1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (c) 2000-2006 Silicon Graphics, Inc.
4 * Copyright (c) 2013 Red Hat, Inc.
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_quota.h"
16 #include "xfs_trans.h"
18 #include "xfs_error.h"
19 #include "xfs_cksum.h"
20 #include "xfs_trace.h"
23 xfs_calc_dquots_per_chunk(
24 unsigned int nbblks) /* basic block units */
27 return BBTOB(nbblks) / sizeof(xfs_dqblk_t);
31 * Do some primitive error checking on ondisk dquot data structures.
33 * The xfs_dqblk structure /contains/ the xfs_disk_dquot structure;
34 * we verify them separately because at some points we have only the
35 * smaller xfs_disk_dquot structure available.
41 xfs_disk_dquot_t *ddq,
43 uint type) /* used only during quotacheck */
46 * We can encounter an uninitialized dquot buffer for 2 reasons:
47 * 1. If we crash while deleting the quotainode(s), and those blks got
48 * used for user data. This is because we take the path of regular
49 * file deletion; however, the size field of quotainodes is never
50 * updated, so all the tricks that we play in itruncate_finish
53 * 2. We don't play the quota buffers when there's a quotaoff logitem.
54 * But the allocation will be replayed so we'll end up with an
55 * uninitialized quota block.
57 * This is all fine; things are still consistent, and we haven't lost
58 * any quota information. Just don't complain about bad dquot blks.
60 if (ddq->d_magic != cpu_to_be16(XFS_DQUOT_MAGIC))
61 return __this_address;
62 if (ddq->d_version != XFS_DQUOT_VERSION)
63 return __this_address;
65 if (type && ddq->d_flags != type)
66 return __this_address;
67 if (ddq->d_flags != XFS_DQ_USER &&
68 ddq->d_flags != XFS_DQ_PROJ &&
69 ddq->d_flags != XFS_DQ_GROUP)
70 return __this_address;
72 if (id != -1 && id != be32_to_cpu(ddq->d_id))
73 return __this_address;
78 if (ddq->d_blk_softlimit &&
79 be64_to_cpu(ddq->d_bcount) > be64_to_cpu(ddq->d_blk_softlimit) &&
81 return __this_address;
83 if (ddq->d_ino_softlimit &&
84 be64_to_cpu(ddq->d_icount) > be64_to_cpu(ddq->d_ino_softlimit) &&
86 return __this_address;
88 if (ddq->d_rtb_softlimit &&
89 be64_to_cpu(ddq->d_rtbcount) > be64_to_cpu(ddq->d_rtb_softlimit) &&
91 return __this_address;
99 struct xfs_dqblk *dqb,
101 uint type) /* used only during quotacheck */
103 if (xfs_sb_version_hascrc(&mp->m_sb) &&
104 !uuid_equal(&dqb->dd_uuid, &mp->m_sb.sb_meta_uuid))
105 return __this_address;
107 return xfs_dquot_verify(mp, &dqb->dd_diskdq, id, type);
111 * Do some primitive error checking on ondisk dquot data structures.
115 struct xfs_mount *mp,
116 struct xfs_dqblk *dqb,
121 * Typically, a repair is only requested by quotacheck.
124 memset(dqb, 0, sizeof(xfs_dqblk_t));
126 dqb->dd_diskdq.d_magic = cpu_to_be16(XFS_DQUOT_MAGIC);
127 dqb->dd_diskdq.d_version = XFS_DQUOT_VERSION;
128 dqb->dd_diskdq.d_flags = type;
129 dqb->dd_diskdq.d_id = cpu_to_be32(id);
131 if (xfs_sb_version_hascrc(&mp->m_sb)) {
132 uuid_copy(&dqb->dd_uuid, &mp->m_sb.sb_meta_uuid);
133 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_mount;
229 return xfs_dquot_buf_verify(mp, bp, false);
233 xfs_dquot_buf_read_verify(
236 struct xfs_mount *mp = bp->b_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_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_mount;
273 xfs_dquot_buf_verify(mp, bp, false);
276 const struct xfs_buf_ops xfs_dquot_buf_ops = {
278 .magic16 = { cpu_to_be16(XFS_DQUOT_MAGIC),
279 cpu_to_be16(XFS_DQUOT_MAGIC) },
280 .verify_read = xfs_dquot_buf_read_verify,
281 .verify_write = xfs_dquot_buf_write_verify,
282 .verify_struct = xfs_dquot_buf_verify_struct,
285 const struct xfs_buf_ops xfs_dquot_buf_ra_ops = {
286 .name = "xfs_dquot_ra",
287 .magic16 = { cpu_to_be16(XFS_DQUOT_MAGIC),
288 cpu_to_be16(XFS_DQUOT_MAGIC) },
289 .verify_read = xfs_dquot_buf_readahead_verify,
290 .verify_write = xfs_dquot_buf_write_verify,