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[mirror_ubuntu-bionic-kernel.git] / fs / ceph / file.c
1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/ceph/ceph_debug.h>
3
4 #include <linux/module.h>
5 #include <linux/sched.h>
6 #include <linux/slab.h>
7 #include <linux/file.h>
8 #include <linux/mount.h>
9 #include <linux/namei.h>
10 #include <linux/writeback.h>
11 #include <linux/falloc.h>
12
13 #include "super.h"
14 #include "mds_client.h"
15 #include "cache.h"
16
17 static __le32 ceph_flags_sys2wire(u32 flags)
18 {
19 u32 wire_flags = 0;
20
21 switch (flags & O_ACCMODE) {
22 case O_RDONLY:
23 wire_flags |= CEPH_O_RDONLY;
24 break;
25 case O_WRONLY:
26 wire_flags |= CEPH_O_WRONLY;
27 break;
28 case O_RDWR:
29 wire_flags |= CEPH_O_RDWR;
30 break;
31 }
32
33 #define ceph_sys2wire(a) if (flags & a) { wire_flags |= CEPH_##a; flags &= ~a; }
34
35 ceph_sys2wire(O_CREAT);
36 ceph_sys2wire(O_EXCL);
37 ceph_sys2wire(O_TRUNC);
38 ceph_sys2wire(O_DIRECTORY);
39 ceph_sys2wire(O_NOFOLLOW);
40
41 #undef ceph_sys2wire
42
43 if (flags)
44 dout("unused open flags: %x", flags);
45
46 return cpu_to_le32(wire_flags);
47 }
48
49 /*
50 * Ceph file operations
51 *
52 * Implement basic open/close functionality, and implement
53 * read/write.
54 *
55 * We implement three modes of file I/O:
56 * - buffered uses the generic_file_aio_{read,write} helpers
57 *
58 * - synchronous is used when there is multi-client read/write
59 * sharing, avoids the page cache, and synchronously waits for an
60 * ack from the OSD.
61 *
62 * - direct io takes the variant of the sync path that references
63 * user pages directly.
64 *
65 * fsync() flushes and waits on dirty pages, but just queues metadata
66 * for writeback: since the MDS can recover size and mtime there is no
67 * need to wait for MDS acknowledgement.
68 */
69
70 /*
71 * Calculate the length sum of direct io vectors that can
72 * be combined into one page vector.
73 */
74 static size_t dio_get_pagev_size(const struct iov_iter *it)
75 {
76 const struct iovec *iov = it->iov;
77 const struct iovec *iovend = iov + it->nr_segs;
78 size_t size;
79
80 size = iov->iov_len - it->iov_offset;
81 /*
82 * An iov can be page vectored when both the current tail
83 * and the next base are page aligned.
84 */
85 while (PAGE_ALIGNED((iov->iov_base + iov->iov_len)) &&
86 (++iov < iovend && PAGE_ALIGNED((iov->iov_base)))) {
87 size += iov->iov_len;
88 }
89 dout("dio_get_pagevlen len = %zu\n", size);
90 return size;
91 }
92
93 /*
94 * Allocate a page vector based on (@it, @nbytes).
95 * The return value is the tuple describing a page vector,
96 * that is (@pages, @page_align, @num_pages).
97 */
98 static struct page **
99 dio_get_pages_alloc(const struct iov_iter *it, size_t nbytes,
100 size_t *page_align, int *num_pages)
101 {
102 struct iov_iter tmp_it = *it;
103 size_t align;
104 struct page **pages;
105 int ret = 0, idx, npages;
106
107 align = (unsigned long)(it->iov->iov_base + it->iov_offset) &
108 (PAGE_SIZE - 1);
109 npages = calc_pages_for(align, nbytes);
110 pages = kvmalloc(sizeof(*pages) * npages, GFP_KERNEL);
111 if (!pages)
112 return ERR_PTR(-ENOMEM);
113
114 for (idx = 0; idx < npages; ) {
115 size_t start;
116 ret = iov_iter_get_pages(&tmp_it, pages + idx, nbytes,
117 npages - idx, &start);
118 if (ret < 0)
119 goto fail;
120
121 iov_iter_advance(&tmp_it, ret);
122 nbytes -= ret;
123 idx += (ret + start + PAGE_SIZE - 1) / PAGE_SIZE;
124 }
125
126 BUG_ON(nbytes != 0);
127 *num_pages = npages;
128 *page_align = align;
129 dout("dio_get_pages_alloc: got %d pages align %zu\n", npages, align);
130 return pages;
131 fail:
132 ceph_put_page_vector(pages, idx, false);
133 return ERR_PTR(ret);
134 }
135
136 /*
137 * Prepare an open request. Preallocate ceph_cap to avoid an
138 * inopportune ENOMEM later.
139 */
140 static struct ceph_mds_request *
141 prepare_open_request(struct super_block *sb, int flags, int create_mode)
142 {
143 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
144 struct ceph_mds_client *mdsc = fsc->mdsc;
145 struct ceph_mds_request *req;
146 int want_auth = USE_ANY_MDS;
147 int op = (flags & O_CREAT) ? CEPH_MDS_OP_CREATE : CEPH_MDS_OP_OPEN;
148
149 if (flags & (O_WRONLY|O_RDWR|O_CREAT|O_TRUNC))
150 want_auth = USE_AUTH_MDS;
151
152 req = ceph_mdsc_create_request(mdsc, op, want_auth);
153 if (IS_ERR(req))
154 goto out;
155 req->r_fmode = ceph_flags_to_mode(flags);
156 req->r_args.open.flags = ceph_flags_sys2wire(flags);
157 req->r_args.open.mode = cpu_to_le32(create_mode);
158 out:
159 return req;
160 }
161
162 /*
163 * initialize private struct file data.
164 * if we fail, clean up by dropping fmode reference on the ceph_inode
165 */
166 static int ceph_init_file(struct inode *inode, struct file *file, int fmode)
167 {
168 struct ceph_file_info *cf;
169 int ret = 0;
170
171 switch (inode->i_mode & S_IFMT) {
172 case S_IFREG:
173 ceph_fscache_register_inode_cookie(inode);
174 ceph_fscache_file_set_cookie(inode, file);
175 case S_IFDIR:
176 dout("init_file %p %p 0%o (regular)\n", inode, file,
177 inode->i_mode);
178 cf = kmem_cache_zalloc(ceph_file_cachep, GFP_KERNEL);
179 if (!cf) {
180 ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */
181 return -ENOMEM;
182 }
183 cf->fmode = fmode;
184
185 spin_lock_init(&cf->rw_contexts_lock);
186 INIT_LIST_HEAD(&cf->rw_contexts);
187
188 cf->next_offset = 2;
189 cf->readdir_cache_idx = -1;
190 file->private_data = cf;
191 BUG_ON(inode->i_fop->release != ceph_release);
192 break;
193
194 case S_IFLNK:
195 dout("init_file %p %p 0%o (symlink)\n", inode, file,
196 inode->i_mode);
197 ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */
198 break;
199
200 default:
201 dout("init_file %p %p 0%o (special)\n", inode, file,
202 inode->i_mode);
203 /*
204 * we need to drop the open ref now, since we don't
205 * have .release set to ceph_release.
206 */
207 ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */
208 BUG_ON(inode->i_fop->release == ceph_release);
209
210 /* call the proper open fop */
211 ret = inode->i_fop->open(inode, file);
212 }
213 return ret;
214 }
215
216 /*
217 * try renew caps after session gets killed.
218 */
219 int ceph_renew_caps(struct inode *inode)
220 {
221 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
222 struct ceph_inode_info *ci = ceph_inode(inode);
223 struct ceph_mds_request *req;
224 int err, flags, wanted;
225
226 spin_lock(&ci->i_ceph_lock);
227 wanted = __ceph_caps_file_wanted(ci);
228 if (__ceph_is_any_real_caps(ci) &&
229 (!(wanted & CEPH_CAP_ANY_WR) || ci->i_auth_cap)) {
230 int issued = __ceph_caps_issued(ci, NULL);
231 spin_unlock(&ci->i_ceph_lock);
232 dout("renew caps %p want %s issued %s updating mds_wanted\n",
233 inode, ceph_cap_string(wanted), ceph_cap_string(issued));
234 ceph_check_caps(ci, 0, NULL);
235 return 0;
236 }
237 spin_unlock(&ci->i_ceph_lock);
238
239 flags = 0;
240 if ((wanted & CEPH_CAP_FILE_RD) && (wanted & CEPH_CAP_FILE_WR))
241 flags = O_RDWR;
242 else if (wanted & CEPH_CAP_FILE_RD)
243 flags = O_RDONLY;
244 else if (wanted & CEPH_CAP_FILE_WR)
245 flags = O_WRONLY;
246 #ifdef O_LAZY
247 if (wanted & CEPH_CAP_FILE_LAZYIO)
248 flags |= O_LAZY;
249 #endif
250
251 req = prepare_open_request(inode->i_sb, flags, 0);
252 if (IS_ERR(req)) {
253 err = PTR_ERR(req);
254 goto out;
255 }
256
257 req->r_inode = inode;
258 ihold(inode);
259 req->r_num_caps = 1;
260 req->r_fmode = -1;
261
262 err = ceph_mdsc_do_request(mdsc, NULL, req);
263 ceph_mdsc_put_request(req);
264 out:
265 dout("renew caps %p open result=%d\n", inode, err);
266 return err < 0 ? err : 0;
267 }
268
269 /*
270 * If we already have the requisite capabilities, we can satisfy
271 * the open request locally (no need to request new caps from the
272 * MDS). We do, however, need to inform the MDS (asynchronously)
273 * if our wanted caps set expands.
274 */
275 int ceph_open(struct inode *inode, struct file *file)
276 {
277 struct ceph_inode_info *ci = ceph_inode(inode);
278 struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
279 struct ceph_mds_client *mdsc = fsc->mdsc;
280 struct ceph_mds_request *req;
281 struct ceph_file_info *cf = file->private_data;
282 int err;
283 int flags, fmode, wanted;
284
285 if (cf) {
286 dout("open file %p is already opened\n", file);
287 return 0;
288 }
289
290 /* filter out O_CREAT|O_EXCL; vfs did that already. yuck. */
291 flags = file->f_flags & ~(O_CREAT|O_EXCL);
292 if (S_ISDIR(inode->i_mode))
293 flags = O_DIRECTORY; /* mds likes to know */
294
295 dout("open inode %p ino %llx.%llx file %p flags %d (%d)\n", inode,
296 ceph_vinop(inode), file, flags, file->f_flags);
297 fmode = ceph_flags_to_mode(flags);
298 wanted = ceph_caps_for_mode(fmode);
299
300 /* snapped files are read-only */
301 if (ceph_snap(inode) != CEPH_NOSNAP && (file->f_mode & FMODE_WRITE))
302 return -EROFS;
303
304 /* trivially open snapdir */
305 if (ceph_snap(inode) == CEPH_SNAPDIR) {
306 spin_lock(&ci->i_ceph_lock);
307 __ceph_get_fmode(ci, fmode);
308 spin_unlock(&ci->i_ceph_lock);
309 return ceph_init_file(inode, file, fmode);
310 }
311
312 /*
313 * No need to block if we have caps on the auth MDS (for
314 * write) or any MDS (for read). Update wanted set
315 * asynchronously.
316 */
317 spin_lock(&ci->i_ceph_lock);
318 if (__ceph_is_any_real_caps(ci) &&
319 (((fmode & CEPH_FILE_MODE_WR) == 0) || ci->i_auth_cap)) {
320 int mds_wanted = __ceph_caps_mds_wanted(ci, true);
321 int issued = __ceph_caps_issued(ci, NULL);
322
323 dout("open %p fmode %d want %s issued %s using existing\n",
324 inode, fmode, ceph_cap_string(wanted),
325 ceph_cap_string(issued));
326 __ceph_get_fmode(ci, fmode);
327 spin_unlock(&ci->i_ceph_lock);
328
329 /* adjust wanted? */
330 if ((issued & wanted) != wanted &&
331 (mds_wanted & wanted) != wanted &&
332 ceph_snap(inode) != CEPH_SNAPDIR)
333 ceph_check_caps(ci, 0, NULL);
334
335 return ceph_init_file(inode, file, fmode);
336 } else if (ceph_snap(inode) != CEPH_NOSNAP &&
337 (ci->i_snap_caps & wanted) == wanted) {
338 __ceph_get_fmode(ci, fmode);
339 spin_unlock(&ci->i_ceph_lock);
340 return ceph_init_file(inode, file, fmode);
341 }
342
343 spin_unlock(&ci->i_ceph_lock);
344
345 dout("open fmode %d wants %s\n", fmode, ceph_cap_string(wanted));
346 req = prepare_open_request(inode->i_sb, flags, 0);
347 if (IS_ERR(req)) {
348 err = PTR_ERR(req);
349 goto out;
350 }
351 req->r_inode = inode;
352 ihold(inode);
353
354 req->r_num_caps = 1;
355 err = ceph_mdsc_do_request(mdsc, NULL, req);
356 if (!err)
357 err = ceph_init_file(inode, file, req->r_fmode);
358 ceph_mdsc_put_request(req);
359 dout("open result=%d on %llx.%llx\n", err, ceph_vinop(inode));
360 out:
361 return err;
362 }
363
364
365 /*
366 * Do a lookup + open with a single request. If we get a non-existent
367 * file or symlink, return 1 so the VFS can retry.
368 */
369 int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
370 struct file *file, unsigned flags, umode_t mode,
371 int *opened)
372 {
373 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
374 struct ceph_mds_client *mdsc = fsc->mdsc;
375 struct ceph_mds_request *req;
376 struct dentry *dn;
377 struct ceph_acls_info acls = {};
378 int mask;
379 int err;
380
381 dout("atomic_open %p dentry %p '%pd' %s flags %d mode 0%o\n",
382 dir, dentry, dentry,
383 d_unhashed(dentry) ? "unhashed" : "hashed", flags, mode);
384
385 if (dentry->d_name.len > NAME_MAX)
386 return -ENAMETOOLONG;
387
388 if (flags & O_CREAT) {
389 err = ceph_pre_init_acls(dir, &mode, &acls);
390 if (err < 0)
391 return err;
392 }
393
394 /* do the open */
395 req = prepare_open_request(dir->i_sb, flags, mode);
396 if (IS_ERR(req)) {
397 err = PTR_ERR(req);
398 goto out_acl;
399 }
400 req->r_dentry = dget(dentry);
401 req->r_num_caps = 2;
402 if (flags & O_CREAT) {
403 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
404 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
405 if (acls.pagelist) {
406 req->r_pagelist = acls.pagelist;
407 acls.pagelist = NULL;
408 }
409 }
410
411 mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED;
412 if (ceph_security_xattr_wanted(dir))
413 mask |= CEPH_CAP_XATTR_SHARED;
414 req->r_args.open.mask = cpu_to_le32(mask);
415
416 req->r_parent = dir;
417 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
418 err = ceph_mdsc_do_request(mdsc,
419 (flags & (O_CREAT|O_TRUNC)) ? dir : NULL,
420 req);
421 err = ceph_handle_snapdir(req, dentry, err);
422 if (err)
423 goto out_req;
424
425 if ((flags & O_CREAT) && !req->r_reply_info.head->is_dentry)
426 err = ceph_handle_notrace_create(dir, dentry);
427
428 if (d_in_lookup(dentry)) {
429 dn = ceph_finish_lookup(req, dentry, err);
430 if (IS_ERR(dn))
431 err = PTR_ERR(dn);
432 } else {
433 /* we were given a hashed negative dentry */
434 dn = NULL;
435 }
436 if (err)
437 goto out_req;
438 if (dn || d_really_is_negative(dentry) || d_is_symlink(dentry)) {
439 /* make vfs retry on splice, ENOENT, or symlink */
440 dout("atomic_open finish_no_open on dn %p\n", dn);
441 err = finish_no_open(file, dn);
442 } else {
443 dout("atomic_open finish_open on dn %p\n", dn);
444 if (req->r_op == CEPH_MDS_OP_CREATE && req->r_reply_info.has_create_ino) {
445 ceph_init_inode_acls(d_inode(dentry), &acls);
446 *opened |= FILE_CREATED;
447 }
448 err = finish_open(file, dentry, ceph_open, opened);
449 }
450 out_req:
451 if (!req->r_err && req->r_target_inode)
452 ceph_put_fmode(ceph_inode(req->r_target_inode), req->r_fmode);
453 ceph_mdsc_put_request(req);
454 out_acl:
455 ceph_release_acls_info(&acls);
456 dout("atomic_open result=%d\n", err);
457 return err;
458 }
459
460 int ceph_release(struct inode *inode, struct file *file)
461 {
462 struct ceph_inode_info *ci = ceph_inode(inode);
463 struct ceph_file_info *cf = file->private_data;
464
465 dout("release inode %p file %p\n", inode, file);
466 ceph_put_fmode(ci, cf->fmode);
467 if (cf->last_readdir)
468 ceph_mdsc_put_request(cf->last_readdir);
469 kfree(cf->last_name);
470 kfree(cf->dir_info);
471 WARN_ON(!list_empty(&cf->rw_contexts));
472 kmem_cache_free(ceph_file_cachep, cf);
473
474 /* wake up anyone waiting for caps on this inode */
475 wake_up_all(&ci->i_cap_wq);
476 return 0;
477 }
478
479 enum {
480 HAVE_RETRIED = 1,
481 CHECK_EOF = 2,
482 READ_INLINE = 3,
483 };
484
485 /*
486 * Read a range of bytes striped over one or more objects. Iterate over
487 * objects we stripe over. (That's not atomic, but good enough for now.)
488 *
489 * If we get a short result from the OSD, check against i_size; we need to
490 * only return a short read to the caller if we hit EOF.
491 */
492 static int striped_read(struct inode *inode,
493 u64 pos, u64 len,
494 struct page **pages, int num_pages,
495 int page_align, int *checkeof)
496 {
497 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
498 struct ceph_inode_info *ci = ceph_inode(inode);
499 u64 this_len;
500 loff_t i_size;
501 int page_idx;
502 int ret, read = 0;
503 bool hit_stripe, was_short;
504
505 /*
506 * we may need to do multiple reads. not atomic, unfortunately.
507 */
508 more:
509 this_len = len;
510 page_idx = (page_align + read) >> PAGE_SHIFT;
511 ret = ceph_osdc_readpages(&fsc->client->osdc, ceph_vino(inode),
512 &ci->i_layout, pos, &this_len,
513 ci->i_truncate_seq, ci->i_truncate_size,
514 pages + page_idx, num_pages - page_idx,
515 ((page_align + read) & ~PAGE_MASK));
516 if (ret == -ENOENT)
517 ret = 0;
518 hit_stripe = this_len < len;
519 was_short = ret >= 0 && ret < this_len;
520 dout("striped_read %llu~%llu (read %u) got %d%s%s\n", pos, len, read,
521 ret, hit_stripe ? " HITSTRIPE" : "", was_short ? " SHORT" : "");
522
523 i_size = i_size_read(inode);
524 if (ret >= 0) {
525 if (was_short && (pos + ret < i_size)) {
526 int zlen = min(this_len - ret, i_size - pos - ret);
527 int zoff = page_align + read + ret;
528 dout(" zero gap %llu to %llu\n",
529 pos + ret, pos + ret + zlen);
530 ceph_zero_page_vector_range(zoff, zlen, pages);
531 ret += zlen;
532 }
533
534 read += ret;
535 pos += ret;
536 len -= ret;
537
538 /* hit stripe and need continue*/
539 if (len && hit_stripe && pos < i_size)
540 goto more;
541 }
542
543 if (read > 0) {
544 ret = read;
545 /* did we bounce off eof? */
546 if (pos + len > i_size)
547 *checkeof = CHECK_EOF;
548 }
549
550 dout("striped_read returns %d\n", ret);
551 return ret;
552 }
553
554 /*
555 * Completely synchronous read and write methods. Direct from __user
556 * buffer to osd, or directly to user pages (if O_DIRECT).
557 *
558 * If the read spans object boundary, just do multiple reads.
559 */
560 static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *to,
561 int *checkeof)
562 {
563 struct file *file = iocb->ki_filp;
564 struct inode *inode = file_inode(file);
565 struct page **pages;
566 u64 off = iocb->ki_pos;
567 int num_pages;
568 ssize_t ret;
569 size_t len = iov_iter_count(to);
570
571 dout("sync_read on file %p %llu~%u %s\n", file, off, (unsigned)len,
572 (file->f_flags & O_DIRECT) ? "O_DIRECT" : "");
573
574 if (!len)
575 return 0;
576 /*
577 * flush any page cache pages in this range. this
578 * will make concurrent normal and sync io slow,
579 * but it will at least behave sensibly when they are
580 * in sequence.
581 */
582 ret = filemap_write_and_wait_range(inode->i_mapping, off,
583 off + len);
584 if (ret < 0)
585 return ret;
586
587 if (unlikely(to->type & ITER_PIPE)) {
588 size_t page_off;
589 ret = iov_iter_get_pages_alloc(to, &pages, len,
590 &page_off);
591 if (ret <= 0)
592 return -ENOMEM;
593 num_pages = DIV_ROUND_UP(ret + page_off, PAGE_SIZE);
594
595 ret = striped_read(inode, off, ret, pages, num_pages,
596 page_off, checkeof);
597 if (ret > 0) {
598 iov_iter_advance(to, ret);
599 off += ret;
600 } else {
601 iov_iter_advance(to, 0);
602 }
603 ceph_put_page_vector(pages, num_pages, false);
604 } else {
605 num_pages = calc_pages_for(off, len);
606 pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL);
607 if (IS_ERR(pages))
608 return PTR_ERR(pages);
609
610 ret = striped_read(inode, off, len, pages, num_pages,
611 (off & ~PAGE_MASK), checkeof);
612 if (ret > 0) {
613 int l, k = 0;
614 size_t left = ret;
615
616 while (left) {
617 size_t page_off = off & ~PAGE_MASK;
618 size_t copy = min_t(size_t, left,
619 PAGE_SIZE - page_off);
620 l = copy_page_to_iter(pages[k++], page_off,
621 copy, to);
622 off += l;
623 left -= l;
624 if (l < copy)
625 break;
626 }
627 }
628 ceph_release_page_vector(pages, num_pages);
629 }
630
631 if (off > iocb->ki_pos) {
632 ret = off - iocb->ki_pos;
633 iocb->ki_pos = off;
634 }
635
636 dout("sync_read result %zd\n", ret);
637 return ret;
638 }
639
640 struct ceph_aio_request {
641 struct kiocb *iocb;
642 size_t total_len;
643 bool write;
644 bool should_dirty;
645 int error;
646 struct list_head osd_reqs;
647 unsigned num_reqs;
648 atomic_t pending_reqs;
649 struct timespec mtime;
650 struct ceph_cap_flush *prealloc_cf;
651 };
652
653 struct ceph_aio_work {
654 struct work_struct work;
655 struct ceph_osd_request *req;
656 };
657
658 static void ceph_aio_retry_work(struct work_struct *work);
659
660 static void ceph_aio_complete(struct inode *inode,
661 struct ceph_aio_request *aio_req)
662 {
663 struct ceph_inode_info *ci = ceph_inode(inode);
664 int ret;
665
666 if (!atomic_dec_and_test(&aio_req->pending_reqs))
667 return;
668
669 ret = aio_req->error;
670 if (!ret)
671 ret = aio_req->total_len;
672
673 dout("ceph_aio_complete %p rc %d\n", inode, ret);
674
675 if (ret >= 0 && aio_req->write) {
676 int dirty;
677
678 loff_t endoff = aio_req->iocb->ki_pos + aio_req->total_len;
679 if (endoff > i_size_read(inode)) {
680 if (ceph_inode_set_size(inode, endoff))
681 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
682 }
683
684 spin_lock(&ci->i_ceph_lock);
685 ci->i_inline_version = CEPH_INLINE_NONE;
686 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
687 &aio_req->prealloc_cf);
688 spin_unlock(&ci->i_ceph_lock);
689 if (dirty)
690 __mark_inode_dirty(inode, dirty);
691
692 }
693
694 ceph_put_cap_refs(ci, (aio_req->write ? CEPH_CAP_FILE_WR :
695 CEPH_CAP_FILE_RD));
696
697 aio_req->iocb->ki_complete(aio_req->iocb, ret, 0);
698
699 ceph_free_cap_flush(aio_req->prealloc_cf);
700 kfree(aio_req);
701 }
702
703 static void ceph_aio_complete_req(struct ceph_osd_request *req)
704 {
705 int rc = req->r_result;
706 struct inode *inode = req->r_inode;
707 struct ceph_aio_request *aio_req = req->r_priv;
708 struct ceph_osd_data *osd_data = osd_req_op_extent_osd_data(req, 0);
709 int num_pages = calc_pages_for((u64)osd_data->alignment,
710 osd_data->length);
711
712 dout("ceph_aio_complete_req %p rc %d bytes %llu\n",
713 inode, rc, osd_data->length);
714
715 if (rc == -EOLDSNAPC) {
716 struct ceph_aio_work *aio_work;
717 BUG_ON(!aio_req->write);
718
719 aio_work = kmalloc(sizeof(*aio_work), GFP_NOFS);
720 if (aio_work) {
721 INIT_WORK(&aio_work->work, ceph_aio_retry_work);
722 aio_work->req = req;
723 queue_work(ceph_inode_to_client(inode)->inode_wq,
724 &aio_work->work);
725 return;
726 }
727 rc = -ENOMEM;
728 } else if (!aio_req->write) {
729 if (rc == -ENOENT)
730 rc = 0;
731 if (rc >= 0 && osd_data->length > rc) {
732 int zoff = osd_data->alignment + rc;
733 int zlen = osd_data->length - rc;
734 /*
735 * If read is satisfied by single OSD request,
736 * it can pass EOF. Otherwise read is within
737 * i_size.
738 */
739 if (aio_req->num_reqs == 1) {
740 loff_t i_size = i_size_read(inode);
741 loff_t endoff = aio_req->iocb->ki_pos + rc;
742 if (endoff < i_size)
743 zlen = min_t(size_t, zlen,
744 i_size - endoff);
745 aio_req->total_len = rc + zlen;
746 }
747
748 if (zlen > 0)
749 ceph_zero_page_vector_range(zoff, zlen,
750 osd_data->pages);
751 }
752 }
753
754 ceph_put_page_vector(osd_data->pages, num_pages, aio_req->should_dirty);
755 ceph_osdc_put_request(req);
756
757 if (rc < 0)
758 cmpxchg(&aio_req->error, 0, rc);
759
760 ceph_aio_complete(inode, aio_req);
761 return;
762 }
763
764 static void ceph_aio_retry_work(struct work_struct *work)
765 {
766 struct ceph_aio_work *aio_work =
767 container_of(work, struct ceph_aio_work, work);
768 struct ceph_osd_request *orig_req = aio_work->req;
769 struct ceph_aio_request *aio_req = orig_req->r_priv;
770 struct inode *inode = orig_req->r_inode;
771 struct ceph_inode_info *ci = ceph_inode(inode);
772 struct ceph_snap_context *snapc;
773 struct ceph_osd_request *req;
774 int ret;
775
776 spin_lock(&ci->i_ceph_lock);
777 if (__ceph_have_pending_cap_snap(ci)) {
778 struct ceph_cap_snap *capsnap =
779 list_last_entry(&ci->i_cap_snaps,
780 struct ceph_cap_snap,
781 ci_item);
782 snapc = ceph_get_snap_context(capsnap->context);
783 } else {
784 BUG_ON(!ci->i_head_snapc);
785 snapc = ceph_get_snap_context(ci->i_head_snapc);
786 }
787 spin_unlock(&ci->i_ceph_lock);
788
789 req = ceph_osdc_alloc_request(orig_req->r_osdc, snapc, 2,
790 false, GFP_NOFS);
791 if (!req) {
792 ret = -ENOMEM;
793 req = orig_req;
794 goto out;
795 }
796
797 req->r_flags = /* CEPH_OSD_FLAG_ORDERSNAP | */ CEPH_OSD_FLAG_WRITE;
798 ceph_oloc_copy(&req->r_base_oloc, &orig_req->r_base_oloc);
799 ceph_oid_copy(&req->r_base_oid, &orig_req->r_base_oid);
800
801 ret = ceph_osdc_alloc_messages(req, GFP_NOFS);
802 if (ret) {
803 ceph_osdc_put_request(req);
804 req = orig_req;
805 goto out;
806 }
807
808 req->r_ops[0] = orig_req->r_ops[0];
809
810 req->r_mtime = aio_req->mtime;
811 req->r_data_offset = req->r_ops[0].extent.offset;
812
813 ceph_osdc_put_request(orig_req);
814
815 req->r_callback = ceph_aio_complete_req;
816 req->r_inode = inode;
817 req->r_priv = aio_req;
818 req->r_abort_on_full = true;
819
820 ret = ceph_osdc_start_request(req->r_osdc, req, false);
821 out:
822 if (ret < 0) {
823 req->r_result = ret;
824 ceph_aio_complete_req(req);
825 }
826
827 ceph_put_snap_context(snapc);
828 kfree(aio_work);
829 }
830
831 static ssize_t
832 ceph_direct_read_write(struct kiocb *iocb, struct iov_iter *iter,
833 struct ceph_snap_context *snapc,
834 struct ceph_cap_flush **pcf)
835 {
836 struct file *file = iocb->ki_filp;
837 struct inode *inode = file_inode(file);
838 struct ceph_inode_info *ci = ceph_inode(inode);
839 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
840 struct ceph_vino vino;
841 struct ceph_osd_request *req;
842 struct page **pages;
843 struct ceph_aio_request *aio_req = NULL;
844 int num_pages = 0;
845 int flags;
846 int ret;
847 struct timespec mtime = current_time(inode);
848 size_t count = iov_iter_count(iter);
849 loff_t pos = iocb->ki_pos;
850 bool write = iov_iter_rw(iter) == WRITE;
851 bool should_dirty = !write && iter_is_iovec(iter);
852
853 if (write && ceph_snap(file_inode(file)) != CEPH_NOSNAP)
854 return -EROFS;
855
856 dout("sync_direct_%s on file %p %lld~%u snapc %p seq %lld\n",
857 (write ? "write" : "read"), file, pos, (unsigned)count,
858 snapc, snapc->seq);
859
860 ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + count);
861 if (ret < 0)
862 return ret;
863
864 if (write) {
865 int ret2 = invalidate_inode_pages2_range(inode->i_mapping,
866 pos >> PAGE_SHIFT,
867 (pos + count) >> PAGE_SHIFT);
868 if (ret2 < 0)
869 dout("invalidate_inode_pages2_range returned %d\n", ret2);
870
871 flags = /* CEPH_OSD_FLAG_ORDERSNAP | */ CEPH_OSD_FLAG_WRITE;
872 } else {
873 flags = CEPH_OSD_FLAG_READ;
874 }
875
876 while (iov_iter_count(iter) > 0) {
877 u64 size = dio_get_pagev_size(iter);
878 size_t start = 0;
879 ssize_t len;
880
881 if (write)
882 size = min_t(u64, size, fsc->mount_options->wsize);
883 else
884 size = min_t(u64, size, fsc->mount_options->rsize);
885
886 vino = ceph_vino(inode);
887 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
888 vino, pos, &size, 0,
889 1,
890 write ? CEPH_OSD_OP_WRITE :
891 CEPH_OSD_OP_READ,
892 flags, snapc,
893 ci->i_truncate_seq,
894 ci->i_truncate_size,
895 false);
896 if (IS_ERR(req)) {
897 ret = PTR_ERR(req);
898 break;
899 }
900
901 len = size;
902 pages = dio_get_pages_alloc(iter, len, &start, &num_pages);
903 if (IS_ERR(pages)) {
904 ceph_osdc_put_request(req);
905 ret = PTR_ERR(pages);
906 break;
907 }
908
909 /*
910 * To simplify error handling, allow AIO when IO within i_size
911 * or IO can be satisfied by single OSD request.
912 */
913 if (pos == iocb->ki_pos && !is_sync_kiocb(iocb) &&
914 (len == count || pos + count <= i_size_read(inode))) {
915 aio_req = kzalloc(sizeof(*aio_req), GFP_KERNEL);
916 if (aio_req) {
917 aio_req->iocb = iocb;
918 aio_req->write = write;
919 aio_req->should_dirty = should_dirty;
920 INIT_LIST_HEAD(&aio_req->osd_reqs);
921 if (write) {
922 aio_req->mtime = mtime;
923 swap(aio_req->prealloc_cf, *pcf);
924 }
925 }
926 /* ignore error */
927 }
928
929 if (write) {
930 /*
931 * throw out any page cache pages in this range. this
932 * may block.
933 */
934 truncate_inode_pages_range(inode->i_mapping, pos,
935 (pos+len) | (PAGE_SIZE - 1));
936
937 req->r_mtime = mtime;
938 }
939
940 osd_req_op_extent_osd_data_pages(req, 0, pages, len, start,
941 false, false);
942
943 if (aio_req) {
944 aio_req->total_len += len;
945 aio_req->num_reqs++;
946 atomic_inc(&aio_req->pending_reqs);
947
948 req->r_callback = ceph_aio_complete_req;
949 req->r_inode = inode;
950 req->r_priv = aio_req;
951 list_add_tail(&req->r_unsafe_item, &aio_req->osd_reqs);
952
953 pos += len;
954 iov_iter_advance(iter, len);
955 continue;
956 }
957
958 ret = ceph_osdc_start_request(req->r_osdc, req, false);
959 if (!ret)
960 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
961
962 size = i_size_read(inode);
963 if (!write) {
964 if (ret == -ENOENT)
965 ret = 0;
966 if (ret >= 0 && ret < len && pos + ret < size) {
967 int zlen = min_t(size_t, len - ret,
968 size - pos - ret);
969 ceph_zero_page_vector_range(start + ret, zlen,
970 pages);
971 ret += zlen;
972 }
973 if (ret >= 0)
974 len = ret;
975 }
976
977 ceph_put_page_vector(pages, num_pages, should_dirty);
978
979 ceph_osdc_put_request(req);
980 if (ret < 0)
981 break;
982
983 pos += len;
984 iov_iter_advance(iter, len);
985
986 if (!write && pos >= size)
987 break;
988
989 if (write && pos > size) {
990 if (ceph_inode_set_size(inode, pos))
991 ceph_check_caps(ceph_inode(inode),
992 CHECK_CAPS_AUTHONLY,
993 NULL);
994 }
995 }
996
997 if (aio_req) {
998 LIST_HEAD(osd_reqs);
999
1000 if (aio_req->num_reqs == 0) {
1001 kfree(aio_req);
1002 return ret;
1003 }
1004
1005 ceph_get_cap_refs(ci, write ? CEPH_CAP_FILE_WR :
1006 CEPH_CAP_FILE_RD);
1007
1008 list_splice(&aio_req->osd_reqs, &osd_reqs);
1009 while (!list_empty(&osd_reqs)) {
1010 req = list_first_entry(&osd_reqs,
1011 struct ceph_osd_request,
1012 r_unsafe_item);
1013 list_del_init(&req->r_unsafe_item);
1014 if (ret >= 0)
1015 ret = ceph_osdc_start_request(req->r_osdc,
1016 req, false);
1017 if (ret < 0) {
1018 req->r_result = ret;
1019 ceph_aio_complete_req(req);
1020 }
1021 }
1022 return -EIOCBQUEUED;
1023 }
1024
1025 if (ret != -EOLDSNAPC && pos > iocb->ki_pos) {
1026 ret = pos - iocb->ki_pos;
1027 iocb->ki_pos = pos;
1028 }
1029 return ret;
1030 }
1031
1032 /*
1033 * Synchronous write, straight from __user pointer or user pages.
1034 *
1035 * If write spans object boundary, just do multiple writes. (For a
1036 * correct atomic write, we should e.g. take write locks on all
1037 * objects, rollback on failure, etc.)
1038 */
1039 static ssize_t
1040 ceph_sync_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos,
1041 struct ceph_snap_context *snapc)
1042 {
1043 struct file *file = iocb->ki_filp;
1044 struct inode *inode = file_inode(file);
1045 struct ceph_inode_info *ci = ceph_inode(inode);
1046 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1047 struct ceph_vino vino;
1048 struct ceph_osd_request *req;
1049 struct page **pages;
1050 u64 len;
1051 int num_pages;
1052 int written = 0;
1053 int flags;
1054 int ret;
1055 bool check_caps = false;
1056 struct timespec mtime = current_time(inode);
1057 size_t count = iov_iter_count(from);
1058
1059 if (ceph_snap(file_inode(file)) != CEPH_NOSNAP)
1060 return -EROFS;
1061
1062 dout("sync_write on file %p %lld~%u snapc %p seq %lld\n",
1063 file, pos, (unsigned)count, snapc, snapc->seq);
1064
1065 ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + count);
1066 if (ret < 0)
1067 return ret;
1068
1069 ret = invalidate_inode_pages2_range(inode->i_mapping,
1070 pos >> PAGE_SHIFT,
1071 (pos + count) >> PAGE_SHIFT);
1072 if (ret < 0)
1073 dout("invalidate_inode_pages2_range returned %d\n", ret);
1074
1075 flags = /* CEPH_OSD_FLAG_ORDERSNAP | */ CEPH_OSD_FLAG_WRITE;
1076
1077 while ((len = iov_iter_count(from)) > 0) {
1078 size_t left;
1079 int n;
1080
1081 vino = ceph_vino(inode);
1082 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1083 vino, pos, &len, 0, 1,
1084 CEPH_OSD_OP_WRITE, flags, snapc,
1085 ci->i_truncate_seq,
1086 ci->i_truncate_size,
1087 false);
1088 if (IS_ERR(req)) {
1089 ret = PTR_ERR(req);
1090 break;
1091 }
1092
1093 /*
1094 * write from beginning of first page,
1095 * regardless of io alignment
1096 */
1097 num_pages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
1098
1099 pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL);
1100 if (IS_ERR(pages)) {
1101 ret = PTR_ERR(pages);
1102 goto out;
1103 }
1104
1105 left = len;
1106 for (n = 0; n < num_pages; n++) {
1107 size_t plen = min_t(size_t, left, PAGE_SIZE);
1108 ret = copy_page_from_iter(pages[n], 0, plen, from);
1109 if (ret != plen) {
1110 ret = -EFAULT;
1111 break;
1112 }
1113 left -= ret;
1114 }
1115
1116 if (ret < 0) {
1117 ceph_release_page_vector(pages, num_pages);
1118 goto out;
1119 }
1120
1121 req->r_inode = inode;
1122
1123 osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0,
1124 false, true);
1125
1126 req->r_mtime = mtime;
1127 ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
1128 if (!ret)
1129 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
1130
1131 out:
1132 ceph_osdc_put_request(req);
1133 if (ret != 0) {
1134 ceph_set_error_write(ci);
1135 break;
1136 }
1137
1138 ceph_clear_error_write(ci);
1139 pos += len;
1140 written += len;
1141 if (pos > i_size_read(inode)) {
1142 check_caps = ceph_inode_set_size(inode, pos);
1143 if (check_caps)
1144 ceph_check_caps(ceph_inode(inode),
1145 CHECK_CAPS_AUTHONLY,
1146 NULL);
1147 }
1148
1149 }
1150
1151 if (ret != -EOLDSNAPC && written > 0) {
1152 ret = written;
1153 iocb->ki_pos = pos;
1154 }
1155 return ret;
1156 }
1157
1158 /*
1159 * Wrap generic_file_aio_read with checks for cap bits on the inode.
1160 * Atomically grab references, so that those bits are not released
1161 * back to the MDS mid-read.
1162 *
1163 * Hmm, the sync read case isn't actually async... should it be?
1164 */
1165 static ssize_t ceph_read_iter(struct kiocb *iocb, struct iov_iter *to)
1166 {
1167 struct file *filp = iocb->ki_filp;
1168 struct ceph_file_info *fi = filp->private_data;
1169 size_t len = iov_iter_count(to);
1170 struct inode *inode = file_inode(filp);
1171 struct ceph_inode_info *ci = ceph_inode(inode);
1172 struct page *pinned_page = NULL;
1173 ssize_t ret;
1174 int want, got = 0;
1175 int retry_op = 0, read = 0;
1176
1177 again:
1178 dout("aio_read %p %llx.%llx %llu~%u trying to get caps on %p\n",
1179 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len, inode);
1180
1181 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1182 want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
1183 else
1184 want = CEPH_CAP_FILE_CACHE;
1185 ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, -1, &got, &pinned_page);
1186 if (ret < 0)
1187 return ret;
1188
1189 if ((got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0 ||
1190 (iocb->ki_flags & IOCB_DIRECT) ||
1191 (fi->flags & CEPH_F_SYNC)) {
1192
1193 dout("aio_sync_read %p %llx.%llx %llu~%u got cap refs on %s\n",
1194 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
1195 ceph_cap_string(got));
1196
1197 if (ci->i_inline_version == CEPH_INLINE_NONE) {
1198 if (!retry_op && (iocb->ki_flags & IOCB_DIRECT)) {
1199 ret = ceph_direct_read_write(iocb, to,
1200 NULL, NULL);
1201 if (ret >= 0 && ret < len)
1202 retry_op = CHECK_EOF;
1203 } else {
1204 ret = ceph_sync_read(iocb, to, &retry_op);
1205 }
1206 } else {
1207 retry_op = READ_INLINE;
1208 }
1209 } else {
1210 CEPH_DEFINE_RW_CONTEXT(rw_ctx, got);
1211 dout("aio_read %p %llx.%llx %llu~%u got cap refs on %s\n",
1212 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
1213 ceph_cap_string(got));
1214 ceph_add_rw_context(fi, &rw_ctx);
1215 ret = generic_file_read_iter(iocb, to);
1216 ceph_del_rw_context(fi, &rw_ctx);
1217 }
1218 dout("aio_read %p %llx.%llx dropping cap refs on %s = %d\n",
1219 inode, ceph_vinop(inode), ceph_cap_string(got), (int)ret);
1220 if (pinned_page) {
1221 put_page(pinned_page);
1222 pinned_page = NULL;
1223 }
1224 ceph_put_cap_refs(ci, got);
1225 if (retry_op > HAVE_RETRIED && ret >= 0) {
1226 int statret;
1227 struct page *page = NULL;
1228 loff_t i_size;
1229 if (retry_op == READ_INLINE) {
1230 page = __page_cache_alloc(GFP_KERNEL);
1231 if (!page)
1232 return -ENOMEM;
1233 }
1234
1235 statret = __ceph_do_getattr(inode, page,
1236 CEPH_STAT_CAP_INLINE_DATA, !!page);
1237 if (statret < 0) {
1238 if (page)
1239 __free_page(page);
1240 if (statret == -ENODATA) {
1241 BUG_ON(retry_op != READ_INLINE);
1242 goto again;
1243 }
1244 return statret;
1245 }
1246
1247 i_size = i_size_read(inode);
1248 if (retry_op == READ_INLINE) {
1249 BUG_ON(ret > 0 || read > 0);
1250 if (iocb->ki_pos < i_size &&
1251 iocb->ki_pos < PAGE_SIZE) {
1252 loff_t end = min_t(loff_t, i_size,
1253 iocb->ki_pos + len);
1254 end = min_t(loff_t, end, PAGE_SIZE);
1255 if (statret < end)
1256 zero_user_segment(page, statret, end);
1257 ret = copy_page_to_iter(page,
1258 iocb->ki_pos & ~PAGE_MASK,
1259 end - iocb->ki_pos, to);
1260 iocb->ki_pos += ret;
1261 read += ret;
1262 }
1263 if (iocb->ki_pos < i_size && read < len) {
1264 size_t zlen = min_t(size_t, len - read,
1265 i_size - iocb->ki_pos);
1266 ret = iov_iter_zero(zlen, to);
1267 iocb->ki_pos += ret;
1268 read += ret;
1269 }
1270 __free_pages(page, 0);
1271 return read;
1272 }
1273
1274 /* hit EOF or hole? */
1275 if (retry_op == CHECK_EOF && iocb->ki_pos < i_size &&
1276 ret < len) {
1277 dout("sync_read hit hole, ppos %lld < size %lld"
1278 ", reading more\n", iocb->ki_pos, i_size);
1279
1280 read += ret;
1281 len -= ret;
1282 retry_op = HAVE_RETRIED;
1283 goto again;
1284 }
1285 }
1286
1287 if (ret >= 0)
1288 ret += read;
1289
1290 return ret;
1291 }
1292
1293 /*
1294 * Take cap references to avoid releasing caps to MDS mid-write.
1295 *
1296 * If we are synchronous, and write with an old snap context, the OSD
1297 * may return EOLDSNAPC. In that case, retry the write.. _after_
1298 * dropping our cap refs and allowing the pending snap to logically
1299 * complete _before_ this write occurs.
1300 *
1301 * If we are near ENOSPC, write synchronously.
1302 */
1303 static ssize_t ceph_write_iter(struct kiocb *iocb, struct iov_iter *from)
1304 {
1305 struct file *file = iocb->ki_filp;
1306 struct ceph_file_info *fi = file->private_data;
1307 struct inode *inode = file_inode(file);
1308 struct ceph_inode_info *ci = ceph_inode(inode);
1309 struct ceph_osd_client *osdc =
1310 &ceph_sb_to_client(inode->i_sb)->client->osdc;
1311 struct ceph_cap_flush *prealloc_cf;
1312 ssize_t count, written = 0;
1313 int err, want, got;
1314 loff_t pos;
1315
1316 if (ceph_snap(inode) != CEPH_NOSNAP)
1317 return -EROFS;
1318
1319 prealloc_cf = ceph_alloc_cap_flush();
1320 if (!prealloc_cf)
1321 return -ENOMEM;
1322
1323 retry_snap:
1324 inode_lock(inode);
1325
1326 /* We can write back this queue in page reclaim */
1327 current->backing_dev_info = inode_to_bdi(inode);
1328
1329 if (iocb->ki_flags & IOCB_APPEND) {
1330 err = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false);
1331 if (err < 0)
1332 goto out;
1333 }
1334
1335 err = generic_write_checks(iocb, from);
1336 if (err <= 0)
1337 goto out;
1338
1339 pos = iocb->ki_pos;
1340 count = iov_iter_count(from);
1341 err = file_remove_privs(file);
1342 if (err)
1343 goto out;
1344
1345 err = file_update_time(file);
1346 if (err)
1347 goto out;
1348
1349 if (ci->i_inline_version != CEPH_INLINE_NONE) {
1350 err = ceph_uninline_data(file, NULL);
1351 if (err < 0)
1352 goto out;
1353 }
1354
1355 /* FIXME: not complete since it doesn't account for being at quota */
1356 if (ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL)) {
1357 err = -ENOSPC;
1358 goto out;
1359 }
1360
1361 dout("aio_write %p %llx.%llx %llu~%zd getting caps. i_size %llu\n",
1362 inode, ceph_vinop(inode), pos, count, i_size_read(inode));
1363 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1364 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
1365 else
1366 want = CEPH_CAP_FILE_BUFFER;
1367 got = 0;
1368 err = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, pos + count,
1369 &got, NULL);
1370 if (err < 0)
1371 goto out;
1372
1373 dout("aio_write %p %llx.%llx %llu~%zd got cap refs on %s\n",
1374 inode, ceph_vinop(inode), pos, count, ceph_cap_string(got));
1375
1376 if ((got & (CEPH_CAP_FILE_BUFFER|CEPH_CAP_FILE_LAZYIO)) == 0 ||
1377 (iocb->ki_flags & IOCB_DIRECT) || (fi->flags & CEPH_F_SYNC) ||
1378 (ci->i_ceph_flags & CEPH_I_ERROR_WRITE)) {
1379 struct ceph_snap_context *snapc;
1380 struct iov_iter data;
1381 inode_unlock(inode);
1382
1383 spin_lock(&ci->i_ceph_lock);
1384 if (__ceph_have_pending_cap_snap(ci)) {
1385 struct ceph_cap_snap *capsnap =
1386 list_last_entry(&ci->i_cap_snaps,
1387 struct ceph_cap_snap,
1388 ci_item);
1389 snapc = ceph_get_snap_context(capsnap->context);
1390 } else {
1391 BUG_ON(!ci->i_head_snapc);
1392 snapc = ceph_get_snap_context(ci->i_head_snapc);
1393 }
1394 spin_unlock(&ci->i_ceph_lock);
1395
1396 /* we might need to revert back to that point */
1397 data = *from;
1398 if (iocb->ki_flags & IOCB_DIRECT)
1399 written = ceph_direct_read_write(iocb, &data, snapc,
1400 &prealloc_cf);
1401 else
1402 written = ceph_sync_write(iocb, &data, pos, snapc);
1403 if (written > 0)
1404 iov_iter_advance(from, written);
1405 ceph_put_snap_context(snapc);
1406 } else {
1407 /*
1408 * No need to acquire the i_truncate_mutex. Because
1409 * the MDS revokes Fwb caps before sending truncate
1410 * message to us. We can't get Fwb cap while there
1411 * are pending vmtruncate. So write and vmtruncate
1412 * can not run at the same time
1413 */
1414 written = generic_perform_write(file, from, pos);
1415 if (likely(written >= 0))
1416 iocb->ki_pos = pos + written;
1417 inode_unlock(inode);
1418 }
1419
1420 if (written >= 0) {
1421 int dirty;
1422 spin_lock(&ci->i_ceph_lock);
1423 ci->i_inline_version = CEPH_INLINE_NONE;
1424 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
1425 &prealloc_cf);
1426 spin_unlock(&ci->i_ceph_lock);
1427 if (dirty)
1428 __mark_inode_dirty(inode, dirty);
1429 }
1430
1431 dout("aio_write %p %llx.%llx %llu~%u dropping cap refs on %s\n",
1432 inode, ceph_vinop(inode), pos, (unsigned)count,
1433 ceph_cap_string(got));
1434 ceph_put_cap_refs(ci, got);
1435
1436 if (written == -EOLDSNAPC) {
1437 dout("aio_write %p %llx.%llx %llu~%u" "got EOLDSNAPC, retrying\n",
1438 inode, ceph_vinop(inode), pos, (unsigned)count);
1439 goto retry_snap;
1440 }
1441
1442 if (written >= 0) {
1443 if (ceph_osdmap_flag(osdc, CEPH_OSDMAP_NEARFULL))
1444 iocb->ki_flags |= IOCB_DSYNC;
1445 written = generic_write_sync(iocb, written);
1446 }
1447
1448 goto out_unlocked;
1449
1450 out:
1451 inode_unlock(inode);
1452 out_unlocked:
1453 ceph_free_cap_flush(prealloc_cf);
1454 current->backing_dev_info = NULL;
1455 return written ? written : err;
1456 }
1457
1458 /*
1459 * llseek. be sure to verify file size on SEEK_END.
1460 */
1461 static loff_t ceph_llseek(struct file *file, loff_t offset, int whence)
1462 {
1463 struct inode *inode = file->f_mapping->host;
1464 loff_t i_size;
1465 loff_t ret;
1466
1467 inode_lock(inode);
1468
1469 if (whence == SEEK_END || whence == SEEK_DATA || whence == SEEK_HOLE) {
1470 ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false);
1471 if (ret < 0)
1472 goto out;
1473 }
1474
1475 i_size = i_size_read(inode);
1476 switch (whence) {
1477 case SEEK_END:
1478 offset += i_size;
1479 break;
1480 case SEEK_CUR:
1481 /*
1482 * Here we special-case the lseek(fd, 0, SEEK_CUR)
1483 * position-querying operation. Avoid rewriting the "same"
1484 * f_pos value back to the file because a concurrent read(),
1485 * write() or lseek() might have altered it
1486 */
1487 if (offset == 0) {
1488 ret = file->f_pos;
1489 goto out;
1490 }
1491 offset += file->f_pos;
1492 break;
1493 case SEEK_DATA:
1494 if (offset < 0 || offset >= i_size) {
1495 ret = -ENXIO;
1496 goto out;
1497 }
1498 break;
1499 case SEEK_HOLE:
1500 if (offset < 0 || offset >= i_size) {
1501 ret = -ENXIO;
1502 goto out;
1503 }
1504 offset = i_size;
1505 break;
1506 }
1507
1508 ret = vfs_setpos(file, offset, inode->i_sb->s_maxbytes);
1509
1510 out:
1511 inode_unlock(inode);
1512 return ret;
1513 }
1514
1515 static inline void ceph_zero_partial_page(
1516 struct inode *inode, loff_t offset, unsigned size)
1517 {
1518 struct page *page;
1519 pgoff_t index = offset >> PAGE_SHIFT;
1520
1521 page = find_lock_page(inode->i_mapping, index);
1522 if (page) {
1523 wait_on_page_writeback(page);
1524 zero_user(page, offset & (PAGE_SIZE - 1), size);
1525 unlock_page(page);
1526 put_page(page);
1527 }
1528 }
1529
1530 static void ceph_zero_pagecache_range(struct inode *inode, loff_t offset,
1531 loff_t length)
1532 {
1533 loff_t nearly = round_up(offset, PAGE_SIZE);
1534 if (offset < nearly) {
1535 loff_t size = nearly - offset;
1536 if (length < size)
1537 size = length;
1538 ceph_zero_partial_page(inode, offset, size);
1539 offset += size;
1540 length -= size;
1541 }
1542 if (length >= PAGE_SIZE) {
1543 loff_t size = round_down(length, PAGE_SIZE);
1544 truncate_pagecache_range(inode, offset, offset + size - 1);
1545 offset += size;
1546 length -= size;
1547 }
1548 if (length)
1549 ceph_zero_partial_page(inode, offset, length);
1550 }
1551
1552 static int ceph_zero_partial_object(struct inode *inode,
1553 loff_t offset, loff_t *length)
1554 {
1555 struct ceph_inode_info *ci = ceph_inode(inode);
1556 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1557 struct ceph_osd_request *req;
1558 int ret = 0;
1559 loff_t zero = 0;
1560 int op;
1561
1562 if (!length) {
1563 op = offset ? CEPH_OSD_OP_DELETE : CEPH_OSD_OP_TRUNCATE;
1564 length = &zero;
1565 } else {
1566 op = CEPH_OSD_OP_ZERO;
1567 }
1568
1569 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1570 ceph_vino(inode),
1571 offset, length,
1572 0, 1, op,
1573 CEPH_OSD_FLAG_WRITE,
1574 NULL, 0, 0, false);
1575 if (IS_ERR(req)) {
1576 ret = PTR_ERR(req);
1577 goto out;
1578 }
1579
1580 req->r_mtime = inode->i_mtime;
1581 ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
1582 if (!ret) {
1583 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
1584 if (ret == -ENOENT)
1585 ret = 0;
1586 }
1587 ceph_osdc_put_request(req);
1588
1589 out:
1590 return ret;
1591 }
1592
1593 static int ceph_zero_objects(struct inode *inode, loff_t offset, loff_t length)
1594 {
1595 int ret = 0;
1596 struct ceph_inode_info *ci = ceph_inode(inode);
1597 s32 stripe_unit = ci->i_layout.stripe_unit;
1598 s32 stripe_count = ci->i_layout.stripe_count;
1599 s32 object_size = ci->i_layout.object_size;
1600 u64 object_set_size = object_size * stripe_count;
1601 u64 nearly, t;
1602
1603 /* round offset up to next period boundary */
1604 nearly = offset + object_set_size - 1;
1605 t = nearly;
1606 nearly -= do_div(t, object_set_size);
1607
1608 while (length && offset < nearly) {
1609 loff_t size = length;
1610 ret = ceph_zero_partial_object(inode, offset, &size);
1611 if (ret < 0)
1612 return ret;
1613 offset += size;
1614 length -= size;
1615 }
1616 while (length >= object_set_size) {
1617 int i;
1618 loff_t pos = offset;
1619 for (i = 0; i < stripe_count; ++i) {
1620 ret = ceph_zero_partial_object(inode, pos, NULL);
1621 if (ret < 0)
1622 return ret;
1623 pos += stripe_unit;
1624 }
1625 offset += object_set_size;
1626 length -= object_set_size;
1627 }
1628 while (length) {
1629 loff_t size = length;
1630 ret = ceph_zero_partial_object(inode, offset, &size);
1631 if (ret < 0)
1632 return ret;
1633 offset += size;
1634 length -= size;
1635 }
1636 return ret;
1637 }
1638
1639 static long ceph_fallocate(struct file *file, int mode,
1640 loff_t offset, loff_t length)
1641 {
1642 struct ceph_file_info *fi = file->private_data;
1643 struct inode *inode = file_inode(file);
1644 struct ceph_inode_info *ci = ceph_inode(inode);
1645 struct ceph_osd_client *osdc =
1646 &ceph_inode_to_client(inode)->client->osdc;
1647 struct ceph_cap_flush *prealloc_cf;
1648 int want, got = 0;
1649 int dirty;
1650 int ret = 0;
1651 loff_t endoff = 0;
1652 loff_t size;
1653
1654 if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
1655 return -EOPNOTSUPP;
1656
1657 if (!S_ISREG(inode->i_mode))
1658 return -EOPNOTSUPP;
1659
1660 prealloc_cf = ceph_alloc_cap_flush();
1661 if (!prealloc_cf)
1662 return -ENOMEM;
1663
1664 inode_lock(inode);
1665
1666 if (ceph_snap(inode) != CEPH_NOSNAP) {
1667 ret = -EROFS;
1668 goto unlock;
1669 }
1670
1671 if (ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL) &&
1672 !(mode & FALLOC_FL_PUNCH_HOLE)) {
1673 ret = -ENOSPC;
1674 goto unlock;
1675 }
1676
1677 if (ci->i_inline_version != CEPH_INLINE_NONE) {
1678 ret = ceph_uninline_data(file, NULL);
1679 if (ret < 0)
1680 goto unlock;
1681 }
1682
1683 size = i_size_read(inode);
1684 if (!(mode & FALLOC_FL_KEEP_SIZE)) {
1685 endoff = offset + length;
1686 ret = inode_newsize_ok(inode, endoff);
1687 if (ret)
1688 goto unlock;
1689 }
1690
1691 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1692 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
1693 else
1694 want = CEPH_CAP_FILE_BUFFER;
1695
1696 ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, endoff, &got, NULL);
1697 if (ret < 0)
1698 goto unlock;
1699
1700 if (mode & FALLOC_FL_PUNCH_HOLE) {
1701 if (offset < size)
1702 ceph_zero_pagecache_range(inode, offset, length);
1703 ret = ceph_zero_objects(inode, offset, length);
1704 } else if (endoff > size) {
1705 truncate_pagecache_range(inode, size, -1);
1706 if (ceph_inode_set_size(inode, endoff))
1707 ceph_check_caps(ceph_inode(inode),
1708 CHECK_CAPS_AUTHONLY, NULL);
1709 }
1710
1711 if (!ret) {
1712 spin_lock(&ci->i_ceph_lock);
1713 ci->i_inline_version = CEPH_INLINE_NONE;
1714 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
1715 &prealloc_cf);
1716 spin_unlock(&ci->i_ceph_lock);
1717 if (dirty)
1718 __mark_inode_dirty(inode, dirty);
1719 }
1720
1721 ceph_put_cap_refs(ci, got);
1722 unlock:
1723 inode_unlock(inode);
1724 ceph_free_cap_flush(prealloc_cf);
1725 return ret;
1726 }
1727
1728 const struct file_operations ceph_file_fops = {
1729 .open = ceph_open,
1730 .release = ceph_release,
1731 .llseek = ceph_llseek,
1732 .read_iter = ceph_read_iter,
1733 .write_iter = ceph_write_iter,
1734 .mmap = ceph_mmap,
1735 .fsync = ceph_fsync,
1736 .lock = ceph_lock,
1737 .flock = ceph_flock,
1738 .splice_read = generic_file_splice_read,
1739 .splice_write = iter_file_splice_write,
1740 .unlocked_ioctl = ceph_ioctl,
1741 .compat_ioctl = ceph_ioctl,
1742 .fallocate = ceph_fallocate,
1743 };
1744
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