1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (c) 2000-2003 Silicon Graphics, Inc.
4 * All Rights Reserved.
5 */
6 #include "xfs.h"
7 #include "xfs_fs.h"
8 #include "xfs_shared.h"
9 #include "xfs_format.h"
10 #include "xfs_log_format.h"
11 #include "xfs_trans_resv.h"
12 #include "xfs_mount.h"
13 #include "xfs_inode.h"
14 #include "xfs_quota.h"
15 #include "xfs_trans.h"
16 #include "xfs_buf_item.h"
17 #include "xfs_trans_priv.h"
18 #include "xfs_qm.h"
19 #include "xfs_log.h"
20 #include "xfs_error.h"
21
22 static inline struct xfs_dq_logitem *DQUOT_ITEM(struct xfs_log_item *lip)
23 {
24 return container_of(lip, struct xfs_dq_logitem, qli_item);
25 }
26
27 /*
28 * returns the number of iovecs needed to log the given dquot item.
29 */
30 STATIC void
31 xfs_qm_dquot_logitem_size(
32 struct xfs_log_item *lip,
33 int *nvecs,
34 int *nbytes)
35 {
36 *nvecs += 2;
37 *nbytes += sizeof(struct xfs_dq_logformat) +
38 sizeof(struct xfs_disk_dquot);
39 }
40
41 /*
42 * fills in the vector of log iovecs for the given dquot log item.
43 */
44 STATIC void
45 xfs_qm_dquot_logitem_format(
46 struct xfs_log_item *lip,
47 struct xfs_log_vec *lv)
48 {
49 struct xfs_disk_dquot ddq;
50 struct xfs_dq_logitem *qlip = DQUOT_ITEM(lip);
51 struct xfs_log_iovec *vecp = NULL;
52 struct xfs_dq_logformat *qlf;
53
54 qlf = xlog_prepare_iovec(lv, &vecp, XLOG_REG_TYPE_QFORMAT);
55 qlf->qlf_type = XFS_LI_DQUOT;
56 qlf->qlf_size = 2;
57 qlf->qlf_id = qlip->qli_dquot->q_id;
58 qlf->qlf_blkno = qlip->qli_dquot->q_blkno;
59 qlf->qlf_len = 1;
60 qlf->qlf_boffset = qlip->qli_dquot->q_bufoffset;
61 xlog_finish_iovec(lv, vecp, sizeof(struct xfs_dq_logformat));
62
63 xfs_dquot_to_disk(&ddq, qlip->qli_dquot);
64
65 xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_DQUOT, &ddq,
66 sizeof(struct xfs_disk_dquot));
67 }
68
69 /*
70 * Increment the pin count of the given dquot.
71 */
72 STATIC void
73 xfs_qm_dquot_logitem_pin(
74 struct xfs_log_item *lip)
75 {
76 struct xfs_dquot *dqp = DQUOT_ITEM(lip)->qli_dquot;
77
78 ASSERT(XFS_DQ_IS_LOCKED(dqp));
79 atomic_inc(&dqp->q_pincount);
80 }
81
82 /*
83 * Decrement the pin count of the given dquot, and wake up
84 * anyone in xfs_dqwait_unpin() if the count goes to 0. The
85 * dquot must have been previously pinned with a call to
86 * xfs_qm_dquot_logitem_pin().
87 */
88 STATIC void
89 xfs_qm_dquot_logitem_unpin(
90 struct xfs_log_item *lip,
91 int remove)
92 {
93 struct xfs_dquot *dqp = DQUOT_ITEM(lip)->qli_dquot;
94
95 ASSERT(atomic_read(&dqp->q_pincount) > 0);
96 if (atomic_dec_and_test(&dqp->q_pincount))
97 wake_up(&dqp->q_pinwait);
98 }
99
100 /*
101 * This is called to wait for the given dquot to be unpinned.
102 * Most of these pin/unpin routines are plagiarized from inode code.
103 */
104 void
105 xfs_qm_dqunpin_wait(
106 struct xfs_dquot *dqp)
107 {
108 ASSERT(XFS_DQ_IS_LOCKED(dqp));
109 if (atomic_read(&dqp->q_pincount) == 0)
110 return;
111
112 /*
113 * Give the log a push so we don't wait here too long.
114 */
115 xfs_log_force(dqp->q_mount, 0);
116 wait_event(dqp->q_pinwait, (atomic_read(&dqp->q_pincount) == 0));
117 }
118
119 STATIC uint
120 xfs_qm_dquot_logitem_push(
121 struct xfs_log_item *lip,
122 struct list_head *buffer_list)
123 __releases(&lip->li_ailp->ail_lock)
124 __acquires(&lip->li_ailp->ail_lock)
125 {
126 struct xfs_dquot *dqp = DQUOT_ITEM(lip)->qli_dquot;
127 struct xfs_buf *bp = lip->li_buf;
128 uint rval = XFS_ITEM_SUCCESS;
129 int error;
130
131 if (atomic_read(&dqp->q_pincount) > 0)
132 return XFS_ITEM_PINNED;
133
134 if (!xfs_dqlock_nowait(dqp))
135 return XFS_ITEM_LOCKED;
136
137 /*
138 * Re-check the pincount now that we stabilized the value by
139 * taking the quota lock.
140 */
141 if (atomic_read(&dqp->q_pincount) > 0) {
142 rval = XFS_ITEM_PINNED;
143 goto out_unlock;
144 }
145
146 /*
147 * Someone else is already flushing the dquot. Nothing we can do
148 * here but wait for the flush to finish and remove the item from
149 * the AIL.
150 */
151 if (!xfs_dqflock_nowait(dqp)) {
152 rval = XFS_ITEM_FLUSHING;
153 goto out_unlock;
154 }
155
156 spin_unlock(&lip->li_ailp->ail_lock);
157
158 error = xfs_qm_dqflush(dqp, &bp);
159 if (!error) {
160 if (!xfs_buf_delwri_queue(bp, buffer_list))
161 rval = XFS_ITEM_FLUSHING;
162 xfs_buf_relse(bp);
163 } else if (error == -EAGAIN)
164 rval = XFS_ITEM_LOCKED;
165
166 spin_lock(&lip->li_ailp->ail_lock);
167 out_unlock:
168 xfs_dqunlock(dqp);
169 return rval;
170 }
171
172 STATIC void
173 xfs_qm_dquot_logitem_release(
174 struct xfs_log_item *lip)
175 {
176 struct xfs_dquot *dqp = DQUOT_ITEM(lip)->qli_dquot;
177
178 ASSERT(XFS_DQ_IS_LOCKED(dqp));
179
180 /*
181 * dquots are never 'held' from getting unlocked at the end of
182 * a transaction. Their locking and unlocking is hidden inside the
183 * transaction layer, within trans_commit. Hence, no LI_HOLD flag
184 * for the logitem.
185 */
186 xfs_dqunlock(dqp);
187 }
188
189 STATIC void
190 xfs_qm_dquot_logitem_committing(
191 struct xfs_log_item *lip,
192 xfs_csn_t seq)
193 {
194 return xfs_qm_dquot_logitem_release(lip);
195 }
196
197 #ifdef DEBUG_EXPENSIVE
198 static int
199 xfs_qm_dquot_logitem_precommit(
200 struct xfs_trans *tp,
201 struct xfs_log_item *lip)
202 {
203 struct xfs_dquot *dqp = DQUOT_ITEM(lip)->qli_dquot;
204 struct xfs_mount *mp = dqp->q_mount;
205 struct xfs_disk_dquot ddq = { };
206 xfs_failaddr_t fa;
207
208 xfs_dquot_to_disk(&ddq, dqp);
209 fa = xfs_dquot_verify(mp, &ddq, dqp->q_id);
210 if (fa) {
211 XFS_CORRUPTION_ERROR("Bad dquot during logging",
212 XFS_ERRLEVEL_LOW, mp, &ddq, sizeof(ddq));
213 xfs_alert(mp,
214 "Metadata corruption detected at %pS, dquot 0x%x",
215 fa, dqp->q_id);
216 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
217 ASSERT(fa == NULL);
218 }
219
220 return 0;
221 }
222 #else
223 # define xfs_qm_dquot_logitem_precommit NULL
224 #endif
225
226 static const struct xfs_item_ops xfs_dquot_item_ops = {
227 .iop_size = xfs_qm_dquot_logitem_size,
228 .iop_precommit = xfs_qm_dquot_logitem_precommit,
229 .iop_format = xfs_qm_dquot_logitem_format,
230 .iop_pin = xfs_qm_dquot_logitem_pin,
231 .iop_unpin = xfs_qm_dquot_logitem_unpin,
232 .iop_release = xfs_qm_dquot_logitem_release,
233 .iop_committing = xfs_qm_dquot_logitem_committing,
234 .iop_push = xfs_qm_dquot_logitem_push,
235 };
236
237 /*
238 * Initialize the dquot log item for a newly allocated dquot.
239 * The dquot isn't locked at this point, but it isn't on any of the lists
240 * either, so we don't care.
241 */
242 void
243 xfs_qm_dquot_logitem_init(
244 struct xfs_dquot *dqp)
245 {
246 struct xfs_dq_logitem *lp = &dqp->q_logitem;
247
248 xfs_log_item_init(dqp->q_mount, &lp->qli_item, XFS_LI_DQUOT,
249 &xfs_dquot_item_ops);
250 lp->qli_dquot = dqp;
251 }
252
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