1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/ceph/ceph_debug.h>
4 #include <linux/backing-dev.h>
7 #include <linux/swap.h>
8 #include <linux/pagemap.h>
9 #include <linux/slab.h>
10 #include <linux/pagevec.h>
11 #include <linux/task_io_accounting_ops.h>
12 #include <linux/signal.h>
13 #include <linux/iversion.h>
14 #include <linux/ktime.h>
15 #include <linux/netfs.h>
18 #include "mds_client.h"
21 #include <linux/ceph/osd_client.h>
22 #include <linux/ceph/striper.h>
25 * Ceph address space ops.
27 * There are a few funny things going on here.
29 * The page->private field is used to reference a struct
30 * ceph_snap_context for _every_ dirty page. This indicates which
31 * snapshot the page was logically dirtied in, and thus which snap
32 * context needs to be associated with the osd write during writeback.
34 * Similarly, struct ceph_inode_info maintains a set of counters to
35 * count dirty pages on the inode. In the absence of snapshots,
36 * i_wrbuffer_ref == i_wrbuffer_ref_head == the dirty page count.
38 * When a snapshot is taken (that is, when the client receives
39 * notification that a snapshot was taken), each inode with caps and
40 * with dirty pages (dirty pages implies there is a cap) gets a new
41 * ceph_cap_snap in the i_cap_snaps list (which is sorted in ascending
42 * order, new snaps go to the tail). The i_wrbuffer_ref_head count is
43 * moved to capsnap->dirty. (Unless a sync write is currently in
44 * progress. In that case, the capsnap is said to be "pending", new
45 * writes cannot start, and the capsnap isn't "finalized" until the
46 * write completes (or fails) and a final size/mtime for the inode for
47 * that snap can be settled upon.) i_wrbuffer_ref_head is reset to 0.
49 * On writeback, we must submit writes to the osd IN SNAP ORDER. So,
50 * we look for the first capsnap in i_cap_snaps and write out pages in
51 * that snap context _only_. Then we move on to the next capsnap,
52 * eventually reaching the "live" or "head" context (i.e., pages that
53 * are not yet snapped) and are writing the most recently dirtied
56 * Invalidate and so forth must take care to ensure the dirty page
57 * accounting is preserved.
60 #define CONGESTION_ON_THRESH(congestion_kb) (congestion_kb >> (PAGE_SHIFT-10))
61 #define CONGESTION_OFF_THRESH(congestion_kb) \
62 (CONGESTION_ON_THRESH(congestion_kb) - \
63 (CONGESTION_ON_THRESH(congestion_kb) >> 2))
65 static int ceph_netfs_check_write_begin(struct file *file, loff_t pos, unsigned int len,
66 struct folio **foliop, void **_fsdata);
68 static inline struct ceph_snap_context *page_snap_context(struct page *page)
70 if (PagePrivate(page))
71 return (void *)page->private;
76 * Dirty a page. Optimistically adjust accounting, on the assumption
77 * that we won't race with invalidate. If we do, readjust.
79 static bool ceph_dirty_folio(struct address_space *mapping, struct folio *folio)
82 struct ceph_inode_info *ci;
83 struct ceph_snap_context *snapc;
85 if (folio_test_dirty(folio)) {
86 dout("%p dirty_folio %p idx %lu -- already dirty\n",
87 mapping->host, folio, folio->index);
88 VM_BUG_ON_FOLIO(!folio_test_private(folio), folio);
92 inode = mapping->host;
93 ci = ceph_inode(inode);
96 spin_lock(&ci->i_ceph_lock);
97 BUG_ON(ci->i_wr_ref == 0); // caller should hold Fw reference
98 if (__ceph_have_pending_cap_snap(ci)) {
99 struct ceph_cap_snap *capsnap =
100 list_last_entry(&ci->i_cap_snaps,
101 struct ceph_cap_snap,
103 snapc = ceph_get_snap_context(capsnap->context);
104 capsnap->dirty_pages++;
106 BUG_ON(!ci->i_head_snapc);
107 snapc = ceph_get_snap_context(ci->i_head_snapc);
108 ++ci->i_wrbuffer_ref_head;
110 if (ci->i_wrbuffer_ref == 0)
112 ++ci->i_wrbuffer_ref;
113 dout("%p dirty_folio %p idx %lu head %d/%d -> %d/%d "
114 "snapc %p seq %lld (%d snaps)\n",
115 mapping->host, folio, folio->index,
116 ci->i_wrbuffer_ref-1, ci->i_wrbuffer_ref_head-1,
117 ci->i_wrbuffer_ref, ci->i_wrbuffer_ref_head,
118 snapc, snapc->seq, snapc->num_snaps);
119 spin_unlock(&ci->i_ceph_lock);
122 * Reference snap context in folio->private. Also set
123 * PagePrivate so that we get invalidate_folio callback.
125 VM_WARN_ON_FOLIO(folio->private, folio);
126 folio_attach_private(folio, snapc);
128 return ceph_fscache_dirty_folio(mapping, folio);
132 * If we are truncating the full folio (i.e. offset == 0), adjust the
133 * dirty folio counters appropriately. Only called if there is private
136 static void ceph_invalidate_folio(struct folio *folio, size_t offset,
140 struct ceph_inode_info *ci;
141 struct ceph_snap_context *snapc;
143 inode = folio->mapping->host;
144 ci = ceph_inode(inode);
146 if (offset != 0 || length != folio_size(folio)) {
147 dout("%p invalidate_folio idx %lu partial dirty page %zu~%zu\n",
148 inode, folio->index, offset, length);
152 WARN_ON(!folio_test_locked(folio));
153 if (folio_test_private(folio)) {
154 dout("%p invalidate_folio idx %lu full dirty page\n",
155 inode, folio->index);
157 snapc = folio_detach_private(folio);
158 ceph_put_wrbuffer_cap_refs(ci, 1, snapc);
159 ceph_put_snap_context(snapc);
162 folio_wait_fscache(folio);
165 static bool ceph_release_folio(struct folio *folio, gfp_t gfp)
167 struct inode *inode = folio->mapping->host;
169 dout("%llx:%llx release_folio idx %lu (%sdirty)\n",
171 folio->index, folio_test_dirty(folio) ? "" : "not ");
173 if (folio_test_private(folio))
176 if (folio_test_fscache(folio)) {
177 if (current_is_kswapd() || !(gfp & __GFP_FS))
179 folio_wait_fscache(folio);
181 ceph_fscache_note_page_release(inode);
185 static void ceph_netfs_expand_readahead(struct netfs_io_request *rreq)
187 struct inode *inode = rreq->inode;
188 struct ceph_inode_info *ci = ceph_inode(inode);
189 struct ceph_file_layout *lo = &ci->i_layout;
190 unsigned long max_pages = inode->i_sb->s_bdi->ra_pages;
191 loff_t end = rreq->start + rreq->len, new_end;
192 struct ceph_netfs_request_data *priv = rreq->netfs_priv;
193 unsigned long max_len;
197 /* Readahead is disabled by posix_fadvise POSIX_FADV_RANDOM */
198 if (priv->file_ra_disabled)
201 max_pages = priv->file_ra_pages;
205 /* Readahead is disabled */
209 max_len = max_pages << PAGE_SHIFT;
212 * Try to expand the length forward by rounding up it to the next
213 * block, but do not exceed the file size, unless the original
214 * request already exceeds it.
216 new_end = min(round_up(end, lo->stripe_unit), rreq->i_size);
217 if (new_end > end && new_end <= rreq->start + max_len)
218 rreq->len = new_end - rreq->start;
220 /* Try to expand the start downward */
221 div_u64_rem(rreq->start, lo->stripe_unit, &blockoff);
222 if (rreq->len + blockoff <= max_len) {
223 rreq->start -= blockoff;
224 rreq->len += blockoff;
228 static bool ceph_netfs_clamp_length(struct netfs_io_subrequest *subreq)
230 struct inode *inode = subreq->rreq->inode;
231 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
232 struct ceph_inode_info *ci = ceph_inode(inode);
236 /* Truncate the extent at the end of the current block */
237 ceph_calc_file_object_mapping(&ci->i_layout, subreq->start, subreq->len,
238 &objno, &objoff, &xlen);
239 subreq->len = min(xlen, fsc->mount_options->rsize);
243 static void finish_netfs_read(struct ceph_osd_request *req)
245 struct ceph_fs_client *fsc = ceph_inode_to_client(req->r_inode);
246 struct ceph_osd_data *osd_data = osd_req_op_extent_osd_data(req, 0);
247 struct netfs_io_subrequest *subreq = req->r_priv;
248 struct ceph_osd_req_op *op = &req->r_ops[0];
250 int err = req->r_result;
251 bool sparse = (op->op == CEPH_OSD_OP_SPARSE_READ);
253 ceph_update_read_metrics(&fsc->mdsc->metric, req->r_start_latency,
254 req->r_end_latency, osd_data->length, err);
256 dout("%s: result %d subreq->len=%zu i_size=%lld\n", __func__, req->r_result,
257 subreq->len, i_size_read(req->r_inode));
259 /* no object means success but no data */
260 if (sparse && err >= 0)
261 err = ceph_sparse_ext_map_end(op);
262 else if (err == -ENOENT)
264 else if (err == -EBLOCKLISTED)
265 fsc->blocklisted = true;
267 if (err >= 0 && err < subreq->len)
268 __set_bit(NETFS_SREQ_CLEAR_TAIL, &subreq->flags);
270 netfs_subreq_terminated(subreq, err, false);
272 num_pages = calc_pages_for(osd_data->alignment, osd_data->length);
273 ceph_put_page_vector(osd_data->pages, num_pages, false);
277 static bool ceph_netfs_issue_op_inline(struct netfs_io_subrequest *subreq)
279 struct netfs_io_request *rreq = subreq->rreq;
280 struct inode *inode = rreq->inode;
281 struct ceph_mds_reply_info_parsed *rinfo;
282 struct ceph_mds_reply_info_in *iinfo;
283 struct ceph_mds_request *req;
284 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
285 struct ceph_inode_info *ci = ceph_inode(inode);
286 struct iov_iter iter;
291 __set_bit(NETFS_SREQ_CLEAR_TAIL, &subreq->flags);
292 __clear_bit(NETFS_SREQ_COPY_TO_CACHE, &subreq->flags);
294 if (subreq->start >= inode->i_size)
297 /* We need to fetch the inline data. */
298 mode = ceph_try_to_choose_auth_mds(inode, CEPH_STAT_CAP_INLINE_DATA);
299 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, mode);
304 req->r_ino1 = ci->i_vino;
305 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INLINE_DATA);
308 err = ceph_mdsc_do_request(mdsc, NULL, req);
312 rinfo = &req->r_reply_info;
313 iinfo = &rinfo->targeti;
314 if (iinfo->inline_version == CEPH_INLINE_NONE) {
315 /* The data got uninlined */
316 ceph_mdsc_put_request(req);
320 len = min_t(size_t, iinfo->inline_len - subreq->start, subreq->len);
321 iov_iter_xarray(&iter, ITER_DEST, &rreq->mapping->i_pages, subreq->start, len);
322 err = copy_to_iter(iinfo->inline_data + subreq->start, len, &iter);
326 ceph_mdsc_put_request(req);
328 netfs_subreq_terminated(subreq, err, false);
332 static void ceph_netfs_issue_read(struct netfs_io_subrequest *subreq)
334 struct netfs_io_request *rreq = subreq->rreq;
335 struct inode *inode = rreq->inode;
336 struct ceph_inode_info *ci = ceph_inode(inode);
337 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
338 struct ceph_osd_request *req = NULL;
339 struct ceph_vino vino = ceph_vino(inode);
340 struct iov_iter iter;
344 u64 len = subreq->len;
345 bool sparse = ceph_test_mount_opt(fsc, SPARSEREAD);
347 if (ceph_inode_is_shutdown(inode)) {
352 if (ceph_has_inline_data(ci) && ceph_netfs_issue_op_inline(subreq))
355 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, vino, subreq->start, &len,
356 0, 1, sparse ? CEPH_OSD_OP_SPARSE_READ : CEPH_OSD_OP_READ,
357 CEPH_OSD_FLAG_READ | fsc->client->osdc.client->options->read_from_replica,
358 NULL, ci->i_truncate_seq, ci->i_truncate_size, false);
366 err = ceph_alloc_sparse_ext_map(&req->r_ops[0]);
371 dout("%s: pos=%llu orig_len=%zu len=%llu\n", __func__, subreq->start, subreq->len, len);
372 iov_iter_xarray(&iter, ITER_DEST, &rreq->mapping->i_pages, subreq->start, len);
373 err = iov_iter_get_pages_alloc2(&iter, &pages, len, &page_off);
375 dout("%s: iov_ter_get_pages_alloc returned %d\n", __func__, err);
379 /* should always give us a page-aligned read */
380 WARN_ON_ONCE(page_off);
384 osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0, false, false);
385 req->r_callback = finish_netfs_read;
386 req->r_priv = subreq;
387 req->r_inode = inode;
390 ceph_osdc_start_request(req->r_osdc, req);
392 ceph_osdc_put_request(req);
394 netfs_subreq_terminated(subreq, err, false);
395 dout("%s: result %d\n", __func__, err);
398 static int ceph_init_request(struct netfs_io_request *rreq, struct file *file)
400 struct inode *inode = rreq->inode;
401 int got = 0, want = CEPH_CAP_FILE_CACHE;
402 struct ceph_netfs_request_data *priv;
405 if (rreq->origin != NETFS_READAHEAD)
408 priv = kzalloc(sizeof(*priv), GFP_NOFS);
413 struct ceph_rw_context *rw_ctx;
414 struct ceph_file_info *fi = file->private_data;
416 priv->file_ra_pages = file->f_ra.ra_pages;
417 priv->file_ra_disabled = file->f_mode & FMODE_RANDOM;
419 rw_ctx = ceph_find_rw_context(fi);
421 rreq->netfs_priv = priv;
427 * readahead callers do not necessarily hold Fcb caps
428 * (e.g. fadvise, madvise).
430 ret = ceph_try_get_caps(inode, CEPH_CAP_FILE_RD, want, true, &got);
432 dout("start_read %p, error getting cap\n", inode);
437 dout("start_read %p, no cache cap\n", inode);
447 rreq->netfs_priv = priv;
456 static void ceph_netfs_free_request(struct netfs_io_request *rreq)
458 struct ceph_netfs_request_data *priv = rreq->netfs_priv;
464 ceph_put_cap_refs(ceph_inode(rreq->inode), priv->caps);
466 rreq->netfs_priv = NULL;
469 const struct netfs_request_ops ceph_netfs_ops = {
470 .init_request = ceph_init_request,
471 .free_request = ceph_netfs_free_request,
472 .begin_cache_operation = ceph_begin_cache_operation,
473 .issue_read = ceph_netfs_issue_read,
474 .expand_readahead = ceph_netfs_expand_readahead,
475 .clamp_length = ceph_netfs_clamp_length,
476 .check_write_begin = ceph_netfs_check_write_begin,
479 #ifdef CONFIG_CEPH_FSCACHE
480 static void ceph_set_page_fscache(struct page *page)
482 set_page_fscache(page);
485 static void ceph_fscache_write_terminated(void *priv, ssize_t error, bool was_async)
487 struct inode *inode = priv;
489 if (IS_ERR_VALUE(error) && error != -ENOBUFS)
490 ceph_fscache_invalidate(inode, false);
493 static void ceph_fscache_write_to_cache(struct inode *inode, u64 off, u64 len, bool caching)
495 struct ceph_inode_info *ci = ceph_inode(inode);
496 struct fscache_cookie *cookie = ceph_fscache_cookie(ci);
498 fscache_write_to_cache(cookie, inode->i_mapping, off, len, i_size_read(inode),
499 ceph_fscache_write_terminated, inode, caching);
502 static inline void ceph_set_page_fscache(struct page *page)
506 static inline void ceph_fscache_write_to_cache(struct inode *inode, u64 off, u64 len, bool caching)
509 #endif /* CONFIG_CEPH_FSCACHE */
511 struct ceph_writeback_ctl
521 * Get ref for the oldest snapc for an inode with dirty data... that is, the
522 * only snap context we are allowed to write back.
524 static struct ceph_snap_context *
525 get_oldest_context(struct inode *inode, struct ceph_writeback_ctl *ctl,
526 struct ceph_snap_context *page_snapc)
528 struct ceph_inode_info *ci = ceph_inode(inode);
529 struct ceph_snap_context *snapc = NULL;
530 struct ceph_cap_snap *capsnap = NULL;
532 spin_lock(&ci->i_ceph_lock);
533 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
534 dout(" cap_snap %p snapc %p has %d dirty pages\n", capsnap,
535 capsnap->context, capsnap->dirty_pages);
536 if (!capsnap->dirty_pages)
539 /* get i_size, truncate_{seq,size} for page_snapc? */
540 if (snapc && capsnap->context != page_snapc)
544 if (capsnap->writing) {
545 ctl->i_size = i_size_read(inode);
546 ctl->size_stable = false;
548 ctl->i_size = capsnap->size;
549 ctl->size_stable = true;
551 ctl->truncate_size = capsnap->truncate_size;
552 ctl->truncate_seq = capsnap->truncate_seq;
553 ctl->head_snapc = false;
559 snapc = ceph_get_snap_context(capsnap->context);
561 page_snapc == snapc ||
562 page_snapc->seq > snapc->seq)
565 if (!snapc && ci->i_wrbuffer_ref_head) {
566 snapc = ceph_get_snap_context(ci->i_head_snapc);
567 dout(" head snapc %p has %d dirty pages\n",
568 snapc, ci->i_wrbuffer_ref_head);
570 ctl->i_size = i_size_read(inode);
571 ctl->truncate_size = ci->i_truncate_size;
572 ctl->truncate_seq = ci->i_truncate_seq;
573 ctl->size_stable = false;
574 ctl->head_snapc = true;
577 spin_unlock(&ci->i_ceph_lock);
581 static u64 get_writepages_data_length(struct inode *inode,
582 struct page *page, u64 start)
584 struct ceph_inode_info *ci = ceph_inode(inode);
585 struct ceph_snap_context *snapc = page_snap_context(page);
586 struct ceph_cap_snap *capsnap = NULL;
587 u64 end = i_size_read(inode);
589 if (snapc != ci->i_head_snapc) {
591 spin_lock(&ci->i_ceph_lock);
592 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
593 if (capsnap->context == snapc) {
594 if (!capsnap->writing)
600 spin_unlock(&ci->i_ceph_lock);
603 if (end > page_offset(page) + thp_size(page))
604 end = page_offset(page) + thp_size(page);
605 return end > start ? end - start : 0;
609 * Write a single page, but leave the page locked.
611 * If we get a write error, mark the mapping for error, but still adjust the
612 * dirty page accounting (i.e., page is no longer dirty).
614 static int writepage_nounlock(struct page *page, struct writeback_control *wbc)
616 struct folio *folio = page_folio(page);
617 struct inode *inode = page->mapping->host;
618 struct ceph_inode_info *ci = ceph_inode(inode);
619 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
620 struct ceph_snap_context *snapc, *oldest;
621 loff_t page_off = page_offset(page);
623 loff_t len = thp_size(page);
624 struct ceph_writeback_ctl ceph_wbc;
625 struct ceph_osd_client *osdc = &fsc->client->osdc;
626 struct ceph_osd_request *req;
627 bool caching = ceph_is_cache_enabled(inode);
629 dout("writepage %p idx %lu\n", page, page->index);
631 if (ceph_inode_is_shutdown(inode))
634 /* verify this is a writeable snap context */
635 snapc = page_snap_context(page);
637 dout("writepage %p page %p not dirty?\n", inode, page);
640 oldest = get_oldest_context(inode, &ceph_wbc, snapc);
641 if (snapc->seq > oldest->seq) {
642 dout("writepage %p page %p snapc %p not writeable - noop\n",
644 /* we should only noop if called by kswapd */
645 WARN_ON(!(current->flags & PF_MEMALLOC));
646 ceph_put_snap_context(oldest);
647 redirty_page_for_writepage(wbc, page);
650 ceph_put_snap_context(oldest);
652 /* is this a partial page at end of file? */
653 if (page_off >= ceph_wbc.i_size) {
654 dout("folio at %lu beyond eof %llu\n", folio->index,
656 folio_invalidate(folio, 0, folio_size(folio));
660 if (ceph_wbc.i_size < page_off + len)
661 len = ceph_wbc.i_size - page_off;
663 dout("writepage %p page %p index %lu on %llu~%llu snapc %p seq %lld\n",
664 inode, page, page->index, page_off, len, snapc, snapc->seq);
666 if (atomic_long_inc_return(&fsc->writeback_count) >
667 CONGESTION_ON_THRESH(fsc->mount_options->congestion_kb))
668 fsc->write_congested = true;
670 req = ceph_osdc_new_request(osdc, &ci->i_layout, ceph_vino(inode), page_off, &len, 0, 1,
671 CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE, snapc,
672 ceph_wbc.truncate_seq, ceph_wbc.truncate_size,
675 redirty_page_for_writepage(wbc, page);
679 set_page_writeback(page);
681 ceph_set_page_fscache(page);
682 ceph_fscache_write_to_cache(inode, page_off, len, caching);
684 /* it may be a short write due to an object boundary */
685 WARN_ON_ONCE(len > thp_size(page));
686 osd_req_op_extent_osd_data_pages(req, 0, &page, len, 0, false, false);
687 dout("writepage %llu~%llu (%llu bytes)\n", page_off, len, len);
689 req->r_mtime = inode->i_mtime;
690 ceph_osdc_start_request(osdc, req);
691 err = ceph_osdc_wait_request(osdc, req);
693 ceph_update_write_metrics(&fsc->mdsc->metric, req->r_start_latency,
694 req->r_end_latency, len, err);
696 ceph_osdc_put_request(req);
701 struct writeback_control tmp_wbc;
704 if (err == -ERESTARTSYS) {
705 /* killed by SIGKILL */
706 dout("writepage interrupted page %p\n", page);
707 redirty_page_for_writepage(wbc, page);
708 end_page_writeback(page);
711 if (err == -EBLOCKLISTED)
712 fsc->blocklisted = true;
713 dout("writepage setting page/mapping error %d %p\n",
715 mapping_set_error(&inode->i_data, err);
716 wbc->pages_skipped++;
718 dout("writepage cleaned page %p\n", page);
719 err = 0; /* vfs expects us to return 0 */
721 oldest = detach_page_private(page);
722 WARN_ON_ONCE(oldest != snapc);
723 end_page_writeback(page);
724 ceph_put_wrbuffer_cap_refs(ci, 1, snapc);
725 ceph_put_snap_context(snapc); /* page's reference */
727 if (atomic_long_dec_return(&fsc->writeback_count) <
728 CONGESTION_OFF_THRESH(fsc->mount_options->congestion_kb))
729 fsc->write_congested = false;
734 static int ceph_writepage(struct page *page, struct writeback_control *wbc)
737 struct inode *inode = page->mapping->host;
741 if (wbc->sync_mode == WB_SYNC_NONE &&
742 ceph_inode_to_client(inode)->write_congested)
743 return AOP_WRITEPAGE_ACTIVATE;
745 wait_on_page_fscache(page);
747 err = writepage_nounlock(page, wbc);
748 if (err == -ERESTARTSYS) {
749 /* direct memory reclaimer was killed by SIGKILL. return 0
750 * to prevent caller from setting mapping/page error */
759 * async writeback completion handler.
761 * If we get an error, set the mapping error bit, but not the individual
764 static void writepages_finish(struct ceph_osd_request *req)
766 struct inode *inode = req->r_inode;
767 struct ceph_inode_info *ci = ceph_inode(inode);
768 struct ceph_osd_data *osd_data;
770 int num_pages, total_pages = 0;
772 int rc = req->r_result;
773 struct ceph_snap_context *snapc = req->r_snapc;
774 struct address_space *mapping = inode->i_mapping;
775 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
776 unsigned int len = 0;
779 dout("writepages_finish %p rc %d\n", inode, rc);
781 mapping_set_error(mapping, rc);
782 ceph_set_error_write(ci);
783 if (rc == -EBLOCKLISTED)
784 fsc->blocklisted = true;
786 ceph_clear_error_write(ci);
790 * We lost the cache cap, need to truncate the page before
791 * it is unlocked, otherwise we'd truncate it later in the
792 * page truncation thread, possibly losing some data that
795 remove_page = !(ceph_caps_issued(ci) &
796 (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO));
798 /* clean all pages */
799 for (i = 0; i < req->r_num_ops; i++) {
800 if (req->r_ops[i].op != CEPH_OSD_OP_WRITE) {
801 pr_warn("%s incorrect op %d req %p index %d tid %llu\n",
802 __func__, req->r_ops[i].op, req, i, req->r_tid);
806 osd_data = osd_req_op_extent_osd_data(req, i);
807 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES);
808 len += osd_data->length;
809 num_pages = calc_pages_for((u64)osd_data->alignment,
810 (u64)osd_data->length);
811 total_pages += num_pages;
812 for (j = 0; j < num_pages; j++) {
813 page = osd_data->pages[j];
815 WARN_ON(!PageUptodate(page));
817 if (atomic_long_dec_return(&fsc->writeback_count) <
818 CONGESTION_OFF_THRESH(
819 fsc->mount_options->congestion_kb))
820 fsc->write_congested = false;
822 ceph_put_snap_context(detach_page_private(page));
823 end_page_writeback(page);
824 dout("unlocking %p\n", page);
827 generic_error_remove_page(inode->i_mapping,
832 dout("writepages_finish %p wrote %llu bytes cleaned %d pages\n",
833 inode, osd_data->length, rc >= 0 ? num_pages : 0);
835 release_pages(osd_data->pages, num_pages);
838 ceph_update_write_metrics(&fsc->mdsc->metric, req->r_start_latency,
839 req->r_end_latency, len, rc);
841 ceph_put_wrbuffer_cap_refs(ci, total_pages, snapc);
843 osd_data = osd_req_op_extent_osd_data(req, 0);
844 if (osd_data->pages_from_pool)
845 mempool_free(osd_data->pages, ceph_wb_pagevec_pool);
847 kfree(osd_data->pages);
848 ceph_osdc_put_request(req);
852 * initiate async writeback
854 static int ceph_writepages_start(struct address_space *mapping,
855 struct writeback_control *wbc)
857 struct inode *inode = mapping->host;
858 struct ceph_inode_info *ci = ceph_inode(inode);
859 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
860 struct ceph_vino vino = ceph_vino(inode);
861 pgoff_t index, start_index, end = -1;
862 struct ceph_snap_context *snapc = NULL, *last_snapc = NULL, *pgsnapc;
863 struct folio_batch fbatch;
865 unsigned int wsize = i_blocksize(inode);
866 struct ceph_osd_request *req = NULL;
867 struct ceph_writeback_ctl ceph_wbc;
868 bool should_loop, range_whole = false;
870 bool caching = ceph_is_cache_enabled(inode);
873 if (wbc->sync_mode == WB_SYNC_NONE &&
874 fsc->write_congested)
877 dout("writepages_start %p (mode=%s)\n", inode,
878 wbc->sync_mode == WB_SYNC_NONE ? "NONE" :
879 (wbc->sync_mode == WB_SYNC_ALL ? "ALL" : "HOLD"));
881 if (ceph_inode_is_shutdown(inode)) {
882 if (ci->i_wrbuffer_ref > 0) {
884 "writepage_start %p %lld forced umount\n",
885 inode, ceph_ino(inode));
887 mapping_set_error(mapping, -EIO);
888 return -EIO; /* we're in a forced umount, don't write! */
890 if (fsc->mount_options->wsize < wsize)
891 wsize = fsc->mount_options->wsize;
893 folio_batch_init(&fbatch);
895 start_index = wbc->range_cyclic ? mapping->writeback_index : 0;
898 if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages) {
899 tag = PAGECACHE_TAG_TOWRITE;
901 tag = PAGECACHE_TAG_DIRTY;
904 /* find oldest snap context with dirty data */
905 snapc = get_oldest_context(inode, &ceph_wbc, NULL);
907 /* hmm, why does writepages get called when there
909 dout(" no snap context with dirty data?\n");
912 dout(" oldest snapc is %p seq %lld (%d snaps)\n",
913 snapc, snapc->seq, snapc->num_snaps);
916 if (ceph_wbc.head_snapc && snapc != last_snapc) {
917 /* where to start/end? */
918 if (wbc->range_cyclic) {
923 dout(" cyclic, start at %lu\n", index);
925 index = wbc->range_start >> PAGE_SHIFT;
926 end = wbc->range_end >> PAGE_SHIFT;
927 if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
929 dout(" not cyclic, %lu to %lu\n", index, end);
931 } else if (!ceph_wbc.head_snapc) {
932 /* Do not respect wbc->range_{start,end}. Dirty pages
933 * in that range can be associated with newer snapc.
934 * They are not writeable until we write all dirty pages
935 * associated with 'snapc' get written */
938 dout(" non-head snapc, range whole\n");
941 if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages)
942 tag_pages_for_writeback(mapping, index, end);
944 ceph_put_snap_context(last_snapc);
947 while (!done && index <= end) {
948 int num_ops = 0, op_idx;
949 unsigned i, nr_folios, max_pages, locked_pages = 0;
950 struct page **pages = NULL, **data_pages;
952 pgoff_t strip_unit_end = 0;
953 u64 offset = 0, len = 0;
954 bool from_pool = false;
956 max_pages = wsize >> PAGE_SHIFT;
959 nr_folios = filemap_get_folios_tag(mapping, &index,
961 dout("pagevec_lookup_range_tag got %d\n", nr_folios);
962 if (!nr_folios && !locked_pages)
964 for (i = 0; i < nr_folios && locked_pages < max_pages; i++) {
965 page = &fbatch.folios[i]->page;
966 dout("? %p idx %lu\n", page, page->index);
967 if (locked_pages == 0)
968 lock_page(page); /* first page */
969 else if (!trylock_page(page))
972 /* only dirty pages, or our accounting breaks */
973 if (unlikely(!PageDirty(page)) ||
974 unlikely(page->mapping != mapping)) {
975 dout("!dirty or !mapping %p\n", page);
979 /* only if matching snap context */
980 pgsnapc = page_snap_context(page);
981 if (pgsnapc != snapc) {
982 dout("page snapc %p %lld != oldest %p %lld\n",
983 pgsnapc, pgsnapc->seq, snapc, snapc->seq);
985 !ceph_wbc.head_snapc &&
986 wbc->sync_mode != WB_SYNC_NONE)
991 if (page_offset(page) >= ceph_wbc.i_size) {
992 struct folio *folio = page_folio(page);
994 dout("folio at %lu beyond eof %llu\n",
995 folio->index, ceph_wbc.i_size);
996 if ((ceph_wbc.size_stable ||
997 folio_pos(folio) >= i_size_read(inode)) &&
998 folio_clear_dirty_for_io(folio))
999 folio_invalidate(folio, 0,
1001 folio_unlock(folio);
1004 if (strip_unit_end && (page->index > strip_unit_end)) {
1005 dout("end of strip unit %p\n", page);
1009 if (PageWriteback(page) || PageFsCache(page)) {
1010 if (wbc->sync_mode == WB_SYNC_NONE) {
1011 dout("%p under writeback\n", page);
1015 dout("waiting on writeback %p\n", page);
1016 wait_on_page_writeback(page);
1017 wait_on_page_fscache(page);
1020 if (!clear_page_dirty_for_io(page)) {
1021 dout("%p !clear_page_dirty_for_io\n", page);
1027 * We have something to write. If this is
1028 * the first locked page this time through,
1029 * calculate max possinle write size and
1030 * allocate a page array
1032 if (locked_pages == 0) {
1037 /* prepare async write request */
1038 offset = (u64)page_offset(page);
1039 ceph_calc_file_object_mapping(&ci->i_layout,
1046 strip_unit_end = page->index +
1047 ((len - 1) >> PAGE_SHIFT);
1050 max_pages = calc_pages_for(0, (u64)len);
1051 pages = kmalloc_array(max_pages,
1056 pages = mempool_alloc(ceph_wb_pagevec_pool, GFP_NOFS);
1061 } else if (page->index !=
1062 (offset + len) >> PAGE_SHIFT) {
1063 if (num_ops >= (from_pool ? CEPH_OSD_SLAB_OPS :
1064 CEPH_OSD_MAX_OPS)) {
1065 redirty_page_for_writepage(wbc, page);
1071 offset = (u64)page_offset(page);
1075 /* note position of first page in fbatch */
1076 dout("%p will write page %p idx %lu\n",
1077 inode, page, page->index);
1079 if (atomic_long_inc_return(&fsc->writeback_count) >
1080 CONGESTION_ON_THRESH(
1081 fsc->mount_options->congestion_kb))
1082 fsc->write_congested = true;
1084 pages[locked_pages++] = page;
1085 fbatch.folios[i] = NULL;
1087 len += thp_size(page);
1090 /* did we get anything? */
1092 goto release_folios;
1095 /* shift unused page to beginning of fbatch */
1096 for (j = 0; j < nr_folios; j++) {
1097 if (!fbatch.folios[j])
1100 fbatch.folios[n] = fbatch.folios[j];
1105 if (nr_folios && i == nr_folios &&
1106 locked_pages < max_pages) {
1107 dout("reached end fbatch, trying for more\n");
1108 folio_batch_release(&fbatch);
1109 goto get_more_pages;
1114 offset = page_offset(pages[0]);
1117 req = ceph_osdc_new_request(&fsc->client->osdc,
1118 &ci->i_layout, vino,
1119 offset, &len, 0, num_ops,
1120 CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE,
1121 snapc, ceph_wbc.truncate_seq,
1122 ceph_wbc.truncate_size, false);
1124 req = ceph_osdc_new_request(&fsc->client->osdc,
1125 &ci->i_layout, vino,
1130 CEPH_OSD_FLAG_WRITE,
1131 snapc, ceph_wbc.truncate_seq,
1132 ceph_wbc.truncate_size, true);
1133 BUG_ON(IS_ERR(req));
1135 BUG_ON(len < page_offset(pages[locked_pages - 1]) +
1136 thp_size(page) - offset);
1138 req->r_callback = writepages_finish;
1139 req->r_inode = inode;
1141 /* Format the osd request message and submit the write */
1145 for (i = 0; i < locked_pages; i++) {
1146 u64 cur_offset = page_offset(pages[i]);
1148 * Discontinuity in page range? Ceph can handle that by just passing
1149 * multiple extents in the write op.
1151 if (offset + len != cur_offset) {
1152 /* If it's full, stop here */
1153 if (op_idx + 1 == req->r_num_ops)
1156 /* Kick off an fscache write with what we have so far. */
1157 ceph_fscache_write_to_cache(inode, offset, len, caching);
1159 /* Start a new extent */
1160 osd_req_op_extent_dup_last(req, op_idx,
1161 cur_offset - offset);
1162 dout("writepages got pages at %llu~%llu\n",
1164 osd_req_op_extent_osd_data_pages(req, op_idx,
1167 osd_req_op_extent_update(req, op_idx, len);
1170 offset = cur_offset;
1171 data_pages = pages + i;
1175 set_page_writeback(pages[i]);
1177 ceph_set_page_fscache(pages[i]);
1178 len += thp_size(page);
1180 ceph_fscache_write_to_cache(inode, offset, len, caching);
1182 if (ceph_wbc.size_stable) {
1183 len = min(len, ceph_wbc.i_size - offset);
1184 } else if (i == locked_pages) {
1185 /* writepages_finish() clears writeback pages
1186 * according to the data length, so make sure
1187 * data length covers all locked pages */
1188 u64 min_len = len + 1 - thp_size(page);
1189 len = get_writepages_data_length(inode, pages[i - 1],
1191 len = max(len, min_len);
1193 dout("writepages got pages at %llu~%llu\n", offset, len);
1195 osd_req_op_extent_osd_data_pages(req, op_idx, data_pages, len,
1196 0, from_pool, false);
1197 osd_req_op_extent_update(req, op_idx, len);
1199 BUG_ON(op_idx + 1 != req->r_num_ops);
1202 if (i < locked_pages) {
1203 BUG_ON(num_ops <= req->r_num_ops);
1204 num_ops -= req->r_num_ops;
1207 /* allocate new pages array for next request */
1209 pages = kmalloc_array(locked_pages, sizeof(*pages),
1213 pages = mempool_alloc(ceph_wb_pagevec_pool, GFP_NOFS);
1216 memcpy(pages, data_pages + i,
1217 locked_pages * sizeof(*pages));
1218 memset(data_pages + i, 0,
1219 locked_pages * sizeof(*pages));
1221 BUG_ON(num_ops != req->r_num_ops);
1222 index = pages[i - 1]->index + 1;
1223 /* request message now owns the pages array */
1227 req->r_mtime = inode->i_mtime;
1228 ceph_osdc_start_request(&fsc->client->osdc, req);
1231 wbc->nr_to_write -= i;
1236 * We stop writing back only if we are not doing
1237 * integrity sync. In case of integrity sync we have to
1238 * keep going until we have written all the pages
1239 * we tagged for writeback prior to entering this loop.
1241 if (wbc->nr_to_write <= 0 && wbc->sync_mode == WB_SYNC_NONE)
1245 dout("folio_batch release on %d folios (%p)\n", (int)fbatch.nr,
1246 fbatch.nr ? fbatch.folios[0] : NULL);
1247 folio_batch_release(&fbatch);
1250 if (should_loop && !done) {
1251 /* more to do; loop back to beginning of file */
1252 dout("writepages looping back to beginning of file\n");
1253 end = start_index - 1; /* OK even when start_index == 0 */
1255 /* to write dirty pages associated with next snapc,
1256 * we need to wait until current writes complete */
1257 if (wbc->sync_mode != WB_SYNC_NONE &&
1258 start_index == 0 && /* all dirty pages were checked */
1259 !ceph_wbc.head_snapc) {
1263 while ((index <= end) &&
1264 (nr = filemap_get_folios_tag(mapping, &index,
1266 PAGECACHE_TAG_WRITEBACK,
1268 for (i = 0; i < nr; i++) {
1269 page = &fbatch.folios[i]->page;
1270 if (page_snap_context(page) != snapc)
1272 wait_on_page_writeback(page);
1274 folio_batch_release(&fbatch);
1284 if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
1285 mapping->writeback_index = index;
1288 ceph_osdc_put_request(req);
1289 ceph_put_snap_context(last_snapc);
1290 dout("writepages dend - startone, rc = %d\n", rc);
1297 * See if a given @snapc is either writeable, or already written.
1299 static int context_is_writeable_or_written(struct inode *inode,
1300 struct ceph_snap_context *snapc)
1302 struct ceph_snap_context *oldest = get_oldest_context(inode, NULL, NULL);
1303 int ret = !oldest || snapc->seq <= oldest->seq;
1305 ceph_put_snap_context(oldest);
1310 * ceph_find_incompatible - find an incompatible context and return it
1311 * @page: page being dirtied
1313 * We are only allowed to write into/dirty a page if the page is
1314 * clean, or already dirty within the same snap context. Returns a
1315 * conflicting context if there is one, NULL if there isn't, or a
1316 * negative error code on other errors.
1318 * Must be called with page lock held.
1320 static struct ceph_snap_context *
1321 ceph_find_incompatible(struct page *page)
1323 struct inode *inode = page->mapping->host;
1324 struct ceph_inode_info *ci = ceph_inode(inode);
1326 if (ceph_inode_is_shutdown(inode)) {
1327 dout(" page %p %llx:%llx is shutdown\n", page,
1329 return ERR_PTR(-ESTALE);
1333 struct ceph_snap_context *snapc, *oldest;
1335 wait_on_page_writeback(page);
1337 snapc = page_snap_context(page);
1338 if (!snapc || snapc == ci->i_head_snapc)
1342 * this page is already dirty in another (older) snap
1343 * context! is it writeable now?
1345 oldest = get_oldest_context(inode, NULL, NULL);
1346 if (snapc->seq > oldest->seq) {
1347 /* not writeable -- return it for the caller to deal with */
1348 ceph_put_snap_context(oldest);
1349 dout(" page %p snapc %p not current or oldest\n", page, snapc);
1350 return ceph_get_snap_context(snapc);
1352 ceph_put_snap_context(oldest);
1354 /* yay, writeable, do it now (without dropping page lock) */
1355 dout(" page %p snapc %p not current, but oldest\n", page, snapc);
1356 if (clear_page_dirty_for_io(page)) {
1357 int r = writepage_nounlock(page, NULL);
1365 static int ceph_netfs_check_write_begin(struct file *file, loff_t pos, unsigned int len,
1366 struct folio **foliop, void **_fsdata)
1368 struct inode *inode = file_inode(file);
1369 struct ceph_inode_info *ci = ceph_inode(inode);
1370 struct ceph_snap_context *snapc;
1372 snapc = ceph_find_incompatible(folio_page(*foliop, 0));
1376 folio_unlock(*foliop);
1380 return PTR_ERR(snapc);
1382 ceph_queue_writeback(inode);
1383 r = wait_event_killable(ci->i_cap_wq,
1384 context_is_writeable_or_written(inode, snapc));
1385 ceph_put_snap_context(snapc);
1386 return r == 0 ? -EAGAIN : r;
1392 * We are only allowed to write into/dirty the page if the page is
1393 * clean, or already dirty within the same snap context.
1395 static int ceph_write_begin(struct file *file, struct address_space *mapping,
1396 loff_t pos, unsigned len,
1397 struct page **pagep, void **fsdata)
1399 struct inode *inode = file_inode(file);
1400 struct ceph_inode_info *ci = ceph_inode(inode);
1401 struct folio *folio = NULL;
1404 r = netfs_write_begin(&ci->netfs, file, inode->i_mapping, pos, len, &folio, NULL);
1408 folio_wait_fscache(folio);
1409 WARN_ON_ONCE(!folio_test_locked(folio));
1410 *pagep = &folio->page;
1415 * we don't do anything in here that simple_write_end doesn't do
1416 * except adjust dirty page accounting
1418 static int ceph_write_end(struct file *file, struct address_space *mapping,
1419 loff_t pos, unsigned len, unsigned copied,
1420 struct page *subpage, void *fsdata)
1422 struct folio *folio = page_folio(subpage);
1423 struct inode *inode = file_inode(file);
1424 bool check_cap = false;
1426 dout("write_end file %p inode %p folio %p %d~%d (%d)\n", file,
1427 inode, folio, (int)pos, (int)copied, (int)len);
1429 if (!folio_test_uptodate(folio)) {
1430 /* just return that nothing was copied on a short copy */
1435 folio_mark_uptodate(folio);
1438 /* did file size increase? */
1439 if (pos+copied > i_size_read(inode))
1440 check_cap = ceph_inode_set_size(inode, pos+copied);
1442 folio_mark_dirty(folio);
1445 folio_unlock(folio);
1449 ceph_check_caps(ceph_inode(inode), CHECK_CAPS_AUTHONLY);
1454 const struct address_space_operations ceph_aops = {
1455 .read_folio = netfs_read_folio,
1456 .readahead = netfs_readahead,
1457 .writepage = ceph_writepage,
1458 .writepages = ceph_writepages_start,
1459 .write_begin = ceph_write_begin,
1460 .write_end = ceph_write_end,
1461 .dirty_folio = ceph_dirty_folio,
1462 .invalidate_folio = ceph_invalidate_folio,
1463 .release_folio = ceph_release_folio,
1464 .direct_IO = noop_direct_IO,
1467 static void ceph_block_sigs(sigset_t *oldset)
1470 siginitsetinv(&mask, sigmask(SIGKILL));
1471 sigprocmask(SIG_BLOCK, &mask, oldset);
1474 static void ceph_restore_sigs(sigset_t *oldset)
1476 sigprocmask(SIG_SETMASK, oldset, NULL);
1482 static vm_fault_t ceph_filemap_fault(struct vm_fault *vmf)
1484 struct vm_area_struct *vma = vmf->vma;
1485 struct inode *inode = file_inode(vma->vm_file);
1486 struct ceph_inode_info *ci = ceph_inode(inode);
1487 struct ceph_file_info *fi = vma->vm_file->private_data;
1488 loff_t off = (loff_t)vmf->pgoff << PAGE_SHIFT;
1491 vm_fault_t ret = VM_FAULT_SIGBUS;
1493 if (ceph_inode_is_shutdown(inode))
1496 ceph_block_sigs(&oldset);
1498 dout("filemap_fault %p %llx.%llx %llu trying to get caps\n",
1499 inode, ceph_vinop(inode), off);
1500 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1501 want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
1503 want = CEPH_CAP_FILE_CACHE;
1506 err = ceph_get_caps(vma->vm_file, CEPH_CAP_FILE_RD, want, -1, &got);
1510 dout("filemap_fault %p %llu got cap refs on %s\n",
1511 inode, off, ceph_cap_string(got));
1513 if ((got & (CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO)) ||
1514 !ceph_has_inline_data(ci)) {
1515 CEPH_DEFINE_RW_CONTEXT(rw_ctx, got);
1516 ceph_add_rw_context(fi, &rw_ctx);
1517 ret = filemap_fault(vmf);
1518 ceph_del_rw_context(fi, &rw_ctx);
1519 dout("filemap_fault %p %llu drop cap refs %s ret %x\n",
1520 inode, off, ceph_cap_string(got), ret);
1524 ceph_put_cap_refs(ci, got);
1529 /* read inline data */
1530 if (off >= PAGE_SIZE) {
1531 /* does not support inline data > PAGE_SIZE */
1532 ret = VM_FAULT_SIGBUS;
1534 struct address_space *mapping = inode->i_mapping;
1537 filemap_invalidate_lock_shared(mapping);
1538 page = find_or_create_page(mapping, 0,
1539 mapping_gfp_constraint(mapping, ~__GFP_FS));
1544 err = __ceph_do_getattr(inode, page,
1545 CEPH_STAT_CAP_INLINE_DATA, true);
1546 if (err < 0 || off >= i_size_read(inode)) {
1549 ret = vmf_error(err);
1552 if (err < PAGE_SIZE)
1553 zero_user_segment(page, err, PAGE_SIZE);
1555 flush_dcache_page(page);
1556 SetPageUptodate(page);
1558 ret = VM_FAULT_MAJOR | VM_FAULT_LOCKED;
1560 filemap_invalidate_unlock_shared(mapping);
1561 dout("filemap_fault %p %llu read inline data ret %x\n",
1565 ceph_restore_sigs(&oldset);
1567 ret = vmf_error(err);
1572 static vm_fault_t ceph_page_mkwrite(struct vm_fault *vmf)
1574 struct vm_area_struct *vma = vmf->vma;
1575 struct inode *inode = file_inode(vma->vm_file);
1576 struct ceph_inode_info *ci = ceph_inode(inode);
1577 struct ceph_file_info *fi = vma->vm_file->private_data;
1578 struct ceph_cap_flush *prealloc_cf;
1579 struct page *page = vmf->page;
1580 loff_t off = page_offset(page);
1581 loff_t size = i_size_read(inode);
1585 vm_fault_t ret = VM_FAULT_SIGBUS;
1587 if (ceph_inode_is_shutdown(inode))
1590 prealloc_cf = ceph_alloc_cap_flush();
1592 return VM_FAULT_OOM;
1594 sb_start_pagefault(inode->i_sb);
1595 ceph_block_sigs(&oldset);
1597 if (off + thp_size(page) <= size)
1598 len = thp_size(page);
1600 len = offset_in_thp(page, size);
1602 dout("page_mkwrite %p %llx.%llx %llu~%zd getting caps i_size %llu\n",
1603 inode, ceph_vinop(inode), off, len, size);
1604 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1605 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
1607 want = CEPH_CAP_FILE_BUFFER;
1610 err = ceph_get_caps(vma->vm_file, CEPH_CAP_FILE_WR, want, off + len, &got);
1614 dout("page_mkwrite %p %llu~%zd got cap refs on %s\n",
1615 inode, off, len, ceph_cap_string(got));
1617 /* Update time before taking page lock */
1618 file_update_time(vma->vm_file);
1619 inode_inc_iversion_raw(inode);
1622 struct ceph_snap_context *snapc;
1626 if (page_mkwrite_check_truncate(page, inode) < 0) {
1628 ret = VM_FAULT_NOPAGE;
1632 snapc = ceph_find_incompatible(page);
1634 /* success. we'll keep the page locked. */
1635 set_page_dirty(page);
1636 ret = VM_FAULT_LOCKED;
1642 if (IS_ERR(snapc)) {
1643 ret = VM_FAULT_SIGBUS;
1647 ceph_queue_writeback(inode);
1648 err = wait_event_killable(ci->i_cap_wq,
1649 context_is_writeable_or_written(inode, snapc));
1650 ceph_put_snap_context(snapc);
1653 if (ret == VM_FAULT_LOCKED) {
1655 spin_lock(&ci->i_ceph_lock);
1656 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
1658 spin_unlock(&ci->i_ceph_lock);
1660 __mark_inode_dirty(inode, dirty);
1663 dout("page_mkwrite %p %llu~%zd dropping cap refs on %s ret %x\n",
1664 inode, off, len, ceph_cap_string(got), ret);
1665 ceph_put_cap_refs_async(ci, got);
1667 ceph_restore_sigs(&oldset);
1668 sb_end_pagefault(inode->i_sb);
1669 ceph_free_cap_flush(prealloc_cf);
1671 ret = vmf_error(err);
1675 void ceph_fill_inline_data(struct inode *inode, struct page *locked_page,
1676 char *data, size_t len)
1678 struct address_space *mapping = inode->i_mapping;
1684 if (i_size_read(inode) == 0)
1686 page = find_or_create_page(mapping, 0,
1687 mapping_gfp_constraint(mapping,
1691 if (PageUptodate(page)) {
1698 dout("fill_inline_data %p %llx.%llx len %zu locked_page %p\n",
1699 inode, ceph_vinop(inode), len, locked_page);
1702 void *kaddr = kmap_atomic(page);
1703 memcpy(kaddr, data, len);
1704 kunmap_atomic(kaddr);
1707 if (page != locked_page) {
1708 if (len < PAGE_SIZE)
1709 zero_user_segment(page, len, PAGE_SIZE);
1711 flush_dcache_page(page);
1713 SetPageUptodate(page);
1719 int ceph_uninline_data(struct file *file)
1721 struct inode *inode = file_inode(file);
1722 struct ceph_inode_info *ci = ceph_inode(inode);
1723 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1724 struct ceph_osd_request *req = NULL;
1725 struct ceph_cap_flush *prealloc_cf = NULL;
1726 struct folio *folio = NULL;
1727 u64 inline_version = CEPH_INLINE_NONE;
1728 struct page *pages[1];
1732 spin_lock(&ci->i_ceph_lock);
1733 inline_version = ci->i_inline_version;
1734 spin_unlock(&ci->i_ceph_lock);
1736 dout("uninline_data %p %llx.%llx inline_version %llu\n",
1737 inode, ceph_vinop(inode), inline_version);
1739 if (ceph_inode_is_shutdown(inode)) {
1744 if (inline_version == CEPH_INLINE_NONE)
1747 prealloc_cf = ceph_alloc_cap_flush();
1751 if (inline_version == 1) /* initial version, no data */
1754 folio = read_mapping_folio(inode->i_mapping, 0, file);
1755 if (IS_ERR(folio)) {
1756 err = PTR_ERR(folio);
1762 len = i_size_read(inode);
1763 if (len > folio_size(folio))
1764 len = folio_size(folio);
1766 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1767 ceph_vino(inode), 0, &len, 0, 1,
1768 CEPH_OSD_OP_CREATE, CEPH_OSD_FLAG_WRITE,
1775 req->r_mtime = inode->i_mtime;
1776 ceph_osdc_start_request(&fsc->client->osdc, req);
1777 err = ceph_osdc_wait_request(&fsc->client->osdc, req);
1778 ceph_osdc_put_request(req);
1782 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1783 ceph_vino(inode), 0, &len, 1, 3,
1784 CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE,
1785 NULL, ci->i_truncate_seq,
1786 ci->i_truncate_size, false);
1792 pages[0] = folio_page(folio, 0);
1793 osd_req_op_extent_osd_data_pages(req, 1, pages, len, 0, false, false);
1796 __le64 xattr_buf = cpu_to_le64(inline_version);
1797 err = osd_req_op_xattr_init(req, 0, CEPH_OSD_OP_CMPXATTR,
1798 "inline_version", &xattr_buf,
1800 CEPH_OSD_CMPXATTR_OP_GT,
1801 CEPH_OSD_CMPXATTR_MODE_U64);
1808 int xattr_len = snprintf(xattr_buf, sizeof(xattr_buf),
1809 "%llu", inline_version);
1810 err = osd_req_op_xattr_init(req, 2, CEPH_OSD_OP_SETXATTR,
1812 xattr_buf, xattr_len, 0, 0);
1817 req->r_mtime = inode->i_mtime;
1818 ceph_osdc_start_request(&fsc->client->osdc, req);
1819 err = ceph_osdc_wait_request(&fsc->client->osdc, req);
1821 ceph_update_write_metrics(&fsc->mdsc->metric, req->r_start_latency,
1822 req->r_end_latency, len, err);
1828 /* Set to CAP_INLINE_NONE and dirty the caps */
1829 down_read(&fsc->mdsc->snap_rwsem);
1830 spin_lock(&ci->i_ceph_lock);
1831 ci->i_inline_version = CEPH_INLINE_NONE;
1832 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR, &prealloc_cf);
1833 spin_unlock(&ci->i_ceph_lock);
1834 up_read(&fsc->mdsc->snap_rwsem);
1836 __mark_inode_dirty(inode, dirty);
1839 ceph_osdc_put_request(req);
1840 if (err == -ECANCELED)
1844 folio_unlock(folio);
1848 ceph_free_cap_flush(prealloc_cf);
1849 dout("uninline_data %p %llx.%llx inline_version %llu = %d\n",
1850 inode, ceph_vinop(inode), inline_version, err);
1854 static const struct vm_operations_struct ceph_vmops = {
1855 .fault = ceph_filemap_fault,
1856 .page_mkwrite = ceph_page_mkwrite,
1859 int ceph_mmap(struct file *file, struct vm_area_struct *vma)
1861 struct address_space *mapping = file->f_mapping;
1863 if (!mapping->a_ops->read_folio)
1865 vma->vm_ops = &ceph_vmops;
1874 static int __ceph_pool_perm_get(struct ceph_inode_info *ci,
1875 s64 pool, struct ceph_string *pool_ns)
1877 struct ceph_fs_client *fsc = ceph_inode_to_client(&ci->netfs.inode);
1878 struct ceph_mds_client *mdsc = fsc->mdsc;
1879 struct ceph_osd_request *rd_req = NULL, *wr_req = NULL;
1880 struct rb_node **p, *parent;
1881 struct ceph_pool_perm *perm;
1882 struct page **pages;
1884 int err = 0, err2 = 0, have = 0;
1886 down_read(&mdsc->pool_perm_rwsem);
1887 p = &mdsc->pool_perm_tree.rb_node;
1889 perm = rb_entry(*p, struct ceph_pool_perm, node);
1890 if (pool < perm->pool)
1892 else if (pool > perm->pool)
1893 p = &(*p)->rb_right;
1895 int ret = ceph_compare_string(pool_ns,
1901 p = &(*p)->rb_right;
1908 up_read(&mdsc->pool_perm_rwsem);
1913 dout("__ceph_pool_perm_get pool %lld ns %.*s no perm cached\n",
1914 pool, (int)pool_ns->len, pool_ns->str);
1916 dout("__ceph_pool_perm_get pool %lld no perm cached\n", pool);
1918 down_write(&mdsc->pool_perm_rwsem);
1919 p = &mdsc->pool_perm_tree.rb_node;
1923 perm = rb_entry(parent, struct ceph_pool_perm, node);
1924 if (pool < perm->pool)
1926 else if (pool > perm->pool)
1927 p = &(*p)->rb_right;
1929 int ret = ceph_compare_string(pool_ns,
1935 p = &(*p)->rb_right;
1943 up_write(&mdsc->pool_perm_rwsem);
1947 rd_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL,
1948 1, false, GFP_NOFS);
1954 rd_req->r_flags = CEPH_OSD_FLAG_READ;
1955 osd_req_op_init(rd_req, 0, CEPH_OSD_OP_STAT, 0);
1956 rd_req->r_base_oloc.pool = pool;
1958 rd_req->r_base_oloc.pool_ns = ceph_get_string(pool_ns);
1959 ceph_oid_printf(&rd_req->r_base_oid, "%llx.00000000", ci->i_vino.ino);
1961 err = ceph_osdc_alloc_messages(rd_req, GFP_NOFS);
1965 wr_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL,
1966 1, false, GFP_NOFS);
1972 wr_req->r_flags = CEPH_OSD_FLAG_WRITE;
1973 osd_req_op_init(wr_req, 0, CEPH_OSD_OP_CREATE, CEPH_OSD_OP_FLAG_EXCL);
1974 ceph_oloc_copy(&wr_req->r_base_oloc, &rd_req->r_base_oloc);
1975 ceph_oid_copy(&wr_req->r_base_oid, &rd_req->r_base_oid);
1977 err = ceph_osdc_alloc_messages(wr_req, GFP_NOFS);
1981 /* one page should be large enough for STAT data */
1982 pages = ceph_alloc_page_vector(1, GFP_KERNEL);
1983 if (IS_ERR(pages)) {
1984 err = PTR_ERR(pages);
1988 osd_req_op_raw_data_in_pages(rd_req, 0, pages, PAGE_SIZE,
1990 ceph_osdc_start_request(&fsc->client->osdc, rd_req);
1992 wr_req->r_mtime = ci->netfs.inode.i_mtime;
1993 ceph_osdc_start_request(&fsc->client->osdc, wr_req);
1995 err = ceph_osdc_wait_request(&fsc->client->osdc, rd_req);
1996 err2 = ceph_osdc_wait_request(&fsc->client->osdc, wr_req);
1998 if (err >= 0 || err == -ENOENT)
2000 else if (err != -EPERM) {
2001 if (err == -EBLOCKLISTED)
2002 fsc->blocklisted = true;
2006 if (err2 == 0 || err2 == -EEXIST)
2008 else if (err2 != -EPERM) {
2009 if (err2 == -EBLOCKLISTED)
2010 fsc->blocklisted = true;
2015 pool_ns_len = pool_ns ? pool_ns->len : 0;
2016 perm = kmalloc(sizeof(*perm) + pool_ns_len + 1, GFP_NOFS);
2024 perm->pool_ns_len = pool_ns_len;
2025 if (pool_ns_len > 0)
2026 memcpy(perm->pool_ns, pool_ns->str, pool_ns_len);
2027 perm->pool_ns[pool_ns_len] = 0;
2029 rb_link_node(&perm->node, parent, p);
2030 rb_insert_color(&perm->node, &mdsc->pool_perm_tree);
2033 up_write(&mdsc->pool_perm_rwsem);
2035 ceph_osdc_put_request(rd_req);
2036 ceph_osdc_put_request(wr_req);
2041 dout("__ceph_pool_perm_get pool %lld ns %.*s result = %d\n",
2042 pool, (int)pool_ns->len, pool_ns->str, err);
2044 dout("__ceph_pool_perm_get pool %lld result = %d\n", pool, err);
2048 int ceph_pool_perm_check(struct inode *inode, int need)
2050 struct ceph_inode_info *ci = ceph_inode(inode);
2051 struct ceph_string *pool_ns;
2055 /* Only need to do this for regular files */
2056 if (!S_ISREG(inode->i_mode))
2059 if (ci->i_vino.snap != CEPH_NOSNAP) {
2061 * Pool permission check needs to write to the first object.
2062 * But for snapshot, head of the first object may have alread
2063 * been deleted. Skip check to avoid creating orphan object.
2068 if (ceph_test_mount_opt(ceph_inode_to_client(inode),
2072 spin_lock(&ci->i_ceph_lock);
2073 flags = ci->i_ceph_flags;
2074 pool = ci->i_layout.pool_id;
2075 spin_unlock(&ci->i_ceph_lock);
2077 if (flags & CEPH_I_POOL_PERM) {
2078 if ((need & CEPH_CAP_FILE_RD) && !(flags & CEPH_I_POOL_RD)) {
2079 dout("ceph_pool_perm_check pool %lld no read perm\n",
2083 if ((need & CEPH_CAP_FILE_WR) && !(flags & CEPH_I_POOL_WR)) {
2084 dout("ceph_pool_perm_check pool %lld no write perm\n",
2091 pool_ns = ceph_try_get_string(ci->i_layout.pool_ns);
2092 ret = __ceph_pool_perm_get(ci, pool, pool_ns);
2093 ceph_put_string(pool_ns);
2097 flags = CEPH_I_POOL_PERM;
2098 if (ret & POOL_READ)
2099 flags |= CEPH_I_POOL_RD;
2100 if (ret & POOL_WRITE)
2101 flags |= CEPH_I_POOL_WR;
2103 spin_lock(&ci->i_ceph_lock);
2104 if (pool == ci->i_layout.pool_id &&
2105 pool_ns == rcu_dereference_raw(ci->i_layout.pool_ns)) {
2106 ci->i_ceph_flags |= flags;
2108 pool = ci->i_layout.pool_id;
2109 flags = ci->i_ceph_flags;
2111 spin_unlock(&ci->i_ceph_lock);
2115 void ceph_pool_perm_destroy(struct ceph_mds_client *mdsc)
2117 struct ceph_pool_perm *perm;
2120 while (!RB_EMPTY_ROOT(&mdsc->pool_perm_tree)) {
2121 n = rb_first(&mdsc->pool_perm_tree);
2122 perm = rb_entry(n, struct ceph_pool_perm, node);
2123 rb_erase(n, &mdsc->pool_perm_tree);