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 di = kmem_cache_alloc(ceph_dentry_cachep, GFP_NOFS | __GFP_ZERO); 44 if (!di) 45 return -ENOMEM; /* oh well */ 46 47 spin_lock(&dentry->d_lock); 48 if (dentry->d_fsdata) { 49 /* lost a race */ 50 kmem_cache_free(ceph_dentry_cachep, di); 51 goto out_unlock; 52 } 53 54 if (dentry->d_parent == NULL || /* nfs fh_to_dentry */ 55 ceph_snap(dentry->d_parent->d_inode) == CEPH_NOSNAP) 56 d_set_d_op(dentry, &ceph_dentry_ops); 57 else if (ceph_snap(dentry->d_parent->d_inode) == CEPH_SNAPDIR) 58 d_set_d_op(dentry, &ceph_snapdir_dentry_ops); 59 else 60 d_set_d_op(dentry, &ceph_snap_dentry_ops); 61 62 di->dentry = dentry; 63 di->lease_session = NULL; 64 dentry->d_time = jiffies; 65 /* avoid reordering d_fsdata setup so that the check above is safe */ 66 smp_mb(); 67 dentry->d_fsdata = di; 68 ceph_dentry_lru_add(dentry); 69 out_unlock: 70 spin_unlock(&dentry->d_lock); 71 return 0; 72 } 73 74 struct inode *ceph_get_dentry_parent_inode(struct dentry *dentry) 75 { 76 struct inode *inode = NULL; 77 78 if (!dentry) 79 return NULL; 80 81 spin_lock(&dentry->d_lock); 82 if (dentry->d_parent) { 83 inode = dentry->d_parent->d_inode; 84 ihold(inode); 85 } 86 spin_unlock(&dentry->d_lock); 87 return inode; 88 } 89 90 91 /* 92 * for readdir, we encode the directory frag and offset within that 93 * frag into f_pos. 94 */ 95 static unsigned fpos_frag(loff_t p) 96 { 97 return p >> 32; 98 } 99 static unsigned fpos_off(loff_t p) 100 { 101 return p & 0xffffffff; 102 } 103 104 /* 105 * When possible, we try to satisfy a readdir by peeking at the 106 * dcache. We make this work by carefully ordering dentries on 107 * d_u.d_child when we initially get results back from the MDS, and 108 * falling back to a "normal" sync readdir if any dentries in the dir 109 * are dropped. 110 * 111 * I_COMPLETE tells indicates we have all dentries in the dir. It is 112 * defined IFF we hold CEPH_CAP_FILE_SHARED (which will be revoked by 113 * the MDS if/when the directory is modified). 114 */ 115 static int __dcache_readdir(struct file *filp, 116 void *dirent, filldir_t filldir) 117 { 118 struct ceph_file_info *fi = filp->private_data; 119 struct dentry *parent = filp->f_dentry; 120 struct inode *dir = parent->d_inode; 121 struct list_head *p; 122 struct dentry *dentry, *last; 123 struct ceph_dentry_info *di; 124 int err = 0; 125 126 /* claim ref on last dentry we returned */ 127 last = fi->dentry; 128 fi->dentry = NULL; 129 130 dout("__dcache_readdir %p at %llu (last %p)\n", dir, filp->f_pos, 131 last); 132 133 spin_lock(&parent->d_lock); 134 135 /* start at beginning? */ 136 if (filp->f_pos == 2 || last == NULL || 137 filp->f_pos < ceph_dentry(last)->offset) { 138 if (list_empty(&parent->d_subdirs)) 139 goto out_unlock; 140 p = parent->d_subdirs.prev; 141 dout(" initial p %p/%p\n", p->prev, p->next); 142 } else { 143 p = last->d_u.d_child.prev; 144 } 145 146 more: 147 dentry = list_entry(p, struct dentry, d_u.d_child); 148 di = ceph_dentry(dentry); 149 while (1) { 150 dout(" p %p/%p %s d_subdirs %p/%p\n", p->prev, p->next, 151 d_unhashed(dentry) ? "!hashed" : "hashed", 152 parent->d_subdirs.prev, parent->d_subdirs.next); 153 if (p == &parent->d_subdirs) { 154 fi->flags |= CEPH_F_ATEND; 155 goto out_unlock; 156 } 157 spin_lock_nested(&dentry->d_lock, DENTRY_D_LOCK_NESTED); 158 if (!d_unhashed(dentry) && dentry->d_inode && 159 ceph_snap(dentry->d_inode) != CEPH_SNAPDIR && 160 ceph_ino(dentry->d_inode) != CEPH_INO_CEPH && 161 filp->f_pos <= di->offset) 162 break; 163 dout(" skipping %p %.*s at %llu (%llu)%s%s\n", dentry, 164 dentry->d_name.len, dentry->d_name.name, di->offset, 165 filp->f_pos, d_unhashed(dentry) ? " unhashed" : "", 166 !dentry->d_inode ? " null" : ""); 167 spin_unlock(&dentry->d_lock); 168 p = p->prev; 169 dentry = list_entry(p, struct dentry, d_u.d_child); 170 di = ceph_dentry(dentry); 171 } 172 173 dget_dlock(dentry); 174 spin_unlock(&dentry->d_lock); 175 spin_unlock(&parent->d_lock); 176 177 dout(" %llu (%llu) dentry %p %.*s %p\n", di->offset, filp->f_pos, 178 dentry, dentry->d_name.len, dentry->d_name.name, dentry->d_inode); 179 filp->f_pos = di->offset; 180 err = filldir(dirent, dentry->d_name.name, 181 dentry->d_name.len, di->offset, 182 ceph_translate_ino(dentry->d_sb, dentry->d_inode->i_ino), 183 dentry->d_inode->i_mode >> 12); 184 185 if (last) { 186 if (err < 0) { 187 /* remember our position */ 188 fi->dentry = last; 189 fi->next_offset = di->offset; 190 } else { 191 dput(last); 192 } 193 } 194 last = dentry; 195 196 if (err < 0) 197 goto out; 198 199 filp->f_pos++; 200 201 /* make sure a dentry wasn't dropped while we didn't have parent lock */ 202 if (!ceph_i_test(dir, CEPH_I_COMPLETE)) { 203 dout(" lost I_COMPLETE on %p; falling back to mds\n", dir); 204 err = -EAGAIN; 205 goto out; 206 } 207 208 spin_lock(&parent->d_lock); 209 p = p->prev; /* advance to next dentry */ 210 goto more; 211 212 out_unlock: 213 spin_unlock(&parent->d_lock); 214 out: 215 if (last) 216 dput(last); 217 return err; 218 } 219 220 /* 221 * make note of the last dentry we read, so we can 222 * continue at the same lexicographical point, 223 * regardless of what dir changes take place on the 224 * server. 225 */ 226 static int note_last_dentry(struct ceph_file_info *fi, const char *name, 227 int len) 228 { 229 kfree(fi->last_name); 230 fi->last_name = kmalloc(len+1, GFP_NOFS); 231 if (!fi->last_name) 232 return -ENOMEM; 233 memcpy(fi->last_name, name, len); 234 fi->last_name[len] = 0; 235 dout("note_last_dentry '%s'\n", fi->last_name); 236 return 0; 237 } 238 239 static int ceph_readdir(struct file *filp, void *dirent, filldir_t filldir) 240 { 241 struct ceph_file_info *fi = filp->private_data; 242 struct inode *inode = filp->f_dentry->d_inode; 243 struct ceph_inode_info *ci = ceph_inode(inode); 244 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 245 struct ceph_mds_client *mdsc = fsc->mdsc; 246 unsigned frag = fpos_frag(filp->f_pos); 247 int off = fpos_off(filp->f_pos); 248 int err; 249 u32 ftype; 250 struct ceph_mds_reply_info_parsed *rinfo; 251 const int max_entries = fsc->mount_options->max_readdir; 252 const int max_bytes = fsc->mount_options->max_readdir_bytes; 253 254 dout("readdir %p filp %p frag %u off %u\n", inode, filp, frag, off); 255 if (fi->flags & CEPH_F_ATEND) 256 return 0; 257 258 /* always start with . and .. */ 259 if (filp->f_pos == 0) { 260 /* note dir version at start of readdir so we can tell 261 * if any dentries get dropped */ 262 fi->dir_release_count = ci->i_release_count; 263 264 dout("readdir off 0 -> '.'\n"); 265 if (filldir(dirent, ".", 1, ceph_make_fpos(0, 0), 266 ceph_translate_ino(inode->i_sb, inode->i_ino), 267 inode->i_mode >> 12) < 0) 268 return 0; 269 filp->f_pos = 1; 270 off = 1; 271 } 272 if (filp->f_pos == 1) { 273 ino_t ino = parent_ino(filp->f_dentry); 274 dout("readdir off 1 -> '..'\n"); 275 if (filldir(dirent, "..", 2, ceph_make_fpos(0, 1), 276 ceph_translate_ino(inode->i_sb, ino), 277 inode->i_mode >> 12) < 0) 278 return 0; 279 filp->f_pos = 2; 280 off = 2; 281 } 282 283 /* can we use the dcache? */ 284 spin_lock(&inode->i_lock); 285 if ((filp->f_pos == 2 || fi->dentry) && 286 !ceph_test_mount_opt(fsc, NOASYNCREADDIR) && 287 ceph_snap(inode) != CEPH_SNAPDIR && 288 (ci->i_ceph_flags & CEPH_I_COMPLETE) && 289 __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1)) { 290 spin_unlock(&inode->i_lock); 291 err = __dcache_readdir(filp, dirent, filldir); 292 if (err != -EAGAIN) 293 return err; 294 } else { 295 spin_unlock(&inode->i_lock); 296 } 297 if (fi->dentry) { 298 err = note_last_dentry(fi, fi->dentry->d_name.name, 299 fi->dentry->d_name.len); 300 if (err) 301 return err; 302 dput(fi->dentry); 303 fi->dentry = NULL; 304 } 305 306 /* proceed with a normal readdir */ 307 308 more: 309 /* do we have the correct frag content buffered? */ 310 if (fi->frag != frag || fi->last_readdir == NULL) { 311 struct ceph_mds_request *req; 312 int op = ceph_snap(inode) == CEPH_SNAPDIR ? 313 CEPH_MDS_OP_LSSNAP : CEPH_MDS_OP_READDIR; 314 315 /* discard old result, if any */ 316 if (fi->last_readdir) { 317 ceph_mdsc_put_request(fi->last_readdir); 318 fi->last_readdir = NULL; 319 } 320 321 /* requery frag tree, as the frag topology may have changed */ 322 frag = ceph_choose_frag(ceph_inode(inode), frag, NULL, NULL); 323 324 dout("readdir fetching %llx.%llx frag %x offset '%s'\n", 325 ceph_vinop(inode), frag, fi->last_name); 326 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); 327 if (IS_ERR(req)) 328 return PTR_ERR(req); 329 req->r_inode = inode; 330 ihold(inode); 331 req->r_dentry = dget(filp->f_dentry); 332 /* hints to request -> mds selection code */ 333 req->r_direct_mode = USE_AUTH_MDS; 334 req->r_direct_hash = ceph_frag_value(frag); 335 req->r_direct_is_hash = true; 336 req->r_path2 = kstrdup(fi->last_name, GFP_NOFS); 337 req->r_readdir_offset = fi->next_offset; 338 req->r_args.readdir.frag = cpu_to_le32(frag); 339 req->r_args.readdir.max_entries = cpu_to_le32(max_entries); 340 req->r_args.readdir.max_bytes = cpu_to_le32(max_bytes); 341 req->r_num_caps = max_entries + 1; 342 err = ceph_mdsc_do_request(mdsc, NULL, req); 343 if (err < 0) { 344 ceph_mdsc_put_request(req); 345 return err; 346 } 347 dout("readdir got and parsed readdir result=%d" 348 " on frag %x, end=%d, complete=%d\n", err, frag, 349 (int)req->r_reply_info.dir_end, 350 (int)req->r_reply_info.dir_complete); 351 352 if (!req->r_did_prepopulate) { 353 dout("readdir !did_prepopulate"); 354 fi->dir_release_count--; /* preclude I_COMPLETE */ 355 } 356 357 /* note next offset and last dentry name */ 358 fi->offset = fi->next_offset; 359 fi->last_readdir = req; 360 361 if (req->r_reply_info.dir_end) { 362 kfree(fi->last_name); 363 fi->last_name = NULL; 364 if (ceph_frag_is_rightmost(frag)) 365 fi->next_offset = 2; 366 else 367 fi->next_offset = 0; 368 } else { 369 rinfo = &req->r_reply_info; 370 err = note_last_dentry(fi, 371 rinfo->dir_dname[rinfo->dir_nr-1], 372 rinfo->dir_dname_len[rinfo->dir_nr-1]); 373 if (err) 374 return err; 375 fi->next_offset += rinfo->dir_nr; 376 } 377 } 378 379 rinfo = &fi->last_readdir->r_reply_info; 380 dout("readdir frag %x num %d off %d chunkoff %d\n", frag, 381 rinfo->dir_nr, off, fi->offset); 382 while (off >= fi->offset && off - fi->offset < rinfo->dir_nr) { 383 u64 pos = ceph_make_fpos(frag, off); 384 struct ceph_mds_reply_inode *in = 385 rinfo->dir_in[off - fi->offset].in; 386 struct ceph_vino vino; 387 ino_t ino; 388 389 dout("readdir off %d (%d/%d) -> %lld '%.*s' %p\n", 390 off, off - fi->offset, rinfo->dir_nr, pos, 391 rinfo->dir_dname_len[off - fi->offset], 392 rinfo->dir_dname[off - fi->offset], in); 393 BUG_ON(!in); 394 ftype = le32_to_cpu(in->mode) >> 12; 395 vino.ino = le64_to_cpu(in->ino); 396 vino.snap = le64_to_cpu(in->snapid); 397 ino = ceph_vino_to_ino(vino); 398 if (filldir(dirent, 399 rinfo->dir_dname[off - fi->offset], 400 rinfo->dir_dname_len[off - fi->offset], 401 pos, 402 ceph_translate_ino(inode->i_sb, ino), ftype) < 0) { 403 dout("filldir stopping us...\n"); 404 return 0; 405 } 406 off++; 407 filp->f_pos = pos + 1; 408 } 409 410 if (fi->last_name) { 411 ceph_mdsc_put_request(fi->last_readdir); 412 fi->last_readdir = NULL; 413 goto more; 414 } 415 416 /* more frags? */ 417 if (!ceph_frag_is_rightmost(frag)) { 418 frag = ceph_frag_next(frag); 419 off = 0; 420 filp->f_pos = ceph_make_fpos(frag, off); 421 dout("readdir next frag is %x\n", frag); 422 goto more; 423 } 424 fi->flags |= CEPH_F_ATEND; 425 426 /* 427 * if dir_release_count still matches the dir, no dentries 428 * were released during the whole readdir, and we should have 429 * the complete dir contents in our cache. 430 */ 431 spin_lock(&inode->i_lock); 432 if (ci->i_release_count == fi->dir_release_count) { 433 dout(" marking %p complete\n", inode); 434 /* ci->i_ceph_flags |= CEPH_I_COMPLETE; */ 435 ci->i_max_offset = filp->f_pos; 436 } 437 spin_unlock(&inode->i_lock); 438 439 dout("readdir %p filp %p done.\n", inode, filp); 440 return 0; 441 } 442 443 static void reset_readdir(struct ceph_file_info *fi) 444 { 445 if (fi->last_readdir) { 446 ceph_mdsc_put_request(fi->last_readdir); 447 fi->last_readdir = NULL; 448 } 449 kfree(fi->last_name); 450 fi->last_name = NULL; 451 fi->next_offset = 2; /* compensate for . and .. */ 452 if (fi->dentry) { 453 dput(fi->dentry); 454 fi->dentry = NULL; 455 } 456 fi->flags &= ~CEPH_F_ATEND; 457 } 458 459 static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int origin) 460 { 461 struct ceph_file_info *fi = file->private_data; 462 struct inode *inode = file->f_mapping->host; 463 loff_t old_offset = offset; 464 loff_t retval; 465 466 mutex_lock(&inode->i_mutex); 467 retval = -EINVAL; 468 switch (origin) { 469 case SEEK_END: 470 offset += inode->i_size + 2; /* FIXME */ 471 break; 472 case SEEK_CUR: 473 offset += file->f_pos; 474 case SEEK_SET: 475 break; 476 default: 477 goto out; 478 } 479 480 if (offset >= 0 && offset <= inode->i_sb->s_maxbytes) { 481 if (offset != file->f_pos) { 482 file->f_pos = offset; 483 file->f_version = 0; 484 fi->flags &= ~CEPH_F_ATEND; 485 } 486 retval = offset; 487 488 /* 489 * discard buffered readdir content on seekdir(0), or 490 * seek to new frag, or seek prior to current chunk. 491 */ 492 if (offset == 0 || 493 fpos_frag(offset) != fpos_frag(old_offset) || 494 fpos_off(offset) < fi->offset) { 495 dout("dir_llseek dropping %p content\n", file); 496 reset_readdir(fi); 497 } 498 499 /* bump dir_release_count if we did a forward seek */ 500 if (offset > old_offset) 501 fi->dir_release_count--; 502 } 503 out: 504 mutex_unlock(&inode->i_mutex); 505 return retval; 506 } 507 508 /* 509 * Handle lookups for the hidden .snap directory. 510 */ 511 int ceph_handle_snapdir(struct ceph_mds_request *req, 512 struct dentry *dentry, int err) 513 { 514 struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb); 515 struct inode *parent = dentry->d_parent->d_inode; /* we hold i_mutex */ 516 517 /* .snap dir? */ 518 if (err == -ENOENT && 519 ceph_snap(parent) == CEPH_NOSNAP && 520 strcmp(dentry->d_name.name, 521 fsc->mount_options->snapdir_name) == 0) { 522 struct inode *inode = ceph_get_snapdir(parent); 523 dout("ENOENT on snapdir %p '%.*s', linking to snapdir %p\n", 524 dentry, dentry->d_name.len, dentry->d_name.name, inode); 525 BUG_ON(!d_unhashed(dentry)); 526 d_add(dentry, inode); 527 err = 0; 528 } 529 return err; 530 } 531 532 /* 533 * Figure out final result of a lookup/open request. 534 * 535 * Mainly, make sure we return the final req->r_dentry (if it already 536 * existed) in place of the original VFS-provided dentry when they 537 * differ. 538 * 539 * Gracefully handle the case where the MDS replies with -ENOENT and 540 * no trace (which it may do, at its discretion, e.g., if it doesn't 541 * care to issue a lease on the negative dentry). 542 */ 543 struct dentry *ceph_finish_lookup(struct ceph_mds_request *req, 544 struct dentry *dentry, int err) 545 { 546 if (err == -ENOENT) { 547 /* no trace? */ 548 err = 0; 549 if (!req->r_reply_info.head->is_dentry) { 550 dout("ENOENT and no trace, dentry %p inode %p\n", 551 dentry, dentry->d_inode); 552 if (dentry->d_inode) { 553 d_drop(dentry); 554 err = -ENOENT; 555 } else { 556 d_add(dentry, NULL); 557 } 558 } 559 } 560 if (err) 561 dentry = ERR_PTR(err); 562 else if (dentry != req->r_dentry) 563 dentry = dget(req->r_dentry); /* we got spliced */ 564 else 565 dentry = NULL; 566 return dentry; 567 } 568 569 static int is_root_ceph_dentry(struct inode *inode, struct dentry *dentry) 570 { 571 return ceph_ino(inode) == CEPH_INO_ROOT && 572 strncmp(dentry->d_name.name, ".ceph", 5) == 0; 573 } 574 575 /* 576 * Look up a single dir entry. If there is a lookup intent, inform 577 * the MDS so that it gets our 'caps wanted' value in a single op. 578 */ 579 static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry, 580 struct nameidata *nd) 581 { 582 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); 583 struct ceph_mds_client *mdsc = fsc->mdsc; 584 struct ceph_mds_request *req; 585 int op; 586 int err; 587 588 dout("lookup %p dentry %p '%.*s'\n", 589 dir, dentry, dentry->d_name.len, dentry->d_name.name); 590 591 if (dentry->d_name.len > NAME_MAX) 592 return ERR_PTR(-ENAMETOOLONG); 593 594 err = ceph_init_dentry(dentry); 595 if (err < 0) 596 return ERR_PTR(err); 597 598 /* open (but not create!) intent? */ 599 if (nd && 600 (nd->flags & LOOKUP_OPEN) && 601 !(nd->intent.open.flags & O_CREAT)) { 602 int mode = nd->intent.open.create_mode & ~current->fs->umask; 603 return ceph_lookup_open(dir, dentry, nd, mode, 1); 604 } 605 606 /* can we conclude ENOENT locally? */ 607 if (dentry->d_inode == NULL) { 608 struct ceph_inode_info *ci = ceph_inode(dir); 609 struct ceph_dentry_info *di = ceph_dentry(dentry); 610 611 spin_lock(&dir->i_lock); 612 dout(" dir %p flags are %d\n", dir, ci->i_ceph_flags); 613 if (strncmp(dentry->d_name.name, 614 fsc->mount_options->snapdir_name, 615 dentry->d_name.len) && 616 !is_root_ceph_dentry(dir, dentry) && 617 (ci->i_ceph_flags & CEPH_I_COMPLETE) && 618 (__ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1))) { 619 spin_unlock(&dir->i_lock); 620 dout(" dir %p complete, -ENOENT\n", dir); 621 d_add(dentry, NULL); 622 di->lease_shared_gen = ci->i_shared_gen; 623 return NULL; 624 } 625 spin_unlock(&dir->i_lock); 626 } 627 628 op = ceph_snap(dir) == CEPH_SNAPDIR ? 629 CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP; 630 req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS); 631 if (IS_ERR(req)) 632 return ERR_CAST(req); 633 req->r_dentry = dget(dentry); 634 req->r_num_caps = 2; 635 /* we only need inode linkage */ 636 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE); 637 req->r_locked_dir = dir; 638 err = ceph_mdsc_do_request(mdsc, NULL, req); 639 err = ceph_handle_snapdir(req, dentry, err); 640 dentry = ceph_finish_lookup(req, dentry, err); 641 ceph_mdsc_put_request(req); /* will dput(dentry) */ 642 dout("lookup result=%p\n", dentry); 643 return dentry; 644 } 645 646 /* 647 * If we do a create but get no trace back from the MDS, follow up with 648 * a lookup (the VFS expects us to link up the provided dentry). 649 */ 650 int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry) 651 { 652 struct dentry *result = ceph_lookup(dir, dentry, NULL); 653 654 if (result && !IS_ERR(result)) { 655 /* 656 * We created the item, then did a lookup, and found 657 * it was already linked to another inode we already 658 * had in our cache (and thus got spliced). Link our 659 * dentry to that inode, but don't hash it, just in 660 * case the VFS wants to dereference it. 661 */ 662 BUG_ON(!result->d_inode); 663 d_instantiate(dentry, result->d_inode); 664 return 0; 665 } 666 return PTR_ERR(result); 667 } 668 669 static int ceph_mknod(struct inode *dir, struct dentry *dentry, 670 int mode, dev_t rdev) 671 { 672 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); 673 struct ceph_mds_client *mdsc = fsc->mdsc; 674 struct ceph_mds_request *req; 675 int err; 676 677 if (ceph_snap(dir) != CEPH_NOSNAP) 678 return -EROFS; 679 680 dout("mknod in dir %p dentry %p mode 0%o rdev %d\n", 681 dir, dentry, mode, rdev); 682 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_MKNOD, USE_AUTH_MDS); 683 if (IS_ERR(req)) { 684 d_drop(dentry); 685 return PTR_ERR(req); 686 } 687 req->r_dentry = dget(dentry); 688 req->r_num_caps = 2; 689 req->r_locked_dir = dir; 690 req->r_args.mknod.mode = cpu_to_le32(mode); 691 req->r_args.mknod.rdev = cpu_to_le32(rdev); 692 req->r_dentry_drop = CEPH_CAP_FILE_SHARED; 693 req->r_dentry_unless = CEPH_CAP_FILE_EXCL; 694 err = ceph_mdsc_do_request(mdsc, dir, req); 695 if (!err && !req->r_reply_info.head->is_dentry) 696 err = ceph_handle_notrace_create(dir, dentry); 697 ceph_mdsc_put_request(req); 698 if (err) 699 d_drop(dentry); 700 return err; 701 } 702 703 static int ceph_create(struct inode *dir, struct dentry *dentry, int mode, 704 struct nameidata *nd) 705 { 706 dout("create in dir %p dentry %p name '%.*s'\n", 707 dir, dentry, dentry->d_name.len, dentry->d_name.name); 708 709 if (ceph_snap(dir) != CEPH_NOSNAP) 710 return -EROFS; 711 712 if (nd) { 713 BUG_ON((nd->flags & LOOKUP_OPEN) == 0); 714 dentry = ceph_lookup_open(dir, dentry, nd, mode, 0); 715 /* hrm, what should i do here if we get aliased? */ 716 if (IS_ERR(dentry)) 717 return PTR_ERR(dentry); 718 return 0; 719 } 720 721 /* fall back to mknod */ 722 return ceph_mknod(dir, dentry, (mode & ~S_IFMT) | S_IFREG, 0); 723 } 724 725 static int ceph_symlink(struct inode *dir, struct dentry *dentry, 726 const char *dest) 727 { 728 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); 729 struct ceph_mds_client *mdsc = fsc->mdsc; 730 struct ceph_mds_request *req; 731 int err; 732 733 if (ceph_snap(dir) != CEPH_NOSNAP) 734 return -EROFS; 735 736 dout("symlink in dir %p dentry %p to '%s'\n", dir, dentry, dest); 737 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SYMLINK, USE_AUTH_MDS); 738 if (IS_ERR(req)) { 739 d_drop(dentry); 740 return PTR_ERR(req); 741 } 742 req->r_dentry = dget(dentry); 743 req->r_num_caps = 2; 744 req->r_path2 = kstrdup(dest, GFP_NOFS); 745 req->r_locked_dir = dir; 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 if (err) 753 d_drop(dentry); 754 return err; 755 } 756 757 static int ceph_mkdir(struct inode *dir, struct dentry *dentry, int mode) 758 { 759 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); 760 struct ceph_mds_client *mdsc = fsc->mdsc; 761 struct ceph_mds_request *req; 762 int err = -EROFS; 763 int op; 764 765 if (ceph_snap(dir) == CEPH_SNAPDIR) { 766 /* mkdir .snap/foo is a MKSNAP */ 767 op = CEPH_MDS_OP_MKSNAP; 768 dout("mksnap dir %p snap '%.*s' dn %p\n", dir, 769 dentry->d_name.len, dentry->d_name.name, dentry); 770 } else if (ceph_snap(dir) == CEPH_NOSNAP) { 771 dout("mkdir dir %p dn %p mode 0%o\n", dir, dentry, mode); 772 op = CEPH_MDS_OP_MKDIR; 773 } else { 774 goto out; 775 } 776 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); 777 if (IS_ERR(req)) { 778 err = PTR_ERR(req); 779 goto out; 780 } 781 782 req->r_dentry = dget(dentry); 783 req->r_num_caps = 2; 784 req->r_locked_dir = dir; 785 req->r_args.mkdir.mode = cpu_to_le32(mode); 786 req->r_dentry_drop = CEPH_CAP_FILE_SHARED; 787 req->r_dentry_unless = CEPH_CAP_FILE_EXCL; 788 err = ceph_mdsc_do_request(mdsc, dir, req); 789 if (!err && !req->r_reply_info.head->is_dentry) 790 err = ceph_handle_notrace_create(dir, dentry); 791 ceph_mdsc_put_request(req); 792 out: 793 if (err < 0) 794 d_drop(dentry); 795 return err; 796 } 797 798 static int ceph_link(struct dentry *old_dentry, struct inode *dir, 799 struct dentry *dentry) 800 { 801 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); 802 struct ceph_mds_client *mdsc = fsc->mdsc; 803 struct ceph_mds_request *req; 804 int err; 805 806 if (ceph_snap(dir) != CEPH_NOSNAP) 807 return -EROFS; 808 809 dout("link in dir %p old_dentry %p dentry %p\n", dir, 810 old_dentry, dentry); 811 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LINK, USE_AUTH_MDS); 812 if (IS_ERR(req)) { 813 d_drop(dentry); 814 return PTR_ERR(req); 815 } 816 req->r_dentry = dget(dentry); 817 req->r_num_caps = 2; 818 req->r_old_dentry = dget(old_dentry); /* or inode? hrm. */ 819 req->r_old_dentry_dir = ceph_get_dentry_parent_inode(old_dentry); 820 req->r_locked_dir = dir; 821 req->r_dentry_drop = CEPH_CAP_FILE_SHARED; 822 req->r_dentry_unless = CEPH_CAP_FILE_EXCL; 823 err = ceph_mdsc_do_request(mdsc, dir, req); 824 if (err) { 825 d_drop(dentry); 826 } else if (!req->r_reply_info.head->is_dentry) { 827 ihold(old_dentry->d_inode); 828 d_instantiate(dentry, old_dentry->d_inode); 829 } 830 ceph_mdsc_put_request(req); 831 return err; 832 } 833 834 /* 835 * For a soon-to-be unlinked file, drop the AUTH_RDCACHE caps. If it 836 * looks like the link count will hit 0, drop any other caps (other 837 * than PIN) we don't specifically want (due to the file still being 838 * open). 839 */ 840 static int drop_caps_for_unlink(struct inode *inode) 841 { 842 struct ceph_inode_info *ci = ceph_inode(inode); 843 int drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL; 844 845 spin_lock(&inode->i_lock); 846 if (inode->i_nlink == 1) { 847 drop |= ~(__ceph_caps_wanted(ci) | CEPH_CAP_PIN); 848 ci->i_ceph_flags |= CEPH_I_NODELAY; 849 } 850 spin_unlock(&inode->i_lock); 851 return drop; 852 } 853 854 /* 855 * rmdir and unlink are differ only by the metadata op code 856 */ 857 static int ceph_unlink(struct inode *dir, struct dentry *dentry) 858 { 859 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); 860 struct ceph_mds_client *mdsc = fsc->mdsc; 861 struct inode *inode = dentry->d_inode; 862 struct ceph_mds_request *req; 863 int err = -EROFS; 864 int op; 865 866 if (ceph_snap(dir) == CEPH_SNAPDIR) { 867 /* rmdir .snap/foo is RMSNAP */ 868 dout("rmsnap dir %p '%.*s' dn %p\n", dir, dentry->d_name.len, 869 dentry->d_name.name, dentry); 870 op = CEPH_MDS_OP_RMSNAP; 871 } else if (ceph_snap(dir) == CEPH_NOSNAP) { 872 dout("unlink/rmdir dir %p dn %p inode %p\n", 873 dir, dentry, inode); 874 op = ((dentry->d_inode->i_mode & S_IFMT) == S_IFDIR) ? 875 CEPH_MDS_OP_RMDIR : CEPH_MDS_OP_UNLINK; 876 } else 877 goto out; 878 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); 879 if (IS_ERR(req)) { 880 err = PTR_ERR(req); 881 goto out; 882 } 883 req->r_dentry = dget(dentry); 884 req->r_num_caps = 2; 885 req->r_locked_dir = dir; 886 req->r_dentry_drop = CEPH_CAP_FILE_SHARED; 887 req->r_dentry_unless = CEPH_CAP_FILE_EXCL; 888 req->r_inode_drop = drop_caps_for_unlink(inode); 889 err = ceph_mdsc_do_request(mdsc, dir, req); 890 if (!err && !req->r_reply_info.head->is_dentry) 891 d_delete(dentry); 892 ceph_mdsc_put_request(req); 893 out: 894 return err; 895 } 896 897 static int ceph_rename(struct inode *old_dir, struct dentry *old_dentry, 898 struct inode *new_dir, struct dentry *new_dentry) 899 { 900 struct ceph_fs_client *fsc = ceph_sb_to_client(old_dir->i_sb); 901 struct ceph_mds_client *mdsc = fsc->mdsc; 902 struct ceph_mds_request *req; 903 int err; 904 905 if (ceph_snap(old_dir) != ceph_snap(new_dir)) 906 return -EXDEV; 907 if (ceph_snap(old_dir) != CEPH_NOSNAP || 908 ceph_snap(new_dir) != CEPH_NOSNAP) 909 return -EROFS; 910 dout("rename dir %p dentry %p to dir %p dentry %p\n", 911 old_dir, old_dentry, new_dir, new_dentry); 912 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_RENAME, USE_AUTH_MDS); 913 if (IS_ERR(req)) 914 return PTR_ERR(req); 915 req->r_dentry = dget(new_dentry); 916 req->r_num_caps = 2; 917 req->r_old_dentry = dget(old_dentry); 918 req->r_old_dentry_dir = ceph_get_dentry_parent_inode(old_dentry); 919 req->r_locked_dir = new_dir; 920 req->r_old_dentry_drop = CEPH_CAP_FILE_SHARED; 921 req->r_old_dentry_unless = CEPH_CAP_FILE_EXCL; 922 req->r_dentry_drop = CEPH_CAP_FILE_SHARED; 923 req->r_dentry_unless = CEPH_CAP_FILE_EXCL; 924 /* release LINK_RDCACHE on source inode (mds will lock it) */ 925 req->r_old_inode_drop = CEPH_CAP_LINK_SHARED; 926 if (new_dentry->d_inode) 927 req->r_inode_drop = drop_caps_for_unlink(new_dentry->d_inode); 928 err = ceph_mdsc_do_request(mdsc, old_dir, req); 929 if (!err && !req->r_reply_info.head->is_dentry) { 930 /* 931 * Normally d_move() is done by fill_trace (called by 932 * do_request, above). If there is no trace, we need 933 * to do it here. 934 */ 935 936 /* d_move screws up d_subdirs order */ 937 ceph_i_clear(new_dir, CEPH_I_COMPLETE); 938 939 d_move(old_dentry, new_dentry); 940 941 /* ensure target dentry is invalidated, despite 942 rehashing bug in vfs_rename_dir */ 943 ceph_invalidate_dentry_lease(new_dentry); 944 } 945 ceph_mdsc_put_request(req); 946 return err; 947 } 948 949 /* 950 * Ensure a dentry lease will no longer revalidate. 951 */ 952 void ceph_invalidate_dentry_lease(struct dentry *dentry) 953 { 954 spin_lock(&dentry->d_lock); 955 dentry->d_time = jiffies; 956 ceph_dentry(dentry)->lease_shared_gen = 0; 957 spin_unlock(&dentry->d_lock); 958 } 959 960 /* 961 * Check if dentry lease is valid. If not, delete the lease. Try to 962 * renew if the least is more than half up. 963 */ 964 static int dentry_lease_is_valid(struct dentry *dentry) 965 { 966 struct ceph_dentry_info *di; 967 struct ceph_mds_session *s; 968 int valid = 0; 969 u32 gen; 970 unsigned long ttl; 971 struct ceph_mds_session *session = NULL; 972 struct inode *dir = NULL; 973 u32 seq = 0; 974 975 spin_lock(&dentry->d_lock); 976 di = ceph_dentry(dentry); 977 if (di && di->lease_session) { 978 s = di->lease_session; 979 spin_lock(&s->s_cap_lock); 980 gen = s->s_cap_gen; 981 ttl = s->s_cap_ttl; 982 spin_unlock(&s->s_cap_lock); 983 984 if (di->lease_gen == gen && 985 time_before(jiffies, dentry->d_time) && 986 time_before(jiffies, ttl)) { 987 valid = 1; 988 if (di->lease_renew_after && 989 time_after(jiffies, di->lease_renew_after)) { 990 /* we should renew */ 991 dir = dentry->d_parent->d_inode; 992 session = ceph_get_mds_session(s); 993 seq = di->lease_seq; 994 di->lease_renew_after = 0; 995 di->lease_renew_from = jiffies; 996 } 997 } 998 } 999 spin_unlock(&dentry->d_lock); 1000 1001 if (session) { 1002 ceph_mdsc_lease_send_msg(session, dir, dentry, 1003 CEPH_MDS_LEASE_RENEW, seq); 1004 ceph_put_mds_session(session); 1005 } 1006 dout("dentry_lease_is_valid - dentry %p = %d\n", dentry, valid); 1007 return valid; 1008 } 1009 1010 /* 1011 * Check if directory-wide content lease/cap is valid. 1012 */ 1013 static int dir_lease_is_valid(struct inode *dir, struct dentry *dentry) 1014 { 1015 struct ceph_inode_info *ci = ceph_inode(dir); 1016 struct ceph_dentry_info *di = ceph_dentry(dentry); 1017 int valid = 0; 1018 1019 spin_lock(&dir->i_lock); 1020 if (ci->i_shared_gen == di->lease_shared_gen) 1021 valid = __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1); 1022 spin_unlock(&dir->i_lock); 1023 dout("dir_lease_is_valid dir %p v%u dentry %p v%u = %d\n", 1024 dir, (unsigned)ci->i_shared_gen, dentry, 1025 (unsigned)di->lease_shared_gen, valid); 1026 return valid; 1027 } 1028 1029 /* 1030 * Check if cached dentry can be trusted. 1031 */ 1032 static int ceph_d_revalidate(struct dentry *dentry, struct nameidata *nd) 1033 { 1034 int valid = 0; 1035 struct inode *dir; 1036 1037 if (nd && nd->flags & LOOKUP_RCU) 1038 return -ECHILD; 1039 1040 dout("d_revalidate %p '%.*s' inode %p offset %lld\n", dentry, 1041 dentry->d_name.len, dentry->d_name.name, dentry->d_inode, 1042 ceph_dentry(dentry)->offset); 1043 1044 dir = ceph_get_dentry_parent_inode(dentry); 1045 1046 /* always trust cached snapped dentries, snapdir dentry */ 1047 if (ceph_snap(dir) != CEPH_NOSNAP) { 1048 dout("d_revalidate %p '%.*s' inode %p is SNAPPED\n", dentry, 1049 dentry->d_name.len, dentry->d_name.name, dentry->d_inode); 1050 valid = 1; 1051 } else if (dentry->d_inode && 1052 ceph_snap(dentry->d_inode) == CEPH_SNAPDIR) { 1053 valid = 1; 1054 } else if (dentry_lease_is_valid(dentry) || 1055 dir_lease_is_valid(dir, dentry)) { 1056 valid = 1; 1057 } 1058 1059 dout("d_revalidate %p %s\n", dentry, valid ? "valid" : "invalid"); 1060 if (valid) 1061 ceph_dentry_lru_touch(dentry); 1062 else 1063 d_drop(dentry); 1064 iput(dir); 1065 return valid; 1066 } 1067 1068 /* 1069 * Release our ceph_dentry_info. 1070 */ 1071 static void ceph_d_release(struct dentry *dentry) 1072 { 1073 struct ceph_dentry_info *di = ceph_dentry(dentry); 1074 1075 dout("d_release %p\n", dentry); 1076 if (di) { 1077 ceph_dentry_lru_del(dentry); 1078 if (di->lease_session) 1079 ceph_put_mds_session(di->lease_session); 1080 kmem_cache_free(ceph_dentry_cachep, di); 1081 dentry->d_fsdata = NULL; 1082 } 1083 } 1084 1085 static int ceph_snapdir_d_revalidate(struct dentry *dentry, 1086 struct nameidata *nd) 1087 { 1088 /* 1089 * Eventually, we'll want to revalidate snapped metadata 1090 * too... probably... 1091 */ 1092 return 1; 1093 } 1094 1095 1096 1097 /* 1098 * read() on a dir. This weird interface hack only works if mounted 1099 * with '-o dirstat'. 1100 */ 1101 static ssize_t ceph_read_dir(struct file *file, char __user *buf, size_t size, 1102 loff_t *ppos) 1103 { 1104 struct ceph_file_info *cf = file->private_data; 1105 struct inode *inode = file->f_dentry->d_inode; 1106 struct ceph_inode_info *ci = ceph_inode(inode); 1107 int left; 1108 const int bufsize = 1024; 1109 1110 if (!ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb), DIRSTAT)) 1111 return -EISDIR; 1112 1113 if (!cf->dir_info) { 1114 cf->dir_info = kmalloc(bufsize, GFP_NOFS); 1115 if (!cf->dir_info) 1116 return -ENOMEM; 1117 cf->dir_info_len = 1118 snprintf(cf->dir_info, bufsize, 1119 "entries: %20lld\n" 1120 " files: %20lld\n" 1121 " subdirs: %20lld\n" 1122 "rentries: %20lld\n" 1123 " rfiles: %20lld\n" 1124 " rsubdirs: %20lld\n" 1125 "rbytes: %20lld\n" 1126 "rctime: %10ld.%09ld\n", 1127 ci->i_files + ci->i_subdirs, 1128 ci->i_files, 1129 ci->i_subdirs, 1130 ci->i_rfiles + ci->i_rsubdirs, 1131 ci->i_rfiles, 1132 ci->i_rsubdirs, 1133 ci->i_rbytes, 1134 (long)ci->i_rctime.tv_sec, 1135 (long)ci->i_rctime.tv_nsec); 1136 } 1137 1138 if (*ppos >= cf->dir_info_len) 1139 return 0; 1140 size = min_t(unsigned, size, cf->dir_info_len-*ppos); 1141 left = copy_to_user(buf, cf->dir_info + *ppos, size); 1142 if (left == size) 1143 return -EFAULT; 1144 *ppos += (size - left); 1145 return size - left; 1146 } 1147 1148 /* 1149 * an fsync() on a dir will wait for any uncommitted directory 1150 * operations to commit. 1151 */ 1152 static int ceph_dir_fsync(struct file *file, loff_t start, loff_t end, 1153 int datasync) 1154 { 1155 struct inode *inode = file->f_path.dentry->d_inode; 1156 struct ceph_inode_info *ci = ceph_inode(inode); 1157 struct list_head *head = &ci->i_unsafe_dirops; 1158 struct ceph_mds_request *req; 1159 u64 last_tid; 1160 int ret = 0; 1161 1162 dout("dir_fsync %p\n", inode); 1163 ret = filemap_write_and_wait_range(inode->i_mapping, start, end); 1164 if (ret) 1165 return ret; 1166 mutex_lock(&inode->i_mutex); 1167 1168 spin_lock(&ci->i_unsafe_lock); 1169 if (list_empty(head)) 1170 goto out; 1171 1172 req = list_entry(head->prev, 1173 struct ceph_mds_request, r_unsafe_dir_item); 1174 last_tid = req->r_tid; 1175 1176 do { 1177 ceph_mdsc_get_request(req); 1178 spin_unlock(&ci->i_unsafe_lock); 1179 dout("dir_fsync %p wait on tid %llu (until %llu)\n", 1180 inode, req->r_tid, last_tid); 1181 if (req->r_timeout) { 1182 ret = wait_for_completion_timeout( 1183 &req->r_safe_completion, req->r_timeout); 1184 if (ret > 0) 1185 ret = 0; 1186 else if (ret == 0) 1187 ret = -EIO; /* timed out */ 1188 } else { 1189 wait_for_completion(&req->r_safe_completion); 1190 } 1191 spin_lock(&ci->i_unsafe_lock); 1192 ceph_mdsc_put_request(req); 1193 1194 if (ret || list_empty(head)) 1195 break; 1196 req = list_entry(head->next, 1197 struct ceph_mds_request, r_unsafe_dir_item); 1198 } while (req->r_tid < last_tid); 1199 out: 1200 spin_unlock(&ci->i_unsafe_lock); 1201 mutex_unlock(&inode->i_mutex); 1202 1203 return ret; 1204 } 1205 1206 /* 1207 * We maintain a private dentry LRU. 1208 * 1209 * FIXME: this needs to be changed to a per-mds lru to be useful. 1210 */ 1211 void ceph_dentry_lru_add(struct dentry *dn) 1212 { 1213 struct ceph_dentry_info *di = ceph_dentry(dn); 1214 struct ceph_mds_client *mdsc; 1215 1216 dout("dentry_lru_add %p %p '%.*s'\n", di, dn, 1217 dn->d_name.len, dn->d_name.name); 1218 if (di) { 1219 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc; 1220 spin_lock(&mdsc->dentry_lru_lock); 1221 list_add_tail(&di->lru, &mdsc->dentry_lru); 1222 mdsc->num_dentry++; 1223 spin_unlock(&mdsc->dentry_lru_lock); 1224 } 1225 } 1226 1227 void ceph_dentry_lru_touch(struct dentry *dn) 1228 { 1229 struct ceph_dentry_info *di = ceph_dentry(dn); 1230 struct ceph_mds_client *mdsc; 1231 1232 dout("dentry_lru_touch %p %p '%.*s' (offset %lld)\n", di, dn, 1233 dn->d_name.len, dn->d_name.name, di->offset); 1234 if (di) { 1235 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc; 1236 spin_lock(&mdsc->dentry_lru_lock); 1237 list_move_tail(&di->lru, &mdsc->dentry_lru); 1238 spin_unlock(&mdsc->dentry_lru_lock); 1239 } 1240 } 1241 1242 void ceph_dentry_lru_del(struct dentry *dn) 1243 { 1244 struct ceph_dentry_info *di = ceph_dentry(dn); 1245 struct ceph_mds_client *mdsc; 1246 1247 dout("dentry_lru_del %p %p '%.*s'\n", di, dn, 1248 dn->d_name.len, dn->d_name.name); 1249 if (di) { 1250 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc; 1251 spin_lock(&mdsc->dentry_lru_lock); 1252 list_del_init(&di->lru); 1253 mdsc->num_dentry--; 1254 spin_unlock(&mdsc->dentry_lru_lock); 1255 } 1256 } 1257 1258 /* 1259 * Return name hash for a given dentry. This is dependent on 1260 * the parent directory's hash function. 1261 */ 1262 unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn) 1263 { 1264 struct ceph_inode_info *dci = ceph_inode(dir); 1265 1266 switch (dci->i_dir_layout.dl_dir_hash) { 1267 case 0: /* for backward compat */ 1268 case CEPH_STR_HASH_LINUX: 1269 return dn->d_name.hash; 1270 1271 default: 1272 return ceph_str_hash(dci->i_dir_layout.dl_dir_hash, 1273 dn->d_name.name, dn->d_name.len); 1274 } 1275 } 1276 1277 const struct file_operations ceph_dir_fops = { 1278 .read = ceph_read_dir, 1279 .readdir = ceph_readdir, 1280 .llseek = ceph_dir_llseek, 1281 .open = ceph_open, 1282 .release = ceph_release, 1283 .unlocked_ioctl = ceph_ioctl, 1284 .fsync = ceph_dir_fsync, 1285 }; 1286 1287 const struct inode_operations ceph_dir_iops = { 1288 .lookup = ceph_lookup, 1289 .permission = ceph_permission, 1290 .getattr = ceph_getattr, 1291 .setattr = ceph_setattr, 1292 .setxattr = ceph_setxattr, 1293 .getxattr = ceph_getxattr, 1294 .listxattr = ceph_listxattr, 1295 .removexattr = ceph_removexattr, 1296 .mknod = ceph_mknod, 1297 .symlink = ceph_symlink, 1298 .mkdir = ceph_mkdir, 1299 .link = ceph_link, 1300 .unlink = ceph_unlink, 1301 .rmdir = ceph_unlink, 1302 .rename = ceph_rename, 1303 .create = ceph_create, 1304 }; 1305 1306 const struct dentry_operations ceph_dentry_ops = { 1307 .d_revalidate = ceph_d_revalidate, 1308 .d_release = ceph_d_release, 1309 }; 1310 1311 const struct dentry_operations ceph_snapdir_dentry_ops = { 1312 .d_revalidate = ceph_snapdir_d_revalidate, 1313 .d_release = ceph_d_release, 1314 }; 1315 1316 const struct dentry_operations ceph_snap_dentry_ops = { 1317 .d_release = ceph_d_release, 1318 }; 1319