Commit | Line | Data |
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1fd7115e DC |
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" | |
70a9883c | 20 | #include "xfs_shared.h" |
239880ef DC |
21 | #include "xfs_format.h" |
22 | #include "xfs_log_format.h" | |
23 | #include "xfs_trans_resv.h" | |
1fd7115e | 24 | #include "xfs_mount.h" |
3ab78df2 | 25 | #include "xfs_defer.h" |
1fd7115e DC |
26 | #include "xfs_inode.h" |
27 | #include "xfs_error.h" | |
28 | #include "xfs_cksum.h" | |
29 | #include "xfs_icache.h" | |
239880ef | 30 | #include "xfs_trans.h" |
a4fbe6ab | 31 | #include "xfs_ialloc.h" |
a324cbf1 | 32 | #include "xfs_dir2.h" |
1fd7115e DC |
33 | |
34 | /* | |
35 | * Check that none of the inode's in the buffer have a next | |
36 | * unlinked field of 0. | |
37 | */ | |
38 | #if defined(DEBUG) | |
39 | void | |
40 | xfs_inobp_check( | |
41 | xfs_mount_t *mp, | |
42 | xfs_buf_t *bp) | |
43 | { | |
44 | int i; | |
45 | int j; | |
46 | xfs_dinode_t *dip; | |
47 | ||
48 | j = mp->m_inode_cluster_size >> mp->m_sb.sb_inodelog; | |
49 | ||
50 | for (i = 0; i < j; i++) { | |
88ee2df7 | 51 | dip = xfs_buf_offset(bp, i * mp->m_sb.sb_inodesize); |
1fd7115e DC |
52 | if (!dip->di_next_unlinked) { |
53 | xfs_alert(mp, | |
74ffa796 DC |
54 | "Detected bogus zero next_unlinked field in inode %d buffer 0x%llx.", |
55 | i, (long long)bp->b_bn); | |
1fd7115e DC |
56 | } |
57 | } | |
58 | } | |
59 | #endif | |
60 | ||
8cdcc810 RW |
61 | bool |
62 | xfs_dinode_good_version( | |
63 | struct xfs_mount *mp, | |
64 | __u8 version) | |
65 | { | |
66 | if (xfs_sb_version_hascrc(&mp->m_sb)) | |
67 | return version == 3; | |
68 | ||
69 | return version == 1 || version == 2; | |
70 | } | |
71 | ||
d8914002 DC |
72 | /* |
73 | * If we are doing readahead on an inode buffer, we might be in log recovery | |
74 | * reading an inode allocation buffer that hasn't yet been replayed, and hence | |
75 | * has not had the inode cores stamped into it. Hence for readahead, the buffer | |
76 | * may be potentially invalid. | |
77 | * | |
b79f4a1c DC |
78 | * If the readahead buffer is invalid, we need to mark it with an error and |
79 | * clear the DONE status of the buffer so that a followup read will re-read it | |
80 | * from disk. We don't report the error otherwise to avoid warnings during log | |
81 | * recovery and we don't get unnecssary panics on debug kernels. We use EIO here | |
82 | * because all we want to do is say readahead failed; there is no-one to report | |
83 | * the error to, so this will distinguish it from a non-ra verifier failure. | |
7d6a13f0 DC |
84 | * Changes to this readahead error behavour also need to be reflected in |
85 | * xfs_dquot_buf_readahead_verify(). | |
d8914002 | 86 | */ |
1fd7115e DC |
87 | static void |
88 | xfs_inode_buf_verify( | |
d8914002 DC |
89 | struct xfs_buf *bp, |
90 | bool readahead) | |
1fd7115e DC |
91 | { |
92 | struct xfs_mount *mp = bp->b_target->bt_mount; | |
93 | int i; | |
94 | int ni; | |
95 | ||
96 | /* | |
97 | * Validate the magic number and version of every inode in the buffer | |
98 | */ | |
99 | ni = XFS_BB_TO_FSB(mp, bp->b_length) * mp->m_sb.sb_inopblock; | |
100 | for (i = 0; i < ni; i++) { | |
101 | int di_ok; | |
102 | xfs_dinode_t *dip; | |
103 | ||
88ee2df7 | 104 | dip = xfs_buf_offset(bp, (i << mp->m_sb.sb_inodelog)); |
1fd7115e | 105 | di_ok = dip->di_magic == cpu_to_be16(XFS_DINODE_MAGIC) && |
8cdcc810 | 106 | xfs_dinode_good_version(mp, dip->di_version); |
1fd7115e DC |
107 | if (unlikely(XFS_TEST_ERROR(!di_ok, mp, |
108 | XFS_ERRTAG_ITOBP_INOTOBP, | |
109 | XFS_RANDOM_ITOBP_INOTOBP))) { | |
d8914002 DC |
110 | if (readahead) { |
111 | bp->b_flags &= ~XBF_DONE; | |
b79f4a1c | 112 | xfs_buf_ioerror(bp, -EIO); |
d8914002 DC |
113 | return; |
114 | } | |
115 | ||
2451337d | 116 | xfs_buf_ioerror(bp, -EFSCORRUPTED); |
ce5028cf | 117 | xfs_verifier_error(bp); |
1fd7115e | 118 | #ifdef DEBUG |
74ffa796 | 119 | xfs_alert(mp, |
1fd7115e DC |
120 | "bad inode magic/vsn daddr %lld #%d (magic=%x)", |
121 | (unsigned long long)bp->b_bn, i, | |
122 | be16_to_cpu(dip->di_magic)); | |
1fd7115e DC |
123 | #endif |
124 | } | |
125 | } | |
126 | xfs_inobp_check(mp, bp); | |
127 | } | |
128 | ||
129 | ||
130 | static void | |
131 | xfs_inode_buf_read_verify( | |
132 | struct xfs_buf *bp) | |
133 | { | |
d8914002 DC |
134 | xfs_inode_buf_verify(bp, false); |
135 | } | |
136 | ||
137 | static void | |
138 | xfs_inode_buf_readahead_verify( | |
139 | struct xfs_buf *bp) | |
140 | { | |
141 | xfs_inode_buf_verify(bp, true); | |
1fd7115e DC |
142 | } |
143 | ||
144 | static void | |
145 | xfs_inode_buf_write_verify( | |
146 | struct xfs_buf *bp) | |
147 | { | |
d8914002 | 148 | xfs_inode_buf_verify(bp, false); |
1fd7115e DC |
149 | } |
150 | ||
151 | const struct xfs_buf_ops xfs_inode_buf_ops = { | |
233135b7 | 152 | .name = "xfs_inode", |
1fd7115e DC |
153 | .verify_read = xfs_inode_buf_read_verify, |
154 | .verify_write = xfs_inode_buf_write_verify, | |
155 | }; | |
156 | ||
d8914002 | 157 | const struct xfs_buf_ops xfs_inode_buf_ra_ops = { |
233135b7 | 158 | .name = "xxfs_inode_ra", |
d8914002 DC |
159 | .verify_read = xfs_inode_buf_readahead_verify, |
160 | .verify_write = xfs_inode_buf_write_verify, | |
161 | }; | |
162 | ||
1fd7115e DC |
163 | |
164 | /* | |
165 | * This routine is called to map an inode to the buffer containing the on-disk | |
166 | * version of the inode. It returns a pointer to the buffer containing the | |
167 | * on-disk inode in the bpp parameter, and in the dipp parameter it returns a | |
168 | * pointer to the on-disk inode within that buffer. | |
169 | * | |
170 | * If a non-zero error is returned, then the contents of bpp and dipp are | |
171 | * undefined. | |
172 | */ | |
173 | int | |
174 | xfs_imap_to_bp( | |
175 | struct xfs_mount *mp, | |
176 | struct xfs_trans *tp, | |
177 | struct xfs_imap *imap, | |
178 | struct xfs_dinode **dipp, | |
179 | struct xfs_buf **bpp, | |
180 | uint buf_flags, | |
181 | uint iget_flags) | |
182 | { | |
183 | struct xfs_buf *bp; | |
184 | int error; | |
185 | ||
186 | buf_flags |= XBF_UNMAPPED; | |
187 | error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, imap->im_blkno, | |
188 | (int)imap->im_len, buf_flags, &bp, | |
189 | &xfs_inode_buf_ops); | |
190 | if (error) { | |
2451337d | 191 | if (error == -EAGAIN) { |
1fd7115e DC |
192 | ASSERT(buf_flags & XBF_TRYLOCK); |
193 | return error; | |
194 | } | |
195 | ||
2451337d | 196 | if (error == -EFSCORRUPTED && |
1fd7115e | 197 | (iget_flags & XFS_IGET_UNTRUSTED)) |
2451337d | 198 | return -EINVAL; |
1fd7115e DC |
199 | |
200 | xfs_warn(mp, "%s: xfs_trans_read_buf() returned error %d.", | |
201 | __func__, error); | |
202 | return error; | |
203 | } | |
204 | ||
205 | *bpp = bp; | |
88ee2df7 | 206 | *dipp = xfs_buf_offset(bp, imap->im_boffset); |
1fd7115e DC |
207 | return 0; |
208 | } | |
209 | ||
638f4416 | 210 | void |
3987848c DC |
211 | xfs_inode_from_disk( |
212 | struct xfs_inode *ip, | |
f8d55aa0 | 213 | struct xfs_dinode *from) |
1fd7115e | 214 | { |
3987848c DC |
215 | struct xfs_icdinode *to = &ip->i_d; |
216 | struct inode *inode = VFS_I(ip); | |
217 | ||
faeb4e47 DC |
218 | |
219 | /* | |
220 | * Convert v1 inodes immediately to v2 inode format as this is the | |
221 | * minimum inode version format we support in the rest of the code. | |
222 | */ | |
c19b3b05 | 223 | to->di_version = from->di_version; |
faeb4e47 | 224 | if (to->di_version == 1) { |
54d7b5c1 | 225 | set_nlink(inode, be16_to_cpu(from->di_onlink)); |
faeb4e47 DC |
226 | to->di_projid_lo = 0; |
227 | to->di_projid_hi = 0; | |
228 | to->di_version = 2; | |
229 | } else { | |
54d7b5c1 | 230 | set_nlink(inode, be32_to_cpu(from->di_nlink)); |
faeb4e47 DC |
231 | to->di_projid_lo = be16_to_cpu(from->di_projid_lo); |
232 | to->di_projid_hi = be16_to_cpu(from->di_projid_hi); | |
233 | } | |
234 | ||
1fd7115e | 235 | to->di_format = from->di_format; |
1fd7115e DC |
236 | to->di_uid = be32_to_cpu(from->di_uid); |
237 | to->di_gid = be32_to_cpu(from->di_gid); | |
1fd7115e | 238 | to->di_flushiter = be16_to_cpu(from->di_flushiter); |
3987848c DC |
239 | |
240 | /* | |
241 | * Time is signed, so need to convert to signed 32 bit before | |
242 | * storing in inode timestamp which may be 64 bit. Otherwise | |
243 | * a time before epoch is converted to a time long after epoch | |
244 | * on 64 bit systems. | |
245 | */ | |
246 | inode->i_atime.tv_sec = (int)be32_to_cpu(from->di_atime.t_sec); | |
247 | inode->i_atime.tv_nsec = (int)be32_to_cpu(from->di_atime.t_nsec); | |
248 | inode->i_mtime.tv_sec = (int)be32_to_cpu(from->di_mtime.t_sec); | |
249 | inode->i_mtime.tv_nsec = (int)be32_to_cpu(from->di_mtime.t_nsec); | |
250 | inode->i_ctime.tv_sec = (int)be32_to_cpu(from->di_ctime.t_sec); | |
251 | inode->i_ctime.tv_nsec = (int)be32_to_cpu(from->di_ctime.t_nsec); | |
9e9a2674 | 252 | inode->i_generation = be32_to_cpu(from->di_gen); |
c19b3b05 | 253 | inode->i_mode = be16_to_cpu(from->di_mode); |
3987848c | 254 | |
1fd7115e DC |
255 | to->di_size = be64_to_cpu(from->di_size); |
256 | to->di_nblocks = be64_to_cpu(from->di_nblocks); | |
257 | to->di_extsize = be32_to_cpu(from->di_extsize); | |
258 | to->di_nextents = be32_to_cpu(from->di_nextents); | |
259 | to->di_anextents = be16_to_cpu(from->di_anextents); | |
260 | to->di_forkoff = from->di_forkoff; | |
261 | to->di_aformat = from->di_aformat; | |
262 | to->di_dmevmask = be32_to_cpu(from->di_dmevmask); | |
263 | to->di_dmstate = be16_to_cpu(from->di_dmstate); | |
264 | to->di_flags = be16_to_cpu(from->di_flags); | |
1fd7115e DC |
265 | |
266 | if (to->di_version == 3) { | |
83e06f21 | 267 | inode->i_version = be64_to_cpu(from->di_changecount); |
1fd7115e DC |
268 | to->di_crtime.t_sec = be32_to_cpu(from->di_crtime.t_sec); |
269 | to->di_crtime.t_nsec = be32_to_cpu(from->di_crtime.t_nsec); | |
270 | to->di_flags2 = be64_to_cpu(from->di_flags2); | |
f7ca3522 | 271 | to->di_cowextsize = be32_to_cpu(from->di_cowextsize); |
1fd7115e DC |
272 | } |
273 | } | |
274 | ||
275 | void | |
3987848c DC |
276 | xfs_inode_to_disk( |
277 | struct xfs_inode *ip, | |
93f958f9 DC |
278 | struct xfs_dinode *to, |
279 | xfs_lsn_t lsn) | |
3987848c DC |
280 | { |
281 | struct xfs_icdinode *from = &ip->i_d; | |
282 | struct inode *inode = VFS_I(ip); | |
283 | ||
93f958f9 | 284 | to->di_magic = cpu_to_be16(XFS_DINODE_MAGIC); |
faeb4e47 | 285 | to->di_onlink = 0; |
93f958f9 | 286 | |
93f958f9 | 287 | to->di_version = from->di_version; |
3987848c | 288 | to->di_format = from->di_format; |
3987848c DC |
289 | to->di_uid = cpu_to_be32(from->di_uid); |
290 | to->di_gid = cpu_to_be32(from->di_gid); | |
3987848c DC |
291 | to->di_projid_lo = cpu_to_be16(from->di_projid_lo); |
292 | to->di_projid_hi = cpu_to_be16(from->di_projid_hi); | |
3987848c | 293 | |
93f958f9 | 294 | memset(to->di_pad, 0, sizeof(to->di_pad)); |
3987848c DC |
295 | to->di_atime.t_sec = cpu_to_be32(inode->i_atime.tv_sec); |
296 | to->di_atime.t_nsec = cpu_to_be32(inode->i_atime.tv_nsec); | |
297 | to->di_mtime.t_sec = cpu_to_be32(inode->i_mtime.tv_sec); | |
298 | to->di_mtime.t_nsec = cpu_to_be32(inode->i_mtime.tv_nsec); | |
299 | to->di_ctime.t_sec = cpu_to_be32(inode->i_ctime.tv_sec); | |
300 | to->di_ctime.t_nsec = cpu_to_be32(inode->i_ctime.tv_nsec); | |
54d7b5c1 | 301 | to->di_nlink = cpu_to_be32(inode->i_nlink); |
9e9a2674 | 302 | to->di_gen = cpu_to_be32(inode->i_generation); |
c19b3b05 | 303 | to->di_mode = cpu_to_be16(inode->i_mode); |
3987848c DC |
304 | |
305 | to->di_size = cpu_to_be64(from->di_size); | |
306 | to->di_nblocks = cpu_to_be64(from->di_nblocks); | |
307 | to->di_extsize = cpu_to_be32(from->di_extsize); | |
308 | to->di_nextents = cpu_to_be32(from->di_nextents); | |
309 | to->di_anextents = cpu_to_be16(from->di_anextents); | |
310 | to->di_forkoff = from->di_forkoff; | |
311 | to->di_aformat = from->di_aformat; | |
312 | to->di_dmevmask = cpu_to_be32(from->di_dmevmask); | |
313 | to->di_dmstate = cpu_to_be16(from->di_dmstate); | |
314 | to->di_flags = cpu_to_be16(from->di_flags); | |
3987848c DC |
315 | |
316 | if (from->di_version == 3) { | |
83e06f21 | 317 | to->di_changecount = cpu_to_be64(inode->i_version); |
3987848c DC |
318 | to->di_crtime.t_sec = cpu_to_be32(from->di_crtime.t_sec); |
319 | to->di_crtime.t_nsec = cpu_to_be32(from->di_crtime.t_nsec); | |
320 | to->di_flags2 = cpu_to_be64(from->di_flags2); | |
f7ca3522 | 321 | to->di_cowextsize = cpu_to_be32(from->di_cowextsize); |
93f958f9 DC |
322 | to->di_ino = cpu_to_be64(ip->i_ino); |
323 | to->di_lsn = cpu_to_be64(lsn); | |
324 | memset(to->di_pad2, 0, sizeof(to->di_pad2)); | |
325 | uuid_copy(&to->di_uuid, &ip->i_mount->m_sb.sb_meta_uuid); | |
3987848c DC |
326 | to->di_flushiter = 0; |
327 | } else { | |
328 | to->di_flushiter = cpu_to_be16(from->di_flushiter); | |
329 | } | |
330 | } | |
331 | ||
332 | void | |
333 | xfs_log_dinode_to_disk( | |
334 | struct xfs_log_dinode *from, | |
335 | struct xfs_dinode *to) | |
1fd7115e DC |
336 | { |
337 | to->di_magic = cpu_to_be16(from->di_magic); | |
338 | to->di_mode = cpu_to_be16(from->di_mode); | |
faeb4e47 | 339 | to->di_version = from->di_version; |
1fd7115e | 340 | to->di_format = from->di_format; |
faeb4e47 | 341 | to->di_onlink = 0; |
1fd7115e DC |
342 | to->di_uid = cpu_to_be32(from->di_uid); |
343 | to->di_gid = cpu_to_be32(from->di_gid); | |
344 | to->di_nlink = cpu_to_be32(from->di_nlink); | |
345 | to->di_projid_lo = cpu_to_be16(from->di_projid_lo); | |
346 | to->di_projid_hi = cpu_to_be16(from->di_projid_hi); | |
347 | memcpy(to->di_pad, from->di_pad, sizeof(to->di_pad)); | |
3987848c | 348 | |
1fd7115e DC |
349 | to->di_atime.t_sec = cpu_to_be32(from->di_atime.t_sec); |
350 | to->di_atime.t_nsec = cpu_to_be32(from->di_atime.t_nsec); | |
351 | to->di_mtime.t_sec = cpu_to_be32(from->di_mtime.t_sec); | |
352 | to->di_mtime.t_nsec = cpu_to_be32(from->di_mtime.t_nsec); | |
353 | to->di_ctime.t_sec = cpu_to_be32(from->di_ctime.t_sec); | |
354 | to->di_ctime.t_nsec = cpu_to_be32(from->di_ctime.t_nsec); | |
3987848c | 355 | |
1fd7115e DC |
356 | to->di_size = cpu_to_be64(from->di_size); |
357 | to->di_nblocks = cpu_to_be64(from->di_nblocks); | |
358 | to->di_extsize = cpu_to_be32(from->di_extsize); | |
359 | to->di_nextents = cpu_to_be32(from->di_nextents); | |
360 | to->di_anextents = cpu_to_be16(from->di_anextents); | |
361 | to->di_forkoff = from->di_forkoff; | |
362 | to->di_aformat = from->di_aformat; | |
363 | to->di_dmevmask = cpu_to_be32(from->di_dmevmask); | |
364 | to->di_dmstate = cpu_to_be16(from->di_dmstate); | |
365 | to->di_flags = cpu_to_be16(from->di_flags); | |
366 | to->di_gen = cpu_to_be32(from->di_gen); | |
367 | ||
368 | if (from->di_version == 3) { | |
369 | to->di_changecount = cpu_to_be64(from->di_changecount); | |
370 | to->di_crtime.t_sec = cpu_to_be32(from->di_crtime.t_sec); | |
371 | to->di_crtime.t_nsec = cpu_to_be32(from->di_crtime.t_nsec); | |
372 | to->di_flags2 = cpu_to_be64(from->di_flags2); | |
f7ca3522 | 373 | to->di_cowextsize = cpu_to_be32(from->di_cowextsize); |
1fd7115e DC |
374 | to->di_ino = cpu_to_be64(from->di_ino); |
375 | to->di_lsn = cpu_to_be64(from->di_lsn); | |
376 | memcpy(to->di_pad2, from->di_pad2, sizeof(to->di_pad2)); | |
377 | uuid_copy(&to->di_uuid, &from->di_uuid); | |
378 | to->di_flushiter = 0; | |
379 | } else { | |
380 | to->di_flushiter = cpu_to_be16(from->di_flushiter); | |
381 | } | |
382 | } | |
383 | ||
384 | static bool | |
385 | xfs_dinode_verify( | |
386 | struct xfs_mount *mp, | |
420fbeb4 | 387 | xfs_ino_t ino, |
1fd7115e DC |
388 | struct xfs_dinode *dip) |
389 | { | |
3c6f46ea | 390 | uint16_t mode; |
c8e156ac DW |
391 | uint16_t flags; |
392 | uint64_t flags2; | |
393 | ||
1fd7115e DC |
394 | if (dip->di_magic != cpu_to_be16(XFS_DINODE_MAGIC)) |
395 | return false; | |
396 | ||
ef388e20 DW |
397 | /* don't allow invalid i_size */ |
398 | if (be64_to_cpu(dip->di_size) & (1ULL << 63)) | |
399 | return false; | |
400 | ||
3c6f46ea | 401 | mode = be16_to_cpu(dip->di_mode); |
a324cbf1 AG |
402 | if (mode && xfs_mode_to_ftype(mode) == XFS_DIR3_FT_UNKNOWN) |
403 | return false; | |
3c6f46ea AG |
404 | |
405 | /* No zero-length symlinks/dirs. */ | |
406 | if ((S_ISLNK(mode) || S_ISDIR(mode)) && dip->di_size == 0) | |
ef388e20 DW |
407 | return false; |
408 | ||
1fd7115e DC |
409 | /* only version 3 or greater inodes are extensively verified here */ |
410 | if (dip->di_version < 3) | |
411 | return true; | |
412 | ||
413 | if (!xfs_sb_version_hascrc(&mp->m_sb)) | |
414 | return false; | |
415 | if (!xfs_verify_cksum((char *)dip, mp->m_sb.sb_inodesize, | |
533b81c8 | 416 | XFS_DINODE_CRC_OFF)) |
1fd7115e | 417 | return false; |
420fbeb4 | 418 | if (be64_to_cpu(dip->di_ino) != ino) |
1fd7115e | 419 | return false; |
ce748eaa | 420 | if (!uuid_equal(&dip->di_uuid, &mp->m_sb.sb_meta_uuid)) |
1fd7115e | 421 | return false; |
c8e156ac DW |
422 | |
423 | flags = be16_to_cpu(dip->di_flags); | |
424 | flags2 = be64_to_cpu(dip->di_flags2); | |
425 | ||
426 | /* don't allow reflink/cowextsize if we don't have reflink */ | |
427 | if ((flags2 & (XFS_DIFLAG2_REFLINK | XFS_DIFLAG2_COWEXTSIZE)) && | |
428 | !xfs_sb_version_hasreflink(&mp->m_sb)) | |
429 | return false; | |
430 | ||
431 | /* don't let reflink and realtime mix */ | |
432 | if ((flags2 & XFS_DIFLAG2_REFLINK) && (flags & XFS_DIFLAG_REALTIME)) | |
433 | return false; | |
434 | ||
4f435ebe DW |
435 | /* don't let reflink and dax mix */ |
436 | if ((flags2 & XFS_DIFLAG2_REFLINK) && (flags2 & XFS_DIFLAG2_DAX)) | |
437 | return false; | |
438 | ||
1fd7115e DC |
439 | return true; |
440 | } | |
441 | ||
442 | void | |
443 | xfs_dinode_calc_crc( | |
444 | struct xfs_mount *mp, | |
445 | struct xfs_dinode *dip) | |
446 | { | |
447 | __uint32_t crc; | |
448 | ||
449 | if (dip->di_version < 3) | |
450 | return; | |
451 | ||
452 | ASSERT(xfs_sb_version_hascrc(&mp->m_sb)); | |
cae028df | 453 | crc = xfs_start_cksum_update((char *)dip, mp->m_sb.sb_inodesize, |
533b81c8 | 454 | XFS_DINODE_CRC_OFF); |
1fd7115e DC |
455 | dip->di_crc = xfs_end_cksum(crc); |
456 | } | |
457 | ||
458 | /* | |
459 | * Read the disk inode attributes into the in-core inode structure. | |
460 | * | |
461 | * For version 5 superblocks, if we are initialising a new inode and we are not | |
462 | * utilising the XFS_MOUNT_IKEEP inode cluster mode, we can simple build the new | |
463 | * inode core with a random generation number. If we are keeping inodes around, | |
464 | * we need to read the inode cluster to get the existing generation number off | |
465 | * disk. Further, if we are using version 4 superblocks (i.e. v1/v2 inode | |
466 | * format) then log recovery is dependent on the di_flushiter field being | |
467 | * initialised from the current on-disk value and hence we must also read the | |
468 | * inode off disk. | |
469 | */ | |
470 | int | |
471 | xfs_iread( | |
472 | xfs_mount_t *mp, | |
473 | xfs_trans_t *tp, | |
474 | xfs_inode_t *ip, | |
475 | uint iget_flags) | |
476 | { | |
477 | xfs_buf_t *bp; | |
478 | xfs_dinode_t *dip; | |
479 | int error; | |
480 | ||
481 | /* | |
482 | * Fill in the location information in the in-core inode. | |
483 | */ | |
484 | error = xfs_imap(mp, tp, ip->i_ino, &ip->i_imap, iget_flags); | |
485 | if (error) | |
486 | return error; | |
487 | ||
488 | /* shortcut IO on inode allocation if possible */ | |
489 | if ((iget_flags & XFS_IGET_CREATE) && | |
490 | xfs_sb_version_hascrc(&mp->m_sb) && | |
491 | !(mp->m_flags & XFS_MOUNT_IKEEP)) { | |
492 | /* initialise the on-disk inode core */ | |
493 | memset(&ip->i_d, 0, sizeof(ip->i_d)); | |
9e9a2674 | 494 | VFS_I(ip)->i_generation = prandom_u32(); |
93f958f9 | 495 | if (xfs_sb_version_hascrc(&mp->m_sb)) |
1fd7115e | 496 | ip->i_d.di_version = 3; |
93f958f9 | 497 | else |
1fd7115e DC |
498 | ip->i_d.di_version = 2; |
499 | return 0; | |
500 | } | |
501 | ||
502 | /* | |
503 | * Get pointers to the on-disk inode and the buffer containing it. | |
504 | */ | |
505 | error = xfs_imap_to_bp(mp, tp, &ip->i_imap, &dip, &bp, 0, iget_flags); | |
506 | if (error) | |
507 | return error; | |
508 | ||
509 | /* even unallocated inodes are verified */ | |
420fbeb4 | 510 | if (!xfs_dinode_verify(mp, ip->i_ino, dip)) { |
1fd7115e DC |
511 | xfs_alert(mp, "%s: validation failed for inode %lld failed", |
512 | __func__, ip->i_ino); | |
513 | ||
514 | XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, dip); | |
2451337d | 515 | error = -EFSCORRUPTED; |
1fd7115e DC |
516 | goto out_brelse; |
517 | } | |
518 | ||
519 | /* | |
520 | * If the on-disk inode is already linked to a directory | |
521 | * entry, copy all of the inode into the in-core inode. | |
522 | * xfs_iformat_fork() handles copying in the inode format | |
523 | * specific information. | |
524 | * Otherwise, just get the truly permanent information. | |
525 | */ | |
526 | if (dip->di_mode) { | |
3987848c | 527 | xfs_inode_from_disk(ip, dip); |
1fd7115e DC |
528 | error = xfs_iformat_fork(ip, dip); |
529 | if (error) { | |
530 | #ifdef DEBUG | |
531 | xfs_alert(mp, "%s: xfs_iformat() returned error %d", | |
532 | __func__, error); | |
533 | #endif /* DEBUG */ | |
534 | goto out_brelse; | |
535 | } | |
536 | } else { | |
537 | /* | |
538 | * Partial initialisation of the in-core inode. Just the bits | |
539 | * that xfs_ialloc won't overwrite or relies on being correct. | |
540 | */ | |
1fd7115e | 541 | ip->i_d.di_version = dip->di_version; |
9e9a2674 | 542 | VFS_I(ip)->i_generation = be32_to_cpu(dip->di_gen); |
1fd7115e DC |
543 | ip->i_d.di_flushiter = be16_to_cpu(dip->di_flushiter); |
544 | ||
1fd7115e DC |
545 | /* |
546 | * Make sure to pull in the mode here as well in | |
547 | * case the inode is released without being used. | |
548 | * This ensures that xfs_inactive() will see that | |
549 | * the inode is already free and not try to mess | |
550 | * with the uninitialized part of it. | |
551 | */ | |
c19b3b05 | 552 | VFS_I(ip)->i_mode = 0; |
1fd7115e DC |
553 | } |
554 | ||
faeb4e47 | 555 | ASSERT(ip->i_d.di_version >= 2); |
1fd7115e DC |
556 | ip->i_delayed_blks = 0; |
557 | ||
558 | /* | |
559 | * Mark the buffer containing the inode as something to keep | |
560 | * around for a while. This helps to keep recently accessed | |
561 | * meta-data in-core longer. | |
562 | */ | |
563 | xfs_buf_set_ref(bp, XFS_INO_REF); | |
564 | ||
565 | /* | |
566 | * Use xfs_trans_brelse() to release the buffer containing the on-disk | |
567 | * inode, because it was acquired with xfs_trans_read_buf() in | |
568 | * xfs_imap_to_bp() above. If tp is NULL, this is just a normal | |
569 | * brelse(). If we're within a transaction, then xfs_trans_brelse() | |
570 | * will only release the buffer if it is not dirty within the | |
571 | * transaction. It will be OK to release the buffer in this case, | |
572 | * because inodes on disk are never destroyed and we will be locking the | |
573 | * new in-core inode before putting it in the cache where other | |
574 | * processes can find it. Thus we don't have to worry about the inode | |
575 | * being changed just because we released the buffer. | |
576 | */ | |
577 | out_brelse: | |
578 | xfs_trans_brelse(tp, bp); | |
579 | return error; | |
580 | } |