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 (ceph_snap(dentry->d_parent->d_inode) == CEPH_NOSNAP) 55 d_set_d_op(dentry, &ceph_dentry_ops); 56 else if (ceph_snap(dentry->d_parent->d_inode) == CEPH_SNAPDIR) 57 d_set_d_op(dentry, &ceph_snapdir_dentry_ops); 58 else 59 d_set_d_op(dentry, &ceph_snap_dentry_ops); 60 61 di->dentry = dentry; 62 di->lease_session = NULL; 63 dentry->d_time = jiffies; 64 /* avoid reordering d_fsdata setup so that the check above is safe */ 65 smp_mb(); 66 dentry->d_fsdata = di; 67 ceph_dentry_lru_add(dentry); 68 out_unlock: 69 spin_unlock(&dentry->d_lock); 70 return 0; 71 } 72 73 struct inode *ceph_get_dentry_parent_inode(struct dentry *dentry) 74 { 75 struct inode *inode = NULL; 76 77 if (!dentry) 78 return NULL; 79 80 spin_lock(&dentry->d_lock); 81 if (!IS_ROOT(dentry)) { 82 inode = dentry->d_parent->d_inode; 83 ihold(inode); 84 } 85 spin_unlock(&dentry->d_lock); 86 return inode; 87 } 88 89 90 /* 91 * for readdir, we encode the directory frag and offset within that 92 * frag into f_pos. 93 */ 94 static unsigned fpos_frag(loff_t p) 95 { 96 return p >> 32; 97 } 98 static unsigned fpos_off(loff_t p) 99 { 100 return p & 0xffffffff; 101 } 102 103 static int fpos_cmp(loff_t l, loff_t r) 104 { 105 int v = ceph_frag_compare(fpos_frag(l), fpos_frag(r)); 106 if (v) 107 return v; 108 return (int)(fpos_off(l) - fpos_off(r)); 109 } 110 111 /* 112 * When possible, we try to satisfy a readdir by peeking at the 113 * dcache. We make this work by carefully ordering dentries on 114 * d_u.d_child when we initially get results back from the MDS, and 115 * falling back to a "normal" sync readdir if any dentries in the dir 116 * are dropped. 117 * 118 * Complete dir indicates that we have all dentries in the dir. It is 119 * defined IFF we hold CEPH_CAP_FILE_SHARED (which will be revoked by 120 * the MDS if/when the directory is modified). 121 */ 122 static int __dcache_readdir(struct file *file, struct dir_context *ctx) 123 { 124 struct ceph_file_info *fi = file->private_data; 125 struct dentry *parent = file->f_dentry; 126 struct inode *dir = parent->d_inode; 127 struct list_head *p; 128 struct dentry *dentry, *last; 129 struct ceph_dentry_info *di; 130 int err = 0; 131 132 /* claim ref on last dentry we returned */ 133 last = fi->dentry; 134 fi->dentry = NULL; 135 136 dout("__dcache_readdir %p at %llu (last %p)\n", dir, ctx->pos, 137 last); 138 139 spin_lock(&parent->d_lock); 140 141 /* start at beginning? */ 142 if (ctx->pos == 2 || last == NULL || 143 ctx->pos < ceph_dentry(last)->offset) { 144 if (list_empty(&parent->d_subdirs)) 145 goto out_unlock; 146 p = parent->d_subdirs.prev; 147 dout(" initial p %p/%p\n", p->prev, p->next); 148 } else { 149 p = last->d_u.d_child.prev; 150 } 151 152 more: 153 dentry = list_entry(p, struct dentry, d_u.d_child); 154 di = ceph_dentry(dentry); 155 while (1) { 156 dout(" p %p/%p %s d_subdirs %p/%p\n", p->prev, p->next, 157 d_unhashed(dentry) ? "!hashed" : "hashed", 158 parent->d_subdirs.prev, parent->d_subdirs.next); 159 if (p == &parent->d_subdirs) { 160 fi->flags |= CEPH_F_ATEND; 161 goto out_unlock; 162 } 163 spin_lock_nested(&dentry->d_lock, DENTRY_D_LOCK_NESTED); 164 if (!d_unhashed(dentry) && dentry->d_inode && 165 ceph_snap(dentry->d_inode) != CEPH_SNAPDIR && 166 ceph_ino(dentry->d_inode) != CEPH_INO_CEPH && 167 fpos_cmp(ctx->pos, di->offset) <= 0) 168 break; 169 dout(" skipping %p %.*s at %llu (%llu)%s%s\n", dentry, 170 dentry->d_name.len, dentry->d_name.name, di->offset, 171 ctx->pos, d_unhashed(dentry) ? " unhashed" : "", 172 !dentry->d_inode ? " null" : ""); 173 spin_unlock(&dentry->d_lock); 174 p = p->prev; 175 dentry = list_entry(p, struct dentry, d_u.d_child); 176 di = ceph_dentry(dentry); 177 } 178 179 dget_dlock(dentry); 180 spin_unlock(&dentry->d_lock); 181 spin_unlock(&parent->d_lock); 182 183 dout(" %llu (%llu) dentry %p %.*s %p\n", di->offset, ctx->pos, 184 dentry, dentry->d_name.len, dentry->d_name.name, dentry->d_inode); 185 ctx->pos = di->offset; 186 if (!dir_emit(ctx, dentry->d_name.name, 187 dentry->d_name.len, 188 ceph_translate_ino(dentry->d_sb, dentry->d_inode->i_ino), 189 dentry->d_inode->i_mode >> 12)) { 190 if (last) { 191 /* remember our position */ 192 fi->dentry = last; 193 fi->next_offset = di->offset; 194 } 195 dput(dentry); 196 return 0; 197 } 198 199 if (last) 200 dput(last); 201 last = dentry; 202 203 ctx->pos++; 204 205 /* make sure a dentry wasn't dropped while we didn't have parent lock */ 206 if (!ceph_dir_is_complete(dir)) { 207 dout(" lost dir complete on %p; falling back to mds\n", dir); 208 err = -EAGAIN; 209 goto out; 210 } 211 212 spin_lock(&parent->d_lock); 213 p = p->prev; /* advance to next dentry */ 214 goto more; 215 216 out_unlock: 217 spin_unlock(&parent->d_lock); 218 out: 219 if (last) 220 dput(last); 221 return err; 222 } 223 224 /* 225 * make note of the last dentry we read, so we can 226 * continue at the same lexicographical point, 227 * regardless of what dir changes take place on the 228 * server. 229 */ 230 static int note_last_dentry(struct ceph_file_info *fi, const char *name, 231 int len) 232 { 233 kfree(fi->last_name); 234 fi->last_name = kmalloc(len+1, GFP_NOFS); 235 if (!fi->last_name) 236 return -ENOMEM; 237 memcpy(fi->last_name, name, len); 238 fi->last_name[len] = 0; 239 dout("note_last_dentry '%s'\n", fi->last_name); 240 return 0; 241 } 242 243 static int ceph_readdir(struct file *file, struct dir_context *ctx) 244 { 245 struct ceph_file_info *fi = file->private_data; 246 struct inode *inode = file_inode(file); 247 struct ceph_inode_info *ci = ceph_inode(inode); 248 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 249 struct ceph_mds_client *mdsc = fsc->mdsc; 250 unsigned frag = fpos_frag(ctx->pos); 251 int off = fpos_off(ctx->pos); 252 int err; 253 u32 ftype; 254 struct ceph_mds_reply_info_parsed *rinfo; 255 const int max_entries = fsc->mount_options->max_readdir; 256 const int max_bytes = fsc->mount_options->max_readdir_bytes; 257 258 dout("readdir %p file %p frag %u off %u\n", inode, file, frag, off); 259 if (fi->flags & CEPH_F_ATEND) 260 return 0; 261 262 /* always start with . and .. */ 263 if (ctx->pos == 0) { 264 /* note dir version at start of readdir so we can tell 265 * if any dentries get dropped */ 266 fi->dir_release_count = atomic_read(&ci->i_release_count); 267 268 dout("readdir off 0 -> '.'\n"); 269 if (!dir_emit(ctx, ".", 1, 270 ceph_translate_ino(inode->i_sb, inode->i_ino), 271 inode->i_mode >> 12)) 272 return 0; 273 ctx->pos = 1; 274 off = 1; 275 } 276 if (ctx->pos == 1) { 277 ino_t ino = parent_ino(file->f_dentry); 278 dout("readdir off 1 -> '..'\n"); 279 if (!dir_emit(ctx, "..", 2, 280 ceph_translate_ino(inode->i_sb, ino), 281 inode->i_mode >> 12)) 282 return 0; 283 ctx->pos = 2; 284 off = 2; 285 } 286 287 /* can we use the dcache? */ 288 spin_lock(&ci->i_ceph_lock); 289 if ((ctx->pos == 2 || fi->dentry) && 290 !ceph_test_mount_opt(fsc, NOASYNCREADDIR) && 291 ceph_snap(inode) != CEPH_SNAPDIR && 292 __ceph_dir_is_complete(ci) && 293 __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1)) { 294 spin_unlock(&ci->i_ceph_lock); 295 err = __dcache_readdir(file, ctx); 296 if (err != -EAGAIN) 297 return err; 298 } else { 299 spin_unlock(&ci->i_ceph_lock); 300 } 301 if (fi->dentry) { 302 err = note_last_dentry(fi, fi->dentry->d_name.name, 303 fi->dentry->d_name.len); 304 if (err) 305 return err; 306 dput(fi->dentry); 307 fi->dentry = NULL; 308 } 309 310 /* proceed with a normal readdir */ 311 312 more: 313 /* do we have the correct frag content buffered? */ 314 if (fi->frag != frag || fi->last_readdir == NULL) { 315 struct ceph_mds_request *req; 316 int op = ceph_snap(inode) == CEPH_SNAPDIR ? 317 CEPH_MDS_OP_LSSNAP : CEPH_MDS_OP_READDIR; 318 319 /* discard old result, if any */ 320 if (fi->last_readdir) { 321 ceph_mdsc_put_request(fi->last_readdir); 322 fi->last_readdir = NULL; 323 } 324 325 /* requery frag tree, as the frag topology may have changed */ 326 frag = ceph_choose_frag(ceph_inode(inode), frag, NULL, NULL); 327 328 dout("readdir fetching %llx.%llx frag %x offset '%s'\n", 329 ceph_vinop(inode), frag, fi->last_name); 330 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); 331 if (IS_ERR(req)) 332 return PTR_ERR(req); 333 req->r_inode = inode; 334 ihold(inode); 335 req->r_dentry = dget(file->f_dentry); 336 /* hints to request -> mds selection code */ 337 req->r_direct_mode = USE_AUTH_MDS; 338 req->r_direct_hash = ceph_frag_value(frag); 339 req->r_direct_is_hash = true; 340 req->r_path2 = kstrdup(fi->last_name, GFP_NOFS); 341 req->r_readdir_offset = fi->next_offset; 342 req->r_args.readdir.frag = cpu_to_le32(frag); 343 req->r_args.readdir.max_entries = cpu_to_le32(max_entries); 344 req->r_args.readdir.max_bytes = cpu_to_le32(max_bytes); 345 req->r_num_caps = max_entries + 1; 346 err = ceph_mdsc_do_request(mdsc, NULL, req); 347 if (err < 0) { 348 ceph_mdsc_put_request(req); 349 return err; 350 } 351 dout("readdir got and parsed readdir result=%d" 352 " on frag %x, end=%d, complete=%d\n", err, frag, 353 (int)req->r_reply_info.dir_end, 354 (int)req->r_reply_info.dir_complete); 355 356 if (!req->r_did_prepopulate) { 357 dout("readdir !did_prepopulate"); 358 /* preclude from marking dir complete */ 359 fi->dir_release_count--; 360 } 361 362 /* note next offset and last dentry name */ 363 rinfo = &req->r_reply_info; 364 if (le32_to_cpu(rinfo->dir_dir->frag) != frag) { 365 frag = le32_to_cpu(rinfo->dir_dir->frag); 366 if (ceph_frag_is_leftmost(frag)) 367 fi->next_offset = 2; 368 else 369 fi->next_offset = 0; 370 off = fi->next_offset; 371 } 372 fi->offset = fi->next_offset; 373 fi->last_readdir = req; 374 fi->frag = frag; 375 376 if (req->r_reply_info.dir_end) { 377 kfree(fi->last_name); 378 fi->last_name = NULL; 379 if (ceph_frag_is_rightmost(frag)) 380 fi->next_offset = 2; 381 else 382 fi->next_offset = 0; 383 } else { 384 err = note_last_dentry(fi, 385 rinfo->dir_dname[rinfo->dir_nr-1], 386 rinfo->dir_dname_len[rinfo->dir_nr-1]); 387 if (err) 388 return err; 389 fi->next_offset += rinfo->dir_nr; 390 } 391 } 392 393 rinfo = &fi->last_readdir->r_reply_info; 394 dout("readdir frag %x num %d off %d chunkoff %d\n", frag, 395 rinfo->dir_nr, off, fi->offset); 396 397 ctx->pos = ceph_make_fpos(frag, off); 398 while (off >= fi->offset && off - fi->offset < rinfo->dir_nr) { 399 struct ceph_mds_reply_inode *in = 400 rinfo->dir_in[off - fi->offset].in; 401 struct ceph_vino vino; 402 ino_t ino; 403 404 dout("readdir off %d (%d/%d) -> %lld '%.*s' %p\n", 405 off, off - fi->offset, rinfo->dir_nr, ctx->pos, 406 rinfo->dir_dname_len[off - fi->offset], 407 rinfo->dir_dname[off - fi->offset], in); 408 BUG_ON(!in); 409 ftype = le32_to_cpu(in->mode) >> 12; 410 vino.ino = le64_to_cpu(in->ino); 411 vino.snap = le64_to_cpu(in->snapid); 412 ino = ceph_vino_to_ino(vino); 413 if (!dir_emit(ctx, 414 rinfo->dir_dname[off - fi->offset], 415 rinfo->dir_dname_len[off - fi->offset], 416 ceph_translate_ino(inode->i_sb, ino), ftype)) { 417 dout("filldir stopping us...\n"); 418 return 0; 419 } 420 off++; 421 ctx->pos++; 422 } 423 424 if (fi->last_name) { 425 ceph_mdsc_put_request(fi->last_readdir); 426 fi->last_readdir = NULL; 427 goto more; 428 } 429 430 /* more frags? */ 431 if (!ceph_frag_is_rightmost(frag)) { 432 frag = ceph_frag_next(frag); 433 off = 0; 434 ctx->pos = ceph_make_fpos(frag, off); 435 dout("readdir next frag is %x\n", frag); 436 goto more; 437 } 438 fi->flags |= CEPH_F_ATEND; 439 440 /* 441 * if dir_release_count still matches the dir, no dentries 442 * were released during the whole readdir, and we should have 443 * the complete dir contents in our cache. 444 */ 445 spin_lock(&ci->i_ceph_lock); 446 if (atomic_read(&ci->i_release_count) == fi->dir_release_count) { 447 dout(" marking %p complete\n", inode); 448 __ceph_dir_set_complete(ci, fi->dir_release_count); 449 ci->i_max_offset = ctx->pos; 450 } 451 spin_unlock(&ci->i_ceph_lock); 452 453 dout("readdir %p file %p done.\n", inode, file); 454 return 0; 455 } 456 457 static void reset_readdir(struct ceph_file_info *fi) 458 { 459 if (fi->last_readdir) { 460 ceph_mdsc_put_request(fi->last_readdir); 461 fi->last_readdir = NULL; 462 } 463 kfree(fi->last_name); 464 fi->last_name = NULL; 465 fi->next_offset = 2; /* compensate for . and .. */ 466 if (fi->dentry) { 467 dput(fi->dentry); 468 fi->dentry = NULL; 469 } 470 fi->flags &= ~CEPH_F_ATEND; 471 } 472 473 static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int whence) 474 { 475 struct ceph_file_info *fi = file->private_data; 476 struct inode *inode = file->f_mapping->host; 477 loff_t old_offset = offset; 478 loff_t retval; 479 480 mutex_lock(&inode->i_mutex); 481 retval = -EINVAL; 482 switch (whence) { 483 case SEEK_END: 484 offset += inode->i_size + 2; /* FIXME */ 485 break; 486 case SEEK_CUR: 487 offset += file->f_pos; 488 case SEEK_SET: 489 break; 490 default: 491 goto out; 492 } 493 494 if (offset >= 0 && offset <= inode->i_sb->s_maxbytes) { 495 if (offset != file->f_pos) { 496 file->f_pos = offset; 497 file->f_version = 0; 498 fi->flags &= ~CEPH_F_ATEND; 499 } 500 retval = offset; 501 502 /* 503 * discard buffered readdir content on seekdir(0), or 504 * seek to new frag, or seek prior to current chunk. 505 */ 506 if (offset == 0 || 507 fpos_frag(offset) != fpos_frag(old_offset) || 508 fpos_off(offset) < fi->offset) { 509 dout("dir_llseek dropping %p content\n", file); 510 reset_readdir(fi); 511 } 512 513 /* bump dir_release_count if we did a forward seek */ 514 if (offset > old_offset) 515 fi->dir_release_count--; 516 } 517 out: 518 mutex_unlock(&inode->i_mutex); 519 return retval; 520 } 521 522 /* 523 * Handle lookups for the hidden .snap directory. 524 */ 525 int ceph_handle_snapdir(struct ceph_mds_request *req, 526 struct dentry *dentry, int err) 527 { 528 struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb); 529 struct inode *parent = dentry->d_parent->d_inode; /* we hold i_mutex */ 530 531 /* .snap dir? */ 532 if (err == -ENOENT && 533 ceph_snap(parent) == CEPH_NOSNAP && 534 strcmp(dentry->d_name.name, 535 fsc->mount_options->snapdir_name) == 0) { 536 struct inode *inode = ceph_get_snapdir(parent); 537 dout("ENOENT on snapdir %p '%.*s', linking to snapdir %p\n", 538 dentry, dentry->d_name.len, dentry->d_name.name, inode); 539 BUG_ON(!d_unhashed(dentry)); 540 d_add(dentry, inode); 541 err = 0; 542 } 543 return err; 544 } 545 546 /* 547 * Figure out final result of a lookup/open request. 548 * 549 * Mainly, make sure we return the final req->r_dentry (if it already 550 * existed) in place of the original VFS-provided dentry when they 551 * differ. 552 * 553 * Gracefully handle the case where the MDS replies with -ENOENT and 554 * no trace (which it may do, at its discretion, e.g., if it doesn't 555 * care to issue a lease on the negative dentry). 556 */ 557 struct dentry *ceph_finish_lookup(struct ceph_mds_request *req, 558 struct dentry *dentry, int err) 559 { 560 if (err == -ENOENT) { 561 /* no trace? */ 562 err = 0; 563 if (!req->r_reply_info.head->is_dentry) { 564 dout("ENOENT and no trace, dentry %p inode %p\n", 565 dentry, dentry->d_inode); 566 if (dentry->d_inode) { 567 d_drop(dentry); 568 err = -ENOENT; 569 } else { 570 d_add(dentry, NULL); 571 } 572 } 573 } 574 if (err) 575 dentry = ERR_PTR(err); 576 else if (dentry != req->r_dentry) 577 dentry = dget(req->r_dentry); /* we got spliced */ 578 else 579 dentry = NULL; 580 return dentry; 581 } 582 583 static int is_root_ceph_dentry(struct inode *inode, struct dentry *dentry) 584 { 585 return ceph_ino(inode) == CEPH_INO_ROOT && 586 strncmp(dentry->d_name.name, ".ceph", 5) == 0; 587 } 588 589 /* 590 * Look up a single dir entry. If there is a lookup intent, inform 591 * the MDS so that it gets our 'caps wanted' value in a single op. 592 */ 593 static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry, 594 unsigned int flags) 595 { 596 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); 597 struct ceph_mds_client *mdsc = fsc->mdsc; 598 struct ceph_mds_request *req; 599 int op; 600 int err; 601 602 dout("lookup %p dentry %p '%.*s'\n", 603 dir, dentry, dentry->d_name.len, dentry->d_name.name); 604 605 if (dentry->d_name.len > NAME_MAX) 606 return ERR_PTR(-ENAMETOOLONG); 607 608 err = ceph_init_dentry(dentry); 609 if (err < 0) 610 return ERR_PTR(err); 611 612 /* can we conclude ENOENT locally? */ 613 if (dentry->d_inode == NULL) { 614 struct ceph_inode_info *ci = ceph_inode(dir); 615 struct ceph_dentry_info *di = ceph_dentry(dentry); 616 617 spin_lock(&ci->i_ceph_lock); 618 dout(" dir %p flags are %d\n", dir, ci->i_ceph_flags); 619 if (strncmp(dentry->d_name.name, 620 fsc->mount_options->snapdir_name, 621 dentry->d_name.len) && 622 !is_root_ceph_dentry(dir, dentry) && 623 __ceph_dir_is_complete(ci) && 624 (__ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1))) { 625 spin_unlock(&ci->i_ceph_lock); 626 dout(" dir %p complete, -ENOENT\n", dir); 627 d_add(dentry, NULL); 628 di->lease_shared_gen = ci->i_shared_gen; 629 return NULL; 630 } 631 spin_unlock(&ci->i_ceph_lock); 632 } 633 634 op = ceph_snap(dir) == CEPH_SNAPDIR ? 635 CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP; 636 req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS); 637 if (IS_ERR(req)) 638 return ERR_CAST(req); 639 req->r_dentry = dget(dentry); 640 req->r_num_caps = 2; 641 /* we only need inode linkage */ 642 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE); 643 req->r_locked_dir = dir; 644 err = ceph_mdsc_do_request(mdsc, NULL, req); 645 err = ceph_handle_snapdir(req, dentry, err); 646 dentry = ceph_finish_lookup(req, dentry, err); 647 ceph_mdsc_put_request(req); /* will dput(dentry) */ 648 dout("lookup result=%p\n", dentry); 649 return dentry; 650 } 651 652 /* 653 * If we do a create but get no trace back from the MDS, follow up with 654 * a lookup (the VFS expects us to link up the provided dentry). 655 */ 656 int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry) 657 { 658 struct dentry *result = ceph_lookup(dir, dentry, 0); 659 660 if (result && !IS_ERR(result)) { 661 /* 662 * We created the item, then did a lookup, and found 663 * it was already linked to another inode we already 664 * had in our cache (and thus got spliced). Link our 665 * dentry to that inode, but don't hash it, just in 666 * case the VFS wants to dereference it. 667 */ 668 BUG_ON(!result->d_inode); 669 d_instantiate(dentry, result->d_inode); 670 return 0; 671 } 672 return PTR_ERR(result); 673 } 674 675 static int ceph_mknod(struct inode *dir, struct dentry *dentry, 676 umode_t mode, dev_t rdev) 677 { 678 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); 679 struct ceph_mds_client *mdsc = fsc->mdsc; 680 struct ceph_mds_request *req; 681 int err; 682 683 if (ceph_snap(dir) != CEPH_NOSNAP) 684 return -EROFS; 685 686 dout("mknod in dir %p dentry %p mode 0%ho rdev %d\n", 687 dir, dentry, mode, rdev); 688 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_MKNOD, USE_AUTH_MDS); 689 if (IS_ERR(req)) { 690 d_drop(dentry); 691 return PTR_ERR(req); 692 } 693 req->r_dentry = dget(dentry); 694 req->r_num_caps = 2; 695 req->r_locked_dir = dir; 696 req->r_args.mknod.mode = cpu_to_le32(mode); 697 req->r_args.mknod.rdev = cpu_to_le32(rdev); 698 req->r_dentry_drop = CEPH_CAP_FILE_SHARED; 699 req->r_dentry_unless = CEPH_CAP_FILE_EXCL; 700 err = ceph_mdsc_do_request(mdsc, dir, req); 701 if (!err && !req->r_reply_info.head->is_dentry) 702 err = ceph_handle_notrace_create(dir, dentry); 703 ceph_mdsc_put_request(req); 704 705 if (!err) 706 ceph_init_acl(dentry, dentry->d_inode, dir); 707 else 708 d_drop(dentry); 709 return err; 710 } 711 712 static int ceph_create(struct inode *dir, struct dentry *dentry, umode_t mode, 713 bool excl) 714 { 715 return ceph_mknod(dir, dentry, mode, 0); 716 } 717 718 static int ceph_symlink(struct inode *dir, struct dentry *dentry, 719 const char *dest) 720 { 721 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); 722 struct ceph_mds_client *mdsc = fsc->mdsc; 723 struct ceph_mds_request *req; 724 int err; 725 726 if (ceph_snap(dir) != CEPH_NOSNAP) 727 return -EROFS; 728 729 dout("symlink in dir %p dentry %p to '%s'\n", dir, dentry, dest); 730 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SYMLINK, USE_AUTH_MDS); 731 if (IS_ERR(req)) { 732 d_drop(dentry); 733 return PTR_ERR(req); 734 } 735 req->r_dentry = dget(dentry); 736 req->r_num_caps = 2; 737 req->r_path2 = kstrdup(dest, GFP_NOFS); 738 req->r_locked_dir = dir; 739 req->r_dentry_drop = CEPH_CAP_FILE_SHARED; 740 req->r_dentry_unless = CEPH_CAP_FILE_EXCL; 741 err = ceph_mdsc_do_request(mdsc, dir, req); 742 if (!err && !req->r_reply_info.head->is_dentry) 743 err = ceph_handle_notrace_create(dir, dentry); 744 ceph_mdsc_put_request(req); 745 if (!err) 746 ceph_init_acl(dentry, dentry->d_inode, dir); 747 else 748 d_drop(dentry); 749 return err; 750 } 751 752 static int ceph_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 753 { 754 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); 755 struct ceph_mds_client *mdsc = fsc->mdsc; 756 struct ceph_mds_request *req; 757 int err = -EROFS; 758 int op; 759 760 if (ceph_snap(dir) == CEPH_SNAPDIR) { 761 /* mkdir .snap/foo is a MKSNAP */ 762 op = CEPH_MDS_OP_MKSNAP; 763 dout("mksnap dir %p snap '%.*s' dn %p\n", dir, 764 dentry->d_name.len, dentry->d_name.name, dentry); 765 } else if (ceph_snap(dir) == CEPH_NOSNAP) { 766 dout("mkdir dir %p dn %p mode 0%ho\n", dir, dentry, mode); 767 op = CEPH_MDS_OP_MKDIR; 768 } else { 769 goto out; 770 } 771 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); 772 if (IS_ERR(req)) { 773 err = PTR_ERR(req); 774 goto out; 775 } 776 777 req->r_dentry = dget(dentry); 778 req->r_num_caps = 2; 779 req->r_locked_dir = dir; 780 req->r_args.mkdir.mode = cpu_to_le32(mode); 781 req->r_dentry_drop = CEPH_CAP_FILE_SHARED; 782 req->r_dentry_unless = CEPH_CAP_FILE_EXCL; 783 err = ceph_mdsc_do_request(mdsc, dir, req); 784 if (!err && !req->r_reply_info.head->is_dentry) 785 err = ceph_handle_notrace_create(dir, dentry); 786 ceph_mdsc_put_request(req); 787 out: 788 if (!err) 789 ceph_init_acl(dentry, dentry->d_inode, dir); 790 else 791 d_drop(dentry); 792 return err; 793 } 794 795 static int ceph_link(struct dentry *old_dentry, struct inode *dir, 796 struct dentry *dentry) 797 { 798 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); 799 struct ceph_mds_client *mdsc = fsc->mdsc; 800 struct ceph_mds_request *req; 801 int err; 802 803 if (ceph_snap(dir) != CEPH_NOSNAP) 804 return -EROFS; 805 806 dout("link in dir %p old_dentry %p dentry %p\n", dir, 807 old_dentry, dentry); 808 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LINK, USE_AUTH_MDS); 809 if (IS_ERR(req)) { 810 d_drop(dentry); 811 return PTR_ERR(req); 812 } 813 req->r_dentry = dget(dentry); 814 req->r_num_caps = 2; 815 req->r_old_dentry = dget(old_dentry); /* or inode? hrm. */ 816 req->r_old_dentry_dir = ceph_get_dentry_parent_inode(old_dentry); 817 req->r_locked_dir = dir; 818 req->r_dentry_drop = CEPH_CAP_FILE_SHARED; 819 req->r_dentry_unless = CEPH_CAP_FILE_EXCL; 820 /* release LINK_SHARED on source inode (mds will lock it) */ 821 req->r_old_inode_drop = CEPH_CAP_LINK_SHARED; 822 err = ceph_mdsc_do_request(mdsc, dir, req); 823 if (err) { 824 d_drop(dentry); 825 } else if (!req->r_reply_info.head->is_dentry) { 826 ihold(old_dentry->d_inode); 827 d_instantiate(dentry, old_dentry->d_inode); 828 } 829 ceph_mdsc_put_request(req); 830 return err; 831 } 832 833 /* 834 * For a soon-to-be unlinked file, drop the AUTH_RDCACHE caps. If it 835 * looks like the link count will hit 0, drop any other caps (other 836 * than PIN) we don't specifically want (due to the file still being 837 * open). 838 */ 839 static int drop_caps_for_unlink(struct inode *inode) 840 { 841 struct ceph_inode_info *ci = ceph_inode(inode); 842 int drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL; 843 844 spin_lock(&ci->i_ceph_lock); 845 if (inode->i_nlink == 1) { 846 drop |= ~(__ceph_caps_wanted(ci) | CEPH_CAP_PIN); 847 ci->i_ceph_flags |= CEPH_I_NODELAY; 848 } 849 spin_unlock(&ci->i_ceph_lock); 850 return drop; 851 } 852 853 /* 854 * rmdir and unlink are differ only by the metadata op code 855 */ 856 static int ceph_unlink(struct inode *dir, struct dentry *dentry) 857 { 858 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); 859 struct ceph_mds_client *mdsc = fsc->mdsc; 860 struct inode *inode = dentry->d_inode; 861 struct ceph_mds_request *req; 862 int err = -EROFS; 863 int op; 864 865 if (ceph_snap(dir) == CEPH_SNAPDIR) { 866 /* rmdir .snap/foo is RMSNAP */ 867 dout("rmsnap dir %p '%.*s' dn %p\n", dir, dentry->d_name.len, 868 dentry->d_name.name, dentry); 869 op = CEPH_MDS_OP_RMSNAP; 870 } else if (ceph_snap(dir) == CEPH_NOSNAP) { 871 dout("unlink/rmdir dir %p dn %p inode %p\n", 872 dir, dentry, inode); 873 op = S_ISDIR(dentry->d_inode->i_mode) ? 874 CEPH_MDS_OP_RMDIR : CEPH_MDS_OP_UNLINK; 875 } else 876 goto out; 877 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); 878 if (IS_ERR(req)) { 879 err = PTR_ERR(req); 880 goto out; 881 } 882 req->r_dentry = dget(dentry); 883 req->r_num_caps = 2; 884 req->r_locked_dir = dir; 885 req->r_dentry_drop = CEPH_CAP_FILE_SHARED; 886 req->r_dentry_unless = CEPH_CAP_FILE_EXCL; 887 req->r_inode_drop = drop_caps_for_unlink(inode); 888 err = ceph_mdsc_do_request(mdsc, dir, req); 889 if (!err && !req->r_reply_info.head->is_dentry) 890 d_delete(dentry); 891 ceph_mdsc_put_request(req); 892 out: 893 return err; 894 } 895 896 static int ceph_rename(struct inode *old_dir, struct dentry *old_dentry, 897 struct inode *new_dir, struct dentry *new_dentry) 898 { 899 struct ceph_fs_client *fsc = ceph_sb_to_client(old_dir->i_sb); 900 struct ceph_mds_client *mdsc = fsc->mdsc; 901 struct ceph_mds_request *req; 902 int err; 903 904 if (ceph_snap(old_dir) != ceph_snap(new_dir)) 905 return -EXDEV; 906 if (ceph_snap(old_dir) != CEPH_NOSNAP || 907 ceph_snap(new_dir) != CEPH_NOSNAP) 908 return -EROFS; 909 dout("rename dir %p dentry %p to dir %p dentry %p\n", 910 old_dir, old_dentry, new_dir, new_dentry); 911 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_RENAME, USE_AUTH_MDS); 912 if (IS_ERR(req)) 913 return PTR_ERR(req); 914 req->r_dentry = dget(new_dentry); 915 req->r_num_caps = 2; 916 req->r_old_dentry = dget(old_dentry); 917 req->r_old_dentry_dir = ceph_get_dentry_parent_inode(old_dentry); 918 req->r_locked_dir = new_dir; 919 req->r_old_dentry_drop = CEPH_CAP_FILE_SHARED; 920 req->r_old_dentry_unless = CEPH_CAP_FILE_EXCL; 921 req->r_dentry_drop = CEPH_CAP_FILE_SHARED; 922 req->r_dentry_unless = CEPH_CAP_FILE_EXCL; 923 /* release LINK_RDCACHE on source inode (mds will lock it) */ 924 req->r_old_inode_drop = CEPH_CAP_LINK_SHARED; 925 if (new_dentry->d_inode) 926 req->r_inode_drop = drop_caps_for_unlink(new_dentry->d_inode); 927 err = ceph_mdsc_do_request(mdsc, old_dir, req); 928 if (!err && !req->r_reply_info.head->is_dentry) { 929 /* 930 * Normally d_move() is done by fill_trace (called by 931 * do_request, above). If there is no trace, we need 932 * to do it here. 933 */ 934 935 /* d_move screws up d_subdirs order */ 936 ceph_dir_clear_complete(new_dir); 937 938 d_move(old_dentry, new_dentry); 939 940 /* ensure target dentry is invalidated, despite 941 rehashing bug in vfs_rename_dir */ 942 ceph_invalidate_dentry_lease(new_dentry); 943 } 944 ceph_mdsc_put_request(req); 945 return err; 946 } 947 948 /* 949 * Ensure a dentry lease will no longer revalidate. 950 */ 951 void ceph_invalidate_dentry_lease(struct dentry *dentry) 952 { 953 spin_lock(&dentry->d_lock); 954 dentry->d_time = jiffies; 955 ceph_dentry(dentry)->lease_shared_gen = 0; 956 spin_unlock(&dentry->d_lock); 957 } 958 959 /* 960 * Check if dentry lease is valid. If not, delete the lease. Try to 961 * renew if the least is more than half up. 962 */ 963 static int dentry_lease_is_valid(struct dentry *dentry) 964 { 965 struct ceph_dentry_info *di; 966 struct ceph_mds_session *s; 967 int valid = 0; 968 u32 gen; 969 unsigned long ttl; 970 struct ceph_mds_session *session = NULL; 971 struct inode *dir = NULL; 972 u32 seq = 0; 973 974 spin_lock(&dentry->d_lock); 975 di = ceph_dentry(dentry); 976 if (di->lease_session) { 977 s = di->lease_session; 978 spin_lock(&s->s_gen_ttl_lock); 979 gen = s->s_cap_gen; 980 ttl = s->s_cap_ttl; 981 spin_unlock(&s->s_gen_ttl_lock); 982 983 if (di->lease_gen == gen && 984 time_before(jiffies, dentry->d_time) && 985 time_before(jiffies, ttl)) { 986 valid = 1; 987 if (di->lease_renew_after && 988 time_after(jiffies, di->lease_renew_after)) { 989 /* we should renew */ 990 dir = dentry->d_parent->d_inode; 991 session = ceph_get_mds_session(s); 992 seq = di->lease_seq; 993 di->lease_renew_after = 0; 994 di->lease_renew_from = jiffies; 995 } 996 } 997 } 998 spin_unlock(&dentry->d_lock); 999 1000 if (session) { 1001 ceph_mdsc_lease_send_msg(session, dir, dentry, 1002 CEPH_MDS_LEASE_RENEW, seq); 1003 ceph_put_mds_session(session); 1004 } 1005 dout("dentry_lease_is_valid - dentry %p = %d\n", dentry, valid); 1006 return valid; 1007 } 1008 1009 /* 1010 * Check if directory-wide content lease/cap is valid. 1011 */ 1012 static int dir_lease_is_valid(struct inode *dir, struct dentry *dentry) 1013 { 1014 struct ceph_inode_info *ci = ceph_inode(dir); 1015 struct ceph_dentry_info *di = ceph_dentry(dentry); 1016 int valid = 0; 1017 1018 spin_lock(&ci->i_ceph_lock); 1019 if (ci->i_shared_gen == di->lease_shared_gen) 1020 valid = __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1); 1021 spin_unlock(&ci->i_ceph_lock); 1022 dout("dir_lease_is_valid dir %p v%u dentry %p v%u = %d\n", 1023 dir, (unsigned)ci->i_shared_gen, dentry, 1024 (unsigned)di->lease_shared_gen, valid); 1025 return valid; 1026 } 1027 1028 /* 1029 * Check if cached dentry can be trusted. 1030 */ 1031 static int ceph_d_revalidate(struct dentry *dentry, unsigned int flags) 1032 { 1033 int valid = 0; 1034 struct inode *dir; 1035 1036 if (flags & LOOKUP_RCU) 1037 return -ECHILD; 1038 1039 dout("d_revalidate %p '%.*s' inode %p offset %lld\n", dentry, 1040 dentry->d_name.len, dentry->d_name.name, dentry->d_inode, 1041 ceph_dentry(dentry)->offset); 1042 1043 dir = ceph_get_dentry_parent_inode(dentry); 1044 1045 /* always trust cached snapped dentries, snapdir dentry */ 1046 if (ceph_snap(dir) != CEPH_NOSNAP) { 1047 dout("d_revalidate %p '%.*s' inode %p is SNAPPED\n", dentry, 1048 dentry->d_name.len, dentry->d_name.name, dentry->d_inode); 1049 valid = 1; 1050 } else if (dentry->d_inode && 1051 ceph_snap(dentry->d_inode) == CEPH_SNAPDIR) { 1052 valid = 1; 1053 } else if (dentry_lease_is_valid(dentry) || 1054 dir_lease_is_valid(dir, dentry)) { 1055 if (dentry->d_inode) 1056 valid = ceph_is_any_caps(dentry->d_inode); 1057 else 1058 valid = 1; 1059 } 1060 1061 dout("d_revalidate %p %s\n", dentry, valid ? "valid" : "invalid"); 1062 if (valid) { 1063 ceph_dentry_lru_touch(dentry); 1064 } else { 1065 ceph_dir_clear_complete(dir); 1066 d_drop(dentry); 1067 } 1068 iput(dir); 1069 return valid; 1070 } 1071 1072 /* 1073 * Release our ceph_dentry_info. 1074 */ 1075 static void ceph_d_release(struct dentry *dentry) 1076 { 1077 struct ceph_dentry_info *di = ceph_dentry(dentry); 1078 1079 dout("d_release %p\n", dentry); 1080 ceph_dentry_lru_del(dentry); 1081 if (di->lease_session) 1082 ceph_put_mds_session(di->lease_session); 1083 kmem_cache_free(ceph_dentry_cachep, di); 1084 dentry->d_fsdata = NULL; 1085 } 1086 1087 static int ceph_snapdir_d_revalidate(struct dentry *dentry, 1088 unsigned int flags) 1089 { 1090 /* 1091 * Eventually, we'll want to revalidate snapped metadata 1092 * too... probably... 1093 */ 1094 return 1; 1095 } 1096 1097 /* 1098 * When the VFS prunes a dentry from the cache, we need to clear the 1099 * complete flag on the parent directory. 1100 * 1101 * Called under dentry->d_lock. 1102 */ 1103 static void ceph_d_prune(struct dentry *dentry) 1104 { 1105 dout("ceph_d_prune %p\n", dentry); 1106 1107 /* do we have a valid parent? */ 1108 if (IS_ROOT(dentry)) 1109 return; 1110 1111 /* if we are not hashed, we don't affect dir's completeness */ 1112 if (d_unhashed(dentry)) 1113 return; 1114 1115 /* 1116 * we hold d_lock, so d_parent is stable, and d_fsdata is never 1117 * cleared until d_release 1118 */ 1119 ceph_dir_clear_complete(dentry->d_parent->d_inode); 1120 } 1121 1122 /* 1123 * read() on a dir. This weird interface hack only works if mounted 1124 * with '-o dirstat'. 1125 */ 1126 static ssize_t ceph_read_dir(struct file *file, char __user *buf, size_t size, 1127 loff_t *ppos) 1128 { 1129 struct ceph_file_info *cf = file->private_data; 1130 struct inode *inode = file_inode(file); 1131 struct ceph_inode_info *ci = ceph_inode(inode); 1132 int left; 1133 const int bufsize = 1024; 1134 1135 if (!ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb), DIRSTAT)) 1136 return -EISDIR; 1137 1138 if (!cf->dir_info) { 1139 cf->dir_info = kmalloc(bufsize, GFP_NOFS); 1140 if (!cf->dir_info) 1141 return -ENOMEM; 1142 cf->dir_info_len = 1143 snprintf(cf->dir_info, bufsize, 1144 "entries: %20lld\n" 1145 " files: %20lld\n" 1146 " subdirs: %20lld\n" 1147 "rentries: %20lld\n" 1148 " rfiles: %20lld\n" 1149 " rsubdirs: %20lld\n" 1150 "rbytes: %20lld\n" 1151 "rctime: %10ld.%09ld\n", 1152 ci->i_files + ci->i_subdirs, 1153 ci->i_files, 1154 ci->i_subdirs, 1155 ci->i_rfiles + ci->i_rsubdirs, 1156 ci->i_rfiles, 1157 ci->i_rsubdirs, 1158 ci->i_rbytes, 1159 (long)ci->i_rctime.tv_sec, 1160 (long)ci->i_rctime.tv_nsec); 1161 } 1162 1163 if (*ppos >= cf->dir_info_len) 1164 return 0; 1165 size = min_t(unsigned, size, cf->dir_info_len-*ppos); 1166 left = copy_to_user(buf, cf->dir_info + *ppos, size); 1167 if (left == size) 1168 return -EFAULT; 1169 *ppos += (size - left); 1170 return size - left; 1171 } 1172 1173 /* 1174 * an fsync() on a dir will wait for any uncommitted directory 1175 * operations to commit. 1176 */ 1177 static int ceph_dir_fsync(struct file *file, loff_t start, loff_t end, 1178 int datasync) 1179 { 1180 struct inode *inode = file_inode(file); 1181 struct ceph_inode_info *ci = ceph_inode(inode); 1182 struct list_head *head = &ci->i_unsafe_dirops; 1183 struct ceph_mds_request *req; 1184 u64 last_tid; 1185 int ret = 0; 1186 1187 dout("dir_fsync %p\n", inode); 1188 ret = filemap_write_and_wait_range(inode->i_mapping, start, end); 1189 if (ret) 1190 return ret; 1191 mutex_lock(&inode->i_mutex); 1192 1193 spin_lock(&ci->i_unsafe_lock); 1194 if (list_empty(head)) 1195 goto out; 1196 1197 req = list_entry(head->prev, 1198 struct ceph_mds_request, r_unsafe_dir_item); 1199 last_tid = req->r_tid; 1200 1201 do { 1202 ceph_mdsc_get_request(req); 1203 spin_unlock(&ci->i_unsafe_lock); 1204 1205 dout("dir_fsync %p wait on tid %llu (until %llu)\n", 1206 inode, req->r_tid, last_tid); 1207 if (req->r_timeout) { 1208 ret = wait_for_completion_timeout( 1209 &req->r_safe_completion, req->r_timeout); 1210 if (ret > 0) 1211 ret = 0; 1212 else if (ret == 0) 1213 ret = -EIO; /* timed out */ 1214 } else { 1215 wait_for_completion(&req->r_safe_completion); 1216 } 1217 ceph_mdsc_put_request(req); 1218 1219 spin_lock(&ci->i_unsafe_lock); 1220 if (ret || list_empty(head)) 1221 break; 1222 req = list_entry(head->next, 1223 struct ceph_mds_request, r_unsafe_dir_item); 1224 } while (req->r_tid < last_tid); 1225 out: 1226 spin_unlock(&ci->i_unsafe_lock); 1227 mutex_unlock(&inode->i_mutex); 1228 1229 return ret; 1230 } 1231 1232 /* 1233 * We maintain a private dentry LRU. 1234 * 1235 * FIXME: this needs to be changed to a per-mds lru to be useful. 1236 */ 1237 void ceph_dentry_lru_add(struct dentry *dn) 1238 { 1239 struct ceph_dentry_info *di = ceph_dentry(dn); 1240 struct ceph_mds_client *mdsc; 1241 1242 dout("dentry_lru_add %p %p '%.*s'\n", di, dn, 1243 dn->d_name.len, dn->d_name.name); 1244 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc; 1245 spin_lock(&mdsc->dentry_lru_lock); 1246 list_add_tail(&di->lru, &mdsc->dentry_lru); 1247 mdsc->num_dentry++; 1248 spin_unlock(&mdsc->dentry_lru_lock); 1249 } 1250 1251 void ceph_dentry_lru_touch(struct dentry *dn) 1252 { 1253 struct ceph_dentry_info *di = ceph_dentry(dn); 1254 struct ceph_mds_client *mdsc; 1255 1256 dout("dentry_lru_touch %p %p '%.*s' (offset %lld)\n", di, dn, 1257 dn->d_name.len, dn->d_name.name, di->offset); 1258 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc; 1259 spin_lock(&mdsc->dentry_lru_lock); 1260 list_move_tail(&di->lru, &mdsc->dentry_lru); 1261 spin_unlock(&mdsc->dentry_lru_lock); 1262 } 1263 1264 void ceph_dentry_lru_del(struct dentry *dn) 1265 { 1266 struct ceph_dentry_info *di = ceph_dentry(dn); 1267 struct ceph_mds_client *mdsc; 1268 1269 dout("dentry_lru_del %p %p '%.*s'\n", di, dn, 1270 dn->d_name.len, dn->d_name.name); 1271 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc; 1272 spin_lock(&mdsc->dentry_lru_lock); 1273 list_del_init(&di->lru); 1274 mdsc->num_dentry--; 1275 spin_unlock(&mdsc->dentry_lru_lock); 1276 } 1277 1278 /* 1279 * Return name hash for a given dentry. This is dependent on 1280 * the parent directory's hash function. 1281 */ 1282 unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn) 1283 { 1284 struct ceph_inode_info *dci = ceph_inode(dir); 1285 1286 switch (dci->i_dir_layout.dl_dir_hash) { 1287 case 0: /* for backward compat */ 1288 case CEPH_STR_HASH_LINUX: 1289 return dn->d_name.hash; 1290 1291 default: 1292 return ceph_str_hash(dci->i_dir_layout.dl_dir_hash, 1293 dn->d_name.name, dn->d_name.len); 1294 } 1295 } 1296 1297 const struct file_operations ceph_dir_fops = { 1298 .read = ceph_read_dir, 1299 .iterate = ceph_readdir, 1300 .llseek = ceph_dir_llseek, 1301 .open = ceph_open, 1302 .release = ceph_release, 1303 .unlocked_ioctl = ceph_ioctl, 1304 .fsync = ceph_dir_fsync, 1305 }; 1306 1307 const struct inode_operations ceph_dir_iops = { 1308 .lookup = ceph_lookup, 1309 .permission = ceph_permission, 1310 .getattr = ceph_getattr, 1311 .setattr = ceph_setattr, 1312 .setxattr = ceph_setxattr, 1313 .getxattr = ceph_getxattr, 1314 .listxattr = ceph_listxattr, 1315 .removexattr = ceph_removexattr, 1316 .get_acl = ceph_get_acl, 1317 .set_acl = ceph_set_acl, 1318 .mknod = ceph_mknod, 1319 .symlink = ceph_symlink, 1320 .mkdir = ceph_mkdir, 1321 .link = ceph_link, 1322 .unlink = ceph_unlink, 1323 .rmdir = ceph_unlink, 1324 .rename = ceph_rename, 1325 .create = ceph_create, 1326 .atomic_open = ceph_atomic_open, 1327 }; 1328 1329 const struct dentry_operations ceph_dentry_ops = { 1330 .d_revalidate = ceph_d_revalidate, 1331 .d_release = ceph_d_release, 1332 .d_prune = ceph_d_prune, 1333 }; 1334 1335 const struct dentry_operations ceph_snapdir_dentry_ops = { 1336 .d_revalidate = ceph_snapdir_d_revalidate, 1337 .d_release = ceph_d_release, 1338 }; 1339 1340 const struct dentry_operations ceph_snap_dentry_ops = { 1341 .d_release = ceph_d_release, 1342 .d_prune = ceph_d_prune, 1343 }; 1344