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Merge branch 'topic/zxdma' into for-linus
[linux/fpc-iii.git] / fs / ceph / file.c
blob8b79d87eaf4675ff91cf05c10a3fc53e70d5b313
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 /*
39 * Prepare an open request. Preallocate ceph_cap to avoid an
40 * inopportune ENOMEM later.
41 */
42 static struct ceph_mds_request *
43 prepare_open_request(struct super_block *sb, int flags, int create_mode)
44 {
45 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
46 struct ceph_mds_client *mdsc = fsc->mdsc;
47 struct ceph_mds_request *req;
48 int want_auth = USE_ANY_MDS;
49 int op = (flags & O_CREAT) ? CEPH_MDS_OP_CREATE : CEPH_MDS_OP_OPEN;
50
51 if (flags & (O_WRONLY|O_RDWR|O_CREAT|O_TRUNC))
52 want_auth = USE_AUTH_MDS;
53
54 req = ceph_mdsc_create_request(mdsc, op, want_auth);
55 if (IS_ERR(req))
56 goto out;
57 req->r_fmode = ceph_flags_to_mode(flags);
58 req->r_args.open.flags = cpu_to_le32(flags);
59 req->r_args.open.mode = cpu_to_le32(create_mode);
60 out:
61 return req;
62 }
63
64 /*
65 * initialize private struct file data.
66 * if we fail, clean up by dropping fmode reference on the ceph_inode
67 */
68 static int ceph_init_file(struct inode *inode, struct file *file, int fmode)
69 {
70 struct ceph_file_info *cf;
71 int ret = 0;
72 struct ceph_inode_info *ci = ceph_inode(inode);
73 struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
74 struct ceph_mds_client *mdsc = fsc->mdsc;
75
76 switch (inode->i_mode & S_IFMT) {
77 case S_IFREG:
78 /* First file open request creates the cookie, we want to keep
79 * this cookie around for the filetime of the inode as not to
80 * have to worry about fscache register / revoke / operation
81 * races.
82 *
83 * Also, if we know the operation is going to invalidate data
84 * (non readonly) just nuke the cache right away.
85 */
86 ceph_fscache_register_inode_cookie(mdsc->fsc, ci);
87 if ((fmode & CEPH_FILE_MODE_WR))
88 ceph_fscache_invalidate(inode);
89 case S_IFDIR:
90 dout("init_file %p %p 0%o (regular)\n", inode, file,
91 inode->i_mode);
92 cf = kmem_cache_alloc(ceph_file_cachep, GFP_KERNEL | __GFP_ZERO);
93 if (cf == NULL) {
94 ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */
95 return -ENOMEM;
96 }
97 cf->fmode = fmode;
98 cf->next_offset = 2;
99 cf->readdir_cache_idx = -1;
100 file->private_data = cf;
101 BUG_ON(inode->i_fop->release != ceph_release);
102 break;
103
104 case S_IFLNK:
105 dout("init_file %p %p 0%o (symlink)\n", inode, file,
106 inode->i_mode);
107 ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */
108 break;
109
110 default:
111 dout("init_file %p %p 0%o (special)\n", inode, file,
112 inode->i_mode);
113 /*
114 * we need to drop the open ref now, since we don't
115 * have .release set to ceph_release.
116 */
117 ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */
118 BUG_ON(inode->i_fop->release == ceph_release);
119
120 /* call the proper open fop */
121 ret = inode->i_fop->open(inode, file);
122 }
123 return ret;
124 }
125
126 /*
127 * If we already have the requisite capabilities, we can satisfy
128 * the open request locally (no need to request new caps from the
129 * MDS). We do, however, need to inform the MDS (asynchronously)
130 * if our wanted caps set expands.
131 */
132 int ceph_open(struct inode *inode, struct file *file)
133 {
134 struct ceph_inode_info *ci = ceph_inode(inode);
135 struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
136 struct ceph_mds_client *mdsc = fsc->mdsc;
137 struct ceph_mds_request *req;
138 struct ceph_file_info *cf = file->private_data;
139 struct inode *parent_inode = NULL;
140 int err;
141 int flags, fmode, wanted;
142
143 if (cf) {
144 dout("open file %p is already opened\n", file);
145 return 0;
146 }
147
148 /* filter out O_CREAT|O_EXCL; vfs did that already. yuck. */
149 flags = file->f_flags & ~(O_CREAT|O_EXCL);
150 if (S_ISDIR(inode->i_mode))
151 flags = O_DIRECTORY; /* mds likes to know */
152
153 dout("open inode %p ino %llx.%llx file %p flags %d (%d)\n", inode,
154 ceph_vinop(inode), file, flags, file->f_flags);
155 fmode = ceph_flags_to_mode(flags);
156 wanted = ceph_caps_for_mode(fmode);
157
158 /* snapped files are read-only */
159 if (ceph_snap(inode) != CEPH_NOSNAP && (file->f_mode & FMODE_WRITE))
160 return -EROFS;
161
162 /* trivially open snapdir */
163 if (ceph_snap(inode) == CEPH_SNAPDIR) {
164 spin_lock(&ci->i_ceph_lock);
165 __ceph_get_fmode(ci, fmode);
166 spin_unlock(&ci->i_ceph_lock);
167 return ceph_init_file(inode, file, fmode);
168 }
169
170 /*
171 * No need to block if we have caps on the auth MDS (for
172 * write) or any MDS (for read). Update wanted set
173 * asynchronously.
174 */
175 spin_lock(&ci->i_ceph_lock);
176 if (__ceph_is_any_real_caps(ci) &&
177 (((fmode & CEPH_FILE_MODE_WR) == 0) || ci->i_auth_cap)) {
178 int mds_wanted = __ceph_caps_mds_wanted(ci);
179 int issued = __ceph_caps_issued(ci, NULL);
180
181 dout("open %p fmode %d want %s issued %s using existing\n",
182 inode, fmode, ceph_cap_string(wanted),
183 ceph_cap_string(issued));
184 __ceph_get_fmode(ci, fmode);
185 spin_unlock(&ci->i_ceph_lock);
186
187 /* adjust wanted? */
188 if ((issued & wanted) != wanted &&
189 (mds_wanted & wanted) != wanted &&
190 ceph_snap(inode) != CEPH_SNAPDIR)
191 ceph_check_caps(ci, 0, NULL);
192
193 return ceph_init_file(inode, file, fmode);
194 } else if (ceph_snap(inode) != CEPH_NOSNAP &&
195 (ci->i_snap_caps & wanted) == wanted) {
196 __ceph_get_fmode(ci, fmode);
197 spin_unlock(&ci->i_ceph_lock);
198 return ceph_init_file(inode, file, fmode);
199 }
200
201 spin_unlock(&ci->i_ceph_lock);
202
203 dout("open fmode %d wants %s\n", fmode, ceph_cap_string(wanted));
204 req = prepare_open_request(inode->i_sb, flags, 0);
205 if (IS_ERR(req)) {
206 err = PTR_ERR(req);
207 goto out;
208 }
209 req->r_inode = inode;
210 ihold(inode);
211
212 req->r_num_caps = 1;
213 if (flags & O_CREAT)
214 parent_inode = ceph_get_dentry_parent_inode(file->f_path.dentry);
215 err = ceph_mdsc_do_request(mdsc, parent_inode, req);
216 iput(parent_inode);
217 if (!err)
218 err = ceph_init_file(inode, file, req->r_fmode);
219 ceph_mdsc_put_request(req);
220 dout("open result=%d on %llx.%llx\n", err, ceph_vinop(inode));
221 out:
222 return err;
223 }
224
225
226 /*
227 * Do a lookup + open with a single request. If we get a non-existent
228 * file or symlink, return 1 so the VFS can retry.
229 */
230 int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
231 struct file *file, unsigned flags, umode_t mode,
232 int *opened)
233 {
234 struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
235 struct ceph_mds_client *mdsc = fsc->mdsc;
236 struct ceph_mds_request *req;
237 struct dentry *dn;
238 struct ceph_acls_info acls = {};
239 int err;
240
241 dout("atomic_open %p dentry %p '%pd' %s flags %d mode 0%o\n",
242 dir, dentry, dentry,
243 d_unhashed(dentry) ? "unhashed" : "hashed", flags, mode);
244
245 if (dentry->d_name.len > NAME_MAX)
246 return -ENAMETOOLONG;
247
248 err = ceph_init_dentry(dentry);
249 if (err < 0)
250 return err;
251
252 if (flags & O_CREAT) {
253 err = ceph_pre_init_acls(dir, &mode, &acls);
254 if (err < 0)
255 return err;
256 }
257
258 /* do the open */
259 req = prepare_open_request(dir->i_sb, flags, mode);
260 if (IS_ERR(req)) {
261 err = PTR_ERR(req);
262 goto out_acl;
263 }
264 req->r_dentry = dget(dentry);
265 req->r_num_caps = 2;
266 if (flags & O_CREAT) {
267 req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
268 req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
269 if (acls.pagelist) {
270 req->r_pagelist = acls.pagelist;
271 acls.pagelist = NULL;
272 }
273 }
274 req->r_locked_dir = dir; /* caller holds dir->i_mutex */
275 err = ceph_mdsc_do_request(mdsc,
276 (flags & (O_CREAT|O_TRUNC)) ? dir : NULL,
277 req);
278 err = ceph_handle_snapdir(req, dentry, err);
279 if (err)
280 goto out_req;
281
282 if (err == 0 && (flags & O_CREAT) && !req->r_reply_info.head->is_dentry)
283 err = ceph_handle_notrace_create(dir, dentry);
284
285 if (d_unhashed(dentry)) {
286 dn = ceph_finish_lookup(req, dentry, err);
287 if (IS_ERR(dn))
288 err = PTR_ERR(dn);
289 } else {
290 /* we were given a hashed negative dentry */
291 dn = NULL;
292 }
293 if (err)
294 goto out_req;
295 if (dn || d_really_is_negative(dentry) || d_is_symlink(dentry)) {
296 /* make vfs retry on splice, ENOENT, or symlink */
297 dout("atomic_open finish_no_open on dn %p\n", dn);
298 err = finish_no_open(file, dn);
299 } else {
300 dout("atomic_open finish_open on dn %p\n", dn);
301 if (req->r_op == CEPH_MDS_OP_CREATE && req->r_reply_info.has_create_ino) {
302 ceph_init_inode_acls(d_inode(dentry), &acls);
303 *opened |= FILE_CREATED;
304 }
305 err = finish_open(file, dentry, ceph_open, opened);
306 }
307 out_req:
308 if (!req->r_err && req->r_target_inode)
309 ceph_put_fmode(ceph_inode(req->r_target_inode), req->r_fmode);
310 ceph_mdsc_put_request(req);
311 out_acl:
312 ceph_release_acls_info(&acls);
313 dout("atomic_open result=%d\n", err);
314 return err;
315 }
316
317 int ceph_release(struct inode *inode, struct file *file)
318 {
319 struct ceph_inode_info *ci = ceph_inode(inode);
320 struct ceph_file_info *cf = file->private_data;
321
322 dout("release inode %p file %p\n", inode, file);
323 ceph_put_fmode(ci, cf->fmode);
324 if (cf->last_readdir)
325 ceph_mdsc_put_request(cf->last_readdir);
326 kfree(cf->last_name);
327 kfree(cf->dir_info);
328 kmem_cache_free(ceph_file_cachep, cf);
329
330 /* wake up anyone waiting for caps on this inode */
331 wake_up_all(&ci->i_cap_wq);
332 return 0;
333 }
334
335 enum {
336 CHECK_EOF = 1,
337 READ_INLINE = 2,
338 };
339
340 /*
341 * Read a range of bytes striped over one or more objects. Iterate over
342 * objects we stripe over. (That's not atomic, but good enough for now.)
343 *
344 * If we get a short result from the OSD, check against i_size; we need to
345 * only return a short read to the caller if we hit EOF.
346 */
347 static int striped_read(struct inode *inode,
348 u64 off, u64 len,
349 struct page **pages, int num_pages,
350 int *checkeof, bool o_direct,
351 unsigned long buf_align)
352 {
353 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
354 struct ceph_inode_info *ci = ceph_inode(inode);
355 u64 pos, this_len, left;
356 int io_align, page_align;
357 int pages_left;
358 int read;
359 struct page **page_pos;
360 int ret;
361 bool hit_stripe, was_short;
362
363 /*
364 * we may need to do multiple reads. not atomic, unfortunately.
365 */
366 pos = off;
367 left = len;
368 page_pos = pages;
369 pages_left = num_pages;
370 read = 0;
371 io_align = off & ~PAGE_MASK;
372
373 more:
374 if (o_direct)
375 page_align = (pos - io_align + buf_align) & ~PAGE_MASK;
376 else
377 page_align = pos & ~PAGE_MASK;
378 this_len = left;
379 ret = ceph_osdc_readpages(&fsc->client->osdc, ceph_vino(inode),
380 &ci->i_layout, pos, &this_len,
381 ci->i_truncate_seq,
382 ci->i_truncate_size,
383 page_pos, pages_left, page_align);
384 if (ret == -ENOENT)
385 ret = 0;
386 hit_stripe = this_len < left;
387 was_short = ret >= 0 && ret < this_len;
388 dout("striped_read %llu~%llu (read %u) got %d%s%s\n", pos, left, read,
389 ret, hit_stripe ? " HITSTRIPE" : "", was_short ? " SHORT" : "");
390
391 if (ret >= 0) {
392 int didpages;
393 if (was_short && (pos + ret < inode->i_size)) {
394 int zlen = min(this_len - ret,
395 inode->i_size - pos - ret);
396 int zoff = (o_direct ? buf_align : io_align) +
397 read + ret;
398 dout(" zero gap %llu to %llu\n",
399 pos + ret, pos + ret + zlen);
400 ceph_zero_page_vector_range(zoff, zlen, pages);
401 ret += zlen;
402 }
403
404 didpages = (page_align + ret) >> PAGE_CACHE_SHIFT;
405 pos += ret;
406 read = pos - off;
407 left -= ret;
408 page_pos += didpages;
409 pages_left -= didpages;
410
411 /* hit stripe and need continue*/
412 if (left && hit_stripe && pos < inode->i_size)
413 goto more;
414 }
415
416 if (read > 0) {
417 ret = read;
418 /* did we bounce off eof? */
419 if (pos + left > inode->i_size)
420 *checkeof = CHECK_EOF;
421 }
422
423 dout("striped_read returns %d\n", ret);
424 return ret;
425 }
426
427 /*
428 * Completely synchronous read and write methods. Direct from __user
429 * buffer to osd, or directly to user pages (if O_DIRECT).
430 *
431 * If the read spans object boundary, just do multiple reads.
432 */
433 static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *i,
434 int *checkeof)
435 {
436 struct file *file = iocb->ki_filp;
437 struct inode *inode = file_inode(file);
438 struct page **pages;
439 u64 off = iocb->ki_pos;
440 int num_pages, ret;
441 size_t len = iov_iter_count(i);
442
443 dout("sync_read on file %p %llu~%u %s\n", file, off,
444 (unsigned)len,
445 (file->f_flags & O_DIRECT) ? "O_DIRECT" : "");
446
447 if (!len)
448 return 0;
449 /*
450 * flush any page cache pages in this range. this
451 * will make concurrent normal and sync io slow,
452 * but it will at least behave sensibly when they are
453 * in sequence.
454 */
455 ret = filemap_write_and_wait_range(inode->i_mapping, off,
456 off + len);
457 if (ret < 0)
458 return ret;
459
460 if (iocb->ki_flags & IOCB_DIRECT) {
461 while (iov_iter_count(i)) {
462 size_t start;
463 ssize_t n;
464
465 n = iov_iter_get_pages_alloc(i, &pages, INT_MAX, &start);
466 if (n < 0)
467 return n;
468
469 num_pages = (n + start + PAGE_SIZE - 1) / PAGE_SIZE;
470
471 ret = striped_read(inode, off, n,
472 pages, num_pages, checkeof,
473 1, start);
474
475 ceph_put_page_vector(pages, num_pages, true);
476
477 if (ret <= 0)
478 break;
479 off += ret;
480 iov_iter_advance(i, ret);
481 if (ret < n)
482 break;
483 }
484 } else {
485 num_pages = calc_pages_for(off, len);
486 pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL);
487 if (IS_ERR(pages))
488 return PTR_ERR(pages);
489 ret = striped_read(inode, off, len, pages,
490 num_pages, checkeof, 0, 0);
491 if (ret > 0) {
492 int l, k = 0;
493 size_t left = ret;
494
495 while (left) {
496 size_t page_off = off & ~PAGE_MASK;
497 size_t copy = min_t(size_t,
498 PAGE_SIZE - page_off, left);
499 l = copy_page_to_iter(pages[k++], page_off,
500 copy, i);
501 off += l;
502 left -= l;
503 if (l < copy)
504 break;
505 }
506 }
507 ceph_release_page_vector(pages, num_pages);
508 }
509
510 if (off > iocb->ki_pos) {
511 ret = off - iocb->ki_pos;
512 iocb->ki_pos = off;
513 }
514
515 dout("sync_read result %d\n", ret);
516 return ret;
517 }
518
519 /*
520 * Write commit request unsafe callback, called to tell us when a
521 * request is unsafe (that is, in flight--has been handed to the
522 * messenger to send to its target osd). It is called again when
523 * we've received a response message indicating the request is
524 * "safe" (its CEPH_OSD_FLAG_ONDISK flag is set), or when a request
525 * is completed early (and unsuccessfully) due to a timeout or
526 * interrupt.
527 *
528 * This is used if we requested both an ACK and ONDISK commit reply
529 * from the OSD.
530 */
531 static void ceph_sync_write_unsafe(struct ceph_osd_request *req, bool unsafe)
532 {
533 struct ceph_inode_info *ci = ceph_inode(req->r_inode);
534
535 dout("%s %p tid %llu %ssafe\n", __func__, req, req->r_tid,
536 unsafe ? "un" : "");
537 if (unsafe) {
538 ceph_get_cap_refs(ci, CEPH_CAP_FILE_WR);
539 spin_lock(&ci->i_unsafe_lock);
540 list_add_tail(&req->r_unsafe_item,
541 &ci->i_unsafe_writes);
542 spin_unlock(&ci->i_unsafe_lock);
543 } else {
544 spin_lock(&ci->i_unsafe_lock);
545 list_del_init(&req->r_unsafe_item);
546 spin_unlock(&ci->i_unsafe_lock);
547 ceph_put_cap_refs(ci, CEPH_CAP_FILE_WR);
548 }
549 }
550
551
552 /*
553 * Synchronous write, straight from __user pointer or user pages.
554 *
555 * If write spans object boundary, just do multiple writes. (For a
556 * correct atomic write, we should e.g. take write locks on all
557 * objects, rollback on failure, etc.)
558 */
559 static ssize_t
560 ceph_sync_direct_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos,
561 struct ceph_snap_context *snapc)
562 {
563 struct file *file = iocb->ki_filp;
564 struct inode *inode = file_inode(file);
565 struct ceph_inode_info *ci = ceph_inode(inode);
566 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
567 struct ceph_vino vino;
568 struct ceph_osd_request *req;
569 struct page **pages;
570 int num_pages;
571 int written = 0;
572 int flags;
573 int check_caps = 0;
574 int ret;
575 struct timespec mtime = CURRENT_TIME;
576 size_t count = iov_iter_count(from);
577
578 if (ceph_snap(file_inode(file)) != CEPH_NOSNAP)
579 return -EROFS;
580
581 dout("sync_direct_write on file %p %lld~%u\n", file, pos,
582 (unsigned)count);
583
584 ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + count);
585 if (ret < 0)
586 return ret;
587
588 ret = invalidate_inode_pages2_range(inode->i_mapping,
589 pos >> PAGE_CACHE_SHIFT,
590 (pos + count) >> PAGE_CACHE_SHIFT);
591 if (ret < 0)
592 dout("invalidate_inode_pages2_range returned %d\n", ret);
593
594 flags = CEPH_OSD_FLAG_ORDERSNAP |
595 CEPH_OSD_FLAG_ONDISK |
596 CEPH_OSD_FLAG_WRITE;
597
598 while (iov_iter_count(from) > 0) {
599 u64 len = iov_iter_single_seg_count(from);
600 size_t start;
601 ssize_t n;
602
603 vino = ceph_vino(inode);
604 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
605 vino, pos, &len, 0,
606 2,/*include a 'startsync' command*/
607 CEPH_OSD_OP_WRITE, flags, snapc,
608 ci->i_truncate_seq,
609 ci->i_truncate_size,
610 false);
611 if (IS_ERR(req)) {
612 ret = PTR_ERR(req);
613 break;
614 }
615
616 osd_req_op_init(req, 1, CEPH_OSD_OP_STARTSYNC, 0);
617
618 n = iov_iter_get_pages_alloc(from, &pages, len, &start);
619 if (unlikely(n < 0)) {
620 ret = n;
621 ceph_osdc_put_request(req);
622 break;
623 }
624
625 num_pages = (n + start + PAGE_SIZE - 1) / PAGE_SIZE;
626 /*
627 * throw out any page cache pages in this range. this
628 * may block.
629 */
630 truncate_inode_pages_range(inode->i_mapping, pos,
631 (pos+n) | (PAGE_CACHE_SIZE-1));
632 osd_req_op_extent_osd_data_pages(req, 0, pages, n, start,
633 false, false);
634
635 /* BUG_ON(vino.snap != CEPH_NOSNAP); */
636 ceph_osdc_build_request(req, pos, snapc, vino.snap, &mtime);
637
638 ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
639 if (!ret)
640 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
641
642 ceph_put_page_vector(pages, num_pages, false);
643
644 ceph_osdc_put_request(req);
645 if (ret)
646 break;
647 pos += n;
648 written += n;
649 iov_iter_advance(from, n);
650
651 if (pos > i_size_read(inode)) {
652 check_caps = ceph_inode_set_size(inode, pos);
653 if (check_caps)
654 ceph_check_caps(ceph_inode(inode),
655 CHECK_CAPS_AUTHONLY,
656 NULL);
657 }
658 }
659
660 if (ret != -EOLDSNAPC && written > 0) {
661 iocb->ki_pos = pos;
662 ret = written;
663 }
664 return ret;
665 }
666
667
668 /*
669 * Synchronous write, straight from __user pointer or user pages.
670 *
671 * If write spans object boundary, just do multiple writes. (For a
672 * correct atomic write, we should e.g. take write locks on all
673 * objects, rollback on failure, etc.)
674 */
675 static ssize_t
676 ceph_sync_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos,
677 struct ceph_snap_context *snapc)
678 {
679 struct file *file = iocb->ki_filp;
680 struct inode *inode = file_inode(file);
681 struct ceph_inode_info *ci = ceph_inode(inode);
682 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
683 struct ceph_vino vino;
684 struct ceph_osd_request *req;
685 struct page **pages;
686 u64 len;
687 int num_pages;
688 int written = 0;
689 int flags;
690 int check_caps = 0;
691 int ret;
692 struct timespec mtime = CURRENT_TIME;
693 size_t count = iov_iter_count(from);
694
695 if (ceph_snap(file_inode(file)) != CEPH_NOSNAP)
696 return -EROFS;
697
698 dout("sync_write on file %p %lld~%u\n", file, pos, (unsigned)count);
699
700 ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + count);
701 if (ret < 0)
702 return ret;
703
704 ret = invalidate_inode_pages2_range(inode->i_mapping,
705 pos >> PAGE_CACHE_SHIFT,
706 (pos + count) >> PAGE_CACHE_SHIFT);
707 if (ret < 0)
708 dout("invalidate_inode_pages2_range returned %d\n", ret);
709
710 flags = CEPH_OSD_FLAG_ORDERSNAP |
711 CEPH_OSD_FLAG_ONDISK |
712 CEPH_OSD_FLAG_WRITE |
713 CEPH_OSD_FLAG_ACK;
714
715 while ((len = iov_iter_count(from)) > 0) {
716 size_t left;
717 int n;
718
719 vino = ceph_vino(inode);
720 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
721 vino, pos, &len, 0, 1,
722 CEPH_OSD_OP_WRITE, flags, snapc,
723 ci->i_truncate_seq,
724 ci->i_truncate_size,
725 false);
726 if (IS_ERR(req)) {
727 ret = PTR_ERR(req);
728 break;
729 }
730
731 /*
732 * write from beginning of first page,
733 * regardless of io alignment
734 */
735 num_pages = (len + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
736
737 pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL);
738 if (IS_ERR(pages)) {
739 ret = PTR_ERR(pages);
740 goto out;
741 }
742
743 left = len;
744 for (n = 0; n < num_pages; n++) {
745 size_t plen = min_t(size_t, left, PAGE_SIZE);
746 ret = copy_page_from_iter(pages[n], 0, plen, from);
747 if (ret != plen) {
748 ret = -EFAULT;
749 break;
750 }
751 left -= ret;
752 }
753
754 if (ret < 0) {
755 ceph_release_page_vector(pages, num_pages);
756 goto out;
757 }
758
759 /* get a second commit callback */
760 req->r_unsafe_callback = ceph_sync_write_unsafe;
761 req->r_inode = inode;
762
763 osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0,
764 false, true);
765
766 /* BUG_ON(vino.snap != CEPH_NOSNAP); */
767 ceph_osdc_build_request(req, pos, snapc, vino.snap, &mtime);
768
769 ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
770 if (!ret)
771 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
772
773 out:
774 ceph_osdc_put_request(req);
775 if (ret == 0) {
776 pos += len;
777 written += len;
778
779 if (pos > i_size_read(inode)) {
780 check_caps = ceph_inode_set_size(inode, pos);
781 if (check_caps)
782 ceph_check_caps(ceph_inode(inode),
783 CHECK_CAPS_AUTHONLY,
784 NULL);
785 }
786 } else
787 break;
788 }
789
790 if (ret != -EOLDSNAPC && written > 0) {
791 ret = written;
792 iocb->ki_pos = pos;
793 }
794 return ret;
795 }
796
797 /*
798 * Wrap generic_file_aio_read with checks for cap bits on the inode.
799 * Atomically grab references, so that those bits are not released
800 * back to the MDS mid-read.
801 *
802 * Hmm, the sync read case isn't actually async... should it be?
803 */
804 static ssize_t ceph_read_iter(struct kiocb *iocb, struct iov_iter *to)
805 {
806 struct file *filp = iocb->ki_filp;
807 struct ceph_file_info *fi = filp->private_data;
808 size_t len = iov_iter_count(to);
809 struct inode *inode = file_inode(filp);
810 struct ceph_inode_info *ci = ceph_inode(inode);
811 struct page *pinned_page = NULL;
812 ssize_t ret;
813 int want, got = 0;
814 int retry_op = 0, read = 0;
815
816 again:
817 dout("aio_read %p %llx.%llx %llu~%u trying to get caps on %p\n",
818 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len, inode);
819
820 if (fi->fmode & CEPH_FILE_MODE_LAZY)
821 want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
822 else
823 want = CEPH_CAP_FILE_CACHE;
824 ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, -1, &got, &pinned_page);
825 if (ret < 0)
826 return ret;
827
828 if ((got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0 ||
829 (iocb->ki_flags & IOCB_DIRECT) ||
830 (fi->flags & CEPH_F_SYNC)) {
831
832 dout("aio_sync_read %p %llx.%llx %llu~%u got cap refs on %s\n",
833 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
834 ceph_cap_string(got));
835
836 if (ci->i_inline_version == CEPH_INLINE_NONE) {
837 /* hmm, this isn't really async... */
838 ret = ceph_sync_read(iocb, to, &retry_op);
839 } else {
840 retry_op = READ_INLINE;
841 }
842 } else {
843 dout("aio_read %p %llx.%llx %llu~%u got cap refs on %s\n",
844 inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
845 ceph_cap_string(got));
846
847 ret = generic_file_read_iter(iocb, to);
848 }
849 dout("aio_read %p %llx.%llx dropping cap refs on %s = %d\n",
850 inode, ceph_vinop(inode), ceph_cap_string(got), (int)ret);
851 if (pinned_page) {
852 page_cache_release(pinned_page);
853 pinned_page = NULL;
854 }
855 ceph_put_cap_refs(ci, got);
856 if (retry_op && ret >= 0) {
857 int statret;
858 struct page *page = NULL;
859 loff_t i_size;
860 if (retry_op == READ_INLINE) {
861 page = __page_cache_alloc(GFP_KERNEL);
862 if (!page)
863 return -ENOMEM;
864 }
865
866 statret = __ceph_do_getattr(inode, page,
867 CEPH_STAT_CAP_INLINE_DATA, !!page);
868 if (statret < 0) {
869 __free_page(page);
870 if (statret == -ENODATA) {
871 BUG_ON(retry_op != READ_INLINE);
872 goto again;
873 }
874 return statret;
875 }
876
877 i_size = i_size_read(inode);
878 if (retry_op == READ_INLINE) {
879 BUG_ON(ret > 0 || read > 0);
880 if (iocb->ki_pos < i_size &&
881 iocb->ki_pos < PAGE_CACHE_SIZE) {
882 loff_t end = min_t(loff_t, i_size,
883 iocb->ki_pos + len);
884 end = min_t(loff_t, end, PAGE_CACHE_SIZE);
885 if (statret < end)
886 zero_user_segment(page, statret, end);
887 ret = copy_page_to_iter(page,
888 iocb->ki_pos & ~PAGE_MASK,
889 end - iocb->ki_pos, to);
890 iocb->ki_pos += ret;
891 read += ret;
892 }
893 if (iocb->ki_pos < i_size && read < len) {
894 size_t zlen = min_t(size_t, len - read,
895 i_size - iocb->ki_pos);
896 ret = iov_iter_zero(zlen, to);
897 iocb->ki_pos += ret;
898 read += ret;
899 }
900 __free_pages(page, 0);
901 return read;
902 }
903
904 /* hit EOF or hole? */
905 if (retry_op == CHECK_EOF && iocb->ki_pos < i_size &&
906 ret < len) {
907 dout("sync_read hit hole, ppos %lld < size %lld"
908 ", reading more\n", iocb->ki_pos,
909 inode->i_size);
910
911 read += ret;
912 len -= ret;
913 retry_op = 0;
914 goto again;
915 }
916 }
917
918 if (ret >= 0)
919 ret += read;
920
921 return ret;
922 }
923
924 /*
925 * Take cap references to avoid releasing caps to MDS mid-write.
926 *
927 * If we are synchronous, and write with an old snap context, the OSD
928 * may return EOLDSNAPC. In that case, retry the write.. _after_
929 * dropping our cap refs and allowing the pending snap to logically
930 * complete _before_ this write occurs.
931 *
932 * If we are near ENOSPC, write synchronously.
933 */
934 static ssize_t ceph_write_iter(struct kiocb *iocb, struct iov_iter *from)
935 {
936 struct file *file = iocb->ki_filp;
937 struct ceph_file_info *fi = file->private_data;
938 struct inode *inode = file_inode(file);
939 struct ceph_inode_info *ci = ceph_inode(inode);
940 struct ceph_osd_client *osdc =
941 &ceph_sb_to_client(inode->i_sb)->client->osdc;
942 struct ceph_cap_flush *prealloc_cf;
943 ssize_t count, written = 0;
944 int err, want, got;
945 loff_t pos;
946
947 if (ceph_snap(inode) != CEPH_NOSNAP)
948 return -EROFS;
949
950 prealloc_cf = ceph_alloc_cap_flush();
951 if (!prealloc_cf)
952 return -ENOMEM;
953
954 mutex_lock(&inode->i_mutex);
955
956 /* We can write back this queue in page reclaim */
957 current->backing_dev_info = inode_to_bdi(inode);
958
959 err = generic_write_checks(iocb, from);
960 if (err <= 0)
961 goto out;
962
963 pos = iocb->ki_pos;
964 count = iov_iter_count(from);
965 err = file_remove_privs(file);
966 if (err)
967 goto out;
968
969 err = file_update_time(file);
970 if (err)
971 goto out;
972
973 if (ci->i_inline_version != CEPH_INLINE_NONE) {
974 err = ceph_uninline_data(file, NULL);
975 if (err < 0)
976 goto out;
977 }
978
979 retry_snap:
980 if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL)) {
981 err = -ENOSPC;
982 goto out;
983 }
984
985 dout("aio_write %p %llx.%llx %llu~%zd getting caps. i_size %llu\n",
986 inode, ceph_vinop(inode), pos, count, inode->i_size);
987 if (fi->fmode & CEPH_FILE_MODE_LAZY)
988 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
989 else
990 want = CEPH_CAP_FILE_BUFFER;
991 got = 0;
992 err = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, pos + count,
993 &got, NULL);
994 if (err < 0)
995 goto out;
996
997 dout("aio_write %p %llx.%llx %llu~%zd got cap refs on %s\n",
998 inode, ceph_vinop(inode), pos, count, ceph_cap_string(got));
999
1000 if ((got & (CEPH_CAP_FILE_BUFFER|CEPH_CAP_FILE_LAZYIO)) == 0 ||
1001 (iocb->ki_flags & IOCB_DIRECT) || (fi->flags & CEPH_F_SYNC)) {
1002 struct ceph_snap_context *snapc;
1003 struct iov_iter data;
1004 mutex_unlock(&inode->i_mutex);
1005
1006 spin_lock(&ci->i_ceph_lock);
1007 if (__ceph_have_pending_cap_snap(ci)) {
1008 struct ceph_cap_snap *capsnap =
1009 list_last_entry(&ci->i_cap_snaps,
1010 struct ceph_cap_snap,
1011 ci_item);
1012 snapc = ceph_get_snap_context(capsnap->context);
1013 } else {
1014 BUG_ON(!ci->i_head_snapc);
1015 snapc = ceph_get_snap_context(ci->i_head_snapc);
1016 }
1017 spin_unlock(&ci->i_ceph_lock);
1018
1019 /* we might need to revert back to that point */
1020 data = *from;
1021 if (iocb->ki_flags & IOCB_DIRECT)
1022 written = ceph_sync_direct_write(iocb, &data, pos,
1023 snapc);
1024 else
1025 written = ceph_sync_write(iocb, &data, pos, snapc);
1026 if (written == -EOLDSNAPC) {
1027 dout("aio_write %p %llx.%llx %llu~%u"
1028 "got EOLDSNAPC, retrying\n",
1029 inode, ceph_vinop(inode),
1030 pos, (unsigned)count);
1031 mutex_lock(&inode->i_mutex);
1032 goto retry_snap;
1033 }
1034 if (written > 0)
1035 iov_iter_advance(from, written);
1036 ceph_put_snap_context(snapc);
1037 } else {
1038 loff_t old_size = inode->i_size;
1039 /*
1040 * No need to acquire the i_truncate_mutex. Because
1041 * the MDS revokes Fwb caps before sending truncate
1042 * message to us. We can't get Fwb cap while there
1043 * are pending vmtruncate. So write and vmtruncate
1044 * can not run at the same time
1045 */
1046 written = generic_perform_write(file, from, pos);
1047 if (likely(written >= 0))
1048 iocb->ki_pos = pos + written;
1049 if (inode->i_size > old_size)
1050 ceph_fscache_update_objectsize(inode);
1051 mutex_unlock(&inode->i_mutex);
1052 }
1053
1054 if (written >= 0) {
1055 int dirty;
1056 spin_lock(&ci->i_ceph_lock);
1057 ci->i_inline_version = CEPH_INLINE_NONE;
1058 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
1059 &prealloc_cf);
1060 spin_unlock(&ci->i_ceph_lock);
1061 if (dirty)
1062 __mark_inode_dirty(inode, dirty);
1063 }
1064
1065 dout("aio_write %p %llx.%llx %llu~%u dropping cap refs on %s\n",
1066 inode, ceph_vinop(inode), pos, (unsigned)count,
1067 ceph_cap_string(got));
1068 ceph_put_cap_refs(ci, got);
1069
1070 if (written >= 0 &&
1071 ((file->f_flags & O_SYNC) || IS_SYNC(file->f_mapping->host) ||
1072 ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_NEARFULL))) {
1073 err = vfs_fsync_range(file, pos, pos + written - 1, 1);
1074 if (err < 0)
1075 written = err;
1076 }
1077
1078 goto out_unlocked;
1079
1080 out:
1081 mutex_unlock(&inode->i_mutex);
1082 out_unlocked:
1083 ceph_free_cap_flush(prealloc_cf);
1084 current->backing_dev_info = NULL;
1085 return written ? written : err;
1086 }
1087
1088 /*
1089 * llseek. be sure to verify file size on SEEK_END.
1090 */
1091 static loff_t ceph_llseek(struct file *file, loff_t offset, int whence)
1092 {
1093 struct inode *inode = file->f_mapping->host;
1094 int ret;
1095
1096 mutex_lock(&inode->i_mutex);
1097
1098 if (whence == SEEK_END || whence == SEEK_DATA || whence == SEEK_HOLE) {
1099 ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false);
1100 if (ret < 0) {
1101 offset = ret;
1102 goto out;
1103 }
1104 }
1105
1106 switch (whence) {
1107 case SEEK_END:
1108 offset += inode->i_size;
1109 break;
1110 case SEEK_CUR:
1111 /*
1112 * Here we special-case the lseek(fd, 0, SEEK_CUR)
1113 * position-querying operation. Avoid rewriting the "same"
1114 * f_pos value back to the file because a concurrent read(),
1115 * write() or lseek() might have altered it
1116 */
1117 if (offset == 0) {
1118 offset = file->f_pos;
1119 goto out;
1120 }
1121 offset += file->f_pos;
1122 break;
1123 case SEEK_DATA:
1124 if (offset >= inode->i_size) {
1125 ret = -ENXIO;
1126 goto out;
1127 }
1128 break;
1129 case SEEK_HOLE:
1130 if (offset >= inode->i_size) {
1131 ret = -ENXIO;
1132 goto out;
1133 }
1134 offset = inode->i_size;
1135 break;
1136 }
1137
1138 offset = vfs_setpos(file, offset, inode->i_sb->s_maxbytes);
1139
1140 out:
1141 mutex_unlock(&inode->i_mutex);
1142 return offset;
1143 }
1144
1145 static inline void ceph_zero_partial_page(
1146 struct inode *inode, loff_t offset, unsigned size)
1147 {
1148 struct page *page;
1149 pgoff_t index = offset >> PAGE_CACHE_SHIFT;
1150
1151 page = find_lock_page(inode->i_mapping, index);
1152 if (page) {
1153 wait_on_page_writeback(page);
1154 zero_user(page, offset & (PAGE_CACHE_SIZE - 1), size);
1155 unlock_page(page);
1156 page_cache_release(page);
1157 }
1158 }
1159
1160 static void ceph_zero_pagecache_range(struct inode *inode, loff_t offset,
1161 loff_t length)
1162 {
1163 loff_t nearly = round_up(offset, PAGE_CACHE_SIZE);
1164 if (offset < nearly) {
1165 loff_t size = nearly - offset;
1166 if (length < size)
1167 size = length;
1168 ceph_zero_partial_page(inode, offset, size);
1169 offset += size;
1170 length -= size;
1171 }
1172 if (length >= PAGE_CACHE_SIZE) {
1173 loff_t size = round_down(length, PAGE_CACHE_SIZE);
1174 truncate_pagecache_range(inode, offset, offset + size - 1);
1175 offset += size;
1176 length -= size;
1177 }
1178 if (length)
1179 ceph_zero_partial_page(inode, offset, length);
1180 }
1181
1182 static int ceph_zero_partial_object(struct inode *inode,
1183 loff_t offset, loff_t *length)
1184 {
1185 struct ceph_inode_info *ci = ceph_inode(inode);
1186 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1187 struct ceph_osd_request *req;
1188 int ret = 0;
1189 loff_t zero = 0;
1190 int op;
1191
1192 if (!length) {
1193 op = offset ? CEPH_OSD_OP_DELETE : CEPH_OSD_OP_TRUNCATE;
1194 length = &zero;
1195 } else {
1196 op = CEPH_OSD_OP_ZERO;
1197 }
1198
1199 req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1200 ceph_vino(inode),
1201 offset, length,
1202 0, 1, op,
1203 CEPH_OSD_FLAG_WRITE |
1204 CEPH_OSD_FLAG_ONDISK,
1205 NULL, 0, 0, false);
1206 if (IS_ERR(req)) {
1207 ret = PTR_ERR(req);
1208 goto out;
1209 }
1210
1211 ceph_osdc_build_request(req, offset, NULL, ceph_vino(inode).snap,
1212 &inode->i_mtime);
1213
1214 ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
1215 if (!ret) {
1216 ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
1217 if (ret == -ENOENT)
1218 ret = 0;
1219 }
1220 ceph_osdc_put_request(req);
1221
1222 out:
1223 return ret;
1224 }
1225
1226 static int ceph_zero_objects(struct inode *inode, loff_t offset, loff_t length)
1227 {
1228 int ret = 0;
1229 struct ceph_inode_info *ci = ceph_inode(inode);
1230 s32 stripe_unit = ceph_file_layout_su(ci->i_layout);
1231 s32 stripe_count = ceph_file_layout_stripe_count(ci->i_layout);
1232 s32 object_size = ceph_file_layout_object_size(ci->i_layout);
1233 u64 object_set_size = object_size * stripe_count;
1234 u64 nearly, t;
1235
1236 /* round offset up to next period boundary */
1237 nearly = offset + object_set_size - 1;
1238 t = nearly;
1239 nearly -= do_div(t, object_set_size);
1240
1241 while (length && offset < nearly) {
1242 loff_t size = length;
1243 ret = ceph_zero_partial_object(inode, offset, &size);
1244 if (ret < 0)
1245 return ret;
1246 offset += size;
1247 length -= size;
1248 }
1249 while (length >= object_set_size) {
1250 int i;
1251 loff_t pos = offset;
1252 for (i = 0; i < stripe_count; ++i) {
1253 ret = ceph_zero_partial_object(inode, pos, NULL);
1254 if (ret < 0)
1255 return ret;
1256 pos += stripe_unit;
1257 }
1258 offset += object_set_size;
1259 length -= object_set_size;
1260 }
1261 while (length) {
1262 loff_t size = length;
1263 ret = ceph_zero_partial_object(inode, offset, &size);
1264 if (ret < 0)
1265 return ret;
1266 offset += size;
1267 length -= size;
1268 }
1269 return ret;
1270 }
1271
1272 static long ceph_fallocate(struct file *file, int mode,
1273 loff_t offset, loff_t length)
1274 {
1275 struct ceph_file_info *fi = file->private_data;
1276 struct inode *inode = file_inode(file);
1277 struct ceph_inode_info *ci = ceph_inode(inode);
1278 struct ceph_osd_client *osdc =
1279 &ceph_inode_to_client(inode)->client->osdc;
1280 struct ceph_cap_flush *prealloc_cf;
1281 int want, got = 0;
1282 int dirty;
1283 int ret = 0;
1284 loff_t endoff = 0;
1285 loff_t size;
1286
1287 if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
1288 return -EOPNOTSUPP;
1289
1290 if (!S_ISREG(inode->i_mode))
1291 return -EOPNOTSUPP;
1292
1293 prealloc_cf = ceph_alloc_cap_flush();
1294 if (!prealloc_cf)
1295 return -ENOMEM;
1296
1297 mutex_lock(&inode->i_mutex);
1298
1299 if (ceph_snap(inode) != CEPH_NOSNAP) {
1300 ret = -EROFS;
1301 goto unlock;
1302 }
1303
1304 if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL) &&
1305 !(mode & FALLOC_FL_PUNCH_HOLE)) {
1306 ret = -ENOSPC;
1307 goto unlock;
1308 }
1309
1310 if (ci->i_inline_version != CEPH_INLINE_NONE) {
1311 ret = ceph_uninline_data(file, NULL);
1312 if (ret < 0)
1313 goto unlock;
1314 }
1315
1316 size = i_size_read(inode);
1317 if (!(mode & FALLOC_FL_KEEP_SIZE))
1318 endoff = offset + length;
1319
1320 if (fi->fmode & CEPH_FILE_MODE_LAZY)
1321 want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
1322 else
1323 want = CEPH_CAP_FILE_BUFFER;
1324
1325 ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, endoff, &got, NULL);
1326 if (ret < 0)
1327 goto unlock;
1328
1329 if (mode & FALLOC_FL_PUNCH_HOLE) {
1330 if (offset < size)
1331 ceph_zero_pagecache_range(inode, offset, length);
1332 ret = ceph_zero_objects(inode, offset, length);
1333 } else if (endoff > size) {
1334 truncate_pagecache_range(inode, size, -1);
1335 if (ceph_inode_set_size(inode, endoff))
1336 ceph_check_caps(ceph_inode(inode),
1337 CHECK_CAPS_AUTHONLY, NULL);
1338 }
1339
1340 if (!ret) {
1341 spin_lock(&ci->i_ceph_lock);
1342 ci->i_inline_version = CEPH_INLINE_NONE;
1343 dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
1344 &prealloc_cf);
1345 spin_unlock(&ci->i_ceph_lock);
1346 if (dirty)
1347 __mark_inode_dirty(inode, dirty);
1348 }
1349
1350 ceph_put_cap_refs(ci, got);
1351 unlock:
1352 mutex_unlock(&inode->i_mutex);
1353 ceph_free_cap_flush(prealloc_cf);
1354 return ret;
1355 }
1356
1357 const struct file_operations ceph_file_fops = {
1358 .open = ceph_open,
1359 .release = ceph_release,
1360 .llseek = ceph_llseek,
1361 .read_iter = ceph_read_iter,
1362 .write_iter = ceph_write_iter,
1363 .mmap = ceph_mmap,
1364 .fsync = ceph_fsync,
1365 .lock = ceph_lock,
1366 .flock = ceph_flock,
1367 .splice_read = generic_file_splice_read,
1368 .splice_write = iter_file_splice_write,
1369 .unlocked_ioctl = ceph_ioctl,
1370 .compat_ioctl = ceph_ioctl,
1371 .fallocate = ceph_fallocate,
1372 };
1373
Linux with added FPC-III support