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