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_pages(iter, pages, maxsize - size,
99 					   ITER_GET_BVECS_PAGES, &start);
100 		if (bytes < 0)
101 			return size ?: bytes;
102 
103 		iov_iter_advance(iter, bytes);
104 		size += bytes;
105 
106 		for ( ; bytes; idx++, bvec_idx++) {
107 			struct bio_vec bv = {
108 				.bv_page = pages[idx],
109 				.bv_len = min_t(int, bytes, PAGE_SIZE - start),
110 				.bv_offset = start,
111 			};
112 
113 			bvecs[bvec_idx] = bv;
114 			bytes -= bv.bv_len;
115 			start = 0;
116 		}
117 	}
118 
119 	return size;
120 }
121 
122 /*
123  * iov_iter_get_pages() only considers one iov_iter segment, no matter
124  * what maxsize or maxpages are given.  For ITER_BVEC that is a single
125  * page.
126  *
127  * Attempt to get up to @maxsize bytes worth of pages from @iter.
128  * Return the number of bytes in the created bio_vec array, or an error.
129  */
iter_get_bvecs_alloc(struct iov_iter * iter,size_t maxsize,struct bio_vec ** bvecs,int * num_bvecs)130 static ssize_t iter_get_bvecs_alloc(struct iov_iter *iter, size_t maxsize,
131 				    struct bio_vec **bvecs, int *num_bvecs)
132 {
133 	struct bio_vec *bv;
134 	size_t orig_count = iov_iter_count(iter);
135 	ssize_t bytes;
136 	int npages;
137 
138 	iov_iter_truncate(iter, maxsize);
139 	npages = iov_iter_npages(iter, INT_MAX);
140 	iov_iter_reexpand(iter, orig_count);
141 
142 	/*
143 	 * __iter_get_bvecs() may populate only part of the array -- zero it
144 	 * out.
145 	 */
146 	bv = kvmalloc_array(npages, sizeof(*bv), GFP_KERNEL | __GFP_ZERO);
147 	if (!bv)
148 		return -ENOMEM;
149 
150 	bytes = __iter_get_bvecs(iter, maxsize, bv);
151 	if (bytes < 0) {
152 		/*
153 		 * No pages were pinned -- just free the array.
154 		 */
155 		kvfree(bv);
156 		return bytes;
157 	}
158 
159 	*bvecs = bv;
160 	*num_bvecs = npages;
161 	return bytes;
162 }
163 
put_bvecs(struct bio_vec * bvecs,int num_bvecs,bool should_dirty)164 static void put_bvecs(struct bio_vec *bvecs, int num_bvecs, bool should_dirty)
165 {
166 	int i;
167 
168 	for (i = 0; i < num_bvecs; i++) {
169 		if (bvecs[i].bv_page) {
170 			if (should_dirty)
171 				set_page_dirty_lock(bvecs[i].bv_page);
172 			put_page(bvecs[i].bv_page);
173 		}
174 	}
175 	kvfree(bvecs);
176 }
177 
178 /*
179  * Prepare an open request.  Preallocate ceph_cap to avoid an
180  * inopportune ENOMEM later.
181  */
182 static struct ceph_mds_request *
prepare_open_request(struct super_block * sb,int flags,int create_mode)183 prepare_open_request(struct super_block *sb, int flags, int create_mode)
184 {
185 	struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(sb);
186 	struct ceph_mds_request *req;
187 	int want_auth = USE_ANY_MDS;
188 	int op = (flags & O_CREAT) ? CEPH_MDS_OP_CREATE : CEPH_MDS_OP_OPEN;
189 
190 	if (flags & (O_WRONLY|O_RDWR|O_CREAT|O_TRUNC))
191 		want_auth = USE_AUTH_MDS;
192 
193 	req = ceph_mdsc_create_request(mdsc, op, want_auth);
194 	if (IS_ERR(req))
195 		goto out;
196 	req->r_fmode = ceph_flags_to_mode(flags);
197 	req->r_args.open.flags = ceph_flags_sys2wire(flags);
198 	req->r_args.open.mode = cpu_to_le32(create_mode);
199 out:
200 	return req;
201 }
202 
ceph_init_file_info(struct inode * inode,struct file * file,int fmode,bool isdir)203 static int ceph_init_file_info(struct inode *inode, struct file *file,
204 					int fmode, bool isdir)
205 {
206 	struct ceph_inode_info *ci = ceph_inode(inode);
207 	struct ceph_mount_options *opt =
208 		ceph_inode_to_client(&ci->netfs.inode)->mount_options;
209 	struct ceph_file_info *fi;
210 	int ret;
211 
212 	dout("%s %p %p 0%o (%s)\n", __func__, inode, file,
213 			inode->i_mode, isdir ? "dir" : "regular");
214 	BUG_ON(inode->i_fop->release != ceph_release);
215 
216 	if (isdir) {
217 		struct ceph_dir_file_info *dfi =
218 			kmem_cache_zalloc(ceph_dir_file_cachep, GFP_KERNEL);
219 		if (!dfi)
220 			return -ENOMEM;
221 
222 		file->private_data = dfi;
223 		fi = &dfi->file_info;
224 		dfi->next_offset = 2;
225 		dfi->readdir_cache_idx = -1;
226 	} else {
227 		fi = kmem_cache_zalloc(ceph_file_cachep, GFP_KERNEL);
228 		if (!fi)
229 			return -ENOMEM;
230 
231 		if (opt->flags & CEPH_MOUNT_OPT_NOPAGECACHE)
232 			fi->flags |= CEPH_F_SYNC;
233 
234 		file->private_data = fi;
235 	}
236 
237 	ceph_get_fmode(ci, fmode, 1);
238 	fi->fmode = fmode;
239 
240 	spin_lock_init(&fi->rw_contexts_lock);
241 	INIT_LIST_HEAD(&fi->rw_contexts);
242 	fi->filp_gen = READ_ONCE(ceph_inode_to_client(inode)->filp_gen);
243 
244 	if ((file->f_mode & FMODE_WRITE) &&
245 	    ci->i_inline_version != CEPH_INLINE_NONE) {
246 		ret = ceph_uninline_data(file);
247 		if (ret < 0)
248 			goto error;
249 	}
250 
251 	return 0;
252 
253 error:
254 	ceph_fscache_unuse_cookie(inode, file->f_mode & FMODE_WRITE);
255 	ceph_put_fmode(ci, fi->fmode, 1);
256 	kmem_cache_free(ceph_file_cachep, fi);
257 	/* wake up anyone waiting for caps on this inode */
258 	wake_up_all(&ci->i_cap_wq);
259 	return ret;
260 }
261 
262 /*
263  * initialize private struct file data.
264  * if we fail, clean up by dropping fmode reference on the ceph_inode
265  */
ceph_init_file(struct inode * inode,struct file * file,int fmode)266 static int ceph_init_file(struct inode *inode, struct file *file, int fmode)
267 {
268 	int ret = 0;
269 
270 	switch (inode->i_mode & S_IFMT) {
271 	case S_IFREG:
272 		ceph_fscache_use_cookie(inode, file->f_mode & FMODE_WRITE);
273 		fallthrough;
274 	case S_IFDIR:
275 		ret = ceph_init_file_info(inode, file, fmode,
276 						S_ISDIR(inode->i_mode));
277 		break;
278 
279 	case S_IFLNK:
280 		dout("init_file %p %p 0%o (symlink)\n", inode, file,
281 		     inode->i_mode);
282 		break;
283 
284 	default:
285 		dout("init_file %p %p 0%o (special)\n", inode, file,
286 		     inode->i_mode);
287 		/*
288 		 * we need to drop the open ref now, since we don't
289 		 * have .release set to ceph_release.
290 		 */
291 		BUG_ON(inode->i_fop->release == ceph_release);
292 
293 		/* call the proper open fop */
294 		ret = inode->i_fop->open(inode, file);
295 	}
296 	return ret;
297 }
298 
299 /*
300  * try renew caps after session gets killed.
301  */
ceph_renew_caps(struct inode * inode,int fmode)302 int ceph_renew_caps(struct inode *inode, int fmode)
303 {
304 	struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
305 	struct ceph_inode_info *ci = ceph_inode(inode);
306 	struct ceph_mds_request *req;
307 	int err, flags, wanted;
308 
309 	spin_lock(&ci->i_ceph_lock);
310 	__ceph_touch_fmode(ci, mdsc, fmode);
311 	wanted = __ceph_caps_file_wanted(ci);
312 	if (__ceph_is_any_real_caps(ci) &&
313 	    (!(wanted & CEPH_CAP_ANY_WR) || ci->i_auth_cap)) {
314 		int issued = __ceph_caps_issued(ci, NULL);
315 		spin_unlock(&ci->i_ceph_lock);
316 		dout("renew caps %p want %s issued %s updating mds_wanted\n",
317 		     inode, ceph_cap_string(wanted), ceph_cap_string(issued));
318 		ceph_check_caps(ci, 0, NULL);
319 		return 0;
320 	}
321 	spin_unlock(&ci->i_ceph_lock);
322 
323 	flags = 0;
324 	if ((wanted & CEPH_CAP_FILE_RD) && (wanted & CEPH_CAP_FILE_WR))
325 		flags = O_RDWR;
326 	else if (wanted & CEPH_CAP_FILE_RD)
327 		flags = O_RDONLY;
328 	else if (wanted & CEPH_CAP_FILE_WR)
329 		flags = O_WRONLY;
330 #ifdef O_LAZY
331 	if (wanted & CEPH_CAP_FILE_LAZYIO)
332 		flags |= O_LAZY;
333 #endif
334 
335 	req = prepare_open_request(inode->i_sb, flags, 0);
336 	if (IS_ERR(req)) {
337 		err = PTR_ERR(req);
338 		goto out;
339 	}
340 
341 	req->r_inode = inode;
342 	ihold(inode);
343 	req->r_num_caps = 1;
344 
345 	err = ceph_mdsc_do_request(mdsc, NULL, req);
346 	ceph_mdsc_put_request(req);
347 out:
348 	dout("renew caps %p open result=%d\n", inode, err);
349 	return err < 0 ? err : 0;
350 }
351 
352 /*
353  * If we already have the requisite capabilities, we can satisfy
354  * the open request locally (no need to request new caps from the
355  * MDS).  We do, however, need to inform the MDS (asynchronously)
356  * if our wanted caps set expands.
357  */
ceph_open(struct inode * inode,struct file * file)358 int ceph_open(struct inode *inode, struct file *file)
359 {
360 	struct ceph_inode_info *ci = ceph_inode(inode);
361 	struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
362 	struct ceph_mds_client *mdsc = fsc->mdsc;
363 	struct ceph_mds_request *req;
364 	struct ceph_file_info *fi = file->private_data;
365 	int err;
366 	int flags, fmode, wanted;
367 
368 	if (fi) {
369 		dout("open file %p is already opened\n", file);
370 		return 0;
371 	}
372 
373 	/* filter out O_CREAT|O_EXCL; vfs did that already.  yuck. */
374 	flags = file->f_flags & ~(O_CREAT|O_EXCL);
375 	if (S_ISDIR(inode->i_mode))
376 		flags = O_DIRECTORY;  /* mds likes to know */
377 
378 	dout("open inode %p ino %llx.%llx file %p flags %d (%d)\n", inode,
379 	     ceph_vinop(inode), file, flags, file->f_flags);
380 	fmode = ceph_flags_to_mode(flags);
381 	wanted = ceph_caps_for_mode(fmode);
382 
383 	/* snapped files are read-only */
384 	if (ceph_snap(inode) != CEPH_NOSNAP && (file->f_mode & FMODE_WRITE))
385 		return -EROFS;
386 
387 	/* trivially open snapdir */
388 	if (ceph_snap(inode) == CEPH_SNAPDIR) {
389 		return ceph_init_file(inode, file, fmode);
390 	}
391 
392 	/*
393 	 * No need to block if we have caps on the auth MDS (for
394 	 * write) or any MDS (for read).  Update wanted set
395 	 * asynchronously.
396 	 */
397 	spin_lock(&ci->i_ceph_lock);
398 	if (__ceph_is_any_real_caps(ci) &&
399 	    (((fmode & CEPH_FILE_MODE_WR) == 0) || ci->i_auth_cap)) {
400 		int mds_wanted = __ceph_caps_mds_wanted(ci, true);
401 		int issued = __ceph_caps_issued(ci, NULL);
402 
403 		dout("open %p fmode %d want %s issued %s using existing\n",
404 		     inode, fmode, ceph_cap_string(wanted),
405 		     ceph_cap_string(issued));
406 		__ceph_touch_fmode(ci, mdsc, fmode);
407 		spin_unlock(&ci->i_ceph_lock);
408 
409 		/* adjust wanted? */
410 		if ((issued & wanted) != wanted &&
411 		    (mds_wanted & wanted) != wanted &&
412 		    ceph_snap(inode) != CEPH_SNAPDIR)
413 			ceph_check_caps(ci, 0, NULL);
414 
415 		return ceph_init_file(inode, file, fmode);
416 	} else if (ceph_snap(inode) != CEPH_NOSNAP &&
417 		   (ci->i_snap_caps & wanted) == wanted) {
418 		__ceph_touch_fmode(ci, mdsc, fmode);
419 		spin_unlock(&ci->i_ceph_lock);
420 		return ceph_init_file(inode, file, fmode);
421 	}
422 
423 	spin_unlock(&ci->i_ceph_lock);
424 
425 	dout("open fmode %d wants %s\n", fmode, ceph_cap_string(wanted));
426 	req = prepare_open_request(inode->i_sb, flags, 0);
427 	if (IS_ERR(req)) {
428 		err = PTR_ERR(req);
429 		goto out;
430 	}
431 	req->r_inode = inode;
432 	ihold(inode);
433 
434 	req->r_num_caps = 1;
435 	err = ceph_mdsc_do_request(mdsc, NULL, req);
436 	if (!err)
437 		err = ceph_init_file(inode, file, req->r_fmode);
438 	ceph_mdsc_put_request(req);
439 	dout("open result=%d on %llx.%llx\n", err, ceph_vinop(inode));
440 out:
441 	return err;
442 }
443 
444 /* Clone the layout from a synchronous create, if the dir now has Dc caps */
445 static void
cache_file_layout(struct inode * dst,struct inode * src)446 cache_file_layout(struct inode *dst, struct inode *src)
447 {
448 	struct ceph_inode_info *cdst = ceph_inode(dst);
449 	struct ceph_inode_info *csrc = ceph_inode(src);
450 
451 	spin_lock(&cdst->i_ceph_lock);
452 	if ((__ceph_caps_issued(cdst, NULL) & CEPH_CAP_DIR_CREATE) &&
453 	    !ceph_file_layout_is_valid(&cdst->i_cached_layout)) {
454 		memcpy(&cdst->i_cached_layout, &csrc->i_layout,
455 			sizeof(cdst->i_cached_layout));
456 		rcu_assign_pointer(cdst->i_cached_layout.pool_ns,
457 				   ceph_try_get_string(csrc->i_layout.pool_ns));
458 	}
459 	spin_unlock(&cdst->i_ceph_lock);
460 }
461 
462 /*
463  * Try to set up an async create. We need caps, a file layout, and inode number,
464  * and either a lease on the dentry or complete dir info. If any of those
465  * criteria are not satisfied, then return false and the caller can go
466  * synchronous.
467  */
try_prep_async_create(struct inode * dir,struct dentry * dentry,struct ceph_file_layout * lo,u64 * pino)468 static int try_prep_async_create(struct inode *dir, struct dentry *dentry,
469 				 struct ceph_file_layout *lo, u64 *pino)
470 {
471 	struct ceph_inode_info *ci = ceph_inode(dir);
472 	struct ceph_dentry_info *di = ceph_dentry(dentry);
473 	int got = 0, want = CEPH_CAP_FILE_EXCL | CEPH_CAP_DIR_CREATE;
474 	u64 ino;
475 
476 	spin_lock(&ci->i_ceph_lock);
477 	/* No auth cap means no chance for Dc caps */
478 	if (!ci->i_auth_cap)
479 		goto no_async;
480 
481 	/* Any delegated inos? */
482 	if (xa_empty(&ci->i_auth_cap->session->s_delegated_inos))
483 		goto no_async;
484 
485 	if (!ceph_file_layout_is_valid(&ci->i_cached_layout))
486 		goto no_async;
487 
488 	if ((__ceph_caps_issued(ci, NULL) & want) != want)
489 		goto no_async;
490 
491 	if (d_in_lookup(dentry)) {
492 		if (!__ceph_dir_is_complete(ci))
493 			goto no_async;
494 		spin_lock(&dentry->d_lock);
495 		di->lease_shared_gen = atomic_read(&ci->i_shared_gen);
496 		spin_unlock(&dentry->d_lock);
497 	} else if (atomic_read(&ci->i_shared_gen) !=
498 		   READ_ONCE(di->lease_shared_gen)) {
499 		goto no_async;
500 	}
501 
502 	ino = ceph_get_deleg_ino(ci->i_auth_cap->session);
503 	if (!ino)
504 		goto no_async;
505 
506 	*pino = ino;
507 	ceph_take_cap_refs(ci, want, false);
508 	memcpy(lo, &ci->i_cached_layout, sizeof(*lo));
509 	rcu_assign_pointer(lo->pool_ns,
510 			   ceph_try_get_string(ci->i_cached_layout.pool_ns));
511 	got = want;
512 no_async:
513 	spin_unlock(&ci->i_ceph_lock);
514 	return got;
515 }
516 
restore_deleg_ino(struct inode * dir,u64 ino)517 static void restore_deleg_ino(struct inode *dir, u64 ino)
518 {
519 	struct ceph_inode_info *ci = ceph_inode(dir);
520 	struct ceph_mds_session *s = NULL;
521 
522 	spin_lock(&ci->i_ceph_lock);
523 	if (ci->i_auth_cap)
524 		s = ceph_get_mds_session(ci->i_auth_cap->session);
525 	spin_unlock(&ci->i_ceph_lock);
526 	if (s) {
527 		int err = ceph_restore_deleg_ino(s, ino);
528 		if (err)
529 			pr_warn("ceph: unable to restore delegated ino 0x%llx to session: %d\n",
530 				ino, err);
531 		ceph_put_mds_session(s);
532 	}
533 }
534 
wake_async_create_waiters(struct inode * inode,struct ceph_mds_session * session)535 static void wake_async_create_waiters(struct inode *inode,
536 				      struct ceph_mds_session *session)
537 {
538 	struct ceph_inode_info *ci = ceph_inode(inode);
539 
540 	spin_lock(&ci->i_ceph_lock);
541 	if (ci->i_ceph_flags & CEPH_I_ASYNC_CREATE) {
542 		ci->i_ceph_flags &= ~CEPH_I_ASYNC_CREATE;
543 		wake_up_bit(&ci->i_ceph_flags, CEPH_ASYNC_CREATE_BIT);
544 	}
545 	ceph_kick_flushing_inode_caps(session, ci);
546 	spin_unlock(&ci->i_ceph_lock);
547 }
548 
ceph_async_create_cb(struct ceph_mds_client * mdsc,struct ceph_mds_request * req)549 static void ceph_async_create_cb(struct ceph_mds_client *mdsc,
550                                  struct ceph_mds_request *req)
551 {
552 	struct dentry *dentry = req->r_dentry;
553 	struct inode *dinode = d_inode(dentry);
554 	struct inode *tinode = req->r_target_inode;
555 	int result = req->r_err ? req->r_err :
556 			le32_to_cpu(req->r_reply_info.head->result);
557 
558 	WARN_ON_ONCE(dinode && tinode && dinode != tinode);
559 
560 	/* MDS changed -- caller must resubmit */
561 	if (result == -EJUKEBOX)
562 		goto out;
563 
564 	mapping_set_error(req->r_parent->i_mapping, result);
565 
566 	if (result) {
567 		int pathlen = 0;
568 		u64 base = 0;
569 		char *path = ceph_mdsc_build_path(req->r_dentry, &pathlen,
570 						  &base, 0);
571 
572 		pr_warn("ceph: async create failure path=(%llx)%s result=%d!\n",
573 			base, IS_ERR(path) ? "<<bad>>" : path, result);
574 		ceph_mdsc_free_path(path, pathlen);
575 
576 		ceph_dir_clear_complete(req->r_parent);
577 		if (!d_unhashed(dentry))
578 			d_drop(dentry);
579 
580 		if (dinode) {
581 			mapping_set_error(dinode->i_mapping, result);
582 			ceph_inode_shutdown(dinode);
583 			wake_async_create_waiters(dinode, req->r_session);
584 		}
585 	}
586 
587 	if (tinode) {
588 		u64 ino = ceph_vino(tinode).ino;
589 
590 		if (req->r_deleg_ino != ino)
591 			pr_warn("%s: inode number mismatch! err=%d deleg_ino=0x%llx target=0x%llx\n",
592 				__func__, req->r_err, req->r_deleg_ino, ino);
593 
594 		mapping_set_error(tinode->i_mapping, result);
595 		wake_async_create_waiters(tinode, req->r_session);
596 	} else if (!result) {
597 		pr_warn("%s: no req->r_target_inode for 0x%llx\n", __func__,
598 			req->r_deleg_ino);
599 	}
600 out:
601 	ceph_mdsc_release_dir_caps(req);
602 }
603 
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)604 static int ceph_finish_async_create(struct inode *dir, struct dentry *dentry,
605 				    struct file *file, umode_t mode,
606 				    struct ceph_mds_request *req,
607 				    struct ceph_acl_sec_ctx *as_ctx,
608 				    struct ceph_file_layout *lo)
609 {
610 	int ret;
611 	char xattr_buf[4];
612 	struct ceph_mds_reply_inode in = { };
613 	struct ceph_mds_reply_info_in iinfo = { .in = &in };
614 	struct ceph_inode_info *ci = ceph_inode(dir);
615 	struct inode *inode;
616 	struct timespec64 now;
617 	struct ceph_string *pool_ns;
618 	struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb);
619 	struct ceph_vino vino = { .ino = req->r_deleg_ino,
620 				  .snap = CEPH_NOSNAP };
621 
622 	ktime_get_real_ts64(&now);
623 
624 	inode = ceph_get_inode(dentry->d_sb, vino);
625 	if (IS_ERR(inode))
626 		return PTR_ERR(inode);
627 
628 	iinfo.inline_version = CEPH_INLINE_NONE;
629 	iinfo.change_attr = 1;
630 	ceph_encode_timespec64(&iinfo.btime, &now);
631 
632 	if (req->r_pagelist) {
633 		iinfo.xattr_len = req->r_pagelist->length;
634 		iinfo.xattr_data = req->r_pagelist->mapped_tail;
635 	} else {
636 		/* fake it */
637 		iinfo.xattr_len = ARRAY_SIZE(xattr_buf);
638 		iinfo.xattr_data = xattr_buf;
639 		memset(iinfo.xattr_data, 0, iinfo.xattr_len);
640 	}
641 
642 	in.ino = cpu_to_le64(vino.ino);
643 	in.snapid = cpu_to_le64(CEPH_NOSNAP);
644 	in.version = cpu_to_le64(1);	// ???
645 	in.cap.caps = in.cap.wanted = cpu_to_le32(CEPH_CAP_ALL_FILE);
646 	in.cap.cap_id = cpu_to_le64(1);
647 	in.cap.realm = cpu_to_le64(ci->i_snap_realm->ino);
648 	in.cap.flags = CEPH_CAP_FLAG_AUTH;
649 	in.ctime = in.mtime = in.atime = iinfo.btime;
650 	in.truncate_seq = cpu_to_le32(1);
651 	in.truncate_size = cpu_to_le64(-1ULL);
652 	in.xattr_version = cpu_to_le64(1);
653 	in.uid = cpu_to_le32(from_kuid(&init_user_ns, current_fsuid()));
654 	if (dir->i_mode & S_ISGID) {
655 		in.gid = cpu_to_le32(from_kgid(&init_user_ns, dir->i_gid));
656 
657 		/* Directories always inherit the setgid bit. */
658 		if (S_ISDIR(mode))
659 			mode |= S_ISGID;
660 		else if ((mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP) &&
661 			 !in_group_p(dir->i_gid) &&
662 			 !capable_wrt_inode_uidgid(&init_user_ns, dir, CAP_FSETID))
663 			mode &= ~S_ISGID;
664 	} else {
665 		in.gid = cpu_to_le32(from_kgid(&init_user_ns, current_fsgid()));
666 	}
667 	in.mode = cpu_to_le32((u32)mode);
668 
669 	in.nlink = cpu_to_le32(1);
670 	in.max_size = cpu_to_le64(lo->stripe_unit);
671 
672 	ceph_file_layout_to_legacy(lo, &in.layout);
673 	/* lo is private, so pool_ns can't change */
674 	pool_ns = rcu_dereference_raw(lo->pool_ns);
675 	if (pool_ns) {
676 		iinfo.pool_ns_len = pool_ns->len;
677 		iinfo.pool_ns_data = pool_ns->str;
678 	}
679 
680 	down_read(&mdsc->snap_rwsem);
681 	ret = ceph_fill_inode(inode, NULL, &iinfo, NULL, req->r_session,
682 			      req->r_fmode, NULL);
683 	up_read(&mdsc->snap_rwsem);
684 	if (ret) {
685 		dout("%s failed to fill inode: %d\n", __func__, ret);
686 		ceph_dir_clear_complete(dir);
687 		if (!d_unhashed(dentry))
688 			d_drop(dentry);
689 		if (inode->i_state & I_NEW)
690 			discard_new_inode(inode);
691 	} else {
692 		struct dentry *dn;
693 
694 		dout("%s d_adding new inode 0x%llx to 0x%llx/%s\n", __func__,
695 			vino.ino, ceph_ino(dir), dentry->d_name.name);
696 		ceph_dir_clear_ordered(dir);
697 		ceph_init_inode_acls(inode, as_ctx);
698 		if (inode->i_state & I_NEW) {
699 			/*
700 			 * If it's not I_NEW, then someone created this before
701 			 * we got here. Assume the server is aware of it at
702 			 * that point and don't worry about setting
703 			 * CEPH_I_ASYNC_CREATE.
704 			 */
705 			ceph_inode(inode)->i_ceph_flags = CEPH_I_ASYNC_CREATE;
706 			unlock_new_inode(inode);
707 		}
708 		if (d_in_lookup(dentry) || d_really_is_negative(dentry)) {
709 			if (!d_unhashed(dentry))
710 				d_drop(dentry);
711 			dn = d_splice_alias(inode, dentry);
712 			WARN_ON_ONCE(dn && dn != dentry);
713 		}
714 		file->f_mode |= FMODE_CREATED;
715 		ret = finish_open(file, dentry, ceph_open);
716 	}
717 	return ret;
718 }
719 
720 /*
721  * Do a lookup + open with a single request.  If we get a non-existent
722  * file or symlink, return 1 so the VFS can retry.
723  */
ceph_atomic_open(struct inode * dir,struct dentry * dentry,struct file * file,unsigned flags,umode_t mode)724 int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
725 		     struct file *file, unsigned flags, umode_t mode)
726 {
727 	struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb);
728 	struct ceph_mds_client *mdsc = fsc->mdsc;
729 	struct ceph_mds_request *req;
730 	struct dentry *dn;
731 	struct ceph_acl_sec_ctx as_ctx = {};
732 	bool try_async = ceph_test_mount_opt(fsc, ASYNC_DIROPS);
733 	int mask;
734 	int err;
735 
736 	dout("atomic_open %p dentry %p '%pd' %s flags %d mode 0%o\n",
737 	     dir, dentry, dentry,
738 	     d_unhashed(dentry) ? "unhashed" : "hashed", flags, mode);
739 
740 	if (dentry->d_name.len > NAME_MAX)
741 		return -ENAMETOOLONG;
742 
743 	if (flags & O_CREAT) {
744 		if (ceph_quota_is_max_files_exceeded(dir))
745 			return -EDQUOT;
746 		err = ceph_pre_init_acls(dir, &mode, &as_ctx);
747 		if (err < 0)
748 			return err;
749 		err = ceph_security_init_secctx(dentry, mode, &as_ctx);
750 		if (err < 0)
751 			goto out_ctx;
752 		/* Async create can't handle more than a page of xattrs */
753 		if (as_ctx.pagelist &&
754 		    !list_is_singular(&as_ctx.pagelist->head))
755 			try_async = false;
756 	} else if (!d_in_lookup(dentry)) {
757 		/* If it's not being looked up, it's negative */
758 		return -ENOENT;
759 	}
760 retry:
761 	/* do the open */
762 	req = prepare_open_request(dir->i_sb, flags, mode);
763 	if (IS_ERR(req)) {
764 		err = PTR_ERR(req);
765 		goto out_ctx;
766 	}
767 	req->r_dentry = dget(dentry);
768 	req->r_num_caps = 2;
769 	mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED;
770 	if (ceph_security_xattr_wanted(dir))
771 		mask |= CEPH_CAP_XATTR_SHARED;
772 	req->r_args.open.mask = cpu_to_le32(mask);
773 	req->r_parent = dir;
774 	ihold(dir);
775 
776 	if (flags & O_CREAT) {
777 		struct ceph_file_layout lo;
778 
779 		req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL;
780 		req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
781 		if (as_ctx.pagelist) {
782 			req->r_pagelist = as_ctx.pagelist;
783 			as_ctx.pagelist = NULL;
784 		}
785 		if (try_async &&
786 		    (req->r_dir_caps =
787 		      try_prep_async_create(dir, dentry, &lo,
788 					    &req->r_deleg_ino))) {
789 			set_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags);
790 			req->r_args.open.flags |= cpu_to_le32(CEPH_O_EXCL);
791 			req->r_callback = ceph_async_create_cb;
792 			err = ceph_mdsc_submit_request(mdsc, dir, req);
793 			if (!err) {
794 				err = ceph_finish_async_create(dir, dentry,
795 							file, mode, req,
796 							&as_ctx, &lo);
797 			} else if (err == -EJUKEBOX) {
798 				restore_deleg_ino(dir, req->r_deleg_ino);
799 				ceph_mdsc_put_request(req);
800 				try_async = false;
801 				ceph_put_string(rcu_dereference_raw(lo.pool_ns));
802 				goto retry;
803 			}
804 			ceph_put_string(rcu_dereference_raw(lo.pool_ns));
805 			goto out_req;
806 		}
807 	}
808 
809 	set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags);
810 	err = ceph_mdsc_do_request(mdsc,
811 				   (flags & (O_CREAT|O_TRUNC)) ? dir : NULL,
812 				   req);
813 	if (err == -ENOENT) {
814 		dentry = ceph_handle_snapdir(req, dentry);
815 		if (IS_ERR(dentry)) {
816 			err = PTR_ERR(dentry);
817 			goto out_req;
818 		}
819 		err = 0;
820 	}
821 
822 	if (!err && (flags & O_CREAT) && !req->r_reply_info.head->is_dentry)
823 		err = ceph_handle_notrace_create(dir, dentry);
824 
825 	if (d_in_lookup(dentry)) {
826 		dn = ceph_finish_lookup(req, dentry, err);
827 		if (IS_ERR(dn))
828 			err = PTR_ERR(dn);
829 	} else {
830 		/* we were given a hashed negative dentry */
831 		dn = NULL;
832 	}
833 	if (err)
834 		goto out_req;
835 	if (dn || d_really_is_negative(dentry) || d_is_symlink(dentry)) {
836 		/* make vfs retry on splice, ENOENT, or symlink */
837 		dout("atomic_open finish_no_open on dn %p\n", dn);
838 		err = finish_no_open(file, dn);
839 	} else {
840 		dout("atomic_open finish_open on dn %p\n", dn);
841 		if (req->r_op == CEPH_MDS_OP_CREATE && req->r_reply_info.has_create_ino) {
842 			struct inode *newino = d_inode(dentry);
843 
844 			cache_file_layout(dir, newino);
845 			ceph_init_inode_acls(newino, &as_ctx);
846 			file->f_mode |= FMODE_CREATED;
847 		}
848 		err = finish_open(file, dentry, ceph_open);
849 	}
850 out_req:
851 	ceph_mdsc_put_request(req);
852 out_ctx:
853 	ceph_release_acl_sec_ctx(&as_ctx);
854 	dout("atomic_open result=%d\n", err);
855 	return err;
856 }
857 
ceph_release(struct inode * inode,struct file * file)858 int ceph_release(struct inode *inode, struct file *file)
859 {
860 	struct ceph_inode_info *ci = ceph_inode(inode);
861 
862 	if (S_ISDIR(inode->i_mode)) {
863 		struct ceph_dir_file_info *dfi = file->private_data;
864 		dout("release inode %p dir file %p\n", inode, file);
865 		WARN_ON(!list_empty(&dfi->file_info.rw_contexts));
866 
867 		ceph_put_fmode(ci, dfi->file_info.fmode, 1);
868 
869 		if (dfi->last_readdir)
870 			ceph_mdsc_put_request(dfi->last_readdir);
871 		kfree(dfi->last_name);
872 		kfree(dfi->dir_info);
873 		kmem_cache_free(ceph_dir_file_cachep, dfi);
874 	} else {
875 		struct ceph_file_info *fi = file->private_data;
876 		dout("release inode %p regular file %p\n", inode, file);
877 		WARN_ON(!list_empty(&fi->rw_contexts));
878 
879 		ceph_fscache_unuse_cookie(inode, file->f_mode & FMODE_WRITE);
880 		ceph_put_fmode(ci, fi->fmode, 1);
881 
882 		kmem_cache_free(ceph_file_cachep, fi);
883 	}
884 
885 	/* wake up anyone waiting for caps on this inode */
886 	wake_up_all(&ci->i_cap_wq);
887 	return 0;
888 }
889 
890 enum {
891 	HAVE_RETRIED = 1,
892 	CHECK_EOF =    2,
893 	READ_INLINE =  3,
894 };
895 
896 /*
897  * Completely synchronous read and write methods.  Direct from __user
898  * buffer to osd, or directly to user pages (if O_DIRECT).
899  *
900  * If the read spans object boundary, just do multiple reads.  (That's not
901  * atomic, but good enough for now.)
902  *
903  * If we get a short result from the OSD, check against i_size; we need to
904  * only return a short read to the caller if we hit EOF.
905  */
ceph_sync_read(struct kiocb * iocb,struct iov_iter * to,int * retry_op)906 static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *to,
907 			      int *retry_op)
908 {
909 	struct file *file = iocb->ki_filp;
910 	struct inode *inode = file_inode(file);
911 	struct ceph_inode_info *ci = ceph_inode(inode);
912 	struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
913 	struct ceph_osd_client *osdc = &fsc->client->osdc;
914 	ssize_t ret;
915 	u64 off = iocb->ki_pos;
916 	u64 len = iov_iter_count(to);
917 	u64 i_size = i_size_read(inode);
918 
919 	dout("sync_read on file %p %llu~%u %s\n", file, off, (unsigned)len,
920 	     (file->f_flags & O_DIRECT) ? "O_DIRECT" : "");
921 
922 	if (!len)
923 		return 0;
924 	/*
925 	 * flush any page cache pages in this range.  this
926 	 * will make concurrent normal and sync io slow,
927 	 * but it will at least behave sensibly when they are
928 	 * in sequence.
929 	 */
930 	ret = filemap_write_and_wait_range(inode->i_mapping,
931 					   off, off + len - 1);
932 	if (ret < 0)
933 		return ret;
934 
935 	ret = 0;
936 	while ((len = iov_iter_count(to)) > 0) {
937 		struct ceph_osd_request *req;
938 		struct page **pages;
939 		int num_pages;
940 		size_t page_off;
941 		bool more;
942 		int idx;
943 		size_t left;
944 
945 		req = ceph_osdc_new_request(osdc, &ci->i_layout,
946 					ci->i_vino, off, &len, 0, 1,
947 					CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ,
948 					NULL, ci->i_truncate_seq,
949 					ci->i_truncate_size, false);
950 		if (IS_ERR(req)) {
951 			ret = PTR_ERR(req);
952 			break;
953 		}
954 
955 		more = len < iov_iter_count(to);
956 
957 		num_pages = calc_pages_for(off, len);
958 		page_off = off & ~PAGE_MASK;
959 		pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL);
960 		if (IS_ERR(pages)) {
961 			ceph_osdc_put_request(req);
962 			ret = PTR_ERR(pages);
963 			break;
964 		}
965 
966 		osd_req_op_extent_osd_data_pages(req, 0, pages, len, page_off,
967 						 false, false);
968 		ret = ceph_osdc_start_request(osdc, req, false);
969 		if (!ret)
970 			ret = ceph_osdc_wait_request(osdc, req);
971 
972 		ceph_update_read_metrics(&fsc->mdsc->metric,
973 					 req->r_start_latency,
974 					 req->r_end_latency,
975 					 len, ret);
976 
977 		ceph_osdc_put_request(req);
978 
979 		i_size = i_size_read(inode);
980 		dout("sync_read %llu~%llu got %zd i_size %llu%s\n",
981 		     off, len, ret, i_size, (more ? " MORE" : ""));
982 
983 		if (ret == -ENOENT)
984 			ret = 0;
985 		if (ret >= 0 && ret < len && (off + ret < i_size)) {
986 			int zlen = min(len - ret, i_size - off - ret);
987 			int zoff = page_off + ret;
988 			dout("sync_read zero gap %llu~%llu\n",
989                              off + ret, off + ret + zlen);
990 			ceph_zero_page_vector_range(zoff, zlen, pages);
991 			ret += zlen;
992 		}
993 
994 		idx = 0;
995 		left = ret > 0 ? ret : 0;
996 		while (left > 0) {
997 			size_t len, copied;
998 			page_off = off & ~PAGE_MASK;
999 			len = min_t(size_t, left, PAGE_SIZE - page_off);
1000 			SetPageUptodate(pages[idx]);
1001 			copied = copy_page_to_iter(pages[idx++],
1002 						   page_off, len, to);
1003 			off += copied;
1004 			left -= copied;
1005 			if (copied < len) {
1006 				ret = -EFAULT;
1007 				break;
1008 			}
1009 		}
1010 		ceph_release_page_vector(pages, num_pages);
1011 
1012 		if (ret < 0) {
1013 			if (ret == -EBLOCKLISTED)
1014 				fsc->blocklisted = true;
1015 			break;
1016 		}
1017 
1018 		if (off >= i_size || !more)
1019 			break;
1020 	}
1021 
1022 	if (off > iocb->ki_pos) {
1023 		if (off >= i_size) {
1024 			*retry_op = CHECK_EOF;
1025 			ret = i_size - iocb->ki_pos;
1026 			iocb->ki_pos = i_size;
1027 		} else {
1028 			ret = off - iocb->ki_pos;
1029 			iocb->ki_pos = off;
1030 		}
1031 	}
1032 
1033 	dout("sync_read result %zd retry_op %d\n", ret, *retry_op);
1034 	return ret;
1035 }
1036 
1037 struct ceph_aio_request {
1038 	struct kiocb *iocb;
1039 	size_t total_len;
1040 	bool write;
1041 	bool should_dirty;
1042 	int error;
1043 	struct list_head osd_reqs;
1044 	unsigned num_reqs;
1045 	atomic_t pending_reqs;
1046 	struct timespec64 mtime;
1047 	struct ceph_cap_flush *prealloc_cf;
1048 };
1049 
1050 struct ceph_aio_work {
1051 	struct work_struct work;
1052 	struct ceph_osd_request *req;
1053 };
1054 
1055 static void ceph_aio_retry_work(struct work_struct *work);
1056 
ceph_aio_complete(struct inode * inode,struct ceph_aio_request * aio_req)1057 static void ceph_aio_complete(struct inode *inode,
1058 			      struct ceph_aio_request *aio_req)
1059 {
1060 	struct ceph_inode_info *ci = ceph_inode(inode);
1061 	int ret;
1062 
1063 	if (!atomic_dec_and_test(&aio_req->pending_reqs))
1064 		return;
1065 
1066 	if (aio_req->iocb->ki_flags & IOCB_DIRECT)
1067 		inode_dio_end(inode);
1068 
1069 	ret = aio_req->error;
1070 	if (!ret)
1071 		ret = aio_req->total_len;
1072 
1073 	dout("ceph_aio_complete %p rc %d\n", inode, ret);
1074 
1075 	if (ret >= 0 && aio_req->write) {
1076 		int dirty;
1077 
1078 		loff_t endoff = aio_req->iocb->ki_pos + aio_req->total_len;
1079 		if (endoff > i_size_read(inode)) {
1080 			if (ceph_inode_set_size(inode, endoff))
1081 				ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
1082 		}
1083 
1084 		spin_lock(&ci->i_ceph_lock);
1085 		dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
1086 					       &aio_req->prealloc_cf);
1087 		spin_unlock(&ci->i_ceph_lock);
1088 		if (dirty)
1089 			__mark_inode_dirty(inode, dirty);
1090 
1091 	}
1092 
1093 	ceph_put_cap_refs(ci, (aio_req->write ? CEPH_CAP_FILE_WR :
1094 						CEPH_CAP_FILE_RD));
1095 
1096 	aio_req->iocb->ki_complete(aio_req->iocb, ret);
1097 
1098 	ceph_free_cap_flush(aio_req->prealloc_cf);
1099 	kfree(aio_req);
1100 }
1101 
ceph_aio_complete_req(struct ceph_osd_request * req)1102 static void ceph_aio_complete_req(struct ceph_osd_request *req)
1103 {
1104 	int rc = req->r_result;
1105 	struct inode *inode = req->r_inode;
1106 	struct ceph_aio_request *aio_req = req->r_priv;
1107 	struct ceph_osd_data *osd_data = osd_req_op_extent_osd_data(req, 0);
1108 	struct ceph_client_metric *metric = &ceph_sb_to_mdsc(inode->i_sb)->metric;
1109 	unsigned int len = osd_data->bvec_pos.iter.bi_size;
1110 
1111 	BUG_ON(osd_data->type != CEPH_OSD_DATA_TYPE_BVECS);
1112 	BUG_ON(!osd_data->num_bvecs);
1113 
1114 	dout("ceph_aio_complete_req %p rc %d bytes %u\n", inode, rc, len);
1115 
1116 	if (rc == -EOLDSNAPC) {
1117 		struct ceph_aio_work *aio_work;
1118 		BUG_ON(!aio_req->write);
1119 
1120 		aio_work = kmalloc(sizeof(*aio_work), GFP_NOFS);
1121 		if (aio_work) {
1122 			INIT_WORK(&aio_work->work, ceph_aio_retry_work);
1123 			aio_work->req = req;
1124 			queue_work(ceph_inode_to_client(inode)->inode_wq,
1125 				   &aio_work->work);
1126 			return;
1127 		}
1128 		rc = -ENOMEM;
1129 	} else if (!aio_req->write) {
1130 		if (rc == -ENOENT)
1131 			rc = 0;
1132 		if (rc >= 0 && len > rc) {
1133 			struct iov_iter i;
1134 			int zlen = len - rc;
1135 
1136 			/*
1137 			 * If read is satisfied by single OSD request,
1138 			 * it can pass EOF. Otherwise read is within
1139 			 * i_size.
1140 			 */
1141 			if (aio_req->num_reqs == 1) {
1142 				loff_t i_size = i_size_read(inode);
1143 				loff_t endoff = aio_req->iocb->ki_pos + rc;
1144 				if (endoff < i_size)
1145 					zlen = min_t(size_t, zlen,
1146 						     i_size - endoff);
1147 				aio_req->total_len = rc + zlen;
1148 			}
1149 
1150 			iov_iter_bvec(&i, READ, osd_data->bvec_pos.bvecs,
1151 				      osd_data->num_bvecs, len);
1152 			iov_iter_advance(&i, rc);
1153 			iov_iter_zero(zlen, &i);
1154 		}
1155 	}
1156 
1157 	/* r_start_latency == 0 means the request was not submitted */
1158 	if (req->r_start_latency) {
1159 		if (aio_req->write)
1160 			ceph_update_write_metrics(metric, req->r_start_latency,
1161 						  req->r_end_latency, len, rc);
1162 		else
1163 			ceph_update_read_metrics(metric, req->r_start_latency,
1164 						 req->r_end_latency, len, rc);
1165 	}
1166 
1167 	put_bvecs(osd_data->bvec_pos.bvecs, osd_data->num_bvecs,
1168 		  aio_req->should_dirty);
1169 	ceph_osdc_put_request(req);
1170 
1171 	if (rc < 0)
1172 		cmpxchg(&aio_req->error, 0, rc);
1173 
1174 	ceph_aio_complete(inode, aio_req);
1175 	return;
1176 }
1177 
ceph_aio_retry_work(struct work_struct * work)1178 static void ceph_aio_retry_work(struct work_struct *work)
1179 {
1180 	struct ceph_aio_work *aio_work =
1181 		container_of(work, struct ceph_aio_work, work);
1182 	struct ceph_osd_request *orig_req = aio_work->req;
1183 	struct ceph_aio_request *aio_req = orig_req->r_priv;
1184 	struct inode *inode = orig_req->r_inode;
1185 	struct ceph_inode_info *ci = ceph_inode(inode);
1186 	struct ceph_snap_context *snapc;
1187 	struct ceph_osd_request *req;
1188 	int ret;
1189 
1190 	spin_lock(&ci->i_ceph_lock);
1191 	if (__ceph_have_pending_cap_snap(ci)) {
1192 		struct ceph_cap_snap *capsnap =
1193 			list_last_entry(&ci->i_cap_snaps,
1194 					struct ceph_cap_snap,
1195 					ci_item);
1196 		snapc = ceph_get_snap_context(capsnap->context);
1197 	} else {
1198 		BUG_ON(!ci->i_head_snapc);
1199 		snapc = ceph_get_snap_context(ci->i_head_snapc);
1200 	}
1201 	spin_unlock(&ci->i_ceph_lock);
1202 
1203 	req = ceph_osdc_alloc_request(orig_req->r_osdc, snapc, 1,
1204 			false, GFP_NOFS);
1205 	if (!req) {
1206 		ret = -ENOMEM;
1207 		req = orig_req;
1208 		goto out;
1209 	}
1210 
1211 	req->r_flags = /* CEPH_OSD_FLAG_ORDERSNAP | */ CEPH_OSD_FLAG_WRITE;
1212 	ceph_oloc_copy(&req->r_base_oloc, &orig_req->r_base_oloc);
1213 	ceph_oid_copy(&req->r_base_oid, &orig_req->r_base_oid);
1214 
1215 	req->r_ops[0] = orig_req->r_ops[0];
1216 
1217 	req->r_mtime = aio_req->mtime;
1218 	req->r_data_offset = req->r_ops[0].extent.offset;
1219 
1220 	ret = ceph_osdc_alloc_messages(req, GFP_NOFS);
1221 	if (ret) {
1222 		ceph_osdc_put_request(req);
1223 		req = orig_req;
1224 		goto out;
1225 	}
1226 
1227 	ceph_osdc_put_request(orig_req);
1228 
1229 	req->r_callback = ceph_aio_complete_req;
1230 	req->r_inode = inode;
1231 	req->r_priv = aio_req;
1232 
1233 	ret = ceph_osdc_start_request(req->r_osdc, req, false);
1234 out:
1235 	if (ret < 0) {
1236 		req->r_result = ret;
1237 		ceph_aio_complete_req(req);
1238 	}
1239 
1240 	ceph_put_snap_context(snapc);
1241 	kfree(aio_work);
1242 }
1243 
1244 static ssize_t
ceph_direct_read_write(struct kiocb * iocb,struct iov_iter * iter,struct ceph_snap_context * snapc,struct ceph_cap_flush ** pcf)1245 ceph_direct_read_write(struct kiocb *iocb, struct iov_iter *iter,
1246 		       struct ceph_snap_context *snapc,
1247 		       struct ceph_cap_flush **pcf)
1248 {
1249 	struct file *file = iocb->ki_filp;
1250 	struct inode *inode = file_inode(file);
1251 	struct ceph_inode_info *ci = ceph_inode(inode);
1252 	struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1253 	struct ceph_client_metric *metric = &fsc->mdsc->metric;
1254 	struct ceph_vino vino;
1255 	struct ceph_osd_request *req;
1256 	struct bio_vec *bvecs;
1257 	struct ceph_aio_request *aio_req = NULL;
1258 	int num_pages = 0;
1259 	int flags;
1260 	int ret = 0;
1261 	struct timespec64 mtime = current_time(inode);
1262 	size_t count = iov_iter_count(iter);
1263 	loff_t pos = iocb->ki_pos;
1264 	bool write = iov_iter_rw(iter) == WRITE;
1265 	bool should_dirty = !write && iter_is_iovec(iter);
1266 
1267 	if (write && ceph_snap(file_inode(file)) != CEPH_NOSNAP)
1268 		return -EROFS;
1269 
1270 	dout("sync_direct_%s on file %p %lld~%u snapc %p seq %lld\n",
1271 	     (write ? "write" : "read"), file, pos, (unsigned)count,
1272 	     snapc, snapc ? snapc->seq : 0);
1273 
1274 	if (write) {
1275 		int ret2;
1276 
1277 		ceph_fscache_invalidate(inode, true);
1278 
1279 		ret2 = invalidate_inode_pages2_range(inode->i_mapping,
1280 					pos >> PAGE_SHIFT,
1281 					(pos + count - 1) >> PAGE_SHIFT);
1282 		if (ret2 < 0)
1283 			dout("invalidate_inode_pages2_range returned %d\n", ret2);
1284 
1285 		flags = /* CEPH_OSD_FLAG_ORDERSNAP | */ CEPH_OSD_FLAG_WRITE;
1286 	} else {
1287 		flags = CEPH_OSD_FLAG_READ;
1288 	}
1289 
1290 	while (iov_iter_count(iter) > 0) {
1291 		u64 size = iov_iter_count(iter);
1292 		ssize_t len;
1293 
1294 		if (write)
1295 			size = min_t(u64, size, fsc->mount_options->wsize);
1296 		else
1297 			size = min_t(u64, size, fsc->mount_options->rsize);
1298 
1299 		vino = ceph_vino(inode);
1300 		req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1301 					    vino, pos, &size, 0,
1302 					    1,
1303 					    write ? CEPH_OSD_OP_WRITE :
1304 						    CEPH_OSD_OP_READ,
1305 					    flags, snapc,
1306 					    ci->i_truncate_seq,
1307 					    ci->i_truncate_size,
1308 					    false);
1309 		if (IS_ERR(req)) {
1310 			ret = PTR_ERR(req);
1311 			break;
1312 		}
1313 
1314 		len = iter_get_bvecs_alloc(iter, size, &bvecs, &num_pages);
1315 		if (len < 0) {
1316 			ceph_osdc_put_request(req);
1317 			ret = len;
1318 			break;
1319 		}
1320 		if (len != size)
1321 			osd_req_op_extent_update(req, 0, len);
1322 
1323 		/*
1324 		 * To simplify error handling, allow AIO when IO within i_size
1325 		 * or IO can be satisfied by single OSD request.
1326 		 */
1327 		if (pos == iocb->ki_pos && !is_sync_kiocb(iocb) &&
1328 		    (len == count || pos + count <= i_size_read(inode))) {
1329 			aio_req = kzalloc(sizeof(*aio_req), GFP_KERNEL);
1330 			if (aio_req) {
1331 				aio_req->iocb = iocb;
1332 				aio_req->write = write;
1333 				aio_req->should_dirty = should_dirty;
1334 				INIT_LIST_HEAD(&aio_req->osd_reqs);
1335 				if (write) {
1336 					aio_req->mtime = mtime;
1337 					swap(aio_req->prealloc_cf, *pcf);
1338 				}
1339 			}
1340 			/* ignore error */
1341 		}
1342 
1343 		if (write) {
1344 			/*
1345 			 * throw out any page cache pages in this range. this
1346 			 * may block.
1347 			 */
1348 			truncate_inode_pages_range(inode->i_mapping, pos,
1349 						   PAGE_ALIGN(pos + len) - 1);
1350 
1351 			req->r_mtime = mtime;
1352 		}
1353 
1354 		osd_req_op_extent_osd_data_bvecs(req, 0, bvecs, num_pages, len);
1355 
1356 		if (aio_req) {
1357 			aio_req->total_len += len;
1358 			aio_req->num_reqs++;
1359 			atomic_inc(&aio_req->pending_reqs);
1360 
1361 			req->r_callback = ceph_aio_complete_req;
1362 			req->r_inode = inode;
1363 			req->r_priv = aio_req;
1364 			list_add_tail(&req->r_private_item, &aio_req->osd_reqs);
1365 
1366 			pos += len;
1367 			continue;
1368 		}
1369 
1370 		ret = ceph_osdc_start_request(req->r_osdc, req, false);
1371 		if (!ret)
1372 			ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
1373 
1374 		if (write)
1375 			ceph_update_write_metrics(metric, req->r_start_latency,
1376 						  req->r_end_latency, len, ret);
1377 		else
1378 			ceph_update_read_metrics(metric, req->r_start_latency,
1379 						 req->r_end_latency, len, ret);
1380 
1381 		size = i_size_read(inode);
1382 		if (!write) {
1383 			if (ret == -ENOENT)
1384 				ret = 0;
1385 			if (ret >= 0 && ret < len && pos + ret < size) {
1386 				struct iov_iter i;
1387 				int zlen = min_t(size_t, len - ret,
1388 						 size - pos - ret);
1389 
1390 				iov_iter_bvec(&i, READ, bvecs, num_pages, len);
1391 				iov_iter_advance(&i, ret);
1392 				iov_iter_zero(zlen, &i);
1393 				ret += zlen;
1394 			}
1395 			if (ret >= 0)
1396 				len = ret;
1397 		}
1398 
1399 		put_bvecs(bvecs, num_pages, should_dirty);
1400 		ceph_osdc_put_request(req);
1401 		if (ret < 0)
1402 			break;
1403 
1404 		pos += len;
1405 		if (!write && pos >= size)
1406 			break;
1407 
1408 		if (write && pos > size) {
1409 			if (ceph_inode_set_size(inode, pos))
1410 				ceph_check_caps(ceph_inode(inode),
1411 						CHECK_CAPS_AUTHONLY,
1412 						NULL);
1413 		}
1414 	}
1415 
1416 	if (aio_req) {
1417 		LIST_HEAD(osd_reqs);
1418 
1419 		if (aio_req->num_reqs == 0) {
1420 			kfree(aio_req);
1421 			return ret;
1422 		}
1423 
1424 		ceph_get_cap_refs(ci, write ? CEPH_CAP_FILE_WR :
1425 					      CEPH_CAP_FILE_RD);
1426 
1427 		list_splice(&aio_req->osd_reqs, &osd_reqs);
1428 		inode_dio_begin(inode);
1429 		while (!list_empty(&osd_reqs)) {
1430 			req = list_first_entry(&osd_reqs,
1431 					       struct ceph_osd_request,
1432 					       r_private_item);
1433 			list_del_init(&req->r_private_item);
1434 			if (ret >= 0)
1435 				ret = ceph_osdc_start_request(req->r_osdc,
1436 							      req, false);
1437 			if (ret < 0) {
1438 				req->r_result = ret;
1439 				ceph_aio_complete_req(req);
1440 			}
1441 		}
1442 		return -EIOCBQUEUED;
1443 	}
1444 
1445 	if (ret != -EOLDSNAPC && pos > iocb->ki_pos) {
1446 		ret = pos - iocb->ki_pos;
1447 		iocb->ki_pos = pos;
1448 	}
1449 	return ret;
1450 }
1451 
1452 /*
1453  * Synchronous write, straight from __user pointer or user pages.
1454  *
1455  * If write spans object boundary, just do multiple writes.  (For a
1456  * correct atomic write, we should e.g. take write locks on all
1457  * objects, rollback on failure, etc.)
1458  */
1459 static ssize_t
ceph_sync_write(struct kiocb * iocb,struct iov_iter * from,loff_t pos,struct ceph_snap_context * snapc)1460 ceph_sync_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos,
1461 		struct ceph_snap_context *snapc)
1462 {
1463 	struct file *file = iocb->ki_filp;
1464 	struct inode *inode = file_inode(file);
1465 	struct ceph_inode_info *ci = ceph_inode(inode);
1466 	struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1467 	struct ceph_vino vino;
1468 	struct ceph_osd_request *req;
1469 	struct page **pages;
1470 	u64 len;
1471 	int num_pages;
1472 	int written = 0;
1473 	int flags;
1474 	int ret;
1475 	bool check_caps = false;
1476 	struct timespec64 mtime = current_time(inode);
1477 	size_t count = iov_iter_count(from);
1478 
1479 	if (ceph_snap(file_inode(file)) != CEPH_NOSNAP)
1480 		return -EROFS;
1481 
1482 	dout("sync_write on file %p %lld~%u snapc %p seq %lld\n",
1483 	     file, pos, (unsigned)count, snapc, snapc->seq);
1484 
1485 	ret = filemap_write_and_wait_range(inode->i_mapping,
1486 					   pos, pos + count - 1);
1487 	if (ret < 0)
1488 		return ret;
1489 
1490 	ceph_fscache_invalidate(inode, false);
1491 	ret = invalidate_inode_pages2_range(inode->i_mapping,
1492 					    pos >> PAGE_SHIFT,
1493 					    (pos + count - 1) >> PAGE_SHIFT);
1494 	if (ret < 0)
1495 		dout("invalidate_inode_pages2_range returned %d\n", ret);
1496 
1497 	flags = /* CEPH_OSD_FLAG_ORDERSNAP | */ CEPH_OSD_FLAG_WRITE;
1498 
1499 	while ((len = iov_iter_count(from)) > 0) {
1500 		size_t left;
1501 		int n;
1502 
1503 		vino = ceph_vino(inode);
1504 		req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
1505 					    vino, pos, &len, 0, 1,
1506 					    CEPH_OSD_OP_WRITE, flags, snapc,
1507 					    ci->i_truncate_seq,
1508 					    ci->i_truncate_size,
1509 					    false);
1510 		if (IS_ERR(req)) {
1511 			ret = PTR_ERR(req);
1512 			break;
1513 		}
1514 
1515 		/*
1516 		 * write from beginning of first page,
1517 		 * regardless of io alignment
1518 		 */
1519 		num_pages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
1520 
1521 		pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL);
1522 		if (IS_ERR(pages)) {
1523 			ret = PTR_ERR(pages);
1524 			goto out;
1525 		}
1526 
1527 		left = len;
1528 		for (n = 0; n < num_pages; n++) {
1529 			size_t plen = min_t(size_t, left, PAGE_SIZE);
1530 			ret = copy_page_from_iter(pages[n], 0, plen, from);
1531 			if (ret != plen) {
1532 				ret = -EFAULT;
1533 				break;
1534 			}
1535 			left -= ret;
1536 		}
1537 
1538 		if (ret < 0) {
1539 			ceph_release_page_vector(pages, num_pages);
1540 			goto out;
1541 		}
1542 
1543 		req->r_inode = inode;
1544 
1545 		osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0,
1546 						false, true);
1547 
1548 		req->r_mtime = mtime;
1549 		ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
1550 		if (!ret)
1551 			ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
1552 
1553 		ceph_update_write_metrics(&fsc->mdsc->metric, req->r_start_latency,
1554 					  req->r_end_latency, len, ret);
1555 out:
1556 		ceph_osdc_put_request(req);
1557 		if (ret != 0) {
1558 			ceph_set_error_write(ci);
1559 			break;
1560 		}
1561 
1562 		ceph_clear_error_write(ci);
1563 		pos += len;
1564 		written += len;
1565 		if (pos > i_size_read(inode)) {
1566 			check_caps = ceph_inode_set_size(inode, pos);
1567 			if (check_caps)
1568 				ceph_check_caps(ceph_inode(inode),
1569 						CHECK_CAPS_AUTHONLY,
1570 						NULL);
1571 		}
1572 
1573 	}
1574 
1575 	if (ret != -EOLDSNAPC && written > 0) {
1576 		ret = written;
1577 		iocb->ki_pos = pos;
1578 	}
1579 	return ret;
1580 }
1581 
1582 /*
1583  * Wrap generic_file_aio_read with checks for cap bits on the inode.
1584  * Atomically grab references, so that those bits are not released
1585  * back to the MDS mid-read.
1586  *
1587  * Hmm, the sync read case isn't actually async... should it be?
1588  */
ceph_read_iter(struct kiocb * iocb,struct iov_iter * to)1589 static ssize_t ceph_read_iter(struct kiocb *iocb, struct iov_iter *to)
1590 {
1591 	struct file *filp = iocb->ki_filp;
1592 	struct ceph_file_info *fi = filp->private_data;
1593 	size_t len = iov_iter_count(to);
1594 	struct inode *inode = file_inode(filp);
1595 	struct ceph_inode_info *ci = ceph_inode(inode);
1596 	bool direct_lock = iocb->ki_flags & IOCB_DIRECT;
1597 	ssize_t ret;
1598 	int want = 0, got = 0;
1599 	int retry_op = 0, read = 0;
1600 
1601 again:
1602 	dout("aio_read %p %llx.%llx %llu~%u trying to get caps on %p\n",
1603 	     inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len, inode);
1604 
1605 	if (ceph_inode_is_shutdown(inode))
1606 		return -ESTALE;
1607 
1608 	if (direct_lock)
1609 		ceph_start_io_direct(inode);
1610 	else
1611 		ceph_start_io_read(inode);
1612 
1613 	if (!(fi->flags & CEPH_F_SYNC) && !direct_lock)
1614 		want |= CEPH_CAP_FILE_CACHE;
1615 	if (fi->fmode & CEPH_FILE_MODE_LAZY)
1616 		want |= CEPH_CAP_FILE_LAZYIO;
1617 
1618 	ret = ceph_get_caps(filp, CEPH_CAP_FILE_RD, want, -1, &got);
1619 	if (ret < 0) {
1620 		if (direct_lock)
1621 			ceph_end_io_direct(inode);
1622 		else
1623 			ceph_end_io_read(inode);
1624 		return ret;
1625 	}
1626 
1627 	if ((got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0 ||
1628 	    (iocb->ki_flags & IOCB_DIRECT) ||
1629 	    (fi->flags & CEPH_F_SYNC)) {
1630 
1631 		dout("aio_sync_read %p %llx.%llx %llu~%u got cap refs on %s\n",
1632 		     inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
1633 		     ceph_cap_string(got));
1634 
1635 		if (ci->i_inline_version == CEPH_INLINE_NONE) {
1636 			if (!retry_op && (iocb->ki_flags & IOCB_DIRECT)) {
1637 				ret = ceph_direct_read_write(iocb, to,
1638 							     NULL, NULL);
1639 				if (ret >= 0 && ret < len)
1640 					retry_op = CHECK_EOF;
1641 			} else {
1642 				ret = ceph_sync_read(iocb, to, &retry_op);
1643 			}
1644 		} else {
1645 			retry_op = READ_INLINE;
1646 		}
1647 	} else {
1648 		CEPH_DEFINE_RW_CONTEXT(rw_ctx, got);
1649 		dout("aio_read %p %llx.%llx %llu~%u got cap refs on %s\n",
1650 		     inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
1651 		     ceph_cap_string(got));
1652 		ceph_add_rw_context(fi, &rw_ctx);
1653 		ret = generic_file_read_iter(iocb, to);
1654 		ceph_del_rw_context(fi, &rw_ctx);
1655 	}
1656 
1657 	dout("aio_read %p %llx.%llx dropping cap refs on %s = %d\n",
1658 	     inode, ceph_vinop(inode), ceph_cap_string(got), (int)ret);
1659 	ceph_put_cap_refs(ci, got);
1660 
1661 	if (direct_lock)
1662 		ceph_end_io_direct(inode);
1663 	else
1664 		ceph_end_io_read(inode);
1665 
1666 	if (retry_op > HAVE_RETRIED && ret >= 0) {
1667 		int statret;
1668 		struct page *page = NULL;
1669 		loff_t i_size;
1670 		if (retry_op == READ_INLINE) {
1671 			page = __page_cache_alloc(GFP_KERNEL);
1672 			if (!page)
1673 				return -ENOMEM;
1674 		}
1675 
1676 		statret = __ceph_do_getattr(inode, page,
1677 					    CEPH_STAT_CAP_INLINE_DATA, !!page);
1678 		if (statret < 0) {
1679 			if (page)
1680 				__free_page(page);
1681 			if (statret == -ENODATA) {
1682 				BUG_ON(retry_op != READ_INLINE);
1683 				goto again;
1684 			}
1685 			return statret;
1686 		}
1687 
1688 		i_size = i_size_read(inode);
1689 		if (retry_op == READ_INLINE) {
1690 			BUG_ON(ret > 0 || read > 0);
1691 			if (iocb->ki_pos < i_size &&
1692 			    iocb->ki_pos < PAGE_SIZE) {
1693 				loff_t end = min_t(loff_t, i_size,
1694 						   iocb->ki_pos + len);
1695 				end = min_t(loff_t, end, PAGE_SIZE);
1696 				if (statret < end)
1697 					zero_user_segment(page, statret, end);
1698 				ret = copy_page_to_iter(page,
1699 						iocb->ki_pos & ~PAGE_MASK,
1700 						end - iocb->ki_pos, to);
1701 				iocb->ki_pos += ret;
1702 				read += ret;
1703 			}
1704 			if (iocb->ki_pos < i_size && read < len) {
1705 				size_t zlen = min_t(size_t, len - read,
1706 						    i_size - iocb->ki_pos);
1707 				ret = iov_iter_zero(zlen, to);
1708 				iocb->ki_pos += ret;
1709 				read += ret;
1710 			}
1711 			__free_pages(page, 0);
1712 			return read;
1713 		}
1714 
1715 		/* hit EOF or hole? */
1716 		if (retry_op == CHECK_EOF && iocb->ki_pos < i_size &&
1717 		    ret < len) {
1718 			dout("sync_read hit hole, ppos %lld < size %lld"
1719 			     ", reading more\n", iocb->ki_pos, i_size);
1720 
1721 			read += ret;
1722 			len -= ret;
1723 			retry_op = HAVE_RETRIED;
1724 			goto again;
1725 		}
1726 	}
1727 
1728 	if (ret >= 0)
1729 		ret += read;
1730 
1731 	return ret;
1732 }
1733 
1734 /*
1735  * Take cap references to avoid releasing caps to MDS mid-write.
1736  *
1737  * If we are synchronous, and write with an old snap context, the OSD
1738  * may return EOLDSNAPC.  In that case, retry the write.. _after_
1739  * dropping our cap refs and allowing the pending snap to logically
1740  * complete _before_ this write occurs.
1741  *
1742  * If we are near ENOSPC, write synchronously.
1743  */
ceph_write_iter(struct kiocb * iocb,struct iov_iter * from)1744 static ssize_t ceph_write_iter(struct kiocb *iocb, struct iov_iter *from)
1745 {
1746 	struct file *file = iocb->ki_filp;
1747 	struct ceph_file_info *fi = file->private_data;
1748 	struct inode *inode = file_inode(file);
1749 	struct ceph_inode_info *ci = ceph_inode(inode);
1750 	struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1751 	struct ceph_osd_client *osdc = &fsc->client->osdc;
1752 	struct ceph_cap_flush *prealloc_cf;
1753 	ssize_t count, written = 0;
1754 	int err, want = 0, got;
1755 	bool direct_lock = false;
1756 	u32 map_flags;
1757 	u64 pool_flags;
1758 	loff_t pos;
1759 	loff_t limit = max(i_size_read(inode), fsc->max_file_size);
1760 
1761 	if (ceph_inode_is_shutdown(inode))
1762 		return -ESTALE;
1763 
1764 	if (ceph_snap(inode) != CEPH_NOSNAP)
1765 		return -EROFS;
1766 
1767 	prealloc_cf = ceph_alloc_cap_flush();
1768 	if (!prealloc_cf)
1769 		return -ENOMEM;
1770 
1771 	if ((iocb->ki_flags & (IOCB_DIRECT | IOCB_APPEND)) == IOCB_DIRECT)
1772 		direct_lock = true;
1773 
1774 retry_snap:
1775 	if (direct_lock)
1776 		ceph_start_io_direct(inode);
1777 	else
1778 		ceph_start_io_write(inode);
1779 
1780 	/* We can write back this queue in page reclaim */
1781 	current->backing_dev_info = inode_to_bdi(inode);
1782 
1783 	if (iocb->ki_flags & IOCB_APPEND) {
1784 		err = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false);
1785 		if (err < 0)
1786 			goto out;
1787 	}
1788 
1789 	err = generic_write_checks(iocb, from);
1790 	if (err <= 0)
1791 		goto out;
1792 
1793 	pos = iocb->ki_pos;
1794 	if (unlikely(pos >= limit)) {
1795 		err = -EFBIG;
1796 		goto out;
1797 	} else {
1798 		iov_iter_truncate(from, limit - pos);
1799 	}
1800 
1801 	count = iov_iter_count(from);
1802 	if (ceph_quota_is_max_bytes_exceeded(inode, pos + count)) {
1803 		err = -EDQUOT;
1804 		goto out;
1805 	}
1806 
1807 	down_read(&osdc->lock);
1808 	map_flags = osdc->osdmap->flags;
1809 	pool_flags = ceph_pg_pool_flags(osdc->osdmap, ci->i_layout.pool_id);
1810 	up_read(&osdc->lock);
1811 	if ((map_flags & CEPH_OSDMAP_FULL) ||
1812 	    (pool_flags & CEPH_POOL_FLAG_FULL)) {
1813 		err = -ENOSPC;
1814 		goto out;
1815 	}
1816 
1817 	err = file_remove_privs(file);
1818 	if (err)
1819 		goto out;
1820 
1821 	dout("aio_write %p %llx.%llx %llu~%zd getting caps. i_size %llu\n",
1822 	     inode, ceph_vinop(inode), pos, count, i_size_read(inode));
1823 	if (!(fi->flags & CEPH_F_SYNC) && !direct_lock)
1824 		want |= CEPH_CAP_FILE_BUFFER;
1825 	if (fi->fmode & CEPH_FILE_MODE_LAZY)
1826 		want |= CEPH_CAP_FILE_LAZYIO;
1827 	got = 0;
1828 	err = ceph_get_caps(file, CEPH_CAP_FILE_WR, want, pos + count, &got);
1829 	if (err < 0)
1830 		goto out;
1831 
1832 	err = file_update_time(file);
1833 	if (err)
1834 		goto out_caps;
1835 
1836 	inode_inc_iversion_raw(inode);
1837 
1838 	dout("aio_write %p %llx.%llx %llu~%zd got cap refs on %s\n",
1839 	     inode, ceph_vinop(inode), pos, count, ceph_cap_string(got));
1840 
1841 	if ((got & (CEPH_CAP_FILE_BUFFER|CEPH_CAP_FILE_LAZYIO)) == 0 ||
1842 	    (iocb->ki_flags & IOCB_DIRECT) || (fi->flags & CEPH_F_SYNC) ||
1843 	    (ci->i_ceph_flags & CEPH_I_ERROR_WRITE)) {
1844 		struct ceph_snap_context *snapc;
1845 		struct iov_iter data;
1846 
1847 		spin_lock(&ci->i_ceph_lock);
1848 		if (__ceph_have_pending_cap_snap(ci)) {
1849 			struct ceph_cap_snap *capsnap =
1850 					list_last_entry(&ci->i_cap_snaps,
1851 							struct ceph_cap_snap,
1852 							ci_item);
1853 			snapc = ceph_get_snap_context(capsnap->context);
1854 		} else {
1855 			BUG_ON(!ci->i_head_snapc);
1856 			snapc = ceph_get_snap_context(ci->i_head_snapc);
1857 		}
1858 		spin_unlock(&ci->i_ceph_lock);
1859 
1860 		/* we might need to revert back to that point */
1861 		data = *from;
1862 		if (iocb->ki_flags & IOCB_DIRECT)
1863 			written = ceph_direct_read_write(iocb, &data, snapc,
1864 							 &prealloc_cf);
1865 		else
1866 			written = ceph_sync_write(iocb, &data, pos, snapc);
1867 		if (direct_lock)
1868 			ceph_end_io_direct(inode);
1869 		else
1870 			ceph_end_io_write(inode);
1871 		if (written > 0)
1872 			iov_iter_advance(from, written);
1873 		ceph_put_snap_context(snapc);
1874 	} else {
1875 		/*
1876 		 * No need to acquire the i_truncate_mutex. Because
1877 		 * the MDS revokes Fwb caps before sending truncate
1878 		 * message to us. We can't get Fwb cap while there
1879 		 * are pending vmtruncate. So write and vmtruncate
1880 		 * can not run at the same time
1881 		 */
1882 		written = generic_perform_write(iocb, from);
1883 		if (likely(written >= 0))
1884 			iocb->ki_pos = pos + written;
1885 		ceph_end_io_write(inode);
1886 	}
1887 
1888 	if (written >= 0) {
1889 		int dirty;
1890 
1891 		spin_lock(&ci->i_ceph_lock);
1892 		dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
1893 					       &prealloc_cf);
1894 		spin_unlock(&ci->i_ceph_lock);
1895 		if (dirty)
1896 			__mark_inode_dirty(inode, dirty);
1897 		if (ceph_quota_is_max_bytes_approaching(inode, iocb->ki_pos))
1898 			ceph_check_caps(ci, 0, NULL);
1899 	}
1900 
1901 	dout("aio_write %p %llx.%llx %llu~%u  dropping cap refs on %s\n",
1902 	     inode, ceph_vinop(inode), pos, (unsigned)count,
1903 	     ceph_cap_string(got));
1904 	ceph_put_cap_refs(ci, got);
1905 
1906 	if (written == -EOLDSNAPC) {
1907 		dout("aio_write %p %llx.%llx %llu~%u" "got EOLDSNAPC, retrying\n",
1908 		     inode, ceph_vinop(inode), pos, (unsigned)count);
1909 		goto retry_snap;
1910 	}
1911 
1912 	if (written >= 0) {
1913 		if ((map_flags & CEPH_OSDMAP_NEARFULL) ||
1914 		    (pool_flags & CEPH_POOL_FLAG_NEARFULL))
1915 			iocb->ki_flags |= IOCB_DSYNC;
1916 		written = generic_write_sync(iocb, written);
1917 	}
1918 
1919 	goto out_unlocked;
1920 out_caps:
1921 	ceph_put_cap_refs(ci, got);
1922 out:
1923 	if (direct_lock)
1924 		ceph_end_io_direct(inode);
1925 	else
1926 		ceph_end_io_write(inode);
1927 out_unlocked:
1928 	ceph_free_cap_flush(prealloc_cf);
1929 	current->backing_dev_info = NULL;
1930 	return written ? written : err;
1931 }
1932 
1933 /*
1934  * llseek.  be sure to verify file size on SEEK_END.
1935  */
ceph_llseek(struct file * file,loff_t offset,int whence)1936 static loff_t ceph_llseek(struct file *file, loff_t offset, int whence)
1937 {
1938 	struct inode *inode = file->f_mapping->host;
1939 	struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1940 	loff_t i_size;
1941 	loff_t ret;
1942 
1943 	inode_lock(inode);
1944 
1945 	if (whence == SEEK_END || whence == SEEK_DATA || whence == SEEK_HOLE) {
1946 		ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false);
1947 		if (ret < 0)
1948 			goto out;
1949 	}
1950 
1951 	i_size = i_size_read(inode);
1952 	switch (whence) {
1953 	case SEEK_END:
1954 		offset += i_size;
1955 		break;
1956 	case SEEK_CUR:
1957 		/*
1958 		 * Here we special-case the lseek(fd, 0, SEEK_CUR)
1959 		 * position-querying operation.  Avoid rewriting the "same"
1960 		 * f_pos value back to the file because a concurrent read(),
1961 		 * write() or lseek() might have altered it
1962 		 */
1963 		if (offset == 0) {
1964 			ret = file->f_pos;
1965 			goto out;
1966 		}
1967 		offset += file->f_pos;
1968 		break;
1969 	case SEEK_DATA:
1970 		if (offset < 0 || offset >= i_size) {
1971 			ret = -ENXIO;
1972 			goto out;
1973 		}
1974 		break;
1975 	case SEEK_HOLE:
1976 		if (offset < 0 || offset >= i_size) {
1977 			ret = -ENXIO;
1978 			goto out;
1979 		}
1980 		offset = i_size;
1981 		break;
1982 	}
1983 
1984 	ret = vfs_setpos(file, offset, max(i_size, fsc->max_file_size));
1985 
1986 out:
1987 	inode_unlock(inode);
1988 	return ret;
1989 }
1990 
ceph_zero_partial_page(struct inode * inode,loff_t offset,unsigned size)1991 static inline void ceph_zero_partial_page(
1992 	struct inode *inode, loff_t offset, unsigned size)
1993 {
1994 	struct page *page;
1995 	pgoff_t index = offset >> PAGE_SHIFT;
1996 
1997 	page = find_lock_page(inode->i_mapping, index);
1998 	if (page) {
1999 		wait_on_page_writeback(page);
2000 		zero_user(page, offset & (PAGE_SIZE - 1), size);
2001 		unlock_page(page);
2002 		put_page(page);
2003 	}
2004 }
2005 
ceph_zero_pagecache_range(struct inode * inode,loff_t offset,loff_t length)2006 static void ceph_zero_pagecache_range(struct inode *inode, loff_t offset,
2007 				      loff_t length)
2008 {
2009 	loff_t nearly = round_up(offset, PAGE_SIZE);
2010 	if (offset < nearly) {
2011 		loff_t size = nearly - offset;
2012 		if (length < size)
2013 			size = length;
2014 		ceph_zero_partial_page(inode, offset, size);
2015 		offset += size;
2016 		length -= size;
2017 	}
2018 	if (length >= PAGE_SIZE) {
2019 		loff_t size = round_down(length, PAGE_SIZE);
2020 		truncate_pagecache_range(inode, offset, offset + size - 1);
2021 		offset += size;
2022 		length -= size;
2023 	}
2024 	if (length)
2025 		ceph_zero_partial_page(inode, offset, length);
2026 }
2027 
ceph_zero_partial_object(struct inode * inode,loff_t offset,loff_t * length)2028 static int ceph_zero_partial_object(struct inode *inode,
2029 				    loff_t offset, loff_t *length)
2030 {
2031 	struct ceph_inode_info *ci = ceph_inode(inode);
2032 	struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
2033 	struct ceph_osd_request *req;
2034 	int ret = 0;
2035 	loff_t zero = 0;
2036 	int op;
2037 
2038 	if (!length) {
2039 		op = offset ? CEPH_OSD_OP_DELETE : CEPH_OSD_OP_TRUNCATE;
2040 		length = &zero;
2041 	} else {
2042 		op = CEPH_OSD_OP_ZERO;
2043 	}
2044 
2045 	req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
2046 					ceph_vino(inode),
2047 					offset, length,
2048 					0, 1, op,
2049 					CEPH_OSD_FLAG_WRITE,
2050 					NULL, 0, 0, false);
2051 	if (IS_ERR(req)) {
2052 		ret = PTR_ERR(req);
2053 		goto out;
2054 	}
2055 
2056 	req->r_mtime = inode->i_mtime;
2057 	ret = ceph_osdc_start_request(&fsc->client->osdc, req, false);
2058 	if (!ret) {
2059 		ret = ceph_osdc_wait_request(&fsc->client->osdc, req);
2060 		if (ret == -ENOENT)
2061 			ret = 0;
2062 	}
2063 	ceph_osdc_put_request(req);
2064 
2065 out:
2066 	return ret;
2067 }
2068 
ceph_zero_objects(struct inode * inode,loff_t offset,loff_t length)2069 static int ceph_zero_objects(struct inode *inode, loff_t offset, loff_t length)
2070 {
2071 	int ret = 0;
2072 	struct ceph_inode_info *ci = ceph_inode(inode);
2073 	s32 stripe_unit = ci->i_layout.stripe_unit;
2074 	s32 stripe_count = ci->i_layout.stripe_count;
2075 	s32 object_size = ci->i_layout.object_size;
2076 	u64 object_set_size = object_size * stripe_count;
2077 	u64 nearly, t;
2078 
2079 	/* round offset up to next period boundary */
2080 	nearly = offset + object_set_size - 1;
2081 	t = nearly;
2082 	nearly -= do_div(t, object_set_size);
2083 
2084 	while (length && offset < nearly) {
2085 		loff_t size = length;
2086 		ret = ceph_zero_partial_object(inode, offset, &size);
2087 		if (ret < 0)
2088 			return ret;
2089 		offset += size;
2090 		length -= size;
2091 	}
2092 	while (length >= object_set_size) {
2093 		int i;
2094 		loff_t pos = offset;
2095 		for (i = 0; i < stripe_count; ++i) {
2096 			ret = ceph_zero_partial_object(inode, pos, NULL);
2097 			if (ret < 0)
2098 				return ret;
2099 			pos += stripe_unit;
2100 		}
2101 		offset += object_set_size;
2102 		length -= object_set_size;
2103 	}
2104 	while (length) {
2105 		loff_t size = length;
2106 		ret = ceph_zero_partial_object(inode, offset, &size);
2107 		if (ret < 0)
2108 			return ret;
2109 		offset += size;
2110 		length -= size;
2111 	}
2112 	return ret;
2113 }
2114 
ceph_fallocate(struct file * file,int mode,loff_t offset,loff_t length)2115 static long ceph_fallocate(struct file *file, int mode,
2116 				loff_t offset, loff_t length)
2117 {
2118 	struct ceph_file_info *fi = file->private_data;
2119 	struct inode *inode = file_inode(file);
2120 	struct ceph_inode_info *ci = ceph_inode(inode);
2121 	struct ceph_cap_flush *prealloc_cf;
2122 	int want, got = 0;
2123 	int dirty;
2124 	int ret = 0;
2125 	loff_t endoff = 0;
2126 	loff_t size;
2127 
2128 	if (mode != (FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
2129 		return -EOPNOTSUPP;
2130 
2131 	if (!S_ISREG(inode->i_mode))
2132 		return -EOPNOTSUPP;
2133 
2134 	prealloc_cf = ceph_alloc_cap_flush();
2135 	if (!prealloc_cf)
2136 		return -ENOMEM;
2137 
2138 	inode_lock(inode);
2139 
2140 	if (ceph_snap(inode) != CEPH_NOSNAP) {
2141 		ret = -EROFS;
2142 		goto unlock;
2143 	}
2144 
2145 	size = i_size_read(inode);
2146 
2147 	/* Are we punching a hole beyond EOF? */
2148 	if (offset >= size)
2149 		goto unlock;
2150 	if ((offset + length) > size)
2151 		length = size - offset;
2152 
2153 	if (fi->fmode & CEPH_FILE_MODE_LAZY)
2154 		want = CEPH_CAP_FILE_BUFFER | CEPH_CAP_FILE_LAZYIO;
2155 	else
2156 		want = CEPH_CAP_FILE_BUFFER;
2157 
2158 	ret = ceph_get_caps(file, CEPH_CAP_FILE_WR, want, endoff, &got);
2159 	if (ret < 0)
2160 		goto unlock;
2161 
2162 	filemap_invalidate_lock(inode->i_mapping);
2163 	ceph_fscache_invalidate(inode, false);
2164 	ceph_zero_pagecache_range(inode, offset, length);
2165 	ret = ceph_zero_objects(inode, offset, length);
2166 
2167 	if (!ret) {
2168 		spin_lock(&ci->i_ceph_lock);
2169 		dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_FILE_WR,
2170 					       &prealloc_cf);
2171 		spin_unlock(&ci->i_ceph_lock);
2172 		if (dirty)
2173 			__mark_inode_dirty(inode, dirty);
2174 	}
2175 	filemap_invalidate_unlock(inode->i_mapping);
2176 
2177 	ceph_put_cap_refs(ci, got);
2178 unlock:
2179 	inode_unlock(inode);
2180 	ceph_free_cap_flush(prealloc_cf);
2181 	return ret;
2182 }
2183 
2184 /*
2185  * This function tries to get FILE_WR capabilities for dst_ci and FILE_RD for
2186  * src_ci.  Two attempts are made to obtain both caps, and an error is return if
2187  * this fails; zero is returned on success.
2188  */
get_rd_wr_caps(struct file * src_filp,int * src_got,struct file * dst_filp,loff_t dst_endoff,int * dst_got)2189 static int get_rd_wr_caps(struct file *src_filp, int *src_got,
2190 			  struct file *dst_filp,
2191 			  loff_t dst_endoff, int *dst_got)
2192 {
2193 	int ret = 0;
2194 	bool retrying = false;
2195 
2196 retry_caps:
2197 	ret = ceph_get_caps(dst_filp, CEPH_CAP_FILE_WR, CEPH_CAP_FILE_BUFFER,
2198 			    dst_endoff, dst_got);
2199 	if (ret < 0)
2200 		return ret;
2201 
2202 	/*
2203 	 * Since we're already holding the FILE_WR capability for the dst file,
2204 	 * we would risk a deadlock by using ceph_get_caps.  Thus, we'll do some
2205 	 * retry dance instead to try to get both capabilities.
2206 	 */
2207 	ret = ceph_try_get_caps(file_inode(src_filp),
2208 				CEPH_CAP_FILE_RD, CEPH_CAP_FILE_SHARED,
2209 				false, src_got);
2210 	if (ret <= 0) {
2211 		/* Start by dropping dst_ci caps and getting src_ci caps */
2212 		ceph_put_cap_refs(ceph_inode(file_inode(dst_filp)), *dst_got);
2213 		if (retrying) {
2214 			if (!ret)
2215 				/* ceph_try_get_caps masks EAGAIN */
2216 				ret = -EAGAIN;
2217 			return ret;
2218 		}
2219 		ret = ceph_get_caps(src_filp, CEPH_CAP_FILE_RD,
2220 				    CEPH_CAP_FILE_SHARED, -1, src_got);
2221 		if (ret < 0)
2222 			return ret;
2223 		/*... drop src_ci caps too, and retry */
2224 		ceph_put_cap_refs(ceph_inode(file_inode(src_filp)), *src_got);
2225 		retrying = true;
2226 		goto retry_caps;
2227 	}
2228 	return ret;
2229 }
2230 
put_rd_wr_caps(struct ceph_inode_info * src_ci,int src_got,struct ceph_inode_info * dst_ci,int dst_got)2231 static void put_rd_wr_caps(struct ceph_inode_info *src_ci, int src_got,
2232 			   struct ceph_inode_info *dst_ci, int dst_got)
2233 {
2234 	ceph_put_cap_refs(src_ci, src_got);
2235 	ceph_put_cap_refs(dst_ci, dst_got);
2236 }
2237 
2238 /*
2239  * This function does several size-related checks, returning an error if:
2240  *  - source file is smaller than off+len
2241  *  - destination file size is not OK (inode_newsize_ok())
2242  *  - max bytes quotas is exceeded
2243  */
is_file_size_ok(struct inode * src_inode,struct inode * dst_inode,loff_t src_off,loff_t dst_off,size_t len)2244 static int is_file_size_ok(struct inode *src_inode, struct inode *dst_inode,
2245 			   loff_t src_off, loff_t dst_off, size_t len)
2246 {
2247 	loff_t size, endoff;
2248 
2249 	size = i_size_read(src_inode);
2250 	/*
2251 	 * Don't copy beyond source file EOF.  Instead of simply setting length
2252 	 * to (size - src_off), just drop to VFS default implementation, as the
2253 	 * local i_size may be stale due to other clients writing to the source
2254 	 * inode.
2255 	 */
2256 	if (src_off + len > size) {
2257 		dout("Copy beyond EOF (%llu + %zu > %llu)\n",
2258 		     src_off, len, size);
2259 		return -EOPNOTSUPP;
2260 	}
2261 	size = i_size_read(dst_inode);
2262 
2263 	endoff = dst_off + len;
2264 	if (inode_newsize_ok(dst_inode, endoff))
2265 		return -EOPNOTSUPP;
2266 
2267 	if (ceph_quota_is_max_bytes_exceeded(dst_inode, endoff))
2268 		return -EDQUOT;
2269 
2270 	return 0;
2271 }
2272 
2273 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)2274 ceph_alloc_copyfrom_request(struct ceph_osd_client *osdc,
2275 			    u64 src_snapid,
2276 			    struct ceph_object_id *src_oid,
2277 			    struct ceph_object_locator *src_oloc,
2278 			    struct ceph_object_id *dst_oid,
2279 			    struct ceph_object_locator *dst_oloc,
2280 			    u32 truncate_seq, u64 truncate_size)
2281 {
2282 	struct ceph_osd_request *req;
2283 	int ret;
2284 	u32 src_fadvise_flags =
2285 		CEPH_OSD_OP_FLAG_FADVISE_SEQUENTIAL |
2286 		CEPH_OSD_OP_FLAG_FADVISE_NOCACHE;
2287 	u32 dst_fadvise_flags =
2288 		CEPH_OSD_OP_FLAG_FADVISE_SEQUENTIAL |
2289 		CEPH_OSD_OP_FLAG_FADVISE_DONTNEED;
2290 
2291 	req = ceph_osdc_alloc_request(osdc, NULL, 1, false, GFP_KERNEL);
2292 	if (!req)
2293 		return ERR_PTR(-ENOMEM);
2294 
2295 	req->r_flags = CEPH_OSD_FLAG_WRITE;
2296 
2297 	ceph_oloc_copy(&req->r_t.base_oloc, dst_oloc);
2298 	ceph_oid_copy(&req->r_t.base_oid, dst_oid);
2299 
2300 	ret = osd_req_op_copy_from_init(req, src_snapid, 0,
2301 					src_oid, src_oloc,
2302 					src_fadvise_flags,
2303 					dst_fadvise_flags,
2304 					truncate_seq,
2305 					truncate_size,
2306 					CEPH_OSD_COPY_FROM_FLAG_TRUNCATE_SEQ);
2307 	if (ret)
2308 		goto out;
2309 
2310 	ret = ceph_osdc_alloc_messages(req, GFP_KERNEL);
2311 	if (ret)
2312 		goto out;
2313 
2314 	return req;
2315 
2316 out:
2317 	ceph_osdc_put_request(req);
2318 	return ERR_PTR(ret);
2319 }
2320 
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)2321 static ssize_t ceph_do_objects_copy(struct ceph_inode_info *src_ci, u64 *src_off,
2322 				    struct ceph_inode_info *dst_ci, u64 *dst_off,
2323 				    struct ceph_fs_client *fsc,
2324 				    size_t len, unsigned int flags)
2325 {
2326 	struct ceph_object_locator src_oloc, dst_oloc;
2327 	struct ceph_object_id src_oid, dst_oid;
2328 	struct ceph_osd_client *osdc;
2329 	struct ceph_osd_request *req;
2330 	size_t bytes = 0;
2331 	u64 src_objnum, src_objoff, dst_objnum, dst_objoff;
2332 	u32 src_objlen, dst_objlen;
2333 	u32 object_size = src_ci->i_layout.object_size;
2334 	int ret;
2335 
2336 	src_oloc.pool = src_ci->i_layout.pool_id;
2337 	src_oloc.pool_ns = ceph_try_get_string(src_ci->i_layout.pool_ns);
2338 	dst_oloc.pool = dst_ci->i_layout.pool_id;
2339 	dst_oloc.pool_ns = ceph_try_get_string(dst_ci->i_layout.pool_ns);
2340 	osdc = &fsc->client->osdc;
2341 
2342 	while (len >= object_size) {
2343 		ceph_calc_file_object_mapping(&src_ci->i_layout, *src_off,
2344 					      object_size, &src_objnum,
2345 					      &src_objoff, &src_objlen);
2346 		ceph_calc_file_object_mapping(&dst_ci->i_layout, *dst_off,
2347 					      object_size, &dst_objnum,
2348 					      &dst_objoff, &dst_objlen);
2349 		ceph_oid_init(&src_oid);
2350 		ceph_oid_printf(&src_oid, "%llx.%08llx",
2351 				src_ci->i_vino.ino, src_objnum);
2352 		ceph_oid_init(&dst_oid);
2353 		ceph_oid_printf(&dst_oid, "%llx.%08llx",
2354 				dst_ci->i_vino.ino, dst_objnum);
2355 		/* Do an object remote copy */
2356 		req = ceph_alloc_copyfrom_request(osdc, src_ci->i_vino.snap,
2357 						  &src_oid, &src_oloc,
2358 						  &dst_oid, &dst_oloc,
2359 						  dst_ci->i_truncate_seq,
2360 						  dst_ci->i_truncate_size);
2361 		if (IS_ERR(req))
2362 			ret = PTR_ERR(req);
2363 		else {
2364 			ceph_osdc_start_request(osdc, req, false);
2365 			ret = ceph_osdc_wait_request(osdc, req);
2366 			ceph_update_copyfrom_metrics(&fsc->mdsc->metric,
2367 						     req->r_start_latency,
2368 						     req->r_end_latency,
2369 						     object_size, ret);
2370 			ceph_osdc_put_request(req);
2371 		}
2372 		if (ret) {
2373 			if (ret == -EOPNOTSUPP) {
2374 				fsc->have_copy_from2 = false;
2375 				pr_notice("OSDs don't support copy-from2; disabling copy offload\n");
2376 			}
2377 			dout("ceph_osdc_copy_from returned %d\n", ret);
2378 			if (!bytes)
2379 				bytes = ret;
2380 			goto out;
2381 		}
2382 		len -= object_size;
2383 		bytes += object_size;
2384 		*src_off += object_size;
2385 		*dst_off += object_size;
2386 	}
2387 
2388 out:
2389 	ceph_oloc_destroy(&src_oloc);
2390 	ceph_oloc_destroy(&dst_oloc);
2391 	return bytes;
2392 }
2393 
__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)2394 static ssize_t __ceph_copy_file_range(struct file *src_file, loff_t src_off,
2395 				      struct file *dst_file, loff_t dst_off,
2396 				      size_t len, unsigned int flags)
2397 {
2398 	struct inode *src_inode = file_inode(src_file);
2399 	struct inode *dst_inode = file_inode(dst_file);
2400 	struct ceph_inode_info *src_ci = ceph_inode(src_inode);
2401 	struct ceph_inode_info *dst_ci = ceph_inode(dst_inode);
2402 	struct ceph_cap_flush *prealloc_cf;
2403 	struct ceph_fs_client *src_fsc = ceph_inode_to_client(src_inode);
2404 	loff_t size;
2405 	ssize_t ret = -EIO, bytes;
2406 	u64 src_objnum, dst_objnum, src_objoff, dst_objoff;
2407 	u32 src_objlen, dst_objlen;
2408 	int src_got = 0, dst_got = 0, err, dirty;
2409 
2410 	if (src_inode->i_sb != dst_inode->i_sb) {
2411 		struct ceph_fs_client *dst_fsc = ceph_inode_to_client(dst_inode);
2412 
2413 		if (ceph_fsid_compare(&src_fsc->client->fsid,
2414 				      &dst_fsc->client->fsid)) {
2415 			dout("Copying files across clusters: src: %pU dst: %pU\n",
2416 			     &src_fsc->client->fsid, &dst_fsc->client->fsid);
2417 			return -EXDEV;
2418 		}
2419 	}
2420 	if (ceph_snap(dst_inode) != CEPH_NOSNAP)
2421 		return -EROFS;
2422 
2423 	/*
2424 	 * Some of the checks below will return -EOPNOTSUPP, which will force a
2425 	 * fallback to the default VFS copy_file_range implementation.  This is
2426 	 * desirable in several cases (for ex, the 'len' is smaller than the
2427 	 * size of the objects, or in cases where that would be more
2428 	 * efficient).
2429 	 */
2430 
2431 	if (ceph_test_mount_opt(src_fsc, NOCOPYFROM))
2432 		return -EOPNOTSUPP;
2433 
2434 	if (!src_fsc->have_copy_from2)
2435 		return -EOPNOTSUPP;
2436 
2437 	/*
2438 	 * Striped file layouts require that we copy partial objects, but the
2439 	 * OSD copy-from operation only supports full-object copies.  Limit
2440 	 * this to non-striped file layouts for now.
2441 	 */
2442 	if ((src_ci->i_layout.stripe_unit != dst_ci->i_layout.stripe_unit) ||
2443 	    (src_ci->i_layout.stripe_count != 1) ||
2444 	    (dst_ci->i_layout.stripe_count != 1) ||
2445 	    (src_ci->i_layout.object_size != dst_ci->i_layout.object_size)) {
2446 		dout("Invalid src/dst files layout\n");
2447 		return -EOPNOTSUPP;
2448 	}
2449 
2450 	if (len < src_ci->i_layout.object_size)
2451 		return -EOPNOTSUPP; /* no remote copy will be done */
2452 
2453 	prealloc_cf = ceph_alloc_cap_flush();
2454 	if (!prealloc_cf)
2455 		return -ENOMEM;
2456 
2457 	/* Start by sync'ing the source and destination files */
2458 	ret = file_write_and_wait_range(src_file, src_off, (src_off + len));
2459 	if (ret < 0) {
2460 		dout("failed to write src file (%zd)\n", ret);
2461 		goto out;
2462 	}
2463 	ret = file_write_and_wait_range(dst_file, dst_off, (dst_off + len));
2464 	if (ret < 0) {
2465 		dout("failed to write dst file (%zd)\n", ret);
2466 		goto out;
2467 	}
2468 
2469 	/*
2470 	 * We need FILE_WR caps for dst_ci and FILE_RD for src_ci as other
2471 	 * clients may have dirty data in their caches.  And OSDs know nothing
2472 	 * about caps, so they can't safely do the remote object copies.
2473 	 */
2474 	err = get_rd_wr_caps(src_file, &src_got,
2475 			     dst_file, (dst_off + len), &dst_got);
2476 	if (err < 0) {
2477 		dout("get_rd_wr_caps returned %d\n", err);
2478 		ret = -EOPNOTSUPP;
2479 		goto out;
2480 	}
2481 
2482 	ret = is_file_size_ok(src_inode, dst_inode, src_off, dst_off, len);
2483 	if (ret < 0)
2484 		goto out_caps;
2485 
2486 	/* Drop dst file cached pages */
2487 	ceph_fscache_invalidate(dst_inode, false);
2488 	ret = invalidate_inode_pages2_range(dst_inode->i_mapping,
2489 					    dst_off >> PAGE_SHIFT,
2490 					    (dst_off + len) >> PAGE_SHIFT);
2491 	if (ret < 0) {
2492 		dout("Failed to invalidate inode pages (%zd)\n", ret);
2493 		ret = 0; /* XXX */
2494 	}
2495 	ceph_calc_file_object_mapping(&src_ci->i_layout, src_off,
2496 				      src_ci->i_layout.object_size,
2497 				      &src_objnum, &src_objoff, &src_objlen);
2498 	ceph_calc_file_object_mapping(&dst_ci->i_layout, dst_off,
2499 				      dst_ci->i_layout.object_size,
2500 				      &dst_objnum, &dst_objoff, &dst_objlen);
2501 	/* object-level offsets need to the same */
2502 	if (src_objoff != dst_objoff) {
2503 		ret = -EOPNOTSUPP;
2504 		goto out_caps;
2505 	}
2506 
2507 	/*
2508 	 * Do a manual copy if the object offset isn't object aligned.
2509 	 * 'src_objlen' contains the bytes left until the end of the object,
2510 	 * starting at the src_off
2511 	 */
2512 	if (src_objoff) {
2513 		dout("Initial partial copy of %u bytes\n", src_objlen);
2514 
2515 		/*
2516 		 * we need to temporarily drop all caps as we'll be calling
2517 		 * {read,write}_iter, which will get caps again.
2518 		 */
2519 		put_rd_wr_caps(src_ci, src_got, dst_ci, dst_got);
2520 		ret = do_splice_direct(src_file, &src_off, dst_file,
2521 				       &dst_off, src_objlen, flags);
2522 		/* Abort on short copies or on error */
2523 		if (ret < src_objlen) {
2524 			dout("Failed partial copy (%zd)\n", ret);
2525 			goto out;
2526 		}
2527 		len -= ret;
2528 		err = get_rd_wr_caps(src_file, &src_got,
2529 				     dst_file, (dst_off + len), &dst_got);
2530 		if (err < 0)
2531 			goto out;
2532 		err = is_file_size_ok(src_inode, dst_inode,
2533 				      src_off, dst_off, len);
2534 		if (err < 0)
2535 			goto out_caps;
2536 	}
2537 
2538 	size = i_size_read(dst_inode);
2539 	bytes = ceph_do_objects_copy(src_ci, &src_off, dst_ci, &dst_off,
2540 				     src_fsc, len, flags);
2541 	if (bytes <= 0) {
2542 		if (!ret)
2543 			ret = bytes;
2544 		goto out_caps;
2545 	}
2546 	dout("Copied %zu bytes out of %zu\n", bytes, len);
2547 	len -= bytes;
2548 	ret += bytes;
2549 
2550 	file_update_time(dst_file);
2551 	inode_inc_iversion_raw(dst_inode);
2552 
2553 	if (dst_off > size) {
2554 		/* Let the MDS know about dst file size change */
2555 		if (ceph_inode_set_size(dst_inode, dst_off) ||
2556 		    ceph_quota_is_max_bytes_approaching(dst_inode, dst_off))
2557 			ceph_check_caps(dst_ci, CHECK_CAPS_AUTHONLY, NULL);
2558 	}
2559 	/* Mark Fw dirty */
2560 	spin_lock(&dst_ci->i_ceph_lock);
2561 	dirty = __ceph_mark_dirty_caps(dst_ci, CEPH_CAP_FILE_WR, &prealloc_cf);
2562 	spin_unlock(&dst_ci->i_ceph_lock);
2563 	if (dirty)
2564 		__mark_inode_dirty(dst_inode, dirty);
2565 
2566 out_caps:
2567 	put_rd_wr_caps(src_ci, src_got, dst_ci, dst_got);
2568 
2569 	/*
2570 	 * Do the final manual copy if we still have some bytes left, unless
2571 	 * there were errors in remote object copies (len >= object_size).
2572 	 */
2573 	if (len && (len < src_ci->i_layout.object_size)) {
2574 		dout("Final partial copy of %zu bytes\n", len);
2575 		bytes = do_splice_direct(src_file, &src_off, dst_file,
2576 					 &dst_off, len, flags);
2577 		if (bytes > 0)
2578 			ret += bytes;
2579 		else
2580 			dout("Failed partial copy (%zd)\n", bytes);
2581 	}
2582 
2583 out:
2584 	ceph_free_cap_flush(prealloc_cf);
2585 
2586 	return ret;
2587 }
2588 
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)2589 static ssize_t ceph_copy_file_range(struct file *src_file, loff_t src_off,
2590 				    struct file *dst_file, loff_t dst_off,
2591 				    size_t len, unsigned int flags)
2592 {
2593 	ssize_t ret;
2594 
2595 	ret = __ceph_copy_file_range(src_file, src_off, dst_file, dst_off,
2596 				     len, flags);
2597 
2598 	if (ret == -EOPNOTSUPP || ret == -EXDEV)
2599 		ret = generic_copy_file_range(src_file, src_off, dst_file,
2600 					      dst_off, len, flags);
2601 	return ret;
2602 }
2603 
2604 const struct file_operations ceph_file_fops = {
2605 	.open = ceph_open,
2606 	.release = ceph_release,
2607 	.llseek = ceph_llseek,
2608 	.read_iter = ceph_read_iter,
2609 	.write_iter = ceph_write_iter,
2610 	.mmap = ceph_mmap,
2611 	.fsync = ceph_fsync,
2612 	.lock = ceph_lock,
2613 	.setlease = simple_nosetlease,
2614 	.flock = ceph_flock,
2615 	.splice_read = generic_file_splice_read,
2616 	.splice_write = iter_file_splice_write,
2617 	.unlocked_ioctl = ceph_ioctl,
2618 	.compat_ioctl = compat_ptr_ioctl,
2619 	.fallocate	= ceph_fallocate,
2620 	.copy_file_range = ceph_copy_file_range,
2621 };
2622