1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/ceph/ceph_debug.h> 3 4 #include <linux/backing-dev.h> 5 #include <linux/fs.h> 6 #include <linux/mm.h> 7 #include <linux/pagemap.h> 8 #include <linux/writeback.h> /* generic_writepages */ 9 #include <linux/slab.h> 10 #include <linux/pagevec.h> 11 #include <linux/task_io_accounting_ops.h> 12 #include <linux/signal.h> 13 #include <linux/iversion.h> 14 #include <linux/ktime.h> 15 16 #include "super.h" 17 #include "mds_client.h" 18 #include "cache.h" 19 #include "metric.h" 20 #include <linux/ceph/osd_client.h> 21 #include <linux/ceph/striper.h> 22 23 /* 24 * Ceph address space ops. 25 * 26 * There are a few funny things going on here. 27 * 28 * The page->private field is used to reference a struct 29 * ceph_snap_context for _every_ dirty page. This indicates which 30 * snapshot the page was logically dirtied in, and thus which snap 31 * context needs to be associated with the osd write during writeback. 32 * 33 * Similarly, struct ceph_inode_info maintains a set of counters to 34 * count dirty pages on the inode. In the absence of snapshots, 35 * i_wrbuffer_ref == i_wrbuffer_ref_head == the dirty page count. 36 * 37 * When a snapshot is taken (that is, when the client receives 38 * notification that a snapshot was taken), each inode with caps and 39 * with dirty pages (dirty pages implies there is a cap) gets a new 40 * ceph_cap_snap in the i_cap_snaps list (which is sorted in ascending 41 * order, new snaps go to the tail). The i_wrbuffer_ref_head count is 42 * moved to capsnap->dirty. (Unless a sync write is currently in 43 * progress. In that case, the capsnap is said to be "pending", new 44 * writes cannot start, and the capsnap isn't "finalized" until the 45 * write completes (or fails) and a final size/mtime for the inode for 46 * that snap can be settled upon.) i_wrbuffer_ref_head is reset to 0. 47 * 48 * On writeback, we must submit writes to the osd IN SNAP ORDER. So, 49 * we look for the first capsnap in i_cap_snaps and write out pages in 50 * that snap context _only_. Then we move on to the next capsnap, 51 * eventually reaching the "live" or "head" context (i.e., pages that 52 * are not yet snapped) and are writing the most recently dirtied 53 * pages. 54 * 55 * Invalidate and so forth must take care to ensure the dirty page 56 * accounting is preserved. 57 */ 58 59 #define CONGESTION_ON_THRESH(congestion_kb) (congestion_kb >> (PAGE_SHIFT-10)) 60 #define CONGESTION_OFF_THRESH(congestion_kb) \ 61 (CONGESTION_ON_THRESH(congestion_kb) - \ 62 (CONGESTION_ON_THRESH(congestion_kb) >> 2)) 63 64 static inline struct ceph_snap_context *page_snap_context(struct page *page) 65 { 66 if (PagePrivate(page)) 67 return (void *)page->private; 68 return NULL; 69 } 70 71 /* 72 * Dirty a page. Optimistically adjust accounting, on the assumption 73 * that we won't race with invalidate. If we do, readjust. 74 */ 75 static int ceph_set_page_dirty(struct page *page) 76 { 77 struct address_space *mapping = page->mapping; 78 struct inode *inode; 79 struct ceph_inode_info *ci; 80 struct ceph_snap_context *snapc; 81 int ret; 82 83 if (unlikely(!mapping)) 84 return !TestSetPageDirty(page); 85 86 if (PageDirty(page)) { 87 dout("%p set_page_dirty %p idx %lu -- already dirty\n", 88 mapping->host, page, page->index); 89 BUG_ON(!PagePrivate(page)); 90 return 0; 91 } 92 93 inode = mapping->host; 94 ci = ceph_inode(inode); 95 96 /* dirty the head */ 97 spin_lock(&ci->i_ceph_lock); 98 BUG_ON(ci->i_wr_ref == 0); // caller should hold Fw reference 99 if (__ceph_have_pending_cap_snap(ci)) { 100 struct ceph_cap_snap *capsnap = 101 list_last_entry(&ci->i_cap_snaps, 102 struct ceph_cap_snap, 103 ci_item); 104 snapc = ceph_get_snap_context(capsnap->context); 105 capsnap->dirty_pages++; 106 } else { 107 BUG_ON(!ci->i_head_snapc); 108 snapc = ceph_get_snap_context(ci->i_head_snapc); 109 ++ci->i_wrbuffer_ref_head; 110 } 111 if (ci->i_wrbuffer_ref == 0) 112 ihold(inode); 113 ++ci->i_wrbuffer_ref; 114 dout("%p set_page_dirty %p idx %lu head %d/%d -> %d/%d " 115 "snapc %p seq %lld (%d snaps)\n", 116 mapping->host, page, page->index, 117 ci->i_wrbuffer_ref-1, ci->i_wrbuffer_ref_head-1, 118 ci->i_wrbuffer_ref, ci->i_wrbuffer_ref_head, 119 snapc, snapc->seq, snapc->num_snaps); 120 spin_unlock(&ci->i_ceph_lock); 121 122 /* 123 * Reference snap context in page->private. Also set 124 * PagePrivate so that we get invalidatepage callback. 125 */ 126 BUG_ON(PagePrivate(page)); 127 page->private = (unsigned long)snapc; 128 SetPagePrivate(page); 129 130 ret = __set_page_dirty_nobuffers(page); 131 WARN_ON(!PageLocked(page)); 132 WARN_ON(!page->mapping); 133 134 return ret; 135 } 136 137 /* 138 * If we are truncating the full page (i.e. offset == 0), adjust the 139 * dirty page counters appropriately. Only called if there is private 140 * data on the page. 141 */ 142 static void ceph_invalidatepage(struct page *page, unsigned int offset, 143 unsigned int length) 144 { 145 struct inode *inode; 146 struct ceph_inode_info *ci; 147 struct ceph_snap_context *snapc = page_snap_context(page); 148 149 inode = page->mapping->host; 150 ci = ceph_inode(inode); 151 152 if (offset != 0 || length != PAGE_SIZE) { 153 dout("%p invalidatepage %p idx %lu partial dirty page %u~%u\n", 154 inode, page, page->index, offset, length); 155 return; 156 } 157 158 ceph_invalidate_fscache_page(inode, page); 159 160 WARN_ON(!PageLocked(page)); 161 if (!PagePrivate(page)) 162 return; 163 164 dout("%p invalidatepage %p idx %lu full dirty page\n", 165 inode, page, page->index); 166 167 ceph_put_wrbuffer_cap_refs(ci, 1, snapc); 168 ceph_put_snap_context(snapc); 169 page->private = 0; 170 ClearPagePrivate(page); 171 } 172 173 static int ceph_releasepage(struct page *page, gfp_t g) 174 { 175 dout("%p releasepage %p idx %lu (%sdirty)\n", page->mapping->host, 176 page, page->index, PageDirty(page) ? "" : "not "); 177 178 /* Can we release the page from the cache? */ 179 if (!ceph_release_fscache_page(page, g)) 180 return 0; 181 182 return !PagePrivate(page); 183 } 184 185 /* read a single page, without unlocking it. */ 186 static int ceph_do_readpage(struct file *filp, struct page *page) 187 { 188 struct inode *inode = file_inode(filp); 189 struct ceph_inode_info *ci = ceph_inode(inode); 190 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 191 struct ceph_osd_client *osdc = &fsc->client->osdc; 192 struct ceph_osd_request *req; 193 struct ceph_vino vino = ceph_vino(inode); 194 int err = 0; 195 u64 off = page_offset(page); 196 u64 len = PAGE_SIZE; 197 198 if (off >= i_size_read(inode)) { 199 zero_user_segment(page, 0, PAGE_SIZE); 200 SetPageUptodate(page); 201 return 0; 202 } 203 204 if (ci->i_inline_version != CEPH_INLINE_NONE) { 205 /* 206 * Uptodate inline data should have been added 207 * into page cache while getting Fcr caps. 208 */ 209 if (off == 0) 210 return -EINVAL; 211 zero_user_segment(page, 0, PAGE_SIZE); 212 SetPageUptodate(page); 213 return 0; 214 } 215 216 err = ceph_readpage_from_fscache(inode, page); 217 if (err == 0) 218 return -EINPROGRESS; 219 220 dout("readpage ino %llx.%llx file %p off %llu len %llu page %p index %lu\n", 221 vino.ino, vino.snap, filp, off, len, page, page->index); 222 req = ceph_osdc_new_request(osdc, &ci->i_layout, vino, off, &len, 0, 1, 223 CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ, NULL, 224 ci->i_truncate_seq, ci->i_truncate_size, 225 false); 226 if (IS_ERR(req)) 227 return PTR_ERR(req); 228 229 osd_req_op_extent_osd_data_pages(req, 0, &page, len, 0, false, false); 230 231 err = ceph_osdc_start_request(osdc, req, false); 232 if (!err) 233 err = ceph_osdc_wait_request(osdc, req); 234 235 ceph_update_read_latency(&fsc->mdsc->metric, req->r_start_latency, 236 req->r_end_latency, err); 237 238 ceph_osdc_put_request(req); 239 dout("readpage result %d\n", err); 240 241 if (err == -ENOENT) 242 err = 0; 243 if (err < 0) { 244 ceph_fscache_readpage_cancel(inode, page); 245 if (err == -EBLOCKLISTED) 246 fsc->blocklisted = true; 247 goto out; 248 } 249 if (err < PAGE_SIZE) 250 /* zero fill remainder of page */ 251 zero_user_segment(page, err, PAGE_SIZE); 252 else 253 flush_dcache_page(page); 254 255 SetPageUptodate(page); 256 ceph_readpage_to_fscache(inode, page); 257 258 out: 259 return err < 0 ? err : 0; 260 } 261 262 static int ceph_readpage(struct file *filp, struct page *page) 263 { 264 int r = ceph_do_readpage(filp, page); 265 if (r != -EINPROGRESS) 266 unlock_page(page); 267 else 268 r = 0; 269 return r; 270 } 271 272 /* 273 * Finish an async read(ahead) op. 274 */ 275 static void finish_read(struct ceph_osd_request *req) 276 { 277 struct inode *inode = req->r_inode; 278 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 279 struct ceph_osd_data *osd_data; 280 int rc = req->r_result <= 0 ? req->r_result : 0; 281 int bytes = req->r_result >= 0 ? req->r_result : 0; 282 int num_pages; 283 int i; 284 285 dout("finish_read %p req %p rc %d bytes %d\n", inode, req, rc, bytes); 286 if (rc == -EBLOCKLISTED) 287 ceph_inode_to_client(inode)->blocklisted = true; 288 289 /* unlock all pages, zeroing any data we didn't read */ 290 osd_data = osd_req_op_extent_osd_data(req, 0); 291 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES); 292 num_pages = calc_pages_for((u64)osd_data->alignment, 293 (u64)osd_data->length); 294 for (i = 0; i < num_pages; i++) { 295 struct page *page = osd_data->pages[i]; 296 297 if (rc < 0 && rc != -ENOENT) { 298 ceph_fscache_readpage_cancel(inode, page); 299 goto unlock; 300 } 301 if (bytes < (int)PAGE_SIZE) { 302 /* zero (remainder of) page */ 303 int s = bytes < 0 ? 0 : bytes; 304 zero_user_segment(page, s, PAGE_SIZE); 305 } 306 dout("finish_read %p uptodate %p idx %lu\n", inode, page, 307 page->index); 308 flush_dcache_page(page); 309 SetPageUptodate(page); 310 ceph_readpage_to_fscache(inode, page); 311 unlock: 312 unlock_page(page); 313 put_page(page); 314 bytes -= PAGE_SIZE; 315 } 316 317 ceph_update_read_latency(&fsc->mdsc->metric, req->r_start_latency, 318 req->r_end_latency, rc); 319 320 kfree(osd_data->pages); 321 } 322 323 /* 324 * start an async read(ahead) operation. return nr_pages we submitted 325 * a read for on success, or negative error code. 326 */ 327 static int start_read(struct inode *inode, struct ceph_rw_context *rw_ctx, 328 struct list_head *page_list, int max) 329 { 330 struct ceph_osd_client *osdc = 331 &ceph_inode_to_client(inode)->client->osdc; 332 struct ceph_inode_info *ci = ceph_inode(inode); 333 struct page *page = lru_to_page(page_list); 334 struct ceph_vino vino; 335 struct ceph_osd_request *req; 336 u64 off; 337 u64 len; 338 int i; 339 struct page **pages; 340 pgoff_t next_index; 341 int nr_pages = 0; 342 int got = 0; 343 int ret = 0; 344 345 if (!rw_ctx) { 346 /* caller of readpages does not hold buffer and read caps 347 * (fadvise, madvise and readahead cases) */ 348 int want = CEPH_CAP_FILE_CACHE; 349 ret = ceph_try_get_caps(inode, CEPH_CAP_FILE_RD, want, 350 true, &got); 351 if (ret < 0) { 352 dout("start_read %p, error getting cap\n", inode); 353 } else if (!(got & want)) { 354 dout("start_read %p, no cache cap\n", inode); 355 ret = 0; 356 } 357 if (ret <= 0) { 358 if (got) 359 ceph_put_cap_refs(ci, got); 360 while (!list_empty(page_list)) { 361 page = lru_to_page(page_list); 362 list_del(&page->lru); 363 put_page(page); 364 } 365 return ret; 366 } 367 } 368 369 off = (u64) page_offset(page); 370 371 /* count pages */ 372 next_index = page->index; 373 list_for_each_entry_reverse(page, page_list, lru) { 374 if (page->index != next_index) 375 break; 376 nr_pages++; 377 next_index++; 378 if (max && nr_pages == max) 379 break; 380 } 381 len = nr_pages << PAGE_SHIFT; 382 dout("start_read %p nr_pages %d is %lld~%lld\n", inode, nr_pages, 383 off, len); 384 vino = ceph_vino(inode); 385 req = ceph_osdc_new_request(osdc, &ci->i_layout, vino, off, &len, 386 0, 1, CEPH_OSD_OP_READ, 387 CEPH_OSD_FLAG_READ, NULL, 388 ci->i_truncate_seq, ci->i_truncate_size, 389 false); 390 if (IS_ERR(req)) { 391 ret = PTR_ERR(req); 392 goto out; 393 } 394 395 /* build page vector */ 396 nr_pages = calc_pages_for(0, len); 397 pages = kmalloc_array(nr_pages, sizeof(*pages), GFP_KERNEL); 398 if (!pages) { 399 ret = -ENOMEM; 400 goto out_put; 401 } 402 for (i = 0; i < nr_pages; ++i) { 403 page = list_entry(page_list->prev, struct page, lru); 404 BUG_ON(PageLocked(page)); 405 list_del(&page->lru); 406 407 dout("start_read %p adding %p idx %lu\n", inode, page, 408 page->index); 409 if (add_to_page_cache_lru(page, &inode->i_data, page->index, 410 GFP_KERNEL)) { 411 ceph_fscache_uncache_page(inode, page); 412 put_page(page); 413 dout("start_read %p add_to_page_cache failed %p\n", 414 inode, page); 415 nr_pages = i; 416 if (nr_pages > 0) { 417 len = nr_pages << PAGE_SHIFT; 418 osd_req_op_extent_update(req, 0, len); 419 break; 420 } 421 goto out_pages; 422 } 423 pages[i] = page; 424 } 425 osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0, false, false); 426 req->r_callback = finish_read; 427 req->r_inode = inode; 428 429 dout("start_read %p starting %p %lld~%lld\n", inode, req, off, len); 430 ret = ceph_osdc_start_request(osdc, req, false); 431 if (ret < 0) 432 goto out_pages; 433 ceph_osdc_put_request(req); 434 435 /* After adding locked pages to page cache, the inode holds cache cap. 436 * So we can drop our cap refs. */ 437 if (got) 438 ceph_put_cap_refs(ci, got); 439 440 return nr_pages; 441 442 out_pages: 443 for (i = 0; i < nr_pages; ++i) { 444 ceph_fscache_readpage_cancel(inode, pages[i]); 445 unlock_page(pages[i]); 446 } 447 ceph_put_page_vector(pages, nr_pages, false); 448 out_put: 449 ceph_osdc_put_request(req); 450 out: 451 if (got) 452 ceph_put_cap_refs(ci, got); 453 return ret; 454 } 455 456 457 /* 458 * Read multiple pages. Leave pages we don't read + unlock in page_list; 459 * the caller (VM) cleans them up. 460 */ 461 static int ceph_readpages(struct file *file, struct address_space *mapping, 462 struct list_head *page_list, unsigned nr_pages) 463 { 464 struct inode *inode = file_inode(file); 465 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 466 struct ceph_file_info *fi = file->private_data; 467 struct ceph_rw_context *rw_ctx; 468 int rc = 0; 469 int max = 0; 470 471 if (ceph_inode(inode)->i_inline_version != CEPH_INLINE_NONE) 472 return -EINVAL; 473 474 rc = ceph_readpages_from_fscache(mapping->host, mapping, page_list, 475 &nr_pages); 476 477 if (rc == 0) 478 goto out; 479 480 rw_ctx = ceph_find_rw_context(fi); 481 max = fsc->mount_options->rsize >> PAGE_SHIFT; 482 dout("readpages %p file %p ctx %p nr_pages %d max %d\n", 483 inode, file, rw_ctx, nr_pages, max); 484 while (!list_empty(page_list)) { 485 rc = start_read(inode, rw_ctx, page_list, max); 486 if (rc < 0) 487 goto out; 488 } 489 out: 490 ceph_fscache_readpages_cancel(inode, page_list); 491 492 dout("readpages %p file %p ret %d\n", inode, file, rc); 493 return rc; 494 } 495 496 struct ceph_writeback_ctl 497 { 498 loff_t i_size; 499 u64 truncate_size; 500 u32 truncate_seq; 501 bool size_stable; 502 bool head_snapc; 503 }; 504 505 /* 506 * Get ref for the oldest snapc for an inode with dirty data... that is, the 507 * only snap context we are allowed to write back. 508 */ 509 static struct ceph_snap_context * 510 get_oldest_context(struct inode *inode, struct ceph_writeback_ctl *ctl, 511 struct ceph_snap_context *page_snapc) 512 { 513 struct ceph_inode_info *ci = ceph_inode(inode); 514 struct ceph_snap_context *snapc = NULL; 515 struct ceph_cap_snap *capsnap = NULL; 516 517 spin_lock(&ci->i_ceph_lock); 518 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) { 519 dout(" cap_snap %p snapc %p has %d dirty pages\n", capsnap, 520 capsnap->context, capsnap->dirty_pages); 521 if (!capsnap->dirty_pages) 522 continue; 523 524 /* get i_size, truncate_{seq,size} for page_snapc? */ 525 if (snapc && capsnap->context != page_snapc) 526 continue; 527 528 if (ctl) { 529 if (capsnap->writing) { 530 ctl->i_size = i_size_read(inode); 531 ctl->size_stable = false; 532 } else { 533 ctl->i_size = capsnap->size; 534 ctl->size_stable = true; 535 } 536 ctl->truncate_size = capsnap->truncate_size; 537 ctl->truncate_seq = capsnap->truncate_seq; 538 ctl->head_snapc = false; 539 } 540 541 if (snapc) 542 break; 543 544 snapc = ceph_get_snap_context(capsnap->context); 545 if (!page_snapc || 546 page_snapc == snapc || 547 page_snapc->seq > snapc->seq) 548 break; 549 } 550 if (!snapc && ci->i_wrbuffer_ref_head) { 551 snapc = ceph_get_snap_context(ci->i_head_snapc); 552 dout(" head snapc %p has %d dirty pages\n", 553 snapc, ci->i_wrbuffer_ref_head); 554 if (ctl) { 555 ctl->i_size = i_size_read(inode); 556 ctl->truncate_size = ci->i_truncate_size; 557 ctl->truncate_seq = ci->i_truncate_seq; 558 ctl->size_stable = false; 559 ctl->head_snapc = true; 560 } 561 } 562 spin_unlock(&ci->i_ceph_lock); 563 return snapc; 564 } 565 566 static u64 get_writepages_data_length(struct inode *inode, 567 struct page *page, u64 start) 568 { 569 struct ceph_inode_info *ci = ceph_inode(inode); 570 struct ceph_snap_context *snapc = page_snap_context(page); 571 struct ceph_cap_snap *capsnap = NULL; 572 u64 end = i_size_read(inode); 573 574 if (snapc != ci->i_head_snapc) { 575 bool found = false; 576 spin_lock(&ci->i_ceph_lock); 577 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) { 578 if (capsnap->context == snapc) { 579 if (!capsnap->writing) 580 end = capsnap->size; 581 found = true; 582 break; 583 } 584 } 585 spin_unlock(&ci->i_ceph_lock); 586 WARN_ON(!found); 587 } 588 if (end > page_offset(page) + PAGE_SIZE) 589 end = page_offset(page) + PAGE_SIZE; 590 return end > start ? end - start : 0; 591 } 592 593 /* 594 * Write a single page, but leave the page locked. 595 * 596 * If we get a write error, mark the mapping for error, but still adjust the 597 * dirty page accounting (i.e., page is no longer dirty). 598 */ 599 static int writepage_nounlock(struct page *page, struct writeback_control *wbc) 600 { 601 struct inode *inode = page->mapping->host; 602 struct ceph_inode_info *ci = ceph_inode(inode); 603 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 604 struct ceph_snap_context *snapc, *oldest; 605 loff_t page_off = page_offset(page); 606 int err; 607 loff_t len = PAGE_SIZE; 608 struct ceph_writeback_ctl ceph_wbc; 609 struct ceph_osd_client *osdc = &fsc->client->osdc; 610 struct ceph_osd_request *req; 611 612 dout("writepage %p idx %lu\n", page, page->index); 613 614 /* verify this is a writeable snap context */ 615 snapc = page_snap_context(page); 616 if (!snapc) { 617 dout("writepage %p page %p not dirty?\n", inode, page); 618 return 0; 619 } 620 oldest = get_oldest_context(inode, &ceph_wbc, snapc); 621 if (snapc->seq > oldest->seq) { 622 dout("writepage %p page %p snapc %p not writeable - noop\n", 623 inode, page, snapc); 624 /* we should only noop if called by kswapd */ 625 WARN_ON(!(current->flags & PF_MEMALLOC)); 626 ceph_put_snap_context(oldest); 627 redirty_page_for_writepage(wbc, page); 628 return 0; 629 } 630 ceph_put_snap_context(oldest); 631 632 /* is this a partial page at end of file? */ 633 if (page_off >= ceph_wbc.i_size) { 634 dout("%p page eof %llu\n", page, ceph_wbc.i_size); 635 page->mapping->a_ops->invalidatepage(page, 0, PAGE_SIZE); 636 return 0; 637 } 638 639 if (ceph_wbc.i_size < page_off + len) 640 len = ceph_wbc.i_size - page_off; 641 642 dout("writepage %p page %p index %lu on %llu~%llu snapc %p seq %lld\n", 643 inode, page, page->index, page_off, len, snapc, snapc->seq); 644 645 if (atomic_long_inc_return(&fsc->writeback_count) > 646 CONGESTION_ON_THRESH(fsc->mount_options->congestion_kb)) 647 set_bdi_congested(inode_to_bdi(inode), BLK_RW_ASYNC); 648 649 set_page_writeback(page); 650 req = ceph_osdc_new_request(osdc, &ci->i_layout, ceph_vino(inode), page_off, &len, 0, 1, 651 CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE, snapc, 652 ceph_wbc.truncate_seq, ceph_wbc.truncate_size, 653 true); 654 if (IS_ERR(req)) { 655 redirty_page_for_writepage(wbc, page); 656 end_page_writeback(page); 657 return PTR_ERR(req); 658 } 659 660 /* it may be a short write due to an object boundary */ 661 WARN_ON_ONCE(len > PAGE_SIZE); 662 osd_req_op_extent_osd_data_pages(req, 0, &page, len, 0, false, false); 663 dout("writepage %llu~%llu (%llu bytes)\n", page_off, len, len); 664 665 req->r_mtime = inode->i_mtime; 666 err = ceph_osdc_start_request(osdc, req, true); 667 if (!err) 668 err = ceph_osdc_wait_request(osdc, req); 669 670 ceph_update_write_latency(&fsc->mdsc->metric, req->r_start_latency, 671 req->r_end_latency, err); 672 673 ceph_osdc_put_request(req); 674 if (err == 0) 675 err = len; 676 677 if (err < 0) { 678 struct writeback_control tmp_wbc; 679 if (!wbc) 680 wbc = &tmp_wbc; 681 if (err == -ERESTARTSYS) { 682 /* killed by SIGKILL */ 683 dout("writepage interrupted page %p\n", page); 684 redirty_page_for_writepage(wbc, page); 685 end_page_writeback(page); 686 return err; 687 } 688 if (err == -EBLOCKLISTED) 689 fsc->blocklisted = true; 690 dout("writepage setting page/mapping error %d %p\n", 691 err, page); 692 mapping_set_error(&inode->i_data, err); 693 wbc->pages_skipped++; 694 } else { 695 dout("writepage cleaned page %p\n", page); 696 err = 0; /* vfs expects us to return 0 */ 697 } 698 page->private = 0; 699 ClearPagePrivate(page); 700 end_page_writeback(page); 701 ceph_put_wrbuffer_cap_refs(ci, 1, snapc); 702 ceph_put_snap_context(snapc); /* page's reference */ 703 704 if (atomic_long_dec_return(&fsc->writeback_count) < 705 CONGESTION_OFF_THRESH(fsc->mount_options->congestion_kb)) 706 clear_bdi_congested(inode_to_bdi(inode), BLK_RW_ASYNC); 707 708 return err; 709 } 710 711 static int ceph_writepage(struct page *page, struct writeback_control *wbc) 712 { 713 int err; 714 struct inode *inode = page->mapping->host; 715 BUG_ON(!inode); 716 ihold(inode); 717 err = writepage_nounlock(page, wbc); 718 if (err == -ERESTARTSYS) { 719 /* direct memory reclaimer was killed by SIGKILL. return 0 720 * to prevent caller from setting mapping/page error */ 721 err = 0; 722 } 723 unlock_page(page); 724 iput(inode); 725 return err; 726 } 727 728 /* 729 * async writeback completion handler. 730 * 731 * If we get an error, set the mapping error bit, but not the individual 732 * page error bits. 733 */ 734 static void writepages_finish(struct ceph_osd_request *req) 735 { 736 struct inode *inode = req->r_inode; 737 struct ceph_inode_info *ci = ceph_inode(inode); 738 struct ceph_osd_data *osd_data; 739 struct page *page; 740 int num_pages, total_pages = 0; 741 int i, j; 742 int rc = req->r_result; 743 struct ceph_snap_context *snapc = req->r_snapc; 744 struct address_space *mapping = inode->i_mapping; 745 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 746 bool remove_page; 747 748 dout("writepages_finish %p rc %d\n", inode, rc); 749 if (rc < 0) { 750 mapping_set_error(mapping, rc); 751 ceph_set_error_write(ci); 752 if (rc == -EBLOCKLISTED) 753 fsc->blocklisted = true; 754 } else { 755 ceph_clear_error_write(ci); 756 } 757 758 ceph_update_write_latency(&fsc->mdsc->metric, req->r_start_latency, 759 req->r_end_latency, rc); 760 761 /* 762 * We lost the cache cap, need to truncate the page before 763 * it is unlocked, otherwise we'd truncate it later in the 764 * page truncation thread, possibly losing some data that 765 * raced its way in 766 */ 767 remove_page = !(ceph_caps_issued(ci) & 768 (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)); 769 770 /* clean all pages */ 771 for (i = 0; i < req->r_num_ops; i++) { 772 if (req->r_ops[i].op != CEPH_OSD_OP_WRITE) 773 break; 774 775 osd_data = osd_req_op_extent_osd_data(req, i); 776 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES); 777 num_pages = calc_pages_for((u64)osd_data->alignment, 778 (u64)osd_data->length); 779 total_pages += num_pages; 780 for (j = 0; j < num_pages; j++) { 781 page = osd_data->pages[j]; 782 BUG_ON(!page); 783 WARN_ON(!PageUptodate(page)); 784 785 if (atomic_long_dec_return(&fsc->writeback_count) < 786 CONGESTION_OFF_THRESH( 787 fsc->mount_options->congestion_kb)) 788 clear_bdi_congested(inode_to_bdi(inode), 789 BLK_RW_ASYNC); 790 791 ceph_put_snap_context(page_snap_context(page)); 792 page->private = 0; 793 ClearPagePrivate(page); 794 dout("unlocking %p\n", page); 795 end_page_writeback(page); 796 797 if (remove_page) 798 generic_error_remove_page(inode->i_mapping, 799 page); 800 801 unlock_page(page); 802 } 803 dout("writepages_finish %p wrote %llu bytes cleaned %d pages\n", 804 inode, osd_data->length, rc >= 0 ? num_pages : 0); 805 806 release_pages(osd_data->pages, num_pages); 807 } 808 809 ceph_put_wrbuffer_cap_refs(ci, total_pages, snapc); 810 811 osd_data = osd_req_op_extent_osd_data(req, 0); 812 if (osd_data->pages_from_pool) 813 mempool_free(osd_data->pages, ceph_wb_pagevec_pool); 814 else 815 kfree(osd_data->pages); 816 ceph_osdc_put_request(req); 817 } 818 819 /* 820 * initiate async writeback 821 */ 822 static int ceph_writepages_start(struct address_space *mapping, 823 struct writeback_control *wbc) 824 { 825 struct inode *inode = mapping->host; 826 struct ceph_inode_info *ci = ceph_inode(inode); 827 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 828 struct ceph_vino vino = ceph_vino(inode); 829 pgoff_t index, start_index, end = -1; 830 struct ceph_snap_context *snapc = NULL, *last_snapc = NULL, *pgsnapc; 831 struct pagevec pvec; 832 int rc = 0; 833 unsigned int wsize = i_blocksize(inode); 834 struct ceph_osd_request *req = NULL; 835 struct ceph_writeback_ctl ceph_wbc; 836 bool should_loop, range_whole = false; 837 bool done = false; 838 839 dout("writepages_start %p (mode=%s)\n", inode, 840 wbc->sync_mode == WB_SYNC_NONE ? "NONE" : 841 (wbc->sync_mode == WB_SYNC_ALL ? "ALL" : "HOLD")); 842 843 if (READ_ONCE(fsc->mount_state) >= CEPH_MOUNT_SHUTDOWN) { 844 if (ci->i_wrbuffer_ref > 0) { 845 pr_warn_ratelimited( 846 "writepage_start %p %lld forced umount\n", 847 inode, ceph_ino(inode)); 848 } 849 mapping_set_error(mapping, -EIO); 850 return -EIO; /* we're in a forced umount, don't write! */ 851 } 852 if (fsc->mount_options->wsize < wsize) 853 wsize = fsc->mount_options->wsize; 854 855 pagevec_init(&pvec); 856 857 start_index = wbc->range_cyclic ? mapping->writeback_index : 0; 858 index = start_index; 859 860 retry: 861 /* find oldest snap context with dirty data */ 862 snapc = get_oldest_context(inode, &ceph_wbc, NULL); 863 if (!snapc) { 864 /* hmm, why does writepages get called when there 865 is no dirty data? */ 866 dout(" no snap context with dirty data?\n"); 867 goto out; 868 } 869 dout(" oldest snapc is %p seq %lld (%d snaps)\n", 870 snapc, snapc->seq, snapc->num_snaps); 871 872 should_loop = false; 873 if (ceph_wbc.head_snapc && snapc != last_snapc) { 874 /* where to start/end? */ 875 if (wbc->range_cyclic) { 876 index = start_index; 877 end = -1; 878 if (index > 0) 879 should_loop = true; 880 dout(" cyclic, start at %lu\n", index); 881 } else { 882 index = wbc->range_start >> PAGE_SHIFT; 883 end = wbc->range_end >> PAGE_SHIFT; 884 if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) 885 range_whole = true; 886 dout(" not cyclic, %lu to %lu\n", index, end); 887 } 888 } else if (!ceph_wbc.head_snapc) { 889 /* Do not respect wbc->range_{start,end}. Dirty pages 890 * in that range can be associated with newer snapc. 891 * They are not writeable until we write all dirty pages 892 * associated with 'snapc' get written */ 893 if (index > 0) 894 should_loop = true; 895 dout(" non-head snapc, range whole\n"); 896 } 897 898 ceph_put_snap_context(last_snapc); 899 last_snapc = snapc; 900 901 while (!done && index <= end) { 902 int num_ops = 0, op_idx; 903 unsigned i, pvec_pages, max_pages, locked_pages = 0; 904 struct page **pages = NULL, **data_pages; 905 struct page *page; 906 pgoff_t strip_unit_end = 0; 907 u64 offset = 0, len = 0; 908 bool from_pool = false; 909 910 max_pages = wsize >> PAGE_SHIFT; 911 912 get_more_pages: 913 pvec_pages = pagevec_lookup_range_tag(&pvec, mapping, &index, 914 end, PAGECACHE_TAG_DIRTY); 915 dout("pagevec_lookup_range_tag got %d\n", pvec_pages); 916 if (!pvec_pages && !locked_pages) 917 break; 918 for (i = 0; i < pvec_pages && locked_pages < max_pages; i++) { 919 page = pvec.pages[i]; 920 dout("? %p idx %lu\n", page, page->index); 921 if (locked_pages == 0) 922 lock_page(page); /* first page */ 923 else if (!trylock_page(page)) 924 break; 925 926 /* only dirty pages, or our accounting breaks */ 927 if (unlikely(!PageDirty(page)) || 928 unlikely(page->mapping != mapping)) { 929 dout("!dirty or !mapping %p\n", page); 930 unlock_page(page); 931 continue; 932 } 933 /* only if matching snap context */ 934 pgsnapc = page_snap_context(page); 935 if (pgsnapc != snapc) { 936 dout("page snapc %p %lld != oldest %p %lld\n", 937 pgsnapc, pgsnapc->seq, snapc, snapc->seq); 938 if (!should_loop && 939 !ceph_wbc.head_snapc && 940 wbc->sync_mode != WB_SYNC_NONE) 941 should_loop = true; 942 unlock_page(page); 943 continue; 944 } 945 if (page_offset(page) >= ceph_wbc.i_size) { 946 dout("%p page eof %llu\n", 947 page, ceph_wbc.i_size); 948 if ((ceph_wbc.size_stable || 949 page_offset(page) >= i_size_read(inode)) && 950 clear_page_dirty_for_io(page)) 951 mapping->a_ops->invalidatepage(page, 952 0, PAGE_SIZE); 953 unlock_page(page); 954 continue; 955 } 956 if (strip_unit_end && (page->index > strip_unit_end)) { 957 dout("end of strip unit %p\n", page); 958 unlock_page(page); 959 break; 960 } 961 if (PageWriteback(page)) { 962 if (wbc->sync_mode == WB_SYNC_NONE) { 963 dout("%p under writeback\n", page); 964 unlock_page(page); 965 continue; 966 } 967 dout("waiting on writeback %p\n", page); 968 wait_on_page_writeback(page); 969 } 970 971 if (!clear_page_dirty_for_io(page)) { 972 dout("%p !clear_page_dirty_for_io\n", page); 973 unlock_page(page); 974 continue; 975 } 976 977 /* 978 * We have something to write. If this is 979 * the first locked page this time through, 980 * calculate max possinle write size and 981 * allocate a page array 982 */ 983 if (locked_pages == 0) { 984 u64 objnum; 985 u64 objoff; 986 u32 xlen; 987 988 /* prepare async write request */ 989 offset = (u64)page_offset(page); 990 ceph_calc_file_object_mapping(&ci->i_layout, 991 offset, wsize, 992 &objnum, &objoff, 993 &xlen); 994 len = xlen; 995 996 num_ops = 1; 997 strip_unit_end = page->index + 998 ((len - 1) >> PAGE_SHIFT); 999 1000 BUG_ON(pages); 1001 max_pages = calc_pages_for(0, (u64)len); 1002 pages = kmalloc_array(max_pages, 1003 sizeof(*pages), 1004 GFP_NOFS); 1005 if (!pages) { 1006 from_pool = true; 1007 pages = mempool_alloc(ceph_wb_pagevec_pool, GFP_NOFS); 1008 BUG_ON(!pages); 1009 } 1010 1011 len = 0; 1012 } else if (page->index != 1013 (offset + len) >> PAGE_SHIFT) { 1014 if (num_ops >= (from_pool ? CEPH_OSD_SLAB_OPS : 1015 CEPH_OSD_MAX_OPS)) { 1016 redirty_page_for_writepage(wbc, page); 1017 unlock_page(page); 1018 break; 1019 } 1020 1021 num_ops++; 1022 offset = (u64)page_offset(page); 1023 len = 0; 1024 } 1025 1026 /* note position of first page in pvec */ 1027 dout("%p will write page %p idx %lu\n", 1028 inode, page, page->index); 1029 1030 if (atomic_long_inc_return(&fsc->writeback_count) > 1031 CONGESTION_ON_THRESH( 1032 fsc->mount_options->congestion_kb)) { 1033 set_bdi_congested(inode_to_bdi(inode), 1034 BLK_RW_ASYNC); 1035 } 1036 1037 1038 pages[locked_pages++] = page; 1039 pvec.pages[i] = NULL; 1040 1041 len += PAGE_SIZE; 1042 } 1043 1044 /* did we get anything? */ 1045 if (!locked_pages) 1046 goto release_pvec_pages; 1047 if (i) { 1048 unsigned j, n = 0; 1049 /* shift unused page to beginning of pvec */ 1050 for (j = 0; j < pvec_pages; j++) { 1051 if (!pvec.pages[j]) 1052 continue; 1053 if (n < j) 1054 pvec.pages[n] = pvec.pages[j]; 1055 n++; 1056 } 1057 pvec.nr = n; 1058 1059 if (pvec_pages && i == pvec_pages && 1060 locked_pages < max_pages) { 1061 dout("reached end pvec, trying for more\n"); 1062 pagevec_release(&pvec); 1063 goto get_more_pages; 1064 } 1065 } 1066 1067 new_request: 1068 offset = page_offset(pages[0]); 1069 len = wsize; 1070 1071 req = ceph_osdc_new_request(&fsc->client->osdc, 1072 &ci->i_layout, vino, 1073 offset, &len, 0, num_ops, 1074 CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE, 1075 snapc, ceph_wbc.truncate_seq, 1076 ceph_wbc.truncate_size, false); 1077 if (IS_ERR(req)) { 1078 req = ceph_osdc_new_request(&fsc->client->osdc, 1079 &ci->i_layout, vino, 1080 offset, &len, 0, 1081 min(num_ops, 1082 CEPH_OSD_SLAB_OPS), 1083 CEPH_OSD_OP_WRITE, 1084 CEPH_OSD_FLAG_WRITE, 1085 snapc, ceph_wbc.truncate_seq, 1086 ceph_wbc.truncate_size, true); 1087 BUG_ON(IS_ERR(req)); 1088 } 1089 BUG_ON(len < page_offset(pages[locked_pages - 1]) + 1090 PAGE_SIZE - offset); 1091 1092 req->r_callback = writepages_finish; 1093 req->r_inode = inode; 1094 1095 /* Format the osd request message and submit the write */ 1096 len = 0; 1097 data_pages = pages; 1098 op_idx = 0; 1099 for (i = 0; i < locked_pages; i++) { 1100 u64 cur_offset = page_offset(pages[i]); 1101 if (offset + len != cur_offset) { 1102 if (op_idx + 1 == req->r_num_ops) 1103 break; 1104 osd_req_op_extent_dup_last(req, op_idx, 1105 cur_offset - offset); 1106 dout("writepages got pages at %llu~%llu\n", 1107 offset, len); 1108 osd_req_op_extent_osd_data_pages(req, op_idx, 1109 data_pages, len, 0, 1110 from_pool, false); 1111 osd_req_op_extent_update(req, op_idx, len); 1112 1113 len = 0; 1114 offset = cur_offset; 1115 data_pages = pages + i; 1116 op_idx++; 1117 } 1118 1119 set_page_writeback(pages[i]); 1120 len += PAGE_SIZE; 1121 } 1122 1123 if (ceph_wbc.size_stable) { 1124 len = min(len, ceph_wbc.i_size - offset); 1125 } else if (i == locked_pages) { 1126 /* writepages_finish() clears writeback pages 1127 * according to the data length, so make sure 1128 * data length covers all locked pages */ 1129 u64 min_len = len + 1 - PAGE_SIZE; 1130 len = get_writepages_data_length(inode, pages[i - 1], 1131 offset); 1132 len = max(len, min_len); 1133 } 1134 dout("writepages got pages at %llu~%llu\n", offset, len); 1135 1136 osd_req_op_extent_osd_data_pages(req, op_idx, data_pages, len, 1137 0, from_pool, false); 1138 osd_req_op_extent_update(req, op_idx, len); 1139 1140 BUG_ON(op_idx + 1 != req->r_num_ops); 1141 1142 from_pool = false; 1143 if (i < locked_pages) { 1144 BUG_ON(num_ops <= req->r_num_ops); 1145 num_ops -= req->r_num_ops; 1146 locked_pages -= i; 1147 1148 /* allocate new pages array for next request */ 1149 data_pages = pages; 1150 pages = kmalloc_array(locked_pages, sizeof(*pages), 1151 GFP_NOFS); 1152 if (!pages) { 1153 from_pool = true; 1154 pages = mempool_alloc(ceph_wb_pagevec_pool, GFP_NOFS); 1155 BUG_ON(!pages); 1156 } 1157 memcpy(pages, data_pages + i, 1158 locked_pages * sizeof(*pages)); 1159 memset(data_pages + i, 0, 1160 locked_pages * sizeof(*pages)); 1161 } else { 1162 BUG_ON(num_ops != req->r_num_ops); 1163 index = pages[i - 1]->index + 1; 1164 /* request message now owns the pages array */ 1165 pages = NULL; 1166 } 1167 1168 req->r_mtime = inode->i_mtime; 1169 rc = ceph_osdc_start_request(&fsc->client->osdc, req, true); 1170 BUG_ON(rc); 1171 req = NULL; 1172 1173 wbc->nr_to_write -= i; 1174 if (pages) 1175 goto new_request; 1176 1177 /* 1178 * We stop writing back only if we are not doing 1179 * integrity sync. In case of integrity sync we have to 1180 * keep going until we have written all the pages 1181 * we tagged for writeback prior to entering this loop. 1182 */ 1183 if (wbc->nr_to_write <= 0 && wbc->sync_mode == WB_SYNC_NONE) 1184 done = true; 1185 1186 release_pvec_pages: 1187 dout("pagevec_release on %d pages (%p)\n", (int)pvec.nr, 1188 pvec.nr ? pvec.pages[0] : NULL); 1189 pagevec_release(&pvec); 1190 } 1191 1192 if (should_loop && !done) { 1193 /* more to do; loop back to beginning of file */ 1194 dout("writepages looping back to beginning of file\n"); 1195 end = start_index - 1; /* OK even when start_index == 0 */ 1196 1197 /* to write dirty pages associated with next snapc, 1198 * we need to wait until current writes complete */ 1199 if (wbc->sync_mode != WB_SYNC_NONE && 1200 start_index == 0 && /* all dirty pages were checked */ 1201 !ceph_wbc.head_snapc) { 1202 struct page *page; 1203 unsigned i, nr; 1204 index = 0; 1205 while ((index <= end) && 1206 (nr = pagevec_lookup_tag(&pvec, mapping, &index, 1207 PAGECACHE_TAG_WRITEBACK))) { 1208 for (i = 0; i < nr; i++) { 1209 page = pvec.pages[i]; 1210 if (page_snap_context(page) != snapc) 1211 continue; 1212 wait_on_page_writeback(page); 1213 } 1214 pagevec_release(&pvec); 1215 cond_resched(); 1216 } 1217 } 1218 1219 start_index = 0; 1220 index = 0; 1221 goto retry; 1222 } 1223 1224 if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) 1225 mapping->writeback_index = index; 1226 1227 out: 1228 ceph_osdc_put_request(req); 1229 ceph_put_snap_context(last_snapc); 1230 dout("writepages dend - startone, rc = %d\n", rc); 1231 return rc; 1232 } 1233 1234 1235 1236 /* 1237 * See if a given @snapc is either writeable, or already written. 1238 */ 1239 static int context_is_writeable_or_written(struct inode *inode, 1240 struct ceph_snap_context *snapc) 1241 { 1242 struct ceph_snap_context *oldest = get_oldest_context(inode, NULL, NULL); 1243 int ret = !oldest || snapc->seq <= oldest->seq; 1244 1245 ceph_put_snap_context(oldest); 1246 return ret; 1247 } 1248 1249 /** 1250 * ceph_find_incompatible - find an incompatible context and return it 1251 * @page: page being dirtied 1252 * 1253 * We are only allowed to write into/dirty a page if the page is 1254 * clean, or already dirty within the same snap context. Returns a 1255 * conflicting context if there is one, NULL if there isn't, or a 1256 * negative error code on other errors. 1257 * 1258 * Must be called with page lock held. 1259 */ 1260 static struct ceph_snap_context * 1261 ceph_find_incompatible(struct page *page) 1262 { 1263 struct inode *inode = page->mapping->host; 1264 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 1265 struct ceph_inode_info *ci = ceph_inode(inode); 1266 1267 if (READ_ONCE(fsc->mount_state) >= CEPH_MOUNT_SHUTDOWN) { 1268 dout(" page %p forced umount\n", page); 1269 return ERR_PTR(-EIO); 1270 } 1271 1272 for (;;) { 1273 struct ceph_snap_context *snapc, *oldest; 1274 1275 wait_on_page_writeback(page); 1276 1277 snapc = page_snap_context(page); 1278 if (!snapc || snapc == ci->i_head_snapc) 1279 break; 1280 1281 /* 1282 * this page is already dirty in another (older) snap 1283 * context! is it writeable now? 1284 */ 1285 oldest = get_oldest_context(inode, NULL, NULL); 1286 if (snapc->seq > oldest->seq) { 1287 /* not writeable -- return it for the caller to deal with */ 1288 ceph_put_snap_context(oldest); 1289 dout(" page %p snapc %p not current or oldest\n", page, snapc); 1290 return ceph_get_snap_context(snapc); 1291 } 1292 ceph_put_snap_context(oldest); 1293 1294 /* yay, writeable, do it now (without dropping page lock) */ 1295 dout(" page %p snapc %p not current, but oldest\n", page, snapc); 1296 if (clear_page_dirty_for_io(page)) { 1297 int r = writepage_nounlock(page, NULL); 1298 if (r < 0) 1299 return ERR_PTR(r); 1300 } 1301 } 1302 return NULL; 1303 } 1304 1305 /* 1306 * We are only allowed to write into/dirty the page if the page is 1307 * clean, or already dirty within the same snap context. 1308 */ 1309 static int ceph_write_begin(struct file *file, struct address_space *mapping, 1310 loff_t pos, unsigned len, unsigned flags, 1311 struct page **pagep, void **fsdata) 1312 { 1313 struct inode *inode = file_inode(file); 1314 struct ceph_inode_info *ci = ceph_inode(inode); 1315 struct ceph_snap_context *snapc; 1316 struct page *page = NULL; 1317 pgoff_t index = pos >> PAGE_SHIFT; 1318 int pos_in_page = pos & ~PAGE_MASK; 1319 int r = 0; 1320 1321 dout("write_begin file %p inode %p page %p %d~%d\n", file, inode, page, (int)pos, (int)len); 1322 1323 for (;;) { 1324 page = grab_cache_page_write_begin(mapping, index, flags); 1325 if (!page) { 1326 r = -ENOMEM; 1327 break; 1328 } 1329 1330 snapc = ceph_find_incompatible(page); 1331 if (snapc) { 1332 if (IS_ERR(snapc)) { 1333 r = PTR_ERR(snapc); 1334 break; 1335 } 1336 unlock_page(page); 1337 put_page(page); 1338 page = NULL; 1339 ceph_queue_writeback(inode); 1340 r = wait_event_killable(ci->i_cap_wq, 1341 context_is_writeable_or_written(inode, snapc)); 1342 ceph_put_snap_context(snapc); 1343 if (r != 0) 1344 break; 1345 continue; 1346 } 1347 1348 if (PageUptodate(page)) { 1349 dout(" page %p already uptodate\n", page); 1350 break; 1351 } 1352 1353 /* 1354 * In some cases we don't need to read at all: 1355 * - full page write 1356 * - write that lies completely beyond EOF 1357 * - write that covers the the page from start to EOF or beyond it 1358 */ 1359 if ((pos_in_page == 0 && len == PAGE_SIZE) || 1360 (pos >= i_size_read(inode)) || 1361 (pos_in_page == 0 && (pos + len) >= i_size_read(inode))) { 1362 zero_user_segments(page, 0, pos_in_page, 1363 pos_in_page + len, PAGE_SIZE); 1364 break; 1365 } 1366 1367 /* 1368 * We need to read it. If we get back -EINPROGRESS, then the page was 1369 * handed off to fscache and it will be unlocked when the read completes. 1370 * Refind the page in that case so we can reacquire the page lock. Otherwise 1371 * we got a hard error or the read was completed synchronously. 1372 */ 1373 r = ceph_do_readpage(file, page); 1374 if (r != -EINPROGRESS) 1375 break; 1376 } 1377 1378 if (r < 0) { 1379 if (page) { 1380 unlock_page(page); 1381 put_page(page); 1382 } 1383 } else { 1384 *pagep = page; 1385 } 1386 return r; 1387 } 1388 1389 /* 1390 * we don't do anything in here that simple_write_end doesn't do 1391 * except adjust dirty page accounting 1392 */ 1393 static int ceph_write_end(struct file *file, struct address_space *mapping, 1394 loff_t pos, unsigned len, unsigned copied, 1395 struct page *page, void *fsdata) 1396 { 1397 struct inode *inode = file_inode(file); 1398 bool check_cap = false; 1399 1400 dout("write_end file %p inode %p page %p %d~%d (%d)\n", file, 1401 inode, page, (int)pos, (int)copied, (int)len); 1402 1403 /* zero the stale part of the page if we did a short copy */ 1404 if (!PageUptodate(page)) { 1405 if (copied < len) { 1406 copied = 0; 1407 goto out; 1408 } 1409 SetPageUptodate(page); 1410 } 1411 1412 /* did file size increase? */ 1413 if (pos+copied > i_size_read(inode)) 1414 check_cap = ceph_inode_set_size(inode, pos+copied); 1415 1416 set_page_dirty(page); 1417 1418 out: 1419 unlock_page(page); 1420 put_page(page); 1421 1422 if (check_cap) 1423 ceph_check_caps(ceph_inode(inode), CHECK_CAPS_AUTHONLY, NULL); 1424 1425 return copied; 1426 } 1427 1428 /* 1429 * we set .direct_IO to indicate direct io is supported, but since we 1430 * intercept O_DIRECT reads and writes early, this function should 1431 * never get called. 1432 */ 1433 static ssize_t ceph_direct_io(struct kiocb *iocb, struct iov_iter *iter) 1434 { 1435 WARN_ON(1); 1436 return -EINVAL; 1437 } 1438 1439 const struct address_space_operations ceph_aops = { 1440 .readpage = ceph_readpage, 1441 .readpages = ceph_readpages, 1442 .writepage = ceph_writepage, 1443 .writepages = ceph_writepages_start, 1444 .write_begin = ceph_write_begin, 1445 .write_end = ceph_write_end, 1446 .set_page_dirty = ceph_set_page_dirty, 1447 .invalidatepage = ceph_invalidatepage, 1448 .releasepage = ceph_releasepage, 1449 .direct_IO = ceph_direct_io, 1450 }; 1451 1452 static void ceph_block_sigs(sigset_t *oldset) 1453 { 1454 sigset_t mask; 1455 siginitsetinv(&mask, sigmask(SIGKILL)); 1456 sigprocmask(SIG_BLOCK, &mask, oldset); 1457 } 1458 1459 static void ceph_restore_sigs(sigset_t *oldset) 1460 { 1461 sigprocmask(SIG_SETMASK, oldset, NULL); 1462 } 1463 1464 /* 1465 * vm ops 1466 */ 1467 static vm_fault_t ceph_filemap_fault(struct vm_fault *vmf) 1468 { 1469 struct vm_area_struct *vma = vmf->vma; 1470 struct inode *inode = file_inode(vma->vm_file); 1471 struct ceph_inode_info *ci = ceph_inode(inode); 1472 struct ceph_file_info *fi = vma->vm_file->private_data; 1473 struct page *pinned_page = NULL; 1474 loff_t off = (loff_t)vmf->pgoff << PAGE_SHIFT; 1475 int want, got, err; 1476 sigset_t oldset; 1477 vm_fault_t ret = VM_FAULT_SIGBUS; 1478 1479 ceph_block_sigs(&oldset); 1480 1481 dout("filemap_fault %p %llx.%llx %llu~%zd trying to get caps\n", 1482 inode, ceph_vinop(inode), off, (size_t)PAGE_SIZE); 1483 if (fi->fmode & CEPH_FILE_MODE_LAZY) 1484 want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO; 1485 else 1486 want = CEPH_CAP_FILE_CACHE; 1487 1488 got = 0; 1489 err = ceph_get_caps(vma->vm_file, CEPH_CAP_FILE_RD, want, -1, 1490 &got, &pinned_page); 1491 if (err < 0) 1492 goto out_restore; 1493 1494 dout("filemap_fault %p %llu~%zd got cap refs on %s\n", 1495 inode, off, (size_t)PAGE_SIZE, ceph_cap_string(got)); 1496 1497 if ((got & (CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO)) || 1498 ci->i_inline_version == CEPH_INLINE_NONE) { 1499 CEPH_DEFINE_RW_CONTEXT(rw_ctx, got); 1500 ceph_add_rw_context(fi, &rw_ctx); 1501 ret = filemap_fault(vmf); 1502 ceph_del_rw_context(fi, &rw_ctx); 1503 dout("filemap_fault %p %llu~%zd drop cap refs %s ret %x\n", 1504 inode, off, (size_t)PAGE_SIZE, 1505 ceph_cap_string(got), ret); 1506 } else 1507 err = -EAGAIN; 1508 1509 if (pinned_page) 1510 put_page(pinned_page); 1511 ceph_put_cap_refs(ci, got); 1512 1513 if (err != -EAGAIN) 1514 goto out_restore; 1515 1516 /* read inline data */ 1517 if (off >= PAGE_SIZE) { 1518 /* does not support inline data > PAGE_SIZE */ 1519 ret = VM_FAULT_SIGBUS; 1520 } else { 1521 struct address_space *mapping = inode->i_mapping; 1522 struct page *page = find_or_create_page(mapping, 0, 1523 mapping_gfp_constraint(mapping, 1524 ~__GFP_FS)); 1525 if (!page) { 1526 ret = VM_FAULT_OOM; 1527 goto out_inline; 1528 } 1529 err = __ceph_do_getattr(inode, page, 1530 CEPH_STAT_CAP_INLINE_DATA, true); 1531 if (err < 0 || off >= i_size_read(inode)) { 1532 unlock_page(page); 1533 put_page(page); 1534 ret = vmf_error(err); 1535 goto out_inline; 1536 } 1537 if (err < PAGE_SIZE) 1538 zero_user_segment(page, err, PAGE_SIZE); 1539 else 1540 flush_dcache_page(page); 1541 SetPageUptodate(page); 1542 vmf->page = page; 1543 ret = VM_FAULT_MAJOR | VM_FAULT_LOCKED; 1544 out_inline: 1545 dout("filemap_fault %p %llu~%zd read inline data ret %x\n", 1546 inode, off, (size_t)PAGE_SIZE, ret); 1547 } 1548 out_restore: 1549 ceph_restore_sigs(&oldset); 1550 if (err < 0) 1551 ret = vmf_error(err); 1552 1553 return ret; 1554 } 1555 1556 /* 1557 * Reuse write_begin here for simplicity. 1558 */ 1559 static vm_fault_t ceph_page_mkwrite(struct vm_fault *vmf) 1560 { 1561 struct vm_area_struct *vma = vmf->vma; 1562 struct inode *inode = file_inode(vma->vm_file); 1563 struct ceph_inode_info *ci = ceph_inode(inode); 1564 struct ceph_file_info *fi = vma->vm_file->private_data; 1565 struct ceph_cap_flush *prealloc_cf; 1566 struct page *page = vmf->page; 1567 loff_t off = page_offset(page); 1568 loff_t size = i_size_read(inode); 1569 size_t len; 1570 int want, got, err; 1571 sigset_t oldset; 1572 vm_fault_t ret = VM_FAULT_SIGBUS; 1573 1574 prealloc_cf = ceph_alloc_cap_flush(); 1575 if (!prealloc_cf) 1576 return VM_FAULT_OOM; 1577 1578 sb_start_pagefault(inode->i_sb); 1579 ceph_block_sigs(&oldset); 1580 1581 if (ci->i_inline_version != CEPH_INLINE_NONE) { 1582 struct page *locked_page = NULL; 1583 if (off == 0) { 1584 lock_page(page); 1585 locked_page = page; 1586 } 1587 err = ceph_uninline_data(vma->vm_file, locked_page); 1588 if (locked_page) 1589 unlock_page(locked_page); 1590 if (err < 0) 1591 goto out_free; 1592 } 1593 1594 if (off + PAGE_SIZE <= size) 1595 len = PAGE_SIZE; 1596 else 1597 len = size & ~PAGE_MASK; 1598 1599 dout("page_mkwrite %p %llx.%llx %llu~%zd getting caps i_size %llu\n", 1600 inode, ceph_vinop(inode), off, len, size); 1601 if (fi->fmode & CEPH_FILE_MODE_LAZY) 1602 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO; 1603 else 1604 want = CEPH_CAP_FILE_BUFFER; 1605 1606 got = 0; 1607 err = ceph_get_caps(vma->vm_file, CEPH_CAP_FILE_WR, want, off + len, 1608 &got, NULL); 1609 if (err < 0) 1610 goto out_free; 1611 1612 dout("page_mkwrite %p %llu~%zd got cap refs on %s\n", 1613 inode, off, len, ceph_cap_string(got)); 1614 1615 /* Update time before taking page lock */ 1616 file_update_time(vma->vm_file); 1617 inode_inc_iversion_raw(inode); 1618 1619 do { 1620 struct ceph_snap_context *snapc; 1621 1622 lock_page(page); 1623 1624 if (page_mkwrite_check_truncate(page, inode) < 0) { 1625 unlock_page(page); 1626 ret = VM_FAULT_NOPAGE; 1627 break; 1628 } 1629 1630 snapc = ceph_find_incompatible(page); 1631 if (!snapc) { 1632 /* success. we'll keep the page locked. */ 1633 set_page_dirty(page); 1634 ret = VM_FAULT_LOCKED; 1635 break; 1636 } 1637 1638 unlock_page(page); 1639 1640 if (IS_ERR(snapc)) { 1641 ret = VM_FAULT_SIGBUS; 1642 break; 1643 } 1644 1645 ceph_queue_writeback(inode); 1646 err = wait_event_killable(ci->i_cap_wq, 1647 context_is_writeable_or_written(inode, snapc)); 1648 ceph_put_snap_context(snapc); 1649 } while (err == 0); 1650 1651 if (ret == VM_FAULT_LOCKED || 1652 ci->i_inline_version != CEPH_INLINE_NONE) { 1653 int dirty; 1654 spin_lock(&ci->i_ceph_lock); 1655 ci->i_inline_version = CEPH_INLINE_NONE; 1656 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR, 1657 &prealloc_cf); 1658 spin_unlock(&ci->i_ceph_lock); 1659 if (dirty) 1660 __mark_inode_dirty(inode, dirty); 1661 } 1662 1663 dout("page_mkwrite %p %llu~%zd dropping cap refs on %s ret %x\n", 1664 inode, off, len, ceph_cap_string(got), ret); 1665 ceph_put_cap_refs_async(ci, got); 1666 out_free: 1667 ceph_restore_sigs(&oldset); 1668 sb_end_pagefault(inode->i_sb); 1669 ceph_free_cap_flush(prealloc_cf); 1670 if (err < 0) 1671 ret = vmf_error(err); 1672 return ret; 1673 } 1674 1675 void ceph_fill_inline_data(struct inode *inode, struct page *locked_page, 1676 char *data, size_t len) 1677 { 1678 struct address_space *mapping = inode->i_mapping; 1679 struct page *page; 1680 1681 if (locked_page) { 1682 page = locked_page; 1683 } else { 1684 if (i_size_read(inode) == 0) 1685 return; 1686 page = find_or_create_page(mapping, 0, 1687 mapping_gfp_constraint(mapping, 1688 ~__GFP_FS)); 1689 if (!page) 1690 return; 1691 if (PageUptodate(page)) { 1692 unlock_page(page); 1693 put_page(page); 1694 return; 1695 } 1696 } 1697 1698 dout("fill_inline_data %p %llx.%llx len %zu locked_page %p\n", 1699 inode, ceph_vinop(inode), len, locked_page); 1700 1701 if (len > 0) { 1702 void *kaddr = kmap_atomic(page); 1703 memcpy(kaddr, data, len); 1704 kunmap_atomic(kaddr); 1705 } 1706 1707 if (page != locked_page) { 1708 if (len < PAGE_SIZE) 1709 zero_user_segment(page, len, PAGE_SIZE); 1710 else 1711 flush_dcache_page(page); 1712 1713 SetPageUptodate(page); 1714 unlock_page(page); 1715 put_page(page); 1716 } 1717 } 1718 1719 int ceph_uninline_data(struct file *filp, struct page *locked_page) 1720 { 1721 struct inode *inode = file_inode(filp); 1722 struct ceph_inode_info *ci = ceph_inode(inode); 1723 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 1724 struct ceph_osd_request *req; 1725 struct page *page = NULL; 1726 u64 len, inline_version; 1727 int err = 0; 1728 bool from_pagecache = false; 1729 1730 spin_lock(&ci->i_ceph_lock); 1731 inline_version = ci->i_inline_version; 1732 spin_unlock(&ci->i_ceph_lock); 1733 1734 dout("uninline_data %p %llx.%llx inline_version %llu\n", 1735 inode, ceph_vinop(inode), inline_version); 1736 1737 if (inline_version == 1 || /* initial version, no data */ 1738 inline_version == CEPH_INLINE_NONE) 1739 goto out; 1740 1741 if (locked_page) { 1742 page = locked_page; 1743 WARN_ON(!PageUptodate(page)); 1744 } else if (ceph_caps_issued(ci) & 1745 (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) { 1746 page = find_get_page(inode->i_mapping, 0); 1747 if (page) { 1748 if (PageUptodate(page)) { 1749 from_pagecache = true; 1750 lock_page(page); 1751 } else { 1752 put_page(page); 1753 page = NULL; 1754 } 1755 } 1756 } 1757 1758 if (page) { 1759 len = i_size_read(inode); 1760 if (len > PAGE_SIZE) 1761 len = PAGE_SIZE; 1762 } else { 1763 page = __page_cache_alloc(GFP_NOFS); 1764 if (!page) { 1765 err = -ENOMEM; 1766 goto out; 1767 } 1768 err = __ceph_do_getattr(inode, page, 1769 CEPH_STAT_CAP_INLINE_DATA, true); 1770 if (err < 0) { 1771 /* no inline data */ 1772 if (err == -ENODATA) 1773 err = 0; 1774 goto out; 1775 } 1776 len = err; 1777 } 1778 1779 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, 1780 ceph_vino(inode), 0, &len, 0, 1, 1781 CEPH_OSD_OP_CREATE, CEPH_OSD_FLAG_WRITE, 1782 NULL, 0, 0, false); 1783 if (IS_ERR(req)) { 1784 err = PTR_ERR(req); 1785 goto out; 1786 } 1787 1788 req->r_mtime = inode->i_mtime; 1789 err = ceph_osdc_start_request(&fsc->client->osdc, req, false); 1790 if (!err) 1791 err = ceph_osdc_wait_request(&fsc->client->osdc, req); 1792 ceph_osdc_put_request(req); 1793 if (err < 0) 1794 goto out; 1795 1796 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, 1797 ceph_vino(inode), 0, &len, 1, 3, 1798 CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE, 1799 NULL, ci->i_truncate_seq, 1800 ci->i_truncate_size, false); 1801 if (IS_ERR(req)) { 1802 err = PTR_ERR(req); 1803 goto out; 1804 } 1805 1806 osd_req_op_extent_osd_data_pages(req, 1, &page, len, 0, false, false); 1807 1808 { 1809 __le64 xattr_buf = cpu_to_le64(inline_version); 1810 err = osd_req_op_xattr_init(req, 0, CEPH_OSD_OP_CMPXATTR, 1811 "inline_version", &xattr_buf, 1812 sizeof(xattr_buf), 1813 CEPH_OSD_CMPXATTR_OP_GT, 1814 CEPH_OSD_CMPXATTR_MODE_U64); 1815 if (err) 1816 goto out_put; 1817 } 1818 1819 { 1820 char xattr_buf[32]; 1821 int xattr_len = snprintf(xattr_buf, sizeof(xattr_buf), 1822 "%llu", inline_version); 1823 err = osd_req_op_xattr_init(req, 2, CEPH_OSD_OP_SETXATTR, 1824 "inline_version", 1825 xattr_buf, xattr_len, 0, 0); 1826 if (err) 1827 goto out_put; 1828 } 1829 1830 req->r_mtime = inode->i_mtime; 1831 err = ceph_osdc_start_request(&fsc->client->osdc, req, false); 1832 if (!err) 1833 err = ceph_osdc_wait_request(&fsc->client->osdc, req); 1834 1835 ceph_update_write_latency(&fsc->mdsc->metric, req->r_start_latency, 1836 req->r_end_latency, err); 1837 1838 out_put: 1839 ceph_osdc_put_request(req); 1840 if (err == -ECANCELED) 1841 err = 0; 1842 out: 1843 if (page && page != locked_page) { 1844 if (from_pagecache) { 1845 unlock_page(page); 1846 put_page(page); 1847 } else 1848 __free_pages(page, 0); 1849 } 1850 1851 dout("uninline_data %p %llx.%llx inline_version %llu = %d\n", 1852 inode, ceph_vinop(inode), inline_version, err); 1853 return err; 1854 } 1855 1856 static const struct vm_operations_struct ceph_vmops = { 1857 .fault = ceph_filemap_fault, 1858 .page_mkwrite = ceph_page_mkwrite, 1859 }; 1860 1861 int ceph_mmap(struct file *file, struct vm_area_struct *vma) 1862 { 1863 struct address_space *mapping = file->f_mapping; 1864 1865 if (!mapping->a_ops->readpage) 1866 return -ENOEXEC; 1867 file_accessed(file); 1868 vma->vm_ops = &ceph_vmops; 1869 return 0; 1870 } 1871 1872 enum { 1873 POOL_READ = 1, 1874 POOL_WRITE = 2, 1875 }; 1876 1877 static int __ceph_pool_perm_get(struct ceph_inode_info *ci, 1878 s64 pool, struct ceph_string *pool_ns) 1879 { 1880 struct ceph_fs_client *fsc = ceph_inode_to_client(&ci->vfs_inode); 1881 struct ceph_mds_client *mdsc = fsc->mdsc; 1882 struct ceph_osd_request *rd_req = NULL, *wr_req = NULL; 1883 struct rb_node **p, *parent; 1884 struct ceph_pool_perm *perm; 1885 struct page **pages; 1886 size_t pool_ns_len; 1887 int err = 0, err2 = 0, have = 0; 1888 1889 down_read(&mdsc->pool_perm_rwsem); 1890 p = &mdsc->pool_perm_tree.rb_node; 1891 while (*p) { 1892 perm = rb_entry(*p, struct ceph_pool_perm, node); 1893 if (pool < perm->pool) 1894 p = &(*p)->rb_left; 1895 else if (pool > perm->pool) 1896 p = &(*p)->rb_right; 1897 else { 1898 int ret = ceph_compare_string(pool_ns, 1899 perm->pool_ns, 1900 perm->pool_ns_len); 1901 if (ret < 0) 1902 p = &(*p)->rb_left; 1903 else if (ret > 0) 1904 p = &(*p)->rb_right; 1905 else { 1906 have = perm->perm; 1907 break; 1908 } 1909 } 1910 } 1911 up_read(&mdsc->pool_perm_rwsem); 1912 if (*p) 1913 goto out; 1914 1915 if (pool_ns) 1916 dout("__ceph_pool_perm_get pool %lld ns %.*s no perm cached\n", 1917 pool, (int)pool_ns->len, pool_ns->str); 1918 else 1919 dout("__ceph_pool_perm_get pool %lld no perm cached\n", pool); 1920 1921 down_write(&mdsc->pool_perm_rwsem); 1922 p = &mdsc->pool_perm_tree.rb_node; 1923 parent = NULL; 1924 while (*p) { 1925 parent = *p; 1926 perm = rb_entry(parent, struct ceph_pool_perm, node); 1927 if (pool < perm->pool) 1928 p = &(*p)->rb_left; 1929 else if (pool > perm->pool) 1930 p = &(*p)->rb_right; 1931 else { 1932 int ret = ceph_compare_string(pool_ns, 1933 perm->pool_ns, 1934 perm->pool_ns_len); 1935 if (ret < 0) 1936 p = &(*p)->rb_left; 1937 else if (ret > 0) 1938 p = &(*p)->rb_right; 1939 else { 1940 have = perm->perm; 1941 break; 1942 } 1943 } 1944 } 1945 if (*p) { 1946 up_write(&mdsc->pool_perm_rwsem); 1947 goto out; 1948 } 1949 1950 rd_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL, 1951 1, false, GFP_NOFS); 1952 if (!rd_req) { 1953 err = -ENOMEM; 1954 goto out_unlock; 1955 } 1956 1957 rd_req->r_flags = CEPH_OSD_FLAG_READ; 1958 osd_req_op_init(rd_req, 0, CEPH_OSD_OP_STAT, 0); 1959 rd_req->r_base_oloc.pool = pool; 1960 if (pool_ns) 1961 rd_req->r_base_oloc.pool_ns = ceph_get_string(pool_ns); 1962 ceph_oid_printf(&rd_req->r_base_oid, "%llx.00000000", ci->i_vino.ino); 1963 1964 err = ceph_osdc_alloc_messages(rd_req, GFP_NOFS); 1965 if (err) 1966 goto out_unlock; 1967 1968 wr_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL, 1969 1, false, GFP_NOFS); 1970 if (!wr_req) { 1971 err = -ENOMEM; 1972 goto out_unlock; 1973 } 1974 1975 wr_req->r_flags = CEPH_OSD_FLAG_WRITE; 1976 osd_req_op_init(wr_req, 0, CEPH_OSD_OP_CREATE, CEPH_OSD_OP_FLAG_EXCL); 1977 ceph_oloc_copy(&wr_req->r_base_oloc, &rd_req->r_base_oloc); 1978 ceph_oid_copy(&wr_req->r_base_oid, &rd_req->r_base_oid); 1979 1980 err = ceph_osdc_alloc_messages(wr_req, GFP_NOFS); 1981 if (err) 1982 goto out_unlock; 1983 1984 /* one page should be large enough for STAT data */ 1985 pages = ceph_alloc_page_vector(1, GFP_KERNEL); 1986 if (IS_ERR(pages)) { 1987 err = PTR_ERR(pages); 1988 goto out_unlock; 1989 } 1990 1991 osd_req_op_raw_data_in_pages(rd_req, 0, pages, PAGE_SIZE, 1992 0, false, true); 1993 err = ceph_osdc_start_request(&fsc->client->osdc, rd_req, false); 1994 1995 wr_req->r_mtime = ci->vfs_inode.i_mtime; 1996 err2 = ceph_osdc_start_request(&fsc->client->osdc, wr_req, false); 1997 1998 if (!err) 1999 err = ceph_osdc_wait_request(&fsc->client->osdc, rd_req); 2000 if (!err2) 2001 err2 = ceph_osdc_wait_request(&fsc->client->osdc, wr_req); 2002 2003 if (err >= 0 || err == -ENOENT) 2004 have |= POOL_READ; 2005 else if (err != -EPERM) { 2006 if (err == -EBLOCKLISTED) 2007 fsc->blocklisted = true; 2008 goto out_unlock; 2009 } 2010 2011 if (err2 == 0 || err2 == -EEXIST) 2012 have |= POOL_WRITE; 2013 else if (err2 != -EPERM) { 2014 if (err2 == -EBLOCKLISTED) 2015 fsc->blocklisted = true; 2016 err = err2; 2017 goto out_unlock; 2018 } 2019 2020 pool_ns_len = pool_ns ? pool_ns->len : 0; 2021 perm = kmalloc(sizeof(*perm) + pool_ns_len + 1, GFP_NOFS); 2022 if (!perm) { 2023 err = -ENOMEM; 2024 goto out_unlock; 2025 } 2026 2027 perm->pool = pool; 2028 perm->perm = have; 2029 perm->pool_ns_len = pool_ns_len; 2030 if (pool_ns_len > 0) 2031 memcpy(perm->pool_ns, pool_ns->str, pool_ns_len); 2032 perm->pool_ns[pool_ns_len] = 0; 2033 2034 rb_link_node(&perm->node, parent, p); 2035 rb_insert_color(&perm->node, &mdsc->pool_perm_tree); 2036 err = 0; 2037 out_unlock: 2038 up_write(&mdsc->pool_perm_rwsem); 2039 2040 ceph_osdc_put_request(rd_req); 2041 ceph_osdc_put_request(wr_req); 2042 out: 2043 if (!err) 2044 err = have; 2045 if (pool_ns) 2046 dout("__ceph_pool_perm_get pool %lld ns %.*s result = %d\n", 2047 pool, (int)pool_ns->len, pool_ns->str, err); 2048 else 2049 dout("__ceph_pool_perm_get pool %lld result = %d\n", pool, err); 2050 return err; 2051 } 2052 2053 int ceph_pool_perm_check(struct inode *inode, int need) 2054 { 2055 struct ceph_inode_info *ci = ceph_inode(inode); 2056 struct ceph_string *pool_ns; 2057 s64 pool; 2058 int ret, flags; 2059 2060 if (ci->i_vino.snap != CEPH_NOSNAP) { 2061 /* 2062 * Pool permission check needs to write to the first object. 2063 * But for snapshot, head of the first object may have alread 2064 * been deleted. Skip check to avoid creating orphan object. 2065 */ 2066 return 0; 2067 } 2068 2069 if (ceph_test_mount_opt(ceph_inode_to_client(inode), 2070 NOPOOLPERM)) 2071 return 0; 2072 2073 spin_lock(&ci->i_ceph_lock); 2074 flags = ci->i_ceph_flags; 2075 pool = ci->i_layout.pool_id; 2076 spin_unlock(&ci->i_ceph_lock); 2077 check: 2078 if (flags & CEPH_I_POOL_PERM) { 2079 if ((need & CEPH_CAP_FILE_RD) && !(flags & CEPH_I_POOL_RD)) { 2080 dout("ceph_pool_perm_check pool %lld no read perm\n", 2081 pool); 2082 return -EPERM; 2083 } 2084 if ((need & CEPH_CAP_FILE_WR) && !(flags & CEPH_I_POOL_WR)) { 2085 dout("ceph_pool_perm_check pool %lld no write perm\n", 2086 pool); 2087 return -EPERM; 2088 } 2089 return 0; 2090 } 2091 2092 pool_ns = ceph_try_get_string(ci->i_layout.pool_ns); 2093 ret = __ceph_pool_perm_get(ci, pool, pool_ns); 2094 ceph_put_string(pool_ns); 2095 if (ret < 0) 2096 return ret; 2097 2098 flags = CEPH_I_POOL_PERM; 2099 if (ret & POOL_READ) 2100 flags |= CEPH_I_POOL_RD; 2101 if (ret & POOL_WRITE) 2102 flags |= CEPH_I_POOL_WR; 2103 2104 spin_lock(&ci->i_ceph_lock); 2105 if (pool == ci->i_layout.pool_id && 2106 pool_ns == rcu_dereference_raw(ci->i_layout.pool_ns)) { 2107 ci->i_ceph_flags |= flags; 2108 } else { 2109 pool = ci->i_layout.pool_id; 2110 flags = ci->i_ceph_flags; 2111 } 2112 spin_unlock(&ci->i_ceph_lock); 2113 goto check; 2114 } 2115 2116 void ceph_pool_perm_destroy(struct ceph_mds_client *mdsc) 2117 { 2118 struct ceph_pool_perm *perm; 2119 struct rb_node *n; 2120 2121 while (!RB_EMPTY_ROOT(&mdsc->pool_perm_tree)) { 2122 n = rb_first(&mdsc->pool_perm_tree); 2123 perm = rb_entry(n, struct ceph_pool_perm, node); 2124 rb_erase(n, &mdsc->pool_perm_tree); 2125 kfree(perm); 2126 } 2127 } 2128