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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 struct ceph_inode_info *ci = ceph_inode(inode);
141 struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
142 struct ceph_mds_client *mdsc = fsc->mdsc;
143
144 switch (inode->i_mode & S_IFMT) {
145 case S_IFREG:
146 /* First file open request creates the cookie, we want to keep
147 * this cookie around for the filetime of the inode as not to
148 * have to worry about fscache register / revoke / operation
149 * races.
150 *
151 * Also, if we know the operation is going to invalidate data
152 * (non readonly) just nuke the cache right away.
153 */
154 ceph_fscache_register_inode_cookie(mdsc->fsc, ci);
155 if ((fmode & CEPH_FILE_MODE_WR))
156 ceph_fscache_invalidate(inode);
157 case S_IFDIR:
158 dout("init_file %p %p 0%o (regular)\n", inode, file,
159 inode->i_mode);
160 cf = kmem_cache_zalloc(ceph_file_cachep, GFP_KERNEL);
161 if (cf == NULL) {
162 ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */
163 return -ENOMEM;
164 }
165 cf->fmode = fmode;
166 cf->next_offset = 2;
167 cf->readdir_cache_idx = -1;
168 file->private_data = cf;
169 BUG_ON(inode->i_fop->release != ceph_release);
170 break;
171
172 case S_IFLNK:
173 dout("init_file %p %p 0%o (symlink)\n", inode, file,
174 inode->i_mode);
175 ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */
176 break;
177
178 default:
179 dout("init_file %p %p 0%o (special)\n", inode, file,
180 inode->i_mode);
181 /*
182 * we need to drop the open ref now, since we don't
183 * have .release set to ceph_release.
184 */
185 ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */
186 BUG_ON(inode->i_fop->release == ceph_release);
187
188 /* call the proper open fop */
189 ret = inode->i_fop->open(inode, file);
190 }
191 return ret;
192}
193
194/*
195 * If we already have the requisite capabilities, we can satisfy
196 * the open request locally (no need to request new caps from the
197 * MDS). We do, however, need to inform the MDS (asynchronously)
198 * if our wanted caps set expands.
199 */
200int ceph_open(struct inode *inode, struct file *file)
201{
202 struct ceph_inode_info *ci = ceph_inode(inode);
203 struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
204 struct ceph_mds_client *mdsc = fsc->mdsc;
205 struct ceph_mds_request *req;
206 struct ceph_file_info *cf = file->private_data;
207 int err;
208 int flags, fmode, wanted;
209
210 if (cf) {
211 dout("open file %p is already opened\n", file);
212 return 0;
213 }
214
215 /* filter out O_CREAT|O_EXCL; vfs did that already. yuck. */
216 flags = file->f_flags & ~(O_CREAT|O_EXCL);
217 if (S_ISDIR(inode->i_mode))
218 flags = O_DIRECTORY; /* mds likes to know */
219
220 dout("open inode %p ino %llx.%llx file %p flags %d (%d)\n", inode,
221 ceph_vinop(inode), file, flags, file->f_flags);
222 fmode = ceph_flags_to_mode(flags);
223 wanted = ceph_caps_for_mode(fmode);
224
225 /* snapped files are read-only */
226 if (ceph_snap(inode) != CEPH_NOSNAP && (file->f_mode & FMODE_WRITE))
227 return -EROFS;
228
229 /* trivially open snapdir */
230 if (ceph_snap(inode) == CEPH_SNAPDIR) {
231 spin_lock(&ci->i_ceph_lock);
232 __ceph_get_fmode(ci, fmode);
233 spin_unlock(&ci->i_ceph_lock);
234 return ceph_init_file(inode, file, fmode);
235 }
236
237 /*
238 * No need to block if we have caps on the auth MDS (for
239 * write) or any MDS (for read). Update wanted set
240 * asynchronously.
241 */
242 spin_lock(&ci->i_ceph_lock);
243 if (__ceph_is_any_real_caps(ci) &&
244 (((fmode & CEPH_FILE_MODE_WR) == 0) || ci->i_auth_cap)) {
245 int mds_wanted = __ceph_caps_mds_wanted(ci);
246 int issued = __ceph_caps_issued(ci, NULL);
247
248 dout("open %p fmode %d want %s issued %s using existing\n",
249 inode, fmode, ceph_cap_string(wanted),
250 ceph_cap_string(issued));
251 __ceph_get_fmode(ci, fmode);
252 spin_unlock(&ci->i_ceph_lock);
253
254 /* adjust wanted? */
255 if ((issued & wanted) != wanted &&
256 (mds_wanted & wanted) != wanted &&
257 ceph_snap(inode) != CEPH_SNAPDIR)
258 ceph_check_caps(ci, 0, NULL);
259
260 return ceph_init_file(inode, file, fmode);
261 } else if (ceph_snap(inode) != CEPH_NOSNAP &&
262 (ci->i_snap_caps & wanted) == wanted) {
263 __ceph_get_fmode(ci, fmode);
264 spin_unlock(&ci->i_ceph_lock);
265 return ceph_init_file(inode, file, fmode);
266 }
267
268 spin_unlock(&ci->i_ceph_lock);
269
270 dout("open fmode %d wants %s\n", fmode, ceph_cap_string(wanted));
271 req = prepare_open_request(inode->i_sb, flags, 0);
272 if (IS_ERR(req)) {
273 err = PTR_ERR(req);
274 goto out;
275 }
276 req->r_inode = inode;
277 ihold(inode);
278
279 req->r_num_caps = 1;
280 err = ceph_mdsc_do_request(mdsc, NULL, req);
281 if (!err)
282 err = ceph_init_file(inode, file, req->r_fmode);
283 ceph_mdsc_put_request(req);
284 dout("open result=%d on %llx.%llx\n", err, ceph_vinop(inode));
285out:
286 return err;
287}
288
289
290/*
291 * Do a lookup + open with a single request. If we get a non-existent
292 * file or symlink, return 1 so the VFS can retry.
293 */
294int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
295 struct file *file, unsigned flags, umode_t mode,
296 int *opened)
297{
298 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
299 struct ceph_mds_client *mdsc = fsc->mdsc;
300 struct ceph_mds_request *req;
301 struct dentry *dn;
302 struct ceph_acls_info acls = {};
303 int mask;
304 int err;
305
306 dout("atomic_open %p dentry %p '%pd' %s flags %d mode 0%o\n",
307 dir, dentry, dentry,
308 d_unhashed(dentry) ? "unhashed" : "hashed", flags, mode);
309
310 if (dentry->d_name.len > NAME_MAX)
311 return -ENAMETOOLONG;
312
313 err = ceph_init_dentry(dentry);
314 if (err < 0)
315 return err;
316
317 if (flags & O_CREAT) {
318 err = ceph_pre_init_acls(dir, &mode, &acls);
319 if (err < 0)
320 return err;
321 }
322
323 /* do the open */
324 req = prepare_open_request(dir->i_sb, flags, mode);
325 if (IS_ERR(req)) {
326 err = PTR_ERR(req);
327 goto out_acl;
328 }
329 req->r_dentry = dget(dentry);
330 req->r_num_caps = 2;
331 if (flags & O_CREAT) {
332 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
333 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
334 if (acls.pagelist) {
335 req->r_pagelist = acls.pagelist;
336 acls.pagelist = NULL;
337 }
338 }
339
340 mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED;
341 if (ceph_security_xattr_wanted(dir))
342 mask |= CEPH_CAP_XATTR_SHARED;
343 req->r_args.open.mask = cpu_to_le32(mask);
344
345 req->r_locked_dir = dir; /* caller holds dir->i_mutex */
346 err = ceph_mdsc_do_request(mdsc,
347 (flags & (O_CREAT|O_TRUNC)) ? dir : NULL,
348 req);
349 err = ceph_handle_snapdir(req, dentry, err);
350 if (err)
351 goto out_req;
352
353 if ((flags & O_CREAT) && !req->r_reply_info.head->is_dentry)
354 err = ceph_handle_notrace_create(dir, dentry);
355
356 if (d_unhashed(dentry)) {
357 dn = ceph_finish_lookup(req, dentry, err);
358 if (IS_ERR(dn))
359 err = PTR_ERR(dn);
360 } else {
361 /* we were given a hashed negative dentry */
362 dn = NULL;
363 }
364 if (err)
365 goto out_req;
366 if (dn || d_really_is_negative(dentry) || d_is_symlink(dentry)) {
367 /* make vfs retry on splice, ENOENT, or symlink */
368 dout("atomic_open finish_no_open on dn %p\n", dn);
369 err = finish_no_open(file, dn);
370 } else {
371 dout("atomic_open finish_open on dn %p\n", dn);
372 if (req->r_op == CEPH_MDS_OP_CREATE && req->r_reply_info.has_create_ino) {
373 ceph_init_inode_acls(d_inode(dentry), &acls);
374 *opened |= FILE_CREATED;
375 }
376 err = finish_open(file, dentry, ceph_open, opened);
377 }
378out_req:
379 if (!req->r_err && req->r_target_inode)
380 ceph_put_fmode(ceph_inode(req->r_target_inode), req->r_fmode);
381 ceph_mdsc_put_request(req);
382out_acl:
383 ceph_release_acls_info(&acls);
384 dout("atomic_open result=%d\n", err);
385 return err;
386}
387
388int ceph_release(struct inode *inode, struct file *file)
389{
390 struct ceph_inode_info *ci = ceph_inode(inode);
391 struct ceph_file_info *cf = file->private_data;
392
393 dout("release inode %p file %p\n", inode, file);
394 ceph_put_fmode(ci, cf->fmode);
395 if (cf->last_readdir)
396 ceph_mdsc_put_request(cf->last_readdir);
397 kfree(cf->last_name);
398 kfree(cf->dir_info);
399 kmem_cache_free(ceph_file_cachep, cf);
400
401 /* wake up anyone waiting for caps on this inode */
402 wake_up_all(&ci->i_cap_wq);
403 return 0;
404}
405
406enum {
407 HAVE_RETRIED = 1,
408 CHECK_EOF = 2,
409 READ_INLINE = 3,
410};
411
412/*
413 * Read a range of bytes striped over one or more objects. Iterate over
414 * objects we stripe over. (That's not atomic, but good enough for now.)
415 *
416 * If we get a short result from the OSD, check against i_size; we need to
417 * only return a short read to the caller if we hit EOF.
418 */
419static int striped_read(struct inode *inode,
420 u64 off, u64 len,
421 struct page **pages, int num_pages,
422 int *checkeof)
423{
424 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
425 struct ceph_inode_info *ci = ceph_inode(inode);
426 u64 pos, this_len, left;
427 loff_t i_size;
428 int page_align, pages_left;
429 int read, ret;
430 struct page **page_pos;
431 bool hit_stripe, was_short;
432
433 /*
434 * we may need to do multiple reads. not atomic, unfortunately.
435 */
436 pos = off;
437 left = len;
438 page_pos = pages;
439 pages_left = num_pages;
440 read = 0;
441
442more:
443 page_align = pos & ~PAGE_MASK;
444 this_len = left;
445 ret = ceph_osdc_readpages(&fsc->client->osdc, ceph_vino(inode),
446 &ci->i_layout, pos, &this_len,
447 ci->i_truncate_seq,
448 ci->i_truncate_size,
449 page_pos, pages_left, page_align);
450 if (ret == -ENOENT)
451 ret = 0;
452 hit_stripe = this_len < left;
453 was_short = ret >= 0 && ret < this_len;
454 dout("striped_read %llu~%llu (read %u) got %d%s%s\n", pos, left, read,
455 ret, hit_stripe ? " HITSTRIPE" : "", was_short ? " SHORT" : "");
456
457 i_size = i_size_read(inode);
458 if (ret >= 0) {
459 int didpages;
460 if (was_short && (pos + ret < i_size)) {
461 int zlen = min(this_len - ret, i_size - pos - ret);
462 int zoff = (off & ~PAGE_MASK) + read + ret;
463 dout(" zero gap %llu to %llu\n",
464 pos + ret, pos + ret + zlen);
465 ceph_zero_page_vector_range(zoff, zlen, pages);
466 ret += zlen;
467 }
468
469 didpages = (page_align + ret) >> PAGE_SHIFT;
470 pos += ret;
471 read = pos - off;
472 left -= ret;
473 page_pos += didpages;
474 pages_left -= didpages;
475
476 /* hit stripe and need continue*/
477 if (left && hit_stripe && pos < i_size)
478 goto more;
479 }
480
481 if (read > 0) {
482 ret = read;
483 /* did we bounce off eof? */
484 if (pos + left > i_size)
485 *checkeof = CHECK_EOF;
486 }
487
488 dout("striped_read returns %d\n", ret);
489 return ret;
490}
491
492/*
493 * Completely synchronous read and write methods. Direct from __user
494 * buffer to osd, or directly to user pages (if O_DIRECT).
495 *
496 * If the read spans object boundary, just do multiple reads.
497 */
498static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *i,
499 int *checkeof)
500{
501 struct file *file = iocb->ki_filp;
502 struct inode *inode = file_inode(file);
503 struct page **pages;
504 u64 off = iocb->ki_pos;
505 int num_pages, ret;
506 size_t len = iov_iter_count(i);
507
508 dout("sync_read on file %p %llu~%u %s\n", file, off,
509 (unsigned)len,
510 (file->f_flags & O_DIRECT) ? "O_DIRECT" : "");
511
512 if (!len)
513 return 0;
514 /*
515 * flush any page cache pages in this range. this
516 * will make concurrent normal and sync io slow,
517 * but it will at least behave sensibly when they are
518 * in sequence.
519 */
520 ret = filemap_write_and_wait_range(inode->i_mapping, off,
521 off + len);
522 if (ret < 0)
523 return ret;
524
525 num_pages = calc_pages_for(off, len);
526 pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL);
527 if (IS_ERR(pages))
528 return PTR_ERR(pages);
529 ret = striped_read(inode, off, len, pages,
530 num_pages, checkeof);
531 if (ret > 0) {
532 int l, k = 0;
533 size_t left = ret;
534
535 while (left) {
536 size_t page_off = off & ~PAGE_MASK;
537 size_t copy = min_t(size_t, left,
538 PAGE_SIZE - page_off);
539 l = copy_page_to_iter(pages[k++], page_off, copy, i);
540 off += l;
541 left -= l;
542 if (l < copy)
543 break;
544 }
545 }
546 ceph_release_page_vector(pages, num_pages);
547
548 if (off > iocb->ki_pos) {
549 ret = off - iocb->ki_pos;
550 iocb->ki_pos = off;
551 }
552
553 dout("sync_read result %d\n", ret);
554 return ret;
555}
556
557struct ceph_aio_request {
558 struct kiocb *iocb;
559 size_t total_len;
560 int write;
561 int error;
562 struct list_head osd_reqs;
563 unsigned num_reqs;
564 atomic_t pending_reqs;
565 struct timespec mtime;
566 struct ceph_cap_flush *prealloc_cf;
567};
568
569struct ceph_aio_work {
570 struct work_struct work;
571 struct ceph_osd_request *req;
572};
573
574static void ceph_aio_retry_work(struct work_struct *work);
575
576static void ceph_aio_complete(struct inode *inode,
577 struct ceph_aio_request *aio_req)
578{
579 struct ceph_inode_info *ci = ceph_inode(inode);
580 int ret;
581
582 if (!atomic_dec_and_test(&aio_req->pending_reqs))
583 return;
584
585 ret = aio_req->error;
586 if (!ret)
587 ret = aio_req->total_len;
588
589 dout("ceph_aio_complete %p rc %d\n", inode, ret);
590
591 if (ret >= 0 && aio_req->write) {
592 int dirty;
593
594 loff_t endoff = aio_req->iocb->ki_pos + aio_req->total_len;
595 if (endoff > i_size_read(inode)) {
596 if (ceph_inode_set_size(inode, endoff))
597 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
598 }
599
600 spin_lock(&ci->i_ceph_lock);
601 ci->i_inline_version = CEPH_INLINE_NONE;
602 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
603 &aio_req->prealloc_cf);
604 spin_unlock(&ci->i_ceph_lock);
605 if (dirty)
606 __mark_inode_dirty(inode, dirty);
607
608 }
609
610 ceph_put_cap_refs(ci, (aio_req->write ? CEPH_CAP_FILE_WR :
611 CEPH_CAP_FILE_RD));
612
613 aio_req->iocb->ki_complete(aio_req->iocb, ret, 0);
614
615 ceph_free_cap_flush(aio_req->prealloc_cf);
616 kfree(aio_req);
617}
618
619static void ceph_aio_complete_req(struct ceph_osd_request *req,
620 struct ceph_msg *msg)
621{
622 int rc = req->r_result;
623 struct inode *inode = req->r_inode;
624 struct ceph_aio_request *aio_req = req->r_priv;
625 struct ceph_osd_data *osd_data = osd_req_op_extent_osd_data(req, 0);
626 int num_pages = calc_pages_for((u64)osd_data->alignment,
627 osd_data->length);
628
629 dout("ceph_aio_complete_req %p rc %d bytes %llu\n",
630 inode, rc, osd_data->length);
631
632 if (rc == -EOLDSNAPC) {
633 struct ceph_aio_work *aio_work;
634 BUG_ON(!aio_req->write);
635
636 aio_work = kmalloc(sizeof(*aio_work), GFP_NOFS);
637 if (aio_work) {
638 INIT_WORK(&aio_work->work, ceph_aio_retry_work);
639 aio_work->req = req;
640 queue_work(ceph_inode_to_client(inode)->wb_wq,
641 &aio_work->work);
642 return;
643 }
644 rc = -ENOMEM;
645 } else if (!aio_req->write) {
646 if (rc == -ENOENT)
647 rc = 0;
648 if (rc >= 0 && osd_data->length > rc) {
649 int zoff = osd_data->alignment + rc;
650 int zlen = osd_data->length - rc;
651 /*
652 * If read is satisfied by single OSD request,
653 * it can pass EOF. Otherwise read is within
654 * i_size.
655 */
656 if (aio_req->num_reqs == 1) {
657 loff_t i_size = i_size_read(inode);
658 loff_t endoff = aio_req->iocb->ki_pos + rc;
659 if (endoff < i_size)
660 zlen = min_t(size_t, zlen,
661 i_size - endoff);
662 aio_req->total_len = rc + zlen;
663 }
664
665 if (zlen > 0)
666 ceph_zero_page_vector_range(zoff, zlen,
667 osd_data->pages);
668 }
669 }
670
671 ceph_put_page_vector(osd_data->pages, num_pages, false);
672 ceph_osdc_put_request(req);
673
674 if (rc < 0)
675 cmpxchg(&aio_req->error, 0, rc);
676
677 ceph_aio_complete(inode, aio_req);
678 return;
679}
680
681static void ceph_aio_retry_work(struct work_struct *work)
682{
683 struct ceph_aio_work *aio_work =
684 container_of(work, struct ceph_aio_work, work);
685 struct ceph_osd_request *orig_req = aio_work->req;
686 struct ceph_aio_request *aio_req = orig_req->r_priv;
687 struct inode *inode = orig_req->r_inode;
688 struct ceph_inode_info *ci = ceph_inode(inode);
689 struct ceph_snap_context *snapc;
690 struct ceph_osd_request *req;
691 int ret;
692
693 spin_lock(&ci->i_ceph_lock);
694 if (__ceph_have_pending_cap_snap(ci)) {
695 struct ceph_cap_snap *capsnap =
696 list_last_entry(&ci->i_cap_snaps,
697 struct ceph_cap_snap,
698 ci_item);
699 snapc = ceph_get_snap_context(capsnap->context);
700 } else {
701 BUG_ON(!ci->i_head_snapc);
702 snapc = ceph_get_snap_context(ci->i_head_snapc);
703 }
704 spin_unlock(&ci->i_ceph_lock);
705
706 req = ceph_osdc_alloc_request(orig_req->r_osdc, snapc, 2,
707 false, GFP_NOFS);
708 if (!req) {
709 ret = -ENOMEM;
710 req = orig_req;
711 goto out;
712 }
713
714 req->r_flags = CEPH_OSD_FLAG_ORDERSNAP |
715 CEPH_OSD_FLAG_ONDISK |
716 CEPH_OSD_FLAG_WRITE;
717 req->r_base_oloc = orig_req->r_base_oloc;
718 req->r_base_oid = orig_req->r_base_oid;
719
720 req->r_ops[0] = orig_req->r_ops[0];
721 osd_req_op_init(req, 1, CEPH_OSD_OP_STARTSYNC, 0);
722
723 ceph_osdc_build_request(req, req->r_ops[0].extent.offset,
724 snapc, CEPH_NOSNAP, &aio_req->mtime);
725
726 ceph_osdc_put_request(orig_req);
727
728 req->r_callback = ceph_aio_complete_req;
729 req->r_inode = inode;
730 req->r_priv = aio_req;
731
732 ret = ceph_osdc_start_request(req->r_osdc, req, false);
733out:
734 if (ret < 0) {
735 req->r_result = ret;
736 ceph_aio_complete_req(req, NULL);
737 }
738
739 ceph_put_snap_context(snapc);
740 kfree(aio_work);
741}
742
743/*
744 * Write commit request unsafe callback, called to tell us when a
745 * request is unsafe (that is, in flight--has been handed to the
746 * messenger to send to its target osd). It is called again when
747 * we've received a response message indicating the request is
748 * "safe" (its CEPH_OSD_FLAG_ONDISK flag is set), or when a request
749 * is completed early (and unsuccessfully) due to a timeout or
750 * interrupt.
751 *
752 * This is used if we requested both an ACK and ONDISK commit reply
753 * from the OSD.
754 */
755static void ceph_sync_write_unsafe(struct ceph_osd_request *req, bool unsafe)
756{
757 struct ceph_inode_info *ci = ceph_inode(req->r_inode);
758
759 dout("%s %p tid %llu %ssafe\n", __func__, req, req->r_tid,
760 unsafe ? "un" : "");
761 if (unsafe) {
762 ceph_get_cap_refs(ci, CEPH_CAP_FILE_WR);
763 spin_lock(&ci->i_unsafe_lock);
764 list_add_tail(&req->r_unsafe_item,
765 &ci->i_unsafe_writes);
766 spin_unlock(&ci->i_unsafe_lock);
767 } else {
768 spin_lock(&ci->i_unsafe_lock);
769 list_del_init(&req->r_unsafe_item);
770 spin_unlock(&ci->i_unsafe_lock);
771 ceph_put_cap_refs(ci, CEPH_CAP_FILE_WR);
772 }
773}
774
775
776static ssize_t
777ceph_direct_read_write(struct kiocb *iocb, struct iov_iter *iter,
778 struct ceph_snap_context *snapc,
779 struct ceph_cap_flush **pcf)
780{
781 struct file *file = iocb->ki_filp;
782 struct inode *inode = file_inode(file);
783 struct ceph_inode_info *ci = ceph_inode(inode);
784 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
785 struct ceph_vino vino;
786 struct ceph_osd_request *req;
787 struct page **pages;
788 struct ceph_aio_request *aio_req = NULL;
789 int num_pages = 0;
790 int flags;
791 int ret;
792 struct timespec mtime = current_fs_time(inode->i_sb);
793 size_t count = iov_iter_count(iter);
794 loff_t pos = iocb->ki_pos;
795 bool write = iov_iter_rw(iter) == WRITE;
796
797 if (write && ceph_snap(file_inode(file)) != CEPH_NOSNAP)
798 return -EROFS;
799
800 dout("sync_direct_read_write (%s) on file %p %lld~%u\n",
801 (write ? "write" : "read"), file, pos, (unsigned)count);
802
803 ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + count);
804 if (ret < 0)
805 return ret;
806
807 if (write) {
808 ret = invalidate_inode_pages2_range(inode->i_mapping,
809 pos >> PAGE_SHIFT,
810 (pos + count) >> PAGE_SHIFT);
811 if (ret < 0)
812 dout("invalidate_inode_pages2_range returned %d\n", ret);
813
814 flags = CEPH_OSD_FLAG_ORDERSNAP |
815 CEPH_OSD_FLAG_ONDISK |
816 CEPH_OSD_FLAG_WRITE;
817 } else {
818 flags = CEPH_OSD_FLAG_READ;
819 }
820
821 while (iov_iter_count(iter) > 0) {
822 u64 size = dio_get_pagev_size(iter);
823 size_t start = 0;
824 ssize_t len;
825
826 vino = ceph_vino(inode);
827 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
828 vino, pos, &size, 0,
829 /*include a 'startsync' command*/
830 write ? 2 : 1,
831 write ? CEPH_OSD_OP_WRITE :
832 CEPH_OSD_OP_READ,
833 flags, snapc,
834 ci->i_truncate_seq,
835 ci->i_truncate_size,
836 false);
837 if (IS_ERR(req)) {
838 ret = PTR_ERR(req);
839 break;
840 }
841
842 len = size;
843 pages = dio_get_pages_alloc(iter, len, &start, &num_pages);
844 if (IS_ERR(pages)) {
845 ceph_osdc_put_request(req);
846 ret = PTR_ERR(pages);
847 break;
848 }
849
850 /*
851 * To simplify error handling, allow AIO when IO within i_size
852 * or IO can be satisfied by single OSD request.
853 */
854 if (pos == iocb->ki_pos && !is_sync_kiocb(iocb) &&
855 (len == count || pos + count <= i_size_read(inode))) {
856 aio_req = kzalloc(sizeof(*aio_req), GFP_KERNEL);
857 if (aio_req) {
858 aio_req->iocb = iocb;
859 aio_req->write = write;
860 INIT_LIST_HEAD(&aio_req->osd_reqs);
861 if (write) {
862 aio_req->mtime = mtime;
863 swap(aio_req->prealloc_cf, *pcf);
864 }
865 }
866 /* ignore error */
867 }
868
869 if (write) {
870 /*
871 * throw out any page cache pages in this range. this
872 * may block.
873 */
874 truncate_inode_pages_range(inode->i_mapping, pos,
875 (pos+len) | (PAGE_SIZE - 1));
876
877 osd_req_op_init(req, 1, CEPH_OSD_OP_STARTSYNC, 0);
878 }
879
880
881 osd_req_op_extent_osd_data_pages(req, 0, pages, len, start,
882 false, false);
883
884 ceph_osdc_build_request(req, pos, snapc, vino.snap, &mtime);
885
886 if (aio_req) {
887 aio_req->total_len += len;
888 aio_req->num_reqs++;
889 atomic_inc(&aio_req->pending_reqs);
890
891 req->r_callback = ceph_aio_complete_req;
892 req->r_inode = inode;
893 req->r_priv = aio_req;
894 list_add_tail(&req->r_unsafe_item, &aio_req->osd_reqs);
895
896 pos += len;
897 iov_iter_advance(iter, len);
898 continue;
899 }
900
901 ret = ceph_osdc_start_request(req->r_osdc, req, false);
902 if (!ret)
903 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
904
905 size = i_size_read(inode);
906 if (!write) {
907 if (ret == -ENOENT)
908 ret = 0;
909 if (ret >= 0 && ret < len && pos + ret < size) {
910 int zlen = min_t(size_t, len - ret,
911 size - pos - ret);
912 ceph_zero_page_vector_range(start + ret, zlen,
913 pages);
914 ret += zlen;
915 }
916 if (ret >= 0)
917 len = ret;
918 }
919
920 ceph_put_page_vector(pages, num_pages, false);
921
922 ceph_osdc_put_request(req);
923 if (ret < 0)
924 break;
925
926 pos += len;
927 iov_iter_advance(iter, len);
928
929 if (!write && pos >= size)
930 break;
931
932 if (write && pos > size) {
933 if (ceph_inode_set_size(inode, pos))
934 ceph_check_caps(ceph_inode(inode),
935 CHECK_CAPS_AUTHONLY,
936 NULL);
937 }
938 }
939
940 if (aio_req) {
941 if (aio_req->num_reqs == 0) {
942 kfree(aio_req);
943 return ret;
944 }
945
946 ceph_get_cap_refs(ci, write ? CEPH_CAP_FILE_WR :
947 CEPH_CAP_FILE_RD);
948
949 while (!list_empty(&aio_req->osd_reqs)) {
950 req = list_first_entry(&aio_req->osd_reqs,
951 struct ceph_osd_request,
952 r_unsafe_item);
953 list_del_init(&req->r_unsafe_item);
954 if (ret >= 0)
955 ret = ceph_osdc_start_request(req->r_osdc,
956 req, false);
957 if (ret < 0) {
958 req->r_result = ret;
959 ceph_aio_complete_req(req, NULL);
960 }
961 }
962 return -EIOCBQUEUED;
963 }
964
965 if (ret != -EOLDSNAPC && pos > iocb->ki_pos) {
966 ret = pos - iocb->ki_pos;
967 iocb->ki_pos = pos;
968 }
969 return ret;
970}
971
972/*
973 * Synchronous write, straight from __user pointer or user pages.
974 *
975 * If write spans object boundary, just do multiple writes. (For a
976 * correct atomic write, we should e.g. take write locks on all
977 * objects, rollback on failure, etc.)
978 */
979static ssize_t
980ceph_sync_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos,
981 struct ceph_snap_context *snapc)
982{
983 struct file *file = iocb->ki_filp;
984 struct inode *inode = file_inode(file);
985 struct ceph_inode_info *ci = ceph_inode(inode);
986 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
987 struct ceph_vino vino;
988 struct ceph_osd_request *req;
989 struct page **pages;
990 u64 len;
991 int num_pages;
992 int written = 0;
993 int flags;
994 int check_caps = 0;
995 int ret;
996 struct timespec mtime = current_fs_time(inode->i_sb);
997 size_t count = iov_iter_count(from);
998
999 if (ceph_snap(file_inode(file)) != CEPH_NOSNAP)
1000 return -EROFS;
1001
1002 dout("sync_write on file %p %lld~%u\n", file, pos, (unsigned)count);
1003
1004 ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + count);
1005 if (ret < 0)
1006 return ret;
1007
1008 ret = invalidate_inode_pages2_range(inode->i_mapping,
1009 pos >> PAGE_SHIFT,
1010 (pos + count) >> PAGE_SHIFT);
1011 if (ret < 0)
1012 dout("invalidate_inode_pages2_range returned %d\n", ret);
1013
1014 flags = CEPH_OSD_FLAG_ORDERSNAP |
1015 CEPH_OSD_FLAG_ONDISK |
1016 CEPH_OSD_FLAG_WRITE |
1017 CEPH_OSD_FLAG_ACK;
1018
1019 while ((len = iov_iter_count(from)) > 0) {
1020 size_t left;
1021 int n;
1022
1023 vino = ceph_vino(inode);
1024 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1025 vino, pos, &len, 0, 1,
1026 CEPH_OSD_OP_WRITE, flags, snapc,
1027 ci->i_truncate_seq,
1028 ci->i_truncate_size,
1029 false);
1030 if (IS_ERR(req)) {
1031 ret = PTR_ERR(req);
1032 break;
1033 }
1034
1035 /*
1036 * write from beginning of first page,
1037 * regardless of io alignment
1038 */
1039 num_pages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
1040
1041 pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL);
1042 if (IS_ERR(pages)) {
1043 ret = PTR_ERR(pages);
1044 goto out;
1045 }
1046
1047 left = len;
1048 for (n = 0; n < num_pages; n++) {
1049 size_t plen = min_t(size_t, left, PAGE_SIZE);
1050 ret = copy_page_from_iter(pages[n], 0, plen, from);
1051 if (ret != plen) {
1052 ret = -EFAULT;
1053 break;
1054 }
1055 left -= ret;
1056 }
1057
1058 if (ret < 0) {
1059 ceph_release_page_vector(pages, num_pages);
1060 goto out;
1061 }
1062
1063 /* get a second commit callback */
1064 req->r_unsafe_callback = ceph_sync_write_unsafe;
1065 req->r_inode = inode;
1066
1067 osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0,
1068 false, true);
1069
1070 /* BUG_ON(vino.snap != CEPH_NOSNAP); */
1071 ceph_osdc_build_request(req, pos, snapc, vino.snap, &mtime);
1072
1073 ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
1074 if (!ret)
1075 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
1076
1077out:
1078 ceph_osdc_put_request(req);
1079 if (ret == 0) {
1080 pos += len;
1081 written += len;
1082
1083 if (pos > i_size_read(inode)) {
1084 check_caps = ceph_inode_set_size(inode, pos);
1085 if (check_caps)
1086 ceph_check_caps(ceph_inode(inode),
1087 CHECK_CAPS_AUTHONLY,
1088 NULL);
1089 }
1090 } else
1091 break;
1092 }
1093
1094 if (ret != -EOLDSNAPC && written > 0) {
1095 ret = written;
1096 iocb->ki_pos = pos;
1097 }
1098 return ret;
1099}
1100
1101/*
1102 * Wrap generic_file_aio_read with checks for cap bits on the inode.
1103 * Atomically grab references, so that those bits are not released
1104 * back to the MDS mid-read.
1105 *
1106 * Hmm, the sync read case isn't actually async... should it be?
1107 */
1108static ssize_t ceph_read_iter(struct kiocb *iocb, struct iov_iter *to)
1109{
1110 struct file *filp = iocb->ki_filp;
1111 struct ceph_file_info *fi = filp->private_data;
1112 size_t len = iov_iter_count(to);
1113 struct inode *inode = file_inode(filp);
1114 struct ceph_inode_info *ci = ceph_inode(inode);
1115 struct page *pinned_page = NULL;
1116 ssize_t ret;
1117 int want, got = 0;
1118 int retry_op = 0, read = 0;
1119
1120again:
1121 dout("aio_read %p %llx.%llx %llu~%u trying to get caps on %p\n",
1122 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len, inode);
1123
1124 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1125 want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
1126 else
1127 want = CEPH_CAP_FILE_CACHE;
1128 ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, -1, &got, &pinned_page);
1129 if (ret < 0)
1130 return ret;
1131
1132 if ((got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0 ||
1133 (iocb->ki_flags & IOCB_DIRECT) ||
1134 (fi->flags & CEPH_F_SYNC)) {
1135
1136 dout("aio_sync_read %p %llx.%llx %llu~%u got cap refs on %s\n",
1137 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
1138 ceph_cap_string(got));
1139
1140 if (ci->i_inline_version == CEPH_INLINE_NONE) {
1141 if (!retry_op && (iocb->ki_flags & IOCB_DIRECT)) {
1142 ret = ceph_direct_read_write(iocb, to,
1143 NULL, NULL);
1144 if (ret >= 0 && ret < len)
1145 retry_op = CHECK_EOF;
1146 } else {
1147 ret = ceph_sync_read(iocb, to, &retry_op);
1148 }
1149 } else {
1150 retry_op = READ_INLINE;
1151 }
1152 } else {
1153 dout("aio_read %p %llx.%llx %llu~%u got cap refs on %s\n",
1154 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
1155 ceph_cap_string(got));
1156
1157 ret = generic_file_read_iter(iocb, to);
1158 }
1159 dout("aio_read %p %llx.%llx dropping cap refs on %s = %d\n",
1160 inode, ceph_vinop(inode), ceph_cap_string(got), (int)ret);
1161 if (pinned_page) {
1162 put_page(pinned_page);
1163 pinned_page = NULL;
1164 }
1165 ceph_put_cap_refs(ci, got);
1166 if (retry_op > HAVE_RETRIED && ret >= 0) {
1167 int statret;
1168 struct page *page = NULL;
1169 loff_t i_size;
1170 if (retry_op == READ_INLINE) {
1171 page = __page_cache_alloc(GFP_KERNEL);
1172 if (!page)
1173 return -ENOMEM;
1174 }
1175
1176 statret = __ceph_do_getattr(inode, page,
1177 CEPH_STAT_CAP_INLINE_DATA, !!page);
1178 if (statret < 0) {
1179 __free_page(page);
1180 if (statret == -ENODATA) {
1181 BUG_ON(retry_op != READ_INLINE);
1182 goto again;
1183 }
1184 return statret;
1185 }
1186
1187 i_size = i_size_read(inode);
1188 if (retry_op == READ_INLINE) {
1189 BUG_ON(ret > 0 || read > 0);
1190 if (iocb->ki_pos < i_size &&
1191 iocb->ki_pos < PAGE_SIZE) {
1192 loff_t end = min_t(loff_t, i_size,
1193 iocb->ki_pos + len);
1194 end = min_t(loff_t, end, PAGE_SIZE);
1195 if (statret < end)
1196 zero_user_segment(page, statret, end);
1197 ret = copy_page_to_iter(page,
1198 iocb->ki_pos & ~PAGE_MASK,
1199 end - iocb->ki_pos, to);
1200 iocb->ki_pos += ret;
1201 read += ret;
1202 }
1203 if (iocb->ki_pos < i_size && read < len) {
1204 size_t zlen = min_t(size_t, len - read,
1205 i_size - iocb->ki_pos);
1206 ret = iov_iter_zero(zlen, to);
1207 iocb->ki_pos += ret;
1208 read += ret;
1209 }
1210 __free_pages(page, 0);
1211 return read;
1212 }
1213
1214 /* hit EOF or hole? */
1215 if (retry_op == CHECK_EOF && iocb->ki_pos < i_size &&
1216 ret < len) {
1217 dout("sync_read hit hole, ppos %lld < size %lld"
1218 ", reading more\n", iocb->ki_pos, i_size);
1219
1220 read += ret;
1221 len -= ret;
1222 retry_op = HAVE_RETRIED;
1223 goto again;
1224 }
1225 }
1226
1227 if (ret >= 0)
1228 ret += read;
1229
1230 return ret;
1231}
1232
1233/*
1234 * Take cap references to avoid releasing caps to MDS mid-write.
1235 *
1236 * If we are synchronous, and write with an old snap context, the OSD
1237 * may return EOLDSNAPC. In that case, retry the write.. _after_
1238 * dropping our cap refs and allowing the pending snap to logically
1239 * complete _before_ this write occurs.
1240 *
1241 * If we are near ENOSPC, write synchronously.
1242 */
1243static ssize_t ceph_write_iter(struct kiocb *iocb, struct iov_iter *from)
1244{
1245 struct file *file = iocb->ki_filp;
1246 struct ceph_file_info *fi = file->private_data;
1247 struct inode *inode = file_inode(file);
1248 struct ceph_inode_info *ci = ceph_inode(inode);
1249 struct ceph_osd_client *osdc =
1250 &ceph_sb_to_client(inode->i_sb)->client->osdc;
1251 struct ceph_cap_flush *prealloc_cf;
1252 ssize_t count, written = 0;
1253 int err, want, got;
1254 loff_t pos;
1255
1256 if (ceph_snap(inode) != CEPH_NOSNAP)
1257 return -EROFS;
1258
1259 prealloc_cf = ceph_alloc_cap_flush();
1260 if (!prealloc_cf)
1261 return -ENOMEM;
1262
1263 inode_lock(inode);
1264
1265 /* We can write back this queue in page reclaim */
1266 current->backing_dev_info = inode_to_bdi(inode);
1267
1268 if (iocb->ki_flags & IOCB_APPEND) {
1269 err = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false);
1270 if (err < 0)
1271 goto out;
1272 }
1273
1274 err = generic_write_checks(iocb, from);
1275 if (err <= 0)
1276 goto out;
1277
1278 pos = iocb->ki_pos;
1279 count = iov_iter_count(from);
1280 err = file_remove_privs(file);
1281 if (err)
1282 goto out;
1283
1284 err = file_update_time(file);
1285 if (err)
1286 goto out;
1287
1288 if (ci->i_inline_version != CEPH_INLINE_NONE) {
1289 err = ceph_uninline_data(file, NULL);
1290 if (err < 0)
1291 goto out;
1292 }
1293
1294retry_snap:
1295 if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL)) {
1296 err = -ENOSPC;
1297 goto out;
1298 }
1299
1300 dout("aio_write %p %llx.%llx %llu~%zd getting caps. i_size %llu\n",
1301 inode, ceph_vinop(inode), pos, count, i_size_read(inode));
1302 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1303 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
1304 else
1305 want = CEPH_CAP_FILE_BUFFER;
1306 got = 0;
1307 err = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, pos + count,
1308 &got, NULL);
1309 if (err < 0)
1310 goto out;
1311
1312 dout("aio_write %p %llx.%llx %llu~%zd got cap refs on %s\n",
1313 inode, ceph_vinop(inode), pos, count, ceph_cap_string(got));
1314
1315 if ((got & (CEPH_CAP_FILE_BUFFER|CEPH_CAP_FILE_LAZYIO)) == 0 ||
1316 (iocb->ki_flags & IOCB_DIRECT) || (fi->flags & CEPH_F_SYNC)) {
1317 struct ceph_snap_context *snapc;
1318 struct iov_iter data;
1319 inode_unlock(inode);
1320
1321 spin_lock(&ci->i_ceph_lock);
1322 if (__ceph_have_pending_cap_snap(ci)) {
1323 struct ceph_cap_snap *capsnap =
1324 list_last_entry(&ci->i_cap_snaps,
1325 struct ceph_cap_snap,
1326 ci_item);
1327 snapc = ceph_get_snap_context(capsnap->context);
1328 } else {
1329 BUG_ON(!ci->i_head_snapc);
1330 snapc = ceph_get_snap_context(ci->i_head_snapc);
1331 }
1332 spin_unlock(&ci->i_ceph_lock);
1333
1334 /* we might need to revert back to that point */
1335 data = *from;
1336 if (iocb->ki_flags & IOCB_DIRECT)
1337 written = ceph_direct_read_write(iocb, &data, snapc,
1338 &prealloc_cf);
1339 else
1340 written = ceph_sync_write(iocb, &data, pos, snapc);
1341 if (written == -EOLDSNAPC) {
1342 dout("aio_write %p %llx.%llx %llu~%u"
1343 "got EOLDSNAPC, retrying\n",
1344 inode, ceph_vinop(inode),
1345 pos, (unsigned)count);
1346 inode_lock(inode);
1347 goto retry_snap;
1348 }
1349 if (written > 0)
1350 iov_iter_advance(from, written);
1351 ceph_put_snap_context(snapc);
1352 } else {
1353 loff_t old_size = i_size_read(inode);
1354 /*
1355 * No need to acquire the i_truncate_mutex. Because
1356 * the MDS revokes Fwb caps before sending truncate
1357 * message to us. We can't get Fwb cap while there
1358 * are pending vmtruncate. So write and vmtruncate
1359 * can not run at the same time
1360 */
1361 written = generic_perform_write(file, from, pos);
1362 if (likely(written >= 0))
1363 iocb->ki_pos = pos + written;
1364 if (i_size_read(inode) > old_size)
1365 ceph_fscache_update_objectsize(inode);
1366 inode_unlock(inode);
1367 }
1368
1369 if (written >= 0) {
1370 int dirty;
1371 spin_lock(&ci->i_ceph_lock);
1372 ci->i_inline_version = CEPH_INLINE_NONE;
1373 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
1374 &prealloc_cf);
1375 spin_unlock(&ci->i_ceph_lock);
1376 if (dirty)
1377 __mark_inode_dirty(inode, dirty);
1378 }
1379
1380 dout("aio_write %p %llx.%llx %llu~%u dropping cap refs on %s\n",
1381 inode, ceph_vinop(inode), pos, (unsigned)count,
1382 ceph_cap_string(got));
1383 ceph_put_cap_refs(ci, got);
1384
1385 if (written >= 0 &&
1386 ((file->f_flags & O_SYNC) || IS_SYNC(file->f_mapping->host) ||
1387 ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_NEARFULL))) {
1388 err = vfs_fsync_range(file, pos, pos + written - 1, 1);
1389 if (err < 0)
1390 written = err;
1391 }
1392
1393 goto out_unlocked;
1394
1395out:
1396 inode_unlock(inode);
1397out_unlocked:
1398 ceph_free_cap_flush(prealloc_cf);
1399 current->backing_dev_info = NULL;
1400 return written ? written : err;
1401}
1402
1403/*
1404 * llseek. be sure to verify file size on SEEK_END.
1405 */
1406static loff_t ceph_llseek(struct file *file, loff_t offset, int whence)
1407{
1408 struct inode *inode = file->f_mapping->host;
1409 loff_t i_size;
1410 int ret;
1411
1412 inode_lock(inode);
1413
1414 if (whence == SEEK_END || whence == SEEK_DATA || whence == SEEK_HOLE) {
1415 ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false);
1416 if (ret < 0) {
1417 offset = ret;
1418 goto out;
1419 }
1420 }
1421
1422 i_size = i_size_read(inode);
1423 switch (whence) {
1424 case SEEK_END:
1425 offset += i_size;
1426 break;
1427 case SEEK_CUR:
1428 /*
1429 * Here we special-case the lseek(fd, 0, SEEK_CUR)
1430 * position-querying operation. Avoid rewriting the "same"
1431 * f_pos value back to the file because a concurrent read(),
1432 * write() or lseek() might have altered it
1433 */
1434 if (offset == 0) {
1435 offset = file->f_pos;
1436 goto out;
1437 }
1438 offset += file->f_pos;
1439 break;
1440 case SEEK_DATA:
1441 if (offset >= i_size) {
1442 ret = -ENXIO;
1443 goto out;
1444 }
1445 break;
1446 case SEEK_HOLE:
1447 if (offset >= i_size) {
1448 ret = -ENXIO;
1449 goto out;
1450 }
1451 offset = i_size;
1452 break;
1453 }
1454
1455 offset = vfs_setpos(file, offset, inode->i_sb->s_maxbytes);
1456
1457out:
1458 inode_unlock(inode);
1459 return offset;
1460}
1461
1462static inline void ceph_zero_partial_page(
1463 struct inode *inode, loff_t offset, unsigned size)
1464{
1465 struct page *page;
1466 pgoff_t index = offset >> PAGE_SHIFT;
1467
1468 page = find_lock_page(inode->i_mapping, index);
1469 if (page) {
1470 wait_on_page_writeback(page);
1471 zero_user(page, offset & (PAGE_SIZE - 1), size);
1472 unlock_page(page);
1473 put_page(page);
1474 }
1475}
1476
1477static void ceph_zero_pagecache_range(struct inode *inode, loff_t offset,
1478 loff_t length)
1479{
1480 loff_t nearly = round_up(offset, PAGE_SIZE);
1481 if (offset < nearly) {
1482 loff_t size = nearly - offset;
1483 if (length < size)
1484 size = length;
1485 ceph_zero_partial_page(inode, offset, size);
1486 offset += size;
1487 length -= size;
1488 }
1489 if (length >= PAGE_SIZE) {
1490 loff_t size = round_down(length, PAGE_SIZE);
1491 truncate_pagecache_range(inode, offset, offset + size - 1);
1492 offset += size;
1493 length -= size;
1494 }
1495 if (length)
1496 ceph_zero_partial_page(inode, offset, length);
1497}
1498
1499static int ceph_zero_partial_object(struct inode *inode,
1500 loff_t offset, loff_t *length)
1501{
1502 struct ceph_inode_info *ci = ceph_inode(inode);
1503 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1504 struct ceph_osd_request *req;
1505 int ret = 0;
1506 loff_t zero = 0;
1507 int op;
1508
1509 if (!length) {
1510 op = offset ? CEPH_OSD_OP_DELETE : CEPH_OSD_OP_TRUNCATE;
1511 length = &zero;
1512 } else {
1513 op = CEPH_OSD_OP_ZERO;
1514 }
1515
1516 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1517 ceph_vino(inode),
1518 offset, length,
1519 0, 1, op,
1520 CEPH_OSD_FLAG_WRITE |
1521 CEPH_OSD_FLAG_ONDISK,
1522 NULL, 0, 0, false);
1523 if (IS_ERR(req)) {
1524 ret = PTR_ERR(req);
1525 goto out;
1526 }
1527
1528 ceph_osdc_build_request(req, offset, NULL, ceph_vino(inode).snap,
1529 &inode->i_mtime);
1530
1531 ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
1532 if (!ret) {
1533 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
1534 if (ret == -ENOENT)
1535 ret = 0;
1536 }
1537 ceph_osdc_put_request(req);
1538
1539out:
1540 return ret;
1541}
1542
1543static int ceph_zero_objects(struct inode *inode, loff_t offset, loff_t length)
1544{
1545 int ret = 0;
1546 struct ceph_inode_info *ci = ceph_inode(inode);
1547 s32 stripe_unit = ceph_file_layout_su(ci->i_layout);
1548 s32 stripe_count = ceph_file_layout_stripe_count(ci->i_layout);
1549 s32 object_size = ceph_file_layout_object_size(ci->i_layout);
1550 u64 object_set_size = object_size * stripe_count;
1551 u64 nearly, t;
1552
1553 /* round offset up to next period boundary */
1554 nearly = offset + object_set_size - 1;
1555 t = nearly;
1556 nearly -= do_div(t, object_set_size);
1557
1558 while (length && offset < nearly) {
1559 loff_t size = length;
1560 ret = ceph_zero_partial_object(inode, offset, &size);
1561 if (ret < 0)
1562 return ret;
1563 offset += size;
1564 length -= size;
1565 }
1566 while (length >= object_set_size) {
1567 int i;
1568 loff_t pos = offset;
1569 for (i = 0; i < stripe_count; ++i) {
1570 ret = ceph_zero_partial_object(inode, pos, NULL);
1571 if (ret < 0)
1572 return ret;
1573 pos += stripe_unit;
1574 }
1575 offset += object_set_size;
1576 length -= object_set_size;
1577 }
1578 while (length) {
1579 loff_t size = length;
1580 ret = ceph_zero_partial_object(inode, offset, &size);
1581 if (ret < 0)
1582 return ret;
1583 offset += size;
1584 length -= size;
1585 }
1586 return ret;
1587}
1588
1589static long ceph_fallocate(struct file *file, int mode,
1590 loff_t offset, loff_t length)
1591{
1592 struct ceph_file_info *fi = file->private_data;
1593 struct inode *inode = file_inode(file);
1594 struct ceph_inode_info *ci = ceph_inode(inode);
1595 struct ceph_osd_client *osdc =
1596 &ceph_inode_to_client(inode)->client->osdc;
1597 struct ceph_cap_flush *prealloc_cf;
1598 int want, got = 0;
1599 int dirty;
1600 int ret = 0;
1601 loff_t endoff = 0;
1602 loff_t size;
1603
1604 if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
1605 return -EOPNOTSUPP;
1606
1607 if (!S_ISREG(inode->i_mode))
1608 return -EOPNOTSUPP;
1609
1610 prealloc_cf = ceph_alloc_cap_flush();
1611 if (!prealloc_cf)
1612 return -ENOMEM;
1613
1614 inode_lock(inode);
1615
1616 if (ceph_snap(inode) != CEPH_NOSNAP) {
1617 ret = -EROFS;
1618 goto unlock;
1619 }
1620
1621 if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL) &&
1622 !(mode & FALLOC_FL_PUNCH_HOLE)) {
1623 ret = -ENOSPC;
1624 goto unlock;
1625 }
1626
1627 if (ci->i_inline_version != CEPH_INLINE_NONE) {
1628 ret = ceph_uninline_data(file, NULL);
1629 if (ret < 0)
1630 goto unlock;
1631 }
1632
1633 size = i_size_read(inode);
1634 if (!(mode & FALLOC_FL_KEEP_SIZE))
1635 endoff = offset + length;
1636
1637 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1638 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
1639 else
1640 want = CEPH_CAP_FILE_BUFFER;
1641
1642 ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, endoff, &got, NULL);
1643 if (ret < 0)
1644 goto unlock;
1645
1646 if (mode & FALLOC_FL_PUNCH_HOLE) {
1647 if (offset < size)
1648 ceph_zero_pagecache_range(inode, offset, length);
1649 ret = ceph_zero_objects(inode, offset, length);
1650 } else if (endoff > size) {
1651 truncate_pagecache_range(inode, size, -1);
1652 if (ceph_inode_set_size(inode, endoff))
1653 ceph_check_caps(ceph_inode(inode),
1654 CHECK_CAPS_AUTHONLY, NULL);
1655 }
1656
1657 if (!ret) {
1658 spin_lock(&ci->i_ceph_lock);
1659 ci->i_inline_version = CEPH_INLINE_NONE;
1660 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
1661 &prealloc_cf);
1662 spin_unlock(&ci->i_ceph_lock);
1663 if (dirty)
1664 __mark_inode_dirty(inode, dirty);
1665 }
1666
1667 ceph_put_cap_refs(ci, got);
1668unlock:
1669 inode_unlock(inode);
1670 ceph_free_cap_flush(prealloc_cf);
1671 return ret;
1672}
1673
1674const struct file_operations ceph_file_fops = {
1675 .open = ceph_open,
1676 .release = ceph_release,
1677 .llseek = ceph_llseek,
1678 .read_iter = ceph_read_iter,
1679 .write_iter = ceph_write_iter,
1680 .mmap = ceph_mmap,
1681 .fsync = ceph_fsync,
1682 .lock = ceph_lock,
1683 .flock = ceph_flock,
1684 .splice_read = generic_file_splice_read,
1685 .splice_write = iter_file_splice_write,
1686 .unlocked_ioctl = ceph_ioctl,
1687 .compat_ioctl = ceph_ioctl,
1688 .fallocate = ceph_fallocate,
1689};
1690
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#include <linux/splice.h>
16
17#include "super.h"
18#include "mds_client.h"
19#include "cache.h"
20#include "io.h"
21#include "metric.h"
22
23static __le32 ceph_flags_sys2wire(struct ceph_mds_client *mdsc, u32 flags)
24{
25 struct ceph_client *cl = mdsc->fsc->client;
26 u32 wire_flags = 0;
27
28 switch (flags & O_ACCMODE) {
29 case O_RDONLY:
30 wire_flags |= CEPH_O_RDONLY;
31 break;
32 case O_WRONLY:
33 wire_flags |= CEPH_O_WRONLY;
34 break;
35 case O_RDWR:
36 wire_flags |= CEPH_O_RDWR;
37 break;
38 }
39
40 flags &= ~O_ACCMODE;
41
42#define ceph_sys2wire(a) if (flags & a) { wire_flags |= CEPH_##a; flags &= ~a; }
43
44 ceph_sys2wire(O_CREAT);
45 ceph_sys2wire(O_EXCL);
46 ceph_sys2wire(O_TRUNC);
47 ceph_sys2wire(O_DIRECTORY);
48 ceph_sys2wire(O_NOFOLLOW);
49
50#undef ceph_sys2wire
51
52 if (flags)
53 doutc(cl, "unused open flags: %x\n", flags);
54
55 return cpu_to_le32(wire_flags);
56}
57
58/*
59 * Ceph file operations
60 *
61 * Implement basic open/close functionality, and implement
62 * read/write.
63 *
64 * We implement three modes of file I/O:
65 * - buffered uses the generic_file_aio_{read,write} helpers
66 *
67 * - synchronous is used when there is multi-client read/write
68 * sharing, avoids the page cache, and synchronously waits for an
69 * ack from the OSD.
70 *
71 * - direct io takes the variant of the sync path that references
72 * user pages directly.
73 *
74 * fsync() flushes and waits on dirty pages, but just queues metadata
75 * for writeback: since the MDS can recover size and mtime there is no
76 * need to wait for MDS acknowledgement.
77 */
78
79/*
80 * How many pages to get in one call to iov_iter_get_pages(). This
81 * determines the size of the on-stack array used as a buffer.
82 */
83#define ITER_GET_BVECS_PAGES 64
84
85static ssize_t __iter_get_bvecs(struct iov_iter *iter, size_t maxsize,
86 struct bio_vec *bvecs)
87{
88 size_t size = 0;
89 int bvec_idx = 0;
90
91 if (maxsize > iov_iter_count(iter))
92 maxsize = iov_iter_count(iter);
93
94 while (size < maxsize) {
95 struct page *pages[ITER_GET_BVECS_PAGES];
96 ssize_t bytes;
97 size_t start;
98 int idx = 0;
99
100 bytes = iov_iter_get_pages2(iter, pages, maxsize - size,
101 ITER_GET_BVECS_PAGES, &start);
102 if (bytes < 0)
103 return size ?: bytes;
104
105 size += bytes;
106
107 for ( ; bytes; idx++, bvec_idx++) {
108 int len = min_t(int, bytes, PAGE_SIZE - start);
109
110 bvec_set_page(&bvecs[bvec_idx], pages[idx], len, start);
111 bytes -= len;
112 start = 0;
113 }
114 }
115
116 return size;
117}
118
119/*
120 * iov_iter_get_pages() only considers one iov_iter segment, no matter
121 * what maxsize or maxpages are given. For ITER_BVEC that is a single
122 * page.
123 *
124 * Attempt to get up to @maxsize bytes worth of pages from @iter.
125 * Return the number of bytes in the created bio_vec array, or an error.
126 */
127static ssize_t iter_get_bvecs_alloc(struct iov_iter *iter, size_t maxsize,
128 struct bio_vec **bvecs, int *num_bvecs)
129{
130 struct bio_vec *bv;
131 size_t orig_count = iov_iter_count(iter);
132 ssize_t bytes;
133 int npages;
134
135 iov_iter_truncate(iter, maxsize);
136 npages = iov_iter_npages(iter, INT_MAX);
137 iov_iter_reexpand(iter, orig_count);
138
139 /*
140 * __iter_get_bvecs() may populate only part of the array -- zero it
141 * out.
142 */
143 bv = kvmalloc_array(npages, sizeof(*bv), GFP_KERNEL | __GFP_ZERO);
144 if (!bv)
145 return -ENOMEM;
146
147 bytes = __iter_get_bvecs(iter, maxsize, bv);
148 if (bytes < 0) {
149 /*
150 * No pages were pinned -- just free the array.
151 */
152 kvfree(bv);
153 return bytes;
154 }
155
156 *bvecs = bv;
157 *num_bvecs = npages;
158 return bytes;
159}
160
161static void put_bvecs(struct bio_vec *bvecs, int num_bvecs, bool should_dirty)
162{
163 int i;
164
165 for (i = 0; i < num_bvecs; i++) {
166 if (bvecs[i].bv_page) {
167 if (should_dirty)
168 set_page_dirty_lock(bvecs[i].bv_page);
169 put_page(bvecs[i].bv_page);
170 }
171 }
172 kvfree(bvecs);
173}
174
175/*
176 * Prepare an open request. Preallocate ceph_cap to avoid an
177 * inopportune ENOMEM later.
178 */
179static struct ceph_mds_request *
180prepare_open_request(struct super_block *sb, int flags, int create_mode)
181{
182 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(sb);
183 struct ceph_mds_request *req;
184 int want_auth = USE_ANY_MDS;
185 int op = (flags & O_CREAT) ? CEPH_MDS_OP_CREATE : CEPH_MDS_OP_OPEN;
186
187 if (flags & (O_WRONLY|O_RDWR|O_CREAT|O_TRUNC))
188 want_auth = USE_AUTH_MDS;
189
190 req = ceph_mdsc_create_request(mdsc, op, want_auth);
191 if (IS_ERR(req))
192 goto out;
193 req->r_fmode = ceph_flags_to_mode(flags);
194 req->r_args.open.flags = ceph_flags_sys2wire(mdsc, flags);
195 req->r_args.open.mode = cpu_to_le32(create_mode);
196out:
197 return req;
198}
199
200static int ceph_init_file_info(struct inode *inode, struct file *file,
201 int fmode, bool isdir)
202{
203 struct ceph_inode_info *ci = ceph_inode(inode);
204 struct ceph_mount_options *opt =
205 ceph_inode_to_fs_client(&ci->netfs.inode)->mount_options;
206 struct ceph_client *cl = ceph_inode_to_client(inode);
207 struct ceph_file_info *fi;
208 int ret;
209
210 doutc(cl, "%p %llx.%llx %p 0%o (%s)\n", inode, ceph_vinop(inode),
211 file, inode->i_mode, isdir ? "dir" : "regular");
212 BUG_ON(inode->i_fop->release != ceph_release);
213
214 if (isdir) {
215 struct ceph_dir_file_info *dfi =
216 kmem_cache_zalloc(ceph_dir_file_cachep, GFP_KERNEL);
217 if (!dfi)
218 return -ENOMEM;
219
220 file->private_data = dfi;
221 fi = &dfi->file_info;
222 dfi->next_offset = 2;
223 dfi->readdir_cache_idx = -1;
224 } else {
225 fi = kmem_cache_zalloc(ceph_file_cachep, GFP_KERNEL);
226 if (!fi)
227 return -ENOMEM;
228
229 if (opt->flags & CEPH_MOUNT_OPT_NOPAGECACHE)
230 fi->flags |= CEPH_F_SYNC;
231
232 file->private_data = fi;
233 }
234
235 ceph_get_fmode(ci, fmode, 1);
236 fi->fmode = fmode;
237
238 spin_lock_init(&fi->rw_contexts_lock);
239 INIT_LIST_HEAD(&fi->rw_contexts);
240 fi->filp_gen = READ_ONCE(ceph_inode_to_fs_client(inode)->filp_gen);
241
242 if ((file->f_mode & FMODE_WRITE) && ceph_has_inline_data(ci)) {
243 ret = ceph_uninline_data(file);
244 if (ret < 0)
245 goto error;
246 }
247
248 return 0;
249
250error:
251 ceph_fscache_unuse_cookie(inode, file->f_mode & FMODE_WRITE);
252 ceph_put_fmode(ci, fi->fmode, 1);
253 kmem_cache_free(ceph_file_cachep, fi);
254 /* wake up anyone waiting for caps on this inode */
255 wake_up_all(&ci->i_cap_wq);
256 return ret;
257}
258
259/*
260 * initialize private struct file data.
261 * if we fail, clean up by dropping fmode reference on the ceph_inode
262 */
263static int ceph_init_file(struct inode *inode, struct file *file, int fmode)
264{
265 struct ceph_client *cl = ceph_inode_to_client(inode);
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 doutc(cl, "%p %llx.%llx %p 0%o (symlink)\n", inode,
279 ceph_vinop(inode), file, inode->i_mode);
280 break;
281
282 default:
283 doutc(cl, "%p %llx.%llx %p 0%o (special)\n", inode,
284 ceph_vinop(inode), file, 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_client *cl = mdsc->fsc->client;
304 struct ceph_inode_info *ci = ceph_inode(inode);
305 struct ceph_mds_request *req;
306 int err, flags, wanted;
307
308 spin_lock(&ci->i_ceph_lock);
309 __ceph_touch_fmode(ci, mdsc, fmode);
310 wanted = __ceph_caps_file_wanted(ci);
311 if (__ceph_is_any_real_caps(ci) &&
312 (!(wanted & CEPH_CAP_ANY_WR) || ci->i_auth_cap)) {
313 int issued = __ceph_caps_issued(ci, NULL);
314 spin_unlock(&ci->i_ceph_lock);
315 doutc(cl, "%p %llx.%llx want %s issued %s updating mds_wanted\n",
316 inode, ceph_vinop(inode), ceph_cap_string(wanted),
317 ceph_cap_string(issued));
318 ceph_check_caps(ci, 0);
319 return 0;
320 }
321 spin_unlock(&ci->i_ceph_lock);
322
323 flags = 0;
324 if ((wanted & CEPH_CAP_FILE_RD) && (wanted & CEPH_CAP_FILE_WR))
325 flags = O_RDWR;
326 else if (wanted & CEPH_CAP_FILE_RD)
327 flags = O_RDONLY;
328 else if (wanted & CEPH_CAP_FILE_WR)
329 flags = O_WRONLY;
330#ifdef O_LAZY
331 if (wanted & CEPH_CAP_FILE_LAZYIO)
332 flags |= O_LAZY;
333#endif
334
335 req = prepare_open_request(inode->i_sb, flags, 0);
336 if (IS_ERR(req)) {
337 err = PTR_ERR(req);
338 goto out;
339 }
340
341 req->r_inode = inode;
342 ihold(inode);
343 req->r_num_caps = 1;
344
345 err = ceph_mdsc_do_request(mdsc, NULL, req);
346 ceph_mdsc_put_request(req);
347out:
348 doutc(cl, "%p %llx.%llx open result=%d\n", inode, ceph_vinop(inode),
349 err);
350 return err < 0 ? err : 0;
351}
352
353/*
354 * If we already have the requisite capabilities, we can satisfy
355 * the open request locally (no need to request new caps from the
356 * MDS). We do, however, need to inform the MDS (asynchronously)
357 * if our wanted caps set expands.
358 */
359int ceph_open(struct inode *inode, struct file *file)
360{
361 struct ceph_inode_info *ci = ceph_inode(inode);
362 struct ceph_fs_client *fsc = ceph_sb_to_fs_client(inode->i_sb);
363 struct ceph_client *cl = fsc->client;
364 struct ceph_mds_client *mdsc = fsc->mdsc;
365 struct ceph_mds_request *req;
366 struct ceph_file_info *fi = file->private_data;
367 int err;
368 int flags, fmode, wanted;
369 struct dentry *dentry;
370 char *path;
371 int pathlen;
372 u64 pathbase;
373 bool do_sync = false;
374 int mask = MAY_READ;
375
376 if (fi) {
377 doutc(cl, "file %p is already opened\n", file);
378 return 0;
379 }
380
381 /* filter out O_CREAT|O_EXCL; vfs did that already. yuck. */
382 flags = file->f_flags & ~(O_CREAT|O_EXCL);
383 if (S_ISDIR(inode->i_mode)) {
384 flags = O_DIRECTORY; /* mds likes to know */
385 } else if (S_ISREG(inode->i_mode)) {
386 err = fscrypt_file_open(inode, file);
387 if (err)
388 return err;
389 }
390
391 doutc(cl, "%p %llx.%llx file %p flags %d (%d)\n", inode,
392 ceph_vinop(inode), file, flags, file->f_flags);
393 fmode = ceph_flags_to_mode(flags);
394 wanted = ceph_caps_for_mode(fmode);
395
396 if (fmode & CEPH_FILE_MODE_WR)
397 mask |= MAY_WRITE;
398 dentry = d_find_alias(inode);
399 if (!dentry) {
400 do_sync = true;
401 } else {
402 path = ceph_mdsc_build_path(mdsc, dentry, &pathlen, &pathbase, 0);
403 if (IS_ERR(path)) {
404 do_sync = true;
405 err = 0;
406 } else {
407 err = ceph_mds_check_access(mdsc, path, mask);
408 }
409 ceph_mdsc_free_path(path, pathlen);
410 dput(dentry);
411
412 /* For none EACCES cases will let the MDS do the mds auth check */
413 if (err == -EACCES) {
414 return err;
415 } else if (err < 0) {
416 do_sync = true;
417 err = 0;
418 }
419 }
420
421 /* snapped files are read-only */
422 if (ceph_snap(inode) != CEPH_NOSNAP && (file->f_mode & FMODE_WRITE))
423 return -EROFS;
424
425 /* trivially open snapdir */
426 if (ceph_snap(inode) == CEPH_SNAPDIR) {
427 return ceph_init_file(inode, file, fmode);
428 }
429
430 /*
431 * No need to block if we have caps on the auth MDS (for
432 * write) or any MDS (for read). Update wanted set
433 * asynchronously.
434 */
435 spin_lock(&ci->i_ceph_lock);
436 if (!do_sync && __ceph_is_any_real_caps(ci) &&
437 (((fmode & CEPH_FILE_MODE_WR) == 0) || ci->i_auth_cap)) {
438 int mds_wanted = __ceph_caps_mds_wanted(ci, true);
439 int issued = __ceph_caps_issued(ci, NULL);
440
441 doutc(cl, "open %p fmode %d want %s issued %s using existing\n",
442 inode, fmode, ceph_cap_string(wanted),
443 ceph_cap_string(issued));
444 __ceph_touch_fmode(ci, mdsc, fmode);
445 spin_unlock(&ci->i_ceph_lock);
446
447 /* adjust wanted? */
448 if ((issued & wanted) != wanted &&
449 (mds_wanted & wanted) != wanted &&
450 ceph_snap(inode) != CEPH_SNAPDIR)
451 ceph_check_caps(ci, 0);
452
453 return ceph_init_file(inode, file, fmode);
454 } else if (!do_sync && ceph_snap(inode) != CEPH_NOSNAP &&
455 (ci->i_snap_caps & wanted) == wanted) {
456 __ceph_touch_fmode(ci, mdsc, fmode);
457 spin_unlock(&ci->i_ceph_lock);
458 return ceph_init_file(inode, file, fmode);
459 }
460
461 spin_unlock(&ci->i_ceph_lock);
462
463 doutc(cl, "open fmode %d wants %s\n", fmode, ceph_cap_string(wanted));
464 req = prepare_open_request(inode->i_sb, flags, 0);
465 if (IS_ERR(req)) {
466 err = PTR_ERR(req);
467 goto out;
468 }
469 req->r_inode = inode;
470 ihold(inode);
471
472 req->r_num_caps = 1;
473 err = ceph_mdsc_do_request(mdsc, NULL, req);
474 if (!err)
475 err = ceph_init_file(inode, file, req->r_fmode);
476 ceph_mdsc_put_request(req);
477 doutc(cl, "open result=%d on %llx.%llx\n", err, ceph_vinop(inode));
478out:
479 return err;
480}
481
482/* Clone the layout from a synchronous create, if the dir now has Dc caps */
483static void
484cache_file_layout(struct inode *dst, struct inode *src)
485{
486 struct ceph_inode_info *cdst = ceph_inode(dst);
487 struct ceph_inode_info *csrc = ceph_inode(src);
488
489 spin_lock(&cdst->i_ceph_lock);
490 if ((__ceph_caps_issued(cdst, NULL) & CEPH_CAP_DIR_CREATE) &&
491 !ceph_file_layout_is_valid(&cdst->i_cached_layout)) {
492 memcpy(&cdst->i_cached_layout, &csrc->i_layout,
493 sizeof(cdst->i_cached_layout));
494 rcu_assign_pointer(cdst->i_cached_layout.pool_ns,
495 ceph_try_get_string(csrc->i_layout.pool_ns));
496 }
497 spin_unlock(&cdst->i_ceph_lock);
498}
499
500/*
501 * Try to set up an async create. We need caps, a file layout, and inode number,
502 * and either a lease on the dentry or complete dir info. If any of those
503 * criteria are not satisfied, then return false and the caller can go
504 * synchronous.
505 */
506static int try_prep_async_create(struct inode *dir, struct dentry *dentry,
507 struct ceph_file_layout *lo, u64 *pino)
508{
509 struct ceph_inode_info *ci = ceph_inode(dir);
510 struct ceph_dentry_info *di = ceph_dentry(dentry);
511 int got = 0, want = CEPH_CAP_FILE_EXCL | CEPH_CAP_DIR_CREATE;
512 u64 ino;
513
514 spin_lock(&ci->i_ceph_lock);
515 /* No auth cap means no chance for Dc caps */
516 if (!ci->i_auth_cap)
517 goto no_async;
518
519 /* Any delegated inos? */
520 if (xa_empty(&ci->i_auth_cap->session->s_delegated_inos))
521 goto no_async;
522
523 if (!ceph_file_layout_is_valid(&ci->i_cached_layout))
524 goto no_async;
525
526 if ((__ceph_caps_issued(ci, NULL) & want) != want)
527 goto no_async;
528
529 if (d_in_lookup(dentry)) {
530 if (!__ceph_dir_is_complete(ci))
531 goto no_async;
532 spin_lock(&dentry->d_lock);
533 di->lease_shared_gen = atomic_read(&ci->i_shared_gen);
534 spin_unlock(&dentry->d_lock);
535 } else if (atomic_read(&ci->i_shared_gen) !=
536 READ_ONCE(di->lease_shared_gen)) {
537 goto no_async;
538 }
539
540 ino = ceph_get_deleg_ino(ci->i_auth_cap->session);
541 if (!ino)
542 goto no_async;
543
544 *pino = ino;
545 ceph_take_cap_refs(ci, want, false);
546 memcpy(lo, &ci->i_cached_layout, sizeof(*lo));
547 rcu_assign_pointer(lo->pool_ns,
548 ceph_try_get_string(ci->i_cached_layout.pool_ns));
549 got = want;
550no_async:
551 spin_unlock(&ci->i_ceph_lock);
552 return got;
553}
554
555static void restore_deleg_ino(struct inode *dir, u64 ino)
556{
557 struct ceph_client *cl = ceph_inode_to_client(dir);
558 struct ceph_inode_info *ci = ceph_inode(dir);
559 struct ceph_mds_session *s = NULL;
560
561 spin_lock(&ci->i_ceph_lock);
562 if (ci->i_auth_cap)
563 s = ceph_get_mds_session(ci->i_auth_cap->session);
564 spin_unlock(&ci->i_ceph_lock);
565 if (s) {
566 int err = ceph_restore_deleg_ino(s, ino);
567 if (err)
568 pr_warn_client(cl,
569 "unable to restore delegated ino 0x%llx to session: %d\n",
570 ino, err);
571 ceph_put_mds_session(s);
572 }
573}
574
575static void wake_async_create_waiters(struct inode *inode,
576 struct ceph_mds_session *session)
577{
578 struct ceph_inode_info *ci = ceph_inode(inode);
579 bool check_cap = false;
580
581 spin_lock(&ci->i_ceph_lock);
582 if (ci->i_ceph_flags & CEPH_I_ASYNC_CREATE) {
583 ci->i_ceph_flags &= ~CEPH_I_ASYNC_CREATE;
584 wake_up_bit(&ci->i_ceph_flags, CEPH_ASYNC_CREATE_BIT);
585
586 if (ci->i_ceph_flags & CEPH_I_ASYNC_CHECK_CAPS) {
587 ci->i_ceph_flags &= ~CEPH_I_ASYNC_CHECK_CAPS;
588 check_cap = true;
589 }
590 }
591 ceph_kick_flushing_inode_caps(session, ci);
592 spin_unlock(&ci->i_ceph_lock);
593
594 if (check_cap)
595 ceph_check_caps(ci, CHECK_CAPS_FLUSH);
596}
597
598static void ceph_async_create_cb(struct ceph_mds_client *mdsc,
599 struct ceph_mds_request *req)
600{
601 struct ceph_client *cl = mdsc->fsc->client;
602 struct dentry *dentry = req->r_dentry;
603 struct inode *dinode = d_inode(dentry);
604 struct inode *tinode = req->r_target_inode;
605 int result = req->r_err ? req->r_err :
606 le32_to_cpu(req->r_reply_info.head->result);
607
608 WARN_ON_ONCE(dinode && tinode && dinode != tinode);
609
610 /* MDS changed -- caller must resubmit */
611 if (result == -EJUKEBOX)
612 goto out;
613
614 mapping_set_error(req->r_parent->i_mapping, result);
615
616 if (result) {
617 int pathlen = 0;
618 u64 base = 0;
619 char *path = ceph_mdsc_build_path(mdsc, req->r_dentry, &pathlen,
620 &base, 0);
621
622 pr_warn_client(cl,
623 "async create failure path=(%llx)%s result=%d!\n",
624 base, IS_ERR(path) ? "<<bad>>" : path, result);
625 ceph_mdsc_free_path(path, pathlen);
626
627 ceph_dir_clear_complete(req->r_parent);
628 if (!d_unhashed(dentry))
629 d_drop(dentry);
630
631 if (dinode) {
632 mapping_set_error(dinode->i_mapping, result);
633 ceph_inode_shutdown(dinode);
634 wake_async_create_waiters(dinode, req->r_session);
635 }
636 }
637
638 if (tinode) {
639 u64 ino = ceph_vino(tinode).ino;
640
641 if (req->r_deleg_ino != ino)
642 pr_warn_client(cl,
643 "inode number mismatch! err=%d deleg_ino=0x%llx target=0x%llx\n",
644 req->r_err, req->r_deleg_ino, ino);
645
646 mapping_set_error(tinode->i_mapping, result);
647 wake_async_create_waiters(tinode, req->r_session);
648 } else if (!result) {
649 pr_warn_client(cl, "no req->r_target_inode for 0x%llx\n",
650 req->r_deleg_ino);
651 }
652out:
653 ceph_mdsc_release_dir_caps(req);
654}
655
656static int ceph_finish_async_create(struct inode *dir, struct inode *inode,
657 struct dentry *dentry,
658 struct file *file, umode_t mode,
659 struct ceph_mds_request *req,
660 struct ceph_acl_sec_ctx *as_ctx,
661 struct ceph_file_layout *lo)
662{
663 int ret;
664 char xattr_buf[4];
665 struct ceph_mds_reply_inode in = { };
666 struct ceph_mds_reply_info_in iinfo = { .in = &in };
667 struct ceph_inode_info *ci = ceph_inode(dir);
668 struct ceph_dentry_info *di = ceph_dentry(dentry);
669 struct timespec64 now;
670 struct ceph_string *pool_ns;
671 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb);
672 struct ceph_client *cl = mdsc->fsc->client;
673 struct ceph_vino vino = { .ino = req->r_deleg_ino,
674 .snap = CEPH_NOSNAP };
675
676 ktime_get_real_ts64(&now);
677
678 iinfo.inline_version = CEPH_INLINE_NONE;
679 iinfo.change_attr = 1;
680 ceph_encode_timespec64(&iinfo.btime, &now);
681
682 if (req->r_pagelist) {
683 iinfo.xattr_len = req->r_pagelist->length;
684 iinfo.xattr_data = req->r_pagelist->mapped_tail;
685 } else {
686 /* fake it */
687 iinfo.xattr_len = ARRAY_SIZE(xattr_buf);
688 iinfo.xattr_data = xattr_buf;
689 memset(iinfo.xattr_data, 0, iinfo.xattr_len);
690 }
691
692 in.ino = cpu_to_le64(vino.ino);
693 in.snapid = cpu_to_le64(CEPH_NOSNAP);
694 in.version = cpu_to_le64(1); // ???
695 in.cap.caps = in.cap.wanted = cpu_to_le32(CEPH_CAP_ALL_FILE);
696 in.cap.cap_id = cpu_to_le64(1);
697 in.cap.realm = cpu_to_le64(ci->i_snap_realm->ino);
698 in.cap.flags = CEPH_CAP_FLAG_AUTH;
699 in.ctime = in.mtime = in.atime = iinfo.btime;
700 in.truncate_seq = cpu_to_le32(1);
701 in.truncate_size = cpu_to_le64(-1ULL);
702 in.xattr_version = cpu_to_le64(1);
703 in.uid = cpu_to_le32(from_kuid(&init_user_ns,
704 mapped_fsuid(req->r_mnt_idmap,
705 &init_user_ns)));
706 if (dir->i_mode & S_ISGID) {
707 in.gid = cpu_to_le32(from_kgid(&init_user_ns, dir->i_gid));
708
709 /* Directories always inherit the setgid bit. */
710 if (S_ISDIR(mode))
711 mode |= S_ISGID;
712 } else {
713 in.gid = cpu_to_le32(from_kgid(&init_user_ns,
714 mapped_fsgid(req->r_mnt_idmap,
715 &init_user_ns)));
716 }
717 in.mode = cpu_to_le32((u32)mode);
718
719 in.nlink = cpu_to_le32(1);
720 in.max_size = cpu_to_le64(lo->stripe_unit);
721
722 ceph_file_layout_to_legacy(lo, &in.layout);
723 /* lo is private, so pool_ns can't change */
724 pool_ns = rcu_dereference_raw(lo->pool_ns);
725 if (pool_ns) {
726 iinfo.pool_ns_len = pool_ns->len;
727 iinfo.pool_ns_data = pool_ns->str;
728 }
729
730 down_read(&mdsc->snap_rwsem);
731 ret = ceph_fill_inode(inode, NULL, &iinfo, NULL, req->r_session,
732 req->r_fmode, NULL);
733 up_read(&mdsc->snap_rwsem);
734 if (ret) {
735 doutc(cl, "failed to fill inode: %d\n", ret);
736 ceph_dir_clear_complete(dir);
737 if (!d_unhashed(dentry))
738 d_drop(dentry);
739 discard_new_inode(inode);
740 } else {
741 struct dentry *dn;
742
743 doutc(cl, "d_adding new inode 0x%llx to 0x%llx/%s\n",
744 vino.ino, ceph_ino(dir), dentry->d_name.name);
745 ceph_dir_clear_ordered(dir);
746 ceph_init_inode_acls(inode, as_ctx);
747 if (inode->i_state & I_NEW) {
748 /*
749 * If it's not I_NEW, then someone created this before
750 * we got here. Assume the server is aware of it at
751 * that point and don't worry about setting
752 * CEPH_I_ASYNC_CREATE.
753 */
754 ceph_inode(inode)->i_ceph_flags = CEPH_I_ASYNC_CREATE;
755 unlock_new_inode(inode);
756 }
757 if (d_in_lookup(dentry) || d_really_is_negative(dentry)) {
758 if (!d_unhashed(dentry))
759 d_drop(dentry);
760 dn = d_splice_alias(inode, dentry);
761 WARN_ON_ONCE(dn && dn != dentry);
762 }
763 file->f_mode |= FMODE_CREATED;
764 ret = finish_open(file, dentry, ceph_open);
765 }
766
767 spin_lock(&dentry->d_lock);
768 di->flags &= ~CEPH_DENTRY_ASYNC_CREATE;
769 wake_up_bit(&di->flags, CEPH_DENTRY_ASYNC_CREATE_BIT);
770 spin_unlock(&dentry->d_lock);
771
772 return ret;
773}
774
775/*
776 * Do a lookup + open with a single request. If we get a non-existent
777 * file or symlink, return 1 so the VFS can retry.
778 */
779int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
780 struct file *file, unsigned flags, umode_t mode)
781{
782 struct mnt_idmap *idmap = file_mnt_idmap(file);
783 struct ceph_fs_client *fsc = ceph_sb_to_fs_client(dir->i_sb);
784 struct ceph_client *cl = fsc->client;
785 struct ceph_mds_client *mdsc = fsc->mdsc;
786 struct ceph_mds_request *req;
787 struct inode *new_inode = NULL;
788 struct dentry *dn;
789 struct ceph_acl_sec_ctx as_ctx = {};
790 bool try_async = ceph_test_mount_opt(fsc, ASYNC_DIROPS);
791 int mask;
792 int err;
793 char *path;
794 int pathlen;
795 u64 pathbase;
796
797 doutc(cl, "%p %llx.%llx dentry %p '%pd' %s flags %d mode 0%o\n",
798 dir, ceph_vinop(dir), dentry, dentry,
799 d_unhashed(dentry) ? "unhashed" : "hashed", flags, mode);
800
801 if (dentry->d_name.len > NAME_MAX)
802 return -ENAMETOOLONG;
803
804 err = ceph_wait_on_conflict_unlink(dentry);
805 if (err)
806 return err;
807 /*
808 * Do not truncate the file, since atomic_open is called before the
809 * permission check. The caller will do the truncation afterward.
810 */
811 flags &= ~O_TRUNC;
812
813 dn = d_find_alias(dir);
814 if (!dn) {
815 try_async = false;
816 } else {
817 path = ceph_mdsc_build_path(mdsc, dn, &pathlen, &pathbase, 0);
818 if (IS_ERR(path)) {
819 try_async = false;
820 err = 0;
821 } else {
822 int fmode = ceph_flags_to_mode(flags);
823
824 mask = MAY_READ;
825 if (fmode & CEPH_FILE_MODE_WR)
826 mask |= MAY_WRITE;
827 err = ceph_mds_check_access(mdsc, path, mask);
828 }
829 ceph_mdsc_free_path(path, pathlen);
830 dput(dn);
831
832 /* For none EACCES cases will let the MDS do the mds auth check */
833 if (err == -EACCES) {
834 return err;
835 } else if (err < 0) {
836 try_async = false;
837 err = 0;
838 }
839 }
840
841retry:
842 if (flags & O_CREAT) {
843 if (ceph_quota_is_max_files_exceeded(dir))
844 return -EDQUOT;
845
846 new_inode = ceph_new_inode(dir, dentry, &mode, &as_ctx);
847 if (IS_ERR(new_inode)) {
848 err = PTR_ERR(new_inode);
849 goto out_ctx;
850 }
851 /* Async create can't handle more than a page of xattrs */
852 if (as_ctx.pagelist &&
853 !list_is_singular(&as_ctx.pagelist->head))
854 try_async = false;
855 } else if (!d_in_lookup(dentry)) {
856 /* If it's not being looked up, it's negative */
857 return -ENOENT;
858 }
859
860 /* do the open */
861 req = prepare_open_request(dir->i_sb, flags, mode);
862 if (IS_ERR(req)) {
863 err = PTR_ERR(req);
864 goto out_ctx;
865 }
866 req->r_dentry = dget(dentry);
867 req->r_num_caps = 2;
868 mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED;
869 if (ceph_security_xattr_wanted(dir))
870 mask |= CEPH_CAP_XATTR_SHARED;
871 req->r_args.open.mask = cpu_to_le32(mask);
872 req->r_parent = dir;
873 if (req->r_op == CEPH_MDS_OP_CREATE)
874 req->r_mnt_idmap = mnt_idmap_get(idmap);
875 ihold(dir);
876 if (IS_ENCRYPTED(dir)) {
877 set_bit(CEPH_MDS_R_FSCRYPT_FILE, &req->r_req_flags);
878 err = fscrypt_prepare_lookup_partial(dir, dentry);
879 if (err < 0)
880 goto out_req;
881 }
882
883 if (flags & O_CREAT) {
884 struct ceph_file_layout lo;
885
886 req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL |
887 CEPH_CAP_XATTR_EXCL;
888 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
889
890 ceph_as_ctx_to_req(req, &as_ctx);
891
892 if (try_async && (req->r_dir_caps =
893 try_prep_async_create(dir, dentry, &lo,
894 &req->r_deleg_ino))) {
895 struct ceph_vino vino = { .ino = req->r_deleg_ino,
896 .snap = CEPH_NOSNAP };
897 struct ceph_dentry_info *di = ceph_dentry(dentry);
898
899 set_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags);
900 req->r_args.open.flags |= cpu_to_le32(CEPH_O_EXCL);
901 req->r_callback = ceph_async_create_cb;
902
903 /* Hash inode before RPC */
904 new_inode = ceph_get_inode(dir->i_sb, vino, new_inode);
905 if (IS_ERR(new_inode)) {
906 err = PTR_ERR(new_inode);
907 new_inode = NULL;
908 goto out_req;
909 }
910 WARN_ON_ONCE(!(new_inode->i_state & I_NEW));
911
912 spin_lock(&dentry->d_lock);
913 di->flags |= CEPH_DENTRY_ASYNC_CREATE;
914 spin_unlock(&dentry->d_lock);
915
916 err = ceph_mdsc_submit_request(mdsc, dir, req);
917 if (!err) {
918 err = ceph_finish_async_create(dir, new_inode,
919 dentry, file,
920 mode, req,
921 &as_ctx, &lo);
922 new_inode = NULL;
923 } else if (err == -EJUKEBOX) {
924 restore_deleg_ino(dir, req->r_deleg_ino);
925 ceph_mdsc_put_request(req);
926 discard_new_inode(new_inode);
927 ceph_release_acl_sec_ctx(&as_ctx);
928 memset(&as_ctx, 0, sizeof(as_ctx));
929 new_inode = NULL;
930 try_async = false;
931 ceph_put_string(rcu_dereference_raw(lo.pool_ns));
932 goto retry;
933 }
934 ceph_put_string(rcu_dereference_raw(lo.pool_ns));
935 goto out_req;
936 }
937 }
938
939 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
940 req->r_new_inode = new_inode;
941 new_inode = NULL;
942 err = ceph_mdsc_do_request(mdsc, (flags & O_CREAT) ? dir : NULL, req);
943 if (err == -ENOENT) {
944 dentry = ceph_handle_snapdir(req, dentry);
945 if (IS_ERR(dentry)) {
946 err = PTR_ERR(dentry);
947 goto out_req;
948 }
949 err = 0;
950 }
951
952 if (!err && (flags & O_CREAT) && !req->r_reply_info.head->is_dentry)
953 err = ceph_handle_notrace_create(dir, dentry);
954
955 if (d_in_lookup(dentry)) {
956 dn = ceph_finish_lookup(req, dentry, err);
957 if (IS_ERR(dn))
958 err = PTR_ERR(dn);
959 } else {
960 /* we were given a hashed negative dentry */
961 dn = NULL;
962 }
963 if (err)
964 goto out_req;
965 if (dn || d_really_is_negative(dentry) || d_is_symlink(dentry)) {
966 /* make vfs retry on splice, ENOENT, or symlink */
967 doutc(cl, "finish_no_open on dn %p\n", dn);
968 err = finish_no_open(file, dn);
969 } else {
970 if (IS_ENCRYPTED(dir) &&
971 !fscrypt_has_permitted_context(dir, d_inode(dentry))) {
972 pr_warn_client(cl,
973 "Inconsistent encryption context (parent %llx:%llx child %llx:%llx)\n",
974 ceph_vinop(dir), ceph_vinop(d_inode(dentry)));
975 goto out_req;
976 }
977
978 doutc(cl, "finish_open on dn %p\n", dn);
979 if (req->r_op == CEPH_MDS_OP_CREATE && req->r_reply_info.has_create_ino) {
980 struct inode *newino = d_inode(dentry);
981
982 cache_file_layout(dir, newino);
983 ceph_init_inode_acls(newino, &as_ctx);
984 file->f_mode |= FMODE_CREATED;
985 }
986 err = finish_open(file, dentry, ceph_open);
987 }
988out_req:
989 ceph_mdsc_put_request(req);
990 iput(new_inode);
991out_ctx:
992 ceph_release_acl_sec_ctx(&as_ctx);
993 doutc(cl, "result=%d\n", err);
994 return err;
995}
996
997int ceph_release(struct inode *inode, struct file *file)
998{
999 struct ceph_client *cl = ceph_inode_to_client(inode);
1000 struct ceph_inode_info *ci = ceph_inode(inode);
1001
1002 if (S_ISDIR(inode->i_mode)) {
1003 struct ceph_dir_file_info *dfi = file->private_data;
1004 doutc(cl, "%p %llx.%llx dir file %p\n", inode,
1005 ceph_vinop(inode), file);
1006 WARN_ON(!list_empty(&dfi->file_info.rw_contexts));
1007
1008 ceph_put_fmode(ci, dfi->file_info.fmode, 1);
1009
1010 if (dfi->last_readdir)
1011 ceph_mdsc_put_request(dfi->last_readdir);
1012 kfree(dfi->last_name);
1013 kfree(dfi->dir_info);
1014 kmem_cache_free(ceph_dir_file_cachep, dfi);
1015 } else {
1016 struct ceph_file_info *fi = file->private_data;
1017 doutc(cl, "%p %llx.%llx regular file %p\n", inode,
1018 ceph_vinop(inode), file);
1019 WARN_ON(!list_empty(&fi->rw_contexts));
1020
1021 ceph_fscache_unuse_cookie(inode, file->f_mode & FMODE_WRITE);
1022 ceph_put_fmode(ci, fi->fmode, 1);
1023
1024 kmem_cache_free(ceph_file_cachep, fi);
1025 }
1026
1027 /* wake up anyone waiting for caps on this inode */
1028 wake_up_all(&ci->i_cap_wq);
1029 return 0;
1030}
1031
1032enum {
1033 HAVE_RETRIED = 1,
1034 CHECK_EOF = 2,
1035 READ_INLINE = 3,
1036};
1037
1038/*
1039 * Completely synchronous read and write methods. Direct from __user
1040 * buffer to osd, or directly to user pages (if O_DIRECT).
1041 *
1042 * If the read spans object boundary, just do multiple reads. (That's not
1043 * atomic, but good enough for now.)
1044 *
1045 * If we get a short result from the OSD, check against i_size; we need to
1046 * only return a short read to the caller if we hit EOF.
1047 */
1048ssize_t __ceph_sync_read(struct inode *inode, loff_t *ki_pos,
1049 struct iov_iter *to, int *retry_op,
1050 u64 *last_objver)
1051{
1052 struct ceph_inode_info *ci = ceph_inode(inode);
1053 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
1054 struct ceph_client *cl = fsc->client;
1055 struct ceph_osd_client *osdc = &fsc->client->osdc;
1056 ssize_t ret;
1057 u64 off = *ki_pos;
1058 u64 len = iov_iter_count(to);
1059 u64 i_size = i_size_read(inode);
1060 bool sparse = IS_ENCRYPTED(inode) || ceph_test_mount_opt(fsc, SPARSEREAD);
1061 u64 objver = 0;
1062
1063 doutc(cl, "on inode %p %llx.%llx %llx~%llx\n", inode,
1064 ceph_vinop(inode), *ki_pos, len);
1065
1066 if (ceph_inode_is_shutdown(inode))
1067 return -EIO;
1068
1069 if (!len || !i_size)
1070 return 0;
1071 /*
1072 * flush any page cache pages in this range. this
1073 * will make concurrent normal and sync io slow,
1074 * but it will at least behave sensibly when they are
1075 * in sequence.
1076 */
1077 ret = filemap_write_and_wait_range(inode->i_mapping,
1078 off, off + len - 1);
1079 if (ret < 0)
1080 return ret;
1081
1082 ret = 0;
1083 while ((len = iov_iter_count(to)) > 0) {
1084 struct ceph_osd_request *req;
1085 struct page **pages;
1086 int num_pages;
1087 size_t page_off;
1088 bool more;
1089 int idx = 0;
1090 size_t left;
1091 struct ceph_osd_req_op *op;
1092 u64 read_off = off;
1093 u64 read_len = len;
1094 int extent_cnt;
1095
1096 /* determine new offset/length if encrypted */
1097 ceph_fscrypt_adjust_off_and_len(inode, &read_off, &read_len);
1098
1099 doutc(cl, "orig %llu~%llu reading %llu~%llu", off, len,
1100 read_off, read_len);
1101
1102 req = ceph_osdc_new_request(osdc, &ci->i_layout,
1103 ci->i_vino, read_off, &read_len, 0, 1,
1104 sparse ? CEPH_OSD_OP_SPARSE_READ :
1105 CEPH_OSD_OP_READ,
1106 CEPH_OSD_FLAG_READ,
1107 NULL, ci->i_truncate_seq,
1108 ci->i_truncate_size, false);
1109 if (IS_ERR(req)) {
1110 ret = PTR_ERR(req);
1111 break;
1112 }
1113
1114 /* adjust len downward if the request truncated the len */
1115 if (off + len > read_off + read_len)
1116 len = read_off + read_len - off;
1117 more = len < iov_iter_count(to);
1118
1119 op = &req->r_ops[0];
1120 if (sparse) {
1121 extent_cnt = __ceph_sparse_read_ext_count(inode, read_len);
1122 ret = ceph_alloc_sparse_ext_map(op, extent_cnt);
1123 if (ret) {
1124 ceph_osdc_put_request(req);
1125 break;
1126 }
1127 }
1128
1129 num_pages = calc_pages_for(read_off, read_len);
1130 page_off = offset_in_page(off);
1131 pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL);
1132 if (IS_ERR(pages)) {
1133 ceph_osdc_put_request(req);
1134 ret = PTR_ERR(pages);
1135 break;
1136 }
1137
1138 osd_req_op_extent_osd_data_pages(req, 0, pages, read_len,
1139 offset_in_page(read_off),
1140 false, true);
1141
1142 ceph_osdc_start_request(osdc, req);
1143 ret = ceph_osdc_wait_request(osdc, req);
1144
1145 ceph_update_read_metrics(&fsc->mdsc->metric,
1146 req->r_start_latency,
1147 req->r_end_latency,
1148 read_len, ret);
1149
1150 if (ret > 0)
1151 objver = req->r_version;
1152
1153 i_size = i_size_read(inode);
1154 doutc(cl, "%llu~%llu got %zd i_size %llu%s\n", off, len,
1155 ret, i_size, (more ? " MORE" : ""));
1156
1157 /* Fix it to go to end of extent map */
1158 if (sparse && ret >= 0)
1159 ret = ceph_sparse_ext_map_end(op);
1160 else if (ret == -ENOENT)
1161 ret = 0;
1162
1163 if (ret < 0) {
1164 ceph_osdc_put_request(req);
1165 if (ret == -EBLOCKLISTED)
1166 fsc->blocklisted = true;
1167 break;
1168 }
1169
1170 if (IS_ENCRYPTED(inode)) {
1171 int fret;
1172
1173 fret = ceph_fscrypt_decrypt_extents(inode, pages,
1174 read_off, op->extent.sparse_ext,
1175 op->extent.sparse_ext_cnt);
1176 if (fret < 0) {
1177 ret = fret;
1178 ceph_osdc_put_request(req);
1179 break;
1180 }
1181
1182 /* account for any partial block at the beginning */
1183 fret -= (off - read_off);
1184
1185 /*
1186 * Short read after big offset adjustment?
1187 * Nothing is usable, just call it a zero
1188 * len read.
1189 */
1190 fret = max(fret, 0);
1191
1192 /* account for partial block at the end */
1193 ret = min_t(ssize_t, fret, len);
1194 }
1195
1196 /* Short read but not EOF? Zero out the remainder. */
1197 if (ret < len && (off + ret < i_size)) {
1198 int zlen = min(len - ret, i_size - off - ret);
1199 int zoff = page_off + ret;
1200
1201 doutc(cl, "zero gap %llu~%llu\n", off + ret,
1202 off + ret + zlen);
1203 ceph_zero_page_vector_range(zoff, zlen, pages);
1204 ret += zlen;
1205 }
1206
1207 if (off + ret > i_size)
1208 left = (i_size > off) ? i_size - off : 0;
1209 else
1210 left = ret;
1211
1212 while (left > 0) {
1213 size_t plen, copied;
1214
1215 plen = min_t(size_t, left, PAGE_SIZE - page_off);
1216 SetPageUptodate(pages[idx]);
1217 copied = copy_page_to_iter(pages[idx++],
1218 page_off, plen, to);
1219 off += copied;
1220 left -= copied;
1221 page_off = 0;
1222 if (copied < plen) {
1223 ret = -EFAULT;
1224 break;
1225 }
1226 }
1227
1228 ceph_osdc_put_request(req);
1229
1230 if (off >= i_size || !more)
1231 break;
1232 }
1233
1234 if (ret > 0) {
1235 if (off >= i_size) {
1236 *retry_op = CHECK_EOF;
1237 ret = i_size - *ki_pos;
1238 *ki_pos = i_size;
1239 } else {
1240 ret = off - *ki_pos;
1241 *ki_pos = off;
1242 }
1243
1244 if (last_objver)
1245 *last_objver = objver;
1246 }
1247 doutc(cl, "result %zd retry_op %d\n", ret, *retry_op);
1248 return ret;
1249}
1250
1251static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *to,
1252 int *retry_op)
1253{
1254 struct file *file = iocb->ki_filp;
1255 struct inode *inode = file_inode(file);
1256 struct ceph_client *cl = ceph_inode_to_client(inode);
1257
1258 doutc(cl, "on file %p %llx~%zx %s\n", file, iocb->ki_pos,
1259 iov_iter_count(to),
1260 (file->f_flags & O_DIRECT) ? "O_DIRECT" : "");
1261
1262 return __ceph_sync_read(inode, &iocb->ki_pos, to, retry_op, NULL);
1263}
1264
1265struct ceph_aio_request {
1266 struct kiocb *iocb;
1267 size_t total_len;
1268 bool write;
1269 bool should_dirty;
1270 int error;
1271 struct list_head osd_reqs;
1272 unsigned num_reqs;
1273 atomic_t pending_reqs;
1274 struct timespec64 mtime;
1275 struct ceph_cap_flush *prealloc_cf;
1276};
1277
1278struct ceph_aio_work {
1279 struct work_struct work;
1280 struct ceph_osd_request *req;
1281};
1282
1283static void ceph_aio_retry_work(struct work_struct *work);
1284
1285static void ceph_aio_complete(struct inode *inode,
1286 struct ceph_aio_request *aio_req)
1287{
1288 struct ceph_client *cl = ceph_inode_to_client(inode);
1289 struct ceph_inode_info *ci = ceph_inode(inode);
1290 int ret;
1291
1292 if (!atomic_dec_and_test(&aio_req->pending_reqs))
1293 return;
1294
1295 if (aio_req->iocb->ki_flags & IOCB_DIRECT)
1296 inode_dio_end(inode);
1297
1298 ret = aio_req->error;
1299 if (!ret)
1300 ret = aio_req->total_len;
1301
1302 doutc(cl, "%p %llx.%llx rc %d\n", inode, ceph_vinop(inode), ret);
1303
1304 if (ret >= 0 && aio_req->write) {
1305 int dirty;
1306
1307 loff_t endoff = aio_req->iocb->ki_pos + aio_req->total_len;
1308 if (endoff > i_size_read(inode)) {
1309 if (ceph_inode_set_size(inode, endoff))
1310 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY);
1311 }
1312
1313 spin_lock(&ci->i_ceph_lock);
1314 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
1315 &aio_req->prealloc_cf);
1316 spin_unlock(&ci->i_ceph_lock);
1317 if (dirty)
1318 __mark_inode_dirty(inode, dirty);
1319
1320 }
1321
1322 ceph_put_cap_refs(ci, (aio_req->write ? CEPH_CAP_FILE_WR :
1323 CEPH_CAP_FILE_RD));
1324
1325 aio_req->iocb->ki_complete(aio_req->iocb, ret);
1326
1327 ceph_free_cap_flush(aio_req->prealloc_cf);
1328 kfree(aio_req);
1329}
1330
1331static void ceph_aio_complete_req(struct ceph_osd_request *req)
1332{
1333 int rc = req->r_result;
1334 struct inode *inode = req->r_inode;
1335 struct ceph_aio_request *aio_req = req->r_priv;
1336 struct ceph_osd_data *osd_data = osd_req_op_extent_osd_data(req, 0);
1337 struct ceph_osd_req_op *op = &req->r_ops[0];
1338 struct ceph_client_metric *metric = &ceph_sb_to_mdsc(inode->i_sb)->metric;
1339 unsigned int len = osd_data->bvec_pos.iter.bi_size;
1340 bool sparse = (op->op == CEPH_OSD_OP_SPARSE_READ);
1341 struct ceph_client *cl = ceph_inode_to_client(inode);
1342
1343 BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_BVECS);
1344 BUG_ON(!osd_data->num_bvecs);
1345
1346 doutc(cl, "req %p inode %p %llx.%llx, rc %d bytes %u\n", req,
1347 inode, ceph_vinop(inode), rc, len);
1348
1349 if (rc == -EOLDSNAPC) {
1350 struct ceph_aio_work *aio_work;
1351 BUG_ON(!aio_req->write);
1352
1353 aio_work = kmalloc(sizeof(*aio_work), GFP_NOFS);
1354 if (aio_work) {
1355 INIT_WORK(&aio_work->work, ceph_aio_retry_work);
1356 aio_work->req = req;
1357 queue_work(ceph_inode_to_fs_client(inode)->inode_wq,
1358 &aio_work->work);
1359 return;
1360 }
1361 rc = -ENOMEM;
1362 } else if (!aio_req->write) {
1363 if (sparse && rc >= 0)
1364 rc = ceph_sparse_ext_map_end(op);
1365 if (rc == -ENOENT)
1366 rc = 0;
1367 if (rc >= 0 && len > rc) {
1368 struct iov_iter i;
1369 int zlen = len - rc;
1370
1371 /*
1372 * If read is satisfied by single OSD request,
1373 * it can pass EOF. Otherwise read is within
1374 * i_size.
1375 */
1376 if (aio_req->num_reqs == 1) {
1377 loff_t i_size = i_size_read(inode);
1378 loff_t endoff = aio_req->iocb->ki_pos + rc;
1379 if (endoff < i_size)
1380 zlen = min_t(size_t, zlen,
1381 i_size - endoff);
1382 aio_req->total_len = rc + zlen;
1383 }
1384
1385 iov_iter_bvec(&i, ITER_DEST, osd_data->bvec_pos.bvecs,
1386 osd_data->num_bvecs, len);
1387 iov_iter_advance(&i, rc);
1388 iov_iter_zero(zlen, &i);
1389 }
1390 }
1391
1392 /* r_start_latency == 0 means the request was not submitted */
1393 if (req->r_start_latency) {
1394 if (aio_req->write)
1395 ceph_update_write_metrics(metric, req->r_start_latency,
1396 req->r_end_latency, len, rc);
1397 else
1398 ceph_update_read_metrics(metric, req->r_start_latency,
1399 req->r_end_latency, len, rc);
1400 }
1401
1402 put_bvecs(osd_data->bvec_pos.bvecs, osd_data->num_bvecs,
1403 aio_req->should_dirty);
1404 ceph_osdc_put_request(req);
1405
1406 if (rc < 0)
1407 cmpxchg(&aio_req->error, 0, rc);
1408
1409 ceph_aio_complete(inode, aio_req);
1410 return;
1411}
1412
1413static void ceph_aio_retry_work(struct work_struct *work)
1414{
1415 struct ceph_aio_work *aio_work =
1416 container_of(work, struct ceph_aio_work, work);
1417 struct ceph_osd_request *orig_req = aio_work->req;
1418 struct ceph_aio_request *aio_req = orig_req->r_priv;
1419 struct inode *inode = orig_req->r_inode;
1420 struct ceph_inode_info *ci = ceph_inode(inode);
1421 struct ceph_snap_context *snapc;
1422 struct ceph_osd_request *req;
1423 int ret;
1424
1425 spin_lock(&ci->i_ceph_lock);
1426 if (__ceph_have_pending_cap_snap(ci)) {
1427 struct ceph_cap_snap *capsnap =
1428 list_last_entry(&ci->i_cap_snaps,
1429 struct ceph_cap_snap,
1430 ci_item);
1431 snapc = ceph_get_snap_context(capsnap->context);
1432 } else {
1433 BUG_ON(!ci->i_head_snapc);
1434 snapc = ceph_get_snap_context(ci->i_head_snapc);
1435 }
1436 spin_unlock(&ci->i_ceph_lock);
1437
1438 req = ceph_osdc_alloc_request(orig_req->r_osdc, snapc, 1,
1439 false, GFP_NOFS);
1440 if (!req) {
1441 ret = -ENOMEM;
1442 req = orig_req;
1443 goto out;
1444 }
1445
1446 req->r_flags = /* CEPH_OSD_FLAG_ORDERSNAP | */ CEPH_OSD_FLAG_WRITE;
1447 ceph_oloc_copy(&req->r_base_oloc, &orig_req->r_base_oloc);
1448 ceph_oid_copy(&req->r_base_oid, &orig_req->r_base_oid);
1449
1450 req->r_ops[0] = orig_req->r_ops[0];
1451
1452 req->r_mtime = aio_req->mtime;
1453 req->r_data_offset = req->r_ops[0].extent.offset;
1454
1455 ret = ceph_osdc_alloc_messages(req, GFP_NOFS);
1456 if (ret) {
1457 ceph_osdc_put_request(req);
1458 req = orig_req;
1459 goto out;
1460 }
1461
1462 ceph_osdc_put_request(orig_req);
1463
1464 req->r_callback = ceph_aio_complete_req;
1465 req->r_inode = inode;
1466 req->r_priv = aio_req;
1467
1468 ceph_osdc_start_request(req->r_osdc, req);
1469out:
1470 if (ret < 0) {
1471 req->r_result = ret;
1472 ceph_aio_complete_req(req);
1473 }
1474
1475 ceph_put_snap_context(snapc);
1476 kfree(aio_work);
1477}
1478
1479static ssize_t
1480ceph_direct_read_write(struct kiocb *iocb, struct iov_iter *iter,
1481 struct ceph_snap_context *snapc,
1482 struct ceph_cap_flush **pcf)
1483{
1484 struct file *file = iocb->ki_filp;
1485 struct inode *inode = file_inode(file);
1486 struct ceph_inode_info *ci = ceph_inode(inode);
1487 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
1488 struct ceph_client *cl = fsc->client;
1489 struct ceph_client_metric *metric = &fsc->mdsc->metric;
1490 struct ceph_vino vino;
1491 struct ceph_osd_request *req;
1492 struct bio_vec *bvecs;
1493 struct ceph_aio_request *aio_req = NULL;
1494 int num_pages = 0;
1495 int flags;
1496 int ret = 0;
1497 struct timespec64 mtime = current_time(inode);
1498 size_t count = iov_iter_count(iter);
1499 loff_t pos = iocb->ki_pos;
1500 bool write = iov_iter_rw(iter) == WRITE;
1501 bool should_dirty = !write && user_backed_iter(iter);
1502 bool sparse = ceph_test_mount_opt(fsc, SPARSEREAD);
1503
1504 if (write && ceph_snap(file_inode(file)) != CEPH_NOSNAP)
1505 return -EROFS;
1506
1507 doutc(cl, "sync_direct_%s on file %p %lld~%u snapc %p seq %lld\n",
1508 (write ? "write" : "read"), file, pos, (unsigned)count,
1509 snapc, snapc ? snapc->seq : 0);
1510
1511 if (write) {
1512 int ret2;
1513
1514 ceph_fscache_invalidate(inode, true);
1515
1516 ret2 = invalidate_inode_pages2_range(inode->i_mapping,
1517 pos >> PAGE_SHIFT,
1518 (pos + count - 1) >> PAGE_SHIFT);
1519 if (ret2 < 0)
1520 doutc(cl, "invalidate_inode_pages2_range returned %d\n",
1521 ret2);
1522
1523 flags = /* CEPH_OSD_FLAG_ORDERSNAP | */ CEPH_OSD_FLAG_WRITE;
1524 } else {
1525 flags = CEPH_OSD_FLAG_READ;
1526 }
1527
1528 while (iov_iter_count(iter) > 0) {
1529 u64 size = iov_iter_count(iter);
1530 ssize_t len;
1531 struct ceph_osd_req_op *op;
1532 int readop = sparse ? CEPH_OSD_OP_SPARSE_READ : CEPH_OSD_OP_READ;
1533 int extent_cnt;
1534
1535 if (write)
1536 size = min_t(u64, size, fsc->mount_options->wsize);
1537 else
1538 size = min_t(u64, size, fsc->mount_options->rsize);
1539
1540 vino = ceph_vino(inode);
1541 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1542 vino, pos, &size, 0,
1543 1,
1544 write ? CEPH_OSD_OP_WRITE : readop,
1545 flags, snapc,
1546 ci->i_truncate_seq,
1547 ci->i_truncate_size,
1548 false);
1549 if (IS_ERR(req)) {
1550 ret = PTR_ERR(req);
1551 break;
1552 }
1553
1554 op = &req->r_ops[0];
1555 if (!write && sparse) {
1556 extent_cnt = __ceph_sparse_read_ext_count(inode, size);
1557 ret = ceph_alloc_sparse_ext_map(op, extent_cnt);
1558 if (ret) {
1559 ceph_osdc_put_request(req);
1560 break;
1561 }
1562 }
1563
1564 len = iter_get_bvecs_alloc(iter, size, &bvecs, &num_pages);
1565 if (len < 0) {
1566 ceph_osdc_put_request(req);
1567 ret = len;
1568 break;
1569 }
1570 if (len != size)
1571 osd_req_op_extent_update(req, 0, len);
1572
1573 osd_req_op_extent_osd_data_bvecs(req, 0, bvecs, num_pages, len);
1574
1575 /*
1576 * To simplify error handling, allow AIO when IO within i_size
1577 * or IO can be satisfied by single OSD request.
1578 */
1579 if (pos == iocb->ki_pos && !is_sync_kiocb(iocb) &&
1580 (len == count || pos + count <= i_size_read(inode))) {
1581 aio_req = kzalloc(sizeof(*aio_req), GFP_KERNEL);
1582 if (aio_req) {
1583 aio_req->iocb = iocb;
1584 aio_req->write = write;
1585 aio_req->should_dirty = should_dirty;
1586 INIT_LIST_HEAD(&aio_req->osd_reqs);
1587 if (write) {
1588 aio_req->mtime = mtime;
1589 swap(aio_req->prealloc_cf, *pcf);
1590 }
1591 }
1592 /* ignore error */
1593 }
1594
1595 if (write) {
1596 /*
1597 * throw out any page cache pages in this range. this
1598 * may block.
1599 */
1600 truncate_inode_pages_range(inode->i_mapping, pos,
1601 PAGE_ALIGN(pos + len) - 1);
1602
1603 req->r_mtime = mtime;
1604 }
1605
1606 if (aio_req) {
1607 aio_req->total_len += len;
1608 aio_req->num_reqs++;
1609 atomic_inc(&aio_req->pending_reqs);
1610
1611 req->r_callback = ceph_aio_complete_req;
1612 req->r_inode = inode;
1613 req->r_priv = aio_req;
1614 list_add_tail(&req->r_private_item, &aio_req->osd_reqs);
1615
1616 pos += len;
1617 continue;
1618 }
1619
1620 ceph_osdc_start_request(req->r_osdc, req);
1621 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
1622
1623 if (write)
1624 ceph_update_write_metrics(metric, req->r_start_latency,
1625 req->r_end_latency, len, ret);
1626 else
1627 ceph_update_read_metrics(metric, req->r_start_latency,
1628 req->r_end_latency, len, ret);
1629
1630 size = i_size_read(inode);
1631 if (!write) {
1632 if (sparse && ret >= 0)
1633 ret = ceph_sparse_ext_map_end(op);
1634 else if (ret == -ENOENT)
1635 ret = 0;
1636
1637 if (ret >= 0 && ret < len && pos + ret < size) {
1638 struct iov_iter i;
1639 int zlen = min_t(size_t, len - ret,
1640 size - pos - ret);
1641
1642 iov_iter_bvec(&i, ITER_DEST, bvecs, num_pages, len);
1643 iov_iter_advance(&i, ret);
1644 iov_iter_zero(zlen, &i);
1645 ret += zlen;
1646 }
1647 if (ret >= 0)
1648 len = ret;
1649 }
1650
1651 put_bvecs(bvecs, num_pages, should_dirty);
1652 ceph_osdc_put_request(req);
1653 if (ret < 0)
1654 break;
1655
1656 pos += len;
1657 if (!write && pos >= size)
1658 break;
1659
1660 if (write && pos > size) {
1661 if (ceph_inode_set_size(inode, pos))
1662 ceph_check_caps(ceph_inode(inode),
1663 CHECK_CAPS_AUTHONLY);
1664 }
1665 }
1666
1667 if (aio_req) {
1668 LIST_HEAD(osd_reqs);
1669
1670 if (aio_req->num_reqs == 0) {
1671 kfree(aio_req);
1672 return ret;
1673 }
1674
1675 ceph_get_cap_refs(ci, write ? CEPH_CAP_FILE_WR :
1676 CEPH_CAP_FILE_RD);
1677
1678 list_splice(&aio_req->osd_reqs, &osd_reqs);
1679 inode_dio_begin(inode);
1680 while (!list_empty(&osd_reqs)) {
1681 req = list_first_entry(&osd_reqs,
1682 struct ceph_osd_request,
1683 r_private_item);
1684 list_del_init(&req->r_private_item);
1685 if (ret >= 0)
1686 ceph_osdc_start_request(req->r_osdc, req);
1687 if (ret < 0) {
1688 req->r_result = ret;
1689 ceph_aio_complete_req(req);
1690 }
1691 }
1692 return -EIOCBQUEUED;
1693 }
1694
1695 if (ret != -EOLDSNAPC && pos > iocb->ki_pos) {
1696 ret = pos - iocb->ki_pos;
1697 iocb->ki_pos = pos;
1698 }
1699 return ret;
1700}
1701
1702/*
1703 * Synchronous write, straight from __user pointer or user pages.
1704 *
1705 * If write spans object boundary, just do multiple writes. (For a
1706 * correct atomic write, we should e.g. take write locks on all
1707 * objects, rollback on failure, etc.)
1708 */
1709static ssize_t
1710ceph_sync_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos,
1711 struct ceph_snap_context *snapc)
1712{
1713 struct file *file = iocb->ki_filp;
1714 struct inode *inode = file_inode(file);
1715 struct ceph_inode_info *ci = ceph_inode(inode);
1716 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
1717 struct ceph_client *cl = fsc->client;
1718 struct ceph_osd_client *osdc = &fsc->client->osdc;
1719 struct ceph_osd_request *req;
1720 struct page **pages;
1721 u64 len;
1722 int num_pages;
1723 int written = 0;
1724 int ret;
1725 bool check_caps = false;
1726 struct timespec64 mtime = current_time(inode);
1727 size_t count = iov_iter_count(from);
1728
1729 if (ceph_snap(file_inode(file)) != CEPH_NOSNAP)
1730 return -EROFS;
1731
1732 doutc(cl, "on file %p %lld~%u snapc %p seq %lld\n", file, pos,
1733 (unsigned)count, snapc, snapc->seq);
1734
1735 ret = filemap_write_and_wait_range(inode->i_mapping,
1736 pos, pos + count - 1);
1737 if (ret < 0)
1738 return ret;
1739
1740 ceph_fscache_invalidate(inode, false);
1741
1742 while ((len = iov_iter_count(from)) > 0) {
1743 size_t left;
1744 int n;
1745 u64 write_pos = pos;
1746 u64 write_len = len;
1747 u64 objnum, objoff;
1748 u32 xlen;
1749 u64 assert_ver = 0;
1750 bool rmw;
1751 bool first, last;
1752 struct iov_iter saved_iter = *from;
1753 size_t off;
1754
1755 ceph_fscrypt_adjust_off_and_len(inode, &write_pos, &write_len);
1756
1757 /* clamp the length to the end of first object */
1758 ceph_calc_file_object_mapping(&ci->i_layout, write_pos,
1759 write_len, &objnum, &objoff,
1760 &xlen);
1761 write_len = xlen;
1762
1763 /* adjust len downward if it goes beyond current object */
1764 if (pos + len > write_pos + write_len)
1765 len = write_pos + write_len - pos;
1766
1767 /*
1768 * If we had to adjust the length or position to align with a
1769 * crypto block, then we must do a read/modify/write cycle. We
1770 * use a version assertion to redrive the thing if something
1771 * changes in between.
1772 */
1773 first = pos != write_pos;
1774 last = (pos + len) != (write_pos + write_len);
1775 rmw = first || last;
1776
1777 doutc(cl, "ino %llx %lld~%llu adjusted %lld~%llu -- %srmw\n",
1778 ci->i_vino.ino, pos, len, write_pos, write_len,
1779 rmw ? "" : "no ");
1780
1781 /*
1782 * The data is emplaced into the page as it would be if it were
1783 * in an array of pagecache pages.
1784 */
1785 num_pages = calc_pages_for(write_pos, write_len);
1786 pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL);
1787 if (IS_ERR(pages)) {
1788 ret = PTR_ERR(pages);
1789 break;
1790 }
1791
1792 /* Do we need to preload the pages? */
1793 if (rmw) {
1794 u64 first_pos = write_pos;
1795 u64 last_pos = (write_pos + write_len) - CEPH_FSCRYPT_BLOCK_SIZE;
1796 u64 read_len = CEPH_FSCRYPT_BLOCK_SIZE;
1797 struct ceph_osd_req_op *op;
1798
1799 /* We should only need to do this for encrypted inodes */
1800 WARN_ON_ONCE(!IS_ENCRYPTED(inode));
1801
1802 /* No need to do two reads if first and last blocks are same */
1803 if (first && last_pos == first_pos)
1804 last = false;
1805
1806 /*
1807 * Allocate a read request for one or two extents,
1808 * depending on how the request was aligned.
1809 */
1810 req = ceph_osdc_new_request(osdc, &ci->i_layout,
1811 ci->i_vino, first ? first_pos : last_pos,
1812 &read_len, 0, (first && last) ? 2 : 1,
1813 CEPH_OSD_OP_SPARSE_READ, CEPH_OSD_FLAG_READ,
1814 NULL, ci->i_truncate_seq,
1815 ci->i_truncate_size, false);
1816 if (IS_ERR(req)) {
1817 ceph_release_page_vector(pages, num_pages);
1818 ret = PTR_ERR(req);
1819 break;
1820 }
1821
1822 /* Something is misaligned! */
1823 if (read_len != CEPH_FSCRYPT_BLOCK_SIZE) {
1824 ceph_osdc_put_request(req);
1825 ceph_release_page_vector(pages, num_pages);
1826 ret = -EIO;
1827 break;
1828 }
1829
1830 /* Add extent for first block? */
1831 op = &req->r_ops[0];
1832
1833 if (first) {
1834 osd_req_op_extent_osd_data_pages(req, 0, pages,
1835 CEPH_FSCRYPT_BLOCK_SIZE,
1836 offset_in_page(first_pos),
1837 false, false);
1838 /* We only expect a single extent here */
1839 ret = __ceph_alloc_sparse_ext_map(op, 1);
1840 if (ret) {
1841 ceph_osdc_put_request(req);
1842 ceph_release_page_vector(pages, num_pages);
1843 break;
1844 }
1845 }
1846
1847 /* Add extent for last block */
1848 if (last) {
1849 /* Init the other extent if first extent has been used */
1850 if (first) {
1851 op = &req->r_ops[1];
1852 osd_req_op_extent_init(req, 1,
1853 CEPH_OSD_OP_SPARSE_READ,
1854 last_pos, CEPH_FSCRYPT_BLOCK_SIZE,
1855 ci->i_truncate_size,
1856 ci->i_truncate_seq);
1857 }
1858
1859 ret = __ceph_alloc_sparse_ext_map(op, 1);
1860 if (ret) {
1861 ceph_osdc_put_request(req);
1862 ceph_release_page_vector(pages, num_pages);
1863 break;
1864 }
1865
1866 osd_req_op_extent_osd_data_pages(req, first ? 1 : 0,
1867 &pages[num_pages - 1],
1868 CEPH_FSCRYPT_BLOCK_SIZE,
1869 offset_in_page(last_pos),
1870 false, false);
1871 }
1872
1873 ceph_osdc_start_request(osdc, req);
1874 ret = ceph_osdc_wait_request(osdc, req);
1875
1876 /* FIXME: length field is wrong if there are 2 extents */
1877 ceph_update_read_metrics(&fsc->mdsc->metric,
1878 req->r_start_latency,
1879 req->r_end_latency,
1880 read_len, ret);
1881
1882 /* Ok if object is not already present */
1883 if (ret == -ENOENT) {
1884 /*
1885 * If there is no object, then we can't assert
1886 * on its version. Set it to 0, and we'll use an
1887 * exclusive create instead.
1888 */
1889 ceph_osdc_put_request(req);
1890 ret = 0;
1891
1892 /*
1893 * zero out the soon-to-be uncopied parts of the
1894 * first and last pages.
1895 */
1896 if (first)
1897 zero_user_segment(pages[0], 0,
1898 offset_in_page(first_pos));
1899 if (last)
1900 zero_user_segment(pages[num_pages - 1],
1901 offset_in_page(last_pos),
1902 PAGE_SIZE);
1903 } else {
1904 if (ret < 0) {
1905 ceph_osdc_put_request(req);
1906 ceph_release_page_vector(pages, num_pages);
1907 break;
1908 }
1909
1910 op = &req->r_ops[0];
1911 if (op->extent.sparse_ext_cnt == 0) {
1912 if (first)
1913 zero_user_segment(pages[0], 0,
1914 offset_in_page(first_pos));
1915 else
1916 zero_user_segment(pages[num_pages - 1],
1917 offset_in_page(last_pos),
1918 PAGE_SIZE);
1919 } else if (op->extent.sparse_ext_cnt != 1 ||
1920 ceph_sparse_ext_map_end(op) !=
1921 CEPH_FSCRYPT_BLOCK_SIZE) {
1922 ret = -EIO;
1923 ceph_osdc_put_request(req);
1924 ceph_release_page_vector(pages, num_pages);
1925 break;
1926 }
1927
1928 if (first && last) {
1929 op = &req->r_ops[1];
1930 if (op->extent.sparse_ext_cnt == 0) {
1931 zero_user_segment(pages[num_pages - 1],
1932 offset_in_page(last_pos),
1933 PAGE_SIZE);
1934 } else if (op->extent.sparse_ext_cnt != 1 ||
1935 ceph_sparse_ext_map_end(op) !=
1936 CEPH_FSCRYPT_BLOCK_SIZE) {
1937 ret = -EIO;
1938 ceph_osdc_put_request(req);
1939 ceph_release_page_vector(pages, num_pages);
1940 break;
1941 }
1942 }
1943
1944 /* Grab assert version. It must be non-zero. */
1945 assert_ver = req->r_version;
1946 WARN_ON_ONCE(ret > 0 && assert_ver == 0);
1947
1948 ceph_osdc_put_request(req);
1949 if (first) {
1950 ret = ceph_fscrypt_decrypt_block_inplace(inode,
1951 pages[0], CEPH_FSCRYPT_BLOCK_SIZE,
1952 offset_in_page(first_pos),
1953 first_pos >> CEPH_FSCRYPT_BLOCK_SHIFT);
1954 if (ret < 0) {
1955 ceph_release_page_vector(pages, num_pages);
1956 break;
1957 }
1958 }
1959 if (last) {
1960 ret = ceph_fscrypt_decrypt_block_inplace(inode,
1961 pages[num_pages - 1],
1962 CEPH_FSCRYPT_BLOCK_SIZE,
1963 offset_in_page(last_pos),
1964 last_pos >> CEPH_FSCRYPT_BLOCK_SHIFT);
1965 if (ret < 0) {
1966 ceph_release_page_vector(pages, num_pages);
1967 break;
1968 }
1969 }
1970 }
1971 }
1972
1973 left = len;
1974 off = offset_in_page(pos);
1975 for (n = 0; n < num_pages; n++) {
1976 size_t plen = min_t(size_t, left, PAGE_SIZE - off);
1977
1978 /* copy the data */
1979 ret = copy_page_from_iter(pages[n], off, plen, from);
1980 if (ret != plen) {
1981 ret = -EFAULT;
1982 break;
1983 }
1984 off = 0;
1985 left -= ret;
1986 }
1987 if (ret < 0) {
1988 doutc(cl, "write failed with %d\n", ret);
1989 ceph_release_page_vector(pages, num_pages);
1990 break;
1991 }
1992
1993 if (IS_ENCRYPTED(inode)) {
1994 ret = ceph_fscrypt_encrypt_pages(inode, pages,
1995 write_pos, write_len,
1996 GFP_KERNEL);
1997 if (ret < 0) {
1998 doutc(cl, "encryption failed with %d\n", ret);
1999 ceph_release_page_vector(pages, num_pages);
2000 break;
2001 }
2002 }
2003
2004 req = ceph_osdc_new_request(osdc, &ci->i_layout,
2005 ci->i_vino, write_pos, &write_len,
2006 rmw ? 1 : 0, rmw ? 2 : 1,
2007 CEPH_OSD_OP_WRITE,
2008 CEPH_OSD_FLAG_WRITE,
2009 snapc, ci->i_truncate_seq,
2010 ci->i_truncate_size, false);
2011 if (IS_ERR(req)) {
2012 ret = PTR_ERR(req);
2013 ceph_release_page_vector(pages, num_pages);
2014 break;
2015 }
2016
2017 doutc(cl, "write op %lld~%llu\n", write_pos, write_len);
2018 osd_req_op_extent_osd_data_pages(req, rmw ? 1 : 0, pages, write_len,
2019 offset_in_page(write_pos), false,
2020 true);
2021 req->r_inode = inode;
2022 req->r_mtime = mtime;
2023
2024 /* Set up the assertion */
2025 if (rmw) {
2026 /*
2027 * Set up the assertion. If we don't have a version
2028 * number, then the object doesn't exist yet. Use an
2029 * exclusive create instead of a version assertion in
2030 * that case.
2031 */
2032 if (assert_ver) {
2033 osd_req_op_init(req, 0, CEPH_OSD_OP_ASSERT_VER, 0);
2034 req->r_ops[0].assert_ver.ver = assert_ver;
2035 } else {
2036 osd_req_op_init(req, 0, CEPH_OSD_OP_CREATE,
2037 CEPH_OSD_OP_FLAG_EXCL);
2038 }
2039 }
2040
2041 ceph_osdc_start_request(osdc, req);
2042 ret = ceph_osdc_wait_request(osdc, req);
2043
2044 ceph_update_write_metrics(&fsc->mdsc->metric, req->r_start_latency,
2045 req->r_end_latency, len, ret);
2046 ceph_osdc_put_request(req);
2047 if (ret != 0) {
2048 doutc(cl, "osd write returned %d\n", ret);
2049 /* Version changed! Must re-do the rmw cycle */
2050 if ((assert_ver && (ret == -ERANGE || ret == -EOVERFLOW)) ||
2051 (!assert_ver && ret == -EEXIST)) {
2052 /* We should only ever see this on a rmw */
2053 WARN_ON_ONCE(!rmw);
2054
2055 /* The version should never go backward */
2056 WARN_ON_ONCE(ret == -EOVERFLOW);
2057
2058 *from = saved_iter;
2059
2060 /* FIXME: limit number of times we loop? */
2061 continue;
2062 }
2063 ceph_set_error_write(ci);
2064 break;
2065 }
2066
2067 ceph_clear_error_write(ci);
2068
2069 /*
2070 * We successfully wrote to a range of the file. Declare
2071 * that region of the pagecache invalid.
2072 */
2073 ret = invalidate_inode_pages2_range(
2074 inode->i_mapping,
2075 pos >> PAGE_SHIFT,
2076 (pos + len - 1) >> PAGE_SHIFT);
2077 if (ret < 0) {
2078 doutc(cl, "invalidate_inode_pages2_range returned %d\n",
2079 ret);
2080 ret = 0;
2081 }
2082 pos += len;
2083 written += len;
2084 doutc(cl, "written %d\n", written);
2085 if (pos > i_size_read(inode)) {
2086 check_caps = ceph_inode_set_size(inode, pos);
2087 if (check_caps)
2088 ceph_check_caps(ceph_inode(inode),
2089 CHECK_CAPS_AUTHONLY);
2090 }
2091
2092 }
2093
2094 if (ret != -EOLDSNAPC && written > 0) {
2095 ret = written;
2096 iocb->ki_pos = pos;
2097 }
2098 doutc(cl, "returning %d\n", ret);
2099 return ret;
2100}
2101
2102/*
2103 * Wrap generic_file_aio_read with checks for cap bits on the inode.
2104 * Atomically grab references, so that those bits are not released
2105 * back to the MDS mid-read.
2106 *
2107 * Hmm, the sync read case isn't actually async... should it be?
2108 */
2109static ssize_t ceph_read_iter(struct kiocb *iocb, struct iov_iter *to)
2110{
2111 struct file *filp = iocb->ki_filp;
2112 struct ceph_file_info *fi = filp->private_data;
2113 size_t len = iov_iter_count(to);
2114 struct inode *inode = file_inode(filp);
2115 struct ceph_inode_info *ci = ceph_inode(inode);
2116 bool direct_lock = iocb->ki_flags & IOCB_DIRECT;
2117 struct ceph_client *cl = ceph_inode_to_client(inode);
2118 ssize_t ret;
2119 int want = 0, got = 0;
2120 int retry_op = 0, read = 0;
2121
2122again:
2123 doutc(cl, "%llu~%u trying to get caps on %p %llx.%llx\n",
2124 iocb->ki_pos, (unsigned)len, inode, ceph_vinop(inode));
2125
2126 if (ceph_inode_is_shutdown(inode))
2127 return -ESTALE;
2128
2129 if (direct_lock)
2130 ceph_start_io_direct(inode);
2131 else
2132 ceph_start_io_read(inode);
2133
2134 if (!(fi->flags & CEPH_F_SYNC) && !direct_lock)
2135 want |= CEPH_CAP_FILE_CACHE;
2136 if (fi->fmode & CEPH_FILE_MODE_LAZY)
2137 want |= CEPH_CAP_FILE_LAZYIO;
2138
2139 ret = ceph_get_caps(filp, CEPH_CAP_FILE_RD, want, -1, &got);
2140 if (ret < 0) {
2141 if (direct_lock)
2142 ceph_end_io_direct(inode);
2143 else
2144 ceph_end_io_read(inode);
2145 return ret;
2146 }
2147
2148 if ((got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0 ||
2149 (iocb->ki_flags & IOCB_DIRECT) ||
2150 (fi->flags & CEPH_F_SYNC)) {
2151
2152 doutc(cl, "sync %p %llx.%llx %llu~%u got cap refs on %s\n",
2153 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
2154 ceph_cap_string(got));
2155
2156 if (!ceph_has_inline_data(ci)) {
2157 if (!retry_op &&
2158 (iocb->ki_flags & IOCB_DIRECT) &&
2159 !IS_ENCRYPTED(inode)) {
2160 ret = ceph_direct_read_write(iocb, to,
2161 NULL, NULL);
2162 if (ret >= 0 && ret < len)
2163 retry_op = CHECK_EOF;
2164 } else {
2165 ret = ceph_sync_read(iocb, to, &retry_op);
2166 }
2167 } else {
2168 retry_op = READ_INLINE;
2169 }
2170 } else {
2171 CEPH_DEFINE_RW_CONTEXT(rw_ctx, got);
2172 doutc(cl, "async %p %llx.%llx %llu~%u got cap refs on %s\n",
2173 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
2174 ceph_cap_string(got));
2175 ceph_add_rw_context(fi, &rw_ctx);
2176 ret = generic_file_read_iter(iocb, to);
2177 ceph_del_rw_context(fi, &rw_ctx);
2178 }
2179
2180 doutc(cl, "%p %llx.%llx dropping cap refs on %s = %d\n",
2181 inode, ceph_vinop(inode), ceph_cap_string(got), (int)ret);
2182 ceph_put_cap_refs(ci, got);
2183
2184 if (direct_lock)
2185 ceph_end_io_direct(inode);
2186 else
2187 ceph_end_io_read(inode);
2188
2189 if (retry_op > HAVE_RETRIED && ret >= 0) {
2190 int statret;
2191 struct page *page = NULL;
2192 loff_t i_size;
2193 int mask = CEPH_STAT_CAP_SIZE;
2194 if (retry_op == READ_INLINE) {
2195 page = __page_cache_alloc(GFP_KERNEL);
2196 if (!page)
2197 return -ENOMEM;
2198
2199 mask = CEPH_STAT_CAP_INLINE_DATA;
2200 }
2201
2202 statret = __ceph_do_getattr(inode, page, mask, !!page);
2203 if (statret < 0) {
2204 if (page)
2205 __free_page(page);
2206 if (statret == -ENODATA) {
2207 BUG_ON(retry_op != READ_INLINE);
2208 goto again;
2209 }
2210 return statret;
2211 }
2212
2213 i_size = i_size_read(inode);
2214 if (retry_op == READ_INLINE) {
2215 BUG_ON(ret > 0 || read > 0);
2216 if (iocb->ki_pos < i_size &&
2217 iocb->ki_pos < PAGE_SIZE) {
2218 loff_t end = min_t(loff_t, i_size,
2219 iocb->ki_pos + len);
2220 end = min_t(loff_t, end, PAGE_SIZE);
2221 if (statret < end)
2222 zero_user_segment(page, statret, end);
2223 ret = copy_page_to_iter(page,
2224 iocb->ki_pos & ~PAGE_MASK,
2225 end - iocb->ki_pos, to);
2226 iocb->ki_pos += ret;
2227 read += ret;
2228 }
2229 if (iocb->ki_pos < i_size && read < len) {
2230 size_t zlen = min_t(size_t, len - read,
2231 i_size - iocb->ki_pos);
2232 ret = iov_iter_zero(zlen, to);
2233 iocb->ki_pos += ret;
2234 read += ret;
2235 }
2236 __free_pages(page, 0);
2237 return read;
2238 }
2239
2240 /* hit EOF or hole? */
2241 if (retry_op == CHECK_EOF && iocb->ki_pos < i_size &&
2242 ret < len) {
2243 doutc(cl, "may hit hole, ppos %lld < size %lld, reading more\n",
2244 iocb->ki_pos, i_size);
2245
2246 read += ret;
2247 len -= ret;
2248 retry_op = HAVE_RETRIED;
2249 goto again;
2250 }
2251 }
2252
2253 if (ret >= 0)
2254 ret += read;
2255
2256 return ret;
2257}
2258
2259/*
2260 * Wrap filemap_splice_read with checks for cap bits on the inode.
2261 * Atomically grab references, so that those bits are not released
2262 * back to the MDS mid-read.
2263 */
2264static ssize_t ceph_splice_read(struct file *in, loff_t *ppos,
2265 struct pipe_inode_info *pipe,
2266 size_t len, unsigned int flags)
2267{
2268 struct ceph_file_info *fi = in->private_data;
2269 struct inode *inode = file_inode(in);
2270 struct ceph_inode_info *ci = ceph_inode(inode);
2271 ssize_t ret;
2272 int want = 0, got = 0;
2273 CEPH_DEFINE_RW_CONTEXT(rw_ctx, 0);
2274
2275 dout("splice_read %p %llx.%llx %llu~%zu trying to get caps on %p\n",
2276 inode, ceph_vinop(inode), *ppos, len, inode);
2277
2278 if (ceph_inode_is_shutdown(inode))
2279 return -ESTALE;
2280
2281 if (ceph_has_inline_data(ci) ||
2282 (fi->flags & CEPH_F_SYNC))
2283 return copy_splice_read(in, ppos, pipe, len, flags);
2284
2285 ceph_start_io_read(inode);
2286
2287 want = CEPH_CAP_FILE_CACHE;
2288 if (fi->fmode & CEPH_FILE_MODE_LAZY)
2289 want |= CEPH_CAP_FILE_LAZYIO;
2290
2291 ret = ceph_get_caps(in, CEPH_CAP_FILE_RD, want, -1, &got);
2292 if (ret < 0)
2293 goto out_end;
2294
2295 if ((got & (CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO)) == 0) {
2296 dout("splice_read/sync %p %llx.%llx %llu~%zu got cap refs on %s\n",
2297 inode, ceph_vinop(inode), *ppos, len,
2298 ceph_cap_string(got));
2299
2300 ceph_put_cap_refs(ci, got);
2301 ceph_end_io_read(inode);
2302 return copy_splice_read(in, ppos, pipe, len, flags);
2303 }
2304
2305 dout("splice_read %p %llx.%llx %llu~%zu got cap refs on %s\n",
2306 inode, ceph_vinop(inode), *ppos, len, ceph_cap_string(got));
2307
2308 rw_ctx.caps = got;
2309 ceph_add_rw_context(fi, &rw_ctx);
2310 ret = filemap_splice_read(in, ppos, pipe, len, flags);
2311 ceph_del_rw_context(fi, &rw_ctx);
2312
2313 dout("splice_read %p %llx.%llx dropping cap refs on %s = %zd\n",
2314 inode, ceph_vinop(inode), ceph_cap_string(got), ret);
2315
2316 ceph_put_cap_refs(ci, got);
2317out_end:
2318 ceph_end_io_read(inode);
2319 return ret;
2320}
2321
2322/*
2323 * Take cap references to avoid releasing caps to MDS mid-write.
2324 *
2325 * If we are synchronous, and write with an old snap context, the OSD
2326 * may return EOLDSNAPC. In that case, retry the write.. _after_
2327 * dropping our cap refs and allowing the pending snap to logically
2328 * complete _before_ this write occurs.
2329 *
2330 * If we are near ENOSPC, write synchronously.
2331 */
2332static ssize_t ceph_write_iter(struct kiocb *iocb, struct iov_iter *from)
2333{
2334 struct file *file = iocb->ki_filp;
2335 struct ceph_file_info *fi = file->private_data;
2336 struct inode *inode = file_inode(file);
2337 struct ceph_inode_info *ci = ceph_inode(inode);
2338 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
2339 struct ceph_client *cl = fsc->client;
2340 struct ceph_osd_client *osdc = &fsc->client->osdc;
2341 struct ceph_cap_flush *prealloc_cf;
2342 ssize_t count, written = 0;
2343 int err, want = 0, got;
2344 bool direct_lock = false;
2345 u32 map_flags;
2346 u64 pool_flags;
2347 loff_t pos;
2348 loff_t limit = max(i_size_read(inode), fsc->max_file_size);
2349
2350 if (ceph_inode_is_shutdown(inode))
2351 return -ESTALE;
2352
2353 if (ceph_snap(inode) != CEPH_NOSNAP)
2354 return -EROFS;
2355
2356 prealloc_cf = ceph_alloc_cap_flush();
2357 if (!prealloc_cf)
2358 return -ENOMEM;
2359
2360 if ((iocb->ki_flags & (IOCB_DIRECT | IOCB_APPEND)) == IOCB_DIRECT)
2361 direct_lock = true;
2362
2363retry_snap:
2364 if (direct_lock)
2365 ceph_start_io_direct(inode);
2366 else
2367 ceph_start_io_write(inode);
2368
2369 if (iocb->ki_flags & IOCB_APPEND) {
2370 err = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false);
2371 if (err < 0)
2372 goto out;
2373 }
2374
2375 err = generic_write_checks(iocb, from);
2376 if (err <= 0)
2377 goto out;
2378
2379 pos = iocb->ki_pos;
2380 if (unlikely(pos >= limit)) {
2381 err = -EFBIG;
2382 goto out;
2383 } else {
2384 iov_iter_truncate(from, limit - pos);
2385 }
2386
2387 count = iov_iter_count(from);
2388 if (ceph_quota_is_max_bytes_exceeded(inode, pos + count)) {
2389 err = -EDQUOT;
2390 goto out;
2391 }
2392
2393 down_read(&osdc->lock);
2394 map_flags = osdc->osdmap->flags;
2395 pool_flags = ceph_pg_pool_flags(osdc->osdmap, ci->i_layout.pool_id);
2396 up_read(&osdc->lock);
2397 if ((map_flags & CEPH_OSDMAP_FULL) ||
2398 (pool_flags & CEPH_POOL_FLAG_FULL)) {
2399 err = -ENOSPC;
2400 goto out;
2401 }
2402
2403 err = file_remove_privs(file);
2404 if (err)
2405 goto out;
2406
2407 doutc(cl, "%p %llx.%llx %llu~%zd getting caps. i_size %llu\n",
2408 inode, ceph_vinop(inode), pos, count,
2409 i_size_read(inode));
2410 if (!(fi->flags & CEPH_F_SYNC) && !direct_lock)
2411 want |= CEPH_CAP_FILE_BUFFER;
2412 if (fi->fmode & CEPH_FILE_MODE_LAZY)
2413 want |= CEPH_CAP_FILE_LAZYIO;
2414 got = 0;
2415 err = ceph_get_caps(file, CEPH_CAP_FILE_WR, want, pos + count, &got);
2416 if (err < 0)
2417 goto out;
2418
2419 err = file_update_time(file);
2420 if (err)
2421 goto out_caps;
2422
2423 inode_inc_iversion_raw(inode);
2424
2425 doutc(cl, "%p %llx.%llx %llu~%zd got cap refs on %s\n",
2426 inode, ceph_vinop(inode), pos, count, ceph_cap_string(got));
2427
2428 if ((got & (CEPH_CAP_FILE_BUFFER|CEPH_CAP_FILE_LAZYIO)) == 0 ||
2429 (iocb->ki_flags & IOCB_DIRECT) || (fi->flags & CEPH_F_SYNC) ||
2430 (ci->i_ceph_flags & CEPH_I_ERROR_WRITE)) {
2431 struct ceph_snap_context *snapc;
2432 struct iov_iter data;
2433
2434 spin_lock(&ci->i_ceph_lock);
2435 if (__ceph_have_pending_cap_snap(ci)) {
2436 struct ceph_cap_snap *capsnap =
2437 list_last_entry(&ci->i_cap_snaps,
2438 struct ceph_cap_snap,
2439 ci_item);
2440 snapc = ceph_get_snap_context(capsnap->context);
2441 } else {
2442 BUG_ON(!ci->i_head_snapc);
2443 snapc = ceph_get_snap_context(ci->i_head_snapc);
2444 }
2445 spin_unlock(&ci->i_ceph_lock);
2446
2447 /* we might need to revert back to that point */
2448 data = *from;
2449 if ((iocb->ki_flags & IOCB_DIRECT) && !IS_ENCRYPTED(inode))
2450 written = ceph_direct_read_write(iocb, &data, snapc,
2451 &prealloc_cf);
2452 else
2453 written = ceph_sync_write(iocb, &data, pos, snapc);
2454 if (direct_lock)
2455 ceph_end_io_direct(inode);
2456 else
2457 ceph_end_io_write(inode);
2458 if (written > 0)
2459 iov_iter_advance(from, written);
2460 ceph_put_snap_context(snapc);
2461 } else {
2462 /*
2463 * No need to acquire the i_truncate_mutex. Because
2464 * the MDS revokes Fwb caps before sending truncate
2465 * message to us. We can't get Fwb cap while there
2466 * are pending vmtruncate. So write and vmtruncate
2467 * can not run at the same time
2468 */
2469 written = generic_perform_write(iocb, from);
2470 ceph_end_io_write(inode);
2471 }
2472
2473 if (written >= 0) {
2474 int dirty;
2475
2476 spin_lock(&ci->i_ceph_lock);
2477 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
2478 &prealloc_cf);
2479 spin_unlock(&ci->i_ceph_lock);
2480 if (dirty)
2481 __mark_inode_dirty(inode, dirty);
2482 if (ceph_quota_is_max_bytes_approaching(inode, iocb->ki_pos))
2483 ceph_check_caps(ci, CHECK_CAPS_FLUSH);
2484 }
2485
2486 doutc(cl, "%p %llx.%llx %llu~%u dropping cap refs on %s\n",
2487 inode, ceph_vinop(inode), pos, (unsigned)count,
2488 ceph_cap_string(got));
2489 ceph_put_cap_refs(ci, got);
2490
2491 if (written == -EOLDSNAPC) {
2492 doutc(cl, "%p %llx.%llx %llu~%u" "got EOLDSNAPC, retrying\n",
2493 inode, ceph_vinop(inode), pos, (unsigned)count);
2494 goto retry_snap;
2495 }
2496
2497 if (written >= 0) {
2498 if ((map_flags & CEPH_OSDMAP_NEARFULL) ||
2499 (pool_flags & CEPH_POOL_FLAG_NEARFULL))
2500 iocb->ki_flags |= IOCB_DSYNC;
2501 written = generic_write_sync(iocb, written);
2502 }
2503
2504 goto out_unlocked;
2505out_caps:
2506 ceph_put_cap_refs(ci, got);
2507out:
2508 if (direct_lock)
2509 ceph_end_io_direct(inode);
2510 else
2511 ceph_end_io_write(inode);
2512out_unlocked:
2513 ceph_free_cap_flush(prealloc_cf);
2514 return written ? written : err;
2515}
2516
2517/*
2518 * llseek. be sure to verify file size on SEEK_END.
2519 */
2520static loff_t ceph_llseek(struct file *file, loff_t offset, int whence)
2521{
2522 if (whence == SEEK_END || whence == SEEK_DATA || whence == SEEK_HOLE) {
2523 struct inode *inode = file_inode(file);
2524 int ret;
2525
2526 ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false);
2527 if (ret < 0)
2528 return ret;
2529 }
2530 return generic_file_llseek(file, offset, whence);
2531}
2532
2533static inline void ceph_zero_partial_page(
2534 struct inode *inode, loff_t offset, unsigned size)
2535{
2536 struct page *page;
2537 pgoff_t index = offset >> PAGE_SHIFT;
2538
2539 page = find_lock_page(inode->i_mapping, index);
2540 if (page) {
2541 wait_on_page_writeback(page);
2542 zero_user(page, offset & (PAGE_SIZE - 1), size);
2543 unlock_page(page);
2544 put_page(page);
2545 }
2546}
2547
2548static void ceph_zero_pagecache_range(struct inode *inode, loff_t offset,
2549 loff_t length)
2550{
2551 loff_t nearly = round_up(offset, PAGE_SIZE);
2552 if (offset < nearly) {
2553 loff_t size = nearly - offset;
2554 if (length < size)
2555 size = length;
2556 ceph_zero_partial_page(inode, offset, size);
2557 offset += size;
2558 length -= size;
2559 }
2560 if (length >= PAGE_SIZE) {
2561 loff_t size = round_down(length, PAGE_SIZE);
2562 truncate_pagecache_range(inode, offset, offset + size - 1);
2563 offset += size;
2564 length -= size;
2565 }
2566 if (length)
2567 ceph_zero_partial_page(inode, offset, length);
2568}
2569
2570static int ceph_zero_partial_object(struct inode *inode,
2571 loff_t offset, loff_t *length)
2572{
2573 struct ceph_inode_info *ci = ceph_inode(inode);
2574 struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode);
2575 struct ceph_osd_request *req;
2576 int ret = 0;
2577 loff_t zero = 0;
2578 int op;
2579
2580 if (ceph_inode_is_shutdown(inode))
2581 return -EIO;
2582
2583 if (!length) {
2584 op = offset ? CEPH_OSD_OP_DELETE : CEPH_OSD_OP_TRUNCATE;
2585 length = &zero;
2586 } else {
2587 op = CEPH_OSD_OP_ZERO;
2588 }
2589
2590 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
2591 ceph_vino(inode),
2592 offset, length,
2593 0, 1, op,
2594 CEPH_OSD_FLAG_WRITE,
2595 NULL, 0, 0, false);
2596 if (IS_ERR(req)) {
2597 ret = PTR_ERR(req);
2598 goto out;
2599 }
2600
2601 req->r_mtime = inode_get_mtime(inode);
2602 ceph_osdc_start_request(&fsc->client->osdc, req);
2603 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
2604 if (ret == -ENOENT)
2605 ret = 0;
2606 ceph_osdc_put_request(req);
2607
2608out:
2609 return ret;
2610}
2611
2612static int ceph_zero_objects(struct inode *inode, loff_t offset, loff_t length)
2613{
2614 int ret = 0;
2615 struct ceph_inode_info *ci = ceph_inode(inode);
2616 s32 stripe_unit = ci->i_layout.stripe_unit;
2617 s32 stripe_count = ci->i_layout.stripe_count;
2618 s32 object_size = ci->i_layout.object_size;
2619 u64 object_set_size = object_size * stripe_count;
2620 u64 nearly, t;
2621
2622 /* round offset up to next period boundary */
2623 nearly = offset + object_set_size - 1;
2624 t = nearly;
2625 nearly -= do_div(t, object_set_size);
2626
2627 while (length && offset < nearly) {
2628 loff_t size = length;
2629 ret = ceph_zero_partial_object(inode, offset, &size);
2630 if (ret < 0)
2631 return ret;
2632 offset += size;
2633 length -= size;
2634 }
2635 while (length >= object_set_size) {
2636 int i;
2637 loff_t pos = offset;
2638 for (i = 0; i < stripe_count; ++i) {
2639 ret = ceph_zero_partial_object(inode, pos, NULL);
2640 if (ret < 0)
2641 return ret;
2642 pos += stripe_unit;
2643 }
2644 offset += object_set_size;
2645 length -= object_set_size;
2646 }
2647 while (length) {
2648 loff_t size = length;
2649 ret = ceph_zero_partial_object(inode, offset, &size);
2650 if (ret < 0)
2651 return ret;
2652 offset += size;
2653 length -= size;
2654 }
2655 return ret;
2656}
2657
2658static long ceph_fallocate(struct file *file, int mode,
2659 loff_t offset, loff_t length)
2660{
2661 struct ceph_file_info *fi = file->private_data;
2662 struct inode *inode = file_inode(file);
2663 struct ceph_inode_info *ci = ceph_inode(inode);
2664 struct ceph_cap_flush *prealloc_cf;
2665 struct ceph_client *cl = ceph_inode_to_client(inode);
2666 int want, got = 0;
2667 int dirty;
2668 int ret = 0;
2669 loff_t endoff = 0;
2670 loff_t size;
2671
2672 doutc(cl, "%p %llx.%llx mode %x, offset %llu length %llu\n",
2673 inode, ceph_vinop(inode), mode, offset, length);
2674
2675 if (mode != (FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
2676 return -EOPNOTSUPP;
2677
2678 if (!S_ISREG(inode->i_mode))
2679 return -EOPNOTSUPP;
2680
2681 if (IS_ENCRYPTED(inode))
2682 return -EOPNOTSUPP;
2683
2684 prealloc_cf = ceph_alloc_cap_flush();
2685 if (!prealloc_cf)
2686 return -ENOMEM;
2687
2688 inode_lock(inode);
2689
2690 if (ceph_snap(inode) != CEPH_NOSNAP) {
2691 ret = -EROFS;
2692 goto unlock;
2693 }
2694
2695 size = i_size_read(inode);
2696
2697 /* Are we punching a hole beyond EOF? */
2698 if (offset >= size)
2699 goto unlock;
2700 if ((offset + length) > size)
2701 length = size - offset;
2702
2703 if (fi->fmode & CEPH_FILE_MODE_LAZY)
2704 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
2705 else
2706 want = CEPH_CAP_FILE_BUFFER;
2707
2708 ret = ceph_get_caps(file, CEPH_CAP_FILE_WR, want, endoff, &got);
2709 if (ret < 0)
2710 goto unlock;
2711
2712 ret = file_modified(file);
2713 if (ret)
2714 goto put_caps;
2715
2716 filemap_invalidate_lock(inode->i_mapping);
2717 ceph_fscache_invalidate(inode, false);
2718 ceph_zero_pagecache_range(inode, offset, length);
2719 ret = ceph_zero_objects(inode, offset, length);
2720
2721 if (!ret) {
2722 spin_lock(&ci->i_ceph_lock);
2723 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
2724 &prealloc_cf);
2725 spin_unlock(&ci->i_ceph_lock);
2726 if (dirty)
2727 __mark_inode_dirty(inode, dirty);
2728 }
2729 filemap_invalidate_unlock(inode->i_mapping);
2730
2731put_caps:
2732 ceph_put_cap_refs(ci, got);
2733unlock:
2734 inode_unlock(inode);
2735 ceph_free_cap_flush(prealloc_cf);
2736 return ret;
2737}
2738
2739/*
2740 * This function tries to get FILE_WR capabilities for dst_ci and FILE_RD for
2741 * src_ci. Two attempts are made to obtain both caps, and an error is return if
2742 * this fails; zero is returned on success.
2743 */
2744static int get_rd_wr_caps(struct file *src_filp, int *src_got,
2745 struct file *dst_filp,
2746 loff_t dst_endoff, int *dst_got)
2747{
2748 int ret = 0;
2749 bool retrying = false;
2750
2751retry_caps:
2752 ret = ceph_get_caps(dst_filp, CEPH_CAP_FILE_WR, CEPH_CAP_FILE_BUFFER,
2753 dst_endoff, dst_got);
2754 if (ret < 0)
2755 return ret;
2756
2757 /*
2758 * Since we're already holding the FILE_WR capability for the dst file,
2759 * we would risk a deadlock by using ceph_get_caps. Thus, we'll do some
2760 * retry dance instead to try to get both capabilities.
2761 */
2762 ret = ceph_try_get_caps(file_inode(src_filp),
2763 CEPH_CAP_FILE_RD, CEPH_CAP_FILE_SHARED,
2764 false, src_got);
2765 if (ret <= 0) {
2766 /* Start by dropping dst_ci caps and getting src_ci caps */
2767 ceph_put_cap_refs(ceph_inode(file_inode(dst_filp)), *dst_got);
2768 if (retrying) {
2769 if (!ret)
2770 /* ceph_try_get_caps masks EAGAIN */
2771 ret = -EAGAIN;
2772 return ret;
2773 }
2774 ret = ceph_get_caps(src_filp, CEPH_CAP_FILE_RD,
2775 CEPH_CAP_FILE_SHARED, -1, src_got);
2776 if (ret < 0)
2777 return ret;
2778 /*... drop src_ci caps too, and retry */
2779 ceph_put_cap_refs(ceph_inode(file_inode(src_filp)), *src_got);
2780 retrying = true;
2781 goto retry_caps;
2782 }
2783 return ret;
2784}
2785
2786static void put_rd_wr_caps(struct ceph_inode_info *src_ci, int src_got,
2787 struct ceph_inode_info *dst_ci, int dst_got)
2788{
2789 ceph_put_cap_refs(src_ci, src_got);
2790 ceph_put_cap_refs(dst_ci, dst_got);
2791}
2792
2793/*
2794 * This function does several size-related checks, returning an error if:
2795 * - source file is smaller than off+len
2796 * - destination file size is not OK (inode_newsize_ok())
2797 * - max bytes quotas is exceeded
2798 */
2799static int is_file_size_ok(struct inode *src_inode, struct inode *dst_inode,
2800 loff_t src_off, loff_t dst_off, size_t len)
2801{
2802 struct ceph_client *cl = ceph_inode_to_client(src_inode);
2803 loff_t size, endoff;
2804
2805 size = i_size_read(src_inode);
2806 /*
2807 * Don't copy beyond source file EOF. Instead of simply setting length
2808 * to (size - src_off), just drop to VFS default implementation, as the
2809 * local i_size may be stale due to other clients writing to the source
2810 * inode.
2811 */
2812 if (src_off + len > size) {
2813 doutc(cl, "Copy beyond EOF (%llu + %zu > %llu)\n", src_off,
2814 len, size);
2815 return -EOPNOTSUPP;
2816 }
2817 size = i_size_read(dst_inode);
2818
2819 endoff = dst_off + len;
2820 if (inode_newsize_ok(dst_inode, endoff))
2821 return -EOPNOTSUPP;
2822
2823 if (ceph_quota_is_max_bytes_exceeded(dst_inode, endoff))
2824 return -EDQUOT;
2825
2826 return 0;
2827}
2828
2829static struct ceph_osd_request *
2830ceph_alloc_copyfrom_request(struct ceph_osd_client *osdc,
2831 u64 src_snapid,
2832 struct ceph_object_id *src_oid,
2833 struct ceph_object_locator *src_oloc,
2834 struct ceph_object_id *dst_oid,
2835 struct ceph_object_locator *dst_oloc,
2836 u32 truncate_seq, u64 truncate_size)
2837{
2838 struct ceph_osd_request *req;
2839 int ret;
2840 u32 src_fadvise_flags =
2841 CEPH_OSD_OP_FLAG_FADVISE_SEQUENTIAL |
2842 CEPH_OSD_OP_FLAG_FADVISE_NOCACHE;
2843 u32 dst_fadvise_flags =
2844 CEPH_OSD_OP_FLAG_FADVISE_SEQUENTIAL |
2845 CEPH_OSD_OP_FLAG_FADVISE_DONTNEED;
2846
2847 req = ceph_osdc_alloc_request(osdc, NULL, 1, false, GFP_KERNEL);
2848 if (!req)
2849 return ERR_PTR(-ENOMEM);
2850
2851 req->r_flags = CEPH_OSD_FLAG_WRITE;
2852
2853 ceph_oloc_copy(&req->r_t.base_oloc, dst_oloc);
2854 ceph_oid_copy(&req->r_t.base_oid, dst_oid);
2855
2856 ret = osd_req_op_copy_from_init(req, src_snapid, 0,
2857 src_oid, src_oloc,
2858 src_fadvise_flags,
2859 dst_fadvise_flags,
2860 truncate_seq,
2861 truncate_size,
2862 CEPH_OSD_COPY_FROM_FLAG_TRUNCATE_SEQ);
2863 if (ret)
2864 goto out;
2865
2866 ret = ceph_osdc_alloc_messages(req, GFP_KERNEL);
2867 if (ret)
2868 goto out;
2869
2870 return req;
2871
2872out:
2873 ceph_osdc_put_request(req);
2874 return ERR_PTR(ret);
2875}
2876
2877static ssize_t ceph_do_objects_copy(struct ceph_inode_info *src_ci, u64 *src_off,
2878 struct ceph_inode_info *dst_ci, u64 *dst_off,
2879 struct ceph_fs_client *fsc,
2880 size_t len, unsigned int flags)
2881{
2882 struct ceph_object_locator src_oloc, dst_oloc;
2883 struct ceph_object_id src_oid, dst_oid;
2884 struct ceph_osd_client *osdc;
2885 struct ceph_osd_request *req;
2886 size_t bytes = 0;
2887 u64 src_objnum, src_objoff, dst_objnum, dst_objoff;
2888 u32 src_objlen, dst_objlen;
2889 u32 object_size = src_ci->i_layout.object_size;
2890 struct ceph_client *cl = fsc->client;
2891 int ret;
2892
2893 src_oloc.pool = src_ci->i_layout.pool_id;
2894 src_oloc.pool_ns = ceph_try_get_string(src_ci->i_layout.pool_ns);
2895 dst_oloc.pool = dst_ci->i_layout.pool_id;
2896 dst_oloc.pool_ns = ceph_try_get_string(dst_ci->i_layout.pool_ns);
2897 osdc = &fsc->client->osdc;
2898
2899 while (len >= object_size) {
2900 ceph_calc_file_object_mapping(&src_ci->i_layout, *src_off,
2901 object_size, &src_objnum,
2902 &src_objoff, &src_objlen);
2903 ceph_calc_file_object_mapping(&dst_ci->i_layout, *dst_off,
2904 object_size, &dst_objnum,
2905 &dst_objoff, &dst_objlen);
2906 ceph_oid_init(&src_oid);
2907 ceph_oid_printf(&src_oid, "%llx.%08llx",
2908 src_ci->i_vino.ino, src_objnum);
2909 ceph_oid_init(&dst_oid);
2910 ceph_oid_printf(&dst_oid, "%llx.%08llx",
2911 dst_ci->i_vino.ino, dst_objnum);
2912 /* Do an object remote copy */
2913 req = ceph_alloc_copyfrom_request(osdc, src_ci->i_vino.snap,
2914 &src_oid, &src_oloc,
2915 &dst_oid, &dst_oloc,
2916 dst_ci->i_truncate_seq,
2917 dst_ci->i_truncate_size);
2918 if (IS_ERR(req))
2919 ret = PTR_ERR(req);
2920 else {
2921 ceph_osdc_start_request(osdc, req);
2922 ret = ceph_osdc_wait_request(osdc, req);
2923 ceph_update_copyfrom_metrics(&fsc->mdsc->metric,
2924 req->r_start_latency,
2925 req->r_end_latency,
2926 object_size, ret);
2927 ceph_osdc_put_request(req);
2928 }
2929 if (ret) {
2930 if (ret == -EOPNOTSUPP) {
2931 fsc->have_copy_from2 = false;
2932 pr_notice_client(cl,
2933 "OSDs don't support copy-from2; disabling copy offload\n");
2934 }
2935 doutc(cl, "returned %d\n", ret);
2936 if (!bytes)
2937 bytes = ret;
2938 goto out;
2939 }
2940 len -= object_size;
2941 bytes += object_size;
2942 *src_off += object_size;
2943 *dst_off += object_size;
2944 }
2945
2946out:
2947 ceph_oloc_destroy(&src_oloc);
2948 ceph_oloc_destroy(&dst_oloc);
2949 return bytes;
2950}
2951
2952static ssize_t __ceph_copy_file_range(struct file *src_file, loff_t src_off,
2953 struct file *dst_file, loff_t dst_off,
2954 size_t len, unsigned int flags)
2955{
2956 struct inode *src_inode = file_inode(src_file);
2957 struct inode *dst_inode = file_inode(dst_file);
2958 struct ceph_inode_info *src_ci = ceph_inode(src_inode);
2959 struct ceph_inode_info *dst_ci = ceph_inode(dst_inode);
2960 struct ceph_cap_flush *prealloc_cf;
2961 struct ceph_fs_client *src_fsc = ceph_inode_to_fs_client(src_inode);
2962 struct ceph_client *cl = src_fsc->client;
2963 loff_t size;
2964 ssize_t ret = -EIO, bytes;
2965 u64 src_objnum, dst_objnum, src_objoff, dst_objoff;
2966 u32 src_objlen, dst_objlen;
2967 int src_got = 0, dst_got = 0, err, dirty;
2968
2969 if (src_inode->i_sb != dst_inode->i_sb) {
2970 struct ceph_fs_client *dst_fsc = ceph_inode_to_fs_client(dst_inode);
2971
2972 if (ceph_fsid_compare(&src_fsc->client->fsid,
2973 &dst_fsc->client->fsid)) {
2974 dout("Copying files across clusters: src: %pU dst: %pU\n",
2975 &src_fsc->client->fsid, &dst_fsc->client->fsid);
2976 return -EXDEV;
2977 }
2978 }
2979 if (ceph_snap(dst_inode) != CEPH_NOSNAP)
2980 return -EROFS;
2981
2982 /*
2983 * Some of the checks below will return -EOPNOTSUPP, which will force a
2984 * fallback to the default VFS copy_file_range implementation. This is
2985 * desirable in several cases (for ex, the 'len' is smaller than the
2986 * size of the objects, or in cases where that would be more
2987 * efficient).
2988 */
2989
2990 if (ceph_test_mount_opt(src_fsc, NOCOPYFROM))
2991 return -EOPNOTSUPP;
2992
2993 if (!src_fsc->have_copy_from2)
2994 return -EOPNOTSUPP;
2995
2996 /*
2997 * Striped file layouts require that we copy partial objects, but the
2998 * OSD copy-from operation only supports full-object copies. Limit
2999 * this to non-striped file layouts for now.
3000 */
3001 if ((src_ci->i_layout.stripe_unit != dst_ci->i_layout.stripe_unit) ||
3002 (src_ci->i_layout.stripe_count != 1) ||
3003 (dst_ci->i_layout.stripe_count != 1) ||
3004 (src_ci->i_layout.object_size != dst_ci->i_layout.object_size)) {
3005 doutc(cl, "Invalid src/dst files layout\n");
3006 return -EOPNOTSUPP;
3007 }
3008
3009 /* Every encrypted inode gets its own key, so we can't offload them */
3010 if (IS_ENCRYPTED(src_inode) || IS_ENCRYPTED(dst_inode))
3011 return -EOPNOTSUPP;
3012
3013 if (len < src_ci->i_layout.object_size)
3014 return -EOPNOTSUPP; /* no remote copy will be done */
3015
3016 prealloc_cf = ceph_alloc_cap_flush();
3017 if (!prealloc_cf)
3018 return -ENOMEM;
3019
3020 /* Start by sync'ing the source and destination files */
3021 ret = file_write_and_wait_range(src_file, src_off, (src_off + len));
3022 if (ret < 0) {
3023 doutc(cl, "failed to write src file (%zd)\n", ret);
3024 goto out;
3025 }
3026 ret = file_write_and_wait_range(dst_file, dst_off, (dst_off + len));
3027 if (ret < 0) {
3028 doutc(cl, "failed to write dst file (%zd)\n", ret);
3029 goto out;
3030 }
3031
3032 /*
3033 * We need FILE_WR caps for dst_ci and FILE_RD for src_ci as other
3034 * clients may have dirty data in their caches. And OSDs know nothing
3035 * about caps, so they can't safely do the remote object copies.
3036 */
3037 err = get_rd_wr_caps(src_file, &src_got,
3038 dst_file, (dst_off + len), &dst_got);
3039 if (err < 0) {
3040 doutc(cl, "get_rd_wr_caps returned %d\n", err);
3041 ret = -EOPNOTSUPP;
3042 goto out;
3043 }
3044
3045 ret = is_file_size_ok(src_inode, dst_inode, src_off, dst_off, len);
3046 if (ret < 0)
3047 goto out_caps;
3048
3049 /* Drop dst file cached pages */
3050 ceph_fscache_invalidate(dst_inode, false);
3051 ret = invalidate_inode_pages2_range(dst_inode->i_mapping,
3052 dst_off >> PAGE_SHIFT,
3053 (dst_off + len) >> PAGE_SHIFT);
3054 if (ret < 0) {
3055 doutc(cl, "Failed to invalidate inode pages (%zd)\n",
3056 ret);
3057 ret = 0; /* XXX */
3058 }
3059 ceph_calc_file_object_mapping(&src_ci->i_layout, src_off,
3060 src_ci->i_layout.object_size,
3061 &src_objnum, &src_objoff, &src_objlen);
3062 ceph_calc_file_object_mapping(&dst_ci->i_layout, dst_off,
3063 dst_ci->i_layout.object_size,
3064 &dst_objnum, &dst_objoff, &dst_objlen);
3065 /* object-level offsets need to the same */
3066 if (src_objoff != dst_objoff) {
3067 ret = -EOPNOTSUPP;
3068 goto out_caps;
3069 }
3070
3071 /*
3072 * Do a manual copy if the object offset isn't object aligned.
3073 * 'src_objlen' contains the bytes left until the end of the object,
3074 * starting at the src_off
3075 */
3076 if (src_objoff) {
3077 doutc(cl, "Initial partial copy of %u bytes\n", src_objlen);
3078
3079 /*
3080 * we need to temporarily drop all caps as we'll be calling
3081 * {read,write}_iter, which will get caps again.
3082 */
3083 put_rd_wr_caps(src_ci, src_got, dst_ci, dst_got);
3084 ret = splice_file_range(src_file, &src_off, dst_file, &dst_off,
3085 src_objlen);
3086 /* Abort on short copies or on error */
3087 if (ret < (long)src_objlen) {
3088 doutc(cl, "Failed partial copy (%zd)\n", ret);
3089 goto out;
3090 }
3091 len -= ret;
3092 err = get_rd_wr_caps(src_file, &src_got,
3093 dst_file, (dst_off + len), &dst_got);
3094 if (err < 0)
3095 goto out;
3096 err = is_file_size_ok(src_inode, dst_inode,
3097 src_off, dst_off, len);
3098 if (err < 0)
3099 goto out_caps;
3100 }
3101
3102 size = i_size_read(dst_inode);
3103 bytes = ceph_do_objects_copy(src_ci, &src_off, dst_ci, &dst_off,
3104 src_fsc, len, flags);
3105 if (bytes <= 0) {
3106 if (!ret)
3107 ret = bytes;
3108 goto out_caps;
3109 }
3110 doutc(cl, "Copied %zu bytes out of %zu\n", bytes, len);
3111 len -= bytes;
3112 ret += bytes;
3113
3114 file_update_time(dst_file);
3115 inode_inc_iversion_raw(dst_inode);
3116
3117 if (dst_off > size) {
3118 /* Let the MDS know about dst file size change */
3119 if (ceph_inode_set_size(dst_inode, dst_off) ||
3120 ceph_quota_is_max_bytes_approaching(dst_inode, dst_off))
3121 ceph_check_caps(dst_ci, CHECK_CAPS_AUTHONLY | CHECK_CAPS_FLUSH);
3122 }
3123 /* Mark Fw dirty */
3124 spin_lock(&dst_ci->i_ceph_lock);
3125 dirty = __ceph_mark_dirty_caps(dst_ci, CEPH_CAP_FILE_WR, &prealloc_cf);
3126 spin_unlock(&dst_ci->i_ceph_lock);
3127 if (dirty)
3128 __mark_inode_dirty(dst_inode, dirty);
3129
3130out_caps:
3131 put_rd_wr_caps(src_ci, src_got, dst_ci, dst_got);
3132
3133 /*
3134 * Do the final manual copy if we still have some bytes left, unless
3135 * there were errors in remote object copies (len >= object_size).
3136 */
3137 if (len && (len < src_ci->i_layout.object_size)) {
3138 doutc(cl, "Final partial copy of %zu bytes\n", len);
3139 bytes = splice_file_range(src_file, &src_off, dst_file,
3140 &dst_off, len);
3141 if (bytes > 0)
3142 ret += bytes;
3143 else
3144 doutc(cl, "Failed partial copy (%zd)\n", bytes);
3145 }
3146
3147out:
3148 ceph_free_cap_flush(prealloc_cf);
3149
3150 return ret;
3151}
3152
3153static ssize_t ceph_copy_file_range(struct file *src_file, loff_t src_off,
3154 struct file *dst_file, loff_t dst_off,
3155 size_t len, unsigned int flags)
3156{
3157 ssize_t ret;
3158
3159 ret = __ceph_copy_file_range(src_file, src_off, dst_file, dst_off,
3160 len, flags);
3161
3162 if (ret == -EOPNOTSUPP || ret == -EXDEV)
3163 ret = splice_copy_file_range(src_file, src_off, dst_file,
3164 dst_off, len);
3165 return ret;
3166}
3167
3168const struct file_operations ceph_file_fops = {
3169 .open = ceph_open,
3170 .release = ceph_release,
3171 .llseek = ceph_llseek,
3172 .read_iter = ceph_read_iter,
3173 .write_iter = ceph_write_iter,
3174 .mmap = ceph_mmap,
3175 .fsync = ceph_fsync,
3176 .lock = ceph_lock,
3177 .setlease = simple_nosetlease,
3178 .flock = ceph_flock,
3179 .splice_read = ceph_splice_read,
3180 .splice_write = iter_file_splice_write,
3181 .unlocked_ioctl = ceph_ioctl,
3182 .compat_ioctl = compat_ptr_ioctl,
3183 .fallocate = ceph_fallocate,
3184 .copy_file_range = ceph_copy_file_range,
3185};