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