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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 * Ceph file operations
18 *
19 * Implement basic open/close functionality, and implement
20 * read/write.
21 *
22 * We implement three modes of file I/O:
23 * - buffered uses the generic_file_aio_{read,write} helpers
24 *
25 * - synchronous is used when there is multi-client read/write
26 * sharing, avoids the page cache, and synchronously waits for an
27 * ack from the OSD.
28 *
29 * - direct io takes the variant of the sync path that references
30 * user pages directly.
31 *
32 * fsync() flushes and waits on dirty pages, but just queues metadata
33 * for writeback: since the MDS can recover size and mtime there is no
34 * need to wait for MDS acknowledgement.
35 */
36
37/*
38 * Calculate the length sum of direct io vectors that can
39 * be combined into one page vector.
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 * An iov can be page vectored when both the current tail
50 * and the next base are page aligned.
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 * Allocate a page vector based on (@it, @nbytes).
62 * The return value is the tuple describing a page vector,
63 * that is (@pages, @page_align, @num_pages).
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 * Prepare an open request. Preallocate ceph_cap to avoid an
108 * inopportune ENOMEM later.
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 * initialize private struct file data.
134 * if we fail, clean up by dropping fmode reference on the ceph_inode
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); /* clean up */
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); /* clean up */
164 break;
165
166 default:
167 dout("init_file %p %p 0%o (special)\n", inode, file,
168 inode->i_mode);
169 /*
170 * we need to drop the open ref now, since we don't
171 * have .release set to ceph_release.
172 */
173 ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */
174 BUG_ON(inode->i_fop->release == ceph_release);
175
176 /* call the proper open fop */
177 ret = inode->i_fop->open(inode, file);
178 }
179 return ret;
180}
181
182/*
183 * try renew caps after session gets killed.
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 * If we already have the requisite capabilities, we can satisfy
237 * the open request locally (no need to request new caps from the
238 * MDS). We do, however, need to inform the MDS (asynchronously)
239 * if our wanted caps set expands.
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 /* filter out O_CREAT|O_EXCL; vfs did that already. yuck. */
257 flags = file->f_flags & ~(O_CREAT|O_EXCL);
258 if (S_ISDIR(inode->i_mode))
259 flags = O_DIRECTORY; /* mds likes to know */
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 /* snapped files are read-only */
267 if (ceph_snap(inode) != CEPH_NOSNAP && (file->f_mode & FMODE_WRITE))
268 return -EROFS;
269
270 /* trivially open snapdir */
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 * No need to block if we have caps on the auth MDS (for
280 * write) or any MDS (for read). Update wanted set
281 * asynchronously.
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 /* adjust wanted? */
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 * Do a lookup + open with a single request. If we get a non-existent
333 * file or symlink, return 1 so the VFS can retry.
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 if (flags & O_CREAT) {
355 err = ceph_pre_init_acls(dir, &mode, &acls);
356 if (err < 0)
357 return err;
358 }
359
360 /* do the open */
361 req = prepare_open_request(dir->i_sb, flags, mode);
362 if (IS_ERR(req)) {
363 err = PTR_ERR(req);
364 goto out_acl;
365 }
366 req->r_dentry = dget(dentry);
367 req->r_num_caps = 2;
368 if (flags & O_CREAT) {
369 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
370 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
371 if (acls.pagelist) {
372 req->r_pagelist = acls.pagelist;
373 acls.pagelist = NULL;
374 }
375 }
376
377 mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED;
378 if (ceph_security_xattr_wanted(dir))
379 mask |= CEPH_CAP_XATTR_SHARED;
380 req->r_args.open.mask = cpu_to_le32(mask);
381
382 req->r_locked_dir = dir; /* caller holds dir->i_mutex */
383 err = ceph_mdsc_do_request(mdsc,
384 (flags & (O_CREAT|O_TRUNC)) ? dir : NULL,
385 req);
386 err = ceph_handle_snapdir(req, dentry, err);
387 if (err)
388 goto out_req;
389
390 if ((flags & O_CREAT) && !req->r_reply_info.head->is_dentry)
391 err = ceph_handle_notrace_create(dir, dentry);
392
393 if (d_in_lookup(dentry)) {
394 dn = ceph_finish_lookup(req, dentry, err);
395 if (IS_ERR(dn))
396 err = PTR_ERR(dn);
397 } else {
398 /* we were given a hashed negative dentry */
399 dn = NULL;
400 }
401 if (err)
402 goto out_req;
403 if (dn || d_really_is_negative(dentry) || d_is_symlink(dentry)) {
404 /* make vfs retry on splice, ENOENT, or symlink */
405 dout("atomic_open finish_no_open on dn %p\n", dn);
406 err = finish_no_open(file, dn);
407 } else {
408 dout("atomic_open finish_open on dn %p\n", dn);
409 if (req->r_op == CEPH_MDS_OP_CREATE && req->r_reply_info.has_create_ino) {
410 ceph_init_inode_acls(d_inode(dentry), &acls);
411 *opened |= FILE_CREATED;
412 }
413 err = finish_open(file, dentry, ceph_open, opened);
414 }
415out_req:
416 if (!req->r_err && req->r_target_inode)
417 ceph_put_fmode(ceph_inode(req->r_target_inode), req->r_fmode);
418 ceph_mdsc_put_request(req);
419out_acl:
420 ceph_release_acls_info(&acls);
421 dout("atomic_open result=%d\n", err);
422 return err;
423}
424
425int ceph_release(struct inode *inode, struct file *file)
426{
427 struct ceph_inode_info *ci = ceph_inode(inode);
428 struct ceph_file_info *cf = file->private_data;
429
430 dout("release inode %p file %p\n", inode, file);
431 ceph_put_fmode(ci, cf->fmode);
432 if (cf->last_readdir)
433 ceph_mdsc_put_request(cf->last_readdir);
434 kfree(cf->last_name);
435 kfree(cf->dir_info);
436 kmem_cache_free(ceph_file_cachep, cf);
437
438 /* wake up anyone waiting for caps on this inode */
439 wake_up_all(&ci->i_cap_wq);
440 return 0;
441}
442
443enum {
444 HAVE_RETRIED = 1,
445 CHECK_EOF = 2,
446 READ_INLINE = 3,
447};
448
449/*
450 * Read a range of bytes striped over one or more objects. Iterate over
451 * objects we stripe over. (That's not atomic, but good enough for now.)
452 *
453 * If we get a short result from the OSD, check against i_size; we need to
454 * only return a short read to the caller if we hit EOF.
455 */
456static int striped_read(struct inode *inode,
457 u64 pos, u64 len,
458 struct page **pages, int num_pages,
459 int page_align, int *checkeof)
460{
461 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
462 struct ceph_inode_info *ci = ceph_inode(inode);
463 u64 this_len;
464 loff_t i_size;
465 int page_idx;
466 int ret, read = 0;
467 bool hit_stripe, was_short;
468
469 /*
470 * we may need to do multiple reads. not atomic, unfortunately.
471 */
472more:
473 this_len = len;
474 page_idx = (page_align + read) >> PAGE_SHIFT;
475 ret = ceph_osdc_readpages(&fsc->client->osdc, ceph_vino(inode),
476 &ci->i_layout, pos, &this_len,
477 ci->i_truncate_seq, ci->i_truncate_size,
478 pages + page_idx, num_pages - page_idx,
479 ((page_align + read) & ~PAGE_MASK));
480 if (ret == -ENOENT)
481 ret = 0;
482 hit_stripe = this_len < len;
483 was_short = ret >= 0 && ret < this_len;
484 dout("striped_read %llu~%llu (read %u) got %d%s%s\n", pos, len, read,
485 ret, hit_stripe ? " HITSTRIPE" : "", was_short ? " SHORT" : "");
486
487 i_size = i_size_read(inode);
488 if (ret >= 0) {
489 if (was_short && (pos + ret < i_size)) {
490 int zlen = min(this_len - ret, i_size - pos - ret);
491 int zoff = page_align + read + ret;
492 dout(" zero gap %llu to %llu\n",
493 pos + ret, pos + ret + zlen);
494 ceph_zero_page_vector_range(zoff, zlen, pages);
495 ret += zlen;
496 }
497
498 read += ret;
499 pos += ret;
500 len -= ret;
501
502 /* hit stripe and need continue*/
503 if (len && hit_stripe && pos < i_size)
504 goto more;
505 }
506
507 if (read > 0) {
508 ret = read;
509 /* did we bounce off eof? */
510 if (pos + len > i_size)
511 *checkeof = CHECK_EOF;
512 }
513
514 dout("striped_read returns %d\n", ret);
515 return ret;
516}
517
518/*
519 * Completely synchronous read and write methods. Direct from __user
520 * buffer to osd, or directly to user pages (if O_DIRECT).
521 *
522 * If the read spans object boundary, just do multiple reads.
523 */
524static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *to,
525 int *checkeof)
526{
527 struct file *file = iocb->ki_filp;
528 struct inode *inode = file_inode(file);
529 struct page **pages;
530 u64 off = iocb->ki_pos;
531 int num_pages;
532 ssize_t ret;
533 size_t len = iov_iter_count(to);
534
535 dout("sync_read on file %p %llu~%u %s\n", file, off,
536 (unsigned)len,
537 (file->f_flags & O_DIRECT) ? "O_DIRECT" : "");
538
539 if (!len)
540 return 0;
541 /*
542 * flush any page cache pages in this range. this
543 * will make concurrent normal and sync io slow,
544 * but it will at least behave sensibly when they are
545 * in sequence.
546 */
547 ret = filemap_write_and_wait_range(inode->i_mapping, off,
548 off + len);
549 if (ret < 0)
550 return ret;
551
552 if (unlikely(to->type & ITER_PIPE)) {
553 size_t page_off;
554 ret = iov_iter_get_pages_alloc(to, &pages, len,
555 &page_off);
556 if (ret <= 0)
557 return -ENOMEM;
558 num_pages = DIV_ROUND_UP(ret + page_off, PAGE_SIZE);
559
560 ret = striped_read(inode, off, ret, pages, num_pages,
561 page_off, checkeof);
562 if (ret > 0) {
563 iov_iter_advance(to, ret);
564 off += ret;
565 } else {
566 iov_iter_advance(to, 0);
567 }
568 ceph_put_page_vector(pages, num_pages, false);
569 } else {
570 num_pages = calc_pages_for(off, len);
571 pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL);
572 if (IS_ERR(pages))
573 return PTR_ERR(pages);
574
575 ret = striped_read(inode, off, len, pages, num_pages,
576 (off & ~PAGE_MASK), checkeof);
577 if (ret > 0) {
578 int l, k = 0;
579 size_t left = ret;
580
581 while (left) {
582 size_t page_off = off & ~PAGE_MASK;
583 size_t copy = min_t(size_t, left,
584 PAGE_SIZE - page_off);
585 l = copy_page_to_iter(pages[k++], page_off,
586 copy, to);
587 off += l;
588 left -= l;
589 if (l < copy)
590 break;
591 }
592 }
593 ceph_release_page_vector(pages, num_pages);
594 }
595
596 if (off > iocb->ki_pos) {
597 ret = off - iocb->ki_pos;
598 iocb->ki_pos = off;
599 }
600
601 dout("sync_read result %zd\n", ret);
602 return ret;
603}
604
605struct ceph_aio_request {
606 struct kiocb *iocb;
607 size_t total_len;
608 int write;
609 int error;
610 struct list_head osd_reqs;
611 unsigned num_reqs;
612 atomic_t pending_reqs;
613 struct timespec mtime;
614 struct ceph_cap_flush *prealloc_cf;
615};
616
617struct ceph_aio_work {
618 struct work_struct work;
619 struct ceph_osd_request *req;
620};
621
622static void ceph_aio_retry_work(struct work_struct *work);
623
624static void ceph_aio_complete(struct inode *inode,
625 struct ceph_aio_request *aio_req)
626{
627 struct ceph_inode_info *ci = ceph_inode(inode);
628 int ret;
629
630 if (!atomic_dec_and_test(&aio_req->pending_reqs))
631 return;
632
633 ret = aio_req->error;
634 if (!ret)
635 ret = aio_req->total_len;
636
637 dout("ceph_aio_complete %p rc %d\n", inode, ret);
638
639 if (ret >= 0 && aio_req->write) {
640 int dirty;
641
642 loff_t endoff = aio_req->iocb->ki_pos + aio_req->total_len;
643 if (endoff > i_size_read(inode)) {
644 if (ceph_inode_set_size(inode, endoff))
645 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
646 }
647
648 spin_lock(&ci->i_ceph_lock);
649 ci->i_inline_version = CEPH_INLINE_NONE;
650 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
651 &aio_req->prealloc_cf);
652 spin_unlock(&ci->i_ceph_lock);
653 if (dirty)
654 __mark_inode_dirty(inode, dirty);
655
656 }
657
658 ceph_put_cap_refs(ci, (aio_req->write ? CEPH_CAP_FILE_WR :
659 CEPH_CAP_FILE_RD));
660
661 aio_req->iocb->ki_complete(aio_req->iocb, ret, 0);
662
663 ceph_free_cap_flush(aio_req->prealloc_cf);
664 kfree(aio_req);
665}
666
667static void ceph_aio_complete_req(struct ceph_osd_request *req)
668{
669 int rc = req->r_result;
670 struct inode *inode = req->r_inode;
671 struct ceph_aio_request *aio_req = req->r_priv;
672 struct ceph_osd_data *osd_data = osd_req_op_extent_osd_data(req, 0);
673 int num_pages = calc_pages_for((u64)osd_data->alignment,
674 osd_data->length);
675
676 dout("ceph_aio_complete_req %p rc %d bytes %llu\n",
677 inode, rc, osd_data->length);
678
679 if (rc == -EOLDSNAPC) {
680 struct ceph_aio_work *aio_work;
681 BUG_ON(!aio_req->write);
682
683 aio_work = kmalloc(sizeof(*aio_work), GFP_NOFS);
684 if (aio_work) {
685 INIT_WORK(&aio_work->work, ceph_aio_retry_work);
686 aio_work->req = req;
687 queue_work(ceph_inode_to_client(inode)->wb_wq,
688 &aio_work->work);
689 return;
690 }
691 rc = -ENOMEM;
692 } else if (!aio_req->write) {
693 if (rc == -ENOENT)
694 rc = 0;
695 if (rc >= 0 && osd_data->length > rc) {
696 int zoff = osd_data->alignment + rc;
697 int zlen = osd_data->length - rc;
698 /*
699 * If read is satisfied by single OSD request,
700 * it can pass EOF. Otherwise read is within
701 * i_size.
702 */
703 if (aio_req->num_reqs == 1) {
704 loff_t i_size = i_size_read(inode);
705 loff_t endoff = aio_req->iocb->ki_pos + rc;
706 if (endoff < i_size)
707 zlen = min_t(size_t, zlen,
708 i_size - endoff);
709 aio_req->total_len = rc + zlen;
710 }
711
712 if (zlen > 0)
713 ceph_zero_page_vector_range(zoff, zlen,
714 osd_data->pages);
715 }
716 }
717
718 ceph_put_page_vector(osd_data->pages, num_pages, !aio_req->write);
719 ceph_osdc_put_request(req);
720
721 if (rc < 0)
722 cmpxchg(&aio_req->error, 0, rc);
723
724 ceph_aio_complete(inode, aio_req);
725 return;
726}
727
728static void ceph_aio_retry_work(struct work_struct *work)
729{
730 struct ceph_aio_work *aio_work =
731 container_of(work, struct ceph_aio_work, work);
732 struct ceph_osd_request *orig_req = aio_work->req;
733 struct ceph_aio_request *aio_req = orig_req->r_priv;
734 struct inode *inode = orig_req->r_inode;
735 struct ceph_inode_info *ci = ceph_inode(inode);
736 struct ceph_snap_context *snapc;
737 struct ceph_osd_request *req;
738 int ret;
739
740 spin_lock(&ci->i_ceph_lock);
741 if (__ceph_have_pending_cap_snap(ci)) {
742 struct ceph_cap_snap *capsnap =
743 list_last_entry(&ci->i_cap_snaps,
744 struct ceph_cap_snap,
745 ci_item);
746 snapc = ceph_get_snap_context(capsnap->context);
747 } else {
748 BUG_ON(!ci->i_head_snapc);
749 snapc = ceph_get_snap_context(ci->i_head_snapc);
750 }
751 spin_unlock(&ci->i_ceph_lock);
752
753 req = ceph_osdc_alloc_request(orig_req->r_osdc, snapc, 2,
754 false, GFP_NOFS);
755 if (!req) {
756 ret = -ENOMEM;
757 req = orig_req;
758 goto out;
759 }
760
761 req->r_flags = CEPH_OSD_FLAG_ORDERSNAP |
762 CEPH_OSD_FLAG_ONDISK |
763 CEPH_OSD_FLAG_WRITE;
764 ceph_oloc_copy(&req->r_base_oloc, &orig_req->r_base_oloc);
765 ceph_oid_copy(&req->r_base_oid, &orig_req->r_base_oid);
766
767 ret = ceph_osdc_alloc_messages(req, GFP_NOFS);
768 if (ret) {
769 ceph_osdc_put_request(req);
770 req = orig_req;
771 goto out;
772 }
773
774 req->r_ops[0] = orig_req->r_ops[0];
775 osd_req_op_init(req, 1, CEPH_OSD_OP_STARTSYNC, 0);
776
777 req->r_mtime = aio_req->mtime;
778 req->r_data_offset = req->r_ops[0].extent.offset;
779
780 ceph_osdc_put_request(orig_req);
781
782 req->r_callback = ceph_aio_complete_req;
783 req->r_inode = inode;
784 req->r_priv = aio_req;
785
786 ret = ceph_osdc_start_request(req->r_osdc, req, false);
787out:
788 if (ret < 0) {
789 req->r_result = ret;
790 ceph_aio_complete_req(req);
791 }
792
793 ceph_put_snap_context(snapc);
794 kfree(aio_work);
795}
796
797/*
798 * Write commit request unsafe callback, called to tell us when a
799 * request is unsafe (that is, in flight--has been handed to the
800 * messenger to send to its target osd). It is called again when
801 * we've received a response message indicating the request is
802 * "safe" (its CEPH_OSD_FLAG_ONDISK flag is set), or when a request
803 * is completed early (and unsuccessfully) due to a timeout or
804 * interrupt.
805 *
806 * This is used if we requested both an ACK and ONDISK commit reply
807 * from the OSD.
808 */
809static void ceph_sync_write_unsafe(struct ceph_osd_request *req, bool unsafe)
810{
811 struct ceph_inode_info *ci = ceph_inode(req->r_inode);
812
813 dout("%s %p tid %llu %ssafe\n", __func__, req, req->r_tid,
814 unsafe ? "un" : "");
815 if (unsafe) {
816 ceph_get_cap_refs(ci, CEPH_CAP_FILE_WR);
817 spin_lock(&ci->i_unsafe_lock);
818 list_add_tail(&req->r_unsafe_item,
819 &ci->i_unsafe_writes);
820 spin_unlock(&ci->i_unsafe_lock);
821
822 complete_all(&req->r_completion);
823 } else {
824 spin_lock(&ci->i_unsafe_lock);
825 list_del_init(&req->r_unsafe_item);
826 spin_unlock(&ci->i_unsafe_lock);
827 ceph_put_cap_refs(ci, CEPH_CAP_FILE_WR);
828 }
829}
830
831/*
832 * Wait on any unsafe replies for the given inode. First wait on the
833 * newest request, and make that the upper bound. Then, if there are
834 * more requests, keep waiting on the oldest as long as it is still older
835 * than the original request.
836 */
837void ceph_sync_write_wait(struct inode *inode)
838{
839 struct ceph_inode_info *ci = ceph_inode(inode);
840 struct list_head *head = &ci->i_unsafe_writes;
841 struct ceph_osd_request *req;
842 u64 last_tid;
843
844 if (!S_ISREG(inode->i_mode))
845 return;
846
847 spin_lock(&ci->i_unsafe_lock);
848 if (list_empty(head))
849 goto out;
850
851 /* set upper bound as _last_ entry in chain */
852
853 req = list_last_entry(head, struct ceph_osd_request,
854 r_unsafe_item);
855 last_tid = req->r_tid;
856
857 do {
858 ceph_osdc_get_request(req);
859 spin_unlock(&ci->i_unsafe_lock);
860
861 dout("sync_write_wait on tid %llu (until %llu)\n",
862 req->r_tid, last_tid);
863 wait_for_completion(&req->r_done_completion);
864 ceph_osdc_put_request(req);
865
866 spin_lock(&ci->i_unsafe_lock);
867 /*
868 * from here on look at first entry in chain, since we
869 * only want to wait for anything older than last_tid
870 */
871 if (list_empty(head))
872 break;
873 req = list_first_entry(head, struct ceph_osd_request,
874 r_unsafe_item);
875 } while (req->r_tid < last_tid);
876out:
877 spin_unlock(&ci->i_unsafe_lock);
878}
879
880static ssize_t
881ceph_direct_read_write(struct kiocb *iocb, struct iov_iter *iter,
882 struct ceph_snap_context *snapc,
883 struct ceph_cap_flush **pcf)
884{
885 struct file *file = iocb->ki_filp;
886 struct inode *inode = file_inode(file);
887 struct ceph_inode_info *ci = ceph_inode(inode);
888 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
889 struct ceph_vino vino;
890 struct ceph_osd_request *req;
891 struct page **pages;
892 struct ceph_aio_request *aio_req = NULL;
893 int num_pages = 0;
894 int flags;
895 int ret;
896 struct timespec mtime = current_time(inode);
897 size_t count = iov_iter_count(iter);
898 loff_t pos = iocb->ki_pos;
899 bool write = iov_iter_rw(iter) == WRITE;
900
901 if (write && ceph_snap(file_inode(file)) != CEPH_NOSNAP)
902 return -EROFS;
903
904 dout("sync_direct_read_write (%s) on file %p %lld~%u\n",
905 (write ? "write" : "read"), file, pos, (unsigned)count);
906
907 ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + count);
908 if (ret < 0)
909 return ret;
910
911 if (write) {
912 int ret2 = invalidate_inode_pages2_range(inode->i_mapping,
913 pos >> PAGE_SHIFT,
914 (pos + count) >> PAGE_SHIFT);
915 if (ret2 < 0)
916 dout("invalidate_inode_pages2_range returned %d\n", ret2);
917
918 flags = CEPH_OSD_FLAG_ORDERSNAP |
919 CEPH_OSD_FLAG_ONDISK |
920 CEPH_OSD_FLAG_WRITE;
921 } else {
922 flags = CEPH_OSD_FLAG_READ;
923 }
924
925 while (iov_iter_count(iter) > 0) {
926 u64 size = dio_get_pagev_size(iter);
927 size_t start = 0;
928 ssize_t len;
929
930 vino = ceph_vino(inode);
931 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
932 vino, pos, &size, 0,
933 /*include a 'startsync' command*/
934 write ? 2 : 1,
935 write ? CEPH_OSD_OP_WRITE :
936 CEPH_OSD_OP_READ,
937 flags, snapc,
938 ci->i_truncate_seq,
939 ci->i_truncate_size,
940 false);
941 if (IS_ERR(req)) {
942 ret = PTR_ERR(req);
943 break;
944 }
945
946 len = size;
947 pages = dio_get_pages_alloc(iter, len, &start, &num_pages);
948 if (IS_ERR(pages)) {
949 ceph_osdc_put_request(req);
950 ret = PTR_ERR(pages);
951 break;
952 }
953
954 /*
955 * To simplify error handling, allow AIO when IO within i_size
956 * or IO can be satisfied by single OSD request.
957 */
958 if (pos == iocb->ki_pos && !is_sync_kiocb(iocb) &&
959 (len == count || pos + count <= i_size_read(inode))) {
960 aio_req = kzalloc(sizeof(*aio_req), GFP_KERNEL);
961 if (aio_req) {
962 aio_req->iocb = iocb;
963 aio_req->write = write;
964 INIT_LIST_HEAD(&aio_req->osd_reqs);
965 if (write) {
966 aio_req->mtime = mtime;
967 swap(aio_req->prealloc_cf, *pcf);
968 }
969 }
970 /* ignore error */
971 }
972
973 if (write) {
974 /*
975 * throw out any page cache pages in this range. this
976 * may block.
977 */
978 truncate_inode_pages_range(inode->i_mapping, pos,
979 (pos+len) | (PAGE_SIZE - 1));
980
981 osd_req_op_init(req, 1, CEPH_OSD_OP_STARTSYNC, 0);
982 req->r_mtime = mtime;
983 }
984
985 osd_req_op_extent_osd_data_pages(req, 0, pages, len, start,
986 false, false);
987
988 if (aio_req) {
989 aio_req->total_len += len;
990 aio_req->num_reqs++;
991 atomic_inc(&aio_req->pending_reqs);
992
993 req->r_callback = ceph_aio_complete_req;
994 req->r_inode = inode;
995 req->r_priv = aio_req;
996 list_add_tail(&req->r_unsafe_item, &aio_req->osd_reqs);
997
998 pos += len;
999 iov_iter_advance(iter, len);
1000 continue;
1001 }
1002
1003 ret = ceph_osdc_start_request(req->r_osdc, req, false);
1004 if (!ret)
1005 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
1006
1007 size = i_size_read(inode);
1008 if (!write) {
1009 if (ret == -ENOENT)
1010 ret = 0;
1011 if (ret >= 0 && ret < len && pos + ret < size) {
1012 int zlen = min_t(size_t, len - ret,
1013 size - pos - ret);
1014 ceph_zero_page_vector_range(start + ret, zlen,
1015 pages);
1016 ret += zlen;
1017 }
1018 if (ret >= 0)
1019 len = ret;
1020 }
1021
1022 ceph_put_page_vector(pages, num_pages, !write);
1023
1024 ceph_osdc_put_request(req);
1025 if (ret < 0)
1026 break;
1027
1028 pos += len;
1029 iov_iter_advance(iter, len);
1030
1031 if (!write && pos >= size)
1032 break;
1033
1034 if (write && pos > size) {
1035 if (ceph_inode_set_size(inode, pos))
1036 ceph_check_caps(ceph_inode(inode),
1037 CHECK_CAPS_AUTHONLY,
1038 NULL);
1039 }
1040 }
1041
1042 if (aio_req) {
1043 LIST_HEAD(osd_reqs);
1044
1045 if (aio_req->num_reqs == 0) {
1046 kfree(aio_req);
1047 return ret;
1048 }
1049
1050 ceph_get_cap_refs(ci, write ? CEPH_CAP_FILE_WR :
1051 CEPH_CAP_FILE_RD);
1052
1053 list_splice(&aio_req->osd_reqs, &osd_reqs);
1054 while (!list_empty(&osd_reqs)) {
1055 req = list_first_entry(&osd_reqs,
1056 struct ceph_osd_request,
1057 r_unsafe_item);
1058 list_del_init(&req->r_unsafe_item);
1059 if (ret >= 0)
1060 ret = ceph_osdc_start_request(req->r_osdc,
1061 req, false);
1062 if (ret < 0) {
1063 req->r_result = ret;
1064 ceph_aio_complete_req(req);
1065 }
1066 }
1067 return -EIOCBQUEUED;
1068 }
1069
1070 if (ret != -EOLDSNAPC && pos > iocb->ki_pos) {
1071 ret = pos - iocb->ki_pos;
1072 iocb->ki_pos = pos;
1073 }
1074 return ret;
1075}
1076
1077/*
1078 * Synchronous write, straight from __user pointer or user pages.
1079 *
1080 * If write spans object boundary, just do multiple writes. (For a
1081 * correct atomic write, we should e.g. take write locks on all
1082 * objects, rollback on failure, etc.)
1083 */
1084static ssize_t
1085ceph_sync_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos,
1086 struct ceph_snap_context *snapc)
1087{
1088 struct file *file = iocb->ki_filp;
1089 struct inode *inode = file_inode(file);
1090 struct ceph_inode_info *ci = ceph_inode(inode);
1091 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1092 struct ceph_vino vino;
1093 struct ceph_osd_request *req;
1094 struct page **pages;
1095 u64 len;
1096 int num_pages;
1097 int written = 0;
1098 int flags;
1099 int check_caps = 0;
1100 int ret;
1101 struct timespec mtime = current_time(inode);
1102 size_t count = iov_iter_count(from);
1103
1104 if (ceph_snap(file_inode(file)) != CEPH_NOSNAP)
1105 return -EROFS;
1106
1107 dout("sync_write on file %p %lld~%u\n", file, pos, (unsigned)count);
1108
1109 ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + count);
1110 if (ret < 0)
1111 return ret;
1112
1113 ret = invalidate_inode_pages2_range(inode->i_mapping,
1114 pos >> PAGE_SHIFT,
1115 (pos + count) >> PAGE_SHIFT);
1116 if (ret < 0)
1117 dout("invalidate_inode_pages2_range returned %d\n", ret);
1118
1119 flags = CEPH_OSD_FLAG_ORDERSNAP |
1120 CEPH_OSD_FLAG_ONDISK |
1121 CEPH_OSD_FLAG_WRITE |
1122 CEPH_OSD_FLAG_ACK;
1123
1124 while ((len = iov_iter_count(from)) > 0) {
1125 size_t left;
1126 int n;
1127
1128 vino = ceph_vino(inode);
1129 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1130 vino, pos, &len, 0, 1,
1131 CEPH_OSD_OP_WRITE, flags, snapc,
1132 ci->i_truncate_seq,
1133 ci->i_truncate_size,
1134 false);
1135 if (IS_ERR(req)) {
1136 ret = PTR_ERR(req);
1137 break;
1138 }
1139
1140 /*
1141 * write from beginning of first page,
1142 * regardless of io alignment
1143 */
1144 num_pages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
1145
1146 pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL);
1147 if (IS_ERR(pages)) {
1148 ret = PTR_ERR(pages);
1149 goto out;
1150 }
1151
1152 left = len;
1153 for (n = 0; n < num_pages; n++) {
1154 size_t plen = min_t(size_t, left, PAGE_SIZE);
1155 ret = copy_page_from_iter(pages[n], 0, plen, from);
1156 if (ret != plen) {
1157 ret = -EFAULT;
1158 break;
1159 }
1160 left -= ret;
1161 }
1162
1163 if (ret < 0) {
1164 ceph_release_page_vector(pages, num_pages);
1165 goto out;
1166 }
1167
1168 /* get a second commit callback */
1169 req->r_unsafe_callback = ceph_sync_write_unsafe;
1170 req->r_inode = inode;
1171
1172 osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0,
1173 false, true);
1174
1175 req->r_mtime = mtime;
1176 ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
1177 if (!ret)
1178 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
1179
1180out:
1181 ceph_osdc_put_request(req);
1182 if (ret == 0) {
1183 pos += len;
1184 written += len;
1185
1186 if (pos > i_size_read(inode)) {
1187 check_caps = ceph_inode_set_size(inode, pos);
1188 if (check_caps)
1189 ceph_check_caps(ceph_inode(inode),
1190 CHECK_CAPS_AUTHONLY,
1191 NULL);
1192 }
1193 } else
1194 break;
1195 }
1196
1197 if (ret != -EOLDSNAPC && written > 0) {
1198 ret = written;
1199 iocb->ki_pos = pos;
1200 }
1201 return ret;
1202}
1203
1204/*
1205 * Wrap generic_file_aio_read with checks for cap bits on the inode.
1206 * Atomically grab references, so that those bits are not released
1207 * back to the MDS mid-read.
1208 *
1209 * Hmm, the sync read case isn't actually async... should it be?
1210 */
1211static ssize_t ceph_read_iter(struct kiocb *iocb, struct iov_iter *to)
1212{
1213 struct file *filp = iocb->ki_filp;
1214 struct ceph_file_info *fi = filp->private_data;
1215 size_t len = iov_iter_count(to);
1216 struct inode *inode = file_inode(filp);
1217 struct ceph_inode_info *ci = ceph_inode(inode);
1218 struct page *pinned_page = NULL;
1219 ssize_t ret;
1220 int want, got = 0;
1221 int retry_op = 0, read = 0;
1222
1223again:
1224 dout("aio_read %p %llx.%llx %llu~%u trying to get caps on %p\n",
1225 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len, inode);
1226
1227 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1228 want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
1229 else
1230 want = CEPH_CAP_FILE_CACHE;
1231 ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, -1, &got, &pinned_page);
1232 if (ret < 0)
1233 return ret;
1234
1235 if ((got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0 ||
1236 (iocb->ki_flags & IOCB_DIRECT) ||
1237 (fi->flags & CEPH_F_SYNC)) {
1238
1239 dout("aio_sync_read %p %llx.%llx %llu~%u got cap refs on %s\n",
1240 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
1241 ceph_cap_string(got));
1242
1243 if (ci->i_inline_version == CEPH_INLINE_NONE) {
1244 if (!retry_op && (iocb->ki_flags & IOCB_DIRECT)) {
1245 ret = ceph_direct_read_write(iocb, to,
1246 NULL, NULL);
1247 if (ret >= 0 && ret < len)
1248 retry_op = CHECK_EOF;
1249 } else {
1250 ret = ceph_sync_read(iocb, to, &retry_op);
1251 }
1252 } else {
1253 retry_op = READ_INLINE;
1254 }
1255 } else {
1256 dout("aio_read %p %llx.%llx %llu~%u got cap refs on %s\n",
1257 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
1258 ceph_cap_string(got));
1259 current->journal_info = filp;
1260 ret = generic_file_read_iter(iocb, to);
1261 current->journal_info = NULL;
1262 }
1263 dout("aio_read %p %llx.%llx dropping cap refs on %s = %d\n",
1264 inode, ceph_vinop(inode), ceph_cap_string(got), (int)ret);
1265 if (pinned_page) {
1266 put_page(pinned_page);
1267 pinned_page = NULL;
1268 }
1269 ceph_put_cap_refs(ci, got);
1270 if (retry_op > HAVE_RETRIED && ret >= 0) {
1271 int statret;
1272 struct page *page = NULL;
1273 loff_t i_size;
1274 if (retry_op == READ_INLINE) {
1275 page = __page_cache_alloc(GFP_KERNEL);
1276 if (!page)
1277 return -ENOMEM;
1278 }
1279
1280 statret = __ceph_do_getattr(inode, page,
1281 CEPH_STAT_CAP_INLINE_DATA, !!page);
1282 if (statret < 0) {
1283 if (page)
1284 __free_page(page);
1285 if (statret == -ENODATA) {
1286 BUG_ON(retry_op != READ_INLINE);
1287 goto again;
1288 }
1289 return statret;
1290 }
1291
1292 i_size = i_size_read(inode);
1293 if (retry_op == READ_INLINE) {
1294 BUG_ON(ret > 0 || read > 0);
1295 if (iocb->ki_pos < i_size &&
1296 iocb->ki_pos < PAGE_SIZE) {
1297 loff_t end = min_t(loff_t, i_size,
1298 iocb->ki_pos + len);
1299 end = min_t(loff_t, end, PAGE_SIZE);
1300 if (statret < end)
1301 zero_user_segment(page, statret, end);
1302 ret = copy_page_to_iter(page,
1303 iocb->ki_pos & ~PAGE_MASK,
1304 end - iocb->ki_pos, to);
1305 iocb->ki_pos += ret;
1306 read += ret;
1307 }
1308 if (iocb->ki_pos < i_size && read < len) {
1309 size_t zlen = min_t(size_t, len - read,
1310 i_size - iocb->ki_pos);
1311 ret = iov_iter_zero(zlen, to);
1312 iocb->ki_pos += ret;
1313 read += ret;
1314 }
1315 __free_pages(page, 0);
1316 return read;
1317 }
1318
1319 /* hit EOF or hole? */
1320 if (retry_op == CHECK_EOF && iocb->ki_pos < i_size &&
1321 ret < len) {
1322 dout("sync_read hit hole, ppos %lld < size %lld"
1323 ", reading more\n", iocb->ki_pos, i_size);
1324
1325 read += ret;
1326 len -= ret;
1327 retry_op = HAVE_RETRIED;
1328 goto again;
1329 }
1330 }
1331
1332 if (ret >= 0)
1333 ret += read;
1334
1335 return ret;
1336}
1337
1338/*
1339 * Take cap references to avoid releasing caps to MDS mid-write.
1340 *
1341 * If we are synchronous, and write with an old snap context, the OSD
1342 * may return EOLDSNAPC. In that case, retry the write.. _after_
1343 * dropping our cap refs and allowing the pending snap to logically
1344 * complete _before_ this write occurs.
1345 *
1346 * If we are near ENOSPC, write synchronously.
1347 */
1348static ssize_t ceph_write_iter(struct kiocb *iocb, struct iov_iter *from)
1349{
1350 struct file *file = iocb->ki_filp;
1351 struct ceph_file_info *fi = file->private_data;
1352 struct inode *inode = file_inode(file);
1353 struct ceph_inode_info *ci = ceph_inode(inode);
1354 struct ceph_osd_client *osdc =
1355 &ceph_sb_to_client(inode->i_sb)->client->osdc;
1356 struct ceph_cap_flush *prealloc_cf;
1357 ssize_t count, written = 0;
1358 int err, want, got;
1359 loff_t pos;
1360
1361 if (ceph_snap(inode) != CEPH_NOSNAP)
1362 return -EROFS;
1363
1364 prealloc_cf = ceph_alloc_cap_flush();
1365 if (!prealloc_cf)
1366 return -ENOMEM;
1367
1368 inode_lock(inode);
1369
1370 /* We can write back this queue in page reclaim */
1371 current->backing_dev_info = inode_to_bdi(inode);
1372
1373 if (iocb->ki_flags & IOCB_APPEND) {
1374 err = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false);
1375 if (err < 0)
1376 goto out;
1377 }
1378
1379 err = generic_write_checks(iocb, from);
1380 if (err <= 0)
1381 goto out;
1382
1383 pos = iocb->ki_pos;
1384 count = iov_iter_count(from);
1385 err = file_remove_privs(file);
1386 if (err)
1387 goto out;
1388
1389 err = file_update_time(file);
1390 if (err)
1391 goto out;
1392
1393 if (ci->i_inline_version != CEPH_INLINE_NONE) {
1394 err = ceph_uninline_data(file, NULL);
1395 if (err < 0)
1396 goto out;
1397 }
1398
1399retry_snap:
1400 if (ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL)) {
1401 err = -ENOSPC;
1402 goto out;
1403 }
1404
1405 dout("aio_write %p %llx.%llx %llu~%zd getting caps. i_size %llu\n",
1406 inode, ceph_vinop(inode), pos, count, i_size_read(inode));
1407 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1408 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
1409 else
1410 want = CEPH_CAP_FILE_BUFFER;
1411 got = 0;
1412 err = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, pos + count,
1413 &got, NULL);
1414 if (err < 0)
1415 goto out;
1416
1417 dout("aio_write %p %llx.%llx %llu~%zd got cap refs on %s\n",
1418 inode, ceph_vinop(inode), pos, count, ceph_cap_string(got));
1419
1420 if ((got & (CEPH_CAP_FILE_BUFFER|CEPH_CAP_FILE_LAZYIO)) == 0 ||
1421 (iocb->ki_flags & IOCB_DIRECT) || (fi->flags & CEPH_F_SYNC)) {
1422 struct ceph_snap_context *snapc;
1423 struct iov_iter data;
1424 inode_unlock(inode);
1425
1426 spin_lock(&ci->i_ceph_lock);
1427 if (__ceph_have_pending_cap_snap(ci)) {
1428 struct ceph_cap_snap *capsnap =
1429 list_last_entry(&ci->i_cap_snaps,
1430 struct ceph_cap_snap,
1431 ci_item);
1432 snapc = ceph_get_snap_context(capsnap->context);
1433 } else {
1434 BUG_ON(!ci->i_head_snapc);
1435 snapc = ceph_get_snap_context(ci->i_head_snapc);
1436 }
1437 spin_unlock(&ci->i_ceph_lock);
1438
1439 /* we might need to revert back to that point */
1440 data = *from;
1441 if (iocb->ki_flags & IOCB_DIRECT)
1442 written = ceph_direct_read_write(iocb, &data, snapc,
1443 &prealloc_cf);
1444 else
1445 written = ceph_sync_write(iocb, &data, pos, snapc);
1446 if (written == -EOLDSNAPC) {
1447 dout("aio_write %p %llx.%llx %llu~%u"
1448 "got EOLDSNAPC, retrying\n",
1449 inode, ceph_vinop(inode),
1450 pos, (unsigned)count);
1451 inode_lock(inode);
1452 goto retry_snap;
1453 }
1454 if (written > 0)
1455 iov_iter_advance(from, written);
1456 ceph_put_snap_context(snapc);
1457 } else {
1458 /*
1459 * No need to acquire the i_truncate_mutex. Because
1460 * the MDS revokes Fwb caps before sending truncate
1461 * message to us. We can't get Fwb cap while there
1462 * are pending vmtruncate. So write and vmtruncate
1463 * can not run at the same time
1464 */
1465 written = generic_perform_write(file, from, pos);
1466 if (likely(written >= 0))
1467 iocb->ki_pos = pos + written;
1468 inode_unlock(inode);
1469 }
1470
1471 if (written >= 0) {
1472 int dirty;
1473 spin_lock(&ci->i_ceph_lock);
1474 ci->i_inline_version = CEPH_INLINE_NONE;
1475 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
1476 &prealloc_cf);
1477 spin_unlock(&ci->i_ceph_lock);
1478 if (dirty)
1479 __mark_inode_dirty(inode, dirty);
1480 }
1481
1482 dout("aio_write %p %llx.%llx %llu~%u dropping cap refs on %s\n",
1483 inode, ceph_vinop(inode), pos, (unsigned)count,
1484 ceph_cap_string(got));
1485 ceph_put_cap_refs(ci, got);
1486
1487 if (written >= 0) {
1488 if (ceph_osdmap_flag(osdc, CEPH_OSDMAP_NEARFULL))
1489 iocb->ki_flags |= IOCB_DSYNC;
1490
1491 written = generic_write_sync(iocb, written);
1492 }
1493
1494 goto out_unlocked;
1495
1496out:
1497 inode_unlock(inode);
1498out_unlocked:
1499 ceph_free_cap_flush(prealloc_cf);
1500 current->backing_dev_info = NULL;
1501 return written ? written : err;
1502}
1503
1504/*
1505 * llseek. be sure to verify file size on SEEK_END.
1506 */
1507static loff_t ceph_llseek(struct file *file, loff_t offset, int whence)
1508{
1509 struct inode *inode = file->f_mapping->host;
1510 loff_t i_size;
1511 loff_t ret;
1512
1513 inode_lock(inode);
1514
1515 if (whence == SEEK_END || whence == SEEK_DATA || whence == SEEK_HOLE) {
1516 ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false);
1517 if (ret < 0)
1518 goto out;
1519 }
1520
1521 i_size = i_size_read(inode);
1522 switch (whence) {
1523 case SEEK_END:
1524 offset += i_size;
1525 break;
1526 case SEEK_CUR:
1527 /*
1528 * Here we special-case the lseek(fd, 0, SEEK_CUR)
1529 * position-querying operation. Avoid rewriting the "same"
1530 * f_pos value back to the file because a concurrent read(),
1531 * write() or lseek() might have altered it
1532 */
1533 if (offset == 0) {
1534 ret = file->f_pos;
1535 goto out;
1536 }
1537 offset += file->f_pos;
1538 break;
1539 case SEEK_DATA:
1540 if (offset >= i_size) {
1541 ret = -ENXIO;
1542 goto out;
1543 }
1544 break;
1545 case SEEK_HOLE:
1546 if (offset >= i_size) {
1547 ret = -ENXIO;
1548 goto out;
1549 }
1550 offset = i_size;
1551 break;
1552 }
1553
1554 ret = vfs_setpos(file, offset, inode->i_sb->s_maxbytes);
1555
1556out:
1557 inode_unlock(inode);
1558 return ret;
1559}
1560
1561static inline void ceph_zero_partial_page(
1562 struct inode *inode, loff_t offset, unsigned size)
1563{
1564 struct page *page;
1565 pgoff_t index = offset >> PAGE_SHIFT;
1566
1567 page = find_lock_page(inode->i_mapping, index);
1568 if (page) {
1569 wait_on_page_writeback(page);
1570 zero_user(page, offset & (PAGE_SIZE - 1), size);
1571 unlock_page(page);
1572 put_page(page);
1573 }
1574}
1575
1576static void ceph_zero_pagecache_range(struct inode *inode, loff_t offset,
1577 loff_t length)
1578{
1579 loff_t nearly = round_up(offset, PAGE_SIZE);
1580 if (offset < nearly) {
1581 loff_t size = nearly - offset;
1582 if (length < size)
1583 size = length;
1584 ceph_zero_partial_page(inode, offset, size);
1585 offset += size;
1586 length -= size;
1587 }
1588 if (length >= PAGE_SIZE) {
1589 loff_t size = round_down(length, PAGE_SIZE);
1590 truncate_pagecache_range(inode, offset, offset + size - 1);
1591 offset += size;
1592 length -= size;
1593 }
1594 if (length)
1595 ceph_zero_partial_page(inode, offset, length);
1596}
1597
1598static int ceph_zero_partial_object(struct inode *inode,
1599 loff_t offset, loff_t *length)
1600{
1601 struct ceph_inode_info *ci = ceph_inode(inode);
1602 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1603 struct ceph_osd_request *req;
1604 int ret = 0;
1605 loff_t zero = 0;
1606 int op;
1607
1608 if (!length) {
1609 op = offset ? CEPH_OSD_OP_DELETE : CEPH_OSD_OP_TRUNCATE;
1610 length = &zero;
1611 } else {
1612 op = CEPH_OSD_OP_ZERO;
1613 }
1614
1615 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1616 ceph_vino(inode),
1617 offset, length,
1618 0, 1, op,
1619 CEPH_OSD_FLAG_WRITE |
1620 CEPH_OSD_FLAG_ONDISK,
1621 NULL, 0, 0, false);
1622 if (IS_ERR(req)) {
1623 ret = PTR_ERR(req);
1624 goto out;
1625 }
1626
1627 req->r_mtime = inode->i_mtime;
1628 ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
1629 if (!ret) {
1630 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
1631 if (ret == -ENOENT)
1632 ret = 0;
1633 }
1634 ceph_osdc_put_request(req);
1635
1636out:
1637 return ret;
1638}
1639
1640static int ceph_zero_objects(struct inode *inode, loff_t offset, loff_t length)
1641{
1642 int ret = 0;
1643 struct ceph_inode_info *ci = ceph_inode(inode);
1644 s32 stripe_unit = ci->i_layout.stripe_unit;
1645 s32 stripe_count = ci->i_layout.stripe_count;
1646 s32 object_size = ci->i_layout.object_size;
1647 u64 object_set_size = object_size * stripe_count;
1648 u64 nearly, t;
1649
1650 /* round offset up to next period boundary */
1651 nearly = offset + object_set_size - 1;
1652 t = nearly;
1653 nearly -= do_div(t, object_set_size);
1654
1655 while (length && offset < nearly) {
1656 loff_t size = length;
1657 ret = ceph_zero_partial_object(inode, offset, &size);
1658 if (ret < 0)
1659 return ret;
1660 offset += size;
1661 length -= size;
1662 }
1663 while (length >= object_set_size) {
1664 int i;
1665 loff_t pos = offset;
1666 for (i = 0; i < stripe_count; ++i) {
1667 ret = ceph_zero_partial_object(inode, pos, NULL);
1668 if (ret < 0)
1669 return ret;
1670 pos += stripe_unit;
1671 }
1672 offset += object_set_size;
1673 length -= object_set_size;
1674 }
1675 while (length) {
1676 loff_t size = length;
1677 ret = ceph_zero_partial_object(inode, offset, &size);
1678 if (ret < 0)
1679 return ret;
1680 offset += size;
1681 length -= size;
1682 }
1683 return ret;
1684}
1685
1686static long ceph_fallocate(struct file *file, int mode,
1687 loff_t offset, loff_t length)
1688{
1689 struct ceph_file_info *fi = file->private_data;
1690 struct inode *inode = file_inode(file);
1691 struct ceph_inode_info *ci = ceph_inode(inode);
1692 struct ceph_osd_client *osdc =
1693 &ceph_inode_to_client(inode)->client->osdc;
1694 struct ceph_cap_flush *prealloc_cf;
1695 int want, got = 0;
1696 int dirty;
1697 int ret = 0;
1698 loff_t endoff = 0;
1699 loff_t size;
1700
1701 if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
1702 return -EOPNOTSUPP;
1703
1704 if (!S_ISREG(inode->i_mode))
1705 return -EOPNOTSUPP;
1706
1707 prealloc_cf = ceph_alloc_cap_flush();
1708 if (!prealloc_cf)
1709 return -ENOMEM;
1710
1711 inode_lock(inode);
1712
1713 if (ceph_snap(inode) != CEPH_NOSNAP) {
1714 ret = -EROFS;
1715 goto unlock;
1716 }
1717
1718 if (ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL) &&
1719 !(mode & FALLOC_FL_PUNCH_HOLE)) {
1720 ret = -ENOSPC;
1721 goto unlock;
1722 }
1723
1724 if (ci->i_inline_version != CEPH_INLINE_NONE) {
1725 ret = ceph_uninline_data(file, NULL);
1726 if (ret < 0)
1727 goto unlock;
1728 }
1729
1730 size = i_size_read(inode);
1731 if (!(mode & FALLOC_FL_KEEP_SIZE))
1732 endoff = offset + length;
1733
1734 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1735 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
1736 else
1737 want = CEPH_CAP_FILE_BUFFER;
1738
1739 ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, endoff, &got, NULL);
1740 if (ret < 0)
1741 goto unlock;
1742
1743 if (mode & FALLOC_FL_PUNCH_HOLE) {
1744 if (offset < size)
1745 ceph_zero_pagecache_range(inode, offset, length);
1746 ret = ceph_zero_objects(inode, offset, length);
1747 } else if (endoff > size) {
1748 truncate_pagecache_range(inode, size, -1);
1749 if (ceph_inode_set_size(inode, endoff))
1750 ceph_check_caps(ceph_inode(inode),
1751 CHECK_CAPS_AUTHONLY, NULL);
1752 }
1753
1754 if (!ret) {
1755 spin_lock(&ci->i_ceph_lock);
1756 ci->i_inline_version = CEPH_INLINE_NONE;
1757 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
1758 &prealloc_cf);
1759 spin_unlock(&ci->i_ceph_lock);
1760 if (dirty)
1761 __mark_inode_dirty(inode, dirty);
1762 }
1763
1764 ceph_put_cap_refs(ci, got);
1765unlock:
1766 inode_unlock(inode);
1767 ceph_free_cap_flush(prealloc_cf);
1768 return ret;
1769}
1770
1771const struct file_operations ceph_file_fops = {
1772 .open = ceph_open,
1773 .release = ceph_release,
1774 .llseek = ceph_llseek,
1775 .read_iter = ceph_read_iter,
1776 .write_iter = ceph_write_iter,
1777 .mmap = ceph_mmap,
1778 .fsync = ceph_fsync,
1779 .lock = ceph_lock,
1780 .flock = ceph_flock,
1781 .splice_read = generic_file_splice_read,
1782 .splice_write = iter_file_splice_write,
1783 .unlocked_ioctl = ceph_ioctl,
1784 .compat_ioctl = ceph_ioctl,
1785 .fallocate = ceph_fallocate,
1786};
1787
1// SPDX-License-Identifier: GPL-2.0
2#include <linux/ceph/ceph_debug.h>
3#include <linux/ceph/striper.h>
4
5#include <linux/module.h>
6#include <linux/sched.h>
7#include <linux/slab.h>
8#include <linux/file.h>
9#include <linux/mount.h>
10#include <linux/namei.h>
11#include <linux/writeback.h>
12#include <linux/falloc.h>
13#include <linux/iversion.h>
14#include <linux/ktime.h>
15
16#include "super.h"
17#include "mds_client.h"
18#include "cache.h"
19#include "io.h"
20#include "metric.h"
21
22static __le32 ceph_flags_sys2wire(u32 flags)
23{
24 u32 wire_flags = 0;
25
26 switch (flags & O_ACCMODE) {
27 case O_RDONLY:
28 wire_flags |= CEPH_O_RDONLY;
29 break;
30 case O_WRONLY:
31 wire_flags |= CEPH_O_WRONLY;
32 break;
33 case O_RDWR:
34 wire_flags |= CEPH_O_RDWR;
35 break;
36 }
37
38 flags &= ~O_ACCMODE;
39
40#define ceph_sys2wire(a) if (flags & a) { wire_flags |= CEPH_##a; flags &= ~a; }
41
42 ceph_sys2wire(O_CREAT);
43 ceph_sys2wire(O_EXCL);
44 ceph_sys2wire(O_TRUNC);
45 ceph_sys2wire(O_DIRECTORY);
46 ceph_sys2wire(O_NOFOLLOW);
47
48#undef ceph_sys2wire
49
50 if (flags)
51 dout("unused open flags: %x\n", flags);
52
53 return cpu_to_le32(wire_flags);
54}
55
56/*
57 * Ceph file operations
58 *
59 * Implement basic open/close functionality, and implement
60 * read/write.
61 *
62 * We implement three modes of file I/O:
63 * - buffered uses the generic_file_aio_{read,write} helpers
64 *
65 * - synchronous is used when there is multi-client read/write
66 * sharing, avoids the page cache, and synchronously waits for an
67 * ack from the OSD.
68 *
69 * - direct io takes the variant of the sync path that references
70 * user pages directly.
71 *
72 * fsync() flushes and waits on dirty pages, but just queues metadata
73 * for writeback: since the MDS can recover size and mtime there is no
74 * need to wait for MDS acknowledgement.
75 */
76
77/*
78 * How many pages to get in one call to iov_iter_get_pages(). This
79 * determines the size of the on-stack array used as a buffer.
80 */
81#define ITER_GET_BVECS_PAGES 64
82
83static ssize_t __iter_get_bvecs(struct iov_iter *iter, size_t maxsize,
84 struct bio_vec *bvecs)
85{
86 size_t size = 0;
87 int bvec_idx = 0;
88
89 if (maxsize > iov_iter_count(iter))
90 maxsize = iov_iter_count(iter);
91
92 while (size < maxsize) {
93 struct page *pages[ITER_GET_BVECS_PAGES];
94 ssize_t bytes;
95 size_t start;
96 int idx = 0;
97
98 bytes = iov_iter_get_pages2(iter, pages, maxsize - size,
99 ITER_GET_BVECS_PAGES, &start);
100 if (bytes < 0)
101 return size ?: bytes;
102
103 size += bytes;
104
105 for ( ; bytes; idx++, bvec_idx++) {
106 struct bio_vec bv = {
107 .bv_page = pages[idx],
108 .bv_len = min_t(int, bytes, PAGE_SIZE - start),
109 .bv_offset = start,
110 };
111
112 bvecs[bvec_idx] = bv;
113 bytes -= bv.bv_len;
114 start = 0;
115 }
116 }
117
118 return size;
119}
120
121/*
122 * iov_iter_get_pages() only considers one iov_iter segment, no matter
123 * what maxsize or maxpages are given. For ITER_BVEC that is a single
124 * page.
125 *
126 * Attempt to get up to @maxsize bytes worth of pages from @iter.
127 * Return the number of bytes in the created bio_vec array, or an error.
128 */
129static ssize_t iter_get_bvecs_alloc(struct iov_iter *iter, size_t maxsize,
130 struct bio_vec **bvecs, int *num_bvecs)
131{
132 struct bio_vec *bv;
133 size_t orig_count = iov_iter_count(iter);
134 ssize_t bytes;
135 int npages;
136
137 iov_iter_truncate(iter, maxsize);
138 npages = iov_iter_npages(iter, INT_MAX);
139 iov_iter_reexpand(iter, orig_count);
140
141 /*
142 * __iter_get_bvecs() may populate only part of the array -- zero it
143 * out.
144 */
145 bv = kvmalloc_array(npages, sizeof(*bv), GFP_KERNEL | __GFP_ZERO);
146 if (!bv)
147 return -ENOMEM;
148
149 bytes = __iter_get_bvecs(iter, maxsize, bv);
150 if (bytes < 0) {
151 /*
152 * No pages were pinned -- just free the array.
153 */
154 kvfree(bv);
155 return bytes;
156 }
157
158 *bvecs = bv;
159 *num_bvecs = npages;
160 return bytes;
161}
162
163static void put_bvecs(struct bio_vec *bvecs, int num_bvecs, bool should_dirty)
164{
165 int i;
166
167 for (i = 0; i < num_bvecs; i++) {
168 if (bvecs[i].bv_page) {
169 if (should_dirty)
170 set_page_dirty_lock(bvecs[i].bv_page);
171 put_page(bvecs[i].bv_page);
172 }
173 }
174 kvfree(bvecs);
175}
176
177/*
178 * Prepare an open request. Preallocate ceph_cap to avoid an
179 * inopportune ENOMEM later.
180 */
181static struct ceph_mds_request *
182prepare_open_request(struct super_block *sb, int flags, int create_mode)
183{
184 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(sb);
185 struct ceph_mds_request *req;
186 int want_auth = USE_ANY_MDS;
187 int op = (flags & O_CREAT) ? CEPH_MDS_OP_CREATE : CEPH_MDS_OP_OPEN;
188
189 if (flags & (O_WRONLY|O_RDWR|O_CREAT|O_TRUNC))
190 want_auth = USE_AUTH_MDS;
191
192 req = ceph_mdsc_create_request(mdsc, op, want_auth);
193 if (IS_ERR(req))
194 goto out;
195 req->r_fmode = ceph_flags_to_mode(flags);
196 req->r_args.open.flags = ceph_flags_sys2wire(flags);
197 req->r_args.open.mode = cpu_to_le32(create_mode);
198out:
199 return req;
200}
201
202static int ceph_init_file_info(struct inode *inode, struct file *file,
203 int fmode, bool isdir)
204{
205 struct ceph_inode_info *ci = ceph_inode(inode);
206 struct ceph_mount_options *opt =
207 ceph_inode_to_client(&ci->netfs.inode)->mount_options;
208 struct ceph_file_info *fi;
209 int ret;
210
211 dout("%s %p %p 0%o (%s)\n", __func__, inode, file,
212 inode->i_mode, isdir ? "dir" : "regular");
213 BUG_ON(inode->i_fop->release != ceph_release);
214
215 if (isdir) {
216 struct ceph_dir_file_info *dfi =
217 kmem_cache_zalloc(ceph_dir_file_cachep, GFP_KERNEL);
218 if (!dfi)
219 return -ENOMEM;
220
221 file->private_data = dfi;
222 fi = &dfi->file_info;
223 dfi->next_offset = 2;
224 dfi->readdir_cache_idx = -1;
225 } else {
226 fi = kmem_cache_zalloc(ceph_file_cachep, GFP_KERNEL);
227 if (!fi)
228 return -ENOMEM;
229
230 if (opt->flags & CEPH_MOUNT_OPT_NOPAGECACHE)
231 fi->flags |= CEPH_F_SYNC;
232
233 file->private_data = fi;
234 }
235
236 ceph_get_fmode(ci, fmode, 1);
237 fi->fmode = fmode;
238
239 spin_lock_init(&fi->rw_contexts_lock);
240 INIT_LIST_HEAD(&fi->rw_contexts);
241 fi->filp_gen = READ_ONCE(ceph_inode_to_client(inode)->filp_gen);
242
243 if ((file->f_mode & FMODE_WRITE) && ceph_has_inline_data(ci)) {
244 ret = ceph_uninline_data(file);
245 if (ret < 0)
246 goto error;
247 }
248
249 return 0;
250
251error:
252 ceph_fscache_unuse_cookie(inode, file->f_mode & FMODE_WRITE);
253 ceph_put_fmode(ci, fi->fmode, 1);
254 kmem_cache_free(ceph_file_cachep, fi);
255 /* wake up anyone waiting for caps on this inode */
256 wake_up_all(&ci->i_cap_wq);
257 return ret;
258}
259
260/*
261 * initialize private struct file data.
262 * if we fail, clean up by dropping fmode reference on the ceph_inode
263 */
264static int ceph_init_file(struct inode *inode, struct file *file, int fmode)
265{
266 int ret = 0;
267
268 switch (inode->i_mode & S_IFMT) {
269 case S_IFREG:
270 ceph_fscache_use_cookie(inode, file->f_mode & FMODE_WRITE);
271 fallthrough;
272 case S_IFDIR:
273 ret = ceph_init_file_info(inode, file, fmode,
274 S_ISDIR(inode->i_mode));
275 break;
276
277 case S_IFLNK:
278 dout("init_file %p %p 0%o (symlink)\n", inode, file,
279 inode->i_mode);
280 break;
281
282 default:
283 dout("init_file %p %p 0%o (special)\n", inode, file,
284 inode->i_mode);
285 /*
286 * we need to drop the open ref now, since we don't
287 * have .release set to ceph_release.
288 */
289 BUG_ON(inode->i_fop->release == ceph_release);
290
291 /* call the proper open fop */
292 ret = inode->i_fop->open(inode, file);
293 }
294 return ret;
295}
296
297/*
298 * try renew caps after session gets killed.
299 */
300int ceph_renew_caps(struct inode *inode, int fmode)
301{
302 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
303 struct ceph_inode_info *ci = ceph_inode(inode);
304 struct ceph_mds_request *req;
305 int err, flags, wanted;
306
307 spin_lock(&ci->i_ceph_lock);
308 __ceph_touch_fmode(ci, mdsc, fmode);
309 wanted = __ceph_caps_file_wanted(ci);
310 if (__ceph_is_any_real_caps(ci) &&
311 (!(wanted & CEPH_CAP_ANY_WR) || ci->i_auth_cap)) {
312 int issued = __ceph_caps_issued(ci, NULL);
313 spin_unlock(&ci->i_ceph_lock);
314 dout("renew caps %p want %s issued %s updating mds_wanted\n",
315 inode, ceph_cap_string(wanted), ceph_cap_string(issued));
316 ceph_check_caps(ci, 0);
317 return 0;
318 }
319 spin_unlock(&ci->i_ceph_lock);
320
321 flags = 0;
322 if ((wanted & CEPH_CAP_FILE_RD) && (wanted & CEPH_CAP_FILE_WR))
323 flags = O_RDWR;
324 else if (wanted & CEPH_CAP_FILE_RD)
325 flags = O_RDONLY;
326 else if (wanted & CEPH_CAP_FILE_WR)
327 flags = O_WRONLY;
328#ifdef O_LAZY
329 if (wanted & CEPH_CAP_FILE_LAZYIO)
330 flags |= O_LAZY;
331#endif
332
333 req = prepare_open_request(inode->i_sb, flags, 0);
334 if (IS_ERR(req)) {
335 err = PTR_ERR(req);
336 goto out;
337 }
338
339 req->r_inode = inode;
340 ihold(inode);
341 req->r_num_caps = 1;
342
343 err = ceph_mdsc_do_request(mdsc, NULL, req);
344 ceph_mdsc_put_request(req);
345out:
346 dout("renew caps %p open result=%d\n", inode, err);
347 return err < 0 ? err : 0;
348}
349
350/*
351 * If we already have the requisite capabilities, we can satisfy
352 * the open request locally (no need to request new caps from the
353 * MDS). We do, however, need to inform the MDS (asynchronously)
354 * if our wanted caps set expands.
355 */
356int ceph_open(struct inode *inode, struct file *file)
357{
358 struct ceph_inode_info *ci = ceph_inode(inode);
359 struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
360 struct ceph_mds_client *mdsc = fsc->mdsc;
361 struct ceph_mds_request *req;
362 struct ceph_file_info *fi = file->private_data;
363 int err;
364 int flags, fmode, wanted;
365
366 if (fi) {
367 dout("open file %p is already opened\n", file);
368 return 0;
369 }
370
371 /* filter out O_CREAT|O_EXCL; vfs did that already. yuck. */
372 flags = file->f_flags & ~(O_CREAT|O_EXCL);
373 if (S_ISDIR(inode->i_mode))
374 flags = O_DIRECTORY; /* mds likes to know */
375
376 dout("open inode %p ino %llx.%llx file %p flags %d (%d)\n", inode,
377 ceph_vinop(inode), file, flags, file->f_flags);
378 fmode = ceph_flags_to_mode(flags);
379 wanted = ceph_caps_for_mode(fmode);
380
381 /* snapped files are read-only */
382 if (ceph_snap(inode) != CEPH_NOSNAP && (file->f_mode & FMODE_WRITE))
383 return -EROFS;
384
385 /* trivially open snapdir */
386 if (ceph_snap(inode) == CEPH_SNAPDIR) {
387 return ceph_init_file(inode, file, fmode);
388 }
389
390 /*
391 * No need to block if we have caps on the auth MDS (for
392 * write) or any MDS (for read). Update wanted set
393 * asynchronously.
394 */
395 spin_lock(&ci->i_ceph_lock);
396 if (__ceph_is_any_real_caps(ci) &&
397 (((fmode & CEPH_FILE_MODE_WR) == 0) || ci->i_auth_cap)) {
398 int mds_wanted = __ceph_caps_mds_wanted(ci, true);
399 int issued = __ceph_caps_issued(ci, NULL);
400
401 dout("open %p fmode %d want %s issued %s using existing\n",
402 inode, fmode, ceph_cap_string(wanted),
403 ceph_cap_string(issued));
404 __ceph_touch_fmode(ci, mdsc, fmode);
405 spin_unlock(&ci->i_ceph_lock);
406
407 /* adjust wanted? */
408 if ((issued & wanted) != wanted &&
409 (mds_wanted & wanted) != wanted &&
410 ceph_snap(inode) != CEPH_SNAPDIR)
411 ceph_check_caps(ci, 0);
412
413 return ceph_init_file(inode, file, fmode);
414 } else if (ceph_snap(inode) != CEPH_NOSNAP &&
415 (ci->i_snap_caps & wanted) == wanted) {
416 __ceph_touch_fmode(ci, mdsc, fmode);
417 spin_unlock(&ci->i_ceph_lock);
418 return ceph_init_file(inode, file, fmode);
419 }
420
421 spin_unlock(&ci->i_ceph_lock);
422
423 dout("open fmode %d wants %s\n", fmode, ceph_cap_string(wanted));
424 req = prepare_open_request(inode->i_sb, flags, 0);
425 if (IS_ERR(req)) {
426 err = PTR_ERR(req);
427 goto out;
428 }
429 req->r_inode = inode;
430 ihold(inode);
431
432 req->r_num_caps = 1;
433 err = ceph_mdsc_do_request(mdsc, NULL, req);
434 if (!err)
435 err = ceph_init_file(inode, file, req->r_fmode);
436 ceph_mdsc_put_request(req);
437 dout("open result=%d on %llx.%llx\n", err, ceph_vinop(inode));
438out:
439 return err;
440}
441
442/* Clone the layout from a synchronous create, if the dir now has Dc caps */
443static void
444cache_file_layout(struct inode *dst, struct inode *src)
445{
446 struct ceph_inode_info *cdst = ceph_inode(dst);
447 struct ceph_inode_info *csrc = ceph_inode(src);
448
449 spin_lock(&cdst->i_ceph_lock);
450 if ((__ceph_caps_issued(cdst, NULL) & CEPH_CAP_DIR_CREATE) &&
451 !ceph_file_layout_is_valid(&cdst->i_cached_layout)) {
452 memcpy(&cdst->i_cached_layout, &csrc->i_layout,
453 sizeof(cdst->i_cached_layout));
454 rcu_assign_pointer(cdst->i_cached_layout.pool_ns,
455 ceph_try_get_string(csrc->i_layout.pool_ns));
456 }
457 spin_unlock(&cdst->i_ceph_lock);
458}
459
460/*
461 * Try to set up an async create. We need caps, a file layout, and inode number,
462 * and either a lease on the dentry or complete dir info. If any of those
463 * criteria are not satisfied, then return false and the caller can go
464 * synchronous.
465 */
466static int try_prep_async_create(struct inode *dir, struct dentry *dentry,
467 struct ceph_file_layout *lo, u64 *pino)
468{
469 struct ceph_inode_info *ci = ceph_inode(dir);
470 struct ceph_dentry_info *di = ceph_dentry(dentry);
471 int got = 0, want = CEPH_CAP_FILE_EXCL | CEPH_CAP_DIR_CREATE;
472 u64 ino;
473
474 spin_lock(&ci->i_ceph_lock);
475 /* No auth cap means no chance for Dc caps */
476 if (!ci->i_auth_cap)
477 goto no_async;
478
479 /* Any delegated inos? */
480 if (xa_empty(&ci->i_auth_cap->session->s_delegated_inos))
481 goto no_async;
482
483 if (!ceph_file_layout_is_valid(&ci->i_cached_layout))
484 goto no_async;
485
486 if ((__ceph_caps_issued(ci, NULL) & want) != want)
487 goto no_async;
488
489 if (d_in_lookup(dentry)) {
490 if (!__ceph_dir_is_complete(ci))
491 goto no_async;
492 spin_lock(&dentry->d_lock);
493 di->lease_shared_gen = atomic_read(&ci->i_shared_gen);
494 spin_unlock(&dentry->d_lock);
495 } else if (atomic_read(&ci->i_shared_gen) !=
496 READ_ONCE(di->lease_shared_gen)) {
497 goto no_async;
498 }
499
500 ino = ceph_get_deleg_ino(ci->i_auth_cap->session);
501 if (!ino)
502 goto no_async;
503
504 *pino = ino;
505 ceph_take_cap_refs(ci, want, false);
506 memcpy(lo, &ci->i_cached_layout, sizeof(*lo));
507 rcu_assign_pointer(lo->pool_ns,
508 ceph_try_get_string(ci->i_cached_layout.pool_ns));
509 got = want;
510no_async:
511 spin_unlock(&ci->i_ceph_lock);
512 return got;
513}
514
515static void restore_deleg_ino(struct inode *dir, u64 ino)
516{
517 struct ceph_inode_info *ci = ceph_inode(dir);
518 struct ceph_mds_session *s = NULL;
519
520 spin_lock(&ci->i_ceph_lock);
521 if (ci->i_auth_cap)
522 s = ceph_get_mds_session(ci->i_auth_cap->session);
523 spin_unlock(&ci->i_ceph_lock);
524 if (s) {
525 int err = ceph_restore_deleg_ino(s, ino);
526 if (err)
527 pr_warn("ceph: unable to restore delegated ino 0x%llx to session: %d\n",
528 ino, err);
529 ceph_put_mds_session(s);
530 }
531}
532
533static void wake_async_create_waiters(struct inode *inode,
534 struct ceph_mds_session *session)
535{
536 struct ceph_inode_info *ci = ceph_inode(inode);
537 bool check_cap = false;
538
539 spin_lock(&ci->i_ceph_lock);
540 if (ci->i_ceph_flags & CEPH_I_ASYNC_CREATE) {
541 ci->i_ceph_flags &= ~CEPH_I_ASYNC_CREATE;
542 wake_up_bit(&ci->i_ceph_flags, CEPH_ASYNC_CREATE_BIT);
543
544 if (ci->i_ceph_flags & CEPH_I_ASYNC_CHECK_CAPS) {
545 ci->i_ceph_flags &= ~CEPH_I_ASYNC_CHECK_CAPS;
546 check_cap = true;
547 }
548 }
549 ceph_kick_flushing_inode_caps(session, ci);
550 spin_unlock(&ci->i_ceph_lock);
551
552 if (check_cap)
553 ceph_check_caps(ci, CHECK_CAPS_FLUSH);
554}
555
556static void ceph_async_create_cb(struct ceph_mds_client *mdsc,
557 struct ceph_mds_request *req)
558{
559 struct dentry *dentry = req->r_dentry;
560 struct inode *dinode = d_inode(dentry);
561 struct inode *tinode = req->r_target_inode;
562 int result = req->r_err ? req->r_err :
563 le32_to_cpu(req->r_reply_info.head->result);
564
565 WARN_ON_ONCE(dinode && tinode && dinode != tinode);
566
567 /* MDS changed -- caller must resubmit */
568 if (result == -EJUKEBOX)
569 goto out;
570
571 mapping_set_error(req->r_parent->i_mapping, result);
572
573 if (result) {
574 int pathlen = 0;
575 u64 base = 0;
576 char *path = ceph_mdsc_build_path(req->r_dentry, &pathlen,
577 &base, 0);
578
579 pr_warn("async create failure path=(%llx)%s result=%d!\n",
580 base, IS_ERR(path) ? "<<bad>>" : path, result);
581 ceph_mdsc_free_path(path, pathlen);
582
583 ceph_dir_clear_complete(req->r_parent);
584 if (!d_unhashed(dentry))
585 d_drop(dentry);
586
587 if (dinode) {
588 mapping_set_error(dinode->i_mapping, result);
589 ceph_inode_shutdown(dinode);
590 wake_async_create_waiters(dinode, req->r_session);
591 }
592 }
593
594 if (tinode) {
595 u64 ino = ceph_vino(tinode).ino;
596
597 if (req->r_deleg_ino != ino)
598 pr_warn("%s: inode number mismatch! err=%d deleg_ino=0x%llx target=0x%llx\n",
599 __func__, req->r_err, req->r_deleg_ino, ino);
600
601 mapping_set_error(tinode->i_mapping, result);
602 wake_async_create_waiters(tinode, req->r_session);
603 } else if (!result) {
604 pr_warn("%s: no req->r_target_inode for 0x%llx\n", __func__,
605 req->r_deleg_ino);
606 }
607out:
608 ceph_mdsc_release_dir_caps(req);
609}
610
611static int ceph_finish_async_create(struct inode *dir, struct dentry *dentry,
612 struct file *file, umode_t mode,
613 struct ceph_mds_request *req,
614 struct ceph_acl_sec_ctx *as_ctx,
615 struct ceph_file_layout *lo)
616{
617 int ret;
618 char xattr_buf[4];
619 struct ceph_mds_reply_inode in = { };
620 struct ceph_mds_reply_info_in iinfo = { .in = &in };
621 struct ceph_inode_info *ci = ceph_inode(dir);
622 struct ceph_dentry_info *di = ceph_dentry(dentry);
623 struct inode *inode;
624 struct timespec64 now;
625 struct ceph_string *pool_ns;
626 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb);
627 struct ceph_vino vino = { .ino = req->r_deleg_ino,
628 .snap = CEPH_NOSNAP };
629
630 ktime_get_real_ts64(&now);
631
632 inode = ceph_get_inode(dentry->d_sb, vino);
633 if (IS_ERR(inode))
634 return PTR_ERR(inode);
635
636 iinfo.inline_version = CEPH_INLINE_NONE;
637 iinfo.change_attr = 1;
638 ceph_encode_timespec64(&iinfo.btime, &now);
639
640 if (req->r_pagelist) {
641 iinfo.xattr_len = req->r_pagelist->length;
642 iinfo.xattr_data = req->r_pagelist->mapped_tail;
643 } else {
644 /* fake it */
645 iinfo.xattr_len = ARRAY_SIZE(xattr_buf);
646 iinfo.xattr_data = xattr_buf;
647 memset(iinfo.xattr_data, 0, iinfo.xattr_len);
648 }
649
650 in.ino = cpu_to_le64(vino.ino);
651 in.snapid = cpu_to_le64(CEPH_NOSNAP);
652 in.version = cpu_to_le64(1); // ???
653 in.cap.caps = in.cap.wanted = cpu_to_le32(CEPH_CAP_ALL_FILE);
654 in.cap.cap_id = cpu_to_le64(1);
655 in.cap.realm = cpu_to_le64(ci->i_snap_realm->ino);
656 in.cap.flags = CEPH_CAP_FLAG_AUTH;
657 in.ctime = in.mtime = in.atime = iinfo.btime;
658 in.truncate_seq = cpu_to_le32(1);
659 in.truncate_size = cpu_to_le64(-1ULL);
660 in.xattr_version = cpu_to_le64(1);
661 in.uid = cpu_to_le32(from_kuid(&init_user_ns, current_fsuid()));
662 if (dir->i_mode & S_ISGID) {
663 in.gid = cpu_to_le32(from_kgid(&init_user_ns, dir->i_gid));
664
665 /* Directories always inherit the setgid bit. */
666 if (S_ISDIR(mode))
667 mode |= S_ISGID;
668 } else {
669 in.gid = cpu_to_le32(from_kgid(&init_user_ns, current_fsgid()));
670 }
671 in.mode = cpu_to_le32((u32)mode);
672
673 in.nlink = cpu_to_le32(1);
674 in.max_size = cpu_to_le64(lo->stripe_unit);
675
676 ceph_file_layout_to_legacy(lo, &in.layout);
677 /* lo is private, so pool_ns can't change */
678 pool_ns = rcu_dereference_raw(lo->pool_ns);
679 if (pool_ns) {
680 iinfo.pool_ns_len = pool_ns->len;
681 iinfo.pool_ns_data = pool_ns->str;
682 }
683
684 down_read(&mdsc->snap_rwsem);
685 ret = ceph_fill_inode(inode, NULL, &iinfo, NULL, req->r_session,
686 req->r_fmode, NULL);
687 up_read(&mdsc->snap_rwsem);
688 if (ret) {
689 dout("%s failed to fill inode: %d\n", __func__, ret);
690 ceph_dir_clear_complete(dir);
691 if (!d_unhashed(dentry))
692 d_drop(dentry);
693 if (inode->i_state & I_NEW)
694 discard_new_inode(inode);
695 } else {
696 struct dentry *dn;
697
698 dout("%s d_adding new inode 0x%llx to 0x%llx/%s\n", __func__,
699 vino.ino, ceph_ino(dir), dentry->d_name.name);
700 ceph_dir_clear_ordered(dir);
701 ceph_init_inode_acls(inode, as_ctx);
702 if (inode->i_state & I_NEW) {
703 /*
704 * If it's not I_NEW, then someone created this before
705 * we got here. Assume the server is aware of it at
706 * that point and don't worry about setting
707 * CEPH_I_ASYNC_CREATE.
708 */
709 ceph_inode(inode)->i_ceph_flags = CEPH_I_ASYNC_CREATE;
710 unlock_new_inode(inode);
711 }
712 if (d_in_lookup(dentry) || d_really_is_negative(dentry)) {
713 if (!d_unhashed(dentry))
714 d_drop(dentry);
715 dn = d_splice_alias(inode, dentry);
716 WARN_ON_ONCE(dn && dn != dentry);
717 }
718 file->f_mode |= FMODE_CREATED;
719 ret = finish_open(file, dentry, ceph_open);
720 }
721
722 spin_lock(&dentry->d_lock);
723 di->flags &= ~CEPH_DENTRY_ASYNC_CREATE;
724 wake_up_bit(&di->flags, CEPH_DENTRY_ASYNC_CREATE_BIT);
725 spin_unlock(&dentry->d_lock);
726
727 return ret;
728}
729
730/*
731 * Do a lookup + open with a single request. If we get a non-existent
732 * file or symlink, return 1 so the VFS can retry.
733 */
734int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
735 struct file *file, unsigned flags, umode_t mode)
736{
737 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
738 struct ceph_mds_client *mdsc = fsc->mdsc;
739 struct ceph_mds_request *req;
740 struct dentry *dn;
741 struct ceph_acl_sec_ctx as_ctx = {};
742 bool try_async = ceph_test_mount_opt(fsc, ASYNC_DIROPS);
743 int mask;
744 int err;
745
746 dout("atomic_open %p dentry %p '%pd' %s flags %d mode 0%o\n",
747 dir, dentry, dentry,
748 d_unhashed(dentry) ? "unhashed" : "hashed", flags, mode);
749
750 if (dentry->d_name.len > NAME_MAX)
751 return -ENAMETOOLONG;
752
753 err = ceph_wait_on_conflict_unlink(dentry);
754 if (err)
755 return err;
756 /*
757 * Do not truncate the file, since atomic_open is called before the
758 * permission check. The caller will do the truncation afterward.
759 */
760 flags &= ~O_TRUNC;
761
762 if (flags & O_CREAT) {
763 if (ceph_quota_is_max_files_exceeded(dir))
764 return -EDQUOT;
765 err = ceph_pre_init_acls(dir, &mode, &as_ctx);
766 if (err < 0)
767 return err;
768 err = ceph_security_init_secctx(dentry, mode, &as_ctx);
769 if (err < 0)
770 goto out_ctx;
771 /* Async create can't handle more than a page of xattrs */
772 if (as_ctx.pagelist &&
773 !list_is_singular(&as_ctx.pagelist->head))
774 try_async = false;
775 } else if (!d_in_lookup(dentry)) {
776 /* If it's not being looked up, it's negative */
777 return -ENOENT;
778 }
779retry:
780 /* do the open */
781 req = prepare_open_request(dir->i_sb, flags, mode);
782 if (IS_ERR(req)) {
783 err = PTR_ERR(req);
784 goto out_ctx;
785 }
786 req->r_dentry = dget(dentry);
787 req->r_num_caps = 2;
788 mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED;
789 if (ceph_security_xattr_wanted(dir))
790 mask |= CEPH_CAP_XATTR_SHARED;
791 req->r_args.open.mask = cpu_to_le32(mask);
792 req->r_parent = dir;
793 ihold(dir);
794
795 if (flags & O_CREAT) {
796 struct ceph_file_layout lo;
797
798 req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL;
799 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
800 if (as_ctx.pagelist) {
801 req->r_pagelist = as_ctx.pagelist;
802 as_ctx.pagelist = NULL;
803 }
804 if (try_async &&
805 (req->r_dir_caps =
806 try_prep_async_create(dir, dentry, &lo,
807 &req->r_deleg_ino))) {
808 struct ceph_dentry_info *di = ceph_dentry(dentry);
809
810 set_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags);
811 req->r_args.open.flags |= cpu_to_le32(CEPH_O_EXCL);
812 req->r_callback = ceph_async_create_cb;
813
814 spin_lock(&dentry->d_lock);
815 di->flags |= CEPH_DENTRY_ASYNC_CREATE;
816 spin_unlock(&dentry->d_lock);
817
818 err = ceph_mdsc_submit_request(mdsc, dir, req);
819 if (!err) {
820 err = ceph_finish_async_create(dir, dentry,
821 file, mode, req,
822 &as_ctx, &lo);
823 } else if (err == -EJUKEBOX) {
824 restore_deleg_ino(dir, req->r_deleg_ino);
825 ceph_mdsc_put_request(req);
826 try_async = false;
827 ceph_put_string(rcu_dereference_raw(lo.pool_ns));
828 goto retry;
829 }
830 ceph_put_string(rcu_dereference_raw(lo.pool_ns));
831 goto out_req;
832 }
833 }
834
835 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
836 err = ceph_mdsc_do_request(mdsc, (flags & O_CREAT) ? dir : NULL, req);
837 if (err == -ENOENT) {
838 dentry = ceph_handle_snapdir(req, dentry);
839 if (IS_ERR(dentry)) {
840 err = PTR_ERR(dentry);
841 goto out_req;
842 }
843 err = 0;
844 }
845
846 if (!err && (flags & O_CREAT) && !req->r_reply_info.head->is_dentry)
847 err = ceph_handle_notrace_create(dir, dentry);
848
849 if (d_in_lookup(dentry)) {
850 dn = ceph_finish_lookup(req, dentry, err);
851 if (IS_ERR(dn))
852 err = PTR_ERR(dn);
853 } else {
854 /* we were given a hashed negative dentry */
855 dn = NULL;
856 }
857 if (err)
858 goto out_req;
859 if (dn || d_really_is_negative(dentry) || d_is_symlink(dentry)) {
860 /* make vfs retry on splice, ENOENT, or symlink */
861 dout("atomic_open finish_no_open on dn %p\n", dn);
862 err = finish_no_open(file, dn);
863 } else {
864 dout("atomic_open finish_open on dn %p\n", dn);
865 if (req->r_op == CEPH_MDS_OP_CREATE && req->r_reply_info.has_create_ino) {
866 struct inode *newino = d_inode(dentry);
867
868 cache_file_layout(dir, newino);
869 ceph_init_inode_acls(newino, &as_ctx);
870 file->f_mode |= FMODE_CREATED;
871 }
872 err = finish_open(file, dentry, ceph_open);
873 }
874out_req:
875 ceph_mdsc_put_request(req);
876out_ctx:
877 ceph_release_acl_sec_ctx(&as_ctx);
878 dout("atomic_open result=%d\n", err);
879 return err;
880}
881
882int ceph_release(struct inode *inode, struct file *file)
883{
884 struct ceph_inode_info *ci = ceph_inode(inode);
885
886 if (S_ISDIR(inode->i_mode)) {
887 struct ceph_dir_file_info *dfi = file->private_data;
888 dout("release inode %p dir file %p\n", inode, file);
889 WARN_ON(!list_empty(&dfi->file_info.rw_contexts));
890
891 ceph_put_fmode(ci, dfi->file_info.fmode, 1);
892
893 if (dfi->last_readdir)
894 ceph_mdsc_put_request(dfi->last_readdir);
895 kfree(dfi->last_name);
896 kfree(dfi->dir_info);
897 kmem_cache_free(ceph_dir_file_cachep, dfi);
898 } else {
899 struct ceph_file_info *fi = file->private_data;
900 dout("release inode %p regular file %p\n", inode, file);
901 WARN_ON(!list_empty(&fi->rw_contexts));
902
903 ceph_fscache_unuse_cookie(inode, file->f_mode & FMODE_WRITE);
904 ceph_put_fmode(ci, fi->fmode, 1);
905
906 kmem_cache_free(ceph_file_cachep, fi);
907 }
908
909 /* wake up anyone waiting for caps on this inode */
910 wake_up_all(&ci->i_cap_wq);
911 return 0;
912}
913
914enum {
915 HAVE_RETRIED = 1,
916 CHECK_EOF = 2,
917 READ_INLINE = 3,
918};
919
920/*
921 * Completely synchronous read and write methods. Direct from __user
922 * buffer to osd, or directly to user pages (if O_DIRECT).
923 *
924 * If the read spans object boundary, just do multiple reads. (That's not
925 * atomic, but good enough for now.)
926 *
927 * If we get a short result from the OSD, check against i_size; we need to
928 * only return a short read to the caller if we hit EOF.
929 */
930static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *to,
931 int *retry_op)
932{
933 struct file *file = iocb->ki_filp;
934 struct inode *inode = file_inode(file);
935 struct ceph_inode_info *ci = ceph_inode(inode);
936 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
937 struct ceph_osd_client *osdc = &fsc->client->osdc;
938 ssize_t ret;
939 u64 off = iocb->ki_pos;
940 u64 len = iov_iter_count(to);
941 u64 i_size = i_size_read(inode);
942
943 dout("sync_read on file %p %llu~%u %s\n", file, off, (unsigned)len,
944 (file->f_flags & O_DIRECT) ? "O_DIRECT" : "");
945
946 if (!len)
947 return 0;
948 /*
949 * flush any page cache pages in this range. this
950 * will make concurrent normal and sync io slow,
951 * but it will at least behave sensibly when they are
952 * in sequence.
953 */
954 ret = filemap_write_and_wait_range(inode->i_mapping,
955 off, off + len - 1);
956 if (ret < 0)
957 return ret;
958
959 ret = 0;
960 while ((len = iov_iter_count(to)) > 0) {
961 struct ceph_osd_request *req;
962 struct page **pages;
963 int num_pages;
964 size_t page_off;
965 bool more;
966 int idx;
967 size_t left;
968
969 req = ceph_osdc_new_request(osdc, &ci->i_layout,
970 ci->i_vino, off, &len, 0, 1,
971 CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ,
972 NULL, ci->i_truncate_seq,
973 ci->i_truncate_size, false);
974 if (IS_ERR(req)) {
975 ret = PTR_ERR(req);
976 break;
977 }
978
979 more = len < iov_iter_count(to);
980
981 num_pages = calc_pages_for(off, len);
982 page_off = off & ~PAGE_MASK;
983 pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL);
984 if (IS_ERR(pages)) {
985 ceph_osdc_put_request(req);
986 ret = PTR_ERR(pages);
987 break;
988 }
989
990 osd_req_op_extent_osd_data_pages(req, 0, pages, len, page_off,
991 false, false);
992 ceph_osdc_start_request(osdc, req);
993 ret = ceph_osdc_wait_request(osdc, req);
994
995 ceph_update_read_metrics(&fsc->mdsc->metric,
996 req->r_start_latency,
997 req->r_end_latency,
998 len, ret);
999
1000 ceph_osdc_put_request(req);
1001
1002 i_size = i_size_read(inode);
1003 dout("sync_read %llu~%llu got %zd i_size %llu%s\n",
1004 off, len, ret, i_size, (more ? " MORE" : ""));
1005
1006 if (ret == -ENOENT)
1007 ret = 0;
1008 if (ret >= 0 && ret < len && (off + ret < i_size)) {
1009 int zlen = min(len - ret, i_size - off - ret);
1010 int zoff = page_off + ret;
1011 dout("sync_read zero gap %llu~%llu\n",
1012 off + ret, off + ret + zlen);
1013 ceph_zero_page_vector_range(zoff, zlen, pages);
1014 ret += zlen;
1015 }
1016
1017 idx = 0;
1018 left = ret > 0 ? ret : 0;
1019 while (left > 0) {
1020 size_t len, copied;
1021 page_off = off & ~PAGE_MASK;
1022 len = min_t(size_t, left, PAGE_SIZE - page_off);
1023 SetPageUptodate(pages[idx]);
1024 copied = copy_page_to_iter(pages[idx++],
1025 page_off, len, to);
1026 off += copied;
1027 left -= copied;
1028 if (copied < len) {
1029 ret = -EFAULT;
1030 break;
1031 }
1032 }
1033 ceph_release_page_vector(pages, num_pages);
1034
1035 if (ret < 0) {
1036 if (ret == -EBLOCKLISTED)
1037 fsc->blocklisted = true;
1038 break;
1039 }
1040
1041 if (off >= i_size || !more)
1042 break;
1043 }
1044
1045 if (off > iocb->ki_pos) {
1046 if (off >= i_size) {
1047 *retry_op = CHECK_EOF;
1048 ret = i_size - iocb->ki_pos;
1049 iocb->ki_pos = i_size;
1050 } else {
1051 ret = off - iocb->ki_pos;
1052 iocb->ki_pos = off;
1053 }
1054 }
1055
1056 dout("sync_read result %zd retry_op %d\n", ret, *retry_op);
1057 return ret;
1058}
1059
1060struct ceph_aio_request {
1061 struct kiocb *iocb;
1062 size_t total_len;
1063 bool write;
1064 bool should_dirty;
1065 int error;
1066 struct list_head osd_reqs;
1067 unsigned num_reqs;
1068 atomic_t pending_reqs;
1069 struct timespec64 mtime;
1070 struct ceph_cap_flush *prealloc_cf;
1071};
1072
1073struct ceph_aio_work {
1074 struct work_struct work;
1075 struct ceph_osd_request *req;
1076};
1077
1078static void ceph_aio_retry_work(struct work_struct *work);
1079
1080static void ceph_aio_complete(struct inode *inode,
1081 struct ceph_aio_request *aio_req)
1082{
1083 struct ceph_inode_info *ci = ceph_inode(inode);
1084 int ret;
1085
1086 if (!atomic_dec_and_test(&aio_req->pending_reqs))
1087 return;
1088
1089 if (aio_req->iocb->ki_flags & IOCB_DIRECT)
1090 inode_dio_end(inode);
1091
1092 ret = aio_req->error;
1093 if (!ret)
1094 ret = aio_req->total_len;
1095
1096 dout("ceph_aio_complete %p rc %d\n", inode, ret);
1097
1098 if (ret >= 0 && aio_req->write) {
1099 int dirty;
1100
1101 loff_t endoff = aio_req->iocb->ki_pos + aio_req->total_len;
1102 if (endoff > i_size_read(inode)) {
1103 if (ceph_inode_set_size(inode, endoff))
1104 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY);
1105 }
1106
1107 spin_lock(&ci->i_ceph_lock);
1108 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
1109 &aio_req->prealloc_cf);
1110 spin_unlock(&ci->i_ceph_lock);
1111 if (dirty)
1112 __mark_inode_dirty(inode, dirty);
1113
1114 }
1115
1116 ceph_put_cap_refs(ci, (aio_req->write ? CEPH_CAP_FILE_WR :
1117 CEPH_CAP_FILE_RD));
1118
1119 aio_req->iocb->ki_complete(aio_req->iocb, ret);
1120
1121 ceph_free_cap_flush(aio_req->prealloc_cf);
1122 kfree(aio_req);
1123}
1124
1125static void ceph_aio_complete_req(struct ceph_osd_request *req)
1126{
1127 int rc = req->r_result;
1128 struct inode *inode = req->r_inode;
1129 struct ceph_aio_request *aio_req = req->r_priv;
1130 struct ceph_osd_data *osd_data = osd_req_op_extent_osd_data(req, 0);
1131 struct ceph_client_metric *metric = &ceph_sb_to_mdsc(inode->i_sb)->metric;
1132 unsigned int len = osd_data->bvec_pos.iter.bi_size;
1133
1134 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_BVECS);
1135 BUG_ON(!osd_data->num_bvecs);
1136
1137 dout("ceph_aio_complete_req %p rc %d bytes %u\n", inode, rc, len);
1138
1139 if (rc == -EOLDSNAPC) {
1140 struct ceph_aio_work *aio_work;
1141 BUG_ON(!aio_req->write);
1142
1143 aio_work = kmalloc(sizeof(*aio_work), GFP_NOFS);
1144 if (aio_work) {
1145 INIT_WORK(&aio_work->work, ceph_aio_retry_work);
1146 aio_work->req = req;
1147 queue_work(ceph_inode_to_client(inode)->inode_wq,
1148 &aio_work->work);
1149 return;
1150 }
1151 rc = -ENOMEM;
1152 } else if (!aio_req->write) {
1153 if (rc == -ENOENT)
1154 rc = 0;
1155 if (rc >= 0 && len > rc) {
1156 struct iov_iter i;
1157 int zlen = len - rc;
1158
1159 /*
1160 * If read is satisfied by single OSD request,
1161 * it can pass EOF. Otherwise read is within
1162 * i_size.
1163 */
1164 if (aio_req->num_reqs == 1) {
1165 loff_t i_size = i_size_read(inode);
1166 loff_t endoff = aio_req->iocb->ki_pos + rc;
1167 if (endoff < i_size)
1168 zlen = min_t(size_t, zlen,
1169 i_size - endoff);
1170 aio_req->total_len = rc + zlen;
1171 }
1172
1173 iov_iter_bvec(&i, ITER_DEST, osd_data->bvec_pos.bvecs,
1174 osd_data->num_bvecs, len);
1175 iov_iter_advance(&i, rc);
1176 iov_iter_zero(zlen, &i);
1177 }
1178 }
1179
1180 /* r_start_latency == 0 means the request was not submitted */
1181 if (req->r_start_latency) {
1182 if (aio_req->write)
1183 ceph_update_write_metrics(metric, req->r_start_latency,
1184 req->r_end_latency, len, rc);
1185 else
1186 ceph_update_read_metrics(metric, req->r_start_latency,
1187 req->r_end_latency, len, rc);
1188 }
1189
1190 put_bvecs(osd_data->bvec_pos.bvecs, osd_data->num_bvecs,
1191 aio_req->should_dirty);
1192 ceph_osdc_put_request(req);
1193
1194 if (rc < 0)
1195 cmpxchg(&aio_req->error, 0, rc);
1196
1197 ceph_aio_complete(inode, aio_req);
1198 return;
1199}
1200
1201static void ceph_aio_retry_work(struct work_struct *work)
1202{
1203 struct ceph_aio_work *aio_work =
1204 container_of(work, struct ceph_aio_work, work);
1205 struct ceph_osd_request *orig_req = aio_work->req;
1206 struct ceph_aio_request *aio_req = orig_req->r_priv;
1207 struct inode *inode = orig_req->r_inode;
1208 struct ceph_inode_info *ci = ceph_inode(inode);
1209 struct ceph_snap_context *snapc;
1210 struct ceph_osd_request *req;
1211 int ret;
1212
1213 spin_lock(&ci->i_ceph_lock);
1214 if (__ceph_have_pending_cap_snap(ci)) {
1215 struct ceph_cap_snap *capsnap =
1216 list_last_entry(&ci->i_cap_snaps,
1217 struct ceph_cap_snap,
1218 ci_item);
1219 snapc = ceph_get_snap_context(capsnap->context);
1220 } else {
1221 BUG_ON(!ci->i_head_snapc);
1222 snapc = ceph_get_snap_context(ci->i_head_snapc);
1223 }
1224 spin_unlock(&ci->i_ceph_lock);
1225
1226 req = ceph_osdc_alloc_request(orig_req->r_osdc, snapc, 1,
1227 false, GFP_NOFS);
1228 if (!req) {
1229 ret = -ENOMEM;
1230 req = orig_req;
1231 goto out;
1232 }
1233
1234 req->r_flags = /* CEPH_OSD_FLAG_ORDERSNAP | */ CEPH_OSD_FLAG_WRITE;
1235 ceph_oloc_copy(&req->r_base_oloc, &orig_req->r_base_oloc);
1236 ceph_oid_copy(&req->r_base_oid, &orig_req->r_base_oid);
1237
1238 req->r_ops[0] = orig_req->r_ops[0];
1239
1240 req->r_mtime = aio_req->mtime;
1241 req->r_data_offset = req->r_ops[0].extent.offset;
1242
1243 ret = ceph_osdc_alloc_messages(req, GFP_NOFS);
1244 if (ret) {
1245 ceph_osdc_put_request(req);
1246 req = orig_req;
1247 goto out;
1248 }
1249
1250 ceph_osdc_put_request(orig_req);
1251
1252 req->r_callback = ceph_aio_complete_req;
1253 req->r_inode = inode;
1254 req->r_priv = aio_req;
1255
1256 ceph_osdc_start_request(req->r_osdc, req);
1257out:
1258 if (ret < 0) {
1259 req->r_result = ret;
1260 ceph_aio_complete_req(req);
1261 }
1262
1263 ceph_put_snap_context(snapc);
1264 kfree(aio_work);
1265}
1266
1267static ssize_t
1268ceph_direct_read_write(struct kiocb *iocb, struct iov_iter *iter,
1269 struct ceph_snap_context *snapc,
1270 struct ceph_cap_flush **pcf)
1271{
1272 struct file *file = iocb->ki_filp;
1273 struct inode *inode = file_inode(file);
1274 struct ceph_inode_info *ci = ceph_inode(inode);
1275 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1276 struct ceph_client_metric *metric = &fsc->mdsc->metric;
1277 struct ceph_vino vino;
1278 struct ceph_osd_request *req;
1279 struct bio_vec *bvecs;
1280 struct ceph_aio_request *aio_req = NULL;
1281 int num_pages = 0;
1282 int flags;
1283 int ret = 0;
1284 struct timespec64 mtime = current_time(inode);
1285 size_t count = iov_iter_count(iter);
1286 loff_t pos = iocb->ki_pos;
1287 bool write = iov_iter_rw(iter) == WRITE;
1288 bool should_dirty = !write && user_backed_iter(iter);
1289
1290 if (write && ceph_snap(file_inode(file)) != CEPH_NOSNAP)
1291 return -EROFS;
1292
1293 dout("sync_direct_%s on file %p %lld~%u snapc %p seq %lld\n",
1294 (write ? "write" : "read"), file, pos, (unsigned)count,
1295 snapc, snapc ? snapc->seq : 0);
1296
1297 if (write) {
1298 int ret2;
1299
1300 ceph_fscache_invalidate(inode, true);
1301
1302 ret2 = invalidate_inode_pages2_range(inode->i_mapping,
1303 pos >> PAGE_SHIFT,
1304 (pos + count - 1) >> PAGE_SHIFT);
1305 if (ret2 < 0)
1306 dout("invalidate_inode_pages2_range returned %d\n", ret2);
1307
1308 flags = /* CEPH_OSD_FLAG_ORDERSNAP | */ CEPH_OSD_FLAG_WRITE;
1309 } else {
1310 flags = CEPH_OSD_FLAG_READ;
1311 }
1312
1313 while (iov_iter_count(iter) > 0) {
1314 u64 size = iov_iter_count(iter);
1315 ssize_t len;
1316
1317 if (write)
1318 size = min_t(u64, size, fsc->mount_options->wsize);
1319 else
1320 size = min_t(u64, size, fsc->mount_options->rsize);
1321
1322 vino = ceph_vino(inode);
1323 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1324 vino, pos, &size, 0,
1325 1,
1326 write ? CEPH_OSD_OP_WRITE :
1327 CEPH_OSD_OP_READ,
1328 flags, snapc,
1329 ci->i_truncate_seq,
1330 ci->i_truncate_size,
1331 false);
1332 if (IS_ERR(req)) {
1333 ret = PTR_ERR(req);
1334 break;
1335 }
1336
1337 len = iter_get_bvecs_alloc(iter, size, &bvecs, &num_pages);
1338 if (len < 0) {
1339 ceph_osdc_put_request(req);
1340 ret = len;
1341 break;
1342 }
1343 if (len != size)
1344 osd_req_op_extent_update(req, 0, len);
1345
1346 /*
1347 * To simplify error handling, allow AIO when IO within i_size
1348 * or IO can be satisfied by single OSD request.
1349 */
1350 if (pos == iocb->ki_pos && !is_sync_kiocb(iocb) &&
1351 (len == count || pos + count <= i_size_read(inode))) {
1352 aio_req = kzalloc(sizeof(*aio_req), GFP_KERNEL);
1353 if (aio_req) {
1354 aio_req->iocb = iocb;
1355 aio_req->write = write;
1356 aio_req->should_dirty = should_dirty;
1357 INIT_LIST_HEAD(&aio_req->osd_reqs);
1358 if (write) {
1359 aio_req->mtime = mtime;
1360 swap(aio_req->prealloc_cf, *pcf);
1361 }
1362 }
1363 /* ignore error */
1364 }
1365
1366 if (write) {
1367 /*
1368 * throw out any page cache pages in this range. this
1369 * may block.
1370 */
1371 truncate_inode_pages_range(inode->i_mapping, pos,
1372 PAGE_ALIGN(pos + len) - 1);
1373
1374 req->r_mtime = mtime;
1375 }
1376
1377 osd_req_op_extent_osd_data_bvecs(req, 0, bvecs, num_pages, len);
1378
1379 if (aio_req) {
1380 aio_req->total_len += len;
1381 aio_req->num_reqs++;
1382 atomic_inc(&aio_req->pending_reqs);
1383
1384 req->r_callback = ceph_aio_complete_req;
1385 req->r_inode = inode;
1386 req->r_priv = aio_req;
1387 list_add_tail(&req->r_private_item, &aio_req->osd_reqs);
1388
1389 pos += len;
1390 continue;
1391 }
1392
1393 ceph_osdc_start_request(req->r_osdc, req);
1394 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
1395
1396 if (write)
1397 ceph_update_write_metrics(metric, req->r_start_latency,
1398 req->r_end_latency, len, ret);
1399 else
1400 ceph_update_read_metrics(metric, req->r_start_latency,
1401 req->r_end_latency, len, ret);
1402
1403 size = i_size_read(inode);
1404 if (!write) {
1405 if (ret == -ENOENT)
1406 ret = 0;
1407 if (ret >= 0 && ret < len && pos + ret < size) {
1408 struct iov_iter i;
1409 int zlen = min_t(size_t, len - ret,
1410 size - pos - ret);
1411
1412 iov_iter_bvec(&i, ITER_DEST, bvecs, num_pages, len);
1413 iov_iter_advance(&i, ret);
1414 iov_iter_zero(zlen, &i);
1415 ret += zlen;
1416 }
1417 if (ret >= 0)
1418 len = ret;
1419 }
1420
1421 put_bvecs(bvecs, num_pages, should_dirty);
1422 ceph_osdc_put_request(req);
1423 if (ret < 0)
1424 break;
1425
1426 pos += len;
1427 if (!write && pos >= size)
1428 break;
1429
1430 if (write && pos > size) {
1431 if (ceph_inode_set_size(inode, pos))
1432 ceph_check_caps(ceph_inode(inode),
1433 CHECK_CAPS_AUTHONLY);
1434 }
1435 }
1436
1437 if (aio_req) {
1438 LIST_HEAD(osd_reqs);
1439
1440 if (aio_req->num_reqs == 0) {
1441 kfree(aio_req);
1442 return ret;
1443 }
1444
1445 ceph_get_cap_refs(ci, write ? CEPH_CAP_FILE_WR :
1446 CEPH_CAP_FILE_RD);
1447
1448 list_splice(&aio_req->osd_reqs, &osd_reqs);
1449 inode_dio_begin(inode);
1450 while (!list_empty(&osd_reqs)) {
1451 req = list_first_entry(&osd_reqs,
1452 struct ceph_osd_request,
1453 r_private_item);
1454 list_del_init(&req->r_private_item);
1455 if (ret >= 0)
1456 ceph_osdc_start_request(req->r_osdc, req);
1457 if (ret < 0) {
1458 req->r_result = ret;
1459 ceph_aio_complete_req(req);
1460 }
1461 }
1462 return -EIOCBQUEUED;
1463 }
1464
1465 if (ret != -EOLDSNAPC && pos > iocb->ki_pos) {
1466 ret = pos - iocb->ki_pos;
1467 iocb->ki_pos = pos;
1468 }
1469 return ret;
1470}
1471
1472/*
1473 * Synchronous write, straight from __user pointer or user pages.
1474 *
1475 * If write spans object boundary, just do multiple writes. (For a
1476 * correct atomic write, we should e.g. take write locks on all
1477 * objects, rollback on failure, etc.)
1478 */
1479static ssize_t
1480ceph_sync_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos,
1481 struct ceph_snap_context *snapc)
1482{
1483 struct file *file = iocb->ki_filp;
1484 struct inode *inode = file_inode(file);
1485 struct ceph_inode_info *ci = ceph_inode(inode);
1486 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1487 struct ceph_vino vino;
1488 struct ceph_osd_request *req;
1489 struct page **pages;
1490 u64 len;
1491 int num_pages;
1492 int written = 0;
1493 int flags;
1494 int ret;
1495 bool check_caps = false;
1496 struct timespec64 mtime = current_time(inode);
1497 size_t count = iov_iter_count(from);
1498
1499 if (ceph_snap(file_inode(file)) != CEPH_NOSNAP)
1500 return -EROFS;
1501
1502 dout("sync_write on file %p %lld~%u snapc %p seq %lld\n",
1503 file, pos, (unsigned)count, snapc, snapc->seq);
1504
1505 ret = filemap_write_and_wait_range(inode->i_mapping,
1506 pos, pos + count - 1);
1507 if (ret < 0)
1508 return ret;
1509
1510 ceph_fscache_invalidate(inode, false);
1511 ret = invalidate_inode_pages2_range(inode->i_mapping,
1512 pos >> PAGE_SHIFT,
1513 (pos + count - 1) >> PAGE_SHIFT);
1514 if (ret < 0)
1515 dout("invalidate_inode_pages2_range returned %d\n", ret);
1516
1517 flags = /* CEPH_OSD_FLAG_ORDERSNAP | */ CEPH_OSD_FLAG_WRITE;
1518
1519 while ((len = iov_iter_count(from)) > 0) {
1520 size_t left;
1521 int n;
1522
1523 vino = ceph_vino(inode);
1524 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1525 vino, pos, &len, 0, 1,
1526 CEPH_OSD_OP_WRITE, flags, snapc,
1527 ci->i_truncate_seq,
1528 ci->i_truncate_size,
1529 false);
1530 if (IS_ERR(req)) {
1531 ret = PTR_ERR(req);
1532 break;
1533 }
1534
1535 /*
1536 * write from beginning of first page,
1537 * regardless of io alignment
1538 */
1539 num_pages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
1540
1541 pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL);
1542 if (IS_ERR(pages)) {
1543 ret = PTR_ERR(pages);
1544 goto out;
1545 }
1546
1547 left = len;
1548 for (n = 0; n < num_pages; n++) {
1549 size_t plen = min_t(size_t, left, PAGE_SIZE);
1550 ret = copy_page_from_iter(pages[n], 0, plen, from);
1551 if (ret != plen) {
1552 ret = -EFAULT;
1553 break;
1554 }
1555 left -= ret;
1556 }
1557
1558 if (ret < 0) {
1559 ceph_release_page_vector(pages, num_pages);
1560 goto out;
1561 }
1562
1563 req->r_inode = inode;
1564
1565 osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0,
1566 false, true);
1567
1568 req->r_mtime = mtime;
1569 ceph_osdc_start_request(&fsc->client->osdc, req);
1570 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
1571
1572 ceph_update_write_metrics(&fsc->mdsc->metric, req->r_start_latency,
1573 req->r_end_latency, len, ret);
1574out:
1575 ceph_osdc_put_request(req);
1576 if (ret != 0) {
1577 ceph_set_error_write(ci);
1578 break;
1579 }
1580
1581 ceph_clear_error_write(ci);
1582 pos += len;
1583 written += len;
1584 if (pos > i_size_read(inode)) {
1585 check_caps = ceph_inode_set_size(inode, pos);
1586 if (check_caps)
1587 ceph_check_caps(ceph_inode(inode),
1588 CHECK_CAPS_AUTHONLY);
1589 }
1590
1591 }
1592
1593 if (ret != -EOLDSNAPC && written > 0) {
1594 ret = written;
1595 iocb->ki_pos = pos;
1596 }
1597 return ret;
1598}
1599
1600/*
1601 * Wrap generic_file_aio_read with checks for cap bits on the inode.
1602 * Atomically grab references, so that those bits are not released
1603 * back to the MDS mid-read.
1604 *
1605 * Hmm, the sync read case isn't actually async... should it be?
1606 */
1607static ssize_t ceph_read_iter(struct kiocb *iocb, struct iov_iter *to)
1608{
1609 struct file *filp = iocb->ki_filp;
1610 struct ceph_file_info *fi = filp->private_data;
1611 size_t len = iov_iter_count(to);
1612 struct inode *inode = file_inode(filp);
1613 struct ceph_inode_info *ci = ceph_inode(inode);
1614 bool direct_lock = iocb->ki_flags & IOCB_DIRECT;
1615 ssize_t ret;
1616 int want = 0, got = 0;
1617 int retry_op = 0, read = 0;
1618
1619again:
1620 dout("aio_read %p %llx.%llx %llu~%u trying to get caps on %p\n",
1621 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len, inode);
1622
1623 if (ceph_inode_is_shutdown(inode))
1624 return -ESTALE;
1625
1626 if (direct_lock)
1627 ceph_start_io_direct(inode);
1628 else
1629 ceph_start_io_read(inode);
1630
1631 if (!(fi->flags & CEPH_F_SYNC) && !direct_lock)
1632 want |= CEPH_CAP_FILE_CACHE;
1633 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1634 want |= CEPH_CAP_FILE_LAZYIO;
1635
1636 ret = ceph_get_caps(filp, CEPH_CAP_FILE_RD, want, -1, &got);
1637 if (ret < 0) {
1638 if (direct_lock)
1639 ceph_end_io_direct(inode);
1640 else
1641 ceph_end_io_read(inode);
1642 return ret;
1643 }
1644
1645 if ((got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0 ||
1646 (iocb->ki_flags & IOCB_DIRECT) ||
1647 (fi->flags & CEPH_F_SYNC)) {
1648
1649 dout("aio_sync_read %p %llx.%llx %llu~%u got cap refs on %s\n",
1650 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
1651 ceph_cap_string(got));
1652
1653 if (!ceph_has_inline_data(ci)) {
1654 if (!retry_op && (iocb->ki_flags & IOCB_DIRECT)) {
1655 ret = ceph_direct_read_write(iocb, to,
1656 NULL, NULL);
1657 if (ret >= 0 && ret < len)
1658 retry_op = CHECK_EOF;
1659 } else {
1660 ret = ceph_sync_read(iocb, to, &retry_op);
1661 }
1662 } else {
1663 retry_op = READ_INLINE;
1664 }
1665 } else {
1666 CEPH_DEFINE_RW_CONTEXT(rw_ctx, got);
1667 dout("aio_read %p %llx.%llx %llu~%u got cap refs on %s\n",
1668 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
1669 ceph_cap_string(got));
1670 ceph_add_rw_context(fi, &rw_ctx);
1671 ret = generic_file_read_iter(iocb, to);
1672 ceph_del_rw_context(fi, &rw_ctx);
1673 }
1674
1675 dout("aio_read %p %llx.%llx dropping cap refs on %s = %d\n",
1676 inode, ceph_vinop(inode), ceph_cap_string(got), (int)ret);
1677 ceph_put_cap_refs(ci, got);
1678
1679 if (direct_lock)
1680 ceph_end_io_direct(inode);
1681 else
1682 ceph_end_io_read(inode);
1683
1684 if (retry_op > HAVE_RETRIED && ret >= 0) {
1685 int statret;
1686 struct page *page = NULL;
1687 loff_t i_size;
1688 if (retry_op == READ_INLINE) {
1689 page = __page_cache_alloc(GFP_KERNEL);
1690 if (!page)
1691 return -ENOMEM;
1692 }
1693
1694 statret = __ceph_do_getattr(inode, page,
1695 CEPH_STAT_CAP_INLINE_DATA, !!page);
1696 if (statret < 0) {
1697 if (page)
1698 __free_page(page);
1699 if (statret == -ENODATA) {
1700 BUG_ON(retry_op != READ_INLINE);
1701 goto again;
1702 }
1703 return statret;
1704 }
1705
1706 i_size = i_size_read(inode);
1707 if (retry_op == READ_INLINE) {
1708 BUG_ON(ret > 0 || read > 0);
1709 if (iocb->ki_pos < i_size &&
1710 iocb->ki_pos < PAGE_SIZE) {
1711 loff_t end = min_t(loff_t, i_size,
1712 iocb->ki_pos + len);
1713 end = min_t(loff_t, end, PAGE_SIZE);
1714 if (statret < end)
1715 zero_user_segment(page, statret, end);
1716 ret = copy_page_to_iter(page,
1717 iocb->ki_pos & ~PAGE_MASK,
1718 end - iocb->ki_pos, to);
1719 iocb->ki_pos += ret;
1720 read += ret;
1721 }
1722 if (iocb->ki_pos < i_size && read < len) {
1723 size_t zlen = min_t(size_t, len - read,
1724 i_size - iocb->ki_pos);
1725 ret = iov_iter_zero(zlen, to);
1726 iocb->ki_pos += ret;
1727 read += ret;
1728 }
1729 __free_pages(page, 0);
1730 return read;
1731 }
1732
1733 /* hit EOF or hole? */
1734 if (retry_op == CHECK_EOF && iocb->ki_pos < i_size &&
1735 ret < len) {
1736 dout("sync_read hit hole, ppos %lld < size %lld"
1737 ", reading more\n", iocb->ki_pos, i_size);
1738
1739 read += ret;
1740 len -= ret;
1741 retry_op = HAVE_RETRIED;
1742 goto again;
1743 }
1744 }
1745
1746 if (ret >= 0)
1747 ret += read;
1748
1749 return ret;
1750}
1751
1752/*
1753 * Take cap references to avoid releasing caps to MDS mid-write.
1754 *
1755 * If we are synchronous, and write with an old snap context, the OSD
1756 * may return EOLDSNAPC. In that case, retry the write.. _after_
1757 * dropping our cap refs and allowing the pending snap to logically
1758 * complete _before_ this write occurs.
1759 *
1760 * If we are near ENOSPC, write synchronously.
1761 */
1762static ssize_t ceph_write_iter(struct kiocb *iocb, struct iov_iter *from)
1763{
1764 struct file *file = iocb->ki_filp;
1765 struct ceph_file_info *fi = file->private_data;
1766 struct inode *inode = file_inode(file);
1767 struct ceph_inode_info *ci = ceph_inode(inode);
1768 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1769 struct ceph_osd_client *osdc = &fsc->client->osdc;
1770 struct ceph_cap_flush *prealloc_cf;
1771 ssize_t count, written = 0;
1772 int err, want = 0, got;
1773 bool direct_lock = false;
1774 u32 map_flags;
1775 u64 pool_flags;
1776 loff_t pos;
1777 loff_t limit = max(i_size_read(inode), fsc->max_file_size);
1778
1779 if (ceph_inode_is_shutdown(inode))
1780 return -ESTALE;
1781
1782 if (ceph_snap(inode) != CEPH_NOSNAP)
1783 return -EROFS;
1784
1785 prealloc_cf = ceph_alloc_cap_flush();
1786 if (!prealloc_cf)
1787 return -ENOMEM;
1788
1789 if ((iocb->ki_flags & (IOCB_DIRECT | IOCB_APPEND)) == IOCB_DIRECT)
1790 direct_lock = true;
1791
1792retry_snap:
1793 if (direct_lock)
1794 ceph_start_io_direct(inode);
1795 else
1796 ceph_start_io_write(inode);
1797
1798 /* We can write back this queue in page reclaim */
1799 current->backing_dev_info = inode_to_bdi(inode);
1800
1801 if (iocb->ki_flags & IOCB_APPEND) {
1802 err = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false);
1803 if (err < 0)
1804 goto out;
1805 }
1806
1807 err = generic_write_checks(iocb, from);
1808 if (err <= 0)
1809 goto out;
1810
1811 pos = iocb->ki_pos;
1812 if (unlikely(pos >= limit)) {
1813 err = -EFBIG;
1814 goto out;
1815 } else {
1816 iov_iter_truncate(from, limit - pos);
1817 }
1818
1819 count = iov_iter_count(from);
1820 if (ceph_quota_is_max_bytes_exceeded(inode, pos + count)) {
1821 err = -EDQUOT;
1822 goto out;
1823 }
1824
1825 down_read(&osdc->lock);
1826 map_flags = osdc->osdmap->flags;
1827 pool_flags = ceph_pg_pool_flags(osdc->osdmap, ci->i_layout.pool_id);
1828 up_read(&osdc->lock);
1829 if ((map_flags & CEPH_OSDMAP_FULL) ||
1830 (pool_flags & CEPH_POOL_FLAG_FULL)) {
1831 err = -ENOSPC;
1832 goto out;
1833 }
1834
1835 err = file_remove_privs(file);
1836 if (err)
1837 goto out;
1838
1839 dout("aio_write %p %llx.%llx %llu~%zd getting caps. i_size %llu\n",
1840 inode, ceph_vinop(inode), pos, count, i_size_read(inode));
1841 if (!(fi->flags & CEPH_F_SYNC) && !direct_lock)
1842 want |= CEPH_CAP_FILE_BUFFER;
1843 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1844 want |= CEPH_CAP_FILE_LAZYIO;
1845 got = 0;
1846 err = ceph_get_caps(file, CEPH_CAP_FILE_WR, want, pos + count, &got);
1847 if (err < 0)
1848 goto out;
1849
1850 err = file_update_time(file);
1851 if (err)
1852 goto out_caps;
1853
1854 inode_inc_iversion_raw(inode);
1855
1856 dout("aio_write %p %llx.%llx %llu~%zd got cap refs on %s\n",
1857 inode, ceph_vinop(inode), pos, count, ceph_cap_string(got));
1858
1859 if ((got & (CEPH_CAP_FILE_BUFFER|CEPH_CAP_FILE_LAZYIO)) == 0 ||
1860 (iocb->ki_flags & IOCB_DIRECT) || (fi->flags & CEPH_F_SYNC) ||
1861 (ci->i_ceph_flags & CEPH_I_ERROR_WRITE)) {
1862 struct ceph_snap_context *snapc;
1863 struct iov_iter data;
1864
1865 spin_lock(&ci->i_ceph_lock);
1866 if (__ceph_have_pending_cap_snap(ci)) {
1867 struct ceph_cap_snap *capsnap =
1868 list_last_entry(&ci->i_cap_snaps,
1869 struct ceph_cap_snap,
1870 ci_item);
1871 snapc = ceph_get_snap_context(capsnap->context);
1872 } else {
1873 BUG_ON(!ci->i_head_snapc);
1874 snapc = ceph_get_snap_context(ci->i_head_snapc);
1875 }
1876 spin_unlock(&ci->i_ceph_lock);
1877
1878 /* we might need to revert back to that point */
1879 data = *from;
1880 if (iocb->ki_flags & IOCB_DIRECT)
1881 written = ceph_direct_read_write(iocb, &data, snapc,
1882 &prealloc_cf);
1883 else
1884 written = ceph_sync_write(iocb, &data, pos, snapc);
1885 if (direct_lock)
1886 ceph_end_io_direct(inode);
1887 else
1888 ceph_end_io_write(inode);
1889 if (written > 0)
1890 iov_iter_advance(from, written);
1891 ceph_put_snap_context(snapc);
1892 } else {
1893 /*
1894 * No need to acquire the i_truncate_mutex. Because
1895 * the MDS revokes Fwb caps before sending truncate
1896 * message to us. We can't get Fwb cap while there
1897 * are pending vmtruncate. So write and vmtruncate
1898 * can not run at the same time
1899 */
1900 written = generic_perform_write(iocb, from);
1901 if (likely(written >= 0))
1902 iocb->ki_pos = pos + written;
1903 ceph_end_io_write(inode);
1904 }
1905
1906 if (written >= 0) {
1907 int dirty;
1908
1909 spin_lock(&ci->i_ceph_lock);
1910 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
1911 &prealloc_cf);
1912 spin_unlock(&ci->i_ceph_lock);
1913 if (dirty)
1914 __mark_inode_dirty(inode, dirty);
1915 if (ceph_quota_is_max_bytes_approaching(inode, iocb->ki_pos))
1916 ceph_check_caps(ci, CHECK_CAPS_FLUSH);
1917 }
1918
1919 dout("aio_write %p %llx.%llx %llu~%u dropping cap refs on %s\n",
1920 inode, ceph_vinop(inode), pos, (unsigned)count,
1921 ceph_cap_string(got));
1922 ceph_put_cap_refs(ci, got);
1923
1924 if (written == -EOLDSNAPC) {
1925 dout("aio_write %p %llx.%llx %llu~%u" "got EOLDSNAPC, retrying\n",
1926 inode, ceph_vinop(inode), pos, (unsigned)count);
1927 goto retry_snap;
1928 }
1929
1930 if (written >= 0) {
1931 if ((map_flags & CEPH_OSDMAP_NEARFULL) ||
1932 (pool_flags & CEPH_POOL_FLAG_NEARFULL))
1933 iocb->ki_flags |= IOCB_DSYNC;
1934 written = generic_write_sync(iocb, written);
1935 }
1936
1937 goto out_unlocked;
1938out_caps:
1939 ceph_put_cap_refs(ci, got);
1940out:
1941 if (direct_lock)
1942 ceph_end_io_direct(inode);
1943 else
1944 ceph_end_io_write(inode);
1945out_unlocked:
1946 ceph_free_cap_flush(prealloc_cf);
1947 current->backing_dev_info = NULL;
1948 return written ? written : err;
1949}
1950
1951/*
1952 * llseek. be sure to verify file size on SEEK_END.
1953 */
1954static loff_t ceph_llseek(struct file *file, loff_t offset, int whence)
1955{
1956 if (whence == SEEK_END || whence == SEEK_DATA || whence == SEEK_HOLE) {
1957 struct inode *inode = file_inode(file);
1958 int ret;
1959
1960 ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false);
1961 if (ret < 0)
1962 return ret;
1963 }
1964 return generic_file_llseek(file, offset, whence);
1965}
1966
1967static inline void ceph_zero_partial_page(
1968 struct inode *inode, loff_t offset, unsigned size)
1969{
1970 struct page *page;
1971 pgoff_t index = offset >> PAGE_SHIFT;
1972
1973 page = find_lock_page(inode->i_mapping, index);
1974 if (page) {
1975 wait_on_page_writeback(page);
1976 zero_user(page, offset & (PAGE_SIZE - 1), size);
1977 unlock_page(page);
1978 put_page(page);
1979 }
1980}
1981
1982static void ceph_zero_pagecache_range(struct inode *inode, loff_t offset,
1983 loff_t length)
1984{
1985 loff_t nearly = round_up(offset, PAGE_SIZE);
1986 if (offset < nearly) {
1987 loff_t size = nearly - offset;
1988 if (length < size)
1989 size = length;
1990 ceph_zero_partial_page(inode, offset, size);
1991 offset += size;
1992 length -= size;
1993 }
1994 if (length >= PAGE_SIZE) {
1995 loff_t size = round_down(length, PAGE_SIZE);
1996 truncate_pagecache_range(inode, offset, offset + size - 1);
1997 offset += size;
1998 length -= size;
1999 }
2000 if (length)
2001 ceph_zero_partial_page(inode, offset, length);
2002}
2003
2004static int ceph_zero_partial_object(struct inode *inode,
2005 loff_t offset, loff_t *length)
2006{
2007 struct ceph_inode_info *ci = ceph_inode(inode);
2008 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
2009 struct ceph_osd_request *req;
2010 int ret = 0;
2011 loff_t zero = 0;
2012 int op;
2013
2014 if (ceph_inode_is_shutdown(inode))
2015 return -EIO;
2016
2017 if (!length) {
2018 op = offset ? CEPH_OSD_OP_DELETE : CEPH_OSD_OP_TRUNCATE;
2019 length = &zero;
2020 } else {
2021 op = CEPH_OSD_OP_ZERO;
2022 }
2023
2024 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
2025 ceph_vino(inode),
2026 offset, length,
2027 0, 1, op,
2028 CEPH_OSD_FLAG_WRITE,
2029 NULL, 0, 0, false);
2030 if (IS_ERR(req)) {
2031 ret = PTR_ERR(req);
2032 goto out;
2033 }
2034
2035 req->r_mtime = inode->i_mtime;
2036 ceph_osdc_start_request(&fsc->client->osdc, req);
2037 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
2038 if (ret == -ENOENT)
2039 ret = 0;
2040 ceph_osdc_put_request(req);
2041
2042out:
2043 return ret;
2044}
2045
2046static int ceph_zero_objects(struct inode *inode, loff_t offset, loff_t length)
2047{
2048 int ret = 0;
2049 struct ceph_inode_info *ci = ceph_inode(inode);
2050 s32 stripe_unit = ci->i_layout.stripe_unit;
2051 s32 stripe_count = ci->i_layout.stripe_count;
2052 s32 object_size = ci->i_layout.object_size;
2053 u64 object_set_size = object_size * stripe_count;
2054 u64 nearly, t;
2055
2056 /* round offset up to next period boundary */
2057 nearly = offset + object_set_size - 1;
2058 t = nearly;
2059 nearly -= do_div(t, object_set_size);
2060
2061 while (length && offset < nearly) {
2062 loff_t size = length;
2063 ret = ceph_zero_partial_object(inode, offset, &size);
2064 if (ret < 0)
2065 return ret;
2066 offset += size;
2067 length -= size;
2068 }
2069 while (length >= object_set_size) {
2070 int i;
2071 loff_t pos = offset;
2072 for (i = 0; i < stripe_count; ++i) {
2073 ret = ceph_zero_partial_object(inode, pos, NULL);
2074 if (ret < 0)
2075 return ret;
2076 pos += stripe_unit;
2077 }
2078 offset += object_set_size;
2079 length -= object_set_size;
2080 }
2081 while (length) {
2082 loff_t size = length;
2083 ret = ceph_zero_partial_object(inode, offset, &size);
2084 if (ret < 0)
2085 return ret;
2086 offset += size;
2087 length -= size;
2088 }
2089 return ret;
2090}
2091
2092static long ceph_fallocate(struct file *file, int mode,
2093 loff_t offset, loff_t length)
2094{
2095 struct ceph_file_info *fi = file->private_data;
2096 struct inode *inode = file_inode(file);
2097 struct ceph_inode_info *ci = ceph_inode(inode);
2098 struct ceph_cap_flush *prealloc_cf;
2099 int want, got = 0;
2100 int dirty;
2101 int ret = 0;
2102 loff_t endoff = 0;
2103 loff_t size;
2104
2105 if (mode != (FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
2106 return -EOPNOTSUPP;
2107
2108 if (!S_ISREG(inode->i_mode))
2109 return -EOPNOTSUPP;
2110
2111 prealloc_cf = ceph_alloc_cap_flush();
2112 if (!prealloc_cf)
2113 return -ENOMEM;
2114
2115 inode_lock(inode);
2116
2117 if (ceph_snap(inode) != CEPH_NOSNAP) {
2118 ret = -EROFS;
2119 goto unlock;
2120 }
2121
2122 size = i_size_read(inode);
2123
2124 /* Are we punching a hole beyond EOF? */
2125 if (offset >= size)
2126 goto unlock;
2127 if ((offset + length) > size)
2128 length = size - offset;
2129
2130 if (fi->fmode & CEPH_FILE_MODE_LAZY)
2131 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
2132 else
2133 want = CEPH_CAP_FILE_BUFFER;
2134
2135 ret = ceph_get_caps(file, CEPH_CAP_FILE_WR, want, endoff, &got);
2136 if (ret < 0)
2137 goto unlock;
2138
2139 filemap_invalidate_lock(inode->i_mapping);
2140 ceph_fscache_invalidate(inode, false);
2141 ceph_zero_pagecache_range(inode, offset, length);
2142 ret = ceph_zero_objects(inode, offset, length);
2143
2144 if (!ret) {
2145 spin_lock(&ci->i_ceph_lock);
2146 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
2147 &prealloc_cf);
2148 spin_unlock(&ci->i_ceph_lock);
2149 if (dirty)
2150 __mark_inode_dirty(inode, dirty);
2151 }
2152 filemap_invalidate_unlock(inode->i_mapping);
2153
2154 ceph_put_cap_refs(ci, got);
2155unlock:
2156 inode_unlock(inode);
2157 ceph_free_cap_flush(prealloc_cf);
2158 return ret;
2159}
2160
2161/*
2162 * This function tries to get FILE_WR capabilities for dst_ci and FILE_RD for
2163 * src_ci. Two attempts are made to obtain both caps, and an error is return if
2164 * this fails; zero is returned on success.
2165 */
2166static int get_rd_wr_caps(struct file *src_filp, int *src_got,
2167 struct file *dst_filp,
2168 loff_t dst_endoff, int *dst_got)
2169{
2170 int ret = 0;
2171 bool retrying = false;
2172
2173retry_caps:
2174 ret = ceph_get_caps(dst_filp, CEPH_CAP_FILE_WR, CEPH_CAP_FILE_BUFFER,
2175 dst_endoff, dst_got);
2176 if (ret < 0)
2177 return ret;
2178
2179 /*
2180 * Since we're already holding the FILE_WR capability for the dst file,
2181 * we would risk a deadlock by using ceph_get_caps. Thus, we'll do some
2182 * retry dance instead to try to get both capabilities.
2183 */
2184 ret = ceph_try_get_caps(file_inode(src_filp),
2185 CEPH_CAP_FILE_RD, CEPH_CAP_FILE_SHARED,
2186 false, src_got);
2187 if (ret <= 0) {
2188 /* Start by dropping dst_ci caps and getting src_ci caps */
2189 ceph_put_cap_refs(ceph_inode(file_inode(dst_filp)), *dst_got);
2190 if (retrying) {
2191 if (!ret)
2192 /* ceph_try_get_caps masks EAGAIN */
2193 ret = -EAGAIN;
2194 return ret;
2195 }
2196 ret = ceph_get_caps(src_filp, CEPH_CAP_FILE_RD,
2197 CEPH_CAP_FILE_SHARED, -1, src_got);
2198 if (ret < 0)
2199 return ret;
2200 /*... drop src_ci caps too, and retry */
2201 ceph_put_cap_refs(ceph_inode(file_inode(src_filp)), *src_got);
2202 retrying = true;
2203 goto retry_caps;
2204 }
2205 return ret;
2206}
2207
2208static void put_rd_wr_caps(struct ceph_inode_info *src_ci, int src_got,
2209 struct ceph_inode_info *dst_ci, int dst_got)
2210{
2211 ceph_put_cap_refs(src_ci, src_got);
2212 ceph_put_cap_refs(dst_ci, dst_got);
2213}
2214
2215/*
2216 * This function does several size-related checks, returning an error if:
2217 * - source file is smaller than off+len
2218 * - destination file size is not OK (inode_newsize_ok())
2219 * - max bytes quotas is exceeded
2220 */
2221static int is_file_size_ok(struct inode *src_inode, struct inode *dst_inode,
2222 loff_t src_off, loff_t dst_off, size_t len)
2223{
2224 loff_t size, endoff;
2225
2226 size = i_size_read(src_inode);
2227 /*
2228 * Don't copy beyond source file EOF. Instead of simply setting length
2229 * to (size - src_off), just drop to VFS default implementation, as the
2230 * local i_size may be stale due to other clients writing to the source
2231 * inode.
2232 */
2233 if (src_off + len > size) {
2234 dout("Copy beyond EOF (%llu + %zu > %llu)\n",
2235 src_off, len, size);
2236 return -EOPNOTSUPP;
2237 }
2238 size = i_size_read(dst_inode);
2239
2240 endoff = dst_off + len;
2241 if (inode_newsize_ok(dst_inode, endoff))
2242 return -EOPNOTSUPP;
2243
2244 if (ceph_quota_is_max_bytes_exceeded(dst_inode, endoff))
2245 return -EDQUOT;
2246
2247 return 0;
2248}
2249
2250static struct ceph_osd_request *
2251ceph_alloc_copyfrom_request(struct ceph_osd_client *osdc,
2252 u64 src_snapid,
2253 struct ceph_object_id *src_oid,
2254 struct ceph_object_locator *src_oloc,
2255 struct ceph_object_id *dst_oid,
2256 struct ceph_object_locator *dst_oloc,
2257 u32 truncate_seq, u64 truncate_size)
2258{
2259 struct ceph_osd_request *req;
2260 int ret;
2261 u32 src_fadvise_flags =
2262 CEPH_OSD_OP_FLAG_FADVISE_SEQUENTIAL |
2263 CEPH_OSD_OP_FLAG_FADVISE_NOCACHE;
2264 u32 dst_fadvise_flags =
2265 CEPH_OSD_OP_FLAG_FADVISE_SEQUENTIAL |
2266 CEPH_OSD_OP_FLAG_FADVISE_DONTNEED;
2267
2268 req = ceph_osdc_alloc_request(osdc, NULL, 1, false, GFP_KERNEL);
2269 if (!req)
2270 return ERR_PTR(-ENOMEM);
2271
2272 req->r_flags = CEPH_OSD_FLAG_WRITE;
2273
2274 ceph_oloc_copy(&req->r_t.base_oloc, dst_oloc);
2275 ceph_oid_copy(&req->r_t.base_oid, dst_oid);
2276
2277 ret = osd_req_op_copy_from_init(req, src_snapid, 0,
2278 src_oid, src_oloc,
2279 src_fadvise_flags,
2280 dst_fadvise_flags,
2281 truncate_seq,
2282 truncate_size,
2283 CEPH_OSD_COPY_FROM_FLAG_TRUNCATE_SEQ);
2284 if (ret)
2285 goto out;
2286
2287 ret = ceph_osdc_alloc_messages(req, GFP_KERNEL);
2288 if (ret)
2289 goto out;
2290
2291 return req;
2292
2293out:
2294 ceph_osdc_put_request(req);
2295 return ERR_PTR(ret);
2296}
2297
2298static ssize_t ceph_do_objects_copy(struct ceph_inode_info *src_ci, u64 *src_off,
2299 struct ceph_inode_info *dst_ci, u64 *dst_off,
2300 struct ceph_fs_client *fsc,
2301 size_t len, unsigned int flags)
2302{
2303 struct ceph_object_locator src_oloc, dst_oloc;
2304 struct ceph_object_id src_oid, dst_oid;
2305 struct ceph_osd_client *osdc;
2306 struct ceph_osd_request *req;
2307 size_t bytes = 0;
2308 u64 src_objnum, src_objoff, dst_objnum, dst_objoff;
2309 u32 src_objlen, dst_objlen;
2310 u32 object_size = src_ci->i_layout.object_size;
2311 int ret;
2312
2313 src_oloc.pool = src_ci->i_layout.pool_id;
2314 src_oloc.pool_ns = ceph_try_get_string(src_ci->i_layout.pool_ns);
2315 dst_oloc.pool = dst_ci->i_layout.pool_id;
2316 dst_oloc.pool_ns = ceph_try_get_string(dst_ci->i_layout.pool_ns);
2317 osdc = &fsc->client->osdc;
2318
2319 while (len >= object_size) {
2320 ceph_calc_file_object_mapping(&src_ci->i_layout, *src_off,
2321 object_size, &src_objnum,
2322 &src_objoff, &src_objlen);
2323 ceph_calc_file_object_mapping(&dst_ci->i_layout, *dst_off,
2324 object_size, &dst_objnum,
2325 &dst_objoff, &dst_objlen);
2326 ceph_oid_init(&src_oid);
2327 ceph_oid_printf(&src_oid, "%llx.%08llx",
2328 src_ci->i_vino.ino, src_objnum);
2329 ceph_oid_init(&dst_oid);
2330 ceph_oid_printf(&dst_oid, "%llx.%08llx",
2331 dst_ci->i_vino.ino, dst_objnum);
2332 /* Do an object remote copy */
2333 req = ceph_alloc_copyfrom_request(osdc, src_ci->i_vino.snap,
2334 &src_oid, &src_oloc,
2335 &dst_oid, &dst_oloc,
2336 dst_ci->i_truncate_seq,
2337 dst_ci->i_truncate_size);
2338 if (IS_ERR(req))
2339 ret = PTR_ERR(req);
2340 else {
2341 ceph_osdc_start_request(osdc, req);
2342 ret = ceph_osdc_wait_request(osdc, req);
2343 ceph_update_copyfrom_metrics(&fsc->mdsc->metric,
2344 req->r_start_latency,
2345 req->r_end_latency,
2346 object_size, ret);
2347 ceph_osdc_put_request(req);
2348 }
2349 if (ret) {
2350 if (ret == -EOPNOTSUPP) {
2351 fsc->have_copy_from2 = false;
2352 pr_notice("OSDs don't support copy-from2; disabling copy offload\n");
2353 }
2354 dout("ceph_osdc_copy_from returned %d\n", ret);
2355 if (!bytes)
2356 bytes = ret;
2357 goto out;
2358 }
2359 len -= object_size;
2360 bytes += object_size;
2361 *src_off += object_size;
2362 *dst_off += object_size;
2363 }
2364
2365out:
2366 ceph_oloc_destroy(&src_oloc);
2367 ceph_oloc_destroy(&dst_oloc);
2368 return bytes;
2369}
2370
2371static ssize_t __ceph_copy_file_range(struct file *src_file, loff_t src_off,
2372 struct file *dst_file, loff_t dst_off,
2373 size_t len, unsigned int flags)
2374{
2375 struct inode *src_inode = file_inode(src_file);
2376 struct inode *dst_inode = file_inode(dst_file);
2377 struct ceph_inode_info *src_ci = ceph_inode(src_inode);
2378 struct ceph_inode_info *dst_ci = ceph_inode(dst_inode);
2379 struct ceph_cap_flush *prealloc_cf;
2380 struct ceph_fs_client *src_fsc = ceph_inode_to_client(src_inode);
2381 loff_t size;
2382 ssize_t ret = -EIO, bytes;
2383 u64 src_objnum, dst_objnum, src_objoff, dst_objoff;
2384 u32 src_objlen, dst_objlen;
2385 int src_got = 0, dst_got = 0, err, dirty;
2386
2387 if (src_inode->i_sb != dst_inode->i_sb) {
2388 struct ceph_fs_client *dst_fsc = ceph_inode_to_client(dst_inode);
2389
2390 if (ceph_fsid_compare(&src_fsc->client->fsid,
2391 &dst_fsc->client->fsid)) {
2392 dout("Copying files across clusters: src: %pU dst: %pU\n",
2393 &src_fsc->client->fsid, &dst_fsc->client->fsid);
2394 return -EXDEV;
2395 }
2396 }
2397 if (ceph_snap(dst_inode) != CEPH_NOSNAP)
2398 return -EROFS;
2399
2400 /*
2401 * Some of the checks below will return -EOPNOTSUPP, which will force a
2402 * fallback to the default VFS copy_file_range implementation. This is
2403 * desirable in several cases (for ex, the 'len' is smaller than the
2404 * size of the objects, or in cases where that would be more
2405 * efficient).
2406 */
2407
2408 if (ceph_test_mount_opt(src_fsc, NOCOPYFROM))
2409 return -EOPNOTSUPP;
2410
2411 if (!src_fsc->have_copy_from2)
2412 return -EOPNOTSUPP;
2413
2414 /*
2415 * Striped file layouts require that we copy partial objects, but the
2416 * OSD copy-from operation only supports full-object copies. Limit
2417 * this to non-striped file layouts for now.
2418 */
2419 if ((src_ci->i_layout.stripe_unit != dst_ci->i_layout.stripe_unit) ||
2420 (src_ci->i_layout.stripe_count != 1) ||
2421 (dst_ci->i_layout.stripe_count != 1) ||
2422 (src_ci->i_layout.object_size != dst_ci->i_layout.object_size)) {
2423 dout("Invalid src/dst files layout\n");
2424 return -EOPNOTSUPP;
2425 }
2426
2427 if (len < src_ci->i_layout.object_size)
2428 return -EOPNOTSUPP; /* no remote copy will be done */
2429
2430 prealloc_cf = ceph_alloc_cap_flush();
2431 if (!prealloc_cf)
2432 return -ENOMEM;
2433
2434 /* Start by sync'ing the source and destination files */
2435 ret = file_write_and_wait_range(src_file, src_off, (src_off + len));
2436 if (ret < 0) {
2437 dout("failed to write src file (%zd)\n", ret);
2438 goto out;
2439 }
2440 ret = file_write_and_wait_range(dst_file, dst_off, (dst_off + len));
2441 if (ret < 0) {
2442 dout("failed to write dst file (%zd)\n", ret);
2443 goto out;
2444 }
2445
2446 /*
2447 * We need FILE_WR caps for dst_ci and FILE_RD for src_ci as other
2448 * clients may have dirty data in their caches. And OSDs know nothing
2449 * about caps, so they can't safely do the remote object copies.
2450 */
2451 err = get_rd_wr_caps(src_file, &src_got,
2452 dst_file, (dst_off + len), &dst_got);
2453 if (err < 0) {
2454 dout("get_rd_wr_caps returned %d\n", err);
2455 ret = -EOPNOTSUPP;
2456 goto out;
2457 }
2458
2459 ret = is_file_size_ok(src_inode, dst_inode, src_off, dst_off, len);
2460 if (ret < 0)
2461 goto out_caps;
2462
2463 /* Drop dst file cached pages */
2464 ceph_fscache_invalidate(dst_inode, false);
2465 ret = invalidate_inode_pages2_range(dst_inode->i_mapping,
2466 dst_off >> PAGE_SHIFT,
2467 (dst_off + len) >> PAGE_SHIFT);
2468 if (ret < 0) {
2469 dout("Failed to invalidate inode pages (%zd)\n", ret);
2470 ret = 0; /* XXX */
2471 }
2472 ceph_calc_file_object_mapping(&src_ci->i_layout, src_off,
2473 src_ci->i_layout.object_size,
2474 &src_objnum, &src_objoff, &src_objlen);
2475 ceph_calc_file_object_mapping(&dst_ci->i_layout, dst_off,
2476 dst_ci->i_layout.object_size,
2477 &dst_objnum, &dst_objoff, &dst_objlen);
2478 /* object-level offsets need to the same */
2479 if (src_objoff != dst_objoff) {
2480 ret = -EOPNOTSUPP;
2481 goto out_caps;
2482 }
2483
2484 /*
2485 * Do a manual copy if the object offset isn't object aligned.
2486 * 'src_objlen' contains the bytes left until the end of the object,
2487 * starting at the src_off
2488 */
2489 if (src_objoff) {
2490 dout("Initial partial copy of %u bytes\n", src_objlen);
2491
2492 /*
2493 * we need to temporarily drop all caps as we'll be calling
2494 * {read,write}_iter, which will get caps again.
2495 */
2496 put_rd_wr_caps(src_ci, src_got, dst_ci, dst_got);
2497 ret = do_splice_direct(src_file, &src_off, dst_file,
2498 &dst_off, src_objlen, flags);
2499 /* Abort on short copies or on error */
2500 if (ret < src_objlen) {
2501 dout("Failed partial copy (%zd)\n", ret);
2502 goto out;
2503 }
2504 len -= ret;
2505 err = get_rd_wr_caps(src_file, &src_got,
2506 dst_file, (dst_off + len), &dst_got);
2507 if (err < 0)
2508 goto out;
2509 err = is_file_size_ok(src_inode, dst_inode,
2510 src_off, dst_off, len);
2511 if (err < 0)
2512 goto out_caps;
2513 }
2514
2515 size = i_size_read(dst_inode);
2516 bytes = ceph_do_objects_copy(src_ci, &src_off, dst_ci, &dst_off,
2517 src_fsc, len, flags);
2518 if (bytes <= 0) {
2519 if (!ret)
2520 ret = bytes;
2521 goto out_caps;
2522 }
2523 dout("Copied %zu bytes out of %zu\n", bytes, len);
2524 len -= bytes;
2525 ret += bytes;
2526
2527 file_update_time(dst_file);
2528 inode_inc_iversion_raw(dst_inode);
2529
2530 if (dst_off > size) {
2531 /* Let the MDS know about dst file size change */
2532 if (ceph_inode_set_size(dst_inode, dst_off) ||
2533 ceph_quota_is_max_bytes_approaching(dst_inode, dst_off))
2534 ceph_check_caps(dst_ci, CHECK_CAPS_AUTHONLY | CHECK_CAPS_FLUSH);
2535 }
2536 /* Mark Fw dirty */
2537 spin_lock(&dst_ci->i_ceph_lock);
2538 dirty = __ceph_mark_dirty_caps(dst_ci, CEPH_CAP_FILE_WR, &prealloc_cf);
2539 spin_unlock(&dst_ci->i_ceph_lock);
2540 if (dirty)
2541 __mark_inode_dirty(dst_inode, dirty);
2542
2543out_caps:
2544 put_rd_wr_caps(src_ci, src_got, dst_ci, dst_got);
2545
2546 /*
2547 * Do the final manual copy if we still have some bytes left, unless
2548 * there were errors in remote object copies (len >= object_size).
2549 */
2550 if (len && (len < src_ci->i_layout.object_size)) {
2551 dout("Final partial copy of %zu bytes\n", len);
2552 bytes = do_splice_direct(src_file, &src_off, dst_file,
2553 &dst_off, len, flags);
2554 if (bytes > 0)
2555 ret += bytes;
2556 else
2557 dout("Failed partial copy (%zd)\n", bytes);
2558 }
2559
2560out:
2561 ceph_free_cap_flush(prealloc_cf);
2562
2563 return ret;
2564}
2565
2566static ssize_t ceph_copy_file_range(struct file *src_file, loff_t src_off,
2567 struct file *dst_file, loff_t dst_off,
2568 size_t len, unsigned int flags)
2569{
2570 ssize_t ret;
2571
2572 ret = __ceph_copy_file_range(src_file, src_off, dst_file, dst_off,
2573 len, flags);
2574
2575 if (ret == -EOPNOTSUPP || ret == -EXDEV)
2576 ret = generic_copy_file_range(src_file, src_off, dst_file,
2577 dst_off, len, flags);
2578 return ret;
2579}
2580
2581const struct file_operations ceph_file_fops = {
2582 .open = ceph_open,
2583 .release = ceph_release,
2584 .llseek = ceph_llseek,
2585 .read_iter = ceph_read_iter,
2586 .write_iter = ceph_write_iter,
2587 .mmap = ceph_mmap,
2588 .fsync = ceph_fsync,
2589 .lock = ceph_lock,
2590 .setlease = simple_nosetlease,
2591 .flock = ceph_flock,
2592 .splice_read = generic_file_splice_read,
2593 .splice_write = iter_file_splice_write,
2594 .unlocked_ioctl = ceph_ioctl,
2595 .compat_ioctl = compat_ptr_ioctl,
2596 .fallocate = ceph_fallocate,
2597 .copy_file_range = ceph_copy_file_range,
2598};