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 dentry_operations ceph_dentry_ops; 30 31 /* 32 * Initialize ceph dentry state. 33 */ 34 int ceph_init_dentry(struct dentry *dentry) 35 { 36 struct ceph_dentry_info *di; 37 38 if (dentry->d_fsdata) 39 return 0; 40 41 di = kmem_cache_alloc(ceph_dentry_cachep, GFP_NOFS | __GFP_ZERO); 42 if (!di) 43 return -ENOMEM; /* oh well */ 44 45 spin_lock(&dentry->d_lock); 46 if (dentry->d_fsdata) { 47 /* lost a race */ 48 kmem_cache_free(ceph_dentry_cachep, di); 49 goto out_unlock; 50 } 51 52 if (ceph_snap(dentry->d_parent->d_inode) == CEPH_NOSNAP) 53 d_set_d_op(dentry, &ceph_dentry_ops); 54 else if (ceph_snap(dentry->d_parent->d_inode) == CEPH_SNAPDIR) 55 d_set_d_op(dentry, &ceph_snapdir_dentry_ops); 56 else 57 d_set_d_op(dentry, &ceph_snap_dentry_ops); 58 59 di->dentry = dentry; 60 di->lease_session = NULL; 61 dentry->d_time = jiffies; 62 /* avoid reordering d_fsdata setup so that the check above is safe */ 63 smp_mb(); 64 dentry->d_fsdata = di; 65 ceph_dentry_lru_add(dentry); 66 out_unlock: 67 spin_unlock(&dentry->d_lock); 68 return 0; 69 } 70 71 struct inode *ceph_get_dentry_parent_inode(struct dentry *dentry) 72 { 73 struct inode *inode = NULL; 74 75 if (!dentry) 76 return NULL; 77 78 spin_lock(&dentry->d_lock); 79 if (!IS_ROOT(dentry)) { 80 inode = dentry->d_parent->d_inode; 81 ihold(inode); 82 } 83 spin_unlock(&dentry->d_lock); 84 return inode; 85 } 86 87 88 /* 89 * for readdir, we encode the directory frag and offset within that 90 * frag into f_pos. 91 */ 92 static unsigned fpos_frag(loff_t p) 93 { 94 return p >> 32; 95 } 96 static unsigned fpos_off(loff_t p) 97 { 98 return p & 0xffffffff; 99 } 100 101 static int fpos_cmp(loff_t l, loff_t r) 102 { 103 int v = ceph_frag_compare(fpos_frag(l), fpos_frag(r)); 104 if (v) 105 return v; 106 return (int)(fpos_off(l) - fpos_off(r)); 107 } 108 109 /* 110 * When possible, we try to satisfy a readdir by peeking at the 111 * dcache. We make this work by carefully ordering dentries on 112 * d_child when we initially get results back from the MDS, and 113 * falling back to a "normal" sync readdir if any dentries in the dir 114 * are dropped. 115 * 116 * Complete dir indicates that we have all dentries in the dir. It is 117 * defined IFF we hold CEPH_CAP_FILE_SHARED (which will be revoked by 118 * the MDS if/when the directory is modified). 119 */ 120 static int __dcache_readdir(struct file *file, struct dir_context *ctx, 121 u32 shared_gen) 122 { 123 struct ceph_file_info *fi = file->private_data; 124 struct dentry *parent = file->f_path.dentry; 125 struct inode *dir = parent->d_inode; 126 struct list_head *p; 127 struct dentry *dentry, *last; 128 struct ceph_dentry_info *di; 129 int err = 0; 130 131 /* claim ref on last dentry we returned */ 132 last = fi->dentry; 133 fi->dentry = NULL; 134 135 dout("__dcache_readdir %p v%u at %llu (last %p)\n", 136 dir, shared_gen, ctx->pos, last); 137 138 spin_lock(&parent->d_lock); 139 140 /* start at beginning? */ 141 if (ctx->pos == 2 || last == NULL || 142 fpos_cmp(ctx->pos, ceph_dentry(last)->offset) < 0) { 143 if (list_empty(&parent->d_subdirs)) 144 goto out_unlock; 145 p = parent->d_subdirs.prev; 146 dout(" initial p %p/%p\n", p->prev, p->next); 147 } else { 148 p = last->d_child.prev; 149 } 150 151 more: 152 dentry = list_entry(p, struct dentry, d_child); 153 di = ceph_dentry(dentry); 154 while (1) { 155 dout(" p %p/%p %s d_subdirs %p/%p\n", p->prev, p->next, 156 d_unhashed(dentry) ? "!hashed" : "hashed", 157 parent->d_subdirs.prev, parent->d_subdirs.next); 158 if (p == &parent->d_subdirs) { 159 fi->flags |= CEPH_F_ATEND; 160 goto out_unlock; 161 } 162 spin_lock_nested(&dentry->d_lock, DENTRY_D_LOCK_NESTED); 163 if (di->lease_shared_gen == shared_gen && 164 !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 %pd at %llu (%llu)%s%s\n", dentry, 170 dentry, 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_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 /* make sure a dentry wasn't dropped while we didn't have parent lock */ 184 if (!ceph_dir_is_complete_ordered(dir)) { 185 dout(" lost dir complete on %p; falling back to mds\n", dir); 186 dput(dentry); 187 err = -EAGAIN; 188 goto out; 189 } 190 191 dout(" %llu (%llu) dentry %p %pd %p\n", di->offset, ctx->pos, 192 dentry, dentry, dentry->d_inode); 193 if (!dir_emit(ctx, dentry->d_name.name, 194 dentry->d_name.len, 195 ceph_translate_ino(dentry->d_sb, dentry->d_inode->i_ino), 196 dentry->d_inode->i_mode >> 12)) { 197 if (last) { 198 /* remember our position */ 199 fi->dentry = last; 200 fi->next_offset = fpos_off(di->offset); 201 } 202 dput(dentry); 203 return 0; 204 } 205 206 ctx->pos = di->offset + 1; 207 208 if (last) 209 dput(last); 210 last = dentry; 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; 255 256 dout("readdir %p file %p frag %u off %u\n", inode, file, frag, off); 257 if (fi->flags & CEPH_F_ATEND) 258 return 0; 259 260 /* always start with . and .. */ 261 if (ctx->pos == 0) { 262 dout("readdir off 0 -> '.'\n"); 263 if (!dir_emit(ctx, ".", 1, 264 ceph_translate_ino(inode->i_sb, inode->i_ino), 265 inode->i_mode >> 12)) 266 return 0; 267 ctx->pos = 1; 268 off = 1; 269 } 270 if (ctx->pos == 1) { 271 ino_t ino = parent_ino(file->f_path.dentry); 272 dout("readdir off 1 -> '..'\n"); 273 if (!dir_emit(ctx, "..", 2, 274 ceph_translate_ino(inode->i_sb, ino), 275 inode->i_mode >> 12)) 276 return 0; 277 ctx->pos = 2; 278 off = 2; 279 } 280 281 /* can we use the dcache? */ 282 spin_lock(&ci->i_ceph_lock); 283 if ((ctx->pos == 2 || fi->dentry) && 284 !ceph_test_mount_opt(fsc, NOASYNCREADDIR) && 285 ceph_snap(inode) != CEPH_SNAPDIR && 286 __ceph_dir_is_complete_ordered(ci) && 287 __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1)) { 288 u32 shared_gen = ci->i_shared_gen; 289 spin_unlock(&ci->i_ceph_lock); 290 err = __dcache_readdir(file, ctx, shared_gen); 291 if (err != -EAGAIN) 292 return err; 293 frag = fpos_frag(ctx->pos); 294 off = fpos_off(ctx->pos); 295 } else { 296 spin_unlock(&ci->i_ceph_lock); 297 } 298 if (fi->dentry) { 299 err = note_last_dentry(fi, fi->dentry->d_name.name, 300 fi->dentry->d_name.len); 301 if (err) 302 return err; 303 dput(fi->dentry); 304 fi->dentry = NULL; 305 } 306 307 /* proceed with a normal readdir */ 308 309 if (ctx->pos == 2) { 310 /* note dir version at start of readdir so we can tell 311 * if any dentries get dropped */ 312 fi->dir_release_count = atomic_read(&ci->i_release_count); 313 fi->dir_ordered_count = ci->i_ordered_count; 314 } 315 316 more: 317 /* do we have the correct frag content buffered? */ 318 if (fi->frag != frag || fi->last_readdir == NULL) { 319 struct ceph_mds_request *req; 320 int op = ceph_snap(inode) == CEPH_SNAPDIR ? 321 CEPH_MDS_OP_LSSNAP : CEPH_MDS_OP_READDIR; 322 323 /* discard old result, if any */ 324 if (fi->last_readdir) { 325 ceph_mdsc_put_request(fi->last_readdir); 326 fi->last_readdir = NULL; 327 } 328 329 dout("readdir fetching %llx.%llx frag %x offset '%s'\n", 330 ceph_vinop(inode), frag, fi->last_name); 331 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); 332 if (IS_ERR(req)) 333 return PTR_ERR(req); 334 err = ceph_alloc_readdir_reply_buffer(req, inode); 335 if (err) { 336 ceph_mdsc_put_request(req); 337 return err; 338 } 339 req->r_inode = inode; 340 ihold(inode); 341 req->r_dentry = dget(file->f_path.dentry); 342 /* hints to request -> mds selection code */ 343 req->r_direct_mode = USE_AUTH_MDS; 344 req->r_direct_hash = ceph_frag_value(frag); 345 req->r_direct_is_hash = true; 346 req->r_path2 = kstrdup(fi->last_name, GFP_NOFS); 347 req->r_readdir_offset = fi->next_offset; 348 req->r_args.readdir.frag = cpu_to_le32(frag); 349 err = ceph_mdsc_do_request(mdsc, NULL, req); 350 if (err < 0) { 351 ceph_mdsc_put_request(req); 352 return err; 353 } 354 dout("readdir got and parsed readdir result=%d" 355 " on frag %x, end=%d, complete=%d\n", err, frag, 356 (int)req->r_reply_info.dir_end, 357 (int)req->r_reply_info.dir_complete); 358 359 if (!req->r_did_prepopulate) { 360 dout("readdir !did_prepopulate"); 361 /* preclude from marking dir complete */ 362 fi->dir_release_count--; 363 } 364 365 /* note next offset and last dentry name */ 366 rinfo = &req->r_reply_info; 367 if (le32_to_cpu(rinfo->dir_dir->frag) != frag) { 368 frag = le32_to_cpu(rinfo->dir_dir->frag); 369 if (ceph_frag_is_leftmost(frag)) 370 fi->next_offset = 2; 371 else 372 fi->next_offset = 0; 373 off = fi->next_offset; 374 } 375 fi->frag = frag; 376 fi->offset = fi->next_offset; 377 fi->last_readdir = req; 378 379 if (req->r_reply_info.dir_end) { 380 kfree(fi->last_name); 381 fi->last_name = NULL; 382 if (ceph_frag_is_rightmost(frag)) 383 fi->next_offset = 2; 384 else 385 fi->next_offset = 0; 386 } else { 387 err = note_last_dentry(fi, 388 rinfo->dir_dname[rinfo->dir_nr-1], 389 rinfo->dir_dname_len[rinfo->dir_nr-1]); 390 if (err) 391 return err; 392 fi->next_offset += rinfo->dir_nr; 393 } 394 } 395 396 rinfo = &fi->last_readdir->r_reply_info; 397 dout("readdir frag %x num %d off %d chunkoff %d\n", frag, 398 rinfo->dir_nr, off, fi->offset); 399 400 ctx->pos = ceph_make_fpos(frag, off); 401 while (off >= fi->offset && off - fi->offset < rinfo->dir_nr) { 402 struct ceph_mds_reply_inode *in = 403 rinfo->dir_in[off - fi->offset].in; 404 struct ceph_vino vino; 405 ino_t ino; 406 407 dout("readdir off %d (%d/%d) -> %lld '%.*s' %p\n", 408 off, off - fi->offset, rinfo->dir_nr, ctx->pos, 409 rinfo->dir_dname_len[off - fi->offset], 410 rinfo->dir_dname[off - fi->offset], in); 411 BUG_ON(!in); 412 ftype = le32_to_cpu(in->mode) >> 12; 413 vino.ino = le64_to_cpu(in->ino); 414 vino.snap = le64_to_cpu(in->snapid); 415 ino = ceph_vino_to_ino(vino); 416 if (!dir_emit(ctx, 417 rinfo->dir_dname[off - fi->offset], 418 rinfo->dir_dname_len[off - fi->offset], 419 ceph_translate_ino(inode->i_sb, ino), ftype)) { 420 dout("filldir stopping us...\n"); 421 return 0; 422 } 423 off++; 424 ctx->pos++; 425 } 426 427 if (fi->last_name) { 428 ceph_mdsc_put_request(fi->last_readdir); 429 fi->last_readdir = NULL; 430 goto more; 431 } 432 433 /* more frags? */ 434 if (!ceph_frag_is_rightmost(frag)) { 435 frag = ceph_frag_next(frag); 436 off = 0; 437 ctx->pos = ceph_make_fpos(frag, off); 438 dout("readdir next frag is %x\n", frag); 439 goto more; 440 } 441 fi->flags |= CEPH_F_ATEND; 442 443 /* 444 * if dir_release_count still matches the dir, no dentries 445 * were released during the whole readdir, and we should have 446 * the complete dir contents in our cache. 447 */ 448 spin_lock(&ci->i_ceph_lock); 449 if (atomic_read(&ci->i_release_count) == fi->dir_release_count) { 450 if (ci->i_ordered_count == fi->dir_ordered_count) 451 dout(" marking %p complete and ordered\n", inode); 452 else 453 dout(" marking %p complete\n", inode); 454 __ceph_dir_set_complete(ci, fi->dir_release_count, 455 fi->dir_ordered_count); 456 } 457 spin_unlock(&ci->i_ceph_lock); 458 459 dout("readdir %p file %p done.\n", inode, file); 460 return 0; 461 } 462 463 static void reset_readdir(struct ceph_file_info *fi, unsigned frag) 464 { 465 if (fi->last_readdir) { 466 ceph_mdsc_put_request(fi->last_readdir); 467 fi->last_readdir = NULL; 468 } 469 kfree(fi->last_name); 470 fi->last_name = NULL; 471 if (ceph_frag_is_leftmost(frag)) 472 fi->next_offset = 2; /* compensate for . and .. */ 473 else 474 fi->next_offset = 0; 475 if (fi->dentry) { 476 dput(fi->dentry); 477 fi->dentry = NULL; 478 } 479 fi->flags &= ~CEPH_F_ATEND; 480 } 481 482 static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int whence) 483 { 484 struct ceph_file_info *fi = file->private_data; 485 struct inode *inode = file->f_mapping->host; 486 loff_t old_offset = ceph_make_fpos(fi->frag, fi->next_offset); 487 loff_t retval; 488 489 mutex_lock(&inode->i_mutex); 490 retval = -EINVAL; 491 switch (whence) { 492 case SEEK_END: 493 offset += inode->i_size + 2; /* FIXME */ 494 break; 495 case SEEK_CUR: 496 offset += file->f_pos; 497 case SEEK_SET: 498 break; 499 default: 500 goto out; 501 } 502 503 if (offset >= 0) { 504 if (offset != file->f_pos) { 505 file->f_pos = offset; 506 file->f_version = 0; 507 fi->flags &= ~CEPH_F_ATEND; 508 } 509 retval = offset; 510 511 /* 512 * discard buffered readdir content on seekdir(0), or 513 * seek to new frag, or seek prior to current chunk. 514 */ 515 if (offset == 0 || 516 fpos_frag(offset) != fi->frag || 517 fpos_off(offset) < fi->offset) { 518 dout("dir_llseek dropping %p content\n", file); 519 reset_readdir(fi, fpos_frag(offset)); 520 } 521 522 /* bump dir_release_count if we did a forward seek */ 523 if (fpos_cmp(offset, old_offset) > 0) 524 fi->dir_release_count--; 525 } 526 out: 527 mutex_unlock(&inode->i_mutex); 528 return retval; 529 } 530 531 /* 532 * Handle lookups for the hidden .snap directory. 533 */ 534 int ceph_handle_snapdir(struct ceph_mds_request *req, 535 struct dentry *dentry, int err) 536 { 537 struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb); 538 struct inode *parent = dentry->d_parent->d_inode; /* we hold i_mutex */ 539 540 /* .snap dir? */ 541 if (err == -ENOENT && 542 ceph_snap(parent) == CEPH_NOSNAP && 543 strcmp(dentry->d_name.name, 544 fsc->mount_options->snapdir_name) == 0) { 545 struct inode *inode = ceph_get_snapdir(parent); 546 dout("ENOENT on snapdir %p '%pd', linking to snapdir %p\n", 547 dentry, dentry, inode); 548 BUG_ON(!d_unhashed(dentry)); 549 d_add(dentry, inode); 550 err = 0; 551 } 552 return err; 553 } 554 555 /* 556 * Figure out final result of a lookup/open request. 557 * 558 * Mainly, make sure we return the final req->r_dentry (if it already 559 * existed) in place of the original VFS-provided dentry when they 560 * differ. 561 * 562 * Gracefully handle the case where the MDS replies with -ENOENT and 563 * no trace (which it may do, at its discretion, e.g., if it doesn't 564 * care to issue a lease on the negative dentry). 565 */ 566 struct dentry *ceph_finish_lookup(struct ceph_mds_request *req, 567 struct dentry *dentry, int err) 568 { 569 if (err == -ENOENT) { 570 /* no trace? */ 571 err = 0; 572 if (!req->r_reply_info.head->is_dentry) { 573 dout("ENOENT and no trace, dentry %p inode %p\n", 574 dentry, dentry->d_inode); 575 if (dentry->d_inode) { 576 d_drop(dentry); 577 err = -ENOENT; 578 } else { 579 d_add(dentry, NULL); 580 } 581 } 582 } 583 if (err) 584 dentry = ERR_PTR(err); 585 else if (dentry != req->r_dentry) 586 dentry = dget(req->r_dentry); /* we got spliced */ 587 else 588 dentry = NULL; 589 return dentry; 590 } 591 592 static int is_root_ceph_dentry(struct inode *inode, struct dentry *dentry) 593 { 594 return ceph_ino(inode) == CEPH_INO_ROOT && 595 strncmp(dentry->d_name.name, ".ceph", 5) == 0; 596 } 597 598 /* 599 * Look up a single dir entry. If there is a lookup intent, inform 600 * the MDS so that it gets our 'caps wanted' value in a single op. 601 */ 602 static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry, 603 unsigned int flags) 604 { 605 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); 606 struct ceph_mds_client *mdsc = fsc->mdsc; 607 struct ceph_mds_request *req; 608 int op; 609 int err; 610 611 dout("lookup %p dentry %p '%pd'\n", 612 dir, dentry, dentry); 613 614 if (dentry->d_name.len > NAME_MAX) 615 return ERR_PTR(-ENAMETOOLONG); 616 617 err = ceph_init_dentry(dentry); 618 if (err < 0) 619 return ERR_PTR(err); 620 621 /* can we conclude ENOENT locally? */ 622 if (dentry->d_inode == NULL) { 623 struct ceph_inode_info *ci = ceph_inode(dir); 624 struct ceph_dentry_info *di = ceph_dentry(dentry); 625 626 spin_lock(&ci->i_ceph_lock); 627 dout(" dir %p flags are %d\n", dir, ci->i_ceph_flags); 628 if (strncmp(dentry->d_name.name, 629 fsc->mount_options->snapdir_name, 630 dentry->d_name.len) && 631 !is_root_ceph_dentry(dir, dentry) && 632 __ceph_dir_is_complete(ci) && 633 (__ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1))) { 634 spin_unlock(&ci->i_ceph_lock); 635 dout(" dir %p complete, -ENOENT\n", dir); 636 d_add(dentry, NULL); 637 di->lease_shared_gen = ci->i_shared_gen; 638 return NULL; 639 } 640 spin_unlock(&ci->i_ceph_lock); 641 } 642 643 op = ceph_snap(dir) == CEPH_SNAPDIR ? 644 CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP; 645 req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS); 646 if (IS_ERR(req)) 647 return ERR_CAST(req); 648 req->r_dentry = dget(dentry); 649 req->r_num_caps = 2; 650 /* we only need inode linkage */ 651 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE); 652 req->r_locked_dir = dir; 653 err = ceph_mdsc_do_request(mdsc, NULL, req); 654 err = ceph_handle_snapdir(req, dentry, err); 655 dentry = ceph_finish_lookup(req, dentry, err); 656 ceph_mdsc_put_request(req); /* will dput(dentry) */ 657 dout("lookup result=%p\n", dentry); 658 return dentry; 659 } 660 661 /* 662 * If we do a create but get no trace back from the MDS, follow up with 663 * a lookup (the VFS expects us to link up the provided dentry). 664 */ 665 int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry) 666 { 667 struct dentry *result = ceph_lookup(dir, dentry, 0); 668 669 if (result && !IS_ERR(result)) { 670 /* 671 * We created the item, then did a lookup, and found 672 * it was already linked to another inode we already 673 * had in our cache (and thus got spliced). To not 674 * confuse VFS (especially when inode is a directory), 675 * we don't link our dentry to that inode, return an 676 * error instead. 677 * 678 * This event should be rare and it happens only when 679 * we talk to old MDS. Recent MDS does not send traceless 680 * reply for request that creates new inode. 681 */ 682 d_drop(result); 683 return -ESTALE; 684 } 685 return PTR_ERR(result); 686 } 687 688 static int ceph_mknod(struct inode *dir, struct dentry *dentry, 689 umode_t mode, dev_t rdev) 690 { 691 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); 692 struct ceph_mds_client *mdsc = fsc->mdsc; 693 struct ceph_mds_request *req; 694 struct ceph_acls_info acls = {}; 695 int err; 696 697 if (ceph_snap(dir) != CEPH_NOSNAP) 698 return -EROFS; 699 700 err = ceph_pre_init_acls(dir, &mode, &acls); 701 if (err < 0) 702 return err; 703 704 dout("mknod in dir %p dentry %p mode 0%ho rdev %d\n", 705 dir, dentry, mode, rdev); 706 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_MKNOD, USE_AUTH_MDS); 707 if (IS_ERR(req)) { 708 err = PTR_ERR(req); 709 goto out; 710 } 711 req->r_dentry = dget(dentry); 712 req->r_num_caps = 2; 713 req->r_locked_dir = dir; 714 req->r_args.mknod.mode = cpu_to_le32(mode); 715 req->r_args.mknod.rdev = cpu_to_le32(rdev); 716 req->r_dentry_drop = CEPH_CAP_FILE_SHARED; 717 req->r_dentry_unless = CEPH_CAP_FILE_EXCL; 718 if (acls.pagelist) { 719 req->r_pagelist = acls.pagelist; 720 acls.pagelist = NULL; 721 } 722 err = ceph_mdsc_do_request(mdsc, dir, req); 723 if (!err && !req->r_reply_info.head->is_dentry) 724 err = ceph_handle_notrace_create(dir, dentry); 725 ceph_mdsc_put_request(req); 726 out: 727 if (!err) 728 ceph_init_inode_acls(dentry->d_inode, &acls); 729 else 730 d_drop(dentry); 731 ceph_release_acls_info(&acls); 732 return err; 733 } 734 735 static int ceph_create(struct inode *dir, struct dentry *dentry, umode_t mode, 736 bool excl) 737 { 738 return ceph_mknod(dir, dentry, mode, 0); 739 } 740 741 static int ceph_symlink(struct inode *dir, struct dentry *dentry, 742 const char *dest) 743 { 744 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); 745 struct ceph_mds_client *mdsc = fsc->mdsc; 746 struct ceph_mds_request *req; 747 int err; 748 749 if (ceph_snap(dir) != CEPH_NOSNAP) 750 return -EROFS; 751 752 dout("symlink in dir %p dentry %p to '%s'\n", dir, dentry, dest); 753 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SYMLINK, USE_AUTH_MDS); 754 if (IS_ERR(req)) { 755 err = PTR_ERR(req); 756 goto out; 757 } 758 req->r_dentry = dget(dentry); 759 req->r_num_caps = 2; 760 req->r_path2 = kstrdup(dest, GFP_NOFS); 761 req->r_locked_dir = dir; 762 req->r_dentry_drop = CEPH_CAP_FILE_SHARED; 763 req->r_dentry_unless = CEPH_CAP_FILE_EXCL; 764 err = ceph_mdsc_do_request(mdsc, dir, req); 765 if (!err && !req->r_reply_info.head->is_dentry) 766 err = ceph_handle_notrace_create(dir, dentry); 767 ceph_mdsc_put_request(req); 768 out: 769 if (err) 770 d_drop(dentry); 771 return err; 772 } 773 774 static int ceph_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 775 { 776 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); 777 struct ceph_mds_client *mdsc = fsc->mdsc; 778 struct ceph_mds_request *req; 779 struct ceph_acls_info acls = {}; 780 int err = -EROFS; 781 int op; 782 783 if (ceph_snap(dir) == CEPH_SNAPDIR) { 784 /* mkdir .snap/foo is a MKSNAP */ 785 op = CEPH_MDS_OP_MKSNAP; 786 dout("mksnap dir %p snap '%pd' dn %p\n", dir, 787 dentry, dentry); 788 } else if (ceph_snap(dir) == CEPH_NOSNAP) { 789 dout("mkdir dir %p dn %p mode 0%ho\n", dir, dentry, mode); 790 op = CEPH_MDS_OP_MKDIR; 791 } else { 792 goto out; 793 } 794 795 mode |= S_IFDIR; 796 err = ceph_pre_init_acls(dir, &mode, &acls); 797 if (err < 0) 798 goto out; 799 800 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); 801 if (IS_ERR(req)) { 802 err = PTR_ERR(req); 803 goto out; 804 } 805 806 req->r_dentry = dget(dentry); 807 req->r_num_caps = 2; 808 req->r_locked_dir = dir; 809 req->r_args.mkdir.mode = cpu_to_le32(mode); 810 req->r_dentry_drop = CEPH_CAP_FILE_SHARED; 811 req->r_dentry_unless = CEPH_CAP_FILE_EXCL; 812 if (acls.pagelist) { 813 req->r_pagelist = acls.pagelist; 814 acls.pagelist = NULL; 815 } 816 err = ceph_mdsc_do_request(mdsc, dir, req); 817 if (!err && 818 !req->r_reply_info.head->is_target && 819 !req->r_reply_info.head->is_dentry) 820 err = ceph_handle_notrace_create(dir, dentry); 821 ceph_mdsc_put_request(req); 822 out: 823 if (!err) 824 ceph_init_inode_acls(dentry->d_inode, &acls); 825 else 826 d_drop(dentry); 827 ceph_release_acls_info(&acls); 828 return err; 829 } 830 831 static int ceph_link(struct dentry *old_dentry, struct inode *dir, 832 struct dentry *dentry) 833 { 834 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); 835 struct ceph_mds_client *mdsc = fsc->mdsc; 836 struct ceph_mds_request *req; 837 int err; 838 839 if (ceph_snap(dir) != CEPH_NOSNAP) 840 return -EROFS; 841 842 dout("link in dir %p old_dentry %p dentry %p\n", dir, 843 old_dentry, dentry); 844 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LINK, USE_AUTH_MDS); 845 if (IS_ERR(req)) { 846 d_drop(dentry); 847 return PTR_ERR(req); 848 } 849 req->r_dentry = dget(dentry); 850 req->r_num_caps = 2; 851 req->r_old_dentry = dget(old_dentry); 852 req->r_locked_dir = dir; 853 req->r_dentry_drop = CEPH_CAP_FILE_SHARED; 854 req->r_dentry_unless = CEPH_CAP_FILE_EXCL; 855 /* release LINK_SHARED on source inode (mds will lock it) */ 856 req->r_old_inode_drop = CEPH_CAP_LINK_SHARED; 857 err = ceph_mdsc_do_request(mdsc, dir, req); 858 if (err) { 859 d_drop(dentry); 860 } else if (!req->r_reply_info.head->is_dentry) { 861 ihold(old_dentry->d_inode); 862 d_instantiate(dentry, old_dentry->d_inode); 863 } 864 ceph_mdsc_put_request(req); 865 return err; 866 } 867 868 /* 869 * For a soon-to-be unlinked file, drop the AUTH_RDCACHE caps. If it 870 * looks like the link count will hit 0, drop any other caps (other 871 * than PIN) we don't specifically want (due to the file still being 872 * open). 873 */ 874 static int drop_caps_for_unlink(struct inode *inode) 875 { 876 struct ceph_inode_info *ci = ceph_inode(inode); 877 int drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL; 878 879 spin_lock(&ci->i_ceph_lock); 880 if (inode->i_nlink == 1) { 881 drop |= ~(__ceph_caps_wanted(ci) | CEPH_CAP_PIN); 882 ci->i_ceph_flags |= CEPH_I_NODELAY; 883 } 884 spin_unlock(&ci->i_ceph_lock); 885 return drop; 886 } 887 888 /* 889 * rmdir and unlink are differ only by the metadata op code 890 */ 891 static int ceph_unlink(struct inode *dir, struct dentry *dentry) 892 { 893 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); 894 struct ceph_mds_client *mdsc = fsc->mdsc; 895 struct inode *inode = dentry->d_inode; 896 struct ceph_mds_request *req; 897 int err = -EROFS; 898 int op; 899 900 if (ceph_snap(dir) == CEPH_SNAPDIR) { 901 /* rmdir .snap/foo is RMSNAP */ 902 dout("rmsnap dir %p '%pd' dn %p\n", dir, dentry, dentry); 903 op = CEPH_MDS_OP_RMSNAP; 904 } else if (ceph_snap(dir) == CEPH_NOSNAP) { 905 dout("unlink/rmdir dir %p dn %p inode %p\n", 906 dir, dentry, inode); 907 op = d_is_dir(dentry) ? 908 CEPH_MDS_OP_RMDIR : CEPH_MDS_OP_UNLINK; 909 } else 910 goto out; 911 req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); 912 if (IS_ERR(req)) { 913 err = PTR_ERR(req); 914 goto out; 915 } 916 req->r_dentry = dget(dentry); 917 req->r_num_caps = 2; 918 req->r_locked_dir = dir; 919 req->r_dentry_drop = CEPH_CAP_FILE_SHARED; 920 req->r_dentry_unless = CEPH_CAP_FILE_EXCL; 921 req->r_inode_drop = drop_caps_for_unlink(inode); 922 err = ceph_mdsc_do_request(mdsc, dir, req); 923 if (!err && !req->r_reply_info.head->is_dentry) 924 d_delete(dentry); 925 ceph_mdsc_put_request(req); 926 out: 927 return err; 928 } 929 930 static int ceph_rename(struct inode *old_dir, struct dentry *old_dentry, 931 struct inode *new_dir, struct dentry *new_dentry) 932 { 933 struct ceph_fs_client *fsc = ceph_sb_to_client(old_dir->i_sb); 934 struct ceph_mds_client *mdsc = fsc->mdsc; 935 struct ceph_mds_request *req; 936 int err; 937 938 if (ceph_snap(old_dir) != ceph_snap(new_dir)) 939 return -EXDEV; 940 if (ceph_snap(old_dir) != CEPH_NOSNAP || 941 ceph_snap(new_dir) != CEPH_NOSNAP) 942 return -EROFS; 943 dout("rename dir %p dentry %p to dir %p dentry %p\n", 944 old_dir, old_dentry, new_dir, new_dentry); 945 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_RENAME, USE_AUTH_MDS); 946 if (IS_ERR(req)) 947 return PTR_ERR(req); 948 ihold(old_dir); 949 req->r_dentry = dget(new_dentry); 950 req->r_num_caps = 2; 951 req->r_old_dentry = dget(old_dentry); 952 req->r_old_dentry_dir = old_dir; 953 req->r_locked_dir = new_dir; 954 req->r_old_dentry_drop = CEPH_CAP_FILE_SHARED; 955 req->r_old_dentry_unless = CEPH_CAP_FILE_EXCL; 956 req->r_dentry_drop = CEPH_CAP_FILE_SHARED; 957 req->r_dentry_unless = CEPH_CAP_FILE_EXCL; 958 /* release LINK_RDCACHE on source inode (mds will lock it) */ 959 req->r_old_inode_drop = CEPH_CAP_LINK_SHARED; 960 if (new_dentry->d_inode) 961 req->r_inode_drop = drop_caps_for_unlink(new_dentry->d_inode); 962 err = ceph_mdsc_do_request(mdsc, old_dir, req); 963 if (!err && !req->r_reply_info.head->is_dentry) { 964 /* 965 * Normally d_move() is done by fill_trace (called by 966 * do_request, above). If there is no trace, we need 967 * to do it here. 968 */ 969 970 d_move(old_dentry, new_dentry); 971 972 /* ensure target dentry is invalidated, despite 973 rehashing bug in vfs_rename_dir */ 974 ceph_invalidate_dentry_lease(new_dentry); 975 976 /* d_move screws up sibling dentries' offsets */ 977 ceph_dir_clear_complete(old_dir); 978 ceph_dir_clear_complete(new_dir); 979 980 } 981 ceph_mdsc_put_request(req); 982 return err; 983 } 984 985 /* 986 * Ensure a dentry lease will no longer revalidate. 987 */ 988 void ceph_invalidate_dentry_lease(struct dentry *dentry) 989 { 990 spin_lock(&dentry->d_lock); 991 dentry->d_time = jiffies; 992 ceph_dentry(dentry)->lease_shared_gen = 0; 993 spin_unlock(&dentry->d_lock); 994 } 995 996 /* 997 * Check if dentry lease is valid. If not, delete the lease. Try to 998 * renew if the least is more than half up. 999 */ 1000 static int dentry_lease_is_valid(struct dentry *dentry) 1001 { 1002 struct ceph_dentry_info *di; 1003 struct ceph_mds_session *s; 1004 int valid = 0; 1005 u32 gen; 1006 unsigned long ttl; 1007 struct ceph_mds_session *session = NULL; 1008 struct inode *dir = NULL; 1009 u32 seq = 0; 1010 1011 spin_lock(&dentry->d_lock); 1012 di = ceph_dentry(dentry); 1013 if (di->lease_session) { 1014 s = di->lease_session; 1015 spin_lock(&s->s_gen_ttl_lock); 1016 gen = s->s_cap_gen; 1017 ttl = s->s_cap_ttl; 1018 spin_unlock(&s->s_gen_ttl_lock); 1019 1020 if (di->lease_gen == gen && 1021 time_before(jiffies, dentry->d_time) && 1022 time_before(jiffies, ttl)) { 1023 valid = 1; 1024 if (di->lease_renew_after && 1025 time_after(jiffies, di->lease_renew_after)) { 1026 /* we should renew */ 1027 dir = dentry->d_parent->d_inode; 1028 session = ceph_get_mds_session(s); 1029 seq = di->lease_seq; 1030 di->lease_renew_after = 0; 1031 di->lease_renew_from = jiffies; 1032 } 1033 } 1034 } 1035 spin_unlock(&dentry->d_lock); 1036 1037 if (session) { 1038 ceph_mdsc_lease_send_msg(session, dir, dentry, 1039 CEPH_MDS_LEASE_RENEW, seq); 1040 ceph_put_mds_session(session); 1041 } 1042 dout("dentry_lease_is_valid - dentry %p = %d\n", dentry, valid); 1043 return valid; 1044 } 1045 1046 /* 1047 * Check if directory-wide content lease/cap is valid. 1048 */ 1049 static int dir_lease_is_valid(struct inode *dir, struct dentry *dentry) 1050 { 1051 struct ceph_inode_info *ci = ceph_inode(dir); 1052 struct ceph_dentry_info *di = ceph_dentry(dentry); 1053 int valid = 0; 1054 1055 spin_lock(&ci->i_ceph_lock); 1056 if (ci->i_shared_gen == di->lease_shared_gen) 1057 valid = __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1); 1058 spin_unlock(&ci->i_ceph_lock); 1059 dout("dir_lease_is_valid dir %p v%u dentry %p v%u = %d\n", 1060 dir, (unsigned)ci->i_shared_gen, dentry, 1061 (unsigned)di->lease_shared_gen, valid); 1062 return valid; 1063 } 1064 1065 /* 1066 * Check if cached dentry can be trusted. 1067 */ 1068 static int ceph_d_revalidate(struct dentry *dentry, unsigned int flags) 1069 { 1070 int valid = 0; 1071 struct inode *dir; 1072 1073 if (flags & LOOKUP_RCU) 1074 return -ECHILD; 1075 1076 dout("d_revalidate %p '%pd' inode %p offset %lld\n", dentry, 1077 dentry, dentry->d_inode, ceph_dentry(dentry)->offset); 1078 1079 dir = ceph_get_dentry_parent_inode(dentry); 1080 1081 /* always trust cached snapped dentries, snapdir dentry */ 1082 if (ceph_snap(dir) != CEPH_NOSNAP) { 1083 dout("d_revalidate %p '%pd' inode %p is SNAPPED\n", dentry, 1084 dentry, dentry->d_inode); 1085 valid = 1; 1086 } else if (dentry->d_inode && 1087 ceph_snap(dentry->d_inode) == CEPH_SNAPDIR) { 1088 valid = 1; 1089 } else if (dentry_lease_is_valid(dentry) || 1090 dir_lease_is_valid(dir, dentry)) { 1091 if (dentry->d_inode) 1092 valid = ceph_is_any_caps(dentry->d_inode); 1093 else 1094 valid = 1; 1095 } 1096 1097 dout("d_revalidate %p %s\n", dentry, valid ? "valid" : "invalid"); 1098 if (valid) { 1099 ceph_dentry_lru_touch(dentry); 1100 } else { 1101 ceph_dir_clear_complete(dir); 1102 } 1103 iput(dir); 1104 return valid; 1105 } 1106 1107 /* 1108 * Release our ceph_dentry_info. 1109 */ 1110 static void ceph_d_release(struct dentry *dentry) 1111 { 1112 struct ceph_dentry_info *di = ceph_dentry(dentry); 1113 1114 dout("d_release %p\n", dentry); 1115 ceph_dentry_lru_del(dentry); 1116 if (di->lease_session) 1117 ceph_put_mds_session(di->lease_session); 1118 kmem_cache_free(ceph_dentry_cachep, di); 1119 dentry->d_fsdata = NULL; 1120 } 1121 1122 static int ceph_snapdir_d_revalidate(struct dentry *dentry, 1123 unsigned int flags) 1124 { 1125 /* 1126 * Eventually, we'll want to revalidate snapped metadata 1127 * too... probably... 1128 */ 1129 return 1; 1130 } 1131 1132 /* 1133 * When the VFS prunes a dentry from the cache, we need to clear the 1134 * complete flag on the parent directory. 1135 * 1136 * Called under dentry->d_lock. 1137 */ 1138 static void ceph_d_prune(struct dentry *dentry) 1139 { 1140 dout("ceph_d_prune %p\n", dentry); 1141 1142 /* do we have a valid parent? */ 1143 if (IS_ROOT(dentry)) 1144 return; 1145 1146 /* if we are not hashed, we don't affect dir's completeness */ 1147 if (d_unhashed(dentry)) 1148 return; 1149 1150 /* 1151 * we hold d_lock, so d_parent is stable, and d_fsdata is never 1152 * cleared until d_release 1153 */ 1154 ceph_dir_clear_complete(dentry->d_parent->d_inode); 1155 } 1156 1157 /* 1158 * read() on a dir. This weird interface hack only works if mounted 1159 * with '-o dirstat'. 1160 */ 1161 static ssize_t ceph_read_dir(struct file *file, char __user *buf, size_t size, 1162 loff_t *ppos) 1163 { 1164 struct ceph_file_info *cf = file->private_data; 1165 struct inode *inode = file_inode(file); 1166 struct ceph_inode_info *ci = ceph_inode(inode); 1167 int left; 1168 const int bufsize = 1024; 1169 1170 if (!ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb), DIRSTAT)) 1171 return -EISDIR; 1172 1173 if (!cf->dir_info) { 1174 cf->dir_info = kmalloc(bufsize, GFP_NOFS); 1175 if (!cf->dir_info) 1176 return -ENOMEM; 1177 cf->dir_info_len = 1178 snprintf(cf->dir_info, bufsize, 1179 "entries: %20lld\n" 1180 " files: %20lld\n" 1181 " subdirs: %20lld\n" 1182 "rentries: %20lld\n" 1183 " rfiles: %20lld\n" 1184 " rsubdirs: %20lld\n" 1185 "rbytes: %20lld\n" 1186 "rctime: %10ld.%09ld\n", 1187 ci->i_files + ci->i_subdirs, 1188 ci->i_files, 1189 ci->i_subdirs, 1190 ci->i_rfiles + ci->i_rsubdirs, 1191 ci->i_rfiles, 1192 ci->i_rsubdirs, 1193 ci->i_rbytes, 1194 (long)ci->i_rctime.tv_sec, 1195 (long)ci->i_rctime.tv_nsec); 1196 } 1197 1198 if (*ppos >= cf->dir_info_len) 1199 return 0; 1200 size = min_t(unsigned, size, cf->dir_info_len-*ppos); 1201 left = copy_to_user(buf, cf->dir_info + *ppos, size); 1202 if (left == size) 1203 return -EFAULT; 1204 *ppos += (size - left); 1205 return size - left; 1206 } 1207 1208 /* 1209 * an fsync() on a dir will wait for any uncommitted directory 1210 * operations to commit. 1211 */ 1212 static int ceph_dir_fsync(struct file *file, loff_t start, loff_t end, 1213 int datasync) 1214 { 1215 struct inode *inode = file_inode(file); 1216 struct ceph_inode_info *ci = ceph_inode(inode); 1217 struct list_head *head = &ci->i_unsafe_dirops; 1218 struct ceph_mds_request *req; 1219 u64 last_tid; 1220 int ret = 0; 1221 1222 dout("dir_fsync %p\n", inode); 1223 ret = filemap_write_and_wait_range(inode->i_mapping, start, end); 1224 if (ret) 1225 return ret; 1226 mutex_lock(&inode->i_mutex); 1227 1228 spin_lock(&ci->i_unsafe_lock); 1229 if (list_empty(head)) 1230 goto out; 1231 1232 req = list_entry(head->prev, 1233 struct ceph_mds_request, r_unsafe_dir_item); 1234 last_tid = req->r_tid; 1235 1236 do { 1237 ceph_mdsc_get_request(req); 1238 spin_unlock(&ci->i_unsafe_lock); 1239 1240 dout("dir_fsync %p wait on tid %llu (until %llu)\n", 1241 inode, req->r_tid, last_tid); 1242 if (req->r_timeout) { 1243 ret = wait_for_completion_timeout( 1244 &req->r_safe_completion, req->r_timeout); 1245 if (ret > 0) 1246 ret = 0; 1247 else if (ret == 0) 1248 ret = -EIO; /* timed out */ 1249 } else { 1250 wait_for_completion(&req->r_safe_completion); 1251 } 1252 ceph_mdsc_put_request(req); 1253 1254 spin_lock(&ci->i_unsafe_lock); 1255 if (ret || list_empty(head)) 1256 break; 1257 req = list_entry(head->next, 1258 struct ceph_mds_request, r_unsafe_dir_item); 1259 } while (req->r_tid < last_tid); 1260 out: 1261 spin_unlock(&ci->i_unsafe_lock); 1262 mutex_unlock(&inode->i_mutex); 1263 1264 return ret; 1265 } 1266 1267 /* 1268 * We maintain a private dentry LRU. 1269 * 1270 * FIXME: this needs to be changed to a per-mds lru to be useful. 1271 */ 1272 void ceph_dentry_lru_add(struct dentry *dn) 1273 { 1274 struct ceph_dentry_info *di = ceph_dentry(dn); 1275 struct ceph_mds_client *mdsc; 1276 1277 dout("dentry_lru_add %p %p '%pd'\n", di, dn, dn); 1278 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc; 1279 spin_lock(&mdsc->dentry_lru_lock); 1280 list_add_tail(&di->lru, &mdsc->dentry_lru); 1281 mdsc->num_dentry++; 1282 spin_unlock(&mdsc->dentry_lru_lock); 1283 } 1284 1285 void ceph_dentry_lru_touch(struct dentry *dn) 1286 { 1287 struct ceph_dentry_info *di = ceph_dentry(dn); 1288 struct ceph_mds_client *mdsc; 1289 1290 dout("dentry_lru_touch %p %p '%pd' (offset %lld)\n", di, dn, dn, 1291 di->offset); 1292 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc; 1293 spin_lock(&mdsc->dentry_lru_lock); 1294 list_move_tail(&di->lru, &mdsc->dentry_lru); 1295 spin_unlock(&mdsc->dentry_lru_lock); 1296 } 1297 1298 void ceph_dentry_lru_del(struct dentry *dn) 1299 { 1300 struct ceph_dentry_info *di = ceph_dentry(dn); 1301 struct ceph_mds_client *mdsc; 1302 1303 dout("dentry_lru_del %p %p '%pd'\n", di, dn, dn); 1304 mdsc = ceph_sb_to_client(dn->d_sb)->mdsc; 1305 spin_lock(&mdsc->dentry_lru_lock); 1306 list_del_init(&di->lru); 1307 mdsc->num_dentry--; 1308 spin_unlock(&mdsc->dentry_lru_lock); 1309 } 1310 1311 /* 1312 * Return name hash for a given dentry. This is dependent on 1313 * the parent directory's hash function. 1314 */ 1315 unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn) 1316 { 1317 struct ceph_inode_info *dci = ceph_inode(dir); 1318 1319 switch (dci->i_dir_layout.dl_dir_hash) { 1320 case 0: /* for backward compat */ 1321 case CEPH_STR_HASH_LINUX: 1322 return dn->d_name.hash; 1323 1324 default: 1325 return ceph_str_hash(dci->i_dir_layout.dl_dir_hash, 1326 dn->d_name.name, dn->d_name.len); 1327 } 1328 } 1329 1330 const struct file_operations ceph_dir_fops = { 1331 .read = ceph_read_dir, 1332 .iterate = ceph_readdir, 1333 .llseek = ceph_dir_llseek, 1334 .open = ceph_open, 1335 .release = ceph_release, 1336 .unlocked_ioctl = ceph_ioctl, 1337 .fsync = ceph_dir_fsync, 1338 }; 1339 1340 const struct file_operations ceph_snapdir_fops = { 1341 .iterate = ceph_readdir, 1342 .llseek = ceph_dir_llseek, 1343 .open = ceph_open, 1344 .release = ceph_release, 1345 }; 1346 1347 const struct inode_operations ceph_dir_iops = { 1348 .lookup = ceph_lookup, 1349 .permission = ceph_permission, 1350 .getattr = ceph_getattr, 1351 .setattr = ceph_setattr, 1352 .setxattr = ceph_setxattr, 1353 .getxattr = ceph_getxattr, 1354 .listxattr = ceph_listxattr, 1355 .removexattr = ceph_removexattr, 1356 .get_acl = ceph_get_acl, 1357 .set_acl = ceph_set_acl, 1358 .mknod = ceph_mknod, 1359 .symlink = ceph_symlink, 1360 .mkdir = ceph_mkdir, 1361 .link = ceph_link, 1362 .unlink = ceph_unlink, 1363 .rmdir = ceph_unlink, 1364 .rename = ceph_rename, 1365 .create = ceph_create, 1366 .atomic_open = ceph_atomic_open, 1367 }; 1368 1369 const struct inode_operations ceph_snapdir_iops = { 1370 .lookup = ceph_lookup, 1371 .permission = ceph_permission, 1372 .getattr = ceph_getattr, 1373 .mkdir = ceph_mkdir, 1374 .rmdir = ceph_unlink, 1375 }; 1376 1377 const struct dentry_operations ceph_dentry_ops = { 1378 .d_revalidate = ceph_d_revalidate, 1379 .d_release = ceph_d_release, 1380 .d_prune = ceph_d_prune, 1381 }; 1382 1383 const struct dentry_operations ceph_snapdir_dentry_ops = { 1384 .d_revalidate = ceph_snapdir_d_revalidate, 1385 .d_release = ceph_d_release, 1386 }; 1387 1388 const struct dentry_operations ceph_snap_dentry_ops = { 1389 .d_release = ceph_d_release, 1390 .d_prune = ceph_d_prune, 1391 }; 1392