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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
21static inline struct xfs_dq_logitem *DQUOT_ITEM(struct xfs_log_item *lip)
22{
23 return container_of(lip, struct xfs_dq_logitem, qli_item);
24}
25
26/*
27 * returns the number of iovecs needed to log the given dquot item.
28 */
29STATIC void
30xfs_qm_dquot_logitem_size(
31 struct xfs_log_item *lip,
32 int *nvecs,
33 int *nbytes)
34{
35 *nvecs += 2;
36 *nbytes += sizeof(struct xfs_dq_logformat) +
37 sizeof(struct xfs_disk_dquot);
38}
39
40/*
41 * fills in the vector of log iovecs for the given dquot log item.
42 */
43STATIC void
44xfs_qm_dquot_logitem_format(
45 struct xfs_log_item *lip,
46 struct xfs_log_vec *lv)
47{
48 struct xfs_disk_dquot ddq;
49 struct xfs_dq_logitem *qlip = DQUOT_ITEM(lip);
50 struct xfs_log_iovec *vecp = NULL;
51 struct xfs_dq_logformat *qlf;
52
53 qlf = xlog_prepare_iovec(lv, &vecp, XLOG_REG_TYPE_QFORMAT);
54 qlf->qlf_type = XFS_LI_DQUOT;
55 qlf->qlf_size = 2;
56 qlf->qlf_id = qlip->qli_dquot->q_id;
57 qlf->qlf_blkno = qlip->qli_dquot->q_blkno;
58 qlf->qlf_len = 1;
59 qlf->qlf_boffset = qlip->qli_dquot->q_bufoffset;
60 xlog_finish_iovec(lv, vecp, sizeof(struct xfs_dq_logformat));
61
62 xfs_dquot_to_disk(&ddq, qlip->qli_dquot);
63
64 xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_DQUOT, &ddq,
65 sizeof(struct xfs_disk_dquot));
66}
67
68/*
69 * Increment the pin count of the given dquot.
70 */
71STATIC void
72xfs_qm_dquot_logitem_pin(
73 struct xfs_log_item *lip)
74{
75 struct xfs_dquot *dqp = DQUOT_ITEM(lip)->qli_dquot;
76
77 ASSERT(XFS_DQ_IS_LOCKED(dqp));
78 atomic_inc(&dqp->q_pincount);
79}
80
81/*
82 * Decrement the pin count of the given dquot, and wake up
83 * anyone in xfs_dqwait_unpin() if the count goes to 0. The
84 * dquot must have been previously pinned with a call to
85 * xfs_qm_dquot_logitem_pin().
86 */
87STATIC void
88xfs_qm_dquot_logitem_unpin(
89 struct xfs_log_item *lip,
90 int remove)
91{
92 struct xfs_dquot *dqp = DQUOT_ITEM(lip)->qli_dquot;
93
94 ASSERT(atomic_read(&dqp->q_pincount) > 0);
95 if (atomic_dec_and_test(&dqp->q_pincount))
96 wake_up(&dqp->q_pinwait);
97}
98
99/*
100 * This is called to wait for the given dquot to be unpinned.
101 * Most of these pin/unpin routines are plagiarized from inode code.
102 */
103void
104xfs_qm_dqunpin_wait(
105 struct xfs_dquot *dqp)
106{
107 ASSERT(XFS_DQ_IS_LOCKED(dqp));
108 if (atomic_read(&dqp->q_pincount) == 0)
109 return;
110
111 /*
112 * Give the log a push so we don't wait here too long.
113 */
114 xfs_log_force(dqp->q_mount, 0);
115 wait_event(dqp->q_pinwait, (atomic_read(&dqp->q_pincount) == 0));
116}
117
118STATIC uint
119xfs_qm_dquot_logitem_push(
120 struct xfs_log_item *lip,
121 struct list_head *buffer_list)
122 __releases(&lip->li_ailp->ail_lock)
123 __acquires(&lip->li_ailp->ail_lock)
124{
125 struct xfs_dquot *dqp = DQUOT_ITEM(lip)->qli_dquot;
126 struct xfs_buf *bp = lip->li_buf;
127 uint rval = XFS_ITEM_SUCCESS;
128 int error;
129
130 if (atomic_read(&dqp->q_pincount) > 0)
131 return XFS_ITEM_PINNED;
132
133 if (!xfs_dqlock_nowait(dqp))
134 return XFS_ITEM_LOCKED;
135
136 /*
137 * Re-check the pincount now that we stabilized the value by
138 * taking the quota lock.
139 */
140 if (atomic_read(&dqp->q_pincount) > 0) {
141 rval = XFS_ITEM_PINNED;
142 goto out_unlock;
143 }
144
145 /*
146 * Someone else is already flushing the dquot. Nothing we can do
147 * here but wait for the flush to finish and remove the item from
148 * the AIL.
149 */
150 if (!xfs_dqflock_nowait(dqp)) {
151 rval = XFS_ITEM_FLUSHING;
152 goto out_unlock;
153 }
154
155 spin_unlock(&lip->li_ailp->ail_lock);
156
157 error = xfs_qm_dqflush(dqp, &bp);
158 if (!error) {
159 if (!xfs_buf_delwri_queue(bp, buffer_list))
160 rval = XFS_ITEM_FLUSHING;
161 xfs_buf_relse(bp);
162 } else if (error == -EAGAIN)
163 rval = XFS_ITEM_LOCKED;
164
165 spin_lock(&lip->li_ailp->ail_lock);
166out_unlock:
167 xfs_dqunlock(dqp);
168 return rval;
169}
170
171STATIC void
172xfs_qm_dquot_logitem_release(
173 struct xfs_log_item *lip)
174{
175 struct xfs_dquot *dqp = DQUOT_ITEM(lip)->qli_dquot;
176
177 ASSERT(XFS_DQ_IS_LOCKED(dqp));
178
179 /*
180 * dquots are never 'held' from getting unlocked at the end of
181 * a transaction. Their locking and unlocking is hidden inside the
182 * transaction layer, within trans_commit. Hence, no LI_HOLD flag
183 * for the logitem.
184 */
185 xfs_dqunlock(dqp);
186}
187
188STATIC void
189xfs_qm_dquot_logitem_committing(
190 struct xfs_log_item *lip,
191 xfs_csn_t seq)
192{
193 return xfs_qm_dquot_logitem_release(lip);
194}
195
196static const struct xfs_item_ops xfs_dquot_item_ops = {
197 .iop_size = xfs_qm_dquot_logitem_size,
198 .iop_format = xfs_qm_dquot_logitem_format,
199 .iop_pin = xfs_qm_dquot_logitem_pin,
200 .iop_unpin = xfs_qm_dquot_logitem_unpin,
201 .iop_release = xfs_qm_dquot_logitem_release,
202 .iop_committing = xfs_qm_dquot_logitem_committing,
203 .iop_push = xfs_qm_dquot_logitem_push,
204};
205
206/*
207 * Initialize the dquot log item for a newly allocated dquot.
208 * The dquot isn't locked at this point, but it isn't on any of the lists
209 * either, so we don't care.
210 */
211void
212xfs_qm_dquot_logitem_init(
213 struct xfs_dquot *dqp)
214{
215 struct xfs_dq_logitem *lp = &dqp->q_logitem;
216
217 xfs_log_item_init(dqp->q_mount, &lp->qli_item, XFS_LI_DQUOT,
218 &xfs_dquot_item_ops);
219 lp->qli_dquot = dqp;
220}
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
22static 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 */
30STATIC void
31xfs_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 */
44STATIC void
45xfs_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 */
72STATIC void
73xfs_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 */
88STATIC void
89xfs_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 */
104void
105xfs_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
119STATIC uint
120xfs_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_dq_logitem *qlip = DQUOT_ITEM(lip);
127 struct xfs_dquot *dqp = qlip->qli_dquot;
128 struct xfs_buf *bp;
129 uint rval = XFS_ITEM_SUCCESS;
130 int error;
131
132 if (atomic_read(&dqp->q_pincount) > 0)
133 return XFS_ITEM_PINNED;
134
135 if (!xfs_dqlock_nowait(dqp))
136 return XFS_ITEM_LOCKED;
137
138 /*
139 * Re-check the pincount now that we stabilized the value by
140 * taking the quota lock.
141 */
142 if (atomic_read(&dqp->q_pincount) > 0) {
143 rval = XFS_ITEM_PINNED;
144 goto out_unlock;
145 }
146
147 /*
148 * Someone else is already flushing the dquot. Nothing we can do
149 * here but wait for the flush to finish and remove the item from
150 * the AIL.
151 */
152 if (!xfs_dqflock_nowait(dqp)) {
153 rval = XFS_ITEM_FLUSHING;
154 goto out_unlock;
155 }
156
157 spin_unlock(&lip->li_ailp->ail_lock);
158
159 error = xfs_dquot_use_attached_buf(dqp, &bp);
160 if (error == -EAGAIN) {
161 xfs_dqfunlock(dqp);
162 rval = XFS_ITEM_LOCKED;
163 goto out_relock_ail;
164 }
165
166 /*
167 * dqflush completes dqflock on error, and the delwri ioend does it on
168 * success.
169 */
170 error = xfs_qm_dqflush(dqp, bp);
171 if (!error) {
172 if (!xfs_buf_delwri_queue(bp, buffer_list))
173 rval = XFS_ITEM_FLUSHING;
174 }
175 xfs_buf_relse(bp);
176
177out_relock_ail:
178 spin_lock(&lip->li_ailp->ail_lock);
179out_unlock:
180 xfs_dqunlock(dqp);
181 return rval;
182}
183
184STATIC void
185xfs_qm_dquot_logitem_release(
186 struct xfs_log_item *lip)
187{
188 struct xfs_dquot *dqp = DQUOT_ITEM(lip)->qli_dquot;
189
190 ASSERT(XFS_DQ_IS_LOCKED(dqp));
191
192 /*
193 * dquots are never 'held' from getting unlocked at the end of
194 * a transaction. Their locking and unlocking is hidden inside the
195 * transaction layer, within trans_commit. Hence, no LI_HOLD flag
196 * for the logitem.
197 */
198 xfs_dqunlock(dqp);
199}
200
201STATIC void
202xfs_qm_dquot_logitem_committing(
203 struct xfs_log_item *lip,
204 xfs_csn_t seq)
205{
206 return xfs_qm_dquot_logitem_release(lip);
207}
208
209#ifdef DEBUG_EXPENSIVE
210static void
211xfs_qm_dquot_logitem_precommit_check(
212 struct xfs_dquot *dqp)
213{
214 struct xfs_mount *mp = dqp->q_mount;
215 struct xfs_disk_dquot ddq = { };
216 xfs_failaddr_t fa;
217
218 xfs_dquot_to_disk(&ddq, dqp);
219 fa = xfs_dquot_verify(mp, &ddq, dqp->q_id);
220 if (fa) {
221 XFS_CORRUPTION_ERROR("Bad dquot during logging",
222 XFS_ERRLEVEL_LOW, mp, &ddq, sizeof(ddq));
223 xfs_alert(mp,
224 "Metadata corruption detected at %pS, dquot 0x%x",
225 fa, dqp->q_id);
226 xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
227 ASSERT(fa == NULL);
228 }
229}
230#else
231# define xfs_qm_dquot_logitem_precommit_check(...) ((void)0)
232#endif
233
234static int
235xfs_qm_dquot_logitem_precommit(
236 struct xfs_trans *tp,
237 struct xfs_log_item *lip)
238{
239 struct xfs_dq_logitem *qlip = DQUOT_ITEM(lip);
240 struct xfs_dquot *dqp = qlip->qli_dquot;
241
242 xfs_qm_dquot_logitem_precommit_check(dqp);
243
244 return xfs_dquot_attach_buf(tp, dqp);
245}
246
247static const struct xfs_item_ops xfs_dquot_item_ops = {
248 .iop_size = xfs_qm_dquot_logitem_size,
249 .iop_precommit = xfs_qm_dquot_logitem_precommit,
250 .iop_format = xfs_qm_dquot_logitem_format,
251 .iop_pin = xfs_qm_dquot_logitem_pin,
252 .iop_unpin = xfs_qm_dquot_logitem_unpin,
253 .iop_release = xfs_qm_dquot_logitem_release,
254 .iop_committing = xfs_qm_dquot_logitem_committing,
255 .iop_push = xfs_qm_dquot_logitem_push,
256};
257
258/*
259 * Initialize the dquot log item for a newly allocated dquot.
260 * The dquot isn't locked at this point, but it isn't on any of the lists
261 * either, so we don't care.
262 */
263void
264xfs_qm_dquot_logitem_init(
265 struct xfs_dquot *dqp)
266{
267 struct xfs_dq_logitem *lp = &dqp->q_logitem;
268
269 xfs_log_item_init(dqp->q_mount, &lp->qli_item, XFS_LI_DQUOT,
270 &xfs_dquot_item_ops);
271 spin_lock_init(&lp->qli_lock);
272 lp->qli_dquot = dqp;
273 lp->qli_dirty = false;
274}