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v6.2
  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_ag.h"
 14#include "xfs_inode.h"
 15#include "xfs_errortag.h"
 16#include "xfs_error.h"
 
 17#include "xfs_icache.h"
 18#include "xfs_trans.h"
 19#include "xfs_ialloc.h"
 20#include "xfs_dir2.h"
 21
 22#include <linux/iversion.h>
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 23
 24/*
 25 * If we are doing readahead on an inode buffer, we might be in log recovery
 26 * reading an inode allocation buffer that hasn't yet been replayed, and hence
 27 * has not had the inode cores stamped into it. Hence for readahead, the buffer
 28 * may be potentially invalid.
 29 *
 30 * If the readahead buffer is invalid, we need to mark it with an error and
 31 * clear the DONE status of the buffer so that a followup read will re-read it
 32 * from disk. We don't report the error otherwise to avoid warnings during log
 33 * recovery and we don't get unnecessary panics on debug kernels. We use EIO here
 34 * because all we want to do is say readahead failed; there is no-one to report
 35 * the error to, so this will distinguish it from a non-ra verifier failure.
 36 * Changes to this readahead error behaviour also need to be reflected in
 37 * xfs_dquot_buf_readahead_verify().
 38 */
 39static void
 40xfs_inode_buf_verify(
 41	struct xfs_buf	*bp,
 42	bool		readahead)
 43{
 44	struct xfs_mount *mp = bp->b_mount;
 45	int		i;
 46	int		ni;
 47
 48	/*
 49	 * Validate the magic number and version of every inode in the buffer
 50	 */
 51	ni = XFS_BB_TO_FSB(mp, bp->b_length) * mp->m_sb.sb_inopblock;
 52	for (i = 0; i < ni; i++) {
 53		struct xfs_dinode	*dip;
 54		xfs_agino_t		unlinked_ino;
 55		int			di_ok;
 56
 57		dip = xfs_buf_offset(bp, (i << mp->m_sb.sb_inodelog));
 58		unlinked_ino = be32_to_cpu(dip->di_next_unlinked);
 59		di_ok = xfs_verify_magic16(bp, dip->di_magic) &&
 60			xfs_dinode_good_version(mp, dip->di_version) &&
 61			xfs_verify_agino_or_null(bp->b_pag, unlinked_ino);
 62		if (unlikely(XFS_TEST_ERROR(!di_ok, mp,
 63						XFS_ERRTAG_ITOBP_INOTOBP))) {
 
 64			if (readahead) {
 65				bp->b_flags &= ~XBF_DONE;
 66				xfs_buf_ioerror(bp, -EIO);
 67				return;
 68			}
 69
 
 
 70#ifdef DEBUG
 71			xfs_alert(mp,
 72				"bad inode magic/vsn daddr %lld #%d (magic=%x)",
 73				(unsigned long long)xfs_buf_daddr(bp), i,
 74				be16_to_cpu(dip->di_magic));
 75#endif
 76			xfs_buf_verifier_error(bp, -EFSCORRUPTED,
 77					__func__, dip, sizeof(*dip),
 78					NULL);
 79			return;
 80		}
 81	}
 
 82}
 83
 84
 85static void
 86xfs_inode_buf_read_verify(
 87	struct xfs_buf	*bp)
 88{
 89	xfs_inode_buf_verify(bp, false);
 90}
 91
 92static void
 93xfs_inode_buf_readahead_verify(
 94	struct xfs_buf	*bp)
 95{
 96	xfs_inode_buf_verify(bp, true);
 97}
 98
 99static void
100xfs_inode_buf_write_verify(
101	struct xfs_buf	*bp)
102{
103	xfs_inode_buf_verify(bp, false);
104}
105
106const struct xfs_buf_ops xfs_inode_buf_ops = {
107	.name = "xfs_inode",
108	.magic16 = { cpu_to_be16(XFS_DINODE_MAGIC),
109		     cpu_to_be16(XFS_DINODE_MAGIC) },
110	.verify_read = xfs_inode_buf_read_verify,
111	.verify_write = xfs_inode_buf_write_verify,
112};
113
114const struct xfs_buf_ops xfs_inode_buf_ra_ops = {
115	.name = "xfs_inode_ra",
116	.magic16 = { cpu_to_be16(XFS_DINODE_MAGIC),
117		     cpu_to_be16(XFS_DINODE_MAGIC) },
118	.verify_read = xfs_inode_buf_readahead_verify,
119	.verify_write = xfs_inode_buf_write_verify,
120};
121
122
123/*
124 * This routine is called to map an inode to the buffer containing the on-disk
125 * version of the inode.  It returns a pointer to the buffer containing the
126 * on-disk inode in the bpp parameter.
 
 
 
 
127 */
128int
129xfs_imap_to_bp(
130	struct xfs_mount	*mp,
131	struct xfs_trans	*tp,
132	struct xfs_imap		*imap,
133	struct xfs_buf		**bpp)
134{
135	return xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, imap->im_blkno,
136				   imap->im_len, XBF_UNMAPPED, bpp,
137				   &xfs_inode_buf_ops);
138}
139
140static inline struct timespec64 xfs_inode_decode_bigtime(uint64_t ts)
141{
142	struct timespec64	tv;
143	uint32_t		n;
144
145	tv.tv_sec = xfs_bigtime_to_unix(div_u64_rem(ts, NSEC_PER_SEC, &n));
146	tv.tv_nsec = n;
147
148	return tv;
149}
150
151/* Convert an ondisk timestamp to an incore timestamp. */
152struct timespec64
153xfs_inode_from_disk_ts(
154	struct xfs_dinode		*dip,
155	const xfs_timestamp_t		ts)
156{
157	struct timespec64		tv;
158	struct xfs_legacy_timestamp	*lts;
 
159
160	if (xfs_dinode_has_bigtime(dip))
161		return xfs_inode_decode_bigtime(be64_to_cpu(ts));
 
162
163	lts = (struct xfs_legacy_timestamp *)&ts;
164	tv.tv_sec = (int)be32_to_cpu(lts->t_sec);
165	tv.tv_nsec = (int)be32_to_cpu(lts->t_nsec);
 
166
167	return tv;
 
 
168}
169
170int
171xfs_inode_from_disk(
172	struct xfs_inode	*ip,
173	struct xfs_dinode	*from)
174{
 
175	struct inode		*inode = VFS_I(ip);
176	int			error;
177	xfs_failaddr_t		fa;
178
179	ASSERT(ip->i_cowfp == NULL);
180
181	fa = xfs_dinode_verify(ip->i_mount, ip->i_ino, from);
182	if (fa) {
183		xfs_inode_verifier_error(ip, -EFSCORRUPTED, "dinode", from,
184				sizeof(*from), fa);
185		return -EFSCORRUPTED;
186	}
187
188	/*
189	 * First get the permanent information that is needed to allocate an
190	 * inode. If the inode is unused, mode is zero and we shouldn't mess
191	 * with the uninitialized part of it.
192	 */
193	if (!xfs_has_v3inodes(ip->i_mount))
194		ip->i_flushiter = be16_to_cpu(from->di_flushiter);
195	inode->i_generation = be32_to_cpu(from->di_gen);
196	inode->i_mode = be16_to_cpu(from->di_mode);
197	if (!inode->i_mode)
198		return 0;
199
200	/*
201	 * Convert v1 inodes immediately to v2 inode format as this is the
202	 * minimum inode version format we support in the rest of the code.
203	 * They will also be unconditionally written back to disk as v2 inodes.
204	 */
205	if (unlikely(from->di_version == 1)) {
 
206		set_nlink(inode, be16_to_cpu(from->di_onlink));
207		ip->i_projid = 0;
 
 
208	} else {
209		set_nlink(inode, be32_to_cpu(from->di_nlink));
210		ip->i_projid = (prid_t)be16_to_cpu(from->di_projid_hi) << 16 |
211					be16_to_cpu(from->di_projid_lo);
212	}
213
214	i_uid_write(inode, be32_to_cpu(from->di_uid));
215	i_gid_write(inode, be32_to_cpu(from->di_gid));
 
 
216
217	/*
218	 * Time is signed, so need to convert to signed 32 bit before
219	 * storing in inode timestamp which may be 64 bit. Otherwise
220	 * a time before epoch is converted to a time long after epoch
221	 * on 64 bit systems.
222	 */
223	inode->i_atime = xfs_inode_from_disk_ts(from, from->di_atime);
224	inode->i_mtime = xfs_inode_from_disk_ts(from, from->di_mtime);
225	inode->i_ctime = xfs_inode_from_disk_ts(from, from->di_ctime);
226
227	ip->i_disk_size = be64_to_cpu(from->di_size);
228	ip->i_nblocks = be64_to_cpu(from->di_nblocks);
229	ip->i_extsize = be32_to_cpu(from->di_extsize);
230	ip->i_forkoff = from->di_forkoff;
231	ip->i_diflags = be16_to_cpu(from->di_flags);
232	ip->i_next_unlinked = be32_to_cpu(from->di_next_unlinked);
233
234	if (from->di_dmevmask || from->di_dmstate)
235		xfs_iflags_set(ip, XFS_IPRESERVE_DM_FIELDS);
236
237	if (xfs_has_v3inodes(ip->i_mount)) {
238		inode_set_iversion_queried(inode,
239					   be64_to_cpu(from->di_changecount));
240		ip->i_crtime = xfs_inode_from_disk_ts(from, from->di_crtime);
241		ip->i_diflags2 = be64_to_cpu(from->di_flags2);
242		ip->i_cowextsize = be32_to_cpu(from->di_cowextsize);
243	}
244
245	error = xfs_iformat_data_fork(ip, from);
246	if (error)
247		return error;
248	if (from->di_forkoff) {
249		error = xfs_iformat_attr_fork(ip, from);
250		if (error)
251			goto out_destroy_data_fork;
252	}
253	if (xfs_is_reflink_inode(ip))
254		xfs_ifork_init_cow(ip);
255	return 0;
256
257out_destroy_data_fork:
258	xfs_idestroy_fork(&ip->i_df);
259	return error;
260}
261
262/* Convert an incore timestamp to an ondisk timestamp. */
263static inline xfs_timestamp_t
264xfs_inode_to_disk_ts(
265	struct xfs_inode		*ip,
266	const struct timespec64		tv)
267{
268	struct xfs_legacy_timestamp	*lts;
269	xfs_timestamp_t			ts;
270
271	if (xfs_inode_has_bigtime(ip))
272		return cpu_to_be64(xfs_inode_encode_bigtime(tv));
273
274	lts = (struct xfs_legacy_timestamp *)&ts;
275	lts->t_sec = cpu_to_be32(tv.tv_sec);
276	lts->t_nsec = cpu_to_be32(tv.tv_nsec);
277
278	return ts;
279}
280
281static inline void
282xfs_inode_to_disk_iext_counters(
283	struct xfs_inode	*ip,
284	struct xfs_dinode	*to)
285{
286	if (xfs_inode_has_large_extent_counts(ip)) {
287		to->di_big_nextents = cpu_to_be64(xfs_ifork_nextents(&ip->i_df));
288		to->di_big_anextents = cpu_to_be32(xfs_ifork_nextents(&ip->i_af));
289		/*
290		 * We might be upgrading the inode to use larger extent counters
291		 * than was previously used. Hence zero the unused field.
292		 */
293		to->di_nrext64_pad = cpu_to_be16(0);
294	} else {
295		to->di_nextents = cpu_to_be32(xfs_ifork_nextents(&ip->i_df));
296		to->di_anextents = cpu_to_be16(xfs_ifork_nextents(&ip->i_af));
297	}
298}
299
300void
301xfs_inode_to_disk(
302	struct xfs_inode	*ip,
303	struct xfs_dinode	*to,
304	xfs_lsn_t		lsn)
305{
 
306	struct inode		*inode = VFS_I(ip);
307
308	to->di_magic = cpu_to_be16(XFS_DINODE_MAGIC);
309	to->di_onlink = 0;
310
311	to->di_format = xfs_ifork_format(&ip->i_df);
312	to->di_uid = cpu_to_be32(i_uid_read(inode));
313	to->di_gid = cpu_to_be32(i_gid_read(inode));
314	to->di_projid_lo = cpu_to_be16(ip->i_projid & 0xffff);
315	to->di_projid_hi = cpu_to_be16(ip->i_projid >> 16);
316
317	to->di_atime = xfs_inode_to_disk_ts(ip, inode->i_atime);
318	to->di_mtime = xfs_inode_to_disk_ts(ip, inode->i_mtime);
319	to->di_ctime = xfs_inode_to_disk_ts(ip, inode->i_ctime);
 
 
 
 
 
320	to->di_nlink = cpu_to_be32(inode->i_nlink);
321	to->di_gen = cpu_to_be32(inode->i_generation);
322	to->di_mode = cpu_to_be16(inode->i_mode);
323
324	to->di_size = cpu_to_be64(ip->i_disk_size);
325	to->di_nblocks = cpu_to_be64(ip->i_nblocks);
326	to->di_extsize = cpu_to_be32(ip->i_extsize);
327	to->di_forkoff = ip->i_forkoff;
328	to->di_aformat = xfs_ifork_format(&ip->i_af);
329	to->di_flags = cpu_to_be16(ip->i_diflags);
330
331	if (xfs_has_v3inodes(ip->i_mount)) {
332		to->di_version = 3;
333		to->di_changecount = cpu_to_be64(inode_peek_iversion(inode));
334		to->di_crtime = xfs_inode_to_disk_ts(ip, ip->i_crtime);
335		to->di_flags2 = cpu_to_be64(ip->i_diflags2);
336		to->di_cowextsize = cpu_to_be32(ip->i_cowextsize);
 
 
 
 
337		to->di_ino = cpu_to_be64(ip->i_ino);
338		to->di_lsn = cpu_to_be64(lsn);
339		memset(to->di_pad2, 0, sizeof(to->di_pad2));
340		uuid_copy(&to->di_uuid, &ip->i_mount->m_sb.sb_meta_uuid);
341		to->di_v3_pad = 0;
342	} else {
343		to->di_version = 2;
344		to->di_flushiter = cpu_to_be16(ip->i_flushiter);
345		memset(to->di_v2_pad, 0, sizeof(to->di_v2_pad));
346	}
347
348	xfs_inode_to_disk_iext_counters(ip, to);
349}
350
351static xfs_failaddr_t
352xfs_dinode_verify_fork(
353	struct xfs_dinode	*dip,
354	struct xfs_mount	*mp,
355	int			whichfork)
356{
357	xfs_extnum_t		di_nextents;
358	xfs_extnum_t		max_extents;
359	mode_t			mode = be16_to_cpu(dip->di_mode);
360	uint32_t		fork_size = XFS_DFORK_SIZE(dip, mp, whichfork);
361	uint32_t		fork_format = XFS_DFORK_FORMAT(dip, whichfork);
362
363	di_nextents = xfs_dfork_nextents(dip, whichfork);
364
365	/*
366	 * For fork types that can contain local data, check that the fork
367	 * format matches the size of local data contained within the fork.
368	 *
369	 * For all types, check that when the size says the should be in extent
370	 * or btree format, the inode isn't claiming it is in local format.
371	 */
372	if (whichfork == XFS_DATA_FORK) {
373		if (S_ISDIR(mode) || S_ISLNK(mode)) {
374			if (be64_to_cpu(dip->di_size) <= fork_size &&
375			    fork_format != XFS_DINODE_FMT_LOCAL)
376				return __this_address;
377		}
378
379		if (be64_to_cpu(dip->di_size) > fork_size &&
380		    fork_format == XFS_DINODE_FMT_LOCAL)
381			return __this_address;
382	}
383
384	switch (fork_format) {
385	case XFS_DINODE_FMT_LOCAL:
386		/*
387		 * No local regular files yet.
388		 */
389		if (S_ISREG(mode) && whichfork == XFS_DATA_FORK)
390			return __this_address;
391		if (di_nextents)
392			return __this_address;
393		break;
394	case XFS_DINODE_FMT_EXTENTS:
395		if (di_nextents > XFS_DFORK_MAXEXT(dip, mp, whichfork))
396			return __this_address;
397		break;
398	case XFS_DINODE_FMT_BTREE:
399		max_extents = xfs_iext_max_nextents(
400					xfs_dinode_has_large_extent_counts(dip),
401					whichfork);
402		if (di_nextents > max_extents)
403			return __this_address;
404		break;
405	default:
406		return __this_address;
407	}
408	return NULL;
409}
410
411static xfs_failaddr_t
412xfs_dinode_verify_forkoff(
413	struct xfs_dinode	*dip,
414	struct xfs_mount	*mp)
415{
416	if (!dip->di_forkoff)
417		return NULL;
418
419	switch (dip->di_format)  {
420	case XFS_DINODE_FMT_DEV:
421		if (dip->di_forkoff != (roundup(sizeof(xfs_dev_t), 8) >> 3))
422			return __this_address;
423		break;
424	case XFS_DINODE_FMT_LOCAL:	/* fall through ... */
425	case XFS_DINODE_FMT_EXTENTS:    /* fall through ... */
426	case XFS_DINODE_FMT_BTREE:
427		if (dip->di_forkoff >= (XFS_LITINO(mp) >> 3))
428			return __this_address;
429		break;
430	default:
431		return __this_address;
432	}
433	return NULL;
434}
435
436static xfs_failaddr_t
437xfs_dinode_verify_nrext64(
438	struct xfs_mount	*mp,
439	struct xfs_dinode	*dip)
440{
441	if (xfs_dinode_has_large_extent_counts(dip)) {
442		if (!xfs_has_large_extent_counts(mp))
443			return __this_address;
444		if (dip->di_nrext64_pad != 0)
445			return __this_address;
446	} else if (dip->di_version >= 3) {
447		if (dip->di_v3_pad != 0)
448			return __this_address;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
449	}
450
451	return NULL;
452}
453
454xfs_failaddr_t
455xfs_dinode_verify(
456	struct xfs_mount	*mp,
457	xfs_ino_t		ino,
458	struct xfs_dinode	*dip)
459{
460	xfs_failaddr_t		fa;
461	uint16_t		mode;
462	uint16_t		flags;
463	uint64_t		flags2;
464	uint64_t		di_size;
465	xfs_extnum_t		nextents;
466	xfs_extnum_t		naextents;
467	xfs_filblks_t		nblocks;
468
469	if (dip->di_magic != cpu_to_be16(XFS_DINODE_MAGIC))
470		return __this_address;
471
472	/* Verify v3 integrity information first */
473	if (dip->di_version >= 3) {
474		if (!xfs_has_v3inodes(mp))
475			return __this_address;
476		if (!xfs_verify_cksum((char *)dip, mp->m_sb.sb_inodesize,
477				      XFS_DINODE_CRC_OFF))
478			return __this_address;
479		if (be64_to_cpu(dip->di_ino) != ino)
480			return __this_address;
481		if (!uuid_equal(&dip->di_uuid, &mp->m_sb.sb_meta_uuid))
482			return __this_address;
483	}
484
485	/* don't allow invalid i_size */
486	di_size = be64_to_cpu(dip->di_size);
487	if (di_size & (1ULL << 63))
488		return __this_address;
489
490	mode = be16_to_cpu(dip->di_mode);
491	if (mode && xfs_mode_to_ftype(mode) == XFS_DIR3_FT_UNKNOWN)
492		return __this_address;
493
494	/* No zero-length symlinks/dirs. */
495	if ((S_ISLNK(mode) || S_ISDIR(mode)) && di_size == 0)
496		return __this_address;
497
498	fa = xfs_dinode_verify_nrext64(mp, dip);
499	if (fa)
500		return fa;
501
502	nextents = xfs_dfork_data_extents(dip);
503	naextents = xfs_dfork_attr_extents(dip);
504	nblocks = be64_to_cpu(dip->di_nblocks);
505
506	/* Fork checks carried over from xfs_iformat_fork */
507	if (mode && nextents + naextents > nblocks)
508		return __this_address;
509
510	if (S_ISDIR(mode) && nextents > mp->m_dir_geo->max_extents)
511		return __this_address;
512
513	if (mode && XFS_DFORK_BOFF(dip) > mp->m_sb.sb_inodesize)
514		return __this_address;
515
516	flags = be16_to_cpu(dip->di_flags);
517
518	if (mode && (flags & XFS_DIFLAG_REALTIME) && !mp->m_rtdev_targp)
519		return __this_address;
520
521	/* check for illegal values of forkoff */
522	fa = xfs_dinode_verify_forkoff(dip, mp);
523	if (fa)
524		return fa;
525
526	/* Do we have appropriate data fork formats for the mode? */
527	switch (mode & S_IFMT) {
528	case S_IFIFO:
529	case S_IFCHR:
530	case S_IFBLK:
531	case S_IFSOCK:
532		if (dip->di_format != XFS_DINODE_FMT_DEV)
533			return __this_address;
534		break;
535	case S_IFREG:
536	case S_IFLNK:
537	case S_IFDIR:
538		fa = xfs_dinode_verify_fork(dip, mp, XFS_DATA_FORK);
539		if (fa)
540			return fa;
541		break;
542	case 0:
543		/* Uninitialized inode ok. */
544		break;
545	default:
546		return __this_address;
547	}
548
549	if (dip->di_forkoff) {
550		fa = xfs_dinode_verify_fork(dip, mp, XFS_ATTR_FORK);
551		if (fa)
552			return fa;
553	} else {
554		/*
555		 * If there is no fork offset, this may be a freshly-made inode
556		 * in a new disk cluster, in which case di_aformat is zeroed.
557		 * Otherwise, such an inode must be in EXTENTS format; this goes
558		 * for freed inodes as well.
559		 */
560		switch (dip->di_aformat) {
561		case 0:
562		case XFS_DINODE_FMT_EXTENTS:
563			break;
564		default:
565			return __this_address;
566		}
567		if (naextents)
568			return __this_address;
569	}
570
571	/* extent size hint validation */
572	fa = xfs_inode_validate_extsize(mp, be32_to_cpu(dip->di_extsize),
573			mode, flags);
574	if (fa)
575		return fa;
576
577	/* only version 3 or greater inodes are extensively verified here */
578	if (dip->di_version < 3)
579		return NULL;
580
581	flags2 = be64_to_cpu(dip->di_flags2);
582
583	/* don't allow reflink/cowextsize if we don't have reflink */
584	if ((flags2 & (XFS_DIFLAG2_REFLINK | XFS_DIFLAG2_COWEXTSIZE)) &&
585	     !xfs_has_reflink(mp))
586		return __this_address;
587
588	/* only regular files get reflink */
589	if ((flags2 & XFS_DIFLAG2_REFLINK) && (mode & S_IFMT) != S_IFREG)
590		return __this_address;
591
592	/* don't let reflink and realtime mix */
593	if ((flags2 & XFS_DIFLAG2_REFLINK) && (flags & XFS_DIFLAG_REALTIME))
594		return __this_address;
595
596	/* COW extent size hint validation */
597	fa = xfs_inode_validate_cowextsize(mp, be32_to_cpu(dip->di_cowextsize),
598			mode, flags, flags2);
599	if (fa)
600		return fa;
601
602	/* bigtime iflag can only happen on bigtime filesystems */
603	if (xfs_dinode_has_bigtime(dip) &&
604	    !xfs_has_bigtime(mp))
605		return __this_address;
606
607	return NULL;
 
 
 
 
 
 
 
 
 
608}
609
610void
611xfs_dinode_calc_crc(
612	struct xfs_mount	*mp,
613	struct xfs_dinode	*dip)
614{
615	uint32_t		crc;
616
617	if (dip->di_version < 3)
618		return;
619
620	ASSERT(xfs_has_crc(mp));
621	crc = xfs_start_cksum_update((char *)dip, mp->m_sb.sb_inodesize,
622			      XFS_DINODE_CRC_OFF);
623	dip->di_crc = xfs_end_cksum(crc);
624}
625
626/*
627 * Validate di_extsize hint.
628 *
629 * 1. Extent size hint is only valid for directories and regular files.
630 * 2. FS_XFLAG_EXTSIZE is only valid for regular files.
631 * 3. FS_XFLAG_EXTSZINHERIT is only valid for directories.
632 * 4. Hint cannot be larger than MAXTEXTLEN.
633 * 5. Can be changed on directories at any time.
634 * 6. Hint value of 0 turns off hints, clears inode flags.
635 * 7. Extent size must be a multiple of the appropriate block size.
636 *    For realtime files, this is the rt extent size.
637 * 8. For non-realtime files, the extent size hint must be limited
638 *    to half the AG size to avoid alignment extending the extent beyond the
639 *    limits of the AG.
640 */
641xfs_failaddr_t
642xfs_inode_validate_extsize(
643	struct xfs_mount		*mp,
644	uint32_t			extsize,
645	uint16_t			mode,
646	uint16_t			flags)
647{
648	bool				rt_flag;
649	bool				hint_flag;
650	bool				inherit_flag;
651	uint32_t			extsize_bytes;
652	uint32_t			blocksize_bytes;
653
654	rt_flag = (flags & XFS_DIFLAG_REALTIME);
655	hint_flag = (flags & XFS_DIFLAG_EXTSIZE);
656	inherit_flag = (flags & XFS_DIFLAG_EXTSZINHERIT);
657	extsize_bytes = XFS_FSB_TO_B(mp, extsize);
658
659	/*
660	 * This comment describes a historic gap in this verifier function.
661	 *
662	 * For a directory with both RTINHERIT and EXTSZINHERIT flags set, this
663	 * function has never checked that the extent size hint is an integer
664	 * multiple of the realtime extent size.  Since we allow users to set
665	 * this combination  on non-rt filesystems /and/ to change the rt
666	 * extent size when adding a rt device to a filesystem, the net effect
667	 * is that users can configure a filesystem anticipating one rt
668	 * geometry and change their minds later.  Directories do not use the
669	 * extent size hint, so this is harmless for them.
670	 *
671	 * If a directory with a misaligned extent size hint is allowed to
672	 * propagate that hint into a new regular realtime file, the result
673	 * is that the inode cluster buffer verifier will trigger a corruption
674	 * shutdown the next time it is run, because the verifier has always
675	 * enforced the alignment rule for regular files.
676	 *
677	 * Because we allow administrators to set a new rt extent size when
678	 * adding a rt section, we cannot add a check to this verifier because
679	 * that will result a new source of directory corruption errors when
680	 * reading an existing filesystem.  Instead, we rely on callers to
681	 * decide when alignment checks are appropriate, and fix things up as
682	 * needed.
683	 */
 
 
 
684
685	if (rt_flag)
686		blocksize_bytes = XFS_FSB_TO_B(mp, mp->m_sb.sb_rextsize);
687	else
688		blocksize_bytes = mp->m_sb.sb_blocksize;
689
690	if ((hint_flag || inherit_flag) && !(S_ISDIR(mode) || S_ISREG(mode)))
691		return __this_address;
692
693	if (hint_flag && !S_ISREG(mode))
694		return __this_address;
695
696	if (inherit_flag && !S_ISDIR(mode))
697		return __this_address;
698
699	if ((hint_flag || inherit_flag) && extsize == 0)
700		return __this_address;
701
702	/* free inodes get flags set to zero but extsize remains */
703	if (mode && !(hint_flag || inherit_flag) && extsize != 0)
704		return __this_address;
705
706	if (extsize_bytes % blocksize_bytes)
707		return __this_address;
708
709	if (extsize > XFS_MAX_BMBT_EXTLEN)
710		return __this_address;
711
712	if (!rt_flag && extsize > mp->m_sb.sb_agblocks / 2)
713		return __this_address;
714
715	return NULL;
716}
717
718/*
719 * Validate di_cowextsize hint.
720 *
721 * 1. CoW extent size hint can only be set if reflink is enabled on the fs.
722 *    The inode does not have to have any shared blocks, but it must be a v3.
723 * 2. FS_XFLAG_COWEXTSIZE is only valid for directories and regular files;
724 *    for a directory, the hint is propagated to new files.
725 * 3. Can be changed on files & directories at any time.
726 * 4. Hint value of 0 turns off hints, clears inode flags.
727 * 5. Extent size must be a multiple of the appropriate block size.
728 * 6. The extent size hint must be limited to half the AG size to avoid
729 *    alignment extending the extent beyond the limits of the AG.
730 */
731xfs_failaddr_t
732xfs_inode_validate_cowextsize(
733	struct xfs_mount		*mp,
734	uint32_t			cowextsize,
735	uint16_t			mode,
736	uint16_t			flags,
737	uint64_t			flags2)
738{
739	bool				rt_flag;
740	bool				hint_flag;
741	uint32_t			cowextsize_bytes;
742
743	rt_flag = (flags & XFS_DIFLAG_REALTIME);
744	hint_flag = (flags2 & XFS_DIFLAG2_COWEXTSIZE);
745	cowextsize_bytes = XFS_FSB_TO_B(mp, cowextsize);
746
747	if (hint_flag && !xfs_has_reflink(mp))
748		return __this_address;
749
750	if (hint_flag && !(S_ISDIR(mode) || S_ISREG(mode)))
751		return __this_address;
752
753	if (hint_flag && cowextsize == 0)
754		return __this_address;
 
 
 
 
755
756	/* free inodes get flags set to zero but cowextsize remains */
757	if (mode && !hint_flag && cowextsize != 0)
758		return __this_address;
 
 
 
 
 
 
759
760	if (hint_flag && rt_flag)
761		return __this_address;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
762
763	if (cowextsize_bytes % mp->m_sb.sb_blocksize)
764		return __this_address;
 
 
 
 
 
 
 
765
766	if (cowextsize > XFS_MAX_BMBT_EXTLEN)
767		return __this_address;
768
769	if (cowextsize > mp->m_sb.sb_agblocks / 2)
770		return __this_address;
 
 
 
 
771
772	return NULL;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
773}
v4.6
 
  1/*
  2 * Copyright (c) 2000-2006 Silicon Graphics, Inc.
  3 * All Rights Reserved.
  4 *
  5 * This program is free software; you can redistribute it and/or
  6 * modify it under the terms of the GNU General Public License as
  7 * published by the Free Software Foundation.
  8 *
  9 * This program is distributed in the hope that it would be useful,
 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 12 * GNU General Public License for more details.
 13 *
 14 * You should have received a copy of the GNU General Public License
 15 * along with this program; if not, write the Free Software Foundation,
 16 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 17 */
 18#include "xfs.h"
 19#include "xfs_fs.h"
 20#include "xfs_shared.h"
 21#include "xfs_format.h"
 22#include "xfs_log_format.h"
 23#include "xfs_trans_resv.h"
 24#include "xfs_mount.h"
 
 25#include "xfs_inode.h"
 
 26#include "xfs_error.h"
 27#include "xfs_cksum.h"
 28#include "xfs_icache.h"
 29#include "xfs_trans.h"
 30#include "xfs_ialloc.h"
 
 31
 32/*
 33 * Check that none of the inode's in the buffer have a next
 34 * unlinked field of 0.
 35 */
 36#if defined(DEBUG)
 37void
 38xfs_inobp_check(
 39	xfs_mount_t	*mp,
 40	xfs_buf_t	*bp)
 41{
 42	int		i;
 43	int		j;
 44	xfs_dinode_t	*dip;
 45
 46	j = mp->m_inode_cluster_size >> mp->m_sb.sb_inodelog;
 47
 48	for (i = 0; i < j; i++) {
 49		dip = xfs_buf_offset(bp, i * mp->m_sb.sb_inodesize);
 50		if (!dip->di_next_unlinked)  {
 51			xfs_alert(mp,
 52	"Detected bogus zero next_unlinked field in inode %d buffer 0x%llx.",
 53				i, (long long)bp->b_bn);
 54		}
 55	}
 56}
 57#endif
 58
 59/*
 60 * If we are doing readahead on an inode buffer, we might be in log recovery
 61 * reading an inode allocation buffer that hasn't yet been replayed, and hence
 62 * has not had the inode cores stamped into it. Hence for readahead, the buffer
 63 * may be potentially invalid.
 64 *
 65 * If the readahead buffer is invalid, we need to mark it with an error and
 66 * clear the DONE status of the buffer so that a followup read will re-read it
 67 * from disk. We don't report the error otherwise to avoid warnings during log
 68 * recovery and we don't get unnecssary panics on debug kernels. We use EIO here
 69 * because all we want to do is say readahead failed; there is no-one to report
 70 * the error to, so this will distinguish it from a non-ra verifier failure.
 71 * Changes to this readahead error behavour also need to be reflected in
 72 * xfs_dquot_buf_readahead_verify().
 73 */
 74static void
 75xfs_inode_buf_verify(
 76	struct xfs_buf	*bp,
 77	bool		readahead)
 78{
 79	struct xfs_mount *mp = bp->b_target->bt_mount;
 80	int		i;
 81	int		ni;
 82
 83	/*
 84	 * Validate the magic number and version of every inode in the buffer
 85	 */
 86	ni = XFS_BB_TO_FSB(mp, bp->b_length) * mp->m_sb.sb_inopblock;
 87	for (i = 0; i < ni; i++) {
 88		int		di_ok;
 89		xfs_dinode_t	*dip;
 
 90
 91		dip = xfs_buf_offset(bp, (i << mp->m_sb.sb_inodelog));
 92		di_ok = dip->di_magic == cpu_to_be16(XFS_DINODE_MAGIC) &&
 93			    XFS_DINODE_GOOD_VERSION(dip->di_version);
 
 
 94		if (unlikely(XFS_TEST_ERROR(!di_ok, mp,
 95						XFS_ERRTAG_ITOBP_INOTOBP,
 96						XFS_RANDOM_ITOBP_INOTOBP))) {
 97			if (readahead) {
 98				bp->b_flags &= ~XBF_DONE;
 99				xfs_buf_ioerror(bp, -EIO);
100				return;
101			}
102
103			xfs_buf_ioerror(bp, -EFSCORRUPTED);
104			xfs_verifier_error(bp);
105#ifdef DEBUG
106			xfs_alert(mp,
107				"bad inode magic/vsn daddr %lld #%d (magic=%x)",
108				(unsigned long long)bp->b_bn, i,
109				be16_to_cpu(dip->di_magic));
110#endif
 
 
 
 
111		}
112	}
113	xfs_inobp_check(mp, bp);
114}
115
116
117static void
118xfs_inode_buf_read_verify(
119	struct xfs_buf	*bp)
120{
121	xfs_inode_buf_verify(bp, false);
122}
123
124static void
125xfs_inode_buf_readahead_verify(
126	struct xfs_buf	*bp)
127{
128	xfs_inode_buf_verify(bp, true);
129}
130
131static void
132xfs_inode_buf_write_verify(
133	struct xfs_buf	*bp)
134{
135	xfs_inode_buf_verify(bp, false);
136}
137
138const struct xfs_buf_ops xfs_inode_buf_ops = {
139	.name = "xfs_inode",
 
 
140	.verify_read = xfs_inode_buf_read_verify,
141	.verify_write = xfs_inode_buf_write_verify,
142};
143
144const struct xfs_buf_ops xfs_inode_buf_ra_ops = {
145	.name = "xxfs_inode_ra",
 
 
146	.verify_read = xfs_inode_buf_readahead_verify,
147	.verify_write = xfs_inode_buf_write_verify,
148};
149
150
151/*
152 * This routine is called to map an inode to the buffer containing the on-disk
153 * version of the inode.  It returns a pointer to the buffer containing the
154 * on-disk inode in the bpp parameter, and in the dipp parameter it returns a
155 * pointer to the on-disk inode within that buffer.
156 *
157 * If a non-zero error is returned, then the contents of bpp and dipp are
158 * undefined.
159 */
160int
161xfs_imap_to_bp(
162	struct xfs_mount	*mp,
163	struct xfs_trans	*tp,
164	struct xfs_imap		*imap,
165	struct xfs_dinode       **dipp,
166	struct xfs_buf		**bpp,
167	uint			buf_flags,
168	uint			iget_flags)
 
 
 
 
169{
170	struct xfs_buf		*bp;
171	int			error;
 
 
 
 
 
 
172
173	buf_flags |= XBF_UNMAPPED;
174	error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, imap->im_blkno,
175				   (int)imap->im_len, buf_flags, &bp,
176				   &xfs_inode_buf_ops);
177	if (error) {
178		if (error == -EAGAIN) {
179			ASSERT(buf_flags & XBF_TRYLOCK);
180			return error;
181		}
182
183		if (error == -EFSCORRUPTED &&
184		    (iget_flags & XFS_IGET_UNTRUSTED))
185			return -EINVAL;
186
187		xfs_warn(mp, "%s: xfs_trans_read_buf() returned error %d.",
188			__func__, error);
189		return error;
190	}
191
192	*bpp = bp;
193	*dipp = xfs_buf_offset(bp, imap->im_boffset);
194	return 0;
195}
196
197void
198xfs_inode_from_disk(
199	struct xfs_inode	*ip,
200	struct xfs_dinode	*from)
201{
202	struct xfs_icdinode	*to = &ip->i_d;
203	struct inode		*inode = VFS_I(ip);
 
 
 
 
204
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
205
206	/*
207	 * Convert v1 inodes immediately to v2 inode format as this is the
208	 * minimum inode version format we support in the rest of the code.
 
209	 */
210	to->di_version = from->di_version;
211	if (to->di_version == 1) {
212		set_nlink(inode, be16_to_cpu(from->di_onlink));
213		to->di_projid_lo = 0;
214		to->di_projid_hi = 0;
215		to->di_version = 2;
216	} else {
217		set_nlink(inode, be32_to_cpu(from->di_nlink));
218		to->di_projid_lo = be16_to_cpu(from->di_projid_lo);
219		to->di_projid_hi = be16_to_cpu(from->di_projid_hi);
220	}
221
222	to->di_format = from->di_format;
223	to->di_uid = be32_to_cpu(from->di_uid);
224	to->di_gid = be32_to_cpu(from->di_gid);
225	to->di_flushiter = be16_to_cpu(from->di_flushiter);
226
227	/*
228	 * Time is signed, so need to convert to signed 32 bit before
229	 * storing in inode timestamp which may be 64 bit. Otherwise
230	 * a time before epoch is converted to a time long after epoch
231	 * on 64 bit systems.
232	 */
233	inode->i_atime.tv_sec = (int)be32_to_cpu(from->di_atime.t_sec);
234	inode->i_atime.tv_nsec = (int)be32_to_cpu(from->di_atime.t_nsec);
235	inode->i_mtime.tv_sec = (int)be32_to_cpu(from->di_mtime.t_sec);
236	inode->i_mtime.tv_nsec = (int)be32_to_cpu(from->di_mtime.t_nsec);
237	inode->i_ctime.tv_sec = (int)be32_to_cpu(from->di_ctime.t_sec);
238	inode->i_ctime.tv_nsec = (int)be32_to_cpu(from->di_ctime.t_nsec);
239	inode->i_generation = be32_to_cpu(from->di_gen);
240	inode->i_mode = be16_to_cpu(from->di_mode);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
241
242	to->di_size = be64_to_cpu(from->di_size);
243	to->di_nblocks = be64_to_cpu(from->di_nblocks);
244	to->di_extsize = be32_to_cpu(from->di_extsize);
245	to->di_nextents = be32_to_cpu(from->di_nextents);
246	to->di_anextents = be16_to_cpu(from->di_anextents);
247	to->di_forkoff = from->di_forkoff;
248	to->di_aformat	= from->di_aformat;
249	to->di_dmevmask	= be32_to_cpu(from->di_dmevmask);
250	to->di_dmstate	= be16_to_cpu(from->di_dmstate);
251	to->di_flags	= be16_to_cpu(from->di_flags);
252
253	if (to->di_version == 3) {
254		inode->i_version = be64_to_cpu(from->di_changecount);
255		to->di_crtime.t_sec = be32_to_cpu(from->di_crtime.t_sec);
256		to->di_crtime.t_nsec = be32_to_cpu(from->di_crtime.t_nsec);
257		to->di_flags2 = be64_to_cpu(from->di_flags2);
258	}
259}
260
261void
262xfs_inode_to_disk(
263	struct xfs_inode	*ip,
264	struct xfs_dinode	*to,
265	xfs_lsn_t		lsn)
266{
267	struct xfs_icdinode	*from = &ip->i_d;
268	struct inode		*inode = VFS_I(ip);
269
270	to->di_magic = cpu_to_be16(XFS_DINODE_MAGIC);
271	to->di_onlink = 0;
272
273	to->di_version = from->di_version;
274	to->di_format = from->di_format;
275	to->di_uid = cpu_to_be32(from->di_uid);
276	to->di_gid = cpu_to_be32(from->di_gid);
277	to->di_projid_lo = cpu_to_be16(from->di_projid_lo);
278	to->di_projid_hi = cpu_to_be16(from->di_projid_hi);
279
280	memset(to->di_pad, 0, sizeof(to->di_pad));
281	to->di_atime.t_sec = cpu_to_be32(inode->i_atime.tv_sec);
282	to->di_atime.t_nsec = cpu_to_be32(inode->i_atime.tv_nsec);
283	to->di_mtime.t_sec = cpu_to_be32(inode->i_mtime.tv_sec);
284	to->di_mtime.t_nsec = cpu_to_be32(inode->i_mtime.tv_nsec);
285	to->di_ctime.t_sec = cpu_to_be32(inode->i_ctime.tv_sec);
286	to->di_ctime.t_nsec = cpu_to_be32(inode->i_ctime.tv_nsec);
287	to->di_nlink = cpu_to_be32(inode->i_nlink);
288	to->di_gen = cpu_to_be32(inode->i_generation);
289	to->di_mode = cpu_to_be16(inode->i_mode);
290
291	to->di_size = cpu_to_be64(from->di_size);
292	to->di_nblocks = cpu_to_be64(from->di_nblocks);
293	to->di_extsize = cpu_to_be32(from->di_extsize);
294	to->di_nextents = cpu_to_be32(from->di_nextents);
295	to->di_anextents = cpu_to_be16(from->di_anextents);
296	to->di_forkoff = from->di_forkoff;
297	to->di_aformat = from->di_aformat;
298	to->di_dmevmask = cpu_to_be32(from->di_dmevmask);
299	to->di_dmstate = cpu_to_be16(from->di_dmstate);
300	to->di_flags = cpu_to_be16(from->di_flags);
301
302	if (from->di_version == 3) {
303		to->di_changecount = cpu_to_be64(inode->i_version);
304		to->di_crtime.t_sec = cpu_to_be32(from->di_crtime.t_sec);
305		to->di_crtime.t_nsec = cpu_to_be32(from->di_crtime.t_nsec);
306		to->di_flags2 = cpu_to_be64(from->di_flags2);
307
308		to->di_ino = cpu_to_be64(ip->i_ino);
309		to->di_lsn = cpu_to_be64(lsn);
310		memset(to->di_pad2, 0, sizeof(to->di_pad2));
311		uuid_copy(&to->di_uuid, &ip->i_mount->m_sb.sb_meta_uuid);
312		to->di_flushiter = 0;
313	} else {
314		to->di_flushiter = cpu_to_be16(from->di_flushiter);
 
 
315	}
 
 
316}
317
318void
319xfs_log_dinode_to_disk(
320	struct xfs_log_dinode	*from,
321	struct xfs_dinode	*to)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
322{
323	to->di_magic = cpu_to_be16(from->di_magic);
324	to->di_mode = cpu_to_be16(from->di_mode);
325	to->di_version = from->di_version;
326	to->di_format = from->di_format;
327	to->di_onlink = 0;
328	to->di_uid = cpu_to_be32(from->di_uid);
329	to->di_gid = cpu_to_be32(from->di_gid);
330	to->di_nlink = cpu_to_be32(from->di_nlink);
331	to->di_projid_lo = cpu_to_be16(from->di_projid_lo);
332	to->di_projid_hi = cpu_to_be16(from->di_projid_hi);
333	memcpy(to->di_pad, from->di_pad, sizeof(to->di_pad));
334
335	to->di_atime.t_sec = cpu_to_be32(from->di_atime.t_sec);
336	to->di_atime.t_nsec = cpu_to_be32(from->di_atime.t_nsec);
337	to->di_mtime.t_sec = cpu_to_be32(from->di_mtime.t_sec);
338	to->di_mtime.t_nsec = cpu_to_be32(from->di_mtime.t_nsec);
339	to->di_ctime.t_sec = cpu_to_be32(from->di_ctime.t_sec);
340	to->di_ctime.t_nsec = cpu_to_be32(from->di_ctime.t_nsec);
341
342	to->di_size = cpu_to_be64(from->di_size);
343	to->di_nblocks = cpu_to_be64(from->di_nblocks);
344	to->di_extsize = cpu_to_be32(from->di_extsize);
345	to->di_nextents = cpu_to_be32(from->di_nextents);
346	to->di_anextents = cpu_to_be16(from->di_anextents);
347	to->di_forkoff = from->di_forkoff;
348	to->di_aformat = from->di_aformat;
349	to->di_dmevmask = cpu_to_be32(from->di_dmevmask);
350	to->di_dmstate = cpu_to_be16(from->di_dmstate);
351	to->di_flags = cpu_to_be16(from->di_flags);
352	to->di_gen = cpu_to_be32(from->di_gen);
353
354	if (from->di_version == 3) {
355		to->di_changecount = cpu_to_be64(from->di_changecount);
356		to->di_crtime.t_sec = cpu_to_be32(from->di_crtime.t_sec);
357		to->di_crtime.t_nsec = cpu_to_be32(from->di_crtime.t_nsec);
358		to->di_flags2 = cpu_to_be64(from->di_flags2);
359		to->di_ino = cpu_to_be64(from->di_ino);
360		to->di_lsn = cpu_to_be64(from->di_lsn);
361		memcpy(to->di_pad2, from->di_pad2, sizeof(to->di_pad2));
362		uuid_copy(&to->di_uuid, &from->di_uuid);
363		to->di_flushiter = 0;
364	} else {
365		to->di_flushiter = cpu_to_be16(from->di_flushiter);
366	}
 
 
367}
368
369static bool
370xfs_dinode_verify(
371	struct xfs_mount	*mp,
372	struct xfs_inode	*ip,
373	struct xfs_dinode	*dip)
374{
 
 
 
 
 
 
 
 
 
375	if (dip->di_magic != cpu_to_be16(XFS_DINODE_MAGIC))
376		return false;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
377
378	/* only version 3 or greater inodes are extensively verified here */
379	if (dip->di_version < 3)
380		return true;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
381
382	if (!xfs_sb_version_hascrc(&mp->m_sb))
383		return false;
384	if (!xfs_verify_cksum((char *)dip, mp->m_sb.sb_inodesize,
385			      XFS_DINODE_CRC_OFF))
386		return false;
387	if (be64_to_cpu(dip->di_ino) != ip->i_ino)
388		return false;
389	if (!uuid_equal(&dip->di_uuid, &mp->m_sb.sb_meta_uuid))
390		return false;
391	return true;
392}
393
394void
395xfs_dinode_calc_crc(
396	struct xfs_mount	*mp,
397	struct xfs_dinode	*dip)
398{
399	__uint32_t		crc;
400
401	if (dip->di_version < 3)
402		return;
403
404	ASSERT(xfs_sb_version_hascrc(&mp->m_sb));
405	crc = xfs_start_cksum((char *)dip, mp->m_sb.sb_inodesize,
406			      XFS_DINODE_CRC_OFF);
407	dip->di_crc = xfs_end_cksum(crc);
408}
409
410/*
411 * Read the disk inode attributes into the in-core inode structure.
412 *
413 * For version 5 superblocks, if we are initialising a new inode and we are not
414 * utilising the XFS_MOUNT_IKEEP inode cluster mode, we can simple build the new
415 * inode core with a random generation number. If we are keeping inodes around,
416 * we need to read the inode cluster to get the existing generation number off
417 * disk. Further, if we are using version 4 superblocks (i.e. v1/v2 inode
418 * format) then log recovery is dependent on the di_flushiter field being
419 * initialised from the current on-disk value and hence we must also read the
420 * inode off disk.
 
 
 
421 */
422int
423xfs_iread(
424	xfs_mount_t	*mp,
425	xfs_trans_t	*tp,
426	xfs_inode_t	*ip,
427	uint		iget_flags)
428{
429	xfs_buf_t	*bp;
430	xfs_dinode_t	*dip;
431	int		error;
 
 
 
 
 
 
 
432
433	/*
434	 * Fill in the location information in the in-core inode.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
435	 */
436	error = xfs_imap(mp, tp, ip->i_ino, &ip->i_imap, iget_flags);
437	if (error)
438		return error;
439
440	/* shortcut IO on inode allocation if possible */
441	if ((iget_flags & XFS_IGET_CREATE) &&
442	    xfs_sb_version_hascrc(&mp->m_sb) &&
443	    !(mp->m_flags & XFS_MOUNT_IKEEP)) {
444		/* initialise the on-disk inode core */
445		memset(&ip->i_d, 0, sizeof(ip->i_d));
446		VFS_I(ip)->i_generation = prandom_u32();
447		if (xfs_sb_version_hascrc(&mp->m_sb))
448			ip->i_d.di_version = 3;
449		else
450			ip->i_d.di_version = 2;
451		return 0;
452	}
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
453
454	/*
455	 * Get pointers to the on-disk inode and the buffer containing it.
456	 */
457	error = xfs_imap_to_bp(mp, tp, &ip->i_imap, &dip, &bp, 0, iget_flags);
458	if (error)
459		return error;
460
461	/* even unallocated inodes are verified */
462	if (!xfs_dinode_verify(mp, ip, dip)) {
463		xfs_alert(mp, "%s: validation failed for inode %lld failed",
464				__func__, ip->i_ino);
465
466		XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, dip);
467		error = -EFSCORRUPTED;
468		goto out_brelse;
469	}
470
471	/*
472	 * If the on-disk inode is already linked to a directory
473	 * entry, copy all of the inode into the in-core inode.
474	 * xfs_iformat_fork() handles copying in the inode format
475	 * specific information.
476	 * Otherwise, just get the truly permanent information.
477	 */
478	if (dip->di_mode) {
479		xfs_inode_from_disk(ip, dip);
480		error = xfs_iformat_fork(ip, dip);
481		if (error)  {
482#ifdef DEBUG
483			xfs_alert(mp, "%s: xfs_iformat() returned error %d",
484				__func__, error);
485#endif /* DEBUG */
486			goto out_brelse;
487		}
488	} else {
489		/*
490		 * Partial initialisation of the in-core inode. Just the bits
491		 * that xfs_ialloc won't overwrite or relies on being correct.
492		 */
493		ip->i_d.di_version = dip->di_version;
494		VFS_I(ip)->i_generation = be32_to_cpu(dip->di_gen);
495		ip->i_d.di_flushiter = be16_to_cpu(dip->di_flushiter);
496
497		/*
498		 * Make sure to pull in the mode here as well in
499		 * case the inode is released without being used.
500		 * This ensures that xfs_inactive() will see that
501		 * the inode is already free and not try to mess
502		 * with the uninitialized part of it.
503		 */
504		VFS_I(ip)->i_mode = 0;
505	}
506
507	ASSERT(ip->i_d.di_version >= 2);
508	ip->i_delayed_blks = 0;
509
510	/*
511	 * Mark the buffer containing the inode as something to keep
512	 * around for a while.  This helps to keep recently accessed
513	 * meta-data in-core longer.
514	 */
515	xfs_buf_set_ref(bp, XFS_INO_REF);
516
517	/*
518	 * Use xfs_trans_brelse() to release the buffer containing the on-disk
519	 * inode, because it was acquired with xfs_trans_read_buf() in
520	 * xfs_imap_to_bp() above.  If tp is NULL, this is just a normal
521	 * brelse().  If we're within a transaction, then xfs_trans_brelse()
522	 * will only release the buffer if it is not dirty within the
523	 * transaction.  It will be OK to release the buffer in this case,
524	 * because inodes on disk are never destroyed and we will be locking the
525	 * new in-core inode before putting it in the cache where other
526	 * processes can find it.  Thus we don't have to worry about the inode
527	 * being changed just because we released the buffer.
528	 */
529 out_brelse:
530	xfs_trans_brelse(tp, bp);
531	return error;
532}