1 #include <linux/ceph/ceph_debug.h> 2 3 #include <linux/backing-dev.h> 4 #include <linux/fs.h> 5 #include <linux/mm.h> 6 #include <linux/pagemap.h> 7 #include <linux/writeback.h> /* generic_writepages */ 8 #include <linux/slab.h> 9 #include <linux/pagevec.h> 10 #include <linux/task_io_accounting_ops.h> 11 #include <linux/signal.h> 12 13 #include "super.h" 14 #include "mds_client.h" 15 #include "cache.h" 16 #include <linux/ceph/osd_client.h> 17 18 /* 19 * Ceph address space ops. 20 * 21 * There are a few funny things going on here. 22 * 23 * The page->private field is used to reference a struct 24 * ceph_snap_context for _every_ dirty page. This indicates which 25 * snapshot the page was logically dirtied in, and thus which snap 26 * context needs to be associated with the osd write during writeback. 27 * 28 * Similarly, struct ceph_inode_info maintains a set of counters to 29 * count dirty pages on the inode. In the absence of snapshots, 30 * i_wrbuffer_ref == i_wrbuffer_ref_head == the dirty page count. 31 * 32 * When a snapshot is taken (that is, when the client receives 33 * notification that a snapshot was taken), each inode with caps and 34 * with dirty pages (dirty pages implies there is a cap) gets a new 35 * ceph_cap_snap in the i_cap_snaps list (which is sorted in ascending 36 * order, new snaps go to the tail). The i_wrbuffer_ref_head count is 37 * moved to capsnap->dirty. (Unless a sync write is currently in 38 * progress. In that case, the capsnap is said to be "pending", new 39 * writes cannot start, and the capsnap isn't "finalized" until the 40 * write completes (or fails) and a final size/mtime for the inode for 41 * that snap can be settled upon.) i_wrbuffer_ref_head is reset to 0. 42 * 43 * On writeback, we must submit writes to the osd IN SNAP ORDER. So, 44 * we look for the first capsnap in i_cap_snaps and write out pages in 45 * that snap context _only_. Then we move on to the next capsnap, 46 * eventually reaching the "live" or "head" context (i.e., pages that 47 * are not yet snapped) and are writing the most recently dirtied 48 * pages. 49 * 50 * Invalidate and so forth must take care to ensure the dirty page 51 * accounting is preserved. 52 */ 53 54 #define CONGESTION_ON_THRESH(congestion_kb) (congestion_kb >> (PAGE_SHIFT-10)) 55 #define CONGESTION_OFF_THRESH(congestion_kb) \ 56 (CONGESTION_ON_THRESH(congestion_kb) - \ 57 (CONGESTION_ON_THRESH(congestion_kb) >> 2)) 58 59 static inline struct ceph_snap_context *page_snap_context(struct page *page) 60 { 61 if (PagePrivate(page)) 62 return (void *)page->private; 63 return NULL; 64 } 65 66 /* 67 * Dirty a page. Optimistically adjust accounting, on the assumption 68 * that we won't race with invalidate. If we do, readjust. 69 */ 70 static int ceph_set_page_dirty(struct page *page) 71 { 72 struct address_space *mapping = page->mapping; 73 struct inode *inode; 74 struct ceph_inode_info *ci; 75 struct ceph_snap_context *snapc; 76 int ret; 77 78 if (unlikely(!mapping)) 79 return !TestSetPageDirty(page); 80 81 if (PageDirty(page)) { 82 dout("%p set_page_dirty %p idx %lu -- already dirty\n", 83 mapping->host, page, page->index); 84 BUG_ON(!PagePrivate(page)); 85 return 0; 86 } 87 88 inode = mapping->host; 89 ci = ceph_inode(inode); 90 91 /* dirty the head */ 92 spin_lock(&ci->i_ceph_lock); 93 BUG_ON(ci->i_wr_ref == 0); // caller should hold Fw reference 94 if (__ceph_have_pending_cap_snap(ci)) { 95 struct ceph_cap_snap *capsnap = 96 list_last_entry(&ci->i_cap_snaps, 97 struct ceph_cap_snap, 98 ci_item); 99 snapc = ceph_get_snap_context(capsnap->context); 100 capsnap->dirty_pages++; 101 } else { 102 BUG_ON(!ci->i_head_snapc); 103 snapc = ceph_get_snap_context(ci->i_head_snapc); 104 ++ci->i_wrbuffer_ref_head; 105 } 106 if (ci->i_wrbuffer_ref == 0) 107 ihold(inode); 108 ++ci->i_wrbuffer_ref; 109 dout("%p set_page_dirty %p idx %lu head %d/%d -> %d/%d " 110 "snapc %p seq %lld (%d snaps)\n", 111 mapping->host, page, page->index, 112 ci->i_wrbuffer_ref-1, ci->i_wrbuffer_ref_head-1, 113 ci->i_wrbuffer_ref, ci->i_wrbuffer_ref_head, 114 snapc, snapc->seq, snapc->num_snaps); 115 spin_unlock(&ci->i_ceph_lock); 116 117 /* 118 * Reference snap context in page->private. Also set 119 * PagePrivate so that we get invalidatepage callback. 120 */ 121 BUG_ON(PagePrivate(page)); 122 page->private = (unsigned long)snapc; 123 SetPagePrivate(page); 124 125 ret = __set_page_dirty_nobuffers(page); 126 WARN_ON(!PageLocked(page)); 127 WARN_ON(!page->mapping); 128 129 return ret; 130 } 131 132 /* 133 * If we are truncating the full page (i.e. offset == 0), adjust the 134 * dirty page counters appropriately. Only called if there is private 135 * data on the page. 136 */ 137 static void ceph_invalidatepage(struct page *page, unsigned int offset, 138 unsigned int length) 139 { 140 struct inode *inode; 141 struct ceph_inode_info *ci; 142 struct ceph_snap_context *snapc = page_snap_context(page); 143 144 inode = page->mapping->host; 145 ci = ceph_inode(inode); 146 147 if (offset != 0 || length != PAGE_SIZE) { 148 dout("%p invalidatepage %p idx %lu partial dirty page %u~%u\n", 149 inode, page, page->index, offset, length); 150 return; 151 } 152 153 ceph_invalidate_fscache_page(inode, page); 154 155 if (!PagePrivate(page)) 156 return; 157 158 /* 159 * We can get non-dirty pages here due to races between 160 * set_page_dirty and truncate_complete_page; just spit out a 161 * warning, in case we end up with accounting problems later. 162 */ 163 if (!PageDirty(page)) 164 pr_err("%p invalidatepage %p page not dirty\n", inode, page); 165 166 ClearPageChecked(page); 167 168 dout("%p invalidatepage %p idx %lu full dirty page\n", 169 inode, page, page->index); 170 171 ceph_put_wrbuffer_cap_refs(ci, 1, snapc); 172 ceph_put_snap_context(snapc); 173 page->private = 0; 174 ClearPagePrivate(page); 175 } 176 177 static int ceph_releasepage(struct page *page, gfp_t g) 178 { 179 dout("%p releasepage %p idx %lu (%sdirty)\n", page->mapping->host, 180 page, page->index, PageDirty(page) ? "" : "not "); 181 182 /* Can we release the page from the cache? */ 183 if (!ceph_release_fscache_page(page, g)) 184 return 0; 185 186 return !PagePrivate(page); 187 } 188 189 /* 190 * read a single page, without unlocking it. 191 */ 192 static int readpage_nounlock(struct file *filp, struct page *page) 193 { 194 struct inode *inode = file_inode(filp); 195 struct ceph_inode_info *ci = ceph_inode(inode); 196 struct ceph_osd_client *osdc = 197 &ceph_inode_to_client(inode)->client->osdc; 198 int err = 0; 199 u64 off = page_offset(page); 200 u64 len = PAGE_SIZE; 201 202 if (off >= i_size_read(inode)) { 203 zero_user_segment(page, 0, PAGE_SIZE); 204 SetPageUptodate(page); 205 return 0; 206 } 207 208 if (ci->i_inline_version != CEPH_INLINE_NONE) { 209 /* 210 * Uptodate inline data should have been added 211 * into page cache while getting Fcr caps. 212 */ 213 if (off == 0) 214 return -EINVAL; 215 zero_user_segment(page, 0, PAGE_SIZE); 216 SetPageUptodate(page); 217 return 0; 218 } 219 220 err = ceph_readpage_from_fscache(inode, page); 221 if (err == 0) 222 goto out; 223 224 dout("readpage inode %p file %p page %p index %lu\n", 225 inode, filp, page, page->index); 226 err = ceph_osdc_readpages(osdc, ceph_vino(inode), &ci->i_layout, 227 off, &len, 228 ci->i_truncate_seq, ci->i_truncate_size, 229 &page, 1, 0); 230 if (err == -ENOENT) 231 err = 0; 232 if (err < 0) { 233 SetPageError(page); 234 ceph_fscache_readpage_cancel(inode, page); 235 goto out; 236 } 237 if (err < PAGE_SIZE) 238 /* zero fill remainder of page */ 239 zero_user_segment(page, err, PAGE_SIZE); 240 else 241 flush_dcache_page(page); 242 243 SetPageUptodate(page); 244 ceph_readpage_to_fscache(inode, page); 245 246 out: 247 return err < 0 ? err : 0; 248 } 249 250 static int ceph_readpage(struct file *filp, struct page *page) 251 { 252 int r = readpage_nounlock(filp, page); 253 unlock_page(page); 254 return r; 255 } 256 257 /* 258 * Finish an async read(ahead) op. 259 */ 260 static void finish_read(struct ceph_osd_request *req) 261 { 262 struct inode *inode = req->r_inode; 263 struct ceph_osd_data *osd_data; 264 int rc = req->r_result <= 0 ? req->r_result : 0; 265 int bytes = req->r_result >= 0 ? req->r_result : 0; 266 int num_pages; 267 int i; 268 269 dout("finish_read %p req %p rc %d bytes %d\n", inode, req, rc, bytes); 270 271 /* unlock all pages, zeroing any data we didn't read */ 272 osd_data = osd_req_op_extent_osd_data(req, 0); 273 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES); 274 num_pages = calc_pages_for((u64)osd_data->alignment, 275 (u64)osd_data->length); 276 for (i = 0; i < num_pages; i++) { 277 struct page *page = osd_data->pages[i]; 278 279 if (rc < 0 && rc != -ENOENT) { 280 ceph_fscache_readpage_cancel(inode, page); 281 goto unlock; 282 } 283 if (bytes < (int)PAGE_SIZE) { 284 /* zero (remainder of) page */ 285 int s = bytes < 0 ? 0 : bytes; 286 zero_user_segment(page, s, PAGE_SIZE); 287 } 288 dout("finish_read %p uptodate %p idx %lu\n", inode, page, 289 page->index); 290 flush_dcache_page(page); 291 SetPageUptodate(page); 292 ceph_readpage_to_fscache(inode, page); 293 unlock: 294 unlock_page(page); 295 put_page(page); 296 bytes -= PAGE_SIZE; 297 } 298 kfree(osd_data->pages); 299 } 300 301 /* 302 * start an async read(ahead) operation. return nr_pages we submitted 303 * a read for on success, or negative error code. 304 */ 305 static int start_read(struct inode *inode, struct list_head *page_list, int max) 306 { 307 struct ceph_osd_client *osdc = 308 &ceph_inode_to_client(inode)->client->osdc; 309 struct ceph_inode_info *ci = ceph_inode(inode); 310 struct page *page = list_entry(page_list->prev, struct page, lru); 311 struct ceph_vino vino; 312 struct ceph_osd_request *req; 313 u64 off; 314 u64 len; 315 int i; 316 struct page **pages; 317 pgoff_t next_index; 318 int nr_pages = 0; 319 int got = 0; 320 int ret = 0; 321 322 if (!current->journal_info) { 323 /* caller of readpages does not hold buffer and read caps 324 * (fadvise, madvise and readahead cases) */ 325 int want = CEPH_CAP_FILE_CACHE; 326 ret = ceph_try_get_caps(ci, CEPH_CAP_FILE_RD, want, &got); 327 if (ret < 0) { 328 dout("start_read %p, error getting cap\n", inode); 329 } else if (!(got & want)) { 330 dout("start_read %p, no cache cap\n", inode); 331 ret = 0; 332 } 333 if (ret <= 0) { 334 if (got) 335 ceph_put_cap_refs(ci, got); 336 while (!list_empty(page_list)) { 337 page = list_entry(page_list->prev, 338 struct page, lru); 339 list_del(&page->lru); 340 put_page(page); 341 } 342 return ret; 343 } 344 } 345 346 off = (u64) page_offset(page); 347 348 /* count pages */ 349 next_index = page->index; 350 list_for_each_entry_reverse(page, page_list, lru) { 351 if (page->index != next_index) 352 break; 353 nr_pages++; 354 next_index++; 355 if (max && nr_pages == max) 356 break; 357 } 358 len = nr_pages << PAGE_SHIFT; 359 dout("start_read %p nr_pages %d is %lld~%lld\n", inode, nr_pages, 360 off, len); 361 vino = ceph_vino(inode); 362 req = ceph_osdc_new_request(osdc, &ci->i_layout, vino, off, &len, 363 0, 1, CEPH_OSD_OP_READ, 364 CEPH_OSD_FLAG_READ, NULL, 365 ci->i_truncate_seq, ci->i_truncate_size, 366 false); 367 if (IS_ERR(req)) { 368 ret = PTR_ERR(req); 369 goto out; 370 } 371 372 /* build page vector */ 373 nr_pages = calc_pages_for(0, len); 374 pages = kmalloc(sizeof(*pages) * nr_pages, GFP_KERNEL); 375 if (!pages) { 376 ret = -ENOMEM; 377 goto out_put; 378 } 379 for (i = 0; i < nr_pages; ++i) { 380 page = list_entry(page_list->prev, struct page, lru); 381 BUG_ON(PageLocked(page)); 382 list_del(&page->lru); 383 384 dout("start_read %p adding %p idx %lu\n", inode, page, 385 page->index); 386 if (add_to_page_cache_lru(page, &inode->i_data, page->index, 387 GFP_KERNEL)) { 388 ceph_fscache_uncache_page(inode, page); 389 put_page(page); 390 dout("start_read %p add_to_page_cache failed %p\n", 391 inode, page); 392 nr_pages = i; 393 if (nr_pages > 0) { 394 len = nr_pages << PAGE_SHIFT; 395 osd_req_op_extent_update(req, 0, len); 396 break; 397 } 398 goto out_pages; 399 } 400 pages[i] = page; 401 } 402 osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0, false, false); 403 req->r_callback = finish_read; 404 req->r_inode = inode; 405 406 dout("start_read %p starting %p %lld~%lld\n", inode, req, off, len); 407 ret = ceph_osdc_start_request(osdc, req, false); 408 if (ret < 0) 409 goto out_pages; 410 ceph_osdc_put_request(req); 411 412 /* After adding locked pages to page cache, the inode holds cache cap. 413 * So we can drop our cap refs. */ 414 if (got) 415 ceph_put_cap_refs(ci, got); 416 417 return nr_pages; 418 419 out_pages: 420 for (i = 0; i < nr_pages; ++i) { 421 ceph_fscache_readpage_cancel(inode, pages[i]); 422 unlock_page(pages[i]); 423 } 424 ceph_put_page_vector(pages, nr_pages, false); 425 out_put: 426 ceph_osdc_put_request(req); 427 out: 428 if (got) 429 ceph_put_cap_refs(ci, got); 430 return ret; 431 } 432 433 434 /* 435 * Read multiple pages. Leave pages we don't read + unlock in page_list; 436 * the caller (VM) cleans them up. 437 */ 438 static int ceph_readpages(struct file *file, struct address_space *mapping, 439 struct list_head *page_list, unsigned nr_pages) 440 { 441 struct inode *inode = file_inode(file); 442 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 443 int rc = 0; 444 int max = 0; 445 446 if (ceph_inode(inode)->i_inline_version != CEPH_INLINE_NONE) 447 return -EINVAL; 448 449 rc = ceph_readpages_from_fscache(mapping->host, mapping, page_list, 450 &nr_pages); 451 452 if (rc == 0) 453 goto out; 454 455 if (fsc->mount_options->rsize >= PAGE_SIZE) 456 max = (fsc->mount_options->rsize + PAGE_SIZE - 1) 457 >> PAGE_SHIFT; 458 459 dout("readpages %p file %p nr_pages %d max %d\n", inode, 460 file, nr_pages, 461 max); 462 while (!list_empty(page_list)) { 463 rc = start_read(inode, page_list, max); 464 if (rc < 0) 465 goto out; 466 } 467 out: 468 ceph_fscache_readpages_cancel(inode, page_list); 469 470 dout("readpages %p file %p ret %d\n", inode, file, rc); 471 return rc; 472 } 473 474 /* 475 * Get ref for the oldest snapc for an inode with dirty data... that is, the 476 * only snap context we are allowed to write back. 477 */ 478 static struct ceph_snap_context *get_oldest_context(struct inode *inode, 479 loff_t *snap_size, 480 u64 *truncate_size, 481 u32 *truncate_seq) 482 { 483 struct ceph_inode_info *ci = ceph_inode(inode); 484 struct ceph_snap_context *snapc = NULL; 485 struct ceph_cap_snap *capsnap = NULL; 486 487 spin_lock(&ci->i_ceph_lock); 488 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) { 489 dout(" cap_snap %p snapc %p has %d dirty pages\n", capsnap, 490 capsnap->context, capsnap->dirty_pages); 491 if (capsnap->dirty_pages) { 492 snapc = ceph_get_snap_context(capsnap->context); 493 if (snap_size) 494 *snap_size = capsnap->size; 495 if (truncate_size) 496 *truncate_size = capsnap->truncate_size; 497 if (truncate_seq) 498 *truncate_seq = capsnap->truncate_seq; 499 break; 500 } 501 } 502 if (!snapc && ci->i_wrbuffer_ref_head) { 503 snapc = ceph_get_snap_context(ci->i_head_snapc); 504 dout(" head snapc %p has %d dirty pages\n", 505 snapc, ci->i_wrbuffer_ref_head); 506 if (truncate_size) 507 *truncate_size = ci->i_truncate_size; 508 if (truncate_seq) 509 *truncate_seq = ci->i_truncate_seq; 510 } 511 spin_unlock(&ci->i_ceph_lock); 512 return snapc; 513 } 514 515 /* 516 * Write a single page, but leave the page locked. 517 * 518 * If we get a write error, set the page error bit, but still adjust the 519 * dirty page accounting (i.e., page is no longer dirty). 520 */ 521 static int writepage_nounlock(struct page *page, struct writeback_control *wbc) 522 { 523 struct inode *inode; 524 struct ceph_inode_info *ci; 525 struct ceph_fs_client *fsc; 526 struct ceph_osd_client *osdc; 527 struct ceph_snap_context *snapc, *oldest; 528 loff_t page_off = page_offset(page); 529 loff_t snap_size = -1; 530 long writeback_stat; 531 u64 truncate_size; 532 u32 truncate_seq; 533 int err = 0, len = PAGE_SIZE; 534 535 dout("writepage %p idx %lu\n", page, page->index); 536 537 if (!page->mapping || !page->mapping->host) { 538 dout("writepage %p - no mapping\n", page); 539 return -EFAULT; 540 } 541 inode = page->mapping->host; 542 ci = ceph_inode(inode); 543 fsc = ceph_inode_to_client(inode); 544 osdc = &fsc->client->osdc; 545 546 /* verify this is a writeable snap context */ 547 snapc = page_snap_context(page); 548 if (snapc == NULL) { 549 dout("writepage %p page %p not dirty?\n", inode, page); 550 goto out; 551 } 552 oldest = get_oldest_context(inode, &snap_size, 553 &truncate_size, &truncate_seq); 554 if (snapc->seq > oldest->seq) { 555 dout("writepage %p page %p snapc %p not writeable - noop\n", 556 inode, page, snapc); 557 /* we should only noop if called by kswapd */ 558 WARN_ON((current->flags & PF_MEMALLOC) == 0); 559 ceph_put_snap_context(oldest); 560 goto out; 561 } 562 ceph_put_snap_context(oldest); 563 564 if (snap_size == -1) 565 snap_size = i_size_read(inode); 566 567 /* is this a partial page at end of file? */ 568 if (page_off >= snap_size) { 569 dout("%p page eof %llu\n", page, snap_size); 570 goto out; 571 } 572 if (snap_size < page_off + len) 573 len = snap_size - page_off; 574 575 dout("writepage %p page %p index %lu on %llu~%u snapc %p\n", 576 inode, page, page->index, page_off, len, snapc); 577 578 writeback_stat = atomic_long_inc_return(&fsc->writeback_count); 579 if (writeback_stat > 580 CONGESTION_ON_THRESH(fsc->mount_options->congestion_kb)) 581 set_bdi_congested(&fsc->backing_dev_info, BLK_RW_ASYNC); 582 583 set_page_writeback(page); 584 err = ceph_osdc_writepages(osdc, ceph_vino(inode), 585 &ci->i_layout, snapc, 586 page_off, len, 587 truncate_seq, truncate_size, 588 &inode->i_mtime, &page, 1); 589 if (err < 0) { 590 struct writeback_control tmp_wbc; 591 if (!wbc) 592 wbc = &tmp_wbc; 593 if (err == -ERESTARTSYS) { 594 /* killed by SIGKILL */ 595 dout("writepage interrupted page %p\n", page); 596 redirty_page_for_writepage(wbc, page); 597 end_page_writeback(page); 598 goto out; 599 } 600 dout("writepage setting page/mapping error %d %p\n", 601 err, page); 602 SetPageError(page); 603 mapping_set_error(&inode->i_data, err); 604 wbc->pages_skipped++; 605 } else { 606 dout("writepage cleaned page %p\n", page); 607 err = 0; /* vfs expects us to return 0 */ 608 } 609 page->private = 0; 610 ClearPagePrivate(page); 611 end_page_writeback(page); 612 ceph_put_wrbuffer_cap_refs(ci, 1, snapc); 613 ceph_put_snap_context(snapc); /* page's reference */ 614 out: 615 return err; 616 } 617 618 static int ceph_writepage(struct page *page, struct writeback_control *wbc) 619 { 620 int err; 621 struct inode *inode = page->mapping->host; 622 BUG_ON(!inode); 623 ihold(inode); 624 err = writepage_nounlock(page, wbc); 625 if (err == -ERESTARTSYS) { 626 /* direct memory reclaimer was killed by SIGKILL. return 0 627 * to prevent caller from setting mapping/page error */ 628 err = 0; 629 } 630 unlock_page(page); 631 iput(inode); 632 return err; 633 } 634 635 /* 636 * lame release_pages helper. release_pages() isn't exported to 637 * modules. 638 */ 639 static void ceph_release_pages(struct page **pages, int num) 640 { 641 struct pagevec pvec; 642 int i; 643 644 pagevec_init(&pvec, 0); 645 for (i = 0; i < num; i++) { 646 if (pagevec_add(&pvec, pages[i]) == 0) 647 pagevec_release(&pvec); 648 } 649 pagevec_release(&pvec); 650 } 651 652 /* 653 * async writeback completion handler. 654 * 655 * If we get an error, set the mapping error bit, but not the individual 656 * page error bits. 657 */ 658 static void writepages_finish(struct ceph_osd_request *req) 659 { 660 struct inode *inode = req->r_inode; 661 struct ceph_inode_info *ci = ceph_inode(inode); 662 struct ceph_osd_data *osd_data; 663 struct page *page; 664 int num_pages, total_pages = 0; 665 int i, j; 666 int rc = req->r_result; 667 struct ceph_snap_context *snapc = req->r_snapc; 668 struct address_space *mapping = inode->i_mapping; 669 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 670 bool remove_page; 671 672 dout("writepages_finish %p rc %d\n", inode, rc); 673 if (rc < 0) 674 mapping_set_error(mapping, rc); 675 676 /* 677 * We lost the cache cap, need to truncate the page before 678 * it is unlocked, otherwise we'd truncate it later in the 679 * page truncation thread, possibly losing some data that 680 * raced its way in 681 */ 682 remove_page = !(ceph_caps_issued(ci) & 683 (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)); 684 685 /* clean all pages */ 686 for (i = 0; i < req->r_num_ops; i++) { 687 if (req->r_ops[i].op != CEPH_OSD_OP_WRITE) 688 break; 689 690 osd_data = osd_req_op_extent_osd_data(req, i); 691 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES); 692 num_pages = calc_pages_for((u64)osd_data->alignment, 693 (u64)osd_data->length); 694 total_pages += num_pages; 695 for (j = 0; j < num_pages; j++) { 696 page = osd_data->pages[j]; 697 BUG_ON(!page); 698 WARN_ON(!PageUptodate(page)); 699 700 if (atomic_long_dec_return(&fsc->writeback_count) < 701 CONGESTION_OFF_THRESH( 702 fsc->mount_options->congestion_kb)) 703 clear_bdi_congested(&fsc->backing_dev_info, 704 BLK_RW_ASYNC); 705 706 ceph_put_snap_context(page_snap_context(page)); 707 page->private = 0; 708 ClearPagePrivate(page); 709 dout("unlocking %p\n", page); 710 end_page_writeback(page); 711 712 if (remove_page) 713 generic_error_remove_page(inode->i_mapping, 714 page); 715 716 unlock_page(page); 717 } 718 dout("writepages_finish %p wrote %llu bytes cleaned %d pages\n", 719 inode, osd_data->length, rc >= 0 ? num_pages : 0); 720 721 ceph_release_pages(osd_data->pages, num_pages); 722 } 723 724 ceph_put_wrbuffer_cap_refs(ci, total_pages, snapc); 725 726 osd_data = osd_req_op_extent_osd_data(req, 0); 727 if (osd_data->pages_from_pool) 728 mempool_free(osd_data->pages, 729 ceph_sb_to_client(inode->i_sb)->wb_pagevec_pool); 730 else 731 kfree(osd_data->pages); 732 ceph_osdc_put_request(req); 733 } 734 735 /* 736 * initiate async writeback 737 */ 738 static int ceph_writepages_start(struct address_space *mapping, 739 struct writeback_control *wbc) 740 { 741 struct inode *inode = mapping->host; 742 struct ceph_inode_info *ci = ceph_inode(inode); 743 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 744 struct ceph_vino vino = ceph_vino(inode); 745 pgoff_t index, start, end; 746 int range_whole = 0; 747 int should_loop = 1; 748 pgoff_t max_pages = 0, max_pages_ever = 0; 749 struct ceph_snap_context *snapc = NULL, *last_snapc = NULL, *pgsnapc; 750 struct pagevec pvec; 751 int done = 0; 752 int rc = 0; 753 unsigned int wsize = i_blocksize(inode); 754 struct ceph_osd_request *req = NULL; 755 int do_sync = 0; 756 loff_t snap_size, i_size; 757 u64 truncate_size; 758 u32 truncate_seq; 759 760 /* 761 * Include a 'sync' in the OSD request if this is a data 762 * integrity write (e.g., O_SYNC write or fsync()), or if our 763 * cap is being revoked. 764 */ 765 if ((wbc->sync_mode == WB_SYNC_ALL) || 766 ceph_caps_revoking(ci, CEPH_CAP_FILE_BUFFER)) 767 do_sync = 1; 768 dout("writepages_start %p dosync=%d (mode=%s)\n", 769 inode, do_sync, 770 wbc->sync_mode == WB_SYNC_NONE ? "NONE" : 771 (wbc->sync_mode == WB_SYNC_ALL ? "ALL" : "HOLD")); 772 773 if (READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) { 774 if (ci->i_wrbuffer_ref > 0) { 775 pr_warn_ratelimited( 776 "writepage_start %p %lld forced umount\n", 777 inode, ceph_ino(inode)); 778 } 779 mapping_set_error(mapping, -EIO); 780 return -EIO; /* we're in a forced umount, don't write! */ 781 } 782 if (fsc->mount_options->wsize && fsc->mount_options->wsize < wsize) 783 wsize = fsc->mount_options->wsize; 784 if (wsize < PAGE_SIZE) 785 wsize = PAGE_SIZE; 786 max_pages_ever = wsize >> PAGE_SHIFT; 787 788 pagevec_init(&pvec, 0); 789 790 /* where to start/end? */ 791 if (wbc->range_cyclic) { 792 start = mapping->writeback_index; /* Start from prev offset */ 793 end = -1; 794 dout(" cyclic, start at %lu\n", start); 795 } else { 796 start = wbc->range_start >> PAGE_SHIFT; 797 end = wbc->range_end >> PAGE_SHIFT; 798 if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) 799 range_whole = 1; 800 should_loop = 0; 801 dout(" not cyclic, %lu to %lu\n", start, end); 802 } 803 index = start; 804 805 retry: 806 /* find oldest snap context with dirty data */ 807 ceph_put_snap_context(snapc); 808 snap_size = -1; 809 snapc = get_oldest_context(inode, &snap_size, 810 &truncate_size, &truncate_seq); 811 if (!snapc) { 812 /* hmm, why does writepages get called when there 813 is no dirty data? */ 814 dout(" no snap context with dirty data?\n"); 815 goto out; 816 } 817 dout(" oldest snapc is %p seq %lld (%d snaps)\n", 818 snapc, snapc->seq, snapc->num_snaps); 819 820 i_size = i_size_read(inode); 821 822 if (last_snapc && snapc != last_snapc) { 823 /* if we switched to a newer snapc, restart our scan at the 824 * start of the original file range. */ 825 dout(" snapc differs from last pass, restarting at %lu\n", 826 index); 827 index = start; 828 } 829 last_snapc = snapc; 830 831 while (!done && index <= end) { 832 unsigned i; 833 int first; 834 pgoff_t strip_unit_end = 0; 835 int num_ops = 0, op_idx; 836 int pvec_pages, locked_pages = 0; 837 struct page **pages = NULL, **data_pages; 838 mempool_t *pool = NULL; /* Becomes non-null if mempool used */ 839 struct page *page; 840 int want; 841 u64 offset = 0, len = 0; 842 843 max_pages = max_pages_ever; 844 845 get_more_pages: 846 first = -1; 847 want = min(end - index, 848 min((pgoff_t)PAGEVEC_SIZE, 849 max_pages - (pgoff_t)locked_pages) - 1) 850 + 1; 851 pvec_pages = pagevec_lookup_tag(&pvec, mapping, &index, 852 PAGECACHE_TAG_DIRTY, 853 want); 854 dout("pagevec_lookup_tag got %d\n", pvec_pages); 855 if (!pvec_pages && !locked_pages) 856 break; 857 for (i = 0; i < pvec_pages && locked_pages < max_pages; i++) { 858 page = pvec.pages[i]; 859 dout("? %p idx %lu\n", page, page->index); 860 if (locked_pages == 0) 861 lock_page(page); /* first page */ 862 else if (!trylock_page(page)) 863 break; 864 865 /* only dirty pages, or our accounting breaks */ 866 if (unlikely(!PageDirty(page)) || 867 unlikely(page->mapping != mapping)) { 868 dout("!dirty or !mapping %p\n", page); 869 unlock_page(page); 870 break; 871 } 872 if (!wbc->range_cyclic && page->index > end) { 873 dout("end of range %p\n", page); 874 done = 1; 875 unlock_page(page); 876 break; 877 } 878 if (strip_unit_end && (page->index > strip_unit_end)) { 879 dout("end of strip unit %p\n", page); 880 unlock_page(page); 881 break; 882 } 883 if (wbc->sync_mode != WB_SYNC_NONE) { 884 dout("waiting on writeback %p\n", page); 885 wait_on_page_writeback(page); 886 } 887 if (page_offset(page) >= 888 (snap_size == -1 ? i_size : snap_size)) { 889 dout("%p page eof %llu\n", page, 890 (snap_size == -1 ? i_size : snap_size)); 891 done = 1; 892 unlock_page(page); 893 break; 894 } 895 if (PageWriteback(page)) { 896 dout("%p under writeback\n", page); 897 unlock_page(page); 898 break; 899 } 900 901 /* only if matching snap context */ 902 pgsnapc = page_snap_context(page); 903 if (pgsnapc->seq > snapc->seq) { 904 dout("page snapc %p %lld > oldest %p %lld\n", 905 pgsnapc, pgsnapc->seq, snapc, snapc->seq); 906 unlock_page(page); 907 if (!locked_pages) 908 continue; /* keep looking for snap */ 909 break; 910 } 911 912 if (!clear_page_dirty_for_io(page)) { 913 dout("%p !clear_page_dirty_for_io\n", page); 914 unlock_page(page); 915 break; 916 } 917 918 /* 919 * We have something to write. If this is 920 * the first locked page this time through, 921 * calculate max possinle write size and 922 * allocate a page array 923 */ 924 if (locked_pages == 0) { 925 u64 objnum; 926 u64 objoff; 927 928 /* prepare async write request */ 929 offset = (u64)page_offset(page); 930 len = wsize; 931 932 rc = ceph_calc_file_object_mapping(&ci->i_layout, 933 offset, len, 934 &objnum, &objoff, 935 &len); 936 if (rc < 0) { 937 unlock_page(page); 938 break; 939 } 940 941 num_ops = 1 + do_sync; 942 strip_unit_end = page->index + 943 ((len - 1) >> PAGE_SHIFT); 944 945 BUG_ON(pages); 946 max_pages = calc_pages_for(0, (u64)len); 947 pages = kmalloc(max_pages * sizeof (*pages), 948 GFP_NOFS); 949 if (!pages) { 950 pool = fsc->wb_pagevec_pool; 951 pages = mempool_alloc(pool, GFP_NOFS); 952 BUG_ON(!pages); 953 } 954 955 len = 0; 956 } else if (page->index != 957 (offset + len) >> PAGE_SHIFT) { 958 if (num_ops >= (pool ? CEPH_OSD_SLAB_OPS : 959 CEPH_OSD_MAX_OPS)) { 960 redirty_page_for_writepage(wbc, page); 961 unlock_page(page); 962 break; 963 } 964 965 num_ops++; 966 offset = (u64)page_offset(page); 967 len = 0; 968 } 969 970 /* note position of first page in pvec */ 971 if (first < 0) 972 first = i; 973 dout("%p will write page %p idx %lu\n", 974 inode, page, page->index); 975 976 if (atomic_long_inc_return(&fsc->writeback_count) > 977 CONGESTION_ON_THRESH( 978 fsc->mount_options->congestion_kb)) { 979 set_bdi_congested(&fsc->backing_dev_info, 980 BLK_RW_ASYNC); 981 } 982 983 pages[locked_pages] = page; 984 locked_pages++; 985 len += PAGE_SIZE; 986 } 987 988 /* did we get anything? */ 989 if (!locked_pages) 990 goto release_pvec_pages; 991 if (i) { 992 int j; 993 BUG_ON(!locked_pages || first < 0); 994 995 if (pvec_pages && i == pvec_pages && 996 locked_pages < max_pages) { 997 dout("reached end pvec, trying for more\n"); 998 pagevec_reinit(&pvec); 999 goto get_more_pages; 1000 } 1001 1002 /* shift unused pages over in the pvec... we 1003 * will need to release them below. */ 1004 for (j = i; j < pvec_pages; j++) { 1005 dout(" pvec leftover page %p\n", pvec.pages[j]); 1006 pvec.pages[j-i+first] = pvec.pages[j]; 1007 } 1008 pvec.nr -= i-first; 1009 } 1010 1011 new_request: 1012 offset = page_offset(pages[0]); 1013 len = wsize; 1014 1015 req = ceph_osdc_new_request(&fsc->client->osdc, 1016 &ci->i_layout, vino, 1017 offset, &len, 0, num_ops, 1018 CEPH_OSD_OP_WRITE, 1019 CEPH_OSD_FLAG_WRITE, 1020 snapc, truncate_seq, 1021 truncate_size, false); 1022 if (IS_ERR(req)) { 1023 req = ceph_osdc_new_request(&fsc->client->osdc, 1024 &ci->i_layout, vino, 1025 offset, &len, 0, 1026 min(num_ops, 1027 CEPH_OSD_SLAB_OPS), 1028 CEPH_OSD_OP_WRITE, 1029 CEPH_OSD_FLAG_WRITE, 1030 snapc, truncate_seq, 1031 truncate_size, true); 1032 BUG_ON(IS_ERR(req)); 1033 } 1034 BUG_ON(len < page_offset(pages[locked_pages - 1]) + 1035 PAGE_SIZE - offset); 1036 1037 req->r_callback = writepages_finish; 1038 req->r_inode = inode; 1039 1040 /* Format the osd request message and submit the write */ 1041 len = 0; 1042 data_pages = pages; 1043 op_idx = 0; 1044 for (i = 0; i < locked_pages; i++) { 1045 u64 cur_offset = page_offset(pages[i]); 1046 if (offset + len != cur_offset) { 1047 if (op_idx + do_sync + 1 == req->r_num_ops) 1048 break; 1049 osd_req_op_extent_dup_last(req, op_idx, 1050 cur_offset - offset); 1051 dout("writepages got pages at %llu~%llu\n", 1052 offset, len); 1053 osd_req_op_extent_osd_data_pages(req, op_idx, 1054 data_pages, len, 0, 1055 !!pool, false); 1056 osd_req_op_extent_update(req, op_idx, len); 1057 1058 len = 0; 1059 offset = cur_offset; 1060 data_pages = pages + i; 1061 op_idx++; 1062 } 1063 1064 set_page_writeback(pages[i]); 1065 len += PAGE_SIZE; 1066 } 1067 1068 if (snap_size != -1) { 1069 len = min(len, snap_size - offset); 1070 } else if (i == locked_pages) { 1071 /* writepages_finish() clears writeback pages 1072 * according to the data length, so make sure 1073 * data length covers all locked pages */ 1074 u64 min_len = len + 1 - PAGE_SIZE; 1075 len = min(len, (u64)i_size_read(inode) - offset); 1076 len = max(len, min_len); 1077 } 1078 dout("writepages got pages at %llu~%llu\n", offset, len); 1079 1080 osd_req_op_extent_osd_data_pages(req, op_idx, data_pages, len, 1081 0, !!pool, false); 1082 osd_req_op_extent_update(req, op_idx, len); 1083 1084 if (do_sync) { 1085 op_idx++; 1086 osd_req_op_init(req, op_idx, CEPH_OSD_OP_STARTSYNC, 0); 1087 } 1088 BUG_ON(op_idx + 1 != req->r_num_ops); 1089 1090 pool = NULL; 1091 if (i < locked_pages) { 1092 BUG_ON(num_ops <= req->r_num_ops); 1093 num_ops -= req->r_num_ops; 1094 num_ops += do_sync; 1095 locked_pages -= i; 1096 1097 /* allocate new pages array for next request */ 1098 data_pages = pages; 1099 pages = kmalloc(locked_pages * sizeof (*pages), 1100 GFP_NOFS); 1101 if (!pages) { 1102 pool = fsc->wb_pagevec_pool; 1103 pages = mempool_alloc(pool, GFP_NOFS); 1104 BUG_ON(!pages); 1105 } 1106 memcpy(pages, data_pages + i, 1107 locked_pages * sizeof(*pages)); 1108 memset(data_pages + i, 0, 1109 locked_pages * sizeof(*pages)); 1110 } else { 1111 BUG_ON(num_ops != req->r_num_ops); 1112 index = pages[i - 1]->index + 1; 1113 /* request message now owns the pages array */ 1114 pages = NULL; 1115 } 1116 1117 req->r_mtime = inode->i_mtime; 1118 rc = ceph_osdc_start_request(&fsc->client->osdc, req, true); 1119 BUG_ON(rc); 1120 req = NULL; 1121 1122 wbc->nr_to_write -= i; 1123 if (pages) 1124 goto new_request; 1125 1126 if (wbc->nr_to_write <= 0) 1127 done = 1; 1128 1129 release_pvec_pages: 1130 dout("pagevec_release on %d pages (%p)\n", (int)pvec.nr, 1131 pvec.nr ? pvec.pages[0] : NULL); 1132 pagevec_release(&pvec); 1133 1134 if (locked_pages && !done) 1135 goto retry; 1136 } 1137 1138 if (should_loop && !done) { 1139 /* more to do; loop back to beginning of file */ 1140 dout("writepages looping back to beginning of file\n"); 1141 should_loop = 0; 1142 index = 0; 1143 goto retry; 1144 } 1145 1146 if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) 1147 mapping->writeback_index = index; 1148 1149 out: 1150 ceph_osdc_put_request(req); 1151 ceph_put_snap_context(snapc); 1152 dout("writepages done, rc = %d\n", rc); 1153 return rc; 1154 } 1155 1156 1157 1158 /* 1159 * See if a given @snapc is either writeable, or already written. 1160 */ 1161 static int context_is_writeable_or_written(struct inode *inode, 1162 struct ceph_snap_context *snapc) 1163 { 1164 struct ceph_snap_context *oldest = get_oldest_context(inode, NULL, 1165 NULL, NULL); 1166 int ret = !oldest || snapc->seq <= oldest->seq; 1167 1168 ceph_put_snap_context(oldest); 1169 return ret; 1170 } 1171 1172 /* 1173 * We are only allowed to write into/dirty the page if the page is 1174 * clean, or already dirty within the same snap context. 1175 * 1176 * called with page locked. 1177 * return success with page locked, 1178 * or any failure (incl -EAGAIN) with page unlocked. 1179 */ 1180 static int ceph_update_writeable_page(struct file *file, 1181 loff_t pos, unsigned len, 1182 struct page *page) 1183 { 1184 struct inode *inode = file_inode(file); 1185 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 1186 struct ceph_inode_info *ci = ceph_inode(inode); 1187 loff_t page_off = pos & PAGE_MASK; 1188 int pos_in_page = pos & ~PAGE_MASK; 1189 int end_in_page = pos_in_page + len; 1190 loff_t i_size; 1191 int r; 1192 struct ceph_snap_context *snapc, *oldest; 1193 1194 if (READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) { 1195 dout(" page %p forced umount\n", page); 1196 unlock_page(page); 1197 return -EIO; 1198 } 1199 1200 retry_locked: 1201 /* writepages currently holds page lock, but if we change that later, */ 1202 wait_on_page_writeback(page); 1203 1204 snapc = page_snap_context(page); 1205 if (snapc && snapc != ci->i_head_snapc) { 1206 /* 1207 * this page is already dirty in another (older) snap 1208 * context! is it writeable now? 1209 */ 1210 oldest = get_oldest_context(inode, NULL, NULL, NULL); 1211 1212 if (snapc->seq > oldest->seq) { 1213 ceph_put_snap_context(oldest); 1214 dout(" page %p snapc %p not current or oldest\n", 1215 page, snapc); 1216 /* 1217 * queue for writeback, and wait for snapc to 1218 * be writeable or written 1219 */ 1220 snapc = ceph_get_snap_context(snapc); 1221 unlock_page(page); 1222 ceph_queue_writeback(inode); 1223 r = wait_event_killable(ci->i_cap_wq, 1224 context_is_writeable_or_written(inode, snapc)); 1225 ceph_put_snap_context(snapc); 1226 if (r == -ERESTARTSYS) 1227 return r; 1228 return -EAGAIN; 1229 } 1230 ceph_put_snap_context(oldest); 1231 1232 /* yay, writeable, do it now (without dropping page lock) */ 1233 dout(" page %p snapc %p not current, but oldest\n", 1234 page, snapc); 1235 if (!clear_page_dirty_for_io(page)) 1236 goto retry_locked; 1237 r = writepage_nounlock(page, NULL); 1238 if (r < 0) 1239 goto fail_nosnap; 1240 goto retry_locked; 1241 } 1242 1243 if (PageUptodate(page)) { 1244 dout(" page %p already uptodate\n", page); 1245 return 0; 1246 } 1247 1248 /* full page? */ 1249 if (pos_in_page == 0 && len == PAGE_SIZE) 1250 return 0; 1251 1252 /* past end of file? */ 1253 i_size = i_size_read(inode); 1254 1255 if (page_off >= i_size || 1256 (pos_in_page == 0 && (pos+len) >= i_size && 1257 end_in_page - pos_in_page != PAGE_SIZE)) { 1258 dout(" zeroing %p 0 - %d and %d - %d\n", 1259 page, pos_in_page, end_in_page, (int)PAGE_SIZE); 1260 zero_user_segments(page, 1261 0, pos_in_page, 1262 end_in_page, PAGE_SIZE); 1263 return 0; 1264 } 1265 1266 /* we need to read it. */ 1267 r = readpage_nounlock(file, page); 1268 if (r < 0) 1269 goto fail_nosnap; 1270 goto retry_locked; 1271 fail_nosnap: 1272 unlock_page(page); 1273 return r; 1274 } 1275 1276 /* 1277 * We are only allowed to write into/dirty the page if the page is 1278 * clean, or already dirty within the same snap context. 1279 */ 1280 static int ceph_write_begin(struct file *file, struct address_space *mapping, 1281 loff_t pos, unsigned len, unsigned flags, 1282 struct page **pagep, void **fsdata) 1283 { 1284 struct inode *inode = file_inode(file); 1285 struct page *page; 1286 pgoff_t index = pos >> PAGE_SHIFT; 1287 int r; 1288 1289 do { 1290 /* get a page */ 1291 page = grab_cache_page_write_begin(mapping, index, 0); 1292 if (!page) 1293 return -ENOMEM; 1294 1295 dout("write_begin file %p inode %p page %p %d~%d\n", file, 1296 inode, page, (int)pos, (int)len); 1297 1298 r = ceph_update_writeable_page(file, pos, len, page); 1299 if (r < 0) 1300 put_page(page); 1301 else 1302 *pagep = page; 1303 } while (r == -EAGAIN); 1304 1305 return r; 1306 } 1307 1308 /* 1309 * we don't do anything in here that simple_write_end doesn't do 1310 * except adjust dirty page accounting 1311 */ 1312 static int ceph_write_end(struct file *file, struct address_space *mapping, 1313 loff_t pos, unsigned len, unsigned copied, 1314 struct page *page, void *fsdata) 1315 { 1316 struct inode *inode = file_inode(file); 1317 int check_cap = 0; 1318 1319 dout("write_end file %p inode %p page %p %d~%d (%d)\n", file, 1320 inode, page, (int)pos, (int)copied, (int)len); 1321 1322 /* zero the stale part of the page if we did a short copy */ 1323 if (!PageUptodate(page)) { 1324 if (copied < len) { 1325 copied = 0; 1326 goto out; 1327 } 1328 SetPageUptodate(page); 1329 } 1330 1331 /* did file size increase? */ 1332 if (pos+copied > i_size_read(inode)) 1333 check_cap = ceph_inode_set_size(inode, pos+copied); 1334 1335 set_page_dirty(page); 1336 1337 out: 1338 unlock_page(page); 1339 put_page(page); 1340 1341 if (check_cap) 1342 ceph_check_caps(ceph_inode(inode), CHECK_CAPS_AUTHONLY, NULL); 1343 1344 return copied; 1345 } 1346 1347 /* 1348 * we set .direct_IO to indicate direct io is supported, but since we 1349 * intercept O_DIRECT reads and writes early, this function should 1350 * never get called. 1351 */ 1352 static ssize_t ceph_direct_io(struct kiocb *iocb, struct iov_iter *iter) 1353 { 1354 WARN_ON(1); 1355 return -EINVAL; 1356 } 1357 1358 const struct address_space_operations ceph_aops = { 1359 .readpage = ceph_readpage, 1360 .readpages = ceph_readpages, 1361 .writepage = ceph_writepage, 1362 .writepages = ceph_writepages_start, 1363 .write_begin = ceph_write_begin, 1364 .write_end = ceph_write_end, 1365 .set_page_dirty = ceph_set_page_dirty, 1366 .invalidatepage = ceph_invalidatepage, 1367 .releasepage = ceph_releasepage, 1368 .direct_IO = ceph_direct_io, 1369 }; 1370 1371 static void ceph_block_sigs(sigset_t *oldset) 1372 { 1373 sigset_t mask; 1374 siginitsetinv(&mask, sigmask(SIGKILL)); 1375 sigprocmask(SIG_BLOCK, &mask, oldset); 1376 } 1377 1378 static void ceph_restore_sigs(sigset_t *oldset) 1379 { 1380 sigprocmask(SIG_SETMASK, oldset, NULL); 1381 } 1382 1383 /* 1384 * vm ops 1385 */ 1386 static int ceph_filemap_fault(struct vm_fault *vmf) 1387 { 1388 struct vm_area_struct *vma = vmf->vma; 1389 struct inode *inode = file_inode(vma->vm_file); 1390 struct ceph_inode_info *ci = ceph_inode(inode); 1391 struct ceph_file_info *fi = vma->vm_file->private_data; 1392 struct page *pinned_page = NULL; 1393 loff_t off = vmf->pgoff << PAGE_SHIFT; 1394 int want, got, ret; 1395 sigset_t oldset; 1396 1397 ceph_block_sigs(&oldset); 1398 1399 dout("filemap_fault %p %llx.%llx %llu~%zd trying to get caps\n", 1400 inode, ceph_vinop(inode), off, (size_t)PAGE_SIZE); 1401 if (fi->fmode & CEPH_FILE_MODE_LAZY) 1402 want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO; 1403 else 1404 want = CEPH_CAP_FILE_CACHE; 1405 1406 got = 0; 1407 ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, -1, &got, &pinned_page); 1408 if (ret < 0) 1409 goto out_restore; 1410 1411 dout("filemap_fault %p %llu~%zd got cap refs on %s\n", 1412 inode, off, (size_t)PAGE_SIZE, ceph_cap_string(got)); 1413 1414 if ((got & (CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO)) || 1415 ci->i_inline_version == CEPH_INLINE_NONE) { 1416 current->journal_info = vma->vm_file; 1417 ret = filemap_fault(vmf); 1418 current->journal_info = NULL; 1419 } else 1420 ret = -EAGAIN; 1421 1422 dout("filemap_fault %p %llu~%zd dropping cap refs on %s ret %d\n", 1423 inode, off, (size_t)PAGE_SIZE, ceph_cap_string(got), ret); 1424 if (pinned_page) 1425 put_page(pinned_page); 1426 ceph_put_cap_refs(ci, got); 1427 1428 if (ret != -EAGAIN) 1429 goto out_restore; 1430 1431 /* read inline data */ 1432 if (off >= PAGE_SIZE) { 1433 /* does not support inline data > PAGE_SIZE */ 1434 ret = VM_FAULT_SIGBUS; 1435 } else { 1436 int ret1; 1437 struct address_space *mapping = inode->i_mapping; 1438 struct page *page = find_or_create_page(mapping, 0, 1439 mapping_gfp_constraint(mapping, 1440 ~__GFP_FS)); 1441 if (!page) { 1442 ret = VM_FAULT_OOM; 1443 goto out_inline; 1444 } 1445 ret1 = __ceph_do_getattr(inode, page, 1446 CEPH_STAT_CAP_INLINE_DATA, true); 1447 if (ret1 < 0 || off >= i_size_read(inode)) { 1448 unlock_page(page); 1449 put_page(page); 1450 if (ret1 < 0) 1451 ret = ret1; 1452 else 1453 ret = VM_FAULT_SIGBUS; 1454 goto out_inline; 1455 } 1456 if (ret1 < PAGE_SIZE) 1457 zero_user_segment(page, ret1, PAGE_SIZE); 1458 else 1459 flush_dcache_page(page); 1460 SetPageUptodate(page); 1461 vmf->page = page; 1462 ret = VM_FAULT_MAJOR | VM_FAULT_LOCKED; 1463 out_inline: 1464 dout("filemap_fault %p %llu~%zd read inline data ret %d\n", 1465 inode, off, (size_t)PAGE_SIZE, ret); 1466 } 1467 out_restore: 1468 ceph_restore_sigs(&oldset); 1469 if (ret < 0) 1470 ret = (ret == -ENOMEM) ? VM_FAULT_OOM : VM_FAULT_SIGBUS; 1471 1472 return ret; 1473 } 1474 1475 /* 1476 * Reuse write_begin here for simplicity. 1477 */ 1478 static int ceph_page_mkwrite(struct vm_fault *vmf) 1479 { 1480 struct vm_area_struct *vma = vmf->vma; 1481 struct inode *inode = file_inode(vma->vm_file); 1482 struct ceph_inode_info *ci = ceph_inode(inode); 1483 struct ceph_file_info *fi = vma->vm_file->private_data; 1484 struct ceph_cap_flush *prealloc_cf; 1485 struct page *page = vmf->page; 1486 loff_t off = page_offset(page); 1487 loff_t size = i_size_read(inode); 1488 size_t len; 1489 int want, got, ret; 1490 sigset_t oldset; 1491 1492 prealloc_cf = ceph_alloc_cap_flush(); 1493 if (!prealloc_cf) 1494 return VM_FAULT_OOM; 1495 1496 ceph_block_sigs(&oldset); 1497 1498 if (ci->i_inline_version != CEPH_INLINE_NONE) { 1499 struct page *locked_page = NULL; 1500 if (off == 0) { 1501 lock_page(page); 1502 locked_page = page; 1503 } 1504 ret = ceph_uninline_data(vma->vm_file, locked_page); 1505 if (locked_page) 1506 unlock_page(locked_page); 1507 if (ret < 0) 1508 goto out_free; 1509 } 1510 1511 if (off + PAGE_SIZE <= size) 1512 len = PAGE_SIZE; 1513 else 1514 len = size & ~PAGE_MASK; 1515 1516 dout("page_mkwrite %p %llx.%llx %llu~%zd getting caps i_size %llu\n", 1517 inode, ceph_vinop(inode), off, len, size); 1518 if (fi->fmode & CEPH_FILE_MODE_LAZY) 1519 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO; 1520 else 1521 want = CEPH_CAP_FILE_BUFFER; 1522 1523 got = 0; 1524 ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, off + len, 1525 &got, NULL); 1526 if (ret < 0) 1527 goto out_free; 1528 1529 dout("page_mkwrite %p %llu~%zd got cap refs on %s\n", 1530 inode, off, len, ceph_cap_string(got)); 1531 1532 /* Update time before taking page lock */ 1533 file_update_time(vma->vm_file); 1534 1535 do { 1536 lock_page(page); 1537 1538 if ((off > size) || (page->mapping != inode->i_mapping)) { 1539 unlock_page(page); 1540 ret = VM_FAULT_NOPAGE; 1541 break; 1542 } 1543 1544 ret = ceph_update_writeable_page(vma->vm_file, off, len, page); 1545 if (ret >= 0) { 1546 /* success. we'll keep the page locked. */ 1547 set_page_dirty(page); 1548 ret = VM_FAULT_LOCKED; 1549 } 1550 } while (ret == -EAGAIN); 1551 1552 if (ret == VM_FAULT_LOCKED || 1553 ci->i_inline_version != CEPH_INLINE_NONE) { 1554 int dirty; 1555 spin_lock(&ci->i_ceph_lock); 1556 ci->i_inline_version = CEPH_INLINE_NONE; 1557 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR, 1558 &prealloc_cf); 1559 spin_unlock(&ci->i_ceph_lock); 1560 if (dirty) 1561 __mark_inode_dirty(inode, dirty); 1562 } 1563 1564 dout("page_mkwrite %p %llu~%zd dropping cap refs on %s ret %d\n", 1565 inode, off, len, ceph_cap_string(got), ret); 1566 ceph_put_cap_refs(ci, got); 1567 out_free: 1568 ceph_restore_sigs(&oldset); 1569 ceph_free_cap_flush(prealloc_cf); 1570 if (ret < 0) 1571 ret = (ret == -ENOMEM) ? VM_FAULT_OOM : VM_FAULT_SIGBUS; 1572 return ret; 1573 } 1574 1575 void ceph_fill_inline_data(struct inode *inode, struct page *locked_page, 1576 char *data, size_t len) 1577 { 1578 struct address_space *mapping = inode->i_mapping; 1579 struct page *page; 1580 1581 if (locked_page) { 1582 page = locked_page; 1583 } else { 1584 if (i_size_read(inode) == 0) 1585 return; 1586 page = find_or_create_page(mapping, 0, 1587 mapping_gfp_constraint(mapping, 1588 ~__GFP_FS)); 1589 if (!page) 1590 return; 1591 if (PageUptodate(page)) { 1592 unlock_page(page); 1593 put_page(page); 1594 return; 1595 } 1596 } 1597 1598 dout("fill_inline_data %p %llx.%llx len %zu locked_page %p\n", 1599 inode, ceph_vinop(inode), len, locked_page); 1600 1601 if (len > 0) { 1602 void *kaddr = kmap_atomic(page); 1603 memcpy(kaddr, data, len); 1604 kunmap_atomic(kaddr); 1605 } 1606 1607 if (page != locked_page) { 1608 if (len < PAGE_SIZE) 1609 zero_user_segment(page, len, PAGE_SIZE); 1610 else 1611 flush_dcache_page(page); 1612 1613 SetPageUptodate(page); 1614 unlock_page(page); 1615 put_page(page); 1616 } 1617 } 1618 1619 int ceph_uninline_data(struct file *filp, struct page *locked_page) 1620 { 1621 struct inode *inode = file_inode(filp); 1622 struct ceph_inode_info *ci = ceph_inode(inode); 1623 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 1624 struct ceph_osd_request *req; 1625 struct page *page = NULL; 1626 u64 len, inline_version; 1627 int err = 0; 1628 bool from_pagecache = false; 1629 1630 spin_lock(&ci->i_ceph_lock); 1631 inline_version = ci->i_inline_version; 1632 spin_unlock(&ci->i_ceph_lock); 1633 1634 dout("uninline_data %p %llx.%llx inline_version %llu\n", 1635 inode, ceph_vinop(inode), inline_version); 1636 1637 if (inline_version == 1 || /* initial version, no data */ 1638 inline_version == CEPH_INLINE_NONE) 1639 goto out; 1640 1641 if (locked_page) { 1642 page = locked_page; 1643 WARN_ON(!PageUptodate(page)); 1644 } else if (ceph_caps_issued(ci) & 1645 (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) { 1646 page = find_get_page(inode->i_mapping, 0); 1647 if (page) { 1648 if (PageUptodate(page)) { 1649 from_pagecache = true; 1650 lock_page(page); 1651 } else { 1652 put_page(page); 1653 page = NULL; 1654 } 1655 } 1656 } 1657 1658 if (page) { 1659 len = i_size_read(inode); 1660 if (len > PAGE_SIZE) 1661 len = PAGE_SIZE; 1662 } else { 1663 page = __page_cache_alloc(GFP_NOFS); 1664 if (!page) { 1665 err = -ENOMEM; 1666 goto out; 1667 } 1668 err = __ceph_do_getattr(inode, page, 1669 CEPH_STAT_CAP_INLINE_DATA, true); 1670 if (err < 0) { 1671 /* no inline data */ 1672 if (err == -ENODATA) 1673 err = 0; 1674 goto out; 1675 } 1676 len = err; 1677 } 1678 1679 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, 1680 ceph_vino(inode), 0, &len, 0, 1, 1681 CEPH_OSD_OP_CREATE, CEPH_OSD_FLAG_WRITE, 1682 NULL, 0, 0, false); 1683 if (IS_ERR(req)) { 1684 err = PTR_ERR(req); 1685 goto out; 1686 } 1687 1688 req->r_mtime = inode->i_mtime; 1689 err = ceph_osdc_start_request(&fsc->client->osdc, req, false); 1690 if (!err) 1691 err = ceph_osdc_wait_request(&fsc->client->osdc, req); 1692 ceph_osdc_put_request(req); 1693 if (err < 0) 1694 goto out; 1695 1696 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, 1697 ceph_vino(inode), 0, &len, 1, 3, 1698 CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE, 1699 NULL, ci->i_truncate_seq, 1700 ci->i_truncate_size, false); 1701 if (IS_ERR(req)) { 1702 err = PTR_ERR(req); 1703 goto out; 1704 } 1705 1706 osd_req_op_extent_osd_data_pages(req, 1, &page, len, 0, false, false); 1707 1708 { 1709 __le64 xattr_buf = cpu_to_le64(inline_version); 1710 err = osd_req_op_xattr_init(req, 0, CEPH_OSD_OP_CMPXATTR, 1711 "inline_version", &xattr_buf, 1712 sizeof(xattr_buf), 1713 CEPH_OSD_CMPXATTR_OP_GT, 1714 CEPH_OSD_CMPXATTR_MODE_U64); 1715 if (err) 1716 goto out_put; 1717 } 1718 1719 { 1720 char xattr_buf[32]; 1721 int xattr_len = snprintf(xattr_buf, sizeof(xattr_buf), 1722 "%llu", inline_version); 1723 err = osd_req_op_xattr_init(req, 2, CEPH_OSD_OP_SETXATTR, 1724 "inline_version", 1725 xattr_buf, xattr_len, 0, 0); 1726 if (err) 1727 goto out_put; 1728 } 1729 1730 req->r_mtime = inode->i_mtime; 1731 err = ceph_osdc_start_request(&fsc->client->osdc, req, false); 1732 if (!err) 1733 err = ceph_osdc_wait_request(&fsc->client->osdc, req); 1734 out_put: 1735 ceph_osdc_put_request(req); 1736 if (err == -ECANCELED) 1737 err = 0; 1738 out: 1739 if (page && page != locked_page) { 1740 if (from_pagecache) { 1741 unlock_page(page); 1742 put_page(page); 1743 } else 1744 __free_pages(page, 0); 1745 } 1746 1747 dout("uninline_data %p %llx.%llx inline_version %llu = %d\n", 1748 inode, ceph_vinop(inode), inline_version, err); 1749 return err; 1750 } 1751 1752 static const struct vm_operations_struct ceph_vmops = { 1753 .fault = ceph_filemap_fault, 1754 .page_mkwrite = ceph_page_mkwrite, 1755 }; 1756 1757 int ceph_mmap(struct file *file, struct vm_area_struct *vma) 1758 { 1759 struct address_space *mapping = file->f_mapping; 1760 1761 if (!mapping->a_ops->readpage) 1762 return -ENOEXEC; 1763 file_accessed(file); 1764 vma->vm_ops = &ceph_vmops; 1765 return 0; 1766 } 1767 1768 enum { 1769 POOL_READ = 1, 1770 POOL_WRITE = 2, 1771 }; 1772 1773 static int __ceph_pool_perm_get(struct ceph_inode_info *ci, 1774 s64 pool, struct ceph_string *pool_ns) 1775 { 1776 struct ceph_fs_client *fsc = ceph_inode_to_client(&ci->vfs_inode); 1777 struct ceph_mds_client *mdsc = fsc->mdsc; 1778 struct ceph_osd_request *rd_req = NULL, *wr_req = NULL; 1779 struct rb_node **p, *parent; 1780 struct ceph_pool_perm *perm; 1781 struct page **pages; 1782 size_t pool_ns_len; 1783 int err = 0, err2 = 0, have = 0; 1784 1785 down_read(&mdsc->pool_perm_rwsem); 1786 p = &mdsc->pool_perm_tree.rb_node; 1787 while (*p) { 1788 perm = rb_entry(*p, struct ceph_pool_perm, node); 1789 if (pool < perm->pool) 1790 p = &(*p)->rb_left; 1791 else if (pool > perm->pool) 1792 p = &(*p)->rb_right; 1793 else { 1794 int ret = ceph_compare_string(pool_ns, 1795 perm->pool_ns, 1796 perm->pool_ns_len); 1797 if (ret < 0) 1798 p = &(*p)->rb_left; 1799 else if (ret > 0) 1800 p = &(*p)->rb_right; 1801 else { 1802 have = perm->perm; 1803 break; 1804 } 1805 } 1806 } 1807 up_read(&mdsc->pool_perm_rwsem); 1808 if (*p) 1809 goto out; 1810 1811 if (pool_ns) 1812 dout("__ceph_pool_perm_get pool %lld ns %.*s no perm cached\n", 1813 pool, (int)pool_ns->len, pool_ns->str); 1814 else 1815 dout("__ceph_pool_perm_get pool %lld no perm cached\n", pool); 1816 1817 down_write(&mdsc->pool_perm_rwsem); 1818 p = &mdsc->pool_perm_tree.rb_node; 1819 parent = NULL; 1820 while (*p) { 1821 parent = *p; 1822 perm = rb_entry(parent, struct ceph_pool_perm, node); 1823 if (pool < perm->pool) 1824 p = &(*p)->rb_left; 1825 else if (pool > perm->pool) 1826 p = &(*p)->rb_right; 1827 else { 1828 int ret = ceph_compare_string(pool_ns, 1829 perm->pool_ns, 1830 perm->pool_ns_len); 1831 if (ret < 0) 1832 p = &(*p)->rb_left; 1833 else if (ret > 0) 1834 p = &(*p)->rb_right; 1835 else { 1836 have = perm->perm; 1837 break; 1838 } 1839 } 1840 } 1841 if (*p) { 1842 up_write(&mdsc->pool_perm_rwsem); 1843 goto out; 1844 } 1845 1846 rd_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL, 1847 1, false, GFP_NOFS); 1848 if (!rd_req) { 1849 err = -ENOMEM; 1850 goto out_unlock; 1851 } 1852 1853 rd_req->r_flags = CEPH_OSD_FLAG_READ; 1854 osd_req_op_init(rd_req, 0, CEPH_OSD_OP_STAT, 0); 1855 rd_req->r_base_oloc.pool = pool; 1856 if (pool_ns) 1857 rd_req->r_base_oloc.pool_ns = ceph_get_string(pool_ns); 1858 ceph_oid_printf(&rd_req->r_base_oid, "%llx.00000000", ci->i_vino.ino); 1859 1860 err = ceph_osdc_alloc_messages(rd_req, GFP_NOFS); 1861 if (err) 1862 goto out_unlock; 1863 1864 wr_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL, 1865 1, false, GFP_NOFS); 1866 if (!wr_req) { 1867 err = -ENOMEM; 1868 goto out_unlock; 1869 } 1870 1871 wr_req->r_flags = CEPH_OSD_FLAG_WRITE; 1872 osd_req_op_init(wr_req, 0, CEPH_OSD_OP_CREATE, CEPH_OSD_OP_FLAG_EXCL); 1873 ceph_oloc_copy(&wr_req->r_base_oloc, &rd_req->r_base_oloc); 1874 ceph_oid_copy(&wr_req->r_base_oid, &rd_req->r_base_oid); 1875 1876 err = ceph_osdc_alloc_messages(wr_req, GFP_NOFS); 1877 if (err) 1878 goto out_unlock; 1879 1880 /* one page should be large enough for STAT data */ 1881 pages = ceph_alloc_page_vector(1, GFP_KERNEL); 1882 if (IS_ERR(pages)) { 1883 err = PTR_ERR(pages); 1884 goto out_unlock; 1885 } 1886 1887 osd_req_op_raw_data_in_pages(rd_req, 0, pages, PAGE_SIZE, 1888 0, false, true); 1889 err = ceph_osdc_start_request(&fsc->client->osdc, rd_req, false); 1890 1891 wr_req->r_mtime = ci->vfs_inode.i_mtime; 1892 wr_req->r_abort_on_full = true; 1893 err2 = ceph_osdc_start_request(&fsc->client->osdc, wr_req, false); 1894 1895 if (!err) 1896 err = ceph_osdc_wait_request(&fsc->client->osdc, rd_req); 1897 if (!err2) 1898 err2 = ceph_osdc_wait_request(&fsc->client->osdc, wr_req); 1899 1900 if (err >= 0 || err == -ENOENT) 1901 have |= POOL_READ; 1902 else if (err != -EPERM) 1903 goto out_unlock; 1904 1905 if (err2 == 0 || err2 == -EEXIST) 1906 have |= POOL_WRITE; 1907 else if (err2 != -EPERM) { 1908 err = err2; 1909 goto out_unlock; 1910 } 1911 1912 pool_ns_len = pool_ns ? pool_ns->len : 0; 1913 perm = kmalloc(sizeof(*perm) + pool_ns_len + 1, GFP_NOFS); 1914 if (!perm) { 1915 err = -ENOMEM; 1916 goto out_unlock; 1917 } 1918 1919 perm->pool = pool; 1920 perm->perm = have; 1921 perm->pool_ns_len = pool_ns_len; 1922 if (pool_ns_len > 0) 1923 memcpy(perm->pool_ns, pool_ns->str, pool_ns_len); 1924 perm->pool_ns[pool_ns_len] = 0; 1925 1926 rb_link_node(&perm->node, parent, p); 1927 rb_insert_color(&perm->node, &mdsc->pool_perm_tree); 1928 err = 0; 1929 out_unlock: 1930 up_write(&mdsc->pool_perm_rwsem); 1931 1932 ceph_osdc_put_request(rd_req); 1933 ceph_osdc_put_request(wr_req); 1934 out: 1935 if (!err) 1936 err = have; 1937 if (pool_ns) 1938 dout("__ceph_pool_perm_get pool %lld ns %.*s result = %d\n", 1939 pool, (int)pool_ns->len, pool_ns->str, err); 1940 else 1941 dout("__ceph_pool_perm_get pool %lld result = %d\n", pool, err); 1942 return err; 1943 } 1944 1945 int ceph_pool_perm_check(struct ceph_inode_info *ci, int need) 1946 { 1947 s64 pool; 1948 struct ceph_string *pool_ns; 1949 int ret, flags; 1950 1951 if (ci->i_vino.snap != CEPH_NOSNAP) { 1952 /* 1953 * Pool permission check needs to write to the first object. 1954 * But for snapshot, head of the first object may have alread 1955 * been deleted. Skip check to avoid creating orphan object. 1956 */ 1957 return 0; 1958 } 1959 1960 if (ceph_test_mount_opt(ceph_inode_to_client(&ci->vfs_inode), 1961 NOPOOLPERM)) 1962 return 0; 1963 1964 spin_lock(&ci->i_ceph_lock); 1965 flags = ci->i_ceph_flags; 1966 pool = ci->i_layout.pool_id; 1967 spin_unlock(&ci->i_ceph_lock); 1968 check: 1969 if (flags & CEPH_I_POOL_PERM) { 1970 if ((need & CEPH_CAP_FILE_RD) && !(flags & CEPH_I_POOL_RD)) { 1971 dout("ceph_pool_perm_check pool %lld no read perm\n", 1972 pool); 1973 return -EPERM; 1974 } 1975 if ((need & CEPH_CAP_FILE_WR) && !(flags & CEPH_I_POOL_WR)) { 1976 dout("ceph_pool_perm_check pool %lld no write perm\n", 1977 pool); 1978 return -EPERM; 1979 } 1980 return 0; 1981 } 1982 1983 pool_ns = ceph_try_get_string(ci->i_layout.pool_ns); 1984 ret = __ceph_pool_perm_get(ci, pool, pool_ns); 1985 ceph_put_string(pool_ns); 1986 if (ret < 0) 1987 return ret; 1988 1989 flags = CEPH_I_POOL_PERM; 1990 if (ret & POOL_READ) 1991 flags |= CEPH_I_POOL_RD; 1992 if (ret & POOL_WRITE) 1993 flags |= CEPH_I_POOL_WR; 1994 1995 spin_lock(&ci->i_ceph_lock); 1996 if (pool == ci->i_layout.pool_id && 1997 pool_ns == rcu_dereference_raw(ci->i_layout.pool_ns)) { 1998 ci->i_ceph_flags |= flags; 1999 } else { 2000 pool = ci->i_layout.pool_id; 2001 flags = ci->i_ceph_flags; 2002 } 2003 spin_unlock(&ci->i_ceph_lock); 2004 goto check; 2005 } 2006 2007 void ceph_pool_perm_destroy(struct ceph_mds_client *mdsc) 2008 { 2009 struct ceph_pool_perm *perm; 2010 struct rb_node *n; 2011 2012 while (!RB_EMPTY_ROOT(&mdsc->pool_perm_tree)) { 2013 n = rb_first(&mdsc->pool_perm_tree); 2014 perm = rb_entry(n, struct ceph_pool_perm, node); 2015 rb_erase(n, &mdsc->pool_perm_tree); 2016 kfree(perm); 2017 } 2018 } 2019