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 14 #include "super.h" 15 #include "mds_client.h" 16 #include "cache.h" 17 #include <linux/ceph/osd_client.h> 18 #include <linux/ceph/striper.h> 19 20 /* 21 * Ceph address space ops. 22 * 23 * There are a few funny things going on here. 24 * 25 * The page->private field is used to reference a struct 26 * ceph_snap_context for _every_ dirty page. This indicates which 27 * snapshot the page was logically dirtied in, and thus which snap 28 * context needs to be associated with the osd write during writeback. 29 * 30 * Similarly, struct ceph_inode_info maintains a set of counters to 31 * count dirty pages on the inode. In the absence of snapshots, 32 * i_wrbuffer_ref == i_wrbuffer_ref_head == the dirty page count. 33 * 34 * When a snapshot is taken (that is, when the client receives 35 * notification that a snapshot was taken), each inode with caps and 36 * with dirty pages (dirty pages implies there is a cap) gets a new 37 * ceph_cap_snap in the i_cap_snaps list (which is sorted in ascending 38 * order, new snaps go to the tail). The i_wrbuffer_ref_head count is 39 * moved to capsnap->dirty. (Unless a sync write is currently in 40 * progress. In that case, the capsnap is said to be "pending", new 41 * writes cannot start, and the capsnap isn't "finalized" until the 42 * write completes (or fails) and a final size/mtime for the inode for 43 * that snap can be settled upon.) i_wrbuffer_ref_head is reset to 0. 44 * 45 * On writeback, we must submit writes to the osd IN SNAP ORDER. So, 46 * we look for the first capsnap in i_cap_snaps and write out pages in 47 * that snap context _only_. Then we move on to the next capsnap, 48 * eventually reaching the "live" or "head" context (i.e., pages that 49 * are not yet snapped) and are writing the most recently dirtied 50 * pages. 51 * 52 * Invalidate and so forth must take care to ensure the dirty page 53 * accounting is preserved. 54 */ 55 56 #define CONGESTION_ON_THRESH(congestion_kb) (congestion_kb >> (PAGE_SHIFT-10)) 57 #define CONGESTION_OFF_THRESH(congestion_kb) \ 58 (CONGESTION_ON_THRESH(congestion_kb) - \ 59 (CONGESTION_ON_THRESH(congestion_kb) >> 2)) 60 61 static inline struct ceph_snap_context *page_snap_context(struct page *page) 62 { 63 if (PagePrivate(page)) 64 return (void *)page->private; 65 return NULL; 66 } 67 68 /* 69 * Dirty a page. Optimistically adjust accounting, on the assumption 70 * that we won't race with invalidate. If we do, readjust. 71 */ 72 static int ceph_set_page_dirty(struct page *page) 73 { 74 struct address_space *mapping = page->mapping; 75 struct inode *inode; 76 struct ceph_inode_info *ci; 77 struct ceph_snap_context *snapc; 78 int ret; 79 80 if (unlikely(!mapping)) 81 return !TestSetPageDirty(page); 82 83 if (PageDirty(page)) { 84 dout("%p set_page_dirty %p idx %lu -- already dirty\n", 85 mapping->host, page, page->index); 86 BUG_ON(!PagePrivate(page)); 87 return 0; 88 } 89 90 inode = mapping->host; 91 ci = ceph_inode(inode); 92 93 /* dirty the head */ 94 spin_lock(&ci->i_ceph_lock); 95 BUG_ON(ci->i_wr_ref == 0); // caller should hold Fw reference 96 if (__ceph_have_pending_cap_snap(ci)) { 97 struct ceph_cap_snap *capsnap = 98 list_last_entry(&ci->i_cap_snaps, 99 struct ceph_cap_snap, 100 ci_item); 101 snapc = ceph_get_snap_context(capsnap->context); 102 capsnap->dirty_pages++; 103 } else { 104 BUG_ON(!ci->i_head_snapc); 105 snapc = ceph_get_snap_context(ci->i_head_snapc); 106 ++ci->i_wrbuffer_ref_head; 107 } 108 if (ci->i_wrbuffer_ref == 0) 109 ihold(inode); 110 ++ci->i_wrbuffer_ref; 111 dout("%p set_page_dirty %p idx %lu head %d/%d -> %d/%d " 112 "snapc %p seq %lld (%d snaps)\n", 113 mapping->host, page, page->index, 114 ci->i_wrbuffer_ref-1, ci->i_wrbuffer_ref_head-1, 115 ci->i_wrbuffer_ref, ci->i_wrbuffer_ref_head, 116 snapc, snapc->seq, snapc->num_snaps); 117 spin_unlock(&ci->i_ceph_lock); 118 119 /* 120 * Reference snap context in page->private. Also set 121 * PagePrivate so that we get invalidatepage callback. 122 */ 123 BUG_ON(PagePrivate(page)); 124 page->private = (unsigned long)snapc; 125 SetPagePrivate(page); 126 127 ret = __set_page_dirty_nobuffers(page); 128 WARN_ON(!PageLocked(page)); 129 WARN_ON(!page->mapping); 130 131 return ret; 132 } 133 134 /* 135 * If we are truncating the full page (i.e. offset == 0), adjust the 136 * dirty page counters appropriately. Only called if there is private 137 * data on the page. 138 */ 139 static void ceph_invalidatepage(struct page *page, unsigned int offset, 140 unsigned int length) 141 { 142 struct inode *inode; 143 struct ceph_inode_info *ci; 144 struct ceph_snap_context *snapc = page_snap_context(page); 145 146 inode = page->mapping->host; 147 ci = ceph_inode(inode); 148 149 if (offset != 0 || length != PAGE_SIZE) { 150 dout("%p invalidatepage %p idx %lu partial dirty page %u~%u\n", 151 inode, page, page->index, offset, length); 152 return; 153 } 154 155 ceph_invalidate_fscache_page(inode, page); 156 157 WARN_ON(!PageLocked(page)); 158 if (!PagePrivate(page)) 159 return; 160 161 ClearPageChecked(page); 162 163 dout("%p invalidatepage %p idx %lu full dirty page\n", 164 inode, page, page->index); 165 166 ceph_put_wrbuffer_cap_refs(ci, 1, snapc); 167 ceph_put_snap_context(snapc); 168 page->private = 0; 169 ClearPagePrivate(page); 170 } 171 172 static int ceph_releasepage(struct page *page, gfp_t g) 173 { 174 dout("%p releasepage %p idx %lu (%sdirty)\n", page->mapping->host, 175 page, page->index, PageDirty(page) ? "" : "not "); 176 177 /* Can we release the page from the cache? */ 178 if (!ceph_release_fscache_page(page, g)) 179 return 0; 180 181 return !PagePrivate(page); 182 } 183 184 /* 185 * read a single page, without unlocking it. 186 */ 187 static int ceph_do_readpage(struct file *filp, struct page *page) 188 { 189 struct inode *inode = file_inode(filp); 190 struct ceph_inode_info *ci = ceph_inode(inode); 191 struct ceph_osd_client *osdc = 192 &ceph_inode_to_client(inode)->client->osdc; 193 int err = 0; 194 u64 off = page_offset(page); 195 u64 len = PAGE_SIZE; 196 197 if (off >= i_size_read(inode)) { 198 zero_user_segment(page, 0, PAGE_SIZE); 199 SetPageUptodate(page); 200 return 0; 201 } 202 203 if (ci->i_inline_version != CEPH_INLINE_NONE) { 204 /* 205 * Uptodate inline data should have been added 206 * into page cache while getting Fcr caps. 207 */ 208 if (off == 0) 209 return -EINVAL; 210 zero_user_segment(page, 0, PAGE_SIZE); 211 SetPageUptodate(page); 212 return 0; 213 } 214 215 err = ceph_readpage_from_fscache(inode, page); 216 if (err == 0) 217 return -EINPROGRESS; 218 219 dout("readpage inode %p file %p page %p index %lu\n", 220 inode, filp, page, page->index); 221 err = ceph_osdc_readpages(osdc, ceph_vino(inode), &ci->i_layout, 222 off, &len, 223 ci->i_truncate_seq, ci->i_truncate_size, 224 &page, 1, 0); 225 if (err == -ENOENT) 226 err = 0; 227 if (err < 0) { 228 SetPageError(page); 229 ceph_fscache_readpage_cancel(inode, page); 230 goto out; 231 } 232 if (err < PAGE_SIZE) 233 /* zero fill remainder of page */ 234 zero_user_segment(page, err, PAGE_SIZE); 235 else 236 flush_dcache_page(page); 237 238 SetPageUptodate(page); 239 ceph_readpage_to_fscache(inode, page); 240 241 out: 242 return err < 0 ? err : 0; 243 } 244 245 static int ceph_readpage(struct file *filp, struct page *page) 246 { 247 int r = ceph_do_readpage(filp, page); 248 if (r != -EINPROGRESS) 249 unlock_page(page); 250 else 251 r = 0; 252 return r; 253 } 254 255 /* 256 * Finish an async read(ahead) op. 257 */ 258 static void finish_read(struct ceph_osd_request *req) 259 { 260 struct inode *inode = req->r_inode; 261 struct ceph_osd_data *osd_data; 262 int rc = req->r_result <= 0 ? req->r_result : 0; 263 int bytes = req->r_result >= 0 ? req->r_result : 0; 264 int num_pages; 265 int i; 266 267 dout("finish_read %p req %p rc %d bytes %d\n", inode, req, rc, bytes); 268 269 /* unlock all pages, zeroing any data we didn't read */ 270 osd_data = osd_req_op_extent_osd_data(req, 0); 271 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES); 272 num_pages = calc_pages_for((u64)osd_data->alignment, 273 (u64)osd_data->length); 274 for (i = 0; i < num_pages; i++) { 275 struct page *page = osd_data->pages[i]; 276 277 if (rc < 0 && rc != -ENOENT) { 278 ceph_fscache_readpage_cancel(inode, page); 279 goto unlock; 280 } 281 if (bytes < (int)PAGE_SIZE) { 282 /* zero (remainder of) page */ 283 int s = bytes < 0 ? 0 : bytes; 284 zero_user_segment(page, s, PAGE_SIZE); 285 } 286 dout("finish_read %p uptodate %p idx %lu\n", inode, page, 287 page->index); 288 flush_dcache_page(page); 289 SetPageUptodate(page); 290 ceph_readpage_to_fscache(inode, page); 291 unlock: 292 unlock_page(page); 293 put_page(page); 294 bytes -= PAGE_SIZE; 295 } 296 kfree(osd_data->pages); 297 } 298 299 /* 300 * start an async read(ahead) operation. return nr_pages we submitted 301 * a read for on success, or negative error code. 302 */ 303 static int start_read(struct inode *inode, struct ceph_rw_context *rw_ctx, 304 struct list_head *page_list, int max) 305 { 306 struct ceph_osd_client *osdc = 307 &ceph_inode_to_client(inode)->client->osdc; 308 struct ceph_inode_info *ci = ceph_inode(inode); 309 struct page *page = list_entry(page_list->prev, struct page, lru); 310 struct ceph_vino vino; 311 struct ceph_osd_request *req; 312 u64 off; 313 u64 len; 314 int i; 315 struct page **pages; 316 pgoff_t next_index; 317 int nr_pages = 0; 318 int got = 0; 319 int ret = 0; 320 321 if (!rw_ctx) { 322 /* caller of readpages does not hold buffer and read caps 323 * (fadvise, madvise and readahead cases) */ 324 int want = CEPH_CAP_FILE_CACHE; 325 ret = ceph_try_get_caps(ci, CEPH_CAP_FILE_RD, want, &got); 326 if (ret < 0) { 327 dout("start_read %p, error getting cap\n", inode); 328 } else if (!(got & want)) { 329 dout("start_read %p, no cache cap\n", inode); 330 ret = 0; 331 } 332 if (ret <= 0) { 333 if (got) 334 ceph_put_cap_refs(ci, got); 335 while (!list_empty(page_list)) { 336 page = list_entry(page_list->prev, 337 struct page, lru); 338 list_del(&page->lru); 339 put_page(page); 340 } 341 return ret; 342 } 343 } 344 345 off = (u64) page_offset(page); 346 347 /* count pages */ 348 next_index = page->index; 349 list_for_each_entry_reverse(page, page_list, lru) { 350 if (page->index != next_index) 351 break; 352 nr_pages++; 353 next_index++; 354 if (max && nr_pages == max) 355 break; 356 } 357 len = nr_pages << PAGE_SHIFT; 358 dout("start_read %p nr_pages %d is %lld~%lld\n", inode, nr_pages, 359 off, len); 360 vino = ceph_vino(inode); 361 req = ceph_osdc_new_request(osdc, &ci->i_layout, vino, off, &len, 362 0, 1, CEPH_OSD_OP_READ, 363 CEPH_OSD_FLAG_READ, NULL, 364 ci->i_truncate_seq, ci->i_truncate_size, 365 false); 366 if (IS_ERR(req)) { 367 ret = PTR_ERR(req); 368 goto out; 369 } 370 371 /* build page vector */ 372 nr_pages = calc_pages_for(0, len); 373 pages = kmalloc_array(nr_pages, sizeof(*pages), GFP_KERNEL); 374 if (!pages) { 375 ret = -ENOMEM; 376 goto out_put; 377 } 378 for (i = 0; i < nr_pages; ++i) { 379 page = list_entry(page_list->prev, struct page, lru); 380 BUG_ON(PageLocked(page)); 381 list_del(&page->lru); 382 383 dout("start_read %p adding %p idx %lu\n", inode, page, 384 page->index); 385 if (add_to_page_cache_lru(page, &inode->i_data, page->index, 386 GFP_KERNEL)) { 387 ceph_fscache_uncache_page(inode, page); 388 put_page(page); 389 dout("start_read %p add_to_page_cache failed %p\n", 390 inode, page); 391 nr_pages = i; 392 if (nr_pages > 0) { 393 len = nr_pages << PAGE_SHIFT; 394 osd_req_op_extent_update(req, 0, len); 395 break; 396 } 397 goto out_pages; 398 } 399 pages[i] = page; 400 } 401 osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0, false, false); 402 req->r_callback = finish_read; 403 req->r_inode = inode; 404 405 dout("start_read %p starting %p %lld~%lld\n", inode, req, off, len); 406 ret = ceph_osdc_start_request(osdc, req, false); 407 if (ret < 0) 408 goto out_pages; 409 ceph_osdc_put_request(req); 410 411 /* After adding locked pages to page cache, the inode holds cache cap. 412 * So we can drop our cap refs. */ 413 if (got) 414 ceph_put_cap_refs(ci, got); 415 416 return nr_pages; 417 418 out_pages: 419 for (i = 0; i < nr_pages; ++i) { 420 ceph_fscache_readpage_cancel(inode, pages[i]); 421 unlock_page(pages[i]); 422 } 423 ceph_put_page_vector(pages, nr_pages, false); 424 out_put: 425 ceph_osdc_put_request(req); 426 out: 427 if (got) 428 ceph_put_cap_refs(ci, got); 429 return ret; 430 } 431 432 433 /* 434 * Read multiple pages. Leave pages we don't read + unlock in page_list; 435 * the caller (VM) cleans them up. 436 */ 437 static int ceph_readpages(struct file *file, struct address_space *mapping, 438 struct list_head *page_list, unsigned nr_pages) 439 { 440 struct inode *inode = file_inode(file); 441 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 442 struct ceph_file_info *fi = file->private_data; 443 struct ceph_rw_context *rw_ctx; 444 int rc = 0; 445 int max = 0; 446 447 if (ceph_inode(inode)->i_inline_version != CEPH_INLINE_NONE) 448 return -EINVAL; 449 450 rc = ceph_readpages_from_fscache(mapping->host, mapping, page_list, 451 &nr_pages); 452 453 if (rc == 0) 454 goto out; 455 456 rw_ctx = ceph_find_rw_context(fi); 457 max = fsc->mount_options->rsize >> PAGE_SHIFT; 458 dout("readpages %p file %p ctx %p nr_pages %d max %d\n", 459 inode, file, rw_ctx, nr_pages, max); 460 while (!list_empty(page_list)) { 461 rc = start_read(inode, rw_ctx, page_list, max); 462 if (rc < 0) 463 goto out; 464 } 465 out: 466 ceph_fscache_readpages_cancel(inode, page_list); 467 468 dout("readpages %p file %p ret %d\n", inode, file, rc); 469 return rc; 470 } 471 472 struct ceph_writeback_ctl 473 { 474 loff_t i_size; 475 u64 truncate_size; 476 u32 truncate_seq; 477 bool size_stable; 478 bool head_snapc; 479 }; 480 481 /* 482 * Get ref for the oldest snapc for an inode with dirty data... that is, the 483 * only snap context we are allowed to write back. 484 */ 485 static struct ceph_snap_context * 486 get_oldest_context(struct inode *inode, struct ceph_writeback_ctl *ctl, 487 struct ceph_snap_context *page_snapc) 488 { 489 struct ceph_inode_info *ci = ceph_inode(inode); 490 struct ceph_snap_context *snapc = NULL; 491 struct ceph_cap_snap *capsnap = NULL; 492 493 spin_lock(&ci->i_ceph_lock); 494 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) { 495 dout(" cap_snap %p snapc %p has %d dirty pages\n", capsnap, 496 capsnap->context, capsnap->dirty_pages); 497 if (!capsnap->dirty_pages) 498 continue; 499 500 /* get i_size, truncate_{seq,size} for page_snapc? */ 501 if (snapc && capsnap->context != page_snapc) 502 continue; 503 504 if (ctl) { 505 if (capsnap->writing) { 506 ctl->i_size = i_size_read(inode); 507 ctl->size_stable = false; 508 } else { 509 ctl->i_size = capsnap->size; 510 ctl->size_stable = true; 511 } 512 ctl->truncate_size = capsnap->truncate_size; 513 ctl->truncate_seq = capsnap->truncate_seq; 514 ctl->head_snapc = false; 515 } 516 517 if (snapc) 518 break; 519 520 snapc = ceph_get_snap_context(capsnap->context); 521 if (!page_snapc || 522 page_snapc == snapc || 523 page_snapc->seq > snapc->seq) 524 break; 525 } 526 if (!snapc && ci->i_wrbuffer_ref_head) { 527 snapc = ceph_get_snap_context(ci->i_head_snapc); 528 dout(" head snapc %p has %d dirty pages\n", 529 snapc, ci->i_wrbuffer_ref_head); 530 if (ctl) { 531 ctl->i_size = i_size_read(inode); 532 ctl->truncate_size = ci->i_truncate_size; 533 ctl->truncate_seq = ci->i_truncate_seq; 534 ctl->size_stable = false; 535 ctl->head_snapc = true; 536 } 537 } 538 spin_unlock(&ci->i_ceph_lock); 539 return snapc; 540 } 541 542 static u64 get_writepages_data_length(struct inode *inode, 543 struct page *page, u64 start) 544 { 545 struct ceph_inode_info *ci = ceph_inode(inode); 546 struct ceph_snap_context *snapc = page_snap_context(page); 547 struct ceph_cap_snap *capsnap = NULL; 548 u64 end = i_size_read(inode); 549 550 if (snapc != ci->i_head_snapc) { 551 bool found = false; 552 spin_lock(&ci->i_ceph_lock); 553 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) { 554 if (capsnap->context == snapc) { 555 if (!capsnap->writing) 556 end = capsnap->size; 557 found = true; 558 break; 559 } 560 } 561 spin_unlock(&ci->i_ceph_lock); 562 WARN_ON(!found); 563 } 564 if (end > page_offset(page) + PAGE_SIZE) 565 end = page_offset(page) + PAGE_SIZE; 566 return end > start ? end - start : 0; 567 } 568 569 /* 570 * Write a single page, but leave the page locked. 571 * 572 * If we get a write error, set the page error bit, but still adjust the 573 * dirty page accounting (i.e., page is no longer dirty). 574 */ 575 static int writepage_nounlock(struct page *page, struct writeback_control *wbc) 576 { 577 struct timespec ts; 578 struct inode *inode; 579 struct ceph_inode_info *ci; 580 struct ceph_fs_client *fsc; 581 struct ceph_snap_context *snapc, *oldest; 582 loff_t page_off = page_offset(page); 583 int err, len = PAGE_SIZE; 584 struct ceph_writeback_ctl ceph_wbc; 585 586 dout("writepage %p idx %lu\n", page, page->index); 587 588 inode = page->mapping->host; 589 ci = ceph_inode(inode); 590 fsc = ceph_inode_to_client(inode); 591 592 /* verify this is a writeable snap context */ 593 snapc = page_snap_context(page); 594 if (!snapc) { 595 dout("writepage %p page %p not dirty?\n", inode, page); 596 return 0; 597 } 598 oldest = get_oldest_context(inode, &ceph_wbc, snapc); 599 if (snapc->seq > oldest->seq) { 600 dout("writepage %p page %p snapc %p not writeable - noop\n", 601 inode, page, snapc); 602 /* we should only noop if called by kswapd */ 603 WARN_ON(!(current->flags & PF_MEMALLOC)); 604 ceph_put_snap_context(oldest); 605 redirty_page_for_writepage(wbc, page); 606 return 0; 607 } 608 ceph_put_snap_context(oldest); 609 610 /* is this a partial page at end of file? */ 611 if (page_off >= ceph_wbc.i_size) { 612 dout("%p page eof %llu\n", page, ceph_wbc.i_size); 613 page->mapping->a_ops->invalidatepage(page, 0, PAGE_SIZE); 614 return 0; 615 } 616 617 if (ceph_wbc.i_size < page_off + len) 618 len = ceph_wbc.i_size - page_off; 619 620 dout("writepage %p page %p index %lu on %llu~%u snapc %p seq %lld\n", 621 inode, page, page->index, page_off, len, snapc, snapc->seq); 622 623 if (atomic_long_inc_return(&fsc->writeback_count) > 624 CONGESTION_ON_THRESH(fsc->mount_options->congestion_kb)) 625 set_bdi_congested(inode_to_bdi(inode), BLK_RW_ASYNC); 626 627 set_page_writeback(page); 628 ts = timespec64_to_timespec(inode->i_mtime); 629 err = ceph_osdc_writepages(&fsc->client->osdc, ceph_vino(inode), 630 &ci->i_layout, snapc, page_off, len, 631 ceph_wbc.truncate_seq, 632 ceph_wbc.truncate_size, 633 &ts, &page, 1); 634 if (err < 0) { 635 struct writeback_control tmp_wbc; 636 if (!wbc) 637 wbc = &tmp_wbc; 638 if (err == -ERESTARTSYS) { 639 /* killed by SIGKILL */ 640 dout("writepage interrupted page %p\n", page); 641 redirty_page_for_writepage(wbc, page); 642 end_page_writeback(page); 643 return err; 644 } 645 dout("writepage setting page/mapping error %d %p\n", 646 err, page); 647 SetPageError(page); 648 mapping_set_error(&inode->i_data, err); 649 wbc->pages_skipped++; 650 } else { 651 dout("writepage cleaned page %p\n", page); 652 err = 0; /* vfs expects us to return 0 */ 653 } 654 page->private = 0; 655 ClearPagePrivate(page); 656 end_page_writeback(page); 657 ceph_put_wrbuffer_cap_refs(ci, 1, snapc); 658 ceph_put_snap_context(snapc); /* page's reference */ 659 660 if (atomic_long_dec_return(&fsc->writeback_count) < 661 CONGESTION_OFF_THRESH(fsc->mount_options->congestion_kb)) 662 clear_bdi_congested(inode_to_bdi(inode), BLK_RW_ASYNC); 663 664 return err; 665 } 666 667 static int ceph_writepage(struct page *page, struct writeback_control *wbc) 668 { 669 int err; 670 struct inode *inode = page->mapping->host; 671 BUG_ON(!inode); 672 ihold(inode); 673 err = writepage_nounlock(page, wbc); 674 if (err == -ERESTARTSYS) { 675 /* direct memory reclaimer was killed by SIGKILL. return 0 676 * to prevent caller from setting mapping/page error */ 677 err = 0; 678 } 679 unlock_page(page); 680 iput(inode); 681 return err; 682 } 683 684 /* 685 * lame release_pages helper. release_pages() isn't exported to 686 * modules. 687 */ 688 static void ceph_release_pages(struct page **pages, int num) 689 { 690 struct pagevec pvec; 691 int i; 692 693 pagevec_init(&pvec); 694 for (i = 0; i < num; i++) { 695 if (pagevec_add(&pvec, pages[i]) == 0) 696 pagevec_release(&pvec); 697 } 698 pagevec_release(&pvec); 699 } 700 701 /* 702 * async writeback completion handler. 703 * 704 * If we get an error, set the mapping error bit, but not the individual 705 * page error bits. 706 */ 707 static void writepages_finish(struct ceph_osd_request *req) 708 { 709 struct inode *inode = req->r_inode; 710 struct ceph_inode_info *ci = ceph_inode(inode); 711 struct ceph_osd_data *osd_data; 712 struct page *page; 713 int num_pages, total_pages = 0; 714 int i, j; 715 int rc = req->r_result; 716 struct ceph_snap_context *snapc = req->r_snapc; 717 struct address_space *mapping = inode->i_mapping; 718 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 719 bool remove_page; 720 721 dout("writepages_finish %p rc %d\n", inode, rc); 722 if (rc < 0) { 723 mapping_set_error(mapping, rc); 724 ceph_set_error_write(ci); 725 } else { 726 ceph_clear_error_write(ci); 727 } 728 729 /* 730 * We lost the cache cap, need to truncate the page before 731 * it is unlocked, otherwise we'd truncate it later in the 732 * page truncation thread, possibly losing some data that 733 * raced its way in 734 */ 735 remove_page = !(ceph_caps_issued(ci) & 736 (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)); 737 738 /* clean all pages */ 739 for (i = 0; i < req->r_num_ops; i++) { 740 if (req->r_ops[i].op != CEPH_OSD_OP_WRITE) 741 break; 742 743 osd_data = osd_req_op_extent_osd_data(req, i); 744 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES); 745 num_pages = calc_pages_for((u64)osd_data->alignment, 746 (u64)osd_data->length); 747 total_pages += num_pages; 748 for (j = 0; j < num_pages; j++) { 749 page = osd_data->pages[j]; 750 BUG_ON(!page); 751 WARN_ON(!PageUptodate(page)); 752 753 if (atomic_long_dec_return(&fsc->writeback_count) < 754 CONGESTION_OFF_THRESH( 755 fsc->mount_options->congestion_kb)) 756 clear_bdi_congested(inode_to_bdi(inode), 757 BLK_RW_ASYNC); 758 759 ceph_put_snap_context(page_snap_context(page)); 760 page->private = 0; 761 ClearPagePrivate(page); 762 dout("unlocking %p\n", page); 763 end_page_writeback(page); 764 765 if (remove_page) 766 generic_error_remove_page(inode->i_mapping, 767 page); 768 769 unlock_page(page); 770 } 771 dout("writepages_finish %p wrote %llu bytes cleaned %d pages\n", 772 inode, osd_data->length, rc >= 0 ? num_pages : 0); 773 774 ceph_release_pages(osd_data->pages, num_pages); 775 } 776 777 ceph_put_wrbuffer_cap_refs(ci, total_pages, snapc); 778 779 osd_data = osd_req_op_extent_osd_data(req, 0); 780 if (osd_data->pages_from_pool) 781 mempool_free(osd_data->pages, 782 ceph_sb_to_client(inode->i_sb)->wb_pagevec_pool); 783 else 784 kfree(osd_data->pages); 785 ceph_osdc_put_request(req); 786 } 787 788 /* 789 * initiate async writeback 790 */ 791 static int ceph_writepages_start(struct address_space *mapping, 792 struct writeback_control *wbc) 793 { 794 struct inode *inode = mapping->host; 795 struct ceph_inode_info *ci = ceph_inode(inode); 796 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 797 struct ceph_vino vino = ceph_vino(inode); 798 pgoff_t index, start_index, end = -1; 799 struct ceph_snap_context *snapc = NULL, *last_snapc = NULL, *pgsnapc; 800 struct pagevec pvec; 801 int rc = 0; 802 unsigned int wsize = i_blocksize(inode); 803 struct ceph_osd_request *req = NULL; 804 struct ceph_writeback_ctl ceph_wbc; 805 bool should_loop, range_whole = false; 806 bool done = false; 807 808 dout("writepages_start %p (mode=%s)\n", inode, 809 wbc->sync_mode == WB_SYNC_NONE ? "NONE" : 810 (wbc->sync_mode == WB_SYNC_ALL ? "ALL" : "HOLD")); 811 812 if (READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) { 813 if (ci->i_wrbuffer_ref > 0) { 814 pr_warn_ratelimited( 815 "writepage_start %p %lld forced umount\n", 816 inode, ceph_ino(inode)); 817 } 818 mapping_set_error(mapping, -EIO); 819 return -EIO; /* we're in a forced umount, don't write! */ 820 } 821 if (fsc->mount_options->wsize < wsize) 822 wsize = fsc->mount_options->wsize; 823 824 pagevec_init(&pvec); 825 826 start_index = wbc->range_cyclic ? mapping->writeback_index : 0; 827 index = start_index; 828 829 retry: 830 /* find oldest snap context with dirty data */ 831 snapc = get_oldest_context(inode, &ceph_wbc, NULL); 832 if (!snapc) { 833 /* hmm, why does writepages get called when there 834 is no dirty data? */ 835 dout(" no snap context with dirty data?\n"); 836 goto out; 837 } 838 dout(" oldest snapc is %p seq %lld (%d snaps)\n", 839 snapc, snapc->seq, snapc->num_snaps); 840 841 should_loop = false; 842 if (ceph_wbc.head_snapc && snapc != last_snapc) { 843 /* where to start/end? */ 844 if (wbc->range_cyclic) { 845 index = start_index; 846 end = -1; 847 if (index > 0) 848 should_loop = true; 849 dout(" cyclic, start at %lu\n", index); 850 } else { 851 index = wbc->range_start >> PAGE_SHIFT; 852 end = wbc->range_end >> PAGE_SHIFT; 853 if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) 854 range_whole = true; 855 dout(" not cyclic, %lu to %lu\n", index, end); 856 } 857 } else if (!ceph_wbc.head_snapc) { 858 /* Do not respect wbc->range_{start,end}. Dirty pages 859 * in that range can be associated with newer snapc. 860 * They are not writeable until we write all dirty pages 861 * associated with 'snapc' get written */ 862 if (index > 0) 863 should_loop = true; 864 dout(" non-head snapc, range whole\n"); 865 } 866 867 ceph_put_snap_context(last_snapc); 868 last_snapc = snapc; 869 870 while (!done && index <= end) { 871 int num_ops = 0, op_idx; 872 unsigned i, pvec_pages, max_pages, locked_pages = 0; 873 struct page **pages = NULL, **data_pages; 874 mempool_t *pool = NULL; /* Becomes non-null if mempool used */ 875 struct page *page; 876 pgoff_t strip_unit_end = 0; 877 u64 offset = 0, len = 0; 878 879 max_pages = wsize >> PAGE_SHIFT; 880 881 get_more_pages: 882 pvec_pages = pagevec_lookup_range_nr_tag(&pvec, mapping, &index, 883 end, PAGECACHE_TAG_DIRTY, 884 max_pages - locked_pages); 885 dout("pagevec_lookup_range_tag got %d\n", pvec_pages); 886 if (!pvec_pages && !locked_pages) 887 break; 888 for (i = 0; i < pvec_pages && locked_pages < max_pages; i++) { 889 page = pvec.pages[i]; 890 dout("? %p idx %lu\n", page, page->index); 891 if (locked_pages == 0) 892 lock_page(page); /* first page */ 893 else if (!trylock_page(page)) 894 break; 895 896 /* only dirty pages, or our accounting breaks */ 897 if (unlikely(!PageDirty(page)) || 898 unlikely(page->mapping != mapping)) { 899 dout("!dirty or !mapping %p\n", page); 900 unlock_page(page); 901 continue; 902 } 903 /* only if matching snap context */ 904 pgsnapc = page_snap_context(page); 905 if (pgsnapc != snapc) { 906 dout("page snapc %p %lld != oldest %p %lld\n", 907 pgsnapc, pgsnapc->seq, snapc, snapc->seq); 908 if (!should_loop && 909 !ceph_wbc.head_snapc && 910 wbc->sync_mode != WB_SYNC_NONE) 911 should_loop = true; 912 unlock_page(page); 913 continue; 914 } 915 if (page_offset(page) >= ceph_wbc.i_size) { 916 dout("%p page eof %llu\n", 917 page, ceph_wbc.i_size); 918 if (ceph_wbc.size_stable || 919 page_offset(page) >= i_size_read(inode)) 920 mapping->a_ops->invalidatepage(page, 921 0, PAGE_SIZE); 922 unlock_page(page); 923 continue; 924 } 925 if (strip_unit_end && (page->index > strip_unit_end)) { 926 dout("end of strip unit %p\n", page); 927 unlock_page(page); 928 break; 929 } 930 if (PageWriteback(page)) { 931 if (wbc->sync_mode == WB_SYNC_NONE) { 932 dout("%p under writeback\n", page); 933 unlock_page(page); 934 continue; 935 } 936 dout("waiting on writeback %p\n", page); 937 wait_on_page_writeback(page); 938 } 939 940 if (!clear_page_dirty_for_io(page)) { 941 dout("%p !clear_page_dirty_for_io\n", page); 942 unlock_page(page); 943 continue; 944 } 945 946 /* 947 * We have something to write. If this is 948 * the first locked page this time through, 949 * calculate max possinle write size and 950 * allocate a page array 951 */ 952 if (locked_pages == 0) { 953 u64 objnum; 954 u64 objoff; 955 u32 xlen; 956 957 /* prepare async write request */ 958 offset = (u64)page_offset(page); 959 ceph_calc_file_object_mapping(&ci->i_layout, 960 offset, wsize, 961 &objnum, &objoff, 962 &xlen); 963 len = xlen; 964 965 num_ops = 1; 966 strip_unit_end = page->index + 967 ((len - 1) >> PAGE_SHIFT); 968 969 BUG_ON(pages); 970 max_pages = calc_pages_for(0, (u64)len); 971 pages = kmalloc_array(max_pages, 972 sizeof(*pages), 973 GFP_NOFS); 974 if (!pages) { 975 pool = fsc->wb_pagevec_pool; 976 pages = mempool_alloc(pool, GFP_NOFS); 977 BUG_ON(!pages); 978 } 979 980 len = 0; 981 } else if (page->index != 982 (offset + len) >> PAGE_SHIFT) { 983 if (num_ops >= (pool ? CEPH_OSD_SLAB_OPS : 984 CEPH_OSD_MAX_OPS)) { 985 redirty_page_for_writepage(wbc, page); 986 unlock_page(page); 987 break; 988 } 989 990 num_ops++; 991 offset = (u64)page_offset(page); 992 len = 0; 993 } 994 995 /* note position of first page in pvec */ 996 dout("%p will write page %p idx %lu\n", 997 inode, page, page->index); 998 999 if (atomic_long_inc_return(&fsc->writeback_count) > 1000 CONGESTION_ON_THRESH( 1001 fsc->mount_options->congestion_kb)) { 1002 set_bdi_congested(inode_to_bdi(inode), 1003 BLK_RW_ASYNC); 1004 } 1005 1006 1007 pages[locked_pages++] = page; 1008 pvec.pages[i] = NULL; 1009 1010 len += PAGE_SIZE; 1011 } 1012 1013 /* did we get anything? */ 1014 if (!locked_pages) 1015 goto release_pvec_pages; 1016 if (i) { 1017 unsigned j, n = 0; 1018 /* shift unused page to beginning of pvec */ 1019 for (j = 0; j < pvec_pages; j++) { 1020 if (!pvec.pages[j]) 1021 continue; 1022 if (n < j) 1023 pvec.pages[n] = pvec.pages[j]; 1024 n++; 1025 } 1026 pvec.nr = n; 1027 1028 if (pvec_pages && i == pvec_pages && 1029 locked_pages < max_pages) { 1030 dout("reached end pvec, trying for more\n"); 1031 pagevec_release(&pvec); 1032 goto get_more_pages; 1033 } 1034 } 1035 1036 new_request: 1037 offset = page_offset(pages[0]); 1038 len = wsize; 1039 1040 req = ceph_osdc_new_request(&fsc->client->osdc, 1041 &ci->i_layout, vino, 1042 offset, &len, 0, num_ops, 1043 CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE, 1044 snapc, ceph_wbc.truncate_seq, 1045 ceph_wbc.truncate_size, false); 1046 if (IS_ERR(req)) { 1047 req = ceph_osdc_new_request(&fsc->client->osdc, 1048 &ci->i_layout, vino, 1049 offset, &len, 0, 1050 min(num_ops, 1051 CEPH_OSD_SLAB_OPS), 1052 CEPH_OSD_OP_WRITE, 1053 CEPH_OSD_FLAG_WRITE, 1054 snapc, ceph_wbc.truncate_seq, 1055 ceph_wbc.truncate_size, true); 1056 BUG_ON(IS_ERR(req)); 1057 } 1058 BUG_ON(len < page_offset(pages[locked_pages - 1]) + 1059 PAGE_SIZE - offset); 1060 1061 req->r_callback = writepages_finish; 1062 req->r_inode = inode; 1063 1064 /* Format the osd request message and submit the write */ 1065 len = 0; 1066 data_pages = pages; 1067 op_idx = 0; 1068 for (i = 0; i < locked_pages; i++) { 1069 u64 cur_offset = page_offset(pages[i]); 1070 if (offset + len != cur_offset) { 1071 if (op_idx + 1 == req->r_num_ops) 1072 break; 1073 osd_req_op_extent_dup_last(req, op_idx, 1074 cur_offset - offset); 1075 dout("writepages got pages at %llu~%llu\n", 1076 offset, len); 1077 osd_req_op_extent_osd_data_pages(req, op_idx, 1078 data_pages, len, 0, 1079 !!pool, false); 1080 osd_req_op_extent_update(req, op_idx, len); 1081 1082 len = 0; 1083 offset = cur_offset; 1084 data_pages = pages + i; 1085 op_idx++; 1086 } 1087 1088 set_page_writeback(pages[i]); 1089 len += PAGE_SIZE; 1090 } 1091 1092 if (ceph_wbc.size_stable) { 1093 len = min(len, ceph_wbc.i_size - offset); 1094 } else if (i == locked_pages) { 1095 /* writepages_finish() clears writeback pages 1096 * according to the data length, so make sure 1097 * data length covers all locked pages */ 1098 u64 min_len = len + 1 - PAGE_SIZE; 1099 len = get_writepages_data_length(inode, pages[i - 1], 1100 offset); 1101 len = max(len, min_len); 1102 } 1103 dout("writepages got pages at %llu~%llu\n", offset, len); 1104 1105 osd_req_op_extent_osd_data_pages(req, op_idx, data_pages, len, 1106 0, !!pool, false); 1107 osd_req_op_extent_update(req, op_idx, len); 1108 1109 BUG_ON(op_idx + 1 != req->r_num_ops); 1110 1111 pool = NULL; 1112 if (i < locked_pages) { 1113 BUG_ON(num_ops <= req->r_num_ops); 1114 num_ops -= req->r_num_ops; 1115 locked_pages -= i; 1116 1117 /* allocate new pages array for next request */ 1118 data_pages = pages; 1119 pages = kmalloc_array(locked_pages, sizeof(*pages), 1120 GFP_NOFS); 1121 if (!pages) { 1122 pool = fsc->wb_pagevec_pool; 1123 pages = mempool_alloc(pool, GFP_NOFS); 1124 BUG_ON(!pages); 1125 } 1126 memcpy(pages, data_pages + i, 1127 locked_pages * sizeof(*pages)); 1128 memset(data_pages + i, 0, 1129 locked_pages * sizeof(*pages)); 1130 } else { 1131 BUG_ON(num_ops != req->r_num_ops); 1132 index = pages[i - 1]->index + 1; 1133 /* request message now owns the pages array */ 1134 pages = NULL; 1135 } 1136 1137 req->r_mtime = timespec64_to_timespec(inode->i_mtime); 1138 rc = ceph_osdc_start_request(&fsc->client->osdc, req, true); 1139 BUG_ON(rc); 1140 req = NULL; 1141 1142 wbc->nr_to_write -= i; 1143 if (pages) 1144 goto new_request; 1145 1146 /* 1147 * We stop writing back only if we are not doing 1148 * integrity sync. In case of integrity sync we have to 1149 * keep going until we have written all the pages 1150 * we tagged for writeback prior to entering this loop. 1151 */ 1152 if (wbc->nr_to_write <= 0 && wbc->sync_mode == WB_SYNC_NONE) 1153 done = true; 1154 1155 release_pvec_pages: 1156 dout("pagevec_release on %d pages (%p)\n", (int)pvec.nr, 1157 pvec.nr ? pvec.pages[0] : NULL); 1158 pagevec_release(&pvec); 1159 } 1160 1161 if (should_loop && !done) { 1162 /* more to do; loop back to beginning of file */ 1163 dout("writepages looping back to beginning of file\n"); 1164 end = start_index - 1; /* OK even when start_index == 0 */ 1165 1166 /* to write dirty pages associated with next snapc, 1167 * we need to wait until current writes complete */ 1168 if (wbc->sync_mode != WB_SYNC_NONE && 1169 start_index == 0 && /* all dirty pages were checked */ 1170 !ceph_wbc.head_snapc) { 1171 struct page *page; 1172 unsigned i, nr; 1173 index = 0; 1174 while ((index <= end) && 1175 (nr = pagevec_lookup_tag(&pvec, mapping, &index, 1176 PAGECACHE_TAG_WRITEBACK))) { 1177 for (i = 0; i < nr; i++) { 1178 page = pvec.pages[i]; 1179 if (page_snap_context(page) != snapc) 1180 continue; 1181 wait_on_page_writeback(page); 1182 } 1183 pagevec_release(&pvec); 1184 cond_resched(); 1185 } 1186 } 1187 1188 start_index = 0; 1189 index = 0; 1190 goto retry; 1191 } 1192 1193 if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) 1194 mapping->writeback_index = index; 1195 1196 out: 1197 ceph_osdc_put_request(req); 1198 ceph_put_snap_context(last_snapc); 1199 dout("writepages dend - startone, rc = %d\n", rc); 1200 return rc; 1201 } 1202 1203 1204 1205 /* 1206 * See if a given @snapc is either writeable, or already written. 1207 */ 1208 static int context_is_writeable_or_written(struct inode *inode, 1209 struct ceph_snap_context *snapc) 1210 { 1211 struct ceph_snap_context *oldest = get_oldest_context(inode, NULL, NULL); 1212 int ret = !oldest || snapc->seq <= oldest->seq; 1213 1214 ceph_put_snap_context(oldest); 1215 return ret; 1216 } 1217 1218 /* 1219 * We are only allowed to write into/dirty the page if the page is 1220 * clean, or already dirty within the same snap context. 1221 * 1222 * called with page locked. 1223 * return success with page locked, 1224 * or any failure (incl -EAGAIN) with page unlocked. 1225 */ 1226 static int ceph_update_writeable_page(struct file *file, 1227 loff_t pos, unsigned len, 1228 struct page *page) 1229 { 1230 struct inode *inode = file_inode(file); 1231 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 1232 struct ceph_inode_info *ci = ceph_inode(inode); 1233 loff_t page_off = pos & PAGE_MASK; 1234 int pos_in_page = pos & ~PAGE_MASK; 1235 int end_in_page = pos_in_page + len; 1236 loff_t i_size; 1237 int r; 1238 struct ceph_snap_context *snapc, *oldest; 1239 1240 if (READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) { 1241 dout(" page %p forced umount\n", page); 1242 unlock_page(page); 1243 return -EIO; 1244 } 1245 1246 retry_locked: 1247 /* writepages currently holds page lock, but if we change that later, */ 1248 wait_on_page_writeback(page); 1249 1250 snapc = page_snap_context(page); 1251 if (snapc && snapc != ci->i_head_snapc) { 1252 /* 1253 * this page is already dirty in another (older) snap 1254 * context! is it writeable now? 1255 */ 1256 oldest = get_oldest_context(inode, NULL, NULL); 1257 if (snapc->seq > oldest->seq) { 1258 ceph_put_snap_context(oldest); 1259 dout(" page %p snapc %p not current or oldest\n", 1260 page, snapc); 1261 /* 1262 * queue for writeback, and wait for snapc to 1263 * be writeable or written 1264 */ 1265 snapc = ceph_get_snap_context(snapc); 1266 unlock_page(page); 1267 ceph_queue_writeback(inode); 1268 r = wait_event_killable(ci->i_cap_wq, 1269 context_is_writeable_or_written(inode, snapc)); 1270 ceph_put_snap_context(snapc); 1271 if (r == -ERESTARTSYS) 1272 return r; 1273 return -EAGAIN; 1274 } 1275 ceph_put_snap_context(oldest); 1276 1277 /* yay, writeable, do it now (without dropping page lock) */ 1278 dout(" page %p snapc %p not current, but oldest\n", 1279 page, snapc); 1280 if (!clear_page_dirty_for_io(page)) 1281 goto retry_locked; 1282 r = writepage_nounlock(page, NULL); 1283 if (r < 0) 1284 goto fail_unlock; 1285 goto retry_locked; 1286 } 1287 1288 if (PageUptodate(page)) { 1289 dout(" page %p already uptodate\n", page); 1290 return 0; 1291 } 1292 1293 /* full page? */ 1294 if (pos_in_page == 0 && len == PAGE_SIZE) 1295 return 0; 1296 1297 /* past end of file? */ 1298 i_size = i_size_read(inode); 1299 1300 if (page_off >= i_size || 1301 (pos_in_page == 0 && (pos+len) >= i_size && 1302 end_in_page - pos_in_page != PAGE_SIZE)) { 1303 dout(" zeroing %p 0 - %d and %d - %d\n", 1304 page, pos_in_page, end_in_page, (int)PAGE_SIZE); 1305 zero_user_segments(page, 1306 0, pos_in_page, 1307 end_in_page, PAGE_SIZE); 1308 return 0; 1309 } 1310 1311 /* we need to read it. */ 1312 r = ceph_do_readpage(file, page); 1313 if (r < 0) { 1314 if (r == -EINPROGRESS) 1315 return -EAGAIN; 1316 goto fail_unlock; 1317 } 1318 goto retry_locked; 1319 fail_unlock: 1320 unlock_page(page); 1321 return r; 1322 } 1323 1324 /* 1325 * We are only allowed to write into/dirty the page if the page is 1326 * clean, or already dirty within the same snap context. 1327 */ 1328 static int ceph_write_begin(struct file *file, struct address_space *mapping, 1329 loff_t pos, unsigned len, unsigned flags, 1330 struct page **pagep, void **fsdata) 1331 { 1332 struct inode *inode = file_inode(file); 1333 struct page *page; 1334 pgoff_t index = pos >> PAGE_SHIFT; 1335 int r; 1336 1337 do { 1338 /* get a page */ 1339 page = grab_cache_page_write_begin(mapping, index, 0); 1340 if (!page) 1341 return -ENOMEM; 1342 1343 dout("write_begin file %p inode %p page %p %d~%d\n", file, 1344 inode, page, (int)pos, (int)len); 1345 1346 r = ceph_update_writeable_page(file, pos, len, page); 1347 if (r < 0) 1348 put_page(page); 1349 else 1350 *pagep = page; 1351 } while (r == -EAGAIN); 1352 1353 return r; 1354 } 1355 1356 /* 1357 * we don't do anything in here that simple_write_end doesn't do 1358 * except adjust dirty page accounting 1359 */ 1360 static int ceph_write_end(struct file *file, struct address_space *mapping, 1361 loff_t pos, unsigned len, unsigned copied, 1362 struct page *page, void *fsdata) 1363 { 1364 struct inode *inode = file_inode(file); 1365 bool check_cap = false; 1366 1367 dout("write_end file %p inode %p page %p %d~%d (%d)\n", file, 1368 inode, page, (int)pos, (int)copied, (int)len); 1369 1370 /* zero the stale part of the page if we did a short copy */ 1371 if (!PageUptodate(page)) { 1372 if (copied < len) { 1373 copied = 0; 1374 goto out; 1375 } 1376 SetPageUptodate(page); 1377 } 1378 1379 /* did file size increase? */ 1380 if (pos+copied > i_size_read(inode)) 1381 check_cap = ceph_inode_set_size(inode, pos+copied); 1382 1383 set_page_dirty(page); 1384 1385 out: 1386 unlock_page(page); 1387 put_page(page); 1388 1389 if (check_cap) 1390 ceph_check_caps(ceph_inode(inode), CHECK_CAPS_AUTHONLY, NULL); 1391 1392 return copied; 1393 } 1394 1395 /* 1396 * we set .direct_IO to indicate direct io is supported, but since we 1397 * intercept O_DIRECT reads and writes early, this function should 1398 * never get called. 1399 */ 1400 static ssize_t ceph_direct_io(struct kiocb *iocb, struct iov_iter *iter) 1401 { 1402 WARN_ON(1); 1403 return -EINVAL; 1404 } 1405 1406 const struct address_space_operations ceph_aops = { 1407 .readpage = ceph_readpage, 1408 .readpages = ceph_readpages, 1409 .writepage = ceph_writepage, 1410 .writepages = ceph_writepages_start, 1411 .write_begin = ceph_write_begin, 1412 .write_end = ceph_write_end, 1413 .set_page_dirty = ceph_set_page_dirty, 1414 .invalidatepage = ceph_invalidatepage, 1415 .releasepage = ceph_releasepage, 1416 .direct_IO = ceph_direct_io, 1417 }; 1418 1419 static void ceph_block_sigs(sigset_t *oldset) 1420 { 1421 sigset_t mask; 1422 siginitsetinv(&mask, sigmask(SIGKILL)); 1423 sigprocmask(SIG_BLOCK, &mask, oldset); 1424 } 1425 1426 static void ceph_restore_sigs(sigset_t *oldset) 1427 { 1428 sigprocmask(SIG_SETMASK, oldset, NULL); 1429 } 1430 1431 /* 1432 * vm ops 1433 */ 1434 static int ceph_filemap_fault(struct vm_fault *vmf) 1435 { 1436 struct vm_area_struct *vma = vmf->vma; 1437 struct inode *inode = file_inode(vma->vm_file); 1438 struct ceph_inode_info *ci = ceph_inode(inode); 1439 struct ceph_file_info *fi = vma->vm_file->private_data; 1440 struct page *pinned_page = NULL; 1441 loff_t off = vmf->pgoff << PAGE_SHIFT; 1442 int want, got, ret; 1443 sigset_t oldset; 1444 1445 ceph_block_sigs(&oldset); 1446 1447 dout("filemap_fault %p %llx.%llx %llu~%zd trying to get caps\n", 1448 inode, ceph_vinop(inode), off, (size_t)PAGE_SIZE); 1449 if (fi->fmode & CEPH_FILE_MODE_LAZY) 1450 want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO; 1451 else 1452 want = CEPH_CAP_FILE_CACHE; 1453 1454 got = 0; 1455 ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, -1, &got, &pinned_page); 1456 if (ret < 0) 1457 goto out_restore; 1458 1459 dout("filemap_fault %p %llu~%zd got cap refs on %s\n", 1460 inode, off, (size_t)PAGE_SIZE, ceph_cap_string(got)); 1461 1462 if ((got & (CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO)) || 1463 ci->i_inline_version == CEPH_INLINE_NONE) { 1464 CEPH_DEFINE_RW_CONTEXT(rw_ctx, got); 1465 ceph_add_rw_context(fi, &rw_ctx); 1466 ret = filemap_fault(vmf); 1467 ceph_del_rw_context(fi, &rw_ctx); 1468 } else 1469 ret = -EAGAIN; 1470 1471 dout("filemap_fault %p %llu~%zd dropping cap refs on %s ret %d\n", 1472 inode, off, (size_t)PAGE_SIZE, ceph_cap_string(got), ret); 1473 if (pinned_page) 1474 put_page(pinned_page); 1475 ceph_put_cap_refs(ci, got); 1476 1477 if (ret != -EAGAIN) 1478 goto out_restore; 1479 1480 /* read inline data */ 1481 if (off >= PAGE_SIZE) { 1482 /* does not support inline data > PAGE_SIZE */ 1483 ret = VM_FAULT_SIGBUS; 1484 } else { 1485 int ret1; 1486 struct address_space *mapping = inode->i_mapping; 1487 struct page *page = find_or_create_page(mapping, 0, 1488 mapping_gfp_constraint(mapping, 1489 ~__GFP_FS)); 1490 if (!page) { 1491 ret = VM_FAULT_OOM; 1492 goto out_inline; 1493 } 1494 ret1 = __ceph_do_getattr(inode, page, 1495 CEPH_STAT_CAP_INLINE_DATA, true); 1496 if (ret1 < 0 || off >= i_size_read(inode)) { 1497 unlock_page(page); 1498 put_page(page); 1499 if (ret1 < 0) 1500 ret = ret1; 1501 else 1502 ret = VM_FAULT_SIGBUS; 1503 goto out_inline; 1504 } 1505 if (ret1 < PAGE_SIZE) 1506 zero_user_segment(page, ret1, PAGE_SIZE); 1507 else 1508 flush_dcache_page(page); 1509 SetPageUptodate(page); 1510 vmf->page = page; 1511 ret = VM_FAULT_MAJOR | VM_FAULT_LOCKED; 1512 out_inline: 1513 dout("filemap_fault %p %llu~%zd read inline data ret %d\n", 1514 inode, off, (size_t)PAGE_SIZE, ret); 1515 } 1516 out_restore: 1517 ceph_restore_sigs(&oldset); 1518 if (ret < 0) 1519 ret = (ret == -ENOMEM) ? VM_FAULT_OOM : VM_FAULT_SIGBUS; 1520 1521 return ret; 1522 } 1523 1524 /* 1525 * Reuse write_begin here for simplicity. 1526 */ 1527 static int ceph_page_mkwrite(struct vm_fault *vmf) 1528 { 1529 struct vm_area_struct *vma = vmf->vma; 1530 struct inode *inode = file_inode(vma->vm_file); 1531 struct ceph_inode_info *ci = ceph_inode(inode); 1532 struct ceph_file_info *fi = vma->vm_file->private_data; 1533 struct ceph_cap_flush *prealloc_cf; 1534 struct page *page = vmf->page; 1535 loff_t off = page_offset(page); 1536 loff_t size = i_size_read(inode); 1537 size_t len; 1538 int want, got, ret; 1539 sigset_t oldset; 1540 1541 prealloc_cf = ceph_alloc_cap_flush(); 1542 if (!prealloc_cf) 1543 return VM_FAULT_OOM; 1544 1545 ceph_block_sigs(&oldset); 1546 1547 if (ci->i_inline_version != CEPH_INLINE_NONE) { 1548 struct page *locked_page = NULL; 1549 if (off == 0) { 1550 lock_page(page); 1551 locked_page = page; 1552 } 1553 ret = ceph_uninline_data(vma->vm_file, locked_page); 1554 if (locked_page) 1555 unlock_page(locked_page); 1556 if (ret < 0) 1557 goto out_free; 1558 } 1559 1560 if (off + PAGE_SIZE <= size) 1561 len = PAGE_SIZE; 1562 else 1563 len = size & ~PAGE_MASK; 1564 1565 dout("page_mkwrite %p %llx.%llx %llu~%zd getting caps i_size %llu\n", 1566 inode, ceph_vinop(inode), off, len, size); 1567 if (fi->fmode & CEPH_FILE_MODE_LAZY) 1568 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO; 1569 else 1570 want = CEPH_CAP_FILE_BUFFER; 1571 1572 got = 0; 1573 ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, off + len, 1574 &got, NULL); 1575 if (ret < 0) 1576 goto out_free; 1577 1578 dout("page_mkwrite %p %llu~%zd got cap refs on %s\n", 1579 inode, off, len, ceph_cap_string(got)); 1580 1581 /* Update time before taking page lock */ 1582 file_update_time(vma->vm_file); 1583 1584 do { 1585 lock_page(page); 1586 1587 if ((off > size) || (page->mapping != inode->i_mapping)) { 1588 unlock_page(page); 1589 ret = VM_FAULT_NOPAGE; 1590 break; 1591 } 1592 1593 ret = ceph_update_writeable_page(vma->vm_file, off, len, page); 1594 if (ret >= 0) { 1595 /* success. we'll keep the page locked. */ 1596 set_page_dirty(page); 1597 ret = VM_FAULT_LOCKED; 1598 } 1599 } while (ret == -EAGAIN); 1600 1601 if (ret == VM_FAULT_LOCKED || 1602 ci->i_inline_version != CEPH_INLINE_NONE) { 1603 int dirty; 1604 spin_lock(&ci->i_ceph_lock); 1605 ci->i_inline_version = CEPH_INLINE_NONE; 1606 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR, 1607 &prealloc_cf); 1608 spin_unlock(&ci->i_ceph_lock); 1609 if (dirty) 1610 __mark_inode_dirty(inode, dirty); 1611 } 1612 1613 dout("page_mkwrite %p %llu~%zd dropping cap refs on %s ret %d\n", 1614 inode, off, len, ceph_cap_string(got), ret); 1615 ceph_put_cap_refs(ci, got); 1616 out_free: 1617 ceph_restore_sigs(&oldset); 1618 ceph_free_cap_flush(prealloc_cf); 1619 if (ret < 0) 1620 ret = (ret == -ENOMEM) ? VM_FAULT_OOM : VM_FAULT_SIGBUS; 1621 return ret; 1622 } 1623 1624 void ceph_fill_inline_data(struct inode *inode, struct page *locked_page, 1625 char *data, size_t len) 1626 { 1627 struct address_space *mapping = inode->i_mapping; 1628 struct page *page; 1629 1630 if (locked_page) { 1631 page = locked_page; 1632 } else { 1633 if (i_size_read(inode) == 0) 1634 return; 1635 page = find_or_create_page(mapping, 0, 1636 mapping_gfp_constraint(mapping, 1637 ~__GFP_FS)); 1638 if (!page) 1639 return; 1640 if (PageUptodate(page)) { 1641 unlock_page(page); 1642 put_page(page); 1643 return; 1644 } 1645 } 1646 1647 dout("fill_inline_data %p %llx.%llx len %zu locked_page %p\n", 1648 inode, ceph_vinop(inode), len, locked_page); 1649 1650 if (len > 0) { 1651 void *kaddr = kmap_atomic(page); 1652 memcpy(kaddr, data, len); 1653 kunmap_atomic(kaddr); 1654 } 1655 1656 if (page != locked_page) { 1657 if (len < PAGE_SIZE) 1658 zero_user_segment(page, len, PAGE_SIZE); 1659 else 1660 flush_dcache_page(page); 1661 1662 SetPageUptodate(page); 1663 unlock_page(page); 1664 put_page(page); 1665 } 1666 } 1667 1668 int ceph_uninline_data(struct file *filp, struct page *locked_page) 1669 { 1670 struct inode *inode = file_inode(filp); 1671 struct ceph_inode_info *ci = ceph_inode(inode); 1672 struct ceph_fs_client *fsc = ceph_inode_to_client(inode); 1673 struct ceph_osd_request *req; 1674 struct page *page = NULL; 1675 u64 len, inline_version; 1676 int err = 0; 1677 bool from_pagecache = false; 1678 1679 spin_lock(&ci->i_ceph_lock); 1680 inline_version = ci->i_inline_version; 1681 spin_unlock(&ci->i_ceph_lock); 1682 1683 dout("uninline_data %p %llx.%llx inline_version %llu\n", 1684 inode, ceph_vinop(inode), inline_version); 1685 1686 if (inline_version == 1 || /* initial version, no data */ 1687 inline_version == CEPH_INLINE_NONE) 1688 goto out; 1689 1690 if (locked_page) { 1691 page = locked_page; 1692 WARN_ON(!PageUptodate(page)); 1693 } else if (ceph_caps_issued(ci) & 1694 (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) { 1695 page = find_get_page(inode->i_mapping, 0); 1696 if (page) { 1697 if (PageUptodate(page)) { 1698 from_pagecache = true; 1699 lock_page(page); 1700 } else { 1701 put_page(page); 1702 page = NULL; 1703 } 1704 } 1705 } 1706 1707 if (page) { 1708 len = i_size_read(inode); 1709 if (len > PAGE_SIZE) 1710 len = PAGE_SIZE; 1711 } else { 1712 page = __page_cache_alloc(GFP_NOFS); 1713 if (!page) { 1714 err = -ENOMEM; 1715 goto out; 1716 } 1717 err = __ceph_do_getattr(inode, page, 1718 CEPH_STAT_CAP_INLINE_DATA, true); 1719 if (err < 0) { 1720 /* no inline data */ 1721 if (err == -ENODATA) 1722 err = 0; 1723 goto out; 1724 } 1725 len = err; 1726 } 1727 1728 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, 1729 ceph_vino(inode), 0, &len, 0, 1, 1730 CEPH_OSD_OP_CREATE, CEPH_OSD_FLAG_WRITE, 1731 NULL, 0, 0, false); 1732 if (IS_ERR(req)) { 1733 err = PTR_ERR(req); 1734 goto out; 1735 } 1736 1737 req->r_mtime = timespec64_to_timespec(inode->i_mtime); 1738 err = ceph_osdc_start_request(&fsc->client->osdc, req, false); 1739 if (!err) 1740 err = ceph_osdc_wait_request(&fsc->client->osdc, req); 1741 ceph_osdc_put_request(req); 1742 if (err < 0) 1743 goto out; 1744 1745 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, 1746 ceph_vino(inode), 0, &len, 1, 3, 1747 CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE, 1748 NULL, ci->i_truncate_seq, 1749 ci->i_truncate_size, false); 1750 if (IS_ERR(req)) { 1751 err = PTR_ERR(req); 1752 goto out; 1753 } 1754 1755 osd_req_op_extent_osd_data_pages(req, 1, &page, len, 0, false, false); 1756 1757 { 1758 __le64 xattr_buf = cpu_to_le64(inline_version); 1759 err = osd_req_op_xattr_init(req, 0, CEPH_OSD_OP_CMPXATTR, 1760 "inline_version", &xattr_buf, 1761 sizeof(xattr_buf), 1762 CEPH_OSD_CMPXATTR_OP_GT, 1763 CEPH_OSD_CMPXATTR_MODE_U64); 1764 if (err) 1765 goto out_put; 1766 } 1767 1768 { 1769 char xattr_buf[32]; 1770 int xattr_len = snprintf(xattr_buf, sizeof(xattr_buf), 1771 "%llu", inline_version); 1772 err = osd_req_op_xattr_init(req, 2, CEPH_OSD_OP_SETXATTR, 1773 "inline_version", 1774 xattr_buf, xattr_len, 0, 0); 1775 if (err) 1776 goto out_put; 1777 } 1778 1779 req->r_mtime = timespec64_to_timespec(inode->i_mtime); 1780 err = ceph_osdc_start_request(&fsc->client->osdc, req, false); 1781 if (!err) 1782 err = ceph_osdc_wait_request(&fsc->client->osdc, req); 1783 out_put: 1784 ceph_osdc_put_request(req); 1785 if (err == -ECANCELED) 1786 err = 0; 1787 out: 1788 if (page && page != locked_page) { 1789 if (from_pagecache) { 1790 unlock_page(page); 1791 put_page(page); 1792 } else 1793 __free_pages(page, 0); 1794 } 1795 1796 dout("uninline_data %p %llx.%llx inline_version %llu = %d\n", 1797 inode, ceph_vinop(inode), inline_version, err); 1798 return err; 1799 } 1800 1801 static const struct vm_operations_struct ceph_vmops = { 1802 .fault = ceph_filemap_fault, 1803 .page_mkwrite = ceph_page_mkwrite, 1804 }; 1805 1806 int ceph_mmap(struct file *file, struct vm_area_struct *vma) 1807 { 1808 struct address_space *mapping = file->f_mapping; 1809 1810 if (!mapping->a_ops->readpage) 1811 return -ENOEXEC; 1812 file_accessed(file); 1813 vma->vm_ops = &ceph_vmops; 1814 return 0; 1815 } 1816 1817 enum { 1818 POOL_READ = 1, 1819 POOL_WRITE = 2, 1820 }; 1821 1822 static int __ceph_pool_perm_get(struct ceph_inode_info *ci, 1823 s64 pool, struct ceph_string *pool_ns) 1824 { 1825 struct ceph_fs_client *fsc = ceph_inode_to_client(&ci->vfs_inode); 1826 struct ceph_mds_client *mdsc = fsc->mdsc; 1827 struct ceph_osd_request *rd_req = NULL, *wr_req = NULL; 1828 struct rb_node **p, *parent; 1829 struct ceph_pool_perm *perm; 1830 struct page **pages; 1831 size_t pool_ns_len; 1832 int err = 0, err2 = 0, have = 0; 1833 1834 down_read(&mdsc->pool_perm_rwsem); 1835 p = &mdsc->pool_perm_tree.rb_node; 1836 while (*p) { 1837 perm = rb_entry(*p, struct ceph_pool_perm, node); 1838 if (pool < perm->pool) 1839 p = &(*p)->rb_left; 1840 else if (pool > perm->pool) 1841 p = &(*p)->rb_right; 1842 else { 1843 int ret = ceph_compare_string(pool_ns, 1844 perm->pool_ns, 1845 perm->pool_ns_len); 1846 if (ret < 0) 1847 p = &(*p)->rb_left; 1848 else if (ret > 0) 1849 p = &(*p)->rb_right; 1850 else { 1851 have = perm->perm; 1852 break; 1853 } 1854 } 1855 } 1856 up_read(&mdsc->pool_perm_rwsem); 1857 if (*p) 1858 goto out; 1859 1860 if (pool_ns) 1861 dout("__ceph_pool_perm_get pool %lld ns %.*s no perm cached\n", 1862 pool, (int)pool_ns->len, pool_ns->str); 1863 else 1864 dout("__ceph_pool_perm_get pool %lld no perm cached\n", pool); 1865 1866 down_write(&mdsc->pool_perm_rwsem); 1867 p = &mdsc->pool_perm_tree.rb_node; 1868 parent = NULL; 1869 while (*p) { 1870 parent = *p; 1871 perm = rb_entry(parent, struct ceph_pool_perm, node); 1872 if (pool < perm->pool) 1873 p = &(*p)->rb_left; 1874 else if (pool > perm->pool) 1875 p = &(*p)->rb_right; 1876 else { 1877 int ret = ceph_compare_string(pool_ns, 1878 perm->pool_ns, 1879 perm->pool_ns_len); 1880 if (ret < 0) 1881 p = &(*p)->rb_left; 1882 else if (ret > 0) 1883 p = &(*p)->rb_right; 1884 else { 1885 have = perm->perm; 1886 break; 1887 } 1888 } 1889 } 1890 if (*p) { 1891 up_write(&mdsc->pool_perm_rwsem); 1892 goto out; 1893 } 1894 1895 rd_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL, 1896 1, false, GFP_NOFS); 1897 if (!rd_req) { 1898 err = -ENOMEM; 1899 goto out_unlock; 1900 } 1901 1902 rd_req->r_flags = CEPH_OSD_FLAG_READ; 1903 osd_req_op_init(rd_req, 0, CEPH_OSD_OP_STAT, 0); 1904 rd_req->r_base_oloc.pool = pool; 1905 if (pool_ns) 1906 rd_req->r_base_oloc.pool_ns = ceph_get_string(pool_ns); 1907 ceph_oid_printf(&rd_req->r_base_oid, "%llx.00000000", ci->i_vino.ino); 1908 1909 err = ceph_osdc_alloc_messages(rd_req, GFP_NOFS); 1910 if (err) 1911 goto out_unlock; 1912 1913 wr_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL, 1914 1, false, GFP_NOFS); 1915 if (!wr_req) { 1916 err = -ENOMEM; 1917 goto out_unlock; 1918 } 1919 1920 wr_req->r_flags = CEPH_OSD_FLAG_WRITE; 1921 osd_req_op_init(wr_req, 0, CEPH_OSD_OP_CREATE, CEPH_OSD_OP_FLAG_EXCL); 1922 ceph_oloc_copy(&wr_req->r_base_oloc, &rd_req->r_base_oloc); 1923 ceph_oid_copy(&wr_req->r_base_oid, &rd_req->r_base_oid); 1924 1925 err = ceph_osdc_alloc_messages(wr_req, GFP_NOFS); 1926 if (err) 1927 goto out_unlock; 1928 1929 /* one page should be large enough for STAT data */ 1930 pages = ceph_alloc_page_vector(1, GFP_KERNEL); 1931 if (IS_ERR(pages)) { 1932 err = PTR_ERR(pages); 1933 goto out_unlock; 1934 } 1935 1936 osd_req_op_raw_data_in_pages(rd_req, 0, pages, PAGE_SIZE, 1937 0, false, true); 1938 err = ceph_osdc_start_request(&fsc->client->osdc, rd_req, false); 1939 1940 wr_req->r_mtime = timespec64_to_timespec(ci->vfs_inode.i_mtime); 1941 err2 = ceph_osdc_start_request(&fsc->client->osdc, wr_req, false); 1942 1943 if (!err) 1944 err = ceph_osdc_wait_request(&fsc->client->osdc, rd_req); 1945 if (!err2) 1946 err2 = ceph_osdc_wait_request(&fsc->client->osdc, wr_req); 1947 1948 if (err >= 0 || err == -ENOENT) 1949 have |= POOL_READ; 1950 else if (err != -EPERM) 1951 goto out_unlock; 1952 1953 if (err2 == 0 || err2 == -EEXIST) 1954 have |= POOL_WRITE; 1955 else if (err2 != -EPERM) { 1956 err = err2; 1957 goto out_unlock; 1958 } 1959 1960 pool_ns_len = pool_ns ? pool_ns->len : 0; 1961 perm = kmalloc(sizeof(*perm) + pool_ns_len + 1, GFP_NOFS); 1962 if (!perm) { 1963 err = -ENOMEM; 1964 goto out_unlock; 1965 } 1966 1967 perm->pool = pool; 1968 perm->perm = have; 1969 perm->pool_ns_len = pool_ns_len; 1970 if (pool_ns_len > 0) 1971 memcpy(perm->pool_ns, pool_ns->str, pool_ns_len); 1972 perm->pool_ns[pool_ns_len] = 0; 1973 1974 rb_link_node(&perm->node, parent, p); 1975 rb_insert_color(&perm->node, &mdsc->pool_perm_tree); 1976 err = 0; 1977 out_unlock: 1978 up_write(&mdsc->pool_perm_rwsem); 1979 1980 ceph_osdc_put_request(rd_req); 1981 ceph_osdc_put_request(wr_req); 1982 out: 1983 if (!err) 1984 err = have; 1985 if (pool_ns) 1986 dout("__ceph_pool_perm_get pool %lld ns %.*s result = %d\n", 1987 pool, (int)pool_ns->len, pool_ns->str, err); 1988 else 1989 dout("__ceph_pool_perm_get pool %lld result = %d\n", pool, err); 1990 return err; 1991 } 1992 1993 int ceph_pool_perm_check(struct ceph_inode_info *ci, int need) 1994 { 1995 s64 pool; 1996 struct ceph_string *pool_ns; 1997 int ret, flags; 1998 1999 if (ci->i_vino.snap != CEPH_NOSNAP) { 2000 /* 2001 * Pool permission check needs to write to the first object. 2002 * But for snapshot, head of the first object may have alread 2003 * been deleted. Skip check to avoid creating orphan object. 2004 */ 2005 return 0; 2006 } 2007 2008 if (ceph_test_mount_opt(ceph_inode_to_client(&ci->vfs_inode), 2009 NOPOOLPERM)) 2010 return 0; 2011 2012 spin_lock(&ci->i_ceph_lock); 2013 flags = ci->i_ceph_flags; 2014 pool = ci->i_layout.pool_id; 2015 spin_unlock(&ci->i_ceph_lock); 2016 check: 2017 if (flags & CEPH_I_POOL_PERM) { 2018 if ((need & CEPH_CAP_FILE_RD) && !(flags & CEPH_I_POOL_RD)) { 2019 dout("ceph_pool_perm_check pool %lld no read perm\n", 2020 pool); 2021 return -EPERM; 2022 } 2023 if ((need & CEPH_CAP_FILE_WR) && !(flags & CEPH_I_POOL_WR)) { 2024 dout("ceph_pool_perm_check pool %lld no write perm\n", 2025 pool); 2026 return -EPERM; 2027 } 2028 return 0; 2029 } 2030 2031 pool_ns = ceph_try_get_string(ci->i_layout.pool_ns); 2032 ret = __ceph_pool_perm_get(ci, pool, pool_ns); 2033 ceph_put_string(pool_ns); 2034 if (ret < 0) 2035 return ret; 2036 2037 flags = CEPH_I_POOL_PERM; 2038 if (ret & POOL_READ) 2039 flags |= CEPH_I_POOL_RD; 2040 if (ret & POOL_WRITE) 2041 flags |= CEPH_I_POOL_WR; 2042 2043 spin_lock(&ci->i_ceph_lock); 2044 if (pool == ci->i_layout.pool_id && 2045 pool_ns == rcu_dereference_raw(ci->i_layout.pool_ns)) { 2046 ci->i_ceph_flags |= flags; 2047 } else { 2048 pool = ci->i_layout.pool_id; 2049 flags = ci->i_ceph_flags; 2050 } 2051 spin_unlock(&ci->i_ceph_lock); 2052 goto check; 2053 } 2054 2055 void ceph_pool_perm_destroy(struct ceph_mds_client *mdsc) 2056 { 2057 struct ceph_pool_perm *perm; 2058 struct rb_node *n; 2059 2060 while (!RB_EMPTY_ROOT(&mdsc->pool_perm_tree)) { 2061 n = rb_first(&mdsc->pool_perm_tree); 2062 perm = rb_entry(n, struct ceph_pool_perm, node); 2063 rb_erase(n, &mdsc->pool_perm_tree); 2064 kfree(perm); 2065 } 2066 } 2067