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 err = 0;
228 else if (err == -EBLOCKLISTED)
229 fsc->blocklisted = true;
230
231 if (err >= 0) {
232 if (sparse && err > 0)
233 err = ceph_sparse_ext_map_end(op);
234 if (err < subreq->len &&
235 subreq->rreq->origin != NETFS_DIO_READ)
236 __set_bit(NETFS_SREQ_CLEAR_TAIL, &subreq->flags);
237 if (IS_ENCRYPTED(inode) && err > 0) {
238 err = ceph_fscrypt_decrypt_extents(inode,
239 osd_data->pages, subreq->start,
240 op->extent.sparse_ext,
241 op->extent.sparse_ext_cnt);
242 if (err > subreq->len)
243 err = subreq->len;
244 }
245 }
246
247 if (osd_data->type == CEPH_OSD_DATA_TYPE_PAGES) {
248 ceph_put_page_vector(osd_data->pages,
249 calc_pages_for(osd_data->alignment,
250 osd_data->length), false);
251 }
252 if (err > 0) {
253 subreq->transferred = err;
254 err = 0;
255 }
256 trace_netfs_sreq(subreq, netfs_sreq_trace_io_progress);
257 netfs_read_subreq_terminated(subreq, err, false);
258 iput(req->r_inode);
259 ceph_dec_osd_stopping_blocker(fsc->mdsc);
260 }
261
ceph_netfs_issue_op_inline(struct netfs_io_subrequest * subreq)262 static bool ceph_netfs_issue_op_inline(struct netfs_io_subrequest *subreq)
263 {
264 struct netfs_io_request *rreq = subreq->rreq;
265 struct inode *inode = rreq->inode;
266 struct ceph_mds_reply_info_parsed *rinfo;
267 struct ceph_mds_reply_info_in *iinfo;
268 struct ceph_mds_request *req;
269 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
270 struct ceph_inode_info *ci = ceph_inode(inode);
271 ssize_t err = 0;
272 size_t len;
273 int mode;
274
275 if (rreq->origin != NETFS_DIO_READ)
276 __set_bit(NETFS_SREQ_CLEAR_TAIL, &subreq->flags);
277 __clear_bit(NETFS_SREQ_COPY_TO_CACHE, &subreq->flags);
278
279 if (subreq->start >= inode->i_size)
280 goto out;
281
282 /* We need to fetch the inline data. */
283 mode = ceph_try_to_choose_auth_mds(inode, CEPH_STAT_CAP_INLINE_DATA);
284 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, mode);
285 if (IS_ERR(req)) {
286 err = PTR_ERR(req);
287 goto out;
288 }
289 req->r_ino1 = ci->i_vino;
290 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INLINE_DATA);
291 req->r_num_caps = 2;
292
293 trace_netfs_sreq(subreq, netfs_sreq_trace_submit);
294 err = ceph_mdsc_do_request(mdsc, NULL, req);
295 if (err < 0)
296 goto out;
297
298 rinfo = &req->r_reply_info;
299 iinfo = &rinfo->targeti;
300 if (iinfo->inline_version == CEPH_INLINE_NONE) {
301 /* The data got uninlined */
302 ceph_mdsc_put_request(req);
303 return false;
304 }
305
306 len = min_t(size_t, iinfo->inline_len - subreq->start, subreq->len);
307 err = copy_to_iter(iinfo->inline_data + subreq->start, len, &subreq->io_iter);
308 if (err == 0) {
309 err = -EFAULT;
310 } else {
311 subreq->transferred += err;
312 err = 0;
313 }
314
315 ceph_mdsc_put_request(req);
316 out:
317 netfs_read_subreq_terminated(subreq, err, false);
318 return true;
319 }
320
ceph_netfs_prepare_read(struct netfs_io_subrequest * subreq)321 static int ceph_netfs_prepare_read(struct netfs_io_subrequest *subreq)
322 {
323 struct netfs_io_request *rreq = subreq->rreq;
324 struct inode *inode = rreq->inode;
325 struct ceph_inode_info *ci = ceph_inode(inode);
326 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
327 u64 objno, objoff;
328 u32 xlen;
329
330 /* Truncate the extent at the end of the current block */
331 ceph_calc_file_object_mapping(&ci->i_layout, subreq->start, subreq->len,
332 &objno, &objoff, &xlen);
333 rreq->io_streams[0].sreq_max_len = umin(xlen, fsc->mount_options->rsize);
334 return 0;
335 }
336
ceph_netfs_issue_read(struct netfs_io_subrequest * subreq)337 static void ceph_netfs_issue_read(struct netfs_io_subrequest *subreq)
338 {
339 struct netfs_io_request *rreq = subreq->rreq;
340 struct inode *inode = rreq->inode;
341 struct ceph_inode_info *ci = ceph_inode(inode);
342 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
343 struct ceph_client *cl = fsc->client;
344 struct ceph_osd_request *req = NULL;
345 struct ceph_vino vino = ceph_vino(inode);
346 int err;
347 u64 len;
348 bool sparse = IS_ENCRYPTED(inode) || ceph_test_mount_opt(fsc, SPARSEREAD);
349 u64 off = subreq->start;
350 int extent_cnt;
351
352 if (ceph_inode_is_shutdown(inode)) {
353 err = -EIO;
354 goto out;
355 }
356
357 if (ceph_has_inline_data(ci) && ceph_netfs_issue_op_inline(subreq))
358 return;
359
360 // TODO: This rounding here is slightly dodgy. It *should* work, for
361 // now, as the cache only deals in blocks that are a multiple of
362 // PAGE_SIZE and fscrypt blocks are at most PAGE_SIZE. What needs to
363 // happen is for the fscrypt driving to be moved into netfslib and the
364 // data in the cache also to be stored encrypted.
365 len = subreq->len;
366 ceph_fscrypt_adjust_off_and_len(inode, &off, &len);
367
368 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, vino,
369 off, &len, 0, 1, sparse ? CEPH_OSD_OP_SPARSE_READ : CEPH_OSD_OP_READ,
370 CEPH_OSD_FLAG_READ, NULL, ci->i_truncate_seq,
371 ci->i_truncate_size, false);
372 if (IS_ERR(req)) {
373 err = PTR_ERR(req);
374 req = NULL;
375 goto out;
376 }
377
378 if (sparse) {
379 extent_cnt = __ceph_sparse_read_ext_count(inode, len);
380 err = ceph_alloc_sparse_ext_map(&req->r_ops[0], extent_cnt);
381 if (err)
382 goto out;
383 }
384
385 doutc(cl, "%llx.%llx pos=%llu orig_len=%zu len=%llu\n",
386 ceph_vinop(inode), subreq->start, subreq->len, len);
387
388 /*
389 * FIXME: For now, use CEPH_OSD_DATA_TYPE_PAGES instead of _ITER for
390 * encrypted inodes. We'd need infrastructure that handles an iov_iter
391 * instead of page arrays, and we don't have that as of yet. Once the
392 * dust settles on the write helpers and encrypt/decrypt routines for
393 * netfs, we should be able to rework this.
394 */
395 if (IS_ENCRYPTED(inode)) {
396 struct page **pages;
397 size_t page_off;
398
399 /*
400 * FIXME: io_iter.count needs to be corrected to aligned
401 * length. Otherwise, iov_iter_get_pages_alloc2() operates
402 * with the initial unaligned length value. As a result,
403 * ceph_msg_data_cursor_init() triggers BUG_ON() in the case
404 * if msg->sparse_read_total > msg->data_length.
405 */
406 subreq->io_iter.count = len;
407
408 err = iov_iter_get_pages_alloc2(&subreq->io_iter, &pages, len, &page_off);
409 if (err < 0) {
410 doutc(cl, "%llx.%llx failed to allocate pages, %d\n",
411 ceph_vinop(inode), err);
412 goto out;
413 }
414
415 /* should always give us a page-aligned read */
416 WARN_ON_ONCE(page_off);
417 len = err;
418 err = 0;
419
420 osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0, false,
421 false);
422 } else {
423 osd_req_op_extent_osd_iter(req, 0, &subreq->io_iter);
424 }
425 if (!ceph_inc_osd_stopping_blocker(fsc->mdsc)) {
426 err = -EIO;
427 goto out;
428 }
429 req->r_callback = finish_netfs_read;
430 req->r_priv = subreq;
431 req->r_inode = inode;
432 ihold(inode);
433
434 trace_netfs_sreq(subreq, netfs_sreq_trace_submit);
435 ceph_osdc_start_request(req->r_osdc, req);
436 out:
437 ceph_osdc_put_request(req);
438 if (err)
439 netfs_read_subreq_terminated(subreq, err, false);
440 doutc(cl, "%llx.%llx result %d\n", ceph_vinop(inode), err);
441 }
442
ceph_init_request(struct netfs_io_request * rreq,struct file * file)443 static int ceph_init_request(struct netfs_io_request *rreq, struct file *file)
444 {
445 struct inode *inode = rreq->inode;
446 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
447 struct ceph_client *cl = ceph_inode_to_client(inode);
448 int got = 0, want = CEPH_CAP_FILE_CACHE;
449 struct ceph_netfs_request_data *priv;
450 int ret = 0;
451
452 /* [DEPRECATED] Use PG_private_2 to mark folio being written to the cache. */
453 __set_bit(NETFS_RREQ_USE_PGPRIV2, &rreq->flags);
454
455 if (rreq->origin != NETFS_READAHEAD)
456 return 0;
457
458 priv = kzalloc(sizeof(*priv), GFP_NOFS);
459 if (!priv)
460 return -ENOMEM;
461
462 if (file) {
463 struct ceph_rw_context *rw_ctx;
464 struct ceph_file_info *fi = file->private_data;
465
466 priv->file_ra_pages = file->f_ra.ra_pages;
467 priv->file_ra_disabled = file->f_mode & FMODE_RANDOM;
468
469 rw_ctx = ceph_find_rw_context(fi);
470 if (rw_ctx) {
471 rreq->netfs_priv = priv;
472 return 0;
473 }
474 }
475
476 /*
477 * readahead callers do not necessarily hold Fcb caps
478 * (e.g. fadvise, madvise).
479 */
480 ret = ceph_try_get_caps(inode, CEPH_CAP_FILE_RD, want, true, &got);
481 if (ret < 0) {
482 doutc(cl, "%llx.%llx, error getting cap\n", ceph_vinop(inode));
483 goto out;
484 }
485
486 if (!(got & want)) {
487 doutc(cl, "%llx.%llx, no cache cap\n", ceph_vinop(inode));
488 ret = -EACCES;
489 goto out;
490 }
491 if (ret == 0) {
492 ret = -EACCES;
493 goto out;
494 }
495
496 priv->caps = got;
497 rreq->netfs_priv = priv;
498 rreq->io_streams[0].sreq_max_len = fsc->mount_options->rsize;
499
500 out:
501 if (ret < 0) {
502 if (got)
503 ceph_put_cap_refs(ceph_inode(inode), got);
504 kfree(priv);
505 }
506
507 return ret;
508 }
509
ceph_netfs_free_request(struct netfs_io_request * rreq)510 static void ceph_netfs_free_request(struct netfs_io_request *rreq)
511 {
512 struct ceph_netfs_request_data *priv = rreq->netfs_priv;
513
514 if (!priv)
515 return;
516
517 if (priv->caps)
518 ceph_put_cap_refs(ceph_inode(rreq->inode), priv->caps);
519 kfree(priv);
520 rreq->netfs_priv = NULL;
521 }
522
523 const struct netfs_request_ops ceph_netfs_ops = {
524 .init_request = ceph_init_request,
525 .free_request = ceph_netfs_free_request,
526 .prepare_read = ceph_netfs_prepare_read,
527 .issue_read = ceph_netfs_issue_read,
528 .expand_readahead = ceph_netfs_expand_readahead,
529 .check_write_begin = ceph_netfs_check_write_begin,
530 };
531
532 #ifdef CONFIG_CEPH_FSCACHE
ceph_set_page_fscache(struct page * page)533 static void ceph_set_page_fscache(struct page *page)
534 {
535 folio_start_private_2(page_folio(page)); /* [DEPRECATED] */
536 }
537
ceph_fscache_write_terminated(void * priv,ssize_t error,bool was_async)538 static void ceph_fscache_write_terminated(void *priv, ssize_t error, bool was_async)
539 {
540 struct inode *inode = priv;
541
542 if (IS_ERR_VALUE(error) && error != -ENOBUFS)
543 ceph_fscache_invalidate(inode, false);
544 }
545
ceph_fscache_write_to_cache(struct inode * inode,u64 off,u64 len,bool caching)546 static void ceph_fscache_write_to_cache(struct inode *inode, u64 off, u64 len, bool caching)
547 {
548 struct ceph_inode_info *ci = ceph_inode(inode);
549 struct fscache_cookie *cookie = ceph_fscache_cookie(ci);
550
551 fscache_write_to_cache(cookie, inode->i_mapping, off, len, i_size_read(inode),
552 ceph_fscache_write_terminated, inode, true, caching);
553 }
554 #else
ceph_set_page_fscache(struct page * page)555 static inline void ceph_set_page_fscache(struct page *page)
556 {
557 }
558
ceph_fscache_write_to_cache(struct inode * inode,u64 off,u64 len,bool caching)559 static inline void ceph_fscache_write_to_cache(struct inode *inode, u64 off, u64 len, bool caching)
560 {
561 }
562 #endif /* CONFIG_CEPH_FSCACHE */
563
564 struct ceph_writeback_ctl
565 {
566 loff_t i_size;
567 u64 truncate_size;
568 u32 truncate_seq;
569 bool size_stable;
570 bool head_snapc;
571 };
572
573 /*
574 * Get ref for the oldest snapc for an inode with dirty data... that is, the
575 * only snap context we are allowed to write back.
576 */
577 static struct ceph_snap_context *
get_oldest_context(struct inode * inode,struct ceph_writeback_ctl * ctl,struct ceph_snap_context * page_snapc)578 get_oldest_context(struct inode *inode, struct ceph_writeback_ctl *ctl,
579 struct ceph_snap_context *page_snapc)
580 {
581 struct ceph_inode_info *ci = ceph_inode(inode);
582 struct ceph_client *cl = ceph_inode_to_client(inode);
583 struct ceph_snap_context *snapc = NULL;
584 struct ceph_cap_snap *capsnap = NULL;
585
586 spin_lock(&ci->i_ceph_lock);
587 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
588 doutc(cl, " capsnap %p snapc %p has %d dirty pages\n",
589 capsnap, capsnap->context, capsnap->dirty_pages);
590 if (!capsnap->dirty_pages)
591 continue;
592
593 /* get i_size, truncate_{seq,size} for page_snapc? */
594 if (snapc && capsnap->context != page_snapc)
595 continue;
596
597 if (ctl) {
598 if (capsnap->writing) {
599 ctl->i_size = i_size_read(inode);
600 ctl->size_stable = false;
601 } else {
602 ctl->i_size = capsnap->size;
603 ctl->size_stable = true;
604 }
605 ctl->truncate_size = capsnap->truncate_size;
606 ctl->truncate_seq = capsnap->truncate_seq;
607 ctl->head_snapc = false;
608 }
609
610 if (snapc)
611 break;
612
613 snapc = ceph_get_snap_context(capsnap->context);
614 if (!page_snapc ||
615 page_snapc == snapc ||
616 page_snapc->seq > snapc->seq)
617 break;
618 }
619 if (!snapc && ci->i_wrbuffer_ref_head) {
620 snapc = ceph_get_snap_context(ci->i_head_snapc);
621 doutc(cl, " head snapc %p has %d dirty pages\n", snapc,
622 ci->i_wrbuffer_ref_head);
623 if (ctl) {
624 ctl->i_size = i_size_read(inode);
625 ctl->truncate_size = ci->i_truncate_size;
626 ctl->truncate_seq = ci->i_truncate_seq;
627 ctl->size_stable = false;
628 ctl->head_snapc = true;
629 }
630 }
631 spin_unlock(&ci->i_ceph_lock);
632 return snapc;
633 }
634
get_writepages_data_length(struct inode * inode,struct page * page,u64 start)635 static u64 get_writepages_data_length(struct inode *inode,
636 struct page *page, u64 start)
637 {
638 struct ceph_inode_info *ci = ceph_inode(inode);
639 struct ceph_snap_context *snapc;
640 struct ceph_cap_snap *capsnap = NULL;
641 u64 end = i_size_read(inode);
642 u64 ret;
643
644 snapc = page_snap_context(ceph_fscrypt_pagecache_page(page));
645 if (snapc != ci->i_head_snapc) {
646 bool found = false;
647 spin_lock(&ci->i_ceph_lock);
648 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
649 if (capsnap->context == snapc) {
650 if (!capsnap->writing)
651 end = capsnap->size;
652 found = true;
653 break;
654 }
655 }
656 spin_unlock(&ci->i_ceph_lock);
657 WARN_ON(!found);
658 }
659 if (end > ceph_fscrypt_page_offset(page) + thp_size(page))
660 end = ceph_fscrypt_page_offset(page) + thp_size(page);
661 ret = end > start ? end - start : 0;
662 if (ret && fscrypt_is_bounce_page(page))
663 ret = round_up(ret, CEPH_FSCRYPT_BLOCK_SIZE);
664 return ret;
665 }
666
667 /*
668 * Write a single page, but leave the page locked.
669 *
670 * If we get a write error, mark the mapping for error, but still adjust the
671 * dirty page accounting (i.e., page is no longer dirty).
672 */
writepage_nounlock(struct page * page,struct writeback_control * wbc)673 static int writepage_nounlock(struct page *page, struct writeback_control *wbc)
674 {
675 struct folio *folio = page_folio(page);
676 struct inode *inode = page->mapping->host;
677 struct ceph_inode_info *ci = ceph_inode(inode);
678 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
679 struct ceph_client *cl = fsc->client;
680 struct ceph_snap_context *snapc, *oldest;
681 loff_t page_off = page_offset(page);
682 int err;
683 loff_t len = thp_size(page);
684 loff_t wlen;
685 struct ceph_writeback_ctl ceph_wbc;
686 struct ceph_osd_client *osdc = &fsc->client->osdc;
687 struct ceph_osd_request *req;
688 bool caching = ceph_is_cache_enabled(inode);
689 struct page *bounce_page = NULL;
690
691 doutc(cl, "%llx.%llx page %p idx %lu\n", ceph_vinop(inode), page,
692 page->index);
693
694 if (ceph_inode_is_shutdown(inode))
695 return -EIO;
696
697 /* verify this is a writeable snap context */
698 snapc = page_snap_context(page);
699 if (!snapc) {
700 doutc(cl, "%llx.%llx page %p not dirty?\n", ceph_vinop(inode),
701 page);
702 return 0;
703 }
704 oldest = get_oldest_context(inode, &ceph_wbc, snapc);
705 if (snapc->seq > oldest->seq) {
706 doutc(cl, "%llx.%llx page %p snapc %p not writeable - noop\n",
707 ceph_vinop(inode), page, snapc);
708 /* we should only noop if called by kswapd */
709 WARN_ON(!(current->flags & PF_MEMALLOC));
710 ceph_put_snap_context(oldest);
711 redirty_page_for_writepage(wbc, page);
712 return 0;
713 }
714 ceph_put_snap_context(oldest);
715
716 /* is this a partial page at end of file? */
717 if (page_off >= ceph_wbc.i_size) {
718 doutc(cl, "%llx.%llx folio at %lu beyond eof %llu\n",
719 ceph_vinop(inode), folio->index, ceph_wbc.i_size);
720 folio_invalidate(folio, 0, folio_size(folio));
721 return 0;
722 }
723
724 if (ceph_wbc.i_size < page_off + len)
725 len = ceph_wbc.i_size - page_off;
726
727 wlen = IS_ENCRYPTED(inode) ? round_up(len, CEPH_FSCRYPT_BLOCK_SIZE) : len;
728 doutc(cl, "%llx.%llx page %p index %lu on %llu~%llu snapc %p seq %lld\n",
729 ceph_vinop(inode), page, page->index, page_off, wlen, snapc,
730 snapc->seq);
731
732 if (atomic_long_inc_return(&fsc->writeback_count) >
733 CONGESTION_ON_THRESH(fsc->mount_options->congestion_kb))
734 fsc->write_congested = true;
735
736 req = ceph_osdc_new_request(osdc, &ci->i_layout, ceph_vino(inode),
737 page_off, &wlen, 0, 1, CEPH_OSD_OP_WRITE,
738 CEPH_OSD_FLAG_WRITE, snapc,
739 ceph_wbc.truncate_seq,
740 ceph_wbc.truncate_size, true);
741 if (IS_ERR(req)) {
742 redirty_page_for_writepage(wbc, page);
743 return PTR_ERR(req);
744 }
745
746 if (wlen < len)
747 len = wlen;
748
749 set_page_writeback(page);
750 if (caching)
751 ceph_set_page_fscache(page);
752 ceph_fscache_write_to_cache(inode, page_off, len, caching);
753
754 if (IS_ENCRYPTED(inode)) {
755 bounce_page = fscrypt_encrypt_pagecache_blocks(page,
756 CEPH_FSCRYPT_BLOCK_SIZE, 0,
757 GFP_NOFS);
758 if (IS_ERR(bounce_page)) {
759 redirty_page_for_writepage(wbc, page);
760 end_page_writeback(page);
761 ceph_osdc_put_request(req);
762 return PTR_ERR(bounce_page);
763 }
764 }
765
766 /* it may be a short write due to an object boundary */
767 WARN_ON_ONCE(len > thp_size(page));
768 osd_req_op_extent_osd_data_pages(req, 0,
769 bounce_page ? &bounce_page : &page, wlen, 0,
770 false, false);
771 doutc(cl, "%llx.%llx %llu~%llu (%llu bytes, %sencrypted)\n",
772 ceph_vinop(inode), page_off, len, wlen,
773 IS_ENCRYPTED(inode) ? "" : "not ");
774
775 req->r_mtime = inode_get_mtime(inode);
776 ceph_osdc_start_request(osdc, req);
777 err = ceph_osdc_wait_request(osdc, req);
778
779 ceph_update_write_metrics(&fsc->mdsc->metric, req->r_start_latency,
780 req->r_end_latency, len, err);
781 fscrypt_free_bounce_page(bounce_page);
782 ceph_osdc_put_request(req);
783 if (err == 0)
784 err = len;
785
786 if (err < 0) {
787 struct writeback_control tmp_wbc;
788 if (!wbc)
789 wbc = &tmp_wbc;
790 if (err == -ERESTARTSYS) {
791 /* killed by SIGKILL */
792 doutc(cl, "%llx.%llx interrupted page %p\n",
793 ceph_vinop(inode), page);
794 redirty_page_for_writepage(wbc, page);
795 end_page_writeback(page);
796 return err;
797 }
798 if (err == -EBLOCKLISTED)
799 fsc->blocklisted = true;
800 doutc(cl, "%llx.%llx setting page/mapping error %d %p\n",
801 ceph_vinop(inode), err, page);
802 mapping_set_error(&inode->i_data, err);
803 wbc->pages_skipped++;
804 } else {
805 doutc(cl, "%llx.%llx cleaned page %p\n",
806 ceph_vinop(inode), page);
807 err = 0; /* vfs expects us to return 0 */
808 }
809 oldest = detach_page_private(page);
810 WARN_ON_ONCE(oldest != snapc);
811 end_page_writeback(page);
812 ceph_put_wrbuffer_cap_refs(ci, 1, snapc);
813 ceph_put_snap_context(snapc); /* page's reference */
814
815 if (atomic_long_dec_return(&fsc->writeback_count) <
816 CONGESTION_OFF_THRESH(fsc->mount_options->congestion_kb))
817 fsc->write_congested = false;
818
819 return err;
820 }
821
ceph_writepage(struct page * page,struct writeback_control * wbc)822 static int ceph_writepage(struct page *page, struct writeback_control *wbc)
823 {
824 int err;
825 struct inode *inode = page->mapping->host;
826 BUG_ON(!inode);
827 ihold(inode);
828
829 if (wbc->sync_mode == WB_SYNC_NONE &&
830 ceph_inode_to_fs_client(inode)->write_congested) {
831 redirty_page_for_writepage(wbc, page);
832 return AOP_WRITEPAGE_ACTIVATE;
833 }
834
835 folio_wait_private_2(page_folio(page)); /* [DEPRECATED] */
836
837 err = writepage_nounlock(page, wbc);
838 if (err == -ERESTARTSYS) {
839 /* direct memory reclaimer was killed by SIGKILL. return 0
840 * to prevent caller from setting mapping/page error */
841 err = 0;
842 }
843 unlock_page(page);
844 iput(inode);
845 return err;
846 }
847
848 /*
849 * async writeback completion handler.
850 *
851 * If we get an error, set the mapping error bit, but not the individual
852 * page error bits.
853 */
writepages_finish(struct ceph_osd_request * req)854 static void writepages_finish(struct ceph_osd_request *req)
855 {
856 struct inode *inode = req->r_inode;
857 struct ceph_inode_info *ci = ceph_inode(inode);
858 struct ceph_client *cl = ceph_inode_to_client(inode);
859 struct ceph_osd_data *osd_data;
860 struct page *page;
861 int num_pages, total_pages = 0;
862 int i, j;
863 int rc = req->r_result;
864 struct ceph_snap_context *snapc = req->r_snapc;
865 struct address_space *mapping = inode->i_mapping;
866 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
867 unsigned int len = 0;
868 bool remove_page;
869
870 doutc(cl, "%llx.%llx rc %d\n", ceph_vinop(inode), rc);
871 if (rc < 0) {
872 mapping_set_error(mapping, rc);
873 ceph_set_error_write(ci);
874 if (rc == -EBLOCKLISTED)
875 fsc->blocklisted = true;
876 } else {
877 ceph_clear_error_write(ci);
878 }
879
880 /*
881 * We lost the cache cap, need to truncate the page before
882 * it is unlocked, otherwise we'd truncate it later in the
883 * page truncation thread, possibly losing some data that
884 * raced its way in
885 */
886 remove_page = !(ceph_caps_issued(ci) &
887 (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO));
888
889 /* clean all pages */
890 for (i = 0; i < req->r_num_ops; i++) {
891 if (req->r_ops[i].op != CEPH_OSD_OP_WRITE) {
892 pr_warn_client(cl,
893 "%llx.%llx incorrect op %d req %p index %d tid %llu\n",
894 ceph_vinop(inode), req->r_ops[i].op, req, i,
895 req->r_tid);
896 break;
897 }
898
899 osd_data = osd_req_op_extent_osd_data(req, i);
900 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_PAGES);
901 len += osd_data->length;
902 num_pages = calc_pages_for((u64)osd_data->alignment,
903 (u64)osd_data->length);
904 total_pages += num_pages;
905 for (j = 0; j < num_pages; j++) {
906 page = osd_data->pages[j];
907 if (fscrypt_is_bounce_page(page)) {
908 page = fscrypt_pagecache_page(page);
909 fscrypt_free_bounce_page(osd_data->pages[j]);
910 osd_data->pages[j] = page;
911 }
912 BUG_ON(!page);
913 WARN_ON(!PageUptodate(page));
914
915 if (atomic_long_dec_return(&fsc->writeback_count) <
916 CONGESTION_OFF_THRESH(
917 fsc->mount_options->congestion_kb))
918 fsc->write_congested = false;
919
920 ceph_put_snap_context(detach_page_private(page));
921 end_page_writeback(page);
922 doutc(cl, "unlocking %p\n", page);
923
924 if (remove_page)
925 generic_error_remove_folio(inode->i_mapping,
926 page_folio(page));
927
928 unlock_page(page);
929 }
930 doutc(cl, "%llx.%llx wrote %llu bytes cleaned %d pages\n",
931 ceph_vinop(inode), osd_data->length,
932 rc >= 0 ? num_pages : 0);
933
934 release_pages(osd_data->pages, num_pages);
935 }
936
937 ceph_update_write_metrics(&fsc->mdsc->metric, req->r_start_latency,
938 req->r_end_latency, len, rc);
939
940 ceph_put_wrbuffer_cap_refs(ci, total_pages, snapc);
941
942 osd_data = osd_req_op_extent_osd_data(req, 0);
943 if (osd_data->pages_from_pool)
944 mempool_free(osd_data->pages, ceph_wb_pagevec_pool);
945 else
946 kfree(osd_data->pages);
947 ceph_osdc_put_request(req);
948 ceph_dec_osd_stopping_blocker(fsc->mdsc);
949 }
950
951 /*
952 * initiate async writeback
953 */
ceph_writepages_start(struct address_space * mapping,struct writeback_control * wbc)954 static int ceph_writepages_start(struct address_space *mapping,
955 struct writeback_control *wbc)
956 {
957 struct inode *inode = mapping->host;
958 struct ceph_inode_info *ci = ceph_inode(inode);
959 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
960 struct ceph_client *cl = fsc->client;
961 struct ceph_vino vino = ceph_vino(inode);
962 pgoff_t index, start_index, end = -1;
963 struct ceph_snap_context *snapc = NULL, *last_snapc = NULL, *pgsnapc;
964 struct folio_batch fbatch;
965 int rc = 0;
966 unsigned int wsize = i_blocksize(inode);
967 struct ceph_osd_request *req = NULL;
968 struct ceph_writeback_ctl ceph_wbc;
969 bool should_loop, range_whole = false;
970 bool done = false;
971 bool caching = ceph_is_cache_enabled(inode);
972 xa_mark_t tag;
973
974 if (wbc->sync_mode == WB_SYNC_NONE &&
975 fsc->write_congested)
976 return 0;
977
978 doutc(cl, "%llx.%llx (mode=%s)\n", ceph_vinop(inode),
979 wbc->sync_mode == WB_SYNC_NONE ? "NONE" :
980 (wbc->sync_mode == WB_SYNC_ALL ? "ALL" : "HOLD"));
981
982 if (ceph_inode_is_shutdown(inode)) {
983 if (ci->i_wrbuffer_ref > 0) {
984 pr_warn_ratelimited_client(cl,
985 "%llx.%llx %lld forced umount\n",
986 ceph_vinop(inode), ceph_ino(inode));
987 }
988 mapping_set_error(mapping, -EIO);
989 return -EIO; /* we're in a forced umount, don't write! */
990 }
991 if (fsc->mount_options->wsize < wsize)
992 wsize = fsc->mount_options->wsize;
993
994 folio_batch_init(&fbatch);
995
996 start_index = wbc->range_cyclic ? mapping->writeback_index : 0;
997 index = start_index;
998
999 if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages) {
1000 tag = PAGECACHE_TAG_TOWRITE;
1001 } else {
1002 tag = PAGECACHE_TAG_DIRTY;
1003 }
1004 retry:
1005 /* find oldest snap context with dirty data */
1006 snapc = get_oldest_context(inode, &ceph_wbc, NULL);
1007 if (!snapc) {
1008 /* hmm, why does writepages get called when there
1009 is no dirty data? */
1010 doutc(cl, " no snap context with dirty data?\n");
1011 goto out;
1012 }
1013 doutc(cl, " oldest snapc is %p seq %lld (%d snaps)\n", snapc,
1014 snapc->seq, snapc->num_snaps);
1015
1016 should_loop = false;
1017 if (ceph_wbc.head_snapc && snapc != last_snapc) {
1018 /* where to start/end? */
1019 if (wbc->range_cyclic) {
1020 index = start_index;
1021 end = -1;
1022 if (index > 0)
1023 should_loop = true;
1024 doutc(cl, " cyclic, start at %lu\n", index);
1025 } else {
1026 index = wbc->range_start >> PAGE_SHIFT;
1027 end = wbc->range_end >> PAGE_SHIFT;
1028 if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
1029 range_whole = true;
1030 doutc(cl, " not cyclic, %lu to %lu\n", index, end);
1031 }
1032 } else if (!ceph_wbc.head_snapc) {
1033 /* Do not respect wbc->range_{start,end}. Dirty pages
1034 * in that range can be associated with newer snapc.
1035 * They are not writeable until we write all dirty pages
1036 * associated with 'snapc' get written */
1037 if (index > 0)
1038 should_loop = true;
1039 doutc(cl, " non-head snapc, range whole\n");
1040 }
1041
1042 if (wbc->sync_mode == WB_SYNC_ALL || wbc->tagged_writepages)
1043 tag_pages_for_writeback(mapping, index, end);
1044
1045 ceph_put_snap_context(last_snapc);
1046 last_snapc = snapc;
1047
1048 while (!done && index <= end) {
1049 int num_ops = 0, op_idx;
1050 unsigned i, nr_folios, max_pages, locked_pages = 0;
1051 struct page **pages = NULL, **data_pages;
1052 struct page *page;
1053 pgoff_t strip_unit_end = 0;
1054 u64 offset = 0, len = 0;
1055 bool from_pool = false;
1056
1057 max_pages = wsize >> PAGE_SHIFT;
1058
1059 get_more_pages:
1060 nr_folios = filemap_get_folios_tag(mapping, &index,
1061 end, tag, &fbatch);
1062 doutc(cl, "pagevec_lookup_range_tag got %d\n", nr_folios);
1063 if (!nr_folios && !locked_pages)
1064 break;
1065 for (i = 0; i < nr_folios && locked_pages < max_pages; i++) {
1066 page = &fbatch.folios[i]->page;
1067 doutc(cl, "? %p idx %lu\n", page, page->index);
1068 if (locked_pages == 0)
1069 lock_page(page); /* first page */
1070 else if (!trylock_page(page))
1071 break;
1072
1073 /* only dirty pages, or our accounting breaks */
1074 if (unlikely(!PageDirty(page)) ||
1075 unlikely(page->mapping != mapping)) {
1076 doutc(cl, "!dirty or !mapping %p\n", page);
1077 unlock_page(page);
1078 continue;
1079 }
1080 /* only if matching snap context */
1081 pgsnapc = page_snap_context(page);
1082 if (pgsnapc != snapc) {
1083 doutc(cl, "page snapc %p %lld != oldest %p %lld\n",
1084 pgsnapc, pgsnapc->seq, snapc, snapc->seq);
1085 if (!should_loop &&
1086 !ceph_wbc.head_snapc &&
1087 wbc->sync_mode != WB_SYNC_NONE)
1088 should_loop = true;
1089 unlock_page(page);
1090 continue;
1091 }
1092 if (page_offset(page) >= ceph_wbc.i_size) {
1093 struct folio *folio = page_folio(page);
1094
1095 doutc(cl, "folio at %lu beyond eof %llu\n",
1096 folio->index, ceph_wbc.i_size);
1097 if ((ceph_wbc.size_stable ||
1098 folio_pos(folio) >= i_size_read(inode)) &&
1099 folio_clear_dirty_for_io(folio))
1100 folio_invalidate(folio, 0,
1101 folio_size(folio));
1102 folio_unlock(folio);
1103 continue;
1104 }
1105 if (strip_unit_end && (page->index > strip_unit_end)) {
1106 doutc(cl, "end of strip unit %p\n", page);
1107 unlock_page(page);
1108 break;
1109 }
1110 if (PageWriteback(page) ||
1111 PagePrivate2(page) /* [DEPRECATED] */) {
1112 if (wbc->sync_mode == WB_SYNC_NONE) {
1113 doutc(cl, "%p under writeback\n", page);
1114 unlock_page(page);
1115 continue;
1116 }
1117 doutc(cl, "waiting on writeback %p\n", page);
1118 wait_on_page_writeback(page);
1119 folio_wait_private_2(page_folio(page)); /* [DEPRECATED] */
1120 }
1121
1122 if (!clear_page_dirty_for_io(page)) {
1123 doutc(cl, "%p !clear_page_dirty_for_io\n", page);
1124 unlock_page(page);
1125 continue;
1126 }
1127
1128 /*
1129 * We have something to write. If this is
1130 * the first locked page this time through,
1131 * calculate max possinle write size and
1132 * allocate a page array
1133 */
1134 if (locked_pages == 0) {
1135 u64 objnum;
1136 u64 objoff;
1137 u32 xlen;
1138
1139 /* prepare async write request */
1140 offset = (u64)page_offset(page);
1141 ceph_calc_file_object_mapping(&ci->i_layout,
1142 offset, wsize,
1143 &objnum, &objoff,
1144 &xlen);
1145 len = xlen;
1146
1147 num_ops = 1;
1148 strip_unit_end = page->index +
1149 ((len - 1) >> PAGE_SHIFT);
1150
1151 BUG_ON(pages);
1152 max_pages = calc_pages_for(0, (u64)len);
1153 pages = kmalloc_array(max_pages,
1154 sizeof(*pages),
1155 GFP_NOFS);
1156 if (!pages) {
1157 from_pool = true;
1158 pages = mempool_alloc(ceph_wb_pagevec_pool, GFP_NOFS);
1159 BUG_ON(!pages);
1160 }
1161
1162 len = 0;
1163 } else if (page->index !=
1164 (offset + len) >> PAGE_SHIFT) {
1165 if (num_ops >= (from_pool ? CEPH_OSD_SLAB_OPS :
1166 CEPH_OSD_MAX_OPS)) {
1167 redirty_page_for_writepage(wbc, page);
1168 unlock_page(page);
1169 break;
1170 }
1171
1172 num_ops++;
1173 offset = (u64)page_offset(page);
1174 len = 0;
1175 }
1176
1177 /* note position of first page in fbatch */
1178 doutc(cl, "%llx.%llx will write page %p idx %lu\n",
1179 ceph_vinop(inode), page, page->index);
1180
1181 if (atomic_long_inc_return(&fsc->writeback_count) >
1182 CONGESTION_ON_THRESH(
1183 fsc->mount_options->congestion_kb))
1184 fsc->write_congested = true;
1185
1186 if (IS_ENCRYPTED(inode)) {
1187 pages[locked_pages] =
1188 fscrypt_encrypt_pagecache_blocks(page,
1189 PAGE_SIZE, 0,
1190 locked_pages ? GFP_NOWAIT : GFP_NOFS);
1191 if (IS_ERR(pages[locked_pages])) {
1192 if (PTR_ERR(pages[locked_pages]) == -EINVAL)
1193 pr_err_client(cl,
1194 "inode->i_blkbits=%hhu\n",
1195 inode->i_blkbits);
1196 /* better not fail on first page! */
1197 BUG_ON(locked_pages == 0);
1198 pages[locked_pages] = NULL;
1199 redirty_page_for_writepage(wbc, page);
1200 unlock_page(page);
1201 break;
1202 }
1203 ++locked_pages;
1204 } else {
1205 pages[locked_pages++] = page;
1206 }
1207
1208 fbatch.folios[i] = NULL;
1209 len += thp_size(page);
1210 }
1211
1212 /* did we get anything? */
1213 if (!locked_pages)
1214 goto release_folios;
1215 if (i) {
1216 unsigned j, n = 0;
1217 /* shift unused page to beginning of fbatch */
1218 for (j = 0; j < nr_folios; j++) {
1219 if (!fbatch.folios[j])
1220 continue;
1221 if (n < j)
1222 fbatch.folios[n] = fbatch.folios[j];
1223 n++;
1224 }
1225 fbatch.nr = n;
1226
1227 if (nr_folios && i == nr_folios &&
1228 locked_pages < max_pages) {
1229 doutc(cl, "reached end fbatch, trying for more\n");
1230 folio_batch_release(&fbatch);
1231 goto get_more_pages;
1232 }
1233 }
1234
1235 new_request:
1236 offset = ceph_fscrypt_page_offset(pages[0]);
1237 len = wsize;
1238
1239 req = ceph_osdc_new_request(&fsc->client->osdc,
1240 &ci->i_layout, vino,
1241 offset, &len, 0, num_ops,
1242 CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE,
1243 snapc, ceph_wbc.truncate_seq,
1244 ceph_wbc.truncate_size, false);
1245 if (IS_ERR(req)) {
1246 req = ceph_osdc_new_request(&fsc->client->osdc,
1247 &ci->i_layout, vino,
1248 offset, &len, 0,
1249 min(num_ops,
1250 CEPH_OSD_SLAB_OPS),
1251 CEPH_OSD_OP_WRITE,
1252 CEPH_OSD_FLAG_WRITE,
1253 snapc, ceph_wbc.truncate_seq,
1254 ceph_wbc.truncate_size, true);
1255 BUG_ON(IS_ERR(req));
1256 }
1257 BUG_ON(len < ceph_fscrypt_page_offset(pages[locked_pages - 1]) +
1258 thp_size(pages[locked_pages - 1]) - offset);
1259
1260 if (!ceph_inc_osd_stopping_blocker(fsc->mdsc)) {
1261 rc = -EIO;
1262 goto release_folios;
1263 }
1264 req->r_callback = writepages_finish;
1265 req->r_inode = inode;
1266
1267 /* Format the osd request message and submit the write */
1268 len = 0;
1269 data_pages = pages;
1270 op_idx = 0;
1271 for (i = 0; i < locked_pages; i++) {
1272 struct page *page = ceph_fscrypt_pagecache_page(pages[i]);
1273
1274 u64 cur_offset = page_offset(page);
1275 /*
1276 * Discontinuity in page range? Ceph can handle that by just passing
1277 * multiple extents in the write op.
1278 */
1279 if (offset + len != cur_offset) {
1280 /* If it's full, stop here */
1281 if (op_idx + 1 == req->r_num_ops)
1282 break;
1283
1284 /* Kick off an fscache write with what we have so far. */
1285 ceph_fscache_write_to_cache(inode, offset, len, caching);
1286
1287 /* Start a new extent */
1288 osd_req_op_extent_dup_last(req, op_idx,
1289 cur_offset - offset);
1290 doutc(cl, "got pages at %llu~%llu\n", offset,
1291 len);
1292 osd_req_op_extent_osd_data_pages(req, op_idx,
1293 data_pages, len, 0,
1294 from_pool, false);
1295 osd_req_op_extent_update(req, op_idx, len);
1296
1297 len = 0;
1298 offset = cur_offset;
1299 data_pages = pages + i;
1300 op_idx++;
1301 }
1302
1303 set_page_writeback(page);
1304 if (caching)
1305 ceph_set_page_fscache(page);
1306 len += thp_size(page);
1307 }
1308 ceph_fscache_write_to_cache(inode, offset, len, caching);
1309
1310 if (ceph_wbc.size_stable) {
1311 len = min(len, ceph_wbc.i_size - offset);
1312 } else if (i == locked_pages) {
1313 /* writepages_finish() clears writeback pages
1314 * according to the data length, so make sure
1315 * data length covers all locked pages */
1316 u64 min_len = len + 1 - thp_size(page);
1317 len = get_writepages_data_length(inode, pages[i - 1],
1318 offset);
1319 len = max(len, min_len);
1320 }
1321 if (IS_ENCRYPTED(inode))
1322 len = round_up(len, CEPH_FSCRYPT_BLOCK_SIZE);
1323
1324 doutc(cl, "got pages at %llu~%llu\n", offset, len);
1325
1326 if (IS_ENCRYPTED(inode) &&
1327 ((offset | len) & ~CEPH_FSCRYPT_BLOCK_MASK))
1328 pr_warn_client(cl,
1329 "bad encrypted write offset=%lld len=%llu\n",
1330 offset, len);
1331
1332 osd_req_op_extent_osd_data_pages(req, op_idx, data_pages, len,
1333 0, from_pool, false);
1334 osd_req_op_extent_update(req, op_idx, len);
1335
1336 BUG_ON(op_idx + 1 != req->r_num_ops);
1337
1338 from_pool = false;
1339 if (i < locked_pages) {
1340 BUG_ON(num_ops <= req->r_num_ops);
1341 num_ops -= req->r_num_ops;
1342 locked_pages -= i;
1343
1344 /* allocate new pages array for next request */
1345 data_pages = pages;
1346 pages = kmalloc_array(locked_pages, sizeof(*pages),
1347 GFP_NOFS);
1348 if (!pages) {
1349 from_pool = true;
1350 pages = mempool_alloc(ceph_wb_pagevec_pool, GFP_NOFS);
1351 BUG_ON(!pages);
1352 }
1353 memcpy(pages, data_pages + i,
1354 locked_pages * sizeof(*pages));
1355 memset(data_pages + i, 0,
1356 locked_pages * sizeof(*pages));
1357 } else {
1358 BUG_ON(num_ops != req->r_num_ops);
1359 index = pages[i - 1]->index + 1;
1360 /* request message now owns the pages array */
1361 pages = NULL;
1362 }
1363
1364 req->r_mtime = inode_get_mtime(inode);
1365 ceph_osdc_start_request(&fsc->client->osdc, req);
1366 req = NULL;
1367
1368 wbc->nr_to_write -= i;
1369 if (pages)
1370 goto new_request;
1371
1372 /*
1373 * We stop writing back only if we are not doing
1374 * integrity sync. In case of integrity sync we have to
1375 * keep going until we have written all the pages
1376 * we tagged for writeback prior to entering this loop.
1377 */
1378 if (wbc->nr_to_write <= 0 && wbc->sync_mode == WB_SYNC_NONE)
1379 done = true;
1380
1381 release_folios:
1382 doutc(cl, "folio_batch release on %d folios (%p)\n",
1383 (int)fbatch.nr, fbatch.nr ? fbatch.folios[0] : NULL);
1384 folio_batch_release(&fbatch);
1385 }
1386
1387 if (should_loop && !done) {
1388 /* more to do; loop back to beginning of file */
1389 doutc(cl, "looping back to beginning of file\n");
1390 end = start_index - 1; /* OK even when start_index == 0 */
1391
1392 /* to write dirty pages associated with next snapc,
1393 * we need to wait until current writes complete */
1394 if (wbc->sync_mode != WB_SYNC_NONE &&
1395 start_index == 0 && /* all dirty pages were checked */
1396 !ceph_wbc.head_snapc) {
1397 struct page *page;
1398 unsigned i, nr;
1399 index = 0;
1400 while ((index <= end) &&
1401 (nr = filemap_get_folios_tag(mapping, &index,
1402 (pgoff_t)-1,
1403 PAGECACHE_TAG_WRITEBACK,
1404 &fbatch))) {
1405 for (i = 0; i < nr; i++) {
1406 page = &fbatch.folios[i]->page;
1407 if (page_snap_context(page) != snapc)
1408 continue;
1409 wait_on_page_writeback(page);
1410 }
1411 folio_batch_release(&fbatch);
1412 cond_resched();
1413 }
1414 }
1415
1416 start_index = 0;
1417 index = 0;
1418 goto retry;
1419 }
1420
1421 if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
1422 mapping->writeback_index = index;
1423
1424 out:
1425 ceph_osdc_put_request(req);
1426 ceph_put_snap_context(last_snapc);
1427 doutc(cl, "%llx.%llx dend - startone, rc = %d\n", ceph_vinop(inode),
1428 rc);
1429 return rc;
1430 }
1431
1432
1433
1434 /*
1435 * See if a given @snapc is either writeable, or already written.
1436 */
context_is_writeable_or_written(struct inode * inode,struct ceph_snap_context * snapc)1437 static int context_is_writeable_or_written(struct inode *inode,
1438 struct ceph_snap_context *snapc)
1439 {
1440 struct ceph_snap_context *oldest = get_oldest_context(inode, NULL, NULL);
1441 int ret = !oldest || snapc->seq <= oldest->seq;
1442
1443 ceph_put_snap_context(oldest);
1444 return ret;
1445 }
1446
1447 /**
1448 * ceph_find_incompatible - find an incompatible context and return it
1449 * @page: page being dirtied
1450 *
1451 * We are only allowed to write into/dirty a page if the page is
1452 * clean, or already dirty within the same snap context. Returns a
1453 * conflicting context if there is one, NULL if there isn't, or a
1454 * negative error code on other errors.
1455 *
1456 * Must be called with page lock held.
1457 */
1458 static struct ceph_snap_context *
ceph_find_incompatible(struct page * page)1459 ceph_find_incompatible(struct page *page)
1460 {
1461 struct inode *inode = page->mapping->host;
1462 struct ceph_client *cl = ceph_inode_to_client(inode);
1463 struct ceph_inode_info *ci = ceph_inode(inode);
1464
1465 if (ceph_inode_is_shutdown(inode)) {
1466 doutc(cl, " %llx.%llx page %p is shutdown\n",
1467 ceph_vinop(inode), page);
1468 return ERR_PTR(-ESTALE);
1469 }
1470
1471 for (;;) {
1472 struct ceph_snap_context *snapc, *oldest;
1473
1474 wait_on_page_writeback(page);
1475
1476 snapc = page_snap_context(page);
1477 if (!snapc || snapc == ci->i_head_snapc)
1478 break;
1479
1480 /*
1481 * this page is already dirty in another (older) snap
1482 * context! is it writeable now?
1483 */
1484 oldest = get_oldest_context(inode, NULL, NULL);
1485 if (snapc->seq > oldest->seq) {
1486 /* not writeable -- return it for the caller to deal with */
1487 ceph_put_snap_context(oldest);
1488 doutc(cl, " %llx.%llx page %p snapc %p not current or oldest\n",
1489 ceph_vinop(inode), page, snapc);
1490 return ceph_get_snap_context(snapc);
1491 }
1492 ceph_put_snap_context(oldest);
1493
1494 /* yay, writeable, do it now (without dropping page lock) */
1495 doutc(cl, " %llx.%llx page %p snapc %p not current, but oldest\n",
1496 ceph_vinop(inode), page, snapc);
1497 if (clear_page_dirty_for_io(page)) {
1498 int r = writepage_nounlock(page, NULL);
1499 if (r < 0)
1500 return ERR_PTR(r);
1501 }
1502 }
1503 return NULL;
1504 }
1505
ceph_netfs_check_write_begin(struct file * file,loff_t pos,unsigned int len,struct folio ** foliop,void ** _fsdata)1506 static int ceph_netfs_check_write_begin(struct file *file, loff_t pos, unsigned int len,
1507 struct folio **foliop, void **_fsdata)
1508 {
1509 struct inode *inode = file_inode(file);
1510 struct ceph_inode_info *ci = ceph_inode(inode);
1511 struct ceph_snap_context *snapc;
1512
1513 snapc = ceph_find_incompatible(folio_page(*foliop, 0));
1514 if (snapc) {
1515 int r;
1516
1517 folio_unlock(*foliop);
1518 folio_put(*foliop);
1519 *foliop = NULL;
1520 if (IS_ERR(snapc))
1521 return PTR_ERR(snapc);
1522
1523 ceph_queue_writeback(inode);
1524 r = wait_event_killable(ci->i_cap_wq,
1525 context_is_writeable_or_written(inode, snapc));
1526 ceph_put_snap_context(snapc);
1527 return r == 0 ? -EAGAIN : r;
1528 }
1529 return 0;
1530 }
1531
1532 /*
1533 * We are only allowed to write into/dirty the page if the page is
1534 * clean, or already dirty within the same snap context.
1535 */
ceph_write_begin(struct file * file,struct address_space * mapping,loff_t pos,unsigned len,struct folio ** foliop,void ** fsdata)1536 static int ceph_write_begin(struct file *file, struct address_space *mapping,
1537 loff_t pos, unsigned len,
1538 struct folio **foliop, void **fsdata)
1539 {
1540 struct inode *inode = file_inode(file);
1541 struct ceph_inode_info *ci = ceph_inode(inode);
1542 int r;
1543
1544 r = netfs_write_begin(&ci->netfs, file, inode->i_mapping, pos, len, foliop, NULL);
1545 if (r < 0)
1546 return r;
1547
1548 folio_wait_private_2(*foliop); /* [DEPRECATED] */
1549 WARN_ON_ONCE(!folio_test_locked(*foliop));
1550 return 0;
1551 }
1552
1553 /*
1554 * we don't do anything in here that simple_write_end doesn't do
1555 * except adjust dirty page accounting
1556 */
ceph_write_end(struct file * file,struct address_space * mapping,loff_t pos,unsigned len,unsigned copied,struct folio * folio,void * fsdata)1557 static int ceph_write_end(struct file *file, struct address_space *mapping,
1558 loff_t pos, unsigned len, unsigned copied,
1559 struct folio *folio, void *fsdata)
1560 {
1561 struct inode *inode = file_inode(file);
1562 struct ceph_client *cl = ceph_inode_to_client(inode);
1563 bool check_cap = false;
1564
1565 doutc(cl, "%llx.%llx file %p folio %p %d~%d (%d)\n", ceph_vinop(inode),
1566 file, folio, (int)pos, (int)copied, (int)len);
1567
1568 if (!folio_test_uptodate(folio)) {
1569 /* just return that nothing was copied on a short copy */
1570 if (copied < len) {
1571 copied = 0;
1572 goto out;
1573 }
1574 folio_mark_uptodate(folio);
1575 }
1576
1577 /* did file size increase? */
1578 if (pos+copied > i_size_read(inode))
1579 check_cap = ceph_inode_set_size(inode, pos+copied);
1580
1581 folio_mark_dirty(folio);
1582
1583 out:
1584 folio_unlock(folio);
1585 folio_put(folio);
1586
1587 if (check_cap)
1588 ceph_check_caps(ceph_inode(inode), CHECK_CAPS_AUTHONLY);
1589
1590 return copied;
1591 }
1592
1593 const struct address_space_operations ceph_aops = {
1594 .read_folio = netfs_read_folio,
1595 .readahead = netfs_readahead,
1596 .writepage = ceph_writepage,
1597 .writepages = ceph_writepages_start,
1598 .write_begin = ceph_write_begin,
1599 .write_end = ceph_write_end,
1600 .dirty_folio = ceph_dirty_folio,
1601 .invalidate_folio = ceph_invalidate_folio,
1602 .release_folio = netfs_release_folio,
1603 .direct_IO = noop_direct_IO,
1604 };
1605
ceph_block_sigs(sigset_t * oldset)1606 static void ceph_block_sigs(sigset_t *oldset)
1607 {
1608 sigset_t mask;
1609 siginitsetinv(&mask, sigmask(SIGKILL));
1610 sigprocmask(SIG_BLOCK, &mask, oldset);
1611 }
1612
ceph_restore_sigs(sigset_t * oldset)1613 static void ceph_restore_sigs(sigset_t *oldset)
1614 {
1615 sigprocmask(SIG_SETMASK, oldset, NULL);
1616 }
1617
1618 /*
1619 * vm ops
1620 */
ceph_filemap_fault(struct vm_fault * vmf)1621 static vm_fault_t ceph_filemap_fault(struct vm_fault *vmf)
1622 {
1623 struct vm_area_struct *vma = vmf->vma;
1624 struct inode *inode = file_inode(vma->vm_file);
1625 struct ceph_inode_info *ci = ceph_inode(inode);
1626 struct ceph_client *cl = ceph_inode_to_client(inode);
1627 struct ceph_file_info *fi = vma->vm_file->private_data;
1628 loff_t off = (loff_t)vmf->pgoff << PAGE_SHIFT;
1629 int want, got, err;
1630 sigset_t oldset;
1631 vm_fault_t ret = VM_FAULT_SIGBUS;
1632
1633 if (ceph_inode_is_shutdown(inode))
1634 return ret;
1635
1636 ceph_block_sigs(&oldset);
1637
1638 doutc(cl, "%llx.%llx %llu trying to get caps\n",
1639 ceph_vinop(inode), off);
1640 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1641 want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
1642 else
1643 want = CEPH_CAP_FILE_CACHE;
1644
1645 got = 0;
1646 err = ceph_get_caps(vma->vm_file, CEPH_CAP_FILE_RD, want, -1, &got);
1647 if (err < 0)
1648 goto out_restore;
1649
1650 doutc(cl, "%llx.%llx %llu got cap refs on %s\n", ceph_vinop(inode),
1651 off, ceph_cap_string(got));
1652
1653 if ((got & (CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO)) ||
1654 !ceph_has_inline_data(ci)) {
1655 CEPH_DEFINE_RW_CONTEXT(rw_ctx, got);
1656 ceph_add_rw_context(fi, &rw_ctx);
1657 ret = filemap_fault(vmf);
1658 ceph_del_rw_context(fi, &rw_ctx);
1659 doutc(cl, "%llx.%llx %llu drop cap refs %s ret %x\n",
1660 ceph_vinop(inode), off, ceph_cap_string(got), ret);
1661 } else
1662 err = -EAGAIN;
1663
1664 ceph_put_cap_refs(ci, got);
1665
1666 if (err != -EAGAIN)
1667 goto out_restore;
1668
1669 /* read inline data */
1670 if (off >= PAGE_SIZE) {
1671 /* does not support inline data > PAGE_SIZE */
1672 ret = VM_FAULT_SIGBUS;
1673 } else {
1674 struct address_space *mapping = inode->i_mapping;
1675 struct page *page;
1676
1677 filemap_invalidate_lock_shared(mapping);
1678 page = find_or_create_page(mapping, 0,
1679 mapping_gfp_constraint(mapping, ~__GFP_FS));
1680 if (!page) {
1681 ret = VM_FAULT_OOM;
1682 goto out_inline;
1683 }
1684 err = __ceph_do_getattr(inode, page,
1685 CEPH_STAT_CAP_INLINE_DATA, true);
1686 if (err < 0 || off >= i_size_read(inode)) {
1687 unlock_page(page);
1688 put_page(page);
1689 ret = vmf_error(err);
1690 goto out_inline;
1691 }
1692 if (err < PAGE_SIZE)
1693 zero_user_segment(page, err, PAGE_SIZE);
1694 else
1695 flush_dcache_page(page);
1696 SetPageUptodate(page);
1697 vmf->page = page;
1698 ret = VM_FAULT_MAJOR | VM_FAULT_LOCKED;
1699 out_inline:
1700 filemap_invalidate_unlock_shared(mapping);
1701 doutc(cl, "%llx.%llx %llu read inline data ret %x\n",
1702 ceph_vinop(inode), off, ret);
1703 }
1704 out_restore:
1705 ceph_restore_sigs(&oldset);
1706 if (err < 0)
1707 ret = vmf_error(err);
1708
1709 return ret;
1710 }
1711
ceph_page_mkwrite(struct vm_fault * vmf)1712 static vm_fault_t ceph_page_mkwrite(struct vm_fault *vmf)
1713 {
1714 struct vm_area_struct *vma = vmf->vma;
1715 struct inode *inode = file_inode(vma->vm_file);
1716 struct ceph_client *cl = ceph_inode_to_client(inode);
1717 struct ceph_inode_info *ci = ceph_inode(inode);
1718 struct ceph_file_info *fi = vma->vm_file->private_data;
1719 struct ceph_cap_flush *prealloc_cf;
1720 struct page *page = vmf->page;
1721 loff_t off = page_offset(page);
1722 loff_t size = i_size_read(inode);
1723 size_t len;
1724 int want, got, err;
1725 sigset_t oldset;
1726 vm_fault_t ret = VM_FAULT_SIGBUS;
1727
1728 if (ceph_inode_is_shutdown(inode))
1729 return ret;
1730
1731 prealloc_cf = ceph_alloc_cap_flush();
1732 if (!prealloc_cf)
1733 return VM_FAULT_OOM;
1734
1735 sb_start_pagefault(inode->i_sb);
1736 ceph_block_sigs(&oldset);
1737
1738 if (off + thp_size(page) <= size)
1739 len = thp_size(page);
1740 else
1741 len = offset_in_thp(page, size);
1742
1743 doutc(cl, "%llx.%llx %llu~%zd getting caps i_size %llu\n",
1744 ceph_vinop(inode), off, len, size);
1745 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1746 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
1747 else
1748 want = CEPH_CAP_FILE_BUFFER;
1749
1750 got = 0;
1751 err = ceph_get_caps(vma->vm_file, CEPH_CAP_FILE_WR, want, off + len, &got);
1752 if (err < 0)
1753 goto out_free;
1754
1755 doutc(cl, "%llx.%llx %llu~%zd got cap refs on %s\n", ceph_vinop(inode),
1756 off, len, ceph_cap_string(got));
1757
1758 /* Update time before taking page lock */
1759 file_update_time(vma->vm_file);
1760 inode_inc_iversion_raw(inode);
1761
1762 do {
1763 struct ceph_snap_context *snapc;
1764
1765 lock_page(page);
1766
1767 if (page_mkwrite_check_truncate(page, inode) < 0) {
1768 unlock_page(page);
1769 ret = VM_FAULT_NOPAGE;
1770 break;
1771 }
1772
1773 snapc = ceph_find_incompatible(page);
1774 if (!snapc) {
1775 /* success. we'll keep the page locked. */
1776 set_page_dirty(page);
1777 ret = VM_FAULT_LOCKED;
1778 break;
1779 }
1780
1781 unlock_page(page);
1782
1783 if (IS_ERR(snapc)) {
1784 ret = VM_FAULT_SIGBUS;
1785 break;
1786 }
1787
1788 ceph_queue_writeback(inode);
1789 err = wait_event_killable(ci->i_cap_wq,
1790 context_is_writeable_or_written(inode, snapc));
1791 ceph_put_snap_context(snapc);
1792 } while (err == 0);
1793
1794 if (ret == VM_FAULT_LOCKED) {
1795 int dirty;
1796 spin_lock(&ci->i_ceph_lock);
1797 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
1798 &prealloc_cf);
1799 spin_unlock(&ci->i_ceph_lock);
1800 if (dirty)
1801 __mark_inode_dirty(inode, dirty);
1802 }
1803
1804 doutc(cl, "%llx.%llx %llu~%zd dropping cap refs on %s ret %x\n",
1805 ceph_vinop(inode), off, len, ceph_cap_string(got), ret);
1806 ceph_put_cap_refs_async(ci, got);
1807 out_free:
1808 ceph_restore_sigs(&oldset);
1809 sb_end_pagefault(inode->i_sb);
1810 ceph_free_cap_flush(prealloc_cf);
1811 if (err < 0)
1812 ret = vmf_error(err);
1813 return ret;
1814 }
1815
ceph_fill_inline_data(struct inode * inode,struct page * locked_page,char * data,size_t len)1816 void ceph_fill_inline_data(struct inode *inode, struct page *locked_page,
1817 char *data, size_t len)
1818 {
1819 struct ceph_client *cl = ceph_inode_to_client(inode);
1820 struct address_space *mapping = inode->i_mapping;
1821 struct page *page;
1822
1823 if (locked_page) {
1824 page = locked_page;
1825 } else {
1826 if (i_size_read(inode) == 0)
1827 return;
1828 page = find_or_create_page(mapping, 0,
1829 mapping_gfp_constraint(mapping,
1830 ~__GFP_FS));
1831 if (!page)
1832 return;
1833 if (PageUptodate(page)) {
1834 unlock_page(page);
1835 put_page(page);
1836 return;
1837 }
1838 }
1839
1840 doutc(cl, "%p %llx.%llx len %zu locked_page %p\n", inode,
1841 ceph_vinop(inode), len, locked_page);
1842
1843 if (len > 0) {
1844 void *kaddr = kmap_atomic(page);
1845 memcpy(kaddr, data, len);
1846 kunmap_atomic(kaddr);
1847 }
1848
1849 if (page != locked_page) {
1850 if (len < PAGE_SIZE)
1851 zero_user_segment(page, len, PAGE_SIZE);
1852 else
1853 flush_dcache_page(page);
1854
1855 SetPageUptodate(page);
1856 unlock_page(page);
1857 put_page(page);
1858 }
1859 }
1860
ceph_uninline_data(struct file * file)1861 int ceph_uninline_data(struct file *file)
1862 {
1863 struct inode *inode = file_inode(file);
1864 struct ceph_inode_info *ci = ceph_inode(inode);
1865 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
1866 struct ceph_client *cl = fsc->client;
1867 struct ceph_osd_request *req = NULL;
1868 struct ceph_cap_flush *prealloc_cf = NULL;
1869 struct folio *folio = NULL;
1870 u64 inline_version = CEPH_INLINE_NONE;
1871 struct page *pages[1];
1872 int err = 0;
1873 u64 len;
1874
1875 spin_lock(&ci->i_ceph_lock);
1876 inline_version = ci->i_inline_version;
1877 spin_unlock(&ci->i_ceph_lock);
1878
1879 doutc(cl, "%llx.%llx inline_version %llu\n", ceph_vinop(inode),
1880 inline_version);
1881
1882 if (ceph_inode_is_shutdown(inode)) {
1883 err = -EIO;
1884 goto out;
1885 }
1886
1887 if (inline_version == CEPH_INLINE_NONE)
1888 return 0;
1889
1890 prealloc_cf = ceph_alloc_cap_flush();
1891 if (!prealloc_cf)
1892 return -ENOMEM;
1893
1894 if (inline_version == 1) /* initial version, no data */
1895 goto out_uninline;
1896
1897 folio = read_mapping_folio(inode->i_mapping, 0, file);
1898 if (IS_ERR(folio)) {
1899 err = PTR_ERR(folio);
1900 goto out;
1901 }
1902
1903 folio_lock(folio);
1904
1905 len = i_size_read(inode);
1906 if (len > folio_size(folio))
1907 len = folio_size(folio);
1908
1909 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1910 ceph_vino(inode), 0, &len, 0, 1,
1911 CEPH_OSD_OP_CREATE, CEPH_OSD_FLAG_WRITE,
1912 NULL, 0, 0, false);
1913 if (IS_ERR(req)) {
1914 err = PTR_ERR(req);
1915 goto out_unlock;
1916 }
1917
1918 req->r_mtime = inode_get_mtime(inode);
1919 ceph_osdc_start_request(&fsc->client->osdc, req);
1920 err = ceph_osdc_wait_request(&fsc->client->osdc, req);
1921 ceph_osdc_put_request(req);
1922 if (err < 0)
1923 goto out_unlock;
1924
1925 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1926 ceph_vino(inode), 0, &len, 1, 3,
1927 CEPH_OSD_OP_WRITE, CEPH_OSD_FLAG_WRITE,
1928 NULL, ci->i_truncate_seq,
1929 ci->i_truncate_size, false);
1930 if (IS_ERR(req)) {
1931 err = PTR_ERR(req);
1932 goto out_unlock;
1933 }
1934
1935 pages[0] = folio_page(folio, 0);
1936 osd_req_op_extent_osd_data_pages(req, 1, pages, len, 0, false, false);
1937
1938 {
1939 __le64 xattr_buf = cpu_to_le64(inline_version);
1940 err = osd_req_op_xattr_init(req, 0, CEPH_OSD_OP_CMPXATTR,
1941 "inline_version", &xattr_buf,
1942 sizeof(xattr_buf),
1943 CEPH_OSD_CMPXATTR_OP_GT,
1944 CEPH_OSD_CMPXATTR_MODE_U64);
1945 if (err)
1946 goto out_put_req;
1947 }
1948
1949 {
1950 char xattr_buf[32];
1951 int xattr_len = snprintf(xattr_buf, sizeof(xattr_buf),
1952 "%llu", inline_version);
1953 err = osd_req_op_xattr_init(req, 2, CEPH_OSD_OP_SETXATTR,
1954 "inline_version",
1955 xattr_buf, xattr_len, 0, 0);
1956 if (err)
1957 goto out_put_req;
1958 }
1959
1960 req->r_mtime = inode_get_mtime(inode);
1961 ceph_osdc_start_request(&fsc->client->osdc, req);
1962 err = ceph_osdc_wait_request(&fsc->client->osdc, req);
1963
1964 ceph_update_write_metrics(&fsc->mdsc->metric, req->r_start_latency,
1965 req->r_end_latency, len, err);
1966
1967 out_uninline:
1968 if (!err) {
1969 int dirty;
1970
1971 /* Set to CAP_INLINE_NONE and dirty the caps */
1972 down_read(&fsc->mdsc->snap_rwsem);
1973 spin_lock(&ci->i_ceph_lock);
1974 ci->i_inline_version = CEPH_INLINE_NONE;
1975 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR, &prealloc_cf);
1976 spin_unlock(&ci->i_ceph_lock);
1977 up_read(&fsc->mdsc->snap_rwsem);
1978 if (dirty)
1979 __mark_inode_dirty(inode, dirty);
1980 }
1981 out_put_req:
1982 ceph_osdc_put_request(req);
1983 if (err == -ECANCELED)
1984 err = 0;
1985 out_unlock:
1986 if (folio) {
1987 folio_unlock(folio);
1988 folio_put(folio);
1989 }
1990 out:
1991 ceph_free_cap_flush(prealloc_cf);
1992 doutc(cl, "%llx.%llx inline_version %llu = %d\n",
1993 ceph_vinop(inode), inline_version, err);
1994 return err;
1995 }
1996
1997 static const struct vm_operations_struct ceph_vmops = {
1998 .fault = ceph_filemap_fault,
1999 .page_mkwrite = ceph_page_mkwrite,
2000 };
2001
ceph_mmap(struct file * file,struct vm_area_struct * vma)2002 int ceph_mmap(struct file *file, struct vm_area_struct *vma)
2003 {
2004 struct address_space *mapping = file->f_mapping;
2005
2006 if (!mapping->a_ops->read_folio)
2007 return -ENOEXEC;
2008 vma->vm_ops = &ceph_vmops;
2009 return 0;
2010 }
2011
2012 enum {
2013 POOL_READ = 1,
2014 POOL_WRITE = 2,
2015 };
2016
__ceph_pool_perm_get(struct ceph_inode_info * ci,s64 pool,struct ceph_string * pool_ns)2017 static int __ceph_pool_perm_get(struct ceph_inode_info *ci,
2018 s64 pool, struct ceph_string *pool_ns)
2019 {
2020 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(&ci->netfs.inode);
2021 struct ceph_mds_client *mdsc = fsc->mdsc;
2022 struct ceph_client *cl = fsc->client;
2023 struct ceph_osd_request *rd_req = NULL, *wr_req = NULL;
2024 struct rb_node **p, *parent;
2025 struct ceph_pool_perm *perm;
2026 struct page **pages;
2027 size_t pool_ns_len;
2028 int err = 0, err2 = 0, have = 0;
2029
2030 down_read(&mdsc->pool_perm_rwsem);
2031 p = &mdsc->pool_perm_tree.rb_node;
2032 while (*p) {
2033 perm = rb_entry(*p, struct ceph_pool_perm, node);
2034 if (pool < perm->pool)
2035 p = &(*p)->rb_left;
2036 else if (pool > perm->pool)
2037 p = &(*p)->rb_right;
2038 else {
2039 int ret = ceph_compare_string(pool_ns,
2040 perm->pool_ns,
2041 perm->pool_ns_len);
2042 if (ret < 0)
2043 p = &(*p)->rb_left;
2044 else if (ret > 0)
2045 p = &(*p)->rb_right;
2046 else {
2047 have = perm->perm;
2048 break;
2049 }
2050 }
2051 }
2052 up_read(&mdsc->pool_perm_rwsem);
2053 if (*p)
2054 goto out;
2055
2056 if (pool_ns)
2057 doutc(cl, "pool %lld ns %.*s no perm cached\n", pool,
2058 (int)pool_ns->len, pool_ns->str);
2059 else
2060 doutc(cl, "pool %lld no perm cached\n", pool);
2061
2062 down_write(&mdsc->pool_perm_rwsem);
2063 p = &mdsc->pool_perm_tree.rb_node;
2064 parent = NULL;
2065 while (*p) {
2066 parent = *p;
2067 perm = rb_entry(parent, struct ceph_pool_perm, node);
2068 if (pool < perm->pool)
2069 p = &(*p)->rb_left;
2070 else if (pool > perm->pool)
2071 p = &(*p)->rb_right;
2072 else {
2073 int ret = ceph_compare_string(pool_ns,
2074 perm->pool_ns,
2075 perm->pool_ns_len);
2076 if (ret < 0)
2077 p = &(*p)->rb_left;
2078 else if (ret > 0)
2079 p = &(*p)->rb_right;
2080 else {
2081 have = perm->perm;
2082 break;
2083 }
2084 }
2085 }
2086 if (*p) {
2087 up_write(&mdsc->pool_perm_rwsem);
2088 goto out;
2089 }
2090
2091 rd_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL,
2092 1, false, GFP_NOFS);
2093 if (!rd_req) {
2094 err = -ENOMEM;
2095 goto out_unlock;
2096 }
2097
2098 rd_req->r_flags = CEPH_OSD_FLAG_READ;
2099 osd_req_op_init(rd_req, 0, CEPH_OSD_OP_STAT, 0);
2100 rd_req->r_base_oloc.pool = pool;
2101 if (pool_ns)
2102 rd_req->r_base_oloc.pool_ns = ceph_get_string(pool_ns);
2103 ceph_oid_printf(&rd_req->r_base_oid, "%llx.00000000", ci->i_vino.ino);
2104
2105 err = ceph_osdc_alloc_messages(rd_req, GFP_NOFS);
2106 if (err)
2107 goto out_unlock;
2108
2109 wr_req = ceph_osdc_alloc_request(&fsc->client->osdc, NULL,
2110 1, false, GFP_NOFS);
2111 if (!wr_req) {
2112 err = -ENOMEM;
2113 goto out_unlock;
2114 }
2115
2116 wr_req->r_flags = CEPH_OSD_FLAG_WRITE;
2117 osd_req_op_init(wr_req, 0, CEPH_OSD_OP_CREATE, CEPH_OSD_OP_FLAG_EXCL);
2118 ceph_oloc_copy(&wr_req->r_base_oloc, &rd_req->r_base_oloc);
2119 ceph_oid_copy(&wr_req->r_base_oid, &rd_req->r_base_oid);
2120
2121 err = ceph_osdc_alloc_messages(wr_req, GFP_NOFS);
2122 if (err)
2123 goto out_unlock;
2124
2125 /* one page should be large enough for STAT data */
2126 pages = ceph_alloc_page_vector(1, GFP_KERNEL);
2127 if (IS_ERR(pages)) {
2128 err = PTR_ERR(pages);
2129 goto out_unlock;
2130 }
2131
2132 osd_req_op_raw_data_in_pages(rd_req, 0, pages, PAGE_SIZE,
2133 0, false, true);
2134 ceph_osdc_start_request(&fsc->client->osdc, rd_req);
2135
2136 wr_req->r_mtime = inode_get_mtime(&ci->netfs.inode);
2137 ceph_osdc_start_request(&fsc->client->osdc, wr_req);
2138
2139 err = ceph_osdc_wait_request(&fsc->client->osdc, rd_req);
2140 err2 = ceph_osdc_wait_request(&fsc->client->osdc, wr_req);
2141
2142 if (err >= 0 || err == -ENOENT)
2143 have |= POOL_READ;
2144 else if (err != -EPERM) {
2145 if (err == -EBLOCKLISTED)
2146 fsc->blocklisted = true;
2147 goto out_unlock;
2148 }
2149
2150 if (err2 == 0 || err2 == -EEXIST)
2151 have |= POOL_WRITE;
2152 else if (err2 != -EPERM) {
2153 if (err2 == -EBLOCKLISTED)
2154 fsc->blocklisted = true;
2155 err = err2;
2156 goto out_unlock;
2157 }
2158
2159 pool_ns_len = pool_ns ? pool_ns->len : 0;
2160 perm = kmalloc(struct_size(perm, pool_ns, pool_ns_len + 1), GFP_NOFS);
2161 if (!perm) {
2162 err = -ENOMEM;
2163 goto out_unlock;
2164 }
2165
2166 perm->pool = pool;
2167 perm->perm = have;
2168 perm->pool_ns_len = pool_ns_len;
2169 if (pool_ns_len > 0)
2170 memcpy(perm->pool_ns, pool_ns->str, pool_ns_len);
2171 perm->pool_ns[pool_ns_len] = 0;
2172
2173 rb_link_node(&perm->node, parent, p);
2174 rb_insert_color(&perm->node, &mdsc->pool_perm_tree);
2175 err = 0;
2176 out_unlock:
2177 up_write(&mdsc->pool_perm_rwsem);
2178
2179 ceph_osdc_put_request(rd_req);
2180 ceph_osdc_put_request(wr_req);
2181 out:
2182 if (!err)
2183 err = have;
2184 if (pool_ns)
2185 doutc(cl, "pool %lld ns %.*s result = %d\n", pool,
2186 (int)pool_ns->len, pool_ns->str, err);
2187 else
2188 doutc(cl, "pool %lld result = %d\n", pool, err);
2189 return err;
2190 }
2191
ceph_pool_perm_check(struct inode * inode,int need)2192 int ceph_pool_perm_check(struct inode *inode, int need)
2193 {
2194 struct ceph_client *cl = ceph_inode_to_client(inode);
2195 struct ceph_inode_info *ci = ceph_inode(inode);
2196 struct ceph_string *pool_ns;
2197 s64 pool;
2198 int ret, flags;
2199
2200 /* Only need to do this for regular files */
2201 if (!S_ISREG(inode->i_mode))
2202 return 0;
2203
2204 if (ci->i_vino.snap != CEPH_NOSNAP) {
2205 /*
2206 * Pool permission check needs to write to the first object.
2207 * But for snapshot, head of the first object may have alread
2208 * been deleted. Skip check to avoid creating orphan object.
2209 */
2210 return 0;
2211 }
2212
2213 if (ceph_test_mount_opt(ceph_inode_to_fs_client(inode),
2214 NOPOOLPERM))
2215 return 0;
2216
2217 spin_lock(&ci->i_ceph_lock);
2218 flags = ci->i_ceph_flags;
2219 pool = ci->i_layout.pool_id;
2220 spin_unlock(&ci->i_ceph_lock);
2221 check:
2222 if (flags & CEPH_I_POOL_PERM) {
2223 if ((need & CEPH_CAP_FILE_RD) && !(flags & CEPH_I_POOL_RD)) {
2224 doutc(cl, "pool %lld no read perm\n", pool);
2225 return -EPERM;
2226 }
2227 if ((need & CEPH_CAP_FILE_WR) && !(flags & CEPH_I_POOL_WR)) {
2228 doutc(cl, "pool %lld no write perm\n", pool);
2229 return -EPERM;
2230 }
2231 return 0;
2232 }
2233
2234 pool_ns = ceph_try_get_string(ci->i_layout.pool_ns);
2235 ret = __ceph_pool_perm_get(ci, pool, pool_ns);
2236 ceph_put_string(pool_ns);
2237 if (ret < 0)
2238 return ret;
2239
2240 flags = CEPH_I_POOL_PERM;
2241 if (ret & POOL_READ)
2242 flags |= CEPH_I_POOL_RD;
2243 if (ret & POOL_WRITE)
2244 flags |= CEPH_I_POOL_WR;
2245
2246 spin_lock(&ci->i_ceph_lock);
2247 if (pool == ci->i_layout.pool_id &&
2248 pool_ns == rcu_dereference_raw(ci->i_layout.pool_ns)) {
2249 ci->i_ceph_flags |= flags;
2250 } else {
2251 pool = ci->i_layout.pool_id;
2252 flags = ci->i_ceph_flags;
2253 }
2254 spin_unlock(&ci->i_ceph_lock);
2255 goto check;
2256 }
2257
ceph_pool_perm_destroy(struct ceph_mds_client * mdsc)2258 void ceph_pool_perm_destroy(struct ceph_mds_client *mdsc)
2259 {
2260 struct ceph_pool_perm *perm;
2261 struct rb_node *n;
2262
2263 while (!RB_EMPTY_ROOT(&mdsc->pool_perm_tree)) {
2264 n = rb_first(&mdsc->pool_perm_tree);
2265 perm = rb_entry(n, struct ceph_pool_perm, node);
2266 rb_erase(n, &mdsc->pool_perm_tree);
2267 kfree(perm);
2268 }
2269 }
2270