1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/ceph/ceph_debug.h>
3 #include <linux/ceph/striper.h>
4
5 #include <linux/module.h>
6 #include <linux/sched.h>
7 #include <linux/slab.h>
8 #include <linux/file.h>
9 #include <linux/mount.h>
10 #include <linux/namei.h>
11 #include <linux/writeback.h>
12 #include <linux/falloc.h>
13 #include <linux/iversion.h>
14 #include <linux/ktime.h>
15 #include <linux/splice.h>
16
17 #include "super.h"
18 #include "mds_client.h"
19 #include "cache.h"
20 #include "io.h"
21 #include "metric.h"
22
ceph_flags_sys2wire(struct ceph_mds_client * mdsc,u32 flags)23 static __le32 ceph_flags_sys2wire(struct ceph_mds_client *mdsc, u32 flags)
24 {
25 struct ceph_client *cl = mdsc->fsc->client;
26 u32 wire_flags = 0;
27
28 switch (flags & O_ACCMODE) {
29 case O_RDONLY:
30 wire_flags |= CEPH_O_RDONLY;
31 break;
32 case O_WRONLY:
33 wire_flags |= CEPH_O_WRONLY;
34 break;
35 case O_RDWR:
36 wire_flags |= CEPH_O_RDWR;
37 break;
38 }
39
40 flags &= ~O_ACCMODE;
41
42 #define ceph_sys2wire(a) if (flags & a) { wire_flags |= CEPH_##a; flags &= ~a; }
43
44 ceph_sys2wire(O_CREAT);
45 ceph_sys2wire(O_EXCL);
46 ceph_sys2wire(O_TRUNC);
47 ceph_sys2wire(O_DIRECTORY);
48 ceph_sys2wire(O_NOFOLLOW);
49
50 #undef ceph_sys2wire
51
52 if (flags)
53 doutc(cl, "unused open flags: %x\n", flags);
54
55 return cpu_to_le32(wire_flags);
56 }
57
58 /*
59 * Ceph file operations
60 *
61 * Implement basic open/close functionality, and implement
62 * read/write.
63 *
64 * We implement three modes of file I/O:
65 * - buffered uses the generic_file_aio_{read,write} helpers
66 *
67 * - synchronous is used when there is multi-client read/write
68 * sharing, avoids the page cache, and synchronously waits for an
69 * ack from the OSD.
70 *
71 * - direct io takes the variant of the sync path that references
72 * user pages directly.
73 *
74 * fsync() flushes and waits on dirty pages, but just queues metadata
75 * for writeback: since the MDS can recover size and mtime there is no
76 * need to wait for MDS acknowledgement.
77 */
78
79 /*
80 * How many pages to get in one call to iov_iter_get_pages(). This
81 * determines the size of the on-stack array used as a buffer.
82 */
83 #define ITER_GET_BVECS_PAGES 64
84
__iter_get_bvecs(struct iov_iter * iter,size_t maxsize,struct bio_vec * bvecs)85 static ssize_t __iter_get_bvecs(struct iov_iter *iter, size_t maxsize,
86 struct bio_vec *bvecs)
87 {
88 size_t size = 0;
89 int bvec_idx = 0;
90
91 if (maxsize > iov_iter_count(iter))
92 maxsize = iov_iter_count(iter);
93
94 while (size < maxsize) {
95 struct page *pages[ITER_GET_BVECS_PAGES];
96 ssize_t bytes;
97 size_t start;
98 int idx = 0;
99
100 bytes = iov_iter_get_pages2(iter, pages, maxsize - size,
101 ITER_GET_BVECS_PAGES, &start);
102 if (bytes < 0)
103 return size ?: bytes;
104
105 size += bytes;
106
107 for ( ; bytes; idx++, bvec_idx++) {
108 int len = min_t(int, bytes, PAGE_SIZE - start);
109
110 bvec_set_page(&bvecs[bvec_idx], pages[idx], len, start);
111 bytes -= len;
112 start = 0;
113 }
114 }
115
116 return size;
117 }
118
119 /*
120 * iov_iter_get_pages() only considers one iov_iter segment, no matter
121 * what maxsize or maxpages are given. For ITER_BVEC that is a single
122 * page.
123 *
124 * Attempt to get up to @maxsize bytes worth of pages from @iter.
125 * Return the number of bytes in the created bio_vec array, or an error.
126 */
iter_get_bvecs_alloc(struct iov_iter * iter,size_t maxsize,struct bio_vec ** bvecs,int * num_bvecs)127 static ssize_t iter_get_bvecs_alloc(struct iov_iter *iter, size_t maxsize,
128 struct bio_vec **bvecs, int *num_bvecs)
129 {
130 struct bio_vec *bv;
131 size_t orig_count = iov_iter_count(iter);
132 ssize_t bytes;
133 int npages;
134
135 iov_iter_truncate(iter, maxsize);
136 npages = iov_iter_npages(iter, INT_MAX);
137 iov_iter_reexpand(iter, orig_count);
138
139 /*
140 * __iter_get_bvecs() may populate only part of the array -- zero it
141 * out.
142 */
143 bv = kvmalloc_array(npages, sizeof(*bv), GFP_KERNEL | __GFP_ZERO);
144 if (!bv)
145 return -ENOMEM;
146
147 bytes = __iter_get_bvecs(iter, maxsize, bv);
148 if (bytes < 0) {
149 /*
150 * No pages were pinned -- just free the array.
151 */
152 kvfree(bv);
153 return bytes;
154 }
155
156 *bvecs = bv;
157 *num_bvecs = npages;
158 return bytes;
159 }
160
put_bvecs(struct bio_vec * bvecs,int num_bvecs,bool should_dirty)161 static void put_bvecs(struct bio_vec *bvecs, int num_bvecs, bool should_dirty)
162 {
163 int i;
164
165 for (i = 0; i < num_bvecs; i++) {
166 if (bvecs[i].bv_page) {
167 if (should_dirty)
168 set_page_dirty_lock(bvecs[i].bv_page);
169 put_page(bvecs[i].bv_page);
170 }
171 }
172 kvfree(bvecs);
173 }
174
175 /*
176 * Prepare an open request. Preallocate ceph_cap to avoid an
177 * inopportune ENOMEM later.
178 */
179 static struct ceph_mds_request *
prepare_open_request(struct super_block * sb,int flags,int create_mode)180 prepare_open_request(struct super_block *sb, int flags, int create_mode)
181 {
182 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(sb);
183 struct ceph_mds_request *req;
184 int want_auth = USE_ANY_MDS;
185 int op = (flags & O_CREAT) ? CEPH_MDS_OP_CREATE : CEPH_MDS_OP_OPEN;
186
187 if (flags & (O_WRONLY|O_RDWR|O_CREAT|O_TRUNC))
188 want_auth = USE_AUTH_MDS;
189
190 req = ceph_mdsc_create_request(mdsc, op, want_auth);
191 if (IS_ERR(req))
192 goto out;
193 req->r_fmode = ceph_flags_to_mode(flags);
194 req->r_args.open.flags = ceph_flags_sys2wire(mdsc, flags);
195 req->r_args.open.mode = cpu_to_le32(create_mode);
196 out:
197 return req;
198 }
199
ceph_init_file_info(struct inode * inode,struct file * file,int fmode,bool isdir)200 static int ceph_init_file_info(struct inode *inode, struct file *file,
201 int fmode, bool isdir)
202 {
203 struct ceph_inode_info *ci = ceph_inode(inode);
204 struct ceph_mount_options *opt =
205 ceph_inode_to_fs_client(&ci->netfs.inode)->mount_options;
206 struct ceph_client *cl = ceph_inode_to_client(inode);
207 struct ceph_file_info *fi;
208 int ret;
209
210 doutc(cl, "%p %llx.%llx %p 0%o (%s)\n", inode, ceph_vinop(inode),
211 file, inode->i_mode, isdir ? "dir" : "regular");
212 BUG_ON(inode->i_fop->release != ceph_release);
213
214 if (isdir) {
215 struct ceph_dir_file_info *dfi =
216 kmem_cache_zalloc(ceph_dir_file_cachep, GFP_KERNEL);
217 if (!dfi)
218 return -ENOMEM;
219
220 file->private_data = dfi;
221 fi = &dfi->file_info;
222 dfi->next_offset = 2;
223 dfi->readdir_cache_idx = -1;
224 } else {
225 fi = kmem_cache_zalloc(ceph_file_cachep, GFP_KERNEL);
226 if (!fi)
227 return -ENOMEM;
228
229 if (opt->flags & CEPH_MOUNT_OPT_NOPAGECACHE)
230 fi->flags |= CEPH_F_SYNC;
231
232 file->private_data = fi;
233 }
234
235 ceph_get_fmode(ci, fmode, 1);
236 fi->fmode = fmode;
237
238 spin_lock_init(&fi->rw_contexts_lock);
239 INIT_LIST_HEAD(&fi->rw_contexts);
240 fi->filp_gen = READ_ONCE(ceph_inode_to_fs_client(inode)->filp_gen);
241
242 if ((file->f_mode & FMODE_WRITE) && ceph_has_inline_data(ci)) {
243 ret = ceph_uninline_data(file);
244 if (ret < 0)
245 goto error;
246 }
247
248 return 0;
249
250 error:
251 ceph_fscache_unuse_cookie(inode, file->f_mode & FMODE_WRITE);
252 ceph_put_fmode(ci, fi->fmode, 1);
253 kmem_cache_free(ceph_file_cachep, fi);
254 /* wake up anyone waiting for caps on this inode */
255 wake_up_all(&ci->i_cap_wq);
256 return ret;
257 }
258
259 /*
260 * initialize private struct file data.
261 * if we fail, clean up by dropping fmode reference on the ceph_inode
262 */
ceph_init_file(struct inode * inode,struct file * file,int fmode)263 static int ceph_init_file(struct inode *inode, struct file *file, int fmode)
264 {
265 struct ceph_client *cl = ceph_inode_to_client(inode);
266 int ret = 0;
267
268 switch (inode->i_mode & S_IFMT) {
269 case S_IFREG:
270 ceph_fscache_use_cookie(inode, file->f_mode & FMODE_WRITE);
271 fallthrough;
272 case S_IFDIR:
273 ret = ceph_init_file_info(inode, file, fmode,
274 S_ISDIR(inode->i_mode));
275 break;
276
277 case S_IFLNK:
278 doutc(cl, "%p %llx.%llx %p 0%o (symlink)\n", inode,
279 ceph_vinop(inode), file, inode->i_mode);
280 break;
281
282 default:
283 doutc(cl, "%p %llx.%llx %p 0%o (special)\n", inode,
284 ceph_vinop(inode), file, inode->i_mode);
285 /*
286 * we need to drop the open ref now, since we don't
287 * have .release set to ceph_release.
288 */
289 BUG_ON(inode->i_fop->release == ceph_release);
290
291 /* call the proper open fop */
292 ret = inode->i_fop->open(inode, file);
293 }
294 return ret;
295 }
296
297 /*
298 * try renew caps after session gets killed.
299 */
ceph_renew_caps(struct inode * inode,int fmode)300 int ceph_renew_caps(struct inode *inode, int fmode)
301 {
302 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
303 struct ceph_client *cl = mdsc->fsc->client;
304 struct ceph_inode_info *ci = ceph_inode(inode);
305 struct ceph_mds_request *req;
306 int err, flags, wanted;
307
308 spin_lock(&ci->i_ceph_lock);
309 __ceph_touch_fmode(ci, mdsc, fmode);
310 wanted = __ceph_caps_file_wanted(ci);
311 if (__ceph_is_any_real_caps(ci) &&
312 (!(wanted & CEPH_CAP_ANY_WR) || ci->i_auth_cap)) {
313 int issued = __ceph_caps_issued(ci, NULL);
314 spin_unlock(&ci->i_ceph_lock);
315 doutc(cl, "%p %llx.%llx want %s issued %s updating mds_wanted\n",
316 inode, ceph_vinop(inode), ceph_cap_string(wanted),
317 ceph_cap_string(issued));
318 ceph_check_caps(ci, 0);
319 return 0;
320 }
321 spin_unlock(&ci->i_ceph_lock);
322
323 flags = 0;
324 if ((wanted & CEPH_CAP_FILE_RD) && (wanted & CEPH_CAP_FILE_WR))
325 flags = O_RDWR;
326 else if (wanted & CEPH_CAP_FILE_RD)
327 flags = O_RDONLY;
328 else if (wanted & CEPH_CAP_FILE_WR)
329 flags = O_WRONLY;
330 #ifdef O_LAZY
331 if (wanted & CEPH_CAP_FILE_LAZYIO)
332 flags |= O_LAZY;
333 #endif
334
335 req = prepare_open_request(inode->i_sb, flags, 0);
336 if (IS_ERR(req)) {
337 err = PTR_ERR(req);
338 goto out;
339 }
340
341 req->r_inode = inode;
342 ihold(inode);
343 req->r_num_caps = 1;
344
345 err = ceph_mdsc_do_request(mdsc, NULL, req);
346 ceph_mdsc_put_request(req);
347 out:
348 doutc(cl, "%p %llx.%llx open result=%d\n", inode, ceph_vinop(inode),
349 err);
350 return err < 0 ? err : 0;
351 }
352
353 /*
354 * If we already have the requisite capabilities, we can satisfy
355 * the open request locally (no need to request new caps from the
356 * MDS). We do, however, need to inform the MDS (asynchronously)
357 * if our wanted caps set expands.
358 */
ceph_open(struct inode * inode,struct file * file)359 int ceph_open(struct inode *inode, struct file *file)
360 {
361 struct ceph_inode_info *ci = ceph_inode(inode);
362 struct ceph_fs_client *fsc = ceph_sb_to_fs_client(inode->i_sb);
363 struct ceph_client *cl = fsc->client;
364 struct ceph_mds_client *mdsc = fsc->mdsc;
365 struct ceph_mds_request *req;
366 struct ceph_file_info *fi = file->private_data;
367 int err;
368 int flags, fmode, wanted;
369 struct dentry *dentry;
370 char *path;
371 bool do_sync = false;
372 int mask = MAY_READ;
373
374 if (fi) {
375 doutc(cl, "file %p is already opened\n", file);
376 return 0;
377 }
378
379 /* filter out O_CREAT|O_EXCL; vfs did that already. yuck. */
380 flags = file->f_flags & ~(O_CREAT|O_EXCL);
381 if (S_ISDIR(inode->i_mode)) {
382 flags = O_DIRECTORY; /* mds likes to know */
383 } else if (S_ISREG(inode->i_mode)) {
384 err = fscrypt_file_open(inode, file);
385 if (err)
386 return err;
387 }
388
389 doutc(cl, "%p %llx.%llx file %p flags %d (%d)\n", inode,
390 ceph_vinop(inode), file, flags, file->f_flags);
391 fmode = ceph_flags_to_mode(flags);
392 wanted = ceph_caps_for_mode(fmode);
393
394 if (fmode & CEPH_FILE_MODE_WR)
395 mask |= MAY_WRITE;
396 dentry = d_find_alias(inode);
397 if (!dentry) {
398 do_sync = true;
399 } else {
400 struct ceph_path_info path_info;
401 path = ceph_mdsc_build_path(mdsc, dentry, &path_info, 0);
402 if (IS_ERR(path)) {
403 do_sync = true;
404 err = 0;
405 } else {
406 err = ceph_mds_check_access(mdsc, path, mask);
407 }
408 ceph_mdsc_free_path_info(&path_info);
409 dput(dentry);
410
411 /* For none EACCES cases will let the MDS do the mds auth check */
412 if (err == -EACCES) {
413 return err;
414 } else if (err < 0) {
415 do_sync = true;
416 err = 0;
417 }
418 }
419
420 /* snapped files are read-only */
421 if (ceph_snap(inode) != CEPH_NOSNAP && (file->f_mode & FMODE_WRITE))
422 return -EROFS;
423
424 /* trivially open snapdir */
425 if (ceph_snap(inode) == CEPH_SNAPDIR) {
426 return ceph_init_file(inode, file, fmode);
427 }
428
429 /*
430 * No need to block if we have caps on the auth MDS (for
431 * write) or any MDS (for read). Update wanted set
432 * asynchronously.
433 */
434 spin_lock(&ci->i_ceph_lock);
435 if (!do_sync && __ceph_is_any_real_caps(ci) &&
436 (((fmode & CEPH_FILE_MODE_WR) == 0) || ci->i_auth_cap)) {
437 int mds_wanted = __ceph_caps_mds_wanted(ci, true);
438 int issued = __ceph_caps_issued(ci, NULL);
439
440 doutc(cl, "open %p fmode %d want %s issued %s using existing\n",
441 inode, fmode, ceph_cap_string(wanted),
442 ceph_cap_string(issued));
443 __ceph_touch_fmode(ci, mdsc, fmode);
444 spin_unlock(&ci->i_ceph_lock);
445
446 /* adjust wanted? */
447 if ((issued & wanted) != wanted &&
448 (mds_wanted & wanted) != wanted &&
449 ceph_snap(inode) != CEPH_SNAPDIR)
450 ceph_check_caps(ci, 0);
451
452 return ceph_init_file(inode, file, fmode);
453 } else if (!do_sync && ceph_snap(inode) != CEPH_NOSNAP &&
454 (ci->i_snap_caps & wanted) == wanted) {
455 __ceph_touch_fmode(ci, mdsc, fmode);
456 spin_unlock(&ci->i_ceph_lock);
457 return ceph_init_file(inode, file, fmode);
458 }
459
460 spin_unlock(&ci->i_ceph_lock);
461
462 doutc(cl, "open fmode %d wants %s\n", fmode, ceph_cap_string(wanted));
463 req = prepare_open_request(inode->i_sb, flags, 0);
464 if (IS_ERR(req)) {
465 err = PTR_ERR(req);
466 goto out;
467 }
468 req->r_inode = inode;
469 ihold(inode);
470
471 req->r_num_caps = 1;
472 err = ceph_mdsc_do_request(mdsc, NULL, req);
473 if (!err)
474 err = ceph_init_file(inode, file, req->r_fmode);
475 ceph_mdsc_put_request(req);
476 doutc(cl, "open result=%d on %llx.%llx\n", err, ceph_vinop(inode));
477 out:
478 return err;
479 }
480
481 /* Clone the layout from a synchronous create, if the dir now has Dc caps */
482 static void
cache_file_layout(struct inode * dst,struct inode * src)483 cache_file_layout(struct inode *dst, struct inode *src)
484 {
485 struct ceph_inode_info *cdst = ceph_inode(dst);
486 struct ceph_inode_info *csrc = ceph_inode(src);
487
488 spin_lock(&cdst->i_ceph_lock);
489 if ((__ceph_caps_issued(cdst, NULL) & CEPH_CAP_DIR_CREATE) &&
490 !ceph_file_layout_is_valid(&cdst->i_cached_layout)) {
491 memcpy(&cdst->i_cached_layout, &csrc->i_layout,
492 sizeof(cdst->i_cached_layout));
493 rcu_assign_pointer(cdst->i_cached_layout.pool_ns,
494 ceph_try_get_string(csrc->i_layout.pool_ns));
495 }
496 spin_unlock(&cdst->i_ceph_lock);
497 }
498
499 /*
500 * Try to set up an async create. We need caps, a file layout, and inode number,
501 * and either a lease on the dentry or complete dir info. If any of those
502 * criteria are not satisfied, then return false and the caller can go
503 * synchronous.
504 */
try_prep_async_create(struct inode * dir,struct dentry * dentry,struct ceph_file_layout * lo,u64 * pino)505 static int try_prep_async_create(struct inode *dir, struct dentry *dentry,
506 struct ceph_file_layout *lo, u64 *pino)
507 {
508 struct ceph_inode_info *ci = ceph_inode(dir);
509 struct ceph_dentry_info *di = ceph_dentry(dentry);
510 int got = 0, want = CEPH_CAP_FILE_EXCL | CEPH_CAP_DIR_CREATE;
511 u64 ino;
512
513 spin_lock(&ci->i_ceph_lock);
514 /* No auth cap means no chance for Dc caps */
515 if (!ci->i_auth_cap)
516 goto no_async;
517
518 /* Any delegated inos? */
519 if (xa_empty(&ci->i_auth_cap->session->s_delegated_inos))
520 goto no_async;
521
522 if (!ceph_file_layout_is_valid(&ci->i_cached_layout))
523 goto no_async;
524
525 if ((__ceph_caps_issued(ci, NULL) & want) != want)
526 goto no_async;
527
528 if (d_in_lookup(dentry)) {
529 if (!__ceph_dir_is_complete(ci))
530 goto no_async;
531 spin_lock(&dentry->d_lock);
532 di->lease_shared_gen = atomic_read(&ci->i_shared_gen);
533 spin_unlock(&dentry->d_lock);
534 } else if (atomic_read(&ci->i_shared_gen) !=
535 READ_ONCE(di->lease_shared_gen)) {
536 goto no_async;
537 }
538
539 ino = ceph_get_deleg_ino(ci->i_auth_cap->session);
540 if (!ino)
541 goto no_async;
542
543 *pino = ino;
544 ceph_take_cap_refs(ci, want, false);
545 memcpy(lo, &ci->i_cached_layout, sizeof(*lo));
546 rcu_assign_pointer(lo->pool_ns,
547 ceph_try_get_string(ci->i_cached_layout.pool_ns));
548 got = want;
549 no_async:
550 spin_unlock(&ci->i_ceph_lock);
551 return got;
552 }
553
restore_deleg_ino(struct inode * dir,u64 ino)554 static void restore_deleg_ino(struct inode *dir, u64 ino)
555 {
556 struct ceph_client *cl = ceph_inode_to_client(dir);
557 struct ceph_inode_info *ci = ceph_inode(dir);
558 struct ceph_mds_session *s = NULL;
559
560 spin_lock(&ci->i_ceph_lock);
561 if (ci->i_auth_cap)
562 s = ceph_get_mds_session(ci->i_auth_cap->session);
563 spin_unlock(&ci->i_ceph_lock);
564 if (s) {
565 int err = ceph_restore_deleg_ino(s, ino);
566 if (err)
567 pr_warn_client(cl,
568 "unable to restore delegated ino 0x%llx to session: %d\n",
569 ino, err);
570 ceph_put_mds_session(s);
571 }
572 }
573
wake_async_create_waiters(struct inode * inode,struct ceph_mds_session * session)574 static void wake_async_create_waiters(struct inode *inode,
575 struct ceph_mds_session *session)
576 {
577 struct ceph_inode_info *ci = ceph_inode(inode);
578 bool check_cap = false;
579
580 spin_lock(&ci->i_ceph_lock);
581 if (ci->i_ceph_flags & CEPH_I_ASYNC_CREATE) {
582 clear_and_wake_up_bit(CEPH_ASYNC_CREATE_BIT, &ci->i_ceph_flags);
583
584 if (ci->i_ceph_flags & CEPH_I_ASYNC_CHECK_CAPS) {
585 ci->i_ceph_flags &= ~CEPH_I_ASYNC_CHECK_CAPS;
586 check_cap = true;
587 }
588 }
589 ceph_kick_flushing_inode_caps(session, ci);
590 spin_unlock(&ci->i_ceph_lock);
591
592 if (check_cap)
593 ceph_check_caps(ci, CHECK_CAPS_FLUSH);
594 }
595
ceph_async_create_cb(struct ceph_mds_client * mdsc,struct ceph_mds_request * req)596 static void ceph_async_create_cb(struct ceph_mds_client *mdsc,
597 struct ceph_mds_request *req)
598 {
599 struct ceph_client *cl = mdsc->fsc->client;
600 struct dentry *dentry = req->r_dentry;
601 struct inode *dinode = d_inode(dentry);
602 struct inode *tinode = req->r_target_inode;
603 int result = req->r_err ? req->r_err :
604 le32_to_cpu(req->r_reply_info.head->result);
605
606 WARN_ON_ONCE(dinode && tinode && dinode != tinode);
607
608 /* MDS changed -- caller must resubmit */
609 if (result == -EJUKEBOX)
610 goto out;
611
612 mapping_set_error(req->r_parent->i_mapping, result);
613
614 if (result) {
615 struct ceph_path_info path_info = {0};
616 char *path = ceph_mdsc_build_path(mdsc, req->r_dentry, &path_info, 0);
617
618 pr_warn_client(cl,
619 "async create failure path=(%llx)%s result=%d!\n",
620 path_info.vino.ino, IS_ERR(path) ? "<<bad>>" : path, result);
621 ceph_mdsc_free_path_info(&path_info);
622
623 ceph_dir_clear_complete(req->r_parent);
624 if (!d_unhashed(dentry))
625 d_drop(dentry);
626
627 if (dinode) {
628 mapping_set_error(dinode->i_mapping, result);
629 ceph_inode_shutdown(dinode);
630 wake_async_create_waiters(dinode, req->r_session);
631 }
632 }
633
634 if (tinode) {
635 u64 ino = ceph_vino(tinode).ino;
636
637 if (req->r_deleg_ino != ino)
638 pr_warn_client(cl,
639 "inode number mismatch! err=%d deleg_ino=0x%llx target=0x%llx\n",
640 req->r_err, req->r_deleg_ino, ino);
641
642 mapping_set_error(tinode->i_mapping, result);
643 wake_async_create_waiters(tinode, req->r_session);
644 } else if (!result) {
645 pr_warn_client(cl, "no req->r_target_inode for 0x%llx\n",
646 req->r_deleg_ino);
647 }
648 out:
649 ceph_mdsc_release_dir_caps(req);
650 }
651
ceph_finish_async_create(struct inode * dir,struct inode * inode,struct dentry * dentry,struct file * file,umode_t mode,struct ceph_mds_request * req,struct ceph_acl_sec_ctx * as_ctx,struct ceph_file_layout * lo)652 static int ceph_finish_async_create(struct inode *dir, struct inode *inode,
653 struct dentry *dentry,
654 struct file *file, umode_t mode,
655 struct ceph_mds_request *req,
656 struct ceph_acl_sec_ctx *as_ctx,
657 struct ceph_file_layout *lo)
658 {
659 int ret;
660 char xattr_buf[4];
661 struct ceph_mds_reply_inode in = { };
662 struct ceph_mds_reply_info_in iinfo = { .in = &in };
663 struct ceph_inode_info *ci = ceph_inode(dir);
664 struct ceph_dentry_info *di = ceph_dentry(dentry);
665 struct timespec64 now;
666 struct ceph_string *pool_ns;
667 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb);
668 struct ceph_client *cl = mdsc->fsc->client;
669 struct ceph_vino vino = { .ino = req->r_deleg_ino,
670 .snap = CEPH_NOSNAP };
671
672 ktime_get_real_ts64(&now);
673
674 iinfo.inline_version = CEPH_INLINE_NONE;
675 iinfo.change_attr = 1;
676 ceph_encode_timespec64(&iinfo.btime, &now);
677
678 if (req->r_pagelist) {
679 iinfo.xattr_len = req->r_pagelist->length;
680 iinfo.xattr_data = req->r_pagelist->mapped_tail;
681 } else {
682 /* fake it */
683 iinfo.xattr_len = ARRAY_SIZE(xattr_buf);
684 iinfo.xattr_data = xattr_buf;
685 memset(iinfo.xattr_data, 0, iinfo.xattr_len);
686 }
687
688 in.ino = cpu_to_le64(vino.ino);
689 in.snapid = cpu_to_le64(CEPH_NOSNAP);
690 in.version = cpu_to_le64(1); // ???
691 in.cap.caps = in.cap.wanted = cpu_to_le32(CEPH_CAP_ALL_FILE);
692 in.cap.cap_id = cpu_to_le64(1);
693 in.cap.realm = cpu_to_le64(ci->i_snap_realm->ino);
694 in.cap.flags = CEPH_CAP_FLAG_AUTH;
695 in.ctime = in.mtime = in.atime = iinfo.btime;
696 in.truncate_seq = cpu_to_le32(1);
697 in.truncate_size = cpu_to_le64(-1ULL);
698 in.xattr_version = cpu_to_le64(1);
699 in.uid = cpu_to_le32(from_kuid(&init_user_ns,
700 mapped_fsuid(req->r_mnt_idmap,
701 &init_user_ns)));
702 if (dir->i_mode & S_ISGID) {
703 in.gid = cpu_to_le32(from_kgid(&init_user_ns, dir->i_gid));
704
705 /* Directories always inherit the setgid bit. */
706 if (S_ISDIR(mode))
707 mode |= S_ISGID;
708 } else {
709 in.gid = cpu_to_le32(from_kgid(&init_user_ns,
710 mapped_fsgid(req->r_mnt_idmap,
711 &init_user_ns)));
712 }
713 in.mode = cpu_to_le32((u32)mode);
714
715 in.nlink = cpu_to_le32(1);
716 in.max_size = cpu_to_le64(lo->stripe_unit);
717
718 ceph_file_layout_to_legacy(lo, &in.layout);
719 /* lo is private, so pool_ns can't change */
720 pool_ns = rcu_dereference_raw(lo->pool_ns);
721 if (pool_ns) {
722 iinfo.pool_ns_len = pool_ns->len;
723 iinfo.pool_ns_data = pool_ns->str;
724 }
725
726 down_read(&mdsc->snap_rwsem);
727 ret = ceph_fill_inode(inode, NULL, &iinfo, NULL, req->r_session,
728 req->r_fmode, NULL);
729 up_read(&mdsc->snap_rwsem);
730 if (ret) {
731 doutc(cl, "failed to fill inode: %d\n", ret);
732 ceph_dir_clear_complete(dir);
733 if (!d_unhashed(dentry))
734 d_drop(dentry);
735 discard_new_inode(inode);
736 } else {
737 struct dentry *dn;
738
739 doutc(cl, "d_adding new inode 0x%llx to 0x%llx/%s\n",
740 vino.ino, ceph_ino(dir), dentry->d_name.name);
741 ceph_dir_clear_ordered(dir);
742 ceph_init_inode_acls(inode, as_ctx);
743 if (inode->i_state & I_NEW) {
744 /*
745 * If it's not I_NEW, then someone created this before
746 * we got here. Assume the server is aware of it at
747 * that point and don't worry about setting
748 * CEPH_I_ASYNC_CREATE.
749 */
750 ceph_inode(inode)->i_ceph_flags = CEPH_I_ASYNC_CREATE;
751 unlock_new_inode(inode);
752 }
753 if (d_in_lookup(dentry) || d_really_is_negative(dentry)) {
754 if (!d_unhashed(dentry))
755 d_drop(dentry);
756 dn = d_splice_alias(inode, dentry);
757 WARN_ON_ONCE(dn && dn != dentry);
758 }
759 file->f_mode |= FMODE_CREATED;
760 ret = finish_open(file, dentry, ceph_open);
761 }
762
763 spin_lock(&dentry->d_lock);
764 clear_and_wake_up_bit(CEPH_DENTRY_ASYNC_CREATE_BIT, &di->flags);
765 spin_unlock(&dentry->d_lock);
766
767 return ret;
768 }
769
770 /*
771 * Do a lookup + open with a single request. If we get a non-existent
772 * file or symlink, return 1 so the VFS can retry.
773 */
ceph_atomic_open(struct inode * dir,struct dentry * dentry,struct file * file,unsigned flags,umode_t mode)774 int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
775 struct file *file, unsigned flags, umode_t mode)
776 {
777 struct mnt_idmap *idmap = file_mnt_idmap(file);
778 struct ceph_fs_client *fsc = ceph_sb_to_fs_client(dir->i_sb);
779 struct ceph_client *cl = fsc->client;
780 struct ceph_mds_client *mdsc = fsc->mdsc;
781 struct ceph_mds_request *req;
782 struct inode *new_inode = NULL;
783 struct dentry *dn;
784 struct ceph_acl_sec_ctx as_ctx = {};
785 bool try_async = ceph_test_mount_opt(fsc, ASYNC_DIROPS);
786 int mask;
787 int err;
788 char *path;
789
790 doutc(cl, "%p %llx.%llx dentry %p '%pd' %s flags %d mode 0%o\n",
791 dir, ceph_vinop(dir), dentry, dentry,
792 d_unhashed(dentry) ? "unhashed" : "hashed", flags, mode);
793
794 if (dentry->d_name.len > NAME_MAX)
795 return -ENAMETOOLONG;
796
797 err = ceph_wait_on_conflict_unlink(dentry);
798 if (err)
799 return err;
800 /*
801 * Do not truncate the file, since atomic_open is called before the
802 * permission check. The caller will do the truncation afterward.
803 */
804 flags &= ~O_TRUNC;
805
806 dn = d_find_alias(dir);
807 if (!dn) {
808 try_async = false;
809 } else {
810 struct ceph_path_info path_info;
811 path = ceph_mdsc_build_path(mdsc, dn, &path_info, 0);
812 if (IS_ERR(path)) {
813 try_async = false;
814 err = 0;
815 } else {
816 int fmode = ceph_flags_to_mode(flags);
817
818 mask = MAY_READ;
819 if (fmode & CEPH_FILE_MODE_WR)
820 mask |= MAY_WRITE;
821 err = ceph_mds_check_access(mdsc, path, mask);
822 }
823 ceph_mdsc_free_path_info(&path_info);
824 dput(dn);
825
826 /* For none EACCES cases will let the MDS do the mds auth check */
827 if (err == -EACCES) {
828 return err;
829 } else if (err < 0) {
830 try_async = false;
831 err = 0;
832 }
833 }
834
835 retry:
836 if (flags & O_CREAT) {
837 if (ceph_quota_is_max_files_exceeded(dir))
838 return -EDQUOT;
839
840 new_inode = ceph_new_inode(dir, dentry, &mode, &as_ctx);
841 if (IS_ERR(new_inode)) {
842 err = PTR_ERR(new_inode);
843 goto out_ctx;
844 }
845 /* Async create can't handle more than a page of xattrs */
846 if (as_ctx.pagelist &&
847 !list_is_singular(&as_ctx.pagelist->head))
848 try_async = false;
849 } else if (!d_in_lookup(dentry)) {
850 /* If it's not being looked up, it's negative */
851 return -ENOENT;
852 }
853
854 /* do the open */
855 req = prepare_open_request(dir->i_sb, flags, mode);
856 if (IS_ERR(req)) {
857 err = PTR_ERR(req);
858 goto out_ctx;
859 }
860 req->r_dentry = dget(dentry);
861 req->r_num_caps = 2;
862 mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED;
863 if (ceph_security_xattr_wanted(dir))
864 mask |= CEPH_CAP_XATTR_SHARED;
865 req->r_args.open.mask = cpu_to_le32(mask);
866 req->r_parent = dir;
867 if (req->r_op == CEPH_MDS_OP_CREATE)
868 req->r_mnt_idmap = mnt_idmap_get(idmap);
869 ihold(dir);
870 if (IS_ENCRYPTED(dir)) {
871 set_bit(CEPH_MDS_R_FSCRYPT_FILE, &req->r_req_flags);
872 err = fscrypt_prepare_lookup_partial(dir, dentry);
873 if (err < 0)
874 goto out_req;
875 }
876
877 if (flags & O_CREAT) {
878 struct ceph_file_layout lo;
879
880 req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL |
881 CEPH_CAP_XATTR_EXCL;
882 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
883
884 ceph_as_ctx_to_req(req, &as_ctx);
885
886 if (try_async && (req->r_dir_caps =
887 try_prep_async_create(dir, dentry, &lo,
888 &req->r_deleg_ino))) {
889 struct ceph_vino vino = { .ino = req->r_deleg_ino,
890 .snap = CEPH_NOSNAP };
891 struct ceph_dentry_info *di = ceph_dentry(dentry);
892
893 set_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags);
894 req->r_args.open.flags |= cpu_to_le32(CEPH_O_EXCL);
895 req->r_callback = ceph_async_create_cb;
896
897 /* Hash inode before RPC */
898 new_inode = ceph_get_inode(dir->i_sb, vino, new_inode);
899 if (IS_ERR(new_inode)) {
900 err = PTR_ERR(new_inode);
901 new_inode = NULL;
902 goto out_req;
903 }
904 WARN_ON_ONCE(!(new_inode->i_state & I_NEW));
905
906 spin_lock(&dentry->d_lock);
907 di->flags |= CEPH_DENTRY_ASYNC_CREATE;
908 spin_unlock(&dentry->d_lock);
909
910 err = ceph_mdsc_submit_request(mdsc, dir, req);
911 if (!err) {
912 err = ceph_finish_async_create(dir, new_inode,
913 dentry, file,
914 mode, req,
915 &as_ctx, &lo);
916 new_inode = NULL;
917 } else if (err == -EJUKEBOX) {
918 restore_deleg_ino(dir, req->r_deleg_ino);
919 ceph_mdsc_put_request(req);
920 discard_new_inode(new_inode);
921 ceph_release_acl_sec_ctx(&as_ctx);
922 memset(&as_ctx, 0, sizeof(as_ctx));
923 new_inode = NULL;
924 try_async = false;
925 ceph_put_string(rcu_dereference_raw(lo.pool_ns));
926 goto retry;
927 }
928 ceph_put_string(rcu_dereference_raw(lo.pool_ns));
929 goto out_req;
930 }
931 }
932
933 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
934 req->r_new_inode = new_inode;
935 new_inode = NULL;
936 err = ceph_mdsc_do_request(mdsc, (flags & O_CREAT) ? dir : NULL, req);
937 if (err == -ENOENT) {
938 dentry = ceph_handle_snapdir(req, dentry);
939 if (IS_ERR(dentry)) {
940 err = PTR_ERR(dentry);
941 goto out_req;
942 }
943 err = 0;
944 }
945
946 if (!err && (flags & O_CREAT) && !req->r_reply_info.head->is_dentry)
947 err = ceph_handle_notrace_create(dir, dentry);
948
949 if (d_in_lookup(dentry)) {
950 dn = ceph_finish_lookup(req, dentry, err);
951 if (IS_ERR(dn))
952 err = PTR_ERR(dn);
953 } else {
954 /* we were given a hashed negative dentry */
955 dn = NULL;
956 }
957 if (err)
958 goto out_req;
959 if (dn || d_really_is_negative(dentry) || d_is_symlink(dentry)) {
960 /* make vfs retry on splice, ENOENT, or symlink */
961 doutc(cl, "finish_no_open on dn %p\n", dn);
962 err = finish_no_open(file, dn);
963 } else {
964 if (IS_ENCRYPTED(dir) &&
965 !fscrypt_has_permitted_context(dir, d_inode(dentry))) {
966 pr_warn_client(cl,
967 "Inconsistent encryption context (parent %llx:%llx child %llx:%llx)\n",
968 ceph_vinop(dir), ceph_vinop(d_inode(dentry)));
969 goto out_req;
970 }
971
972 doutc(cl, "finish_open on dn %p\n", dn);
973 if (req->r_op == CEPH_MDS_OP_CREATE && req->r_reply_info.has_create_ino) {
974 struct inode *newino = d_inode(dentry);
975
976 cache_file_layout(dir, newino);
977 ceph_init_inode_acls(newino, &as_ctx);
978 file->f_mode |= FMODE_CREATED;
979 }
980 err = finish_open(file, dentry, ceph_open);
981 }
982 out_req:
983 ceph_mdsc_put_request(req);
984 iput(new_inode);
985 out_ctx:
986 ceph_release_acl_sec_ctx(&as_ctx);
987 doutc(cl, "result=%d\n", err);
988 return err;
989 }
990
ceph_release(struct inode * inode,struct file * file)991 int ceph_release(struct inode *inode, struct file *file)
992 {
993 struct ceph_client *cl = ceph_inode_to_client(inode);
994 struct ceph_inode_info *ci = ceph_inode(inode);
995
996 if (S_ISDIR(inode->i_mode)) {
997 struct ceph_dir_file_info *dfi = file->private_data;
998 doutc(cl, "%p %llx.%llx dir file %p\n", inode,
999 ceph_vinop(inode), file);
1000 WARN_ON(!list_empty(&dfi->file_info.rw_contexts));
1001
1002 ceph_put_fmode(ci, dfi->file_info.fmode, 1);
1003
1004 if (dfi->last_readdir)
1005 ceph_mdsc_put_request(dfi->last_readdir);
1006 kfree(dfi->last_name);
1007 kfree(dfi->dir_info);
1008 kmem_cache_free(ceph_dir_file_cachep, dfi);
1009 } else {
1010 struct ceph_file_info *fi = file->private_data;
1011 doutc(cl, "%p %llx.%llx regular file %p\n", inode,
1012 ceph_vinop(inode), file);
1013 WARN_ON(!list_empty(&fi->rw_contexts));
1014
1015 ceph_fscache_unuse_cookie(inode, file->f_mode & FMODE_WRITE);
1016 ceph_put_fmode(ci, fi->fmode, 1);
1017
1018 kmem_cache_free(ceph_file_cachep, fi);
1019 }
1020
1021 /* wake up anyone waiting for caps on this inode */
1022 wake_up_all(&ci->i_cap_wq);
1023 return 0;
1024 }
1025
1026 enum {
1027 HAVE_RETRIED = 1,
1028 CHECK_EOF = 2,
1029 READ_INLINE = 3,
1030 };
1031
1032 /*
1033 * Completely synchronous read and write methods. Direct from __user
1034 * buffer to osd, or directly to user pages (if O_DIRECT).
1035 *
1036 * If the read spans object boundary, just do multiple reads. (That's not
1037 * atomic, but good enough for now.)
1038 *
1039 * If we get a short result from the OSD, check against i_size; we need to
1040 * only return a short read to the caller if we hit EOF.
1041 */
__ceph_sync_read(struct inode * inode,loff_t * ki_pos,struct iov_iter * to,int * retry_op,u64 * last_objver)1042 ssize_t __ceph_sync_read(struct inode *inode, loff_t *ki_pos,
1043 struct iov_iter *to, int *retry_op,
1044 u64 *last_objver)
1045 {
1046 struct ceph_inode_info *ci = ceph_inode(inode);
1047 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
1048 struct ceph_client *cl = fsc->client;
1049 struct ceph_osd_client *osdc = &fsc->client->osdc;
1050 ssize_t ret;
1051 u64 off = *ki_pos;
1052 u64 len = iov_iter_count(to);
1053 u64 i_size = i_size_read(inode);
1054 bool sparse = IS_ENCRYPTED(inode) || ceph_test_mount_opt(fsc, SPARSEREAD);
1055 u64 objver = 0;
1056
1057 doutc(cl, "on inode %p %llx.%llx %llx~%llx\n", inode,
1058 ceph_vinop(inode), *ki_pos, len);
1059
1060 if (ceph_inode_is_shutdown(inode))
1061 return -EIO;
1062
1063 if (!len || !i_size)
1064 return 0;
1065 /*
1066 * flush any page cache pages in this range. this
1067 * will make concurrent normal and sync io slow,
1068 * but it will at least behave sensibly when they are
1069 * in sequence.
1070 */
1071 ret = filemap_write_and_wait_range(inode->i_mapping,
1072 off, off + len - 1);
1073 if (ret < 0)
1074 return ret;
1075
1076 ret = 0;
1077 while ((len = iov_iter_count(to)) > 0) {
1078 struct ceph_osd_request *req;
1079 struct page **pages;
1080 int num_pages;
1081 size_t page_off;
1082 bool more;
1083 int idx = 0;
1084 size_t left;
1085 struct ceph_osd_req_op *op;
1086 u64 read_off = off;
1087 u64 read_len = len;
1088 int extent_cnt;
1089
1090 /* determine new offset/length if encrypted */
1091 ceph_fscrypt_adjust_off_and_len(inode, &read_off, &read_len);
1092
1093 doutc(cl, "orig %llu~%llu reading %llu~%llu", off, len,
1094 read_off, read_len);
1095
1096 req = ceph_osdc_new_request(osdc, &ci->i_layout,
1097 ci->i_vino, read_off, &read_len, 0, 1,
1098 sparse ? CEPH_OSD_OP_SPARSE_READ :
1099 CEPH_OSD_OP_READ,
1100 CEPH_OSD_FLAG_READ,
1101 NULL, ci->i_truncate_seq,
1102 ci->i_truncate_size, false);
1103 if (IS_ERR(req)) {
1104 ret = PTR_ERR(req);
1105 break;
1106 }
1107
1108 /* adjust len downward if the request truncated the len */
1109 if (off + len > read_off + read_len)
1110 len = read_off + read_len - off;
1111 more = len < iov_iter_count(to);
1112
1113 op = &req->r_ops[0];
1114 if (sparse) {
1115 extent_cnt = __ceph_sparse_read_ext_count(inode, read_len);
1116 ret = ceph_alloc_sparse_ext_map(op, extent_cnt);
1117 if (ret) {
1118 ceph_osdc_put_request(req);
1119 break;
1120 }
1121 }
1122
1123 num_pages = calc_pages_for(read_off, read_len);
1124 page_off = offset_in_page(off);
1125 pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL);
1126 if (IS_ERR(pages)) {
1127 ceph_osdc_put_request(req);
1128 ret = PTR_ERR(pages);
1129 break;
1130 }
1131
1132 osd_req_op_extent_osd_data_pages(req, 0, pages, read_len,
1133 offset_in_page(read_off),
1134 false, true);
1135
1136 ceph_osdc_start_request(osdc, req);
1137 ret = ceph_osdc_wait_request(osdc, req);
1138
1139 ceph_update_read_metrics(&fsc->mdsc->metric,
1140 req->r_start_latency,
1141 req->r_end_latency,
1142 read_len, ret);
1143
1144 if (ret > 0)
1145 objver = req->r_version;
1146
1147 i_size = i_size_read(inode);
1148 doutc(cl, "%llu~%llu got %zd i_size %llu%s\n", off, len,
1149 ret, i_size, (more ? " MORE" : ""));
1150
1151 /* Fix it to go to end of extent map */
1152 if (sparse && ret >= 0)
1153 ret = ceph_sparse_ext_map_end(op);
1154 else if (ret == -ENOENT)
1155 ret = 0;
1156
1157 if (ret < 0) {
1158 ceph_osdc_put_request(req);
1159 if (ret == -EBLOCKLISTED)
1160 fsc->blocklisted = true;
1161 break;
1162 }
1163
1164 if (IS_ENCRYPTED(inode)) {
1165 int fret;
1166
1167 fret = ceph_fscrypt_decrypt_extents(inode, pages,
1168 read_off, op->extent.sparse_ext,
1169 op->extent.sparse_ext_cnt);
1170 if (fret < 0) {
1171 ret = fret;
1172 ceph_osdc_put_request(req);
1173 break;
1174 }
1175
1176 /* account for any partial block at the beginning */
1177 fret -= (off - read_off);
1178
1179 /*
1180 * Short read after big offset adjustment?
1181 * Nothing is usable, just call it a zero
1182 * len read.
1183 */
1184 fret = max(fret, 0);
1185
1186 /* account for partial block at the end */
1187 ret = min_t(ssize_t, fret, len);
1188 }
1189
1190 /* Short read but not EOF? Zero out the remainder. */
1191 if (ret < len && (off + ret < i_size)) {
1192 int zlen = min(len - ret, i_size - off - ret);
1193 int zoff = page_off + ret;
1194
1195 doutc(cl, "zero gap %llu~%llu\n", off + ret,
1196 off + ret + zlen);
1197 ceph_zero_page_vector_range(zoff, zlen, pages);
1198 ret += zlen;
1199 }
1200
1201 if (off + ret > i_size)
1202 left = (i_size > off) ? i_size - off : 0;
1203 else
1204 left = ret;
1205
1206 while (left > 0) {
1207 size_t plen, copied;
1208
1209 plen = min_t(size_t, left, PAGE_SIZE - page_off);
1210 SetPageUptodate(pages[idx]);
1211 copied = copy_page_to_iter(pages[idx++],
1212 page_off, plen, to);
1213 off += copied;
1214 left -= copied;
1215 page_off = 0;
1216 if (copied < plen) {
1217 ret = -EFAULT;
1218 break;
1219 }
1220 }
1221
1222 ceph_osdc_put_request(req);
1223
1224 if (off >= i_size || !more)
1225 break;
1226 }
1227
1228 if (ret > 0) {
1229 if (off >= i_size) {
1230 *retry_op = CHECK_EOF;
1231 ret = i_size - *ki_pos;
1232 *ki_pos = i_size;
1233 } else {
1234 ret = off - *ki_pos;
1235 *ki_pos = off;
1236 }
1237
1238 if (last_objver)
1239 *last_objver = objver;
1240 }
1241 doutc(cl, "result %zd retry_op %d\n", ret, *retry_op);
1242 return ret;
1243 }
1244
ceph_sync_read(struct kiocb * iocb,struct iov_iter * to,int * retry_op)1245 static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *to,
1246 int *retry_op)
1247 {
1248 struct file *file = iocb->ki_filp;
1249 struct inode *inode = file_inode(file);
1250 struct ceph_client *cl = ceph_inode_to_client(inode);
1251
1252 doutc(cl, "on file %p %llx~%zx %s\n", file, iocb->ki_pos,
1253 iov_iter_count(to),
1254 (file->f_flags & O_DIRECT) ? "O_DIRECT" : "");
1255
1256 return __ceph_sync_read(inode, &iocb->ki_pos, to, retry_op, NULL);
1257 }
1258
1259 struct ceph_aio_request {
1260 struct kiocb *iocb;
1261 size_t total_len;
1262 bool write;
1263 bool should_dirty;
1264 int error;
1265 struct list_head osd_reqs;
1266 unsigned num_reqs;
1267 atomic_t pending_reqs;
1268 struct timespec64 mtime;
1269 struct ceph_cap_flush *prealloc_cf;
1270 };
1271
1272 struct ceph_aio_work {
1273 struct work_struct work;
1274 struct ceph_osd_request *req;
1275 };
1276
1277 static void ceph_aio_retry_work(struct work_struct *work);
1278
ceph_aio_complete(struct inode * inode,struct ceph_aio_request * aio_req)1279 static void ceph_aio_complete(struct inode *inode,
1280 struct ceph_aio_request *aio_req)
1281 {
1282 struct ceph_client *cl = ceph_inode_to_client(inode);
1283 struct ceph_inode_info *ci = ceph_inode(inode);
1284 int ret;
1285
1286 if (!atomic_dec_and_test(&aio_req->pending_reqs))
1287 return;
1288
1289 if (aio_req->iocb->ki_flags & IOCB_DIRECT)
1290 inode_dio_end(inode);
1291
1292 ret = aio_req->error;
1293 if (!ret)
1294 ret = aio_req->total_len;
1295
1296 doutc(cl, "%p %llx.%llx rc %d\n", inode, ceph_vinop(inode), ret);
1297
1298 if (ret >= 0 && aio_req->write) {
1299 int dirty;
1300
1301 loff_t endoff = aio_req->iocb->ki_pos + aio_req->total_len;
1302 if (endoff > i_size_read(inode)) {
1303 if (ceph_inode_set_size(inode, endoff))
1304 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY);
1305 }
1306
1307 spin_lock(&ci->i_ceph_lock);
1308 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
1309 &aio_req->prealloc_cf);
1310 spin_unlock(&ci->i_ceph_lock);
1311 if (dirty)
1312 __mark_inode_dirty(inode, dirty);
1313
1314 }
1315
1316 ceph_put_cap_refs(ci, (aio_req->write ? CEPH_CAP_FILE_WR :
1317 CEPH_CAP_FILE_RD));
1318
1319 aio_req->iocb->ki_complete(aio_req->iocb, ret);
1320
1321 ceph_free_cap_flush(aio_req->prealloc_cf);
1322 kfree(aio_req);
1323 }
1324
ceph_aio_complete_req(struct ceph_osd_request * req)1325 static void ceph_aio_complete_req(struct ceph_osd_request *req)
1326 {
1327 int rc = req->r_result;
1328 struct inode *inode = req->r_inode;
1329 struct ceph_aio_request *aio_req = req->r_priv;
1330 struct ceph_osd_data *osd_data = osd_req_op_extent_osd_data(req, 0);
1331 struct ceph_osd_req_op *op = &req->r_ops[0];
1332 struct ceph_client_metric *metric = &ceph_sb_to_mdsc(inode->i_sb)->metric;
1333 unsigned int len = osd_data->bvec_pos.iter.bi_size;
1334 bool sparse = (op->op == CEPH_OSD_OP_SPARSE_READ);
1335 struct ceph_client *cl = ceph_inode_to_client(inode);
1336
1337 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_BVECS);
1338 BUG_ON(!osd_data->num_bvecs);
1339
1340 doutc(cl, "req %p inode %p %llx.%llx, rc %d bytes %u\n", req,
1341 inode, ceph_vinop(inode), rc, len);
1342
1343 if (rc == -EOLDSNAPC) {
1344 struct ceph_aio_work *aio_work;
1345 BUG_ON(!aio_req->write);
1346
1347 aio_work = kmalloc(sizeof(*aio_work), GFP_NOFS);
1348 if (aio_work) {
1349 INIT_WORK(&aio_work->work, ceph_aio_retry_work);
1350 aio_work->req = req;
1351 queue_work(ceph_inode_to_fs_client(inode)->inode_wq,
1352 &aio_work->work);
1353 return;
1354 }
1355 rc = -ENOMEM;
1356 } else if (!aio_req->write) {
1357 if (sparse && rc >= 0)
1358 rc = ceph_sparse_ext_map_end(op);
1359 if (rc == -ENOENT)
1360 rc = 0;
1361 if (rc >= 0 && len > rc) {
1362 struct iov_iter i;
1363 int zlen = len - rc;
1364
1365 /*
1366 * If read is satisfied by single OSD request,
1367 * it can pass EOF. Otherwise read is within
1368 * i_size.
1369 */
1370 if (aio_req->num_reqs == 1) {
1371 loff_t i_size = i_size_read(inode);
1372 loff_t endoff = aio_req->iocb->ki_pos + rc;
1373 if (endoff < i_size)
1374 zlen = min_t(size_t, zlen,
1375 i_size - endoff);
1376 aio_req->total_len = rc + zlen;
1377 }
1378
1379 iov_iter_bvec(&i, ITER_DEST, osd_data->bvec_pos.bvecs,
1380 osd_data->num_bvecs, len);
1381 iov_iter_advance(&i, rc);
1382 iov_iter_zero(zlen, &i);
1383 }
1384 }
1385
1386 /* r_start_latency == 0 means the request was not submitted */
1387 if (req->r_start_latency) {
1388 if (aio_req->write)
1389 ceph_update_write_metrics(metric, req->r_start_latency,
1390 req->r_end_latency, len, rc);
1391 else
1392 ceph_update_read_metrics(metric, req->r_start_latency,
1393 req->r_end_latency, len, rc);
1394 }
1395
1396 put_bvecs(osd_data->bvec_pos.bvecs, osd_data->num_bvecs,
1397 aio_req->should_dirty);
1398 ceph_osdc_put_request(req);
1399
1400 if (rc < 0)
1401 cmpxchg(&aio_req->error, 0, rc);
1402
1403 ceph_aio_complete(inode, aio_req);
1404 return;
1405 }
1406
ceph_aio_retry_work(struct work_struct * work)1407 static void ceph_aio_retry_work(struct work_struct *work)
1408 {
1409 struct ceph_aio_work *aio_work =
1410 container_of(work, struct ceph_aio_work, work);
1411 struct ceph_osd_request *orig_req = aio_work->req;
1412 struct ceph_aio_request *aio_req = orig_req->r_priv;
1413 struct inode *inode = orig_req->r_inode;
1414 struct ceph_inode_info *ci = ceph_inode(inode);
1415 struct ceph_snap_context *snapc;
1416 struct ceph_osd_request *req;
1417 int ret;
1418
1419 spin_lock(&ci->i_ceph_lock);
1420 if (__ceph_have_pending_cap_snap(ci)) {
1421 struct ceph_cap_snap *capsnap =
1422 list_last_entry(&ci->i_cap_snaps,
1423 struct ceph_cap_snap,
1424 ci_item);
1425 snapc = ceph_get_snap_context(capsnap->context);
1426 } else {
1427 BUG_ON(!ci->i_head_snapc);
1428 snapc = ceph_get_snap_context(ci->i_head_snapc);
1429 }
1430 spin_unlock(&ci->i_ceph_lock);
1431
1432 req = ceph_osdc_alloc_request(orig_req->r_osdc, snapc, 1,
1433 false, GFP_NOFS);
1434 if (!req) {
1435 ret = -ENOMEM;
1436 req = orig_req;
1437 goto out;
1438 }
1439
1440 req->r_flags = /* CEPH_OSD_FLAG_ORDERSNAP | */ CEPH_OSD_FLAG_WRITE;
1441 ceph_oloc_copy(&req->r_base_oloc, &orig_req->r_base_oloc);
1442 ceph_oid_copy(&req->r_base_oid, &orig_req->r_base_oid);
1443
1444 req->r_ops[0] = orig_req->r_ops[0];
1445
1446 req->r_mtime = aio_req->mtime;
1447 req->r_data_offset = req->r_ops[0].extent.offset;
1448
1449 ret = ceph_osdc_alloc_messages(req, GFP_NOFS);
1450 if (ret) {
1451 ceph_osdc_put_request(req);
1452 req = orig_req;
1453 goto out;
1454 }
1455
1456 ceph_osdc_put_request(orig_req);
1457
1458 req->r_callback = ceph_aio_complete_req;
1459 req->r_inode = inode;
1460 req->r_priv = aio_req;
1461
1462 ceph_osdc_start_request(req->r_osdc, req);
1463 out:
1464 if (ret < 0) {
1465 req->r_result = ret;
1466 ceph_aio_complete_req(req);
1467 }
1468
1469 ceph_put_snap_context(snapc);
1470 kfree(aio_work);
1471 }
1472
1473 static ssize_t
ceph_direct_read_write(struct kiocb * iocb,struct iov_iter * iter,struct ceph_snap_context * snapc,struct ceph_cap_flush ** pcf)1474 ceph_direct_read_write(struct kiocb *iocb, struct iov_iter *iter,
1475 struct ceph_snap_context *snapc,
1476 struct ceph_cap_flush **pcf)
1477 {
1478 struct file *file = iocb->ki_filp;
1479 struct inode *inode = file_inode(file);
1480 struct ceph_inode_info *ci = ceph_inode(inode);
1481 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
1482 struct ceph_client *cl = fsc->client;
1483 struct ceph_client_metric *metric = &fsc->mdsc->metric;
1484 struct ceph_vino vino;
1485 struct ceph_osd_request *req;
1486 struct bio_vec *bvecs;
1487 struct ceph_aio_request *aio_req = NULL;
1488 int num_pages = 0;
1489 int flags;
1490 int ret = 0;
1491 struct timespec64 mtime = current_time(inode);
1492 size_t count = iov_iter_count(iter);
1493 loff_t pos = iocb->ki_pos;
1494 bool write = iov_iter_rw(iter) == WRITE;
1495 bool should_dirty = !write && user_backed_iter(iter);
1496 bool sparse = ceph_test_mount_opt(fsc, SPARSEREAD);
1497
1498 if (write && ceph_snap(file_inode(file)) != CEPH_NOSNAP)
1499 return -EROFS;
1500
1501 doutc(cl, "sync_direct_%s on file %p %lld~%u snapc %p seq %lld\n",
1502 (write ? "write" : "read"), file, pos, (unsigned)count,
1503 snapc, snapc ? snapc->seq : 0);
1504
1505 if (write) {
1506 int ret2;
1507
1508 ceph_fscache_invalidate(inode, true);
1509
1510 ret2 = invalidate_inode_pages2_range(inode->i_mapping,
1511 pos >> PAGE_SHIFT,
1512 (pos + count - 1) >> PAGE_SHIFT);
1513 if (ret2 < 0)
1514 doutc(cl, "invalidate_inode_pages2_range returned %d\n",
1515 ret2);
1516
1517 flags = /* CEPH_OSD_FLAG_ORDERSNAP | */ CEPH_OSD_FLAG_WRITE;
1518 } else {
1519 flags = CEPH_OSD_FLAG_READ;
1520 }
1521
1522 while (iov_iter_count(iter) > 0) {
1523 u64 size = iov_iter_count(iter);
1524 ssize_t len;
1525 struct ceph_osd_req_op *op;
1526 int readop = sparse ? CEPH_OSD_OP_SPARSE_READ : CEPH_OSD_OP_READ;
1527 int extent_cnt;
1528
1529 if (write)
1530 size = min_t(u64, size, fsc->mount_options->wsize);
1531 else
1532 size = min_t(u64, size, fsc->mount_options->rsize);
1533
1534 vino = ceph_vino(inode);
1535 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1536 vino, pos, &size, 0,
1537 1,
1538 write ? CEPH_OSD_OP_WRITE : readop,
1539 flags, snapc,
1540 ci->i_truncate_seq,
1541 ci->i_truncate_size,
1542 false);
1543 if (IS_ERR(req)) {
1544 ret = PTR_ERR(req);
1545 break;
1546 }
1547
1548 op = &req->r_ops[0];
1549 if (!write && sparse) {
1550 extent_cnt = __ceph_sparse_read_ext_count(inode, size);
1551 ret = ceph_alloc_sparse_ext_map(op, extent_cnt);
1552 if (ret) {
1553 ceph_osdc_put_request(req);
1554 break;
1555 }
1556 }
1557
1558 len = iter_get_bvecs_alloc(iter, size, &bvecs, &num_pages);
1559 if (len < 0) {
1560 ceph_osdc_put_request(req);
1561 ret = len;
1562 break;
1563 }
1564 if (len != size)
1565 osd_req_op_extent_update(req, 0, len);
1566
1567 osd_req_op_extent_osd_data_bvecs(req, 0, bvecs, num_pages, len);
1568
1569 /*
1570 * To simplify error handling, allow AIO when IO within i_size
1571 * or IO can be satisfied by single OSD request.
1572 */
1573 if (pos == iocb->ki_pos && !is_sync_kiocb(iocb) &&
1574 (len == count || pos + count <= i_size_read(inode))) {
1575 aio_req = kzalloc(sizeof(*aio_req), GFP_KERNEL);
1576 if (aio_req) {
1577 aio_req->iocb = iocb;
1578 aio_req->write = write;
1579 aio_req->should_dirty = should_dirty;
1580 INIT_LIST_HEAD(&aio_req->osd_reqs);
1581 if (write) {
1582 aio_req->mtime = mtime;
1583 swap(aio_req->prealloc_cf, *pcf);
1584 }
1585 }
1586 /* ignore error */
1587 }
1588
1589 if (write) {
1590 /*
1591 * throw out any page cache pages in this range. this
1592 * may block.
1593 */
1594 truncate_inode_pages_range(inode->i_mapping, pos,
1595 PAGE_ALIGN(pos + len) - 1);
1596
1597 req->r_mtime = mtime;
1598 }
1599
1600 if (aio_req) {
1601 aio_req->total_len += len;
1602 aio_req->num_reqs++;
1603 atomic_inc(&aio_req->pending_reqs);
1604
1605 req->r_callback = ceph_aio_complete_req;
1606 req->r_inode = inode;
1607 req->r_priv = aio_req;
1608 list_add_tail(&req->r_private_item, &aio_req->osd_reqs);
1609
1610 pos += len;
1611 continue;
1612 }
1613
1614 ceph_osdc_start_request(req->r_osdc, req);
1615 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
1616
1617 if (write)
1618 ceph_update_write_metrics(metric, req->r_start_latency,
1619 req->r_end_latency, len, ret);
1620 else
1621 ceph_update_read_metrics(metric, req->r_start_latency,
1622 req->r_end_latency, len, ret);
1623
1624 size = i_size_read(inode);
1625 if (!write) {
1626 if (sparse && ret >= 0)
1627 ret = ceph_sparse_ext_map_end(op);
1628 else if (ret == -ENOENT)
1629 ret = 0;
1630
1631 if (ret >= 0 && ret < len && pos + ret < size) {
1632 struct iov_iter i;
1633 int zlen = min_t(size_t, len - ret,
1634 size - pos - ret);
1635
1636 iov_iter_bvec(&i, ITER_DEST, bvecs, num_pages, len);
1637 iov_iter_advance(&i, ret);
1638 iov_iter_zero(zlen, &i);
1639 ret += zlen;
1640 }
1641 if (ret >= 0)
1642 len = ret;
1643 }
1644
1645 put_bvecs(bvecs, num_pages, should_dirty);
1646 ceph_osdc_put_request(req);
1647 if (ret < 0)
1648 break;
1649
1650 pos += len;
1651 if (!write && pos >= size)
1652 break;
1653
1654 if (write && pos > size) {
1655 if (ceph_inode_set_size(inode, pos))
1656 ceph_check_caps(ceph_inode(inode),
1657 CHECK_CAPS_AUTHONLY);
1658 }
1659 }
1660
1661 if (aio_req) {
1662 LIST_HEAD(osd_reqs);
1663
1664 if (aio_req->num_reqs == 0) {
1665 kfree(aio_req);
1666 return ret;
1667 }
1668
1669 ceph_get_cap_refs(ci, write ? CEPH_CAP_FILE_WR :
1670 CEPH_CAP_FILE_RD);
1671
1672 list_splice(&aio_req->osd_reqs, &osd_reqs);
1673 inode_dio_begin(inode);
1674 while (!list_empty(&osd_reqs)) {
1675 req = list_first_entry(&osd_reqs,
1676 struct ceph_osd_request,
1677 r_private_item);
1678 list_del_init(&req->r_private_item);
1679 if (ret >= 0)
1680 ceph_osdc_start_request(req->r_osdc, req);
1681 if (ret < 0) {
1682 req->r_result = ret;
1683 ceph_aio_complete_req(req);
1684 }
1685 }
1686 return -EIOCBQUEUED;
1687 }
1688
1689 if (ret != -EOLDSNAPC && pos > iocb->ki_pos) {
1690 ret = pos - iocb->ki_pos;
1691 iocb->ki_pos = pos;
1692 }
1693 return ret;
1694 }
1695
1696 /*
1697 * Synchronous write, straight from __user pointer or user pages.
1698 *
1699 * If write spans object boundary, just do multiple writes. (For a
1700 * correct atomic write, we should e.g. take write locks on all
1701 * objects, rollback on failure, etc.)
1702 */
1703 static ssize_t
ceph_sync_write(struct kiocb * iocb,struct iov_iter * from,loff_t pos,struct ceph_snap_context * snapc)1704 ceph_sync_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos,
1705 struct ceph_snap_context *snapc)
1706 {
1707 struct file *file = iocb->ki_filp;
1708 struct inode *inode = file_inode(file);
1709 struct ceph_inode_info *ci = ceph_inode(inode);
1710 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
1711 struct ceph_client *cl = fsc->client;
1712 struct ceph_osd_client *osdc = &fsc->client->osdc;
1713 struct ceph_osd_request *req;
1714 struct page **pages;
1715 u64 len;
1716 int num_pages;
1717 int written = 0;
1718 int ret;
1719 bool check_caps = false;
1720 struct timespec64 mtime = current_time(inode);
1721 size_t count = iov_iter_count(from);
1722
1723 if (ceph_snap(file_inode(file)) != CEPH_NOSNAP)
1724 return -EROFS;
1725
1726 doutc(cl, "on file %p %lld~%u snapc %p seq %lld\n", file, pos,
1727 (unsigned)count, snapc, snapc->seq);
1728
1729 ret = filemap_write_and_wait_range(inode->i_mapping,
1730 pos, pos + count - 1);
1731 if (ret < 0)
1732 return ret;
1733
1734 ceph_fscache_invalidate(inode, false);
1735
1736 while ((len = iov_iter_count(from)) > 0) {
1737 size_t left;
1738 int n;
1739 u64 write_pos = pos;
1740 u64 write_len = len;
1741 u64 objnum, objoff;
1742 u32 xlen;
1743 u64 assert_ver = 0;
1744 bool rmw;
1745 bool first, last;
1746 struct iov_iter saved_iter = *from;
1747 size_t off;
1748
1749 ceph_fscrypt_adjust_off_and_len(inode, &write_pos, &write_len);
1750
1751 /* clamp the length to the end of first object */
1752 ceph_calc_file_object_mapping(&ci->i_layout, write_pos,
1753 write_len, &objnum, &objoff,
1754 &xlen);
1755 write_len = xlen;
1756
1757 /* adjust len downward if it goes beyond current object */
1758 if (pos + len > write_pos + write_len)
1759 len = write_pos + write_len - pos;
1760
1761 /*
1762 * If we had to adjust the length or position to align with a
1763 * crypto block, then we must do a read/modify/write cycle. We
1764 * use a version assertion to redrive the thing if something
1765 * changes in between.
1766 */
1767 first = pos != write_pos;
1768 last = (pos + len) != (write_pos + write_len);
1769 rmw = first || last;
1770
1771 doutc(cl, "ino %llx %lld~%llu adjusted %lld~%llu -- %srmw\n",
1772 ci->i_vino.ino, pos, len, write_pos, write_len,
1773 rmw ? "" : "no ");
1774
1775 /*
1776 * The data is emplaced into the page as it would be if it were
1777 * in an array of pagecache pages.
1778 */
1779 num_pages = calc_pages_for(write_pos, write_len);
1780 pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL);
1781 if (IS_ERR(pages)) {
1782 ret = PTR_ERR(pages);
1783 break;
1784 }
1785
1786 /* Do we need to preload the pages? */
1787 if (rmw) {
1788 u64 first_pos = write_pos;
1789 u64 last_pos = (write_pos + write_len) - CEPH_FSCRYPT_BLOCK_SIZE;
1790 u64 read_len = CEPH_FSCRYPT_BLOCK_SIZE;
1791 struct ceph_osd_req_op *op;
1792
1793 /* We should only need to do this for encrypted inodes */
1794 WARN_ON_ONCE(!IS_ENCRYPTED(inode));
1795
1796 /* No need to do two reads if first and last blocks are same */
1797 if (first && last_pos == first_pos)
1798 last = false;
1799
1800 /*
1801 * Allocate a read request for one or two extents,
1802 * depending on how the request was aligned.
1803 */
1804 req = ceph_osdc_new_request(osdc, &ci->i_layout,
1805 ci->i_vino, first ? first_pos : last_pos,
1806 &read_len, 0, (first && last) ? 2 : 1,
1807 CEPH_OSD_OP_SPARSE_READ, CEPH_OSD_FLAG_READ,
1808 NULL, ci->i_truncate_seq,
1809 ci->i_truncate_size, false);
1810 if (IS_ERR(req)) {
1811 ceph_release_page_vector(pages, num_pages);
1812 ret = PTR_ERR(req);
1813 break;
1814 }
1815
1816 /* Something is misaligned! */
1817 if (read_len != CEPH_FSCRYPT_BLOCK_SIZE) {
1818 ceph_osdc_put_request(req);
1819 ceph_release_page_vector(pages, num_pages);
1820 ret = -EIO;
1821 break;
1822 }
1823
1824 /* Add extent for first block? */
1825 op = &req->r_ops[0];
1826
1827 if (first) {
1828 osd_req_op_extent_osd_data_pages(req, 0, pages,
1829 CEPH_FSCRYPT_BLOCK_SIZE,
1830 offset_in_page(first_pos),
1831 false, false);
1832 /* We only expect a single extent here */
1833 ret = __ceph_alloc_sparse_ext_map(op, 1);
1834 if (ret) {
1835 ceph_osdc_put_request(req);
1836 ceph_release_page_vector(pages, num_pages);
1837 break;
1838 }
1839 }
1840
1841 /* Add extent for last block */
1842 if (last) {
1843 /* Init the other extent if first extent has been used */
1844 if (first) {
1845 op = &req->r_ops[1];
1846 osd_req_op_extent_init(req, 1,
1847 CEPH_OSD_OP_SPARSE_READ,
1848 last_pos, CEPH_FSCRYPT_BLOCK_SIZE,
1849 ci->i_truncate_size,
1850 ci->i_truncate_seq);
1851 }
1852
1853 ret = __ceph_alloc_sparse_ext_map(op, 1);
1854 if (ret) {
1855 ceph_osdc_put_request(req);
1856 ceph_release_page_vector(pages, num_pages);
1857 break;
1858 }
1859
1860 osd_req_op_extent_osd_data_pages(req, first ? 1 : 0,
1861 &pages[num_pages - 1],
1862 CEPH_FSCRYPT_BLOCK_SIZE,
1863 offset_in_page(last_pos),
1864 false, false);
1865 }
1866
1867 ceph_osdc_start_request(osdc, req);
1868 ret = ceph_osdc_wait_request(osdc, req);
1869
1870 /* FIXME: length field is wrong if there are 2 extents */
1871 ceph_update_read_metrics(&fsc->mdsc->metric,
1872 req->r_start_latency,
1873 req->r_end_latency,
1874 read_len, ret);
1875
1876 /* Ok if object is not already present */
1877 if (ret == -ENOENT) {
1878 /*
1879 * If there is no object, then we can't assert
1880 * on its version. Set it to 0, and we'll use an
1881 * exclusive create instead.
1882 */
1883 ceph_osdc_put_request(req);
1884 ret = 0;
1885
1886 /*
1887 * zero out the soon-to-be uncopied parts of the
1888 * first and last pages.
1889 */
1890 if (first)
1891 zero_user_segment(pages[0], 0,
1892 offset_in_page(first_pos));
1893 if (last)
1894 zero_user_segment(pages[num_pages - 1],
1895 offset_in_page(last_pos),
1896 PAGE_SIZE);
1897 } else {
1898 if (ret < 0) {
1899 ceph_osdc_put_request(req);
1900 ceph_release_page_vector(pages, num_pages);
1901 break;
1902 }
1903
1904 op = &req->r_ops[0];
1905 if (op->extent.sparse_ext_cnt == 0) {
1906 if (first)
1907 zero_user_segment(pages[0], 0,
1908 offset_in_page(first_pos));
1909 else
1910 zero_user_segment(pages[num_pages - 1],
1911 offset_in_page(last_pos),
1912 PAGE_SIZE);
1913 } else if (op->extent.sparse_ext_cnt != 1 ||
1914 ceph_sparse_ext_map_end(op) !=
1915 CEPH_FSCRYPT_BLOCK_SIZE) {
1916 ret = -EIO;
1917 ceph_osdc_put_request(req);
1918 ceph_release_page_vector(pages, num_pages);
1919 break;
1920 }
1921
1922 if (first && last) {
1923 op = &req->r_ops[1];
1924 if (op->extent.sparse_ext_cnt == 0) {
1925 zero_user_segment(pages[num_pages - 1],
1926 offset_in_page(last_pos),
1927 PAGE_SIZE);
1928 } else if (op->extent.sparse_ext_cnt != 1 ||
1929 ceph_sparse_ext_map_end(op) !=
1930 CEPH_FSCRYPT_BLOCK_SIZE) {
1931 ret = -EIO;
1932 ceph_osdc_put_request(req);
1933 ceph_release_page_vector(pages, num_pages);
1934 break;
1935 }
1936 }
1937
1938 /* Grab assert version. It must be non-zero. */
1939 assert_ver = req->r_version;
1940 WARN_ON_ONCE(ret > 0 && assert_ver == 0);
1941
1942 ceph_osdc_put_request(req);
1943 if (first) {
1944 ret = ceph_fscrypt_decrypt_block_inplace(inode,
1945 pages[0], CEPH_FSCRYPT_BLOCK_SIZE,
1946 offset_in_page(first_pos),
1947 first_pos >> CEPH_FSCRYPT_BLOCK_SHIFT);
1948 if (ret < 0) {
1949 ceph_release_page_vector(pages, num_pages);
1950 break;
1951 }
1952 }
1953 if (last) {
1954 ret = ceph_fscrypt_decrypt_block_inplace(inode,
1955 pages[num_pages - 1],
1956 CEPH_FSCRYPT_BLOCK_SIZE,
1957 offset_in_page(last_pos),
1958 last_pos >> CEPH_FSCRYPT_BLOCK_SHIFT);
1959 if (ret < 0) {
1960 ceph_release_page_vector(pages, num_pages);
1961 break;
1962 }
1963 }
1964 }
1965 }
1966
1967 left = len;
1968 off = offset_in_page(pos);
1969 for (n = 0; n < num_pages; n++) {
1970 size_t plen = min_t(size_t, left, PAGE_SIZE - off);
1971
1972 /* copy the data */
1973 ret = copy_page_from_iter(pages[n], off, plen, from);
1974 if (ret != plen) {
1975 ret = -EFAULT;
1976 break;
1977 }
1978 off = 0;
1979 left -= ret;
1980 }
1981 if (ret < 0) {
1982 doutc(cl, "write failed with %d\n", ret);
1983 ceph_release_page_vector(pages, num_pages);
1984 break;
1985 }
1986
1987 if (IS_ENCRYPTED(inode)) {
1988 ret = ceph_fscrypt_encrypt_pages(inode, pages,
1989 write_pos, write_len);
1990 if (ret < 0) {
1991 doutc(cl, "encryption failed with %d\n", ret);
1992 ceph_release_page_vector(pages, num_pages);
1993 break;
1994 }
1995 }
1996
1997 req = ceph_osdc_new_request(osdc, &ci->i_layout,
1998 ci->i_vino, write_pos, &write_len,
1999 rmw ? 1 : 0, rmw ? 2 : 1,
2000 CEPH_OSD_OP_WRITE,
2001 CEPH_OSD_FLAG_WRITE,
2002 snapc, ci->i_truncate_seq,
2003 ci->i_truncate_size, false);
2004 if (IS_ERR(req)) {
2005 ret = PTR_ERR(req);
2006 ceph_release_page_vector(pages, num_pages);
2007 break;
2008 }
2009
2010 doutc(cl, "write op %lld~%llu\n", write_pos, write_len);
2011 osd_req_op_extent_osd_data_pages(req, rmw ? 1 : 0, pages, write_len,
2012 offset_in_page(write_pos), false,
2013 true);
2014 req->r_inode = inode;
2015 req->r_mtime = mtime;
2016
2017 /* Set up the assertion */
2018 if (rmw) {
2019 /*
2020 * Set up the assertion. If we don't have a version
2021 * number, then the object doesn't exist yet. Use an
2022 * exclusive create instead of a version assertion in
2023 * that case.
2024 */
2025 if (assert_ver) {
2026 osd_req_op_init(req, 0, CEPH_OSD_OP_ASSERT_VER, 0);
2027 req->r_ops[0].assert_ver.ver = assert_ver;
2028 } else {
2029 osd_req_op_init(req, 0, CEPH_OSD_OP_CREATE,
2030 CEPH_OSD_OP_FLAG_EXCL);
2031 }
2032 }
2033
2034 ceph_osdc_start_request(osdc, req);
2035 ret = ceph_osdc_wait_request(osdc, req);
2036
2037 ceph_update_write_metrics(&fsc->mdsc->metric, req->r_start_latency,
2038 req->r_end_latency, len, ret);
2039 ceph_osdc_put_request(req);
2040 if (ret != 0) {
2041 doutc(cl, "osd write returned %d\n", ret);
2042 /* Version changed! Must re-do the rmw cycle */
2043 if ((assert_ver && (ret == -ERANGE || ret == -EOVERFLOW)) ||
2044 (!assert_ver && ret == -EEXIST)) {
2045 /* We should only ever see this on a rmw */
2046 WARN_ON_ONCE(!rmw);
2047
2048 /* The version should never go backward */
2049 WARN_ON_ONCE(ret == -EOVERFLOW);
2050
2051 *from = saved_iter;
2052
2053 /* FIXME: limit number of times we loop? */
2054 continue;
2055 }
2056 ceph_set_error_write(ci);
2057 break;
2058 }
2059
2060 ceph_clear_error_write(ci);
2061
2062 /*
2063 * We successfully wrote to a range of the file. Declare
2064 * that region of the pagecache invalid.
2065 */
2066 ret = invalidate_inode_pages2_range(
2067 inode->i_mapping,
2068 pos >> PAGE_SHIFT,
2069 (pos + len - 1) >> PAGE_SHIFT);
2070 if (ret < 0) {
2071 doutc(cl, "invalidate_inode_pages2_range returned %d\n",
2072 ret);
2073 ret = 0;
2074 }
2075 pos += len;
2076 written += len;
2077 doutc(cl, "written %d\n", written);
2078 if (pos > i_size_read(inode)) {
2079 check_caps = ceph_inode_set_size(inode, pos);
2080 if (check_caps)
2081 ceph_check_caps(ceph_inode(inode),
2082 CHECK_CAPS_AUTHONLY);
2083 }
2084
2085 }
2086
2087 if (ret != -EOLDSNAPC && written > 0) {
2088 ret = written;
2089 iocb->ki_pos = pos;
2090 }
2091 doutc(cl, "returning %d\n", ret);
2092 return ret;
2093 }
2094
2095 /*
2096 * Wrap generic_file_aio_read with checks for cap bits on the inode.
2097 * Atomically grab references, so that those bits are not released
2098 * back to the MDS mid-read.
2099 *
2100 * Hmm, the sync read case isn't actually async... should it be?
2101 */
ceph_read_iter(struct kiocb * iocb,struct iov_iter * to)2102 static ssize_t ceph_read_iter(struct kiocb *iocb, struct iov_iter *to)
2103 {
2104 struct file *filp = iocb->ki_filp;
2105 struct ceph_file_info *fi = filp->private_data;
2106 size_t len = iov_iter_count(to);
2107 struct inode *inode = file_inode(filp);
2108 struct ceph_inode_info *ci = ceph_inode(inode);
2109 bool direct_lock = iocb->ki_flags & IOCB_DIRECT;
2110 struct ceph_client *cl = ceph_inode_to_client(inode);
2111 ssize_t ret;
2112 int want = 0, got = 0;
2113 int retry_op = 0, read = 0;
2114
2115 again:
2116 doutc(cl, "%llu~%u trying to get caps on %p %llx.%llx\n",
2117 iocb->ki_pos, (unsigned)len, inode, ceph_vinop(inode));
2118
2119 if (ceph_inode_is_shutdown(inode))
2120 return -ESTALE;
2121
2122 ret = direct_lock ? ceph_start_io_direct(inode) :
2123 ceph_start_io_read(inode);
2124 if (ret)
2125 return ret;
2126
2127 if (!(fi->flags & CEPH_F_SYNC) && !direct_lock)
2128 want |= CEPH_CAP_FILE_CACHE;
2129 if (fi->fmode & CEPH_FILE_MODE_LAZY)
2130 want |= CEPH_CAP_FILE_LAZYIO;
2131
2132 ret = ceph_get_caps(filp, CEPH_CAP_FILE_RD, want, -1, &got);
2133 if (ret < 0) {
2134 if (direct_lock)
2135 ceph_end_io_direct(inode);
2136 else
2137 ceph_end_io_read(inode);
2138 return ret;
2139 }
2140
2141 if ((got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0 ||
2142 (iocb->ki_flags & IOCB_DIRECT) ||
2143 (fi->flags & CEPH_F_SYNC)) {
2144
2145 doutc(cl, "sync %p %llx.%llx %llu~%u got cap refs on %s\n",
2146 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
2147 ceph_cap_string(got));
2148
2149 if (!ceph_has_inline_data(ci)) {
2150 if (!retry_op &&
2151 (iocb->ki_flags & IOCB_DIRECT) &&
2152 !IS_ENCRYPTED(inode)) {
2153 ret = ceph_direct_read_write(iocb, to,
2154 NULL, NULL);
2155 if (ret >= 0 && ret < len)
2156 retry_op = CHECK_EOF;
2157 } else {
2158 ret = ceph_sync_read(iocb, to, &retry_op);
2159 }
2160 } else {
2161 retry_op = READ_INLINE;
2162 }
2163 } else {
2164 CEPH_DEFINE_RW_CONTEXT(rw_ctx, got);
2165 doutc(cl, "async %p %llx.%llx %llu~%u got cap refs on %s\n",
2166 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
2167 ceph_cap_string(got));
2168 ceph_add_rw_context(fi, &rw_ctx);
2169 ret = generic_file_read_iter(iocb, to);
2170 ceph_del_rw_context(fi, &rw_ctx);
2171 }
2172
2173 doutc(cl, "%p %llx.%llx dropping cap refs on %s = %d\n",
2174 inode, ceph_vinop(inode), ceph_cap_string(got), (int)ret);
2175 ceph_put_cap_refs(ci, got);
2176
2177 if (direct_lock)
2178 ceph_end_io_direct(inode);
2179 else
2180 ceph_end_io_read(inode);
2181
2182 if (retry_op > HAVE_RETRIED && ret >= 0) {
2183 int statret;
2184 struct page *page = NULL;
2185 loff_t i_size;
2186 int mask = CEPH_STAT_CAP_SIZE;
2187 if (retry_op == READ_INLINE) {
2188 page = __page_cache_alloc(GFP_KERNEL);
2189 if (!page)
2190 return -ENOMEM;
2191
2192 mask = CEPH_STAT_CAP_INLINE_DATA;
2193 }
2194
2195 statret = __ceph_do_getattr(inode, page, mask, !!page);
2196 if (statret < 0) {
2197 if (page)
2198 __free_page(page);
2199 if (statret == -ENODATA) {
2200 BUG_ON(retry_op != READ_INLINE);
2201 goto again;
2202 }
2203 return statret;
2204 }
2205
2206 i_size = i_size_read(inode);
2207 if (retry_op == READ_INLINE) {
2208 BUG_ON(ret > 0 || read > 0);
2209 if (iocb->ki_pos < i_size &&
2210 iocb->ki_pos < PAGE_SIZE) {
2211 loff_t end = min_t(loff_t, i_size,
2212 iocb->ki_pos + len);
2213 end = min_t(loff_t, end, PAGE_SIZE);
2214 if (statret < end)
2215 zero_user_segment(page, statret, end);
2216 ret = copy_page_to_iter(page,
2217 iocb->ki_pos & ~PAGE_MASK,
2218 end - iocb->ki_pos, to);
2219 iocb->ki_pos += ret;
2220 read += ret;
2221 }
2222 if (iocb->ki_pos < i_size && read < len) {
2223 size_t zlen = min_t(size_t, len - read,
2224 i_size - iocb->ki_pos);
2225 ret = iov_iter_zero(zlen, to);
2226 iocb->ki_pos += ret;
2227 read += ret;
2228 }
2229 __free_pages(page, 0);
2230 return read;
2231 }
2232
2233 /* hit EOF or hole? */
2234 if (retry_op == CHECK_EOF && iocb->ki_pos < i_size &&
2235 ret < len) {
2236 doutc(cl, "may hit hole, ppos %lld < size %lld, reading more\n",
2237 iocb->ki_pos, i_size);
2238
2239 read += ret;
2240 len -= ret;
2241 retry_op = HAVE_RETRIED;
2242 goto again;
2243 }
2244 }
2245
2246 if (ret >= 0)
2247 ret += read;
2248
2249 return ret;
2250 }
2251
2252 /*
2253 * Wrap filemap_splice_read with checks for cap bits on the inode.
2254 * Atomically grab references, so that those bits are not released
2255 * back to the MDS mid-read.
2256 */
ceph_splice_read(struct file * in,loff_t * ppos,struct pipe_inode_info * pipe,size_t len,unsigned int flags)2257 static ssize_t ceph_splice_read(struct file *in, loff_t *ppos,
2258 struct pipe_inode_info *pipe,
2259 size_t len, unsigned int flags)
2260 {
2261 struct ceph_file_info *fi = in->private_data;
2262 struct inode *inode = file_inode(in);
2263 struct ceph_inode_info *ci = ceph_inode(inode);
2264 ssize_t ret;
2265 int want = 0, got = 0;
2266 CEPH_DEFINE_RW_CONTEXT(rw_ctx, 0);
2267
2268 dout("splice_read %p %llx.%llx %llu~%zu trying to get caps on %p\n",
2269 inode, ceph_vinop(inode), *ppos, len, inode);
2270
2271 if (ceph_inode_is_shutdown(inode))
2272 return -ESTALE;
2273
2274 if (ceph_has_inline_data(ci) ||
2275 (fi->flags & CEPH_F_SYNC))
2276 return copy_splice_read(in, ppos, pipe, len, flags);
2277
2278 ret = ceph_start_io_read(inode);
2279 if (ret)
2280 return ret;
2281
2282 want = CEPH_CAP_FILE_CACHE;
2283 if (fi->fmode & CEPH_FILE_MODE_LAZY)
2284 want |= CEPH_CAP_FILE_LAZYIO;
2285
2286 ret = ceph_get_caps(in, CEPH_CAP_FILE_RD, want, -1, &got);
2287 if (ret < 0)
2288 goto out_end;
2289
2290 if ((got & (CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO)) == 0) {
2291 dout("splice_read/sync %p %llx.%llx %llu~%zu got cap refs on %s\n",
2292 inode, ceph_vinop(inode), *ppos, len,
2293 ceph_cap_string(got));
2294
2295 ceph_put_cap_refs(ci, got);
2296 ceph_end_io_read(inode);
2297 return copy_splice_read(in, ppos, pipe, len, flags);
2298 }
2299
2300 dout("splice_read %p %llx.%llx %llu~%zu got cap refs on %s\n",
2301 inode, ceph_vinop(inode), *ppos, len, ceph_cap_string(got));
2302
2303 rw_ctx.caps = got;
2304 ceph_add_rw_context(fi, &rw_ctx);
2305 ret = filemap_splice_read(in, ppos, pipe, len, flags);
2306 ceph_del_rw_context(fi, &rw_ctx);
2307
2308 dout("splice_read %p %llx.%llx dropping cap refs on %s = %zd\n",
2309 inode, ceph_vinop(inode), ceph_cap_string(got), ret);
2310
2311 ceph_put_cap_refs(ci, got);
2312 out_end:
2313 ceph_end_io_read(inode);
2314 return ret;
2315 }
2316
2317 /*
2318 * Take cap references to avoid releasing caps to MDS mid-write.
2319 *
2320 * If we are synchronous, and write with an old snap context, the OSD
2321 * may return EOLDSNAPC. In that case, retry the write.. _after_
2322 * dropping our cap refs and allowing the pending snap to logically
2323 * complete _before_ this write occurs.
2324 *
2325 * If we are near ENOSPC, write synchronously.
2326 */
ceph_write_iter(struct kiocb * iocb,struct iov_iter * from)2327 static ssize_t ceph_write_iter(struct kiocb *iocb, struct iov_iter *from)
2328 {
2329 struct file *file = iocb->ki_filp;
2330 struct ceph_file_info *fi = file->private_data;
2331 struct inode *inode = file_inode(file);
2332 struct ceph_inode_info *ci = ceph_inode(inode);
2333 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
2334 struct ceph_client *cl = fsc->client;
2335 struct ceph_osd_client *osdc = &fsc->client->osdc;
2336 struct ceph_cap_flush *prealloc_cf;
2337 ssize_t count, written = 0;
2338 int err, want = 0, got;
2339 bool direct_lock = false;
2340 u32 map_flags;
2341 u64 pool_flags;
2342 loff_t pos;
2343 loff_t limit = max(i_size_read(inode), fsc->max_file_size);
2344
2345 if (ceph_inode_is_shutdown(inode))
2346 return -ESTALE;
2347
2348 if (ceph_snap(inode) != CEPH_NOSNAP)
2349 return -EROFS;
2350
2351 prealloc_cf = ceph_alloc_cap_flush();
2352 if (!prealloc_cf)
2353 return -ENOMEM;
2354
2355 if ((iocb->ki_flags & (IOCB_DIRECT | IOCB_APPEND)) == IOCB_DIRECT)
2356 direct_lock = true;
2357
2358 retry_snap:
2359 err = direct_lock ? ceph_start_io_direct(inode) :
2360 ceph_start_io_write(inode);
2361 if (err)
2362 goto out_unlocked;
2363
2364 if (iocb->ki_flags & IOCB_APPEND) {
2365 err = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false);
2366 if (err < 0)
2367 goto out;
2368 }
2369
2370 err = generic_write_checks(iocb, from);
2371 if (err <= 0)
2372 goto out;
2373
2374 pos = iocb->ki_pos;
2375 if (unlikely(pos >= limit)) {
2376 err = -EFBIG;
2377 goto out;
2378 } else {
2379 iov_iter_truncate(from, limit - pos);
2380 }
2381
2382 count = iov_iter_count(from);
2383 if (ceph_quota_is_max_bytes_exceeded(inode, pos + count)) {
2384 err = -EDQUOT;
2385 goto out;
2386 }
2387
2388 down_read(&osdc->lock);
2389 map_flags = osdc->osdmap->flags;
2390 pool_flags = ceph_pg_pool_flags(osdc->osdmap, ci->i_layout.pool_id);
2391 up_read(&osdc->lock);
2392 if ((map_flags & CEPH_OSDMAP_FULL) ||
2393 (pool_flags & CEPH_POOL_FLAG_FULL)) {
2394 err = -ENOSPC;
2395 goto out;
2396 }
2397
2398 err = file_remove_privs(file);
2399 if (err)
2400 goto out;
2401
2402 doutc(cl, "%p %llx.%llx %llu~%zd getting caps. i_size %llu\n",
2403 inode, ceph_vinop(inode), pos, count,
2404 i_size_read(inode));
2405 if (!(fi->flags & CEPH_F_SYNC) && !direct_lock)
2406 want |= CEPH_CAP_FILE_BUFFER;
2407 if (fi->fmode & CEPH_FILE_MODE_LAZY)
2408 want |= CEPH_CAP_FILE_LAZYIO;
2409 got = 0;
2410 err = ceph_get_caps(file, CEPH_CAP_FILE_WR, want, pos + count, &got);
2411 if (err < 0)
2412 goto out;
2413
2414 err = file_update_time(file);
2415 if (err)
2416 goto out_caps;
2417
2418 inode_inc_iversion_raw(inode);
2419
2420 doutc(cl, "%p %llx.%llx %llu~%zd got cap refs on %s\n",
2421 inode, ceph_vinop(inode), pos, count, ceph_cap_string(got));
2422
2423 if ((got & (CEPH_CAP_FILE_BUFFER|CEPH_CAP_FILE_LAZYIO)) == 0 ||
2424 (iocb->ki_flags & IOCB_DIRECT) || (fi->flags & CEPH_F_SYNC) ||
2425 (ci->i_ceph_flags & CEPH_I_ERROR_WRITE)) {
2426 struct ceph_snap_context *snapc;
2427 struct iov_iter data;
2428
2429 spin_lock(&ci->i_ceph_lock);
2430 if (__ceph_have_pending_cap_snap(ci)) {
2431 struct ceph_cap_snap *capsnap =
2432 list_last_entry(&ci->i_cap_snaps,
2433 struct ceph_cap_snap,
2434 ci_item);
2435 snapc = ceph_get_snap_context(capsnap->context);
2436 } else {
2437 BUG_ON(!ci->i_head_snapc);
2438 snapc = ceph_get_snap_context(ci->i_head_snapc);
2439 }
2440 spin_unlock(&ci->i_ceph_lock);
2441
2442 /* we might need to revert back to that point */
2443 data = *from;
2444 if ((iocb->ki_flags & IOCB_DIRECT) && !IS_ENCRYPTED(inode))
2445 written = ceph_direct_read_write(iocb, &data, snapc,
2446 &prealloc_cf);
2447 else
2448 written = ceph_sync_write(iocb, &data, pos, snapc);
2449 if (direct_lock)
2450 ceph_end_io_direct(inode);
2451 else
2452 ceph_end_io_write(inode);
2453 if (written > 0)
2454 iov_iter_advance(from, written);
2455 ceph_put_snap_context(snapc);
2456 } else {
2457 /*
2458 * No need to acquire the i_truncate_mutex. Because
2459 * the MDS revokes Fwb caps before sending truncate
2460 * message to us. We can't get Fwb cap while there
2461 * are pending vmtruncate. So write and vmtruncate
2462 * can not run at the same time
2463 */
2464 written = generic_perform_write(iocb, from);
2465 ceph_end_io_write(inode);
2466 }
2467
2468 if (written >= 0) {
2469 int dirty;
2470
2471 spin_lock(&ci->i_ceph_lock);
2472 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
2473 &prealloc_cf);
2474 spin_unlock(&ci->i_ceph_lock);
2475 if (dirty)
2476 __mark_inode_dirty(inode, dirty);
2477 if (ceph_quota_is_max_bytes_approaching(inode, iocb->ki_pos))
2478 ceph_check_caps(ci, CHECK_CAPS_FLUSH);
2479 }
2480
2481 doutc(cl, "%p %llx.%llx %llu~%u dropping cap refs on %s\n",
2482 inode, ceph_vinop(inode), pos, (unsigned)count,
2483 ceph_cap_string(got));
2484 ceph_put_cap_refs(ci, got);
2485
2486 if (written == -EOLDSNAPC) {
2487 doutc(cl, "%p %llx.%llx %llu~%u" "got EOLDSNAPC, retrying\n",
2488 inode, ceph_vinop(inode), pos, (unsigned)count);
2489 goto retry_snap;
2490 }
2491
2492 if (written >= 0) {
2493 if ((map_flags & CEPH_OSDMAP_NEARFULL) ||
2494 (pool_flags & CEPH_POOL_FLAG_NEARFULL))
2495 iocb->ki_flags |= IOCB_DSYNC;
2496 written = generic_write_sync(iocb, written);
2497 }
2498
2499 goto out_unlocked;
2500 out_caps:
2501 ceph_put_cap_refs(ci, got);
2502 out:
2503 if (direct_lock)
2504 ceph_end_io_direct(inode);
2505 else
2506 ceph_end_io_write(inode);
2507 out_unlocked:
2508 ceph_free_cap_flush(prealloc_cf);
2509 return written ? written : err;
2510 }
2511
2512 /*
2513 * llseek. be sure to verify file size on SEEK_END.
2514 */
ceph_llseek(struct file * file,loff_t offset,int whence)2515 static loff_t ceph_llseek(struct file *file, loff_t offset, int whence)
2516 {
2517 if (whence == SEEK_END || whence == SEEK_DATA || whence == SEEK_HOLE) {
2518 struct inode *inode = file_inode(file);
2519 int ret;
2520
2521 ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false);
2522 if (ret < 0)
2523 return ret;
2524 }
2525 return generic_file_llseek(file, offset, whence);
2526 }
2527
ceph_zero_partial_page(struct inode * inode,loff_t offset,size_t size)2528 static inline void ceph_zero_partial_page(struct inode *inode,
2529 loff_t offset, size_t size)
2530 {
2531 struct folio *folio;
2532
2533 folio = filemap_lock_folio(inode->i_mapping, offset >> PAGE_SHIFT);
2534 if (IS_ERR(folio))
2535 return;
2536
2537 folio_wait_writeback(folio);
2538 folio_zero_range(folio, offset_in_folio(folio, offset), size);
2539 folio_unlock(folio);
2540 folio_put(folio);
2541 }
2542
ceph_zero_pagecache_range(struct inode * inode,loff_t offset,loff_t length)2543 static void ceph_zero_pagecache_range(struct inode *inode, loff_t offset,
2544 loff_t length)
2545 {
2546 loff_t nearly = round_up(offset, PAGE_SIZE);
2547 if (offset < nearly) {
2548 loff_t size = nearly - offset;
2549 if (length < size)
2550 size = length;
2551 ceph_zero_partial_page(inode, offset, size);
2552 offset += size;
2553 length -= size;
2554 }
2555 if (length >= PAGE_SIZE) {
2556 loff_t size = round_down(length, PAGE_SIZE);
2557 truncate_pagecache_range(inode, offset, offset + size - 1);
2558 offset += size;
2559 length -= size;
2560 }
2561 if (length)
2562 ceph_zero_partial_page(inode, offset, length);
2563 }
2564
ceph_zero_partial_object(struct inode * inode,loff_t offset,loff_t * length)2565 static int ceph_zero_partial_object(struct inode *inode,
2566 loff_t offset, loff_t *length)
2567 {
2568 struct ceph_inode_info *ci = ceph_inode(inode);
2569 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
2570 struct ceph_osd_request *req;
2571 int ret = 0;
2572 loff_t zero = 0;
2573 int op;
2574
2575 if (ceph_inode_is_shutdown(inode))
2576 return -EIO;
2577
2578 if (!length) {
2579 op = offset ? CEPH_OSD_OP_DELETE : CEPH_OSD_OP_TRUNCATE;
2580 length = &zero;
2581 } else {
2582 op = CEPH_OSD_OP_ZERO;
2583 }
2584
2585 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
2586 ceph_vino(inode),
2587 offset, length,
2588 0, 1, op,
2589 CEPH_OSD_FLAG_WRITE,
2590 NULL, 0, 0, false);
2591 if (IS_ERR(req)) {
2592 ret = PTR_ERR(req);
2593 goto out;
2594 }
2595
2596 req->r_mtime = inode_get_mtime(inode);
2597 ceph_osdc_start_request(&fsc->client->osdc, req);
2598 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
2599 if (ret == -ENOENT)
2600 ret = 0;
2601 ceph_osdc_put_request(req);
2602
2603 out:
2604 return ret;
2605 }
2606
ceph_zero_objects(struct inode * inode,loff_t offset,loff_t length)2607 static int ceph_zero_objects(struct inode *inode, loff_t offset, loff_t length)
2608 {
2609 int ret = 0;
2610 struct ceph_inode_info *ci = ceph_inode(inode);
2611 s32 stripe_unit = ci->i_layout.stripe_unit;
2612 s32 stripe_count = ci->i_layout.stripe_count;
2613 s32 object_size = ci->i_layout.object_size;
2614 u64 object_set_size = (u64) object_size * stripe_count;
2615 u64 nearly, t;
2616
2617 /* round offset up to next period boundary */
2618 nearly = offset + object_set_size - 1;
2619 t = nearly;
2620 nearly -= do_div(t, object_set_size);
2621
2622 while (length && offset < nearly) {
2623 loff_t size = length;
2624 ret = ceph_zero_partial_object(inode, offset, &size);
2625 if (ret < 0)
2626 return ret;
2627 offset += size;
2628 length -= size;
2629 }
2630 while (length >= object_set_size) {
2631 int i;
2632 loff_t pos = offset;
2633 for (i = 0; i < stripe_count; ++i) {
2634 ret = ceph_zero_partial_object(inode, pos, NULL);
2635 if (ret < 0)
2636 return ret;
2637 pos += stripe_unit;
2638 }
2639 offset += object_set_size;
2640 length -= object_set_size;
2641 }
2642 while (length) {
2643 loff_t size = length;
2644 ret = ceph_zero_partial_object(inode, offset, &size);
2645 if (ret < 0)
2646 return ret;
2647 offset += size;
2648 length -= size;
2649 }
2650 return ret;
2651 }
2652
ceph_fallocate(struct file * file,int mode,loff_t offset,loff_t length)2653 static long ceph_fallocate(struct file *file, int mode,
2654 loff_t offset, loff_t length)
2655 {
2656 struct ceph_file_info *fi = file->private_data;
2657 struct inode *inode = file_inode(file);
2658 struct ceph_inode_info *ci = ceph_inode(inode);
2659 struct ceph_cap_flush *prealloc_cf;
2660 struct ceph_client *cl = ceph_inode_to_client(inode);
2661 int want, got = 0;
2662 int dirty;
2663 int ret = 0;
2664 loff_t endoff = 0;
2665 loff_t size;
2666
2667 doutc(cl, "%p %llx.%llx mode %x, offset %llu length %llu\n",
2668 inode, ceph_vinop(inode), mode, offset, length);
2669
2670 if (mode != (FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
2671 return -EOPNOTSUPP;
2672
2673 if (!S_ISREG(inode->i_mode))
2674 return -EOPNOTSUPP;
2675
2676 if (IS_ENCRYPTED(inode))
2677 return -EOPNOTSUPP;
2678
2679 prealloc_cf = ceph_alloc_cap_flush();
2680 if (!prealloc_cf)
2681 return -ENOMEM;
2682
2683 inode_lock(inode);
2684
2685 if (ceph_snap(inode) != CEPH_NOSNAP) {
2686 ret = -EROFS;
2687 goto unlock;
2688 }
2689
2690 size = i_size_read(inode);
2691
2692 /* Are we punching a hole beyond EOF? */
2693 if (offset >= size)
2694 goto unlock;
2695 if ((offset + length) > size)
2696 length = size - offset;
2697
2698 if (fi->fmode & CEPH_FILE_MODE_LAZY)
2699 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
2700 else
2701 want = CEPH_CAP_FILE_BUFFER;
2702
2703 ret = ceph_get_caps(file, CEPH_CAP_FILE_WR, want, endoff, &got);
2704 if (ret < 0)
2705 goto unlock;
2706
2707 ret = file_modified(file);
2708 if (ret)
2709 goto put_caps;
2710
2711 filemap_invalidate_lock(inode->i_mapping);
2712 ceph_fscache_invalidate(inode, false);
2713 ceph_zero_pagecache_range(inode, offset, length);
2714 ret = ceph_zero_objects(inode, offset, length);
2715
2716 if (!ret) {
2717 spin_lock(&ci->i_ceph_lock);
2718 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
2719 &prealloc_cf);
2720 spin_unlock(&ci->i_ceph_lock);
2721 if (dirty)
2722 __mark_inode_dirty(inode, dirty);
2723 }
2724 filemap_invalidate_unlock(inode->i_mapping);
2725
2726 put_caps:
2727 ceph_put_cap_refs(ci, got);
2728 unlock:
2729 inode_unlock(inode);
2730 ceph_free_cap_flush(prealloc_cf);
2731 return ret;
2732 }
2733
2734 /*
2735 * This function tries to get FILE_WR capabilities for dst_ci and FILE_RD for
2736 * src_ci. Two attempts are made to obtain both caps, and an error is return if
2737 * this fails; zero is returned on success.
2738 */
get_rd_wr_caps(struct file * src_filp,int * src_got,struct file * dst_filp,loff_t dst_endoff,int * dst_got)2739 static int get_rd_wr_caps(struct file *src_filp, int *src_got,
2740 struct file *dst_filp,
2741 loff_t dst_endoff, int *dst_got)
2742 {
2743 int ret = 0;
2744 bool retrying = false;
2745
2746 retry_caps:
2747 ret = ceph_get_caps(dst_filp, CEPH_CAP_FILE_WR, CEPH_CAP_FILE_BUFFER,
2748 dst_endoff, dst_got);
2749 if (ret < 0)
2750 return ret;
2751
2752 /*
2753 * Since we're already holding the FILE_WR capability for the dst file,
2754 * we would risk a deadlock by using ceph_get_caps. Thus, we'll do some
2755 * retry dance instead to try to get both capabilities.
2756 */
2757 ret = ceph_try_get_caps(file_inode(src_filp),
2758 CEPH_CAP_FILE_RD, CEPH_CAP_FILE_SHARED,
2759 false, src_got);
2760 if (ret <= 0) {
2761 /* Start by dropping dst_ci caps and getting src_ci caps */
2762 ceph_put_cap_refs(ceph_inode(file_inode(dst_filp)), *dst_got);
2763 if (retrying) {
2764 if (!ret)
2765 /* ceph_try_get_caps masks EAGAIN */
2766 ret = -EAGAIN;
2767 return ret;
2768 }
2769 ret = ceph_get_caps(src_filp, CEPH_CAP_FILE_RD,
2770 CEPH_CAP_FILE_SHARED, -1, src_got);
2771 if (ret < 0)
2772 return ret;
2773 /*... drop src_ci caps too, and retry */
2774 ceph_put_cap_refs(ceph_inode(file_inode(src_filp)), *src_got);
2775 retrying = true;
2776 goto retry_caps;
2777 }
2778 return ret;
2779 }
2780
put_rd_wr_caps(struct ceph_inode_info * src_ci,int src_got,struct ceph_inode_info * dst_ci,int dst_got)2781 static void put_rd_wr_caps(struct ceph_inode_info *src_ci, int src_got,
2782 struct ceph_inode_info *dst_ci, int dst_got)
2783 {
2784 ceph_put_cap_refs(src_ci, src_got);
2785 ceph_put_cap_refs(dst_ci, dst_got);
2786 }
2787
2788 /*
2789 * This function does several size-related checks, returning an error if:
2790 * - source file is smaller than off+len
2791 * - destination file size is not OK (inode_newsize_ok())
2792 * - max bytes quotas is exceeded
2793 */
is_file_size_ok(struct inode * src_inode,struct inode * dst_inode,loff_t src_off,loff_t dst_off,size_t len)2794 static int is_file_size_ok(struct inode *src_inode, struct inode *dst_inode,
2795 loff_t src_off, loff_t dst_off, size_t len)
2796 {
2797 struct ceph_client *cl = ceph_inode_to_client(src_inode);
2798 loff_t size, endoff;
2799
2800 size = i_size_read(src_inode);
2801 /*
2802 * Don't copy beyond source file EOF. Instead of simply setting length
2803 * to (size - src_off), just drop to VFS default implementation, as the
2804 * local i_size may be stale due to other clients writing to the source
2805 * inode.
2806 */
2807 if (src_off + len > size) {
2808 doutc(cl, "Copy beyond EOF (%llu + %zu > %llu)\n", src_off,
2809 len, size);
2810 return -EOPNOTSUPP;
2811 }
2812 size = i_size_read(dst_inode);
2813
2814 endoff = dst_off + len;
2815 if (inode_newsize_ok(dst_inode, endoff))
2816 return -EOPNOTSUPP;
2817
2818 if (ceph_quota_is_max_bytes_exceeded(dst_inode, endoff))
2819 return -EDQUOT;
2820
2821 return 0;
2822 }
2823
2824 static struct ceph_osd_request *
ceph_alloc_copyfrom_request(struct ceph_osd_client * osdc,u64 src_snapid,struct ceph_object_id * src_oid,struct ceph_object_locator * src_oloc,struct ceph_object_id * dst_oid,struct ceph_object_locator * dst_oloc,u32 truncate_seq,u64 truncate_size)2825 ceph_alloc_copyfrom_request(struct ceph_osd_client *osdc,
2826 u64 src_snapid,
2827 struct ceph_object_id *src_oid,
2828 struct ceph_object_locator *src_oloc,
2829 struct ceph_object_id *dst_oid,
2830 struct ceph_object_locator *dst_oloc,
2831 u32 truncate_seq, u64 truncate_size)
2832 {
2833 struct ceph_osd_request *req;
2834 int ret;
2835 u32 src_fadvise_flags =
2836 CEPH_OSD_OP_FLAG_FADVISE_SEQUENTIAL |
2837 CEPH_OSD_OP_FLAG_FADVISE_NOCACHE;
2838 u32 dst_fadvise_flags =
2839 CEPH_OSD_OP_FLAG_FADVISE_SEQUENTIAL |
2840 CEPH_OSD_OP_FLAG_FADVISE_DONTNEED;
2841
2842 req = ceph_osdc_alloc_request(osdc, NULL, 1, false, GFP_KERNEL);
2843 if (!req)
2844 return ERR_PTR(-ENOMEM);
2845
2846 req->r_flags = CEPH_OSD_FLAG_WRITE;
2847
2848 ceph_oloc_copy(&req->r_t.base_oloc, dst_oloc);
2849 ceph_oid_copy(&req->r_t.base_oid, dst_oid);
2850
2851 ret = osd_req_op_copy_from_init(req, src_snapid, 0,
2852 src_oid, src_oloc,
2853 src_fadvise_flags,
2854 dst_fadvise_flags,
2855 truncate_seq,
2856 truncate_size,
2857 CEPH_OSD_COPY_FROM_FLAG_TRUNCATE_SEQ);
2858 if (ret)
2859 goto out;
2860
2861 ret = ceph_osdc_alloc_messages(req, GFP_KERNEL);
2862 if (ret)
2863 goto out;
2864
2865 return req;
2866
2867 out:
2868 ceph_osdc_put_request(req);
2869 return ERR_PTR(ret);
2870 }
2871
ceph_do_objects_copy(struct ceph_inode_info * src_ci,u64 * src_off,struct ceph_inode_info * dst_ci,u64 * dst_off,struct ceph_fs_client * fsc,size_t len,unsigned int flags)2872 static ssize_t ceph_do_objects_copy(struct ceph_inode_info *src_ci, u64 *src_off,
2873 struct ceph_inode_info *dst_ci, u64 *dst_off,
2874 struct ceph_fs_client *fsc,
2875 size_t len, unsigned int flags)
2876 {
2877 struct ceph_object_locator src_oloc, dst_oloc;
2878 struct ceph_object_id src_oid, dst_oid;
2879 struct ceph_osd_client *osdc;
2880 struct ceph_osd_request *req;
2881 ssize_t bytes = 0;
2882 u64 src_objnum, src_objoff, dst_objnum, dst_objoff;
2883 u32 src_objlen, dst_objlen;
2884 u32 object_size = src_ci->i_layout.object_size;
2885 struct ceph_client *cl = fsc->client;
2886 int ret;
2887
2888 src_oloc.pool = src_ci->i_layout.pool_id;
2889 src_oloc.pool_ns = ceph_try_get_string(src_ci->i_layout.pool_ns);
2890 dst_oloc.pool = dst_ci->i_layout.pool_id;
2891 dst_oloc.pool_ns = ceph_try_get_string(dst_ci->i_layout.pool_ns);
2892 osdc = &fsc->client->osdc;
2893
2894 while (len >= object_size) {
2895 ceph_calc_file_object_mapping(&src_ci->i_layout, *src_off,
2896 object_size, &src_objnum,
2897 &src_objoff, &src_objlen);
2898 ceph_calc_file_object_mapping(&dst_ci->i_layout, *dst_off,
2899 object_size, &dst_objnum,
2900 &dst_objoff, &dst_objlen);
2901 ceph_oid_init(&src_oid);
2902 ceph_oid_printf(&src_oid, "%llx.%08llx",
2903 src_ci->i_vino.ino, src_objnum);
2904 ceph_oid_init(&dst_oid);
2905 ceph_oid_printf(&dst_oid, "%llx.%08llx",
2906 dst_ci->i_vino.ino, dst_objnum);
2907 /* Do an object remote copy */
2908 req = ceph_alloc_copyfrom_request(osdc, src_ci->i_vino.snap,
2909 &src_oid, &src_oloc,
2910 &dst_oid, &dst_oloc,
2911 dst_ci->i_truncate_seq,
2912 dst_ci->i_truncate_size);
2913 if (IS_ERR(req))
2914 ret = PTR_ERR(req);
2915 else {
2916 ceph_osdc_start_request(osdc, req);
2917 ret = ceph_osdc_wait_request(osdc, req);
2918 ceph_update_copyfrom_metrics(&fsc->mdsc->metric,
2919 req->r_start_latency,
2920 req->r_end_latency,
2921 object_size, ret);
2922 ceph_osdc_put_request(req);
2923 }
2924 if (ret) {
2925 if (ret == -EOPNOTSUPP) {
2926 fsc->have_copy_from2 = false;
2927 pr_notice_client(cl,
2928 "OSDs don't support copy-from2; disabling copy offload\n");
2929 }
2930 doutc(cl, "returned %d\n", ret);
2931 if (bytes <= 0)
2932 bytes = ret;
2933 goto out;
2934 }
2935 len -= object_size;
2936 bytes += object_size;
2937 *src_off += object_size;
2938 *dst_off += object_size;
2939 }
2940
2941 out:
2942 ceph_oloc_destroy(&src_oloc);
2943 ceph_oloc_destroy(&dst_oloc);
2944 return bytes;
2945 }
2946
__ceph_copy_file_range(struct file * src_file,loff_t src_off,struct file * dst_file,loff_t dst_off,size_t len,unsigned int flags)2947 static ssize_t __ceph_copy_file_range(struct file *src_file, loff_t src_off,
2948 struct file *dst_file, loff_t dst_off,
2949 size_t len, unsigned int flags)
2950 {
2951 struct inode *src_inode = file_inode(src_file);
2952 struct inode *dst_inode = file_inode(dst_file);
2953 struct ceph_inode_info *src_ci = ceph_inode(src_inode);
2954 struct ceph_inode_info *dst_ci = ceph_inode(dst_inode);
2955 struct ceph_cap_flush *prealloc_cf;
2956 struct ceph_fs_client *src_fsc = ceph_inode_to_fs_client(src_inode);
2957 struct ceph_client *cl = src_fsc->client;
2958 loff_t size;
2959 ssize_t ret = -EIO, bytes;
2960 u64 src_objnum, dst_objnum, src_objoff, dst_objoff;
2961 u32 src_objlen, dst_objlen;
2962 int src_got = 0, dst_got = 0, err, dirty;
2963
2964 if (src_inode->i_sb != dst_inode->i_sb) {
2965 struct ceph_fs_client *dst_fsc = ceph_inode_to_fs_client(dst_inode);
2966
2967 if (ceph_fsid_compare(&src_fsc->client->fsid,
2968 &dst_fsc->client->fsid)) {
2969 dout("Copying files across clusters: src: %pU dst: %pU\n",
2970 &src_fsc->client->fsid, &dst_fsc->client->fsid);
2971 return -EXDEV;
2972 }
2973 }
2974 if (ceph_snap(dst_inode) != CEPH_NOSNAP)
2975 return -EROFS;
2976
2977 /*
2978 * Some of the checks below will return -EOPNOTSUPP, which will force a
2979 * fallback to the default VFS copy_file_range implementation. This is
2980 * desirable in several cases (for ex, the 'len' is smaller than the
2981 * size of the objects, or in cases where that would be more
2982 * efficient).
2983 */
2984
2985 if (ceph_test_mount_opt(src_fsc, NOCOPYFROM))
2986 return -EOPNOTSUPP;
2987
2988 if (!src_fsc->have_copy_from2)
2989 return -EOPNOTSUPP;
2990
2991 /*
2992 * Striped file layouts require that we copy partial objects, but the
2993 * OSD copy-from operation only supports full-object copies. Limit
2994 * this to non-striped file layouts for now.
2995 */
2996 if ((src_ci->i_layout.stripe_unit != dst_ci->i_layout.stripe_unit) ||
2997 (src_ci->i_layout.stripe_count != 1) ||
2998 (dst_ci->i_layout.stripe_count != 1) ||
2999 (src_ci->i_layout.object_size != dst_ci->i_layout.object_size)) {
3000 doutc(cl, "Invalid src/dst files layout\n");
3001 return -EOPNOTSUPP;
3002 }
3003
3004 /* Every encrypted inode gets its own key, so we can't offload them */
3005 if (IS_ENCRYPTED(src_inode) || IS_ENCRYPTED(dst_inode))
3006 return -EOPNOTSUPP;
3007
3008 if (len < src_ci->i_layout.object_size)
3009 return -EOPNOTSUPP; /* no remote copy will be done */
3010
3011 prealloc_cf = ceph_alloc_cap_flush();
3012 if (!prealloc_cf)
3013 return -ENOMEM;
3014
3015 /* Start by sync'ing the source and destination files */
3016 ret = file_write_and_wait_range(src_file, src_off, (src_off + len));
3017 if (ret < 0) {
3018 doutc(cl, "failed to write src file (%zd)\n", ret);
3019 goto out;
3020 }
3021 ret = file_write_and_wait_range(dst_file, dst_off, (dst_off + len));
3022 if (ret < 0) {
3023 doutc(cl, "failed to write dst file (%zd)\n", ret);
3024 goto out;
3025 }
3026
3027 /*
3028 * We need FILE_WR caps for dst_ci and FILE_RD for src_ci as other
3029 * clients may have dirty data in their caches. And OSDs know nothing
3030 * about caps, so they can't safely do the remote object copies.
3031 */
3032 err = get_rd_wr_caps(src_file, &src_got,
3033 dst_file, (dst_off + len), &dst_got);
3034 if (err < 0) {
3035 doutc(cl, "get_rd_wr_caps returned %d\n", err);
3036 ret = -EOPNOTSUPP;
3037 goto out;
3038 }
3039
3040 ret = is_file_size_ok(src_inode, dst_inode, src_off, dst_off, len);
3041 if (ret < 0)
3042 goto out_caps;
3043
3044 /* Drop dst file cached pages */
3045 ceph_fscache_invalidate(dst_inode, false);
3046 ret = invalidate_inode_pages2_range(dst_inode->i_mapping,
3047 dst_off >> PAGE_SHIFT,
3048 (dst_off + len) >> PAGE_SHIFT);
3049 if (ret < 0) {
3050 doutc(cl, "Failed to invalidate inode pages (%zd)\n",
3051 ret);
3052 ret = 0; /* XXX */
3053 }
3054 ceph_calc_file_object_mapping(&src_ci->i_layout, src_off,
3055 src_ci->i_layout.object_size,
3056 &src_objnum, &src_objoff, &src_objlen);
3057 ceph_calc_file_object_mapping(&dst_ci->i_layout, dst_off,
3058 dst_ci->i_layout.object_size,
3059 &dst_objnum, &dst_objoff, &dst_objlen);
3060 /* object-level offsets need to the same */
3061 if (src_objoff != dst_objoff) {
3062 ret = -EOPNOTSUPP;
3063 goto out_caps;
3064 }
3065
3066 /*
3067 * Do a manual copy if the object offset isn't object aligned.
3068 * 'src_objlen' contains the bytes left until the end of the object,
3069 * starting at the src_off
3070 */
3071 if (src_objoff) {
3072 doutc(cl, "Initial partial copy of %u bytes\n", src_objlen);
3073
3074 /*
3075 * we need to temporarily drop all caps as we'll be calling
3076 * {read,write}_iter, which will get caps again.
3077 */
3078 put_rd_wr_caps(src_ci, src_got, dst_ci, dst_got);
3079 ret = splice_file_range(src_file, &src_off, dst_file, &dst_off,
3080 src_objlen);
3081 /* Abort on short copies or on error */
3082 if (ret < (long)src_objlen) {
3083 doutc(cl, "Failed partial copy (%zd)\n", ret);
3084 goto out;
3085 }
3086 len -= ret;
3087 err = get_rd_wr_caps(src_file, &src_got,
3088 dst_file, (dst_off + len), &dst_got);
3089 if (err < 0)
3090 goto out;
3091 err = is_file_size_ok(src_inode, dst_inode,
3092 src_off, dst_off, len);
3093 if (err < 0)
3094 goto out_caps;
3095 }
3096
3097 size = i_size_read(dst_inode);
3098 bytes = ceph_do_objects_copy(src_ci, &src_off, dst_ci, &dst_off,
3099 src_fsc, len, flags);
3100 if (bytes <= 0) {
3101 if (!ret)
3102 ret = bytes;
3103 goto out_caps;
3104 }
3105 doutc(cl, "Copied %zu bytes out of %zu\n", bytes, len);
3106 len -= bytes;
3107 ret += bytes;
3108
3109 file_update_time(dst_file);
3110 inode_inc_iversion_raw(dst_inode);
3111
3112 if (dst_off > size) {
3113 /* Let the MDS know about dst file size change */
3114 if (ceph_inode_set_size(dst_inode, dst_off) ||
3115 ceph_quota_is_max_bytes_approaching(dst_inode, dst_off))
3116 ceph_check_caps(dst_ci, CHECK_CAPS_AUTHONLY | CHECK_CAPS_FLUSH);
3117 }
3118 /* Mark Fw dirty */
3119 spin_lock(&dst_ci->i_ceph_lock);
3120 dirty = __ceph_mark_dirty_caps(dst_ci, CEPH_CAP_FILE_WR, &prealloc_cf);
3121 spin_unlock(&dst_ci->i_ceph_lock);
3122 if (dirty)
3123 __mark_inode_dirty(dst_inode, dirty);
3124
3125 out_caps:
3126 put_rd_wr_caps(src_ci, src_got, dst_ci, dst_got);
3127
3128 /*
3129 * Do the final manual copy if we still have some bytes left, unless
3130 * there were errors in remote object copies (len >= object_size).
3131 */
3132 if (len && (len < src_ci->i_layout.object_size)) {
3133 doutc(cl, "Final partial copy of %zu bytes\n", len);
3134 bytes = splice_file_range(src_file, &src_off, dst_file,
3135 &dst_off, len);
3136 if (bytes > 0)
3137 ret += bytes;
3138 else
3139 doutc(cl, "Failed partial copy (%zd)\n", bytes);
3140 }
3141
3142 out:
3143 ceph_free_cap_flush(prealloc_cf);
3144
3145 return ret;
3146 }
3147
ceph_copy_file_range(struct file * src_file,loff_t src_off,struct file * dst_file,loff_t dst_off,size_t len,unsigned int flags)3148 static ssize_t ceph_copy_file_range(struct file *src_file, loff_t src_off,
3149 struct file *dst_file, loff_t dst_off,
3150 size_t len, unsigned int flags)
3151 {
3152 ssize_t ret;
3153
3154 ret = __ceph_copy_file_range(src_file, src_off, dst_file, dst_off,
3155 len, flags);
3156
3157 if (ret == -EOPNOTSUPP || ret == -EXDEV)
3158 ret = splice_copy_file_range(src_file, src_off, dst_file,
3159 dst_off, len);
3160 return ret;
3161 }
3162
3163 const struct file_operations ceph_file_fops = {
3164 .open = ceph_open,
3165 .release = ceph_release,
3166 .llseek = ceph_llseek,
3167 .read_iter = ceph_read_iter,
3168 .write_iter = ceph_write_iter,
3169 .mmap_prepare = ceph_mmap_prepare,
3170 .fsync = ceph_fsync,
3171 .lock = ceph_lock,
3172 .setlease = simple_nosetlease,
3173 .flock = ceph_flock,
3174 .splice_read = ceph_splice_read,
3175 .splice_write = iter_file_splice_write,
3176 .unlocked_ioctl = ceph_ioctl,
3177 .compat_ioctl = compat_ptr_ioctl,
3178 .fallocate = ceph_fallocate,
3179 .copy_file_range = ceph_copy_file_range,
3180 };
3181