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