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1#include <linux/ceph/ceph_debug.h>
2
3#include <linux/backing-dev.h>
4#include <linux/fs.h>
5#include <linux/mm.h>
6#include <linux/pagemap.h>
7#include <linux/writeback.h> /* generic_writepages */
8#include <linux/slab.h>
9#include <linux/pagevec.h>
10#include <linux/task_io_accounting_ops.h>
11
12#include "super.h"
13#include "mds_client.h"
14#include "cache.h"
15#include <linux/ceph/osd_client.h>
16
17/*
18 * Ceph address space ops.
19 *
20 * There are a few funny things going on here.
21 *
22 * The page->private field is used to reference a struct
23 * ceph_snap_context for _every_ dirty page. This indicates which
24 * snapshot the page was logically dirtied in, and thus which snap
25 * context needs to be associated with the osd write during writeback.
26 *
27 * Similarly, struct ceph_inode_info maintains a set of counters to
28 * count dirty pages on the inode. In the absence of snapshots,
29 * i_wrbuffer_ref == i_wrbuffer_ref_head == the dirty page count.
30 *
31 * When a snapshot is taken (that is, when the client receives
32 * notification that a snapshot was taken), each inode with caps and
33 * with dirty pages (dirty pages implies there is a cap) gets a new
34 * ceph_cap_snap in the i_cap_snaps list (which is sorted in ascending
35 * order, new snaps go to the tail). The i_wrbuffer_ref_head count is
36 * moved to capsnap->dirty. (Unless a sync write is currently in
37 * progress. In that case, the capsnap is said to be "pending", new
38 * writes cannot start, and the capsnap isn't "finalized" until the
39 * write completes (or fails) and a final size/mtime for the inode for
40 * that snap can be settled upon.) i_wrbuffer_ref_head is reset to 0.
41 *
42 * On writeback, we must submit writes to the osd IN SNAP ORDER. So,
43 * we look for the first capsnap in i_cap_snaps and write out pages in
44 * that snap context _only_. Then we move on to the next capsnap,
45 * eventually reaching the "live" or "head" context (i.e., pages that
46 * are not yet snapped) and are writing the most recently dirtied
47 * pages.
48 *
49 * Invalidate and so forth must take care to ensure the dirty page
50 * accounting is preserved.
51 */
52
53#define CONGESTION_ON_THRESH(congestion_kb) (congestion_kb >> (PAGE_SHIFT-10))
54#define CONGESTION_OFF_THRESH(congestion_kb) \
55 (CONGESTION_ON_THRESH(congestion_kb) - \
56 (CONGESTION_ON_THRESH(congestion_kb) >> 2))
57
58static inline struct ceph_snap_context *page_snap_context(struct page *page)
59{
60 if (PagePrivate(page))
61 return (void *)page->private;
62 return NULL;
63}
64
65/*
66 * Dirty a page. Optimistically adjust accounting, on the assumption
67 * that we won't race with invalidate. If we do, readjust.
68 */
69static int ceph_set_page_dirty(struct page *page)
70{
71 struct address_space *mapping = page->mapping;
72 struct inode *inode;
73 struct ceph_inode_info *ci;
74 struct ceph_snap_context *snapc;
75 int ret;
76
77 if (unlikely(!mapping))
78 return !TestSetPageDirty(page);
79
80 if (PageDirty(page)) {
81 dout("%p set_page_dirty %p idx %lu -- already dirty\n",
82 mapping->host, page, page->index);
83 BUG_ON(!PagePrivate(page));
84 return 0;
85 }
86
87 inode = mapping->host;
88 ci = ceph_inode(inode);
89
90 /*
91 * Note that we're grabbing a snapc ref here without holding
92 * any locks!
93 */
94 snapc = ceph_get_snap_context(ci->i_snap_realm->cached_context);
95
96 /* dirty the head */
97 spin_lock(&ci->i_ceph_lock);
98 if (ci->i_head_snapc == NULL)
99 ci->i_head_snapc = ceph_get_snap_context(snapc);
100 ++ci->i_wrbuffer_ref_head;
101 if (ci->i_wrbuffer_ref == 0)
102 ihold(inode);
103 ++ci->i_wrbuffer_ref;
104 dout("%p set_page_dirty %p idx %lu head %d/%d -> %d/%d "
105 "snapc %p seq %lld (%d snaps)\n",
106 mapping->host, page, page->index,
107 ci->i_wrbuffer_ref-1, ci->i_wrbuffer_ref_head-1,
108 ci->i_wrbuffer_ref, ci->i_wrbuffer_ref_head,
109 snapc, snapc->seq, snapc->num_snaps);
110 spin_unlock(&ci->i_ceph_lock);
111
112 /*
113 * Reference snap context in page->private. Also set
114 * PagePrivate so that we get invalidatepage callback.
115 */
116 BUG_ON(PagePrivate(page));
117 page->private = (unsigned long)snapc;
118 SetPagePrivate(page);
119
120 ret = __set_page_dirty_nobuffers(page);
121 WARN_ON(!PageLocked(page));
122 WARN_ON(!page->mapping);
123
124 return ret;
125}
126
127/*
128 * If we are truncating the full page (i.e. offset == 0), adjust the
129 * dirty page counters appropriately. Only called if there is private
130 * data on the page.
131 */
132static void ceph_invalidatepage(struct page *page, unsigned int offset,
133 unsigned int length)
134{
135 struct inode *inode;
136 struct ceph_inode_info *ci;
137 struct ceph_snap_context *snapc = page_snap_context(page);
138
139 inode = page->mapping->host;
140 ci = ceph_inode(inode);
141
142 if (offset != 0 || length != PAGE_CACHE_SIZE) {
143 dout("%p invalidatepage %p idx %lu partial dirty page %u~%u\n",
144 inode, page, page->index, offset, length);
145 return;
146 }
147
148 ceph_invalidate_fscache_page(inode, page);
149
150 if (!PagePrivate(page))
151 return;
152
153 /*
154 * We can get non-dirty pages here due to races between
155 * set_page_dirty and truncate_complete_page; just spit out a
156 * warning, in case we end up with accounting problems later.
157 */
158 if (!PageDirty(page))
159 pr_err("%p invalidatepage %p page not dirty\n", inode, page);
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 struct inode *inode = page->mapping ? page->mapping->host : NULL;
175 dout("%p releasepage %p idx %lu\n", inode, page, page->index);
176 WARN_ON(PageDirty(page));
177
178 /* Can we release the page from the cache? */
179 if (!ceph_release_fscache_page(page, g))
180 return 0;
181
182 return !PagePrivate(page);
183}
184
185/*
186 * read a single page, without unlocking it.
187 */
188static int readpage_nounlock(struct file *filp, struct page *page)
189{
190 struct inode *inode = file_inode(filp);
191 struct ceph_inode_info *ci = ceph_inode(inode);
192 struct ceph_osd_client *osdc =
193 &ceph_inode_to_client(inode)->client->osdc;
194 int err = 0;
195 u64 len = PAGE_CACHE_SIZE;
196
197 err = ceph_readpage_from_fscache(inode, page);
198
199 if (err == 0)
200 goto out;
201
202 dout("readpage inode %p file %p page %p index %lu\n",
203 inode, filp, page, page->index);
204 err = ceph_osdc_readpages(osdc, ceph_vino(inode), &ci->i_layout,
205 (u64) page_offset(page), &len,
206 ci->i_truncate_seq, ci->i_truncate_size,
207 &page, 1, 0);
208 if (err == -ENOENT)
209 err = 0;
210 if (err < 0) {
211 SetPageError(page);
212 ceph_fscache_readpage_cancel(inode, page);
213 goto out;
214 } else {
215 if (err < PAGE_CACHE_SIZE) {
216 /* zero fill remainder of page */
217 zero_user_segment(page, err, PAGE_CACHE_SIZE);
218 } else {
219 flush_dcache_page(page);
220 }
221 }
222 SetPageUptodate(page);
223
224 if (err >= 0)
225 ceph_readpage_to_fscache(inode, page);
226
227out:
228 return err < 0 ? err : 0;
229}
230
231static int ceph_readpage(struct file *filp, struct page *page)
232{
233 int r = readpage_nounlock(filp, page);
234 unlock_page(page);
235 return r;
236}
237
238/*
239 * Finish an async read(ahead) op.
240 */
241static void finish_read(struct ceph_osd_request *req, struct ceph_msg *msg)
242{
243 struct inode *inode = req->r_inode;
244 struct ceph_osd_data *osd_data;
245 int rc = req->r_result;
246 int bytes = le32_to_cpu(msg->hdr.data_len);
247 int num_pages;
248 int i;
249
250 dout("finish_read %p req %p rc %d bytes %d\n", inode, req, rc, bytes);
251
252 /* unlock all pages, zeroing any data we didn't read */
253 osd_data = osd_req_op_extent_osd_data(req, 0);
254 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES);
255 num_pages = calc_pages_for((u64)osd_data->alignment,
256 (u64)osd_data->length);
257 for (i = 0; i < num_pages; i++) {
258 struct page *page = osd_data->pages[i];
259
260 if (rc < 0)
261 goto unlock;
262 if (bytes < (int)PAGE_CACHE_SIZE) {
263 /* zero (remainder of) page */
264 int s = bytes < 0 ? 0 : bytes;
265 zero_user_segment(page, s, PAGE_CACHE_SIZE);
266 }
267 dout("finish_read %p uptodate %p idx %lu\n", inode, page,
268 page->index);
269 flush_dcache_page(page);
270 SetPageUptodate(page);
271 ceph_readpage_to_fscache(inode, page);
272unlock:
273 unlock_page(page);
274 page_cache_release(page);
275 bytes -= PAGE_CACHE_SIZE;
276 }
277 kfree(osd_data->pages);
278}
279
280static void ceph_unlock_page_vector(struct page **pages, int num_pages)
281{
282 int i;
283
284 for (i = 0; i < num_pages; i++)
285 unlock_page(pages[i]);
286}
287
288/*
289 * start an async read(ahead) operation. return nr_pages we submitted
290 * a read for on success, or negative error code.
291 */
292static int start_read(struct inode *inode, struct list_head *page_list, int max)
293{
294 struct ceph_osd_client *osdc =
295 &ceph_inode_to_client(inode)->client->osdc;
296 struct ceph_inode_info *ci = ceph_inode(inode);
297 struct page *page = list_entry(page_list->prev, struct page, lru);
298 struct ceph_vino vino;
299 struct ceph_osd_request *req;
300 u64 off;
301 u64 len;
302 int i;
303 struct page **pages;
304 pgoff_t next_index;
305 int nr_pages = 0;
306 int ret;
307
308 off = (u64) page_offset(page);
309
310 /* count pages */
311 next_index = page->index;
312 list_for_each_entry_reverse(page, page_list, lru) {
313 if (page->index != next_index)
314 break;
315 nr_pages++;
316 next_index++;
317 if (max && nr_pages == max)
318 break;
319 }
320 len = nr_pages << PAGE_CACHE_SHIFT;
321 dout("start_read %p nr_pages %d is %lld~%lld\n", inode, nr_pages,
322 off, len);
323 vino = ceph_vino(inode);
324 req = ceph_osdc_new_request(osdc, &ci->i_layout, vino, off, &len,
325 1, CEPH_OSD_OP_READ,
326 CEPH_OSD_FLAG_READ, NULL,
327 ci->i_truncate_seq, ci->i_truncate_size,
328 false);
329 if (IS_ERR(req))
330 return PTR_ERR(req);
331
332 /* build page vector */
333 nr_pages = calc_pages_for(0, len);
334 pages = kmalloc(sizeof(*pages) * nr_pages, GFP_NOFS);
335 ret = -ENOMEM;
336 if (!pages)
337 goto out;
338 for (i = 0; i < nr_pages; ++i) {
339 page = list_entry(page_list->prev, struct page, lru);
340 BUG_ON(PageLocked(page));
341 list_del(&page->lru);
342
343 dout("start_read %p adding %p idx %lu\n", inode, page,
344 page->index);
345 if (add_to_page_cache_lru(page, &inode->i_data, page->index,
346 GFP_NOFS)) {
347 ceph_fscache_uncache_page(inode, page);
348 page_cache_release(page);
349 dout("start_read %p add_to_page_cache failed %p\n",
350 inode, page);
351 nr_pages = i;
352 goto out_pages;
353 }
354 pages[i] = page;
355 }
356 osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0, false, false);
357 req->r_callback = finish_read;
358 req->r_inode = inode;
359
360 ceph_osdc_build_request(req, off, NULL, vino.snap, NULL);
361
362 dout("start_read %p starting %p %lld~%lld\n", inode, req, off, len);
363 ret = ceph_osdc_start_request(osdc, req, false);
364 if (ret < 0)
365 goto out_pages;
366 ceph_osdc_put_request(req);
367 return nr_pages;
368
369out_pages:
370 ceph_unlock_page_vector(pages, nr_pages);
371 ceph_release_page_vector(pages, nr_pages);
372out:
373 ceph_osdc_put_request(req);
374 return ret;
375}
376
377
378/*
379 * Read multiple pages. Leave pages we don't read + unlock in page_list;
380 * the caller (VM) cleans them up.
381 */
382static int ceph_readpages(struct file *file, struct address_space *mapping,
383 struct list_head *page_list, unsigned nr_pages)
384{
385 struct inode *inode = file_inode(file);
386 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
387 int rc = 0;
388 int max = 0;
389
390 rc = ceph_readpages_from_fscache(mapping->host, mapping, page_list,
391 &nr_pages);
392
393 if (rc == 0)
394 goto out;
395
396 if (fsc->mount_options->rsize >= PAGE_CACHE_SIZE)
397 max = (fsc->mount_options->rsize + PAGE_CACHE_SIZE - 1)
398 >> PAGE_SHIFT;
399
400 dout("readpages %p file %p nr_pages %d max %d\n", inode,
401 file, nr_pages,
402 max);
403 while (!list_empty(page_list)) {
404 rc = start_read(inode, page_list, max);
405 if (rc < 0)
406 goto out;
407 BUG_ON(rc == 0);
408 }
409out:
410 ceph_fscache_readpages_cancel(inode, page_list);
411
412 dout("readpages %p file %p ret %d\n", inode, file, rc);
413 return rc;
414}
415
416/*
417 * Get ref for the oldest snapc for an inode with dirty data... that is, the
418 * only snap context we are allowed to write back.
419 */
420static struct ceph_snap_context *get_oldest_context(struct inode *inode,
421 u64 *snap_size)
422{
423 struct ceph_inode_info *ci = ceph_inode(inode);
424 struct ceph_snap_context *snapc = NULL;
425 struct ceph_cap_snap *capsnap = NULL;
426
427 spin_lock(&ci->i_ceph_lock);
428 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
429 dout(" cap_snap %p snapc %p has %d dirty pages\n", capsnap,
430 capsnap->context, capsnap->dirty_pages);
431 if (capsnap->dirty_pages) {
432 snapc = ceph_get_snap_context(capsnap->context);
433 if (snap_size)
434 *snap_size = capsnap->size;
435 break;
436 }
437 }
438 if (!snapc && ci->i_wrbuffer_ref_head) {
439 snapc = ceph_get_snap_context(ci->i_head_snapc);
440 dout(" head snapc %p has %d dirty pages\n",
441 snapc, ci->i_wrbuffer_ref_head);
442 }
443 spin_unlock(&ci->i_ceph_lock);
444 return snapc;
445}
446
447/*
448 * Write a single page, but leave the page locked.
449 *
450 * If we get a write error, set the page error bit, but still adjust the
451 * dirty page accounting (i.e., page is no longer dirty).
452 */
453static int writepage_nounlock(struct page *page, struct writeback_control *wbc)
454{
455 struct inode *inode;
456 struct ceph_inode_info *ci;
457 struct ceph_fs_client *fsc;
458 struct ceph_osd_client *osdc;
459 struct ceph_snap_context *snapc, *oldest;
460 loff_t page_off = page_offset(page);
461 long writeback_stat;
462 u64 truncate_size, snap_size = 0;
463 u32 truncate_seq;
464 int err = 0, len = PAGE_CACHE_SIZE;
465
466 dout("writepage %p idx %lu\n", page, page->index);
467
468 if (!page->mapping || !page->mapping->host) {
469 dout("writepage %p - no mapping\n", page);
470 return -EFAULT;
471 }
472 inode = page->mapping->host;
473 ci = ceph_inode(inode);
474 fsc = ceph_inode_to_client(inode);
475 osdc = &fsc->client->osdc;
476
477 /* verify this is a writeable snap context */
478 snapc = page_snap_context(page);
479 if (snapc == NULL) {
480 dout("writepage %p page %p not dirty?\n", inode, page);
481 goto out;
482 }
483 oldest = get_oldest_context(inode, &snap_size);
484 if (snapc->seq > oldest->seq) {
485 dout("writepage %p page %p snapc %p not writeable - noop\n",
486 inode, page, snapc);
487 /* we should only noop if called by kswapd */
488 WARN_ON((current->flags & PF_MEMALLOC) == 0);
489 ceph_put_snap_context(oldest);
490 goto out;
491 }
492 ceph_put_snap_context(oldest);
493
494 spin_lock(&ci->i_ceph_lock);
495 truncate_seq = ci->i_truncate_seq;
496 truncate_size = ci->i_truncate_size;
497 if (!snap_size)
498 snap_size = i_size_read(inode);
499 spin_unlock(&ci->i_ceph_lock);
500
501 /* is this a partial page at end of file? */
502 if (page_off >= snap_size) {
503 dout("%p page eof %llu\n", page, snap_size);
504 goto out;
505 }
506 if (snap_size < page_off + len)
507 len = snap_size - page_off;
508
509 dout("writepage %p page %p index %lu on %llu~%u snapc %p\n",
510 inode, page, page->index, page_off, len, snapc);
511
512 writeback_stat = atomic_long_inc_return(&fsc->writeback_count);
513 if (writeback_stat >
514 CONGESTION_ON_THRESH(fsc->mount_options->congestion_kb))
515 set_bdi_congested(&fsc->backing_dev_info, BLK_RW_ASYNC);
516
517 ceph_readpage_to_fscache(inode, page);
518
519 set_page_writeback(page);
520 err = ceph_osdc_writepages(osdc, ceph_vino(inode),
521 &ci->i_layout, snapc,
522 page_off, len,
523 truncate_seq, truncate_size,
524 &inode->i_mtime, &page, 1);
525 if (err < 0) {
526 dout("writepage setting page/mapping error %d %p\n", err, page);
527 SetPageError(page);
528 mapping_set_error(&inode->i_data, err);
529 if (wbc)
530 wbc->pages_skipped++;
531 } else {
532 dout("writepage cleaned page %p\n", page);
533 err = 0; /* vfs expects us to return 0 */
534 }
535 page->private = 0;
536 ClearPagePrivate(page);
537 end_page_writeback(page);
538 ceph_put_wrbuffer_cap_refs(ci, 1, snapc);
539 ceph_put_snap_context(snapc); /* page's reference */
540out:
541 return err;
542}
543
544static int ceph_writepage(struct page *page, struct writeback_control *wbc)
545{
546 int err;
547 struct inode *inode = page->mapping->host;
548 BUG_ON(!inode);
549 ihold(inode);
550 err = writepage_nounlock(page, wbc);
551 unlock_page(page);
552 iput(inode);
553 return err;
554}
555
556
557/*
558 * lame release_pages helper. release_pages() isn't exported to
559 * modules.
560 */
561static void ceph_release_pages(struct page **pages, int num)
562{
563 struct pagevec pvec;
564 int i;
565
566 pagevec_init(&pvec, 0);
567 for (i = 0; i < num; i++) {
568 if (pagevec_add(&pvec, pages[i]) == 0)
569 pagevec_release(&pvec);
570 }
571 pagevec_release(&pvec);
572}
573
574/*
575 * async writeback completion handler.
576 *
577 * If we get an error, set the mapping error bit, but not the individual
578 * page error bits.
579 */
580static void writepages_finish(struct ceph_osd_request *req,
581 struct ceph_msg *msg)
582{
583 struct inode *inode = req->r_inode;
584 struct ceph_inode_info *ci = ceph_inode(inode);
585 struct ceph_osd_data *osd_data;
586 unsigned wrote;
587 struct page *page;
588 int num_pages;
589 int i;
590 struct ceph_snap_context *snapc = req->r_snapc;
591 struct address_space *mapping = inode->i_mapping;
592 int rc = req->r_result;
593 u64 bytes = req->r_ops[0].extent.length;
594 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
595 long writeback_stat;
596 unsigned issued = ceph_caps_issued(ci);
597
598 osd_data = osd_req_op_extent_osd_data(req, 0);
599 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES);
600 num_pages = calc_pages_for((u64)osd_data->alignment,
601 (u64)osd_data->length);
602 if (rc >= 0) {
603 /*
604 * Assume we wrote the pages we originally sent. The
605 * osd might reply with fewer pages if our writeback
606 * raced with a truncation and was adjusted at the osd,
607 * so don't believe the reply.
608 */
609 wrote = num_pages;
610 } else {
611 wrote = 0;
612 mapping_set_error(mapping, rc);
613 }
614 dout("writepages_finish %p rc %d bytes %llu wrote %d (pages)\n",
615 inode, rc, bytes, wrote);
616
617 /* clean all pages */
618 for (i = 0; i < num_pages; i++) {
619 page = osd_data->pages[i];
620 BUG_ON(!page);
621 WARN_ON(!PageUptodate(page));
622
623 writeback_stat =
624 atomic_long_dec_return(&fsc->writeback_count);
625 if (writeback_stat <
626 CONGESTION_OFF_THRESH(fsc->mount_options->congestion_kb))
627 clear_bdi_congested(&fsc->backing_dev_info,
628 BLK_RW_ASYNC);
629
630 ceph_put_snap_context(page_snap_context(page));
631 page->private = 0;
632 ClearPagePrivate(page);
633 dout("unlocking %d %p\n", i, page);
634 end_page_writeback(page);
635
636 /*
637 * We lost the cache cap, need to truncate the page before
638 * it is unlocked, otherwise we'd truncate it later in the
639 * page truncation thread, possibly losing some data that
640 * raced its way in
641 */
642 if ((issued & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0)
643 generic_error_remove_page(inode->i_mapping, page);
644
645 unlock_page(page);
646 }
647 dout("%p wrote+cleaned %d pages\n", inode, wrote);
648 ceph_put_wrbuffer_cap_refs(ci, num_pages, snapc);
649
650 ceph_release_pages(osd_data->pages, num_pages);
651 if (osd_data->pages_from_pool)
652 mempool_free(osd_data->pages,
653 ceph_sb_to_client(inode->i_sb)->wb_pagevec_pool);
654 else
655 kfree(osd_data->pages);
656 ceph_osdc_put_request(req);
657}
658
659/*
660 * initiate async writeback
661 */
662static int ceph_writepages_start(struct address_space *mapping,
663 struct writeback_control *wbc)
664{
665 struct inode *inode = mapping->host;
666 struct ceph_inode_info *ci = ceph_inode(inode);
667 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
668 struct ceph_vino vino = ceph_vino(inode);
669 pgoff_t index, start, end;
670 int range_whole = 0;
671 int should_loop = 1;
672 pgoff_t max_pages = 0, max_pages_ever = 0;
673 struct ceph_snap_context *snapc = NULL, *last_snapc = NULL, *pgsnapc;
674 struct pagevec pvec;
675 int done = 0;
676 int rc = 0;
677 unsigned wsize = 1 << inode->i_blkbits;
678 struct ceph_osd_request *req = NULL;
679 int do_sync;
680 u64 truncate_size, snap_size;
681 u32 truncate_seq;
682
683 /*
684 * Include a 'sync' in the OSD request if this is a data
685 * integrity write (e.g., O_SYNC write or fsync()), or if our
686 * cap is being revoked.
687 */
688 if ((wbc->sync_mode == WB_SYNC_ALL) ||
689 ceph_caps_revoking(ci, CEPH_CAP_FILE_BUFFER))
690 do_sync = 1;
691 dout("writepages_start %p dosync=%d (mode=%s)\n",
692 inode, do_sync,
693 wbc->sync_mode == WB_SYNC_NONE ? "NONE" :
694 (wbc->sync_mode == WB_SYNC_ALL ? "ALL" : "HOLD"));
695
696 if (fsc->mount_state == CEPH_MOUNT_SHUTDOWN) {
697 pr_warning("writepage_start %p on forced umount\n", inode);
698 return -EIO; /* we're in a forced umount, don't write! */
699 }
700 if (fsc->mount_options->wsize && fsc->mount_options->wsize < wsize)
701 wsize = fsc->mount_options->wsize;
702 if (wsize < PAGE_CACHE_SIZE)
703 wsize = PAGE_CACHE_SIZE;
704 max_pages_ever = wsize >> PAGE_CACHE_SHIFT;
705
706 pagevec_init(&pvec, 0);
707
708 /* where to start/end? */
709 if (wbc->range_cyclic) {
710 start = mapping->writeback_index; /* Start from prev offset */
711 end = -1;
712 dout(" cyclic, start at %lu\n", start);
713 } else {
714 start = wbc->range_start >> PAGE_CACHE_SHIFT;
715 end = wbc->range_end >> PAGE_CACHE_SHIFT;
716 if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
717 range_whole = 1;
718 should_loop = 0;
719 dout(" not cyclic, %lu to %lu\n", start, end);
720 }
721 index = start;
722
723retry:
724 /* find oldest snap context with dirty data */
725 ceph_put_snap_context(snapc);
726 snap_size = 0;
727 snapc = get_oldest_context(inode, &snap_size);
728 if (!snapc) {
729 /* hmm, why does writepages get called when there
730 is no dirty data? */
731 dout(" no snap context with dirty data?\n");
732 goto out;
733 }
734 if (snap_size == 0)
735 snap_size = i_size_read(inode);
736 dout(" oldest snapc is %p seq %lld (%d snaps)\n",
737 snapc, snapc->seq, snapc->num_snaps);
738
739 spin_lock(&ci->i_ceph_lock);
740 truncate_seq = ci->i_truncate_seq;
741 truncate_size = ci->i_truncate_size;
742 if (!snap_size)
743 snap_size = i_size_read(inode);
744 spin_unlock(&ci->i_ceph_lock);
745
746 if (last_snapc && snapc != last_snapc) {
747 /* if we switched to a newer snapc, restart our scan at the
748 * start of the original file range. */
749 dout(" snapc differs from last pass, restarting at %lu\n",
750 index);
751 index = start;
752 }
753 last_snapc = snapc;
754
755 while (!done && index <= end) {
756 int num_ops = do_sync ? 2 : 1;
757 unsigned i;
758 int first;
759 pgoff_t next;
760 int pvec_pages, locked_pages;
761 struct page **pages = NULL;
762 mempool_t *pool = NULL; /* Becomes non-null if mempool used */
763 struct page *page;
764 int want;
765 u64 offset, len;
766 long writeback_stat;
767
768 next = 0;
769 locked_pages = 0;
770 max_pages = max_pages_ever;
771
772get_more_pages:
773 first = -1;
774 want = min(end - index,
775 min((pgoff_t)PAGEVEC_SIZE,
776 max_pages - (pgoff_t)locked_pages) - 1)
777 + 1;
778 pvec_pages = pagevec_lookup_tag(&pvec, mapping, &index,
779 PAGECACHE_TAG_DIRTY,
780 want);
781 dout("pagevec_lookup_tag got %d\n", pvec_pages);
782 if (!pvec_pages && !locked_pages)
783 break;
784 for (i = 0; i < pvec_pages && locked_pages < max_pages; i++) {
785 page = pvec.pages[i];
786 dout("? %p idx %lu\n", page, page->index);
787 if (locked_pages == 0)
788 lock_page(page); /* first page */
789 else if (!trylock_page(page))
790 break;
791
792 /* only dirty pages, or our accounting breaks */
793 if (unlikely(!PageDirty(page)) ||
794 unlikely(page->mapping != mapping)) {
795 dout("!dirty or !mapping %p\n", page);
796 unlock_page(page);
797 break;
798 }
799 if (!wbc->range_cyclic && page->index > end) {
800 dout("end of range %p\n", page);
801 done = 1;
802 unlock_page(page);
803 break;
804 }
805 if (next && (page->index != next)) {
806 dout("not consecutive %p\n", page);
807 unlock_page(page);
808 break;
809 }
810 if (wbc->sync_mode != WB_SYNC_NONE) {
811 dout("waiting on writeback %p\n", page);
812 wait_on_page_writeback(page);
813 }
814 if (page_offset(page) >= snap_size) {
815 dout("%p page eof %llu\n", page, snap_size);
816 done = 1;
817 unlock_page(page);
818 break;
819 }
820 if (PageWriteback(page)) {
821 dout("%p under writeback\n", page);
822 unlock_page(page);
823 break;
824 }
825
826 /* only if matching snap context */
827 pgsnapc = page_snap_context(page);
828 if (pgsnapc->seq > snapc->seq) {
829 dout("page snapc %p %lld > oldest %p %lld\n",
830 pgsnapc, pgsnapc->seq, snapc, snapc->seq);
831 unlock_page(page);
832 if (!locked_pages)
833 continue; /* keep looking for snap */
834 break;
835 }
836
837 if (!clear_page_dirty_for_io(page)) {
838 dout("%p !clear_page_dirty_for_io\n", page);
839 unlock_page(page);
840 break;
841 }
842
843 /*
844 * We have something to write. If this is
845 * the first locked page this time through,
846 * allocate an osd request and a page array
847 * that it will use.
848 */
849 if (locked_pages == 0) {
850 BUG_ON(pages);
851 /* prepare async write request */
852 offset = (u64)page_offset(page);
853 len = wsize;
854 req = ceph_osdc_new_request(&fsc->client->osdc,
855 &ci->i_layout, vino,
856 offset, &len, num_ops,
857 CEPH_OSD_OP_WRITE,
858 CEPH_OSD_FLAG_WRITE |
859 CEPH_OSD_FLAG_ONDISK,
860 snapc, truncate_seq,
861 truncate_size, true);
862 if (IS_ERR(req)) {
863 rc = PTR_ERR(req);
864 unlock_page(page);
865 break;
866 }
867
868 req->r_callback = writepages_finish;
869 req->r_inode = inode;
870
871 max_pages = calc_pages_for(0, (u64)len);
872 pages = kmalloc(max_pages * sizeof (*pages),
873 GFP_NOFS);
874 if (!pages) {
875 pool = fsc->wb_pagevec_pool;
876 pages = mempool_alloc(pool, GFP_NOFS);
877 BUG_ON(!pages);
878 }
879 }
880
881 /* note position of first page in pvec */
882 if (first < 0)
883 first = i;
884 dout("%p will write page %p idx %lu\n",
885 inode, page, page->index);
886
887 writeback_stat =
888 atomic_long_inc_return(&fsc->writeback_count);
889 if (writeback_stat > CONGESTION_ON_THRESH(
890 fsc->mount_options->congestion_kb)) {
891 set_bdi_congested(&fsc->backing_dev_info,
892 BLK_RW_ASYNC);
893 }
894
895 set_page_writeback(page);
896 pages[locked_pages] = page;
897 locked_pages++;
898 next = page->index + 1;
899 }
900
901 /* did we get anything? */
902 if (!locked_pages)
903 goto release_pvec_pages;
904 if (i) {
905 int j;
906 BUG_ON(!locked_pages || first < 0);
907
908 if (pvec_pages && i == pvec_pages &&
909 locked_pages < max_pages) {
910 dout("reached end pvec, trying for more\n");
911 pagevec_reinit(&pvec);
912 goto get_more_pages;
913 }
914
915 /* shift unused pages over in the pvec... we
916 * will need to release them below. */
917 for (j = i; j < pvec_pages; j++) {
918 dout(" pvec leftover page %p\n",
919 pvec.pages[j]);
920 pvec.pages[j-i+first] = pvec.pages[j];
921 }
922 pvec.nr -= i-first;
923 }
924
925 /* Format the osd request message and submit the write */
926
927 offset = page_offset(pages[0]);
928 len = min(snap_size - offset,
929 (u64)locked_pages << PAGE_CACHE_SHIFT);
930 dout("writepages got %d pages at %llu~%llu\n",
931 locked_pages, offset, len);
932
933 osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0,
934 !!pool, false);
935
936 pages = NULL; /* request message now owns the pages array */
937 pool = NULL;
938
939 /* Update the write op length in case we changed it */
940
941 osd_req_op_extent_update(req, 0, len);
942
943 vino = ceph_vino(inode);
944 ceph_osdc_build_request(req, offset, snapc, vino.snap,
945 &inode->i_mtime);
946
947 rc = ceph_osdc_start_request(&fsc->client->osdc, req, true);
948 BUG_ON(rc);
949 req = NULL;
950
951 /* continue? */
952 index = next;
953 wbc->nr_to_write -= locked_pages;
954 if (wbc->nr_to_write <= 0)
955 done = 1;
956
957release_pvec_pages:
958 dout("pagevec_release on %d pages (%p)\n", (int)pvec.nr,
959 pvec.nr ? pvec.pages[0] : NULL);
960 pagevec_release(&pvec);
961
962 if (locked_pages && !done)
963 goto retry;
964 }
965
966 if (should_loop && !done) {
967 /* more to do; loop back to beginning of file */
968 dout("writepages looping back to beginning of file\n");
969 should_loop = 0;
970 index = 0;
971 goto retry;
972 }
973
974 if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
975 mapping->writeback_index = index;
976
977out:
978 if (req)
979 ceph_osdc_put_request(req);
980 ceph_put_snap_context(snapc);
981 dout("writepages done, rc = %d\n", rc);
982 return rc;
983}
984
985
986
987/*
988 * See if a given @snapc is either writeable, or already written.
989 */
990static int context_is_writeable_or_written(struct inode *inode,
991 struct ceph_snap_context *snapc)
992{
993 struct ceph_snap_context *oldest = get_oldest_context(inode, NULL);
994 int ret = !oldest || snapc->seq <= oldest->seq;
995
996 ceph_put_snap_context(oldest);
997 return ret;
998}
999
1000/*
1001 * We are only allowed to write into/dirty the page if the page is
1002 * clean, or already dirty within the same snap context.
1003 *
1004 * called with page locked.
1005 * return success with page locked,
1006 * or any failure (incl -EAGAIN) with page unlocked.
1007 */
1008static int ceph_update_writeable_page(struct file *file,
1009 loff_t pos, unsigned len,
1010 struct page *page)
1011{
1012 struct inode *inode = file_inode(file);
1013 struct ceph_inode_info *ci = ceph_inode(inode);
1014 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
1015 loff_t page_off = pos & PAGE_CACHE_MASK;
1016 int pos_in_page = pos & ~PAGE_CACHE_MASK;
1017 int end_in_page = pos_in_page + len;
1018 loff_t i_size;
1019 int r;
1020 struct ceph_snap_context *snapc, *oldest;
1021
1022retry_locked:
1023 /* writepages currently holds page lock, but if we change that later, */
1024 wait_on_page_writeback(page);
1025
1026 /* check snap context */
1027 BUG_ON(!ci->i_snap_realm);
1028 down_read(&mdsc->snap_rwsem);
1029 BUG_ON(!ci->i_snap_realm->cached_context);
1030 snapc = page_snap_context(page);
1031 if (snapc && snapc != ci->i_head_snapc) {
1032 /*
1033 * this page is already dirty in another (older) snap
1034 * context! is it writeable now?
1035 */
1036 oldest = get_oldest_context(inode, NULL);
1037 up_read(&mdsc->snap_rwsem);
1038
1039 if (snapc->seq > oldest->seq) {
1040 ceph_put_snap_context(oldest);
1041 dout(" page %p snapc %p not current or oldest\n",
1042 page, snapc);
1043 /*
1044 * queue for writeback, and wait for snapc to
1045 * be writeable or written
1046 */
1047 snapc = ceph_get_snap_context(snapc);
1048 unlock_page(page);
1049 ceph_queue_writeback(inode);
1050 r = wait_event_interruptible(ci->i_cap_wq,
1051 context_is_writeable_or_written(inode, snapc));
1052 ceph_put_snap_context(snapc);
1053 if (r == -ERESTARTSYS)
1054 return r;
1055 return -EAGAIN;
1056 }
1057 ceph_put_snap_context(oldest);
1058
1059 /* yay, writeable, do it now (without dropping page lock) */
1060 dout(" page %p snapc %p not current, but oldest\n",
1061 page, snapc);
1062 if (!clear_page_dirty_for_io(page))
1063 goto retry_locked;
1064 r = writepage_nounlock(page, NULL);
1065 if (r < 0)
1066 goto fail_nosnap;
1067 goto retry_locked;
1068 }
1069
1070 if (PageUptodate(page)) {
1071 dout(" page %p already uptodate\n", page);
1072 return 0;
1073 }
1074
1075 /* full page? */
1076 if (pos_in_page == 0 && len == PAGE_CACHE_SIZE)
1077 return 0;
1078
1079 /* past end of file? */
1080 i_size = inode->i_size; /* caller holds i_mutex */
1081
1082 if (i_size + len > inode->i_sb->s_maxbytes) {
1083 /* file is too big */
1084 r = -EINVAL;
1085 goto fail;
1086 }
1087
1088 if (page_off >= i_size ||
1089 (pos_in_page == 0 && (pos+len) >= i_size &&
1090 end_in_page - pos_in_page != PAGE_CACHE_SIZE)) {
1091 dout(" zeroing %p 0 - %d and %d - %d\n",
1092 page, pos_in_page, end_in_page, (int)PAGE_CACHE_SIZE);
1093 zero_user_segments(page,
1094 0, pos_in_page,
1095 end_in_page, PAGE_CACHE_SIZE);
1096 return 0;
1097 }
1098
1099 /* we need to read it. */
1100 up_read(&mdsc->snap_rwsem);
1101 r = readpage_nounlock(file, page);
1102 if (r < 0)
1103 goto fail_nosnap;
1104 goto retry_locked;
1105
1106fail:
1107 up_read(&mdsc->snap_rwsem);
1108fail_nosnap:
1109 unlock_page(page);
1110 return r;
1111}
1112
1113/*
1114 * We are only allowed to write into/dirty the page if the page is
1115 * clean, or already dirty within the same snap context.
1116 */
1117static int ceph_write_begin(struct file *file, struct address_space *mapping,
1118 loff_t pos, unsigned len, unsigned flags,
1119 struct page **pagep, void **fsdata)
1120{
1121 struct inode *inode = file_inode(file);
1122 struct page *page;
1123 pgoff_t index = pos >> PAGE_CACHE_SHIFT;
1124 int r;
1125
1126 do {
1127 /* get a page */
1128 page = grab_cache_page_write_begin(mapping, index, 0);
1129 if (!page)
1130 return -ENOMEM;
1131 *pagep = page;
1132
1133 dout("write_begin file %p inode %p page %p %d~%d\n", file,
1134 inode, page, (int)pos, (int)len);
1135
1136 r = ceph_update_writeable_page(file, pos, len, page);
1137 } while (r == -EAGAIN);
1138
1139 return r;
1140}
1141
1142/*
1143 * we don't do anything in here that simple_write_end doesn't do
1144 * except adjust dirty page accounting and drop read lock on
1145 * mdsc->snap_rwsem.
1146 */
1147static int ceph_write_end(struct file *file, struct address_space *mapping,
1148 loff_t pos, unsigned len, unsigned copied,
1149 struct page *page, void *fsdata)
1150{
1151 struct inode *inode = file_inode(file);
1152 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1153 struct ceph_mds_client *mdsc = fsc->mdsc;
1154 unsigned from = pos & (PAGE_CACHE_SIZE - 1);
1155 int check_cap = 0;
1156
1157 dout("write_end file %p inode %p page %p %d~%d (%d)\n", file,
1158 inode, page, (int)pos, (int)copied, (int)len);
1159
1160 /* zero the stale part of the page if we did a short copy */
1161 if (copied < len)
1162 zero_user_segment(page, from+copied, len);
1163
1164 /* did file size increase? */
1165 /* (no need for i_size_read(); we caller holds i_mutex */
1166 if (pos+copied > inode->i_size)
1167 check_cap = ceph_inode_set_size(inode, pos+copied);
1168
1169 if (!PageUptodate(page))
1170 SetPageUptodate(page);
1171
1172 set_page_dirty(page);
1173
1174 unlock_page(page);
1175 up_read(&mdsc->snap_rwsem);
1176 page_cache_release(page);
1177
1178 if (check_cap)
1179 ceph_check_caps(ceph_inode(inode), CHECK_CAPS_AUTHONLY, NULL);
1180
1181 return copied;
1182}
1183
1184/*
1185 * we set .direct_IO to indicate direct io is supported, but since we
1186 * intercept O_DIRECT reads and writes early, this function should
1187 * never get called.
1188 */
1189static ssize_t ceph_direct_io(int rw, struct kiocb *iocb,
1190 const struct iovec *iov,
1191 loff_t pos, unsigned long nr_segs)
1192{
1193 WARN_ON(1);
1194 return -EINVAL;
1195}
1196
1197const struct address_space_operations ceph_aops = {
1198 .readpage = ceph_readpage,
1199 .readpages = ceph_readpages,
1200 .writepage = ceph_writepage,
1201 .writepages = ceph_writepages_start,
1202 .write_begin = ceph_write_begin,
1203 .write_end = ceph_write_end,
1204 .set_page_dirty = ceph_set_page_dirty,
1205 .invalidatepage = ceph_invalidatepage,
1206 .releasepage = ceph_releasepage,
1207 .direct_IO = ceph_direct_io,
1208};
1209
1210
1211/*
1212 * vm ops
1213 */
1214static int ceph_filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1215{
1216 struct inode *inode = file_inode(vma->vm_file);
1217 struct ceph_inode_info *ci = ceph_inode(inode);
1218 struct ceph_file_info *fi = vma->vm_file->private_data;
1219 loff_t off = vmf->pgoff << PAGE_CACHE_SHIFT;
1220 int want, got, ret;
1221
1222 dout("filemap_fault %p %llx.%llx %llu~%zd trying to get caps\n",
1223 inode, ceph_vinop(inode), off, (size_t)PAGE_CACHE_SIZE);
1224 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1225 want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
1226 else
1227 want = CEPH_CAP_FILE_CACHE;
1228 while (1) {
1229 got = 0;
1230 ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, &got, -1);
1231 if (ret == 0)
1232 break;
1233 if (ret != -ERESTARTSYS) {
1234 WARN_ON(1);
1235 return VM_FAULT_SIGBUS;
1236 }
1237 }
1238 dout("filemap_fault %p %llu~%zd got cap refs on %s\n",
1239 inode, off, (size_t)PAGE_CACHE_SIZE, ceph_cap_string(got));
1240
1241 ret = filemap_fault(vma, vmf);
1242
1243 dout("filemap_fault %p %llu~%zd dropping cap refs on %s ret %d\n",
1244 inode, off, (size_t)PAGE_CACHE_SIZE, ceph_cap_string(got), ret);
1245 ceph_put_cap_refs(ci, got);
1246
1247 return ret;
1248}
1249
1250/*
1251 * Reuse write_begin here for simplicity.
1252 */
1253static int ceph_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
1254{
1255 struct inode *inode = file_inode(vma->vm_file);
1256 struct ceph_inode_info *ci = ceph_inode(inode);
1257 struct ceph_file_info *fi = vma->vm_file->private_data;
1258 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
1259 struct page *page = vmf->page;
1260 loff_t off = page_offset(page);
1261 loff_t size = i_size_read(inode);
1262 size_t len;
1263 int want, got, ret;
1264
1265 if (off + PAGE_CACHE_SIZE <= size)
1266 len = PAGE_CACHE_SIZE;
1267 else
1268 len = size & ~PAGE_CACHE_MASK;
1269
1270 dout("page_mkwrite %p %llx.%llx %llu~%zd getting caps i_size %llu\n",
1271 inode, ceph_vinop(inode), off, len, size);
1272 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1273 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
1274 else
1275 want = CEPH_CAP_FILE_BUFFER;
1276 while (1) {
1277 got = 0;
1278 ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, &got, off + len);
1279 if (ret == 0)
1280 break;
1281 if (ret != -ERESTARTSYS) {
1282 WARN_ON(1);
1283 return VM_FAULT_SIGBUS;
1284 }
1285 }
1286 dout("page_mkwrite %p %llu~%zd got cap refs on %s\n",
1287 inode, off, len, ceph_cap_string(got));
1288
1289 /* Update time before taking page lock */
1290 file_update_time(vma->vm_file);
1291
1292 lock_page(page);
1293
1294 ret = VM_FAULT_NOPAGE;
1295 if ((off > size) ||
1296 (page->mapping != inode->i_mapping))
1297 goto out;
1298
1299 ret = ceph_update_writeable_page(vma->vm_file, off, len, page);
1300 if (ret == 0) {
1301 /* success. we'll keep the page locked. */
1302 set_page_dirty(page);
1303 up_read(&mdsc->snap_rwsem);
1304 ret = VM_FAULT_LOCKED;
1305 } else {
1306 if (ret == -ENOMEM)
1307 ret = VM_FAULT_OOM;
1308 else
1309 ret = VM_FAULT_SIGBUS;
1310 }
1311out:
1312 if (ret != VM_FAULT_LOCKED) {
1313 unlock_page(page);
1314 } else {
1315 int dirty;
1316 spin_lock(&ci->i_ceph_lock);
1317 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR);
1318 spin_unlock(&ci->i_ceph_lock);
1319 if (dirty)
1320 __mark_inode_dirty(inode, dirty);
1321 }
1322
1323 dout("page_mkwrite %p %llu~%zd dropping cap refs on %s ret %d\n",
1324 inode, off, len, ceph_cap_string(got), ret);
1325 ceph_put_cap_refs(ci, got);
1326
1327 return ret;
1328}
1329
1330static struct vm_operations_struct ceph_vmops = {
1331 .fault = ceph_filemap_fault,
1332 .page_mkwrite = ceph_page_mkwrite,
1333 .remap_pages = generic_file_remap_pages,
1334};
1335
1336int ceph_mmap(struct file *file, struct vm_area_struct *vma)
1337{
1338 struct address_space *mapping = file->f_mapping;
1339
1340 if (!mapping->a_ops->readpage)
1341 return -ENOEXEC;
1342 file_accessed(file);
1343 vma->vm_ops = &ceph_vmops;
1344 return 0;
1345}
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/swap.h>
8#include <linux/pagemap.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#include <linux/iversion.h>
14#include <linux/ktime.h>
15#include <linux/netfs.h>
16
17#include "super.h"
18#include "mds_client.h"
19#include "cache.h"
20#include "metric.h"
21#include <linux/ceph/osd_client.h>
22#include <linux/ceph/striper.h>
23
24/*
25 * Ceph address space ops.
26 *
27 * There are a few funny things going on here.
28 *
29 * The page->private field is used to reference a struct
30 * ceph_snap_context for _every_ dirty page. This indicates which
31 * snapshot the page was logically dirtied in, and thus which snap
32 * context needs to be associated with the osd write during writeback.
33 *
34 * Similarly, struct ceph_inode_info maintains a set of counters to
35 * count dirty pages on the inode. In the absence of snapshots,
36 * i_wrbuffer_ref == i_wrbuffer_ref_head == the dirty page count.
37 *
38 * When a snapshot is taken (that is, when the client receives
39 * notification that a snapshot was taken), each inode with caps and
40 * with dirty pages (dirty pages implies there is a cap) gets a new
41 * ceph_cap_snap in the i_cap_snaps list (which is sorted in ascending
42 * order, new snaps go to the tail). The i_wrbuffer_ref_head count is
43 * moved to capsnap->dirty. (Unless a sync write is currently in
44 * progress. In that case, the capsnap is said to be "pending", new
45 * writes cannot start, and the capsnap isn't "finalized" until the
46 * write completes (or fails) and a final size/mtime for the inode for
47 * that snap can be settled upon.) i_wrbuffer_ref_head is reset to 0.
48 *
49 * On writeback, we must submit writes to the osd IN SNAP ORDER. So,
50 * we look for the first capsnap in i_cap_snaps and write out pages in
51 * that snap context _only_. Then we move on to the next capsnap,
52 * eventually reaching the "live" or "head" context (i.e., pages that
53 * are not yet snapped) and are writing the most recently dirtied
54 * pages.
55 *
56 * Invalidate and so forth must take care to ensure the dirty page
57 * accounting is preserved.
58 */
59
60#define CONGESTION_ON_THRESH(congestion_kb) (congestion_kb >> (PAGE_SHIFT-10))
61#define CONGESTION_OFF_THRESH(congestion_kb) \
62 (CONGESTION_ON_THRESH(congestion_kb) - \
63 (CONGESTION_ON_THRESH(congestion_kb) >> 2))
64
65static int ceph_netfs_check_write_begin(struct file *file, loff_t pos, unsigned int len,
66 struct folio **foliop, void **_fsdata);
67
68static inline struct ceph_snap_context *page_snap_context(struct page *page)
69{
70 if (PagePrivate(page))
71 return (void *)page->private;
72 return NULL;
73}
74
75/*
76 * Dirty a page. Optimistically adjust accounting, on the assumption
77 * that we won't race with invalidate. If we do, readjust.
78 */
79static bool ceph_dirty_folio(struct address_space *mapping, struct folio *folio)
80{
81 struct inode *inode;
82 struct ceph_inode_info *ci;
83 struct ceph_snap_context *snapc;
84
85 if (folio_test_dirty(folio)) {
86 dout("%p dirty_folio %p idx %lu -- already dirty\n",
87 mapping->host, folio, folio->index);
88 VM_BUG_ON_FOLIO(!folio_test_private(folio), folio);
89 return false;
90 }
91
92 inode = mapping->host;
93 ci = ceph_inode(inode);
94
95 /* dirty the head */
96 spin_lock(&ci->i_ceph_lock);
97 BUG_ON(ci->i_wr_ref == 0); // caller should hold Fw reference
98 if (__ceph_have_pending_cap_snap(ci)) {
99 struct ceph_cap_snap *capsnap =
100 list_last_entry(&ci->i_cap_snaps,
101 struct ceph_cap_snap,
102 ci_item);
103 snapc = ceph_get_snap_context(capsnap->context);
104 capsnap->dirty_pages++;
105 } else {
106 BUG_ON(!ci->i_head_snapc);
107 snapc = ceph_get_snap_context(ci->i_head_snapc);
108 ++ci->i_wrbuffer_ref_head;
109 }
110 if (ci->i_wrbuffer_ref == 0)
111 ihold(inode);
112 ++ci->i_wrbuffer_ref;
113 dout("%p dirty_folio %p idx %lu head %d/%d -> %d/%d "
114 "snapc %p seq %lld (%d snaps)\n",
115 mapping->host, folio, folio->index,
116 ci->i_wrbuffer_ref-1, ci->i_wrbuffer_ref_head-1,
117 ci->i_wrbuffer_ref, ci->i_wrbuffer_ref_head,
118 snapc, snapc->seq, snapc->num_snaps);
119 spin_unlock(&ci->i_ceph_lock);
120
121 /*
122 * Reference snap context in folio->private. Also set
123 * PagePrivate so that we get invalidate_folio callback.
124 */
125 VM_WARN_ON_FOLIO(folio->private, folio);
126 folio_attach_private(folio, snapc);
127
128 return ceph_fscache_dirty_folio(mapping, folio);
129}
130
131/*
132 * If we are truncating the full folio (i.e. offset == 0), adjust the
133 * dirty folio counters appropriately. Only called if there is private
134 * data on the folio.
135 */
136static void ceph_invalidate_folio(struct folio *folio, size_t offset,
137 size_t length)
138{
139 struct inode *inode;
140 struct ceph_inode_info *ci;
141 struct ceph_snap_context *snapc;
142
143 inode = folio->mapping->host;
144 ci = ceph_inode(inode);
145
146 if (offset != 0 || length != folio_size(folio)) {
147 dout("%p invalidate_folio idx %lu partial dirty page %zu~%zu\n",
148 inode, folio->index, offset, length);
149 return;
150 }
151
152 WARN_ON(!folio_test_locked(folio));
153 if (folio_test_private(folio)) {
154 dout("%p invalidate_folio idx %lu full dirty page\n",
155 inode, folio->index);
156
157 snapc = folio_detach_private(folio);
158 ceph_put_wrbuffer_cap_refs(ci, 1, snapc);
159 ceph_put_snap_context(snapc);
160 }
161
162 folio_wait_fscache(folio);
163}
164
165static bool ceph_release_folio(struct folio *folio, gfp_t gfp)
166{
167 struct inode *inode = folio->mapping->host;
168
169 dout("%llx:%llx release_folio idx %lu (%sdirty)\n",
170 ceph_vinop(inode),
171 folio->index, folio_test_dirty(folio) ? "" : "not ");
172
173 if (folio_test_private(folio))
174 return false;
175
176 if (folio_test_fscache(folio)) {
177 if (current_is_kswapd() || !(gfp & __GFP_FS))
178 return false;
179 folio_wait_fscache(folio);
180 }
181 ceph_fscache_note_page_release(inode);
182 return true;
183}
184
185static void ceph_netfs_expand_readahead(struct netfs_io_request *rreq)
186{
187 struct inode *inode = rreq->inode;
188 struct ceph_inode_info *ci = ceph_inode(inode);
189 struct ceph_file_layout *lo = &ci->i_layout;
190 u32 blockoff;
191 u64 blockno;
192
193 /* Expand the start downward */
194 blockno = div_u64_rem(rreq->start, lo->stripe_unit, &blockoff);
195 rreq->start = blockno * lo->stripe_unit;
196 rreq->len += blockoff;
197
198 /* Now, round up the length to the next block */
199 rreq->len = roundup(rreq->len, lo->stripe_unit);
200}
201
202static bool ceph_netfs_clamp_length(struct netfs_io_subrequest *subreq)
203{
204 struct inode *inode = subreq->rreq->inode;
205 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
206 struct ceph_inode_info *ci = ceph_inode(inode);
207 u64 objno, objoff;
208 u32 xlen;
209
210 /* Truncate the extent at the end of the current block */
211 ceph_calc_file_object_mapping(&ci->i_layout, subreq->start, subreq->len,
212 &objno, &objoff, &xlen);
213 subreq->len = min(xlen, fsc->mount_options->rsize);
214 return true;
215}
216
217static void finish_netfs_read(struct ceph_osd_request *req)
218{
219 struct ceph_fs_client *fsc = ceph_inode_to_client(req->r_inode);
220 struct ceph_osd_data *osd_data = osd_req_op_extent_osd_data(req, 0);
221 struct netfs_io_subrequest *subreq = req->r_priv;
222 int num_pages;
223 int err = req->r_result;
224
225 ceph_update_read_metrics(&fsc->mdsc->metric, req->r_start_latency,
226 req->r_end_latency, osd_data->length, err);
227
228 dout("%s: result %d subreq->len=%zu i_size=%lld\n", __func__, req->r_result,
229 subreq->len, i_size_read(req->r_inode));
230
231 /* no object means success but no data */
232 if (err == -ENOENT)
233 err = 0;
234 else if (err == -EBLOCKLISTED)
235 fsc->blocklisted = true;
236
237 if (err >= 0 && err < subreq->len)
238 __set_bit(NETFS_SREQ_CLEAR_TAIL, &subreq->flags);
239
240 netfs_subreq_terminated(subreq, err, false);
241
242 num_pages = calc_pages_for(osd_data->alignment, osd_data->length);
243 ceph_put_page_vector(osd_data->pages, num_pages, false);
244 iput(req->r_inode);
245}
246
247static bool ceph_netfs_issue_op_inline(struct netfs_io_subrequest *subreq)
248{
249 struct netfs_io_request *rreq = subreq->rreq;
250 struct inode *inode = rreq->inode;
251 struct ceph_mds_reply_info_parsed *rinfo;
252 struct ceph_mds_reply_info_in *iinfo;
253 struct ceph_mds_request *req;
254 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
255 struct ceph_inode_info *ci = ceph_inode(inode);
256 struct iov_iter iter;
257 ssize_t err = 0;
258 size_t len;
259 int mode;
260
261 __set_bit(NETFS_SREQ_CLEAR_TAIL, &subreq->flags);
262 __clear_bit(NETFS_SREQ_COPY_TO_CACHE, &subreq->flags);
263
264 if (subreq->start >= inode->i_size)
265 goto out;
266
267 /* We need to fetch the inline data. */
268 mode = ceph_try_to_choose_auth_mds(inode, CEPH_STAT_CAP_INLINE_DATA);
269 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, mode);
270 if (IS_ERR(req)) {
271 err = PTR_ERR(req);
272 goto out;
273 }
274 req->r_ino1 = ci->i_vino;
275 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INLINE_DATA);
276 req->r_num_caps = 2;
277
278 err = ceph_mdsc_do_request(mdsc, NULL, req);
279 if (err < 0)
280 goto out;
281
282 rinfo = &req->r_reply_info;
283 iinfo = &rinfo->targeti;
284 if (iinfo->inline_version == CEPH_INLINE_NONE) {
285 /* The data got uninlined */
286 ceph_mdsc_put_request(req);
287 return false;
288 }
289
290 len = min_t(size_t, iinfo->inline_len - subreq->start, subreq->len);
291 iov_iter_xarray(&iter, ITER_DEST, &rreq->mapping->i_pages, subreq->start, len);
292 err = copy_to_iter(iinfo->inline_data + subreq->start, len, &iter);
293 if (err == 0)
294 err = -EFAULT;
295
296 ceph_mdsc_put_request(req);
297out:
298 netfs_subreq_terminated(subreq, err, false);
299 return true;
300}
301
302static void ceph_netfs_issue_read(struct netfs_io_subrequest *subreq)
303{
304 struct netfs_io_request *rreq = subreq->rreq;
305 struct inode *inode = rreq->inode;
306 struct ceph_inode_info *ci = ceph_inode(inode);
307 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
308 struct ceph_osd_request *req = NULL;
309 struct ceph_vino vino = ceph_vino(inode);
310 struct iov_iter iter;
311 struct page **pages;
312 size_t page_off;
313 int err = 0;
314 u64 len = subreq->len;
315
316 if (ceph_inode_is_shutdown(inode)) {
317 err = -EIO;
318 goto out;
319 }
320
321 if (ceph_has_inline_data(ci) && ceph_netfs_issue_op_inline(subreq))
322 return;
323
324 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, vino, subreq->start, &len,
325 0, 1, CEPH_OSD_OP_READ,
326 CEPH_OSD_FLAG_READ | fsc->client->osdc.client->options->read_from_replica,
327 NULL, ci->i_truncate_seq, ci->i_truncate_size, false);
328 if (IS_ERR(req)) {
329 err = PTR_ERR(req);
330 req = NULL;
331 goto out;
332 }
333
334 dout("%s: pos=%llu orig_len=%zu len=%llu\n", __func__, subreq->start, subreq->len, len);
335 iov_iter_xarray(&iter, ITER_DEST, &rreq->mapping->i_pages, subreq->start, len);
336 err = iov_iter_get_pages_alloc2(&iter, &pages, len, &page_off);
337 if (err < 0) {
338 dout("%s: iov_ter_get_pages_alloc returned %d\n", __func__, err);
339 goto out;
340 }
341
342 /* should always give us a page-aligned read */
343 WARN_ON_ONCE(page_off);
344 len = err;
345 err = 0;
346
347 osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0, false, false);
348 req->r_callback = finish_netfs_read;
349 req->r_priv = subreq;
350 req->r_inode = inode;
351 ihold(inode);
352
353 ceph_osdc_start_request(req->r_osdc, req);
354out:
355 ceph_osdc_put_request(req);
356 if (err)
357 netfs_subreq_terminated(subreq, err, false);
358 dout("%s: result %d\n", __func__, err);
359}
360
361static int ceph_init_request(struct netfs_io_request *rreq, struct file *file)
362{
363 struct inode *inode = rreq->inode;
364 int got = 0, want = CEPH_CAP_FILE_CACHE;
365 int ret = 0;
366
367 if (rreq->origin != NETFS_READAHEAD)
368 return 0;
369
370 if (file) {
371 struct ceph_rw_context *rw_ctx;
372 struct ceph_file_info *fi = file->private_data;
373
374 rw_ctx = ceph_find_rw_context(fi);
375 if (rw_ctx)
376 return 0;
377 }
378
379 /*
380 * readahead callers do not necessarily hold Fcb caps
381 * (e.g. fadvise, madvise).
382 */
383 ret = ceph_try_get_caps(inode, CEPH_CAP_FILE_RD, want, true, &got);
384 if (ret < 0) {
385 dout("start_read %p, error getting cap\n", inode);
386 return ret;
387 }
388
389 if (!(got & want)) {
390 dout("start_read %p, no cache cap\n", inode);
391 return -EACCES;
392 }
393 if (ret == 0)
394 return -EACCES;
395
396 rreq->netfs_priv = (void *)(uintptr_t)got;
397 return 0;
398}
399
400static void ceph_netfs_free_request(struct netfs_io_request *rreq)
401{
402 struct ceph_inode_info *ci = ceph_inode(rreq->inode);
403 int got = (uintptr_t)rreq->netfs_priv;
404
405 if (got)
406 ceph_put_cap_refs(ci, got);
407}
408
409const struct netfs_request_ops ceph_netfs_ops = {
410 .init_request = ceph_init_request,
411 .free_request = ceph_netfs_free_request,
412 .begin_cache_operation = ceph_begin_cache_operation,
413 .issue_read = ceph_netfs_issue_read,
414 .expand_readahead = ceph_netfs_expand_readahead,
415 .clamp_length = ceph_netfs_clamp_length,
416 .check_write_begin = ceph_netfs_check_write_begin,
417};
418
419#ifdef CONFIG_CEPH_FSCACHE
420static void ceph_set_page_fscache(struct page *page)
421{
422 set_page_fscache(page);
423}
424
425static void ceph_fscache_write_terminated(void *priv, ssize_t error, bool was_async)
426{
427 struct inode *inode = priv;
428
429 if (IS_ERR_VALUE(error) && error != -ENOBUFS)
430 ceph_fscache_invalidate(inode, false);
431}
432
433static void ceph_fscache_write_to_cache(struct inode *inode, u64 off, u64 len, bool caching)
434{
435 struct ceph_inode_info *ci = ceph_inode(inode);
436 struct fscache_cookie *cookie = ceph_fscache_cookie(ci);
437
438 fscache_write_to_cache(cookie, inode->i_mapping, off, len, i_size_read(inode),
439 ceph_fscache_write_terminated, inode, caching);
440}
441#else
442static inline void ceph_set_page_fscache(struct page *page)
443{
444}
445
446static inline void ceph_fscache_write_to_cache(struct inode *inode, u64 off, u64 len, bool caching)
447{
448}
449#endif /* CONFIG_CEPH_FSCACHE */
450
451struct ceph_writeback_ctl
452{
453 loff_t i_size;
454 u64 truncate_size;
455 u32 truncate_seq;
456 bool size_stable;
457 bool head_snapc;
458};
459
460/*
461 * Get ref for the oldest snapc for an inode with dirty data... that is, the
462 * only snap context we are allowed to write back.
463 */
464static struct ceph_snap_context *
465get_oldest_context(struct inode *inode, struct ceph_writeback_ctl *ctl,
466 struct ceph_snap_context *page_snapc)
467{
468 struct ceph_inode_info *ci = ceph_inode(inode);
469 struct ceph_snap_context *snapc = NULL;
470 struct ceph_cap_snap *capsnap = NULL;
471
472 spin_lock(&ci->i_ceph_lock);
473 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
474 dout(" cap_snap %p snapc %p has %d dirty pages\n", capsnap,
475 capsnap->context, capsnap->dirty_pages);
476 if (!capsnap->dirty_pages)
477 continue;
478
479 /* get i_size, truncate_{seq,size} for page_snapc? */
480 if (snapc && capsnap->context != page_snapc)
481 continue;
482
483 if (ctl) {
484 if (capsnap->writing) {
485 ctl->i_size = i_size_read(inode);
486 ctl->size_stable = false;
487 } else {
488 ctl->i_size = capsnap->size;
489 ctl->size_stable = true;
490 }
491 ctl->truncate_size = capsnap->truncate_size;
492 ctl->truncate_seq = capsnap->truncate_seq;
493 ctl->head_snapc = false;
494 }
495
496 if (snapc)
497 break;
498
499 snapc = ceph_get_snap_context(capsnap->context);
500 if (!page_snapc ||
501 page_snapc == snapc ||
502 page_snapc->seq > snapc->seq)
503 break;
504 }
505 if (!snapc && ci->i_wrbuffer_ref_head) {
506 snapc = ceph_get_snap_context(ci->i_head_snapc);
507 dout(" head snapc %p has %d dirty pages\n",
508 snapc, ci->i_wrbuffer_ref_head);
509 if (ctl) {
510 ctl->i_size = i_size_read(inode);
511 ctl->truncate_size = ci->i_truncate_size;
512 ctl->truncate_seq = ci->i_truncate_seq;
513 ctl->size_stable = false;
514 ctl->head_snapc = true;
515 }
516 }
517 spin_unlock(&ci->i_ceph_lock);
518 return snapc;
519}
520
521static u64 get_writepages_data_length(struct inode *inode,
522 struct page *page, u64 start)
523{
524 struct ceph_inode_info *ci = ceph_inode(inode);
525 struct ceph_snap_context *snapc = page_snap_context(page);
526 struct ceph_cap_snap *capsnap = NULL;
527 u64 end = i_size_read(inode);
528
529 if (snapc != ci->i_head_snapc) {
530 bool found = false;
531 spin_lock(&ci->i_ceph_lock);
532 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
533 if (capsnap->context == snapc) {
534 if (!capsnap->writing)
535 end = capsnap->size;
536 found = true;
537 break;
538 }
539 }
540 spin_unlock(&ci->i_ceph_lock);
541 WARN_ON(!found);
542 }
543 if (end > page_offset(page) + thp_size(page))
544 end = page_offset(page) + thp_size(page);
545 return end > start ? end - start : 0;
546}
547
548/*
549 * Write a single page, but leave the page locked.
550 *
551 * If we get a write error, mark the mapping for error, but still adjust the
552 * dirty page accounting (i.e., page is no longer dirty).
553 */
554static int writepage_nounlock(struct page *page, struct writeback_control *wbc)
555{
556 struct folio *folio = page_folio(page);
557 struct inode *inode = page->mapping->host;
558 struct ceph_inode_info *ci = ceph_inode(inode);
559 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
560 struct ceph_snap_context *snapc, *oldest;
561 loff_t page_off = page_offset(page);
562 int err;
563 loff_t len = thp_size(page);
564 struct ceph_writeback_ctl ceph_wbc;
565 struct ceph_osd_client *osdc = &fsc->client->osdc;
566 struct ceph_osd_request *req;
567 bool caching = ceph_is_cache_enabled(inode);
568
569 dout("writepage %p idx %lu\n", page, page->index);
570
571 if (ceph_inode_is_shutdown(inode))
572 return -EIO;
573
574 /* verify this is a writeable snap context */
575 snapc = page_snap_context(page);
576 if (!snapc) {
577 dout("writepage %p page %p not dirty?\n", inode, page);
578 return 0;
579 }
580 oldest = get_oldest_context(inode, &ceph_wbc, snapc);
581 if (snapc->seq > oldest->seq) {
582 dout("writepage %p page %p snapc %p not writeable - noop\n",
583 inode, page, snapc);
584 /* we should only noop if called by kswapd */
585 WARN_ON(!(current->flags & PF_MEMALLOC));
586 ceph_put_snap_context(oldest);
587 redirty_page_for_writepage(wbc, page);
588 return 0;
589 }
590 ceph_put_snap_context(oldest);
591
592 /* is this a partial page at end of file? */
593 if (page_off >= ceph_wbc.i_size) {
594 dout("folio at %lu beyond eof %llu\n", folio->index,
595 ceph_wbc.i_size);
596 folio_invalidate(folio, 0, folio_size(folio));
597 return 0;
598 }
599
600 if (ceph_wbc.i_size < page_off + len)
601 len = ceph_wbc.i_size - page_off;
602
603 dout("writepage %p page %p index %lu on %llu~%llu snapc %p seq %lld\n",
604 inode, page, page->index, page_off, len, snapc, snapc->seq);
605
606 if (atomic_long_inc_return(&fsc->writeback_count) >
607 CONGESTION_ON_THRESH(fsc->mount_options->congestion_kb))
608 fsc->write_congested = true;
609
610 req = ceph_osdc_new_request(osdc, &ci->i_layout, ceph_vino(inode), page_off, &len, 0, 1,
611 CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE, snapc,
612 ceph_wbc.truncate_seq, ceph_wbc.truncate_size,
613 true);
614 if (IS_ERR(req)) {
615 redirty_page_for_writepage(wbc, page);
616 return PTR_ERR(req);
617 }
618
619 set_page_writeback(page);
620 if (caching)
621 ceph_set_page_fscache(page);
622 ceph_fscache_write_to_cache(inode, page_off, len, caching);
623
624 /* it may be a short write due to an object boundary */
625 WARN_ON_ONCE(len > thp_size(page));
626 osd_req_op_extent_osd_data_pages(req, 0, &page, len, 0, false, false);
627 dout("writepage %llu~%llu (%llu bytes)\n", page_off, len, len);
628
629 req->r_mtime = inode->i_mtime;
630 ceph_osdc_start_request(osdc, req);
631 err = ceph_osdc_wait_request(osdc, req);
632
633 ceph_update_write_metrics(&fsc->mdsc->metric, req->r_start_latency,
634 req->r_end_latency, len, err);
635
636 ceph_osdc_put_request(req);
637 if (err == 0)
638 err = len;
639
640 if (err < 0) {
641 struct writeback_control tmp_wbc;
642 if (!wbc)
643 wbc = &tmp_wbc;
644 if (err == -ERESTARTSYS) {
645 /* killed by SIGKILL */
646 dout("writepage interrupted page %p\n", page);
647 redirty_page_for_writepage(wbc, page);
648 end_page_writeback(page);
649 return err;
650 }
651 if (err == -EBLOCKLISTED)
652 fsc->blocklisted = true;
653 dout("writepage setting page/mapping error %d %p\n",
654 err, page);
655 mapping_set_error(&inode->i_data, err);
656 wbc->pages_skipped++;
657 } else {
658 dout("writepage cleaned page %p\n", page);
659 err = 0; /* vfs expects us to return 0 */
660 }
661 oldest = detach_page_private(page);
662 WARN_ON_ONCE(oldest != snapc);
663 end_page_writeback(page);
664 ceph_put_wrbuffer_cap_refs(ci, 1, snapc);
665 ceph_put_snap_context(snapc); /* page's reference */
666
667 if (atomic_long_dec_return(&fsc->writeback_count) <
668 CONGESTION_OFF_THRESH(fsc->mount_options->congestion_kb))
669 fsc->write_congested = false;
670
671 return err;
672}
673
674static int ceph_writepage(struct page *page, struct writeback_control *wbc)
675{
676 int err;
677 struct inode *inode = page->mapping->host;
678 BUG_ON(!inode);
679 ihold(inode);
680
681 if (wbc->sync_mode == WB_SYNC_NONE &&
682 ceph_inode_to_client(inode)->write_congested)
683 return AOP_WRITEPAGE_ACTIVATE;
684
685 wait_on_page_fscache(page);
686
687 err = writepage_nounlock(page, wbc);
688 if (err == -ERESTARTSYS) {
689 /* direct memory reclaimer was killed by SIGKILL. return 0
690 * to prevent caller from setting mapping/page error */
691 err = 0;
692 }
693 unlock_page(page);
694 iput(inode);
695 return err;
696}
697
698/*
699 * async writeback completion handler.
700 *
701 * If we get an error, set the mapping error bit, but not the individual
702 * page error bits.
703 */
704static void writepages_finish(struct ceph_osd_request *req)
705{
706 struct inode *inode = req->r_inode;
707 struct ceph_inode_info *ci = ceph_inode(inode);
708 struct ceph_osd_data *osd_data;
709 struct page *page;
710 int num_pages, total_pages = 0;
711 int i, j;
712 int rc = req->r_result;
713 struct ceph_snap_context *snapc = req->r_snapc;
714 struct address_space *mapping = inode->i_mapping;
715 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
716 unsigned int len = 0;
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 if (rc == -EBLOCKLISTED)
724 fsc->blocklisted = true;
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 pr_warn("%s incorrect op %d req %p index %d tid %llu\n",
742 __func__, req->r_ops[i].op, req, i, req->r_tid);
743 break;
744 }
745
746 osd_data = osd_req_op_extent_osd_data(req, i);
747 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES);
748 len += osd_data->length;
749 num_pages = calc_pages_for((u64)osd_data->alignment,
750 (u64)osd_data->length);
751 total_pages += num_pages;
752 for (j = 0; j < num_pages; j++) {
753 page = osd_data->pages[j];
754 BUG_ON(!page);
755 WARN_ON(!PageUptodate(page));
756
757 if (atomic_long_dec_return(&fsc->writeback_count) <
758 CONGESTION_OFF_THRESH(
759 fsc->mount_options->congestion_kb))
760 fsc->write_congested = false;
761
762 ceph_put_snap_context(detach_page_private(page));
763 end_page_writeback(page);
764 dout("unlocking %p\n", page);
765
766 if (remove_page)
767 generic_error_remove_page(inode->i_mapping,
768 page);
769
770 unlock_page(page);
771 }
772 dout("writepages_finish %p wrote %llu bytes cleaned %d pages\n",
773 inode, osd_data->length, rc >= 0 ? num_pages : 0);
774
775 release_pages(osd_data->pages, num_pages);
776 }
777
778 ceph_update_write_metrics(&fsc->mdsc->metric, req->r_start_latency,
779 req->r_end_latency, len, rc);
780
781 ceph_put_wrbuffer_cap_refs(ci, total_pages, snapc);
782
783 osd_data = osd_req_op_extent_osd_data(req, 0);
784 if (osd_data->pages_from_pool)
785 mempool_free(osd_data->pages, ceph_wb_pagevec_pool);
786 else
787 kfree(osd_data->pages);
788 ceph_osdc_put_request(req);
789}
790
791/*
792 * initiate async writeback
793 */
794static int ceph_writepages_start(struct address_space *mapping,
795 struct writeback_control *wbc)
796{
797 struct inode *inode = mapping->host;
798 struct ceph_inode_info *ci = ceph_inode(inode);
799 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
800 struct ceph_vino vino = ceph_vino(inode);
801 pgoff_t index, start_index, end = -1;
802 struct ceph_snap_context *snapc = NULL, *last_snapc = NULL, *pgsnapc;
803 struct pagevec pvec;
804 int rc = 0;
805 unsigned int wsize = i_blocksize(inode);
806 struct ceph_osd_request *req = NULL;
807 struct ceph_writeback_ctl ceph_wbc;
808 bool should_loop, range_whole = false;
809 bool done = false;
810 bool caching = ceph_is_cache_enabled(inode);
811
812 if (wbc->sync_mode == WB_SYNC_NONE &&
813 fsc->write_congested)
814 return 0;
815
816 dout("writepages_start %p (mode=%s)\n", inode,
817 wbc->sync_mode == WB_SYNC_NONE ? "NONE" :
818 (wbc->sync_mode == WB_SYNC_ALL ? "ALL" : "HOLD"));
819
820 if (ceph_inode_is_shutdown(inode)) {
821 if (ci->i_wrbuffer_ref > 0) {
822 pr_warn_ratelimited(
823 "writepage_start %p %lld forced umount\n",
824 inode, ceph_ino(inode));
825 }
826 mapping_set_error(mapping, -EIO);
827 return -EIO; /* we're in a forced umount, don't write! */
828 }
829 if (fsc->mount_options->wsize < wsize)
830 wsize = fsc->mount_options->wsize;
831
832 pagevec_init(&pvec);
833
834 start_index = wbc->range_cyclic ? mapping->writeback_index : 0;
835 index = start_index;
836
837retry:
838 /* find oldest snap context with dirty data */
839 snapc = get_oldest_context(inode, &ceph_wbc, NULL);
840 if (!snapc) {
841 /* hmm, why does writepages get called when there
842 is no dirty data? */
843 dout(" no snap context with dirty data?\n");
844 goto out;
845 }
846 dout(" oldest snapc is %p seq %lld (%d snaps)\n",
847 snapc, snapc->seq, snapc->num_snaps);
848
849 should_loop = false;
850 if (ceph_wbc.head_snapc && snapc != last_snapc) {
851 /* where to start/end? */
852 if (wbc->range_cyclic) {
853 index = start_index;
854 end = -1;
855 if (index > 0)
856 should_loop = true;
857 dout(" cyclic, start at %lu\n", index);
858 } else {
859 index = wbc->range_start >> PAGE_SHIFT;
860 end = wbc->range_end >> PAGE_SHIFT;
861 if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
862 range_whole = true;
863 dout(" not cyclic, %lu to %lu\n", index, end);
864 }
865 } else if (!ceph_wbc.head_snapc) {
866 /* Do not respect wbc->range_{start,end}. Dirty pages
867 * in that range can be associated with newer snapc.
868 * They are not writeable until we write all dirty pages
869 * associated with 'snapc' get written */
870 if (index > 0)
871 should_loop = true;
872 dout(" non-head snapc, range whole\n");
873 }
874
875 ceph_put_snap_context(last_snapc);
876 last_snapc = snapc;
877
878 while (!done && index <= end) {
879 int num_ops = 0, op_idx;
880 unsigned i, pvec_pages, max_pages, locked_pages = 0;
881 struct page **pages = NULL, **data_pages;
882 struct page *page;
883 pgoff_t strip_unit_end = 0;
884 u64 offset = 0, len = 0;
885 bool from_pool = false;
886
887 max_pages = wsize >> PAGE_SHIFT;
888
889get_more_pages:
890 pvec_pages = pagevec_lookup_range_tag(&pvec, mapping, &index,
891 end, PAGECACHE_TAG_DIRTY);
892 dout("pagevec_lookup_range_tag got %d\n", pvec_pages);
893 if (!pvec_pages && !locked_pages)
894 break;
895 for (i = 0; i < pvec_pages && locked_pages < max_pages; i++) {
896 page = pvec.pages[i];
897 dout("? %p idx %lu\n", page, page->index);
898 if (locked_pages == 0)
899 lock_page(page); /* first page */
900 else if (!trylock_page(page))
901 break;
902
903 /* only dirty pages, or our accounting breaks */
904 if (unlikely(!PageDirty(page)) ||
905 unlikely(page->mapping != mapping)) {
906 dout("!dirty or !mapping %p\n", page);
907 unlock_page(page);
908 continue;
909 }
910 /* only if matching snap context */
911 pgsnapc = page_snap_context(page);
912 if (pgsnapc != snapc) {
913 dout("page snapc %p %lld != oldest %p %lld\n",
914 pgsnapc, pgsnapc->seq, snapc, snapc->seq);
915 if (!should_loop &&
916 !ceph_wbc.head_snapc &&
917 wbc->sync_mode != WB_SYNC_NONE)
918 should_loop = true;
919 unlock_page(page);
920 continue;
921 }
922 if (page_offset(page) >= ceph_wbc.i_size) {
923 struct folio *folio = page_folio(page);
924
925 dout("folio at %lu beyond eof %llu\n",
926 folio->index, ceph_wbc.i_size);
927 if ((ceph_wbc.size_stable ||
928 folio_pos(folio) >= i_size_read(inode)) &&
929 folio_clear_dirty_for_io(folio))
930 folio_invalidate(folio, 0,
931 folio_size(folio));
932 folio_unlock(folio);
933 continue;
934 }
935 if (strip_unit_end && (page->index > strip_unit_end)) {
936 dout("end of strip unit %p\n", page);
937 unlock_page(page);
938 break;
939 }
940 if (PageWriteback(page) || PageFsCache(page)) {
941 if (wbc->sync_mode == WB_SYNC_NONE) {
942 dout("%p under writeback\n", page);
943 unlock_page(page);
944 continue;
945 }
946 dout("waiting on writeback %p\n", page);
947 wait_on_page_writeback(page);
948 wait_on_page_fscache(page);
949 }
950
951 if (!clear_page_dirty_for_io(page)) {
952 dout("%p !clear_page_dirty_for_io\n", page);
953 unlock_page(page);
954 continue;
955 }
956
957 /*
958 * We have something to write. If this is
959 * the first locked page this time through,
960 * calculate max possinle write size and
961 * allocate a page array
962 */
963 if (locked_pages == 0) {
964 u64 objnum;
965 u64 objoff;
966 u32 xlen;
967
968 /* prepare async write request */
969 offset = (u64)page_offset(page);
970 ceph_calc_file_object_mapping(&ci->i_layout,
971 offset, wsize,
972 &objnum, &objoff,
973 &xlen);
974 len = xlen;
975
976 num_ops = 1;
977 strip_unit_end = page->index +
978 ((len - 1) >> PAGE_SHIFT);
979
980 BUG_ON(pages);
981 max_pages = calc_pages_for(0, (u64)len);
982 pages = kmalloc_array(max_pages,
983 sizeof(*pages),
984 GFP_NOFS);
985 if (!pages) {
986 from_pool = true;
987 pages = mempool_alloc(ceph_wb_pagevec_pool, GFP_NOFS);
988 BUG_ON(!pages);
989 }
990
991 len = 0;
992 } else if (page->index !=
993 (offset + len) >> PAGE_SHIFT) {
994 if (num_ops >= (from_pool ? CEPH_OSD_SLAB_OPS :
995 CEPH_OSD_MAX_OPS)) {
996 redirty_page_for_writepage(wbc, page);
997 unlock_page(page);
998 break;
999 }
1000
1001 num_ops++;
1002 offset = (u64)page_offset(page);
1003 len = 0;
1004 }
1005
1006 /* note position of first page in pvec */
1007 dout("%p will write page %p idx %lu\n",
1008 inode, page, page->index);
1009
1010 if (atomic_long_inc_return(&fsc->writeback_count) >
1011 CONGESTION_ON_THRESH(
1012 fsc->mount_options->congestion_kb))
1013 fsc->write_congested = true;
1014
1015 pages[locked_pages++] = page;
1016 pvec.pages[i] = NULL;
1017
1018 len += thp_size(page);
1019 }
1020
1021 /* did we get anything? */
1022 if (!locked_pages)
1023 goto release_pvec_pages;
1024 if (i) {
1025 unsigned j, n = 0;
1026 /* shift unused page to beginning of pvec */
1027 for (j = 0; j < pvec_pages; j++) {
1028 if (!pvec.pages[j])
1029 continue;
1030 if (n < j)
1031 pvec.pages[n] = pvec.pages[j];
1032 n++;
1033 }
1034 pvec.nr = n;
1035
1036 if (pvec_pages && i == pvec_pages &&
1037 locked_pages < max_pages) {
1038 dout("reached end pvec, trying for more\n");
1039 pagevec_release(&pvec);
1040 goto get_more_pages;
1041 }
1042 }
1043
1044new_request:
1045 offset = page_offset(pages[0]);
1046 len = wsize;
1047
1048 req = ceph_osdc_new_request(&fsc->client->osdc,
1049 &ci->i_layout, vino,
1050 offset, &len, 0, num_ops,
1051 CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE,
1052 snapc, ceph_wbc.truncate_seq,
1053 ceph_wbc.truncate_size, false);
1054 if (IS_ERR(req)) {
1055 req = ceph_osdc_new_request(&fsc->client->osdc,
1056 &ci->i_layout, vino,
1057 offset, &len, 0,
1058 min(num_ops,
1059 CEPH_OSD_SLAB_OPS),
1060 CEPH_OSD_OP_WRITE,
1061 CEPH_OSD_FLAG_WRITE,
1062 snapc, ceph_wbc.truncate_seq,
1063 ceph_wbc.truncate_size, true);
1064 BUG_ON(IS_ERR(req));
1065 }
1066 BUG_ON(len < page_offset(pages[locked_pages - 1]) +
1067 thp_size(page) - offset);
1068
1069 req->r_callback = writepages_finish;
1070 req->r_inode = inode;
1071
1072 /* Format the osd request message and submit the write */
1073 len = 0;
1074 data_pages = pages;
1075 op_idx = 0;
1076 for (i = 0; i < locked_pages; i++) {
1077 u64 cur_offset = page_offset(pages[i]);
1078 /*
1079 * Discontinuity in page range? Ceph can handle that by just passing
1080 * multiple extents in the write op.
1081 */
1082 if (offset + len != cur_offset) {
1083 /* If it's full, stop here */
1084 if (op_idx + 1 == req->r_num_ops)
1085 break;
1086
1087 /* Kick off an fscache write with what we have so far. */
1088 ceph_fscache_write_to_cache(inode, offset, len, caching);
1089
1090 /* Start a new extent */
1091 osd_req_op_extent_dup_last(req, op_idx,
1092 cur_offset - offset);
1093 dout("writepages got pages at %llu~%llu\n",
1094 offset, len);
1095 osd_req_op_extent_osd_data_pages(req, op_idx,
1096 data_pages, len, 0,
1097 from_pool, false);
1098 osd_req_op_extent_update(req, op_idx, len);
1099
1100 len = 0;
1101 offset = cur_offset;
1102 data_pages = pages + i;
1103 op_idx++;
1104 }
1105
1106 set_page_writeback(pages[i]);
1107 if (caching)
1108 ceph_set_page_fscache(pages[i]);
1109 len += thp_size(page);
1110 }
1111 ceph_fscache_write_to_cache(inode, offset, len, caching);
1112
1113 if (ceph_wbc.size_stable) {
1114 len = min(len, ceph_wbc.i_size - offset);
1115 } else if (i == locked_pages) {
1116 /* writepages_finish() clears writeback pages
1117 * according to the data length, so make sure
1118 * data length covers all locked pages */
1119 u64 min_len = len + 1 - thp_size(page);
1120 len = get_writepages_data_length(inode, pages[i - 1],
1121 offset);
1122 len = max(len, min_len);
1123 }
1124 dout("writepages got pages at %llu~%llu\n", offset, len);
1125
1126 osd_req_op_extent_osd_data_pages(req, op_idx, data_pages, len,
1127 0, from_pool, false);
1128 osd_req_op_extent_update(req, op_idx, len);
1129
1130 BUG_ON(op_idx + 1 != req->r_num_ops);
1131
1132 from_pool = false;
1133 if (i < locked_pages) {
1134 BUG_ON(num_ops <= req->r_num_ops);
1135 num_ops -= req->r_num_ops;
1136 locked_pages -= i;
1137
1138 /* allocate new pages array for next request */
1139 data_pages = pages;
1140 pages = kmalloc_array(locked_pages, sizeof(*pages),
1141 GFP_NOFS);
1142 if (!pages) {
1143 from_pool = true;
1144 pages = mempool_alloc(ceph_wb_pagevec_pool, GFP_NOFS);
1145 BUG_ON(!pages);
1146 }
1147 memcpy(pages, data_pages + i,
1148 locked_pages * sizeof(*pages));
1149 memset(data_pages + i, 0,
1150 locked_pages * sizeof(*pages));
1151 } else {
1152 BUG_ON(num_ops != req->r_num_ops);
1153 index = pages[i - 1]->index + 1;
1154 /* request message now owns the pages array */
1155 pages = NULL;
1156 }
1157
1158 req->r_mtime = inode->i_mtime;
1159 ceph_osdc_start_request(&fsc->client->osdc, req);
1160 req = NULL;
1161
1162 wbc->nr_to_write -= i;
1163 if (pages)
1164 goto new_request;
1165
1166 /*
1167 * We stop writing back only if we are not doing
1168 * integrity sync. In case of integrity sync we have to
1169 * keep going until we have written all the pages
1170 * we tagged for writeback prior to entering this loop.
1171 */
1172 if (wbc->nr_to_write <= 0 && wbc->sync_mode == WB_SYNC_NONE)
1173 done = true;
1174
1175release_pvec_pages:
1176 dout("pagevec_release on %d pages (%p)\n", (int)pvec.nr,
1177 pvec.nr ? pvec.pages[0] : NULL);
1178 pagevec_release(&pvec);
1179 }
1180
1181 if (should_loop && !done) {
1182 /* more to do; loop back to beginning of file */
1183 dout("writepages looping back to beginning of file\n");
1184 end = start_index - 1; /* OK even when start_index == 0 */
1185
1186 /* to write dirty pages associated with next snapc,
1187 * we need to wait until current writes complete */
1188 if (wbc->sync_mode != WB_SYNC_NONE &&
1189 start_index == 0 && /* all dirty pages were checked */
1190 !ceph_wbc.head_snapc) {
1191 struct page *page;
1192 unsigned i, nr;
1193 index = 0;
1194 while ((index <= end) &&
1195 (nr = pagevec_lookup_tag(&pvec, mapping, &index,
1196 PAGECACHE_TAG_WRITEBACK))) {
1197 for (i = 0; i < nr; i++) {
1198 page = pvec.pages[i];
1199 if (page_snap_context(page) != snapc)
1200 continue;
1201 wait_on_page_writeback(page);
1202 }
1203 pagevec_release(&pvec);
1204 cond_resched();
1205 }
1206 }
1207
1208 start_index = 0;
1209 index = 0;
1210 goto retry;
1211 }
1212
1213 if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
1214 mapping->writeback_index = index;
1215
1216out:
1217 ceph_osdc_put_request(req);
1218 ceph_put_snap_context(last_snapc);
1219 dout("writepages dend - startone, rc = %d\n", rc);
1220 return rc;
1221}
1222
1223
1224
1225/*
1226 * See if a given @snapc is either writeable, or already written.
1227 */
1228static int context_is_writeable_or_written(struct inode *inode,
1229 struct ceph_snap_context *snapc)
1230{
1231 struct ceph_snap_context *oldest = get_oldest_context(inode, NULL, NULL);
1232 int ret = !oldest || snapc->seq <= oldest->seq;
1233
1234 ceph_put_snap_context(oldest);
1235 return ret;
1236}
1237
1238/**
1239 * ceph_find_incompatible - find an incompatible context and return it
1240 * @page: page being dirtied
1241 *
1242 * We are only allowed to write into/dirty a page if the page is
1243 * clean, or already dirty within the same snap context. Returns a
1244 * conflicting context if there is one, NULL if there isn't, or a
1245 * negative error code on other errors.
1246 *
1247 * Must be called with page lock held.
1248 */
1249static struct ceph_snap_context *
1250ceph_find_incompatible(struct page *page)
1251{
1252 struct inode *inode = page->mapping->host;
1253 struct ceph_inode_info *ci = ceph_inode(inode);
1254
1255 if (ceph_inode_is_shutdown(inode)) {
1256 dout(" page %p %llx:%llx is shutdown\n", page,
1257 ceph_vinop(inode));
1258 return ERR_PTR(-ESTALE);
1259 }
1260
1261 for (;;) {
1262 struct ceph_snap_context *snapc, *oldest;
1263
1264 wait_on_page_writeback(page);
1265
1266 snapc = page_snap_context(page);
1267 if (!snapc || snapc == ci->i_head_snapc)
1268 break;
1269
1270 /*
1271 * this page is already dirty in another (older) snap
1272 * context! is it writeable now?
1273 */
1274 oldest = get_oldest_context(inode, NULL, NULL);
1275 if (snapc->seq > oldest->seq) {
1276 /* not writeable -- return it for the caller to deal with */
1277 ceph_put_snap_context(oldest);
1278 dout(" page %p snapc %p not current or oldest\n", page, snapc);
1279 return ceph_get_snap_context(snapc);
1280 }
1281 ceph_put_snap_context(oldest);
1282
1283 /* yay, writeable, do it now (without dropping page lock) */
1284 dout(" page %p snapc %p not current, but oldest\n", page, snapc);
1285 if (clear_page_dirty_for_io(page)) {
1286 int r = writepage_nounlock(page, NULL);
1287 if (r < 0)
1288 return ERR_PTR(r);
1289 }
1290 }
1291 return NULL;
1292}
1293
1294static int ceph_netfs_check_write_begin(struct file *file, loff_t pos, unsigned int len,
1295 struct folio **foliop, void **_fsdata)
1296{
1297 struct inode *inode = file_inode(file);
1298 struct ceph_inode_info *ci = ceph_inode(inode);
1299 struct ceph_snap_context *snapc;
1300
1301 snapc = ceph_find_incompatible(folio_page(*foliop, 0));
1302 if (snapc) {
1303 int r;
1304
1305 folio_unlock(*foliop);
1306 folio_put(*foliop);
1307 *foliop = NULL;
1308 if (IS_ERR(snapc))
1309 return PTR_ERR(snapc);
1310
1311 ceph_queue_writeback(inode);
1312 r = wait_event_killable(ci->i_cap_wq,
1313 context_is_writeable_or_written(inode, snapc));
1314 ceph_put_snap_context(snapc);
1315 return r == 0 ? -EAGAIN : r;
1316 }
1317 return 0;
1318}
1319
1320/*
1321 * We are only allowed to write into/dirty the page if the page is
1322 * clean, or already dirty within the same snap context.
1323 */
1324static int ceph_write_begin(struct file *file, struct address_space *mapping,
1325 loff_t pos, unsigned len,
1326 struct page **pagep, void **fsdata)
1327{
1328 struct inode *inode = file_inode(file);
1329 struct ceph_inode_info *ci = ceph_inode(inode);
1330 struct folio *folio = NULL;
1331 int r;
1332
1333 r = netfs_write_begin(&ci->netfs, file, inode->i_mapping, pos, len, &folio, NULL);
1334 if (r < 0)
1335 return r;
1336
1337 folio_wait_fscache(folio);
1338 WARN_ON_ONCE(!folio_test_locked(folio));
1339 *pagep = &folio->page;
1340 return 0;
1341}
1342
1343/*
1344 * we don't do anything in here that simple_write_end doesn't do
1345 * except adjust dirty page accounting
1346 */
1347static int ceph_write_end(struct file *file, struct address_space *mapping,
1348 loff_t pos, unsigned len, unsigned copied,
1349 struct page *subpage, void *fsdata)
1350{
1351 struct folio *folio = page_folio(subpage);
1352 struct inode *inode = file_inode(file);
1353 bool check_cap = false;
1354
1355 dout("write_end file %p inode %p folio %p %d~%d (%d)\n", file,
1356 inode, folio, (int)pos, (int)copied, (int)len);
1357
1358 if (!folio_test_uptodate(folio)) {
1359 /* just return that nothing was copied on a short copy */
1360 if (copied < len) {
1361 copied = 0;
1362 goto out;
1363 }
1364 folio_mark_uptodate(folio);
1365 }
1366
1367 /* did file size increase? */
1368 if (pos+copied > i_size_read(inode))
1369 check_cap = ceph_inode_set_size(inode, pos+copied);
1370
1371 folio_mark_dirty(folio);
1372
1373out:
1374 folio_unlock(folio);
1375 folio_put(folio);
1376
1377 if (check_cap)
1378 ceph_check_caps(ceph_inode(inode), CHECK_CAPS_AUTHONLY);
1379
1380 return copied;
1381}
1382
1383const struct address_space_operations ceph_aops = {
1384 .read_folio = netfs_read_folio,
1385 .readahead = netfs_readahead,
1386 .writepage = ceph_writepage,
1387 .writepages = ceph_writepages_start,
1388 .write_begin = ceph_write_begin,
1389 .write_end = ceph_write_end,
1390 .dirty_folio = ceph_dirty_folio,
1391 .invalidate_folio = ceph_invalidate_folio,
1392 .release_folio = ceph_release_folio,
1393 .direct_IO = noop_direct_IO,
1394};
1395
1396static void ceph_block_sigs(sigset_t *oldset)
1397{
1398 sigset_t mask;
1399 siginitsetinv(&mask, sigmask(SIGKILL));
1400 sigprocmask(SIG_BLOCK, &mask, oldset);
1401}
1402
1403static void ceph_restore_sigs(sigset_t *oldset)
1404{
1405 sigprocmask(SIG_SETMASK, oldset, NULL);
1406}
1407
1408/*
1409 * vm ops
1410 */
1411static vm_fault_t ceph_filemap_fault(struct vm_fault *vmf)
1412{
1413 struct vm_area_struct *vma = vmf->vma;
1414 struct inode *inode = file_inode(vma->vm_file);
1415 struct ceph_inode_info *ci = ceph_inode(inode);
1416 struct ceph_file_info *fi = vma->vm_file->private_data;
1417 loff_t off = (loff_t)vmf->pgoff << PAGE_SHIFT;
1418 int want, got, err;
1419 sigset_t oldset;
1420 vm_fault_t ret = VM_FAULT_SIGBUS;
1421
1422 if (ceph_inode_is_shutdown(inode))
1423 return ret;
1424
1425 ceph_block_sigs(&oldset);
1426
1427 dout("filemap_fault %p %llx.%llx %llu trying to get caps\n",
1428 inode, ceph_vinop(inode), off);
1429 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1430 want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
1431 else
1432 want = CEPH_CAP_FILE_CACHE;
1433
1434 got = 0;
1435 err = ceph_get_caps(vma->vm_file, CEPH_CAP_FILE_RD, want, -1, &got);
1436 if (err < 0)
1437 goto out_restore;
1438
1439 dout("filemap_fault %p %llu got cap refs on %s\n",
1440 inode, off, ceph_cap_string(got));
1441
1442 if ((got & (CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO)) ||
1443 !ceph_has_inline_data(ci)) {
1444 CEPH_DEFINE_RW_CONTEXT(rw_ctx, got);
1445 ceph_add_rw_context(fi, &rw_ctx);
1446 ret = filemap_fault(vmf);
1447 ceph_del_rw_context(fi, &rw_ctx);
1448 dout("filemap_fault %p %llu drop cap refs %s ret %x\n",
1449 inode, off, ceph_cap_string(got), ret);
1450 } else
1451 err = -EAGAIN;
1452
1453 ceph_put_cap_refs(ci, got);
1454
1455 if (err != -EAGAIN)
1456 goto out_restore;
1457
1458 /* read inline data */
1459 if (off >= PAGE_SIZE) {
1460 /* does not support inline data > PAGE_SIZE */
1461 ret = VM_FAULT_SIGBUS;
1462 } else {
1463 struct address_space *mapping = inode->i_mapping;
1464 struct page *page;
1465
1466 filemap_invalidate_lock_shared(mapping);
1467 page = find_or_create_page(mapping, 0,
1468 mapping_gfp_constraint(mapping, ~__GFP_FS));
1469 if (!page) {
1470 ret = VM_FAULT_OOM;
1471 goto out_inline;
1472 }
1473 err = __ceph_do_getattr(inode, page,
1474 CEPH_STAT_CAP_INLINE_DATA, true);
1475 if (err < 0 || off >= i_size_read(inode)) {
1476 unlock_page(page);
1477 put_page(page);
1478 ret = vmf_error(err);
1479 goto out_inline;
1480 }
1481 if (err < PAGE_SIZE)
1482 zero_user_segment(page, err, PAGE_SIZE);
1483 else
1484 flush_dcache_page(page);
1485 SetPageUptodate(page);
1486 vmf->page = page;
1487 ret = VM_FAULT_MAJOR | VM_FAULT_LOCKED;
1488out_inline:
1489 filemap_invalidate_unlock_shared(mapping);
1490 dout("filemap_fault %p %llu read inline data ret %x\n",
1491 inode, off, ret);
1492 }
1493out_restore:
1494 ceph_restore_sigs(&oldset);
1495 if (err < 0)
1496 ret = vmf_error(err);
1497
1498 return ret;
1499}
1500
1501static vm_fault_t ceph_page_mkwrite(struct vm_fault *vmf)
1502{
1503 struct vm_area_struct *vma = vmf->vma;
1504 struct inode *inode = file_inode(vma->vm_file);
1505 struct ceph_inode_info *ci = ceph_inode(inode);
1506 struct ceph_file_info *fi = vma->vm_file->private_data;
1507 struct ceph_cap_flush *prealloc_cf;
1508 struct page *page = vmf->page;
1509 loff_t off = page_offset(page);
1510 loff_t size = i_size_read(inode);
1511 size_t len;
1512 int want, got, err;
1513 sigset_t oldset;
1514 vm_fault_t ret = VM_FAULT_SIGBUS;
1515
1516 if (ceph_inode_is_shutdown(inode))
1517 return ret;
1518
1519 prealloc_cf = ceph_alloc_cap_flush();
1520 if (!prealloc_cf)
1521 return VM_FAULT_OOM;
1522
1523 sb_start_pagefault(inode->i_sb);
1524 ceph_block_sigs(&oldset);
1525
1526 if (off + thp_size(page) <= size)
1527 len = thp_size(page);
1528 else
1529 len = offset_in_thp(page, size);
1530
1531 dout("page_mkwrite %p %llx.%llx %llu~%zd getting caps i_size %llu\n",
1532 inode, ceph_vinop(inode), off, len, size);
1533 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1534 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
1535 else
1536 want = CEPH_CAP_FILE_BUFFER;
1537
1538 got = 0;
1539 err = ceph_get_caps(vma->vm_file, CEPH_CAP_FILE_WR, want, off + len, &got);
1540 if (err < 0)
1541 goto out_free;
1542
1543 dout("page_mkwrite %p %llu~%zd got cap refs on %s\n",
1544 inode, off, len, ceph_cap_string(got));
1545
1546 /* Update time before taking page lock */
1547 file_update_time(vma->vm_file);
1548 inode_inc_iversion_raw(inode);
1549
1550 do {
1551 struct ceph_snap_context *snapc;
1552
1553 lock_page(page);
1554
1555 if (page_mkwrite_check_truncate(page, inode) < 0) {
1556 unlock_page(page);
1557 ret = VM_FAULT_NOPAGE;
1558 break;
1559 }
1560
1561 snapc = ceph_find_incompatible(page);
1562 if (!snapc) {
1563 /* success. we'll keep the page locked. */
1564 set_page_dirty(page);
1565 ret = VM_FAULT_LOCKED;
1566 break;
1567 }
1568
1569 unlock_page(page);
1570
1571 if (IS_ERR(snapc)) {
1572 ret = VM_FAULT_SIGBUS;
1573 break;
1574 }
1575
1576 ceph_queue_writeback(inode);
1577 err = wait_event_killable(ci->i_cap_wq,
1578 context_is_writeable_or_written(inode, snapc));
1579 ceph_put_snap_context(snapc);
1580 } while (err == 0);
1581
1582 if (ret == VM_FAULT_LOCKED) {
1583 int dirty;
1584 spin_lock(&ci->i_ceph_lock);
1585 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
1586 &prealloc_cf);
1587 spin_unlock(&ci->i_ceph_lock);
1588 if (dirty)
1589 __mark_inode_dirty(inode, dirty);
1590 }
1591
1592 dout("page_mkwrite %p %llu~%zd dropping cap refs on %s ret %x\n",
1593 inode, off, len, ceph_cap_string(got), ret);
1594 ceph_put_cap_refs_async(ci, got);
1595out_free:
1596 ceph_restore_sigs(&oldset);
1597 sb_end_pagefault(inode->i_sb);
1598 ceph_free_cap_flush(prealloc_cf);
1599 if (err < 0)
1600 ret = vmf_error(err);
1601 return ret;
1602}
1603
1604void ceph_fill_inline_data(struct inode *inode, struct page *locked_page,
1605 char *data, size_t len)
1606{
1607 struct address_space *mapping = inode->i_mapping;
1608 struct page *page;
1609
1610 if (locked_page) {
1611 page = locked_page;
1612 } else {
1613 if (i_size_read(inode) == 0)
1614 return;
1615 page = find_or_create_page(mapping, 0,
1616 mapping_gfp_constraint(mapping,
1617 ~__GFP_FS));
1618 if (!page)
1619 return;
1620 if (PageUptodate(page)) {
1621 unlock_page(page);
1622 put_page(page);
1623 return;
1624 }
1625 }
1626
1627 dout("fill_inline_data %p %llx.%llx len %zu locked_page %p\n",
1628 inode, ceph_vinop(inode), len, locked_page);
1629
1630 if (len > 0) {
1631 void *kaddr = kmap_atomic(page);
1632 memcpy(kaddr, data, len);
1633 kunmap_atomic(kaddr);
1634 }
1635
1636 if (page != locked_page) {
1637 if (len < PAGE_SIZE)
1638 zero_user_segment(page, len, PAGE_SIZE);
1639 else
1640 flush_dcache_page(page);
1641
1642 SetPageUptodate(page);
1643 unlock_page(page);
1644 put_page(page);
1645 }
1646}
1647
1648int ceph_uninline_data(struct file *file)
1649{
1650 struct inode *inode = file_inode(file);
1651 struct ceph_inode_info *ci = ceph_inode(inode);
1652 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1653 struct ceph_osd_request *req = NULL;
1654 struct ceph_cap_flush *prealloc_cf = NULL;
1655 struct folio *folio = NULL;
1656 u64 inline_version = CEPH_INLINE_NONE;
1657 struct page *pages[1];
1658 int err = 0;
1659 u64 len;
1660
1661 spin_lock(&ci->i_ceph_lock);
1662 inline_version = ci->i_inline_version;
1663 spin_unlock(&ci->i_ceph_lock);
1664
1665 dout("uninline_data %p %llx.%llx inline_version %llu\n",
1666 inode, ceph_vinop(inode), inline_version);
1667
1668 if (ceph_inode_is_shutdown(inode)) {
1669 err = -EIO;
1670 goto out;
1671 }
1672
1673 if (inline_version == CEPH_INLINE_NONE)
1674 return 0;
1675
1676 prealloc_cf = ceph_alloc_cap_flush();
1677 if (!prealloc_cf)
1678 return -ENOMEM;
1679
1680 if (inline_version == 1) /* initial version, no data */
1681 goto out_uninline;
1682
1683 folio = read_mapping_folio(inode->i_mapping, 0, file);
1684 if (IS_ERR(folio)) {
1685 err = PTR_ERR(folio);
1686 goto out;
1687 }
1688
1689 folio_lock(folio);
1690
1691 len = i_size_read(inode);
1692 if (len > folio_size(folio))
1693 len = folio_size(folio);
1694
1695 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1696 ceph_vino(inode), 0, &len, 0, 1,
1697 CEPH_OSD_OP_CREATE, CEPH_OSD_FLAG_WRITE,
1698 NULL, 0, 0, false);
1699 if (IS_ERR(req)) {
1700 err = PTR_ERR(req);
1701 goto out_unlock;
1702 }
1703
1704 req->r_mtime = inode->i_mtime;
1705 ceph_osdc_start_request(&fsc->client->osdc, req);
1706 err = ceph_osdc_wait_request(&fsc->client->osdc, req);
1707 ceph_osdc_put_request(req);
1708 if (err < 0)
1709 goto out_unlock;
1710
1711 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1712 ceph_vino(inode), 0, &len, 1, 3,
1713 CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE,
1714 NULL, ci->i_truncate_seq,
1715 ci->i_truncate_size, false);
1716 if (IS_ERR(req)) {
1717 err = PTR_ERR(req);
1718 goto out_unlock;
1719 }
1720
1721 pages[0] = folio_page(folio, 0);
1722 osd_req_op_extent_osd_data_pages(req, 1, pages, len, 0, false, false);
1723
1724 {
1725 __le64 xattr_buf = cpu_to_le64(inline_version);
1726 err = osd_req_op_xattr_init(req, 0, CEPH_OSD_OP_CMPXATTR,
1727 "inline_version", &xattr_buf,
1728 sizeof(xattr_buf),
1729 CEPH_OSD_CMPXATTR_OP_GT,
1730 CEPH_OSD_CMPXATTR_MODE_U64);
1731 if (err)
1732 goto out_put_req;
1733 }
1734
1735 {
1736 char xattr_buf[32];
1737 int xattr_len = snprintf(xattr_buf, sizeof(xattr_buf),
1738 "%llu", inline_version);
1739 err = osd_req_op_xattr_init(req, 2, CEPH_OSD_OP_SETXATTR,
1740 "inline_version",
1741 xattr_buf, xattr_len, 0, 0);
1742 if (err)
1743 goto out_put_req;
1744 }
1745
1746 req->r_mtime = inode->i_mtime;
1747 ceph_osdc_start_request(&fsc->client->osdc, req);
1748 err = ceph_osdc_wait_request(&fsc->client->osdc, req);
1749
1750 ceph_update_write_metrics(&fsc->mdsc->metric, req->r_start_latency,
1751 req->r_end_latency, len, err);
1752
1753out_uninline:
1754 if (!err) {
1755 int dirty;
1756
1757 /* Set to CAP_INLINE_NONE and dirty the caps */
1758 down_read(&fsc->mdsc->snap_rwsem);
1759 spin_lock(&ci->i_ceph_lock);
1760 ci->i_inline_version = CEPH_INLINE_NONE;
1761 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR, &prealloc_cf);
1762 spin_unlock(&ci->i_ceph_lock);
1763 up_read(&fsc->mdsc->snap_rwsem);
1764 if (dirty)
1765 __mark_inode_dirty(inode, dirty);
1766 }
1767out_put_req:
1768 ceph_osdc_put_request(req);
1769 if (err == -ECANCELED)
1770 err = 0;
1771out_unlock:
1772 if (folio) {
1773 folio_unlock(folio);
1774 folio_put(folio);
1775 }
1776out:
1777 ceph_free_cap_flush(prealloc_cf);
1778 dout("uninline_data %p %llx.%llx inline_version %llu = %d\n",
1779 inode, ceph_vinop(inode), inline_version, err);
1780 return err;
1781}
1782
1783static const struct vm_operations_struct ceph_vmops = {
1784 .fault = ceph_filemap_fault,
1785 .page_mkwrite = ceph_page_mkwrite,
1786};
1787
1788int ceph_mmap(struct file *file, struct vm_area_struct *vma)
1789{
1790 struct address_space *mapping = file->f_mapping;
1791
1792 if (!mapping->a_ops->read_folio)
1793 return -ENOEXEC;
1794 vma->vm_ops = &ceph_vmops;
1795 return 0;
1796}
1797
1798enum {
1799 POOL_READ = 1,
1800 POOL_WRITE = 2,
1801};
1802
1803static int __ceph_pool_perm_get(struct ceph_inode_info *ci,
1804 s64 pool, struct ceph_string *pool_ns)
1805{
1806 struct ceph_fs_client *fsc = ceph_inode_to_client(&ci->netfs.inode);
1807 struct ceph_mds_client *mdsc = fsc->mdsc;
1808 struct ceph_osd_request *rd_req = NULL, *wr_req = NULL;
1809 struct rb_node **p, *parent;
1810 struct ceph_pool_perm *perm;
1811 struct page **pages;
1812 size_t pool_ns_len;
1813 int err = 0, err2 = 0, have = 0;
1814
1815 down_read(&mdsc->pool_perm_rwsem);
1816 p = &mdsc->pool_perm_tree.rb_node;
1817 while (*p) {
1818 perm = rb_entry(*p, struct ceph_pool_perm, node);
1819 if (pool < perm->pool)
1820 p = &(*p)->rb_left;
1821 else if (pool > perm->pool)
1822 p = &(*p)->rb_right;
1823 else {
1824 int ret = ceph_compare_string(pool_ns,
1825 perm->pool_ns,
1826 perm->pool_ns_len);
1827 if (ret < 0)
1828 p = &(*p)->rb_left;
1829 else if (ret > 0)
1830 p = &(*p)->rb_right;
1831 else {
1832 have = perm->perm;
1833 break;
1834 }
1835 }
1836 }
1837 up_read(&mdsc->pool_perm_rwsem);
1838 if (*p)
1839 goto out;
1840
1841 if (pool_ns)
1842 dout("__ceph_pool_perm_get pool %lld ns %.*s no perm cached\n",
1843 pool, (int)pool_ns->len, pool_ns->str);
1844 else
1845 dout("__ceph_pool_perm_get pool %lld no perm cached\n", pool);
1846
1847 down_write(&mdsc->pool_perm_rwsem);
1848 p = &mdsc->pool_perm_tree.rb_node;
1849 parent = NULL;
1850 while (*p) {
1851 parent = *p;
1852 perm = rb_entry(parent, struct ceph_pool_perm, node);
1853 if (pool < perm->pool)
1854 p = &(*p)->rb_left;
1855 else if (pool > perm->pool)
1856 p = &(*p)->rb_right;
1857 else {
1858 int ret = ceph_compare_string(pool_ns,
1859 perm->pool_ns,
1860 perm->pool_ns_len);
1861 if (ret < 0)
1862 p = &(*p)->rb_left;
1863 else if (ret > 0)
1864 p = &(*p)->rb_right;
1865 else {
1866 have = perm->perm;
1867 break;
1868 }
1869 }
1870 }
1871 if (*p) {
1872 up_write(&mdsc->pool_perm_rwsem);
1873 goto out;
1874 }
1875
1876 rd_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL,
1877 1, false, GFP_NOFS);
1878 if (!rd_req) {
1879 err = -ENOMEM;
1880 goto out_unlock;
1881 }
1882
1883 rd_req->r_flags = CEPH_OSD_FLAG_READ;
1884 osd_req_op_init(rd_req, 0, CEPH_OSD_OP_STAT, 0);
1885 rd_req->r_base_oloc.pool = pool;
1886 if (pool_ns)
1887 rd_req->r_base_oloc.pool_ns = ceph_get_string(pool_ns);
1888 ceph_oid_printf(&rd_req->r_base_oid, "%llx.00000000", ci->i_vino.ino);
1889
1890 err = ceph_osdc_alloc_messages(rd_req, GFP_NOFS);
1891 if (err)
1892 goto out_unlock;
1893
1894 wr_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL,
1895 1, false, GFP_NOFS);
1896 if (!wr_req) {
1897 err = -ENOMEM;
1898 goto out_unlock;
1899 }
1900
1901 wr_req->r_flags = CEPH_OSD_FLAG_WRITE;
1902 osd_req_op_init(wr_req, 0, CEPH_OSD_OP_CREATE, CEPH_OSD_OP_FLAG_EXCL);
1903 ceph_oloc_copy(&wr_req->r_base_oloc, &rd_req->r_base_oloc);
1904 ceph_oid_copy(&wr_req->r_base_oid, &rd_req->r_base_oid);
1905
1906 err = ceph_osdc_alloc_messages(wr_req, GFP_NOFS);
1907 if (err)
1908 goto out_unlock;
1909
1910 /* one page should be large enough for STAT data */
1911 pages = ceph_alloc_page_vector(1, GFP_KERNEL);
1912 if (IS_ERR(pages)) {
1913 err = PTR_ERR(pages);
1914 goto out_unlock;
1915 }
1916
1917 osd_req_op_raw_data_in_pages(rd_req, 0, pages, PAGE_SIZE,
1918 0, false, true);
1919 ceph_osdc_start_request(&fsc->client->osdc, rd_req);
1920
1921 wr_req->r_mtime = ci->netfs.inode.i_mtime;
1922 ceph_osdc_start_request(&fsc->client->osdc, wr_req);
1923
1924 err = ceph_osdc_wait_request(&fsc->client->osdc, rd_req);
1925 err2 = ceph_osdc_wait_request(&fsc->client->osdc, wr_req);
1926
1927 if (err >= 0 || err == -ENOENT)
1928 have |= POOL_READ;
1929 else if (err != -EPERM) {
1930 if (err == -EBLOCKLISTED)
1931 fsc->blocklisted = true;
1932 goto out_unlock;
1933 }
1934
1935 if (err2 == 0 || err2 == -EEXIST)
1936 have |= POOL_WRITE;
1937 else if (err2 != -EPERM) {
1938 if (err2 == -EBLOCKLISTED)
1939 fsc->blocklisted = true;
1940 err = err2;
1941 goto out_unlock;
1942 }
1943
1944 pool_ns_len = pool_ns ? pool_ns->len : 0;
1945 perm = kmalloc(sizeof(*perm) + pool_ns_len + 1, GFP_NOFS);
1946 if (!perm) {
1947 err = -ENOMEM;
1948 goto out_unlock;
1949 }
1950
1951 perm->pool = pool;
1952 perm->perm = have;
1953 perm->pool_ns_len = pool_ns_len;
1954 if (pool_ns_len > 0)
1955 memcpy(perm->pool_ns, pool_ns->str, pool_ns_len);
1956 perm->pool_ns[pool_ns_len] = 0;
1957
1958 rb_link_node(&perm->node, parent, p);
1959 rb_insert_color(&perm->node, &mdsc->pool_perm_tree);
1960 err = 0;
1961out_unlock:
1962 up_write(&mdsc->pool_perm_rwsem);
1963
1964 ceph_osdc_put_request(rd_req);
1965 ceph_osdc_put_request(wr_req);
1966out:
1967 if (!err)
1968 err = have;
1969 if (pool_ns)
1970 dout("__ceph_pool_perm_get pool %lld ns %.*s result = %d\n",
1971 pool, (int)pool_ns->len, pool_ns->str, err);
1972 else
1973 dout("__ceph_pool_perm_get pool %lld result = %d\n", pool, err);
1974 return err;
1975}
1976
1977int ceph_pool_perm_check(struct inode *inode, int need)
1978{
1979 struct ceph_inode_info *ci = ceph_inode(inode);
1980 struct ceph_string *pool_ns;
1981 s64 pool;
1982 int ret, flags;
1983
1984 /* Only need to do this for regular files */
1985 if (!S_ISREG(inode->i_mode))
1986 return 0;
1987
1988 if (ci->i_vino.snap != CEPH_NOSNAP) {
1989 /*
1990 * Pool permission check needs to write to the first object.
1991 * But for snapshot, head of the first object may have alread
1992 * been deleted. Skip check to avoid creating orphan object.
1993 */
1994 return 0;
1995 }
1996
1997 if (ceph_test_mount_opt(ceph_inode_to_client(inode),
1998 NOPOOLPERM))
1999 return 0;
2000
2001 spin_lock(&ci->i_ceph_lock);
2002 flags = ci->i_ceph_flags;
2003 pool = ci->i_layout.pool_id;
2004 spin_unlock(&ci->i_ceph_lock);
2005check:
2006 if (flags & CEPH_I_POOL_PERM) {
2007 if ((need & CEPH_CAP_FILE_RD) && !(flags & CEPH_I_POOL_RD)) {
2008 dout("ceph_pool_perm_check pool %lld no read perm\n",
2009 pool);
2010 return -EPERM;
2011 }
2012 if ((need & CEPH_CAP_FILE_WR) && !(flags & CEPH_I_POOL_WR)) {
2013 dout("ceph_pool_perm_check pool %lld no write perm\n",
2014 pool);
2015 return -EPERM;
2016 }
2017 return 0;
2018 }
2019
2020 pool_ns = ceph_try_get_string(ci->i_layout.pool_ns);
2021 ret = __ceph_pool_perm_get(ci, pool, pool_ns);
2022 ceph_put_string(pool_ns);
2023 if (ret < 0)
2024 return ret;
2025
2026 flags = CEPH_I_POOL_PERM;
2027 if (ret & POOL_READ)
2028 flags |= CEPH_I_POOL_RD;
2029 if (ret & POOL_WRITE)
2030 flags |= CEPH_I_POOL_WR;
2031
2032 spin_lock(&ci->i_ceph_lock);
2033 if (pool == ci->i_layout.pool_id &&
2034 pool_ns == rcu_dereference_raw(ci->i_layout.pool_ns)) {
2035 ci->i_ceph_flags |= flags;
2036 } else {
2037 pool = ci->i_layout.pool_id;
2038 flags = ci->i_ceph_flags;
2039 }
2040 spin_unlock(&ci->i_ceph_lock);
2041 goto check;
2042}
2043
2044void ceph_pool_perm_destroy(struct ceph_mds_client *mdsc)
2045{
2046 struct ceph_pool_perm *perm;
2047 struct rb_node *n;
2048
2049 while (!RB_EMPTY_ROOT(&mdsc->pool_perm_tree)) {
2050 n = rb_first(&mdsc->pool_perm_tree);
2051 perm = rb_entry(n, struct ceph_pool_perm, node);
2052 rb_erase(n, &mdsc->pool_perm_tree);
2053 kfree(perm);
2054 }
2055}