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btrfs: fix memory leaks after failure to lookup checksums during inode logging
[linux/fpc-iii.git] / fs / ceph / file.c
blobce54a1b12819b91a8c03a8db0b7d0ae5b480724e
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 ceph_put_fmode(ci, fmode); /* clean up */
217 return -ENOMEM;
218 }
219
220 file->private_data = dfi;
221 fi = &dfi->file_info;
222 dfi->next_offset = 2;
223 dfi->readdir_cache_idx = -1;
224 } else {
225 fi = kmem_cache_zalloc(ceph_file_cachep, GFP_KERNEL);
226 if (!fi) {
227 ceph_put_fmode(ci, fmode); /* clean up */
228 return -ENOMEM;
229 }
230
231 file->private_data = fi;
232 }
233
234 fi->fmode = fmode;
235 spin_lock_init(&fi->rw_contexts_lock);
236 INIT_LIST_HEAD(&fi->rw_contexts);
237 fi->meta_err = errseq_sample(&ci->i_meta_err);
238 fi->filp_gen = READ_ONCE(ceph_inode_to_client(inode)->filp_gen);
239
240 return 0;
241 }
242
243 /*
244 * initialize private struct file data.
245 * if we fail, clean up by dropping fmode reference on the ceph_inode
246 */
247 static int ceph_init_file(struct inode *inode, struct file *file, int fmode)
248 {
249 int ret = 0;
250
251 switch (inode->i_mode & S_IFMT) {
252 case S_IFREG:
253 ceph_fscache_register_inode_cookie(inode);
254 ceph_fscache_file_set_cookie(inode, file);
255 /* fall through */
256 case S_IFDIR:
257 ret = ceph_init_file_info(inode, file, fmode,
258 S_ISDIR(inode->i_mode));
259 if (ret)
260 return ret;
261 break;
262
263 case S_IFLNK:
264 dout("init_file %p %p 0%o (symlink)\n", inode, file,
265 inode->i_mode);
266 ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */
267 break;
268
269 default:
270 dout("init_file %p %p 0%o (special)\n", inode, file,
271 inode->i_mode);
272 /*
273 * we need to drop the open ref now, since we don't
274 * have .release set to ceph_release.
275 */
276 ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */
277 BUG_ON(inode->i_fop->release == ceph_release);
278
279 /* call the proper open fop */
280 ret = inode->i_fop->open(inode, file);
281 }
282 return ret;
283 }
284
285 /*
286 * try renew caps after session gets killed.
287 */
288 int ceph_renew_caps(struct inode *inode)
289 {
290 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
291 struct ceph_inode_info *ci = ceph_inode(inode);
292 struct ceph_mds_request *req;
293 int err, flags, wanted;
294
295 spin_lock(&ci->i_ceph_lock);
296 wanted = __ceph_caps_file_wanted(ci);
297 if (__ceph_is_any_real_caps(ci) &&
298 (!(wanted & CEPH_CAP_ANY_WR) || ci->i_auth_cap)) {
299 int issued = __ceph_caps_issued(ci, NULL);
300 spin_unlock(&ci->i_ceph_lock);
301 dout("renew caps %p want %s issued %s updating mds_wanted\n",
302 inode, ceph_cap_string(wanted), ceph_cap_string(issued));
303 ceph_check_caps(ci, 0, NULL);
304 return 0;
305 }
306 spin_unlock(&ci->i_ceph_lock);
307
308 flags = 0;
309 if ((wanted & CEPH_CAP_FILE_RD) && (wanted & CEPH_CAP_FILE_WR))
310 flags = O_RDWR;
311 else if (wanted & CEPH_CAP_FILE_RD)
312 flags = O_RDONLY;
313 else if (wanted & CEPH_CAP_FILE_WR)
314 flags = O_WRONLY;
315 #ifdef O_LAZY
316 if (wanted & CEPH_CAP_FILE_LAZYIO)
317 flags |= O_LAZY;
318 #endif
319
320 req = prepare_open_request(inode->i_sb, flags, 0);
321 if (IS_ERR(req)) {
322 err = PTR_ERR(req);
323 goto out;
324 }
325
326 req->r_inode = inode;
327 ihold(inode);
328 req->r_num_caps = 1;
329 req->r_fmode = -1;
330
331 err = ceph_mdsc_do_request(mdsc, NULL, req);
332 ceph_mdsc_put_request(req);
333 out:
334 dout("renew caps %p open result=%d\n", inode, err);
335 return err < 0 ? err : 0;
336 }
337
338 /*
339 * If we already have the requisite capabilities, we can satisfy
340 * the open request locally (no need to request new caps from the
341 * MDS). We do, however, need to inform the MDS (asynchronously)
342 * if our wanted caps set expands.
343 */
344 int ceph_open(struct inode *inode, struct file *file)
345 {
346 struct ceph_inode_info *ci = ceph_inode(inode);
347 struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
348 struct ceph_mds_client *mdsc = fsc->mdsc;
349 struct ceph_mds_request *req;
350 struct ceph_file_info *fi = file->private_data;
351 int err;
352 int flags, fmode, wanted;
353
354 if (fi) {
355 dout("open file %p is already opened\n", file);
356 return 0;
357 }
358
359 /* filter out O_CREAT|O_EXCL; vfs did that already. yuck. */
360 flags = file->f_flags & ~(O_CREAT|O_EXCL);
361 if (S_ISDIR(inode->i_mode))
362 flags = O_DIRECTORY; /* mds likes to know */
363
364 dout("open inode %p ino %llx.%llx file %p flags %d (%d)\n", inode,
365 ceph_vinop(inode), file, flags, file->f_flags);
366 fmode = ceph_flags_to_mode(flags);
367 wanted = ceph_caps_for_mode(fmode);
368
369 /* snapped files are read-only */
370 if (ceph_snap(inode) != CEPH_NOSNAP && (file->f_mode & FMODE_WRITE))
371 return -EROFS;
372
373 /* trivially open snapdir */
374 if (ceph_snap(inode) == CEPH_SNAPDIR) {
375 spin_lock(&ci->i_ceph_lock);
376 __ceph_get_fmode(ci, fmode);
377 spin_unlock(&ci->i_ceph_lock);
378 return ceph_init_file(inode, file, fmode);
379 }
380
381 /*
382 * No need to block if we have caps on the auth MDS (for
383 * write) or any MDS (for read). Update wanted set
384 * asynchronously.
385 */
386 spin_lock(&ci->i_ceph_lock);
387 if (__ceph_is_any_real_caps(ci) &&
388 (((fmode & CEPH_FILE_MODE_WR) == 0) || ci->i_auth_cap)) {
389 int mds_wanted = __ceph_caps_mds_wanted(ci, true);
390 int issued = __ceph_caps_issued(ci, NULL);
391
392 dout("open %p fmode %d want %s issued %s using existing\n",
393 inode, fmode, ceph_cap_string(wanted),
394 ceph_cap_string(issued));
395 __ceph_get_fmode(ci, fmode);
396 spin_unlock(&ci->i_ceph_lock);
397
398 /* adjust wanted? */
399 if ((issued & wanted) != wanted &&
400 (mds_wanted & wanted) != wanted &&
401 ceph_snap(inode) != CEPH_SNAPDIR)
402 ceph_check_caps(ci, 0, NULL);
403
404 return ceph_init_file(inode, file, fmode);
405 } else if (ceph_snap(inode) != CEPH_NOSNAP &&
406 (ci->i_snap_caps & wanted) == wanted) {
407 __ceph_get_fmode(ci, fmode);
408 spin_unlock(&ci->i_ceph_lock);
409 return ceph_init_file(inode, file, fmode);
410 }
411
412 spin_unlock(&ci->i_ceph_lock);
413
414 dout("open fmode %d wants %s\n", fmode, ceph_cap_string(wanted));
415 req = prepare_open_request(inode->i_sb, flags, 0);
416 if (IS_ERR(req)) {
417 err = PTR_ERR(req);
418 goto out;
419 }
420 req->r_inode = inode;
421 ihold(inode);
422
423 req->r_num_caps = 1;
424 err = ceph_mdsc_do_request(mdsc, NULL, req);
425 if (!err)
426 err = ceph_init_file(inode, file, req->r_fmode);
427 ceph_mdsc_put_request(req);
428 dout("open result=%d on %llx.%llx\n", err, ceph_vinop(inode));
429 out:
430 return err;
431 }
432
433
434 /*
435 * Do a lookup + open with a single request. If we get a non-existent
436 * file or symlink, return 1 so the VFS can retry.
437 */
438 int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
439 struct file *file, unsigned flags, umode_t mode)
440 {
441 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
442 struct ceph_mds_client *mdsc = fsc->mdsc;
443 struct ceph_mds_request *req;
444 struct dentry *dn;
445 struct ceph_acl_sec_ctx as_ctx = {};
446 int mask;
447 int err;
448
449 dout("atomic_open %p dentry %p '%pd' %s flags %d mode 0%o\n",
450 dir, dentry, dentry,
451 d_unhashed(dentry) ? "unhashed" : "hashed", flags, mode);
452
453 if (dentry->d_name.len > NAME_MAX)
454 return -ENAMETOOLONG;
455
456 if (flags & O_CREAT) {
457 if (ceph_quota_is_max_files_exceeded(dir))
458 return -EDQUOT;
459 err = ceph_pre_init_acls(dir, &mode, &as_ctx);
460 if (err < 0)
461 return err;
462 err = ceph_security_init_secctx(dentry, mode, &as_ctx);
463 if (err < 0)
464 goto out_ctx;
465 } else if (!d_in_lookup(dentry)) {
466 /* If it's not being looked up, it's negative */
467 return -ENOENT;
468 }
469
470 /* do the open */
471 req = prepare_open_request(dir->i_sb, flags, mode);
472 if (IS_ERR(req)) {
473 err = PTR_ERR(req);
474 goto out_ctx;
475 }
476 req->r_dentry = dget(dentry);
477 req->r_num_caps = 2;
478 if (flags & O_CREAT) {
479 req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL;
480 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
481 if (as_ctx.pagelist) {
482 req->r_pagelist = as_ctx.pagelist;
483 as_ctx.pagelist = NULL;
484 }
485 }
486
487 mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED;
488 if (ceph_security_xattr_wanted(dir))
489 mask |= CEPH_CAP_XATTR_SHARED;
490 req->r_args.open.mask = cpu_to_le32(mask);
491
492 req->r_parent = dir;
493 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
494 err = ceph_mdsc_do_request(mdsc,
495 (flags & (O_CREAT|O_TRUNC)) ? dir : NULL,
496 req);
497 err = ceph_handle_snapdir(req, dentry, err);
498 if (err)
499 goto out_req;
500
501 if ((flags & O_CREAT) && !req->r_reply_info.head->is_dentry)
502 err = ceph_handle_notrace_create(dir, dentry);
503
504 if (d_in_lookup(dentry)) {
505 dn = ceph_finish_lookup(req, dentry, err);
506 if (IS_ERR(dn))
507 err = PTR_ERR(dn);
508 } else {
509 /* we were given a hashed negative dentry */
510 dn = NULL;
511 }
512 if (err)
513 goto out_req;
514 if (dn || d_really_is_negative(dentry) || d_is_symlink(dentry)) {
515 /* make vfs retry on splice, ENOENT, or symlink */
516 dout("atomic_open finish_no_open on dn %p\n", dn);
517 err = finish_no_open(file, dn);
518 } else {
519 dout("atomic_open finish_open on dn %p\n", dn);
520 if (req->r_op == CEPH_MDS_OP_CREATE && req->r_reply_info.has_create_ino) {
521 ceph_init_inode_acls(d_inode(dentry), &as_ctx);
522 file->f_mode |= FMODE_CREATED;
523 }
524 err = finish_open(file, dentry, ceph_open);
525 }
526 out_req:
527 if (!req->r_err && req->r_target_inode)
528 ceph_put_fmode(ceph_inode(req->r_target_inode), req->r_fmode);
529 ceph_mdsc_put_request(req);
530 out_ctx:
531 ceph_release_acl_sec_ctx(&as_ctx);
532 dout("atomic_open result=%d\n", err);
533 return err;
534 }
535
536 int ceph_release(struct inode *inode, struct file *file)
537 {
538 struct ceph_inode_info *ci = ceph_inode(inode);
539
540 if (S_ISDIR(inode->i_mode)) {
541 struct ceph_dir_file_info *dfi = file->private_data;
542 dout("release inode %p dir file %p\n", inode, file);
543 WARN_ON(!list_empty(&dfi->file_info.rw_contexts));
544
545 ceph_put_fmode(ci, dfi->file_info.fmode);
546
547 if (dfi->last_readdir)
548 ceph_mdsc_put_request(dfi->last_readdir);
549 kfree(dfi->last_name);
550 kfree(dfi->dir_info);
551 kmem_cache_free(ceph_dir_file_cachep, dfi);
552 } else {
553 struct ceph_file_info *fi = file->private_data;
554 dout("release inode %p regular file %p\n", inode, file);
555 WARN_ON(!list_empty(&fi->rw_contexts));
556
557 ceph_put_fmode(ci, fi->fmode);
558 kmem_cache_free(ceph_file_cachep, fi);
559 }
560
561 /* wake up anyone waiting for caps on this inode */
562 wake_up_all(&ci->i_cap_wq);
563 return 0;
564 }
565
566 enum {
567 HAVE_RETRIED = 1,
568 CHECK_EOF = 2,
569 READ_INLINE = 3,
570 };
571
572 /*
573 * Completely synchronous read and write methods. Direct from __user
574 * buffer to osd, or directly to user pages (if O_DIRECT).
575 *
576 * If the read spans object boundary, just do multiple reads. (That's not
577 * atomic, but good enough for now.)
578 *
579 * If we get a short result from the OSD, check against i_size; we need to
580 * only return a short read to the caller if we hit EOF.
581 */
582 static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *to,
583 int *retry_op)
584 {
585 struct file *file = iocb->ki_filp;
586 struct inode *inode = file_inode(file);
587 struct ceph_inode_info *ci = ceph_inode(inode);
588 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
589 struct ceph_osd_client *osdc = &fsc->client->osdc;
590 ssize_t ret;
591 u64 off = iocb->ki_pos;
592 u64 len = iov_iter_count(to);
593
594 dout("sync_read on file %p %llu~%u %s\n", file, off, (unsigned)len,
595 (file->f_flags & O_DIRECT) ? "O_DIRECT" : "");
596
597 if (!len)
598 return 0;
599 /*
600 * flush any page cache pages in this range. this
601 * will make concurrent normal and sync io slow,
602 * but it will at least behave sensibly when they are
603 * in sequence.
604 */
605 ret = filemap_write_and_wait_range(inode->i_mapping,
606 off, off + len - 1);
607 if (ret < 0)
608 return ret;
609
610 ret = 0;
611 while ((len = iov_iter_count(to)) > 0) {
612 struct ceph_osd_request *req;
613 struct page **pages;
614 int num_pages;
615 size_t page_off;
616 u64 i_size;
617 bool more;
618
619 req = ceph_osdc_new_request(osdc, &ci->i_layout,
620 ci->i_vino, off, &len, 0, 1,
621 CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ,
622 NULL, ci->i_truncate_seq,
623 ci->i_truncate_size, false);
624 if (IS_ERR(req)) {
625 ret = PTR_ERR(req);
626 break;
627 }
628
629 more = len < iov_iter_count(to);
630
631 if (unlikely(iov_iter_is_pipe(to))) {
632 ret = iov_iter_get_pages_alloc(to, &pages, len,
633 &page_off);
634 if (ret <= 0) {
635 ceph_osdc_put_request(req);
636 ret = -ENOMEM;
637 break;
638 }
639 num_pages = DIV_ROUND_UP(ret + page_off, PAGE_SIZE);
640 if (ret < len) {
641 len = ret;
642 osd_req_op_extent_update(req, 0, len);
643 more = false;
644 }
645 } else {
646 num_pages = calc_pages_for(off, len);
647 page_off = off & ~PAGE_MASK;
648 pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL);
649 if (IS_ERR(pages)) {
650 ceph_osdc_put_request(req);
651 ret = PTR_ERR(pages);
652 break;
653 }
654 }
655
656 osd_req_op_extent_osd_data_pages(req, 0, pages, len, page_off,
657 false, false);
658 ret = ceph_osdc_start_request(osdc, req, false);
659 if (!ret)
660 ret = ceph_osdc_wait_request(osdc, req);
661 ceph_osdc_put_request(req);
662
663 i_size = i_size_read(inode);
664 dout("sync_read %llu~%llu got %zd i_size %llu%s\n",
665 off, len, ret, i_size, (more ? " MORE" : ""));
666
667 if (ret == -ENOENT)
668 ret = 0;
669 if (ret >= 0 && ret < len && (off + ret < i_size)) {
670 int zlen = min(len - ret, i_size - off - ret);
671 int zoff = page_off + ret;
672 dout("sync_read zero gap %llu~%llu\n",
673 off + ret, off + ret + zlen);
674 ceph_zero_page_vector_range(zoff, zlen, pages);
675 ret += zlen;
676 }
677
678 if (unlikely(iov_iter_is_pipe(to))) {
679 if (ret > 0) {
680 iov_iter_advance(to, ret);
681 off += ret;
682 } else {
683 iov_iter_advance(to, 0);
684 }
685 ceph_put_page_vector(pages, num_pages, false);
686 } else {
687 int idx = 0;
688 size_t left = ret > 0 ? ret : 0;
689 while (left > 0) {
690 size_t len, copied;
691 page_off = off & ~PAGE_MASK;
692 len = min_t(size_t, left, PAGE_SIZE - page_off);
693 copied = copy_page_to_iter(pages[idx++],
694 page_off, len, to);
695 off += copied;
696 left -= copied;
697 if (copied < len) {
698 ret = -EFAULT;
699 break;
700 }
701 }
702 ceph_release_page_vector(pages, num_pages);
703 }
704
705 if (ret < 0) {
706 if (ret == -EBLACKLISTED)
707 fsc->blacklisted = true;
708 break;
709 }
710
711 if (off >= i_size || !more)
712 break;
713 }
714
715 if (off > iocb->ki_pos) {
716 if (ret >= 0 &&
717 iov_iter_count(to) > 0 && off >= i_size_read(inode))
718 *retry_op = CHECK_EOF;
719 ret = off - iocb->ki_pos;
720 iocb->ki_pos = off;
721 }
722
723 dout("sync_read result %zd retry_op %d\n", ret, *retry_op);
724 return ret;
725 }
726
727 struct ceph_aio_request {
728 struct kiocb *iocb;
729 size_t total_len;
730 bool write;
731 bool should_dirty;
732 int error;
733 struct list_head osd_reqs;
734 unsigned num_reqs;
735 atomic_t pending_reqs;
736 struct timespec64 mtime;
737 struct ceph_cap_flush *prealloc_cf;
738 };
739
740 struct ceph_aio_work {
741 struct work_struct work;
742 struct ceph_osd_request *req;
743 };
744
745 static void ceph_aio_retry_work(struct work_struct *work);
746
747 static void ceph_aio_complete(struct inode *inode,
748 struct ceph_aio_request *aio_req)
749 {
750 struct ceph_inode_info *ci = ceph_inode(inode);
751 int ret;
752
753 if (!atomic_dec_and_test(&aio_req->pending_reqs))
754 return;
755
756 if (aio_req->iocb->ki_flags & IOCB_DIRECT)
757 inode_dio_end(inode);
758
759 ret = aio_req->error;
760 if (!ret)
761 ret = aio_req->total_len;
762
763 dout("ceph_aio_complete %p rc %d\n", inode, ret);
764
765 if (ret >= 0 && aio_req->write) {
766 int dirty;
767
768 loff_t endoff = aio_req->iocb->ki_pos + aio_req->total_len;
769 if (endoff > i_size_read(inode)) {
770 if (ceph_inode_set_size(inode, endoff))
771 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
772 }
773
774 spin_lock(&ci->i_ceph_lock);
775 ci->i_inline_version = CEPH_INLINE_NONE;
776 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
777 &aio_req->prealloc_cf);
778 spin_unlock(&ci->i_ceph_lock);
779 if (dirty)
780 __mark_inode_dirty(inode, dirty);
781
782 }
783
784 ceph_put_cap_refs(ci, (aio_req->write ? CEPH_CAP_FILE_WR :
785 CEPH_CAP_FILE_RD));
786
787 aio_req->iocb->ki_complete(aio_req->iocb, ret, 0);
788
789 ceph_free_cap_flush(aio_req->prealloc_cf);
790 kfree(aio_req);
791 }
792
793 static void ceph_aio_complete_req(struct ceph_osd_request *req)
794 {
795 int rc = req->r_result;
796 struct inode *inode = req->r_inode;
797 struct ceph_aio_request *aio_req = req->r_priv;
798 struct ceph_osd_data *osd_data = osd_req_op_extent_osd_data(req, 0);
799
800 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_BVECS);
801 BUG_ON(!osd_data->num_bvecs);
802
803 dout("ceph_aio_complete_req %p rc %d bytes %u\n",
804 inode, rc, osd_data->bvec_pos.iter.bi_size);
805
806 if (rc == -EOLDSNAPC) {
807 struct ceph_aio_work *aio_work;
808 BUG_ON(!aio_req->write);
809
810 aio_work = kmalloc(sizeof(*aio_work), GFP_NOFS);
811 if (aio_work) {
812 INIT_WORK(&aio_work->work, ceph_aio_retry_work);
813 aio_work->req = req;
814 queue_work(ceph_inode_to_client(inode)->inode_wq,
815 &aio_work->work);
816 return;
817 }
818 rc = -ENOMEM;
819 } else if (!aio_req->write) {
820 if (rc == -ENOENT)
821 rc = 0;
822 if (rc >= 0 && osd_data->bvec_pos.iter.bi_size > rc) {
823 struct iov_iter i;
824 int zlen = osd_data->bvec_pos.iter.bi_size - rc;
825
826 /*
827 * If read is satisfied by single OSD request,
828 * it can pass EOF. Otherwise read is within
829 * i_size.
830 */
831 if (aio_req->num_reqs == 1) {
832 loff_t i_size = i_size_read(inode);
833 loff_t endoff = aio_req->iocb->ki_pos + rc;
834 if (endoff < i_size)
835 zlen = min_t(size_t, zlen,
836 i_size - endoff);
837 aio_req->total_len = rc + zlen;
838 }
839
840 iov_iter_bvec(&i, READ, osd_data->bvec_pos.bvecs,
841 osd_data->num_bvecs,
842 osd_data->bvec_pos.iter.bi_size);
843 iov_iter_advance(&i, rc);
844 iov_iter_zero(zlen, &i);
845 }
846 }
847
848 put_bvecs(osd_data->bvec_pos.bvecs, osd_data->num_bvecs,
849 aio_req->should_dirty);
850 ceph_osdc_put_request(req);
851
852 if (rc < 0)
853 cmpxchg(&aio_req->error, 0, rc);
854
855 ceph_aio_complete(inode, aio_req);
856 return;
857 }
858
859 static void ceph_aio_retry_work(struct work_struct *work)
860 {
861 struct ceph_aio_work *aio_work =
862 container_of(work, struct ceph_aio_work, work);
863 struct ceph_osd_request *orig_req = aio_work->req;
864 struct ceph_aio_request *aio_req = orig_req->r_priv;
865 struct inode *inode = orig_req->r_inode;
866 struct ceph_inode_info *ci = ceph_inode(inode);
867 struct ceph_snap_context *snapc;
868 struct ceph_osd_request *req;
869 int ret;
870
871 spin_lock(&ci->i_ceph_lock);
872 if (__ceph_have_pending_cap_snap(ci)) {
873 struct ceph_cap_snap *capsnap =
874 list_last_entry(&ci->i_cap_snaps,
875 struct ceph_cap_snap,
876 ci_item);
877 snapc = ceph_get_snap_context(capsnap->context);
878 } else {
879 BUG_ON(!ci->i_head_snapc);
880 snapc = ceph_get_snap_context(ci->i_head_snapc);
881 }
882 spin_unlock(&ci->i_ceph_lock);
883
884 req = ceph_osdc_alloc_request(orig_req->r_osdc, snapc, 1,
885 false, GFP_NOFS);
886 if (!req) {
887 ret = -ENOMEM;
888 req = orig_req;
889 goto out;
890 }
891
892 req->r_flags = /* CEPH_OSD_FLAG_ORDERSNAP | */ CEPH_OSD_FLAG_WRITE;
893 ceph_oloc_copy(&req->r_base_oloc, &orig_req->r_base_oloc);
894 ceph_oid_copy(&req->r_base_oid, &orig_req->r_base_oid);
895
896 req->r_ops[0] = orig_req->r_ops[0];
897
898 req->r_mtime = aio_req->mtime;
899 req->r_data_offset = req->r_ops[0].extent.offset;
900
901 ret = ceph_osdc_alloc_messages(req, GFP_NOFS);
902 if (ret) {
903 ceph_osdc_put_request(req);
904 req = orig_req;
905 goto out;
906 }
907
908 ceph_osdc_put_request(orig_req);
909
910 req->r_callback = ceph_aio_complete_req;
911 req->r_inode = inode;
912 req->r_priv = aio_req;
913
914 ret = ceph_osdc_start_request(req->r_osdc, req, false);
915 out:
916 if (ret < 0) {
917 req->r_result = ret;
918 ceph_aio_complete_req(req);
919 }
920
921 ceph_put_snap_context(snapc);
922 kfree(aio_work);
923 }
924
925 static ssize_t
926 ceph_direct_read_write(struct kiocb *iocb, struct iov_iter *iter,
927 struct ceph_snap_context *snapc,
928 struct ceph_cap_flush **pcf)
929 {
930 struct file *file = iocb->ki_filp;
931 struct inode *inode = file_inode(file);
932 struct ceph_inode_info *ci = ceph_inode(inode);
933 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
934 struct ceph_vino vino;
935 struct ceph_osd_request *req;
936 struct bio_vec *bvecs;
937 struct ceph_aio_request *aio_req = NULL;
938 int num_pages = 0;
939 int flags;
940 int ret = 0;
941 struct timespec64 mtime = current_time(inode);
942 size_t count = iov_iter_count(iter);
943 loff_t pos = iocb->ki_pos;
944 bool write = iov_iter_rw(iter) == WRITE;
945 bool should_dirty = !write && iter_is_iovec(iter);
946
947 if (write && ceph_snap(file_inode(file)) != CEPH_NOSNAP)
948 return -EROFS;
949
950 dout("sync_direct_%s on file %p %lld~%u snapc %p seq %lld\n",
951 (write ? "write" : "read"), file, pos, (unsigned)count,
952 snapc, snapc ? snapc->seq : 0);
953
954 if (write) {
955 int ret2 = invalidate_inode_pages2_range(inode->i_mapping,
956 pos >> PAGE_SHIFT,
957 (pos + count - 1) >> PAGE_SHIFT);
958 if (ret2 < 0)
959 dout("invalidate_inode_pages2_range returned %d\n", ret2);
960
961 flags = /* CEPH_OSD_FLAG_ORDERSNAP | */ CEPH_OSD_FLAG_WRITE;
962 } else {
963 flags = CEPH_OSD_FLAG_READ;
964 }
965
966 while (iov_iter_count(iter) > 0) {
967 u64 size = iov_iter_count(iter);
968 ssize_t len;
969
970 if (write)
971 size = min_t(u64, size, fsc->mount_options->wsize);
972 else
973 size = min_t(u64, size, fsc->mount_options->rsize);
974
975 vino = ceph_vino(inode);
976 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
977 vino, pos, &size, 0,
978 1,
979 write ? CEPH_OSD_OP_WRITE :
980 CEPH_OSD_OP_READ,
981 flags, snapc,
982 ci->i_truncate_seq,
983 ci->i_truncate_size,
984 false);
985 if (IS_ERR(req)) {
986 ret = PTR_ERR(req);
987 break;
988 }
989
990 len = iter_get_bvecs_alloc(iter, size, &bvecs, &num_pages);
991 if (len < 0) {
992 ceph_osdc_put_request(req);
993 ret = len;
994 break;
995 }
996 if (len != size)
997 osd_req_op_extent_update(req, 0, len);
998
999 /*
1000 * To simplify error handling, allow AIO when IO within i_size
1001 * or IO can be satisfied by single OSD request.
1002 */
1003 if (pos == iocb->ki_pos && !is_sync_kiocb(iocb) &&
1004 (len == count || pos + count <= i_size_read(inode))) {
1005 aio_req = kzalloc(sizeof(*aio_req), GFP_KERNEL);
1006 if (aio_req) {
1007 aio_req->iocb = iocb;
1008 aio_req->write = write;
1009 aio_req->should_dirty = should_dirty;
1010 INIT_LIST_HEAD(&aio_req->osd_reqs);
1011 if (write) {
1012 aio_req->mtime = mtime;
1013 swap(aio_req->prealloc_cf, *pcf);
1014 }
1015 }
1016 /* ignore error */
1017 }
1018
1019 if (write) {
1020 /*
1021 * throw out any page cache pages in this range. this
1022 * may block.
1023 */
1024 truncate_inode_pages_range(inode->i_mapping, pos,
1025 PAGE_ALIGN(pos + len) - 1);
1026
1027 req->r_mtime = mtime;
1028 }
1029
1030 osd_req_op_extent_osd_data_bvecs(req, 0, bvecs, num_pages, len);
1031
1032 if (aio_req) {
1033 aio_req->total_len += len;
1034 aio_req->num_reqs++;
1035 atomic_inc(&aio_req->pending_reqs);
1036
1037 req->r_callback = ceph_aio_complete_req;
1038 req->r_inode = inode;
1039 req->r_priv = aio_req;
1040 list_add_tail(&req->r_private_item, &aio_req->osd_reqs);
1041
1042 pos += len;
1043 continue;
1044 }
1045
1046 ret = ceph_osdc_start_request(req->r_osdc, req, false);
1047 if (!ret)
1048 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
1049
1050 size = i_size_read(inode);
1051 if (!write) {
1052 if (ret == -ENOENT)
1053 ret = 0;
1054 if (ret >= 0 && ret < len && pos + ret < size) {
1055 struct iov_iter i;
1056 int zlen = min_t(size_t, len - ret,
1057 size - pos - ret);
1058
1059 iov_iter_bvec(&i, READ, bvecs, num_pages, len);
1060 iov_iter_advance(&i, ret);
1061 iov_iter_zero(zlen, &i);
1062 ret += zlen;
1063 }
1064 if (ret >= 0)
1065 len = ret;
1066 }
1067
1068 put_bvecs(bvecs, num_pages, should_dirty);
1069 ceph_osdc_put_request(req);
1070 if (ret < 0)
1071 break;
1072
1073 pos += len;
1074 if (!write && pos >= size)
1075 break;
1076
1077 if (write && pos > size) {
1078 if (ceph_inode_set_size(inode, pos))
1079 ceph_check_caps(ceph_inode(inode),
1080 CHECK_CAPS_AUTHONLY,
1081 NULL);
1082 }
1083 }
1084
1085 if (aio_req) {
1086 LIST_HEAD(osd_reqs);
1087
1088 if (aio_req->num_reqs == 0) {
1089 kfree(aio_req);
1090 return ret;
1091 }
1092
1093 ceph_get_cap_refs(ci, write ? CEPH_CAP_FILE_WR :
1094 CEPH_CAP_FILE_RD);
1095
1096 list_splice(&aio_req->osd_reqs, &osd_reqs);
1097 inode_dio_begin(inode);
1098 while (!list_empty(&osd_reqs)) {
1099 req = list_first_entry(&osd_reqs,
1100 struct ceph_osd_request,
1101 r_private_item);
1102 list_del_init(&req->r_private_item);
1103 if (ret >= 0)
1104 ret = ceph_osdc_start_request(req->r_osdc,
1105 req, false);
1106 if (ret < 0) {
1107 req->r_result = ret;
1108 ceph_aio_complete_req(req);
1109 }
1110 }
1111 return -EIOCBQUEUED;
1112 }
1113
1114 if (ret != -EOLDSNAPC && pos > iocb->ki_pos) {
1115 ret = pos - iocb->ki_pos;
1116 iocb->ki_pos = pos;
1117 }
1118 return ret;
1119 }
1120
1121 /*
1122 * Synchronous write, straight from __user pointer or user pages.
1123 *
1124 * If write spans object boundary, just do multiple writes. (For a
1125 * correct atomic write, we should e.g. take write locks on all
1126 * objects, rollback on failure, etc.)
1127 */
1128 static ssize_t
1129 ceph_sync_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos,
1130 struct ceph_snap_context *snapc)
1131 {
1132 struct file *file = iocb->ki_filp;
1133 struct inode *inode = file_inode(file);
1134 struct ceph_inode_info *ci = ceph_inode(inode);
1135 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1136 struct ceph_vino vino;
1137 struct ceph_osd_request *req;
1138 struct page **pages;
1139 u64 len;
1140 int num_pages;
1141 int written = 0;
1142 int flags;
1143 int ret;
1144 bool check_caps = false;
1145 struct timespec64 mtime = current_time(inode);
1146 size_t count = iov_iter_count(from);
1147
1148 if (ceph_snap(file_inode(file)) != CEPH_NOSNAP)
1149 return -EROFS;
1150
1151 dout("sync_write on file %p %lld~%u snapc %p seq %lld\n",
1152 file, pos, (unsigned)count, snapc, snapc->seq);
1153
1154 ret = filemap_write_and_wait_range(inode->i_mapping,
1155 pos, pos + count - 1);
1156 if (ret < 0)
1157 return ret;
1158
1159 ret = invalidate_inode_pages2_range(inode->i_mapping,
1160 pos >> PAGE_SHIFT,
1161 (pos + count - 1) >> PAGE_SHIFT);
1162 if (ret < 0)
1163 dout("invalidate_inode_pages2_range returned %d\n", ret);
1164
1165 flags = /* CEPH_OSD_FLAG_ORDERSNAP | */ CEPH_OSD_FLAG_WRITE;
1166
1167 while ((len = iov_iter_count(from)) > 0) {
1168 size_t left;
1169 int n;
1170
1171 vino = ceph_vino(inode);
1172 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1173 vino, pos, &len, 0, 1,
1174 CEPH_OSD_OP_WRITE, flags, snapc,
1175 ci->i_truncate_seq,
1176 ci->i_truncate_size,
1177 false);
1178 if (IS_ERR(req)) {
1179 ret = PTR_ERR(req);
1180 break;
1181 }
1182
1183 /*
1184 * write from beginning of first page,
1185 * regardless of io alignment
1186 */
1187 num_pages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
1188
1189 pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL);
1190 if (IS_ERR(pages)) {
1191 ret = PTR_ERR(pages);
1192 goto out;
1193 }
1194
1195 left = len;
1196 for (n = 0; n < num_pages; n++) {
1197 size_t plen = min_t(size_t, left, PAGE_SIZE);
1198 ret = copy_page_from_iter(pages[n], 0, plen, from);
1199 if (ret != plen) {
1200 ret = -EFAULT;
1201 break;
1202 }
1203 left -= ret;
1204 }
1205
1206 if (ret < 0) {
1207 ceph_release_page_vector(pages, num_pages);
1208 goto out;
1209 }
1210
1211 req->r_inode = inode;
1212
1213 osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0,
1214 false, true);
1215
1216 req->r_mtime = mtime;
1217 ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
1218 if (!ret)
1219 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
1220
1221 out:
1222 ceph_osdc_put_request(req);
1223 if (ret != 0) {
1224 ceph_set_error_write(ci);
1225 break;
1226 }
1227
1228 ceph_clear_error_write(ci);
1229 pos += len;
1230 written += len;
1231 if (pos > i_size_read(inode)) {
1232 check_caps = ceph_inode_set_size(inode, pos);
1233 if (check_caps)
1234 ceph_check_caps(ceph_inode(inode),
1235 CHECK_CAPS_AUTHONLY,
1236 NULL);
1237 }
1238
1239 }
1240
1241 if (ret != -EOLDSNAPC && written > 0) {
1242 ret = written;
1243 iocb->ki_pos = pos;
1244 }
1245 return ret;
1246 }
1247
1248 /*
1249 * Wrap generic_file_aio_read with checks for cap bits on the inode.
1250 * Atomically grab references, so that those bits are not released
1251 * back to the MDS mid-read.
1252 *
1253 * Hmm, the sync read case isn't actually async... should it be?
1254 */
1255 static ssize_t ceph_read_iter(struct kiocb *iocb, struct iov_iter *to)
1256 {
1257 struct file *filp = iocb->ki_filp;
1258 struct ceph_file_info *fi = filp->private_data;
1259 size_t len = iov_iter_count(to);
1260 struct inode *inode = file_inode(filp);
1261 struct ceph_inode_info *ci = ceph_inode(inode);
1262 struct page *pinned_page = NULL;
1263 ssize_t ret;
1264 int want, got = 0;
1265 int retry_op = 0, read = 0;
1266
1267 again:
1268 dout("aio_read %p %llx.%llx %llu~%u trying to get caps on %p\n",
1269 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len, inode);
1270
1271 if (iocb->ki_flags & IOCB_DIRECT)
1272 ceph_start_io_direct(inode);
1273 else
1274 ceph_start_io_read(inode);
1275
1276 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1277 want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
1278 else
1279 want = CEPH_CAP_FILE_CACHE;
1280 ret = ceph_get_caps(filp, CEPH_CAP_FILE_RD, want, -1,
1281 &got, &pinned_page);
1282 if (ret < 0) {
1283 if (iocb->ki_flags & IOCB_DIRECT)
1284 ceph_end_io_direct(inode);
1285 else
1286 ceph_end_io_read(inode);
1287 return ret;
1288 }
1289
1290 if ((got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0 ||
1291 (iocb->ki_flags & IOCB_DIRECT) ||
1292 (fi->flags & CEPH_F_SYNC)) {
1293
1294 dout("aio_sync_read %p %llx.%llx %llu~%u got cap refs on %s\n",
1295 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
1296 ceph_cap_string(got));
1297
1298 if (ci->i_inline_version == CEPH_INLINE_NONE) {
1299 if (!retry_op && (iocb->ki_flags & IOCB_DIRECT)) {
1300 ret = ceph_direct_read_write(iocb, to,
1301 NULL, NULL);
1302 if (ret >= 0 && ret < len)
1303 retry_op = CHECK_EOF;
1304 } else {
1305 ret = ceph_sync_read(iocb, to, &retry_op);
1306 }
1307 } else {
1308 retry_op = READ_INLINE;
1309 }
1310 } else {
1311 CEPH_DEFINE_RW_CONTEXT(rw_ctx, got);
1312 dout("aio_read %p %llx.%llx %llu~%u got cap refs on %s\n",
1313 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
1314 ceph_cap_string(got));
1315 ceph_add_rw_context(fi, &rw_ctx);
1316 ret = generic_file_read_iter(iocb, to);
1317 ceph_del_rw_context(fi, &rw_ctx);
1318 }
1319
1320 dout("aio_read %p %llx.%llx dropping cap refs on %s = %d\n",
1321 inode, ceph_vinop(inode), ceph_cap_string(got), (int)ret);
1322 if (pinned_page) {
1323 put_page(pinned_page);
1324 pinned_page = NULL;
1325 }
1326 ceph_put_cap_refs(ci, got);
1327
1328 if (iocb->ki_flags & IOCB_DIRECT)
1329 ceph_end_io_direct(inode);
1330 else
1331 ceph_end_io_read(inode);
1332
1333 if (retry_op > HAVE_RETRIED && ret >= 0) {
1334 int statret;
1335 struct page *page = NULL;
1336 loff_t i_size;
1337 if (retry_op == READ_INLINE) {
1338 page = __page_cache_alloc(GFP_KERNEL);
1339 if (!page)
1340 return -ENOMEM;
1341 }
1342
1343 statret = __ceph_do_getattr(inode, page,
1344 CEPH_STAT_CAP_INLINE_DATA, !!page);
1345 if (statret < 0) {
1346 if (page)
1347 __free_page(page);
1348 if (statret == -ENODATA) {
1349 BUG_ON(retry_op != READ_INLINE);
1350 goto again;
1351 }
1352 return statret;
1353 }
1354
1355 i_size = i_size_read(inode);
1356 if (retry_op == READ_INLINE) {
1357 BUG_ON(ret > 0 || read > 0);
1358 if (iocb->ki_pos < i_size &&
1359 iocb->ki_pos < PAGE_SIZE) {
1360 loff_t end = min_t(loff_t, i_size,
1361 iocb->ki_pos + len);
1362 end = min_t(loff_t, end, PAGE_SIZE);
1363 if (statret < end)
1364 zero_user_segment(page, statret, end);
1365 ret = copy_page_to_iter(page,
1366 iocb->ki_pos & ~PAGE_MASK,
1367 end - iocb->ki_pos, to);
1368 iocb->ki_pos += ret;
1369 read += ret;
1370 }
1371 if (iocb->ki_pos < i_size && read < len) {
1372 size_t zlen = min_t(size_t, len - read,
1373 i_size - iocb->ki_pos);
1374 ret = iov_iter_zero(zlen, to);
1375 iocb->ki_pos += ret;
1376 read += ret;
1377 }
1378 __free_pages(page, 0);
1379 return read;
1380 }
1381
1382 /* hit EOF or hole? */
1383 if (retry_op == CHECK_EOF && iocb->ki_pos < i_size &&
1384 ret < len) {
1385 dout("sync_read hit hole, ppos %lld < size %lld"
1386 ", reading more\n", iocb->ki_pos, i_size);
1387
1388 read += ret;
1389 len -= ret;
1390 retry_op = HAVE_RETRIED;
1391 goto again;
1392 }
1393 }
1394
1395 if (ret >= 0)
1396 ret += read;
1397
1398 return ret;
1399 }
1400
1401 /*
1402 * Take cap references to avoid releasing caps to MDS mid-write.
1403 *
1404 * If we are synchronous, and write with an old snap context, the OSD
1405 * may return EOLDSNAPC. In that case, retry the write.. _after_
1406 * dropping our cap refs and allowing the pending snap to logically
1407 * complete _before_ this write occurs.
1408 *
1409 * If we are near ENOSPC, write synchronously.
1410 */
1411 static ssize_t ceph_write_iter(struct kiocb *iocb, struct iov_iter *from)
1412 {
1413 struct file *file = iocb->ki_filp;
1414 struct ceph_file_info *fi = file->private_data;
1415 struct inode *inode = file_inode(file);
1416 struct ceph_inode_info *ci = ceph_inode(inode);
1417 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1418 struct ceph_osd_client *osdc = &fsc->client->osdc;
1419 struct ceph_cap_flush *prealloc_cf;
1420 ssize_t count, written = 0;
1421 int err, want, got;
1422 bool direct_lock = false;
1423 u32 map_flags;
1424 u64 pool_flags;
1425 loff_t pos;
1426 loff_t limit = max(i_size_read(inode), fsc->max_file_size);
1427
1428 if (ceph_snap(inode) != CEPH_NOSNAP)
1429 return -EROFS;
1430
1431 prealloc_cf = ceph_alloc_cap_flush();
1432 if (!prealloc_cf)
1433 return -ENOMEM;
1434
1435 if ((iocb->ki_flags & (IOCB_DIRECT | IOCB_APPEND)) == IOCB_DIRECT)
1436 direct_lock = true;
1437
1438 retry_snap:
1439 if (direct_lock)
1440 ceph_start_io_direct(inode);
1441 else
1442 ceph_start_io_write(inode);
1443
1444 /* We can write back this queue in page reclaim */
1445 current->backing_dev_info = inode_to_bdi(inode);
1446
1447 if (iocb->ki_flags & IOCB_APPEND) {
1448 err = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false);
1449 if (err < 0)
1450 goto out;
1451 }
1452
1453 err = generic_write_checks(iocb, from);
1454 if (err <= 0)
1455 goto out;
1456
1457 pos = iocb->ki_pos;
1458 if (unlikely(pos >= limit)) {
1459 err = -EFBIG;
1460 goto out;
1461 } else {
1462 iov_iter_truncate(from, limit - pos);
1463 }
1464
1465 count = iov_iter_count(from);
1466 if (ceph_quota_is_max_bytes_exceeded(inode, pos + count)) {
1467 err = -EDQUOT;
1468 goto out;
1469 }
1470
1471 err = file_remove_privs(file);
1472 if (err)
1473 goto out;
1474
1475 err = file_update_time(file);
1476 if (err)
1477 goto out;
1478
1479 inode_inc_iversion_raw(inode);
1480
1481 if (ci->i_inline_version != CEPH_INLINE_NONE) {
1482 err = ceph_uninline_data(file, NULL);
1483 if (err < 0)
1484 goto out;
1485 }
1486
1487 down_read(&osdc->lock);
1488 map_flags = osdc->osdmap->flags;
1489 pool_flags = ceph_pg_pool_flags(osdc->osdmap, ci->i_layout.pool_id);
1490 up_read(&osdc->lock);
1491 if ((map_flags & CEPH_OSDMAP_FULL) ||
1492 (pool_flags & CEPH_POOL_FLAG_FULL)) {
1493 err = -ENOSPC;
1494 goto out;
1495 }
1496
1497 dout("aio_write %p %llx.%llx %llu~%zd getting caps. i_size %llu\n",
1498 inode, ceph_vinop(inode), pos, count, i_size_read(inode));
1499 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1500 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
1501 else
1502 want = CEPH_CAP_FILE_BUFFER;
1503 got = 0;
1504 err = ceph_get_caps(file, CEPH_CAP_FILE_WR, want, pos + count,
1505 &got, NULL);
1506 if (err < 0)
1507 goto out;
1508
1509 dout("aio_write %p %llx.%llx %llu~%zd got cap refs on %s\n",
1510 inode, ceph_vinop(inode), pos, count, ceph_cap_string(got));
1511
1512 if ((got & (CEPH_CAP_FILE_BUFFER|CEPH_CAP_FILE_LAZYIO)) == 0 ||
1513 (iocb->ki_flags & IOCB_DIRECT) || (fi->flags & CEPH_F_SYNC) ||
1514 (ci->i_ceph_flags & CEPH_I_ERROR_WRITE)) {
1515 struct ceph_snap_context *snapc;
1516 struct iov_iter data;
1517
1518 spin_lock(&ci->i_ceph_lock);
1519 if (__ceph_have_pending_cap_snap(ci)) {
1520 struct ceph_cap_snap *capsnap =
1521 list_last_entry(&ci->i_cap_snaps,
1522 struct ceph_cap_snap,
1523 ci_item);
1524 snapc = ceph_get_snap_context(capsnap->context);
1525 } else {
1526 BUG_ON(!ci->i_head_snapc);
1527 snapc = ceph_get_snap_context(ci->i_head_snapc);
1528 }
1529 spin_unlock(&ci->i_ceph_lock);
1530
1531 /* we might need to revert back to that point */
1532 data = *from;
1533 if (iocb->ki_flags & IOCB_DIRECT)
1534 written = ceph_direct_read_write(iocb, &data, snapc,
1535 &prealloc_cf);
1536 else
1537 written = ceph_sync_write(iocb, &data, pos, snapc);
1538 if (direct_lock)
1539 ceph_end_io_direct(inode);
1540 else
1541 ceph_end_io_write(inode);
1542 if (written > 0)
1543 iov_iter_advance(from, written);
1544 ceph_put_snap_context(snapc);
1545 } else {
1546 /*
1547 * No need to acquire the i_truncate_mutex. Because
1548 * the MDS revokes Fwb caps before sending truncate
1549 * message to us. We can't get Fwb cap while there
1550 * are pending vmtruncate. So write and vmtruncate
1551 * can not run at the same time
1552 */
1553 written = generic_perform_write(file, from, pos);
1554 if (likely(written >= 0))
1555 iocb->ki_pos = pos + written;
1556 ceph_end_io_write(inode);
1557 }
1558
1559 if (written >= 0) {
1560 int dirty;
1561
1562 spin_lock(&ci->i_ceph_lock);
1563 ci->i_inline_version = CEPH_INLINE_NONE;
1564 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
1565 &prealloc_cf);
1566 spin_unlock(&ci->i_ceph_lock);
1567 if (dirty)
1568 __mark_inode_dirty(inode, dirty);
1569 if (ceph_quota_is_max_bytes_approaching(inode, iocb->ki_pos))
1570 ceph_check_caps(ci, CHECK_CAPS_NODELAY, NULL);
1571 }
1572
1573 dout("aio_write %p %llx.%llx %llu~%u dropping cap refs on %s\n",
1574 inode, ceph_vinop(inode), pos, (unsigned)count,
1575 ceph_cap_string(got));
1576 ceph_put_cap_refs(ci, got);
1577
1578 if (written == -EOLDSNAPC) {
1579 dout("aio_write %p %llx.%llx %llu~%u" "got EOLDSNAPC, retrying\n",
1580 inode, ceph_vinop(inode), pos, (unsigned)count);
1581 goto retry_snap;
1582 }
1583
1584 if (written >= 0) {
1585 if ((map_flags & CEPH_OSDMAP_NEARFULL) ||
1586 (pool_flags & CEPH_POOL_FLAG_NEARFULL))
1587 iocb->ki_flags |= IOCB_DSYNC;
1588 written = generic_write_sync(iocb, written);
1589 }
1590
1591 goto out_unlocked;
1592 out:
1593 if (direct_lock)
1594 ceph_end_io_direct(inode);
1595 else
1596 ceph_end_io_write(inode);
1597 out_unlocked:
1598 ceph_free_cap_flush(prealloc_cf);
1599 current->backing_dev_info = NULL;
1600 return written ? written : err;
1601 }
1602
1603 /*
1604 * llseek. be sure to verify file size on SEEK_END.
1605 */
1606 static loff_t ceph_llseek(struct file *file, loff_t offset, int whence)
1607 {
1608 struct inode *inode = file->f_mapping->host;
1609 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1610 loff_t i_size;
1611 loff_t ret;
1612
1613 inode_lock(inode);
1614
1615 if (whence == SEEK_END || whence == SEEK_DATA || whence == SEEK_HOLE) {
1616 ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false);
1617 if (ret < 0)
1618 goto out;
1619 }
1620
1621 i_size = i_size_read(inode);
1622 switch (whence) {
1623 case SEEK_END:
1624 offset += i_size;
1625 break;
1626 case SEEK_CUR:
1627 /*
1628 * Here we special-case the lseek(fd, 0, SEEK_CUR)
1629 * position-querying operation. Avoid rewriting the "same"
1630 * f_pos value back to the file because a concurrent read(),
1631 * write() or lseek() might have altered it
1632 */
1633 if (offset == 0) {
1634 ret = file->f_pos;
1635 goto out;
1636 }
1637 offset += file->f_pos;
1638 break;
1639 case SEEK_DATA:
1640 if (offset < 0 || offset >= i_size) {
1641 ret = -ENXIO;
1642 goto out;
1643 }
1644 break;
1645 case SEEK_HOLE:
1646 if (offset < 0 || offset >= i_size) {
1647 ret = -ENXIO;
1648 goto out;
1649 }
1650 offset = i_size;
1651 break;
1652 }
1653
1654 ret = vfs_setpos(file, offset, max(i_size, fsc->max_file_size));
1655
1656 out:
1657 inode_unlock(inode);
1658 return ret;
1659 }
1660
1661 static inline void ceph_zero_partial_page(
1662 struct inode *inode, loff_t offset, unsigned size)
1663 {
1664 struct page *page;
1665 pgoff_t index = offset >> PAGE_SHIFT;
1666
1667 page = find_lock_page(inode->i_mapping, index);
1668 if (page) {
1669 wait_on_page_writeback(page);
1670 zero_user(page, offset & (PAGE_SIZE - 1), size);
1671 unlock_page(page);
1672 put_page(page);
1673 }
1674 }
1675
1676 static void ceph_zero_pagecache_range(struct inode *inode, loff_t offset,
1677 loff_t length)
1678 {
1679 loff_t nearly = round_up(offset, PAGE_SIZE);
1680 if (offset < nearly) {
1681 loff_t size = nearly - offset;
1682 if (length < size)
1683 size = length;
1684 ceph_zero_partial_page(inode, offset, size);
1685 offset += size;
1686 length -= size;
1687 }
1688 if (length >= PAGE_SIZE) {
1689 loff_t size = round_down(length, PAGE_SIZE);
1690 truncate_pagecache_range(inode, offset, offset + size - 1);
1691 offset += size;
1692 length -= size;
1693 }
1694 if (length)
1695 ceph_zero_partial_page(inode, offset, length);
1696 }
1697
1698 static int ceph_zero_partial_object(struct inode *inode,
1699 loff_t offset, loff_t *length)
1700 {
1701 struct ceph_inode_info *ci = ceph_inode(inode);
1702 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1703 struct ceph_osd_request *req;
1704 int ret = 0;
1705 loff_t zero = 0;
1706 int op;
1707
1708 if (!length) {
1709 op = offset ? CEPH_OSD_OP_DELETE : CEPH_OSD_OP_TRUNCATE;
1710 length = &zero;
1711 } else {
1712 op = CEPH_OSD_OP_ZERO;
1713 }
1714
1715 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1716 ceph_vino(inode),
1717 offset, length,
1718 0, 1, op,
1719 CEPH_OSD_FLAG_WRITE,
1720 NULL, 0, 0, false);
1721 if (IS_ERR(req)) {
1722 ret = PTR_ERR(req);
1723 goto out;
1724 }
1725
1726 req->r_mtime = inode->i_mtime;
1727 ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
1728 if (!ret) {
1729 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
1730 if (ret == -ENOENT)
1731 ret = 0;
1732 }
1733 ceph_osdc_put_request(req);
1734
1735 out:
1736 return ret;
1737 }
1738
1739 static int ceph_zero_objects(struct inode *inode, loff_t offset, loff_t length)
1740 {
1741 int ret = 0;
1742 struct ceph_inode_info *ci = ceph_inode(inode);
1743 s32 stripe_unit = ci->i_layout.stripe_unit;
1744 s32 stripe_count = ci->i_layout.stripe_count;
1745 s32 object_size = ci->i_layout.object_size;
1746 u64 object_set_size = object_size * stripe_count;
1747 u64 nearly, t;
1748
1749 /* round offset up to next period boundary */
1750 nearly = offset + object_set_size - 1;
1751 t = nearly;
1752 nearly -= do_div(t, object_set_size);
1753
1754 while (length && offset < nearly) {
1755 loff_t size = length;
1756 ret = ceph_zero_partial_object(inode, offset, &size);
1757 if (ret < 0)
1758 return ret;
1759 offset += size;
1760 length -= size;
1761 }
1762 while (length >= object_set_size) {
1763 int i;
1764 loff_t pos = offset;
1765 for (i = 0; i < stripe_count; ++i) {
1766 ret = ceph_zero_partial_object(inode, pos, NULL);
1767 if (ret < 0)
1768 return ret;
1769 pos += stripe_unit;
1770 }
1771 offset += object_set_size;
1772 length -= object_set_size;
1773 }
1774 while (length) {
1775 loff_t size = length;
1776 ret = ceph_zero_partial_object(inode, offset, &size);
1777 if (ret < 0)
1778 return ret;
1779 offset += size;
1780 length -= size;
1781 }
1782 return ret;
1783 }
1784
1785 static long ceph_fallocate(struct file *file, int mode,
1786 loff_t offset, loff_t length)
1787 {
1788 struct ceph_file_info *fi = file->private_data;
1789 struct inode *inode = file_inode(file);
1790 struct ceph_inode_info *ci = ceph_inode(inode);
1791 struct ceph_cap_flush *prealloc_cf;
1792 int want, got = 0;
1793 int dirty;
1794 int ret = 0;
1795 loff_t endoff = 0;
1796 loff_t size;
1797
1798 if (mode != (FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
1799 return -EOPNOTSUPP;
1800
1801 if (!S_ISREG(inode->i_mode))
1802 return -EOPNOTSUPP;
1803
1804 prealloc_cf = ceph_alloc_cap_flush();
1805 if (!prealloc_cf)
1806 return -ENOMEM;
1807
1808 inode_lock(inode);
1809
1810 if (ceph_snap(inode) != CEPH_NOSNAP) {
1811 ret = -EROFS;
1812 goto unlock;
1813 }
1814
1815 if (ci->i_inline_version != CEPH_INLINE_NONE) {
1816 ret = ceph_uninline_data(file, NULL);
1817 if (ret < 0)
1818 goto unlock;
1819 }
1820
1821 size = i_size_read(inode);
1822
1823 /* Are we punching a hole beyond EOF? */
1824 if (offset >= size)
1825 goto unlock;
1826 if ((offset + length) > size)
1827 length = size - offset;
1828
1829 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1830 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
1831 else
1832 want = CEPH_CAP_FILE_BUFFER;
1833
1834 ret = ceph_get_caps(file, CEPH_CAP_FILE_WR, want, endoff, &got, NULL);
1835 if (ret < 0)
1836 goto unlock;
1837
1838 ceph_zero_pagecache_range(inode, offset, length);
1839 ret = ceph_zero_objects(inode, offset, length);
1840
1841 if (!ret) {
1842 spin_lock(&ci->i_ceph_lock);
1843 ci->i_inline_version = CEPH_INLINE_NONE;
1844 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
1845 &prealloc_cf);
1846 spin_unlock(&ci->i_ceph_lock);
1847 if (dirty)
1848 __mark_inode_dirty(inode, dirty);
1849 }
1850
1851 ceph_put_cap_refs(ci, got);
1852 unlock:
1853 inode_unlock(inode);
1854 ceph_free_cap_flush(prealloc_cf);
1855 return ret;
1856 }
1857
1858 /*
1859 * This function tries to get FILE_WR capabilities for dst_ci and FILE_RD for
1860 * src_ci. Two attempts are made to obtain both caps, and an error is return if
1861 * this fails; zero is returned on success.
1862 */
1863 static int get_rd_wr_caps(struct file *src_filp, int *src_got,
1864 struct file *dst_filp,
1865 loff_t dst_endoff, int *dst_got)
1866 {
1867 int ret = 0;
1868 bool retrying = false;
1869
1870 retry_caps:
1871 ret = ceph_get_caps(dst_filp, CEPH_CAP_FILE_WR, CEPH_CAP_FILE_BUFFER,
1872 dst_endoff, dst_got, NULL);
1873 if (ret < 0)
1874 return ret;
1875
1876 /*
1877 * Since we're already holding the FILE_WR capability for the dst file,
1878 * we would risk a deadlock by using ceph_get_caps. Thus, we'll do some
1879 * retry dance instead to try to get both capabilities.
1880 */
1881 ret = ceph_try_get_caps(file_inode(src_filp),
1882 CEPH_CAP_FILE_RD, CEPH_CAP_FILE_SHARED,
1883 false, src_got);
1884 if (ret <= 0) {
1885 /* Start by dropping dst_ci caps and getting src_ci caps */
1886 ceph_put_cap_refs(ceph_inode(file_inode(dst_filp)), *dst_got);
1887 if (retrying) {
1888 if (!ret)
1889 /* ceph_try_get_caps masks EAGAIN */
1890 ret = -EAGAIN;
1891 return ret;
1892 }
1893 ret = ceph_get_caps(src_filp, CEPH_CAP_FILE_RD,
1894 CEPH_CAP_FILE_SHARED, -1, src_got, NULL);
1895 if (ret < 0)
1896 return ret;
1897 /*... drop src_ci caps too, and retry */
1898 ceph_put_cap_refs(ceph_inode(file_inode(src_filp)), *src_got);
1899 retrying = true;
1900 goto retry_caps;
1901 }
1902 return ret;
1903 }
1904
1905 static void put_rd_wr_caps(struct ceph_inode_info *src_ci, int src_got,
1906 struct ceph_inode_info *dst_ci, int dst_got)
1907 {
1908 ceph_put_cap_refs(src_ci, src_got);
1909 ceph_put_cap_refs(dst_ci, dst_got);
1910 }
1911
1912 /*
1913 * This function does several size-related checks, returning an error if:
1914 * - source file is smaller than off+len
1915 * - destination file size is not OK (inode_newsize_ok())
1916 * - max bytes quotas is exceeded
1917 */
1918 static int is_file_size_ok(struct inode *src_inode, struct inode *dst_inode,
1919 loff_t src_off, loff_t dst_off, size_t len)
1920 {
1921 loff_t size, endoff;
1922
1923 size = i_size_read(src_inode);
1924 /*
1925 * Don't copy beyond source file EOF. Instead of simply setting length
1926 * to (size - src_off), just drop to VFS default implementation, as the
1927 * local i_size may be stale due to other clients writing to the source
1928 * inode.
1929 */
1930 if (src_off + len > size) {
1931 dout("Copy beyond EOF (%llu + %zu > %llu)\n",
1932 src_off, len, size);
1933 return -EOPNOTSUPP;
1934 }
1935 size = i_size_read(dst_inode);
1936
1937 endoff = dst_off + len;
1938 if (inode_newsize_ok(dst_inode, endoff))
1939 return -EOPNOTSUPP;
1940
1941 if (ceph_quota_is_max_bytes_exceeded(dst_inode, endoff))
1942 return -EDQUOT;
1943
1944 return 0;
1945 }
1946
1947 static ssize_t __ceph_copy_file_range(struct file *src_file, loff_t src_off,
1948 struct file *dst_file, loff_t dst_off,
1949 size_t len, unsigned int flags)
1950 {
1951 struct inode *src_inode = file_inode(src_file);
1952 struct inode *dst_inode = file_inode(dst_file);
1953 struct ceph_inode_info *src_ci = ceph_inode(src_inode);
1954 struct ceph_inode_info *dst_ci = ceph_inode(dst_inode);
1955 struct ceph_cap_flush *prealloc_cf;
1956 struct ceph_fs_client *src_fsc = ceph_inode_to_client(src_inode);
1957 struct ceph_object_locator src_oloc, dst_oloc;
1958 struct ceph_object_id src_oid, dst_oid;
1959 loff_t endoff = 0, size;
1960 ssize_t ret = -EIO;
1961 u64 src_objnum, dst_objnum, src_objoff, dst_objoff;
1962 u32 src_objlen, dst_objlen, object_size;
1963 int src_got = 0, dst_got = 0, err, dirty;
1964 bool do_final_copy = false;
1965
1966 if (src_inode->i_sb != dst_inode->i_sb) {
1967 struct ceph_fs_client *dst_fsc = ceph_inode_to_client(dst_inode);
1968
1969 if (ceph_fsid_compare(&src_fsc->client->fsid,
1970 &dst_fsc->client->fsid)) {
1971 dout("Copying files across clusters: src: %pU dst: %pU\n",
1972 &src_fsc->client->fsid, &dst_fsc->client->fsid);
1973 return -EXDEV;
1974 }
1975 }
1976 if (ceph_snap(dst_inode) != CEPH_NOSNAP)
1977 return -EROFS;
1978
1979 /*
1980 * Some of the checks below will return -EOPNOTSUPP, which will force a
1981 * fallback to the default VFS copy_file_range implementation. This is
1982 * desirable in several cases (for ex, the 'len' is smaller than the
1983 * size of the objects, or in cases where that would be more
1984 * efficient).
1985 */
1986
1987 if (ceph_test_mount_opt(src_fsc, NOCOPYFROM))
1988 return -EOPNOTSUPP;
1989
1990 /*
1991 * Striped file layouts require that we copy partial objects, but the
1992 * OSD copy-from operation only supports full-object copies. Limit
1993 * this to non-striped file layouts for now.
1994 */
1995 if ((src_ci->i_layout.stripe_unit != dst_ci->i_layout.stripe_unit) ||
1996 (src_ci->i_layout.stripe_count != 1) ||
1997 (dst_ci->i_layout.stripe_count != 1) ||
1998 (src_ci->i_layout.object_size != dst_ci->i_layout.object_size)) {
1999 dout("Invalid src/dst files layout\n");
2000 return -EOPNOTSUPP;
2001 }
2002
2003 if (len < src_ci->i_layout.object_size)
2004 return -EOPNOTSUPP; /* no remote copy will be done */
2005
2006 prealloc_cf = ceph_alloc_cap_flush();
2007 if (!prealloc_cf)
2008 return -ENOMEM;
2009
2010 /* Start by sync'ing the source and destination files */
2011 ret = file_write_and_wait_range(src_file, src_off, (src_off + len));
2012 if (ret < 0) {
2013 dout("failed to write src file (%zd)\n", ret);
2014 goto out;
2015 }
2016 ret = file_write_and_wait_range(dst_file, dst_off, (dst_off + len));
2017 if (ret < 0) {
2018 dout("failed to write dst file (%zd)\n", ret);
2019 goto out;
2020 }
2021
2022 /*
2023 * We need FILE_WR caps for dst_ci and FILE_RD for src_ci as other
2024 * clients may have dirty data in their caches. And OSDs know nothing
2025 * about caps, so they can't safely do the remote object copies.
2026 */
2027 err = get_rd_wr_caps(src_file, &src_got,
2028 dst_file, (dst_off + len), &dst_got);
2029 if (err < 0) {
2030 dout("get_rd_wr_caps returned %d\n", err);
2031 ret = -EOPNOTSUPP;
2032 goto out;
2033 }
2034
2035 ret = is_file_size_ok(src_inode, dst_inode, src_off, dst_off, len);
2036 if (ret < 0)
2037 goto out_caps;
2038
2039 size = i_size_read(dst_inode);
2040 endoff = dst_off + len;
2041
2042 /* Drop dst file cached pages */
2043 ret = invalidate_inode_pages2_range(dst_inode->i_mapping,
2044 dst_off >> PAGE_SHIFT,
2045 endoff >> PAGE_SHIFT);
2046 if (ret < 0) {
2047 dout("Failed to invalidate inode pages (%zd)\n", ret);
2048 ret = 0; /* XXX */
2049 }
2050 src_oloc.pool = src_ci->i_layout.pool_id;
2051 src_oloc.pool_ns = ceph_try_get_string(src_ci->i_layout.pool_ns);
2052 dst_oloc.pool = dst_ci->i_layout.pool_id;
2053 dst_oloc.pool_ns = ceph_try_get_string(dst_ci->i_layout.pool_ns);
2054
2055 ceph_calc_file_object_mapping(&src_ci->i_layout, src_off,
2056 src_ci->i_layout.object_size,
2057 &src_objnum, &src_objoff, &src_objlen);
2058 ceph_calc_file_object_mapping(&dst_ci->i_layout, dst_off,
2059 dst_ci->i_layout.object_size,
2060 &dst_objnum, &dst_objoff, &dst_objlen);
2061 /* object-level offsets need to the same */
2062 if (src_objoff != dst_objoff) {
2063 ret = -EOPNOTSUPP;
2064 goto out_caps;
2065 }
2066
2067 /*
2068 * Do a manual copy if the object offset isn't object aligned.
2069 * 'src_objlen' contains the bytes left until the end of the object,
2070 * starting at the src_off
2071 */
2072 if (src_objoff) {
2073 /*
2074 * we need to temporarily drop all caps as we'll be calling
2075 * {read,write}_iter, which will get caps again.
2076 */
2077 put_rd_wr_caps(src_ci, src_got, dst_ci, dst_got);
2078 ret = do_splice_direct(src_file, &src_off, dst_file,
2079 &dst_off, src_objlen, flags);
2080 if (ret < 0) {
2081 dout("do_splice_direct returned %d\n", err);
2082 goto out;
2083 }
2084 len -= ret;
2085 err = get_rd_wr_caps(src_file, &src_got,
2086 dst_file, (dst_off + len), &dst_got);
2087 if (err < 0)
2088 goto out;
2089 err = is_file_size_ok(src_inode, dst_inode,
2090 src_off, dst_off, len);
2091 if (err < 0)
2092 goto out_caps;
2093 }
2094 object_size = src_ci->i_layout.object_size;
2095 while (len >= object_size) {
2096 ceph_calc_file_object_mapping(&src_ci->i_layout, src_off,
2097 object_size, &src_objnum,
2098 &src_objoff, &src_objlen);
2099 ceph_calc_file_object_mapping(&dst_ci->i_layout, dst_off,
2100 object_size, &dst_objnum,
2101 &dst_objoff, &dst_objlen);
2102 ceph_oid_init(&src_oid);
2103 ceph_oid_printf(&src_oid, "%llx.%08llx",
2104 src_ci->i_vino.ino, src_objnum);
2105 ceph_oid_init(&dst_oid);
2106 ceph_oid_printf(&dst_oid, "%llx.%08llx",
2107 dst_ci->i_vino.ino, dst_objnum);
2108 /* Do an object remote copy */
2109 err = ceph_osdc_copy_from(
2110 &src_fsc->client->osdc,
2111 src_ci->i_vino.snap, 0,
2112 &src_oid, &src_oloc,
2113 CEPH_OSD_OP_FLAG_FADVISE_SEQUENTIAL |
2114 CEPH_OSD_OP_FLAG_FADVISE_NOCACHE,
2115 &dst_oid, &dst_oloc,
2116 CEPH_OSD_OP_FLAG_FADVISE_SEQUENTIAL |
2117 CEPH_OSD_OP_FLAG_FADVISE_DONTNEED, 0);
2118 if (err) {
2119 dout("ceph_osdc_copy_from returned %d\n", err);
2120 if (!ret)
2121 ret = err;
2122 goto out_caps;
2123 }
2124 len -= object_size;
2125 src_off += object_size;
2126 dst_off += object_size;
2127 ret += object_size;
2128 }
2129
2130 if (len)
2131 /* We still need one final local copy */
2132 do_final_copy = true;
2133
2134 file_update_time(dst_file);
2135 inode_inc_iversion_raw(dst_inode);
2136
2137 if (endoff > size) {
2138 int caps_flags = 0;
2139
2140 /* Let the MDS know about dst file size change */
2141 if (ceph_quota_is_max_bytes_approaching(dst_inode, endoff))
2142 caps_flags |= CHECK_CAPS_NODELAY;
2143 if (ceph_inode_set_size(dst_inode, endoff))
2144 caps_flags |= CHECK_CAPS_AUTHONLY;
2145 if (caps_flags)
2146 ceph_check_caps(dst_ci, caps_flags, NULL);
2147 }
2148 /* Mark Fw dirty */
2149 spin_lock(&dst_ci->i_ceph_lock);
2150 dst_ci->i_inline_version = CEPH_INLINE_NONE;
2151 dirty = __ceph_mark_dirty_caps(dst_ci, CEPH_CAP_FILE_WR, &prealloc_cf);
2152 spin_unlock(&dst_ci->i_ceph_lock);
2153 if (dirty)
2154 __mark_inode_dirty(dst_inode, dirty);
2155
2156 out_caps:
2157 put_rd_wr_caps(src_ci, src_got, dst_ci, dst_got);
2158
2159 if (do_final_copy) {
2160 err = do_splice_direct(src_file, &src_off, dst_file,
2161 &dst_off, len, flags);
2162 if (err < 0) {
2163 dout("do_splice_direct returned %d\n", err);
2164 goto out;
2165 }
2166 len -= err;
2167 ret += err;
2168 }
2169
2170 out:
2171 ceph_free_cap_flush(prealloc_cf);
2172
2173 return ret;
2174 }
2175
2176 static ssize_t ceph_copy_file_range(struct file *src_file, loff_t src_off,
2177 struct file *dst_file, loff_t dst_off,
2178 size_t len, unsigned int flags)
2179 {
2180 ssize_t ret;
2181
2182 ret = __ceph_copy_file_range(src_file, src_off, dst_file, dst_off,
2183 len, flags);
2184
2185 if (ret == -EOPNOTSUPP || ret == -EXDEV)
2186 ret = generic_copy_file_range(src_file, src_off, dst_file,
2187 dst_off, len, flags);
2188 return ret;
2189 }
2190
2191 const struct file_operations ceph_file_fops = {
2192 .open = ceph_open,
2193 .release = ceph_release,
2194 .llseek = ceph_llseek,
2195 .read_iter = ceph_read_iter,
2196 .write_iter = ceph_write_iter,
2197 .mmap = ceph_mmap,
2198 .fsync = ceph_fsync,
2199 .lock = ceph_lock,
2200 .flock = ceph_flock,
2201 .splice_read = generic_file_splice_read,
2202 .splice_write = iter_file_splice_write,
2203 .unlocked_ioctl = ceph_ioctl,
2204 .compat_ioctl = compat_ptr_ioctl,
2205 .fallocate = ceph_fallocate,
2206 .copy_file_range = ceph_copy_file_range,
2207 };
Linux with added FPC-III support