1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/ceph/ceph_debug.h>
3 #include <linux/ceph/striper.h>
4 
5 #include <linux/module.h>
6 #include <linux/sched.h>
7 #include <linux/slab.h>
8 #include <linux/file.h>
9 #include <linux/mount.h>
10 #include <linux/namei.h>
11 #include <linux/writeback.h>
12 #include <linux/falloc.h>
13 #include <linux/iversion.h>
14 #include <linux/ktime.h>
15 
16 #include "super.h"
17 #include "mds_client.h"
18 #include "cache.h"
19 #include "io.h"
20 #include "metric.h"
21 
ceph_flags_sys2wire(u32 flags)22 static __le32 ceph_flags_sys2wire(u32 flags)
23 {
24 	u32 wire_flags = 0;
25 
26 	switch (flags & O_ACCMODE) {
27 	case O_RDONLY:
28 		wire_flags |= CEPH_O_RDONLY;
29 		break;
30 	case O_WRONLY:
31 		wire_flags |= CEPH_O_WRONLY;
32 		break;
33 	case O_RDWR:
34 		wire_flags |= CEPH_O_RDWR;
35 		break;
36 	}
37 
38 	flags &= ~O_ACCMODE;
39 
40 #define ceph_sys2wire(a) if (flags & a) { wire_flags |= CEPH_##a; flags &= ~a; }
41 
42 	ceph_sys2wire(O_CREAT);
43 	ceph_sys2wire(O_EXCL);
44 	ceph_sys2wire(O_TRUNC);
45 	ceph_sys2wire(O_DIRECTORY);
46 	ceph_sys2wire(O_NOFOLLOW);
47 
48 #undef ceph_sys2wire
49 
50 	if (flags)
51 		dout("unused open flags: %x\n", flags);
52 
53 	return cpu_to_le32(wire_flags);
54 }
55 
56 /*
57  * Ceph file operations
58  *
59  * Implement basic open/close functionality, and implement
60  * read/write.
61  *
62  * We implement three modes of file I/O:
63  *  - buffered uses the generic_file_aio_{read,write} helpers
64  *
65  *  - synchronous is used when there is multi-client read/write
66  *    sharing, avoids the page cache, and synchronously waits for an
67  *    ack from the OSD.
68  *
69  *  - direct io takes the variant of the sync path that references
70  *    user pages directly.
71  *
72  * fsync() flushes and waits on dirty pages, but just queues metadata
73  * for writeback: since the MDS can recover size and mtime there is no
74  * need to wait for MDS acknowledgement.
75  */
76 
77 /*
78  * How many pages to get in one call to iov_iter_get_pages().  This
79  * determines the size of the on-stack array used as a buffer.
80  */
81 #define ITER_GET_BVECS_PAGES	64
82 
__iter_get_bvecs(struct iov_iter * iter,size_t maxsize,struct bio_vec * bvecs)83 static ssize_t __iter_get_bvecs(struct iov_iter *iter, size_t maxsize,
84 				struct bio_vec *bvecs)
85 {
86 	size_t size = 0;
87 	int bvec_idx = 0;
88 
89 	if (maxsize > iov_iter_count(iter))
90 		maxsize = iov_iter_count(iter);
91 
92 	while (size < maxsize) {
93 		struct page *pages[ITER_GET_BVECS_PAGES];
94 		ssize_t bytes;
95 		size_t start;
96 		int idx = 0;
97 
98 		bytes = iov_iter_get_pages2(iter, pages, maxsize - size,
99 					   ITER_GET_BVECS_PAGES, &start);
100 		if (bytes < 0)
101 			return size ?: bytes;
102 
103 		size += bytes;
104 
105 		for ( ; bytes; idx++, bvec_idx++) {
106 			struct bio_vec bv = {
107 				.bv_page = pages[idx],
108 				.bv_len = min_t(int, bytes, PAGE_SIZE - start),
109 				.bv_offset = start,
110 			};
111 
112 			bvecs[bvec_idx] = bv;
113 			bytes -= bv.bv_len;
114 			start = 0;
115 		}
116 	}
117 
118 	return size;
119 }
120 
121 /*
122  * iov_iter_get_pages() only considers one iov_iter segment, no matter
123  * what maxsize or maxpages are given.  For ITER_BVEC that is a single
124  * page.
125  *
126  * Attempt to get up to @maxsize bytes worth of pages from @iter.
127  * Return the number of bytes in the created bio_vec array, or an error.
128  */
iter_get_bvecs_alloc(struct iov_iter * iter,size_t maxsize,struct bio_vec ** bvecs,int * num_bvecs)129 static ssize_t iter_get_bvecs_alloc(struct iov_iter *iter, size_t maxsize,
130 				    struct bio_vec **bvecs, int *num_bvecs)
131 {
132 	struct bio_vec *bv;
133 	size_t orig_count = iov_iter_count(iter);
134 	ssize_t bytes;
135 	int npages;
136 
137 	iov_iter_truncate(iter, maxsize);
138 	npages = iov_iter_npages(iter, INT_MAX);
139 	iov_iter_reexpand(iter, orig_count);
140 
141 	/*
142 	 * __iter_get_bvecs() may populate only part of the array -- zero it
143 	 * out.
144 	 */
145 	bv = kvmalloc_array(npages, sizeof(*bv), GFP_KERNEL | __GFP_ZERO);
146 	if (!bv)
147 		return -ENOMEM;
148 
149 	bytes = __iter_get_bvecs(iter, maxsize, bv);
150 	if (bytes < 0) {
151 		/*
152 		 * No pages were pinned -- just free the array.
153 		 */
154 		kvfree(bv);
155 		return bytes;
156 	}
157 
158 	*bvecs = bv;
159 	*num_bvecs = npages;
160 	return bytes;
161 }
162 
put_bvecs(struct bio_vec * bvecs,int num_bvecs,bool should_dirty)163 static void put_bvecs(struct bio_vec *bvecs, int num_bvecs, bool should_dirty)
164 {
165 	int i;
166 
167 	for (i = 0; i < num_bvecs; i++) {
168 		if (bvecs[i].bv_page) {
169 			if (should_dirty)
170 				set_page_dirty_lock(bvecs[i].bv_page);
171 			put_page(bvecs[i].bv_page);
172 		}
173 	}
174 	kvfree(bvecs);
175 }
176 
177 /*
178  * Prepare an open request.  Preallocate ceph_cap to avoid an
179  * inopportune ENOMEM later.
180  */
181 static struct ceph_mds_request *
prepare_open_request(struct super_block * sb,int flags,int create_mode)182 prepare_open_request(struct super_block *sb, int flags, int create_mode)
183 {
184 	struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(sb);
185 	struct ceph_mds_request *req;
186 	int want_auth = USE_ANY_MDS;
187 	int op = (flags & O_CREAT) ? CEPH_MDS_OP_CREATE : CEPH_MDS_OP_OPEN;
188 
189 	if (flags & (O_WRONLY|O_RDWR|O_CREAT|O_TRUNC))
190 		want_auth = USE_AUTH_MDS;
191 
192 	req = ceph_mdsc_create_request(mdsc, op, want_auth);
193 	if (IS_ERR(req))
194 		goto out;
195 	req->r_fmode = ceph_flags_to_mode(flags);
196 	req->r_args.open.flags = ceph_flags_sys2wire(flags);
197 	req->r_args.open.mode = cpu_to_le32(create_mode);
198 out:
199 	return req;
200 }
201 
ceph_init_file_info(struct inode * inode,struct file * file,int fmode,bool isdir)202 static int ceph_init_file_info(struct inode *inode, struct file *file,
203 					int fmode, bool isdir)
204 {
205 	struct ceph_inode_info *ci = ceph_inode(inode);
206 	struct ceph_mount_options *opt =
207 		ceph_inode_to_client(&ci->netfs.inode)->mount_options;
208 	struct ceph_file_info *fi;
209 	int ret;
210 
211 	dout("%s %p %p 0%o (%s)\n", __func__, inode, file,
212 			inode->i_mode, isdir ? "dir" : "regular");
213 	BUG_ON(inode->i_fop->release != ceph_release);
214 
215 	if (isdir) {
216 		struct ceph_dir_file_info *dfi =
217 			kmem_cache_zalloc(ceph_dir_file_cachep, GFP_KERNEL);
218 		if (!dfi)
219 			return -ENOMEM;
220 
221 		file->private_data = dfi;
222 		fi = &dfi->file_info;
223 		dfi->next_offset = 2;
224 		dfi->readdir_cache_idx = -1;
225 	} else {
226 		fi = kmem_cache_zalloc(ceph_file_cachep, GFP_KERNEL);
227 		if (!fi)
228 			return -ENOMEM;
229 
230 		if (opt->flags & CEPH_MOUNT_OPT_NOPAGECACHE)
231 			fi->flags |= CEPH_F_SYNC;
232 
233 		file->private_data = fi;
234 	}
235 
236 	ceph_get_fmode(ci, fmode, 1);
237 	fi->fmode = fmode;
238 
239 	spin_lock_init(&fi->rw_contexts_lock);
240 	INIT_LIST_HEAD(&fi->rw_contexts);
241 	fi->filp_gen = READ_ONCE(ceph_inode_to_client(inode)->filp_gen);
242 
243 	if ((file->f_mode & FMODE_WRITE) && ceph_has_inline_data(ci)) {
244 		ret = ceph_uninline_data(file);
245 		if (ret < 0)
246 			goto error;
247 	}
248 
249 	return 0;
250 
251 error:
252 	ceph_fscache_unuse_cookie(inode, file->f_mode & FMODE_WRITE);
253 	ceph_put_fmode(ci, fi->fmode, 1);
254 	kmem_cache_free(ceph_file_cachep, fi);
255 	/* wake up anyone waiting for caps on this inode */
256 	wake_up_all(&ci->i_cap_wq);
257 	return ret;
258 }
259 
260 /*
261  * initialize private struct file data.
262  * if we fail, clean up by dropping fmode reference on the ceph_inode
263  */
ceph_init_file(struct inode * inode,struct file * file,int fmode)264 static int ceph_init_file(struct inode *inode, struct file *file, int fmode)
265 {
266 	int ret = 0;
267 
268 	switch (inode->i_mode & S_IFMT) {
269 	case S_IFREG:
270 		ceph_fscache_use_cookie(inode, file->f_mode & FMODE_WRITE);
271 		fallthrough;
272 	case S_IFDIR:
273 		ret = ceph_init_file_info(inode, file, fmode,
274 						S_ISDIR(inode->i_mode));
275 		break;
276 
277 	case S_IFLNK:
278 		dout("init_file %p %p 0%o (symlink)\n", inode, file,
279 		     inode->i_mode);
280 		break;
281 
282 	default:
283 		dout("init_file %p %p 0%o (special)\n", inode, file,
284 		     inode->i_mode);
285 		/*
286 		 * we need to drop the open ref now, since we don't
287 		 * have .release set to ceph_release.
288 		 */
289 		BUG_ON(inode->i_fop->release == ceph_release);
290 
291 		/* call the proper open fop */
292 		ret = inode->i_fop->open(inode, file);
293 	}
294 	return ret;
295 }
296 
297 /*
298  * try renew caps after session gets killed.
299  */
ceph_renew_caps(struct inode * inode,int fmode)300 int ceph_renew_caps(struct inode *inode, int fmode)
301 {
302 	struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
303 	struct ceph_inode_info *ci = ceph_inode(inode);
304 	struct ceph_mds_request *req;
305 	int err, flags, wanted;
306 
307 	spin_lock(&ci->i_ceph_lock);
308 	__ceph_touch_fmode(ci, mdsc, fmode);
309 	wanted = __ceph_caps_file_wanted(ci);
310 	if (__ceph_is_any_real_caps(ci) &&
311 	    (!(wanted & CEPH_CAP_ANY_WR) || ci->i_auth_cap)) {
312 		int issued = __ceph_caps_issued(ci, NULL);
313 		spin_unlock(&ci->i_ceph_lock);
314 		dout("renew caps %p want %s issued %s updating mds_wanted\n",
315 		     inode, ceph_cap_string(wanted), ceph_cap_string(issued));
316 		ceph_check_caps(ci, 0, NULL);
317 		return 0;
318 	}
319 	spin_unlock(&ci->i_ceph_lock);
320 
321 	flags = 0;
322 	if ((wanted & CEPH_CAP_FILE_RD) && (wanted & CEPH_CAP_FILE_WR))
323 		flags = O_RDWR;
324 	else if (wanted & CEPH_CAP_FILE_RD)
325 		flags = O_RDONLY;
326 	else if (wanted & CEPH_CAP_FILE_WR)
327 		flags = O_WRONLY;
328 #ifdef O_LAZY
329 	if (wanted & CEPH_CAP_FILE_LAZYIO)
330 		flags |= O_LAZY;
331 #endif
332 
333 	req = prepare_open_request(inode->i_sb, flags, 0);
334 	if (IS_ERR(req)) {
335 		err = PTR_ERR(req);
336 		goto out;
337 	}
338 
339 	req->r_inode = inode;
340 	ihold(inode);
341 	req->r_num_caps = 1;
342 
343 	err = ceph_mdsc_do_request(mdsc, NULL, req);
344 	ceph_mdsc_put_request(req);
345 out:
346 	dout("renew caps %p open result=%d\n", inode, err);
347 	return err < 0 ? err : 0;
348 }
349 
350 /*
351  * If we already have the requisite capabilities, we can satisfy
352  * the open request locally (no need to request new caps from the
353  * MDS).  We do, however, need to inform the MDS (asynchronously)
354  * if our wanted caps set expands.
355  */
ceph_open(struct inode * inode,struct file * file)356 int ceph_open(struct inode *inode, struct file *file)
357 {
358 	struct ceph_inode_info *ci = ceph_inode(inode);
359 	struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
360 	struct ceph_mds_client *mdsc = fsc->mdsc;
361 	struct ceph_mds_request *req;
362 	struct ceph_file_info *fi = file->private_data;
363 	int err;
364 	int flags, fmode, wanted;
365 
366 	if (fi) {
367 		dout("open file %p is already opened\n", file);
368 		return 0;
369 	}
370 
371 	/* filter out O_CREAT|O_EXCL; vfs did that already.  yuck. */
372 	flags = file->f_flags & ~(O_CREAT|O_EXCL);
373 	if (S_ISDIR(inode->i_mode))
374 		flags = O_DIRECTORY;  /* mds likes to know */
375 
376 	dout("open inode %p ino %llx.%llx file %p flags %d (%d)\n", inode,
377 	     ceph_vinop(inode), file, flags, file->f_flags);
378 	fmode = ceph_flags_to_mode(flags);
379 	wanted = ceph_caps_for_mode(fmode);
380 
381 	/* snapped files are read-only */
382 	if (ceph_snap(inode) != CEPH_NOSNAP && (file->f_mode & FMODE_WRITE))
383 		return -EROFS;
384 
385 	/* trivially open snapdir */
386 	if (ceph_snap(inode) == CEPH_SNAPDIR) {
387 		return ceph_init_file(inode, file, fmode);
388 	}
389 
390 	/*
391 	 * No need to block if we have caps on the auth MDS (for
392 	 * write) or any MDS (for read).  Update wanted set
393 	 * asynchronously.
394 	 */
395 	spin_lock(&ci->i_ceph_lock);
396 	if (__ceph_is_any_real_caps(ci) &&
397 	    (((fmode & CEPH_FILE_MODE_WR) == 0) || ci->i_auth_cap)) {
398 		int mds_wanted = __ceph_caps_mds_wanted(ci, true);
399 		int issued = __ceph_caps_issued(ci, NULL);
400 
401 		dout("open %p fmode %d want %s issued %s using existing\n",
402 		     inode, fmode, ceph_cap_string(wanted),
403 		     ceph_cap_string(issued));
404 		__ceph_touch_fmode(ci, mdsc, fmode);
405 		spin_unlock(&ci->i_ceph_lock);
406 
407 		/* adjust wanted? */
408 		if ((issued & wanted) != wanted &&
409 		    (mds_wanted & wanted) != wanted &&
410 		    ceph_snap(inode) != CEPH_SNAPDIR)
411 			ceph_check_caps(ci, 0, NULL);
412 
413 		return ceph_init_file(inode, file, fmode);
414 	} else if (ceph_snap(inode) != CEPH_NOSNAP &&
415 		   (ci->i_snap_caps & wanted) == wanted) {
416 		__ceph_touch_fmode(ci, mdsc, fmode);
417 		spin_unlock(&ci->i_ceph_lock);
418 		return ceph_init_file(inode, file, fmode);
419 	}
420 
421 	spin_unlock(&ci->i_ceph_lock);
422 
423 	dout("open fmode %d wants %s\n", fmode, ceph_cap_string(wanted));
424 	req = prepare_open_request(inode->i_sb, flags, 0);
425 	if (IS_ERR(req)) {
426 		err = PTR_ERR(req);
427 		goto out;
428 	}
429 	req->r_inode = inode;
430 	ihold(inode);
431 
432 	req->r_num_caps = 1;
433 	err = ceph_mdsc_do_request(mdsc, NULL, req);
434 	if (!err)
435 		err = ceph_init_file(inode, file, req->r_fmode);
436 	ceph_mdsc_put_request(req);
437 	dout("open result=%d on %llx.%llx\n", err, ceph_vinop(inode));
438 out:
439 	return err;
440 }
441 
442 /* Clone the layout from a synchronous create, if the dir now has Dc caps */
443 static void
cache_file_layout(struct inode * dst,struct inode * src)444 cache_file_layout(struct inode *dst, struct inode *src)
445 {
446 	struct ceph_inode_info *cdst = ceph_inode(dst);
447 	struct ceph_inode_info *csrc = ceph_inode(src);
448 
449 	spin_lock(&cdst->i_ceph_lock);
450 	if ((__ceph_caps_issued(cdst, NULL) & CEPH_CAP_DIR_CREATE) &&
451 	    !ceph_file_layout_is_valid(&cdst->i_cached_layout)) {
452 		memcpy(&cdst->i_cached_layout, &csrc->i_layout,
453 			sizeof(cdst->i_cached_layout));
454 		rcu_assign_pointer(cdst->i_cached_layout.pool_ns,
455 				   ceph_try_get_string(csrc->i_layout.pool_ns));
456 	}
457 	spin_unlock(&cdst->i_ceph_lock);
458 }
459 
460 /*
461  * Try to set up an async create. We need caps, a file layout, and inode number,
462  * and either a lease on the dentry or complete dir info. If any of those
463  * criteria are not satisfied, then return false and the caller can go
464  * synchronous.
465  */
try_prep_async_create(struct inode * dir,struct dentry * dentry,struct ceph_file_layout * lo,u64 * pino)466 static int try_prep_async_create(struct inode *dir, struct dentry *dentry,
467 				 struct ceph_file_layout *lo, u64 *pino)
468 {
469 	struct ceph_inode_info *ci = ceph_inode(dir);
470 	struct ceph_dentry_info *di = ceph_dentry(dentry);
471 	int got = 0, want = CEPH_CAP_FILE_EXCL | CEPH_CAP_DIR_CREATE;
472 	u64 ino;
473 
474 	spin_lock(&ci->i_ceph_lock);
475 	/* No auth cap means no chance for Dc caps */
476 	if (!ci->i_auth_cap)
477 		goto no_async;
478 
479 	/* Any delegated inos? */
480 	if (xa_empty(&ci->i_auth_cap->session->s_delegated_inos))
481 		goto no_async;
482 
483 	if (!ceph_file_layout_is_valid(&ci->i_cached_layout))
484 		goto no_async;
485 
486 	if ((__ceph_caps_issued(ci, NULL) & want) != want)
487 		goto no_async;
488 
489 	if (d_in_lookup(dentry)) {
490 		if (!__ceph_dir_is_complete(ci))
491 			goto no_async;
492 		spin_lock(&dentry->d_lock);
493 		di->lease_shared_gen = atomic_read(&ci->i_shared_gen);
494 		spin_unlock(&dentry->d_lock);
495 	} else if (atomic_read(&ci->i_shared_gen) !=
496 		   READ_ONCE(di->lease_shared_gen)) {
497 		goto no_async;
498 	}
499 
500 	ino = ceph_get_deleg_ino(ci->i_auth_cap->session);
501 	if (!ino)
502 		goto no_async;
503 
504 	*pino = ino;
505 	ceph_take_cap_refs(ci, want, false);
506 	memcpy(lo, &ci->i_cached_layout, sizeof(*lo));
507 	rcu_assign_pointer(lo->pool_ns,
508 			   ceph_try_get_string(ci->i_cached_layout.pool_ns));
509 	got = want;
510 no_async:
511 	spin_unlock(&ci->i_ceph_lock);
512 	return got;
513 }
514 
restore_deleg_ino(struct inode * dir,u64 ino)515 static void restore_deleg_ino(struct inode *dir, u64 ino)
516 {
517 	struct ceph_inode_info *ci = ceph_inode(dir);
518 	struct ceph_mds_session *s = NULL;
519 
520 	spin_lock(&ci->i_ceph_lock);
521 	if (ci->i_auth_cap)
522 		s = ceph_get_mds_session(ci->i_auth_cap->session);
523 	spin_unlock(&ci->i_ceph_lock);
524 	if (s) {
525 		int err = ceph_restore_deleg_ino(s, ino);
526 		if (err)
527 			pr_warn("ceph: unable to restore delegated ino 0x%llx to session: %d\n",
528 				ino, err);
529 		ceph_put_mds_session(s);
530 	}
531 }
532 
wake_async_create_waiters(struct inode * inode,struct ceph_mds_session * session)533 static void wake_async_create_waiters(struct inode *inode,
534 				      struct ceph_mds_session *session)
535 {
536 	struct ceph_inode_info *ci = ceph_inode(inode);
537 
538 	spin_lock(&ci->i_ceph_lock);
539 	if (ci->i_ceph_flags & CEPH_I_ASYNC_CREATE) {
540 		ci->i_ceph_flags &= ~CEPH_I_ASYNC_CREATE;
541 		wake_up_bit(&ci->i_ceph_flags, CEPH_ASYNC_CREATE_BIT);
542 	}
543 	ceph_kick_flushing_inode_caps(session, ci);
544 	spin_unlock(&ci->i_ceph_lock);
545 }
546 
ceph_async_create_cb(struct ceph_mds_client * mdsc,struct ceph_mds_request * req)547 static void ceph_async_create_cb(struct ceph_mds_client *mdsc,
548                                  struct ceph_mds_request *req)
549 {
550 	struct dentry *dentry = req->r_dentry;
551 	struct inode *dinode = d_inode(dentry);
552 	struct inode *tinode = req->r_target_inode;
553 	int result = req->r_err ? req->r_err :
554 			le32_to_cpu(req->r_reply_info.head->result);
555 
556 	WARN_ON_ONCE(dinode && tinode && dinode != tinode);
557 
558 	/* MDS changed -- caller must resubmit */
559 	if (result == -EJUKEBOX)
560 		goto out;
561 
562 	mapping_set_error(req->r_parent->i_mapping, result);
563 
564 	if (result) {
565 		int pathlen = 0;
566 		u64 base = 0;
567 		char *path = ceph_mdsc_build_path(req->r_dentry, &pathlen,
568 						  &base, 0);
569 
570 		pr_warn("async create failure path=(%llx)%s result=%d!\n",
571 			base, IS_ERR(path) ? "<<bad>>" : path, result);
572 		ceph_mdsc_free_path(path, pathlen);
573 
574 		ceph_dir_clear_complete(req->r_parent);
575 		if (!d_unhashed(dentry))
576 			d_drop(dentry);
577 
578 		if (dinode) {
579 			mapping_set_error(dinode->i_mapping, result);
580 			ceph_inode_shutdown(dinode);
581 			wake_async_create_waiters(dinode, req->r_session);
582 		}
583 	}
584 
585 	if (tinode) {
586 		u64 ino = ceph_vino(tinode).ino;
587 
588 		if (req->r_deleg_ino != ino)
589 			pr_warn("%s: inode number mismatch! err=%d deleg_ino=0x%llx target=0x%llx\n",
590 				__func__, req->r_err, req->r_deleg_ino, ino);
591 
592 		mapping_set_error(tinode->i_mapping, result);
593 		wake_async_create_waiters(tinode, req->r_session);
594 	} else if (!result) {
595 		pr_warn("%s: no req->r_target_inode for 0x%llx\n", __func__,
596 			req->r_deleg_ino);
597 	}
598 out:
599 	ceph_mdsc_release_dir_caps(req);
600 }
601 
ceph_finish_async_create(struct inode * dir,struct dentry * dentry,struct file * file,umode_t mode,struct ceph_mds_request * req,struct ceph_acl_sec_ctx * as_ctx,struct ceph_file_layout * lo)602 static int ceph_finish_async_create(struct inode *dir, struct dentry *dentry,
603 				    struct file *file, umode_t mode,
604 				    struct ceph_mds_request *req,
605 				    struct ceph_acl_sec_ctx *as_ctx,
606 				    struct ceph_file_layout *lo)
607 {
608 	int ret;
609 	char xattr_buf[4];
610 	struct ceph_mds_reply_inode in = { };
611 	struct ceph_mds_reply_info_in iinfo = { .in = &in };
612 	struct ceph_inode_info *ci = ceph_inode(dir);
613 	struct ceph_dentry_info *di = ceph_dentry(dentry);
614 	struct inode *inode;
615 	struct timespec64 now;
616 	struct ceph_string *pool_ns;
617 	struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb);
618 	struct ceph_vino vino = { .ino = req->r_deleg_ino,
619 				  .snap = CEPH_NOSNAP };
620 
621 	ktime_get_real_ts64(&now);
622 
623 	inode = ceph_get_inode(dentry->d_sb, vino);
624 	if (IS_ERR(inode))
625 		return PTR_ERR(inode);
626 
627 	iinfo.inline_version = CEPH_INLINE_NONE;
628 	iinfo.change_attr = 1;
629 	ceph_encode_timespec64(&iinfo.btime, &now);
630 
631 	if (req->r_pagelist) {
632 		iinfo.xattr_len = req->r_pagelist->length;
633 		iinfo.xattr_data = req->r_pagelist->mapped_tail;
634 	} else {
635 		/* fake it */
636 		iinfo.xattr_len = ARRAY_SIZE(xattr_buf);
637 		iinfo.xattr_data = xattr_buf;
638 		memset(iinfo.xattr_data, 0, iinfo.xattr_len);
639 	}
640 
641 	in.ino = cpu_to_le64(vino.ino);
642 	in.snapid = cpu_to_le64(CEPH_NOSNAP);
643 	in.version = cpu_to_le64(1);	// ???
644 	in.cap.caps = in.cap.wanted = cpu_to_le32(CEPH_CAP_ALL_FILE);
645 	in.cap.cap_id = cpu_to_le64(1);
646 	in.cap.realm = cpu_to_le64(ci->i_snap_realm->ino);
647 	in.cap.flags = CEPH_CAP_FLAG_AUTH;
648 	in.ctime = in.mtime = in.atime = iinfo.btime;
649 	in.truncate_seq = cpu_to_le32(1);
650 	in.truncate_size = cpu_to_le64(-1ULL);
651 	in.xattr_version = cpu_to_le64(1);
652 	in.uid = cpu_to_le32(from_kuid(&init_user_ns, current_fsuid()));
653 	if (dir->i_mode & S_ISGID) {
654 		in.gid = cpu_to_le32(from_kgid(&init_user_ns, dir->i_gid));
655 
656 		/* Directories always inherit the setgid bit. */
657 		if (S_ISDIR(mode))
658 			mode |= S_ISGID;
659 	} else {
660 		in.gid = cpu_to_le32(from_kgid(&init_user_ns, current_fsgid()));
661 	}
662 	in.mode = cpu_to_le32((u32)mode);
663 
664 	in.nlink = cpu_to_le32(1);
665 	in.max_size = cpu_to_le64(lo->stripe_unit);
666 
667 	ceph_file_layout_to_legacy(lo, &in.layout);
668 	/* lo is private, so pool_ns can't change */
669 	pool_ns = rcu_dereference_raw(lo->pool_ns);
670 	if (pool_ns) {
671 		iinfo.pool_ns_len = pool_ns->len;
672 		iinfo.pool_ns_data = pool_ns->str;
673 	}
674 
675 	down_read(&mdsc->snap_rwsem);
676 	ret = ceph_fill_inode(inode, NULL, &iinfo, NULL, req->r_session,
677 			      req->r_fmode, NULL);
678 	up_read(&mdsc->snap_rwsem);
679 	if (ret) {
680 		dout("%s failed to fill inode: %d\n", __func__, ret);
681 		ceph_dir_clear_complete(dir);
682 		if (!d_unhashed(dentry))
683 			d_drop(dentry);
684 		if (inode->i_state & I_NEW)
685 			discard_new_inode(inode);
686 	} else {
687 		struct dentry *dn;
688 
689 		dout("%s d_adding new inode 0x%llx to 0x%llx/%s\n", __func__,
690 			vino.ino, ceph_ino(dir), dentry->d_name.name);
691 		ceph_dir_clear_ordered(dir);
692 		ceph_init_inode_acls(inode, as_ctx);
693 		if (inode->i_state & I_NEW) {
694 			/*
695 			 * If it's not I_NEW, then someone created this before
696 			 * we got here. Assume the server is aware of it at
697 			 * that point and don't worry about setting
698 			 * CEPH_I_ASYNC_CREATE.
699 			 */
700 			ceph_inode(inode)->i_ceph_flags = CEPH_I_ASYNC_CREATE;
701 			unlock_new_inode(inode);
702 		}
703 		if (d_in_lookup(dentry) || d_really_is_negative(dentry)) {
704 			if (!d_unhashed(dentry))
705 				d_drop(dentry);
706 			dn = d_splice_alias(inode, dentry);
707 			WARN_ON_ONCE(dn && dn != dentry);
708 		}
709 		file->f_mode |= FMODE_CREATED;
710 		ret = finish_open(file, dentry, ceph_open);
711 	}
712 
713 	spin_lock(&dentry->d_lock);
714 	di->flags &= ~CEPH_DENTRY_ASYNC_CREATE;
715 	wake_up_bit(&di->flags, CEPH_DENTRY_ASYNC_CREATE_BIT);
716 	spin_unlock(&dentry->d_lock);
717 
718 	return ret;
719 }
720 
721 /*
722  * Do a lookup + open with a single request.  If we get a non-existent
723  * file or symlink, return 1 so the VFS can retry.
724  */
ceph_atomic_open(struct inode * dir,struct dentry * dentry,struct file * file,unsigned flags,umode_t mode)725 int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
726 		     struct file *file, unsigned flags, umode_t mode)
727 {
728 	struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
729 	struct ceph_mds_client *mdsc = fsc->mdsc;
730 	struct ceph_mds_request *req;
731 	struct dentry *dn;
732 	struct ceph_acl_sec_ctx as_ctx = {};
733 	bool try_async = ceph_test_mount_opt(fsc, ASYNC_DIROPS);
734 	int mask;
735 	int err;
736 
737 	dout("atomic_open %p dentry %p '%pd' %s flags %d mode 0%o\n",
738 	     dir, dentry, dentry,
739 	     d_unhashed(dentry) ? "unhashed" : "hashed", flags, mode);
740 
741 	if (dentry->d_name.len > NAME_MAX)
742 		return -ENAMETOOLONG;
743 
744 	err = ceph_wait_on_conflict_unlink(dentry);
745 	if (err)
746 		return err;
747 	/*
748 	 * Do not truncate the file, since atomic_open is called before the
749 	 * permission check. The caller will do the truncation afterward.
750 	 */
751 	flags &= ~O_TRUNC;
752 
753 	if (flags & O_CREAT) {
754 		if (ceph_quota_is_max_files_exceeded(dir))
755 			return -EDQUOT;
756 		err = ceph_pre_init_acls(dir, &mode, &as_ctx);
757 		if (err < 0)
758 			return err;
759 		err = ceph_security_init_secctx(dentry, mode, &as_ctx);
760 		if (err < 0)
761 			goto out_ctx;
762 		/* Async create can't handle more than a page of xattrs */
763 		if (as_ctx.pagelist &&
764 		    !list_is_singular(&as_ctx.pagelist->head))
765 			try_async = false;
766 	} else if (!d_in_lookup(dentry)) {
767 		/* If it's not being looked up, it's negative */
768 		return -ENOENT;
769 	}
770 retry:
771 	/* do the open */
772 	req = prepare_open_request(dir->i_sb, flags, mode);
773 	if (IS_ERR(req)) {
774 		err = PTR_ERR(req);
775 		goto out_ctx;
776 	}
777 	req->r_dentry = dget(dentry);
778 	req->r_num_caps = 2;
779 	mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED;
780 	if (ceph_security_xattr_wanted(dir))
781 		mask |= CEPH_CAP_XATTR_SHARED;
782 	req->r_args.open.mask = cpu_to_le32(mask);
783 	req->r_parent = dir;
784 	ihold(dir);
785 
786 	if (flags & O_CREAT) {
787 		struct ceph_file_layout lo;
788 
789 		req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL;
790 		req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
791 		if (as_ctx.pagelist) {
792 			req->r_pagelist = as_ctx.pagelist;
793 			as_ctx.pagelist = NULL;
794 		}
795 		if (try_async &&
796 		    (req->r_dir_caps =
797 		      try_prep_async_create(dir, dentry, &lo,
798 					    &req->r_deleg_ino))) {
799 			struct ceph_dentry_info *di = ceph_dentry(dentry);
800 
801 			set_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags);
802 			req->r_args.open.flags |= cpu_to_le32(CEPH_O_EXCL);
803 			req->r_callback = ceph_async_create_cb;
804 
805 			spin_lock(&dentry->d_lock);
806 			di->flags |= CEPH_DENTRY_ASYNC_CREATE;
807 			spin_unlock(&dentry->d_lock);
808 
809 			err = ceph_mdsc_submit_request(mdsc, dir, req);
810 			if (!err) {
811 				err = ceph_finish_async_create(dir, dentry,
812 							file, mode, req,
813 							&as_ctx, &lo);
814 			} else if (err == -EJUKEBOX) {
815 				restore_deleg_ino(dir, req->r_deleg_ino);
816 				ceph_mdsc_put_request(req);
817 				try_async = false;
818 				ceph_put_string(rcu_dereference_raw(lo.pool_ns));
819 				goto retry;
820 			}
821 			ceph_put_string(rcu_dereference_raw(lo.pool_ns));
822 			goto out_req;
823 		}
824 	}
825 
826 	set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
827 	err = ceph_mdsc_do_request(mdsc, (flags & O_CREAT) ? dir : NULL, req);
828 	if (err == -ENOENT) {
829 		dentry = ceph_handle_snapdir(req, dentry);
830 		if (IS_ERR(dentry)) {
831 			err = PTR_ERR(dentry);
832 			goto out_req;
833 		}
834 		err = 0;
835 	}
836 
837 	if (!err && (flags & O_CREAT) && !req->r_reply_info.head->is_dentry)
838 		err = ceph_handle_notrace_create(dir, dentry);
839 
840 	if (d_in_lookup(dentry)) {
841 		dn = ceph_finish_lookup(req, dentry, err);
842 		if (IS_ERR(dn))
843 			err = PTR_ERR(dn);
844 	} else {
845 		/* we were given a hashed negative dentry */
846 		dn = NULL;
847 	}
848 	if (err)
849 		goto out_req;
850 	if (dn || d_really_is_negative(dentry) || d_is_symlink(dentry)) {
851 		/* make vfs retry on splice, ENOENT, or symlink */
852 		dout("atomic_open finish_no_open on dn %p\n", dn);
853 		err = finish_no_open(file, dn);
854 	} else {
855 		dout("atomic_open finish_open on dn %p\n", dn);
856 		if (req->r_op == CEPH_MDS_OP_CREATE && req->r_reply_info.has_create_ino) {
857 			struct inode *newino = d_inode(dentry);
858 
859 			cache_file_layout(dir, newino);
860 			ceph_init_inode_acls(newino, &as_ctx);
861 			file->f_mode |= FMODE_CREATED;
862 		}
863 		err = finish_open(file, dentry, ceph_open);
864 	}
865 out_req:
866 	ceph_mdsc_put_request(req);
867 out_ctx:
868 	ceph_release_acl_sec_ctx(&as_ctx);
869 	dout("atomic_open result=%d\n", err);
870 	return err;
871 }
872 
ceph_release(struct inode * inode,struct file * file)873 int ceph_release(struct inode *inode, struct file *file)
874 {
875 	struct ceph_inode_info *ci = ceph_inode(inode);
876 
877 	if (S_ISDIR(inode->i_mode)) {
878 		struct ceph_dir_file_info *dfi = file->private_data;
879 		dout("release inode %p dir file %p\n", inode, file);
880 		WARN_ON(!list_empty(&dfi->file_info.rw_contexts));
881 
882 		ceph_put_fmode(ci, dfi->file_info.fmode, 1);
883 
884 		if (dfi->last_readdir)
885 			ceph_mdsc_put_request(dfi->last_readdir);
886 		kfree(dfi->last_name);
887 		kfree(dfi->dir_info);
888 		kmem_cache_free(ceph_dir_file_cachep, dfi);
889 	} else {
890 		struct ceph_file_info *fi = file->private_data;
891 		dout("release inode %p regular file %p\n", inode, file);
892 		WARN_ON(!list_empty(&fi->rw_contexts));
893 
894 		ceph_fscache_unuse_cookie(inode, file->f_mode & FMODE_WRITE);
895 		ceph_put_fmode(ci, fi->fmode, 1);
896 
897 		kmem_cache_free(ceph_file_cachep, fi);
898 	}
899 
900 	/* wake up anyone waiting for caps on this inode */
901 	wake_up_all(&ci->i_cap_wq);
902 	return 0;
903 }
904 
905 enum {
906 	HAVE_RETRIED = 1,
907 	CHECK_EOF =    2,
908 	READ_INLINE =  3,
909 };
910 
911 /*
912  * Completely synchronous read and write methods.  Direct from __user
913  * buffer to osd, or directly to user pages (if O_DIRECT).
914  *
915  * If the read spans object boundary, just do multiple reads.  (That's not
916  * atomic, but good enough for now.)
917  *
918  * If we get a short result from the OSD, check against i_size; we need to
919  * only return a short read to the caller if we hit EOF.
920  */
ceph_sync_read(struct kiocb * iocb,struct iov_iter * to,int * retry_op)921 static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *to,
922 			      int *retry_op)
923 {
924 	struct file *file = iocb->ki_filp;
925 	struct inode *inode = file_inode(file);
926 	struct ceph_inode_info *ci = ceph_inode(inode);
927 	struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
928 	struct ceph_osd_client *osdc = &fsc->client->osdc;
929 	ssize_t ret;
930 	u64 off = iocb->ki_pos;
931 	u64 len = iov_iter_count(to);
932 	u64 i_size = i_size_read(inode);
933 
934 	dout("sync_read on file %p %llu~%u %s\n", file, off, (unsigned)len,
935 	     (file->f_flags & O_DIRECT) ? "O_DIRECT" : "");
936 
937 	if (!len)
938 		return 0;
939 	/*
940 	 * flush any page cache pages in this range.  this
941 	 * will make concurrent normal and sync io slow,
942 	 * but it will at least behave sensibly when they are
943 	 * in sequence.
944 	 */
945 	ret = filemap_write_and_wait_range(inode->i_mapping,
946 					   off, off + len - 1);
947 	if (ret < 0)
948 		return ret;
949 
950 	ret = 0;
951 	while ((len = iov_iter_count(to)) > 0) {
952 		struct ceph_osd_request *req;
953 		struct page **pages;
954 		int num_pages;
955 		size_t page_off;
956 		bool more;
957 		int idx;
958 		size_t left;
959 
960 		req = ceph_osdc_new_request(osdc, &ci->i_layout,
961 					ci->i_vino, off, &len, 0, 1,
962 					CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ,
963 					NULL, ci->i_truncate_seq,
964 					ci->i_truncate_size, false);
965 		if (IS_ERR(req)) {
966 			ret = PTR_ERR(req);
967 			break;
968 		}
969 
970 		more = len < iov_iter_count(to);
971 
972 		num_pages = calc_pages_for(off, len);
973 		page_off = off & ~PAGE_MASK;
974 		pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL);
975 		if (IS_ERR(pages)) {
976 			ceph_osdc_put_request(req);
977 			ret = PTR_ERR(pages);
978 			break;
979 		}
980 
981 		osd_req_op_extent_osd_data_pages(req, 0, pages, len, page_off,
982 						 false, false);
983 		ceph_osdc_start_request(osdc, req);
984 		ret = ceph_osdc_wait_request(osdc, req);
985 
986 		ceph_update_read_metrics(&fsc->mdsc->metric,
987 					 req->r_start_latency,
988 					 req->r_end_latency,
989 					 len, ret);
990 
991 		ceph_osdc_put_request(req);
992 
993 		i_size = i_size_read(inode);
994 		dout("sync_read %llu~%llu got %zd i_size %llu%s\n",
995 		     off, len, ret, i_size, (more ? " MORE" : ""));
996 
997 		if (ret == -ENOENT)
998 			ret = 0;
999 		if (ret >= 0 && ret < len && (off + ret < i_size)) {
1000 			int zlen = min(len - ret, i_size - off - ret);
1001 			int zoff = page_off + ret;
1002 			dout("sync_read zero gap %llu~%llu\n",
1003                              off + ret, off + ret + zlen);
1004 			ceph_zero_page_vector_range(zoff, zlen, pages);
1005 			ret += zlen;
1006 		}
1007 
1008 		idx = 0;
1009 		left = ret > 0 ? ret : 0;
1010 		while (left > 0) {
1011 			size_t len, copied;
1012 			page_off = off & ~PAGE_MASK;
1013 			len = min_t(size_t, left, PAGE_SIZE - page_off);
1014 			SetPageUptodate(pages[idx]);
1015 			copied = copy_page_to_iter(pages[idx++],
1016 						   page_off, len, to);
1017 			off += copied;
1018 			left -= copied;
1019 			if (copied < len) {
1020 				ret = -EFAULT;
1021 				break;
1022 			}
1023 		}
1024 		ceph_release_page_vector(pages, num_pages);
1025 
1026 		if (ret < 0) {
1027 			if (ret == -EBLOCKLISTED)
1028 				fsc->blocklisted = true;
1029 			break;
1030 		}
1031 
1032 		if (off >= i_size || !more)
1033 			break;
1034 	}
1035 
1036 	if (off > iocb->ki_pos) {
1037 		if (off >= i_size) {
1038 			*retry_op = CHECK_EOF;
1039 			ret = i_size - iocb->ki_pos;
1040 			iocb->ki_pos = i_size;
1041 		} else {
1042 			ret = off - iocb->ki_pos;
1043 			iocb->ki_pos = off;
1044 		}
1045 	}
1046 
1047 	dout("sync_read result %zd retry_op %d\n", ret, *retry_op);
1048 	return ret;
1049 }
1050 
1051 struct ceph_aio_request {
1052 	struct kiocb *iocb;
1053 	size_t total_len;
1054 	bool write;
1055 	bool should_dirty;
1056 	int error;
1057 	struct list_head osd_reqs;
1058 	unsigned num_reqs;
1059 	atomic_t pending_reqs;
1060 	struct timespec64 mtime;
1061 	struct ceph_cap_flush *prealloc_cf;
1062 };
1063 
1064 struct ceph_aio_work {
1065 	struct work_struct work;
1066 	struct ceph_osd_request *req;
1067 };
1068 
1069 static void ceph_aio_retry_work(struct work_struct *work);
1070 
ceph_aio_complete(struct inode * inode,struct ceph_aio_request * aio_req)1071 static void ceph_aio_complete(struct inode *inode,
1072 			      struct ceph_aio_request *aio_req)
1073 {
1074 	struct ceph_inode_info *ci = ceph_inode(inode);
1075 	int ret;
1076 
1077 	if (!atomic_dec_and_test(&aio_req->pending_reqs))
1078 		return;
1079 
1080 	if (aio_req->iocb->ki_flags & IOCB_DIRECT)
1081 		inode_dio_end(inode);
1082 
1083 	ret = aio_req->error;
1084 	if (!ret)
1085 		ret = aio_req->total_len;
1086 
1087 	dout("ceph_aio_complete %p rc %d\n", inode, ret);
1088 
1089 	if (ret >= 0 && aio_req->write) {
1090 		int dirty;
1091 
1092 		loff_t endoff = aio_req->iocb->ki_pos + aio_req->total_len;
1093 		if (endoff > i_size_read(inode)) {
1094 			if (ceph_inode_set_size(inode, endoff))
1095 				ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
1096 		}
1097 
1098 		spin_lock(&ci->i_ceph_lock);
1099 		dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
1100 					       &aio_req->prealloc_cf);
1101 		spin_unlock(&ci->i_ceph_lock);
1102 		if (dirty)
1103 			__mark_inode_dirty(inode, dirty);
1104 
1105 	}
1106 
1107 	ceph_put_cap_refs(ci, (aio_req->write ? CEPH_CAP_FILE_WR :
1108 						CEPH_CAP_FILE_RD));
1109 
1110 	aio_req->iocb->ki_complete(aio_req->iocb, ret);
1111 
1112 	ceph_free_cap_flush(aio_req->prealloc_cf);
1113 	kfree(aio_req);
1114 }
1115 
ceph_aio_complete_req(struct ceph_osd_request * req)1116 static void ceph_aio_complete_req(struct ceph_osd_request *req)
1117 {
1118 	int rc = req->r_result;
1119 	struct inode *inode = req->r_inode;
1120 	struct ceph_aio_request *aio_req = req->r_priv;
1121 	struct ceph_osd_data *osd_data = osd_req_op_extent_osd_data(req, 0);
1122 	struct ceph_client_metric *metric = &ceph_sb_to_mdsc(inode->i_sb)->metric;
1123 	unsigned int len = osd_data->bvec_pos.iter.bi_size;
1124 
1125 	BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_BVECS);
1126 	BUG_ON(!osd_data->num_bvecs);
1127 
1128 	dout("ceph_aio_complete_req %p rc %d bytes %u\n", inode, rc, len);
1129 
1130 	if (rc == -EOLDSNAPC) {
1131 		struct ceph_aio_work *aio_work;
1132 		BUG_ON(!aio_req->write);
1133 
1134 		aio_work = kmalloc(sizeof(*aio_work), GFP_NOFS);
1135 		if (aio_work) {
1136 			INIT_WORK(&aio_work->work, ceph_aio_retry_work);
1137 			aio_work->req = req;
1138 			queue_work(ceph_inode_to_client(inode)->inode_wq,
1139 				   &aio_work->work);
1140 			return;
1141 		}
1142 		rc = -ENOMEM;
1143 	} else if (!aio_req->write) {
1144 		if (rc == -ENOENT)
1145 			rc = 0;
1146 		if (rc >= 0 && len > rc) {
1147 			struct iov_iter i;
1148 			int zlen = len - rc;
1149 
1150 			/*
1151 			 * If read is satisfied by single OSD request,
1152 			 * it can pass EOF. Otherwise read is within
1153 			 * i_size.
1154 			 */
1155 			if (aio_req->num_reqs == 1) {
1156 				loff_t i_size = i_size_read(inode);
1157 				loff_t endoff = aio_req->iocb->ki_pos + rc;
1158 				if (endoff < i_size)
1159 					zlen = min_t(size_t, zlen,
1160 						     i_size - endoff);
1161 				aio_req->total_len = rc + zlen;
1162 			}
1163 
1164 			iov_iter_bvec(&i, READ, osd_data->bvec_pos.bvecs,
1165 				      osd_data->num_bvecs, len);
1166 			iov_iter_advance(&i, rc);
1167 			iov_iter_zero(zlen, &i);
1168 		}
1169 	}
1170 
1171 	/* r_start_latency == 0 means the request was not submitted */
1172 	if (req->r_start_latency) {
1173 		if (aio_req->write)
1174 			ceph_update_write_metrics(metric, req->r_start_latency,
1175 						  req->r_end_latency, len, rc);
1176 		else
1177 			ceph_update_read_metrics(metric, req->r_start_latency,
1178 						 req->r_end_latency, len, rc);
1179 	}
1180 
1181 	put_bvecs(osd_data->bvec_pos.bvecs, osd_data->num_bvecs,
1182 		  aio_req->should_dirty);
1183 	ceph_osdc_put_request(req);
1184 
1185 	if (rc < 0)
1186 		cmpxchg(&aio_req->error, 0, rc);
1187 
1188 	ceph_aio_complete(inode, aio_req);
1189 	return;
1190 }
1191 
ceph_aio_retry_work(struct work_struct * work)1192 static void ceph_aio_retry_work(struct work_struct *work)
1193 {
1194 	struct ceph_aio_work *aio_work =
1195 		container_of(work, struct ceph_aio_work, work);
1196 	struct ceph_osd_request *orig_req = aio_work->req;
1197 	struct ceph_aio_request *aio_req = orig_req->r_priv;
1198 	struct inode *inode = orig_req->r_inode;
1199 	struct ceph_inode_info *ci = ceph_inode(inode);
1200 	struct ceph_snap_context *snapc;
1201 	struct ceph_osd_request *req;
1202 	int ret;
1203 
1204 	spin_lock(&ci->i_ceph_lock);
1205 	if (__ceph_have_pending_cap_snap(ci)) {
1206 		struct ceph_cap_snap *capsnap =
1207 			list_last_entry(&ci->i_cap_snaps,
1208 					struct ceph_cap_snap,
1209 					ci_item);
1210 		snapc = ceph_get_snap_context(capsnap->context);
1211 	} else {
1212 		BUG_ON(!ci->i_head_snapc);
1213 		snapc = ceph_get_snap_context(ci->i_head_snapc);
1214 	}
1215 	spin_unlock(&ci->i_ceph_lock);
1216 
1217 	req = ceph_osdc_alloc_request(orig_req->r_osdc, snapc, 1,
1218 			false, GFP_NOFS);
1219 	if (!req) {
1220 		ret = -ENOMEM;
1221 		req = orig_req;
1222 		goto out;
1223 	}
1224 
1225 	req->r_flags = /* CEPH_OSD_FLAG_ORDERSNAP | */ CEPH_OSD_FLAG_WRITE;
1226 	ceph_oloc_copy(&req->r_base_oloc, &orig_req->r_base_oloc);
1227 	ceph_oid_copy(&req->r_base_oid, &orig_req->r_base_oid);
1228 
1229 	req->r_ops[0] = orig_req->r_ops[0];
1230 
1231 	req->r_mtime = aio_req->mtime;
1232 	req->r_data_offset = req->r_ops[0].extent.offset;
1233 
1234 	ret = ceph_osdc_alloc_messages(req, GFP_NOFS);
1235 	if (ret) {
1236 		ceph_osdc_put_request(req);
1237 		req = orig_req;
1238 		goto out;
1239 	}
1240 
1241 	ceph_osdc_put_request(orig_req);
1242 
1243 	req->r_callback = ceph_aio_complete_req;
1244 	req->r_inode = inode;
1245 	req->r_priv = aio_req;
1246 
1247 	ceph_osdc_start_request(req->r_osdc, req);
1248 out:
1249 	if (ret < 0) {
1250 		req->r_result = ret;
1251 		ceph_aio_complete_req(req);
1252 	}
1253 
1254 	ceph_put_snap_context(snapc);
1255 	kfree(aio_work);
1256 }
1257 
1258 static ssize_t
ceph_direct_read_write(struct kiocb * iocb,struct iov_iter * iter,struct ceph_snap_context * snapc,struct ceph_cap_flush ** pcf)1259 ceph_direct_read_write(struct kiocb *iocb, struct iov_iter *iter,
1260 		       struct ceph_snap_context *snapc,
1261 		       struct ceph_cap_flush **pcf)
1262 {
1263 	struct file *file = iocb->ki_filp;
1264 	struct inode *inode = file_inode(file);
1265 	struct ceph_inode_info *ci = ceph_inode(inode);
1266 	struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1267 	struct ceph_client_metric *metric = &fsc->mdsc->metric;
1268 	struct ceph_vino vino;
1269 	struct ceph_osd_request *req;
1270 	struct bio_vec *bvecs;
1271 	struct ceph_aio_request *aio_req = NULL;
1272 	int num_pages = 0;
1273 	int flags;
1274 	int ret = 0;
1275 	struct timespec64 mtime = current_time(inode);
1276 	size_t count = iov_iter_count(iter);
1277 	loff_t pos = iocb->ki_pos;
1278 	bool write = iov_iter_rw(iter) == WRITE;
1279 	bool should_dirty = !write && user_backed_iter(iter);
1280 
1281 	if (write && ceph_snap(file_inode(file)) != CEPH_NOSNAP)
1282 		return -EROFS;
1283 
1284 	dout("sync_direct_%s on file %p %lld~%u snapc %p seq %lld\n",
1285 	     (write ? "write" : "read"), file, pos, (unsigned)count,
1286 	     snapc, snapc ? snapc->seq : 0);
1287 
1288 	if (write) {
1289 		int ret2;
1290 
1291 		ceph_fscache_invalidate(inode, true);
1292 
1293 		ret2 = invalidate_inode_pages2_range(inode->i_mapping,
1294 					pos >> PAGE_SHIFT,
1295 					(pos + count - 1) >> PAGE_SHIFT);
1296 		if (ret2 < 0)
1297 			dout("invalidate_inode_pages2_range returned %d\n", ret2);
1298 
1299 		flags = /* CEPH_OSD_FLAG_ORDERSNAP | */ CEPH_OSD_FLAG_WRITE;
1300 	} else {
1301 		flags = CEPH_OSD_FLAG_READ;
1302 	}
1303 
1304 	while (iov_iter_count(iter) > 0) {
1305 		u64 size = iov_iter_count(iter);
1306 		ssize_t len;
1307 
1308 		if (write)
1309 			size = min_t(u64, size, fsc->mount_options->wsize);
1310 		else
1311 			size = min_t(u64, size, fsc->mount_options->rsize);
1312 
1313 		vino = ceph_vino(inode);
1314 		req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1315 					    vino, pos, &size, 0,
1316 					    1,
1317 					    write ? CEPH_OSD_OP_WRITE :
1318 						    CEPH_OSD_OP_READ,
1319 					    flags, snapc,
1320 					    ci->i_truncate_seq,
1321 					    ci->i_truncate_size,
1322 					    false);
1323 		if (IS_ERR(req)) {
1324 			ret = PTR_ERR(req);
1325 			break;
1326 		}
1327 
1328 		len = iter_get_bvecs_alloc(iter, size, &bvecs, &num_pages);
1329 		if (len < 0) {
1330 			ceph_osdc_put_request(req);
1331 			ret = len;
1332 			break;
1333 		}
1334 		if (len != size)
1335 			osd_req_op_extent_update(req, 0, len);
1336 
1337 		/*
1338 		 * To simplify error handling, allow AIO when IO within i_size
1339 		 * or IO can be satisfied by single OSD request.
1340 		 */
1341 		if (pos == iocb->ki_pos && !is_sync_kiocb(iocb) &&
1342 		    (len == count || pos + count <= i_size_read(inode))) {
1343 			aio_req = kzalloc(sizeof(*aio_req), GFP_KERNEL);
1344 			if (aio_req) {
1345 				aio_req->iocb = iocb;
1346 				aio_req->write = write;
1347 				aio_req->should_dirty = should_dirty;
1348 				INIT_LIST_HEAD(&aio_req->osd_reqs);
1349 				if (write) {
1350 					aio_req->mtime = mtime;
1351 					swap(aio_req->prealloc_cf, *pcf);
1352 				}
1353 			}
1354 			/* ignore error */
1355 		}
1356 
1357 		if (write) {
1358 			/*
1359 			 * throw out any page cache pages in this range. this
1360 			 * may block.
1361 			 */
1362 			truncate_inode_pages_range(inode->i_mapping, pos,
1363 						   PAGE_ALIGN(pos + len) - 1);
1364 
1365 			req->r_mtime = mtime;
1366 		}
1367 
1368 		osd_req_op_extent_osd_data_bvecs(req, 0, bvecs, num_pages, len);
1369 
1370 		if (aio_req) {
1371 			aio_req->total_len += len;
1372 			aio_req->num_reqs++;
1373 			atomic_inc(&aio_req->pending_reqs);
1374 
1375 			req->r_callback = ceph_aio_complete_req;
1376 			req->r_inode = inode;
1377 			req->r_priv = aio_req;
1378 			list_add_tail(&req->r_private_item, &aio_req->osd_reqs);
1379 
1380 			pos += len;
1381 			continue;
1382 		}
1383 
1384 		ceph_osdc_start_request(req->r_osdc, req);
1385 		ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
1386 
1387 		if (write)
1388 			ceph_update_write_metrics(metric, req->r_start_latency,
1389 						  req->r_end_latency, len, ret);
1390 		else
1391 			ceph_update_read_metrics(metric, req->r_start_latency,
1392 						 req->r_end_latency, len, ret);
1393 
1394 		size = i_size_read(inode);
1395 		if (!write) {
1396 			if (ret == -ENOENT)
1397 				ret = 0;
1398 			if (ret >= 0 && ret < len && pos + ret < size) {
1399 				struct iov_iter i;
1400 				int zlen = min_t(size_t, len - ret,
1401 						 size - pos - ret);
1402 
1403 				iov_iter_bvec(&i, READ, bvecs, num_pages, len);
1404 				iov_iter_advance(&i, ret);
1405 				iov_iter_zero(zlen, &i);
1406 				ret += zlen;
1407 			}
1408 			if (ret >= 0)
1409 				len = ret;
1410 		}
1411 
1412 		put_bvecs(bvecs, num_pages, should_dirty);
1413 		ceph_osdc_put_request(req);
1414 		if (ret < 0)
1415 			break;
1416 
1417 		pos += len;
1418 		if (!write && pos >= size)
1419 			break;
1420 
1421 		if (write && pos > size) {
1422 			if (ceph_inode_set_size(inode, pos))
1423 				ceph_check_caps(ceph_inode(inode),
1424 						CHECK_CAPS_AUTHONLY,
1425 						NULL);
1426 		}
1427 	}
1428 
1429 	if (aio_req) {
1430 		LIST_HEAD(osd_reqs);
1431 
1432 		if (aio_req->num_reqs == 0) {
1433 			kfree(aio_req);
1434 			return ret;
1435 		}
1436 
1437 		ceph_get_cap_refs(ci, write ? CEPH_CAP_FILE_WR :
1438 					      CEPH_CAP_FILE_RD);
1439 
1440 		list_splice(&aio_req->osd_reqs, &osd_reqs);
1441 		inode_dio_begin(inode);
1442 		while (!list_empty(&osd_reqs)) {
1443 			req = list_first_entry(&osd_reqs,
1444 					       struct ceph_osd_request,
1445 					       r_private_item);
1446 			list_del_init(&req->r_private_item);
1447 			if (ret >= 0)
1448 				ceph_osdc_start_request(req->r_osdc, req);
1449 			if (ret < 0) {
1450 				req->r_result = ret;
1451 				ceph_aio_complete_req(req);
1452 			}
1453 		}
1454 		return -EIOCBQUEUED;
1455 	}
1456 
1457 	if (ret != -EOLDSNAPC && pos > iocb->ki_pos) {
1458 		ret = pos - iocb->ki_pos;
1459 		iocb->ki_pos = pos;
1460 	}
1461 	return ret;
1462 }
1463 
1464 /*
1465  * Synchronous write, straight from __user pointer or user pages.
1466  *
1467  * If write spans object boundary, just do multiple writes.  (For a
1468  * correct atomic write, we should e.g. take write locks on all
1469  * objects, rollback on failure, etc.)
1470  */
1471 static ssize_t
ceph_sync_write(struct kiocb * iocb,struct iov_iter * from,loff_t pos,struct ceph_snap_context * snapc)1472 ceph_sync_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos,
1473 		struct ceph_snap_context *snapc)
1474 {
1475 	struct file *file = iocb->ki_filp;
1476 	struct inode *inode = file_inode(file);
1477 	struct ceph_inode_info *ci = ceph_inode(inode);
1478 	struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1479 	struct ceph_vino vino;
1480 	struct ceph_osd_request *req;
1481 	struct page **pages;
1482 	u64 len;
1483 	int num_pages;
1484 	int written = 0;
1485 	int flags;
1486 	int ret;
1487 	bool check_caps = false;
1488 	struct timespec64 mtime = current_time(inode);
1489 	size_t count = iov_iter_count(from);
1490 
1491 	if (ceph_snap(file_inode(file)) != CEPH_NOSNAP)
1492 		return -EROFS;
1493 
1494 	dout("sync_write on file %p %lld~%u snapc %p seq %lld\n",
1495 	     file, pos, (unsigned)count, snapc, snapc->seq);
1496 
1497 	ret = filemap_write_and_wait_range(inode->i_mapping,
1498 					   pos, pos + count - 1);
1499 	if (ret < 0)
1500 		return ret;
1501 
1502 	ceph_fscache_invalidate(inode, false);
1503 	ret = invalidate_inode_pages2_range(inode->i_mapping,
1504 					    pos >> PAGE_SHIFT,
1505 					    (pos + count - 1) >> PAGE_SHIFT);
1506 	if (ret < 0)
1507 		dout("invalidate_inode_pages2_range returned %d\n", ret);
1508 
1509 	flags = /* CEPH_OSD_FLAG_ORDERSNAP | */ CEPH_OSD_FLAG_WRITE;
1510 
1511 	while ((len = iov_iter_count(from)) > 0) {
1512 		size_t left;
1513 		int n;
1514 
1515 		vino = ceph_vino(inode);
1516 		req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1517 					    vino, pos, &len, 0, 1,
1518 					    CEPH_OSD_OP_WRITE, flags, snapc,
1519 					    ci->i_truncate_seq,
1520 					    ci->i_truncate_size,
1521 					    false);
1522 		if (IS_ERR(req)) {
1523 			ret = PTR_ERR(req);
1524 			break;
1525 		}
1526 
1527 		/*
1528 		 * write from beginning of first page,
1529 		 * regardless of io alignment
1530 		 */
1531 		num_pages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
1532 
1533 		pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL);
1534 		if (IS_ERR(pages)) {
1535 			ret = PTR_ERR(pages);
1536 			goto out;
1537 		}
1538 
1539 		left = len;
1540 		for (n = 0; n < num_pages; n++) {
1541 			size_t plen = min_t(size_t, left, PAGE_SIZE);
1542 			ret = copy_page_from_iter(pages[n], 0, plen, from);
1543 			if (ret != plen) {
1544 				ret = -EFAULT;
1545 				break;
1546 			}
1547 			left -= ret;
1548 		}
1549 
1550 		if (ret < 0) {
1551 			ceph_release_page_vector(pages, num_pages);
1552 			goto out;
1553 		}
1554 
1555 		req->r_inode = inode;
1556 
1557 		osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0,
1558 						false, true);
1559 
1560 		req->r_mtime = mtime;
1561 		ceph_osdc_start_request(&fsc->client->osdc, req);
1562 		ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
1563 
1564 		ceph_update_write_metrics(&fsc->mdsc->metric, req->r_start_latency,
1565 					  req->r_end_latency, len, ret);
1566 out:
1567 		ceph_osdc_put_request(req);
1568 		if (ret != 0) {
1569 			ceph_set_error_write(ci);
1570 			break;
1571 		}
1572 
1573 		ceph_clear_error_write(ci);
1574 		pos += len;
1575 		written += len;
1576 		if (pos > i_size_read(inode)) {
1577 			check_caps = ceph_inode_set_size(inode, pos);
1578 			if (check_caps)
1579 				ceph_check_caps(ceph_inode(inode),
1580 						CHECK_CAPS_AUTHONLY,
1581 						NULL);
1582 		}
1583 
1584 	}
1585 
1586 	if (ret != -EOLDSNAPC && written > 0) {
1587 		ret = written;
1588 		iocb->ki_pos = pos;
1589 	}
1590 	return ret;
1591 }
1592 
1593 /*
1594  * Wrap generic_file_aio_read with checks for cap bits on the inode.
1595  * Atomically grab references, so that those bits are not released
1596  * back to the MDS mid-read.
1597  *
1598  * Hmm, the sync read case isn't actually async... should it be?
1599  */
ceph_read_iter(struct kiocb * iocb,struct iov_iter * to)1600 static ssize_t ceph_read_iter(struct kiocb *iocb, struct iov_iter *to)
1601 {
1602 	struct file *filp = iocb->ki_filp;
1603 	struct ceph_file_info *fi = filp->private_data;
1604 	size_t len = iov_iter_count(to);
1605 	struct inode *inode = file_inode(filp);
1606 	struct ceph_inode_info *ci = ceph_inode(inode);
1607 	bool direct_lock = iocb->ki_flags & IOCB_DIRECT;
1608 	ssize_t ret;
1609 	int want = 0, got = 0;
1610 	int retry_op = 0, read = 0;
1611 
1612 again:
1613 	dout("aio_read %p %llx.%llx %llu~%u trying to get caps on %p\n",
1614 	     inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len, inode);
1615 
1616 	if (ceph_inode_is_shutdown(inode))
1617 		return -ESTALE;
1618 
1619 	if (direct_lock)
1620 		ceph_start_io_direct(inode);
1621 	else
1622 		ceph_start_io_read(inode);
1623 
1624 	if (!(fi->flags & CEPH_F_SYNC) && !direct_lock)
1625 		want |= CEPH_CAP_FILE_CACHE;
1626 	if (fi->fmode & CEPH_FILE_MODE_LAZY)
1627 		want |= CEPH_CAP_FILE_LAZYIO;
1628 
1629 	ret = ceph_get_caps(filp, CEPH_CAP_FILE_RD, want, -1, &got);
1630 	if (ret < 0) {
1631 		if (direct_lock)
1632 			ceph_end_io_direct(inode);
1633 		else
1634 			ceph_end_io_read(inode);
1635 		return ret;
1636 	}
1637 
1638 	if ((got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0 ||
1639 	    (iocb->ki_flags & IOCB_DIRECT) ||
1640 	    (fi->flags & CEPH_F_SYNC)) {
1641 
1642 		dout("aio_sync_read %p %llx.%llx %llu~%u got cap refs on %s\n",
1643 		     inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
1644 		     ceph_cap_string(got));
1645 
1646 		if (!ceph_has_inline_data(ci)) {
1647 			if (!retry_op && (iocb->ki_flags & IOCB_DIRECT)) {
1648 				ret = ceph_direct_read_write(iocb, to,
1649 							     NULL, NULL);
1650 				if (ret >= 0 && ret < len)
1651 					retry_op = CHECK_EOF;
1652 			} else {
1653 				ret = ceph_sync_read(iocb, to, &retry_op);
1654 			}
1655 		} else {
1656 			retry_op = READ_INLINE;
1657 		}
1658 	} else {
1659 		CEPH_DEFINE_RW_CONTEXT(rw_ctx, got);
1660 		dout("aio_read %p %llx.%llx %llu~%u got cap refs on %s\n",
1661 		     inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
1662 		     ceph_cap_string(got));
1663 		ceph_add_rw_context(fi, &rw_ctx);
1664 		ret = generic_file_read_iter(iocb, to);
1665 		ceph_del_rw_context(fi, &rw_ctx);
1666 	}
1667 
1668 	dout("aio_read %p %llx.%llx dropping cap refs on %s = %d\n",
1669 	     inode, ceph_vinop(inode), ceph_cap_string(got), (int)ret);
1670 	ceph_put_cap_refs(ci, got);
1671 
1672 	if (direct_lock)
1673 		ceph_end_io_direct(inode);
1674 	else
1675 		ceph_end_io_read(inode);
1676 
1677 	if (retry_op > HAVE_RETRIED && ret >= 0) {
1678 		int statret;
1679 		struct page *page = NULL;
1680 		loff_t i_size;
1681 		if (retry_op == READ_INLINE) {
1682 			page = __page_cache_alloc(GFP_KERNEL);
1683 			if (!page)
1684 				return -ENOMEM;
1685 		}
1686 
1687 		statret = __ceph_do_getattr(inode, page,
1688 					    CEPH_STAT_CAP_INLINE_DATA, !!page);
1689 		if (statret < 0) {
1690 			if (page)
1691 				__free_page(page);
1692 			if (statret == -ENODATA) {
1693 				BUG_ON(retry_op != READ_INLINE);
1694 				goto again;
1695 			}
1696 			return statret;
1697 		}
1698 
1699 		i_size = i_size_read(inode);
1700 		if (retry_op == READ_INLINE) {
1701 			BUG_ON(ret > 0 || read > 0);
1702 			if (iocb->ki_pos < i_size &&
1703 			    iocb->ki_pos < PAGE_SIZE) {
1704 				loff_t end = min_t(loff_t, i_size,
1705 						   iocb->ki_pos + len);
1706 				end = min_t(loff_t, end, PAGE_SIZE);
1707 				if (statret < end)
1708 					zero_user_segment(page, statret, end);
1709 				ret = copy_page_to_iter(page,
1710 						iocb->ki_pos & ~PAGE_MASK,
1711 						end - iocb->ki_pos, to);
1712 				iocb->ki_pos += ret;
1713 				read += ret;
1714 			}
1715 			if (iocb->ki_pos < i_size && read < len) {
1716 				size_t zlen = min_t(size_t, len - read,
1717 						    i_size - iocb->ki_pos);
1718 				ret = iov_iter_zero(zlen, to);
1719 				iocb->ki_pos += ret;
1720 				read += ret;
1721 			}
1722 			__free_pages(page, 0);
1723 			return read;
1724 		}
1725 
1726 		/* hit EOF or hole? */
1727 		if (retry_op == CHECK_EOF && iocb->ki_pos < i_size &&
1728 		    ret < len) {
1729 			dout("sync_read hit hole, ppos %lld < size %lld"
1730 			     ", reading more\n", iocb->ki_pos, i_size);
1731 
1732 			read += ret;
1733 			len -= ret;
1734 			retry_op = HAVE_RETRIED;
1735 			goto again;
1736 		}
1737 	}
1738 
1739 	if (ret >= 0)
1740 		ret += read;
1741 
1742 	return ret;
1743 }
1744 
1745 /*
1746  * Take cap references to avoid releasing caps to MDS mid-write.
1747  *
1748  * If we are synchronous, and write with an old snap context, the OSD
1749  * may return EOLDSNAPC.  In that case, retry the write.. _after_
1750  * dropping our cap refs and allowing the pending snap to logically
1751  * complete _before_ this write occurs.
1752  *
1753  * If we are near ENOSPC, write synchronously.
1754  */
ceph_write_iter(struct kiocb * iocb,struct iov_iter * from)1755 static ssize_t ceph_write_iter(struct kiocb *iocb, struct iov_iter *from)
1756 {
1757 	struct file *file = iocb->ki_filp;
1758 	struct ceph_file_info *fi = file->private_data;
1759 	struct inode *inode = file_inode(file);
1760 	struct ceph_inode_info *ci = ceph_inode(inode);
1761 	struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1762 	struct ceph_osd_client *osdc = &fsc->client->osdc;
1763 	struct ceph_cap_flush *prealloc_cf;
1764 	ssize_t count, written = 0;
1765 	int err, want = 0, got;
1766 	bool direct_lock = false;
1767 	u32 map_flags;
1768 	u64 pool_flags;
1769 	loff_t pos;
1770 	loff_t limit = max(i_size_read(inode), fsc->max_file_size);
1771 
1772 	if (ceph_inode_is_shutdown(inode))
1773 		return -ESTALE;
1774 
1775 	if (ceph_snap(inode) != CEPH_NOSNAP)
1776 		return -EROFS;
1777 
1778 	prealloc_cf = ceph_alloc_cap_flush();
1779 	if (!prealloc_cf)
1780 		return -ENOMEM;
1781 
1782 	if ((iocb->ki_flags & (IOCB_DIRECT | IOCB_APPEND)) == IOCB_DIRECT)
1783 		direct_lock = true;
1784 
1785 retry_snap:
1786 	if (direct_lock)
1787 		ceph_start_io_direct(inode);
1788 	else
1789 		ceph_start_io_write(inode);
1790 
1791 	/* We can write back this queue in page reclaim */
1792 	current->backing_dev_info = inode_to_bdi(inode);
1793 
1794 	if (iocb->ki_flags & IOCB_APPEND) {
1795 		err = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false);
1796 		if (err < 0)
1797 			goto out;
1798 	}
1799 
1800 	err = generic_write_checks(iocb, from);
1801 	if (err <= 0)
1802 		goto out;
1803 
1804 	pos = iocb->ki_pos;
1805 	if (unlikely(pos >= limit)) {
1806 		err = -EFBIG;
1807 		goto out;
1808 	} else {
1809 		iov_iter_truncate(from, limit - pos);
1810 	}
1811 
1812 	count = iov_iter_count(from);
1813 	if (ceph_quota_is_max_bytes_exceeded(inode, pos + count)) {
1814 		err = -EDQUOT;
1815 		goto out;
1816 	}
1817 
1818 	down_read(&osdc->lock);
1819 	map_flags = osdc->osdmap->flags;
1820 	pool_flags = ceph_pg_pool_flags(osdc->osdmap, ci->i_layout.pool_id);
1821 	up_read(&osdc->lock);
1822 	if ((map_flags & CEPH_OSDMAP_FULL) ||
1823 	    (pool_flags & CEPH_POOL_FLAG_FULL)) {
1824 		err = -ENOSPC;
1825 		goto out;
1826 	}
1827 
1828 	err = file_remove_privs(file);
1829 	if (err)
1830 		goto out;
1831 
1832 	dout("aio_write %p %llx.%llx %llu~%zd getting caps. i_size %llu\n",
1833 	     inode, ceph_vinop(inode), pos, count, i_size_read(inode));
1834 	if (!(fi->flags & CEPH_F_SYNC) && !direct_lock)
1835 		want |= CEPH_CAP_FILE_BUFFER;
1836 	if (fi->fmode & CEPH_FILE_MODE_LAZY)
1837 		want |= CEPH_CAP_FILE_LAZYIO;
1838 	got = 0;
1839 	err = ceph_get_caps(file, CEPH_CAP_FILE_WR, want, pos + count, &got);
1840 	if (err < 0)
1841 		goto out;
1842 
1843 	err = file_update_time(file);
1844 	if (err)
1845 		goto out_caps;
1846 
1847 	inode_inc_iversion_raw(inode);
1848 
1849 	dout("aio_write %p %llx.%llx %llu~%zd got cap refs on %s\n",
1850 	     inode, ceph_vinop(inode), pos, count, ceph_cap_string(got));
1851 
1852 	if ((got & (CEPH_CAP_FILE_BUFFER|CEPH_CAP_FILE_LAZYIO)) == 0 ||
1853 	    (iocb->ki_flags & IOCB_DIRECT) || (fi->flags & CEPH_F_SYNC) ||
1854 	    (ci->i_ceph_flags & CEPH_I_ERROR_WRITE)) {
1855 		struct ceph_snap_context *snapc;
1856 		struct iov_iter data;
1857 
1858 		spin_lock(&ci->i_ceph_lock);
1859 		if (__ceph_have_pending_cap_snap(ci)) {
1860 			struct ceph_cap_snap *capsnap =
1861 					list_last_entry(&ci->i_cap_snaps,
1862 							struct ceph_cap_snap,
1863 							ci_item);
1864 			snapc = ceph_get_snap_context(capsnap->context);
1865 		} else {
1866 			BUG_ON(!ci->i_head_snapc);
1867 			snapc = ceph_get_snap_context(ci->i_head_snapc);
1868 		}
1869 		spin_unlock(&ci->i_ceph_lock);
1870 
1871 		/* we might need to revert back to that point */
1872 		data = *from;
1873 		if (iocb->ki_flags & IOCB_DIRECT)
1874 			written = ceph_direct_read_write(iocb, &data, snapc,
1875 							 &prealloc_cf);
1876 		else
1877 			written = ceph_sync_write(iocb, &data, pos, snapc);
1878 		if (direct_lock)
1879 			ceph_end_io_direct(inode);
1880 		else
1881 			ceph_end_io_write(inode);
1882 		if (written > 0)
1883 			iov_iter_advance(from, written);
1884 		ceph_put_snap_context(snapc);
1885 	} else {
1886 		/*
1887 		 * No need to acquire the i_truncate_mutex. Because
1888 		 * the MDS revokes Fwb caps before sending truncate
1889 		 * message to us. We can't get Fwb cap while there
1890 		 * are pending vmtruncate. So write and vmtruncate
1891 		 * can not run at the same time
1892 		 */
1893 		written = generic_perform_write(iocb, from);
1894 		if (likely(written >= 0))
1895 			iocb->ki_pos = pos + written;
1896 		ceph_end_io_write(inode);
1897 	}
1898 
1899 	if (written >= 0) {
1900 		int dirty;
1901 
1902 		spin_lock(&ci->i_ceph_lock);
1903 		dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
1904 					       &prealloc_cf);
1905 		spin_unlock(&ci->i_ceph_lock);
1906 		if (dirty)
1907 			__mark_inode_dirty(inode, dirty);
1908 		if (ceph_quota_is_max_bytes_approaching(inode, iocb->ki_pos))
1909 			ceph_check_caps(ci, CHECK_CAPS_FLUSH, NULL);
1910 	}
1911 
1912 	dout("aio_write %p %llx.%llx %llu~%u  dropping cap refs on %s\n",
1913 	     inode, ceph_vinop(inode), pos, (unsigned)count,
1914 	     ceph_cap_string(got));
1915 	ceph_put_cap_refs(ci, got);
1916 
1917 	if (written == -EOLDSNAPC) {
1918 		dout("aio_write %p %llx.%llx %llu~%u" "got EOLDSNAPC, retrying\n",
1919 		     inode, ceph_vinop(inode), pos, (unsigned)count);
1920 		goto retry_snap;
1921 	}
1922 
1923 	if (written >= 0) {
1924 		if ((map_flags & CEPH_OSDMAP_NEARFULL) ||
1925 		    (pool_flags & CEPH_POOL_FLAG_NEARFULL))
1926 			iocb->ki_flags |= IOCB_DSYNC;
1927 		written = generic_write_sync(iocb, written);
1928 	}
1929 
1930 	goto out_unlocked;
1931 out_caps:
1932 	ceph_put_cap_refs(ci, got);
1933 out:
1934 	if (direct_lock)
1935 		ceph_end_io_direct(inode);
1936 	else
1937 		ceph_end_io_write(inode);
1938 out_unlocked:
1939 	ceph_free_cap_flush(prealloc_cf);
1940 	current->backing_dev_info = NULL;
1941 	return written ? written : err;
1942 }
1943 
1944 /*
1945  * llseek.  be sure to verify file size on SEEK_END.
1946  */
ceph_llseek(struct file * file,loff_t offset,int whence)1947 static loff_t ceph_llseek(struct file *file, loff_t offset, int whence)
1948 {
1949 	if (whence == SEEK_END || whence == SEEK_DATA || whence == SEEK_HOLE) {
1950 		struct inode *inode = file_inode(file);
1951 		int ret;
1952 
1953 		ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false);
1954 		if (ret < 0)
1955 			return ret;
1956 	}
1957 	return generic_file_llseek(file, offset, whence);
1958 }
1959 
ceph_zero_partial_page(struct inode * inode,loff_t offset,unsigned size)1960 static inline void ceph_zero_partial_page(
1961 	struct inode *inode, loff_t offset, unsigned size)
1962 {
1963 	struct page *page;
1964 	pgoff_t index = offset >> PAGE_SHIFT;
1965 
1966 	page = find_lock_page(inode->i_mapping, index);
1967 	if (page) {
1968 		wait_on_page_writeback(page);
1969 		zero_user(page, offset & (PAGE_SIZE - 1), size);
1970 		unlock_page(page);
1971 		put_page(page);
1972 	}
1973 }
1974 
ceph_zero_pagecache_range(struct inode * inode,loff_t offset,loff_t length)1975 static void ceph_zero_pagecache_range(struct inode *inode, loff_t offset,
1976 				      loff_t length)
1977 {
1978 	loff_t nearly = round_up(offset, PAGE_SIZE);
1979 	if (offset < nearly) {
1980 		loff_t size = nearly - offset;
1981 		if (length < size)
1982 			size = length;
1983 		ceph_zero_partial_page(inode, offset, size);
1984 		offset += size;
1985 		length -= size;
1986 	}
1987 	if (length >= PAGE_SIZE) {
1988 		loff_t size = round_down(length, PAGE_SIZE);
1989 		truncate_pagecache_range(inode, offset, offset + size - 1);
1990 		offset += size;
1991 		length -= size;
1992 	}
1993 	if (length)
1994 		ceph_zero_partial_page(inode, offset, length);
1995 }
1996 
ceph_zero_partial_object(struct inode * inode,loff_t offset,loff_t * length)1997 static int ceph_zero_partial_object(struct inode *inode,
1998 				    loff_t offset, loff_t *length)
1999 {
2000 	struct ceph_inode_info *ci = ceph_inode(inode);
2001 	struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
2002 	struct ceph_osd_request *req;
2003 	int ret = 0;
2004 	loff_t zero = 0;
2005 	int op;
2006 
2007 	if (!length) {
2008 		op = offset ? CEPH_OSD_OP_DELETE : CEPH_OSD_OP_TRUNCATE;
2009 		length = &zero;
2010 	} else {
2011 		op = CEPH_OSD_OP_ZERO;
2012 	}
2013 
2014 	req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
2015 					ceph_vino(inode),
2016 					offset, length,
2017 					0, 1, op,
2018 					CEPH_OSD_FLAG_WRITE,
2019 					NULL, 0, 0, false);
2020 	if (IS_ERR(req)) {
2021 		ret = PTR_ERR(req);
2022 		goto out;
2023 	}
2024 
2025 	req->r_mtime = inode->i_mtime;
2026 	ceph_osdc_start_request(&fsc->client->osdc, req);
2027 	ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
2028 	if (ret == -ENOENT)
2029 		ret = 0;
2030 	ceph_osdc_put_request(req);
2031 
2032 out:
2033 	return ret;
2034 }
2035 
ceph_zero_objects(struct inode * inode,loff_t offset,loff_t length)2036 static int ceph_zero_objects(struct inode *inode, loff_t offset, loff_t length)
2037 {
2038 	int ret = 0;
2039 	struct ceph_inode_info *ci = ceph_inode(inode);
2040 	s32 stripe_unit = ci->i_layout.stripe_unit;
2041 	s32 stripe_count = ci->i_layout.stripe_count;
2042 	s32 object_size = ci->i_layout.object_size;
2043 	u64 object_set_size = object_size * stripe_count;
2044 	u64 nearly, t;
2045 
2046 	/* round offset up to next period boundary */
2047 	nearly = offset + object_set_size - 1;
2048 	t = nearly;
2049 	nearly -= do_div(t, object_set_size);
2050 
2051 	while (length && offset < nearly) {
2052 		loff_t size = length;
2053 		ret = ceph_zero_partial_object(inode, offset, &size);
2054 		if (ret < 0)
2055 			return ret;
2056 		offset += size;
2057 		length -= size;
2058 	}
2059 	while (length >= object_set_size) {
2060 		int i;
2061 		loff_t pos = offset;
2062 		for (i = 0; i < stripe_count; ++i) {
2063 			ret = ceph_zero_partial_object(inode, pos, NULL);
2064 			if (ret < 0)
2065 				return ret;
2066 			pos += stripe_unit;
2067 		}
2068 		offset += object_set_size;
2069 		length -= object_set_size;
2070 	}
2071 	while (length) {
2072 		loff_t size = length;
2073 		ret = ceph_zero_partial_object(inode, offset, &size);
2074 		if (ret < 0)
2075 			return ret;
2076 		offset += size;
2077 		length -= size;
2078 	}
2079 	return ret;
2080 }
2081 
ceph_fallocate(struct file * file,int mode,loff_t offset,loff_t length)2082 static long ceph_fallocate(struct file *file, int mode,
2083 				loff_t offset, loff_t length)
2084 {
2085 	struct ceph_file_info *fi = file->private_data;
2086 	struct inode *inode = file_inode(file);
2087 	struct ceph_inode_info *ci = ceph_inode(inode);
2088 	struct ceph_cap_flush *prealloc_cf;
2089 	int want, got = 0;
2090 	int dirty;
2091 	int ret = 0;
2092 	loff_t endoff = 0;
2093 	loff_t size;
2094 
2095 	if (mode != (FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
2096 		return -EOPNOTSUPP;
2097 
2098 	if (!S_ISREG(inode->i_mode))
2099 		return -EOPNOTSUPP;
2100 
2101 	prealloc_cf = ceph_alloc_cap_flush();
2102 	if (!prealloc_cf)
2103 		return -ENOMEM;
2104 
2105 	inode_lock(inode);
2106 
2107 	if (ceph_snap(inode) != CEPH_NOSNAP) {
2108 		ret = -EROFS;
2109 		goto unlock;
2110 	}
2111 
2112 	size = i_size_read(inode);
2113 
2114 	/* Are we punching a hole beyond EOF? */
2115 	if (offset >= size)
2116 		goto unlock;
2117 	if ((offset + length) > size)
2118 		length = size - offset;
2119 
2120 	if (fi->fmode & CEPH_FILE_MODE_LAZY)
2121 		want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
2122 	else
2123 		want = CEPH_CAP_FILE_BUFFER;
2124 
2125 	ret = ceph_get_caps(file, CEPH_CAP_FILE_WR, want, endoff, &got);
2126 	if (ret < 0)
2127 		goto unlock;
2128 
2129 	filemap_invalidate_lock(inode->i_mapping);
2130 	ceph_fscache_invalidate(inode, false);
2131 	ceph_zero_pagecache_range(inode, offset, length);
2132 	ret = ceph_zero_objects(inode, offset, length);
2133 
2134 	if (!ret) {
2135 		spin_lock(&ci->i_ceph_lock);
2136 		dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
2137 					       &prealloc_cf);
2138 		spin_unlock(&ci->i_ceph_lock);
2139 		if (dirty)
2140 			__mark_inode_dirty(inode, dirty);
2141 	}
2142 	filemap_invalidate_unlock(inode->i_mapping);
2143 
2144 	ceph_put_cap_refs(ci, got);
2145 unlock:
2146 	inode_unlock(inode);
2147 	ceph_free_cap_flush(prealloc_cf);
2148 	return ret;
2149 }
2150 
2151 /*
2152  * This function tries to get FILE_WR capabilities for dst_ci and FILE_RD for
2153  * src_ci.  Two attempts are made to obtain both caps, and an error is return if
2154  * this fails; zero is returned on success.
2155  */
get_rd_wr_caps(struct file * src_filp,int * src_got,struct file * dst_filp,loff_t dst_endoff,int * dst_got)2156 static int get_rd_wr_caps(struct file *src_filp, int *src_got,
2157 			  struct file *dst_filp,
2158 			  loff_t dst_endoff, int *dst_got)
2159 {
2160 	int ret = 0;
2161 	bool retrying = false;
2162 
2163 retry_caps:
2164 	ret = ceph_get_caps(dst_filp, CEPH_CAP_FILE_WR, CEPH_CAP_FILE_BUFFER,
2165 			    dst_endoff, dst_got);
2166 	if (ret < 0)
2167 		return ret;
2168 
2169 	/*
2170 	 * Since we're already holding the FILE_WR capability for the dst file,
2171 	 * we would risk a deadlock by using ceph_get_caps.  Thus, we'll do some
2172 	 * retry dance instead to try to get both capabilities.
2173 	 */
2174 	ret = ceph_try_get_caps(file_inode(src_filp),
2175 				CEPH_CAP_FILE_RD, CEPH_CAP_FILE_SHARED,
2176 				false, src_got);
2177 	if (ret <= 0) {
2178 		/* Start by dropping dst_ci caps and getting src_ci caps */
2179 		ceph_put_cap_refs(ceph_inode(file_inode(dst_filp)), *dst_got);
2180 		if (retrying) {
2181 			if (!ret)
2182 				/* ceph_try_get_caps masks EAGAIN */
2183 				ret = -EAGAIN;
2184 			return ret;
2185 		}
2186 		ret = ceph_get_caps(src_filp, CEPH_CAP_FILE_RD,
2187 				    CEPH_CAP_FILE_SHARED, -1, src_got);
2188 		if (ret < 0)
2189 			return ret;
2190 		/*... drop src_ci caps too, and retry */
2191 		ceph_put_cap_refs(ceph_inode(file_inode(src_filp)), *src_got);
2192 		retrying = true;
2193 		goto retry_caps;
2194 	}
2195 	return ret;
2196 }
2197 
put_rd_wr_caps(struct ceph_inode_info * src_ci,int src_got,struct ceph_inode_info * dst_ci,int dst_got)2198 static void put_rd_wr_caps(struct ceph_inode_info *src_ci, int src_got,
2199 			   struct ceph_inode_info *dst_ci, int dst_got)
2200 {
2201 	ceph_put_cap_refs(src_ci, src_got);
2202 	ceph_put_cap_refs(dst_ci, dst_got);
2203 }
2204 
2205 /*
2206  * This function does several size-related checks, returning an error if:
2207  *  - source file is smaller than off+len
2208  *  - destination file size is not OK (inode_newsize_ok())
2209  *  - max bytes quotas is exceeded
2210  */
is_file_size_ok(struct inode * src_inode,struct inode * dst_inode,loff_t src_off,loff_t dst_off,size_t len)2211 static int is_file_size_ok(struct inode *src_inode, struct inode *dst_inode,
2212 			   loff_t src_off, loff_t dst_off, size_t len)
2213 {
2214 	loff_t size, endoff;
2215 
2216 	size = i_size_read(src_inode);
2217 	/*
2218 	 * Don't copy beyond source file EOF.  Instead of simply setting length
2219 	 * to (size - src_off), just drop to VFS default implementation, as the
2220 	 * local i_size may be stale due to other clients writing to the source
2221 	 * inode.
2222 	 */
2223 	if (src_off + len > size) {
2224 		dout("Copy beyond EOF (%llu + %zu > %llu)\n",
2225 		     src_off, len, size);
2226 		return -EOPNOTSUPP;
2227 	}
2228 	size = i_size_read(dst_inode);
2229 
2230 	endoff = dst_off + len;
2231 	if (inode_newsize_ok(dst_inode, endoff))
2232 		return -EOPNOTSUPP;
2233 
2234 	if (ceph_quota_is_max_bytes_exceeded(dst_inode, endoff))
2235 		return -EDQUOT;
2236 
2237 	return 0;
2238 }
2239 
2240 static struct ceph_osd_request *
ceph_alloc_copyfrom_request(struct ceph_osd_client * osdc,u64 src_snapid,struct ceph_object_id * src_oid,struct ceph_object_locator * src_oloc,struct ceph_object_id * dst_oid,struct ceph_object_locator * dst_oloc,u32 truncate_seq,u64 truncate_size)2241 ceph_alloc_copyfrom_request(struct ceph_osd_client *osdc,
2242 			    u64 src_snapid,
2243 			    struct ceph_object_id *src_oid,
2244 			    struct ceph_object_locator *src_oloc,
2245 			    struct ceph_object_id *dst_oid,
2246 			    struct ceph_object_locator *dst_oloc,
2247 			    u32 truncate_seq, u64 truncate_size)
2248 {
2249 	struct ceph_osd_request *req;
2250 	int ret;
2251 	u32 src_fadvise_flags =
2252 		CEPH_OSD_OP_FLAG_FADVISE_SEQUENTIAL |
2253 		CEPH_OSD_OP_FLAG_FADVISE_NOCACHE;
2254 	u32 dst_fadvise_flags =
2255 		CEPH_OSD_OP_FLAG_FADVISE_SEQUENTIAL |
2256 		CEPH_OSD_OP_FLAG_FADVISE_DONTNEED;
2257 
2258 	req = ceph_osdc_alloc_request(osdc, NULL, 1, false, GFP_KERNEL);
2259 	if (!req)
2260 		return ERR_PTR(-ENOMEM);
2261 
2262 	req->r_flags = CEPH_OSD_FLAG_WRITE;
2263 
2264 	ceph_oloc_copy(&req->r_t.base_oloc, dst_oloc);
2265 	ceph_oid_copy(&req->r_t.base_oid, dst_oid);
2266 
2267 	ret = osd_req_op_copy_from_init(req, src_snapid, 0,
2268 					src_oid, src_oloc,
2269 					src_fadvise_flags,
2270 					dst_fadvise_flags,
2271 					truncate_seq,
2272 					truncate_size,
2273 					CEPH_OSD_COPY_FROM_FLAG_TRUNCATE_SEQ);
2274 	if (ret)
2275 		goto out;
2276 
2277 	ret = ceph_osdc_alloc_messages(req, GFP_KERNEL);
2278 	if (ret)
2279 		goto out;
2280 
2281 	return req;
2282 
2283 out:
2284 	ceph_osdc_put_request(req);
2285 	return ERR_PTR(ret);
2286 }
2287 
ceph_do_objects_copy(struct ceph_inode_info * src_ci,u64 * src_off,struct ceph_inode_info * dst_ci,u64 * dst_off,struct ceph_fs_client * fsc,size_t len,unsigned int flags)2288 static ssize_t ceph_do_objects_copy(struct ceph_inode_info *src_ci, u64 *src_off,
2289 				    struct ceph_inode_info *dst_ci, u64 *dst_off,
2290 				    struct ceph_fs_client *fsc,
2291 				    size_t len, unsigned int flags)
2292 {
2293 	struct ceph_object_locator src_oloc, dst_oloc;
2294 	struct ceph_object_id src_oid, dst_oid;
2295 	struct ceph_osd_client *osdc;
2296 	struct ceph_osd_request *req;
2297 	size_t bytes = 0;
2298 	u64 src_objnum, src_objoff, dst_objnum, dst_objoff;
2299 	u32 src_objlen, dst_objlen;
2300 	u32 object_size = src_ci->i_layout.object_size;
2301 	int ret;
2302 
2303 	src_oloc.pool = src_ci->i_layout.pool_id;
2304 	src_oloc.pool_ns = ceph_try_get_string(src_ci->i_layout.pool_ns);
2305 	dst_oloc.pool = dst_ci->i_layout.pool_id;
2306 	dst_oloc.pool_ns = ceph_try_get_string(dst_ci->i_layout.pool_ns);
2307 	osdc = &fsc->client->osdc;
2308 
2309 	while (len >= object_size) {
2310 		ceph_calc_file_object_mapping(&src_ci->i_layout, *src_off,
2311 					      object_size, &src_objnum,
2312 					      &src_objoff, &src_objlen);
2313 		ceph_calc_file_object_mapping(&dst_ci->i_layout, *dst_off,
2314 					      object_size, &dst_objnum,
2315 					      &dst_objoff, &dst_objlen);
2316 		ceph_oid_init(&src_oid);
2317 		ceph_oid_printf(&src_oid, "%llx.%08llx",
2318 				src_ci->i_vino.ino, src_objnum);
2319 		ceph_oid_init(&dst_oid);
2320 		ceph_oid_printf(&dst_oid, "%llx.%08llx",
2321 				dst_ci->i_vino.ino, dst_objnum);
2322 		/* Do an object remote copy */
2323 		req = ceph_alloc_copyfrom_request(osdc, src_ci->i_vino.snap,
2324 						  &src_oid, &src_oloc,
2325 						  &dst_oid, &dst_oloc,
2326 						  dst_ci->i_truncate_seq,
2327 						  dst_ci->i_truncate_size);
2328 		if (IS_ERR(req))
2329 			ret = PTR_ERR(req);
2330 		else {
2331 			ceph_osdc_start_request(osdc, req);
2332 			ret = ceph_osdc_wait_request(osdc, req);
2333 			ceph_update_copyfrom_metrics(&fsc->mdsc->metric,
2334 						     req->r_start_latency,
2335 						     req->r_end_latency,
2336 						     object_size, ret);
2337 			ceph_osdc_put_request(req);
2338 		}
2339 		if (ret) {
2340 			if (ret == -EOPNOTSUPP) {
2341 				fsc->have_copy_from2 = false;
2342 				pr_notice("OSDs don't support copy-from2; disabling copy offload\n");
2343 			}
2344 			dout("ceph_osdc_copy_from returned %d\n", ret);
2345 			if (!bytes)
2346 				bytes = ret;
2347 			goto out;
2348 		}
2349 		len -= object_size;
2350 		bytes += object_size;
2351 		*src_off += object_size;
2352 		*dst_off += object_size;
2353 	}
2354 
2355 out:
2356 	ceph_oloc_destroy(&src_oloc);
2357 	ceph_oloc_destroy(&dst_oloc);
2358 	return bytes;
2359 }
2360 
__ceph_copy_file_range(struct file * src_file,loff_t src_off,struct file * dst_file,loff_t dst_off,size_t len,unsigned int flags)2361 static ssize_t __ceph_copy_file_range(struct file *src_file, loff_t src_off,
2362 				      struct file *dst_file, loff_t dst_off,
2363 				      size_t len, unsigned int flags)
2364 {
2365 	struct inode *src_inode = file_inode(src_file);
2366 	struct inode *dst_inode = file_inode(dst_file);
2367 	struct ceph_inode_info *src_ci = ceph_inode(src_inode);
2368 	struct ceph_inode_info *dst_ci = ceph_inode(dst_inode);
2369 	struct ceph_cap_flush *prealloc_cf;
2370 	struct ceph_fs_client *src_fsc = ceph_inode_to_client(src_inode);
2371 	loff_t size;
2372 	ssize_t ret = -EIO, bytes;
2373 	u64 src_objnum, dst_objnum, src_objoff, dst_objoff;
2374 	u32 src_objlen, dst_objlen;
2375 	int src_got = 0, dst_got = 0, err, dirty;
2376 
2377 	if (src_inode->i_sb != dst_inode->i_sb) {
2378 		struct ceph_fs_client *dst_fsc = ceph_inode_to_client(dst_inode);
2379 
2380 		if (ceph_fsid_compare(&src_fsc->client->fsid,
2381 				      &dst_fsc->client->fsid)) {
2382 			dout("Copying files across clusters: src: %pU dst: %pU\n",
2383 			     &src_fsc->client->fsid, &dst_fsc->client->fsid);
2384 			return -EXDEV;
2385 		}
2386 	}
2387 	if (ceph_snap(dst_inode) != CEPH_NOSNAP)
2388 		return -EROFS;
2389 
2390 	/*
2391 	 * Some of the checks below will return -EOPNOTSUPP, which will force a
2392 	 * fallback to the default VFS copy_file_range implementation.  This is
2393 	 * desirable in several cases (for ex, the 'len' is smaller than the
2394 	 * size of the objects, or in cases where that would be more
2395 	 * efficient).
2396 	 */
2397 
2398 	if (ceph_test_mount_opt(src_fsc, NOCOPYFROM))
2399 		return -EOPNOTSUPP;
2400 
2401 	if (!src_fsc->have_copy_from2)
2402 		return -EOPNOTSUPP;
2403 
2404 	/*
2405 	 * Striped file layouts require that we copy partial objects, but the
2406 	 * OSD copy-from operation only supports full-object copies.  Limit
2407 	 * this to non-striped file layouts for now.
2408 	 */
2409 	if ((src_ci->i_layout.stripe_unit != dst_ci->i_layout.stripe_unit) ||
2410 	    (src_ci->i_layout.stripe_count != 1) ||
2411 	    (dst_ci->i_layout.stripe_count != 1) ||
2412 	    (src_ci->i_layout.object_size != dst_ci->i_layout.object_size)) {
2413 		dout("Invalid src/dst files layout\n");
2414 		return -EOPNOTSUPP;
2415 	}
2416 
2417 	if (len < src_ci->i_layout.object_size)
2418 		return -EOPNOTSUPP; /* no remote copy will be done */
2419 
2420 	prealloc_cf = ceph_alloc_cap_flush();
2421 	if (!prealloc_cf)
2422 		return -ENOMEM;
2423 
2424 	/* Start by sync'ing the source and destination files */
2425 	ret = file_write_and_wait_range(src_file, src_off, (src_off + len));
2426 	if (ret < 0) {
2427 		dout("failed to write src file (%zd)\n", ret);
2428 		goto out;
2429 	}
2430 	ret = file_write_and_wait_range(dst_file, dst_off, (dst_off + len));
2431 	if (ret < 0) {
2432 		dout("failed to write dst file (%zd)\n", ret);
2433 		goto out;
2434 	}
2435 
2436 	/*
2437 	 * We need FILE_WR caps for dst_ci and FILE_RD for src_ci as other
2438 	 * clients may have dirty data in their caches.  And OSDs know nothing
2439 	 * about caps, so they can't safely do the remote object copies.
2440 	 */
2441 	err = get_rd_wr_caps(src_file, &src_got,
2442 			     dst_file, (dst_off + len), &dst_got);
2443 	if (err < 0) {
2444 		dout("get_rd_wr_caps returned %d\n", err);
2445 		ret = -EOPNOTSUPP;
2446 		goto out;
2447 	}
2448 
2449 	ret = is_file_size_ok(src_inode, dst_inode, src_off, dst_off, len);
2450 	if (ret < 0)
2451 		goto out_caps;
2452 
2453 	/* Drop dst file cached pages */
2454 	ceph_fscache_invalidate(dst_inode, false);
2455 	ret = invalidate_inode_pages2_range(dst_inode->i_mapping,
2456 					    dst_off >> PAGE_SHIFT,
2457 					    (dst_off + len) >> PAGE_SHIFT);
2458 	if (ret < 0) {
2459 		dout("Failed to invalidate inode pages (%zd)\n", ret);
2460 		ret = 0; /* XXX */
2461 	}
2462 	ceph_calc_file_object_mapping(&src_ci->i_layout, src_off,
2463 				      src_ci->i_layout.object_size,
2464 				      &src_objnum, &src_objoff, &src_objlen);
2465 	ceph_calc_file_object_mapping(&dst_ci->i_layout, dst_off,
2466 				      dst_ci->i_layout.object_size,
2467 				      &dst_objnum, &dst_objoff, &dst_objlen);
2468 	/* object-level offsets need to the same */
2469 	if (src_objoff != dst_objoff) {
2470 		ret = -EOPNOTSUPP;
2471 		goto out_caps;
2472 	}
2473 
2474 	/*
2475 	 * Do a manual copy if the object offset isn't object aligned.
2476 	 * 'src_objlen' contains the bytes left until the end of the object,
2477 	 * starting at the src_off
2478 	 */
2479 	if (src_objoff) {
2480 		dout("Initial partial copy of %u bytes\n", src_objlen);
2481 
2482 		/*
2483 		 * we need to temporarily drop all caps as we'll be calling
2484 		 * {read,write}_iter, which will get caps again.
2485 		 */
2486 		put_rd_wr_caps(src_ci, src_got, dst_ci, dst_got);
2487 		ret = do_splice_direct(src_file, &src_off, dst_file,
2488 				       &dst_off, src_objlen, flags);
2489 		/* Abort on short copies or on error */
2490 		if (ret < src_objlen) {
2491 			dout("Failed partial copy (%zd)\n", ret);
2492 			goto out;
2493 		}
2494 		len -= ret;
2495 		err = get_rd_wr_caps(src_file, &src_got,
2496 				     dst_file, (dst_off + len), &dst_got);
2497 		if (err < 0)
2498 			goto out;
2499 		err = is_file_size_ok(src_inode, dst_inode,
2500 				      src_off, dst_off, len);
2501 		if (err < 0)
2502 			goto out_caps;
2503 	}
2504 
2505 	size = i_size_read(dst_inode);
2506 	bytes = ceph_do_objects_copy(src_ci, &src_off, dst_ci, &dst_off,
2507 				     src_fsc, len, flags);
2508 	if (bytes <= 0) {
2509 		if (!ret)
2510 			ret = bytes;
2511 		goto out_caps;
2512 	}
2513 	dout("Copied %zu bytes out of %zu\n", bytes, len);
2514 	len -= bytes;
2515 	ret += bytes;
2516 
2517 	file_update_time(dst_file);
2518 	inode_inc_iversion_raw(dst_inode);
2519 
2520 	if (dst_off > size) {
2521 		/* Let the MDS know about dst file size change */
2522 		if (ceph_inode_set_size(dst_inode, dst_off) ||
2523 		    ceph_quota_is_max_bytes_approaching(dst_inode, dst_off))
2524 			ceph_check_caps(dst_ci, CHECK_CAPS_AUTHONLY | CHECK_CAPS_FLUSH,
2525 					NULL);
2526 	}
2527 	/* Mark Fw dirty */
2528 	spin_lock(&dst_ci->i_ceph_lock);
2529 	dirty = __ceph_mark_dirty_caps(dst_ci, CEPH_CAP_FILE_WR, &prealloc_cf);
2530 	spin_unlock(&dst_ci->i_ceph_lock);
2531 	if (dirty)
2532 		__mark_inode_dirty(dst_inode, dirty);
2533 
2534 out_caps:
2535 	put_rd_wr_caps(src_ci, src_got, dst_ci, dst_got);
2536 
2537 	/*
2538 	 * Do the final manual copy if we still have some bytes left, unless
2539 	 * there were errors in remote object copies (len >= object_size).
2540 	 */
2541 	if (len && (len < src_ci->i_layout.object_size)) {
2542 		dout("Final partial copy of %zu bytes\n", len);
2543 		bytes = do_splice_direct(src_file, &src_off, dst_file,
2544 					 &dst_off, len, flags);
2545 		if (bytes > 0)
2546 			ret += bytes;
2547 		else
2548 			dout("Failed partial copy (%zd)\n", bytes);
2549 	}
2550 
2551 out:
2552 	ceph_free_cap_flush(prealloc_cf);
2553 
2554 	return ret;
2555 }
2556 
ceph_copy_file_range(struct file * src_file,loff_t src_off,struct file * dst_file,loff_t dst_off,size_t len,unsigned int flags)2557 static ssize_t ceph_copy_file_range(struct file *src_file, loff_t src_off,
2558 				    struct file *dst_file, loff_t dst_off,
2559 				    size_t len, unsigned int flags)
2560 {
2561 	ssize_t ret;
2562 
2563 	ret = __ceph_copy_file_range(src_file, src_off, dst_file, dst_off,
2564 				     len, flags);
2565 
2566 	if (ret == -EOPNOTSUPP || ret == -EXDEV)
2567 		ret = generic_copy_file_range(src_file, src_off, dst_file,
2568 					      dst_off, len, flags);
2569 	return ret;
2570 }
2571 
2572 const struct file_operations ceph_file_fops = {
2573 	.open = ceph_open,
2574 	.release = ceph_release,
2575 	.llseek = ceph_llseek,
2576 	.read_iter = ceph_read_iter,
2577 	.write_iter = ceph_write_iter,
2578 	.mmap = ceph_mmap,
2579 	.fsync = ceph_fsync,
2580 	.lock = ceph_lock,
2581 	.setlease = simple_nosetlease,
2582 	.flock = ceph_flock,
2583 	.splice_read = generic_file_splice_read,
2584 	.splice_write = iter_file_splice_write,
2585 	.unlocked_ioctl = ceph_ioctl,
2586 	.compat_ioctl = compat_ptr_ioctl,
2587 	.fallocate	= ceph_fallocate,
2588 	.copy_file_range = ceph_copy_file_range,
2589 };
2590