1
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>
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
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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
61static 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
70
71
72static 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
94 spin_lock(&ci->i_ceph_lock);
95 BUG_ON(ci->i_wr_ref == 0);
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
121
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
136
137
138
139static 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
172static 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
178 if (!ceph_release_fscache_page(page, g))
179 return 0;
180
181 return !PagePrivate(page);
182}
183
184
185
186
187static 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
206
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
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
241out:
242 return err < 0 ? err : 0;
243}
244
245static 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
257
258static 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
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
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);
291unlock:
292 unlock_page(page);
293 put_page(page);
294 bytes -= PAGE_SIZE;
295 }
296 kfree(osd_data->pages);
297}
298
299
300
301
302
303static 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
323
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
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
372 nr_pages = calc_pages_for(0, len);
373 pages = kmalloc(sizeof(*pages) * nr_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
412
413 if (got)
414 ceph_put_cap_refs(ci, got);
415
416 return nr_pages;
417
418out_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);
424out_put:
425 ceph_osdc_put_request(req);
426out:
427 if (got)
428 ceph_put_cap_refs(ci, got);
429 return ret;
430}
431
432
433
434
435
436
437static 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 }
465out:
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
472struct 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
483
484
485static struct ceph_snap_context *
486get_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
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
542static 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
571
572
573
574
575static int writepage_nounlock(struct page *page, struct writeback_control *wbc)
576{
577 struct inode *inode;
578 struct ceph_inode_info *ci;
579 struct ceph_fs_client *fsc;
580 struct ceph_snap_context *snapc, *oldest;
581 loff_t page_off = page_offset(page);
582 int err, len = PAGE_SIZE;
583 struct ceph_writeback_ctl ceph_wbc;
584
585 dout("writepage %p idx %lu\n", page, page->index);
586
587 inode = page->mapping->host;
588 ci = ceph_inode(inode);
589 fsc = ceph_inode_to_client(inode);
590
591
592 snapc = page_snap_context(page);
593 if (!snapc) {
594 dout("writepage %p page %p not dirty?\n", inode, page);
595 return 0;
596 }
597 oldest = get_oldest_context(inode, &ceph_wbc, snapc);
598 if (snapc->seq > oldest->seq) {
599 dout("writepage %p page %p snapc %p not writeable - noop\n",
600 inode, page, snapc);
601
602 WARN_ON(!(current->flags & PF_MEMALLOC));
603 ceph_put_snap_context(oldest);
604 redirty_page_for_writepage(wbc, page);
605 return 0;
606 }
607 ceph_put_snap_context(oldest);
608
609
610 if (page_off >= ceph_wbc.i_size) {
611 dout("%p page eof %llu\n", page, ceph_wbc.i_size);
612 page->mapping->a_ops->invalidatepage(page, 0, PAGE_SIZE);
613 return 0;
614 }
615
616 if (ceph_wbc.i_size < page_off + len)
617 len = ceph_wbc.i_size - page_off;
618
619 dout("writepage %p page %p index %lu on %llu~%u snapc %p seq %lld\n",
620 inode, page, page->index, page_off, len, snapc, snapc->seq);
621
622 if (atomic_long_inc_return(&fsc->writeback_count) >
623 CONGESTION_ON_THRESH(fsc->mount_options->congestion_kb))
624 set_bdi_congested(inode_to_bdi(inode), BLK_RW_ASYNC);
625
626 set_page_writeback(page);
627 err = ceph_osdc_writepages(&fsc->client->osdc, ceph_vino(inode),
628 &ci->i_layout, snapc, page_off, len,
629 ceph_wbc.truncate_seq,
630 ceph_wbc.truncate_size,
631 &inode->i_mtime, &page, 1);
632 if (err < 0) {
633 struct writeback_control tmp_wbc;
634 if (!wbc)
635 wbc = &tmp_wbc;
636 if (err == -ERESTARTSYS) {
637
638 dout("writepage interrupted page %p\n", page);
639 redirty_page_for_writepage(wbc, page);
640 end_page_writeback(page);
641 return err;
642 }
643 dout("writepage setting page/mapping error %d %p\n",
644 err, page);
645 SetPageError(page);
646 mapping_set_error(&inode->i_data, err);
647 wbc->pages_skipped++;
648 } else {
649 dout("writepage cleaned page %p\n", page);
650 err = 0;
651 }
652 page->private = 0;
653 ClearPagePrivate(page);
654 end_page_writeback(page);
655 ceph_put_wrbuffer_cap_refs(ci, 1, snapc);
656 ceph_put_snap_context(snapc);
657
658 if (atomic_long_dec_return(&fsc->writeback_count) <
659 CONGESTION_OFF_THRESH(fsc->mount_options->congestion_kb))
660 clear_bdi_congested(inode_to_bdi(inode), BLK_RW_ASYNC);
661
662 return err;
663}
664
665static int ceph_writepage(struct page *page, struct writeback_control *wbc)
666{
667 int err;
668 struct inode *inode = page->mapping->host;
669 BUG_ON(!inode);
670 ihold(inode);
671 err = writepage_nounlock(page, wbc);
672 if (err == -ERESTARTSYS) {
673
674
675 err = 0;
676 }
677 unlock_page(page);
678 iput(inode);
679 return err;
680}
681
682
683
684
685
686static void ceph_release_pages(struct page **pages, int num)
687{
688 struct pagevec pvec;
689 int i;
690
691 pagevec_init(&pvec);
692 for (i = 0; i < num; i++) {
693 if (pagevec_add(&pvec, pages[i]) == 0)
694 pagevec_release(&pvec);
695 }
696 pagevec_release(&pvec);
697}
698
699
700
701
702
703
704
705static void writepages_finish(struct ceph_osd_request *req)
706{
707 struct inode *inode = req->r_inode;
708 struct ceph_inode_info *ci = ceph_inode(inode);
709 struct ceph_osd_data *osd_data;
710 struct page *page;
711 int num_pages, total_pages = 0;
712 int i, j;
713 int rc = req->r_result;
714 struct ceph_snap_context *snapc = req->r_snapc;
715 struct address_space *mapping = inode->i_mapping;
716 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
717 bool remove_page;
718
719 dout("writepages_finish %p rc %d\n", inode, rc);
720 if (rc < 0) {
721 mapping_set_error(mapping, rc);
722 ceph_set_error_write(ci);
723 } else {
724 ceph_clear_error_write(ci);
725 }
726
727
728
729
730
731
732
733 remove_page = !(ceph_caps_issued(ci) &
734 (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO));
735
736
737 for (i = 0; i < req->r_num_ops; i++) {
738 if (req->r_ops[i].op != CEPH_OSD_OP_WRITE)
739 break;
740
741 osd_data = osd_req_op_extent_osd_data(req, i);
742 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES);
743 num_pages = calc_pages_for((u64)osd_data->alignment,
744 (u64)osd_data->length);
745 total_pages += num_pages;
746 for (j = 0; j < num_pages; j++) {
747 page = osd_data->pages[j];
748 BUG_ON(!page);
749 WARN_ON(!PageUptodate(page));
750
751 if (atomic_long_dec_return(&fsc->writeback_count) <
752 CONGESTION_OFF_THRESH(
753 fsc->mount_options->congestion_kb))
754 clear_bdi_congested(inode_to_bdi(inode),
755 BLK_RW_ASYNC);
756
757 ceph_put_snap_context(page_snap_context(page));
758 page->private = 0;
759 ClearPagePrivate(page);
760 dout("unlocking %p\n", page);
761 end_page_writeback(page);
762
763 if (remove_page)
764 generic_error_remove_page(inode->i_mapping,
765 page);
766
767 unlock_page(page);
768 }
769 dout("writepages_finish %p wrote %llu bytes cleaned %d pages\n",
770 inode, osd_data->length, rc >= 0 ? num_pages : 0);
771
772 ceph_release_pages(osd_data->pages, num_pages);
773 }
774
775 ceph_put_wrbuffer_cap_refs(ci, total_pages, snapc);
776
777 osd_data = osd_req_op_extent_osd_data(req, 0);
778 if (osd_data->pages_from_pool)
779 mempool_free(osd_data->pages,
780 ceph_sb_to_client(inode->i_sb)->wb_pagevec_pool);
781 else
782 kfree(osd_data->pages);
783 ceph_osdc_put_request(req);
784}
785
786
787
788
789static int ceph_writepages_start(struct address_space *mapping,
790 struct writeback_control *wbc)
791{
792 struct inode *inode = mapping->host;
793 struct ceph_inode_info *ci = ceph_inode(inode);
794 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
795 struct ceph_vino vino = ceph_vino(inode);
796 pgoff_t index, start_index, end = -1;
797 struct ceph_snap_context *snapc = NULL, *last_snapc = NULL, *pgsnapc;
798 struct pagevec pvec;
799 int rc = 0;
800 unsigned int wsize = i_blocksize(inode);
801 struct ceph_osd_request *req = NULL;
802 struct ceph_writeback_ctl ceph_wbc;
803 bool should_loop, range_whole = false;
804 bool done = false;
805
806 dout("writepages_start %p (mode=%s)\n", inode,
807 wbc->sync_mode == WB_SYNC_NONE ? "NONE" :
808 (wbc->sync_mode == WB_SYNC_ALL ? "ALL" : "HOLD"));
809
810 if (READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
811 if (ci->i_wrbuffer_ref > 0) {
812 pr_warn_ratelimited(
813 "writepage_start %p %lld forced umount\n",
814 inode, ceph_ino(inode));
815 }
816 mapping_set_error(mapping, -EIO);
817 return -EIO;
818 }
819 if (fsc->mount_options->wsize < wsize)
820 wsize = fsc->mount_options->wsize;
821
822 pagevec_init(&pvec);
823
824 start_index = wbc->range_cyclic ? mapping->writeback_index : 0;
825 index = start_index;
826
827retry:
828
829 snapc = get_oldest_context(inode, &ceph_wbc, NULL);
830 if (!snapc) {
831
832
833 dout(" no snap context with dirty data?\n");
834 goto out;
835 }
836 dout(" oldest snapc is %p seq %lld (%d snaps)\n",
837 snapc, snapc->seq, snapc->num_snaps);
838
839 should_loop = false;
840 if (ceph_wbc.head_snapc && snapc != last_snapc) {
841
842 if (wbc->range_cyclic) {
843 index = start_index;
844 end = -1;
845 if (index > 0)
846 should_loop = true;
847 dout(" cyclic, start at %lu\n", index);
848 } else {
849 index = wbc->range_start >> PAGE_SHIFT;
850 end = wbc->range_end >> PAGE_SHIFT;
851 if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
852 range_whole = true;
853 dout(" not cyclic, %lu to %lu\n", index, end);
854 }
855 } else if (!ceph_wbc.head_snapc) {
856
857
858
859
860 if (index > 0)
861 should_loop = true;
862 dout(" non-head snapc, range whole\n");
863 }
864
865 ceph_put_snap_context(last_snapc);
866 last_snapc = snapc;
867
868 while (!done && index <= end) {
869 int num_ops = 0, op_idx;
870 unsigned i, pvec_pages, max_pages, locked_pages = 0;
871 struct page **pages = NULL, **data_pages;
872 mempool_t *pool = NULL;
873 struct page *page;
874 pgoff_t strip_unit_end = 0;
875 u64 offset = 0, len = 0;
876
877 max_pages = wsize >> PAGE_SHIFT;
878
879get_more_pages:
880 pvec_pages = pagevec_lookup_range_nr_tag(&pvec, mapping, &index,
881 end, PAGECACHE_TAG_DIRTY,
882 max_pages - locked_pages);
883 dout("pagevec_lookup_range_tag got %d\n", pvec_pages);
884 if (!pvec_pages && !locked_pages)
885 break;
886 for (i = 0; i < pvec_pages && locked_pages < max_pages; i++) {
887 page = pvec.pages[i];
888 dout("? %p idx %lu\n", page, page->index);
889 if (locked_pages == 0)
890 lock_page(page);
891 else if (!trylock_page(page))
892 break;
893
894
895 if (unlikely(!PageDirty(page)) ||
896 unlikely(page->mapping != mapping)) {
897 dout("!dirty or !mapping %p\n", page);
898 unlock_page(page);
899 continue;
900 }
901
902 pgsnapc = page_snap_context(page);
903 if (pgsnapc != snapc) {
904 dout("page snapc %p %lld != oldest %p %lld\n",
905 pgsnapc, pgsnapc->seq, snapc, snapc->seq);
906 if (!should_loop &&
907 !ceph_wbc.head_snapc &&
908 wbc->sync_mode != WB_SYNC_NONE)
909 should_loop = true;
910 unlock_page(page);
911 continue;
912 }
913 if (page_offset(page) >= ceph_wbc.i_size) {
914 dout("%p page eof %llu\n",
915 page, ceph_wbc.i_size);
916 if (ceph_wbc.size_stable ||
917 page_offset(page) >= i_size_read(inode))
918 mapping->a_ops->invalidatepage(page,
919 0, PAGE_SIZE);
920 unlock_page(page);
921 continue;
922 }
923 if (strip_unit_end && (page->index > strip_unit_end)) {
924 dout("end of strip unit %p\n", page);
925 unlock_page(page);
926 break;
927 }
928 if (PageWriteback(page)) {
929 if (wbc->sync_mode == WB_SYNC_NONE) {
930 dout("%p under writeback\n", page);
931 unlock_page(page);
932 continue;
933 }
934 dout("waiting on writeback %p\n", page);
935 wait_on_page_writeback(page);
936 }
937
938 if (!clear_page_dirty_for_io(page)) {
939 dout("%p !clear_page_dirty_for_io\n", page);
940 unlock_page(page);
941 continue;
942 }
943
944
945
946
947
948
949
950 if (locked_pages == 0) {
951 u64 objnum;
952 u64 objoff;
953 u32 xlen;
954
955
956 offset = (u64)page_offset(page);
957 ceph_calc_file_object_mapping(&ci->i_layout,
958 offset, wsize,
959 &objnum, &objoff,
960 &xlen);
961 len = xlen;
962
963 num_ops = 1;
964 strip_unit_end = page->index +
965 ((len - 1) >> PAGE_SHIFT);
966
967 BUG_ON(pages);
968 max_pages = calc_pages_for(0, (u64)len);
969 pages = kmalloc(max_pages * sizeof (*pages),
970 GFP_NOFS);
971 if (!pages) {
972 pool = fsc->wb_pagevec_pool;
973 pages = mempool_alloc(pool, GFP_NOFS);
974 BUG_ON(!pages);
975 }
976
977 len = 0;
978 } else if (page->index !=
979 (offset + len) >> PAGE_SHIFT) {
980 if (num_ops >= (pool ? CEPH_OSD_SLAB_OPS :
981 CEPH_OSD_MAX_OPS)) {
982 redirty_page_for_writepage(wbc, page);
983 unlock_page(page);
984 break;
985 }
986
987 num_ops++;
988 offset = (u64)page_offset(page);
989 len = 0;
990 }
991
992
993 dout("%p will write page %p idx %lu\n",
994 inode, page, page->index);
995
996 if (atomic_long_inc_return(&fsc->writeback_count) >
997 CONGESTION_ON_THRESH(
998 fsc->mount_options->congestion_kb)) {
999 set_bdi_congested(inode_to_bdi(inode),
1000 BLK_RW_ASYNC);
1001 }
1002
1003
1004 pages[locked_pages++] = page;
1005 pvec.pages[i] = NULL;
1006
1007 len += PAGE_SIZE;
1008 }
1009
1010
1011 if (!locked_pages)
1012 goto release_pvec_pages;
1013 if (i) {
1014 unsigned j, n = 0;
1015
1016 for (j = 0; j < pvec_pages; j++) {
1017 if (!pvec.pages[j])
1018 continue;
1019 if (n < j)
1020 pvec.pages[n] = pvec.pages[j];
1021 n++;
1022 }
1023 pvec.nr = n;
1024
1025 if (pvec_pages && i == pvec_pages &&
1026 locked_pages < max_pages) {
1027 dout("reached end pvec, trying for more\n");
1028 pagevec_release(&pvec);
1029 goto get_more_pages;
1030 }
1031 }
1032
1033new_request:
1034 offset = page_offset(pages[0]);
1035 len = wsize;
1036
1037 req = ceph_osdc_new_request(&fsc->client->osdc,
1038 &ci->i_layout, vino,
1039 offset, &len, 0, num_ops,
1040 CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE,
1041 snapc, ceph_wbc.truncate_seq,
1042 ceph_wbc.truncate_size, false);
1043 if (IS_ERR(req)) {
1044 req = ceph_osdc_new_request(&fsc->client->osdc,
1045 &ci->i_layout, vino,
1046 offset, &len, 0,
1047 min(num_ops,
1048 CEPH_OSD_SLAB_OPS),
1049 CEPH_OSD_OP_WRITE,
1050 CEPH_OSD_FLAG_WRITE,
1051 snapc, ceph_wbc.truncate_seq,
1052 ceph_wbc.truncate_size, true);
1053 BUG_ON(IS_ERR(req));
1054 }
1055 BUG_ON(len < page_offset(pages[locked_pages - 1]) +
1056 PAGE_SIZE - offset);
1057
1058 req->r_callback = writepages_finish;
1059 req->r_inode = inode;
1060
1061
1062 len = 0;
1063 data_pages = pages;
1064 op_idx = 0;
1065 for (i = 0; i < locked_pages; i++) {
1066 u64 cur_offset = page_offset(pages[i]);
1067 if (offset + len != cur_offset) {
1068 if (op_idx + 1 == req->r_num_ops)
1069 break;
1070 osd_req_op_extent_dup_last(req, op_idx,
1071 cur_offset - offset);
1072 dout("writepages got pages at %llu~%llu\n",
1073 offset, len);
1074 osd_req_op_extent_osd_data_pages(req, op_idx,
1075 data_pages, len, 0,
1076 !!pool, false);
1077 osd_req_op_extent_update(req, op_idx, len);
1078
1079 len = 0;
1080 offset = cur_offset;
1081 data_pages = pages + i;
1082 op_idx++;
1083 }
1084
1085 set_page_writeback(pages[i]);
1086 len += PAGE_SIZE;
1087 }
1088
1089 if (ceph_wbc.size_stable) {
1090 len = min(len, ceph_wbc.i_size - offset);
1091 } else if (i == locked_pages) {
1092
1093
1094
1095 u64 min_len = len + 1 - PAGE_SIZE;
1096 len = get_writepages_data_length(inode, pages[i - 1],
1097 offset);
1098 len = max(len, min_len);
1099 }
1100 dout("writepages got pages at %llu~%llu\n", offset, len);
1101
1102 osd_req_op_extent_osd_data_pages(req, op_idx, data_pages, len,
1103 0, !!pool, false);
1104 osd_req_op_extent_update(req, op_idx, len);
1105
1106 BUG_ON(op_idx + 1 != req->r_num_ops);
1107
1108 pool = NULL;
1109 if (i < locked_pages) {
1110 BUG_ON(num_ops <= req->r_num_ops);
1111 num_ops -= req->r_num_ops;
1112 locked_pages -= i;
1113
1114
1115 data_pages = pages;
1116 pages = kmalloc(locked_pages * sizeof (*pages),
1117 GFP_NOFS);
1118 if (!pages) {
1119 pool = fsc->wb_pagevec_pool;
1120 pages = mempool_alloc(pool, GFP_NOFS);
1121 BUG_ON(!pages);
1122 }
1123 memcpy(pages, data_pages + i,
1124 locked_pages * sizeof(*pages));
1125 memset(data_pages + i, 0,
1126 locked_pages * sizeof(*pages));
1127 } else {
1128 BUG_ON(num_ops != req->r_num_ops);
1129 index = pages[i - 1]->index + 1;
1130
1131 pages = NULL;
1132 }
1133
1134 req->r_mtime = inode->i_mtime;
1135 rc = ceph_osdc_start_request(&fsc->client->osdc, req, true);
1136 BUG_ON(rc);
1137 req = NULL;
1138
1139 wbc->nr_to_write -= i;
1140 if (pages)
1141 goto new_request;
1142
1143
1144
1145
1146
1147
1148
1149 if (wbc->nr_to_write <= 0 && wbc->sync_mode == WB_SYNC_NONE)
1150 done = true;
1151
1152release_pvec_pages:
1153 dout("pagevec_release on %d pages (%p)\n", (int)pvec.nr,
1154 pvec.nr ? pvec.pages[0] : NULL);
1155 pagevec_release(&pvec);
1156 }
1157
1158 if (should_loop && !done) {
1159
1160 dout("writepages looping back to beginning of file\n");
1161 end = start_index - 1;
1162
1163
1164
1165 if (wbc->sync_mode != WB_SYNC_NONE &&
1166 start_index == 0 &&
1167 !ceph_wbc.head_snapc) {
1168 struct page *page;
1169 unsigned i, nr;
1170 index = 0;
1171 while ((index <= end) &&
1172 (nr = pagevec_lookup_tag(&pvec, mapping, &index,
1173 PAGECACHE_TAG_WRITEBACK))) {
1174 for (i = 0; i < nr; i++) {
1175 page = pvec.pages[i];
1176 if (page_snap_context(page) != snapc)
1177 continue;
1178 wait_on_page_writeback(page);
1179 }
1180 pagevec_release(&pvec);
1181 cond_resched();
1182 }
1183 }
1184
1185 start_index = 0;
1186 index = 0;
1187 goto retry;
1188 }
1189
1190 if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
1191 mapping->writeback_index = index;
1192
1193out:
1194 ceph_osdc_put_request(req);
1195 ceph_put_snap_context(last_snapc);
1196 dout("writepages dend - startone, rc = %d\n", rc);
1197 return rc;
1198}
1199
1200
1201
1202
1203
1204
1205static int context_is_writeable_or_written(struct inode *inode,
1206 struct ceph_snap_context *snapc)
1207{
1208 struct ceph_snap_context *oldest = get_oldest_context(inode, NULL, NULL);
1209 int ret = !oldest || snapc->seq <= oldest->seq;
1210
1211 ceph_put_snap_context(oldest);
1212 return ret;
1213}
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223static int ceph_update_writeable_page(struct file *file,
1224 loff_t pos, unsigned len,
1225 struct page *page)
1226{
1227 struct inode *inode = file_inode(file);
1228 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1229 struct ceph_inode_info *ci = ceph_inode(inode);
1230 loff_t page_off = pos & PAGE_MASK;
1231 int pos_in_page = pos & ~PAGE_MASK;
1232 int end_in_page = pos_in_page + len;
1233 loff_t i_size;
1234 int r;
1235 struct ceph_snap_context *snapc, *oldest;
1236
1237 if (READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
1238 dout(" page %p forced umount\n", page);
1239 unlock_page(page);
1240 return -EIO;
1241 }
1242
1243retry_locked:
1244
1245 wait_on_page_writeback(page);
1246
1247 snapc = page_snap_context(page);
1248 if (snapc && snapc != ci->i_head_snapc) {
1249
1250
1251
1252
1253 oldest = get_oldest_context(inode, NULL, NULL);
1254 if (snapc->seq > oldest->seq) {
1255 ceph_put_snap_context(oldest);
1256 dout(" page %p snapc %p not current or oldest\n",
1257 page, snapc);
1258
1259
1260
1261
1262 snapc = ceph_get_snap_context(snapc);
1263 unlock_page(page);
1264 ceph_queue_writeback(inode);
1265 r = wait_event_killable(ci->i_cap_wq,
1266 context_is_writeable_or_written(inode, snapc));
1267 ceph_put_snap_context(snapc);
1268 if (r == -ERESTARTSYS)
1269 return r;
1270 return -EAGAIN;
1271 }
1272 ceph_put_snap_context(oldest);
1273
1274
1275 dout(" page %p snapc %p not current, but oldest\n",
1276 page, snapc);
1277 if (!clear_page_dirty_for_io(page))
1278 goto retry_locked;
1279 r = writepage_nounlock(page, NULL);
1280 if (r < 0)
1281 goto fail_unlock;
1282 goto retry_locked;
1283 }
1284
1285 if (PageUptodate(page)) {
1286 dout(" page %p already uptodate\n", page);
1287 return 0;
1288 }
1289
1290
1291 if (pos_in_page == 0 && len == PAGE_SIZE)
1292 return 0;
1293
1294
1295 i_size = i_size_read(inode);
1296
1297 if (page_off >= i_size ||
1298 (pos_in_page == 0 && (pos+len) >= i_size &&
1299 end_in_page - pos_in_page != PAGE_SIZE)) {
1300 dout(" zeroing %p 0 - %d and %d - %d\n",
1301 page, pos_in_page, end_in_page, (int)PAGE_SIZE);
1302 zero_user_segments(page,
1303 0, pos_in_page,
1304 end_in_page, PAGE_SIZE);
1305 return 0;
1306 }
1307
1308
1309 r = ceph_do_readpage(file, page);
1310 if (r < 0) {
1311 if (r == -EINPROGRESS)
1312 return -EAGAIN;
1313 goto fail_unlock;
1314 }
1315 goto retry_locked;
1316fail_unlock:
1317 unlock_page(page);
1318 return r;
1319}
1320
1321
1322
1323
1324
1325static int ceph_write_begin(struct file *file, struct address_space *mapping,
1326 loff_t pos, unsigned len, unsigned flags,
1327 struct page **pagep, void **fsdata)
1328{
1329 struct inode *inode = file_inode(file);
1330 struct page *page;
1331 pgoff_t index = pos >> PAGE_SHIFT;
1332 int r;
1333
1334 do {
1335
1336 page = grab_cache_page_write_begin(mapping, index, 0);
1337 if (!page)
1338 return -ENOMEM;
1339
1340 dout("write_begin file %p inode %p page %p %d~%d\n", file,
1341 inode, page, (int)pos, (int)len);
1342
1343 r = ceph_update_writeable_page(file, pos, len, page);
1344 if (r < 0)
1345 put_page(page);
1346 else
1347 *pagep = page;
1348 } while (r == -EAGAIN);
1349
1350 return r;
1351}
1352
1353
1354
1355
1356
1357static int ceph_write_end(struct file *file, struct address_space *mapping,
1358 loff_t pos, unsigned len, unsigned copied,
1359 struct page *page, void *fsdata)
1360{
1361 struct inode *inode = file_inode(file);
1362 bool check_cap = false;
1363
1364 dout("write_end file %p inode %p page %p %d~%d (%d)\n", file,
1365 inode, page, (int)pos, (int)copied, (int)len);
1366
1367
1368 if (!PageUptodate(page)) {
1369 if (copied < len) {
1370 copied = 0;
1371 goto out;
1372 }
1373 SetPageUptodate(page);
1374 }
1375
1376
1377 if (pos+copied > i_size_read(inode))
1378 check_cap = ceph_inode_set_size(inode, pos+copied);
1379
1380 set_page_dirty(page);
1381
1382out:
1383 unlock_page(page);
1384 put_page(page);
1385
1386 if (check_cap)
1387 ceph_check_caps(ceph_inode(inode), CHECK_CAPS_AUTHONLY, NULL);
1388
1389 return copied;
1390}
1391
1392
1393
1394
1395
1396
1397static ssize_t ceph_direct_io(struct kiocb *iocb, struct iov_iter *iter)
1398{
1399 WARN_ON(1);
1400 return -EINVAL;
1401}
1402
1403const struct address_space_operations ceph_aops = {
1404 .readpage = ceph_readpage,
1405 .readpages = ceph_readpages,
1406 .writepage = ceph_writepage,
1407 .writepages = ceph_writepages_start,
1408 .write_begin = ceph_write_begin,
1409 .write_end = ceph_write_end,
1410 .set_page_dirty = ceph_set_page_dirty,
1411 .invalidatepage = ceph_invalidatepage,
1412 .releasepage = ceph_releasepage,
1413 .direct_IO = ceph_direct_io,
1414};
1415
1416static void ceph_block_sigs(sigset_t *oldset)
1417{
1418 sigset_t mask;
1419 siginitsetinv(&mask, sigmask(SIGKILL));
1420 sigprocmask(SIG_BLOCK, &mask, oldset);
1421}
1422
1423static void ceph_restore_sigs(sigset_t *oldset)
1424{
1425 sigprocmask(SIG_SETMASK, oldset, NULL);
1426}
1427
1428
1429
1430
1431static int ceph_filemap_fault(struct vm_fault *vmf)
1432{
1433 struct vm_area_struct *vma = vmf->vma;
1434 struct inode *inode = file_inode(vma->vm_file);
1435 struct ceph_inode_info *ci = ceph_inode(inode);
1436 struct ceph_file_info *fi = vma->vm_file->private_data;
1437 struct page *pinned_page = NULL;
1438 loff_t off = vmf->pgoff << PAGE_SHIFT;
1439 int want, got, ret;
1440 sigset_t oldset;
1441
1442 ceph_block_sigs(&oldset);
1443
1444 dout("filemap_fault %p %llx.%llx %llu~%zd trying to get caps\n",
1445 inode, ceph_vinop(inode), off, (size_t)PAGE_SIZE);
1446 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1447 want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
1448 else
1449 want = CEPH_CAP_FILE_CACHE;
1450
1451 got = 0;
1452 ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, -1, &got, &pinned_page);
1453 if (ret < 0)
1454 goto out_restore;
1455
1456 dout("filemap_fault %p %llu~%zd got cap refs on %s\n",
1457 inode, off, (size_t)PAGE_SIZE, ceph_cap_string(got));
1458
1459 if ((got & (CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO)) ||
1460 ci->i_inline_version == CEPH_INLINE_NONE) {
1461 CEPH_DEFINE_RW_CONTEXT(rw_ctx, got);
1462 ceph_add_rw_context(fi, &rw_ctx);
1463 ret = filemap_fault(vmf);
1464 ceph_del_rw_context(fi, &rw_ctx);
1465 } else
1466 ret = -EAGAIN;
1467
1468 dout("filemap_fault %p %llu~%zd dropping cap refs on %s ret %d\n",
1469 inode, off, (size_t)PAGE_SIZE, ceph_cap_string(got), ret);
1470 if (pinned_page)
1471 put_page(pinned_page);
1472 ceph_put_cap_refs(ci, got);
1473
1474 if (ret != -EAGAIN)
1475 goto out_restore;
1476
1477
1478 if (off >= PAGE_SIZE) {
1479
1480 ret = VM_FAULT_SIGBUS;
1481 } else {
1482 int ret1;
1483 struct address_space *mapping = inode->i_mapping;
1484 struct page *page = find_or_create_page(mapping, 0,
1485 mapping_gfp_constraint(mapping,
1486 ~__GFP_FS));
1487 if (!page) {
1488 ret = VM_FAULT_OOM;
1489 goto out_inline;
1490 }
1491 ret1 = __ceph_do_getattr(inode, page,
1492 CEPH_STAT_CAP_INLINE_DATA, true);
1493 if (ret1 < 0 || off >= i_size_read(inode)) {
1494 unlock_page(page);
1495 put_page(page);
1496 if (ret1 < 0)
1497 ret = ret1;
1498 else
1499 ret = VM_FAULT_SIGBUS;
1500 goto out_inline;
1501 }
1502 if (ret1 < PAGE_SIZE)
1503 zero_user_segment(page, ret1, PAGE_SIZE);
1504 else
1505 flush_dcache_page(page);
1506 SetPageUptodate(page);
1507 vmf->page = page;
1508 ret = VM_FAULT_MAJOR | VM_FAULT_LOCKED;
1509out_inline:
1510 dout("filemap_fault %p %llu~%zd read inline data ret %d\n",
1511 inode, off, (size_t)PAGE_SIZE, ret);
1512 }
1513out_restore:
1514 ceph_restore_sigs(&oldset);
1515 if (ret < 0)
1516 ret = (ret == -ENOMEM) ? VM_FAULT_OOM : VM_FAULT_SIGBUS;
1517
1518 return ret;
1519}
1520
1521
1522
1523
1524static int ceph_page_mkwrite(struct vm_fault *vmf)
1525{
1526 struct vm_area_struct *vma = vmf->vma;
1527 struct inode *inode = file_inode(vma->vm_file);
1528 struct ceph_inode_info *ci = ceph_inode(inode);
1529 struct ceph_file_info *fi = vma->vm_file->private_data;
1530 struct ceph_cap_flush *prealloc_cf;
1531 struct page *page = vmf->page;
1532 loff_t off = page_offset(page);
1533 loff_t size = i_size_read(inode);
1534 size_t len;
1535 int want, got, ret;
1536 sigset_t oldset;
1537
1538 prealloc_cf = ceph_alloc_cap_flush();
1539 if (!prealloc_cf)
1540 return VM_FAULT_OOM;
1541
1542 ceph_block_sigs(&oldset);
1543
1544 if (ci->i_inline_version != CEPH_INLINE_NONE) {
1545 struct page *locked_page = NULL;
1546 if (off == 0) {
1547 lock_page(page);
1548 locked_page = page;
1549 }
1550 ret = ceph_uninline_data(vma->vm_file, locked_page);
1551 if (locked_page)
1552 unlock_page(locked_page);
1553 if (ret < 0)
1554 goto out_free;
1555 }
1556
1557 if (off + PAGE_SIZE <= size)
1558 len = PAGE_SIZE;
1559 else
1560 len = size & ~PAGE_MASK;
1561
1562 dout("page_mkwrite %p %llx.%llx %llu~%zd getting caps i_size %llu\n",
1563 inode, ceph_vinop(inode), off, len, size);
1564 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1565 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
1566 else
1567 want = CEPH_CAP_FILE_BUFFER;
1568
1569 got = 0;
1570 ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, off + len,
1571 &got, NULL);
1572 if (ret < 0)
1573 goto out_free;
1574
1575 dout("page_mkwrite %p %llu~%zd got cap refs on %s\n",
1576 inode, off, len, ceph_cap_string(got));
1577
1578
1579 file_update_time(vma->vm_file);
1580
1581 do {
1582 lock_page(page);
1583
1584 if ((off > size) || (page->mapping != inode->i_mapping)) {
1585 unlock_page(page);
1586 ret = VM_FAULT_NOPAGE;
1587 break;
1588 }
1589
1590 ret = ceph_update_writeable_page(vma->vm_file, off, len, page);
1591 if (ret >= 0) {
1592
1593 set_page_dirty(page);
1594 ret = VM_FAULT_LOCKED;
1595 }
1596 } while (ret == -EAGAIN);
1597
1598 if (ret == VM_FAULT_LOCKED ||
1599 ci->i_inline_version != CEPH_INLINE_NONE) {
1600 int dirty;
1601 spin_lock(&ci->i_ceph_lock);
1602 ci->i_inline_version = CEPH_INLINE_NONE;
1603 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
1604 &prealloc_cf);
1605 spin_unlock(&ci->i_ceph_lock);
1606 if (dirty)
1607 __mark_inode_dirty(inode, dirty);
1608 }
1609
1610 dout("page_mkwrite %p %llu~%zd dropping cap refs on %s ret %d\n",
1611 inode, off, len, ceph_cap_string(got), ret);
1612 ceph_put_cap_refs(ci, got);
1613out_free:
1614 ceph_restore_sigs(&oldset);
1615 ceph_free_cap_flush(prealloc_cf);
1616 if (ret < 0)
1617 ret = (ret == -ENOMEM) ? VM_FAULT_OOM : VM_FAULT_SIGBUS;
1618 return ret;
1619}
1620
1621void ceph_fill_inline_data(struct inode *inode, struct page *locked_page,
1622 char *data, size_t len)
1623{
1624 struct address_space *mapping = inode->i_mapping;
1625 struct page *page;
1626
1627 if (locked_page) {
1628 page = locked_page;
1629 } else {
1630 if (i_size_read(inode) == 0)
1631 return;
1632 page = find_or_create_page(mapping, 0,
1633 mapping_gfp_constraint(mapping,
1634 ~__GFP_FS));
1635 if (!page)
1636 return;
1637 if (PageUptodate(page)) {
1638 unlock_page(page);
1639 put_page(page);
1640 return;
1641 }
1642 }
1643
1644 dout("fill_inline_data %p %llx.%llx len %zu locked_page %p\n",
1645 inode, ceph_vinop(inode), len, locked_page);
1646
1647 if (len > 0) {
1648 void *kaddr = kmap_atomic(page);
1649 memcpy(kaddr, data, len);
1650 kunmap_atomic(kaddr);
1651 }
1652
1653 if (page != locked_page) {
1654 if (len < PAGE_SIZE)
1655 zero_user_segment(page, len, PAGE_SIZE);
1656 else
1657 flush_dcache_page(page);
1658
1659 SetPageUptodate(page);
1660 unlock_page(page);
1661 put_page(page);
1662 }
1663}
1664
1665int ceph_uninline_data(struct file *filp, struct page *locked_page)
1666{
1667 struct inode *inode = file_inode(filp);
1668 struct ceph_inode_info *ci = ceph_inode(inode);
1669 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1670 struct ceph_osd_request *req;
1671 struct page *page = NULL;
1672 u64 len, inline_version;
1673 int err = 0;
1674 bool from_pagecache = false;
1675
1676 spin_lock(&ci->i_ceph_lock);
1677 inline_version = ci->i_inline_version;
1678 spin_unlock(&ci->i_ceph_lock);
1679
1680 dout("uninline_data %p %llx.%llx inline_version %llu\n",
1681 inode, ceph_vinop(inode), inline_version);
1682
1683 if (inline_version == 1 ||
1684 inline_version == CEPH_INLINE_NONE)
1685 goto out;
1686
1687 if (locked_page) {
1688 page = locked_page;
1689 WARN_ON(!PageUptodate(page));
1690 } else if (ceph_caps_issued(ci) &
1691 (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) {
1692 page = find_get_page(inode->i_mapping, 0);
1693 if (page) {
1694 if (PageUptodate(page)) {
1695 from_pagecache = true;
1696 lock_page(page);
1697 } else {
1698 put_page(page);
1699 page = NULL;
1700 }
1701 }
1702 }
1703
1704 if (page) {
1705 len = i_size_read(inode);
1706 if (len > PAGE_SIZE)
1707 len = PAGE_SIZE;
1708 } else {
1709 page = __page_cache_alloc(GFP_NOFS);
1710 if (!page) {
1711 err = -ENOMEM;
1712 goto out;
1713 }
1714 err = __ceph_do_getattr(inode, page,
1715 CEPH_STAT_CAP_INLINE_DATA, true);
1716 if (err < 0) {
1717
1718 if (err == -ENODATA)
1719 err = 0;
1720 goto out;
1721 }
1722 len = err;
1723 }
1724
1725 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1726 ceph_vino(inode), 0, &len, 0, 1,
1727 CEPH_OSD_OP_CREATE, CEPH_OSD_FLAG_WRITE,
1728 NULL, 0, 0, false);
1729 if (IS_ERR(req)) {
1730 err = PTR_ERR(req);
1731 goto out;
1732 }
1733
1734 req->r_mtime = inode->i_mtime;
1735 err = ceph_osdc_start_request(&fsc->client->osdc, req, false);
1736 if (!err)
1737 err = ceph_osdc_wait_request(&fsc->client->osdc, req);
1738 ceph_osdc_put_request(req);
1739 if (err < 0)
1740 goto out;
1741
1742 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1743 ceph_vino(inode), 0, &len, 1, 3,
1744 CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE,
1745 NULL, ci->i_truncate_seq,
1746 ci->i_truncate_size, false);
1747 if (IS_ERR(req)) {
1748 err = PTR_ERR(req);
1749 goto out;
1750 }
1751
1752 osd_req_op_extent_osd_data_pages(req, 1, &page, len, 0, false, false);
1753
1754 {
1755 __le64 xattr_buf = cpu_to_le64(inline_version);
1756 err = osd_req_op_xattr_init(req, 0, CEPH_OSD_OP_CMPXATTR,
1757 "inline_version", &xattr_buf,
1758 sizeof(xattr_buf),
1759 CEPH_OSD_CMPXATTR_OP_GT,
1760 CEPH_OSD_CMPXATTR_MODE_U64);
1761 if (err)
1762 goto out_put;
1763 }
1764
1765 {
1766 char xattr_buf[32];
1767 int xattr_len = snprintf(xattr_buf, sizeof(xattr_buf),
1768 "%llu", inline_version);
1769 err = osd_req_op_xattr_init(req, 2, CEPH_OSD_OP_SETXATTR,
1770 "inline_version",
1771 xattr_buf, xattr_len, 0, 0);
1772 if (err)
1773 goto out_put;
1774 }
1775
1776 req->r_mtime = inode->i_mtime;
1777 err = ceph_osdc_start_request(&fsc->client->osdc, req, false);
1778 if (!err)
1779 err = ceph_osdc_wait_request(&fsc->client->osdc, req);
1780out_put:
1781 ceph_osdc_put_request(req);
1782 if (err == -ECANCELED)
1783 err = 0;
1784out:
1785 if (page && page != locked_page) {
1786 if (from_pagecache) {
1787 unlock_page(page);
1788 put_page(page);
1789 } else
1790 __free_pages(page, 0);
1791 }
1792
1793 dout("uninline_data %p %llx.%llx inline_version %llu = %d\n",
1794 inode, ceph_vinop(inode), inline_version, err);
1795 return err;
1796}
1797
1798static const struct vm_operations_struct ceph_vmops = {
1799 .fault = ceph_filemap_fault,
1800 .page_mkwrite = ceph_page_mkwrite,
1801};
1802
1803int ceph_mmap(struct file *file, struct vm_area_struct *vma)
1804{
1805 struct address_space *mapping = file->f_mapping;
1806
1807 if (!mapping->a_ops->readpage)
1808 return -ENOEXEC;
1809 file_accessed(file);
1810 vma->vm_ops = &ceph_vmops;
1811 return 0;
1812}
1813
1814enum {
1815 POOL_READ = 1,
1816 POOL_WRITE = 2,
1817};
1818
1819static int __ceph_pool_perm_get(struct ceph_inode_info *ci,
1820 s64 pool, struct ceph_string *pool_ns)
1821{
1822 struct ceph_fs_client *fsc = ceph_inode_to_client(&ci->vfs_inode);
1823 struct ceph_mds_client *mdsc = fsc->mdsc;
1824 struct ceph_osd_request *rd_req = NULL, *wr_req = NULL;
1825 struct rb_node **p, *parent;
1826 struct ceph_pool_perm *perm;
1827 struct page **pages;
1828 size_t pool_ns_len;
1829 int err = 0, err2 = 0, have = 0;
1830
1831 down_read(&mdsc->pool_perm_rwsem);
1832 p = &mdsc->pool_perm_tree.rb_node;
1833 while (*p) {
1834 perm = rb_entry(*p, struct ceph_pool_perm, node);
1835 if (pool < perm->pool)
1836 p = &(*p)->rb_left;
1837 else if (pool > perm->pool)
1838 p = &(*p)->rb_right;
1839 else {
1840 int ret = ceph_compare_string(pool_ns,
1841 perm->pool_ns,
1842 perm->pool_ns_len);
1843 if (ret < 0)
1844 p = &(*p)->rb_left;
1845 else if (ret > 0)
1846 p = &(*p)->rb_right;
1847 else {
1848 have = perm->perm;
1849 break;
1850 }
1851 }
1852 }
1853 up_read(&mdsc->pool_perm_rwsem);
1854 if (*p)
1855 goto out;
1856
1857 if (pool_ns)
1858 dout("__ceph_pool_perm_get pool %lld ns %.*s no perm cached\n",
1859 pool, (int)pool_ns->len, pool_ns->str);
1860 else
1861 dout("__ceph_pool_perm_get pool %lld no perm cached\n", pool);
1862
1863 down_write(&mdsc->pool_perm_rwsem);
1864 p = &mdsc->pool_perm_tree.rb_node;
1865 parent = NULL;
1866 while (*p) {
1867 parent = *p;
1868 perm = rb_entry(parent, struct ceph_pool_perm, node);
1869 if (pool < perm->pool)
1870 p = &(*p)->rb_left;
1871 else if (pool > perm->pool)
1872 p = &(*p)->rb_right;
1873 else {
1874 int ret = ceph_compare_string(pool_ns,
1875 perm->pool_ns,
1876 perm->pool_ns_len);
1877 if (ret < 0)
1878 p = &(*p)->rb_left;
1879 else if (ret > 0)
1880 p = &(*p)->rb_right;
1881 else {
1882 have = perm->perm;
1883 break;
1884 }
1885 }
1886 }
1887 if (*p) {
1888 up_write(&mdsc->pool_perm_rwsem);
1889 goto out;
1890 }
1891
1892 rd_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL,
1893 1, false, GFP_NOFS);
1894 if (!rd_req) {
1895 err = -ENOMEM;
1896 goto out_unlock;
1897 }
1898
1899 rd_req->r_flags = CEPH_OSD_FLAG_READ;
1900 osd_req_op_init(rd_req, 0, CEPH_OSD_OP_STAT, 0);
1901 rd_req->r_base_oloc.pool = pool;
1902 if (pool_ns)
1903 rd_req->r_base_oloc.pool_ns = ceph_get_string(pool_ns);
1904 ceph_oid_printf(&rd_req->r_base_oid, "%llx.00000000", ci->i_vino.ino);
1905
1906 err = ceph_osdc_alloc_messages(rd_req, GFP_NOFS);
1907 if (err)
1908 goto out_unlock;
1909
1910 wr_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL,
1911 1, false, GFP_NOFS);
1912 if (!wr_req) {
1913 err = -ENOMEM;
1914 goto out_unlock;
1915 }
1916
1917 wr_req->r_flags = CEPH_OSD_FLAG_WRITE;
1918 osd_req_op_init(wr_req, 0, CEPH_OSD_OP_CREATE, CEPH_OSD_OP_FLAG_EXCL);
1919 ceph_oloc_copy(&wr_req->r_base_oloc, &rd_req->r_base_oloc);
1920 ceph_oid_copy(&wr_req->r_base_oid, &rd_req->r_base_oid);
1921
1922 err = ceph_osdc_alloc_messages(wr_req, GFP_NOFS);
1923 if (err)
1924 goto out_unlock;
1925
1926
1927 pages = ceph_alloc_page_vector(1, GFP_KERNEL);
1928 if (IS_ERR(pages)) {
1929 err = PTR_ERR(pages);
1930 goto out_unlock;
1931 }
1932
1933 osd_req_op_raw_data_in_pages(rd_req, 0, pages, PAGE_SIZE,
1934 0, false, true);
1935 err = ceph_osdc_start_request(&fsc->client->osdc, rd_req, false);
1936
1937 wr_req->r_mtime = ci->vfs_inode.i_mtime;
1938 wr_req->r_abort_on_full = true;
1939 err2 = ceph_osdc_start_request(&fsc->client->osdc, wr_req, false);
1940
1941 if (!err)
1942 err = ceph_osdc_wait_request(&fsc->client->osdc, rd_req);
1943 if (!err2)
1944 err2 = ceph_osdc_wait_request(&fsc->client->osdc, wr_req);
1945
1946 if (err >= 0 || err == -ENOENT)
1947 have |= POOL_READ;
1948 else if (err != -EPERM)
1949 goto out_unlock;
1950
1951 if (err2 == 0 || err2 == -EEXIST)
1952 have |= POOL_WRITE;
1953 else if (err2 != -EPERM) {
1954 err = err2;
1955 goto out_unlock;
1956 }
1957
1958 pool_ns_len = pool_ns ? pool_ns->len : 0;
1959 perm = kmalloc(sizeof(*perm) + pool_ns_len + 1, GFP_NOFS);
1960 if (!perm) {
1961 err = -ENOMEM;
1962 goto out_unlock;
1963 }
1964
1965 perm->pool = pool;
1966 perm->perm = have;
1967 perm->pool_ns_len = pool_ns_len;
1968 if (pool_ns_len > 0)
1969 memcpy(perm->pool_ns, pool_ns->str, pool_ns_len);
1970 perm->pool_ns[pool_ns_len] = 0;
1971
1972 rb_link_node(&perm->node, parent, p);
1973 rb_insert_color(&perm->node, &mdsc->pool_perm_tree);
1974 err = 0;
1975out_unlock:
1976 up_write(&mdsc->pool_perm_rwsem);
1977
1978 ceph_osdc_put_request(rd_req);
1979 ceph_osdc_put_request(wr_req);
1980out:
1981 if (!err)
1982 err = have;
1983 if (pool_ns)
1984 dout("__ceph_pool_perm_get pool %lld ns %.*s result = %d\n",
1985 pool, (int)pool_ns->len, pool_ns->str, err);
1986 else
1987 dout("__ceph_pool_perm_get pool %lld result = %d\n", pool, err);
1988 return err;
1989}
1990
1991int ceph_pool_perm_check(struct ceph_inode_info *ci, int need)
1992{
1993 s64 pool;
1994 struct ceph_string *pool_ns;
1995 int ret, flags;
1996
1997 if (ci->i_vino.snap != CEPH_NOSNAP) {
1998
1999
2000
2001
2002
2003 return 0;
2004 }
2005
2006 if (ceph_test_mount_opt(ceph_inode_to_client(&ci->vfs_inode),
2007 NOPOOLPERM))
2008 return 0;
2009
2010 spin_lock(&ci->i_ceph_lock);
2011 flags = ci->i_ceph_flags;
2012 pool = ci->i_layout.pool_id;
2013 spin_unlock(&ci->i_ceph_lock);
2014check:
2015 if (flags & CEPH_I_POOL_PERM) {
2016 if ((need & CEPH_CAP_FILE_RD) && !(flags & CEPH_I_POOL_RD)) {
2017 dout("ceph_pool_perm_check pool %lld no read perm\n",
2018 pool);
2019 return -EPERM;
2020 }
2021 if ((need & CEPH_CAP_FILE_WR) && !(flags & CEPH_I_POOL_WR)) {
2022 dout("ceph_pool_perm_check pool %lld no write perm\n",
2023 pool);
2024 return -EPERM;
2025 }
2026 return 0;
2027 }
2028
2029 pool_ns = ceph_try_get_string(ci->i_layout.pool_ns);
2030 ret = __ceph_pool_perm_get(ci, pool, pool_ns);
2031 ceph_put_string(pool_ns);
2032 if (ret < 0)
2033 return ret;
2034
2035 flags = CEPH_I_POOL_PERM;
2036 if (ret & POOL_READ)
2037 flags |= CEPH_I_POOL_RD;
2038 if (ret & POOL_WRITE)
2039 flags |= CEPH_I_POOL_WR;
2040
2041 spin_lock(&ci->i_ceph_lock);
2042 if (pool == ci->i_layout.pool_id &&
2043 pool_ns == rcu_dereference_raw(ci->i_layout.pool_ns)) {
2044 ci->i_ceph_flags |= flags;
2045 } else {
2046 pool = ci->i_layout.pool_id;
2047 flags = ci->i_ceph_flags;
2048 }
2049 spin_unlock(&ci->i_ceph_lock);
2050 goto check;
2051}
2052
2053void ceph_pool_perm_destroy(struct ceph_mds_client *mdsc)
2054{
2055 struct ceph_pool_perm *perm;
2056 struct rb_node *n;
2057
2058 while (!RB_EMPTY_ROOT(&mdsc->pool_perm_tree)) {
2059 n = rb_first(&mdsc->pool_perm_tree);
2060 perm = rb_entry(n, struct ceph_pool_perm, node);
2061 rb_erase(n, &mdsc->pool_perm_tree);
2062 kfree(perm);
2063 }
2064}
2065