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 SetPageError(page); 245 ceph_fscache_readpage_cancel(inode, page); 246 if (err == -EBLOCKLISTED) 247 fsc->blocklisted = true; 248 goto out; 249 } 250 if (err < PAGE_SIZE) 251 /* zero fill remainder of page */ 252 zero_user_segment(page, err, PAGE_SIZE); 253 else 254 flush_dcache_page(page); 255 256 SetPageUptodate(page); 257 ceph_readpage_to_fscache(inode, page); 258 259 out: 260 return err < 0 ? err : 0; 261 } 262 263 static int ceph_readpage(struct file *filp, struct page *page) 264 { 265 int r = ceph_do_readpage(filp, page); 266 if (r != -EINPROGRESS) 267 unlock_page(page); 268 else 269 r = 0; 270 return r; 271 } 272 273 /* 274 * Finish an async read(ahead) op. 275 */ 276 static void finish_read(struct ceph_osd_request *req) 277 { 278 struct inode *inode = req->r_inode; 279 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 280 struct ceph_osd_data *osd_data; 281 int rc = req->r_result <= 0 ? req->r_result : 0; 282 int bytes = req->r_result >= 0 ? req->r_result : 0; 283 int num_pages; 284 int i; 285 286 dout("finish_read %p req %p rc %d bytes %d\n", inode, req, rc, bytes); 287 if (rc == -EBLOCKLISTED) 288 ceph_inode_to_client(inode)->blocklisted = true; 289 290 /* unlock all pages, zeroing any data we didn't read */ 291 osd_data = osd_req_op_extent_osd_data(req, 0); 292 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES); 293 num_pages = calc_pages_for((u64)osd_data->alignment, 294 (u64)osd_data->length); 295 for (i = 0; i < num_pages; i++) { 296 struct page *page = osd_data->pages[i]; 297 298 if (rc < 0 && rc != -ENOENT) { 299 ceph_fscache_readpage_cancel(inode, page); 300 goto unlock; 301 } 302 if (bytes < (int)PAGE_SIZE) { 303 /* zero (remainder of) page */ 304 int s = bytes < 0 ? 0 : bytes; 305 zero_user_segment(page, s, PAGE_SIZE); 306 } 307 dout("finish_read %p uptodate %p idx %lu\n", inode, page, 308 page->index); 309 flush_dcache_page(page); 310 SetPageUptodate(page); 311 ceph_readpage_to_fscache(inode, page); 312 unlock: 313 unlock_page(page); 314 put_page(page); 315 bytes -= PAGE_SIZE; 316 } 317 318 ceph_update_read_latency(&fsc->mdsc->metric, req->r_start_latency, 319 req->r_end_latency, rc); 320 321 kfree(osd_data->pages); 322 } 323 324 /* 325 * start an async read(ahead) operation. return nr_pages we submitted 326 * a read for on success, or negative error code. 327 */ 328 static int start_read(struct inode *inode, struct ceph_rw_context *rw_ctx, 329 struct list_head *page_list, int max) 330 { 331 struct ceph_osd_client *osdc = 332 &ceph_inode_to_client(inode)->client->osdc; 333 struct ceph_inode_info *ci = ceph_inode(inode); 334 struct page *page = lru_to_page(page_list); 335 struct ceph_vino vino; 336 struct ceph_osd_request *req; 337 u64 off; 338 u64 len; 339 int i; 340 struct page **pages; 341 pgoff_t next_index; 342 int nr_pages = 0; 343 int got = 0; 344 int ret = 0; 345 346 if (!rw_ctx) { 347 /* caller of readpages does not hold buffer and read caps 348 * (fadvise, madvise and readahead cases) */ 349 int want = CEPH_CAP_FILE_CACHE; 350 ret = ceph_try_get_caps(inode, CEPH_CAP_FILE_RD, want, 351 true, &got); 352 if (ret < 0) { 353 dout("start_read %p, error getting cap\n", inode); 354 } else if (!(got & want)) { 355 dout("start_read %p, no cache cap\n", inode); 356 ret = 0; 357 } 358 if (ret <= 0) { 359 if (got) 360 ceph_put_cap_refs(ci, got); 361 while (!list_empty(page_list)) { 362 page = lru_to_page(page_list); 363 list_del(&page->lru); 364 put_page(page); 365 } 366 return ret; 367 } 368 } 369 370 off = (u64) page_offset(page); 371 372 /* count pages */ 373 next_index = page->index; 374 list_for_each_entry_reverse(page, page_list, lru) { 375 if (page->index != next_index) 376 break; 377 nr_pages++; 378 next_index++; 379 if (max && nr_pages == max) 380 break; 381 } 382 len = nr_pages << PAGE_SHIFT; 383 dout("start_read %p nr_pages %d is %lld~%lld\n", inode, nr_pages, 384 off, len); 385 vino = ceph_vino(inode); 386 req = ceph_osdc_new_request(osdc, &ci->i_layout, vino, off, &len, 387 0, 1, CEPH_OSD_OP_READ, 388 CEPH_OSD_FLAG_READ, NULL, 389 ci->i_truncate_seq, ci->i_truncate_size, 390 false); 391 if (IS_ERR(req)) { 392 ret = PTR_ERR(req); 393 goto out; 394 } 395 396 /* build page vector */ 397 nr_pages = calc_pages_for(0, len); 398 pages = kmalloc_array(nr_pages, sizeof(*pages), GFP_KERNEL); 399 if (!pages) { 400 ret = -ENOMEM; 401 goto out_put; 402 } 403 for (i = 0; i < nr_pages; ++i) { 404 page = list_entry(page_list->prev, struct page, lru); 405 BUG_ON(PageLocked(page)); 406 list_del(&page->lru); 407 408 dout("start_read %p adding %p idx %lu\n", inode, page, 409 page->index); 410 if (add_to_page_cache_lru(page, &inode->i_data, page->index, 411 GFP_KERNEL)) { 412 ceph_fscache_uncache_page(inode, page); 413 put_page(page); 414 dout("start_read %p add_to_page_cache failed %p\n", 415 inode, page); 416 nr_pages = i; 417 if (nr_pages > 0) { 418 len = nr_pages << PAGE_SHIFT; 419 osd_req_op_extent_update(req, 0, len); 420 break; 421 } 422 goto out_pages; 423 } 424 pages[i] = page; 425 } 426 osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0, false, false); 427 req->r_callback = finish_read; 428 req->r_inode = inode; 429 430 dout("start_read %p starting %p %lld~%lld\n", inode, req, off, len); 431 ret = ceph_osdc_start_request(osdc, req, false); 432 if (ret < 0) 433 goto out_pages; 434 ceph_osdc_put_request(req); 435 436 /* After adding locked pages to page cache, the inode holds cache cap. 437 * So we can drop our cap refs. */ 438 if (got) 439 ceph_put_cap_refs(ci, got); 440 441 return nr_pages; 442 443 out_pages: 444 for (i = 0; i < nr_pages; ++i) { 445 ceph_fscache_readpage_cancel(inode, pages[i]); 446 unlock_page(pages[i]); 447 } 448 ceph_put_page_vector(pages, nr_pages, false); 449 out_put: 450 ceph_osdc_put_request(req); 451 out: 452 if (got) 453 ceph_put_cap_refs(ci, got); 454 return ret; 455 } 456 457 458 /* 459 * Read multiple pages. Leave pages we don't read + unlock in page_list; 460 * the caller (VM) cleans them up. 461 */ 462 static int ceph_readpages(struct file *file, struct address_space *mapping, 463 struct list_head *page_list, unsigned nr_pages) 464 { 465 struct inode *inode = file_inode(file); 466 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 467 struct ceph_file_info *fi = file->private_data; 468 struct ceph_rw_context *rw_ctx; 469 int rc = 0; 470 int max = 0; 471 472 if (ceph_inode(inode)->i_inline_version != CEPH_INLINE_NONE) 473 return -EINVAL; 474 475 rc = ceph_readpages_from_fscache(mapping->host, mapping, page_list, 476 &nr_pages); 477 478 if (rc == 0) 479 goto out; 480 481 rw_ctx = ceph_find_rw_context(fi); 482 max = fsc->mount_options->rsize >> PAGE_SHIFT; 483 dout("readpages %p file %p ctx %p nr_pages %d max %d\n", 484 inode, file, rw_ctx, nr_pages, max); 485 while (!list_empty(page_list)) { 486 rc = start_read(inode, rw_ctx, page_list, max); 487 if (rc < 0) 488 goto out; 489 } 490 out: 491 ceph_fscache_readpages_cancel(inode, page_list); 492 493 dout("readpages %p file %p ret %d\n", inode, file, rc); 494 return rc; 495 } 496 497 struct ceph_writeback_ctl 498 { 499 loff_t i_size; 500 u64 truncate_size; 501 u32 truncate_seq; 502 bool size_stable; 503 bool head_snapc; 504 }; 505 506 /* 507 * Get ref for the oldest snapc for an inode with dirty data... that is, the 508 * only snap context we are allowed to write back. 509 */ 510 static struct ceph_snap_context * 511 get_oldest_context(struct inode *inode, struct ceph_writeback_ctl *ctl, 512 struct ceph_snap_context *page_snapc) 513 { 514 struct ceph_inode_info *ci = ceph_inode(inode); 515 struct ceph_snap_context *snapc = NULL; 516 struct ceph_cap_snap *capsnap = NULL; 517 518 spin_lock(&ci->i_ceph_lock); 519 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) { 520 dout(" cap_snap %p snapc %p has %d dirty pages\n", capsnap, 521 capsnap->context, capsnap->dirty_pages); 522 if (!capsnap->dirty_pages) 523 continue; 524 525 /* get i_size, truncate_{seq,size} for page_snapc? */ 526 if (snapc && capsnap->context != page_snapc) 527 continue; 528 529 if (ctl) { 530 if (capsnap->writing) { 531 ctl->i_size = i_size_read(inode); 532 ctl->size_stable = false; 533 } else { 534 ctl->i_size = capsnap->size; 535 ctl->size_stable = true; 536 } 537 ctl->truncate_size = capsnap->truncate_size; 538 ctl->truncate_seq = capsnap->truncate_seq; 539 ctl->head_snapc = false; 540 } 541 542 if (snapc) 543 break; 544 545 snapc = ceph_get_snap_context(capsnap->context); 546 if (!page_snapc || 547 page_snapc == snapc || 548 page_snapc->seq > snapc->seq) 549 break; 550 } 551 if (!snapc && ci->i_wrbuffer_ref_head) { 552 snapc = ceph_get_snap_context(ci->i_head_snapc); 553 dout(" head snapc %p has %d dirty pages\n", 554 snapc, ci->i_wrbuffer_ref_head); 555 if (ctl) { 556 ctl->i_size = i_size_read(inode); 557 ctl->truncate_size = ci->i_truncate_size; 558 ctl->truncate_seq = ci->i_truncate_seq; 559 ctl->size_stable = false; 560 ctl->head_snapc = true; 561 } 562 } 563 spin_unlock(&ci->i_ceph_lock); 564 return snapc; 565 } 566 567 static u64 get_writepages_data_length(struct inode *inode, 568 struct page *page, u64 start) 569 { 570 struct ceph_inode_info *ci = ceph_inode(inode); 571 struct ceph_snap_context *snapc = page_snap_context(page); 572 struct ceph_cap_snap *capsnap = NULL; 573 u64 end = i_size_read(inode); 574 575 if (snapc != ci->i_head_snapc) { 576 bool found = false; 577 spin_lock(&ci->i_ceph_lock); 578 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) { 579 if (capsnap->context == snapc) { 580 if (!capsnap->writing) 581 end = capsnap->size; 582 found = true; 583 break; 584 } 585 } 586 spin_unlock(&ci->i_ceph_lock); 587 WARN_ON(!found); 588 } 589 if (end > page_offset(page) + PAGE_SIZE) 590 end = page_offset(page) + PAGE_SIZE; 591 return end > start ? end - start : 0; 592 } 593 594 /* 595 * Write a single page, but leave the page locked. 596 * 597 * If we get a write error, mark the mapping for error, but still adjust the 598 * dirty page accounting (i.e., page is no longer dirty). 599 */ 600 static int writepage_nounlock(struct page *page, struct writeback_control *wbc) 601 { 602 struct inode *inode = page->mapping->host; 603 struct ceph_inode_info *ci = ceph_inode(inode); 604 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 605 struct ceph_snap_context *snapc, *oldest; 606 loff_t page_off = page_offset(page); 607 int err; 608 loff_t len = PAGE_SIZE; 609 struct ceph_writeback_ctl ceph_wbc; 610 struct ceph_osd_client *osdc = &fsc->client->osdc; 611 struct ceph_osd_request *req; 612 613 dout("writepage %p idx %lu\n", page, page->index); 614 615 /* verify this is a writeable snap context */ 616 snapc = page_snap_context(page); 617 if (!snapc) { 618 dout("writepage %p page %p not dirty?\n", inode, page); 619 return 0; 620 } 621 oldest = get_oldest_context(inode, &ceph_wbc, snapc); 622 if (snapc->seq > oldest->seq) { 623 dout("writepage %p page %p snapc %p not writeable - noop\n", 624 inode, page, snapc); 625 /* we should only noop if called by kswapd */ 626 WARN_ON(!(current->flags & PF_MEMALLOC)); 627 ceph_put_snap_context(oldest); 628 redirty_page_for_writepage(wbc, page); 629 return 0; 630 } 631 ceph_put_snap_context(oldest); 632 633 /* is this a partial page at end of file? */ 634 if (page_off >= ceph_wbc.i_size) { 635 dout("%p page eof %llu\n", page, ceph_wbc.i_size); 636 page->mapping->a_ops->invalidatepage(page, 0, PAGE_SIZE); 637 return 0; 638 } 639 640 if (ceph_wbc.i_size < page_off + len) 641 len = ceph_wbc.i_size - page_off; 642 643 dout("writepage %p page %p index %lu on %llu~%llu snapc %p seq %lld\n", 644 inode, page, page->index, page_off, len, snapc, snapc->seq); 645 646 if (atomic_long_inc_return(&fsc->writeback_count) > 647 CONGESTION_ON_THRESH(fsc->mount_options->congestion_kb)) 648 set_bdi_congested(inode_to_bdi(inode), BLK_RW_ASYNC); 649 650 set_page_writeback(page); 651 req = ceph_osdc_new_request(osdc, &ci->i_layout, ceph_vino(inode), page_off, &len, 0, 1, 652 CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE, snapc, 653 ceph_wbc.truncate_seq, ceph_wbc.truncate_size, 654 true); 655 if (IS_ERR(req)) { 656 redirty_page_for_writepage(wbc, page); 657 end_page_writeback(page); 658 return PTR_ERR(req); 659 } 660 661 /* it may be a short write due to an object boundary */ 662 WARN_ON_ONCE(len > PAGE_SIZE); 663 osd_req_op_extent_osd_data_pages(req, 0, &page, len, 0, false, false); 664 dout("writepage %llu~%llu (%llu bytes)\n", page_off, len, len); 665 666 req->r_mtime = inode->i_mtime; 667 err = ceph_osdc_start_request(osdc, req, true); 668 if (!err) 669 err = ceph_osdc_wait_request(osdc, req); 670 671 ceph_update_write_latency(&fsc->mdsc->metric, req->r_start_latency, 672 req->r_end_latency, err); 673 674 ceph_osdc_put_request(req); 675 if (err == 0) 676 err = len; 677 678 if (err < 0) { 679 struct writeback_control tmp_wbc; 680 if (!wbc) 681 wbc = &tmp_wbc; 682 if (err == -ERESTARTSYS) { 683 /* killed by SIGKILL */ 684 dout("writepage interrupted page %p\n", page); 685 redirty_page_for_writepage(wbc, page); 686 end_page_writeback(page); 687 return err; 688 } 689 if (err == -EBLOCKLISTED) 690 fsc->blocklisted = true; 691 dout("writepage setting page/mapping error %d %p\n", 692 err, page); 693 mapping_set_error(&inode->i_data, err); 694 wbc->pages_skipped++; 695 } else { 696 dout("writepage cleaned page %p\n", page); 697 err = 0; /* vfs expects us to return 0 */ 698 } 699 page->private = 0; 700 ClearPagePrivate(page); 701 end_page_writeback(page); 702 ceph_put_wrbuffer_cap_refs(ci, 1, snapc); 703 ceph_put_snap_context(snapc); /* page's reference */ 704 705 if (atomic_long_dec_return(&fsc->writeback_count) < 706 CONGESTION_OFF_THRESH(fsc->mount_options->congestion_kb)) 707 clear_bdi_congested(inode_to_bdi(inode), BLK_RW_ASYNC); 708 709 return err; 710 } 711 712 static int ceph_writepage(struct page *page, struct writeback_control *wbc) 713 { 714 int err; 715 struct inode *inode = page->mapping->host; 716 BUG_ON(!inode); 717 ihold(inode); 718 err = writepage_nounlock(page, wbc); 719 if (err == -ERESTARTSYS) { 720 /* direct memory reclaimer was killed by SIGKILL. return 0 721 * to prevent caller from setting mapping/page error */ 722 err = 0; 723 } 724 unlock_page(page); 725 iput(inode); 726 return err; 727 } 728 729 /* 730 * async writeback completion handler. 731 * 732 * If we get an error, set the mapping error bit, but not the individual 733 * page error bits. 734 */ 735 static void writepages_finish(struct ceph_osd_request *req) 736 { 737 struct inode *inode = req->r_inode; 738 struct ceph_inode_info *ci = ceph_inode(inode); 739 struct ceph_osd_data *osd_data; 740 struct page *page; 741 int num_pages, total_pages = 0; 742 int i, j; 743 int rc = req->r_result; 744 struct ceph_snap_context *snapc = req->r_snapc; 745 struct address_space *mapping = inode->i_mapping; 746 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 747 bool remove_page; 748 749 dout("writepages_finish %p rc %d\n", inode, rc); 750 if (rc < 0) { 751 mapping_set_error(mapping, rc); 752 ceph_set_error_write(ci); 753 if (rc == -EBLOCKLISTED) 754 fsc->blocklisted = true; 755 } else { 756 ceph_clear_error_write(ci); 757 } 758 759 ceph_update_write_latency(&fsc->mdsc->metric, req->r_start_latency, 760 req->r_end_latency, rc); 761 762 /* 763 * We lost the cache cap, need to truncate the page before 764 * it is unlocked, otherwise we'd truncate it later in the 765 * page truncation thread, possibly losing some data that 766 * raced its way in 767 */ 768 remove_page = !(ceph_caps_issued(ci) & 769 (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)); 770 771 /* clean all pages */ 772 for (i = 0; i < req->r_num_ops; i++) { 773 if (req->r_ops[i].op != CEPH_OSD_OP_WRITE) 774 break; 775 776 osd_data = osd_req_op_extent_osd_data(req, i); 777 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES); 778 num_pages = calc_pages_for((u64)osd_data->alignment, 779 (u64)osd_data->length); 780 total_pages += num_pages; 781 for (j = 0; j < num_pages; j++) { 782 page = osd_data->pages[j]; 783 BUG_ON(!page); 784 WARN_ON(!PageUptodate(page)); 785 786 if (atomic_long_dec_return(&fsc->writeback_count) < 787 CONGESTION_OFF_THRESH( 788 fsc->mount_options->congestion_kb)) 789 clear_bdi_congested(inode_to_bdi(inode), 790 BLK_RW_ASYNC); 791 792 ceph_put_snap_context(page_snap_context(page)); 793 page->private = 0; 794 ClearPagePrivate(page); 795 dout("unlocking %p\n", page); 796 end_page_writeback(page); 797 798 if (remove_page) 799 generic_error_remove_page(inode->i_mapping, 800 page); 801 802 unlock_page(page); 803 } 804 dout("writepages_finish %p wrote %llu bytes cleaned %d pages\n", 805 inode, osd_data->length, rc >= 0 ? num_pages : 0); 806 807 release_pages(osd_data->pages, num_pages); 808 } 809 810 ceph_put_wrbuffer_cap_refs(ci, total_pages, snapc); 811 812 osd_data = osd_req_op_extent_osd_data(req, 0); 813 if (osd_data->pages_from_pool) 814 mempool_free(osd_data->pages, ceph_wb_pagevec_pool); 815 else 816 kfree(osd_data->pages); 817 ceph_osdc_put_request(req); 818 } 819 820 /* 821 * initiate async writeback 822 */ 823 static int ceph_writepages_start(struct address_space *mapping, 824 struct writeback_control *wbc) 825 { 826 struct inode *inode = mapping->host; 827 struct ceph_inode_info *ci = ceph_inode(inode); 828 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 829 struct ceph_vino vino = ceph_vino(inode); 830 pgoff_t index, start_index, end = -1; 831 struct ceph_snap_context *snapc = NULL, *last_snapc = NULL, *pgsnapc; 832 struct pagevec pvec; 833 int rc = 0; 834 unsigned int wsize = i_blocksize(inode); 835 struct ceph_osd_request *req = NULL; 836 struct ceph_writeback_ctl ceph_wbc; 837 bool should_loop, range_whole = false; 838 bool done = false; 839 840 dout("writepages_start %p (mode=%s)\n", inode, 841 wbc->sync_mode == WB_SYNC_NONE ? "NONE" : 842 (wbc->sync_mode == WB_SYNC_ALL ? "ALL" : "HOLD")); 843 844 if (READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) { 845 if (ci->i_wrbuffer_ref > 0) { 846 pr_warn_ratelimited( 847 "writepage_start %p %lld forced umount\n", 848 inode, ceph_ino(inode)); 849 } 850 mapping_set_error(mapping, -EIO); 851 return -EIO; /* we're in a forced umount, don't write! */ 852 } 853 if (fsc->mount_options->wsize < wsize) 854 wsize = fsc->mount_options->wsize; 855 856 pagevec_init(&pvec); 857 858 start_index = wbc->range_cyclic ? mapping->writeback_index : 0; 859 index = start_index; 860 861 retry: 862 /* find oldest snap context with dirty data */ 863 snapc = get_oldest_context(inode, &ceph_wbc, NULL); 864 if (!snapc) { 865 /* hmm, why does writepages get called when there 866 is no dirty data? */ 867 dout(" no snap context with dirty data?\n"); 868 goto out; 869 } 870 dout(" oldest snapc is %p seq %lld (%d snaps)\n", 871 snapc, snapc->seq, snapc->num_snaps); 872 873 should_loop = false; 874 if (ceph_wbc.head_snapc && snapc != last_snapc) { 875 /* where to start/end? */ 876 if (wbc->range_cyclic) { 877 index = start_index; 878 end = -1; 879 if (index > 0) 880 should_loop = true; 881 dout(" cyclic, start at %lu\n", index); 882 } else { 883 index = wbc->range_start >> PAGE_SHIFT; 884 end = wbc->range_end >> PAGE_SHIFT; 885 if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) 886 range_whole = true; 887 dout(" not cyclic, %lu to %lu\n", index, end); 888 } 889 } else if (!ceph_wbc.head_snapc) { 890 /* Do not respect wbc->range_{start,end}. Dirty pages 891 * in that range can be associated with newer snapc. 892 * They are not writeable until we write all dirty pages 893 * associated with 'snapc' get written */ 894 if (index > 0) 895 should_loop = true; 896 dout(" non-head snapc, range whole\n"); 897 } 898 899 ceph_put_snap_context(last_snapc); 900 last_snapc = snapc; 901 902 while (!done && index <= end) { 903 int num_ops = 0, op_idx; 904 unsigned i, pvec_pages, max_pages, locked_pages = 0; 905 struct page **pages = NULL, **data_pages; 906 struct page *page; 907 pgoff_t strip_unit_end = 0; 908 u64 offset = 0, len = 0; 909 bool from_pool = false; 910 911 max_pages = wsize >> PAGE_SHIFT; 912 913 get_more_pages: 914 pvec_pages = pagevec_lookup_range_tag(&pvec, mapping, &index, 915 end, PAGECACHE_TAG_DIRTY); 916 dout("pagevec_lookup_range_tag got %d\n", pvec_pages); 917 if (!pvec_pages && !locked_pages) 918 break; 919 for (i = 0; i < pvec_pages && locked_pages < max_pages; i++) { 920 page = pvec.pages[i]; 921 dout("? %p idx %lu\n", page, page->index); 922 if (locked_pages == 0) 923 lock_page(page); /* first page */ 924 else if (!trylock_page(page)) 925 break; 926 927 /* only dirty pages, or our accounting breaks */ 928 if (unlikely(!PageDirty(page)) || 929 unlikely(page->mapping != mapping)) { 930 dout("!dirty or !mapping %p\n", page); 931 unlock_page(page); 932 continue; 933 } 934 /* only if matching snap context */ 935 pgsnapc = page_snap_context(page); 936 if (pgsnapc != snapc) { 937 dout("page snapc %p %lld != oldest %p %lld\n", 938 pgsnapc, pgsnapc->seq, snapc, snapc->seq); 939 if (!should_loop && 940 !ceph_wbc.head_snapc && 941 wbc->sync_mode != WB_SYNC_NONE) 942 should_loop = true; 943 unlock_page(page); 944 continue; 945 } 946 if (page_offset(page) >= ceph_wbc.i_size) { 947 dout("%p page eof %llu\n", 948 page, ceph_wbc.i_size); 949 if ((ceph_wbc.size_stable || 950 page_offset(page) >= i_size_read(inode)) && 951 clear_page_dirty_for_io(page)) 952 mapping->a_ops->invalidatepage(page, 953 0, PAGE_SIZE); 954 unlock_page(page); 955 continue; 956 } 957 if (strip_unit_end && (page->index > strip_unit_end)) { 958 dout("end of strip unit %p\n", page); 959 unlock_page(page); 960 break; 961 } 962 if (PageWriteback(page)) { 963 if (wbc->sync_mode == WB_SYNC_NONE) { 964 dout("%p under writeback\n", page); 965 unlock_page(page); 966 continue; 967 } 968 dout("waiting on writeback %p\n", page); 969 wait_on_page_writeback(page); 970 } 971 972 if (!clear_page_dirty_for_io(page)) { 973 dout("%p !clear_page_dirty_for_io\n", page); 974 unlock_page(page); 975 continue; 976 } 977 978 /* 979 * We have something to write. If this is 980 * the first locked page this time through, 981 * calculate max possinle write size and 982 * allocate a page array 983 */ 984 if (locked_pages == 0) { 985 u64 objnum; 986 u64 objoff; 987 u32 xlen; 988 989 /* prepare async write request */ 990 offset = (u64)page_offset(page); 991 ceph_calc_file_object_mapping(&ci->i_layout, 992 offset, wsize, 993 &objnum, &objoff, 994 &xlen); 995 len = xlen; 996 997 num_ops = 1; 998 strip_unit_end = page->index + 999 ((len - 1) >> PAGE_SHIFT); 1000 1001 BUG_ON(pages); 1002 max_pages = calc_pages_for(0, (u64)len); 1003 pages = kmalloc_array(max_pages, 1004 sizeof(*pages), 1005 GFP_NOFS); 1006 if (!pages) { 1007 from_pool = true; 1008 pages = mempool_alloc(ceph_wb_pagevec_pool, GFP_NOFS); 1009 BUG_ON(!pages); 1010 } 1011 1012 len = 0; 1013 } else if (page->index != 1014 (offset + len) >> PAGE_SHIFT) { 1015 if (num_ops >= (from_pool ? CEPH_OSD_SLAB_OPS : 1016 CEPH_OSD_MAX_OPS)) { 1017 redirty_page_for_writepage(wbc, page); 1018 unlock_page(page); 1019 break; 1020 } 1021 1022 num_ops++; 1023 offset = (u64)page_offset(page); 1024 len = 0; 1025 } 1026 1027 /* note position of first page in pvec */ 1028 dout("%p will write page %p idx %lu\n", 1029 inode, page, page->index); 1030 1031 if (atomic_long_inc_return(&fsc->writeback_count) > 1032 CONGESTION_ON_THRESH( 1033 fsc->mount_options->congestion_kb)) { 1034 set_bdi_congested(inode_to_bdi(inode), 1035 BLK_RW_ASYNC); 1036 } 1037 1038 1039 pages[locked_pages++] = page; 1040 pvec.pages[i] = NULL; 1041 1042 len += PAGE_SIZE; 1043 } 1044 1045 /* did we get anything? */ 1046 if (!locked_pages) 1047 goto release_pvec_pages; 1048 if (i) { 1049 unsigned j, n = 0; 1050 /* shift unused page to beginning of pvec */ 1051 for (j = 0; j < pvec_pages; j++) { 1052 if (!pvec.pages[j]) 1053 continue; 1054 if (n < j) 1055 pvec.pages[n] = pvec.pages[j]; 1056 n++; 1057 } 1058 pvec.nr = n; 1059 1060 if (pvec_pages && i == pvec_pages && 1061 locked_pages < max_pages) { 1062 dout("reached end pvec, trying for more\n"); 1063 pagevec_release(&pvec); 1064 goto get_more_pages; 1065 } 1066 } 1067 1068 new_request: 1069 offset = page_offset(pages[0]); 1070 len = wsize; 1071 1072 req = ceph_osdc_new_request(&fsc->client->osdc, 1073 &ci->i_layout, vino, 1074 offset, &len, 0, num_ops, 1075 CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE, 1076 snapc, ceph_wbc.truncate_seq, 1077 ceph_wbc.truncate_size, false); 1078 if (IS_ERR(req)) { 1079 req = ceph_osdc_new_request(&fsc->client->osdc, 1080 &ci->i_layout, vino, 1081 offset, &len, 0, 1082 min(num_ops, 1083 CEPH_OSD_SLAB_OPS), 1084 CEPH_OSD_OP_WRITE, 1085 CEPH_OSD_FLAG_WRITE, 1086 snapc, ceph_wbc.truncate_seq, 1087 ceph_wbc.truncate_size, true); 1088 BUG_ON(IS_ERR(req)); 1089 } 1090 BUG_ON(len < page_offset(pages[locked_pages - 1]) + 1091 PAGE_SIZE - offset); 1092 1093 req->r_callback = writepages_finish; 1094 req->r_inode = inode; 1095 1096 /* Format the osd request message and submit the write */ 1097 len = 0; 1098 data_pages = pages; 1099 op_idx = 0; 1100 for (i = 0; i < locked_pages; i++) { 1101 u64 cur_offset = page_offset(pages[i]); 1102 if (offset + len != cur_offset) { 1103 if (op_idx + 1 == req->r_num_ops) 1104 break; 1105 osd_req_op_extent_dup_last(req, op_idx, 1106 cur_offset - offset); 1107 dout("writepages got pages at %llu~%llu\n", 1108 offset, len); 1109 osd_req_op_extent_osd_data_pages(req, op_idx, 1110 data_pages, len, 0, 1111 from_pool, false); 1112 osd_req_op_extent_update(req, op_idx, len); 1113 1114 len = 0; 1115 offset = cur_offset; 1116 data_pages = pages + i; 1117 op_idx++; 1118 } 1119 1120 set_page_writeback(pages[i]); 1121 len += PAGE_SIZE; 1122 } 1123 1124 if (ceph_wbc.size_stable) { 1125 len = min(len, ceph_wbc.i_size - offset); 1126 } else if (i == locked_pages) { 1127 /* writepages_finish() clears writeback pages 1128 * according to the data length, so make sure 1129 * data length covers all locked pages */ 1130 u64 min_len = len + 1 - PAGE_SIZE; 1131 len = get_writepages_data_length(inode, pages[i - 1], 1132 offset); 1133 len = max(len, min_len); 1134 } 1135 dout("writepages got pages at %llu~%llu\n", offset, len); 1136 1137 osd_req_op_extent_osd_data_pages(req, op_idx, data_pages, len, 1138 0, from_pool, false); 1139 osd_req_op_extent_update(req, op_idx, len); 1140 1141 BUG_ON(op_idx + 1 != req->r_num_ops); 1142 1143 from_pool = false; 1144 if (i < locked_pages) { 1145 BUG_ON(num_ops <= req->r_num_ops); 1146 num_ops -= req->r_num_ops; 1147 locked_pages -= i; 1148 1149 /* allocate new pages array for next request */ 1150 data_pages = pages; 1151 pages = kmalloc_array(locked_pages, sizeof(*pages), 1152 GFP_NOFS); 1153 if (!pages) { 1154 from_pool = true; 1155 pages = mempool_alloc(ceph_wb_pagevec_pool, GFP_NOFS); 1156 BUG_ON(!pages); 1157 } 1158 memcpy(pages, data_pages + i, 1159 locked_pages * sizeof(*pages)); 1160 memset(data_pages + i, 0, 1161 locked_pages * sizeof(*pages)); 1162 } else { 1163 BUG_ON(num_ops != req->r_num_ops); 1164 index = pages[i - 1]->index + 1; 1165 /* request message now owns the pages array */ 1166 pages = NULL; 1167 } 1168 1169 req->r_mtime = inode->i_mtime; 1170 rc = ceph_osdc_start_request(&fsc->client->osdc, req, true); 1171 BUG_ON(rc); 1172 req = NULL; 1173 1174 wbc->nr_to_write -= i; 1175 if (pages) 1176 goto new_request; 1177 1178 /* 1179 * We stop writing back only if we are not doing 1180 * integrity sync. In case of integrity sync we have to 1181 * keep going until we have written all the pages 1182 * we tagged for writeback prior to entering this loop. 1183 */ 1184 if (wbc->nr_to_write <= 0 && wbc->sync_mode == WB_SYNC_NONE) 1185 done = true; 1186 1187 release_pvec_pages: 1188 dout("pagevec_release on %d pages (%p)\n", (int)pvec.nr, 1189 pvec.nr ? pvec.pages[0] : NULL); 1190 pagevec_release(&pvec); 1191 } 1192 1193 if (should_loop && !done) { 1194 /* more to do; loop back to beginning of file */ 1195 dout("writepages looping back to beginning of file\n"); 1196 end = start_index - 1; /* OK even when start_index == 0 */ 1197 1198 /* to write dirty pages associated with next snapc, 1199 * we need to wait until current writes complete */ 1200 if (wbc->sync_mode != WB_SYNC_NONE && 1201 start_index == 0 && /* all dirty pages were checked */ 1202 !ceph_wbc.head_snapc) { 1203 struct page *page; 1204 unsigned i, nr; 1205 index = 0; 1206 while ((index <= end) && 1207 (nr = pagevec_lookup_tag(&pvec, mapping, &index, 1208 PAGECACHE_TAG_WRITEBACK))) { 1209 for (i = 0; i < nr; i++) { 1210 page = pvec.pages[i]; 1211 if (page_snap_context(page) != snapc) 1212 continue; 1213 wait_on_page_writeback(page); 1214 } 1215 pagevec_release(&pvec); 1216 cond_resched(); 1217 } 1218 } 1219 1220 start_index = 0; 1221 index = 0; 1222 goto retry; 1223 } 1224 1225 if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) 1226 mapping->writeback_index = index; 1227 1228 out: 1229 ceph_osdc_put_request(req); 1230 ceph_put_snap_context(last_snapc); 1231 dout("writepages dend - startone, rc = %d\n", rc); 1232 return rc; 1233 } 1234 1235 1236 1237 /* 1238 * See if a given @snapc is either writeable, or already written. 1239 */ 1240 static int context_is_writeable_or_written(struct inode *inode, 1241 struct ceph_snap_context *snapc) 1242 { 1243 struct ceph_snap_context *oldest = get_oldest_context(inode, NULL, NULL); 1244 int ret = !oldest || snapc->seq <= oldest->seq; 1245 1246 ceph_put_snap_context(oldest); 1247 return ret; 1248 } 1249 1250 /** 1251 * ceph_find_incompatible - find an incompatible context and return it 1252 * @page: page being dirtied 1253 * 1254 * We are only allowed to write into/dirty a page if the page is 1255 * clean, or already dirty within the same snap context. Returns a 1256 * conflicting context if there is one, NULL if there isn't, or a 1257 * negative error code on other errors. 1258 * 1259 * Must be called with page lock held. 1260 */ 1261 static struct ceph_snap_context * 1262 ceph_find_incompatible(struct page *page) 1263 { 1264 struct inode *inode = page->mapping->host; 1265 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 1266 struct ceph_inode_info *ci = ceph_inode(inode); 1267 1268 if (READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) { 1269 dout(" page %p forced umount\n", page); 1270 return ERR_PTR(-EIO); 1271 } 1272 1273 for (;;) { 1274 struct ceph_snap_context *snapc, *oldest; 1275 1276 wait_on_page_writeback(page); 1277 1278 snapc = page_snap_context(page); 1279 if (!snapc || snapc == ci->i_head_snapc) 1280 break; 1281 1282 /* 1283 * this page is already dirty in another (older) snap 1284 * context! is it writeable now? 1285 */ 1286 oldest = get_oldest_context(inode, NULL, NULL); 1287 if (snapc->seq > oldest->seq) { 1288 /* not writeable -- return it for the caller to deal with */ 1289 ceph_put_snap_context(oldest); 1290 dout(" page %p snapc %p not current or oldest\n", page, snapc); 1291 return ceph_get_snap_context(snapc); 1292 } 1293 ceph_put_snap_context(oldest); 1294 1295 /* yay, writeable, do it now (without dropping page lock) */ 1296 dout(" page %p snapc %p not current, but oldest\n", page, snapc); 1297 if (clear_page_dirty_for_io(page)) { 1298 int r = writepage_nounlock(page, NULL); 1299 if (r < 0) 1300 return ERR_PTR(r); 1301 } 1302 } 1303 return NULL; 1304 } 1305 1306 /* 1307 * We are only allowed to write into/dirty the page if the page is 1308 * clean, or already dirty within the same snap context. 1309 * 1310 * called with page locked. 1311 * return success with page locked, 1312 * or any failure (incl -EAGAIN) with page unlocked. 1313 */ 1314 static int ceph_update_writeable_page(struct file *file, 1315 loff_t pos, unsigned len, 1316 struct page *page) 1317 { 1318 struct inode *inode = file_inode(file); 1319 struct ceph_inode_info *ci = ceph_inode(inode); 1320 struct ceph_snap_context *snapc; 1321 loff_t page_off = pos & PAGE_MASK; 1322 int pos_in_page = pos & ~PAGE_MASK; 1323 int end_in_page = pos_in_page + len; 1324 loff_t i_size; 1325 int r; 1326 1327 retry_locked: 1328 snapc = ceph_find_incompatible(page); 1329 if (snapc) { 1330 if (IS_ERR(snapc)) { 1331 r = PTR_ERR(snapc); 1332 goto fail_unlock; 1333 } 1334 unlock_page(page); 1335 ceph_queue_writeback(inode); 1336 r = wait_event_killable(ci->i_cap_wq, 1337 context_is_writeable_or_written(inode, snapc)); 1338 ceph_put_snap_context(snapc); 1339 return -EAGAIN; 1340 } 1341 1342 if (PageUptodate(page)) { 1343 dout(" page %p already uptodate\n", page); 1344 return 0; 1345 } 1346 1347 /* full page? */ 1348 if (pos_in_page == 0 && len == PAGE_SIZE) 1349 return 0; 1350 1351 /* past end of file? */ 1352 i_size = i_size_read(inode); 1353 1354 if (page_off >= i_size || 1355 (pos_in_page == 0 && (pos+len) >= i_size && 1356 end_in_page - pos_in_page != PAGE_SIZE)) { 1357 dout(" zeroing %p 0 - %d and %d - %d\n", 1358 page, pos_in_page, end_in_page, (int)PAGE_SIZE); 1359 zero_user_segments(page, 1360 0, pos_in_page, 1361 end_in_page, PAGE_SIZE); 1362 return 0; 1363 } 1364 1365 /* we need to read it. */ 1366 r = ceph_do_readpage(file, page); 1367 if (r < 0) { 1368 if (r == -EINPROGRESS) 1369 return -EAGAIN; 1370 goto fail_unlock; 1371 } 1372 goto retry_locked; 1373 fail_unlock: 1374 unlock_page(page); 1375 return r; 1376 } 1377 1378 /* 1379 * We are only allowed to write into/dirty the page if the page is 1380 * clean, or already dirty within the same snap context. 1381 */ 1382 static int ceph_write_begin(struct file *file, struct address_space *mapping, 1383 loff_t pos, unsigned len, unsigned flags, 1384 struct page **pagep, void **fsdata) 1385 { 1386 struct inode *inode = file_inode(file); 1387 struct page *page; 1388 pgoff_t index = pos >> PAGE_SHIFT; 1389 int r; 1390 1391 do { 1392 /* get a page */ 1393 page = grab_cache_page_write_begin(mapping, index, 0); 1394 if (!page) 1395 return -ENOMEM; 1396 1397 dout("write_begin file %p inode %p page %p %d~%d\n", file, 1398 inode, page, (int)pos, (int)len); 1399 1400 r = ceph_update_writeable_page(file, pos, len, page); 1401 if (r < 0) 1402 put_page(page); 1403 else 1404 *pagep = page; 1405 } while (r == -EAGAIN); 1406 1407 return r; 1408 } 1409 1410 /* 1411 * we don't do anything in here that simple_write_end doesn't do 1412 * except adjust dirty page accounting 1413 */ 1414 static int ceph_write_end(struct file *file, struct address_space *mapping, 1415 loff_t pos, unsigned len, unsigned copied, 1416 struct page *page, void *fsdata) 1417 { 1418 struct inode *inode = file_inode(file); 1419 bool check_cap = false; 1420 1421 dout("write_end file %p inode %p page %p %d~%d (%d)\n", file, 1422 inode, page, (int)pos, (int)copied, (int)len); 1423 1424 /* zero the stale part of the page if we did a short copy */ 1425 if (!PageUptodate(page)) { 1426 if (copied < len) { 1427 copied = 0; 1428 goto out; 1429 } 1430 SetPageUptodate(page); 1431 } 1432 1433 /* did file size increase? */ 1434 if (pos+copied > i_size_read(inode)) 1435 check_cap = ceph_inode_set_size(inode, pos+copied); 1436 1437 set_page_dirty(page); 1438 1439 out: 1440 unlock_page(page); 1441 put_page(page); 1442 1443 if (check_cap) 1444 ceph_check_caps(ceph_inode(inode), CHECK_CAPS_AUTHONLY, NULL); 1445 1446 return copied; 1447 } 1448 1449 /* 1450 * we set .direct_IO to indicate direct io is supported, but since we 1451 * intercept O_DIRECT reads and writes early, this function should 1452 * never get called. 1453 */ 1454 static ssize_t ceph_direct_io(struct kiocb *iocb, struct iov_iter *iter) 1455 { 1456 WARN_ON(1); 1457 return -EINVAL; 1458 } 1459 1460 const struct address_space_operations ceph_aops = { 1461 .readpage = ceph_readpage, 1462 .readpages = ceph_readpages, 1463 .writepage = ceph_writepage, 1464 .writepages = ceph_writepages_start, 1465 .write_begin = ceph_write_begin, 1466 .write_end = ceph_write_end, 1467 .set_page_dirty = ceph_set_page_dirty, 1468 .invalidatepage = ceph_invalidatepage, 1469 .releasepage = ceph_releasepage, 1470 .direct_IO = ceph_direct_io, 1471 }; 1472 1473 static void ceph_block_sigs(sigset_t *oldset) 1474 { 1475 sigset_t mask; 1476 siginitsetinv(&mask, sigmask(SIGKILL)); 1477 sigprocmask(SIG_BLOCK, &mask, oldset); 1478 } 1479 1480 static void ceph_restore_sigs(sigset_t *oldset) 1481 { 1482 sigprocmask(SIG_SETMASK, oldset, NULL); 1483 } 1484 1485 /* 1486 * vm ops 1487 */ 1488 static vm_fault_t ceph_filemap_fault(struct vm_fault *vmf) 1489 { 1490 struct vm_area_struct *vma = vmf->vma; 1491 struct inode *inode = file_inode(vma->vm_file); 1492 struct ceph_inode_info *ci = ceph_inode(inode); 1493 struct ceph_file_info *fi = vma->vm_file->private_data; 1494 struct page *pinned_page = NULL; 1495 loff_t off = vmf->pgoff << PAGE_SHIFT; 1496 int want, got, err; 1497 sigset_t oldset; 1498 vm_fault_t ret = VM_FAULT_SIGBUS; 1499 1500 ceph_block_sigs(&oldset); 1501 1502 dout("filemap_fault %p %llx.%llx %llu~%zd trying to get caps\n", 1503 inode, ceph_vinop(inode), off, (size_t)PAGE_SIZE); 1504 if (fi->fmode & CEPH_FILE_MODE_LAZY) 1505 want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO; 1506 else 1507 want = CEPH_CAP_FILE_CACHE; 1508 1509 got = 0; 1510 err = ceph_get_caps(vma->vm_file, CEPH_CAP_FILE_RD, want, -1, 1511 &got, &pinned_page); 1512 if (err < 0) 1513 goto out_restore; 1514 1515 dout("filemap_fault %p %llu~%zd got cap refs on %s\n", 1516 inode, off, (size_t)PAGE_SIZE, ceph_cap_string(got)); 1517 1518 if ((got & (CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO)) || 1519 ci->i_inline_version == CEPH_INLINE_NONE) { 1520 CEPH_DEFINE_RW_CONTEXT(rw_ctx, got); 1521 ceph_add_rw_context(fi, &rw_ctx); 1522 ret = filemap_fault(vmf); 1523 ceph_del_rw_context(fi, &rw_ctx); 1524 dout("filemap_fault %p %llu~%zd drop cap refs %s ret %x\n", 1525 inode, off, (size_t)PAGE_SIZE, 1526 ceph_cap_string(got), ret); 1527 } else 1528 err = -EAGAIN; 1529 1530 if (pinned_page) 1531 put_page(pinned_page); 1532 ceph_put_cap_refs(ci, got); 1533 1534 if (err != -EAGAIN) 1535 goto out_restore; 1536 1537 /* read inline data */ 1538 if (off >= PAGE_SIZE) { 1539 /* does not support inline data > PAGE_SIZE */ 1540 ret = VM_FAULT_SIGBUS; 1541 } else { 1542 struct address_space *mapping = inode->i_mapping; 1543 struct page *page = find_or_create_page(mapping, 0, 1544 mapping_gfp_constraint(mapping, 1545 ~__GFP_FS)); 1546 if (!page) { 1547 ret = VM_FAULT_OOM; 1548 goto out_inline; 1549 } 1550 err = __ceph_do_getattr(inode, page, 1551 CEPH_STAT_CAP_INLINE_DATA, true); 1552 if (err < 0 || off >= i_size_read(inode)) { 1553 unlock_page(page); 1554 put_page(page); 1555 ret = vmf_error(err); 1556 goto out_inline; 1557 } 1558 if (err < PAGE_SIZE) 1559 zero_user_segment(page, err, PAGE_SIZE); 1560 else 1561 flush_dcache_page(page); 1562 SetPageUptodate(page); 1563 vmf->page = page; 1564 ret = VM_FAULT_MAJOR | VM_FAULT_LOCKED; 1565 out_inline: 1566 dout("filemap_fault %p %llu~%zd read inline data ret %x\n", 1567 inode, off, (size_t)PAGE_SIZE, ret); 1568 } 1569 out_restore: 1570 ceph_restore_sigs(&oldset); 1571 if (err < 0) 1572 ret = vmf_error(err); 1573 1574 return ret; 1575 } 1576 1577 /* 1578 * Reuse write_begin here for simplicity. 1579 */ 1580 static vm_fault_t ceph_page_mkwrite(struct vm_fault *vmf) 1581 { 1582 struct vm_area_struct *vma = vmf->vma; 1583 struct inode *inode = file_inode(vma->vm_file); 1584 struct ceph_inode_info *ci = ceph_inode(inode); 1585 struct ceph_file_info *fi = vma->vm_file->private_data; 1586 struct ceph_cap_flush *prealloc_cf; 1587 struct page *page = vmf->page; 1588 loff_t off = page_offset(page); 1589 loff_t size = i_size_read(inode); 1590 size_t len; 1591 int want, got, err; 1592 sigset_t oldset; 1593 vm_fault_t ret = VM_FAULT_SIGBUS; 1594 1595 prealloc_cf = ceph_alloc_cap_flush(); 1596 if (!prealloc_cf) 1597 return VM_FAULT_OOM; 1598 1599 sb_start_pagefault(inode->i_sb); 1600 ceph_block_sigs(&oldset); 1601 1602 if (ci->i_inline_version != CEPH_INLINE_NONE) { 1603 struct page *locked_page = NULL; 1604 if (off == 0) { 1605 lock_page(page); 1606 locked_page = page; 1607 } 1608 err = ceph_uninline_data(vma->vm_file, locked_page); 1609 if (locked_page) 1610 unlock_page(locked_page); 1611 if (err < 0) 1612 goto out_free; 1613 } 1614 1615 if (off + PAGE_SIZE <= size) 1616 len = PAGE_SIZE; 1617 else 1618 len = size & ~PAGE_MASK; 1619 1620 dout("page_mkwrite %p %llx.%llx %llu~%zd getting caps i_size %llu\n", 1621 inode, ceph_vinop(inode), off, len, size); 1622 if (fi->fmode & CEPH_FILE_MODE_LAZY) 1623 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO; 1624 else 1625 want = CEPH_CAP_FILE_BUFFER; 1626 1627 got = 0; 1628 err = ceph_get_caps(vma->vm_file, CEPH_CAP_FILE_WR, want, off + len, 1629 &got, NULL); 1630 if (err < 0) 1631 goto out_free; 1632 1633 dout("page_mkwrite %p %llu~%zd got cap refs on %s\n", 1634 inode, off, len, ceph_cap_string(got)); 1635 1636 /* Update time before taking page lock */ 1637 file_update_time(vma->vm_file); 1638 inode_inc_iversion_raw(inode); 1639 1640 do { 1641 struct ceph_snap_context *snapc; 1642 1643 lock_page(page); 1644 1645 if (page_mkwrite_check_truncate(page, inode) < 0) { 1646 unlock_page(page); 1647 ret = VM_FAULT_NOPAGE; 1648 break; 1649 } 1650 1651 snapc = ceph_find_incompatible(page); 1652 if (!snapc) { 1653 /* success. we'll keep the page locked. */ 1654 set_page_dirty(page); 1655 ret = VM_FAULT_LOCKED; 1656 break; 1657 } 1658 1659 unlock_page(page); 1660 1661 if (IS_ERR(snapc)) { 1662 ret = VM_FAULT_SIGBUS; 1663 break; 1664 } 1665 1666 ceph_queue_writeback(inode); 1667 err = wait_event_killable(ci->i_cap_wq, 1668 context_is_writeable_or_written(inode, snapc)); 1669 ceph_put_snap_context(snapc); 1670 } while (err == 0); 1671 1672 if (ret == VM_FAULT_LOCKED || 1673 ci->i_inline_version != CEPH_INLINE_NONE) { 1674 int dirty; 1675 spin_lock(&ci->i_ceph_lock); 1676 ci->i_inline_version = CEPH_INLINE_NONE; 1677 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR, 1678 &prealloc_cf); 1679 spin_unlock(&ci->i_ceph_lock); 1680 if (dirty) 1681 __mark_inode_dirty(inode, dirty); 1682 } 1683 1684 dout("page_mkwrite %p %llu~%zd dropping cap refs on %s ret %x\n", 1685 inode, off, len, ceph_cap_string(got), ret); 1686 ceph_put_cap_refs(ci, got); 1687 out_free: 1688 ceph_restore_sigs(&oldset); 1689 sb_end_pagefault(inode->i_sb); 1690 ceph_free_cap_flush(prealloc_cf); 1691 if (err < 0) 1692 ret = vmf_error(err); 1693 return ret; 1694 } 1695 1696 void ceph_fill_inline_data(struct inode *inode, struct page *locked_page, 1697 char *data, size_t len) 1698 { 1699 struct address_space *mapping = inode->i_mapping; 1700 struct page *page; 1701 1702 if (locked_page) { 1703 page = locked_page; 1704 } else { 1705 if (i_size_read(inode) == 0) 1706 return; 1707 page = find_or_create_page(mapping, 0, 1708 mapping_gfp_constraint(mapping, 1709 ~__GFP_FS)); 1710 if (!page) 1711 return; 1712 if (PageUptodate(page)) { 1713 unlock_page(page); 1714 put_page(page); 1715 return; 1716 } 1717 } 1718 1719 dout("fill_inline_data %p %llx.%llx len %zu locked_page %p\n", 1720 inode, ceph_vinop(inode), len, locked_page); 1721 1722 if (len > 0) { 1723 void *kaddr = kmap_atomic(page); 1724 memcpy(kaddr, data, len); 1725 kunmap_atomic(kaddr); 1726 } 1727 1728 if (page != locked_page) { 1729 if (len < PAGE_SIZE) 1730 zero_user_segment(page, len, PAGE_SIZE); 1731 else 1732 flush_dcache_page(page); 1733 1734 SetPageUptodate(page); 1735 unlock_page(page); 1736 put_page(page); 1737 } 1738 } 1739 1740 int ceph_uninline_data(struct file *filp, struct page *locked_page) 1741 { 1742 struct inode *inode = file_inode(filp); 1743 struct ceph_inode_info *ci = ceph_inode(inode); 1744 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 1745 struct ceph_osd_request *req; 1746 struct page *page = NULL; 1747 u64 len, inline_version; 1748 int err = 0; 1749 bool from_pagecache = false; 1750 1751 spin_lock(&ci->i_ceph_lock); 1752 inline_version = ci->i_inline_version; 1753 spin_unlock(&ci->i_ceph_lock); 1754 1755 dout("uninline_data %p %llx.%llx inline_version %llu\n", 1756 inode, ceph_vinop(inode), inline_version); 1757 1758 if (inline_version == 1 || /* initial version, no data */ 1759 inline_version == CEPH_INLINE_NONE) 1760 goto out; 1761 1762 if (locked_page) { 1763 page = locked_page; 1764 WARN_ON(!PageUptodate(page)); 1765 } else if (ceph_caps_issued(ci) & 1766 (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) { 1767 page = find_get_page(inode->i_mapping, 0); 1768 if (page) { 1769 if (PageUptodate(page)) { 1770 from_pagecache = true; 1771 lock_page(page); 1772 } else { 1773 put_page(page); 1774 page = NULL; 1775 } 1776 } 1777 } 1778 1779 if (page) { 1780 len = i_size_read(inode); 1781 if (len > PAGE_SIZE) 1782 len = PAGE_SIZE; 1783 } else { 1784 page = __page_cache_alloc(GFP_NOFS); 1785 if (!page) { 1786 err = -ENOMEM; 1787 goto out; 1788 } 1789 err = __ceph_do_getattr(inode, page, 1790 CEPH_STAT_CAP_INLINE_DATA, true); 1791 if (err < 0) { 1792 /* no inline data */ 1793 if (err == -ENODATA) 1794 err = 0; 1795 goto out; 1796 } 1797 len = err; 1798 } 1799 1800 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, 1801 ceph_vino(inode), 0, &len, 0, 1, 1802 CEPH_OSD_OP_CREATE, CEPH_OSD_FLAG_WRITE, 1803 NULL, 0, 0, false); 1804 if (IS_ERR(req)) { 1805 err = PTR_ERR(req); 1806 goto out; 1807 } 1808 1809 req->r_mtime = inode->i_mtime; 1810 err = ceph_osdc_start_request(&fsc->client->osdc, req, false); 1811 if (!err) 1812 err = ceph_osdc_wait_request(&fsc->client->osdc, req); 1813 ceph_osdc_put_request(req); 1814 if (err < 0) 1815 goto out; 1816 1817 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, 1818 ceph_vino(inode), 0, &len, 1, 3, 1819 CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE, 1820 NULL, ci->i_truncate_seq, 1821 ci->i_truncate_size, false); 1822 if (IS_ERR(req)) { 1823 err = PTR_ERR(req); 1824 goto out; 1825 } 1826 1827 osd_req_op_extent_osd_data_pages(req, 1, &page, len, 0, false, false); 1828 1829 { 1830 __le64 xattr_buf = cpu_to_le64(inline_version); 1831 err = osd_req_op_xattr_init(req, 0, CEPH_OSD_OP_CMPXATTR, 1832 "inline_version", &xattr_buf, 1833 sizeof(xattr_buf), 1834 CEPH_OSD_CMPXATTR_OP_GT, 1835 CEPH_OSD_CMPXATTR_MODE_U64); 1836 if (err) 1837 goto out_put; 1838 } 1839 1840 { 1841 char xattr_buf[32]; 1842 int xattr_len = snprintf(xattr_buf, sizeof(xattr_buf), 1843 "%llu", inline_version); 1844 err = osd_req_op_xattr_init(req, 2, CEPH_OSD_OP_SETXATTR, 1845 "inline_version", 1846 xattr_buf, xattr_len, 0, 0); 1847 if (err) 1848 goto out_put; 1849 } 1850 1851 req->r_mtime = inode->i_mtime; 1852 err = ceph_osdc_start_request(&fsc->client->osdc, req, false); 1853 if (!err) 1854 err = ceph_osdc_wait_request(&fsc->client->osdc, req); 1855 1856 ceph_update_write_latency(&fsc->mdsc->metric, req->r_start_latency, 1857 req->r_end_latency, err); 1858 1859 out_put: 1860 ceph_osdc_put_request(req); 1861 if (err == -ECANCELED) 1862 err = 0; 1863 out: 1864 if (page && page != locked_page) { 1865 if (from_pagecache) { 1866 unlock_page(page); 1867 put_page(page); 1868 } else 1869 __free_pages(page, 0); 1870 } 1871 1872 dout("uninline_data %p %llx.%llx inline_version %llu = %d\n", 1873 inode, ceph_vinop(inode), inline_version, err); 1874 return err; 1875 } 1876 1877 static const struct vm_operations_struct ceph_vmops = { 1878 .fault = ceph_filemap_fault, 1879 .page_mkwrite = ceph_page_mkwrite, 1880 }; 1881 1882 int ceph_mmap(struct file *file, struct vm_area_struct *vma) 1883 { 1884 struct address_space *mapping = file->f_mapping; 1885 1886 if (!mapping->a_ops->readpage) 1887 return -ENOEXEC; 1888 file_accessed(file); 1889 vma->vm_ops = &ceph_vmops; 1890 return 0; 1891 } 1892 1893 enum { 1894 POOL_READ = 1, 1895 POOL_WRITE = 2, 1896 }; 1897 1898 static int __ceph_pool_perm_get(struct ceph_inode_info *ci, 1899 s64 pool, struct ceph_string *pool_ns) 1900 { 1901 struct ceph_fs_client *fsc = ceph_inode_to_client(&ci->vfs_inode); 1902 struct ceph_mds_client *mdsc = fsc->mdsc; 1903 struct ceph_osd_request *rd_req = NULL, *wr_req = NULL; 1904 struct rb_node **p, *parent; 1905 struct ceph_pool_perm *perm; 1906 struct page **pages; 1907 size_t pool_ns_len; 1908 int err = 0, err2 = 0, have = 0; 1909 1910 down_read(&mdsc->pool_perm_rwsem); 1911 p = &mdsc->pool_perm_tree.rb_node; 1912 while (*p) { 1913 perm = rb_entry(*p, struct ceph_pool_perm, node); 1914 if (pool < perm->pool) 1915 p = &(*p)->rb_left; 1916 else if (pool > perm->pool) 1917 p = &(*p)->rb_right; 1918 else { 1919 int ret = ceph_compare_string(pool_ns, 1920 perm->pool_ns, 1921 perm->pool_ns_len); 1922 if (ret < 0) 1923 p = &(*p)->rb_left; 1924 else if (ret > 0) 1925 p = &(*p)->rb_right; 1926 else { 1927 have = perm->perm; 1928 break; 1929 } 1930 } 1931 } 1932 up_read(&mdsc->pool_perm_rwsem); 1933 if (*p) 1934 goto out; 1935 1936 if (pool_ns) 1937 dout("__ceph_pool_perm_get pool %lld ns %.*s no perm cached\n", 1938 pool, (int)pool_ns->len, pool_ns->str); 1939 else 1940 dout("__ceph_pool_perm_get pool %lld no perm cached\n", pool); 1941 1942 down_write(&mdsc->pool_perm_rwsem); 1943 p = &mdsc->pool_perm_tree.rb_node; 1944 parent = NULL; 1945 while (*p) { 1946 parent = *p; 1947 perm = rb_entry(parent, struct ceph_pool_perm, node); 1948 if (pool < perm->pool) 1949 p = &(*p)->rb_left; 1950 else if (pool > perm->pool) 1951 p = &(*p)->rb_right; 1952 else { 1953 int ret = ceph_compare_string(pool_ns, 1954 perm->pool_ns, 1955 perm->pool_ns_len); 1956 if (ret < 0) 1957 p = &(*p)->rb_left; 1958 else if (ret > 0) 1959 p = &(*p)->rb_right; 1960 else { 1961 have = perm->perm; 1962 break; 1963 } 1964 } 1965 } 1966 if (*p) { 1967 up_write(&mdsc->pool_perm_rwsem); 1968 goto out; 1969 } 1970 1971 rd_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL, 1972 1, false, GFP_NOFS); 1973 if (!rd_req) { 1974 err = -ENOMEM; 1975 goto out_unlock; 1976 } 1977 1978 rd_req->r_flags = CEPH_OSD_FLAG_READ; 1979 osd_req_op_init(rd_req, 0, CEPH_OSD_OP_STAT, 0); 1980 rd_req->r_base_oloc.pool = pool; 1981 if (pool_ns) 1982 rd_req->r_base_oloc.pool_ns = ceph_get_string(pool_ns); 1983 ceph_oid_printf(&rd_req->r_base_oid, "%llx.00000000", ci->i_vino.ino); 1984 1985 err = ceph_osdc_alloc_messages(rd_req, GFP_NOFS); 1986 if (err) 1987 goto out_unlock; 1988 1989 wr_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL, 1990 1, false, GFP_NOFS); 1991 if (!wr_req) { 1992 err = -ENOMEM; 1993 goto out_unlock; 1994 } 1995 1996 wr_req->r_flags = CEPH_OSD_FLAG_WRITE; 1997 osd_req_op_init(wr_req, 0, CEPH_OSD_OP_CREATE, CEPH_OSD_OP_FLAG_EXCL); 1998 ceph_oloc_copy(&wr_req->r_base_oloc, &rd_req->r_base_oloc); 1999 ceph_oid_copy(&wr_req->r_base_oid, &rd_req->r_base_oid); 2000 2001 err = ceph_osdc_alloc_messages(wr_req, GFP_NOFS); 2002 if (err) 2003 goto out_unlock; 2004 2005 /* one page should be large enough for STAT data */ 2006 pages = ceph_alloc_page_vector(1, GFP_KERNEL); 2007 if (IS_ERR(pages)) { 2008 err = PTR_ERR(pages); 2009 goto out_unlock; 2010 } 2011 2012 osd_req_op_raw_data_in_pages(rd_req, 0, pages, PAGE_SIZE, 2013 0, false, true); 2014 err = ceph_osdc_start_request(&fsc->client->osdc, rd_req, false); 2015 2016 wr_req->r_mtime = ci->vfs_inode.i_mtime; 2017 err2 = ceph_osdc_start_request(&fsc->client->osdc, wr_req, false); 2018 2019 if (!err) 2020 err = ceph_osdc_wait_request(&fsc->client->osdc, rd_req); 2021 if (!err2) 2022 err2 = ceph_osdc_wait_request(&fsc->client->osdc, wr_req); 2023 2024 if (err >= 0 || err == -ENOENT) 2025 have |= POOL_READ; 2026 else if (err != -EPERM) { 2027 if (err == -EBLOCKLISTED) 2028 fsc->blocklisted = true; 2029 goto out_unlock; 2030 } 2031 2032 if (err2 == 0 || err2 == -EEXIST) 2033 have |= POOL_WRITE; 2034 else if (err2 != -EPERM) { 2035 if (err2 == -EBLOCKLISTED) 2036 fsc->blocklisted = true; 2037 err = err2; 2038 goto out_unlock; 2039 } 2040 2041 pool_ns_len = pool_ns ? pool_ns->len : 0; 2042 perm = kmalloc(sizeof(*perm) + pool_ns_len + 1, GFP_NOFS); 2043 if (!perm) { 2044 err = -ENOMEM; 2045 goto out_unlock; 2046 } 2047 2048 perm->pool = pool; 2049 perm->perm = have; 2050 perm->pool_ns_len = pool_ns_len; 2051 if (pool_ns_len > 0) 2052 memcpy(perm->pool_ns, pool_ns->str, pool_ns_len); 2053 perm->pool_ns[pool_ns_len] = 0; 2054 2055 rb_link_node(&perm->node, parent, p); 2056 rb_insert_color(&perm->node, &mdsc->pool_perm_tree); 2057 err = 0; 2058 out_unlock: 2059 up_write(&mdsc->pool_perm_rwsem); 2060 2061 ceph_osdc_put_request(rd_req); 2062 ceph_osdc_put_request(wr_req); 2063 out: 2064 if (!err) 2065 err = have; 2066 if (pool_ns) 2067 dout("__ceph_pool_perm_get pool %lld ns %.*s result = %d\n", 2068 pool, (int)pool_ns->len, pool_ns->str, err); 2069 else 2070 dout("__ceph_pool_perm_get pool %lld result = %d\n", pool, err); 2071 return err; 2072 } 2073 2074 int ceph_pool_perm_check(struct inode *inode, int need) 2075 { 2076 struct ceph_inode_info *ci = ceph_inode(inode); 2077 struct ceph_string *pool_ns; 2078 s64 pool; 2079 int ret, flags; 2080 2081 if (ci->i_vino.snap != CEPH_NOSNAP) { 2082 /* 2083 * Pool permission check needs to write to the first object. 2084 * But for snapshot, head of the first object may have alread 2085 * been deleted. Skip check to avoid creating orphan object. 2086 */ 2087 return 0; 2088 } 2089 2090 if (ceph_test_mount_opt(ceph_inode_to_client(inode), 2091 NOPOOLPERM)) 2092 return 0; 2093 2094 spin_lock(&ci->i_ceph_lock); 2095 flags = ci->i_ceph_flags; 2096 pool = ci->i_layout.pool_id; 2097 spin_unlock(&ci->i_ceph_lock); 2098 check: 2099 if (flags & CEPH_I_POOL_PERM) { 2100 if ((need & CEPH_CAP_FILE_RD) && !(flags & CEPH_I_POOL_RD)) { 2101 dout("ceph_pool_perm_check pool %lld no read perm\n", 2102 pool); 2103 return -EPERM; 2104 } 2105 if ((need & CEPH_CAP_FILE_WR) && !(flags & CEPH_I_POOL_WR)) { 2106 dout("ceph_pool_perm_check pool %lld no write perm\n", 2107 pool); 2108 return -EPERM; 2109 } 2110 return 0; 2111 } 2112 2113 pool_ns = ceph_try_get_string(ci->i_layout.pool_ns); 2114 ret = __ceph_pool_perm_get(ci, pool, pool_ns); 2115 ceph_put_string(pool_ns); 2116 if (ret < 0) 2117 return ret; 2118 2119 flags = CEPH_I_POOL_PERM; 2120 if (ret & POOL_READ) 2121 flags |= CEPH_I_POOL_RD; 2122 if (ret & POOL_WRITE) 2123 flags |= CEPH_I_POOL_WR; 2124 2125 spin_lock(&ci->i_ceph_lock); 2126 if (pool == ci->i_layout.pool_id && 2127 pool_ns == rcu_dereference_raw(ci->i_layout.pool_ns)) { 2128 ci->i_ceph_flags |= flags; 2129 } else { 2130 pool = ci->i_layout.pool_id; 2131 flags = ci->i_ceph_flags; 2132 } 2133 spin_unlock(&ci->i_ceph_lock); 2134 goto check; 2135 } 2136 2137 void ceph_pool_perm_destroy(struct ceph_mds_client *mdsc) 2138 { 2139 struct ceph_pool_perm *perm; 2140 struct rb_node *n; 2141 2142 while (!RB_EMPTY_ROOT(&mdsc->pool_perm_tree)) { 2143 n = rb_first(&mdsc->pool_perm_tree); 2144 perm = rb_entry(n, struct ceph_pool_perm, node); 2145 rb_erase(n, &mdsc->pool_perm_tree); 2146 kfree(perm); 2147 } 2148 } 2149