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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Nathan Scott4ce31212005-11-02 14:59:41 +11002 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 *
Nathan Scott4ce31212005-11-02 14:59:41 +11005 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 * published by the Free Software Foundation.
8 *
Nathan Scott4ce31212005-11-02 14:59:41 +11009 * 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.
Linus Torvalds1da177e2005-04-16 15:20:36 -070013 *
Nathan Scott4ce31212005-11-02 14:59:41 +110014 * 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070017 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#include "xfs.h"
19#include "xfs_fs.h"
Nathan Scotta844f452005-11-02 14:38:42 +110020#include "xfs_bit.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070021#include "xfs_log.h"
Nathan Scotta844f452005-11-02 14:38:42 +110022#include "xfs_inum.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#include "xfs_clnt.h"
24#include "xfs_trans.h"
25#include "xfs_sb.h"
26#include "xfs_ag.h"
27#include "xfs_dir.h"
28#include "xfs_dir2.h"
29#include "xfs_alloc.h"
30#include "xfs_dmapi.h"
31#include "xfs_quota.h"
32#include "xfs_mount.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070033#include "xfs_bmap_btree.h"
Nathan Scotta844f452005-11-02 14:38:42 +110034#include "xfs_alloc_btree.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070035#include "xfs_ialloc_btree.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070036#include "xfs_dir_sf.h"
37#include "xfs_dir2_sf.h"
Nathan Scotta844f452005-11-02 14:38:42 +110038#include "xfs_attr_sf.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070039#include "xfs_dinode.h"
40#include "xfs_inode.h"
Nathan Scotta844f452005-11-02 14:38:42 +110041#include "xfs_btree.h"
42#include "xfs_ialloc.h"
43#include "xfs_itable.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070044#include "xfs_rtalloc.h"
45#include "xfs_error.h"
Nathan Scotta844f452005-11-02 14:38:42 +110046#include "xfs_bmap.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070047#include "xfs_rw.h"
48#include "xfs_acl.h"
49#include "xfs_cap.h"
50#include "xfs_mac.h"
51#include "xfs_attr.h"
52#include "xfs_buf_item.h"
53#include "xfs_trans_space.h"
54#include "xfs_utils.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070055#include "xfs_qm.h"
56
57/*
58 * The global quota manager. There is only one of these for the entire
59 * system, _not_ one per file system. XQM keeps track of the overall
60 * quota functionality, including maintaining the freelist and hash
61 * tables of dquots.
62 */
Nathan Scott6b3f6b52005-11-02 15:08:25 +110063mutex_t xfs_Gqm_lock;
Linus Torvalds1da177e2005-04-16 15:20:36 -070064struct xfs_qm *xfs_Gqm;
Nathan Scott6b3f6b52005-11-02 15:08:25 +110065uint ndquot;
Linus Torvalds1da177e2005-04-16 15:20:36 -070066
67kmem_zone_t *qm_dqzone;
68kmem_zone_t *qm_dqtrxzone;
Christoph Hellwigba0f32d2005-06-21 15:36:52 +100069STATIC kmem_shaker_t xfs_qm_shaker;
Linus Torvalds1da177e2005-04-16 15:20:36 -070070
71STATIC void xfs_qm_list_init(xfs_dqlist_t *, char *, int);
72STATIC void xfs_qm_list_destroy(xfs_dqlist_t *);
73
Christoph Hellwigba0f32d2005-06-21 15:36:52 +100074STATIC void xfs_qm_freelist_init(xfs_frlist_t *);
75STATIC void xfs_qm_freelist_destroy(xfs_frlist_t *);
76STATIC int xfs_qm_mplist_nowait(xfs_mount_t *);
77STATIC int xfs_qm_dqhashlock_nowait(xfs_dquot_t *);
78
Linus Torvalds1da177e2005-04-16 15:20:36 -070079STATIC int xfs_qm_init_quotainos(xfs_mount_t *);
Christoph Hellwigba0f32d2005-06-21 15:36:52 +100080STATIC int xfs_qm_init_quotainfo(xfs_mount_t *);
Al Viro51bfb752005-12-15 09:17:24 +000081STATIC int xfs_qm_shake(int, gfp_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -070082
83#ifdef DEBUG
84extern mutex_t qcheck_lock;
85#endif
86
87#ifdef QUOTADEBUG
88#define XQM_LIST_PRINT(l, NXT, title) \
89{ \
90 xfs_dquot_t *dqp; int i = 0; \
91 cmn_err(CE_DEBUG, "%s (#%d)", title, (int) (l)->qh_nelems); \
92 for (dqp = (l)->qh_next; dqp != NULL; dqp = dqp->NXT) { \
93 cmn_err(CE_DEBUG, " %d. \"%d (%s)\" " \
94 "bcnt = %d, icnt = %d, refs = %d", \
Christoph Hellwig1149d962005-11-02 15:01:12 +110095 ++i, (int) be32_to_cpu(dqp->q_core.d_id), \
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 DQFLAGTO_TYPESTR(dqp), \
Christoph Hellwig1149d962005-11-02 15:01:12 +110097 (int) be64_to_cpu(dqp->q_core.d_bcount), \
98 (int) be64_to_cpu(dqp->q_core.d_icount), \
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 (int) dqp->q_nrefs); } \
100}
101#else
102#define XQM_LIST_PRINT(l, NXT, title) do { } while (0)
103#endif
104
105/*
106 * Initialize the XQM structure.
107 * Note that there is not one quota manager per file system.
108 */
109STATIC struct xfs_qm *
110xfs_Gqm_init(void)
111{
Nathan Scott6b3f6b52005-11-02 15:08:25 +1100112 xfs_dqhash_t *udqhash, *gdqhash;
113 xfs_qm_t *xqm;
114 uint i, hsize, flags = KM_SLEEP | KM_MAYFAIL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115
116 /*
117 * Initialize the dquot hash tables.
118 */
Nathan Scott6b3f6b52005-11-02 15:08:25 +1100119 hsize = XFS_QM_HASHSIZE_HIGH;
120 while (!(udqhash = kmem_zalloc(hsize * sizeof(xfs_dqhash_t), flags))) {
121 if ((hsize >>= 1) <= XFS_QM_HASHSIZE_LOW)
122 flags = KM_SLEEP;
123 }
124 gdqhash = kmem_zalloc(hsize * sizeof(xfs_dqhash_t), KM_SLEEP);
125 ndquot = hsize << 8;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126
Nathan Scott6b3f6b52005-11-02 15:08:25 +1100127 xqm = kmem_zalloc(sizeof(xfs_qm_t), KM_SLEEP);
128 xqm->qm_dqhashmask = hsize - 1;
129 xqm->qm_usr_dqhtable = udqhash;
130 xqm->qm_grp_dqhtable = gdqhash;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 ASSERT(xqm->qm_usr_dqhtable != NULL);
132 ASSERT(xqm->qm_grp_dqhtable != NULL);
133
134 for (i = 0; i < hsize; i++) {
135 xfs_qm_list_init(&(xqm->qm_usr_dqhtable[i]), "uxdqh", i);
136 xfs_qm_list_init(&(xqm->qm_grp_dqhtable[i]), "gxdqh", i);
137 }
138
139 /*
140 * Freelist of all dquots of all file systems
141 */
142 xfs_qm_freelist_init(&(xqm->qm_dqfreelist));
143
144 /*
145 * dquot zone. we register our own low-memory callback.
146 */
147 if (!qm_dqzone) {
148 xqm->qm_dqzone = kmem_zone_init(sizeof(xfs_dquot_t),
149 "xfs_dquots");
150 qm_dqzone = xqm->qm_dqzone;
151 } else
152 xqm->qm_dqzone = qm_dqzone;
153
154 xfs_qm_shaker = kmem_shake_register(xfs_qm_shake);
155
156 /*
157 * The t_dqinfo portion of transactions.
158 */
159 if (!qm_dqtrxzone) {
160 xqm->qm_dqtrxzone = kmem_zone_init(sizeof(xfs_dquot_acct_t),
161 "xfs_dqtrx");
162 qm_dqtrxzone = xqm->qm_dqtrxzone;
163 } else
164 xqm->qm_dqtrxzone = qm_dqtrxzone;
165
166 atomic_set(&xqm->qm_totaldquots, 0);
167 xqm->qm_dqfree_ratio = XFS_QM_DQFREE_RATIO;
168 xqm->qm_nrefs = 0;
169#ifdef DEBUG
Jes Sorensen794ee1b2006-01-09 15:59:21 -0800170 xfs_mutex_init(&qcheck_lock, MUTEX_DEFAULT, "qchk");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171#endif
172 return xqm;
173}
174
175/*
176 * Destroy the global quota manager when its reference count goes to zero.
177 */
Christoph Hellwigba0f32d2005-06-21 15:36:52 +1000178STATIC void
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179xfs_qm_destroy(
180 struct xfs_qm *xqm)
181{
182 int hsize, i;
183
184 ASSERT(xqm != NULL);
185 ASSERT(xqm->qm_nrefs == 0);
186 kmem_shake_deregister(xfs_qm_shaker);
187 hsize = xqm->qm_dqhashmask + 1;
188 for (i = 0; i < hsize; i++) {
189 xfs_qm_list_destroy(&(xqm->qm_usr_dqhtable[i]));
190 xfs_qm_list_destroy(&(xqm->qm_grp_dqhtable[i]));
191 }
192 kmem_free(xqm->qm_usr_dqhtable, hsize * sizeof(xfs_dqhash_t));
193 kmem_free(xqm->qm_grp_dqhtable, hsize * sizeof(xfs_dqhash_t));
194 xqm->qm_usr_dqhtable = NULL;
195 xqm->qm_grp_dqhtable = NULL;
196 xqm->qm_dqhashmask = 0;
197 xfs_qm_freelist_destroy(&(xqm->qm_dqfreelist));
198#ifdef DEBUG
199 mutex_destroy(&qcheck_lock);
200#endif
201 kmem_free(xqm, sizeof(xfs_qm_t));
202}
203
204/*
205 * Called at mount time to let XQM know that another file system is
206 * starting quotas. This isn't crucial information as the individual mount
207 * structures are pretty independent, but it helps the XQM keep a
208 * global view of what's going on.
209 */
210/* ARGSUSED */
211STATIC int
212xfs_qm_hold_quotafs_ref(
213 struct xfs_mount *mp)
214{
215 /*
216 * Need to lock the xfs_Gqm structure for things like this. For example,
217 * the structure could disappear between the entry to this routine and
218 * a HOLD operation if not locked.
219 */
220 XFS_QM_LOCK(xfs_Gqm);
221
222 if (xfs_Gqm == NULL)
223 xfs_Gqm = xfs_Gqm_init();
224 /*
225 * We can keep a list of all filesystems with quotas mounted for
226 * debugging and statistical purposes, but ...
227 * Just take a reference and get out.
228 */
229 XFS_QM_HOLD(xfs_Gqm);
230 XFS_QM_UNLOCK(xfs_Gqm);
231
232 return 0;
233}
234
235
236/*
237 * Release the reference that a filesystem took at mount time,
238 * so that we know when we need to destroy the entire quota manager.
239 */
240/* ARGSUSED */
241STATIC void
242xfs_qm_rele_quotafs_ref(
243 struct xfs_mount *mp)
244{
245 xfs_dquot_t *dqp, *nextdqp;
246
247 ASSERT(xfs_Gqm);
248 ASSERT(xfs_Gqm->qm_nrefs > 0);
249
250 /*
251 * Go thru the freelist and destroy all inactive dquots.
252 */
253 xfs_qm_freelist_lock(xfs_Gqm);
254
255 for (dqp = xfs_Gqm->qm_dqfreelist.qh_next;
256 dqp != (xfs_dquot_t *)&(xfs_Gqm->qm_dqfreelist); ) {
257 xfs_dqlock(dqp);
258 nextdqp = dqp->dq_flnext;
259 if (dqp->dq_flags & XFS_DQ_INACTIVE) {
260 ASSERT(dqp->q_mount == NULL);
261 ASSERT(! XFS_DQ_IS_DIRTY(dqp));
262 ASSERT(dqp->HL_PREVP == NULL);
263 ASSERT(dqp->MPL_PREVP == NULL);
264 XQM_FREELIST_REMOVE(dqp);
265 xfs_dqunlock(dqp);
266 xfs_qm_dqdestroy(dqp);
267 } else {
268 xfs_dqunlock(dqp);
269 }
270 dqp = nextdqp;
271 }
272 xfs_qm_freelist_unlock(xfs_Gqm);
273
274 /*
275 * Destroy the entire XQM. If somebody mounts with quotaon, this'll
276 * be restarted.
277 */
278 XFS_QM_LOCK(xfs_Gqm);
279 XFS_QM_RELE(xfs_Gqm);
280 if (xfs_Gqm->qm_nrefs == 0) {
281 xfs_qm_destroy(xfs_Gqm);
282 xfs_Gqm = NULL;
283 }
284 XFS_QM_UNLOCK(xfs_Gqm);
285}
286
287/*
288 * This is called at mount time from xfs_mountfs to initialize the quotainfo
289 * structure and start the global quotamanager (xfs_Gqm) if it hasn't done
290 * so already. Note that the superblock has not been read in yet.
291 */
292void
293xfs_qm_mount_quotainit(
294 xfs_mount_t *mp,
295 uint flags)
296{
297 /*
Nathan Scottc8ad20f2005-06-21 15:38:48 +1000298 * User, projects or group quotas has to be on.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299 */
Nathan Scottc8ad20f2005-06-21 15:38:48 +1000300 ASSERT(flags & (XFSMNT_UQUOTA | XFSMNT_PQUOTA | XFSMNT_GQUOTA));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301
302 /*
303 * Initialize the flags in the mount structure. From this point
304 * onwards we look at m_qflags to figure out if quotas's ON/OFF, etc.
305 * Note that we enforce nothing if accounting is off.
306 * ie. XFSMNT_*QUOTA must be ON for XFSMNT_*QUOTAENF.
307 * It isn't necessary to take the quotaoff lock to do this; this is
308 * called from mount.
309 */
310 if (flags & XFSMNT_UQUOTA) {
311 mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE);
312 if (flags & XFSMNT_UQUOTAENF)
313 mp->m_qflags |= XFS_UQUOTA_ENFD;
314 }
315 if (flags & XFSMNT_GQUOTA) {
316 mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE);
317 if (flags & XFSMNT_GQUOTAENF)
Nathan Scottc8ad20f2005-06-21 15:38:48 +1000318 mp->m_qflags |= XFS_OQUOTA_ENFD;
319 } else if (flags & XFSMNT_PQUOTA) {
320 mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE);
321 if (flags & XFSMNT_PQUOTAENF)
322 mp->m_qflags |= XFS_OQUOTA_ENFD;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323 }
324}
325
326/*
327 * Just destroy the quotainfo structure.
328 */
329void
330xfs_qm_unmount_quotadestroy(
331 xfs_mount_t *mp)
332{
333 if (mp->m_quotainfo)
334 xfs_qm_destroy_quotainfo(mp);
335}
336
337
338/*
339 * This is called from xfs_mountfs to start quotas and initialize all
340 * necessary data structures like quotainfo. This is also responsible for
341 * running a quotacheck as necessary. We are guaranteed that the superblock
342 * is consistently read in at this point.
343 */
344int
345xfs_qm_mount_quotas(
346 xfs_mount_t *mp,
347 int mfsi_flags)
348{
349 unsigned long s;
350 int error = 0;
351 uint sbf;
352
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353
354 /*
355 * If quotas on realtime volumes is not supported, we disable
356 * quotas immediately.
357 */
358 if (mp->m_sb.sb_rextents) {
359 cmn_err(CE_NOTE,
360 "Cannot turn on quotas for realtime filesystem %s",
361 mp->m_fsname);
362 mp->m_qflags = 0;
363 goto write_changes;
364 }
365
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366 ASSERT(XFS_IS_QUOTA_RUNNING(mp));
Nathan Scott155ffd02005-09-02 16:43:48 +1000367
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368 /*
369 * Allocate the quotainfo structure inside the mount struct, and
370 * create quotainode(s), and change/rev superblock if necessary.
371 */
372 if ((error = xfs_qm_init_quotainfo(mp))) {
373 /*
374 * We must turn off quotas.
375 */
376 ASSERT(mp->m_quotainfo == NULL);
377 mp->m_qflags = 0;
378 goto write_changes;
379 }
380 /*
381 * If any of the quotas are not consistent, do a quotacheck.
382 */
383 if (XFS_QM_NEED_QUOTACHECK(mp) &&
384 !(mfsi_flags & XFS_MFSI_NO_QUOTACHECK)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385 if ((error = xfs_qm_quotacheck(mp))) {
386 /* Quotacheck has failed and quotas have
387 * been disabled.
388 */
389 return XFS_ERROR(error);
390 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391 }
Nathan Scott155ffd02005-09-02 16:43:48 +1000392
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393 write_changes:
394 /*
395 * We actually don't have to acquire the SB_LOCK at all.
396 * This can only be called from mount, and that's single threaded. XXX
397 */
398 s = XFS_SB_LOCK(mp);
399 sbf = mp->m_sb.sb_qflags;
400 mp->m_sb.sb_qflags = mp->m_qflags & XFS_MOUNT_QUOTA_ALL;
401 XFS_SB_UNLOCK(mp, s);
402
403 if (sbf != (mp->m_qflags & XFS_MOUNT_QUOTA_ALL)) {
404 if (xfs_qm_write_sb_changes(mp, XFS_SB_QFLAGS)) {
405 /*
406 * We could only have been turning quotas off.
407 * We aren't in very good shape actually because
408 * the incore structures are convinced that quotas are
409 * off, but the on disk superblock doesn't know that !
410 */
411 ASSERT(!(XFS_IS_QUOTA_RUNNING(mp)));
412 xfs_fs_cmn_err(CE_ALERT, mp,
413 "XFS mount_quotas: Superblock update failed!");
414 }
415 }
416
417 if (error) {
418 xfs_fs_cmn_err(CE_WARN, mp,
419 "Failed to initialize disk quotas.");
420 }
421 return XFS_ERROR(error);
422}
423
424/*
425 * Called from the vfsops layer.
426 */
427int
428xfs_qm_unmount_quotas(
429 xfs_mount_t *mp)
430{
431 xfs_inode_t *uqp, *gqp;
432 int error = 0;
433
434 /*
435 * Release the dquots that root inode, et al might be holding,
436 * before we flush quotas and blow away the quotainfo structure.
437 */
438 ASSERT(mp->m_rootip);
439 xfs_qm_dqdetach(mp->m_rootip);
440 if (mp->m_rbmip)
441 xfs_qm_dqdetach(mp->m_rbmip);
442 if (mp->m_rsumip)
443 xfs_qm_dqdetach(mp->m_rsumip);
444
445 /*
446 * Flush out the quota inodes.
447 */
448 uqp = gqp = NULL;
449 if (mp->m_quotainfo) {
450 if ((uqp = mp->m_quotainfo->qi_uquotaip) != NULL) {
451 xfs_ilock(uqp, XFS_ILOCK_EXCL);
452 xfs_iflock(uqp);
453 error = xfs_iflush(uqp, XFS_IFLUSH_SYNC);
454 xfs_iunlock(uqp, XFS_ILOCK_EXCL);
455 if (unlikely(error == EFSCORRUPTED)) {
456 XFS_ERROR_REPORT("xfs_qm_unmount_quotas(1)",
457 XFS_ERRLEVEL_LOW, mp);
458 goto out;
459 }
460 }
461 if ((gqp = mp->m_quotainfo->qi_gquotaip) != NULL) {
462 xfs_ilock(gqp, XFS_ILOCK_EXCL);
463 xfs_iflock(gqp);
464 error = xfs_iflush(gqp, XFS_IFLUSH_SYNC);
465 xfs_iunlock(gqp, XFS_ILOCK_EXCL);
466 if (unlikely(error == EFSCORRUPTED)) {
467 XFS_ERROR_REPORT("xfs_qm_unmount_quotas(2)",
468 XFS_ERRLEVEL_LOW, mp);
469 goto out;
470 }
471 }
472 }
473 if (uqp) {
474 XFS_PURGE_INODE(uqp);
475 mp->m_quotainfo->qi_uquotaip = NULL;
476 }
477 if (gqp) {
478 XFS_PURGE_INODE(gqp);
479 mp->m_quotainfo->qi_gquotaip = NULL;
480 }
481out:
482 return XFS_ERROR(error);
483}
484
485/*
486 * Flush all dquots of the given file system to disk. The dquots are
487 * _not_ purged from memory here, just their data written to disk.
488 */
Christoph Hellwigba0f32d2005-06-21 15:36:52 +1000489STATIC int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490xfs_qm_dqflush_all(
491 xfs_mount_t *mp,
492 int flags)
493{
494 int recl;
495 xfs_dquot_t *dqp;
496 int niters;
497 int error;
498
499 if (mp->m_quotainfo == NULL)
500 return (0);
501 niters = 0;
502again:
503 xfs_qm_mplist_lock(mp);
504 FOREACH_DQUOT_IN_MP(dqp, mp) {
505 xfs_dqlock(dqp);
506 if (! XFS_DQ_IS_DIRTY(dqp)) {
507 xfs_dqunlock(dqp);
508 continue;
509 }
510 xfs_dqtrace_entry(dqp, "FLUSHALL: DQDIRTY");
511 /* XXX a sentinel would be better */
512 recl = XFS_QI_MPLRECLAIMS(mp);
513 if (! xfs_qm_dqflock_nowait(dqp)) {
514 /*
515 * If we can't grab the flush lock then check
516 * to see if the dquot has been flushed delayed
517 * write. If so, grab its buffer and send it
518 * out immediately. We'll be able to acquire
519 * the flush lock when the I/O completes.
520 */
521 xfs_qm_dqflock_pushbuf_wait(dqp);
522 }
523 /*
524 * Let go of the mplist lock. We don't want to hold it
525 * across a disk write.
526 */
527 xfs_qm_mplist_unlock(mp);
528 error = xfs_qm_dqflush(dqp, flags);
529 xfs_dqunlock(dqp);
530 if (error)
531 return (error);
532
533 xfs_qm_mplist_lock(mp);
534 if (recl != XFS_QI_MPLRECLAIMS(mp)) {
535 xfs_qm_mplist_unlock(mp);
536 /* XXX restart limit */
537 goto again;
538 }
539 }
540
541 xfs_qm_mplist_unlock(mp);
542 /* return ! busy */
543 return (0);
544}
545/*
546 * Release the group dquot pointers the user dquots may be
547 * carrying around as a hint. mplist is locked on entry and exit.
548 */
549STATIC void
550xfs_qm_detach_gdquots(
551 xfs_mount_t *mp)
552{
553 xfs_dquot_t *dqp, *gdqp;
554 int nrecl;
555
556 again:
557 ASSERT(XFS_QM_IS_MPLIST_LOCKED(mp));
558 dqp = XFS_QI_MPLNEXT(mp);
559 while (dqp) {
560 xfs_dqlock(dqp);
561 if ((gdqp = dqp->q_gdquot)) {
562 xfs_dqlock(gdqp);
563 dqp->q_gdquot = NULL;
564 }
565 xfs_dqunlock(dqp);
566
567 if (gdqp) {
568 /*
569 * Can't hold the mplist lock across a dqput.
570 * XXXmust convert to marker based iterations here.
571 */
572 nrecl = XFS_QI_MPLRECLAIMS(mp);
573 xfs_qm_mplist_unlock(mp);
574 xfs_qm_dqput(gdqp);
575
576 xfs_qm_mplist_lock(mp);
577 if (nrecl != XFS_QI_MPLRECLAIMS(mp))
578 goto again;
579 }
580 dqp = dqp->MPL_NEXT;
581 }
582}
583
584/*
585 * Go through all the incore dquots of this file system and take them
586 * off the mplist and hashlist, if the dquot type matches the dqtype
587 * parameter. This is used when turning off quota accounting for
588 * users and/or groups, as well as when the filesystem is unmounting.
589 */
590STATIC int
591xfs_qm_dqpurge_int(
592 xfs_mount_t *mp,
Nathan Scottc8ad20f2005-06-21 15:38:48 +1000593 uint flags) /* QUOTAOFF/UMOUNTING/UQUOTA/PQUOTA/GQUOTA */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594{
595 xfs_dquot_t *dqp;
596 uint dqtype;
597 int nrecl;
598 xfs_dquot_t *nextdqp;
599 int nmisses;
600
601 if (mp->m_quotainfo == NULL)
602 return (0);
603
604 dqtype = (flags & XFS_QMOPT_UQUOTA) ? XFS_DQ_USER : 0;
Nathan Scottc8ad20f2005-06-21 15:38:48 +1000605 dqtype |= (flags & XFS_QMOPT_PQUOTA) ? XFS_DQ_PROJ : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606 dqtype |= (flags & XFS_QMOPT_GQUOTA) ? XFS_DQ_GROUP : 0;
607
608 xfs_qm_mplist_lock(mp);
609
610 /*
611 * In the first pass through all incore dquots of this filesystem,
612 * we release the group dquot pointers the user dquots may be
613 * carrying around as a hint. We need to do this irrespective of
614 * what's being turned off.
615 */
616 xfs_qm_detach_gdquots(mp);
617
618 again:
619 nmisses = 0;
620 ASSERT(XFS_QM_IS_MPLIST_LOCKED(mp));
621 /*
622 * Try to get rid of all of the unwanted dquots. The idea is to
623 * get them off mplist and hashlist, but leave them on freelist.
624 */
625 dqp = XFS_QI_MPLNEXT(mp);
626 while (dqp) {
627 /*
628 * It's OK to look at the type without taking dqlock here.
629 * We're holding the mplist lock here, and that's needed for
630 * a dqreclaim.
631 */
632 if ((dqp->dq_flags & dqtype) == 0) {
633 dqp = dqp->MPL_NEXT;
634 continue;
635 }
636
637 if (! xfs_qm_dqhashlock_nowait(dqp)) {
638 nrecl = XFS_QI_MPLRECLAIMS(mp);
639 xfs_qm_mplist_unlock(mp);
640 XFS_DQ_HASH_LOCK(dqp->q_hash);
641 xfs_qm_mplist_lock(mp);
642
643 /*
644 * XXXTheoretically, we can get into a very long
645 * ping pong game here.
646 * No one can be adding dquots to the mplist at
647 * this point, but somebody might be taking things off.
648 */
649 if (nrecl != XFS_QI_MPLRECLAIMS(mp)) {
650 XFS_DQ_HASH_UNLOCK(dqp->q_hash);
651 goto again;
652 }
653 }
654
655 /*
656 * Take the dquot off the mplist and hashlist. It may remain on
657 * freelist in INACTIVE state.
658 */
659 nextdqp = dqp->MPL_NEXT;
660 nmisses += xfs_qm_dqpurge(dqp, flags);
661 dqp = nextdqp;
662 }
663 xfs_qm_mplist_unlock(mp);
664 return nmisses;
665}
666
667int
668xfs_qm_dqpurge_all(
669 xfs_mount_t *mp,
670 uint flags)
671{
672 int ndquots;
673
674 /*
675 * Purge the dquot cache.
676 * None of the dquots should really be busy at this point.
677 */
678 if (mp->m_quotainfo) {
679 while ((ndquots = xfs_qm_dqpurge_int(mp, flags))) {
680 delay(ndquots * 10);
681 }
682 }
683 return 0;
684}
685
686STATIC int
687xfs_qm_dqattach_one(
688 xfs_inode_t *ip,
689 xfs_dqid_t id,
690 uint type,
691 uint doalloc,
692 uint dolock,
693 xfs_dquot_t *udqhint, /* hint */
694 xfs_dquot_t **IO_idqpp)
695{
696 xfs_dquot_t *dqp;
697 int error;
698
699 ASSERT(XFS_ISLOCKED_INODE_EXCL(ip));
700 error = 0;
701 /*
702 * See if we already have it in the inode itself. IO_idqpp is
703 * &i_udquot or &i_gdquot. This made the code look weird, but
704 * made the logic a lot simpler.
705 */
706 if ((dqp = *IO_idqpp)) {
707 if (dolock)
708 xfs_dqlock(dqp);
709 xfs_dqtrace_entry(dqp, "DQATTACH: found in ip");
710 goto done;
711 }
712
713 /*
714 * udqhint is the i_udquot field in inode, and is non-NULL only
Nathan Scottc8ad20f2005-06-21 15:38:48 +1000715 * when the type arg is group/project. Its purpose is to save a
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716 * lookup by dqid (xfs_qm_dqget) by caching a group dquot inside
717 * the user dquot.
718 */
Nathan Scottc8ad20f2005-06-21 15:38:48 +1000719 ASSERT(!udqhint || type == XFS_DQ_GROUP || type == XFS_DQ_PROJ);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720 if (udqhint && !dolock)
721 xfs_dqlock(udqhint);
722
723 /*
724 * No need to take dqlock to look at the id.
725 * The ID can't change until it gets reclaimed, and it won't
726 * be reclaimed as long as we have a ref from inode and we hold
727 * the ilock.
728 */
729 if (udqhint &&
730 (dqp = udqhint->q_gdquot) &&
Christoph Hellwig1149d962005-11-02 15:01:12 +1100731 (be32_to_cpu(dqp->q_core.d_id) == id)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732 ASSERT(XFS_DQ_IS_LOCKED(udqhint));
733 xfs_dqlock(dqp);
734 XFS_DQHOLD(dqp);
735 ASSERT(*IO_idqpp == NULL);
736 *IO_idqpp = dqp;
737 if (!dolock) {
738 xfs_dqunlock(dqp);
739 xfs_dqunlock(udqhint);
740 }
741 goto done;
742 }
743 /*
744 * We can't hold a dquot lock when we call the dqget code.
745 * We'll deadlock in no time, because of (not conforming to)
746 * lock ordering - the inodelock comes before any dquot lock,
747 * and we may drop and reacquire the ilock in xfs_qm_dqget().
748 */
749 if (udqhint)
750 xfs_dqunlock(udqhint);
751 /*
752 * Find the dquot from somewhere. This bumps the
753 * reference count of dquot and returns it locked.
754 * This can return ENOENT if dquot didn't exist on
755 * disk and we didn't ask it to allocate;
756 * ESRCH if quotas got turned off suddenly.
757 */
758 if ((error = xfs_qm_dqget(ip->i_mount, ip, id, type,
759 doalloc|XFS_QMOPT_DOWARN, &dqp))) {
760 if (udqhint && dolock)
761 xfs_dqlock(udqhint);
762 goto done;
763 }
764
765 xfs_dqtrace_entry(dqp, "DQATTACH: found by dqget");
766 /*
767 * dqget may have dropped and re-acquired the ilock, but it guarantees
768 * that the dquot returned is the one that should go in the inode.
769 */
770 *IO_idqpp = dqp;
771 ASSERT(dqp);
772 ASSERT(XFS_DQ_IS_LOCKED(dqp));
773 if (! dolock) {
774 xfs_dqunlock(dqp);
775 goto done;
776 }
777 if (! udqhint)
778 goto done;
779
780 ASSERT(udqhint);
781 ASSERT(dolock);
782 ASSERT(XFS_DQ_IS_LOCKED(dqp));
783 if (! xfs_qm_dqlock_nowait(udqhint)) {
784 xfs_dqunlock(dqp);
785 xfs_dqlock(udqhint);
786 xfs_dqlock(dqp);
787 }
788 done:
789#ifdef QUOTADEBUG
790 if (udqhint) {
791 if (dolock)
792 ASSERT(XFS_DQ_IS_LOCKED(udqhint));
793 }
794 if (! error) {
795 if (dolock)
796 ASSERT(XFS_DQ_IS_LOCKED(dqp));
797 }
798#endif
799 return (error);
800}
801
802
803/*
804 * Given a udquot and gdquot, attach a ptr to the group dquot in the
805 * udquot as a hint for future lookups. The idea sounds simple, but the
806 * execution isn't, because the udquot might have a group dquot attached
807 * already and getting rid of that gets us into lock ordering contraints.
808 * The process is complicated more by the fact that the dquots may or may not
809 * be locked on entry.
810 */
811STATIC void
812xfs_qm_dqattach_grouphint(
813 xfs_dquot_t *udq,
814 xfs_dquot_t *gdq,
815 uint locked)
816{
817 xfs_dquot_t *tmp;
818
819#ifdef QUOTADEBUG
820 if (locked) {
821 ASSERT(XFS_DQ_IS_LOCKED(udq));
822 ASSERT(XFS_DQ_IS_LOCKED(gdq));
823 }
824#endif
825 if (! locked)
826 xfs_dqlock(udq);
827
828 if ((tmp = udq->q_gdquot)) {
829 if (tmp == gdq) {
830 if (! locked)
831 xfs_dqunlock(udq);
832 return;
833 }
834
835 udq->q_gdquot = NULL;
836 /*
837 * We can't keep any dqlocks when calling dqrele,
838 * because the freelist lock comes before dqlocks.
839 */
840 xfs_dqunlock(udq);
841 if (locked)
842 xfs_dqunlock(gdq);
843 /*
844 * we took a hard reference once upon a time in dqget,
845 * so give it back when the udquot no longer points at it
846 * dqput() does the unlocking of the dquot.
847 */
848 xfs_qm_dqrele(tmp);
849
850 xfs_dqlock(udq);
851 xfs_dqlock(gdq);
852
853 } else {
854 ASSERT(XFS_DQ_IS_LOCKED(udq));
855 if (! locked) {
856 xfs_dqlock(gdq);
857 }
858 }
859
860 ASSERT(XFS_DQ_IS_LOCKED(udq));
861 ASSERT(XFS_DQ_IS_LOCKED(gdq));
862 /*
863 * Somebody could have attached a gdquot here,
864 * when we dropped the uqlock. If so, just do nothing.
865 */
866 if (udq->q_gdquot == NULL) {
867 XFS_DQHOLD(gdq);
868 udq->q_gdquot = gdq;
869 }
870 if (! locked) {
871 xfs_dqunlock(gdq);
872 xfs_dqunlock(udq);
873 }
874}
875
876
877/*
Nathan Scottc8ad20f2005-06-21 15:38:48 +1000878 * Given a locked inode, attach dquot(s) to it, taking U/G/P-QUOTAON
879 * into account.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880 * If XFS_QMOPT_DQALLOC, the dquot(s) will be allocated if needed.
881 * If XFS_QMOPT_DQLOCK, the dquot(s) will be returned locked. This option pretty
882 * much made this code a complete mess, but it has been pretty useful.
883 * If XFS_QMOPT_ILOCKED, then inode sent is already locked EXCL.
884 * Inode may get unlocked and relocked in here, and the caller must deal with
885 * the consequences.
886 */
887int
888xfs_qm_dqattach(
889 xfs_inode_t *ip,
890 uint flags)
891{
892 xfs_mount_t *mp = ip->i_mount;
893 uint nquotas = 0;
894 int error = 0;
895
896 if ((! XFS_IS_QUOTA_ON(mp)) ||
897 (! XFS_NOT_DQATTACHED(mp, ip)) ||
898 (ip->i_ino == mp->m_sb.sb_uquotino) ||
899 (ip->i_ino == mp->m_sb.sb_gquotino))
900 return (0);
901
902 ASSERT((flags & XFS_QMOPT_ILOCKED) == 0 ||
903 XFS_ISLOCKED_INODE_EXCL(ip));
904
905 if (! (flags & XFS_QMOPT_ILOCKED))
906 xfs_ilock(ip, XFS_ILOCK_EXCL);
907
908 if (XFS_IS_UQUOTA_ON(mp)) {
909 error = xfs_qm_dqattach_one(ip, ip->i_d.di_uid, XFS_DQ_USER,
910 flags & XFS_QMOPT_DQALLOC,
911 flags & XFS_QMOPT_DQLOCK,
912 NULL, &ip->i_udquot);
913 if (error)
914 goto done;
915 nquotas++;
916 }
917 ASSERT(XFS_ISLOCKED_INODE_EXCL(ip));
Nathan Scottc8ad20f2005-06-21 15:38:48 +1000918 if (XFS_IS_OQUOTA_ON(mp)) {
919 error = XFS_IS_GQUOTA_ON(mp) ?
920 xfs_qm_dqattach_one(ip, ip->i_d.di_gid, XFS_DQ_GROUP,
921 flags & XFS_QMOPT_DQALLOC,
922 flags & XFS_QMOPT_DQLOCK,
923 ip->i_udquot, &ip->i_gdquot) :
924 xfs_qm_dqattach_one(ip, ip->i_d.di_projid, XFS_DQ_PROJ,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700925 flags & XFS_QMOPT_DQALLOC,
926 flags & XFS_QMOPT_DQLOCK,
927 ip->i_udquot, &ip->i_gdquot);
928 /*
929 * Don't worry about the udquot that we may have
930 * attached above. It'll get detached, if not already.
931 */
932 if (error)
933 goto done;
934 nquotas++;
935 }
936
937 /*
938 * Attach this group quota to the user quota as a hint.
939 * This WON'T, in general, result in a thrash.
940 */
941 if (nquotas == 2) {
942 ASSERT(XFS_ISLOCKED_INODE_EXCL(ip));
943 ASSERT(ip->i_udquot);
944 ASSERT(ip->i_gdquot);
945
946 /*
947 * We may or may not have the i_udquot locked at this point,
948 * but this check is OK since we don't depend on the i_gdquot to
949 * be accurate 100% all the time. It is just a hint, and this
950 * will succeed in general.
951 */
952 if (ip->i_udquot->q_gdquot == ip->i_gdquot)
953 goto done;
954 /*
955 * Attach i_gdquot to the gdquot hint inside the i_udquot.
956 */
957 xfs_qm_dqattach_grouphint(ip->i_udquot, ip->i_gdquot,
958 flags & XFS_QMOPT_DQLOCK);
959 }
960
961 done:
962
963#ifdef QUOTADEBUG
964 if (! error) {
965 if (ip->i_udquot) {
966 if (flags & XFS_QMOPT_DQLOCK)
967 ASSERT(XFS_DQ_IS_LOCKED(ip->i_udquot));
968 }
969 if (ip->i_gdquot) {
970 if (flags & XFS_QMOPT_DQLOCK)
971 ASSERT(XFS_DQ_IS_LOCKED(ip->i_gdquot));
972 }
973 if (XFS_IS_UQUOTA_ON(mp))
974 ASSERT(ip->i_udquot);
Nathan Scottc8ad20f2005-06-21 15:38:48 +1000975 if (XFS_IS_OQUOTA_ON(mp))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976 ASSERT(ip->i_gdquot);
977 }
978#endif
979
980 if (! (flags & XFS_QMOPT_ILOCKED))
981 xfs_iunlock(ip, XFS_ILOCK_EXCL);
982
983#ifdef QUOTADEBUG
984 else
985 ASSERT(XFS_ISLOCKED_INODE_EXCL(ip));
986#endif
987 return (error);
988}
989
990/*
991 * Release dquots (and their references) if any.
992 * The inode should be locked EXCL except when this's called by
993 * xfs_ireclaim.
994 */
995void
996xfs_qm_dqdetach(
997 xfs_inode_t *ip)
998{
999 if (!(ip->i_udquot || ip->i_gdquot))
1000 return;
1001
1002 ASSERT(ip->i_ino != ip->i_mount->m_sb.sb_uquotino);
1003 ASSERT(ip->i_ino != ip->i_mount->m_sb.sb_gquotino);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001004 if (ip->i_udquot) {
Nathan Scottc8ad20f2005-06-21 15:38:48 +10001005 xfs_dqtrace_entry_ino(ip->i_udquot, "DQDETTACH", ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001006 xfs_qm_dqrele(ip->i_udquot);
1007 ip->i_udquot = NULL;
1008 }
1009 if (ip->i_gdquot) {
Nathan Scottc8ad20f2005-06-21 15:38:48 +10001010 xfs_dqtrace_entry_ino(ip->i_gdquot, "DQDETTACH", ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001011 xfs_qm_dqrele(ip->i_gdquot);
1012 ip->i_gdquot = NULL;
1013 }
1014}
1015
1016/*
1017 * This is called by VFS_SYNC and flags arg determines the caller,
1018 * and its motives, as done in xfs_sync.
1019 *
1020 * vfs_sync: SYNC_FSDATA|SYNC_ATTR|SYNC_BDFLUSH 0x31
1021 * syscall sync: SYNC_FSDATA|SYNC_ATTR|SYNC_DELWRI 0x25
1022 * umountroot : SYNC_WAIT | SYNC_CLOSE | SYNC_ATTR | SYNC_FSDATA
1023 */
1024
1025int
1026xfs_qm_sync(
1027 xfs_mount_t *mp,
1028 short flags)
1029{
1030 int recl, restarts;
1031 xfs_dquot_t *dqp;
1032 uint flush_flags;
1033 boolean_t nowait;
1034 int error;
1035
1036 restarts = 0;
1037 /*
1038 * We won't block unless we are asked to.
1039 */
1040 nowait = (boolean_t)(flags & SYNC_BDFLUSH || (flags & SYNC_WAIT) == 0);
1041
1042 again:
1043 xfs_qm_mplist_lock(mp);
1044 /*
1045 * dqpurge_all() also takes the mplist lock and iterate thru all dquots
1046 * in quotaoff. However, if the QUOTA_ACTIVE bits are not cleared
1047 * when we have the mplist lock, we know that dquots will be consistent
1048 * as long as we have it locked.
1049 */
1050 if (! XFS_IS_QUOTA_ON(mp)) {
1051 xfs_qm_mplist_unlock(mp);
1052 return (0);
1053 }
1054 FOREACH_DQUOT_IN_MP(dqp, mp) {
1055 /*
1056 * If this is vfs_sync calling, then skip the dquots that
1057 * don't 'seem' to be dirty. ie. don't acquire dqlock.
1058 * This is very similar to what xfs_sync does with inodes.
1059 */
1060 if (flags & SYNC_BDFLUSH) {
1061 if (! XFS_DQ_IS_DIRTY(dqp))
1062 continue;
1063 }
1064
1065 if (nowait) {
1066 /*
1067 * Try to acquire the dquot lock. We are NOT out of
1068 * lock order, but we just don't want to wait for this
1069 * lock, unless somebody wanted us to.
1070 */
1071 if (! xfs_qm_dqlock_nowait(dqp))
1072 continue;
1073 } else {
1074 xfs_dqlock(dqp);
1075 }
1076
1077 /*
1078 * Now, find out for sure if this dquot is dirty or not.
1079 */
1080 if (! XFS_DQ_IS_DIRTY(dqp)) {
1081 xfs_dqunlock(dqp);
1082 continue;
1083 }
1084
1085 /* XXX a sentinel would be better */
1086 recl = XFS_QI_MPLRECLAIMS(mp);
1087 if (! xfs_qm_dqflock_nowait(dqp)) {
1088 if (nowait) {
1089 xfs_dqunlock(dqp);
1090 continue;
1091 }
1092 /*
1093 * If we can't grab the flush lock then if the caller
1094 * really wanted us to give this our best shot,
1095 * see if we can give a push to the buffer before we wait
1096 * on the flush lock. At this point, we know that
1097 * eventhough the dquot is being flushed,
1098 * it has (new) dirty data.
1099 */
1100 xfs_qm_dqflock_pushbuf_wait(dqp);
1101 }
1102 /*
1103 * Let go of the mplist lock. We don't want to hold it
1104 * across a disk write
1105 */
1106 flush_flags = (nowait) ? XFS_QMOPT_DELWRI : XFS_QMOPT_SYNC;
1107 xfs_qm_mplist_unlock(mp);
1108 xfs_dqtrace_entry(dqp, "XQM_SYNC: DQFLUSH");
1109 error = xfs_qm_dqflush(dqp, flush_flags);
1110 xfs_dqunlock(dqp);
1111 if (error && XFS_FORCED_SHUTDOWN(mp))
1112 return(0); /* Need to prevent umount failure */
1113 else if (error)
1114 return (error);
1115
1116 xfs_qm_mplist_lock(mp);
1117 if (recl != XFS_QI_MPLRECLAIMS(mp)) {
1118 if (++restarts >= XFS_QM_SYNC_MAX_RESTARTS)
1119 break;
1120
1121 xfs_qm_mplist_unlock(mp);
1122 goto again;
1123 }
1124 }
1125
1126 xfs_qm_mplist_unlock(mp);
1127 return (0);
1128}
1129
1130
1131/*
1132 * This initializes all the quota information that's kept in the
1133 * mount structure
1134 */
Christoph Hellwigba0f32d2005-06-21 15:36:52 +10001135STATIC int
Linus Torvalds1da177e2005-04-16 15:20:36 -07001136xfs_qm_init_quotainfo(
1137 xfs_mount_t *mp)
1138{
1139 xfs_quotainfo_t *qinf;
1140 int error;
1141 xfs_dquot_t *dqp;
1142
1143 ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1144
1145 /*
1146 * Tell XQM that we exist as soon as possible.
1147 */
1148 if ((error = xfs_qm_hold_quotafs_ref(mp))) {
1149 return (error);
1150 }
1151
1152 qinf = mp->m_quotainfo = kmem_zalloc(sizeof(xfs_quotainfo_t), KM_SLEEP);
1153
1154 /*
1155 * See if quotainodes are setup, and if not, allocate them,
1156 * and change the superblock accordingly.
1157 */
1158 if ((error = xfs_qm_init_quotainos(mp))) {
1159 kmem_free(qinf, sizeof(xfs_quotainfo_t));
1160 mp->m_quotainfo = NULL;
1161 return (error);
1162 }
1163
1164 spinlock_init(&qinf->qi_pinlock, "xfs_qinf_pin");
1165 xfs_qm_list_init(&qinf->qi_dqlist, "mpdqlist", 0);
1166 qinf->qi_dqreclaims = 0;
1167
1168 /* mutex used to serialize quotaoffs */
Jes Sorensen794ee1b2006-01-09 15:59:21 -08001169 mutex_init(&qinf->qi_quotaofflock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001170
1171 /* Precalc some constants */
1172 qinf->qi_dqchunklen = XFS_FSB_TO_BB(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
1173 ASSERT(qinf->qi_dqchunklen);
1174 qinf->qi_dqperchunk = BBTOB(qinf->qi_dqchunklen);
1175 do_div(qinf->qi_dqperchunk, sizeof(xfs_dqblk_t));
1176
1177 mp->m_qflags |= (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_CHKD);
1178
1179 /*
1180 * We try to get the limits from the superuser's limits fields.
1181 * This is quite hacky, but it is standard quota practice.
1182 * We look at the USR dquot with id == 0 first, but if user quotas
1183 * are not enabled we goto the GRP dquot with id == 0.
1184 * We don't really care to keep separate default limits for user
1185 * and group quotas, at least not at this point.
1186 */
1187 error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t)0,
Nathan Scottc8ad20f2005-06-21 15:38:48 +10001188 XFS_IS_UQUOTA_RUNNING(mp) ? XFS_DQ_USER :
1189 (XFS_IS_GQUOTA_RUNNING(mp) ? XFS_DQ_GROUP :
1190 XFS_DQ_PROJ),
Linus Torvalds1da177e2005-04-16 15:20:36 -07001191 XFS_QMOPT_DQSUSER|XFS_QMOPT_DOWARN,
1192 &dqp);
1193 if (! error) {
1194 xfs_disk_dquot_t *ddqp = &dqp->q_core;
1195
1196 /*
1197 * The warnings and timers set the grace period given to
1198 * a user or group before he or she can not perform any
1199 * more writing. If it is zero, a default is used.
1200 */
Christoph Hellwig1149d962005-11-02 15:01:12 +11001201 qinf->qi_btimelimit = ddqp->d_btimer ?
1202 be32_to_cpu(ddqp->d_btimer) : XFS_QM_BTIMELIMIT;
1203 qinf->qi_itimelimit = ddqp->d_itimer ?
1204 be32_to_cpu(ddqp->d_itimer) : XFS_QM_ITIMELIMIT;
1205 qinf->qi_rtbtimelimit = ddqp->d_rtbtimer ?
1206 be32_to_cpu(ddqp->d_rtbtimer) : XFS_QM_RTBTIMELIMIT;
1207 qinf->qi_bwarnlimit = ddqp->d_bwarns ?
1208 be16_to_cpu(ddqp->d_bwarns) : XFS_QM_BWARNLIMIT;
1209 qinf->qi_iwarnlimit = ddqp->d_iwarns ?
1210 be16_to_cpu(ddqp->d_iwarns) : XFS_QM_IWARNLIMIT;
1211 qinf->qi_rtbwarnlimit = ddqp->d_rtbwarns ?
1212 be16_to_cpu(ddqp->d_rtbwarns) : XFS_QM_RTBWARNLIMIT;
1213 qinf->qi_bhardlimit = be64_to_cpu(ddqp->d_blk_hardlimit);
1214 qinf->qi_bsoftlimit = be64_to_cpu(ddqp->d_blk_softlimit);
1215 qinf->qi_ihardlimit = be64_to_cpu(ddqp->d_ino_hardlimit);
1216 qinf->qi_isoftlimit = be64_to_cpu(ddqp->d_ino_softlimit);
1217 qinf->qi_rtbhardlimit = be64_to_cpu(ddqp->d_rtb_hardlimit);
1218 qinf->qi_rtbsoftlimit = be64_to_cpu(ddqp->d_rtb_softlimit);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001219
1220 /*
1221 * We sent the XFS_QMOPT_DQSUSER flag to dqget because
1222 * we don't want this dquot cached. We haven't done a
1223 * quotacheck yet, and quotacheck doesn't like incore dquots.
1224 */
1225 xfs_qm_dqdestroy(dqp);
1226 } else {
1227 qinf->qi_btimelimit = XFS_QM_BTIMELIMIT;
1228 qinf->qi_itimelimit = XFS_QM_ITIMELIMIT;
1229 qinf->qi_rtbtimelimit = XFS_QM_RTBTIMELIMIT;
1230 qinf->qi_bwarnlimit = XFS_QM_BWARNLIMIT;
1231 qinf->qi_iwarnlimit = XFS_QM_IWARNLIMIT;
Nathan Scott06d10dd2005-06-21 15:48:47 +10001232 qinf->qi_rtbwarnlimit = XFS_QM_RTBWARNLIMIT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001233 }
1234
1235 return (0);
1236}
1237
1238
1239/*
1240 * Gets called when unmounting a filesystem or when all quotas get
1241 * turned off.
1242 * This purges the quota inodes, destroys locks and frees itself.
1243 */
1244void
1245xfs_qm_destroy_quotainfo(
1246 xfs_mount_t *mp)
1247{
1248 xfs_quotainfo_t *qi;
1249
1250 qi = mp->m_quotainfo;
1251 ASSERT(qi != NULL);
1252 ASSERT(xfs_Gqm != NULL);
1253
1254 /*
1255 * Release the reference that XQM kept, so that we know
1256 * when the XQM structure should be freed. We cannot assume
1257 * that xfs_Gqm is non-null after this point.
1258 */
1259 xfs_qm_rele_quotafs_ref(mp);
1260
1261 spinlock_destroy(&qi->qi_pinlock);
1262 xfs_qm_list_destroy(&qi->qi_dqlist);
1263
1264 if (qi->qi_uquotaip) {
1265 XFS_PURGE_INODE(qi->qi_uquotaip);
1266 qi->qi_uquotaip = NULL; /* paranoia */
1267 }
1268 if (qi->qi_gquotaip) {
1269 XFS_PURGE_INODE(qi->qi_gquotaip);
1270 qi->qi_gquotaip = NULL;
1271 }
1272 mutex_destroy(&qi->qi_quotaofflock);
1273 kmem_free(qi, sizeof(xfs_quotainfo_t));
1274 mp->m_quotainfo = NULL;
1275}
1276
1277
1278
1279/* ------------------- PRIVATE STATIC FUNCTIONS ----------------------- */
1280
1281/* ARGSUSED */
1282STATIC void
1283xfs_qm_list_init(
1284 xfs_dqlist_t *list,
1285 char *str,
1286 int n)
1287{
Jes Sorensen794ee1b2006-01-09 15:59:21 -08001288 mutex_init(&list->qh_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001289 list->qh_next = NULL;
1290 list->qh_version = 0;
1291 list->qh_nelems = 0;
1292}
1293
1294STATIC void
1295xfs_qm_list_destroy(
1296 xfs_dqlist_t *list)
1297{
1298 mutex_destroy(&(list->qh_lock));
1299}
1300
1301
1302/*
1303 * Stripped down version of dqattach. This doesn't attach, or even look at the
1304 * dquots attached to the inode. The rationale is that there won't be any
1305 * attached at the time this is called from quotacheck.
1306 */
1307STATIC int
1308xfs_qm_dqget_noattach(
1309 xfs_inode_t *ip,
1310 xfs_dquot_t **O_udqpp,
1311 xfs_dquot_t **O_gdqpp)
1312{
1313 int error;
1314 xfs_mount_t *mp;
1315 xfs_dquot_t *udqp, *gdqp;
1316
1317 ASSERT(XFS_ISLOCKED_INODE_EXCL(ip));
1318 mp = ip->i_mount;
1319 udqp = NULL;
1320 gdqp = NULL;
1321
1322 if (XFS_IS_UQUOTA_ON(mp)) {
1323 ASSERT(ip->i_udquot == NULL);
1324 /*
1325 * We want the dquot allocated if it doesn't exist.
1326 */
1327 if ((error = xfs_qm_dqget(mp, ip, ip->i_d.di_uid, XFS_DQ_USER,
1328 XFS_QMOPT_DQALLOC | XFS_QMOPT_DOWARN,
1329 &udqp))) {
1330 /*
1331 * Shouldn't be able to turn off quotas here.
1332 */
1333 ASSERT(error != ESRCH);
1334 ASSERT(error != ENOENT);
1335 return (error);
1336 }
1337 ASSERT(udqp);
1338 }
1339
Nathan Scottc8ad20f2005-06-21 15:38:48 +10001340 if (XFS_IS_OQUOTA_ON(mp)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001341 ASSERT(ip->i_gdquot == NULL);
1342 if (udqp)
1343 xfs_dqunlock(udqp);
Nathan Scottc8ad20f2005-06-21 15:38:48 +10001344 error = XFS_IS_GQUOTA_ON(mp) ?
1345 xfs_qm_dqget(mp, ip,
1346 ip->i_d.di_gid, XFS_DQ_GROUP,
1347 XFS_QMOPT_DQALLOC|XFS_QMOPT_DOWARN,
1348 &gdqp) :
1349 xfs_qm_dqget(mp, ip,
1350 ip->i_d.di_projid, XFS_DQ_PROJ,
1351 XFS_QMOPT_DQALLOC|XFS_QMOPT_DOWARN,
1352 &gdqp);
1353 if (error) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001354 if (udqp)
1355 xfs_qm_dqrele(udqp);
1356 ASSERT(error != ESRCH);
1357 ASSERT(error != ENOENT);
1358 return (error);
1359 }
1360 ASSERT(gdqp);
1361
1362 /* Reacquire the locks in the right order */
1363 if (udqp) {
1364 if (! xfs_qm_dqlock_nowait(udqp)) {
1365 xfs_dqunlock(gdqp);
1366 xfs_dqlock(udqp);
1367 xfs_dqlock(gdqp);
1368 }
1369 }
1370 }
1371
1372 *O_udqpp = udqp;
1373 *O_gdqpp = gdqp;
1374
1375#ifdef QUOTADEBUG
1376 if (udqp) ASSERT(XFS_DQ_IS_LOCKED(udqp));
1377 if (gdqp) ASSERT(XFS_DQ_IS_LOCKED(gdqp));
1378#endif
1379 return (0);
1380}
1381
1382/*
1383 * Create an inode and return with a reference already taken, but unlocked
1384 * This is how we create quota inodes
1385 */
1386STATIC int
1387xfs_qm_qino_alloc(
1388 xfs_mount_t *mp,
1389 xfs_inode_t **ip,
1390 __int64_t sbfields,
1391 uint flags)
1392{
1393 xfs_trans_t *tp;
1394 int error;
Nathan Scott061f7202006-01-11 15:27:50 +11001395 unsigned long s;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001396 cred_t zerocr;
Nathan Scott061f7202006-01-11 15:27:50 +11001397 xfs_inode_t zeroino;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001398 int committed;
1399
Nathan Scott061f7202006-01-11 15:27:50 +11001400 tp = xfs_trans_alloc(mp, XFS_TRANS_QM_QINOCREATE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001401 if ((error = xfs_trans_reserve(tp,
1402 XFS_QM_QINOCREATE_SPACE_RES(mp),
1403 XFS_CREATE_LOG_RES(mp), 0,
1404 XFS_TRANS_PERM_LOG_RES,
1405 XFS_CREATE_LOG_COUNT))) {
1406 xfs_trans_cancel(tp, 0);
1407 return (error);
1408 }
1409 memset(&zerocr, 0, sizeof(zerocr));
Nathan Scott061f7202006-01-11 15:27:50 +11001410 memset(&zeroino, 0, sizeof(zeroino));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001411
Nathan Scott061f7202006-01-11 15:27:50 +11001412 if ((error = xfs_dir_ialloc(&tp, &zeroino, S_IFREG, 1, 0,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001413 &zerocr, 0, 1, ip, &committed))) {
1414 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES |
1415 XFS_TRANS_ABORT);
1416 return (error);
1417 }
1418
1419 /*
1420 * Keep an extra reference to this quota inode. This inode is
1421 * locked exclusively and joined to the transaction already.
1422 */
1423 ASSERT(XFS_ISLOCKED_INODE_EXCL(*ip));
1424 VN_HOLD(XFS_ITOV((*ip)));
1425
1426 /*
1427 * Make the changes in the superblock, and log those too.
1428 * sbfields arg may contain fields other than *QUOTINO;
1429 * VERSIONNUM for example.
1430 */
1431 s = XFS_SB_LOCK(mp);
1432 if (flags & XFS_QMOPT_SBVERSION) {
1433#if defined(DEBUG) && defined(XFS_LOUD_RECOVERY)
1434 unsigned oldv = mp->m_sb.sb_versionnum;
1435#endif
1436 ASSERT(!XFS_SB_VERSION_HASQUOTA(&mp->m_sb));
1437 ASSERT((sbfields & (XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
1438 XFS_SB_GQUOTINO | XFS_SB_QFLAGS)) ==
1439 (XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
1440 XFS_SB_GQUOTINO | XFS_SB_QFLAGS));
1441
1442 XFS_SB_VERSION_ADDQUOTA(&mp->m_sb);
1443 mp->m_sb.sb_uquotino = NULLFSINO;
1444 mp->m_sb.sb_gquotino = NULLFSINO;
1445
1446 /* qflags will get updated _after_ quotacheck */
1447 mp->m_sb.sb_qflags = 0;
1448#if defined(DEBUG) && defined(XFS_LOUD_RECOVERY)
1449 cmn_err(CE_NOTE,
1450 "Old superblock version %x, converting to %x.",
1451 oldv, mp->m_sb.sb_versionnum);
1452#endif
1453 }
1454 if (flags & XFS_QMOPT_UQUOTA)
1455 mp->m_sb.sb_uquotino = (*ip)->i_ino;
1456 else
1457 mp->m_sb.sb_gquotino = (*ip)->i_ino;
1458 XFS_SB_UNLOCK(mp, s);
1459 xfs_mod_sb(tp, sbfields);
1460
1461 if ((error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES,
1462 NULL))) {
1463 xfs_fs_cmn_err(CE_ALERT, mp, "XFS qino_alloc failed!");
1464 return (error);
1465 }
1466 return (0);
1467}
1468
1469
1470STATIC int
1471xfs_qm_reset_dqcounts(
1472 xfs_mount_t *mp,
1473 xfs_buf_t *bp,
1474 xfs_dqid_t id,
1475 uint type)
1476{
1477 xfs_disk_dquot_t *ddq;
1478 int j;
1479
1480 xfs_buftrace("RESET DQUOTS", bp);
1481 /*
1482 * Reset all counters and timers. They'll be
1483 * started afresh by xfs_qm_quotacheck.
1484 */
1485#ifdef DEBUG
1486 j = XFS_FSB_TO_B(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
1487 do_div(j, sizeof(xfs_dqblk_t));
1488 ASSERT(XFS_QM_DQPERBLK(mp) == j);
1489#endif
1490 ddq = (xfs_disk_dquot_t *)XFS_BUF_PTR(bp);
1491 for (j = 0; j < XFS_QM_DQPERBLK(mp); j++) {
1492 /*
1493 * Do a sanity check, and if needed, repair the dqblk. Don't
1494 * output any warnings because it's perfectly possible to
1495 * find unitialized dquot blks. See comment in xfs_qm_dqcheck.
1496 */
1497 (void) xfs_qm_dqcheck(ddq, id+j, type, XFS_QMOPT_DQREPAIR,
1498 "xfs_quotacheck");
Christoph Hellwig1149d962005-11-02 15:01:12 +11001499 ddq->d_bcount = 0;
1500 ddq->d_icount = 0;
1501 ddq->d_rtbcount = 0;
1502 ddq->d_btimer = 0;
1503 ddq->d_itimer = 0;
1504 ddq->d_rtbtimer = 0;
1505 ddq->d_bwarns = 0;
1506 ddq->d_iwarns = 0;
1507 ddq->d_rtbwarns = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001508 ddq = (xfs_disk_dquot_t *) ((xfs_dqblk_t *)ddq + 1);
1509 }
1510
1511 return (0);
1512}
1513
1514STATIC int
1515xfs_qm_dqiter_bufs(
1516 xfs_mount_t *mp,
1517 xfs_dqid_t firstid,
1518 xfs_fsblock_t bno,
1519 xfs_filblks_t blkcnt,
1520 uint flags)
1521{
1522 xfs_buf_t *bp;
1523 int error;
1524 int notcommitted;
1525 int incr;
Nathan Scottc8ad20f2005-06-21 15:38:48 +10001526 int type;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001527
1528 ASSERT(blkcnt > 0);
1529 notcommitted = 0;
1530 incr = (blkcnt > XFS_QM_MAX_DQCLUSTER_LOGSZ) ?
1531 XFS_QM_MAX_DQCLUSTER_LOGSZ : blkcnt;
Nathan Scottc8ad20f2005-06-21 15:38:48 +10001532 type = flags & XFS_QMOPT_UQUOTA ? XFS_DQ_USER :
1533 (flags & XFS_QMOPT_PQUOTA ? XFS_DQ_PROJ : XFS_DQ_GROUP);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001534 error = 0;
1535
1536 /*
1537 * Blkcnt arg can be a very big number, and might even be
1538 * larger than the log itself. So, we have to break it up into
1539 * manageable-sized transactions.
1540 * Note that we don't start a permanent transaction here; we might
1541 * not be able to get a log reservation for the whole thing up front,
1542 * and we don't really care to either, because we just discard
1543 * everything if we were to crash in the middle of this loop.
1544 */
1545 while (blkcnt--) {
1546 error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
1547 XFS_FSB_TO_DADDR(mp, bno),
1548 (int)XFS_QI_DQCHUNKLEN(mp), 0, &bp);
1549 if (error)
1550 break;
1551
Nathan Scottc8ad20f2005-06-21 15:38:48 +10001552 (void) xfs_qm_reset_dqcounts(mp, bp, firstid, type);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001553 xfs_bdwrite(mp, bp);
1554 /*
1555 * goto the next block.
1556 */
1557 bno++;
1558 firstid += XFS_QM_DQPERBLK(mp);
1559 }
1560 return (error);
1561}
1562
1563/*
Nathan Scottc8ad20f2005-06-21 15:38:48 +10001564 * Iterate over all allocated USR/GRP/PRJ dquots in the system, calling a
Linus Torvalds1da177e2005-04-16 15:20:36 -07001565 * caller supplied function for every chunk of dquots that we find.
1566 */
1567STATIC int
1568xfs_qm_dqiterate(
1569 xfs_mount_t *mp,
1570 xfs_inode_t *qip,
1571 uint flags)
1572{
1573 xfs_bmbt_irec_t *map;
1574 int i, nmaps; /* number of map entries */
1575 int error; /* return value */
1576 xfs_fileoff_t lblkno;
1577 xfs_filblks_t maxlblkcnt;
1578 xfs_dqid_t firstid;
1579 xfs_fsblock_t rablkno;
1580 xfs_filblks_t rablkcnt;
1581
1582 error = 0;
1583 /*
1584 * This looks racey, but we can't keep an inode lock across a
1585 * trans_reserve. But, this gets called during quotacheck, and that
1586 * happens only at mount time which is single threaded.
1587 */
1588 if (qip->i_d.di_nblocks == 0)
1589 return (0);
1590
1591 map = kmem_alloc(XFS_DQITER_MAP_SIZE * sizeof(*map), KM_SLEEP);
1592
1593 lblkno = 0;
1594 maxlblkcnt = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_MAXIOFFSET(mp));
1595 do {
1596 nmaps = XFS_DQITER_MAP_SIZE;
1597 /*
1598 * We aren't changing the inode itself. Just changing
1599 * some of its data. No new blocks are added here, and
1600 * the inode is never added to the transaction.
1601 */
1602 xfs_ilock(qip, XFS_ILOCK_SHARED);
1603 error = xfs_bmapi(NULL, qip, lblkno,
1604 maxlblkcnt - lblkno,
1605 XFS_BMAPI_METADATA,
1606 NULL,
1607 0, map, &nmaps, NULL);
1608 xfs_iunlock(qip, XFS_ILOCK_SHARED);
1609 if (error)
1610 break;
1611
1612 ASSERT(nmaps <= XFS_DQITER_MAP_SIZE);
1613 for (i = 0; i < nmaps; i++) {
1614 ASSERT(map[i].br_startblock != DELAYSTARTBLOCK);
1615 ASSERT(map[i].br_blockcount);
1616
1617
1618 lblkno += map[i].br_blockcount;
1619
1620 if (map[i].br_startblock == HOLESTARTBLOCK)
1621 continue;
1622
1623 firstid = (xfs_dqid_t) map[i].br_startoff *
1624 XFS_QM_DQPERBLK(mp);
1625 /*
1626 * Do a read-ahead on the next extent.
1627 */
1628 if ((i+1 < nmaps) &&
1629 (map[i+1].br_startblock != HOLESTARTBLOCK)) {
1630 rablkcnt = map[i+1].br_blockcount;
1631 rablkno = map[i+1].br_startblock;
1632 while (rablkcnt--) {
1633 xfs_baread(mp->m_ddev_targp,
1634 XFS_FSB_TO_DADDR(mp, rablkno),
1635 (int)XFS_QI_DQCHUNKLEN(mp));
1636 rablkno++;
1637 }
1638 }
1639 /*
1640 * Iterate thru all the blks in the extent and
1641 * reset the counters of all the dquots inside them.
1642 */
1643 if ((error = xfs_qm_dqiter_bufs(mp,
1644 firstid,
1645 map[i].br_startblock,
1646 map[i].br_blockcount,
1647 flags))) {
1648 break;
1649 }
1650 }
1651
1652 if (error)
1653 break;
1654 } while (nmaps > 0);
1655
1656 kmem_free(map, XFS_DQITER_MAP_SIZE * sizeof(*map));
1657
1658 return (error);
1659}
1660
1661/*
1662 * Called by dqusage_adjust in doing a quotacheck.
1663 * Given the inode, and a dquot (either USR or GRP, doesn't matter),
1664 * this updates its incore copy as well as the buffer copy. This is
1665 * so that once the quotacheck is done, we can just log all the buffers,
1666 * as opposed to logging numerous updates to individual dquots.
1667 */
1668STATIC void
1669xfs_qm_quotacheck_dqadjust(
1670 xfs_dquot_t *dqp,
1671 xfs_qcnt_t nblks,
1672 xfs_qcnt_t rtblks)
1673{
1674 ASSERT(XFS_DQ_IS_LOCKED(dqp));
1675 xfs_dqtrace_entry(dqp, "QCHECK DQADJUST");
1676 /*
1677 * Adjust the inode count and the block count to reflect this inode's
1678 * resource usage.
1679 */
Christoph Hellwig1149d962005-11-02 15:01:12 +11001680 be64_add(&dqp->q_core.d_icount, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001681 dqp->q_res_icount++;
1682 if (nblks) {
Christoph Hellwig1149d962005-11-02 15:01:12 +11001683 be64_add(&dqp->q_core.d_bcount, nblks);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001684 dqp->q_res_bcount += nblks;
1685 }
1686 if (rtblks) {
Christoph Hellwig1149d962005-11-02 15:01:12 +11001687 be64_add(&dqp->q_core.d_rtbcount, rtblks);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001688 dqp->q_res_rtbcount += rtblks;
1689 }
1690
1691 /*
1692 * Set default limits, adjust timers (since we changed usages)
1693 */
1694 if (! XFS_IS_SUSER_DQUOT(dqp)) {
1695 xfs_qm_adjust_dqlimits(dqp->q_mount, &dqp->q_core);
1696 xfs_qm_adjust_dqtimers(dqp->q_mount, &dqp->q_core);
1697 }
1698
1699 dqp->dq_flags |= XFS_DQ_DIRTY;
1700}
1701
1702STATIC int
1703xfs_qm_get_rtblks(
1704 xfs_inode_t *ip,
1705 xfs_qcnt_t *O_rtblks)
1706{
1707 xfs_filblks_t rtblks; /* total rt blks */
1708 xfs_ifork_t *ifp; /* inode fork pointer */
1709 xfs_extnum_t nextents; /* number of extent entries */
1710 xfs_bmbt_rec_t *base; /* base of extent array */
1711 xfs_bmbt_rec_t *ep; /* pointer to an extent entry */
1712 int error;
1713
1714 ASSERT(XFS_IS_REALTIME_INODE(ip));
1715 ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
1716 if (!(ifp->if_flags & XFS_IFEXTENTS)) {
1717 if ((error = xfs_iread_extents(NULL, ip, XFS_DATA_FORK)))
1718 return (error);
1719 }
1720 rtblks = 0;
1721 nextents = ifp->if_bytes / sizeof(xfs_bmbt_rec_t);
1722 base = &ifp->if_u1.if_extents[0];
1723 for (ep = base; ep < &base[nextents]; ep++)
1724 rtblks += xfs_bmbt_get_blockcount(ep);
1725 *O_rtblks = (xfs_qcnt_t)rtblks;
1726 return (0);
1727}
1728
1729/*
1730 * callback routine supplied to bulkstat(). Given an inumber, find its
1731 * dquots and update them to account for resources taken by that inode.
1732 */
1733/* ARGSUSED */
1734STATIC int
1735xfs_qm_dqusage_adjust(
1736 xfs_mount_t *mp, /* mount point for filesystem */
1737 xfs_ino_t ino, /* inode number to get data for */
1738 void __user *buffer, /* not used */
1739 int ubsize, /* not used */
1740 void *private_data, /* not used */
1741 xfs_daddr_t bno, /* starting block of inode cluster */
1742 int *ubused, /* not used */
1743 void *dip, /* on-disk inode pointer (not used) */
1744 int *res) /* result code value */
1745{
1746 xfs_inode_t *ip;
1747 xfs_dquot_t *udqp, *gdqp;
1748 xfs_qcnt_t nblks, rtblks;
1749 int error;
1750
1751 ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1752
1753 /*
1754 * rootino must have its resources accounted for, not so with the quota
1755 * inodes.
1756 */
1757 if (ino == mp->m_sb.sb_uquotino || ino == mp->m_sb.sb_gquotino) {
1758 *res = BULKSTAT_RV_NOTHING;
1759 return XFS_ERROR(EINVAL);
1760 }
1761
1762 /*
1763 * We don't _need_ to take the ilock EXCL. However, the xfs_qm_dqget
1764 * interface expects the inode to be exclusively locked because that's
1765 * the case in all other instances. It's OK that we do this because
1766 * quotacheck is done only at mount time.
1767 */
1768 if ((error = xfs_iget(mp, NULL, ino, 0, XFS_ILOCK_EXCL, &ip, bno))) {
1769 *res = BULKSTAT_RV_NOTHING;
1770 return (error);
1771 }
1772
1773 if (ip->i_d.di_mode == 0) {
1774 xfs_iput_new(ip, XFS_ILOCK_EXCL);
1775 *res = BULKSTAT_RV_NOTHING;
1776 return XFS_ERROR(ENOENT);
1777 }
1778
1779 /*
1780 * Obtain the locked dquots. In case of an error (eg. allocation
1781 * fails for ENOSPC), we return the negative of the error number
1782 * to bulkstat, so that it can get propagated to quotacheck() and
1783 * making us disable quotas for the file system.
1784 */
1785 if ((error = xfs_qm_dqget_noattach(ip, &udqp, &gdqp))) {
1786 xfs_iput(ip, XFS_ILOCK_EXCL);
1787 *res = BULKSTAT_RV_GIVEUP;
1788 return (error);
1789 }
1790
1791 rtblks = 0;
1792 if (! XFS_IS_REALTIME_INODE(ip)) {
1793 nblks = (xfs_qcnt_t)ip->i_d.di_nblocks;
1794 } else {
1795 /*
1796 * Walk thru the extent list and count the realtime blocks.
1797 */
1798 if ((error = xfs_qm_get_rtblks(ip, &rtblks))) {
1799 xfs_iput(ip, XFS_ILOCK_EXCL);
1800 if (udqp)
1801 xfs_qm_dqput(udqp);
1802 if (gdqp)
1803 xfs_qm_dqput(gdqp);
1804 *res = BULKSTAT_RV_GIVEUP;
1805 return (error);
1806 }
1807 nblks = (xfs_qcnt_t)ip->i_d.di_nblocks - rtblks;
1808 }
1809 ASSERT(ip->i_delayed_blks == 0);
1810
1811 /*
1812 * We can't release the inode while holding its dquot locks.
1813 * The inode can go into inactive and might try to acquire the dquotlocks.
1814 * So, just unlock here and do a vn_rele at the end.
1815 */
1816 xfs_iunlock(ip, XFS_ILOCK_EXCL);
1817
1818 /*
1819 * Add the (disk blocks and inode) resources occupied by this
1820 * inode to its dquots. We do this adjustment in the incore dquot,
1821 * and also copy the changes to its buffer.
1822 * We don't care about putting these changes in a transaction
1823 * envelope because if we crash in the middle of a 'quotacheck'
1824 * we have to start from the beginning anyway.
1825 * Once we're done, we'll log all the dquot bufs.
1826 *
1827 * The *QUOTA_ON checks below may look pretty racey, but quotachecks
1828 * and quotaoffs don't race. (Quotachecks happen at mount time only).
1829 */
1830 if (XFS_IS_UQUOTA_ON(mp)) {
1831 ASSERT(udqp);
1832 xfs_qm_quotacheck_dqadjust(udqp, nblks, rtblks);
1833 xfs_qm_dqput(udqp);
1834 }
Nathan Scottc8ad20f2005-06-21 15:38:48 +10001835 if (XFS_IS_OQUOTA_ON(mp)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001836 ASSERT(gdqp);
1837 xfs_qm_quotacheck_dqadjust(gdqp, nblks, rtblks);
1838 xfs_qm_dqput(gdqp);
1839 }
1840 /*
1841 * Now release the inode. This will send it to 'inactive', and
1842 * possibly even free blocks.
1843 */
1844 VN_RELE(XFS_ITOV(ip));
1845
1846 /*
1847 * Goto next inode.
1848 */
1849 *res = BULKSTAT_RV_DIDONE;
1850 return (0);
1851}
1852
1853/*
1854 * Walk thru all the filesystem inodes and construct a consistent view
1855 * of the disk quota world. If the quotacheck fails, disable quotas.
1856 */
1857int
1858xfs_qm_quotacheck(
1859 xfs_mount_t *mp)
1860{
1861 int done, count, error;
1862 xfs_ino_t lastino;
1863 size_t structsz;
1864 xfs_inode_t *uip, *gip;
1865 uint flags;
1866
1867 count = INT_MAX;
1868 structsz = 1;
1869 lastino = 0;
1870 flags = 0;
1871
1872 ASSERT(XFS_QI_UQIP(mp) || XFS_QI_GQIP(mp));
1873 ASSERT(XFS_IS_QUOTA_RUNNING(mp));
1874
1875 /*
1876 * There should be no cached dquots. The (simplistic) quotacheck
1877 * algorithm doesn't like that.
1878 */
1879 ASSERT(XFS_QI_MPLNDQUOTS(mp) == 0);
1880
1881 cmn_err(CE_NOTE, "XFS quotacheck %s: Please wait.", mp->m_fsname);
1882
1883 /*
Nathan Scottc8ad20f2005-06-21 15:38:48 +10001884 * First we go thru all the dquots on disk, USR and GRP/PRJ, and reset
Linus Torvalds1da177e2005-04-16 15:20:36 -07001885 * their counters to zero. We need a clean slate.
1886 * We don't log our changes till later.
1887 */
1888 if ((uip = XFS_QI_UQIP(mp))) {
1889 if ((error = xfs_qm_dqiterate(mp, uip, XFS_QMOPT_UQUOTA)))
1890 goto error_return;
1891 flags |= XFS_UQUOTA_CHKD;
1892 }
1893
1894 if ((gip = XFS_QI_GQIP(mp))) {
Nathan Scottc8ad20f2005-06-21 15:38:48 +10001895 if ((error = xfs_qm_dqiterate(mp, gip, XFS_IS_GQUOTA_ON(mp) ?
1896 XFS_QMOPT_GQUOTA : XFS_QMOPT_PQUOTA)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001897 goto error_return;
Nathan Scottc8ad20f2005-06-21 15:38:48 +10001898 flags |= XFS_OQUOTA_CHKD;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001899 }
1900
1901 do {
1902 /*
1903 * Iterate thru all the inodes in the file system,
1904 * adjusting the corresponding dquot counters in core.
1905 */
1906 if ((error = xfs_bulkstat(mp, &lastino, &count,
1907 xfs_qm_dqusage_adjust, NULL,
1908 structsz, NULL,
1909 BULKSTAT_FG_IGET|BULKSTAT_FG_VFSLOCKED,
1910 &done)))
1911 break;
1912
1913 } while (! done);
1914
1915 /*
1916 * We can get this error if we couldn't do a dquot allocation inside
1917 * xfs_qm_dqusage_adjust (via bulkstat). We don't care about the
1918 * dirty dquots that might be cached, we just want to get rid of them
1919 * and turn quotaoff. The dquots won't be attached to any of the inodes
1920 * at this point (because we intentionally didn't in dqget_noattach).
1921 */
1922 if (error) {
1923 xfs_qm_dqpurge_all(mp,
1924 XFS_QMOPT_UQUOTA|XFS_QMOPT_GQUOTA|
Nathan Scottc8ad20f2005-06-21 15:38:48 +10001925 XFS_QMOPT_PQUOTA|XFS_QMOPT_QUOTAOFF);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001926 goto error_return;
1927 }
1928 /*
1929 * We've made all the changes that we need to make incore.
1930 * Now flush_them down to disk buffers.
1931 */
1932 xfs_qm_dqflush_all(mp, XFS_QMOPT_DELWRI);
1933
1934 /*
1935 * We didn't log anything, because if we crashed, we'll have to
1936 * start the quotacheck from scratch anyway. However, we must make
1937 * sure that our dquot changes are secure before we put the
1938 * quotacheck'd stamp on the superblock. So, here we do a synchronous
1939 * flush.
1940 */
1941 XFS_bflush(mp->m_ddev_targp);
1942
1943 /*
1944 * If one type of quotas is off, then it will lose its
1945 * quotachecked status, since we won't be doing accounting for
1946 * that type anymore.
1947 */
Nathan Scottc8ad20f2005-06-21 15:38:48 +10001948 mp->m_qflags &= ~(XFS_OQUOTA_CHKD | XFS_UQUOTA_CHKD);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001949 mp->m_qflags |= flags;
1950
1951 XQM_LIST_PRINT(&(XFS_QI_MPL_LIST(mp)), MPL_NEXT, "++++ Mp list +++");
1952
1953 error_return:
1954 if (error) {
1955 cmn_err(CE_WARN, "XFS quotacheck %s: Unsuccessful (Error %d): "
1956 "Disabling quotas.",
1957 mp->m_fsname, error);
1958 /*
1959 * We must turn off quotas.
1960 */
1961 ASSERT(mp->m_quotainfo != NULL);
1962 ASSERT(xfs_Gqm != NULL);
1963 xfs_qm_destroy_quotainfo(mp);
Tim Shimmin4cd4a032005-09-05 08:24:10 +10001964 (void)xfs_mount_reset_sbqflags(mp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001965 } else {
1966 cmn_err(CE_NOTE, "XFS quotacheck %s: Done.", mp->m_fsname);
1967 }
1968 return (error);
1969}
1970
1971/*
1972 * This is called after the superblock has been read in and we're ready to
1973 * iget the quota inodes.
1974 */
1975STATIC int
1976xfs_qm_init_quotainos(
1977 xfs_mount_t *mp)
1978{
1979 xfs_inode_t *uip, *gip;
1980 int error;
1981 __int64_t sbflags;
1982 uint flags;
1983
1984 ASSERT(mp->m_quotainfo);
1985 uip = gip = NULL;
1986 sbflags = 0;
1987 flags = 0;
1988
1989 /*
1990 * Get the uquota and gquota inodes
1991 */
1992 if (XFS_SB_VERSION_HASQUOTA(&mp->m_sb)) {
1993 if (XFS_IS_UQUOTA_ON(mp) &&
1994 mp->m_sb.sb_uquotino != NULLFSINO) {
1995 ASSERT(mp->m_sb.sb_uquotino > 0);
1996 if ((error = xfs_iget(mp, NULL, mp->m_sb.sb_uquotino,
1997 0, 0, &uip, 0)))
1998 return XFS_ERROR(error);
1999 }
Nathan Scottc8ad20f2005-06-21 15:38:48 +10002000 if (XFS_IS_OQUOTA_ON(mp) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -07002001 mp->m_sb.sb_gquotino != NULLFSINO) {
2002 ASSERT(mp->m_sb.sb_gquotino > 0);
2003 if ((error = xfs_iget(mp, NULL, mp->m_sb.sb_gquotino,
2004 0, 0, &gip, 0))) {
2005 if (uip)
2006 VN_RELE(XFS_ITOV(uip));
2007 return XFS_ERROR(error);
2008 }
2009 }
2010 } else {
2011 flags |= XFS_QMOPT_SBVERSION;
2012 sbflags |= (XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
2013 XFS_SB_GQUOTINO | XFS_SB_QFLAGS);
2014 }
2015
2016 /*
2017 * Create the two inodes, if they don't exist already. The changes
2018 * made above will get added to a transaction and logged in one of
2019 * the qino_alloc calls below. If the device is readonly,
2020 * temporarily switch to read-write to do this.
2021 */
2022 if (XFS_IS_UQUOTA_ON(mp) && uip == NULL) {
2023 if ((error = xfs_qm_qino_alloc(mp, &uip,
2024 sbflags | XFS_SB_UQUOTINO,
2025 flags | XFS_QMOPT_UQUOTA)))
2026 return XFS_ERROR(error);
2027
2028 flags &= ~XFS_QMOPT_SBVERSION;
2029 }
Nathan Scottc8ad20f2005-06-21 15:38:48 +10002030 if (XFS_IS_OQUOTA_ON(mp) && gip == NULL) {
2031 flags |= (XFS_IS_GQUOTA_ON(mp) ?
2032 XFS_QMOPT_GQUOTA : XFS_QMOPT_PQUOTA);
2033 error = xfs_qm_qino_alloc(mp, &gip,
2034 sbflags | XFS_SB_GQUOTINO, flags);
2035 if (error) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002036 if (uip)
2037 VN_RELE(XFS_ITOV(uip));
2038
2039 return XFS_ERROR(error);
2040 }
2041 }
2042
2043 XFS_QI_UQIP(mp) = uip;
2044 XFS_QI_GQIP(mp) = gip;
2045
2046 return (0);
2047}
2048
2049
2050/*
2051 * Traverse the freelist of dquots and attempt to reclaim a maximum of
2052 * 'howmany' dquots. This operation races with dqlookup(), and attempts to
2053 * favor the lookup function ...
2054 * XXXsup merge this with qm_reclaim_one().
2055 */
2056STATIC int
2057xfs_qm_shake_freelist(
2058 int howmany)
2059{
2060 int nreclaimed;
2061 xfs_dqhash_t *hash;
2062 xfs_dquot_t *dqp, *nextdqp;
2063 int restarts;
2064 int nflushes;
2065
2066 if (howmany <= 0)
2067 return (0);
2068
2069 nreclaimed = 0;
2070 restarts = 0;
2071 nflushes = 0;
2072
2073#ifdef QUOTADEBUG
2074 cmn_err(CE_DEBUG, "Shake free 0x%x", howmany);
2075#endif
2076 /* lock order is : hashchainlock, freelistlock, mplistlock */
2077 tryagain:
2078 xfs_qm_freelist_lock(xfs_Gqm);
2079
2080 for (dqp = xfs_Gqm->qm_dqfreelist.qh_next;
2081 ((dqp != (xfs_dquot_t *) &xfs_Gqm->qm_dqfreelist) &&
2082 nreclaimed < howmany); ) {
2083 xfs_dqlock(dqp);
2084
2085 /*
2086 * We are racing with dqlookup here. Naturally we don't
2087 * want to reclaim a dquot that lookup wants.
2088 */
2089 if (dqp->dq_flags & XFS_DQ_WANT) {
2090 xfs_dqunlock(dqp);
2091 xfs_qm_freelist_unlock(xfs_Gqm);
2092 if (++restarts >= XFS_QM_RECLAIM_MAX_RESTARTS)
2093 return (nreclaimed);
2094 XQM_STATS_INC(xqmstats.xs_qm_dqwants);
2095 goto tryagain;
2096 }
2097
2098 /*
2099 * If the dquot is inactive, we are assured that it is
2100 * not on the mplist or the hashlist, and that makes our
2101 * life easier.
2102 */
2103 if (dqp->dq_flags & XFS_DQ_INACTIVE) {
2104 ASSERT(dqp->q_mount == NULL);
2105 ASSERT(! XFS_DQ_IS_DIRTY(dqp));
2106 ASSERT(dqp->HL_PREVP == NULL);
2107 ASSERT(dqp->MPL_PREVP == NULL);
2108 XQM_STATS_INC(xqmstats.xs_qm_dqinact_reclaims);
2109 nextdqp = dqp->dq_flnext;
2110 goto off_freelist;
2111 }
2112
2113 ASSERT(dqp->MPL_PREVP);
2114 /*
2115 * Try to grab the flush lock. If this dquot is in the process of
2116 * getting flushed to disk, we don't want to reclaim it.
2117 */
2118 if (! xfs_qm_dqflock_nowait(dqp)) {
2119 xfs_dqunlock(dqp);
2120 dqp = dqp->dq_flnext;
2121 continue;
2122 }
2123
2124 /*
2125 * We have the flush lock so we know that this is not in the
2126 * process of being flushed. So, if this is dirty, flush it
2127 * DELWRI so that we don't get a freelist infested with
2128 * dirty dquots.
2129 */
2130 if (XFS_DQ_IS_DIRTY(dqp)) {
2131 xfs_dqtrace_entry(dqp, "DQSHAKE: DQDIRTY");
2132 /*
2133 * We flush it delayed write, so don't bother
2134 * releasing the mplock.
2135 */
2136 (void) xfs_qm_dqflush(dqp, XFS_QMOPT_DELWRI);
2137 xfs_dqunlock(dqp); /* dqflush unlocks dqflock */
2138 dqp = dqp->dq_flnext;
2139 continue;
2140 }
2141 /*
2142 * We're trying to get the hashlock out of order. This races
2143 * with dqlookup; so, we giveup and goto the next dquot if
2144 * we couldn't get the hashlock. This way, we won't starve
2145 * a dqlookup process that holds the hashlock that is
2146 * waiting for the freelist lock.
2147 */
2148 if (! xfs_qm_dqhashlock_nowait(dqp)) {
2149 xfs_dqfunlock(dqp);
2150 xfs_dqunlock(dqp);
2151 dqp = dqp->dq_flnext;
2152 continue;
2153 }
2154 /*
2155 * This races with dquot allocation code as well as dqflush_all
2156 * and reclaim code. So, if we failed to grab the mplist lock,
2157 * giveup everything and start over.
2158 */
2159 hash = dqp->q_hash;
2160 ASSERT(hash);
2161 if (! xfs_qm_mplist_nowait(dqp->q_mount)) {
2162 /* XXX put a sentinel so that we can come back here */
2163 xfs_dqfunlock(dqp);
2164 xfs_dqunlock(dqp);
2165 XFS_DQ_HASH_UNLOCK(hash);
2166 xfs_qm_freelist_unlock(xfs_Gqm);
2167 if (++restarts >= XFS_QM_RECLAIM_MAX_RESTARTS)
2168 return (nreclaimed);
2169 goto tryagain;
2170 }
2171 xfs_dqtrace_entry(dqp, "DQSHAKE: UNLINKING");
2172#ifdef QUOTADEBUG
2173 cmn_err(CE_DEBUG, "Shake 0x%p, ID 0x%x\n",
Christoph Hellwig1149d962005-11-02 15:01:12 +11002174 dqp, be32_to_cpu(dqp->q_core.d_id));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002175#endif
2176 ASSERT(dqp->q_nrefs == 0);
2177 nextdqp = dqp->dq_flnext;
2178 XQM_MPLIST_REMOVE(&(XFS_QI_MPL_LIST(dqp->q_mount)), dqp);
2179 XQM_HASHLIST_REMOVE(hash, dqp);
2180 xfs_dqfunlock(dqp);
2181 xfs_qm_mplist_unlock(dqp->q_mount);
2182 XFS_DQ_HASH_UNLOCK(hash);
2183
2184 off_freelist:
2185 XQM_FREELIST_REMOVE(dqp);
2186 xfs_dqunlock(dqp);
2187 nreclaimed++;
2188 XQM_STATS_INC(xqmstats.xs_qm_dqshake_reclaims);
2189 xfs_qm_dqdestroy(dqp);
2190 dqp = nextdqp;
2191 }
2192 xfs_qm_freelist_unlock(xfs_Gqm);
2193 return (nreclaimed);
2194}
2195
2196
2197/*
2198 * The kmem_shake interface is invoked when memory is running low.
2199 */
2200/* ARGSUSED */
2201STATIC int
Al Viro51bfb752005-12-15 09:17:24 +00002202xfs_qm_shake(int nr_to_scan, gfp_t gfp_mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002203{
2204 int ndqused, nfree, n;
2205
2206 if (!kmem_shake_allow(gfp_mask))
2207 return (0);
2208 if (!xfs_Gqm)
2209 return (0);
2210
2211 nfree = xfs_Gqm->qm_dqfreelist.qh_nelems; /* free dquots */
2212 /* incore dquots in all f/s's */
2213 ndqused = atomic_read(&xfs_Gqm->qm_totaldquots) - nfree;
2214
2215 ASSERT(ndqused >= 0);
2216
2217 if (nfree <= ndqused && nfree < ndquot)
2218 return (0);
2219
2220 ndqused *= xfs_Gqm->qm_dqfree_ratio; /* target # of free dquots */
2221 n = nfree - ndqused - ndquot; /* # over target */
2222
2223 return xfs_qm_shake_freelist(MAX(nfree, n));
2224}
2225
2226
2227/*
2228 * Just pop the least recently used dquot off the freelist and
2229 * recycle it. The returned dquot is locked.
2230 */
2231STATIC xfs_dquot_t *
2232xfs_qm_dqreclaim_one(void)
2233{
2234 xfs_dquot_t *dqpout;
2235 xfs_dquot_t *dqp;
2236 int restarts;
2237 int nflushes;
2238
2239 restarts = 0;
2240 dqpout = NULL;
2241 nflushes = 0;
2242
2243 /* lockorder: hashchainlock, freelistlock, mplistlock, dqlock, dqflock */
2244 startagain:
2245 xfs_qm_freelist_lock(xfs_Gqm);
2246
2247 FOREACH_DQUOT_IN_FREELIST(dqp, &(xfs_Gqm->qm_dqfreelist)) {
2248 xfs_dqlock(dqp);
2249
2250 /*
2251 * We are racing with dqlookup here. Naturally we don't
2252 * want to reclaim a dquot that lookup wants. We release the
2253 * freelist lock and start over, so that lookup will grab
2254 * both the dquot and the freelistlock.
2255 */
2256 if (dqp->dq_flags & XFS_DQ_WANT) {
2257 ASSERT(! (dqp->dq_flags & XFS_DQ_INACTIVE));
2258 xfs_dqtrace_entry(dqp, "DQRECLAIM: DQWANT");
2259 xfs_dqunlock(dqp);
2260 xfs_qm_freelist_unlock(xfs_Gqm);
2261 if (++restarts >= XFS_QM_RECLAIM_MAX_RESTARTS)
2262 return (NULL);
2263 XQM_STATS_INC(xqmstats.xs_qm_dqwants);
2264 goto startagain;
2265 }
2266
2267 /*
2268 * If the dquot is inactive, we are assured that it is
2269 * not on the mplist or the hashlist, and that makes our
2270 * life easier.
2271 */
2272 if (dqp->dq_flags & XFS_DQ_INACTIVE) {
2273 ASSERT(dqp->q_mount == NULL);
2274 ASSERT(! XFS_DQ_IS_DIRTY(dqp));
2275 ASSERT(dqp->HL_PREVP == NULL);
2276 ASSERT(dqp->MPL_PREVP == NULL);
2277 XQM_FREELIST_REMOVE(dqp);
2278 xfs_dqunlock(dqp);
2279 dqpout = dqp;
2280 XQM_STATS_INC(xqmstats.xs_qm_dqinact_reclaims);
2281 break;
2282 }
2283
2284 ASSERT(dqp->q_hash);
2285 ASSERT(dqp->MPL_PREVP);
2286
2287 /*
2288 * Try to grab the flush lock. If this dquot is in the process of
2289 * getting flushed to disk, we don't want to reclaim it.
2290 */
2291 if (! xfs_qm_dqflock_nowait(dqp)) {
2292 xfs_dqunlock(dqp);
2293 continue;
2294 }
2295
2296 /*
2297 * We have the flush lock so we know that this is not in the
2298 * process of being flushed. So, if this is dirty, flush it
2299 * DELWRI so that we don't get a freelist infested with
2300 * dirty dquots.
2301 */
2302 if (XFS_DQ_IS_DIRTY(dqp)) {
2303 xfs_dqtrace_entry(dqp, "DQRECLAIM: DQDIRTY");
2304 /*
2305 * We flush it delayed write, so don't bother
2306 * releasing the freelist lock.
2307 */
2308 (void) xfs_qm_dqflush(dqp, XFS_QMOPT_DELWRI);
2309 xfs_dqunlock(dqp); /* dqflush unlocks dqflock */
2310 continue;
2311 }
2312
2313 if (! xfs_qm_mplist_nowait(dqp->q_mount)) {
2314 xfs_dqfunlock(dqp);
2315 xfs_dqunlock(dqp);
2316 continue;
2317 }
2318
2319 if (! xfs_qm_dqhashlock_nowait(dqp))
2320 goto mplistunlock;
2321
2322 ASSERT(dqp->q_nrefs == 0);
2323 xfs_dqtrace_entry(dqp, "DQRECLAIM: UNLINKING");
2324 XQM_MPLIST_REMOVE(&(XFS_QI_MPL_LIST(dqp->q_mount)), dqp);
2325 XQM_HASHLIST_REMOVE(dqp->q_hash, dqp);
2326 XQM_FREELIST_REMOVE(dqp);
2327 dqpout = dqp;
2328 XFS_DQ_HASH_UNLOCK(dqp->q_hash);
2329 mplistunlock:
2330 xfs_qm_mplist_unlock(dqp->q_mount);
2331 xfs_dqfunlock(dqp);
2332 xfs_dqunlock(dqp);
2333 if (dqpout)
2334 break;
2335 }
2336
2337 xfs_qm_freelist_unlock(xfs_Gqm);
2338 return (dqpout);
2339}
2340
2341
2342/*------------------------------------------------------------------*/
2343
2344/*
2345 * Return a new incore dquot. Depending on the number of
2346 * dquots in the system, we either allocate a new one on the kernel heap,
2347 * or reclaim a free one.
2348 * Return value is B_TRUE if we allocated a new dquot, B_FALSE if we managed
2349 * to reclaim an existing one from the freelist.
2350 */
2351boolean_t
2352xfs_qm_dqalloc_incore(
2353 xfs_dquot_t **O_dqpp)
2354{
2355 xfs_dquot_t *dqp;
2356
2357 /*
2358 * Check against high water mark to see if we want to pop
2359 * a nincompoop dquot off the freelist.
2360 */
2361 if (atomic_read(&xfs_Gqm->qm_totaldquots) >= ndquot) {
2362 /*
2363 * Try to recycle a dquot from the freelist.
2364 */
2365 if ((dqp = xfs_qm_dqreclaim_one())) {
2366 XQM_STATS_INC(xqmstats.xs_qm_dqreclaims);
2367 /*
2368 * Just zero the core here. The rest will get
2369 * reinitialized by caller. XXX we shouldn't even
2370 * do this zero ...
2371 */
2372 memset(&dqp->q_core, 0, sizeof(dqp->q_core));
2373 *O_dqpp = dqp;
2374 return (B_FALSE);
2375 }
2376 XQM_STATS_INC(xqmstats.xs_qm_dqreclaim_misses);
2377 }
2378
2379 /*
2380 * Allocate a brand new dquot on the kernel heap and return it
2381 * to the caller to initialize.
2382 */
2383 ASSERT(xfs_Gqm->qm_dqzone != NULL);
2384 *O_dqpp = kmem_zone_zalloc(xfs_Gqm->qm_dqzone, KM_SLEEP);
2385 atomic_inc(&xfs_Gqm->qm_totaldquots);
2386
2387 return (B_TRUE);
2388}
2389
2390
2391/*
2392 * Start a transaction and write the incore superblock changes to
2393 * disk. flags parameter indicates which fields have changed.
2394 */
2395int
2396xfs_qm_write_sb_changes(
2397 xfs_mount_t *mp,
2398 __int64_t flags)
2399{
2400 xfs_trans_t *tp;
2401 int error;
2402
2403#ifdef QUOTADEBUG
2404 cmn_err(CE_NOTE, "Writing superblock quota changes :%s", mp->m_fsname);
2405#endif
2406 tp = xfs_trans_alloc(mp, XFS_TRANS_QM_SBCHANGE);
2407 if ((error = xfs_trans_reserve(tp, 0,
2408 mp->m_sb.sb_sectsize + 128, 0,
2409 0,
2410 XFS_DEFAULT_LOG_COUNT))) {
2411 xfs_trans_cancel(tp, 0);
2412 return (error);
2413 }
2414
2415 xfs_mod_sb(tp, flags);
2416 (void) xfs_trans_commit(tp, 0, NULL);
2417
2418 return (0);
2419}
2420
2421
2422/* --------------- utility functions for vnodeops ---------------- */
2423
2424
2425/*
2426 * Given an inode, a uid and gid (from cred_t) make sure that we have
2427 * allocated relevant dquot(s) on disk, and that we won't exceed inode
2428 * quotas by creating this file.
2429 * This also attaches dquot(s) to the given inode after locking it,
2430 * and returns the dquots corresponding to the uid and/or gid.
2431 *
2432 * in : inode (unlocked)
2433 * out : udquot, gdquot with references taken and unlocked
2434 */
2435int
2436xfs_qm_vop_dqalloc(
2437 xfs_mount_t *mp,
2438 xfs_inode_t *ip,
2439 uid_t uid,
2440 gid_t gid,
Nathan Scottc8ad20f2005-06-21 15:38:48 +10002441 prid_t prid,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002442 uint flags,
2443 xfs_dquot_t **O_udqpp,
2444 xfs_dquot_t **O_gdqpp)
2445{
2446 int error;
2447 xfs_dquot_t *uq, *gq;
2448 uint lockflags;
2449
2450 if (!XFS_IS_QUOTA_ON(mp))
2451 return 0;
2452
2453 lockflags = XFS_ILOCK_EXCL;
2454 xfs_ilock(ip, lockflags);
2455
2456 if ((flags & XFS_QMOPT_INHERIT) &&
2457 XFS_INHERIT_GID(ip, XFS_MTOVFS(mp)))
2458 gid = ip->i_d.di_gid;
2459
2460 /*
2461 * Attach the dquot(s) to this inode, doing a dquot allocation
2462 * if necessary. The dquot(s) will not be locked.
2463 */
2464 if (XFS_NOT_DQATTACHED(mp, ip)) {
2465 if ((error = xfs_qm_dqattach(ip, XFS_QMOPT_DQALLOC |
2466 XFS_QMOPT_ILOCKED))) {
2467 xfs_iunlock(ip, lockflags);
2468 return (error);
2469 }
2470 }
2471
2472 uq = gq = NULL;
Nathan Scottc8ad20f2005-06-21 15:38:48 +10002473 if ((flags & XFS_QMOPT_UQUOTA) && XFS_IS_UQUOTA_ON(mp)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002474 if (ip->i_d.di_uid != uid) {
2475 /*
2476 * What we need is the dquot that has this uid, and
2477 * if we send the inode to dqget, the uid of the inode
2478 * takes priority over what's sent in the uid argument.
2479 * We must unlock inode here before calling dqget if
2480 * we're not sending the inode, because otherwise
2481 * we'll deadlock by doing trans_reserve while
2482 * holding ilock.
2483 */
2484 xfs_iunlock(ip, lockflags);
2485 if ((error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t) uid,
2486 XFS_DQ_USER,
2487 XFS_QMOPT_DQALLOC |
2488 XFS_QMOPT_DOWARN,
2489 &uq))) {
2490 ASSERT(error != ENOENT);
2491 return (error);
2492 }
2493 /*
2494 * Get the ilock in the right order.
2495 */
2496 xfs_dqunlock(uq);
2497 lockflags = XFS_ILOCK_SHARED;
2498 xfs_ilock(ip, lockflags);
2499 } else {
2500 /*
2501 * Take an extra reference, because we'll return
2502 * this to caller
2503 */
2504 ASSERT(ip->i_udquot);
2505 uq = ip->i_udquot;
2506 xfs_dqlock(uq);
2507 XFS_DQHOLD(uq);
2508 xfs_dqunlock(uq);
2509 }
2510 }
Nathan Scottc8ad20f2005-06-21 15:38:48 +10002511 if ((flags & XFS_QMOPT_GQUOTA) && XFS_IS_GQUOTA_ON(mp)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002512 if (ip->i_d.di_gid != gid) {
2513 xfs_iunlock(ip, lockflags);
2514 if ((error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t)gid,
2515 XFS_DQ_GROUP,
2516 XFS_QMOPT_DQALLOC |
2517 XFS_QMOPT_DOWARN,
2518 &gq))) {
2519 if (uq)
2520 xfs_qm_dqrele(uq);
2521 ASSERT(error != ENOENT);
2522 return (error);
2523 }
2524 xfs_dqunlock(gq);
2525 lockflags = XFS_ILOCK_SHARED;
2526 xfs_ilock(ip, lockflags);
2527 } else {
2528 ASSERT(ip->i_gdquot);
2529 gq = ip->i_gdquot;
2530 xfs_dqlock(gq);
2531 XFS_DQHOLD(gq);
2532 xfs_dqunlock(gq);
2533 }
Nathan Scottc8ad20f2005-06-21 15:38:48 +10002534 } else if ((flags & XFS_QMOPT_PQUOTA) && XFS_IS_PQUOTA_ON(mp)) {
2535 if (ip->i_d.di_projid != prid) {
2536 xfs_iunlock(ip, lockflags);
2537 if ((error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t)prid,
2538 XFS_DQ_PROJ,
2539 XFS_QMOPT_DQALLOC |
2540 XFS_QMOPT_DOWARN,
2541 &gq))) {
2542 if (uq)
2543 xfs_qm_dqrele(uq);
2544 ASSERT(error != ENOENT);
2545 return (error);
2546 }
2547 xfs_dqunlock(gq);
2548 lockflags = XFS_ILOCK_SHARED;
2549 xfs_ilock(ip, lockflags);
2550 } else {
2551 ASSERT(ip->i_gdquot);
2552 gq = ip->i_gdquot;
2553 xfs_dqlock(gq);
2554 XFS_DQHOLD(gq);
2555 xfs_dqunlock(gq);
2556 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002557 }
2558 if (uq)
2559 xfs_dqtrace_entry_ino(uq, "DQALLOC", ip);
2560
2561 xfs_iunlock(ip, lockflags);
2562 if (O_udqpp)
2563 *O_udqpp = uq;
2564 else if (uq)
2565 xfs_qm_dqrele(uq);
2566 if (O_gdqpp)
2567 *O_gdqpp = gq;
2568 else if (gq)
2569 xfs_qm_dqrele(gq);
2570 return (0);
2571}
2572
2573/*
2574 * Actually transfer ownership, and do dquot modifications.
2575 * These were already reserved.
2576 */
2577xfs_dquot_t *
2578xfs_qm_vop_chown(
2579 xfs_trans_t *tp,
2580 xfs_inode_t *ip,
2581 xfs_dquot_t **IO_olddq,
2582 xfs_dquot_t *newdq)
2583{
2584 xfs_dquot_t *prevdq;
Nathan Scott06d10dd2005-06-21 15:48:47 +10002585 uint bfield = XFS_IS_REALTIME_INODE(ip) ?
2586 XFS_TRANS_DQ_RTBCOUNT : XFS_TRANS_DQ_BCOUNT;
2587
Linus Torvalds1da177e2005-04-16 15:20:36 -07002588 ASSERT(XFS_ISLOCKED_INODE_EXCL(ip));
2589 ASSERT(XFS_IS_QUOTA_RUNNING(ip->i_mount));
2590
2591 /* old dquot */
2592 prevdq = *IO_olddq;
2593 ASSERT(prevdq);
2594 ASSERT(prevdq != newdq);
2595
Nathan Scott06d10dd2005-06-21 15:48:47 +10002596 xfs_trans_mod_dquot(tp, prevdq, bfield, -(ip->i_d.di_nblocks));
2597 xfs_trans_mod_dquot(tp, prevdq, XFS_TRANS_DQ_ICOUNT, -1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002598
2599 /* the sparkling new dquot */
Nathan Scott06d10dd2005-06-21 15:48:47 +10002600 xfs_trans_mod_dquot(tp, newdq, bfield, ip->i_d.di_nblocks);
2601 xfs_trans_mod_dquot(tp, newdq, XFS_TRANS_DQ_ICOUNT, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002602
2603 /*
2604 * Take an extra reference, because the inode
2605 * is going to keep this dquot pointer even
2606 * after the trans_commit.
2607 */
2608 xfs_dqlock(newdq);
2609 XFS_DQHOLD(newdq);
2610 xfs_dqunlock(newdq);
2611 *IO_olddq = newdq;
2612
2613 return (prevdq);
2614}
2615
2616/*
Nathan Scottc8ad20f2005-06-21 15:38:48 +10002617 * Quota reservations for setattr(AT_UID|AT_GID|AT_PROJID).
Linus Torvalds1da177e2005-04-16 15:20:36 -07002618 */
2619int
2620xfs_qm_vop_chown_reserve(
2621 xfs_trans_t *tp,
2622 xfs_inode_t *ip,
2623 xfs_dquot_t *udqp,
2624 xfs_dquot_t *gdqp,
2625 uint flags)
2626{
2627 int error;
2628 xfs_mount_t *mp;
Nathan Scott06d10dd2005-06-21 15:48:47 +10002629 uint delblks, blkflags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002630 xfs_dquot_t *unresudq, *unresgdq, *delblksudq, *delblksgdq;
2631
2632 ASSERT(XFS_ISLOCKED_INODE(ip));
2633 mp = ip->i_mount;
2634 ASSERT(XFS_IS_QUOTA_RUNNING(mp));
2635
2636 delblks = ip->i_delayed_blks;
2637 delblksudq = delblksgdq = unresudq = unresgdq = NULL;
Nathan Scott06d10dd2005-06-21 15:48:47 +10002638 blkflags = XFS_IS_REALTIME_INODE(ip) ?
2639 XFS_QMOPT_RES_RTBLKS : XFS_QMOPT_RES_REGBLKS;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002640
2641 if (XFS_IS_UQUOTA_ON(mp) && udqp &&
Christoph Hellwig1149d962005-11-02 15:01:12 +11002642 ip->i_d.di_uid != (uid_t)be32_to_cpu(udqp->q_core.d_id)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002643 delblksudq = udqp;
2644 /*
2645 * If there are delayed allocation blocks, then we have to
2646 * unreserve those from the old dquot, and add them to the
2647 * new dquot.
2648 */
2649 if (delblks) {
2650 ASSERT(ip->i_udquot);
2651 unresudq = ip->i_udquot;
2652 }
2653 }
Nathan Scottc8ad20f2005-06-21 15:38:48 +10002654 if (XFS_IS_OQUOTA_ON(ip->i_mount) && gdqp) {
Christoph Hellwig1149d962005-11-02 15:01:12 +11002655 if ((XFS_IS_GQUOTA_ON(ip->i_mount) &&
2656 ip->i_d.di_gid != be32_to_cpu(gdqp->q_core.d_id)) ||
2657 (XFS_IS_PQUOTA_ON(ip->i_mount) &&
2658 ip->i_d.di_projid != be32_to_cpu(gdqp->q_core.d_id))) {
Nathan Scottc8ad20f2005-06-21 15:38:48 +10002659 delblksgdq = gdqp;
2660 if (delblks) {
2661 ASSERT(ip->i_gdquot);
2662 unresgdq = ip->i_gdquot;
2663 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002664 }
2665 }
2666
2667 if ((error = xfs_trans_reserve_quota_bydquots(tp, ip->i_mount,
2668 delblksudq, delblksgdq, ip->i_d.di_nblocks, 1,
Nathan Scott06d10dd2005-06-21 15:48:47 +10002669 flags | blkflags)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002670 return (error);
2671
2672 /*
2673 * Do the delayed blks reservations/unreservations now. Since, these
2674 * are done without the help of a transaction, if a reservation fails
2675 * its previous reservations won't be automatically undone by trans
2676 * code. So, we have to do it manually here.
2677 */
2678 if (delblks) {
2679 /*
2680 * Do the reservations first. Unreservation can't fail.
2681 */
2682 ASSERT(delblksudq || delblksgdq);
2683 ASSERT(unresudq || unresgdq);
2684 if ((error = xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
2685 delblksudq, delblksgdq, (xfs_qcnt_t)delblks, 0,
Nathan Scott06d10dd2005-06-21 15:48:47 +10002686 flags | blkflags)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002687 return (error);
2688 xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
2689 unresudq, unresgdq, -((xfs_qcnt_t)delblks), 0,
Nathan Scott06d10dd2005-06-21 15:48:47 +10002690 blkflags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002691 }
2692
2693 return (0);
2694}
2695
2696int
2697xfs_qm_vop_rename_dqattach(
2698 xfs_inode_t **i_tab)
2699{
2700 xfs_inode_t *ip;
2701 int i;
2702 int error;
2703
2704 ip = i_tab[0];
2705
2706 if (! XFS_IS_QUOTA_ON(ip->i_mount))
2707 return (0);
2708
2709 if (XFS_NOT_DQATTACHED(ip->i_mount, ip)) {
2710 error = xfs_qm_dqattach(ip, 0);
2711 if (error)
2712 return (error);
2713 }
2714 for (i = 1; (i < 4 && i_tab[i]); i++) {
2715 /*
2716 * Watch out for duplicate entries in the table.
2717 */
2718 if ((ip = i_tab[i]) != i_tab[i-1]) {
2719 if (XFS_NOT_DQATTACHED(ip->i_mount, ip)) {
2720 error = xfs_qm_dqattach(ip, 0);
2721 if (error)
2722 return (error);
2723 }
2724 }
2725 }
2726 return (0);
2727}
2728
2729void
2730xfs_qm_vop_dqattach_and_dqmod_newinode(
2731 xfs_trans_t *tp,
2732 xfs_inode_t *ip,
2733 xfs_dquot_t *udqp,
2734 xfs_dquot_t *gdqp)
2735{
2736 if (!XFS_IS_QUOTA_ON(tp->t_mountp))
2737 return;
2738
2739 ASSERT(XFS_ISLOCKED_INODE_EXCL(ip));
2740 ASSERT(XFS_IS_QUOTA_RUNNING(tp->t_mountp));
2741
2742 if (udqp) {
2743 xfs_dqlock(udqp);
2744 XFS_DQHOLD(udqp);
2745 xfs_dqunlock(udqp);
2746 ASSERT(ip->i_udquot == NULL);
2747 ip->i_udquot = udqp;
Christoph Hellwig1149d962005-11-02 15:01:12 +11002748 ASSERT(ip->i_d.di_uid == be32_to_cpu(udqp->q_core.d_id));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002749 xfs_trans_mod_dquot(tp, udqp, XFS_TRANS_DQ_ICOUNT, 1);
2750 }
2751 if (gdqp) {
2752 xfs_dqlock(gdqp);
2753 XFS_DQHOLD(gdqp);
2754 xfs_dqunlock(gdqp);
2755 ASSERT(ip->i_gdquot == NULL);
2756 ip->i_gdquot = gdqp;
Christoph Hellwig1149d962005-11-02 15:01:12 +11002757 ASSERT(ip->i_d.di_gid == be32_to_cpu(gdqp->q_core.d_id));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002758 xfs_trans_mod_dquot(tp, gdqp, XFS_TRANS_DQ_ICOUNT, 1);
2759 }
2760}
2761
2762/* ------------- list stuff -----------------*/
Christoph Hellwigba0f32d2005-06-21 15:36:52 +10002763STATIC void
Linus Torvalds1da177e2005-04-16 15:20:36 -07002764xfs_qm_freelist_init(xfs_frlist_t *ql)
2765{
2766 ql->qh_next = ql->qh_prev = (xfs_dquot_t *) ql;
Jes Sorensen794ee1b2006-01-09 15:59:21 -08002767 mutex_init(&ql->qh_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002768 ql->qh_version = 0;
2769 ql->qh_nelems = 0;
2770}
2771
Christoph Hellwigba0f32d2005-06-21 15:36:52 +10002772STATIC void
Linus Torvalds1da177e2005-04-16 15:20:36 -07002773xfs_qm_freelist_destroy(xfs_frlist_t *ql)
2774{
2775 xfs_dquot_t *dqp, *nextdqp;
2776
Jes Sorensen794ee1b2006-01-09 15:59:21 -08002777 mutex_lock(&ql->qh_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002778 for (dqp = ql->qh_next;
2779 dqp != (xfs_dquot_t *)ql; ) {
2780 xfs_dqlock(dqp);
2781 nextdqp = dqp->dq_flnext;
2782#ifdef QUOTADEBUG
2783 cmn_err(CE_DEBUG, "FREELIST destroy 0x%p", dqp);
2784#endif
2785 XQM_FREELIST_REMOVE(dqp);
2786 xfs_dqunlock(dqp);
2787 xfs_qm_dqdestroy(dqp);
2788 dqp = nextdqp;
2789 }
2790 /*
2791 * Don't bother about unlocking.
2792 */
2793 mutex_destroy(&ql->qh_lock);
2794
2795 ASSERT(ql->qh_nelems == 0);
2796}
2797
Christoph Hellwigba0f32d2005-06-21 15:36:52 +10002798STATIC void
Linus Torvalds1da177e2005-04-16 15:20:36 -07002799xfs_qm_freelist_insert(xfs_frlist_t *ql, xfs_dquot_t *dq)
2800{
2801 dq->dq_flnext = ql->qh_next;
2802 dq->dq_flprev = (xfs_dquot_t *)ql;
2803 ql->qh_next = dq;
2804 dq->dq_flnext->dq_flprev = dq;
2805 xfs_Gqm->qm_dqfreelist.qh_nelems++;
2806 xfs_Gqm->qm_dqfreelist.qh_version++;
2807}
2808
2809void
2810xfs_qm_freelist_unlink(xfs_dquot_t *dq)
2811{
2812 xfs_dquot_t *next = dq->dq_flnext;
2813 xfs_dquot_t *prev = dq->dq_flprev;
2814
2815 next->dq_flprev = prev;
2816 prev->dq_flnext = next;
2817 dq->dq_flnext = dq->dq_flprev = dq;
2818 xfs_Gqm->qm_dqfreelist.qh_nelems--;
2819 xfs_Gqm->qm_dqfreelist.qh_version++;
2820}
2821
2822void
2823xfs_qm_freelist_append(xfs_frlist_t *ql, xfs_dquot_t *dq)
2824{
2825 xfs_qm_freelist_insert((xfs_frlist_t *)ql->qh_prev, dq);
2826}
2827
Christoph Hellwigba0f32d2005-06-21 15:36:52 +10002828STATIC int
Linus Torvalds1da177e2005-04-16 15:20:36 -07002829xfs_qm_dqhashlock_nowait(
2830 xfs_dquot_t *dqp)
2831{
2832 int locked;
2833
2834 locked = mutex_trylock(&((dqp)->q_hash->qh_lock));
2835 return (locked);
2836}
2837
2838int
2839xfs_qm_freelist_lock_nowait(
2840 xfs_qm_t *xqm)
2841{
2842 int locked;
2843
2844 locked = mutex_trylock(&(xqm->qm_dqfreelist.qh_lock));
2845 return (locked);
2846}
2847
Christoph Hellwigba0f32d2005-06-21 15:36:52 +10002848STATIC int
Linus Torvalds1da177e2005-04-16 15:20:36 -07002849xfs_qm_mplist_nowait(
2850 xfs_mount_t *mp)
2851{
2852 int locked;
2853
2854 ASSERT(mp->m_quotainfo);
2855 locked = mutex_trylock(&(XFS_QI_MPLLOCK(mp)));
2856 return (locked);
2857}