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