1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * (C) 2001 Clemson University and The University of Chicago
4  * Copyright 2018 Omnibond Systems, L.L.C.
5  *
6  * See COPYING in top-level directory.
7  */
8 
9 /*
10  *  Linux VFS inode operations.
11  */
12 
13 #include <linux/blkdev.h>
14 #include <linux/fileattr.h>
15 #include "protocol.h"
16 #include "orangefs-kernel.h"
17 #include "orangefs-bufmap.h"
18 
orangefs_writepage_locked(struct page * page,struct writeback_control * wbc)19 static int orangefs_writepage_locked(struct page *page,
20     struct writeback_control *wbc)
21 {
22 	struct inode *inode = page->mapping->host;
23 	struct orangefs_write_range *wr = NULL;
24 	struct iov_iter iter;
25 	struct bio_vec bv;
26 	size_t len, wlen;
27 	ssize_t ret;
28 	loff_t off;
29 
30 	set_page_writeback(page);
31 
32 	len = i_size_read(inode);
33 	if (PagePrivate(page)) {
34 		wr = (struct orangefs_write_range *)page_private(page);
35 		WARN_ON(wr->pos >= len);
36 		off = wr->pos;
37 		if (off + wr->len > len)
38 			wlen = len - off;
39 		else
40 			wlen = wr->len;
41 	} else {
42 		WARN_ON(1);
43 		off = page_offset(page);
44 		if (off + PAGE_SIZE > len)
45 			wlen = len - off;
46 		else
47 			wlen = PAGE_SIZE;
48 	}
49 	/* Should've been handled in orangefs_invalidate_folio. */
50 	WARN_ON(off == len || off + wlen > len);
51 
52 	bv.bv_page = page;
53 	bv.bv_len = wlen;
54 	bv.bv_offset = off % PAGE_SIZE;
55 	WARN_ON(wlen == 0);
56 	iov_iter_bvec(&iter, WRITE, &bv, 1, wlen);
57 
58 	ret = wait_for_direct_io(ORANGEFS_IO_WRITE, inode, &off, &iter, wlen,
59 	    len, wr, NULL, NULL);
60 	if (ret < 0) {
61 		SetPageError(page);
62 		mapping_set_error(page->mapping, ret);
63 	} else {
64 		ret = 0;
65 	}
66 	kfree(detach_page_private(page));
67 	return ret;
68 }
69 
orangefs_writepage(struct page * page,struct writeback_control * wbc)70 static int orangefs_writepage(struct page *page, struct writeback_control *wbc)
71 {
72 	int ret;
73 	ret = orangefs_writepage_locked(page, wbc);
74 	unlock_page(page);
75 	end_page_writeback(page);
76 	return ret;
77 }
78 
79 struct orangefs_writepages {
80 	loff_t off;
81 	size_t len;
82 	kuid_t uid;
83 	kgid_t gid;
84 	int maxpages;
85 	int npages;
86 	struct page **pages;
87 	struct bio_vec *bv;
88 };
89 
orangefs_writepages_work(struct orangefs_writepages * ow,struct writeback_control * wbc)90 static int orangefs_writepages_work(struct orangefs_writepages *ow,
91     struct writeback_control *wbc)
92 {
93 	struct inode *inode = ow->pages[0]->mapping->host;
94 	struct orangefs_write_range *wrp, wr;
95 	struct iov_iter iter;
96 	ssize_t ret;
97 	size_t len;
98 	loff_t off;
99 	int i;
100 
101 	len = i_size_read(inode);
102 
103 	for (i = 0; i < ow->npages; i++) {
104 		set_page_writeback(ow->pages[i]);
105 		ow->bv[i].bv_page = ow->pages[i];
106 		ow->bv[i].bv_len = min(page_offset(ow->pages[i]) + PAGE_SIZE,
107 		    ow->off + ow->len) -
108 		    max(ow->off, page_offset(ow->pages[i]));
109 		if (i == 0)
110 			ow->bv[i].bv_offset = ow->off -
111 			    page_offset(ow->pages[i]);
112 		else
113 			ow->bv[i].bv_offset = 0;
114 	}
115 	iov_iter_bvec(&iter, WRITE, ow->bv, ow->npages, ow->len);
116 
117 	WARN_ON(ow->off >= len);
118 	if (ow->off + ow->len > len)
119 		ow->len = len - ow->off;
120 
121 	off = ow->off;
122 	wr.uid = ow->uid;
123 	wr.gid = ow->gid;
124 	ret = wait_for_direct_io(ORANGEFS_IO_WRITE, inode, &off, &iter, ow->len,
125 	    0, &wr, NULL, NULL);
126 	if (ret < 0) {
127 		for (i = 0; i < ow->npages; i++) {
128 			SetPageError(ow->pages[i]);
129 			mapping_set_error(ow->pages[i]->mapping, ret);
130 			if (PagePrivate(ow->pages[i])) {
131 				wrp = (struct orangefs_write_range *)
132 				    page_private(ow->pages[i]);
133 				ClearPagePrivate(ow->pages[i]);
134 				put_page(ow->pages[i]);
135 				kfree(wrp);
136 			}
137 			end_page_writeback(ow->pages[i]);
138 			unlock_page(ow->pages[i]);
139 		}
140 	} else {
141 		ret = 0;
142 		for (i = 0; i < ow->npages; i++) {
143 			if (PagePrivate(ow->pages[i])) {
144 				wrp = (struct orangefs_write_range *)
145 				    page_private(ow->pages[i]);
146 				ClearPagePrivate(ow->pages[i]);
147 				put_page(ow->pages[i]);
148 				kfree(wrp);
149 			}
150 			end_page_writeback(ow->pages[i]);
151 			unlock_page(ow->pages[i]);
152 		}
153 	}
154 	return ret;
155 }
156 
orangefs_writepages_callback(struct page * page,struct writeback_control * wbc,void * data)157 static int orangefs_writepages_callback(struct page *page,
158     struct writeback_control *wbc, void *data)
159 {
160 	struct orangefs_writepages *ow = data;
161 	struct orangefs_write_range *wr;
162 	int ret;
163 
164 	if (!PagePrivate(page)) {
165 		unlock_page(page);
166 		/* It's not private so there's nothing to write, right? */
167 		printk("writepages_callback not private!\n");
168 		BUG();
169 		return 0;
170 	}
171 	wr = (struct orangefs_write_range *)page_private(page);
172 
173 	ret = -1;
174 	if (ow->npages == 0) {
175 		ow->off = wr->pos;
176 		ow->len = wr->len;
177 		ow->uid = wr->uid;
178 		ow->gid = wr->gid;
179 		ow->pages[ow->npages++] = page;
180 		ret = 0;
181 		goto done;
182 	}
183 	if (!uid_eq(ow->uid, wr->uid) || !gid_eq(ow->gid, wr->gid)) {
184 		orangefs_writepages_work(ow, wbc);
185 		ow->npages = 0;
186 		ret = -1;
187 		goto done;
188 	}
189 	if (ow->off + ow->len == wr->pos) {
190 		ow->len += wr->len;
191 		ow->pages[ow->npages++] = page;
192 		ret = 0;
193 		goto done;
194 	}
195 done:
196 	if (ret == -1) {
197 		if (ow->npages) {
198 			orangefs_writepages_work(ow, wbc);
199 			ow->npages = 0;
200 		}
201 		ret = orangefs_writepage_locked(page, wbc);
202 		mapping_set_error(page->mapping, ret);
203 		unlock_page(page);
204 		end_page_writeback(page);
205 	} else {
206 		if (ow->npages == ow->maxpages) {
207 			orangefs_writepages_work(ow, wbc);
208 			ow->npages = 0;
209 		}
210 	}
211 	return ret;
212 }
213 
orangefs_writepages(struct address_space * mapping,struct writeback_control * wbc)214 static int orangefs_writepages(struct address_space *mapping,
215     struct writeback_control *wbc)
216 {
217 	struct orangefs_writepages *ow;
218 	struct blk_plug plug;
219 	int ret;
220 	ow = kzalloc(sizeof(struct orangefs_writepages), GFP_KERNEL);
221 	if (!ow)
222 		return -ENOMEM;
223 	ow->maxpages = orangefs_bufmap_size_query()/PAGE_SIZE;
224 	ow->pages = kcalloc(ow->maxpages, sizeof(struct page *), GFP_KERNEL);
225 	if (!ow->pages) {
226 		kfree(ow);
227 		return -ENOMEM;
228 	}
229 	ow->bv = kcalloc(ow->maxpages, sizeof(struct bio_vec), GFP_KERNEL);
230 	if (!ow->bv) {
231 		kfree(ow->pages);
232 		kfree(ow);
233 		return -ENOMEM;
234 	}
235 	blk_start_plug(&plug);
236 	ret = write_cache_pages(mapping, wbc, orangefs_writepages_callback, ow);
237 	if (ow->npages)
238 		ret = orangefs_writepages_work(ow, wbc);
239 	blk_finish_plug(&plug);
240 	kfree(ow->pages);
241 	kfree(ow->bv);
242 	kfree(ow);
243 	return ret;
244 }
245 
246 static int orangefs_launder_folio(struct folio *);
247 
orangefs_readahead(struct readahead_control * rac)248 static void orangefs_readahead(struct readahead_control *rac)
249 {
250 	loff_t offset;
251 	struct iov_iter iter;
252 	struct inode *inode = rac->mapping->host;
253 	struct xarray *i_pages;
254 	struct page *page;
255 	loff_t new_start = readahead_pos(rac);
256 	int ret;
257 	size_t new_len = 0;
258 
259 	loff_t bytes_remaining = inode->i_size - readahead_pos(rac);
260 	loff_t pages_remaining = bytes_remaining / PAGE_SIZE;
261 
262 	if (pages_remaining >= 1024)
263 		new_len = 4194304;
264 	else if (pages_remaining > readahead_count(rac))
265 		new_len = bytes_remaining;
266 
267 	if (new_len)
268 		readahead_expand(rac, new_start, new_len);
269 
270 	offset = readahead_pos(rac);
271 	i_pages = &rac->mapping->i_pages;
272 
273 	iov_iter_xarray(&iter, READ, i_pages, offset, readahead_length(rac));
274 
275 	/* read in the pages. */
276 	if ((ret = wait_for_direct_io(ORANGEFS_IO_READ, inode,
277 			&offset, &iter, readahead_length(rac),
278 			inode->i_size, NULL, NULL, rac->file)) < 0)
279 		gossip_debug(GOSSIP_FILE_DEBUG,
280 			"%s: wait_for_direct_io failed. \n", __func__);
281 	else
282 		ret = 0;
283 
284 	/* clean up. */
285 	while ((page = readahead_page(rac))) {
286 		page_endio(page, false, ret);
287 		put_page(page);
288 	}
289 }
290 
orangefs_read_folio(struct file * file,struct folio * folio)291 static int orangefs_read_folio(struct file *file, struct folio *folio)
292 {
293 	struct inode *inode = folio->mapping->host;
294 	struct iov_iter iter;
295 	struct bio_vec bv;
296 	ssize_t ret;
297 	loff_t off; /* offset of this folio in the file */
298 
299 	if (folio_test_dirty(folio))
300 		orangefs_launder_folio(folio);
301 
302 	off = folio_pos(folio);
303 	bv.bv_page = &folio->page;
304 	bv.bv_len = folio_size(folio);
305 	bv.bv_offset = 0;
306 	iov_iter_bvec(&iter, READ, &bv, 1, folio_size(folio));
307 
308 	ret = wait_for_direct_io(ORANGEFS_IO_READ, inode, &off, &iter,
309 			folio_size(folio), inode->i_size, NULL, NULL, file);
310 	/* this will only zero remaining unread portions of the page data */
311 	iov_iter_zero(~0U, &iter);
312 	/* takes care of potential aliasing */
313 	flush_dcache_folio(folio);
314 	if (ret < 0) {
315 		folio_set_error(folio);
316 	} else {
317 		folio_mark_uptodate(folio);
318 		if (folio_test_error(folio))
319 			folio_clear_error(folio);
320 		ret = 0;
321 	}
322 	/* unlock the folio after the ->read_folio() routine completes */
323 	folio_unlock(folio);
324         return ret;
325 }
326 
orangefs_write_begin(struct file * file,struct address_space * mapping,loff_t pos,unsigned len,struct page ** pagep,void ** fsdata)327 static int orangefs_write_begin(struct file *file,
328 		struct address_space *mapping, loff_t pos, unsigned len,
329 		struct page **pagep, void **fsdata)
330 {
331 	struct orangefs_write_range *wr;
332 	struct folio *folio;
333 	struct page *page;
334 	pgoff_t index;
335 	int ret;
336 
337 	index = pos >> PAGE_SHIFT;
338 
339 	page = grab_cache_page_write_begin(mapping, index);
340 	if (!page)
341 		return -ENOMEM;
342 
343 	*pagep = page;
344 	folio = page_folio(page);
345 
346 	if (folio_test_dirty(folio) && !folio_test_private(folio)) {
347 		/*
348 		 * Should be impossible.  If it happens, launder the page
349 		 * since we don't know what's dirty.  This will WARN in
350 		 * orangefs_writepage_locked.
351 		 */
352 		ret = orangefs_launder_folio(folio);
353 		if (ret)
354 			return ret;
355 	}
356 	if (folio_test_private(folio)) {
357 		struct orangefs_write_range *wr;
358 		wr = folio_get_private(folio);
359 		if (wr->pos + wr->len == pos &&
360 		    uid_eq(wr->uid, current_fsuid()) &&
361 		    gid_eq(wr->gid, current_fsgid())) {
362 			wr->len += len;
363 			goto okay;
364 		} else {
365 			ret = orangefs_launder_folio(folio);
366 			if (ret)
367 				return ret;
368 		}
369 	}
370 
371 	wr = kmalloc(sizeof *wr, GFP_KERNEL);
372 	if (!wr)
373 		return -ENOMEM;
374 
375 	wr->pos = pos;
376 	wr->len = len;
377 	wr->uid = current_fsuid();
378 	wr->gid = current_fsgid();
379 	folio_attach_private(folio, wr);
380 okay:
381 	return 0;
382 }
383 
orangefs_write_end(struct file * file,struct address_space * mapping,loff_t pos,unsigned len,unsigned copied,struct page * page,void * fsdata)384 static int orangefs_write_end(struct file *file, struct address_space *mapping,
385     loff_t pos, unsigned len, unsigned copied, struct page *page, void *fsdata)
386 {
387 	struct inode *inode = page->mapping->host;
388 	loff_t last_pos = pos + copied;
389 
390 	/*
391 	 * No need to use i_size_read() here, the i_size
392 	 * cannot change under us because we hold the i_mutex.
393 	 */
394 	if (last_pos > inode->i_size)
395 		i_size_write(inode, last_pos);
396 
397 	/* zero the stale part of the page if we did a short copy */
398 	if (!PageUptodate(page)) {
399 		unsigned from = pos & (PAGE_SIZE - 1);
400 		if (copied < len) {
401 			zero_user(page, from + copied, len - copied);
402 		}
403 		/* Set fully written pages uptodate. */
404 		if (pos == page_offset(page) &&
405 		    (len == PAGE_SIZE || pos + len == inode->i_size)) {
406 			zero_user_segment(page, from + copied, PAGE_SIZE);
407 			SetPageUptodate(page);
408 		}
409 	}
410 
411 	set_page_dirty(page);
412 	unlock_page(page);
413 	put_page(page);
414 
415 	mark_inode_dirty_sync(file_inode(file));
416 	return copied;
417 }
418 
orangefs_invalidate_folio(struct folio * folio,size_t offset,size_t length)419 static void orangefs_invalidate_folio(struct folio *folio,
420 				 size_t offset, size_t length)
421 {
422 	struct orangefs_write_range *wr = folio_get_private(folio);
423 
424 	if (offset == 0 && length == PAGE_SIZE) {
425 		kfree(folio_detach_private(folio));
426 		return;
427 	/* write range entirely within invalidate range (or equal) */
428 	} else if (folio_pos(folio) + offset <= wr->pos &&
429 	    wr->pos + wr->len <= folio_pos(folio) + offset + length) {
430 		kfree(folio_detach_private(folio));
431 		/* XXX is this right? only caller in fs */
432 		folio_cancel_dirty(folio);
433 		return;
434 	/* invalidate range chops off end of write range */
435 	} else if (wr->pos < folio_pos(folio) + offset &&
436 	    wr->pos + wr->len <= folio_pos(folio) + offset + length &&
437 	     folio_pos(folio) + offset < wr->pos + wr->len) {
438 		size_t x;
439 		x = wr->pos + wr->len - (folio_pos(folio) + offset);
440 		WARN_ON(x > wr->len);
441 		wr->len -= x;
442 		wr->uid = current_fsuid();
443 		wr->gid = current_fsgid();
444 	/* invalidate range chops off beginning of write range */
445 	} else if (folio_pos(folio) + offset <= wr->pos &&
446 	    folio_pos(folio) + offset + length < wr->pos + wr->len &&
447 	    wr->pos < folio_pos(folio) + offset + length) {
448 		size_t x;
449 		x = folio_pos(folio) + offset + length - wr->pos;
450 		WARN_ON(x > wr->len);
451 		wr->pos += x;
452 		wr->len -= x;
453 		wr->uid = current_fsuid();
454 		wr->gid = current_fsgid();
455 	/* invalidate range entirely within write range (punch hole) */
456 	} else if (wr->pos < folio_pos(folio) + offset &&
457 	    folio_pos(folio) + offset + length < wr->pos + wr->len) {
458 		/* XXX what do we do here... should not WARN_ON */
459 		WARN_ON(1);
460 		/* punch hole */
461 		/*
462 		 * should we just ignore this and write it out anyway?
463 		 * it hardly makes sense
464 		 */
465 		return;
466 	/* non-overlapping ranges */
467 	} else {
468 		/* WARN if they do overlap */
469 		if (!((folio_pos(folio) + offset + length <= wr->pos) ^
470 		    (wr->pos + wr->len <= folio_pos(folio) + offset))) {
471 			WARN_ON(1);
472 			printk("invalidate range offset %llu length %zu\n",
473 			    folio_pos(folio) + offset, length);
474 			printk("write range offset %llu length %zu\n",
475 			    wr->pos, wr->len);
476 		}
477 		return;
478 	}
479 
480 	/*
481 	 * Above there are returns where wr is freed or where we WARN.
482 	 * Thus the following runs if wr was modified above.
483 	 */
484 
485 	orangefs_launder_folio(folio);
486 }
487 
orangefs_release_folio(struct folio * folio,gfp_t foo)488 static bool orangefs_release_folio(struct folio *folio, gfp_t foo)
489 {
490 	return !folio_test_private(folio);
491 }
492 
orangefs_free_folio(struct folio * folio)493 static void orangefs_free_folio(struct folio *folio)
494 {
495 	kfree(folio_detach_private(folio));
496 }
497 
orangefs_launder_folio(struct folio * folio)498 static int orangefs_launder_folio(struct folio *folio)
499 {
500 	int r = 0;
501 	struct writeback_control wbc = {
502 		.sync_mode = WB_SYNC_ALL,
503 		.nr_to_write = 0,
504 	};
505 	folio_wait_writeback(folio);
506 	if (folio_clear_dirty_for_io(folio)) {
507 		r = orangefs_writepage_locked(&folio->page, &wbc);
508 		folio_end_writeback(folio);
509 	}
510 	return r;
511 }
512 
orangefs_direct_IO(struct kiocb * iocb,struct iov_iter * iter)513 static ssize_t orangefs_direct_IO(struct kiocb *iocb,
514 				  struct iov_iter *iter)
515 {
516 	/*
517 	 * Comment from original do_readv_writev:
518 	 * Common entry point for read/write/readv/writev
519 	 * This function will dispatch it to either the direct I/O
520 	 * or buffered I/O path depending on the mount options and/or
521 	 * augmented/extended metadata attached to the file.
522 	 * Note: File extended attributes override any mount options.
523 	 */
524 	struct file *file = iocb->ki_filp;
525 	loff_t pos = iocb->ki_pos;
526 	enum ORANGEFS_io_type type = iov_iter_rw(iter) == WRITE ?
527             ORANGEFS_IO_WRITE : ORANGEFS_IO_READ;
528 	loff_t *offset = &pos;
529 	struct inode *inode = file->f_mapping->host;
530 	struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
531 	struct orangefs_khandle *handle = &orangefs_inode->refn.khandle;
532 	size_t count = iov_iter_count(iter);
533 	ssize_t total_count = 0;
534 	ssize_t ret = -EINVAL;
535 	int i = 0;
536 
537 	gossip_debug(GOSSIP_FILE_DEBUG,
538 		"%s-BEGIN(%pU): count(%d) after estimate_max_iovecs.\n",
539 		__func__,
540 		handle,
541 		(int)count);
542 
543 	if (type == ORANGEFS_IO_WRITE) {
544 		gossip_debug(GOSSIP_FILE_DEBUG,
545 			     "%s(%pU): proceeding with offset : %llu, "
546 			     "size %d\n",
547 			     __func__,
548 			     handle,
549 			     llu(*offset),
550 			     (int)count);
551 	}
552 
553 	if (count == 0) {
554 		ret = 0;
555 		goto out;
556 	}
557 
558 	while (iov_iter_count(iter)) {
559 		size_t each_count = iov_iter_count(iter);
560 		size_t amt_complete;
561 		i++;
562 
563 		/* how much to transfer in this loop iteration */
564 		if (each_count > orangefs_bufmap_size_query())
565 			each_count = orangefs_bufmap_size_query();
566 
567 		gossip_debug(GOSSIP_FILE_DEBUG,
568 			     "%s(%pU): size of each_count(%d)\n",
569 			     __func__,
570 			     handle,
571 			     (int)each_count);
572 		gossip_debug(GOSSIP_FILE_DEBUG,
573 			     "%s(%pU): BEFORE wait_for_io: offset is %d\n",
574 			     __func__,
575 			     handle,
576 			     (int)*offset);
577 
578 		ret = wait_for_direct_io(type, inode, offset, iter,
579 				each_count, 0, NULL, NULL, file);
580 		gossip_debug(GOSSIP_FILE_DEBUG,
581 			     "%s(%pU): return from wait_for_io:%d\n",
582 			     __func__,
583 			     handle,
584 			     (int)ret);
585 
586 		if (ret < 0)
587 			goto out;
588 
589 		*offset += ret;
590 		total_count += ret;
591 		amt_complete = ret;
592 
593 		gossip_debug(GOSSIP_FILE_DEBUG,
594 			     "%s(%pU): AFTER wait_for_io: offset is %d\n",
595 			     __func__,
596 			     handle,
597 			     (int)*offset);
598 
599 		/*
600 		 * if we got a short I/O operations,
601 		 * fall out and return what we got so far
602 		 */
603 		if (amt_complete < each_count)
604 			break;
605 	} /*end while */
606 
607 out:
608 	if (total_count > 0)
609 		ret = total_count;
610 	if (ret > 0) {
611 		if (type == ORANGEFS_IO_READ) {
612 			file_accessed(file);
613 		} else {
614 			file_update_time(file);
615 			if (*offset > i_size_read(inode))
616 				i_size_write(inode, *offset);
617 		}
618 	}
619 
620 	gossip_debug(GOSSIP_FILE_DEBUG,
621 		     "%s(%pU): Value(%d) returned.\n",
622 		     __func__,
623 		     handle,
624 		     (int)ret);
625 
626 	return ret;
627 }
628 
629 /** ORANGEFS2 implementation of address space operations */
630 static const struct address_space_operations orangefs_address_operations = {
631 	.writepage = orangefs_writepage,
632 	.readahead = orangefs_readahead,
633 	.read_folio = orangefs_read_folio,
634 	.writepages = orangefs_writepages,
635 	.dirty_folio = filemap_dirty_folio,
636 	.write_begin = orangefs_write_begin,
637 	.write_end = orangefs_write_end,
638 	.invalidate_folio = orangefs_invalidate_folio,
639 	.release_folio = orangefs_release_folio,
640 	.free_folio = orangefs_free_folio,
641 	.launder_folio = orangefs_launder_folio,
642 	.direct_IO = orangefs_direct_IO,
643 };
644 
orangefs_page_mkwrite(struct vm_fault * vmf)645 vm_fault_t orangefs_page_mkwrite(struct vm_fault *vmf)
646 {
647 	struct folio *folio = page_folio(vmf->page);
648 	struct inode *inode = file_inode(vmf->vma->vm_file);
649 	struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
650 	unsigned long *bitlock = &orangefs_inode->bitlock;
651 	vm_fault_t ret;
652 	struct orangefs_write_range *wr;
653 
654 	sb_start_pagefault(inode->i_sb);
655 
656 	if (wait_on_bit(bitlock, 1, TASK_KILLABLE)) {
657 		ret = VM_FAULT_RETRY;
658 		goto out;
659 	}
660 
661 	folio_lock(folio);
662 	if (folio_test_dirty(folio) && !folio_test_private(folio)) {
663 		/*
664 		 * Should be impossible.  If it happens, launder the folio
665 		 * since we don't know what's dirty.  This will WARN in
666 		 * orangefs_writepage_locked.
667 		 */
668 		if (orangefs_launder_folio(folio)) {
669 			ret = VM_FAULT_LOCKED|VM_FAULT_RETRY;
670 			goto out;
671 		}
672 	}
673 	if (folio_test_private(folio)) {
674 		wr = folio_get_private(folio);
675 		if (uid_eq(wr->uid, current_fsuid()) &&
676 		    gid_eq(wr->gid, current_fsgid())) {
677 			wr->pos = page_offset(vmf->page);
678 			wr->len = PAGE_SIZE;
679 			goto okay;
680 		} else {
681 			if (orangefs_launder_folio(folio)) {
682 				ret = VM_FAULT_LOCKED|VM_FAULT_RETRY;
683 				goto out;
684 			}
685 		}
686 	}
687 	wr = kmalloc(sizeof *wr, GFP_KERNEL);
688 	if (!wr) {
689 		ret = VM_FAULT_LOCKED|VM_FAULT_RETRY;
690 		goto out;
691 	}
692 	wr->pos = page_offset(vmf->page);
693 	wr->len = PAGE_SIZE;
694 	wr->uid = current_fsuid();
695 	wr->gid = current_fsgid();
696 	folio_attach_private(folio, wr);
697 okay:
698 
699 	file_update_time(vmf->vma->vm_file);
700 	if (folio->mapping != inode->i_mapping) {
701 		folio_unlock(folio);
702 		ret = VM_FAULT_LOCKED|VM_FAULT_NOPAGE;
703 		goto out;
704 	}
705 
706 	/*
707 	 * We mark the folio dirty already here so that when freeze is in
708 	 * progress, we are guaranteed that writeback during freezing will
709 	 * see the dirty folio and writeprotect it again.
710 	 */
711 	folio_mark_dirty(folio);
712 	folio_wait_stable(folio);
713 	ret = VM_FAULT_LOCKED;
714 out:
715 	sb_end_pagefault(inode->i_sb);
716 	return ret;
717 }
718 
orangefs_setattr_size(struct inode * inode,struct iattr * iattr)719 static int orangefs_setattr_size(struct inode *inode, struct iattr *iattr)
720 {
721 	struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
722 	struct orangefs_kernel_op_s *new_op;
723 	loff_t orig_size;
724 	int ret = -EINVAL;
725 
726 	gossip_debug(GOSSIP_INODE_DEBUG,
727 		     "%s: %pU: Handle is %pU | fs_id %d | size is %llu\n",
728 		     __func__,
729 		     get_khandle_from_ino(inode),
730 		     &orangefs_inode->refn.khandle,
731 		     orangefs_inode->refn.fs_id,
732 		     iattr->ia_size);
733 
734 	/* Ensure that we have a up to date size, so we know if it changed. */
735 	ret = orangefs_inode_getattr(inode, ORANGEFS_GETATTR_SIZE);
736 	if (ret == -ESTALE)
737 		ret = -EIO;
738 	if (ret) {
739 		gossip_err("%s: orangefs_inode_getattr failed, ret:%d:.\n",
740 		    __func__, ret);
741 		return ret;
742 	}
743 	orig_size = i_size_read(inode);
744 
745 	/* This is truncate_setsize in a different order. */
746 	truncate_pagecache(inode, iattr->ia_size);
747 	i_size_write(inode, iattr->ia_size);
748 	if (iattr->ia_size > orig_size)
749 		pagecache_isize_extended(inode, orig_size, iattr->ia_size);
750 
751 	new_op = op_alloc(ORANGEFS_VFS_OP_TRUNCATE);
752 	if (!new_op)
753 		return -ENOMEM;
754 
755 	new_op->upcall.req.truncate.refn = orangefs_inode->refn;
756 	new_op->upcall.req.truncate.size = (__s64) iattr->ia_size;
757 
758 	ret = service_operation(new_op,
759 		__func__,
760 		get_interruptible_flag(inode));
761 
762 	/*
763 	 * the truncate has no downcall members to retrieve, but
764 	 * the status value tells us if it went through ok or not
765 	 */
766 	gossip_debug(GOSSIP_INODE_DEBUG, "%s: ret:%d:\n", __func__, ret);
767 
768 	op_release(new_op);
769 
770 	if (ret != 0)
771 		return ret;
772 
773 	if (orig_size != i_size_read(inode))
774 		iattr->ia_valid |= ATTR_CTIME | ATTR_MTIME;
775 
776 	return ret;
777 }
778 
__orangefs_setattr(struct inode * inode,struct iattr * iattr)779 int __orangefs_setattr(struct inode *inode, struct iattr *iattr)
780 {
781 	int ret;
782 
783 	if (iattr->ia_valid & ATTR_MODE) {
784 		if (iattr->ia_mode & (S_ISVTX)) {
785 			if (is_root_handle(inode)) {
786 				/*
787 				 * allow sticky bit to be set on root (since
788 				 * it shows up that way by default anyhow),
789 				 * but don't show it to the server
790 				 */
791 				iattr->ia_mode -= S_ISVTX;
792 			} else {
793 				gossip_debug(GOSSIP_UTILS_DEBUG,
794 					     "User attempted to set sticky bit on non-root directory; returning EINVAL.\n");
795 				ret = -EINVAL;
796 				goto out;
797 			}
798 		}
799 		if (iattr->ia_mode & (S_ISUID)) {
800 			gossip_debug(GOSSIP_UTILS_DEBUG,
801 				     "Attempting to set setuid bit (not supported); returning EINVAL.\n");
802 			ret = -EINVAL;
803 			goto out;
804 		}
805 	}
806 
807 	if (iattr->ia_valid & ATTR_SIZE) {
808 		ret = orangefs_setattr_size(inode, iattr);
809 		if (ret)
810 			goto out;
811 	}
812 
813 again:
814 	spin_lock(&inode->i_lock);
815 	if (ORANGEFS_I(inode)->attr_valid) {
816 		if (uid_eq(ORANGEFS_I(inode)->attr_uid, current_fsuid()) &&
817 		    gid_eq(ORANGEFS_I(inode)->attr_gid, current_fsgid())) {
818 			ORANGEFS_I(inode)->attr_valid = iattr->ia_valid;
819 		} else {
820 			spin_unlock(&inode->i_lock);
821 			write_inode_now(inode, 1);
822 			goto again;
823 		}
824 	} else {
825 		ORANGEFS_I(inode)->attr_valid = iattr->ia_valid;
826 		ORANGEFS_I(inode)->attr_uid = current_fsuid();
827 		ORANGEFS_I(inode)->attr_gid = current_fsgid();
828 	}
829 	setattr_copy(&init_user_ns, inode, iattr);
830 	spin_unlock(&inode->i_lock);
831 	mark_inode_dirty(inode);
832 
833 	if (iattr->ia_valid & ATTR_MODE)
834 		/* change mod on a file that has ACLs */
835 		ret = posix_acl_chmod(&init_user_ns, inode, inode->i_mode);
836 
837 	ret = 0;
838 out:
839 	return ret;
840 }
841 
842 /*
843  * Change attributes of an object referenced by dentry.
844  */
orangefs_setattr(struct user_namespace * mnt_userns,struct dentry * dentry,struct iattr * iattr)845 int orangefs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
846 		     struct iattr *iattr)
847 {
848 	int ret;
849 	gossip_debug(GOSSIP_INODE_DEBUG, "__orangefs_setattr: called on %pd\n",
850 	    dentry);
851 	ret = setattr_prepare(&init_user_ns, dentry, iattr);
852 	if (ret)
853 	        goto out;
854 	ret = __orangefs_setattr(d_inode(dentry), iattr);
855 	sync_inode_metadata(d_inode(dentry), 1);
856 out:
857 	gossip_debug(GOSSIP_INODE_DEBUG, "orangefs_setattr: returning %d\n",
858 	    ret);
859 	return ret;
860 }
861 
862 /*
863  * Obtain attributes of an object given a dentry
864  */
orangefs_getattr(struct user_namespace * mnt_userns,const struct path * path,struct kstat * stat,u32 request_mask,unsigned int flags)865 int orangefs_getattr(struct user_namespace *mnt_userns, const struct path *path,
866 		     struct kstat *stat, u32 request_mask, unsigned int flags)
867 {
868 	int ret;
869 	struct inode *inode = path->dentry->d_inode;
870 
871 	gossip_debug(GOSSIP_INODE_DEBUG,
872 		     "orangefs_getattr: called on %pd mask %u\n",
873 		     path->dentry, request_mask);
874 
875 	ret = orangefs_inode_getattr(inode,
876 	    request_mask & STATX_SIZE ? ORANGEFS_GETATTR_SIZE : 0);
877 	if (ret == 0) {
878 		generic_fillattr(&init_user_ns, inode, stat);
879 
880 		/* override block size reported to stat */
881 		if (!(request_mask & STATX_SIZE))
882 			stat->result_mask &= ~STATX_SIZE;
883 
884 		generic_fill_statx_attr(inode, stat);
885 	}
886 	return ret;
887 }
888 
orangefs_permission(struct user_namespace * mnt_userns,struct inode * inode,int mask)889 int orangefs_permission(struct user_namespace *mnt_userns,
890 			struct inode *inode, int mask)
891 {
892 	int ret;
893 
894 	if (mask & MAY_NOT_BLOCK)
895 		return -ECHILD;
896 
897 	gossip_debug(GOSSIP_INODE_DEBUG, "%s: refreshing\n", __func__);
898 
899 	/* Make sure the permission (and other common attrs) are up to date. */
900 	ret = orangefs_inode_getattr(inode, 0);
901 	if (ret < 0)
902 		return ret;
903 
904 	return generic_permission(&init_user_ns, inode, mask);
905 }
906 
orangefs_update_time(struct inode * inode,struct timespec64 * time,int flags)907 int orangefs_update_time(struct inode *inode, struct timespec64 *time, int flags)
908 {
909 	struct iattr iattr;
910 	gossip_debug(GOSSIP_INODE_DEBUG, "orangefs_update_time: %pU\n",
911 	    get_khandle_from_ino(inode));
912 	generic_update_time(inode, time, flags);
913 	memset(&iattr, 0, sizeof iattr);
914         if (flags & S_ATIME)
915 		iattr.ia_valid |= ATTR_ATIME;
916 	if (flags & S_CTIME)
917 		iattr.ia_valid |= ATTR_CTIME;
918 	if (flags & S_MTIME)
919 		iattr.ia_valid |= ATTR_MTIME;
920 	return __orangefs_setattr(inode, &iattr);
921 }
922 
orangefs_fileattr_get(struct dentry * dentry,struct fileattr * fa)923 static int orangefs_fileattr_get(struct dentry *dentry, struct fileattr *fa)
924 {
925 	u64 val = 0;
926 	int ret;
927 
928 	gossip_debug(GOSSIP_FILE_DEBUG, "%s: called on %pd\n", __func__,
929 		     dentry);
930 
931 	ret = orangefs_inode_getxattr(d_inode(dentry),
932 				      "user.pvfs2.meta_hint",
933 				      &val, sizeof(val));
934 	if (ret < 0 && ret != -ENODATA)
935 		return ret;
936 
937 	gossip_debug(GOSSIP_FILE_DEBUG, "%s: flags=%u\n", __func__, (u32) val);
938 
939 	fileattr_fill_flags(fa, val);
940 	return 0;
941 }
942 
orangefs_fileattr_set(struct user_namespace * mnt_userns,struct dentry * dentry,struct fileattr * fa)943 static int orangefs_fileattr_set(struct user_namespace *mnt_userns,
944 				 struct dentry *dentry, struct fileattr *fa)
945 {
946 	u64 val = 0;
947 
948 	gossip_debug(GOSSIP_FILE_DEBUG, "%s: called on %pd\n", __func__,
949 		     dentry);
950 	/*
951 	 * ORANGEFS_MIRROR_FL is set internally when the mirroring mode is
952 	 * turned on for a file. The user is not allowed to turn on this bit,
953 	 * but the bit is present if the user first gets the flags and then
954 	 * updates the flags with some new settings. So, we ignore it in the
955 	 * following edit. bligon.
956 	 */
957 	if (fileattr_has_fsx(fa) ||
958 	    (fa->flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | FS_NOATIME_FL | ORANGEFS_MIRROR_FL))) {
959 		gossip_err("%s: only supports setting one of FS_IMMUTABLE_FL|FS_APPEND_FL|FS_NOATIME_FL\n",
960 			   __func__);
961 		return -EOPNOTSUPP;
962 	}
963 	val = fa->flags;
964 	gossip_debug(GOSSIP_FILE_DEBUG, "%s: flags=%u\n", __func__, (u32) val);
965 	return orangefs_inode_setxattr(d_inode(dentry),
966 				       "user.pvfs2.meta_hint",
967 				       &val, sizeof(val), 0);
968 }
969 
970 /* ORANGEFS2 implementation of VFS inode operations for files */
971 static const struct inode_operations orangefs_file_inode_operations = {
972 	.get_acl = orangefs_get_acl,
973 	.set_acl = orangefs_set_acl,
974 	.setattr = orangefs_setattr,
975 	.getattr = orangefs_getattr,
976 	.listxattr = orangefs_listxattr,
977 	.permission = orangefs_permission,
978 	.update_time = orangefs_update_time,
979 	.fileattr_get = orangefs_fileattr_get,
980 	.fileattr_set = orangefs_fileattr_set,
981 };
982 
orangefs_init_iops(struct inode * inode)983 static int orangefs_init_iops(struct inode *inode)
984 {
985 	inode->i_mapping->a_ops = &orangefs_address_operations;
986 
987 	switch (inode->i_mode & S_IFMT) {
988 	case S_IFREG:
989 		inode->i_op = &orangefs_file_inode_operations;
990 		inode->i_fop = &orangefs_file_operations;
991 		break;
992 	case S_IFLNK:
993 		inode->i_op = &orangefs_symlink_inode_operations;
994 		break;
995 	case S_IFDIR:
996 		inode->i_op = &orangefs_dir_inode_operations;
997 		inode->i_fop = &orangefs_dir_operations;
998 		break;
999 	default:
1000 		gossip_debug(GOSSIP_INODE_DEBUG,
1001 			     "%s: unsupported mode\n",
1002 			     __func__);
1003 		return -EINVAL;
1004 	}
1005 
1006 	return 0;
1007 }
1008 
1009 /*
1010  * Given an ORANGEFS object identifier (fsid, handle), convert it into
1011  * a ino_t type that will be used as a hash-index from where the handle will
1012  * be searched for in the VFS hash table of inodes.
1013  */
orangefs_handle_hash(struct orangefs_object_kref * ref)1014 static inline ino_t orangefs_handle_hash(struct orangefs_object_kref *ref)
1015 {
1016 	if (!ref)
1017 		return 0;
1018 	return orangefs_khandle_to_ino(&(ref->khandle));
1019 }
1020 
1021 /*
1022  * Called to set up an inode from iget5_locked.
1023  */
orangefs_set_inode(struct inode * inode,void * data)1024 static int orangefs_set_inode(struct inode *inode, void *data)
1025 {
1026 	struct orangefs_object_kref *ref = (struct orangefs_object_kref *) data;
1027 	ORANGEFS_I(inode)->refn.fs_id = ref->fs_id;
1028 	ORANGEFS_I(inode)->refn.khandle = ref->khandle;
1029 	ORANGEFS_I(inode)->attr_valid = 0;
1030 	hash_init(ORANGEFS_I(inode)->xattr_cache);
1031 	ORANGEFS_I(inode)->mapping_time = jiffies - 1;
1032 	ORANGEFS_I(inode)->bitlock = 0;
1033 	return 0;
1034 }
1035 
1036 /*
1037  * Called to determine if handles match.
1038  */
orangefs_test_inode(struct inode * inode,void * data)1039 static int orangefs_test_inode(struct inode *inode, void *data)
1040 {
1041 	struct orangefs_object_kref *ref = (struct orangefs_object_kref *) data;
1042 	struct orangefs_inode_s *orangefs_inode = NULL;
1043 
1044 	orangefs_inode = ORANGEFS_I(inode);
1045 	/* test handles and fs_ids... */
1046 	return (!ORANGEFS_khandle_cmp(&(orangefs_inode->refn.khandle),
1047 				&(ref->khandle)) &&
1048 			orangefs_inode->refn.fs_id == ref->fs_id);
1049 }
1050 
1051 /*
1052  * Front-end to lookup the inode-cache maintained by the VFS using the ORANGEFS
1053  * file handle.
1054  *
1055  * @sb: the file system super block instance.
1056  * @ref: The ORANGEFS object for which we are trying to locate an inode.
1057  */
orangefs_iget(struct super_block * sb,struct orangefs_object_kref * ref)1058 struct inode *orangefs_iget(struct super_block *sb,
1059 		struct orangefs_object_kref *ref)
1060 {
1061 	struct inode *inode = NULL;
1062 	unsigned long hash;
1063 	int error;
1064 
1065 	hash = orangefs_handle_hash(ref);
1066 	inode = iget5_locked(sb,
1067 			hash,
1068 			orangefs_test_inode,
1069 			orangefs_set_inode,
1070 			ref);
1071 
1072 	if (!inode)
1073 		return ERR_PTR(-ENOMEM);
1074 
1075 	if (!(inode->i_state & I_NEW))
1076 		return inode;
1077 
1078 	error = orangefs_inode_getattr(inode, ORANGEFS_GETATTR_NEW);
1079 	if (error) {
1080 		iget_failed(inode);
1081 		return ERR_PTR(error);
1082 	}
1083 
1084 	inode->i_ino = hash;	/* needed for stat etc */
1085 	orangefs_init_iops(inode);
1086 	unlock_new_inode(inode);
1087 
1088 	gossip_debug(GOSSIP_INODE_DEBUG,
1089 		     "iget handle %pU, fsid %d hash %ld i_ino %lu\n",
1090 		     &ref->khandle,
1091 		     ref->fs_id,
1092 		     hash,
1093 		     inode->i_ino);
1094 
1095 	return inode;
1096 }
1097 
1098 /*
1099  * Allocate an inode for a newly created file and insert it into the inode hash.
1100  */
orangefs_new_inode(struct super_block * sb,struct inode * dir,int mode,dev_t dev,struct orangefs_object_kref * ref)1101 struct inode *orangefs_new_inode(struct super_block *sb, struct inode *dir,
1102 		int mode, dev_t dev, struct orangefs_object_kref *ref)
1103 {
1104 	unsigned long hash = orangefs_handle_hash(ref);
1105 	struct inode *inode;
1106 	int error;
1107 
1108 	gossip_debug(GOSSIP_INODE_DEBUG,
1109 		     "%s:(sb is %p | MAJOR(dev)=%u | MINOR(dev)=%u mode=%o)\n",
1110 		     __func__,
1111 		     sb,
1112 		     MAJOR(dev),
1113 		     MINOR(dev),
1114 		     mode);
1115 
1116 	inode = new_inode(sb);
1117 	if (!inode)
1118 		return ERR_PTR(-ENOMEM);
1119 
1120 	orangefs_set_inode(inode, ref);
1121 	inode->i_ino = hash;	/* needed for stat etc */
1122 
1123 	error = orangefs_inode_getattr(inode, ORANGEFS_GETATTR_NEW);
1124 	if (error)
1125 		goto out_iput;
1126 
1127 	orangefs_init_iops(inode);
1128 	inode->i_rdev = dev;
1129 
1130 	error = insert_inode_locked4(inode, hash, orangefs_test_inode, ref);
1131 	if (error < 0)
1132 		goto out_iput;
1133 
1134 	gossip_debug(GOSSIP_INODE_DEBUG,
1135 		     "Initializing ACL's for inode %pU\n",
1136 		     get_khandle_from_ino(inode));
1137 	orangefs_init_acl(inode, dir);
1138 	return inode;
1139 
1140 out_iput:
1141 	iput(inode);
1142 	return ERR_PTR(error);
1143 }
1144