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1 /*
2  * Copyright (c) 2000-2003 Silicon Graphics, Inc.
3  * All Rights Reserved.
4  *
5  * This program is free software; you can redistribute it and/or
6  * modify it under the terms of the GNU General Public License as
7  * published by the Free Software Foundation.
8  *
9  * This program is distributed in the hope that it would be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12  * GNU General Public License for more details.
13  *
14  * You should have received a copy of the GNU General Public License
15  * along with this program; if not, write the Free Software Foundation,
16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
17  */
18 #include "xfs.h"
19 #include "xfs_fs.h"
20 #include "xfs_bit.h"
21 #include "xfs_log.h"
22 #include "xfs_inum.h"
23 #include "xfs_trans.h"
24 #include "xfs_sb.h"
25 #include "xfs_ag.h"
26 #include "xfs_dir2.h"
27 #include "xfs_alloc.h"
28 #include "xfs_dmapi.h"
29 #include "xfs_quota.h"
30 #include "xfs_mount.h"
31 #include "xfs_bmap_btree.h"
32 #include "xfs_alloc_btree.h"
33 #include "xfs_ialloc_btree.h"
34 #include "xfs_dir2_sf.h"
35 #include "xfs_attr_sf.h"
36 #include "xfs_dinode.h"
37 #include "xfs_inode.h"
38 #include "xfs_bmap.h"
39 #include "xfs_btree.h"
40 #include "xfs_ialloc.h"
41 #include "xfs_rtalloc.h"
42 #include "xfs_error.h"
43 #include "xfs_itable.h"
44 #include "xfs_rw.h"
45 #include "xfs_acl.h"
46 #include "xfs_attr.h"
47 #include "xfs_buf_item.h"
48 #include "xfs_trans_priv.h"
49 #include "xfs_qm.h"
50 
51 /*
52  * returns the number of iovecs needed to log the given dquot item.
53  */
54 /* ARGSUSED */
55 STATIC uint
xfs_qm_dquot_logitem_size(xfs_dq_logitem_t * logitem)56 xfs_qm_dquot_logitem_size(
57 	xfs_dq_logitem_t	*logitem)
58 {
59 	/*
60 	 * we need only two iovecs, one for the format, one for the real thing
61 	 */
62 	return (2);
63 }
64 
65 /*
66  * fills in the vector of log iovecs for the given dquot log item.
67  */
68 STATIC void
xfs_qm_dquot_logitem_format(xfs_dq_logitem_t * logitem,xfs_log_iovec_t * logvec)69 xfs_qm_dquot_logitem_format(
70 	xfs_dq_logitem_t	*logitem,
71 	xfs_log_iovec_t		*logvec)
72 {
73 	ASSERT(logitem);
74 	ASSERT(logitem->qli_dquot);
75 
76 	logvec->i_addr = (xfs_caddr_t)&logitem->qli_format;
77 	logvec->i_len  = sizeof(xfs_dq_logformat_t);
78 	XLOG_VEC_SET_TYPE(logvec, XLOG_REG_TYPE_QFORMAT);
79 	logvec++;
80 	logvec->i_addr = (xfs_caddr_t)&logitem->qli_dquot->q_core;
81 	logvec->i_len  = sizeof(xfs_disk_dquot_t);
82 	XLOG_VEC_SET_TYPE(logvec, XLOG_REG_TYPE_DQUOT);
83 
84 	ASSERT(2 == logitem->qli_item.li_desc->lid_size);
85 	logitem->qli_format.qlf_size = 2;
86 
87 }
88 
89 /*
90  * Increment the pin count of the given dquot.
91  */
92 STATIC void
xfs_qm_dquot_logitem_pin(xfs_dq_logitem_t * logitem)93 xfs_qm_dquot_logitem_pin(
94 	xfs_dq_logitem_t *logitem)
95 {
96 	xfs_dquot_t *dqp = logitem->qli_dquot;
97 
98 	ASSERT(XFS_DQ_IS_LOCKED(dqp));
99 	atomic_inc(&dqp->q_pincount);
100 }
101 
102 /*
103  * Decrement the pin count of the given dquot, and wake up
104  * anyone in xfs_dqwait_unpin() if the count goes to 0.	 The
105  * dquot must have been previously pinned with a call to
106  * xfs_qm_dquot_logitem_pin().
107  */
108 /* ARGSUSED */
109 STATIC void
xfs_qm_dquot_logitem_unpin(xfs_dq_logitem_t * logitem,int stale)110 xfs_qm_dquot_logitem_unpin(
111 	xfs_dq_logitem_t *logitem,
112 	int		  stale)
113 {
114 	xfs_dquot_t *dqp = logitem->qli_dquot;
115 
116 	ASSERT(atomic_read(&dqp->q_pincount) > 0);
117 	if (atomic_dec_and_test(&dqp->q_pincount))
118 		wake_up(&dqp->q_pinwait);
119 }
120 
121 /* ARGSUSED */
122 STATIC void
xfs_qm_dquot_logitem_unpin_remove(xfs_dq_logitem_t * logitem,xfs_trans_t * tp)123 xfs_qm_dquot_logitem_unpin_remove(
124 	xfs_dq_logitem_t *logitem,
125 	xfs_trans_t	 *tp)
126 {
127 	xfs_qm_dquot_logitem_unpin(logitem, 0);
128 }
129 
130 /*
131  * Given the logitem, this writes the corresponding dquot entry to disk
132  * asynchronously. This is called with the dquot entry securely locked;
133  * we simply get xfs_qm_dqflush() to do the work, and unlock the dquot
134  * at the end.
135  */
136 STATIC void
xfs_qm_dquot_logitem_push(xfs_dq_logitem_t * logitem)137 xfs_qm_dquot_logitem_push(
138 	xfs_dq_logitem_t	*logitem)
139 {
140 	xfs_dquot_t	*dqp;
141 	int		error;
142 
143 	dqp = logitem->qli_dquot;
144 
145 	ASSERT(XFS_DQ_IS_LOCKED(dqp));
146 	ASSERT(!completion_done(&dqp->q_flush));
147 
148 	/*
149 	 * Since we were able to lock the dquot's flush lock and
150 	 * we found it on the AIL, the dquot must be dirty.  This
151 	 * is because the dquot is removed from the AIL while still
152 	 * holding the flush lock in xfs_dqflush_done().  Thus, if
153 	 * we found it in the AIL and were able to obtain the flush
154 	 * lock without sleeping, then there must not have been
155 	 * anyone in the process of flushing the dquot.
156 	 */
157 	error = xfs_qm_dqflush(dqp, XFS_QMOPT_DELWRI);
158 	if (error)
159 		xfs_fs_cmn_err(CE_WARN, dqp->q_mount,
160 			"xfs_qm_dquot_logitem_push: push error %d on dqp %p",
161 			error, dqp);
162 	xfs_dqunlock(dqp);
163 }
164 
165 /*ARGSUSED*/
166 STATIC xfs_lsn_t
xfs_qm_dquot_logitem_committed(xfs_dq_logitem_t * l,xfs_lsn_t lsn)167 xfs_qm_dquot_logitem_committed(
168 	xfs_dq_logitem_t	*l,
169 	xfs_lsn_t		lsn)
170 {
171 	/*
172 	 * We always re-log the entire dquot when it becomes dirty,
173 	 * so, the latest copy _is_ the only one that matters.
174 	 */
175 	return (lsn);
176 }
177 
178 
179 /*
180  * This is called to wait for the given dquot to be unpinned.
181  * Most of these pin/unpin routines are plagiarized from inode code.
182  */
183 void
xfs_qm_dqunpin_wait(xfs_dquot_t * dqp)184 xfs_qm_dqunpin_wait(
185 	xfs_dquot_t	*dqp)
186 {
187 	ASSERT(XFS_DQ_IS_LOCKED(dqp));
188 	if (atomic_read(&dqp->q_pincount) == 0)
189 		return;
190 
191 	/*
192 	 * Give the log a push so we don't wait here too long.
193 	 */
194 	xfs_log_force(dqp->q_mount, (xfs_lsn_t)0, XFS_LOG_FORCE);
195 	wait_event(dqp->q_pinwait, (atomic_read(&dqp->q_pincount) == 0));
196 }
197 
198 /*
199  * This is called when IOP_TRYLOCK returns XFS_ITEM_PUSHBUF to indicate that
200  * the dquot is locked by us, but the flush lock isn't. So, here we are
201  * going to see if the relevant dquot buffer is incore, waiting on DELWRI.
202  * If so, we want to push it out to help us take this item off the AIL as soon
203  * as possible.
204  *
205  * We must not be holding the AIL lock at this point. Calling incore() to
206  * search the buffer cache can be a time consuming thing, and AIL lock is a
207  * spinlock.
208  */
209 STATIC void
xfs_qm_dquot_logitem_pushbuf(xfs_dq_logitem_t * qip)210 xfs_qm_dquot_logitem_pushbuf(
211 	xfs_dq_logitem_t    *qip)
212 {
213 	xfs_dquot_t	*dqp;
214 	xfs_mount_t	*mp;
215 	xfs_buf_t	*bp;
216 	uint		dopush;
217 
218 	dqp = qip->qli_dquot;
219 	ASSERT(XFS_DQ_IS_LOCKED(dqp));
220 
221 	/*
222 	 * The qli_pushbuf_flag keeps others from
223 	 * trying to duplicate our effort.
224 	 */
225 	ASSERT(qip->qli_pushbuf_flag != 0);
226 	ASSERT(qip->qli_push_owner == current_pid());
227 
228 	/*
229 	 * If flushlock isn't locked anymore, chances are that the
230 	 * inode flush completed and the inode was taken off the AIL.
231 	 * So, just get out.
232 	 */
233 	if (completion_done(&dqp->q_flush)  ||
234 	    ((qip->qli_item.li_flags & XFS_LI_IN_AIL) == 0)) {
235 		qip->qli_pushbuf_flag = 0;
236 		xfs_dqunlock(dqp);
237 		return;
238 	}
239 	mp = dqp->q_mount;
240 	bp = xfs_incore(mp->m_ddev_targp, qip->qli_format.qlf_blkno,
241 		    XFS_QI_DQCHUNKLEN(mp),
242 		    XFS_INCORE_TRYLOCK);
243 	if (bp != NULL) {
244 		if (XFS_BUF_ISDELAYWRITE(bp)) {
245 			dopush = ((qip->qli_item.li_flags & XFS_LI_IN_AIL) &&
246 				  !completion_done(&dqp->q_flush));
247 			qip->qli_pushbuf_flag = 0;
248 			xfs_dqunlock(dqp);
249 
250 			if (XFS_BUF_ISPINNED(bp)) {
251 				xfs_log_force(mp, (xfs_lsn_t)0,
252 					      XFS_LOG_FORCE);
253 			}
254 			if (dopush) {
255 				int	error;
256 #ifdef XFSRACEDEBUG
257 				delay_for_intr();
258 				delay(300);
259 #endif
260 				error = xfs_bawrite(mp, bp);
261 				if (error)
262 					xfs_fs_cmn_err(CE_WARN, mp,
263 	"xfs_qm_dquot_logitem_pushbuf: pushbuf error %d on qip %p, bp %p",
264 							error, qip, bp);
265 			} else {
266 				xfs_buf_relse(bp);
267 			}
268 		} else {
269 			qip->qli_pushbuf_flag = 0;
270 			xfs_dqunlock(dqp);
271 			xfs_buf_relse(bp);
272 		}
273 		return;
274 	}
275 
276 	qip->qli_pushbuf_flag = 0;
277 	xfs_dqunlock(dqp);
278 }
279 
280 /*
281  * This is called to attempt to lock the dquot associated with this
282  * dquot log item.  Don't sleep on the dquot lock or the flush lock.
283  * If the flush lock is already held, indicating that the dquot has
284  * been or is in the process of being flushed, then see if we can
285  * find the dquot's buffer in the buffer cache without sleeping.  If
286  * we can and it is marked delayed write, then we want to send it out.
287  * We delay doing so until the push routine, though, to avoid sleeping
288  * in any device strategy routines.
289  */
290 STATIC uint
xfs_qm_dquot_logitem_trylock(xfs_dq_logitem_t * qip)291 xfs_qm_dquot_logitem_trylock(
292 	xfs_dq_logitem_t	*qip)
293 {
294 	xfs_dquot_t		*dqp;
295 	uint			retval;
296 
297 	dqp = qip->qli_dquot;
298 	if (atomic_read(&dqp->q_pincount) > 0)
299 		return (XFS_ITEM_PINNED);
300 
301 	if (! xfs_qm_dqlock_nowait(dqp))
302 		return (XFS_ITEM_LOCKED);
303 
304 	retval = XFS_ITEM_SUCCESS;
305 	if (!xfs_dqflock_nowait(dqp)) {
306 		/*
307 		 * The dquot is already being flushed.	It may have been
308 		 * flushed delayed write, however, and we don't want to
309 		 * get stuck waiting for that to complete.  So, we want to check
310 		 * to see if we can lock the dquot's buffer without sleeping.
311 		 * If we can and it is marked for delayed write, then we
312 		 * hold it and send it out from the push routine.  We don't
313 		 * want to do that now since we might sleep in the device
314 		 * strategy routine.  We also don't want to grab the buffer lock
315 		 * here because we'd like not to call into the buffer cache
316 		 * while holding the AIL lock.
317 		 * Make sure to only return PUSHBUF if we set pushbuf_flag
318 		 * ourselves.  If someone else is doing it then we don't
319 		 * want to go to the push routine and duplicate their efforts.
320 		 */
321 		if (qip->qli_pushbuf_flag == 0) {
322 			qip->qli_pushbuf_flag = 1;
323 			ASSERT(qip->qli_format.qlf_blkno == dqp->q_blkno);
324 #ifdef DEBUG
325 			qip->qli_push_owner = current_pid();
326 #endif
327 			/*
328 			 * The dquot is left locked.
329 			 */
330 			retval = XFS_ITEM_PUSHBUF;
331 		} else {
332 			retval = XFS_ITEM_FLUSHING;
333 			xfs_dqunlock_nonotify(dqp);
334 		}
335 	}
336 
337 	ASSERT(qip->qli_item.li_flags & XFS_LI_IN_AIL);
338 	return (retval);
339 }
340 
341 
342 /*
343  * Unlock the dquot associated with the log item.
344  * Clear the fields of the dquot and dquot log item that
345  * are specific to the current transaction.  If the
346  * hold flags is set, do not unlock the dquot.
347  */
348 STATIC void
xfs_qm_dquot_logitem_unlock(xfs_dq_logitem_t * ql)349 xfs_qm_dquot_logitem_unlock(
350 	xfs_dq_logitem_t    *ql)
351 {
352 	xfs_dquot_t	*dqp;
353 
354 	ASSERT(ql != NULL);
355 	dqp = ql->qli_dquot;
356 	ASSERT(XFS_DQ_IS_LOCKED(dqp));
357 
358 	/*
359 	 * Clear the transaction pointer in the dquot
360 	 */
361 	dqp->q_transp = NULL;
362 
363 	/*
364 	 * dquots are never 'held' from getting unlocked at the end of
365 	 * a transaction.  Their locking and unlocking is hidden inside the
366 	 * transaction layer, within trans_commit. Hence, no LI_HOLD flag
367 	 * for the logitem.
368 	 */
369 	xfs_dqunlock(dqp);
370 }
371 
372 
373 /*
374  * this needs to stamp an lsn into the dquot, I think.
375  * rpc's that look at user dquot's would then have to
376  * push on the dependency recorded in the dquot
377  */
378 /* ARGSUSED */
379 STATIC void
xfs_qm_dquot_logitem_committing(xfs_dq_logitem_t * l,xfs_lsn_t lsn)380 xfs_qm_dquot_logitem_committing(
381 	xfs_dq_logitem_t	*l,
382 	xfs_lsn_t		lsn)
383 {
384 	return;
385 }
386 
387 
388 /*
389  * This is the ops vector for dquots
390  */
391 static struct xfs_item_ops xfs_dquot_item_ops = {
392 	.iop_size	= (uint(*)(xfs_log_item_t*))xfs_qm_dquot_logitem_size,
393 	.iop_format	= (void(*)(xfs_log_item_t*, xfs_log_iovec_t*))
394 					xfs_qm_dquot_logitem_format,
395 	.iop_pin	= (void(*)(xfs_log_item_t*))xfs_qm_dquot_logitem_pin,
396 	.iop_unpin	= (void(*)(xfs_log_item_t*, int))
397 					xfs_qm_dquot_logitem_unpin,
398 	.iop_unpin_remove = (void(*)(xfs_log_item_t*, xfs_trans_t*))
399 					xfs_qm_dquot_logitem_unpin_remove,
400 	.iop_trylock	= (uint(*)(xfs_log_item_t*))
401 					xfs_qm_dquot_logitem_trylock,
402 	.iop_unlock	= (void(*)(xfs_log_item_t*))xfs_qm_dquot_logitem_unlock,
403 	.iop_committed	= (xfs_lsn_t(*)(xfs_log_item_t*, xfs_lsn_t))
404 					xfs_qm_dquot_logitem_committed,
405 	.iop_push	= (void(*)(xfs_log_item_t*))xfs_qm_dquot_logitem_push,
406 	.iop_pushbuf	= (void(*)(xfs_log_item_t*))
407 					xfs_qm_dquot_logitem_pushbuf,
408 	.iop_committing = (void(*)(xfs_log_item_t*, xfs_lsn_t))
409 					xfs_qm_dquot_logitem_committing
410 };
411 
412 /*
413  * Initialize the dquot log item for a newly allocated dquot.
414  * The dquot isn't locked at this point, but it isn't on any of the lists
415  * either, so we don't care.
416  */
417 void
xfs_qm_dquot_logitem_init(struct xfs_dquot * dqp)418 xfs_qm_dquot_logitem_init(
419 	struct xfs_dquot *dqp)
420 {
421 	xfs_dq_logitem_t  *lp;
422 	lp = &dqp->q_logitem;
423 
424 	lp->qli_item.li_type = XFS_LI_DQUOT;
425 	lp->qli_item.li_ops = &xfs_dquot_item_ops;
426 	lp->qli_item.li_mountp = dqp->q_mount;
427 	lp->qli_dquot = dqp;
428 	lp->qli_format.qlf_type = XFS_LI_DQUOT;
429 	lp->qli_format.qlf_id = be32_to_cpu(dqp->q_core.d_id);
430 	lp->qli_format.qlf_blkno = dqp->q_blkno;
431 	lp->qli_format.qlf_len = 1;
432 	/*
433 	 * This is just the offset of this dquot within its buffer
434 	 * (which is currently 1 FSB and probably won't change).
435 	 * Hence 32 bits for this offset should be just fine.
436 	 * Alternatively, we can store (bufoffset / sizeof(xfs_dqblk_t))
437 	 * here, and recompute it at recovery time.
438 	 */
439 	lp->qli_format.qlf_boffset = (__uint32_t)dqp->q_bufoffset;
440 }
441 
442 /*------------------  QUOTAOFF LOG ITEMS  -------------------*/
443 
444 /*
445  * This returns the number of iovecs needed to log the given quotaoff item.
446  * We only need 1 iovec for an quotaoff item.  It just logs the
447  * quotaoff_log_format structure.
448  */
449 /*ARGSUSED*/
450 STATIC uint
xfs_qm_qoff_logitem_size(xfs_qoff_logitem_t * qf)451 xfs_qm_qoff_logitem_size(xfs_qoff_logitem_t *qf)
452 {
453 	return (1);
454 }
455 
456 /*
457  * This is called to fill in the vector of log iovecs for the
458  * given quotaoff log item. We use only 1 iovec, and we point that
459  * at the quotaoff_log_format structure embedded in the quotaoff item.
460  * It is at this point that we assert that all of the extent
461  * slots in the quotaoff item have been filled.
462  */
463 STATIC void
xfs_qm_qoff_logitem_format(xfs_qoff_logitem_t * qf,xfs_log_iovec_t * log_vector)464 xfs_qm_qoff_logitem_format(xfs_qoff_logitem_t	*qf,
465 			   xfs_log_iovec_t	*log_vector)
466 {
467 	ASSERT(qf->qql_format.qf_type == XFS_LI_QUOTAOFF);
468 
469 	log_vector->i_addr = (xfs_caddr_t)&(qf->qql_format);
470 	log_vector->i_len = sizeof(xfs_qoff_logitem_t);
471 	XLOG_VEC_SET_TYPE(log_vector, XLOG_REG_TYPE_QUOTAOFF);
472 	qf->qql_format.qf_size = 1;
473 }
474 
475 
476 /*
477  * Pinning has no meaning for an quotaoff item, so just return.
478  */
479 /*ARGSUSED*/
480 STATIC void
xfs_qm_qoff_logitem_pin(xfs_qoff_logitem_t * qf)481 xfs_qm_qoff_logitem_pin(xfs_qoff_logitem_t *qf)
482 {
483 	return;
484 }
485 
486 
487 /*
488  * Since pinning has no meaning for an quotaoff item, unpinning does
489  * not either.
490  */
491 /*ARGSUSED*/
492 STATIC void
xfs_qm_qoff_logitem_unpin(xfs_qoff_logitem_t * qf,int stale)493 xfs_qm_qoff_logitem_unpin(xfs_qoff_logitem_t *qf, int stale)
494 {
495 	return;
496 }
497 
498 /*ARGSUSED*/
499 STATIC void
xfs_qm_qoff_logitem_unpin_remove(xfs_qoff_logitem_t * qf,xfs_trans_t * tp)500 xfs_qm_qoff_logitem_unpin_remove(xfs_qoff_logitem_t *qf, xfs_trans_t *tp)
501 {
502 	return;
503 }
504 
505 /*
506  * Quotaoff items have no locking, so just return success.
507  */
508 /*ARGSUSED*/
509 STATIC uint
xfs_qm_qoff_logitem_trylock(xfs_qoff_logitem_t * qf)510 xfs_qm_qoff_logitem_trylock(xfs_qoff_logitem_t *qf)
511 {
512 	return XFS_ITEM_LOCKED;
513 }
514 
515 /*
516  * Quotaoff items have no locking or pushing, so return failure
517  * so that the caller doesn't bother with us.
518  */
519 /*ARGSUSED*/
520 STATIC void
xfs_qm_qoff_logitem_unlock(xfs_qoff_logitem_t * qf)521 xfs_qm_qoff_logitem_unlock(xfs_qoff_logitem_t *qf)
522 {
523 	return;
524 }
525 
526 /*
527  * The quotaoff-start-item is logged only once and cannot be moved in the log,
528  * so simply return the lsn at which it's been logged.
529  */
530 /*ARGSUSED*/
531 STATIC xfs_lsn_t
xfs_qm_qoff_logitem_committed(xfs_qoff_logitem_t * qf,xfs_lsn_t lsn)532 xfs_qm_qoff_logitem_committed(xfs_qoff_logitem_t *qf, xfs_lsn_t lsn)
533 {
534 	return (lsn);
535 }
536 
537 /*
538  * There isn't much you can do to push on an quotaoff item.  It is simply
539  * stuck waiting for the log to be flushed to disk.
540  */
541 /*ARGSUSED*/
542 STATIC void
xfs_qm_qoff_logitem_push(xfs_qoff_logitem_t * qf)543 xfs_qm_qoff_logitem_push(xfs_qoff_logitem_t *qf)
544 {
545 	return;
546 }
547 
548 
549 /*ARGSUSED*/
550 STATIC xfs_lsn_t
xfs_qm_qoffend_logitem_committed(xfs_qoff_logitem_t * qfe,xfs_lsn_t lsn)551 xfs_qm_qoffend_logitem_committed(
552 	xfs_qoff_logitem_t *qfe,
553 	xfs_lsn_t lsn)
554 {
555 	xfs_qoff_logitem_t	*qfs;
556 	struct xfs_ail		*ailp;
557 
558 	qfs = qfe->qql_start_lip;
559 	ailp = qfs->qql_item.li_ailp;
560 	spin_lock(&ailp->xa_lock);
561 	/*
562 	 * Delete the qoff-start logitem from the AIL.
563 	 * xfs_trans_ail_delete() drops the AIL lock.
564 	 */
565 	xfs_trans_ail_delete(ailp, (xfs_log_item_t *)qfs);
566 	kmem_free(qfs);
567 	kmem_free(qfe);
568 	return (xfs_lsn_t)-1;
569 }
570 
571 /*
572  * XXX rcc - don't know quite what to do with this.  I think we can
573  * just ignore it.  The only time that isn't the case is if we allow
574  * the client to somehow see that quotas have been turned off in which
575  * we can't allow that to get back until the quotaoff hits the disk.
576  * So how would that happen?  Also, do we need different routines for
577  * quotaoff start and quotaoff end?  I suspect the answer is yes but
578  * to be sure, I need to look at the recovery code and see how quota off
579  * recovery is handled (do we roll forward or back or do something else).
580  * If we roll forwards or backwards, then we need two separate routines,
581  * one that does nothing and one that stamps in the lsn that matters
582  * (truly makes the quotaoff irrevocable).  If we do something else,
583  * then maybe we don't need two.
584  */
585 /* ARGSUSED */
586 STATIC void
xfs_qm_qoff_logitem_committing(xfs_qoff_logitem_t * qip,xfs_lsn_t commit_lsn)587 xfs_qm_qoff_logitem_committing(xfs_qoff_logitem_t *qip, xfs_lsn_t commit_lsn)
588 {
589 	return;
590 }
591 
592 /* ARGSUSED */
593 STATIC void
xfs_qm_qoffend_logitem_committing(xfs_qoff_logitem_t * qip,xfs_lsn_t commit_lsn)594 xfs_qm_qoffend_logitem_committing(xfs_qoff_logitem_t *qip, xfs_lsn_t commit_lsn)
595 {
596 	return;
597 }
598 
599 static struct xfs_item_ops xfs_qm_qoffend_logitem_ops = {
600 	.iop_size	= (uint(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_size,
601 	.iop_format	= (void(*)(xfs_log_item_t*, xfs_log_iovec_t*))
602 					xfs_qm_qoff_logitem_format,
603 	.iop_pin	= (void(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_pin,
604 	.iop_unpin	= (void(*)(xfs_log_item_t* ,int))
605 					xfs_qm_qoff_logitem_unpin,
606 	.iop_unpin_remove = (void(*)(xfs_log_item_t*,xfs_trans_t*))
607 					xfs_qm_qoff_logitem_unpin_remove,
608 	.iop_trylock	= (uint(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_trylock,
609 	.iop_unlock	= (void(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_unlock,
610 	.iop_committed	= (xfs_lsn_t(*)(xfs_log_item_t*, xfs_lsn_t))
611 					xfs_qm_qoffend_logitem_committed,
612 	.iop_push	= (void(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_push,
613 	.iop_pushbuf	= NULL,
614 	.iop_committing = (void(*)(xfs_log_item_t*, xfs_lsn_t))
615 					xfs_qm_qoffend_logitem_committing
616 };
617 
618 /*
619  * This is the ops vector shared by all quotaoff-start log items.
620  */
621 static struct xfs_item_ops xfs_qm_qoff_logitem_ops = {
622 	.iop_size	= (uint(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_size,
623 	.iop_format	= (void(*)(xfs_log_item_t*, xfs_log_iovec_t*))
624 					xfs_qm_qoff_logitem_format,
625 	.iop_pin	= (void(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_pin,
626 	.iop_unpin	= (void(*)(xfs_log_item_t*, int))
627 					xfs_qm_qoff_logitem_unpin,
628 	.iop_unpin_remove = (void(*)(xfs_log_item_t*,xfs_trans_t*))
629 					xfs_qm_qoff_logitem_unpin_remove,
630 	.iop_trylock	= (uint(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_trylock,
631 	.iop_unlock	= (void(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_unlock,
632 	.iop_committed	= (xfs_lsn_t(*)(xfs_log_item_t*, xfs_lsn_t))
633 					xfs_qm_qoff_logitem_committed,
634 	.iop_push	= (void(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_push,
635 	.iop_pushbuf	= NULL,
636 	.iop_committing = (void(*)(xfs_log_item_t*, xfs_lsn_t))
637 					xfs_qm_qoff_logitem_committing
638 };
639 
640 /*
641  * Allocate and initialize an quotaoff item of the correct quota type(s).
642  */
643 xfs_qoff_logitem_t *
xfs_qm_qoff_logitem_init(struct xfs_mount * mp,xfs_qoff_logitem_t * start,uint flags)644 xfs_qm_qoff_logitem_init(
645 	struct xfs_mount *mp,
646 	xfs_qoff_logitem_t *start,
647 	uint flags)
648 {
649 	xfs_qoff_logitem_t	*qf;
650 
651 	qf = (xfs_qoff_logitem_t*) kmem_zalloc(sizeof(xfs_qoff_logitem_t), KM_SLEEP);
652 
653 	qf->qql_item.li_type = XFS_LI_QUOTAOFF;
654 	if (start)
655 		qf->qql_item.li_ops = &xfs_qm_qoffend_logitem_ops;
656 	else
657 		qf->qql_item.li_ops = &xfs_qm_qoff_logitem_ops;
658 	qf->qql_item.li_mountp = mp;
659 	qf->qql_format.qf_type = XFS_LI_QUOTAOFF;
660 	qf->qql_format.qf_flags = flags;
661 	qf->qql_start_lip = start;
662 	return (qf);
663 }
664