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