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Merge tag 'fs.setgid.v6.0' of git://git.kernel.org/pub/scm/linux/kernel/git/brauner...
[mirror_ubuntu-kernels.git] / fs / ceph / file.c
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
16 #include "super.h"
17 #include "mds_client.h"
18 #include "cache.h"
19 #include "io.h"
20 #include "metric.h"
21
22 static __le32 ceph_flags_sys2wire(u32 flags)
23 {
24 u32 wire_flags = 0;
25
26 switch (flags & O_ACCMODE) {
27 case O_RDONLY:
28 wire_flags |= CEPH_O_RDONLY;
29 break;
30 case O_WRONLY:
31 wire_flags |= CEPH_O_WRONLY;
32 break;
33 case O_RDWR:
34 wire_flags |= CEPH_O_RDWR;
35 break;
36 }
37
38 flags &= ~O_ACCMODE;
39
40 #define ceph_sys2wire(a) if (flags & a) { wire_flags |= CEPH_##a; flags &= ~a; }
41
42 ceph_sys2wire(O_CREAT);
43 ceph_sys2wire(O_EXCL);
44 ceph_sys2wire(O_TRUNC);
45 ceph_sys2wire(O_DIRECTORY);
46 ceph_sys2wire(O_NOFOLLOW);
47
48 #undef ceph_sys2wire
49
50 if (flags)
51 dout("unused open flags: %x\n", flags);
52
53 return cpu_to_le32(wire_flags);
54 }
55
56 /*
57 * Ceph file operations
58 *
59 * Implement basic open/close functionality, and implement
60 * read/write.
61 *
62 * We implement three modes of file I/O:
63 * - buffered uses the generic_file_aio_{read,write} helpers
64 *
65 * - synchronous is used when there is multi-client read/write
66 * sharing, avoids the page cache, and synchronously waits for an
67 * ack from the OSD.
68 *
69 * - direct io takes the variant of the sync path that references
70 * user pages directly.
71 *
72 * fsync() flushes and waits on dirty pages, but just queues metadata
73 * for writeback: since the MDS can recover size and mtime there is no
74 * need to wait for MDS acknowledgement.
75 */
76
77 /*
78 * How many pages to get in one call to iov_iter_get_pages(). This
79 * determines the size of the on-stack array used as a buffer.
80 */
81 #define ITER_GET_BVECS_PAGES 64
82
83 static ssize_t __iter_get_bvecs(struct iov_iter *iter, size_t maxsize,
84 struct bio_vec *bvecs)
85 {
86 size_t size = 0;
87 int bvec_idx = 0;
88
89 if (maxsize > iov_iter_count(iter))
90 maxsize = iov_iter_count(iter);
91
92 while (size < maxsize) {
93 struct page *pages[ITER_GET_BVECS_PAGES];
94 ssize_t bytes;
95 size_t start;
96 int idx = 0;
97
98 bytes = iov_iter_get_pages2(iter, pages, maxsize - size,
99 ITER_GET_BVECS_PAGES, &start);
100 if (bytes < 0)
101 return size ?: bytes;
102
103 size += bytes;
104
105 for ( ; bytes; idx++, bvec_idx++) {
106 struct bio_vec bv = {
107 .bv_page = pages[idx],
108 .bv_len = min_t(int, bytes, PAGE_SIZE - start),
109 .bv_offset = start,
110 };
111
112 bvecs[bvec_idx] = bv;
113 bytes -= bv.bv_len;
114 start = 0;
115 }
116 }
117
118 return size;
119 }
120
121 /*
122 * iov_iter_get_pages() only considers one iov_iter segment, no matter
123 * what maxsize or maxpages are given. For ITER_BVEC that is a single
124 * page.
125 *
126 * Attempt to get up to @maxsize bytes worth of pages from @iter.
127 * Return the number of bytes in the created bio_vec array, or an error.
128 */
129 static ssize_t iter_get_bvecs_alloc(struct iov_iter *iter, size_t maxsize,
130 struct bio_vec **bvecs, int *num_bvecs)
131 {
132 struct bio_vec *bv;
133 size_t orig_count = iov_iter_count(iter);
134 ssize_t bytes;
135 int npages;
136
137 iov_iter_truncate(iter, maxsize);
138 npages = iov_iter_npages(iter, INT_MAX);
139 iov_iter_reexpand(iter, orig_count);
140
141 /*
142 * __iter_get_bvecs() may populate only part of the array -- zero it
143 * out.
144 */
145 bv = kvmalloc_array(npages, sizeof(*bv), GFP_KERNEL | __GFP_ZERO);
146 if (!bv)
147 return -ENOMEM;
148
149 bytes = __iter_get_bvecs(iter, maxsize, bv);
150 if (bytes < 0) {
151 /*
152 * No pages were pinned -- just free the array.
153 */
154 kvfree(bv);
155 return bytes;
156 }
157
158 *bvecs = bv;
159 *num_bvecs = npages;
160 return bytes;
161 }
162
163 static void put_bvecs(struct bio_vec *bvecs, int num_bvecs, bool should_dirty)
164 {
165 int i;
166
167 for (i = 0; i < num_bvecs; i++) {
168 if (bvecs[i].bv_page) {
169 if (should_dirty)
170 set_page_dirty_lock(bvecs[i].bv_page);
171 put_page(bvecs[i].bv_page);
172 }
173 }
174 kvfree(bvecs);
175 }
176
177 /*
178 * Prepare an open request. Preallocate ceph_cap to avoid an
179 * inopportune ENOMEM later.
180 */
181 static struct ceph_mds_request *
182 prepare_open_request(struct super_block *sb, int flags, int create_mode)
183 {
184 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(sb);
185 struct ceph_mds_request *req;
186 int want_auth = USE_ANY_MDS;
187 int op = (flags & O_CREAT) ? CEPH_MDS_OP_CREATE : CEPH_MDS_OP_OPEN;
188
189 if (flags & (O_WRONLY|O_RDWR|O_CREAT|O_TRUNC))
190 want_auth = USE_AUTH_MDS;
191
192 req = ceph_mdsc_create_request(mdsc, op, want_auth);
193 if (IS_ERR(req))
194 goto out;
195 req->r_fmode = ceph_flags_to_mode(flags);
196 req->r_args.open.flags = ceph_flags_sys2wire(flags);
197 req->r_args.open.mode = cpu_to_le32(create_mode);
198 out:
199 return req;
200 }
201
202 static int ceph_init_file_info(struct inode *inode, struct file *file,
203 int fmode, bool isdir)
204 {
205 struct ceph_inode_info *ci = ceph_inode(inode);
206 struct ceph_mount_options *opt =
207 ceph_inode_to_client(&ci->netfs.inode)->mount_options;
208 struct ceph_file_info *fi;
209 int ret;
210
211 dout("%s %p %p 0%o (%s)\n", __func__, inode, file,
212 inode->i_mode, isdir ? "dir" : "regular");
213 BUG_ON(inode->i_fop->release != ceph_release);
214
215 if (isdir) {
216 struct ceph_dir_file_info *dfi =
217 kmem_cache_zalloc(ceph_dir_file_cachep, GFP_KERNEL);
218 if (!dfi)
219 return -ENOMEM;
220
221 file->private_data = dfi;
222 fi = &dfi->file_info;
223 dfi->next_offset = 2;
224 dfi->readdir_cache_idx = -1;
225 } else {
226 fi = kmem_cache_zalloc(ceph_file_cachep, GFP_KERNEL);
227 if (!fi)
228 return -ENOMEM;
229
230 if (opt->flags & CEPH_MOUNT_OPT_NOPAGECACHE)
231 fi->flags |= CEPH_F_SYNC;
232
233 file->private_data = fi;
234 }
235
236 ceph_get_fmode(ci, fmode, 1);
237 fi->fmode = fmode;
238
239 spin_lock_init(&fi->rw_contexts_lock);
240 INIT_LIST_HEAD(&fi->rw_contexts);
241 fi->filp_gen = READ_ONCE(ceph_inode_to_client(inode)->filp_gen);
242
243 if ((file->f_mode & FMODE_WRITE) &&
244 ci->i_inline_version != CEPH_INLINE_NONE) {
245 ret = ceph_uninline_data(file);
246 if (ret < 0)
247 goto error;
248 }
249
250 return 0;
251
252 error:
253 ceph_fscache_unuse_cookie(inode, file->f_mode & FMODE_WRITE);
254 ceph_put_fmode(ci, fi->fmode, 1);
255 kmem_cache_free(ceph_file_cachep, fi);
256 /* wake up anyone waiting for caps on this inode */
257 wake_up_all(&ci->i_cap_wq);
258 return ret;
259 }
260
261 /*
262 * initialize private struct file data.
263 * if we fail, clean up by dropping fmode reference on the ceph_inode
264 */
265 static int ceph_init_file(struct inode *inode, struct file *file, int fmode)
266 {
267 int ret = 0;
268
269 switch (inode->i_mode & S_IFMT) {
270 case S_IFREG:
271 ceph_fscache_use_cookie(inode, file->f_mode & FMODE_WRITE);
272 fallthrough;
273 case S_IFDIR:
274 ret = ceph_init_file_info(inode, file, fmode,
275 S_ISDIR(inode->i_mode));
276 break;
277
278 case S_IFLNK:
279 dout("init_file %p %p 0%o (symlink)\n", inode, file,
280 inode->i_mode);
281 break;
282
283 default:
284 dout("init_file %p %p 0%o (special)\n", inode, file,
285 inode->i_mode);
286 /*
287 * we need to drop the open ref now, since we don't
288 * have .release set to ceph_release.
289 */
290 BUG_ON(inode->i_fop->release == ceph_release);
291
292 /* call the proper open fop */
293 ret = inode->i_fop->open(inode, file);
294 }
295 return ret;
296 }
297
298 /*
299 * try renew caps after session gets killed.
300 */
301 int ceph_renew_caps(struct inode *inode, int fmode)
302 {
303 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
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 dout("renew caps %p want %s issued %s updating mds_wanted\n",
316 inode, ceph_cap_string(wanted), ceph_cap_string(issued));
317 ceph_check_caps(ci, 0, NULL);
318 return 0;
319 }
320 spin_unlock(&ci->i_ceph_lock);
321
322 flags = 0;
323 if ((wanted & CEPH_CAP_FILE_RD) && (wanted & CEPH_CAP_FILE_WR))
324 flags = O_RDWR;
325 else if (wanted & CEPH_CAP_FILE_RD)
326 flags = O_RDONLY;
327 else if (wanted & CEPH_CAP_FILE_WR)
328 flags = O_WRONLY;
329 #ifdef O_LAZY
330 if (wanted & CEPH_CAP_FILE_LAZYIO)
331 flags |= O_LAZY;
332 #endif
333
334 req = prepare_open_request(inode->i_sb, flags, 0);
335 if (IS_ERR(req)) {
336 err = PTR_ERR(req);
337 goto out;
338 }
339
340 req->r_inode = inode;
341 ihold(inode);
342 req->r_num_caps = 1;
343
344 err = ceph_mdsc_do_request(mdsc, NULL, req);
345 ceph_mdsc_put_request(req);
346 out:
347 dout("renew caps %p open result=%d\n", inode, err);
348 return err < 0 ? err : 0;
349 }
350
351 /*
352 * If we already have the requisite capabilities, we can satisfy
353 * the open request locally (no need to request new caps from the
354 * MDS). We do, however, need to inform the MDS (asynchronously)
355 * if our wanted caps set expands.
356 */
357 int ceph_open(struct inode *inode, struct file *file)
358 {
359 struct ceph_inode_info *ci = ceph_inode(inode);
360 struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
361 struct ceph_mds_client *mdsc = fsc->mdsc;
362 struct ceph_mds_request *req;
363 struct ceph_file_info *fi = file->private_data;
364 int err;
365 int flags, fmode, wanted;
366
367 if (fi) {
368 dout("open file %p is already opened\n", file);
369 return 0;
370 }
371
372 /* filter out O_CREAT|O_EXCL; vfs did that already. yuck. */
373 flags = file->f_flags & ~(O_CREAT|O_EXCL);
374 if (S_ISDIR(inode->i_mode))
375 flags = O_DIRECTORY; /* mds likes to know */
376
377 dout("open inode %p ino %llx.%llx file %p flags %d (%d)\n", inode,
378 ceph_vinop(inode), file, flags, file->f_flags);
379 fmode = ceph_flags_to_mode(flags);
380 wanted = ceph_caps_for_mode(fmode);
381
382 /* snapped files are read-only */
383 if (ceph_snap(inode) != CEPH_NOSNAP && (file->f_mode & FMODE_WRITE))
384 return -EROFS;
385
386 /* trivially open snapdir */
387 if (ceph_snap(inode) == CEPH_SNAPDIR) {
388 return ceph_init_file(inode, file, fmode);
389 }
390
391 /*
392 * No need to block if we have caps on the auth MDS (for
393 * write) or any MDS (for read). Update wanted set
394 * asynchronously.
395 */
396 spin_lock(&ci->i_ceph_lock);
397 if (__ceph_is_any_real_caps(ci) &&
398 (((fmode & CEPH_FILE_MODE_WR) == 0) || ci->i_auth_cap)) {
399 int mds_wanted = __ceph_caps_mds_wanted(ci, true);
400 int issued = __ceph_caps_issued(ci, NULL);
401
402 dout("open %p fmode %d want %s issued %s using existing\n",
403 inode, fmode, ceph_cap_string(wanted),
404 ceph_cap_string(issued));
405 __ceph_touch_fmode(ci, mdsc, fmode);
406 spin_unlock(&ci->i_ceph_lock);
407
408 /* adjust wanted? */
409 if ((issued & wanted) != wanted &&
410 (mds_wanted & wanted) != wanted &&
411 ceph_snap(inode) != CEPH_SNAPDIR)
412 ceph_check_caps(ci, 0, NULL);
413
414 return ceph_init_file(inode, file, fmode);
415 } else if (ceph_snap(inode) != CEPH_NOSNAP &&
416 (ci->i_snap_caps & wanted) == wanted) {
417 __ceph_touch_fmode(ci, mdsc, fmode);
418 spin_unlock(&ci->i_ceph_lock);
419 return ceph_init_file(inode, file, fmode);
420 }
421
422 spin_unlock(&ci->i_ceph_lock);
423
424 dout("open fmode %d wants %s\n", fmode, ceph_cap_string(wanted));
425 req = prepare_open_request(inode->i_sb, flags, 0);
426 if (IS_ERR(req)) {
427 err = PTR_ERR(req);
428 goto out;
429 }
430 req->r_inode = inode;
431 ihold(inode);
432
433 req->r_num_caps = 1;
434 err = ceph_mdsc_do_request(mdsc, NULL, req);
435 if (!err)
436 err = ceph_init_file(inode, file, req->r_fmode);
437 ceph_mdsc_put_request(req);
438 dout("open result=%d on %llx.%llx\n", err, ceph_vinop(inode));
439 out:
440 return err;
441 }
442
443 /* Clone the layout from a synchronous create, if the dir now has Dc caps */
444 static void
445 cache_file_layout(struct inode *dst, struct inode *src)
446 {
447 struct ceph_inode_info *cdst = ceph_inode(dst);
448 struct ceph_inode_info *csrc = ceph_inode(src);
449
450 spin_lock(&cdst->i_ceph_lock);
451 if ((__ceph_caps_issued(cdst, NULL) & CEPH_CAP_DIR_CREATE) &&
452 !ceph_file_layout_is_valid(&cdst->i_cached_layout)) {
453 memcpy(&cdst->i_cached_layout, &csrc->i_layout,
454 sizeof(cdst->i_cached_layout));
455 rcu_assign_pointer(cdst->i_cached_layout.pool_ns,
456 ceph_try_get_string(csrc->i_layout.pool_ns));
457 }
458 spin_unlock(&cdst->i_ceph_lock);
459 }
460
461 /*
462 * Try to set up an async create. We need caps, a file layout, and inode number,
463 * and either a lease on the dentry or complete dir info. If any of those
464 * criteria are not satisfied, then return false and the caller can go
465 * synchronous.
466 */
467 static int try_prep_async_create(struct inode *dir, struct dentry *dentry,
468 struct ceph_file_layout *lo, u64 *pino)
469 {
470 struct ceph_inode_info *ci = ceph_inode(dir);
471 struct ceph_dentry_info *di = ceph_dentry(dentry);
472 int got = 0, want = CEPH_CAP_FILE_EXCL | CEPH_CAP_DIR_CREATE;
473 u64 ino;
474
475 spin_lock(&ci->i_ceph_lock);
476 /* No auth cap means no chance for Dc caps */
477 if (!ci->i_auth_cap)
478 goto no_async;
479
480 /* Any delegated inos? */
481 if (xa_empty(&ci->i_auth_cap->session->s_delegated_inos))
482 goto no_async;
483
484 if (!ceph_file_layout_is_valid(&ci->i_cached_layout))
485 goto no_async;
486
487 if ((__ceph_caps_issued(ci, NULL) & want) != want)
488 goto no_async;
489
490 if (d_in_lookup(dentry)) {
491 if (!__ceph_dir_is_complete(ci))
492 goto no_async;
493 spin_lock(&dentry->d_lock);
494 di->lease_shared_gen = atomic_read(&ci->i_shared_gen);
495 spin_unlock(&dentry->d_lock);
496 } else if (atomic_read(&ci->i_shared_gen) !=
497 READ_ONCE(di->lease_shared_gen)) {
498 goto no_async;
499 }
500
501 ino = ceph_get_deleg_ino(ci->i_auth_cap->session);
502 if (!ino)
503 goto no_async;
504
505 *pino = ino;
506 ceph_take_cap_refs(ci, want, false);
507 memcpy(lo, &ci->i_cached_layout, sizeof(*lo));
508 rcu_assign_pointer(lo->pool_ns,
509 ceph_try_get_string(ci->i_cached_layout.pool_ns));
510 got = want;
511 no_async:
512 spin_unlock(&ci->i_ceph_lock);
513 return got;
514 }
515
516 static void restore_deleg_ino(struct inode *dir, u64 ino)
517 {
518 struct ceph_inode_info *ci = ceph_inode(dir);
519 struct ceph_mds_session *s = NULL;
520
521 spin_lock(&ci->i_ceph_lock);
522 if (ci->i_auth_cap)
523 s = ceph_get_mds_session(ci->i_auth_cap->session);
524 spin_unlock(&ci->i_ceph_lock);
525 if (s) {
526 int err = ceph_restore_deleg_ino(s, ino);
527 if (err)
528 pr_warn("ceph: unable to restore delegated ino 0x%llx to session: %d\n",
529 ino, err);
530 ceph_put_mds_session(s);
531 }
532 }
533
534 static void wake_async_create_waiters(struct inode *inode,
535 struct ceph_mds_session *session)
536 {
537 struct ceph_inode_info *ci = ceph_inode(inode);
538
539 spin_lock(&ci->i_ceph_lock);
540 if (ci->i_ceph_flags & CEPH_I_ASYNC_CREATE) {
541 ci->i_ceph_flags &= ~CEPH_I_ASYNC_CREATE;
542 wake_up_bit(&ci->i_ceph_flags, CEPH_ASYNC_CREATE_BIT);
543 }
544 ceph_kick_flushing_inode_caps(session, ci);
545 spin_unlock(&ci->i_ceph_lock);
546 }
547
548 static void ceph_async_create_cb(struct ceph_mds_client *mdsc,
549 struct ceph_mds_request *req)
550 {
551 struct dentry *dentry = req->r_dentry;
552 struct inode *dinode = d_inode(dentry);
553 struct inode *tinode = req->r_target_inode;
554 int result = req->r_err ? req->r_err :
555 le32_to_cpu(req->r_reply_info.head->result);
556
557 WARN_ON_ONCE(dinode && tinode && dinode != tinode);
558
559 /* MDS changed -- caller must resubmit */
560 if (result == -EJUKEBOX)
561 goto out;
562
563 mapping_set_error(req->r_parent->i_mapping, result);
564
565 if (result) {
566 int pathlen = 0;
567 u64 base = 0;
568 char *path = ceph_mdsc_build_path(req->r_dentry, &pathlen,
569 &base, 0);
570
571 pr_warn("ceph: async create failure path=(%llx)%s result=%d!\n",
572 base, IS_ERR(path) ? "<<bad>>" : path, result);
573 ceph_mdsc_free_path(path, pathlen);
574
575 ceph_dir_clear_complete(req->r_parent);
576 if (!d_unhashed(dentry))
577 d_drop(dentry);
578
579 if (dinode) {
580 mapping_set_error(dinode->i_mapping, result);
581 ceph_inode_shutdown(dinode);
582 wake_async_create_waiters(dinode, req->r_session);
583 }
584 }
585
586 if (tinode) {
587 u64 ino = ceph_vino(tinode).ino;
588
589 if (req->r_deleg_ino != ino)
590 pr_warn("%s: inode number mismatch! err=%d deleg_ino=0x%llx target=0x%llx\n",
591 __func__, req->r_err, req->r_deleg_ino, ino);
592
593 mapping_set_error(tinode->i_mapping, result);
594 wake_async_create_waiters(tinode, req->r_session);
595 } else if (!result) {
596 pr_warn("%s: no req->r_target_inode for 0x%llx\n", __func__,
597 req->r_deleg_ino);
598 }
599 out:
600 ceph_mdsc_release_dir_caps(req);
601 }
602
603 static int ceph_finish_async_create(struct inode *dir, struct dentry *dentry,
604 struct file *file, umode_t mode,
605 struct ceph_mds_request *req,
606 struct ceph_acl_sec_ctx *as_ctx,
607 struct ceph_file_layout *lo)
608 {
609 int ret;
610 char xattr_buf[4];
611 struct ceph_mds_reply_inode in = { };
612 struct ceph_mds_reply_info_in iinfo = { .in = &in };
613 struct ceph_inode_info *ci = ceph_inode(dir);
614 struct inode *inode;
615 struct timespec64 now;
616 struct ceph_string *pool_ns;
617 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb);
618 struct ceph_vino vino = { .ino = req->r_deleg_ino,
619 .snap = CEPH_NOSNAP };
620
621 ktime_get_real_ts64(&now);
622
623 inode = ceph_get_inode(dentry->d_sb, vino);
624 if (IS_ERR(inode))
625 return PTR_ERR(inode);
626
627 iinfo.inline_version = CEPH_INLINE_NONE;
628 iinfo.change_attr = 1;
629 ceph_encode_timespec64(&iinfo.btime, &now);
630
631 if (req->r_pagelist) {
632 iinfo.xattr_len = req->r_pagelist->length;
633 iinfo.xattr_data = req->r_pagelist->mapped_tail;
634 } else {
635 /* fake it */
636 iinfo.xattr_len = ARRAY_SIZE(xattr_buf);
637 iinfo.xattr_data = xattr_buf;
638 memset(iinfo.xattr_data, 0, iinfo.xattr_len);
639 }
640
641 in.ino = cpu_to_le64(vino.ino);
642 in.snapid = cpu_to_le64(CEPH_NOSNAP);
643 in.version = cpu_to_le64(1); // ???
644 in.cap.caps = in.cap.wanted = cpu_to_le32(CEPH_CAP_ALL_FILE);
645 in.cap.cap_id = cpu_to_le64(1);
646 in.cap.realm = cpu_to_le64(ci->i_snap_realm->ino);
647 in.cap.flags = CEPH_CAP_FLAG_AUTH;
648 in.ctime = in.mtime = in.atime = iinfo.btime;
649 in.truncate_seq = cpu_to_le32(1);
650 in.truncate_size = cpu_to_le64(-1ULL);
651 in.xattr_version = cpu_to_le64(1);
652 in.uid = cpu_to_le32(from_kuid(&init_user_ns, current_fsuid()));
653 if (dir->i_mode & S_ISGID) {
654 in.gid = cpu_to_le32(from_kgid(&init_user_ns, dir->i_gid));
655
656 /* Directories always inherit the setgid bit. */
657 if (S_ISDIR(mode))
658 mode |= S_ISGID;
659 } else {
660 in.gid = cpu_to_le32(from_kgid(&init_user_ns, current_fsgid()));
661 }
662 in.mode = cpu_to_le32((u32)mode);
663
664 in.nlink = cpu_to_le32(1);
665 in.max_size = cpu_to_le64(lo->stripe_unit);
666
667 ceph_file_layout_to_legacy(lo, &in.layout);
668 /* lo is private, so pool_ns can't change */
669 pool_ns = rcu_dereference_raw(lo->pool_ns);
670 if (pool_ns) {
671 iinfo.pool_ns_len = pool_ns->len;
672 iinfo.pool_ns_data = pool_ns->str;
673 }
674
675 down_read(&mdsc->snap_rwsem);
676 ret = ceph_fill_inode(inode, NULL, &iinfo, NULL, req->r_session,
677 req->r_fmode, NULL);
678 up_read(&mdsc->snap_rwsem);
679 if (ret) {
680 dout("%s failed to fill inode: %d\n", __func__, ret);
681 ceph_dir_clear_complete(dir);
682 if (!d_unhashed(dentry))
683 d_drop(dentry);
684 if (inode->i_state & I_NEW)
685 discard_new_inode(inode);
686 } else {
687 struct dentry *dn;
688
689 dout("%s d_adding new inode 0x%llx to 0x%llx/%s\n", __func__,
690 vino.ino, ceph_ino(dir), dentry->d_name.name);
691 ceph_dir_clear_ordered(dir);
692 ceph_init_inode_acls(inode, as_ctx);
693 if (inode->i_state & I_NEW) {
694 /*
695 * If it's not I_NEW, then someone created this before
696 * we got here. Assume the server is aware of it at
697 * that point and don't worry about setting
698 * CEPH_I_ASYNC_CREATE.
699 */
700 ceph_inode(inode)->i_ceph_flags = CEPH_I_ASYNC_CREATE;
701 unlock_new_inode(inode);
702 }
703 if (d_in_lookup(dentry) || d_really_is_negative(dentry)) {
704 if (!d_unhashed(dentry))
705 d_drop(dentry);
706 dn = d_splice_alias(inode, dentry);
707 WARN_ON_ONCE(dn && dn != dentry);
708 }
709 file->f_mode |= FMODE_CREATED;
710 ret = finish_open(file, dentry, ceph_open);
711 }
712 return ret;
713 }
714
715 /*
716 * Do a lookup + open with a single request. If we get a non-existent
717 * file or symlink, return 1 so the VFS can retry.
718 */
719 int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
720 struct file *file, unsigned flags, umode_t mode)
721 {
722 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
723 struct ceph_mds_client *mdsc = fsc->mdsc;
724 struct ceph_mds_request *req;
725 struct dentry *dn;
726 struct ceph_acl_sec_ctx as_ctx = {};
727 bool try_async = ceph_test_mount_opt(fsc, ASYNC_DIROPS);
728 int mask;
729 int err;
730
731 dout("atomic_open %p dentry %p '%pd' %s flags %d mode 0%o\n",
732 dir, dentry, dentry,
733 d_unhashed(dentry) ? "unhashed" : "hashed", flags, mode);
734
735 if (dentry->d_name.len > NAME_MAX)
736 return -ENAMETOOLONG;
737
738 if (flags & O_CREAT) {
739 if (ceph_quota_is_max_files_exceeded(dir))
740 return -EDQUOT;
741 err = ceph_pre_init_acls(dir, &mode, &as_ctx);
742 if (err < 0)
743 return err;
744 err = ceph_security_init_secctx(dentry, mode, &as_ctx);
745 if (err < 0)
746 goto out_ctx;
747 /* Async create can't handle more than a page of xattrs */
748 if (as_ctx.pagelist &&
749 !list_is_singular(&as_ctx.pagelist->head))
750 try_async = false;
751 } else if (!d_in_lookup(dentry)) {
752 /* If it's not being looked up, it's negative */
753 return -ENOENT;
754 }
755 retry:
756 /* do the open */
757 req = prepare_open_request(dir->i_sb, flags, mode);
758 if (IS_ERR(req)) {
759 err = PTR_ERR(req);
760 goto out_ctx;
761 }
762 req->r_dentry = dget(dentry);
763 req->r_num_caps = 2;
764 mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED;
765 if (ceph_security_xattr_wanted(dir))
766 mask |= CEPH_CAP_XATTR_SHARED;
767 req->r_args.open.mask = cpu_to_le32(mask);
768 req->r_parent = dir;
769 ihold(dir);
770
771 if (flags & O_CREAT) {
772 struct ceph_file_layout lo;
773
774 req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL;
775 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
776 if (as_ctx.pagelist) {
777 req->r_pagelist = as_ctx.pagelist;
778 as_ctx.pagelist = NULL;
779 }
780 if (try_async &&
781 (req->r_dir_caps =
782 try_prep_async_create(dir, dentry, &lo,
783 &req->r_deleg_ino))) {
784 set_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags);
785 req->r_args.open.flags |= cpu_to_le32(CEPH_O_EXCL);
786 req->r_callback = ceph_async_create_cb;
787 err = ceph_mdsc_submit_request(mdsc, dir, req);
788 if (!err) {
789 err = ceph_finish_async_create(dir, dentry,
790 file, mode, req,
791 &as_ctx, &lo);
792 } else if (err == -EJUKEBOX) {
793 restore_deleg_ino(dir, req->r_deleg_ino);
794 ceph_mdsc_put_request(req);
795 try_async = false;
796 ceph_put_string(rcu_dereference_raw(lo.pool_ns));
797 goto retry;
798 }
799 ceph_put_string(rcu_dereference_raw(lo.pool_ns));
800 goto out_req;
801 }
802 }
803
804 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
805 err = ceph_mdsc_do_request(mdsc,
806 (flags & (O_CREAT|O_TRUNC)) ? dir : NULL,
807 req);
808 if (err == -ENOENT) {
809 dentry = ceph_handle_snapdir(req, dentry);
810 if (IS_ERR(dentry)) {
811 err = PTR_ERR(dentry);
812 goto out_req;
813 }
814 err = 0;
815 }
816
817 if (!err && (flags & O_CREAT) && !req->r_reply_info.head->is_dentry)
818 err = ceph_handle_notrace_create(dir, dentry);
819
820 if (d_in_lookup(dentry)) {
821 dn = ceph_finish_lookup(req, dentry, err);
822 if (IS_ERR(dn))
823 err = PTR_ERR(dn);
824 } else {
825 /* we were given a hashed negative dentry */
826 dn = NULL;
827 }
828 if (err)
829 goto out_req;
830 if (dn || d_really_is_negative(dentry) || d_is_symlink(dentry)) {
831 /* make vfs retry on splice, ENOENT, or symlink */
832 dout("atomic_open finish_no_open on dn %p\n", dn);
833 err = finish_no_open(file, dn);
834 } else {
835 dout("atomic_open finish_open on dn %p\n", dn);
836 if (req->r_op == CEPH_MDS_OP_CREATE && req->r_reply_info.has_create_ino) {
837 struct inode *newino = d_inode(dentry);
838
839 cache_file_layout(dir, newino);
840 ceph_init_inode_acls(newino, &as_ctx);
841 file->f_mode |= FMODE_CREATED;
842 }
843 err = finish_open(file, dentry, ceph_open);
844 }
845 out_req:
846 ceph_mdsc_put_request(req);
847 out_ctx:
848 ceph_release_acl_sec_ctx(&as_ctx);
849 dout("atomic_open result=%d\n", err);
850 return err;
851 }
852
853 int ceph_release(struct inode *inode, struct file *file)
854 {
855 struct ceph_inode_info *ci = ceph_inode(inode);
856
857 if (S_ISDIR(inode->i_mode)) {
858 struct ceph_dir_file_info *dfi = file->private_data;
859 dout("release inode %p dir file %p\n", inode, file);
860 WARN_ON(!list_empty(&dfi->file_info.rw_contexts));
861
862 ceph_put_fmode(ci, dfi->file_info.fmode, 1);
863
864 if (dfi->last_readdir)
865 ceph_mdsc_put_request(dfi->last_readdir);
866 kfree(dfi->last_name);
867 kfree(dfi->dir_info);
868 kmem_cache_free(ceph_dir_file_cachep, dfi);
869 } else {
870 struct ceph_file_info *fi = file->private_data;
871 dout("release inode %p regular file %p\n", inode, file);
872 WARN_ON(!list_empty(&fi->rw_contexts));
873
874 ceph_fscache_unuse_cookie(inode, file->f_mode & FMODE_WRITE);
875 ceph_put_fmode(ci, fi->fmode, 1);
876
877 kmem_cache_free(ceph_file_cachep, fi);
878 }
879
880 /* wake up anyone waiting for caps on this inode */
881 wake_up_all(&ci->i_cap_wq);
882 return 0;
883 }
884
885 enum {
886 HAVE_RETRIED = 1,
887 CHECK_EOF = 2,
888 READ_INLINE = 3,
889 };
890
891 /*
892 * Completely synchronous read and write methods. Direct from __user
893 * buffer to osd, or directly to user pages (if O_DIRECT).
894 *
895 * If the read spans object boundary, just do multiple reads. (That's not
896 * atomic, but good enough for now.)
897 *
898 * If we get a short result from the OSD, check against i_size; we need to
899 * only return a short read to the caller if we hit EOF.
900 */
901 static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *to,
902 int *retry_op)
903 {
904 struct file *file = iocb->ki_filp;
905 struct inode *inode = file_inode(file);
906 struct ceph_inode_info *ci = ceph_inode(inode);
907 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
908 struct ceph_osd_client *osdc = &fsc->client->osdc;
909 ssize_t ret;
910 u64 off = iocb->ki_pos;
911 u64 len = iov_iter_count(to);
912 u64 i_size = i_size_read(inode);
913
914 dout("sync_read on file %p %llu~%u %s\n", file, off, (unsigned)len,
915 (file->f_flags & O_DIRECT) ? "O_DIRECT" : "");
916
917 if (!len)
918 return 0;
919 /*
920 * flush any page cache pages in this range. this
921 * will make concurrent normal and sync io slow,
922 * but it will at least behave sensibly when they are
923 * in sequence.
924 */
925 ret = filemap_write_and_wait_range(inode->i_mapping,
926 off, off + len - 1);
927 if (ret < 0)
928 return ret;
929
930 ret = 0;
931 while ((len = iov_iter_count(to)) > 0) {
932 struct ceph_osd_request *req;
933 struct page **pages;
934 int num_pages;
935 size_t page_off;
936 bool more;
937 int idx;
938 size_t left;
939
940 req = ceph_osdc_new_request(osdc, &ci->i_layout,
941 ci->i_vino, off, &len, 0, 1,
942 CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ,
943 NULL, ci->i_truncate_seq,
944 ci->i_truncate_size, false);
945 if (IS_ERR(req)) {
946 ret = PTR_ERR(req);
947 break;
948 }
949
950 more = len < iov_iter_count(to);
951
952 num_pages = calc_pages_for(off, len);
953 page_off = off & ~PAGE_MASK;
954 pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL);
955 if (IS_ERR(pages)) {
956 ceph_osdc_put_request(req);
957 ret = PTR_ERR(pages);
958 break;
959 }
960
961 osd_req_op_extent_osd_data_pages(req, 0, pages, len, page_off,
962 false, false);
963 ret = ceph_osdc_start_request(osdc, req, false);
964 if (!ret)
965 ret = ceph_osdc_wait_request(osdc, req);
966
967 ceph_update_read_metrics(&fsc->mdsc->metric,
968 req->r_start_latency,
969 req->r_end_latency,
970 len, ret);
971
972 ceph_osdc_put_request(req);
973
974 i_size = i_size_read(inode);
975 dout("sync_read %llu~%llu got %zd i_size %llu%s\n",
976 off, len, ret, i_size, (more ? " MORE" : ""));
977
978 if (ret == -ENOENT)
979 ret = 0;
980 if (ret >= 0 && ret < len && (off + ret < i_size)) {
981 int zlen = min(len - ret, i_size - off - ret);
982 int zoff = page_off + ret;
983 dout("sync_read zero gap %llu~%llu\n",
984 off + ret, off + ret + zlen);
985 ceph_zero_page_vector_range(zoff, zlen, pages);
986 ret += zlen;
987 }
988
989 idx = 0;
990 left = ret > 0 ? ret : 0;
991 while (left > 0) {
992 size_t len, copied;
993 page_off = off & ~PAGE_MASK;
994 len = min_t(size_t, left, PAGE_SIZE - page_off);
995 SetPageUptodate(pages[idx]);
996 copied = copy_page_to_iter(pages[idx++],
997 page_off, len, to);
998 off += copied;
999 left -= copied;
1000 if (copied < len) {
1001 ret = -EFAULT;
1002 break;
1003 }
1004 }
1005 ceph_release_page_vector(pages, num_pages);
1006
1007 if (ret < 0) {
1008 if (ret == -EBLOCKLISTED)
1009 fsc->blocklisted = true;
1010 break;
1011 }
1012
1013 if (off >= i_size || !more)
1014 break;
1015 }
1016
1017 if (off > iocb->ki_pos) {
1018 if (off >= i_size) {
1019 *retry_op = CHECK_EOF;
1020 ret = i_size - iocb->ki_pos;
1021 iocb->ki_pos = i_size;
1022 } else {
1023 ret = off - iocb->ki_pos;
1024 iocb->ki_pos = off;
1025 }
1026 }
1027
1028 dout("sync_read result %zd retry_op %d\n", ret, *retry_op);
1029 return ret;
1030 }
1031
1032 struct ceph_aio_request {
1033 struct kiocb *iocb;
1034 size_t total_len;
1035 bool write;
1036 bool should_dirty;
1037 int error;
1038 struct list_head osd_reqs;
1039 unsigned num_reqs;
1040 atomic_t pending_reqs;
1041 struct timespec64 mtime;
1042 struct ceph_cap_flush *prealloc_cf;
1043 };
1044
1045 struct ceph_aio_work {
1046 struct work_struct work;
1047 struct ceph_osd_request *req;
1048 };
1049
1050 static void ceph_aio_retry_work(struct work_struct *work);
1051
1052 static void ceph_aio_complete(struct inode *inode,
1053 struct ceph_aio_request *aio_req)
1054 {
1055 struct ceph_inode_info *ci = ceph_inode(inode);
1056 int ret;
1057
1058 if (!atomic_dec_and_test(&aio_req->pending_reqs))
1059 return;
1060
1061 if (aio_req->iocb->ki_flags & IOCB_DIRECT)
1062 inode_dio_end(inode);
1063
1064 ret = aio_req->error;
1065 if (!ret)
1066 ret = aio_req->total_len;
1067
1068 dout("ceph_aio_complete %p rc %d\n", inode, ret);
1069
1070 if (ret >= 0 && aio_req->write) {
1071 int dirty;
1072
1073 loff_t endoff = aio_req->iocb->ki_pos + aio_req->total_len;
1074 if (endoff > i_size_read(inode)) {
1075 if (ceph_inode_set_size(inode, endoff))
1076 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
1077 }
1078
1079 spin_lock(&ci->i_ceph_lock);
1080 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
1081 &aio_req->prealloc_cf);
1082 spin_unlock(&ci->i_ceph_lock);
1083 if (dirty)
1084 __mark_inode_dirty(inode, dirty);
1085
1086 }
1087
1088 ceph_put_cap_refs(ci, (aio_req->write ? CEPH_CAP_FILE_WR :
1089 CEPH_CAP_FILE_RD));
1090
1091 aio_req->iocb->ki_complete(aio_req->iocb, ret);
1092
1093 ceph_free_cap_flush(aio_req->prealloc_cf);
1094 kfree(aio_req);
1095 }
1096
1097 static void ceph_aio_complete_req(struct ceph_osd_request *req)
1098 {
1099 int rc = req->r_result;
1100 struct inode *inode = req->r_inode;
1101 struct ceph_aio_request *aio_req = req->r_priv;
1102 struct ceph_osd_data *osd_data = osd_req_op_extent_osd_data(req, 0);
1103 struct ceph_client_metric *metric = &ceph_sb_to_mdsc(inode->i_sb)->metric;
1104 unsigned int len = osd_data->bvec_pos.iter.bi_size;
1105
1106 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_BVECS);
1107 BUG_ON(!osd_data->num_bvecs);
1108
1109 dout("ceph_aio_complete_req %p rc %d bytes %u\n", inode, rc, len);
1110
1111 if (rc == -EOLDSNAPC) {
1112 struct ceph_aio_work *aio_work;
1113 BUG_ON(!aio_req->write);
1114
1115 aio_work = kmalloc(sizeof(*aio_work), GFP_NOFS);
1116 if (aio_work) {
1117 INIT_WORK(&aio_work->work, ceph_aio_retry_work);
1118 aio_work->req = req;
1119 queue_work(ceph_inode_to_client(inode)->inode_wq,
1120 &aio_work->work);
1121 return;
1122 }
1123 rc = -ENOMEM;
1124 } else if (!aio_req->write) {
1125 if (rc == -ENOENT)
1126 rc = 0;
1127 if (rc >= 0 && len > rc) {
1128 struct iov_iter i;
1129 int zlen = len - rc;
1130
1131 /*
1132 * If read is satisfied by single OSD request,
1133 * it can pass EOF. Otherwise read is within
1134 * i_size.
1135 */
1136 if (aio_req->num_reqs == 1) {
1137 loff_t i_size = i_size_read(inode);
1138 loff_t endoff = aio_req->iocb->ki_pos + rc;
1139 if (endoff < i_size)
1140 zlen = min_t(size_t, zlen,
1141 i_size - endoff);
1142 aio_req->total_len = rc + zlen;
1143 }
1144
1145 iov_iter_bvec(&i, READ, osd_data->bvec_pos.bvecs,
1146 osd_data->num_bvecs, len);
1147 iov_iter_advance(&i, rc);
1148 iov_iter_zero(zlen, &i);
1149 }
1150 }
1151
1152 /* r_start_latency == 0 means the request was not submitted */
1153 if (req->r_start_latency) {
1154 if (aio_req->write)
1155 ceph_update_write_metrics(metric, req->r_start_latency,
1156 req->r_end_latency, len, rc);
1157 else
1158 ceph_update_read_metrics(metric, req->r_start_latency,
1159 req->r_end_latency, len, rc);
1160 }
1161
1162 put_bvecs(osd_data->bvec_pos.bvecs, osd_data->num_bvecs,
1163 aio_req->should_dirty);
1164 ceph_osdc_put_request(req);
1165
1166 if (rc < 0)
1167 cmpxchg(&aio_req->error, 0, rc);
1168
1169 ceph_aio_complete(inode, aio_req);
1170 return;
1171 }
1172
1173 static void ceph_aio_retry_work(struct work_struct *work)
1174 {
1175 struct ceph_aio_work *aio_work =
1176 container_of(work, struct ceph_aio_work, work);
1177 struct ceph_osd_request *orig_req = aio_work->req;
1178 struct ceph_aio_request *aio_req = orig_req->r_priv;
1179 struct inode *inode = orig_req->r_inode;
1180 struct ceph_inode_info *ci = ceph_inode(inode);
1181 struct ceph_snap_context *snapc;
1182 struct ceph_osd_request *req;
1183 int ret;
1184
1185 spin_lock(&ci->i_ceph_lock);
1186 if (__ceph_have_pending_cap_snap(ci)) {
1187 struct ceph_cap_snap *capsnap =
1188 list_last_entry(&ci->i_cap_snaps,
1189 struct ceph_cap_snap,
1190 ci_item);
1191 snapc = ceph_get_snap_context(capsnap->context);
1192 } else {
1193 BUG_ON(!ci->i_head_snapc);
1194 snapc = ceph_get_snap_context(ci->i_head_snapc);
1195 }
1196 spin_unlock(&ci->i_ceph_lock);
1197
1198 req = ceph_osdc_alloc_request(orig_req->r_osdc, snapc, 1,
1199 false, GFP_NOFS);
1200 if (!req) {
1201 ret = -ENOMEM;
1202 req = orig_req;
1203 goto out;
1204 }
1205
1206 req->r_flags = /* CEPH_OSD_FLAG_ORDERSNAP | */ CEPH_OSD_FLAG_WRITE;
1207 ceph_oloc_copy(&req->r_base_oloc, &orig_req->r_base_oloc);
1208 ceph_oid_copy(&req->r_base_oid, &orig_req->r_base_oid);
1209
1210 req->r_ops[0] = orig_req->r_ops[0];
1211
1212 req->r_mtime = aio_req->mtime;
1213 req->r_data_offset = req->r_ops[0].extent.offset;
1214
1215 ret = ceph_osdc_alloc_messages(req, GFP_NOFS);
1216 if (ret) {
1217 ceph_osdc_put_request(req);
1218 req = orig_req;
1219 goto out;
1220 }
1221
1222 ceph_osdc_put_request(orig_req);
1223
1224 req->r_callback = ceph_aio_complete_req;
1225 req->r_inode = inode;
1226 req->r_priv = aio_req;
1227
1228 ret = ceph_osdc_start_request(req->r_osdc, req, false);
1229 out:
1230 if (ret < 0) {
1231 req->r_result = ret;
1232 ceph_aio_complete_req(req);
1233 }
1234
1235 ceph_put_snap_context(snapc);
1236 kfree(aio_work);
1237 }
1238
1239 static ssize_t
1240 ceph_direct_read_write(struct kiocb *iocb, struct iov_iter *iter,
1241 struct ceph_snap_context *snapc,
1242 struct ceph_cap_flush **pcf)
1243 {
1244 struct file *file = iocb->ki_filp;
1245 struct inode *inode = file_inode(file);
1246 struct ceph_inode_info *ci = ceph_inode(inode);
1247 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1248 struct ceph_client_metric *metric = &fsc->mdsc->metric;
1249 struct ceph_vino vino;
1250 struct ceph_osd_request *req;
1251 struct bio_vec *bvecs;
1252 struct ceph_aio_request *aio_req = NULL;
1253 int num_pages = 0;
1254 int flags;
1255 int ret = 0;
1256 struct timespec64 mtime = current_time(inode);
1257 size_t count = iov_iter_count(iter);
1258 loff_t pos = iocb->ki_pos;
1259 bool write = iov_iter_rw(iter) == WRITE;
1260 bool should_dirty = !write && user_backed_iter(iter);
1261
1262 if (write && ceph_snap(file_inode(file)) != CEPH_NOSNAP)
1263 return -EROFS;
1264
1265 dout("sync_direct_%s on file %p %lld~%u snapc %p seq %lld\n",
1266 (write ? "write" : "read"), file, pos, (unsigned)count,
1267 snapc, snapc ? snapc->seq : 0);
1268
1269 if (write) {
1270 int ret2;
1271
1272 ceph_fscache_invalidate(inode, true);
1273
1274 ret2 = invalidate_inode_pages2_range(inode->i_mapping,
1275 pos >> PAGE_SHIFT,
1276 (pos + count - 1) >> PAGE_SHIFT);
1277 if (ret2 < 0)
1278 dout("invalidate_inode_pages2_range returned %d\n", ret2);
1279
1280 flags = /* CEPH_OSD_FLAG_ORDERSNAP | */ CEPH_OSD_FLAG_WRITE;
1281 } else {
1282 flags = CEPH_OSD_FLAG_READ;
1283 }
1284
1285 while (iov_iter_count(iter) > 0) {
1286 u64 size = iov_iter_count(iter);
1287 ssize_t len;
1288
1289 if (write)
1290 size = min_t(u64, size, fsc->mount_options->wsize);
1291 else
1292 size = min_t(u64, size, fsc->mount_options->rsize);
1293
1294 vino = ceph_vino(inode);
1295 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1296 vino, pos, &size, 0,
1297 1,
1298 write ? CEPH_OSD_OP_WRITE :
1299 CEPH_OSD_OP_READ,
1300 flags, snapc,
1301 ci->i_truncate_seq,
1302 ci->i_truncate_size,
1303 false);
1304 if (IS_ERR(req)) {
1305 ret = PTR_ERR(req);
1306 break;
1307 }
1308
1309 len = iter_get_bvecs_alloc(iter, size, &bvecs, &num_pages);
1310 if (len < 0) {
1311 ceph_osdc_put_request(req);
1312 ret = len;
1313 break;
1314 }
1315 if (len != size)
1316 osd_req_op_extent_update(req, 0, len);
1317
1318 /*
1319 * To simplify error handling, allow AIO when IO within i_size
1320 * or IO can be satisfied by single OSD request.
1321 */
1322 if (pos == iocb->ki_pos && !is_sync_kiocb(iocb) &&
1323 (len == count || pos + count <= i_size_read(inode))) {
1324 aio_req = kzalloc(sizeof(*aio_req), GFP_KERNEL);
1325 if (aio_req) {
1326 aio_req->iocb = iocb;
1327 aio_req->write = write;
1328 aio_req->should_dirty = should_dirty;
1329 INIT_LIST_HEAD(&aio_req->osd_reqs);
1330 if (write) {
1331 aio_req->mtime = mtime;
1332 swap(aio_req->prealloc_cf, *pcf);
1333 }
1334 }
1335 /* ignore error */
1336 }
1337
1338 if (write) {
1339 /*
1340 * throw out any page cache pages in this range. this
1341 * may block.
1342 */
1343 truncate_inode_pages_range(inode->i_mapping, pos,
1344 PAGE_ALIGN(pos + len) - 1);
1345
1346 req->r_mtime = mtime;
1347 }
1348
1349 osd_req_op_extent_osd_data_bvecs(req, 0, bvecs, num_pages, len);
1350
1351 if (aio_req) {
1352 aio_req->total_len += len;
1353 aio_req->num_reqs++;
1354 atomic_inc(&aio_req->pending_reqs);
1355
1356 req->r_callback = ceph_aio_complete_req;
1357 req->r_inode = inode;
1358 req->r_priv = aio_req;
1359 list_add_tail(&req->r_private_item, &aio_req->osd_reqs);
1360
1361 pos += len;
1362 continue;
1363 }
1364
1365 ret = ceph_osdc_start_request(req->r_osdc, req, false);
1366 if (!ret)
1367 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
1368
1369 if (write)
1370 ceph_update_write_metrics(metric, req->r_start_latency,
1371 req->r_end_latency, len, ret);
1372 else
1373 ceph_update_read_metrics(metric, req->r_start_latency,
1374 req->r_end_latency, len, ret);
1375
1376 size = i_size_read(inode);
1377 if (!write) {
1378 if (ret == -ENOENT)
1379 ret = 0;
1380 if (ret >= 0 && ret < len && pos + ret < size) {
1381 struct iov_iter i;
1382 int zlen = min_t(size_t, len - ret,
1383 size - pos - ret);
1384
1385 iov_iter_bvec(&i, READ, bvecs, num_pages, len);
1386 iov_iter_advance(&i, ret);
1387 iov_iter_zero(zlen, &i);
1388 ret += zlen;
1389 }
1390 if (ret >= 0)
1391 len = ret;
1392 }
1393
1394 put_bvecs(bvecs, num_pages, should_dirty);
1395 ceph_osdc_put_request(req);
1396 if (ret < 0)
1397 break;
1398
1399 pos += len;
1400 if (!write && pos >= size)
1401 break;
1402
1403 if (write && pos > size) {
1404 if (ceph_inode_set_size(inode, pos))
1405 ceph_check_caps(ceph_inode(inode),
1406 CHECK_CAPS_AUTHONLY,
1407 NULL);
1408 }
1409 }
1410
1411 if (aio_req) {
1412 LIST_HEAD(osd_reqs);
1413
1414 if (aio_req->num_reqs == 0) {
1415 kfree(aio_req);
1416 return ret;
1417 }
1418
1419 ceph_get_cap_refs(ci, write ? CEPH_CAP_FILE_WR :
1420 CEPH_CAP_FILE_RD);
1421
1422 list_splice(&aio_req->osd_reqs, &osd_reqs);
1423 inode_dio_begin(inode);
1424 while (!list_empty(&osd_reqs)) {
1425 req = list_first_entry(&osd_reqs,
1426 struct ceph_osd_request,
1427 r_private_item);
1428 list_del_init(&req->r_private_item);
1429 if (ret >= 0)
1430 ret = ceph_osdc_start_request(req->r_osdc,
1431 req, false);
1432 if (ret < 0) {
1433 req->r_result = ret;
1434 ceph_aio_complete_req(req);
1435 }
1436 }
1437 return -EIOCBQUEUED;
1438 }
1439
1440 if (ret != -EOLDSNAPC && pos > iocb->ki_pos) {
1441 ret = pos - iocb->ki_pos;
1442 iocb->ki_pos = pos;
1443 }
1444 return ret;
1445 }
1446
1447 /*
1448 * Synchronous write, straight from __user pointer or user pages.
1449 *
1450 * If write spans object boundary, just do multiple writes. (For a
1451 * correct atomic write, we should e.g. take write locks on all
1452 * objects, rollback on failure, etc.)
1453 */
1454 static ssize_t
1455 ceph_sync_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos,
1456 struct ceph_snap_context *snapc)
1457 {
1458 struct file *file = iocb->ki_filp;
1459 struct inode *inode = file_inode(file);
1460 struct ceph_inode_info *ci = ceph_inode(inode);
1461 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1462 struct ceph_vino vino;
1463 struct ceph_osd_request *req;
1464 struct page **pages;
1465 u64 len;
1466 int num_pages;
1467 int written = 0;
1468 int flags;
1469 int ret;
1470 bool check_caps = false;
1471 struct timespec64 mtime = current_time(inode);
1472 size_t count = iov_iter_count(from);
1473
1474 if (ceph_snap(file_inode(file)) != CEPH_NOSNAP)
1475 return -EROFS;
1476
1477 dout("sync_write on file %p %lld~%u snapc %p seq %lld\n",
1478 file, pos, (unsigned)count, snapc, snapc->seq);
1479
1480 ret = filemap_write_and_wait_range(inode->i_mapping,
1481 pos, pos + count - 1);
1482 if (ret < 0)
1483 return ret;
1484
1485 ceph_fscache_invalidate(inode, false);
1486 ret = invalidate_inode_pages2_range(inode->i_mapping,
1487 pos >> PAGE_SHIFT,
1488 (pos + count - 1) >> PAGE_SHIFT);
1489 if (ret < 0)
1490 dout("invalidate_inode_pages2_range returned %d\n", ret);
1491
1492 flags = /* CEPH_OSD_FLAG_ORDERSNAP | */ CEPH_OSD_FLAG_WRITE;
1493
1494 while ((len = iov_iter_count(from)) > 0) {
1495 size_t left;
1496 int n;
1497
1498 vino = ceph_vino(inode);
1499 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1500 vino, pos, &len, 0, 1,
1501 CEPH_OSD_OP_WRITE, flags, snapc,
1502 ci->i_truncate_seq,
1503 ci->i_truncate_size,
1504 false);
1505 if (IS_ERR(req)) {
1506 ret = PTR_ERR(req);
1507 break;
1508 }
1509
1510 /*
1511 * write from beginning of first page,
1512 * regardless of io alignment
1513 */
1514 num_pages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
1515
1516 pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL);
1517 if (IS_ERR(pages)) {
1518 ret = PTR_ERR(pages);
1519 goto out;
1520 }
1521
1522 left = len;
1523 for (n = 0; n < num_pages; n++) {
1524 size_t plen = min_t(size_t, left, PAGE_SIZE);
1525 ret = copy_page_from_iter(pages[n], 0, plen, from);
1526 if (ret != plen) {
1527 ret = -EFAULT;
1528 break;
1529 }
1530 left -= ret;
1531 }
1532
1533 if (ret < 0) {
1534 ceph_release_page_vector(pages, num_pages);
1535 goto out;
1536 }
1537
1538 req->r_inode = inode;
1539
1540 osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0,
1541 false, true);
1542
1543 req->r_mtime = mtime;
1544 ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
1545 if (!ret)
1546 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
1547
1548 ceph_update_write_metrics(&fsc->mdsc->metric, req->r_start_latency,
1549 req->r_end_latency, len, ret);
1550 out:
1551 ceph_osdc_put_request(req);
1552 if (ret != 0) {
1553 ceph_set_error_write(ci);
1554 break;
1555 }
1556
1557 ceph_clear_error_write(ci);
1558 pos += len;
1559 written += len;
1560 if (pos > i_size_read(inode)) {
1561 check_caps = ceph_inode_set_size(inode, pos);
1562 if (check_caps)
1563 ceph_check_caps(ceph_inode(inode),
1564 CHECK_CAPS_AUTHONLY,
1565 NULL);
1566 }
1567
1568 }
1569
1570 if (ret != -EOLDSNAPC && written > 0) {
1571 ret = written;
1572 iocb->ki_pos = pos;
1573 }
1574 return ret;
1575 }
1576
1577 /*
1578 * Wrap generic_file_aio_read with checks for cap bits on the inode.
1579 * Atomically grab references, so that those bits are not released
1580 * back to the MDS mid-read.
1581 *
1582 * Hmm, the sync read case isn't actually async... should it be?
1583 */
1584 static ssize_t ceph_read_iter(struct kiocb *iocb, struct iov_iter *to)
1585 {
1586 struct file *filp = iocb->ki_filp;
1587 struct ceph_file_info *fi = filp->private_data;
1588 size_t len = iov_iter_count(to);
1589 struct inode *inode = file_inode(filp);
1590 struct ceph_inode_info *ci = ceph_inode(inode);
1591 bool direct_lock = iocb->ki_flags & IOCB_DIRECT;
1592 ssize_t ret;
1593 int want = 0, got = 0;
1594 int retry_op = 0, read = 0;
1595
1596 again:
1597 dout("aio_read %p %llx.%llx %llu~%u trying to get caps on %p\n",
1598 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len, inode);
1599
1600 if (ceph_inode_is_shutdown(inode))
1601 return -ESTALE;
1602
1603 if (direct_lock)
1604 ceph_start_io_direct(inode);
1605 else
1606 ceph_start_io_read(inode);
1607
1608 if (!(fi->flags & CEPH_F_SYNC) && !direct_lock)
1609 want |= CEPH_CAP_FILE_CACHE;
1610 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1611 want |= CEPH_CAP_FILE_LAZYIO;
1612
1613 ret = ceph_get_caps(filp, CEPH_CAP_FILE_RD, want, -1, &got);
1614 if (ret < 0) {
1615 if (direct_lock)
1616 ceph_end_io_direct(inode);
1617 else
1618 ceph_end_io_read(inode);
1619 return ret;
1620 }
1621
1622 if ((got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0 ||
1623 (iocb->ki_flags & IOCB_DIRECT) ||
1624 (fi->flags & CEPH_F_SYNC)) {
1625
1626 dout("aio_sync_read %p %llx.%llx %llu~%u got cap refs on %s\n",
1627 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
1628 ceph_cap_string(got));
1629
1630 if (ci->i_inline_version == CEPH_INLINE_NONE) {
1631 if (!retry_op && (iocb->ki_flags & IOCB_DIRECT)) {
1632 ret = ceph_direct_read_write(iocb, to,
1633 NULL, NULL);
1634 if (ret >= 0 && ret < len)
1635 retry_op = CHECK_EOF;
1636 } else {
1637 ret = ceph_sync_read(iocb, to, &retry_op);
1638 }
1639 } else {
1640 retry_op = READ_INLINE;
1641 }
1642 } else {
1643 CEPH_DEFINE_RW_CONTEXT(rw_ctx, got);
1644 dout("aio_read %p %llx.%llx %llu~%u got cap refs on %s\n",
1645 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
1646 ceph_cap_string(got));
1647 ceph_add_rw_context(fi, &rw_ctx);
1648 ret = generic_file_read_iter(iocb, to);
1649 ceph_del_rw_context(fi, &rw_ctx);
1650 }
1651
1652 dout("aio_read %p %llx.%llx dropping cap refs on %s = %d\n",
1653 inode, ceph_vinop(inode), ceph_cap_string(got), (int)ret);
1654 ceph_put_cap_refs(ci, got);
1655
1656 if (direct_lock)
1657 ceph_end_io_direct(inode);
1658 else
1659 ceph_end_io_read(inode);
1660
1661 if (retry_op > HAVE_RETRIED && ret >= 0) {
1662 int statret;
1663 struct page *page = NULL;
1664 loff_t i_size;
1665 if (retry_op == READ_INLINE) {
1666 page = __page_cache_alloc(GFP_KERNEL);
1667 if (!page)
1668 return -ENOMEM;
1669 }
1670
1671 statret = __ceph_do_getattr(inode, page,
1672 CEPH_STAT_CAP_INLINE_DATA, !!page);
1673 if (statret < 0) {
1674 if (page)
1675 __free_page(page);
1676 if (statret == -ENODATA) {
1677 BUG_ON(retry_op != READ_INLINE);
1678 goto again;
1679 }
1680 return statret;
1681 }
1682
1683 i_size = i_size_read(inode);
1684 if (retry_op == READ_INLINE) {
1685 BUG_ON(ret > 0 || read > 0);
1686 if (iocb->ki_pos < i_size &&
1687 iocb->ki_pos < PAGE_SIZE) {
1688 loff_t end = min_t(loff_t, i_size,
1689 iocb->ki_pos + len);
1690 end = min_t(loff_t, end, PAGE_SIZE);
1691 if (statret < end)
1692 zero_user_segment(page, statret, end);
1693 ret = copy_page_to_iter(page,
1694 iocb->ki_pos & ~PAGE_MASK,
1695 end - iocb->ki_pos, to);
1696 iocb->ki_pos += ret;
1697 read += ret;
1698 }
1699 if (iocb->ki_pos < i_size && read < len) {
1700 size_t zlen = min_t(size_t, len - read,
1701 i_size - iocb->ki_pos);
1702 ret = iov_iter_zero(zlen, to);
1703 iocb->ki_pos += ret;
1704 read += ret;
1705 }
1706 __free_pages(page, 0);
1707 return read;
1708 }
1709
1710 /* hit EOF or hole? */
1711 if (retry_op == CHECK_EOF && iocb->ki_pos < i_size &&
1712 ret < len) {
1713 dout("sync_read hit hole, ppos %lld < size %lld"
1714 ", reading more\n", iocb->ki_pos, i_size);
1715
1716 read += ret;
1717 len -= ret;
1718 retry_op = HAVE_RETRIED;
1719 goto again;
1720 }
1721 }
1722
1723 if (ret >= 0)
1724 ret += read;
1725
1726 return ret;
1727 }
1728
1729 /*
1730 * Take cap references to avoid releasing caps to MDS mid-write.
1731 *
1732 * If we are synchronous, and write with an old snap context, the OSD
1733 * may return EOLDSNAPC. In that case, retry the write.. _after_
1734 * dropping our cap refs and allowing the pending snap to logically
1735 * complete _before_ this write occurs.
1736 *
1737 * If we are near ENOSPC, write synchronously.
1738 */
1739 static ssize_t ceph_write_iter(struct kiocb *iocb, struct iov_iter *from)
1740 {
1741 struct file *file = iocb->ki_filp;
1742 struct ceph_file_info *fi = file->private_data;
1743 struct inode *inode = file_inode(file);
1744 struct ceph_inode_info *ci = ceph_inode(inode);
1745 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1746 struct ceph_osd_client *osdc = &fsc->client->osdc;
1747 struct ceph_cap_flush *prealloc_cf;
1748 ssize_t count, written = 0;
1749 int err, want = 0, got;
1750 bool direct_lock = false;
1751 u32 map_flags;
1752 u64 pool_flags;
1753 loff_t pos;
1754 loff_t limit = max(i_size_read(inode), fsc->max_file_size);
1755
1756 if (ceph_inode_is_shutdown(inode))
1757 return -ESTALE;
1758
1759 if (ceph_snap(inode) != CEPH_NOSNAP)
1760 return -EROFS;
1761
1762 prealloc_cf = ceph_alloc_cap_flush();
1763 if (!prealloc_cf)
1764 return -ENOMEM;
1765
1766 if ((iocb->ki_flags & (IOCB_DIRECT | IOCB_APPEND)) == IOCB_DIRECT)
1767 direct_lock = true;
1768
1769 retry_snap:
1770 if (direct_lock)
1771 ceph_start_io_direct(inode);
1772 else
1773 ceph_start_io_write(inode);
1774
1775 /* We can write back this queue in page reclaim */
1776 current->backing_dev_info = inode_to_bdi(inode);
1777
1778 if (iocb->ki_flags & IOCB_APPEND) {
1779 err = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false);
1780 if (err < 0)
1781 goto out;
1782 }
1783
1784 err = generic_write_checks(iocb, from);
1785 if (err <= 0)
1786 goto out;
1787
1788 pos = iocb->ki_pos;
1789 if (unlikely(pos >= limit)) {
1790 err = -EFBIG;
1791 goto out;
1792 } else {
1793 iov_iter_truncate(from, limit - pos);
1794 }
1795
1796 count = iov_iter_count(from);
1797 if (ceph_quota_is_max_bytes_exceeded(inode, pos + count)) {
1798 err = -EDQUOT;
1799 goto out;
1800 }
1801
1802 down_read(&osdc->lock);
1803 map_flags = osdc->osdmap->flags;
1804 pool_flags = ceph_pg_pool_flags(osdc->osdmap, ci->i_layout.pool_id);
1805 up_read(&osdc->lock);
1806 if ((map_flags & CEPH_OSDMAP_FULL) ||
1807 (pool_flags & CEPH_POOL_FLAG_FULL)) {
1808 err = -ENOSPC;
1809 goto out;
1810 }
1811
1812 err = file_remove_privs(file);
1813 if (err)
1814 goto out;
1815
1816 dout("aio_write %p %llx.%llx %llu~%zd getting caps. i_size %llu\n",
1817 inode, ceph_vinop(inode), pos, count, i_size_read(inode));
1818 if (!(fi->flags & CEPH_F_SYNC) && !direct_lock)
1819 want |= CEPH_CAP_FILE_BUFFER;
1820 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1821 want |= CEPH_CAP_FILE_LAZYIO;
1822 got = 0;
1823 err = ceph_get_caps(file, CEPH_CAP_FILE_WR, want, pos + count, &got);
1824 if (err < 0)
1825 goto out;
1826
1827 err = file_update_time(file);
1828 if (err)
1829 goto out_caps;
1830
1831 inode_inc_iversion_raw(inode);
1832
1833 dout("aio_write %p %llx.%llx %llu~%zd got cap refs on %s\n",
1834 inode, ceph_vinop(inode), pos, count, ceph_cap_string(got));
1835
1836 if ((got & (CEPH_CAP_FILE_BUFFER|CEPH_CAP_FILE_LAZYIO)) == 0 ||
1837 (iocb->ki_flags & IOCB_DIRECT) || (fi->flags & CEPH_F_SYNC) ||
1838 (ci->i_ceph_flags & CEPH_I_ERROR_WRITE)) {
1839 struct ceph_snap_context *snapc;
1840 struct iov_iter data;
1841
1842 spin_lock(&ci->i_ceph_lock);
1843 if (__ceph_have_pending_cap_snap(ci)) {
1844 struct ceph_cap_snap *capsnap =
1845 list_last_entry(&ci->i_cap_snaps,
1846 struct ceph_cap_snap,
1847 ci_item);
1848 snapc = ceph_get_snap_context(capsnap->context);
1849 } else {
1850 BUG_ON(!ci->i_head_snapc);
1851 snapc = ceph_get_snap_context(ci->i_head_snapc);
1852 }
1853 spin_unlock(&ci->i_ceph_lock);
1854
1855 /* we might need to revert back to that point */
1856 data = *from;
1857 if (iocb->ki_flags & IOCB_DIRECT)
1858 written = ceph_direct_read_write(iocb, &data, snapc,
1859 &prealloc_cf);
1860 else
1861 written = ceph_sync_write(iocb, &data, pos, snapc);
1862 if (direct_lock)
1863 ceph_end_io_direct(inode);
1864 else
1865 ceph_end_io_write(inode);
1866 if (written > 0)
1867 iov_iter_advance(from, written);
1868 ceph_put_snap_context(snapc);
1869 } else {
1870 /*
1871 * No need to acquire the i_truncate_mutex. Because
1872 * the MDS revokes Fwb caps before sending truncate
1873 * message to us. We can't get Fwb cap while there
1874 * are pending vmtruncate. So write and vmtruncate
1875 * can not run at the same time
1876 */
1877 written = generic_perform_write(iocb, from);
1878 if (likely(written >= 0))
1879 iocb->ki_pos = pos + written;
1880 ceph_end_io_write(inode);
1881 }
1882
1883 if (written >= 0) {
1884 int dirty;
1885
1886 spin_lock(&ci->i_ceph_lock);
1887 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
1888 &prealloc_cf);
1889 spin_unlock(&ci->i_ceph_lock);
1890 if (dirty)
1891 __mark_inode_dirty(inode, dirty);
1892 if (ceph_quota_is_max_bytes_approaching(inode, iocb->ki_pos))
1893 ceph_check_caps(ci, 0, NULL);
1894 }
1895
1896 dout("aio_write %p %llx.%llx %llu~%u dropping cap refs on %s\n",
1897 inode, ceph_vinop(inode), pos, (unsigned)count,
1898 ceph_cap_string(got));
1899 ceph_put_cap_refs(ci, got);
1900
1901 if (written == -EOLDSNAPC) {
1902 dout("aio_write %p %llx.%llx %llu~%u" "got EOLDSNAPC, retrying\n",
1903 inode, ceph_vinop(inode), pos, (unsigned)count);
1904 goto retry_snap;
1905 }
1906
1907 if (written >= 0) {
1908 if ((map_flags & CEPH_OSDMAP_NEARFULL) ||
1909 (pool_flags & CEPH_POOL_FLAG_NEARFULL))
1910 iocb->ki_flags |= IOCB_DSYNC;
1911 written = generic_write_sync(iocb, written);
1912 }
1913
1914 goto out_unlocked;
1915 out_caps:
1916 ceph_put_cap_refs(ci, got);
1917 out:
1918 if (direct_lock)
1919 ceph_end_io_direct(inode);
1920 else
1921 ceph_end_io_write(inode);
1922 out_unlocked:
1923 ceph_free_cap_flush(prealloc_cf);
1924 current->backing_dev_info = NULL;
1925 return written ? written : err;
1926 }
1927
1928 /*
1929 * llseek. be sure to verify file size on SEEK_END.
1930 */
1931 static loff_t ceph_llseek(struct file *file, loff_t offset, int whence)
1932 {
1933 struct inode *inode = file->f_mapping->host;
1934 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1935 loff_t i_size;
1936 loff_t ret;
1937
1938 inode_lock(inode);
1939
1940 if (whence == SEEK_END || whence == SEEK_DATA || whence == SEEK_HOLE) {
1941 ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false);
1942 if (ret < 0)
1943 goto out;
1944 }
1945
1946 i_size = i_size_read(inode);
1947 switch (whence) {
1948 case SEEK_END:
1949 offset += i_size;
1950 break;
1951 case SEEK_CUR:
1952 /*
1953 * Here we special-case the lseek(fd, 0, SEEK_CUR)
1954 * position-querying operation. Avoid rewriting the "same"
1955 * f_pos value back to the file because a concurrent read(),
1956 * write() or lseek() might have altered it
1957 */
1958 if (offset == 0) {
1959 ret = file->f_pos;
1960 goto out;
1961 }
1962 offset += file->f_pos;
1963 break;
1964 case SEEK_DATA:
1965 if (offset < 0 || offset >= i_size) {
1966 ret = -ENXIO;
1967 goto out;
1968 }
1969 break;
1970 case SEEK_HOLE:
1971 if (offset < 0 || offset >= i_size) {
1972 ret = -ENXIO;
1973 goto out;
1974 }
1975 offset = i_size;
1976 break;
1977 }
1978
1979 ret = vfs_setpos(file, offset, max(i_size, fsc->max_file_size));
1980
1981 out:
1982 inode_unlock(inode);
1983 return ret;
1984 }
1985
1986 static inline void ceph_zero_partial_page(
1987 struct inode *inode, loff_t offset, unsigned size)
1988 {
1989 struct page *page;
1990 pgoff_t index = offset >> PAGE_SHIFT;
1991
1992 page = find_lock_page(inode->i_mapping, index);
1993 if (page) {
1994 wait_on_page_writeback(page);
1995 zero_user(page, offset & (PAGE_SIZE - 1), size);
1996 unlock_page(page);
1997 put_page(page);
1998 }
1999 }
2000
2001 static void ceph_zero_pagecache_range(struct inode *inode, loff_t offset,
2002 loff_t length)
2003 {
2004 loff_t nearly = round_up(offset, PAGE_SIZE);
2005 if (offset < nearly) {
2006 loff_t size = nearly - offset;
2007 if (length < size)
2008 size = length;
2009 ceph_zero_partial_page(inode, offset, size);
2010 offset += size;
2011 length -= size;
2012 }
2013 if (length >= PAGE_SIZE) {
2014 loff_t size = round_down(length, PAGE_SIZE);
2015 truncate_pagecache_range(inode, offset, offset + size - 1);
2016 offset += size;
2017 length -= size;
2018 }
2019 if (length)
2020 ceph_zero_partial_page(inode, offset, length);
2021 }
2022
2023 static int ceph_zero_partial_object(struct inode *inode,
2024 loff_t offset, loff_t *length)
2025 {
2026 struct ceph_inode_info *ci = ceph_inode(inode);
2027 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
2028 struct ceph_osd_request *req;
2029 int ret = 0;
2030 loff_t zero = 0;
2031 int op;
2032
2033 if (!length) {
2034 op = offset ? CEPH_OSD_OP_DELETE : CEPH_OSD_OP_TRUNCATE;
2035 length = &zero;
2036 } else {
2037 op = CEPH_OSD_OP_ZERO;
2038 }
2039
2040 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
2041 ceph_vino(inode),
2042 offset, length,
2043 0, 1, op,
2044 CEPH_OSD_FLAG_WRITE,
2045 NULL, 0, 0, false);
2046 if (IS_ERR(req)) {
2047 ret = PTR_ERR(req);
2048 goto out;
2049 }
2050
2051 req->r_mtime = inode->i_mtime;
2052 ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
2053 if (!ret) {
2054 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
2055 if (ret == -ENOENT)
2056 ret = 0;
2057 }
2058 ceph_osdc_put_request(req);
2059
2060 out:
2061 return ret;
2062 }
2063
2064 static int ceph_zero_objects(struct inode *inode, loff_t offset, loff_t length)
2065 {
2066 int ret = 0;
2067 struct ceph_inode_info *ci = ceph_inode(inode);
2068 s32 stripe_unit = ci->i_layout.stripe_unit;
2069 s32 stripe_count = ci->i_layout.stripe_count;
2070 s32 object_size = ci->i_layout.object_size;
2071 u64 object_set_size = object_size * stripe_count;
2072 u64 nearly, t;
2073
2074 /* round offset up to next period boundary */
2075 nearly = offset + object_set_size - 1;
2076 t = nearly;
2077 nearly -= do_div(t, object_set_size);
2078
2079 while (length && offset < nearly) {
2080 loff_t size = length;
2081 ret = ceph_zero_partial_object(inode, offset, &size);
2082 if (ret < 0)
2083 return ret;
2084 offset += size;
2085 length -= size;
2086 }
2087 while (length >= object_set_size) {
2088 int i;
2089 loff_t pos = offset;
2090 for (i = 0; i < stripe_count; ++i) {
2091 ret = ceph_zero_partial_object(inode, pos, NULL);
2092 if (ret < 0)
2093 return ret;
2094 pos += stripe_unit;
2095 }
2096 offset += object_set_size;
2097 length -= object_set_size;
2098 }
2099 while (length) {
2100 loff_t size = length;
2101 ret = ceph_zero_partial_object(inode, offset, &size);
2102 if (ret < 0)
2103 return ret;
2104 offset += size;
2105 length -= size;
2106 }
2107 return ret;
2108 }
2109
2110 static long ceph_fallocate(struct file *file, int mode,
2111 loff_t offset, loff_t length)
2112 {
2113 struct ceph_file_info *fi = file->private_data;
2114 struct inode *inode = file_inode(file);
2115 struct ceph_inode_info *ci = ceph_inode(inode);
2116 struct ceph_cap_flush *prealloc_cf;
2117 int want, got = 0;
2118 int dirty;
2119 int ret = 0;
2120 loff_t endoff = 0;
2121 loff_t size;
2122
2123 if (mode != (FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
2124 return -EOPNOTSUPP;
2125
2126 if (!S_ISREG(inode->i_mode))
2127 return -EOPNOTSUPP;
2128
2129 prealloc_cf = ceph_alloc_cap_flush();
2130 if (!prealloc_cf)
2131 return -ENOMEM;
2132
2133 inode_lock(inode);
2134
2135 if (ceph_snap(inode) != CEPH_NOSNAP) {
2136 ret = -EROFS;
2137 goto unlock;
2138 }
2139
2140 size = i_size_read(inode);
2141
2142 /* Are we punching a hole beyond EOF? */
2143 if (offset >= size)
2144 goto unlock;
2145 if ((offset + length) > size)
2146 length = size - offset;
2147
2148 if (fi->fmode & CEPH_FILE_MODE_LAZY)
2149 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
2150 else
2151 want = CEPH_CAP_FILE_BUFFER;
2152
2153 ret = ceph_get_caps(file, CEPH_CAP_FILE_WR, want, endoff, &got);
2154 if (ret < 0)
2155 goto unlock;
2156
2157 filemap_invalidate_lock(inode->i_mapping);
2158 ceph_fscache_invalidate(inode, false);
2159 ceph_zero_pagecache_range(inode, offset, length);
2160 ret = ceph_zero_objects(inode, offset, length);
2161
2162 if (!ret) {
2163 spin_lock(&ci->i_ceph_lock);
2164 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
2165 &prealloc_cf);
2166 spin_unlock(&ci->i_ceph_lock);
2167 if (dirty)
2168 __mark_inode_dirty(inode, dirty);
2169 }
2170 filemap_invalidate_unlock(inode->i_mapping);
2171
2172 ceph_put_cap_refs(ci, got);
2173 unlock:
2174 inode_unlock(inode);
2175 ceph_free_cap_flush(prealloc_cf);
2176 return ret;
2177 }
2178
2179 /*
2180 * This function tries to get FILE_WR capabilities for dst_ci and FILE_RD for
2181 * src_ci. Two attempts are made to obtain both caps, and an error is return if
2182 * this fails; zero is returned on success.
2183 */
2184 static int get_rd_wr_caps(struct file *src_filp, int *src_got,
2185 struct file *dst_filp,
2186 loff_t dst_endoff, int *dst_got)
2187 {
2188 int ret = 0;
2189 bool retrying = false;
2190
2191 retry_caps:
2192 ret = ceph_get_caps(dst_filp, CEPH_CAP_FILE_WR, CEPH_CAP_FILE_BUFFER,
2193 dst_endoff, dst_got);
2194 if (ret < 0)
2195 return ret;
2196
2197 /*
2198 * Since we're already holding the FILE_WR capability for the dst file,
2199 * we would risk a deadlock by using ceph_get_caps. Thus, we'll do some
2200 * retry dance instead to try to get both capabilities.
2201 */
2202 ret = ceph_try_get_caps(file_inode(src_filp),
2203 CEPH_CAP_FILE_RD, CEPH_CAP_FILE_SHARED,
2204 false, src_got);
2205 if (ret <= 0) {
2206 /* Start by dropping dst_ci caps and getting src_ci caps */
2207 ceph_put_cap_refs(ceph_inode(file_inode(dst_filp)), *dst_got);
2208 if (retrying) {
2209 if (!ret)
2210 /* ceph_try_get_caps masks EAGAIN */
2211 ret = -EAGAIN;
2212 return ret;
2213 }
2214 ret = ceph_get_caps(src_filp, CEPH_CAP_FILE_RD,
2215 CEPH_CAP_FILE_SHARED, -1, src_got);
2216 if (ret < 0)
2217 return ret;
2218 /*... drop src_ci caps too, and retry */
2219 ceph_put_cap_refs(ceph_inode(file_inode(src_filp)), *src_got);
2220 retrying = true;
2221 goto retry_caps;
2222 }
2223 return ret;
2224 }
2225
2226 static void put_rd_wr_caps(struct ceph_inode_info *src_ci, int src_got,
2227 struct ceph_inode_info *dst_ci, int dst_got)
2228 {
2229 ceph_put_cap_refs(src_ci, src_got);
2230 ceph_put_cap_refs(dst_ci, dst_got);
2231 }
2232
2233 /*
2234 * This function does several size-related checks, returning an error if:
2235 * - source file is smaller than off+len
2236 * - destination file size is not OK (inode_newsize_ok())
2237 * - max bytes quotas is exceeded
2238 */
2239 static int is_file_size_ok(struct inode *src_inode, struct inode *dst_inode,
2240 loff_t src_off, loff_t dst_off, size_t len)
2241 {
2242 loff_t size, endoff;
2243
2244 size = i_size_read(src_inode);
2245 /*
2246 * Don't copy beyond source file EOF. Instead of simply setting length
2247 * to (size - src_off), just drop to VFS default implementation, as the
2248 * local i_size may be stale due to other clients writing to the source
2249 * inode.
2250 */
2251 if (src_off + len > size) {
2252 dout("Copy beyond EOF (%llu + %zu > %llu)\n",
2253 src_off, len, size);
2254 return -EOPNOTSUPP;
2255 }
2256 size = i_size_read(dst_inode);
2257
2258 endoff = dst_off + len;
2259 if (inode_newsize_ok(dst_inode, endoff))
2260 return -EOPNOTSUPP;
2261
2262 if (ceph_quota_is_max_bytes_exceeded(dst_inode, endoff))
2263 return -EDQUOT;
2264
2265 return 0;
2266 }
2267
2268 static struct ceph_osd_request *
2269 ceph_alloc_copyfrom_request(struct ceph_osd_client *osdc,
2270 u64 src_snapid,
2271 struct ceph_object_id *src_oid,
2272 struct ceph_object_locator *src_oloc,
2273 struct ceph_object_id *dst_oid,
2274 struct ceph_object_locator *dst_oloc,
2275 u32 truncate_seq, u64 truncate_size)
2276 {
2277 struct ceph_osd_request *req;
2278 int ret;
2279 u32 src_fadvise_flags =
2280 CEPH_OSD_OP_FLAG_FADVISE_SEQUENTIAL |
2281 CEPH_OSD_OP_FLAG_FADVISE_NOCACHE;
2282 u32 dst_fadvise_flags =
2283 CEPH_OSD_OP_FLAG_FADVISE_SEQUENTIAL |
2284 CEPH_OSD_OP_FLAG_FADVISE_DONTNEED;
2285
2286 req = ceph_osdc_alloc_request(osdc, NULL, 1, false, GFP_KERNEL);
2287 if (!req)
2288 return ERR_PTR(-ENOMEM);
2289
2290 req->r_flags = CEPH_OSD_FLAG_WRITE;
2291
2292 ceph_oloc_copy(&req->r_t.base_oloc, dst_oloc);
2293 ceph_oid_copy(&req->r_t.base_oid, dst_oid);
2294
2295 ret = osd_req_op_copy_from_init(req, src_snapid, 0,
2296 src_oid, src_oloc,
2297 src_fadvise_flags,
2298 dst_fadvise_flags,
2299 truncate_seq,
2300 truncate_size,
2301 CEPH_OSD_COPY_FROM_FLAG_TRUNCATE_SEQ);
2302 if (ret)
2303 goto out;
2304
2305 ret = ceph_osdc_alloc_messages(req, GFP_KERNEL);
2306 if (ret)
2307 goto out;
2308
2309 return req;
2310
2311 out:
2312 ceph_osdc_put_request(req);
2313 return ERR_PTR(ret);
2314 }
2315
2316 static ssize_t ceph_do_objects_copy(struct ceph_inode_info *src_ci, u64 *src_off,
2317 struct ceph_inode_info *dst_ci, u64 *dst_off,
2318 struct ceph_fs_client *fsc,
2319 size_t len, unsigned int flags)
2320 {
2321 struct ceph_object_locator src_oloc, dst_oloc;
2322 struct ceph_object_id src_oid, dst_oid;
2323 struct ceph_osd_client *osdc;
2324 struct ceph_osd_request *req;
2325 size_t bytes = 0;
2326 u64 src_objnum, src_objoff, dst_objnum, dst_objoff;
2327 u32 src_objlen, dst_objlen;
2328 u32 object_size = src_ci->i_layout.object_size;
2329 int ret;
2330
2331 src_oloc.pool = src_ci->i_layout.pool_id;
2332 src_oloc.pool_ns = ceph_try_get_string(src_ci->i_layout.pool_ns);
2333 dst_oloc.pool = dst_ci->i_layout.pool_id;
2334 dst_oloc.pool_ns = ceph_try_get_string(dst_ci->i_layout.pool_ns);
2335 osdc = &fsc->client->osdc;
2336
2337 while (len >= object_size) {
2338 ceph_calc_file_object_mapping(&src_ci->i_layout, *src_off,
2339 object_size, &src_objnum,
2340 &src_objoff, &src_objlen);
2341 ceph_calc_file_object_mapping(&dst_ci->i_layout, *dst_off,
2342 object_size, &dst_objnum,
2343 &dst_objoff, &dst_objlen);
2344 ceph_oid_init(&src_oid);
2345 ceph_oid_printf(&src_oid, "%llx.%08llx",
2346 src_ci->i_vino.ino, src_objnum);
2347 ceph_oid_init(&dst_oid);
2348 ceph_oid_printf(&dst_oid, "%llx.%08llx",
2349 dst_ci->i_vino.ino, dst_objnum);
2350 /* Do an object remote copy */
2351 req = ceph_alloc_copyfrom_request(osdc, src_ci->i_vino.snap,
2352 &src_oid, &src_oloc,
2353 &dst_oid, &dst_oloc,
2354 dst_ci->i_truncate_seq,
2355 dst_ci->i_truncate_size);
2356 if (IS_ERR(req))
2357 ret = PTR_ERR(req);
2358 else {
2359 ceph_osdc_start_request(osdc, req, false);
2360 ret = ceph_osdc_wait_request(osdc, req);
2361 ceph_update_copyfrom_metrics(&fsc->mdsc->metric,
2362 req->r_start_latency,
2363 req->r_end_latency,
2364 object_size, ret);
2365 ceph_osdc_put_request(req);
2366 }
2367 if (ret) {
2368 if (ret == -EOPNOTSUPP) {
2369 fsc->have_copy_from2 = false;
2370 pr_notice("OSDs don't support copy-from2; disabling copy offload\n");
2371 }
2372 dout("ceph_osdc_copy_from returned %d\n", ret);
2373 if (!bytes)
2374 bytes = ret;
2375 goto out;
2376 }
2377 len -= object_size;
2378 bytes += object_size;
2379 *src_off += object_size;
2380 *dst_off += object_size;
2381 }
2382
2383 out:
2384 ceph_oloc_destroy(&src_oloc);
2385 ceph_oloc_destroy(&dst_oloc);
2386 return bytes;
2387 }
2388
2389 static ssize_t __ceph_copy_file_range(struct file *src_file, loff_t src_off,
2390 struct file *dst_file, loff_t dst_off,
2391 size_t len, unsigned int flags)
2392 {
2393 struct inode *src_inode = file_inode(src_file);
2394 struct inode *dst_inode = file_inode(dst_file);
2395 struct ceph_inode_info *src_ci = ceph_inode(src_inode);
2396 struct ceph_inode_info *dst_ci = ceph_inode(dst_inode);
2397 struct ceph_cap_flush *prealloc_cf;
2398 struct ceph_fs_client *src_fsc = ceph_inode_to_client(src_inode);
2399 loff_t size;
2400 ssize_t ret = -EIO, bytes;
2401 u64 src_objnum, dst_objnum, src_objoff, dst_objoff;
2402 u32 src_objlen, dst_objlen;
2403 int src_got = 0, dst_got = 0, err, dirty;
2404
2405 if (src_inode->i_sb != dst_inode->i_sb) {
2406 struct ceph_fs_client *dst_fsc = ceph_inode_to_client(dst_inode);
2407
2408 if (ceph_fsid_compare(&src_fsc->client->fsid,
2409 &dst_fsc->client->fsid)) {
2410 dout("Copying files across clusters: src: %pU dst: %pU\n",
2411 &src_fsc->client->fsid, &dst_fsc->client->fsid);
2412 return -EXDEV;
2413 }
2414 }
2415 if (ceph_snap(dst_inode) != CEPH_NOSNAP)
2416 return -EROFS;
2417
2418 /*
2419 * Some of the checks below will return -EOPNOTSUPP, which will force a
2420 * fallback to the default VFS copy_file_range implementation. This is
2421 * desirable in several cases (for ex, the 'len' is smaller than the
2422 * size of the objects, or in cases where that would be more
2423 * efficient).
2424 */
2425
2426 if (ceph_test_mount_opt(src_fsc, NOCOPYFROM))
2427 return -EOPNOTSUPP;
2428
2429 if (!src_fsc->have_copy_from2)
2430 return -EOPNOTSUPP;
2431
2432 /*
2433 * Striped file layouts require that we copy partial objects, but the
2434 * OSD copy-from operation only supports full-object copies. Limit
2435 * this to non-striped file layouts for now.
2436 */
2437 if ((src_ci->i_layout.stripe_unit != dst_ci->i_layout.stripe_unit) ||
2438 (src_ci->i_layout.stripe_count != 1) ||
2439 (dst_ci->i_layout.stripe_count != 1) ||
2440 (src_ci->i_layout.object_size != dst_ci->i_layout.object_size)) {
2441 dout("Invalid src/dst files layout\n");
2442 return -EOPNOTSUPP;
2443 }
2444
2445 if (len < src_ci->i_layout.object_size)
2446 return -EOPNOTSUPP; /* no remote copy will be done */
2447
2448 prealloc_cf = ceph_alloc_cap_flush();
2449 if (!prealloc_cf)
2450 return -ENOMEM;
2451
2452 /* Start by sync'ing the source and destination files */
2453 ret = file_write_and_wait_range(src_file, src_off, (src_off + len));
2454 if (ret < 0) {
2455 dout("failed to write src file (%zd)\n", ret);
2456 goto out;
2457 }
2458 ret = file_write_and_wait_range(dst_file, dst_off, (dst_off + len));
2459 if (ret < 0) {
2460 dout("failed to write dst file (%zd)\n", ret);
2461 goto out;
2462 }
2463
2464 /*
2465 * We need FILE_WR caps for dst_ci and FILE_RD for src_ci as other
2466 * clients may have dirty data in their caches. And OSDs know nothing
2467 * about caps, so they can't safely do the remote object copies.
2468 */
2469 err = get_rd_wr_caps(src_file, &src_got,
2470 dst_file, (dst_off + len), &dst_got);
2471 if (err < 0) {
2472 dout("get_rd_wr_caps returned %d\n", err);
2473 ret = -EOPNOTSUPP;
2474 goto out;
2475 }
2476
2477 ret = is_file_size_ok(src_inode, dst_inode, src_off, dst_off, len);
2478 if (ret < 0)
2479 goto out_caps;
2480
2481 /* Drop dst file cached pages */
2482 ceph_fscache_invalidate(dst_inode, false);
2483 ret = invalidate_inode_pages2_range(dst_inode->i_mapping,
2484 dst_off >> PAGE_SHIFT,
2485 (dst_off + len) >> PAGE_SHIFT);
2486 if (ret < 0) {
2487 dout("Failed to invalidate inode pages (%zd)\n", ret);
2488 ret = 0; /* XXX */
2489 }
2490 ceph_calc_file_object_mapping(&src_ci->i_layout, src_off,
2491 src_ci->i_layout.object_size,
2492 &src_objnum, &src_objoff, &src_objlen);
2493 ceph_calc_file_object_mapping(&dst_ci->i_layout, dst_off,
2494 dst_ci->i_layout.object_size,
2495 &dst_objnum, &dst_objoff, &dst_objlen);
2496 /* object-level offsets need to the same */
2497 if (src_objoff != dst_objoff) {
2498 ret = -EOPNOTSUPP;
2499 goto out_caps;
2500 }
2501
2502 /*
2503 * Do a manual copy if the object offset isn't object aligned.
2504 * 'src_objlen' contains the bytes left until the end of the object,
2505 * starting at the src_off
2506 */
2507 if (src_objoff) {
2508 dout("Initial partial copy of %u bytes\n", src_objlen);
2509
2510 /*
2511 * we need to temporarily drop all caps as we'll be calling
2512 * {read,write}_iter, which will get caps again.
2513 */
2514 put_rd_wr_caps(src_ci, src_got, dst_ci, dst_got);
2515 ret = do_splice_direct(src_file, &src_off, dst_file,
2516 &dst_off, src_objlen, flags);
2517 /* Abort on short copies or on error */
2518 if (ret < src_objlen) {
2519 dout("Failed partial copy (%zd)\n", ret);
2520 goto out;
2521 }
2522 len -= ret;
2523 err = get_rd_wr_caps(src_file, &src_got,
2524 dst_file, (dst_off + len), &dst_got);
2525 if (err < 0)
2526 goto out;
2527 err = is_file_size_ok(src_inode, dst_inode,
2528 src_off, dst_off, len);
2529 if (err < 0)
2530 goto out_caps;
2531 }
2532
2533 size = i_size_read(dst_inode);
2534 bytes = ceph_do_objects_copy(src_ci, &src_off, dst_ci, &dst_off,
2535 src_fsc, len, flags);
2536 if (bytes <= 0) {
2537 if (!ret)
2538 ret = bytes;
2539 goto out_caps;
2540 }
2541 dout("Copied %zu bytes out of %zu\n", bytes, len);
2542 len -= bytes;
2543 ret += bytes;
2544
2545 file_update_time(dst_file);
2546 inode_inc_iversion_raw(dst_inode);
2547
2548 if (dst_off > size) {
2549 /* Let the MDS know about dst file size change */
2550 if (ceph_inode_set_size(dst_inode, dst_off) ||
2551 ceph_quota_is_max_bytes_approaching(dst_inode, dst_off))
2552 ceph_check_caps(dst_ci, CHECK_CAPS_AUTHONLY, NULL);
2553 }
2554 /* Mark Fw dirty */
2555 spin_lock(&dst_ci->i_ceph_lock);
2556 dirty = __ceph_mark_dirty_caps(dst_ci, CEPH_CAP_FILE_WR, &prealloc_cf);
2557 spin_unlock(&dst_ci->i_ceph_lock);
2558 if (dirty)
2559 __mark_inode_dirty(dst_inode, dirty);
2560
2561 out_caps:
2562 put_rd_wr_caps(src_ci, src_got, dst_ci, dst_got);
2563
2564 /*
2565 * Do the final manual copy if we still have some bytes left, unless
2566 * there were errors in remote object copies (len >= object_size).
2567 */
2568 if (len && (len < src_ci->i_layout.object_size)) {
2569 dout("Final partial copy of %zu bytes\n", len);
2570 bytes = do_splice_direct(src_file, &src_off, dst_file,
2571 &dst_off, len, flags);
2572 if (bytes > 0)
2573 ret += bytes;
2574 else
2575 dout("Failed partial copy (%zd)\n", bytes);
2576 }
2577
2578 out:
2579 ceph_free_cap_flush(prealloc_cf);
2580
2581 return ret;
2582 }
2583
2584 static ssize_t ceph_copy_file_range(struct file *src_file, loff_t src_off,
2585 struct file *dst_file, loff_t dst_off,
2586 size_t len, unsigned int flags)
2587 {
2588 ssize_t ret;
2589
2590 ret = __ceph_copy_file_range(src_file, src_off, dst_file, dst_off,
2591 len, flags);
2592
2593 if (ret == -EOPNOTSUPP || ret == -EXDEV)
2594 ret = generic_copy_file_range(src_file, src_off, dst_file,
2595 dst_off, len, flags);
2596 return ret;
2597 }
2598
2599 const struct file_operations ceph_file_fops = {
2600 .open = ceph_open,
2601 .release = ceph_release,
2602 .llseek = ceph_llseek,
2603 .read_iter = ceph_read_iter,
2604 .write_iter = ceph_write_iter,
2605 .mmap = ceph_mmap,
2606 .fsync = ceph_fsync,
2607 .lock = ceph_lock,
2608 .setlease = simple_nosetlease,
2609 .flock = ceph_flock,
2610 .splice_read = generic_file_splice_read,
2611 .splice_write = iter_file_splice_write,
2612 .unlocked_ioctl = ceph_ioctl,
2613 .compat_ioctl = compat_ptr_ioctl,
2614 .fallocate = ceph_fallocate,
2615 .copy_file_range = ceph_copy_file_range,
2616 };
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