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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (c) 2020-2024 Oracle. All Rights Reserved.
4 * Author: Darrick J. Wong <djwong@kernel.org>
5 */
6#include "xfs.h"
7#include "xfs_fs.h"
8#include "xfs_format.h"
9#include "xfs_log_format.h"
10#include "xfs_trans_resv.h"
11#include "xfs_bit.h"
12#include "xfs_shared.h"
13#include "xfs_mount.h"
14#include "xfs_defer.h"
15#include "xfs_inode.h"
16#include "xfs_trans.h"
17#include "xfs_trans_priv.h"
18#include "xfs_exchmaps_item.h"
19#include "xfs_exchmaps.h"
20#include "xfs_log.h"
21#include "xfs_bmap.h"
22#include "xfs_icache.h"
23#include "xfs_bmap_btree.h"
24#include "xfs_trans_space.h"
25#include "xfs_error.h"
26#include "xfs_log_priv.h"
27#include "xfs_log_recover.h"
28#include "xfs_exchrange.h"
29#include "xfs_trace.h"
30
31struct kmem_cache *xfs_xmi_cache;
32struct kmem_cache *xfs_xmd_cache;
33
34static const struct xfs_item_ops xfs_xmi_item_ops;
35
36static inline struct xfs_xmi_log_item *XMI_ITEM(struct xfs_log_item *lip)
37{
38 return container_of(lip, struct xfs_xmi_log_item, xmi_item);
39}
40
41STATIC void
42xfs_xmi_item_free(
43 struct xfs_xmi_log_item *xmi_lip)
44{
45 kvfree(xmi_lip->xmi_item.li_lv_shadow);
46 kmem_cache_free(xfs_xmi_cache, xmi_lip);
47}
48
49/*
50 * Freeing the XMI requires that we remove it from the AIL if it has already
51 * been placed there. However, the XMI may not yet have been placed in the AIL
52 * when called by xfs_xmi_release() from XMD processing due to the ordering of
53 * committed vs unpin operations in bulk insert operations. Hence the reference
54 * count to ensure only the last caller frees the XMI.
55 */
56STATIC void
57xfs_xmi_release(
58 struct xfs_xmi_log_item *xmi_lip)
59{
60 ASSERT(atomic_read(&xmi_lip->xmi_refcount) > 0);
61 if (atomic_dec_and_test(&xmi_lip->xmi_refcount)) {
62 xfs_trans_ail_delete(&xmi_lip->xmi_item, 0);
63 xfs_xmi_item_free(xmi_lip);
64 }
65}
66
67
68STATIC void
69xfs_xmi_item_size(
70 struct xfs_log_item *lip,
71 int *nvecs,
72 int *nbytes)
73{
74 *nvecs += 1;
75 *nbytes += sizeof(struct xfs_xmi_log_format);
76}
77
78/*
79 * This is called to fill in the vector of log iovecs for the given xmi log
80 * item. We use only 1 iovec, and we point that at the xmi_log_format structure
81 * embedded in the xmi item.
82 */
83STATIC void
84xfs_xmi_item_format(
85 struct xfs_log_item *lip,
86 struct xfs_log_vec *lv)
87{
88 struct xfs_xmi_log_item *xmi_lip = XMI_ITEM(lip);
89 struct xfs_log_iovec *vecp = NULL;
90
91 xmi_lip->xmi_format.xmi_type = XFS_LI_XMI;
92 xmi_lip->xmi_format.xmi_size = 1;
93
94 xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_XMI_FORMAT,
95 &xmi_lip->xmi_format,
96 sizeof(struct xfs_xmi_log_format));
97}
98
99/*
100 * The unpin operation is the last place an XMI is manipulated in the log. It
101 * is either inserted in the AIL or aborted in the event of a log I/O error. In
102 * either case, the XMI transaction has been successfully committed to make it
103 * this far. Therefore, we expect whoever committed the XMI to either construct
104 * and commit the XMD or drop the XMD's reference in the event of error. Simply
105 * drop the log's XMI reference now that the log is done with it.
106 */
107STATIC void
108xfs_xmi_item_unpin(
109 struct xfs_log_item *lip,
110 int remove)
111{
112 struct xfs_xmi_log_item *xmi_lip = XMI_ITEM(lip);
113
114 xfs_xmi_release(xmi_lip);
115}
116
117/*
118 * The XMI has been either committed or aborted if the transaction has been
119 * cancelled. If the transaction was cancelled, an XMD isn't going to be
120 * constructed and thus we free the XMI here directly.
121 */
122STATIC void
123xfs_xmi_item_release(
124 struct xfs_log_item *lip)
125{
126 xfs_xmi_release(XMI_ITEM(lip));
127}
128
129/* Allocate and initialize an xmi item. */
130STATIC struct xfs_xmi_log_item *
131xfs_xmi_init(
132 struct xfs_mount *mp)
133
134{
135 struct xfs_xmi_log_item *xmi_lip;
136
137 xmi_lip = kmem_cache_zalloc(xfs_xmi_cache, GFP_KERNEL | __GFP_NOFAIL);
138
139 xfs_log_item_init(mp, &xmi_lip->xmi_item, XFS_LI_XMI, &xfs_xmi_item_ops);
140 xmi_lip->xmi_format.xmi_id = (uintptr_t)(void *)xmi_lip;
141 atomic_set(&xmi_lip->xmi_refcount, 2);
142
143 return xmi_lip;
144}
145
146static inline struct xfs_xmd_log_item *XMD_ITEM(struct xfs_log_item *lip)
147{
148 return container_of(lip, struct xfs_xmd_log_item, xmd_item);
149}
150
151STATIC void
152xfs_xmd_item_size(
153 struct xfs_log_item *lip,
154 int *nvecs,
155 int *nbytes)
156{
157 *nvecs += 1;
158 *nbytes += sizeof(struct xfs_xmd_log_format);
159}
160
161/*
162 * This is called to fill in the vector of log iovecs for the given xmd log
163 * item. We use only 1 iovec, and we point that at the xmd_log_format structure
164 * embedded in the xmd item.
165 */
166STATIC void
167xfs_xmd_item_format(
168 struct xfs_log_item *lip,
169 struct xfs_log_vec *lv)
170{
171 struct xfs_xmd_log_item *xmd_lip = XMD_ITEM(lip);
172 struct xfs_log_iovec *vecp = NULL;
173
174 xmd_lip->xmd_format.xmd_type = XFS_LI_XMD;
175 xmd_lip->xmd_format.xmd_size = 1;
176
177 xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_XMD_FORMAT, &xmd_lip->xmd_format,
178 sizeof(struct xfs_xmd_log_format));
179}
180
181/*
182 * The XMD is either committed or aborted if the transaction is cancelled. If
183 * the transaction is cancelled, drop our reference to the XMI and free the
184 * XMD.
185 */
186STATIC void
187xfs_xmd_item_release(
188 struct xfs_log_item *lip)
189{
190 struct xfs_xmd_log_item *xmd_lip = XMD_ITEM(lip);
191
192 xfs_xmi_release(xmd_lip->xmd_intent_log_item);
193 kvfree(xmd_lip->xmd_item.li_lv_shadow);
194 kmem_cache_free(xfs_xmd_cache, xmd_lip);
195}
196
197static struct xfs_log_item *
198xfs_xmd_item_intent(
199 struct xfs_log_item *lip)
200{
201 return &XMD_ITEM(lip)->xmd_intent_log_item->xmi_item;
202}
203
204static const struct xfs_item_ops xfs_xmd_item_ops = {
205 .flags = XFS_ITEM_RELEASE_WHEN_COMMITTED |
206 XFS_ITEM_INTENT_DONE,
207 .iop_size = xfs_xmd_item_size,
208 .iop_format = xfs_xmd_item_format,
209 .iop_release = xfs_xmd_item_release,
210 .iop_intent = xfs_xmd_item_intent,
211};
212
213/* Log file mapping exchange information in the intent item. */
214STATIC struct xfs_log_item *
215xfs_exchmaps_create_intent(
216 struct xfs_trans *tp,
217 struct list_head *items,
218 unsigned int count,
219 bool sort)
220{
221 struct xfs_xmi_log_item *xmi_lip;
222 struct xfs_exchmaps_intent *xmi;
223 struct xfs_xmi_log_format *xlf;
224
225 ASSERT(count == 1);
226
227 xmi = list_first_entry_or_null(items, struct xfs_exchmaps_intent,
228 xmi_list);
229
230 xmi_lip = xfs_xmi_init(tp->t_mountp);
231 xlf = &xmi_lip->xmi_format;
232
233 xlf->xmi_inode1 = xmi->xmi_ip1->i_ino;
234 xlf->xmi_igen1 = VFS_I(xmi->xmi_ip1)->i_generation;
235 xlf->xmi_inode2 = xmi->xmi_ip2->i_ino;
236 xlf->xmi_igen2 = VFS_I(xmi->xmi_ip2)->i_generation;
237 xlf->xmi_startoff1 = xmi->xmi_startoff1;
238 xlf->xmi_startoff2 = xmi->xmi_startoff2;
239 xlf->xmi_blockcount = xmi->xmi_blockcount;
240 xlf->xmi_isize1 = xmi->xmi_isize1;
241 xlf->xmi_isize2 = xmi->xmi_isize2;
242 xlf->xmi_flags = xmi->xmi_flags & XFS_EXCHMAPS_LOGGED_FLAGS;
243
244 return &xmi_lip->xmi_item;
245}
246
247STATIC struct xfs_log_item *
248xfs_exchmaps_create_done(
249 struct xfs_trans *tp,
250 struct xfs_log_item *intent,
251 unsigned int count)
252{
253 struct xfs_xmi_log_item *xmi_lip = XMI_ITEM(intent);
254 struct xfs_xmd_log_item *xmd_lip;
255
256 xmd_lip = kmem_cache_zalloc(xfs_xmd_cache, GFP_KERNEL | __GFP_NOFAIL);
257 xfs_log_item_init(tp->t_mountp, &xmd_lip->xmd_item, XFS_LI_XMD,
258 &xfs_xmd_item_ops);
259 xmd_lip->xmd_intent_log_item = xmi_lip;
260 xmd_lip->xmd_format.xmd_xmi_id = xmi_lip->xmi_format.xmi_id;
261
262 return &xmd_lip->xmd_item;
263}
264
265/* Add this deferred XMI to the transaction. */
266void
267xfs_exchmaps_defer_add(
268 struct xfs_trans *tp,
269 struct xfs_exchmaps_intent *xmi)
270{
271 trace_xfs_exchmaps_defer(tp->t_mountp, xmi);
272
273 xfs_defer_add(tp, &xmi->xmi_list, &xfs_exchmaps_defer_type);
274}
275
276static inline struct xfs_exchmaps_intent *xmi_entry(const struct list_head *e)
277{
278 return list_entry(e, struct xfs_exchmaps_intent, xmi_list);
279}
280
281/* Cancel a deferred file mapping exchange. */
282STATIC void
283xfs_exchmaps_cancel_item(
284 struct list_head *item)
285{
286 struct xfs_exchmaps_intent *xmi = xmi_entry(item);
287
288 kmem_cache_free(xfs_exchmaps_intent_cache, xmi);
289}
290
291/* Process a deferred file mapping exchange. */
292STATIC int
293xfs_exchmaps_finish_item(
294 struct xfs_trans *tp,
295 struct xfs_log_item *done,
296 struct list_head *item,
297 struct xfs_btree_cur **state)
298{
299 struct xfs_exchmaps_intent *xmi = xmi_entry(item);
300 int error;
301
302 /*
303 * Exchange one more mappings between two files. If there's still more
304 * work to do, we want to requeue ourselves after all other pending
305 * deferred operations have finished. This includes all of the dfops
306 * that we queued directly as well as any new ones created in the
307 * process of finishing the others. Doing so prevents us from queuing
308 * a large number of XMI log items in kernel memory, which in turn
309 * prevents us from pinning the tail of the log (while logging those
310 * new XMI items) until the first XMI items can be processed.
311 */
312 error = xfs_exchmaps_finish_one(tp, xmi);
313 if (error != -EAGAIN)
314 xfs_exchmaps_cancel_item(item);
315 return error;
316}
317
318/* Abort all pending XMIs. */
319STATIC void
320xfs_exchmaps_abort_intent(
321 struct xfs_log_item *intent)
322{
323 xfs_xmi_release(XMI_ITEM(intent));
324}
325
326/* Is this recovered XMI ok? */
327static inline bool
328xfs_xmi_validate(
329 struct xfs_mount *mp,
330 struct xfs_xmi_log_item *xmi_lip)
331{
332 struct xfs_xmi_log_format *xlf = &xmi_lip->xmi_format;
333
334 if (!xfs_has_exchange_range(mp))
335 return false;
336
337 if (xmi_lip->xmi_format.__pad != 0)
338 return false;
339
340 if (xlf->xmi_flags & ~XFS_EXCHMAPS_LOGGED_FLAGS)
341 return false;
342
343 if (!xfs_verify_ino(mp, xlf->xmi_inode1) ||
344 !xfs_verify_ino(mp, xlf->xmi_inode2))
345 return false;
346
347 if (!xfs_verify_fileext(mp, xlf->xmi_startoff1, xlf->xmi_blockcount))
348 return false;
349
350 return xfs_verify_fileext(mp, xlf->xmi_startoff2, xlf->xmi_blockcount);
351}
352
353/*
354 * Use the recovered log state to create a new request, estimate resource
355 * requirements, and create a new incore intent state.
356 */
357STATIC struct xfs_exchmaps_intent *
358xfs_xmi_item_recover_intent(
359 struct xfs_mount *mp,
360 struct xfs_defer_pending *dfp,
361 const struct xfs_xmi_log_format *xlf,
362 struct xfs_exchmaps_req *req,
363 struct xfs_inode **ipp1,
364 struct xfs_inode **ipp2)
365{
366 struct xfs_inode *ip1, *ip2;
367 struct xfs_exchmaps_intent *xmi;
368 int error;
369
370 /*
371 * Grab both inodes and set IRECOVERY to prevent trimming of post-eof
372 * mappings and freeing of unlinked inodes until we're totally done
373 * processing files. The ondisk format of this new log item contains
374 * file handle information, which is why recovery for other items do
375 * not check the inode generation number.
376 */
377 error = xlog_recover_iget_handle(mp, xlf->xmi_inode1, xlf->xmi_igen1,
378 &ip1);
379 if (error) {
380 XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, xlf,
381 sizeof(*xlf));
382 return ERR_PTR(error);
383 }
384
385 error = xlog_recover_iget_handle(mp, xlf->xmi_inode2, xlf->xmi_igen2,
386 &ip2);
387 if (error) {
388 XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, xlf,
389 sizeof(*xlf));
390 goto err_rele1;
391 }
392
393 req->ip1 = ip1;
394 req->ip2 = ip2;
395 req->startoff1 = xlf->xmi_startoff1;
396 req->startoff2 = xlf->xmi_startoff2;
397 req->blockcount = xlf->xmi_blockcount;
398 req->flags = xlf->xmi_flags & XFS_EXCHMAPS_PARAMS;
399
400 xfs_exchrange_ilock(NULL, ip1, ip2);
401 error = xfs_exchmaps_estimate(req);
402 xfs_exchrange_iunlock(ip1, ip2);
403 if (error)
404 goto err_rele2;
405
406 *ipp1 = ip1;
407 *ipp2 = ip2;
408 xmi = xfs_exchmaps_init_intent(req);
409 xfs_defer_add_item(dfp, &xmi->xmi_list);
410 return xmi;
411
412err_rele2:
413 xfs_irele(ip2);
414err_rele1:
415 xfs_irele(ip1);
416 req->ip2 = req->ip1 = NULL;
417 return ERR_PTR(error);
418}
419
420/* Process a file mapping exchange item that was recovered from the log. */
421STATIC int
422xfs_exchmaps_recover_work(
423 struct xfs_defer_pending *dfp,
424 struct list_head *capture_list)
425{
426 struct xfs_exchmaps_req req = { .flags = 0 };
427 struct xfs_trans_res resv;
428 struct xfs_exchmaps_intent *xmi;
429 struct xfs_log_item *lip = dfp->dfp_intent;
430 struct xfs_xmi_log_item *xmi_lip = XMI_ITEM(lip);
431 struct xfs_mount *mp = lip->li_log->l_mp;
432 struct xfs_trans *tp;
433 struct xfs_inode *ip1, *ip2;
434 int error = 0;
435
436 if (!xfs_xmi_validate(mp, xmi_lip)) {
437 XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp,
438 &xmi_lip->xmi_format,
439 sizeof(xmi_lip->xmi_format));
440 return -EFSCORRUPTED;
441 }
442
443 xmi = xfs_xmi_item_recover_intent(mp, dfp, &xmi_lip->xmi_format, &req,
444 &ip1, &ip2);
445 if (IS_ERR(xmi))
446 return PTR_ERR(xmi);
447
448 trace_xfs_exchmaps_recover(mp, xmi);
449
450 resv = xlog_recover_resv(&M_RES(mp)->tr_write);
451 error = xfs_trans_alloc(mp, &resv, req.resblks, 0, 0, &tp);
452 if (error)
453 goto err_rele;
454
455 xfs_exchrange_ilock(tp, ip1, ip2);
456
457 xfs_exchmaps_ensure_reflink(tp, xmi);
458 xfs_exchmaps_upgrade_extent_counts(tp, xmi);
459 error = xlog_recover_finish_intent(tp, dfp);
460 if (error == -EFSCORRUPTED)
461 XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp,
462 &xmi_lip->xmi_format,
463 sizeof(xmi_lip->xmi_format));
464 if (error)
465 goto err_cancel;
466
467 /*
468 * Commit transaction, which frees the transaction and saves the inodes
469 * for later replay activities.
470 */
471 error = xfs_defer_ops_capture_and_commit(tp, capture_list);
472 goto err_unlock;
473
474err_cancel:
475 xfs_trans_cancel(tp);
476err_unlock:
477 xfs_exchrange_iunlock(ip1, ip2);
478err_rele:
479 xfs_irele(ip2);
480 xfs_irele(ip1);
481 return error;
482}
483
484/* Relog an intent item to push the log tail forward. */
485static struct xfs_log_item *
486xfs_exchmaps_relog_intent(
487 struct xfs_trans *tp,
488 struct xfs_log_item *intent,
489 struct xfs_log_item *done_item)
490{
491 struct xfs_xmi_log_item *xmi_lip;
492 struct xfs_xmi_log_format *old_xlf, *new_xlf;
493
494 old_xlf = &XMI_ITEM(intent)->xmi_format;
495
496 xmi_lip = xfs_xmi_init(tp->t_mountp);
497 new_xlf = &xmi_lip->xmi_format;
498
499 new_xlf->xmi_inode1 = old_xlf->xmi_inode1;
500 new_xlf->xmi_inode2 = old_xlf->xmi_inode2;
501 new_xlf->xmi_igen1 = old_xlf->xmi_igen1;
502 new_xlf->xmi_igen2 = old_xlf->xmi_igen2;
503 new_xlf->xmi_startoff1 = old_xlf->xmi_startoff1;
504 new_xlf->xmi_startoff2 = old_xlf->xmi_startoff2;
505 new_xlf->xmi_blockcount = old_xlf->xmi_blockcount;
506 new_xlf->xmi_flags = old_xlf->xmi_flags;
507 new_xlf->xmi_isize1 = old_xlf->xmi_isize1;
508 new_xlf->xmi_isize2 = old_xlf->xmi_isize2;
509
510 return &xmi_lip->xmi_item;
511}
512
513const struct xfs_defer_op_type xfs_exchmaps_defer_type = {
514 .name = "exchmaps",
515 .max_items = 1,
516 .create_intent = xfs_exchmaps_create_intent,
517 .abort_intent = xfs_exchmaps_abort_intent,
518 .create_done = xfs_exchmaps_create_done,
519 .finish_item = xfs_exchmaps_finish_item,
520 .cancel_item = xfs_exchmaps_cancel_item,
521 .recover_work = xfs_exchmaps_recover_work,
522 .relog_intent = xfs_exchmaps_relog_intent,
523};
524
525STATIC bool
526xfs_xmi_item_match(
527 struct xfs_log_item *lip,
528 uint64_t intent_id)
529{
530 return XMI_ITEM(lip)->xmi_format.xmi_id == intent_id;
531}
532
533static const struct xfs_item_ops xfs_xmi_item_ops = {
534 .flags = XFS_ITEM_INTENT,
535 .iop_size = xfs_xmi_item_size,
536 .iop_format = xfs_xmi_item_format,
537 .iop_unpin = xfs_xmi_item_unpin,
538 .iop_release = xfs_xmi_item_release,
539 .iop_match = xfs_xmi_item_match,
540};
541
542/*
543 * This routine is called to create an in-core file mapping exchange item from
544 * the xmi format structure which was logged on disk. It allocates an in-core
545 * xmi, copies the exchange information from the format structure into it, and
546 * adds the xmi to the AIL with the given LSN.
547 */
548STATIC int
549xlog_recover_xmi_commit_pass2(
550 struct xlog *log,
551 struct list_head *buffer_list,
552 struct xlog_recover_item *item,
553 xfs_lsn_t lsn)
554{
555 struct xfs_mount *mp = log->l_mp;
556 struct xfs_xmi_log_item *xmi_lip;
557 struct xfs_xmi_log_format *xmi_formatp;
558 size_t len;
559
560 len = sizeof(struct xfs_xmi_log_format);
561 if (item->ri_buf[0].i_len != len) {
562 XFS_ERROR_REPORT(__func__, XFS_ERRLEVEL_LOW, log->l_mp);
563 return -EFSCORRUPTED;
564 }
565
566 xmi_formatp = item->ri_buf[0].i_addr;
567 if (xmi_formatp->__pad != 0) {
568 XFS_ERROR_REPORT(__func__, XFS_ERRLEVEL_LOW, log->l_mp);
569 return -EFSCORRUPTED;
570 }
571
572 xmi_lip = xfs_xmi_init(mp);
573 memcpy(&xmi_lip->xmi_format, xmi_formatp, len);
574
575 xlog_recover_intent_item(log, &xmi_lip->xmi_item, lsn,
576 &xfs_exchmaps_defer_type);
577 return 0;
578}
579
580const struct xlog_recover_item_ops xlog_xmi_item_ops = {
581 .item_type = XFS_LI_XMI,
582 .commit_pass2 = xlog_recover_xmi_commit_pass2,
583};
584
585/*
586 * This routine is called when an XMD format structure is found in a committed
587 * transaction in the log. Its purpose is to cancel the corresponding XMI if it
588 * was still in the log. To do this it searches the AIL for the XMI with an id
589 * equal to that in the XMD format structure. If we find it we drop the XMD
590 * reference, which removes the XMI from the AIL and frees it.
591 */
592STATIC int
593xlog_recover_xmd_commit_pass2(
594 struct xlog *log,
595 struct list_head *buffer_list,
596 struct xlog_recover_item *item,
597 xfs_lsn_t lsn)
598{
599 struct xfs_xmd_log_format *xmd_formatp;
600
601 xmd_formatp = item->ri_buf[0].i_addr;
602 if (item->ri_buf[0].i_len != sizeof(struct xfs_xmd_log_format)) {
603 XFS_ERROR_REPORT(__func__, XFS_ERRLEVEL_LOW, log->l_mp);
604 return -EFSCORRUPTED;
605 }
606
607 xlog_recover_release_intent(log, XFS_LI_XMI, xmd_formatp->xmd_xmi_id);
608 return 0;
609}
610
611const struct xlog_recover_item_ops xlog_xmd_item_ops = {
612 .item_type = XFS_LI_XMD,
613 .commit_pass2 = xlog_recover_xmd_commit_pass2,
614};