1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/ceph/ceph_debug.h>
4 #include <linux/backing-dev.h>
7 #include <linux/pagemap.h>
8 #include <linux/writeback.h> /* generic_writepages */
9 #include <linux/slab.h>
10 #include <linux/pagevec.h>
11 #include <linux/task_io_accounting_ops.h>
12 #include <linux/signal.h>
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 page *page, 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 int ceph_set_page_dirty(struct page *page)
81 struct address_space *mapping = page->mapping;
83 struct ceph_inode_info *ci;
84 struct ceph_snap_context *snapc;
86 if (PageDirty(page)) {
87 dout("%p set_page_dirty %p idx %lu -- already dirty\n",
88 mapping->host, page, page->index);
89 BUG_ON(!PagePrivate(page));
93 inode = mapping->host;
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 dout("%p set_page_dirty %p idx %lu head %d/%d -> %d/%d "
115 "snapc %p seq %lld (%d snaps)\n",
116 mapping->host, page, page->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 page->private. Also set
124 * PagePrivate so that we get invalidatepage callback.
126 BUG_ON(PagePrivate(page));
127 attach_page_private(page, snapc);
129 return __set_page_dirty_nobuffers(page);
133 * If we are truncating the full page (i.e. offset == 0), adjust the
134 * dirty page counters appropriately. Only called if there is private
137 static void ceph_invalidatepage(struct page *page, unsigned int offset,
141 struct ceph_inode_info *ci;
142 struct ceph_snap_context *snapc;
144 wait_on_page_fscache(page);
146 inode = page->mapping->host;
147 ci = ceph_inode(inode);
149 if (offset != 0 || length != thp_size(page)) {
150 dout("%p invalidatepage %p idx %lu partial dirty page %u~%u\n",
151 inode, page, page->index, offset, length);
155 WARN_ON(!PageLocked(page));
156 if (!PagePrivate(page))
159 dout("%p invalidatepage %p idx %lu full dirty page\n",
160 inode, page, page->index);
162 snapc = detach_page_private(page);
163 ceph_put_wrbuffer_cap_refs(ci, 1, snapc);
164 ceph_put_snap_context(snapc);
167 static int ceph_releasepage(struct page *page, gfp_t gfp)
169 dout("%p releasepage %p idx %lu (%sdirty)\n", page->mapping->host,
170 page, page->index, PageDirty(page) ? "" : "not ");
172 if (PageFsCache(page)) {
173 if (!(gfp & __GFP_DIRECT_RECLAIM) || !(gfp & __GFP_FS))
175 wait_on_page_fscache(page);
177 return !PagePrivate(page);
180 static void ceph_netfs_expand_readahead(struct netfs_read_request *rreq)
182 struct inode *inode = rreq->mapping->host;
183 struct ceph_inode_info *ci = ceph_inode(inode);
184 struct ceph_file_layout *lo = &ci->i_layout;
188 /* Expand the start downward */
189 blockno = div_u64_rem(rreq->start, lo->stripe_unit, &blockoff);
190 rreq->start = blockno * lo->stripe_unit;
191 rreq->len += blockoff;
193 /* Now, round up the length to the next block */
194 rreq->len = roundup(rreq->len, lo->stripe_unit);
197 static bool ceph_netfs_clamp_length(struct netfs_read_subrequest *subreq)
199 struct inode *inode = subreq->rreq->mapping->host;
200 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
201 struct ceph_inode_info *ci = ceph_inode(inode);
205 /* Truncate the extent at the end of the current block */
206 ceph_calc_file_object_mapping(&ci->i_layout, subreq->start, subreq->len,
207 &objno, &objoff, &xlen);
208 subreq->len = min(xlen, fsc->mount_options->rsize);
212 static void finish_netfs_read(struct ceph_osd_request *req)
214 struct ceph_fs_client *fsc = ceph_inode_to_client(req->r_inode);
215 struct ceph_osd_data *osd_data = osd_req_op_extent_osd_data(req, 0);
216 struct netfs_read_subrequest *subreq = req->r_priv;
218 int err = req->r_result;
220 ceph_update_read_metrics(&fsc->mdsc->metric, req->r_start_latency,
221 req->r_end_latency, err);
223 dout("%s: result %d subreq->len=%zu i_size=%lld\n", __func__, req->r_result,
224 subreq->len, i_size_read(req->r_inode));
226 /* no object means success but no data */
229 else if (err == -EBLOCKLISTED)
230 fsc->blocklisted = true;
232 if (err >= 0 && err < subreq->len)
233 __set_bit(NETFS_SREQ_CLEAR_TAIL, &subreq->flags);
235 netfs_subreq_terminated(subreq, err, true);
237 num_pages = calc_pages_for(osd_data->alignment, osd_data->length);
238 ceph_put_page_vector(osd_data->pages, num_pages, false);
242 static void ceph_netfs_issue_op(struct netfs_read_subrequest *subreq)
244 struct netfs_read_request *rreq = subreq->rreq;
245 struct inode *inode = rreq->mapping->host;
246 struct ceph_inode_info *ci = ceph_inode(inode);
247 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
248 struct ceph_osd_request *req;
249 struct ceph_vino vino = ceph_vino(inode);
250 struct iov_iter iter;
254 u64 len = subreq->len;
256 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, vino, subreq->start, &len,
257 0, 1, CEPH_OSD_OP_READ,
258 CEPH_OSD_FLAG_READ | fsc->client->osdc.client->options->read_from_replica,
259 NULL, ci->i_truncate_seq, ci->i_truncate_size, false);
266 dout("%s: pos=%llu orig_len=%zu len=%llu\n", __func__, subreq->start, subreq->len, len);
267 iov_iter_xarray(&iter, READ, &rreq->mapping->i_pages, subreq->start, len);
268 err = iov_iter_get_pages_alloc(&iter, &pages, len, &page_off);
270 dout("%s: iov_ter_get_pages_alloc returned %d\n", __func__, err);
274 /* should always give us a page-aligned read */
275 WARN_ON_ONCE(page_off);
278 osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0, false, false);
279 req->r_callback = finish_netfs_read;
280 req->r_priv = subreq;
281 req->r_inode = inode;
284 err = ceph_osdc_start_request(req->r_osdc, req, false);
288 ceph_osdc_put_request(req);
290 netfs_subreq_terminated(subreq, err, false);
291 dout("%s: result %d\n", __func__, err);
294 static void ceph_init_rreq(struct netfs_read_request *rreq, struct file *file)
298 static void ceph_readahead_cleanup(struct address_space *mapping, void *priv)
300 struct inode *inode = mapping->host;
301 struct ceph_inode_info *ci = ceph_inode(inode);
302 int got = (uintptr_t)priv;
305 ceph_put_cap_refs(ci, got);
308 const struct netfs_read_request_ops ceph_netfs_read_ops = {
309 .init_rreq = ceph_init_rreq,
310 .is_cache_enabled = ceph_is_cache_enabled,
311 .begin_cache_operation = ceph_begin_cache_operation,
312 .issue_op = ceph_netfs_issue_op,
313 .expand_readahead = ceph_netfs_expand_readahead,
314 .clamp_length = ceph_netfs_clamp_length,
315 .check_write_begin = ceph_netfs_check_write_begin,
316 .cleanup = ceph_readahead_cleanup,
319 /* read a single page, without unlocking it. */
320 static int ceph_readpage(struct file *file, struct page *page)
322 struct inode *inode = file_inode(file);
323 struct ceph_inode_info *ci = ceph_inode(inode);
324 struct ceph_vino vino = ceph_vino(inode);
325 u64 off = page_offset(page);
326 u64 len = thp_size(page);
328 if (ci->i_inline_version != CEPH_INLINE_NONE) {
330 * Uptodate inline data should have been added
331 * into page cache while getting Fcr caps.
337 zero_user_segment(page, 0, thp_size(page));
338 SetPageUptodate(page);
343 dout("readpage ino %llx.%llx file %p off %llu len %llu page %p index %lu\n",
344 vino.ino, vino.snap, file, off, len, page, page->index);
346 return netfs_readpage(file, page, &ceph_netfs_read_ops, NULL);
349 static void ceph_readahead(struct readahead_control *ractl)
351 struct inode *inode = file_inode(ractl->file);
352 struct ceph_file_info *fi = ractl->file->private_data;
353 struct ceph_rw_context *rw_ctx;
357 if (ceph_inode(inode)->i_inline_version != CEPH_INLINE_NONE)
360 rw_ctx = ceph_find_rw_context(fi);
363 * readahead callers do not necessarily hold Fcb caps
364 * (e.g. fadvise, madvise).
366 int want = CEPH_CAP_FILE_CACHE;
368 ret = ceph_try_get_caps(inode, CEPH_CAP_FILE_RD, want, true, &got);
370 dout("start_read %p, error getting cap\n", inode);
371 else if (!(got & want))
372 dout("start_read %p, no cache cap\n", inode);
377 netfs_readahead(ractl, &ceph_netfs_read_ops, (void *)(uintptr_t)got);
380 struct ceph_writeback_ctl
390 * Get ref for the oldest snapc for an inode with dirty data... that is, the
391 * only snap context we are allowed to write back.
393 static struct ceph_snap_context *
394 get_oldest_context(struct inode *inode, struct ceph_writeback_ctl *ctl,
395 struct ceph_snap_context *page_snapc)
397 struct ceph_inode_info *ci = ceph_inode(inode);
398 struct ceph_snap_context *snapc = NULL;
399 struct ceph_cap_snap *capsnap = NULL;
401 spin_lock(&ci->i_ceph_lock);
402 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
403 dout(" cap_snap %p snapc %p has %d dirty pages\n", capsnap,
404 capsnap->context, capsnap->dirty_pages);
405 if (!capsnap->dirty_pages)
408 /* get i_size, truncate_{seq,size} for page_snapc? */
409 if (snapc && capsnap->context != page_snapc)
413 if (capsnap->writing) {
414 ctl->i_size = i_size_read(inode);
415 ctl->size_stable = false;
417 ctl->i_size = capsnap->size;
418 ctl->size_stable = true;
420 ctl->truncate_size = capsnap->truncate_size;
421 ctl->truncate_seq = capsnap->truncate_seq;
422 ctl->head_snapc = false;
428 snapc = ceph_get_snap_context(capsnap->context);
430 page_snapc == snapc ||
431 page_snapc->seq > snapc->seq)
434 if (!snapc && ci->i_wrbuffer_ref_head) {
435 snapc = ceph_get_snap_context(ci->i_head_snapc);
436 dout(" head snapc %p has %d dirty pages\n",
437 snapc, ci->i_wrbuffer_ref_head);
439 ctl->i_size = i_size_read(inode);
440 ctl->truncate_size = ci->i_truncate_size;
441 ctl->truncate_seq = ci->i_truncate_seq;
442 ctl->size_stable = false;
443 ctl->head_snapc = true;
446 spin_unlock(&ci->i_ceph_lock);
450 static u64 get_writepages_data_length(struct inode *inode,
451 struct page *page, u64 start)
453 struct ceph_inode_info *ci = ceph_inode(inode);
454 struct ceph_snap_context *snapc = page_snap_context(page);
455 struct ceph_cap_snap *capsnap = NULL;
456 u64 end = i_size_read(inode);
458 if (snapc != ci->i_head_snapc) {
460 spin_lock(&ci->i_ceph_lock);
461 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
462 if (capsnap->context == snapc) {
463 if (!capsnap->writing)
469 spin_unlock(&ci->i_ceph_lock);
472 if (end > page_offset(page) + thp_size(page))
473 end = page_offset(page) + thp_size(page);
474 return end > start ? end - start : 0;
478 * Write a single page, but leave the page locked.
480 * If we get a write error, mark the mapping for error, but still adjust the
481 * dirty page accounting (i.e., page is no longer dirty).
483 static int writepage_nounlock(struct page *page, struct writeback_control *wbc)
485 struct inode *inode = page->mapping->host;
486 struct ceph_inode_info *ci = ceph_inode(inode);
487 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
488 struct ceph_snap_context *snapc, *oldest;
489 loff_t page_off = page_offset(page);
491 loff_t len = thp_size(page);
492 struct ceph_writeback_ctl ceph_wbc;
493 struct ceph_osd_client *osdc = &fsc->client->osdc;
494 struct ceph_osd_request *req;
496 dout("writepage %p idx %lu\n", page, page->index);
498 /* verify this is a writeable snap context */
499 snapc = page_snap_context(page);
501 dout("writepage %p page %p not dirty?\n", inode, page);
504 oldest = get_oldest_context(inode, &ceph_wbc, snapc);
505 if (snapc->seq > oldest->seq) {
506 dout("writepage %p page %p snapc %p not writeable - noop\n",
508 /* we should only noop if called by kswapd */
509 WARN_ON(!(current->flags & PF_MEMALLOC));
510 ceph_put_snap_context(oldest);
511 redirty_page_for_writepage(wbc, page);
514 ceph_put_snap_context(oldest);
516 /* is this a partial page at end of file? */
517 if (page_off >= ceph_wbc.i_size) {
518 dout("%p page eof %llu\n", page, ceph_wbc.i_size);
519 page->mapping->a_ops->invalidatepage(page, 0, thp_size(page));
523 if (ceph_wbc.i_size < page_off + len)
524 len = ceph_wbc.i_size - page_off;
526 dout("writepage %p page %p index %lu on %llu~%llu snapc %p seq %lld\n",
527 inode, page, page->index, page_off, len, snapc, snapc->seq);
529 if (atomic_long_inc_return(&fsc->writeback_count) >
530 CONGESTION_ON_THRESH(fsc->mount_options->congestion_kb))
531 set_bdi_congested(inode_to_bdi(inode), BLK_RW_ASYNC);
533 set_page_writeback(page);
534 req = ceph_osdc_new_request(osdc, &ci->i_layout, ceph_vino(inode), page_off, &len, 0, 1,
535 CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE, snapc,
536 ceph_wbc.truncate_seq, ceph_wbc.truncate_size,
539 redirty_page_for_writepage(wbc, page);
540 end_page_writeback(page);
544 /* it may be a short write due to an object boundary */
545 WARN_ON_ONCE(len > thp_size(page));
546 osd_req_op_extent_osd_data_pages(req, 0, &page, len, 0, false, false);
547 dout("writepage %llu~%llu (%llu bytes)\n", page_off, len, len);
549 req->r_mtime = inode->i_mtime;
550 err = ceph_osdc_start_request(osdc, req, true);
552 err = ceph_osdc_wait_request(osdc, req);
554 ceph_update_write_metrics(&fsc->mdsc->metric, req->r_start_latency,
555 req->r_end_latency, err);
557 ceph_osdc_put_request(req);
562 struct writeback_control tmp_wbc;
565 if (err == -ERESTARTSYS) {
566 /* killed by SIGKILL */
567 dout("writepage interrupted page %p\n", page);
568 redirty_page_for_writepage(wbc, page);
569 end_page_writeback(page);
572 if (err == -EBLOCKLISTED)
573 fsc->blocklisted = true;
574 dout("writepage setting page/mapping error %d %p\n",
576 mapping_set_error(&inode->i_data, err);
577 wbc->pages_skipped++;
579 dout("writepage cleaned page %p\n", page);
580 err = 0; /* vfs expects us to return 0 */
582 oldest = detach_page_private(page);
583 WARN_ON_ONCE(oldest != snapc);
584 end_page_writeback(page);
585 ceph_put_wrbuffer_cap_refs(ci, 1, snapc);
586 ceph_put_snap_context(snapc); /* page's reference */
588 if (atomic_long_dec_return(&fsc->writeback_count) <
589 CONGESTION_OFF_THRESH(fsc->mount_options->congestion_kb))
590 clear_bdi_congested(inode_to_bdi(inode), BLK_RW_ASYNC);
595 static int ceph_writepage(struct page *page, struct writeback_control *wbc)
598 struct inode *inode = page->mapping->host;
601 err = writepage_nounlock(page, wbc);
602 if (err == -ERESTARTSYS) {
603 /* direct memory reclaimer was killed by SIGKILL. return 0
604 * to prevent caller from setting mapping/page error */
613 * async writeback completion handler.
615 * If we get an error, set the mapping error bit, but not the individual
618 static void writepages_finish(struct ceph_osd_request *req)
620 struct inode *inode = req->r_inode;
621 struct ceph_inode_info *ci = ceph_inode(inode);
622 struct ceph_osd_data *osd_data;
624 int num_pages, total_pages = 0;
626 int rc = req->r_result;
627 struct ceph_snap_context *snapc = req->r_snapc;
628 struct address_space *mapping = inode->i_mapping;
629 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
632 dout("writepages_finish %p rc %d\n", inode, rc);
634 mapping_set_error(mapping, rc);
635 ceph_set_error_write(ci);
636 if (rc == -EBLOCKLISTED)
637 fsc->blocklisted = true;
639 ceph_clear_error_write(ci);
642 ceph_update_write_metrics(&fsc->mdsc->metric, req->r_start_latency,
643 req->r_end_latency, rc);
646 * We lost the cache cap, need to truncate the page before
647 * it is unlocked, otherwise we'd truncate it later in the
648 * page truncation thread, possibly losing some data that
651 remove_page = !(ceph_caps_issued(ci) &
652 (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO));
654 /* clean all pages */
655 for (i = 0; i < req->r_num_ops; i++) {
656 if (req->r_ops[i].op != CEPH_OSD_OP_WRITE)
659 osd_data = osd_req_op_extent_osd_data(req, i);
660 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES);
661 num_pages = calc_pages_for((u64)osd_data->alignment,
662 (u64)osd_data->length);
663 total_pages += num_pages;
664 for (j = 0; j < num_pages; j++) {
665 page = osd_data->pages[j];
667 WARN_ON(!PageUptodate(page));
669 if (atomic_long_dec_return(&fsc->writeback_count) <
670 CONGESTION_OFF_THRESH(
671 fsc->mount_options->congestion_kb))
672 clear_bdi_congested(inode_to_bdi(inode),
675 ceph_put_snap_context(detach_page_private(page));
676 end_page_writeback(page);
677 dout("unlocking %p\n", page);
680 generic_error_remove_page(inode->i_mapping,
685 dout("writepages_finish %p wrote %llu bytes cleaned %d pages\n",
686 inode, osd_data->length, rc >= 0 ? num_pages : 0);
688 release_pages(osd_data->pages, num_pages);
691 ceph_put_wrbuffer_cap_refs(ci, total_pages, snapc);
693 osd_data = osd_req_op_extent_osd_data(req, 0);
694 if (osd_data->pages_from_pool)
695 mempool_free(osd_data->pages, ceph_wb_pagevec_pool);
697 kfree(osd_data->pages);
698 ceph_osdc_put_request(req);
702 * initiate async writeback
704 static int ceph_writepages_start(struct address_space *mapping,
705 struct writeback_control *wbc)
707 struct inode *inode = mapping->host;
708 struct ceph_inode_info *ci = ceph_inode(inode);
709 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
710 struct ceph_vino vino = ceph_vino(inode);
711 pgoff_t index, start_index, end = -1;
712 struct ceph_snap_context *snapc = NULL, *last_snapc = NULL, *pgsnapc;
715 unsigned int wsize = i_blocksize(inode);
716 struct ceph_osd_request *req = NULL;
717 struct ceph_writeback_ctl ceph_wbc;
718 bool should_loop, range_whole = false;
721 dout("writepages_start %p (mode=%s)\n", inode,
722 wbc->sync_mode == WB_SYNC_NONE ? "NONE" :
723 (wbc->sync_mode == WB_SYNC_ALL ? "ALL" : "HOLD"));
725 if (READ_ONCE(fsc->mount_state) >= CEPH_MOUNT_SHUTDOWN) {
726 if (ci->i_wrbuffer_ref > 0) {
728 "writepage_start %p %lld forced umount\n",
729 inode, ceph_ino(inode));
731 mapping_set_error(mapping, -EIO);
732 return -EIO; /* we're in a forced umount, don't write! */
734 if (fsc->mount_options->wsize < wsize)
735 wsize = fsc->mount_options->wsize;
739 start_index = wbc->range_cyclic ? mapping->writeback_index : 0;
743 /* find oldest snap context with dirty data */
744 snapc = get_oldest_context(inode, &ceph_wbc, NULL);
746 /* hmm, why does writepages get called when there
748 dout(" no snap context with dirty data?\n");
751 dout(" oldest snapc is %p seq %lld (%d snaps)\n",
752 snapc, snapc->seq, snapc->num_snaps);
755 if (ceph_wbc.head_snapc && snapc != last_snapc) {
756 /* where to start/end? */
757 if (wbc->range_cyclic) {
762 dout(" cyclic, start at %lu\n", index);
764 index = wbc->range_start >> PAGE_SHIFT;
765 end = wbc->range_end >> PAGE_SHIFT;
766 if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
768 dout(" not cyclic, %lu to %lu\n", index, end);
770 } else if (!ceph_wbc.head_snapc) {
771 /* Do not respect wbc->range_{start,end}. Dirty pages
772 * in that range can be associated with newer snapc.
773 * They are not writeable until we write all dirty pages
774 * associated with 'snapc' get written */
777 dout(" non-head snapc, range whole\n");
780 ceph_put_snap_context(last_snapc);
783 while (!done && index <= end) {
784 int num_ops = 0, op_idx;
785 unsigned i, pvec_pages, max_pages, locked_pages = 0;
786 struct page **pages = NULL, **data_pages;
788 pgoff_t strip_unit_end = 0;
789 u64 offset = 0, len = 0;
790 bool from_pool = false;
792 max_pages = wsize >> PAGE_SHIFT;
795 pvec_pages = pagevec_lookup_range_tag(&pvec, mapping, &index,
796 end, PAGECACHE_TAG_DIRTY);
797 dout("pagevec_lookup_range_tag got %d\n", pvec_pages);
798 if (!pvec_pages && !locked_pages)
800 for (i = 0; i < pvec_pages && locked_pages < max_pages; i++) {
801 page = pvec.pages[i];
802 dout("? %p idx %lu\n", page, page->index);
803 if (locked_pages == 0)
804 lock_page(page); /* first page */
805 else if (!trylock_page(page))
808 /* only dirty pages, or our accounting breaks */
809 if (unlikely(!PageDirty(page)) ||
810 unlikely(page->mapping != mapping)) {
811 dout("!dirty or !mapping %p\n", page);
815 /* only if matching snap context */
816 pgsnapc = page_snap_context(page);
817 if (pgsnapc != snapc) {
818 dout("page snapc %p %lld != oldest %p %lld\n",
819 pgsnapc, pgsnapc->seq, snapc, snapc->seq);
821 !ceph_wbc.head_snapc &&
822 wbc->sync_mode != WB_SYNC_NONE)
827 if (page_offset(page) >= ceph_wbc.i_size) {
828 dout("%p page eof %llu\n",
829 page, ceph_wbc.i_size);
830 if ((ceph_wbc.size_stable ||
831 page_offset(page) >= i_size_read(inode)) &&
832 clear_page_dirty_for_io(page))
833 mapping->a_ops->invalidatepage(page,
838 if (strip_unit_end && (page->index > strip_unit_end)) {
839 dout("end of strip unit %p\n", page);
843 if (PageWriteback(page)) {
844 if (wbc->sync_mode == WB_SYNC_NONE) {
845 dout("%p under writeback\n", page);
849 dout("waiting on writeback %p\n", page);
850 wait_on_page_writeback(page);
853 if (!clear_page_dirty_for_io(page)) {
854 dout("%p !clear_page_dirty_for_io\n", page);
860 * We have something to write. If this is
861 * the first locked page this time through,
862 * calculate max possinle write size and
863 * allocate a page array
865 if (locked_pages == 0) {
870 /* prepare async write request */
871 offset = (u64)page_offset(page);
872 ceph_calc_file_object_mapping(&ci->i_layout,
879 strip_unit_end = page->index +
880 ((len - 1) >> PAGE_SHIFT);
883 max_pages = calc_pages_for(0, (u64)len);
884 pages = kmalloc_array(max_pages,
889 pages = mempool_alloc(ceph_wb_pagevec_pool, GFP_NOFS);
894 } else if (page->index !=
895 (offset + len) >> PAGE_SHIFT) {
896 if (num_ops >= (from_pool ? CEPH_OSD_SLAB_OPS :
898 redirty_page_for_writepage(wbc, page);
904 offset = (u64)page_offset(page);
908 /* note position of first page in pvec */
909 dout("%p will write page %p idx %lu\n",
910 inode, page, page->index);
912 if (atomic_long_inc_return(&fsc->writeback_count) >
913 CONGESTION_ON_THRESH(
914 fsc->mount_options->congestion_kb)) {
915 set_bdi_congested(inode_to_bdi(inode),
920 pages[locked_pages++] = page;
921 pvec.pages[i] = NULL;
923 len += thp_size(page);
926 /* did we get anything? */
928 goto release_pvec_pages;
931 /* shift unused page to beginning of pvec */
932 for (j = 0; j < pvec_pages; j++) {
936 pvec.pages[n] = pvec.pages[j];
941 if (pvec_pages && i == pvec_pages &&
942 locked_pages < max_pages) {
943 dout("reached end pvec, trying for more\n");
944 pagevec_release(&pvec);
950 offset = page_offset(pages[0]);
953 req = ceph_osdc_new_request(&fsc->client->osdc,
955 offset, &len, 0, num_ops,
956 CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE,
957 snapc, ceph_wbc.truncate_seq,
958 ceph_wbc.truncate_size, false);
960 req = ceph_osdc_new_request(&fsc->client->osdc,
967 snapc, ceph_wbc.truncate_seq,
968 ceph_wbc.truncate_size, true);
971 BUG_ON(len < page_offset(pages[locked_pages - 1]) +
972 thp_size(page) - offset);
974 req->r_callback = writepages_finish;
975 req->r_inode = inode;
977 /* Format the osd request message and submit the write */
981 for (i = 0; i < locked_pages; i++) {
982 u64 cur_offset = page_offset(pages[i]);
983 if (offset + len != cur_offset) {
984 if (op_idx + 1 == req->r_num_ops)
986 osd_req_op_extent_dup_last(req, op_idx,
987 cur_offset - offset);
988 dout("writepages got pages at %llu~%llu\n",
990 osd_req_op_extent_osd_data_pages(req, op_idx,
993 osd_req_op_extent_update(req, op_idx, len);
997 data_pages = pages + i;
1001 set_page_writeback(pages[i]);
1002 len += thp_size(page);
1005 if (ceph_wbc.size_stable) {
1006 len = min(len, ceph_wbc.i_size - offset);
1007 } else if (i == locked_pages) {
1008 /* writepages_finish() clears writeback pages
1009 * according to the data length, so make sure
1010 * data length covers all locked pages */
1011 u64 min_len = len + 1 - thp_size(page);
1012 len = get_writepages_data_length(inode, pages[i - 1],
1014 len = max(len, min_len);
1016 dout("writepages got pages at %llu~%llu\n", offset, len);
1018 osd_req_op_extent_osd_data_pages(req, op_idx, data_pages, len,
1019 0, from_pool, false);
1020 osd_req_op_extent_update(req, op_idx, len);
1022 BUG_ON(op_idx + 1 != req->r_num_ops);
1025 if (i < locked_pages) {
1026 BUG_ON(num_ops <= req->r_num_ops);
1027 num_ops -= req->r_num_ops;
1030 /* allocate new pages array for next request */
1032 pages = kmalloc_array(locked_pages, sizeof(*pages),
1036 pages = mempool_alloc(ceph_wb_pagevec_pool, GFP_NOFS);
1039 memcpy(pages, data_pages + i,
1040 locked_pages * sizeof(*pages));
1041 memset(data_pages + i, 0,
1042 locked_pages * sizeof(*pages));
1044 BUG_ON(num_ops != req->r_num_ops);
1045 index = pages[i - 1]->index + 1;
1046 /* request message now owns the pages array */
1050 req->r_mtime = inode->i_mtime;
1051 rc = ceph_osdc_start_request(&fsc->client->osdc, req, true);
1055 wbc->nr_to_write -= i;
1060 * We stop writing back only if we are not doing
1061 * integrity sync. In case of integrity sync we have to
1062 * keep going until we have written all the pages
1063 * we tagged for writeback prior to entering this loop.
1065 if (wbc->nr_to_write <= 0 && wbc->sync_mode == WB_SYNC_NONE)
1069 dout("pagevec_release on %d pages (%p)\n", (int)pvec.nr,
1070 pvec.nr ? pvec.pages[0] : NULL);
1071 pagevec_release(&pvec);
1074 if (should_loop && !done) {
1075 /* more to do; loop back to beginning of file */
1076 dout("writepages looping back to beginning of file\n");
1077 end = start_index - 1; /* OK even when start_index == 0 */
1079 /* to write dirty pages associated with next snapc,
1080 * we need to wait until current writes complete */
1081 if (wbc->sync_mode != WB_SYNC_NONE &&
1082 start_index == 0 && /* all dirty pages were checked */
1083 !ceph_wbc.head_snapc) {
1087 while ((index <= end) &&
1088 (nr = pagevec_lookup_tag(&pvec, mapping, &index,
1089 PAGECACHE_TAG_WRITEBACK))) {
1090 for (i = 0; i < nr; i++) {
1091 page = pvec.pages[i];
1092 if (page_snap_context(page) != snapc)
1094 wait_on_page_writeback(page);
1096 pagevec_release(&pvec);
1106 if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
1107 mapping->writeback_index = index;
1110 ceph_osdc_put_request(req);
1111 ceph_put_snap_context(last_snapc);
1112 dout("writepages dend - startone, rc = %d\n", rc);
1119 * See if a given @snapc is either writeable, or already written.
1121 static int context_is_writeable_or_written(struct inode *inode,
1122 struct ceph_snap_context *snapc)
1124 struct ceph_snap_context *oldest = get_oldest_context(inode, NULL, NULL);
1125 int ret = !oldest || snapc->seq <= oldest->seq;
1127 ceph_put_snap_context(oldest);
1132 * ceph_find_incompatible - find an incompatible context and return it
1133 * @page: page being dirtied
1135 * We are only allowed to write into/dirty a page if the page is
1136 * clean, or already dirty within the same snap context. Returns a
1137 * conflicting context if there is one, NULL if there isn't, or a
1138 * negative error code on other errors.
1140 * Must be called with page lock held.
1142 static struct ceph_snap_context *
1143 ceph_find_incompatible(struct page *page)
1145 struct inode *inode = page->mapping->host;
1146 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1147 struct ceph_inode_info *ci = ceph_inode(inode);
1149 if (READ_ONCE(fsc->mount_state) >= CEPH_MOUNT_SHUTDOWN) {
1150 dout(" page %p forced umount\n", page);
1151 return ERR_PTR(-EIO);
1155 struct ceph_snap_context *snapc, *oldest;
1157 wait_on_page_writeback(page);
1159 snapc = page_snap_context(page);
1160 if (!snapc || snapc == ci->i_head_snapc)
1164 * this page is already dirty in another (older) snap
1165 * context! is it writeable now?
1167 oldest = get_oldest_context(inode, NULL, NULL);
1168 if (snapc->seq > oldest->seq) {
1169 /* not writeable -- return it for the caller to deal with */
1170 ceph_put_snap_context(oldest);
1171 dout(" page %p snapc %p not current or oldest\n", page, snapc);
1172 return ceph_get_snap_context(snapc);
1174 ceph_put_snap_context(oldest);
1176 /* yay, writeable, do it now (without dropping page lock) */
1177 dout(" page %p snapc %p not current, but oldest\n", page, snapc);
1178 if (clear_page_dirty_for_io(page)) {
1179 int r = writepage_nounlock(page, NULL);
1187 static int ceph_netfs_check_write_begin(struct file *file, loff_t pos, unsigned int len,
1188 struct page *page, void **_fsdata)
1190 struct inode *inode = file_inode(file);
1191 struct ceph_inode_info *ci = ceph_inode(inode);
1192 struct ceph_snap_context *snapc;
1194 snapc = ceph_find_incompatible(page);
1201 return PTR_ERR(snapc);
1203 ceph_queue_writeback(inode);
1204 r = wait_event_killable(ci->i_cap_wq,
1205 context_is_writeable_or_written(inode, snapc));
1206 ceph_put_snap_context(snapc);
1207 return r == 0 ? -EAGAIN : r;
1213 * We are only allowed to write into/dirty the page if the page is
1214 * clean, or already dirty within the same snap context.
1216 static int ceph_write_begin(struct file *file, struct address_space *mapping,
1217 loff_t pos, unsigned len, unsigned flags,
1218 struct page **pagep, void **fsdata)
1220 struct inode *inode = file_inode(file);
1221 struct ceph_inode_info *ci = ceph_inode(inode);
1222 struct page *page = NULL;
1223 pgoff_t index = pos >> PAGE_SHIFT;
1227 * Uninlining should have already been done and everything updated, EXCEPT
1228 * for inline_version sent to the MDS.
1230 if (ci->i_inline_version != CEPH_INLINE_NONE) {
1231 page = grab_cache_page_write_begin(mapping, index, flags);
1236 * The inline_version on a new inode is set to 1. If that's the
1237 * case, then the page is brand new and isn't yet Uptodate.
1240 if (index == 0 && ci->i_inline_version != 1) {
1241 if (!PageUptodate(page)) {
1242 WARN_ONCE(1, "ceph: write_begin called on still-inlined inode (inline_version %llu)!\n",
1243 ci->i_inline_version);
1248 zero_user_segment(page, 0, thp_size(page));
1249 SetPageUptodate(page);
1253 r = netfs_write_begin(file, inode->i_mapping, pos, len, 0, &page, NULL,
1254 &ceph_netfs_read_ops, NULL);
1257 wait_on_page_fscache(page);
1262 WARN_ON_ONCE(!PageLocked(page));
1269 * we don't do anything in here that simple_write_end doesn't do
1270 * except adjust dirty page accounting
1272 static int ceph_write_end(struct file *file, struct address_space *mapping,
1273 loff_t pos, unsigned len, unsigned copied,
1274 struct page *page, void *fsdata)
1276 struct inode *inode = file_inode(file);
1277 bool check_cap = false;
1279 dout("write_end file %p inode %p page %p %d~%d (%d)\n", file,
1280 inode, page, (int)pos, (int)copied, (int)len);
1282 /* zero the stale part of the page if we did a short copy */
1283 if (!PageUptodate(page)) {
1288 SetPageUptodate(page);
1291 /* did file size increase? */
1292 if (pos+copied > i_size_read(inode))
1293 check_cap = ceph_inode_set_size(inode, pos+copied);
1295 set_page_dirty(page);
1302 ceph_check_caps(ceph_inode(inode), CHECK_CAPS_AUTHONLY, NULL);
1308 * we set .direct_IO to indicate direct io is supported, but since we
1309 * intercept O_DIRECT reads and writes early, this function should
1312 static ssize_t ceph_direct_io(struct kiocb *iocb, struct iov_iter *iter)
1318 const struct address_space_operations ceph_aops = {
1319 .readpage = ceph_readpage,
1320 .readahead = ceph_readahead,
1321 .writepage = ceph_writepage,
1322 .writepages = ceph_writepages_start,
1323 .write_begin = ceph_write_begin,
1324 .write_end = ceph_write_end,
1325 .set_page_dirty = ceph_set_page_dirty,
1326 .invalidatepage = ceph_invalidatepage,
1327 .releasepage = ceph_releasepage,
1328 .direct_IO = ceph_direct_io,
1331 static void ceph_block_sigs(sigset_t *oldset)
1334 siginitsetinv(&mask, sigmask(SIGKILL));
1335 sigprocmask(SIG_BLOCK, &mask, oldset);
1338 static void ceph_restore_sigs(sigset_t *oldset)
1340 sigprocmask(SIG_SETMASK, oldset, NULL);
1346 static vm_fault_t ceph_filemap_fault(struct vm_fault *vmf)
1348 struct vm_area_struct *vma = vmf->vma;
1349 struct inode *inode = file_inode(vma->vm_file);
1350 struct ceph_inode_info *ci = ceph_inode(inode);
1351 struct ceph_file_info *fi = vma->vm_file->private_data;
1352 loff_t off = (loff_t)vmf->pgoff << PAGE_SHIFT;
1355 vm_fault_t ret = VM_FAULT_SIGBUS;
1357 ceph_block_sigs(&oldset);
1359 dout("filemap_fault %p %llx.%llx %llu trying to get caps\n",
1360 inode, ceph_vinop(inode), off);
1361 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1362 want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
1364 want = CEPH_CAP_FILE_CACHE;
1367 err = ceph_get_caps(vma->vm_file, CEPH_CAP_FILE_RD, want, -1, &got);
1371 dout("filemap_fault %p %llu got cap refs on %s\n",
1372 inode, off, ceph_cap_string(got));
1374 if ((got & (CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO)) ||
1375 ci->i_inline_version == CEPH_INLINE_NONE) {
1376 CEPH_DEFINE_RW_CONTEXT(rw_ctx, got);
1377 ceph_add_rw_context(fi, &rw_ctx);
1378 ret = filemap_fault(vmf);
1379 ceph_del_rw_context(fi, &rw_ctx);
1380 dout("filemap_fault %p %llu drop cap refs %s ret %x\n",
1381 inode, off, ceph_cap_string(got), ret);
1385 ceph_put_cap_refs(ci, got);
1390 /* read inline data */
1391 if (off >= PAGE_SIZE) {
1392 /* does not support inline data > PAGE_SIZE */
1393 ret = VM_FAULT_SIGBUS;
1395 struct address_space *mapping = inode->i_mapping;
1396 struct page *page = find_or_create_page(mapping, 0,
1397 mapping_gfp_constraint(mapping,
1403 err = __ceph_do_getattr(inode, page,
1404 CEPH_STAT_CAP_INLINE_DATA, true);
1405 if (err < 0 || off >= i_size_read(inode)) {
1408 ret = vmf_error(err);
1411 if (err < PAGE_SIZE)
1412 zero_user_segment(page, err, PAGE_SIZE);
1414 flush_dcache_page(page);
1415 SetPageUptodate(page);
1417 ret = VM_FAULT_MAJOR | VM_FAULT_LOCKED;
1419 dout("filemap_fault %p %llu read inline data ret %x\n",
1423 ceph_restore_sigs(&oldset);
1425 ret = vmf_error(err);
1430 static vm_fault_t ceph_page_mkwrite(struct vm_fault *vmf)
1432 struct vm_area_struct *vma = vmf->vma;
1433 struct inode *inode = file_inode(vma->vm_file);
1434 struct ceph_inode_info *ci = ceph_inode(inode);
1435 struct ceph_file_info *fi = vma->vm_file->private_data;
1436 struct ceph_cap_flush *prealloc_cf;
1437 struct page *page = vmf->page;
1438 loff_t off = page_offset(page);
1439 loff_t size = i_size_read(inode);
1443 vm_fault_t ret = VM_FAULT_SIGBUS;
1445 prealloc_cf = ceph_alloc_cap_flush();
1447 return VM_FAULT_OOM;
1449 sb_start_pagefault(inode->i_sb);
1450 ceph_block_sigs(&oldset);
1452 if (ci->i_inline_version != CEPH_INLINE_NONE) {
1453 struct page *locked_page = NULL;
1458 err = ceph_uninline_data(vma->vm_file, locked_page);
1460 unlock_page(locked_page);
1465 if (off + thp_size(page) <= size)
1466 len = thp_size(page);
1468 len = offset_in_thp(page, size);
1470 dout("page_mkwrite %p %llx.%llx %llu~%zd getting caps i_size %llu\n",
1471 inode, ceph_vinop(inode), off, len, size);
1472 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1473 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
1475 want = CEPH_CAP_FILE_BUFFER;
1478 err = ceph_get_caps(vma->vm_file, CEPH_CAP_FILE_WR, want, off + len, &got);
1482 dout("page_mkwrite %p %llu~%zd got cap refs on %s\n",
1483 inode, off, len, ceph_cap_string(got));
1485 /* Update time before taking page lock */
1486 file_update_time(vma->vm_file);
1487 inode_inc_iversion_raw(inode);
1490 struct ceph_snap_context *snapc;
1494 if (page_mkwrite_check_truncate(page, inode) < 0) {
1496 ret = VM_FAULT_NOPAGE;
1500 snapc = ceph_find_incompatible(page);
1502 /* success. we'll keep the page locked. */
1503 set_page_dirty(page);
1504 ret = VM_FAULT_LOCKED;
1510 if (IS_ERR(snapc)) {
1511 ret = VM_FAULT_SIGBUS;
1515 ceph_queue_writeback(inode);
1516 err = wait_event_killable(ci->i_cap_wq,
1517 context_is_writeable_or_written(inode, snapc));
1518 ceph_put_snap_context(snapc);
1521 if (ret == VM_FAULT_LOCKED ||
1522 ci->i_inline_version != CEPH_INLINE_NONE) {
1524 spin_lock(&ci->i_ceph_lock);
1525 ci->i_inline_version = CEPH_INLINE_NONE;
1526 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
1528 spin_unlock(&ci->i_ceph_lock);
1530 __mark_inode_dirty(inode, dirty);
1533 dout("page_mkwrite %p %llu~%zd dropping cap refs on %s ret %x\n",
1534 inode, off, len, ceph_cap_string(got), ret);
1535 ceph_put_cap_refs_async(ci, got);
1537 ceph_restore_sigs(&oldset);
1538 sb_end_pagefault(inode->i_sb);
1539 ceph_free_cap_flush(prealloc_cf);
1541 ret = vmf_error(err);
1545 void ceph_fill_inline_data(struct inode *inode, struct page *locked_page,
1546 char *data, size_t len)
1548 struct address_space *mapping = inode->i_mapping;
1554 if (i_size_read(inode) == 0)
1556 page = find_or_create_page(mapping, 0,
1557 mapping_gfp_constraint(mapping,
1561 if (PageUptodate(page)) {
1568 dout("fill_inline_data %p %llx.%llx len %zu locked_page %p\n",
1569 inode, ceph_vinop(inode), len, locked_page);
1572 void *kaddr = kmap_atomic(page);
1573 memcpy(kaddr, data, len);
1574 kunmap_atomic(kaddr);
1577 if (page != locked_page) {
1578 if (len < PAGE_SIZE)
1579 zero_user_segment(page, len, PAGE_SIZE);
1581 flush_dcache_page(page);
1583 SetPageUptodate(page);
1589 int ceph_uninline_data(struct file *filp, struct page *locked_page)
1591 struct inode *inode = file_inode(filp);
1592 struct ceph_inode_info *ci = ceph_inode(inode);
1593 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1594 struct ceph_osd_request *req;
1595 struct page *page = NULL;
1596 u64 len, inline_version;
1598 bool from_pagecache = false;
1600 spin_lock(&ci->i_ceph_lock);
1601 inline_version = ci->i_inline_version;
1602 spin_unlock(&ci->i_ceph_lock);
1604 dout("uninline_data %p %llx.%llx inline_version %llu\n",
1605 inode, ceph_vinop(inode), inline_version);
1607 if (inline_version == 1 || /* initial version, no data */
1608 inline_version == CEPH_INLINE_NONE)
1613 WARN_ON(!PageUptodate(page));
1614 } else if (ceph_caps_issued(ci) &
1615 (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) {
1616 page = find_get_page(inode->i_mapping, 0);
1618 if (PageUptodate(page)) {
1619 from_pagecache = true;
1629 len = i_size_read(inode);
1630 if (len > PAGE_SIZE)
1633 page = __page_cache_alloc(GFP_NOFS);
1638 err = __ceph_do_getattr(inode, page,
1639 CEPH_STAT_CAP_INLINE_DATA, true);
1641 /* no inline data */
1642 if (err == -ENODATA)
1649 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1650 ceph_vino(inode), 0, &len, 0, 1,
1651 CEPH_OSD_OP_CREATE, CEPH_OSD_FLAG_WRITE,
1658 req->r_mtime = inode->i_mtime;
1659 err = ceph_osdc_start_request(&fsc->client->osdc, req, false);
1661 err = ceph_osdc_wait_request(&fsc->client->osdc, req);
1662 ceph_osdc_put_request(req);
1666 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1667 ceph_vino(inode), 0, &len, 1, 3,
1668 CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE,
1669 NULL, ci->i_truncate_seq,
1670 ci->i_truncate_size, false);
1676 osd_req_op_extent_osd_data_pages(req, 1, &page, len, 0, false, false);
1679 __le64 xattr_buf = cpu_to_le64(inline_version);
1680 err = osd_req_op_xattr_init(req, 0, CEPH_OSD_OP_CMPXATTR,
1681 "inline_version", &xattr_buf,
1683 CEPH_OSD_CMPXATTR_OP_GT,
1684 CEPH_OSD_CMPXATTR_MODE_U64);
1691 int xattr_len = snprintf(xattr_buf, sizeof(xattr_buf),
1692 "%llu", inline_version);
1693 err = osd_req_op_xattr_init(req, 2, CEPH_OSD_OP_SETXATTR,
1695 xattr_buf, xattr_len, 0, 0);
1700 req->r_mtime = inode->i_mtime;
1701 err = ceph_osdc_start_request(&fsc->client->osdc, req, false);
1703 err = ceph_osdc_wait_request(&fsc->client->osdc, req);
1705 ceph_update_write_metrics(&fsc->mdsc->metric, req->r_start_latency,
1706 req->r_end_latency, err);
1709 ceph_osdc_put_request(req);
1710 if (err == -ECANCELED)
1713 if (page && page != locked_page) {
1714 if (from_pagecache) {
1718 __free_pages(page, 0);
1721 dout("uninline_data %p %llx.%llx inline_version %llu = %d\n",
1722 inode, ceph_vinop(inode), inline_version, err);
1726 static const struct vm_operations_struct ceph_vmops = {
1727 .fault = ceph_filemap_fault,
1728 .page_mkwrite = ceph_page_mkwrite,
1731 int ceph_mmap(struct file *file, struct vm_area_struct *vma)
1733 struct address_space *mapping = file->f_mapping;
1735 if (!mapping->a_ops->readpage)
1737 file_accessed(file);
1738 vma->vm_ops = &ceph_vmops;
1747 static int __ceph_pool_perm_get(struct ceph_inode_info *ci,
1748 s64 pool, struct ceph_string *pool_ns)
1750 struct ceph_fs_client *fsc = ceph_inode_to_client(&ci->vfs_inode);
1751 struct ceph_mds_client *mdsc = fsc->mdsc;
1752 struct ceph_osd_request *rd_req = NULL, *wr_req = NULL;
1753 struct rb_node **p, *parent;
1754 struct ceph_pool_perm *perm;
1755 struct page **pages;
1757 int err = 0, err2 = 0, have = 0;
1759 down_read(&mdsc->pool_perm_rwsem);
1760 p = &mdsc->pool_perm_tree.rb_node;
1762 perm = rb_entry(*p, struct ceph_pool_perm, node);
1763 if (pool < perm->pool)
1765 else if (pool > perm->pool)
1766 p = &(*p)->rb_right;
1768 int ret = ceph_compare_string(pool_ns,
1774 p = &(*p)->rb_right;
1781 up_read(&mdsc->pool_perm_rwsem);
1786 dout("__ceph_pool_perm_get pool %lld ns %.*s no perm cached\n",
1787 pool, (int)pool_ns->len, pool_ns->str);
1789 dout("__ceph_pool_perm_get pool %lld no perm cached\n", pool);
1791 down_write(&mdsc->pool_perm_rwsem);
1792 p = &mdsc->pool_perm_tree.rb_node;
1796 perm = rb_entry(parent, struct ceph_pool_perm, node);
1797 if (pool < perm->pool)
1799 else if (pool > perm->pool)
1800 p = &(*p)->rb_right;
1802 int ret = ceph_compare_string(pool_ns,
1808 p = &(*p)->rb_right;
1816 up_write(&mdsc->pool_perm_rwsem);
1820 rd_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL,
1821 1, false, GFP_NOFS);
1827 rd_req->r_flags = CEPH_OSD_FLAG_READ;
1828 osd_req_op_init(rd_req, 0, CEPH_OSD_OP_STAT, 0);
1829 rd_req->r_base_oloc.pool = pool;
1831 rd_req->r_base_oloc.pool_ns = ceph_get_string(pool_ns);
1832 ceph_oid_printf(&rd_req->r_base_oid, "%llx.00000000", ci->i_vino.ino);
1834 err = ceph_osdc_alloc_messages(rd_req, GFP_NOFS);
1838 wr_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL,
1839 1, false, GFP_NOFS);
1845 wr_req->r_flags = CEPH_OSD_FLAG_WRITE;
1846 osd_req_op_init(wr_req, 0, CEPH_OSD_OP_CREATE, CEPH_OSD_OP_FLAG_EXCL);
1847 ceph_oloc_copy(&wr_req->r_base_oloc, &rd_req->r_base_oloc);
1848 ceph_oid_copy(&wr_req->r_base_oid, &rd_req->r_base_oid);
1850 err = ceph_osdc_alloc_messages(wr_req, GFP_NOFS);
1854 /* one page should be large enough for STAT data */
1855 pages = ceph_alloc_page_vector(1, GFP_KERNEL);
1856 if (IS_ERR(pages)) {
1857 err = PTR_ERR(pages);
1861 osd_req_op_raw_data_in_pages(rd_req, 0, pages, PAGE_SIZE,
1863 err = ceph_osdc_start_request(&fsc->client->osdc, rd_req, false);
1865 wr_req->r_mtime = ci->vfs_inode.i_mtime;
1866 err2 = ceph_osdc_start_request(&fsc->client->osdc, wr_req, false);
1869 err = ceph_osdc_wait_request(&fsc->client->osdc, rd_req);
1871 err2 = ceph_osdc_wait_request(&fsc->client->osdc, wr_req);
1873 if (err >= 0 || err == -ENOENT)
1875 else if (err != -EPERM) {
1876 if (err == -EBLOCKLISTED)
1877 fsc->blocklisted = true;
1881 if (err2 == 0 || err2 == -EEXIST)
1883 else if (err2 != -EPERM) {
1884 if (err2 == -EBLOCKLISTED)
1885 fsc->blocklisted = true;
1890 pool_ns_len = pool_ns ? pool_ns->len : 0;
1891 perm = kmalloc(sizeof(*perm) + pool_ns_len + 1, GFP_NOFS);
1899 perm->pool_ns_len = pool_ns_len;
1900 if (pool_ns_len > 0)
1901 memcpy(perm->pool_ns, pool_ns->str, pool_ns_len);
1902 perm->pool_ns[pool_ns_len] = 0;
1904 rb_link_node(&perm->node, parent, p);
1905 rb_insert_color(&perm->node, &mdsc->pool_perm_tree);
1908 up_write(&mdsc->pool_perm_rwsem);
1910 ceph_osdc_put_request(rd_req);
1911 ceph_osdc_put_request(wr_req);
1916 dout("__ceph_pool_perm_get pool %lld ns %.*s result = %d\n",
1917 pool, (int)pool_ns->len, pool_ns->str, err);
1919 dout("__ceph_pool_perm_get pool %lld result = %d\n", pool, err);
1923 int ceph_pool_perm_check(struct inode *inode, int need)
1925 struct ceph_inode_info *ci = ceph_inode(inode);
1926 struct ceph_string *pool_ns;
1930 /* Only need to do this for regular files */
1931 if (!S_ISREG(inode->i_mode))
1934 if (ci->i_vino.snap != CEPH_NOSNAP) {
1936 * Pool permission check needs to write to the first object.
1937 * But for snapshot, head of the first object may have alread
1938 * been deleted. Skip check to avoid creating orphan object.
1943 if (ceph_test_mount_opt(ceph_inode_to_client(inode),
1947 spin_lock(&ci->i_ceph_lock);
1948 flags = ci->i_ceph_flags;
1949 pool = ci->i_layout.pool_id;
1950 spin_unlock(&ci->i_ceph_lock);
1952 if (flags & CEPH_I_POOL_PERM) {
1953 if ((need & CEPH_CAP_FILE_RD) && !(flags & CEPH_I_POOL_RD)) {
1954 dout("ceph_pool_perm_check pool %lld no read perm\n",
1958 if ((need & CEPH_CAP_FILE_WR) && !(flags & CEPH_I_POOL_WR)) {
1959 dout("ceph_pool_perm_check pool %lld no write perm\n",
1966 pool_ns = ceph_try_get_string(ci->i_layout.pool_ns);
1967 ret = __ceph_pool_perm_get(ci, pool, pool_ns);
1968 ceph_put_string(pool_ns);
1972 flags = CEPH_I_POOL_PERM;
1973 if (ret & POOL_READ)
1974 flags |= CEPH_I_POOL_RD;
1975 if (ret & POOL_WRITE)
1976 flags |= CEPH_I_POOL_WR;
1978 spin_lock(&ci->i_ceph_lock);
1979 if (pool == ci->i_layout.pool_id &&
1980 pool_ns == rcu_dereference_raw(ci->i_layout.pool_ns)) {
1981 ci->i_ceph_flags |= flags;
1983 pool = ci->i_layout.pool_id;
1984 flags = ci->i_ceph_flags;
1986 spin_unlock(&ci->i_ceph_lock);
1990 void ceph_pool_perm_destroy(struct ceph_mds_client *mdsc)
1992 struct ceph_pool_perm *perm;
1995 while (!RB_EMPTY_ROOT(&mdsc->pool_perm_tree)) {
1996 n = rb_first(&mdsc->pool_perm_tree);
1997 perm = rb_entry(n, struct ceph_pool_perm, node);
1998 rb_erase(n, &mdsc->pool_perm_tree);