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Merge tag 'xtensa-20180225' of git://github.com/jcmvbkbc/linux-xtensa
[cris-mirror.git] / fs / ceph / addr.c
blobb4336b42ce3bb1fabec247c01f51d86c2c28490f
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 ceph_rw_context *rw_ctx,
303 struct list_head *page_list, int max)
304 {
305 struct ceph_osd_client *osdc =
306 &ceph_inode_to_client(inode)->client->osdc;
307 struct ceph_inode_info *ci = ceph_inode(inode);
308 struct page *page = list_entry(page_list->prev, struct page, lru);
309 struct ceph_vino vino;
310 struct ceph_osd_request *req;
311 u64 off;
312 u64 len;
313 int i;
314 struct page **pages;
315 pgoff_t next_index;
316 int nr_pages = 0;
317 int got = 0;
318 int ret = 0;
319
320 if (!rw_ctx) {
321 /* caller of readpages does not hold buffer and read caps
322 * (fadvise, madvise and readahead cases) */
323 int want = CEPH_CAP_FILE_CACHE;
324 ret = ceph_try_get_caps(ci, CEPH_CAP_FILE_RD, want, &got);
325 if (ret < 0) {
326 dout("start_read %p, error getting cap\n", inode);
327 } else if (!(got & want)) {
328 dout("start_read %p, no cache cap\n", inode);
329 ret = 0;
330 }
331 if (ret <= 0) {
332 if (got)
333 ceph_put_cap_refs(ci, got);
334 while (!list_empty(page_list)) {
335 page = list_entry(page_list->prev,
336 struct page, lru);
337 list_del(&page->lru);
338 put_page(page);
339 }
340 return ret;
341 }
342 }
343
344 off = (u64) page_offset(page);
345
346 /* count pages */
347 next_index = page->index;
348 list_for_each_entry_reverse(page, page_list, lru) {
349 if (page->index != next_index)
350 break;
351 nr_pages++;
352 next_index++;
353 if (max && nr_pages == max)
354 break;
355 }
356 len = nr_pages << PAGE_SHIFT;
357 dout("start_read %p nr_pages %d is %lld~%lld\n", inode, nr_pages,
358 off, len);
359 vino = ceph_vino(inode);
360 req = ceph_osdc_new_request(osdc, &ci->i_layout, vino, off, &len,
361 0, 1, CEPH_OSD_OP_READ,
362 CEPH_OSD_FLAG_READ, NULL,
363 ci->i_truncate_seq, ci->i_truncate_size,
364 false);
365 if (IS_ERR(req)) {
366 ret = PTR_ERR(req);
367 goto out;
368 }
369
370 /* build page vector */
371 nr_pages = calc_pages_for(0, len);
372 pages = kmalloc(sizeof(*pages) * nr_pages, GFP_KERNEL);
373 if (!pages) {
374 ret = -ENOMEM;
375 goto out_put;
376 }
377 for (i = 0; i < nr_pages; ++i) {
378 page = list_entry(page_list->prev, struct page, lru);
379 BUG_ON(PageLocked(page));
380 list_del(&page->lru);
381
382 dout("start_read %p adding %p idx %lu\n", inode, page,
383 page->index);
384 if (add_to_page_cache_lru(page, &inode->i_data, page->index,
385 GFP_KERNEL)) {
386 ceph_fscache_uncache_page(inode, page);
387 put_page(page);
388 dout("start_read %p add_to_page_cache failed %p\n",
389 inode, page);
390 nr_pages = i;
391 if (nr_pages > 0) {
392 len = nr_pages << PAGE_SHIFT;
393 osd_req_op_extent_update(req, 0, len);
394 break;
395 }
396 goto out_pages;
397 }
398 pages[i] = page;
399 }
400 osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0, false, false);
401 req->r_callback = finish_read;
402 req->r_inode = inode;
403
404 dout("start_read %p starting %p %lld~%lld\n", inode, req, off, len);
405 ret = ceph_osdc_start_request(osdc, req, false);
406 if (ret < 0)
407 goto out_pages;
408 ceph_osdc_put_request(req);
409
410 /* After adding locked pages to page cache, the inode holds cache cap.
411 * So we can drop our cap refs. */
412 if (got)
413 ceph_put_cap_refs(ci, got);
414
415 return nr_pages;
416
417 out_pages:
418 for (i = 0; i < nr_pages; ++i) {
419 ceph_fscache_readpage_cancel(inode, pages[i]);
420 unlock_page(pages[i]);
421 }
422 ceph_put_page_vector(pages, nr_pages, false);
423 out_put:
424 ceph_osdc_put_request(req);
425 out:
426 if (got)
427 ceph_put_cap_refs(ci, got);
428 return ret;
429 }
430
431
432 /*
433 * Read multiple pages. Leave pages we don't read + unlock in page_list;
434 * the caller (VM) cleans them up.
435 */
436 static int ceph_readpages(struct file *file, struct address_space *mapping,
437 struct list_head *page_list, unsigned nr_pages)
438 {
439 struct inode *inode = file_inode(file);
440 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
441 struct ceph_file_info *ci = file->private_data;
442 struct ceph_rw_context *rw_ctx;
443 int rc = 0;
444 int max = 0;
445
446 if (ceph_inode(inode)->i_inline_version != CEPH_INLINE_NONE)
447 return -EINVAL;
448
449 rc = ceph_readpages_from_fscache(mapping->host, mapping, page_list,
450 &nr_pages);
451
452 if (rc == 0)
453 goto out;
454
455 rw_ctx = ceph_find_rw_context(ci);
456 max = fsc->mount_options->rsize >> PAGE_SHIFT;
457 dout("readpages %p file %p ctx %p nr_pages %d max %d\n",
458 inode, file, rw_ctx, nr_pages, max);
459 while (!list_empty(page_list)) {
460 rc = start_read(inode, rw_ctx, page_list, max);
461 if (rc < 0)
462 goto out;
463 }
464 out:
465 ceph_fscache_readpages_cancel(inode, page_list);
466
467 dout("readpages %p file %p ret %d\n", inode, file, rc);
468 return rc;
469 }
470
471 struct ceph_writeback_ctl
472 {
473 loff_t i_size;
474 u64 truncate_size;
475 u32 truncate_seq;
476 bool size_stable;
477 bool head_snapc;
478 };
479
480 /*
481 * Get ref for the oldest snapc for an inode with dirty data... that is, the
482 * only snap context we are allowed to write back.
483 */
484 static struct ceph_snap_context *
485 get_oldest_context(struct inode *inode, struct ceph_writeback_ctl *ctl,
486 struct ceph_snap_context *page_snapc)
487 {
488 struct ceph_inode_info *ci = ceph_inode(inode);
489 struct ceph_snap_context *snapc = NULL;
490 struct ceph_cap_snap *capsnap = NULL;
491
492 spin_lock(&ci->i_ceph_lock);
493 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
494 dout(" cap_snap %p snapc %p has %d dirty pages\n", capsnap,
495 capsnap->context, capsnap->dirty_pages);
496 if (!capsnap->dirty_pages)
497 continue;
498
499 /* get i_size, truncate_{seq,size} for page_snapc? */
500 if (snapc && capsnap->context != page_snapc)
501 continue;
502
503 if (ctl) {
504 if (capsnap->writing) {
505 ctl->i_size = i_size_read(inode);
506 ctl->size_stable = false;
507 } else {
508 ctl->i_size = capsnap->size;
509 ctl->size_stable = true;
510 }
511 ctl->truncate_size = capsnap->truncate_size;
512 ctl->truncate_seq = capsnap->truncate_seq;
513 ctl->head_snapc = false;
514 }
515
516 if (snapc)
517 break;
518
519 snapc = ceph_get_snap_context(capsnap->context);
520 if (!page_snapc ||
521 page_snapc == snapc ||
522 page_snapc->seq > snapc->seq)
523 break;
524 }
525 if (!snapc && ci->i_wrbuffer_ref_head) {
526 snapc = ceph_get_snap_context(ci->i_head_snapc);
527 dout(" head snapc %p has %d dirty pages\n",
528 snapc, ci->i_wrbuffer_ref_head);
529 if (ctl) {
530 ctl->i_size = i_size_read(inode);
531 ctl->truncate_size = ci->i_truncate_size;
532 ctl->truncate_seq = ci->i_truncate_seq;
533 ctl->size_stable = false;
534 ctl->head_snapc = true;
535 }
536 }
537 spin_unlock(&ci->i_ceph_lock);
538 return snapc;
539 }
540
541 static u64 get_writepages_data_length(struct inode *inode,
542 struct page *page, u64 start)
543 {
544 struct ceph_inode_info *ci = ceph_inode(inode);
545 struct ceph_snap_context *snapc = page_snap_context(page);
546 struct ceph_cap_snap *capsnap = NULL;
547 u64 end = i_size_read(inode);
548
549 if (snapc != ci->i_head_snapc) {
550 bool found = false;
551 spin_lock(&ci->i_ceph_lock);
552 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
553 if (capsnap->context == snapc) {
554 if (!capsnap->writing)
555 end = capsnap->size;
556 found = true;
557 break;
558 }
559 }
560 spin_unlock(&ci->i_ceph_lock);
561 WARN_ON(!found);
562 }
563 if (end > page_offset(page) + PAGE_SIZE)
564 end = page_offset(page) + PAGE_SIZE;
565 return end > start ? end - start : 0;
566 }
567
568 /*
569 * Write a single page, but leave the page locked.
570 *
571 * If we get a write error, set the page error bit, but still adjust the
572 * dirty page accounting (i.e., page is no longer dirty).
573 */
574 static int writepage_nounlock(struct page *page, struct writeback_control *wbc)
575 {
576 struct inode *inode;
577 struct ceph_inode_info *ci;
578 struct ceph_fs_client *fsc;
579 struct ceph_snap_context *snapc, *oldest;
580 loff_t page_off = page_offset(page);
581 int err, len = PAGE_SIZE;
582 struct ceph_writeback_ctl ceph_wbc;
583
584 dout("writepage %p idx %lu\n", page, page->index);
585
586 inode = page->mapping->host;
587 ci = ceph_inode(inode);
588 fsc = ceph_inode_to_client(inode);
589
590 /* verify this is a writeable snap context */
591 snapc = page_snap_context(page);
592 if (!snapc) {
593 dout("writepage %p page %p not dirty?\n", inode, page);
594 return 0;
595 }
596 oldest = get_oldest_context(inode, &ceph_wbc, snapc);
597 if (snapc->seq > oldest->seq) {
598 dout("writepage %p page %p snapc %p not writeable - noop\n",
599 inode, page, snapc);
600 /* we should only noop if called by kswapd */
601 WARN_ON(!(current->flags & PF_MEMALLOC));
602 ceph_put_snap_context(oldest);
603 redirty_page_for_writepage(wbc, page);
604 return 0;
605 }
606 ceph_put_snap_context(oldest);
607
608 /* is this a partial page at end of file? */
609 if (page_off >= ceph_wbc.i_size) {
610 dout("%p page eof %llu\n", page, ceph_wbc.i_size);
611 page->mapping->a_ops->invalidatepage(page, 0, PAGE_SIZE);
612 return 0;
613 }
614
615 if (ceph_wbc.i_size < page_off + len)
616 len = ceph_wbc.i_size - page_off;
617
618 dout("writepage %p page %p index %lu on %llu~%u snapc %p seq %lld\n",
619 inode, page, page->index, page_off, len, snapc, snapc->seq);
620
621 if (atomic_long_inc_return(&fsc->writeback_count) >
622 CONGESTION_ON_THRESH(fsc->mount_options->congestion_kb))
623 set_bdi_congested(inode_to_bdi(inode), BLK_RW_ASYNC);
624
625 set_page_writeback(page);
626 err = ceph_osdc_writepages(&fsc->client->osdc, ceph_vino(inode),
627 &ci->i_layout, snapc, page_off, len,
628 ceph_wbc.truncate_seq,
629 ceph_wbc.truncate_size,
630 &inode->i_mtime, &page, 1);
631 if (err < 0) {
632 struct writeback_control tmp_wbc;
633 if (!wbc)
634 wbc = &tmp_wbc;
635 if (err == -ERESTARTSYS) {
636 /* killed by SIGKILL */
637 dout("writepage interrupted page %p\n", page);
638 redirty_page_for_writepage(wbc, page);
639 end_page_writeback(page);
640 return err;
641 }
642 dout("writepage setting page/mapping error %d %p\n",
643 err, page);
644 SetPageError(page);
645 mapping_set_error(&inode->i_data, err);
646 wbc->pages_skipped++;
647 } else {
648 dout("writepage cleaned page %p\n", page);
649 err = 0; /* vfs expects us to return 0 */
650 }
651 page->private = 0;
652 ClearPagePrivate(page);
653 end_page_writeback(page);
654 ceph_put_wrbuffer_cap_refs(ci, 1, snapc);
655 ceph_put_snap_context(snapc); /* page's reference */
656
657 if (atomic_long_dec_return(&fsc->writeback_count) <
658 CONGESTION_OFF_THRESH(fsc->mount_options->congestion_kb))
659 clear_bdi_congested(inode_to_bdi(inode), BLK_RW_ASYNC);
660
661 return err;
662 }
663
664 static int ceph_writepage(struct page *page, struct writeback_control *wbc)
665 {
666 int err;
667 struct inode *inode = page->mapping->host;
668 BUG_ON(!inode);
669 ihold(inode);
670 err = writepage_nounlock(page, wbc);
671 if (err == -ERESTARTSYS) {
672 /* direct memory reclaimer was killed by SIGKILL. return 0
673 * to prevent caller from setting mapping/page error */
674 err = 0;
675 }
676 unlock_page(page);
677 iput(inode);
678 return err;
679 }
680
681 /*
682 * lame release_pages helper. release_pages() isn't exported to
683 * modules.
684 */
685 static void ceph_release_pages(struct page **pages, int num)
686 {
687 struct pagevec pvec;
688 int i;
689
690 pagevec_init(&pvec);
691 for (i = 0; i < num; i++) {
692 if (pagevec_add(&pvec, pages[i]) == 0)
693 pagevec_release(&pvec);
694 }
695 pagevec_release(&pvec);
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 */
704 static 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 bool remove_page;
717
718 dout("writepages_finish %p rc %d\n", inode, rc);
719 if (rc < 0) {
720 mapping_set_error(mapping, rc);
721 ceph_set_error_write(ci);
722 } else {
723 ceph_clear_error_write(ci);
724 }
725
726 /*
727 * We lost the cache cap, need to truncate the page before
728 * it is unlocked, otherwise we'd truncate it later in the
729 * page truncation thread, possibly losing some data that
730 * raced its way in
731 */
732 remove_page = !(ceph_caps_issued(ci) &
733 (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO));
734
735 /* clean all pages */
736 for (i = 0; i < req->r_num_ops; i++) {
737 if (req->r_ops[i].op != CEPH_OSD_OP_WRITE)
738 break;
739
740 osd_data = osd_req_op_extent_osd_data(req, i);
741 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES);
742 num_pages = calc_pages_for((u64)osd_data->alignment,
743 (u64)osd_data->length);
744 total_pages += num_pages;
745 for (j = 0; j < num_pages; j++) {
746 page = osd_data->pages[j];
747 BUG_ON(!page);
748 WARN_ON(!PageUptodate(page));
749
750 if (atomic_long_dec_return(&fsc->writeback_count) <
751 CONGESTION_OFF_THRESH(
752 fsc->mount_options->congestion_kb))
753 clear_bdi_congested(inode_to_bdi(inode),
754 BLK_RW_ASYNC);
755
756 ceph_put_snap_context(page_snap_context(page));
757 page->private = 0;
758 ClearPagePrivate(page);
759 dout("unlocking %p\n", page);
760 end_page_writeback(page);
761
762 if (remove_page)
763 generic_error_remove_page(inode->i_mapping,
764 page);
765
766 unlock_page(page);
767 }
768 dout("writepages_finish %p wrote %llu bytes cleaned %d pages\n",
769 inode, osd_data->length, rc >= 0 ? num_pages : 0);
770
771 ceph_release_pages(osd_data->pages, num_pages);
772 }
773
774 ceph_put_wrbuffer_cap_refs(ci, total_pages, snapc);
775
776 osd_data = osd_req_op_extent_osd_data(req, 0);
777 if (osd_data->pages_from_pool)
778 mempool_free(osd_data->pages,
779 ceph_sb_to_client(inode->i_sb)->wb_pagevec_pool);
780 else
781 kfree(osd_data->pages);
782 ceph_osdc_put_request(req);
783 }
784
785 /*
786 * initiate async writeback
787 */
788 static int ceph_writepages_start(struct address_space *mapping,
789 struct writeback_control *wbc)
790 {
791 struct inode *inode = mapping->host;
792 struct ceph_inode_info *ci = ceph_inode(inode);
793 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
794 struct ceph_vino vino = ceph_vino(inode);
795 pgoff_t index, start_index, end = -1;
796 struct ceph_snap_context *snapc = NULL, *last_snapc = NULL, *pgsnapc;
797 struct pagevec pvec;
798 int rc = 0;
799 unsigned int wsize = i_blocksize(inode);
800 struct ceph_osd_request *req = NULL;
801 struct ceph_writeback_ctl ceph_wbc;
802 bool should_loop, range_whole = false;
803 bool stop, done = false;
804
805 dout("writepages_start %p (mode=%s)\n", inode,
806 wbc->sync_mode == WB_SYNC_NONE ? "NONE" :
807 (wbc->sync_mode == WB_SYNC_ALL ? "ALL" : "HOLD"));
808
809 if (READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
810 if (ci->i_wrbuffer_ref > 0) {
811 pr_warn_ratelimited(
812 "writepage_start %p %lld forced umount\n",
813 inode, ceph_ino(inode));
814 }
815 mapping_set_error(mapping, -EIO);
816 return -EIO; /* we're in a forced umount, don't write! */
817 }
818 if (fsc->mount_options->wsize < wsize)
819 wsize = fsc->mount_options->wsize;
820
821 pagevec_init(&pvec);
822
823 start_index = wbc->range_cyclic ? mapping->writeback_index : 0;
824 index = start_index;
825
826 retry:
827 /* find oldest snap context with dirty data */
828 snapc = get_oldest_context(inode, &ceph_wbc, NULL);
829 if (!snapc) {
830 /* hmm, why does writepages get called when there
831 is no dirty data? */
832 dout(" no snap context with dirty data?\n");
833 goto out;
834 }
835 dout(" oldest snapc is %p seq %lld (%d snaps)\n",
836 snapc, snapc->seq, snapc->num_snaps);
837
838 should_loop = false;
839 if (ceph_wbc.head_snapc && snapc != last_snapc) {
840 /* where to start/end? */
841 if (wbc->range_cyclic) {
842 index = start_index;
843 end = -1;
844 if (index > 0)
845 should_loop = true;
846 dout(" cyclic, start at %lu\n", index);
847 } else {
848 index = wbc->range_start >> PAGE_SHIFT;
849 end = wbc->range_end >> PAGE_SHIFT;
850 if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
851 range_whole = true;
852 dout(" not cyclic, %lu to %lu\n", index, end);
853 }
854 } else if (!ceph_wbc.head_snapc) {
855 /* Do not respect wbc->range_{start,end}. Dirty pages
856 * in that range can be associated with newer snapc.
857 * They are not writeable until we write all dirty pages
858 * associated with 'snapc' get written */
859 if (index > 0 || wbc->sync_mode != WB_SYNC_NONE)
860 should_loop = true;
861 dout(" non-head snapc, range whole\n");
862 }
863
864 ceph_put_snap_context(last_snapc);
865 last_snapc = snapc;
866
867 stop = false;
868 while (!stop && index <= end) {
869 int num_ops = 0, op_idx;
870 unsigned i, pvec_pages, max_pages, locked_pages = 0;
871 struct page **pages = NULL, **data_pages;
872 mempool_t *pool = NULL; /* Becomes non-null if mempool used */
873 struct page *page;
874 pgoff_t strip_unit_end = 0;
875 u64 offset = 0, len = 0;
876
877 max_pages = wsize >> PAGE_SHIFT;
878
879 get_more_pages:
880 pvec_pages = pagevec_lookup_range_nr_tag(&pvec, mapping, &index,
881 end, PAGECACHE_TAG_DIRTY,
882 max_pages - locked_pages);
883 dout("pagevec_lookup_range_tag got %d\n", pvec_pages);
884 if (!pvec_pages && !locked_pages)
885 break;
886 for (i = 0; i < pvec_pages && locked_pages < max_pages; i++) {
887 page = pvec.pages[i];
888 dout("? %p idx %lu\n", page, page->index);
889 if (locked_pages == 0)
890 lock_page(page); /* first page */
891 else if (!trylock_page(page))
892 break;
893
894 /* only dirty pages, or our accounting breaks */
895 if (unlikely(!PageDirty(page)) ||
896 unlikely(page->mapping != mapping)) {
897 dout("!dirty or !mapping %p\n", page);
898 unlock_page(page);
899 continue;
900 }
901 if (strip_unit_end && (page->index > strip_unit_end)) {
902 dout("end of strip unit %p\n", page);
903 unlock_page(page);
904 break;
905 }
906 if (page_offset(page) >= ceph_wbc.i_size) {
907 dout("%p page eof %llu\n",
908 page, ceph_wbc.i_size);
909 /* not done if range_cyclic */
910 stop = true;
911 unlock_page(page);
912 break;
913 }
914 if (PageWriteback(page)) {
915 if (wbc->sync_mode == WB_SYNC_NONE) {
916 dout("%p under writeback\n", page);
917 unlock_page(page);
918 continue;
919 }
920 dout("waiting on writeback %p\n", page);
921 wait_on_page_writeback(page);
922 }
923
924 /* only if matching snap context */
925 pgsnapc = page_snap_context(page);
926 if (pgsnapc != snapc) {
927 dout("page snapc %p %lld != oldest %p %lld\n",
928 pgsnapc, pgsnapc->seq, snapc, snapc->seq);
929 unlock_page(page);
930 continue;
931 }
932
933 if (!clear_page_dirty_for_io(page)) {
934 dout("%p !clear_page_dirty_for_io\n", page);
935 unlock_page(page);
936 continue;
937 }
938
939 /*
940 * We have something to write. If this is
941 * the first locked page this time through,
942 * calculate max possinle write size and
943 * allocate a page array
944 */
945 if (locked_pages == 0) {
946 u64 objnum;
947 u64 objoff;
948
949 /* prepare async write request */
950 offset = (u64)page_offset(page);
951 len = wsize;
952
953 rc = ceph_calc_file_object_mapping(&ci->i_layout,
954 offset, len,
955 &objnum, &objoff,
956 &len);
957 if (rc < 0) {
958 unlock_page(page);
959 break;
960 }
961
962 num_ops = 1;
963 strip_unit_end = page->index +
964 ((len - 1) >> PAGE_SHIFT);
965
966 BUG_ON(pages);
967 max_pages = calc_pages_for(0, (u64)len);
968 pages = kmalloc(max_pages * sizeof (*pages),
969 GFP_NOFS);
970 if (!pages) {
971 pool = fsc->wb_pagevec_pool;
972 pages = mempool_alloc(pool, GFP_NOFS);
973 BUG_ON(!pages);
974 }
975
976 len = 0;
977 } else if (page->index !=
978 (offset + len) >> PAGE_SHIFT) {
979 if (num_ops >= (pool ? CEPH_OSD_SLAB_OPS :
980 CEPH_OSD_MAX_OPS)) {
981 redirty_page_for_writepage(wbc, page);
982 unlock_page(page);
983 break;
984 }
985
986 num_ops++;
987 offset = (u64)page_offset(page);
988 len = 0;
989 }
990
991 /* note position of first page in pvec */
992 dout("%p will write page %p idx %lu\n",
993 inode, page, page->index);
994
995 if (atomic_long_inc_return(&fsc->writeback_count) >
996 CONGESTION_ON_THRESH(
997 fsc->mount_options->congestion_kb)) {
998 set_bdi_congested(inode_to_bdi(inode),
999 BLK_RW_ASYNC);
1000 }
1001
1002
1003 pages[locked_pages++] = page;
1004 pvec.pages[i] = NULL;
1005
1006 len += PAGE_SIZE;
1007 }
1008
1009 /* did we get anything? */
1010 if (!locked_pages)
1011 goto release_pvec_pages;
1012 if (i) {
1013 unsigned j, n = 0;
1014 /* shift unused page to beginning of pvec */
1015 for (j = 0; j < pvec_pages; j++) {
1016 if (!pvec.pages[j])
1017 continue;
1018 if (n < j)
1019 pvec.pages[n] = pvec.pages[j];
1020 n++;
1021 }
1022 pvec.nr = n;
1023
1024 if (pvec_pages && i == pvec_pages &&
1025 locked_pages < max_pages) {
1026 dout("reached end pvec, trying for more\n");
1027 pagevec_release(&pvec);
1028 goto get_more_pages;
1029 }
1030 }
1031
1032 new_request:
1033 offset = page_offset(pages[0]);
1034 len = wsize;
1035
1036 req = ceph_osdc_new_request(&fsc->client->osdc,
1037 &ci->i_layout, vino,
1038 offset, &len, 0, num_ops,
1039 CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE,
1040 snapc, ceph_wbc.truncate_seq,
1041 ceph_wbc.truncate_size, false);
1042 if (IS_ERR(req)) {
1043 req = ceph_osdc_new_request(&fsc->client->osdc,
1044 &ci->i_layout, vino,
1045 offset, &len, 0,
1046 min(num_ops,
1047 CEPH_OSD_SLAB_OPS),
1048 CEPH_OSD_OP_WRITE,
1049 CEPH_OSD_FLAG_WRITE,
1050 snapc, ceph_wbc.truncate_seq,
1051 ceph_wbc.truncate_size, true);
1052 BUG_ON(IS_ERR(req));
1053 }
1054 BUG_ON(len < page_offset(pages[locked_pages - 1]) +
1055 PAGE_SIZE - offset);
1056
1057 req->r_callback = writepages_finish;
1058 req->r_inode = inode;
1059
1060 /* Format the osd request message and submit the write */
1061 len = 0;
1062 data_pages = pages;
1063 op_idx = 0;
1064 for (i = 0; i < locked_pages; i++) {
1065 u64 cur_offset = page_offset(pages[i]);
1066 if (offset + len != cur_offset) {
1067 if (op_idx + 1 == req->r_num_ops)
1068 break;
1069 osd_req_op_extent_dup_last(req, op_idx,
1070 cur_offset - offset);
1071 dout("writepages got pages at %llu~%llu\n",
1072 offset, len);
1073 osd_req_op_extent_osd_data_pages(req, op_idx,
1074 data_pages, len, 0,
1075 !!pool, false);
1076 osd_req_op_extent_update(req, op_idx, len);
1077
1078 len = 0;
1079 offset = cur_offset;
1080 data_pages = pages + i;
1081 op_idx++;
1082 }
1083
1084 set_page_writeback(pages[i]);
1085 len += PAGE_SIZE;
1086 }
1087
1088 if (ceph_wbc.size_stable) {
1089 len = min(len, ceph_wbc.i_size - offset);
1090 } else if (i == locked_pages) {
1091 /* writepages_finish() clears writeback pages
1092 * according to the data length, so make sure
1093 * data length covers all locked pages */
1094 u64 min_len = len + 1 - PAGE_SIZE;
1095 len = get_writepages_data_length(inode, pages[i - 1],
1096 offset);
1097 len = max(len, min_len);
1098 }
1099 dout("writepages got pages at %llu~%llu\n", offset, len);
1100
1101 osd_req_op_extent_osd_data_pages(req, op_idx, data_pages, len,
1102 0, !!pool, false);
1103 osd_req_op_extent_update(req, op_idx, len);
1104
1105 BUG_ON(op_idx + 1 != req->r_num_ops);
1106
1107 pool = NULL;
1108 if (i < locked_pages) {
1109 BUG_ON(num_ops <= req->r_num_ops);
1110 num_ops -= req->r_num_ops;
1111 locked_pages -= i;
1112
1113 /* allocate new pages array for next request */
1114 data_pages = pages;
1115 pages = kmalloc(locked_pages * sizeof (*pages),
1116 GFP_NOFS);
1117 if (!pages) {
1118 pool = fsc->wb_pagevec_pool;
1119 pages = mempool_alloc(pool, GFP_NOFS);
1120 BUG_ON(!pages);
1121 }
1122 memcpy(pages, data_pages + i,
1123 locked_pages * sizeof(*pages));
1124 memset(data_pages + i, 0,
1125 locked_pages * sizeof(*pages));
1126 } else {
1127 BUG_ON(num_ops != req->r_num_ops);
1128 index = pages[i - 1]->index + 1;
1129 /* request message now owns the pages array */
1130 pages = NULL;
1131 }
1132
1133 req->r_mtime = inode->i_mtime;
1134 rc = ceph_osdc_start_request(&fsc->client->osdc, req, true);
1135 BUG_ON(rc);
1136 req = NULL;
1137
1138 wbc->nr_to_write -= i;
1139 if (pages)
1140 goto new_request;
1141
1142 /*
1143 * We stop writing back only if we are not doing
1144 * integrity sync. In case of integrity sync we have to
1145 * keep going until we have written all the pages
1146 * we tagged for writeback prior to entering this loop.
1147 */
1148 if (wbc->nr_to_write <= 0 && wbc->sync_mode == WB_SYNC_NONE)
1149 done = stop = true;
1150
1151 release_pvec_pages:
1152 dout("pagevec_release on %d pages (%p)\n", (int)pvec.nr,
1153 pvec.nr ? pvec.pages[0] : NULL);
1154 pagevec_release(&pvec);
1155 }
1156
1157 if (should_loop && !done) {
1158 /* more to do; loop back to beginning of file */
1159 dout("writepages looping back to beginning of file\n");
1160 end = start_index - 1; /* OK even when start_index == 0 */
1161
1162 /* to write dirty pages associated with next snapc,
1163 * we need to wait until current writes complete */
1164 if (wbc->sync_mode != WB_SYNC_NONE &&
1165 start_index == 0 && /* all dirty pages were checked */
1166 !ceph_wbc.head_snapc) {
1167 struct page *page;
1168 unsigned i, nr;
1169 index = 0;
1170 while ((index <= end) &&
1171 (nr = pagevec_lookup_tag(&pvec, mapping, &index,
1172 PAGECACHE_TAG_WRITEBACK))) {
1173 for (i = 0; i < nr; i++) {
1174 page = pvec.pages[i];
1175 if (page_snap_context(page) != snapc)
1176 continue;
1177 wait_on_page_writeback(page);
1178 }
1179 pagevec_release(&pvec);
1180 cond_resched();
1181 }
1182 }
1183
1184 start_index = 0;
1185 index = 0;
1186 goto retry;
1187 }
1188
1189 if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
1190 mapping->writeback_index = index;
1191
1192 out:
1193 ceph_osdc_put_request(req);
1194 ceph_put_snap_context(last_snapc);
1195 dout("writepages dend - startone, rc = %d\n", rc);
1196 return rc;
1197 }
1198
1199
1200
1201 /*
1202 * See if a given @snapc is either writeable, or already written.
1203 */
1204 static int context_is_writeable_or_written(struct inode *inode,
1205 struct ceph_snap_context *snapc)
1206 {
1207 struct ceph_snap_context *oldest = get_oldest_context(inode, NULL, NULL);
1208 int ret = !oldest || snapc->seq <= oldest->seq;
1209
1210 ceph_put_snap_context(oldest);
1211 return ret;
1212 }
1213
1214 /*
1215 * We are only allowed to write into/dirty the page if the page is
1216 * clean, or already dirty within the same snap context.
1217 *
1218 * called with page locked.
1219 * return success with page locked,
1220 * or any failure (incl -EAGAIN) with page unlocked.
1221 */
1222 static int ceph_update_writeable_page(struct file *file,
1223 loff_t pos, unsigned len,
1224 struct page *page)
1225 {
1226 struct inode *inode = file_inode(file);
1227 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1228 struct ceph_inode_info *ci = ceph_inode(inode);
1229 loff_t page_off = pos & PAGE_MASK;
1230 int pos_in_page = pos & ~PAGE_MASK;
1231 int end_in_page = pos_in_page + len;
1232 loff_t i_size;
1233 int r;
1234 struct ceph_snap_context *snapc, *oldest;
1235
1236 if (READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
1237 dout(" page %p forced umount\n", page);
1238 unlock_page(page);
1239 return -EIO;
1240 }
1241
1242 retry_locked:
1243 /* writepages currently holds page lock, but if we change that later, */
1244 wait_on_page_writeback(page);
1245
1246 snapc = page_snap_context(page);
1247 if (snapc && snapc != ci->i_head_snapc) {
1248 /*
1249 * this page is already dirty in another (older) snap
1250 * context! is it writeable now?
1251 */
1252 oldest = get_oldest_context(inode, NULL, NULL);
1253 if (snapc->seq > oldest->seq) {
1254 ceph_put_snap_context(oldest);
1255 dout(" page %p snapc %p not current or oldest\n",
1256 page, snapc);
1257 /*
1258 * queue for writeback, and wait for snapc to
1259 * be writeable or written
1260 */
1261 snapc = ceph_get_snap_context(snapc);
1262 unlock_page(page);
1263 ceph_queue_writeback(inode);
1264 r = wait_event_killable(ci->i_cap_wq,
1265 context_is_writeable_or_written(inode, snapc));
1266 ceph_put_snap_context(snapc);
1267 if (r == -ERESTARTSYS)
1268 return r;
1269 return -EAGAIN;
1270 }
1271 ceph_put_snap_context(oldest);
1272
1273 /* yay, writeable, do it now (without dropping page lock) */
1274 dout(" page %p snapc %p not current, but oldest\n",
1275 page, snapc);
1276 if (!clear_page_dirty_for_io(page))
1277 goto retry_locked;
1278 r = writepage_nounlock(page, NULL);
1279 if (r < 0)
1280 goto fail_unlock;
1281 goto retry_locked;
1282 }
1283
1284 if (PageUptodate(page)) {
1285 dout(" page %p already uptodate\n", page);
1286 return 0;
1287 }
1288
1289 /* full page? */
1290 if (pos_in_page == 0 && len == PAGE_SIZE)
1291 return 0;
1292
1293 /* past end of file? */
1294 i_size = i_size_read(inode);
1295
1296 if (page_off >= i_size ||
1297 (pos_in_page == 0 && (pos+len) >= i_size &&
1298 end_in_page - pos_in_page != PAGE_SIZE)) {
1299 dout(" zeroing %p 0 - %d and %d - %d\n",
1300 page, pos_in_page, end_in_page, (int)PAGE_SIZE);
1301 zero_user_segments(page,
1302 0, pos_in_page,
1303 end_in_page, PAGE_SIZE);
1304 return 0;
1305 }
1306
1307 /* we need to read it. */
1308 r = ceph_do_readpage(file, page);
1309 if (r < 0) {
1310 if (r == -EINPROGRESS)
1311 return -EAGAIN;
1312 goto fail_unlock;
1313 }
1314 goto retry_locked;
1315 fail_unlock:
1316 unlock_page(page);
1317 return r;
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 */
1324 static int ceph_write_begin(struct file *file, struct address_space *mapping,
1325 loff_t pos, unsigned len, unsigned flags,
1326 struct page **pagep, void **fsdata)
1327 {
1328 struct inode *inode = file_inode(file);
1329 struct page *page;
1330 pgoff_t index = pos >> PAGE_SHIFT;
1331 int r;
1332
1333 do {
1334 /* get a page */
1335 page = grab_cache_page_write_begin(mapping, index, 0);
1336 if (!page)
1337 return -ENOMEM;
1338
1339 dout("write_begin file %p inode %p page %p %d~%d\n", file,
1340 inode, page, (int)pos, (int)len);
1341
1342 r = ceph_update_writeable_page(file, pos, len, page);
1343 if (r < 0)
1344 put_page(page);
1345 else
1346 *pagep = page;
1347 } while (r == -EAGAIN);
1348
1349 return r;
1350 }
1351
1352 /*
1353 * we don't do anything in here that simple_write_end doesn't do
1354 * except adjust dirty page accounting
1355 */
1356 static int ceph_write_end(struct file *file, struct address_space *mapping,
1357 loff_t pos, unsigned len, unsigned copied,
1358 struct page *page, void *fsdata)
1359 {
1360 struct inode *inode = file_inode(file);
1361 bool check_cap = false;
1362
1363 dout("write_end file %p inode %p page %p %d~%d (%d)\n", file,
1364 inode, page, (int)pos, (int)copied, (int)len);
1365
1366 /* zero the stale part of the page if we did a short copy */
1367 if (!PageUptodate(page)) {
1368 if (copied < len) {
1369 copied = 0;
1370 goto out;
1371 }
1372 SetPageUptodate(page);
1373 }
1374
1375 /* did file size increase? */
1376 if (pos+copied > i_size_read(inode))
1377 check_cap = ceph_inode_set_size(inode, pos+copied);
1378
1379 set_page_dirty(page);
1380
1381 out:
1382 unlock_page(page);
1383 put_page(page);
1384
1385 if (check_cap)
1386 ceph_check_caps(ceph_inode(inode), CHECK_CAPS_AUTHONLY, NULL);
1387
1388 return copied;
1389 }
1390
1391 /*
1392 * we set .direct_IO to indicate direct io is supported, but since we
1393 * intercept O_DIRECT reads and writes early, this function should
1394 * never get called.
1395 */
1396 static ssize_t ceph_direct_io(struct kiocb *iocb, struct iov_iter *iter)
1397 {
1398 WARN_ON(1);
1399 return -EINVAL;
1400 }
1401
1402 const struct address_space_operations ceph_aops = {
1403 .readpage = ceph_readpage,
1404 .readpages = ceph_readpages,
1405 .writepage = ceph_writepage,
1406 .writepages = ceph_writepages_start,
1407 .write_begin = ceph_write_begin,
1408 .write_end = ceph_write_end,
1409 .set_page_dirty = ceph_set_page_dirty,
1410 .invalidatepage = ceph_invalidatepage,
1411 .releasepage = ceph_releasepage,
1412 .direct_IO = ceph_direct_io,
1413 };
1414
1415 static void ceph_block_sigs(sigset_t *oldset)
1416 {
1417 sigset_t mask;
1418 siginitsetinv(&mask, sigmask(SIGKILL));
1419 sigprocmask(SIG_BLOCK, &mask, oldset);
1420 }
1421
1422 static void ceph_restore_sigs(sigset_t *oldset)
1423 {
1424 sigprocmask(SIG_SETMASK, oldset, NULL);
1425 }
1426
1427 /*
1428 * vm ops
1429 */
1430 static int ceph_filemap_fault(struct vm_fault *vmf)
1431 {
1432 struct vm_area_struct *vma = vmf->vma;
1433 struct inode *inode = file_inode(vma->vm_file);
1434 struct ceph_inode_info *ci = ceph_inode(inode);
1435 struct ceph_file_info *fi = vma->vm_file->private_data;
1436 struct page *pinned_page = NULL;
1437 loff_t off = vmf->pgoff << PAGE_SHIFT;
1438 int want, got, ret;
1439 sigset_t oldset;
1440
1441 ceph_block_sigs(&oldset);
1442
1443 dout("filemap_fault %p %llx.%llx %llu~%zd trying to get caps\n",
1444 inode, ceph_vinop(inode), off, (size_t)PAGE_SIZE);
1445 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1446 want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
1447 else
1448 want = CEPH_CAP_FILE_CACHE;
1449
1450 got = 0;
1451 ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, -1, &got, &pinned_page);
1452 if (ret < 0)
1453 goto out_restore;
1454
1455 dout("filemap_fault %p %llu~%zd got cap refs on %s\n",
1456 inode, off, (size_t)PAGE_SIZE, ceph_cap_string(got));
1457
1458 if ((got & (CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO)) ||
1459 ci->i_inline_version == CEPH_INLINE_NONE) {
1460 CEPH_DEFINE_RW_CONTEXT(rw_ctx, got);
1461 ceph_add_rw_context(fi, &rw_ctx);
1462 ret = filemap_fault(vmf);
1463 ceph_del_rw_context(fi, &rw_ctx);
1464 } else
1465 ret = -EAGAIN;
1466
1467 dout("filemap_fault %p %llu~%zd dropping cap refs on %s ret %d\n",
1468 inode, off, (size_t)PAGE_SIZE, ceph_cap_string(got), ret);
1469 if (pinned_page)
1470 put_page(pinned_page);
1471 ceph_put_cap_refs(ci, got);
1472
1473 if (ret != -EAGAIN)
1474 goto out_restore;
1475
1476 /* read inline data */
1477 if (off >= PAGE_SIZE) {
1478 /* does not support inline data > PAGE_SIZE */
1479 ret = VM_FAULT_SIGBUS;
1480 } else {
1481 int ret1;
1482 struct address_space *mapping = inode->i_mapping;
1483 struct page *page = find_or_create_page(mapping, 0,
1484 mapping_gfp_constraint(mapping,
1485 ~__GFP_FS));
1486 if (!page) {
1487 ret = VM_FAULT_OOM;
1488 goto out_inline;
1489 }
1490 ret1 = __ceph_do_getattr(inode, page,
1491 CEPH_STAT_CAP_INLINE_DATA, true);
1492 if (ret1 < 0 || off >= i_size_read(inode)) {
1493 unlock_page(page);
1494 put_page(page);
1495 if (ret1 < 0)
1496 ret = ret1;
1497 else
1498 ret = VM_FAULT_SIGBUS;
1499 goto out_inline;
1500 }
1501 if (ret1 < PAGE_SIZE)
1502 zero_user_segment(page, ret1, PAGE_SIZE);
1503 else
1504 flush_dcache_page(page);
1505 SetPageUptodate(page);
1506 vmf->page = page;
1507 ret = VM_FAULT_MAJOR | VM_FAULT_LOCKED;
1508 out_inline:
1509 dout("filemap_fault %p %llu~%zd read inline data ret %d\n",
1510 inode, off, (size_t)PAGE_SIZE, ret);
1511 }
1512 out_restore:
1513 ceph_restore_sigs(&oldset);
1514 if (ret < 0)
1515 ret = (ret == -ENOMEM) ? VM_FAULT_OOM : VM_FAULT_SIGBUS;
1516
1517 return ret;
1518 }
1519
1520 /*
1521 * Reuse write_begin here for simplicity.
1522 */
1523 static int ceph_page_mkwrite(struct vm_fault *vmf)
1524 {
1525 struct vm_area_struct *vma = vmf->vma;
1526 struct inode *inode = file_inode(vma->vm_file);
1527 struct ceph_inode_info *ci = ceph_inode(inode);
1528 struct ceph_file_info *fi = vma->vm_file->private_data;
1529 struct ceph_cap_flush *prealloc_cf;
1530 struct page *page = vmf->page;
1531 loff_t off = page_offset(page);
1532 loff_t size = i_size_read(inode);
1533 size_t len;
1534 int want, got, ret;
1535 sigset_t oldset;
1536
1537 prealloc_cf = ceph_alloc_cap_flush();
1538 if (!prealloc_cf)
1539 return VM_FAULT_OOM;
1540
1541 ceph_block_sigs(&oldset);
1542
1543 if (ci->i_inline_version != CEPH_INLINE_NONE) {
1544 struct page *locked_page = NULL;
1545 if (off == 0) {
1546 lock_page(page);
1547 locked_page = page;
1548 }
1549 ret = ceph_uninline_data(vma->vm_file, locked_page);
1550 if (locked_page)
1551 unlock_page(locked_page);
1552 if (ret < 0)
1553 goto out_free;
1554 }
1555
1556 if (off + PAGE_SIZE <= size)
1557 len = PAGE_SIZE;
1558 else
1559 len = size & ~PAGE_MASK;
1560
1561 dout("page_mkwrite %p %llx.%llx %llu~%zd getting caps i_size %llu\n",
1562 inode, ceph_vinop(inode), off, len, size);
1563 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1564 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
1565 else
1566 want = CEPH_CAP_FILE_BUFFER;
1567
1568 got = 0;
1569 ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, off + len,
1570 &got, NULL);
1571 if (ret < 0)
1572 goto out_free;
1573
1574 dout("page_mkwrite %p %llu~%zd got cap refs on %s\n",
1575 inode, off, len, ceph_cap_string(got));
1576
1577 /* Update time before taking page lock */
1578 file_update_time(vma->vm_file);
1579
1580 do {
1581 lock_page(page);
1582
1583 if ((off > size) || (page->mapping != inode->i_mapping)) {
1584 unlock_page(page);
1585 ret = VM_FAULT_NOPAGE;
1586 break;
1587 }
1588
1589 ret = ceph_update_writeable_page(vma->vm_file, off, len, page);
1590 if (ret >= 0) {
1591 /* success. we'll keep the page locked. */
1592 set_page_dirty(page);
1593 ret = VM_FAULT_LOCKED;
1594 }
1595 } while (ret == -EAGAIN);
1596
1597 if (ret == VM_FAULT_LOCKED ||
1598 ci->i_inline_version != CEPH_INLINE_NONE) {
1599 int dirty;
1600 spin_lock(&ci->i_ceph_lock);
1601 ci->i_inline_version = CEPH_INLINE_NONE;
1602 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
1603 &prealloc_cf);
1604 spin_unlock(&ci->i_ceph_lock);
1605 if (dirty)
1606 __mark_inode_dirty(inode, dirty);
1607 }
1608
1609 dout("page_mkwrite %p %llu~%zd dropping cap refs on %s ret %d\n",
1610 inode, off, len, ceph_cap_string(got), ret);
1611 ceph_put_cap_refs(ci, got);
1612 out_free:
1613 ceph_restore_sigs(&oldset);
1614 ceph_free_cap_flush(prealloc_cf);
1615 if (ret < 0)
1616 ret = (ret == -ENOMEM) ? VM_FAULT_OOM : VM_FAULT_SIGBUS;
1617 return ret;
1618 }
1619
1620 void ceph_fill_inline_data(struct inode *inode, struct page *locked_page,
1621 char *data, size_t len)
1622 {
1623 struct address_space *mapping = inode->i_mapping;
1624 struct page *page;
1625
1626 if (locked_page) {
1627 page = locked_page;
1628 } else {
1629 if (i_size_read(inode) == 0)
1630 return;
1631 page = find_or_create_page(mapping, 0,
1632 mapping_gfp_constraint(mapping,
1633 ~__GFP_FS));
1634 if (!page)
1635 return;
1636 if (PageUptodate(page)) {
1637 unlock_page(page);
1638 put_page(page);
1639 return;
1640 }
1641 }
1642
1643 dout("fill_inline_data %p %llx.%llx len %zu locked_page %p\n",
1644 inode, ceph_vinop(inode), len, locked_page);
1645
1646 if (len > 0) {
1647 void *kaddr = kmap_atomic(page);
1648 memcpy(kaddr, data, len);
1649 kunmap_atomic(kaddr);
1650 }
1651
1652 if (page != locked_page) {
1653 if (len < PAGE_SIZE)
1654 zero_user_segment(page, len, PAGE_SIZE);
1655 else
1656 flush_dcache_page(page);
1657
1658 SetPageUptodate(page);
1659 unlock_page(page);
1660 put_page(page);
1661 }
1662 }
1663
1664 int ceph_uninline_data(struct file *filp, struct page *locked_page)
1665 {
1666 struct inode *inode = file_inode(filp);
1667 struct ceph_inode_info *ci = ceph_inode(inode);
1668 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1669 struct ceph_osd_request *req;
1670 struct page *page = NULL;
1671 u64 len, inline_version;
1672 int err = 0;
1673 bool from_pagecache = false;
1674
1675 spin_lock(&ci->i_ceph_lock);
1676 inline_version = ci->i_inline_version;
1677 spin_unlock(&ci->i_ceph_lock);
1678
1679 dout("uninline_data %p %llx.%llx inline_version %llu\n",
1680 inode, ceph_vinop(inode), inline_version);
1681
1682 if (inline_version == 1 || /* initial version, no data */
1683 inline_version == CEPH_INLINE_NONE)
1684 goto out;
1685
1686 if (locked_page) {
1687 page = locked_page;
1688 WARN_ON(!PageUptodate(page));
1689 } else if (ceph_caps_issued(ci) &
1690 (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) {
1691 page = find_get_page(inode->i_mapping, 0);
1692 if (page) {
1693 if (PageUptodate(page)) {
1694 from_pagecache = true;
1695 lock_page(page);
1696 } else {
1697 put_page(page);
1698 page = NULL;
1699 }
1700 }
1701 }
1702
1703 if (page) {
1704 len = i_size_read(inode);
1705 if (len > PAGE_SIZE)
1706 len = PAGE_SIZE;
1707 } else {
1708 page = __page_cache_alloc(GFP_NOFS);
1709 if (!page) {
1710 err = -ENOMEM;
1711 goto out;
1712 }
1713 err = __ceph_do_getattr(inode, page,
1714 CEPH_STAT_CAP_INLINE_DATA, true);
1715 if (err < 0) {
1716 /* no inline data */
1717 if (err == -ENODATA)
1718 err = 0;
1719 goto out;
1720 }
1721 len = err;
1722 }
1723
1724 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1725 ceph_vino(inode), 0, &len, 0, 1,
1726 CEPH_OSD_OP_CREATE, CEPH_OSD_FLAG_WRITE,
1727 NULL, 0, 0, false);
1728 if (IS_ERR(req)) {
1729 err = PTR_ERR(req);
1730 goto out;
1731 }
1732
1733 req->r_mtime = inode->i_mtime;
1734 err = ceph_osdc_start_request(&fsc->client->osdc, req, false);
1735 if (!err)
1736 err = ceph_osdc_wait_request(&fsc->client->osdc, req);
1737 ceph_osdc_put_request(req);
1738 if (err < 0)
1739 goto out;
1740
1741 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1742 ceph_vino(inode), 0, &len, 1, 3,
1743 CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE,
1744 NULL, ci->i_truncate_seq,
1745 ci->i_truncate_size, false);
1746 if (IS_ERR(req)) {
1747 err = PTR_ERR(req);
1748 goto out;
1749 }
1750
1751 osd_req_op_extent_osd_data_pages(req, 1, &page, len, 0, false, false);
1752
1753 {
1754 __le64 xattr_buf = cpu_to_le64(inline_version);
1755 err = osd_req_op_xattr_init(req, 0, CEPH_OSD_OP_CMPXATTR,
1756 "inline_version", &xattr_buf,
1757 sizeof(xattr_buf),
1758 CEPH_OSD_CMPXATTR_OP_GT,
1759 CEPH_OSD_CMPXATTR_MODE_U64);
1760 if (err)
1761 goto out_put;
1762 }
1763
1764 {
1765 char xattr_buf[32];
1766 int xattr_len = snprintf(xattr_buf, sizeof(xattr_buf),
1767 "%llu", inline_version);
1768 err = osd_req_op_xattr_init(req, 2, CEPH_OSD_OP_SETXATTR,
1769 "inline_version",
1770 xattr_buf, xattr_len, 0, 0);
1771 if (err)
1772 goto out_put;
1773 }
1774
1775 req->r_mtime = inode->i_mtime;
1776 err = ceph_osdc_start_request(&fsc->client->osdc, req, false);
1777 if (!err)
1778 err = ceph_osdc_wait_request(&fsc->client->osdc, req);
1779 out_put:
1780 ceph_osdc_put_request(req);
1781 if (err == -ECANCELED)
1782 err = 0;
1783 out:
1784 if (page && page != locked_page) {
1785 if (from_pagecache) {
1786 unlock_page(page);
1787 put_page(page);
1788 } else
1789 __free_pages(page, 0);
1790 }
1791
1792 dout("uninline_data %p %llx.%llx inline_version %llu = %d\n",
1793 inode, ceph_vinop(inode), inline_version, err);
1794 return err;
1795 }
1796
1797 static const struct vm_operations_struct ceph_vmops = {
1798 .fault = ceph_filemap_fault,
1799 .page_mkwrite = ceph_page_mkwrite,
1800 };
1801
1802 int ceph_mmap(struct file *file, struct vm_area_struct *vma)
1803 {
1804 struct address_space *mapping = file->f_mapping;
1805
1806 if (!mapping->a_ops->readpage)
1807 return -ENOEXEC;
1808 file_accessed(file);
1809 vma->vm_ops = &ceph_vmops;
1810 return 0;
1811 }
1812
1813 enum {
1814 POOL_READ = 1,
1815 POOL_WRITE = 2,
1816 };
1817
1818 static int __ceph_pool_perm_get(struct ceph_inode_info *ci,
1819 s64 pool, struct ceph_string *pool_ns)
1820 {
1821 struct ceph_fs_client *fsc = ceph_inode_to_client(&ci->vfs_inode);
1822 struct ceph_mds_client *mdsc = fsc->mdsc;
1823 struct ceph_osd_request *rd_req = NULL, *wr_req = NULL;
1824 struct rb_node **p, *parent;
1825 struct ceph_pool_perm *perm;
1826 struct page **pages;
1827 size_t pool_ns_len;
1828 int err = 0, err2 = 0, have = 0;
1829
1830 down_read(&mdsc->pool_perm_rwsem);
1831 p = &mdsc->pool_perm_tree.rb_node;
1832 while (*p) {
1833 perm = rb_entry(*p, struct ceph_pool_perm, node);
1834 if (pool < perm->pool)
1835 p = &(*p)->rb_left;
1836 else if (pool > perm->pool)
1837 p = &(*p)->rb_right;
1838 else {
1839 int ret = ceph_compare_string(pool_ns,
1840 perm->pool_ns,
1841 perm->pool_ns_len);
1842 if (ret < 0)
1843 p = &(*p)->rb_left;
1844 else if (ret > 0)
1845 p = &(*p)->rb_right;
1846 else {
1847 have = perm->perm;
1848 break;
1849 }
1850 }
1851 }
1852 up_read(&mdsc->pool_perm_rwsem);
1853 if (*p)
1854 goto out;
1855
1856 if (pool_ns)
1857 dout("__ceph_pool_perm_get pool %lld ns %.*s no perm cached\n",
1858 pool, (int)pool_ns->len, pool_ns->str);
1859 else
1860 dout("__ceph_pool_perm_get pool %lld no perm cached\n", pool);
1861
1862 down_write(&mdsc->pool_perm_rwsem);
1863 p = &mdsc->pool_perm_tree.rb_node;
1864 parent = NULL;
1865 while (*p) {
1866 parent = *p;
1867 perm = rb_entry(parent, struct ceph_pool_perm, node);
1868 if (pool < perm->pool)
1869 p = &(*p)->rb_left;
1870 else if (pool > perm->pool)
1871 p = &(*p)->rb_right;
1872 else {
1873 int ret = ceph_compare_string(pool_ns,
1874 perm->pool_ns,
1875 perm->pool_ns_len);
1876 if (ret < 0)
1877 p = &(*p)->rb_left;
1878 else if (ret > 0)
1879 p = &(*p)->rb_right;
1880 else {
1881 have = perm->perm;
1882 break;
1883 }
1884 }
1885 }
1886 if (*p) {
1887 up_write(&mdsc->pool_perm_rwsem);
1888 goto out;
1889 }
1890
1891 rd_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL,
1892 1, false, GFP_NOFS);
1893 if (!rd_req) {
1894 err = -ENOMEM;
1895 goto out_unlock;
1896 }
1897
1898 rd_req->r_flags = CEPH_OSD_FLAG_READ;
1899 osd_req_op_init(rd_req, 0, CEPH_OSD_OP_STAT, 0);
1900 rd_req->r_base_oloc.pool = pool;
1901 if (pool_ns)
1902 rd_req->r_base_oloc.pool_ns = ceph_get_string(pool_ns);
1903 ceph_oid_printf(&rd_req->r_base_oid, "%llx.00000000", ci->i_vino.ino);
1904
1905 err = ceph_osdc_alloc_messages(rd_req, GFP_NOFS);
1906 if (err)
1907 goto out_unlock;
1908
1909 wr_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL,
1910 1, false, GFP_NOFS);
1911 if (!wr_req) {
1912 err = -ENOMEM;
1913 goto out_unlock;
1914 }
1915
1916 wr_req->r_flags = CEPH_OSD_FLAG_WRITE;
1917 osd_req_op_init(wr_req, 0, CEPH_OSD_OP_CREATE, CEPH_OSD_OP_FLAG_EXCL);
1918 ceph_oloc_copy(&wr_req->r_base_oloc, &rd_req->r_base_oloc);
1919 ceph_oid_copy(&wr_req->r_base_oid, &rd_req->r_base_oid);
1920
1921 err = ceph_osdc_alloc_messages(wr_req, GFP_NOFS);
1922 if (err)
1923 goto out_unlock;
1924
1925 /* one page should be large enough for STAT data */
1926 pages = ceph_alloc_page_vector(1, GFP_KERNEL);
1927 if (IS_ERR(pages)) {
1928 err = PTR_ERR(pages);
1929 goto out_unlock;
1930 }
1931
1932 osd_req_op_raw_data_in_pages(rd_req, 0, pages, PAGE_SIZE,
1933 0, false, true);
1934 err = ceph_osdc_start_request(&fsc->client->osdc, rd_req, false);
1935
1936 wr_req->r_mtime = ci->vfs_inode.i_mtime;
1937 wr_req->r_abort_on_full = true;
1938 err2 = ceph_osdc_start_request(&fsc->client->osdc, wr_req, false);
1939
1940 if (!err)
1941 err = ceph_osdc_wait_request(&fsc->client->osdc, rd_req);
1942 if (!err2)
1943 err2 = ceph_osdc_wait_request(&fsc->client->osdc, wr_req);
1944
1945 if (err >= 0 || err == -ENOENT)
1946 have |= POOL_READ;
1947 else if (err != -EPERM)
1948 goto out_unlock;
1949
1950 if (err2 == 0 || err2 == -EEXIST)
1951 have |= POOL_WRITE;
1952 else if (err2 != -EPERM) {
1953 err = err2;
1954 goto out_unlock;
1955 }
1956
1957 pool_ns_len = pool_ns ? pool_ns->len : 0;
1958 perm = kmalloc(sizeof(*perm) + pool_ns_len + 1, GFP_NOFS);
1959 if (!perm) {
1960 err = -ENOMEM;
1961 goto out_unlock;
1962 }
1963
1964 perm->pool = pool;
1965 perm->perm = have;
1966 perm->pool_ns_len = pool_ns_len;
1967 if (pool_ns_len > 0)
1968 memcpy(perm->pool_ns, pool_ns->str, pool_ns_len);
1969 perm->pool_ns[pool_ns_len] = 0;
1970
1971 rb_link_node(&perm->node, parent, p);
1972 rb_insert_color(&perm->node, &mdsc->pool_perm_tree);
1973 err = 0;
1974 out_unlock:
1975 up_write(&mdsc->pool_perm_rwsem);
1976
1977 ceph_osdc_put_request(rd_req);
1978 ceph_osdc_put_request(wr_req);
1979 out:
1980 if (!err)
1981 err = have;
1982 if (pool_ns)
1983 dout("__ceph_pool_perm_get pool %lld ns %.*s result = %d\n",
1984 pool, (int)pool_ns->len, pool_ns->str, err);
1985 else
1986 dout("__ceph_pool_perm_get pool %lld result = %d\n", pool, err);
1987 return err;
1988 }
1989
1990 int ceph_pool_perm_check(struct ceph_inode_info *ci, int need)
1991 {
1992 s64 pool;
1993 struct ceph_string *pool_ns;
1994 int ret, flags;
1995
1996 if (ci->i_vino.snap != CEPH_NOSNAP) {
1997 /*
1998 * Pool permission check needs to write to the first object.
1999 * But for snapshot, head of the first object may have alread
2000 * been deleted. Skip check to avoid creating orphan object.
2001 */
2002 return 0;
2003 }
2004
2005 if (ceph_test_mount_opt(ceph_inode_to_client(&ci->vfs_inode),
2006 NOPOOLPERM))
2007 return 0;
2008
2009 spin_lock(&ci->i_ceph_lock);
2010 flags = ci->i_ceph_flags;
2011 pool = ci->i_layout.pool_id;
2012 spin_unlock(&ci->i_ceph_lock);
2013 check:
2014 if (flags & CEPH_I_POOL_PERM) {
2015 if ((need & CEPH_CAP_FILE_RD) && !(flags & CEPH_I_POOL_RD)) {
2016 dout("ceph_pool_perm_check pool %lld no read perm\n",
2017 pool);
2018 return -EPERM;
2019 }
2020 if ((need & CEPH_CAP_FILE_WR) && !(flags & CEPH_I_POOL_WR)) {
2021 dout("ceph_pool_perm_check pool %lld no write perm\n",
2022 pool);
2023 return -EPERM;
2024 }
2025 return 0;
2026 }
2027
2028 pool_ns = ceph_try_get_string(ci->i_layout.pool_ns);
2029 ret = __ceph_pool_perm_get(ci, pool, pool_ns);
2030 ceph_put_string(pool_ns);
2031 if (ret < 0)
2032 return ret;
2033
2034 flags = CEPH_I_POOL_PERM;
2035 if (ret & POOL_READ)
2036 flags |= CEPH_I_POOL_RD;
2037 if (ret & POOL_WRITE)
2038 flags |= CEPH_I_POOL_WR;
2039
2040 spin_lock(&ci->i_ceph_lock);
2041 if (pool == ci->i_layout.pool_id &&
2042 pool_ns == rcu_dereference_raw(ci->i_layout.pool_ns)) {
2043 ci->i_ceph_flags |= flags;
2044 } else {
2045 pool = ci->i_layout.pool_id;
2046 flags = ci->i_ceph_flags;
2047 }
2048 spin_unlock(&ci->i_ceph_lock);
2049 goto check;
2050 }
2051
2052 void ceph_pool_perm_destroy(struct ceph_mds_client *mdsc)
2053 {
2054 struct ceph_pool_perm *perm;
2055 struct rb_node *n;
2056
2057 while (!RB_EMPTY_ROOT(&mdsc->pool_perm_tree)) {
2058 n = rb_first(&mdsc->pool_perm_tree);
2059 perm = rb_entry(n, struct ceph_pool_perm, node);
2060 rb_erase(n, &mdsc->pool_perm_tree);
2061 kfree(perm);
2062 }
2063 }
CRIS linux kernel tree