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 #include <trace/events/netfs.h>
17
18 #include "super.h"
19 #include "mds_client.h"
20 #include "cache.h"
21 #include "metric.h"
22 #include "crypto.h"
23 #include <linux/ceph/osd_client.h>
24 #include <linux/ceph/striper.h>
25
26 /*
27 * Ceph address space ops.
28 *
29 * There are a few funny things going on here.
30 *
31 * The page->private field is used to reference a struct
32 * ceph_snap_context for _every_ dirty page. This indicates which
33 * snapshot the page was logically dirtied in, and thus which snap
34 * context needs to be associated with the osd write during writeback.
35 *
36 * Similarly, struct ceph_inode_info maintains a set of counters to
37 * count dirty pages on the inode. In the absence of snapshots,
38 * i_wrbuffer_ref == i_wrbuffer_ref_head == the dirty page count.
39 *
40 * When a snapshot is taken (that is, when the client receives
41 * notification that a snapshot was taken), each inode with caps and
42 * with dirty pages (dirty pages implies there is a cap) gets a new
43 * ceph_cap_snap in the i_cap_snaps list (which is sorted in ascending
44 * order, new snaps go to the tail). The i_wrbuffer_ref_head count is
45 * moved to capsnap->dirty. (Unless a sync write is currently in
46 * progress. In that case, the capsnap is said to be "pending", new
47 * writes cannot start, and the capsnap isn't "finalized" until the
48 * write completes (or fails) and a final size/mtime for the inode for
49 * that snap can be settled upon.) i_wrbuffer_ref_head is reset to 0.
50 *
51 * On writeback, we must submit writes to the osd IN SNAP ORDER. So,
52 * we look for the first capsnap in i_cap_snaps and write out pages in
53 * that snap context _only_. Then we move on to the next capsnap,
54 * eventually reaching the "live" or "head" context (i.e., pages that
55 * are not yet snapped) and are writing the most recently dirtied
56 * pages.
57 *
58 * Invalidate and so forth must take care to ensure the dirty page
59 * accounting is preserved.
60 */
61
62 #define CONGESTION_ON_THRESH(congestion_kb) (congestion_kb >> (PAGE_SHIFT-10))
63 #define CONGESTION_OFF_THRESH(congestion_kb) \
64 (CONGESTION_ON_THRESH(congestion_kb) - \
65 (CONGESTION_ON_THRESH(congestion_kb) >> 2))
66
67 static int ceph_netfs_check_write_begin(struct file *file, loff_t pos, unsigned int len,
68 struct folio **foliop, void **_fsdata);
69
page_snap_context(struct page * page)70 static inline struct ceph_snap_context *page_snap_context(struct page *page)
71 {
72 if (PagePrivate(page))
73 return (void *)page->private;
74 return NULL;
75 }
76
77 /*
78 * Dirty a page. Optimistically adjust accounting, on the assumption
79 * that we won't race with invalidate. If we do, readjust.
80 */
ceph_dirty_folio(struct address_space * mapping,struct folio * folio)81 static bool ceph_dirty_folio(struct address_space *mapping, struct folio *folio)
82 {
83 struct inode *inode = mapping->host;
84 struct ceph_client *cl = ceph_inode_to_client(inode);
85 struct ceph_inode_info *ci;
86 struct ceph_snap_context *snapc;
87
88 if (folio_test_dirty(folio)) {
89 doutc(cl, "%llx.%llx %p idx %lu -- already dirty\n",
90 ceph_vinop(inode), folio, folio->index);
91 VM_BUG_ON_FOLIO(!folio_test_private(folio), folio);
92 return false;
93 }
94
95 ci = ceph_inode(inode);
96
97 /* dirty the head */
98 spin_lock(&ci->i_ceph_lock);
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 doutc(cl, "%llx.%llx %p idx %lu head %d/%d -> %d/%d "
115 "snapc %p seq %lld (%d snaps)\n",
116 ceph_vinop(inode), folio, folio->index,
117 ci->i_wrbuffer_ref-1, ci->i_wrbuffer_ref_head-1,
118 ci->i_wrbuffer_ref, ci->i_wrbuffer_ref_head,
119 snapc, snapc->seq, snapc->num_snaps);
120 spin_unlock(&ci->i_ceph_lock);
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 = folio->mapping->host;
141 struct ceph_client *cl = ceph_inode_to_client(inode);
142 struct ceph_inode_info *ci = ceph_inode(inode);
143 struct ceph_snap_context *snapc;
144
145
146 if (offset != 0 || length != folio_size(folio)) {
147 doutc(cl, "%llx.%llx idx %lu partial dirty page %zu~%zu\n",
148 ceph_vinop(inode), folio->index, offset, length);
149 return;
150 }
151
152 WARN_ON(!folio_test_locked(folio));
153 if (folio_test_private(folio)) {
154 doutc(cl, "%llx.%llx idx %lu full dirty page\n",
155 ceph_vinop(inode), folio->index);
156
157 snapc = folio_detach_private(folio);
158 ceph_put_wrbuffer_cap_refs(ci, 1, snapc);
159 ceph_put_snap_context(snapc);
160 }
161
162 netfs_invalidate_folio(folio, offset, length);
163 }
164
ceph_netfs_expand_readahead(struct netfs_io_request * rreq)165 static void ceph_netfs_expand_readahead(struct netfs_io_request *rreq)
166 {
167 struct inode *inode = rreq->inode;
168 struct ceph_inode_info *ci = ceph_inode(inode);
169 struct ceph_file_layout *lo = &ci->i_layout;
170 unsigned long max_pages = inode->i_sb->s_bdi->ra_pages;
171 loff_t end = rreq->start + rreq->len, new_end;
172 struct ceph_netfs_request_data *priv = rreq->netfs_priv;
173 unsigned long max_len;
174 u32 blockoff;
175
176 if (priv) {
177 /* Readahead is disabled by posix_fadvise POSIX_FADV_RANDOM */
178 if (priv->file_ra_disabled)
179 max_pages = 0;
180 else
181 max_pages = priv->file_ra_pages;
182
183 }
184
185 /* Readahead is disabled */
186 if (!max_pages)
187 return;
188
189 max_len = max_pages << PAGE_SHIFT;
190
191 /*
192 * Try to expand the length forward by rounding up it to the next
193 * block, but do not exceed the file size, unless the original
194 * request already exceeds it.
195 */
196 new_end = umin(round_up(end, lo->stripe_unit), rreq->i_size);
197 if (new_end > end && new_end <= rreq->start + max_len)
198 rreq->len = new_end - rreq->start;
199
200 /* Try to expand the start downward */
201 div_u64_rem(rreq->start, lo->stripe_unit, &blockoff);
202 if (rreq->len + blockoff <= max_len) {
203 rreq->start -= blockoff;
204 rreq->len += blockoff;
205 }
206 }
207
finish_netfs_read(struct ceph_osd_request * req)208 static void finish_netfs_read(struct ceph_osd_request *req)
209 {
210 struct inode *inode = req->r_inode;
211 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
212 struct ceph_client *cl = fsc->client;
213 struct ceph_osd_data *osd_data = osd_req_op_extent_osd_data(req, 0);
214 struct netfs_io_subrequest *subreq = req->r_priv;
215 struct ceph_osd_req_op *op = &req->r_ops[0];
216 int err = req->r_result;
217 bool sparse = (op->op == CEPH_OSD_OP_SPARSE_READ);
218
219 ceph_update_read_metrics(&fsc->mdsc->metric, req->r_start_latency,
220 req->r_end_latency, osd_data->length, err);
221
222 doutc(cl, "result %d subreq->len=%zu i_size=%lld\n", req->r_result,
223 subreq->len, i_size_read(req->r_inode));
224
225 /* no object means success but no data */
226 if (err == -ENOENT) {
227 __set_bit(NETFS_SREQ_CLEAR_TAIL, &subreq->flags);
228 __set_bit(NETFS_SREQ_MADE_PROGRESS, &subreq->flags);
229 err = 0;
230 } else if (err == -EBLOCKLISTED) {
231 fsc->blocklisted = true;
232 }
233
234 if (err >= 0) {
235 if (sparse && err > 0)
236 err = ceph_sparse_ext_map_end(op);
237 if (err < subreq->len &&
238 subreq->rreq->origin != NETFS_DIO_READ)
239 __set_bit(NETFS_SREQ_CLEAR_TAIL, &subreq->flags);
240 if (IS_ENCRYPTED(inode) && err > 0) {
241 err = ceph_fscrypt_decrypt_extents(inode,
242 osd_data->pages, subreq->start,
243 op->extent.sparse_ext,
244 op->extent.sparse_ext_cnt);
245 if (err > subreq->len)
246 err = subreq->len;
247 }
248 if (err > 0)
249 __set_bit(NETFS_SREQ_CLEAR_TAIL, &subreq->flags);
250 }
251
252 if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES) {
253 ceph_put_page_vector(osd_data->pages,
254 calc_pages_for(osd_data->alignment,
255 osd_data->length), false);
256 }
257 if (err > 0) {
258 subreq->transferred = err;
259 err = 0;
260 }
261 subreq->error = err;
262 trace_netfs_sreq(subreq, netfs_sreq_trace_io_progress);
263 netfs_read_subreq_terminated(subreq);
264 iput(req->r_inode);
265 ceph_dec_osd_stopping_blocker(fsc->mdsc);
266 }
267
ceph_netfs_issue_op_inline(struct netfs_io_subrequest * subreq)268 static bool ceph_netfs_issue_op_inline(struct netfs_io_subrequest *subreq)
269 {
270 struct netfs_io_request *rreq = subreq->rreq;
271 struct inode *inode = rreq->inode;
272 struct ceph_mds_reply_info_parsed *rinfo;
273 struct ceph_mds_reply_info_in *iinfo;
274 struct ceph_mds_request *req;
275 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
276 struct ceph_inode_info *ci = ceph_inode(inode);
277 ssize_t err = 0;
278 size_t len;
279 int mode;
280
281 if (rreq->origin != NETFS_DIO_READ)
282 __set_bit(NETFS_SREQ_CLEAR_TAIL, &subreq->flags);
283 __clear_bit(NETFS_SREQ_COPY_TO_CACHE, &subreq->flags);
284
285 if (subreq->start >= inode->i_size)
286 goto out;
287
288 /* We need to fetch the inline data. */
289 mode = ceph_try_to_choose_auth_mds(inode, CEPH_STAT_CAP_INLINE_DATA);
290 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, mode);
291 if (IS_ERR(req)) {
292 err = PTR_ERR(req);
293 goto out;
294 }
295 req->r_ino1 = ci->i_vino;
296 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INLINE_DATA);
297 req->r_num_caps = 2;
298
299 trace_netfs_sreq(subreq, netfs_sreq_trace_submit);
300 err = ceph_mdsc_do_request(mdsc, NULL, req);
301 if (err < 0)
302 goto out;
303
304 rinfo = &req->r_reply_info;
305 iinfo = &rinfo->targeti;
306 if (iinfo->inline_version == CEPH_INLINE_NONE) {
307 /* The data got uninlined */
308 ceph_mdsc_put_request(req);
309 return false;
310 }
311
312 len = min_t(size_t, iinfo->inline_len - subreq->start, subreq->len);
313 err = copy_to_iter(iinfo->inline_data + subreq->start, len, &subreq->io_iter);
314 if (err == 0) {
315 err = -EFAULT;
316 } else {
317 subreq->transferred += err;
318 err = 0;
319 }
320
321 ceph_mdsc_put_request(req);
322 out:
323 subreq->error = err;
324 trace_netfs_sreq(subreq, netfs_sreq_trace_io_progress);
325 netfs_read_subreq_terminated(subreq);
326 return true;
327 }
328
ceph_netfs_prepare_read(struct netfs_io_subrequest * subreq)329 static int ceph_netfs_prepare_read(struct netfs_io_subrequest *subreq)
330 {
331 struct netfs_io_request *rreq = subreq->rreq;
332 struct inode *inode = rreq->inode;
333 struct ceph_inode_info *ci = ceph_inode(inode);
334 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
335 u64 objno, objoff;
336 u32 xlen;
337
338 /* Truncate the extent at the end of the current block */
339 ceph_calc_file_object_mapping(&ci->i_layout, subreq->start, subreq->len,
340 &objno, &objoff, &xlen);
341 rreq->io_streams[0].sreq_max_len = umin(xlen, fsc->mount_options->rsize);
342 return 0;
343 }
344
ceph_netfs_issue_read(struct netfs_io_subrequest * subreq)345 static void ceph_netfs_issue_read(struct netfs_io_subrequest *subreq)
346 {
347 struct netfs_io_request *rreq = subreq->rreq;
348 struct inode *inode = rreq->inode;
349 struct ceph_inode_info *ci = ceph_inode(inode);
350 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
351 struct ceph_client *cl = fsc->client;
352 struct ceph_osd_request *req = NULL;
353 struct ceph_vino vino = ceph_vino(inode);
354 int err;
355 u64 len;
356 bool sparse = IS_ENCRYPTED(inode) || ceph_test_mount_opt(fsc, SPARSEREAD);
357 u64 off = subreq->start;
358 int extent_cnt;
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 // TODO: This rounding here is slightly dodgy. It *should* work, for
369 // now, as the cache only deals in blocks that are a multiple of
370 // PAGE_SIZE and fscrypt blocks are at most PAGE_SIZE. What needs to
371 // happen is for the fscrypt driving to be moved into netfslib and the
372 // data in the cache also to be stored encrypted.
373 len = subreq->len;
374 ceph_fscrypt_adjust_off_and_len(inode, &off, &len);
375
376 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, vino,
377 off, &len, 0, 1, sparse ? CEPH_OSD_OP_SPARSE_READ : CEPH_OSD_OP_READ,
378 CEPH_OSD_FLAG_READ, NULL, ci->i_truncate_seq,
379 ci->i_truncate_size, false);
380 if (IS_ERR(req)) {
381 err = PTR_ERR(req);
382 req = NULL;
383 goto out;
384 }
385
386 if (sparse) {
387 extent_cnt = __ceph_sparse_read_ext_count(inode, len);
388 err = ceph_alloc_sparse_ext_map(&req->r_ops[0], extent_cnt);
389 if (err)
390 goto out;
391 }
392
393 doutc(cl, "%llx.%llx pos=%llu orig_len=%zu len=%llu\n",
394 ceph_vinop(inode), subreq->start, subreq->len, len);
395
396 /*
397 * FIXME: For now, use CEPH_OSD_DATA_TYPE_PAGES instead of _ITER for
398 * encrypted inodes. We'd need infrastructure that handles an iov_iter
399 * instead of page arrays, and we don't have that as of yet. Once the
400 * dust settles on the write helpers and encrypt/decrypt routines for
401 * netfs, we should be able to rework this.
402 */
403 if (IS_ENCRYPTED(inode)) {
404 struct page **pages;
405 size_t page_off;
406
407 err = iov_iter_get_pages_alloc2(&subreq->io_iter, &pages, len, &page_off);
408 if (err < 0) {
409 doutc(cl, "%llx.%llx failed to allocate pages, %d\n",
410 ceph_vinop(inode), err);
411 goto out;
412 }
413
414 /* should always give us a page-aligned read */
415 WARN_ON_ONCE(page_off);
416 len = err;
417 err = 0;
418
419 osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0, false,
420 false);
421 } else {
422 osd_req_op_extent_osd_iter(req, 0, &subreq->io_iter);
423 }
424 if (!ceph_inc_osd_stopping_blocker(fsc->mdsc)) {
425 err = -EIO;
426 goto out;
427 }
428 req->r_callback = finish_netfs_read;
429 req->r_priv = subreq;
430 req->r_inode = inode;
431 ihold(inode);
432
433 trace_netfs_sreq(subreq, netfs_sreq_trace_submit);
434 ceph_osdc_start_request(req->r_osdc, req);
435 out:
436 ceph_osdc_put_request(req);
437 if (err) {
438 subreq->error = err;
439 netfs_read_subreq_terminated(subreq);
440 }
441 doutc(cl, "%llx.%llx result %d\n", ceph_vinop(inode), err);
442 }
443
ceph_init_request(struct netfs_io_request * rreq,struct file * file)444 static int ceph_init_request(struct netfs_io_request *rreq, struct file *file)
445 {
446 struct inode *inode = rreq->inode;
447 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
448 struct ceph_client *cl = ceph_inode_to_client(inode);
449 int got = 0, want = CEPH_CAP_FILE_CACHE;
450 struct ceph_netfs_request_data *priv;
451 int ret = 0;
452
453 /* [DEPRECATED] Use PG_private_2 to mark folio being written to the cache. */
454 __set_bit(NETFS_RREQ_USE_PGPRIV2, &rreq->flags);
455
456 if (rreq->origin != NETFS_READAHEAD)
457 return 0;
458
459 priv = kzalloc(sizeof(*priv), GFP_NOFS);
460 if (!priv)
461 return -ENOMEM;
462
463 if (file) {
464 struct ceph_rw_context *rw_ctx;
465 struct ceph_file_info *fi = file->private_data;
466
467 priv->file_ra_pages = file->f_ra.ra_pages;
468 priv->file_ra_disabled = file->f_mode & FMODE_RANDOM;
469
470 rw_ctx = ceph_find_rw_context(fi);
471 if (rw_ctx) {
472 rreq->netfs_priv = priv;
473 return 0;
474 }
475 }
476
477 /*
478 * readahead callers do not necessarily hold Fcb caps
479 * (e.g. fadvise, madvise).
480 */
481 ret = ceph_try_get_caps(inode, CEPH_CAP_FILE_RD, want, true, &got);
482 if (ret < 0) {
483 doutc(cl, "%llx.%llx, error getting cap\n", ceph_vinop(inode));
484 goto out;
485 }
486
487 if (!(got & want)) {
488 doutc(cl, "%llx.%llx, no cache cap\n", ceph_vinop(inode));
489 ret = -EACCES;
490 goto out;
491 }
492 if (ret == 0) {
493 ret = -EACCES;
494 goto out;
495 }
496
497 priv->caps = got;
498 rreq->netfs_priv = priv;
499 rreq->io_streams[0].sreq_max_len = fsc->mount_options->rsize;
500
501 out:
502 if (ret < 0) {
503 if (got)
504 ceph_put_cap_refs(ceph_inode(inode), got);
505 kfree(priv);
506 }
507
508 return ret;
509 }
510
ceph_netfs_free_request(struct netfs_io_request * rreq)511 static void ceph_netfs_free_request(struct netfs_io_request *rreq)
512 {
513 struct ceph_netfs_request_data *priv = rreq->netfs_priv;
514
515 if (!priv)
516 return;
517
518 if (priv->caps)
519 ceph_put_cap_refs(ceph_inode(rreq->inode), priv->caps);
520 kfree(priv);
521 rreq->netfs_priv = NULL;
522 }
523
524 const struct netfs_request_ops ceph_netfs_ops = {
525 .init_request = ceph_init_request,
526 .free_request = ceph_netfs_free_request,
527 .prepare_read = ceph_netfs_prepare_read,
528 .issue_read = ceph_netfs_issue_read,
529 .expand_readahead = ceph_netfs_expand_readahead,
530 .check_write_begin = ceph_netfs_check_write_begin,
531 };
532
533 #ifdef CONFIG_CEPH_FSCACHE
ceph_set_page_fscache(struct page * page)534 static void ceph_set_page_fscache(struct page *page)
535 {
536 folio_start_private_2(page_folio(page)); /* [DEPRECATED] */
537 }
538
ceph_fscache_write_terminated(void * priv,ssize_t error,bool was_async)539 static void ceph_fscache_write_terminated(void *priv, ssize_t error, bool was_async)
540 {
541 struct inode *inode = priv;
542
543 if (IS_ERR_VALUE(error) && error != -ENOBUFS)
544 ceph_fscache_invalidate(inode, false);
545 }
546
ceph_fscache_write_to_cache(struct inode * inode,u64 off,u64 len,bool caching)547 static void ceph_fscache_write_to_cache(struct inode *inode, u64 off, u64 len, bool caching)
548 {
549 struct ceph_inode_info *ci = ceph_inode(inode);
550 struct fscache_cookie *cookie = ceph_fscache_cookie(ci);
551
552 fscache_write_to_cache(cookie, inode->i_mapping, off, len, i_size_read(inode),
553 ceph_fscache_write_terminated, inode, true, caching);
554 }
555 #else
ceph_set_page_fscache(struct page * page)556 static inline void ceph_set_page_fscache(struct page *page)
557 {
558 }
559
ceph_fscache_write_to_cache(struct inode * inode,u64 off,u64 len,bool caching)560 static inline void ceph_fscache_write_to_cache(struct inode *inode, u64 off, u64 len, bool caching)
561 {
562 }
563 #endif /* CONFIG_CEPH_FSCACHE */
564
565 struct ceph_writeback_ctl
566 {
567 loff_t i_size;
568 u64 truncate_size;
569 u32 truncate_seq;
570 bool size_stable;
571 bool head_snapc;
572 };
573
574 /*
575 * Get ref for the oldest snapc for an inode with dirty data... that is, the
576 * only snap context we are allowed to write back.
577 */
578 static struct ceph_snap_context *
get_oldest_context(struct inode * inode,struct ceph_writeback_ctl * ctl,struct ceph_snap_context * page_snapc)579 get_oldest_context(struct inode *inode, struct ceph_writeback_ctl *ctl,
580 struct ceph_snap_context *page_snapc)
581 {
582 struct ceph_inode_info *ci = ceph_inode(inode);
583 struct ceph_client *cl = ceph_inode_to_client(inode);
584 struct ceph_snap_context *snapc = NULL;
585 struct ceph_cap_snap *capsnap = NULL;
586
587 spin_lock(&ci->i_ceph_lock);
588 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
589 doutc(cl, " capsnap %p snapc %p has %d dirty pages\n",
590 capsnap, capsnap->context, capsnap->dirty_pages);
591 if (!capsnap->dirty_pages)
592 continue;
593
594 /* get i_size, truncate_{seq,size} for page_snapc? */
595 if (snapc && capsnap->context != page_snapc)
596 continue;
597
598 if (ctl) {
599 if (capsnap->writing) {
600 ctl->i_size = i_size_read(inode);
601 ctl->size_stable = false;
602 } else {
603 ctl->i_size = capsnap->size;
604 ctl->size_stable = true;
605 }
606 ctl->truncate_size = capsnap->truncate_size;
607 ctl->truncate_seq = capsnap->truncate_seq;
608 ctl->head_snapc = false;
609 }
610
611 if (snapc)
612 break;
613
614 snapc = ceph_get_snap_context(capsnap->context);
615 if (!page_snapc ||
616 page_snapc == snapc ||
617 page_snapc->seq > snapc->seq)
618 break;
619 }
620 if (!snapc && ci->i_wrbuffer_ref_head) {
621 snapc = ceph_get_snap_context(ci->i_head_snapc);
622 doutc(cl, " head snapc %p has %d dirty pages\n", snapc,
623 ci->i_wrbuffer_ref_head);
624 if (ctl) {
625 ctl->i_size = i_size_read(inode);
626 ctl->truncate_size = ci->i_truncate_size;
627 ctl->truncate_seq = ci->i_truncate_seq;
628 ctl->size_stable = false;
629 ctl->head_snapc = true;
630 }
631 }
632 spin_unlock(&ci->i_ceph_lock);
633 return snapc;
634 }
635
get_writepages_data_length(struct inode * inode,struct page * page,u64 start)636 static u64 get_writepages_data_length(struct inode *inode,
637 struct page *page, u64 start)
638 {
639 struct ceph_inode_info *ci = ceph_inode(inode);
640 struct ceph_snap_context *snapc;
641 struct ceph_cap_snap *capsnap = NULL;
642 u64 end = i_size_read(inode);
643 u64 ret;
644
645 snapc = page_snap_context(ceph_fscrypt_pagecache_page(page));
646 if (snapc != ci->i_head_snapc) {
647 bool found = false;
648 spin_lock(&ci->i_ceph_lock);
649 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
650 if (capsnap->context == snapc) {
651 if (!capsnap->writing)
652 end = capsnap->size;
653 found = true;
654 break;
655 }
656 }
657 spin_unlock(&ci->i_ceph_lock);
658 WARN_ON(!found);
659 }
660 if (end > ceph_fscrypt_page_offset(page) + thp_size(page))
661 end = ceph_fscrypt_page_offset(page) + thp_size(page);
662 ret = end > start ? end - start : 0;
663 if (ret && fscrypt_is_bounce_page(page))
664 ret = round_up(ret, CEPH_FSCRYPT_BLOCK_SIZE);
665 return ret;
666 }
667
668 /*
669 * Write a single page, but leave the page locked.
670 *
671 * If we get a write error, mark the mapping for error, but still adjust the
672 * dirty page accounting (i.e., page is no longer dirty).
673 */
writepage_nounlock(struct page * page,struct writeback_control * wbc)674 static int writepage_nounlock(struct page *page, struct writeback_control *wbc)
675 {
676 struct folio *folio = page_folio(page);
677 struct inode *inode = page->mapping->host;
678 struct ceph_inode_info *ci = ceph_inode(inode);
679 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
680 struct ceph_client *cl = fsc->client;
681 struct ceph_snap_context *snapc, *oldest;
682 loff_t page_off = page_offset(page);
683 int err;
684 loff_t len = thp_size(page);
685 loff_t wlen;
686 struct ceph_writeback_ctl ceph_wbc;
687 struct ceph_osd_client *osdc = &fsc->client->osdc;
688 struct ceph_osd_request *req;
689 bool caching = ceph_is_cache_enabled(inode);
690 struct page *bounce_page = NULL;
691
692 doutc(cl, "%llx.%llx page %p idx %lu\n", ceph_vinop(inode), page,
693 page->index);
694
695 if (ceph_inode_is_shutdown(inode))
696 return -EIO;
697
698 /* verify this is a writeable snap context */
699 snapc = page_snap_context(page);
700 if (!snapc) {
701 doutc(cl, "%llx.%llx page %p not dirty?\n", ceph_vinop(inode),
702 page);
703 return 0;
704 }
705 oldest = get_oldest_context(inode, &ceph_wbc, snapc);
706 if (snapc->seq > oldest->seq) {
707 doutc(cl, "%llx.%llx page %p snapc %p not writeable - noop\n",
708 ceph_vinop(inode), page, snapc);
709 /* we should only noop if called by kswapd */
710 WARN_ON(!(current->flags & PF_MEMALLOC));
711 ceph_put_snap_context(oldest);
712 redirty_page_for_writepage(wbc, page);
713 return 0;
714 }
715 ceph_put_snap_context(oldest);
716
717 /* is this a partial page at end of file? */
718 if (page_off >= ceph_wbc.i_size) {
719 doutc(cl, "%llx.%llx folio at %lu beyond eof %llu\n",
720 ceph_vinop(inode), folio->index, ceph_wbc.i_size);
721 folio_invalidate(folio, 0, folio_size(folio));
722 return 0;
723 }
724
725 if (ceph_wbc.i_size < page_off + len)
726 len = ceph_wbc.i_size - page_off;
727
728 wlen = IS_ENCRYPTED(inode) ? round_up(len, CEPH_FSCRYPT_BLOCK_SIZE) : len;
729 doutc(cl, "%llx.%llx page %p index %lu on %llu~%llu snapc %p seq %lld\n",
730 ceph_vinop(inode), page, page->index, page_off, wlen, snapc,
731 snapc->seq);
732
733 if (atomic_long_inc_return(&fsc->writeback_count) >
734 CONGESTION_ON_THRESH(fsc->mount_options->congestion_kb))
735 fsc->write_congested = true;
736
737 req = ceph_osdc_new_request(osdc, &ci->i_layout, ceph_vino(inode),
738 page_off, &wlen, 0, 1, CEPH_OSD_OP_WRITE,
739 CEPH_OSD_FLAG_WRITE, snapc,
740 ceph_wbc.truncate_seq,
741 ceph_wbc.truncate_size, true);
742 if (IS_ERR(req)) {
743 redirty_page_for_writepage(wbc, page);
744 return PTR_ERR(req);
745 }
746
747 if (wlen < len)
748 len = wlen;
749
750 set_page_writeback(page);
751 if (caching)
752 ceph_set_page_fscache(page);
753 ceph_fscache_write_to_cache(inode, page_off, len, caching);
754
755 if (IS_ENCRYPTED(inode)) {
756 bounce_page = fscrypt_encrypt_pagecache_blocks(page,
757 CEPH_FSCRYPT_BLOCK_SIZE, 0,
758 GFP_NOFS);
759 if (IS_ERR(bounce_page)) {
760 redirty_page_for_writepage(wbc, page);
761 end_page_writeback(page);
762 ceph_osdc_put_request(req);
763 return PTR_ERR(bounce_page);
764 }
765 }
766
767 /* it may be a short write due to an object boundary */
768 WARN_ON_ONCE(len > thp_size(page));
769 osd_req_op_extent_osd_data_pages(req, 0,
770 bounce_page ? &bounce_page : &page, wlen, 0,
771 false, false);
772 doutc(cl, "%llx.%llx %llu~%llu (%llu bytes, %sencrypted)\n",
773 ceph_vinop(inode), page_off, len, wlen,
774 IS_ENCRYPTED(inode) ? "" : "not ");
775
776 req->r_mtime = inode_get_mtime(inode);
777 ceph_osdc_start_request(osdc, req);
778 err = ceph_osdc_wait_request(osdc, req);
779
780 ceph_update_write_metrics(&fsc->mdsc->metric, req->r_start_latency,
781 req->r_end_latency, len, err);
782 fscrypt_free_bounce_page(bounce_page);
783 ceph_osdc_put_request(req);
784 if (err == 0)
785 err = len;
786
787 if (err < 0) {
788 struct writeback_control tmp_wbc;
789 if (!wbc)
790 wbc = &tmp_wbc;
791 if (err == -ERESTARTSYS) {
792 /* killed by SIGKILL */
793 doutc(cl, "%llx.%llx interrupted page %p\n",
794 ceph_vinop(inode), page);
795 redirty_page_for_writepage(wbc, page);
796 end_page_writeback(page);
797 return err;
798 }
799 if (err == -EBLOCKLISTED)
800 fsc->blocklisted = true;
801 doutc(cl, "%llx.%llx setting page/mapping error %d %p\n",
802 ceph_vinop(inode), err, page);
803 mapping_set_error(&inode->i_data, err);
804 wbc->pages_skipped++;
805 } else {
806 doutc(cl, "%llx.%llx cleaned page %p\n",
807 ceph_vinop(inode), page);
808 err = 0; /* vfs expects us to return 0 */
809 }
810 oldest = detach_page_private(page);
811 WARN_ON_ONCE(oldest != snapc);
812 end_page_writeback(page);
813 ceph_put_wrbuffer_cap_refs(ci, 1, snapc);
814 ceph_put_snap_context(snapc); /* page's reference */
815
816 if (atomic_long_dec_return(&fsc->writeback_count) <
817 CONGESTION_OFF_THRESH(fsc->mount_options->congestion_kb))
818 fsc->write_congested = false;
819
820 return err;
821 }
822
ceph_writepage(struct page * page,struct writeback_control * wbc)823 static int ceph_writepage(struct page *page, struct writeback_control *wbc)
824 {
825 int err;
826 struct inode *inode = page->mapping->host;
827 BUG_ON(!inode);
828 ihold(inode);
829
830 if (wbc->sync_mode == WB_SYNC_NONE &&
831 ceph_inode_to_fs_client(inode)->write_congested) {
832 redirty_page_for_writepage(wbc, page);
833 return AOP_WRITEPAGE_ACTIVATE;
834 }
835
836 folio_wait_private_2(page_folio(page)); /* [DEPRECATED] */
837
838 err = writepage_nounlock(page, wbc);
839 if (err == -ERESTARTSYS) {
840 /* direct memory reclaimer was killed by SIGKILL. return 0
841 * to prevent caller from setting mapping/page error */
842 err = 0;
843 }
844 unlock_page(page);
845 iput(inode);
846 return err;
847 }
848
849 /*
850 * async writeback completion handler.
851 *
852 * If we get an error, set the mapping error bit, but not the individual
853 * page error bits.
854 */
writepages_finish(struct ceph_osd_request * req)855 static void writepages_finish(struct ceph_osd_request *req)
856 {
857 struct inode *inode = req->r_inode;
858 struct ceph_inode_info *ci = ceph_inode(inode);
859 struct ceph_client *cl = ceph_inode_to_client(inode);
860 struct ceph_osd_data *osd_data;
861 struct page *page;
862 int num_pages, total_pages = 0;
863 int i, j;
864 int rc = req->r_result;
865 struct ceph_snap_context *snapc = req->r_snapc;
866 struct address_space *mapping = inode->i_mapping;
867 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
868 unsigned int len = 0;
869 bool remove_page;
870
871 doutc(cl, "%llx.%llx rc %d\n", ceph_vinop(inode), rc);
872 if (rc < 0) {
873 mapping_set_error(mapping, rc);
874 ceph_set_error_write(ci);
875 if (rc == -EBLOCKLISTED)
876 fsc->blocklisted = true;
877 } else {
878 ceph_clear_error_write(ci);
879 }
880
881 /*
882 * We lost the cache cap, need to truncate the page before
883 * it is unlocked, otherwise we'd truncate it later in the
884 * page truncation thread, possibly losing some data that
885 * raced its way in
886 */
887 remove_page = !(ceph_caps_issued(ci) &
888 (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO));
889
890 /* clean all pages */
891 for (i = 0; i < req->r_num_ops; i++) {
892 if (req->r_ops[i].op != CEPH_OSD_OP_WRITE) {
893 pr_warn_client(cl,
894 "%llx.%llx incorrect op %d req %p index %d tid %llu\n",
895 ceph_vinop(inode), req->r_ops[i].op, req, i,
896 req->r_tid);
897 break;
898 }
899
900 osd_data = osd_req_op_extent_osd_data(req, i);
901 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES);
902 len += osd_data->length;
903 num_pages = calc_pages_for((u64)osd_data->alignment,
904 (u64)osd_data->length);
905 total_pages += num_pages;
906 for (j = 0; j < num_pages; j++) {
907 page = osd_data->pages[j];
908 if (fscrypt_is_bounce_page(page)) {
909 page = fscrypt_pagecache_page(page);
910 fscrypt_free_bounce_page(osd_data->pages[j]);
911 osd_data->pages[j] = page;
912 }
913 BUG_ON(!page);
914 WARN_ON(!PageUptodate(page));
915
916 if (atomic_long_dec_return(&fsc->writeback_count) <
917 CONGESTION_OFF_THRESH(
918 fsc->mount_options->congestion_kb))
919 fsc->write_congested = false;
920
921 ceph_put_snap_context(detach_page_private(page));
922 end_page_writeback(page);
923 doutc(cl, "unlocking %p\n", page);
924
925 if (remove_page)
926 generic_error_remove_folio(inode->i_mapping,
927 page_folio(page));
928
929 unlock_page(page);
930 }
931 doutc(cl, "%llx.%llx wrote %llu bytes cleaned %d pages\n",
932 ceph_vinop(inode), osd_data->length,
933 rc >= 0 ? num_pages : 0);
934
935 release_pages(osd_data->pages, num_pages);
936 }
937
938 ceph_update_write_metrics(&fsc->mdsc->metric, req->r_start_latency,
939 req->r_end_latency, len, rc);
940
941 ceph_put_wrbuffer_cap_refs(ci, total_pages, snapc);
942
943 osd_data = osd_req_op_extent_osd_data(req, 0);
944 if (osd_data->pages_from_pool)
945 mempool_free(osd_data->pages, ceph_wb_pagevec_pool);
946 else
947 kfree(osd_data->pages);
948 ceph_osdc_put_request(req);
949 ceph_dec_osd_stopping_blocker(fsc->mdsc);
950 }
951
952 /*
953 * initiate async writeback
954 */
ceph_writepages_start(struct address_space * mapping,struct writeback_control * wbc)955 static int ceph_writepages_start(struct address_space *mapping,
956 struct writeback_control *wbc)
957 {
958 struct inode *inode = mapping->host;
959 struct ceph_inode_info *ci = ceph_inode(inode);
960 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
961 struct ceph_client *cl = fsc->client;
962 struct ceph_vino vino = ceph_vino(inode);
963 pgoff_t index, start_index, end = -1;
964 struct ceph_snap_context *snapc = NULL, *last_snapc = NULL, *pgsnapc;
965 struct folio_batch fbatch;
966 int rc = 0;
967 unsigned int wsize = i_blocksize(inode);
968 struct ceph_osd_request *req = NULL;
969 struct ceph_writeback_ctl ceph_wbc;
970 bool should_loop, range_whole = false;
971 bool done = false;
972 bool caching = ceph_is_cache_enabled(inode);
973 xa_mark_t tag;
974
975 if (wbc->sync_mode == WB_SYNC_NONE &&
976 fsc->write_congested)
977 return 0;
978
979 doutc(cl, "%llx.%llx (mode=%s)\n", ceph_vinop(inode),
980 wbc->sync_mode == WB_SYNC_NONE ? "NONE" :
981 (wbc->sync_mode == WB_SYNC_ALL ? "ALL" : "HOLD"));
982
983 if (ceph_inode_is_shutdown(inode)) {
984 if (ci->i_wrbuffer_ref > 0) {
985 pr_warn_ratelimited_client(cl,
986 "%llx.%llx %lld forced umount\n",
987 ceph_vinop(inode), ceph_ino(inode));
988 }
989 mapping_set_error(mapping, -EIO);
990 return -EIO; /* we're in a forced umount, don't write! */
991 }
992 if (fsc->mount_options->wsize < wsize)
993 wsize = fsc->mount_options->wsize;
994
995 folio_batch_init(&fbatch);
996
997 start_index = wbc->range_cyclic ? mapping->writeback_index : 0;
998 index = start_index;
999
1000 if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages) {
1001 tag = PAGECACHE_TAG_TOWRITE;
1002 } else {
1003 tag = PAGECACHE_TAG_DIRTY;
1004 }
1005 retry:
1006 /* find oldest snap context with dirty data */
1007 snapc = get_oldest_context(inode, &ceph_wbc, NULL);
1008 if (!snapc) {
1009 /* hmm, why does writepages get called when there
1010 is no dirty data? */
1011 doutc(cl, " no snap context with dirty data?\n");
1012 goto out;
1013 }
1014 doutc(cl, " oldest snapc is %p seq %lld (%d snaps)\n", snapc,
1015 snapc->seq, snapc->num_snaps);
1016
1017 should_loop = false;
1018 if (ceph_wbc.head_snapc && snapc != last_snapc) {
1019 /* where to start/end? */
1020 if (wbc->range_cyclic) {
1021 index = start_index;
1022 end = -1;
1023 if (index > 0)
1024 should_loop = true;
1025 doutc(cl, " cyclic, start at %lu\n", index);
1026 } else {
1027 index = wbc->range_start >> PAGE_SHIFT;
1028 end = wbc->range_end >> PAGE_SHIFT;
1029 if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
1030 range_whole = true;
1031 doutc(cl, " not cyclic, %lu to %lu\n", index, end);
1032 }
1033 } else if (!ceph_wbc.head_snapc) {
1034 /* Do not respect wbc->range_{start,end}. Dirty pages
1035 * in that range can be associated with newer snapc.
1036 * They are not writeable until we write all dirty pages
1037 * associated with 'snapc' get written */
1038 if (index > 0)
1039 should_loop = true;
1040 doutc(cl, " non-head snapc, range whole\n");
1041 }
1042
1043 if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages)
1044 tag_pages_for_writeback(mapping, index, end);
1045
1046 ceph_put_snap_context(last_snapc);
1047 last_snapc = snapc;
1048
1049 while (!done && index <= end) {
1050 int num_ops = 0, op_idx;
1051 unsigned i, nr_folios, max_pages, locked_pages = 0;
1052 struct page **pages = NULL, **data_pages;
1053 struct page *page;
1054 pgoff_t strip_unit_end = 0;
1055 u64 offset = 0, len = 0;
1056 bool from_pool = false;
1057
1058 max_pages = wsize >> PAGE_SHIFT;
1059
1060 get_more_pages:
1061 nr_folios = filemap_get_folios_tag(mapping, &index,
1062 end, tag, &fbatch);
1063 doutc(cl, "pagevec_lookup_range_tag got %d\n", nr_folios);
1064 if (!nr_folios && !locked_pages)
1065 break;
1066 for (i = 0; i < nr_folios && locked_pages < max_pages; i++) {
1067 struct folio *folio = fbatch.folios[i];
1068
1069 page = &folio->page;
1070 doutc(cl, "? %p idx %lu\n", page, page->index);
1071 if (locked_pages == 0)
1072 lock_page(page); /* first page */
1073 else if (!trylock_page(page))
1074 break;
1075
1076 /* only dirty pages, or our accounting breaks */
1077 if (unlikely(!PageDirty(page)) ||
1078 unlikely(page->mapping != mapping)) {
1079 doutc(cl, "!dirty or !mapping %p\n", page);
1080 unlock_page(page);
1081 continue;
1082 }
1083 /* only if matching snap context */
1084 pgsnapc = page_snap_context(page);
1085 if (pgsnapc != snapc) {
1086 doutc(cl, "page snapc %p %lld != oldest %p %lld\n",
1087 pgsnapc, pgsnapc->seq, snapc, snapc->seq);
1088 if (!should_loop &&
1089 !ceph_wbc.head_snapc &&
1090 wbc->sync_mode != WB_SYNC_NONE)
1091 should_loop = true;
1092 unlock_page(page);
1093 continue;
1094 }
1095 if (page_offset(page) >= ceph_wbc.i_size) {
1096 doutc(cl, "folio at %lu beyond eof %llu\n",
1097 folio->index, ceph_wbc.i_size);
1098 if ((ceph_wbc.size_stable ||
1099 folio_pos(folio) >= i_size_read(inode)) &&
1100 folio_clear_dirty_for_io(folio))
1101 folio_invalidate(folio, 0,
1102 folio_size(folio));
1103 folio_unlock(folio);
1104 continue;
1105 }
1106 if (strip_unit_end && (page->index > strip_unit_end)) {
1107 doutc(cl, "end of strip unit %p\n", page);
1108 unlock_page(page);
1109 break;
1110 }
1111 if (folio_test_writeback(folio) ||
1112 folio_test_private_2(folio) /* [DEPRECATED] */) {
1113 if (wbc->sync_mode == WB_SYNC_NONE) {
1114 doutc(cl, "%p under writeback\n", folio);
1115 folio_unlock(folio);
1116 continue;
1117 }
1118 doutc(cl, "waiting on writeback %p\n", folio);
1119 folio_wait_writeback(folio);
1120 folio_wait_private_2(folio); /* [DEPRECATED] */
1121 }
1122
1123 if (!clear_page_dirty_for_io(page)) {
1124 doutc(cl, "%p !clear_page_dirty_for_io\n", page);
1125 unlock_page(page);
1126 continue;
1127 }
1128
1129 /*
1130 * We have something to write. If this is
1131 * the first locked page this time through,
1132 * calculate max possinle write size and
1133 * allocate a page array
1134 */
1135 if (locked_pages == 0) {
1136 u64 objnum;
1137 u64 objoff;
1138 u32 xlen;
1139
1140 /* prepare async write request */
1141 offset = (u64)page_offset(page);
1142 ceph_calc_file_object_mapping(&ci->i_layout,
1143 offset, wsize,
1144 &objnum, &objoff,
1145 &xlen);
1146 len = xlen;
1147
1148 num_ops = 1;
1149 strip_unit_end = page->index +
1150 ((len - 1) >> PAGE_SHIFT);
1151
1152 BUG_ON(pages);
1153 max_pages = calc_pages_for(0, (u64)len);
1154 pages = kmalloc_array(max_pages,
1155 sizeof(*pages),
1156 GFP_NOFS);
1157 if (!pages) {
1158 from_pool = true;
1159 pages = mempool_alloc(ceph_wb_pagevec_pool, GFP_NOFS);
1160 BUG_ON(!pages);
1161 }
1162
1163 len = 0;
1164 } else if (page->index !=
1165 (offset + len) >> PAGE_SHIFT) {
1166 if (num_ops >= (from_pool ? CEPH_OSD_SLAB_OPS :
1167 CEPH_OSD_MAX_OPS)) {
1168 redirty_page_for_writepage(wbc, page);
1169 unlock_page(page);
1170 break;
1171 }
1172
1173 num_ops++;
1174 offset = (u64)page_offset(page);
1175 len = 0;
1176 }
1177
1178 /* note position of first page in fbatch */
1179 doutc(cl, "%llx.%llx will write page %p idx %lu\n",
1180 ceph_vinop(inode), page, page->index);
1181
1182 if (atomic_long_inc_return(&fsc->writeback_count) >
1183 CONGESTION_ON_THRESH(
1184 fsc->mount_options->congestion_kb))
1185 fsc->write_congested = true;
1186
1187 if (IS_ENCRYPTED(inode)) {
1188 pages[locked_pages] =
1189 fscrypt_encrypt_pagecache_blocks(page,
1190 PAGE_SIZE, 0,
1191 locked_pages ? GFP_NOWAIT : GFP_NOFS);
1192 if (IS_ERR(pages[locked_pages])) {
1193 if (PTR_ERR(pages[locked_pages]) == -EINVAL)
1194 pr_err_client(cl,
1195 "inode->i_blkbits=%hhu\n",
1196 inode->i_blkbits);
1197 /* better not fail on first page! */
1198 BUG_ON(locked_pages == 0);
1199 pages[locked_pages] = NULL;
1200 redirty_page_for_writepage(wbc, page);
1201 unlock_page(page);
1202 break;
1203 }
1204 ++locked_pages;
1205 } else {
1206 pages[locked_pages++] = page;
1207 }
1208
1209 fbatch.folios[i] = NULL;
1210 len += thp_size(page);
1211 }
1212
1213 /* did we get anything? */
1214 if (!locked_pages)
1215 goto release_folios;
1216 if (i) {
1217 unsigned j, n = 0;
1218 /* shift unused page to beginning of fbatch */
1219 for (j = 0; j < nr_folios; j++) {
1220 if (!fbatch.folios[j])
1221 continue;
1222 if (n < j)
1223 fbatch.folios[n] = fbatch.folios[j];
1224 n++;
1225 }
1226 fbatch.nr = n;
1227
1228 if (nr_folios && i == nr_folios &&
1229 locked_pages < max_pages) {
1230 doutc(cl, "reached end fbatch, trying for more\n");
1231 folio_batch_release(&fbatch);
1232 goto get_more_pages;
1233 }
1234 }
1235
1236 new_request:
1237 offset = ceph_fscrypt_page_offset(pages[0]);
1238 len = wsize;
1239
1240 req = ceph_osdc_new_request(&fsc->client->osdc,
1241 &ci->i_layout, vino,
1242 offset, &len, 0, num_ops,
1243 CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE,
1244 snapc, ceph_wbc.truncate_seq,
1245 ceph_wbc.truncate_size, false);
1246 if (IS_ERR(req)) {
1247 req = ceph_osdc_new_request(&fsc->client->osdc,
1248 &ci->i_layout, vino,
1249 offset, &len, 0,
1250 min(num_ops,
1251 CEPH_OSD_SLAB_OPS),
1252 CEPH_OSD_OP_WRITE,
1253 CEPH_OSD_FLAG_WRITE,
1254 snapc, ceph_wbc.truncate_seq,
1255 ceph_wbc.truncate_size, true);
1256 BUG_ON(IS_ERR(req));
1257 }
1258 BUG_ON(len < ceph_fscrypt_page_offset(pages[locked_pages - 1]) +
1259 thp_size(pages[locked_pages - 1]) - offset);
1260
1261 if (!ceph_inc_osd_stopping_blocker(fsc->mdsc)) {
1262 rc = -EIO;
1263 goto release_folios;
1264 }
1265 req->r_callback = writepages_finish;
1266 req->r_inode = inode;
1267
1268 /* Format the osd request message and submit the write */
1269 len = 0;
1270 data_pages = pages;
1271 op_idx = 0;
1272 for (i = 0; i < locked_pages; i++) {
1273 struct page *page = ceph_fscrypt_pagecache_page(pages[i]);
1274
1275 u64 cur_offset = page_offset(page);
1276 /*
1277 * Discontinuity in page range? Ceph can handle that by just passing
1278 * multiple extents in the write op.
1279 */
1280 if (offset + len != cur_offset) {
1281 /* If it's full, stop here */
1282 if (op_idx + 1 == req->r_num_ops)
1283 break;
1284
1285 /* Kick off an fscache write with what we have so far. */
1286 ceph_fscache_write_to_cache(inode, offset, len, caching);
1287
1288 /* Start a new extent */
1289 osd_req_op_extent_dup_last(req, op_idx,
1290 cur_offset - offset);
1291 doutc(cl, "got pages at %llu~%llu\n", offset,
1292 len);
1293 osd_req_op_extent_osd_data_pages(req, op_idx,
1294 data_pages, len, 0,
1295 from_pool, false);
1296 osd_req_op_extent_update(req, op_idx, len);
1297
1298 len = 0;
1299 offset = cur_offset;
1300 data_pages = pages + i;
1301 op_idx++;
1302 }
1303
1304 set_page_writeback(page);
1305 if (caching)
1306 ceph_set_page_fscache(page);
1307 len += thp_size(page);
1308 }
1309 ceph_fscache_write_to_cache(inode, offset, len, caching);
1310
1311 if (ceph_wbc.size_stable) {
1312 len = min(len, ceph_wbc.i_size - offset);
1313 } else if (i == locked_pages) {
1314 /* writepages_finish() clears writeback pages
1315 * according to the data length, so make sure
1316 * data length covers all locked pages */
1317 u64 min_len = len + 1 - thp_size(page);
1318 len = get_writepages_data_length(inode, pages[i - 1],
1319 offset);
1320 len = max(len, min_len);
1321 }
1322 if (IS_ENCRYPTED(inode))
1323 len = round_up(len, CEPH_FSCRYPT_BLOCK_SIZE);
1324
1325 doutc(cl, "got pages at %llu~%llu\n", offset, len);
1326
1327 if (IS_ENCRYPTED(inode) &&
1328 ((offset | len) & ~CEPH_FSCRYPT_BLOCK_MASK))
1329 pr_warn_client(cl,
1330 "bad encrypted write offset=%lld len=%llu\n",
1331 offset, len);
1332
1333 osd_req_op_extent_osd_data_pages(req, op_idx, data_pages, len,
1334 0, from_pool, false);
1335 osd_req_op_extent_update(req, op_idx, len);
1336
1337 BUG_ON(op_idx + 1 != req->r_num_ops);
1338
1339 from_pool = false;
1340 if (i < locked_pages) {
1341 BUG_ON(num_ops <= req->r_num_ops);
1342 num_ops -= req->r_num_ops;
1343 locked_pages -= i;
1344
1345 /* allocate new pages array for next request */
1346 data_pages = pages;
1347 pages = kmalloc_array(locked_pages, sizeof(*pages),
1348 GFP_NOFS);
1349 if (!pages) {
1350 from_pool = true;
1351 pages = mempool_alloc(ceph_wb_pagevec_pool, GFP_NOFS);
1352 BUG_ON(!pages);
1353 }
1354 memcpy(pages, data_pages + i,
1355 locked_pages * sizeof(*pages));
1356 memset(data_pages + i, 0,
1357 locked_pages * sizeof(*pages));
1358 } else {
1359 BUG_ON(num_ops != req->r_num_ops);
1360 index = pages[i - 1]->index + 1;
1361 /* request message now owns the pages array */
1362 pages = NULL;
1363 }
1364
1365 req->r_mtime = inode_get_mtime(inode);
1366 ceph_osdc_start_request(&fsc->client->osdc, req);
1367 req = NULL;
1368
1369 wbc->nr_to_write -= i;
1370 if (pages)
1371 goto new_request;
1372
1373 /*
1374 * We stop writing back only if we are not doing
1375 * integrity sync. In case of integrity sync we have to
1376 * keep going until we have written all the pages
1377 * we tagged for writeback prior to entering this loop.
1378 */
1379 if (wbc->nr_to_write <= 0 && wbc->sync_mode == WB_SYNC_NONE)
1380 done = true;
1381
1382 release_folios:
1383 doutc(cl, "folio_batch release on %d folios (%p)\n",
1384 (int)fbatch.nr, fbatch.nr ? fbatch.folios[0] : NULL);
1385 folio_batch_release(&fbatch);
1386 }
1387
1388 if (should_loop && !done) {
1389 /* more to do; loop back to beginning of file */
1390 doutc(cl, "looping back to beginning of file\n");
1391 end = start_index - 1; /* OK even when start_index == 0 */
1392
1393 /* to write dirty pages associated with next snapc,
1394 * we need to wait until current writes complete */
1395 if (wbc->sync_mode != WB_SYNC_NONE &&
1396 start_index == 0 && /* all dirty pages were checked */
1397 !ceph_wbc.head_snapc) {
1398 struct page *page;
1399 unsigned i, nr;
1400 index = 0;
1401 while ((index <= end) &&
1402 (nr = filemap_get_folios_tag(mapping, &index,
1403 (pgoff_t)-1,
1404 PAGECACHE_TAG_WRITEBACK,
1405 &fbatch))) {
1406 for (i = 0; i < nr; i++) {
1407 page = &fbatch.folios[i]->page;
1408 if (page_snap_context(page) != snapc)
1409 continue;
1410 wait_on_page_writeback(page);
1411 }
1412 folio_batch_release(&fbatch);
1413 cond_resched();
1414 }
1415 }
1416
1417 start_index = 0;
1418 index = 0;
1419 goto retry;
1420 }
1421
1422 if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
1423 mapping->writeback_index = index;
1424
1425 out:
1426 ceph_osdc_put_request(req);
1427 ceph_put_snap_context(last_snapc);
1428 doutc(cl, "%llx.%llx dend - startone, rc = %d\n", ceph_vinop(inode),
1429 rc);
1430 return rc;
1431 }
1432
1433
1434
1435 /*
1436 * See if a given @snapc is either writeable, or already written.
1437 */
context_is_writeable_or_written(struct inode * inode,struct ceph_snap_context * snapc)1438 static int context_is_writeable_or_written(struct inode *inode,
1439 struct ceph_snap_context *snapc)
1440 {
1441 struct ceph_snap_context *oldest = get_oldest_context(inode, NULL, NULL);
1442 int ret = !oldest || snapc->seq <= oldest->seq;
1443
1444 ceph_put_snap_context(oldest);
1445 return ret;
1446 }
1447
1448 /**
1449 * ceph_find_incompatible - find an incompatible context and return it
1450 * @page: page being dirtied
1451 *
1452 * We are only allowed to write into/dirty a page if the page is
1453 * clean, or already dirty within the same snap context. Returns a
1454 * conflicting context if there is one, NULL if there isn't, or a
1455 * negative error code on other errors.
1456 *
1457 * Must be called with page lock held.
1458 */
1459 static struct ceph_snap_context *
ceph_find_incompatible(struct page * page)1460 ceph_find_incompatible(struct page *page)
1461 {
1462 struct inode *inode = page->mapping->host;
1463 struct ceph_client *cl = ceph_inode_to_client(inode);
1464 struct ceph_inode_info *ci = ceph_inode(inode);
1465
1466 if (ceph_inode_is_shutdown(inode)) {
1467 doutc(cl, " %llx.%llx page %p is shutdown\n",
1468 ceph_vinop(inode), page);
1469 return ERR_PTR(-ESTALE);
1470 }
1471
1472 for (;;) {
1473 struct ceph_snap_context *snapc, *oldest;
1474
1475 wait_on_page_writeback(page);
1476
1477 snapc = page_snap_context(page);
1478 if (!snapc || snapc == ci->i_head_snapc)
1479 break;
1480
1481 /*
1482 * this page is already dirty in another (older) snap
1483 * context! is it writeable now?
1484 */
1485 oldest = get_oldest_context(inode, NULL, NULL);
1486 if (snapc->seq > oldest->seq) {
1487 /* not writeable -- return it for the caller to deal with */
1488 ceph_put_snap_context(oldest);
1489 doutc(cl, " %llx.%llx page %p snapc %p not current or oldest\n",
1490 ceph_vinop(inode), page, snapc);
1491 return ceph_get_snap_context(snapc);
1492 }
1493 ceph_put_snap_context(oldest);
1494
1495 /* yay, writeable, do it now (without dropping page lock) */
1496 doutc(cl, " %llx.%llx page %p snapc %p not current, but oldest\n",
1497 ceph_vinop(inode), page, snapc);
1498 if (clear_page_dirty_for_io(page)) {
1499 int r = writepage_nounlock(page, NULL);
1500 if (r < 0)
1501 return ERR_PTR(r);
1502 }
1503 }
1504 return NULL;
1505 }
1506
ceph_netfs_check_write_begin(struct file * file,loff_t pos,unsigned int len,struct folio ** foliop,void ** _fsdata)1507 static int ceph_netfs_check_write_begin(struct file *file, loff_t pos, unsigned int len,
1508 struct folio **foliop, void **_fsdata)
1509 {
1510 struct inode *inode = file_inode(file);
1511 struct ceph_inode_info *ci = ceph_inode(inode);
1512 struct ceph_snap_context *snapc;
1513
1514 snapc = ceph_find_incompatible(folio_page(*foliop, 0));
1515 if (snapc) {
1516 int r;
1517
1518 folio_unlock(*foliop);
1519 folio_put(*foliop);
1520 *foliop = NULL;
1521 if (IS_ERR(snapc))
1522 return PTR_ERR(snapc);
1523
1524 ceph_queue_writeback(inode);
1525 r = wait_event_killable(ci->i_cap_wq,
1526 context_is_writeable_or_written(inode, snapc));
1527 ceph_put_snap_context(snapc);
1528 return r == 0 ? -EAGAIN : r;
1529 }
1530 return 0;
1531 }
1532
1533 /*
1534 * We are only allowed to write into/dirty the page if the page is
1535 * clean, or already dirty within the same snap context.
1536 */
ceph_write_begin(struct file * file,struct address_space * mapping,loff_t pos,unsigned len,struct folio ** foliop,void ** fsdata)1537 static int ceph_write_begin(struct file *file, struct address_space *mapping,
1538 loff_t pos, unsigned len,
1539 struct folio **foliop, void **fsdata)
1540 {
1541 struct inode *inode = file_inode(file);
1542 struct ceph_inode_info *ci = ceph_inode(inode);
1543 int r;
1544
1545 r = netfs_write_begin(&ci->netfs, file, inode->i_mapping, pos, len, foliop, NULL);
1546 if (r < 0)
1547 return r;
1548
1549 folio_wait_private_2(*foliop); /* [DEPRECATED] */
1550 WARN_ON_ONCE(!folio_test_locked(*foliop));
1551 return 0;
1552 }
1553
1554 /*
1555 * we don't do anything in here that simple_write_end doesn't do
1556 * except adjust dirty page accounting
1557 */
ceph_write_end(struct file * file,struct address_space * mapping,loff_t pos,unsigned len,unsigned copied,struct folio * folio,void * fsdata)1558 static int ceph_write_end(struct file *file, struct address_space *mapping,
1559 loff_t pos, unsigned len, unsigned copied,
1560 struct folio *folio, void *fsdata)
1561 {
1562 struct inode *inode = file_inode(file);
1563 struct ceph_client *cl = ceph_inode_to_client(inode);
1564 bool check_cap = false;
1565
1566 doutc(cl, "%llx.%llx file %p folio %p %d~%d (%d)\n", ceph_vinop(inode),
1567 file, folio, (int)pos, (int)copied, (int)len);
1568
1569 if (!folio_test_uptodate(folio)) {
1570 /* just return that nothing was copied on a short copy */
1571 if (copied < len) {
1572 copied = 0;
1573 goto out;
1574 }
1575 folio_mark_uptodate(folio);
1576 }
1577
1578 /* did file size increase? */
1579 if (pos+copied > i_size_read(inode))
1580 check_cap = ceph_inode_set_size(inode, pos+copied);
1581
1582 folio_mark_dirty(folio);
1583
1584 out:
1585 folio_unlock(folio);
1586 folio_put(folio);
1587
1588 if (check_cap)
1589 ceph_check_caps(ceph_inode(inode), CHECK_CAPS_AUTHONLY);
1590
1591 return copied;
1592 }
1593
1594 const struct address_space_operations ceph_aops = {
1595 .read_folio = netfs_read_folio,
1596 .readahead = netfs_readahead,
1597 .writepage = ceph_writepage,
1598 .writepages = ceph_writepages_start,
1599 .write_begin = ceph_write_begin,
1600 .write_end = ceph_write_end,
1601 .dirty_folio = ceph_dirty_folio,
1602 .invalidate_folio = ceph_invalidate_folio,
1603 .release_folio = netfs_release_folio,
1604 .direct_IO = noop_direct_IO,
1605 };
1606
ceph_block_sigs(sigset_t * oldset)1607 static void ceph_block_sigs(sigset_t *oldset)
1608 {
1609 sigset_t mask;
1610 siginitsetinv(&mask, sigmask(SIGKILL));
1611 sigprocmask(SIG_BLOCK, &mask, oldset);
1612 }
1613
ceph_restore_sigs(sigset_t * oldset)1614 static void ceph_restore_sigs(sigset_t *oldset)
1615 {
1616 sigprocmask(SIG_SETMASK, oldset, NULL);
1617 }
1618
1619 /*
1620 * vm ops
1621 */
ceph_filemap_fault(struct vm_fault * vmf)1622 static vm_fault_t ceph_filemap_fault(struct vm_fault *vmf)
1623 {
1624 struct vm_area_struct *vma = vmf->vma;
1625 struct inode *inode = file_inode(vma->vm_file);
1626 struct ceph_inode_info *ci = ceph_inode(inode);
1627 struct ceph_client *cl = ceph_inode_to_client(inode);
1628 struct ceph_file_info *fi = vma->vm_file->private_data;
1629 loff_t off = (loff_t)vmf->pgoff << PAGE_SHIFT;
1630 int want, got, err;
1631 sigset_t oldset;
1632 vm_fault_t ret = VM_FAULT_SIGBUS;
1633
1634 if (ceph_inode_is_shutdown(inode))
1635 return ret;
1636
1637 ceph_block_sigs(&oldset);
1638
1639 doutc(cl, "%llx.%llx %llu trying to get caps\n",
1640 ceph_vinop(inode), off);
1641 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1642 want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
1643 else
1644 want = CEPH_CAP_FILE_CACHE;
1645
1646 got = 0;
1647 err = ceph_get_caps(vma->vm_file, CEPH_CAP_FILE_RD, want, -1, &got);
1648 if (err < 0)
1649 goto out_restore;
1650
1651 doutc(cl, "%llx.%llx %llu got cap refs on %s\n", ceph_vinop(inode),
1652 off, ceph_cap_string(got));
1653
1654 if ((got & (CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO)) ||
1655 !ceph_has_inline_data(ci)) {
1656 CEPH_DEFINE_RW_CONTEXT(rw_ctx, got);
1657 ceph_add_rw_context(fi, &rw_ctx);
1658 ret = filemap_fault(vmf);
1659 ceph_del_rw_context(fi, &rw_ctx);
1660 doutc(cl, "%llx.%llx %llu drop cap refs %s ret %x\n",
1661 ceph_vinop(inode), off, ceph_cap_string(got), ret);
1662 } else
1663 err = -EAGAIN;
1664
1665 ceph_put_cap_refs(ci, got);
1666
1667 if (err != -EAGAIN)
1668 goto out_restore;
1669
1670 /* read inline data */
1671 if (off >= PAGE_SIZE) {
1672 /* does not support inline data > PAGE_SIZE */
1673 ret = VM_FAULT_SIGBUS;
1674 } else {
1675 struct address_space *mapping = inode->i_mapping;
1676 struct page *page;
1677
1678 filemap_invalidate_lock_shared(mapping);
1679 page = find_or_create_page(mapping, 0,
1680 mapping_gfp_constraint(mapping, ~__GFP_FS));
1681 if (!page) {
1682 ret = VM_FAULT_OOM;
1683 goto out_inline;
1684 }
1685 err = __ceph_do_getattr(inode, page,
1686 CEPH_STAT_CAP_INLINE_DATA, true);
1687 if (err < 0 || off >= i_size_read(inode)) {
1688 unlock_page(page);
1689 put_page(page);
1690 ret = vmf_error(err);
1691 goto out_inline;
1692 }
1693 if (err < PAGE_SIZE)
1694 zero_user_segment(page, err, PAGE_SIZE);
1695 else
1696 flush_dcache_page(page);
1697 SetPageUptodate(page);
1698 vmf->page = page;
1699 ret = VM_FAULT_MAJOR | VM_FAULT_LOCKED;
1700 out_inline:
1701 filemap_invalidate_unlock_shared(mapping);
1702 doutc(cl, "%llx.%llx %llu read inline data ret %x\n",
1703 ceph_vinop(inode), off, ret);
1704 }
1705 out_restore:
1706 ceph_restore_sigs(&oldset);
1707 if (err < 0)
1708 ret = vmf_error(err);
1709
1710 return ret;
1711 }
1712
ceph_page_mkwrite(struct vm_fault * vmf)1713 static vm_fault_t ceph_page_mkwrite(struct vm_fault *vmf)
1714 {
1715 struct vm_area_struct *vma = vmf->vma;
1716 struct inode *inode = file_inode(vma->vm_file);
1717 struct ceph_client *cl = ceph_inode_to_client(inode);
1718 struct ceph_inode_info *ci = ceph_inode(inode);
1719 struct ceph_file_info *fi = vma->vm_file->private_data;
1720 struct ceph_cap_flush *prealloc_cf;
1721 struct page *page = vmf->page;
1722 loff_t off = page_offset(page);
1723 loff_t size = i_size_read(inode);
1724 size_t len;
1725 int want, got, err;
1726 sigset_t oldset;
1727 vm_fault_t ret = VM_FAULT_SIGBUS;
1728
1729 if (ceph_inode_is_shutdown(inode))
1730 return ret;
1731
1732 prealloc_cf = ceph_alloc_cap_flush();
1733 if (!prealloc_cf)
1734 return VM_FAULT_OOM;
1735
1736 sb_start_pagefault(inode->i_sb);
1737 ceph_block_sigs(&oldset);
1738
1739 if (off + thp_size(page) <= size)
1740 len = thp_size(page);
1741 else
1742 len = offset_in_thp(page, size);
1743
1744 doutc(cl, "%llx.%llx %llu~%zd getting caps i_size %llu\n",
1745 ceph_vinop(inode), off, len, size);
1746 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1747 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
1748 else
1749 want = CEPH_CAP_FILE_BUFFER;
1750
1751 got = 0;
1752 err = ceph_get_caps(vma->vm_file, CEPH_CAP_FILE_WR, want, off + len, &got);
1753 if (err < 0)
1754 goto out_free;
1755
1756 doutc(cl, "%llx.%llx %llu~%zd got cap refs on %s\n", ceph_vinop(inode),
1757 off, len, ceph_cap_string(got));
1758
1759 /* Update time before taking page lock */
1760 file_update_time(vma->vm_file);
1761 inode_inc_iversion_raw(inode);
1762
1763 do {
1764 struct ceph_snap_context *snapc;
1765
1766 lock_page(page);
1767
1768 if (page_mkwrite_check_truncate(page, inode) < 0) {
1769 unlock_page(page);
1770 ret = VM_FAULT_NOPAGE;
1771 break;
1772 }
1773
1774 snapc = ceph_find_incompatible(page);
1775 if (!snapc) {
1776 /* success. we'll keep the page locked. */
1777 set_page_dirty(page);
1778 ret = VM_FAULT_LOCKED;
1779 break;
1780 }
1781
1782 unlock_page(page);
1783
1784 if (IS_ERR(snapc)) {
1785 ret = VM_FAULT_SIGBUS;
1786 break;
1787 }
1788
1789 ceph_queue_writeback(inode);
1790 err = wait_event_killable(ci->i_cap_wq,
1791 context_is_writeable_or_written(inode, snapc));
1792 ceph_put_snap_context(snapc);
1793 } while (err == 0);
1794
1795 if (ret == VM_FAULT_LOCKED) {
1796 int dirty;
1797 spin_lock(&ci->i_ceph_lock);
1798 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
1799 &prealloc_cf);
1800 spin_unlock(&ci->i_ceph_lock);
1801 if (dirty)
1802 __mark_inode_dirty(inode, dirty);
1803 }
1804
1805 doutc(cl, "%llx.%llx %llu~%zd dropping cap refs on %s ret %x\n",
1806 ceph_vinop(inode), off, len, ceph_cap_string(got), ret);
1807 ceph_put_cap_refs_async(ci, got);
1808 out_free:
1809 ceph_restore_sigs(&oldset);
1810 sb_end_pagefault(inode->i_sb);
1811 ceph_free_cap_flush(prealloc_cf);
1812 if (err < 0)
1813 ret = vmf_error(err);
1814 return ret;
1815 }
1816
ceph_fill_inline_data(struct inode * inode,struct page * locked_page,char * data,size_t len)1817 void ceph_fill_inline_data(struct inode *inode, struct page *locked_page,
1818 char *data, size_t len)
1819 {
1820 struct ceph_client *cl = ceph_inode_to_client(inode);
1821 struct address_space *mapping = inode->i_mapping;
1822 struct page *page;
1823
1824 if (locked_page) {
1825 page = locked_page;
1826 } else {
1827 if (i_size_read(inode) == 0)
1828 return;
1829 page = find_or_create_page(mapping, 0,
1830 mapping_gfp_constraint(mapping,
1831 ~__GFP_FS));
1832 if (!page)
1833 return;
1834 if (PageUptodate(page)) {
1835 unlock_page(page);
1836 put_page(page);
1837 return;
1838 }
1839 }
1840
1841 doutc(cl, "%p %llx.%llx len %zu locked_page %p\n", inode,
1842 ceph_vinop(inode), len, locked_page);
1843
1844 if (len > 0) {
1845 void *kaddr = kmap_atomic(page);
1846 memcpy(kaddr, data, len);
1847 kunmap_atomic(kaddr);
1848 }
1849
1850 if (page != locked_page) {
1851 if (len < PAGE_SIZE)
1852 zero_user_segment(page, len, PAGE_SIZE);
1853 else
1854 flush_dcache_page(page);
1855
1856 SetPageUptodate(page);
1857 unlock_page(page);
1858 put_page(page);
1859 }
1860 }
1861
ceph_uninline_data(struct file * file)1862 int ceph_uninline_data(struct file *file)
1863 {
1864 struct inode *inode = file_inode(file);
1865 struct ceph_inode_info *ci = ceph_inode(inode);
1866 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
1867 struct ceph_client *cl = fsc->client;
1868 struct ceph_osd_request *req = NULL;
1869 struct ceph_cap_flush *prealloc_cf = NULL;
1870 struct folio *folio = NULL;
1871 u64 inline_version = CEPH_INLINE_NONE;
1872 struct page *pages[1];
1873 int err = 0;
1874 u64 len;
1875
1876 spin_lock(&ci->i_ceph_lock);
1877 inline_version = ci->i_inline_version;
1878 spin_unlock(&ci->i_ceph_lock);
1879
1880 doutc(cl, "%llx.%llx inline_version %llu\n", ceph_vinop(inode),
1881 inline_version);
1882
1883 if (ceph_inode_is_shutdown(inode)) {
1884 err = -EIO;
1885 goto out;
1886 }
1887
1888 if (inline_version == CEPH_INLINE_NONE)
1889 return 0;
1890
1891 prealloc_cf = ceph_alloc_cap_flush();
1892 if (!prealloc_cf)
1893 return -ENOMEM;
1894
1895 if (inline_version == 1) /* initial version, no data */
1896 goto out_uninline;
1897
1898 folio = read_mapping_folio(inode->i_mapping, 0, file);
1899 if (IS_ERR(folio)) {
1900 err = PTR_ERR(folio);
1901 goto out;
1902 }
1903
1904 folio_lock(folio);
1905
1906 len = i_size_read(inode);
1907 if (len > folio_size(folio))
1908 len = folio_size(folio);
1909
1910 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1911 ceph_vino(inode), 0, &len, 0, 1,
1912 CEPH_OSD_OP_CREATE, CEPH_OSD_FLAG_WRITE,
1913 NULL, 0, 0, false);
1914 if (IS_ERR(req)) {
1915 err = PTR_ERR(req);
1916 goto out_unlock;
1917 }
1918
1919 req->r_mtime = inode_get_mtime(inode);
1920 ceph_osdc_start_request(&fsc->client->osdc, req);
1921 err = ceph_osdc_wait_request(&fsc->client->osdc, req);
1922 ceph_osdc_put_request(req);
1923 if (err < 0)
1924 goto out_unlock;
1925
1926 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1927 ceph_vino(inode), 0, &len, 1, 3,
1928 CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE,
1929 NULL, ci->i_truncate_seq,
1930 ci->i_truncate_size, false);
1931 if (IS_ERR(req)) {
1932 err = PTR_ERR(req);
1933 goto out_unlock;
1934 }
1935
1936 pages[0] = folio_page(folio, 0);
1937 osd_req_op_extent_osd_data_pages(req, 1, pages, len, 0, false, false);
1938
1939 {
1940 __le64 xattr_buf = cpu_to_le64(inline_version);
1941 err = osd_req_op_xattr_init(req, 0, CEPH_OSD_OP_CMPXATTR,
1942 "inline_version", &xattr_buf,
1943 sizeof(xattr_buf),
1944 CEPH_OSD_CMPXATTR_OP_GT,
1945 CEPH_OSD_CMPXATTR_MODE_U64);
1946 if (err)
1947 goto out_put_req;
1948 }
1949
1950 {
1951 char xattr_buf[32];
1952 int xattr_len = snprintf(xattr_buf, sizeof(xattr_buf),
1953 "%llu", inline_version);
1954 err = osd_req_op_xattr_init(req, 2, CEPH_OSD_OP_SETXATTR,
1955 "inline_version",
1956 xattr_buf, xattr_len, 0, 0);
1957 if (err)
1958 goto out_put_req;
1959 }
1960
1961 req->r_mtime = inode_get_mtime(inode);
1962 ceph_osdc_start_request(&fsc->client->osdc, req);
1963 err = ceph_osdc_wait_request(&fsc->client->osdc, req);
1964
1965 ceph_update_write_metrics(&fsc->mdsc->metric, req->r_start_latency,
1966 req->r_end_latency, len, err);
1967
1968 out_uninline:
1969 if (!err) {
1970 int dirty;
1971
1972 /* Set to CAP_INLINE_NONE and dirty the caps */
1973 down_read(&fsc->mdsc->snap_rwsem);
1974 spin_lock(&ci->i_ceph_lock);
1975 ci->i_inline_version = CEPH_INLINE_NONE;
1976 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR, &prealloc_cf);
1977 spin_unlock(&ci->i_ceph_lock);
1978 up_read(&fsc->mdsc->snap_rwsem);
1979 if (dirty)
1980 __mark_inode_dirty(inode, dirty);
1981 }
1982 out_put_req:
1983 ceph_osdc_put_request(req);
1984 if (err == -ECANCELED)
1985 err = 0;
1986 out_unlock:
1987 if (folio) {
1988 folio_unlock(folio);
1989 folio_put(folio);
1990 }
1991 out:
1992 ceph_free_cap_flush(prealloc_cf);
1993 doutc(cl, "%llx.%llx inline_version %llu = %d\n",
1994 ceph_vinop(inode), inline_version, err);
1995 return err;
1996 }
1997
1998 static const struct vm_operations_struct ceph_vmops = {
1999 .fault = ceph_filemap_fault,
2000 .page_mkwrite = ceph_page_mkwrite,
2001 };
2002
ceph_mmap(struct file * file,struct vm_area_struct * vma)2003 int ceph_mmap(struct file *file, struct vm_area_struct *vma)
2004 {
2005 struct address_space *mapping = file->f_mapping;
2006
2007 if (!mapping->a_ops->read_folio)
2008 return -ENOEXEC;
2009 vma->vm_ops = &ceph_vmops;
2010 return 0;
2011 }
2012
2013 enum {
2014 POOL_READ = 1,
2015 POOL_WRITE = 2,
2016 };
2017
__ceph_pool_perm_get(struct ceph_inode_info * ci,s64 pool,struct ceph_string * pool_ns)2018 static int __ceph_pool_perm_get(struct ceph_inode_info *ci,
2019 s64 pool, struct ceph_string *pool_ns)
2020 {
2021 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(&ci->netfs.inode);
2022 struct ceph_mds_client *mdsc = fsc->mdsc;
2023 struct ceph_client *cl = fsc->client;
2024 struct ceph_osd_request *rd_req = NULL, *wr_req = NULL;
2025 struct rb_node **p, *parent;
2026 struct ceph_pool_perm *perm;
2027 struct page **pages;
2028 size_t pool_ns_len;
2029 int err = 0, err2 = 0, have = 0;
2030
2031 down_read(&mdsc->pool_perm_rwsem);
2032 p = &mdsc->pool_perm_tree.rb_node;
2033 while (*p) {
2034 perm = rb_entry(*p, struct ceph_pool_perm, node);
2035 if (pool < perm->pool)
2036 p = &(*p)->rb_left;
2037 else if (pool > perm->pool)
2038 p = &(*p)->rb_right;
2039 else {
2040 int ret = ceph_compare_string(pool_ns,
2041 perm->pool_ns,
2042 perm->pool_ns_len);
2043 if (ret < 0)
2044 p = &(*p)->rb_left;
2045 else if (ret > 0)
2046 p = &(*p)->rb_right;
2047 else {
2048 have = perm->perm;
2049 break;
2050 }
2051 }
2052 }
2053 up_read(&mdsc->pool_perm_rwsem);
2054 if (*p)
2055 goto out;
2056
2057 if (pool_ns)
2058 doutc(cl, "pool %lld ns %.*s no perm cached\n", pool,
2059 (int)pool_ns->len, pool_ns->str);
2060 else
2061 doutc(cl, "pool %lld no perm cached\n", pool);
2062
2063 down_write(&mdsc->pool_perm_rwsem);
2064 p = &mdsc->pool_perm_tree.rb_node;
2065 parent = NULL;
2066 while (*p) {
2067 parent = *p;
2068 perm = rb_entry(parent, struct ceph_pool_perm, node);
2069 if (pool < perm->pool)
2070 p = &(*p)->rb_left;
2071 else if (pool > perm->pool)
2072 p = &(*p)->rb_right;
2073 else {
2074 int ret = ceph_compare_string(pool_ns,
2075 perm->pool_ns,
2076 perm->pool_ns_len);
2077 if (ret < 0)
2078 p = &(*p)->rb_left;
2079 else if (ret > 0)
2080 p = &(*p)->rb_right;
2081 else {
2082 have = perm->perm;
2083 break;
2084 }
2085 }
2086 }
2087 if (*p) {
2088 up_write(&mdsc->pool_perm_rwsem);
2089 goto out;
2090 }
2091
2092 rd_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL,
2093 1, false, GFP_NOFS);
2094 if (!rd_req) {
2095 err = -ENOMEM;
2096 goto out_unlock;
2097 }
2098
2099 rd_req->r_flags = CEPH_OSD_FLAG_READ;
2100 osd_req_op_init(rd_req, 0, CEPH_OSD_OP_STAT, 0);
2101 rd_req->r_base_oloc.pool = pool;
2102 if (pool_ns)
2103 rd_req->r_base_oloc.pool_ns = ceph_get_string(pool_ns);
2104 ceph_oid_printf(&rd_req->r_base_oid, "%llx.00000000", ci->i_vino.ino);
2105
2106 err = ceph_osdc_alloc_messages(rd_req, GFP_NOFS);
2107 if (err)
2108 goto out_unlock;
2109
2110 wr_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL,
2111 1, false, GFP_NOFS);
2112 if (!wr_req) {
2113 err = -ENOMEM;
2114 goto out_unlock;
2115 }
2116
2117 wr_req->r_flags = CEPH_OSD_FLAG_WRITE;
2118 osd_req_op_init(wr_req, 0, CEPH_OSD_OP_CREATE, CEPH_OSD_OP_FLAG_EXCL);
2119 ceph_oloc_copy(&wr_req->r_base_oloc, &rd_req->r_base_oloc);
2120 ceph_oid_copy(&wr_req->r_base_oid, &rd_req->r_base_oid);
2121
2122 err = ceph_osdc_alloc_messages(wr_req, GFP_NOFS);
2123 if (err)
2124 goto out_unlock;
2125
2126 /* one page should be large enough for STAT data */
2127 pages = ceph_alloc_page_vector(1, GFP_KERNEL);
2128 if (IS_ERR(pages)) {
2129 err = PTR_ERR(pages);
2130 goto out_unlock;
2131 }
2132
2133 osd_req_op_raw_data_in_pages(rd_req, 0, pages, PAGE_SIZE,
2134 0, false, true);
2135 ceph_osdc_start_request(&fsc->client->osdc, rd_req);
2136
2137 wr_req->r_mtime = inode_get_mtime(&ci->netfs.inode);
2138 ceph_osdc_start_request(&fsc->client->osdc, wr_req);
2139
2140 err = ceph_osdc_wait_request(&fsc->client->osdc, rd_req);
2141 err2 = ceph_osdc_wait_request(&fsc->client->osdc, wr_req);
2142
2143 if (err >= 0 || err == -ENOENT)
2144 have |= POOL_READ;
2145 else if (err != -EPERM) {
2146 if (err == -EBLOCKLISTED)
2147 fsc->blocklisted = true;
2148 goto out_unlock;
2149 }
2150
2151 if (err2 == 0 || err2 == -EEXIST)
2152 have |= POOL_WRITE;
2153 else if (err2 != -EPERM) {
2154 if (err2 == -EBLOCKLISTED)
2155 fsc->blocklisted = true;
2156 err = err2;
2157 goto out_unlock;
2158 }
2159
2160 pool_ns_len = pool_ns ? pool_ns->len : 0;
2161 perm = kmalloc(struct_size(perm, pool_ns, pool_ns_len + 1), GFP_NOFS);
2162 if (!perm) {
2163 err = -ENOMEM;
2164 goto out_unlock;
2165 }
2166
2167 perm->pool = pool;
2168 perm->perm = have;
2169 perm->pool_ns_len = pool_ns_len;
2170 if (pool_ns_len > 0)
2171 memcpy(perm->pool_ns, pool_ns->str, pool_ns_len);
2172 perm->pool_ns[pool_ns_len] = 0;
2173
2174 rb_link_node(&perm->node, parent, p);
2175 rb_insert_color(&perm->node, &mdsc->pool_perm_tree);
2176 err = 0;
2177 out_unlock:
2178 up_write(&mdsc->pool_perm_rwsem);
2179
2180 ceph_osdc_put_request(rd_req);
2181 ceph_osdc_put_request(wr_req);
2182 out:
2183 if (!err)
2184 err = have;
2185 if (pool_ns)
2186 doutc(cl, "pool %lld ns %.*s result = %d\n", pool,
2187 (int)pool_ns->len, pool_ns->str, err);
2188 else
2189 doutc(cl, "pool %lld result = %d\n", pool, err);
2190 return err;
2191 }
2192
ceph_pool_perm_check(struct inode * inode,int need)2193 int ceph_pool_perm_check(struct inode *inode, int need)
2194 {
2195 struct ceph_client *cl = ceph_inode_to_client(inode);
2196 struct ceph_inode_info *ci = ceph_inode(inode);
2197 struct ceph_string *pool_ns;
2198 s64 pool;
2199 int ret, flags;
2200
2201 /* Only need to do this for regular files */
2202 if (!S_ISREG(inode->i_mode))
2203 return 0;
2204
2205 if (ci->i_vino.snap != CEPH_NOSNAP) {
2206 /*
2207 * Pool permission check needs to write to the first object.
2208 * But for snapshot, head of the first object may have already
2209 * been deleted. Skip check to avoid creating orphan object.
2210 */
2211 return 0;
2212 }
2213
2214 if (ceph_test_mount_opt(ceph_inode_to_fs_client(inode),
2215 NOPOOLPERM))
2216 return 0;
2217
2218 spin_lock(&ci->i_ceph_lock);
2219 flags = ci->i_ceph_flags;
2220 pool = ci->i_layout.pool_id;
2221 spin_unlock(&ci->i_ceph_lock);
2222 check:
2223 if (flags & CEPH_I_POOL_PERM) {
2224 if ((need & CEPH_CAP_FILE_RD) && !(flags & CEPH_I_POOL_RD)) {
2225 doutc(cl, "pool %lld no read perm\n", pool);
2226 return -EPERM;
2227 }
2228 if ((need & CEPH_CAP_FILE_WR) && !(flags & CEPH_I_POOL_WR)) {
2229 doutc(cl, "pool %lld no write perm\n", pool);
2230 return -EPERM;
2231 }
2232 return 0;
2233 }
2234
2235 pool_ns = ceph_try_get_string(ci->i_layout.pool_ns);
2236 ret = __ceph_pool_perm_get(ci, pool, pool_ns);
2237 ceph_put_string(pool_ns);
2238 if (ret < 0)
2239 return ret;
2240
2241 flags = CEPH_I_POOL_PERM;
2242 if (ret & POOL_READ)
2243 flags |= CEPH_I_POOL_RD;
2244 if (ret & POOL_WRITE)
2245 flags |= CEPH_I_POOL_WR;
2246
2247 spin_lock(&ci->i_ceph_lock);
2248 if (pool == ci->i_layout.pool_id &&
2249 pool_ns == rcu_dereference_raw(ci->i_layout.pool_ns)) {
2250 ci->i_ceph_flags |= flags;
2251 } else {
2252 pool = ci->i_layout.pool_id;
2253 flags = ci->i_ceph_flags;
2254 }
2255 spin_unlock(&ci->i_ceph_lock);
2256 goto check;
2257 }
2258
ceph_pool_perm_destroy(struct ceph_mds_client * mdsc)2259 void ceph_pool_perm_destroy(struct ceph_mds_client *mdsc)
2260 {
2261 struct ceph_pool_perm *perm;
2262 struct rb_node *n;
2263
2264 while (!RB_EMPTY_ROOT(&mdsc->pool_perm_tree)) {
2265 n = rb_first(&mdsc->pool_perm_tree);
2266 perm = rb_entry(n, struct ceph_pool_perm, node);
2267 rb_erase(n, &mdsc->pool_perm_tree);
2268 kfree(perm);
2269 }
2270 }
2271