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x86/mm/pat: Don't report PAT on CPUs that don't support it
[linux/fpc-iii.git] / fs / ceph / file.c
blob26cc95421cca6e62ef10bfd32b18cf1e526b7c51
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, true);
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 if (flags & O_CREAT) {
355 err = ceph_pre_init_acls(dir, &mode, &acls);
356 if (err < 0)
357 return err;
358 }
359
360 /* do the open */
361 req = prepare_open_request(dir->i_sb, flags, mode);
362 if (IS_ERR(req)) {
363 err = PTR_ERR(req);
364 goto out_acl;
365 }
366 req->r_dentry = dget(dentry);
367 req->r_num_caps = 2;
368 if (flags & O_CREAT) {
369 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
370 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
371 if (acls.pagelist) {
372 req->r_pagelist = acls.pagelist;
373 acls.pagelist = NULL;
374 }
375 }
376
377 mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED;
378 if (ceph_security_xattr_wanted(dir))
379 mask |= CEPH_CAP_XATTR_SHARED;
380 req->r_args.open.mask = cpu_to_le32(mask);
381
382 req->r_parent = dir;
383 set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
384 err = ceph_mdsc_do_request(mdsc,
385 (flags & (O_CREAT|O_TRUNC)) ? dir : NULL,
386 req);
387 err = ceph_handle_snapdir(req, dentry, err);
388 if (err)
389 goto out_req;
390
391 if ((flags & O_CREAT) && !req->r_reply_info.head->is_dentry)
392 err = ceph_handle_notrace_create(dir, dentry);
393
394 if (d_in_lookup(dentry)) {
395 dn = ceph_finish_lookup(req, dentry, err);
396 if (IS_ERR(dn))
397 err = PTR_ERR(dn);
398 } else {
399 /* we were given a hashed negative dentry */
400 dn = NULL;
401 }
402 if (err)
403 goto out_req;
404 if (dn || d_really_is_negative(dentry) || d_is_symlink(dentry)) {
405 /* make vfs retry on splice, ENOENT, or symlink */
406 dout("atomic_open finish_no_open on dn %p\n", dn);
407 err = finish_no_open(file, dn);
408 } else {
409 dout("atomic_open finish_open on dn %p\n", dn);
410 if (req->r_op == CEPH_MDS_OP_CREATE && req->r_reply_info.has_create_ino) {
411 ceph_init_inode_acls(d_inode(dentry), &acls);
412 *opened |= FILE_CREATED;
413 }
414 err = finish_open(file, dentry, ceph_open, opened);
415 }
416 out_req:
417 if (!req->r_err && req->r_target_inode)
418 ceph_put_fmode(ceph_inode(req->r_target_inode), req->r_fmode);
419 ceph_mdsc_put_request(req);
420 out_acl:
421 ceph_release_acls_info(&acls);
422 dout("atomic_open result=%d\n", err);
423 return err;
424 }
425
426 int ceph_release(struct inode *inode, struct file *file)
427 {
428 struct ceph_inode_info *ci = ceph_inode(inode);
429 struct ceph_file_info *cf = file->private_data;
430
431 dout("release inode %p file %p\n", inode, file);
432 ceph_put_fmode(ci, cf->fmode);
433 if (cf->last_readdir)
434 ceph_mdsc_put_request(cf->last_readdir);
435 kfree(cf->last_name);
436 kfree(cf->dir_info);
437 kmem_cache_free(ceph_file_cachep, cf);
438
439 /* wake up anyone waiting for caps on this inode */
440 wake_up_all(&ci->i_cap_wq);
441 return 0;
442 }
443
444 enum {
445 HAVE_RETRIED = 1,
446 CHECK_EOF = 2,
447 READ_INLINE = 3,
448 };
449
450 /*
451 * Read a range of bytes striped over one or more objects. Iterate over
452 * objects we stripe over. (That's not atomic, but good enough for now.)
453 *
454 * If we get a short result from the OSD, check against i_size; we need to
455 * only return a short read to the caller if we hit EOF.
456 */
457 static int striped_read(struct inode *inode,
458 u64 pos, u64 len,
459 struct page **pages, int num_pages,
460 int page_align, int *checkeof)
461 {
462 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
463 struct ceph_inode_info *ci = ceph_inode(inode);
464 u64 this_len;
465 loff_t i_size;
466 int page_idx;
467 int ret, read = 0;
468 bool hit_stripe, was_short;
469
470 /*
471 * we may need to do multiple reads. not atomic, unfortunately.
472 */
473 more:
474 this_len = len;
475 page_idx = (page_align + read) >> PAGE_SHIFT;
476 ret = ceph_osdc_readpages(&fsc->client->osdc, ceph_vino(inode),
477 &ci->i_layout, pos, &this_len,
478 ci->i_truncate_seq, ci->i_truncate_size,
479 pages + page_idx, num_pages - page_idx,
480 ((page_align + read) & ~PAGE_MASK));
481 if (ret == -ENOENT)
482 ret = 0;
483 hit_stripe = this_len < len;
484 was_short = ret >= 0 && ret < this_len;
485 dout("striped_read %llu~%llu (read %u) got %d%s%s\n", pos, len, read,
486 ret, hit_stripe ? " HITSTRIPE" : "", was_short ? " SHORT" : "");
487
488 i_size = i_size_read(inode);
489 if (ret >= 0) {
490 if (was_short && (pos + ret < i_size)) {
491 int zlen = min(this_len - ret, i_size - pos - ret);
492 int zoff = page_align + read + ret;
493 dout(" zero gap %llu to %llu\n",
494 pos + ret, pos + ret + zlen);
495 ceph_zero_page_vector_range(zoff, zlen, pages);
496 ret += zlen;
497 }
498
499 read += ret;
500 pos += ret;
501 len -= ret;
502
503 /* hit stripe and need continue*/
504 if (len && hit_stripe && pos < i_size)
505 goto more;
506 }
507
508 if (read > 0) {
509 ret = read;
510 /* did we bounce off eof? */
511 if (pos + len > i_size)
512 *checkeof = CHECK_EOF;
513 }
514
515 dout("striped_read returns %d\n", ret);
516 return ret;
517 }
518
519 /*
520 * Completely synchronous read and write methods. Direct from __user
521 * buffer to osd, or directly to user pages (if O_DIRECT).
522 *
523 * If the read spans object boundary, just do multiple reads.
524 */
525 static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *to,
526 int *checkeof)
527 {
528 struct file *file = iocb->ki_filp;
529 struct inode *inode = file_inode(file);
530 struct page **pages;
531 u64 off = iocb->ki_pos;
532 int num_pages;
533 ssize_t ret;
534 size_t len = iov_iter_count(to);
535
536 dout("sync_read on file %p %llu~%u %s\n", file, off,
537 (unsigned)len,
538 (file->f_flags & O_DIRECT) ? "O_DIRECT" : "");
539
540 if (!len)
541 return 0;
542 /*
543 * flush any page cache pages in this range. this
544 * will make concurrent normal and sync io slow,
545 * but it will at least behave sensibly when they are
546 * in sequence.
547 */
548 ret = filemap_write_and_wait_range(inode->i_mapping, off,
549 off + len);
550 if (ret < 0)
551 return ret;
552
553 if (unlikely(to->type & ITER_PIPE)) {
554 size_t page_off;
555 ret = iov_iter_get_pages_alloc(to, &pages, len,
556 &page_off);
557 if (ret <= 0)
558 return -ENOMEM;
559 num_pages = DIV_ROUND_UP(ret + page_off, PAGE_SIZE);
560
561 ret = striped_read(inode, off, ret, pages, num_pages,
562 page_off, checkeof);
563 if (ret > 0) {
564 iov_iter_advance(to, ret);
565 off += ret;
566 } else {
567 iov_iter_advance(to, 0);
568 }
569 ceph_put_page_vector(pages, num_pages, false);
570 } else {
571 num_pages = calc_pages_for(off, len);
572 pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL);
573 if (IS_ERR(pages))
574 return PTR_ERR(pages);
575
576 ret = striped_read(inode, off, len, pages, num_pages,
577 (off & ~PAGE_MASK), checkeof);
578 if (ret > 0) {
579 int l, k = 0;
580 size_t left = ret;
581
582 while (left) {
583 size_t page_off = off & ~PAGE_MASK;
584 size_t copy = min_t(size_t, left,
585 PAGE_SIZE - page_off);
586 l = copy_page_to_iter(pages[k++], page_off,
587 copy, to);
588 off += l;
589 left -= l;
590 if (l < copy)
591 break;
592 }
593 }
594 ceph_release_page_vector(pages, num_pages);
595 }
596
597 if (off > iocb->ki_pos) {
598 ret = off - iocb->ki_pos;
599 iocb->ki_pos = off;
600 }
601
602 dout("sync_read result %zd\n", ret);
603 return ret;
604 }
605
606 struct ceph_aio_request {
607 struct kiocb *iocb;
608 size_t total_len;
609 int write;
610 int error;
611 struct list_head osd_reqs;
612 unsigned num_reqs;
613 atomic_t pending_reqs;
614 struct timespec mtime;
615 struct ceph_cap_flush *prealloc_cf;
616 };
617
618 struct ceph_aio_work {
619 struct work_struct work;
620 struct ceph_osd_request *req;
621 };
622
623 static void ceph_aio_retry_work(struct work_struct *work);
624
625 static void ceph_aio_complete(struct inode *inode,
626 struct ceph_aio_request *aio_req)
627 {
628 struct ceph_inode_info *ci = ceph_inode(inode);
629 int ret;
630
631 if (!atomic_dec_and_test(&aio_req->pending_reqs))
632 return;
633
634 ret = aio_req->error;
635 if (!ret)
636 ret = aio_req->total_len;
637
638 dout("ceph_aio_complete %p rc %d\n", inode, ret);
639
640 if (ret >= 0 && aio_req->write) {
641 int dirty;
642
643 loff_t endoff = aio_req->iocb->ki_pos + aio_req->total_len;
644 if (endoff > i_size_read(inode)) {
645 if (ceph_inode_set_size(inode, endoff))
646 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
647 }
648
649 spin_lock(&ci->i_ceph_lock);
650 ci->i_inline_version = CEPH_INLINE_NONE;
651 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
652 &aio_req->prealloc_cf);
653 spin_unlock(&ci->i_ceph_lock);
654 if (dirty)
655 __mark_inode_dirty(inode, dirty);
656
657 }
658
659 ceph_put_cap_refs(ci, (aio_req->write ? CEPH_CAP_FILE_WR :
660 CEPH_CAP_FILE_RD));
661
662 aio_req->iocb->ki_complete(aio_req->iocb, ret, 0);
663
664 ceph_free_cap_flush(aio_req->prealloc_cf);
665 kfree(aio_req);
666 }
667
668 static void ceph_aio_complete_req(struct ceph_osd_request *req)
669 {
670 int rc = req->r_result;
671 struct inode *inode = req->r_inode;
672 struct ceph_aio_request *aio_req = req->r_priv;
673 struct ceph_osd_data *osd_data = osd_req_op_extent_osd_data(req, 0);
674 int num_pages = calc_pages_for((u64)osd_data->alignment,
675 osd_data->length);
676
677 dout("ceph_aio_complete_req %p rc %d bytes %llu\n",
678 inode, rc, osd_data->length);
679
680 if (rc == -EOLDSNAPC) {
681 struct ceph_aio_work *aio_work;
682 BUG_ON(!aio_req->write);
683
684 aio_work = kmalloc(sizeof(*aio_work), GFP_NOFS);
685 if (aio_work) {
686 INIT_WORK(&aio_work->work, ceph_aio_retry_work);
687 aio_work->req = req;
688 queue_work(ceph_inode_to_client(inode)->wb_wq,
689 &aio_work->work);
690 return;
691 }
692 rc = -ENOMEM;
693 } else if (!aio_req->write) {
694 if (rc == -ENOENT)
695 rc = 0;
696 if (rc >= 0 && osd_data->length > rc) {
697 int zoff = osd_data->alignment + rc;
698 int zlen = osd_data->length - rc;
699 /*
700 * If read is satisfied by single OSD request,
701 * it can pass EOF. Otherwise read is within
702 * i_size.
703 */
704 if (aio_req->num_reqs == 1) {
705 loff_t i_size = i_size_read(inode);
706 loff_t endoff = aio_req->iocb->ki_pos + rc;
707 if (endoff < i_size)
708 zlen = min_t(size_t, zlen,
709 i_size - endoff);
710 aio_req->total_len = rc + zlen;
711 }
712
713 if (zlen > 0)
714 ceph_zero_page_vector_range(zoff, zlen,
715 osd_data->pages);
716 }
717 }
718
719 ceph_put_page_vector(osd_data->pages, num_pages, !aio_req->write);
720 ceph_osdc_put_request(req);
721
722 if (rc < 0)
723 cmpxchg(&aio_req->error, 0, rc);
724
725 ceph_aio_complete(inode, aio_req);
726 return;
727 }
728
729 static void ceph_aio_retry_work(struct work_struct *work)
730 {
731 struct ceph_aio_work *aio_work =
732 container_of(work, struct ceph_aio_work, work);
733 struct ceph_osd_request *orig_req = aio_work->req;
734 struct ceph_aio_request *aio_req = orig_req->r_priv;
735 struct inode *inode = orig_req->r_inode;
736 struct ceph_inode_info *ci = ceph_inode(inode);
737 struct ceph_snap_context *snapc;
738 struct ceph_osd_request *req;
739 int ret;
740
741 spin_lock(&ci->i_ceph_lock);
742 if (__ceph_have_pending_cap_snap(ci)) {
743 struct ceph_cap_snap *capsnap =
744 list_last_entry(&ci->i_cap_snaps,
745 struct ceph_cap_snap,
746 ci_item);
747 snapc = ceph_get_snap_context(capsnap->context);
748 } else {
749 BUG_ON(!ci->i_head_snapc);
750 snapc = ceph_get_snap_context(ci->i_head_snapc);
751 }
752 spin_unlock(&ci->i_ceph_lock);
753
754 req = ceph_osdc_alloc_request(orig_req->r_osdc, snapc, 2,
755 false, GFP_NOFS);
756 if (!req) {
757 ret = -ENOMEM;
758 req = orig_req;
759 goto out;
760 }
761
762 req->r_flags = CEPH_OSD_FLAG_ORDERSNAP | CEPH_OSD_FLAG_WRITE;
763 ceph_oloc_copy(&req->r_base_oloc, &orig_req->r_base_oloc);
764 ceph_oid_copy(&req->r_base_oid, &orig_req->r_base_oid);
765
766 ret = ceph_osdc_alloc_messages(req, GFP_NOFS);
767 if (ret) {
768 ceph_osdc_put_request(req);
769 req = orig_req;
770 goto out;
771 }
772
773 req->r_ops[0] = orig_req->r_ops[0];
774 osd_req_op_init(req, 1, CEPH_OSD_OP_STARTSYNC, 0);
775
776 req->r_mtime = aio_req->mtime;
777 req->r_data_offset = req->r_ops[0].extent.offset;
778
779 ceph_osdc_put_request(orig_req);
780
781 req->r_callback = ceph_aio_complete_req;
782 req->r_inode = inode;
783 req->r_priv = aio_req;
784
785 ret = ceph_osdc_start_request(req->r_osdc, req, false);
786 out:
787 if (ret < 0) {
788 req->r_result = ret;
789 ceph_aio_complete_req(req);
790 }
791
792 ceph_put_snap_context(snapc);
793 kfree(aio_work);
794 }
795
796 static ssize_t
797 ceph_direct_read_write(struct kiocb *iocb, struct iov_iter *iter,
798 struct ceph_snap_context *snapc,
799 struct ceph_cap_flush **pcf)
800 {
801 struct file *file = iocb->ki_filp;
802 struct inode *inode = file_inode(file);
803 struct ceph_inode_info *ci = ceph_inode(inode);
804 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
805 struct ceph_vino vino;
806 struct ceph_osd_request *req;
807 struct page **pages;
808 struct ceph_aio_request *aio_req = NULL;
809 int num_pages = 0;
810 int flags;
811 int ret;
812 struct timespec mtime = current_time(inode);
813 size_t count = iov_iter_count(iter);
814 loff_t pos = iocb->ki_pos;
815 bool write = iov_iter_rw(iter) == WRITE;
816
817 if (write && ceph_snap(file_inode(file)) != CEPH_NOSNAP)
818 return -EROFS;
819
820 dout("sync_direct_read_write (%s) on file %p %lld~%u\n",
821 (write ? "write" : "read"), file, pos, (unsigned)count);
822
823 ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + count);
824 if (ret < 0)
825 return ret;
826
827 if (write) {
828 int ret2 = invalidate_inode_pages2_range(inode->i_mapping,
829 pos >> PAGE_SHIFT,
830 (pos + count) >> PAGE_SHIFT);
831 if (ret2 < 0)
832 dout("invalidate_inode_pages2_range returned %d\n", ret2);
833
834 flags = CEPH_OSD_FLAG_ORDERSNAP | CEPH_OSD_FLAG_WRITE;
835 } else {
836 flags = CEPH_OSD_FLAG_READ;
837 }
838
839 while (iov_iter_count(iter) > 0) {
840 u64 size = dio_get_pagev_size(iter);
841 size_t start = 0;
842 ssize_t len;
843
844 vino = ceph_vino(inode);
845 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
846 vino, pos, &size, 0,
847 /*include a 'startsync' command*/
848 write ? 2 : 1,
849 write ? CEPH_OSD_OP_WRITE :
850 CEPH_OSD_OP_READ,
851 flags, snapc,
852 ci->i_truncate_seq,
853 ci->i_truncate_size,
854 false);
855 if (IS_ERR(req)) {
856 ret = PTR_ERR(req);
857 break;
858 }
859
860 len = size;
861 pages = dio_get_pages_alloc(iter, len, &start, &num_pages);
862 if (IS_ERR(pages)) {
863 ceph_osdc_put_request(req);
864 ret = PTR_ERR(pages);
865 break;
866 }
867
868 /*
869 * To simplify error handling, allow AIO when IO within i_size
870 * or IO can be satisfied by single OSD request.
871 */
872 if (pos == iocb->ki_pos && !is_sync_kiocb(iocb) &&
873 (len == count || pos + count <= i_size_read(inode))) {
874 aio_req = kzalloc(sizeof(*aio_req), GFP_KERNEL);
875 if (aio_req) {
876 aio_req->iocb = iocb;
877 aio_req->write = write;
878 INIT_LIST_HEAD(&aio_req->osd_reqs);
879 if (write) {
880 aio_req->mtime = mtime;
881 swap(aio_req->prealloc_cf, *pcf);
882 }
883 }
884 /* ignore error */
885 }
886
887 if (write) {
888 /*
889 * throw out any page cache pages in this range. this
890 * may block.
891 */
892 truncate_inode_pages_range(inode->i_mapping, pos,
893 (pos+len) | (PAGE_SIZE - 1));
894
895 osd_req_op_init(req, 1, CEPH_OSD_OP_STARTSYNC, 0);
896 req->r_mtime = mtime;
897 }
898
899 osd_req_op_extent_osd_data_pages(req, 0, pages, len, start,
900 false, false);
901
902 if (aio_req) {
903 aio_req->total_len += len;
904 aio_req->num_reqs++;
905 atomic_inc(&aio_req->pending_reqs);
906
907 req->r_callback = ceph_aio_complete_req;
908 req->r_inode = inode;
909 req->r_priv = aio_req;
910 list_add_tail(&req->r_unsafe_item, &aio_req->osd_reqs);
911
912 pos += len;
913 iov_iter_advance(iter, len);
914 continue;
915 }
916
917 ret = ceph_osdc_start_request(req->r_osdc, req, false);
918 if (!ret)
919 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
920
921 size = i_size_read(inode);
922 if (!write) {
923 if (ret == -ENOENT)
924 ret = 0;
925 if (ret >= 0 && ret < len && pos + ret < size) {
926 int zlen = min_t(size_t, len - ret,
927 size - pos - ret);
928 ceph_zero_page_vector_range(start + ret, zlen,
929 pages);
930 ret += zlen;
931 }
932 if (ret >= 0)
933 len = ret;
934 }
935
936 ceph_put_page_vector(pages, num_pages, !write);
937
938 ceph_osdc_put_request(req);
939 if (ret < 0)
940 break;
941
942 pos += len;
943 iov_iter_advance(iter, len);
944
945 if (!write && pos >= size)
946 break;
947
948 if (write && pos > size) {
949 if (ceph_inode_set_size(inode, pos))
950 ceph_check_caps(ceph_inode(inode),
951 CHECK_CAPS_AUTHONLY,
952 NULL);
953 }
954 }
955
956 if (aio_req) {
957 LIST_HEAD(osd_reqs);
958
959 if (aio_req->num_reqs == 0) {
960 kfree(aio_req);
961 return ret;
962 }
963
964 ceph_get_cap_refs(ci, write ? CEPH_CAP_FILE_WR :
965 CEPH_CAP_FILE_RD);
966
967 list_splice(&aio_req->osd_reqs, &osd_reqs);
968 while (!list_empty(&osd_reqs)) {
969 req = list_first_entry(&osd_reqs,
970 struct ceph_osd_request,
971 r_unsafe_item);
972 list_del_init(&req->r_unsafe_item);
973 if (ret >= 0)
974 ret = ceph_osdc_start_request(req->r_osdc,
975 req, false);
976 if (ret < 0) {
977 req->r_result = ret;
978 ceph_aio_complete_req(req);
979 }
980 }
981 return -EIOCBQUEUED;
982 }
983
984 if (ret != -EOLDSNAPC && pos > iocb->ki_pos) {
985 ret = pos - iocb->ki_pos;
986 iocb->ki_pos = pos;
987 }
988 return ret;
989 }
990
991 /*
992 * Synchronous write, straight from __user pointer or user pages.
993 *
994 * If write spans object boundary, just do multiple writes. (For a
995 * correct atomic write, we should e.g. take write locks on all
996 * objects, rollback on failure, etc.)
997 */
998 static ssize_t
999 ceph_sync_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos,
1000 struct ceph_snap_context *snapc)
1001 {
1002 struct file *file = iocb->ki_filp;
1003 struct inode *inode = file_inode(file);
1004 struct ceph_inode_info *ci = ceph_inode(inode);
1005 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1006 struct ceph_vino vino;
1007 struct ceph_osd_request *req;
1008 struct page **pages;
1009 u64 len;
1010 int num_pages;
1011 int written = 0;
1012 int flags;
1013 int check_caps = 0;
1014 int ret;
1015 struct timespec mtime = current_time(inode);
1016 size_t count = iov_iter_count(from);
1017
1018 if (ceph_snap(file_inode(file)) != CEPH_NOSNAP)
1019 return -EROFS;
1020
1021 dout("sync_write on file %p %lld~%u\n", file, pos, (unsigned)count);
1022
1023 ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + count);
1024 if (ret < 0)
1025 return ret;
1026
1027 ret = invalidate_inode_pages2_range(inode->i_mapping,
1028 pos >> PAGE_SHIFT,
1029 (pos + count) >> PAGE_SHIFT);
1030 if (ret < 0)
1031 dout("invalidate_inode_pages2_range returned %d\n", ret);
1032
1033 flags = CEPH_OSD_FLAG_ORDERSNAP | CEPH_OSD_FLAG_WRITE;
1034
1035 while ((len = iov_iter_count(from)) > 0) {
1036 size_t left;
1037 int n;
1038
1039 vino = ceph_vino(inode);
1040 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1041 vino, pos, &len, 0, 1,
1042 CEPH_OSD_OP_WRITE, flags, snapc,
1043 ci->i_truncate_seq,
1044 ci->i_truncate_size,
1045 false);
1046 if (IS_ERR(req)) {
1047 ret = PTR_ERR(req);
1048 break;
1049 }
1050
1051 /*
1052 * write from beginning of first page,
1053 * regardless of io alignment
1054 */
1055 num_pages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
1056
1057 pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL);
1058 if (IS_ERR(pages)) {
1059 ret = PTR_ERR(pages);
1060 goto out;
1061 }
1062
1063 left = len;
1064 for (n = 0; n < num_pages; n++) {
1065 size_t plen = min_t(size_t, left, PAGE_SIZE);
1066 ret = copy_page_from_iter(pages[n], 0, plen, from);
1067 if (ret != plen) {
1068 ret = -EFAULT;
1069 break;
1070 }
1071 left -= ret;
1072 }
1073
1074 if (ret < 0) {
1075 ceph_release_page_vector(pages, num_pages);
1076 goto out;
1077 }
1078
1079 req->r_inode = inode;
1080
1081 osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0,
1082 false, true);
1083
1084 req->r_mtime = mtime;
1085 ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
1086 if (!ret)
1087 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
1088
1089 out:
1090 ceph_osdc_put_request(req);
1091 if (ret == 0) {
1092 pos += len;
1093 written += len;
1094
1095 if (pos > i_size_read(inode)) {
1096 check_caps = ceph_inode_set_size(inode, pos);
1097 if (check_caps)
1098 ceph_check_caps(ceph_inode(inode),
1099 CHECK_CAPS_AUTHONLY,
1100 NULL);
1101 }
1102 } else
1103 break;
1104 }
1105
1106 if (ret != -EOLDSNAPC && written > 0) {
1107 ret = written;
1108 iocb->ki_pos = pos;
1109 }
1110 return ret;
1111 }
1112
1113 /*
1114 * Wrap generic_file_aio_read with checks for cap bits on the inode.
1115 * Atomically grab references, so that those bits are not released
1116 * back to the MDS mid-read.
1117 *
1118 * Hmm, the sync read case isn't actually async... should it be?
1119 */
1120 static ssize_t ceph_read_iter(struct kiocb *iocb, struct iov_iter *to)
1121 {
1122 struct file *filp = iocb->ki_filp;
1123 struct ceph_file_info *fi = filp->private_data;
1124 size_t len = iov_iter_count(to);
1125 struct inode *inode = file_inode(filp);
1126 struct ceph_inode_info *ci = ceph_inode(inode);
1127 struct page *pinned_page = NULL;
1128 ssize_t ret;
1129 int want, got = 0;
1130 int retry_op = 0, read = 0;
1131
1132 again:
1133 dout("aio_read %p %llx.%llx %llu~%u trying to get caps on %p\n",
1134 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len, inode);
1135
1136 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1137 want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
1138 else
1139 want = CEPH_CAP_FILE_CACHE;
1140 ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, -1, &got, &pinned_page);
1141 if (ret < 0)
1142 return ret;
1143
1144 if ((got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0 ||
1145 (iocb->ki_flags & IOCB_DIRECT) ||
1146 (fi->flags & CEPH_F_SYNC)) {
1147
1148 dout("aio_sync_read %p %llx.%llx %llu~%u got cap refs on %s\n",
1149 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
1150 ceph_cap_string(got));
1151
1152 if (ci->i_inline_version == CEPH_INLINE_NONE) {
1153 if (!retry_op && (iocb->ki_flags & IOCB_DIRECT)) {
1154 ret = ceph_direct_read_write(iocb, to,
1155 NULL, NULL);
1156 if (ret >= 0 && ret < len)
1157 retry_op = CHECK_EOF;
1158 } else {
1159 ret = ceph_sync_read(iocb, to, &retry_op);
1160 }
1161 } else {
1162 retry_op = READ_INLINE;
1163 }
1164 } else {
1165 dout("aio_read %p %llx.%llx %llu~%u got cap refs on %s\n",
1166 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
1167 ceph_cap_string(got));
1168 current->journal_info = filp;
1169 ret = generic_file_read_iter(iocb, to);
1170 current->journal_info = NULL;
1171 }
1172 dout("aio_read %p %llx.%llx dropping cap refs on %s = %d\n",
1173 inode, ceph_vinop(inode), ceph_cap_string(got), (int)ret);
1174 if (pinned_page) {
1175 put_page(pinned_page);
1176 pinned_page = NULL;
1177 }
1178 ceph_put_cap_refs(ci, got);
1179 if (retry_op > HAVE_RETRIED && ret >= 0) {
1180 int statret;
1181 struct page *page = NULL;
1182 loff_t i_size;
1183 if (retry_op == READ_INLINE) {
1184 page = __page_cache_alloc(GFP_KERNEL);
1185 if (!page)
1186 return -ENOMEM;
1187 }
1188
1189 statret = __ceph_do_getattr(inode, page,
1190 CEPH_STAT_CAP_INLINE_DATA, !!page);
1191 if (statret < 0) {
1192 if (page)
1193 __free_page(page);
1194 if (statret == -ENODATA) {
1195 BUG_ON(retry_op != READ_INLINE);
1196 goto again;
1197 }
1198 return statret;
1199 }
1200
1201 i_size = i_size_read(inode);
1202 if (retry_op == READ_INLINE) {
1203 BUG_ON(ret > 0 || read > 0);
1204 if (iocb->ki_pos < i_size &&
1205 iocb->ki_pos < PAGE_SIZE) {
1206 loff_t end = min_t(loff_t, i_size,
1207 iocb->ki_pos + len);
1208 end = min_t(loff_t, end, PAGE_SIZE);
1209 if (statret < end)
1210 zero_user_segment(page, statret, end);
1211 ret = copy_page_to_iter(page,
1212 iocb->ki_pos & ~PAGE_MASK,
1213 end - iocb->ki_pos, to);
1214 iocb->ki_pos += ret;
1215 read += ret;
1216 }
1217 if (iocb->ki_pos < i_size && read < len) {
1218 size_t zlen = min_t(size_t, len - read,
1219 i_size - iocb->ki_pos);
1220 ret = iov_iter_zero(zlen, to);
1221 iocb->ki_pos += ret;
1222 read += ret;
1223 }
1224 __free_pages(page, 0);
1225 return read;
1226 }
1227
1228 /* hit EOF or hole? */
1229 if (retry_op == CHECK_EOF && iocb->ki_pos < i_size &&
1230 ret < len) {
1231 dout("sync_read hit hole, ppos %lld < size %lld"
1232 ", reading more\n", iocb->ki_pos, i_size);
1233
1234 read += ret;
1235 len -= ret;
1236 retry_op = HAVE_RETRIED;
1237 goto again;
1238 }
1239 }
1240
1241 if (ret >= 0)
1242 ret += read;
1243
1244 return ret;
1245 }
1246
1247 /*
1248 * Take cap references to avoid releasing caps to MDS mid-write.
1249 *
1250 * If we are synchronous, and write with an old snap context, the OSD
1251 * may return EOLDSNAPC. In that case, retry the write.. _after_
1252 * dropping our cap refs and allowing the pending snap to logically
1253 * complete _before_ this write occurs.
1254 *
1255 * If we are near ENOSPC, write synchronously.
1256 */
1257 static ssize_t ceph_write_iter(struct kiocb *iocb, struct iov_iter *from)
1258 {
1259 struct file *file = iocb->ki_filp;
1260 struct ceph_file_info *fi = file->private_data;
1261 struct inode *inode = file_inode(file);
1262 struct ceph_inode_info *ci = ceph_inode(inode);
1263 struct ceph_osd_client *osdc =
1264 &ceph_sb_to_client(inode->i_sb)->client->osdc;
1265 struct ceph_cap_flush *prealloc_cf;
1266 ssize_t count, written = 0;
1267 int err, want, got;
1268 loff_t pos;
1269
1270 if (ceph_snap(inode) != CEPH_NOSNAP)
1271 return -EROFS;
1272
1273 prealloc_cf = ceph_alloc_cap_flush();
1274 if (!prealloc_cf)
1275 return -ENOMEM;
1276
1277 inode_lock(inode);
1278
1279 /* We can write back this queue in page reclaim */
1280 current->backing_dev_info = inode_to_bdi(inode);
1281
1282 if (iocb->ki_flags & IOCB_APPEND) {
1283 err = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false);
1284 if (err < 0)
1285 goto out;
1286 }
1287
1288 err = generic_write_checks(iocb, from);
1289 if (err <= 0)
1290 goto out;
1291
1292 pos = iocb->ki_pos;
1293 count = iov_iter_count(from);
1294 err = file_remove_privs(file);
1295 if (err)
1296 goto out;
1297
1298 err = file_update_time(file);
1299 if (err)
1300 goto out;
1301
1302 if (ci->i_inline_version != CEPH_INLINE_NONE) {
1303 err = ceph_uninline_data(file, NULL);
1304 if (err < 0)
1305 goto out;
1306 }
1307
1308 retry_snap:
1309 if (ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL)) {
1310 err = -ENOSPC;
1311 goto out;
1312 }
1313
1314 dout("aio_write %p %llx.%llx %llu~%zd getting caps. i_size %llu\n",
1315 inode, ceph_vinop(inode), pos, count, i_size_read(inode));
1316 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1317 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
1318 else
1319 want = CEPH_CAP_FILE_BUFFER;
1320 got = 0;
1321 err = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, pos + count,
1322 &got, NULL);
1323 if (err < 0)
1324 goto out;
1325
1326 dout("aio_write %p %llx.%llx %llu~%zd got cap refs on %s\n",
1327 inode, ceph_vinop(inode), pos, count, ceph_cap_string(got));
1328
1329 if ((got & (CEPH_CAP_FILE_BUFFER|CEPH_CAP_FILE_LAZYIO)) == 0 ||
1330 (iocb->ki_flags & IOCB_DIRECT) || (fi->flags & CEPH_F_SYNC)) {
1331 struct ceph_snap_context *snapc;
1332 struct iov_iter data;
1333 inode_unlock(inode);
1334
1335 spin_lock(&ci->i_ceph_lock);
1336 if (__ceph_have_pending_cap_snap(ci)) {
1337 struct ceph_cap_snap *capsnap =
1338 list_last_entry(&ci->i_cap_snaps,
1339 struct ceph_cap_snap,
1340 ci_item);
1341 snapc = ceph_get_snap_context(capsnap->context);
1342 } else {
1343 BUG_ON(!ci->i_head_snapc);
1344 snapc = ceph_get_snap_context(ci->i_head_snapc);
1345 }
1346 spin_unlock(&ci->i_ceph_lock);
1347
1348 /* we might need to revert back to that point */
1349 data = *from;
1350 if (iocb->ki_flags & IOCB_DIRECT)
1351 written = ceph_direct_read_write(iocb, &data, snapc,
1352 &prealloc_cf);
1353 else
1354 written = ceph_sync_write(iocb, &data, pos, snapc);
1355 if (written == -EOLDSNAPC) {
1356 dout("aio_write %p %llx.%llx %llu~%u"
1357 "got EOLDSNAPC, retrying\n",
1358 inode, ceph_vinop(inode),
1359 pos, (unsigned)count);
1360 inode_lock(inode);
1361 goto retry_snap;
1362 }
1363 if (written > 0)
1364 iov_iter_advance(from, written);
1365 ceph_put_snap_context(snapc);
1366 } else {
1367 /*
1368 * No need to acquire the i_truncate_mutex. Because
1369 * the MDS revokes Fwb caps before sending truncate
1370 * message to us. We can't get Fwb cap while there
1371 * are pending vmtruncate. So write and vmtruncate
1372 * can not run at the same time
1373 */
1374 written = generic_perform_write(file, from, pos);
1375 if (likely(written >= 0))
1376 iocb->ki_pos = pos + written;
1377 inode_unlock(inode);
1378 }
1379
1380 if (written >= 0) {
1381 int dirty;
1382 spin_lock(&ci->i_ceph_lock);
1383 ci->i_inline_version = CEPH_INLINE_NONE;
1384 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
1385 &prealloc_cf);
1386 spin_unlock(&ci->i_ceph_lock);
1387 if (dirty)
1388 __mark_inode_dirty(inode, dirty);
1389 }
1390
1391 dout("aio_write %p %llx.%llx %llu~%u dropping cap refs on %s\n",
1392 inode, ceph_vinop(inode), pos, (unsigned)count,
1393 ceph_cap_string(got));
1394 ceph_put_cap_refs(ci, got);
1395
1396 if (written >= 0) {
1397 if (ceph_osdmap_flag(osdc, CEPH_OSDMAP_NEARFULL))
1398 iocb->ki_flags |= IOCB_DSYNC;
1399
1400 written = generic_write_sync(iocb, written);
1401 }
1402
1403 goto out_unlocked;
1404
1405 out:
1406 inode_unlock(inode);
1407 out_unlocked:
1408 ceph_free_cap_flush(prealloc_cf);
1409 current->backing_dev_info = NULL;
1410 return written ? written : err;
1411 }
1412
1413 /*
1414 * llseek. be sure to verify file size on SEEK_END.
1415 */
1416 static loff_t ceph_llseek(struct file *file, loff_t offset, int whence)
1417 {
1418 struct inode *inode = file->f_mapping->host;
1419 loff_t i_size;
1420 loff_t ret;
1421
1422 inode_lock(inode);
1423
1424 if (whence == SEEK_END || whence == SEEK_DATA || whence == SEEK_HOLE) {
1425 ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false);
1426 if (ret < 0)
1427 goto out;
1428 }
1429
1430 i_size = i_size_read(inode);
1431 switch (whence) {
1432 case SEEK_END:
1433 offset += i_size;
1434 break;
1435 case SEEK_CUR:
1436 /*
1437 * Here we special-case the lseek(fd, 0, SEEK_CUR)
1438 * position-querying operation. Avoid rewriting the "same"
1439 * f_pos value back to the file because a concurrent read(),
1440 * write() or lseek() might have altered it
1441 */
1442 if (offset == 0) {
1443 ret = file->f_pos;
1444 goto out;
1445 }
1446 offset += file->f_pos;
1447 break;
1448 case SEEK_DATA:
1449 if (offset >= i_size) {
1450 ret = -ENXIO;
1451 goto out;
1452 }
1453 break;
1454 case SEEK_HOLE:
1455 if (offset >= i_size) {
1456 ret = -ENXIO;
1457 goto out;
1458 }
1459 offset = i_size;
1460 break;
1461 }
1462
1463 ret = vfs_setpos(file, offset, inode->i_sb->s_maxbytes);
1464
1465 out:
1466 inode_unlock(inode);
1467 return ret;
1468 }
1469
1470 static inline void ceph_zero_partial_page(
1471 struct inode *inode, loff_t offset, unsigned size)
1472 {
1473 struct page *page;
1474 pgoff_t index = offset >> PAGE_SHIFT;
1475
1476 page = find_lock_page(inode->i_mapping, index);
1477 if (page) {
1478 wait_on_page_writeback(page);
1479 zero_user(page, offset & (PAGE_SIZE - 1), size);
1480 unlock_page(page);
1481 put_page(page);
1482 }
1483 }
1484
1485 static void ceph_zero_pagecache_range(struct inode *inode, loff_t offset,
1486 loff_t length)
1487 {
1488 loff_t nearly = round_up(offset, PAGE_SIZE);
1489 if (offset < nearly) {
1490 loff_t size = nearly - offset;
1491 if (length < size)
1492 size = length;
1493 ceph_zero_partial_page(inode, offset, size);
1494 offset += size;
1495 length -= size;
1496 }
1497 if (length >= PAGE_SIZE) {
1498 loff_t size = round_down(length, PAGE_SIZE);
1499 truncate_pagecache_range(inode, offset, offset + size - 1);
1500 offset += size;
1501 length -= size;
1502 }
1503 if (length)
1504 ceph_zero_partial_page(inode, offset, length);
1505 }
1506
1507 static int ceph_zero_partial_object(struct inode *inode,
1508 loff_t offset, loff_t *length)
1509 {
1510 struct ceph_inode_info *ci = ceph_inode(inode);
1511 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1512 struct ceph_osd_request *req;
1513 int ret = 0;
1514 loff_t zero = 0;
1515 int op;
1516
1517 if (!length) {
1518 op = offset ? CEPH_OSD_OP_DELETE : CEPH_OSD_OP_TRUNCATE;
1519 length = &zero;
1520 } else {
1521 op = CEPH_OSD_OP_ZERO;
1522 }
1523
1524 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1525 ceph_vino(inode),
1526 offset, length,
1527 0, 1, op,
1528 CEPH_OSD_FLAG_WRITE,
1529 NULL, 0, 0, false);
1530 if (IS_ERR(req)) {
1531 ret = PTR_ERR(req);
1532 goto out;
1533 }
1534
1535 req->r_mtime = inode->i_mtime;
1536 ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
1537 if (!ret) {
1538 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
1539 if (ret == -ENOENT)
1540 ret = 0;
1541 }
1542 ceph_osdc_put_request(req);
1543
1544 out:
1545 return ret;
1546 }
1547
1548 static int ceph_zero_objects(struct inode *inode, loff_t offset, loff_t length)
1549 {
1550 int ret = 0;
1551 struct ceph_inode_info *ci = ceph_inode(inode);
1552 s32 stripe_unit = ci->i_layout.stripe_unit;
1553 s32 stripe_count = ci->i_layout.stripe_count;
1554 s32 object_size = ci->i_layout.object_size;
1555 u64 object_set_size = object_size * stripe_count;
1556 u64 nearly, t;
1557
1558 /* round offset up to next period boundary */
1559 nearly = offset + object_set_size - 1;
1560 t = nearly;
1561 nearly -= do_div(t, object_set_size);
1562
1563 while (length && offset < nearly) {
1564 loff_t size = length;
1565 ret = ceph_zero_partial_object(inode, offset, &size);
1566 if (ret < 0)
1567 return ret;
1568 offset += size;
1569 length -= size;
1570 }
1571 while (length >= object_set_size) {
1572 int i;
1573 loff_t pos = offset;
1574 for (i = 0; i < stripe_count; ++i) {
1575 ret = ceph_zero_partial_object(inode, pos, NULL);
1576 if (ret < 0)
1577 return ret;
1578 pos += stripe_unit;
1579 }
1580 offset += object_set_size;
1581 length -= object_set_size;
1582 }
1583 while (length) {
1584 loff_t size = length;
1585 ret = ceph_zero_partial_object(inode, offset, &size);
1586 if (ret < 0)
1587 return ret;
1588 offset += size;
1589 length -= size;
1590 }
1591 return ret;
1592 }
1593
1594 static long ceph_fallocate(struct file *file, int mode,
1595 loff_t offset, loff_t length)
1596 {
1597 struct ceph_file_info *fi = file->private_data;
1598 struct inode *inode = file_inode(file);
1599 struct ceph_inode_info *ci = ceph_inode(inode);
1600 struct ceph_osd_client *osdc =
1601 &ceph_inode_to_client(inode)->client->osdc;
1602 struct ceph_cap_flush *prealloc_cf;
1603 int want, got = 0;
1604 int dirty;
1605 int ret = 0;
1606 loff_t endoff = 0;
1607 loff_t size;
1608
1609 if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
1610 return -EOPNOTSUPP;
1611
1612 if (!S_ISREG(inode->i_mode))
1613 return -EOPNOTSUPP;
1614
1615 prealloc_cf = ceph_alloc_cap_flush();
1616 if (!prealloc_cf)
1617 return -ENOMEM;
1618
1619 inode_lock(inode);
1620
1621 if (ceph_snap(inode) != CEPH_NOSNAP) {
1622 ret = -EROFS;
1623 goto unlock;
1624 }
1625
1626 if (ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL) &&
1627 !(mode & FALLOC_FL_PUNCH_HOLE)) {
1628 ret = -ENOSPC;
1629 goto unlock;
1630 }
1631
1632 if (ci->i_inline_version != CEPH_INLINE_NONE) {
1633 ret = ceph_uninline_data(file, NULL);
1634 if (ret < 0)
1635 goto unlock;
1636 }
1637
1638 size = i_size_read(inode);
1639 if (!(mode & FALLOC_FL_KEEP_SIZE))
1640 endoff = offset + length;
1641
1642 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1643 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
1644 else
1645 want = CEPH_CAP_FILE_BUFFER;
1646
1647 ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, endoff, &got, NULL);
1648 if (ret < 0)
1649 goto unlock;
1650
1651 if (mode & FALLOC_FL_PUNCH_HOLE) {
1652 if (offset < size)
1653 ceph_zero_pagecache_range(inode, offset, length);
1654 ret = ceph_zero_objects(inode, offset, length);
1655 } else if (endoff > size) {
1656 truncate_pagecache_range(inode, size, -1);
1657 if (ceph_inode_set_size(inode, endoff))
1658 ceph_check_caps(ceph_inode(inode),
1659 CHECK_CAPS_AUTHONLY, NULL);
1660 }
1661
1662 if (!ret) {
1663 spin_lock(&ci->i_ceph_lock);
1664 ci->i_inline_version = CEPH_INLINE_NONE;
1665 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
1666 &prealloc_cf);
1667 spin_unlock(&ci->i_ceph_lock);
1668 if (dirty)
1669 __mark_inode_dirty(inode, dirty);
1670 }
1671
1672 ceph_put_cap_refs(ci, got);
1673 unlock:
1674 inode_unlock(inode);
1675 ceph_free_cap_flush(prealloc_cf);
1676 return ret;
1677 }
1678
1679 const struct file_operations ceph_file_fops = {
1680 .open = ceph_open,
1681 .release = ceph_release,
1682 .llseek = ceph_llseek,
1683 .read_iter = ceph_read_iter,
1684 .write_iter = ceph_write_iter,
1685 .mmap = ceph_mmap,
1686 .fsync = ceph_fsync,
1687 .lock = ceph_lock,
1688 .flock = ceph_flock,
1689 .splice_read = generic_file_splice_read,
1690 .splice_write = iter_file_splice_write,
1691 .unlocked_ioctl = ceph_ioctl,
1692 .compat_ioctl = ceph_ioctl,
1693 .fallocate = ceph_fallocate,
1694 };
1695
Linux with added FPC-III support