2 * Copyright (c) 2000-2006 Silicon Graphics, Inc.
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.
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.
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
20 #include "xfs_format.h"
21 #include "xfs_shared.h"
23 #include "xfs_trans.h"
26 #include "xfs_mount.h"
27 #include "xfs_bmap_btree.h"
28 #include "xfs_ialloc_btree.h"
29 #include "xfs_dinode.h"
30 #include "xfs_inode.h"
31 #include "xfs_error.h"
32 #include "xfs_cksum.h"
33 #include "xfs_icache.h"
34 #include "xfs_ialloc.h"
37 * Check that none of the inode's in the buffer have a next
38 * unlinked field of 0.
50 j
= mp
->m_inode_cluster_size
>> mp
->m_sb
.sb_inodelog
;
52 for (i
= 0; i
< j
; i
++) {
53 dip
= (xfs_dinode_t
*)xfs_buf_offset(bp
,
54 i
* mp
->m_sb
.sb_inodesize
);
55 if (!dip
->di_next_unlinked
) {
57 "Detected bogus zero next_unlinked field in inode %d buffer 0x%llx.",
58 i
, (long long)bp
->b_bn
);
65 * If we are doing readahead on an inode buffer, we might be in log recovery
66 * reading an inode allocation buffer that hasn't yet been replayed, and hence
67 * has not had the inode cores stamped into it. Hence for readahead, the buffer
68 * may be potentially invalid.
70 * If the readahead buffer is invalid, we don't want to mark it with an error,
71 * but we do want to clear the DONE status of the buffer so that a followup read
72 * will re-read it from disk. This will ensure that we don't get an unnecessary
73 * warnings during log recovery and we don't get unnecssary panics on debug
81 struct xfs_mount
*mp
= bp
->b_target
->bt_mount
;
86 * Validate the magic number and version of every inode in the buffer
88 ni
= XFS_BB_TO_FSB(mp
, bp
->b_length
) * mp
->m_sb
.sb_inopblock
;
89 for (i
= 0; i
< ni
; i
++) {
93 dip
= (struct xfs_dinode
*)xfs_buf_offset(bp
,
94 (i
<< mp
->m_sb
.sb_inodelog
));
95 di_ok
= dip
->di_magic
== cpu_to_be16(XFS_DINODE_MAGIC
) &&
96 XFS_DINODE_GOOD_VERSION(dip
->di_version
);
97 if (unlikely(XFS_TEST_ERROR(!di_ok
, mp
,
98 XFS_ERRTAG_ITOBP_INOTOBP
,
99 XFS_RANDOM_ITOBP_INOTOBP
))) {
101 bp
->b_flags
&= ~XBF_DONE
;
105 xfs_buf_ioerror(bp
, EFSCORRUPTED
);
106 XFS_CORRUPTION_ERROR(__func__
, XFS_ERRLEVEL_HIGH
,
110 "bad inode magic/vsn daddr %lld #%d (magic=%x)",
111 (unsigned long long)bp
->b_bn
, i
,
112 be16_to_cpu(dip
->di_magic
));
116 xfs_inobp_check(mp
, bp
);
121 xfs_inode_buf_read_verify(
124 xfs_inode_buf_verify(bp
, false);
128 xfs_inode_buf_readahead_verify(
131 xfs_inode_buf_verify(bp
, true);
135 xfs_inode_buf_write_verify(
138 xfs_inode_buf_verify(bp
, false);
141 const struct xfs_buf_ops xfs_inode_buf_ops
= {
142 .verify_read
= xfs_inode_buf_read_verify
,
143 .verify_write
= xfs_inode_buf_write_verify
,
146 const struct xfs_buf_ops xfs_inode_buf_ra_ops
= {
147 .verify_read
= xfs_inode_buf_readahead_verify
,
148 .verify_write
= xfs_inode_buf_write_verify
,
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.
158 * If a non-zero error is returned, then the contents of bpp and dipp are
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
,
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
,
179 if (error
== EAGAIN
) {
180 ASSERT(buf_flags
& XBF_TRYLOCK
);
184 if (error
== EFSCORRUPTED
&&
185 (iget_flags
& XFS_IGET_UNTRUSTED
))
186 return XFS_ERROR(EINVAL
);
188 xfs_warn(mp
, "%s: xfs_trans_read_buf() returned error %d.",
194 *dipp
= (struct xfs_dinode
*)xfs_buf_offset(bp
, imap
->im_boffset
);
199 xfs_dinode_from_disk(
203 to
->di_magic
= be16_to_cpu(from
->di_magic
);
204 to
->di_mode
= be16_to_cpu(from
->di_mode
);
205 to
->di_version
= from
->di_version
;
206 to
->di_format
= from
->di_format
;
207 to
->di_onlink
= be16_to_cpu(from
->di_onlink
);
208 to
->di_uid
= be32_to_cpu(from
->di_uid
);
209 to
->di_gid
= be32_to_cpu(from
->di_gid
);
210 to
->di_nlink
= be32_to_cpu(from
->di_nlink
);
211 to
->di_projid_lo
= be16_to_cpu(from
->di_projid_lo
);
212 to
->di_projid_hi
= be16_to_cpu(from
->di_projid_hi
);
213 memcpy(to
->di_pad
, from
->di_pad
, sizeof(to
->di_pad
));
214 to
->di_flushiter
= be16_to_cpu(from
->di_flushiter
);
215 to
->di_atime
.t_sec
= be32_to_cpu(from
->di_atime
.t_sec
);
216 to
->di_atime
.t_nsec
= be32_to_cpu(from
->di_atime
.t_nsec
);
217 to
->di_mtime
.t_sec
= be32_to_cpu(from
->di_mtime
.t_sec
);
218 to
->di_mtime
.t_nsec
= be32_to_cpu(from
->di_mtime
.t_nsec
);
219 to
->di_ctime
.t_sec
= be32_to_cpu(from
->di_ctime
.t_sec
);
220 to
->di_ctime
.t_nsec
= be32_to_cpu(from
->di_ctime
.t_nsec
);
221 to
->di_size
= be64_to_cpu(from
->di_size
);
222 to
->di_nblocks
= be64_to_cpu(from
->di_nblocks
);
223 to
->di_extsize
= be32_to_cpu(from
->di_extsize
);
224 to
->di_nextents
= be32_to_cpu(from
->di_nextents
);
225 to
->di_anextents
= be16_to_cpu(from
->di_anextents
);
226 to
->di_forkoff
= from
->di_forkoff
;
227 to
->di_aformat
= from
->di_aformat
;
228 to
->di_dmevmask
= be32_to_cpu(from
->di_dmevmask
);
229 to
->di_dmstate
= be16_to_cpu(from
->di_dmstate
);
230 to
->di_flags
= be16_to_cpu(from
->di_flags
);
231 to
->di_gen
= be32_to_cpu(from
->di_gen
);
233 if (to
->di_version
== 3) {
234 to
->di_changecount
= be64_to_cpu(from
->di_changecount
);
235 to
->di_crtime
.t_sec
= be32_to_cpu(from
->di_crtime
.t_sec
);
236 to
->di_crtime
.t_nsec
= be32_to_cpu(from
->di_crtime
.t_nsec
);
237 to
->di_flags2
= be64_to_cpu(from
->di_flags2
);
238 to
->di_ino
= be64_to_cpu(from
->di_ino
);
239 to
->di_lsn
= be64_to_cpu(from
->di_lsn
);
240 memcpy(to
->di_pad2
, from
->di_pad2
, sizeof(to
->di_pad2
));
241 uuid_copy(&to
->di_uuid
, &from
->di_uuid
);
248 xfs_icdinode_t
*from
)
250 to
->di_magic
= cpu_to_be16(from
->di_magic
);
251 to
->di_mode
= cpu_to_be16(from
->di_mode
);
252 to
->di_version
= from
->di_version
;
253 to
->di_format
= from
->di_format
;
254 to
->di_onlink
= cpu_to_be16(from
->di_onlink
);
255 to
->di_uid
= cpu_to_be32(from
->di_uid
);
256 to
->di_gid
= cpu_to_be32(from
->di_gid
);
257 to
->di_nlink
= cpu_to_be32(from
->di_nlink
);
258 to
->di_projid_lo
= cpu_to_be16(from
->di_projid_lo
);
259 to
->di_projid_hi
= cpu_to_be16(from
->di_projid_hi
);
260 memcpy(to
->di_pad
, from
->di_pad
, sizeof(to
->di_pad
));
261 to
->di_atime
.t_sec
= cpu_to_be32(from
->di_atime
.t_sec
);
262 to
->di_atime
.t_nsec
= cpu_to_be32(from
->di_atime
.t_nsec
);
263 to
->di_mtime
.t_sec
= cpu_to_be32(from
->di_mtime
.t_sec
);
264 to
->di_mtime
.t_nsec
= cpu_to_be32(from
->di_mtime
.t_nsec
);
265 to
->di_ctime
.t_sec
= cpu_to_be32(from
->di_ctime
.t_sec
);
266 to
->di_ctime
.t_nsec
= cpu_to_be32(from
->di_ctime
.t_nsec
);
267 to
->di_size
= cpu_to_be64(from
->di_size
);
268 to
->di_nblocks
= cpu_to_be64(from
->di_nblocks
);
269 to
->di_extsize
= cpu_to_be32(from
->di_extsize
);
270 to
->di_nextents
= cpu_to_be32(from
->di_nextents
);
271 to
->di_anextents
= cpu_to_be16(from
->di_anextents
);
272 to
->di_forkoff
= from
->di_forkoff
;
273 to
->di_aformat
= from
->di_aformat
;
274 to
->di_dmevmask
= cpu_to_be32(from
->di_dmevmask
);
275 to
->di_dmstate
= cpu_to_be16(from
->di_dmstate
);
276 to
->di_flags
= cpu_to_be16(from
->di_flags
);
277 to
->di_gen
= cpu_to_be32(from
->di_gen
);
279 if (from
->di_version
== 3) {
280 to
->di_changecount
= cpu_to_be64(from
->di_changecount
);
281 to
->di_crtime
.t_sec
= cpu_to_be32(from
->di_crtime
.t_sec
);
282 to
->di_crtime
.t_nsec
= cpu_to_be32(from
->di_crtime
.t_nsec
);
283 to
->di_flags2
= cpu_to_be64(from
->di_flags2
);
284 to
->di_ino
= cpu_to_be64(from
->di_ino
);
285 to
->di_lsn
= cpu_to_be64(from
->di_lsn
);
286 memcpy(to
->di_pad2
, from
->di_pad2
, sizeof(to
->di_pad2
));
287 uuid_copy(&to
->di_uuid
, &from
->di_uuid
);
288 to
->di_flushiter
= 0;
290 to
->di_flushiter
= cpu_to_be16(from
->di_flushiter
);
296 struct xfs_mount
*mp
,
297 struct xfs_inode
*ip
,
298 struct xfs_dinode
*dip
)
300 if (dip
->di_magic
!= cpu_to_be16(XFS_DINODE_MAGIC
))
303 /* only version 3 or greater inodes are extensively verified here */
304 if (dip
->di_version
< 3)
307 if (!xfs_sb_version_hascrc(&mp
->m_sb
))
309 if (!xfs_verify_cksum((char *)dip
, mp
->m_sb
.sb_inodesize
,
310 offsetof(struct xfs_dinode
, di_crc
)))
312 if (be64_to_cpu(dip
->di_ino
) != ip
->i_ino
)
314 if (!uuid_equal(&dip
->di_uuid
, &mp
->m_sb
.sb_uuid
))
321 struct xfs_mount
*mp
,
322 struct xfs_dinode
*dip
)
326 if (dip
->di_version
< 3)
329 ASSERT(xfs_sb_version_hascrc(&mp
->m_sb
));
330 crc
= xfs_start_cksum((char *)dip
, mp
->m_sb
.sb_inodesize
,
331 offsetof(struct xfs_dinode
, di_crc
));
332 dip
->di_crc
= xfs_end_cksum(crc
);
336 * Read the disk inode attributes into the in-core inode structure.
338 * For version 5 superblocks, if we are initialising a new inode and we are not
339 * utilising the XFS_MOUNT_IKEEP inode cluster mode, we can simple build the new
340 * inode core with a random generation number. If we are keeping inodes around,
341 * we need to read the inode cluster to get the existing generation number off
342 * disk. Further, if we are using version 4 superblocks (i.e. v1/v2 inode
343 * format) then log recovery is dependent on the di_flushiter field being
344 * initialised from the current on-disk value and hence we must also read the
359 * Fill in the location information in the in-core inode.
361 error
= xfs_imap(mp
, tp
, ip
->i_ino
, &ip
->i_imap
, iget_flags
);
365 /* shortcut IO on inode allocation if possible */
366 if ((iget_flags
& XFS_IGET_CREATE
) &&
367 xfs_sb_version_hascrc(&mp
->m_sb
) &&
368 !(mp
->m_flags
& XFS_MOUNT_IKEEP
)) {
369 /* initialise the on-disk inode core */
370 memset(&ip
->i_d
, 0, sizeof(ip
->i_d
));
371 ip
->i_d
.di_magic
= XFS_DINODE_MAGIC
;
372 ip
->i_d
.di_gen
= prandom_u32();
373 if (xfs_sb_version_hascrc(&mp
->m_sb
)) {
374 ip
->i_d
.di_version
= 3;
375 ip
->i_d
.di_ino
= ip
->i_ino
;
376 uuid_copy(&ip
->i_d
.di_uuid
, &mp
->m_sb
.sb_uuid
);
378 ip
->i_d
.di_version
= 2;
383 * Get pointers to the on-disk inode and the buffer containing it.
385 error
= xfs_imap_to_bp(mp
, tp
, &ip
->i_imap
, &dip
, &bp
, 0, iget_flags
);
389 /* even unallocated inodes are verified */
390 if (!xfs_dinode_verify(mp
, ip
, dip
)) {
391 xfs_alert(mp
, "%s: validation failed for inode %lld failed",
392 __func__
, ip
->i_ino
);
394 XFS_CORRUPTION_ERROR(__func__
, XFS_ERRLEVEL_LOW
, mp
, dip
);
395 error
= XFS_ERROR(EFSCORRUPTED
);
400 * If the on-disk inode is already linked to a directory
401 * entry, copy all of the inode into the in-core inode.
402 * xfs_iformat_fork() handles copying in the inode format
403 * specific information.
404 * Otherwise, just get the truly permanent information.
407 xfs_dinode_from_disk(&ip
->i_d
, dip
);
408 error
= xfs_iformat_fork(ip
, dip
);
411 xfs_alert(mp
, "%s: xfs_iformat() returned error %d",
418 * Partial initialisation of the in-core inode. Just the bits
419 * that xfs_ialloc won't overwrite or relies on being correct.
421 ip
->i_d
.di_magic
= be16_to_cpu(dip
->di_magic
);
422 ip
->i_d
.di_version
= dip
->di_version
;
423 ip
->i_d
.di_gen
= be32_to_cpu(dip
->di_gen
);
424 ip
->i_d
.di_flushiter
= be16_to_cpu(dip
->di_flushiter
);
426 if (dip
->di_version
== 3) {
427 ip
->i_d
.di_ino
= be64_to_cpu(dip
->di_ino
);
428 uuid_copy(&ip
->i_d
.di_uuid
, &dip
->di_uuid
);
432 * Make sure to pull in the mode here as well in
433 * case the inode is released without being used.
434 * This ensures that xfs_inactive() will see that
435 * the inode is already free and not try to mess
436 * with the uninitialized part of it.
442 * The inode format changed when we moved the link count and
443 * made it 32 bits long. If this is an old format inode,
444 * convert it in memory to look like a new one. If it gets
445 * flushed to disk we will convert back before flushing or
446 * logging it. We zero out the new projid field and the old link
447 * count field. We'll handle clearing the pad field (the remains
448 * of the old uuid field) when we actually convert the inode to
449 * the new format. We don't change the version number so that we
450 * can distinguish this from a real new format inode.
452 if (ip
->i_d
.di_version
== 1) {
453 ip
->i_d
.di_nlink
= ip
->i_d
.di_onlink
;
454 ip
->i_d
.di_onlink
= 0;
455 xfs_set_projid(ip
, 0);
458 ip
->i_delayed_blks
= 0;
461 * Mark the buffer containing the inode as something to keep
462 * around for a while. This helps to keep recently accessed
463 * meta-data in-core longer.
465 xfs_buf_set_ref(bp
, XFS_INO_REF
);
468 * Use xfs_trans_brelse() to release the buffer containing the on-disk
469 * inode, because it was acquired with xfs_trans_read_buf() in
470 * xfs_imap_to_bp() above. If tp is NULL, this is just a normal
471 * brelse(). If we're within a transaction, then xfs_trans_brelse()
472 * will only release the buffer if it is not dirty within the
473 * transaction. It will be OK to release the buffer in this case,
474 * because inodes on disk are never destroyed and we will be locking the
475 * new in-core inode before putting it in the cache where other
476 * processes can find it. Thus we don't have to worry about the inode
477 * being changed just because we released the buffer.
480 xfs_trans_brelse(tp
, bp
);