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