1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/ceph/ceph_debug.h>
4 #include <linux/backing-dev.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>
15 #include "mds_client.h"
17 #include <linux/ceph/osd_client.h>
18 #include <linux/ceph/striper.h>
21 * Ceph address space ops.
23 * There are a few funny things going on here.
25 * The page->private field is used to reference a struct
26 * ceph_snap_context for _every_ dirty page. This indicates which
27 * snapshot the page was logically dirtied in, and thus which snap
28 * context needs to be associated with the osd write during writeback.
30 * Similarly, struct ceph_inode_info maintains a set of counters to
31 * count dirty pages on the inode. In the absence of snapshots,
32 * i_wrbuffer_ref == i_wrbuffer_ref_head == the dirty page count.
34 * When a snapshot is taken (that is, when the client receives
35 * notification that a snapshot was taken), each inode with caps and
36 * with dirty pages (dirty pages implies there is a cap) gets a new
37 * ceph_cap_snap in the i_cap_snaps list (which is sorted in ascending
38 * order, new snaps go to the tail). The i_wrbuffer_ref_head count is
39 * moved to capsnap->dirty. (Unless a sync write is currently in
40 * progress. In that case, the capsnap is said to be "pending", new
41 * writes cannot start, and the capsnap isn't "finalized" until the
42 * write completes (or fails) and a final size/mtime for the inode for
43 * that snap can be settled upon.) i_wrbuffer_ref_head is reset to 0.
45 * On writeback, we must submit writes to the osd IN SNAP ORDER. So,
46 * we look for the first capsnap in i_cap_snaps and write out pages in
47 * that snap context _only_. Then we move on to the next capsnap,
48 * eventually reaching the "live" or "head" context (i.e., pages that
49 * are not yet snapped) and are writing the most recently dirtied
52 * Invalidate and so forth must take care to ensure the dirty page
53 * accounting is preserved.
56 #define CONGESTION_ON_THRESH(congestion_kb) (congestion_kb >> (PAGE_SHIFT-10))
57 #define CONGESTION_OFF_THRESH(congestion_kb) \
58 (CONGESTION_ON_THRESH(congestion_kb) - \
59 (CONGESTION_ON_THRESH(congestion_kb) >> 2))
61 static inline struct ceph_snap_context *page_snap_context(struct page *page)
63 if (PagePrivate(page))
64 return (void *)page->private;
69 * Dirty a page. Optimistically adjust accounting, on the assumption
70 * that we won't race with invalidate. If we do, readjust.
72 static int ceph_set_page_dirty(struct page *page)
74 struct address_space *mapping = page->mapping;
76 struct ceph_inode_info *ci;
77 struct ceph_snap_context *snapc;
79 if (PageDirty(page)) {
80 dout("%p set_page_dirty %p idx %lu -- already dirty\n",
81 mapping->host, page, page->index);
82 BUG_ON(!PagePrivate(page));
86 inode = mapping->host;
87 ci = ceph_inode(inode);
90 spin_lock(&ci->i_ceph_lock);
91 BUG_ON(ci->i_wr_ref == 0); // caller should hold Fw reference
92 if (__ceph_have_pending_cap_snap(ci)) {
93 struct ceph_cap_snap *capsnap =
94 list_last_entry(&ci->i_cap_snaps,
97 snapc = ceph_get_snap_context(capsnap->context);
98 capsnap->dirty_pages++;
100 BUG_ON(!ci->i_head_snapc);
101 snapc = ceph_get_snap_context(ci->i_head_snapc);
102 ++ci->i_wrbuffer_ref_head;
104 if (ci->i_wrbuffer_ref == 0)
106 ++ci->i_wrbuffer_ref;
107 dout("%p set_page_dirty %p idx %lu head %d/%d -> %d/%d "
108 "snapc %p seq %lld (%d snaps)\n",
109 mapping->host, page, page->index,
110 ci->i_wrbuffer_ref-1, ci->i_wrbuffer_ref_head-1,
111 ci->i_wrbuffer_ref, ci->i_wrbuffer_ref_head,
112 snapc, snapc->seq, snapc->num_snaps);
113 spin_unlock(&ci->i_ceph_lock);
116 * Reference snap context in page->private. Also set
117 * PagePrivate so that we get invalidatepage callback.
119 BUG_ON(PagePrivate(page));
120 page->private = (unsigned long)snapc;
121 SetPagePrivate(page);
123 return __set_page_dirty_nobuffers(page);
127 * If we are truncating the full page (i.e. offset == 0), adjust the
128 * dirty page counters appropriately. Only called if there is private
131 static void ceph_invalidatepage(struct page *page, unsigned int offset,
135 struct ceph_inode_info *ci;
136 struct ceph_snap_context *snapc = page_snap_context(page);
138 inode = page->mapping->host;
139 ci = ceph_inode(inode);
141 if (offset != 0 || length != PAGE_SIZE) {
142 dout("%p invalidatepage %p idx %lu partial dirty page %u~%u\n",
143 inode, page, page->index, offset, length);
147 ceph_invalidate_fscache_page(inode, page);
149 WARN_ON(!PageLocked(page));
150 if (!PagePrivate(page))
153 ClearPageChecked(page);
155 dout("%p invalidatepage %p idx %lu full dirty page\n",
156 inode, page, page->index);
158 ceph_put_wrbuffer_cap_refs(ci, 1, snapc);
159 ceph_put_snap_context(snapc);
161 ClearPagePrivate(page);
164 static int ceph_releasepage(struct page *page, gfp_t g)
166 dout("%p releasepage %p idx %lu (%sdirty)\n", page->mapping->host,
167 page, page->index, PageDirty(page) ? "" : "not ");
169 /* Can we release the page from the cache? */
170 if (!ceph_release_fscache_page(page, g))
173 return !PagePrivate(page);
177 * read a single page, without unlocking it.
179 static int ceph_do_readpage(struct file *filp, struct page *page)
181 struct inode *inode = file_inode(filp);
182 struct ceph_inode_info *ci = ceph_inode(inode);
183 struct ceph_osd_client *osdc =
184 &ceph_inode_to_client(inode)->client->osdc;
186 u64 off = page_offset(page);
189 if (off >= i_size_read(inode)) {
190 zero_user_segment(page, 0, PAGE_SIZE);
191 SetPageUptodate(page);
195 if (ci->i_inline_version != CEPH_INLINE_NONE) {
197 * Uptodate inline data should have been added
198 * into page cache while getting Fcr caps.
202 zero_user_segment(page, 0, PAGE_SIZE);
203 SetPageUptodate(page);
207 err = ceph_readpage_from_fscache(inode, page);
211 dout("readpage inode %p file %p page %p index %lu\n",
212 inode, filp, page, page->index);
213 err = ceph_osdc_readpages(osdc, ceph_vino(inode), &ci->i_layout,
215 ci->i_truncate_seq, ci->i_truncate_size,
221 ceph_fscache_readpage_cancel(inode, page);
225 /* zero fill remainder of page */
226 zero_user_segment(page, err, PAGE_SIZE);
228 flush_dcache_page(page);
230 SetPageUptodate(page);
231 ceph_readpage_to_fscache(inode, page);
234 return err < 0 ? err : 0;
237 static int ceph_readpage(struct file *filp, struct page *page)
239 int r = ceph_do_readpage(filp, page);
240 if (r != -EINPROGRESS)
248 * Finish an async read(ahead) op.
250 static void finish_read(struct ceph_osd_request *req)
252 struct inode *inode = req->r_inode;
253 struct ceph_osd_data *osd_data;
254 int rc = req->r_result <= 0 ? req->r_result : 0;
255 int bytes = req->r_result >= 0 ? req->r_result : 0;
259 dout("finish_read %p req %p rc %d bytes %d\n", inode, req, rc, bytes);
261 /* unlock all pages, zeroing any data we didn't read */
262 osd_data = osd_req_op_extent_osd_data(req, 0);
263 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES);
264 num_pages = calc_pages_for((u64)osd_data->alignment,
265 (u64)osd_data->length);
266 for (i = 0; i < num_pages; i++) {
267 struct page *page = osd_data->pages[i];
269 if (rc < 0 && rc != -ENOENT) {
270 ceph_fscache_readpage_cancel(inode, page);
273 if (bytes < (int)PAGE_SIZE) {
274 /* zero (remainder of) page */
275 int s = bytes < 0 ? 0 : bytes;
276 zero_user_segment(page, s, PAGE_SIZE);
278 dout("finish_read %p uptodate %p idx %lu\n", inode, page,
280 flush_dcache_page(page);
281 SetPageUptodate(page);
282 ceph_readpage_to_fscache(inode, page);
288 kfree(osd_data->pages);
292 * start an async read(ahead) operation. return nr_pages we submitted
293 * a read for on success, or negative error code.
295 static int start_read(struct inode *inode, struct ceph_rw_context *rw_ctx,
296 struct list_head *page_list, int max)
298 struct ceph_osd_client *osdc =
299 &ceph_inode_to_client(inode)->client->osdc;
300 struct ceph_inode_info *ci = ceph_inode(inode);
301 struct page *page = list_entry(page_list->prev, struct page, lru);
302 struct ceph_vino vino;
303 struct ceph_osd_request *req;
314 /* caller of readpages does not hold buffer and read caps
315 * (fadvise, madvise and readahead cases) */
316 int want = CEPH_CAP_FILE_CACHE;
317 ret = ceph_try_get_caps(ci, CEPH_CAP_FILE_RD, want, &got);
319 dout("start_read %p, error getting cap\n", inode);
320 } else if (!(got & want)) {
321 dout("start_read %p, no cache cap\n", inode);
326 ceph_put_cap_refs(ci, got);
327 while (!list_empty(page_list)) {
328 page = list_entry(page_list->prev,
330 list_del(&page->lru);
337 off = (u64) page_offset(page);
340 next_index = page->index;
341 list_for_each_entry_reverse(page, page_list, lru) {
342 if (page->index != next_index)
346 if (max && nr_pages == max)
349 len = nr_pages << PAGE_SHIFT;
350 dout("start_read %p nr_pages %d is %lld~%lld\n", inode, nr_pages,
352 vino = ceph_vino(inode);
353 req = ceph_osdc_new_request(osdc, &ci->i_layout, vino, off, &len,
354 0, 1, CEPH_OSD_OP_READ,
355 CEPH_OSD_FLAG_READ, NULL,
356 ci->i_truncate_seq, ci->i_truncate_size,
363 /* build page vector */
364 nr_pages = calc_pages_for(0, len);
365 pages = kmalloc_array(nr_pages, sizeof(*pages), GFP_KERNEL);
370 for (i = 0; i < nr_pages; ++i) {
371 page = list_entry(page_list->prev, struct page, lru);
372 BUG_ON(PageLocked(page));
373 list_del(&page->lru);
375 dout("start_read %p adding %p idx %lu\n", inode, page,
377 if (add_to_page_cache_lru(page, &inode->i_data, page->index,
379 ceph_fscache_uncache_page(inode, page);
381 dout("start_read %p add_to_page_cache failed %p\n",
385 len = nr_pages << PAGE_SHIFT;
386 osd_req_op_extent_update(req, 0, len);
393 osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0, false, false);
394 req->r_callback = finish_read;
395 req->r_inode = inode;
397 dout("start_read %p starting %p %lld~%lld\n", inode, req, off, len);
398 ret = ceph_osdc_start_request(osdc, req, false);
401 ceph_osdc_put_request(req);
403 /* After adding locked pages to page cache, the inode holds cache cap.
404 * So we can drop our cap refs. */
406 ceph_put_cap_refs(ci, got);
411 for (i = 0; i < nr_pages; ++i) {
412 ceph_fscache_readpage_cancel(inode, pages[i]);
413 unlock_page(pages[i]);
415 ceph_put_page_vector(pages, nr_pages, false);
417 ceph_osdc_put_request(req);
420 ceph_put_cap_refs(ci, got);
426 * Read multiple pages. Leave pages we don't read + unlock in page_list;
427 * the caller (VM) cleans them up.
429 static int ceph_readpages(struct file *file, struct address_space *mapping,
430 struct list_head *page_list, unsigned nr_pages)
432 struct inode *inode = file_inode(file);
433 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
434 struct ceph_file_info *fi = file->private_data;
435 struct ceph_rw_context *rw_ctx;
439 if (ceph_inode(inode)->i_inline_version != CEPH_INLINE_NONE)
442 rc = ceph_readpages_from_fscache(mapping->host, mapping, page_list,
448 rw_ctx = ceph_find_rw_context(fi);
449 max = fsc->mount_options->rsize >> PAGE_SHIFT;
450 dout("readpages %p file %p ctx %p nr_pages %d max %d\n",
451 inode, file, rw_ctx, nr_pages, max);
452 while (!list_empty(page_list)) {
453 rc = start_read(inode, rw_ctx, page_list, max);
458 ceph_fscache_readpages_cancel(inode, page_list);
460 dout("readpages %p file %p ret %d\n", inode, file, rc);
464 struct ceph_writeback_ctl
474 * Get ref for the oldest snapc for an inode with dirty data... that is, the
475 * only snap context we are allowed to write back.
477 static struct ceph_snap_context *
478 get_oldest_context(struct inode *inode, struct ceph_writeback_ctl *ctl,
479 struct ceph_snap_context *page_snapc)
481 struct ceph_inode_info *ci = ceph_inode(inode);
482 struct ceph_snap_context *snapc = NULL;
483 struct ceph_cap_snap *capsnap = NULL;
485 spin_lock(&ci->i_ceph_lock);
486 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
487 dout(" cap_snap %p snapc %p has %d dirty pages\n", capsnap,
488 capsnap->context, capsnap->dirty_pages);
489 if (!capsnap->dirty_pages)
492 /* get i_size, truncate_{seq,size} for page_snapc? */
493 if (snapc && capsnap->context != page_snapc)
497 if (capsnap->writing) {
498 ctl->i_size = i_size_read(inode);
499 ctl->size_stable = false;
501 ctl->i_size = capsnap->size;
502 ctl->size_stable = true;
504 ctl->truncate_size = capsnap->truncate_size;
505 ctl->truncate_seq = capsnap->truncate_seq;
506 ctl->head_snapc = false;
512 snapc = ceph_get_snap_context(capsnap->context);
514 page_snapc == snapc ||
515 page_snapc->seq > snapc->seq)
518 if (!snapc && ci->i_wrbuffer_ref_head) {
519 snapc = ceph_get_snap_context(ci->i_head_snapc);
520 dout(" head snapc %p has %d dirty pages\n",
521 snapc, ci->i_wrbuffer_ref_head);
523 ctl->i_size = i_size_read(inode);
524 ctl->truncate_size = ci->i_truncate_size;
525 ctl->truncate_seq = ci->i_truncate_seq;
526 ctl->size_stable = false;
527 ctl->head_snapc = true;
530 spin_unlock(&ci->i_ceph_lock);
534 static u64 get_writepages_data_length(struct inode *inode,
535 struct page *page, u64 start)
537 struct ceph_inode_info *ci = ceph_inode(inode);
538 struct ceph_snap_context *snapc = page_snap_context(page);
539 struct ceph_cap_snap *capsnap = NULL;
540 u64 end = i_size_read(inode);
542 if (snapc != ci->i_head_snapc) {
544 spin_lock(&ci->i_ceph_lock);
545 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
546 if (capsnap->context == snapc) {
547 if (!capsnap->writing)
553 spin_unlock(&ci->i_ceph_lock);
556 if (end > page_offset(page) + PAGE_SIZE)
557 end = page_offset(page) + PAGE_SIZE;
558 return end > start ? end - start : 0;
562 * Write a single page, but leave the page locked.
564 * If we get a write error, set the page error bit, but still adjust the
565 * dirty page accounting (i.e., page is no longer dirty).
567 static int writepage_nounlock(struct page *page, struct writeback_control *wbc)
570 struct ceph_inode_info *ci;
571 struct ceph_fs_client *fsc;
572 struct ceph_snap_context *snapc, *oldest;
573 loff_t page_off = page_offset(page);
574 int err, len = PAGE_SIZE;
575 struct ceph_writeback_ctl ceph_wbc;
577 dout("writepage %p idx %lu\n", page, page->index);
579 inode = page->mapping->host;
580 ci = ceph_inode(inode);
581 fsc = ceph_inode_to_client(inode);
583 /* verify this is a writeable snap context */
584 snapc = page_snap_context(page);
586 dout("writepage %p page %p not dirty?\n", inode, page);
589 oldest = get_oldest_context(inode, &ceph_wbc, snapc);
590 if (snapc->seq > oldest->seq) {
591 dout("writepage %p page %p snapc %p not writeable - noop\n",
593 /* we should only noop if called by kswapd */
594 WARN_ON(!(current->flags & PF_MEMALLOC));
595 ceph_put_snap_context(oldest);
596 redirty_page_for_writepage(wbc, page);
599 ceph_put_snap_context(oldest);
601 /* is this a partial page at end of file? */
602 if (page_off >= ceph_wbc.i_size) {
603 dout("%p page eof %llu\n", page, ceph_wbc.i_size);
604 page->mapping->a_ops->invalidatepage(page, 0, PAGE_SIZE);
608 if (ceph_wbc.i_size < page_off + len)
609 len = ceph_wbc.i_size - page_off;
611 dout("writepage %p page %p index %lu on %llu~%u snapc %p seq %lld\n",
612 inode, page, page->index, page_off, len, snapc, snapc->seq);
614 if (atomic_long_inc_return(&fsc->writeback_count) >
615 CONGESTION_ON_THRESH(fsc->mount_options->congestion_kb))
616 set_bdi_congested(inode_to_bdi(inode), BLK_RW_ASYNC);
618 set_page_writeback(page);
619 err = ceph_osdc_writepages(&fsc->client->osdc, ceph_vino(inode),
620 &ci->i_layout, snapc, page_off, len,
621 ceph_wbc.truncate_seq,
622 ceph_wbc.truncate_size,
623 &inode->i_mtime, &page, 1);
625 struct writeback_control tmp_wbc;
628 if (err == -ERESTARTSYS) {
629 /* killed by SIGKILL */
630 dout("writepage interrupted page %p\n", page);
631 redirty_page_for_writepage(wbc, page);
632 end_page_writeback(page);
635 dout("writepage setting page/mapping error %d %p\n",
638 mapping_set_error(&inode->i_data, err);
639 wbc->pages_skipped++;
641 dout("writepage cleaned page %p\n", page);
642 err = 0; /* vfs expects us to return 0 */
645 ClearPagePrivate(page);
646 end_page_writeback(page);
647 ceph_put_wrbuffer_cap_refs(ci, 1, snapc);
648 ceph_put_snap_context(snapc); /* page's reference */
650 if (atomic_long_dec_return(&fsc->writeback_count) <
651 CONGESTION_OFF_THRESH(fsc->mount_options->congestion_kb))
652 clear_bdi_congested(inode_to_bdi(inode), BLK_RW_ASYNC);
657 static int ceph_writepage(struct page *page, struct writeback_control *wbc)
660 struct inode *inode = page->mapping->host;
663 err = writepage_nounlock(page, wbc);
664 if (err == -ERESTARTSYS) {
665 /* direct memory reclaimer was killed by SIGKILL. return 0
666 * to prevent caller from setting mapping/page error */
675 * lame release_pages helper. release_pages() isn't exported to
678 static void ceph_release_pages(struct page **pages, int num)
684 for (i = 0; i < num; i++) {
685 if (pagevec_add(&pvec, pages[i]) == 0)
686 pagevec_release(&pvec);
688 pagevec_release(&pvec);
692 * async writeback completion handler.
694 * If we get an error, set the mapping error bit, but not the individual
697 static void writepages_finish(struct ceph_osd_request *req)
699 struct inode *inode = req->r_inode;
700 struct ceph_inode_info *ci = ceph_inode(inode);
701 struct ceph_osd_data *osd_data;
703 int num_pages, total_pages = 0;
705 int rc = req->r_result;
706 struct ceph_snap_context *snapc = req->r_snapc;
707 struct address_space *mapping = inode->i_mapping;
708 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
711 dout("writepages_finish %p rc %d\n", inode, rc);
713 mapping_set_error(mapping, rc);
714 ceph_set_error_write(ci);
716 ceph_clear_error_write(ci);
720 * We lost the cache cap, need to truncate the page before
721 * it is unlocked, otherwise we'd truncate it later in the
722 * page truncation thread, possibly losing some data that
725 remove_page = !(ceph_caps_issued(ci) &
726 (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO));
728 /* clean all pages */
729 for (i = 0; i < req->r_num_ops; i++) {
730 if (req->r_ops[i].op != CEPH_OSD_OP_WRITE)
733 osd_data = osd_req_op_extent_osd_data(req, i);
734 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES);
735 num_pages = calc_pages_for((u64)osd_data->alignment,
736 (u64)osd_data->length);
737 total_pages += num_pages;
738 for (j = 0; j < num_pages; j++) {
739 page = osd_data->pages[j];
741 WARN_ON(!PageUptodate(page));
743 if (atomic_long_dec_return(&fsc->writeback_count) <
744 CONGESTION_OFF_THRESH(
745 fsc->mount_options->congestion_kb))
746 clear_bdi_congested(inode_to_bdi(inode),
749 ceph_put_snap_context(page_snap_context(page));
751 ClearPagePrivate(page);
752 dout("unlocking %p\n", page);
753 end_page_writeback(page);
756 generic_error_remove_page(inode->i_mapping,
761 dout("writepages_finish %p wrote %llu bytes cleaned %d pages\n",
762 inode, osd_data->length, rc >= 0 ? num_pages : 0);
764 ceph_release_pages(osd_data->pages, num_pages);
767 ceph_put_wrbuffer_cap_refs(ci, total_pages, snapc);
769 osd_data = osd_req_op_extent_osd_data(req, 0);
770 if (osd_data->pages_from_pool)
771 mempool_free(osd_data->pages,
772 ceph_sb_to_client(inode->i_sb)->wb_pagevec_pool);
774 kfree(osd_data->pages);
775 ceph_osdc_put_request(req);
779 * initiate async writeback
781 static int ceph_writepages_start(struct address_space *mapping,
782 struct writeback_control *wbc)
784 struct inode *inode = mapping->host;
785 struct ceph_inode_info *ci = ceph_inode(inode);
786 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
787 struct ceph_vino vino = ceph_vino(inode);
788 pgoff_t index, start_index, end = -1;
789 struct ceph_snap_context *snapc = NULL, *last_snapc = NULL, *pgsnapc;
792 unsigned int wsize = i_blocksize(inode);
793 struct ceph_osd_request *req = NULL;
794 struct ceph_writeback_ctl ceph_wbc;
795 bool should_loop, range_whole = false;
798 dout("writepages_start %p (mode=%s)\n", inode,
799 wbc->sync_mode == WB_SYNC_NONE ? "NONE" :
800 (wbc->sync_mode == WB_SYNC_ALL ? "ALL" : "HOLD"));
802 if (READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
803 if (ci->i_wrbuffer_ref > 0) {
805 "writepage_start %p %lld forced umount\n",
806 inode, ceph_ino(inode));
808 mapping_set_error(mapping, -EIO);
809 return -EIO; /* we're in a forced umount, don't write! */
811 if (fsc->mount_options->wsize < wsize)
812 wsize = fsc->mount_options->wsize;
816 start_index = wbc->range_cyclic ? mapping->writeback_index : 0;
820 /* find oldest snap context with dirty data */
821 snapc = get_oldest_context(inode, &ceph_wbc, NULL);
823 /* hmm, why does writepages get called when there
825 dout(" no snap context with dirty data?\n");
828 dout(" oldest snapc is %p seq %lld (%d snaps)\n",
829 snapc, snapc->seq, snapc->num_snaps);
832 if (ceph_wbc.head_snapc && snapc != last_snapc) {
833 /* where to start/end? */
834 if (wbc->range_cyclic) {
839 dout(" cyclic, start at %lu\n", index);
841 index = wbc->range_start >> PAGE_SHIFT;
842 end = wbc->range_end >> PAGE_SHIFT;
843 if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
845 dout(" not cyclic, %lu to %lu\n", index, end);
847 } else if (!ceph_wbc.head_snapc) {
848 /* Do not respect wbc->range_{start,end}. Dirty pages
849 * in that range can be associated with newer snapc.
850 * They are not writeable until we write all dirty pages
851 * associated with 'snapc' get written */
854 dout(" non-head snapc, range whole\n");
857 ceph_put_snap_context(last_snapc);
860 while (!done && index <= end) {
861 int num_ops = 0, op_idx;
862 unsigned i, pvec_pages, max_pages, locked_pages = 0;
863 struct page **pages = NULL, **data_pages;
864 mempool_t *pool = NULL; /* Becomes non-null if mempool used */
866 pgoff_t strip_unit_end = 0;
867 u64 offset = 0, len = 0;
869 max_pages = wsize >> PAGE_SHIFT;
872 pvec_pages = pagevec_lookup_range_nr_tag(&pvec, mapping, &index,
873 end, PAGECACHE_TAG_DIRTY,
874 max_pages - locked_pages);
875 dout("pagevec_lookup_range_tag got %d\n", pvec_pages);
876 if (!pvec_pages && !locked_pages)
878 for (i = 0; i < pvec_pages && locked_pages < max_pages; i++) {
879 page = pvec.pages[i];
880 dout("? %p idx %lu\n", page, page->index);
881 if (locked_pages == 0)
882 lock_page(page); /* first page */
883 else if (!trylock_page(page))
886 /* only dirty pages, or our accounting breaks */
887 if (unlikely(!PageDirty(page)) ||
888 unlikely(page->mapping != mapping)) {
889 dout("!dirty or !mapping %p\n", page);
893 /* only if matching snap context */
894 pgsnapc = page_snap_context(page);
895 if (pgsnapc != snapc) {
896 dout("page snapc %p %lld != oldest %p %lld\n",
897 pgsnapc, pgsnapc->seq, snapc, snapc->seq);
899 !ceph_wbc.head_snapc &&
900 wbc->sync_mode != WB_SYNC_NONE)
905 if (page_offset(page) >= ceph_wbc.i_size) {
906 dout("%p page eof %llu\n",
907 page, ceph_wbc.i_size);
908 if ((ceph_wbc.size_stable ||
909 page_offset(page) >= i_size_read(inode)) &&
910 clear_page_dirty_for_io(page))
911 mapping->a_ops->invalidatepage(page,
916 if (strip_unit_end && (page->index > strip_unit_end)) {
917 dout("end of strip unit %p\n", page);
921 if (PageWriteback(page)) {
922 if (wbc->sync_mode == WB_SYNC_NONE) {
923 dout("%p under writeback\n", page);
927 dout("waiting on writeback %p\n", page);
928 wait_on_page_writeback(page);
931 if (!clear_page_dirty_for_io(page)) {
932 dout("%p !clear_page_dirty_for_io\n", page);
938 * We have something to write. If this is
939 * the first locked page this time through,
940 * calculate max possinle write size and
941 * allocate a page array
943 if (locked_pages == 0) {
948 /* prepare async write request */
949 offset = (u64)page_offset(page);
950 ceph_calc_file_object_mapping(&ci->i_layout,
957 strip_unit_end = page->index +
958 ((len - 1) >> PAGE_SHIFT);
961 max_pages = calc_pages_for(0, (u64)len);
962 pages = kmalloc_array(max_pages,
966 pool = fsc->wb_pagevec_pool;
967 pages = mempool_alloc(pool, GFP_NOFS);
972 } else if (page->index !=
973 (offset + len) >> PAGE_SHIFT) {
974 if (num_ops >= (pool ? CEPH_OSD_SLAB_OPS :
976 redirty_page_for_writepage(wbc, page);
982 offset = (u64)page_offset(page);
986 /* note position of first page in pvec */
987 dout("%p will write page %p idx %lu\n",
988 inode, page, page->index);
990 if (atomic_long_inc_return(&fsc->writeback_count) >
991 CONGESTION_ON_THRESH(
992 fsc->mount_options->congestion_kb)) {
993 set_bdi_congested(inode_to_bdi(inode),
998 pages[locked_pages++] = page;
999 pvec.pages[i] = NULL;
1004 /* did we get anything? */
1006 goto release_pvec_pages;
1009 /* shift unused page to beginning of pvec */
1010 for (j = 0; j < pvec_pages; j++) {
1014 pvec.pages[n] = pvec.pages[j];
1019 if (pvec_pages && i == pvec_pages &&
1020 locked_pages < max_pages) {
1021 dout("reached end pvec, trying for more\n");
1022 pagevec_release(&pvec);
1023 goto get_more_pages;
1028 offset = page_offset(pages[0]);
1031 req = ceph_osdc_new_request(&fsc->client->osdc,
1032 &ci->i_layout, vino,
1033 offset, &len, 0, num_ops,
1034 CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE,
1035 snapc, ceph_wbc.truncate_seq,
1036 ceph_wbc.truncate_size, false);
1038 req = ceph_osdc_new_request(&fsc->client->osdc,
1039 &ci->i_layout, vino,
1044 CEPH_OSD_FLAG_WRITE,
1045 snapc, ceph_wbc.truncate_seq,
1046 ceph_wbc.truncate_size, true);
1047 BUG_ON(IS_ERR(req));
1049 BUG_ON(len < page_offset(pages[locked_pages - 1]) +
1050 PAGE_SIZE - offset);
1052 req->r_callback = writepages_finish;
1053 req->r_inode = inode;
1055 /* Format the osd request message and submit the write */
1059 for (i = 0; i < locked_pages; i++) {
1060 u64 cur_offset = page_offset(pages[i]);
1061 if (offset + len != cur_offset) {
1062 if (op_idx + 1 == req->r_num_ops)
1064 osd_req_op_extent_dup_last(req, op_idx,
1065 cur_offset - offset);
1066 dout("writepages got pages at %llu~%llu\n",
1068 osd_req_op_extent_osd_data_pages(req, op_idx,
1071 osd_req_op_extent_update(req, op_idx, len);
1074 offset = cur_offset;
1075 data_pages = pages + i;
1079 set_page_writeback(pages[i]);
1083 if (ceph_wbc.size_stable) {
1084 len = min(len, ceph_wbc.i_size - offset);
1085 } else if (i == locked_pages) {
1086 /* writepages_finish() clears writeback pages
1087 * according to the data length, so make sure
1088 * data length covers all locked pages */
1089 u64 min_len = len + 1 - PAGE_SIZE;
1090 len = get_writepages_data_length(inode, pages[i - 1],
1092 len = max(len, min_len);
1094 dout("writepages got pages at %llu~%llu\n", offset, len);
1096 osd_req_op_extent_osd_data_pages(req, op_idx, data_pages, len,
1098 osd_req_op_extent_update(req, op_idx, len);
1100 BUG_ON(op_idx + 1 != req->r_num_ops);
1103 if (i < locked_pages) {
1104 BUG_ON(num_ops <= req->r_num_ops);
1105 num_ops -= req->r_num_ops;
1108 /* allocate new pages array for next request */
1110 pages = kmalloc_array(locked_pages, sizeof(*pages),
1113 pool = fsc->wb_pagevec_pool;
1114 pages = mempool_alloc(pool, GFP_NOFS);
1117 memcpy(pages, data_pages + i,
1118 locked_pages * sizeof(*pages));
1119 memset(data_pages + i, 0,
1120 locked_pages * sizeof(*pages));
1122 BUG_ON(num_ops != req->r_num_ops);
1123 index = pages[i - 1]->index + 1;
1124 /* request message now owns the pages array */
1128 req->r_mtime = inode->i_mtime;
1129 rc = ceph_osdc_start_request(&fsc->client->osdc, req, true);
1133 wbc->nr_to_write -= i;
1138 * We stop writing back only if we are not doing
1139 * integrity sync. In case of integrity sync we have to
1140 * keep going until we have written all the pages
1141 * we tagged for writeback prior to entering this loop.
1143 if (wbc->nr_to_write <= 0 && wbc->sync_mode == WB_SYNC_NONE)
1147 dout("pagevec_release on %d pages (%p)\n", (int)pvec.nr,
1148 pvec.nr ? pvec.pages[0] : NULL);
1149 pagevec_release(&pvec);
1152 if (should_loop && !done) {
1153 /* more to do; loop back to beginning of file */
1154 dout("writepages looping back to beginning of file\n");
1155 end = start_index - 1; /* OK even when start_index == 0 */
1157 /* to write dirty pages associated with next snapc,
1158 * we need to wait until current writes complete */
1159 if (wbc->sync_mode != WB_SYNC_NONE &&
1160 start_index == 0 && /* all dirty pages were checked */
1161 !ceph_wbc.head_snapc) {
1165 while ((index <= end) &&
1166 (nr = pagevec_lookup_tag(&pvec, mapping, &index,
1167 PAGECACHE_TAG_WRITEBACK))) {
1168 for (i = 0; i < nr; i++) {
1169 page = pvec.pages[i];
1170 if (page_snap_context(page) != snapc)
1172 wait_on_page_writeback(page);
1174 pagevec_release(&pvec);
1184 if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
1185 mapping->writeback_index = index;
1188 ceph_osdc_put_request(req);
1189 ceph_put_snap_context(last_snapc);
1190 dout("writepages dend - startone, rc = %d\n", rc);
1197 * See if a given @snapc is either writeable, or already written.
1199 static int context_is_writeable_or_written(struct inode *inode,
1200 struct ceph_snap_context *snapc)
1202 struct ceph_snap_context *oldest = get_oldest_context(inode, NULL, NULL);
1203 int ret = !oldest || snapc->seq <= oldest->seq;
1205 ceph_put_snap_context(oldest);
1210 * We are only allowed to write into/dirty the page if the page is
1211 * clean, or already dirty within the same snap context.
1213 * called with page locked.
1214 * return success with page locked,
1215 * or any failure (incl -EAGAIN) with page unlocked.
1217 static int ceph_update_writeable_page(struct file *file,
1218 loff_t pos, unsigned len,
1221 struct inode *inode = file_inode(file);
1222 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1223 struct ceph_inode_info *ci = ceph_inode(inode);
1224 loff_t page_off = pos & PAGE_MASK;
1225 int pos_in_page = pos & ~PAGE_MASK;
1226 int end_in_page = pos_in_page + len;
1229 struct ceph_snap_context *snapc, *oldest;
1231 if (READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
1232 dout(" page %p forced umount\n", page);
1238 /* writepages currently holds page lock, but if we change that later, */
1239 wait_on_page_writeback(page);
1241 snapc = page_snap_context(page);
1242 if (snapc && snapc != ci->i_head_snapc) {
1244 * this page is already dirty in another (older) snap
1245 * context! is it writeable now?
1247 oldest = get_oldest_context(inode, NULL, NULL);
1248 if (snapc->seq > oldest->seq) {
1249 ceph_put_snap_context(oldest);
1250 dout(" page %p snapc %p not current or oldest\n",
1253 * queue for writeback, and wait for snapc to
1254 * be writeable or written
1256 snapc = ceph_get_snap_context(snapc);
1258 ceph_queue_writeback(inode);
1259 r = wait_event_killable(ci->i_cap_wq,
1260 context_is_writeable_or_written(inode, snapc));
1261 ceph_put_snap_context(snapc);
1262 if (r == -ERESTARTSYS)
1266 ceph_put_snap_context(oldest);
1268 /* yay, writeable, do it now (without dropping page lock) */
1269 dout(" page %p snapc %p not current, but oldest\n",
1271 if (!clear_page_dirty_for_io(page))
1273 r = writepage_nounlock(page, NULL);
1279 if (PageUptodate(page)) {
1280 dout(" page %p already uptodate\n", page);
1285 if (pos_in_page == 0 && len == PAGE_SIZE)
1288 /* past end of file? */
1289 i_size = i_size_read(inode);
1291 if (page_off >= i_size ||
1292 (pos_in_page == 0 && (pos+len) >= i_size &&
1293 end_in_page - pos_in_page != PAGE_SIZE)) {
1294 dout(" zeroing %p 0 - %d and %d - %d\n",
1295 page, pos_in_page, end_in_page, (int)PAGE_SIZE);
1296 zero_user_segments(page,
1298 end_in_page, PAGE_SIZE);
1302 /* we need to read it. */
1303 r = ceph_do_readpage(file, page);
1305 if (r == -EINPROGRESS)
1316 * We are only allowed to write into/dirty the page if the page is
1317 * clean, or already dirty within the same snap context.
1319 static int ceph_write_begin(struct file *file, struct address_space *mapping,
1320 loff_t pos, unsigned len, unsigned flags,
1321 struct page **pagep, void **fsdata)
1323 struct inode *inode = file_inode(file);
1325 pgoff_t index = pos >> PAGE_SHIFT;
1330 page = grab_cache_page_write_begin(mapping, index, 0);
1334 dout("write_begin file %p inode %p page %p %d~%d\n", file,
1335 inode, page, (int)pos, (int)len);
1337 r = ceph_update_writeable_page(file, pos, len, page);
1342 } while (r == -EAGAIN);
1348 * we don't do anything in here that simple_write_end doesn't do
1349 * except adjust dirty page accounting
1351 static int ceph_write_end(struct file *file, struct address_space *mapping,
1352 loff_t pos, unsigned len, unsigned copied,
1353 struct page *page, void *fsdata)
1355 struct inode *inode = file_inode(file);
1356 bool check_cap = false;
1358 dout("write_end file %p inode %p page %p %d~%d (%d)\n", file,
1359 inode, page, (int)pos, (int)copied, (int)len);
1361 /* zero the stale part of the page if we did a short copy */
1362 if (!PageUptodate(page)) {
1367 SetPageUptodate(page);
1370 /* did file size increase? */
1371 if (pos+copied > i_size_read(inode))
1372 check_cap = ceph_inode_set_size(inode, pos+copied);
1374 set_page_dirty(page);
1381 ceph_check_caps(ceph_inode(inode), CHECK_CAPS_AUTHONLY, NULL);
1387 * we set .direct_IO to indicate direct io is supported, but since we
1388 * intercept O_DIRECT reads and writes early, this function should
1391 static ssize_t ceph_direct_io(struct kiocb *iocb, struct iov_iter *iter)
1397 const struct address_space_operations ceph_aops = {
1398 .readpage = ceph_readpage,
1399 .readpages = ceph_readpages,
1400 .writepage = ceph_writepage,
1401 .writepages = ceph_writepages_start,
1402 .write_begin = ceph_write_begin,
1403 .write_end = ceph_write_end,
1404 .set_page_dirty = ceph_set_page_dirty,
1405 .invalidatepage = ceph_invalidatepage,
1406 .releasepage = ceph_releasepage,
1407 .direct_IO = ceph_direct_io,
1410 static void ceph_block_sigs(sigset_t *oldset)
1413 siginitsetinv(&mask, sigmask(SIGKILL));
1414 sigprocmask(SIG_BLOCK, &mask, oldset);
1417 static void ceph_restore_sigs(sigset_t *oldset)
1419 sigprocmask(SIG_SETMASK, oldset, NULL);
1425 static vm_fault_t ceph_filemap_fault(struct vm_fault *vmf)
1427 struct vm_area_struct *vma = vmf->vma;
1428 struct inode *inode = file_inode(vma->vm_file);
1429 struct ceph_inode_info *ci = ceph_inode(inode);
1430 struct ceph_file_info *fi = vma->vm_file->private_data;
1431 struct page *pinned_page = NULL;
1432 loff_t off = (loff_t)vmf->pgoff << PAGE_SHIFT;
1435 vm_fault_t ret = VM_FAULT_SIGBUS;
1437 ceph_block_sigs(&oldset);
1439 dout("filemap_fault %p %llx.%llx %llu~%zd trying to get caps\n",
1440 inode, ceph_vinop(inode), off, (size_t)PAGE_SIZE);
1441 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1442 want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
1444 want = CEPH_CAP_FILE_CACHE;
1447 err = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, -1, &got, &pinned_page);
1451 dout("filemap_fault %p %llu~%zd got cap refs on %s\n",
1452 inode, off, (size_t)PAGE_SIZE, ceph_cap_string(got));
1454 if ((got & (CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO)) ||
1455 ci->i_inline_version == CEPH_INLINE_NONE) {
1456 CEPH_DEFINE_RW_CONTEXT(rw_ctx, got);
1457 ceph_add_rw_context(fi, &rw_ctx);
1458 ret = filemap_fault(vmf);
1459 ceph_del_rw_context(fi, &rw_ctx);
1460 dout("filemap_fault %p %llu~%zd drop cap refs %s ret %x\n",
1461 inode, off, (size_t)PAGE_SIZE,
1462 ceph_cap_string(got), ret);
1467 put_page(pinned_page);
1468 ceph_put_cap_refs(ci, got);
1473 /* read inline data */
1474 if (off >= PAGE_SIZE) {
1475 /* does not support inline data > PAGE_SIZE */
1476 ret = VM_FAULT_SIGBUS;
1478 struct address_space *mapping = inode->i_mapping;
1479 struct page *page = find_or_create_page(mapping, 0,
1480 mapping_gfp_constraint(mapping,
1486 err = __ceph_do_getattr(inode, page,
1487 CEPH_STAT_CAP_INLINE_DATA, true);
1488 if (err < 0 || off >= i_size_read(inode)) {
1494 ret = VM_FAULT_SIGBUS;
1497 if (err < PAGE_SIZE)
1498 zero_user_segment(page, err, PAGE_SIZE);
1500 flush_dcache_page(page);
1501 SetPageUptodate(page);
1503 ret = VM_FAULT_MAJOR | VM_FAULT_LOCKED;
1505 dout("filemap_fault %p %llu~%zd read inline data ret %x\n",
1506 inode, off, (size_t)PAGE_SIZE, ret);
1509 ceph_restore_sigs(&oldset);
1511 ret = vmf_error(err);
1517 * Reuse write_begin here for simplicity.
1519 static vm_fault_t ceph_page_mkwrite(struct vm_fault *vmf)
1521 struct vm_area_struct *vma = vmf->vma;
1522 struct inode *inode = file_inode(vma->vm_file);
1523 struct ceph_inode_info *ci = ceph_inode(inode);
1524 struct ceph_file_info *fi = vma->vm_file->private_data;
1525 struct ceph_cap_flush *prealloc_cf;
1526 struct page *page = vmf->page;
1527 loff_t off = page_offset(page);
1528 loff_t size = i_size_read(inode);
1532 vm_fault_t ret = VM_FAULT_SIGBUS;
1534 prealloc_cf = ceph_alloc_cap_flush();
1536 return VM_FAULT_OOM;
1538 ceph_block_sigs(&oldset);
1540 if (ci->i_inline_version != CEPH_INLINE_NONE) {
1541 struct page *locked_page = NULL;
1546 err = ceph_uninline_data(vma->vm_file, locked_page);
1548 unlock_page(locked_page);
1553 if (off + PAGE_SIZE <= size)
1556 len = size & ~PAGE_MASK;
1558 dout("page_mkwrite %p %llx.%llx %llu~%zd getting caps i_size %llu\n",
1559 inode, ceph_vinop(inode), off, len, size);
1560 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1561 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
1563 want = CEPH_CAP_FILE_BUFFER;
1566 err = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, off + len,
1571 dout("page_mkwrite %p %llu~%zd got cap refs on %s\n",
1572 inode, off, len, ceph_cap_string(got));
1574 /* Update time before taking page lock */
1575 file_update_time(vma->vm_file);
1580 if ((off > size) || (page->mapping != inode->i_mapping)) {
1582 ret = VM_FAULT_NOPAGE;
1586 err = ceph_update_writeable_page(vma->vm_file, off, len, page);
1588 /* success. we'll keep the page locked. */
1589 set_page_dirty(page);
1590 ret = VM_FAULT_LOCKED;
1592 } while (err == -EAGAIN);
1594 if (ret == VM_FAULT_LOCKED ||
1595 ci->i_inline_version != CEPH_INLINE_NONE) {
1597 spin_lock(&ci->i_ceph_lock);
1598 ci->i_inline_version = CEPH_INLINE_NONE;
1599 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
1601 spin_unlock(&ci->i_ceph_lock);
1603 __mark_inode_dirty(inode, dirty);
1606 dout("page_mkwrite %p %llu~%zd dropping cap refs on %s ret %x\n",
1607 inode, off, len, ceph_cap_string(got), ret);
1608 ceph_put_cap_refs(ci, got);
1610 ceph_restore_sigs(&oldset);
1611 ceph_free_cap_flush(prealloc_cf);
1613 ret = vmf_error(err);
1617 void ceph_fill_inline_data(struct inode *inode, struct page *locked_page,
1618 char *data, size_t len)
1620 struct address_space *mapping = inode->i_mapping;
1626 if (i_size_read(inode) == 0)
1628 page = find_or_create_page(mapping, 0,
1629 mapping_gfp_constraint(mapping,
1633 if (PageUptodate(page)) {
1640 dout("fill_inline_data %p %llx.%llx len %zu locked_page %p\n",
1641 inode, ceph_vinop(inode), len, locked_page);
1644 void *kaddr = kmap_atomic(page);
1645 memcpy(kaddr, data, len);
1646 kunmap_atomic(kaddr);
1649 if (page != locked_page) {
1650 if (len < PAGE_SIZE)
1651 zero_user_segment(page, len, PAGE_SIZE);
1653 flush_dcache_page(page);
1655 SetPageUptodate(page);
1661 int ceph_uninline_data(struct file *filp, struct page *locked_page)
1663 struct inode *inode = file_inode(filp);
1664 struct ceph_inode_info *ci = ceph_inode(inode);
1665 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1666 struct ceph_osd_request *req;
1667 struct page *page = NULL;
1668 u64 len, inline_version;
1670 bool from_pagecache = false;
1672 spin_lock(&ci->i_ceph_lock);
1673 inline_version = ci->i_inline_version;
1674 spin_unlock(&ci->i_ceph_lock);
1676 dout("uninline_data %p %llx.%llx inline_version %llu\n",
1677 inode, ceph_vinop(inode), inline_version);
1679 if (inline_version == 1 || /* initial version, no data */
1680 inline_version == CEPH_INLINE_NONE)
1685 WARN_ON(!PageUptodate(page));
1686 } else if (ceph_caps_issued(ci) &
1687 (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) {
1688 page = find_get_page(inode->i_mapping, 0);
1690 if (PageUptodate(page)) {
1691 from_pagecache = true;
1701 len = i_size_read(inode);
1702 if (len > PAGE_SIZE)
1705 page = __page_cache_alloc(GFP_NOFS);
1710 err = __ceph_do_getattr(inode, page,
1711 CEPH_STAT_CAP_INLINE_DATA, true);
1713 /* no inline data */
1714 if (err == -ENODATA)
1721 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1722 ceph_vino(inode), 0, &len, 0, 1,
1723 CEPH_OSD_OP_CREATE, CEPH_OSD_FLAG_WRITE,
1730 req->r_mtime = inode->i_mtime;
1731 err = ceph_osdc_start_request(&fsc->client->osdc, req, false);
1733 err = ceph_osdc_wait_request(&fsc->client->osdc, req);
1734 ceph_osdc_put_request(req);
1738 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1739 ceph_vino(inode), 0, &len, 1, 3,
1740 CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE,
1741 NULL, ci->i_truncate_seq,
1742 ci->i_truncate_size, false);
1748 osd_req_op_extent_osd_data_pages(req, 1, &page, len, 0, false, false);
1751 __le64 xattr_buf = cpu_to_le64(inline_version);
1752 err = osd_req_op_xattr_init(req, 0, CEPH_OSD_OP_CMPXATTR,
1753 "inline_version", &xattr_buf,
1755 CEPH_OSD_CMPXATTR_OP_GT,
1756 CEPH_OSD_CMPXATTR_MODE_U64);
1763 int xattr_len = snprintf(xattr_buf, sizeof(xattr_buf),
1764 "%llu", inline_version);
1765 err = osd_req_op_xattr_init(req, 2, CEPH_OSD_OP_SETXATTR,
1767 xattr_buf, xattr_len, 0, 0);
1772 req->r_mtime = inode->i_mtime;
1773 err = ceph_osdc_start_request(&fsc->client->osdc, req, false);
1775 err = ceph_osdc_wait_request(&fsc->client->osdc, req);
1777 ceph_osdc_put_request(req);
1778 if (err == -ECANCELED)
1781 if (page && page != locked_page) {
1782 if (from_pagecache) {
1786 __free_pages(page, 0);
1789 dout("uninline_data %p %llx.%llx inline_version %llu = %d\n",
1790 inode, ceph_vinop(inode), inline_version, err);
1794 static const struct vm_operations_struct ceph_vmops = {
1795 .fault = ceph_filemap_fault,
1796 .page_mkwrite = ceph_page_mkwrite,
1799 int ceph_mmap(struct file *file, struct vm_area_struct *vma)
1801 struct address_space *mapping = file->f_mapping;
1803 if (!mapping->a_ops->readpage)
1805 file_accessed(file);
1806 vma->vm_ops = &ceph_vmops;
1815 static int __ceph_pool_perm_get(struct ceph_inode_info *ci,
1816 s64 pool, struct ceph_string *pool_ns)
1818 struct ceph_fs_client *fsc = ceph_inode_to_client(&ci->vfs_inode);
1819 struct ceph_mds_client *mdsc = fsc->mdsc;
1820 struct ceph_osd_request *rd_req = NULL, *wr_req = NULL;
1821 struct rb_node **p, *parent;
1822 struct ceph_pool_perm *perm;
1823 struct page **pages;
1825 int err = 0, err2 = 0, have = 0;
1827 down_read(&mdsc->pool_perm_rwsem);
1828 p = &mdsc->pool_perm_tree.rb_node;
1830 perm = rb_entry(*p, struct ceph_pool_perm, node);
1831 if (pool < perm->pool)
1833 else if (pool > perm->pool)
1834 p = &(*p)->rb_right;
1836 int ret = ceph_compare_string(pool_ns,
1842 p = &(*p)->rb_right;
1849 up_read(&mdsc->pool_perm_rwsem);
1854 dout("__ceph_pool_perm_get pool %lld ns %.*s no perm cached\n",
1855 pool, (int)pool_ns->len, pool_ns->str);
1857 dout("__ceph_pool_perm_get pool %lld no perm cached\n", pool);
1859 down_write(&mdsc->pool_perm_rwsem);
1860 p = &mdsc->pool_perm_tree.rb_node;
1864 perm = rb_entry(parent, struct ceph_pool_perm, node);
1865 if (pool < perm->pool)
1867 else if (pool > perm->pool)
1868 p = &(*p)->rb_right;
1870 int ret = ceph_compare_string(pool_ns,
1876 p = &(*p)->rb_right;
1884 up_write(&mdsc->pool_perm_rwsem);
1888 rd_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL,
1889 1, false, GFP_NOFS);
1895 rd_req->r_flags = CEPH_OSD_FLAG_READ;
1896 osd_req_op_init(rd_req, 0, CEPH_OSD_OP_STAT, 0);
1897 rd_req->r_base_oloc.pool = pool;
1899 rd_req->r_base_oloc.pool_ns = ceph_get_string(pool_ns);
1900 ceph_oid_printf(&rd_req->r_base_oid, "%llx.00000000", ci->i_vino.ino);
1902 err = ceph_osdc_alloc_messages(rd_req, GFP_NOFS);
1906 wr_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL,
1907 1, false, GFP_NOFS);
1913 wr_req->r_flags = CEPH_OSD_FLAG_WRITE;
1914 osd_req_op_init(wr_req, 0, CEPH_OSD_OP_CREATE, CEPH_OSD_OP_FLAG_EXCL);
1915 ceph_oloc_copy(&wr_req->r_base_oloc, &rd_req->r_base_oloc);
1916 ceph_oid_copy(&wr_req->r_base_oid, &rd_req->r_base_oid);
1918 err = ceph_osdc_alloc_messages(wr_req, GFP_NOFS);
1922 /* one page should be large enough for STAT data */
1923 pages = ceph_alloc_page_vector(1, GFP_KERNEL);
1924 if (IS_ERR(pages)) {
1925 err = PTR_ERR(pages);
1929 osd_req_op_raw_data_in_pages(rd_req, 0, pages, PAGE_SIZE,
1931 err = ceph_osdc_start_request(&fsc->client->osdc, rd_req, false);
1933 wr_req->r_mtime = ci->vfs_inode.i_mtime;
1934 err2 = ceph_osdc_start_request(&fsc->client->osdc, wr_req, false);
1937 err = ceph_osdc_wait_request(&fsc->client->osdc, rd_req);
1939 err2 = ceph_osdc_wait_request(&fsc->client->osdc, wr_req);
1941 if (err >= 0 || err == -ENOENT)
1943 else if (err != -EPERM)
1946 if (err2 == 0 || err2 == -EEXIST)
1948 else if (err2 != -EPERM) {
1953 pool_ns_len = pool_ns ? pool_ns->len : 0;
1954 perm = kmalloc(sizeof(*perm) + pool_ns_len + 1, GFP_NOFS);
1962 perm->pool_ns_len = pool_ns_len;
1963 if (pool_ns_len > 0)
1964 memcpy(perm->pool_ns, pool_ns->str, pool_ns_len);
1965 perm->pool_ns[pool_ns_len] = 0;
1967 rb_link_node(&perm->node, parent, p);
1968 rb_insert_color(&perm->node, &mdsc->pool_perm_tree);
1971 up_write(&mdsc->pool_perm_rwsem);
1973 ceph_osdc_put_request(rd_req);
1974 ceph_osdc_put_request(wr_req);
1979 dout("__ceph_pool_perm_get pool %lld ns %.*s result = %d\n",
1980 pool, (int)pool_ns->len, pool_ns->str, err);
1982 dout("__ceph_pool_perm_get pool %lld result = %d\n", pool, err);
1986 int ceph_pool_perm_check(struct ceph_inode_info *ci, int need)
1989 struct ceph_string *pool_ns;
1992 if (ci->i_vino.snap != CEPH_NOSNAP) {
1994 * Pool permission check needs to write to the first object.
1995 * But for snapshot, head of the first object may have alread
1996 * been deleted. Skip check to avoid creating orphan object.
2001 if (ceph_test_mount_opt(ceph_inode_to_client(&ci->vfs_inode),
2005 spin_lock(&ci->i_ceph_lock);
2006 flags = ci->i_ceph_flags;
2007 pool = ci->i_layout.pool_id;
2008 spin_unlock(&ci->i_ceph_lock);
2010 if (flags & CEPH_I_POOL_PERM) {
2011 if ((need & CEPH_CAP_FILE_RD) && !(flags & CEPH_I_POOL_RD)) {
2012 dout("ceph_pool_perm_check pool %lld no read perm\n",
2016 if ((need & CEPH_CAP_FILE_WR) && !(flags & CEPH_I_POOL_WR)) {
2017 dout("ceph_pool_perm_check pool %lld no write perm\n",
2024 pool_ns = ceph_try_get_string(ci->i_layout.pool_ns);
2025 ret = __ceph_pool_perm_get(ci, pool, pool_ns);
2026 ceph_put_string(pool_ns);
2030 flags = CEPH_I_POOL_PERM;
2031 if (ret & POOL_READ)
2032 flags |= CEPH_I_POOL_RD;
2033 if (ret & POOL_WRITE)
2034 flags |= CEPH_I_POOL_WR;
2036 spin_lock(&ci->i_ceph_lock);
2037 if (pool == ci->i_layout.pool_id &&
2038 pool_ns == rcu_dereference_raw(ci->i_layout.pool_ns)) {
2039 ci->i_ceph_flags |= flags;
2041 pool = ci->i_layout.pool_id;
2042 flags = ci->i_ceph_flags;
2044 spin_unlock(&ci->i_ceph_lock);
2048 void ceph_pool_perm_destroy(struct ceph_mds_client *mdsc)
2050 struct ceph_pool_perm *perm;
2053 while (!RB_EMPTY_ROOT(&mdsc->pool_perm_tree)) {
2054 n = rb_first(&mdsc->pool_perm_tree);
2055 perm = rb_entry(n, struct ceph_pool_perm, node);
2056 rb_erase(n, &mdsc->pool_perm_tree);