_pos; 173 if (tempname != de->name) kfree(tempname); 174 hpfs_brelse4(&qbh); 175 } 176 out: 177 hpfs_unlock(inode->i_sb); 178 return ret; 179 } 180 181 /* 182 * lookup. Search the specified directory for the specified name, set 183 * *result to the corresponding inode. 184 * 185 * lookup uses the inode number to tell read_inode whether it is reading 186 * the inode of a directory or a file -- file ino's are odd, directory 187 * ino's are even. read_inode avoids i/o for file inodes; everything 188 * needed is up here in the directory. (And file fnodes are out in 189 * the boondocks.) 190 * 191 * - M.P.: this is over, sometimes we've got to read file's fnode for eas 192 * inode numbers are just fnode sector numbers; iget lock is used 193 * to tell read_inode to read fnode or not. 194 */ 195 196 struct dentry *hpfs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) 197 { 198 const unsigned char *name = dentry->d_name.name; 199 unsigned len = dentry->d_name.len; 200 struct quad_buffer_head qbh; 201 struct hpfs_dirent *de; 202 ino_t ino; 203 int err; 204 struct inode *result = NULL; 205 struct hpfs_inode_info *hpfs_result; 206 207 hpfs_lock(dir->i_sb); 208 if ((err = hpfs_chk_name(name, &len))) { 209 if (err == -ENAMETOOLONG) { 210 hpfs_unlock(dir->i_sb); 211 return ERR_PTR(-ENAMETOOLONG); 212 } 213 goto end_add; 214 } 215 216 /* 217 * '.' and '..' will never be passed here. 218 */ 219 220 de = map_dirent(dir, hpfs_i(dir)->i_dno, name, len, NULL, &qbh); 221 222 /* 223 * This is not really a bailout, just means file not found. 224 */ 225 226 if (!de) goto end; 227 228 /* 229 * Get inode number, what we're after. 230 */ 231 232 ino = le32_to_cpu(de->fnode); 233 234 /* 235 * Go find or make an inode. 236 */ 237 238 result = iget_locked(dir->i_sb, ino); 239 if (!result) { 240 hpfs_error(dir->i_sb, "hpfs_lookup: can't get inode"); 241 goto bail1; 242 } 243 if (result->i_state & I_NEW) { 244 hpfs_init_inode(result); 245 if (de->directory) 246 hpfs_read_inode(result); 247 else if (le32_to_cpu(de->ea_size) && hpfs_sb(dir->i_sb)->sb_eas) 248 hpfs_read_inode(result); 249 else { 250 result->i_mode |= S_IFREG; 251 result->i_mode &= ~0111; 252 result->i_op = &hpfs_file_iops; 253 result->i_fop = &hpfs_file_ops; 254 set_nlink(result, 1); 255 } 256 unlock_new_inode(result); 257 } 258 hpfs_result = hpfs_i(result); 259 if (!de->directory) hpfs_result->i_parent_dir = dir->i_ino; 260 261 if (de->has_acl || de->has_xtd_perm) if (!(dir->i_sb->s_flags & MS_RDONLY)) { 262 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"); 263 goto bail1; 264 } 265 266 /* 267 * Fill in the info from the directory if this is a newly created 268 * inode. 269 */ 270 271 if (!result->i_ctime.tv_sec) { 272 if (!(result->i_ctime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(de->creation_date)))) 273 result->i_ctime.tv_sec = 1; 274 result->i_ctime.tv_nsec = 0; 275 result->i_mtime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(de->write_date)); 276 result->i_mtime.tv_nsec = 0; 277 result->i_atime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(de->read_date)); 278 result->i_atime.tv_nsec = 0; 279 hpfs_result->i_ea_size = le32_to_cpu(de->ea_size); 280 if (!hpfs_result->i_ea_mode && de->read_only) 281 result->i_mode &= ~0222; 282 if (!de->directory) { 283 if (result->i_size == -1) { 284 result->i_size = le32_to_cpu(de->file_size); 285 result->i_data.a_ops = &hpfs_aops; 286 hpfs_i(result)->mmu_private = result->i_size; 287 /* 288 * i_blocks should count the fnode and any anodes. 289 * We count 1 for the fnode and don't bother about 290 * anodes -- the disk heads are on the directory band 291 * and we want them to stay there. 292 */ 293 result->i_blocks = 1 + ((result->i_size + 511) >> 9); 294 } 295 } 296 } 297 298 hpfs_brelse4(&qbh); 299 300 /* 301 * Made it. 302 */ 303 304 end: 305 end_add: 306 hpfs_unlock(dir->i_sb); 307 d_add(dentry, result); 308 return NULL; 309 310 /* 311 * Didn't. 312 */ 313 bail1: 314 315 hpfs_brelse4(&qbh); 316 317 /*bail:*/ 318 319 hpfs_unlock(dir->i_sb); 320 return ERR_PTR(-ENOENT); 321 } 322 323 const struct file_operations hpfs_dir_ops = 324 { 325 .llseek = hpfs_dir_lseek, 326 .read = generic_read_dir, 327 .iterate = hpfs_readdir, 328 .release = hpfs_dir_release, 329 .fsync = hpfs_file_fsync, 330 .unlocked_ioctl = hpfs_ioctl, 331 }; 332