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18#include "xfs.h"
19#include "xfs_fs.h"
20#include "xfs_format.h"
21#include "xfs_log.h"
22#include "xfs_trans.h"
23#include "xfs_sb.h"
24#include "xfs_ag.h"
25#include "xfs_mount.h"
26#include "xfs_bmap_btree.h"
27#include "xfs_ialloc_btree.h"
28#include "xfs_dinode.h"
29#include "xfs_inode.h"
30#include "xfs_error.h"
31#include "xfs_cksum.h"
32#include "xfs_icache.h"
33#include "xfs_ialloc.h"
34
35
36
37
38
39#if defined(DEBUG)
40void
41xfs_inobp_check(
42 xfs_mount_t *mp,
43 xfs_buf_t *bp)
44{
45 int i;
46 int j;
47 xfs_dinode_t *dip;
48
49 j = mp->m_inode_cluster_size >> mp->m_sb.sb_inodelog;
50
51 for (i = 0; i < j; i++) {
52 dip = (xfs_dinode_t *)xfs_buf_offset(bp,
53 i * mp->m_sb.sb_inodesize);
54 if (!dip->di_next_unlinked) {
55 xfs_alert(mp,
56 "Detected bogus zero next_unlinked field in inode %d buffer 0x%llx.",
57 i, (long long)bp->b_bn);
58 }
59 }
60}
61#endif
62
63
64
65
66
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71
72
73
74
75static void
76xfs_inode_buf_verify(
77 struct xfs_buf *bp,
78 bool readahead)
79{
80 struct xfs_mount *mp = bp->b_target->bt_mount;
81 int i;
82 int ni;
83
84
85
86
87 ni = XFS_BB_TO_FSB(mp, bp->b_length) * mp->m_sb.sb_inopblock;
88 for (i = 0; i < ni; i++) {
89 int di_ok;
90 xfs_dinode_t *dip;
91
92 dip = (struct xfs_dinode *)xfs_buf_offset(bp,
93 (i << mp->m_sb.sb_inodelog));
94 di_ok = dip->di_magic == cpu_to_be16(XFS_DINODE_MAGIC) &&
95 XFS_DINODE_GOOD_VERSION(dip->di_version);
96 if (unlikely(XFS_TEST_ERROR(!di_ok, mp,
97 XFS_ERRTAG_ITOBP_INOTOBP,
98 XFS_RANDOM_ITOBP_INOTOBP))) {
99 if (readahead) {
100 bp->b_flags &= ~XBF_DONE;
101 return;
102 }
103
104 xfs_buf_ioerror(bp, EFSCORRUPTED);
105 XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_HIGH,
106 mp, dip);
107#ifdef DEBUG
108 xfs_alert(mp,
109 "bad inode magic/vsn daddr %lld #%d (magic=%x)",
110 (unsigned long long)bp->b_bn, i,
111 be16_to_cpu(dip->di_magic));
112#endif
113 }
114 }
115 xfs_inobp_check(mp, bp);
116}
117
118
119static void
120xfs_inode_buf_read_verify(
121 struct xfs_buf *bp)
122{
123 xfs_inode_buf_verify(bp, false);
124}
125
126static void
127xfs_inode_buf_readahead_verify(
128 struct xfs_buf *bp)
129{
130 xfs_inode_buf_verify(bp, true);
131}
132
133static void
134xfs_inode_buf_write_verify(
135 struct xfs_buf *bp)
136{
137 xfs_inode_buf_verify(bp, false);
138}
139
140const struct xfs_buf_ops xfs_inode_buf_ops = {
141 .verify_read = xfs_inode_buf_read_verify,
142 .verify_write = xfs_inode_buf_write_verify,
143};
144
145const struct xfs_buf_ops xfs_inode_buf_ra_ops = {
146 .verify_read = xfs_inode_buf_readahead_verify,
147 .verify_write = xfs_inode_buf_write_verify,
148};
149
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158
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 XFS_ERROR(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 = (struct xfs_dinode *)xfs_buf_offset(bp, imap->im_boffset);
194 return 0;
195}
196
197void
198xfs_dinode_from_disk(
199 xfs_icdinode_t *to,
200 xfs_dinode_t *from)
201{
202 to->di_magic = be16_to_cpu(from->di_magic);
203 to->di_mode = be16_to_cpu(from->di_mode);
204 to->di_version = from ->di_version;
205 to->di_format = from->di_format;
206 to->di_onlink = be16_to_cpu(from->di_onlink);
207 to->di_uid = be32_to_cpu(from->di_uid);
208 to->di_gid = be32_to_cpu(from->di_gid);
209 to->di_nlink = be32_to_cpu(from->di_nlink);
210 to->di_projid_lo = be16_to_cpu(from->di_projid_lo);
211 to->di_projid_hi = be16_to_cpu(from->di_projid_hi);
212 memcpy(to->di_pad, from->di_pad, sizeof(to->di_pad));
213 to->di_flushiter = be16_to_cpu(from->di_flushiter);
214 to->di_atime.t_sec = be32_to_cpu(from->di_atime.t_sec);
215 to->di_atime.t_nsec = be32_to_cpu(from->di_atime.t_nsec);
216 to->di_mtime.t_sec = be32_to_cpu(from->di_mtime.t_sec);
217 to->di_mtime.t_nsec = be32_to_cpu(from->di_mtime.t_nsec);
218 to->di_ctime.t_sec = be32_to_cpu(from->di_ctime.t_sec);
219 to->di_ctime.t_nsec = be32_to_cpu(from->di_ctime.t_nsec);
220 to->di_size = be64_to_cpu(from->di_size);
221 to->di_nblocks = be64_to_cpu(from->di_nblocks);
222 to->di_extsize = be32_to_cpu(from->di_extsize);
223 to->di_nextents = be32_to_cpu(from->di_nextents);
224 to->di_anextents = be16_to_cpu(from->di_anextents);
225 to->di_forkoff = from->di_forkoff;
226 to->di_aformat = from->di_aformat;
227 to->di_dmevmask = be32_to_cpu(from->di_dmevmask);
228 to->di_dmstate = be16_to_cpu(from->di_dmstate);
229 to->di_flags = be16_to_cpu(from->di_flags);
230 to->di_gen = be32_to_cpu(from->di_gen);
231
232 if (to->di_version == 3) {
233 to->di_changecount = be64_to_cpu(from->di_changecount);
234 to->di_crtime.t_sec = be32_to_cpu(from->di_crtime.t_sec);
235 to->di_crtime.t_nsec = be32_to_cpu(from->di_crtime.t_nsec);
236 to->di_flags2 = be64_to_cpu(from->di_flags2);
237 to->di_ino = be64_to_cpu(from->di_ino);
238 to->di_lsn = be64_to_cpu(from->di_lsn);
239 memcpy(to->di_pad2, from->di_pad2, sizeof(to->di_pad2));
240 uuid_copy(&to->di_uuid, &from->di_uuid);
241 }
242}
243
244void
245xfs_dinode_to_disk(
246 xfs_dinode_t *to,
247 xfs_icdinode_t *from)
248{
249 to->di_magic = cpu_to_be16(from->di_magic);
250 to->di_mode = cpu_to_be16(from->di_mode);
251 to->di_version = from ->di_version;
252 to->di_format = from->di_format;
253 to->di_onlink = cpu_to_be16(from->di_onlink);
254 to->di_uid = cpu_to_be32(from->di_uid);
255 to->di_gid = cpu_to_be32(from->di_gid);
256 to->di_nlink = cpu_to_be32(from->di_nlink);
257 to->di_projid_lo = cpu_to_be16(from->di_projid_lo);
258 to->di_projid_hi = cpu_to_be16(from->di_projid_hi);
259 memcpy(to->di_pad, from->di_pad, sizeof(to->di_pad));
260 to->di_atime.t_sec = cpu_to_be32(from->di_atime.t_sec);
261 to->di_atime.t_nsec = cpu_to_be32(from->di_atime.t_nsec);
262 to->di_mtime.t_sec = cpu_to_be32(from->di_mtime.t_sec);
263 to->di_mtime.t_nsec = cpu_to_be32(from->di_mtime.t_nsec);
264 to->di_ctime.t_sec = cpu_to_be32(from->di_ctime.t_sec);
265 to->di_ctime.t_nsec = cpu_to_be32(from->di_ctime.t_nsec);
266 to->di_size = cpu_to_be64(from->di_size);
267 to->di_nblocks = cpu_to_be64(from->di_nblocks);
268 to->di_extsize = cpu_to_be32(from->di_extsize);
269 to->di_nextents = cpu_to_be32(from->di_nextents);
270 to->di_anextents = cpu_to_be16(from->di_anextents);
271 to->di_forkoff = from->di_forkoff;
272 to->di_aformat = from->di_aformat;
273 to->di_dmevmask = cpu_to_be32(from->di_dmevmask);
274 to->di_dmstate = cpu_to_be16(from->di_dmstate);
275 to->di_flags = cpu_to_be16(from->di_flags);
276 to->di_gen = cpu_to_be32(from->di_gen);
277
278 if (from->di_version == 3) {
279 to->di_changecount = cpu_to_be64(from->di_changecount);
280 to->di_crtime.t_sec = cpu_to_be32(from->di_crtime.t_sec);
281 to->di_crtime.t_nsec = cpu_to_be32(from->di_crtime.t_nsec);
282 to->di_flags2 = cpu_to_be64(from->di_flags2);
283 to->di_ino = cpu_to_be64(from->di_ino);
284 to->di_lsn = cpu_to_be64(from->di_lsn);
285 memcpy(to->di_pad2, from->di_pad2, sizeof(to->di_pad2));
286 uuid_copy(&to->di_uuid, &from->di_uuid);
287 to->di_flushiter = 0;
288 } else {
289 to->di_flushiter = cpu_to_be16(from->di_flushiter);
290 }
291}
292
293static bool
294xfs_dinode_verify(
295 struct xfs_mount *mp,
296 struct xfs_inode *ip,
297 struct xfs_dinode *dip)
298{
299 if (dip->di_magic != cpu_to_be16(XFS_DINODE_MAGIC))
300 return false;
301
302
303 if (dip->di_version < 3)
304 return true;
305
306 if (!xfs_sb_version_hascrc(&mp->m_sb))
307 return false;
308 if (!xfs_verify_cksum((char *)dip, mp->m_sb.sb_inodesize,
309 offsetof(struct xfs_dinode, di_crc)))
310 return false;
311 if (be64_to_cpu(dip->di_ino) != ip->i_ino)
312 return false;
313 if (!uuid_equal(&dip->di_uuid, &mp->m_sb.sb_uuid))
314 return false;
315 return true;
316}
317
318void
319xfs_dinode_calc_crc(
320 struct xfs_mount *mp,
321 struct xfs_dinode *dip)
322{
323 __uint32_t crc;
324
325 if (dip->di_version < 3)
326 return;
327
328 ASSERT(xfs_sb_version_hascrc(&mp->m_sb));
329 crc = xfs_start_cksum((char *)dip, mp->m_sb.sb_inodesize,
330 offsetof(struct xfs_dinode, di_crc));
331 dip->di_crc = xfs_end_cksum(crc);
332}
333
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343
344
345
346int
347xfs_iread(
348 xfs_mount_t *mp,
349 xfs_trans_t *tp,
350 xfs_inode_t *ip,
351 uint iget_flags)
352{
353 xfs_buf_t *bp;
354 xfs_dinode_t *dip;
355 int error;
356
357
358
359
360 error = xfs_imap(mp, tp, ip->i_ino, &ip->i_imap, iget_flags);
361 if (error)
362 return error;
363
364
365 if ((iget_flags & XFS_IGET_CREATE) &&
366 xfs_sb_version_hascrc(&mp->m_sb) &&
367 !(mp->m_flags & XFS_MOUNT_IKEEP)) {
368
369 memset(&ip->i_d, 0, sizeof(ip->i_d));
370 ip->i_d.di_magic = XFS_DINODE_MAGIC;
371 ip->i_d.di_gen = prandom_u32();
372 if (xfs_sb_version_hascrc(&mp->m_sb)) {
373 ip->i_d.di_version = 3;
374 ip->i_d.di_ino = ip->i_ino;
375 uuid_copy(&ip->i_d.di_uuid, &mp->m_sb.sb_uuid);
376 } else
377 ip->i_d.di_version = 2;
378 return 0;
379 }
380
381
382
383
384 error = xfs_imap_to_bp(mp, tp, &ip->i_imap, &dip, &bp, 0, iget_flags);
385 if (error)
386 return error;
387
388
389 if (!xfs_dinode_verify(mp, ip, dip)) {
390 xfs_alert(mp, "%s: validation failed for inode %lld failed",
391 __func__, ip->i_ino);
392
393 XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, dip);
394 error = XFS_ERROR(EFSCORRUPTED);
395 goto out_brelse;
396 }
397
398
399
400
401
402
403
404
405 if (dip->di_mode) {
406 xfs_dinode_from_disk(&ip->i_d, dip);
407 error = xfs_iformat_fork(ip, dip);
408 if (error) {
409#ifdef DEBUG
410 xfs_alert(mp, "%s: xfs_iformat() returned error %d",
411 __func__, error);
412#endif
413 goto out_brelse;
414 }
415 } else {
416
417
418
419
420 ip->i_d.di_magic = be16_to_cpu(dip->di_magic);
421 ip->i_d.di_version = dip->di_version;
422 ip->i_d.di_gen = be32_to_cpu(dip->di_gen);
423 ip->i_d.di_flushiter = be16_to_cpu(dip->di_flushiter);
424
425 if (dip->di_version == 3) {
426 ip->i_d.di_ino = be64_to_cpu(dip->di_ino);
427 uuid_copy(&ip->i_d.di_uuid, &dip->di_uuid);
428 }
429
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435
436
437 ip->i_d.di_mode = 0;
438 }
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450
451 if (ip->i_d.di_version == 1) {
452 ip->i_d.di_nlink = ip->i_d.di_onlink;
453 ip->i_d.di_onlink = 0;
454 xfs_set_projid(ip, 0);
455 }
456
457 ip->i_delayed_blks = 0;
458
459
460
461
462
463
464 xfs_buf_set_ref(bp, XFS_INO_REF);
465
466
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468
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475
476
477
478 out_brelse:
479 xfs_trans_brelse(tp, bp);
480 return error;
481}
482