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) { 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 seq %lld\n", 573 inode, page, page->index, page_off, len, snapc, snapc->seq); 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 loff_t snap_size, i_size; 756 u64 truncate_size; 757 u32 truncate_seq; 758 759 dout("writepages_start %p (mode=%s)\n", inode, 760 wbc->sync_mode == WB_SYNC_NONE ? "NONE" : 761 (wbc->sync_mode == WB_SYNC_ALL ? "ALL" : "HOLD")); 762 763 if (READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) { 764 if (ci->i_wrbuffer_ref > 0) { 765 pr_warn_ratelimited( 766 "writepage_start %p %lld forced umount\n", 767 inode, ceph_ino(inode)); 768 } 769 mapping_set_error(mapping, -EIO); 770 return -EIO; /* we're in a forced umount, don't write! */ 771 } 772 if (fsc->mount_options->wsize < wsize) 773 wsize = fsc->mount_options->wsize; 774 max_pages_ever = wsize >> PAGE_SHIFT; 775 776 pagevec_init(&pvec, 0); 777 778 /* where to start/end? */ 779 if (wbc->range_cyclic) { 780 start = mapping->writeback_index; /* Start from prev offset */ 781 end = -1; 782 dout(" cyclic, start at %lu\n", start); 783 } else { 784 start = wbc->range_start >> PAGE_SHIFT; 785 end = wbc->range_end >> PAGE_SHIFT; 786 if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) 787 range_whole = 1; 788 should_loop = 0; 789 dout(" not cyclic, %lu to %lu\n", start, end); 790 } 791 index = start; 792 793 retry: 794 /* find oldest snap context with dirty data */ 795 ceph_put_snap_context(snapc); 796 snap_size = -1; 797 snapc = get_oldest_context(inode, &snap_size, 798 &truncate_size, &truncate_seq); 799 if (!snapc) { 800 /* hmm, why does writepages get called when there 801 is no dirty data? */ 802 dout(" no snap context with dirty data?\n"); 803 goto out; 804 } 805 dout(" oldest snapc is %p seq %lld (%d snaps)\n", 806 snapc, snapc->seq, snapc->num_snaps); 807 808 i_size = i_size_read(inode); 809 810 if (last_snapc && snapc != last_snapc) { 811 /* if we switched to a newer snapc, restart our scan at the 812 * start of the original file range. */ 813 dout(" snapc differs from last pass, restarting at %lu\n", 814 index); 815 index = start; 816 } 817 last_snapc = snapc; 818 819 while (!done && index <= end) { 820 unsigned i; 821 int first; 822 pgoff_t strip_unit_end = 0; 823 int num_ops = 0, op_idx; 824 int pvec_pages, locked_pages = 0; 825 struct page **pages = NULL, **data_pages; 826 mempool_t *pool = NULL; /* Becomes non-null if mempool used */ 827 struct page *page; 828 int want; 829 u64 offset = 0, len = 0; 830 831 max_pages = max_pages_ever; 832 833 get_more_pages: 834 first = -1; 835 want = min(end - index, 836 min((pgoff_t)PAGEVEC_SIZE, 837 max_pages - (pgoff_t)locked_pages) - 1) 838 + 1; 839 pvec_pages = pagevec_lookup_tag(&pvec, mapping, &index, 840 PAGECACHE_TAG_DIRTY, 841 want); 842 dout("pagevec_lookup_tag got %d\n", pvec_pages); 843 if (!pvec_pages && !locked_pages) 844 break; 845 for (i = 0; i < pvec_pages && locked_pages < max_pages; i++) { 846 page = pvec.pages[i]; 847 dout("? %p idx %lu\n", page, page->index); 848 if (locked_pages == 0) 849 lock_page(page); /* first page */ 850 else if (!trylock_page(page)) 851 break; 852 853 /* only dirty pages, or our accounting breaks */ 854 if (unlikely(!PageDirty(page)) || 855 unlikely(page->mapping != mapping)) { 856 dout("!dirty or !mapping %p\n", page); 857 unlock_page(page); 858 break; 859 } 860 if (!wbc->range_cyclic && page->index > end) { 861 dout("end of range %p\n", page); 862 done = 1; 863 unlock_page(page); 864 break; 865 } 866 if (strip_unit_end && (page->index > strip_unit_end)) { 867 dout("end of strip unit %p\n", page); 868 unlock_page(page); 869 break; 870 } 871 if (wbc->sync_mode != WB_SYNC_NONE) { 872 dout("waiting on writeback %p\n", page); 873 wait_on_page_writeback(page); 874 } 875 if (page_offset(page) >= 876 (snap_size == -1 ? i_size : snap_size)) { 877 dout("%p page eof %llu\n", page, 878 (snap_size == -1 ? i_size : snap_size)); 879 done = 1; 880 unlock_page(page); 881 break; 882 } 883 if (PageWriteback(page)) { 884 dout("%p under writeback\n", page); 885 unlock_page(page); 886 break; 887 } 888 889 /* only if matching snap context */ 890 pgsnapc = page_snap_context(page); 891 if (pgsnapc->seq > snapc->seq) { 892 dout("page snapc %p %lld > oldest %p %lld\n", 893 pgsnapc, pgsnapc->seq, snapc, snapc->seq); 894 unlock_page(page); 895 if (!locked_pages) 896 continue; /* keep looking for snap */ 897 break; 898 } 899 900 if (!clear_page_dirty_for_io(page)) { 901 dout("%p !clear_page_dirty_for_io\n", page); 902 unlock_page(page); 903 break; 904 } 905 906 /* 907 * We have something to write. If this is 908 * the first locked page this time through, 909 * calculate max possinle write size and 910 * allocate a page array 911 */ 912 if (locked_pages == 0) { 913 u64 objnum; 914 u64 objoff; 915 916 /* prepare async write request */ 917 offset = (u64)page_offset(page); 918 len = wsize; 919 920 rc = ceph_calc_file_object_mapping(&ci->i_layout, 921 offset, len, 922 &objnum, &objoff, 923 &len); 924 if (rc < 0) { 925 unlock_page(page); 926 break; 927 } 928 929 num_ops = 1; 930 strip_unit_end = page->index + 931 ((len - 1) >> PAGE_SHIFT); 932 933 BUG_ON(pages); 934 max_pages = calc_pages_for(0, (u64)len); 935 pages = kmalloc(max_pages * sizeof (*pages), 936 GFP_NOFS); 937 if (!pages) { 938 pool = fsc->wb_pagevec_pool; 939 pages = mempool_alloc(pool, GFP_NOFS); 940 BUG_ON(!pages); 941 } 942 943 len = 0; 944 } else if (page->index != 945 (offset + len) >> PAGE_SHIFT) { 946 if (num_ops >= (pool ? CEPH_OSD_SLAB_OPS : 947 CEPH_OSD_MAX_OPS)) { 948 redirty_page_for_writepage(wbc, page); 949 unlock_page(page); 950 break; 951 } 952 953 num_ops++; 954 offset = (u64)page_offset(page); 955 len = 0; 956 } 957 958 /* note position of first page in pvec */ 959 if (first < 0) 960 first = i; 961 dout("%p will write page %p idx %lu\n", 962 inode, page, page->index); 963 964 if (atomic_long_inc_return(&fsc->writeback_count) > 965 CONGESTION_ON_THRESH( 966 fsc->mount_options->congestion_kb)) { 967 set_bdi_congested(inode_to_bdi(inode), 968 BLK_RW_ASYNC); 969 } 970 971 pages[locked_pages] = page; 972 locked_pages++; 973 len += PAGE_SIZE; 974 } 975 976 /* did we get anything? */ 977 if (!locked_pages) 978 goto release_pvec_pages; 979 if (i) { 980 int j; 981 BUG_ON(!locked_pages || first < 0); 982 983 if (pvec_pages && i == pvec_pages && 984 locked_pages < max_pages) { 985 dout("reached end pvec, trying for more\n"); 986 pagevec_reinit(&pvec); 987 goto get_more_pages; 988 } 989 990 /* shift unused pages over in the pvec... we 991 * will need to release them below. */ 992 for (j = i; j < pvec_pages; j++) { 993 dout(" pvec leftover page %p\n", pvec.pages[j]); 994 pvec.pages[j-i+first] = pvec.pages[j]; 995 } 996 pvec.nr -= i-first; 997 } 998 999 new_request: 1000 offset = page_offset(pages[0]); 1001 len = wsize; 1002 1003 req = ceph_osdc_new_request(&fsc->client->osdc, 1004 &ci->i_layout, vino, 1005 offset, &len, 0, num_ops, 1006 CEPH_OSD_OP_WRITE, 1007 CEPH_OSD_FLAG_WRITE, 1008 snapc, truncate_seq, 1009 truncate_size, false); 1010 if (IS_ERR(req)) { 1011 req = ceph_osdc_new_request(&fsc->client->osdc, 1012 &ci->i_layout, vino, 1013 offset, &len, 0, 1014 min(num_ops, 1015 CEPH_OSD_SLAB_OPS), 1016 CEPH_OSD_OP_WRITE, 1017 CEPH_OSD_FLAG_WRITE, 1018 snapc, truncate_seq, 1019 truncate_size, true); 1020 BUG_ON(IS_ERR(req)); 1021 } 1022 BUG_ON(len < page_offset(pages[locked_pages - 1]) + 1023 PAGE_SIZE - offset); 1024 1025 req->r_callback = writepages_finish; 1026 req->r_inode = inode; 1027 1028 /* Format the osd request message and submit the write */ 1029 len = 0; 1030 data_pages = pages; 1031 op_idx = 0; 1032 for (i = 0; i < locked_pages; i++) { 1033 u64 cur_offset = page_offset(pages[i]); 1034 if (offset + len != cur_offset) { 1035 if (op_idx + 1 == req->r_num_ops) 1036 break; 1037 osd_req_op_extent_dup_last(req, op_idx, 1038 cur_offset - offset); 1039 dout("writepages got pages at %llu~%llu\n", 1040 offset, len); 1041 osd_req_op_extent_osd_data_pages(req, op_idx, 1042 data_pages, len, 0, 1043 !!pool, false); 1044 osd_req_op_extent_update(req, op_idx, len); 1045 1046 len = 0; 1047 offset = cur_offset; 1048 data_pages = pages + i; 1049 op_idx++; 1050 } 1051 1052 set_page_writeback(pages[i]); 1053 len += PAGE_SIZE; 1054 } 1055 1056 if (snap_size != -1) { 1057 len = min(len, snap_size - offset); 1058 } else if (i == locked_pages) { 1059 /* writepages_finish() clears writeback pages 1060 * according to the data length, so make sure 1061 * data length covers all locked pages */ 1062 u64 min_len = len + 1 - PAGE_SIZE; 1063 len = min(len, (u64)i_size_read(inode) - offset); 1064 len = max(len, min_len); 1065 } 1066 dout("writepages got pages at %llu~%llu\n", offset, len); 1067 1068 osd_req_op_extent_osd_data_pages(req, op_idx, data_pages, len, 1069 0, !!pool, false); 1070 osd_req_op_extent_update(req, op_idx, len); 1071 1072 BUG_ON(op_idx + 1 != req->r_num_ops); 1073 1074 pool = NULL; 1075 if (i < locked_pages) { 1076 BUG_ON(num_ops <= req->r_num_ops); 1077 num_ops -= req->r_num_ops; 1078 locked_pages -= i; 1079 1080 /* allocate new pages array for next request */ 1081 data_pages = pages; 1082 pages = kmalloc(locked_pages * sizeof (*pages), 1083 GFP_NOFS); 1084 if (!pages) { 1085 pool = fsc->wb_pagevec_pool; 1086 pages = mempool_alloc(pool, GFP_NOFS); 1087 BUG_ON(!pages); 1088 } 1089 memcpy(pages, data_pages + i, 1090 locked_pages * sizeof(*pages)); 1091 memset(data_pages + i, 0, 1092 locked_pages * sizeof(*pages)); 1093 } else { 1094 BUG_ON(num_ops != req->r_num_ops); 1095 index = pages[i - 1]->index + 1; 1096 /* request message now owns the pages array */ 1097 pages = NULL; 1098 } 1099 1100 req->r_mtime = inode->i_mtime; 1101 rc = ceph_osdc_start_request(&fsc->client->osdc, req, true); 1102 BUG_ON(rc); 1103 req = NULL; 1104 1105 wbc->nr_to_write -= i; 1106 if (pages) 1107 goto new_request; 1108 1109 if (wbc->nr_to_write <= 0) 1110 done = 1; 1111 1112 release_pvec_pages: 1113 dout("pagevec_release on %d pages (%p)\n", (int)pvec.nr, 1114 pvec.nr ? pvec.pages[0] : NULL); 1115 pagevec_release(&pvec); 1116 1117 if (locked_pages && !done) 1118 goto retry; 1119 } 1120 1121 if (should_loop && !done) { 1122 /* more to do; loop back to beginning of file */ 1123 dout("writepages looping back to beginning of file\n"); 1124 should_loop = 0; 1125 index = 0; 1126 goto retry; 1127 } 1128 1129 if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) 1130 mapping->writeback_index = index; 1131 1132 out: 1133 ceph_osdc_put_request(req); 1134 ceph_put_snap_context(snapc); 1135 dout("writepages done, rc = %d\n", rc); 1136 return rc; 1137 } 1138 1139 1140 1141 /* 1142 * See if a given @snapc is either writeable, or already written. 1143 */ 1144 static int context_is_writeable_or_written(struct inode *inode, 1145 struct ceph_snap_context *snapc) 1146 { 1147 struct ceph_snap_context *oldest = get_oldest_context(inode, NULL, 1148 NULL, NULL); 1149 int ret = !oldest || snapc->seq <= oldest->seq; 1150 1151 ceph_put_snap_context(oldest); 1152 return ret; 1153 } 1154 1155 /* 1156 * We are only allowed to write into/dirty the page if the page is 1157 * clean, or already dirty within the same snap context. 1158 * 1159 * called with page locked. 1160 * return success with page locked, 1161 * or any failure (incl -EAGAIN) with page unlocked. 1162 */ 1163 static int ceph_update_writeable_page(struct file *file, 1164 loff_t pos, unsigned len, 1165 struct page *page) 1166 { 1167 struct inode *inode = file_inode(file); 1168 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 1169 struct ceph_inode_info *ci = ceph_inode(inode); 1170 loff_t page_off = pos & PAGE_MASK; 1171 int pos_in_page = pos & ~PAGE_MASK; 1172 int end_in_page = pos_in_page + len; 1173 loff_t i_size; 1174 int r; 1175 struct ceph_snap_context *snapc, *oldest; 1176 1177 if (READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) { 1178 dout(" page %p forced umount\n", page); 1179 unlock_page(page); 1180 return -EIO; 1181 } 1182 1183 retry_locked: 1184 /* writepages currently holds page lock, but if we change that later, */ 1185 wait_on_page_writeback(page); 1186 1187 snapc = page_snap_context(page); 1188 if (snapc && snapc != ci->i_head_snapc) { 1189 /* 1190 * this page is already dirty in another (older) snap 1191 * context! is it writeable now? 1192 */ 1193 oldest = get_oldest_context(inode, NULL, NULL, NULL); 1194 1195 if (snapc->seq > oldest->seq) { 1196 ceph_put_snap_context(oldest); 1197 dout(" page %p snapc %p not current or oldest\n", 1198 page, snapc); 1199 /* 1200 * queue for writeback, and wait for snapc to 1201 * be writeable or written 1202 */ 1203 snapc = ceph_get_snap_context(snapc); 1204 unlock_page(page); 1205 ceph_queue_writeback(inode); 1206 r = wait_event_killable(ci->i_cap_wq, 1207 context_is_writeable_or_written(inode, snapc)); 1208 ceph_put_snap_context(snapc); 1209 if (r == -ERESTARTSYS) 1210 return r; 1211 return -EAGAIN; 1212 } 1213 ceph_put_snap_context(oldest); 1214 1215 /* yay, writeable, do it now (without dropping page lock) */ 1216 dout(" page %p snapc %p not current, but oldest\n", 1217 page, snapc); 1218 if (!clear_page_dirty_for_io(page)) 1219 goto retry_locked; 1220 r = writepage_nounlock(page, NULL); 1221 if (r < 0) 1222 goto fail_unlock; 1223 goto retry_locked; 1224 } 1225 1226 if (PageUptodate(page)) { 1227 dout(" page %p already uptodate\n", page); 1228 return 0; 1229 } 1230 1231 /* full page? */ 1232 if (pos_in_page == 0 && len == PAGE_SIZE) 1233 return 0; 1234 1235 /* past end of file? */ 1236 i_size = i_size_read(inode); 1237 1238 if (page_off >= i_size || 1239 (pos_in_page == 0 && (pos+len) >= i_size && 1240 end_in_page - pos_in_page != PAGE_SIZE)) { 1241 dout(" zeroing %p 0 - %d and %d - %d\n", 1242 page, pos_in_page, end_in_page, (int)PAGE_SIZE); 1243 zero_user_segments(page, 1244 0, pos_in_page, 1245 end_in_page, PAGE_SIZE); 1246 return 0; 1247 } 1248 1249 /* we need to read it. */ 1250 r = ceph_do_readpage(file, page); 1251 if (r < 0) { 1252 if (r == -EINPROGRESS) 1253 return -EAGAIN; 1254 goto fail_unlock; 1255 } 1256 goto retry_locked; 1257 fail_unlock: 1258 unlock_page(page); 1259 return r; 1260 } 1261 1262 /* 1263 * We are only allowed to write into/dirty the page if the page is 1264 * clean, or already dirty within the same snap context. 1265 */ 1266 static int ceph_write_begin(struct file *file, struct address_space *mapping, 1267 loff_t pos, unsigned len, unsigned flags, 1268 struct page **pagep, void **fsdata) 1269 { 1270 struct inode *inode = file_inode(file); 1271 struct page *page; 1272 pgoff_t index = pos >> PAGE_SHIFT; 1273 int r; 1274 1275 do { 1276 /* get a page */ 1277 page = grab_cache_page_write_begin(mapping, index, 0); 1278 if (!page) 1279 return -ENOMEM; 1280 1281 dout("write_begin file %p inode %p page %p %d~%d\n", file, 1282 inode, page, (int)pos, (int)len); 1283 1284 r = ceph_update_writeable_page(file, pos, len, page); 1285 if (r < 0) 1286 put_page(page); 1287 else 1288 *pagep = page; 1289 } while (r == -EAGAIN); 1290 1291 return r; 1292 } 1293 1294 /* 1295 * we don't do anything in here that simple_write_end doesn't do 1296 * except adjust dirty page accounting 1297 */ 1298 static int ceph_write_end(struct file *file, struct address_space *mapping, 1299 loff_t pos, unsigned len, unsigned copied, 1300 struct page *page, void *fsdata) 1301 { 1302 struct inode *inode = file_inode(file); 1303 bool check_cap = false; 1304 1305 dout("write_end file %p inode %p page %p %d~%d (%d)\n", file, 1306 inode, page, (int)pos, (int)copied, (int)len); 1307 1308 /* zero the stale part of the page if we did a short copy */ 1309 if (!PageUptodate(page)) { 1310 if (copied < len) { 1311 copied = 0; 1312 goto out; 1313 } 1314 SetPageUptodate(page); 1315 } 1316 1317 /* did file size increase? */ 1318 if (pos+copied > i_size_read(inode)) 1319 check_cap = ceph_inode_set_size(inode, pos+copied); 1320 1321 set_page_dirty(page); 1322 1323 out: 1324 unlock_page(page); 1325 put_page(page); 1326 1327 if (check_cap) 1328 ceph_check_caps(ceph_inode(inode), CHECK_CAPS_AUTHONLY, NULL); 1329 1330 return copied; 1331 } 1332 1333 /* 1334 * we set .direct_IO to indicate direct io is supported, but since we 1335 * intercept O_DIRECT reads and writes early, this function should 1336 * never get called. 1337 */ 1338 static ssize_t ceph_direct_io(struct kiocb *iocb, struct iov_iter *iter) 1339 { 1340 WARN_ON(1); 1341 return -EINVAL; 1342 } 1343 1344 const struct address_space_operations ceph_aops = { 1345 .readpage = ceph_readpage, 1346 .readpages = ceph_readpages, 1347 .writepage = ceph_writepage, 1348 .writepages = ceph_writepages_start, 1349 .write_begin = ceph_write_begin, 1350 .write_end = ceph_write_end, 1351 .set_page_dirty = ceph_set_page_dirty, 1352 .invalidatepage = ceph_invalidatepage, 1353 .releasepage = ceph_releasepage, 1354 .direct_IO = ceph_direct_io, 1355 }; 1356 1357 static void ceph_block_sigs(sigset_t *oldset) 1358 { 1359 sigset_t mask; 1360 siginitsetinv(&mask, sigmask(SIGKILL)); 1361 sigprocmask(SIG_BLOCK, &mask, oldset); 1362 } 1363 1364 static void ceph_restore_sigs(sigset_t *oldset) 1365 { 1366 sigprocmask(SIG_SETMASK, oldset, NULL); 1367 } 1368 1369 /* 1370 * vm ops 1371 */ 1372 static int ceph_filemap_fault(struct vm_fault *vmf) 1373 { 1374 struct vm_area_struct *vma = vmf->vma; 1375 struct inode *inode = file_inode(vma->vm_file); 1376 struct ceph_inode_info *ci = ceph_inode(inode); 1377 struct ceph_file_info *fi = vma->vm_file->private_data; 1378 struct page *pinned_page = NULL; 1379 loff_t off = vmf->pgoff << PAGE_SHIFT; 1380 int want, got, ret; 1381 sigset_t oldset; 1382 1383 ceph_block_sigs(&oldset); 1384 1385 dout("filemap_fault %p %llx.%llx %llu~%zd trying to get caps\n", 1386 inode, ceph_vinop(inode), off, (size_t)PAGE_SIZE); 1387 if (fi->fmode & CEPH_FILE_MODE_LAZY) 1388 want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO; 1389 else 1390 want = CEPH_CAP_FILE_CACHE; 1391 1392 got = 0; 1393 ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, -1, &got, &pinned_page); 1394 if (ret < 0) 1395 goto out_restore; 1396 1397 dout("filemap_fault %p %llu~%zd got cap refs on %s\n", 1398 inode, off, (size_t)PAGE_SIZE, ceph_cap_string(got)); 1399 1400 if ((got & (CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO)) || 1401 ci->i_inline_version == CEPH_INLINE_NONE) { 1402 current->journal_info = vma->vm_file; 1403 ret = filemap_fault(vmf); 1404 current->journal_info = NULL; 1405 } else 1406 ret = -EAGAIN; 1407 1408 dout("filemap_fault %p %llu~%zd dropping cap refs on %s ret %d\n", 1409 inode, off, (size_t)PAGE_SIZE, ceph_cap_string(got), ret); 1410 if (pinned_page) 1411 put_page(pinned_page); 1412 ceph_put_cap_refs(ci, got); 1413 1414 if (ret != -EAGAIN) 1415 goto out_restore; 1416 1417 /* read inline data */ 1418 if (off >= PAGE_SIZE) { 1419 /* does not support inline data > PAGE_SIZE */ 1420 ret = VM_FAULT_SIGBUS; 1421 } else { 1422 int ret1; 1423 struct address_space *mapping = inode->i_mapping; 1424 struct page *page = find_or_create_page(mapping, 0, 1425 mapping_gfp_constraint(mapping, 1426 ~__GFP_FS)); 1427 if (!page) { 1428 ret = VM_FAULT_OOM; 1429 goto out_inline; 1430 } 1431 ret1 = __ceph_do_getattr(inode, page, 1432 CEPH_STAT_CAP_INLINE_DATA, true); 1433 if (ret1 < 0 || off >= i_size_read(inode)) { 1434 unlock_page(page); 1435 put_page(page); 1436 if (ret1 < 0) 1437 ret = ret1; 1438 else 1439 ret = VM_FAULT_SIGBUS; 1440 goto out_inline; 1441 } 1442 if (ret1 < PAGE_SIZE) 1443 zero_user_segment(page, ret1, PAGE_SIZE); 1444 else 1445 flush_dcache_page(page); 1446 SetPageUptodate(page); 1447 vmf->page = page; 1448 ret = VM_FAULT_MAJOR | VM_FAULT_LOCKED; 1449 out_inline: 1450 dout("filemap_fault %p %llu~%zd read inline data ret %d\n", 1451 inode, off, (size_t)PAGE_SIZE, ret); 1452 } 1453 out_restore: 1454 ceph_restore_sigs(&oldset); 1455 if (ret < 0) 1456 ret = (ret == -ENOMEM) ? VM_FAULT_OOM : VM_FAULT_SIGBUS; 1457 1458 return ret; 1459 } 1460 1461 /* 1462 * Reuse write_begin here for simplicity. 1463 */ 1464 static int ceph_page_mkwrite(struct vm_fault *vmf) 1465 { 1466 struct vm_area_struct *vma = vmf->vma; 1467 struct inode *inode = file_inode(vma->vm_file); 1468 struct ceph_inode_info *ci = ceph_inode(inode); 1469 struct ceph_file_info *fi = vma->vm_file->private_data; 1470 struct ceph_cap_flush *prealloc_cf; 1471 struct page *page = vmf->page; 1472 loff_t off = page_offset(page); 1473 loff_t size = i_size_read(inode); 1474 size_t len; 1475 int want, got, ret; 1476 sigset_t oldset; 1477 1478 prealloc_cf = ceph_alloc_cap_flush(); 1479 if (!prealloc_cf) 1480 return VM_FAULT_OOM; 1481 1482 ceph_block_sigs(&oldset); 1483 1484 if (ci->i_inline_version != CEPH_INLINE_NONE) { 1485 struct page *locked_page = NULL; 1486 if (off == 0) { 1487 lock_page(page); 1488 locked_page = page; 1489 } 1490 ret = ceph_uninline_data(vma->vm_file, locked_page); 1491 if (locked_page) 1492 unlock_page(locked_page); 1493 if (ret < 0) 1494 goto out_free; 1495 } 1496 1497 if (off + PAGE_SIZE <= size) 1498 len = PAGE_SIZE; 1499 else 1500 len = size & ~PAGE_MASK; 1501 1502 dout("page_mkwrite %p %llx.%llx %llu~%zd getting caps i_size %llu\n", 1503 inode, ceph_vinop(inode), off, len, size); 1504 if (fi->fmode & CEPH_FILE_MODE_LAZY) 1505 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO; 1506 else 1507 want = CEPH_CAP_FILE_BUFFER; 1508 1509 got = 0; 1510 ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, off + len, 1511 &got, NULL); 1512 if (ret < 0) 1513 goto out_free; 1514 1515 dout("page_mkwrite %p %llu~%zd got cap refs on %s\n", 1516 inode, off, len, ceph_cap_string(got)); 1517 1518 /* Update time before taking page lock */ 1519 file_update_time(vma->vm_file); 1520 1521 do { 1522 lock_page(page); 1523 1524 if ((off > size) || (page->mapping != inode->i_mapping)) { 1525 unlock_page(page); 1526 ret = VM_FAULT_NOPAGE; 1527 break; 1528 } 1529 1530 ret = ceph_update_writeable_page(vma->vm_file, off, len, page); 1531 if (ret >= 0) { 1532 /* success. we'll keep the page locked. */ 1533 set_page_dirty(page); 1534 ret = VM_FAULT_LOCKED; 1535 } 1536 } while (ret == -EAGAIN); 1537 1538 if (ret == VM_FAULT_LOCKED || 1539 ci->i_inline_version != CEPH_INLINE_NONE) { 1540 int dirty; 1541 spin_lock(&ci->i_ceph_lock); 1542 ci->i_inline_version = CEPH_INLINE_NONE; 1543 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR, 1544 &prealloc_cf); 1545 spin_unlock(&ci->i_ceph_lock); 1546 if (dirty) 1547 __mark_inode_dirty(inode, dirty); 1548 } 1549 1550 dout("page_mkwrite %p %llu~%zd dropping cap refs on %s ret %d\n", 1551 inode, off, len, ceph_cap_string(got), ret); 1552 ceph_put_cap_refs(ci, got); 1553 out_free: 1554 ceph_restore_sigs(&oldset); 1555 ceph_free_cap_flush(prealloc_cf); 1556 if (ret < 0) 1557 ret = (ret == -ENOMEM) ? VM_FAULT_OOM : VM_FAULT_SIGBUS; 1558 return ret; 1559 } 1560 1561 void ceph_fill_inline_data(struct inode *inode, struct page *locked_page, 1562 char *data, size_t len) 1563 { 1564 struct address_space *mapping = inode->i_mapping; 1565 struct page *page; 1566 1567 if (locked_page) { 1568 page = locked_page; 1569 } else { 1570 if (i_size_read(inode) == 0) 1571 return; 1572 page = find_or_create_page(mapping, 0, 1573 mapping_gfp_constraint(mapping, 1574 ~__GFP_FS)); 1575 if (!page) 1576 return; 1577 if (PageUptodate(page)) { 1578 unlock_page(page); 1579 put_page(page); 1580 return; 1581 } 1582 } 1583 1584 dout("fill_inline_data %p %llx.%llx len %zu locked_page %p\n", 1585 inode, ceph_vinop(inode), len, locked_page); 1586 1587 if (len > 0) { 1588 void *kaddr = kmap_atomic(page); 1589 memcpy(kaddr, data, len); 1590 kunmap_atomic(kaddr); 1591 } 1592 1593 if (page != locked_page) { 1594 if (len < PAGE_SIZE) 1595 zero_user_segment(page, len, PAGE_SIZE); 1596 else 1597 flush_dcache_page(page); 1598 1599 SetPageUptodate(page); 1600 unlock_page(page); 1601 put_page(page); 1602 } 1603 } 1604 1605 int ceph_uninline_data(struct file *filp, struct page *locked_page) 1606 { 1607 struct inode *inode = file_inode(filp); 1608 struct ceph_inode_info *ci = ceph_inode(inode); 1609 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 1610 struct ceph_osd_request *req; 1611 struct page *page = NULL; 1612 u64 len, inline_version; 1613 int err = 0; 1614 bool from_pagecache = false; 1615 1616 spin_lock(&ci->i_ceph_lock); 1617 inline_version = ci->i_inline_version; 1618 spin_unlock(&ci->i_ceph_lock); 1619 1620 dout("uninline_data %p %llx.%llx inline_version %llu\n", 1621 inode, ceph_vinop(inode), inline_version); 1622 1623 if (inline_version == 1 || /* initial version, no data */ 1624 inline_version == CEPH_INLINE_NONE) 1625 goto out; 1626 1627 if (locked_page) { 1628 page = locked_page; 1629 WARN_ON(!PageUptodate(page)); 1630 } else if (ceph_caps_issued(ci) & 1631 (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) { 1632 page = find_get_page(inode->i_mapping, 0); 1633 if (page) { 1634 if (PageUptodate(page)) { 1635 from_pagecache = true; 1636 lock_page(page); 1637 } else { 1638 put_page(page); 1639 page = NULL; 1640 } 1641 } 1642 } 1643 1644 if (page) { 1645 len = i_size_read(inode); 1646 if (len > PAGE_SIZE) 1647 len = PAGE_SIZE; 1648 } else { 1649 page = __page_cache_alloc(GFP_NOFS); 1650 if (!page) { 1651 err = -ENOMEM; 1652 goto out; 1653 } 1654 err = __ceph_do_getattr(inode, page, 1655 CEPH_STAT_CAP_INLINE_DATA, true); 1656 if (err < 0) { 1657 /* no inline data */ 1658 if (err == -ENODATA) 1659 err = 0; 1660 goto out; 1661 } 1662 len = err; 1663 } 1664 1665 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, 1666 ceph_vino(inode), 0, &len, 0, 1, 1667 CEPH_OSD_OP_CREATE, CEPH_OSD_FLAG_WRITE, 1668 NULL, 0, 0, false); 1669 if (IS_ERR(req)) { 1670 err = PTR_ERR(req); 1671 goto out; 1672 } 1673 1674 req->r_mtime = inode->i_mtime; 1675 err = ceph_osdc_start_request(&fsc->client->osdc, req, false); 1676 if (!err) 1677 err = ceph_osdc_wait_request(&fsc->client->osdc, req); 1678 ceph_osdc_put_request(req); 1679 if (err < 0) 1680 goto out; 1681 1682 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, 1683 ceph_vino(inode), 0, &len, 1, 3, 1684 CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE, 1685 NULL, ci->i_truncate_seq, 1686 ci->i_truncate_size, false); 1687 if (IS_ERR(req)) { 1688 err = PTR_ERR(req); 1689 goto out; 1690 } 1691 1692 osd_req_op_extent_osd_data_pages(req, 1, &page, len, 0, false, false); 1693 1694 { 1695 __le64 xattr_buf = cpu_to_le64(inline_version); 1696 err = osd_req_op_xattr_init(req, 0, CEPH_OSD_OP_CMPXATTR, 1697 "inline_version", &xattr_buf, 1698 sizeof(xattr_buf), 1699 CEPH_OSD_CMPXATTR_OP_GT, 1700 CEPH_OSD_CMPXATTR_MODE_U64); 1701 if (err) 1702 goto out_put; 1703 } 1704 1705 { 1706 char xattr_buf[32]; 1707 int xattr_len = snprintf(xattr_buf, sizeof(xattr_buf), 1708 "%llu", inline_version); 1709 err = osd_req_op_xattr_init(req, 2, CEPH_OSD_OP_SETXATTR, 1710 "inline_version", 1711 xattr_buf, xattr_len, 0, 0); 1712 if (err) 1713 goto out_put; 1714 } 1715 1716 req->r_mtime = inode->i_mtime; 1717 err = ceph_osdc_start_request(&fsc->client->osdc, req, false); 1718 if (!err) 1719 err = ceph_osdc_wait_request(&fsc->client->osdc, req); 1720 out_put: 1721 ceph_osdc_put_request(req); 1722 if (err == -ECANCELED) 1723 err = 0; 1724 out: 1725 if (page && page != locked_page) { 1726 if (from_pagecache) { 1727 unlock_page(page); 1728 put_page(page); 1729 } else 1730 __free_pages(page, 0); 1731 } 1732 1733 dout("uninline_data %p %llx.%llx inline_version %llu = %d\n", 1734 inode, ceph_vinop(inode), inline_version, err); 1735 return err; 1736 } 1737 1738 static const struct vm_operations_struct ceph_vmops = { 1739 .fault = ceph_filemap_fault, 1740 .page_mkwrite = ceph_page_mkwrite, 1741 }; 1742 1743 int ceph_mmap(struct file *file, struct vm_area_struct *vma) 1744 { 1745 struct address_space *mapping = file->f_mapping; 1746 1747 if (!mapping->a_ops->readpage) 1748 return -ENOEXEC; 1749 file_accessed(file); 1750 vma->vm_ops = &ceph_vmops; 1751 return 0; 1752 } 1753 1754 enum { 1755 POOL_READ = 1, 1756 POOL_WRITE = 2, 1757 }; 1758 1759 static int __ceph_pool_perm_get(struct ceph_inode_info *ci, 1760 s64 pool, struct ceph_string *pool_ns) 1761 { 1762 struct ceph_fs_client *fsc = ceph_inode_to_client(&ci->vfs_inode); 1763 struct ceph_mds_client *mdsc = fsc->mdsc; 1764 struct ceph_osd_request *rd_req = NULL, *wr_req = NULL; 1765 struct rb_node **p, *parent; 1766 struct ceph_pool_perm *perm; 1767 struct page **pages; 1768 size_t pool_ns_len; 1769 int err = 0, err2 = 0, have = 0; 1770 1771 down_read(&mdsc->pool_perm_rwsem); 1772 p = &mdsc->pool_perm_tree.rb_node; 1773 while (*p) { 1774 perm = rb_entry(*p, struct ceph_pool_perm, node); 1775 if (pool < perm->pool) 1776 p = &(*p)->rb_left; 1777 else if (pool > perm->pool) 1778 p = &(*p)->rb_right; 1779 else { 1780 int ret = ceph_compare_string(pool_ns, 1781 perm->pool_ns, 1782 perm->pool_ns_len); 1783 if (ret < 0) 1784 p = &(*p)->rb_left; 1785 else if (ret > 0) 1786 p = &(*p)->rb_right; 1787 else { 1788 have = perm->perm; 1789 break; 1790 } 1791 } 1792 } 1793 up_read(&mdsc->pool_perm_rwsem); 1794 if (*p) 1795 goto out; 1796 1797 if (pool_ns) 1798 dout("__ceph_pool_perm_get pool %lld ns %.*s no perm cached\n", 1799 pool, (int)pool_ns->len, pool_ns->str); 1800 else 1801 dout("__ceph_pool_perm_get pool %lld no perm cached\n", pool); 1802 1803 down_write(&mdsc->pool_perm_rwsem); 1804 p = &mdsc->pool_perm_tree.rb_node; 1805 parent = NULL; 1806 while (*p) { 1807 parent = *p; 1808 perm = rb_entry(parent, struct ceph_pool_perm, node); 1809 if (pool < perm->pool) 1810 p = &(*p)->rb_left; 1811 else if (pool > perm->pool) 1812 p = &(*p)->rb_right; 1813 else { 1814 int ret = ceph_compare_string(pool_ns, 1815 perm->pool_ns, 1816 perm->pool_ns_len); 1817 if (ret < 0) 1818 p = &(*p)->rb_left; 1819 else if (ret > 0) 1820 p = &(*p)->rb_right; 1821 else { 1822 have = perm->perm; 1823 break; 1824 } 1825 } 1826 } 1827 if (*p) { 1828 up_write(&mdsc->pool_perm_rwsem); 1829 goto out; 1830 } 1831 1832 rd_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL, 1833 1, false, GFP_NOFS); 1834 if (!rd_req) { 1835 err = -ENOMEM; 1836 goto out_unlock; 1837 } 1838 1839 rd_req->r_flags = CEPH_OSD_FLAG_READ; 1840 osd_req_op_init(rd_req, 0, CEPH_OSD_OP_STAT, 0); 1841 rd_req->r_base_oloc.pool = pool; 1842 if (pool_ns) 1843 rd_req->r_base_oloc.pool_ns = ceph_get_string(pool_ns); 1844 ceph_oid_printf(&rd_req->r_base_oid, "%llx.00000000", ci->i_vino.ino); 1845 1846 err = ceph_osdc_alloc_messages(rd_req, GFP_NOFS); 1847 if (err) 1848 goto out_unlock; 1849 1850 wr_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL, 1851 1, false, GFP_NOFS); 1852 if (!wr_req) { 1853 err = -ENOMEM; 1854 goto out_unlock; 1855 } 1856 1857 wr_req->r_flags = CEPH_OSD_FLAG_WRITE; 1858 osd_req_op_init(wr_req, 0, CEPH_OSD_OP_CREATE, CEPH_OSD_OP_FLAG_EXCL); 1859 ceph_oloc_copy(&wr_req->r_base_oloc, &rd_req->r_base_oloc); 1860 ceph_oid_copy(&wr_req->r_base_oid, &rd_req->r_base_oid); 1861 1862 err = ceph_osdc_alloc_messages(wr_req, GFP_NOFS); 1863 if (err) 1864 goto out_unlock; 1865 1866 /* one page should be large enough for STAT data */ 1867 pages = ceph_alloc_page_vector(1, GFP_KERNEL); 1868 if (IS_ERR(pages)) { 1869 err = PTR_ERR(pages); 1870 goto out_unlock; 1871 } 1872 1873 osd_req_op_raw_data_in_pages(rd_req, 0, pages, PAGE_SIZE, 1874 0, false, true); 1875 err = ceph_osdc_start_request(&fsc->client->osdc, rd_req, false); 1876 1877 wr_req->r_mtime = ci->vfs_inode.i_mtime; 1878 wr_req->r_abort_on_full = true; 1879 err2 = ceph_osdc_start_request(&fsc->client->osdc, wr_req, false); 1880 1881 if (!err) 1882 err = ceph_osdc_wait_request(&fsc->client->osdc, rd_req); 1883 if (!err2) 1884 err2 = ceph_osdc_wait_request(&fsc->client->osdc, wr_req); 1885 1886 if (err >= 0 || err == -ENOENT) 1887 have |= POOL_READ; 1888 else if (err != -EPERM) 1889 goto out_unlock; 1890 1891 if (err2 == 0 || err2 == -EEXIST) 1892 have |= POOL_WRITE; 1893 else if (err2 != -EPERM) { 1894 err = err2; 1895 goto out_unlock; 1896 } 1897 1898 pool_ns_len = pool_ns ? pool_ns->len : 0; 1899 perm = kmalloc(sizeof(*perm) + pool_ns_len + 1, GFP_NOFS); 1900 if (!perm) { 1901 err = -ENOMEM; 1902 goto out_unlock; 1903 } 1904 1905 perm->pool = pool; 1906 perm->perm = have; 1907 perm->pool_ns_len = pool_ns_len; 1908 if (pool_ns_len > 0) 1909 memcpy(perm->pool_ns, pool_ns->str, pool_ns_len); 1910 perm->pool_ns[pool_ns_len] = 0; 1911 1912 rb_link_node(&perm->node, parent, p); 1913 rb_insert_color(&perm->node, &mdsc->pool_perm_tree); 1914 err = 0; 1915 out_unlock: 1916 up_write(&mdsc->pool_perm_rwsem); 1917 1918 ceph_osdc_put_request(rd_req); 1919 ceph_osdc_put_request(wr_req); 1920 out: 1921 if (!err) 1922 err = have; 1923 if (pool_ns) 1924 dout("__ceph_pool_perm_get pool %lld ns %.*s result = %d\n", 1925 pool, (int)pool_ns->len, pool_ns->str, err); 1926 else 1927 dout("__ceph_pool_perm_get pool %lld result = %d\n", pool, err); 1928 return err; 1929 } 1930 1931 int ceph_pool_perm_check(struct ceph_inode_info *ci, int need) 1932 { 1933 s64 pool; 1934 struct ceph_string *pool_ns; 1935 int ret, flags; 1936 1937 if (ci->i_vino.snap != CEPH_NOSNAP) { 1938 /* 1939 * Pool permission check needs to write to the first object. 1940 * But for snapshot, head of the first object may have alread 1941 * been deleted. Skip check to avoid creating orphan object. 1942 */ 1943 return 0; 1944 } 1945 1946 if (ceph_test_mount_opt(ceph_inode_to_client(&ci->vfs_inode), 1947 NOPOOLPERM)) 1948 return 0; 1949 1950 spin_lock(&ci->i_ceph_lock); 1951 flags = ci->i_ceph_flags; 1952 pool = ci->i_layout.pool_id; 1953 spin_unlock(&ci->i_ceph_lock); 1954 check: 1955 if (flags & CEPH_I_POOL_PERM) { 1956 if ((need & CEPH_CAP_FILE_RD) && !(flags & CEPH_I_POOL_RD)) { 1957 dout("ceph_pool_perm_check pool %lld no read perm\n", 1958 pool); 1959 return -EPERM; 1960 } 1961 if ((need & CEPH_CAP_FILE_WR) && !(flags & CEPH_I_POOL_WR)) { 1962 dout("ceph_pool_perm_check pool %lld no write perm\n", 1963 pool); 1964 return -EPERM; 1965 } 1966 return 0; 1967 } 1968 1969 pool_ns = ceph_try_get_string(ci->i_layout.pool_ns); 1970 ret = __ceph_pool_perm_get(ci, pool, pool_ns); 1971 ceph_put_string(pool_ns); 1972 if (ret < 0) 1973 return ret; 1974 1975 flags = CEPH_I_POOL_PERM; 1976 if (ret & POOL_READ) 1977 flags |= CEPH_I_POOL_RD; 1978 if (ret & POOL_WRITE) 1979 flags |= CEPH_I_POOL_WR; 1980 1981 spin_lock(&ci->i_ceph_lock); 1982 if (pool == ci->i_layout.pool_id && 1983 pool_ns == rcu_dereference_raw(ci->i_layout.pool_ns)) { 1984 ci->i_ceph_flags |= flags; 1985 } else { 1986 pool = ci->i_layout.pool_id; 1987 flags = ci->i_ceph_flags; 1988 } 1989 spin_unlock(&ci->i_ceph_lock); 1990 goto check; 1991 } 1992 1993 void ceph_pool_perm_destroy(struct ceph_mds_client *mdsc) 1994 { 1995 struct ceph_pool_perm *perm; 1996 struct rb_node *n; 1997 1998 while (!RB_EMPTY_ROOT(&mdsc->pool_perm_tree)) { 1999 n = rb_first(&mdsc->pool_perm_tree); 2000 perm = rb_entry(n, struct ceph_pool_perm, node); 2001 rb_erase(n, &mdsc->pool_perm_tree); 2002 kfree(perm); 2003 } 2004 } 2005