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, ITER_SOURCE, &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, ITER_SOURCE, 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, ITER_DEST, 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, ITER_DEST, &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 folio 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 ret = 0;
319 }
320 /* unlock the folio after the ->read_folio() routine completes */
321 folio_unlock(folio);
322 return ret;
323 }
324
orangefs_write_begin(struct file * file,struct address_space * mapping,loff_t pos,unsigned len,struct page ** pagep,void ** fsdata)325 static int orangefs_write_begin(struct file *file,
326 struct address_space *mapping, loff_t pos, unsigned len,
327 struct page **pagep, void **fsdata)
328 {
329 struct orangefs_write_range *wr;
330 struct folio *folio;
331 struct page *page;
332 pgoff_t index;
333 int ret;
334
335 index = pos >> PAGE_SHIFT;
336
337 page = grab_cache_page_write_begin(mapping, index);
338 if (!page)
339 return -ENOMEM;
340
341 *pagep = page;
342 folio = page_folio(page);
343
344 if (folio_test_dirty(folio) && !folio_test_private(folio)) {
345 /*
346 * Should be impossible. If it happens, launder the page
347 * since we don't know what's dirty. This will WARN in
348 * orangefs_writepage_locked.
349 */
350 ret = orangefs_launder_folio(folio);
351 if (ret)
352 return ret;
353 }
354 if (folio_test_private(folio)) {
355 struct orangefs_write_range *wr;
356 wr = folio_get_private(folio);
357 if (wr->pos + wr->len == pos &&
358 uid_eq(wr->uid, current_fsuid()) &&
359 gid_eq(wr->gid, current_fsgid())) {
360 wr->len += len;
361 goto okay;
362 } else {
363 ret = orangefs_launder_folio(folio);
364 if (ret)
365 return ret;
366 }
367 }
368
369 wr = kmalloc(sizeof *wr, GFP_KERNEL);
370 if (!wr)
371 return -ENOMEM;
372
373 wr->pos = pos;
374 wr->len = len;
375 wr->uid = current_fsuid();
376 wr->gid = current_fsgid();
377 folio_attach_private(folio, wr);
378 okay:
379 return 0;
380 }
381
orangefs_write_end(struct file * file,struct address_space * mapping,loff_t pos,unsigned len,unsigned copied,struct page * page,void * fsdata)382 static int orangefs_write_end(struct file *file, struct address_space *mapping,
383 loff_t pos, unsigned len, unsigned copied, struct page *page, void *fsdata)
384 {
385 struct inode *inode = page->mapping->host;
386 loff_t last_pos = pos + copied;
387
388 /*
389 * No need to use i_size_read() here, the i_size
390 * cannot change under us because we hold the i_mutex.
391 */
392 if (last_pos > inode->i_size)
393 i_size_write(inode, last_pos);
394
395 /* zero the stale part of the page if we did a short copy */
396 if (!PageUptodate(page)) {
397 unsigned from = pos & (PAGE_SIZE - 1);
398 if (copied < len) {
399 zero_user(page, from + copied, len - copied);
400 }
401 /* Set fully written pages uptodate. */
402 if (pos == page_offset(page) &&
403 (len == PAGE_SIZE || pos + len == inode->i_size)) {
404 zero_user_segment(page, from + copied, PAGE_SIZE);
405 SetPageUptodate(page);
406 }
407 }
408
409 set_page_dirty(page);
410 unlock_page(page);
411 put_page(page);
412
413 mark_inode_dirty_sync(file_inode(file));
414 return copied;
415 }
416
orangefs_invalidate_folio(struct folio * folio,size_t offset,size_t length)417 static void orangefs_invalidate_folio(struct folio *folio,
418 size_t offset, size_t length)
419 {
420 struct orangefs_write_range *wr = folio_get_private(folio);
421
422 if (offset == 0 && length == PAGE_SIZE) {
423 kfree(folio_detach_private(folio));
424 return;
425 /* write range entirely within invalidate range (or equal) */
426 } else if (folio_pos(folio) + offset <= wr->pos &&
427 wr->pos + wr->len <= folio_pos(folio) + offset + length) {
428 kfree(folio_detach_private(folio));
429 /* XXX is this right? only caller in fs */
430 folio_cancel_dirty(folio);
431 return;
432 /* invalidate range chops off end of write range */
433 } else if (wr->pos < folio_pos(folio) + offset &&
434 wr->pos + wr->len <= folio_pos(folio) + offset + length &&
435 folio_pos(folio) + offset < wr->pos + wr->len) {
436 size_t x;
437 x = wr->pos + wr->len - (folio_pos(folio) + offset);
438 WARN_ON(x > wr->len);
439 wr->len -= x;
440 wr->uid = current_fsuid();
441 wr->gid = current_fsgid();
442 /* invalidate range chops off beginning of write range */
443 } else if (folio_pos(folio) + offset <= wr->pos &&
444 folio_pos(folio) + offset + length < wr->pos + wr->len &&
445 wr->pos < folio_pos(folio) + offset + length) {
446 size_t x;
447 x = folio_pos(folio) + offset + length - wr->pos;
448 WARN_ON(x > wr->len);
449 wr->pos += x;
450 wr->len -= x;
451 wr->uid = current_fsuid();
452 wr->gid = current_fsgid();
453 /* invalidate range entirely within write range (punch hole) */
454 } else if (wr->pos < folio_pos(folio) + offset &&
455 folio_pos(folio) + offset + length < wr->pos + wr->len) {
456 /* XXX what do we do here... should not WARN_ON */
457 WARN_ON(1);
458 /* punch hole */
459 /*
460 * should we just ignore this and write it out anyway?
461 * it hardly makes sense
462 */
463 return;
464 /* non-overlapping ranges */
465 } else {
466 /* WARN if they do overlap */
467 if (!((folio_pos(folio) + offset + length <= wr->pos) ^
468 (wr->pos + wr->len <= folio_pos(folio) + offset))) {
469 WARN_ON(1);
470 printk("invalidate range offset %llu length %zu\n",
471 folio_pos(folio) + offset, length);
472 printk("write range offset %llu length %zu\n",
473 wr->pos, wr->len);
474 }
475 return;
476 }
477
478 /*
479 * Above there are returns where wr is freed or where we WARN.
480 * Thus the following runs if wr was modified above.
481 */
482
483 orangefs_launder_folio(folio);
484 }
485
orangefs_release_folio(struct folio * folio,gfp_t foo)486 static bool orangefs_release_folio(struct folio *folio, gfp_t foo)
487 {
488 return !folio_test_private(folio);
489 }
490
orangefs_free_folio(struct folio * folio)491 static void orangefs_free_folio(struct folio *folio)
492 {
493 kfree(folio_detach_private(folio));
494 }
495
orangefs_launder_folio(struct folio * folio)496 static int orangefs_launder_folio(struct folio *folio)
497 {
498 int r = 0;
499 struct writeback_control wbc = {
500 .sync_mode = WB_SYNC_ALL,
501 .nr_to_write = 0,
502 };
503 folio_wait_writeback(folio);
504 if (folio_clear_dirty_for_io(folio)) {
505 r = orangefs_writepage_locked(&folio->page, &wbc);
506 folio_end_writeback(folio);
507 }
508 return r;
509 }
510
orangefs_direct_IO(struct kiocb * iocb,struct iov_iter * iter)511 static ssize_t orangefs_direct_IO(struct kiocb *iocb,
512 struct iov_iter *iter)
513 {
514 /*
515 * Comment from original do_readv_writev:
516 * Common entry point for read/write/readv/writev
517 * This function will dispatch it to either the direct I/O
518 * or buffered I/O path depending on the mount options and/or
519 * augmented/extended metadata attached to the file.
520 * Note: File extended attributes override any mount options.
521 */
522 struct file *file = iocb->ki_filp;
523 loff_t pos = iocb->ki_pos;
524 enum ORANGEFS_io_type type = iov_iter_rw(iter) == WRITE ?
525 ORANGEFS_IO_WRITE : ORANGEFS_IO_READ;
526 loff_t *offset = &pos;
527 struct inode *inode = file->f_mapping->host;
528 struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
529 struct orangefs_khandle *handle = &orangefs_inode->refn.khandle;
530 size_t count = iov_iter_count(iter);
531 ssize_t total_count = 0;
532 ssize_t ret = -EINVAL;
533 int i = 0;
534
535 gossip_debug(GOSSIP_FILE_DEBUG,
536 "%s-BEGIN(%pU): count(%d) after estimate_max_iovecs.\n",
537 __func__,
538 handle,
539 (int)count);
540
541 if (type == ORANGEFS_IO_WRITE) {
542 gossip_debug(GOSSIP_FILE_DEBUG,
543 "%s(%pU): proceeding with offset : %llu, "
544 "size %d\n",
545 __func__,
546 handle,
547 llu(*offset),
548 (int)count);
549 }
550
551 if (count == 0) {
552 ret = 0;
553 goto out;
554 }
555
556 while (iov_iter_count(iter)) {
557 size_t each_count = iov_iter_count(iter);
558 size_t amt_complete;
559 i++;
560
561 /* how much to transfer in this loop iteration */
562 if (each_count > orangefs_bufmap_size_query())
563 each_count = orangefs_bufmap_size_query();
564
565 gossip_debug(GOSSIP_FILE_DEBUG,
566 "%s(%pU): size of each_count(%d)\n",
567 __func__,
568 handle,
569 (int)each_count);
570 gossip_debug(GOSSIP_FILE_DEBUG,
571 "%s(%pU): BEFORE wait_for_io: offset is %d\n",
572 __func__,
573 handle,
574 (int)*offset);
575
576 ret = wait_for_direct_io(type, inode, offset, iter,
577 each_count, 0, NULL, NULL, file);
578 gossip_debug(GOSSIP_FILE_DEBUG,
579 "%s(%pU): return from wait_for_io:%d\n",
580 __func__,
581 handle,
582 (int)ret);
583
584 if (ret < 0)
585 goto out;
586
587 *offset += ret;
588 total_count += ret;
589 amt_complete = ret;
590
591 gossip_debug(GOSSIP_FILE_DEBUG,
592 "%s(%pU): AFTER wait_for_io: offset is %d\n",
593 __func__,
594 handle,
595 (int)*offset);
596
597 /*
598 * if we got a short I/O operations,
599 * fall out and return what we got so far
600 */
601 if (amt_complete < each_count)
602 break;
603 } /*end while */
604
605 out:
606 if (total_count > 0)
607 ret = total_count;
608 if (ret > 0) {
609 if (type == ORANGEFS_IO_READ) {
610 file_accessed(file);
611 } else {
612 file_update_time(file);
613 if (*offset > i_size_read(inode))
614 i_size_write(inode, *offset);
615 }
616 }
617
618 gossip_debug(GOSSIP_FILE_DEBUG,
619 "%s(%pU): Value(%d) returned.\n",
620 __func__,
621 handle,
622 (int)ret);
623
624 return ret;
625 }
626
627 /** ORANGEFS2 implementation of address space operations */
628 static const struct address_space_operations orangefs_address_operations = {
629 .writepage = orangefs_writepage,
630 .readahead = orangefs_readahead,
631 .read_folio = orangefs_read_folio,
632 .writepages = orangefs_writepages,
633 .dirty_folio = filemap_dirty_folio,
634 .write_begin = orangefs_write_begin,
635 .write_end = orangefs_write_end,
636 .invalidate_folio = orangefs_invalidate_folio,
637 .release_folio = orangefs_release_folio,
638 .free_folio = orangefs_free_folio,
639 .launder_folio = orangefs_launder_folio,
640 .direct_IO = orangefs_direct_IO,
641 };
642
orangefs_page_mkwrite(struct vm_fault * vmf)643 vm_fault_t orangefs_page_mkwrite(struct vm_fault *vmf)
644 {
645 struct folio *folio = page_folio(vmf->page);
646 struct inode *inode = file_inode(vmf->vma->vm_file);
647 struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
648 unsigned long *bitlock = &orangefs_inode->bitlock;
649 vm_fault_t ret;
650 struct orangefs_write_range *wr;
651
652 sb_start_pagefault(inode->i_sb);
653
654 if (wait_on_bit(bitlock, 1, TASK_KILLABLE)) {
655 ret = VM_FAULT_RETRY;
656 goto out;
657 }
658
659 folio_lock(folio);
660 if (folio_test_dirty(folio) && !folio_test_private(folio)) {
661 /*
662 * Should be impossible. If it happens, launder the folio
663 * since we don't know what's dirty. This will WARN in
664 * orangefs_writepage_locked.
665 */
666 if (orangefs_launder_folio(folio)) {
667 ret = VM_FAULT_LOCKED|VM_FAULT_RETRY;
668 goto out;
669 }
670 }
671 if (folio_test_private(folio)) {
672 wr = folio_get_private(folio);
673 if (uid_eq(wr->uid, current_fsuid()) &&
674 gid_eq(wr->gid, current_fsgid())) {
675 wr->pos = page_offset(vmf->page);
676 wr->len = PAGE_SIZE;
677 goto okay;
678 } else {
679 if (orangefs_launder_folio(folio)) {
680 ret = VM_FAULT_LOCKED|VM_FAULT_RETRY;
681 goto out;
682 }
683 }
684 }
685 wr = kmalloc(sizeof *wr, GFP_KERNEL);
686 if (!wr) {
687 ret = VM_FAULT_LOCKED|VM_FAULT_RETRY;
688 goto out;
689 }
690 wr->pos = page_offset(vmf->page);
691 wr->len = PAGE_SIZE;
692 wr->uid = current_fsuid();
693 wr->gid = current_fsgid();
694 folio_attach_private(folio, wr);
695 okay:
696
697 file_update_time(vmf->vma->vm_file);
698 if (folio->mapping != inode->i_mapping) {
699 folio_unlock(folio);
700 ret = VM_FAULT_LOCKED|VM_FAULT_NOPAGE;
701 goto out;
702 }
703
704 /*
705 * We mark the folio dirty already here so that when freeze is in
706 * progress, we are guaranteed that writeback during freezing will
707 * see the dirty folio and writeprotect it again.
708 */
709 folio_mark_dirty(folio);
710 folio_wait_stable(folio);
711 ret = VM_FAULT_LOCKED;
712 out:
713 sb_end_pagefault(inode->i_sb);
714 return ret;
715 }
716
orangefs_setattr_size(struct inode * inode,struct iattr * iattr)717 static int orangefs_setattr_size(struct inode *inode, struct iattr *iattr)
718 {
719 struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
720 struct orangefs_kernel_op_s *new_op;
721 loff_t orig_size;
722 int ret = -EINVAL;
723
724 gossip_debug(GOSSIP_INODE_DEBUG,
725 "%s: %pU: Handle is %pU | fs_id %d | size is %llu\n",
726 __func__,
727 get_khandle_from_ino(inode),
728 &orangefs_inode->refn.khandle,
729 orangefs_inode->refn.fs_id,
730 iattr->ia_size);
731
732 /* Ensure that we have a up to date size, so we know if it changed. */
733 ret = orangefs_inode_getattr(inode, ORANGEFS_GETATTR_SIZE);
734 if (ret == -ESTALE)
735 ret = -EIO;
736 if (ret) {
737 gossip_err("%s: orangefs_inode_getattr failed, ret:%d:.\n",
738 __func__, ret);
739 return ret;
740 }
741 orig_size = i_size_read(inode);
742
743 /* This is truncate_setsize in a different order. */
744 truncate_pagecache(inode, iattr->ia_size);
745 i_size_write(inode, iattr->ia_size);
746 if (iattr->ia_size > orig_size)
747 pagecache_isize_extended(inode, orig_size, iattr->ia_size);
748
749 new_op = op_alloc(ORANGEFS_VFS_OP_TRUNCATE);
750 if (!new_op)
751 return -ENOMEM;
752
753 new_op->upcall.req.truncate.refn = orangefs_inode->refn;
754 new_op->upcall.req.truncate.size = (__s64) iattr->ia_size;
755
756 ret = service_operation(new_op,
757 __func__,
758 get_interruptible_flag(inode));
759
760 /*
761 * the truncate has no downcall members to retrieve, but
762 * the status value tells us if it went through ok or not
763 */
764 gossip_debug(GOSSIP_INODE_DEBUG, "%s: ret:%d:\n", __func__, ret);
765
766 op_release(new_op);
767
768 if (ret != 0)
769 return ret;
770
771 if (orig_size != i_size_read(inode))
772 iattr->ia_valid |= ATTR_CTIME | ATTR_MTIME;
773
774 return ret;
775 }
776
__orangefs_setattr(struct inode * inode,struct iattr * iattr)777 int __orangefs_setattr(struct inode *inode, struct iattr *iattr)
778 {
779 int ret;
780
781 if (iattr->ia_valid & ATTR_MODE) {
782 if (iattr->ia_mode & (S_ISVTX)) {
783 if (is_root_handle(inode)) {
784 /*
785 * allow sticky bit to be set on root (since
786 * it shows up that way by default anyhow),
787 * but don't show it to the server
788 */
789 iattr->ia_mode -= S_ISVTX;
790 } else {
791 gossip_debug(GOSSIP_UTILS_DEBUG,
792 "User attempted to set sticky bit on non-root directory; returning EINVAL.\n");
793 ret = -EINVAL;
794 goto out;
795 }
796 }
797 if (iattr->ia_mode & (S_ISUID)) {
798 gossip_debug(GOSSIP_UTILS_DEBUG,
799 "Attempting to set setuid bit (not supported); returning EINVAL.\n");
800 ret = -EINVAL;
801 goto out;
802 }
803 }
804
805 if (iattr->ia_valid & ATTR_SIZE) {
806 ret = orangefs_setattr_size(inode, iattr);
807 if (ret)
808 goto out;
809 }
810
811 again:
812 spin_lock(&inode->i_lock);
813 if (ORANGEFS_I(inode)->attr_valid) {
814 if (uid_eq(ORANGEFS_I(inode)->attr_uid, current_fsuid()) &&
815 gid_eq(ORANGEFS_I(inode)->attr_gid, current_fsgid())) {
816 ORANGEFS_I(inode)->attr_valid = iattr->ia_valid;
817 } else {
818 spin_unlock(&inode->i_lock);
819 write_inode_now(inode, 1);
820 goto again;
821 }
822 } else {
823 ORANGEFS_I(inode)->attr_valid = iattr->ia_valid;
824 ORANGEFS_I(inode)->attr_uid = current_fsuid();
825 ORANGEFS_I(inode)->attr_gid = current_fsgid();
826 }
827 setattr_copy(&init_user_ns, inode, iattr);
828 spin_unlock(&inode->i_lock);
829 mark_inode_dirty(inode);
830
831 if (iattr->ia_valid & ATTR_MODE)
832 /* change mod on a file that has ACLs */
833 ret = posix_acl_chmod(&init_user_ns, inode, inode->i_mode);
834
835 ret = 0;
836 out:
837 return ret;
838 }
839
840 /*
841 * Change attributes of an object referenced by dentry.
842 */
orangefs_setattr(struct user_namespace * mnt_userns,struct dentry * dentry,struct iattr * iattr)843 int orangefs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
844 struct iattr *iattr)
845 {
846 int ret;
847 gossip_debug(GOSSIP_INODE_DEBUG, "__orangefs_setattr: called on %pd\n",
848 dentry);
849 ret = setattr_prepare(&init_user_ns, dentry, iattr);
850 if (ret)
851 goto out;
852 ret = __orangefs_setattr(d_inode(dentry), iattr);
853 sync_inode_metadata(d_inode(dentry), 1);
854 out:
855 gossip_debug(GOSSIP_INODE_DEBUG, "orangefs_setattr: returning %d\n",
856 ret);
857 return ret;
858 }
859
860 /*
861 * Obtain attributes of an object given a dentry
862 */
orangefs_getattr(struct user_namespace * mnt_userns,const struct path * path,struct kstat * stat,u32 request_mask,unsigned int flags)863 int orangefs_getattr(struct user_namespace *mnt_userns, const struct path *path,
864 struct kstat *stat, u32 request_mask, unsigned int flags)
865 {
866 int ret;
867 struct inode *inode = path->dentry->d_inode;
868
869 gossip_debug(GOSSIP_INODE_DEBUG,
870 "orangefs_getattr: called on %pd mask %u\n",
871 path->dentry, request_mask);
872
873 ret = orangefs_inode_getattr(inode,
874 request_mask & STATX_SIZE ? ORANGEFS_GETATTR_SIZE : 0);
875 if (ret == 0) {
876 generic_fillattr(&init_user_ns, inode, stat);
877
878 /* override block size reported to stat */
879 if (!(request_mask & STATX_SIZE))
880 stat->result_mask &= ~STATX_SIZE;
881
882 generic_fill_statx_attr(inode, stat);
883 }
884 return ret;
885 }
886
orangefs_permission(struct user_namespace * mnt_userns,struct inode * inode,int mask)887 int orangefs_permission(struct user_namespace *mnt_userns,
888 struct inode *inode, int mask)
889 {
890 int ret;
891
892 if (mask & MAY_NOT_BLOCK)
893 return -ECHILD;
894
895 gossip_debug(GOSSIP_INODE_DEBUG, "%s: refreshing\n", __func__);
896
897 /* Make sure the permission (and other common attrs) are up to date. */
898 ret = orangefs_inode_getattr(inode, 0);
899 if (ret < 0)
900 return ret;
901
902 return generic_permission(&init_user_ns, inode, mask);
903 }
904
orangefs_update_time(struct inode * inode,struct timespec64 * time,int flags)905 int orangefs_update_time(struct inode *inode, struct timespec64 *time, int flags)
906 {
907 struct iattr iattr;
908 gossip_debug(GOSSIP_INODE_DEBUG, "orangefs_update_time: %pU\n",
909 get_khandle_from_ino(inode));
910 generic_update_time(inode, time, flags);
911 memset(&iattr, 0, sizeof iattr);
912 if (flags & S_ATIME)
913 iattr.ia_valid |= ATTR_ATIME;
914 if (flags & S_CTIME)
915 iattr.ia_valid |= ATTR_CTIME;
916 if (flags & S_MTIME)
917 iattr.ia_valid |= ATTR_MTIME;
918 return __orangefs_setattr(inode, &iattr);
919 }
920
orangefs_fileattr_get(struct dentry * dentry,struct fileattr * fa)921 static int orangefs_fileattr_get(struct dentry *dentry, struct fileattr *fa)
922 {
923 u64 val = 0;
924 int ret;
925
926 gossip_debug(GOSSIP_FILE_DEBUG, "%s: called on %pd\n", __func__,
927 dentry);
928
929 ret = orangefs_inode_getxattr(d_inode(dentry),
930 "user.pvfs2.meta_hint",
931 &val, sizeof(val));
932 if (ret < 0 && ret != -ENODATA)
933 return ret;
934
935 gossip_debug(GOSSIP_FILE_DEBUG, "%s: flags=%u\n", __func__, (u32) val);
936
937 fileattr_fill_flags(fa, val);
938 return 0;
939 }
940
orangefs_fileattr_set(struct user_namespace * mnt_userns,struct dentry * dentry,struct fileattr * fa)941 static int orangefs_fileattr_set(struct user_namespace *mnt_userns,
942 struct dentry *dentry, struct fileattr *fa)
943 {
944 u64 val = 0;
945
946 gossip_debug(GOSSIP_FILE_DEBUG, "%s: called on %pd\n", __func__,
947 dentry);
948 /*
949 * ORANGEFS_MIRROR_FL is set internally when the mirroring mode is
950 * turned on for a file. The user is not allowed to turn on this bit,
951 * but the bit is present if the user first gets the flags and then
952 * updates the flags with some new settings. So, we ignore it in the
953 * following edit. bligon.
954 */
955 if (fileattr_has_fsx(fa) ||
956 (fa->flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | FS_NOATIME_FL | ORANGEFS_MIRROR_FL))) {
957 gossip_err("%s: only supports setting one of FS_IMMUTABLE_FL|FS_APPEND_FL|FS_NOATIME_FL\n",
958 __func__);
959 return -EOPNOTSUPP;
960 }
961 val = fa->flags;
962 gossip_debug(GOSSIP_FILE_DEBUG, "%s: flags=%u\n", __func__, (u32) val);
963 return orangefs_inode_setxattr(d_inode(dentry),
964 "user.pvfs2.meta_hint",
965 &val, sizeof(val), 0);
966 }
967
968 /* ORANGEFS2 implementation of VFS inode operations for files */
969 static const struct inode_operations orangefs_file_inode_operations = {
970 .get_acl = orangefs_get_acl,
971 .set_acl = orangefs_set_acl,
972 .setattr = orangefs_setattr,
973 .getattr = orangefs_getattr,
974 .listxattr = orangefs_listxattr,
975 .permission = orangefs_permission,
976 .update_time = orangefs_update_time,
977 .fileattr_get = orangefs_fileattr_get,
978 .fileattr_set = orangefs_fileattr_set,
979 };
980
orangefs_init_iops(struct inode * inode)981 static int orangefs_init_iops(struct inode *inode)
982 {
983 inode->i_mapping->a_ops = &orangefs_address_operations;
984
985 switch (inode->i_mode & S_IFMT) {
986 case S_IFREG:
987 inode->i_op = &orangefs_file_inode_operations;
988 inode->i_fop = &orangefs_file_operations;
989 break;
990 case S_IFLNK:
991 inode->i_op = &orangefs_symlink_inode_operations;
992 break;
993 case S_IFDIR:
994 inode->i_op = &orangefs_dir_inode_operations;
995 inode->i_fop = &orangefs_dir_operations;
996 break;
997 default:
998 gossip_debug(GOSSIP_INODE_DEBUG,
999 "%s: unsupported mode\n",
1000 __func__);
1001 return -EINVAL;
1002 }
1003
1004 return 0;
1005 }
1006
1007 /*
1008 * Given an ORANGEFS object identifier (fsid, handle), convert it into
1009 * a ino_t type that will be used as a hash-index from where the handle will
1010 * be searched for in the VFS hash table of inodes.
1011 */
orangefs_handle_hash(struct orangefs_object_kref * ref)1012 static inline ino_t orangefs_handle_hash(struct orangefs_object_kref *ref)
1013 {
1014 if (!ref)
1015 return 0;
1016 return orangefs_khandle_to_ino(&(ref->khandle));
1017 }
1018
1019 /*
1020 * Called to set up an inode from iget5_locked.
1021 */
orangefs_set_inode(struct inode * inode,void * data)1022 static int orangefs_set_inode(struct inode *inode, void *data)
1023 {
1024 struct orangefs_object_kref *ref = (struct orangefs_object_kref *) data;
1025 ORANGEFS_I(inode)->refn.fs_id = ref->fs_id;
1026 ORANGEFS_I(inode)->refn.khandle = ref->khandle;
1027 ORANGEFS_I(inode)->attr_valid = 0;
1028 hash_init(ORANGEFS_I(inode)->xattr_cache);
1029 ORANGEFS_I(inode)->mapping_time = jiffies - 1;
1030 ORANGEFS_I(inode)->bitlock = 0;
1031 return 0;
1032 }
1033
1034 /*
1035 * Called to determine if handles match.
1036 */
orangefs_test_inode(struct inode * inode,void * data)1037 static int orangefs_test_inode(struct inode *inode, void *data)
1038 {
1039 struct orangefs_object_kref *ref = (struct orangefs_object_kref *) data;
1040 struct orangefs_inode_s *orangefs_inode = NULL;
1041
1042 orangefs_inode = ORANGEFS_I(inode);
1043 /* test handles and fs_ids... */
1044 return (!ORANGEFS_khandle_cmp(&(orangefs_inode->refn.khandle),
1045 &(ref->khandle)) &&
1046 orangefs_inode->refn.fs_id == ref->fs_id);
1047 }
1048
1049 /*
1050 * Front-end to lookup the inode-cache maintained by the VFS using the ORANGEFS
1051 * file handle.
1052 *
1053 * @sb: the file system super block instance.
1054 * @ref: The ORANGEFS object for which we are trying to locate an inode.
1055 */
orangefs_iget(struct super_block * sb,struct orangefs_object_kref * ref)1056 struct inode *orangefs_iget(struct super_block *sb,
1057 struct orangefs_object_kref *ref)
1058 {
1059 struct inode *inode = NULL;
1060 unsigned long hash;
1061 int error;
1062
1063 hash = orangefs_handle_hash(ref);
1064 inode = iget5_locked(sb,
1065 hash,
1066 orangefs_test_inode,
1067 orangefs_set_inode,
1068 ref);
1069
1070 if (!inode)
1071 return ERR_PTR(-ENOMEM);
1072
1073 if (!(inode->i_state & I_NEW))
1074 return inode;
1075
1076 error = orangefs_inode_getattr(inode, ORANGEFS_GETATTR_NEW);
1077 if (error) {
1078 iget_failed(inode);
1079 return ERR_PTR(error);
1080 }
1081
1082 inode->i_ino = hash; /* needed for stat etc */
1083 orangefs_init_iops(inode);
1084 unlock_new_inode(inode);
1085
1086 gossip_debug(GOSSIP_INODE_DEBUG,
1087 "iget handle %pU, fsid %d hash %ld i_ino %lu\n",
1088 &ref->khandle,
1089 ref->fs_id,
1090 hash,
1091 inode->i_ino);
1092
1093 return inode;
1094 }
1095
1096 /*
1097 * Allocate an inode for a newly created file and insert it into the inode hash.
1098 */
orangefs_new_inode(struct super_block * sb,struct inode * dir,int mode,dev_t dev,struct orangefs_object_kref * ref)1099 struct inode *orangefs_new_inode(struct super_block *sb, struct inode *dir,
1100 int mode, dev_t dev, struct orangefs_object_kref *ref)
1101 {
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 orangefs_set_inode(inode, ref);
1119 inode->i_ino = hash; /* needed for stat etc */
1120
1121 error = orangefs_inode_getattr(inode, ORANGEFS_GETATTR_NEW);
1122 if (error)
1123 goto out_iput;
1124
1125 orangefs_init_iops(inode);
1126 inode->i_rdev = dev;
1127
1128 error = insert_inode_locked4(inode, hash, orangefs_test_inode, ref);
1129 if (error < 0)
1130 goto out_iput;
1131
1132 gossip_debug(GOSSIP_INODE_DEBUG,
1133 "Initializing ACL's for inode %pU\n",
1134 get_khandle_from_ino(inode));
1135 orangefs_init_acl(inode, dir);
1136 return inode;
1137
1138 out_iput:
1139 iput(inode);
1140 return ERR_PTR(error);
1141 }
1142