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"
22 #include <linux/ceph/osd_client.h>
23 #include <linux/ceph/striper.h>
26 * Ceph address space ops.
28 * There are a few funny things going on here.
30 * The page->private field is used to reference a struct
31 * ceph_snap_context for _every_ dirty page. This indicates which
32 * snapshot the page was logically dirtied in, and thus which snap
33 * context needs to be associated with the osd write during writeback.
35 * Similarly, struct ceph_inode_info maintains a set of counters to
36 * count dirty pages on the inode. In the absence of snapshots,
37 * i_wrbuffer_ref == i_wrbuffer_ref_head == the dirty page count.
39 * When a snapshot is taken (that is, when the client receives
40 * notification that a snapshot was taken), each inode with caps and
41 * with dirty pages (dirty pages implies there is a cap) gets a new
42 * ceph_cap_snap in the i_cap_snaps list (which is sorted in ascending
43 * order, new snaps go to the tail). The i_wrbuffer_ref_head count is
44 * moved to capsnap->dirty. (Unless a sync write is currently in
45 * progress. In that case, the capsnap is said to be "pending", new
46 * writes cannot start, and the capsnap isn't "finalized" until the
47 * write completes (or fails) and a final size/mtime for the inode for
48 * that snap can be settled upon.) i_wrbuffer_ref_head is reset to 0.
50 * On writeback, we must submit writes to the osd IN SNAP ORDER. So,
51 * we look for the first capsnap in i_cap_snaps and write out pages in
52 * that snap context _only_. Then we move on to the next capsnap,
53 * eventually reaching the "live" or "head" context (i.e., pages that
54 * are not yet snapped) and are writing the most recently dirtied
57 * Invalidate and so forth must take care to ensure the dirty page
58 * accounting is preserved.
61 #define CONGESTION_ON_THRESH(congestion_kb) (congestion_kb >> (PAGE_SHIFT-10))
62 #define CONGESTION_OFF_THRESH(congestion_kb) \
63 (CONGESTION_ON_THRESH(congestion_kb) - \
64 (CONGESTION_ON_THRESH(congestion_kb) >> 2))
66 static int ceph_netfs_check_write_begin(struct file *file, loff_t pos, unsigned int len,
67 struct folio **foliop, void **_fsdata);
69 static inline struct ceph_snap_context *page_snap_context(struct page *page)
71 if (PagePrivate(page))
72 return (void *)page->private;
77 * Dirty a page. Optimistically adjust accounting, on the assumption
78 * that we won't race with invalidate. If we do, readjust.
80 static bool ceph_dirty_folio(struct address_space *mapping, struct folio *folio)
82 struct inode *inode = mapping->host;
83 struct ceph_client *cl = ceph_inode_to_client(inode);
84 struct ceph_inode_info *ci;
85 struct ceph_snap_context *snapc;
87 if (folio_test_dirty(folio)) {
88 doutc(cl, "%llx.%llx %p idx %lu -- already dirty\n",
89 ceph_vinop(inode), folio, folio->index);
90 VM_BUG_ON_FOLIO(!folio_test_private(folio), folio);
94 ci = ceph_inode(inode);
97 spin_lock(&ci->i_ceph_lock);
98 BUG_ON(ci->i_wr_ref == 0); // caller should hold Fw reference
99 if (__ceph_have_pending_cap_snap(ci)) {
100 struct ceph_cap_snap *capsnap =
101 list_last_entry(&ci->i_cap_snaps,
102 struct ceph_cap_snap,
104 snapc = ceph_get_snap_context(capsnap->context);
105 capsnap->dirty_pages++;
107 BUG_ON(!ci->i_head_snapc);
108 snapc = ceph_get_snap_context(ci->i_head_snapc);
109 ++ci->i_wrbuffer_ref_head;
111 if (ci->i_wrbuffer_ref == 0)
113 ++ci->i_wrbuffer_ref;
114 doutc(cl, "%llx.%llx %p idx %lu head %d/%d -> %d/%d "
115 "snapc %p seq %lld (%d snaps)\n",
116 ceph_vinop(inode), folio, folio->index,
117 ci->i_wrbuffer_ref-1, ci->i_wrbuffer_ref_head-1,
118 ci->i_wrbuffer_ref, ci->i_wrbuffer_ref_head,
119 snapc, snapc->seq, snapc->num_snaps);
120 spin_unlock(&ci->i_ceph_lock);
123 * Reference snap context in folio->private. Also set
124 * PagePrivate so that we get invalidate_folio callback.
126 VM_WARN_ON_FOLIO(folio->private, folio);
127 folio_attach_private(folio, snapc);
129 return ceph_fscache_dirty_folio(mapping, folio);
133 * If we are truncating the full folio (i.e. offset == 0), adjust the
134 * dirty folio counters appropriately. Only called if there is private
137 static void ceph_invalidate_folio(struct folio *folio, size_t offset,
140 struct inode *inode = folio->mapping->host;
141 struct ceph_client *cl = ceph_inode_to_client(inode);
142 struct ceph_inode_info *ci = ceph_inode(inode);
143 struct ceph_snap_context *snapc;
146 if (offset != 0 || length != folio_size(folio)) {
147 doutc(cl, "%llx.%llx idx %lu partial dirty page %zu~%zu\n",
148 ceph_vinop(inode), folio->index, offset, length);
152 WARN_ON(!folio_test_locked(folio));
153 if (folio_test_private(folio)) {
154 doutc(cl, "%llx.%llx idx %lu full dirty page\n",
155 ceph_vinop(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 netfs_invalidate_folio(folio, offset, length);
165 static void ceph_netfs_expand_readahead(struct netfs_io_request *rreq)
167 struct inode *inode = rreq->inode;
168 struct ceph_inode_info *ci = ceph_inode(inode);
169 struct ceph_file_layout *lo = &ci->i_layout;
170 unsigned long max_pages = inode->i_sb->s_bdi->ra_pages;
171 loff_t end = rreq->start + rreq->len, new_end;
172 struct ceph_netfs_request_data *priv = rreq->netfs_priv;
173 unsigned long max_len;
177 /* Readahead is disabled by posix_fadvise POSIX_FADV_RANDOM */
178 if (priv->file_ra_disabled)
181 max_pages = priv->file_ra_pages;
185 /* Readahead is disabled */
189 max_len = max_pages << PAGE_SHIFT;
192 * Try to expand the length forward by rounding up it to the next
193 * block, but do not exceed the file size, unless the original
194 * request already exceeds it.
196 new_end = min(round_up(end, lo->stripe_unit), rreq->i_size);
197 if (new_end > end && new_end <= rreq->start + max_len)
198 rreq->len = new_end - rreq->start;
200 /* Try to expand the start downward */
201 div_u64_rem(rreq->start, lo->stripe_unit, &blockoff);
202 if (rreq->len + blockoff <= max_len) {
203 rreq->start -= blockoff;
204 rreq->len += blockoff;
208 static bool ceph_netfs_clamp_length(struct netfs_io_subrequest *subreq)
210 struct inode *inode = subreq->rreq->inode;
211 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
212 struct ceph_inode_info *ci = ceph_inode(inode);
216 /* Truncate the extent at the end of the current block */
217 ceph_calc_file_object_mapping(&ci->i_layout, subreq->start, subreq->len,
218 &objno, &objoff, &xlen);
219 subreq->len = min(xlen, fsc->mount_options->rsize);
223 static void finish_netfs_read(struct ceph_osd_request *req)
225 struct inode *inode = req->r_inode;
226 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
227 struct ceph_client *cl = fsc->client;
228 struct ceph_osd_data *osd_data = osd_req_op_extent_osd_data(req, 0);
229 struct netfs_io_subrequest *subreq = req->r_priv;
230 struct ceph_osd_req_op *op = &req->r_ops[0];
231 int err = req->r_result;
232 bool sparse = (op->op == CEPH_OSD_OP_SPARSE_READ);
234 ceph_update_read_metrics(&fsc->mdsc->metric, req->r_start_latency,
235 req->r_end_latency, osd_data->length, err);
237 doutc(cl, "result %d subreq->len=%zu i_size=%lld\n", req->r_result,
238 subreq->len, i_size_read(req->r_inode));
240 /* no object means success but no data */
243 else if (err == -EBLOCKLISTED)
244 fsc->blocklisted = true;
247 if (sparse && err > 0)
248 err = ceph_sparse_ext_map_end(op);
249 if (err < subreq->len)
250 __set_bit(NETFS_SREQ_CLEAR_TAIL, &subreq->flags);
251 if (IS_ENCRYPTED(inode) && err > 0) {
252 err = ceph_fscrypt_decrypt_extents(inode,
253 osd_data->pages, subreq->start,
254 op->extent.sparse_ext,
255 op->extent.sparse_ext_cnt);
256 if (err > subreq->len)
261 if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES) {
262 ceph_put_page_vector(osd_data->pages,
263 calc_pages_for(osd_data->alignment,
264 osd_data->length), false);
266 netfs_subreq_terminated(subreq, err, false);
268 ceph_dec_osd_stopping_blocker(fsc->mdsc);
271 static bool ceph_netfs_issue_op_inline(struct netfs_io_subrequest *subreq)
273 struct netfs_io_request *rreq = subreq->rreq;
274 struct inode *inode = rreq->inode;
275 struct ceph_mds_reply_info_parsed *rinfo;
276 struct ceph_mds_reply_info_in *iinfo;
277 struct ceph_mds_request *req;
278 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
279 struct ceph_inode_info *ci = ceph_inode(inode);
280 struct iov_iter iter;
285 __set_bit(NETFS_SREQ_CLEAR_TAIL, &subreq->flags);
286 __clear_bit(NETFS_SREQ_COPY_TO_CACHE, &subreq->flags);
288 if (subreq->start >= inode->i_size)
291 /* We need to fetch the inline data. */
292 mode = ceph_try_to_choose_auth_mds(inode, CEPH_STAT_CAP_INLINE_DATA);
293 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, mode);
298 req->r_ino1 = ci->i_vino;
299 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INLINE_DATA);
302 err = ceph_mdsc_do_request(mdsc, NULL, req);
306 rinfo = &req->r_reply_info;
307 iinfo = &rinfo->targeti;
308 if (iinfo->inline_version == CEPH_INLINE_NONE) {
309 /* The data got uninlined */
310 ceph_mdsc_put_request(req);
314 len = min_t(size_t, iinfo->inline_len - subreq->start, subreq->len);
315 iov_iter_xarray(&iter, ITER_DEST, &rreq->mapping->i_pages, subreq->start, len);
316 err = copy_to_iter(iinfo->inline_data + subreq->start, len, &iter);
320 ceph_mdsc_put_request(req);
322 netfs_subreq_terminated(subreq, err, false);
326 static void ceph_netfs_issue_read(struct netfs_io_subrequest *subreq)
328 struct netfs_io_request *rreq = subreq->rreq;
329 struct inode *inode = rreq->inode;
330 struct ceph_inode_info *ci = ceph_inode(inode);
331 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
332 struct ceph_client *cl = fsc->client;
333 struct ceph_osd_request *req = NULL;
334 struct ceph_vino vino = ceph_vino(inode);
335 struct iov_iter iter;
337 u64 len = subreq->len;
338 bool sparse = IS_ENCRYPTED(inode) || ceph_test_mount_opt(fsc, SPARSEREAD);
339 u64 off = subreq->start;
342 if (ceph_inode_is_shutdown(inode)) {
347 if (ceph_has_inline_data(ci) && ceph_netfs_issue_op_inline(subreq))
350 ceph_fscrypt_adjust_off_and_len(inode, &off, &len);
352 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, vino,
353 off, &len, 0, 1, sparse ? CEPH_OSD_OP_SPARSE_READ : CEPH_OSD_OP_READ,
354 CEPH_OSD_FLAG_READ, NULL, ci->i_truncate_seq,
355 ci->i_truncate_size, false);
363 extent_cnt = __ceph_sparse_read_ext_count(inode, len);
364 err = ceph_alloc_sparse_ext_map(&req->r_ops[0], extent_cnt);
369 doutc(cl, "%llx.%llx pos=%llu orig_len=%zu len=%llu\n",
370 ceph_vinop(inode), subreq->start, subreq->len, len);
372 iov_iter_xarray(&iter, ITER_DEST, &rreq->mapping->i_pages, subreq->start, len);
375 * FIXME: For now, use CEPH_OSD_DATA_TYPE_PAGES instead of _ITER for
376 * encrypted inodes. We'd need infrastructure that handles an iov_iter
377 * instead of page arrays, and we don't have that as of yet. Once the
378 * dust settles on the write helpers and encrypt/decrypt routines for
379 * netfs, we should be able to rework this.
381 if (IS_ENCRYPTED(inode)) {
385 err = iov_iter_get_pages_alloc2(&iter, &pages, len, &page_off);
387 doutc(cl, "%llx.%llx failed to allocate pages, %d\n",
388 ceph_vinop(inode), err);
392 /* should always give us a page-aligned read */
393 WARN_ON_ONCE(page_off);
397 osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0, false,
400 osd_req_op_extent_osd_iter(req, 0, &iter);
402 if (!ceph_inc_osd_stopping_blocker(fsc->mdsc)) {
406 req->r_callback = finish_netfs_read;
407 req->r_priv = subreq;
408 req->r_inode = inode;
411 ceph_osdc_start_request(req->r_osdc, req);
413 ceph_osdc_put_request(req);
415 netfs_subreq_terminated(subreq, err, false);
416 doutc(cl, "%llx.%llx result %d\n", ceph_vinop(inode), err);
419 static int ceph_init_request(struct netfs_io_request *rreq, struct file *file)
421 struct inode *inode = rreq->inode;
422 struct ceph_client *cl = ceph_inode_to_client(inode);
423 int got = 0, want = CEPH_CAP_FILE_CACHE;
424 struct ceph_netfs_request_data *priv;
427 if (rreq->origin != NETFS_READAHEAD)
430 priv = kzalloc(sizeof(*priv), GFP_NOFS);
435 struct ceph_rw_context *rw_ctx;
436 struct ceph_file_info *fi = file->private_data;
438 priv->file_ra_pages = file->f_ra.ra_pages;
439 priv->file_ra_disabled = file->f_mode & FMODE_RANDOM;
441 rw_ctx = ceph_find_rw_context(fi);
443 rreq->netfs_priv = priv;
449 * readahead callers do not necessarily hold Fcb caps
450 * (e.g. fadvise, madvise).
452 ret = ceph_try_get_caps(inode, CEPH_CAP_FILE_RD, want, true, &got);
454 doutc(cl, "%llx.%llx, error getting cap\n", ceph_vinop(inode));
459 doutc(cl, "%llx.%llx, no cache cap\n", ceph_vinop(inode));
469 rreq->netfs_priv = priv;
478 static void ceph_netfs_free_request(struct netfs_io_request *rreq)
480 struct ceph_netfs_request_data *priv = rreq->netfs_priv;
486 ceph_put_cap_refs(ceph_inode(rreq->inode), priv->caps);
488 rreq->netfs_priv = NULL;
491 const struct netfs_request_ops ceph_netfs_ops = {
492 .init_request = ceph_init_request,
493 .free_request = ceph_netfs_free_request,
494 .issue_read = ceph_netfs_issue_read,
495 .expand_readahead = ceph_netfs_expand_readahead,
496 .clamp_length = ceph_netfs_clamp_length,
497 .check_write_begin = ceph_netfs_check_write_begin,
500 #ifdef CONFIG_CEPH_FSCACHE
501 static void ceph_set_page_fscache(struct page *page)
503 set_page_fscache(page);
506 static void ceph_fscache_write_terminated(void *priv, ssize_t error, bool was_async)
508 struct inode *inode = priv;
510 if (IS_ERR_VALUE(error) && error != -ENOBUFS)
511 ceph_fscache_invalidate(inode, false);
514 static void ceph_fscache_write_to_cache(struct inode *inode, u64 off, u64 len, bool caching)
516 struct ceph_inode_info *ci = ceph_inode(inode);
517 struct fscache_cookie *cookie = ceph_fscache_cookie(ci);
519 fscache_write_to_cache(cookie, inode->i_mapping, off, len, i_size_read(inode),
520 ceph_fscache_write_terminated, inode, caching);
523 static inline void ceph_set_page_fscache(struct page *page)
527 static inline void ceph_fscache_write_to_cache(struct inode *inode, u64 off, u64 len, bool caching)
530 #endif /* CONFIG_CEPH_FSCACHE */
532 struct ceph_writeback_ctl
542 * Get ref for the oldest snapc for an inode with dirty data... that is, the
543 * only snap context we are allowed to write back.
545 static struct ceph_snap_context *
546 get_oldest_context(struct inode *inode, struct ceph_writeback_ctl *ctl,
547 struct ceph_snap_context *page_snapc)
549 struct ceph_inode_info *ci = ceph_inode(inode);
550 struct ceph_client *cl = ceph_inode_to_client(inode);
551 struct ceph_snap_context *snapc = NULL;
552 struct ceph_cap_snap *capsnap = NULL;
554 spin_lock(&ci->i_ceph_lock);
555 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
556 doutc(cl, " capsnap %p snapc %p has %d dirty pages\n",
557 capsnap, capsnap->context, capsnap->dirty_pages);
558 if (!capsnap->dirty_pages)
561 /* get i_size, truncate_{seq,size} for page_snapc? */
562 if (snapc && capsnap->context != page_snapc)
566 if (capsnap->writing) {
567 ctl->i_size = i_size_read(inode);
568 ctl->size_stable = false;
570 ctl->i_size = capsnap->size;
571 ctl->size_stable = true;
573 ctl->truncate_size = capsnap->truncate_size;
574 ctl->truncate_seq = capsnap->truncate_seq;
575 ctl->head_snapc = false;
581 snapc = ceph_get_snap_context(capsnap->context);
583 page_snapc == snapc ||
584 page_snapc->seq > snapc->seq)
587 if (!snapc && ci->i_wrbuffer_ref_head) {
588 snapc = ceph_get_snap_context(ci->i_head_snapc);
589 doutc(cl, " head snapc %p has %d dirty pages\n", snapc,
590 ci->i_wrbuffer_ref_head);
592 ctl->i_size = i_size_read(inode);
593 ctl->truncate_size = ci->i_truncate_size;
594 ctl->truncate_seq = ci->i_truncate_seq;
595 ctl->size_stable = false;
596 ctl->head_snapc = true;
599 spin_unlock(&ci->i_ceph_lock);
603 static u64 get_writepages_data_length(struct inode *inode,
604 struct page *page, u64 start)
606 struct ceph_inode_info *ci = ceph_inode(inode);
607 struct ceph_snap_context *snapc;
608 struct ceph_cap_snap *capsnap = NULL;
609 u64 end = i_size_read(inode);
612 snapc = page_snap_context(ceph_fscrypt_pagecache_page(page));
613 if (snapc != ci->i_head_snapc) {
615 spin_lock(&ci->i_ceph_lock);
616 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
617 if (capsnap->context == snapc) {
618 if (!capsnap->writing)
624 spin_unlock(&ci->i_ceph_lock);
627 if (end > ceph_fscrypt_page_offset(page) + thp_size(page))
628 end = ceph_fscrypt_page_offset(page) + thp_size(page);
629 ret = end > start ? end - start : 0;
630 if (ret && fscrypt_is_bounce_page(page))
631 ret = round_up(ret, CEPH_FSCRYPT_BLOCK_SIZE);
636 * Write a single page, but leave the page locked.
638 * If we get a write error, mark the mapping for error, but still adjust the
639 * dirty page accounting (i.e., page is no longer dirty).
641 static int writepage_nounlock(struct page *page, struct writeback_control *wbc)
643 struct folio *folio = page_folio(page);
644 struct inode *inode = page->mapping->host;
645 struct ceph_inode_info *ci = ceph_inode(inode);
646 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
647 struct ceph_client *cl = fsc->client;
648 struct ceph_snap_context *snapc, *oldest;
649 loff_t page_off = page_offset(page);
651 loff_t len = thp_size(page);
653 struct ceph_writeback_ctl ceph_wbc;
654 struct ceph_osd_client *osdc = &fsc->client->osdc;
655 struct ceph_osd_request *req;
656 bool caching = ceph_is_cache_enabled(inode);
657 struct page *bounce_page = NULL;
659 doutc(cl, "%llx.%llx page %p idx %lu\n", ceph_vinop(inode), page,
662 if (ceph_inode_is_shutdown(inode))
665 /* verify this is a writeable snap context */
666 snapc = page_snap_context(page);
668 doutc(cl, "%llx.%llx page %p not dirty?\n", ceph_vinop(inode),
672 oldest = get_oldest_context(inode, &ceph_wbc, snapc);
673 if (snapc->seq > oldest->seq) {
674 doutc(cl, "%llx.%llx page %p snapc %p not writeable - noop\n",
675 ceph_vinop(inode), page, snapc);
676 /* we should only noop if called by kswapd */
677 WARN_ON(!(current->flags & PF_MEMALLOC));
678 ceph_put_snap_context(oldest);
679 redirty_page_for_writepage(wbc, page);
682 ceph_put_snap_context(oldest);
684 /* is this a partial page at end of file? */
685 if (page_off >= ceph_wbc.i_size) {
686 doutc(cl, "%llx.%llx folio at %lu beyond eof %llu\n",
687 ceph_vinop(inode), folio->index, ceph_wbc.i_size);
688 folio_invalidate(folio, 0, folio_size(folio));
692 if (ceph_wbc.i_size < page_off + len)
693 len = ceph_wbc.i_size - page_off;
695 wlen = IS_ENCRYPTED(inode) ? round_up(len, CEPH_FSCRYPT_BLOCK_SIZE) : len;
696 doutc(cl, "%llx.%llx page %p index %lu on %llu~%llu snapc %p seq %lld\n",
697 ceph_vinop(inode), page, page->index, page_off, wlen, snapc,
700 if (atomic_long_inc_return(&fsc->writeback_count) >
701 CONGESTION_ON_THRESH(fsc->mount_options->congestion_kb))
702 fsc->write_congested = true;
704 req = ceph_osdc_new_request(osdc, &ci->i_layout, ceph_vino(inode),
705 page_off, &wlen, 0, 1, CEPH_OSD_OP_WRITE,
706 CEPH_OSD_FLAG_WRITE, snapc,
707 ceph_wbc.truncate_seq,
708 ceph_wbc.truncate_size, true);
710 redirty_page_for_writepage(wbc, page);
717 set_page_writeback(page);
719 ceph_set_page_fscache(page);
720 ceph_fscache_write_to_cache(inode, page_off, len, caching);
722 if (IS_ENCRYPTED(inode)) {
723 bounce_page = fscrypt_encrypt_pagecache_blocks(page,
724 CEPH_FSCRYPT_BLOCK_SIZE, 0,
726 if (IS_ERR(bounce_page)) {
727 redirty_page_for_writepage(wbc, page);
728 end_page_writeback(page);
729 ceph_osdc_put_request(req);
730 return PTR_ERR(bounce_page);
734 /* it may be a short write due to an object boundary */
735 WARN_ON_ONCE(len > thp_size(page));
736 osd_req_op_extent_osd_data_pages(req, 0,
737 bounce_page ? &bounce_page : &page, wlen, 0,
739 doutc(cl, "%llx.%llx %llu~%llu (%llu bytes, %sencrypted)\n",
740 ceph_vinop(inode), page_off, len, wlen,
741 IS_ENCRYPTED(inode) ? "" : "not ");
743 req->r_mtime = inode_get_mtime(inode);
744 ceph_osdc_start_request(osdc, req);
745 err = ceph_osdc_wait_request(osdc, req);
747 ceph_update_write_metrics(&fsc->mdsc->metric, req->r_start_latency,
748 req->r_end_latency, len, err);
749 fscrypt_free_bounce_page(bounce_page);
750 ceph_osdc_put_request(req);
755 struct writeback_control tmp_wbc;
758 if (err == -ERESTARTSYS) {
759 /* killed by SIGKILL */
760 doutc(cl, "%llx.%llx interrupted page %p\n",
761 ceph_vinop(inode), page);
762 redirty_page_for_writepage(wbc, page);
763 end_page_writeback(page);
766 if (err == -EBLOCKLISTED)
767 fsc->blocklisted = true;
768 doutc(cl, "%llx.%llx setting page/mapping error %d %p\n",
769 ceph_vinop(inode), err, page);
770 mapping_set_error(&inode->i_data, err);
771 wbc->pages_skipped++;
773 doutc(cl, "%llx.%llx cleaned page %p\n",
774 ceph_vinop(inode), page);
775 err = 0; /* vfs expects us to return 0 */
777 oldest = detach_page_private(page);
778 WARN_ON_ONCE(oldest != snapc);
779 end_page_writeback(page);
780 ceph_put_wrbuffer_cap_refs(ci, 1, snapc);
781 ceph_put_snap_context(snapc); /* page's reference */
783 if (atomic_long_dec_return(&fsc->writeback_count) <
784 CONGESTION_OFF_THRESH(fsc->mount_options->congestion_kb))
785 fsc->write_congested = false;
790 static int ceph_writepage(struct page *page, struct writeback_control *wbc)
793 struct inode *inode = page->mapping->host;
797 if (wbc->sync_mode == WB_SYNC_NONE &&
798 ceph_inode_to_fs_client(inode)->write_congested) {
799 redirty_page_for_writepage(wbc, page);
800 return AOP_WRITEPAGE_ACTIVATE;
803 wait_on_page_fscache(page);
805 err = writepage_nounlock(page, wbc);
806 if (err == -ERESTARTSYS) {
807 /* direct memory reclaimer was killed by SIGKILL. return 0
808 * to prevent caller from setting mapping/page error */
817 * async writeback completion handler.
819 * If we get an error, set the mapping error bit, but not the individual
822 static void writepages_finish(struct ceph_osd_request *req)
824 struct inode *inode = req->r_inode;
825 struct ceph_inode_info *ci = ceph_inode(inode);
826 struct ceph_client *cl = ceph_inode_to_client(inode);
827 struct ceph_osd_data *osd_data;
829 int num_pages, total_pages = 0;
831 int rc = req->r_result;
832 struct ceph_snap_context *snapc = req->r_snapc;
833 struct address_space *mapping = inode->i_mapping;
834 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
835 unsigned int len = 0;
838 doutc(cl, "%llx.%llx rc %d\n", ceph_vinop(inode), rc);
840 mapping_set_error(mapping, rc);
841 ceph_set_error_write(ci);
842 if (rc == -EBLOCKLISTED)
843 fsc->blocklisted = true;
845 ceph_clear_error_write(ci);
849 * We lost the cache cap, need to truncate the page before
850 * it is unlocked, otherwise we'd truncate it later in the
851 * page truncation thread, possibly losing some data that
854 remove_page = !(ceph_caps_issued(ci) &
855 (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO));
857 /* clean all pages */
858 for (i = 0; i < req->r_num_ops; i++) {
859 if (req->r_ops[i].op != CEPH_OSD_OP_WRITE) {
861 "%llx.%llx incorrect op %d req %p index %d tid %llu\n",
862 ceph_vinop(inode), req->r_ops[i].op, req, i,
867 osd_data = osd_req_op_extent_osd_data(req, i);
868 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES);
869 len += osd_data->length;
870 num_pages = calc_pages_for((u64)osd_data->alignment,
871 (u64)osd_data->length);
872 total_pages += num_pages;
873 for (j = 0; j < num_pages; j++) {
874 page = osd_data->pages[j];
875 if (fscrypt_is_bounce_page(page)) {
876 page = fscrypt_pagecache_page(page);
877 fscrypt_free_bounce_page(osd_data->pages[j]);
878 osd_data->pages[j] = page;
881 WARN_ON(!PageUptodate(page));
883 if (atomic_long_dec_return(&fsc->writeback_count) <
884 CONGESTION_OFF_THRESH(
885 fsc->mount_options->congestion_kb))
886 fsc->write_congested = false;
888 ceph_put_snap_context(detach_page_private(page));
889 end_page_writeback(page);
890 doutc(cl, "unlocking %p\n", page);
893 generic_error_remove_folio(inode->i_mapping,
898 doutc(cl, "%llx.%llx wrote %llu bytes cleaned %d pages\n",
899 ceph_vinop(inode), osd_data->length,
900 rc >= 0 ? num_pages : 0);
902 release_pages(osd_data->pages, num_pages);
905 ceph_update_write_metrics(&fsc->mdsc->metric, req->r_start_latency,
906 req->r_end_latency, len, rc);
908 ceph_put_wrbuffer_cap_refs(ci, total_pages, snapc);
910 osd_data = osd_req_op_extent_osd_data(req, 0);
911 if (osd_data->pages_from_pool)
912 mempool_free(osd_data->pages, ceph_wb_pagevec_pool);
914 kfree(osd_data->pages);
915 ceph_osdc_put_request(req);
916 ceph_dec_osd_stopping_blocker(fsc->mdsc);
920 * initiate async writeback
922 static int ceph_writepages_start(struct address_space *mapping,
923 struct writeback_control *wbc)
925 struct inode *inode = mapping->host;
926 struct ceph_inode_info *ci = ceph_inode(inode);
927 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
928 struct ceph_client *cl = fsc->client;
929 struct ceph_vino vino = ceph_vino(inode);
930 pgoff_t index, start_index, end = -1;
931 struct ceph_snap_context *snapc = NULL, *last_snapc = NULL, *pgsnapc;
932 struct folio_batch fbatch;
934 unsigned int wsize = i_blocksize(inode);
935 struct ceph_osd_request *req = NULL;
936 struct ceph_writeback_ctl ceph_wbc;
937 bool should_loop, range_whole = false;
939 bool caching = ceph_is_cache_enabled(inode);
942 if (wbc->sync_mode == WB_SYNC_NONE &&
943 fsc->write_congested)
946 doutc(cl, "%llx.%llx (mode=%s)\n", ceph_vinop(inode),
947 wbc->sync_mode == WB_SYNC_NONE ? "NONE" :
948 (wbc->sync_mode == WB_SYNC_ALL ? "ALL" : "HOLD"));
950 if (ceph_inode_is_shutdown(inode)) {
951 if (ci->i_wrbuffer_ref > 0) {
952 pr_warn_ratelimited_client(cl,
953 "%llx.%llx %lld forced umount\n",
954 ceph_vinop(inode), ceph_ino(inode));
956 mapping_set_error(mapping, -EIO);
957 return -EIO; /* we're in a forced umount, don't write! */
959 if (fsc->mount_options->wsize < wsize)
960 wsize = fsc->mount_options->wsize;
962 folio_batch_init(&fbatch);
964 start_index = wbc->range_cyclic ? mapping->writeback_index : 0;
967 if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages) {
968 tag = PAGECACHE_TAG_TOWRITE;
970 tag = PAGECACHE_TAG_DIRTY;
973 /* find oldest snap context with dirty data */
974 snapc = get_oldest_context(inode, &ceph_wbc, NULL);
976 /* hmm, why does writepages get called when there
978 doutc(cl, " no snap context with dirty data?\n");
981 doutc(cl, " oldest snapc is %p seq %lld (%d snaps)\n", snapc,
982 snapc->seq, snapc->num_snaps);
985 if (ceph_wbc.head_snapc && snapc != last_snapc) {
986 /* where to start/end? */
987 if (wbc->range_cyclic) {
992 doutc(cl, " cyclic, start at %lu\n", index);
994 index = wbc->range_start >> PAGE_SHIFT;
995 end = wbc->range_end >> PAGE_SHIFT;
996 if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
998 doutc(cl, " not cyclic, %lu to %lu\n", index, end);
1000 } else if (!ceph_wbc.head_snapc) {
1001 /* Do not respect wbc->range_{start,end}. Dirty pages
1002 * in that range can be associated with newer snapc.
1003 * They are not writeable until we write all dirty pages
1004 * associated with 'snapc' get written */
1007 doutc(cl, " non-head snapc, range whole\n");
1010 if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages)
1011 tag_pages_for_writeback(mapping, index, end);
1013 ceph_put_snap_context(last_snapc);
1016 while (!done && index <= end) {
1017 int num_ops = 0, op_idx;
1018 unsigned i, nr_folios, max_pages, locked_pages = 0;
1019 struct page **pages = NULL, **data_pages;
1021 pgoff_t strip_unit_end = 0;
1022 u64 offset = 0, len = 0;
1023 bool from_pool = false;
1025 max_pages = wsize >> PAGE_SHIFT;
1028 nr_folios = filemap_get_folios_tag(mapping, &index,
1030 doutc(cl, "pagevec_lookup_range_tag got %d\n", nr_folios);
1031 if (!nr_folios && !locked_pages)
1033 for (i = 0; i < nr_folios && locked_pages < max_pages; i++) {
1034 page = &fbatch.folios[i]->page;
1035 doutc(cl, "? %p idx %lu\n", page, page->index);
1036 if (locked_pages == 0)
1037 lock_page(page); /* first page */
1038 else if (!trylock_page(page))
1041 /* only dirty pages, or our accounting breaks */
1042 if (unlikely(!PageDirty(page)) ||
1043 unlikely(page->mapping != mapping)) {
1044 doutc(cl, "!dirty or !mapping %p\n", page);
1048 /* only if matching snap context */
1049 pgsnapc = page_snap_context(page);
1050 if (pgsnapc != snapc) {
1051 doutc(cl, "page snapc %p %lld != oldest %p %lld\n",
1052 pgsnapc, pgsnapc->seq, snapc, snapc->seq);
1054 !ceph_wbc.head_snapc &&
1055 wbc->sync_mode != WB_SYNC_NONE)
1060 if (page_offset(page) >= ceph_wbc.i_size) {
1061 struct folio *folio = page_folio(page);
1063 doutc(cl, "folio at %lu beyond eof %llu\n",
1064 folio->index, ceph_wbc.i_size);
1065 if ((ceph_wbc.size_stable ||
1066 folio_pos(folio) >= i_size_read(inode)) &&
1067 folio_clear_dirty_for_io(folio))
1068 folio_invalidate(folio, 0,
1070 folio_unlock(folio);
1073 if (strip_unit_end && (page->index > strip_unit_end)) {
1074 doutc(cl, "end of strip unit %p\n", page);
1078 if (PageWriteback(page) || PageFsCache(page)) {
1079 if (wbc->sync_mode == WB_SYNC_NONE) {
1080 doutc(cl, "%p under writeback\n", page);
1084 doutc(cl, "waiting on writeback %p\n", page);
1085 wait_on_page_writeback(page);
1086 wait_on_page_fscache(page);
1089 if (!clear_page_dirty_for_io(page)) {
1090 doutc(cl, "%p !clear_page_dirty_for_io\n", page);
1096 * We have something to write. If this is
1097 * the first locked page this time through,
1098 * calculate max possinle write size and
1099 * allocate a page array
1101 if (locked_pages == 0) {
1106 /* prepare async write request */
1107 offset = (u64)page_offset(page);
1108 ceph_calc_file_object_mapping(&ci->i_layout,
1115 strip_unit_end = page->index +
1116 ((len - 1) >> PAGE_SHIFT);
1119 max_pages = calc_pages_for(0, (u64)len);
1120 pages = kmalloc_array(max_pages,
1125 pages = mempool_alloc(ceph_wb_pagevec_pool, GFP_NOFS);
1130 } else if (page->index !=
1131 (offset + len) >> PAGE_SHIFT) {
1132 if (num_ops >= (from_pool ? CEPH_OSD_SLAB_OPS :
1133 CEPH_OSD_MAX_OPS)) {
1134 redirty_page_for_writepage(wbc, page);
1140 offset = (u64)page_offset(page);
1144 /* note position of first page in fbatch */
1145 doutc(cl, "%llx.%llx will write page %p idx %lu\n",
1146 ceph_vinop(inode), page, page->index);
1148 if (atomic_long_inc_return(&fsc->writeback_count) >
1149 CONGESTION_ON_THRESH(
1150 fsc->mount_options->congestion_kb))
1151 fsc->write_congested = true;
1153 if (IS_ENCRYPTED(inode)) {
1154 pages[locked_pages] =
1155 fscrypt_encrypt_pagecache_blocks(page,
1157 locked_pages ? GFP_NOWAIT : GFP_NOFS);
1158 if (IS_ERR(pages[locked_pages])) {
1159 if (PTR_ERR(pages[locked_pages]) == -EINVAL)
1161 "inode->i_blkbits=%hhu\n",
1163 /* better not fail on first page! */
1164 BUG_ON(locked_pages == 0);
1165 pages[locked_pages] = NULL;
1166 redirty_page_for_writepage(wbc, page);
1172 pages[locked_pages++] = page;
1175 fbatch.folios[i] = NULL;
1176 len += thp_size(page);
1179 /* did we get anything? */
1181 goto release_folios;
1184 /* shift unused page to beginning of fbatch */
1185 for (j = 0; j < nr_folios; j++) {
1186 if (!fbatch.folios[j])
1189 fbatch.folios[n] = fbatch.folios[j];
1194 if (nr_folios && i == nr_folios &&
1195 locked_pages < max_pages) {
1196 doutc(cl, "reached end fbatch, trying for more\n");
1197 folio_batch_release(&fbatch);
1198 goto get_more_pages;
1203 offset = ceph_fscrypt_page_offset(pages[0]);
1206 req = ceph_osdc_new_request(&fsc->client->osdc,
1207 &ci->i_layout, vino,
1208 offset, &len, 0, num_ops,
1209 CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE,
1210 snapc, ceph_wbc.truncate_seq,
1211 ceph_wbc.truncate_size, false);
1213 req = ceph_osdc_new_request(&fsc->client->osdc,
1214 &ci->i_layout, vino,
1219 CEPH_OSD_FLAG_WRITE,
1220 snapc, ceph_wbc.truncate_seq,
1221 ceph_wbc.truncate_size, true);
1222 BUG_ON(IS_ERR(req));
1224 BUG_ON(len < ceph_fscrypt_page_offset(pages[locked_pages - 1]) +
1225 thp_size(pages[locked_pages - 1]) - offset);
1227 if (!ceph_inc_osd_stopping_blocker(fsc->mdsc)) {
1229 goto release_folios;
1231 req->r_callback = writepages_finish;
1232 req->r_inode = inode;
1234 /* Format the osd request message and submit the write */
1238 for (i = 0; i < locked_pages; i++) {
1239 struct page *page = ceph_fscrypt_pagecache_page(pages[i]);
1241 u64 cur_offset = page_offset(page);
1243 * Discontinuity in page range? Ceph can handle that by just passing
1244 * multiple extents in the write op.
1246 if (offset + len != cur_offset) {
1247 /* If it's full, stop here */
1248 if (op_idx + 1 == req->r_num_ops)
1251 /* Kick off an fscache write with what we have so far. */
1252 ceph_fscache_write_to_cache(inode, offset, len, caching);
1254 /* Start a new extent */
1255 osd_req_op_extent_dup_last(req, op_idx,
1256 cur_offset - offset);
1257 doutc(cl, "got pages at %llu~%llu\n", offset,
1259 osd_req_op_extent_osd_data_pages(req, op_idx,
1262 osd_req_op_extent_update(req, op_idx, len);
1265 offset = cur_offset;
1266 data_pages = pages + i;
1270 set_page_writeback(page);
1272 ceph_set_page_fscache(page);
1273 len += thp_size(page);
1275 ceph_fscache_write_to_cache(inode, offset, len, caching);
1277 if (ceph_wbc.size_stable) {
1278 len = min(len, ceph_wbc.i_size - offset);
1279 } else if (i == locked_pages) {
1280 /* writepages_finish() clears writeback pages
1281 * according to the data length, so make sure
1282 * data length covers all locked pages */
1283 u64 min_len = len + 1 - thp_size(page);
1284 len = get_writepages_data_length(inode, pages[i - 1],
1286 len = max(len, min_len);
1288 if (IS_ENCRYPTED(inode))
1289 len = round_up(len, CEPH_FSCRYPT_BLOCK_SIZE);
1291 doutc(cl, "got pages at %llu~%llu\n", offset, len);
1293 if (IS_ENCRYPTED(inode) &&
1294 ((offset | len) & ~CEPH_FSCRYPT_BLOCK_MASK))
1296 "bad encrypted write offset=%lld len=%llu\n",
1299 osd_req_op_extent_osd_data_pages(req, op_idx, data_pages, len,
1300 0, from_pool, false);
1301 osd_req_op_extent_update(req, op_idx, len);
1303 BUG_ON(op_idx + 1 != req->r_num_ops);
1306 if (i < locked_pages) {
1307 BUG_ON(num_ops <= req->r_num_ops);
1308 num_ops -= req->r_num_ops;
1311 /* allocate new pages array for next request */
1313 pages = kmalloc_array(locked_pages, sizeof(*pages),
1317 pages = mempool_alloc(ceph_wb_pagevec_pool, GFP_NOFS);
1320 memcpy(pages, data_pages + i,
1321 locked_pages * sizeof(*pages));
1322 memset(data_pages + i, 0,
1323 locked_pages * sizeof(*pages));
1325 BUG_ON(num_ops != req->r_num_ops);
1326 index = pages[i - 1]->index + 1;
1327 /* request message now owns the pages array */
1331 req->r_mtime = inode_get_mtime(inode);
1332 ceph_osdc_start_request(&fsc->client->osdc, req);
1335 wbc->nr_to_write -= i;
1340 * We stop writing back only if we are not doing
1341 * integrity sync. In case of integrity sync we have to
1342 * keep going until we have written all the pages
1343 * we tagged for writeback prior to entering this loop.
1345 if (wbc->nr_to_write <= 0 && wbc->sync_mode == WB_SYNC_NONE)
1349 doutc(cl, "folio_batch release on %d folios (%p)\n",
1350 (int)fbatch.nr, fbatch.nr ? fbatch.folios[0] : NULL);
1351 folio_batch_release(&fbatch);
1354 if (should_loop && !done) {
1355 /* more to do; loop back to beginning of file */
1356 doutc(cl, "looping back to beginning of file\n");
1357 end = start_index - 1; /* OK even when start_index == 0 */
1359 /* to write dirty pages associated with next snapc,
1360 * we need to wait until current writes complete */
1361 if (wbc->sync_mode != WB_SYNC_NONE &&
1362 start_index == 0 && /* all dirty pages were checked */
1363 !ceph_wbc.head_snapc) {
1367 while ((index <= end) &&
1368 (nr = filemap_get_folios_tag(mapping, &index,
1370 PAGECACHE_TAG_WRITEBACK,
1372 for (i = 0; i < nr; i++) {
1373 page = &fbatch.folios[i]->page;
1374 if (page_snap_context(page) != snapc)
1376 wait_on_page_writeback(page);
1378 folio_batch_release(&fbatch);
1388 if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
1389 mapping->writeback_index = index;
1392 ceph_osdc_put_request(req);
1393 ceph_put_snap_context(last_snapc);
1394 doutc(cl, "%llx.%llx dend - startone, rc = %d\n", ceph_vinop(inode),
1402 * See if a given @snapc is either writeable, or already written.
1404 static int context_is_writeable_or_written(struct inode *inode,
1405 struct ceph_snap_context *snapc)
1407 struct ceph_snap_context *oldest = get_oldest_context(inode, NULL, NULL);
1408 int ret = !oldest || snapc->seq <= oldest->seq;
1410 ceph_put_snap_context(oldest);
1415 * ceph_find_incompatible - find an incompatible context and return it
1416 * @page: page being dirtied
1418 * We are only allowed to write into/dirty a page if the page is
1419 * clean, or already dirty within the same snap context. Returns a
1420 * conflicting context if there is one, NULL if there isn't, or a
1421 * negative error code on other errors.
1423 * Must be called with page lock held.
1425 static struct ceph_snap_context *
1426 ceph_find_incompatible(struct page *page)
1428 struct inode *inode = page->mapping->host;
1429 struct ceph_client *cl = ceph_inode_to_client(inode);
1430 struct ceph_inode_info *ci = ceph_inode(inode);
1432 if (ceph_inode_is_shutdown(inode)) {
1433 doutc(cl, " %llx.%llx page %p is shutdown\n",
1434 ceph_vinop(inode), page);
1435 return ERR_PTR(-ESTALE);
1439 struct ceph_snap_context *snapc, *oldest;
1441 wait_on_page_writeback(page);
1443 snapc = page_snap_context(page);
1444 if (!snapc || snapc == ci->i_head_snapc)
1448 * this page is already dirty in another (older) snap
1449 * context! is it writeable now?
1451 oldest = get_oldest_context(inode, NULL, NULL);
1452 if (snapc->seq > oldest->seq) {
1453 /* not writeable -- return it for the caller to deal with */
1454 ceph_put_snap_context(oldest);
1455 doutc(cl, " %llx.%llx page %p snapc %p not current or oldest\n",
1456 ceph_vinop(inode), page, snapc);
1457 return ceph_get_snap_context(snapc);
1459 ceph_put_snap_context(oldest);
1461 /* yay, writeable, do it now (without dropping page lock) */
1462 doutc(cl, " %llx.%llx page %p snapc %p not current, but oldest\n",
1463 ceph_vinop(inode), page, snapc);
1464 if (clear_page_dirty_for_io(page)) {
1465 int r = writepage_nounlock(page, NULL);
1473 static int ceph_netfs_check_write_begin(struct file *file, loff_t pos, unsigned int len,
1474 struct folio **foliop, void **_fsdata)
1476 struct inode *inode = file_inode(file);
1477 struct ceph_inode_info *ci = ceph_inode(inode);
1478 struct ceph_snap_context *snapc;
1480 snapc = ceph_find_incompatible(folio_page(*foliop, 0));
1484 folio_unlock(*foliop);
1488 return PTR_ERR(snapc);
1490 ceph_queue_writeback(inode);
1491 r = wait_event_killable(ci->i_cap_wq,
1492 context_is_writeable_or_written(inode, snapc));
1493 ceph_put_snap_context(snapc);
1494 return r == 0 ? -EAGAIN : r;
1500 * We are only allowed to write into/dirty the page if the page is
1501 * clean, or already dirty within the same snap context.
1503 static int ceph_write_begin(struct file *file, struct address_space *mapping,
1504 loff_t pos, unsigned len,
1505 struct page **pagep, void **fsdata)
1507 struct inode *inode = file_inode(file);
1508 struct ceph_inode_info *ci = ceph_inode(inode);
1509 struct folio *folio = NULL;
1512 r = netfs_write_begin(&ci->netfs, file, inode->i_mapping, pos, len, &folio, NULL);
1516 folio_wait_fscache(folio);
1517 WARN_ON_ONCE(!folio_test_locked(folio));
1518 *pagep = &folio->page;
1523 * we don't do anything in here that simple_write_end doesn't do
1524 * except adjust dirty page accounting
1526 static int ceph_write_end(struct file *file, struct address_space *mapping,
1527 loff_t pos, unsigned len, unsigned copied,
1528 struct page *subpage, void *fsdata)
1530 struct folio *folio = page_folio(subpage);
1531 struct inode *inode = file_inode(file);
1532 struct ceph_client *cl = ceph_inode_to_client(inode);
1533 bool check_cap = false;
1535 doutc(cl, "%llx.%llx file %p folio %p %d~%d (%d)\n", ceph_vinop(inode),
1536 file, folio, (int)pos, (int)copied, (int)len);
1538 if (!folio_test_uptodate(folio)) {
1539 /* just return that nothing was copied on a short copy */
1544 folio_mark_uptodate(folio);
1547 /* did file size increase? */
1548 if (pos+copied > i_size_read(inode))
1549 check_cap = ceph_inode_set_size(inode, pos+copied);
1551 folio_mark_dirty(folio);
1554 folio_unlock(folio);
1558 ceph_check_caps(ceph_inode(inode), CHECK_CAPS_AUTHONLY);
1563 const struct address_space_operations ceph_aops = {
1564 .read_folio = netfs_read_folio,
1565 .readahead = netfs_readahead,
1566 .writepage = ceph_writepage,
1567 .writepages = ceph_writepages_start,
1568 .write_begin = ceph_write_begin,
1569 .write_end = ceph_write_end,
1570 .dirty_folio = ceph_dirty_folio,
1571 .invalidate_folio = ceph_invalidate_folio,
1572 .release_folio = netfs_release_folio,
1573 .direct_IO = noop_direct_IO,
1576 static void ceph_block_sigs(sigset_t *oldset)
1579 siginitsetinv(&mask, sigmask(SIGKILL));
1580 sigprocmask(SIG_BLOCK, &mask, oldset);
1583 static void ceph_restore_sigs(sigset_t *oldset)
1585 sigprocmask(SIG_SETMASK, oldset, NULL);
1591 static vm_fault_t ceph_filemap_fault(struct vm_fault *vmf)
1593 struct vm_area_struct *vma = vmf->vma;
1594 struct inode *inode = file_inode(vma->vm_file);
1595 struct ceph_inode_info *ci = ceph_inode(inode);
1596 struct ceph_client *cl = ceph_inode_to_client(inode);
1597 struct ceph_file_info *fi = vma->vm_file->private_data;
1598 loff_t off = (loff_t)vmf->pgoff << PAGE_SHIFT;
1601 vm_fault_t ret = VM_FAULT_SIGBUS;
1603 if (ceph_inode_is_shutdown(inode))
1606 ceph_block_sigs(&oldset);
1608 doutc(cl, "%llx.%llx %llu trying to get caps\n",
1609 ceph_vinop(inode), off);
1610 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1611 want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
1613 want = CEPH_CAP_FILE_CACHE;
1616 err = ceph_get_caps(vma->vm_file, CEPH_CAP_FILE_RD, want, -1, &got);
1620 doutc(cl, "%llx.%llx %llu got cap refs on %s\n", ceph_vinop(inode),
1621 off, ceph_cap_string(got));
1623 if ((got & (CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO)) ||
1624 !ceph_has_inline_data(ci)) {
1625 CEPH_DEFINE_RW_CONTEXT(rw_ctx, got);
1626 ceph_add_rw_context(fi, &rw_ctx);
1627 ret = filemap_fault(vmf);
1628 ceph_del_rw_context(fi, &rw_ctx);
1629 doutc(cl, "%llx.%llx %llu drop cap refs %s ret %x\n",
1630 ceph_vinop(inode), off, ceph_cap_string(got), ret);
1634 ceph_put_cap_refs(ci, got);
1639 /* read inline data */
1640 if (off >= PAGE_SIZE) {
1641 /* does not support inline data > PAGE_SIZE */
1642 ret = VM_FAULT_SIGBUS;
1644 struct address_space *mapping = inode->i_mapping;
1647 filemap_invalidate_lock_shared(mapping);
1648 page = find_or_create_page(mapping, 0,
1649 mapping_gfp_constraint(mapping, ~__GFP_FS));
1654 err = __ceph_do_getattr(inode, page,
1655 CEPH_STAT_CAP_INLINE_DATA, true);
1656 if (err < 0 || off >= i_size_read(inode)) {
1659 ret = vmf_error(err);
1662 if (err < PAGE_SIZE)
1663 zero_user_segment(page, err, PAGE_SIZE);
1665 flush_dcache_page(page);
1666 SetPageUptodate(page);
1668 ret = VM_FAULT_MAJOR | VM_FAULT_LOCKED;
1670 filemap_invalidate_unlock_shared(mapping);
1671 doutc(cl, "%llx.%llx %llu read inline data ret %x\n",
1672 ceph_vinop(inode), off, ret);
1675 ceph_restore_sigs(&oldset);
1677 ret = vmf_error(err);
1682 static vm_fault_t ceph_page_mkwrite(struct vm_fault *vmf)
1684 struct vm_area_struct *vma = vmf->vma;
1685 struct inode *inode = file_inode(vma->vm_file);
1686 struct ceph_client *cl = ceph_inode_to_client(inode);
1687 struct ceph_inode_info *ci = ceph_inode(inode);
1688 struct ceph_file_info *fi = vma->vm_file->private_data;
1689 struct ceph_cap_flush *prealloc_cf;
1690 struct page *page = vmf->page;
1691 loff_t off = page_offset(page);
1692 loff_t size = i_size_read(inode);
1696 vm_fault_t ret = VM_FAULT_SIGBUS;
1698 if (ceph_inode_is_shutdown(inode))
1701 prealloc_cf = ceph_alloc_cap_flush();
1703 return VM_FAULT_OOM;
1705 sb_start_pagefault(inode->i_sb);
1706 ceph_block_sigs(&oldset);
1708 if (off + thp_size(page) <= size)
1709 len = thp_size(page);
1711 len = offset_in_thp(page, size);
1713 doutc(cl, "%llx.%llx %llu~%zd getting caps i_size %llu\n",
1714 ceph_vinop(inode), off, len, size);
1715 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1716 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
1718 want = CEPH_CAP_FILE_BUFFER;
1721 err = ceph_get_caps(vma->vm_file, CEPH_CAP_FILE_WR, want, off + len, &got);
1725 doutc(cl, "%llx.%llx %llu~%zd got cap refs on %s\n", ceph_vinop(inode),
1726 off, len, ceph_cap_string(got));
1728 /* Update time before taking page lock */
1729 file_update_time(vma->vm_file);
1730 inode_inc_iversion_raw(inode);
1733 struct ceph_snap_context *snapc;
1737 if (page_mkwrite_check_truncate(page, inode) < 0) {
1739 ret = VM_FAULT_NOPAGE;
1743 snapc = ceph_find_incompatible(page);
1745 /* success. we'll keep the page locked. */
1746 set_page_dirty(page);
1747 ret = VM_FAULT_LOCKED;
1753 if (IS_ERR(snapc)) {
1754 ret = VM_FAULT_SIGBUS;
1758 ceph_queue_writeback(inode);
1759 err = wait_event_killable(ci->i_cap_wq,
1760 context_is_writeable_or_written(inode, snapc));
1761 ceph_put_snap_context(snapc);
1764 if (ret == VM_FAULT_LOCKED) {
1766 spin_lock(&ci->i_ceph_lock);
1767 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
1769 spin_unlock(&ci->i_ceph_lock);
1771 __mark_inode_dirty(inode, dirty);
1774 doutc(cl, "%llx.%llx %llu~%zd dropping cap refs on %s ret %x\n",
1775 ceph_vinop(inode), off, len, ceph_cap_string(got), ret);
1776 ceph_put_cap_refs_async(ci, got);
1778 ceph_restore_sigs(&oldset);
1779 sb_end_pagefault(inode->i_sb);
1780 ceph_free_cap_flush(prealloc_cf);
1782 ret = vmf_error(err);
1786 void ceph_fill_inline_data(struct inode *inode, struct page *locked_page,
1787 char *data, size_t len)
1789 struct ceph_client *cl = ceph_inode_to_client(inode);
1790 struct address_space *mapping = inode->i_mapping;
1796 if (i_size_read(inode) == 0)
1798 page = find_or_create_page(mapping, 0,
1799 mapping_gfp_constraint(mapping,
1803 if (PageUptodate(page)) {
1810 doutc(cl, "%p %llx.%llx len %zu locked_page %p\n", inode,
1811 ceph_vinop(inode), len, locked_page);
1814 void *kaddr = kmap_atomic(page);
1815 memcpy(kaddr, data, len);
1816 kunmap_atomic(kaddr);
1819 if (page != locked_page) {
1820 if (len < PAGE_SIZE)
1821 zero_user_segment(page, len, PAGE_SIZE);
1823 flush_dcache_page(page);
1825 SetPageUptodate(page);
1831 int ceph_uninline_data(struct file *file)
1833 struct inode *inode = file_inode(file);
1834 struct ceph_inode_info *ci = ceph_inode(inode);
1835 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
1836 struct ceph_client *cl = fsc->client;
1837 struct ceph_osd_request *req = NULL;
1838 struct ceph_cap_flush *prealloc_cf = NULL;
1839 struct folio *folio = NULL;
1840 u64 inline_version = CEPH_INLINE_NONE;
1841 struct page *pages[1];
1845 spin_lock(&ci->i_ceph_lock);
1846 inline_version = ci->i_inline_version;
1847 spin_unlock(&ci->i_ceph_lock);
1849 doutc(cl, "%llx.%llx inline_version %llu\n", ceph_vinop(inode),
1852 if (ceph_inode_is_shutdown(inode)) {
1857 if (inline_version == CEPH_INLINE_NONE)
1860 prealloc_cf = ceph_alloc_cap_flush();
1864 if (inline_version == 1) /* initial version, no data */
1867 folio = read_mapping_folio(inode->i_mapping, 0, file);
1868 if (IS_ERR(folio)) {
1869 err = PTR_ERR(folio);
1875 len = i_size_read(inode);
1876 if (len > folio_size(folio))
1877 len = folio_size(folio);
1879 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1880 ceph_vino(inode), 0, &len, 0, 1,
1881 CEPH_OSD_OP_CREATE, CEPH_OSD_FLAG_WRITE,
1888 req->r_mtime = inode_get_mtime(inode);
1889 ceph_osdc_start_request(&fsc->client->osdc, req);
1890 err = ceph_osdc_wait_request(&fsc->client->osdc, req);
1891 ceph_osdc_put_request(req);
1895 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1896 ceph_vino(inode), 0, &len, 1, 3,
1897 CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE,
1898 NULL, ci->i_truncate_seq,
1899 ci->i_truncate_size, false);
1905 pages[0] = folio_page(folio, 0);
1906 osd_req_op_extent_osd_data_pages(req, 1, pages, len, 0, false, false);
1909 __le64 xattr_buf = cpu_to_le64(inline_version);
1910 err = osd_req_op_xattr_init(req, 0, CEPH_OSD_OP_CMPXATTR,
1911 "inline_version", &xattr_buf,
1913 CEPH_OSD_CMPXATTR_OP_GT,
1914 CEPH_OSD_CMPXATTR_MODE_U64);
1921 int xattr_len = snprintf(xattr_buf, sizeof(xattr_buf),
1922 "%llu", inline_version);
1923 err = osd_req_op_xattr_init(req, 2, CEPH_OSD_OP_SETXATTR,
1925 xattr_buf, xattr_len, 0, 0);
1930 req->r_mtime = inode_get_mtime(inode);
1931 ceph_osdc_start_request(&fsc->client->osdc, req);
1932 err = ceph_osdc_wait_request(&fsc->client->osdc, req);
1934 ceph_update_write_metrics(&fsc->mdsc->metric, req->r_start_latency,
1935 req->r_end_latency, len, err);
1941 /* Set to CAP_INLINE_NONE and dirty the caps */
1942 down_read(&fsc->mdsc->snap_rwsem);
1943 spin_lock(&ci->i_ceph_lock);
1944 ci->i_inline_version = CEPH_INLINE_NONE;
1945 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR, &prealloc_cf);
1946 spin_unlock(&ci->i_ceph_lock);
1947 up_read(&fsc->mdsc->snap_rwsem);
1949 __mark_inode_dirty(inode, dirty);
1952 ceph_osdc_put_request(req);
1953 if (err == -ECANCELED)
1957 folio_unlock(folio);
1961 ceph_free_cap_flush(prealloc_cf);
1962 doutc(cl, "%llx.%llx inline_version %llu = %d\n",
1963 ceph_vinop(inode), inline_version, err);
1967 static const struct vm_operations_struct ceph_vmops = {
1968 .fault = ceph_filemap_fault,
1969 .page_mkwrite = ceph_page_mkwrite,
1972 int ceph_mmap(struct file *file, struct vm_area_struct *vma)
1974 struct address_space *mapping = file->f_mapping;
1976 if (!mapping->a_ops->read_folio)
1978 vma->vm_ops = &ceph_vmops;
1987 static int __ceph_pool_perm_get(struct ceph_inode_info *ci,
1988 s64 pool, struct ceph_string *pool_ns)
1990 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(&ci->netfs.inode);
1991 struct ceph_mds_client *mdsc = fsc->mdsc;
1992 struct ceph_client *cl = fsc->client;
1993 struct ceph_osd_request *rd_req = NULL, *wr_req = NULL;
1994 struct rb_node **p, *parent;
1995 struct ceph_pool_perm *perm;
1996 struct page **pages;
1998 int err = 0, err2 = 0, have = 0;
2000 down_read(&mdsc->pool_perm_rwsem);
2001 p = &mdsc->pool_perm_tree.rb_node;
2003 perm = rb_entry(*p, struct ceph_pool_perm, node);
2004 if (pool < perm->pool)
2006 else if (pool > perm->pool)
2007 p = &(*p)->rb_right;
2009 int ret = ceph_compare_string(pool_ns,
2015 p = &(*p)->rb_right;
2022 up_read(&mdsc->pool_perm_rwsem);
2027 doutc(cl, "pool %lld ns %.*s no perm cached\n", pool,
2028 (int)pool_ns->len, pool_ns->str);
2030 doutc(cl, "pool %lld no perm cached\n", pool);
2032 down_write(&mdsc->pool_perm_rwsem);
2033 p = &mdsc->pool_perm_tree.rb_node;
2037 perm = rb_entry(parent, struct ceph_pool_perm, node);
2038 if (pool < perm->pool)
2040 else if (pool > perm->pool)
2041 p = &(*p)->rb_right;
2043 int ret = ceph_compare_string(pool_ns,
2049 p = &(*p)->rb_right;
2057 up_write(&mdsc->pool_perm_rwsem);
2061 rd_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL,
2062 1, false, GFP_NOFS);
2068 rd_req->r_flags = CEPH_OSD_FLAG_READ;
2069 osd_req_op_init(rd_req, 0, CEPH_OSD_OP_STAT, 0);
2070 rd_req->r_base_oloc.pool = pool;
2072 rd_req->r_base_oloc.pool_ns = ceph_get_string(pool_ns);
2073 ceph_oid_printf(&rd_req->r_base_oid, "%llx.00000000", ci->i_vino.ino);
2075 err = ceph_osdc_alloc_messages(rd_req, GFP_NOFS);
2079 wr_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL,
2080 1, false, GFP_NOFS);
2086 wr_req->r_flags = CEPH_OSD_FLAG_WRITE;
2087 osd_req_op_init(wr_req, 0, CEPH_OSD_OP_CREATE, CEPH_OSD_OP_FLAG_EXCL);
2088 ceph_oloc_copy(&wr_req->r_base_oloc, &rd_req->r_base_oloc);
2089 ceph_oid_copy(&wr_req->r_base_oid, &rd_req->r_base_oid);
2091 err = ceph_osdc_alloc_messages(wr_req, GFP_NOFS);
2095 /* one page should be large enough for STAT data */
2096 pages = ceph_alloc_page_vector(1, GFP_KERNEL);
2097 if (IS_ERR(pages)) {
2098 err = PTR_ERR(pages);
2102 osd_req_op_raw_data_in_pages(rd_req, 0, pages, PAGE_SIZE,
2104 ceph_osdc_start_request(&fsc->client->osdc, rd_req);
2106 wr_req->r_mtime = inode_get_mtime(&ci->netfs.inode);
2107 ceph_osdc_start_request(&fsc->client->osdc, wr_req);
2109 err = ceph_osdc_wait_request(&fsc->client->osdc, rd_req);
2110 err2 = ceph_osdc_wait_request(&fsc->client->osdc, wr_req);
2112 if (err >= 0 || err == -ENOENT)
2114 else if (err != -EPERM) {
2115 if (err == -EBLOCKLISTED)
2116 fsc->blocklisted = true;
2120 if (err2 == 0 || err2 == -EEXIST)
2122 else if (err2 != -EPERM) {
2123 if (err2 == -EBLOCKLISTED)
2124 fsc->blocklisted = true;
2129 pool_ns_len = pool_ns ? pool_ns->len : 0;
2130 perm = kmalloc(sizeof(*perm) + pool_ns_len + 1, GFP_NOFS);
2138 perm->pool_ns_len = pool_ns_len;
2139 if (pool_ns_len > 0)
2140 memcpy(perm->pool_ns, pool_ns->str, pool_ns_len);
2141 perm->pool_ns[pool_ns_len] = 0;
2143 rb_link_node(&perm->node, parent, p);
2144 rb_insert_color(&perm->node, &mdsc->pool_perm_tree);
2147 up_write(&mdsc->pool_perm_rwsem);
2149 ceph_osdc_put_request(rd_req);
2150 ceph_osdc_put_request(wr_req);
2155 doutc(cl, "pool %lld ns %.*s result = %d\n", pool,
2156 (int)pool_ns->len, pool_ns->str, err);
2158 doutc(cl, "pool %lld result = %d\n", pool, err);
2162 int ceph_pool_perm_check(struct inode *inode, int need)
2164 struct ceph_client *cl = ceph_inode_to_client(inode);
2165 struct ceph_inode_info *ci = ceph_inode(inode);
2166 struct ceph_string *pool_ns;
2170 /* Only need to do this for regular files */
2171 if (!S_ISREG(inode->i_mode))
2174 if (ci->i_vino.snap != CEPH_NOSNAP) {
2176 * Pool permission check needs to write to the first object.
2177 * But for snapshot, head of the first object may have alread
2178 * been deleted. Skip check to avoid creating orphan object.
2183 if (ceph_test_mount_opt(ceph_inode_to_fs_client(inode),
2187 spin_lock(&ci->i_ceph_lock);
2188 flags = ci->i_ceph_flags;
2189 pool = ci->i_layout.pool_id;
2190 spin_unlock(&ci->i_ceph_lock);
2192 if (flags & CEPH_I_POOL_PERM) {
2193 if ((need & CEPH_CAP_FILE_RD) && !(flags & CEPH_I_POOL_RD)) {
2194 doutc(cl, "pool %lld no read perm\n", pool);
2197 if ((need & CEPH_CAP_FILE_WR) && !(flags & CEPH_I_POOL_WR)) {
2198 doutc(cl, "pool %lld no write perm\n", pool);
2204 pool_ns = ceph_try_get_string(ci->i_layout.pool_ns);
2205 ret = __ceph_pool_perm_get(ci, pool, pool_ns);
2206 ceph_put_string(pool_ns);
2210 flags = CEPH_I_POOL_PERM;
2211 if (ret & POOL_READ)
2212 flags |= CEPH_I_POOL_RD;
2213 if (ret & POOL_WRITE)
2214 flags |= CEPH_I_POOL_WR;
2216 spin_lock(&ci->i_ceph_lock);
2217 if (pool == ci->i_layout.pool_id &&
2218 pool_ns == rcu_dereference_raw(ci->i_layout.pool_ns)) {
2219 ci->i_ceph_flags |= flags;
2221 pool = ci->i_layout.pool_id;
2222 flags = ci->i_ceph_flags;
2224 spin_unlock(&ci->i_ceph_lock);
2228 void ceph_pool_perm_destroy(struct ceph_mds_client *mdsc)
2230 struct ceph_pool_perm *perm;
2233 while (!RB_EMPTY_ROOT(&mdsc->pool_perm_tree)) {
2234 n = rb_first(&mdsc->pool_perm_tree);
2235 perm = rb_entry(n, struct ceph_pool_perm, node);
2236 rb_erase(n, &mdsc->pool_perm_tree);