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Merge branch 'x86/asm' into x86/urgent, to pick up fix
[deliverable/linux.git] / fs / ceph / file.c
1 #include <linux/ceph/ceph_debug.h>
2
3 #include <linux/module.h>
4 #include <linux/sched.h>
5 #include <linux/slab.h>
6 #include <linux/file.h>
7 #include <linux/mount.h>
8 #include <linux/namei.h>
9 #include <linux/writeback.h>
10 #include <linux/falloc.h>
11
12 #include "super.h"
13 #include "mds_client.h"
14 #include "cache.h"
15
16 /*
17 * Ceph file operations
18 *
19 * Implement basic open/close functionality, and implement
20 * read/write.
21 *
22 * We implement three modes of file I/O:
23 * - buffered uses the generic_file_aio_{read,write} helpers
24 *
25 * - synchronous is used when there is multi-client read/write
26 * sharing, avoids the page cache, and synchronously waits for an
27 * ack from the OSD.
28 *
29 * - direct io takes the variant of the sync path that references
30 * user pages directly.
31 *
32 * fsync() flushes and waits on dirty pages, but just queues metadata
33 * for writeback: since the MDS can recover size and mtime there is no
34 * need to wait for MDS acknowledgement.
35 */
36
37 /*
38 * Calculate the length sum of direct io vectors that can
39 * be combined into one page vector.
40 */
41 static size_t dio_get_pagev_size(const struct iov_iter *it)
42 {
43 const struct iovec *iov = it->iov;
44 const struct iovec *iovend = iov + it->nr_segs;
45 size_t size;
46
47 size = iov->iov_len - it->iov_offset;
48 /*
49 * An iov can be page vectored when both the current tail
50 * and the next base are page aligned.
51 */
52 while (PAGE_ALIGNED((iov->iov_base + iov->iov_len)) &&
53 (++iov < iovend && PAGE_ALIGNED((iov->iov_base)))) {
54 size += iov->iov_len;
55 }
56 dout("dio_get_pagevlen len = %zu\n", size);
57 return size;
58 }
59
60 /*
61 * Allocate a page vector based on (@it, @nbytes).
62 * The return value is the tuple describing a page vector,
63 * that is (@pages, @page_align, @num_pages).
64 */
65 static struct page **
66 dio_get_pages_alloc(const struct iov_iter *it, size_t nbytes,
67 size_t *page_align, int *num_pages)
68 {
69 struct iov_iter tmp_it = *it;
70 size_t align;
71 struct page **pages;
72 int ret = 0, idx, npages;
73
74 align = (unsigned long)(it->iov->iov_base + it->iov_offset) &
75 (PAGE_SIZE - 1);
76 npages = calc_pages_for(align, nbytes);
77 pages = kmalloc(sizeof(*pages) * npages, GFP_KERNEL);
78 if (!pages) {
79 pages = vmalloc(sizeof(*pages) * npages);
80 if (!pages)
81 return ERR_PTR(-ENOMEM);
82 }
83
84 for (idx = 0; idx < npages; ) {
85 size_t start;
86 ret = iov_iter_get_pages(&tmp_it, pages + idx, nbytes,
87 npages - idx, &start);
88 if (ret < 0)
89 goto fail;
90
91 iov_iter_advance(&tmp_it, ret);
92 nbytes -= ret;
93 idx += (ret + start + PAGE_SIZE - 1) / PAGE_SIZE;
94 }
95
96 BUG_ON(nbytes != 0);
97 *num_pages = npages;
98 *page_align = align;
99 dout("dio_get_pages_alloc: got %d pages align %zu\n", npages, align);
100 return pages;
101 fail:
102 ceph_put_page_vector(pages, idx, false);
103 return ERR_PTR(ret);
104 }
105
106 /*
107 * Prepare an open request. Preallocate ceph_cap to avoid an
108 * inopportune ENOMEM later.
109 */
110 static struct ceph_mds_request *
111 prepare_open_request(struct super_block *sb, int flags, int create_mode)
112 {
113 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
114 struct ceph_mds_client *mdsc = fsc->mdsc;
115 struct ceph_mds_request *req;
116 int want_auth = USE_ANY_MDS;
117 int op = (flags & O_CREAT) ? CEPH_MDS_OP_CREATE : CEPH_MDS_OP_OPEN;
118
119 if (flags & (O_WRONLY|O_RDWR|O_CREAT|O_TRUNC))
120 want_auth = USE_AUTH_MDS;
121
122 req = ceph_mdsc_create_request(mdsc, op, want_auth);
123 if (IS_ERR(req))
124 goto out;
125 req->r_fmode = ceph_flags_to_mode(flags);
126 req->r_args.open.flags = cpu_to_le32(flags);
127 req->r_args.open.mode = cpu_to_le32(create_mode);
128 out:
129 return req;
130 }
131
132 /*
133 * initialize private struct file data.
134 * if we fail, clean up by dropping fmode reference on the ceph_inode
135 */
136 static int ceph_init_file(struct inode *inode, struct file *file, int fmode)
137 {
138 struct ceph_file_info *cf;
139 int ret = 0;
140
141 switch (inode->i_mode & S_IFMT) {
142 case S_IFREG:
143 ceph_fscache_register_inode_cookie(inode);
144 ceph_fscache_file_set_cookie(inode, file);
145 case S_IFDIR:
146 dout("init_file %p %p 0%o (regular)\n", inode, file,
147 inode->i_mode);
148 cf = kmem_cache_zalloc(ceph_file_cachep, GFP_KERNEL);
149 if (cf == NULL) {
150 ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */
151 return -ENOMEM;
152 }
153 cf->fmode = fmode;
154 cf->next_offset = 2;
155 cf->readdir_cache_idx = -1;
156 file->private_data = cf;
157 BUG_ON(inode->i_fop->release != ceph_release);
158 break;
159
160 case S_IFLNK:
161 dout("init_file %p %p 0%o (symlink)\n", inode, file,
162 inode->i_mode);
163 ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */
164 break;
165
166 default:
167 dout("init_file %p %p 0%o (special)\n", inode, file,
168 inode->i_mode);
169 /*
170 * we need to drop the open ref now, since we don't
171 * have .release set to ceph_release.
172 */
173 ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */
174 BUG_ON(inode->i_fop->release == ceph_release);
175
176 /* call the proper open fop */
177 ret = inode->i_fop->open(inode, file);
178 }
179 return ret;
180 }
181
182 /*
183 * try renew caps after session gets killed.
184 */
185 int ceph_renew_caps(struct inode *inode)
186 {
187 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
188 struct ceph_inode_info *ci = ceph_inode(inode);
189 struct ceph_mds_request *req;
190 int err, flags, wanted;
191
192 spin_lock(&ci->i_ceph_lock);
193 wanted = __ceph_caps_file_wanted(ci);
194 if (__ceph_is_any_real_caps(ci) &&
195 (!(wanted & CEPH_CAP_ANY_WR) == 0 || ci->i_auth_cap)) {
196 int issued = __ceph_caps_issued(ci, NULL);
197 spin_unlock(&ci->i_ceph_lock);
198 dout("renew caps %p want %s issued %s updating mds_wanted\n",
199 inode, ceph_cap_string(wanted), ceph_cap_string(issued));
200 ceph_check_caps(ci, 0, NULL);
201 return 0;
202 }
203 spin_unlock(&ci->i_ceph_lock);
204
205 flags = 0;
206 if ((wanted & CEPH_CAP_FILE_RD) && (wanted & CEPH_CAP_FILE_WR))
207 flags = O_RDWR;
208 else if (wanted & CEPH_CAP_FILE_RD)
209 flags = O_RDONLY;
210 else if (wanted & CEPH_CAP_FILE_WR)
211 flags = O_WRONLY;
212 #ifdef O_LAZY
213 if (wanted & CEPH_CAP_FILE_LAZYIO)
214 flags |= O_LAZY;
215 #endif
216
217 req = prepare_open_request(inode->i_sb, flags, 0);
218 if (IS_ERR(req)) {
219 err = PTR_ERR(req);
220 goto out;
221 }
222
223 req->r_inode = inode;
224 ihold(inode);
225 req->r_num_caps = 1;
226 req->r_fmode = -1;
227
228 err = ceph_mdsc_do_request(mdsc, NULL, req);
229 ceph_mdsc_put_request(req);
230 out:
231 dout("renew caps %p open result=%d\n", inode, err);
232 return err < 0 ? err : 0;
233 }
234
235 /*
236 * If we already have the requisite capabilities, we can satisfy
237 * the open request locally (no need to request new caps from the
238 * MDS). We do, however, need to inform the MDS (asynchronously)
239 * if our wanted caps set expands.
240 */
241 int ceph_open(struct inode *inode, struct file *file)
242 {
243 struct ceph_inode_info *ci = ceph_inode(inode);
244 struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
245 struct ceph_mds_client *mdsc = fsc->mdsc;
246 struct ceph_mds_request *req;
247 struct ceph_file_info *cf = file->private_data;
248 int err;
249 int flags, fmode, wanted;
250
251 if (cf) {
252 dout("open file %p is already opened\n", file);
253 return 0;
254 }
255
256 /* filter out O_CREAT|O_EXCL; vfs did that already. yuck. */
257 flags = file->f_flags & ~(O_CREAT|O_EXCL);
258 if (S_ISDIR(inode->i_mode))
259 flags = O_DIRECTORY; /* mds likes to know */
260
261 dout("open inode %p ino %llx.%llx file %p flags %d (%d)\n", inode,
262 ceph_vinop(inode), file, flags, file->f_flags);
263 fmode = ceph_flags_to_mode(flags);
264 wanted = ceph_caps_for_mode(fmode);
265
266 /* snapped files are read-only */
267 if (ceph_snap(inode) != CEPH_NOSNAP && (file->f_mode & FMODE_WRITE))
268 return -EROFS;
269
270 /* trivially open snapdir */
271 if (ceph_snap(inode) == CEPH_SNAPDIR) {
272 spin_lock(&ci->i_ceph_lock);
273 __ceph_get_fmode(ci, fmode);
274 spin_unlock(&ci->i_ceph_lock);
275 return ceph_init_file(inode, file, fmode);
276 }
277
278 /*
279 * No need to block if we have caps on the auth MDS (for
280 * write) or any MDS (for read). Update wanted set
281 * asynchronously.
282 */
283 spin_lock(&ci->i_ceph_lock);
284 if (__ceph_is_any_real_caps(ci) &&
285 (((fmode & CEPH_FILE_MODE_WR) == 0) || ci->i_auth_cap)) {
286 int mds_wanted = __ceph_caps_mds_wanted(ci);
287 int issued = __ceph_caps_issued(ci, NULL);
288
289 dout("open %p fmode %d want %s issued %s using existing\n",
290 inode, fmode, ceph_cap_string(wanted),
291 ceph_cap_string(issued));
292 __ceph_get_fmode(ci, fmode);
293 spin_unlock(&ci->i_ceph_lock);
294
295 /* adjust wanted? */
296 if ((issued & wanted) != wanted &&
297 (mds_wanted & wanted) != wanted &&
298 ceph_snap(inode) != CEPH_SNAPDIR)
299 ceph_check_caps(ci, 0, NULL);
300
301 return ceph_init_file(inode, file, fmode);
302 } else if (ceph_snap(inode) != CEPH_NOSNAP &&
303 (ci->i_snap_caps & wanted) == wanted) {
304 __ceph_get_fmode(ci, fmode);
305 spin_unlock(&ci->i_ceph_lock);
306 return ceph_init_file(inode, file, fmode);
307 }
308
309 spin_unlock(&ci->i_ceph_lock);
310
311 dout("open fmode %d wants %s\n", fmode, ceph_cap_string(wanted));
312 req = prepare_open_request(inode->i_sb, flags, 0);
313 if (IS_ERR(req)) {
314 err = PTR_ERR(req);
315 goto out;
316 }
317 req->r_inode = inode;
318 ihold(inode);
319
320 req->r_num_caps = 1;
321 err = ceph_mdsc_do_request(mdsc, NULL, req);
322 if (!err)
323 err = ceph_init_file(inode, file, req->r_fmode);
324 ceph_mdsc_put_request(req);
325 dout("open result=%d on %llx.%llx\n", err, ceph_vinop(inode));
326 out:
327 return err;
328 }
329
330
331 /*
332 * Do a lookup + open with a single request. If we get a non-existent
333 * file or symlink, return 1 so the VFS can retry.
334 */
335 int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
336 struct file *file, unsigned flags, umode_t mode,
337 int *opened)
338 {
339 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
340 struct ceph_mds_client *mdsc = fsc->mdsc;
341 struct ceph_mds_request *req;
342 struct dentry *dn;
343 struct ceph_acls_info acls = {};
344 int mask;
345 int err;
346
347 dout("atomic_open %p dentry %p '%pd' %s flags %d mode 0%o\n",
348 dir, dentry, dentry,
349 d_unhashed(dentry) ? "unhashed" : "hashed", flags, mode);
350
351 if (dentry->d_name.len > NAME_MAX)
352 return -ENAMETOOLONG;
353
354 err = ceph_init_dentry(dentry);
355 if (err < 0)
356 return err;
357
358 if (flags & O_CREAT) {
359 err = ceph_pre_init_acls(dir, &mode, &acls);
360 if (err < 0)
361 return err;
362 }
363
364 /* do the open */
365 req = prepare_open_request(dir->i_sb, flags, mode);
366 if (IS_ERR(req)) {
367 err = PTR_ERR(req);
368 goto out_acl;
369 }
370 req->r_dentry = dget(dentry);
371 req->r_num_caps = 2;
372 if (flags & O_CREAT) {
373 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
374 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
375 if (acls.pagelist) {
376 req->r_pagelist = acls.pagelist;
377 acls.pagelist = NULL;
378 }
379 }
380
381 mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED;
382 if (ceph_security_xattr_wanted(dir))
383 mask |= CEPH_CAP_XATTR_SHARED;
384 req->r_args.open.mask = cpu_to_le32(mask);
385
386 req->r_locked_dir = dir; /* caller holds dir->i_mutex */
387 err = ceph_mdsc_do_request(mdsc,
388 (flags & (O_CREAT|O_TRUNC)) ? dir : NULL,
389 req);
390 err = ceph_handle_snapdir(req, dentry, err);
391 if (err)
392 goto out_req;
393
394 if ((flags & O_CREAT) && !req->r_reply_info.head->is_dentry)
395 err = ceph_handle_notrace_create(dir, dentry);
396
397 if (d_in_lookup(dentry)) {
398 dn = ceph_finish_lookup(req, dentry, err);
399 if (IS_ERR(dn))
400 err = PTR_ERR(dn);
401 } else {
402 /* we were given a hashed negative dentry */
403 dn = NULL;
404 }
405 if (err)
406 goto out_req;
407 if (dn || d_really_is_negative(dentry) || d_is_symlink(dentry)) {
408 /* make vfs retry on splice, ENOENT, or symlink */
409 dout("atomic_open finish_no_open on dn %p\n", dn);
410 err = finish_no_open(file, dn);
411 } else {
412 dout("atomic_open finish_open on dn %p\n", dn);
413 if (req->r_op == CEPH_MDS_OP_CREATE && req->r_reply_info.has_create_ino) {
414 ceph_init_inode_acls(d_inode(dentry), &acls);
415 *opened |= FILE_CREATED;
416 }
417 err = finish_open(file, dentry, ceph_open, opened);
418 }
419 out_req:
420 if (!req->r_err && req->r_target_inode)
421 ceph_put_fmode(ceph_inode(req->r_target_inode), req->r_fmode);
422 ceph_mdsc_put_request(req);
423 out_acl:
424 ceph_release_acls_info(&acls);
425 dout("atomic_open result=%d\n", err);
426 return err;
427 }
428
429 int ceph_release(struct inode *inode, struct file *file)
430 {
431 struct ceph_inode_info *ci = ceph_inode(inode);
432 struct ceph_file_info *cf = file->private_data;
433
434 dout("release inode %p file %p\n", inode, file);
435 ceph_put_fmode(ci, cf->fmode);
436 if (cf->last_readdir)
437 ceph_mdsc_put_request(cf->last_readdir);
438 kfree(cf->last_name);
439 kfree(cf->dir_info);
440 kmem_cache_free(ceph_file_cachep, cf);
441
442 /* wake up anyone waiting for caps on this inode */
443 wake_up_all(&ci->i_cap_wq);
444 return 0;
445 }
446
447 enum {
448 HAVE_RETRIED = 1,
449 CHECK_EOF = 2,
450 READ_INLINE = 3,
451 };
452
453 /*
454 * Read a range of bytes striped over one or more objects. Iterate over
455 * objects we stripe over. (That's not atomic, but good enough for now.)
456 *
457 * If we get a short result from the OSD, check against i_size; we need to
458 * only return a short read to the caller if we hit EOF.
459 */
460 static int striped_read(struct inode *inode,
461 u64 off, u64 len,
462 struct page **pages, int num_pages,
463 int *checkeof)
464 {
465 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
466 struct ceph_inode_info *ci = ceph_inode(inode);
467 u64 pos, this_len, left;
468 loff_t i_size;
469 int page_align, pages_left;
470 int read, ret;
471 struct page **page_pos;
472 bool hit_stripe, was_short;
473
474 /*
475 * we may need to do multiple reads. not atomic, unfortunately.
476 */
477 pos = off;
478 left = len;
479 page_pos = pages;
480 pages_left = num_pages;
481 read = 0;
482
483 more:
484 page_align = pos & ~PAGE_MASK;
485 this_len = left;
486 ret = ceph_osdc_readpages(&fsc->client->osdc, ceph_vino(inode),
487 &ci->i_layout, pos, &this_len,
488 ci->i_truncate_seq,
489 ci->i_truncate_size,
490 page_pos, pages_left, page_align);
491 if (ret == -ENOENT)
492 ret = 0;
493 hit_stripe = this_len < left;
494 was_short = ret >= 0 && ret < this_len;
495 dout("striped_read %llu~%llu (read %u) got %d%s%s\n", pos, left, read,
496 ret, hit_stripe ? " HITSTRIPE" : "", was_short ? " SHORT" : "");
497
498 i_size = i_size_read(inode);
499 if (ret >= 0) {
500 int didpages;
501 if (was_short && (pos + ret < i_size)) {
502 int zlen = min(this_len - ret, i_size - pos - ret);
503 int zoff = (off & ~PAGE_MASK) + read + ret;
504 dout(" zero gap %llu to %llu\n",
505 pos + ret, pos + ret + zlen);
506 ceph_zero_page_vector_range(zoff, zlen, pages);
507 ret += zlen;
508 }
509
510 didpages = (page_align + ret) >> PAGE_SHIFT;
511 pos += ret;
512 read = pos - off;
513 left -= ret;
514 page_pos += didpages;
515 pages_left -= didpages;
516
517 /* hit stripe and need continue*/
518 if (left && hit_stripe && pos < i_size)
519 goto more;
520 }
521
522 if (read > 0) {
523 ret = read;
524 /* did we bounce off eof? */
525 if (pos + left > i_size)
526 *checkeof = CHECK_EOF;
527 }
528
529 dout("striped_read returns %d\n", ret);
530 return ret;
531 }
532
533 /*
534 * Completely synchronous read and write methods. Direct from __user
535 * buffer to osd, or directly to user pages (if O_DIRECT).
536 *
537 * If the read spans object boundary, just do multiple reads.
538 */
539 static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *i,
540 int *checkeof)
541 {
542 struct file *file = iocb->ki_filp;
543 struct inode *inode = file_inode(file);
544 struct page **pages;
545 u64 off = iocb->ki_pos;
546 int num_pages, ret;
547 size_t len = iov_iter_count(i);
548
549 dout("sync_read on file %p %llu~%u %s\n", file, off,
550 (unsigned)len,
551 (file->f_flags & O_DIRECT) ? "O_DIRECT" : "");
552
553 if (!len)
554 return 0;
555 /*
556 * flush any page cache pages in this range. this
557 * will make concurrent normal and sync io slow,
558 * but it will at least behave sensibly when they are
559 * in sequence.
560 */
561 ret = filemap_write_and_wait_range(inode->i_mapping, off,
562 off + len);
563 if (ret < 0)
564 return ret;
565
566 num_pages = calc_pages_for(off, len);
567 pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL);
568 if (IS_ERR(pages))
569 return PTR_ERR(pages);
570 ret = striped_read(inode, off, len, pages,
571 num_pages, checkeof);
572 if (ret > 0) {
573 int l, k = 0;
574 size_t left = ret;
575
576 while (left) {
577 size_t page_off = off & ~PAGE_MASK;
578 size_t copy = min_t(size_t, left,
579 PAGE_SIZE - page_off);
580 l = copy_page_to_iter(pages[k++], page_off, copy, i);
581 off += l;
582 left -= l;
583 if (l < copy)
584 break;
585 }
586 }
587 ceph_release_page_vector(pages, num_pages);
588
589 if (off > iocb->ki_pos) {
590 ret = off - iocb->ki_pos;
591 iocb->ki_pos = off;
592 }
593
594 dout("sync_read result %d\n", ret);
595 return ret;
596 }
597
598 struct ceph_aio_request {
599 struct kiocb *iocb;
600 size_t total_len;
601 int write;
602 int error;
603 struct list_head osd_reqs;
604 unsigned num_reqs;
605 atomic_t pending_reqs;
606 struct timespec mtime;
607 struct ceph_cap_flush *prealloc_cf;
608 };
609
610 struct ceph_aio_work {
611 struct work_struct work;
612 struct ceph_osd_request *req;
613 };
614
615 static void ceph_aio_retry_work(struct work_struct *work);
616
617 static void ceph_aio_complete(struct inode *inode,
618 struct ceph_aio_request *aio_req)
619 {
620 struct ceph_inode_info *ci = ceph_inode(inode);
621 int ret;
622
623 if (!atomic_dec_and_test(&aio_req->pending_reqs))
624 return;
625
626 ret = aio_req->error;
627 if (!ret)
628 ret = aio_req->total_len;
629
630 dout("ceph_aio_complete %p rc %d\n", inode, ret);
631
632 if (ret >= 0 && aio_req->write) {
633 int dirty;
634
635 loff_t endoff = aio_req->iocb->ki_pos + aio_req->total_len;
636 if (endoff > i_size_read(inode)) {
637 if (ceph_inode_set_size(inode, endoff))
638 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
639 }
640
641 spin_lock(&ci->i_ceph_lock);
642 ci->i_inline_version = CEPH_INLINE_NONE;
643 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
644 &aio_req->prealloc_cf);
645 spin_unlock(&ci->i_ceph_lock);
646 if (dirty)
647 __mark_inode_dirty(inode, dirty);
648
649 }
650
651 ceph_put_cap_refs(ci, (aio_req->write ? CEPH_CAP_FILE_WR :
652 CEPH_CAP_FILE_RD));
653
654 aio_req->iocb->ki_complete(aio_req->iocb, ret, 0);
655
656 ceph_free_cap_flush(aio_req->prealloc_cf);
657 kfree(aio_req);
658 }
659
660 static void ceph_aio_complete_req(struct ceph_osd_request *req)
661 {
662 int rc = req->r_result;
663 struct inode *inode = req->r_inode;
664 struct ceph_aio_request *aio_req = req->r_priv;
665 struct ceph_osd_data *osd_data = osd_req_op_extent_osd_data(req, 0);
666 int num_pages = calc_pages_for((u64)osd_data->alignment,
667 osd_data->length);
668
669 dout("ceph_aio_complete_req %p rc %d bytes %llu\n",
670 inode, rc, osd_data->length);
671
672 if (rc == -EOLDSNAPC) {
673 struct ceph_aio_work *aio_work;
674 BUG_ON(!aio_req->write);
675
676 aio_work = kmalloc(sizeof(*aio_work), GFP_NOFS);
677 if (aio_work) {
678 INIT_WORK(&aio_work->work, ceph_aio_retry_work);
679 aio_work->req = req;
680 queue_work(ceph_inode_to_client(inode)->wb_wq,
681 &aio_work->work);
682 return;
683 }
684 rc = -ENOMEM;
685 } else if (!aio_req->write) {
686 if (rc == -ENOENT)
687 rc = 0;
688 if (rc >= 0 && osd_data->length > rc) {
689 int zoff = osd_data->alignment + rc;
690 int zlen = osd_data->length - rc;
691 /*
692 * If read is satisfied by single OSD request,
693 * it can pass EOF. Otherwise read is within
694 * i_size.
695 */
696 if (aio_req->num_reqs == 1) {
697 loff_t i_size = i_size_read(inode);
698 loff_t endoff = aio_req->iocb->ki_pos + rc;
699 if (endoff < i_size)
700 zlen = min_t(size_t, zlen,
701 i_size - endoff);
702 aio_req->total_len = rc + zlen;
703 }
704
705 if (zlen > 0)
706 ceph_zero_page_vector_range(zoff, zlen,
707 osd_data->pages);
708 }
709 }
710
711 ceph_put_page_vector(osd_data->pages, num_pages, false);
712 ceph_osdc_put_request(req);
713
714 if (rc < 0)
715 cmpxchg(&aio_req->error, 0, rc);
716
717 ceph_aio_complete(inode, aio_req);
718 return;
719 }
720
721 static void ceph_aio_retry_work(struct work_struct *work)
722 {
723 struct ceph_aio_work *aio_work =
724 container_of(work, struct ceph_aio_work, work);
725 struct ceph_osd_request *orig_req = aio_work->req;
726 struct ceph_aio_request *aio_req = orig_req->r_priv;
727 struct inode *inode = orig_req->r_inode;
728 struct ceph_inode_info *ci = ceph_inode(inode);
729 struct ceph_snap_context *snapc;
730 struct ceph_osd_request *req;
731 int ret;
732
733 spin_lock(&ci->i_ceph_lock);
734 if (__ceph_have_pending_cap_snap(ci)) {
735 struct ceph_cap_snap *capsnap =
736 list_last_entry(&ci->i_cap_snaps,
737 struct ceph_cap_snap,
738 ci_item);
739 snapc = ceph_get_snap_context(capsnap->context);
740 } else {
741 BUG_ON(!ci->i_head_snapc);
742 snapc = ceph_get_snap_context(ci->i_head_snapc);
743 }
744 spin_unlock(&ci->i_ceph_lock);
745
746 req = ceph_osdc_alloc_request(orig_req->r_osdc, snapc, 2,
747 false, GFP_NOFS);
748 if (!req) {
749 ret = -ENOMEM;
750 req = orig_req;
751 goto out;
752 }
753
754 req->r_flags = CEPH_OSD_FLAG_ORDERSNAP |
755 CEPH_OSD_FLAG_ONDISK |
756 CEPH_OSD_FLAG_WRITE;
757 ceph_oloc_copy(&req->r_base_oloc, &orig_req->r_base_oloc);
758 ceph_oid_copy(&req->r_base_oid, &orig_req->r_base_oid);
759
760 ret = ceph_osdc_alloc_messages(req, GFP_NOFS);
761 if (ret) {
762 ceph_osdc_put_request(req);
763 req = orig_req;
764 goto out;
765 }
766
767 req->r_ops[0] = orig_req->r_ops[0];
768 osd_req_op_init(req, 1, CEPH_OSD_OP_STARTSYNC, 0);
769
770 req->r_mtime = aio_req->mtime;
771 req->r_data_offset = req->r_ops[0].extent.offset;
772
773 ceph_osdc_put_request(orig_req);
774
775 req->r_callback = ceph_aio_complete_req;
776 req->r_inode = inode;
777 req->r_priv = aio_req;
778
779 ret = ceph_osdc_start_request(req->r_osdc, req, false);
780 out:
781 if (ret < 0) {
782 req->r_result = ret;
783 ceph_aio_complete_req(req);
784 }
785
786 ceph_put_snap_context(snapc);
787 kfree(aio_work);
788 }
789
790 /*
791 * Write commit request unsafe callback, called to tell us when a
792 * request is unsafe (that is, in flight--has been handed to the
793 * messenger to send to its target osd). It is called again when
794 * we've received a response message indicating the request is
795 * "safe" (its CEPH_OSD_FLAG_ONDISK flag is set), or when a request
796 * is completed early (and unsuccessfully) due to a timeout or
797 * interrupt.
798 *
799 * This is used if we requested both an ACK and ONDISK commit reply
800 * from the OSD.
801 */
802 static void ceph_sync_write_unsafe(struct ceph_osd_request *req, bool unsafe)
803 {
804 struct ceph_inode_info *ci = ceph_inode(req->r_inode);
805
806 dout("%s %p tid %llu %ssafe\n", __func__, req, req->r_tid,
807 unsafe ? "un" : "");
808 if (unsafe) {
809 ceph_get_cap_refs(ci, CEPH_CAP_FILE_WR);
810 spin_lock(&ci->i_unsafe_lock);
811 list_add_tail(&req->r_unsafe_item,
812 &ci->i_unsafe_writes);
813 spin_unlock(&ci->i_unsafe_lock);
814
815 complete_all(&req->r_completion);
816 } else {
817 spin_lock(&ci->i_unsafe_lock);
818 list_del_init(&req->r_unsafe_item);
819 spin_unlock(&ci->i_unsafe_lock);
820 ceph_put_cap_refs(ci, CEPH_CAP_FILE_WR);
821 }
822 }
823
824
825 static ssize_t
826 ceph_direct_read_write(struct kiocb *iocb, struct iov_iter *iter,
827 struct ceph_snap_context *snapc,
828 struct ceph_cap_flush **pcf)
829 {
830 struct file *file = iocb->ki_filp;
831 struct inode *inode = file_inode(file);
832 struct ceph_inode_info *ci = ceph_inode(inode);
833 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
834 struct ceph_vino vino;
835 struct ceph_osd_request *req;
836 struct page **pages;
837 struct ceph_aio_request *aio_req = NULL;
838 int num_pages = 0;
839 int flags;
840 int ret;
841 struct timespec mtime = current_fs_time(inode->i_sb);
842 size_t count = iov_iter_count(iter);
843 loff_t pos = iocb->ki_pos;
844 bool write = iov_iter_rw(iter) == WRITE;
845
846 if (write && ceph_snap(file_inode(file)) != CEPH_NOSNAP)
847 return -EROFS;
848
849 dout("sync_direct_read_write (%s) on file %p %lld~%u\n",
850 (write ? "write" : "read"), file, pos, (unsigned)count);
851
852 ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + count);
853 if (ret < 0)
854 return ret;
855
856 if (write) {
857 ret = invalidate_inode_pages2_range(inode->i_mapping,
858 pos >> PAGE_SHIFT,
859 (pos + count) >> PAGE_SHIFT);
860 if (ret < 0)
861 dout("invalidate_inode_pages2_range returned %d\n", ret);
862
863 flags = CEPH_OSD_FLAG_ORDERSNAP |
864 CEPH_OSD_FLAG_ONDISK |
865 CEPH_OSD_FLAG_WRITE;
866 } else {
867 flags = CEPH_OSD_FLAG_READ;
868 }
869
870 while (iov_iter_count(iter) > 0) {
871 u64 size = dio_get_pagev_size(iter);
872 size_t start = 0;
873 ssize_t len;
874
875 vino = ceph_vino(inode);
876 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
877 vino, pos, &size, 0,
878 /*include a 'startsync' command*/
879 write ? 2 : 1,
880 write ? CEPH_OSD_OP_WRITE :
881 CEPH_OSD_OP_READ,
882 flags, snapc,
883 ci->i_truncate_seq,
884 ci->i_truncate_size,
885 false);
886 if (IS_ERR(req)) {
887 ret = PTR_ERR(req);
888 break;
889 }
890
891 len = size;
892 pages = dio_get_pages_alloc(iter, len, &start, &num_pages);
893 if (IS_ERR(pages)) {
894 ceph_osdc_put_request(req);
895 ret = PTR_ERR(pages);
896 break;
897 }
898
899 /*
900 * To simplify error handling, allow AIO when IO within i_size
901 * or IO can be satisfied by single OSD request.
902 */
903 if (pos == iocb->ki_pos && !is_sync_kiocb(iocb) &&
904 (len == count || pos + count <= i_size_read(inode))) {
905 aio_req = kzalloc(sizeof(*aio_req), GFP_KERNEL);
906 if (aio_req) {
907 aio_req->iocb = iocb;
908 aio_req->write = write;
909 INIT_LIST_HEAD(&aio_req->osd_reqs);
910 if (write) {
911 aio_req->mtime = mtime;
912 swap(aio_req->prealloc_cf, *pcf);
913 }
914 }
915 /* ignore error */
916 }
917
918 if (write) {
919 /*
920 * throw out any page cache pages in this range. this
921 * may block.
922 */
923 truncate_inode_pages_range(inode->i_mapping, pos,
924 (pos+len) | (PAGE_SIZE - 1));
925
926 osd_req_op_init(req, 1, CEPH_OSD_OP_STARTSYNC, 0);
927 req->r_mtime = mtime;
928 }
929
930 osd_req_op_extent_osd_data_pages(req, 0, pages, len, start,
931 false, false);
932
933 if (aio_req) {
934 aio_req->total_len += len;
935 aio_req->num_reqs++;
936 atomic_inc(&aio_req->pending_reqs);
937
938 req->r_callback = ceph_aio_complete_req;
939 req->r_inode = inode;
940 req->r_priv = aio_req;
941 list_add_tail(&req->r_unsafe_item, &aio_req->osd_reqs);
942
943 pos += len;
944 iov_iter_advance(iter, len);
945 continue;
946 }
947
948 ret = ceph_osdc_start_request(req->r_osdc, req, false);
949 if (!ret)
950 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
951
952 size = i_size_read(inode);
953 if (!write) {
954 if (ret == -ENOENT)
955 ret = 0;
956 if (ret >= 0 && ret < len && pos + ret < size) {
957 int zlen = min_t(size_t, len - ret,
958 size - pos - ret);
959 ceph_zero_page_vector_range(start + ret, zlen,
960 pages);
961 ret += zlen;
962 }
963 if (ret >= 0)
964 len = ret;
965 }
966
967 ceph_put_page_vector(pages, num_pages, false);
968
969 ceph_osdc_put_request(req);
970 if (ret < 0)
971 break;
972
973 pos += len;
974 iov_iter_advance(iter, len);
975
976 if (!write && pos >= size)
977 break;
978
979 if (write && pos > size) {
980 if (ceph_inode_set_size(inode, pos))
981 ceph_check_caps(ceph_inode(inode),
982 CHECK_CAPS_AUTHONLY,
983 NULL);
984 }
985 }
986
987 if (aio_req) {
988 if (aio_req->num_reqs == 0) {
989 kfree(aio_req);
990 return ret;
991 }
992
993 ceph_get_cap_refs(ci, write ? CEPH_CAP_FILE_WR :
994 CEPH_CAP_FILE_RD);
995
996 while (!list_empty(&aio_req->osd_reqs)) {
997 req = list_first_entry(&aio_req->osd_reqs,
998 struct ceph_osd_request,
999 r_unsafe_item);
1000 list_del_init(&req->r_unsafe_item);
1001 if (ret >= 0)
1002 ret = ceph_osdc_start_request(req->r_osdc,
1003 req, false);
1004 if (ret < 0) {
1005 req->r_result = ret;
1006 ceph_aio_complete_req(req);
1007 }
1008 }
1009 return -EIOCBQUEUED;
1010 }
1011
1012 if (ret != -EOLDSNAPC && pos > iocb->ki_pos) {
1013 ret = pos - iocb->ki_pos;
1014 iocb->ki_pos = pos;
1015 }
1016 return ret;
1017 }
1018
1019 /*
1020 * Synchronous write, straight from __user pointer or user pages.
1021 *
1022 * If write spans object boundary, just do multiple writes. (For a
1023 * correct atomic write, we should e.g. take write locks on all
1024 * objects, rollback on failure, etc.)
1025 */
1026 static ssize_t
1027 ceph_sync_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos,
1028 struct ceph_snap_context *snapc)
1029 {
1030 struct file *file = iocb->ki_filp;
1031 struct inode *inode = file_inode(file);
1032 struct ceph_inode_info *ci = ceph_inode(inode);
1033 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1034 struct ceph_vino vino;
1035 struct ceph_osd_request *req;
1036 struct page **pages;
1037 u64 len;
1038 int num_pages;
1039 int written = 0;
1040 int flags;
1041 int check_caps = 0;
1042 int ret;
1043 struct timespec mtime = current_fs_time(inode->i_sb);
1044 size_t count = iov_iter_count(from);
1045
1046 if (ceph_snap(file_inode(file)) != CEPH_NOSNAP)
1047 return -EROFS;
1048
1049 dout("sync_write on file %p %lld~%u\n", file, pos, (unsigned)count);
1050
1051 ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + count);
1052 if (ret < 0)
1053 return ret;
1054
1055 ret = invalidate_inode_pages2_range(inode->i_mapping,
1056 pos >> PAGE_SHIFT,
1057 (pos + count) >> PAGE_SHIFT);
1058 if (ret < 0)
1059 dout("invalidate_inode_pages2_range returned %d\n", ret);
1060
1061 flags = CEPH_OSD_FLAG_ORDERSNAP |
1062 CEPH_OSD_FLAG_ONDISK |
1063 CEPH_OSD_FLAG_WRITE |
1064 CEPH_OSD_FLAG_ACK;
1065
1066 while ((len = iov_iter_count(from)) > 0) {
1067 size_t left;
1068 int n;
1069
1070 vino = ceph_vino(inode);
1071 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1072 vino, pos, &len, 0, 1,
1073 CEPH_OSD_OP_WRITE, flags, snapc,
1074 ci->i_truncate_seq,
1075 ci->i_truncate_size,
1076 false);
1077 if (IS_ERR(req)) {
1078 ret = PTR_ERR(req);
1079 break;
1080 }
1081
1082 /*
1083 * write from beginning of first page,
1084 * regardless of io alignment
1085 */
1086 num_pages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
1087
1088 pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL);
1089 if (IS_ERR(pages)) {
1090 ret = PTR_ERR(pages);
1091 goto out;
1092 }
1093
1094 left = len;
1095 for (n = 0; n < num_pages; n++) {
1096 size_t plen = min_t(size_t, left, PAGE_SIZE);
1097 ret = copy_page_from_iter(pages[n], 0, plen, from);
1098 if (ret != plen) {
1099 ret = -EFAULT;
1100 break;
1101 }
1102 left -= ret;
1103 }
1104
1105 if (ret < 0) {
1106 ceph_release_page_vector(pages, num_pages);
1107 goto out;
1108 }
1109
1110 /* get a second commit callback */
1111 req->r_unsafe_callback = ceph_sync_write_unsafe;
1112 req->r_inode = inode;
1113
1114 osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0,
1115 false, true);
1116
1117 req->r_mtime = mtime;
1118 ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
1119 if (!ret)
1120 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
1121
1122 out:
1123 ceph_osdc_put_request(req);
1124 if (ret == 0) {
1125 pos += len;
1126 written += len;
1127
1128 if (pos > i_size_read(inode)) {
1129 check_caps = ceph_inode_set_size(inode, pos);
1130 if (check_caps)
1131 ceph_check_caps(ceph_inode(inode),
1132 CHECK_CAPS_AUTHONLY,
1133 NULL);
1134 }
1135 } else
1136 break;
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
1202 ret = generic_file_read_iter(iocb, to);
1203 }
1204 dout("aio_read %p %llx.%llx dropping cap refs on %s = %d\n",
1205 inode, ceph_vinop(inode), ceph_cap_string(got), (int)ret);
1206 if (pinned_page) {
1207 put_page(pinned_page);
1208 pinned_page = NULL;
1209 }
1210 ceph_put_cap_refs(ci, got);
1211 if (retry_op > HAVE_RETRIED && ret >= 0) {
1212 int statret;
1213 struct page *page = NULL;
1214 loff_t i_size;
1215 if (retry_op == READ_INLINE) {
1216 page = __page_cache_alloc(GFP_KERNEL);
1217 if (!page)
1218 return -ENOMEM;
1219 }
1220
1221 statret = __ceph_do_getattr(inode, page,
1222 CEPH_STAT_CAP_INLINE_DATA, !!page);
1223 if (statret < 0) {
1224 __free_page(page);
1225 if (statret == -ENODATA) {
1226 BUG_ON(retry_op != READ_INLINE);
1227 goto again;
1228 }
1229 return statret;
1230 }
1231
1232 i_size = i_size_read(inode);
1233 if (retry_op == READ_INLINE) {
1234 BUG_ON(ret > 0 || read > 0);
1235 if (iocb->ki_pos < i_size &&
1236 iocb->ki_pos < PAGE_SIZE) {
1237 loff_t end = min_t(loff_t, i_size,
1238 iocb->ki_pos + len);
1239 end = min_t(loff_t, end, PAGE_SIZE);
1240 if (statret < end)
1241 zero_user_segment(page, statret, end);
1242 ret = copy_page_to_iter(page,
1243 iocb->ki_pos & ~PAGE_MASK,
1244 end - iocb->ki_pos, to);
1245 iocb->ki_pos += ret;
1246 read += ret;
1247 }
1248 if (iocb->ki_pos < i_size && read < len) {
1249 size_t zlen = min_t(size_t, len - read,
1250 i_size - iocb->ki_pos);
1251 ret = iov_iter_zero(zlen, to);
1252 iocb->ki_pos += ret;
1253 read += ret;
1254 }
1255 __free_pages(page, 0);
1256 return read;
1257 }
1258
1259 /* hit EOF or hole? */
1260 if (retry_op == CHECK_EOF && iocb->ki_pos < i_size &&
1261 ret < len) {
1262 dout("sync_read hit hole, ppos %lld < size %lld"
1263 ", reading more\n", iocb->ki_pos, i_size);
1264
1265 read += ret;
1266 len -= ret;
1267 retry_op = HAVE_RETRIED;
1268 goto again;
1269 }
1270 }
1271
1272 if (ret >= 0)
1273 ret += read;
1274
1275 return ret;
1276 }
1277
1278 /*
1279 * Take cap references to avoid releasing caps to MDS mid-write.
1280 *
1281 * If we are synchronous, and write with an old snap context, the OSD
1282 * may return EOLDSNAPC. In that case, retry the write.. _after_
1283 * dropping our cap refs and allowing the pending snap to logically
1284 * complete _before_ this write occurs.
1285 *
1286 * If we are near ENOSPC, write synchronously.
1287 */
1288 static ssize_t ceph_write_iter(struct kiocb *iocb, struct iov_iter *from)
1289 {
1290 struct file *file = iocb->ki_filp;
1291 struct ceph_file_info *fi = file->private_data;
1292 struct inode *inode = file_inode(file);
1293 struct ceph_inode_info *ci = ceph_inode(inode);
1294 struct ceph_osd_client *osdc =
1295 &ceph_sb_to_client(inode->i_sb)->client->osdc;
1296 struct ceph_cap_flush *prealloc_cf;
1297 ssize_t count, written = 0;
1298 int err, want, got;
1299 loff_t pos;
1300
1301 if (ceph_snap(inode) != CEPH_NOSNAP)
1302 return -EROFS;
1303
1304 prealloc_cf = ceph_alloc_cap_flush();
1305 if (!prealloc_cf)
1306 return -ENOMEM;
1307
1308 inode_lock(inode);
1309
1310 /* We can write back this queue in page reclaim */
1311 current->backing_dev_info = inode_to_bdi(inode);
1312
1313 if (iocb->ki_flags & IOCB_APPEND) {
1314 err = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false);
1315 if (err < 0)
1316 goto out;
1317 }
1318
1319 err = generic_write_checks(iocb, from);
1320 if (err <= 0)
1321 goto out;
1322
1323 pos = iocb->ki_pos;
1324 count = iov_iter_count(from);
1325 err = file_remove_privs(file);
1326 if (err)
1327 goto out;
1328
1329 err = file_update_time(file);
1330 if (err)
1331 goto out;
1332
1333 if (ci->i_inline_version != CEPH_INLINE_NONE) {
1334 err = ceph_uninline_data(file, NULL);
1335 if (err < 0)
1336 goto out;
1337 }
1338
1339 retry_snap:
1340 if (ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL)) {
1341 err = -ENOSPC;
1342 goto out;
1343 }
1344
1345 dout("aio_write %p %llx.%llx %llu~%zd getting caps. i_size %llu\n",
1346 inode, ceph_vinop(inode), pos, count, i_size_read(inode));
1347 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1348 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
1349 else
1350 want = CEPH_CAP_FILE_BUFFER;
1351 got = 0;
1352 err = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, pos + count,
1353 &got, NULL);
1354 if (err < 0)
1355 goto out;
1356
1357 dout("aio_write %p %llx.%llx %llu~%zd got cap refs on %s\n",
1358 inode, ceph_vinop(inode), pos, count, ceph_cap_string(got));
1359
1360 if ((got & (CEPH_CAP_FILE_BUFFER|CEPH_CAP_FILE_LAZYIO)) == 0 ||
1361 (iocb->ki_flags & IOCB_DIRECT) || (fi->flags & CEPH_F_SYNC)) {
1362 struct ceph_snap_context *snapc;
1363 struct iov_iter data;
1364 inode_unlock(inode);
1365
1366 spin_lock(&ci->i_ceph_lock);
1367 if (__ceph_have_pending_cap_snap(ci)) {
1368 struct ceph_cap_snap *capsnap =
1369 list_last_entry(&ci->i_cap_snaps,
1370 struct ceph_cap_snap,
1371 ci_item);
1372 snapc = ceph_get_snap_context(capsnap->context);
1373 } else {
1374 BUG_ON(!ci->i_head_snapc);
1375 snapc = ceph_get_snap_context(ci->i_head_snapc);
1376 }
1377 spin_unlock(&ci->i_ceph_lock);
1378
1379 /* we might need to revert back to that point */
1380 data = *from;
1381 if (iocb->ki_flags & IOCB_DIRECT)
1382 written = ceph_direct_read_write(iocb, &data, snapc,
1383 &prealloc_cf);
1384 else
1385 written = ceph_sync_write(iocb, &data, pos, snapc);
1386 if (written == -EOLDSNAPC) {
1387 dout("aio_write %p %llx.%llx %llu~%u"
1388 "got EOLDSNAPC, retrying\n",
1389 inode, ceph_vinop(inode),
1390 pos, (unsigned)count);
1391 inode_lock(inode);
1392 goto retry_snap;
1393 }
1394 if (written > 0)
1395 iov_iter_advance(from, written);
1396 ceph_put_snap_context(snapc);
1397 } else {
1398 /*
1399 * No need to acquire the i_truncate_mutex. Because
1400 * the MDS revokes Fwb caps before sending truncate
1401 * message to us. We can't get Fwb cap while there
1402 * are pending vmtruncate. So write and vmtruncate
1403 * can not run at the same time
1404 */
1405 written = generic_perform_write(file, from, pos);
1406 if (likely(written >= 0))
1407 iocb->ki_pos = pos + written;
1408 inode_unlock(inode);
1409 }
1410
1411 if (written >= 0) {
1412 int dirty;
1413 spin_lock(&ci->i_ceph_lock);
1414 ci->i_inline_version = CEPH_INLINE_NONE;
1415 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
1416 &prealloc_cf);
1417 spin_unlock(&ci->i_ceph_lock);
1418 if (dirty)
1419 __mark_inode_dirty(inode, dirty);
1420 }
1421
1422 dout("aio_write %p %llx.%llx %llu~%u dropping cap refs on %s\n",
1423 inode, ceph_vinop(inode), pos, (unsigned)count,
1424 ceph_cap_string(got));
1425 ceph_put_cap_refs(ci, got);
1426
1427 if (written >= 0) {
1428 if (ceph_osdmap_flag(osdc, CEPH_OSDMAP_NEARFULL))
1429 iocb->ki_flags |= IOCB_DSYNC;
1430
1431 written = generic_write_sync(iocb, written);
1432 }
1433
1434 goto out_unlocked;
1435
1436 out:
1437 inode_unlock(inode);
1438 out_unlocked:
1439 ceph_free_cap_flush(prealloc_cf);
1440 current->backing_dev_info = NULL;
1441 return written ? written : err;
1442 }
1443
1444 /*
1445 * llseek. be sure to verify file size on SEEK_END.
1446 */
1447 static loff_t ceph_llseek(struct file *file, loff_t offset, int whence)
1448 {
1449 struct inode *inode = file->f_mapping->host;
1450 loff_t i_size;
1451 int ret;
1452
1453 inode_lock(inode);
1454
1455 if (whence == SEEK_END || whence == SEEK_DATA || whence == SEEK_HOLE) {
1456 ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false);
1457 if (ret < 0) {
1458 offset = ret;
1459 goto out;
1460 }
1461 }
1462
1463 i_size = i_size_read(inode);
1464 switch (whence) {
1465 case SEEK_END:
1466 offset += i_size;
1467 break;
1468 case SEEK_CUR:
1469 /*
1470 * Here we special-case the lseek(fd, 0, SEEK_CUR)
1471 * position-querying operation. Avoid rewriting the "same"
1472 * f_pos value back to the file because a concurrent read(),
1473 * write() or lseek() might have altered it
1474 */
1475 if (offset == 0) {
1476 offset = file->f_pos;
1477 goto out;
1478 }
1479 offset += file->f_pos;
1480 break;
1481 case SEEK_DATA:
1482 if (offset >= i_size) {
1483 ret = -ENXIO;
1484 goto out;
1485 }
1486 break;
1487 case SEEK_HOLE:
1488 if (offset >= i_size) {
1489 ret = -ENXIO;
1490 goto out;
1491 }
1492 offset = i_size;
1493 break;
1494 }
1495
1496 offset = vfs_setpos(file, offset, inode->i_sb->s_maxbytes);
1497
1498 out:
1499 inode_unlock(inode);
1500 return offset;
1501 }
1502
1503 static inline void ceph_zero_partial_page(
1504 struct inode *inode, loff_t offset, unsigned size)
1505 {
1506 struct page *page;
1507 pgoff_t index = offset >> PAGE_SHIFT;
1508
1509 page = find_lock_page(inode->i_mapping, index);
1510 if (page) {
1511 wait_on_page_writeback(page);
1512 zero_user(page, offset & (PAGE_SIZE - 1), size);
1513 unlock_page(page);
1514 put_page(page);
1515 }
1516 }
1517
1518 static void ceph_zero_pagecache_range(struct inode *inode, loff_t offset,
1519 loff_t length)
1520 {
1521 loff_t nearly = round_up(offset, PAGE_SIZE);
1522 if (offset < nearly) {
1523 loff_t size = nearly - offset;
1524 if (length < size)
1525 size = length;
1526 ceph_zero_partial_page(inode, offset, size);
1527 offset += size;
1528 length -= size;
1529 }
1530 if (length >= PAGE_SIZE) {
1531 loff_t size = round_down(length, PAGE_SIZE);
1532 truncate_pagecache_range(inode, offset, offset + size - 1);
1533 offset += size;
1534 length -= size;
1535 }
1536 if (length)
1537 ceph_zero_partial_page(inode, offset, length);
1538 }
1539
1540 static int ceph_zero_partial_object(struct inode *inode,
1541 loff_t offset, loff_t *length)
1542 {
1543 struct ceph_inode_info *ci = ceph_inode(inode);
1544 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1545 struct ceph_osd_request *req;
1546 int ret = 0;
1547 loff_t zero = 0;
1548 int op;
1549
1550 if (!length) {
1551 op = offset ? CEPH_OSD_OP_DELETE : CEPH_OSD_OP_TRUNCATE;
1552 length = &zero;
1553 } else {
1554 op = CEPH_OSD_OP_ZERO;
1555 }
1556
1557 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1558 ceph_vino(inode),
1559 offset, length,
1560 0, 1, op,
1561 CEPH_OSD_FLAG_WRITE |
1562 CEPH_OSD_FLAG_ONDISK,
1563 NULL, 0, 0, false);
1564 if (IS_ERR(req)) {
1565 ret = PTR_ERR(req);
1566 goto out;
1567 }
1568
1569 req->r_mtime = inode->i_mtime;
1570 ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
1571 if (!ret) {
1572 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
1573 if (ret == -ENOENT)
1574 ret = 0;
1575 }
1576 ceph_osdc_put_request(req);
1577
1578 out:
1579 return ret;
1580 }
1581
1582 static int ceph_zero_objects(struct inode *inode, loff_t offset, loff_t length)
1583 {
1584 int ret = 0;
1585 struct ceph_inode_info *ci = ceph_inode(inode);
1586 s32 stripe_unit = ceph_file_layout_su(ci->i_layout);
1587 s32 stripe_count = ceph_file_layout_stripe_count(ci->i_layout);
1588 s32 object_size = ceph_file_layout_object_size(ci->i_layout);
1589 u64 object_set_size = object_size * stripe_count;
1590 u64 nearly, t;
1591
1592 /* round offset up to next period boundary */
1593 nearly = offset + object_set_size - 1;
1594 t = nearly;
1595 nearly -= do_div(t, object_set_size);
1596
1597 while (length && offset < nearly) {
1598 loff_t size = length;
1599 ret = ceph_zero_partial_object(inode, offset, &size);
1600 if (ret < 0)
1601 return ret;
1602 offset += size;
1603 length -= size;
1604 }
1605 while (length >= object_set_size) {
1606 int i;
1607 loff_t pos = offset;
1608 for (i = 0; i < stripe_count; ++i) {
1609 ret = ceph_zero_partial_object(inode, pos, NULL);
1610 if (ret < 0)
1611 return ret;
1612 pos += stripe_unit;
1613 }
1614 offset += object_set_size;
1615 length -= object_set_size;
1616 }
1617 while (length) {
1618 loff_t size = length;
1619 ret = ceph_zero_partial_object(inode, offset, &size);
1620 if (ret < 0)
1621 return ret;
1622 offset += size;
1623 length -= size;
1624 }
1625 return ret;
1626 }
1627
1628 static long ceph_fallocate(struct file *file, int mode,
1629 loff_t offset, loff_t length)
1630 {
1631 struct ceph_file_info *fi = file->private_data;
1632 struct inode *inode = file_inode(file);
1633 struct ceph_inode_info *ci = ceph_inode(inode);
1634 struct ceph_osd_client *osdc =
1635 &ceph_inode_to_client(inode)->client->osdc;
1636 struct ceph_cap_flush *prealloc_cf;
1637 int want, got = 0;
1638 int dirty;
1639 int ret = 0;
1640 loff_t endoff = 0;
1641 loff_t size;
1642
1643 if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
1644 return -EOPNOTSUPP;
1645
1646 if (!S_ISREG(inode->i_mode))
1647 return -EOPNOTSUPP;
1648
1649 prealloc_cf = ceph_alloc_cap_flush();
1650 if (!prealloc_cf)
1651 return -ENOMEM;
1652
1653 inode_lock(inode);
1654
1655 if (ceph_snap(inode) != CEPH_NOSNAP) {
1656 ret = -EROFS;
1657 goto unlock;
1658 }
1659
1660 if (ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL) &&
1661 !(mode & FALLOC_FL_PUNCH_HOLE)) {
1662 ret = -ENOSPC;
1663 goto unlock;
1664 }
1665
1666 if (ci->i_inline_version != CEPH_INLINE_NONE) {
1667 ret = ceph_uninline_data(file, NULL);
1668 if (ret < 0)
1669 goto unlock;
1670 }
1671
1672 size = i_size_read(inode);
1673 if (!(mode & FALLOC_FL_KEEP_SIZE))
1674 endoff = offset + length;
1675
1676 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1677 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
1678 else
1679 want = CEPH_CAP_FILE_BUFFER;
1680
1681 ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, endoff, &got, NULL);
1682 if (ret < 0)
1683 goto unlock;
1684
1685 if (mode & FALLOC_FL_PUNCH_HOLE) {
1686 if (offset < size)
1687 ceph_zero_pagecache_range(inode, offset, length);
1688 ret = ceph_zero_objects(inode, offset, length);
1689 } else if (endoff > size) {
1690 truncate_pagecache_range(inode, size, -1);
1691 if (ceph_inode_set_size(inode, endoff))
1692 ceph_check_caps(ceph_inode(inode),
1693 CHECK_CAPS_AUTHONLY, NULL);
1694 }
1695
1696 if (!ret) {
1697 spin_lock(&ci->i_ceph_lock);
1698 ci->i_inline_version = CEPH_INLINE_NONE;
1699 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
1700 &prealloc_cf);
1701 spin_unlock(&ci->i_ceph_lock);
1702 if (dirty)
1703 __mark_inode_dirty(inode, dirty);
1704 }
1705
1706 ceph_put_cap_refs(ci, got);
1707 unlock:
1708 inode_unlock(inode);
1709 ceph_free_cap_flush(prealloc_cf);
1710 return ret;
1711 }
1712
1713 const struct file_operations ceph_file_fops = {
1714 .open = ceph_open,
1715 .release = ceph_release,
1716 .llseek = ceph_llseek,
1717 .read_iter = ceph_read_iter,
1718 .write_iter = ceph_write_iter,
1719 .mmap = ceph_mmap,
1720 .fsync = ceph_fsync,
1721 .lock = ceph_lock,
1722 .flock = ceph_flock,
1723 .splice_read = generic_file_splice_read,
1724 .splice_write = iter_file_splice_write,
1725 .unlocked_ioctl = ceph_ioctl,
1726 .compat_ioctl = ceph_ioctl,
1727 .fallocate = ceph_fallocate,
1728 };
1729
Linux kernel - Deliverables
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