1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Copyright (c) 2000-2006 Silicon Graphics, Inc.
  4 * Copyright (c) 2013 Red Hat, Inc.
  5 * All Rights Reserved.
  6 */
  7#include "xfs.h"
  8#include "xfs_fs.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_quota.h"
 16#include "xfs_trans.h"
 17#include "xfs_qm.h"
 18#include "xfs_error.h"
 19
 20int
 21xfs_calc_dquots_per_chunk(
 22	unsigned int		nbblks)	/* basic block units */
 23{
 24	ASSERT(nbblks > 0);
 25	return BBTOB(nbblks) / sizeof(struct xfs_dqblk);
 26}
 27
 28/*
 29 * Do some primitive error checking on ondisk dquot data structures.
 30 *
 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.
 34 */
 35
 36xfs_failaddr_t
 37xfs_dquot_verify(
 38	struct xfs_mount	*mp,
 39	struct xfs_disk_dquot	*ddq,
 40	xfs_dqid_t		id)	/* used only during quotacheck */
 41{
 42	__u8			ddq_type;
 43
 44	/*
 45	 * We can encounter an uninitialized dquot buffer for 2 reasons:
 46	 * 1. If we crash while deleting the quotainode(s), and those blks got
 47	 *    used for user data. This is because we take the path of regular
 48	 *    file deletion; however, the size field of quotainodes is never
 49	 *    updated, so all the tricks that we play in itruncate_finish
 50	 *    don't quite matter.
 51	 *
 52	 * 2. We don't play the quota buffers when there's a quotaoff logitem.
 53	 *    But the allocation will be replayed so we'll end up with an
 54	 *    uninitialized quota block.
 55	 *
 56	 * This is all fine; things are still consistent, and we haven't lost
 57	 * any quota information. Just don't complain about bad dquot blks.
 58	 */
 59	if (ddq->d_magic != cpu_to_be16(XFS_DQUOT_MAGIC))
 60		return __this_address;
 61	if (ddq->d_version != XFS_DQUOT_VERSION)
 62		return __this_address;
 63
 64	if (ddq->d_type & ~XFS_DQTYPE_ANY)
 65		return __this_address;
 66	ddq_type = ddq->d_type & XFS_DQTYPE_REC_MASK;
 67	if (ddq_type != XFS_DQTYPE_USER &&
 68	    ddq_type != XFS_DQTYPE_PROJ &&
 69	    ddq_type != XFS_DQTYPE_GROUP)
 70		return __this_address;
 71
 72	if ((ddq->d_type & XFS_DQTYPE_BIGTIME) &&
 73	    !xfs_has_bigtime(mp))
 74		return __this_address;
 75
 76	if ((ddq->d_type & XFS_DQTYPE_BIGTIME) && !ddq->d_id)
 77		return __this_address;
 78
 79	if (id != -1 && id != be32_to_cpu(ddq->d_id))
 80		return __this_address;
 81
 82	if (!ddq->d_id)
 83		return NULL;
 84
 85	if (ddq->d_blk_softlimit &&
 86	    be64_to_cpu(ddq->d_bcount) > be64_to_cpu(ddq->d_blk_softlimit) &&
 87	    !ddq->d_btimer)
 88		return __this_address;
 89
 90	if (ddq->d_ino_softlimit &&
 91	    be64_to_cpu(ddq->d_icount) > be64_to_cpu(ddq->d_ino_softlimit) &&
 92	    !ddq->d_itimer)
 93		return __this_address;
 94
 95	if (ddq->d_rtb_softlimit &&
 96	    be64_to_cpu(ddq->d_rtbcount) > be64_to_cpu(ddq->d_rtb_softlimit) &&
 97	    !ddq->d_rtbtimer)
 98		return __this_address;
 99
100	return NULL;
101}
102
103xfs_failaddr_t
104xfs_dqblk_verify(
105	struct xfs_mount	*mp,
106	struct xfs_dqblk	*dqb,
107	xfs_dqid_t		id)	/* used only during quotacheck */
108{
109	if (xfs_has_crc(mp) &&
110	    !uuid_equal(&dqb->dd_uuid, &mp->m_sb.sb_meta_uuid))
111		return __this_address;
112
113	return xfs_dquot_verify(mp, &dqb->dd_diskdq, id);
114}
115
116/*
117 * Do some primitive error checking on ondisk dquot data structures.
118 */
119void
120xfs_dqblk_repair(
121	struct xfs_mount	*mp,
122	struct xfs_dqblk	*dqb,
123	xfs_dqid_t		id,
124	xfs_dqtype_t		type)
125{
126	/*
127	 * Typically, a repair is only requested by quotacheck.
128	 */
129	ASSERT(id != -1);
130	memset(dqb, 0, sizeof(struct xfs_dqblk));
131
132	dqb->dd_diskdq.d_magic = cpu_to_be16(XFS_DQUOT_MAGIC);
133	dqb->dd_diskdq.d_version = XFS_DQUOT_VERSION;
134	dqb->dd_diskdq.d_type = type;
135	dqb->dd_diskdq.d_id = cpu_to_be32(id);
136
137	if (xfs_has_crc(mp)) {
138		uuid_copy(&dqb->dd_uuid, &mp->m_sb.sb_meta_uuid);
139		xfs_update_cksum((char *)dqb, sizeof(struct xfs_dqblk),
140				 XFS_DQUOT_CRC_OFF);
141	}
142}
143
144STATIC bool
145xfs_dquot_buf_verify_crc(
146	struct xfs_mount	*mp,
147	struct xfs_buf		*bp,
148	bool			readahead)
149{
150	struct xfs_dqblk	*d = (struct xfs_dqblk *)bp->b_addr;
151	int			ndquots;
152	int			i;
153
154	if (!xfs_has_crc(mp))
155		return true;
156
157	/*
158	 * if we are in log recovery, the quota subsystem has not been
159	 * initialised so we have no quotainfo structure. In that case, we need
160	 * to manually calculate the number of dquots in the buffer.
161	 */
162	if (mp->m_quotainfo)
163		ndquots = mp->m_quotainfo->qi_dqperchunk;
164	else
165		ndquots = xfs_calc_dquots_per_chunk(bp->b_length);
166
167	for (i = 0; i < ndquots; i++, d++) {
168		if (!xfs_verify_cksum((char *)d, sizeof(struct xfs_dqblk),
169				 XFS_DQUOT_CRC_OFF)) {
170			if (!readahead)
171				xfs_buf_verifier_error(bp, -EFSBADCRC, __func__,
172					d, sizeof(*d), __this_address);
173			return false;
174		}
175	}
176	return true;
177}
178
179STATIC xfs_failaddr_t
180xfs_dquot_buf_verify(
181	struct xfs_mount	*mp,
182	struct xfs_buf		*bp,
183	bool			readahead)
184{
185	struct xfs_dqblk	*dqb = bp->b_addr;
186	xfs_failaddr_t		fa;
187	xfs_dqid_t		id = 0;
188	int			ndquots;
189	int			i;
190
191	/*
192	 * if we are in log recovery, the quota subsystem has not been
193	 * initialised so we have no quotainfo structure. In that case, we need
194	 * to manually calculate the number of dquots in the buffer.
195	 */
196	if (mp->m_quotainfo)
197		ndquots = mp->m_quotainfo->qi_dqperchunk;
198	else
199		ndquots = xfs_calc_dquots_per_chunk(bp->b_length);
200
201	/*
202	 * On the first read of the buffer, verify that each dquot is valid.
203	 * We don't know what the id of the dquot is supposed to be, just that
204	 * they should be increasing monotonically within the buffer. If the
205	 * first id is corrupt, then it will fail on the second dquot in the
206	 * buffer so corruptions could point to the wrong dquot in this case.
207	 */
208	for (i = 0; i < ndquots; i++) {
209		struct xfs_disk_dquot	*ddq;
210
211		ddq = &dqb[i].dd_diskdq;
212
213		if (i == 0)
214			id = be32_to_cpu(ddq->d_id);
215
216		fa = xfs_dqblk_verify(mp, &dqb[i], id + i);
217		if (fa) {
218			if (!readahead)
219				xfs_buf_verifier_error(bp, -EFSCORRUPTED,
220					__func__, &dqb[i],
221					sizeof(struct xfs_dqblk), fa);
222			return fa;
223		}
224	}
225
226	return NULL;
227}
228
229static xfs_failaddr_t
230xfs_dquot_buf_verify_struct(
231	struct xfs_buf		*bp)
232{
233	struct xfs_mount	*mp = bp->b_mount;
234
235	return xfs_dquot_buf_verify(mp, bp, false);
236}
237
238static void
239xfs_dquot_buf_read_verify(
240	struct xfs_buf		*bp)
241{
242	struct xfs_mount	*mp = bp->b_mount;
243
244	if (!xfs_dquot_buf_verify_crc(mp, bp, false))
245		return;
246	xfs_dquot_buf_verify(mp, bp, false);
247}
248
249/*
250 * readahead errors are silent and simply leave the buffer as !done so a real
251 * read will then be run with the xfs_dquot_buf_ops verifier. See
252 * xfs_inode_buf_verify() for why we use EIO and ~XBF_DONE here rather than
253 * reporting the failure.
254 */
255static void
256xfs_dquot_buf_readahead_verify(
257	struct xfs_buf	*bp)
258{
259	struct xfs_mount	*mp = bp->b_mount;
260
261	if (!xfs_dquot_buf_verify_crc(mp, bp, true) ||
262	    xfs_dquot_buf_verify(mp, bp, true) != NULL) {
263		xfs_buf_ioerror(bp, -EIO);
264		bp->b_flags &= ~XBF_DONE;
265	}
266}
267
268/*
269 * we don't calculate the CRC here as that is done when the dquot is flushed to
270 * the buffer after the update is done. This ensures that the dquot in the
271 * buffer always has an up-to-date CRC value.
272 */
273static void
274xfs_dquot_buf_write_verify(
275	struct xfs_buf		*bp)
276{
277	struct xfs_mount	*mp = bp->b_mount;
278
279	xfs_dquot_buf_verify(mp, bp, false);
280}
281
282const struct xfs_buf_ops xfs_dquot_buf_ops = {
283	.name = "xfs_dquot",
284	.magic16 = { cpu_to_be16(XFS_DQUOT_MAGIC),
285		     cpu_to_be16(XFS_DQUOT_MAGIC) },
286	.verify_read = xfs_dquot_buf_read_verify,
287	.verify_write = xfs_dquot_buf_write_verify,
288	.verify_struct = xfs_dquot_buf_verify_struct,
289};
290
291const struct xfs_buf_ops xfs_dquot_buf_ra_ops = {
292	.name = "xfs_dquot_ra",
293	.magic16 = { cpu_to_be16(XFS_DQUOT_MAGIC),
294		     cpu_to_be16(XFS_DQUOT_MAGIC) },
295	.verify_read = xfs_dquot_buf_readahead_verify,
296	.verify_write = xfs_dquot_buf_write_verify,
297};
298
299/* Convert an on-disk timer value into an incore timer value. */
300time64_t
301xfs_dquot_from_disk_ts(
302	struct xfs_disk_dquot	*ddq,
303	__be32			dtimer)
304{
305	uint32_t		t = be32_to_cpu(dtimer);
306
307	if (t != 0 && (ddq->d_type & XFS_DQTYPE_BIGTIME))
308		return xfs_dq_bigtime_to_unix(t);
309
310	return t;
311}
312
313/* Convert an incore timer value into an on-disk timer value. */
314__be32
315xfs_dquot_to_disk_ts(
316	struct xfs_dquot	*dqp,
317	time64_t		timer)
318{
319	uint32_t		t = timer;
320
321	if (timer != 0 && (dqp->q_type & XFS_DQTYPE_BIGTIME))
322		t = xfs_dq_unix_to_bigtime(timer);
323
324	return cpu_to_be32(t);
325}