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gpio: rcar: Fix runtime PM imbalance on error
[linux/fpc-iii.git] / fs / ceph / file.c
blob4a5ccbb7e808e40800f4133f898cece536a908b5
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
15 #include "super.h"
16 #include "mds_client.h"
17 #include "cache.h"
18 #include "io.h"
19
20 static __le32 ceph_flags_sys2wire(u32 flags)
21 {
22 u32 wire_flags = 0;
23
24 switch (flags & O_ACCMODE) {
25 case O_RDONLY:
26 wire_flags |= CEPH_O_RDONLY;
27 break;
28 case O_WRONLY:
29 wire_flags |= CEPH_O_WRONLY;
30 break;
31 case O_RDWR:
32 wire_flags |= CEPH_O_RDWR;
33 break;
34 }
35
36 flags &= ~O_ACCMODE;
37
38 #define ceph_sys2wire(a) if (flags & a) { wire_flags |= CEPH_##a; flags &= ~a; }
39
40 ceph_sys2wire(O_CREAT);
41 ceph_sys2wire(O_EXCL);
42 ceph_sys2wire(O_TRUNC);
43 ceph_sys2wire(O_DIRECTORY);
44 ceph_sys2wire(O_NOFOLLOW);
45
46 #undef ceph_sys2wire
47
48 if (flags)
49 dout("unused open flags: %x\n", flags);
50
51 return cpu_to_le32(wire_flags);
52 }
53
54 /*
55 * Ceph file operations
56 *
57 * Implement basic open/close functionality, and implement
58 * read/write.
59 *
60 * We implement three modes of file I/O:
61 * - buffered uses the generic_file_aio_{read,write} helpers
62 *
63 * - synchronous is used when there is multi-client read/write
64 * sharing, avoids the page cache, and synchronously waits for an
65 * ack from the OSD.
66 *
67 * - direct io takes the variant of the sync path that references
68 * user pages directly.
69 *
70 * fsync() flushes and waits on dirty pages, but just queues metadata
71 * for writeback: since the MDS can recover size and mtime there is no
72 * need to wait for MDS acknowledgement.
73 */
74
75 /*
76 * How many pages to get in one call to iov_iter_get_pages(). This
77 * determines the size of the on-stack array used as a buffer.
78 */
79 #define ITER_GET_BVECS_PAGES 64
80
81 static ssize_t __iter_get_bvecs(struct iov_iter *iter, size_t maxsize,
82 struct bio_vec *bvecs)
83 {
84 size_t size = 0;
85 int bvec_idx = 0;
86
87 if (maxsize > iov_iter_count(iter))
88 maxsize = iov_iter_count(iter);
89
90 while (size < maxsize) {
91 struct page *pages[ITER_GET_BVECS_PAGES];
92 ssize_t bytes;
93 size_t start;
94 int idx = 0;
95
96 bytes = iov_iter_get_pages(iter, pages, maxsize - size,
97 ITER_GET_BVECS_PAGES, &start);
98 if (bytes < 0)
99 return size ?: bytes;
100
101 iov_iter_advance(iter, bytes);
102 size += bytes;
103
104 for ( ; bytes; idx++, bvec_idx++) {
105 struct bio_vec bv = {
106 .bv_page = pages[idx],
107 .bv_len = min_t(int, bytes, PAGE_SIZE - start),
108 .bv_offset = start,
109 };
110
111 bvecs[bvec_idx] = bv;
112 bytes -= bv.bv_len;
113 start = 0;
114 }
115 }
116
117 return size;
118 }
119
120 /*
121 * iov_iter_get_pages() only considers one iov_iter segment, no matter
122 * what maxsize or maxpages are given. For ITER_BVEC that is a single
123 * page.
124 *
125 * Attempt to get up to @maxsize bytes worth of pages from @iter.
126 * Return the number of bytes in the created bio_vec array, or an error.
127 */
128 static ssize_t iter_get_bvecs_alloc(struct iov_iter *iter, size_t maxsize,
129 struct bio_vec **bvecs, int *num_bvecs)
130 {
131 struct bio_vec *bv;
132 size_t orig_count = iov_iter_count(iter);
133 ssize_t bytes;
134 int npages;
135
136 iov_iter_truncate(iter, maxsize);
137 npages = iov_iter_npages(iter, INT_MAX);
138 iov_iter_reexpand(iter, orig_count);
139
140 /*
141 * __iter_get_bvecs() may populate only part of the array -- zero it
142 * out.
143 */
144 bv = kvmalloc_array(npages, sizeof(*bv), GFP_KERNEL | __GFP_ZERO);
145 if (!bv)
146 return -ENOMEM;
147
148 bytes = __iter_get_bvecs(iter, maxsize, bv);
149 if (bytes < 0) {
150 /*
151 * No pages were pinned -- just free the array.
152 */
153 kvfree(bv);
154 return bytes;
155 }
156
157 *bvecs = bv;
158 *num_bvecs = npages;
159 return bytes;
160 }
161
162 static void put_bvecs(struct bio_vec *bvecs, int num_bvecs, bool should_dirty)
163 {
164 int i;
165
166 for (i = 0; i < num_bvecs; i++) {
167 if (bvecs[i].bv_page) {
168 if (should_dirty)
169 set_page_dirty_lock(bvecs[i].bv_page);
170 put_page(bvecs[i].bv_page);
171 }
172 }
173 kvfree(bvecs);
174 }
175
176 /*
177 * Prepare an open request. Preallocate ceph_cap to avoid an
178 * inopportune ENOMEM later.
179 */
180 static struct ceph_mds_request *
181 prepare_open_request(struct super_block *sb, int flags, int create_mode)
182 {
183 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
184 struct ceph_mds_client *mdsc = fsc->mdsc;
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_file_info *fi;
207
208 dout("%s %p %p 0%o (%s)\n", __func__, inode, file,
209 inode->i_mode, isdir ? "dir" : "regular");
210 BUG_ON(inode->i_fop->release != ceph_release);
211
212 if (isdir) {
213 struct ceph_dir_file_info *dfi =
214 kmem_cache_zalloc(ceph_dir_file_cachep, GFP_KERNEL);
215 if (!dfi)
216 return -ENOMEM;
217
218 file->private_data = dfi;
219 fi = &dfi->file_info;
220 dfi->next_offset = 2;
221 dfi->readdir_cache_idx = -1;
222 } else {
223 fi = kmem_cache_zalloc(ceph_file_cachep, GFP_KERNEL);
224 if (!fi)
225 return -ENOMEM;
226
227 file->private_data = fi;
228 }
229
230 ceph_get_fmode(ci, fmode, 1);
231 fi->fmode = fmode;
232
233 spin_lock_init(&fi->rw_contexts_lock);
234 INIT_LIST_HEAD(&fi->rw_contexts);
235 fi->meta_err = errseq_sample(&ci->i_meta_err);
236 fi->filp_gen = READ_ONCE(ceph_inode_to_client(inode)->filp_gen);
237
238 return 0;
239 }
240
241 /*
242 * initialize private struct file data.
243 * if we fail, clean up by dropping fmode reference on the ceph_inode
244 */
245 static int ceph_init_file(struct inode *inode, struct file *file, int fmode)
246 {
247 int ret = 0;
248
249 switch (inode->i_mode & S_IFMT) {
250 case S_IFREG:
251 ceph_fscache_register_inode_cookie(inode);
252 ceph_fscache_file_set_cookie(inode, file);
253 /* fall through */
254 case S_IFDIR:
255 ret = ceph_init_file_info(inode, file, fmode,
256 S_ISDIR(inode->i_mode));
257 if (ret)
258 return ret;
259 break;
260
261 case S_IFLNK:
262 dout("init_file %p %p 0%o (symlink)\n", inode, file,
263 inode->i_mode);
264 break;
265
266 default:
267 dout("init_file %p %p 0%o (special)\n", inode, file,
268 inode->i_mode);
269 /*
270 * we need to drop the open ref now, since we don't
271 * have .release set to ceph_release.
272 */
273 BUG_ON(inode->i_fop->release == ceph_release);
274
275 /* call the proper open fop */
276 ret = inode->i_fop->open(inode, file);
277 }
278 return ret;
279 }
280
281 /*
282 * try renew caps after session gets killed.
283 */
284 int ceph_renew_caps(struct inode *inode, int fmode)
285 {
286 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
287 struct ceph_inode_info *ci = ceph_inode(inode);
288 struct ceph_mds_request *req;
289 int err, flags, wanted;
290
291 spin_lock(&ci->i_ceph_lock);
292 __ceph_touch_fmode(ci, mdsc, fmode);
293 wanted = __ceph_caps_file_wanted(ci);
294 if (__ceph_is_any_real_caps(ci) &&
295 (!(wanted & CEPH_CAP_ANY_WR) || ci->i_auth_cap)) {
296 int issued = __ceph_caps_issued(ci, NULL);
297 spin_unlock(&ci->i_ceph_lock);
298 dout("renew caps %p want %s issued %s updating mds_wanted\n",
299 inode, ceph_cap_string(wanted), ceph_cap_string(issued));
300 ceph_check_caps(ci, 0, NULL);
301 return 0;
302 }
303 spin_unlock(&ci->i_ceph_lock);
304
305 flags = 0;
306 if ((wanted & CEPH_CAP_FILE_RD) && (wanted & CEPH_CAP_FILE_WR))
307 flags = O_RDWR;
308 else if (wanted & CEPH_CAP_FILE_RD)
309 flags = O_RDONLY;
310 else if (wanted & CEPH_CAP_FILE_WR)
311 flags = O_WRONLY;
312 #ifdef O_LAZY
313 if (wanted & CEPH_CAP_FILE_LAZYIO)
314 flags |= O_LAZY;
315 #endif
316
317 req = prepare_open_request(inode->i_sb, flags, 0);
318 if (IS_ERR(req)) {
319 err = PTR_ERR(req);
320 goto out;
321 }
322
323 req->r_inode = inode;
324 ihold(inode);
325 req->r_num_caps = 1;
326
327 err = ceph_mdsc_do_request(mdsc, NULL, req);
328 ceph_mdsc_put_request(req);
329 out:
330 dout("renew caps %p open result=%d\n", inode, err);
331 return err < 0 ? err : 0;
332 }
333
334 /*
335 * If we already have the requisite capabilities, we can satisfy
336 * the open request locally (no need to request new caps from the
337 * MDS). We do, however, need to inform the MDS (asynchronously)
338 * if our wanted caps set expands.
339 */
340 int ceph_open(struct inode *inode, struct file *file)
341 {
342 struct ceph_inode_info *ci = ceph_inode(inode);
343 struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
344 struct ceph_mds_client *mdsc = fsc->mdsc;
345 struct ceph_mds_request *req;
346 struct ceph_file_info *fi = file->private_data;
347 int err;
348 int flags, fmode, wanted;
349
350 if (fi) {
351 dout("open file %p is already opened\n", file);
352 return 0;
353 }
354
355 /* filter out O_CREAT|O_EXCL; vfs did that already. yuck. */
356 flags = file->f_flags & ~(O_CREAT|O_EXCL);
357 if (S_ISDIR(inode->i_mode))
358 flags = O_DIRECTORY; /* mds likes to know */
359
360 dout("open inode %p ino %llx.%llx file %p flags %d (%d)\n", inode,
361 ceph_vinop(inode), file, flags, file->f_flags);
362 fmode = ceph_flags_to_mode(flags);
363 wanted = ceph_caps_for_mode(fmode);
364
365 /* snapped files are read-only */
366 if (ceph_snap(inode) != CEPH_NOSNAP && (file->f_mode & FMODE_WRITE))
367 return -EROFS;
368
369 /* trivially open snapdir */
370 if (ceph_snap(inode) == CEPH_SNAPDIR) {
371 return ceph_init_file(inode, file, fmode);
372 }
373
374 /*
375 * No need to block if we have caps on the auth MDS (for
376 * write) or any MDS (for read). Update wanted set
377 * asynchronously.
378 */
379 spin_lock(&ci->i_ceph_lock);
380 if (__ceph_is_any_real_caps(ci) &&
381 (((fmode & CEPH_FILE_MODE_WR) == 0) || ci->i_auth_cap)) {
382 int mds_wanted = __ceph_caps_mds_wanted(ci, true);
383 int issued = __ceph_caps_issued(ci, NULL);
384
385 dout("open %p fmode %d want %s issued %s using existing\n",
386 inode, fmode, ceph_cap_string(wanted),
387 ceph_cap_string(issued));
388 __ceph_touch_fmode(ci, mdsc, fmode);
389 spin_unlock(&ci->i_ceph_lock);
390
391 /* adjust wanted? */
392 if ((issued & wanted) != wanted &&
393 (mds_wanted & wanted) != wanted &&
394 ceph_snap(inode) != CEPH_SNAPDIR)
395 ceph_check_caps(ci, 0, NULL);
396
397 return ceph_init_file(inode, file, fmode);
398 } else if (ceph_snap(inode) != CEPH_NOSNAP &&
399 (ci->i_snap_caps & wanted) == wanted) {
400 __ceph_touch_fmode(ci, mdsc, fmode);
401 spin_unlock(&ci->i_ceph_lock);
402 return ceph_init_file(inode, file, fmode);
403 }
404
405 spin_unlock(&ci->i_ceph_lock);
406
407 dout("open fmode %d wants %s\n", fmode, ceph_cap_string(wanted));
408 req = prepare_open_request(inode->i_sb, flags, 0);
409 if (IS_ERR(req)) {
410 err = PTR_ERR(req);
411 goto out;
412 }
413 req->r_inode = inode;
414 ihold(inode);
415
416 req->r_num_caps = 1;
417 err = ceph_mdsc_do_request(mdsc, NULL, req);
418 if (!err)
419 err = ceph_init_file(inode, file, req->r_fmode);
420 ceph_mdsc_put_request(req);
421 dout("open result=%d on %llx.%llx\n", err, ceph_vinop(inode));
422 out:
423 return err;
424 }
425
426 /* Clone the layout from a synchronous create, if the dir now has Dc caps */
427 static void
428 cache_file_layout(struct inode *dst, struct inode *src)
429 {
430 struct ceph_inode_info *cdst = ceph_inode(dst);
431 struct ceph_inode_info *csrc = ceph_inode(src);
432
433 spin_lock(&cdst->i_ceph_lock);
434 if ((__ceph_caps_issued(cdst, NULL) & CEPH_CAP_DIR_CREATE) &&
435 !ceph_file_layout_is_valid(&cdst->i_cached_layout)) {
436 memcpy(&cdst->i_cached_layout, &csrc->i_layout,
437 sizeof(cdst->i_cached_layout));
438 rcu_assign_pointer(cdst->i_cached_layout.pool_ns,
439 ceph_try_get_string(csrc->i_layout.pool_ns));
440 }
441 spin_unlock(&cdst->i_ceph_lock);
442 }
443
444 /*
445 * Try to set up an async create. We need caps, a file layout, and inode number,
446 * and either a lease on the dentry or complete dir info. If any of those
447 * criteria are not satisfied, then return false and the caller can go
448 * synchronous.
449 */
450 static int try_prep_async_create(struct inode *dir, struct dentry *dentry,
451 struct ceph_file_layout *lo, u64 *pino)
452 {
453 struct ceph_inode_info *ci = ceph_inode(dir);
454 struct ceph_dentry_info *di = ceph_dentry(dentry);
455 int got = 0, want = CEPH_CAP_FILE_EXCL | CEPH_CAP_DIR_CREATE;
456 u64 ino;
457
458 spin_lock(&ci->i_ceph_lock);
459 /* No auth cap means no chance for Dc caps */
460 if (!ci->i_auth_cap)
461 goto no_async;
462
463 /* Any delegated inos? */
464 if (xa_empty(&ci->i_auth_cap->session->s_delegated_inos))
465 goto no_async;
466
467 if (!ceph_file_layout_is_valid(&ci->i_cached_layout))
468 goto no_async;
469
470 if ((__ceph_caps_issued(ci, NULL) & want) != want)
471 goto no_async;
472
473 if (d_in_lookup(dentry)) {
474 if (!__ceph_dir_is_complete(ci))
475 goto no_async;
476 spin_lock(&dentry->d_lock);
477 di->lease_shared_gen = atomic_read(&ci->i_shared_gen);
478 spin_unlock(&dentry->d_lock);
479 } else if (atomic_read(&ci->i_shared_gen) !=
480 READ_ONCE(di->lease_shared_gen)) {
481 goto no_async;
482 }
483
484 ino = ceph_get_deleg_ino(ci->i_auth_cap->session);
485 if (!ino)
486 goto no_async;
487
488 *pino = ino;
489 ceph_take_cap_refs(ci, want, false);
490 memcpy(lo, &ci->i_cached_layout, sizeof(*lo));
491 rcu_assign_pointer(lo->pool_ns,
492 ceph_try_get_string(ci->i_cached_layout.pool_ns));
493 got = want;
494 no_async:
495 spin_unlock(&ci->i_ceph_lock);
496 return got;
497 }
498
499 static void restore_deleg_ino(struct inode *dir, u64 ino)
500 {
501 struct ceph_inode_info *ci = ceph_inode(dir);
502 struct ceph_mds_session *s = NULL;
503
504 spin_lock(&ci->i_ceph_lock);
505 if (ci->i_auth_cap)
506 s = ceph_get_mds_session(ci->i_auth_cap->session);
507 spin_unlock(&ci->i_ceph_lock);
508 if (s) {
509 int err = ceph_restore_deleg_ino(s, ino);
510 if (err)
511 pr_warn("ceph: unable to restore delegated ino 0x%llx to session: %d\n",
512 ino, err);
513 ceph_put_mds_session(s);
514 }
515 }
516
517 static void ceph_async_create_cb(struct ceph_mds_client *mdsc,
518 struct ceph_mds_request *req)
519 {
520 int result = req->r_err ? req->r_err :
521 le32_to_cpu(req->r_reply_info.head->result);
522
523 if (result == -EJUKEBOX)
524 goto out;
525
526 mapping_set_error(req->r_parent->i_mapping, result);
527
528 if (result) {
529 struct dentry *dentry = req->r_dentry;
530 int pathlen;
531 u64 base;
532 char *path = ceph_mdsc_build_path(req->r_dentry, &pathlen,
533 &base, 0);
534
535 ceph_dir_clear_complete(req->r_parent);
536 if (!d_unhashed(dentry))
537 d_drop(dentry);
538
539 /* FIXME: start returning I/O errors on all accesses? */
540 pr_warn("ceph: async create failure path=(%llx)%s result=%d!\n",
541 base, IS_ERR(path) ? "<<bad>>" : path, result);
542 ceph_mdsc_free_path(path, pathlen);
543 }
544
545 if (req->r_target_inode) {
546 struct ceph_inode_info *ci = ceph_inode(req->r_target_inode);
547 u64 ino = ceph_vino(req->r_target_inode).ino;
548
549 if (req->r_deleg_ino != ino)
550 pr_warn("%s: inode number mismatch! err=%d deleg_ino=0x%llx target=0x%llx\n",
551 __func__, req->r_err, req->r_deleg_ino, ino);
552 mapping_set_error(req->r_target_inode->i_mapping, result);
553
554 spin_lock(&ci->i_ceph_lock);
555 if (ci->i_ceph_flags & CEPH_I_ASYNC_CREATE) {
556 ci->i_ceph_flags &= ~CEPH_I_ASYNC_CREATE;
557 wake_up_bit(&ci->i_ceph_flags, CEPH_ASYNC_CREATE_BIT);
558 }
559 ceph_kick_flushing_inode_caps(req->r_session, ci);
560 spin_unlock(&ci->i_ceph_lock);
561 } else {
562 pr_warn("%s: no req->r_target_inode for 0x%llx\n", __func__,
563 req->r_deleg_ino);
564 }
565 out:
566 ceph_mdsc_release_dir_caps(req);
567 }
568
569 static int ceph_finish_async_create(struct inode *dir, struct dentry *dentry,
570 struct file *file, umode_t mode,
571 struct ceph_mds_request *req,
572 struct ceph_acl_sec_ctx *as_ctx,
573 struct ceph_file_layout *lo)
574 {
575 int ret;
576 char xattr_buf[4];
577 struct ceph_mds_reply_inode in = { };
578 struct ceph_mds_reply_info_in iinfo = { .in = &in };
579 struct ceph_inode_info *ci = ceph_inode(dir);
580 struct inode *inode;
581 struct timespec64 now;
582 struct ceph_vino vino = { .ino = req->r_deleg_ino,
583 .snap = CEPH_NOSNAP };
584
585 ktime_get_real_ts64(&now);
586
587 inode = ceph_get_inode(dentry->d_sb, vino);
588 if (IS_ERR(inode))
589 return PTR_ERR(inode);
590
591 iinfo.inline_version = CEPH_INLINE_NONE;
592 iinfo.change_attr = 1;
593 ceph_encode_timespec64(&iinfo.btime, &now);
594
595 iinfo.xattr_len = ARRAY_SIZE(xattr_buf);
596 iinfo.xattr_data = xattr_buf;
597 memset(iinfo.xattr_data, 0, iinfo.xattr_len);
598
599 in.ino = cpu_to_le64(vino.ino);
600 in.snapid = cpu_to_le64(CEPH_NOSNAP);
601 in.version = cpu_to_le64(1); // ???
602 in.cap.caps = in.cap.wanted = cpu_to_le32(CEPH_CAP_ALL_FILE);
603 in.cap.cap_id = cpu_to_le64(1);
604 in.cap.realm = cpu_to_le64(ci->i_snap_realm->ino);
605 in.cap.flags = CEPH_CAP_FLAG_AUTH;
606 in.ctime = in.mtime = in.atime = iinfo.btime;
607 in.mode = cpu_to_le32((u32)mode);
608 in.truncate_seq = cpu_to_le32(1);
609 in.truncate_size = cpu_to_le64(-1ULL);
610 in.xattr_version = cpu_to_le64(1);
611 in.uid = cpu_to_le32(from_kuid(&init_user_ns, current_fsuid()));
612 in.gid = cpu_to_le32(from_kgid(&init_user_ns, dir->i_mode & S_ISGID ?
613 dir->i_gid : current_fsgid()));
614 in.nlink = cpu_to_le32(1);
615 in.max_size = cpu_to_le64(lo->stripe_unit);
616
617 ceph_file_layout_to_legacy(lo, &in.layout);
618
619 ret = ceph_fill_inode(inode, NULL, &iinfo, NULL, req->r_session,
620 req->r_fmode, NULL);
621 if (ret) {
622 dout("%s failed to fill inode: %d\n", __func__, ret);
623 ceph_dir_clear_complete(dir);
624 if (!d_unhashed(dentry))
625 d_drop(dentry);
626 if (inode->i_state & I_NEW)
627 discard_new_inode(inode);
628 } else {
629 struct dentry *dn;
630
631 dout("%s d_adding new inode 0x%llx to 0x%lx/%s\n", __func__,
632 vino.ino, dir->i_ino, dentry->d_name.name);
633 ceph_dir_clear_ordered(dir);
634 ceph_init_inode_acls(inode, as_ctx);
635 if (inode->i_state & I_NEW) {
636 /*
637 * If it's not I_NEW, then someone created this before
638 * we got here. Assume the server is aware of it at
639 * that point and don't worry about setting
640 * CEPH_I_ASYNC_CREATE.
641 */
642 ceph_inode(inode)->i_ceph_flags = CEPH_I_ASYNC_CREATE;
643 unlock_new_inode(inode);
644 }
645 if (d_in_lookup(dentry) || d_really_is_negative(dentry)) {
646 if (!d_unhashed(dentry))
647 d_drop(dentry);
648 dn = d_splice_alias(inode, dentry);
649 WARN_ON_ONCE(dn && dn != dentry);
650 }
651 file->f_mode |= FMODE_CREATED;
652 ret = finish_open(file, dentry, ceph_open);
653 }
654 return ret;
655 }
656
657 /*
658 * Do a lookup + open with a single request. If we get a non-existent
659 * file or symlink, return 1 so the VFS can retry.
660 */
661 int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
662 struct file *file, unsigned flags, umode_t mode)
663 {
664 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
665 struct ceph_mds_client *mdsc = fsc->mdsc;
666 struct ceph_mds_request *req;
667 struct dentry *dn;
668 struct ceph_acl_sec_ctx as_ctx = {};
669 bool try_async = ceph_test_mount_opt(fsc, ASYNC_DIROPS);
670 int mask;
671 int err;
672
673 dout("atomic_open %p dentry %p '%pd' %s flags %d mode 0%o\n",
674 dir, dentry, dentry,
675 d_unhashed(dentry) ? "unhashed" : "hashed", flags, mode);
676
677 if (dentry->d_name.len > NAME_MAX)
678 return -ENAMETOOLONG;
679
680 if (flags & O_CREAT) {
681 if (ceph_quota_is_max_files_exceeded(dir))
682 return -EDQUOT;
683 err = ceph_pre_init_acls(dir, &mode, &as_ctx);
684 if (err < 0)
685 return err;
686 err = ceph_security_init_secctx(dentry, mode, &as_ctx);
687 if (err < 0)
688 goto out_ctx;
689 } else if (!d_in_lookup(dentry)) {
690 /* If it's not being looked up, it's negative */
691 return -ENOENT;
692 }
693 retry:
694 /* do the open */
695 req = prepare_open_request(dir->i_sb, flags, mode);
696 if (IS_ERR(req)) {
697 err = PTR_ERR(req);
698 goto out_ctx;
699 }
700 req->r_dentry = dget(dentry);
701 req->r_num_caps = 2;
702 mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED;
703 if (ceph_security_xattr_wanted(dir))
704 mask |= CEPH_CAP_XATTR_SHARED;
705 req->r_args.open.mask = cpu_to_le32(mask);
706 req->r_parent = dir;
707
708 if (flags & O_CREAT) {
709 struct ceph_file_layout lo;
710
711 req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL;
712 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
713 if (as_ctx.pagelist) {
714 req->r_pagelist = as_ctx.pagelist;
715 as_ctx.pagelist = NULL;
716 }
717 if (try_async &&
718 (req->r_dir_caps =
719 try_prep_async_create(dir, dentry, &lo,
720 &req->r_deleg_ino))) {
721 set_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags);
722 req->r_args.open.flags |= cpu_to_le32(CEPH_O_EXCL);
723 req->r_callback = ceph_async_create_cb;
724 err = ceph_mdsc_submit_request(mdsc, dir, req);
725 if (!err) {
726 err = ceph_finish_async_create(dir, dentry,
727 file, mode, req,
728 &as_ctx, &lo);
729 } else if (err == -EJUKEBOX) {
730 restore_deleg_ino(dir, req->r_deleg_ino);
731 ceph_mdsc_put_request(req);
732 try_async = false;
733 goto retry;
734 }
735 goto out_req;
736 }
737 }
738
739 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
740 err = ceph_mdsc_do_request(mdsc,
741 (flags & (O_CREAT|O_TRUNC)) ? dir : NULL,
742 req);
743 err = ceph_handle_snapdir(req, dentry, err);
744 if (err)
745 goto out_req;
746
747 if ((flags & O_CREAT) && !req->r_reply_info.head->is_dentry)
748 err = ceph_handle_notrace_create(dir, dentry);
749
750 if (d_in_lookup(dentry)) {
751 dn = ceph_finish_lookup(req, dentry, err);
752 if (IS_ERR(dn))
753 err = PTR_ERR(dn);
754 } else {
755 /* we were given a hashed negative dentry */
756 dn = NULL;
757 }
758 if (err)
759 goto out_req;
760 if (dn || d_really_is_negative(dentry) || d_is_symlink(dentry)) {
761 /* make vfs retry on splice, ENOENT, or symlink */
762 dout("atomic_open finish_no_open on dn %p\n", dn);
763 err = finish_no_open(file, dn);
764 } else {
765 dout("atomic_open finish_open on dn %p\n", dn);
766 if (req->r_op == CEPH_MDS_OP_CREATE && req->r_reply_info.has_create_ino) {
767 struct inode *newino = d_inode(dentry);
768
769 cache_file_layout(dir, newino);
770 ceph_init_inode_acls(newino, &as_ctx);
771 file->f_mode |= FMODE_CREATED;
772 }
773 err = finish_open(file, dentry, ceph_open);
774 }
775 out_req:
776 ceph_mdsc_put_request(req);
777 out_ctx:
778 ceph_release_acl_sec_ctx(&as_ctx);
779 dout("atomic_open result=%d\n", err);
780 return err;
781 }
782
783 int ceph_release(struct inode *inode, struct file *file)
784 {
785 struct ceph_inode_info *ci = ceph_inode(inode);
786
787 if (S_ISDIR(inode->i_mode)) {
788 struct ceph_dir_file_info *dfi = file->private_data;
789 dout("release inode %p dir file %p\n", inode, file);
790 WARN_ON(!list_empty(&dfi->file_info.rw_contexts));
791
792 ceph_put_fmode(ci, dfi->file_info.fmode, 1);
793
794 if (dfi->last_readdir)
795 ceph_mdsc_put_request(dfi->last_readdir);
796 kfree(dfi->last_name);
797 kfree(dfi->dir_info);
798 kmem_cache_free(ceph_dir_file_cachep, dfi);
799 } else {
800 struct ceph_file_info *fi = file->private_data;
801 dout("release inode %p regular file %p\n", inode, file);
802 WARN_ON(!list_empty(&fi->rw_contexts));
803
804 ceph_put_fmode(ci, fi->fmode, 1);
805
806 kmem_cache_free(ceph_file_cachep, fi);
807 }
808
809 /* wake up anyone waiting for caps on this inode */
810 wake_up_all(&ci->i_cap_wq);
811 return 0;
812 }
813
814 enum {
815 HAVE_RETRIED = 1,
816 CHECK_EOF = 2,
817 READ_INLINE = 3,
818 };
819
820 /*
821 * Completely synchronous read and write methods. Direct from __user
822 * buffer to osd, or directly to user pages (if O_DIRECT).
823 *
824 * If the read spans object boundary, just do multiple reads. (That's not
825 * atomic, but good enough for now.)
826 *
827 * If we get a short result from the OSD, check against i_size; we need to
828 * only return a short read to the caller if we hit EOF.
829 */
830 static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *to,
831 int *retry_op)
832 {
833 struct file *file = iocb->ki_filp;
834 struct inode *inode = file_inode(file);
835 struct ceph_inode_info *ci = ceph_inode(inode);
836 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
837 struct ceph_osd_client *osdc = &fsc->client->osdc;
838 ssize_t ret;
839 u64 off = iocb->ki_pos;
840 u64 len = iov_iter_count(to);
841
842 dout("sync_read on file %p %llu~%u %s\n", file, off, (unsigned)len,
843 (file->f_flags & O_DIRECT) ? "O_DIRECT" : "");
844
845 if (!len)
846 return 0;
847 /*
848 * flush any page cache pages in this range. this
849 * will make concurrent normal and sync io slow,
850 * but it will at least behave sensibly when they are
851 * in sequence.
852 */
853 ret = filemap_write_and_wait_range(inode->i_mapping,
854 off, off + len - 1);
855 if (ret < 0)
856 return ret;
857
858 ret = 0;
859 while ((len = iov_iter_count(to)) > 0) {
860 struct ceph_osd_request *req;
861 struct page **pages;
862 int num_pages;
863 size_t page_off;
864 u64 i_size;
865 bool more;
866
867 req = ceph_osdc_new_request(osdc, &ci->i_layout,
868 ci->i_vino, off, &len, 0, 1,
869 CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ,
870 NULL, ci->i_truncate_seq,
871 ci->i_truncate_size, false);
872 if (IS_ERR(req)) {
873 ret = PTR_ERR(req);
874 break;
875 }
876
877 more = len < iov_iter_count(to);
878
879 if (unlikely(iov_iter_is_pipe(to))) {
880 ret = iov_iter_get_pages_alloc(to, &pages, len,
881 &page_off);
882 if (ret <= 0) {
883 ceph_osdc_put_request(req);
884 ret = -ENOMEM;
885 break;
886 }
887 num_pages = DIV_ROUND_UP(ret + page_off, PAGE_SIZE);
888 if (ret < len) {
889 len = ret;
890 osd_req_op_extent_update(req, 0, len);
891 more = false;
892 }
893 } else {
894 num_pages = calc_pages_for(off, len);
895 page_off = off & ~PAGE_MASK;
896 pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL);
897 if (IS_ERR(pages)) {
898 ceph_osdc_put_request(req);
899 ret = PTR_ERR(pages);
900 break;
901 }
902 }
903
904 osd_req_op_extent_osd_data_pages(req, 0, pages, len, page_off,
905 false, false);
906 ret = ceph_osdc_start_request(osdc, req, false);
907 if (!ret)
908 ret = ceph_osdc_wait_request(osdc, req);
909 ceph_osdc_put_request(req);
910
911 i_size = i_size_read(inode);
912 dout("sync_read %llu~%llu got %zd i_size %llu%s\n",
913 off, len, ret, i_size, (more ? " MORE" : ""));
914
915 if (ret == -ENOENT)
916 ret = 0;
917 if (ret >= 0 && ret < len && (off + ret < i_size)) {
918 int zlen = min(len - ret, i_size - off - ret);
919 int zoff = page_off + ret;
920 dout("sync_read zero gap %llu~%llu\n",
921 off + ret, off + ret + zlen);
922 ceph_zero_page_vector_range(zoff, zlen, pages);
923 ret += zlen;
924 }
925
926 if (unlikely(iov_iter_is_pipe(to))) {
927 if (ret > 0) {
928 iov_iter_advance(to, ret);
929 off += ret;
930 } else {
931 iov_iter_advance(to, 0);
932 }
933 ceph_put_page_vector(pages, num_pages, false);
934 } else {
935 int idx = 0;
936 size_t left = ret > 0 ? ret : 0;
937 while (left > 0) {
938 size_t len, copied;
939 page_off = off & ~PAGE_MASK;
940 len = min_t(size_t, left, PAGE_SIZE - page_off);
941 copied = copy_page_to_iter(pages[idx++],
942 page_off, len, to);
943 off += copied;
944 left -= copied;
945 if (copied < len) {
946 ret = -EFAULT;
947 break;
948 }
949 }
950 ceph_release_page_vector(pages, num_pages);
951 }
952
953 if (ret < 0) {
954 if (ret == -EBLACKLISTED)
955 fsc->blacklisted = true;
956 break;
957 }
958
959 if (off >= i_size || !more)
960 break;
961 }
962
963 if (off > iocb->ki_pos) {
964 if (ret >= 0 &&
965 iov_iter_count(to) > 0 && off >= i_size_read(inode))
966 *retry_op = CHECK_EOF;
967 ret = off - iocb->ki_pos;
968 iocb->ki_pos = off;
969 }
970
971 dout("sync_read result %zd retry_op %d\n", ret, *retry_op);
972 return ret;
973 }
974
975 struct ceph_aio_request {
976 struct kiocb *iocb;
977 size_t total_len;
978 bool write;
979 bool should_dirty;
980 int error;
981 struct list_head osd_reqs;
982 unsigned num_reqs;
983 atomic_t pending_reqs;
984 struct timespec64 mtime;
985 struct ceph_cap_flush *prealloc_cf;
986 };
987
988 struct ceph_aio_work {
989 struct work_struct work;
990 struct ceph_osd_request *req;
991 };
992
993 static void ceph_aio_retry_work(struct work_struct *work);
994
995 static void ceph_aio_complete(struct inode *inode,
996 struct ceph_aio_request *aio_req)
997 {
998 struct ceph_inode_info *ci = ceph_inode(inode);
999 int ret;
1000
1001 if (!atomic_dec_and_test(&aio_req->pending_reqs))
1002 return;
1003
1004 if (aio_req->iocb->ki_flags & IOCB_DIRECT)
1005 inode_dio_end(inode);
1006
1007 ret = aio_req->error;
1008 if (!ret)
1009 ret = aio_req->total_len;
1010
1011 dout("ceph_aio_complete %p rc %d\n", inode, ret);
1012
1013 if (ret >= 0 && aio_req->write) {
1014 int dirty;
1015
1016 loff_t endoff = aio_req->iocb->ki_pos + aio_req->total_len;
1017 if (endoff > i_size_read(inode)) {
1018 if (ceph_inode_set_size(inode, endoff))
1019 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
1020 }
1021
1022 spin_lock(&ci->i_ceph_lock);
1023 ci->i_inline_version = CEPH_INLINE_NONE;
1024 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
1025 &aio_req->prealloc_cf);
1026 spin_unlock(&ci->i_ceph_lock);
1027 if (dirty)
1028 __mark_inode_dirty(inode, dirty);
1029
1030 }
1031
1032 ceph_put_cap_refs(ci, (aio_req->write ? CEPH_CAP_FILE_WR :
1033 CEPH_CAP_FILE_RD));
1034
1035 aio_req->iocb->ki_complete(aio_req->iocb, ret, 0);
1036
1037 ceph_free_cap_flush(aio_req->prealloc_cf);
1038 kfree(aio_req);
1039 }
1040
1041 static void ceph_aio_complete_req(struct ceph_osd_request *req)
1042 {
1043 int rc = req->r_result;
1044 struct inode *inode = req->r_inode;
1045 struct ceph_aio_request *aio_req = req->r_priv;
1046 struct ceph_osd_data *osd_data = osd_req_op_extent_osd_data(req, 0);
1047
1048 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_BVECS);
1049 BUG_ON(!osd_data->num_bvecs);
1050
1051 dout("ceph_aio_complete_req %p rc %d bytes %u\n",
1052 inode, rc, osd_data->bvec_pos.iter.bi_size);
1053
1054 if (rc == -EOLDSNAPC) {
1055 struct ceph_aio_work *aio_work;
1056 BUG_ON(!aio_req->write);
1057
1058 aio_work = kmalloc(sizeof(*aio_work), GFP_NOFS);
1059 if (aio_work) {
1060 INIT_WORK(&aio_work->work, ceph_aio_retry_work);
1061 aio_work->req = req;
1062 queue_work(ceph_inode_to_client(inode)->inode_wq,
1063 &aio_work->work);
1064 return;
1065 }
1066 rc = -ENOMEM;
1067 } else if (!aio_req->write) {
1068 if (rc == -ENOENT)
1069 rc = 0;
1070 if (rc >= 0 && osd_data->bvec_pos.iter.bi_size > rc) {
1071 struct iov_iter i;
1072 int zlen = osd_data->bvec_pos.iter.bi_size - rc;
1073
1074 /*
1075 * If read is satisfied by single OSD request,
1076 * it can pass EOF. Otherwise read is within
1077 * i_size.
1078 */
1079 if (aio_req->num_reqs == 1) {
1080 loff_t i_size = i_size_read(inode);
1081 loff_t endoff = aio_req->iocb->ki_pos + rc;
1082 if (endoff < i_size)
1083 zlen = min_t(size_t, zlen,
1084 i_size - endoff);
1085 aio_req->total_len = rc + zlen;
1086 }
1087
1088 iov_iter_bvec(&i, READ, osd_data->bvec_pos.bvecs,
1089 osd_data->num_bvecs,
1090 osd_data->bvec_pos.iter.bi_size);
1091 iov_iter_advance(&i, rc);
1092 iov_iter_zero(zlen, &i);
1093 }
1094 }
1095
1096 put_bvecs(osd_data->bvec_pos.bvecs, osd_data->num_bvecs,
1097 aio_req->should_dirty);
1098 ceph_osdc_put_request(req);
1099
1100 if (rc < 0)
1101 cmpxchg(&aio_req->error, 0, rc);
1102
1103 ceph_aio_complete(inode, aio_req);
1104 return;
1105 }
1106
1107 static void ceph_aio_retry_work(struct work_struct *work)
1108 {
1109 struct ceph_aio_work *aio_work =
1110 container_of(work, struct ceph_aio_work, work);
1111 struct ceph_osd_request *orig_req = aio_work->req;
1112 struct ceph_aio_request *aio_req = orig_req->r_priv;
1113 struct inode *inode = orig_req->r_inode;
1114 struct ceph_inode_info *ci = ceph_inode(inode);
1115 struct ceph_snap_context *snapc;
1116 struct ceph_osd_request *req;
1117 int ret;
1118
1119 spin_lock(&ci->i_ceph_lock);
1120 if (__ceph_have_pending_cap_snap(ci)) {
1121 struct ceph_cap_snap *capsnap =
1122 list_last_entry(&ci->i_cap_snaps,
1123 struct ceph_cap_snap,
1124 ci_item);
1125 snapc = ceph_get_snap_context(capsnap->context);
1126 } else {
1127 BUG_ON(!ci->i_head_snapc);
1128 snapc = ceph_get_snap_context(ci->i_head_snapc);
1129 }
1130 spin_unlock(&ci->i_ceph_lock);
1131
1132 req = ceph_osdc_alloc_request(orig_req->r_osdc, snapc, 1,
1133 false, GFP_NOFS);
1134 if (!req) {
1135 ret = -ENOMEM;
1136 req = orig_req;
1137 goto out;
1138 }
1139
1140 req->r_flags = /* CEPH_OSD_FLAG_ORDERSNAP | */ CEPH_OSD_FLAG_WRITE;
1141 ceph_oloc_copy(&req->r_base_oloc, &orig_req->r_base_oloc);
1142 ceph_oid_copy(&req->r_base_oid, &orig_req->r_base_oid);
1143
1144 req->r_ops[0] = orig_req->r_ops[0];
1145
1146 req->r_mtime = aio_req->mtime;
1147 req->r_data_offset = req->r_ops[0].extent.offset;
1148
1149 ret = ceph_osdc_alloc_messages(req, GFP_NOFS);
1150 if (ret) {
1151 ceph_osdc_put_request(req);
1152 req = orig_req;
1153 goto out;
1154 }
1155
1156 ceph_osdc_put_request(orig_req);
1157
1158 req->r_callback = ceph_aio_complete_req;
1159 req->r_inode = inode;
1160 req->r_priv = aio_req;
1161
1162 ret = ceph_osdc_start_request(req->r_osdc, req, false);
1163 out:
1164 if (ret < 0) {
1165 req->r_result = ret;
1166 ceph_aio_complete_req(req);
1167 }
1168
1169 ceph_put_snap_context(snapc);
1170 kfree(aio_work);
1171 }
1172
1173 static ssize_t
1174 ceph_direct_read_write(struct kiocb *iocb, struct iov_iter *iter,
1175 struct ceph_snap_context *snapc,
1176 struct ceph_cap_flush **pcf)
1177 {
1178 struct file *file = iocb->ki_filp;
1179 struct inode *inode = file_inode(file);
1180 struct ceph_inode_info *ci = ceph_inode(inode);
1181 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1182 struct ceph_vino vino;
1183 struct ceph_osd_request *req;
1184 struct bio_vec *bvecs;
1185 struct ceph_aio_request *aio_req = NULL;
1186 int num_pages = 0;
1187 int flags;
1188 int ret = 0;
1189 struct timespec64 mtime = current_time(inode);
1190 size_t count = iov_iter_count(iter);
1191 loff_t pos = iocb->ki_pos;
1192 bool write = iov_iter_rw(iter) == WRITE;
1193 bool should_dirty = !write && iter_is_iovec(iter);
1194
1195 if (write && ceph_snap(file_inode(file)) != CEPH_NOSNAP)
1196 return -EROFS;
1197
1198 dout("sync_direct_%s on file %p %lld~%u snapc %p seq %lld\n",
1199 (write ? "write" : "read"), file, pos, (unsigned)count,
1200 snapc, snapc ? snapc->seq : 0);
1201
1202 if (write) {
1203 int ret2 = invalidate_inode_pages2_range(inode->i_mapping,
1204 pos >> PAGE_SHIFT,
1205 (pos + count - 1) >> PAGE_SHIFT);
1206 if (ret2 < 0)
1207 dout("invalidate_inode_pages2_range returned %d\n", ret2);
1208
1209 flags = /* CEPH_OSD_FLAG_ORDERSNAP | */ CEPH_OSD_FLAG_WRITE;
1210 } else {
1211 flags = CEPH_OSD_FLAG_READ;
1212 }
1213
1214 while (iov_iter_count(iter) > 0) {
1215 u64 size = iov_iter_count(iter);
1216 ssize_t len;
1217
1218 if (write)
1219 size = min_t(u64, size, fsc->mount_options->wsize);
1220 else
1221 size = min_t(u64, size, fsc->mount_options->rsize);
1222
1223 vino = ceph_vino(inode);
1224 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1225 vino, pos, &size, 0,
1226 1,
1227 write ? CEPH_OSD_OP_WRITE :
1228 CEPH_OSD_OP_READ,
1229 flags, snapc,
1230 ci->i_truncate_seq,
1231 ci->i_truncate_size,
1232 false);
1233 if (IS_ERR(req)) {
1234 ret = PTR_ERR(req);
1235 break;
1236 }
1237
1238 len = iter_get_bvecs_alloc(iter, size, &bvecs, &num_pages);
1239 if (len < 0) {
1240 ceph_osdc_put_request(req);
1241 ret = len;
1242 break;
1243 }
1244 if (len != size)
1245 osd_req_op_extent_update(req, 0, len);
1246
1247 /*
1248 * To simplify error handling, allow AIO when IO within i_size
1249 * or IO can be satisfied by single OSD request.
1250 */
1251 if (pos == iocb->ki_pos && !is_sync_kiocb(iocb) &&
1252 (len == count || pos + count <= i_size_read(inode))) {
1253 aio_req = kzalloc(sizeof(*aio_req), GFP_KERNEL);
1254 if (aio_req) {
1255 aio_req->iocb = iocb;
1256 aio_req->write = write;
1257 aio_req->should_dirty = should_dirty;
1258 INIT_LIST_HEAD(&aio_req->osd_reqs);
1259 if (write) {
1260 aio_req->mtime = mtime;
1261 swap(aio_req->prealloc_cf, *pcf);
1262 }
1263 }
1264 /* ignore error */
1265 }
1266
1267 if (write) {
1268 /*
1269 * throw out any page cache pages in this range. this
1270 * may block.
1271 */
1272 truncate_inode_pages_range(inode->i_mapping, pos,
1273 PAGE_ALIGN(pos + len) - 1);
1274
1275 req->r_mtime = mtime;
1276 }
1277
1278 osd_req_op_extent_osd_data_bvecs(req, 0, bvecs, num_pages, len);
1279
1280 if (aio_req) {
1281 aio_req->total_len += len;
1282 aio_req->num_reqs++;
1283 atomic_inc(&aio_req->pending_reqs);
1284
1285 req->r_callback = ceph_aio_complete_req;
1286 req->r_inode = inode;
1287 req->r_priv = aio_req;
1288 list_add_tail(&req->r_private_item, &aio_req->osd_reqs);
1289
1290 pos += len;
1291 continue;
1292 }
1293
1294 ret = ceph_osdc_start_request(req->r_osdc, req, false);
1295 if (!ret)
1296 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
1297
1298 size = i_size_read(inode);
1299 if (!write) {
1300 if (ret == -ENOENT)
1301 ret = 0;
1302 if (ret >= 0 && ret < len && pos + ret < size) {
1303 struct iov_iter i;
1304 int zlen = min_t(size_t, len - ret,
1305 size - pos - ret);
1306
1307 iov_iter_bvec(&i, READ, bvecs, num_pages, len);
1308 iov_iter_advance(&i, ret);
1309 iov_iter_zero(zlen, &i);
1310 ret += zlen;
1311 }
1312 if (ret >= 0)
1313 len = ret;
1314 }
1315
1316 put_bvecs(bvecs, num_pages, should_dirty);
1317 ceph_osdc_put_request(req);
1318 if (ret < 0)
1319 break;
1320
1321 pos += len;
1322 if (!write && pos >= size)
1323 break;
1324
1325 if (write && pos > size) {
1326 if (ceph_inode_set_size(inode, pos))
1327 ceph_check_caps(ceph_inode(inode),
1328 CHECK_CAPS_AUTHONLY,
1329 NULL);
1330 }
1331 }
1332
1333 if (aio_req) {
1334 LIST_HEAD(osd_reqs);
1335
1336 if (aio_req->num_reqs == 0) {
1337 kfree(aio_req);
1338 return ret;
1339 }
1340
1341 ceph_get_cap_refs(ci, write ? CEPH_CAP_FILE_WR :
1342 CEPH_CAP_FILE_RD);
1343
1344 list_splice(&aio_req->osd_reqs, &osd_reqs);
1345 inode_dio_begin(inode);
1346 while (!list_empty(&osd_reqs)) {
1347 req = list_first_entry(&osd_reqs,
1348 struct ceph_osd_request,
1349 r_private_item);
1350 list_del_init(&req->r_private_item);
1351 if (ret >= 0)
1352 ret = ceph_osdc_start_request(req->r_osdc,
1353 req, false);
1354 if (ret < 0) {
1355 req->r_result = ret;
1356 ceph_aio_complete_req(req);
1357 }
1358 }
1359 return -EIOCBQUEUED;
1360 }
1361
1362 if (ret != -EOLDSNAPC && pos > iocb->ki_pos) {
1363 ret = pos - iocb->ki_pos;
1364 iocb->ki_pos = pos;
1365 }
1366 return ret;
1367 }
1368
1369 /*
1370 * Synchronous write, straight from __user pointer or user pages.
1371 *
1372 * If write spans object boundary, just do multiple writes. (For a
1373 * correct atomic write, we should e.g. take write locks on all
1374 * objects, rollback on failure, etc.)
1375 */
1376 static ssize_t
1377 ceph_sync_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos,
1378 struct ceph_snap_context *snapc)
1379 {
1380 struct file *file = iocb->ki_filp;
1381 struct inode *inode = file_inode(file);
1382 struct ceph_inode_info *ci = ceph_inode(inode);
1383 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1384 struct ceph_vino vino;
1385 struct ceph_osd_request *req;
1386 struct page **pages;
1387 u64 len;
1388 int num_pages;
1389 int written = 0;
1390 int flags;
1391 int ret;
1392 bool check_caps = false;
1393 struct timespec64 mtime = current_time(inode);
1394 size_t count = iov_iter_count(from);
1395
1396 if (ceph_snap(file_inode(file)) != CEPH_NOSNAP)
1397 return -EROFS;
1398
1399 dout("sync_write on file %p %lld~%u snapc %p seq %lld\n",
1400 file, pos, (unsigned)count, snapc, snapc->seq);
1401
1402 ret = filemap_write_and_wait_range(inode->i_mapping,
1403 pos, pos + count - 1);
1404 if (ret < 0)
1405 return ret;
1406
1407 ret = invalidate_inode_pages2_range(inode->i_mapping,
1408 pos >> PAGE_SHIFT,
1409 (pos + count - 1) >> PAGE_SHIFT);
1410 if (ret < 0)
1411 dout("invalidate_inode_pages2_range returned %d\n", ret);
1412
1413 flags = /* CEPH_OSD_FLAG_ORDERSNAP | */ CEPH_OSD_FLAG_WRITE;
1414
1415 while ((len = iov_iter_count(from)) > 0) {
1416 size_t left;
1417 int n;
1418
1419 vino = ceph_vino(inode);
1420 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1421 vino, pos, &len, 0, 1,
1422 CEPH_OSD_OP_WRITE, flags, snapc,
1423 ci->i_truncate_seq,
1424 ci->i_truncate_size,
1425 false);
1426 if (IS_ERR(req)) {
1427 ret = PTR_ERR(req);
1428 break;
1429 }
1430
1431 /*
1432 * write from beginning of first page,
1433 * regardless of io alignment
1434 */
1435 num_pages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
1436
1437 pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL);
1438 if (IS_ERR(pages)) {
1439 ret = PTR_ERR(pages);
1440 goto out;
1441 }
1442
1443 left = len;
1444 for (n = 0; n < num_pages; n++) {
1445 size_t plen = min_t(size_t, left, PAGE_SIZE);
1446 ret = copy_page_from_iter(pages[n], 0, plen, from);
1447 if (ret != plen) {
1448 ret = -EFAULT;
1449 break;
1450 }
1451 left -= ret;
1452 }
1453
1454 if (ret < 0) {
1455 ceph_release_page_vector(pages, num_pages);
1456 goto out;
1457 }
1458
1459 req->r_inode = inode;
1460
1461 osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0,
1462 false, true);
1463
1464 req->r_mtime = mtime;
1465 ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
1466 if (!ret)
1467 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
1468
1469 out:
1470 ceph_osdc_put_request(req);
1471 if (ret != 0) {
1472 ceph_set_error_write(ci);
1473 break;
1474 }
1475
1476 ceph_clear_error_write(ci);
1477 pos += len;
1478 written += len;
1479 if (pos > i_size_read(inode)) {
1480 check_caps = ceph_inode_set_size(inode, pos);
1481 if (check_caps)
1482 ceph_check_caps(ceph_inode(inode),
1483 CHECK_CAPS_AUTHONLY,
1484 NULL);
1485 }
1486
1487 }
1488
1489 if (ret != -EOLDSNAPC && written > 0) {
1490 ret = written;
1491 iocb->ki_pos = pos;
1492 }
1493 return ret;
1494 }
1495
1496 /*
1497 * Wrap generic_file_aio_read with checks for cap bits on the inode.
1498 * Atomically grab references, so that those bits are not released
1499 * back to the MDS mid-read.
1500 *
1501 * Hmm, the sync read case isn't actually async... should it be?
1502 */
1503 static ssize_t ceph_read_iter(struct kiocb *iocb, struct iov_iter *to)
1504 {
1505 struct file *filp = iocb->ki_filp;
1506 struct ceph_file_info *fi = filp->private_data;
1507 size_t len = iov_iter_count(to);
1508 struct inode *inode = file_inode(filp);
1509 struct ceph_inode_info *ci = ceph_inode(inode);
1510 struct page *pinned_page = NULL;
1511 ssize_t ret;
1512 int want, got = 0;
1513 int retry_op = 0, read = 0;
1514
1515 again:
1516 dout("aio_read %p %llx.%llx %llu~%u trying to get caps on %p\n",
1517 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len, inode);
1518
1519 if (iocb->ki_flags & IOCB_DIRECT)
1520 ceph_start_io_direct(inode);
1521 else
1522 ceph_start_io_read(inode);
1523
1524 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1525 want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
1526 else
1527 want = CEPH_CAP_FILE_CACHE;
1528 ret = ceph_get_caps(filp, CEPH_CAP_FILE_RD, want, -1,
1529 &got, &pinned_page);
1530 if (ret < 0) {
1531 if (iocb->ki_flags & IOCB_DIRECT)
1532 ceph_end_io_direct(inode);
1533 else
1534 ceph_end_io_read(inode);
1535 return ret;
1536 }
1537
1538 if ((got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0 ||
1539 (iocb->ki_flags & IOCB_DIRECT) ||
1540 (fi->flags & CEPH_F_SYNC)) {
1541
1542 dout("aio_sync_read %p %llx.%llx %llu~%u got cap refs on %s\n",
1543 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
1544 ceph_cap_string(got));
1545
1546 if (ci->i_inline_version == CEPH_INLINE_NONE) {
1547 if (!retry_op && (iocb->ki_flags & IOCB_DIRECT)) {
1548 ret = ceph_direct_read_write(iocb, to,
1549 NULL, NULL);
1550 if (ret >= 0 && ret < len)
1551 retry_op = CHECK_EOF;
1552 } else {
1553 ret = ceph_sync_read(iocb, to, &retry_op);
1554 }
1555 } else {
1556 retry_op = READ_INLINE;
1557 }
1558 } else {
1559 CEPH_DEFINE_RW_CONTEXT(rw_ctx, got);
1560 dout("aio_read %p %llx.%llx %llu~%u got cap refs on %s\n",
1561 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
1562 ceph_cap_string(got));
1563 ceph_add_rw_context(fi, &rw_ctx);
1564 ret = generic_file_read_iter(iocb, to);
1565 ceph_del_rw_context(fi, &rw_ctx);
1566 }
1567
1568 dout("aio_read %p %llx.%llx dropping cap refs on %s = %d\n",
1569 inode, ceph_vinop(inode), ceph_cap_string(got), (int)ret);
1570 if (pinned_page) {
1571 put_page(pinned_page);
1572 pinned_page = NULL;
1573 }
1574 ceph_put_cap_refs(ci, got);
1575
1576 if (iocb->ki_flags & IOCB_DIRECT)
1577 ceph_end_io_direct(inode);
1578 else
1579 ceph_end_io_read(inode);
1580
1581 if (retry_op > HAVE_RETRIED && ret >= 0) {
1582 int statret;
1583 struct page *page = NULL;
1584 loff_t i_size;
1585 if (retry_op == READ_INLINE) {
1586 page = __page_cache_alloc(GFP_KERNEL);
1587 if (!page)
1588 return -ENOMEM;
1589 }
1590
1591 statret = __ceph_do_getattr(inode, page,
1592 CEPH_STAT_CAP_INLINE_DATA, !!page);
1593 if (statret < 0) {
1594 if (page)
1595 __free_page(page);
1596 if (statret == -ENODATA) {
1597 BUG_ON(retry_op != READ_INLINE);
1598 goto again;
1599 }
1600 return statret;
1601 }
1602
1603 i_size = i_size_read(inode);
1604 if (retry_op == READ_INLINE) {
1605 BUG_ON(ret > 0 || read > 0);
1606 if (iocb->ki_pos < i_size &&
1607 iocb->ki_pos < PAGE_SIZE) {
1608 loff_t end = min_t(loff_t, i_size,
1609 iocb->ki_pos + len);
1610 end = min_t(loff_t, end, PAGE_SIZE);
1611 if (statret < end)
1612 zero_user_segment(page, statret, end);
1613 ret = copy_page_to_iter(page,
1614 iocb->ki_pos & ~PAGE_MASK,
1615 end - iocb->ki_pos, to);
1616 iocb->ki_pos += ret;
1617 read += ret;
1618 }
1619 if (iocb->ki_pos < i_size && read < len) {
1620 size_t zlen = min_t(size_t, len - read,
1621 i_size - iocb->ki_pos);
1622 ret = iov_iter_zero(zlen, to);
1623 iocb->ki_pos += ret;
1624 read += ret;
1625 }
1626 __free_pages(page, 0);
1627 return read;
1628 }
1629
1630 /* hit EOF or hole? */
1631 if (retry_op == CHECK_EOF && iocb->ki_pos < i_size &&
1632 ret < len) {
1633 dout("sync_read hit hole, ppos %lld < size %lld"
1634 ", reading more\n", iocb->ki_pos, i_size);
1635
1636 read += ret;
1637 len -= ret;
1638 retry_op = HAVE_RETRIED;
1639 goto again;
1640 }
1641 }
1642
1643 if (ret >= 0)
1644 ret += read;
1645
1646 return ret;
1647 }
1648
1649 /*
1650 * Take cap references to avoid releasing caps to MDS mid-write.
1651 *
1652 * If we are synchronous, and write with an old snap context, the OSD
1653 * may return EOLDSNAPC. In that case, retry the write.. _after_
1654 * dropping our cap refs and allowing the pending snap to logically
1655 * complete _before_ this write occurs.
1656 *
1657 * If we are near ENOSPC, write synchronously.
1658 */
1659 static ssize_t ceph_write_iter(struct kiocb *iocb, struct iov_iter *from)
1660 {
1661 struct file *file = iocb->ki_filp;
1662 struct ceph_file_info *fi = file->private_data;
1663 struct inode *inode = file_inode(file);
1664 struct ceph_inode_info *ci = ceph_inode(inode);
1665 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1666 struct ceph_osd_client *osdc = &fsc->client->osdc;
1667 struct ceph_cap_flush *prealloc_cf;
1668 ssize_t count, written = 0;
1669 int err, want, got;
1670 bool direct_lock = false;
1671 u32 map_flags;
1672 u64 pool_flags;
1673 loff_t pos;
1674 loff_t limit = max(i_size_read(inode), fsc->max_file_size);
1675
1676 if (ceph_snap(inode) != CEPH_NOSNAP)
1677 return -EROFS;
1678
1679 prealloc_cf = ceph_alloc_cap_flush();
1680 if (!prealloc_cf)
1681 return -ENOMEM;
1682
1683 if ((iocb->ki_flags & (IOCB_DIRECT | IOCB_APPEND)) == IOCB_DIRECT)
1684 direct_lock = true;
1685
1686 retry_snap:
1687 if (direct_lock)
1688 ceph_start_io_direct(inode);
1689 else
1690 ceph_start_io_write(inode);
1691
1692 /* We can write back this queue in page reclaim */
1693 current->backing_dev_info = inode_to_bdi(inode);
1694
1695 if (iocb->ki_flags & IOCB_APPEND) {
1696 err = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false);
1697 if (err < 0)
1698 goto out;
1699 }
1700
1701 err = generic_write_checks(iocb, from);
1702 if (err <= 0)
1703 goto out;
1704
1705 pos = iocb->ki_pos;
1706 if (unlikely(pos >= limit)) {
1707 err = -EFBIG;
1708 goto out;
1709 } else {
1710 iov_iter_truncate(from, limit - pos);
1711 }
1712
1713 count = iov_iter_count(from);
1714 if (ceph_quota_is_max_bytes_exceeded(inode, pos + count)) {
1715 err = -EDQUOT;
1716 goto out;
1717 }
1718
1719 err = file_remove_privs(file);
1720 if (err)
1721 goto out;
1722
1723 err = file_update_time(file);
1724 if (err)
1725 goto out;
1726
1727 inode_inc_iversion_raw(inode);
1728
1729 if (ci->i_inline_version != CEPH_INLINE_NONE) {
1730 err = ceph_uninline_data(file, NULL);
1731 if (err < 0)
1732 goto out;
1733 }
1734
1735 down_read(&osdc->lock);
1736 map_flags = osdc->osdmap->flags;
1737 pool_flags = ceph_pg_pool_flags(osdc->osdmap, ci->i_layout.pool_id);
1738 up_read(&osdc->lock);
1739 if ((map_flags & CEPH_OSDMAP_FULL) ||
1740 (pool_flags & CEPH_POOL_FLAG_FULL)) {
1741 err = -ENOSPC;
1742 goto out;
1743 }
1744
1745 dout("aio_write %p %llx.%llx %llu~%zd getting caps. i_size %llu\n",
1746 inode, ceph_vinop(inode), pos, count, i_size_read(inode));
1747 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1748 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
1749 else
1750 want = CEPH_CAP_FILE_BUFFER;
1751 got = 0;
1752 err = ceph_get_caps(file, CEPH_CAP_FILE_WR, want, pos + count,
1753 &got, NULL);
1754 if (err < 0)
1755 goto out;
1756
1757 dout("aio_write %p %llx.%llx %llu~%zd got cap refs on %s\n",
1758 inode, ceph_vinop(inode), pos, count, ceph_cap_string(got));
1759
1760 if ((got & (CEPH_CAP_FILE_BUFFER|CEPH_CAP_FILE_LAZYIO)) == 0 ||
1761 (iocb->ki_flags & IOCB_DIRECT) || (fi->flags & CEPH_F_SYNC) ||
1762 (ci->i_ceph_flags & CEPH_I_ERROR_WRITE)) {
1763 struct ceph_snap_context *snapc;
1764 struct iov_iter data;
1765
1766 spin_lock(&ci->i_ceph_lock);
1767 if (__ceph_have_pending_cap_snap(ci)) {
1768 struct ceph_cap_snap *capsnap =
1769 list_last_entry(&ci->i_cap_snaps,
1770 struct ceph_cap_snap,
1771 ci_item);
1772 snapc = ceph_get_snap_context(capsnap->context);
1773 } else {
1774 BUG_ON(!ci->i_head_snapc);
1775 snapc = ceph_get_snap_context(ci->i_head_snapc);
1776 }
1777 spin_unlock(&ci->i_ceph_lock);
1778
1779 /* we might need to revert back to that point */
1780 data = *from;
1781 if (iocb->ki_flags & IOCB_DIRECT)
1782 written = ceph_direct_read_write(iocb, &data, snapc,
1783 &prealloc_cf);
1784 else
1785 written = ceph_sync_write(iocb, &data, pos, snapc);
1786 if (direct_lock)
1787 ceph_end_io_direct(inode);
1788 else
1789 ceph_end_io_write(inode);
1790 if (written > 0)
1791 iov_iter_advance(from, written);
1792 ceph_put_snap_context(snapc);
1793 } else {
1794 /*
1795 * No need to acquire the i_truncate_mutex. Because
1796 * the MDS revokes Fwb caps before sending truncate
1797 * message to us. We can't get Fwb cap while there
1798 * are pending vmtruncate. So write and vmtruncate
1799 * can not run at the same time
1800 */
1801 written = generic_perform_write(file, from, pos);
1802 if (likely(written >= 0))
1803 iocb->ki_pos = pos + written;
1804 ceph_end_io_write(inode);
1805 }
1806
1807 if (written >= 0) {
1808 int dirty;
1809
1810 spin_lock(&ci->i_ceph_lock);
1811 ci->i_inline_version = CEPH_INLINE_NONE;
1812 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
1813 &prealloc_cf);
1814 spin_unlock(&ci->i_ceph_lock);
1815 if (dirty)
1816 __mark_inode_dirty(inode, dirty);
1817 if (ceph_quota_is_max_bytes_approaching(inode, iocb->ki_pos))
1818 ceph_check_caps(ci, 0, NULL);
1819 }
1820
1821 dout("aio_write %p %llx.%llx %llu~%u dropping cap refs on %s\n",
1822 inode, ceph_vinop(inode), pos, (unsigned)count,
1823 ceph_cap_string(got));
1824 ceph_put_cap_refs(ci, got);
1825
1826 if (written == -EOLDSNAPC) {
1827 dout("aio_write %p %llx.%llx %llu~%u" "got EOLDSNAPC, retrying\n",
1828 inode, ceph_vinop(inode), pos, (unsigned)count);
1829 goto retry_snap;
1830 }
1831
1832 if (written >= 0) {
1833 if ((map_flags & CEPH_OSDMAP_NEARFULL) ||
1834 (pool_flags & CEPH_POOL_FLAG_NEARFULL))
1835 iocb->ki_flags |= IOCB_DSYNC;
1836 written = generic_write_sync(iocb, written);
1837 }
1838
1839 goto out_unlocked;
1840 out:
1841 if (direct_lock)
1842 ceph_end_io_direct(inode);
1843 else
1844 ceph_end_io_write(inode);
1845 out_unlocked:
1846 ceph_free_cap_flush(prealloc_cf);
1847 current->backing_dev_info = NULL;
1848 return written ? written : err;
1849 }
1850
1851 /*
1852 * llseek. be sure to verify file size on SEEK_END.
1853 */
1854 static loff_t ceph_llseek(struct file *file, loff_t offset, int whence)
1855 {
1856 struct inode *inode = file->f_mapping->host;
1857 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1858 loff_t i_size;
1859 loff_t ret;
1860
1861 inode_lock(inode);
1862
1863 if (whence == SEEK_END || whence == SEEK_DATA || whence == SEEK_HOLE) {
1864 ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false);
1865 if (ret < 0)
1866 goto out;
1867 }
1868
1869 i_size = i_size_read(inode);
1870 switch (whence) {
1871 case SEEK_END:
1872 offset += i_size;
1873 break;
1874 case SEEK_CUR:
1875 /*
1876 * Here we special-case the lseek(fd, 0, SEEK_CUR)
1877 * position-querying operation. Avoid rewriting the "same"
1878 * f_pos value back to the file because a concurrent read(),
1879 * write() or lseek() might have altered it
1880 */
1881 if (offset == 0) {
1882 ret = file->f_pos;
1883 goto out;
1884 }
1885 offset += file->f_pos;
1886 break;
1887 case SEEK_DATA:
1888 if (offset < 0 || offset >= i_size) {
1889 ret = -ENXIO;
1890 goto out;
1891 }
1892 break;
1893 case SEEK_HOLE:
1894 if (offset < 0 || offset >= i_size) {
1895 ret = -ENXIO;
1896 goto out;
1897 }
1898 offset = i_size;
1899 break;
1900 }
1901
1902 ret = vfs_setpos(file, offset, max(i_size, fsc->max_file_size));
1903
1904 out:
1905 inode_unlock(inode);
1906 return ret;
1907 }
1908
1909 static inline void ceph_zero_partial_page(
1910 struct inode *inode, loff_t offset, unsigned size)
1911 {
1912 struct page *page;
1913 pgoff_t index = offset >> PAGE_SHIFT;
1914
1915 page = find_lock_page(inode->i_mapping, index);
1916 if (page) {
1917 wait_on_page_writeback(page);
1918 zero_user(page, offset & (PAGE_SIZE - 1), size);
1919 unlock_page(page);
1920 put_page(page);
1921 }
1922 }
1923
1924 static void ceph_zero_pagecache_range(struct inode *inode, loff_t offset,
1925 loff_t length)
1926 {
1927 loff_t nearly = round_up(offset, PAGE_SIZE);
1928 if (offset < nearly) {
1929 loff_t size = nearly - offset;
1930 if (length < size)
1931 size = length;
1932 ceph_zero_partial_page(inode, offset, size);
1933 offset += size;
1934 length -= size;
1935 }
1936 if (length >= PAGE_SIZE) {
1937 loff_t size = round_down(length, PAGE_SIZE);
1938 truncate_pagecache_range(inode, offset, offset + size - 1);
1939 offset += size;
1940 length -= size;
1941 }
1942 if (length)
1943 ceph_zero_partial_page(inode, offset, length);
1944 }
1945
1946 static int ceph_zero_partial_object(struct inode *inode,
1947 loff_t offset, loff_t *length)
1948 {
1949 struct ceph_inode_info *ci = ceph_inode(inode);
1950 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1951 struct ceph_osd_request *req;
1952 int ret = 0;
1953 loff_t zero = 0;
1954 int op;
1955
1956 if (!length) {
1957 op = offset ? CEPH_OSD_OP_DELETE : CEPH_OSD_OP_TRUNCATE;
1958 length = &zero;
1959 } else {
1960 op = CEPH_OSD_OP_ZERO;
1961 }
1962
1963 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1964 ceph_vino(inode),
1965 offset, length,
1966 0, 1, op,
1967 CEPH_OSD_FLAG_WRITE,
1968 NULL, 0, 0, false);
1969 if (IS_ERR(req)) {
1970 ret = PTR_ERR(req);
1971 goto out;
1972 }
1973
1974 req->r_mtime = inode->i_mtime;
1975 ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
1976 if (!ret) {
1977 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
1978 if (ret == -ENOENT)
1979 ret = 0;
1980 }
1981 ceph_osdc_put_request(req);
1982
1983 out:
1984 return ret;
1985 }
1986
1987 static int ceph_zero_objects(struct inode *inode, loff_t offset, loff_t length)
1988 {
1989 int ret = 0;
1990 struct ceph_inode_info *ci = ceph_inode(inode);
1991 s32 stripe_unit = ci->i_layout.stripe_unit;
1992 s32 stripe_count = ci->i_layout.stripe_count;
1993 s32 object_size = ci->i_layout.object_size;
1994 u64 object_set_size = object_size * stripe_count;
1995 u64 nearly, t;
1996
1997 /* round offset up to next period boundary */
1998 nearly = offset + object_set_size - 1;
1999 t = nearly;
2000 nearly -= do_div(t, object_set_size);
2001
2002 while (length && offset < nearly) {
2003 loff_t size = length;
2004 ret = ceph_zero_partial_object(inode, offset, &size);
2005 if (ret < 0)
2006 return ret;
2007 offset += size;
2008 length -= size;
2009 }
2010 while (length >= object_set_size) {
2011 int i;
2012 loff_t pos = offset;
2013 for (i = 0; i < stripe_count; ++i) {
2014 ret = ceph_zero_partial_object(inode, pos, NULL);
2015 if (ret < 0)
2016 return ret;
2017 pos += stripe_unit;
2018 }
2019 offset += object_set_size;
2020 length -= object_set_size;
2021 }
2022 while (length) {
2023 loff_t size = length;
2024 ret = ceph_zero_partial_object(inode, offset, &size);
2025 if (ret < 0)
2026 return ret;
2027 offset += size;
2028 length -= size;
2029 }
2030 return ret;
2031 }
2032
2033 static long ceph_fallocate(struct file *file, int mode,
2034 loff_t offset, loff_t length)
2035 {
2036 struct ceph_file_info *fi = file->private_data;
2037 struct inode *inode = file_inode(file);
2038 struct ceph_inode_info *ci = ceph_inode(inode);
2039 struct ceph_cap_flush *prealloc_cf;
2040 int want, got = 0;
2041 int dirty;
2042 int ret = 0;
2043 loff_t endoff = 0;
2044 loff_t size;
2045
2046 if (mode != (FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
2047 return -EOPNOTSUPP;
2048
2049 if (!S_ISREG(inode->i_mode))
2050 return -EOPNOTSUPP;
2051
2052 prealloc_cf = ceph_alloc_cap_flush();
2053 if (!prealloc_cf)
2054 return -ENOMEM;
2055
2056 inode_lock(inode);
2057
2058 if (ceph_snap(inode) != CEPH_NOSNAP) {
2059 ret = -EROFS;
2060 goto unlock;
2061 }
2062
2063 if (ci->i_inline_version != CEPH_INLINE_NONE) {
2064 ret = ceph_uninline_data(file, NULL);
2065 if (ret < 0)
2066 goto unlock;
2067 }
2068
2069 size = i_size_read(inode);
2070
2071 /* Are we punching a hole beyond EOF? */
2072 if (offset >= size)
2073 goto unlock;
2074 if ((offset + length) > size)
2075 length = size - offset;
2076
2077 if (fi->fmode & CEPH_FILE_MODE_LAZY)
2078 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
2079 else
2080 want = CEPH_CAP_FILE_BUFFER;
2081
2082 ret = ceph_get_caps(file, CEPH_CAP_FILE_WR, want, endoff, &got, NULL);
2083 if (ret < 0)
2084 goto unlock;
2085
2086 ceph_zero_pagecache_range(inode, offset, length);
2087 ret = ceph_zero_objects(inode, offset, length);
2088
2089 if (!ret) {
2090 spin_lock(&ci->i_ceph_lock);
2091 ci->i_inline_version = CEPH_INLINE_NONE;
2092 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
2093 &prealloc_cf);
2094 spin_unlock(&ci->i_ceph_lock);
2095 if (dirty)
2096 __mark_inode_dirty(inode, dirty);
2097 }
2098
2099 ceph_put_cap_refs(ci, got);
2100 unlock:
2101 inode_unlock(inode);
2102 ceph_free_cap_flush(prealloc_cf);
2103 return ret;
2104 }
2105
2106 /*
2107 * This function tries to get FILE_WR capabilities for dst_ci and FILE_RD for
2108 * src_ci. Two attempts are made to obtain both caps, and an error is return if
2109 * this fails; zero is returned on success.
2110 */
2111 static int get_rd_wr_caps(struct file *src_filp, int *src_got,
2112 struct file *dst_filp,
2113 loff_t dst_endoff, int *dst_got)
2114 {
2115 int ret = 0;
2116 bool retrying = false;
2117
2118 retry_caps:
2119 ret = ceph_get_caps(dst_filp, CEPH_CAP_FILE_WR, CEPH_CAP_FILE_BUFFER,
2120 dst_endoff, dst_got, NULL);
2121 if (ret < 0)
2122 return ret;
2123
2124 /*
2125 * Since we're already holding the FILE_WR capability for the dst file,
2126 * we would risk a deadlock by using ceph_get_caps. Thus, we'll do some
2127 * retry dance instead to try to get both capabilities.
2128 */
2129 ret = ceph_try_get_caps(file_inode(src_filp),
2130 CEPH_CAP_FILE_RD, CEPH_CAP_FILE_SHARED,
2131 false, src_got);
2132 if (ret <= 0) {
2133 /* Start by dropping dst_ci caps and getting src_ci caps */
2134 ceph_put_cap_refs(ceph_inode(file_inode(dst_filp)), *dst_got);
2135 if (retrying) {
2136 if (!ret)
2137 /* ceph_try_get_caps masks EAGAIN */
2138 ret = -EAGAIN;
2139 return ret;
2140 }
2141 ret = ceph_get_caps(src_filp, CEPH_CAP_FILE_RD,
2142 CEPH_CAP_FILE_SHARED, -1, src_got, NULL);
2143 if (ret < 0)
2144 return ret;
2145 /*... drop src_ci caps too, and retry */
2146 ceph_put_cap_refs(ceph_inode(file_inode(src_filp)), *src_got);
2147 retrying = true;
2148 goto retry_caps;
2149 }
2150 return ret;
2151 }
2152
2153 static void put_rd_wr_caps(struct ceph_inode_info *src_ci, int src_got,
2154 struct ceph_inode_info *dst_ci, int dst_got)
2155 {
2156 ceph_put_cap_refs(src_ci, src_got);
2157 ceph_put_cap_refs(dst_ci, dst_got);
2158 }
2159
2160 /*
2161 * This function does several size-related checks, returning an error if:
2162 * - source file is smaller than off+len
2163 * - destination file size is not OK (inode_newsize_ok())
2164 * - max bytes quotas is exceeded
2165 */
2166 static int is_file_size_ok(struct inode *src_inode, struct inode *dst_inode,
2167 loff_t src_off, loff_t dst_off, size_t len)
2168 {
2169 loff_t size, endoff;
2170
2171 size = i_size_read(src_inode);
2172 /*
2173 * Don't copy beyond source file EOF. Instead of simply setting length
2174 * to (size - src_off), just drop to VFS default implementation, as the
2175 * local i_size may be stale due to other clients writing to the source
2176 * inode.
2177 */
2178 if (src_off + len > size) {
2179 dout("Copy beyond EOF (%llu + %zu > %llu)\n",
2180 src_off, len, size);
2181 return -EOPNOTSUPP;
2182 }
2183 size = i_size_read(dst_inode);
2184
2185 endoff = dst_off + len;
2186 if (inode_newsize_ok(dst_inode, endoff))
2187 return -EOPNOTSUPP;
2188
2189 if (ceph_quota_is_max_bytes_exceeded(dst_inode, endoff))
2190 return -EDQUOT;
2191
2192 return 0;
2193 }
2194
2195 static ssize_t ceph_do_objects_copy(struct ceph_inode_info *src_ci, u64 *src_off,
2196 struct ceph_inode_info *dst_ci, u64 *dst_off,
2197 struct ceph_fs_client *fsc,
2198 size_t len, unsigned int flags)
2199 {
2200 struct ceph_object_locator src_oloc, dst_oloc;
2201 struct ceph_object_id src_oid, dst_oid;
2202 size_t bytes = 0;
2203 u64 src_objnum, src_objoff, dst_objnum, dst_objoff;
2204 u32 src_objlen, dst_objlen;
2205 u32 object_size = src_ci->i_layout.object_size;
2206 int ret;
2207
2208 src_oloc.pool = src_ci->i_layout.pool_id;
2209 src_oloc.pool_ns = ceph_try_get_string(src_ci->i_layout.pool_ns);
2210 dst_oloc.pool = dst_ci->i_layout.pool_id;
2211 dst_oloc.pool_ns = ceph_try_get_string(dst_ci->i_layout.pool_ns);
2212
2213 while (len >= object_size) {
2214 ceph_calc_file_object_mapping(&src_ci->i_layout, *src_off,
2215 object_size, &src_objnum,
2216 &src_objoff, &src_objlen);
2217 ceph_calc_file_object_mapping(&dst_ci->i_layout, *dst_off,
2218 object_size, &dst_objnum,
2219 &dst_objoff, &dst_objlen);
2220 ceph_oid_init(&src_oid);
2221 ceph_oid_printf(&src_oid, "%llx.%08llx",
2222 src_ci->i_vino.ino, src_objnum);
2223 ceph_oid_init(&dst_oid);
2224 ceph_oid_printf(&dst_oid, "%llx.%08llx",
2225 dst_ci->i_vino.ino, dst_objnum);
2226 /* Do an object remote copy */
2227 ret = ceph_osdc_copy_from(&fsc->client->osdc,
2228 src_ci->i_vino.snap, 0,
2229 &src_oid, &src_oloc,
2230 CEPH_OSD_OP_FLAG_FADVISE_SEQUENTIAL |
2231 CEPH_OSD_OP_FLAG_FADVISE_NOCACHE,
2232 &dst_oid, &dst_oloc,
2233 CEPH_OSD_OP_FLAG_FADVISE_SEQUENTIAL |
2234 CEPH_OSD_OP_FLAG_FADVISE_DONTNEED,
2235 dst_ci->i_truncate_seq,
2236 dst_ci->i_truncate_size,
2237 CEPH_OSD_COPY_FROM_FLAG_TRUNCATE_SEQ);
2238 if (ret) {
2239 if (ret == -EOPNOTSUPP) {
2240 fsc->have_copy_from2 = false;
2241 pr_notice("OSDs don't support copy-from2; disabling copy offload\n");
2242 }
2243 dout("ceph_osdc_copy_from returned %d\n", ret);
2244 if (!bytes)
2245 bytes = ret;
2246 goto out;
2247 }
2248 len -= object_size;
2249 bytes += object_size;
2250 *src_off += object_size;
2251 *dst_off += object_size;
2252 }
2253
2254 out:
2255 ceph_oloc_destroy(&src_oloc);
2256 ceph_oloc_destroy(&dst_oloc);
2257 return bytes;
2258 }
2259
2260 static ssize_t __ceph_copy_file_range(struct file *src_file, loff_t src_off,
2261 struct file *dst_file, loff_t dst_off,
2262 size_t len, unsigned int flags)
2263 {
2264 struct inode *src_inode = file_inode(src_file);
2265 struct inode *dst_inode = file_inode(dst_file);
2266 struct ceph_inode_info *src_ci = ceph_inode(src_inode);
2267 struct ceph_inode_info *dst_ci = ceph_inode(dst_inode);
2268 struct ceph_cap_flush *prealloc_cf;
2269 struct ceph_fs_client *src_fsc = ceph_inode_to_client(src_inode);
2270 loff_t size;
2271 ssize_t ret = -EIO, bytes;
2272 u64 src_objnum, dst_objnum, src_objoff, dst_objoff;
2273 u32 src_objlen, dst_objlen;
2274 int src_got = 0, dst_got = 0, err, dirty;
2275
2276 if (src_inode->i_sb != dst_inode->i_sb) {
2277 struct ceph_fs_client *dst_fsc = ceph_inode_to_client(dst_inode);
2278
2279 if (ceph_fsid_compare(&src_fsc->client->fsid,
2280 &dst_fsc->client->fsid)) {
2281 dout("Copying files across clusters: src: %pU dst: %pU\n",
2282 &src_fsc->client->fsid, &dst_fsc->client->fsid);
2283 return -EXDEV;
2284 }
2285 }
2286 if (ceph_snap(dst_inode) != CEPH_NOSNAP)
2287 return -EROFS;
2288
2289 /*
2290 * Some of the checks below will return -EOPNOTSUPP, which will force a
2291 * fallback to the default VFS copy_file_range implementation. This is
2292 * desirable in several cases (for ex, the 'len' is smaller than the
2293 * size of the objects, or in cases where that would be more
2294 * efficient).
2295 */
2296
2297 if (ceph_test_mount_opt(src_fsc, NOCOPYFROM))
2298 return -EOPNOTSUPP;
2299
2300 if (!src_fsc->have_copy_from2)
2301 return -EOPNOTSUPP;
2302
2303 /*
2304 * Striped file layouts require that we copy partial objects, but the
2305 * OSD copy-from operation only supports full-object copies. Limit
2306 * this to non-striped file layouts for now.
2307 */
2308 if ((src_ci->i_layout.stripe_unit != dst_ci->i_layout.stripe_unit) ||
2309 (src_ci->i_layout.stripe_count != 1) ||
2310 (dst_ci->i_layout.stripe_count != 1) ||
2311 (src_ci->i_layout.object_size != dst_ci->i_layout.object_size)) {
2312 dout("Invalid src/dst files layout\n");
2313 return -EOPNOTSUPP;
2314 }
2315
2316 if (len < src_ci->i_layout.object_size)
2317 return -EOPNOTSUPP; /* no remote copy will be done */
2318
2319 prealloc_cf = ceph_alloc_cap_flush();
2320 if (!prealloc_cf)
2321 return -ENOMEM;
2322
2323 /* Start by sync'ing the source and destination files */
2324 ret = file_write_and_wait_range(src_file, src_off, (src_off + len));
2325 if (ret < 0) {
2326 dout("failed to write src file (%zd)\n", ret);
2327 goto out;
2328 }
2329 ret = file_write_and_wait_range(dst_file, dst_off, (dst_off + len));
2330 if (ret < 0) {
2331 dout("failed to write dst file (%zd)\n", ret);
2332 goto out;
2333 }
2334
2335 /*
2336 * We need FILE_WR caps for dst_ci and FILE_RD for src_ci as other
2337 * clients may have dirty data in their caches. And OSDs know nothing
2338 * about caps, so they can't safely do the remote object copies.
2339 */
2340 err = get_rd_wr_caps(src_file, &src_got,
2341 dst_file, (dst_off + len), &dst_got);
2342 if (err < 0) {
2343 dout("get_rd_wr_caps returned %d\n", err);
2344 ret = -EOPNOTSUPP;
2345 goto out;
2346 }
2347
2348 ret = is_file_size_ok(src_inode, dst_inode, src_off, dst_off, len);
2349 if (ret < 0)
2350 goto out_caps;
2351
2352 /* Drop dst file cached pages */
2353 ret = invalidate_inode_pages2_range(dst_inode->i_mapping,
2354 dst_off >> PAGE_SHIFT,
2355 (dst_off + len) >> PAGE_SHIFT);
2356 if (ret < 0) {
2357 dout("Failed to invalidate inode pages (%zd)\n", ret);
2358 ret = 0; /* XXX */
2359 }
2360 ceph_calc_file_object_mapping(&src_ci->i_layout, src_off,
2361 src_ci->i_layout.object_size,
2362 &src_objnum, &src_objoff, &src_objlen);
2363 ceph_calc_file_object_mapping(&dst_ci->i_layout, dst_off,
2364 dst_ci->i_layout.object_size,
2365 &dst_objnum, &dst_objoff, &dst_objlen);
2366 /* object-level offsets need to the same */
2367 if (src_objoff != dst_objoff) {
2368 ret = -EOPNOTSUPP;
2369 goto out_caps;
2370 }
2371
2372 /*
2373 * Do a manual copy if the object offset isn't object aligned.
2374 * 'src_objlen' contains the bytes left until the end of the object,
2375 * starting at the src_off
2376 */
2377 if (src_objoff) {
2378 dout("Initial partial copy of %u bytes\n", src_objlen);
2379
2380 /*
2381 * we need to temporarily drop all caps as we'll be calling
2382 * {read,write}_iter, which will get caps again.
2383 */
2384 put_rd_wr_caps(src_ci, src_got, dst_ci, dst_got);
2385 ret = do_splice_direct(src_file, &src_off, dst_file,
2386 &dst_off, src_objlen, flags);
2387 /* Abort on short copies or on error */
2388 if (ret < src_objlen) {
2389 dout("Failed partial copy (%zd)\n", ret);
2390 goto out;
2391 }
2392 len -= ret;
2393 err = get_rd_wr_caps(src_file, &src_got,
2394 dst_file, (dst_off + len), &dst_got);
2395 if (err < 0)
2396 goto out;
2397 err = is_file_size_ok(src_inode, dst_inode,
2398 src_off, dst_off, len);
2399 if (err < 0)
2400 goto out_caps;
2401 }
2402
2403 size = i_size_read(dst_inode);
2404 bytes = ceph_do_objects_copy(src_ci, &src_off, dst_ci, &dst_off,
2405 src_fsc, len, flags);
2406 if (bytes <= 0) {
2407 if (!ret)
2408 ret = bytes;
2409 goto out_caps;
2410 }
2411 dout("Copied %zu bytes out of %zu\n", bytes, len);
2412 len -= bytes;
2413 ret += bytes;
2414
2415 file_update_time(dst_file);
2416 inode_inc_iversion_raw(dst_inode);
2417
2418 if (dst_off > size) {
2419 /* Let the MDS know about dst file size change */
2420 if (ceph_inode_set_size(dst_inode, dst_off) ||
2421 ceph_quota_is_max_bytes_approaching(dst_inode, dst_off))
2422 ceph_check_caps(dst_ci, CHECK_CAPS_AUTHONLY, NULL);
2423 }
2424 /* Mark Fw dirty */
2425 spin_lock(&dst_ci->i_ceph_lock);
2426 dst_ci->i_inline_version = CEPH_INLINE_NONE;
2427 dirty = __ceph_mark_dirty_caps(dst_ci, CEPH_CAP_FILE_WR, &prealloc_cf);
2428 spin_unlock(&dst_ci->i_ceph_lock);
2429 if (dirty)
2430 __mark_inode_dirty(dst_inode, dirty);
2431
2432 out_caps:
2433 put_rd_wr_caps(src_ci, src_got, dst_ci, dst_got);
2434
2435 /*
2436 * Do the final manual copy if we still have some bytes left, unless
2437 * there were errors in remote object copies (len >= object_size).
2438 */
2439 if (len && (len < src_ci->i_layout.object_size)) {
2440 dout("Final partial copy of %zu bytes\n", len);
2441 bytes = do_splice_direct(src_file, &src_off, dst_file,
2442 &dst_off, len, flags);
2443 if (bytes > 0)
2444 ret += bytes;
2445 else
2446 dout("Failed partial copy (%zd)\n", bytes);
2447 }
2448
2449 out:
2450 ceph_free_cap_flush(prealloc_cf);
2451
2452 return ret;
2453 }
2454
2455 static ssize_t ceph_copy_file_range(struct file *src_file, loff_t src_off,
2456 struct file *dst_file, loff_t dst_off,
2457 size_t len, unsigned int flags)
2458 {
2459 ssize_t ret;
2460
2461 ret = __ceph_copy_file_range(src_file, src_off, dst_file, dst_off,
2462 len, flags);
2463
2464 if (ret == -EOPNOTSUPP || ret == -EXDEV)
2465 ret = generic_copy_file_range(src_file, src_off, dst_file,
2466 dst_off, len, flags);
2467 return ret;
2468 }
2469
2470 const struct file_operations ceph_file_fops = {
2471 .open = ceph_open,
2472 .release = ceph_release,
2473 .llseek = ceph_llseek,
2474 .read_iter = ceph_read_iter,
2475 .write_iter = ceph_write_iter,
2476 .mmap = ceph_mmap,
2477 .fsync = ceph_fsync,
2478 .lock = ceph_lock,
2479 .flock = ceph_flock,
2480 .splice_read = generic_file_splice_read,
2481 .splice_write = iter_file_splice_write,
2482 .unlocked_ioctl = ceph_ioctl,
2483 .compat_ioctl = compat_ptr_ioctl,
2484 .fallocate = ceph_fallocate,
2485 .copy_file_range = ceph_copy_file_range,
2486 };
Linux with added FPC-III support