kern_alq.c revision 180196
1139804Simp/*- 2103785Sjeff * Copyright (c) 2002, Jeffrey Roberson <jeff@freebsd.org> 3103785Sjeff * All rights reserved. 4103785Sjeff * 5103785Sjeff * Redistribution and use in source and binary forms, with or without 6103785Sjeff * modification, are permitted provided that the following conditions 7103785Sjeff * are met: 8103785Sjeff * 1. Redistributions of source code must retain the above copyright 9103785Sjeff * notice unmodified, this list of conditions, and the following 10103785Sjeff * disclaimer. 11103785Sjeff * 2. Redistributions in binary form must reproduce the above copyright 12103785Sjeff * notice, this list of conditions and the following disclaimer in the 13103785Sjeff * documentation and/or other materials provided with the distribution. 14103785Sjeff * 15103785Sjeff * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16103785Sjeff * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17103785Sjeff * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18103785Sjeff * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19103785Sjeff * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20103785Sjeff * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21103785Sjeff * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22103785Sjeff * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23103785Sjeff * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24103785Sjeff * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25103785Sjeff */ 26103785Sjeff 27116182Sobrien#include <sys/cdefs.h> 28116182Sobrien__FBSDID("$FreeBSD: head/sys/kern/kern_alq.c 180196 2008-07-02 20:44:33Z rdivacky $"); 29116182Sobrien 30121508Srwatson#include "opt_mac.h" 31121508Srwatson 32103785Sjeff#include <sys/param.h> 33103785Sjeff#include <sys/systm.h> 34103785Sjeff#include <sys/kernel.h> 35103785Sjeff#include <sys/kthread.h> 36103785Sjeff#include <sys/lock.h> 37157233Sjhb#include <sys/mount.h> 38103785Sjeff#include <sys/mutex.h> 39103785Sjeff#include <sys/namei.h> 40103785Sjeff#include <sys/proc.h> 41103785Sjeff#include <sys/vnode.h> 42103785Sjeff#include <sys/alq.h> 43103785Sjeff#include <sys/malloc.h> 44103785Sjeff#include <sys/unistd.h> 45103785Sjeff#include <sys/fcntl.h> 46103785Sjeff#include <sys/eventhandler.h> 47103785Sjeff 48163606Srwatson#include <security/mac/mac_framework.h> 49163606Srwatson 50103785Sjeff/* Async. Logging Queue */ 51103785Sjeffstruct alq { 52103785Sjeff int aq_entmax; /* Max entries */ 53103785Sjeff int aq_entlen; /* Entry length */ 54103785Sjeff char *aq_entbuf; /* Buffer for stored entries */ 55103785Sjeff int aq_flags; /* Queue flags */ 56103785Sjeff struct mtx aq_mtx; /* Queue lock */ 57103785Sjeff struct vnode *aq_vp; /* Open vnode handle */ 58103830Sjeff struct ucred *aq_cred; /* Credentials of the opening thread */ 59103785Sjeff struct ale *aq_first; /* First ent */ 60103785Sjeff struct ale *aq_entfree; /* First free ent */ 61103785Sjeff struct ale *aq_entvalid; /* First ent valid for writing */ 62103785Sjeff LIST_ENTRY(alq) aq_act; /* List of active queues */ 63103785Sjeff LIST_ENTRY(alq) aq_link; /* List of all queues */ 64103785Sjeff}; 65103785Sjeff 66103785Sjeff#define AQ_WANTED 0x0001 /* Wakeup sleeper when io is done */ 67103785Sjeff#define AQ_ACTIVE 0x0002 /* on the active list */ 68103785Sjeff#define AQ_FLUSHING 0x0004 /* doing IO */ 69103785Sjeff#define AQ_SHUTDOWN 0x0008 /* Queue no longer valid */ 70103785Sjeff 71103785Sjeff#define ALQ_LOCK(alq) mtx_lock_spin(&(alq)->aq_mtx) 72103785Sjeff#define ALQ_UNLOCK(alq) mtx_unlock_spin(&(alq)->aq_mtx) 73103785Sjeff 74103785Sjeffstatic MALLOC_DEFINE(M_ALD, "ALD", "ALD"); 75103785Sjeff 76103785Sjeff/* 77103785Sjeff * The ald_mtx protects the ald_queues list and the ald_active list. 78103785Sjeff */ 79103785Sjeffstatic struct mtx ald_mtx; 80103785Sjeffstatic LIST_HEAD(, alq) ald_queues; 81103785Sjeffstatic LIST_HEAD(, alq) ald_active; 82103785Sjeffstatic int ald_shutingdown = 0; 83103995Sjeffstruct thread *ald_thread; 84103995Sjeffstatic struct proc *ald_proc; 85103785Sjeff 86103785Sjeff#define ALD_LOCK() mtx_lock(&ald_mtx) 87103785Sjeff#define ALD_UNLOCK() mtx_unlock(&ald_mtx) 88103785Sjeff 89103785Sjeff/* Daemon functions */ 90103785Sjeffstatic int ald_add(struct alq *); 91103785Sjeffstatic int ald_rem(struct alq *); 92103785Sjeffstatic void ald_startup(void *); 93103785Sjeffstatic void ald_daemon(void); 94103785Sjeffstatic void ald_shutdown(void *, int); 95103785Sjeffstatic void ald_activate(struct alq *); 96103785Sjeffstatic void ald_deactivate(struct alq *); 97103785Sjeff 98103785Sjeff/* Internal queue functions */ 99103785Sjeffstatic void alq_shutdown(struct alq *); 100103785Sjeffstatic int alq_doio(struct alq *); 101103785Sjeff 102103785Sjeff 103103785Sjeff/* 104103785Sjeff * Add a new queue to the global list. Fail if we're shutting down. 105103785Sjeff */ 106103785Sjeffstatic int 107103785Sjeffald_add(struct alq *alq) 108103785Sjeff{ 109103785Sjeff int error; 110103785Sjeff 111103785Sjeff error = 0; 112103785Sjeff 113103785Sjeff ALD_LOCK(); 114103785Sjeff if (ald_shutingdown) { 115103785Sjeff error = EBUSY; 116103785Sjeff goto done; 117103785Sjeff } 118103785Sjeff LIST_INSERT_HEAD(&ald_queues, alq, aq_link); 119103785Sjeffdone: 120103785Sjeff ALD_UNLOCK(); 121103785Sjeff return (error); 122103785Sjeff} 123103785Sjeff 124103785Sjeff/* 125103785Sjeff * Remove a queue from the global list unless we're shutting down. If so, 126103785Sjeff * the ald will take care of cleaning up it's resources. 127103785Sjeff */ 128103785Sjeffstatic int 129103785Sjeffald_rem(struct alq *alq) 130103785Sjeff{ 131103785Sjeff int error; 132103785Sjeff 133103785Sjeff error = 0; 134103785Sjeff 135103785Sjeff ALD_LOCK(); 136103785Sjeff if (ald_shutingdown) { 137103785Sjeff error = EBUSY; 138103785Sjeff goto done; 139103785Sjeff } 140103785Sjeff LIST_REMOVE(alq, aq_link); 141103785Sjeffdone: 142103785Sjeff ALD_UNLOCK(); 143103785Sjeff return (error); 144103785Sjeff} 145103785Sjeff 146103785Sjeff/* 147103785Sjeff * Put a queue on the active list. This will schedule it for writing. 148103785Sjeff */ 149103785Sjeffstatic void 150103785Sjeffald_activate(struct alq *alq) 151103785Sjeff{ 152103785Sjeff LIST_INSERT_HEAD(&ald_active, alq, aq_act); 153103785Sjeff wakeup(&ald_active); 154103785Sjeff} 155103785Sjeff 156103785Sjeffstatic void 157103785Sjeffald_deactivate(struct alq *alq) 158103785Sjeff{ 159103785Sjeff LIST_REMOVE(alq, aq_act); 160103785Sjeff alq->aq_flags &= ~AQ_ACTIVE; 161103785Sjeff} 162103785Sjeff 163103785Sjeffstatic void 164103785Sjeffald_startup(void *unused) 165103785Sjeff{ 166103785Sjeff mtx_init(&ald_mtx, "ALDmtx", NULL, MTX_DEF|MTX_QUIET); 167103785Sjeff LIST_INIT(&ald_queues); 168103785Sjeff LIST_INIT(&ald_active); 169103785Sjeff} 170103785Sjeff 171103785Sjeffstatic void 172103785Sjeffald_daemon(void) 173103785Sjeff{ 174103785Sjeff int needwakeup; 175103785Sjeff struct alq *alq; 176103785Sjeff 177103995Sjeff ald_thread = FIRST_THREAD_IN_PROC(ald_proc); 178103995Sjeff 179103785Sjeff EVENTHANDLER_REGISTER(shutdown_pre_sync, ald_shutdown, NULL, 180103785Sjeff SHUTDOWN_PRI_FIRST); 181103785Sjeff 182103785Sjeff ALD_LOCK(); 183103785Sjeff 184103785Sjeff for (;;) { 185103785Sjeff while ((alq = LIST_FIRST(&ald_active)) == NULL) 186103785Sjeff msleep(&ald_active, &ald_mtx, PWAIT, "aldslp", 0); 187103785Sjeff 188103785Sjeff ALQ_LOCK(alq); 189103785Sjeff ald_deactivate(alq); 190103785Sjeff ALD_UNLOCK(); 191103785Sjeff needwakeup = alq_doio(alq); 192103785Sjeff ALQ_UNLOCK(alq); 193103785Sjeff if (needwakeup) 194103785Sjeff wakeup(alq); 195103785Sjeff ALD_LOCK(); 196103785Sjeff } 197103785Sjeff} 198103785Sjeff 199103785Sjeffstatic void 200103785Sjeffald_shutdown(void *arg, int howto) 201103785Sjeff{ 202103785Sjeff struct alq *alq; 203103785Sjeff 204103785Sjeff ALD_LOCK(); 205103785Sjeff ald_shutingdown = 1; 206103785Sjeff 207103785Sjeff while ((alq = LIST_FIRST(&ald_queues)) != NULL) { 208103785Sjeff LIST_REMOVE(alq, aq_link); 209103785Sjeff ALD_UNLOCK(); 210103785Sjeff alq_shutdown(alq); 211103785Sjeff ALD_LOCK(); 212103785Sjeff } 213103785Sjeff ALD_UNLOCK(); 214103785Sjeff} 215103785Sjeff 216103785Sjeffstatic void 217103785Sjeffalq_shutdown(struct alq *alq) 218103785Sjeff{ 219103785Sjeff ALQ_LOCK(alq); 220103785Sjeff 221103785Sjeff /* Stop any new writers. */ 222103785Sjeff alq->aq_flags |= AQ_SHUTDOWN; 223103785Sjeff 224103785Sjeff /* Drain IO */ 225103785Sjeff while (alq->aq_flags & (AQ_FLUSHING|AQ_ACTIVE)) { 226103785Sjeff alq->aq_flags |= AQ_WANTED; 227180196Srdivacky msleep_spin(alq, &alq->aq_mtx, "aldclose", 0); 228103785Sjeff } 229103785Sjeff ALQ_UNLOCK(alq); 230103785Sjeff 231103995Sjeff vn_close(alq->aq_vp, FWRITE, alq->aq_cred, 232103830Sjeff curthread); 233103830Sjeff crfree(alq->aq_cred); 234103785Sjeff} 235103785Sjeff 236103785Sjeff/* 237103785Sjeff * Flush all pending data to disk. This operation will block. 238103785Sjeff */ 239103785Sjeffstatic int 240103785Sjeffalq_doio(struct alq *alq) 241103785Sjeff{ 242103785Sjeff struct thread *td; 243103785Sjeff struct mount *mp; 244103785Sjeff struct vnode *vp; 245103785Sjeff struct uio auio; 246103785Sjeff struct iovec aiov[2]; 247103785Sjeff struct ale *ale; 248103785Sjeff struct ale *alstart; 249103785Sjeff int totlen; 250103785Sjeff int iov; 251157233Sjhb int vfslocked; 252103785Sjeff 253103785Sjeff vp = alq->aq_vp; 254103785Sjeff td = curthread; 255103785Sjeff totlen = 0; 256103785Sjeff iov = 0; 257103785Sjeff 258103785Sjeff alstart = ale = alq->aq_entvalid; 259103785Sjeff alq->aq_entvalid = NULL; 260103785Sjeff 261103785Sjeff bzero(&aiov, sizeof(aiov)); 262103785Sjeff bzero(&auio, sizeof(auio)); 263103785Sjeff 264103785Sjeff do { 265103785Sjeff if (aiov[iov].iov_base == NULL) 266103785Sjeff aiov[iov].iov_base = ale->ae_data; 267103785Sjeff aiov[iov].iov_len += alq->aq_entlen; 268103785Sjeff totlen += alq->aq_entlen; 269103785Sjeff /* Check to see if we're wrapping the buffer */ 270103785Sjeff if (ale->ae_data + alq->aq_entlen != ale->ae_next->ae_data) 271103785Sjeff iov++; 272103785Sjeff ale->ae_flags &= ~AE_VALID; 273103785Sjeff ale = ale->ae_next; 274103785Sjeff } while (ale->ae_flags & AE_VALID); 275103785Sjeff 276103785Sjeff alq->aq_flags |= AQ_FLUSHING; 277103785Sjeff ALQ_UNLOCK(alq); 278103785Sjeff 279103785Sjeff if (iov == 2 || aiov[iov].iov_base == NULL) 280103785Sjeff iov--; 281103785Sjeff 282103785Sjeff auio.uio_iov = &aiov[0]; 283103785Sjeff auio.uio_offset = 0; 284103785Sjeff auio.uio_segflg = UIO_SYSSPACE; 285103785Sjeff auio.uio_rw = UIO_WRITE; 286103785Sjeff auio.uio_iovcnt = iov + 1; 287103785Sjeff auio.uio_resid = totlen; 288103785Sjeff auio.uio_td = td; 289103785Sjeff 290103785Sjeff /* 291103785Sjeff * Do all of the junk required to write now. 292103785Sjeff */ 293157233Sjhb vfslocked = VFS_LOCK_GIANT(vp->v_mount); 294103785Sjeff vn_start_write(vp, &mp, V_WAIT); 295175202Sattilio vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 296103830Sjeff VOP_LEASE(vp, td, alq->aq_cred, LEASE_WRITE); 297121508Srwatson /* 298121508Srwatson * XXX: VOP_WRITE error checks are ignored. 299121508Srwatson */ 300121508Srwatson#ifdef MAC 301172930Srwatson if (mac_vnode_check_write(alq->aq_cred, NOCRED, vp) == 0) 302121508Srwatson#endif 303121508Srwatson VOP_WRITE(vp, &auio, IO_UNIT | IO_APPEND, alq->aq_cred); 304175294Sattilio VOP_UNLOCK(vp, 0); 305103785Sjeff vn_finished_write(mp); 306157233Sjhb VFS_UNLOCK_GIANT(vfslocked); 307103785Sjeff 308103785Sjeff ALQ_LOCK(alq); 309103785Sjeff alq->aq_flags &= ~AQ_FLUSHING; 310103785Sjeff 311103785Sjeff if (alq->aq_entfree == NULL) 312103785Sjeff alq->aq_entfree = alstart; 313103785Sjeff 314103785Sjeff if (alq->aq_flags & AQ_WANTED) { 315103785Sjeff alq->aq_flags &= ~AQ_WANTED; 316103785Sjeff return (1); 317103785Sjeff } 318103785Sjeff 319103785Sjeff return(0); 320103785Sjeff} 321103785Sjeff 322103785Sjeffstatic struct kproc_desc ald_kp = { 323103785Sjeff "ALQ Daemon", 324103785Sjeff ald_daemon, 325103995Sjeff &ald_proc 326103785Sjeff}; 327103785Sjeff 328177253SrwatsonSYSINIT(aldthread, SI_SUB_KTHREAD_IDLE, SI_ORDER_ANY, kproc_start, &ald_kp); 329177253SrwatsonSYSINIT(ald, SI_SUB_LOCK, SI_ORDER_ANY, ald_startup, NULL); 330103785Sjeff 331103785Sjeff 332103785Sjeff/* User visible queue functions */ 333103785Sjeff 334103785Sjeff/* 335103785Sjeff * Create the queue data structure, allocate the buffer, and open the file. 336103785Sjeff */ 337103785Sjeffint 338145142Srwatsonalq_open(struct alq **alqp, const char *file, struct ucred *cred, int cmode, 339145142Srwatson int size, int count) 340103785Sjeff{ 341103785Sjeff struct thread *td; 342103785Sjeff struct nameidata nd; 343103785Sjeff struct ale *ale; 344103785Sjeff struct ale *alp; 345103785Sjeff struct alq *alq; 346103785Sjeff char *bufp; 347103785Sjeff int flags; 348103785Sjeff int error; 349157233Sjhb int i, vfslocked; 350103785Sjeff 351103785Sjeff *alqp = NULL; 352103785Sjeff td = curthread; 353103785Sjeff 354157233Sjhb NDINIT(&nd, LOOKUP, NOFOLLOW | MPSAFE, UIO_SYSSPACE, file, td); 355103995Sjeff flags = FWRITE | O_NOFOLLOW | O_CREAT; 356103785Sjeff 357170183Skib error = vn_open_cred(&nd, &flags, cmode, cred, NULL); 358103785Sjeff if (error) 359103785Sjeff return (error); 360154902Spjd 361157233Sjhb vfslocked = NDHASGIANT(&nd); 362154903Spjd NDFREE(&nd, NDF_ONLY_PNBUF); 363103785Sjeff /* We just unlock so we hold a reference */ 364175294Sattilio VOP_UNLOCK(nd.ni_vp, 0); 365157233Sjhb VFS_UNLOCK_GIANT(vfslocked); 366103785Sjeff 367111119Simp alq = malloc(sizeof(*alq), M_ALD, M_WAITOK|M_ZERO); 368111119Simp alq->aq_entbuf = malloc(count * size, M_ALD, M_WAITOK|M_ZERO); 369111119Simp alq->aq_first = malloc(sizeof(*ale) * count, M_ALD, M_WAITOK|M_ZERO); 370103785Sjeff alq->aq_vp = nd.ni_vp; 371116697Srwatson alq->aq_cred = crhold(cred); 372103785Sjeff alq->aq_entmax = count; 373103785Sjeff alq->aq_entlen = size; 374103785Sjeff alq->aq_entfree = alq->aq_first; 375103785Sjeff 376103785Sjeff mtx_init(&alq->aq_mtx, "ALD Queue", NULL, MTX_SPIN|MTX_QUIET); 377103785Sjeff 378103785Sjeff bufp = alq->aq_entbuf; 379103785Sjeff ale = alq->aq_first; 380103785Sjeff alp = NULL; 381103785Sjeff 382103785Sjeff /* Match up entries with buffers */ 383103785Sjeff for (i = 0; i < count; i++) { 384103785Sjeff if (alp) 385103785Sjeff alp->ae_next = ale; 386103785Sjeff ale->ae_data = bufp; 387103785Sjeff alp = ale; 388103785Sjeff ale++; 389103785Sjeff bufp += size; 390103785Sjeff } 391103785Sjeff 392103785Sjeff alp->ae_next = alq->aq_first; 393103785Sjeff 394103785Sjeff if ((error = ald_add(alq)) != 0) 395103785Sjeff return (error); 396103785Sjeff *alqp = alq; 397103785Sjeff 398103785Sjeff return (0); 399103785Sjeff} 400103785Sjeff 401103785Sjeff/* 402103785Sjeff * Copy a new entry into the queue. If the operation would block either 403103785Sjeff * wait or return an error depending on the value of waitok. 404103785Sjeff */ 405103785Sjeffint 406103785Sjeffalq_write(struct alq *alq, void *data, int waitok) 407103785Sjeff{ 408103785Sjeff struct ale *ale; 409103785Sjeff 410103785Sjeff if ((ale = alq_get(alq, waitok)) == NULL) 411103785Sjeff return (EWOULDBLOCK); 412103785Sjeff 413103785Sjeff bcopy(data, ale->ae_data, alq->aq_entlen); 414103785Sjeff alq_post(alq, ale); 415103785Sjeff 416103785Sjeff return (0); 417103785Sjeff} 418103785Sjeff 419103785Sjeffstruct ale * 420103785Sjeffalq_get(struct alq *alq, int waitok) 421103785Sjeff{ 422103785Sjeff struct ale *ale; 423103785Sjeff struct ale *aln; 424103785Sjeff 425103785Sjeff ale = NULL; 426103785Sjeff 427103785Sjeff ALQ_LOCK(alq); 428103785Sjeff 429103785Sjeff /* Loop until we get an entry or we're shutting down */ 430103785Sjeff while ((alq->aq_flags & AQ_SHUTDOWN) == 0 && 431103785Sjeff (ale = alq->aq_entfree) == NULL && 432103785Sjeff (waitok & ALQ_WAITOK)) { 433103785Sjeff alq->aq_flags |= AQ_WANTED; 434180196Srdivacky msleep_spin(alq, &alq->aq_mtx, "alqget", 0); 435103785Sjeff } 436103785Sjeff 437103785Sjeff if (ale != NULL) { 438103785Sjeff aln = ale->ae_next; 439103785Sjeff if ((aln->ae_flags & AE_VALID) == 0) 440103785Sjeff alq->aq_entfree = aln; 441115308Sjeff else 442115308Sjeff alq->aq_entfree = NULL; 443103785Sjeff } else 444103785Sjeff ALQ_UNLOCK(alq); 445103785Sjeff 446103785Sjeff 447103785Sjeff return (ale); 448103785Sjeff} 449103785Sjeff 450103785Sjeffvoid 451103785Sjeffalq_post(struct alq *alq, struct ale *ale) 452103785Sjeff{ 453103785Sjeff int activate; 454103785Sjeff 455103785Sjeff ale->ae_flags |= AE_VALID; 456103785Sjeff 457103785Sjeff if (alq->aq_entvalid == NULL) 458103785Sjeff alq->aq_entvalid = ale; 459103785Sjeff 460103785Sjeff if ((alq->aq_flags & AQ_ACTIVE) == 0) { 461103785Sjeff alq->aq_flags |= AQ_ACTIVE; 462103785Sjeff activate = 1; 463103785Sjeff } else 464103785Sjeff activate = 0; 465103785Sjeff 466103785Sjeff ALQ_UNLOCK(alq); 467103785Sjeff if (activate) { 468103785Sjeff ALD_LOCK(); 469103785Sjeff ald_activate(alq); 470103785Sjeff ALD_UNLOCK(); 471103785Sjeff } 472103785Sjeff} 473103785Sjeff 474103785Sjeffvoid 475103785Sjeffalq_flush(struct alq *alq) 476103785Sjeff{ 477103785Sjeff int needwakeup = 0; 478103785Sjeff 479103785Sjeff ALD_LOCK(); 480103785Sjeff ALQ_LOCK(alq); 481103785Sjeff if (alq->aq_flags & AQ_ACTIVE) { 482103785Sjeff ald_deactivate(alq); 483103785Sjeff ALD_UNLOCK(); 484103785Sjeff needwakeup = alq_doio(alq); 485103785Sjeff } else 486103785Sjeff ALD_UNLOCK(); 487103785Sjeff ALQ_UNLOCK(alq); 488103785Sjeff 489103785Sjeff if (needwakeup) 490103785Sjeff wakeup(alq); 491103785Sjeff} 492103785Sjeff 493103785Sjeff/* 494103785Sjeff * Flush remaining data, close the file and free all resources. 495103785Sjeff */ 496103785Sjeffvoid 497103785Sjeffalq_close(struct alq *alq) 498103785Sjeff{ 499103785Sjeff /* 500103785Sjeff * If we're already shuting down someone else will flush and close 501103785Sjeff * the vnode. 502103785Sjeff */ 503103785Sjeff if (ald_rem(alq) != 0) 504103785Sjeff return; 505103785Sjeff 506103785Sjeff /* 507103785Sjeff * Drain all pending IO. 508103785Sjeff */ 509103785Sjeff alq_shutdown(alq); 510103785Sjeff 511103785Sjeff mtx_destroy(&alq->aq_mtx); 512103785Sjeff free(alq->aq_first, M_ALD); 513103785Sjeff free(alq->aq_entbuf, M_ALD); 514103785Sjeff free(alq, M_ALD); 515103785Sjeff} 516