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 inode_lock(i); 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 if (unlikely(hpfs_add_pos(i, &filp->f_pos) < 0)) { 48 hpfs_unlock(s); 49 inode_unlock(i); 50 return -ENOMEM; 51 } 52 ok: 53 filp->f_pos = new_off; 54 hpfs_unlock(s); 55 inode_unlock(i); 56 return new_off; 57 fail: 58 /*pr_warn("illegal lseek: %016llx\n", new_off);*/ 59 hpfs_unlock(s); 60 inode_unlock(i); 61 return -ESPIPE; 62 } 63 64 static int hpfs_readdir(struct file *file, struct dir_context *ctx) 65 { 66 struct inode *inode = file_inode(file); 67 struct hpfs_inode_info *hpfs_inode = hpfs_i(inode); 68 struct quad_buffer_head qbh; 69 struct hpfs_dirent *de; 70 int lc; 71 loff_t next_pos; 72 unsigned char *tempname; 73 int c1, c2 = 0; 74 int ret = 0; 75 76 hpfs_lock(inode->i_sb); 77 78 if (hpfs_sb(inode->i_sb)->sb_chk) { 79 if (hpfs_chk_sectors(inode->i_sb, inode->i_ino, 1, "dir_fnode")) { 80 ret = -EFSERROR; 81 goto out; 82 } 83 if (hpfs_chk_sectors(inode->i_sb, hpfs_inode->i_dno, 4, "dir_dnode")) { 84 ret = -EFSERROR; 85 goto out; 86 } 87 } 88 if (hpfs_sb(inode->i_sb)->sb_chk >= 2) { 89 struct buffer_head *bh; 90 struct fnode *fno; 91 int e = 0; 92 if (!(fno = hpfs_map_fnode(inode->i_sb, inode->i_ino, &bh))) { 93 ret = -EIOERROR; 94 goto out; 95 } 96 if (!fnode_is_dir(fno)) { 97 e = 1; 98 hpfs_error(inode->i_sb, "not a directory, fnode %08lx", 99 (unsigned long)inode->i_ino); 100 } 101 if (hpfs_inode->i_dno != le32_to_cpu(fno->u.external[0].disk_secno)) { 102 e = 1; 103 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)); 104 } 105 brelse(bh); 106 if (e) { 107 ret = -EFSERROR; 108 goto out; 109 } 110 } 111 lc = hpfs_sb(inode->i_sb)->sb_lowercase; 112 if (ctx->pos == 12) { /* diff -r requires this (note, that diff -r */ 113 ctx->pos = 13; /* also fails on msdos filesystem in 2.0) */ 114 goto out; 115 } 116 if (ctx->pos == 13) { 117 ret = -ENOENT; 118 goto out; 119 } 120 121 while (1) { 122 again: 123 /* This won't work when cycle is longer than number of dirents 124 accepted by filldir, but what can I do? 125 maybe killall -9 ls helps */ 126 if (hpfs_sb(inode->i_sb)->sb_chk) 127 if (hpfs_stop_cycles(inode->i_sb, ctx->pos, &c1, &c2, "hpfs_readdir")) { 128 ret = -EFSERROR; 129 goto out; 130 } 131 if (ctx->pos == 12) 132 goto out; 133 if (ctx->pos == 3 || ctx->pos == 4 || ctx->pos == 5) { 134 pr_err("pos==%d\n", (int)ctx->pos); 135 goto out; 136 } 137 if (ctx->pos == 0) { 138 if (!dir_emit_dot(file, ctx)) 139 goto out; 140 ctx->pos = 11; 141 } 142 if (ctx->pos == 11) { 143 if (!dir_emit(ctx, "..", 2, hpfs_inode->i_parent_dir, DT_DIR)) 144 goto out; 145 ctx->pos = 1; 146 } 147 if (ctx->pos == 1) { 148 ret = hpfs_add_pos(inode, &file->f_pos); 149 if (unlikely(ret < 0)) 150 goto out; 151 ctx->pos = ((loff_t) hpfs_de_as_down_as_possible(inode->i_sb, hpfs_inode->i_dno) << 4) + 1; 152 file->f_version = inode->i_version; 153 } 154 next_pos = ctx->pos; 155 if (!(de = map_pos_dirent(inode, &next_pos, &qbh))) { 156 ctx->pos = next_pos; 157 ret = -EIOERROR; 158 goto out; 159 } 160 if (de->first || de->last) { 161 if (hpfs_sb(inode->i_sb)->sb_chk) { 162 if (de->first && !de->last && (de->namelen != 2 163 || de ->name[0] != 1 || de->name[1] != 1)) 164 hpfs_error(inode->i_sb, "hpfs_readdir: bad ^A^A entry; pos = %08lx", (unsigned long)ctx->pos); 165 if (de->last && (de->namelen != 1 || de ->name[0] != 255)) 166 hpfs_error(inode->i_sb, "hpfs_readdir: bad \\377 entry; pos = %08lx", (unsigned long)ctx->pos); 167 } 168 hpfs_brelse4(&qbh); 169 ctx->pos = next_pos; 170 goto again; 171 } 172 tempname = hpfs_translate_name(inode->i_sb, de->name, de->namelen, lc, de->not_8x3); 173 if (!dir_emit(ctx, tempname, de->namelen, le32_to_cpu(de->fnode), DT_UNKNOWN)) { 174 if (tempname != de->name) kfree(tempname); 175 hpfs_brelse4(&qbh); 176 goto out; 177 } 178 ctx->pos = next_pos; 179 if (tempname != de->name) kfree(tempname); 180 hpfs_brelse4(&qbh); 181 } 182 out: 183 hpfs_unlock(inode->i_sb); 184 return ret; 185 } 186 187 /* 188 * lookup. Search the specified directory for the specified name, set 189 * *result to the corresponding inode. 190 * 191 * lookup uses the inode number to tell read_inode whether it is reading 192 * the inode of a directory or a file -- file ino's are odd, directory 193 * ino's are even. read_inode avoids i/o for file inodes; everything 194 * needed is up here in the directory. (And file fnodes are out in 195 * the boondocks.) 196 * 197 * - M.P.: this is over, sometimes we've got to read file's fnode for eas 198 * inode numbers are just fnode sector numbers; iget lock is used 199 * to tell read_inode to read fnode or not. 200 */ 201 202 struct dentry *hpfs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) 203 { 204 const unsigned char *name = dentry->d_name.name; 205 unsigned len = dentry->d_name.len; 206 struct quad_buffer_head qbh; 207 struct hpfs_dirent *de; 208 ino_t ino; 209 int err; 210 struct inode *result = NULL; 211 struct hpfs_inode_info *hpfs_result; 212 213 hpfs_lock(dir->i_sb); 214 if ((err = hpfs_chk_name(name, &len))) { 215 if (err == -ENAMETOOLONG) { 216 hpfs_unlock(dir->i_sb); 217 return ERR_PTR(-ENAMETOOLONG); 218 } 219 goto end_add; 220 } 221 222 /* 223 * '.' and '..' will never be passed here. 224 */ 225 226 de = map_dirent(dir, hpfs_i(dir)->i_dno, name, len, NULL, &qbh); 227 228 /* 229 * This is not really a bailout, just means file not found. 230 */ 231 232 if (!de) goto end; 233 234 /* 235 * Get inode number, what we're after. 236 */ 237 238 ino = le32_to_cpu(de->fnode); 239 240 /* 241 * Go find or make an inode. 242 */ 243 244 result = iget_locked(dir->i_sb, ino); 245 if (!result) { 246 hpfs_error(dir->i_sb, "hpfs_lookup: can't get inode"); 247 goto bail1; 248 } 249 if (result->i_state & I_NEW) { 250 hpfs_init_inode(result); 251 if (de->directory) 252 hpfs_read_inode(result); 253 else if (le32_to_cpu(de->ea_size) && hpfs_sb(dir->i_sb)->sb_eas) 254 hpfs_read_inode(result); 255 else { 256 result->i_mode |= S_IFREG; 257 result->i_mode &= ~0111; 258 result->i_op = &hpfs_file_iops; 259 result->i_fop = &hpfs_file_ops; 260 set_nlink(result, 1); 261 } 262 unlock_new_inode(result); 263 } 264 hpfs_result = hpfs_i(result); 265 if (!de->directory) hpfs_result->i_parent_dir = dir->i_ino; 266 267 if (de->has_acl || de->has_xtd_perm) if (!sb_rdonly(dir->i_sb)) { 268 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"); 269 goto bail1; 270 } 271 272 /* 273 * Fill in the info from the directory if this is a newly created 274 * inode. 275 */ 276 277 if (!result->i_ctime.tv_sec) { 278 if (!(result->i_ctime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(de->creation_date)))) 279 result->i_ctime.tv_sec = 1; 280 result->i_ctime.tv_nsec = 0; 281 result->i_mtime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(de->write_date)); 282 result->i_mtime.tv_nsec = 0; 283 result->i_atime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(de->read_date)); 284 result->i_atime.tv_nsec = 0; 285 hpfs_result->i_ea_size = le32_to_cpu(de->ea_size); 286 if (!hpfs_result->i_ea_mode && de->read_only) 287 result->i_mode &= ~0222; 288 if (!de->directory) { 289 if (result->i_size == -1) { 290 result->i_size = le32_to_cpu(de->file_size); 291 result->i_data.a_ops = &hpfs_aops; 292 hpfs_i(result)->mmu_private = result->i_size; 293 /* 294 * i_blocks should count the fnode and any anodes. 295 * We count 1 for the fnode and don't bother about 296 * anodes -- the disk heads are on the directory band 297 * and we want them to stay there. 298 */ 299 result->i_blocks = 1 + ((result->i_size + 511) >> 9); 300 } 301 } 302 } 303 304 hpfs_brelse4(&qbh); 305 306 /* 307 * Made it. 308 */ 309 310 end: 311 end_add: 312 hpfs_unlock(dir->i_sb); 313 d_add(dentry, result); 314 return NULL; 315 316 /* 317 * Didn't. 318 */ 319 bail1: 320 321 hpfs_brelse4(&qbh); 322 323 /*bail:*/ 324 325 hpfs_unlock(dir->i_sb); 326 return ERR_PTR(-ENOENT); 327 } 328 329 const struct file_operations hpfs_dir_ops = 330 { 331 .llseek = hpfs_dir_lseek, 332 .read = generic_read_dir, 333 .iterate_shared = hpfs_readdir, 334 .release = hpfs_dir_release, 335 .fsync = hpfs_file_fsync, 336 .unlocked_ioctl = hpfs_ioctl, 337 }; 338