xref: /openbmc/linux/fs/ceph/file.c (revision 1c2f87c2)
1 #include <linux/ceph/ceph_debug.h>
2 
3 #include <linux/module.h>
4 #include <linux/sched.h>
5 #include <linux/slab.h>
6 #include <linux/file.h>
7 #include <linux/mount.h>
8 #include <linux/namei.h>
9 #include <linux/writeback.h>
10 #include <linux/aio.h>
11 #include <linux/falloc.h>
12 
13 #include "super.h"
14 #include "mds_client.h"
15 #include "cache.h"
16 
17 /*
18  * Ceph file operations
19  *
20  * Implement basic open/close functionality, and implement
21  * read/write.
22  *
23  * We implement three modes of file I/O:
24  *  - buffered uses the generic_file_aio_{read,write} helpers
25  *
26  *  - synchronous is used when there is multi-client read/write
27  *    sharing, avoids the page cache, and synchronously waits for an
28  *    ack from the OSD.
29  *
30  *  - direct io takes the variant of the sync path that references
31  *    user pages directly.
32  *
33  * fsync() flushes and waits on dirty pages, but just queues metadata
34  * for writeback: since the MDS can recover size and mtime there is no
35  * need to wait for MDS acknowledgement.
36  */
37 
38 
39 /*
40  * Prepare an open request.  Preallocate ceph_cap to avoid an
41  * inopportune ENOMEM later.
42  */
43 static struct ceph_mds_request *
44 prepare_open_request(struct super_block *sb, int flags, int create_mode)
45 {
46 	struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
47 	struct ceph_mds_client *mdsc = fsc->mdsc;
48 	struct ceph_mds_request *req;
49 	int want_auth = USE_ANY_MDS;
50 	int op = (flags & O_CREAT) ? CEPH_MDS_OP_CREATE : CEPH_MDS_OP_OPEN;
51 
52 	if (flags & (O_WRONLY|O_RDWR|O_CREAT|O_TRUNC))
53 		want_auth = USE_AUTH_MDS;
54 
55 	req = ceph_mdsc_create_request(mdsc, op, want_auth);
56 	if (IS_ERR(req))
57 		goto out;
58 	req->r_fmode = ceph_flags_to_mode(flags);
59 	req->r_args.open.flags = cpu_to_le32(flags);
60 	req->r_args.open.mode = cpu_to_le32(create_mode);
61 out:
62 	return req;
63 }
64 
65 /*
66  * initialize private struct file data.
67  * if we fail, clean up by dropping fmode reference on the ceph_inode
68  */
69 static int ceph_init_file(struct inode *inode, struct file *file, int fmode)
70 {
71 	struct ceph_file_info *cf;
72 	int ret = 0;
73 	struct ceph_inode_info *ci = ceph_inode(inode);
74 	struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
75 	struct ceph_mds_client *mdsc = fsc->mdsc;
76 
77 	switch (inode->i_mode & S_IFMT) {
78 	case S_IFREG:
79 		/* First file open request creates the cookie, we want to keep
80 		 * this cookie around for the filetime of the inode as not to
81 		 * have to worry about fscache register / revoke / operation
82 		 * races.
83 		 *
84 		 * Also, if we know the operation is going to invalidate data
85 		 * (non readonly) just nuke the cache right away.
86 		 */
87 		ceph_fscache_register_inode_cookie(mdsc->fsc, ci);
88 		if ((fmode & CEPH_FILE_MODE_WR))
89 			ceph_fscache_invalidate(inode);
90 	case S_IFDIR:
91 		dout("init_file %p %p 0%o (regular)\n", inode, file,
92 		     inode->i_mode);
93 		cf = kmem_cache_alloc(ceph_file_cachep, GFP_NOFS | __GFP_ZERO);
94 		if (cf == NULL) {
95 			ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */
96 			return -ENOMEM;
97 		}
98 		cf->fmode = fmode;
99 		cf->next_offset = 2;
100 		file->private_data = cf;
101 		BUG_ON(inode->i_fop->release != ceph_release);
102 		break;
103 
104 	case S_IFLNK:
105 		dout("init_file %p %p 0%o (symlink)\n", inode, file,
106 		     inode->i_mode);
107 		ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */
108 		break;
109 
110 	default:
111 		dout("init_file %p %p 0%o (special)\n", inode, file,
112 		     inode->i_mode);
113 		/*
114 		 * we need to drop the open ref now, since we don't
115 		 * have .release set to ceph_release.
116 		 */
117 		ceph_put_fmode(ceph_inode(inode), fmode); /* clean up */
118 		BUG_ON(inode->i_fop->release == ceph_release);
119 
120 		/* call the proper open fop */
121 		ret = inode->i_fop->open(inode, file);
122 	}
123 	return ret;
124 }
125 
126 /*
127  * If we already have the requisite capabilities, we can satisfy
128  * the open request locally (no need to request new caps from the
129  * MDS).  We do, however, need to inform the MDS (asynchronously)
130  * if our wanted caps set expands.
131  */
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_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 	int err;
239 
240 	dout("atomic_open %p dentry %p '%.*s' %s flags %d mode 0%o\n",
241 	     dir, dentry, dentry->d_name.len, dentry->d_name.name,
242 	     d_unhashed(dentry) ? "unhashed" : "hashed", flags, mode);
243 
244 	if (dentry->d_name.len > NAME_MAX)
245 		return -ENAMETOOLONG;
246 
247 	err = ceph_init_dentry(dentry);
248 	if (err < 0)
249 		return err;
250 
251 	/* do the open */
252 	req = prepare_open_request(dir->i_sb, flags, mode);
253 	if (IS_ERR(req))
254 		return PTR_ERR(req);
255 	req->r_dentry = dget(dentry);
256 	req->r_num_caps = 2;
257 	if (flags & O_CREAT) {
258 		req->r_dentry_drop = CEPH_CAP_FILE_SHARED;
259 		req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
260 	}
261 	req->r_locked_dir = dir;           /* caller holds dir->i_mutex */
262 	err = ceph_mdsc_do_request(mdsc,
263 				   (flags & (O_CREAT|O_TRUNC)) ? dir : NULL,
264 				   req);
265 	if (err)
266 		goto out_err;
267 
268 	err = ceph_handle_snapdir(req, dentry, err);
269 	if (err == 0 && (flags & O_CREAT) && !req->r_reply_info.head->is_dentry)
270 		err = ceph_handle_notrace_create(dir, dentry);
271 
272 	if (d_unhashed(dentry)) {
273 		dn = ceph_finish_lookup(req, dentry, err);
274 		if (IS_ERR(dn))
275 			err = PTR_ERR(dn);
276 	} else {
277 		/* we were given a hashed negative dentry */
278 		dn = NULL;
279 	}
280 	if (err)
281 		goto out_err;
282 	if (dn || dentry->d_inode == NULL || S_ISLNK(dentry->d_inode->i_mode)) {
283 		/* make vfs retry on splice, ENOENT, or symlink */
284 		dout("atomic_open finish_no_open on dn %p\n", dn);
285 		err = finish_no_open(file, dn);
286 	} else {
287 		dout("atomic_open finish_open on dn %p\n", dn);
288 		if (req->r_op == CEPH_MDS_OP_CREATE && req->r_reply_info.has_create_ino) {
289 			ceph_init_acl(dentry, dentry->d_inode, dir);
290 			*opened |= FILE_CREATED;
291 		}
292 		err = finish_open(file, dentry, ceph_open, opened);
293 	}
294 out_err:
295 	if (!req->r_err && req->r_target_inode)
296 		ceph_put_fmode(ceph_inode(req->r_target_inode), req->r_fmode);
297 	ceph_mdsc_put_request(req);
298 	dout("atomic_open result=%d\n", err);
299 	return err;
300 }
301 
302 int ceph_release(struct inode *inode, struct file *file)
303 {
304 	struct ceph_inode_info *ci = ceph_inode(inode);
305 	struct ceph_file_info *cf = file->private_data;
306 
307 	dout("release inode %p file %p\n", inode, file);
308 	ceph_put_fmode(ci, cf->fmode);
309 	if (cf->last_readdir)
310 		ceph_mdsc_put_request(cf->last_readdir);
311 	kfree(cf->last_name);
312 	kfree(cf->dir_info);
313 	dput(cf->dentry);
314 	kmem_cache_free(ceph_file_cachep, cf);
315 
316 	/* wake up anyone waiting for caps on this inode */
317 	wake_up_all(&ci->i_cap_wq);
318 	return 0;
319 }
320 
321 /*
322  * Read a range of bytes striped over one or more objects.  Iterate over
323  * objects we stripe over.  (That's not atomic, but good enough for now.)
324  *
325  * If we get a short result from the OSD, check against i_size; we need to
326  * only return a short read to the caller if we hit EOF.
327  */
328 static int striped_read(struct inode *inode,
329 			u64 off, u64 len,
330 			struct page **pages, int num_pages,
331 			int *checkeof, bool o_direct,
332 			unsigned long buf_align)
333 {
334 	struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
335 	struct ceph_inode_info *ci = ceph_inode(inode);
336 	u64 pos, this_len, left;
337 	int io_align, page_align;
338 	int pages_left;
339 	int read;
340 	struct page **page_pos;
341 	int ret;
342 	bool hit_stripe, was_short;
343 
344 	/*
345 	 * we may need to do multiple reads.  not atomic, unfortunately.
346 	 */
347 	pos = off;
348 	left = len;
349 	page_pos = pages;
350 	pages_left = num_pages;
351 	read = 0;
352 	io_align = off & ~PAGE_MASK;
353 
354 more:
355 	if (o_direct)
356 		page_align = (pos - io_align + buf_align) & ~PAGE_MASK;
357 	else
358 		page_align = pos & ~PAGE_MASK;
359 	this_len = left;
360 	ret = ceph_osdc_readpages(&fsc->client->osdc, ceph_vino(inode),
361 				  &ci->i_layout, pos, &this_len,
362 				  ci->i_truncate_seq,
363 				  ci->i_truncate_size,
364 				  page_pos, pages_left, page_align);
365 	if (ret == -ENOENT)
366 		ret = 0;
367 	hit_stripe = this_len < left;
368 	was_short = ret >= 0 && ret < this_len;
369 	dout("striped_read %llu~%llu (read %u) got %d%s%s\n", pos, left, read,
370 	     ret, hit_stripe ? " HITSTRIPE" : "", was_short ? " SHORT" : "");
371 
372 	if (ret >= 0) {
373 		int didpages;
374 		if (was_short && (pos + ret < inode->i_size)) {
375 			u64 tmp = min(this_len - ret,
376 					inode->i_size - pos - ret);
377 			dout(" zero gap %llu to %llu\n",
378 				pos + ret, pos + ret + tmp);
379 			ceph_zero_page_vector_range(page_align + read + ret,
380 							tmp, pages);
381 			ret += tmp;
382 		}
383 
384 		didpages = (page_align + ret) >> PAGE_CACHE_SHIFT;
385 		pos += ret;
386 		read = pos - off;
387 		left -= ret;
388 		page_pos += didpages;
389 		pages_left -= didpages;
390 
391 		/* hit stripe and need continue*/
392 		if (left && hit_stripe && pos < inode->i_size)
393 			goto more;
394 	}
395 
396 	if (read > 0) {
397 		ret = read;
398 		/* did we bounce off eof? */
399 		if (pos + left > inode->i_size)
400 			*checkeof = 1;
401 	}
402 
403 	dout("striped_read returns %d\n", ret);
404 	return ret;
405 }
406 
407 /*
408  * Completely synchronous read and write methods.  Direct from __user
409  * buffer to osd, or directly to user pages (if O_DIRECT).
410  *
411  * If the read spans object boundary, just do multiple reads.
412  */
413 static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *i,
414 				int *checkeof)
415 {
416 	struct file *file = iocb->ki_filp;
417 	struct inode *inode = file_inode(file);
418 	struct page **pages;
419 	u64 off = iocb->ki_pos;
420 	int num_pages, ret;
421 	size_t len = i->count;
422 
423 	dout("sync_read on file %p %llu~%u %s\n", file, off,
424 	     (unsigned)len,
425 	     (file->f_flags & O_DIRECT) ? "O_DIRECT" : "");
426 	/*
427 	 * flush any page cache pages in this range.  this
428 	 * will make concurrent normal and sync io slow,
429 	 * but it will at least behave sensibly when they are
430 	 * in sequence.
431 	 */
432 	ret = filemap_write_and_wait_range(inode->i_mapping, off,
433 						off + len);
434 	if (ret < 0)
435 		return ret;
436 
437 	if (file->f_flags & O_DIRECT) {
438 		while (iov_iter_count(i)) {
439 			void __user *data = i->iov[0].iov_base + i->iov_offset;
440 			size_t len = i->iov[0].iov_len - i->iov_offset;
441 
442 			num_pages = calc_pages_for((unsigned long)data, len);
443 			pages = ceph_get_direct_page_vector(data,
444 							    num_pages, true);
445 			if (IS_ERR(pages))
446 				return PTR_ERR(pages);
447 
448 			ret = striped_read(inode, off, len,
449 					   pages, num_pages, checkeof,
450 					   1, (unsigned long)data & ~PAGE_MASK);
451 			ceph_put_page_vector(pages, num_pages, true);
452 
453 			if (ret <= 0)
454 				break;
455 			off += ret;
456 			iov_iter_advance(i, ret);
457 			if (ret < len)
458 				break;
459 		}
460 	} else {
461 		num_pages = calc_pages_for(off, len);
462 		pages = ceph_alloc_page_vector(num_pages, GFP_NOFS);
463 		if (IS_ERR(pages))
464 			return PTR_ERR(pages);
465 		ret = striped_read(inode, off, len, pages,
466 					num_pages, checkeof, 0, 0);
467 		if (ret > 0) {
468 			int l, k = 0;
469 			size_t left = len = ret;
470 
471 			while (left) {
472 				void __user *data = i->iov[0].iov_base
473 							+ i->iov_offset;
474 				l = min(i->iov[0].iov_len - i->iov_offset,
475 					left);
476 
477 				ret = ceph_copy_page_vector_to_user(&pages[k],
478 								    data, off,
479 								    l);
480 				if (ret > 0) {
481 					iov_iter_advance(i, ret);
482 					left -= ret;
483 					off += ret;
484 					k = calc_pages_for(iocb->ki_pos,
485 							   len - left + 1) - 1;
486 					BUG_ON(k >= num_pages && left);
487 				} else
488 					break;
489 			}
490 		}
491 		ceph_release_page_vector(pages, num_pages);
492 	}
493 
494 	if (off > iocb->ki_pos) {
495 		ret = off - iocb->ki_pos;
496 		iocb->ki_pos = off;
497 	}
498 
499 	dout("sync_read result %d\n", ret);
500 	return ret;
501 }
502 
503 /*
504  * Write commit request unsafe callback, called to tell us when a
505  * request is unsafe (that is, in flight--has been handed to the
506  * messenger to send to its target osd).  It is called again when
507  * we've received a response message indicating the request is
508  * "safe" (its CEPH_OSD_FLAG_ONDISK flag is set), or when a request
509  * is completed early (and unsuccessfully) due to a timeout or
510  * interrupt.
511  *
512  * This is used if we requested both an ACK and ONDISK commit reply
513  * from the OSD.
514  */
515 static void ceph_sync_write_unsafe(struct ceph_osd_request *req, bool unsafe)
516 {
517 	struct ceph_inode_info *ci = ceph_inode(req->r_inode);
518 
519 	dout("%s %p tid %llu %ssafe\n", __func__, req, req->r_tid,
520 		unsafe ? "un" : "");
521 	if (unsafe) {
522 		ceph_get_cap_refs(ci, CEPH_CAP_FILE_WR);
523 		spin_lock(&ci->i_unsafe_lock);
524 		list_add_tail(&req->r_unsafe_item,
525 			      &ci->i_unsafe_writes);
526 		spin_unlock(&ci->i_unsafe_lock);
527 	} else {
528 		spin_lock(&ci->i_unsafe_lock);
529 		list_del_init(&req->r_unsafe_item);
530 		spin_unlock(&ci->i_unsafe_lock);
531 		ceph_put_cap_refs(ci, CEPH_CAP_FILE_WR);
532 	}
533 }
534 
535 
536 /*
537  * Synchronous write, straight from __user pointer or user pages.
538  *
539  * If write spans object boundary, just do multiple writes.  (For a
540  * correct atomic write, we should e.g. take write locks on all
541  * objects, rollback on failure, etc.)
542  */
543 static ssize_t
544 ceph_sync_direct_write(struct kiocb *iocb, const struct iovec *iov,
545 		       unsigned long nr_segs, size_t count)
546 {
547 	struct file *file = iocb->ki_filp;
548 	struct inode *inode = file_inode(file);
549 	struct ceph_inode_info *ci = ceph_inode(inode);
550 	struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
551 	struct ceph_snap_context *snapc;
552 	struct ceph_vino vino;
553 	struct ceph_osd_request *req;
554 	struct page **pages;
555 	int num_pages;
556 	int written = 0;
557 	int flags;
558 	int check_caps = 0;
559 	int page_align;
560 	int ret;
561 	struct timespec mtime = CURRENT_TIME;
562 	loff_t pos = iocb->ki_pos;
563 	struct iov_iter i;
564 
565 	if (ceph_snap(file_inode(file)) != CEPH_NOSNAP)
566 		return -EROFS;
567 
568 	dout("sync_direct_write on file %p %lld~%u\n", file, pos,
569 	     (unsigned)count);
570 
571 	ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + count);
572 	if (ret < 0)
573 		return ret;
574 
575 	ret = invalidate_inode_pages2_range(inode->i_mapping,
576 					    pos >> PAGE_CACHE_SHIFT,
577 					    (pos + count) >> PAGE_CACHE_SHIFT);
578 	if (ret < 0)
579 		dout("invalidate_inode_pages2_range returned %d\n", ret);
580 
581 	flags = CEPH_OSD_FLAG_ORDERSNAP |
582 		CEPH_OSD_FLAG_ONDISK |
583 		CEPH_OSD_FLAG_WRITE;
584 
585 	iov_iter_init(&i, iov, nr_segs, count, 0);
586 
587 	while (iov_iter_count(&i) > 0) {
588 		void __user *data = i.iov->iov_base + i.iov_offset;
589 		u64 len = i.iov->iov_len - i.iov_offset;
590 
591 		page_align = (unsigned long)data & ~PAGE_MASK;
592 
593 		snapc = ci->i_snap_realm->cached_context;
594 		vino = ceph_vino(inode);
595 		req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
596 					    vino, pos, &len,
597 					    2,/*include a 'startsync' command*/
598 					    CEPH_OSD_OP_WRITE, flags, snapc,
599 					    ci->i_truncate_seq,
600 					    ci->i_truncate_size,
601 					    false);
602 		if (IS_ERR(req)) {
603 			ret = PTR_ERR(req);
604 			break;
605 		}
606 
607 		num_pages = calc_pages_for(page_align, len);
608 		pages = ceph_get_direct_page_vector(data, num_pages, false);
609 		if (IS_ERR(pages)) {
610 			ret = PTR_ERR(pages);
611 			goto out;
612 		}
613 
614 		/*
615 		 * throw out any page cache pages in this range. this
616 		 * may block.
617 		 */
618 		truncate_inode_pages_range(inode->i_mapping, pos,
619 				   (pos+len) | (PAGE_CACHE_SIZE-1));
620 		osd_req_op_extent_osd_data_pages(req, 0, pages, len, page_align,
621 						false, false);
622 
623 		/* BUG_ON(vino.snap != CEPH_NOSNAP); */
624 		ceph_osdc_build_request(req, pos, snapc, vino.snap, &mtime);
625 
626 		ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
627 		if (!ret)
628 			ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
629 
630 		ceph_put_page_vector(pages, num_pages, false);
631 
632 out:
633 		ceph_osdc_put_request(req);
634 		if (ret == 0) {
635 			pos += len;
636 			written += len;
637 			iov_iter_advance(&i, (size_t)len);
638 
639 			if (pos > i_size_read(inode)) {
640 				check_caps = ceph_inode_set_size(inode, pos);
641 				if (check_caps)
642 					ceph_check_caps(ceph_inode(inode),
643 							CHECK_CAPS_AUTHONLY,
644 							NULL);
645 			}
646 		} else
647 			break;
648 	}
649 
650 	if (ret != -EOLDSNAPC && written > 0) {
651 		iocb->ki_pos = pos;
652 		ret = written;
653 	}
654 	return ret;
655 }
656 
657 
658 /*
659  * Synchronous write, straight from __user pointer or user pages.
660  *
661  * If write spans object boundary, just do multiple writes.  (For a
662  * correct atomic write, we should e.g. take write locks on all
663  * objects, rollback on failure, etc.)
664  */
665 static ssize_t ceph_sync_write(struct kiocb *iocb, const struct iovec *iov,
666 			       unsigned long nr_segs, size_t count)
667 {
668 	struct file *file = iocb->ki_filp;
669 	struct inode *inode = file_inode(file);
670 	struct ceph_inode_info *ci = ceph_inode(inode);
671 	struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
672 	struct ceph_snap_context *snapc;
673 	struct ceph_vino vino;
674 	struct ceph_osd_request *req;
675 	struct page **pages;
676 	u64 len;
677 	int num_pages;
678 	int written = 0;
679 	int flags;
680 	int check_caps = 0;
681 	int ret;
682 	struct timespec mtime = CURRENT_TIME;
683 	loff_t pos = iocb->ki_pos;
684 	struct iov_iter i;
685 
686 	if (ceph_snap(file_inode(file)) != CEPH_NOSNAP)
687 		return -EROFS;
688 
689 	dout("sync_write on file %p %lld~%u\n", file, pos, (unsigned)count);
690 
691 	ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + count);
692 	if (ret < 0)
693 		return ret;
694 
695 	ret = invalidate_inode_pages2_range(inode->i_mapping,
696 					    pos >> PAGE_CACHE_SHIFT,
697 					    (pos + count) >> PAGE_CACHE_SHIFT);
698 	if (ret < 0)
699 		dout("invalidate_inode_pages2_range returned %d\n", ret);
700 
701 	flags = CEPH_OSD_FLAG_ORDERSNAP |
702 		CEPH_OSD_FLAG_ONDISK |
703 		CEPH_OSD_FLAG_WRITE |
704 		CEPH_OSD_FLAG_ACK;
705 
706 	iov_iter_init(&i, iov, nr_segs, count, 0);
707 
708 	while ((len = iov_iter_count(&i)) > 0) {
709 		size_t left;
710 		int n;
711 
712 		snapc = ci->i_snap_realm->cached_context;
713 		vino = ceph_vino(inode);
714 		req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
715 					    vino, pos, &len, 1,
716 					    CEPH_OSD_OP_WRITE, flags, snapc,
717 					    ci->i_truncate_seq,
718 					    ci->i_truncate_size,
719 					    false);
720 		if (IS_ERR(req)) {
721 			ret = PTR_ERR(req);
722 			break;
723 		}
724 
725 		/*
726 		 * write from beginning of first page,
727 		 * regardless of io alignment
728 		 */
729 		num_pages = (len + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
730 
731 		pages = ceph_alloc_page_vector(num_pages, GFP_NOFS);
732 		if (IS_ERR(pages)) {
733 			ret = PTR_ERR(pages);
734 			goto out;
735 		}
736 
737 		left = len;
738 		for (n = 0; n < num_pages; n++) {
739 			size_t plen = min_t(size_t, left, PAGE_SIZE);
740 			ret = iov_iter_copy_from_user(pages[n], &i, 0, plen);
741 			if (ret != plen) {
742 				ret = -EFAULT;
743 				break;
744 			}
745 			left -= ret;
746 			iov_iter_advance(&i, ret);
747 		}
748 
749 		if (ret < 0) {
750 			ceph_release_page_vector(pages, num_pages);
751 			goto out;
752 		}
753 
754 		/* get a second commit callback */
755 		req->r_unsafe_callback = ceph_sync_write_unsafe;
756 		req->r_inode = inode;
757 
758 		osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0,
759 						false, true);
760 
761 		/* BUG_ON(vino.snap != CEPH_NOSNAP); */
762 		ceph_osdc_build_request(req, pos, snapc, vino.snap, &mtime);
763 
764 		ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
765 		if (!ret)
766 			ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
767 
768 out:
769 		ceph_osdc_put_request(req);
770 		if (ret == 0) {
771 			pos += len;
772 			written += len;
773 
774 			if (pos > i_size_read(inode)) {
775 				check_caps = ceph_inode_set_size(inode, pos);
776 				if (check_caps)
777 					ceph_check_caps(ceph_inode(inode),
778 							CHECK_CAPS_AUTHONLY,
779 							NULL);
780 			}
781 		} else
782 			break;
783 	}
784 
785 	if (ret != -EOLDSNAPC && written > 0) {
786 		ret = written;
787 		iocb->ki_pos = pos;
788 	}
789 	return ret;
790 }
791 
792 /*
793  * Wrap generic_file_aio_read with checks for cap bits on the inode.
794  * Atomically grab references, so that those bits are not released
795  * back to the MDS mid-read.
796  *
797  * Hmm, the sync read case isn't actually async... should it be?
798  */
799 static ssize_t ceph_aio_read(struct kiocb *iocb, const struct iovec *iov,
800 			     unsigned long nr_segs, loff_t pos)
801 {
802 	struct file *filp = iocb->ki_filp;
803 	struct ceph_file_info *fi = filp->private_data;
804 	size_t len = iocb->ki_nbytes;
805 	struct inode *inode = file_inode(filp);
806 	struct ceph_inode_info *ci = ceph_inode(inode);
807 	ssize_t ret;
808 	int want, got = 0;
809 	int checkeof = 0, read = 0;
810 
811 again:
812 	dout("aio_read %p %llx.%llx %llu~%u trying to get caps on %p\n",
813 	     inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len, inode);
814 
815 	if (fi->fmode & CEPH_FILE_MODE_LAZY)
816 		want = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
817 	else
818 		want = CEPH_CAP_FILE_CACHE;
819 	ret = ceph_get_caps(ci, CEPH_CAP_FILE_RD, want, &got, -1);
820 	if (ret < 0)
821 		return ret;
822 
823 	if ((got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0 ||
824 	    (iocb->ki_filp->f_flags & O_DIRECT) ||
825 	    (fi->flags & CEPH_F_SYNC)) {
826 		struct iov_iter i;
827 
828 		dout("aio_sync_read %p %llx.%llx %llu~%u got cap refs on %s\n",
829 		     inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
830 		     ceph_cap_string(got));
831 
832 		if (!read) {
833 			ret = generic_segment_checks(iov, &nr_segs,
834 							&len, VERIFY_WRITE);
835 			if (ret)
836 				goto out;
837 		}
838 
839 		iov_iter_init(&i, iov, nr_segs, len, read);
840 
841 		/* hmm, this isn't really async... */
842 		ret = ceph_sync_read(iocb, &i, &checkeof);
843 	} else {
844 		/*
845 		 * We can't modify the content of iov,
846 		 * so we only read from beginning.
847 		 */
848 		if (read) {
849 			iocb->ki_pos = pos;
850 			len = iocb->ki_nbytes;
851 			read = 0;
852 		}
853 		dout("aio_read %p %llx.%llx %llu~%u got cap refs on %s\n",
854 		     inode, ceph_vinop(inode), pos, (unsigned)len,
855 		     ceph_cap_string(got));
856 
857 		ret = generic_file_aio_read(iocb, iov, nr_segs, pos);
858 	}
859 out:
860 	dout("aio_read %p %llx.%llx dropping cap refs on %s = %d\n",
861 	     inode, ceph_vinop(inode), ceph_cap_string(got), (int)ret);
862 	ceph_put_cap_refs(ci, got);
863 
864 	if (checkeof && ret >= 0) {
865 		int statret = ceph_do_getattr(inode,
866 					      CEPH_STAT_CAP_SIZE);
867 
868 		/* hit EOF or hole? */
869 		if (statret == 0 && iocb->ki_pos < inode->i_size &&
870 			ret < len) {
871 			dout("sync_read hit hole, ppos %lld < size %lld"
872 			     ", reading more\n", iocb->ki_pos,
873 			     inode->i_size);
874 
875 			read += ret;
876 			len -= ret;
877 			checkeof = 0;
878 			goto again;
879 		}
880 	}
881 
882 	if (ret >= 0)
883 		ret += read;
884 
885 	return ret;
886 }
887 
888 /*
889  * Take cap references to avoid releasing caps to MDS mid-write.
890  *
891  * If we are synchronous, and write with an old snap context, the OSD
892  * may return EOLDSNAPC.  In that case, retry the write.. _after_
893  * dropping our cap refs and allowing the pending snap to logically
894  * complete _before_ this write occurs.
895  *
896  * If we are near ENOSPC, write synchronously.
897  */
898 static ssize_t ceph_aio_write(struct kiocb *iocb, const struct iovec *iov,
899 		       unsigned long nr_segs, loff_t pos)
900 {
901 	struct file *file = iocb->ki_filp;
902 	struct ceph_file_info *fi = file->private_data;
903 	struct inode *inode = file_inode(file);
904 	struct ceph_inode_info *ci = ceph_inode(inode);
905 	struct ceph_osd_client *osdc =
906 		&ceph_sb_to_client(inode->i_sb)->client->osdc;
907 	ssize_t count, written = 0;
908 	int err, want, got;
909 
910 	if (ceph_snap(inode) != CEPH_NOSNAP)
911 		return -EROFS;
912 
913 	mutex_lock(&inode->i_mutex);
914 
915 	err = generic_segment_checks(iov, &nr_segs, &count, VERIFY_READ);
916 	if (err)
917 		goto out;
918 
919 	/* We can write back this queue in page reclaim */
920 	current->backing_dev_info = file->f_mapping->backing_dev_info;
921 
922 	err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode));
923 	if (err)
924 		goto out;
925 
926 	if (count == 0)
927 		goto out;
928 
929 	err = file_remove_suid(file);
930 	if (err)
931 		goto out;
932 
933 	err = file_update_time(file);
934 	if (err)
935 		goto out;
936 
937 retry_snap:
938 	if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL)) {
939 		err = -ENOSPC;
940 		goto out;
941 	}
942 
943 	dout("aio_write %p %llx.%llx %llu~%zd getting caps. i_size %llu\n",
944 	     inode, ceph_vinop(inode), pos, count, inode->i_size);
945 	if (fi->fmode & CEPH_FILE_MODE_LAZY)
946 		want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
947 	else
948 		want = CEPH_CAP_FILE_BUFFER;
949 	got = 0;
950 	err = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, &got, pos + count);
951 	if (err < 0)
952 		goto out;
953 
954 	dout("aio_write %p %llx.%llx %llu~%zd got cap refs on %s\n",
955 	     inode, ceph_vinop(inode), pos, count, ceph_cap_string(got));
956 
957 	if ((got & (CEPH_CAP_FILE_BUFFER|CEPH_CAP_FILE_LAZYIO)) == 0 ||
958 	    (file->f_flags & O_DIRECT) || (fi->flags & CEPH_F_SYNC)) {
959 		mutex_unlock(&inode->i_mutex);
960 		if (file->f_flags & O_DIRECT)
961 			written = ceph_sync_direct_write(iocb, iov,
962 							 nr_segs, count);
963 		else
964 			written = ceph_sync_write(iocb, iov, nr_segs, count);
965 		if (written == -EOLDSNAPC) {
966 			dout("aio_write %p %llx.%llx %llu~%u"
967 				"got EOLDSNAPC, retrying\n",
968 				inode, ceph_vinop(inode),
969 				pos, (unsigned)iov->iov_len);
970 			mutex_lock(&inode->i_mutex);
971 			goto retry_snap;
972 		}
973 	} else {
974 		loff_t old_size = inode->i_size;
975 		struct iov_iter from;
976 		/*
977 		 * No need to acquire the i_truncate_mutex. Because
978 		 * the MDS revokes Fwb caps before sending truncate
979 		 * message to us. We can't get Fwb cap while there
980 		 * are pending vmtruncate. So write and vmtruncate
981 		 * can not run at the same time
982 		 */
983 		iov_iter_init(&from, iov, nr_segs, count, 0);
984 		written = generic_perform_write(file, &from, pos);
985 		if (likely(written >= 0))
986 			iocb->ki_pos = pos + written;
987 		if (inode->i_size > old_size)
988 			ceph_fscache_update_objectsize(inode);
989 		mutex_unlock(&inode->i_mutex);
990 	}
991 
992 	if (written >= 0) {
993 		int dirty;
994 		spin_lock(&ci->i_ceph_lock);
995 		dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR);
996 		spin_unlock(&ci->i_ceph_lock);
997 		if (dirty)
998 			__mark_inode_dirty(inode, dirty);
999 	}
1000 
1001 	dout("aio_write %p %llx.%llx %llu~%u  dropping cap refs on %s\n",
1002 	     inode, ceph_vinop(inode), pos, (unsigned)iov->iov_len,
1003 	     ceph_cap_string(got));
1004 	ceph_put_cap_refs(ci, got);
1005 
1006 	if (written >= 0 &&
1007 	    ((file->f_flags & O_SYNC) || IS_SYNC(file->f_mapping->host) ||
1008 	     ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_NEARFULL))) {
1009 		err = vfs_fsync_range(file, pos, pos + written - 1, 1);
1010 		if (err < 0)
1011 			written = err;
1012 	}
1013 
1014 	goto out_unlocked;
1015 
1016 out:
1017 	mutex_unlock(&inode->i_mutex);
1018 out_unlocked:
1019 	current->backing_dev_info = NULL;
1020 	return written ? written : err;
1021 }
1022 
1023 /*
1024  * llseek.  be sure to verify file size on SEEK_END.
1025  */
1026 static loff_t ceph_llseek(struct file *file, loff_t offset, int whence)
1027 {
1028 	struct inode *inode = file->f_mapping->host;
1029 	int ret;
1030 
1031 	mutex_lock(&inode->i_mutex);
1032 
1033 	if (whence == SEEK_END || whence == SEEK_DATA || whence == SEEK_HOLE) {
1034 		ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE);
1035 		if (ret < 0) {
1036 			offset = ret;
1037 			goto out;
1038 		}
1039 	}
1040 
1041 	switch (whence) {
1042 	case SEEK_END:
1043 		offset += inode->i_size;
1044 		break;
1045 	case SEEK_CUR:
1046 		/*
1047 		 * Here we special-case the lseek(fd, 0, SEEK_CUR)
1048 		 * position-querying operation.  Avoid rewriting the "same"
1049 		 * f_pos value back to the file because a concurrent read(),
1050 		 * write() or lseek() might have altered it
1051 		 */
1052 		if (offset == 0) {
1053 			offset = file->f_pos;
1054 			goto out;
1055 		}
1056 		offset += file->f_pos;
1057 		break;
1058 	case SEEK_DATA:
1059 		if (offset >= inode->i_size) {
1060 			ret = -ENXIO;
1061 			goto out;
1062 		}
1063 		break;
1064 	case SEEK_HOLE:
1065 		if (offset >= inode->i_size) {
1066 			ret = -ENXIO;
1067 			goto out;
1068 		}
1069 		offset = inode->i_size;
1070 		break;
1071 	}
1072 
1073 	offset = vfs_setpos(file, offset, inode->i_sb->s_maxbytes);
1074 
1075 out:
1076 	mutex_unlock(&inode->i_mutex);
1077 	return offset;
1078 }
1079 
1080 static inline void ceph_zero_partial_page(
1081 	struct inode *inode, loff_t offset, unsigned size)
1082 {
1083 	struct page *page;
1084 	pgoff_t index = offset >> PAGE_CACHE_SHIFT;
1085 
1086 	page = find_lock_page(inode->i_mapping, index);
1087 	if (page) {
1088 		wait_on_page_writeback(page);
1089 		zero_user(page, offset & (PAGE_CACHE_SIZE - 1), size);
1090 		unlock_page(page);
1091 		page_cache_release(page);
1092 	}
1093 }
1094 
1095 static void ceph_zero_pagecache_range(struct inode *inode, loff_t offset,
1096 				      loff_t length)
1097 {
1098 	loff_t nearly = round_up(offset, PAGE_CACHE_SIZE);
1099 	if (offset < nearly) {
1100 		loff_t size = nearly - offset;
1101 		if (length < size)
1102 			size = length;
1103 		ceph_zero_partial_page(inode, offset, size);
1104 		offset += size;
1105 		length -= size;
1106 	}
1107 	if (length >= PAGE_CACHE_SIZE) {
1108 		loff_t size = round_down(length, PAGE_CACHE_SIZE);
1109 		truncate_pagecache_range(inode, offset, offset + size - 1);
1110 		offset += size;
1111 		length -= size;
1112 	}
1113 	if (length)
1114 		ceph_zero_partial_page(inode, offset, length);
1115 }
1116 
1117 static int ceph_zero_partial_object(struct inode *inode,
1118 				    loff_t offset, loff_t *length)
1119 {
1120 	struct ceph_inode_info *ci = ceph_inode(inode);
1121 	struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1122 	struct ceph_osd_request *req;
1123 	int ret = 0;
1124 	loff_t zero = 0;
1125 	int op;
1126 
1127 	if (!length) {
1128 		op = offset ? CEPH_OSD_OP_DELETE : CEPH_OSD_OP_TRUNCATE;
1129 		length = &zero;
1130 	} else {
1131 		op = CEPH_OSD_OP_ZERO;
1132 	}
1133 
1134 	req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1135 					ceph_vino(inode),
1136 					offset, length,
1137 					1, op,
1138 					CEPH_OSD_FLAG_WRITE |
1139 					CEPH_OSD_FLAG_ONDISK,
1140 					NULL, 0, 0, false);
1141 	if (IS_ERR(req)) {
1142 		ret = PTR_ERR(req);
1143 		goto out;
1144 	}
1145 
1146 	ceph_osdc_build_request(req, offset, NULL, ceph_vino(inode).snap,
1147 				&inode->i_mtime);
1148 
1149 	ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
1150 	if (!ret) {
1151 		ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
1152 		if (ret == -ENOENT)
1153 			ret = 0;
1154 	}
1155 	ceph_osdc_put_request(req);
1156 
1157 out:
1158 	return ret;
1159 }
1160 
1161 static int ceph_zero_objects(struct inode *inode, loff_t offset, loff_t length)
1162 {
1163 	int ret = 0;
1164 	struct ceph_inode_info *ci = ceph_inode(inode);
1165 	s32 stripe_unit = ceph_file_layout_su(ci->i_layout);
1166 	s32 stripe_count = ceph_file_layout_stripe_count(ci->i_layout);
1167 	s32 object_size = ceph_file_layout_object_size(ci->i_layout);
1168 	u64 object_set_size = object_size * stripe_count;
1169 	u64 nearly, t;
1170 
1171 	/* round offset up to next period boundary */
1172 	nearly = offset + object_set_size - 1;
1173 	t = nearly;
1174 	nearly -= do_div(t, object_set_size);
1175 
1176 	while (length && offset < nearly) {
1177 		loff_t size = length;
1178 		ret = ceph_zero_partial_object(inode, offset, &size);
1179 		if (ret < 0)
1180 			return ret;
1181 		offset += size;
1182 		length -= size;
1183 	}
1184 	while (length >= object_set_size) {
1185 		int i;
1186 		loff_t pos = offset;
1187 		for (i = 0; i < stripe_count; ++i) {
1188 			ret = ceph_zero_partial_object(inode, pos, NULL);
1189 			if (ret < 0)
1190 				return ret;
1191 			pos += stripe_unit;
1192 		}
1193 		offset += object_set_size;
1194 		length -= object_set_size;
1195 	}
1196 	while (length) {
1197 		loff_t size = length;
1198 		ret = ceph_zero_partial_object(inode, offset, &size);
1199 		if (ret < 0)
1200 			return ret;
1201 		offset += size;
1202 		length -= size;
1203 	}
1204 	return ret;
1205 }
1206 
1207 static long ceph_fallocate(struct file *file, int mode,
1208 				loff_t offset, loff_t length)
1209 {
1210 	struct ceph_file_info *fi = file->private_data;
1211 	struct inode *inode = file_inode(file);
1212 	struct ceph_inode_info *ci = ceph_inode(inode);
1213 	struct ceph_osd_client *osdc =
1214 		&ceph_inode_to_client(inode)->client->osdc;
1215 	int want, got = 0;
1216 	int dirty;
1217 	int ret = 0;
1218 	loff_t endoff = 0;
1219 	loff_t size;
1220 
1221 	if (!S_ISREG(inode->i_mode))
1222 		return -EOPNOTSUPP;
1223 
1224 	if (IS_SWAPFILE(inode))
1225 		return -ETXTBSY;
1226 
1227 	mutex_lock(&inode->i_mutex);
1228 
1229 	if (ceph_snap(inode) != CEPH_NOSNAP) {
1230 		ret = -EROFS;
1231 		goto unlock;
1232 	}
1233 
1234 	if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL) &&
1235 		!(mode & FALLOC_FL_PUNCH_HOLE)) {
1236 		ret = -ENOSPC;
1237 		goto unlock;
1238 	}
1239 
1240 	size = i_size_read(inode);
1241 	if (!(mode & FALLOC_FL_KEEP_SIZE))
1242 		endoff = offset + length;
1243 
1244 	if (fi->fmode & CEPH_FILE_MODE_LAZY)
1245 		want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
1246 	else
1247 		want = CEPH_CAP_FILE_BUFFER;
1248 
1249 	ret = ceph_get_caps(ci, CEPH_CAP_FILE_WR, want, &got, endoff);
1250 	if (ret < 0)
1251 		goto unlock;
1252 
1253 	if (mode & FALLOC_FL_PUNCH_HOLE) {
1254 		if (offset < size)
1255 			ceph_zero_pagecache_range(inode, offset, length);
1256 		ret = ceph_zero_objects(inode, offset, length);
1257 	} else if (endoff > size) {
1258 		truncate_pagecache_range(inode, size, -1);
1259 		if (ceph_inode_set_size(inode, endoff))
1260 			ceph_check_caps(ceph_inode(inode),
1261 				CHECK_CAPS_AUTHONLY, NULL);
1262 	}
1263 
1264 	if (!ret) {
1265 		spin_lock(&ci->i_ceph_lock);
1266 		dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR);
1267 		spin_unlock(&ci->i_ceph_lock);
1268 		if (dirty)
1269 			__mark_inode_dirty(inode, dirty);
1270 	}
1271 
1272 	ceph_put_cap_refs(ci, got);
1273 unlock:
1274 	mutex_unlock(&inode->i_mutex);
1275 	return ret;
1276 }
1277 
1278 const struct file_operations ceph_file_fops = {
1279 	.open = ceph_open,
1280 	.release = ceph_release,
1281 	.llseek = ceph_llseek,
1282 	.read = do_sync_read,
1283 	.write = do_sync_write,
1284 	.aio_read = ceph_aio_read,
1285 	.aio_write = ceph_aio_write,
1286 	.mmap = ceph_mmap,
1287 	.fsync = ceph_fsync,
1288 	.lock = ceph_lock,
1289 	.flock = ceph_flock,
1290 	.splice_read = generic_file_splice_read,
1291 	.splice_write = generic_file_splice_write,
1292 	.unlocked_ioctl = ceph_ioctl,
1293 	.compat_ioctl	= ceph_ioctl,
1294 	.fallocate	= ceph_fallocate,
1295 };
1296 
1297