1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (c) 2000-2006 Silicon Graphics, Inc.
4 * Copyright (c) 2013 Red Hat, Inc.
7 #include "libxfs_priv.h"
9 #include "xfs_shared.h"
10 #include "xfs_format.h"
11 #include "xfs_log_format.h"
12 #include "xfs_trans_resv.h"
13 #include "xfs_mount.h"
14 #include "xfs_inode.h"
15 #include "xfs_trans.h"
16 #include "xfs_cksum.h"
17 #include "xfs_trace.h"
18 #include "xfs_quota_defs.h"
21 xfs_calc_dquots_per_chunk(
22 unsigned int nbblks
) /* basic block units */
25 return BBTOB(nbblks
) / sizeof(xfs_dqblk_t
);
29 * Do some primitive error checking on ondisk dquot data structures.
31 * The xfs_dqblk structure /contains/ the xfs_disk_dquot structure;
32 * we verify them separately because at some points we have only the
33 * smaller xfs_disk_dquot structure available.
39 xfs_disk_dquot_t
*ddq
,
41 uint type
) /* used only during quotacheck */
44 * We can encounter an uninitialized dquot buffer for 2 reasons:
45 * 1. If we crash while deleting the quotainode(s), and those blks got
46 * used for user data. This is because we take the path of regular
47 * file deletion; however, the size field of quotainodes is never
48 * updated, so all the tricks that we play in itruncate_finish
51 * 2. We don't play the quota buffers when there's a quotaoff logitem.
52 * But the allocation will be replayed so we'll end up with an
53 * uninitialized quota block.
55 * This is all fine; things are still consistent, and we haven't lost
56 * any quota information. Just don't complain about bad dquot blks.
58 if (ddq
->d_magic
!= cpu_to_be16(XFS_DQUOT_MAGIC
))
59 return __this_address
;
60 if (ddq
->d_version
!= XFS_DQUOT_VERSION
)
61 return __this_address
;
63 if (type
&& ddq
->d_flags
!= type
)
64 return __this_address
;
65 if (ddq
->d_flags
!= XFS_DQ_USER
&&
66 ddq
->d_flags
!= XFS_DQ_PROJ
&&
67 ddq
->d_flags
!= XFS_DQ_GROUP
)
68 return __this_address
;
70 if (id
!= -1 && id
!= be32_to_cpu(ddq
->d_id
))
71 return __this_address
;
76 if (ddq
->d_blk_softlimit
&&
77 be64_to_cpu(ddq
->d_bcount
) > be64_to_cpu(ddq
->d_blk_softlimit
) &&
79 return __this_address
;
81 if (ddq
->d_ino_softlimit
&&
82 be64_to_cpu(ddq
->d_icount
) > be64_to_cpu(ddq
->d_ino_softlimit
) &&
84 return __this_address
;
86 if (ddq
->d_rtb_softlimit
&&
87 be64_to_cpu(ddq
->d_rtbcount
) > be64_to_cpu(ddq
->d_rtb_softlimit
) &&
89 return __this_address
;
97 struct xfs_dqblk
*dqb
,
99 uint type
) /* used only during quotacheck */
101 if (xfs_sb_version_hascrc(&mp
->m_sb
) &&
102 !uuid_equal(&dqb
->dd_uuid
, &mp
->m_sb
.sb_meta_uuid
))
103 return __this_address
;
105 return xfs_dquot_verify(mp
, &dqb
->dd_diskdq
, id
, type
);
109 * Do some primitive error checking on ondisk dquot data structures.
113 struct xfs_mount
*mp
,
114 struct xfs_dqblk
*dqb
,
119 * Typically, a repair is only requested by quotacheck.
122 memset(dqb
, 0, sizeof(xfs_dqblk_t
));
124 dqb
->dd_diskdq
.d_magic
= cpu_to_be16(XFS_DQUOT_MAGIC
);
125 dqb
->dd_diskdq
.d_version
= XFS_DQUOT_VERSION
;
126 dqb
->dd_diskdq
.d_flags
= type
;
127 dqb
->dd_diskdq
.d_id
= cpu_to_be32(id
);
129 if (xfs_sb_version_hascrc(&mp
->m_sb
)) {
130 uuid_copy(&dqb
->dd_uuid
, &mp
->m_sb
.sb_meta_uuid
);
131 xfs_update_cksum((char *)dqb
, sizeof(struct xfs_dqblk
),
139 xfs_dquot_buf_verify_crc(
140 struct xfs_mount
*mp
,
144 struct xfs_dqblk
*d
= (struct xfs_dqblk
*)bp
->b_addr
;
148 if (!xfs_sb_version_hascrc(&mp
->m_sb
))
152 * if we are in log recovery, the quota subsystem has not been
153 * initialised so we have no quotainfo structure. In that case, we need
154 * to manually calculate the number of dquots in the buffer.
157 ndquots
= mp
->m_quotainfo
->qi_dqperchunk
;
159 ndquots
= xfs_calc_dquots_per_chunk(bp
->b_length
);
161 for (i
= 0; i
< ndquots
; i
++, d
++) {
162 if (!xfs_verify_cksum((char *)d
, sizeof(struct xfs_dqblk
),
163 XFS_DQUOT_CRC_OFF
)) {
165 xfs_buf_verifier_error(bp
, -EFSBADCRC
, __func__
,
166 d
, sizeof(*d
), __this_address
);
173 STATIC xfs_failaddr_t
174 xfs_dquot_buf_verify(
175 struct xfs_mount
*mp
,
179 struct xfs_dqblk
*dqb
= bp
->b_addr
;
186 * if we are in log recovery, the quota subsystem has not been
187 * initialised so we have no quotainfo structure. In that case, we need
188 * to manually calculate the number of dquots in the buffer.
191 ndquots
= mp
->m_quotainfo
->qi_dqperchunk
;
193 ndquots
= xfs_calc_dquots_per_chunk(bp
->b_length
);
196 * On the first read of the buffer, verify that each dquot is valid.
197 * We don't know what the id of the dquot is supposed to be, just that
198 * they should be increasing monotonically within the buffer. If the
199 * first id is corrupt, then it will fail on the second dquot in the
200 * buffer so corruptions could point to the wrong dquot in this case.
202 for (i
= 0; i
< ndquots
; i
++) {
203 struct xfs_disk_dquot
*ddq
;
205 ddq
= &dqb
[i
].dd_diskdq
;
208 id
= be32_to_cpu(ddq
->d_id
);
210 fa
= xfs_dqblk_verify(mp
, &dqb
[i
], id
+ i
, 0);
213 xfs_buf_verifier_error(bp
, -EFSCORRUPTED
,
215 sizeof(struct xfs_dqblk
), fa
);
223 static xfs_failaddr_t
224 xfs_dquot_buf_verify_struct(
227 struct xfs_mount
*mp
= bp
->b_target
->bt_mount
;
229 return xfs_dquot_buf_verify(mp
, bp
, false);
233 xfs_dquot_buf_read_verify(
236 struct xfs_mount
*mp
= bp
->b_target
->bt_mount
;
238 if (!xfs_dquot_buf_verify_crc(mp
, bp
, false))
240 xfs_dquot_buf_verify(mp
, bp
, false);
244 * readahead errors are silent and simply leave the buffer as !done so a real
245 * read will then be run with the xfs_dquot_buf_ops verifier. See
246 * xfs_inode_buf_verify() for why we use EIO and ~XBF_DONE here rather than
247 * reporting the failure.
250 xfs_dquot_buf_readahead_verify(
253 struct xfs_mount
*mp
= bp
->b_target
->bt_mount
;
255 if (!xfs_dquot_buf_verify_crc(mp
, bp
, true) ||
256 xfs_dquot_buf_verify(mp
, bp
, true) != NULL
) {
257 xfs_buf_ioerror(bp
, -EIO
);
258 bp
->b_flags
&= ~XBF_DONE
;
263 * we don't calculate the CRC here as that is done when the dquot is flushed to
264 * the buffer after the update is done. This ensures that the dquot in the
265 * buffer always has an up-to-date CRC value.
268 xfs_dquot_buf_write_verify(
271 struct xfs_mount
*mp
= bp
->b_target
->bt_mount
;
273 xfs_dquot_buf_verify(mp
, bp
, false);
276 const struct xfs_buf_ops xfs_dquot_buf_ops
= {
278 .verify_read
= xfs_dquot_buf_read_verify
,
279 .verify_write
= xfs_dquot_buf_write_verify
,
280 .verify_struct
= xfs_dquot_buf_verify_struct
,
283 const struct xfs_buf_ops xfs_dquot_buf_ra_ops
= {
284 .name
= "xfs_dquot_ra",
285 .verify_read
= xfs_dquot_buf_readahead_verify
,
286 .verify_write
= xfs_dquot_buf_write_verify
,