1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/ceph/ceph_debug.h> 3 4 #include <linux/backing-dev.h> 5 #include <linux/fs.h> 6 #include <linux/mm.h> 7 #include <linux/pagemap.h> 8 #include <linux/writeback.h> /* generic_writepages */ 9 #include <linux/slab.h> 10 #include <linux/pagevec.h> 11 #include <linux/task_io_accounting_ops.h> 12 #include <linux/signal.h> 13 #include <linux/iversion.h> 14 #include <linux/ktime.h> 15 16 #include "super.h" 17 #include "mds_client.h" 18 #include "cache.h" 19 #include "metric.h" 20 #include <linux/ceph/osd_client.h> 21 #include <linux/ceph/striper.h> 22 23 /* 24 * Ceph address space ops. 25 * 26 * There are a few funny things going on here. 27 * 28 * The page->private field is used to reference a struct 29 * ceph_snap_context for _every_ dirty page. This indicates which 30 * snapshot the page was logically dirtied in, and thus which snap 31 * context needs to be associated with the osd write during writeback. 32 * 33 * Similarly, struct ceph_inode_info maintains a set of counters to 34 * count dirty pages on the inode. In the absence of snapshots, 35 * i_wrbuffer_ref == i_wrbuffer_ref_head == the dirty page count. 36 * 37 * When a snapshot is taken (that is, when the client receives 38 * notification that a snapshot was taken), each inode with caps and 39 * with dirty pages (dirty pages implies there is a cap) gets a new 40 * ceph_cap_snap in the i_cap_snaps list (which is sorted in ascending 41 * order, new snaps go to the tail). The i_wrbuffer_ref_head count is 42 * moved to capsnap->dirty. (Unless a sync write is currently in 43 * progress. In that case, the capsnap is said to be "pending", new 44 * writes cannot start, and the capsnap isn't "finalized" until the 45 * write completes (or fails) and a final size/mtime for the inode for 46 * that snap can be settled upon.) i_wrbuffer_ref_head is reset to 0. 47 * 48 * On writeback, we must submit writes to the osd IN SNAP ORDER. So, 49 * we look for the first capsnap in i_cap_snaps and write out pages in 50 * that snap context _only_. Then we move on to the next capsnap, 51 * eventually reaching the "live" or "head" context (i.e., pages that 52 * are not yet snapped) and are writing the most recently dirtied 53 * pages. 54 * 55 * Invalidate and so forth must take care to ensure the dirty page 56 * accounting is preserved. 57 */ 58 59 #define CONGESTION_ON_THRESH(congestion_kb) (congestion_kb >> (PAGE_SHIFT-10)) 60 #define CONGESTION_OFF_THRESH(congestion_kb) \ 61 (CONGESTION_ON_THRESH(congestion_kb) - \ 62 (CONGESTION_ON_THRESH(congestion_kb) >> 2)) 63 64 static inline struct ceph_snap_context *page_snap_context(struct page *page) 65 { 66 if (PagePrivate(page)) 67 return (void *)page->private; 68 return NULL; 69 } 70 71 /* 72 * Dirty a page. Optimistically adjust accounting, on the assumption 73 * that we won't race with invalidate. If we do, readjust. 74 */ 75 static int ceph_set_page_dirty(struct page *page) 76 { 77 struct address_space *mapping = page->mapping; 78 struct inode *inode; 79 struct ceph_inode_info *ci; 80 struct ceph_snap_context *snapc; 81 int ret; 82 83 if (unlikely(!mapping)) 84 return !TestSetPageDirty(page); 85 86 if (PageDirty(page)) { 87 dout("%p set_page_dirty %p idx %lu -- already dirty\n", 88 mapping->host, page, page->index); 89 BUG_ON(!PagePrivate(page)); 90 return 0; 91 } 92 93 inode = mapping->host; 94 ci = ceph_inode(inode); 95 96 /* dirty the head */ 97 spin_lock(&ci->i_ceph_lock); 98 BUG_ON(ci->i_wr_ref == 0); // caller should hold Fw reference 99 if (__ceph_have_pending_cap_snap(ci)) { 100 struct ceph_cap_snap *capsnap = 101 list_last_entry(&ci->i_cap_snaps, 102 struct ceph_cap_snap, 103 ci_item); 104 snapc = ceph_get_snap_context(capsnap->context); 105 capsnap->dirty_pages++; 106 } else { 107 BUG_ON(!ci->i_head_snapc); 108 snapc = ceph_get_snap_context(ci->i_head_snapc); 109 ++ci->i_wrbuffer_ref_head; 110 } 111 if (ci->i_wrbuffer_ref == 0) 112 ihold(inode); 113 ++ci->i_wrbuffer_ref; 114 dout("%p set_page_dirty %p idx %lu head %d/%d -> %d/%d " 115 "snapc %p seq %lld (%d snaps)\n", 116 mapping->host, page, page->index, 117 ci->i_wrbuffer_ref-1, ci->i_wrbuffer_ref_head-1, 118 ci->i_wrbuffer_ref, ci->i_wrbuffer_ref_head, 119 snapc, snapc->seq, snapc->num_snaps); 120 spin_unlock(&ci->i_ceph_lock); 121 122 /* 123 * Reference snap context in page->private. Also set 124 * PagePrivate so that we get invalidatepage callback. 125 */ 126 BUG_ON(PagePrivate(page)); 127 page->private = (unsigned long)snapc; 128 SetPagePrivate(page); 129 130 ret = __set_page_dirty_nobuffers(page); 131 WARN_ON(!PageLocked(page)); 132 WARN_ON(!page->mapping); 133 134 return ret; 135 } 136 137 /* 138 * If we are truncating the full page (i.e. offset == 0), adjust the 139 * dirty page counters appropriately. Only called if there is private 140 * data on the page. 141 */ 142 static void ceph_invalidatepage(struct page *page, unsigned int offset, 143 unsigned int length) 144 { 145 struct inode *inode; 146 struct ceph_inode_info *ci; 147 struct ceph_snap_context *snapc = page_snap_context(page); 148 149 inode = page->mapping->host; 150 ci = ceph_inode(inode); 151 152 if (offset != 0 || length != PAGE_SIZE) { 153 dout("%p invalidatepage %p idx %lu partial dirty page %u~%u\n", 154 inode, page, page->index, offset, length); 155 return; 156 } 157 158 ceph_invalidate_fscache_page(inode, page); 159 160 WARN_ON(!PageLocked(page)); 161 if (!PagePrivate(page)) 162 return; 163 164 dout("%p invalidatepage %p idx %lu full dirty page\n", 165 inode, page, page->index); 166 167 ceph_put_wrbuffer_cap_refs(ci, 1, snapc); 168 ceph_put_snap_context(snapc); 169 page->private = 0; 170 ClearPagePrivate(page); 171 } 172 173 static int ceph_releasepage(struct page *page, gfp_t g) 174 { 175 dout("%p releasepage %p idx %lu (%sdirty)\n", page->mapping->host, 176 page, page->index, PageDirty(page) ? "" : "not "); 177 178 /* Can we release the page from the cache? */ 179 if (!ceph_release_fscache_page(page, g)) 180 return 0; 181 182 return !PagePrivate(page); 183 } 184 185 /* 186 * Read some contiguous pages. If we cross a stripe boundary, shorten 187 * *plen. Return number of bytes read, or error. 188 */ 189 static int ceph_sync_readpages(struct ceph_fs_client *fsc, 190 struct ceph_vino vino, 191 struct ceph_file_layout *layout, 192 u64 off, u64 *plen, 193 u32 truncate_seq, u64 truncate_size, 194 struct page **pages, int num_pages, 195 int page_align) 196 { 197 struct ceph_osd_client *osdc = &fsc->client->osdc; 198 struct ceph_osd_request *req; 199 int rc = 0; 200 201 dout("readpages on ino %llx.%llx on %llu~%llu\n", vino.ino, 202 vino.snap, off, *plen); 203 req = ceph_osdc_new_request(osdc, layout, vino, off, plen, 0, 1, 204 CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ, 205 NULL, truncate_seq, truncate_size, 206 false); 207 if (IS_ERR(req)) 208 return PTR_ERR(req); 209 210 /* it may be a short read due to an object boundary */ 211 osd_req_op_extent_osd_data_pages(req, 0, 212 pages, *plen, page_align, false, false); 213 214 dout("readpages final extent is %llu~%llu (%llu bytes align %d)\n", 215 off, *plen, *plen, page_align); 216 217 rc = ceph_osdc_start_request(osdc, req, false); 218 if (!rc) 219 rc = ceph_osdc_wait_request(osdc, req); 220 221 ceph_update_read_latency(&fsc->mdsc->metric, req->r_start_latency, 222 req->r_end_latency, rc); 223 224 ceph_osdc_put_request(req); 225 dout("readpages result %d\n", rc); 226 return rc; 227 } 228 229 /* 230 * read a single page, without unlocking it. 231 */ 232 static int ceph_do_readpage(struct file *filp, struct page *page) 233 { 234 struct inode *inode = file_inode(filp); 235 struct ceph_inode_info *ci = ceph_inode(inode); 236 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 237 int err = 0; 238 u64 off = page_offset(page); 239 u64 len = PAGE_SIZE; 240 241 if (off >= i_size_read(inode)) { 242 zero_user_segment(page, 0, PAGE_SIZE); 243 SetPageUptodate(page); 244 return 0; 245 } 246 247 if (ci->i_inline_version != CEPH_INLINE_NONE) { 248 /* 249 * Uptodate inline data should have been added 250 * into page cache while getting Fcr caps. 251 */ 252 if (off == 0) 253 return -EINVAL; 254 zero_user_segment(page, 0, PAGE_SIZE); 255 SetPageUptodate(page); 256 return 0; 257 } 258 259 err = ceph_readpage_from_fscache(inode, page); 260 if (err == 0) 261 return -EINPROGRESS; 262 263 dout("readpage inode %p file %p page %p index %lu\n", 264 inode, filp, page, page->index); 265 err = ceph_sync_readpages(fsc, ceph_vino(inode), 266 &ci->i_layout, off, &len, 267 ci->i_truncate_seq, ci->i_truncate_size, 268 &page, 1, 0); 269 if (err == -ENOENT) 270 err = 0; 271 if (err < 0) { 272 SetPageError(page); 273 ceph_fscache_readpage_cancel(inode, page); 274 if (err == -EBLOCKLISTED) 275 fsc->blocklisted = true; 276 goto out; 277 } 278 if (err < PAGE_SIZE) 279 /* zero fill remainder of page */ 280 zero_user_segment(page, err, PAGE_SIZE); 281 else 282 flush_dcache_page(page); 283 284 SetPageUptodate(page); 285 ceph_readpage_to_fscache(inode, page); 286 287 out: 288 return err < 0 ? err : 0; 289 } 290 291 static int ceph_readpage(struct file *filp, struct page *page) 292 { 293 int r = ceph_do_readpage(filp, page); 294 if (r != -EINPROGRESS) 295 unlock_page(page); 296 else 297 r = 0; 298 return r; 299 } 300 301 /* 302 * Finish an async read(ahead) op. 303 */ 304 static void finish_read(struct ceph_osd_request *req) 305 { 306 struct inode *inode = req->r_inode; 307 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 308 struct ceph_osd_data *osd_data; 309 int rc = req->r_result <= 0 ? req->r_result : 0; 310 int bytes = req->r_result >= 0 ? req->r_result : 0; 311 int num_pages; 312 int i; 313 314 dout("finish_read %p req %p rc %d bytes %d\n", inode, req, rc, bytes); 315 if (rc == -EBLOCKLISTED) 316 ceph_inode_to_client(inode)->blocklisted = true; 317 318 /* unlock all pages, zeroing any data we didn't read */ 319 osd_data = osd_req_op_extent_osd_data(req, 0); 320 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES); 321 num_pages = calc_pages_for((u64)osd_data->alignment, 322 (u64)osd_data->length); 323 for (i = 0; i < num_pages; i++) { 324 struct page *page = osd_data->pages[i]; 325 326 if (rc < 0 && rc != -ENOENT) { 327 ceph_fscache_readpage_cancel(inode, page); 328 goto unlock; 329 } 330 if (bytes < (int)PAGE_SIZE) { 331 /* zero (remainder of) page */ 332 int s = bytes < 0 ? 0 : bytes; 333 zero_user_segment(page, s, PAGE_SIZE); 334 } 335 dout("finish_read %p uptodate %p idx %lu\n", inode, page, 336 page->index); 337 flush_dcache_page(page); 338 SetPageUptodate(page); 339 ceph_readpage_to_fscache(inode, page); 340 unlock: 341 unlock_page(page); 342 put_page(page); 343 bytes -= PAGE_SIZE; 344 } 345 346 ceph_update_read_latency(&fsc->mdsc->metric, req->r_start_latency, 347 req->r_end_latency, rc); 348 349 kfree(osd_data->pages); 350 } 351 352 /* 353 * start an async read(ahead) operation. return nr_pages we submitted 354 * a read for on success, or negative error code. 355 */ 356 static int start_read(struct inode *inode, struct ceph_rw_context *rw_ctx, 357 struct list_head *page_list, int max) 358 { 359 struct ceph_osd_client *osdc = 360 &ceph_inode_to_client(inode)->client->osdc; 361 struct ceph_inode_info *ci = ceph_inode(inode); 362 struct page *page = lru_to_page(page_list); 363 struct ceph_vino vino; 364 struct ceph_osd_request *req; 365 u64 off; 366 u64 len; 367 int i; 368 struct page **pages; 369 pgoff_t next_index; 370 int nr_pages = 0; 371 int got = 0; 372 int ret = 0; 373 374 if (!rw_ctx) { 375 /* caller of readpages does not hold buffer and read caps 376 * (fadvise, madvise and readahead cases) */ 377 int want = CEPH_CAP_FILE_CACHE; 378 ret = ceph_try_get_caps(inode, CEPH_CAP_FILE_RD, want, 379 true, &got); 380 if (ret < 0) { 381 dout("start_read %p, error getting cap\n", inode); 382 } else if (!(got & want)) { 383 dout("start_read %p, no cache cap\n", inode); 384 ret = 0; 385 } 386 if (ret <= 0) { 387 if (got) 388 ceph_put_cap_refs(ci, got); 389 while (!list_empty(page_list)) { 390 page = lru_to_page(page_list); 391 list_del(&page->lru); 392 put_page(page); 393 } 394 return ret; 395 } 396 } 397 398 off = (u64) page_offset(page); 399 400 /* count pages */ 401 next_index = page->index; 402 list_for_each_entry_reverse(page, page_list, lru) { 403 if (page->index != next_index) 404 break; 405 nr_pages++; 406 next_index++; 407 if (max && nr_pages == max) 408 break; 409 } 410 len = nr_pages << PAGE_SHIFT; 411 dout("start_read %p nr_pages %d is %lld~%lld\n", inode, nr_pages, 412 off, len); 413 vino = ceph_vino(inode); 414 req = ceph_osdc_new_request(osdc, &ci->i_layout, vino, off, &len, 415 0, 1, CEPH_OSD_OP_READ, 416 CEPH_OSD_FLAG_READ, NULL, 417 ci->i_truncate_seq, ci->i_truncate_size, 418 false); 419 if (IS_ERR(req)) { 420 ret = PTR_ERR(req); 421 goto out; 422 } 423 424 /* build page vector */ 425 nr_pages = calc_pages_for(0, len); 426 pages = kmalloc_array(nr_pages, sizeof(*pages), GFP_KERNEL); 427 if (!pages) { 428 ret = -ENOMEM; 429 goto out_put; 430 } 431 for (i = 0; i < nr_pages; ++i) { 432 page = list_entry(page_list->prev, struct page, lru); 433 BUG_ON(PageLocked(page)); 434 list_del(&page->lru); 435 436 dout("start_read %p adding %p idx %lu\n", inode, page, 437 page->index); 438 if (add_to_page_cache_lru(page, &inode->i_data, page->index, 439 GFP_KERNEL)) { 440 ceph_fscache_uncache_page(inode, page); 441 put_page(page); 442 dout("start_read %p add_to_page_cache failed %p\n", 443 inode, page); 444 nr_pages = i; 445 if (nr_pages > 0) { 446 len = nr_pages << PAGE_SHIFT; 447 osd_req_op_extent_update(req, 0, len); 448 break; 449 } 450 goto out_pages; 451 } 452 pages[i] = page; 453 } 454 osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0, false, false); 455 req->r_callback = finish_read; 456 req->r_inode = inode; 457 458 dout("start_read %p starting %p %lld~%lld\n", inode, req, off, len); 459 ret = ceph_osdc_start_request(osdc, req, false); 460 if (ret < 0) 461 goto out_pages; 462 ceph_osdc_put_request(req); 463 464 /* After adding locked pages to page cache, the inode holds cache cap. 465 * So we can drop our cap refs. */ 466 if (got) 467 ceph_put_cap_refs(ci, got); 468 469 return nr_pages; 470 471 out_pages: 472 for (i = 0; i < nr_pages; ++i) { 473 ceph_fscache_readpage_cancel(inode, pages[i]); 474 unlock_page(pages[i]); 475 } 476 ceph_put_page_vector(pages, nr_pages, false); 477 out_put: 478 ceph_osdc_put_request(req); 479 out: 480 if (got) 481 ceph_put_cap_refs(ci, got); 482 return ret; 483 } 484 485 486 /* 487 * Read multiple pages. Leave pages we don't read + unlock in page_list; 488 * the caller (VM) cleans them up. 489 */ 490 static int ceph_readpages(struct file *file, struct address_space *mapping, 491 struct list_head *page_list, unsigned nr_pages) 492 { 493 struct inode *inode = file_inode(file); 494 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 495 struct ceph_file_info *fi = file->private_data; 496 struct ceph_rw_context *rw_ctx; 497 int rc = 0; 498 int max = 0; 499 500 if (ceph_inode(inode)->i_inline_version != CEPH_INLINE_NONE) 501 return -EINVAL; 502 503 rc = ceph_readpages_from_fscache(mapping->host, mapping, page_list, 504 &nr_pages); 505 506 if (rc == 0) 507 goto out; 508 509 rw_ctx = ceph_find_rw_context(fi); 510 max = fsc->mount_options->rsize >> PAGE_SHIFT; 511 dout("readpages %p file %p ctx %p nr_pages %d max %d\n", 512 inode, file, rw_ctx, nr_pages, max); 513 while (!list_empty(page_list)) { 514 rc = start_read(inode, rw_ctx, page_list, max); 515 if (rc < 0) 516 goto out; 517 } 518 out: 519 ceph_fscache_readpages_cancel(inode, page_list); 520 521 dout("readpages %p file %p ret %d\n", inode, file, rc); 522 return rc; 523 } 524 525 struct ceph_writeback_ctl 526 { 527 loff_t i_size; 528 u64 truncate_size; 529 u32 truncate_seq; 530 bool size_stable; 531 bool head_snapc; 532 }; 533 534 /* 535 * Get ref for the oldest snapc for an inode with dirty data... that is, the 536 * only snap context we are allowed to write back. 537 */ 538 static struct ceph_snap_context * 539 get_oldest_context(struct inode *inode, struct ceph_writeback_ctl *ctl, 540 struct ceph_snap_context *page_snapc) 541 { 542 struct ceph_inode_info *ci = ceph_inode(inode); 543 struct ceph_snap_context *snapc = NULL; 544 struct ceph_cap_snap *capsnap = NULL; 545 546 spin_lock(&ci->i_ceph_lock); 547 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) { 548 dout(" cap_snap %p snapc %p has %d dirty pages\n", capsnap, 549 capsnap->context, capsnap->dirty_pages); 550 if (!capsnap->dirty_pages) 551 continue; 552 553 /* get i_size, truncate_{seq,size} for page_snapc? */ 554 if (snapc && capsnap->context != page_snapc) 555 continue; 556 557 if (ctl) { 558 if (capsnap->writing) { 559 ctl->i_size = i_size_read(inode); 560 ctl->size_stable = false; 561 } else { 562 ctl->i_size = capsnap->size; 563 ctl->size_stable = true; 564 } 565 ctl->truncate_size = capsnap->truncate_size; 566 ctl->truncate_seq = capsnap->truncate_seq; 567 ctl->head_snapc = false; 568 } 569 570 if (snapc) 571 break; 572 573 snapc = ceph_get_snap_context(capsnap->context); 574 if (!page_snapc || 575 page_snapc == snapc || 576 page_snapc->seq > snapc->seq) 577 break; 578 } 579 if (!snapc && ci->i_wrbuffer_ref_head) { 580 snapc = ceph_get_snap_context(ci->i_head_snapc); 581 dout(" head snapc %p has %d dirty pages\n", 582 snapc, ci->i_wrbuffer_ref_head); 583 if (ctl) { 584 ctl->i_size = i_size_read(inode); 585 ctl->truncate_size = ci->i_truncate_size; 586 ctl->truncate_seq = ci->i_truncate_seq; 587 ctl->size_stable = false; 588 ctl->head_snapc = true; 589 } 590 } 591 spin_unlock(&ci->i_ceph_lock); 592 return snapc; 593 } 594 595 static u64 get_writepages_data_length(struct inode *inode, 596 struct page *page, u64 start) 597 { 598 struct ceph_inode_info *ci = ceph_inode(inode); 599 struct ceph_snap_context *snapc = page_snap_context(page); 600 struct ceph_cap_snap *capsnap = NULL; 601 u64 end = i_size_read(inode); 602 603 if (snapc != ci->i_head_snapc) { 604 bool found = false; 605 spin_lock(&ci->i_ceph_lock); 606 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) { 607 if (capsnap->context == snapc) { 608 if (!capsnap->writing) 609 end = capsnap->size; 610 found = true; 611 break; 612 } 613 } 614 spin_unlock(&ci->i_ceph_lock); 615 WARN_ON(!found); 616 } 617 if (end > page_offset(page) + PAGE_SIZE) 618 end = page_offset(page) + PAGE_SIZE; 619 return end > start ? end - start : 0; 620 } 621 622 /* 623 * do a synchronous write on N pages 624 */ 625 static int ceph_sync_writepages(struct ceph_fs_client *fsc, 626 struct ceph_vino vino, 627 struct ceph_file_layout *layout, 628 struct ceph_snap_context *snapc, 629 u64 off, u64 len, 630 u32 truncate_seq, u64 truncate_size, 631 struct timespec64 *mtime, 632 struct page **pages, int num_pages) 633 { 634 struct ceph_osd_client *osdc = &fsc->client->osdc; 635 struct ceph_osd_request *req; 636 int rc = 0; 637 int page_align = off & ~PAGE_MASK; 638 639 req = ceph_osdc_new_request(osdc, layout, vino, off, &len, 0, 1, 640 CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE, 641 snapc, truncate_seq, truncate_size, 642 true); 643 if (IS_ERR(req)) 644 return PTR_ERR(req); 645 646 /* it may be a short write due to an object boundary */ 647 osd_req_op_extent_osd_data_pages(req, 0, pages, len, page_align, 648 false, false); 649 dout("writepages %llu~%llu (%llu bytes)\n", off, len, len); 650 651 req->r_mtime = *mtime; 652 rc = ceph_osdc_start_request(osdc, req, true); 653 if (!rc) 654 rc = ceph_osdc_wait_request(osdc, req); 655 656 ceph_update_write_latency(&fsc->mdsc->metric, req->r_start_latency, 657 req->r_end_latency, rc); 658 659 ceph_osdc_put_request(req); 660 if (rc == 0) 661 rc = len; 662 dout("writepages result %d\n", rc); 663 return rc; 664 } 665 666 /* 667 * Write a single page, but leave the page locked. 668 * 669 * If we get a write error, mark the mapping for error, but still adjust the 670 * dirty page accounting (i.e., page is no longer dirty). 671 */ 672 static int writepage_nounlock(struct page *page, struct writeback_control *wbc) 673 { 674 struct inode *inode; 675 struct ceph_inode_info *ci; 676 struct ceph_fs_client *fsc; 677 struct ceph_snap_context *snapc, *oldest; 678 loff_t page_off = page_offset(page); 679 int err, len = PAGE_SIZE; 680 struct ceph_writeback_ctl ceph_wbc; 681 682 dout("writepage %p idx %lu\n", page, page->index); 683 684 inode = page->mapping->host; 685 ci = ceph_inode(inode); 686 fsc = ceph_inode_to_client(inode); 687 688 /* verify this is a writeable snap context */ 689 snapc = page_snap_context(page); 690 if (!snapc) { 691 dout("writepage %p page %p not dirty?\n", inode, page); 692 return 0; 693 } 694 oldest = get_oldest_context(inode, &ceph_wbc, snapc); 695 if (snapc->seq > oldest->seq) { 696 dout("writepage %p page %p snapc %p not writeable - noop\n", 697 inode, page, snapc); 698 /* we should only noop if called by kswapd */ 699 WARN_ON(!(current->flags & PF_MEMALLOC)); 700 ceph_put_snap_context(oldest); 701 redirty_page_for_writepage(wbc, page); 702 return 0; 703 } 704 ceph_put_snap_context(oldest); 705 706 /* is this a partial page at end of file? */ 707 if (page_off >= ceph_wbc.i_size) { 708 dout("%p page eof %llu\n", page, ceph_wbc.i_size); 709 page->mapping->a_ops->invalidatepage(page, 0, PAGE_SIZE); 710 return 0; 711 } 712 713 if (ceph_wbc.i_size < page_off + len) 714 len = ceph_wbc.i_size - page_off; 715 716 dout("writepage %p page %p index %lu on %llu~%u snapc %p seq %lld\n", 717 inode, page, page->index, page_off, len, snapc, snapc->seq); 718 719 if (atomic_long_inc_return(&fsc->writeback_count) > 720 CONGESTION_ON_THRESH(fsc->mount_options->congestion_kb)) 721 set_bdi_congested(inode_to_bdi(inode), BLK_RW_ASYNC); 722 723 set_page_writeback(page); 724 err = ceph_sync_writepages(fsc, ceph_vino(inode), 725 &ci->i_layout, snapc, page_off, len, 726 ceph_wbc.truncate_seq, 727 ceph_wbc.truncate_size, 728 &inode->i_mtime, &page, 1); 729 if (err < 0) { 730 struct writeback_control tmp_wbc; 731 if (!wbc) 732 wbc = &tmp_wbc; 733 if (err == -ERESTARTSYS) { 734 /* killed by SIGKILL */ 735 dout("writepage interrupted page %p\n", page); 736 redirty_page_for_writepage(wbc, page); 737 end_page_writeback(page); 738 return err; 739 } 740 if (err == -EBLOCKLISTED) 741 fsc->blocklisted = true; 742 dout("writepage setting page/mapping error %d %p\n", 743 err, page); 744 mapping_set_error(&inode->i_data, err); 745 wbc->pages_skipped++; 746 } else { 747 dout("writepage cleaned page %p\n", page); 748 err = 0; /* vfs expects us to return 0 */ 749 } 750 page->private = 0; 751 ClearPagePrivate(page); 752 end_page_writeback(page); 753 ceph_put_wrbuffer_cap_refs(ci, 1, snapc); 754 ceph_put_snap_context(snapc); /* page's reference */ 755 756 if (atomic_long_dec_return(&fsc->writeback_count) < 757 CONGESTION_OFF_THRESH(fsc->mount_options->congestion_kb)) 758 clear_bdi_congested(inode_to_bdi(inode), BLK_RW_ASYNC); 759 760 return err; 761 } 762 763 static int ceph_writepage(struct page *page, struct writeback_control *wbc) 764 { 765 int err; 766 struct inode *inode = page->mapping->host; 767 BUG_ON(!inode); 768 ihold(inode); 769 err = writepage_nounlock(page, wbc); 770 if (err == -ERESTARTSYS) { 771 /* direct memory reclaimer was killed by SIGKILL. return 0 772 * to prevent caller from setting mapping/page error */ 773 err = 0; 774 } 775 unlock_page(page); 776 iput(inode); 777 return err; 778 } 779 780 /* 781 * async writeback completion handler. 782 * 783 * If we get an error, set the mapping error bit, but not the individual 784 * page error bits. 785 */ 786 static void writepages_finish(struct ceph_osd_request *req) 787 { 788 struct inode *inode = req->r_inode; 789 struct ceph_inode_info *ci = ceph_inode(inode); 790 struct ceph_osd_data *osd_data; 791 struct page *page; 792 int num_pages, total_pages = 0; 793 int i, j; 794 int rc = req->r_result; 795 struct ceph_snap_context *snapc = req->r_snapc; 796 struct address_space *mapping = inode->i_mapping; 797 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 798 bool remove_page; 799 800 dout("writepages_finish %p rc %d\n", inode, rc); 801 if (rc < 0) { 802 mapping_set_error(mapping, rc); 803 ceph_set_error_write(ci); 804 if (rc == -EBLOCKLISTED) 805 fsc->blocklisted = true; 806 } else { 807 ceph_clear_error_write(ci); 808 } 809 810 ceph_update_write_latency(&fsc->mdsc->metric, req->r_start_latency, 811 req->r_end_latency, rc); 812 813 /* 814 * We lost the cache cap, need to truncate the page before 815 * it is unlocked, otherwise we'd truncate it later in the 816 * page truncation thread, possibly losing some data that 817 * raced its way in 818 */ 819 remove_page = !(ceph_caps_issued(ci) & 820 (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)); 821 822 /* clean all pages */ 823 for (i = 0; i < req->r_num_ops; i++) { 824 if (req->r_ops[i].op != CEPH_OSD_OP_WRITE) 825 break; 826 827 osd_data = osd_req_op_extent_osd_data(req, i); 828 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES); 829 num_pages = calc_pages_for((u64)osd_data->alignment, 830 (u64)osd_data->length); 831 total_pages += num_pages; 832 for (j = 0; j < num_pages; j++) { 833 page = osd_data->pages[j]; 834 BUG_ON(!page); 835 WARN_ON(!PageUptodate(page)); 836 837 if (atomic_long_dec_return(&fsc->writeback_count) < 838 CONGESTION_OFF_THRESH( 839 fsc->mount_options->congestion_kb)) 840 clear_bdi_congested(inode_to_bdi(inode), 841 BLK_RW_ASYNC); 842 843 ceph_put_snap_context(page_snap_context(page)); 844 page->private = 0; 845 ClearPagePrivate(page); 846 dout("unlocking %p\n", page); 847 end_page_writeback(page); 848 849 if (remove_page) 850 generic_error_remove_page(inode->i_mapping, 851 page); 852 853 unlock_page(page); 854 } 855 dout("writepages_finish %p wrote %llu bytes cleaned %d pages\n", 856 inode, osd_data->length, rc >= 0 ? num_pages : 0); 857 858 release_pages(osd_data->pages, num_pages); 859 } 860 861 ceph_put_wrbuffer_cap_refs(ci, total_pages, snapc); 862 863 osd_data = osd_req_op_extent_osd_data(req, 0); 864 if (osd_data->pages_from_pool) 865 mempool_free(osd_data->pages, ceph_wb_pagevec_pool); 866 else 867 kfree(osd_data->pages); 868 ceph_osdc_put_request(req); 869 } 870 871 /* 872 * initiate async writeback 873 */ 874 static int ceph_writepages_start(struct address_space *mapping, 875 struct writeback_control *wbc) 876 { 877 struct inode *inode = mapping->host; 878 struct ceph_inode_info *ci = ceph_inode(inode); 879 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 880 struct ceph_vino vino = ceph_vino(inode); 881 pgoff_t index, start_index, end = -1; 882 struct ceph_snap_context *snapc = NULL, *last_snapc = NULL, *pgsnapc; 883 struct pagevec pvec; 884 int rc = 0; 885 unsigned int wsize = i_blocksize(inode); 886 struct ceph_osd_request *req = NULL; 887 struct ceph_writeback_ctl ceph_wbc; 888 bool should_loop, range_whole = false; 889 bool done = false; 890 891 dout("writepages_start %p (mode=%s)\n", inode, 892 wbc->sync_mode == WB_SYNC_NONE ? "NONE" : 893 (wbc->sync_mode == WB_SYNC_ALL ? "ALL" : "HOLD")); 894 895 if (READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) { 896 if (ci->i_wrbuffer_ref > 0) { 897 pr_warn_ratelimited( 898 "writepage_start %p %lld forced umount\n", 899 inode, ceph_ino(inode)); 900 } 901 mapping_set_error(mapping, -EIO); 902 return -EIO; /* we're in a forced umount, don't write! */ 903 } 904 if (fsc->mount_options->wsize < wsize) 905 wsize = fsc->mount_options->wsize; 906 907 pagevec_init(&pvec); 908 909 start_index = wbc->range_cyclic ? mapping->writeback_index : 0; 910 index = start_index; 911 912 retry: 913 /* find oldest snap context with dirty data */ 914 snapc = get_oldest_context(inode, &ceph_wbc, NULL); 915 if (!snapc) { 916 /* hmm, why does writepages get called when there 917 is no dirty data? */ 918 dout(" no snap context with dirty data?\n"); 919 goto out; 920 } 921 dout(" oldest snapc is %p seq %lld (%d snaps)\n", 922 snapc, snapc->seq, snapc->num_snaps); 923 924 should_loop = false; 925 if (ceph_wbc.head_snapc && snapc != last_snapc) { 926 /* where to start/end? */ 927 if (wbc->range_cyclic) { 928 index = start_index; 929 end = -1; 930 if (index > 0) 931 should_loop = true; 932 dout(" cyclic, start at %lu\n", index); 933 } else { 934 index = wbc->range_start >> PAGE_SHIFT; 935 end = wbc->range_end >> PAGE_SHIFT; 936 if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) 937 range_whole = true; 938 dout(" not cyclic, %lu to %lu\n", index, end); 939 } 940 } else if (!ceph_wbc.head_snapc) { 941 /* Do not respect wbc->range_{start,end}. Dirty pages 942 * in that range can be associated with newer snapc. 943 * They are not writeable until we write all dirty pages 944 * associated with 'snapc' get written */ 945 if (index > 0) 946 should_loop = true; 947 dout(" non-head snapc, range whole\n"); 948 } 949 950 ceph_put_snap_context(last_snapc); 951 last_snapc = snapc; 952 953 while (!done && index <= end) { 954 int num_ops = 0, op_idx; 955 unsigned i, pvec_pages, max_pages, locked_pages = 0; 956 struct page **pages = NULL, **data_pages; 957 struct page *page; 958 pgoff_t strip_unit_end = 0; 959 u64 offset = 0, len = 0; 960 bool from_pool = false; 961 962 max_pages = wsize >> PAGE_SHIFT; 963 964 get_more_pages: 965 pvec_pages = pagevec_lookup_range_tag(&pvec, mapping, &index, 966 end, PAGECACHE_TAG_DIRTY); 967 dout("pagevec_lookup_range_tag got %d\n", pvec_pages); 968 if (!pvec_pages && !locked_pages) 969 break; 970 for (i = 0; i < pvec_pages && locked_pages < max_pages; i++) { 971 page = pvec.pages[i]; 972 dout("? %p idx %lu\n", page, page->index); 973 if (locked_pages == 0) 974 lock_page(page); /* first page */ 975 else if (!trylock_page(page)) 976 break; 977 978 /* only dirty pages, or our accounting breaks */ 979 if (unlikely(!PageDirty(page)) || 980 unlikely(page->mapping != mapping)) { 981 dout("!dirty or !mapping %p\n", page); 982 unlock_page(page); 983 continue; 984 } 985 /* only if matching snap context */ 986 pgsnapc = page_snap_context(page); 987 if (pgsnapc != snapc) { 988 dout("page snapc %p %lld != oldest %p %lld\n", 989 pgsnapc, pgsnapc->seq, snapc, snapc->seq); 990 if (!should_loop && 991 !ceph_wbc.head_snapc && 992 wbc->sync_mode != WB_SYNC_NONE) 993 should_loop = true; 994 unlock_page(page); 995 continue; 996 } 997 if (page_offset(page) >= ceph_wbc.i_size) { 998 dout("%p page eof %llu\n", 999 page, ceph_wbc.i_size); 1000 if ((ceph_wbc.size_stable || 1001 page_offset(page) >= i_size_read(inode)) && 1002 clear_page_dirty_for_io(page)) 1003 mapping->a_ops->invalidatepage(page, 1004 0, PAGE_SIZE); 1005 unlock_page(page); 1006 continue; 1007 } 1008 if (strip_unit_end && (page->index > strip_unit_end)) { 1009 dout("end of strip unit %p\n", page); 1010 unlock_page(page); 1011 break; 1012 } 1013 if (PageWriteback(page)) { 1014 if (wbc->sync_mode == WB_SYNC_NONE) { 1015 dout("%p under writeback\n", page); 1016 unlock_page(page); 1017 continue; 1018 } 1019 dout("waiting on writeback %p\n", page); 1020 wait_on_page_writeback(page); 1021 } 1022 1023 if (!clear_page_dirty_for_io(page)) { 1024 dout("%p !clear_page_dirty_for_io\n", page); 1025 unlock_page(page); 1026 continue; 1027 } 1028 1029 /* 1030 * We have something to write. If this is 1031 * the first locked page this time through, 1032 * calculate max possinle write size and 1033 * allocate a page array 1034 */ 1035 if (locked_pages == 0) { 1036 u64 objnum; 1037 u64 objoff; 1038 u32 xlen; 1039 1040 /* prepare async write request */ 1041 offset = (u64)page_offset(page); 1042 ceph_calc_file_object_mapping(&ci->i_layout, 1043 offset, wsize, 1044 &objnum, &objoff, 1045 &xlen); 1046 len = xlen; 1047 1048 num_ops = 1; 1049 strip_unit_end = page->index + 1050 ((len - 1) >> PAGE_SHIFT); 1051 1052 BUG_ON(pages); 1053 max_pages = calc_pages_for(0, (u64)len); 1054 pages = kmalloc_array(max_pages, 1055 sizeof(*pages), 1056 GFP_NOFS); 1057 if (!pages) { 1058 from_pool = true; 1059 pages = mempool_alloc(ceph_wb_pagevec_pool, GFP_NOFS); 1060 BUG_ON(!pages); 1061 } 1062 1063 len = 0; 1064 } else if (page->index != 1065 (offset + len) >> PAGE_SHIFT) { 1066 if (num_ops >= (from_pool ? CEPH_OSD_SLAB_OPS : 1067 CEPH_OSD_MAX_OPS)) { 1068 redirty_page_for_writepage(wbc, page); 1069 unlock_page(page); 1070 break; 1071 } 1072 1073 num_ops++; 1074 offset = (u64)page_offset(page); 1075 len = 0; 1076 } 1077 1078 /* note position of first page in pvec */ 1079 dout("%p will write page %p idx %lu\n", 1080 inode, page, page->index); 1081 1082 if (atomic_long_inc_return(&fsc->writeback_count) > 1083 CONGESTION_ON_THRESH( 1084 fsc->mount_options->congestion_kb)) { 1085 set_bdi_congested(inode_to_bdi(inode), 1086 BLK_RW_ASYNC); 1087 } 1088 1089 1090 pages[locked_pages++] = page; 1091 pvec.pages[i] = NULL; 1092 1093 len += PAGE_SIZE; 1094 } 1095 1096 /* did we get anything? */ 1097 if (!locked_pages) 1098 goto release_pvec_pages; 1099 if (i) { 1100 unsigned j, n = 0; 1101 /* shift unused page to beginning of pvec */ 1102 for (j = 0; j < pvec_pages; j++) { 1103 if (!pvec.pages[j]) 1104 continue; 1105 if (n < j) 1106 pvec.pages[n] = pvec.pages[j]; 1107 n++; 1108 } 1109 pvec.nr = n; 1110 1111 if (pvec_pages && i == pvec_pages && 1112 locked_pages < max_pages) { 1113 dout("reached end pvec, trying for more\n"); 1114 pagevec_release(&pvec); 1115 goto get_more_pages; 1116 } 1117 } 1118 1119 new_request: 1120 offset = page_offset(pages[0]); 1121 len = wsize; 1122 1123 req = ceph_osdc_new_request(&fsc->client->osdc, 1124 &ci->i_layout, vino, 1125 offset, &len, 0, num_ops, 1126 CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE, 1127 snapc, ceph_wbc.truncate_seq, 1128 ceph_wbc.truncate_size, false); 1129 if (IS_ERR(req)) { 1130 req = ceph_osdc_new_request(&fsc->client->osdc, 1131 &ci->i_layout, vino, 1132 offset, &len, 0, 1133 min(num_ops, 1134 CEPH_OSD_SLAB_OPS), 1135 CEPH_OSD_OP_WRITE, 1136 CEPH_OSD_FLAG_WRITE, 1137 snapc, ceph_wbc.truncate_seq, 1138 ceph_wbc.truncate_size, true); 1139 BUG_ON(IS_ERR(req)); 1140 } 1141 BUG_ON(len < page_offset(pages[locked_pages - 1]) + 1142 PAGE_SIZE - offset); 1143 1144 req->r_callback = writepages_finish; 1145 req->r_inode = inode; 1146 1147 /* Format the osd request message and submit the write */ 1148 len = 0; 1149 data_pages = pages; 1150 op_idx = 0; 1151 for (i = 0; i < locked_pages; i++) { 1152 u64 cur_offset = page_offset(pages[i]); 1153 if (offset + len != cur_offset) { 1154 if (op_idx + 1 == req->r_num_ops) 1155 break; 1156 osd_req_op_extent_dup_last(req, op_idx, 1157 cur_offset - offset); 1158 dout("writepages got pages at %llu~%llu\n", 1159 offset, len); 1160 osd_req_op_extent_osd_data_pages(req, op_idx, 1161 data_pages, len, 0, 1162 from_pool, false); 1163 osd_req_op_extent_update(req, op_idx, len); 1164 1165 len = 0; 1166 offset = cur_offset; 1167 data_pages = pages + i; 1168 op_idx++; 1169 } 1170 1171 set_page_writeback(pages[i]); 1172 len += PAGE_SIZE; 1173 } 1174 1175 if (ceph_wbc.size_stable) { 1176 len = min(len, ceph_wbc.i_size - offset); 1177 } else if (i == locked_pages) { 1178 /* writepages_finish() clears writeback pages 1179 * according to the data length, so make sure 1180 * data length covers all locked pages */ 1181 u64 min_len = len + 1 - PAGE_SIZE; 1182 len = get_writepages_data_length(inode, pages[i - 1], 1183 offset); 1184 len = max(len, min_len); 1185 } 1186 dout("writepages got pages at %llu~%llu\n", offset, len); 1187 1188 osd_req_op_extent_osd_data_pages(req, op_idx, data_pages, len, 1189 0, from_pool, false); 1190 osd_req_op_extent_update(req, op_idx, len); 1191 1192 BUG_ON(op_idx + 1 != req->r_num_ops); 1193 1194 from_pool = false; 1195 if (i < locked_pages) { 1196 BUG_ON(num_ops <= req->r_num_ops); 1197 num_ops -= req->r_num_ops; 1198 locked_pages -= i; 1199 1200 /* allocate new pages array for next request */ 1201 data_pages = pages; 1202 pages = kmalloc_array(locked_pages, sizeof(*pages), 1203 GFP_NOFS); 1204 if (!pages) { 1205 from_pool = true; 1206 pages = mempool_alloc(ceph_wb_pagevec_pool, GFP_NOFS); 1207 BUG_ON(!pages); 1208 } 1209 memcpy(pages, data_pages + i, 1210 locked_pages * sizeof(*pages)); 1211 memset(data_pages + i, 0, 1212 locked_pages * sizeof(*pages)); 1213 } else { 1214 BUG_ON(num_ops != req->r_num_ops); 1215 index = pages[i - 1]->index + 1; 1216 /* request message now owns the pages array */ 1217 pages = NULL; 1218 } 1219 1220 req->r_mtime = inode->i_mtime; 1221 rc = ceph_osdc_start_request(&fsc->client->osdc, req, true); 1222 BUG_ON(rc); 1223 req = NULL; 1224 1225 wbc->nr_to_write -= i; 1226 if (pages) 1227 goto new_request; 1228 1229 /* 1230 * We stop writing back only if we are not doing 1231 * integrity sync. In case of integrity sync we have to 1232 * keep going until we have written all the pages 1233 * we tagged for writeback prior to entering this loop. 1234 */ 1235 if (wbc->nr_to_write <= 0 && wbc->sync_mode == WB_SYNC_NONE) 1236 done = true; 1237 1238 release_pvec_pages: 1239 dout("pagevec_release on %d pages (%p)\n", (int)pvec.nr, 1240 pvec.nr ? pvec.pages[0] : NULL); 1241 pagevec_release(&pvec); 1242 } 1243 1244 if (should_loop && !done) { 1245 /* more to do; loop back to beginning of file */ 1246 dout("writepages looping back to beginning of file\n"); 1247 end = start_index - 1; /* OK even when start_index == 0 */ 1248 1249 /* to write dirty pages associated with next snapc, 1250 * we need to wait until current writes complete */ 1251 if (wbc->sync_mode != WB_SYNC_NONE && 1252 start_index == 0 && /* all dirty pages were checked */ 1253 !ceph_wbc.head_snapc) { 1254 struct page *page; 1255 unsigned i, nr; 1256 index = 0; 1257 while ((index <= end) && 1258 (nr = pagevec_lookup_tag(&pvec, mapping, &index, 1259 PAGECACHE_TAG_WRITEBACK))) { 1260 for (i = 0; i < nr; i++) { 1261 page = pvec.pages[i]; 1262 if (page_snap_context(page) != snapc) 1263 continue; 1264 wait_on_page_writeback(page); 1265 } 1266 pagevec_release(&pvec); 1267 cond_resched(); 1268 } 1269 } 1270 1271 start_index = 0; 1272 index = 0; 1273 goto retry; 1274 } 1275 1276 if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) 1277 mapping->writeback_index = index; 1278 1279 out: 1280 ceph_osdc_put_request(req); 1281 ceph_put_snap_context(last_snapc); 1282 dout("writepages dend - startone, rc = %d\n", rc); 1283 return rc; 1284 } 1285 1286 1287 1288 /* 1289 * See if a given @snapc is either writeable, or already written. 1290 */ 1291 static int context_is_writeable_or_written(struct inode *inode, 1292 struct ceph_snap_context *snapc) 1293 { 1294 struct ceph_snap_context *oldest = get_oldest_context(inode, NULL, NULL); 1295 int ret = !oldest || snapc->seq <= oldest->seq; 1296 1297 ceph_put_snap_context(oldest); 1298 return ret; 1299 } 1300 1301 /** 1302 * ceph_find_incompatible - find an incompatible context and return it 1303 * @page: page being dirtied 1304 * 1305 * We are only allowed to write into/dirty a page if the page is 1306 * clean, or already dirty within the same snap context. Returns a 1307 * conflicting context if there is one, NULL if there isn't, or a 1308 * negative error code on other errors. 1309 * 1310 * Must be called with page lock held. 1311 */ 1312 static struct ceph_snap_context * 1313 ceph_find_incompatible(struct page *page) 1314 { 1315 struct inode *inode = page->mapping->host; 1316 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 1317 struct ceph_inode_info *ci = ceph_inode(inode); 1318 1319 if (READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) { 1320 dout(" page %p forced umount\n", page); 1321 return ERR_PTR(-EIO); 1322 } 1323 1324 for (;;) { 1325 struct ceph_snap_context *snapc, *oldest; 1326 1327 wait_on_page_writeback(page); 1328 1329 snapc = page_snap_context(page); 1330 if (!snapc || snapc == ci->i_head_snapc) 1331 break; 1332 1333 /* 1334 * this page is already dirty in another (older) snap 1335 * context! is it writeable now? 1336 */ 1337 oldest = get_oldest_context(inode, NULL, NULL); 1338 if (snapc->seq > oldest->seq) { 1339 /* not writeable -- return it for the caller to deal with */ 1340 ceph_put_snap_context(oldest); 1341 dout(" page %p snapc %p not current or oldest\n", page, snapc); 1342 return ceph_get_snap_context(snapc); 1343 } 1344 ceph_put_snap_context(oldest); 1345 1346 /* yay, writeable, do it now (without dropping page lock) */ 1347 dout(" page %p snapc %p not current, but oldest\n", page, snapc); 1348 if (clear_page_dirty_for_io(page)) { 1349 int r = writepage_nounlock(page, NULL); 1350 if (r < 0) 1351 return ERR_PTR(r); 1352 } 1353 } 1354 return NULL; 1355 } 1356 1357 /* 1358 * We are only allowed to write into/dirty the page if the page is 1359 * clean, or already dirty within the same snap context. 1360 * 1361 * called with page locked. 1362 * return success with page locked, 1363 * or any failure (incl -EAGAIN) with page unlocked. 1364 */ 1365 static int ceph_update_writeable_page(struct file *file, 1366 loff_t pos, unsigned len, 1367 struct page *page) 1368 { 1369 struct inode *inode = file_inode(file); 1370 struct ceph_inode_info *ci = ceph_inode(inode); 1371 struct ceph_snap_context *snapc; 1372 loff_t page_off = pos & PAGE_MASK; 1373 int pos_in_page = pos & ~PAGE_MASK; 1374 int end_in_page = pos_in_page + len; 1375 loff_t i_size; 1376 int r; 1377 1378 retry_locked: 1379 snapc = ceph_find_incompatible(page); 1380 if (snapc) { 1381 if (IS_ERR(snapc)) { 1382 r = PTR_ERR(snapc); 1383 goto fail_unlock; 1384 } 1385 unlock_page(page); 1386 ceph_queue_writeback(inode); 1387 r = wait_event_killable(ci->i_cap_wq, 1388 context_is_writeable_or_written(inode, snapc)); 1389 ceph_put_snap_context(snapc); 1390 return -EAGAIN; 1391 } 1392 1393 if (PageUptodate(page)) { 1394 dout(" page %p already uptodate\n", page); 1395 return 0; 1396 } 1397 1398 /* full page? */ 1399 if (pos_in_page == 0 && len == PAGE_SIZE) 1400 return 0; 1401 1402 /* past end of file? */ 1403 i_size = i_size_read(inode); 1404 1405 if (page_off >= i_size || 1406 (pos_in_page == 0 && (pos+len) >= i_size && 1407 end_in_page - pos_in_page != PAGE_SIZE)) { 1408 dout(" zeroing %p 0 - %d and %d - %d\n", 1409 page, pos_in_page, end_in_page, (int)PAGE_SIZE); 1410 zero_user_segments(page, 1411 0, pos_in_page, 1412 end_in_page, PAGE_SIZE); 1413 return 0; 1414 } 1415 1416 /* we need to read it. */ 1417 r = ceph_do_readpage(file, page); 1418 if (r < 0) { 1419 if (r == -EINPROGRESS) 1420 return -EAGAIN; 1421 goto fail_unlock; 1422 } 1423 goto retry_locked; 1424 fail_unlock: 1425 unlock_page(page); 1426 return r; 1427 } 1428 1429 /* 1430 * We are only allowed to write into/dirty the page if the page is 1431 * clean, or already dirty within the same snap context. 1432 */ 1433 static int ceph_write_begin(struct file *file, struct address_space *mapping, 1434 loff_t pos, unsigned len, unsigned flags, 1435 struct page **pagep, void **fsdata) 1436 { 1437 struct inode *inode = file_inode(file); 1438 struct page *page; 1439 pgoff_t index = pos >> PAGE_SHIFT; 1440 int r; 1441 1442 do { 1443 /* get a page */ 1444 page = grab_cache_page_write_begin(mapping, index, 0); 1445 if (!page) 1446 return -ENOMEM; 1447 1448 dout("write_begin file %p inode %p page %p %d~%d\n", file, 1449 inode, page, (int)pos, (int)len); 1450 1451 r = ceph_update_writeable_page(file, pos, len, page); 1452 if (r < 0) 1453 put_page(page); 1454 else 1455 *pagep = page; 1456 } while (r == -EAGAIN); 1457 1458 return r; 1459 } 1460 1461 /* 1462 * we don't do anything in here that simple_write_end doesn't do 1463 * except adjust dirty page accounting 1464 */ 1465 static int ceph_write_end(struct file *file, struct address_space *mapping, 1466 loff_t pos, unsigned len, unsigned copied, 1467 struct page *page, void *fsdata) 1468 { 1469 struct inode *inode = file_inode(file); 1470 bool check_cap = false; 1471 1472 dout("write_end file %p inode %p page %p %d~%d (%d)\n", file, 1473 inode, page, (int)pos, (int)copied, (int)len); 1474 1475 /* zero the stale part of the page if we did a short copy */ 1476 if (!PageUptodate(page)) { 1477 if (copied < len) { 1478 copied = 0; 1479 goto out; 1480 } 1481 SetPageUptodate(page); 1482 } 1483 1484 /* did file size increase? */ 1485 if (pos+copied > i_size_read(inode)) 1486 check_cap = ceph_inode_set_size(inode, pos+copied); 1487 1488 set_page_dirty(page); 1489 1490 out: 1491 unlock_page(page); 1492 put_page(page); 1493 1494 if (check_cap) 1495 ceph_check_caps(ceph_inode(inode), CHECK_CAPS_AUTHONLY, NULL); 1496 1497 return copied; 1498 } 1499 1500 /* 1501 * we set .direct_IO to indicate direct io is supported, but since we 1502 * intercept O_DIRECT reads and writes early, this function should 1503 * never get called. 1504 */ 1505 static ssize_t ceph_direct_io(struct kiocb *iocb, struct iov_iter *iter) 1506 { 1507 WARN_ON(1); 1508 return -EINVAL; 1509 } 1510 1511 const struct address_space_operations ceph_aops = { 1512 .readpage = ceph_readpage, 1513 .readpages = ceph_readpages, 1514 .writepage = ceph_writepage, 1515 .writepages = ceph_writepages_start, 1516 .write_begin = ceph_write_begin, 1517 .write_end = ceph_write_end, 1518 .set_page_dirty = ceph_set_page_dirty, 1519 .invalidatepage = ceph_invalidatepage, 1520 .releasepage = ceph_releasepage, 1521 .direct_IO = ceph_direct_io, 1522 }; 1523 1524 static void ceph_block_sigs(sigset_t *oldset) 1525 { 1526 sigset_t mask; 1527 siginitsetinv(&mask, sigmask(SIGKILL)); 1528 sigprocmask(SIG_BLOCK, &mask, oldset); 1529 } 1530 1531 static void ceph_restore_sigs(sigset_t *oldset) 1532 { 1533 sigprocmask(SIG_SETMASK, oldset, NULL); 1534 } 1535 1536 /* 1537 * vm ops 1538 */ 1539 static vm_fault_t ceph_filemap_fault(struct vm_fault *vmf) 1540 { 1541 struct vm_area_struct *vma = vmf->vma; 1542 struct inode *inode = file_inode(vma->vm_file); 1543 struct ceph_inode_info *ci = ceph_inode(inode); 1544 struct ceph_file_info *fi = vma->vm_file->private_data; 1545 struct page *pinned_page = NULL; 1546 loff_t off = vmf->pgoff << PAGE_SHIFT; 1547 int want, got, err; 1548 sigset_t oldset; 1549 vm_fault_t ret = VM_FAULT_SIGBUS; 1550 1551 ceph_block_sigs(&oldset); 1552 1553 dout("filemap_fault %p %llx.%llx %llu~%zd trying to get caps\n", 1554 inode, ceph_vinop(inode), off, (size_t)PAGE_SIZE); 1555 if (fi->fmode & CEPH_FILE_MODE_LAZY) 1556 want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO; 1557 else 1558 want = CEPH_CAP_FILE_CACHE; 1559 1560 got = 0; 1561 err = ceph_get_caps(vma->vm_file, CEPH_CAP_FILE_RD, want, -1, 1562 &got, &pinned_page); 1563 if (err < 0) 1564 goto out_restore; 1565 1566 dout("filemap_fault %p %llu~%zd got cap refs on %s\n", 1567 inode, off, (size_t)PAGE_SIZE, ceph_cap_string(got)); 1568 1569 if ((got & (CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO)) || 1570 ci->i_inline_version == CEPH_INLINE_NONE) { 1571 CEPH_DEFINE_RW_CONTEXT(rw_ctx, got); 1572 ceph_add_rw_context(fi, &rw_ctx); 1573 ret = filemap_fault(vmf); 1574 ceph_del_rw_context(fi, &rw_ctx); 1575 dout("filemap_fault %p %llu~%zd drop cap refs %s ret %x\n", 1576 inode, off, (size_t)PAGE_SIZE, 1577 ceph_cap_string(got), ret); 1578 } else 1579 err = -EAGAIN; 1580 1581 if (pinned_page) 1582 put_page(pinned_page); 1583 ceph_put_cap_refs(ci, got); 1584 1585 if (err != -EAGAIN) 1586 goto out_restore; 1587 1588 /* read inline data */ 1589 if (off >= PAGE_SIZE) { 1590 /* does not support inline data > PAGE_SIZE */ 1591 ret = VM_FAULT_SIGBUS; 1592 } else { 1593 struct address_space *mapping = inode->i_mapping; 1594 struct page *page = find_or_create_page(mapping, 0, 1595 mapping_gfp_constraint(mapping, 1596 ~__GFP_FS)); 1597 if (!page) { 1598 ret = VM_FAULT_OOM; 1599 goto out_inline; 1600 } 1601 err = __ceph_do_getattr(inode, page, 1602 CEPH_STAT_CAP_INLINE_DATA, true); 1603 if (err < 0 || off >= i_size_read(inode)) { 1604 unlock_page(page); 1605 put_page(page); 1606 ret = vmf_error(err); 1607 goto out_inline; 1608 } 1609 if (err < PAGE_SIZE) 1610 zero_user_segment(page, err, PAGE_SIZE); 1611 else 1612 flush_dcache_page(page); 1613 SetPageUptodate(page); 1614 vmf->page = page; 1615 ret = VM_FAULT_MAJOR | VM_FAULT_LOCKED; 1616 out_inline: 1617 dout("filemap_fault %p %llu~%zd read inline data ret %x\n", 1618 inode, off, (size_t)PAGE_SIZE, ret); 1619 } 1620 out_restore: 1621 ceph_restore_sigs(&oldset); 1622 if (err < 0) 1623 ret = vmf_error(err); 1624 1625 return ret; 1626 } 1627 1628 /* 1629 * Reuse write_begin here for simplicity. 1630 */ 1631 static vm_fault_t ceph_page_mkwrite(struct vm_fault *vmf) 1632 { 1633 struct vm_area_struct *vma = vmf->vma; 1634 struct inode *inode = file_inode(vma->vm_file); 1635 struct ceph_inode_info *ci = ceph_inode(inode); 1636 struct ceph_file_info *fi = vma->vm_file->private_data; 1637 struct ceph_cap_flush *prealloc_cf; 1638 struct page *page = vmf->page; 1639 loff_t off = page_offset(page); 1640 loff_t size = i_size_read(inode); 1641 size_t len; 1642 int want, got, err; 1643 sigset_t oldset; 1644 vm_fault_t ret = VM_FAULT_SIGBUS; 1645 1646 prealloc_cf = ceph_alloc_cap_flush(); 1647 if (!prealloc_cf) 1648 return VM_FAULT_OOM; 1649 1650 sb_start_pagefault(inode->i_sb); 1651 ceph_block_sigs(&oldset); 1652 1653 if (ci->i_inline_version != CEPH_INLINE_NONE) { 1654 struct page *locked_page = NULL; 1655 if (off == 0) { 1656 lock_page(page); 1657 locked_page = page; 1658 } 1659 err = ceph_uninline_data(vma->vm_file, locked_page); 1660 if (locked_page) 1661 unlock_page(locked_page); 1662 if (err < 0) 1663 goto out_free; 1664 } 1665 1666 if (off + PAGE_SIZE <= size) 1667 len = PAGE_SIZE; 1668 else 1669 len = size & ~PAGE_MASK; 1670 1671 dout("page_mkwrite %p %llx.%llx %llu~%zd getting caps i_size %llu\n", 1672 inode, ceph_vinop(inode), off, len, size); 1673 if (fi->fmode & CEPH_FILE_MODE_LAZY) 1674 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO; 1675 else 1676 want = CEPH_CAP_FILE_BUFFER; 1677 1678 got = 0; 1679 err = ceph_get_caps(vma->vm_file, CEPH_CAP_FILE_WR, want, off + len, 1680 &got, NULL); 1681 if (err < 0) 1682 goto out_free; 1683 1684 dout("page_mkwrite %p %llu~%zd got cap refs on %s\n", 1685 inode, off, len, ceph_cap_string(got)); 1686 1687 /* Update time before taking page lock */ 1688 file_update_time(vma->vm_file); 1689 inode_inc_iversion_raw(inode); 1690 1691 do { 1692 struct ceph_snap_context *snapc; 1693 1694 lock_page(page); 1695 1696 if (page_mkwrite_check_truncate(page, inode) < 0) { 1697 unlock_page(page); 1698 ret = VM_FAULT_NOPAGE; 1699 break; 1700 } 1701 1702 snapc = ceph_find_incompatible(page); 1703 if (!snapc) { 1704 /* success. we'll keep the page locked. */ 1705 set_page_dirty(page); 1706 ret = VM_FAULT_LOCKED; 1707 break; 1708 } 1709 1710 unlock_page(page); 1711 1712 if (IS_ERR(snapc)) { 1713 ret = VM_FAULT_SIGBUS; 1714 break; 1715 } 1716 1717 ceph_queue_writeback(inode); 1718 err = wait_event_killable(ci->i_cap_wq, 1719 context_is_writeable_or_written(inode, snapc)); 1720 ceph_put_snap_context(snapc); 1721 } while (err == 0); 1722 1723 if (ret == VM_FAULT_LOCKED || 1724 ci->i_inline_version != CEPH_INLINE_NONE) { 1725 int dirty; 1726 spin_lock(&ci->i_ceph_lock); 1727 ci->i_inline_version = CEPH_INLINE_NONE; 1728 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR, 1729 &prealloc_cf); 1730 spin_unlock(&ci->i_ceph_lock); 1731 if (dirty) 1732 __mark_inode_dirty(inode, dirty); 1733 } 1734 1735 dout("page_mkwrite %p %llu~%zd dropping cap refs on %s ret %x\n", 1736 inode, off, len, ceph_cap_string(got), ret); 1737 ceph_put_cap_refs(ci, got); 1738 out_free: 1739 ceph_restore_sigs(&oldset); 1740 sb_end_pagefault(inode->i_sb); 1741 ceph_free_cap_flush(prealloc_cf); 1742 if (err < 0) 1743 ret = vmf_error(err); 1744 return ret; 1745 } 1746 1747 void ceph_fill_inline_data(struct inode *inode, struct page *locked_page, 1748 char *data, size_t len) 1749 { 1750 struct address_space *mapping = inode->i_mapping; 1751 struct page *page; 1752 1753 if (locked_page) { 1754 page = locked_page; 1755 } else { 1756 if (i_size_read(inode) == 0) 1757 return; 1758 page = find_or_create_page(mapping, 0, 1759 mapping_gfp_constraint(mapping, 1760 ~__GFP_FS)); 1761 if (!page) 1762 return; 1763 if (PageUptodate(page)) { 1764 unlock_page(page); 1765 put_page(page); 1766 return; 1767 } 1768 } 1769 1770 dout("fill_inline_data %p %llx.%llx len %zu locked_page %p\n", 1771 inode, ceph_vinop(inode), len, locked_page); 1772 1773 if (len > 0) { 1774 void *kaddr = kmap_atomic(page); 1775 memcpy(kaddr, data, len); 1776 kunmap_atomic(kaddr); 1777 } 1778 1779 if (page != locked_page) { 1780 if (len < PAGE_SIZE) 1781 zero_user_segment(page, len, PAGE_SIZE); 1782 else 1783 flush_dcache_page(page); 1784 1785 SetPageUptodate(page); 1786 unlock_page(page); 1787 put_page(page); 1788 } 1789 } 1790 1791 int ceph_uninline_data(struct file *filp, struct page *locked_page) 1792 { 1793 struct inode *inode = file_inode(filp); 1794 struct ceph_inode_info *ci = ceph_inode(inode); 1795 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 1796 struct ceph_osd_request *req; 1797 struct page *page = NULL; 1798 u64 len, inline_version; 1799 int err = 0; 1800 bool from_pagecache = false; 1801 1802 spin_lock(&ci->i_ceph_lock); 1803 inline_version = ci->i_inline_version; 1804 spin_unlock(&ci->i_ceph_lock); 1805 1806 dout("uninline_data %p %llx.%llx inline_version %llu\n", 1807 inode, ceph_vinop(inode), inline_version); 1808 1809 if (inline_version == 1 || /* initial version, no data */ 1810 inline_version == CEPH_INLINE_NONE) 1811 goto out; 1812 1813 if (locked_page) { 1814 page = locked_page; 1815 WARN_ON(!PageUptodate(page)); 1816 } else if (ceph_caps_issued(ci) & 1817 (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) { 1818 page = find_get_page(inode->i_mapping, 0); 1819 if (page) { 1820 if (PageUptodate(page)) { 1821 from_pagecache = true; 1822 lock_page(page); 1823 } else { 1824 put_page(page); 1825 page = NULL; 1826 } 1827 } 1828 } 1829 1830 if (page) { 1831 len = i_size_read(inode); 1832 if (len > PAGE_SIZE) 1833 len = PAGE_SIZE; 1834 } else { 1835 page = __page_cache_alloc(GFP_NOFS); 1836 if (!page) { 1837 err = -ENOMEM; 1838 goto out; 1839 } 1840 err = __ceph_do_getattr(inode, page, 1841 CEPH_STAT_CAP_INLINE_DATA, true); 1842 if (err < 0) { 1843 /* no inline data */ 1844 if (err == -ENODATA) 1845 err = 0; 1846 goto out; 1847 } 1848 len = err; 1849 } 1850 1851 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, 1852 ceph_vino(inode), 0, &len, 0, 1, 1853 CEPH_OSD_OP_CREATE, CEPH_OSD_FLAG_WRITE, 1854 NULL, 0, 0, false); 1855 if (IS_ERR(req)) { 1856 err = PTR_ERR(req); 1857 goto out; 1858 } 1859 1860 req->r_mtime = inode->i_mtime; 1861 err = ceph_osdc_start_request(&fsc->client->osdc, req, false); 1862 if (!err) 1863 err = ceph_osdc_wait_request(&fsc->client->osdc, req); 1864 ceph_osdc_put_request(req); 1865 if (err < 0) 1866 goto out; 1867 1868 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, 1869 ceph_vino(inode), 0, &len, 1, 3, 1870 CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE, 1871 NULL, ci->i_truncate_seq, 1872 ci->i_truncate_size, false); 1873 if (IS_ERR(req)) { 1874 err = PTR_ERR(req); 1875 goto out; 1876 } 1877 1878 osd_req_op_extent_osd_data_pages(req, 1, &page, len, 0, false, false); 1879 1880 { 1881 __le64 xattr_buf = cpu_to_le64(inline_version); 1882 err = osd_req_op_xattr_init(req, 0, CEPH_OSD_OP_CMPXATTR, 1883 "inline_version", &xattr_buf, 1884 sizeof(xattr_buf), 1885 CEPH_OSD_CMPXATTR_OP_GT, 1886 CEPH_OSD_CMPXATTR_MODE_U64); 1887 if (err) 1888 goto out_put; 1889 } 1890 1891 { 1892 char xattr_buf[32]; 1893 int xattr_len = snprintf(xattr_buf, sizeof(xattr_buf), 1894 "%llu", inline_version); 1895 err = osd_req_op_xattr_init(req, 2, CEPH_OSD_OP_SETXATTR, 1896 "inline_version", 1897 xattr_buf, xattr_len, 0, 0); 1898 if (err) 1899 goto out_put; 1900 } 1901 1902 req->r_mtime = inode->i_mtime; 1903 err = ceph_osdc_start_request(&fsc->client->osdc, req, false); 1904 if (!err) 1905 err = ceph_osdc_wait_request(&fsc->client->osdc, req); 1906 1907 ceph_update_write_latency(&fsc->mdsc->metric, req->r_start_latency, 1908 req->r_end_latency, err); 1909 1910 out_put: 1911 ceph_osdc_put_request(req); 1912 if (err == -ECANCELED) 1913 err = 0; 1914 out: 1915 if (page && page != locked_page) { 1916 if (from_pagecache) { 1917 unlock_page(page); 1918 put_page(page); 1919 } else 1920 __free_pages(page, 0); 1921 } 1922 1923 dout("uninline_data %p %llx.%llx inline_version %llu = %d\n", 1924 inode, ceph_vinop(inode), inline_version, err); 1925 return err; 1926 } 1927 1928 static const struct vm_operations_struct ceph_vmops = { 1929 .fault = ceph_filemap_fault, 1930 .page_mkwrite = ceph_page_mkwrite, 1931 }; 1932 1933 int ceph_mmap(struct file *file, struct vm_area_struct *vma) 1934 { 1935 struct address_space *mapping = file->f_mapping; 1936 1937 if (!mapping->a_ops->readpage) 1938 return -ENOEXEC; 1939 file_accessed(file); 1940 vma->vm_ops = &ceph_vmops; 1941 return 0; 1942 } 1943 1944 enum { 1945 POOL_READ = 1, 1946 POOL_WRITE = 2, 1947 }; 1948 1949 static int __ceph_pool_perm_get(struct ceph_inode_info *ci, 1950 s64 pool, struct ceph_string *pool_ns) 1951 { 1952 struct ceph_fs_client *fsc = ceph_inode_to_client(&ci->vfs_inode); 1953 struct ceph_mds_client *mdsc = fsc->mdsc; 1954 struct ceph_osd_request *rd_req = NULL, *wr_req = NULL; 1955 struct rb_node **p, *parent; 1956 struct ceph_pool_perm *perm; 1957 struct page **pages; 1958 size_t pool_ns_len; 1959 int err = 0, err2 = 0, have = 0; 1960 1961 down_read(&mdsc->pool_perm_rwsem); 1962 p = &mdsc->pool_perm_tree.rb_node; 1963 while (*p) { 1964 perm = rb_entry(*p, struct ceph_pool_perm, node); 1965 if (pool < perm->pool) 1966 p = &(*p)->rb_left; 1967 else if (pool > perm->pool) 1968 p = &(*p)->rb_right; 1969 else { 1970 int ret = ceph_compare_string(pool_ns, 1971 perm->pool_ns, 1972 perm->pool_ns_len); 1973 if (ret < 0) 1974 p = &(*p)->rb_left; 1975 else if (ret > 0) 1976 p = &(*p)->rb_right; 1977 else { 1978 have = perm->perm; 1979 break; 1980 } 1981 } 1982 } 1983 up_read(&mdsc->pool_perm_rwsem); 1984 if (*p) 1985 goto out; 1986 1987 if (pool_ns) 1988 dout("__ceph_pool_perm_get pool %lld ns %.*s no perm cached\n", 1989 pool, (int)pool_ns->len, pool_ns->str); 1990 else 1991 dout("__ceph_pool_perm_get pool %lld no perm cached\n", pool); 1992 1993 down_write(&mdsc->pool_perm_rwsem); 1994 p = &mdsc->pool_perm_tree.rb_node; 1995 parent = NULL; 1996 while (*p) { 1997 parent = *p; 1998 perm = rb_entry(parent, struct ceph_pool_perm, node); 1999 if (pool < perm->pool) 2000 p = &(*p)->rb_left; 2001 else if (pool > perm->pool) 2002 p = &(*p)->rb_right; 2003 else { 2004 int ret = ceph_compare_string(pool_ns, 2005 perm->pool_ns, 2006 perm->pool_ns_len); 2007 if (ret < 0) 2008 p = &(*p)->rb_left; 2009 else if (ret > 0) 2010 p = &(*p)->rb_right; 2011 else { 2012 have = perm->perm; 2013 break; 2014 } 2015 } 2016 } 2017 if (*p) { 2018 up_write(&mdsc->pool_perm_rwsem); 2019 goto out; 2020 } 2021 2022 rd_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL, 2023 1, false, GFP_NOFS); 2024 if (!rd_req) { 2025 err = -ENOMEM; 2026 goto out_unlock; 2027 } 2028 2029 rd_req->r_flags = CEPH_OSD_FLAG_READ; 2030 osd_req_op_init(rd_req, 0, CEPH_OSD_OP_STAT, 0); 2031 rd_req->r_base_oloc.pool = pool; 2032 if (pool_ns) 2033 rd_req->r_base_oloc.pool_ns = ceph_get_string(pool_ns); 2034 ceph_oid_printf(&rd_req->r_base_oid, "%llx.00000000", ci->i_vino.ino); 2035 2036 err = ceph_osdc_alloc_messages(rd_req, GFP_NOFS); 2037 if (err) 2038 goto out_unlock; 2039 2040 wr_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL, 2041 1, false, GFP_NOFS); 2042 if (!wr_req) { 2043 err = -ENOMEM; 2044 goto out_unlock; 2045 } 2046 2047 wr_req->r_flags = CEPH_OSD_FLAG_WRITE; 2048 osd_req_op_init(wr_req, 0, CEPH_OSD_OP_CREATE, CEPH_OSD_OP_FLAG_EXCL); 2049 ceph_oloc_copy(&wr_req->r_base_oloc, &rd_req->r_base_oloc); 2050 ceph_oid_copy(&wr_req->r_base_oid, &rd_req->r_base_oid); 2051 2052 err = ceph_osdc_alloc_messages(wr_req, GFP_NOFS); 2053 if (err) 2054 goto out_unlock; 2055 2056 /* one page should be large enough for STAT data */ 2057 pages = ceph_alloc_page_vector(1, GFP_KERNEL); 2058 if (IS_ERR(pages)) { 2059 err = PTR_ERR(pages); 2060 goto out_unlock; 2061 } 2062 2063 osd_req_op_raw_data_in_pages(rd_req, 0, pages, PAGE_SIZE, 2064 0, false, true); 2065 err = ceph_osdc_start_request(&fsc->client->osdc, rd_req, false); 2066 2067 wr_req->r_mtime = ci->vfs_inode.i_mtime; 2068 err2 = ceph_osdc_start_request(&fsc->client->osdc, wr_req, false); 2069 2070 if (!err) 2071 err = ceph_osdc_wait_request(&fsc->client->osdc, rd_req); 2072 if (!err2) 2073 err2 = ceph_osdc_wait_request(&fsc->client->osdc, wr_req); 2074 2075 if (err >= 0 || err == -ENOENT) 2076 have |= POOL_READ; 2077 else if (err != -EPERM) { 2078 if (err == -EBLOCKLISTED) 2079 fsc->blocklisted = true; 2080 goto out_unlock; 2081 } 2082 2083 if (err2 == 0 || err2 == -EEXIST) 2084 have |= POOL_WRITE; 2085 else if (err2 != -EPERM) { 2086 if (err2 == -EBLOCKLISTED) 2087 fsc->blocklisted = true; 2088 err = err2; 2089 goto out_unlock; 2090 } 2091 2092 pool_ns_len = pool_ns ? pool_ns->len : 0; 2093 perm = kmalloc(sizeof(*perm) + pool_ns_len + 1, GFP_NOFS); 2094 if (!perm) { 2095 err = -ENOMEM; 2096 goto out_unlock; 2097 } 2098 2099 perm->pool = pool; 2100 perm->perm = have; 2101 perm->pool_ns_len = pool_ns_len; 2102 if (pool_ns_len > 0) 2103 memcpy(perm->pool_ns, pool_ns->str, pool_ns_len); 2104 perm->pool_ns[pool_ns_len] = 0; 2105 2106 rb_link_node(&perm->node, parent, p); 2107 rb_insert_color(&perm->node, &mdsc->pool_perm_tree); 2108 err = 0; 2109 out_unlock: 2110 up_write(&mdsc->pool_perm_rwsem); 2111 2112 ceph_osdc_put_request(rd_req); 2113 ceph_osdc_put_request(wr_req); 2114 out: 2115 if (!err) 2116 err = have; 2117 if (pool_ns) 2118 dout("__ceph_pool_perm_get pool %lld ns %.*s result = %d\n", 2119 pool, (int)pool_ns->len, pool_ns->str, err); 2120 else 2121 dout("__ceph_pool_perm_get pool %lld result = %d\n", pool, err); 2122 return err; 2123 } 2124 2125 int ceph_pool_perm_check(struct inode *inode, int need) 2126 { 2127 struct ceph_inode_info *ci = ceph_inode(inode); 2128 struct ceph_string *pool_ns; 2129 s64 pool; 2130 int ret, flags; 2131 2132 if (ci->i_vino.snap != CEPH_NOSNAP) { 2133 /* 2134 * Pool permission check needs to write to the first object. 2135 * But for snapshot, head of the first object may have alread 2136 * been deleted. Skip check to avoid creating orphan object. 2137 */ 2138 return 0; 2139 } 2140 2141 if (ceph_test_mount_opt(ceph_inode_to_client(inode), 2142 NOPOOLPERM)) 2143 return 0; 2144 2145 spin_lock(&ci->i_ceph_lock); 2146 flags = ci->i_ceph_flags; 2147 pool = ci->i_layout.pool_id; 2148 spin_unlock(&ci->i_ceph_lock); 2149 check: 2150 if (flags & CEPH_I_POOL_PERM) { 2151 if ((need & CEPH_CAP_FILE_RD) && !(flags & CEPH_I_POOL_RD)) { 2152 dout("ceph_pool_perm_check pool %lld no read perm\n", 2153 pool); 2154 return -EPERM; 2155 } 2156 if ((need & CEPH_CAP_FILE_WR) && !(flags & CEPH_I_POOL_WR)) { 2157 dout("ceph_pool_perm_check pool %lld no write perm\n", 2158 pool); 2159 return -EPERM; 2160 } 2161 return 0; 2162 } 2163 2164 pool_ns = ceph_try_get_string(ci->i_layout.pool_ns); 2165 ret = __ceph_pool_perm_get(ci, pool, pool_ns); 2166 ceph_put_string(pool_ns); 2167 if (ret < 0) 2168 return ret; 2169 2170 flags = CEPH_I_POOL_PERM; 2171 if (ret & POOL_READ) 2172 flags |= CEPH_I_POOL_RD; 2173 if (ret & POOL_WRITE) 2174 flags |= CEPH_I_POOL_WR; 2175 2176 spin_lock(&ci->i_ceph_lock); 2177 if (pool == ci->i_layout.pool_id && 2178 pool_ns == rcu_dereference_raw(ci->i_layout.pool_ns)) { 2179 ci->i_ceph_flags |= flags; 2180 } else { 2181 pool = ci->i_layout.pool_id; 2182 flags = ci->i_ceph_flags; 2183 } 2184 spin_unlock(&ci->i_ceph_lock); 2185 goto check; 2186 } 2187 2188 void ceph_pool_perm_destroy(struct ceph_mds_client *mdsc) 2189 { 2190 struct ceph_pool_perm *perm; 2191 struct rb_node *n; 2192 2193 while (!RB_EMPTY_ROOT(&mdsc->pool_perm_tree)) { 2194 n = rb_first(&mdsc->pool_perm_tree); 2195 perm = rb_entry(n, struct ceph_pool_perm, node); 2196 rb_erase(n, &mdsc->pool_perm_tree); 2197 kfree(perm); 2198 } 2199 } 2200