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