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 WARN_ON(wlen == 0);
53 bvec_set_page(&bv, page, wlen, off % PAGE_SIZE);
54 iov_iter_bvec(&iter, ITER_SOURCE, &bv, 1, wlen);
55
56 ret = wait_for_direct_io(ORANGEFS_IO_WRITE, inode, &off, &iter, wlen,
57 len, wr, NULL, NULL);
58 if (ret < 0) {
59 SetPageError(page);
60 mapping_set_error(page->mapping, ret);
61 } else {
62 ret = 0;
63 }
64 kfree(detach_page_private(page));
65 return ret;
66 }
67
orangefs_writepage(struct page * page,struct writeback_control * wbc)68 static int orangefs_writepage(struct page *page, struct writeback_control *wbc)
69 {
70 int ret;
71 ret = orangefs_writepage_locked(page, wbc);
72 unlock_page(page);
73 end_page_writeback(page);
74 return ret;
75 }
76
77 struct orangefs_writepages {
78 loff_t off;
79 size_t len;
80 kuid_t uid;
81 kgid_t gid;
82 int maxpages;
83 int npages;
84 struct page **pages;
85 struct bio_vec *bv;
86 };
87
orangefs_writepages_work(struct orangefs_writepages * ow,struct writeback_control * wbc)88 static int orangefs_writepages_work(struct orangefs_writepages *ow,
89 struct writeback_control *wbc)
90 {
91 struct inode *inode = ow->pages[0]->mapping->host;
92 struct orangefs_write_range *wrp, wr;
93 struct iov_iter iter;
94 ssize_t ret;
95 size_t len;
96 loff_t off;
97 int i;
98
99 len = i_size_read(inode);
100
101 for (i = 0; i < ow->npages; i++) {
102 set_page_writeback(ow->pages[i]);
103 bvec_set_page(&ow->bv[i], ow->pages[i],
104 min(page_offset(ow->pages[i]) + PAGE_SIZE,
105 ow->off + ow->len) -
106 max(ow->off, page_offset(ow->pages[i])),
107 i == 0 ? ow->off - page_offset(ow->pages[i]) : 0);
108 }
109 iov_iter_bvec(&iter, ITER_SOURCE, ow->bv, ow->npages, ow->len);
110
111 WARN_ON(ow->off >= len);
112 if (ow->off + ow->len > len)
113 ow->len = len - ow->off;
114
115 off = ow->off;
116 wr.uid = ow->uid;
117 wr.gid = ow->gid;
118 ret = wait_for_direct_io(ORANGEFS_IO_WRITE, inode, &off, &iter, ow->len,
119 0, &wr, NULL, NULL);
120 if (ret < 0) {
121 for (i = 0; i < ow->npages; i++) {
122 SetPageError(ow->pages[i]);
123 mapping_set_error(ow->pages[i]->mapping, ret);
124 if (PagePrivate(ow->pages[i])) {
125 wrp = (struct orangefs_write_range *)
126 page_private(ow->pages[i]);
127 ClearPagePrivate(ow->pages[i]);
128 put_page(ow->pages[i]);
129 kfree(wrp);
130 }
131 end_page_writeback(ow->pages[i]);
132 unlock_page(ow->pages[i]);
133 }
134 } else {
135 ret = 0;
136 for (i = 0; i < ow->npages; i++) {
137 if (PagePrivate(ow->pages[i])) {
138 wrp = (struct orangefs_write_range *)
139 page_private(ow->pages[i]);
140 ClearPagePrivate(ow->pages[i]);
141 put_page(ow->pages[i]);
142 kfree(wrp);
143 }
144 end_page_writeback(ow->pages[i]);
145 unlock_page(ow->pages[i]);
146 }
147 }
148 return ret;
149 }
150
orangefs_writepages_callback(struct folio * folio,struct writeback_control * wbc,void * data)151 static int orangefs_writepages_callback(struct folio *folio,
152 struct writeback_control *wbc, void *data)
153 {
154 struct orangefs_writepages *ow = data;
155 struct orangefs_write_range *wr = folio->private;
156 int ret;
157
158 if (!wr) {
159 folio_unlock(folio);
160 /* It's not private so there's nothing to write, right? */
161 printk("writepages_callback not private!\n");
162 BUG();
163 return 0;
164 }
165
166 ret = -1;
167 if (ow->npages == 0) {
168 ow->off = wr->pos;
169 ow->len = wr->len;
170 ow->uid = wr->uid;
171 ow->gid = wr->gid;
172 ow->pages[ow->npages++] = &folio->page;
173 ret = 0;
174 goto done;
175 }
176 if (!uid_eq(ow->uid, wr->uid) || !gid_eq(ow->gid, wr->gid)) {
177 orangefs_writepages_work(ow, wbc);
178 ow->npages = 0;
179 ret = -1;
180 goto done;
181 }
182 if (ow->off + ow->len == wr->pos) {
183 ow->len += wr->len;
184 ow->pages[ow->npages++] = &folio->page;
185 ret = 0;
186 goto done;
187 }
188 done:
189 if (ret == -1) {
190 if (ow->npages) {
191 orangefs_writepages_work(ow, wbc);
192 ow->npages = 0;
193 }
194 ret = orangefs_writepage_locked(&folio->page, wbc);
195 mapping_set_error(folio->mapping, ret);
196 folio_unlock(folio);
197 folio_end_writeback(folio);
198 } else {
199 if (ow->npages == ow->maxpages) {
200 orangefs_writepages_work(ow, wbc);
201 ow->npages = 0;
202 }
203 }
204 return ret;
205 }
206
orangefs_writepages(struct address_space * mapping,struct writeback_control * wbc)207 static int orangefs_writepages(struct address_space *mapping,
208 struct writeback_control *wbc)
209 {
210 struct orangefs_writepages *ow;
211 struct blk_plug plug;
212 int ret;
213 ow = kzalloc(sizeof(struct orangefs_writepages), GFP_KERNEL);
214 if (!ow)
215 return -ENOMEM;
216 ow->maxpages = orangefs_bufmap_size_query()/PAGE_SIZE;
217 ow->pages = kcalloc(ow->maxpages, sizeof(struct page *), GFP_KERNEL);
218 if (!ow->pages) {
219 kfree(ow);
220 return -ENOMEM;
221 }
222 ow->bv = kcalloc(ow->maxpages, sizeof(struct bio_vec), GFP_KERNEL);
223 if (!ow->bv) {
224 kfree(ow->pages);
225 kfree(ow);
226 return -ENOMEM;
227 }
228 blk_start_plug(&plug);
229 ret = write_cache_pages(mapping, wbc, orangefs_writepages_callback, ow);
230 if (ow->npages)
231 ret = orangefs_writepages_work(ow, wbc);
232 blk_finish_plug(&plug);
233 kfree(ow->pages);
234 kfree(ow->bv);
235 kfree(ow);
236 return ret;
237 }
238
239 static int orangefs_launder_folio(struct folio *);
240
orangefs_readahead(struct readahead_control * rac)241 static void orangefs_readahead(struct readahead_control *rac)
242 {
243 loff_t offset;
244 struct iov_iter iter;
245 struct inode *inode = rac->mapping->host;
246 struct xarray *i_pages;
247 struct folio *folio;
248 loff_t new_start = readahead_pos(rac);
249 int ret;
250 size_t new_len = 0;
251
252 loff_t bytes_remaining = inode->i_size - readahead_pos(rac);
253 loff_t pages_remaining = bytes_remaining / PAGE_SIZE;
254
255 if (pages_remaining >= 1024)
256 new_len = 4194304;
257 else if (pages_remaining > readahead_count(rac))
258 new_len = bytes_remaining;
259
260 if (new_len)
261 readahead_expand(rac, new_start, new_len);
262
263 offset = readahead_pos(rac);
264 i_pages = &rac->mapping->i_pages;
265
266 iov_iter_xarray(&iter, ITER_DEST, i_pages, offset, readahead_length(rac));
267
268 /* read in the pages. */
269 if ((ret = wait_for_direct_io(ORANGEFS_IO_READ, inode,
270 &offset, &iter, readahead_length(rac),
271 inode->i_size, NULL, NULL, rac->file)) < 0)
272 gossip_debug(GOSSIP_FILE_DEBUG,
273 "%s: wait_for_direct_io failed. \n", __func__);
274 else
275 ret = 0;
276
277 /* clean up. */
278 while ((folio = readahead_folio(rac))) {
279 if (!ret)
280 folio_mark_uptodate(folio);
281 folio_unlock(folio);
282 }
283 }
284
orangefs_read_folio(struct file * file,struct folio * folio)285 static int orangefs_read_folio(struct file *file, struct folio *folio)
286 {
287 struct inode *inode = folio->mapping->host;
288 struct iov_iter iter;
289 struct bio_vec bv;
290 ssize_t ret;
291 loff_t off; /* offset of this folio in the file */
292
293 if (folio_test_dirty(folio))
294 orangefs_launder_folio(folio);
295
296 off = folio_pos(folio);
297 bvec_set_folio(&bv, folio, folio_size(folio), 0);
298 iov_iter_bvec(&iter, ITER_DEST, &bv, 1, folio_size(folio));
299
300 ret = wait_for_direct_io(ORANGEFS_IO_READ, inode, &off, &iter,
301 folio_size(folio), inode->i_size, NULL, NULL, file);
302 /* this will only zero remaining unread portions of the folio data */
303 iov_iter_zero(~0U, &iter);
304 /* takes care of potential aliasing */
305 flush_dcache_folio(folio);
306 if (ret < 0) {
307 folio_set_error(folio);
308 } else {
309 folio_mark_uptodate(folio);
310 ret = 0;
311 }
312 /* unlock the folio after the ->read_folio() routine completes */
313 folio_unlock(folio);
314 return ret;
315 }
316
orangefs_write_begin(struct file * file,struct address_space * mapping,loff_t pos,unsigned len,struct page ** pagep,void ** fsdata)317 static int orangefs_write_begin(struct file *file,
318 struct address_space *mapping, loff_t pos, unsigned len,
319 struct page **pagep, void **fsdata)
320 {
321 struct orangefs_write_range *wr;
322 struct folio *folio;
323 struct page *page;
324 pgoff_t index;
325 int ret;
326
327 index = pos >> PAGE_SHIFT;
328
329 page = grab_cache_page_write_begin(mapping, index);
330 if (!page)
331 return -ENOMEM;
332
333 *pagep = page;
334 folio = page_folio(page);
335
336 if (folio_test_dirty(folio) && !folio_test_private(folio)) {
337 /*
338 * Should be impossible. If it happens, launder the page
339 * since we don't know what's dirty. This will WARN in
340 * orangefs_writepage_locked.
341 */
342 ret = orangefs_launder_folio(folio);
343 if (ret)
344 return ret;
345 }
346 if (folio_test_private(folio)) {
347 struct orangefs_write_range *wr;
348 wr = folio_get_private(folio);
349 if (wr->pos + wr->len == pos &&
350 uid_eq(wr->uid, current_fsuid()) &&
351 gid_eq(wr->gid, current_fsgid())) {
352 wr->len += len;
353 goto okay;
354 } else {
355 ret = orangefs_launder_folio(folio);
356 if (ret)
357 return ret;
358 }
359 }
360
361 wr = kmalloc(sizeof *wr, GFP_KERNEL);
362 if (!wr)
363 return -ENOMEM;
364
365 wr->pos = pos;
366 wr->len = len;
367 wr->uid = current_fsuid();
368 wr->gid = current_fsgid();
369 folio_attach_private(folio, wr);
370 okay:
371 return 0;
372 }
373
orangefs_write_end(struct file * file,struct address_space * mapping,loff_t pos,unsigned len,unsigned copied,struct page * page,void * fsdata)374 static int orangefs_write_end(struct file *file, struct address_space *mapping,
375 loff_t pos, unsigned len, unsigned copied, struct page *page, void *fsdata)
376 {
377 struct inode *inode = page->mapping->host;
378 loff_t last_pos = pos + copied;
379
380 /*
381 * No need to use i_size_read() here, the i_size
382 * cannot change under us because we hold the i_mutex.
383 */
384 if (last_pos > inode->i_size)
385 i_size_write(inode, last_pos);
386
387 /* zero the stale part of the page if we did a short copy */
388 if (!PageUptodate(page)) {
389 unsigned from = pos & (PAGE_SIZE - 1);
390 if (copied < len) {
391 zero_user(page, from + copied, len - copied);
392 }
393 /* Set fully written pages uptodate. */
394 if (pos == page_offset(page) &&
395 (len == PAGE_SIZE || pos + len == inode->i_size)) {
396 zero_user_segment(page, from + copied, PAGE_SIZE);
397 SetPageUptodate(page);
398 }
399 }
400
401 set_page_dirty(page);
402 unlock_page(page);
403 put_page(page);
404
405 mark_inode_dirty_sync(file_inode(file));
406 return copied;
407 }
408
orangefs_invalidate_folio(struct folio * folio,size_t offset,size_t length)409 static void orangefs_invalidate_folio(struct folio *folio,
410 size_t offset, size_t length)
411 {
412 struct orangefs_write_range *wr = folio_get_private(folio);
413
414 if (offset == 0 && length == PAGE_SIZE) {
415 kfree(folio_detach_private(folio));
416 return;
417 /* write range entirely within invalidate range (or equal) */
418 } else if (folio_pos(folio) + offset <= wr->pos &&
419 wr->pos + wr->len <= folio_pos(folio) + offset + length) {
420 kfree(folio_detach_private(folio));
421 /* XXX is this right? only caller in fs */
422 folio_cancel_dirty(folio);
423 return;
424 /* invalidate range chops off end of write range */
425 } else if (wr->pos < folio_pos(folio) + offset &&
426 wr->pos + wr->len <= folio_pos(folio) + offset + length &&
427 folio_pos(folio) + offset < wr->pos + wr->len) {
428 size_t x;
429 x = wr->pos + wr->len - (folio_pos(folio) + offset);
430 WARN_ON(x > wr->len);
431 wr->len -= x;
432 wr->uid = current_fsuid();
433 wr->gid = current_fsgid();
434 /* invalidate range chops off beginning of write range */
435 } else if (folio_pos(folio) + offset <= wr->pos &&
436 folio_pos(folio) + offset + length < wr->pos + wr->len &&
437 wr->pos < folio_pos(folio) + offset + length) {
438 size_t x;
439 x = folio_pos(folio) + offset + length - wr->pos;
440 WARN_ON(x > wr->len);
441 wr->pos += x;
442 wr->len -= x;
443 wr->uid = current_fsuid();
444 wr->gid = current_fsgid();
445 /* invalidate range entirely within write range (punch hole) */
446 } else if (wr->pos < folio_pos(folio) + offset &&
447 folio_pos(folio) + offset + length < wr->pos + wr->len) {
448 /* XXX what do we do here... should not WARN_ON */
449 WARN_ON(1);
450 /* punch hole */
451 /*
452 * should we just ignore this and write it out anyway?
453 * it hardly makes sense
454 */
455 return;
456 /* non-overlapping ranges */
457 } else {
458 /* WARN if they do overlap */
459 if (!((folio_pos(folio) + offset + length <= wr->pos) ^
460 (wr->pos + wr->len <= folio_pos(folio) + offset))) {
461 WARN_ON(1);
462 printk("invalidate range offset %llu length %zu\n",
463 folio_pos(folio) + offset, length);
464 printk("write range offset %llu length %zu\n",
465 wr->pos, wr->len);
466 }
467 return;
468 }
469
470 /*
471 * Above there are returns where wr is freed or where we WARN.
472 * Thus the following runs if wr was modified above.
473 */
474
475 orangefs_launder_folio(folio);
476 }
477
orangefs_release_folio(struct folio * folio,gfp_t foo)478 static bool orangefs_release_folio(struct folio *folio, gfp_t foo)
479 {
480 return !folio_test_private(folio);
481 }
482
orangefs_free_folio(struct folio * folio)483 static void orangefs_free_folio(struct folio *folio)
484 {
485 kfree(folio_detach_private(folio));
486 }
487
orangefs_launder_folio(struct folio * folio)488 static int orangefs_launder_folio(struct folio *folio)
489 {
490 int r = 0;
491 struct writeback_control wbc = {
492 .sync_mode = WB_SYNC_ALL,
493 .nr_to_write = 0,
494 };
495 folio_wait_writeback(folio);
496 if (folio_clear_dirty_for_io(folio)) {
497 r = orangefs_writepage_locked(&folio->page, &wbc);
498 folio_end_writeback(folio);
499 }
500 return r;
501 }
502
orangefs_direct_IO(struct kiocb * iocb,struct iov_iter * iter)503 static ssize_t orangefs_direct_IO(struct kiocb *iocb,
504 struct iov_iter *iter)
505 {
506 /*
507 * Comment from original do_readv_writev:
508 * Common entry point for read/write/readv/writev
509 * This function will dispatch it to either the direct I/O
510 * or buffered I/O path depending on the mount options and/or
511 * augmented/extended metadata attached to the file.
512 * Note: File extended attributes override any mount options.
513 */
514 struct file *file = iocb->ki_filp;
515 loff_t pos = iocb->ki_pos;
516 enum ORANGEFS_io_type type = iov_iter_rw(iter) == WRITE ?
517 ORANGEFS_IO_WRITE : ORANGEFS_IO_READ;
518 loff_t *offset = &pos;
519 struct inode *inode = file->f_mapping->host;
520 struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
521 struct orangefs_khandle *handle = &orangefs_inode->refn.khandle;
522 size_t count = iov_iter_count(iter);
523 ssize_t total_count = 0;
524 ssize_t ret = -EINVAL;
525
526 gossip_debug(GOSSIP_FILE_DEBUG,
527 "%s-BEGIN(%pU): count(%d) after estimate_max_iovecs.\n",
528 __func__,
529 handle,
530 (int)count);
531
532 if (type == ORANGEFS_IO_WRITE) {
533 gossip_debug(GOSSIP_FILE_DEBUG,
534 "%s(%pU): proceeding with offset : %llu, "
535 "size %d\n",
536 __func__,
537 handle,
538 llu(*offset),
539 (int)count);
540 }
541
542 if (count == 0) {
543 ret = 0;
544 goto out;
545 }
546
547 while (iov_iter_count(iter)) {
548 size_t each_count = iov_iter_count(iter);
549 size_t amt_complete;
550
551 /* how much to transfer in this loop iteration */
552 if (each_count > orangefs_bufmap_size_query())
553 each_count = orangefs_bufmap_size_query();
554
555 gossip_debug(GOSSIP_FILE_DEBUG,
556 "%s(%pU): size of each_count(%d)\n",
557 __func__,
558 handle,
559 (int)each_count);
560 gossip_debug(GOSSIP_FILE_DEBUG,
561 "%s(%pU): BEFORE wait_for_io: offset is %d\n",
562 __func__,
563 handle,
564 (int)*offset);
565
566 ret = wait_for_direct_io(type, inode, offset, iter,
567 each_count, 0, NULL, NULL, file);
568 gossip_debug(GOSSIP_FILE_DEBUG,
569 "%s(%pU): return from wait_for_io:%d\n",
570 __func__,
571 handle,
572 (int)ret);
573
574 if (ret < 0)
575 goto out;
576
577 *offset += ret;
578 total_count += ret;
579 amt_complete = ret;
580
581 gossip_debug(GOSSIP_FILE_DEBUG,
582 "%s(%pU): AFTER wait_for_io: offset is %d\n",
583 __func__,
584 handle,
585 (int)*offset);
586
587 /*
588 * if we got a short I/O operations,
589 * fall out and return what we got so far
590 */
591 if (amt_complete < each_count)
592 break;
593 } /*end while */
594
595 out:
596 if (total_count > 0)
597 ret = total_count;
598 if (ret > 0) {
599 if (type == ORANGEFS_IO_READ) {
600 file_accessed(file);
601 } else {
602 file_update_time(file);
603 if (*offset > i_size_read(inode))
604 i_size_write(inode, *offset);
605 }
606 }
607
608 gossip_debug(GOSSIP_FILE_DEBUG,
609 "%s(%pU): Value(%d) returned.\n",
610 __func__,
611 handle,
612 (int)ret);
613
614 return ret;
615 }
616
617 /** ORANGEFS2 implementation of address space operations */
618 static const struct address_space_operations orangefs_address_operations = {
619 .writepage = orangefs_writepage,
620 .readahead = orangefs_readahead,
621 .read_folio = orangefs_read_folio,
622 .writepages = orangefs_writepages,
623 .dirty_folio = filemap_dirty_folio,
624 .write_begin = orangefs_write_begin,
625 .write_end = orangefs_write_end,
626 .invalidate_folio = orangefs_invalidate_folio,
627 .release_folio = orangefs_release_folio,
628 .free_folio = orangefs_free_folio,
629 .launder_folio = orangefs_launder_folio,
630 .direct_IO = orangefs_direct_IO,
631 };
632
orangefs_page_mkwrite(struct vm_fault * vmf)633 vm_fault_t orangefs_page_mkwrite(struct vm_fault *vmf)
634 {
635 struct folio *folio = page_folio(vmf->page);
636 struct inode *inode = file_inode(vmf->vma->vm_file);
637 struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
638 unsigned long *bitlock = &orangefs_inode->bitlock;
639 vm_fault_t ret;
640 struct orangefs_write_range *wr;
641
642 sb_start_pagefault(inode->i_sb);
643
644 if (wait_on_bit(bitlock, 1, TASK_KILLABLE)) {
645 ret = VM_FAULT_RETRY;
646 goto out;
647 }
648
649 folio_lock(folio);
650 if (folio_test_dirty(folio) && !folio_test_private(folio)) {
651 /*
652 * Should be impossible. If it happens, launder the folio
653 * since we don't know what's dirty. This will WARN in
654 * orangefs_writepage_locked.
655 */
656 if (orangefs_launder_folio(folio)) {
657 ret = VM_FAULT_LOCKED|VM_FAULT_RETRY;
658 goto out;
659 }
660 }
661 if (folio_test_private(folio)) {
662 wr = folio_get_private(folio);
663 if (uid_eq(wr->uid, current_fsuid()) &&
664 gid_eq(wr->gid, current_fsgid())) {
665 wr->pos = page_offset(vmf->page);
666 wr->len = PAGE_SIZE;
667 goto okay;
668 } else {
669 if (orangefs_launder_folio(folio)) {
670 ret = VM_FAULT_LOCKED|VM_FAULT_RETRY;
671 goto out;
672 }
673 }
674 }
675 wr = kmalloc(sizeof *wr, GFP_KERNEL);
676 if (!wr) {
677 ret = VM_FAULT_LOCKED|VM_FAULT_RETRY;
678 goto out;
679 }
680 wr->pos = page_offset(vmf->page);
681 wr->len = PAGE_SIZE;
682 wr->uid = current_fsuid();
683 wr->gid = current_fsgid();
684 folio_attach_private(folio, wr);
685 okay:
686
687 file_update_time(vmf->vma->vm_file);
688 if (folio->mapping != inode->i_mapping) {
689 folio_unlock(folio);
690 ret = VM_FAULT_LOCKED|VM_FAULT_NOPAGE;
691 goto out;
692 }
693
694 /*
695 * We mark the folio dirty already here so that when freeze is in
696 * progress, we are guaranteed that writeback during freezing will
697 * see the dirty folio and writeprotect it again.
698 */
699 folio_mark_dirty(folio);
700 folio_wait_stable(folio);
701 ret = VM_FAULT_LOCKED;
702 out:
703 sb_end_pagefault(inode->i_sb);
704 return ret;
705 }
706
orangefs_setattr_size(struct inode * inode,struct iattr * iattr)707 static int orangefs_setattr_size(struct inode *inode, struct iattr *iattr)
708 {
709 struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
710 struct orangefs_kernel_op_s *new_op;
711 loff_t orig_size;
712 int ret = -EINVAL;
713
714 gossip_debug(GOSSIP_INODE_DEBUG,
715 "%s: %pU: Handle is %pU | fs_id %d | size is %llu\n",
716 __func__,
717 get_khandle_from_ino(inode),
718 &orangefs_inode->refn.khandle,
719 orangefs_inode->refn.fs_id,
720 iattr->ia_size);
721
722 /* Ensure that we have a up to date size, so we know if it changed. */
723 ret = orangefs_inode_getattr(inode, ORANGEFS_GETATTR_SIZE);
724 if (ret == -ESTALE)
725 ret = -EIO;
726 if (ret) {
727 gossip_err("%s: orangefs_inode_getattr failed, ret:%d:.\n",
728 __func__, ret);
729 return ret;
730 }
731 orig_size = i_size_read(inode);
732
733 /* This is truncate_setsize in a different order. */
734 truncate_pagecache(inode, iattr->ia_size);
735 i_size_write(inode, iattr->ia_size);
736 if (iattr->ia_size > orig_size)
737 pagecache_isize_extended(inode, orig_size, iattr->ia_size);
738
739 new_op = op_alloc(ORANGEFS_VFS_OP_TRUNCATE);
740 if (!new_op)
741 return -ENOMEM;
742
743 new_op->upcall.req.truncate.refn = orangefs_inode->refn;
744 new_op->upcall.req.truncate.size = (__s64) iattr->ia_size;
745
746 ret = service_operation(new_op,
747 __func__,
748 get_interruptible_flag(inode));
749
750 /*
751 * the truncate has no downcall members to retrieve, but
752 * the status value tells us if it went through ok or not
753 */
754 gossip_debug(GOSSIP_INODE_DEBUG, "%s: ret:%d:\n", __func__, ret);
755
756 op_release(new_op);
757
758 if (ret != 0)
759 return ret;
760
761 if (orig_size != i_size_read(inode))
762 iattr->ia_valid |= ATTR_CTIME | ATTR_MTIME;
763
764 return ret;
765 }
766
__orangefs_setattr(struct inode * inode,struct iattr * iattr)767 int __orangefs_setattr(struct inode *inode, struct iattr *iattr)
768 {
769 int ret;
770
771 if (iattr->ia_valid & ATTR_MODE) {
772 if (iattr->ia_mode & (S_ISVTX)) {
773 if (is_root_handle(inode)) {
774 /*
775 * allow sticky bit to be set on root (since
776 * it shows up that way by default anyhow),
777 * but don't show it to the server
778 */
779 iattr->ia_mode -= S_ISVTX;
780 } else {
781 gossip_debug(GOSSIP_UTILS_DEBUG,
782 "User attempted to set sticky bit on non-root directory; returning EINVAL.\n");
783 ret = -EINVAL;
784 goto out;
785 }
786 }
787 if (iattr->ia_mode & (S_ISUID)) {
788 gossip_debug(GOSSIP_UTILS_DEBUG,
789 "Attempting to set setuid bit (not supported); returning EINVAL.\n");
790 ret = -EINVAL;
791 goto out;
792 }
793 }
794
795 if (iattr->ia_valid & ATTR_SIZE) {
796 ret = orangefs_setattr_size(inode, iattr);
797 if (ret)
798 goto out;
799 }
800
801 again:
802 spin_lock(&inode->i_lock);
803 if (ORANGEFS_I(inode)->attr_valid) {
804 if (uid_eq(ORANGEFS_I(inode)->attr_uid, current_fsuid()) &&
805 gid_eq(ORANGEFS_I(inode)->attr_gid, current_fsgid())) {
806 ORANGEFS_I(inode)->attr_valid = iattr->ia_valid;
807 } else {
808 spin_unlock(&inode->i_lock);
809 write_inode_now(inode, 1);
810 goto again;
811 }
812 } else {
813 ORANGEFS_I(inode)->attr_valid = iattr->ia_valid;
814 ORANGEFS_I(inode)->attr_uid = current_fsuid();
815 ORANGEFS_I(inode)->attr_gid = current_fsgid();
816 }
817 setattr_copy(&nop_mnt_idmap, inode, iattr);
818 spin_unlock(&inode->i_lock);
819 mark_inode_dirty(inode);
820
821 ret = 0;
822 out:
823 return ret;
824 }
825
__orangefs_setattr_mode(struct dentry * dentry,struct iattr * iattr)826 int __orangefs_setattr_mode(struct dentry *dentry, struct iattr *iattr)
827 {
828 int ret;
829 struct inode *inode = d_inode(dentry);
830
831 ret = __orangefs_setattr(inode, iattr);
832 /* change mode on a file that has ACLs */
833 if (!ret && (iattr->ia_valid & ATTR_MODE))
834 ret = posix_acl_chmod(&nop_mnt_idmap, dentry, inode->i_mode);
835 return ret;
836 }
837
838 /*
839 * Change attributes of an object referenced by dentry.
840 */
orangefs_setattr(struct mnt_idmap * idmap,struct dentry * dentry,struct iattr * iattr)841 int orangefs_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
842 struct iattr *iattr)
843 {
844 int ret;
845 gossip_debug(GOSSIP_INODE_DEBUG, "__orangefs_setattr: called on %pd\n",
846 dentry);
847 ret = setattr_prepare(&nop_mnt_idmap, dentry, iattr);
848 if (ret)
849 goto out;
850 ret = __orangefs_setattr_mode(dentry, iattr);
851 sync_inode_metadata(d_inode(dentry), 1);
852 out:
853 gossip_debug(GOSSIP_INODE_DEBUG, "orangefs_setattr: returning %d\n",
854 ret);
855 return ret;
856 }
857
858 /*
859 * Obtain attributes of an object given a dentry
860 */
orangefs_getattr(struct mnt_idmap * idmap,const struct path * path,struct kstat * stat,u32 request_mask,unsigned int flags)861 int orangefs_getattr(struct mnt_idmap *idmap, const struct path *path,
862 struct kstat *stat, u32 request_mask, unsigned int flags)
863 {
864 int ret;
865 struct inode *inode = path->dentry->d_inode;
866
867 gossip_debug(GOSSIP_INODE_DEBUG,
868 "orangefs_getattr: called on %pd mask %u\n",
869 path->dentry, request_mask);
870
871 ret = orangefs_inode_getattr(inode,
872 request_mask & STATX_SIZE ? ORANGEFS_GETATTR_SIZE : 0);
873 if (ret == 0) {
874 generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat);
875
876 /* override block size reported to stat */
877 if (!(request_mask & STATX_SIZE))
878 stat->result_mask &= ~STATX_SIZE;
879
880 generic_fill_statx_attr(inode, stat);
881 }
882 return ret;
883 }
884
orangefs_permission(struct mnt_idmap * idmap,struct inode * inode,int mask)885 int orangefs_permission(struct mnt_idmap *idmap,
886 struct inode *inode, int mask)
887 {
888 int ret;
889
890 if (mask & MAY_NOT_BLOCK)
891 return -ECHILD;
892
893 gossip_debug(GOSSIP_INODE_DEBUG, "%s: refreshing\n", __func__);
894
895 /* Make sure the permission (and other common attrs) are up to date. */
896 ret = orangefs_inode_getattr(inode, 0);
897 if (ret < 0)
898 return ret;
899
900 return generic_permission(&nop_mnt_idmap, inode, mask);
901 }
902
orangefs_update_time(struct inode * inode,int flags)903 int orangefs_update_time(struct inode *inode, int flags)
904 {
905 struct iattr iattr;
906
907 gossip_debug(GOSSIP_INODE_DEBUG, "orangefs_update_time: %pU\n",
908 get_khandle_from_ino(inode));
909 flags = generic_update_time(inode, flags);
910 memset(&iattr, 0, sizeof iattr);
911 if (flags & S_ATIME)
912 iattr.ia_valid |= ATTR_ATIME;
913 if (flags & S_CTIME)
914 iattr.ia_valid |= ATTR_CTIME;
915 if (flags & S_MTIME)
916 iattr.ia_valid |= ATTR_MTIME;
917 return __orangefs_setattr(inode, &iattr);
918 }
919
orangefs_fileattr_get(struct dentry * dentry,struct fileattr * fa)920 static int orangefs_fileattr_get(struct dentry *dentry, struct fileattr *fa)
921 {
922 u64 val = 0;
923 int ret;
924
925 gossip_debug(GOSSIP_FILE_DEBUG, "%s: called on %pd\n", __func__,
926 dentry);
927
928 ret = orangefs_inode_getxattr(d_inode(dentry),
929 "user.pvfs2.meta_hint",
930 &val, sizeof(val));
931 if (ret < 0 && ret != -ENODATA)
932 return ret;
933
934 gossip_debug(GOSSIP_FILE_DEBUG, "%s: flags=%u\n", __func__, (u32) val);
935
936 fileattr_fill_flags(fa, val);
937 return 0;
938 }
939
orangefs_fileattr_set(struct mnt_idmap * idmap,struct dentry * dentry,struct fileattr * fa)940 static int orangefs_fileattr_set(struct mnt_idmap *idmap,
941 struct dentry *dentry, struct fileattr *fa)
942 {
943 u64 val = 0;
944
945 gossip_debug(GOSSIP_FILE_DEBUG, "%s: called on %pd\n", __func__,
946 dentry);
947 /*
948 * ORANGEFS_MIRROR_FL is set internally when the mirroring mode is
949 * turned on for a file. The user is not allowed to turn on this bit,
950 * but the bit is present if the user first gets the flags and then
951 * updates the flags with some new settings. So, we ignore it in the
952 * following edit. bligon.
953 */
954 if (fileattr_has_fsx(fa) ||
955 (fa->flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | FS_NOATIME_FL | ORANGEFS_MIRROR_FL))) {
956 gossip_err("%s: only supports setting one of FS_IMMUTABLE_FL|FS_APPEND_FL|FS_NOATIME_FL\n",
957 __func__);
958 return -EOPNOTSUPP;
959 }
960 val = fa->flags;
961 gossip_debug(GOSSIP_FILE_DEBUG, "%s: flags=%u\n", __func__, (u32) val);
962 return orangefs_inode_setxattr(d_inode(dentry),
963 "user.pvfs2.meta_hint",
964 &val, sizeof(val), 0);
965 }
966
967 /* ORANGEFS2 implementation of VFS inode operations for files */
968 static const struct inode_operations orangefs_file_inode_operations = {
969 .get_inode_acl = orangefs_get_acl,
970 .set_acl = orangefs_set_acl,
971 .setattr = orangefs_setattr,
972 .getattr = orangefs_getattr,
973 .listxattr = orangefs_listxattr,
974 .permission = orangefs_permission,
975 .update_time = orangefs_update_time,
976 .fileattr_get = orangefs_fileattr_get,
977 .fileattr_set = orangefs_fileattr_set,
978 };
979
orangefs_init_iops(struct inode * inode)980 static int orangefs_init_iops(struct inode *inode)
981 {
982 inode->i_mapping->a_ops = &orangefs_address_operations;
983
984 switch (inode->i_mode & S_IFMT) {
985 case S_IFREG:
986 inode->i_op = &orangefs_file_inode_operations;
987 inode->i_fop = &orangefs_file_operations;
988 break;
989 case S_IFLNK:
990 inode->i_op = &orangefs_symlink_inode_operations;
991 break;
992 case S_IFDIR:
993 inode->i_op = &orangefs_dir_inode_operations;
994 inode->i_fop = &orangefs_dir_operations;
995 break;
996 default:
997 gossip_debug(GOSSIP_INODE_DEBUG,
998 "%s: unsupported mode\n",
999 __func__);
1000 return -EINVAL;
1001 }
1002
1003 return 0;
1004 }
1005
1006 /*
1007 * Given an ORANGEFS object identifier (fsid, handle), convert it into
1008 * a ino_t type that will be used as a hash-index from where the handle will
1009 * be searched for in the VFS hash table of inodes.
1010 */
orangefs_handle_hash(struct orangefs_object_kref * ref)1011 static inline ino_t orangefs_handle_hash(struct orangefs_object_kref *ref)
1012 {
1013 if (!ref)
1014 return 0;
1015 return orangefs_khandle_to_ino(&(ref->khandle));
1016 }
1017
1018 /*
1019 * Called to set up an inode from iget5_locked.
1020 */
orangefs_set_inode(struct inode * inode,void * data)1021 static int orangefs_set_inode(struct inode *inode, void *data)
1022 {
1023 struct orangefs_object_kref *ref = (struct orangefs_object_kref *) data;
1024 ORANGEFS_I(inode)->refn.fs_id = ref->fs_id;
1025 ORANGEFS_I(inode)->refn.khandle = ref->khandle;
1026 ORANGEFS_I(inode)->attr_valid = 0;
1027 hash_init(ORANGEFS_I(inode)->xattr_cache);
1028 ORANGEFS_I(inode)->mapping_time = jiffies - 1;
1029 ORANGEFS_I(inode)->bitlock = 0;
1030 return 0;
1031 }
1032
1033 /*
1034 * Called to determine if handles match.
1035 */
orangefs_test_inode(struct inode * inode,void * data)1036 static int orangefs_test_inode(struct inode *inode, void *data)
1037 {
1038 struct orangefs_object_kref *ref = (struct orangefs_object_kref *) data;
1039 struct orangefs_inode_s *orangefs_inode = NULL;
1040
1041 orangefs_inode = ORANGEFS_I(inode);
1042 /* test handles and fs_ids... */
1043 return (!ORANGEFS_khandle_cmp(&(orangefs_inode->refn.khandle),
1044 &(ref->khandle)) &&
1045 orangefs_inode->refn.fs_id == ref->fs_id);
1046 }
1047
1048 /*
1049 * Front-end to lookup the inode-cache maintained by the VFS using the ORANGEFS
1050 * file handle.
1051 *
1052 * @sb: the file system super block instance.
1053 * @ref: The ORANGEFS object for which we are trying to locate an inode.
1054 */
orangefs_iget(struct super_block * sb,struct orangefs_object_kref * ref)1055 struct inode *orangefs_iget(struct super_block *sb,
1056 struct orangefs_object_kref *ref)
1057 {
1058 struct inode *inode = NULL;
1059 unsigned long hash;
1060 int error;
1061
1062 hash = orangefs_handle_hash(ref);
1063 inode = iget5_locked(sb,
1064 hash,
1065 orangefs_test_inode,
1066 orangefs_set_inode,
1067 ref);
1068
1069 if (!inode)
1070 return ERR_PTR(-ENOMEM);
1071
1072 if (!(inode->i_state & I_NEW))
1073 return inode;
1074
1075 error = orangefs_inode_getattr(inode, ORANGEFS_GETATTR_NEW);
1076 if (error) {
1077 iget_failed(inode);
1078 return ERR_PTR(error);
1079 }
1080
1081 inode->i_ino = hash; /* needed for stat etc */
1082 orangefs_init_iops(inode);
1083 unlock_new_inode(inode);
1084
1085 gossip_debug(GOSSIP_INODE_DEBUG,
1086 "iget handle %pU, fsid %d hash %ld i_ino %lu\n",
1087 &ref->khandle,
1088 ref->fs_id,
1089 hash,
1090 inode->i_ino);
1091
1092 return inode;
1093 }
1094
1095 /*
1096 * Allocate an inode for a newly created file and insert it into the inode hash.
1097 */
orangefs_new_inode(struct super_block * sb,struct inode * dir,umode_t mode,dev_t dev,struct orangefs_object_kref * ref)1098 struct inode *orangefs_new_inode(struct super_block *sb, struct inode *dir,
1099 umode_t mode, dev_t dev, struct orangefs_object_kref *ref)
1100 {
1101 struct posix_acl *acl = NULL, *default_acl = NULL;
1102 unsigned long hash = orangefs_handle_hash(ref);
1103 struct inode *inode;
1104 int error;
1105
1106 gossip_debug(GOSSIP_INODE_DEBUG,
1107 "%s:(sb is %p | MAJOR(dev)=%u | MINOR(dev)=%u mode=%o)\n",
1108 __func__,
1109 sb,
1110 MAJOR(dev),
1111 MINOR(dev),
1112 mode);
1113
1114 inode = new_inode(sb);
1115 if (!inode)
1116 return ERR_PTR(-ENOMEM);
1117
1118 error = posix_acl_create(dir, &mode, &default_acl, &acl);
1119 if (error)
1120 goto out_iput;
1121
1122 orangefs_set_inode(inode, ref);
1123 inode->i_ino = hash; /* needed for stat etc */
1124
1125 error = orangefs_inode_getattr(inode, ORANGEFS_GETATTR_NEW);
1126 if (error)
1127 goto out_iput;
1128
1129 orangefs_init_iops(inode);
1130 inode->i_rdev = dev;
1131
1132 if (default_acl) {
1133 error = __orangefs_set_acl(inode, default_acl,
1134 ACL_TYPE_DEFAULT);
1135 if (error)
1136 goto out_iput;
1137 }
1138
1139 if (acl) {
1140 error = __orangefs_set_acl(inode, acl, ACL_TYPE_ACCESS);
1141 if (error)
1142 goto out_iput;
1143 }
1144
1145 error = insert_inode_locked4(inode, hash, orangefs_test_inode, ref);
1146 if (error < 0)
1147 goto out_iput;
1148
1149 gossip_debug(GOSSIP_INODE_DEBUG,
1150 "Initializing ACL's for inode %pU\n",
1151 get_khandle_from_ino(inode));
1152 if (mode != inode->i_mode) {
1153 struct iattr iattr = {
1154 .ia_mode = mode,
1155 .ia_valid = ATTR_MODE,
1156 };
1157 inode->i_mode = mode;
1158 __orangefs_setattr(inode, &iattr);
1159 __posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
1160 }
1161 posix_acl_release(acl);
1162 posix_acl_release(default_acl);
1163 return inode;
1164
1165 out_iput:
1166 iput(inode);
1167 posix_acl_release(acl);
1168 posix_acl_release(default_acl);
1169 return ERR_PTR(error);
1170 }
1171