1 #include <linux/ceph/ceph_debug.h> 2 3 #include <linux/spinlock.h> 4 #include <linux/fs_struct.h> 5 #include <linux/namei.h> 6 #include <linux/slab.h> 7 #include <linux/sched.h> 8 9 #include "super.h" 10 #include "mds_client.h" 11 12 /* 13 * Directory operations: readdir, lookup, create, link, unlink, 14 * rename, etc. 15 */ 16 17 /* 18 * Ceph MDS operations are specified in terms of a base ino and 19 * relative path. Thus, the client can specify an operation on a 20 * specific inode (e.g., a getattr due to fstat(2)), or as a path 21 * relative to, say, the root directory. 22 * 23 * Normally, we limit ourselves to strict inode ops (no path component) 24 * or dentry operations (a single path component relative to an ino). The 25 * exception to this is open_root_dentry(), which will open the mount 26 * point by name. 27 */ 28 29 const struct inode_operations ceph_dir_iops; 30 const struct file_operations ceph_dir_fops; 31 const struct dentry_operations ceph_dentry_ops; 32 33 /* 34 * Initialize ceph dentry state. 35 */ 36 int ceph_init_dentry(struct dentry *dentry) 37 { 38 struct ceph_dentry_info *di; 39 40 if (dentry->d_fsdata) 41 return 0; 42 43 if (dentry->d_parent == NULL || /* nfs fh_to_dentry */ 44 ceph_snap(dentry->d_parent->d_inode) == CEPH_NOSNAP) 45 d_set_d_op(dentry, &ceph_dentry_ops); 46 else if (ceph_snap(dentry->d_parent->d_inode) == CEPH_SNAPDIR) 47 d_set_d_op(dentry, &ceph_snapdir_dentry_ops); 48 else 49 d_set_d_op(dentry, &ceph_snap_dentry_ops); 50 51 di = kmem_cache_alloc(ceph_dentry_cachep, GFP_NOFS | __GFP_ZERO); 52 if (!di) 53 return -ENOMEM; /* oh well */ 54 55 spin_lock(&dentry->d_lock); 56 if (dentry->d_fsdata) { 57 /* lost a race */ 58 kmem_cache_free(ceph_dentry_cachep, di); 59 goto out_unlock; 60 } 61 di->dentry = dentry; 62 di->lease_session = NULL; 63 dentry->d_fsdata = di; 64 dentry->d_time = jiffies; 65 ceph_dentry_lru_add(dentry); 66 out_unlock: 67 spin_unlock(&dentry->d_lock); 68 return 0; 69 } 70 71 72 73 /* 74 * for readdir, we encode the directory frag and offset within that 75 * frag into f_pos. 76 */ 77 static unsigned fpos_frag(loff_t p) 78 { 79 return p >> 32; 80 } 81 static unsigned fpos_off(loff_t p) 82 { 83 return p & 0xffffffff; 84 } 85 86 /* 87 * When possible, we try to satisfy a readdir by peeking at the 88 * dcache. We make this work by carefully ordering dentries on 89 * d_u.d_child when we initially get results back from the MDS, and 90 * falling back to a "normal" sync readdir if any dentries in the dir 91 * are dropped. 92 * 93 * I_COMPLETE tells indicates we have all dentries in the dir. It is 94 * defined IFF we hold CEPH_CAP_FILE_SHARED (which will be revoked by 95 * the MDS if/when the directory is modified). 96 */ 97 static int __dcache_readdir(struct file *filp, 98 void *dirent, filldir_t filldir) 99 { 100 struct ceph_file_info *fi = filp->private_data; 101 struct dentry *parent = filp->f_dentry; 102 struct inode *dir = parent->d_inode; 103 struct list_head *p; 104 struct dentry *dentry, *last; 105 struct ceph_dentry_info *di; 106 int err = 0; 107 108 /* claim ref on last dentry we returned */ 109 last = fi->dentry; 110 fi->dentry = NULL; 111 112 dout("__dcache_readdir %p at %llu (last %p)\n", dir, filp->f_pos, 113 last); 114 115 spin_lock(&parent->d_lock); 116 117 /* start at beginning? */ 118 if (filp->f_pos == 2 || last == NULL || 119 filp->f_pos < ceph_dentry(last)->offset) { 120 if (list_empty(&parent->d_subdirs)) 121 goto out_unlock; 122 p = parent->d_subdirs.prev; 123 dout(" initial p %p/%p\n", p->prev, p->next); 124 } else { 125 p = last->d_u.d_child.prev; 126 } 127 128 more: 129 dentry = list_entry(p, struct dentry, d_u.d_child); 130 di = ceph_dentry(dentry); 131 while (1) { 132 dout(" p %p/%p %s d_subdirs %p/%p\n", p->prev, p->next, 133 d_unhashed(dentry) ? "!hashed" : "hashed", 134 parent->d_subdirs.prev, parent->d_subdirs.next); 135 if (p == &parent->d_subdirs) { 136 fi->at_end = 1; 137 goto out_unlock; 138 } 139 spin_lock_nested(&dentry->d_lock, DENTRY_D_LOCK_NESTED); 140 if (!d_unhashed(dentry) && dentry->d_inode && 141 ceph_snap(dentry->d_inode) != CEPH_SNAPDIR && 142 ceph_ino(dentry->d_inode) != CEPH_INO_CEPH && 143 filp->f_pos <= di->offset) 144 break; 145 dout(" skipping %p %.*s at %llu (%llu)%s%s\n", dentry, 146 dentry->d_name.len, dentry->d_name.name, di->offset, 147 filp->f_pos, d_unhashed(dentry) ? " unhashed" : "", 148 !dentry->d_inode ? " null" : ""); 149 spin_unlock(&dentry->d_lock); 150 p = p->prev; 151 dentry = list_entry(p, struct dentry, d_u.d_child); 152 di = ceph_dentry(dentry); 153 } 154 155 dget_dlock(dentry); 156 spin_unlock(&dentry->d_lock); 157 spin_unlock(&parent->d_lock); 158 159 dout(" %llu (%llu) dentry %p %.*s %p\n", di->offset, filp->f_pos, 160 dentry, dentry->d_name.len, dentry->d_name.name, dentry->d_inode); 161 filp->f_pos = di->offset; 162 err = filldir(dirent, dentry->d_name.name, 163 dentry->d_name.len, di->offset, 164 ceph_translate_ino(dentry->d_sb, dentry->d_inode->i_ino), 165 dentry->d_inode->i_mode >> 12); 166 167 if (last) { 168 if (err < 0) { 169 /* remember our position */ 170 fi->dentry = last; 171 fi->next_offset = di->offset; 172 } else { 173 dput(last); 174 } 175 } 176 last = dentry; 177 178 if (err < 0) 179 goto out; 180 181 filp->f_pos++; 182 183 /* make sure a dentry wasn't dropped while we didn't have parent lock */ 184 if (!ceph_i_test(dir, CEPH_I_COMPLETE)) { 185 dout(" lost I_COMPLETE on %p; falling back to mds\n", dir); 186 err = -EAGAIN; 187 goto out; 188 } 189 190 spin_lock(&parent->d_lock); 191 p = p->prev; /* advance to next dentry */ 192 goto more; 193 194 out_unlock: 195 spin_unlock(&parent->d_lock); 196 out: 197 if (last) 198 dput(last); 199 return err; 200 } 201 202 /* 203 * make note of the last dentry we read, so we can 204 * continue at the same lexicographical point, 205 * regardless of what dir changes take place on the 206 * server. 207 */ 208 static int note_last_dentry(struct ceph_file_info *fi, const char *name, 209 int len) 210 { 211 kfree(fi->last_name); 212 fi->last_name = kmalloc(len+1, GFP_NOFS); 213 if (!fi->last_name) 214 return -ENOMEM; 215 memcpy(fi->last_name, name, len); 216 fi->last_name[len] = 0; 217 dout("note_last_dentry '%s'\n", fi->last_name); 218 return 0; 219 } 220 221 static int ceph_readdir(struct file *filp, void *dirent, filldir_t filldir) 222 { 223 struct ceph_file_info *fi = filp->private_data; 224 struct inode *inode = filp->f_dentry->d_inode; 225 struct ceph_inode_info *ci = ceph_inode(inode); 226 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 227 struct ceph_mds_client *mdsc = fsc->mdsc; 228 unsigned frag = fpos_frag(filp->f_pos); 229 int off = fpos_off(filp->f_pos); 230 int err; 231 u32 ftype; 232 struct ceph_mds_reply_info_parsed *rinfo; 233 const int max_entries = fsc->mount_options->max_readdir; 234 const int max_bytes = fsc->mount_options->max_readdir_bytes; 235 236 dout("readdir %p filp %p frag %u off %u\n", inode, filp, frag, off); 237 if (fi->at_end) 238 return 0; 239 240 /* always start with . and .. */ 241 if (filp->f_pos == 0) { 242 /* note dir version at start of readdir so we can tell 243 * if any dentries get dropped */ 244 fi->dir_release_count = ci->i_release_count; 245 246 dout("readdir off 0 -> '.'\n"); 247 if (filldir(dirent, ".", 1, ceph_make_fpos(0, 0), 248 ceph_translate_ino(inode->i_sb, inode->i_ino), 249 inode->i_mode >> 12) < 0) 250 return 0; 251 filp->f_pos = 1; 252 off = 1; 253 } 254 if (filp->f_pos == 1) { 255 ino_t ino = filp->f_dentry->d_parent->d_inode->i_ino; 256 dout("readdir off 1 -> '..'\n"); 257 if (filldir(dirent, "..", 2, ceph_make_fpos(0, 1), 258 ceph_translate_ino(inode->i_sb, ino), 259 inode->i_mode >> 12) < 0) 260 return 0; 261 filp->f_pos = 2; 262 off = 2; 263 } 264 265 /* can we use the dcache? */ 266 spin_lock(&inode->i_lock); 267 if ((filp->f_pos == 2 || fi->dentry) && 268 !ceph_test_mount_opt(fsc, NOASYNCREADDIR) && 269 ceph_snap(inode) != CEPH_SNAPDIR && 270 (ci->i_ceph_flags & CEPH_I_COMPLETE) && 271 __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1)) { 272 spin_unlock(&inode->i_lock); 273 err = __dcache_readdir(filp, dirent, filldir); 274 if (err != -EAGAIN) 275 return err; 276 } else { 277 spin_unlock(&inode->i_lock); 278 } 279 if (fi->dentry) { 280 err = note_last_dentry(fi, fi->dentry->d_name.name, 281 fi->dentry->d_name.len); 282 if (err) 283 return err; 284 dput(fi->dentry); 285 fi->dentry = NULL; 286 } 287 288 /* proceed with a normal readdir */ 289 290 more: 291 /* do we have the correct frag content buffered? */ 292 if (fi->frag != frag || fi->last_readdir == NULL) { 293 struct ceph_mds_request *req; 294 int op = ceph_snap(inode) == CEPH_SNAPDIR ? 295 CEPH_MDS_OP_LSSNAP : CEPH_MDS_OP_READDIR; 296 297 /* discard old result, if any */ 298 if (fi->last_readdir) { 299 ceph_mdsc_put_request(fi->last_readdir); 300 fi->last_readdir = NULL; 301 } 302 303 /* requery frag tree, as the frag topology may have changed */ 304 frag = ceph_choose_frag(ceph_inode(inode), frag, NULL, NULL); 305 306 dout("readdir fetching %llx.%llx frag %x offset '%s'\n", 307 ceph_vinop(inode), frag, fi->last_name); 308 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); 309 if (IS_ERR(req)) 310 return PTR_ERR(req); 311 req->r_inode = igrab(inode); 312 req->r_dentry = dget(filp->f_dentry); 313 /* hints to request -> mds selection code */ 314 req->r_direct_mode = USE_AUTH_MDS; 315 req->r_direct_hash = ceph_frag_value(frag); 316 req->r_direct_is_hash = true; 317 req->r_path2 = kstrdup(fi->last_name, GFP_NOFS); 318 req->r_readdir_offset = fi->next_offset; 319 req->r_args.readdir.frag = cpu_to_le32(frag); 320 req->r_args.readdir.max_entries = cpu_to_le32(max_entries); 321 req->r_args.readdir.max_bytes = cpu_to_le32(max_bytes); 322 req->r_num_caps = max_entries + 1; 323 err = ceph_mdsc_do_request(mdsc, NULL, req); 324 if (err < 0) { 325 ceph_mdsc_put_request(req); 326 return err; 327 } 328 dout("readdir got and parsed readdir result=%d" 329 " on frag %x, end=%d, complete=%d\n", err, frag, 330 (int)req->r_reply_info.dir_end, 331 (int)req->r_reply_info.dir_complete); 332 333 if (!req->r_did_prepopulate) { 334 dout("readdir !did_prepopulate"); 335 fi->dir_release_count--; /* preclude I_COMPLETE */ 336 } 337 338 /* note next offset and last dentry name */ 339 fi->offset = fi->next_offset; 340 fi->last_readdir = req; 341 342 if (req->r_reply_info.dir_end) { 343 kfree(fi->last_name); 344 fi->last_name = NULL; 345 if (ceph_frag_is_rightmost(frag)) 346 fi->next_offset = 2; 347 else 348 fi->next_offset = 0; 349 } else { 350 rinfo = &req->r_reply_info; 351 err = note_last_dentry(fi, 352 rinfo->dir_dname[rinfo->dir_nr-1], 353 rinfo->dir_dname_len[rinfo->dir_nr-1]); 354 if (err) 355 return err; 356 fi->next_offset += rinfo->dir_nr; 357 } 358 } 359 360 rinfo = &fi->last_readdir->r_reply_info; 361 dout("readdir frag %x num %d off %d chunkoff %d\n", frag, 362 rinfo->dir_nr, off, fi->offset); 363 while (off - fi->offset >= 0 && off - fi->offset < rinfo->dir_nr) { 364 u64 pos = ceph_make_fpos(frag, off); 365 struct ceph_mds_reply_inode *in = 366 rinfo->dir_in[off - fi->offset].in; 367 struct ceph_vino vino; 368 ino_t ino; 369 370 dout("readdir off %d (%d/%d) -> %lld '%.*s' %p\n", 371 off, off - fi->offset, rinfo->dir_nr, pos, 372 rinfo->dir_dname_len[off - fi->offset], 373 rinfo->dir_dname[off - fi->offset], in); 374 BUG_ON(!in); 375 ftype = le32_to_cpu(in->mode) >> 12; 376 vino.ino = le64_to_cpu(in->ino); 377 vino.snap = le64_to_cpu(in->snapid); 378 ino = ceph_vino_to_ino(vino); 379 if (filldir(dirent, 380 rinfo->dir_dname[off - fi->offset], 381 rinfo->dir_dname_len[off - fi->offset], 382 pos, 383 ceph_translate_ino(inode->i_sb, ino), ftype) < 0) { 384 dout("filldir stopping us...\n"); 385 return 0; 386 } 387 off++; 388 filp->f_pos = pos + 1; 389 } 390 391 if (fi->last_name) { 392 ceph_mdsc_put_request(fi->last_readdir); 393 fi->last_readdir = NULL; 394 goto more; 395 } 396 397 /* more frags? */ 398 if (!ceph_frag_is_rightmost(frag)) { 399 frag = ceph_frag_next(frag); 400 off = 0; 401 filp->f_pos = ceph_make_fpos(frag, off); 402 dout("readdir next frag is %x\n", frag); 403 goto more; 404 } 405 fi->at_end = 1; 406 407 /* 408 * if dir_release_count still matches the dir, no dentries 409 * were released during the whole readdir, and we should have 410 * the complete dir contents in our cache. 411 */ 412 spin_lock(&inode->i_lock); 413 if (ci->i_release_count == fi->dir_release_count) { 414 dout(" marking %p complete\n", inode); 415 /* ci->i_ceph_flags |= CEPH_I_COMPLETE; */ 416 ci->i_max_offset = filp->f_pos; 417 } 418 spin_unlock(&inode->i_lock); 419 420 dout("readdir %p filp %p done.\n", inode, filp); 421 return 0; 422 } 423 424 static void reset_readdir(struct ceph_file_info *fi) 425 { 426 if (fi->last_readdir) { 427 ceph_mdsc_put_request(fi->last_readdir); 428 fi->last_readdir = NULL; 429 } 430 kfree(fi->last_name); 431 fi->last_name = NULL; 432 fi->next_offset = 2; /* compensate for . and .. */ 433 if (fi->dentry) { 434 dput(fi->dentry); 435 fi->dentry = NULL; 436 } 437 fi->at_end = 0; 438 } 439 440 static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int origin) 441 { 442 struct ceph_file_info *fi = file->private_data; 443 struct inode *inode = file->f_mapping->host; 444 loff_t old_offset = offset; 445 loff_t retval; 446 447 mutex_lock(&inode->i_mutex); 448 switch (origin) { 449 case SEEK_END: 450 offset += inode->i_size + 2; /* FIXME */ 451 break; 452 case SEEK_CUR: 453 offset += file->f_pos; 454 } 455 retval = -EINVAL; 456 if (offset >= 0 && offset <= inode->i_sb->s_maxbytes) { 457 if (offset != file->f_pos) { 458 file->f_pos = offset; 459 file->f_version = 0; 460 fi->at_end = 0; 461 } 462 retval = offset; 463 464 /* 465 * discard buffered readdir content on seekdir(0), or 466 * seek to new frag, or seek prior to current chunk. 467 */ 468 if (offset == 0 || 469 fpos_frag(offset) != fpos_frag(old_offset) || 470 fpos_off(offset) < fi->offset) { 471 dout("dir_llseek dropping %p content\n", file); 472 reset_readdir(fi); 473 } 474 475 /* bump dir_release_count if we did a forward seek */ 476 if (offset > old_offset) 477 fi->dir_release_count--; 478 } 479 mutex_unlock(&inode->i_mutex); 480 return retval; 481 } 482 483 /* 484 * Process result of a lookup/open request. 485 * 486 * Mainly, make sure we return the final req->r_dentry (if it already 487 * existed) in place of the original VFS-provided dentry when they 488 * differ. 489 * 490 * Gracefully handle the case where the MDS replies with -ENOENT and 491 * no trace (which it may do, at its discretion, e.g., if it doesn't 492 * care to issue a lease on the negative dentry). 493 */ 494 struct dentry *ceph_finish_lookup(struct ceph_mds_request *req, 495 struct dentry *dentry, int err) 496 { 497 struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb); 498 struct inode *parent = dentry->d_parent->d_inode; 499 500 /* .snap dir? */ 501 if (err == -ENOENT && 502 ceph_snap(parent) == CEPH_NOSNAP && 503 strcmp(dentry->d_name.name, 504 fsc->mount_options->snapdir_name) == 0) { 505 struct inode *inode = ceph_get_snapdir(parent); 506 dout("ENOENT on snapdir %p '%.*s', linking to snapdir %p\n", 507 dentry, dentry->d_name.len, dentry->d_name.name, inode); 508 BUG_ON(!d_unhashed(dentry)); 509 d_add(dentry, inode); 510 err = 0; 511 } 512 513 if (err == -ENOENT) { 514 /* no trace? */ 515 err = 0; 516 if (!req->r_reply_info.head->is_dentry) { 517 dout("ENOENT and no trace, dentry %p inode %p\n", 518 dentry, dentry->d_inode); 519 if (dentry->d_inode) { 520 d_drop(dentry); 521 err = -ENOENT; 522 } else { 523 d_add(dentry, NULL); 524 } 525 } 526 } 527 if (err) 528 dentry = ERR_PTR(err); 529 else if (dentry != req->r_dentry) 530 dentry = dget(req->r_dentry); /* we got spliced */ 531 else 532 dentry = NULL; 533 return dentry; 534 } 535 536 static int is_root_ceph_dentry(struct inode *inode, struct dentry *dentry) 537 { 538 return ceph_ino(inode) == CEPH_INO_ROOT && 539 strncmp(dentry->d_name.name, ".ceph", 5) == 0; 540 } 541 542 /* 543 * Look up a single dir entry. If there is a lookup intent, inform 544 * the MDS so that it gets our 'caps wanted' value in a single op. 545 */ 546 static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry, 547 struct nameidata *nd) 548 { 549 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); 550 struct ceph_mds_client *mdsc = fsc->mdsc; 551 struct ceph_mds_request *req; 552 int op; 553 int err; 554 555 dout("lookup %p dentry %p '%.*s'\n", 556 dir, dentry, dentry->d_name.len, dentry->d_name.name); 557 558 if (dentry->d_name.len > NAME_MAX) 559 return ERR_PTR(-ENAMETOOLONG); 560 561 err = ceph_init_dentry(dentry); 562 if (err < 0) 563 return ERR_PTR(err); 564 565 /* open (but not create!) intent? */ 566 if (nd && 567 (nd->flags & LOOKUP_OPEN) && 568 (nd->flags & LOOKUP_CONTINUE) == 0 && /* only open last component */ 569 !(nd->intent.open.flags & O_CREAT)) { 570 int mode = nd->intent.open.create_mode & ~current->fs->umask; 571 return ceph_lookup_open(dir, dentry, nd, mode, 1); 572 } 573 574 /* can we conclude ENOENT locally? */ 575 if (dentry->d_inode == NULL) { 576 struct ceph_inode_info *ci = ceph_inode(dir); 577 struct ceph_dentry_info *di = ceph_dentry(dentry); 578 579 spin_lock(&dir->i_lock); 580 dout(" dir %p flags are %d\n", dir, ci->i_ceph_flags); 581 if (strncmp(dentry->d_name.name, 582 fsc->mount_options->snapdir_name, 583 dentry->d_name.len) && 584 !is_root_ceph_dentry(dir, dentry) && 585 (ci->i_ceph_flags & CEPH_I_COMPLETE) && 586 (__ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1))) { 587 spin_unlock(&dir->i_lock); 588 dout(" dir %p complete, -ENOENT\n", dir); 589 d_add(dentry, NULL); 590 di->lease_shared_gen = ci->i_shared_gen; 591 return NULL; 592 } 593 spin_unlock(&dir->i_lock); 594 } 595 596 op = ceph_snap(dir) == CEPH_SNAPDIR ? 597 CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP; 598 req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS); 599 if (IS_ERR(req)) 600 return ERR_CAST(req); 601 req->r_dentry = dget(dentry); 602 req->r_num_caps = 2; 603 /* we only need inode linkage */ 604 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE); 605 req->r_locked_dir = dir; 606 err = ceph_mdsc_do_request(mdsc, NULL, req); 607 dentry = ceph_finish_lookup(req, dentry, err); 608 ceph_mdsc_put_request(req); /* will dput(dentry) */ 609 dout("lookup result=%p\n", dentry); 610 return dentry; 611 } 612 613 /* 614 * If we do a create but get no trace back from the MDS, follow up with 615 * a lookup (the VFS expects us to link up the provided dentry). 616 */ 617 int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry) 618 { 619 struct dentry *result = ceph_lookup(dir, dentry, NULL); 620 621 if (result && !IS_ERR(result)) { 622 /* 623 * We created the item, then did a lookup, and found 624 * it was already linked to another inode we already 625 * had in our cache (and thus got spliced). Link our 626 * dentry to that inode, but don't hash it, just in 627 * case the VFS wants to dereference it. 628 */ 629 BUG_ON(!result->d_inode); 630 d_instantiate(dentry, result->d_inode); 631 return 0; 632 } 633 return PTR_ERR(result); 634 } 635 636 static int ceph_mknod(struct inode *dir, struct dentry *dentry, 637 int mode, dev_t rdev) 638 { 639 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); 640 struct ceph_mds_client *mdsc = fsc->mdsc; 641 struct ceph_mds_request *req; 642 int err; 643 644 if (ceph_snap(dir) != CEPH_NOSNAP) 645 return -EROFS; 646 647 dout("mknod in dir %p dentry %p mode 0%o rdev %d\n", 648 dir, dentry, mode, rdev); 649 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_MKNOD, USE_AUTH_MDS); 650 if (IS_ERR(req)) { 651 d_drop(dentry); 652 return PTR_ERR(req); 653 } 654 req->r_dentry = dget(dentry); 655 req->r_num_caps = 2; 656 req->r_locked_dir = dir; 657 req->r_args.mknod.mode = cpu_to_le32(mode); 658 req->r_args.mknod.rdev = cpu_to_le32(rdev); 659 req->r_dentry_drop = CEPH_CAP_FILE_SHARED; 660 req->r_dentry_unless = CEPH_CAP_FILE_EXCL; 661 err = ceph_mdsc_do_request(mdsc, dir, req); 662 if (!err && !req->r_reply_info.head->is_dentry) 663 err = ceph_handle_notrace_create(dir, dentry); 664 ceph_mdsc_put_request(req); 665 if (err) 666 d_drop(dentry); 667 return err; 668 } 669 670 static int ceph_create(struct inode *dir, struct dentry *dentry, int mode, 671 struct nameidata *nd) 672 { 673 dout("create in dir %p dentry %p name '%.*s'\n", 674 dir, dentry, dentry->d_name.len, dentry->d_name.name); 675 676 if (ceph_snap(dir) != CEPH_NOSNAP) 677 return -EROFS; 678 679 if (nd) { 680 BUG_ON((nd->flags & LOOKUP_OPEN) == 0); 681 dentry = ceph_lookup_open(dir, dentry, nd, mode, 0); 682 /* hrm, what should i do here if we get aliased? */ 683 if (IS_ERR(dentry)) 684 return PTR_ERR(dentry); 685 return 0; 686 } 687 688 /* fall back to mknod */ 689 return ceph_mknod(dir, dentry, (mode & ~S_IFMT) | S_IFREG, 0); 690 } 691 692 static int ceph_symlink(struct inode *dir, struct dentry *dentry, 693 const char *dest) 694 { 695 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); 696 struct ceph_mds_client *mdsc = fsc->mdsc; 697 struct ceph_mds_request *req; 698 int err; 699 700 if (ceph_snap(dir) != CEPH_NOSNAP) 701 return -EROFS; 702 703 dout("symlink in dir %p dentry %p to '%s'\n", dir, dentry, dest); 704 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SYMLINK, USE_AUTH_MDS); 705 if (IS_ERR(req)) { 706 d_drop(dentry); 707 return PTR_ERR(req); 708 } 709 req->r_dentry = dget(dentry); 710 req->r_num_caps = 2; 711 req->r_path2 = kstrdup(dest, GFP_NOFS); 712 req->r_locked_dir = dir; 713 req->r_dentry_drop = CEPH_CAP_FILE_SHARED; 714 req->r_dentry_unless = CEPH_CAP_FILE_EXCL; 715 err = ceph_mdsc_do_request(mdsc, dir, req); 716 if (!err && !req->r_reply_info.head->is_dentry) 717 err = ceph_handle_notrace_create(dir, dentry); 718 ceph_mdsc_put_request(req); 719 if (err) 720 d_drop(dentry); 721 return err; 722 } 723 724 static int ceph_mkdir(struct inode *dir, struct dentry *dentry, int mode) 725 { 726 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); 727 struct ceph_mds_client *mdsc = fsc->mdsc; 728 struct ceph_mds_request *req; 729 int err = -EROFS; 730 int op; 731 732 if (ceph_snap(dir) == CEPH_SNAPDIR) { 733 /* mkdir .snap/foo is a MKSNAP */ 734 op = CEPH_MDS_OP_MKSNAP; 735 dout("mksnap dir %p snap '%.*s' dn %p\n", dir, 736 dentry->d_name.len, dentry->d_name.name, dentry); 737 } else if (ceph_snap(dir) == CEPH_NOSNAP) { 738 dout("mkdir dir %p dn %p mode 0%o\n", dir, dentry, mode); 739 op = CEPH_MDS_OP_MKDIR; 740 } else { 741 goto out; 742 } 743 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); 744 if (IS_ERR(req)) { 745 err = PTR_ERR(req); 746 goto out; 747 } 748 749 req->r_dentry = dget(dentry); 750 req->r_num_caps = 2; 751 req->r_locked_dir = dir; 752 req->r_args.mkdir.mode = cpu_to_le32(mode); 753 req->r_dentry_drop = CEPH_CAP_FILE_SHARED; 754 req->r_dentry_unless = CEPH_CAP_FILE_EXCL; 755 err = ceph_mdsc_do_request(mdsc, dir, req); 756 if (!err && !req->r_reply_info.head->is_dentry) 757 err = ceph_handle_notrace_create(dir, dentry); 758 ceph_mdsc_put_request(req); 759 out: 760 if (err < 0) 761 d_drop(dentry); 762 return err; 763 } 764 765 static int ceph_link(struct dentry *old_dentry, struct inode *dir, 766 struct dentry *dentry) 767 { 768 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); 769 struct ceph_mds_client *mdsc = fsc->mdsc; 770 struct ceph_mds_request *req; 771 int err; 772 773 if (ceph_snap(dir) != CEPH_NOSNAP) 774 return -EROFS; 775 776 dout("link in dir %p old_dentry %p dentry %p\n", dir, 777 old_dentry, dentry); 778 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LINK, USE_AUTH_MDS); 779 if (IS_ERR(req)) { 780 d_drop(dentry); 781 return PTR_ERR(req); 782 } 783 req->r_dentry = dget(dentry); 784 req->r_num_caps = 2; 785 req->r_old_dentry = dget(old_dentry); /* or inode? hrm. */ 786 req->r_locked_dir = dir; 787 req->r_dentry_drop = CEPH_CAP_FILE_SHARED; 788 req->r_dentry_unless = CEPH_CAP_FILE_EXCL; 789 err = ceph_mdsc_do_request(mdsc, dir, req); 790 if (err) 791 d_drop(dentry); 792 else if (!req->r_reply_info.head->is_dentry) 793 d_instantiate(dentry, igrab(old_dentry->d_inode)); 794 ceph_mdsc_put_request(req); 795 return err; 796 } 797 798 /* 799 * For a soon-to-be unlinked file, drop the AUTH_RDCACHE caps. If it 800 * looks like the link count will hit 0, drop any other caps (other 801 * than PIN) we don't specifically want (due to the file still being 802 * open). 803 */ 804 static int drop_caps_for_unlink(struct inode *inode) 805 { 806 struct ceph_inode_info *ci = ceph_inode(inode); 807 int drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL; 808 809 spin_lock(&inode->i_lock); 810 if (inode->i_nlink == 1) { 811 drop |= ~(__ceph_caps_wanted(ci) | CEPH_CAP_PIN); 812 ci->i_ceph_flags |= CEPH_I_NODELAY; 813 } 814 spin_unlock(&inode->i_lock); 815 return drop; 816 } 817 818 /* 819 * rmdir and unlink are differ only by the metadata op code 820 */ 821 static int ceph_unlink(struct inode *dir, struct dentry *dentry) 822 { 823 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); 824 struct ceph_mds_client *mdsc = fsc->mdsc; 825 struct inode *inode = dentry->d_inode; 826 struct ceph_mds_request *req; 827 int err = -EROFS; 828 int op; 829 830 if (ceph_snap(dir) == CEPH_SNAPDIR) { 831 /* rmdir .snap/foo is RMSNAP */ 832 dout("rmsnap dir %p '%.*s' dn %p\n", dir, dentry->d_name.len, 833 dentry->d_name.name, dentry); 834 op = CEPH_MDS_OP_RMSNAP; 835 } else if (ceph_snap(dir) == CEPH_NOSNAP) { 836 dout("unlink/rmdir dir %p dn %p inode %p\n", 837 dir, dentry, inode); 838 op = ((dentry->d_inode->i_mode & S_IFMT) == S_IFDIR) ? 839 CEPH_MDS_OP_RMDIR : CEPH_MDS_OP_UNLINK; 840 } else 841 goto out; 842 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); 843 if (IS_ERR(req)) { 844 err = PTR_ERR(req); 845 goto out; 846 } 847 req->r_dentry = dget(dentry); 848 req->r_num_caps = 2; 849 req->r_locked_dir = dir; 850 req->r_dentry_drop = CEPH_CAP_FILE_SHARED; 851 req->r_dentry_unless = CEPH_CAP_FILE_EXCL; 852 req->r_inode_drop = drop_caps_for_unlink(inode); 853 err = ceph_mdsc_do_request(mdsc, dir, req); 854 if (!err && !req->r_reply_info.head->is_dentry) 855 d_delete(dentry); 856 ceph_mdsc_put_request(req); 857 out: 858 return err; 859 } 860 861 static int ceph_rename(struct inode *old_dir, struct dentry *old_dentry, 862 struct inode *new_dir, struct dentry *new_dentry) 863 { 864 struct ceph_fs_client *fsc = ceph_sb_to_client(old_dir->i_sb); 865 struct ceph_mds_client *mdsc = fsc->mdsc; 866 struct ceph_mds_request *req; 867 int err; 868 869 if (ceph_snap(old_dir) != ceph_snap(new_dir)) 870 return -EXDEV; 871 if (ceph_snap(old_dir) != CEPH_NOSNAP || 872 ceph_snap(new_dir) != CEPH_NOSNAP) 873 return -EROFS; 874 dout("rename dir %p dentry %p to dir %p dentry %p\n", 875 old_dir, old_dentry, new_dir, new_dentry); 876 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_RENAME, USE_AUTH_MDS); 877 if (IS_ERR(req)) 878 return PTR_ERR(req); 879 req->r_dentry = dget(new_dentry); 880 req->r_num_caps = 2; 881 req->r_old_dentry = dget(old_dentry); 882 req->r_locked_dir = new_dir; 883 req->r_old_dentry_drop = CEPH_CAP_FILE_SHARED; 884 req->r_old_dentry_unless = CEPH_CAP_FILE_EXCL; 885 req->r_dentry_drop = CEPH_CAP_FILE_SHARED; 886 req->r_dentry_unless = CEPH_CAP_FILE_EXCL; 887 /* release LINK_RDCACHE on source inode (mds will lock it) */ 888 req->r_old_inode_drop = CEPH_CAP_LINK_SHARED; 889 if (new_dentry->d_inode) 890 req->r_inode_drop = drop_caps_for_unlink(new_dentry->d_inode); 891 err = ceph_mdsc_do_request(mdsc, old_dir, req); 892 if (!err && !req->r_reply_info.head->is_dentry) { 893 /* 894 * Normally d_move() is done by fill_trace (called by 895 * do_request, above). If there is no trace, we need 896 * to do it here. 897 */ 898 899 /* d_move screws up d_subdirs order */ 900 ceph_i_clear(new_dir, CEPH_I_COMPLETE); 901 902 d_move(old_dentry, new_dentry); 903 904 /* ensure target dentry is invalidated, despite 905 rehashing bug in vfs_rename_dir */ 906 ceph_invalidate_dentry_lease(new_dentry); 907 } 908 ceph_mdsc_put_request(req); 909 return err; 910 } 911 912 /* 913 * Ensure a dentry lease will no longer revalidate. 914 */ 915 void ceph_invalidate_dentry_lease(struct dentry *dentry) 916 { 917 spin_lock(&dentry->d_lock); 918 dentry->d_time = jiffies; 919 ceph_dentry(dentry)->lease_shared_gen = 0; 920 spin_unlock(&dentry->d_lock); 921 } 922 923 /* 924 * Check if dentry lease is valid. If not, delete the lease. Try to 925 * renew if the least is more than half up. 926 */ 927 static int dentry_lease_is_valid(struct dentry *dentry) 928 { 929 struct ceph_dentry_info *di; 930 struct ceph_mds_session *s; 931 int valid = 0; 932 u32 gen; 933 unsigned long ttl; 934 struct ceph_mds_session *session = NULL; 935 struct inode *dir = NULL; 936 u32 seq = 0; 937 938 spin_lock(&dentry->d_lock); 939 di = ceph_dentry(dentry); 940 if (di && di->lease_session) { 941 s = di->lease_session; 942 spin_lock(&s->s_cap_lock); 943 gen = s->s_cap_gen; 944 ttl = s->s_cap_ttl; 945 spin_unlock(&s->s_cap_lock); 946 947 if (di->lease_gen == gen && 948 time_before(jiffies, dentry->d_time) && 949 time_before(jiffies, ttl)) { 950 valid = 1; 951 if (di->lease_renew_after && 952 time_after(jiffies, di->lease_renew_after)) { 953 /* we should renew */ 954 dir = dentry->d_parent->d_inode; 955 session = ceph_get_mds_session(s); 956 seq = di->lease_seq; 957 di->lease_renew_after = 0; 958 di->lease_renew_from = jiffies; 959 } 960 } 961 } 962 spin_unlock(&dentry->d_lock); 963 964 if (session) { 965 ceph_mdsc_lease_send_msg(session, dir, dentry, 966 CEPH_MDS_LEASE_RENEW, seq); 967 ceph_put_mds_session(session); 968 } 969 dout("dentry_lease_is_valid - dentry %p = %d\n", dentry, valid); 970 return valid; 971 } 972 973 /* 974 * Check if directory-wide content lease/cap is valid. 975 */ 976 static int dir_lease_is_valid(struct inode *dir, struct dentry *dentry) 977 { 978 struct ceph_inode_info *ci = ceph_inode(dir); 979 struct ceph_dentry_info *di = ceph_dentry(dentry); 980 int valid = 0; 981 982 spin_lock(&dir->i_lock); 983 if (ci->i_shared_gen == di->lease_shared_gen) 984 valid = __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1); 985 spin_unlock(&dir->i_lock); 986 dout("dir_lease_is_valid dir %p v%u dentry %p v%u = %d\n", 987 dir, (unsigned)ci->i_shared_gen, dentry, 988 (unsigned)di->lease_shared_gen, valid); 989 return valid; 990 } 991 992 /* 993 * Check if cached dentry can be trusted. 994 */ 995 static int ceph_d_revalidate(struct dentry *dentry, struct nameidata *nd) 996 { 997 struct inode *dir; 998 999 if (nd && nd->flags & LOOKUP_RCU) 1000 return -ECHILD; 1001 1002 dir = dentry->d_parent->d_inode; 1003 1004 dout("d_revalidate %p '%.*s' inode %p offset %lld\n", dentry, 1005 dentry->d_name.len, dentry->d_name.name, dentry->d_inode, 1006 ceph_dentry(dentry)->offset); 1007 1008 /* always trust cached snapped dentries, snapdir dentry */ 1009 if (ceph_snap(dir) != CEPH_NOSNAP) { 1010 dout("d_revalidate %p '%.*s' inode %p is SNAPPED\n", dentry, 1011 dentry->d_name.len, dentry->d_name.name, dentry->d_inode); 1012 goto out_touch; 1013 } 1014 if (dentry->d_inode && ceph_snap(dentry->d_inode) == CEPH_SNAPDIR) 1015 goto out_touch; 1016 1017 if (dentry_lease_is_valid(dentry) || 1018 dir_lease_is_valid(dir, dentry)) 1019 goto out_touch; 1020 1021 dout("d_revalidate %p invalid\n", dentry); 1022 d_drop(dentry); 1023 return 0; 1024 out_touch: 1025 ceph_dentry_lru_touch(dentry); 1026 return 1; 1027 } 1028 1029 /* 1030 * Release our ceph_dentry_info. 1031 */ 1032 static void ceph_d_release(struct dentry *dentry) 1033 { 1034 struct ceph_dentry_info *di = ceph_dentry(dentry); 1035 1036 dout("d_release %p\n", dentry); 1037 if (di) { 1038 ceph_dentry_lru_del(dentry); 1039 if (di->lease_session) 1040 ceph_put_mds_session(di->lease_session); 1041 kmem_cache_free(ceph_dentry_cachep, di); 1042 dentry->d_fsdata = NULL; 1043 } 1044 } 1045 1046 static int ceph_snapdir_d_revalidate(struct dentry *dentry, 1047 struct nameidata *nd) 1048 { 1049 /* 1050 * Eventually, we'll want to revalidate snapped metadata 1051 * too... probably... 1052 */ 1053 return 1; 1054 } 1055 1056 1057 1058 /* 1059 * read() on a dir. This weird interface hack only works if mounted 1060 * with '-o dirstat'. 1061 */ 1062 static ssize_t ceph_read_dir(struct file *file, char __user *buf, size_t size, 1063 loff_t *ppos) 1064 { 1065 struct ceph_file_info *cf = file->private_data; 1066 struct inode *inode = file->f_dentry->d_inode; 1067 struct ceph_inode_info *ci = ceph_inode(inode); 1068 int left; 1069 1070 if (!ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb), DIRSTAT)) 1071 return -EISDIR; 1072 1073 if (!cf->dir_info) { 1074 cf->dir_info = kmalloc(1024, GFP_NOFS); 1075 if (!cf->dir_info) 1076 return -ENOMEM; 1077 cf->dir_info_len = 1078 sprintf(cf->dir_info, 1079 "entries: %20lld\n" 1080 " files: %20lld\n" 1081 " subdirs: %20lld\n" 1082 "rentries: %20lld\n" 1083 " rfiles: %20lld\n" 1084 " rsubdirs: %20lld\n" 1085 "rbytes: %20lld\n" 1086 "rctime: %10ld.%09ld\n", 1087 ci->i_files + ci->i_subdirs, 1088 ci->i_files, 1089 ci->i_subdirs, 1090 ci->i_rfiles + ci->i_rsubdirs, 1091 ci->i_rfiles, 1092 ci->i_rsubdirs, 1093 ci->i_rbytes, 1094 (long)ci->i_rctime.tv_sec, 1095 (long)ci->i_rctime.tv_nsec); 1096 } 1097 1098 if (*ppos >= cf->dir_info_len) 1099 return 0; 1100 size = min_t(unsigned, size, cf->dir_info_len-*ppos); 1101 left = copy_to_user(buf, cf->dir_info + *ppos, size); 1102 if (left == size) 1103 return -EFAULT; 1104 *ppos += (size - left); 1105 return size - left; 1106 } 1107 1108 /* 1109 * an fsync() on a dir will wait for any uncommitted directory 1110 * operations to commit. 1111 */ 1112 static int ceph_dir_fsync(struct file *file, int datasync) 1113 { 1114 struct inode *inode = file->f_path.dentry->d_inode; 1115 struct ceph_inode_info *ci = ceph_inode(inode); 1116 struct list_head *head = &ci->i_unsafe_dirops; 1117 struct ceph_mds_request *req; 1118 u64 last_tid; 1119 int ret = 0; 1120 1121 dout("dir_fsync %p\n", inode); 1122 spin_lock(&ci->i_unsafe_lock); 1123 if (list_empty(head)) 1124 goto out; 1125 1126 req = list_entry(head->prev, 1127 struct ceph_mds_request, r_unsafe_dir_item); 1128 last_tid = req->r_tid; 1129 1130 do { 1131 ceph_mdsc_get_request(req); 1132 spin_unlock(&ci->i_unsafe_lock); 1133 dout("dir_fsync %p wait on tid %llu (until %llu)\n", 1134 inode, req->r_tid, last_tid); 1135 if (req->r_timeout) { 1136 ret = wait_for_completion_timeout( 1137 &req->r_safe_completion, req->r_timeout); 1138 if (ret > 0) 1139 ret = 0; 1140 else if (ret == 0) 1141 ret = -EIO; /* timed out */ 1142 } else { 1143 wait_for_completion(&req->r_safe_completion); 1144 } 1145 spin_lock(&ci->i_unsafe_lock); 1146 ceph_mdsc_put_request(req); 1147 1148 if (ret || list_empty(head)) 1149 break; 1150 req = list_entry(head->next, 1151 struct ceph_mds_request, r_unsafe_dir_item); 1152 } while (req->r_tid < last_tid); 1153 out: 1154 spin_unlock(&ci->i_unsafe_lock); 1155 return ret; 1156 } 1157 1158 /* 1159 * We maintain a private dentry LRU. 1160 * 1161 * FIXME: this needs to be changed to a per-mds lru to be useful. 1162 */ 1163 void ceph_dentry_lru_add(struct dentry *dn) 1164 { 1165 struct ceph_dentry_info *di = ceph_dentry(dn); 1166 struct ceph_mds_client *mdsc; 1167 1168 dout("dentry_lru_add %p %p '%.*s'\n", di, dn, 1169 dn->d_name.len, dn->d_name.name); 1170 if (di) { 1171 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc; 1172 spin_lock(&mdsc->dentry_lru_lock); 1173 list_add_tail(&di->lru, &mdsc->dentry_lru); 1174 mdsc->num_dentry++; 1175 spin_unlock(&mdsc->dentry_lru_lock); 1176 } 1177 } 1178 1179 void ceph_dentry_lru_touch(struct dentry *dn) 1180 { 1181 struct ceph_dentry_info *di = ceph_dentry(dn); 1182 struct ceph_mds_client *mdsc; 1183 1184 dout("dentry_lru_touch %p %p '%.*s' (offset %lld)\n", di, dn, 1185 dn->d_name.len, dn->d_name.name, di->offset); 1186 if (di) { 1187 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc; 1188 spin_lock(&mdsc->dentry_lru_lock); 1189 list_move_tail(&di->lru, &mdsc->dentry_lru); 1190 spin_unlock(&mdsc->dentry_lru_lock); 1191 } 1192 } 1193 1194 void ceph_dentry_lru_del(struct dentry *dn) 1195 { 1196 struct ceph_dentry_info *di = ceph_dentry(dn); 1197 struct ceph_mds_client *mdsc; 1198 1199 dout("dentry_lru_del %p %p '%.*s'\n", di, dn, 1200 dn->d_name.len, dn->d_name.name); 1201 if (di) { 1202 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc; 1203 spin_lock(&mdsc->dentry_lru_lock); 1204 list_del_init(&di->lru); 1205 mdsc->num_dentry--; 1206 spin_unlock(&mdsc->dentry_lru_lock); 1207 } 1208 } 1209 1210 /* 1211 * Return name hash for a given dentry. This is dependent on 1212 * the parent directory's hash function. 1213 */ 1214 unsigned ceph_dentry_hash(struct dentry *dn) 1215 { 1216 struct inode *dir = dn->d_parent->d_inode; 1217 struct ceph_inode_info *dci = ceph_inode(dir); 1218 1219 switch (dci->i_dir_layout.dl_dir_hash) { 1220 case 0: /* for backward compat */ 1221 case CEPH_STR_HASH_LINUX: 1222 return dn->d_name.hash; 1223 1224 default: 1225 return ceph_str_hash(dci->i_dir_layout.dl_dir_hash, 1226 dn->d_name.name, dn->d_name.len); 1227 } 1228 } 1229 1230 const struct file_operations ceph_dir_fops = { 1231 .read = ceph_read_dir, 1232 .readdir = ceph_readdir, 1233 .llseek = ceph_dir_llseek, 1234 .open = ceph_open, 1235 .release = ceph_release, 1236 .unlocked_ioctl = ceph_ioctl, 1237 .fsync = ceph_dir_fsync, 1238 }; 1239 1240 const struct inode_operations ceph_dir_iops = { 1241 .lookup = ceph_lookup, 1242 .permission = ceph_permission, 1243 .getattr = ceph_getattr, 1244 .setattr = ceph_setattr, 1245 .setxattr = ceph_setxattr, 1246 .getxattr = ceph_getxattr, 1247 .listxattr = ceph_listxattr, 1248 .removexattr = ceph_removexattr, 1249 .mknod = ceph_mknod, 1250 .symlink = ceph_symlink, 1251 .mkdir = ceph_mkdir, 1252 .link = ceph_link, 1253 .unlink = ceph_unlink, 1254 .rmdir = ceph_unlink, 1255 .rename = ceph_rename, 1256 .create = ceph_create, 1257 }; 1258 1259 const struct dentry_operations ceph_dentry_ops = { 1260 .d_revalidate = ceph_d_revalidate, 1261 .d_release = ceph_d_release, 1262 }; 1263 1264 const struct dentry_operations ceph_snapdir_dentry_ops = { 1265 .d_revalidate = ceph_snapdir_d_revalidate, 1266 .d_release = ceph_d_release, 1267 }; 1268 1269 const struct dentry_operations ceph_snap_dentry_ops = { 1270 .d_release = ceph_d_release, 1271 }; 1272