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 ceph_do_readpage(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 return -EINPROGRESS; 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 = ceph_do_readpage(filp, page); 253 if (r != -EINPROGRESS) 254 unlock_page(page); 255 else 256 r = 0; 257 return r; 258 } 259 260 /* 261 * Finish an async read(ahead) op. 262 */ 263 static void finish_read(struct ceph_osd_request *req) 264 { 265 struct inode *inode = req->r_inode; 266 struct ceph_osd_data *osd_data; 267 int rc = req->r_result <= 0 ? req->r_result : 0; 268 int bytes = req->r_result >= 0 ? req->r_result : 0; 269 int num_pages; 270 int i; 271 272 dout("finish_read %p req %p rc %d bytes %d\n", inode, req, rc, bytes); 273 274 /* unlock all pages, zeroing any data we didn't read */ 275 osd_data = osd_req_op_extent_osd_data(req, 0); 276 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES); 277 num_pages = calc_pages_for((u64)osd_data->alignment, 278 (u64)osd_data->length); 279 for (i = 0; i < num_pages; i++) { 280 struct page *page = osd_data->pages[i]; 281 282 if (rc < 0 && rc != -ENOENT) { 283 ceph_fscache_readpage_cancel(inode, page); 284 goto unlock; 285 } 286 if (bytes < (int)PAGE_SIZE) { 287 /* zero (remainder of) page */ 288 int s = bytes < 0 ? 0 : bytes; 289 zero_user_segment(page, s, PAGE_SIZE); 290 } 291 dout("finish_read %p uptodate %p idx %lu\n", inode, page, 292 page->index); 293 flush_dcache_page(page); 294 SetPageUptodate(page); 295 ceph_readpage_to_fscache(inode, page); 296 unlock: 297 unlock_page(page); 298 put_page(page); 299 bytes -= PAGE_SIZE; 300 } 301 kfree(osd_data->pages); 302 } 303 304 /* 305 * start an async read(ahead) operation. return nr_pages we submitted 306 * a read for on success, or negative error code. 307 */ 308 static int start_read(struct inode *inode, struct list_head *page_list, int max) 309 { 310 struct ceph_osd_client *osdc = 311 &ceph_inode_to_client(inode)->client->osdc; 312 struct ceph_inode_info *ci = ceph_inode(inode); 313 struct page *page = list_entry(page_list->prev, struct page, lru); 314 struct ceph_vino vino; 315 struct ceph_osd_request *req; 316 u64 off; 317 u64 len; 318 int i; 319 struct page **pages; 320 pgoff_t next_index; 321 int nr_pages = 0; 322 int got = 0; 323 int ret = 0; 324 325 if (!current->journal_info) { 326 /* caller of readpages does not hold buffer and read caps 327 * (fadvise, madvise and readahead cases) */ 328 int want = CEPH_CAP_FILE_CACHE; 329 ret = ceph_try_get_caps(ci, CEPH_CAP_FILE_RD, want, &got); 330 if (ret < 0) { 331 dout("start_read %p, error getting cap\n", inode); 332 } else if (!(got & want)) { 333 dout("start_read %p, no cache cap\n", inode); 334 ret = 0; 335 } 336 if (ret <= 0) { 337 if (got) 338 ceph_put_cap_refs(ci, got); 339 while (!list_empty(page_list)) { 340 page = list_entry(page_list->prev, 341 struct page, lru); 342 list_del(&page->lru); 343 put_page(page); 344 } 345 return ret; 346 } 347 } 348 349 off = (u64) page_offset(page); 350 351 /* count pages */ 352 next_index = page->index; 353 list_for_each_entry_reverse(page, page_list, lru) { 354 if (page->index != next_index) 355 break; 356 nr_pages++; 357 next_index++; 358 if (max && nr_pages == max) 359 break; 360 } 361 len = nr_pages << PAGE_SHIFT; 362 dout("start_read %p nr_pages %d is %lld~%lld\n", inode, nr_pages, 363 off, len); 364 vino = ceph_vino(inode); 365 req = ceph_osdc_new_request(osdc, &ci->i_layout, vino, off, &len, 366 0, 1, CEPH_OSD_OP_READ, 367 CEPH_OSD_FLAG_READ, NULL, 368 ci->i_truncate_seq, ci->i_truncate_size, 369 false); 370 if (IS_ERR(req)) { 371 ret = PTR_ERR(req); 372 goto out; 373 } 374 375 /* build page vector */ 376 nr_pages = calc_pages_for(0, len); 377 pages = kmalloc(sizeof(*pages) * nr_pages, GFP_KERNEL); 378 if (!pages) { 379 ret = -ENOMEM; 380 goto out_put; 381 } 382 for (i = 0; i < nr_pages; ++i) { 383 page = list_entry(page_list->prev, struct page, lru); 384 BUG_ON(PageLocked(page)); 385 list_del(&page->lru); 386 387 dout("start_read %p adding %p idx %lu\n", inode, page, 388 page->index); 389 if (add_to_page_cache_lru(page, &inode->i_data, page->index, 390 GFP_KERNEL)) { 391 ceph_fscache_uncache_page(inode, page); 392 put_page(page); 393 dout("start_read %p add_to_page_cache failed %p\n", 394 inode, page); 395 nr_pages = i; 396 if (nr_pages > 0) { 397 len = nr_pages << PAGE_SHIFT; 398 osd_req_op_extent_update(req, 0, len); 399 break; 400 } 401 goto out_pages; 402 } 403 pages[i] = page; 404 } 405 osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0, false, false); 406 req->r_callback = finish_read; 407 req->r_inode = inode; 408 409 dout("start_read %p starting %p %lld~%lld\n", inode, req, off, len); 410 ret = ceph_osdc_start_request(osdc, req, false); 411 if (ret < 0) 412 goto out_pages; 413 ceph_osdc_put_request(req); 414 415 /* After adding locked pages to page cache, the inode holds cache cap. 416 * So we can drop our cap refs. */ 417 if (got) 418 ceph_put_cap_refs(ci, got); 419 420 return nr_pages; 421 422 out_pages: 423 for (i = 0; i < nr_pages; ++i) { 424 ceph_fscache_readpage_cancel(inode, pages[i]); 425 unlock_page(pages[i]); 426 } 427 ceph_put_page_vector(pages, nr_pages, false); 428 out_put: 429 ceph_osdc_put_request(req); 430 out: 431 if (got) 432 ceph_put_cap_refs(ci, got); 433 return ret; 434 } 435 436 437 /* 438 * Read multiple pages. Leave pages we don't read + unlock in page_list; 439 * the caller (VM) cleans them up. 440 */ 441 static int ceph_readpages(struct file *file, struct address_space *mapping, 442 struct list_head *page_list, unsigned nr_pages) 443 { 444 struct inode *inode = file_inode(file); 445 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 446 int rc = 0; 447 int max = 0; 448 449 if (ceph_inode(inode)->i_inline_version != CEPH_INLINE_NONE) 450 return -EINVAL; 451 452 rc = ceph_readpages_from_fscache(mapping->host, mapping, page_list, 453 &nr_pages); 454 455 if (rc == 0) 456 goto out; 457 458 max = fsc->mount_options->rsize >> PAGE_SHIFT; 459 dout("readpages %p file %p nr_pages %d max %d\n", 460 inode, file, nr_pages, max); 461 while (!list_empty(page_list)) { 462 rc = start_read(inode, page_list, max); 463 if (rc < 0) 464 goto out; 465 } 466 out: 467 ceph_fscache_readpages_cancel(inode, page_list); 468 469 dout("readpages %p file %p ret %d\n", inode, file, rc); 470 return rc; 471 } 472 473 /* 474 * Get ref for the oldest snapc for an inode with dirty data... that is, the 475 * only snap context we are allowed to write back. 476 */ 477 static struct ceph_snap_context *get_oldest_context(struct inode *inode, 478 loff_t *snap_size, 479 u64 *truncate_size, 480 u32 *truncate_seq) 481 { 482 struct ceph_inode_info *ci = ceph_inode(inode); 483 struct ceph_snap_context *snapc = NULL; 484 struct ceph_cap_snap *capsnap = NULL; 485 486 spin_lock(&ci->i_ceph_lock); 487 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) { 488 dout(" cap_snap %p snapc %p has %d dirty pages\n", capsnap, 489 capsnap->context, capsnap->dirty_pages); 490 if (capsnap->dirty_pages) { 491 snapc = ceph_get_snap_context(capsnap->context); 492 if (snap_size) 493 *snap_size = capsnap->size; 494 if (truncate_size) 495 *truncate_size = capsnap->truncate_size; 496 if (truncate_seq) 497 *truncate_seq = capsnap->truncate_seq; 498 break; 499 } 500 } 501 if (!snapc && ci->i_wrbuffer_ref_head) { 502 snapc = ceph_get_snap_context(ci->i_head_snapc); 503 dout(" head snapc %p has %d dirty pages\n", 504 snapc, ci->i_wrbuffer_ref_head); 505 if (truncate_size) 506 *truncate_size = ci->i_truncate_size; 507 if (truncate_seq) 508 *truncate_seq = ci->i_truncate_seq; 509 } 510 spin_unlock(&ci->i_ceph_lock); 511 return snapc; 512 } 513 514 /* 515 * Write a single page, but leave the page locked. 516 * 517 * If we get a write error, set the page error bit, but still adjust the 518 * dirty page accounting (i.e., page is no longer dirty). 519 */ 520 static int writepage_nounlock(struct page *page, struct writeback_control *wbc) 521 { 522 struct inode *inode; 523 struct ceph_inode_info *ci; 524 struct ceph_fs_client *fsc; 525 struct ceph_osd_client *osdc; 526 struct ceph_snap_context *snapc, *oldest; 527 loff_t page_off = page_offset(page); 528 loff_t snap_size = -1; 529 long writeback_stat; 530 u64 truncate_size; 531 u32 truncate_seq; 532 int err, len = PAGE_SIZE; 533 534 dout("writepage %p idx %lu\n", page, page->index); 535 536 inode = page->mapping->host; 537 ci = ceph_inode(inode); 538 fsc = ceph_inode_to_client(inode); 539 osdc = &fsc->client->osdc; 540 541 /* verify this is a writeable snap context */ 542 snapc = page_snap_context(page); 543 if (snapc == NULL) { 544 dout("writepage %p page %p not dirty?\n", inode, page); 545 return 0; 546 } 547 oldest = get_oldest_context(inode, &snap_size, 548 &truncate_size, &truncate_seq); 549 if (snapc->seq > oldest->seq) { 550 dout("writepage %p page %p snapc %p not writeable - noop\n", 551 inode, page, snapc); 552 /* we should only noop if called by kswapd */ 553 WARN_ON(!(current->flags & PF_MEMALLOC)); 554 ceph_put_snap_context(oldest); 555 redirty_page_for_writepage(wbc, page); 556 return 0; 557 } 558 ceph_put_snap_context(oldest); 559 560 if (snap_size == -1) 561 snap_size = i_size_read(inode); 562 563 /* is this a partial page at end of file? */ 564 if (page_off >= snap_size) { 565 dout("%p page eof %llu\n", page, snap_size); 566 return 0; 567 } 568 569 if (snap_size < page_off + len) 570 len = snap_size - page_off; 571 572 dout("writepage %p page %p index %lu on %llu~%u snapc %p\n", 573 inode, page, page->index, page_off, len, snapc); 574 575 writeback_stat = atomic_long_inc_return(&fsc->writeback_count); 576 if (writeback_stat > 577 CONGESTION_ON_THRESH(fsc->mount_options->congestion_kb)) 578 set_bdi_congested(inode_to_bdi(inode), BLK_RW_ASYNC); 579 580 set_page_writeback(page); 581 err = ceph_osdc_writepages(osdc, ceph_vino(inode), 582 &ci->i_layout, snapc, 583 page_off, len, 584 truncate_seq, truncate_size, 585 &inode->i_mtime, &page, 1); 586 if (err < 0) { 587 struct writeback_control tmp_wbc; 588 if (!wbc) 589 wbc = &tmp_wbc; 590 if (err == -ERESTARTSYS) { 591 /* killed by SIGKILL */ 592 dout("writepage interrupted page %p\n", page); 593 redirty_page_for_writepage(wbc, page); 594 end_page_writeback(page); 595 return err; 596 } 597 dout("writepage setting page/mapping error %d %p\n", 598 err, page); 599 SetPageError(page); 600 mapping_set_error(&inode->i_data, err); 601 wbc->pages_skipped++; 602 } else { 603 dout("writepage cleaned page %p\n", page); 604 err = 0; /* vfs expects us to return 0 */ 605 } 606 page->private = 0; 607 ClearPagePrivate(page); 608 end_page_writeback(page); 609 ceph_put_wrbuffer_cap_refs(ci, 1, snapc); 610 ceph_put_snap_context(snapc); /* page's reference */ 611 return err; 612 } 613 614 static int ceph_writepage(struct page *page, struct writeback_control *wbc) 615 { 616 int err; 617 struct inode *inode = page->mapping->host; 618 BUG_ON(!inode); 619 ihold(inode); 620 err = writepage_nounlock(page, wbc); 621 if (err == -ERESTARTSYS) { 622 /* direct memory reclaimer was killed by SIGKILL. return 0 623 * to prevent caller from setting mapping/page error */ 624 err = 0; 625 } 626 unlock_page(page); 627 iput(inode); 628 return err; 629 } 630 631 /* 632 * lame release_pages helper. release_pages() isn't exported to 633 * modules. 634 */ 635 static void ceph_release_pages(struct page **pages, int num) 636 { 637 struct pagevec pvec; 638 int i; 639 640 pagevec_init(&pvec, 0); 641 for (i = 0; i < num; i++) { 642 if (pagevec_add(&pvec, pages[i]) == 0) 643 pagevec_release(&pvec); 644 } 645 pagevec_release(&pvec); 646 } 647 648 /* 649 * async writeback completion handler. 650 * 651 * If we get an error, set the mapping error bit, but not the individual 652 * page error bits. 653 */ 654 static void writepages_finish(struct ceph_osd_request *req) 655 { 656 struct inode *inode = req->r_inode; 657 struct ceph_inode_info *ci = ceph_inode(inode); 658 struct ceph_osd_data *osd_data; 659 struct page *page; 660 int num_pages, total_pages = 0; 661 int i, j; 662 int rc = req->r_result; 663 struct ceph_snap_context *snapc = req->r_snapc; 664 struct address_space *mapping = inode->i_mapping; 665 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 666 bool remove_page; 667 668 dout("writepages_finish %p rc %d\n", inode, rc); 669 if (rc < 0) { 670 mapping_set_error(mapping, rc); 671 ceph_set_error_write(ci); 672 } else { 673 ceph_clear_error_write(ci); 674 } 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(inode_to_bdi(inode), 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(inode_to_bdi(inode), 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_unlock; 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 = ceph_do_readpage(file, page); 1268 if (r < 0) { 1269 if (r == -EINPROGRESS) 1270 return -EAGAIN; 1271 goto fail_unlock; 1272 } 1273 goto retry_locked; 1274 fail_unlock: 1275 unlock_page(page); 1276 return r; 1277 } 1278 1279 /* 1280 * We are only allowed to write into/dirty the page if the page is 1281 * clean, or already dirty within the same snap context. 1282 */ 1283 static int ceph_write_begin(struct file *file, struct address_space *mapping, 1284 loff_t pos, unsigned len, unsigned flags, 1285 struct page **pagep, void **fsdata) 1286 { 1287 struct inode *inode = file_inode(file); 1288 struct page *page; 1289 pgoff_t index = pos >> PAGE_SHIFT; 1290 int r; 1291 1292 do { 1293 /* get a page */ 1294 page = grab_cache_page_write_begin(mapping, index, 0); 1295 if (!page) 1296 return -ENOMEM; 1297 1298 dout("write_begin file %p inode %p page %p %d~%d\n", file, 1299 inode, page, (int)pos, (int)len); 1300 1301 r = ceph_update_writeable_page(file, pos, len, page); 1302 if (r < 0) 1303 put_page(page); 1304 else 1305 *pagep = page; 1306 } while (r == -EAGAIN); 1307 1308 return r; 1309 } 1310 1311 /* 1312 * we don't do anything in here that simple_write_end doesn't do 1313 * except adjust dirty page accounting 1314 */ 1315 static int ceph_write_end(struct file *file, struct address_space *mapping, 1316 loff_t pos, unsigned len, unsigned copied, 1317 struct page *page, void *fsdata) 1318 { 1319 struct inode *inode = file_inode(file); 1320 bool check_cap = false; 1321 1322 dout("write_end file %p inode %p page %p %d~%d (%d)\n", file, 1323 inode, page, (int)pos, (int)copied, (int)len); 1324 1325 /* zero the stale part of the page if we did a short copy */ 1326 if (!PageUptodate(page)) { 1327 if (copied < len) { 1328 copied = 0; 1329 goto out; 1330 } 1331 SetPageUptodate(page); 1332 } 1333 1334 /* did file size increase? */ 1335 if (pos+copied > i_size_read(inode)) 1336 check_cap = ceph_inode_set_size(inode, pos+copied); 1337 1338 set_page_dirty(page); 1339 1340 out: 1341 unlock_page(page); 1342 put_page(page); 1343 1344 if (check_cap) 1345 ceph_check_caps(ceph_inode(inode), CHECK_CAPS_AUTHONLY, NULL); 1346 1347 return copied; 1348 } 1349 1350 /* 1351 * we set .direct_IO to indicate direct io is supported, but since we 1352 * intercept O_DIRECT reads and writes early, this function should 1353 * never get called. 1354 */ 1355 static ssize_t ceph_direct_io(struct kiocb *iocb, struct iov_iter *iter) 1356 { 1357 WARN_ON(1); 1358 return -EINVAL; 1359 } 1360 1361 const struct address_space_operations ceph_aops = { 1362 .readpage = ceph_readpage, 1363 .readpages = ceph_readpages, 1364 .writepage = ceph_writepage, 1365 .writepages = ceph_writepages_start, 1366 .write_begin = ceph_write_begin, 1367 .write_end = ceph_write_end, 1368 .set_page_dirty = ceph_set_page_dirty, 1369 .invalidatepage = ceph_invalidatepage, 1370 .releasepage = ceph_releasepage, 1371 .direct_IO = ceph_direct_io, 1372 }; 1373 1374 static void ceph_block_sigs(sigset_t *oldset) 1375 { 1376 sigset_t mask; 1377 siginitsetinv(&mask, sigmask(SIGKILL)); 1378 sigprocmask(SIG_BLOCK, &mask, oldset); 1379 } 1380 1381 static void ceph_restore_sigs(sigset_t *oldset) 1382 { 1383 sigprocmask(SIG_SETMASK, oldset, NULL); 1384 } 1385 1386 /* 1387 * vm ops 1388 */ 1389 static int ceph_filemap_fault(struct vm_fault *vmf) 1390 { 1391 struct vm_area_struct *vma = vmf->vma; 1392 struct inode *inode = file_inode(vma->vm_file); 1393 struct ceph_inode_info *ci = ceph_inode(inode); 1394 struct ceph_file_info *fi = vma->vm_file->private_data; 1395 struct page *pinned_page = NULL; 1396 loff_t off = vmf->pgoff << PAGE_SHIFT; 1397 int want, got, ret; 1398 sigset_t oldset; 1399 1400 ceph_block_sigs(&oldset); 1401 1402 dout("filemap_fault %p %llx.%llx %llu~%zd trying to get caps\n", 1403 inode, ceph_vinop(inode), off, (size_t)PAGE_SIZE); 1404 if (fi->fmode & CEPH_FILE_MODE_LAZY) 1405 want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO; 1406 else 1407 want = CEPH_CAP_FILE_CACHE; 1408 1409 got = 0; 1410 ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, -1, &got, &pinned_page); 1411 if (ret < 0) 1412 goto out_restore; 1413 1414 dout("filemap_fault %p %llu~%zd got cap refs on %s\n", 1415 inode, off, (size_t)PAGE_SIZE, ceph_cap_string(got)); 1416 1417 if ((got & (CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO)) || 1418 ci->i_inline_version == CEPH_INLINE_NONE) { 1419 current->journal_info = vma->vm_file; 1420 ret = filemap_fault(vmf); 1421 current->journal_info = NULL; 1422 } else 1423 ret = -EAGAIN; 1424 1425 dout("filemap_fault %p %llu~%zd dropping cap refs on %s ret %d\n", 1426 inode, off, (size_t)PAGE_SIZE, ceph_cap_string(got), ret); 1427 if (pinned_page) 1428 put_page(pinned_page); 1429 ceph_put_cap_refs(ci, got); 1430 1431 if (ret != -EAGAIN) 1432 goto out_restore; 1433 1434 /* read inline data */ 1435 if (off >= PAGE_SIZE) { 1436 /* does not support inline data > PAGE_SIZE */ 1437 ret = VM_FAULT_SIGBUS; 1438 } else { 1439 int ret1; 1440 struct address_space *mapping = inode->i_mapping; 1441 struct page *page = find_or_create_page(mapping, 0, 1442 mapping_gfp_constraint(mapping, 1443 ~__GFP_FS)); 1444 if (!page) { 1445 ret = VM_FAULT_OOM; 1446 goto out_inline; 1447 } 1448 ret1 = __ceph_do_getattr(inode, page, 1449 CEPH_STAT_CAP_INLINE_DATA, true); 1450 if (ret1 < 0 || off >= i_size_read(inode)) { 1451 unlock_page(page); 1452 put_page(page); 1453 if (ret1 < 0) 1454 ret = ret1; 1455 else 1456 ret = VM_FAULT_SIGBUS; 1457 goto out_inline; 1458 } 1459 if (ret1 < PAGE_SIZE) 1460 zero_user_segment(page, ret1, PAGE_SIZE); 1461 else 1462 flush_dcache_page(page); 1463 SetPageUptodate(page); 1464 vmf->page = page; 1465 ret = VM_FAULT_MAJOR | VM_FAULT_LOCKED; 1466 out_inline: 1467 dout("filemap_fault %p %llu~%zd read inline data ret %d\n", 1468 inode, off, (size_t)PAGE_SIZE, ret); 1469 } 1470 out_restore: 1471 ceph_restore_sigs(&oldset); 1472 if (ret < 0) 1473 ret = (ret == -ENOMEM) ? VM_FAULT_OOM : VM_FAULT_SIGBUS; 1474 1475 return ret; 1476 } 1477 1478 /* 1479 * Reuse write_begin here for simplicity. 1480 */ 1481 static int ceph_page_mkwrite(struct vm_fault *vmf) 1482 { 1483 struct vm_area_struct *vma = vmf->vma; 1484 struct inode *inode = file_inode(vma->vm_file); 1485 struct ceph_inode_info *ci = ceph_inode(inode); 1486 struct ceph_file_info *fi = vma->vm_file->private_data; 1487 struct ceph_cap_flush *prealloc_cf; 1488 struct page *page = vmf->page; 1489 loff_t off = page_offset(page); 1490 loff_t size = i_size_read(inode); 1491 size_t len; 1492 int want, got, ret; 1493 sigset_t oldset; 1494 1495 prealloc_cf = ceph_alloc_cap_flush(); 1496 if (!prealloc_cf) 1497 return VM_FAULT_OOM; 1498 1499 ceph_block_sigs(&oldset); 1500 1501 if (ci->i_inline_version != CEPH_INLINE_NONE) { 1502 struct page *locked_page = NULL; 1503 if (off == 0) { 1504 lock_page(page); 1505 locked_page = page; 1506 } 1507 ret = ceph_uninline_data(vma->vm_file, locked_page); 1508 if (locked_page) 1509 unlock_page(locked_page); 1510 if (ret < 0) 1511 goto out_free; 1512 } 1513 1514 if (off + PAGE_SIZE <= size) 1515 len = PAGE_SIZE; 1516 else 1517 len = size & ~PAGE_MASK; 1518 1519 dout("page_mkwrite %p %llx.%llx %llu~%zd getting caps i_size %llu\n", 1520 inode, ceph_vinop(inode), off, len, size); 1521 if (fi->fmode & CEPH_FILE_MODE_LAZY) 1522 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO; 1523 else 1524 want = CEPH_CAP_FILE_BUFFER; 1525 1526 got = 0; 1527 ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, off + len, 1528 &got, NULL); 1529 if (ret < 0) 1530 goto out_free; 1531 1532 dout("page_mkwrite %p %llu~%zd got cap refs on %s\n", 1533 inode, off, len, ceph_cap_string(got)); 1534 1535 /* Update time before taking page lock */ 1536 file_update_time(vma->vm_file); 1537 1538 do { 1539 lock_page(page); 1540 1541 if ((off > size) || (page->mapping != inode->i_mapping)) { 1542 unlock_page(page); 1543 ret = VM_FAULT_NOPAGE; 1544 break; 1545 } 1546 1547 ret = ceph_update_writeable_page(vma->vm_file, off, len, page); 1548 if (ret >= 0) { 1549 /* success. we'll keep the page locked. */ 1550 set_page_dirty(page); 1551 ret = VM_FAULT_LOCKED; 1552 } 1553 } while (ret == -EAGAIN); 1554 1555 if (ret == VM_FAULT_LOCKED || 1556 ci->i_inline_version != CEPH_INLINE_NONE) { 1557 int dirty; 1558 spin_lock(&ci->i_ceph_lock); 1559 ci->i_inline_version = CEPH_INLINE_NONE; 1560 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR, 1561 &prealloc_cf); 1562 spin_unlock(&ci->i_ceph_lock); 1563 if (dirty) 1564 __mark_inode_dirty(inode, dirty); 1565 } 1566 1567 dout("page_mkwrite %p %llu~%zd dropping cap refs on %s ret %d\n", 1568 inode, off, len, ceph_cap_string(got), ret); 1569 ceph_put_cap_refs(ci, got); 1570 out_free: 1571 ceph_restore_sigs(&oldset); 1572 ceph_free_cap_flush(prealloc_cf); 1573 if (ret < 0) 1574 ret = (ret == -ENOMEM) ? VM_FAULT_OOM : VM_FAULT_SIGBUS; 1575 return ret; 1576 } 1577 1578 void ceph_fill_inline_data(struct inode *inode, struct page *locked_page, 1579 char *data, size_t len) 1580 { 1581 struct address_space *mapping = inode->i_mapping; 1582 struct page *page; 1583 1584 if (locked_page) { 1585 page = locked_page; 1586 } else { 1587 if (i_size_read(inode) == 0) 1588 return; 1589 page = find_or_create_page(mapping, 0, 1590 mapping_gfp_constraint(mapping, 1591 ~__GFP_FS)); 1592 if (!page) 1593 return; 1594 if (PageUptodate(page)) { 1595 unlock_page(page); 1596 put_page(page); 1597 return; 1598 } 1599 } 1600 1601 dout("fill_inline_data %p %llx.%llx len %zu locked_page %p\n", 1602 inode, ceph_vinop(inode), len, locked_page); 1603 1604 if (len > 0) { 1605 void *kaddr = kmap_atomic(page); 1606 memcpy(kaddr, data, len); 1607 kunmap_atomic(kaddr); 1608 } 1609 1610 if (page != locked_page) { 1611 if (len < PAGE_SIZE) 1612 zero_user_segment(page, len, PAGE_SIZE); 1613 else 1614 flush_dcache_page(page); 1615 1616 SetPageUptodate(page); 1617 unlock_page(page); 1618 put_page(page); 1619 } 1620 } 1621 1622 int ceph_uninline_data(struct file *filp, struct page *locked_page) 1623 { 1624 struct inode *inode = file_inode(filp); 1625 struct ceph_inode_info *ci = ceph_inode(inode); 1626 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 1627 struct ceph_osd_request *req; 1628 struct page *page = NULL; 1629 u64 len, inline_version; 1630 int err = 0; 1631 bool from_pagecache = false; 1632 1633 spin_lock(&ci->i_ceph_lock); 1634 inline_version = ci->i_inline_version; 1635 spin_unlock(&ci->i_ceph_lock); 1636 1637 dout("uninline_data %p %llx.%llx inline_version %llu\n", 1638 inode, ceph_vinop(inode), inline_version); 1639 1640 if (inline_version == 1 || /* initial version, no data */ 1641 inline_version == CEPH_INLINE_NONE) 1642 goto out; 1643 1644 if (locked_page) { 1645 page = locked_page; 1646 WARN_ON(!PageUptodate(page)); 1647 } else if (ceph_caps_issued(ci) & 1648 (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) { 1649 page = find_get_page(inode->i_mapping, 0); 1650 if (page) { 1651 if (PageUptodate(page)) { 1652 from_pagecache = true; 1653 lock_page(page); 1654 } else { 1655 put_page(page); 1656 page = NULL; 1657 } 1658 } 1659 } 1660 1661 if (page) { 1662 len = i_size_read(inode); 1663 if (len > PAGE_SIZE) 1664 len = PAGE_SIZE; 1665 } else { 1666 page = __page_cache_alloc(GFP_NOFS); 1667 if (!page) { 1668 err = -ENOMEM; 1669 goto out; 1670 } 1671 err = __ceph_do_getattr(inode, page, 1672 CEPH_STAT_CAP_INLINE_DATA, true); 1673 if (err < 0) { 1674 /* no inline data */ 1675 if (err == -ENODATA) 1676 err = 0; 1677 goto out; 1678 } 1679 len = err; 1680 } 1681 1682 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, 1683 ceph_vino(inode), 0, &len, 0, 1, 1684 CEPH_OSD_OP_CREATE, CEPH_OSD_FLAG_WRITE, 1685 NULL, 0, 0, false); 1686 if (IS_ERR(req)) { 1687 err = PTR_ERR(req); 1688 goto out; 1689 } 1690 1691 req->r_mtime = inode->i_mtime; 1692 err = ceph_osdc_start_request(&fsc->client->osdc, req, false); 1693 if (!err) 1694 err = ceph_osdc_wait_request(&fsc->client->osdc, req); 1695 ceph_osdc_put_request(req); 1696 if (err < 0) 1697 goto out; 1698 1699 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, 1700 ceph_vino(inode), 0, &len, 1, 3, 1701 CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE, 1702 NULL, ci->i_truncate_seq, 1703 ci->i_truncate_size, false); 1704 if (IS_ERR(req)) { 1705 err = PTR_ERR(req); 1706 goto out; 1707 } 1708 1709 osd_req_op_extent_osd_data_pages(req, 1, &page, len, 0, false, false); 1710 1711 { 1712 __le64 xattr_buf = cpu_to_le64(inline_version); 1713 err = osd_req_op_xattr_init(req, 0, CEPH_OSD_OP_CMPXATTR, 1714 "inline_version", &xattr_buf, 1715 sizeof(xattr_buf), 1716 CEPH_OSD_CMPXATTR_OP_GT, 1717 CEPH_OSD_CMPXATTR_MODE_U64); 1718 if (err) 1719 goto out_put; 1720 } 1721 1722 { 1723 char xattr_buf[32]; 1724 int xattr_len = snprintf(xattr_buf, sizeof(xattr_buf), 1725 "%llu", inline_version); 1726 err = osd_req_op_xattr_init(req, 2, CEPH_OSD_OP_SETXATTR, 1727 "inline_version", 1728 xattr_buf, xattr_len, 0, 0); 1729 if (err) 1730 goto out_put; 1731 } 1732 1733 req->r_mtime = inode->i_mtime; 1734 err = ceph_osdc_start_request(&fsc->client->osdc, req, false); 1735 if (!err) 1736 err = ceph_osdc_wait_request(&fsc->client->osdc, req); 1737 out_put: 1738 ceph_osdc_put_request(req); 1739 if (err == -ECANCELED) 1740 err = 0; 1741 out: 1742 if (page && page != locked_page) { 1743 if (from_pagecache) { 1744 unlock_page(page); 1745 put_page(page); 1746 } else 1747 __free_pages(page, 0); 1748 } 1749 1750 dout("uninline_data %p %llx.%llx inline_version %llu = %d\n", 1751 inode, ceph_vinop(inode), inline_version, err); 1752 return err; 1753 } 1754 1755 static const struct vm_operations_struct ceph_vmops = { 1756 .fault = ceph_filemap_fault, 1757 .page_mkwrite = ceph_page_mkwrite, 1758 }; 1759 1760 int ceph_mmap(struct file *file, struct vm_area_struct *vma) 1761 { 1762 struct address_space *mapping = file->f_mapping; 1763 1764 if (!mapping->a_ops->readpage) 1765 return -ENOEXEC; 1766 file_accessed(file); 1767 vma->vm_ops = &ceph_vmops; 1768 return 0; 1769 } 1770 1771 enum { 1772 POOL_READ = 1, 1773 POOL_WRITE = 2, 1774 }; 1775 1776 static int __ceph_pool_perm_get(struct ceph_inode_info *ci, 1777 s64 pool, struct ceph_string *pool_ns) 1778 { 1779 struct ceph_fs_client *fsc = ceph_inode_to_client(&ci->vfs_inode); 1780 struct ceph_mds_client *mdsc = fsc->mdsc; 1781 struct ceph_osd_request *rd_req = NULL, *wr_req = NULL; 1782 struct rb_node **p, *parent; 1783 struct ceph_pool_perm *perm; 1784 struct page **pages; 1785 size_t pool_ns_len; 1786 int err = 0, err2 = 0, have = 0; 1787 1788 down_read(&mdsc->pool_perm_rwsem); 1789 p = &mdsc->pool_perm_tree.rb_node; 1790 while (*p) { 1791 perm = rb_entry(*p, struct ceph_pool_perm, node); 1792 if (pool < perm->pool) 1793 p = &(*p)->rb_left; 1794 else if (pool > perm->pool) 1795 p = &(*p)->rb_right; 1796 else { 1797 int ret = ceph_compare_string(pool_ns, 1798 perm->pool_ns, 1799 perm->pool_ns_len); 1800 if (ret < 0) 1801 p = &(*p)->rb_left; 1802 else if (ret > 0) 1803 p = &(*p)->rb_right; 1804 else { 1805 have = perm->perm; 1806 break; 1807 } 1808 } 1809 } 1810 up_read(&mdsc->pool_perm_rwsem); 1811 if (*p) 1812 goto out; 1813 1814 if (pool_ns) 1815 dout("__ceph_pool_perm_get pool %lld ns %.*s no perm cached\n", 1816 pool, (int)pool_ns->len, pool_ns->str); 1817 else 1818 dout("__ceph_pool_perm_get pool %lld no perm cached\n", pool); 1819 1820 down_write(&mdsc->pool_perm_rwsem); 1821 p = &mdsc->pool_perm_tree.rb_node; 1822 parent = NULL; 1823 while (*p) { 1824 parent = *p; 1825 perm = rb_entry(parent, struct ceph_pool_perm, node); 1826 if (pool < perm->pool) 1827 p = &(*p)->rb_left; 1828 else if (pool > perm->pool) 1829 p = &(*p)->rb_right; 1830 else { 1831 int ret = ceph_compare_string(pool_ns, 1832 perm->pool_ns, 1833 perm->pool_ns_len); 1834 if (ret < 0) 1835 p = &(*p)->rb_left; 1836 else if (ret > 0) 1837 p = &(*p)->rb_right; 1838 else { 1839 have = perm->perm; 1840 break; 1841 } 1842 } 1843 } 1844 if (*p) { 1845 up_write(&mdsc->pool_perm_rwsem); 1846 goto out; 1847 } 1848 1849 rd_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL, 1850 1, false, GFP_NOFS); 1851 if (!rd_req) { 1852 err = -ENOMEM; 1853 goto out_unlock; 1854 } 1855 1856 rd_req->r_flags = CEPH_OSD_FLAG_READ; 1857 osd_req_op_init(rd_req, 0, CEPH_OSD_OP_STAT, 0); 1858 rd_req->r_base_oloc.pool = pool; 1859 if (pool_ns) 1860 rd_req->r_base_oloc.pool_ns = ceph_get_string(pool_ns); 1861 ceph_oid_printf(&rd_req->r_base_oid, "%llx.00000000", ci->i_vino.ino); 1862 1863 err = ceph_osdc_alloc_messages(rd_req, GFP_NOFS); 1864 if (err) 1865 goto out_unlock; 1866 1867 wr_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL, 1868 1, false, GFP_NOFS); 1869 if (!wr_req) { 1870 err = -ENOMEM; 1871 goto out_unlock; 1872 } 1873 1874 wr_req->r_flags = CEPH_OSD_FLAG_WRITE; 1875 osd_req_op_init(wr_req, 0, CEPH_OSD_OP_CREATE, CEPH_OSD_OP_FLAG_EXCL); 1876 ceph_oloc_copy(&wr_req->r_base_oloc, &rd_req->r_base_oloc); 1877 ceph_oid_copy(&wr_req->r_base_oid, &rd_req->r_base_oid); 1878 1879 err = ceph_osdc_alloc_messages(wr_req, GFP_NOFS); 1880 if (err) 1881 goto out_unlock; 1882 1883 /* one page should be large enough for STAT data */ 1884 pages = ceph_alloc_page_vector(1, GFP_KERNEL); 1885 if (IS_ERR(pages)) { 1886 err = PTR_ERR(pages); 1887 goto out_unlock; 1888 } 1889 1890 osd_req_op_raw_data_in_pages(rd_req, 0, pages, PAGE_SIZE, 1891 0, false, true); 1892 err = ceph_osdc_start_request(&fsc->client->osdc, rd_req, false); 1893 1894 wr_req->r_mtime = ci->vfs_inode.i_mtime; 1895 wr_req->r_abort_on_full = true; 1896 err2 = ceph_osdc_start_request(&fsc->client->osdc, wr_req, false); 1897 1898 if (!err) 1899 err = ceph_osdc_wait_request(&fsc->client->osdc, rd_req); 1900 if (!err2) 1901 err2 = ceph_osdc_wait_request(&fsc->client->osdc, wr_req); 1902 1903 if (err >= 0 || err == -ENOENT) 1904 have |= POOL_READ; 1905 else if (err != -EPERM) 1906 goto out_unlock; 1907 1908 if (err2 == 0 || err2 == -EEXIST) 1909 have |= POOL_WRITE; 1910 else if (err2 != -EPERM) { 1911 err = err2; 1912 goto out_unlock; 1913 } 1914 1915 pool_ns_len = pool_ns ? pool_ns->len : 0; 1916 perm = kmalloc(sizeof(*perm) + pool_ns_len + 1, GFP_NOFS); 1917 if (!perm) { 1918 err = -ENOMEM; 1919 goto out_unlock; 1920 } 1921 1922 perm->pool = pool; 1923 perm->perm = have; 1924 perm->pool_ns_len = pool_ns_len; 1925 if (pool_ns_len > 0) 1926 memcpy(perm->pool_ns, pool_ns->str, pool_ns_len); 1927 perm->pool_ns[pool_ns_len] = 0; 1928 1929 rb_link_node(&perm->node, parent, p); 1930 rb_insert_color(&perm->node, &mdsc->pool_perm_tree); 1931 err = 0; 1932 out_unlock: 1933 up_write(&mdsc->pool_perm_rwsem); 1934 1935 ceph_osdc_put_request(rd_req); 1936 ceph_osdc_put_request(wr_req); 1937 out: 1938 if (!err) 1939 err = have; 1940 if (pool_ns) 1941 dout("__ceph_pool_perm_get pool %lld ns %.*s result = %d\n", 1942 pool, (int)pool_ns->len, pool_ns->str, err); 1943 else 1944 dout("__ceph_pool_perm_get pool %lld result = %d\n", pool, err); 1945 return err; 1946 } 1947 1948 int ceph_pool_perm_check(struct ceph_inode_info *ci, int need) 1949 { 1950 s64 pool; 1951 struct ceph_string *pool_ns; 1952 int ret, flags; 1953 1954 if (ci->i_vino.snap != CEPH_NOSNAP) { 1955 /* 1956 * Pool permission check needs to write to the first object. 1957 * But for snapshot, head of the first object may have alread 1958 * been deleted. Skip check to avoid creating orphan object. 1959 */ 1960 return 0; 1961 } 1962 1963 if (ceph_test_mount_opt(ceph_inode_to_client(&ci->vfs_inode), 1964 NOPOOLPERM)) 1965 return 0; 1966 1967 spin_lock(&ci->i_ceph_lock); 1968 flags = ci->i_ceph_flags; 1969 pool = ci->i_layout.pool_id; 1970 spin_unlock(&ci->i_ceph_lock); 1971 check: 1972 if (flags & CEPH_I_POOL_PERM) { 1973 if ((need & CEPH_CAP_FILE_RD) && !(flags & CEPH_I_POOL_RD)) { 1974 dout("ceph_pool_perm_check pool %lld no read perm\n", 1975 pool); 1976 return -EPERM; 1977 } 1978 if ((need & CEPH_CAP_FILE_WR) && !(flags & CEPH_I_POOL_WR)) { 1979 dout("ceph_pool_perm_check pool %lld no write perm\n", 1980 pool); 1981 return -EPERM; 1982 } 1983 return 0; 1984 } 1985 1986 pool_ns = ceph_try_get_string(ci->i_layout.pool_ns); 1987 ret = __ceph_pool_perm_get(ci, pool, pool_ns); 1988 ceph_put_string(pool_ns); 1989 if (ret < 0) 1990 return ret; 1991 1992 flags = CEPH_I_POOL_PERM; 1993 if (ret & POOL_READ) 1994 flags |= CEPH_I_POOL_RD; 1995 if (ret & POOL_WRITE) 1996 flags |= CEPH_I_POOL_WR; 1997 1998 spin_lock(&ci->i_ceph_lock); 1999 if (pool == ci->i_layout.pool_id && 2000 pool_ns == rcu_dereference_raw(ci->i_layout.pool_ns)) { 2001 ci->i_ceph_flags |= flags; 2002 } else { 2003 pool = ci->i_layout.pool_id; 2004 flags = ci->i_ceph_flags; 2005 } 2006 spin_unlock(&ci->i_ceph_lock); 2007 goto check; 2008 } 2009 2010 void ceph_pool_perm_destroy(struct ceph_mds_client *mdsc) 2011 { 2012 struct ceph_pool_perm *perm; 2013 struct rb_node *n; 2014 2015 while (!RB_EMPTY_ROOT(&mdsc->pool_perm_tree)) { 2016 n = rb_first(&mdsc->pool_perm_tree); 2017 perm = rb_entry(n, struct ceph_pool_perm, node); 2018 rb_erase(n, &mdsc->pool_perm_tree); 2019 kfree(perm); 2020 } 2021 } 2022