xref: /openbmc/linux/fs/xfs/xfs_dquot_item.c (revision a13f2ef1)
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 
21 static 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  */
29 STATIC void
30 xfs_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  */
43 STATIC void
44 xfs_qm_dquot_logitem_format(
45 	struct xfs_log_item	*lip,
46 	struct xfs_log_vec	*lv)
47 {
48 	struct xfs_dq_logitem	*qlip = DQUOT_ITEM(lip);
49 	struct xfs_log_iovec	*vecp = NULL;
50 	struct xfs_dq_logformat	*qlf;
51 
52 	qlf = xlog_prepare_iovec(lv, &vecp, XLOG_REG_TYPE_QFORMAT);
53 	qlf->qlf_type = XFS_LI_DQUOT;
54 	qlf->qlf_size = 2;
55 	qlf->qlf_id = be32_to_cpu(qlip->qli_dquot->q_core.d_id);
56 	qlf->qlf_blkno = qlip->qli_dquot->q_blkno;
57 	qlf->qlf_len = 1;
58 	qlf->qlf_boffset = qlip->qli_dquot->q_bufoffset;
59 	xlog_finish_iovec(lv, vecp, sizeof(struct xfs_dq_logformat));
60 
61 	xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_DQUOT,
62 			&qlip->qli_dquot->q_core,
63 			sizeof(struct xfs_disk_dquot));
64 }
65 
66 /*
67  * Increment the pin count of the given dquot.
68  */
69 STATIC void
70 xfs_qm_dquot_logitem_pin(
71 	struct xfs_log_item	*lip)
72 {
73 	struct xfs_dquot	*dqp = DQUOT_ITEM(lip)->qli_dquot;
74 
75 	ASSERT(XFS_DQ_IS_LOCKED(dqp));
76 	atomic_inc(&dqp->q_pincount);
77 }
78 
79 /*
80  * Decrement the pin count of the given dquot, and wake up
81  * anyone in xfs_dqwait_unpin() if the count goes to 0.	 The
82  * dquot must have been previously pinned with a call to
83  * xfs_qm_dquot_logitem_pin().
84  */
85 STATIC void
86 xfs_qm_dquot_logitem_unpin(
87 	struct xfs_log_item	*lip,
88 	int			remove)
89 {
90 	struct xfs_dquot	*dqp = DQUOT_ITEM(lip)->qli_dquot;
91 
92 	ASSERT(atomic_read(&dqp->q_pincount) > 0);
93 	if (atomic_dec_and_test(&dqp->q_pincount))
94 		wake_up(&dqp->q_pinwait);
95 }
96 
97 /*
98  * This is called to wait for the given dquot to be unpinned.
99  * Most of these pin/unpin routines are plagiarized from inode code.
100  */
101 void
102 xfs_qm_dqunpin_wait(
103 	struct xfs_dquot	*dqp)
104 {
105 	ASSERT(XFS_DQ_IS_LOCKED(dqp));
106 	if (atomic_read(&dqp->q_pincount) == 0)
107 		return;
108 
109 	/*
110 	 * Give the log a push so we don't wait here too long.
111 	 */
112 	xfs_log_force(dqp->q_mount, 0);
113 	wait_event(dqp->q_pinwait, (atomic_read(&dqp->q_pincount) == 0));
114 }
115 
116 /*
117  * Callback used to mark a buffer with XFS_LI_FAILED when items in the buffer
118  * have been failed during writeback
119  *
120  * this informs the AIL that the dquot is already flush locked on the next push,
121  * and acquires a hold on the buffer to ensure that it isn't reclaimed before
122  * dirty data makes it to disk.
123  */
124 STATIC void
125 xfs_dquot_item_error(
126 	struct xfs_log_item	*lip,
127 	struct xfs_buf		*bp)
128 {
129 	ASSERT(!completion_done(&DQUOT_ITEM(lip)->qli_dquot->q_flush));
130 	xfs_set_li_failed(lip, bp);
131 }
132 
133 STATIC uint
134 xfs_qm_dquot_logitem_push(
135 	struct xfs_log_item	*lip,
136 	struct list_head	*buffer_list)
137 		__releases(&lip->li_ailp->ail_lock)
138 		__acquires(&lip->li_ailp->ail_lock)
139 {
140 	struct xfs_dquot	*dqp = DQUOT_ITEM(lip)->qli_dquot;
141 	struct xfs_buf		*bp = lip->li_buf;
142 	uint			rval = XFS_ITEM_SUCCESS;
143 	int			error;
144 
145 	if (atomic_read(&dqp->q_pincount) > 0)
146 		return XFS_ITEM_PINNED;
147 
148 	if (!xfs_dqlock_nowait(dqp))
149 		return XFS_ITEM_LOCKED;
150 
151 	/*
152 	 * Re-check the pincount now that we stabilized the value by
153 	 * taking the quota lock.
154 	 */
155 	if (atomic_read(&dqp->q_pincount) > 0) {
156 		rval = XFS_ITEM_PINNED;
157 		goto out_unlock;
158 	}
159 
160 	/*
161 	 * Someone else is already flushing the dquot.  Nothing we can do
162 	 * here but wait for the flush to finish and remove the item from
163 	 * the AIL.
164 	 */
165 	if (!xfs_dqflock_nowait(dqp)) {
166 		rval = XFS_ITEM_FLUSHING;
167 		goto out_unlock;
168 	}
169 
170 	spin_unlock(&lip->li_ailp->ail_lock);
171 
172 	error = xfs_qm_dqflush(dqp, &bp);
173 	if (!error) {
174 		if (!xfs_buf_delwri_queue(bp, buffer_list))
175 			rval = XFS_ITEM_FLUSHING;
176 		xfs_buf_relse(bp);
177 	} else if (error == -EAGAIN)
178 		rval = XFS_ITEM_LOCKED;
179 
180 	spin_lock(&lip->li_ailp->ail_lock);
181 out_unlock:
182 	xfs_dqunlock(dqp);
183 	return rval;
184 }
185 
186 STATIC void
187 xfs_qm_dquot_logitem_release(
188 	struct xfs_log_item	*lip)
189 {
190 	struct xfs_dquot	*dqp = DQUOT_ITEM(lip)->qli_dquot;
191 
192 	ASSERT(XFS_DQ_IS_LOCKED(dqp));
193 
194 	/*
195 	 * dquots are never 'held' from getting unlocked at the end of
196 	 * a transaction.  Their locking and unlocking is hidden inside the
197 	 * transaction layer, within trans_commit. Hence, no LI_HOLD flag
198 	 * for the logitem.
199 	 */
200 	xfs_dqunlock(dqp);
201 }
202 
203 STATIC void
204 xfs_qm_dquot_logitem_committing(
205 	struct xfs_log_item	*lip,
206 	xfs_lsn_t		commit_lsn)
207 {
208 	return xfs_qm_dquot_logitem_release(lip);
209 }
210 
211 static const struct xfs_item_ops xfs_dquot_item_ops = {
212 	.iop_size	= xfs_qm_dquot_logitem_size,
213 	.iop_format	= xfs_qm_dquot_logitem_format,
214 	.iop_pin	= xfs_qm_dquot_logitem_pin,
215 	.iop_unpin	= xfs_qm_dquot_logitem_unpin,
216 	.iop_release	= xfs_qm_dquot_logitem_release,
217 	.iop_committing	= xfs_qm_dquot_logitem_committing,
218 	.iop_push	= xfs_qm_dquot_logitem_push,
219 	.iop_error	= xfs_dquot_item_error
220 };
221 
222 /*
223  * Initialize the dquot log item for a newly allocated dquot.
224  * The dquot isn't locked at this point, but it isn't on any of the lists
225  * either, so we don't care.
226  */
227 void
228 xfs_qm_dquot_logitem_init(
229 	struct xfs_dquot	*dqp)
230 {
231 	struct xfs_dq_logitem	*lp = &dqp->q_logitem;
232 
233 	xfs_log_item_init(dqp->q_mount, &lp->qli_item, XFS_LI_DQUOT,
234 					&xfs_dquot_item_ops);
235 	lp->qli_dquot = dqp;
236 }
237 
238 /*------------------  QUOTAOFF LOG ITEMS  -------------------*/
239 
240 static inline struct xfs_qoff_logitem *QOFF_ITEM(struct xfs_log_item *lip)
241 {
242 	return container_of(lip, struct xfs_qoff_logitem, qql_item);
243 }
244 
245 
246 /*
247  * This returns the number of iovecs needed to log the given quotaoff item.
248  * We only need 1 iovec for an quotaoff item.  It just logs the
249  * quotaoff_log_format structure.
250  */
251 STATIC void
252 xfs_qm_qoff_logitem_size(
253 	struct xfs_log_item	*lip,
254 	int			*nvecs,
255 	int			*nbytes)
256 {
257 	*nvecs += 1;
258 	*nbytes += sizeof(struct xfs_qoff_logitem);
259 }
260 
261 STATIC void
262 xfs_qm_qoff_logitem_format(
263 	struct xfs_log_item	*lip,
264 	struct xfs_log_vec	*lv)
265 {
266 	struct xfs_qoff_logitem	*qflip = QOFF_ITEM(lip);
267 	struct xfs_log_iovec	*vecp = NULL;
268 	struct xfs_qoff_logformat *qlf;
269 
270 	qlf = xlog_prepare_iovec(lv, &vecp, XLOG_REG_TYPE_QUOTAOFF);
271 	qlf->qf_type = XFS_LI_QUOTAOFF;
272 	qlf->qf_size = 1;
273 	qlf->qf_flags = qflip->qql_flags;
274 	xlog_finish_iovec(lv, vecp, sizeof(struct xfs_qoff_logitem));
275 }
276 
277 /*
278  * There isn't much you can do to push a quotaoff item.  It is simply
279  * stuck waiting for the log to be flushed to disk.
280  */
281 STATIC uint
282 xfs_qm_qoff_logitem_push(
283 	struct xfs_log_item	*lip,
284 	struct list_head	*buffer_list)
285 {
286 	return XFS_ITEM_LOCKED;
287 }
288 
289 STATIC xfs_lsn_t
290 xfs_qm_qoffend_logitem_committed(
291 	struct xfs_log_item	*lip,
292 	xfs_lsn_t		lsn)
293 {
294 	struct xfs_qoff_logitem	*qfe = QOFF_ITEM(lip);
295 	struct xfs_qoff_logitem	*qfs = qfe->qql_start_lip;
296 
297 	xfs_qm_qoff_logitem_relse(qfs);
298 
299 	kmem_free(lip->li_lv_shadow);
300 	kmem_free(qfe);
301 	return (xfs_lsn_t)-1;
302 }
303 
304 STATIC void
305 xfs_qm_qoff_logitem_release(
306 	struct xfs_log_item	*lip)
307 {
308 	struct xfs_qoff_logitem	*qoff = QOFF_ITEM(lip);
309 
310 	if (test_bit(XFS_LI_ABORTED, &lip->li_flags)) {
311 		if (qoff->qql_start_lip)
312 			xfs_qm_qoff_logitem_relse(qoff->qql_start_lip);
313 		xfs_qm_qoff_logitem_relse(qoff);
314 	}
315 }
316 
317 static const struct xfs_item_ops xfs_qm_qoffend_logitem_ops = {
318 	.iop_size	= xfs_qm_qoff_logitem_size,
319 	.iop_format	= xfs_qm_qoff_logitem_format,
320 	.iop_committed	= xfs_qm_qoffend_logitem_committed,
321 	.iop_push	= xfs_qm_qoff_logitem_push,
322 	.iop_release	= xfs_qm_qoff_logitem_release,
323 };
324 
325 static const struct xfs_item_ops xfs_qm_qoff_logitem_ops = {
326 	.iop_size	= xfs_qm_qoff_logitem_size,
327 	.iop_format	= xfs_qm_qoff_logitem_format,
328 	.iop_push	= xfs_qm_qoff_logitem_push,
329 	.iop_release	= xfs_qm_qoff_logitem_release,
330 };
331 
332 /*
333  * Delete the quotaoff intent from the AIL and free it. On success,
334  * this should only be called for the start item. It can be used for
335  * either on shutdown or abort.
336  */
337 void
338 xfs_qm_qoff_logitem_relse(
339 	struct xfs_qoff_logitem	*qoff)
340 {
341 	struct xfs_log_item	*lip = &qoff->qql_item;
342 
343 	ASSERT(test_bit(XFS_LI_IN_AIL, &lip->li_flags) ||
344 	       test_bit(XFS_LI_ABORTED, &lip->li_flags) ||
345 	       XFS_FORCED_SHUTDOWN(lip->li_mountp));
346 	xfs_trans_ail_delete(lip, 0);
347 	kmem_free(lip->li_lv_shadow);
348 	kmem_free(qoff);
349 }
350 
351 /*
352  * Allocate and initialize an quotaoff item of the correct quota type(s).
353  */
354 struct xfs_qoff_logitem *
355 xfs_qm_qoff_logitem_init(
356 	struct xfs_mount	*mp,
357 	struct xfs_qoff_logitem	*start,
358 	uint			flags)
359 {
360 	struct xfs_qoff_logitem	*qf;
361 
362 	qf = kmem_zalloc(sizeof(struct xfs_qoff_logitem), 0);
363 
364 	xfs_log_item_init(mp, &qf->qql_item, XFS_LI_QUOTAOFF, start ?
365 			&xfs_qm_qoffend_logitem_ops : &xfs_qm_qoff_logitem_ops);
366 	qf->qql_item.li_mountp = mp;
367 	qf->qql_start_lip = start;
368 	qf->qql_flags = flags;
369 	return qf;
370 }
371