1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Copyright (c) 2000-2006 Silicon Graphics, Inc.
4  * All Rights Reserved.
5  */
6 #include "xfs.h"
7 #include "xfs_fs.h"
8 #include "xfs_shared.h"
9 #include "xfs_format.h"
10 #include "xfs_log_format.h"
11 #include "xfs_trans_resv.h"
12 #include "xfs_mount.h"
13 #include "xfs_inode.h"
14 #include "xfs_trans.h"
15 #include "xfs_inode_item.h"
16 #include "xfs_trace.h"
17 #include "xfs_trans_priv.h"
18 #include "xfs_buf_item.h"
19 #include "xfs_log.h"
20 #include "xfs_error.h"
21 #include "xfs_log_priv.h"
22 #include "xfs_log_recover.h"
23 #include "xfs_icache.h"
24 #include "xfs_bmap_btree.h"
25 
26 STATIC void
27 xlog_recover_inode_ra_pass2(
28 	struct xlog                     *log,
29 	struct xlog_recover_item        *item)
30 {
31 	if (item->ri_buf[0].i_len == sizeof(struct xfs_inode_log_format)) {
32 		struct xfs_inode_log_format	*ilfp = item->ri_buf[0].i_addr;
33 
34 		xlog_buf_readahead(log, ilfp->ilf_blkno, ilfp->ilf_len,
35 				   &xfs_inode_buf_ra_ops);
36 	} else {
37 		struct xfs_inode_log_format_32	*ilfp = item->ri_buf[0].i_addr;
38 
39 		xlog_buf_readahead(log, ilfp->ilf_blkno, ilfp->ilf_len,
40 				   &xfs_inode_buf_ra_ops);
41 	}
42 }
43 
44 /*
45  * Inode fork owner changes
46  *
47  * If we have been told that we have to reparent the inode fork, it's because an
48  * extent swap operation on a CRC enabled filesystem has been done and we are
49  * replaying it. We need to walk the BMBT of the appropriate fork and change the
50  * owners of it.
51  *
52  * The complexity here is that we don't have an inode context to work with, so
53  * after we've replayed the inode we need to instantiate one.  This is where the
54  * fun begins.
55  *
56  * We are in the middle of log recovery, so we can't run transactions. That
57  * means we cannot use cache coherent inode instantiation via xfs_iget(), as
58  * that will result in the corresponding iput() running the inode through
59  * xfs_inactive(). If we've just replayed an inode core that changes the link
60  * count to zero (i.e. it's been unlinked), then xfs_inactive() will run
61  * transactions (bad!).
62  *
63  * So, to avoid this, we instantiate an inode directly from the inode core we've
64  * just recovered. We have the buffer still locked, and all we really need to
65  * instantiate is the inode core and the forks being modified. We can do this
66  * manually, then run the inode btree owner change, and then tear down the
67  * xfs_inode without having to run any transactions at all.
68  *
69  * Also, because we don't have a transaction context available here but need to
70  * gather all the buffers we modify for writeback so we pass the buffer_list
71  * instead for the operation to use.
72  */
73 
74 STATIC int
75 xfs_recover_inode_owner_change(
76 	struct xfs_mount	*mp,
77 	struct xfs_dinode	*dip,
78 	struct xfs_inode_log_format *in_f,
79 	struct list_head	*buffer_list)
80 {
81 	struct xfs_inode	*ip;
82 	int			error;
83 
84 	ASSERT(in_f->ilf_fields & (XFS_ILOG_DOWNER|XFS_ILOG_AOWNER));
85 
86 	ip = xfs_inode_alloc(mp, in_f->ilf_ino);
87 	if (!ip)
88 		return -ENOMEM;
89 
90 	/* instantiate the inode */
91 	ASSERT(dip->di_version >= 3);
92 
93 	error = xfs_inode_from_disk(ip, dip);
94 	if (error)
95 		goto out_free_ip;
96 
97 	if (in_f->ilf_fields & XFS_ILOG_DOWNER) {
98 		ASSERT(in_f->ilf_fields & XFS_ILOG_DBROOT);
99 		error = xfs_bmbt_change_owner(NULL, ip, XFS_DATA_FORK,
100 					      ip->i_ino, buffer_list);
101 		if (error)
102 			goto out_free_ip;
103 	}
104 
105 	if (in_f->ilf_fields & XFS_ILOG_AOWNER) {
106 		ASSERT(in_f->ilf_fields & XFS_ILOG_ABROOT);
107 		error = xfs_bmbt_change_owner(NULL, ip, XFS_ATTR_FORK,
108 					      ip->i_ino, buffer_list);
109 		if (error)
110 			goto out_free_ip;
111 	}
112 
113 out_free_ip:
114 	xfs_inode_free(ip);
115 	return error;
116 }
117 
118 static inline bool xfs_log_dinode_has_bigtime(const struct xfs_log_dinode *ld)
119 {
120 	return ld->di_version >= 3 &&
121 	       (ld->di_flags2 & XFS_DIFLAG2_BIGTIME);
122 }
123 
124 /* Convert a log timestamp to an ondisk timestamp. */
125 static inline xfs_timestamp_t
126 xfs_log_dinode_to_disk_ts(
127 	struct xfs_log_dinode		*from,
128 	const xfs_log_timestamp_t	its)
129 {
130 	struct xfs_legacy_timestamp	*lts;
131 	struct xfs_log_legacy_timestamp	*lits;
132 	xfs_timestamp_t			ts;
133 
134 	if (xfs_log_dinode_has_bigtime(from))
135 		return cpu_to_be64(its);
136 
137 	lts = (struct xfs_legacy_timestamp *)&ts;
138 	lits = (struct xfs_log_legacy_timestamp *)&its;
139 	lts->t_sec = cpu_to_be32(lits->t_sec);
140 	lts->t_nsec = cpu_to_be32(lits->t_nsec);
141 
142 	return ts;
143 }
144 
145 static inline bool xfs_log_dinode_has_large_extent_counts(
146 		const struct xfs_log_dinode *ld)
147 {
148 	return ld->di_version >= 3 &&
149 	       (ld->di_flags2 & XFS_DIFLAG2_NREXT64);
150 }
151 
152 static inline void
153 xfs_log_dinode_to_disk_iext_counters(
154 	struct xfs_log_dinode	*from,
155 	struct xfs_dinode	*to)
156 {
157 	if (xfs_log_dinode_has_large_extent_counts(from)) {
158 		to->di_big_nextents = cpu_to_be64(from->di_big_nextents);
159 		to->di_big_anextents = cpu_to_be32(from->di_big_anextents);
160 		to->di_nrext64_pad = cpu_to_be16(from->di_nrext64_pad);
161 	} else {
162 		to->di_nextents = cpu_to_be32(from->di_nextents);
163 		to->di_anextents = cpu_to_be16(from->di_anextents);
164 	}
165 
166 }
167 
168 STATIC void
169 xfs_log_dinode_to_disk(
170 	struct xfs_log_dinode	*from,
171 	struct xfs_dinode	*to,
172 	xfs_lsn_t		lsn)
173 {
174 	to->di_magic = cpu_to_be16(from->di_magic);
175 	to->di_mode = cpu_to_be16(from->di_mode);
176 	to->di_version = from->di_version;
177 	to->di_format = from->di_format;
178 	to->di_onlink = 0;
179 	to->di_uid = cpu_to_be32(from->di_uid);
180 	to->di_gid = cpu_to_be32(from->di_gid);
181 	to->di_nlink = cpu_to_be32(from->di_nlink);
182 	to->di_projid_lo = cpu_to_be16(from->di_projid_lo);
183 	to->di_projid_hi = cpu_to_be16(from->di_projid_hi);
184 
185 	to->di_atime = xfs_log_dinode_to_disk_ts(from, from->di_atime);
186 	to->di_mtime = xfs_log_dinode_to_disk_ts(from, from->di_mtime);
187 	to->di_ctime = xfs_log_dinode_to_disk_ts(from, from->di_ctime);
188 
189 	to->di_size = cpu_to_be64(from->di_size);
190 	to->di_nblocks = cpu_to_be64(from->di_nblocks);
191 	to->di_extsize = cpu_to_be32(from->di_extsize);
192 	to->di_forkoff = from->di_forkoff;
193 	to->di_aformat = from->di_aformat;
194 	to->di_dmevmask = cpu_to_be32(from->di_dmevmask);
195 	to->di_dmstate = cpu_to_be16(from->di_dmstate);
196 	to->di_flags = cpu_to_be16(from->di_flags);
197 	to->di_gen = cpu_to_be32(from->di_gen);
198 
199 	if (from->di_version == 3) {
200 		to->di_changecount = cpu_to_be64(from->di_changecount);
201 		to->di_crtime = xfs_log_dinode_to_disk_ts(from,
202 							  from->di_crtime);
203 		to->di_flags2 = cpu_to_be64(from->di_flags2);
204 		to->di_cowextsize = cpu_to_be32(from->di_cowextsize);
205 		to->di_ino = cpu_to_be64(from->di_ino);
206 		to->di_lsn = cpu_to_be64(lsn);
207 		memset(to->di_pad2, 0, sizeof(to->di_pad2));
208 		uuid_copy(&to->di_uuid, &from->di_uuid);
209 		to->di_v3_pad = 0;
210 	} else {
211 		to->di_flushiter = cpu_to_be16(from->di_flushiter);
212 		memset(to->di_v2_pad, 0, sizeof(to->di_v2_pad));
213 	}
214 
215 	xfs_log_dinode_to_disk_iext_counters(from, to);
216 }
217 
218 STATIC int
219 xlog_dinode_verify_extent_counts(
220 	struct xfs_mount	*mp,
221 	struct xfs_log_dinode	*ldip)
222 {
223 	xfs_extnum_t		nextents;
224 	xfs_aextnum_t		anextents;
225 
226 	if (xfs_log_dinode_has_large_extent_counts(ldip)) {
227 		if (!xfs_has_large_extent_counts(mp) ||
228 		    (ldip->di_nrext64_pad != 0)) {
229 			XFS_CORRUPTION_ERROR(
230 				"Bad log dinode large extent count format",
231 				XFS_ERRLEVEL_LOW, mp, ldip, sizeof(*ldip));
232 			xfs_alert(mp,
233 				"Bad inode 0x%llx, large extent counts %d, padding 0x%x",
234 				ldip->di_ino, xfs_has_large_extent_counts(mp),
235 				ldip->di_nrext64_pad);
236 			return -EFSCORRUPTED;
237 		}
238 
239 		nextents = ldip->di_big_nextents;
240 		anextents = ldip->di_big_anextents;
241 	} else {
242 		if (ldip->di_version == 3 && ldip->di_v3_pad != 0) {
243 			XFS_CORRUPTION_ERROR(
244 				"Bad log dinode di_v3_pad",
245 				XFS_ERRLEVEL_LOW, mp, ldip, sizeof(*ldip));
246 			xfs_alert(mp,
247 				"Bad inode 0x%llx, di_v3_pad 0x%llx",
248 				ldip->di_ino, ldip->di_v3_pad);
249 			return -EFSCORRUPTED;
250 		}
251 
252 		nextents = ldip->di_nextents;
253 		anextents = ldip->di_anextents;
254 	}
255 
256 	if (unlikely(nextents + anextents > ldip->di_nblocks)) {
257 		XFS_CORRUPTION_ERROR("Bad log dinode extent counts",
258 				XFS_ERRLEVEL_LOW, mp, ldip, sizeof(*ldip));
259 		xfs_alert(mp,
260 			"Bad inode 0x%llx, large extent counts %d, nextents 0x%llx, anextents 0x%x, nblocks 0x%llx",
261 			ldip->di_ino, xfs_has_large_extent_counts(mp), nextents,
262 			anextents, ldip->di_nblocks);
263 		return -EFSCORRUPTED;
264 	}
265 
266 	return 0;
267 }
268 
269 STATIC int
270 xlog_recover_inode_commit_pass2(
271 	struct xlog			*log,
272 	struct list_head		*buffer_list,
273 	struct xlog_recover_item	*item,
274 	xfs_lsn_t			current_lsn)
275 {
276 	struct xfs_inode_log_format	*in_f;
277 	struct xfs_mount		*mp = log->l_mp;
278 	struct xfs_buf			*bp;
279 	struct xfs_dinode		*dip;
280 	int				len;
281 	char				*src;
282 	char				*dest;
283 	int				error;
284 	int				attr_index;
285 	uint				fields;
286 	struct xfs_log_dinode		*ldip;
287 	uint				isize;
288 	int				need_free = 0;
289 
290 	if (item->ri_buf[0].i_len == sizeof(struct xfs_inode_log_format)) {
291 		in_f = item->ri_buf[0].i_addr;
292 	} else {
293 		in_f = kmem_alloc(sizeof(struct xfs_inode_log_format), 0);
294 		need_free = 1;
295 		error = xfs_inode_item_format_convert(&item->ri_buf[0], in_f);
296 		if (error)
297 			goto error;
298 	}
299 
300 	/*
301 	 * Inode buffers can be freed, look out for it,
302 	 * and do not replay the inode.
303 	 */
304 	if (xlog_is_buffer_cancelled(log, in_f->ilf_blkno, in_f->ilf_len)) {
305 		error = 0;
306 		trace_xfs_log_recover_inode_cancel(log, in_f);
307 		goto error;
308 	}
309 	trace_xfs_log_recover_inode_recover(log, in_f);
310 
311 	error = xfs_buf_read(mp->m_ddev_targp, in_f->ilf_blkno, in_f->ilf_len,
312 			0, &bp, &xfs_inode_buf_ops);
313 	if (error)
314 		goto error;
315 	ASSERT(in_f->ilf_fields & XFS_ILOG_CORE);
316 	dip = xfs_buf_offset(bp, in_f->ilf_boffset);
317 
318 	/*
319 	 * Make sure the place we're flushing out to really looks
320 	 * like an inode!
321 	 */
322 	if (XFS_IS_CORRUPT(mp, !xfs_verify_magic16(bp, dip->di_magic))) {
323 		xfs_alert(mp,
324 	"%s: Bad inode magic number, dip = "PTR_FMT", dino bp = "PTR_FMT", ino = %lld",
325 			__func__, dip, bp, in_f->ilf_ino);
326 		error = -EFSCORRUPTED;
327 		goto out_release;
328 	}
329 	ldip = item->ri_buf[1].i_addr;
330 	if (XFS_IS_CORRUPT(mp, ldip->di_magic != XFS_DINODE_MAGIC)) {
331 		xfs_alert(mp,
332 			"%s: Bad inode log record, rec ptr "PTR_FMT", ino %lld",
333 			__func__, item, in_f->ilf_ino);
334 		error = -EFSCORRUPTED;
335 		goto out_release;
336 	}
337 
338 	/*
339 	 * If the inode has an LSN in it, recover the inode only if the on-disk
340 	 * inode's LSN is older than the lsn of the transaction we are
341 	 * replaying. We can have multiple checkpoints with the same start LSN,
342 	 * so the current LSN being equal to the on-disk LSN doesn't necessarily
343 	 * mean that the on-disk inode is more recent than the change being
344 	 * replayed.
345 	 *
346 	 * We must check the current_lsn against the on-disk inode
347 	 * here because the we can't trust the log dinode to contain a valid LSN
348 	 * (see comment below before replaying the log dinode for details).
349 	 *
350 	 * Note: we still need to replay an owner change even though the inode
351 	 * is more recent than the transaction as there is no guarantee that all
352 	 * the btree blocks are more recent than this transaction, too.
353 	 */
354 	if (dip->di_version >= 3) {
355 		xfs_lsn_t	lsn = be64_to_cpu(dip->di_lsn);
356 
357 		if (lsn && lsn != -1 && XFS_LSN_CMP(lsn, current_lsn) > 0) {
358 			trace_xfs_log_recover_inode_skip(log, in_f);
359 			error = 0;
360 			goto out_owner_change;
361 		}
362 	}
363 
364 	/*
365 	 * di_flushiter is only valid for v1/2 inodes. All changes for v3 inodes
366 	 * are transactional and if ordering is necessary we can determine that
367 	 * more accurately by the LSN field in the V3 inode core. Don't trust
368 	 * the inode versions we might be changing them here - use the
369 	 * superblock flag to determine whether we need to look at di_flushiter
370 	 * to skip replay when the on disk inode is newer than the log one
371 	 */
372 	if (!xfs_has_v3inodes(mp) &&
373 	    ldip->di_flushiter < be16_to_cpu(dip->di_flushiter)) {
374 		/*
375 		 * Deal with the wrap case, DI_MAX_FLUSH is less
376 		 * than smaller numbers
377 		 */
378 		if (be16_to_cpu(dip->di_flushiter) == DI_MAX_FLUSH &&
379 		    ldip->di_flushiter < (DI_MAX_FLUSH >> 1)) {
380 			/* do nothing */
381 		} else {
382 			trace_xfs_log_recover_inode_skip(log, in_f);
383 			error = 0;
384 			goto out_release;
385 		}
386 	}
387 
388 	/* Take the opportunity to reset the flush iteration count */
389 	ldip->di_flushiter = 0;
390 
391 	if (unlikely(S_ISREG(ldip->di_mode))) {
392 		if ((ldip->di_format != XFS_DINODE_FMT_EXTENTS) &&
393 		    (ldip->di_format != XFS_DINODE_FMT_BTREE)) {
394 			XFS_CORRUPTION_ERROR(
395 				"Bad log dinode data fork format for regular file",
396 				XFS_ERRLEVEL_LOW, mp, ldip, sizeof(*ldip));
397 			xfs_alert(mp,
398 				"Bad inode 0x%llx, data fork format 0x%x",
399 				in_f->ilf_ino, ldip->di_format);
400 			error = -EFSCORRUPTED;
401 			goto out_release;
402 		}
403 	} else if (unlikely(S_ISDIR(ldip->di_mode))) {
404 		if ((ldip->di_format != XFS_DINODE_FMT_EXTENTS) &&
405 		    (ldip->di_format != XFS_DINODE_FMT_BTREE) &&
406 		    (ldip->di_format != XFS_DINODE_FMT_LOCAL)) {
407 			XFS_CORRUPTION_ERROR(
408 				"Bad log dinode data fork format for directory",
409 				XFS_ERRLEVEL_LOW, mp, ldip, sizeof(*ldip));
410 			xfs_alert(mp,
411 				"Bad inode 0x%llx, data fork format 0x%x",
412 				in_f->ilf_ino, ldip->di_format);
413 			error = -EFSCORRUPTED;
414 			goto out_release;
415 		}
416 	}
417 
418 	error = xlog_dinode_verify_extent_counts(mp, ldip);
419 	if (error)
420 		goto out_release;
421 
422 	if (unlikely(ldip->di_forkoff > mp->m_sb.sb_inodesize)) {
423 		XFS_CORRUPTION_ERROR("Bad log dinode fork offset",
424 				XFS_ERRLEVEL_LOW, mp, ldip, sizeof(*ldip));
425 		xfs_alert(mp,
426 			"Bad inode 0x%llx, di_forkoff 0x%x",
427 			in_f->ilf_ino, ldip->di_forkoff);
428 		error = -EFSCORRUPTED;
429 		goto out_release;
430 	}
431 	isize = xfs_log_dinode_size(mp);
432 	if (unlikely(item->ri_buf[1].i_len > isize)) {
433 		XFS_CORRUPTION_ERROR("Bad log dinode size", XFS_ERRLEVEL_LOW,
434 				     mp, ldip, sizeof(*ldip));
435 		xfs_alert(mp,
436 			"Bad inode 0x%llx log dinode size 0x%x",
437 			in_f->ilf_ino, item->ri_buf[1].i_len);
438 		error = -EFSCORRUPTED;
439 		goto out_release;
440 	}
441 
442 	/*
443 	 * Recover the log dinode inode into the on disk inode.
444 	 *
445 	 * The LSN in the log dinode is garbage - it can be zero or reflect
446 	 * stale in-memory runtime state that isn't coherent with the changes
447 	 * logged in this transaction or the changes written to the on-disk
448 	 * inode.  Hence we write the current lSN into the inode because that
449 	 * matches what xfs_iflush() would write inode the inode when flushing
450 	 * the changes in this transaction.
451 	 */
452 	xfs_log_dinode_to_disk(ldip, dip, current_lsn);
453 
454 	fields = in_f->ilf_fields;
455 	if (fields & XFS_ILOG_DEV)
456 		xfs_dinode_put_rdev(dip, in_f->ilf_u.ilfu_rdev);
457 
458 	if (in_f->ilf_size == 2)
459 		goto out_owner_change;
460 	len = item->ri_buf[2].i_len;
461 	src = item->ri_buf[2].i_addr;
462 	ASSERT(in_f->ilf_size <= 4);
463 	ASSERT((in_f->ilf_size == 3) || (fields & XFS_ILOG_AFORK));
464 	ASSERT(!(fields & XFS_ILOG_DFORK) ||
465 	       (len == xlog_calc_iovec_len(in_f->ilf_dsize)));
466 
467 	switch (fields & XFS_ILOG_DFORK) {
468 	case XFS_ILOG_DDATA:
469 	case XFS_ILOG_DEXT:
470 		memcpy(XFS_DFORK_DPTR(dip), src, len);
471 		break;
472 
473 	case XFS_ILOG_DBROOT:
474 		xfs_bmbt_to_bmdr(mp, (struct xfs_btree_block *)src, len,
475 				 (struct xfs_bmdr_block *)XFS_DFORK_DPTR(dip),
476 				 XFS_DFORK_DSIZE(dip, mp));
477 		break;
478 
479 	default:
480 		/*
481 		 * There are no data fork flags set.
482 		 */
483 		ASSERT((fields & XFS_ILOG_DFORK) == 0);
484 		break;
485 	}
486 
487 	/*
488 	 * If we logged any attribute data, recover it.  There may or
489 	 * may not have been any other non-core data logged in this
490 	 * transaction.
491 	 */
492 	if (in_f->ilf_fields & XFS_ILOG_AFORK) {
493 		if (in_f->ilf_fields & XFS_ILOG_DFORK) {
494 			attr_index = 3;
495 		} else {
496 			attr_index = 2;
497 		}
498 		len = item->ri_buf[attr_index].i_len;
499 		src = item->ri_buf[attr_index].i_addr;
500 		ASSERT(len == xlog_calc_iovec_len(in_f->ilf_asize));
501 
502 		switch (in_f->ilf_fields & XFS_ILOG_AFORK) {
503 		case XFS_ILOG_ADATA:
504 		case XFS_ILOG_AEXT:
505 			dest = XFS_DFORK_APTR(dip);
506 			ASSERT(len <= XFS_DFORK_ASIZE(dip, mp));
507 			memcpy(dest, src, len);
508 			break;
509 
510 		case XFS_ILOG_ABROOT:
511 			dest = XFS_DFORK_APTR(dip);
512 			xfs_bmbt_to_bmdr(mp, (struct xfs_btree_block *)src,
513 					 len, (struct xfs_bmdr_block *)dest,
514 					 XFS_DFORK_ASIZE(dip, mp));
515 			break;
516 
517 		default:
518 			xfs_warn(log->l_mp, "%s: Invalid flag", __func__);
519 			ASSERT(0);
520 			error = -EFSCORRUPTED;
521 			goto out_release;
522 		}
523 	}
524 
525 out_owner_change:
526 	/* Recover the swapext owner change unless inode has been deleted */
527 	if ((in_f->ilf_fields & (XFS_ILOG_DOWNER|XFS_ILOG_AOWNER)) &&
528 	    (dip->di_mode != 0))
529 		error = xfs_recover_inode_owner_change(mp, dip, in_f,
530 						       buffer_list);
531 	/* re-generate the checksum. */
532 	xfs_dinode_calc_crc(log->l_mp, dip);
533 
534 	ASSERT(bp->b_mount == mp);
535 	bp->b_flags |= _XBF_LOGRECOVERY;
536 	xfs_buf_delwri_queue(bp, buffer_list);
537 
538 out_release:
539 	xfs_buf_relse(bp);
540 error:
541 	if (need_free)
542 		kmem_free(in_f);
543 	return error;
544 }
545 
546 const struct xlog_recover_item_ops xlog_inode_item_ops = {
547 	.item_type		= XFS_LI_INODE,
548 	.ra_pass2		= xlog_recover_inode_ra_pass2,
549 	.commit_pass2		= xlog_recover_inode_commit_pass2,
550 };
551