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Merge tag 'linux-kselftest-4.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel...
[linux/fpc-iii.git] / fs / ceph / addr.c
blobdbf07051aacd26b3daafd1e87a0e1d7e36fe553c
1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/ceph/ceph_debug.h>
3
4 #include <linux/backing-dev.h>
5 #include <linux/fs.h>
6 #include <linux/mm.h>
7 #include <linux/pagemap.h>
8 #include <linux/writeback.h> /* generic_writepages */
9 #include <linux/slab.h>
10 #include <linux/pagevec.h>
11 #include <linux/task_io_accounting_ops.h>
12 #include <linux/signal.h>
13
14 #include "super.h"
15 #include "mds_client.h"
16 #include "cache.h"
17 #include <linux/ceph/osd_client.h>
18
19 /*
20 * Ceph address space ops.
21 *
22 * There are a few funny things going on here.
23 *
24 * The page->private field is used to reference a struct
25 * ceph_snap_context for _every_ dirty page. This indicates which
26 * snapshot the page was logically dirtied in, and thus which snap
27 * context needs to be associated with the osd write during writeback.
28 *
29 * Similarly, struct ceph_inode_info maintains a set of counters to
30 * count dirty pages on the inode. In the absence of snapshots,
31 * i_wrbuffer_ref == i_wrbuffer_ref_head == the dirty page count.
32 *
33 * When a snapshot is taken (that is, when the client receives
34 * notification that a snapshot was taken), each inode with caps and
35 * with dirty pages (dirty pages implies there is a cap) gets a new
36 * ceph_cap_snap in the i_cap_snaps list (which is sorted in ascending
37 * order, new snaps go to the tail). The i_wrbuffer_ref_head count is
38 * moved to capsnap->dirty. (Unless a sync write is currently in
39 * progress. In that case, the capsnap is said to be "pending", new
40 * writes cannot start, and the capsnap isn't "finalized" until the
41 * write completes (or fails) and a final size/mtime for the inode for
42 * that snap can be settled upon.) i_wrbuffer_ref_head is reset to 0.
43 *
44 * On writeback, we must submit writes to the osd IN SNAP ORDER. So,
45 * we look for the first capsnap in i_cap_snaps and write out pages in
46 * that snap context _only_. Then we move on to the next capsnap,
47 * eventually reaching the "live" or "head" context (i.e., pages that
48 * are not yet snapped) and are writing the most recently dirtied
49 * pages.
50 *
51 * Invalidate and so forth must take care to ensure the dirty page
52 * accounting is preserved.
53 */
54
55 #define CONGESTION_ON_THRESH(congestion_kb) (congestion_kb >> (PAGE_SHIFT-10))
56 #define CONGESTION_OFF_THRESH(congestion_kb) \
57 (CONGESTION_ON_THRESH(congestion_kb) - \
58 (CONGESTION_ON_THRESH(congestion_kb) >> 2))
59
60 static inline struct ceph_snap_context *page_snap_context(struct page *page)
61 {
62 if (PagePrivate(page))
63 return (void *)page->private;
64 return NULL;
65 }
66
67 /*
68 * Dirty a page. Optimistically adjust accounting, on the assumption
69 * that we won't race with invalidate. If we do, readjust.
70 */
71 static int ceph_set_page_dirty(struct page *page)
72 {
73 struct address_space *mapping = page->mapping;
74 struct inode *inode;
75 struct ceph_inode_info *ci;
76 struct ceph_snap_context *snapc;
77 int ret;
78
79 if (unlikely(!mapping))
80 return !TestSetPageDirty(page);
81
82 if (PageDirty(page)) {
83 dout("%p set_page_dirty %p idx %lu -- already dirty\n",
84 mapping->host, page, page->index);
85 BUG_ON(!PagePrivate(page));
86 return 0;
87 }
88
89 inode = mapping->host;
90 ci = ceph_inode(inode);
91
92 /* dirty the head */
93 spin_lock(&ci->i_ceph_lock);
94 BUG_ON(ci->i_wr_ref == 0); // caller should hold Fw reference
95 if (__ceph_have_pending_cap_snap(ci)) {
96 struct ceph_cap_snap *capsnap =
97 list_last_entry(&ci->i_cap_snaps,
98 struct ceph_cap_snap,
99 ci_item);
100 snapc = ceph_get_snap_context(capsnap->context);
101 capsnap->dirty_pages++;
102 } else {
103 BUG_ON(!ci->i_head_snapc);
104 snapc = ceph_get_snap_context(ci->i_head_snapc);
105 ++ci->i_wrbuffer_ref_head;
106 }
107 if (ci->i_wrbuffer_ref == 0)
108 ihold(inode);
109 ++ci->i_wrbuffer_ref;
110 dout("%p set_page_dirty %p idx %lu head %d/%d -> %d/%d "
111 "snapc %p seq %lld (%d snaps)\n",
112 mapping->host, page, page->index,
113 ci->i_wrbuffer_ref-1, ci->i_wrbuffer_ref_head-1,
114 ci->i_wrbuffer_ref, ci->i_wrbuffer_ref_head,
115 snapc, snapc->seq, snapc->num_snaps);
116 spin_unlock(&ci->i_ceph_lock);
117
118 /*
119 * Reference snap context in page->private. Also set
120 * PagePrivate so that we get invalidatepage callback.
121 */
122 BUG_ON(PagePrivate(page));
123 page->private = (unsigned long)snapc;
124 SetPagePrivate(page);
125
126 ret = __set_page_dirty_nobuffers(page);
127 WARN_ON(!PageLocked(page));
128 WARN_ON(!page->mapping);
129
130 return ret;
131 }
132
133 /*
134 * If we are truncating the full page (i.e. offset == 0), adjust the
135 * dirty page counters appropriately. Only called if there is private
136 * data on the page.
137 */
138 static void ceph_invalidatepage(struct page *page, unsigned int offset,
139 unsigned int length)
140 {
141 struct inode *inode;
142 struct ceph_inode_info *ci;
143 struct ceph_snap_context *snapc = page_snap_context(page);
144
145 inode = page->mapping->host;
146 ci = ceph_inode(inode);
147
148 if (offset != 0 || length != PAGE_SIZE) {
149 dout("%p invalidatepage %p idx %lu partial dirty page %u~%u\n",
150 inode, page, page->index, offset, length);
151 return;
152 }
153
154 ceph_invalidate_fscache_page(inode, page);
155
156 WARN_ON(!PageLocked(page));
157 if (!PagePrivate(page))
158 return;
159
160 ClearPageChecked(page);
161
162 dout("%p invalidatepage %p idx %lu full dirty page\n",
163 inode, page, page->index);
164
165 ceph_put_wrbuffer_cap_refs(ci, 1, snapc);
166 ceph_put_snap_context(snapc);
167 page->private = 0;
168 ClearPagePrivate(page);
169 }
170
171 static int ceph_releasepage(struct page *page, gfp_t g)
172 {
173 dout("%p releasepage %p idx %lu (%sdirty)\n", page->mapping->host,
174 page, page->index, PageDirty(page) ? "" : "not ");
175
176 /* Can we release the page from the cache? */
177 if (!ceph_release_fscache_page(page, g))
178 return 0;
179
180 return !PagePrivate(page);
181 }
182
183 /*
184 * read a single page, without unlocking it.
185 */
186 static int ceph_do_readpage(struct file *filp, struct page *page)
187 {
188 struct inode *inode = file_inode(filp);
189 struct ceph_inode_info *ci = ceph_inode(inode);
190 struct ceph_osd_client *osdc =
191 &ceph_inode_to_client(inode)->client->osdc;
192 int err = 0;
193 u64 off = page_offset(page);
194 u64 len = PAGE_SIZE;
195
196 if (off >= i_size_read(inode)) {
197 zero_user_segment(page, 0, PAGE_SIZE);
198 SetPageUptodate(page);
199 return 0;
200 }
201
202 if (ci->i_inline_version != CEPH_INLINE_NONE) {
203 /*
204 * Uptodate inline data should have been added
205 * into page cache while getting Fcr caps.
206 */
207 if (off == 0)
208 return -EINVAL;
209 zero_user_segment(page, 0, PAGE_SIZE);
210 SetPageUptodate(page);
211 return 0;
212 }
213
214 err = ceph_readpage_from_fscache(inode, page);
215 if (err == 0)
216 return -EINPROGRESS;
217
218 dout("readpage inode %p file %p page %p index %lu\n",
219 inode, filp, page, page->index);
220 err = ceph_osdc_readpages(osdc, ceph_vino(inode), &ci->i_layout,
221 off, &len,
222 ci->i_truncate_seq, ci->i_truncate_size,
223 &page, 1, 0);
224 if (err == -ENOENT)
225 err = 0;
226 if (err < 0) {
227 SetPageError(page);
228 ceph_fscache_readpage_cancel(inode, page);
229 goto out;
230 }
231 if (err < PAGE_SIZE)
232 /* zero fill remainder of page */
233 zero_user_segment(page, err, PAGE_SIZE);
234 else
235 flush_dcache_page(page);
236
237 SetPageUptodate(page);
238 ceph_readpage_to_fscache(inode, page);
239
240 out:
241 return err < 0 ? err : 0;
242 }
243
244 static int ceph_readpage(struct file *filp, struct page *page)
245 {
246 int r = ceph_do_readpage(filp, page);
247 if (r != -EINPROGRESS)
248 unlock_page(page);
249 else
250 r = 0;
251 return r;
252 }
253
254 /*
255 * Finish an async read(ahead) op.
256 */
257 static void finish_read(struct ceph_osd_request *req)
258 {
259 struct inode *inode = req->r_inode;
260 struct ceph_osd_data *osd_data;
261 int rc = req->r_result <= 0 ? req->r_result : 0;
262 int bytes = req->r_result >= 0 ? req->r_result : 0;
263 int num_pages;
264 int i;
265
266 dout("finish_read %p req %p rc %d bytes %d\n", inode, req, rc, bytes);
267
268 /* unlock all pages, zeroing any data we didn't read */
269 osd_data = osd_req_op_extent_osd_data(req, 0);
270 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES);
271 num_pages = calc_pages_for((u64)osd_data->alignment,
272 (u64)osd_data->length);
273 for (i = 0; i < num_pages; i++) {
274 struct page *page = osd_data->pages[i];
275
276 if (rc < 0 && rc != -ENOENT) {
277 ceph_fscache_readpage_cancel(inode, page);
278 goto unlock;
279 }
280 if (bytes < (int)PAGE_SIZE) {
281 /* zero (remainder of) page */
282 int s = bytes < 0 ? 0 : bytes;
283 zero_user_segment(page, s, PAGE_SIZE);
284 }
285 dout("finish_read %p uptodate %p idx %lu\n", inode, page,
286 page->index);
287 flush_dcache_page(page);
288 SetPageUptodate(page);
289 ceph_readpage_to_fscache(inode, page);
290 unlock:
291 unlock_page(page);
292 put_page(page);
293 bytes -= PAGE_SIZE;
294 }
295 kfree(osd_data->pages);
296 }
297
298 /*
299 * start an async read(ahead) operation. return nr_pages we submitted
300 * a read for on success, or negative error code.
301 */
302 static int start_read(struct inode *inode, struct list_head *page_list, int max)
303 {
304 struct ceph_osd_client *osdc =
305 &ceph_inode_to_client(inode)->client->osdc;
306 struct ceph_inode_info *ci = ceph_inode(inode);
307 struct page *page = list_entry(page_list->prev, struct page, lru);
308 struct ceph_vino vino;
309 struct ceph_osd_request *req;
310 u64 off;
311 u64 len;
312 int i;
313 struct page **pages;
314 pgoff_t next_index;
315 int nr_pages = 0;
316 int got = 0;
317 int ret = 0;
318
319 if (!current->journal_info) {
320 /* caller of readpages does not hold buffer and read caps
321 * (fadvise, madvise and readahead cases) */
322 int want = CEPH_CAP_FILE_CACHE;
323 ret = ceph_try_get_caps(ci, CEPH_CAP_FILE_RD, want, &got);
324 if (ret < 0) {
325 dout("start_read %p, error getting cap\n", inode);
326 } else if (!(got & want)) {
327 dout("start_read %p, no cache cap\n", inode);
328 ret = 0;
329 }
330 if (ret <= 0) {
331 if (got)
332 ceph_put_cap_refs(ci, got);
333 while (!list_empty(page_list)) {
334 page = list_entry(page_list->prev,
335 struct page, lru);
336 list_del(&page->lru);
337 put_page(page);
338 }
339 return ret;
340 }
341 }
342
343 off = (u64) page_offset(page);
344
345 /* count pages */
346 next_index = page->index;
347 list_for_each_entry_reverse(page, page_list, lru) {
348 if (page->index != next_index)
349 break;
350 nr_pages++;
351 next_index++;
352 if (max && nr_pages == max)
353 break;
354 }
355 len = nr_pages << PAGE_SHIFT;
356 dout("start_read %p nr_pages %d is %lld~%lld\n", inode, nr_pages,
357 off, len);
358 vino = ceph_vino(inode);
359 req = ceph_osdc_new_request(osdc, &ci->i_layout, vino, off, &len,
360 0, 1, CEPH_OSD_OP_READ,
361 CEPH_OSD_FLAG_READ, NULL,
362 ci->i_truncate_seq, ci->i_truncate_size,
363 false);
364 if (IS_ERR(req)) {
365 ret = PTR_ERR(req);
366 goto out;
367 }
368
369 /* build page vector */
370 nr_pages = calc_pages_for(0, len);
371 pages = kmalloc(sizeof(*pages) * nr_pages, GFP_KERNEL);
372 if (!pages) {
373 ret = -ENOMEM;
374 goto out_put;
375 }
376 for (i = 0; i < nr_pages; ++i) {
377 page = list_entry(page_list->prev, struct page, lru);
378 BUG_ON(PageLocked(page));
379 list_del(&page->lru);
380
381 dout("start_read %p adding %p idx %lu\n", inode, page,
382 page->index);
383 if (add_to_page_cache_lru(page, &inode->i_data, page->index,
384 GFP_KERNEL)) {
385 ceph_fscache_uncache_page(inode, page);
386 put_page(page);
387 dout("start_read %p add_to_page_cache failed %p\n",
388 inode, page);
389 nr_pages = i;
390 if (nr_pages > 0) {
391 len = nr_pages << PAGE_SHIFT;
392 osd_req_op_extent_update(req, 0, len);
393 break;
394 }
395 goto out_pages;
396 }
397 pages[i] = page;
398 }
399 osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0, false, false);
400 req->r_callback = finish_read;
401 req->r_inode = inode;
402
403 dout("start_read %p starting %p %lld~%lld\n", inode, req, off, len);
404 ret = ceph_osdc_start_request(osdc, req, false);
405 if (ret < 0)
406 goto out_pages;
407 ceph_osdc_put_request(req);
408
409 /* After adding locked pages to page cache, the inode holds cache cap.
410 * So we can drop our cap refs. */
411 if (got)
412 ceph_put_cap_refs(ci, got);
413
414 return nr_pages;
415
416 out_pages:
417 for (i = 0; i < nr_pages; ++i) {
418 ceph_fscache_readpage_cancel(inode, pages[i]);
419 unlock_page(pages[i]);
420 }
421 ceph_put_page_vector(pages, nr_pages, false);
422 out_put:
423 ceph_osdc_put_request(req);
424 out:
425 if (got)
426 ceph_put_cap_refs(ci, got);
427 return ret;
428 }
429
430
431 /*
432 * Read multiple pages. Leave pages we don't read + unlock in page_list;
433 * the caller (VM) cleans them up.
434 */
435 static int ceph_readpages(struct file *file, struct address_space *mapping,
436 struct list_head *page_list, unsigned nr_pages)
437 {
438 struct inode *inode = file_inode(file);
439 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
440 int rc = 0;
441 int max = 0;
442
443 if (ceph_inode(inode)->i_inline_version != CEPH_INLINE_NONE)
444 return -EINVAL;
445
446 rc = ceph_readpages_from_fscache(mapping->host, mapping, page_list,
447 &nr_pages);
448
449 if (rc == 0)
450 goto out;
451
452 max = fsc->mount_options->rsize >> PAGE_SHIFT;
453 dout("readpages %p file %p nr_pages %d max %d\n",
454 inode, file, nr_pages, max);
455 while (!list_empty(page_list)) {
456 rc = start_read(inode, page_list, max);
457 if (rc < 0)
458 goto out;
459 }
460 out:
461 ceph_fscache_readpages_cancel(inode, page_list);
462
463 dout("readpages %p file %p ret %d\n", inode, file, rc);
464 return rc;
465 }
466
467 struct ceph_writeback_ctl
468 {
469 loff_t i_size;
470 u64 truncate_size;
471 u32 truncate_seq;
472 bool size_stable;
473 bool head_snapc;
474 };
475
476 /*
477 * Get ref for the oldest snapc for an inode with dirty data... that is, the
478 * only snap context we are allowed to write back.
479 */
480 static struct ceph_snap_context *
481 get_oldest_context(struct inode *inode, struct ceph_writeback_ctl *ctl,
482 struct ceph_snap_context *page_snapc)
483 {
484 struct ceph_inode_info *ci = ceph_inode(inode);
485 struct ceph_snap_context *snapc = NULL;
486 struct ceph_cap_snap *capsnap = NULL;
487
488 spin_lock(&ci->i_ceph_lock);
489 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
490 dout(" cap_snap %p snapc %p has %d dirty pages\n", capsnap,
491 capsnap->context, capsnap->dirty_pages);
492 if (!capsnap->dirty_pages)
493 continue;
494
495 /* get i_size, truncate_{seq,size} for page_snapc? */
496 if (snapc && capsnap->context != page_snapc)
497 continue;
498
499 if (ctl) {
500 if (capsnap->writing) {
501 ctl->i_size = i_size_read(inode);
502 ctl->size_stable = false;
503 } else {
504 ctl->i_size = capsnap->size;
505 ctl->size_stable = true;
506 }
507 ctl->truncate_size = capsnap->truncate_size;
508 ctl->truncate_seq = capsnap->truncate_seq;
509 ctl->head_snapc = false;
510 }
511
512 if (snapc)
513 break;
514
515 snapc = ceph_get_snap_context(capsnap->context);
516 if (!page_snapc ||
517 page_snapc == snapc ||
518 page_snapc->seq > snapc->seq)
519 break;
520 }
521 if (!snapc && ci->i_wrbuffer_ref_head) {
522 snapc = ceph_get_snap_context(ci->i_head_snapc);
523 dout(" head snapc %p has %d dirty pages\n",
524 snapc, ci->i_wrbuffer_ref_head);
525 if (ctl) {
526 ctl->i_size = i_size_read(inode);
527 ctl->truncate_size = ci->i_truncate_size;
528 ctl->truncate_seq = ci->i_truncate_seq;
529 ctl->size_stable = false;
530 ctl->head_snapc = true;
531 }
532 }
533 spin_unlock(&ci->i_ceph_lock);
534 return snapc;
535 }
536
537 static u64 get_writepages_data_length(struct inode *inode,
538 struct page *page, u64 start)
539 {
540 struct ceph_inode_info *ci = ceph_inode(inode);
541 struct ceph_snap_context *snapc = page_snap_context(page);
542 struct ceph_cap_snap *capsnap = NULL;
543 u64 end = i_size_read(inode);
544
545 if (snapc != ci->i_head_snapc) {
546 bool found = false;
547 spin_lock(&ci->i_ceph_lock);
548 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
549 if (capsnap->context == snapc) {
550 if (!capsnap->writing)
551 end = capsnap->size;
552 found = true;
553 break;
554 }
555 }
556 spin_unlock(&ci->i_ceph_lock);
557 WARN_ON(!found);
558 }
559 if (end > page_offset(page) + PAGE_SIZE)
560 end = page_offset(page) + PAGE_SIZE;
561 return end > start ? end - start : 0;
562 }
563
564 /*
565 * Write a single page, but leave the page locked.
566 *
567 * If we get a write error, set the page error bit, but still adjust the
568 * dirty page accounting (i.e., page is no longer dirty).
569 */
570 static int writepage_nounlock(struct page *page, struct writeback_control *wbc)
571 {
572 struct inode *inode;
573 struct ceph_inode_info *ci;
574 struct ceph_fs_client *fsc;
575 struct ceph_snap_context *snapc, *oldest;
576 loff_t page_off = page_offset(page);
577 long writeback_stat;
578 int err, len = PAGE_SIZE;
579 struct ceph_writeback_ctl ceph_wbc;
580
581 dout("writepage %p idx %lu\n", page, page->index);
582
583 inode = page->mapping->host;
584 ci = ceph_inode(inode);
585 fsc = ceph_inode_to_client(inode);
586
587 /* verify this is a writeable snap context */
588 snapc = page_snap_context(page);
589 if (!snapc) {
590 dout("writepage %p page %p not dirty?\n", inode, page);
591 return 0;
592 }
593 oldest = get_oldest_context(inode, &ceph_wbc, snapc);
594 if (snapc->seq > oldest->seq) {
595 dout("writepage %p page %p snapc %p not writeable - noop\n",
596 inode, page, snapc);
597 /* we should only noop if called by kswapd */
598 WARN_ON(!(current->flags & PF_MEMALLOC));
599 ceph_put_snap_context(oldest);
600 redirty_page_for_writepage(wbc, page);
601 return 0;
602 }
603 ceph_put_snap_context(oldest);
604
605 /* is this a partial page at end of file? */
606 if (page_off >= ceph_wbc.i_size) {
607 dout("%p page eof %llu\n", page, ceph_wbc.i_size);
608 page->mapping->a_ops->invalidatepage(page, 0, PAGE_SIZE);
609 return 0;
610 }
611
612 if (ceph_wbc.i_size < page_off + len)
613 len = ceph_wbc.i_size - page_off;
614
615 dout("writepage %p page %p index %lu on %llu~%u snapc %p seq %lld\n",
616 inode, page, page->index, page_off, len, snapc, snapc->seq);
617
618 writeback_stat = atomic_long_inc_return(&fsc->writeback_count);
619 if (writeback_stat >
620 CONGESTION_ON_THRESH(fsc->mount_options->congestion_kb))
621 set_bdi_congested(inode_to_bdi(inode), BLK_RW_ASYNC);
622
623 set_page_writeback(page);
624 err = ceph_osdc_writepages(&fsc->client->osdc, ceph_vino(inode),
625 &ci->i_layout, snapc, page_off, len,
626 ceph_wbc.truncate_seq,
627 ceph_wbc.truncate_size,
628 &inode->i_mtime, &page, 1);
629 if (err < 0) {
630 struct writeback_control tmp_wbc;
631 if (!wbc)
632 wbc = &tmp_wbc;
633 if (err == -ERESTARTSYS) {
634 /* killed by SIGKILL */
635 dout("writepage interrupted page %p\n", page);
636 redirty_page_for_writepage(wbc, page);
637 end_page_writeback(page);
638 return err;
639 }
640 dout("writepage setting page/mapping error %d %p\n",
641 err, page);
642 SetPageError(page);
643 mapping_set_error(&inode->i_data, err);
644 wbc->pages_skipped++;
645 } else {
646 dout("writepage cleaned page %p\n", page);
647 err = 0; /* vfs expects us to return 0 */
648 }
649 page->private = 0;
650 ClearPagePrivate(page);
651 end_page_writeback(page);
652 ceph_put_wrbuffer_cap_refs(ci, 1, snapc);
653 ceph_put_snap_context(snapc); /* page's reference */
654 return err;
655 }
656
657 static int ceph_writepage(struct page *page, struct writeback_control *wbc)
658 {
659 int err;
660 struct inode *inode = page->mapping->host;
661 BUG_ON(!inode);
662 ihold(inode);
663 err = writepage_nounlock(page, wbc);
664 if (err == -ERESTARTSYS) {
665 /* direct memory reclaimer was killed by SIGKILL. return 0
666 * to prevent caller from setting mapping/page error */
667 err = 0;
668 }
669 unlock_page(page);
670 iput(inode);
671 return err;
672 }
673
674 /*
675 * lame release_pages helper. release_pages() isn't exported to
676 * modules.
677 */
678 static void ceph_release_pages(struct page **pages, int num)
679 {
680 struct pagevec pvec;
681 int i;
682
683 pagevec_init(&pvec);
684 for (i = 0; i < num; i++) {
685 if (pagevec_add(&pvec, pages[i]) == 0)
686 pagevec_release(&pvec);
687 }
688 pagevec_release(&pvec);
689 }
690
691 /*
692 * async writeback completion handler.
693 *
694 * If we get an error, set the mapping error bit, but not the individual
695 * page error bits.
696 */
697 static void writepages_finish(struct ceph_osd_request *req)
698 {
699 struct inode *inode = req->r_inode;
700 struct ceph_inode_info *ci = ceph_inode(inode);
701 struct ceph_osd_data *osd_data;
702 struct page *page;
703 int num_pages, total_pages = 0;
704 int i, j;
705 int rc = req->r_result;
706 struct ceph_snap_context *snapc = req->r_snapc;
707 struct address_space *mapping = inode->i_mapping;
708 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
709 bool remove_page;
710
711 dout("writepages_finish %p rc %d\n", inode, rc);
712 if (rc < 0) {
713 mapping_set_error(mapping, rc);
714 ceph_set_error_write(ci);
715 } else {
716 ceph_clear_error_write(ci);
717 }
718
719 /*
720 * We lost the cache cap, need to truncate the page before
721 * it is unlocked, otherwise we'd truncate it later in the
722 * page truncation thread, possibly losing some data that
723 * raced its way in
724 */
725 remove_page = !(ceph_caps_issued(ci) &
726 (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO));
727
728 /* clean all pages */
729 for (i = 0; i < req->r_num_ops; i++) {
730 if (req->r_ops[i].op != CEPH_OSD_OP_WRITE)
731 break;
732
733 osd_data = osd_req_op_extent_osd_data(req, i);
734 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES);
735 num_pages = calc_pages_for((u64)osd_data->alignment,
736 (u64)osd_data->length);
737 total_pages += num_pages;
738 for (j = 0; j < num_pages; j++) {
739 page = osd_data->pages[j];
740 BUG_ON(!page);
741 WARN_ON(!PageUptodate(page));
742
743 if (atomic_long_dec_return(&fsc->writeback_count) <
744 CONGESTION_OFF_THRESH(
745 fsc->mount_options->congestion_kb))
746 clear_bdi_congested(inode_to_bdi(inode),
747 BLK_RW_ASYNC);
748
749 ceph_put_snap_context(page_snap_context(page));
750 page->private = 0;
751 ClearPagePrivate(page);
752 dout("unlocking %p\n", page);
753 end_page_writeback(page);
754
755 if (remove_page)
756 generic_error_remove_page(inode->i_mapping,
757 page);
758
759 unlock_page(page);
760 }
761 dout("writepages_finish %p wrote %llu bytes cleaned %d pages\n",
762 inode, osd_data->length, rc >= 0 ? num_pages : 0);
763
764 ceph_release_pages(osd_data->pages, num_pages);
765 }
766
767 ceph_put_wrbuffer_cap_refs(ci, total_pages, snapc);
768
769 osd_data = osd_req_op_extent_osd_data(req, 0);
770 if (osd_data->pages_from_pool)
771 mempool_free(osd_data->pages,
772 ceph_sb_to_client(inode->i_sb)->wb_pagevec_pool);
773 else
774 kfree(osd_data->pages);
775 ceph_osdc_put_request(req);
776 }
777
778 /*
779 * initiate async writeback
780 */
781 static int ceph_writepages_start(struct address_space *mapping,
782 struct writeback_control *wbc)
783 {
784 struct inode *inode = mapping->host;
785 struct ceph_inode_info *ci = ceph_inode(inode);
786 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
787 struct ceph_vino vino = ceph_vino(inode);
788 pgoff_t index, start_index, end = -1;
789 struct ceph_snap_context *snapc = NULL, *last_snapc = NULL, *pgsnapc;
790 struct pagevec pvec;
791 int rc = 0;
792 unsigned int wsize = i_blocksize(inode);
793 struct ceph_osd_request *req = NULL;
794 struct ceph_writeback_ctl ceph_wbc;
795 bool should_loop, range_whole = false;
796 bool stop, done = false;
797
798 dout("writepages_start %p (mode=%s)\n", inode,
799 wbc->sync_mode == WB_SYNC_NONE ? "NONE" :
800 (wbc->sync_mode == WB_SYNC_ALL ? "ALL" : "HOLD"));
801
802 if (READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
803 if (ci->i_wrbuffer_ref > 0) {
804 pr_warn_ratelimited(
805 "writepage_start %p %lld forced umount\n",
806 inode, ceph_ino(inode));
807 }
808 mapping_set_error(mapping, -EIO);
809 return -EIO; /* we're in a forced umount, don't write! */
810 }
811 if (fsc->mount_options->wsize < wsize)
812 wsize = fsc->mount_options->wsize;
813
814 pagevec_init(&pvec);
815
816 start_index = wbc->range_cyclic ? mapping->writeback_index : 0;
817 index = start_index;
818
819 retry:
820 /* find oldest snap context with dirty data */
821 snapc = get_oldest_context(inode, &ceph_wbc, NULL);
822 if (!snapc) {
823 /* hmm, why does writepages get called when there
824 is no dirty data? */
825 dout(" no snap context with dirty data?\n");
826 goto out;
827 }
828 dout(" oldest snapc is %p seq %lld (%d snaps)\n",
829 snapc, snapc->seq, snapc->num_snaps);
830
831 should_loop = false;
832 if (ceph_wbc.head_snapc && snapc != last_snapc) {
833 /* where to start/end? */
834 if (wbc->range_cyclic) {
835 index = start_index;
836 end = -1;
837 if (index > 0)
838 should_loop = true;
839 dout(" cyclic, start at %lu\n", index);
840 } else {
841 index = wbc->range_start >> PAGE_SHIFT;
842 end = wbc->range_end >> PAGE_SHIFT;
843 if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
844 range_whole = true;
845 dout(" not cyclic, %lu to %lu\n", index, end);
846 }
847 } else if (!ceph_wbc.head_snapc) {
848 /* Do not respect wbc->range_{start,end}. Dirty pages
849 * in that range can be associated with newer snapc.
850 * They are not writeable until we write all dirty pages
851 * associated with 'snapc' get written */
852 if (index > 0 || wbc->sync_mode != WB_SYNC_NONE)
853 should_loop = true;
854 dout(" non-head snapc, range whole\n");
855 }
856
857 ceph_put_snap_context(last_snapc);
858 last_snapc = snapc;
859
860 stop = false;
861 while (!stop && index <= end) {
862 int num_ops = 0, op_idx;
863 unsigned i, pvec_pages, max_pages, locked_pages = 0;
864 struct page **pages = NULL, **data_pages;
865 mempool_t *pool = NULL; /* Becomes non-null if mempool used */
866 struct page *page;
867 pgoff_t strip_unit_end = 0;
868 u64 offset = 0, len = 0;
869
870 max_pages = wsize >> PAGE_SHIFT;
871
872 get_more_pages:
873 pvec_pages = pagevec_lookup_range_nr_tag(&pvec, mapping, &index,
874 end, PAGECACHE_TAG_DIRTY,
875 max_pages - locked_pages);
876 dout("pagevec_lookup_range_tag got %d\n", pvec_pages);
877 if (!pvec_pages && !locked_pages)
878 break;
879 for (i = 0; i < pvec_pages && locked_pages < max_pages; i++) {
880 page = pvec.pages[i];
881 dout("? %p idx %lu\n", page, page->index);
882 if (locked_pages == 0)
883 lock_page(page); /* first page */
884 else if (!trylock_page(page))
885 break;
886
887 /* only dirty pages, or our accounting breaks */
888 if (unlikely(!PageDirty(page)) ||
889 unlikely(page->mapping != mapping)) {
890 dout("!dirty or !mapping %p\n", page);
891 unlock_page(page);
892 continue;
893 }
894 if (strip_unit_end && (page->index > strip_unit_end)) {
895 dout("end of strip unit %p\n", page);
896 unlock_page(page);
897 break;
898 }
899 if (page_offset(page) >= ceph_wbc.i_size) {
900 dout("%p page eof %llu\n",
901 page, ceph_wbc.i_size);
902 /* not done if range_cyclic */
903 stop = true;
904 unlock_page(page);
905 break;
906 }
907 if (PageWriteback(page)) {
908 if (wbc->sync_mode == WB_SYNC_NONE) {
909 dout("%p under writeback\n", page);
910 unlock_page(page);
911 continue;
912 }
913 dout("waiting on writeback %p\n", page);
914 wait_on_page_writeback(page);
915 }
916
917 /* only if matching snap context */
918 pgsnapc = page_snap_context(page);
919 if (pgsnapc != snapc) {
920 dout("page snapc %p %lld != oldest %p %lld\n",
921 pgsnapc, pgsnapc->seq, snapc, snapc->seq);
922 unlock_page(page);
923 continue;
924 }
925
926 if (!clear_page_dirty_for_io(page)) {
927 dout("%p !clear_page_dirty_for_io\n", page);
928 unlock_page(page);
929 continue;
930 }
931
932 /*
933 * We have something to write. If this is
934 * the first locked page this time through,
935 * calculate max possinle write size and
936 * allocate a page array
937 */
938 if (locked_pages == 0) {
939 u64 objnum;
940 u64 objoff;
941
942 /* prepare async write request */
943 offset = (u64)page_offset(page);
944 len = wsize;
945
946 rc = ceph_calc_file_object_mapping(&ci->i_layout,
947 offset, len,
948 &objnum, &objoff,
949 &len);
950 if (rc < 0) {
951 unlock_page(page);
952 break;
953 }
954
955 num_ops = 1;
956 strip_unit_end = page->index +
957 ((len - 1) >> PAGE_SHIFT);
958
959 BUG_ON(pages);
960 max_pages = calc_pages_for(0, (u64)len);
961 pages = kmalloc(max_pages * sizeof (*pages),
962 GFP_NOFS);
963 if (!pages) {
964 pool = fsc->wb_pagevec_pool;
965 pages = mempool_alloc(pool, GFP_NOFS);
966 BUG_ON(!pages);
967 }
968
969 len = 0;
970 } else if (page->index !=
971 (offset + len) >> PAGE_SHIFT) {
972 if (num_ops >= (pool ? CEPH_OSD_SLAB_OPS :
973 CEPH_OSD_MAX_OPS)) {
974 redirty_page_for_writepage(wbc, page);
975 unlock_page(page);
976 break;
977 }
978
979 num_ops++;
980 offset = (u64)page_offset(page);
981 len = 0;
982 }
983
984 /* note position of first page in pvec */
985 dout("%p will write page %p idx %lu\n",
986 inode, page, page->index);
987
988 if (atomic_long_inc_return(&fsc->writeback_count) >
989 CONGESTION_ON_THRESH(
990 fsc->mount_options->congestion_kb)) {
991 set_bdi_congested(inode_to_bdi(inode),
992 BLK_RW_ASYNC);
993 }
994
995
996 pages[locked_pages++] = page;
997 pvec.pages[i] = NULL;
998
999 len += PAGE_SIZE;
1000 }
1001
1002 /* did we get anything? */
1003 if (!locked_pages)
1004 goto release_pvec_pages;
1005 if (i) {
1006 unsigned j, n = 0;
1007 /* shift unused page to beginning of pvec */
1008 for (j = 0; j < pvec_pages; j++) {
1009 if (!pvec.pages[j])
1010 continue;
1011 if (n < j)
1012 pvec.pages[n] = pvec.pages[j];
1013 n++;
1014 }
1015 pvec.nr = n;
1016
1017 if (pvec_pages && i == pvec_pages &&
1018 locked_pages < max_pages) {
1019 dout("reached end pvec, trying for more\n");
1020 pagevec_release(&pvec);
1021 goto get_more_pages;
1022 }
1023 }
1024
1025 new_request:
1026 offset = page_offset(pages[0]);
1027 len = wsize;
1028
1029 req = ceph_osdc_new_request(&fsc->client->osdc,
1030 &ci->i_layout, vino,
1031 offset, &len, 0, num_ops,
1032 CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE,
1033 snapc, ceph_wbc.truncate_seq,
1034 ceph_wbc.truncate_size, false);
1035 if (IS_ERR(req)) {
1036 req = ceph_osdc_new_request(&fsc->client->osdc,
1037 &ci->i_layout, vino,
1038 offset, &len, 0,
1039 min(num_ops,
1040 CEPH_OSD_SLAB_OPS),
1041 CEPH_OSD_OP_WRITE,
1042 CEPH_OSD_FLAG_WRITE,
1043 snapc, ceph_wbc.truncate_seq,
1044 ceph_wbc.truncate_size, true);
1045 BUG_ON(IS_ERR(req));
1046 }
1047 BUG_ON(len < page_offset(pages[locked_pages - 1]) +
1048 PAGE_SIZE - offset);
1049
1050 req->r_callback = writepages_finish;
1051 req->r_inode = inode;
1052
1053 /* Format the osd request message and submit the write */
1054 len = 0;
1055 data_pages = pages;
1056 op_idx = 0;
1057 for (i = 0; i < locked_pages; i++) {
1058 u64 cur_offset = page_offset(pages[i]);
1059 if (offset + len != cur_offset) {
1060 if (op_idx + 1 == req->r_num_ops)
1061 break;
1062 osd_req_op_extent_dup_last(req, op_idx,
1063 cur_offset - offset);
1064 dout("writepages got pages at %llu~%llu\n",
1065 offset, len);
1066 osd_req_op_extent_osd_data_pages(req, op_idx,
1067 data_pages, len, 0,
1068 !!pool, false);
1069 osd_req_op_extent_update(req, op_idx, len);
1070
1071 len = 0;
1072 offset = cur_offset;
1073 data_pages = pages + i;
1074 op_idx++;
1075 }
1076
1077 set_page_writeback(pages[i]);
1078 len += PAGE_SIZE;
1079 }
1080
1081 if (ceph_wbc.size_stable) {
1082 len = min(len, ceph_wbc.i_size - offset);
1083 } else if (i == locked_pages) {
1084 /* writepages_finish() clears writeback pages
1085 * according to the data length, so make sure
1086 * data length covers all locked pages */
1087 u64 min_len = len + 1 - PAGE_SIZE;
1088 len = get_writepages_data_length(inode, pages[i - 1],
1089 offset);
1090 len = max(len, min_len);
1091 }
1092 dout("writepages got pages at %llu~%llu\n", offset, len);
1093
1094 osd_req_op_extent_osd_data_pages(req, op_idx, data_pages, len,
1095 0, !!pool, false);
1096 osd_req_op_extent_update(req, op_idx, len);
1097
1098 BUG_ON(op_idx + 1 != req->r_num_ops);
1099
1100 pool = NULL;
1101 if (i < locked_pages) {
1102 BUG_ON(num_ops <= req->r_num_ops);
1103 num_ops -= req->r_num_ops;
1104 locked_pages -= i;
1105
1106 /* allocate new pages array for next request */
1107 data_pages = pages;
1108 pages = kmalloc(locked_pages * sizeof (*pages),
1109 GFP_NOFS);
1110 if (!pages) {
1111 pool = fsc->wb_pagevec_pool;
1112 pages = mempool_alloc(pool, GFP_NOFS);
1113 BUG_ON(!pages);
1114 }
1115 memcpy(pages, data_pages + i,
1116 locked_pages * sizeof(*pages));
1117 memset(data_pages + i, 0,
1118 locked_pages * sizeof(*pages));
1119 } else {
1120 BUG_ON(num_ops != req->r_num_ops);
1121 index = pages[i - 1]->index + 1;
1122 /* request message now owns the pages array */
1123 pages = NULL;
1124 }
1125
1126 req->r_mtime = inode->i_mtime;
1127 rc = ceph_osdc_start_request(&fsc->client->osdc, req, true);
1128 BUG_ON(rc);
1129 req = NULL;
1130
1131 wbc->nr_to_write -= i;
1132 if (pages)
1133 goto new_request;
1134
1135 /*
1136 * We stop writing back only if we are not doing
1137 * integrity sync. In case of integrity sync we have to
1138 * keep going until we have written all the pages
1139 * we tagged for writeback prior to entering this loop.
1140 */
1141 if (wbc->nr_to_write <= 0 && wbc->sync_mode == WB_SYNC_NONE)
1142 done = stop = true;
1143
1144 release_pvec_pages:
1145 dout("pagevec_release on %d pages (%p)\n", (int)pvec.nr,
1146 pvec.nr ? pvec.pages[0] : NULL);
1147 pagevec_release(&pvec);
1148 }
1149
1150 if (should_loop && !done) {
1151 /* more to do; loop back to beginning of file */
1152 dout("writepages looping back to beginning of file\n");
1153 end = start_index - 1; /* OK even when start_index == 0 */
1154
1155 /* to write dirty pages associated with next snapc,
1156 * we need to wait until current writes complete */
1157 if (wbc->sync_mode != WB_SYNC_NONE &&
1158 start_index == 0 && /* all dirty pages were checked */
1159 !ceph_wbc.head_snapc) {
1160 struct page *page;
1161 unsigned i, nr;
1162 index = 0;
1163 while ((index <= end) &&
1164 (nr = pagevec_lookup_tag(&pvec, mapping, &index,
1165 PAGECACHE_TAG_WRITEBACK))) {
1166 for (i = 0; i < nr; i++) {
1167 page = pvec.pages[i];
1168 if (page_snap_context(page) != snapc)
1169 continue;
1170 wait_on_page_writeback(page);
1171 }
1172 pagevec_release(&pvec);
1173 cond_resched();
1174 }
1175 }
1176
1177 start_index = 0;
1178 index = 0;
1179 goto retry;
1180 }
1181
1182 if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
1183 mapping->writeback_index = index;
1184
1185 out:
1186 ceph_osdc_put_request(req);
1187 ceph_put_snap_context(last_snapc);
1188 dout("writepages dend - startone, rc = %d\n", rc);
1189 return rc;
1190 }
1191
1192
1193
1194 /*
1195 * See if a given @snapc is either writeable, or already written.
1196 */
1197 static int context_is_writeable_or_written(struct inode *inode,
1198 struct ceph_snap_context *snapc)
1199 {
1200 struct ceph_snap_context *oldest = get_oldest_context(inode, NULL, NULL);
1201 int ret = !oldest || snapc->seq <= oldest->seq;
1202
1203 ceph_put_snap_context(oldest);
1204 return ret;
1205 }
1206
1207 /*
1208 * We are only allowed to write into/dirty the page if the page is
1209 * clean, or already dirty within the same snap context.
1210 *
1211 * called with page locked.
1212 * return success with page locked,
1213 * or any failure (incl -EAGAIN) with page unlocked.
1214 */
1215 static int ceph_update_writeable_page(struct file *file,
1216 loff_t pos, unsigned len,
1217 struct page *page)
1218 {
1219 struct inode *inode = file_inode(file);
1220 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1221 struct ceph_inode_info *ci = ceph_inode(inode);
1222 loff_t page_off = pos & PAGE_MASK;
1223 int pos_in_page = pos & ~PAGE_MASK;
1224 int end_in_page = pos_in_page + len;
1225 loff_t i_size;
1226 int r;
1227 struct ceph_snap_context *snapc, *oldest;
1228
1229 if (READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
1230 dout(" page %p forced umount\n", page);
1231 unlock_page(page);
1232 return -EIO;
1233 }
1234
1235 retry_locked:
1236 /* writepages currently holds page lock, but if we change that later, */
1237 wait_on_page_writeback(page);
1238
1239 snapc = page_snap_context(page);
1240 if (snapc && snapc != ci->i_head_snapc) {
1241 /*
1242 * this page is already dirty in another (older) snap
1243 * context! is it writeable now?
1244 */
1245 oldest = get_oldest_context(inode, NULL, NULL);
1246 if (snapc->seq > oldest->seq) {
1247 ceph_put_snap_context(oldest);
1248 dout(" page %p snapc %p not current or oldest\n",
1249 page, snapc);
1250 /*
1251 * queue for writeback, and wait for snapc to
1252 * be writeable or written
1253 */
1254 snapc = ceph_get_snap_context(snapc);
1255 unlock_page(page);
1256 ceph_queue_writeback(inode);
1257 r = wait_event_killable(ci->i_cap_wq,
1258 context_is_writeable_or_written(inode, snapc));
1259 ceph_put_snap_context(snapc);
1260 if (r == -ERESTARTSYS)
1261 return r;
1262 return -EAGAIN;
1263 }
1264 ceph_put_snap_context(oldest);
1265
1266 /* yay, writeable, do it now (without dropping page lock) */
1267 dout(" page %p snapc %p not current, but oldest\n",
1268 page, snapc);
1269 if (!clear_page_dirty_for_io(page))
1270 goto retry_locked;
1271 r = writepage_nounlock(page, NULL);
1272 if (r < 0)
1273 goto fail_unlock;
1274 goto retry_locked;
1275 }
1276
1277 if (PageUptodate(page)) {
1278 dout(" page %p already uptodate\n", page);
1279 return 0;
1280 }
1281
1282 /* full page? */
1283 if (pos_in_page == 0 && len == PAGE_SIZE)
1284 return 0;
1285
1286 /* past end of file? */
1287 i_size = i_size_read(inode);
1288
1289 if (page_off >= i_size ||
1290 (pos_in_page == 0 && (pos+len) >= i_size &&
1291 end_in_page - pos_in_page != PAGE_SIZE)) {
1292 dout(" zeroing %p 0 - %d and %d - %d\n",
1293 page, pos_in_page, end_in_page, (int)PAGE_SIZE);
1294 zero_user_segments(page,
1295 0, pos_in_page,
1296 end_in_page, PAGE_SIZE);
1297 return 0;
1298 }
1299
1300 /* we need to read it. */
1301 r = ceph_do_readpage(file, page);
1302 if (r < 0) {
1303 if (r == -EINPROGRESS)
1304 return -EAGAIN;
1305 goto fail_unlock;
1306 }
1307 goto retry_locked;
1308 fail_unlock:
1309 unlock_page(page);
1310 return r;
1311 }
1312
1313 /*
1314 * We are only allowed to write into/dirty the page if the page is
1315 * clean, or already dirty within the same snap context.
1316 */
1317 static int ceph_write_begin(struct file *file, struct address_space *mapping,
1318 loff_t pos, unsigned len, unsigned flags,
1319 struct page **pagep, void **fsdata)
1320 {
1321 struct inode *inode = file_inode(file);
1322 struct page *page;
1323 pgoff_t index = pos >> PAGE_SHIFT;
1324 int r;
1325
1326 do {
1327 /* get a page */
1328 page = grab_cache_page_write_begin(mapping, index, 0);
1329 if (!page)
1330 return -ENOMEM;
1331
1332 dout("write_begin file %p inode %p page %p %d~%d\n", file,
1333 inode, page, (int)pos, (int)len);
1334
1335 r = ceph_update_writeable_page(file, pos, len, page);
1336 if (r < 0)
1337 put_page(page);
1338 else
1339 *pagep = page;
1340 } while (r == -EAGAIN);
1341
1342 return r;
1343 }
1344
1345 /*
1346 * we don't do anything in here that simple_write_end doesn't do
1347 * except adjust dirty page accounting
1348 */
1349 static int ceph_write_end(struct file *file, struct address_space *mapping,
1350 loff_t pos, unsigned len, unsigned copied,
1351 struct page *page, void *fsdata)
1352 {
1353 struct inode *inode = file_inode(file);
1354 bool check_cap = false;
1355
1356 dout("write_end file %p inode %p page %p %d~%d (%d)\n", file,
1357 inode, page, (int)pos, (int)copied, (int)len);
1358
1359 /* zero the stale part of the page if we did a short copy */
1360 if (!PageUptodate(page)) {
1361 if (copied < len) {
1362 copied = 0;
1363 goto out;
1364 }
1365 SetPageUptodate(page);
1366 }
1367
1368 /* did file size increase? */
1369 if (pos+copied > i_size_read(inode))
1370 check_cap = ceph_inode_set_size(inode, pos+copied);
1371
1372 set_page_dirty(page);
1373
1374 out:
1375 unlock_page(page);
1376 put_page(page);
1377
1378 if (check_cap)
1379 ceph_check_caps(ceph_inode(inode), CHECK_CAPS_AUTHONLY, NULL);
1380
1381 return copied;
1382 }
1383
1384 /*
1385 * we set .direct_IO to indicate direct io is supported, but since we
1386 * intercept O_DIRECT reads and writes early, this function should
1387 * never get called.
1388 */
1389 static ssize_t ceph_direct_io(struct kiocb *iocb, struct iov_iter *iter)
1390 {
1391 WARN_ON(1);
1392 return -EINVAL;
1393 }
1394
1395 const struct address_space_operations ceph_aops = {
1396 .readpage = ceph_readpage,
1397 .readpages = ceph_readpages,
1398 .writepage = ceph_writepage,
1399 .writepages = ceph_writepages_start,
1400 .write_begin = ceph_write_begin,
1401 .write_end = ceph_write_end,
1402 .set_page_dirty = ceph_set_page_dirty,
1403 .invalidatepage = ceph_invalidatepage,
1404 .releasepage = ceph_releasepage,
1405 .direct_IO = ceph_direct_io,
1406 };
1407
1408 static void ceph_block_sigs(sigset_t *oldset)
1409 {
1410 sigset_t mask;
1411 siginitsetinv(&mask, sigmask(SIGKILL));
1412 sigprocmask(SIG_BLOCK, &mask, oldset);
1413 }
1414
1415 static void ceph_restore_sigs(sigset_t *oldset)
1416 {
1417 sigprocmask(SIG_SETMASK, oldset, NULL);
1418 }
1419
1420 /*
1421 * vm ops
1422 */
1423 static int ceph_filemap_fault(struct vm_fault *vmf)
1424 {
1425 struct vm_area_struct *vma = vmf->vma;
1426 struct inode *inode = file_inode(vma->vm_file);
1427 struct ceph_inode_info *ci = ceph_inode(inode);
1428 struct ceph_file_info *fi = vma->vm_file->private_data;
1429 struct page *pinned_page = NULL;
1430 loff_t off = vmf->pgoff << PAGE_SHIFT;
1431 int want, got, ret;
1432 sigset_t oldset;
1433
1434 ceph_block_sigs(&oldset);
1435
1436 dout("filemap_fault %p %llx.%llx %llu~%zd trying to get caps\n",
1437 inode, ceph_vinop(inode), off, (size_t)PAGE_SIZE);
1438 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1439 want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
1440 else
1441 want = CEPH_CAP_FILE_CACHE;
1442
1443 got = 0;
1444 ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, -1, &got, &pinned_page);
1445 if (ret < 0)
1446 goto out_restore;
1447
1448 dout("filemap_fault %p %llu~%zd got cap refs on %s\n",
1449 inode, off, (size_t)PAGE_SIZE, ceph_cap_string(got));
1450
1451 if ((got & (CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO)) ||
1452 ci->i_inline_version == CEPH_INLINE_NONE) {
1453 current->journal_info = vma->vm_file;
1454 ret = filemap_fault(vmf);
1455 current->journal_info = NULL;
1456 } else
1457 ret = -EAGAIN;
1458
1459 dout("filemap_fault %p %llu~%zd dropping cap refs on %s ret %d\n",
1460 inode, off, (size_t)PAGE_SIZE, ceph_cap_string(got), ret);
1461 if (pinned_page)
1462 put_page(pinned_page);
1463 ceph_put_cap_refs(ci, got);
1464
1465 if (ret != -EAGAIN)
1466 goto out_restore;
1467
1468 /* read inline data */
1469 if (off >= PAGE_SIZE) {
1470 /* does not support inline data > PAGE_SIZE */
1471 ret = VM_FAULT_SIGBUS;
1472 } else {
1473 int ret1;
1474 struct address_space *mapping = inode->i_mapping;
1475 struct page *page = find_or_create_page(mapping, 0,
1476 mapping_gfp_constraint(mapping,
1477 ~__GFP_FS));
1478 if (!page) {
1479 ret = VM_FAULT_OOM;
1480 goto out_inline;
1481 }
1482 ret1 = __ceph_do_getattr(inode, page,
1483 CEPH_STAT_CAP_INLINE_DATA, true);
1484 if (ret1 < 0 || off >= i_size_read(inode)) {
1485 unlock_page(page);
1486 put_page(page);
1487 if (ret1 < 0)
1488 ret = ret1;
1489 else
1490 ret = VM_FAULT_SIGBUS;
1491 goto out_inline;
1492 }
1493 if (ret1 < PAGE_SIZE)
1494 zero_user_segment(page, ret1, PAGE_SIZE);
1495 else
1496 flush_dcache_page(page);
1497 SetPageUptodate(page);
1498 vmf->page = page;
1499 ret = VM_FAULT_MAJOR | VM_FAULT_LOCKED;
1500 out_inline:
1501 dout("filemap_fault %p %llu~%zd read inline data ret %d\n",
1502 inode, off, (size_t)PAGE_SIZE, ret);
1503 }
1504 out_restore:
1505 ceph_restore_sigs(&oldset);
1506 if (ret < 0)
1507 ret = (ret == -ENOMEM) ? VM_FAULT_OOM : VM_FAULT_SIGBUS;
1508
1509 return ret;
1510 }
1511
1512 /*
1513 * Reuse write_begin here for simplicity.
1514 */
1515 static int ceph_page_mkwrite(struct vm_fault *vmf)
1516 {
1517 struct vm_area_struct *vma = vmf->vma;
1518 struct inode *inode = file_inode(vma->vm_file);
1519 struct ceph_inode_info *ci = ceph_inode(inode);
1520 struct ceph_file_info *fi = vma->vm_file->private_data;
1521 struct ceph_cap_flush *prealloc_cf;
1522 struct page *page = vmf->page;
1523 loff_t off = page_offset(page);
1524 loff_t size = i_size_read(inode);
1525 size_t len;
1526 int want, got, ret;
1527 sigset_t oldset;
1528
1529 prealloc_cf = ceph_alloc_cap_flush();
1530 if (!prealloc_cf)
1531 return VM_FAULT_OOM;
1532
1533 ceph_block_sigs(&oldset);
1534
1535 if (ci->i_inline_version != CEPH_INLINE_NONE) {
1536 struct page *locked_page = NULL;
1537 if (off == 0) {
1538 lock_page(page);
1539 locked_page = page;
1540 }
1541 ret = ceph_uninline_data(vma->vm_file, locked_page);
1542 if (locked_page)
1543 unlock_page(locked_page);
1544 if (ret < 0)
1545 goto out_free;
1546 }
1547
1548 if (off + PAGE_SIZE <= size)
1549 len = PAGE_SIZE;
1550 else
1551 len = size & ~PAGE_MASK;
1552
1553 dout("page_mkwrite %p %llx.%llx %llu~%zd getting caps i_size %llu\n",
1554 inode, ceph_vinop(inode), off, len, size);
1555 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1556 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
1557 else
1558 want = CEPH_CAP_FILE_BUFFER;
1559
1560 got = 0;
1561 ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, off + len,
1562 &got, NULL);
1563 if (ret < 0)
1564 goto out_free;
1565
1566 dout("page_mkwrite %p %llu~%zd got cap refs on %s\n",
1567 inode, off, len, ceph_cap_string(got));
1568
1569 /* Update time before taking page lock */
1570 file_update_time(vma->vm_file);
1571
1572 do {
1573 lock_page(page);
1574
1575 if ((off > size) || (page->mapping != inode->i_mapping)) {
1576 unlock_page(page);
1577 ret = VM_FAULT_NOPAGE;
1578 break;
1579 }
1580
1581 ret = ceph_update_writeable_page(vma->vm_file, off, len, page);
1582 if (ret >= 0) {
1583 /* success. we'll keep the page locked. */
1584 set_page_dirty(page);
1585 ret = VM_FAULT_LOCKED;
1586 }
1587 } while (ret == -EAGAIN);
1588
1589 if (ret == VM_FAULT_LOCKED ||
1590 ci->i_inline_version != CEPH_INLINE_NONE) {
1591 int dirty;
1592 spin_lock(&ci->i_ceph_lock);
1593 ci->i_inline_version = CEPH_INLINE_NONE;
1594 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
1595 &prealloc_cf);
1596 spin_unlock(&ci->i_ceph_lock);
1597 if (dirty)
1598 __mark_inode_dirty(inode, dirty);
1599 }
1600
1601 dout("page_mkwrite %p %llu~%zd dropping cap refs on %s ret %d\n",
1602 inode, off, len, ceph_cap_string(got), ret);
1603 ceph_put_cap_refs(ci, got);
1604 out_free:
1605 ceph_restore_sigs(&oldset);
1606 ceph_free_cap_flush(prealloc_cf);
1607 if (ret < 0)
1608 ret = (ret == -ENOMEM) ? VM_FAULT_OOM : VM_FAULT_SIGBUS;
1609 return ret;
1610 }
1611
1612 void ceph_fill_inline_data(struct inode *inode, struct page *locked_page,
1613 char *data, size_t len)
1614 {
1615 struct address_space *mapping = inode->i_mapping;
1616 struct page *page;
1617
1618 if (locked_page) {
1619 page = locked_page;
1620 } else {
1621 if (i_size_read(inode) == 0)
1622 return;
1623 page = find_or_create_page(mapping, 0,
1624 mapping_gfp_constraint(mapping,
1625 ~__GFP_FS));
1626 if (!page)
1627 return;
1628 if (PageUptodate(page)) {
1629 unlock_page(page);
1630 put_page(page);
1631 return;
1632 }
1633 }
1634
1635 dout("fill_inline_data %p %llx.%llx len %zu locked_page %p\n",
1636 inode, ceph_vinop(inode), len, locked_page);
1637
1638 if (len > 0) {
1639 void *kaddr = kmap_atomic(page);
1640 memcpy(kaddr, data, len);
1641 kunmap_atomic(kaddr);
1642 }
1643
1644 if (page != locked_page) {
1645 if (len < PAGE_SIZE)
1646 zero_user_segment(page, len, PAGE_SIZE);
1647 else
1648 flush_dcache_page(page);
1649
1650 SetPageUptodate(page);
1651 unlock_page(page);
1652 put_page(page);
1653 }
1654 }
1655
1656 int ceph_uninline_data(struct file *filp, struct page *locked_page)
1657 {
1658 struct inode *inode = file_inode(filp);
1659 struct ceph_inode_info *ci = ceph_inode(inode);
1660 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1661 struct ceph_osd_request *req;
1662 struct page *page = NULL;
1663 u64 len, inline_version;
1664 int err = 0;
1665 bool from_pagecache = false;
1666
1667 spin_lock(&ci->i_ceph_lock);
1668 inline_version = ci->i_inline_version;
1669 spin_unlock(&ci->i_ceph_lock);
1670
1671 dout("uninline_data %p %llx.%llx inline_version %llu\n",
1672 inode, ceph_vinop(inode), inline_version);
1673
1674 if (inline_version == 1 || /* initial version, no data */
1675 inline_version == CEPH_INLINE_NONE)
1676 goto out;
1677
1678 if (locked_page) {
1679 page = locked_page;
1680 WARN_ON(!PageUptodate(page));
1681 } else if (ceph_caps_issued(ci) &
1682 (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) {
1683 page = find_get_page(inode->i_mapping, 0);
1684 if (page) {
1685 if (PageUptodate(page)) {
1686 from_pagecache = true;
1687 lock_page(page);
1688 } else {
1689 put_page(page);
1690 page = NULL;
1691 }
1692 }
1693 }
1694
1695 if (page) {
1696 len = i_size_read(inode);
1697 if (len > PAGE_SIZE)
1698 len = PAGE_SIZE;
1699 } else {
1700 page = __page_cache_alloc(GFP_NOFS);
1701 if (!page) {
1702 err = -ENOMEM;
1703 goto out;
1704 }
1705 err = __ceph_do_getattr(inode, page,
1706 CEPH_STAT_CAP_INLINE_DATA, true);
1707 if (err < 0) {
1708 /* no inline data */
1709 if (err == -ENODATA)
1710 err = 0;
1711 goto out;
1712 }
1713 len = err;
1714 }
1715
1716 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1717 ceph_vino(inode), 0, &len, 0, 1,
1718 CEPH_OSD_OP_CREATE, CEPH_OSD_FLAG_WRITE,
1719 NULL, 0, 0, false);
1720 if (IS_ERR(req)) {
1721 err = PTR_ERR(req);
1722 goto out;
1723 }
1724
1725 req->r_mtime = inode->i_mtime;
1726 err = ceph_osdc_start_request(&fsc->client->osdc, req, false);
1727 if (!err)
1728 err = ceph_osdc_wait_request(&fsc->client->osdc, req);
1729 ceph_osdc_put_request(req);
1730 if (err < 0)
1731 goto out;
1732
1733 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1734 ceph_vino(inode), 0, &len, 1, 3,
1735 CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE,
1736 NULL, ci->i_truncate_seq,
1737 ci->i_truncate_size, false);
1738 if (IS_ERR(req)) {
1739 err = PTR_ERR(req);
1740 goto out;
1741 }
1742
1743 osd_req_op_extent_osd_data_pages(req, 1, &page, len, 0, false, false);
1744
1745 {
1746 __le64 xattr_buf = cpu_to_le64(inline_version);
1747 err = osd_req_op_xattr_init(req, 0, CEPH_OSD_OP_CMPXATTR,
1748 "inline_version", &xattr_buf,
1749 sizeof(xattr_buf),
1750 CEPH_OSD_CMPXATTR_OP_GT,
1751 CEPH_OSD_CMPXATTR_MODE_U64);
1752 if (err)
1753 goto out_put;
1754 }
1755
1756 {
1757 char xattr_buf[32];
1758 int xattr_len = snprintf(xattr_buf, sizeof(xattr_buf),
1759 "%llu", inline_version);
1760 err = osd_req_op_xattr_init(req, 2, CEPH_OSD_OP_SETXATTR,
1761 "inline_version",
1762 xattr_buf, xattr_len, 0, 0);
1763 if (err)
1764 goto out_put;
1765 }
1766
1767 req->r_mtime = inode->i_mtime;
1768 err = ceph_osdc_start_request(&fsc->client->osdc, req, false);
1769 if (!err)
1770 err = ceph_osdc_wait_request(&fsc->client->osdc, req);
1771 out_put:
1772 ceph_osdc_put_request(req);
1773 if (err == -ECANCELED)
1774 err = 0;
1775 out:
1776 if (page && page != locked_page) {
1777 if (from_pagecache) {
1778 unlock_page(page);
1779 put_page(page);
1780 } else
1781 __free_pages(page, 0);
1782 }
1783
1784 dout("uninline_data %p %llx.%llx inline_version %llu = %d\n",
1785 inode, ceph_vinop(inode), inline_version, err);
1786 return err;
1787 }
1788
1789 static const struct vm_operations_struct ceph_vmops = {
1790 .fault = ceph_filemap_fault,
1791 .page_mkwrite = ceph_page_mkwrite,
1792 };
1793
1794 int ceph_mmap(struct file *file, struct vm_area_struct *vma)
1795 {
1796 struct address_space *mapping = file->f_mapping;
1797
1798 if (!mapping->a_ops->readpage)
1799 return -ENOEXEC;
1800 file_accessed(file);
1801 vma->vm_ops = &ceph_vmops;
1802 return 0;
1803 }
1804
1805 enum {
1806 POOL_READ = 1,
1807 POOL_WRITE = 2,
1808 };
1809
1810 static int __ceph_pool_perm_get(struct ceph_inode_info *ci,
1811 s64 pool, struct ceph_string *pool_ns)
1812 {
1813 struct ceph_fs_client *fsc = ceph_inode_to_client(&ci->vfs_inode);
1814 struct ceph_mds_client *mdsc = fsc->mdsc;
1815 struct ceph_osd_request *rd_req = NULL, *wr_req = NULL;
1816 struct rb_node **p, *parent;
1817 struct ceph_pool_perm *perm;
1818 struct page **pages;
1819 size_t pool_ns_len;
1820 int err = 0, err2 = 0, have = 0;
1821
1822 down_read(&mdsc->pool_perm_rwsem);
1823 p = &mdsc->pool_perm_tree.rb_node;
1824 while (*p) {
1825 perm = rb_entry(*p, struct ceph_pool_perm, node);
1826 if (pool < perm->pool)
1827 p = &(*p)->rb_left;
1828 else if (pool > perm->pool)
1829 p = &(*p)->rb_right;
1830 else {
1831 int ret = ceph_compare_string(pool_ns,
1832 perm->pool_ns,
1833 perm->pool_ns_len);
1834 if (ret < 0)
1835 p = &(*p)->rb_left;
1836 else if (ret > 0)
1837 p = &(*p)->rb_right;
1838 else {
1839 have = perm->perm;
1840 break;
1841 }
1842 }
1843 }
1844 up_read(&mdsc->pool_perm_rwsem);
1845 if (*p)
1846 goto out;
1847
1848 if (pool_ns)
1849 dout("__ceph_pool_perm_get pool %lld ns %.*s no perm cached\n",
1850 pool, (int)pool_ns->len, pool_ns->str);
1851 else
1852 dout("__ceph_pool_perm_get pool %lld no perm cached\n", pool);
1853
1854 down_write(&mdsc->pool_perm_rwsem);
1855 p = &mdsc->pool_perm_tree.rb_node;
1856 parent = NULL;
1857 while (*p) {
1858 parent = *p;
1859 perm = rb_entry(parent, struct ceph_pool_perm, node);
1860 if (pool < perm->pool)
1861 p = &(*p)->rb_left;
1862 else if (pool > perm->pool)
1863 p = &(*p)->rb_right;
1864 else {
1865 int ret = ceph_compare_string(pool_ns,
1866 perm->pool_ns,
1867 perm->pool_ns_len);
1868 if (ret < 0)
1869 p = &(*p)->rb_left;
1870 else if (ret > 0)
1871 p = &(*p)->rb_right;
1872 else {
1873 have = perm->perm;
1874 break;
1875 }
1876 }
1877 }
1878 if (*p) {
1879 up_write(&mdsc->pool_perm_rwsem);
1880 goto out;
1881 }
1882
1883 rd_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL,
1884 1, false, GFP_NOFS);
1885 if (!rd_req) {
1886 err = -ENOMEM;
1887 goto out_unlock;
1888 }
1889
1890 rd_req->r_flags = CEPH_OSD_FLAG_READ;
1891 osd_req_op_init(rd_req, 0, CEPH_OSD_OP_STAT, 0);
1892 rd_req->r_base_oloc.pool = pool;
1893 if (pool_ns)
1894 rd_req->r_base_oloc.pool_ns = ceph_get_string(pool_ns);
1895 ceph_oid_printf(&rd_req->r_base_oid, "%llx.00000000", ci->i_vino.ino);
1896
1897 err = ceph_osdc_alloc_messages(rd_req, GFP_NOFS);
1898 if (err)
1899 goto out_unlock;
1900
1901 wr_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL,
1902 1, false, GFP_NOFS);
1903 if (!wr_req) {
1904 err = -ENOMEM;
1905 goto out_unlock;
1906 }
1907
1908 wr_req->r_flags = CEPH_OSD_FLAG_WRITE;
1909 osd_req_op_init(wr_req, 0, CEPH_OSD_OP_CREATE, CEPH_OSD_OP_FLAG_EXCL);
1910 ceph_oloc_copy(&wr_req->r_base_oloc, &rd_req->r_base_oloc);
1911 ceph_oid_copy(&wr_req->r_base_oid, &rd_req->r_base_oid);
1912
1913 err = ceph_osdc_alloc_messages(wr_req, GFP_NOFS);
1914 if (err)
1915 goto out_unlock;
1916
1917 /* one page should be large enough for STAT data */
1918 pages = ceph_alloc_page_vector(1, GFP_KERNEL);
1919 if (IS_ERR(pages)) {
1920 err = PTR_ERR(pages);
1921 goto out_unlock;
1922 }
1923
1924 osd_req_op_raw_data_in_pages(rd_req, 0, pages, PAGE_SIZE,
1925 0, false, true);
1926 err = ceph_osdc_start_request(&fsc->client->osdc, rd_req, false);
1927
1928 wr_req->r_mtime = ci->vfs_inode.i_mtime;
1929 wr_req->r_abort_on_full = true;
1930 err2 = ceph_osdc_start_request(&fsc->client->osdc, wr_req, false);
1931
1932 if (!err)
1933 err = ceph_osdc_wait_request(&fsc->client->osdc, rd_req);
1934 if (!err2)
1935 err2 = ceph_osdc_wait_request(&fsc->client->osdc, wr_req);
1936
1937 if (err >= 0 || err == -ENOENT)
1938 have |= POOL_READ;
1939 else if (err != -EPERM)
1940 goto out_unlock;
1941
1942 if (err2 == 0 || err2 == -EEXIST)
1943 have |= POOL_WRITE;
1944 else if (err2 != -EPERM) {
1945 err = err2;
1946 goto out_unlock;
1947 }
1948
1949 pool_ns_len = pool_ns ? pool_ns->len : 0;
1950 perm = kmalloc(sizeof(*perm) + pool_ns_len + 1, GFP_NOFS);
1951 if (!perm) {
1952 err = -ENOMEM;
1953 goto out_unlock;
1954 }
1955
1956 perm->pool = pool;
1957 perm->perm = have;
1958 perm->pool_ns_len = pool_ns_len;
1959 if (pool_ns_len > 0)
1960 memcpy(perm->pool_ns, pool_ns->str, pool_ns_len);
1961 perm->pool_ns[pool_ns_len] = 0;
1962
1963 rb_link_node(&perm->node, parent, p);
1964 rb_insert_color(&perm->node, &mdsc->pool_perm_tree);
1965 err = 0;
1966 out_unlock:
1967 up_write(&mdsc->pool_perm_rwsem);
1968
1969 ceph_osdc_put_request(rd_req);
1970 ceph_osdc_put_request(wr_req);
1971 out:
1972 if (!err)
1973 err = have;
1974 if (pool_ns)
1975 dout("__ceph_pool_perm_get pool %lld ns %.*s result = %d\n",
1976 pool, (int)pool_ns->len, pool_ns->str, err);
1977 else
1978 dout("__ceph_pool_perm_get pool %lld result = %d\n", pool, err);
1979 return err;
1980 }
1981
1982 int ceph_pool_perm_check(struct ceph_inode_info *ci, int need)
1983 {
1984 s64 pool;
1985 struct ceph_string *pool_ns;
1986 int ret, flags;
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(&ci->vfs_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);
2005 check:
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
2044 void 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 }
Linux with added FPC-III support