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1 #include <linux/ceph/ceph_debug.h>
2
3 #include <linux/module.h>
4 #include <linux/sched.h>
5 #include <linux/slab.h>
6 #include <linux/file.h>
7 #include <linux/mount.h>
8 #include <linux/namei.h>
9 #include <linux/writeback.h>
10 #include <linux/falloc.h>
11
12 #include "super.h"
13 #include "mds_client.h"
14 #include "cache.h"
15
16 static __le32 ceph_flags_sys2wire(u32 flags)
17 {
18 u32 wire_flags = 0;
19
20 switch (flags & O_ACCMODE) {
21 case O_RDONLY:
22 wire_flags |= CEPH_O_RDONLY;
23 break;
24 case O_WRONLY:
25 wire_flags |= CEPH_O_WRONLY;
26 break;
27 case O_RDWR:
28 wire_flags |= CEPH_O_RDWR;
29 break;
30 }
31
32 #define ceph_sys2wire(a) if (flags & a) { wire_flags |= CEPH_##a; flags &= ~a; }
33
34 ceph_sys2wire(O_CREAT);
35 ceph_sys2wire(O_EXCL);
36 ceph_sys2wire(O_TRUNC);
37 ceph_sys2wire(O_DIRECTORY);
38 ceph_sys2wire(O_NOFOLLOW);
39
40 #undef ceph_sys2wire
41
42 if (flags)
43 dout("unused open flags: %x", flags);
44
45 return cpu_to_le32(wire_flags);
46 }
47
48 /*
49 * Ceph file operations
50 *
51 * Implement basic open/close functionality, and implement
52 * read/write.
53 *
54 * We implement three modes of file I/O:
55 * - buffered uses the generic_file_aio_{read,write} helpers
56 *
57 * - synchronous is used when there is multi-client read/write
58 * sharing, avoids the page cache, and synchronously waits for an
59 * ack from the OSD.
60 *
61 * - direct io takes the variant of the sync path that references
62 * user pages directly.
63 *
64 * fsync() flushes and waits on dirty pages, but just queues metadata
65 * for writeback: since the MDS can recover size and mtime there is no
66 * need to wait for MDS acknowledgement.
67 */
68
69 /*
70 * Calculate the length sum of direct io vectors that can
71 * be combined into one page vector.
72 */
73 static size_t dio_get_pagev_size(const struct iov_iter *it)
74 {
75 const struct iovec *iov = it->iov;
76 const struct iovec *iovend = iov + it->nr_segs;
77 size_t size;
78
79 size = iov->iov_len - it->iov_offset;
80 /*
81 * An iov can be page vectored when both the current tail
82 * and the next base are page aligned.
83 */
84 while (PAGE_ALIGNED((iov->iov_base + iov->iov_len)) &&
85 (++iov < iovend && PAGE_ALIGNED((iov->iov_base)))) {
86 size += iov->iov_len;
87 }
88 dout("dio_get_pagevlen len = %zu\n", size);
89 return size;
90 }
91
92 /*
93 * Allocate a page vector based on (@it, @nbytes).
94 * The return value is the tuple describing a page vector,
95 * that is (@pages, @page_align, @num_pages).
96 */
97 static struct page **
98 dio_get_pages_alloc(const struct iov_iter *it, size_t nbytes,
99 size_t *page_align, int *num_pages)
100 {
101 struct iov_iter tmp_it = *it;
102 size_t align;
103 struct page **pages;
104 int ret = 0, idx, npages;
105
106 align = (unsigned long)(it->iov->iov_base + it->iov_offset) &
107 (PAGE_SIZE - 1);
108 npages = calc_pages_for(align, nbytes);
109 pages = kvmalloc(sizeof(*pages) * npages, GFP_KERNEL);
110 if (!pages)
111 return ERR_PTR(-ENOMEM);
112
113 for (idx = 0; idx < npages; ) {
114 size_t start;
115 ret = iov_iter_get_pages(&tmp_it, pages + idx, nbytes,
116 npages - idx, &start);
117 if (ret < 0)
118 goto fail;
119
120 iov_iter_advance(&tmp_it, ret);
121 nbytes -= ret;
122 idx += (ret + start + PAGE_SIZE - 1) / PAGE_SIZE;
123 }
124
125 BUG_ON(nbytes != 0);
126 *num_pages = npages;
127 *page_align = align;
128 dout("dio_get_pages_alloc: got %d pages align %zu\n", npages, align);
129 return pages;
130 fail:
131 ceph_put_page_vector(pages, idx, false);
132 return ERR_PTR(ret);
133 }
134
135 /*
136 * Prepare an open request. Preallocate ceph_cap to avoid an
137 * inopportune ENOMEM later.
138 */
139 static struct ceph_mds_request *
140 prepare_open_request(struct super_block *sb, int flags, int create_mode)
141 {
142 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
143 struct ceph_mds_client *mdsc = fsc->mdsc;
144 struct ceph_mds_request *req;
145 int want_auth = USE_ANY_MDS;
146 int op = (flags & O_CREAT) ? CEPH_MDS_OP_CREATE : CEPH_MDS_OP_OPEN;
147
148 if (flags & (O_WRONLY|O_RDWR|O_CREAT|O_TRUNC))
149 want_auth = USE_AUTH_MDS;
150
151 req = ceph_mdsc_create_request(mdsc, op, want_auth);
152 if (IS_ERR(req))
153 goto out;
154 req->r_fmode = ceph_flags_to_mode(flags);
155 req->r_args.open.flags = ceph_flags_sys2wire(flags);
156 req->r_args.open.mode = cpu_to_le32(create_mode);
157 out:
158 return req;
159 }
160
161 /*
162 * initialize private struct file data.
163 * if we fail, clean up by dropping fmode reference on the ceph_inode
164 */
165 static int ceph_init_file(struct inode *inode, struct file *file, int fmode)
166 {
167 struct ceph_file_info *cf;
168 int ret = 0;
169
170 switch (inode->i_mode & S_IFMT) {
171 case S_IFREG:
172 ceph_fscache_register_inode_cookie(inode);
173 ceph_fscache_file_set_cookie(inode, file);
174 case S_IFDIR:
175 dout("init_file %p %p 0%o (regular)\n", inode, file,
176 inode->i_mode);
177 cf = kmem_cache_zalloc(ceph_file_cachep, GFP_KERNEL);
178 if (cf == NULL) {
179 ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */
180 return -ENOMEM;
181 }
182 cf->fmode = fmode;
183 cf->next_offset = 2;
184 cf->readdir_cache_idx = -1;
185 file->private_data = cf;
186 BUG_ON(inode->i_fop->release != ceph_release);
187 break;
188
189 case S_IFLNK:
190 dout("init_file %p %p 0%o (symlink)\n", inode, file,
191 inode->i_mode);
192 ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */
193 break;
194
195 default:
196 dout("init_file %p %p 0%o (special)\n", inode, file,
197 inode->i_mode);
198 /*
199 * we need to drop the open ref now, since we don't
200 * have .release set to ceph_release.
201 */
202 ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */
203 BUG_ON(inode->i_fop->release == ceph_release);
204
205 /* call the proper open fop */
206 ret = inode->i_fop->open(inode, file);
207 }
208 return ret;
209 }
210
211 /*
212 * try renew caps after session gets killed.
213 */
214 int ceph_renew_caps(struct inode *inode)
215 {
216 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
217 struct ceph_inode_info *ci = ceph_inode(inode);
218 struct ceph_mds_request *req;
219 int err, flags, wanted;
220
221 spin_lock(&ci->i_ceph_lock);
222 wanted = __ceph_caps_file_wanted(ci);
223 if (__ceph_is_any_real_caps(ci) &&
224 (!(wanted & CEPH_CAP_ANY_WR) || ci->i_auth_cap)) {
225 int issued = __ceph_caps_issued(ci, NULL);
226 spin_unlock(&ci->i_ceph_lock);
227 dout("renew caps %p want %s issued %s updating mds_wanted\n",
228 inode, ceph_cap_string(wanted), ceph_cap_string(issued));
229 ceph_check_caps(ci, 0, NULL);
230 return 0;
231 }
232 spin_unlock(&ci->i_ceph_lock);
233
234 flags = 0;
235 if ((wanted & CEPH_CAP_FILE_RD) && (wanted & CEPH_CAP_FILE_WR))
236 flags = O_RDWR;
237 else if (wanted & CEPH_CAP_FILE_RD)
238 flags = O_RDONLY;
239 else if (wanted & CEPH_CAP_FILE_WR)
240 flags = O_WRONLY;
241 #ifdef O_LAZY
242 if (wanted & CEPH_CAP_FILE_LAZYIO)
243 flags |= O_LAZY;
244 #endif
245
246 req = prepare_open_request(inode->i_sb, flags, 0);
247 if (IS_ERR(req)) {
248 err = PTR_ERR(req);
249 goto out;
250 }
251
252 req->r_inode = inode;
253 ihold(inode);
254 req->r_num_caps = 1;
255 req->r_fmode = -1;
256
257 err = ceph_mdsc_do_request(mdsc, NULL, req);
258 ceph_mdsc_put_request(req);
259 out:
260 dout("renew caps %p open result=%d\n", inode, err);
261 return err < 0 ? err : 0;
262 }
263
264 /*
265 * If we already have the requisite capabilities, we can satisfy
266 * the open request locally (no need to request new caps from the
267 * MDS). We do, however, need to inform the MDS (asynchronously)
268 * if our wanted caps set expands.
269 */
270 int ceph_open(struct inode *inode, struct file *file)
271 {
272 struct ceph_inode_info *ci = ceph_inode(inode);
273 struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
274 struct ceph_mds_client *mdsc = fsc->mdsc;
275 struct ceph_mds_request *req;
276 struct ceph_file_info *cf = file->private_data;
277 int err;
278 int flags, fmode, wanted;
279
280 if (cf) {
281 dout("open file %p is already opened\n", file);
282 return 0;
283 }
284
285 /* filter out O_CREAT|O_EXCL; vfs did that already. yuck. */
286 flags = file->f_flags & ~(O_CREAT|O_EXCL);
287 if (S_ISDIR(inode->i_mode))
288 flags = O_DIRECTORY; /* mds likes to know */
289
290 dout("open inode %p ino %llx.%llx file %p flags %d (%d)\n", inode,
291 ceph_vinop(inode), file, flags, file->f_flags);
292 fmode = ceph_flags_to_mode(flags);
293 wanted = ceph_caps_for_mode(fmode);
294
295 /* snapped files are read-only */
296 if (ceph_snap(inode) != CEPH_NOSNAP && (file->f_mode & FMODE_WRITE))
297 return -EROFS;
298
299 /* trivially open snapdir */
300 if (ceph_snap(inode) == CEPH_SNAPDIR) {
301 spin_lock(&ci->i_ceph_lock);
302 __ceph_get_fmode(ci, fmode);
303 spin_unlock(&ci->i_ceph_lock);
304 return ceph_init_file(inode, file, fmode);
305 }
306
307 /*
308 * No need to block if we have caps on the auth MDS (for
309 * write) or any MDS (for read). Update wanted set
310 * asynchronously.
311 */
312 spin_lock(&ci->i_ceph_lock);
313 if (__ceph_is_any_real_caps(ci) &&
314 (((fmode & CEPH_FILE_MODE_WR) == 0) || ci->i_auth_cap)) {
315 int mds_wanted = __ceph_caps_mds_wanted(ci, true);
316 int issued = __ceph_caps_issued(ci, NULL);
317
318 dout("open %p fmode %d want %s issued %s using existing\n",
319 inode, fmode, ceph_cap_string(wanted),
320 ceph_cap_string(issued));
321 __ceph_get_fmode(ci, fmode);
322 spin_unlock(&ci->i_ceph_lock);
323
324 /* adjust wanted? */
325 if ((issued & wanted) != wanted &&
326 (mds_wanted & wanted) != wanted &&
327 ceph_snap(inode) != CEPH_SNAPDIR)
328 ceph_check_caps(ci, 0, NULL);
329
330 return ceph_init_file(inode, file, fmode);
331 } else if (ceph_snap(inode) != CEPH_NOSNAP &&
332 (ci->i_snap_caps & wanted) == wanted) {
333 __ceph_get_fmode(ci, fmode);
334 spin_unlock(&ci->i_ceph_lock);
335 return ceph_init_file(inode, file, fmode);
336 }
337
338 spin_unlock(&ci->i_ceph_lock);
339
340 dout("open fmode %d wants %s\n", fmode, ceph_cap_string(wanted));
341 req = prepare_open_request(inode->i_sb, flags, 0);
342 if (IS_ERR(req)) {
343 err = PTR_ERR(req);
344 goto out;
345 }
346 req->r_inode = inode;
347 ihold(inode);
348
349 req->r_num_caps = 1;
350 err = ceph_mdsc_do_request(mdsc, NULL, req);
351 if (!err)
352 err = ceph_init_file(inode, file, req->r_fmode);
353 ceph_mdsc_put_request(req);
354 dout("open result=%d on %llx.%llx\n", err, ceph_vinop(inode));
355 out:
356 return err;
357 }
358
359
360 /*
361 * Do a lookup + open with a single request. If we get a non-existent
362 * file or symlink, return 1 so the VFS can retry.
363 */
364 int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
365 struct file *file, unsigned flags, umode_t mode,
366 int *opened)
367 {
368 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
369 struct ceph_mds_client *mdsc = fsc->mdsc;
370 struct ceph_mds_request *req;
371 struct dentry *dn;
372 struct ceph_acls_info acls = {};
373 int mask;
374 int err;
375
376 dout("atomic_open %p dentry %p '%pd' %s flags %d mode 0%o\n",
377 dir, dentry, dentry,
378 d_unhashed(dentry) ? "unhashed" : "hashed", flags, mode);
379
380 if (dentry->d_name.len > NAME_MAX)
381 return -ENAMETOOLONG;
382
383 if (flags & O_CREAT) {
384 err = ceph_pre_init_acls(dir, &mode, &acls);
385 if (err < 0)
386 return err;
387 }
388
389 /* do the open */
390 req = prepare_open_request(dir->i_sb, flags, mode);
391 if (IS_ERR(req)) {
392 err = PTR_ERR(req);
393 goto out_acl;
394 }
395 req->r_dentry = dget(dentry);
396 req->r_num_caps = 2;
397 if (flags & O_CREAT) {
398 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
399 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
400 if (acls.pagelist) {
401 req->r_pagelist = acls.pagelist;
402 acls.pagelist = NULL;
403 }
404 }
405
406 mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED;
407 if (ceph_security_xattr_wanted(dir))
408 mask |= CEPH_CAP_XATTR_SHARED;
409 req->r_args.open.mask = cpu_to_le32(mask);
410
411 req->r_parent = dir;
412 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
413 err = ceph_mdsc_do_request(mdsc,
414 (flags & (O_CREAT|O_TRUNC)) ? dir : NULL,
415 req);
416 err = ceph_handle_snapdir(req, dentry, err);
417 if (err)
418 goto out_req;
419
420 if ((flags & O_CREAT) && !req->r_reply_info.head->is_dentry)
421 err = ceph_handle_notrace_create(dir, dentry);
422
423 if (d_in_lookup(dentry)) {
424 dn = ceph_finish_lookup(req, dentry, err);
425 if (IS_ERR(dn))
426 err = PTR_ERR(dn);
427 } else {
428 /* we were given a hashed negative dentry */
429 dn = NULL;
430 }
431 if (err)
432 goto out_req;
433 if (dn || d_really_is_negative(dentry) || d_is_symlink(dentry)) {
434 /* make vfs retry on splice, ENOENT, or symlink */
435 dout("atomic_open finish_no_open on dn %p\n", dn);
436 err = finish_no_open(file, dn);
437 } else {
438 dout("atomic_open finish_open on dn %p\n", dn);
439 if (req->r_op == CEPH_MDS_OP_CREATE && req->r_reply_info.has_create_ino) {
440 ceph_init_inode_acls(d_inode(dentry), &acls);
441 *opened |= FILE_CREATED;
442 }
443 err = finish_open(file, dentry, ceph_open, opened);
444 }
445 out_req:
446 if (!req->r_err && req->r_target_inode)
447 ceph_put_fmode(ceph_inode(req->r_target_inode), req->r_fmode);
448 ceph_mdsc_put_request(req);
449 out_acl:
450 ceph_release_acls_info(&acls);
451 dout("atomic_open result=%d\n", err);
452 return err;
453 }
454
455 int ceph_release(struct inode *inode, struct file *file)
456 {
457 struct ceph_inode_info *ci = ceph_inode(inode);
458 struct ceph_file_info *cf = file->private_data;
459
460 dout("release inode %p file %p\n", inode, file);
461 ceph_put_fmode(ci, cf->fmode);
462 if (cf->last_readdir)
463 ceph_mdsc_put_request(cf->last_readdir);
464 kfree(cf->last_name);
465 kfree(cf->dir_info);
466 kmem_cache_free(ceph_file_cachep, cf);
467
468 /* wake up anyone waiting for caps on this inode */
469 wake_up_all(&ci->i_cap_wq);
470 return 0;
471 }
472
473 enum {
474 HAVE_RETRIED = 1,
475 CHECK_EOF = 2,
476 READ_INLINE = 3,
477 };
478
479 /*
480 * Read a range of bytes striped over one or more objects. Iterate over
481 * objects we stripe over. (That's not atomic, but good enough for now.)
482 *
483 * If we get a short result from the OSD, check against i_size; we need to
484 * only return a short read to the caller if we hit EOF.
485 */
486 static int striped_read(struct inode *inode,
487 u64 pos, u64 len,
488 struct page **pages, int num_pages,
489 int page_align, int *checkeof)
490 {
491 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
492 struct ceph_inode_info *ci = ceph_inode(inode);
493 u64 this_len;
494 loff_t i_size;
495 int page_idx;
496 int ret, read = 0;
497 bool hit_stripe, was_short;
498
499 /*
500 * we may need to do multiple reads. not atomic, unfortunately.
501 */
502 more:
503 this_len = len;
504 page_idx = (page_align + read) >> PAGE_SHIFT;
505 ret = ceph_osdc_readpages(&fsc->client->osdc, ceph_vino(inode),
506 &ci->i_layout, pos, &this_len,
507 ci->i_truncate_seq, ci->i_truncate_size,
508 pages + page_idx, num_pages - page_idx,
509 ((page_align + read) & ~PAGE_MASK));
510 if (ret == -ENOENT)
511 ret = 0;
512 hit_stripe = this_len < len;
513 was_short = ret >= 0 && ret < this_len;
514 dout("striped_read %llu~%llu (read %u) got %d%s%s\n", pos, len, read,
515 ret, hit_stripe ? " HITSTRIPE" : "", was_short ? " SHORT" : "");
516
517 i_size = i_size_read(inode);
518 if (ret >= 0) {
519 if (was_short && (pos + ret < i_size)) {
520 int zlen = min(this_len - ret, i_size - pos - ret);
521 int zoff = page_align + read + ret;
522 dout(" zero gap %llu to %llu\n",
523 pos + ret, pos + ret + zlen);
524 ceph_zero_page_vector_range(zoff, zlen, pages);
525 ret += zlen;
526 }
527
528 read += ret;
529 pos += ret;
530 len -= ret;
531
532 /* hit stripe and need continue*/
533 if (len && hit_stripe && pos < i_size)
534 goto more;
535 }
536
537 if (read > 0) {
538 ret = read;
539 /* did we bounce off eof? */
540 if (pos + len > i_size)
541 *checkeof = CHECK_EOF;
542 }
543
544 dout("striped_read returns %d\n", ret);
545 return ret;
546 }
547
548 /*
549 * Completely synchronous read and write methods. Direct from __user
550 * buffer to osd, or directly to user pages (if O_DIRECT).
551 *
552 * If the read spans object boundary, just do multiple reads.
553 */
554 static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *to,
555 int *checkeof)
556 {
557 struct file *file = iocb->ki_filp;
558 struct inode *inode = file_inode(file);
559 struct page **pages;
560 u64 off = iocb->ki_pos;
561 int num_pages;
562 ssize_t ret;
563 size_t len = iov_iter_count(to);
564
565 dout("sync_read on file %p %llu~%u %s\n", file, off,
566 (unsigned)len,
567 (file->f_flags & O_DIRECT) ? "O_DIRECT" : "");
568
569 if (!len)
570 return 0;
571 /*
572 * flush any page cache pages in this range. this
573 * will make concurrent normal and sync io slow,
574 * but it will at least behave sensibly when they are
575 * in sequence.
576 */
577 ret = filemap_write_and_wait_range(inode->i_mapping, off,
578 off + len);
579 if (ret < 0)
580 return ret;
581
582 if (unlikely(to->type & ITER_PIPE)) {
583 size_t page_off;
584 ret = iov_iter_get_pages_alloc(to, &pages, len,
585 &page_off);
586 if (ret <= 0)
587 return -ENOMEM;
588 num_pages = DIV_ROUND_UP(ret + page_off, PAGE_SIZE);
589
590 ret = striped_read(inode, off, ret, pages, num_pages,
591 page_off, checkeof);
592 if (ret > 0) {
593 iov_iter_advance(to, ret);
594 off += ret;
595 } else {
596 iov_iter_advance(to, 0);
597 }
598 ceph_put_page_vector(pages, num_pages, false);
599 } else {
600 num_pages = calc_pages_for(off, len);
601 pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL);
602 if (IS_ERR(pages))
603 return PTR_ERR(pages);
604
605 ret = striped_read(inode, off, len, pages, num_pages,
606 (off & ~PAGE_MASK), checkeof);
607 if (ret > 0) {
608 int l, k = 0;
609 size_t left = ret;
610
611 while (left) {
612 size_t page_off = off & ~PAGE_MASK;
613 size_t copy = min_t(size_t, left,
614 PAGE_SIZE - page_off);
615 l = copy_page_to_iter(pages[k++], page_off,
616 copy, to);
617 off += l;
618 left -= l;
619 if (l < copy)
620 break;
621 }
622 }
623 ceph_release_page_vector(pages, num_pages);
624 }
625
626 if (off > iocb->ki_pos) {
627 ret = off - iocb->ki_pos;
628 iocb->ki_pos = off;
629 }
630
631 dout("sync_read result %zd\n", ret);
632 return ret;
633 }
634
635 struct ceph_aio_request {
636 struct kiocb *iocb;
637 size_t total_len;
638 int write;
639 int error;
640 struct list_head osd_reqs;
641 unsigned num_reqs;
642 atomic_t pending_reqs;
643 struct timespec mtime;
644 struct ceph_cap_flush *prealloc_cf;
645 };
646
647 struct ceph_aio_work {
648 struct work_struct work;
649 struct ceph_osd_request *req;
650 };
651
652 static void ceph_aio_retry_work(struct work_struct *work);
653
654 static void ceph_aio_complete(struct inode *inode,
655 struct ceph_aio_request *aio_req)
656 {
657 struct ceph_inode_info *ci = ceph_inode(inode);
658 int ret;
659
660 if (!atomic_dec_and_test(&aio_req->pending_reqs))
661 return;
662
663 ret = aio_req->error;
664 if (!ret)
665 ret = aio_req->total_len;
666
667 dout("ceph_aio_complete %p rc %d\n", inode, ret);
668
669 if (ret >= 0 && aio_req->write) {
670 int dirty;
671
672 loff_t endoff = aio_req->iocb->ki_pos + aio_req->total_len;
673 if (endoff > i_size_read(inode)) {
674 if (ceph_inode_set_size(inode, endoff))
675 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
676 }
677
678 spin_lock(&ci->i_ceph_lock);
679 ci->i_inline_version = CEPH_INLINE_NONE;
680 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
681 &aio_req->prealloc_cf);
682 spin_unlock(&ci->i_ceph_lock);
683 if (dirty)
684 __mark_inode_dirty(inode, dirty);
685
686 }
687
688 ceph_put_cap_refs(ci, (aio_req->write ? CEPH_CAP_FILE_WR :
689 CEPH_CAP_FILE_RD));
690
691 aio_req->iocb->ki_complete(aio_req->iocb, ret, 0);
692
693 ceph_free_cap_flush(aio_req->prealloc_cf);
694 kfree(aio_req);
695 }
696
697 static void ceph_aio_complete_req(struct ceph_osd_request *req)
698 {
699 int rc = req->r_result;
700 struct inode *inode = req->r_inode;
701 struct ceph_aio_request *aio_req = req->r_priv;
702 struct ceph_osd_data *osd_data = osd_req_op_extent_osd_data(req, 0);
703 int num_pages = calc_pages_for((u64)osd_data->alignment,
704 osd_data->length);
705
706 dout("ceph_aio_complete_req %p rc %d bytes %llu\n",
707 inode, rc, osd_data->length);
708
709 if (rc == -EOLDSNAPC) {
710 struct ceph_aio_work *aio_work;
711 BUG_ON(!aio_req->write);
712
713 aio_work = kmalloc(sizeof(*aio_work), GFP_NOFS);
714 if (aio_work) {
715 INIT_WORK(&aio_work->work, ceph_aio_retry_work);
716 aio_work->req = req;
717 queue_work(ceph_inode_to_client(inode)->wb_wq,
718 &aio_work->work);
719 return;
720 }
721 rc = -ENOMEM;
722 } else if (!aio_req->write) {
723 if (rc == -ENOENT)
724 rc = 0;
725 if (rc >= 0 && osd_data->length > rc) {
726 int zoff = osd_data->alignment + rc;
727 int zlen = osd_data->length - rc;
728 /*
729 * If read is satisfied by single OSD request,
730 * it can pass EOF. Otherwise read is within
731 * i_size.
732 */
733 if (aio_req->num_reqs == 1) {
734 loff_t i_size = i_size_read(inode);
735 loff_t endoff = aio_req->iocb->ki_pos + rc;
736 if (endoff < i_size)
737 zlen = min_t(size_t, zlen,
738 i_size - endoff);
739 aio_req->total_len = rc + zlen;
740 }
741
742 if (zlen > 0)
743 ceph_zero_page_vector_range(zoff, zlen,
744 osd_data->pages);
745 }
746 }
747
748 ceph_put_page_vector(osd_data->pages, num_pages, !aio_req->write);
749 ceph_osdc_put_request(req);
750
751 if (rc < 0)
752 cmpxchg(&aio_req->error, 0, rc);
753
754 ceph_aio_complete(inode, aio_req);
755 return;
756 }
757
758 static void ceph_aio_retry_work(struct work_struct *work)
759 {
760 struct ceph_aio_work *aio_work =
761 container_of(work, struct ceph_aio_work, work);
762 struct ceph_osd_request *orig_req = aio_work->req;
763 struct ceph_aio_request *aio_req = orig_req->r_priv;
764 struct inode *inode = orig_req->r_inode;
765 struct ceph_inode_info *ci = ceph_inode(inode);
766 struct ceph_snap_context *snapc;
767 struct ceph_osd_request *req;
768 int ret;
769
770 spin_lock(&ci->i_ceph_lock);
771 if (__ceph_have_pending_cap_snap(ci)) {
772 struct ceph_cap_snap *capsnap =
773 list_last_entry(&ci->i_cap_snaps,
774 struct ceph_cap_snap,
775 ci_item);
776 snapc = ceph_get_snap_context(capsnap->context);
777 } else {
778 BUG_ON(!ci->i_head_snapc);
779 snapc = ceph_get_snap_context(ci->i_head_snapc);
780 }
781 spin_unlock(&ci->i_ceph_lock);
782
783 req = ceph_osdc_alloc_request(orig_req->r_osdc, snapc, 2,
784 false, GFP_NOFS);
785 if (!req) {
786 ret = -ENOMEM;
787 req = orig_req;
788 goto out;
789 }
790
791 req->r_flags = CEPH_OSD_FLAG_ORDERSNAP | CEPH_OSD_FLAG_WRITE;
792 ceph_oloc_copy(&req->r_base_oloc, &orig_req->r_base_oloc);
793 ceph_oid_copy(&req->r_base_oid, &orig_req->r_base_oid);
794
795 ret = ceph_osdc_alloc_messages(req, GFP_NOFS);
796 if (ret) {
797 ceph_osdc_put_request(req);
798 req = orig_req;
799 goto out;
800 }
801
802 req->r_ops[0] = orig_req->r_ops[0];
803 osd_req_op_init(req, 1, CEPH_OSD_OP_STARTSYNC, 0);
804
805 req->r_mtime = aio_req->mtime;
806 req->r_data_offset = req->r_ops[0].extent.offset;
807
808 ceph_osdc_put_request(orig_req);
809
810 req->r_callback = ceph_aio_complete_req;
811 req->r_inode = inode;
812 req->r_priv = aio_req;
813 req->r_abort_on_full = true;
814
815 ret = ceph_osdc_start_request(req->r_osdc, req, false);
816 out:
817 if (ret < 0) {
818 req->r_result = ret;
819 ceph_aio_complete_req(req);
820 }
821
822 ceph_put_snap_context(snapc);
823 kfree(aio_work);
824 }
825
826 static ssize_t
827 ceph_direct_read_write(struct kiocb *iocb, struct iov_iter *iter,
828 struct ceph_snap_context *snapc,
829 struct ceph_cap_flush **pcf)
830 {
831 struct file *file = iocb->ki_filp;
832 struct inode *inode = file_inode(file);
833 struct ceph_inode_info *ci = ceph_inode(inode);
834 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
835 struct ceph_vino vino;
836 struct ceph_osd_request *req;
837 struct page **pages;
838 struct ceph_aio_request *aio_req = NULL;
839 int num_pages = 0;
840 int flags;
841 int ret;
842 struct timespec mtime = current_time(inode);
843 size_t count = iov_iter_count(iter);
844 loff_t pos = iocb->ki_pos;
845 bool write = iov_iter_rw(iter) == WRITE;
846
847 if (write && ceph_snap(file_inode(file)) != CEPH_NOSNAP)
848 return -EROFS;
849
850 dout("sync_direct_read_write (%s) on file %p %lld~%u\n",
851 (write ? "write" : "read"), file, pos, (unsigned)count);
852
853 ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + count);
854 if (ret < 0)
855 return ret;
856
857 if (write) {
858 int ret2 = invalidate_inode_pages2_range(inode->i_mapping,
859 pos >> PAGE_SHIFT,
860 (pos + count) >> PAGE_SHIFT);
861 if (ret2 < 0)
862 dout("invalidate_inode_pages2_range returned %d\n", ret2);
863
864 flags = CEPH_OSD_FLAG_ORDERSNAP | CEPH_OSD_FLAG_WRITE;
865 } else {
866 flags = CEPH_OSD_FLAG_READ;
867 }
868
869 while (iov_iter_count(iter) > 0) {
870 u64 size = dio_get_pagev_size(iter);
871 size_t start = 0;
872 ssize_t len;
873
874 vino = ceph_vino(inode);
875 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
876 vino, pos, &size, 0,
877 /*include a 'startsync' command*/
878 write ? 2 : 1,
879 write ? CEPH_OSD_OP_WRITE :
880 CEPH_OSD_OP_READ,
881 flags, snapc,
882 ci->i_truncate_seq,
883 ci->i_truncate_size,
884 false);
885 if (IS_ERR(req)) {
886 ret = PTR_ERR(req);
887 break;
888 }
889
890 len = size;
891 pages = dio_get_pages_alloc(iter, len, &start, &num_pages);
892 if (IS_ERR(pages)) {
893 ceph_osdc_put_request(req);
894 ret = PTR_ERR(pages);
895 break;
896 }
897
898 /*
899 * To simplify error handling, allow AIO when IO within i_size
900 * or IO can be satisfied by single OSD request.
901 */
902 if (pos == iocb->ki_pos && !is_sync_kiocb(iocb) &&
903 (len == count || pos + count <= i_size_read(inode))) {
904 aio_req = kzalloc(sizeof(*aio_req), GFP_KERNEL);
905 if (aio_req) {
906 aio_req->iocb = iocb;
907 aio_req->write = write;
908 INIT_LIST_HEAD(&aio_req->osd_reqs);
909 if (write) {
910 aio_req->mtime = mtime;
911 swap(aio_req->prealloc_cf, *pcf);
912 }
913 }
914 /* ignore error */
915 }
916
917 if (write) {
918 /*
919 * throw out any page cache pages in this range. this
920 * may block.
921 */
922 truncate_inode_pages_range(inode->i_mapping, pos,
923 (pos+len) | (PAGE_SIZE - 1));
924
925 osd_req_op_init(req, 1, CEPH_OSD_OP_STARTSYNC, 0);
926 req->r_mtime = mtime;
927 }
928
929 osd_req_op_extent_osd_data_pages(req, 0, pages, len, start,
930 false, false);
931
932 if (aio_req) {
933 aio_req->total_len += len;
934 aio_req->num_reqs++;
935 atomic_inc(&aio_req->pending_reqs);
936
937 req->r_callback = ceph_aio_complete_req;
938 req->r_inode = inode;
939 req->r_priv = aio_req;
940 list_add_tail(&req->r_unsafe_item, &aio_req->osd_reqs);
941
942 pos += len;
943 iov_iter_advance(iter, len);
944 continue;
945 }
946
947 ret = ceph_osdc_start_request(req->r_osdc, req, false);
948 if (!ret)
949 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
950
951 size = i_size_read(inode);
952 if (!write) {
953 if (ret == -ENOENT)
954 ret = 0;
955 if (ret >= 0 && ret < len && pos + ret < size) {
956 int zlen = min_t(size_t, len - ret,
957 size - pos - ret);
958 ceph_zero_page_vector_range(start + ret, zlen,
959 pages);
960 ret += zlen;
961 }
962 if (ret >= 0)
963 len = ret;
964 }
965
966 ceph_put_page_vector(pages, num_pages, !write);
967
968 ceph_osdc_put_request(req);
969 if (ret < 0)
970 break;
971
972 pos += len;
973 iov_iter_advance(iter, len);
974
975 if (!write && pos >= size)
976 break;
977
978 if (write && pos > size) {
979 if (ceph_inode_set_size(inode, pos))
980 ceph_check_caps(ceph_inode(inode),
981 CHECK_CAPS_AUTHONLY,
982 NULL);
983 }
984 }
985
986 if (aio_req) {
987 LIST_HEAD(osd_reqs);
988
989 if (aio_req->num_reqs == 0) {
990 kfree(aio_req);
991 return ret;
992 }
993
994 ceph_get_cap_refs(ci, write ? CEPH_CAP_FILE_WR :
995 CEPH_CAP_FILE_RD);
996
997 list_splice(&aio_req->osd_reqs, &osd_reqs);
998 while (!list_empty(&osd_reqs)) {
999 req = list_first_entry(&osd_reqs,
1000 struct ceph_osd_request,
1001 r_unsafe_item);
1002 list_del_init(&req->r_unsafe_item);
1003 if (ret >= 0)
1004 ret = ceph_osdc_start_request(req->r_osdc,
1005 req, false);
1006 if (ret < 0) {
1007 req->r_result = ret;
1008 ceph_aio_complete_req(req);
1009 }
1010 }
1011 return -EIOCBQUEUED;
1012 }
1013
1014 if (ret != -EOLDSNAPC && pos > iocb->ki_pos) {
1015 ret = pos - iocb->ki_pos;
1016 iocb->ki_pos = pos;
1017 }
1018 return ret;
1019 }
1020
1021 /*
1022 * Synchronous write, straight from __user pointer or user pages.
1023 *
1024 * If write spans object boundary, just do multiple writes. (For a
1025 * correct atomic write, we should e.g. take write locks on all
1026 * objects, rollback on failure, etc.)
1027 */
1028 static ssize_t
1029 ceph_sync_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos,
1030 struct ceph_snap_context *snapc)
1031 {
1032 struct file *file = iocb->ki_filp;
1033 struct inode *inode = file_inode(file);
1034 struct ceph_inode_info *ci = ceph_inode(inode);
1035 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1036 struct ceph_vino vino;
1037 struct ceph_osd_request *req;
1038 struct page **pages;
1039 u64 len;
1040 int num_pages;
1041 int written = 0;
1042 int flags;
1043 int check_caps = 0;
1044 int ret;
1045 struct timespec mtime = current_time(inode);
1046 size_t count = iov_iter_count(from);
1047
1048 if (ceph_snap(file_inode(file)) != CEPH_NOSNAP)
1049 return -EROFS;
1050
1051 dout("sync_write on file %p %lld~%u\n", file, pos, (unsigned)count);
1052
1053 ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + count);
1054 if (ret < 0)
1055 return ret;
1056
1057 ret = invalidate_inode_pages2_range(inode->i_mapping,
1058 pos >> PAGE_SHIFT,
1059 (pos + count) >> PAGE_SHIFT);
1060 if (ret < 0)
1061 dout("invalidate_inode_pages2_range returned %d\n", ret);
1062
1063 flags = CEPH_OSD_FLAG_ORDERSNAP | CEPH_OSD_FLAG_WRITE;
1064
1065 while ((len = iov_iter_count(from)) > 0) {
1066 size_t left;
1067 int n;
1068
1069 vino = ceph_vino(inode);
1070 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1071 vino, pos, &len, 0, 1,
1072 CEPH_OSD_OP_WRITE, flags, snapc,
1073 ci->i_truncate_seq,
1074 ci->i_truncate_size,
1075 false);
1076 if (IS_ERR(req)) {
1077 ret = PTR_ERR(req);
1078 break;
1079 }
1080
1081 /*
1082 * write from beginning of first page,
1083 * regardless of io alignment
1084 */
1085 num_pages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
1086
1087 pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL);
1088 if (IS_ERR(pages)) {
1089 ret = PTR_ERR(pages);
1090 goto out;
1091 }
1092
1093 left = len;
1094 for (n = 0; n < num_pages; n++) {
1095 size_t plen = min_t(size_t, left, PAGE_SIZE);
1096 ret = copy_page_from_iter(pages[n], 0, plen, from);
1097 if (ret != plen) {
1098 ret = -EFAULT;
1099 break;
1100 }
1101 left -= ret;
1102 }
1103
1104 if (ret < 0) {
1105 ceph_release_page_vector(pages, num_pages);
1106 goto out;
1107 }
1108
1109 req->r_inode = inode;
1110
1111 osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0,
1112 false, true);
1113
1114 req->r_mtime = mtime;
1115 ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
1116 if (!ret)
1117 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
1118
1119 out:
1120 ceph_osdc_put_request(req);
1121 if (ret != 0) {
1122 ceph_set_error_write(ci);
1123 break;
1124 }
1125
1126 ceph_clear_error_write(ci);
1127 pos += len;
1128 written += len;
1129 if (pos > i_size_read(inode)) {
1130 check_caps = ceph_inode_set_size(inode, pos);
1131 if (check_caps)
1132 ceph_check_caps(ceph_inode(inode),
1133 CHECK_CAPS_AUTHONLY,
1134 NULL);
1135 }
1136
1137 }
1138
1139 if (ret != -EOLDSNAPC && written > 0) {
1140 ret = written;
1141 iocb->ki_pos = pos;
1142 }
1143 return ret;
1144 }
1145
1146 /*
1147 * Wrap generic_file_aio_read with checks for cap bits on the inode.
1148 * Atomically grab references, so that those bits are not released
1149 * back to the MDS mid-read.
1150 *
1151 * Hmm, the sync read case isn't actually async... should it be?
1152 */
1153 static ssize_t ceph_read_iter(struct kiocb *iocb, struct iov_iter *to)
1154 {
1155 struct file *filp = iocb->ki_filp;
1156 struct ceph_file_info *fi = filp->private_data;
1157 size_t len = iov_iter_count(to);
1158 struct inode *inode = file_inode(filp);
1159 struct ceph_inode_info *ci = ceph_inode(inode);
1160 struct page *pinned_page = NULL;
1161 ssize_t ret;
1162 int want, got = 0;
1163 int retry_op = 0, read = 0;
1164
1165 again:
1166 dout("aio_read %p %llx.%llx %llu~%u trying to get caps on %p\n",
1167 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len, inode);
1168
1169 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1170 want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
1171 else
1172 want = CEPH_CAP_FILE_CACHE;
1173 ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, -1, &got, &pinned_page);
1174 if (ret < 0)
1175 return ret;
1176
1177 if ((got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0 ||
1178 (iocb->ki_flags & IOCB_DIRECT) ||
1179 (fi->flags & CEPH_F_SYNC)) {
1180
1181 dout("aio_sync_read %p %llx.%llx %llu~%u got cap refs on %s\n",
1182 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
1183 ceph_cap_string(got));
1184
1185 if (ci->i_inline_version == CEPH_INLINE_NONE) {
1186 if (!retry_op && (iocb->ki_flags & IOCB_DIRECT)) {
1187 ret = ceph_direct_read_write(iocb, to,
1188 NULL, NULL);
1189 if (ret >= 0 && ret < len)
1190 retry_op = CHECK_EOF;
1191 } else {
1192 ret = ceph_sync_read(iocb, to, &retry_op);
1193 }
1194 } else {
1195 retry_op = READ_INLINE;
1196 }
1197 } else {
1198 dout("aio_read %p %llx.%llx %llu~%u got cap refs on %s\n",
1199 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
1200 ceph_cap_string(got));
1201 current->journal_info = filp;
1202 ret = generic_file_read_iter(iocb, to);
1203 current->journal_info = NULL;
1204 }
1205 dout("aio_read %p %llx.%llx dropping cap refs on %s = %d\n",
1206 inode, ceph_vinop(inode), ceph_cap_string(got), (int)ret);
1207 if (pinned_page) {
1208 put_page(pinned_page);
1209 pinned_page = NULL;
1210 }
1211 ceph_put_cap_refs(ci, got);
1212 if (retry_op > HAVE_RETRIED && ret >= 0) {
1213 int statret;
1214 struct page *page = NULL;
1215 loff_t i_size;
1216 if (retry_op == READ_INLINE) {
1217 page = __page_cache_alloc(GFP_KERNEL);
1218 if (!page)
1219 return -ENOMEM;
1220 }
1221
1222 statret = __ceph_do_getattr(inode, page,
1223 CEPH_STAT_CAP_INLINE_DATA, !!page);
1224 if (statret < 0) {
1225 if (page)
1226 __free_page(page);
1227 if (statret == -ENODATA) {
1228 BUG_ON(retry_op != READ_INLINE);
1229 goto again;
1230 }
1231 return statret;
1232 }
1233
1234 i_size = i_size_read(inode);
1235 if (retry_op == READ_INLINE) {
1236 BUG_ON(ret > 0 || read > 0);
1237 if (iocb->ki_pos < i_size &&
1238 iocb->ki_pos < PAGE_SIZE) {
1239 loff_t end = min_t(loff_t, i_size,
1240 iocb->ki_pos + len);
1241 end = min_t(loff_t, end, PAGE_SIZE);
1242 if (statret < end)
1243 zero_user_segment(page, statret, end);
1244 ret = copy_page_to_iter(page,
1245 iocb->ki_pos & ~PAGE_MASK,
1246 end - iocb->ki_pos, to);
1247 iocb->ki_pos += ret;
1248 read += ret;
1249 }
1250 if (iocb->ki_pos < i_size && read < len) {
1251 size_t zlen = min_t(size_t, len - read,
1252 i_size - iocb->ki_pos);
1253 ret = iov_iter_zero(zlen, to);
1254 iocb->ki_pos += ret;
1255 read += ret;
1256 }
1257 __free_pages(page, 0);
1258 return read;
1259 }
1260
1261 /* hit EOF or hole? */
1262 if (retry_op == CHECK_EOF && iocb->ki_pos < i_size &&
1263 ret < len) {
1264 dout("sync_read hit hole, ppos %lld < size %lld"
1265 ", reading more\n", iocb->ki_pos, i_size);
1266
1267 read += ret;
1268 len -= ret;
1269 retry_op = HAVE_RETRIED;
1270 goto again;
1271 }
1272 }
1273
1274 if (ret >= 0)
1275 ret += read;
1276
1277 return ret;
1278 }
1279
1280 /*
1281 * Take cap references to avoid releasing caps to MDS mid-write.
1282 *
1283 * If we are synchronous, and write with an old snap context, the OSD
1284 * may return EOLDSNAPC. In that case, retry the write.. _after_
1285 * dropping our cap refs and allowing the pending snap to logically
1286 * complete _before_ this write occurs.
1287 *
1288 * If we are near ENOSPC, write synchronously.
1289 */
1290 static ssize_t ceph_write_iter(struct kiocb *iocb, struct iov_iter *from)
1291 {
1292 struct file *file = iocb->ki_filp;
1293 struct ceph_file_info *fi = file->private_data;
1294 struct inode *inode = file_inode(file);
1295 struct ceph_inode_info *ci = ceph_inode(inode);
1296 struct ceph_osd_client *osdc =
1297 &ceph_sb_to_client(inode->i_sb)->client->osdc;
1298 struct ceph_cap_flush *prealloc_cf;
1299 ssize_t count, written = 0;
1300 int err, want, got;
1301 loff_t pos;
1302
1303 if (ceph_snap(inode) != CEPH_NOSNAP)
1304 return -EROFS;
1305
1306 prealloc_cf = ceph_alloc_cap_flush();
1307 if (!prealloc_cf)
1308 return -ENOMEM;
1309
1310 inode_lock(inode);
1311
1312 /* We can write back this queue in page reclaim */
1313 current->backing_dev_info = inode_to_bdi(inode);
1314
1315 if (iocb->ki_flags & IOCB_APPEND) {
1316 err = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false);
1317 if (err < 0)
1318 goto out;
1319 }
1320
1321 err = generic_write_checks(iocb, from);
1322 if (err <= 0)
1323 goto out;
1324
1325 pos = iocb->ki_pos;
1326 count = iov_iter_count(from);
1327 err = file_remove_privs(file);
1328 if (err)
1329 goto out;
1330
1331 err = file_update_time(file);
1332 if (err)
1333 goto out;
1334
1335 if (ci->i_inline_version != CEPH_INLINE_NONE) {
1336 err = ceph_uninline_data(file, NULL);
1337 if (err < 0)
1338 goto out;
1339 }
1340
1341 retry_snap:
1342 /* FIXME: not complete since it doesn't account for being at quota */
1343 if (ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL)) {
1344 err = -ENOSPC;
1345 goto out;
1346 }
1347
1348 dout("aio_write %p %llx.%llx %llu~%zd getting caps. i_size %llu\n",
1349 inode, ceph_vinop(inode), pos, count, i_size_read(inode));
1350 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1351 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
1352 else
1353 want = CEPH_CAP_FILE_BUFFER;
1354 got = 0;
1355 err = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, pos + count,
1356 &got, NULL);
1357 if (err < 0)
1358 goto out;
1359
1360 dout("aio_write %p %llx.%llx %llu~%zd got cap refs on %s\n",
1361 inode, ceph_vinop(inode), pos, count, ceph_cap_string(got));
1362
1363 if ((got & (CEPH_CAP_FILE_BUFFER|CEPH_CAP_FILE_LAZYIO)) == 0 ||
1364 (iocb->ki_flags & IOCB_DIRECT) || (fi->flags & CEPH_F_SYNC) ||
1365 (ci->i_ceph_flags & CEPH_I_ERROR_WRITE)) {
1366 struct ceph_snap_context *snapc;
1367 struct iov_iter data;
1368 inode_unlock(inode);
1369
1370 spin_lock(&ci->i_ceph_lock);
1371 if (__ceph_have_pending_cap_snap(ci)) {
1372 struct ceph_cap_snap *capsnap =
1373 list_last_entry(&ci->i_cap_snaps,
1374 struct ceph_cap_snap,
1375 ci_item);
1376 snapc = ceph_get_snap_context(capsnap->context);
1377 } else {
1378 BUG_ON(!ci->i_head_snapc);
1379 snapc = ceph_get_snap_context(ci->i_head_snapc);
1380 }
1381 spin_unlock(&ci->i_ceph_lock);
1382
1383 /* we might need to revert back to that point */
1384 data = *from;
1385 if (iocb->ki_flags & IOCB_DIRECT)
1386 written = ceph_direct_read_write(iocb, &data, snapc,
1387 &prealloc_cf);
1388 else
1389 written = ceph_sync_write(iocb, &data, pos, snapc);
1390 if (written == -EOLDSNAPC) {
1391 dout("aio_write %p %llx.%llx %llu~%u"
1392 "got EOLDSNAPC, retrying\n",
1393 inode, ceph_vinop(inode),
1394 pos, (unsigned)count);
1395 inode_lock(inode);
1396 goto retry_snap;
1397 }
1398 if (written > 0)
1399 iov_iter_advance(from, written);
1400 ceph_put_snap_context(snapc);
1401 } else {
1402 /*
1403 * No need to acquire the i_truncate_mutex. Because
1404 * the MDS revokes Fwb caps before sending truncate
1405 * message to us. We can't get Fwb cap while there
1406 * are pending vmtruncate. So write and vmtruncate
1407 * can not run at the same time
1408 */
1409 written = generic_perform_write(file, from, pos);
1410 if (likely(written >= 0))
1411 iocb->ki_pos = pos + written;
1412 inode_unlock(inode);
1413 }
1414
1415 if (written >= 0) {
1416 int dirty;
1417 spin_lock(&ci->i_ceph_lock);
1418 ci->i_inline_version = CEPH_INLINE_NONE;
1419 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
1420 &prealloc_cf);
1421 spin_unlock(&ci->i_ceph_lock);
1422 if (dirty)
1423 __mark_inode_dirty(inode, dirty);
1424 }
1425
1426 dout("aio_write %p %llx.%llx %llu~%u dropping cap refs on %s\n",
1427 inode, ceph_vinop(inode), pos, (unsigned)count,
1428 ceph_cap_string(got));
1429 ceph_put_cap_refs(ci, got);
1430
1431 if (written >= 0) {
1432 if (ceph_osdmap_flag(osdc, CEPH_OSDMAP_NEARFULL))
1433 iocb->ki_flags |= IOCB_DSYNC;
1434
1435 written = generic_write_sync(iocb, written);
1436 }
1437
1438 goto out_unlocked;
1439
1440 out:
1441 inode_unlock(inode);
1442 out_unlocked:
1443 ceph_free_cap_flush(prealloc_cf);
1444 current->backing_dev_info = NULL;
1445 return written ? written : err;
1446 }
1447
1448 /*
1449 * llseek. be sure to verify file size on SEEK_END.
1450 */
1451 static loff_t ceph_llseek(struct file *file, loff_t offset, int whence)
1452 {
1453 struct inode *inode = file->f_mapping->host;
1454 loff_t i_size;
1455 loff_t ret;
1456
1457 inode_lock(inode);
1458
1459 if (whence == SEEK_END || whence == SEEK_DATA || whence == SEEK_HOLE) {
1460 ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false);
1461 if (ret < 0)
1462 goto out;
1463 }
1464
1465 i_size = i_size_read(inode);
1466 switch (whence) {
1467 case SEEK_END:
1468 offset += i_size;
1469 break;
1470 case SEEK_CUR:
1471 /*
1472 * Here we special-case the lseek(fd, 0, SEEK_CUR)
1473 * position-querying operation. Avoid rewriting the "same"
1474 * f_pos value back to the file because a concurrent read(),
1475 * write() or lseek() might have altered it
1476 */
1477 if (offset == 0) {
1478 ret = file->f_pos;
1479 goto out;
1480 }
1481 offset += file->f_pos;
1482 break;
1483 case SEEK_DATA:
1484 if (offset >= i_size) {
1485 ret = -ENXIO;
1486 goto out;
1487 }
1488 break;
1489 case SEEK_HOLE:
1490 if (offset >= i_size) {
1491 ret = -ENXIO;
1492 goto out;
1493 }
1494 offset = i_size;
1495 break;
1496 }
1497
1498 ret = vfs_setpos(file, offset, inode->i_sb->s_maxbytes);
1499
1500 out:
1501 inode_unlock(inode);
1502 return ret;
1503 }
1504
1505 static inline void ceph_zero_partial_page(
1506 struct inode *inode, loff_t offset, unsigned size)
1507 {
1508 struct page *page;
1509 pgoff_t index = offset >> PAGE_SHIFT;
1510
1511 page = find_lock_page(inode->i_mapping, index);
1512 if (page) {
1513 wait_on_page_writeback(page);
1514 zero_user(page, offset & (PAGE_SIZE - 1), size);
1515 unlock_page(page);
1516 put_page(page);
1517 }
1518 }
1519
1520 static void ceph_zero_pagecache_range(struct inode *inode, loff_t offset,
1521 loff_t length)
1522 {
1523 loff_t nearly = round_up(offset, PAGE_SIZE);
1524 if (offset < nearly) {
1525 loff_t size = nearly - offset;
1526 if (length < size)
1527 size = length;
1528 ceph_zero_partial_page(inode, offset, size);
1529 offset += size;
1530 length -= size;
1531 }
1532 if (length >= PAGE_SIZE) {
1533 loff_t size = round_down(length, PAGE_SIZE);
1534 truncate_pagecache_range(inode, offset, offset + size - 1);
1535 offset += size;
1536 length -= size;
1537 }
1538 if (length)
1539 ceph_zero_partial_page(inode, offset, length);
1540 }
1541
1542 static int ceph_zero_partial_object(struct inode *inode,
1543 loff_t offset, loff_t *length)
1544 {
1545 struct ceph_inode_info *ci = ceph_inode(inode);
1546 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1547 struct ceph_osd_request *req;
1548 int ret = 0;
1549 loff_t zero = 0;
1550 int op;
1551
1552 if (!length) {
1553 op = offset ? CEPH_OSD_OP_DELETE : CEPH_OSD_OP_TRUNCATE;
1554 length = &zero;
1555 } else {
1556 op = CEPH_OSD_OP_ZERO;
1557 }
1558
1559 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1560 ceph_vino(inode),
1561 offset, length,
1562 0, 1, op,
1563 CEPH_OSD_FLAG_WRITE,
1564 NULL, 0, 0, false);
1565 if (IS_ERR(req)) {
1566 ret = PTR_ERR(req);
1567 goto out;
1568 }
1569
1570 req->r_mtime = inode->i_mtime;
1571 ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
1572 if (!ret) {
1573 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
1574 if (ret == -ENOENT)
1575 ret = 0;
1576 }
1577 ceph_osdc_put_request(req);
1578
1579 out:
1580 return ret;
1581 }
1582
1583 static int ceph_zero_objects(struct inode *inode, loff_t offset, loff_t length)
1584 {
1585 int ret = 0;
1586 struct ceph_inode_info *ci = ceph_inode(inode);
1587 s32 stripe_unit = ci->i_layout.stripe_unit;
1588 s32 stripe_count = ci->i_layout.stripe_count;
1589 s32 object_size = ci->i_layout.object_size;
1590 u64 object_set_size = object_size * stripe_count;
1591 u64 nearly, t;
1592
1593 /* round offset up to next period boundary */
1594 nearly = offset + object_set_size - 1;
1595 t = nearly;
1596 nearly -= do_div(t, object_set_size);
1597
1598 while (length && offset < nearly) {
1599 loff_t size = length;
1600 ret = ceph_zero_partial_object(inode, offset, &size);
1601 if (ret < 0)
1602 return ret;
1603 offset += size;
1604 length -= size;
1605 }
1606 while (length >= object_set_size) {
1607 int i;
1608 loff_t pos = offset;
1609 for (i = 0; i < stripe_count; ++i) {
1610 ret = ceph_zero_partial_object(inode, pos, NULL);
1611 if (ret < 0)
1612 return ret;
1613 pos += stripe_unit;
1614 }
1615 offset += object_set_size;
1616 length -= object_set_size;
1617 }
1618 while (length) {
1619 loff_t size = length;
1620 ret = ceph_zero_partial_object(inode, offset, &size);
1621 if (ret < 0)
1622 return ret;
1623 offset += size;
1624 length -= size;
1625 }
1626 return ret;
1627 }
1628
1629 static long ceph_fallocate(struct file *file, int mode,
1630 loff_t offset, loff_t length)
1631 {
1632 struct ceph_file_info *fi = file->private_data;
1633 struct inode *inode = file_inode(file);
1634 struct ceph_inode_info *ci = ceph_inode(inode);
1635 struct ceph_osd_client *osdc =
1636 &ceph_inode_to_client(inode)->client->osdc;
1637 struct ceph_cap_flush *prealloc_cf;
1638 int want, got = 0;
1639 int dirty;
1640 int ret = 0;
1641 loff_t endoff = 0;
1642 loff_t size;
1643
1644 if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
1645 return -EOPNOTSUPP;
1646
1647 if (!S_ISREG(inode->i_mode))
1648 return -EOPNOTSUPP;
1649
1650 prealloc_cf = ceph_alloc_cap_flush();
1651 if (!prealloc_cf)
1652 return -ENOMEM;
1653
1654 inode_lock(inode);
1655
1656 if (ceph_snap(inode) != CEPH_NOSNAP) {
1657 ret = -EROFS;
1658 goto unlock;
1659 }
1660
1661 if (ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL) &&
1662 !(mode & FALLOC_FL_PUNCH_HOLE)) {
1663 ret = -ENOSPC;
1664 goto unlock;
1665 }
1666
1667 if (ci->i_inline_version != CEPH_INLINE_NONE) {
1668 ret = ceph_uninline_data(file, NULL);
1669 if (ret < 0)
1670 goto unlock;
1671 }
1672
1673 size = i_size_read(inode);
1674 if (!(mode & FALLOC_FL_KEEP_SIZE)) {
1675 endoff = offset + length;
1676 ret = inode_newsize_ok(inode, endoff);
1677 if (ret)
1678 goto unlock;
1679 }
1680
1681 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1682 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
1683 else
1684 want = CEPH_CAP_FILE_BUFFER;
1685
1686 ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, endoff, &got, NULL);
1687 if (ret < 0)
1688 goto unlock;
1689
1690 if (mode & FALLOC_FL_PUNCH_HOLE) {
1691 if (offset < size)
1692 ceph_zero_pagecache_range(inode, offset, length);
1693 ret = ceph_zero_objects(inode, offset, length);
1694 } else if (endoff > size) {
1695 truncate_pagecache_range(inode, size, -1);
1696 if (ceph_inode_set_size(inode, endoff))
1697 ceph_check_caps(ceph_inode(inode),
1698 CHECK_CAPS_AUTHONLY, NULL);
1699 }
1700
1701 if (!ret) {
1702 spin_lock(&ci->i_ceph_lock);
1703 ci->i_inline_version = CEPH_INLINE_NONE;
1704 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
1705 &prealloc_cf);
1706 spin_unlock(&ci->i_ceph_lock);
1707 if (dirty)
1708 __mark_inode_dirty(inode, dirty);
1709 }
1710
1711 ceph_put_cap_refs(ci, got);
1712 unlock:
1713 inode_unlock(inode);
1714 ceph_free_cap_flush(prealloc_cf);
1715 return ret;
1716 }
1717
1718 const struct file_operations ceph_file_fops = {
1719 .open = ceph_open,
1720 .release = ceph_release,
1721 .llseek = ceph_llseek,
1722 .read_iter = ceph_read_iter,
1723 .write_iter = ceph_write_iter,
1724 .mmap = ceph_mmap,
1725 .fsync = ceph_fsync,
1726 .lock = ceph_lock,
1727 .flock = ceph_flock,
1728 .splice_read = generic_file_splice_read,
1729 .splice_write = iter_file_splice_write,
1730 .unlocked_ioctl = ceph_ioctl,
1731 .compat_ioctl = ceph_ioctl,
1732 .fallocate = ceph_fallocate,
1733 };
1734