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