1 /* 2 * (C) 2001 Clemson University and The University of Chicago 3 * 4 * See COPYING in top-level directory. 5 */ 6 7 /* 8 * Linux VFS namei operations. 9 */ 10 11 #include "protocol.h" 12 #include "orangefs-kernel.h" 13 14 /* 15 * Get a newly allocated inode to go with a negative dentry. 16 */ 17 static int orangefs_create(struct inode *dir, 18 struct dentry *dentry, 19 umode_t mode, 20 bool exclusive) 21 { 22 struct orangefs_inode_s *parent = ORANGEFS_I(dir); 23 struct orangefs_kernel_op_s *new_op; 24 struct inode *inode; 25 int ret; 26 27 gossip_debug(GOSSIP_NAME_DEBUG, "%s: %s\n", 28 __func__, 29 dentry->d_name.name); 30 31 new_op = op_alloc(ORANGEFS_VFS_OP_CREATE); 32 if (!new_op) 33 return -ENOMEM; 34 35 new_op->upcall.req.create.parent_refn = parent->refn; 36 37 fill_default_sys_attrs(new_op->upcall.req.create.attributes, 38 ORANGEFS_TYPE_METAFILE, mode); 39 40 strncpy(new_op->upcall.req.create.d_name, 41 dentry->d_name.name, ORANGEFS_NAME_MAX); 42 43 ret = service_operation(new_op, __func__, get_interruptible_flag(dir)); 44 45 gossip_debug(GOSSIP_NAME_DEBUG, 46 "%s: %s: handle:%pU: fsid:%d: new_op:%p: ret:%d:\n", 47 __func__, 48 dentry->d_name.name, 49 &new_op->downcall.resp.create.refn.khandle, 50 new_op->downcall.resp.create.refn.fs_id, 51 new_op, 52 ret); 53 54 if (ret < 0) 55 goto out; 56 57 inode = orangefs_new_inode(dir->i_sb, dir, S_IFREG | mode, 0, 58 &new_op->downcall.resp.create.refn); 59 if (IS_ERR(inode)) { 60 gossip_err("%s: Failed to allocate inode for file :%s:\n", 61 __func__, 62 dentry->d_name.name); 63 ret = PTR_ERR(inode); 64 goto out; 65 } 66 67 gossip_debug(GOSSIP_NAME_DEBUG, 68 "%s: Assigned inode :%pU: for file :%s:\n", 69 __func__, 70 get_khandle_from_ino(inode), 71 dentry->d_name.name); 72 73 d_instantiate(dentry, inode); 74 unlock_new_inode(inode); 75 76 gossip_debug(GOSSIP_NAME_DEBUG, 77 "%s: dentry instantiated for %s\n", 78 __func__, 79 dentry->d_name.name); 80 81 SetMtimeFlag(parent); 82 dir->i_mtime = dir->i_ctime = current_fs_time(dir->i_sb); 83 mark_inode_dirty_sync(dir); 84 ret = 0; 85 out: 86 op_release(new_op); 87 gossip_debug(GOSSIP_NAME_DEBUG, 88 "%s: %s: returning %d\n", 89 __func__, 90 dentry->d_name.name, 91 ret); 92 return ret; 93 } 94 95 /* 96 * Attempt to resolve an object name (dentry->d_name), parent handle, and 97 * fsid into a handle for the object. 98 */ 99 static struct dentry *orangefs_lookup(struct inode *dir, struct dentry *dentry, 100 unsigned int flags) 101 { 102 struct orangefs_inode_s *parent = ORANGEFS_I(dir); 103 struct orangefs_kernel_op_s *new_op; 104 struct inode *inode; 105 struct dentry *res; 106 int ret = -EINVAL; 107 108 /* 109 * in theory we could skip a lookup here (if the intent is to 110 * create) in order to avoid a potentially failed lookup, but 111 * leaving it in can skip a valid lookup and try to create a file 112 * that already exists (e.g. the vfs already handles checking for 113 * -EEXIST on O_EXCL opens, which is broken if we skip this lookup 114 * in the create path) 115 */ 116 gossip_debug(GOSSIP_NAME_DEBUG, "%s called on %s\n", 117 __func__, dentry->d_name.name); 118 119 if (dentry->d_name.len > (ORANGEFS_NAME_MAX - 1)) 120 return ERR_PTR(-ENAMETOOLONG); 121 122 new_op = op_alloc(ORANGEFS_VFS_OP_LOOKUP); 123 if (!new_op) 124 return ERR_PTR(-ENOMEM); 125 126 new_op->upcall.req.lookup.sym_follow = ORANGEFS_LOOKUP_LINK_NO_FOLLOW; 127 128 gossip_debug(GOSSIP_NAME_DEBUG, "%s:%s:%d using parent %pU\n", 129 __FILE__, 130 __func__, 131 __LINE__, 132 &parent->refn.khandle); 133 new_op->upcall.req.lookup.parent_refn = parent->refn; 134 135 strncpy(new_op->upcall.req.lookup.d_name, dentry->d_name.name, 136 ORANGEFS_NAME_MAX); 137 138 gossip_debug(GOSSIP_NAME_DEBUG, 139 "%s: doing lookup on %s under %pU,%d\n", 140 __func__, 141 new_op->upcall.req.lookup.d_name, 142 &new_op->upcall.req.lookup.parent_refn.khandle, 143 new_op->upcall.req.lookup.parent_refn.fs_id); 144 145 ret = service_operation(new_op, __func__, get_interruptible_flag(dir)); 146 147 gossip_debug(GOSSIP_NAME_DEBUG, 148 "Lookup Got %pU, fsid %d (ret=%d)\n", 149 &new_op->downcall.resp.lookup.refn.khandle, 150 new_op->downcall.resp.lookup.refn.fs_id, 151 ret); 152 153 if (ret < 0) { 154 if (ret == -ENOENT) { 155 /* 156 * if no inode was found, add a negative dentry to 157 * dcache anyway; if we don't, we don't hold expected 158 * lookup semantics and we most noticeably break 159 * during directory renames. 160 * 161 * however, if the operation failed or exited, do not 162 * add the dentry (e.g. in the case that a touch is 163 * issued on a file that already exists that was 164 * interrupted during this lookup -- no need to add 165 * another negative dentry for an existing file) 166 */ 167 168 gossip_debug(GOSSIP_NAME_DEBUG, 169 "orangefs_lookup: Adding *negative* dentry " 170 "%p for %s\n", 171 dentry, 172 dentry->d_name.name); 173 174 d_add(dentry, NULL); 175 res = NULL; 176 goto out; 177 } 178 179 /* must be a non-recoverable error */ 180 res = ERR_PTR(ret); 181 goto out; 182 } 183 184 inode = orangefs_iget(dir->i_sb, &new_op->downcall.resp.lookup.refn); 185 if (IS_ERR(inode)) { 186 gossip_debug(GOSSIP_NAME_DEBUG, 187 "error %ld from iget\n", PTR_ERR(inode)); 188 res = ERR_CAST(inode); 189 goto out; 190 } 191 192 gossip_debug(GOSSIP_NAME_DEBUG, 193 "%s:%s:%d " 194 "Found good inode [%lu] with count [%d]\n", 195 __FILE__, 196 __func__, 197 __LINE__, 198 inode->i_ino, 199 (int)atomic_read(&inode->i_count)); 200 201 /* update dentry/inode pair into dcache */ 202 res = d_splice_alias(inode, dentry); 203 204 gossip_debug(GOSSIP_NAME_DEBUG, 205 "Lookup success (inode ct = %d)\n", 206 (int)atomic_read(&inode->i_count)); 207 out: 208 op_release(new_op); 209 return res; 210 } 211 212 /* return 0 on success; non-zero otherwise */ 213 static int orangefs_unlink(struct inode *dir, struct dentry *dentry) 214 { 215 struct inode *inode = dentry->d_inode; 216 struct orangefs_inode_s *parent = ORANGEFS_I(dir); 217 struct orangefs_kernel_op_s *new_op; 218 int ret; 219 220 gossip_debug(GOSSIP_NAME_DEBUG, 221 "%s: called on %s\n" 222 " (inode %pU): Parent is %pU | fs_id %d\n", 223 __func__, 224 dentry->d_name.name, 225 get_khandle_from_ino(inode), 226 &parent->refn.khandle, 227 parent->refn.fs_id); 228 229 new_op = op_alloc(ORANGEFS_VFS_OP_REMOVE); 230 if (!new_op) 231 return -ENOMEM; 232 233 new_op->upcall.req.remove.parent_refn = parent->refn; 234 strncpy(new_op->upcall.req.remove.d_name, dentry->d_name.name, 235 ORANGEFS_NAME_MAX); 236 237 ret = service_operation(new_op, "orangefs_unlink", 238 get_interruptible_flag(inode)); 239 240 gossip_debug(GOSSIP_NAME_DEBUG, 241 "%s: service_operation returned:%d:\n", 242 __func__, 243 ret); 244 245 op_release(new_op); 246 247 if (!ret) { 248 drop_nlink(inode); 249 250 SetMtimeFlag(parent); 251 dir->i_mtime = dir->i_ctime = current_fs_time(dir->i_sb); 252 mark_inode_dirty_sync(dir); 253 } 254 return ret; 255 } 256 257 static int orangefs_symlink(struct inode *dir, 258 struct dentry *dentry, 259 const char *symname) 260 { 261 struct orangefs_inode_s *parent = ORANGEFS_I(dir); 262 struct orangefs_kernel_op_s *new_op; 263 struct inode *inode; 264 int mode = 755; 265 int ret; 266 267 gossip_debug(GOSSIP_NAME_DEBUG, "%s: called\n", __func__); 268 269 if (!symname) 270 return -EINVAL; 271 272 if (strlen(symname)+1 > ORANGEFS_NAME_MAX) 273 return -ENAMETOOLONG; 274 275 new_op = op_alloc(ORANGEFS_VFS_OP_SYMLINK); 276 if (!new_op) 277 return -ENOMEM; 278 279 new_op->upcall.req.sym.parent_refn = parent->refn; 280 281 fill_default_sys_attrs(new_op->upcall.req.sym.attributes, 282 ORANGEFS_TYPE_SYMLINK, 283 mode); 284 285 strncpy(new_op->upcall.req.sym.entry_name, 286 dentry->d_name.name, 287 ORANGEFS_NAME_MAX); 288 strncpy(new_op->upcall.req.sym.target, symname, ORANGEFS_NAME_MAX); 289 290 ret = service_operation(new_op, __func__, get_interruptible_flag(dir)); 291 292 gossip_debug(GOSSIP_NAME_DEBUG, 293 "Symlink Got ORANGEFS handle %pU on fsid %d (ret=%d)\n", 294 &new_op->downcall.resp.sym.refn.khandle, 295 new_op->downcall.resp.sym.refn.fs_id, ret); 296 297 if (ret < 0) { 298 gossip_debug(GOSSIP_NAME_DEBUG, 299 "%s: failed with error code %d\n", 300 __func__, ret); 301 goto out; 302 } 303 304 inode = orangefs_new_inode(dir->i_sb, dir, S_IFLNK | mode, 0, 305 &new_op->downcall.resp.sym.refn); 306 if (IS_ERR(inode)) { 307 gossip_err 308 ("*** Failed to allocate orangefs symlink inode\n"); 309 ret = PTR_ERR(inode); 310 goto out; 311 } 312 313 gossip_debug(GOSSIP_NAME_DEBUG, 314 "Assigned symlink inode new number of %pU\n", 315 get_khandle_from_ino(inode)); 316 317 d_instantiate(dentry, inode); 318 unlock_new_inode(inode); 319 320 gossip_debug(GOSSIP_NAME_DEBUG, 321 "Inode (Symlink) %pU -> %s\n", 322 get_khandle_from_ino(inode), 323 dentry->d_name.name); 324 325 SetMtimeFlag(parent); 326 dir->i_mtime = dir->i_ctime = current_fs_time(dir->i_sb); 327 mark_inode_dirty_sync(dir); 328 ret = 0; 329 out: 330 op_release(new_op); 331 return ret; 332 } 333 334 static int orangefs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 335 { 336 struct orangefs_inode_s *parent = ORANGEFS_I(dir); 337 struct orangefs_kernel_op_s *new_op; 338 struct inode *inode; 339 int ret; 340 341 new_op = op_alloc(ORANGEFS_VFS_OP_MKDIR); 342 if (!new_op) 343 return -ENOMEM; 344 345 new_op->upcall.req.mkdir.parent_refn = parent->refn; 346 347 fill_default_sys_attrs(new_op->upcall.req.mkdir.attributes, 348 ORANGEFS_TYPE_DIRECTORY, mode); 349 350 strncpy(new_op->upcall.req.mkdir.d_name, 351 dentry->d_name.name, ORANGEFS_NAME_MAX); 352 353 ret = service_operation(new_op, __func__, get_interruptible_flag(dir)); 354 355 gossip_debug(GOSSIP_NAME_DEBUG, 356 "Mkdir Got ORANGEFS handle %pU on fsid %d\n", 357 &new_op->downcall.resp.mkdir.refn.khandle, 358 new_op->downcall.resp.mkdir.refn.fs_id); 359 360 if (ret < 0) { 361 gossip_debug(GOSSIP_NAME_DEBUG, 362 "%s: failed with error code %d\n", 363 __func__, ret); 364 goto out; 365 } 366 367 inode = orangefs_new_inode(dir->i_sb, dir, S_IFDIR | mode, 0, 368 &new_op->downcall.resp.mkdir.refn); 369 if (IS_ERR(inode)) { 370 gossip_err("*** Failed to allocate orangefs dir inode\n"); 371 ret = PTR_ERR(inode); 372 goto out; 373 } 374 375 gossip_debug(GOSSIP_NAME_DEBUG, 376 "Assigned dir inode new number of %pU\n", 377 get_khandle_from_ino(inode)); 378 379 d_instantiate(dentry, inode); 380 unlock_new_inode(inode); 381 382 gossip_debug(GOSSIP_NAME_DEBUG, 383 "Inode (Directory) %pU -> %s\n", 384 get_khandle_from_ino(inode), 385 dentry->d_name.name); 386 387 /* 388 * NOTE: we have no good way to keep nlink consistent for directories 389 * across clients; keep constant at 1. 390 */ 391 SetMtimeFlag(parent); 392 dir->i_mtime = dir->i_ctime = current_fs_time(dir->i_sb); 393 mark_inode_dirty_sync(dir); 394 out: 395 op_release(new_op); 396 return ret; 397 } 398 399 static int orangefs_rename(struct inode *old_dir, 400 struct dentry *old_dentry, 401 struct inode *new_dir, 402 struct dentry *new_dentry) 403 { 404 struct orangefs_kernel_op_s *new_op; 405 int ret; 406 407 gossip_debug(GOSSIP_NAME_DEBUG, 408 "orangefs_rename: called (%s/%s => %s/%s) ct=%d\n", 409 old_dentry->d_parent->d_name.name, 410 old_dentry->d_name.name, 411 new_dentry->d_parent->d_name.name, 412 new_dentry->d_name.name, 413 d_count(new_dentry)); 414 415 new_op = op_alloc(ORANGEFS_VFS_OP_RENAME); 416 if (!new_op) 417 return -EINVAL; 418 419 new_op->upcall.req.rename.old_parent_refn = ORANGEFS_I(old_dir)->refn; 420 new_op->upcall.req.rename.new_parent_refn = ORANGEFS_I(new_dir)->refn; 421 422 strncpy(new_op->upcall.req.rename.d_old_name, 423 old_dentry->d_name.name, 424 ORANGEFS_NAME_MAX); 425 strncpy(new_op->upcall.req.rename.d_new_name, 426 new_dentry->d_name.name, 427 ORANGEFS_NAME_MAX); 428 429 ret = service_operation(new_op, 430 "orangefs_rename", 431 get_interruptible_flag(old_dentry->d_inode)); 432 433 gossip_debug(GOSSIP_NAME_DEBUG, 434 "orangefs_rename: got downcall status %d\n", 435 ret); 436 437 if (new_dentry->d_inode) 438 new_dentry->d_inode->i_ctime = CURRENT_TIME; 439 440 op_release(new_op); 441 return ret; 442 } 443 444 /* ORANGEFS implementation of VFS inode operations for directories */ 445 struct inode_operations orangefs_dir_inode_operations = { 446 .lookup = orangefs_lookup, 447 .get_acl = orangefs_get_acl, 448 .set_acl = orangefs_set_acl, 449 .create = orangefs_create, 450 .unlink = orangefs_unlink, 451 .symlink = orangefs_symlink, 452 .mkdir = orangefs_mkdir, 453 .rmdir = orangefs_unlink, 454 .rename = orangefs_rename, 455 .setattr = orangefs_setattr, 456 .getattr = orangefs_getattr, 457 .setxattr = generic_setxattr, 458 .getxattr = generic_getxattr, 459 .removexattr = generic_removexattr, 460 .listxattr = orangefs_listxattr, 461 .permission = orangefs_permission, 462 }; 463