1#include <linux/ceph/ceph_debug.h>
2
3#include <linux/module.h>
4#include <linux/sched.h>
5#include <linux/slab.h>
6#include <linux/file.h>
7#include <linux/mount.h>
8#include <linux/namei.h>
9#include <linux/writeback.h>
10#include <linux/falloc.h>
11
12#include "super.h"
13#include "mds_client.h"
14#include "cache.h"
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41static size_t dio_get_pagev_size(const struct iov_iter *it)
42{
43 const struct iovec *iov = it->iov;
44 const struct iovec *iovend = iov + it->nr_segs;
45 size_t size;
46
47 size = iov->iov_len - it->iov_offset;
48
49
50
51
52 while (PAGE_ALIGNED((iov->iov_base + iov->iov_len)) &&
53 (++iov < iovend && PAGE_ALIGNED((iov->iov_base)))) {
54 size += iov->iov_len;
55 }
56 dout("dio_get_pagevlen len = %zu\n", size);
57 return size;
58}
59
60
61
62
63
64
65static struct page **
66dio_get_pages_alloc(const struct iov_iter *it, size_t nbytes,
67 size_t *page_align, int *num_pages)
68{
69 struct iov_iter tmp_it = *it;
70 size_t align;
71 struct page **pages;
72 int ret = 0, idx, npages;
73
74 align = (unsigned long)(it->iov->iov_base + it->iov_offset) &
75 (PAGE_SIZE - 1);
76 npages = calc_pages_for(align, nbytes);
77 pages = kmalloc(sizeof(*pages) * npages, GFP_KERNEL);
78 if (!pages) {
79 pages = vmalloc(sizeof(*pages) * npages);
80 if (!pages)
81 return ERR_PTR(-ENOMEM);
82 }
83
84 for (idx = 0; idx < npages; ) {
85 size_t start;
86 ret = iov_iter_get_pages(&tmp_it, pages + idx, nbytes,
87 npages - idx, &start);
88 if (ret < 0)
89 goto fail;
90
91 iov_iter_advance(&tmp_it, ret);
92 nbytes -= ret;
93 idx += (ret + start + PAGE_SIZE - 1) / PAGE_SIZE;
94 }
95
96 BUG_ON(nbytes != 0);
97 *num_pages = npages;
98 *page_align = align;
99 dout("dio_get_pages_alloc: got %d pages align %zu\n", npages, align);
100 return pages;
101fail:
102 ceph_put_page_vector(pages, idx, false);
103 return ERR_PTR(ret);
104}
105
106
107
108
109
110static struct ceph_mds_request *
111prepare_open_request(struct super_block *sb, int flags, int create_mode)
112{
113 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
114 struct ceph_mds_client *mdsc = fsc->mdsc;
115 struct ceph_mds_request *req;
116 int want_auth = USE_ANY_MDS;
117 int op = (flags & O_CREAT) ? CEPH_MDS_OP_CREATE : CEPH_MDS_OP_OPEN;
118
119 if (flags & (O_WRONLY|O_RDWR|O_CREAT|O_TRUNC))
120 want_auth = USE_AUTH_MDS;
121
122 req = ceph_mdsc_create_request(mdsc, op, want_auth);
123 if (IS_ERR(req))
124 goto out;
125 req->r_fmode = ceph_flags_to_mode(flags);
126 req->r_args.open.flags = cpu_to_le32(flags);
127 req->r_args.open.mode = cpu_to_le32(create_mode);
128out:
129 return req;
130}
131
132
133
134
135
136static int ceph_init_file(struct inode *inode, struct file *file, int fmode)
137{
138 struct ceph_file_info *cf;
139 int ret = 0;
140
141 switch (inode->i_mode & S_IFMT) {
142 case S_IFREG:
143 ceph_fscache_register_inode_cookie(inode);
144 ceph_fscache_file_set_cookie(inode, file);
145 case S_IFDIR:
146 dout("init_file %p %p 0%o (regular)\n", inode, file,
147 inode->i_mode);
148 cf = kmem_cache_zalloc(ceph_file_cachep, GFP_KERNEL);
149 if (cf == NULL) {
150 ceph_put_fmode(ceph_inode(inode), fmode);
151 return -ENOMEM;
152 }
153 cf->fmode = fmode;
154 cf->next_offset = 2;
155 cf->readdir_cache_idx = -1;
156 file->private_data = cf;
157 BUG_ON(inode->i_fop->release != ceph_release);
158 break;
159
160 case S_IFLNK:
161 dout("init_file %p %p 0%o (symlink)\n", inode, file,
162 inode->i_mode);
163 ceph_put_fmode(ceph_inode(inode), fmode);
164 break;
165
166 default:
167 dout("init_file %p %p 0%o (special)\n", inode, file,
168 inode->i_mode);
169
170
171
172
173 ceph_put_fmode(ceph_inode(inode), fmode);
174 BUG_ON(inode->i_fop->release == ceph_release);
175
176
177 ret = inode->i_fop->open(inode, file);
178 }
179 return ret;
180}
181
182
183
184
185int ceph_renew_caps(struct inode *inode)
186{
187 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
188 struct ceph_inode_info *ci = ceph_inode(inode);
189 struct ceph_mds_request *req;
190 int err, flags, wanted;
191
192 spin_lock(&ci->i_ceph_lock);
193 wanted = __ceph_caps_file_wanted(ci);
194 if (__ceph_is_any_real_caps(ci) &&
195 (!(wanted & CEPH_CAP_ANY_WR) == 0 || ci->i_auth_cap)) {
196 int issued = __ceph_caps_issued(ci, NULL);
197 spin_unlock(&ci->i_ceph_lock);
198 dout("renew caps %p want %s issued %s updating mds_wanted\n",
199 inode, ceph_cap_string(wanted), ceph_cap_string(issued));
200 ceph_check_caps(ci, 0, NULL);
201 return 0;
202 }
203 spin_unlock(&ci->i_ceph_lock);
204
205 flags = 0;
206 if ((wanted & CEPH_CAP_FILE_RD) && (wanted & CEPH_CAP_FILE_WR))
207 flags = O_RDWR;
208 else if (wanted & CEPH_CAP_FILE_RD)
209 flags = O_RDONLY;
210 else if (wanted & CEPH_CAP_FILE_WR)
211 flags = O_WRONLY;
212#ifdef O_LAZY
213 if (wanted & CEPH_CAP_FILE_LAZYIO)
214 flags |= O_LAZY;
215#endif
216
217 req = prepare_open_request(inode->i_sb, flags, 0);
218 if (IS_ERR(req)) {
219 err = PTR_ERR(req);
220 goto out;
221 }
222
223 req->r_inode = inode;
224 ihold(inode);
225 req->r_num_caps = 1;
226 req->r_fmode = -1;
227
228 err = ceph_mdsc_do_request(mdsc, NULL, req);
229 ceph_mdsc_put_request(req);
230out:
231 dout("renew caps %p open result=%d\n", inode, err);
232 return err < 0 ? err : 0;
233}
234
235
236
237
238
239
240
241int ceph_open(struct inode *inode, struct file *file)
242{
243 struct ceph_inode_info *ci = ceph_inode(inode);
244 struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
245 struct ceph_mds_client *mdsc = fsc->mdsc;
246 struct ceph_mds_request *req;
247 struct ceph_file_info *cf = file->private_data;
248 int err;
249 int flags, fmode, wanted;
250
251 if (cf) {
252 dout("open file %p is already opened\n", file);
253 return 0;
254 }
255
256
257 flags = file->f_flags & ~(O_CREAT|O_EXCL);
258 if (S_ISDIR(inode->i_mode))
259 flags = O_DIRECTORY;
260
261 dout("open inode %p ino %llx.%llx file %p flags %d (%d)\n", inode,
262 ceph_vinop(inode), file, flags, file->f_flags);
263 fmode = ceph_flags_to_mode(flags);
264 wanted = ceph_caps_for_mode(fmode);
265
266
267 if (ceph_snap(inode) != CEPH_NOSNAP && (file->f_mode & FMODE_WRITE))
268 return -EROFS;
269
270
271 if (ceph_snap(inode) == CEPH_SNAPDIR) {
272 spin_lock(&ci->i_ceph_lock);
273 __ceph_get_fmode(ci, fmode);
274 spin_unlock(&ci->i_ceph_lock);
275 return ceph_init_file(inode, file, fmode);
276 }
277
278
279
280
281
282
283 spin_lock(&ci->i_ceph_lock);
284 if (__ceph_is_any_real_caps(ci) &&
285 (((fmode & CEPH_FILE_MODE_WR) == 0) || ci->i_auth_cap)) {
286 int mds_wanted = __ceph_caps_mds_wanted(ci);
287 int issued = __ceph_caps_issued(ci, NULL);
288
289 dout("open %p fmode %d want %s issued %s using existing\n",
290 inode, fmode, ceph_cap_string(wanted),
291 ceph_cap_string(issued));
292 __ceph_get_fmode(ci, fmode);
293 spin_unlock(&ci->i_ceph_lock);
294
295
296 if ((issued & wanted) != wanted &&
297 (mds_wanted & wanted) != wanted &&
298 ceph_snap(inode) != CEPH_SNAPDIR)
299 ceph_check_caps(ci, 0, NULL);
300
301 return ceph_init_file(inode, file, fmode);
302 } else if (ceph_snap(inode) != CEPH_NOSNAP &&
303 (ci->i_snap_caps & wanted) == wanted) {
304 __ceph_get_fmode(ci, fmode);
305 spin_unlock(&ci->i_ceph_lock);
306 return ceph_init_file(inode, file, fmode);
307 }
308
309 spin_unlock(&ci->i_ceph_lock);
310
311 dout("open fmode %d wants %s\n", fmode, ceph_cap_string(wanted));
312 req = prepare_open_request(inode->i_sb, flags, 0);
313 if (IS_ERR(req)) {
314 err = PTR_ERR(req);
315 goto out;
316 }
317 req->r_inode = inode;
318 ihold(inode);
319
320 req->r_num_caps = 1;
321 err = ceph_mdsc_do_request(mdsc, NULL, req);
322 if (!err)
323 err = ceph_init_file(inode, file, req->r_fmode);
324 ceph_mdsc_put_request(req);
325 dout("open result=%d on %llx.%llx\n", err, ceph_vinop(inode));
326out:
327 return err;
328}
329
330
331
332
333
334
335int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
336 struct file *file, unsigned flags, umode_t mode,
337 int *opened)
338{
339 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
340 struct ceph_mds_client *mdsc = fsc->mdsc;
341 struct ceph_mds_request *req;
342 struct dentry *dn;
343 struct ceph_acls_info acls = {};
344 int mask;
345 int err;
346
347 dout("atomic_open %p dentry %p '%pd' %s flags %d mode 0%o\n",
348 dir, dentry, dentry,
349 d_unhashed(dentry) ? "unhashed" : "hashed", flags, mode);
350
351 if (dentry->d_name.len > NAME_MAX)
352 return -ENAMETOOLONG;
353
354 err = ceph_init_dentry(dentry);
355 if (err < 0)
356 return err;
357
358 if (flags & O_CREAT) {
359 err = ceph_pre_init_acls(dir, &mode, &acls);
360 if (err < 0)
361 return err;
362 }
363
364
365 req = prepare_open_request(dir->i_sb, flags, mode);
366 if (IS_ERR(req)) {
367 err = PTR_ERR(req);
368 goto out_acl;
369 }
370 req->r_dentry = dget(dentry);
371 req->r_num_caps = 2;
372 if (flags & O_CREAT) {
373 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
374 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
375 if (acls.pagelist) {
376 req->r_pagelist = acls.pagelist;
377 acls.pagelist = NULL;
378 }
379 }
380
381 mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED;
382 if (ceph_security_xattr_wanted(dir))
383 mask |= CEPH_CAP_XATTR_SHARED;
384 req->r_args.open.mask = cpu_to_le32(mask);
385
386 req->r_locked_dir = dir;
387 err = ceph_mdsc_do_request(mdsc,
388 (flags & (O_CREAT|O_TRUNC)) ? dir : NULL,
389 req);
390 err = ceph_handle_snapdir(req, dentry, err);
391 if (err)
392 goto out_req;
393
394 if ((flags & O_CREAT) && !req->r_reply_info.head->is_dentry)
395 err = ceph_handle_notrace_create(dir, dentry);
396
397 if (d_in_lookup(dentry)) {
398 dn = ceph_finish_lookup(req, dentry, err);
399 if (IS_ERR(dn))
400 err = PTR_ERR(dn);
401 } else {
402
403 dn = NULL;
404 }
405 if (err)
406 goto out_req;
407 if (dn || d_really_is_negative(dentry) || d_is_symlink(dentry)) {
408
409 dout("atomic_open finish_no_open on dn %p\n", dn);
410 err = finish_no_open(file, dn);
411 } else {
412 dout("atomic_open finish_open on dn %p\n", dn);
413 if (req->r_op == CEPH_MDS_OP_CREATE && req->r_reply_info.has_create_ino) {
414 ceph_init_inode_acls(d_inode(dentry), &acls);
415 *opened |= FILE_CREATED;
416 }
417 err = finish_open(file, dentry, ceph_open, opened);
418 }
419out_req:
420 if (!req->r_err && req->r_target_inode)
421 ceph_put_fmode(ceph_inode(req->r_target_inode), req->r_fmode);
422 ceph_mdsc_put_request(req);
423out_acl:
424 ceph_release_acls_info(&acls);
425 dout("atomic_open result=%d\n", err);
426 return err;
427}
428
429int ceph_release(struct inode *inode, struct file *file)
430{
431 struct ceph_inode_info *ci = ceph_inode(inode);
432 struct ceph_file_info *cf = file->private_data;
433
434 dout("release inode %p file %p\n", inode, file);
435 ceph_put_fmode(ci, cf->fmode);
436 if (cf->last_readdir)
437 ceph_mdsc_put_request(cf->last_readdir);
438 kfree(cf->last_name);
439 kfree(cf->dir_info);
440 kmem_cache_free(ceph_file_cachep, cf);
441
442
443 wake_up_all(&ci->i_cap_wq);
444 return 0;
445}
446
447enum {
448 HAVE_RETRIED = 1,
449 CHECK_EOF = 2,
450 READ_INLINE = 3,
451};
452
453
454
455
456
457
458
459
460static int striped_read(struct inode *inode,
461 u64 off, u64 len,
462 struct page **pages, int num_pages,
463 int *checkeof)
464{
465 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
466 struct ceph_inode_info *ci = ceph_inode(inode);
467 u64 pos, this_len, left;
468 loff_t i_size;
469 int page_align, pages_left;
470 int read, ret;
471 struct page **page_pos;
472 bool hit_stripe, was_short;
473
474
475
476
477 pos = off;
478 left = len;
479 page_pos = pages;
480 pages_left = num_pages;
481 read = 0;
482
483more:
484 page_align = pos & ~PAGE_MASK;
485 this_len = left;
486 ret = ceph_osdc_readpages(&fsc->client->osdc, ceph_vino(inode),
487 &ci->i_layout, pos, &this_len,
488 ci->i_truncate_seq,
489 ci->i_truncate_size,
490 page_pos, pages_left, page_align);
491 if (ret == -ENOENT)
492 ret = 0;
493 hit_stripe = this_len < left;
494 was_short = ret >= 0 && ret < this_len;
495 dout("striped_read %llu~%llu (read %u) got %d%s%s\n", pos, left, read,
496 ret, hit_stripe ? " HITSTRIPE" : "", was_short ? " SHORT" : "");
497
498 i_size = i_size_read(inode);
499 if (ret >= 0) {
500 int didpages;
501 if (was_short && (pos + ret < i_size)) {
502 int zlen = min(this_len - ret, i_size - pos - ret);
503 int zoff = (off & ~PAGE_MASK) + read + ret;
504 dout(" zero gap %llu to %llu\n",
505 pos + ret, pos + ret + zlen);
506 ceph_zero_page_vector_range(zoff, zlen, pages);
507 ret += zlen;
508 }
509
510 didpages = (page_align + ret) >> PAGE_SHIFT;
511 pos += ret;
512 read = pos - off;
513 left -= ret;
514 page_pos += didpages;
515 pages_left -= didpages;
516
517
518 if (left && hit_stripe && pos < i_size)
519 goto more;
520 }
521
522 if (read > 0) {
523 ret = read;
524
525 if (pos + left > i_size)
526 *checkeof = CHECK_EOF;
527 }
528
529 dout("striped_read returns %d\n", ret);
530 return ret;
531}
532
533
534
535
536
537
538
539static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *i,
540 int *checkeof)
541{
542 struct file *file = iocb->ki_filp;
543 struct inode *inode = file_inode(file);
544 struct page **pages;
545 u64 off = iocb->ki_pos;
546 int num_pages, ret;
547 size_t len = iov_iter_count(i);
548
549 dout("sync_read on file %p %llu~%u %s\n", file, off,
550 (unsigned)len,
551 (file->f_flags & O_DIRECT) ? "O_DIRECT" : "");
552
553 if (!len)
554 return 0;
555
556
557
558
559
560
561 ret = filemap_write_and_wait_range(inode->i_mapping, off,
562 off + len);
563 if (ret < 0)
564 return ret;
565
566 num_pages = calc_pages_for(off, len);
567 pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL);
568 if (IS_ERR(pages))
569 return PTR_ERR(pages);
570 ret = striped_read(inode, off, len, pages,
571 num_pages, checkeof);
572 if (ret > 0) {
573 int l, k = 0;
574 size_t left = ret;
575
576 while (left) {
577 size_t page_off = off & ~PAGE_MASK;
578 size_t copy = min_t(size_t, left,
579 PAGE_SIZE - page_off);
580 l = copy_page_to_iter(pages[k++], page_off, copy, i);
581 off += l;
582 left -= l;
583 if (l < copy)
584 break;
585 }
586 }
587 ceph_release_page_vector(pages, num_pages);
588
589 if (off > iocb->ki_pos) {
590 ret = off - iocb->ki_pos;
591 iocb->ki_pos = off;
592 }
593
594 dout("sync_read result %d\n", ret);
595 return ret;
596}
597
598struct ceph_aio_request {
599 struct kiocb *iocb;
600 size_t total_len;
601 int write;
602 int error;
603 struct list_head osd_reqs;
604 unsigned num_reqs;
605 atomic_t pending_reqs;
606 struct timespec mtime;
607 struct ceph_cap_flush *prealloc_cf;
608};
609
610struct ceph_aio_work {
611 struct work_struct work;
612 struct ceph_osd_request *req;
613};
614
615static void ceph_aio_retry_work(struct work_struct *work);
616
617static void ceph_aio_complete(struct inode *inode,
618 struct ceph_aio_request *aio_req)
619{
620 struct ceph_inode_info *ci = ceph_inode(inode);
621 int ret;
622
623 if (!atomic_dec_and_test(&aio_req->pending_reqs))
624 return;
625
626 ret = aio_req->error;
627 if (!ret)
628 ret = aio_req->total_len;
629
630 dout("ceph_aio_complete %p rc %d\n", inode, ret);
631
632 if (ret >= 0 && aio_req->write) {
633 int dirty;
634
635 loff_t endoff = aio_req->iocb->ki_pos + aio_req->total_len;
636 if (endoff > i_size_read(inode)) {
637 if (ceph_inode_set_size(inode, endoff))
638 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
639 }
640
641 spin_lock(&ci->i_ceph_lock);
642 ci->i_inline_version = CEPH_INLINE_NONE;
643 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
644 &aio_req->prealloc_cf);
645 spin_unlock(&ci->i_ceph_lock);
646 if (dirty)
647 __mark_inode_dirty(inode, dirty);
648
649 }
650
651 ceph_put_cap_refs(ci, (aio_req->write ? CEPH_CAP_FILE_WR :
652 CEPH_CAP_FILE_RD));
653
654 aio_req->iocb->ki_complete(aio_req->iocb, ret, 0);
655
656 ceph_free_cap_flush(aio_req->prealloc_cf);
657 kfree(aio_req);
658}
659
660static void ceph_aio_complete_req(struct ceph_osd_request *req)
661{
662 int rc = req->r_result;
663 struct inode *inode = req->r_inode;
664 struct ceph_aio_request *aio_req = req->r_priv;
665 struct ceph_osd_data *osd_data = osd_req_op_extent_osd_data(req, 0);
666 int num_pages = calc_pages_for((u64)osd_data->alignment,
667 osd_data->length);
668
669 dout("ceph_aio_complete_req %p rc %d bytes %llu\n",
670 inode, rc, osd_data->length);
671
672 if (rc == -EOLDSNAPC) {
673 struct ceph_aio_work *aio_work;
674 BUG_ON(!aio_req->write);
675
676 aio_work = kmalloc(sizeof(*aio_work), GFP_NOFS);
677 if (aio_work) {
678 INIT_WORK(&aio_work->work, ceph_aio_retry_work);
679 aio_work->req = req;
680 queue_work(ceph_inode_to_client(inode)->wb_wq,
681 &aio_work->work);
682 return;
683 }
684 rc = -ENOMEM;
685 } else if (!aio_req->write) {
686 if (rc == -ENOENT)
687 rc = 0;
688 if (rc >= 0 && osd_data->length > rc) {
689 int zoff = osd_data->alignment + rc;
690 int zlen = osd_data->length - rc;
691
692
693
694
695
696 if (aio_req->num_reqs == 1) {
697 loff_t i_size = i_size_read(inode);
698 loff_t endoff = aio_req->iocb->ki_pos + rc;
699 if (endoff < i_size)
700 zlen = min_t(size_t, zlen,
701 i_size - endoff);
702 aio_req->total_len = rc + zlen;
703 }
704
705 if (zlen > 0)
706 ceph_zero_page_vector_range(zoff, zlen,
707 osd_data->pages);
708 }
709 }
710
711 ceph_put_page_vector(osd_data->pages, num_pages, !aio_req->write);
712 ceph_osdc_put_request(req);
713
714 if (rc < 0)
715 cmpxchg(&aio_req->error, 0, rc);
716
717 ceph_aio_complete(inode, aio_req);
718 return;
719}
720
721static void ceph_aio_retry_work(struct work_struct *work)
722{
723 struct ceph_aio_work *aio_work =
724 container_of(work, struct ceph_aio_work, work);
725 struct ceph_osd_request *orig_req = aio_work->req;
726 struct ceph_aio_request *aio_req = orig_req->r_priv;
727 struct inode *inode = orig_req->r_inode;
728 struct ceph_inode_info *ci = ceph_inode(inode);
729 struct ceph_snap_context *snapc;
730 struct ceph_osd_request *req;
731 int ret;
732
733 spin_lock(&ci->i_ceph_lock);
734 if (__ceph_have_pending_cap_snap(ci)) {
735 struct ceph_cap_snap *capsnap =
736 list_last_entry(&ci->i_cap_snaps,
737 struct ceph_cap_snap,
738 ci_item);
739 snapc = ceph_get_snap_context(capsnap->context);
740 } else {
741 BUG_ON(!ci->i_head_snapc);
742 snapc = ceph_get_snap_context(ci->i_head_snapc);
743 }
744 spin_unlock(&ci->i_ceph_lock);
745
746 req = ceph_osdc_alloc_request(orig_req->r_osdc, snapc, 2,
747 false, GFP_NOFS);
748 if (!req) {
749 ret = -ENOMEM;
750 req = orig_req;
751 goto out;
752 }
753
754 req->r_flags = CEPH_OSD_FLAG_ORDERSNAP |
755 CEPH_OSD_FLAG_ONDISK |
756 CEPH_OSD_FLAG_WRITE;
757 ceph_oloc_copy(&req->r_base_oloc, &orig_req->r_base_oloc);
758 ceph_oid_copy(&req->r_base_oid, &orig_req->r_base_oid);
759
760 ret = ceph_osdc_alloc_messages(req, GFP_NOFS);
761 if (ret) {
762 ceph_osdc_put_request(req);
763 req = orig_req;
764 goto out;
765 }
766
767 req->r_ops[0] = orig_req->r_ops[0];
768 osd_req_op_init(req, 1, CEPH_OSD_OP_STARTSYNC, 0);
769
770 req->r_mtime = aio_req->mtime;
771 req->r_data_offset = req->r_ops[0].extent.offset;
772
773 ceph_osdc_put_request(orig_req);
774
775 req->r_callback = ceph_aio_complete_req;
776 req->r_inode = inode;
777 req->r_priv = aio_req;
778
779 ret = ceph_osdc_start_request(req->r_osdc, req, false);
780out:
781 if (ret < 0) {
782 req->r_result = ret;
783 ceph_aio_complete_req(req);
784 }
785
786 ceph_put_snap_context(snapc);
787 kfree(aio_work);
788}
789
790
791
792
793
794
795
796
797
798
799
800
801
802static void ceph_sync_write_unsafe(struct ceph_osd_request *req, bool unsafe)
803{
804 struct ceph_inode_info *ci = ceph_inode(req->r_inode);
805
806 dout("%s %p tid %llu %ssafe\n", __func__, req, req->r_tid,
807 unsafe ? "un" : "");
808 if (unsafe) {
809 ceph_get_cap_refs(ci, CEPH_CAP_FILE_WR);
810 spin_lock(&ci->i_unsafe_lock);
811 list_add_tail(&req->r_unsafe_item,
812 &ci->i_unsafe_writes);
813 spin_unlock(&ci->i_unsafe_lock);
814
815 complete_all(&req->r_completion);
816 } else {
817 spin_lock(&ci->i_unsafe_lock);
818 list_del_init(&req->r_unsafe_item);
819 spin_unlock(&ci->i_unsafe_lock);
820 ceph_put_cap_refs(ci, CEPH_CAP_FILE_WR);
821 }
822}
823
824
825
826
827
828
829
830void ceph_sync_write_wait(struct inode *inode)
831{
832 struct ceph_inode_info *ci = ceph_inode(inode);
833 struct list_head *head = &ci->i_unsafe_writes;
834 struct ceph_osd_request *req;
835 u64 last_tid;
836
837 if (!S_ISREG(inode->i_mode))
838 return;
839
840 spin_lock(&ci->i_unsafe_lock);
841 if (list_empty(head))
842 goto out;
843
844
845
846 req = list_last_entry(head, struct ceph_osd_request,
847 r_unsafe_item);
848 last_tid = req->r_tid;
849
850 do {
851 ceph_osdc_get_request(req);
852 spin_unlock(&ci->i_unsafe_lock);
853
854 dout("sync_write_wait on tid %llu (until %llu)\n",
855 req->r_tid, last_tid);
856 wait_for_completion(&req->r_safe_completion);
857 ceph_osdc_put_request(req);
858
859 spin_lock(&ci->i_unsafe_lock);
860
861
862
863
864 if (list_empty(head))
865 break;
866 req = list_first_entry(head, struct ceph_osd_request,
867 r_unsafe_item);
868 } while (req->r_tid < last_tid);
869out:
870 spin_unlock(&ci->i_unsafe_lock);
871}
872
873static ssize_t
874ceph_direct_read_write(struct kiocb *iocb, struct iov_iter *iter,
875 struct ceph_snap_context *snapc,
876 struct ceph_cap_flush **pcf)
877{
878 struct file *file = iocb->ki_filp;
879 struct inode *inode = file_inode(file);
880 struct ceph_inode_info *ci = ceph_inode(inode);
881 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
882 struct ceph_vino vino;
883 struct ceph_osd_request *req;
884 struct page **pages;
885 struct ceph_aio_request *aio_req = NULL;
886 int num_pages = 0;
887 int flags;
888 int ret;
889 struct timespec mtime = current_time(inode);
890 size_t count = iov_iter_count(iter);
891 loff_t pos = iocb->ki_pos;
892 bool write = iov_iter_rw(iter) == WRITE;
893
894 if (write && ceph_snap(file_inode(file)) != CEPH_NOSNAP)
895 return -EROFS;
896
897 dout("sync_direct_read_write (%s) on file %p %lld~%u\n",
898 (write ? "write" : "read"), file, pos, (unsigned)count);
899
900 ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + count);
901 if (ret < 0)
902 return ret;
903
904 if (write) {
905 int ret2 = invalidate_inode_pages2_range(inode->i_mapping,
906 pos >> PAGE_SHIFT,
907 (pos + count) >> PAGE_SHIFT);
908 if (ret2 < 0)
909 dout("invalidate_inode_pages2_range returned %d\n", ret);
910
911 flags = CEPH_OSD_FLAG_ORDERSNAP |
912 CEPH_OSD_FLAG_ONDISK |
913 CEPH_OSD_FLAG_WRITE;
914 } else {
915 flags = CEPH_OSD_FLAG_READ;
916 }
917
918 while (iov_iter_count(iter) > 0) {
919 u64 size = dio_get_pagev_size(iter);
920 size_t start = 0;
921 ssize_t len;
922
923 vino = ceph_vino(inode);
924 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
925 vino, pos, &size, 0,
926
927 write ? 2 : 1,
928 write ? CEPH_OSD_OP_WRITE :
929 CEPH_OSD_OP_READ,
930 flags, snapc,
931 ci->i_truncate_seq,
932 ci->i_truncate_size,
933 false);
934 if (IS_ERR(req)) {
935 ret = PTR_ERR(req);
936 break;
937 }
938
939 len = size;
940 pages = dio_get_pages_alloc(iter, len, &start, &num_pages);
941 if (IS_ERR(pages)) {
942 ceph_osdc_put_request(req);
943 ret = PTR_ERR(pages);
944 break;
945 }
946
947
948
949
950
951 if (pos == iocb->ki_pos && !is_sync_kiocb(iocb) &&
952 (len == count || pos + count <= i_size_read(inode))) {
953 aio_req = kzalloc(sizeof(*aio_req), GFP_KERNEL);
954 if (aio_req) {
955 aio_req->iocb = iocb;
956 aio_req->write = write;
957 INIT_LIST_HEAD(&aio_req->osd_reqs);
958 if (write) {
959 aio_req->mtime = mtime;
960 swap(aio_req->prealloc_cf, *pcf);
961 }
962 }
963
964 }
965
966 if (write) {
967
968
969
970
971 truncate_inode_pages_range(inode->i_mapping, pos,
972 (pos+len) | (PAGE_SIZE - 1));
973
974 osd_req_op_init(req, 1, CEPH_OSD_OP_STARTSYNC, 0);
975 req->r_mtime = mtime;
976 }
977
978 osd_req_op_extent_osd_data_pages(req, 0, pages, len, start,
979 false, false);
980
981 if (aio_req) {
982 aio_req->total_len += len;
983 aio_req->num_reqs++;
984 atomic_inc(&aio_req->pending_reqs);
985
986 req->r_callback = ceph_aio_complete_req;
987 req->r_inode = inode;
988 req->r_priv = aio_req;
989 list_add_tail(&req->r_unsafe_item, &aio_req->osd_reqs);
990
991 pos += len;
992 iov_iter_advance(iter, len);
993 continue;
994 }
995
996 ret = ceph_osdc_start_request(req->r_osdc, req, false);
997 if (!ret)
998 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
999
1000 size = i_size_read(inode);
1001 if (!write) {
1002 if (ret == -ENOENT)
1003 ret = 0;
1004 if (ret >= 0 && ret < len && pos + ret < size) {
1005 int zlen = min_t(size_t, len - ret,
1006 size - pos - ret);
1007 ceph_zero_page_vector_range(start + ret, zlen,
1008 pages);
1009 ret += zlen;
1010 }
1011 if (ret >= 0)
1012 len = ret;
1013 }
1014
1015 ceph_put_page_vector(pages, num_pages, !write);
1016
1017 ceph_osdc_put_request(req);
1018 if (ret < 0)
1019 break;
1020
1021 pos += len;
1022 iov_iter_advance(iter, len);
1023
1024 if (!write && pos >= size)
1025 break;
1026
1027 if (write && pos > size) {
1028 if (ceph_inode_set_size(inode, pos))
1029 ceph_check_caps(ceph_inode(inode),
1030 CHECK_CAPS_AUTHONLY,
1031 NULL);
1032 }
1033 }
1034
1035 if (aio_req) {
1036 LIST_HEAD(osd_reqs);
1037
1038 if (aio_req->num_reqs == 0) {
1039 kfree(aio_req);
1040 return ret;
1041 }
1042
1043 ceph_get_cap_refs(ci, write ? CEPH_CAP_FILE_WR :
1044 CEPH_CAP_FILE_RD);
1045
1046 list_splice(&aio_req->osd_reqs, &osd_reqs);
1047 while (!list_empty(&osd_reqs)) {
1048 req = list_first_entry(&osd_reqs,
1049 struct ceph_osd_request,
1050 r_unsafe_item);
1051 list_del_init(&req->r_unsafe_item);
1052 if (ret >= 0)
1053 ret = ceph_osdc_start_request(req->r_osdc,
1054 req, false);
1055 if (ret < 0) {
1056 req->r_result = ret;
1057 ceph_aio_complete_req(req);
1058 }
1059 }
1060 return -EIOCBQUEUED;
1061 }
1062
1063 if (ret != -EOLDSNAPC && pos > iocb->ki_pos) {
1064 ret = pos - iocb->ki_pos;
1065 iocb->ki_pos = pos;
1066 }
1067 return ret;
1068}
1069
1070
1071
1072
1073
1074
1075
1076
1077static ssize_t
1078ceph_sync_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos,
1079 struct ceph_snap_context *snapc)
1080{
1081 struct file *file = iocb->ki_filp;
1082 struct inode *inode = file_inode(file);
1083 struct ceph_inode_info *ci = ceph_inode(inode);
1084 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1085 struct ceph_vino vino;
1086 struct ceph_osd_request *req;
1087 struct page **pages;
1088 u64 len;
1089 int num_pages;
1090 int written = 0;
1091 int flags;
1092 int check_caps = 0;
1093 int ret;
1094 struct timespec mtime = current_time(inode);
1095 size_t count = iov_iter_count(from);
1096
1097 if (ceph_snap(file_inode(file)) != CEPH_NOSNAP)
1098 return -EROFS;
1099
1100 dout("sync_write on file %p %lld~%u\n", file, pos, (unsigned)count);
1101
1102 ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + count);
1103 if (ret < 0)
1104 return ret;
1105
1106 ret = invalidate_inode_pages2_range(inode->i_mapping,
1107 pos >> PAGE_SHIFT,
1108 (pos + count) >> PAGE_SHIFT);
1109 if (ret < 0)
1110 dout("invalidate_inode_pages2_range returned %d\n", ret);
1111
1112 flags = CEPH_OSD_FLAG_ORDERSNAP |
1113 CEPH_OSD_FLAG_ONDISK |
1114 CEPH_OSD_FLAG_WRITE |
1115 CEPH_OSD_FLAG_ACK;
1116
1117 while ((len = iov_iter_count(from)) > 0) {
1118 size_t left;
1119 int n;
1120
1121 vino = ceph_vino(inode);
1122 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1123 vino, pos, &len, 0, 1,
1124 CEPH_OSD_OP_WRITE, flags, snapc,
1125 ci->i_truncate_seq,
1126 ci->i_truncate_size,
1127 false);
1128 if (IS_ERR(req)) {
1129 ret = PTR_ERR(req);
1130 break;
1131 }
1132
1133
1134
1135
1136
1137 num_pages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
1138
1139 pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL);
1140 if (IS_ERR(pages)) {
1141 ret = PTR_ERR(pages);
1142 goto out;
1143 }
1144
1145 left = len;
1146 for (n = 0; n < num_pages; n++) {
1147 size_t plen = min_t(size_t, left, PAGE_SIZE);
1148 ret = copy_page_from_iter(pages[n], 0, plen, from);
1149 if (ret != plen) {
1150 ret = -EFAULT;
1151 break;
1152 }
1153 left -= ret;
1154 }
1155
1156 if (ret < 0) {
1157 ceph_release_page_vector(pages, num_pages);
1158 goto out;
1159 }
1160
1161
1162 req->r_unsafe_callback = ceph_sync_write_unsafe;
1163 req->r_inode = inode;
1164
1165 osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0,
1166 false, true);
1167
1168 req->r_mtime = mtime;
1169 ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
1170 if (!ret)
1171 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
1172
1173out:
1174 ceph_osdc_put_request(req);
1175 if (ret == 0) {
1176 pos += len;
1177 written += len;
1178
1179 if (pos > i_size_read(inode)) {
1180 check_caps = ceph_inode_set_size(inode, pos);
1181 if (check_caps)
1182 ceph_check_caps(ceph_inode(inode),
1183 CHECK_CAPS_AUTHONLY,
1184 NULL);
1185 }
1186 } else
1187 break;
1188 }
1189
1190 if (ret != -EOLDSNAPC && written > 0) {
1191 ret = written;
1192 iocb->ki_pos = pos;
1193 }
1194 return ret;
1195}
1196
1197
1198
1199
1200
1201
1202
1203
1204static ssize_t ceph_read_iter(struct kiocb *iocb, struct iov_iter *to)
1205{
1206 struct file *filp = iocb->ki_filp;
1207 struct ceph_file_info *fi = filp->private_data;
1208 size_t len = iov_iter_count(to);
1209 struct inode *inode = file_inode(filp);
1210 struct ceph_inode_info *ci = ceph_inode(inode);
1211 struct page *pinned_page = NULL;
1212 ssize_t ret;
1213 int want, got = 0;
1214 int retry_op = 0, read = 0;
1215
1216again:
1217 dout("aio_read %p %llx.%llx %llu~%u trying to get caps on %p\n",
1218 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len, inode);
1219
1220 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1221 want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
1222 else
1223 want = CEPH_CAP_FILE_CACHE;
1224 ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, -1, &got, &pinned_page);
1225 if (ret < 0)
1226 return ret;
1227
1228 if ((got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0 ||
1229 (iocb->ki_flags & IOCB_DIRECT) ||
1230 (fi->flags & CEPH_F_SYNC)) {
1231
1232 dout("aio_sync_read %p %llx.%llx %llu~%u got cap refs on %s\n",
1233 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
1234 ceph_cap_string(got));
1235
1236 if (ci->i_inline_version == CEPH_INLINE_NONE) {
1237 if (!retry_op && (iocb->ki_flags & IOCB_DIRECT)) {
1238 ret = ceph_direct_read_write(iocb, to,
1239 NULL, NULL);
1240 if (ret >= 0 && ret < len)
1241 retry_op = CHECK_EOF;
1242 } else {
1243 ret = ceph_sync_read(iocb, to, &retry_op);
1244 }
1245 } else {
1246 retry_op = READ_INLINE;
1247 }
1248 } else {
1249 dout("aio_read %p %llx.%llx %llu~%u got cap refs on %s\n",
1250 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
1251 ceph_cap_string(got));
1252
1253 ret = generic_file_read_iter(iocb, to);
1254 }
1255 dout("aio_read %p %llx.%llx dropping cap refs on %s = %d\n",
1256 inode, ceph_vinop(inode), ceph_cap_string(got), (int)ret);
1257 if (pinned_page) {
1258 put_page(pinned_page);
1259 pinned_page = NULL;
1260 }
1261 ceph_put_cap_refs(ci, got);
1262 if (retry_op > HAVE_RETRIED && ret >= 0) {
1263 int statret;
1264 struct page *page = NULL;
1265 loff_t i_size;
1266 if (retry_op == READ_INLINE) {
1267 page = __page_cache_alloc(GFP_KERNEL);
1268 if (!page)
1269 return -ENOMEM;
1270 }
1271
1272 statret = __ceph_do_getattr(inode, page,
1273 CEPH_STAT_CAP_INLINE_DATA, !!page);
1274 if (statret < 0) {
1275 if (page)
1276 __free_page(page);
1277 if (statret == -ENODATA) {
1278 BUG_ON(retry_op != READ_INLINE);
1279 goto again;
1280 }
1281 return statret;
1282 }
1283
1284 i_size = i_size_read(inode);
1285 if (retry_op == READ_INLINE) {
1286 BUG_ON(ret > 0 || read > 0);
1287 if (iocb->ki_pos < i_size &&
1288 iocb->ki_pos < PAGE_SIZE) {
1289 loff_t end = min_t(loff_t, i_size,
1290 iocb->ki_pos + len);
1291 end = min_t(loff_t, end, PAGE_SIZE);
1292 if (statret < end)
1293 zero_user_segment(page, statret, end);
1294 ret = copy_page_to_iter(page,
1295 iocb->ki_pos & ~PAGE_MASK,
1296 end - iocb->ki_pos, to);
1297 iocb->ki_pos += ret;
1298 read += ret;
1299 }
1300 if (iocb->ki_pos < i_size && read < len) {
1301 size_t zlen = min_t(size_t, len - read,
1302 i_size - iocb->ki_pos);
1303 ret = iov_iter_zero(zlen, to);
1304 iocb->ki_pos += ret;
1305 read += ret;
1306 }
1307 __free_pages(page, 0);
1308 return read;
1309 }
1310
1311
1312 if (retry_op == CHECK_EOF && iocb->ki_pos < i_size &&
1313 ret < len) {
1314 dout("sync_read hit hole, ppos %lld < size %lld"
1315 ", reading more\n", iocb->ki_pos, i_size);
1316
1317 read += ret;
1318 len -= ret;
1319 retry_op = HAVE_RETRIED;
1320 goto again;
1321 }
1322 }
1323
1324 if (ret >= 0)
1325 ret += read;
1326
1327 return ret;
1328}
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340static ssize_t ceph_write_iter(struct kiocb *iocb, struct iov_iter *from)
1341{
1342 struct file *file = iocb->ki_filp;
1343 struct ceph_file_info *fi = file->private_data;
1344 struct inode *inode = file_inode(file);
1345 struct ceph_inode_info *ci = ceph_inode(inode);
1346 struct ceph_osd_client *osdc =
1347 &ceph_sb_to_client(inode->i_sb)->client->osdc;
1348 struct ceph_cap_flush *prealloc_cf;
1349 ssize_t count, written = 0;
1350 int err, want, got;
1351 loff_t pos;
1352
1353 if (ceph_snap(inode) != CEPH_NOSNAP)
1354 return -EROFS;
1355
1356 prealloc_cf = ceph_alloc_cap_flush();
1357 if (!prealloc_cf)
1358 return -ENOMEM;
1359
1360 inode_lock(inode);
1361
1362
1363 current->backing_dev_info = inode_to_bdi(inode);
1364
1365 if (iocb->ki_flags & IOCB_APPEND) {
1366 err = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false);
1367 if (err < 0)
1368 goto out;
1369 }
1370
1371 err = generic_write_checks(iocb, from);
1372 if (err <= 0)
1373 goto out;
1374
1375 pos = iocb->ki_pos;
1376 count = iov_iter_count(from);
1377 err = file_remove_privs(file);
1378 if (err)
1379 goto out;
1380
1381 err = file_update_time(file);
1382 if (err)
1383 goto out;
1384
1385 if (ci->i_inline_version != CEPH_INLINE_NONE) {
1386 err = ceph_uninline_data(file, NULL);
1387 if (err < 0)
1388 goto out;
1389 }
1390
1391retry_snap:
1392 if (ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL)) {
1393 err = -ENOSPC;
1394 goto out;
1395 }
1396
1397 dout("aio_write %p %llx.%llx %llu~%zd getting caps. i_size %llu\n",
1398 inode, ceph_vinop(inode), pos, count, i_size_read(inode));
1399 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1400 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
1401 else
1402 want = CEPH_CAP_FILE_BUFFER;
1403 got = 0;
1404 err = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, pos + count,
1405 &got, NULL);
1406 if (err < 0)
1407 goto out;
1408
1409 dout("aio_write %p %llx.%llx %llu~%zd got cap refs on %s\n",
1410 inode, ceph_vinop(inode), pos, count, ceph_cap_string(got));
1411
1412 if ((got & (CEPH_CAP_FILE_BUFFER|CEPH_CAP_FILE_LAZYIO)) == 0 ||
1413 (iocb->ki_flags & IOCB_DIRECT) || (fi->flags & CEPH_F_SYNC)) {
1414 struct ceph_snap_context *snapc;
1415 struct iov_iter data;
1416 inode_unlock(inode);
1417
1418 spin_lock(&ci->i_ceph_lock);
1419 if (__ceph_have_pending_cap_snap(ci)) {
1420 struct ceph_cap_snap *capsnap =
1421 list_last_entry(&ci->i_cap_snaps,
1422 struct ceph_cap_snap,
1423 ci_item);
1424 snapc = ceph_get_snap_context(capsnap->context);
1425 } else {
1426 BUG_ON(!ci->i_head_snapc);
1427 snapc = ceph_get_snap_context(ci->i_head_snapc);
1428 }
1429 spin_unlock(&ci->i_ceph_lock);
1430
1431
1432 data = *from;
1433 if (iocb->ki_flags & IOCB_DIRECT)
1434 written = ceph_direct_read_write(iocb, &data, snapc,
1435 &prealloc_cf);
1436 else
1437 written = ceph_sync_write(iocb, &data, pos, snapc);
1438 if (written == -EOLDSNAPC) {
1439 dout("aio_write %p %llx.%llx %llu~%u"
1440 "got EOLDSNAPC, retrying\n",
1441 inode, ceph_vinop(inode),
1442 pos, (unsigned)count);
1443 inode_lock(inode);
1444 goto retry_snap;
1445 }
1446 if (written > 0)
1447 iov_iter_advance(from, written);
1448 ceph_put_snap_context(snapc);
1449 } else {
1450
1451
1452
1453
1454
1455
1456
1457 written = generic_perform_write(file, from, pos);
1458 if (likely(written >= 0))
1459 iocb->ki_pos = pos + written;
1460 inode_unlock(inode);
1461 }
1462
1463 if (written >= 0) {
1464 int dirty;
1465 spin_lock(&ci->i_ceph_lock);
1466 ci->i_inline_version = CEPH_INLINE_NONE;
1467 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
1468 &prealloc_cf);
1469 spin_unlock(&ci->i_ceph_lock);
1470 if (dirty)
1471 __mark_inode_dirty(inode, dirty);
1472 }
1473
1474 dout("aio_write %p %llx.%llx %llu~%u dropping cap refs on %s\n",
1475 inode, ceph_vinop(inode), pos, (unsigned)count,
1476 ceph_cap_string(got));
1477 ceph_put_cap_refs(ci, got);
1478
1479 if (written >= 0) {
1480 if (ceph_osdmap_flag(osdc, CEPH_OSDMAP_NEARFULL))
1481 iocb->ki_flags |= IOCB_DSYNC;
1482
1483 written = generic_write_sync(iocb, written);
1484 }
1485
1486 goto out_unlocked;
1487
1488out:
1489 inode_unlock(inode);
1490out_unlocked:
1491 ceph_free_cap_flush(prealloc_cf);
1492 current->backing_dev_info = NULL;
1493 return written ? written : err;
1494}
1495
1496
1497
1498
1499static loff_t ceph_llseek(struct file *file, loff_t offset, int whence)
1500{
1501 struct inode *inode = file->f_mapping->host;
1502 loff_t i_size;
1503 loff_t ret;
1504
1505 inode_lock(inode);
1506
1507 if (whence == SEEK_END || whence == SEEK_DATA || whence == SEEK_HOLE) {
1508 ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false);
1509 if (ret < 0)
1510 goto out;
1511 }
1512
1513 i_size = i_size_read(inode);
1514 switch (whence) {
1515 case SEEK_END:
1516 offset += i_size;
1517 break;
1518 case SEEK_CUR:
1519
1520
1521
1522
1523
1524
1525 if (offset == 0) {
1526 ret = file->f_pos;
1527 goto out;
1528 }
1529 offset += file->f_pos;
1530 break;
1531 case SEEK_DATA:
1532 if (offset >= i_size) {
1533 ret = -ENXIO;
1534 goto out;
1535 }
1536 break;
1537 case SEEK_HOLE:
1538 if (offset >= i_size) {
1539 ret = -ENXIO;
1540 goto out;
1541 }
1542 offset = i_size;
1543 break;
1544 }
1545
1546 ret = vfs_setpos(file, offset, inode->i_sb->s_maxbytes);
1547
1548out:
1549 inode_unlock(inode);
1550 return ret;
1551}
1552
1553static inline void ceph_zero_partial_page(
1554 struct inode *inode, loff_t offset, unsigned size)
1555{
1556 struct page *page;
1557 pgoff_t index = offset >> PAGE_SHIFT;
1558
1559 page = find_lock_page(inode->i_mapping, index);
1560 if (page) {
1561 wait_on_page_writeback(page);
1562 zero_user(page, offset & (PAGE_SIZE - 1), size);
1563 unlock_page(page);
1564 put_page(page);
1565 }
1566}
1567
1568static void ceph_zero_pagecache_range(struct inode *inode, loff_t offset,
1569 loff_t length)
1570{
1571 loff_t nearly = round_up(offset, PAGE_SIZE);
1572 if (offset < nearly) {
1573 loff_t size = nearly - offset;
1574 if (length < size)
1575 size = length;
1576 ceph_zero_partial_page(inode, offset, size);
1577 offset += size;
1578 length -= size;
1579 }
1580 if (length >= PAGE_SIZE) {
1581 loff_t size = round_down(length, PAGE_SIZE);
1582 truncate_pagecache_range(inode, offset, offset + size - 1);
1583 offset += size;
1584 length -= size;
1585 }
1586 if (length)
1587 ceph_zero_partial_page(inode, offset, length);
1588}
1589
1590static int ceph_zero_partial_object(struct inode *inode,
1591 loff_t offset, loff_t *length)
1592{
1593 struct ceph_inode_info *ci = ceph_inode(inode);
1594 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1595 struct ceph_osd_request *req;
1596 int ret = 0;
1597 loff_t zero = 0;
1598 int op;
1599
1600 if (!length) {
1601 op = offset ? CEPH_OSD_OP_DELETE : CEPH_OSD_OP_TRUNCATE;
1602 length = &zero;
1603 } else {
1604 op = CEPH_OSD_OP_ZERO;
1605 }
1606
1607 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1608 ceph_vino(inode),
1609 offset, length,
1610 0, 1, op,
1611 CEPH_OSD_FLAG_WRITE |
1612 CEPH_OSD_FLAG_ONDISK,
1613 NULL, 0, 0, false);
1614 if (IS_ERR(req)) {
1615 ret = PTR_ERR(req);
1616 goto out;
1617 }
1618
1619 req->r_mtime = inode->i_mtime;
1620 ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
1621 if (!ret) {
1622 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
1623 if (ret == -ENOENT)
1624 ret = 0;
1625 }
1626 ceph_osdc_put_request(req);
1627
1628out:
1629 return ret;
1630}
1631
1632static int ceph_zero_objects(struct inode *inode, loff_t offset, loff_t length)
1633{
1634 int ret = 0;
1635 struct ceph_inode_info *ci = ceph_inode(inode);
1636 s32 stripe_unit = ci->i_layout.stripe_unit;
1637 s32 stripe_count = ci->i_layout.stripe_count;
1638 s32 object_size = ci->i_layout.object_size;
1639 u64 object_set_size = object_size * stripe_count;
1640 u64 nearly, t;
1641
1642
1643 nearly = offset + object_set_size - 1;
1644 t = nearly;
1645 nearly -= do_div(t, object_set_size);
1646
1647 while (length && offset < nearly) {
1648 loff_t size = length;
1649 ret = ceph_zero_partial_object(inode, offset, &size);
1650 if (ret < 0)
1651 return ret;
1652 offset += size;
1653 length -= size;
1654 }
1655 while (length >= object_set_size) {
1656 int i;
1657 loff_t pos = offset;
1658 for (i = 0; i < stripe_count; ++i) {
1659 ret = ceph_zero_partial_object(inode, pos, NULL);
1660 if (ret < 0)
1661 return ret;
1662 pos += stripe_unit;
1663 }
1664 offset += object_set_size;
1665 length -= object_set_size;
1666 }
1667 while (length) {
1668 loff_t size = length;
1669 ret = ceph_zero_partial_object(inode, offset, &size);
1670 if (ret < 0)
1671 return ret;
1672 offset += size;
1673 length -= size;
1674 }
1675 return ret;
1676}
1677
1678static long ceph_fallocate(struct file *file, int mode,
1679 loff_t offset, loff_t length)
1680{
1681 struct ceph_file_info *fi = file->private_data;
1682 struct inode *inode = file_inode(file);
1683 struct ceph_inode_info *ci = ceph_inode(inode);
1684 struct ceph_osd_client *osdc =
1685 &ceph_inode_to_client(inode)->client->osdc;
1686 struct ceph_cap_flush *prealloc_cf;
1687 int want, got = 0;
1688 int dirty;
1689 int ret = 0;
1690 loff_t endoff = 0;
1691 loff_t size;
1692
1693 if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
1694 return -EOPNOTSUPP;
1695
1696 if (!S_ISREG(inode->i_mode))
1697 return -EOPNOTSUPP;
1698
1699 prealloc_cf = ceph_alloc_cap_flush();
1700 if (!prealloc_cf)
1701 return -ENOMEM;
1702
1703 inode_lock(inode);
1704
1705 if (ceph_snap(inode) != CEPH_NOSNAP) {
1706 ret = -EROFS;
1707 goto unlock;
1708 }
1709
1710 if (ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL) &&
1711 !(mode & FALLOC_FL_PUNCH_HOLE)) {
1712 ret = -ENOSPC;
1713 goto unlock;
1714 }
1715
1716 if (ci->i_inline_version != CEPH_INLINE_NONE) {
1717 ret = ceph_uninline_data(file, NULL);
1718 if (ret < 0)
1719 goto unlock;
1720 }
1721
1722 size = i_size_read(inode);
1723 if (!(mode & FALLOC_FL_KEEP_SIZE))
1724 endoff = offset + length;
1725
1726 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1727 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
1728 else
1729 want = CEPH_CAP_FILE_BUFFER;
1730
1731 ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, endoff, &got, NULL);
1732 if (ret < 0)
1733 goto unlock;
1734
1735 if (mode & FALLOC_FL_PUNCH_HOLE) {
1736 if (offset < size)
1737 ceph_zero_pagecache_range(inode, offset, length);
1738 ret = ceph_zero_objects(inode, offset, length);
1739 } else if (endoff > size) {
1740 truncate_pagecache_range(inode, size, -1);
1741 if (ceph_inode_set_size(inode, endoff))
1742 ceph_check_caps(ceph_inode(inode),
1743 CHECK_CAPS_AUTHONLY, NULL);
1744 }
1745
1746 if (!ret) {
1747 spin_lock(&ci->i_ceph_lock);
1748 ci->i_inline_version = CEPH_INLINE_NONE;
1749 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
1750 &prealloc_cf);
1751 spin_unlock(&ci->i_ceph_lock);
1752 if (dirty)
1753 __mark_inode_dirty(inode, dirty);
1754 }
1755
1756 ceph_put_cap_refs(ci, got);
1757unlock:
1758 inode_unlock(inode);
1759 ceph_free_cap_flush(prealloc_cf);
1760 return ret;
1761}
1762
1763const struct file_operations ceph_file_fops = {
1764 .open = ceph_open,
1765 .release = ceph_release,
1766 .llseek = ceph_llseek,
1767 .read_iter = ceph_read_iter,
1768 .write_iter = ceph_write_iter,
1769 .mmap = ceph_mmap,
1770 .fsync = ceph_fsync,
1771 .lock = ceph_lock,
1772 .flock = ceph_flock,
1773 .splice_write = iter_file_splice_write,
1774 .unlocked_ioctl = ceph_ioctl,
1775 .compat_ioctl = ceph_ioctl,
1776 .fallocate = ceph_fallocate,
1777};
1778
1779