1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/ceph/ceph_debug.h>
3
4 #include <linux/backing-dev.h>
5 #include <linux/fs.h>
6 #include <linux/mm.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>
16
17 #include "super.h"
18 #include "mds_client.h"
19 #include "cache.h"
20 #include "metric.h"
21 #include "crypto.h"
22 #include <linux/ceph/osd_client.h>
23 #include <linux/ceph/striper.h>
24
25 /*
26 * Ceph address space ops.
27 *
28 * There are a few funny things going on here.
29 *
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.
34 *
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.
38 *
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.
49 *
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
55 * pages.
56 *
57 * Invalidate and so forth must take care to ensure the dirty page
58 * accounting is preserved.
59 */
60
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))
65
66 static int ceph_netfs_check_write_begin(struct file *file, loff_t pos, unsigned int len,
67 struct folio **foliop, void **_fsdata);
68
page_snap_context(struct page * page)69 static inline struct ceph_snap_context *page_snap_context(struct page *page)
70 {
71 if (PagePrivate(page))
72 return (void *)page->private;
73 return NULL;
74 }
75
76 /*
77 * Dirty a page. Optimistically adjust accounting, on the assumption
78 * that we won't race with invalidate. If we do, readjust.
79 */
ceph_dirty_folio(struct address_space * mapping,struct folio * folio)80 static bool ceph_dirty_folio(struct address_space *mapping, struct folio *folio)
81 {
82 struct inode *inode;
83 struct ceph_inode_info *ci;
84 struct ceph_snap_context *snapc;
85
86 if (folio_test_dirty(folio)) {
87 dout("%p dirty_folio %p idx %lu -- already dirty\n",
88 mapping->host, folio, folio->index);
89 VM_BUG_ON_FOLIO(!folio_test_private(folio), folio);
90 return false;
91 }
92
93 inode = mapping->host;
94 ci = ceph_inode(inode);
95
96 /* dirty the head */
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,
103 ci_item);
104 snapc = ceph_get_snap_context(capsnap->context);
105 capsnap->dirty_pages++;
106 } else {
107 BUG_ON(!ci->i_head_snapc);
108 snapc = ceph_get_snap_context(ci->i_head_snapc);
109 ++ci->i_wrbuffer_ref_head;
110 }
111 if (ci->i_wrbuffer_ref == 0)
112 ihold(inode);
113 ++ci->i_wrbuffer_ref;
114 dout("%p dirty_folio %p idx %lu head %d/%d -> %d/%d "
115 "snapc %p seq %lld (%d snaps)\n",
116 mapping->host, 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);
121
122 /*
123 * Reference snap context in folio->private. Also set
124 * PagePrivate so that we get invalidate_folio callback.
125 */
126 VM_WARN_ON_FOLIO(folio->private, folio);
127 folio_attach_private(folio, snapc);
128
129 return ceph_fscache_dirty_folio(mapping, folio);
130 }
131
132 /*
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
135 * data on the folio.
136 */
ceph_invalidate_folio(struct folio * folio,size_t offset,size_t length)137 static void ceph_invalidate_folio(struct folio *folio, size_t offset,
138 size_t length)
139 {
140 struct inode *inode;
141 struct ceph_inode_info *ci;
142 struct ceph_snap_context *snapc;
143
144 inode = folio->mapping->host;
145 ci = ceph_inode(inode);
146
147 if (offset != 0 || length != folio_size(folio)) {
148 dout("%p invalidate_folio idx %lu partial dirty page %zu~%zu\n",
149 inode, folio->index, offset, length);
150 return;
151 }
152
153 WARN_ON(!folio_test_locked(folio));
154 if (folio_test_private(folio)) {
155 dout("%p invalidate_folio idx %lu full dirty page\n",
156 inode, folio->index);
157
158 snapc = folio_detach_private(folio);
159 ceph_put_wrbuffer_cap_refs(ci, 1, snapc);
160 ceph_put_snap_context(snapc);
161 }
162
163 folio_wait_fscache(folio);
164 }
165
ceph_release_folio(struct folio * folio,gfp_t gfp)166 static bool ceph_release_folio(struct folio *folio, gfp_t gfp)
167 {
168 struct inode *inode = folio->mapping->host;
169
170 dout("%llx:%llx release_folio idx %lu (%sdirty)\n",
171 ceph_vinop(inode),
172 folio->index, folio_test_dirty(folio) ? "" : "not ");
173
174 if (folio_test_private(folio))
175 return false;
176
177 if (folio_test_fscache(folio)) {
178 if (current_is_kswapd() || !(gfp & __GFP_FS))
179 return false;
180 folio_wait_fscache(folio);
181 }
182 ceph_fscache_note_page_release(inode);
183 return true;
184 }
185
ceph_netfs_expand_readahead(struct netfs_io_request * rreq)186 static void ceph_netfs_expand_readahead(struct netfs_io_request *rreq)
187 {
188 struct inode *inode = rreq->inode;
189 struct ceph_inode_info *ci = ceph_inode(inode);
190 struct ceph_file_layout *lo = &ci->i_layout;
191 unsigned long max_pages = inode->i_sb->s_bdi->ra_pages;
192 loff_t end = rreq->start + rreq->len, new_end;
193 struct ceph_netfs_request_data *priv = rreq->netfs_priv;
194 unsigned long max_len;
195 u32 blockoff;
196
197 if (priv) {
198 /* Readahead is disabled by posix_fadvise POSIX_FADV_RANDOM */
199 if (priv->file_ra_disabled)
200 max_pages = 0;
201 else
202 max_pages = priv->file_ra_pages;
203
204 }
205
206 /* Readahead is disabled */
207 if (!max_pages)
208 return;
209
210 max_len = max_pages << PAGE_SHIFT;
211
212 /*
213 * Try to expand the length forward by rounding up it to the next
214 * block, but do not exceed the file size, unless the original
215 * request already exceeds it.
216 */
217 new_end = min(round_up(end, lo->stripe_unit), rreq->i_size);
218 if (new_end > end && new_end <= rreq->start + max_len)
219 rreq->len = new_end - rreq->start;
220
221 /* Try to expand the start downward */
222 div_u64_rem(rreq->start, lo->stripe_unit, &blockoff);
223 if (rreq->len + blockoff <= max_len) {
224 rreq->start -= blockoff;
225 rreq->len += blockoff;
226 }
227 }
228
ceph_netfs_clamp_length(struct netfs_io_subrequest * subreq)229 static bool ceph_netfs_clamp_length(struct netfs_io_subrequest *subreq)
230 {
231 struct inode *inode = subreq->rreq->inode;
232 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
233 struct ceph_inode_info *ci = ceph_inode(inode);
234 u64 objno, objoff;
235 u32 xlen;
236
237 /* Truncate the extent at the end of the current block */
238 ceph_calc_file_object_mapping(&ci->i_layout, subreq->start, subreq->len,
239 &objno, &objoff, &xlen);
240 subreq->len = min(xlen, fsc->mount_options->rsize);
241 return true;
242 }
243
finish_netfs_read(struct ceph_osd_request * req)244 static void finish_netfs_read(struct ceph_osd_request *req)
245 {
246 struct inode *inode = req->r_inode;
247 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
248 struct ceph_osd_data *osd_data = osd_req_op_extent_osd_data(req, 0);
249 struct netfs_io_subrequest *subreq = req->r_priv;
250 struct ceph_osd_req_op *op = &req->r_ops[0];
251 int err = req->r_result;
252 bool sparse = (op->op == CEPH_OSD_OP_SPARSE_READ);
253
254 ceph_update_read_metrics(&fsc->mdsc->metric, req->r_start_latency,
255 req->r_end_latency, osd_data->length, err);
256
257 dout("%s: result %d subreq->len=%zu i_size=%lld\n", __func__, req->r_result,
258 subreq->len, i_size_read(req->r_inode));
259
260 /* no object means success but no data */
261 if (err == -ENOENT)
262 err = 0;
263 else if (err == -EBLOCKLISTED)
264 fsc->blocklisted = true;
265
266 if (err >= 0) {
267 if (sparse && err > 0)
268 err = ceph_sparse_ext_map_end(op);
269 if (err < subreq->len)
270 __set_bit(NETFS_SREQ_CLEAR_TAIL, &subreq->flags);
271 if (IS_ENCRYPTED(inode) && err > 0) {
272 err = ceph_fscrypt_decrypt_extents(inode,
273 osd_data->pages, subreq->start,
274 op->extent.sparse_ext,
275 op->extent.sparse_ext_cnt);
276 if (err > subreq->len)
277 err = subreq->len;
278 }
279 }
280
281 if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES) {
282 ceph_put_page_vector(osd_data->pages,
283 calc_pages_for(osd_data->alignment,
284 osd_data->length), false);
285 }
286 netfs_subreq_terminated(subreq, err, false);
287 iput(req->r_inode);
288 ceph_dec_osd_stopping_blocker(fsc->mdsc);
289 }
290
ceph_netfs_issue_op_inline(struct netfs_io_subrequest * subreq)291 static bool ceph_netfs_issue_op_inline(struct netfs_io_subrequest *subreq)
292 {
293 struct netfs_io_request *rreq = subreq->rreq;
294 struct inode *inode = rreq->inode;
295 struct ceph_mds_reply_info_parsed *rinfo;
296 struct ceph_mds_reply_info_in *iinfo;
297 struct ceph_mds_request *req;
298 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
299 struct ceph_inode_info *ci = ceph_inode(inode);
300 struct iov_iter iter;
301 ssize_t err = 0;
302 size_t len;
303 int mode;
304
305 __set_bit(NETFS_SREQ_CLEAR_TAIL, &subreq->flags);
306 __clear_bit(NETFS_SREQ_COPY_TO_CACHE, &subreq->flags);
307
308 if (subreq->start >= inode->i_size)
309 goto out;
310
311 /* We need to fetch the inline data. */
312 mode = ceph_try_to_choose_auth_mds(inode, CEPH_STAT_CAP_INLINE_DATA);
313 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, mode);
314 if (IS_ERR(req)) {
315 err = PTR_ERR(req);
316 goto out;
317 }
318 req->r_ino1 = ci->i_vino;
319 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INLINE_DATA);
320 req->r_num_caps = 2;
321
322 err = ceph_mdsc_do_request(mdsc, NULL, req);
323 if (err < 0)
324 goto out;
325
326 rinfo = &req->r_reply_info;
327 iinfo = &rinfo->targeti;
328 if (iinfo->inline_version == CEPH_INLINE_NONE) {
329 /* The data got uninlined */
330 ceph_mdsc_put_request(req);
331 return false;
332 }
333
334 len = min_t(size_t, iinfo->inline_len - subreq->start, subreq->len);
335 iov_iter_xarray(&iter, ITER_DEST, &rreq->mapping->i_pages, subreq->start, len);
336 err = copy_to_iter(iinfo->inline_data + subreq->start, len, &iter);
337 if (err == 0)
338 err = -EFAULT;
339
340 ceph_mdsc_put_request(req);
341 out:
342 netfs_subreq_terminated(subreq, err, false);
343 return true;
344 }
345
ceph_netfs_issue_read(struct netfs_io_subrequest * subreq)346 static void ceph_netfs_issue_read(struct netfs_io_subrequest *subreq)
347 {
348 struct netfs_io_request *rreq = subreq->rreq;
349 struct inode *inode = rreq->inode;
350 struct ceph_inode_info *ci = ceph_inode(inode);
351 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
352 struct ceph_osd_request *req = NULL;
353 struct ceph_vino vino = ceph_vino(inode);
354 struct iov_iter iter;
355 int err = 0;
356 u64 len = subreq->len;
357 bool sparse = IS_ENCRYPTED(inode) || ceph_test_mount_opt(fsc, SPARSEREAD);
358 u64 off = subreq->start;
359
360 if (ceph_inode_is_shutdown(inode)) {
361 err = -EIO;
362 goto out;
363 }
364
365 if (ceph_has_inline_data(ci) && ceph_netfs_issue_op_inline(subreq))
366 return;
367
368 ceph_fscrypt_adjust_off_and_len(inode, &off, &len);
369
370 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, vino,
371 off, &len, 0, 1, sparse ? CEPH_OSD_OP_SPARSE_READ : CEPH_OSD_OP_READ,
372 CEPH_OSD_FLAG_READ | fsc->client->osdc.client->options->read_from_replica,
373 NULL, ci->i_truncate_seq, ci->i_truncate_size, false);
374 if (IS_ERR(req)) {
375 err = PTR_ERR(req);
376 req = NULL;
377 goto out;
378 }
379
380 if (sparse) {
381 err = ceph_alloc_sparse_ext_map(&req->r_ops[0]);
382 if (err)
383 goto out;
384 }
385
386 dout("%s: pos=%llu orig_len=%zu len=%llu\n", __func__, subreq->start, subreq->len, len);
387
388 iov_iter_xarray(&iter, ITER_DEST, &rreq->mapping->i_pages, subreq->start, len);
389
390 /*
391 * FIXME: For now, use CEPH_OSD_DATA_TYPE_PAGES instead of _ITER for
392 * encrypted inodes. We'd need infrastructure that handles an iov_iter
393 * instead of page arrays, and we don't have that as of yet. Once the
394 * dust settles on the write helpers and encrypt/decrypt routines for
395 * netfs, we should be able to rework this.
396 */
397 if (IS_ENCRYPTED(inode)) {
398 struct page **pages;
399 size_t page_off;
400
401 err = iov_iter_get_pages_alloc2(&iter, &pages, len, &page_off);
402 if (err < 0) {
403 dout("%s: iov_ter_get_pages_alloc returned %d\n",
404 __func__, err);
405 goto out;
406 }
407
408 /* should always give us a page-aligned read */
409 WARN_ON_ONCE(page_off);
410 len = err;
411 err = 0;
412
413 osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0, false,
414 false);
415 } else {
416 osd_req_op_extent_osd_iter(req, 0, &iter);
417 }
418 if (!ceph_inc_osd_stopping_blocker(fsc->mdsc)) {
419 err = -EIO;
420 goto out;
421 }
422 req->r_callback = finish_netfs_read;
423 req->r_priv = subreq;
424 req->r_inode = inode;
425 ihold(inode);
426
427 ceph_osdc_start_request(req->r_osdc, req);
428 out:
429 ceph_osdc_put_request(req);
430 if (err)
431 netfs_subreq_terminated(subreq, err, false);
432 dout("%s: result %d\n", __func__, err);
433 }
434
ceph_init_request(struct netfs_io_request * rreq,struct file * file)435 static int ceph_init_request(struct netfs_io_request *rreq, struct file *file)
436 {
437 struct inode *inode = rreq->inode;
438 int got = 0, want = CEPH_CAP_FILE_CACHE;
439 struct ceph_netfs_request_data *priv;
440 int ret = 0;
441
442 if (rreq->origin != NETFS_READAHEAD)
443 return 0;
444
445 priv = kzalloc(sizeof(*priv), GFP_NOFS);
446 if (!priv)
447 return -ENOMEM;
448
449 if (file) {
450 struct ceph_rw_context *rw_ctx;
451 struct ceph_file_info *fi = file->private_data;
452
453 priv->file_ra_pages = file->f_ra.ra_pages;
454 priv->file_ra_disabled = file->f_mode & FMODE_RANDOM;
455
456 rw_ctx = ceph_find_rw_context(fi);
457 if (rw_ctx) {
458 rreq->netfs_priv = priv;
459 return 0;
460 }
461 }
462
463 /*
464 * readahead callers do not necessarily hold Fcb caps
465 * (e.g. fadvise, madvise).
466 */
467 ret = ceph_try_get_caps(inode, CEPH_CAP_FILE_RD, want, true, &got);
468 if (ret < 0) {
469 dout("start_read %p, error getting cap\n", inode);
470 goto out;
471 }
472
473 if (!(got & want)) {
474 dout("start_read %p, no cache cap\n", inode);
475 ret = -EACCES;
476 goto out;
477 }
478 if (ret == 0) {
479 ret = -EACCES;
480 goto out;
481 }
482
483 priv->caps = got;
484 rreq->netfs_priv = priv;
485
486 out:
487 if (ret < 0)
488 kfree(priv);
489
490 return ret;
491 }
492
ceph_netfs_free_request(struct netfs_io_request * rreq)493 static void ceph_netfs_free_request(struct netfs_io_request *rreq)
494 {
495 struct ceph_netfs_request_data *priv = rreq->netfs_priv;
496
497 if (!priv)
498 return;
499
500 if (priv->caps)
501 ceph_put_cap_refs(ceph_inode(rreq->inode), priv->caps);
502 kfree(priv);
503 rreq->netfs_priv = NULL;
504 }
505
506 const struct netfs_request_ops ceph_netfs_ops = {
507 .init_request = ceph_init_request,
508 .free_request = ceph_netfs_free_request,
509 .begin_cache_operation = ceph_begin_cache_operation,
510 .issue_read = ceph_netfs_issue_read,
511 .expand_readahead = ceph_netfs_expand_readahead,
512 .clamp_length = ceph_netfs_clamp_length,
513 .check_write_begin = ceph_netfs_check_write_begin,
514 };
515
516 #ifdef CONFIG_CEPH_FSCACHE
ceph_set_page_fscache(struct page * page)517 static void ceph_set_page_fscache(struct page *page)
518 {
519 set_page_fscache(page);
520 }
521
ceph_fscache_write_terminated(void * priv,ssize_t error,bool was_async)522 static void ceph_fscache_write_terminated(void *priv, ssize_t error, bool was_async)
523 {
524 struct inode *inode = priv;
525
526 if (IS_ERR_VALUE(error) && error != -ENOBUFS)
527 ceph_fscache_invalidate(inode, false);
528 }
529
ceph_fscache_write_to_cache(struct inode * inode,u64 off,u64 len,bool caching)530 static void ceph_fscache_write_to_cache(struct inode *inode, u64 off, u64 len, bool caching)
531 {
532 struct ceph_inode_info *ci = ceph_inode(inode);
533 struct fscache_cookie *cookie = ceph_fscache_cookie(ci);
534
535 fscache_write_to_cache(cookie, inode->i_mapping, off, len, i_size_read(inode),
536 ceph_fscache_write_terminated, inode, caching);
537 }
538 #else
ceph_set_page_fscache(struct page * page)539 static inline void ceph_set_page_fscache(struct page *page)
540 {
541 }
542
ceph_fscache_write_to_cache(struct inode * inode,u64 off,u64 len,bool caching)543 static inline void ceph_fscache_write_to_cache(struct inode *inode, u64 off, u64 len, bool caching)
544 {
545 }
546 #endif /* CONFIG_CEPH_FSCACHE */
547
548 struct ceph_writeback_ctl
549 {
550 loff_t i_size;
551 u64 truncate_size;
552 u32 truncate_seq;
553 bool size_stable;
554 bool head_snapc;
555 };
556
557 /*
558 * Get ref for the oldest snapc for an inode with dirty data... that is, the
559 * only snap context we are allowed to write back.
560 */
561 static struct ceph_snap_context *
get_oldest_context(struct inode * inode,struct ceph_writeback_ctl * ctl,struct ceph_snap_context * page_snapc)562 get_oldest_context(struct inode *inode, struct ceph_writeback_ctl *ctl,
563 struct ceph_snap_context *page_snapc)
564 {
565 struct ceph_inode_info *ci = ceph_inode(inode);
566 struct ceph_snap_context *snapc = NULL;
567 struct ceph_cap_snap *capsnap = NULL;
568
569 spin_lock(&ci->i_ceph_lock);
570 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
571 dout(" cap_snap %p snapc %p has %d dirty pages\n", capsnap,
572 capsnap->context, capsnap->dirty_pages);
573 if (!capsnap->dirty_pages)
574 continue;
575
576 /* get i_size, truncate_{seq,size} for page_snapc? */
577 if (snapc && capsnap->context != page_snapc)
578 continue;
579
580 if (ctl) {
581 if (capsnap->writing) {
582 ctl->i_size = i_size_read(inode);
583 ctl->size_stable = false;
584 } else {
585 ctl->i_size = capsnap->size;
586 ctl->size_stable = true;
587 }
588 ctl->truncate_size = capsnap->truncate_size;
589 ctl->truncate_seq = capsnap->truncate_seq;
590 ctl->head_snapc = false;
591 }
592
593 if (snapc)
594 break;
595
596 snapc = ceph_get_snap_context(capsnap->context);
597 if (!page_snapc ||
598 page_snapc == snapc ||
599 page_snapc->seq > snapc->seq)
600 break;
601 }
602 if (!snapc && ci->i_wrbuffer_ref_head) {
603 snapc = ceph_get_snap_context(ci->i_head_snapc);
604 dout(" head snapc %p has %d dirty pages\n",
605 snapc, ci->i_wrbuffer_ref_head);
606 if (ctl) {
607 ctl->i_size = i_size_read(inode);
608 ctl->truncate_size = ci->i_truncate_size;
609 ctl->truncate_seq = ci->i_truncate_seq;
610 ctl->size_stable = false;
611 ctl->head_snapc = true;
612 }
613 }
614 spin_unlock(&ci->i_ceph_lock);
615 return snapc;
616 }
617
get_writepages_data_length(struct inode * inode,struct page * page,u64 start)618 static u64 get_writepages_data_length(struct inode *inode,
619 struct page *page, u64 start)
620 {
621 struct ceph_inode_info *ci = ceph_inode(inode);
622 struct ceph_snap_context *snapc;
623 struct ceph_cap_snap *capsnap = NULL;
624 u64 end = i_size_read(inode);
625 u64 ret;
626
627 snapc = page_snap_context(ceph_fscrypt_pagecache_page(page));
628 if (snapc != ci->i_head_snapc) {
629 bool found = false;
630 spin_lock(&ci->i_ceph_lock);
631 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
632 if (capsnap->context == snapc) {
633 if (!capsnap->writing)
634 end = capsnap->size;
635 found = true;
636 break;
637 }
638 }
639 spin_unlock(&ci->i_ceph_lock);
640 WARN_ON(!found);
641 }
642 if (end > ceph_fscrypt_page_offset(page) + thp_size(page))
643 end = ceph_fscrypt_page_offset(page) + thp_size(page);
644 ret = end > start ? end - start : 0;
645 if (ret && fscrypt_is_bounce_page(page))
646 ret = round_up(ret, CEPH_FSCRYPT_BLOCK_SIZE);
647 return ret;
648 }
649
650 /*
651 * Write a single page, but leave the page locked.
652 *
653 * If we get a write error, mark the mapping for error, but still adjust the
654 * dirty page accounting (i.e., page is no longer dirty).
655 */
writepage_nounlock(struct page * page,struct writeback_control * wbc)656 static int writepage_nounlock(struct page *page, struct writeback_control *wbc)
657 {
658 struct folio *folio = page_folio(page);
659 struct inode *inode = page->mapping->host;
660 struct ceph_inode_info *ci = ceph_inode(inode);
661 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
662 struct ceph_snap_context *snapc, *oldest;
663 loff_t page_off = page_offset(page);
664 int err;
665 loff_t len = thp_size(page);
666 loff_t wlen;
667 struct ceph_writeback_ctl ceph_wbc;
668 struct ceph_osd_client *osdc = &fsc->client->osdc;
669 struct ceph_osd_request *req;
670 bool caching = ceph_is_cache_enabled(inode);
671 struct page *bounce_page = NULL;
672
673 dout("writepage %p idx %lu\n", page, page->index);
674
675 if (ceph_inode_is_shutdown(inode))
676 return -EIO;
677
678 /* verify this is a writeable snap context */
679 snapc = page_snap_context(page);
680 if (!snapc) {
681 dout("writepage %p page %p not dirty?\n", inode, page);
682 return 0;
683 }
684 oldest = get_oldest_context(inode, &ceph_wbc, snapc);
685 if (snapc->seq > oldest->seq) {
686 dout("writepage %p page %p snapc %p not writeable - noop\n",
687 inode, page, snapc);
688 /* we should only noop if called by kswapd */
689 WARN_ON(!(current->flags & PF_MEMALLOC));
690 ceph_put_snap_context(oldest);
691 redirty_page_for_writepage(wbc, page);
692 return 0;
693 }
694 ceph_put_snap_context(oldest);
695
696 /* is this a partial page at end of file? */
697 if (page_off >= ceph_wbc.i_size) {
698 dout("folio at %lu beyond eof %llu\n", folio->index,
699 ceph_wbc.i_size);
700 folio_invalidate(folio, 0, folio_size(folio));
701 return 0;
702 }
703
704 if (ceph_wbc.i_size < page_off + len)
705 len = ceph_wbc.i_size - page_off;
706
707 wlen = IS_ENCRYPTED(inode) ? round_up(len, CEPH_FSCRYPT_BLOCK_SIZE) : len;
708 dout("writepage %p page %p index %lu on %llu~%llu snapc %p seq %lld\n",
709 inode, page, page->index, page_off, wlen, snapc, snapc->seq);
710
711 if (atomic_long_inc_return(&fsc->writeback_count) >
712 CONGESTION_ON_THRESH(fsc->mount_options->congestion_kb))
713 fsc->write_congested = true;
714
715 req = ceph_osdc_new_request(osdc, &ci->i_layout, ceph_vino(inode),
716 page_off, &wlen, 0, 1, CEPH_OSD_OP_WRITE,
717 CEPH_OSD_FLAG_WRITE, snapc,
718 ceph_wbc.truncate_seq,
719 ceph_wbc.truncate_size, true);
720 if (IS_ERR(req)) {
721 redirty_page_for_writepage(wbc, page);
722 return PTR_ERR(req);
723 }
724
725 if (wlen < len)
726 len = wlen;
727
728 set_page_writeback(page);
729 if (caching)
730 ceph_set_page_fscache(page);
731 ceph_fscache_write_to_cache(inode, page_off, len, caching);
732
733 if (IS_ENCRYPTED(inode)) {
734 bounce_page = fscrypt_encrypt_pagecache_blocks(page,
735 CEPH_FSCRYPT_BLOCK_SIZE, 0,
736 GFP_NOFS);
737 if (IS_ERR(bounce_page)) {
738 redirty_page_for_writepage(wbc, page);
739 end_page_writeback(page);
740 ceph_osdc_put_request(req);
741 return PTR_ERR(bounce_page);
742 }
743 }
744
745 /* it may be a short write due to an object boundary */
746 WARN_ON_ONCE(len > thp_size(page));
747 osd_req_op_extent_osd_data_pages(req, 0,
748 bounce_page ? &bounce_page : &page, wlen, 0,
749 false, false);
750 dout("writepage %llu~%llu (%llu bytes, %sencrypted)\n",
751 page_off, len, wlen, IS_ENCRYPTED(inode) ? "" : "not ");
752
753 req->r_mtime = inode->i_mtime;
754 ceph_osdc_start_request(osdc, req);
755 err = ceph_osdc_wait_request(osdc, req);
756
757 ceph_update_write_metrics(&fsc->mdsc->metric, req->r_start_latency,
758 req->r_end_latency, len, err);
759 fscrypt_free_bounce_page(bounce_page);
760 ceph_osdc_put_request(req);
761 if (err == 0)
762 err = len;
763
764 if (err < 0) {
765 struct writeback_control tmp_wbc;
766 if (!wbc)
767 wbc = &tmp_wbc;
768 if (err == -ERESTARTSYS) {
769 /* killed by SIGKILL */
770 dout("writepage interrupted page %p\n", page);
771 redirty_page_for_writepage(wbc, page);
772 end_page_writeback(page);
773 return err;
774 }
775 if (err == -EBLOCKLISTED)
776 fsc->blocklisted = true;
777 dout("writepage setting page/mapping error %d %p\n",
778 err, page);
779 mapping_set_error(&inode->i_data, err);
780 wbc->pages_skipped++;
781 } else {
782 dout("writepage cleaned page %p\n", page);
783 err = 0; /* vfs expects us to return 0 */
784 }
785 oldest = detach_page_private(page);
786 WARN_ON_ONCE(oldest != snapc);
787 end_page_writeback(page);
788 ceph_put_wrbuffer_cap_refs(ci, 1, snapc);
789 ceph_put_snap_context(snapc); /* page's reference */
790
791 if (atomic_long_dec_return(&fsc->writeback_count) <
792 CONGESTION_OFF_THRESH(fsc->mount_options->congestion_kb))
793 fsc->write_congested = false;
794
795 return err;
796 }
797
ceph_writepage(struct page * page,struct writeback_control * wbc)798 static int ceph_writepage(struct page *page, struct writeback_control *wbc)
799 {
800 int err;
801 struct inode *inode = page->mapping->host;
802 BUG_ON(!inode);
803 ihold(inode);
804
805 if (wbc->sync_mode == WB_SYNC_NONE &&
806 ceph_inode_to_fs_client(inode)->write_congested) {
807 redirty_page_for_writepage(wbc, page);
808 return AOP_WRITEPAGE_ACTIVATE;
809 }
810
811 wait_on_page_fscache(page);
812
813 err = writepage_nounlock(page, wbc);
814 if (err == -ERESTARTSYS) {
815 /* direct memory reclaimer was killed by SIGKILL. return 0
816 * to prevent caller from setting mapping/page error */
817 err = 0;
818 }
819 unlock_page(page);
820 iput(inode);
821 return err;
822 }
823
824 /*
825 * async writeback completion handler.
826 *
827 * If we get an error, set the mapping error bit, but not the individual
828 * page error bits.
829 */
writepages_finish(struct ceph_osd_request * req)830 static void writepages_finish(struct ceph_osd_request *req)
831 {
832 struct inode *inode = req->r_inode;
833 struct ceph_inode_info *ci = ceph_inode(inode);
834 struct ceph_osd_data *osd_data;
835 struct page *page;
836 int num_pages, total_pages = 0;
837 int i, j;
838 int rc = req->r_result;
839 struct ceph_snap_context *snapc = req->r_snapc;
840 struct address_space *mapping = inode->i_mapping;
841 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
842 unsigned int len = 0;
843 bool remove_page;
844
845 dout("writepages_finish %p rc %d\n", inode, rc);
846 if (rc < 0) {
847 mapping_set_error(mapping, rc);
848 ceph_set_error_write(ci);
849 if (rc == -EBLOCKLISTED)
850 fsc->blocklisted = true;
851 } else {
852 ceph_clear_error_write(ci);
853 }
854
855 /*
856 * We lost the cache cap, need to truncate the page before
857 * it is unlocked, otherwise we'd truncate it later in the
858 * page truncation thread, possibly losing some data that
859 * raced its way in
860 */
861 remove_page = !(ceph_caps_issued(ci) &
862 (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO));
863
864 /* clean all pages */
865 for (i = 0; i < req->r_num_ops; i++) {
866 if (req->r_ops[i].op != CEPH_OSD_OP_WRITE) {
867 pr_warn("%s incorrect op %d req %p index %d tid %llu\n",
868 __func__, req->r_ops[i].op, req, i, req->r_tid);
869 break;
870 }
871
872 osd_data = osd_req_op_extent_osd_data(req, i);
873 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES);
874 len += osd_data->length;
875 num_pages = calc_pages_for((u64)osd_data->alignment,
876 (u64)osd_data->length);
877 total_pages += num_pages;
878 for (j = 0; j < num_pages; j++) {
879 page = osd_data->pages[j];
880 if (fscrypt_is_bounce_page(page)) {
881 page = fscrypt_pagecache_page(page);
882 fscrypt_free_bounce_page(osd_data->pages[j]);
883 osd_data->pages[j] = page;
884 }
885 BUG_ON(!page);
886 WARN_ON(!PageUptodate(page));
887
888 if (atomic_long_dec_return(&fsc->writeback_count) <
889 CONGESTION_OFF_THRESH(
890 fsc->mount_options->congestion_kb))
891 fsc->write_congested = false;
892
893 ceph_put_snap_context(detach_page_private(page));
894 end_page_writeback(page);
895 dout("unlocking %p\n", page);
896
897 if (remove_page)
898 generic_error_remove_page(inode->i_mapping,
899 page);
900
901 unlock_page(page);
902 }
903 dout("writepages_finish %p wrote %llu bytes cleaned %d pages\n",
904 inode, osd_data->length, rc >= 0 ? num_pages : 0);
905
906 release_pages(osd_data->pages, num_pages);
907 }
908
909 ceph_update_write_metrics(&fsc->mdsc->metric, req->r_start_latency,
910 req->r_end_latency, len, rc);
911
912 ceph_put_wrbuffer_cap_refs(ci, total_pages, snapc);
913
914 osd_data = osd_req_op_extent_osd_data(req, 0);
915 if (osd_data->pages_from_pool)
916 mempool_free(osd_data->pages, ceph_wb_pagevec_pool);
917 else
918 kfree(osd_data->pages);
919 ceph_osdc_put_request(req);
920 ceph_dec_osd_stopping_blocker(fsc->mdsc);
921 }
922
923 /*
924 * initiate async writeback
925 */
ceph_writepages_start(struct address_space * mapping,struct writeback_control * wbc)926 static int ceph_writepages_start(struct address_space *mapping,
927 struct writeback_control *wbc)
928 {
929 struct inode *inode = mapping->host;
930 struct ceph_inode_info *ci = ceph_inode(inode);
931 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
932 struct ceph_vino vino = ceph_vino(inode);
933 pgoff_t index, start_index, end = -1;
934 struct ceph_snap_context *snapc = NULL, *last_snapc = NULL, *pgsnapc;
935 struct folio_batch fbatch;
936 int rc = 0;
937 unsigned int wsize = i_blocksize(inode);
938 struct ceph_osd_request *req = NULL;
939 struct ceph_writeback_ctl ceph_wbc;
940 bool should_loop, range_whole = false;
941 bool done = false;
942 bool caching = ceph_is_cache_enabled(inode);
943 xa_mark_t tag;
944
945 if (wbc->sync_mode == WB_SYNC_NONE &&
946 fsc->write_congested)
947 return 0;
948
949 dout("writepages_start %p (mode=%s)\n", inode,
950 wbc->sync_mode == WB_SYNC_NONE ? "NONE" :
951 (wbc->sync_mode == WB_SYNC_ALL ? "ALL" : "HOLD"));
952
953 if (ceph_inode_is_shutdown(inode)) {
954 if (ci->i_wrbuffer_ref > 0) {
955 pr_warn_ratelimited(
956 "writepage_start %p %lld forced umount\n",
957 inode, ceph_ino(inode));
958 }
959 mapping_set_error(mapping, -EIO);
960 return -EIO; /* we're in a forced umount, don't write! */
961 }
962 if (fsc->mount_options->wsize < wsize)
963 wsize = fsc->mount_options->wsize;
964
965 folio_batch_init(&fbatch);
966
967 start_index = wbc->range_cyclic ? mapping->writeback_index : 0;
968 index = start_index;
969
970 if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages) {
971 tag = PAGECACHE_TAG_TOWRITE;
972 } else {
973 tag = PAGECACHE_TAG_DIRTY;
974 }
975 retry:
976 /* find oldest snap context with dirty data */
977 snapc = get_oldest_context(inode, &ceph_wbc, NULL);
978 if (!snapc) {
979 /* hmm, why does writepages get called when there
980 is no dirty data? */
981 dout(" no snap context with dirty data?\n");
982 goto out;
983 }
984 dout(" oldest snapc is %p seq %lld (%d snaps)\n",
985 snapc, snapc->seq, snapc->num_snaps);
986
987 should_loop = false;
988 if (ceph_wbc.head_snapc && snapc != last_snapc) {
989 /* where to start/end? */
990 if (wbc->range_cyclic) {
991 index = start_index;
992 end = -1;
993 if (index > 0)
994 should_loop = true;
995 dout(" cyclic, start at %lu\n", index);
996 } else {
997 index = wbc->range_start >> PAGE_SHIFT;
998 end = wbc->range_end >> PAGE_SHIFT;
999 if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
1000 range_whole = true;
1001 dout(" not cyclic, %lu to %lu\n", index, end);
1002 }
1003 } else if (!ceph_wbc.head_snapc) {
1004 /* Do not respect wbc->range_{start,end}. Dirty pages
1005 * in that range can be associated with newer snapc.
1006 * They are not writeable until we write all dirty pages
1007 * associated with 'snapc' get written */
1008 if (index > 0)
1009 should_loop = true;
1010 dout(" non-head snapc, range whole\n");
1011 }
1012
1013 if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages)
1014 tag_pages_for_writeback(mapping, index, end);
1015
1016 ceph_put_snap_context(last_snapc);
1017 last_snapc = snapc;
1018
1019 while (!done && index <= end) {
1020 int num_ops = 0, op_idx;
1021 unsigned i, nr_folios, max_pages, locked_pages = 0;
1022 struct page **pages = NULL, **data_pages;
1023 struct page *page;
1024 pgoff_t strip_unit_end = 0;
1025 u64 offset = 0, len = 0;
1026 bool from_pool = false;
1027
1028 max_pages = wsize >> PAGE_SHIFT;
1029
1030 get_more_pages:
1031 nr_folios = filemap_get_folios_tag(mapping, &index,
1032 end, tag, &fbatch);
1033 dout("pagevec_lookup_range_tag got %d\n", nr_folios);
1034 if (!nr_folios && !locked_pages)
1035 break;
1036 for (i = 0; i < nr_folios && locked_pages < max_pages; i++) {
1037 page = &fbatch.folios[i]->page;
1038 dout("? %p idx %lu\n", page, page->index);
1039 if (locked_pages == 0)
1040 lock_page(page); /* first page */
1041 else if (!trylock_page(page))
1042 break;
1043
1044 /* only dirty pages, or our accounting breaks */
1045 if (unlikely(!PageDirty(page)) ||
1046 unlikely(page->mapping != mapping)) {
1047 dout("!dirty or !mapping %p\n", page);
1048 unlock_page(page);
1049 continue;
1050 }
1051 /* only if matching snap context */
1052 pgsnapc = page_snap_context(page);
1053 if (pgsnapc != snapc) {
1054 dout("page snapc %p %lld != oldest %p %lld\n",
1055 pgsnapc, pgsnapc->seq, snapc, snapc->seq);
1056 if (!should_loop &&
1057 !ceph_wbc.head_snapc &&
1058 wbc->sync_mode != WB_SYNC_NONE)
1059 should_loop = true;
1060 unlock_page(page);
1061 continue;
1062 }
1063 if (page_offset(page) >= ceph_wbc.i_size) {
1064 struct folio *folio = page_folio(page);
1065
1066 dout("folio at %lu beyond eof %llu\n",
1067 folio->index, ceph_wbc.i_size);
1068 if ((ceph_wbc.size_stable ||
1069 folio_pos(folio) >= i_size_read(inode)) &&
1070 folio_clear_dirty_for_io(folio))
1071 folio_invalidate(folio, 0,
1072 folio_size(folio));
1073 folio_unlock(folio);
1074 continue;
1075 }
1076 if (strip_unit_end && (page->index > strip_unit_end)) {
1077 dout("end of strip unit %p\n", page);
1078 unlock_page(page);
1079 break;
1080 }
1081 if (PageWriteback(page) || PageFsCache(page)) {
1082 if (wbc->sync_mode == WB_SYNC_NONE) {
1083 dout("%p under writeback\n", page);
1084 unlock_page(page);
1085 continue;
1086 }
1087 dout("waiting on writeback %p\n", page);
1088 wait_on_page_writeback(page);
1089 wait_on_page_fscache(page);
1090 }
1091
1092 if (!clear_page_dirty_for_io(page)) {
1093 dout("%p !clear_page_dirty_for_io\n", page);
1094 unlock_page(page);
1095 continue;
1096 }
1097
1098 /*
1099 * We have something to write. If this is
1100 * the first locked page this time through,
1101 * calculate max possinle write size and
1102 * allocate a page array
1103 */
1104 if (locked_pages == 0) {
1105 u64 objnum;
1106 u64 objoff;
1107 u32 xlen;
1108
1109 /* prepare async write request */
1110 offset = (u64)page_offset(page);
1111 ceph_calc_file_object_mapping(&ci->i_layout,
1112 offset, wsize,
1113 &objnum, &objoff,
1114 &xlen);
1115 len = xlen;
1116
1117 num_ops = 1;
1118 strip_unit_end = page->index +
1119 ((len - 1) >> PAGE_SHIFT);
1120
1121 BUG_ON(pages);
1122 max_pages = calc_pages_for(0, (u64)len);
1123 pages = kmalloc_array(max_pages,
1124 sizeof(*pages),
1125 GFP_NOFS);
1126 if (!pages) {
1127 from_pool = true;
1128 pages = mempool_alloc(ceph_wb_pagevec_pool, GFP_NOFS);
1129 BUG_ON(!pages);
1130 }
1131
1132 len = 0;
1133 } else if (page->index !=
1134 (offset + len) >> PAGE_SHIFT) {
1135 if (num_ops >= (from_pool ? CEPH_OSD_SLAB_OPS :
1136 CEPH_OSD_MAX_OPS)) {
1137 redirty_page_for_writepage(wbc, page);
1138 unlock_page(page);
1139 break;
1140 }
1141
1142 num_ops++;
1143 offset = (u64)page_offset(page);
1144 len = 0;
1145 }
1146
1147 /* note position of first page in fbatch */
1148 dout("%p will write page %p idx %lu\n",
1149 inode, page, page->index);
1150
1151 if (atomic_long_inc_return(&fsc->writeback_count) >
1152 CONGESTION_ON_THRESH(
1153 fsc->mount_options->congestion_kb))
1154 fsc->write_congested = true;
1155
1156 if (IS_ENCRYPTED(inode)) {
1157 pages[locked_pages] =
1158 fscrypt_encrypt_pagecache_blocks(page,
1159 PAGE_SIZE, 0,
1160 locked_pages ? GFP_NOWAIT : GFP_NOFS);
1161 if (IS_ERR(pages[locked_pages])) {
1162 if (PTR_ERR(pages[locked_pages]) == -EINVAL)
1163 pr_err("%s: inode->i_blkbits=%hhu\n",
1164 __func__, inode->i_blkbits);
1165 /* better not fail on first page! */
1166 BUG_ON(locked_pages == 0);
1167 pages[locked_pages] = NULL;
1168 redirty_page_for_writepage(wbc, page);
1169 unlock_page(page);
1170 break;
1171 }
1172 ++locked_pages;
1173 } else {
1174 pages[locked_pages++] = page;
1175 }
1176
1177 fbatch.folios[i] = NULL;
1178 len += thp_size(page);
1179 }
1180
1181 /* did we get anything? */
1182 if (!locked_pages)
1183 goto release_folios;
1184 if (i) {
1185 unsigned j, n = 0;
1186 /* shift unused page to beginning of fbatch */
1187 for (j = 0; j < nr_folios; j++) {
1188 if (!fbatch.folios[j])
1189 continue;
1190 if (n < j)
1191 fbatch.folios[n] = fbatch.folios[j];
1192 n++;
1193 }
1194 fbatch.nr = n;
1195
1196 if (nr_folios && i == nr_folios &&
1197 locked_pages < max_pages) {
1198 dout("reached end fbatch, trying for more\n");
1199 folio_batch_release(&fbatch);
1200 goto get_more_pages;
1201 }
1202 }
1203
1204 new_request:
1205 offset = ceph_fscrypt_page_offset(pages[0]);
1206 len = wsize;
1207
1208 req = ceph_osdc_new_request(&fsc->client->osdc,
1209 &ci->i_layout, vino,
1210 offset, &len, 0, num_ops,
1211 CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE,
1212 snapc, ceph_wbc.truncate_seq,
1213 ceph_wbc.truncate_size, false);
1214 if (IS_ERR(req)) {
1215 req = ceph_osdc_new_request(&fsc->client->osdc,
1216 &ci->i_layout, vino,
1217 offset, &len, 0,
1218 min(num_ops,
1219 CEPH_OSD_SLAB_OPS),
1220 CEPH_OSD_OP_WRITE,
1221 CEPH_OSD_FLAG_WRITE,
1222 snapc, ceph_wbc.truncate_seq,
1223 ceph_wbc.truncate_size, true);
1224 BUG_ON(IS_ERR(req));
1225 }
1226 BUG_ON(len < ceph_fscrypt_page_offset(pages[locked_pages - 1]) +
1227 thp_size(pages[locked_pages - 1]) - offset);
1228
1229 if (!ceph_inc_osd_stopping_blocker(fsc->mdsc)) {
1230 rc = -EIO;
1231 goto release_folios;
1232 }
1233 req->r_callback = writepages_finish;
1234 req->r_inode = inode;
1235
1236 /* Format the osd request message and submit the write */
1237 len = 0;
1238 data_pages = pages;
1239 op_idx = 0;
1240 for (i = 0; i < locked_pages; i++) {
1241 struct page *page = ceph_fscrypt_pagecache_page(pages[i]);
1242
1243 u64 cur_offset = page_offset(page);
1244 /*
1245 * Discontinuity in page range? Ceph can handle that by just passing
1246 * multiple extents in the write op.
1247 */
1248 if (offset + len != cur_offset) {
1249 /* If it's full, stop here */
1250 if (op_idx + 1 == req->r_num_ops)
1251 break;
1252
1253 /* Kick off an fscache write with what we have so far. */
1254 ceph_fscache_write_to_cache(inode, offset, len, caching);
1255
1256 /* Start a new extent */
1257 osd_req_op_extent_dup_last(req, op_idx,
1258 cur_offset - offset);
1259 dout("writepages got pages at %llu~%llu\n",
1260 offset, len);
1261 osd_req_op_extent_osd_data_pages(req, op_idx,
1262 data_pages, len, 0,
1263 from_pool, false);
1264 osd_req_op_extent_update(req, op_idx, len);
1265
1266 len = 0;
1267 offset = cur_offset;
1268 data_pages = pages + i;
1269 op_idx++;
1270 }
1271
1272 set_page_writeback(page);
1273 if (caching)
1274 ceph_set_page_fscache(page);
1275 len += thp_size(page);
1276 }
1277 ceph_fscache_write_to_cache(inode, offset, len, caching);
1278
1279 if (ceph_wbc.size_stable) {
1280 len = min(len, ceph_wbc.i_size - offset);
1281 } else if (i == locked_pages) {
1282 /* writepages_finish() clears writeback pages
1283 * according to the data length, so make sure
1284 * data length covers all locked pages */
1285 u64 min_len = len + 1 - thp_size(page);
1286 len = get_writepages_data_length(inode, pages[i - 1],
1287 offset);
1288 len = max(len, min_len);
1289 }
1290 if (IS_ENCRYPTED(inode))
1291 len = round_up(len, CEPH_FSCRYPT_BLOCK_SIZE);
1292
1293 dout("writepages got pages at %llu~%llu\n", offset, len);
1294
1295 if (IS_ENCRYPTED(inode) &&
1296 ((offset | len) & ~CEPH_FSCRYPT_BLOCK_MASK))
1297 pr_warn("%s: bad encrypted write offset=%lld len=%llu\n",
1298 __func__, offset, len);
1299
1300 osd_req_op_extent_osd_data_pages(req, op_idx, data_pages, len,
1301 0, from_pool, false);
1302 osd_req_op_extent_update(req, op_idx, len);
1303
1304 BUG_ON(op_idx + 1 != req->r_num_ops);
1305
1306 from_pool = false;
1307 if (i < locked_pages) {
1308 BUG_ON(num_ops <= req->r_num_ops);
1309 num_ops -= req->r_num_ops;
1310 locked_pages -= i;
1311
1312 /* allocate new pages array for next request */
1313 data_pages = pages;
1314 pages = kmalloc_array(locked_pages, sizeof(*pages),
1315 GFP_NOFS);
1316 if (!pages) {
1317 from_pool = true;
1318 pages = mempool_alloc(ceph_wb_pagevec_pool, GFP_NOFS);
1319 BUG_ON(!pages);
1320 }
1321 memcpy(pages, data_pages + i,
1322 locked_pages * sizeof(*pages));
1323 memset(data_pages + i, 0,
1324 locked_pages * sizeof(*pages));
1325 } else {
1326 BUG_ON(num_ops != req->r_num_ops);
1327 index = pages[i - 1]->index + 1;
1328 /* request message now owns the pages array */
1329 pages = NULL;
1330 }
1331
1332 req->r_mtime = inode->i_mtime;
1333 ceph_osdc_start_request(&fsc->client->osdc, req);
1334 req = NULL;
1335
1336 wbc->nr_to_write -= i;
1337 if (pages)
1338 goto new_request;
1339
1340 /*
1341 * We stop writing back only if we are not doing
1342 * integrity sync. In case of integrity sync we have to
1343 * keep going until we have written all the pages
1344 * we tagged for writeback prior to entering this loop.
1345 */
1346 if (wbc->nr_to_write <= 0 && wbc->sync_mode == WB_SYNC_NONE)
1347 done = true;
1348
1349 release_folios:
1350 dout("folio_batch release on %d folios (%p)\n", (int)fbatch.nr,
1351 fbatch.nr ? fbatch.folios[0] : NULL);
1352 folio_batch_release(&fbatch);
1353 }
1354
1355 if (should_loop && !done) {
1356 /* more to do; loop back to beginning of file */
1357 dout("writepages looping back to beginning of file\n");
1358 end = start_index - 1; /* OK even when start_index == 0 */
1359
1360 /* to write dirty pages associated with next snapc,
1361 * we need to wait until current writes complete */
1362 if (wbc->sync_mode != WB_SYNC_NONE &&
1363 start_index == 0 && /* all dirty pages were checked */
1364 !ceph_wbc.head_snapc) {
1365 struct page *page;
1366 unsigned i, nr;
1367 index = 0;
1368 while ((index <= end) &&
1369 (nr = filemap_get_folios_tag(mapping, &index,
1370 (pgoff_t)-1,
1371 PAGECACHE_TAG_WRITEBACK,
1372 &fbatch))) {
1373 for (i = 0; i < nr; i++) {
1374 page = &fbatch.folios[i]->page;
1375 if (page_snap_context(page) != snapc)
1376 continue;
1377 wait_on_page_writeback(page);
1378 }
1379 folio_batch_release(&fbatch);
1380 cond_resched();
1381 }
1382 }
1383
1384 start_index = 0;
1385 index = 0;
1386 goto retry;
1387 }
1388
1389 if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
1390 mapping->writeback_index = index;
1391
1392 out:
1393 ceph_osdc_put_request(req);
1394 ceph_put_snap_context(last_snapc);
1395 dout("writepages dend - startone, rc = %d\n", rc);
1396 return rc;
1397 }
1398
1399
1400
1401 /*
1402 * See if a given @snapc is either writeable, or already written.
1403 */
context_is_writeable_or_written(struct inode * inode,struct ceph_snap_context * snapc)1404 static int context_is_writeable_or_written(struct inode *inode,
1405 struct ceph_snap_context *snapc)
1406 {
1407 struct ceph_snap_context *oldest = get_oldest_context(inode, NULL, NULL);
1408 int ret = !oldest || snapc->seq <= oldest->seq;
1409
1410 ceph_put_snap_context(oldest);
1411 return ret;
1412 }
1413
1414 /**
1415 * ceph_find_incompatible - find an incompatible context and return it
1416 * @page: page being dirtied
1417 *
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.
1422 *
1423 * Must be called with page lock held.
1424 */
1425 static struct ceph_snap_context *
ceph_find_incompatible(struct page * page)1426 ceph_find_incompatible(struct page *page)
1427 {
1428 struct inode *inode = page->mapping->host;
1429 struct ceph_inode_info *ci = ceph_inode(inode);
1430
1431 if (ceph_inode_is_shutdown(inode)) {
1432 dout(" page %p %llx:%llx is shutdown\n", page,
1433 ceph_vinop(inode));
1434 return ERR_PTR(-ESTALE);
1435 }
1436
1437 for (;;) {
1438 struct ceph_snap_context *snapc, *oldest;
1439
1440 wait_on_page_writeback(page);
1441
1442 snapc = page_snap_context(page);
1443 if (!snapc || snapc == ci->i_head_snapc)
1444 break;
1445
1446 /*
1447 * this page is already dirty in another (older) snap
1448 * context! is it writeable now?
1449 */
1450 oldest = get_oldest_context(inode, NULL, NULL);
1451 if (snapc->seq > oldest->seq) {
1452 /* not writeable -- return it for the caller to deal with */
1453 ceph_put_snap_context(oldest);
1454 dout(" page %p snapc %p not current or oldest\n", page, snapc);
1455 return ceph_get_snap_context(snapc);
1456 }
1457 ceph_put_snap_context(oldest);
1458
1459 /* yay, writeable, do it now (without dropping page lock) */
1460 dout(" page %p snapc %p not current, but oldest\n", page, snapc);
1461 if (clear_page_dirty_for_io(page)) {
1462 int r = writepage_nounlock(page, NULL);
1463 if (r < 0)
1464 return ERR_PTR(r);
1465 }
1466 }
1467 return NULL;
1468 }
1469
ceph_netfs_check_write_begin(struct file * file,loff_t pos,unsigned int len,struct folio ** foliop,void ** _fsdata)1470 static int ceph_netfs_check_write_begin(struct file *file, loff_t pos, unsigned int len,
1471 struct folio **foliop, void **_fsdata)
1472 {
1473 struct inode *inode = file_inode(file);
1474 struct ceph_inode_info *ci = ceph_inode(inode);
1475 struct ceph_snap_context *snapc;
1476
1477 snapc = ceph_find_incompatible(folio_page(*foliop, 0));
1478 if (snapc) {
1479 int r;
1480
1481 folio_unlock(*foliop);
1482 folio_put(*foliop);
1483 *foliop = NULL;
1484 if (IS_ERR(snapc))
1485 return PTR_ERR(snapc);
1486
1487 ceph_queue_writeback(inode);
1488 r = wait_event_killable(ci->i_cap_wq,
1489 context_is_writeable_or_written(inode, snapc));
1490 ceph_put_snap_context(snapc);
1491 return r == 0 ? -EAGAIN : r;
1492 }
1493 return 0;
1494 }
1495
1496 /*
1497 * We are only allowed to write into/dirty the page if the page is
1498 * clean, or already dirty within the same snap context.
1499 */
ceph_write_begin(struct file * file,struct address_space * mapping,loff_t pos,unsigned len,struct page ** pagep,void ** fsdata)1500 static int ceph_write_begin(struct file *file, struct address_space *mapping,
1501 loff_t pos, unsigned len,
1502 struct page **pagep, void **fsdata)
1503 {
1504 struct inode *inode = file_inode(file);
1505 struct ceph_inode_info *ci = ceph_inode(inode);
1506 struct folio *folio = NULL;
1507 int r;
1508
1509 r = netfs_write_begin(&ci->netfs, file, inode->i_mapping, pos, len, &folio, NULL);
1510 if (r < 0)
1511 return r;
1512
1513 folio_wait_fscache(folio);
1514 WARN_ON_ONCE(!folio_test_locked(folio));
1515 *pagep = &folio->page;
1516 return 0;
1517 }
1518
1519 /*
1520 * we don't do anything in here that simple_write_end doesn't do
1521 * except adjust dirty page accounting
1522 */
ceph_write_end(struct file * file,struct address_space * mapping,loff_t pos,unsigned len,unsigned copied,struct page * subpage,void * fsdata)1523 static int ceph_write_end(struct file *file, struct address_space *mapping,
1524 loff_t pos, unsigned len, unsigned copied,
1525 struct page *subpage, void *fsdata)
1526 {
1527 struct folio *folio = page_folio(subpage);
1528 struct inode *inode = file_inode(file);
1529 bool check_cap = false;
1530
1531 dout("write_end file %p inode %p folio %p %d~%d (%d)\n", file,
1532 inode, folio, (int)pos, (int)copied, (int)len);
1533
1534 if (!folio_test_uptodate(folio)) {
1535 /* just return that nothing was copied on a short copy */
1536 if (copied < len) {
1537 copied = 0;
1538 goto out;
1539 }
1540 folio_mark_uptodate(folio);
1541 }
1542
1543 /* did file size increase? */
1544 if (pos+copied > i_size_read(inode))
1545 check_cap = ceph_inode_set_size(inode, pos+copied);
1546
1547 folio_mark_dirty(folio);
1548
1549 out:
1550 folio_unlock(folio);
1551 folio_put(folio);
1552
1553 if (check_cap)
1554 ceph_check_caps(ceph_inode(inode), CHECK_CAPS_AUTHONLY);
1555
1556 return copied;
1557 }
1558
1559 const struct address_space_operations ceph_aops = {
1560 .read_folio = netfs_read_folio,
1561 .readahead = netfs_readahead,
1562 .writepage = ceph_writepage,
1563 .writepages = ceph_writepages_start,
1564 .write_begin = ceph_write_begin,
1565 .write_end = ceph_write_end,
1566 .dirty_folio = ceph_dirty_folio,
1567 .invalidate_folio = ceph_invalidate_folio,
1568 .release_folio = ceph_release_folio,
1569 .direct_IO = noop_direct_IO,
1570 };
1571
ceph_block_sigs(sigset_t * oldset)1572 static void ceph_block_sigs(sigset_t *oldset)
1573 {
1574 sigset_t mask;
1575 siginitsetinv(&mask, sigmask(SIGKILL));
1576 sigprocmask(SIG_BLOCK, &mask, oldset);
1577 }
1578
ceph_restore_sigs(sigset_t * oldset)1579 static void ceph_restore_sigs(sigset_t *oldset)
1580 {
1581 sigprocmask(SIG_SETMASK, oldset, NULL);
1582 }
1583
1584 /*
1585 * vm ops
1586 */
ceph_filemap_fault(struct vm_fault * vmf)1587 static vm_fault_t ceph_filemap_fault(struct vm_fault *vmf)
1588 {
1589 struct vm_area_struct *vma = vmf->vma;
1590 struct inode *inode = file_inode(vma->vm_file);
1591 struct ceph_inode_info *ci = ceph_inode(inode);
1592 struct ceph_file_info *fi = vma->vm_file->private_data;
1593 loff_t off = (loff_t)vmf->pgoff << PAGE_SHIFT;
1594 int want, got, err;
1595 sigset_t oldset;
1596 vm_fault_t ret = VM_FAULT_SIGBUS;
1597
1598 if (ceph_inode_is_shutdown(inode))
1599 return ret;
1600
1601 ceph_block_sigs(&oldset);
1602
1603 dout("filemap_fault %p %llx.%llx %llu trying to get caps\n",
1604 inode, ceph_vinop(inode), off);
1605 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1606 want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
1607 else
1608 want = CEPH_CAP_FILE_CACHE;
1609
1610 got = 0;
1611 err = ceph_get_caps(vma->vm_file, CEPH_CAP_FILE_RD, want, -1, &got);
1612 if (err < 0)
1613 goto out_restore;
1614
1615 dout("filemap_fault %p %llu got cap refs on %s\n",
1616 inode, off, ceph_cap_string(got));
1617
1618 if ((got & (CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO)) ||
1619 !ceph_has_inline_data(ci)) {
1620 CEPH_DEFINE_RW_CONTEXT(rw_ctx, got);
1621 ceph_add_rw_context(fi, &rw_ctx);
1622 ret = filemap_fault(vmf);
1623 ceph_del_rw_context(fi, &rw_ctx);
1624 dout("filemap_fault %p %llu drop cap refs %s ret %x\n",
1625 inode, off, ceph_cap_string(got), ret);
1626 } else
1627 err = -EAGAIN;
1628
1629 ceph_put_cap_refs(ci, got);
1630
1631 if (err != -EAGAIN)
1632 goto out_restore;
1633
1634 /* read inline data */
1635 if (off >= PAGE_SIZE) {
1636 /* does not support inline data > PAGE_SIZE */
1637 ret = VM_FAULT_SIGBUS;
1638 } else {
1639 struct address_space *mapping = inode->i_mapping;
1640 struct page *page;
1641
1642 filemap_invalidate_lock_shared(mapping);
1643 page = find_or_create_page(mapping, 0,
1644 mapping_gfp_constraint(mapping, ~__GFP_FS));
1645 if (!page) {
1646 ret = VM_FAULT_OOM;
1647 goto out_inline;
1648 }
1649 err = __ceph_do_getattr(inode, page,
1650 CEPH_STAT_CAP_INLINE_DATA, true);
1651 if (err < 0 || off >= i_size_read(inode)) {
1652 unlock_page(page);
1653 put_page(page);
1654 ret = vmf_error(err);
1655 goto out_inline;
1656 }
1657 if (err < PAGE_SIZE)
1658 zero_user_segment(page, err, PAGE_SIZE);
1659 else
1660 flush_dcache_page(page);
1661 SetPageUptodate(page);
1662 vmf->page = page;
1663 ret = VM_FAULT_MAJOR | VM_FAULT_LOCKED;
1664 out_inline:
1665 filemap_invalidate_unlock_shared(mapping);
1666 dout("filemap_fault %p %llu read inline data ret %x\n",
1667 inode, off, ret);
1668 }
1669 out_restore:
1670 ceph_restore_sigs(&oldset);
1671 if (err < 0)
1672 ret = vmf_error(err);
1673
1674 return ret;
1675 }
1676
ceph_page_mkwrite(struct vm_fault * vmf)1677 static vm_fault_t ceph_page_mkwrite(struct vm_fault *vmf)
1678 {
1679 struct vm_area_struct *vma = vmf->vma;
1680 struct inode *inode = file_inode(vma->vm_file);
1681 struct ceph_inode_info *ci = ceph_inode(inode);
1682 struct ceph_file_info *fi = vma->vm_file->private_data;
1683 struct ceph_cap_flush *prealloc_cf;
1684 struct page *page = vmf->page;
1685 loff_t off = page_offset(page);
1686 loff_t size = i_size_read(inode);
1687 size_t len;
1688 int want, got, err;
1689 sigset_t oldset;
1690 vm_fault_t ret = VM_FAULT_SIGBUS;
1691
1692 if (ceph_inode_is_shutdown(inode))
1693 return ret;
1694
1695 prealloc_cf = ceph_alloc_cap_flush();
1696 if (!prealloc_cf)
1697 return VM_FAULT_OOM;
1698
1699 sb_start_pagefault(inode->i_sb);
1700 ceph_block_sigs(&oldset);
1701
1702 if (off + thp_size(page) <= size)
1703 len = thp_size(page);
1704 else
1705 len = offset_in_thp(page, size);
1706
1707 dout("page_mkwrite %p %llx.%llx %llu~%zd getting caps i_size %llu\n",
1708 inode, ceph_vinop(inode), off, len, size);
1709 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1710 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
1711 else
1712 want = CEPH_CAP_FILE_BUFFER;
1713
1714 got = 0;
1715 err = ceph_get_caps(vma->vm_file, CEPH_CAP_FILE_WR, want, off + len, &got);
1716 if (err < 0)
1717 goto out_free;
1718
1719 dout("page_mkwrite %p %llu~%zd got cap refs on %s\n",
1720 inode, off, len, ceph_cap_string(got));
1721
1722 /* Update time before taking page lock */
1723 file_update_time(vma->vm_file);
1724 inode_inc_iversion_raw(inode);
1725
1726 do {
1727 struct ceph_snap_context *snapc;
1728
1729 lock_page(page);
1730
1731 if (page_mkwrite_check_truncate(page, inode) < 0) {
1732 unlock_page(page);
1733 ret = VM_FAULT_NOPAGE;
1734 break;
1735 }
1736
1737 snapc = ceph_find_incompatible(page);
1738 if (!snapc) {
1739 /* success. we'll keep the page locked. */
1740 set_page_dirty(page);
1741 ret = VM_FAULT_LOCKED;
1742 break;
1743 }
1744
1745 unlock_page(page);
1746
1747 if (IS_ERR(snapc)) {
1748 ret = VM_FAULT_SIGBUS;
1749 break;
1750 }
1751
1752 ceph_queue_writeback(inode);
1753 err = wait_event_killable(ci->i_cap_wq,
1754 context_is_writeable_or_written(inode, snapc));
1755 ceph_put_snap_context(snapc);
1756 } while (err == 0);
1757
1758 if (ret == VM_FAULT_LOCKED) {
1759 int dirty;
1760 spin_lock(&ci->i_ceph_lock);
1761 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
1762 &prealloc_cf);
1763 spin_unlock(&ci->i_ceph_lock);
1764 if (dirty)
1765 __mark_inode_dirty(inode, dirty);
1766 }
1767
1768 dout("page_mkwrite %p %llu~%zd dropping cap refs on %s ret %x\n",
1769 inode, off, len, ceph_cap_string(got), ret);
1770 ceph_put_cap_refs_async(ci, got);
1771 out_free:
1772 ceph_restore_sigs(&oldset);
1773 sb_end_pagefault(inode->i_sb);
1774 ceph_free_cap_flush(prealloc_cf);
1775 if (err < 0)
1776 ret = vmf_error(err);
1777 return ret;
1778 }
1779
ceph_fill_inline_data(struct inode * inode,struct page * locked_page,char * data,size_t len)1780 void ceph_fill_inline_data(struct inode *inode, struct page *locked_page,
1781 char *data, size_t len)
1782 {
1783 struct address_space *mapping = inode->i_mapping;
1784 struct page *page;
1785
1786 if (locked_page) {
1787 page = locked_page;
1788 } else {
1789 if (i_size_read(inode) == 0)
1790 return;
1791 page = find_or_create_page(mapping, 0,
1792 mapping_gfp_constraint(mapping,
1793 ~__GFP_FS));
1794 if (!page)
1795 return;
1796 if (PageUptodate(page)) {
1797 unlock_page(page);
1798 put_page(page);
1799 return;
1800 }
1801 }
1802
1803 dout("fill_inline_data %p %llx.%llx len %zu locked_page %p\n",
1804 inode, ceph_vinop(inode), len, locked_page);
1805
1806 if (len > 0) {
1807 void *kaddr = kmap_atomic(page);
1808 memcpy(kaddr, data, len);
1809 kunmap_atomic(kaddr);
1810 }
1811
1812 if (page != locked_page) {
1813 if (len < PAGE_SIZE)
1814 zero_user_segment(page, len, PAGE_SIZE);
1815 else
1816 flush_dcache_page(page);
1817
1818 SetPageUptodate(page);
1819 unlock_page(page);
1820 put_page(page);
1821 }
1822 }
1823
ceph_uninline_data(struct file * file)1824 int ceph_uninline_data(struct file *file)
1825 {
1826 struct inode *inode = file_inode(file);
1827 struct ceph_inode_info *ci = ceph_inode(inode);
1828 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
1829 struct ceph_osd_request *req = NULL;
1830 struct ceph_cap_flush *prealloc_cf = NULL;
1831 struct folio *folio = NULL;
1832 u64 inline_version = CEPH_INLINE_NONE;
1833 struct page *pages[1];
1834 int err = 0;
1835 u64 len;
1836
1837 spin_lock(&ci->i_ceph_lock);
1838 inline_version = ci->i_inline_version;
1839 spin_unlock(&ci->i_ceph_lock);
1840
1841 dout("uninline_data %p %llx.%llx inline_version %llu\n",
1842 inode, ceph_vinop(inode), inline_version);
1843
1844 if (ceph_inode_is_shutdown(inode)) {
1845 err = -EIO;
1846 goto out;
1847 }
1848
1849 if (inline_version == CEPH_INLINE_NONE)
1850 return 0;
1851
1852 prealloc_cf = ceph_alloc_cap_flush();
1853 if (!prealloc_cf)
1854 return -ENOMEM;
1855
1856 if (inline_version == 1) /* initial version, no data */
1857 goto out_uninline;
1858
1859 folio = read_mapping_folio(inode->i_mapping, 0, file);
1860 if (IS_ERR(folio)) {
1861 err = PTR_ERR(folio);
1862 goto out;
1863 }
1864
1865 folio_lock(folio);
1866
1867 len = i_size_read(inode);
1868 if (len > folio_size(folio))
1869 len = folio_size(folio);
1870
1871 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1872 ceph_vino(inode), 0, &len, 0, 1,
1873 CEPH_OSD_OP_CREATE, CEPH_OSD_FLAG_WRITE,
1874 NULL, 0, 0, false);
1875 if (IS_ERR(req)) {
1876 err = PTR_ERR(req);
1877 goto out_unlock;
1878 }
1879
1880 req->r_mtime = inode->i_mtime;
1881 ceph_osdc_start_request(&fsc->client->osdc, req);
1882 err = ceph_osdc_wait_request(&fsc->client->osdc, req);
1883 ceph_osdc_put_request(req);
1884 if (err < 0)
1885 goto out_unlock;
1886
1887 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1888 ceph_vino(inode), 0, &len, 1, 3,
1889 CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE,
1890 NULL, ci->i_truncate_seq,
1891 ci->i_truncate_size, false);
1892 if (IS_ERR(req)) {
1893 err = PTR_ERR(req);
1894 goto out_unlock;
1895 }
1896
1897 pages[0] = folio_page(folio, 0);
1898 osd_req_op_extent_osd_data_pages(req, 1, pages, len, 0, false, false);
1899
1900 {
1901 __le64 xattr_buf = cpu_to_le64(inline_version);
1902 err = osd_req_op_xattr_init(req, 0, CEPH_OSD_OP_CMPXATTR,
1903 "inline_version", &xattr_buf,
1904 sizeof(xattr_buf),
1905 CEPH_OSD_CMPXATTR_OP_GT,
1906 CEPH_OSD_CMPXATTR_MODE_U64);
1907 if (err)
1908 goto out_put_req;
1909 }
1910
1911 {
1912 char xattr_buf[32];
1913 int xattr_len = snprintf(xattr_buf, sizeof(xattr_buf),
1914 "%llu", inline_version);
1915 err = osd_req_op_xattr_init(req, 2, CEPH_OSD_OP_SETXATTR,
1916 "inline_version",
1917 xattr_buf, xattr_len, 0, 0);
1918 if (err)
1919 goto out_put_req;
1920 }
1921
1922 req->r_mtime = inode->i_mtime;
1923 ceph_osdc_start_request(&fsc->client->osdc, req);
1924 err = ceph_osdc_wait_request(&fsc->client->osdc, req);
1925
1926 ceph_update_write_metrics(&fsc->mdsc->metric, req->r_start_latency,
1927 req->r_end_latency, len, err);
1928
1929 out_uninline:
1930 if (!err) {
1931 int dirty;
1932
1933 /* Set to CAP_INLINE_NONE and dirty the caps */
1934 down_read(&fsc->mdsc->snap_rwsem);
1935 spin_lock(&ci->i_ceph_lock);
1936 ci->i_inline_version = CEPH_INLINE_NONE;
1937 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR, &prealloc_cf);
1938 spin_unlock(&ci->i_ceph_lock);
1939 up_read(&fsc->mdsc->snap_rwsem);
1940 if (dirty)
1941 __mark_inode_dirty(inode, dirty);
1942 }
1943 out_put_req:
1944 ceph_osdc_put_request(req);
1945 if (err == -ECANCELED)
1946 err = 0;
1947 out_unlock:
1948 if (folio) {
1949 folio_unlock(folio);
1950 folio_put(folio);
1951 }
1952 out:
1953 ceph_free_cap_flush(prealloc_cf);
1954 dout("uninline_data %p %llx.%llx inline_version %llu = %d\n",
1955 inode, ceph_vinop(inode), inline_version, err);
1956 return err;
1957 }
1958
1959 static const struct vm_operations_struct ceph_vmops = {
1960 .fault = ceph_filemap_fault,
1961 .page_mkwrite = ceph_page_mkwrite,
1962 };
1963
ceph_mmap(struct file * file,struct vm_area_struct * vma)1964 int ceph_mmap(struct file *file, struct vm_area_struct *vma)
1965 {
1966 struct address_space *mapping = file->f_mapping;
1967
1968 if (!mapping->a_ops->read_folio)
1969 return -ENOEXEC;
1970 vma->vm_ops = &ceph_vmops;
1971 return 0;
1972 }
1973
1974 enum {
1975 POOL_READ = 1,
1976 POOL_WRITE = 2,
1977 };
1978
__ceph_pool_perm_get(struct ceph_inode_info * ci,s64 pool,struct ceph_string * pool_ns)1979 static int __ceph_pool_perm_get(struct ceph_inode_info *ci,
1980 s64 pool, struct ceph_string *pool_ns)
1981 {
1982 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(&ci->netfs.inode);
1983 struct ceph_mds_client *mdsc = fsc->mdsc;
1984 struct ceph_osd_request *rd_req = NULL, *wr_req = NULL;
1985 struct rb_node **p, *parent;
1986 struct ceph_pool_perm *perm;
1987 struct page **pages;
1988 size_t pool_ns_len;
1989 int err = 0, err2 = 0, have = 0;
1990
1991 down_read(&mdsc->pool_perm_rwsem);
1992 p = &mdsc->pool_perm_tree.rb_node;
1993 while (*p) {
1994 perm = rb_entry(*p, struct ceph_pool_perm, node);
1995 if (pool < perm->pool)
1996 p = &(*p)->rb_left;
1997 else if (pool > perm->pool)
1998 p = &(*p)->rb_right;
1999 else {
2000 int ret = ceph_compare_string(pool_ns,
2001 perm->pool_ns,
2002 perm->pool_ns_len);
2003 if (ret < 0)
2004 p = &(*p)->rb_left;
2005 else if (ret > 0)
2006 p = &(*p)->rb_right;
2007 else {
2008 have = perm->perm;
2009 break;
2010 }
2011 }
2012 }
2013 up_read(&mdsc->pool_perm_rwsem);
2014 if (*p)
2015 goto out;
2016
2017 if (pool_ns)
2018 dout("__ceph_pool_perm_get pool %lld ns %.*s no perm cached\n",
2019 pool, (int)pool_ns->len, pool_ns->str);
2020 else
2021 dout("__ceph_pool_perm_get pool %lld no perm cached\n", pool);
2022
2023 down_write(&mdsc->pool_perm_rwsem);
2024 p = &mdsc->pool_perm_tree.rb_node;
2025 parent = NULL;
2026 while (*p) {
2027 parent = *p;
2028 perm = rb_entry(parent, struct ceph_pool_perm, node);
2029 if (pool < perm->pool)
2030 p = &(*p)->rb_left;
2031 else if (pool > perm->pool)
2032 p = &(*p)->rb_right;
2033 else {
2034 int ret = ceph_compare_string(pool_ns,
2035 perm->pool_ns,
2036 perm->pool_ns_len);
2037 if (ret < 0)
2038 p = &(*p)->rb_left;
2039 else if (ret > 0)
2040 p = &(*p)->rb_right;
2041 else {
2042 have = perm->perm;
2043 break;
2044 }
2045 }
2046 }
2047 if (*p) {
2048 up_write(&mdsc->pool_perm_rwsem);
2049 goto out;
2050 }
2051
2052 rd_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL,
2053 1, false, GFP_NOFS);
2054 if (!rd_req) {
2055 err = -ENOMEM;
2056 goto out_unlock;
2057 }
2058
2059 rd_req->r_flags = CEPH_OSD_FLAG_READ;
2060 osd_req_op_init(rd_req, 0, CEPH_OSD_OP_STAT, 0);
2061 rd_req->r_base_oloc.pool = pool;
2062 if (pool_ns)
2063 rd_req->r_base_oloc.pool_ns = ceph_get_string(pool_ns);
2064 ceph_oid_printf(&rd_req->r_base_oid, "%llx.00000000", ci->i_vino.ino);
2065
2066 err = ceph_osdc_alloc_messages(rd_req, GFP_NOFS);
2067 if (err)
2068 goto out_unlock;
2069
2070 wr_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL,
2071 1, false, GFP_NOFS);
2072 if (!wr_req) {
2073 err = -ENOMEM;
2074 goto out_unlock;
2075 }
2076
2077 wr_req->r_flags = CEPH_OSD_FLAG_WRITE;
2078 osd_req_op_init(wr_req, 0, CEPH_OSD_OP_CREATE, CEPH_OSD_OP_FLAG_EXCL);
2079 ceph_oloc_copy(&wr_req->r_base_oloc, &rd_req->r_base_oloc);
2080 ceph_oid_copy(&wr_req->r_base_oid, &rd_req->r_base_oid);
2081
2082 err = ceph_osdc_alloc_messages(wr_req, GFP_NOFS);
2083 if (err)
2084 goto out_unlock;
2085
2086 /* one page should be large enough for STAT data */
2087 pages = ceph_alloc_page_vector(1, GFP_KERNEL);
2088 if (IS_ERR(pages)) {
2089 err = PTR_ERR(pages);
2090 goto out_unlock;
2091 }
2092
2093 osd_req_op_raw_data_in_pages(rd_req, 0, pages, PAGE_SIZE,
2094 0, false, true);
2095 ceph_osdc_start_request(&fsc->client->osdc, rd_req);
2096
2097 wr_req->r_mtime = ci->netfs.inode.i_mtime;
2098 ceph_osdc_start_request(&fsc->client->osdc, wr_req);
2099
2100 err = ceph_osdc_wait_request(&fsc->client->osdc, rd_req);
2101 err2 = ceph_osdc_wait_request(&fsc->client->osdc, wr_req);
2102
2103 if (err >= 0 || err == -ENOENT)
2104 have |= POOL_READ;
2105 else if (err != -EPERM) {
2106 if (err == -EBLOCKLISTED)
2107 fsc->blocklisted = true;
2108 goto out_unlock;
2109 }
2110
2111 if (err2 == 0 || err2 == -EEXIST)
2112 have |= POOL_WRITE;
2113 else if (err2 != -EPERM) {
2114 if (err2 == -EBLOCKLISTED)
2115 fsc->blocklisted = true;
2116 err = err2;
2117 goto out_unlock;
2118 }
2119
2120 pool_ns_len = pool_ns ? pool_ns->len : 0;
2121 perm = kmalloc(sizeof(*perm) + pool_ns_len + 1, GFP_NOFS);
2122 if (!perm) {
2123 err = -ENOMEM;
2124 goto out_unlock;
2125 }
2126
2127 perm->pool = pool;
2128 perm->perm = have;
2129 perm->pool_ns_len = pool_ns_len;
2130 if (pool_ns_len > 0)
2131 memcpy(perm->pool_ns, pool_ns->str, pool_ns_len);
2132 perm->pool_ns[pool_ns_len] = 0;
2133
2134 rb_link_node(&perm->node, parent, p);
2135 rb_insert_color(&perm->node, &mdsc->pool_perm_tree);
2136 err = 0;
2137 out_unlock:
2138 up_write(&mdsc->pool_perm_rwsem);
2139
2140 ceph_osdc_put_request(rd_req);
2141 ceph_osdc_put_request(wr_req);
2142 out:
2143 if (!err)
2144 err = have;
2145 if (pool_ns)
2146 dout("__ceph_pool_perm_get pool %lld ns %.*s result = %d\n",
2147 pool, (int)pool_ns->len, pool_ns->str, err);
2148 else
2149 dout("__ceph_pool_perm_get pool %lld result = %d\n", pool, err);
2150 return err;
2151 }
2152
ceph_pool_perm_check(struct inode * inode,int need)2153 int ceph_pool_perm_check(struct inode *inode, int need)
2154 {
2155 struct ceph_inode_info *ci = ceph_inode(inode);
2156 struct ceph_string *pool_ns;
2157 s64 pool;
2158 int ret, flags;
2159
2160 /* Only need to do this for regular files */
2161 if (!S_ISREG(inode->i_mode))
2162 return 0;
2163
2164 if (ci->i_vino.snap != CEPH_NOSNAP) {
2165 /*
2166 * Pool permission check needs to write to the first object.
2167 * But for snapshot, head of the first object may have alread
2168 * been deleted. Skip check to avoid creating orphan object.
2169 */
2170 return 0;
2171 }
2172
2173 if (ceph_test_mount_opt(ceph_inode_to_fs_client(inode),
2174 NOPOOLPERM))
2175 return 0;
2176
2177 spin_lock(&ci->i_ceph_lock);
2178 flags = ci->i_ceph_flags;
2179 pool = ci->i_layout.pool_id;
2180 spin_unlock(&ci->i_ceph_lock);
2181 check:
2182 if (flags & CEPH_I_POOL_PERM) {
2183 if ((need & CEPH_CAP_FILE_RD) && !(flags & CEPH_I_POOL_RD)) {
2184 dout("ceph_pool_perm_check pool %lld no read perm\n",
2185 pool);
2186 return -EPERM;
2187 }
2188 if ((need & CEPH_CAP_FILE_WR) && !(flags & CEPH_I_POOL_WR)) {
2189 dout("ceph_pool_perm_check pool %lld no write perm\n",
2190 pool);
2191 return -EPERM;
2192 }
2193 return 0;
2194 }
2195
2196 pool_ns = ceph_try_get_string(ci->i_layout.pool_ns);
2197 ret = __ceph_pool_perm_get(ci, pool, pool_ns);
2198 ceph_put_string(pool_ns);
2199 if (ret < 0)
2200 return ret;
2201
2202 flags = CEPH_I_POOL_PERM;
2203 if (ret & POOL_READ)
2204 flags |= CEPH_I_POOL_RD;
2205 if (ret & POOL_WRITE)
2206 flags |= CEPH_I_POOL_WR;
2207
2208 spin_lock(&ci->i_ceph_lock);
2209 if (pool == ci->i_layout.pool_id &&
2210 pool_ns == rcu_dereference_raw(ci->i_layout.pool_ns)) {
2211 ci->i_ceph_flags |= flags;
2212 } else {
2213 pool = ci->i_layout.pool_id;
2214 flags = ci->i_ceph_flags;
2215 }
2216 spin_unlock(&ci->i_ceph_lock);
2217 goto check;
2218 }
2219
ceph_pool_perm_destroy(struct ceph_mds_client * mdsc)2220 void ceph_pool_perm_destroy(struct ceph_mds_client *mdsc)
2221 {
2222 struct ceph_pool_perm *perm;
2223 struct rb_node *n;
2224
2225 while (!RB_EMPTY_ROOT(&mdsc->pool_perm_tree)) {
2226 n = rb_first(&mdsc->pool_perm_tree);
2227 perm = rb_entry(n, struct ceph_pool_perm, node);
2228 rb_erase(n, &mdsc->pool_perm_tree);
2229 kfree(perm);
2230 }
2231 }
2232