vfs_aio.c

Version: - FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 1997 John S. Dyson.  All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. John S. Dyson's name may not be used to endorse or promote products
   12  *    derived from this software without specific prior written permission.
   13  *
   14  * DISCLAIMER:  This code isn't warranted to do anything useful.  Anything
   15  * bad that happens because of using this software isn't the responsibility
   16  * of the author.  This software is distributed AS-IS.
   17  */
   18 
   19 /*
   20  * This file contains support for the POSIX 1003.1B AIO/LIO facility.
   21  */
   22 
   23 #include <sys/cdefs.h>
   24 __FBSDID("$FreeBSD: releng/12.0/sys/kern/vfs_aio.c 341155 2018-11-28 17:31:34Z markj $");
   25 
   26 #include <sys/param.h>
   27 #include <sys/systm.h>
   28 #include <sys/malloc.h>
   29 #include <sys/bio.h>
   30 #include <sys/buf.h>
   31 #include <sys/capsicum.h>
   32 #include <sys/eventhandler.h>
   33 #include <sys/sysproto.h>
   34 #include <sys/filedesc.h>
   35 #include <sys/kernel.h>
   36 #include <sys/module.h>
   37 #include <sys/kthread.h>
   38 #include <sys/fcntl.h>
   39 #include <sys/file.h>
   40 #include <sys/limits.h>
   41 #include <sys/lock.h>
   42 #include <sys/mutex.h>
   43 #include <sys/unistd.h>
   44 #include <sys/posix4.h>
   45 #include <sys/proc.h>
   46 #include <sys/resourcevar.h>
   47 #include <sys/signalvar.h>
   48 #include <sys/syscallsubr.h>
   49 #include <sys/protosw.h>
   50 #include <sys/rwlock.h>
   51 #include <sys/sema.h>
   52 #include <sys/socket.h>
   53 #include <sys/socketvar.h>
   54 #include <sys/syscall.h>
   55 #include <sys/sysent.h>
   56 #include <sys/sysctl.h>
   57 #include <sys/syslog.h>
   58 #include <sys/sx.h>
   59 #include <sys/taskqueue.h>
   60 #include <sys/vnode.h>
   61 #include <sys/conf.h>
   62 #include <sys/event.h>
   63 #include <sys/mount.h>
   64 #include <geom/geom.h>
   65 
   66 #include <machine/atomic.h>
   67 
   68 #include <vm/vm.h>
   69 #include <vm/vm_page.h>
   70 #include <vm/vm_extern.h>
   71 #include <vm/pmap.h>
   72 #include <vm/vm_map.h>
   73 #include <vm/vm_object.h>
   74 #include <vm/uma.h>
   75 #include <sys/aio.h>
   76 
   77 /*
   78  * Counter for allocating reference ids to new jobs.  Wrapped to 1 on
   79  * overflow. (XXX will be removed soon.)
   80  */
   81 static u_long jobrefid;
   82 
   83 /*
   84  * Counter for aio_fsync.
   85  */
   86 static uint64_t jobseqno;
   87 
   88 #ifndef MAX_AIO_PER_PROC
   89 #define MAX_AIO_PER_PROC        32
   90 #endif
   91 
   92 #ifndef MAX_AIO_QUEUE_PER_PROC
   93 #define MAX_AIO_QUEUE_PER_PROC  256
   94 #endif
   95 
   96 #ifndef MAX_AIO_QUEUE
   97 #define MAX_AIO_QUEUE           1024 /* Bigger than MAX_AIO_QUEUE_PER_PROC */
   98 #endif
   99 
  100 #ifndef MAX_BUF_AIO
  101 #define MAX_BUF_AIO             16
  102 #endif
  103 
  104 FEATURE(aio, "Asynchronous I/O");
  105 SYSCTL_DECL(_p1003_1b);
  106 
  107 static MALLOC_DEFINE(M_LIO, "lio", "listio aio control block list");
  108 static MALLOC_DEFINE(M_AIOS, "aios", "aio_suspend aio control block list");
  109 
  110 static SYSCTL_NODE(_vfs, OID_AUTO, aio, CTLFLAG_RW, 0,
  111     "Async IO management");
  112 
  113 static int enable_aio_unsafe = 0;
  114 SYSCTL_INT(_vfs_aio, OID_AUTO, enable_unsafe, CTLFLAG_RW, &enable_aio_unsafe, 0,
  115     "Permit asynchronous IO on all file types, not just known-safe types");
  116 
  117 static unsigned int unsafe_warningcnt = 1;
  118 SYSCTL_UINT(_vfs_aio, OID_AUTO, unsafe_warningcnt, CTLFLAG_RW,
  119     &unsafe_warningcnt, 0,
  120     "Warnings that will be triggered upon failed IO requests on unsafe files");
  121 
  122 static int max_aio_procs = MAX_AIO_PROCS;
  123 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_procs, CTLFLAG_RW, &max_aio_procs, 0,
  124     "Maximum number of kernel processes to use for handling async IO ");
  125 
  126 static int num_aio_procs = 0;
  127 SYSCTL_INT(_vfs_aio, OID_AUTO, num_aio_procs, CTLFLAG_RD, &num_aio_procs, 0,
  128     "Number of presently active kernel processes for async IO");
  129 
  130 /*
  131  * The code will adjust the actual number of AIO processes towards this
  132  * number when it gets a chance.
  133  */
  134 static int target_aio_procs = TARGET_AIO_PROCS;
  135 SYSCTL_INT(_vfs_aio, OID_AUTO, target_aio_procs, CTLFLAG_RW, &target_aio_procs,
  136     0,
  137     "Preferred number of ready kernel processes for async IO");
  138 
  139 static int max_queue_count = MAX_AIO_QUEUE;
  140 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_queue, CTLFLAG_RW, &max_queue_count, 0,
  141     "Maximum number of aio requests to queue, globally");
  142 
  143 static int num_queue_count = 0;
  144 SYSCTL_INT(_vfs_aio, OID_AUTO, num_queue_count, CTLFLAG_RD, &num_queue_count, 0,
  145     "Number of queued aio requests");
  146 
  147 static int num_buf_aio = 0;
  148 SYSCTL_INT(_vfs_aio, OID_AUTO, num_buf_aio, CTLFLAG_RD, &num_buf_aio, 0,
  149     "Number of aio requests presently handled by the buf subsystem");
  150 
  151 static int num_unmapped_aio = 0;
  152 SYSCTL_INT(_vfs_aio, OID_AUTO, num_unmapped_aio, CTLFLAG_RD, &num_unmapped_aio,
  153     0,
  154     "Number of aio requests presently handled by unmapped I/O buffers");
  155 
  156 /* Number of async I/O processes in the process of being started */
  157 /* XXX This should be local to aio_aqueue() */
  158 static int num_aio_resv_start = 0;
  159 
  160 static int aiod_lifetime;
  161 SYSCTL_INT(_vfs_aio, OID_AUTO, aiod_lifetime, CTLFLAG_RW, &aiod_lifetime, 0,
  162     "Maximum lifetime for idle aiod");
  163 
  164 static int max_aio_per_proc = MAX_AIO_PER_PROC;
  165 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_per_proc, CTLFLAG_RW, &max_aio_per_proc,
  166     0,
  167     "Maximum active aio requests per process");
  168 
  169 static int max_aio_queue_per_proc = MAX_AIO_QUEUE_PER_PROC;
  170 SYSCTL_INT(_vfs_aio, OID_AUTO, max_aio_queue_per_proc, CTLFLAG_RW,
  171     &max_aio_queue_per_proc, 0,
  172     "Maximum queued aio requests per process");
  173 
  174 static int max_buf_aio = MAX_BUF_AIO;
  175 SYSCTL_INT(_vfs_aio, OID_AUTO, max_buf_aio, CTLFLAG_RW, &max_buf_aio, 0,
  176     "Maximum buf aio requests per process");
  177 
  178 /* 
  179  * Though redundant with vfs.aio.max_aio_queue_per_proc, POSIX requires
  180  * sysconf(3) to support AIO_LISTIO_MAX, and we implement that with
  181  * vfs.aio.aio_listio_max.
  182  */
  183 SYSCTL_INT(_p1003_1b, CTL_P1003_1B_AIO_LISTIO_MAX, aio_listio_max,
  184     CTLFLAG_RD | CTLFLAG_CAPRD, &max_aio_queue_per_proc,
  185     0, "Maximum aio requests for a single lio_listio call");
  186 
  187 #ifdef COMPAT_FREEBSD6
  188 typedef struct oaiocb {
  189         int     aio_fildes;             /* File descriptor */
  190         off_t   aio_offset;             /* File offset for I/O */
  191         volatile void *aio_buf;         /* I/O buffer in process space */
  192         size_t  aio_nbytes;             /* Number of bytes for I/O */
  193         struct  osigevent aio_sigevent; /* Signal to deliver */
  194         int     aio_lio_opcode;         /* LIO opcode */
  195         int     aio_reqprio;            /* Request priority -- ignored */
  196         struct  __aiocb_private _aiocb_private;
  197 } oaiocb_t;
  198 #endif
  199 
  200 /*
  201  * Below is a key of locks used to protect each member of struct kaiocb
  202  * aioliojob and kaioinfo and any backends.
  203  *
  204  * * - need not protected
  205  * a - locked by kaioinfo lock
  206  * b - locked by backend lock, the backend lock can be null in some cases,
  207  *     for example, BIO belongs to this type, in this case, proc lock is
  208  *     reused.
  209  * c - locked by aio_job_mtx, the lock for the generic file I/O backend.
  210  */
  211 
  212 /*
  213  * If the routine that services an AIO request blocks while running in an
  214  * AIO kernel process it can starve other I/O requests.  BIO requests
  215  * queued via aio_qphysio() complete in GEOM and do not use AIO kernel
  216  * processes at all.  Socket I/O requests use a separate pool of
  217  * kprocs and also force non-blocking I/O.  Other file I/O requests
  218  * use the generic fo_read/fo_write operations which can block.  The
  219  * fsync and mlock operations can also block while executing.  Ideally
  220  * none of these requests would block while executing.
  221  *
  222  * Note that the service routines cannot toggle O_NONBLOCK in the file
  223  * structure directly while handling a request due to races with
  224  * userland threads.
  225  */
  226 
  227 /* jobflags */
  228 #define KAIOCB_QUEUEING         0x01
  229 #define KAIOCB_CANCELLED        0x02
  230 #define KAIOCB_CANCELLING       0x04
  231 #define KAIOCB_CHECKSYNC        0x08
  232 #define KAIOCB_CLEARED          0x10
  233 #define KAIOCB_FINISHED         0x20
  234 
  235 /*
  236  * AIO process info
  237  */
  238 #define AIOP_FREE       0x1                     /* proc on free queue */
  239 
  240 struct aioproc {
  241         int     aioprocflags;                   /* (c) AIO proc flags */
  242         TAILQ_ENTRY(aioproc) list;              /* (c) list of processes */
  243         struct  proc *aioproc;                  /* (*) the AIO proc */
  244 };
  245 
  246 /*
  247  * data-structure for lio signal management
  248  */
  249 struct aioliojob {
  250         int     lioj_flags;                     /* (a) listio flags */
  251         int     lioj_count;                     /* (a) listio flags */
  252         int     lioj_finished_count;            /* (a) listio flags */
  253         struct  sigevent lioj_signal;           /* (a) signal on all I/O done */
  254         TAILQ_ENTRY(aioliojob) lioj_list;       /* (a) lio list */
  255         struct  knlist klist;                   /* (a) list of knotes */
  256         ksiginfo_t lioj_ksi;                    /* (a) Realtime signal info */
  257 };
  258 
  259 #define LIOJ_SIGNAL             0x1     /* signal on all done (lio) */
  260 #define LIOJ_SIGNAL_POSTED      0x2     /* signal has been posted */
  261 #define LIOJ_KEVENT_POSTED      0x4     /* kevent triggered */
  262 
  263 /*
  264  * per process aio data structure
  265  */
  266 struct kaioinfo {
  267         struct  mtx kaio_mtx;           /* the lock to protect this struct */
  268         int     kaio_flags;             /* (a) per process kaio flags */
  269         int     kaio_active_count;      /* (c) number of currently used AIOs */
  270         int     kaio_count;             /* (a) size of AIO queue */
  271         int     kaio_buffer_count;      /* (a) number of physio buffers */
  272         TAILQ_HEAD(,kaiocb) kaio_all;   /* (a) all AIOs in a process */
  273         TAILQ_HEAD(,kaiocb) kaio_done;  /* (a) done queue for process */
  274         TAILQ_HEAD(,aioliojob) kaio_liojoblist; /* (a) list of lio jobs */
  275         TAILQ_HEAD(,kaiocb) kaio_jobqueue;      /* (a) job queue for process */
  276         TAILQ_HEAD(,kaiocb) kaio_syncqueue;     /* (a) queue for aio_fsync */
  277         TAILQ_HEAD(,kaiocb) kaio_syncready;  /* (a) second q for aio_fsync */
  278         struct  task kaio_task;         /* (*) task to kick aio processes */
  279         struct  task kaio_sync_task;    /* (*) task to schedule fsync jobs */
  280 };
  281 
  282 #define AIO_LOCK(ki)            mtx_lock(&(ki)->kaio_mtx)
  283 #define AIO_UNLOCK(ki)          mtx_unlock(&(ki)->kaio_mtx)
  284 #define AIO_LOCK_ASSERT(ki, f)  mtx_assert(&(ki)->kaio_mtx, (f))
  285 #define AIO_MTX(ki)             (&(ki)->kaio_mtx)
  286 
  287 #define KAIO_RUNDOWN    0x1     /* process is being run down */
  288 #define KAIO_WAKEUP     0x2     /* wakeup process when AIO completes */
  289 
  290 /*
  291  * Operations used to interact with userland aio control blocks.
  292  * Different ABIs provide their own operations.
  293  */
  294 struct aiocb_ops {
  295         int     (*copyin)(struct aiocb *ujob, struct aiocb *kjob);
  296         long    (*fetch_status)(struct aiocb *ujob);
  297         long    (*fetch_error)(struct aiocb *ujob);
  298         int     (*store_status)(struct aiocb *ujob, long status);
  299         int     (*store_error)(struct aiocb *ujob, long error);
  300         int     (*store_kernelinfo)(struct aiocb *ujob, long jobref);
  301         int     (*store_aiocb)(struct aiocb **ujobp, struct aiocb *ujob);
  302 };
  303 
  304 static TAILQ_HEAD(,aioproc) aio_freeproc;               /* (c) Idle daemons */
  305 static struct sema aio_newproc_sem;
  306 static struct mtx aio_job_mtx;
  307 static TAILQ_HEAD(,kaiocb) aio_jobs;                    /* (c) Async job list */
  308 static struct unrhdr *aiod_unr;
  309 
  310 void            aio_init_aioinfo(struct proc *p);
  311 static int      aio_onceonly(void);
  312 static int      aio_free_entry(struct kaiocb *job);
  313 static void     aio_process_rw(struct kaiocb *job);
  314 static void     aio_process_sync(struct kaiocb *job);
  315 static void     aio_process_mlock(struct kaiocb *job);
  316 static void     aio_schedule_fsync(void *context, int pending);
  317 static int      aio_newproc(int *);
  318 int             aio_aqueue(struct thread *td, struct aiocb *ujob,
  319                     struct aioliojob *lio, int type, struct aiocb_ops *ops);
  320 static int      aio_queue_file(struct file *fp, struct kaiocb *job);
  321 static void     aio_physwakeup(struct bio *bp);
  322 static void     aio_proc_rundown(void *arg, struct proc *p);
  323 static void     aio_proc_rundown_exec(void *arg, struct proc *p,
  324                     struct image_params *imgp);
  325 static int      aio_qphysio(struct proc *p, struct kaiocb *job);
  326 static void     aio_daemon(void *param);
  327 static void     aio_bio_done_notify(struct proc *userp, struct kaiocb *job);
  328 static bool     aio_clear_cancel_function_locked(struct kaiocb *job);
  329 static int      aio_kick(struct proc *userp);
  330 static void     aio_kick_nowait(struct proc *userp);
  331 static void     aio_kick_helper(void *context, int pending);
  332 static int      filt_aioattach(struct knote *kn);
  333 static void     filt_aiodetach(struct knote *kn);
  334 static int      filt_aio(struct knote *kn, long hint);
  335 static int      filt_lioattach(struct knote *kn);
  336 static void     filt_liodetach(struct knote *kn);
  337 static int      filt_lio(struct knote *kn, long hint);
  338 
  339 /*
  340  * Zones for:
  341  *      kaio    Per process async io info
  342  *      aiop    async io process data
  343  *      aiocb   async io jobs
  344  *      aiolio  list io jobs
  345  */
  346 static uma_zone_t kaio_zone, aiop_zone, aiocb_zone, aiolio_zone;
  347 
  348 /* kqueue filters for aio */
  349 static struct filterops aio_filtops = {
  350         .f_isfd = 0,
  351         .f_attach = filt_aioattach,
  352         .f_detach = filt_aiodetach,
  353         .f_event = filt_aio,
  354 };
  355 static struct filterops lio_filtops = {
  356         .f_isfd = 0,
  357         .f_attach = filt_lioattach,
  358         .f_detach = filt_liodetach,
  359         .f_event = filt_lio
  360 };
  361 
  362 static eventhandler_tag exit_tag, exec_tag;
  363 
  364 TASKQUEUE_DEFINE_THREAD(aiod_kick);
  365 
  366 /*
  367  * Main operations function for use as a kernel module.
  368  */
  369 static int
  370 aio_modload(struct module *module, int cmd, void *arg)
  371 {
  372         int error = 0;
  373 
  374         switch (cmd) {
  375         case MOD_LOAD:
  376                 aio_onceonly();
  377                 break;
  378         case MOD_SHUTDOWN:
  379                 break;
  380         default:
  381                 error = EOPNOTSUPP;
  382                 break;
  383         }
  384         return (error);
  385 }
  386 
  387 static moduledata_t aio_mod = {
  388         "aio",
  389         &aio_modload,
  390         NULL
  391 };
  392 
  393 DECLARE_MODULE(aio, aio_mod, SI_SUB_VFS, SI_ORDER_ANY);
  394 MODULE_VERSION(aio, 1);
  395 
  396 /*
  397  * Startup initialization
  398  */
  399 static int
  400 aio_onceonly(void)
  401 {
  402 
  403         exit_tag = EVENTHANDLER_REGISTER(process_exit, aio_proc_rundown, NULL,
  404             EVENTHANDLER_PRI_ANY);
  405         exec_tag = EVENTHANDLER_REGISTER(process_exec, aio_proc_rundown_exec,
  406             NULL, EVENTHANDLER_PRI_ANY);
  407         kqueue_add_filteropts(EVFILT_AIO, &aio_filtops);
  408         kqueue_add_filteropts(EVFILT_LIO, &lio_filtops);
  409         TAILQ_INIT(&aio_freeproc);
  410         sema_init(&aio_newproc_sem, 0, "aio_new_proc");
  411         mtx_init(&aio_job_mtx, "aio_job", NULL, MTX_DEF);
  412         TAILQ_INIT(&aio_jobs);
  413         aiod_unr = new_unrhdr(1, INT_MAX, NULL);
  414         kaio_zone = uma_zcreate("AIO", sizeof(struct kaioinfo), NULL, NULL,
  415             NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
  416         aiop_zone = uma_zcreate("AIOP", sizeof(struct aioproc), NULL,
  417             NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
  418         aiocb_zone = uma_zcreate("AIOCB", sizeof(struct kaiocb), NULL, NULL,
  419             NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
  420         aiolio_zone = uma_zcreate("AIOLIO", sizeof(struct aioliojob), NULL,
  421             NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
  422         aiod_lifetime = AIOD_LIFETIME_DEFAULT;
  423         jobrefid = 1;
  424         p31b_setcfg(CTL_P1003_1B_ASYNCHRONOUS_IO, _POSIX_ASYNCHRONOUS_IO);
  425         p31b_setcfg(CTL_P1003_1B_AIO_MAX, MAX_AIO_QUEUE);
  426         p31b_setcfg(CTL_P1003_1B_AIO_PRIO_DELTA_MAX, 0);
  427 
  428         return (0);
  429 }
  430 
  431 /*
  432  * Init the per-process aioinfo structure.  The aioinfo limits are set
  433  * per-process for user limit (resource) management.
  434  */
  435 void
  436 aio_init_aioinfo(struct proc *p)
  437 {
  438         struct kaioinfo *ki;
  439 
  440         ki = uma_zalloc(kaio_zone, M_WAITOK);
  441         mtx_init(&ki->kaio_mtx, "aiomtx", NULL, MTX_DEF | MTX_NEW);
  442         ki->kaio_flags = 0;
  443         ki->kaio_active_count = 0;
  444         ki->kaio_count = 0;
  445         ki->kaio_buffer_count = 0;
  446         TAILQ_INIT(&ki->kaio_all);
  447         TAILQ_INIT(&ki->kaio_done);
  448         TAILQ_INIT(&ki->kaio_jobqueue);
  449         TAILQ_INIT(&ki->kaio_liojoblist);
  450         TAILQ_INIT(&ki->kaio_syncqueue);
  451         TAILQ_INIT(&ki->kaio_syncready);
  452         TASK_INIT(&ki->kaio_task, 0, aio_kick_helper, p);
  453         TASK_INIT(&ki->kaio_sync_task, 0, aio_schedule_fsync, ki);
  454         PROC_LOCK(p);
  455         if (p->p_aioinfo == NULL) {
  456                 p->p_aioinfo = ki;
  457                 PROC_UNLOCK(p);
  458         } else {
  459                 PROC_UNLOCK(p);
  460                 mtx_destroy(&ki->kaio_mtx);
  461                 uma_zfree(kaio_zone, ki);
  462         }
  463 
  464         while (num_aio_procs < MIN(target_aio_procs, max_aio_procs))
  465                 aio_newproc(NULL);
  466 }
  467 
  468 static int
  469 aio_sendsig(struct proc *p, struct sigevent *sigev, ksiginfo_t *ksi)
  470 {
  471         struct thread *td;
  472         int error;
  473 
  474         error = sigev_findtd(p, sigev, &td);
  475         if (error)
  476                 return (error);
  477         if (!KSI_ONQ(ksi)) {
  478                 ksiginfo_set_sigev(ksi, sigev);
  479                 ksi->ksi_code = SI_ASYNCIO;
  480                 ksi->ksi_flags |= KSI_EXT | KSI_INS;
  481                 tdsendsignal(p, td, ksi->ksi_signo, ksi);
  482         }
  483         PROC_UNLOCK(p);
  484         return (error);
  485 }
  486 
  487 /*
  488  * Free a job entry.  Wait for completion if it is currently active, but don't
  489  * delay forever.  If we delay, we return a flag that says that we have to
  490  * restart the queue scan.
  491  */
  492 static int
  493 aio_free_entry(struct kaiocb *job)
  494 {
  495         struct kaioinfo *ki;
  496         struct aioliojob *lj;
  497         struct proc *p;
  498 
  499         p = job->userproc;
  500         MPASS(curproc == p);
  501         ki = p->p_aioinfo;
  502         MPASS(ki != NULL);
  503 
  504         AIO_LOCK_ASSERT(ki, MA_OWNED);
  505         MPASS(job->jobflags & KAIOCB_FINISHED);
  506 
  507         atomic_subtract_int(&num_queue_count, 1);
  508 
  509         ki->kaio_count--;
  510         MPASS(ki->kaio_count >= 0);
  511 
  512         TAILQ_REMOVE(&ki->kaio_done, job, plist);
  513         TAILQ_REMOVE(&ki->kaio_all, job, allist);
  514 
  515         lj = job->lio;
  516         if (lj) {
  517                 lj->lioj_count--;
  518                 lj->lioj_finished_count--;
  519 
  520                 if (lj->lioj_count == 0) {
  521                         TAILQ_REMOVE(&ki->kaio_liojoblist, lj, lioj_list);
  522                         /* lio is going away, we need to destroy any knotes */
  523                         knlist_delete(&lj->klist, curthread, 1);
  524                         PROC_LOCK(p);
  525                         sigqueue_take(&lj->lioj_ksi);
  526                         PROC_UNLOCK(p);
  527                         uma_zfree(aiolio_zone, lj);
  528                 }
  529         }
  530 
  531         /* job is going away, we need to destroy any knotes */
  532         knlist_delete(&job->klist, curthread, 1);
  533         PROC_LOCK(p);
  534         sigqueue_take(&job->ksi);
  535         PROC_UNLOCK(p);
  536 
  537         AIO_UNLOCK(ki);
  538 
  539         /*
  540          * The thread argument here is used to find the owning process
  541          * and is also passed to fo_close() which may pass it to various
  542          * places such as devsw close() routines.  Because of that, we
  543          * need a thread pointer from the process owning the job that is
  544          * persistent and won't disappear out from under us or move to
  545          * another process.
  546          *
  547          * Currently, all the callers of this function call it to remove
  548          * a kaiocb from the current process' job list either via a
  549          * syscall or due to the current process calling exit() or
  550          * execve().  Thus, we know that p == curproc.  We also know that
  551          * curthread can't exit since we are curthread.
  552          *
  553          * Therefore, we use curthread as the thread to pass to
  554          * knlist_delete().  This does mean that it is possible for the
  555          * thread pointer at close time to differ from the thread pointer
  556          * at open time, but this is already true of file descriptors in
  557          * a multithreaded process.
  558          */
  559         if (job->fd_file)
  560                 fdrop(job->fd_file, curthread);
  561         crfree(job->cred);
  562         uma_zfree(aiocb_zone, job);
  563         AIO_LOCK(ki);
  564 
  565         return (0);
  566 }
  567 
  568 static void
  569 aio_proc_rundown_exec(void *arg, struct proc *p,
  570     struct image_params *imgp __unused)
  571 {
  572         aio_proc_rundown(arg, p);
  573 }
  574 
  575 static int
  576 aio_cancel_job(struct proc *p, struct kaioinfo *ki, struct kaiocb *job)
  577 {
  578         aio_cancel_fn_t *func;
  579         int cancelled;
  580 
  581         AIO_LOCK_ASSERT(ki, MA_OWNED);
  582         if (job->jobflags & (KAIOCB_CANCELLED | KAIOCB_FINISHED))
  583                 return (0);
  584         MPASS((job->jobflags & KAIOCB_CANCELLING) == 0);
  585         job->jobflags |= KAIOCB_CANCELLED;
  586 
  587         func = job->cancel_fn;
  588 
  589         /*
  590          * If there is no cancel routine, just leave the job marked as
  591          * cancelled.  The job should be in active use by a caller who
  592          * should complete it normally or when it fails to install a
  593          * cancel routine.
  594          */
  595         if (func == NULL)
  596                 return (0);
  597 
  598         /*
  599          * Set the CANCELLING flag so that aio_complete() will defer
  600          * completions of this job.  This prevents the job from being
  601          * freed out from under the cancel callback.  After the
  602          * callback any deferred completion (whether from the callback
  603          * or any other source) will be completed.
  604          */
  605         job->jobflags |= KAIOCB_CANCELLING;
  606         AIO_UNLOCK(ki);
  607         func(job);
  608         AIO_LOCK(ki);
  609         job->jobflags &= ~KAIOCB_CANCELLING;
  610         if (job->jobflags & KAIOCB_FINISHED) {
  611                 cancelled = job->uaiocb._aiocb_private.error == ECANCELED;
  612                 TAILQ_REMOVE(&ki->kaio_jobqueue, job, plist);
  613                 aio_bio_done_notify(p, job);
  614         } else {
  615                 /*
  616                  * The cancel callback might have scheduled an
  617                  * operation to cancel this request, but it is
  618                  * only counted as cancelled if the request is
  619                  * cancelled when the callback returns.
  620                  */
  621                 cancelled = 0;
  622         }
  623         return (cancelled);
  624 }
  625 
  626 /*
  627  * Rundown the jobs for a given process.
  628  */
  629 static void
  630 aio_proc_rundown(void *arg, struct proc *p)
  631 {
  632         struct kaioinfo *ki;
  633         struct aioliojob *lj;
  634         struct kaiocb *job, *jobn;
  635 
  636         KASSERT(curthread->td_proc == p,
  637             ("%s: called on non-curproc", __func__));
  638         ki = p->p_aioinfo;
  639         if (ki == NULL)
  640                 return;
  641 
  642         AIO_LOCK(ki);
  643         ki->kaio_flags |= KAIO_RUNDOWN;
  644 
  645 restart:
  646 
  647         /*
  648          * Try to cancel all pending requests. This code simulates
  649          * aio_cancel on all pending I/O requests.
  650          */
  651         TAILQ_FOREACH_SAFE(job, &ki->kaio_jobqueue, plist, jobn) {
  652                 aio_cancel_job(p, ki, job);
  653         }
  654 
  655         /* Wait for all running I/O to be finished */
  656         if (TAILQ_FIRST(&ki->kaio_jobqueue) || ki->kaio_active_count != 0) {
  657                 ki->kaio_flags |= KAIO_WAKEUP;
  658                 msleep(&p->p_aioinfo, AIO_MTX(ki), PRIBIO, "aioprn", hz);
  659                 goto restart;
  660         }
  661 
  662         /* Free all completed I/O requests. */
  663         while ((job = TAILQ_FIRST(&ki->kaio_done)) != NULL)
  664                 aio_free_entry(job);
  665 
  666         while ((lj = TAILQ_FIRST(&ki->kaio_liojoblist)) != NULL) {
  667                 if (lj->lioj_count == 0) {
  668                         TAILQ_REMOVE(&ki->kaio_liojoblist, lj, lioj_list);
  669                         knlist_delete(&lj->klist, curthread, 1);
  670                         PROC_LOCK(p);
  671                         sigqueue_take(&lj->lioj_ksi);
  672                         PROC_UNLOCK(p);
  673                         uma_zfree(aiolio_zone, lj);
  674                 } else {
  675                         panic("LIO job not cleaned up: C:%d, FC:%d\n",
  676                             lj->lioj_count, lj->lioj_finished_count);
  677                 }
  678         }
  679         AIO_UNLOCK(ki);
  680         taskqueue_drain(taskqueue_aiod_kick, &ki->kaio_task);
  681         taskqueue_drain(taskqueue_aiod_kick, &ki->kaio_sync_task);
  682         mtx_destroy(&ki->kaio_mtx);
  683         uma_zfree(kaio_zone, ki);
  684         p->p_aioinfo = NULL;
  685 }
  686 
  687 /*
  688  * Select a job to run (called by an AIO daemon).
  689  */
  690 static struct kaiocb *
  691 aio_selectjob(struct aioproc *aiop)
  692 {
  693         struct kaiocb *job;
  694         struct kaioinfo *ki;
  695         struct proc *userp;
  696 
  697         mtx_assert(&aio_job_mtx, MA_OWNED);
  698 restart:
  699         TAILQ_FOREACH(job, &aio_jobs, list) {
  700                 userp = job->userproc;
  701                 ki = userp->p_aioinfo;
  702 
  703                 if (ki->kaio_active_count < max_aio_per_proc) {
  704                         TAILQ_REMOVE(&aio_jobs, job, list);
  705                         if (!aio_clear_cancel_function(job))
  706                                 goto restart;
  707 
  708                         /* Account for currently active jobs. */
  709                         ki->kaio_active_count++;
  710                         break;
  711                 }
  712         }
  713         return (job);
  714 }
  715 
  716 /*
  717  * Move all data to a permanent storage device.  This code
  718  * simulates the fsync syscall.
  719  */
  720 static int
  721 aio_fsync_vnode(struct thread *td, struct vnode *vp)
  722 {
  723         struct mount *mp;
  724         int error;
  725 
  726         if ((error = vn_start_write(vp, &mp, V_WAIT | PCATCH)) != 0)
  727                 goto drop;
  728         vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
  729         if (vp->v_object != NULL) {
  730                 VM_OBJECT_WLOCK(vp->v_object);
  731                 vm_object_page_clean(vp->v_object, 0, 0, 0);
  732                 VM_OBJECT_WUNLOCK(vp->v_object);
  733         }
  734         error = VOP_FSYNC(vp, MNT_WAIT, td);
  735 
  736         VOP_UNLOCK(vp, 0);
  737         vn_finished_write(mp);
  738 drop:
  739         return (error);
  740 }
  741 
  742 /*
  743  * The AIO processing activity for LIO_READ/LIO_WRITE.  This is the code that
  744  * does the I/O request for the non-physio version of the operations.  The
  745  * normal vn operations are used, and this code should work in all instances
  746  * for every type of file, including pipes, sockets, fifos, and regular files.
  747  *
  748  * XXX I don't think it works well for socket, pipe, and fifo.
  749  */
  750 static void
  751 aio_process_rw(struct kaiocb *job)
  752 {
  753         struct ucred *td_savedcred;
  754         struct thread *td;
  755         struct aiocb *cb;
  756         struct file *fp;
  757         struct uio auio;
  758         struct iovec aiov;
  759         ssize_t cnt;
  760         long msgsnd_st, msgsnd_end;
  761         long msgrcv_st, msgrcv_end;
  762         long oublock_st, oublock_end;
  763         long inblock_st, inblock_end;
  764         int error;
  765 
  766         KASSERT(job->uaiocb.aio_lio_opcode == LIO_READ ||
  767             job->uaiocb.aio_lio_opcode == LIO_WRITE,
  768             ("%s: opcode %d", __func__, job->uaiocb.aio_lio_opcode));
  769 
  770         aio_switch_vmspace(job);
  771         td = curthread;
  772         td_savedcred = td->td_ucred;
  773         td->td_ucred = job->cred;
  774         cb = &job->uaiocb;
  775         fp = job->fd_file;
  776 
  777         aiov.iov_base = (void *)(uintptr_t)cb->aio_buf;
  778         aiov.iov_len = cb->aio_nbytes;
  779 
  780         auio.uio_iov = &aiov;
  781         auio.uio_iovcnt = 1;
  782         auio.uio_offset = cb->aio_offset;
  783         auio.uio_resid = cb->aio_nbytes;
  784         cnt = cb->aio_nbytes;
  785         auio.uio_segflg = UIO_USERSPACE;
  786         auio.uio_td = td;
  787 
  788         msgrcv_st = td->td_ru.ru_msgrcv;
  789         msgsnd_st = td->td_ru.ru_msgsnd;
  790         inblock_st = td->td_ru.ru_inblock;
  791         oublock_st = td->td_ru.ru_oublock;
  792 
  793         /*
  794          * aio_aqueue() acquires a reference to the file that is
  795          * released in aio_free_entry().
  796          */
  797         if (cb->aio_lio_opcode == LIO_READ) {
  798                 auio.uio_rw = UIO_READ;
  799                 if (auio.uio_resid == 0)
  800                         error = 0;
  801                 else
  802                         error = fo_read(fp, &auio, fp->f_cred, FOF_OFFSET, td);
  803         } else {
  804                 if (fp->f_type == DTYPE_VNODE)
  805                         bwillwrite();
  806                 auio.uio_rw = UIO_WRITE;
  807                 error = fo_write(fp, &auio, fp->f_cred, FOF_OFFSET, td);
  808         }
  809         msgrcv_end = td->td_ru.ru_msgrcv;
  810         msgsnd_end = td->td_ru.ru_msgsnd;
  811         inblock_end = td->td_ru.ru_inblock;
  812         oublock_end = td->td_ru.ru_oublock;
  813 
  814         job->msgrcv = msgrcv_end - msgrcv_st;
  815         job->msgsnd = msgsnd_end - msgsnd_st;
  816         job->inblock = inblock_end - inblock_st;
  817         job->outblock = oublock_end - oublock_st;
  818 
  819         if ((error) && (auio.uio_resid != cnt)) {
  820                 if (error == ERESTART || error == EINTR || error == EWOULDBLOCK)
  821                         error = 0;
  822                 if ((error == EPIPE) && (cb->aio_lio_opcode == LIO_WRITE)) {
  823                         PROC_LOCK(job->userproc);
  824                         kern_psignal(job->userproc, SIGPIPE);
  825                         PROC_UNLOCK(job->userproc);
  826                 }
  827         }
  828 
  829         cnt -= auio.uio_resid;
  830         td->td_ucred = td_savedcred;
  831         if (error)
  832                 aio_complete(job, -1, error);
  833         else
  834                 aio_complete(job, cnt, 0);
  835 }
  836 
  837 static void
  838 aio_process_sync(struct kaiocb *job)
  839 {
  840         struct thread *td = curthread;
  841         struct ucred *td_savedcred = td->td_ucred;
  842         struct file *fp = job->fd_file;
  843         int error = 0;
  844 
  845         KASSERT(job->uaiocb.aio_lio_opcode == LIO_SYNC,
  846             ("%s: opcode %d", __func__, job->uaiocb.aio_lio_opcode));
  847 
  848         td->td_ucred = job->cred;
  849         if (fp->f_vnode != NULL)
  850                 error = aio_fsync_vnode(td, fp->f_vnode);
  851         td->td_ucred = td_savedcred;
  852         if (error)
  853                 aio_complete(job, -1, error);
  854         else
  855                 aio_complete(job, 0, 0);
  856 }
  857 
  858 static void
  859 aio_process_mlock(struct kaiocb *job)
  860 {
  861         struct aiocb *cb = &job->uaiocb;
  862         int error;
  863 
  864         KASSERT(job->uaiocb.aio_lio_opcode == LIO_MLOCK,
  865             ("%s: opcode %d", __func__, job->uaiocb.aio_lio_opcode));
  866 
  867         aio_switch_vmspace(job);
  868         error = kern_mlock(job->userproc, job->cred,
  869             __DEVOLATILE(uintptr_t, cb->aio_buf), cb->aio_nbytes);
  870         aio_complete(job, error != 0 ? -1 : 0, error);
  871 }
  872 
  873 static void
  874 aio_bio_done_notify(struct proc *userp, struct kaiocb *job)
  875 {
  876         struct aioliojob *lj;
  877         struct kaioinfo *ki;
  878         struct kaiocb *sjob, *sjobn;
  879         int lj_done;
  880         bool schedule_fsync;
  881 
  882         ki = userp->p_aioinfo;
  883         AIO_LOCK_ASSERT(ki, MA_OWNED);
  884         lj = job->lio;
  885         lj_done = 0;
  886         if (lj) {
  887                 lj->lioj_finished_count++;
  888                 if (lj->lioj_count == lj->lioj_finished_count)
  889                         lj_done = 1;
  890         }
  891         TAILQ_INSERT_TAIL(&ki->kaio_done, job, plist);
  892         MPASS(job->jobflags & KAIOCB_FINISHED);
  893 
  894         if (ki->kaio_flags & KAIO_RUNDOWN)
  895                 goto notification_done;
  896 
  897         if (job->uaiocb.aio_sigevent.sigev_notify == SIGEV_SIGNAL ||
  898             job->uaiocb.aio_sigevent.sigev_notify == SIGEV_THREAD_ID)
  899                 aio_sendsig(userp, &job->uaiocb.aio_sigevent, &job->ksi);
  900 
  901         KNOTE_LOCKED(&job->klist, 1);
  902 
  903         if (lj_done) {
  904                 if (lj->lioj_signal.sigev_notify == SIGEV_KEVENT) {
  905                         lj->lioj_flags |= LIOJ_KEVENT_POSTED;
  906                         KNOTE_LOCKED(&lj->klist, 1);
  907                 }
  908                 if ((lj->lioj_flags & (LIOJ_SIGNAL|LIOJ_SIGNAL_POSTED))
  909                     == LIOJ_SIGNAL
  910                     && (lj->lioj_signal.sigev_notify == SIGEV_SIGNAL ||
  911                         lj->lioj_signal.sigev_notify == SIGEV_THREAD_ID)) {
  912                         aio_sendsig(userp, &lj->lioj_signal, &lj->lioj_ksi);
  913                         lj->lioj_flags |= LIOJ_SIGNAL_POSTED;
  914                 }
  915         }
  916 
  917 notification_done:
  918         if (job->jobflags & KAIOCB_CHECKSYNC) {
  919                 schedule_fsync = false;
  920                 TAILQ_FOREACH_SAFE(sjob, &ki->kaio_syncqueue, list, sjobn) {
  921                         if (job->fd_file != sjob->fd_file ||
  922                             job->seqno >= sjob->seqno)
  923                                 continue;
  924                         if (--sjob->pending > 0)
  925                                 continue;
  926                         TAILQ_REMOVE(&ki->kaio_syncqueue, sjob, list);
  927                         if (!aio_clear_cancel_function_locked(sjob))
  928                                 continue;
  929                         TAILQ_INSERT_TAIL(&ki->kaio_syncready, sjob, list);
  930                         schedule_fsync = true;
  931                 }
  932                 if (schedule_fsync)
  933                         taskqueue_enqueue(taskqueue_aiod_kick,
  934                             &ki->kaio_sync_task);
  935         }
  936         if (ki->kaio_flags & KAIO_WAKEUP) {
  937                 ki->kaio_flags &= ~KAIO_WAKEUP;
  938                 wakeup(&userp->p_aioinfo);
  939         }
  940 }
  941 
  942 static void
  943 aio_schedule_fsync(void *context, int pending)
  944 {
  945         struct kaioinfo *ki;
  946         struct kaiocb *job;
  947 
  948         ki = context;
  949         AIO_LOCK(ki);
  950         while (!TAILQ_EMPTY(&ki->kaio_syncready)) {
  951                 job = TAILQ_FIRST(&ki->kaio_syncready);
  952                 TAILQ_REMOVE(&ki->kaio_syncready, job, list);
  953                 AIO_UNLOCK(ki);
  954                 aio_schedule(job, aio_process_sync);
  955                 AIO_LOCK(ki);
  956         }
  957         AIO_UNLOCK(ki);
  958 }
  959 
  960 bool
  961 aio_cancel_cleared(struct kaiocb *job)
  962 {
  963 
  964         /*
  965          * The caller should hold the same queue lock held when
  966          * aio_clear_cancel_function() was called and set this flag
  967          * ensuring this check sees an up-to-date value.  However,
  968          * there is no way to assert that.
  969          */
  970         return ((job->jobflags & KAIOCB_CLEARED) != 0);
  971 }
  972 
  973 static bool
  974 aio_clear_cancel_function_locked(struct kaiocb *job)
  975 {
  976 
  977         AIO_LOCK_ASSERT(job->userproc->p_aioinfo, MA_OWNED);
  978         MPASS(job->cancel_fn != NULL);
  979         if (job->jobflags & KAIOCB_CANCELLING) {
  980                 job->jobflags |= KAIOCB_CLEARED;
  981                 return (false);
  982         }
  983         job->cancel_fn = NULL;
  984         return (true);
  985 }
  986 
  987 bool
  988 aio_clear_cancel_function(struct kaiocb *job)
  989 {
  990         struct kaioinfo *ki;
  991         bool ret;
  992 
  993         ki = job->userproc->p_aioinfo;
  994         AIO_LOCK(ki);
  995         ret = aio_clear_cancel_function_locked(job);
  996         AIO_UNLOCK(ki);
  997         return (ret);
  998 }
  999 
 1000 static bool
 1001 aio_set_cancel_function_locked(struct kaiocb *job, aio_cancel_fn_t *func)
 1002 {
 1003 
 1004         AIO_LOCK_ASSERT(job->userproc->p_aioinfo, MA_OWNED);
 1005         if (job->jobflags & KAIOCB_CANCELLED)
 1006                 return (false);
 1007         job->cancel_fn = func;
 1008         return (true);
 1009 }
 1010 
 1011 bool
 1012 aio_set_cancel_function(struct kaiocb *job, aio_cancel_fn_t *func)
 1013 {
 1014         struct kaioinfo *ki;
 1015         bool ret;
 1016 
 1017         ki = job->userproc->p_aioinfo;
 1018         AIO_LOCK(ki);
 1019         ret = aio_set_cancel_function_locked(job, func);
 1020         AIO_UNLOCK(ki);
 1021         return (ret);
 1022 }
 1023 
 1024 void
 1025 aio_complete(struct kaiocb *job, long status, int error)
 1026 {
 1027         struct kaioinfo *ki;
 1028         struct proc *userp;
 1029 
 1030         job->uaiocb._aiocb_private.error = error;
 1031         job->uaiocb._aiocb_private.status = status;
 1032 
 1033         userp = job->userproc;
 1034         ki = userp->p_aioinfo;
 1035 
 1036         AIO_LOCK(ki);
 1037         KASSERT(!(job->jobflags & KAIOCB_FINISHED),
 1038             ("duplicate aio_complete"));
 1039         job->jobflags |= KAIOCB_FINISHED;
 1040         if ((job->jobflags & (KAIOCB_QUEUEING | KAIOCB_CANCELLING)) == 0) {
 1041                 TAILQ_REMOVE(&ki->kaio_jobqueue, job, plist);
 1042                 aio_bio_done_notify(userp, job);
 1043         }
 1044         AIO_UNLOCK(ki);
 1045 }
 1046 
 1047 void
 1048 aio_cancel(struct kaiocb *job)
 1049 {
 1050 
 1051         aio_complete(job, -1, ECANCELED);
 1052 }
 1053 
 1054 void
 1055 aio_switch_vmspace(struct kaiocb *job)
 1056 {
 1057 
 1058         vmspace_switch_aio(job->userproc->p_vmspace);
 1059 }
 1060 
 1061 /*
 1062  * The AIO daemon, most of the actual work is done in aio_process_*,
 1063  * but the setup (and address space mgmt) is done in this routine.
 1064  */
 1065 static void
 1066 aio_daemon(void *_id)
 1067 {
 1068         struct kaiocb *job;
 1069         struct aioproc *aiop;
 1070         struct kaioinfo *ki;
 1071         struct proc *p;
 1072         struct vmspace *myvm;
 1073         struct thread *td = curthread;
 1074         int id = (intptr_t)_id;
 1075 
 1076         /*
 1077          * Grab an extra reference on the daemon's vmspace so that it
 1078          * doesn't get freed by jobs that switch to a different
 1079          * vmspace.
 1080          */
 1081         p = td->td_proc;
 1082         myvm = vmspace_acquire_ref(p);
 1083 
 1084         KASSERT(p->p_textvp == NULL, ("kthread has a textvp"));
 1085 
 1086         /*
 1087          * Allocate and ready the aio control info.  There is one aiop structure
 1088          * per daemon.
 1089          */
 1090         aiop = uma_zalloc(aiop_zone, M_WAITOK);
 1091         aiop->aioproc = p;
 1092         aiop->aioprocflags = 0;
 1093 
 1094         /*
 1095          * Wakeup parent process.  (Parent sleeps to keep from blasting away
 1096          * and creating too many daemons.)
 1097          */
 1098         sema_post(&aio_newproc_sem);
 1099 
 1100         mtx_lock(&aio_job_mtx);
 1101         for (;;) {
 1102                 /*
 1103                  * Take daemon off of free queue
 1104                  */
 1105                 if (aiop->aioprocflags & AIOP_FREE) {
 1106                         TAILQ_REMOVE(&aio_freeproc, aiop, list);
 1107                         aiop->aioprocflags &= ~AIOP_FREE;
 1108                 }
 1109 
 1110                 /*
 1111                  * Check for jobs.
 1112                  */
 1113                 while ((job = aio_selectjob(aiop)) != NULL) {
 1114                         mtx_unlock(&aio_job_mtx);
 1115 
 1116                         ki = job->userproc->p_aioinfo;
 1117                         job->handle_fn(job);
 1118 
 1119                         mtx_lock(&aio_job_mtx);
 1120                         /* Decrement the active job count. */
 1121                         ki->kaio_active_count--;
 1122                 }
 1123 
 1124                 /*
 1125                  * Disconnect from user address space.
 1126                  */
 1127                 if (p->p_vmspace != myvm) {
 1128                         mtx_unlock(&aio_job_mtx);
 1129                         vmspace_switch_aio(myvm);
 1130                         mtx_lock(&aio_job_mtx);
 1131                         /*
 1132                          * We have to restart to avoid race, we only sleep if
 1133                          * no job can be selected.
 1134                          */
 1135                         continue;
 1136                 }
 1137 
 1138                 mtx_assert(&aio_job_mtx, MA_OWNED);
 1139 
 1140                 TAILQ_INSERT_HEAD(&aio_freeproc, aiop, list);
 1141                 aiop->aioprocflags |= AIOP_FREE;
 1142 
 1143                 /*
 1144                  * If daemon is inactive for a long time, allow it to exit,
 1145                  * thereby freeing resources.
 1146                  */
 1147                 if (msleep(p, &aio_job_mtx, PRIBIO, "aiordy",
 1148                     aiod_lifetime) == EWOULDBLOCK && TAILQ_EMPTY(&aio_jobs) &&
 1149                     (aiop->aioprocflags & AIOP_FREE) &&
 1150                     num_aio_procs > target_aio_procs)
 1151                         break;
 1152         }
 1153         TAILQ_REMOVE(&aio_freeproc, aiop, list);
 1154         num_aio_procs--;
 1155         mtx_unlock(&aio_job_mtx);
 1156         uma_zfree(aiop_zone, aiop);
 1157         free_unr(aiod_unr, id);
 1158         vmspace_free(myvm);
 1159 
 1160         KASSERT(p->p_vmspace == myvm,
 1161             ("AIOD: bad vmspace for exiting daemon"));
 1162         KASSERT(myvm->vm_refcnt > 1,
 1163             ("AIOD: bad vm refcnt for exiting daemon: %d", myvm->vm_refcnt));
 1164         kproc_exit(0);
 1165 }
 1166 
 1167 /*
 1168  * Create a new AIO daemon. This is mostly a kernel-thread fork routine. The
 1169  * AIO daemon modifies its environment itself.
 1170  */
 1171 static int
 1172 aio_newproc(int *start)
 1173 {
 1174         int error;
 1175         struct proc *p;
 1176         int id;
 1177 
 1178         id = alloc_unr(aiod_unr);
 1179         error = kproc_create(aio_daemon, (void *)(intptr_t)id, &p,
 1180                 RFNOWAIT, 0, "aiod%d", id);
 1181         if (error == 0) {
 1182                 /*
 1183                  * Wait until daemon is started.
 1184                  */
 1185                 sema_wait(&aio_newproc_sem);
 1186                 mtx_lock(&aio_job_mtx);
 1187                 num_aio_procs++;
 1188                 if (start != NULL)
 1189                         (*start)--;
 1190                 mtx_unlock(&aio_job_mtx);
 1191         } else {
 1192                 free_unr(aiod_unr, id);
 1193         }
 1194         return (error);
 1195 }
 1196 
 1197 /*
 1198  * Try the high-performance, low-overhead physio method for eligible
 1199  * VCHR devices.  This method doesn't use an aio helper thread, and
 1200  * thus has very low overhead.
 1201  *
 1202  * Assumes that the caller, aio_aqueue(), has incremented the file
 1203  * structure's reference count, preventing its deallocation for the
 1204  * duration of this call.
 1205  */
 1206 static int
 1207 aio_qphysio(struct proc *p, struct kaiocb *job)
 1208 {
 1209         struct aiocb *cb;
 1210         struct file *fp;
 1211         struct bio *bp;
 1212         struct buf *pbuf;
 1213         struct vnode *vp;
 1214         struct cdevsw *csw;
 1215         struct cdev *dev;
 1216         struct kaioinfo *ki;
 1217         int error, ref, poff;
 1218         vm_prot_t prot;
 1219 
 1220         cb = &job->uaiocb;
 1221         fp = job->fd_file;
 1222 
 1223         if (!(cb->aio_lio_opcode == LIO_WRITE ||
 1224             cb->aio_lio_opcode == LIO_READ))
 1225                 return (-1);
 1226         if (fp == NULL || fp->f_type != DTYPE_VNODE)
 1227                 return (-1);
 1228 
 1229         vp = fp->f_vnode;
 1230         if (vp->v_type != VCHR)
 1231                 return (-1);
 1232         if (vp->v_bufobj.bo_bsize == 0)
 1233                 return (-1);
 1234         if (cb->aio_nbytes % vp->v_bufobj.bo_bsize)
 1235                 return (-1);
 1236 
 1237         ref = 0;
 1238         csw = devvn_refthread(vp, &dev, &ref);
 1239         if (csw == NULL)
 1240                 return (ENXIO);
 1241 
 1242         if ((csw->d_flags & D_DISK) == 0) {
 1243                 error = -1;
 1244                 goto unref;
 1245         }
 1246         if (cb->aio_nbytes > dev->si_iosize_max) {
 1247                 error = -1;
 1248                 goto unref;
 1249         }
 1250 
 1251         ki = p->p_aioinfo;
 1252         poff = (vm_offset_t)cb->aio_buf & PAGE_MASK;
 1253         if ((dev->si_flags & SI_UNMAPPED) && unmapped_buf_allowed) {
 1254                 if (cb->aio_nbytes > MAXPHYS) {
 1255                         error = -1;
 1256                         goto unref;
 1257                 }
 1258 
 1259                 pbuf = NULL;
 1260         } else {
 1261                 if (cb->aio_nbytes > MAXPHYS - poff) {
 1262                         error = -1;
 1263                         goto unref;
 1264                 }
 1265                 if (ki->kaio_buffer_count >= max_buf_aio) {
 1266                         error = EAGAIN;
 1267                         goto unref;
 1268                 }
 1269 
 1270                 job->pbuf = pbuf = (struct buf *)getpbuf(NULL);
 1271                 BUF_KERNPROC(pbuf);
 1272                 AIO_LOCK(ki);
 1273                 ki->kaio_buffer_count++;
 1274                 AIO_UNLOCK(ki);
 1275         }
 1276         job->bp = bp = g_alloc_bio();
 1277 
 1278         bp->bio_length = cb->aio_nbytes;
 1279         bp->bio_bcount = cb->aio_nbytes;
 1280         bp->bio_done = aio_physwakeup;
 1281         bp->bio_data = (void *)(uintptr_t)cb->aio_buf;
 1282         bp->bio_offset = cb->aio_offset;
 1283         bp->bio_cmd = cb->aio_lio_opcode == LIO_WRITE ? BIO_WRITE : BIO_READ;
 1284         bp->bio_dev = dev;
 1285         bp->bio_caller1 = (void *)job;
 1286 
 1287         prot = VM_PROT_READ;
 1288         if (cb->aio_lio_opcode == LIO_READ)
 1289                 prot |= VM_PROT_WRITE;  /* Less backwards than it looks */
 1290         job->npages = vm_fault_quick_hold_pages(&curproc->p_vmspace->vm_map,
 1291             (vm_offset_t)bp->bio_data, bp->bio_length, prot, job->pages,
 1292             nitems(job->pages));
 1293         if (job->npages < 0) {
 1294                 error = EFAULT;
 1295                 goto doerror;
 1296         }
 1297         if (pbuf != NULL) {
 1298                 pmap_qenter((vm_offset_t)pbuf->b_data,
 1299                     job->pages, job->npages);
 1300                 bp->bio_data = pbuf->b_data + poff;
 1301                 atomic_add_int(&num_buf_aio, 1);
 1302         } else {
 1303                 bp->bio_ma = job->pages;
 1304                 bp->bio_ma_n = job->npages;
 1305                 bp->bio_ma_offset = poff;
 1306                 bp->bio_data = unmapped_buf;
 1307                 bp->bio_flags |= BIO_UNMAPPED;
 1308                 atomic_add_int(&num_unmapped_aio, 1);
 1309         }
 1310 
 1311         /* Perform transfer. */
 1312         csw->d_strategy(bp);
 1313         dev_relthread(dev, ref);
 1314         return (0);
 1315 
 1316 doerror:
 1317         if (pbuf != NULL) {
 1318                 AIO_LOCK(ki);
 1319                 ki->kaio_buffer_count--;
 1320                 AIO_UNLOCK(ki);
 1321                 relpbuf(pbuf, NULL);
 1322                 job->pbuf = NULL;
 1323         }
 1324         g_destroy_bio(bp);
 1325         job->bp = NULL;
 1326 unref:
 1327         dev_relthread(dev, ref);
 1328         return (error);
 1329 }
 1330 
 1331 #ifdef COMPAT_FREEBSD6
 1332 static int
 1333 convert_old_sigevent(struct osigevent *osig, struct sigevent *nsig)
 1334 {
 1335 
 1336         /*
 1337          * Only SIGEV_NONE, SIGEV_SIGNAL, and SIGEV_KEVENT are
 1338          * supported by AIO with the old sigevent structure.
 1339          */
 1340         nsig->sigev_notify = osig->sigev_notify;
 1341         switch (nsig->sigev_notify) {
 1342         case SIGEV_NONE:
 1343                 break;
 1344         case SIGEV_SIGNAL:
 1345                 nsig->sigev_signo = osig->__sigev_u.__sigev_signo;
 1346                 break;
 1347         case SIGEV_KEVENT:
 1348                 nsig->sigev_notify_kqueue =
 1349                     osig->__sigev_u.__sigev_notify_kqueue;
 1350                 nsig->sigev_value.sival_ptr = osig->sigev_value.sival_ptr;
 1351                 break;
 1352         default:
 1353                 return (EINVAL);
 1354         }
 1355         return (0);
 1356 }
 1357 
 1358 static int
 1359 aiocb_copyin_old_sigevent(struct aiocb *ujob, struct aiocb *kjob)
 1360 {
 1361         struct oaiocb *ojob;
 1362         int error;
 1363 
 1364         bzero(kjob, sizeof(struct aiocb));
 1365         error = copyin(ujob, kjob, sizeof(struct oaiocb));
 1366         if (error)
 1367                 return (error);
 1368         ojob = (struct oaiocb *)kjob;
 1369         return (convert_old_sigevent(&ojob->aio_sigevent, &kjob->aio_sigevent));
 1370 }
 1371 #endif
 1372 
 1373 static int
 1374 aiocb_copyin(struct aiocb *ujob, struct aiocb *kjob)
 1375 {
 1376 
 1377         return (copyin(ujob, kjob, sizeof(struct aiocb)));
 1378 }
 1379 
 1380 static long
 1381 aiocb_fetch_status(struct aiocb *ujob)
 1382 {
 1383 
 1384         return (fuword(&ujob->_aiocb_private.status));
 1385 }
 1386 
 1387 static long
 1388 aiocb_fetch_error(struct aiocb *ujob)
 1389 {
 1390 
 1391         return (fuword(&ujob->_aiocb_private.error));
 1392 }
 1393 
 1394 static int
 1395 aiocb_store_status(struct aiocb *ujob, long status)
 1396 {
 1397 
 1398         return (suword(&ujob->_aiocb_private.status, status));
 1399 }
 1400 
 1401 static int
 1402 aiocb_store_error(struct aiocb *ujob, long error)
 1403 {
 1404 
 1405         return (suword(&ujob->_aiocb_private.error, error));
 1406 }
 1407 
 1408 static int
 1409 aiocb_store_kernelinfo(struct aiocb *ujob, long jobref)
 1410 {
 1411 
 1412         return (suword(&ujob->_aiocb_private.kernelinfo, jobref));
 1413 }
 1414 
 1415 static int
 1416 aiocb_store_aiocb(struct aiocb **ujobp, struct aiocb *ujob)
 1417 {
 1418 
 1419         return (suword(ujobp, (long)ujob));
 1420 }
 1421 
 1422 static struct aiocb_ops aiocb_ops = {
 1423         .copyin = aiocb_copyin,
 1424         .fetch_status = aiocb_fetch_status,
 1425         .fetch_error = aiocb_fetch_error,
 1426         .store_status = aiocb_store_status,
 1427         .store_error = aiocb_store_error,
 1428         .store_kernelinfo = aiocb_store_kernelinfo,
 1429         .store_aiocb = aiocb_store_aiocb,
 1430 };
 1431 
 1432 #ifdef COMPAT_FREEBSD6
 1433 static struct aiocb_ops aiocb_ops_osigevent = {
 1434         .copyin = aiocb_copyin_old_sigevent,
 1435         .fetch_status = aiocb_fetch_status,
 1436         .fetch_error = aiocb_fetch_error,
 1437         .store_status = aiocb_store_status,
 1438         .store_error = aiocb_store_error,
 1439         .store_kernelinfo = aiocb_store_kernelinfo,
 1440         .store_aiocb = aiocb_store_aiocb,
 1441 };
 1442 #endif
 1443 
 1444 /*
 1445  * Queue a new AIO request.  Choosing either the threaded or direct physio VCHR
 1446  * technique is done in this code.
 1447  */
 1448 int
 1449 aio_aqueue(struct thread *td, struct aiocb *ujob, struct aioliojob *lj,
 1450     int type, struct aiocb_ops *ops)
 1451 {
 1452         struct proc *p = td->td_proc;
 1453         struct file *fp;
 1454         struct kaiocb *job;
 1455         struct kaioinfo *ki;
 1456         struct kevent kev;
 1457         int opcode;
 1458         int error;
 1459         int fd, kqfd;
 1460         int jid;
 1461         u_short evflags;
 1462 
 1463         if (p->p_aioinfo == NULL)
 1464                 aio_init_aioinfo(p);
 1465 
 1466         ki = p->p_aioinfo;
 1467 
 1468         ops->store_status(ujob, -1);
 1469         ops->store_error(ujob, 0);
 1470         ops->store_kernelinfo(ujob, -1);
 1471 
 1472         if (num_queue_count >= max_queue_count ||
 1473             ki->kaio_count >= max_aio_queue_per_proc) {
 1474                 ops->store_error(ujob, EAGAIN);
 1475                 return (EAGAIN);
 1476         }
 1477 
 1478         job = uma_zalloc(aiocb_zone, M_WAITOK | M_ZERO);
 1479         knlist_init_mtx(&job->klist, AIO_MTX(ki));
 1480 
 1481         error = ops->copyin(ujob, &job->uaiocb);
 1482         if (error) {
 1483                 ops->store_error(ujob, error);
 1484                 uma_zfree(aiocb_zone, job);
 1485                 return (error);
 1486         }
 1487 
 1488         if (job->uaiocb.aio_nbytes > IOSIZE_MAX) {
 1489                 uma_zfree(aiocb_zone, job);
 1490                 return (EINVAL);
 1491         }
 1492 
 1493         if (job->uaiocb.aio_sigevent.sigev_notify != SIGEV_KEVENT &&
 1494             job->uaiocb.aio_sigevent.sigev_notify != SIGEV_SIGNAL &&
 1495             job->uaiocb.aio_sigevent.sigev_notify != SIGEV_THREAD_ID &&
 1496             job->uaiocb.aio_sigevent.sigev_notify != SIGEV_NONE) {
 1497                 ops->store_error(ujob, EINVAL);
 1498                 uma_zfree(aiocb_zone, job);
 1499                 return (EINVAL);
 1500         }
 1501 
 1502         if ((job->uaiocb.aio_sigevent.sigev_notify == SIGEV_SIGNAL ||
 1503              job->uaiocb.aio_sigevent.sigev_notify == SIGEV_THREAD_ID) &&
 1504                 !_SIG_VALID(job->uaiocb.aio_sigevent.sigev_signo)) {
 1505                 uma_zfree(aiocb_zone, job);
 1506                 return (EINVAL);
 1507         }
 1508 
 1509         ksiginfo_init(&job->ksi);
 1510 
 1511         /* Save userspace address of the job info. */
 1512         job->ujob = ujob;
 1513 
 1514         /* Get the opcode. */
 1515         if (type != LIO_NOP)
 1516                 job->uaiocb.aio_lio_opcode = type;
 1517         opcode = job->uaiocb.aio_lio_opcode;
 1518 
 1519         /*
 1520          * Validate the opcode and fetch the file object for the specified
 1521          * file descriptor.
 1522          *
 1523          * XXXRW: Moved the opcode validation up here so that we don't
 1524          * retrieve a file descriptor without knowing what the capabiltity
 1525          * should be.
 1526          */
 1527         fd = job->uaiocb.aio_fildes;
 1528         switch (opcode) {
 1529         case LIO_WRITE:
 1530                 error = fget_write(td, fd, &cap_pwrite_rights, &fp);
 1531                 break;
 1532         case LIO_READ:
 1533                 error = fget_read(td, fd, &cap_pread_rights, &fp);
 1534                 break;
 1535         case LIO_SYNC:
 1536                 error = fget(td, fd, &cap_fsync_rights, &fp);
 1537                 break;
 1538         case LIO_MLOCK:
 1539                 fp = NULL;
 1540                 break;
 1541         case LIO_NOP:
 1542                 error = fget(td, fd, &cap_no_rights, &fp);
 1543                 break;
 1544         default:
 1545                 error = EINVAL;
 1546         }
 1547         if (error) {
 1548                 uma_zfree(aiocb_zone, job);
 1549                 ops->store_error(ujob, error);
 1550                 return (error);
 1551         }
 1552 
 1553         if (opcode == LIO_SYNC && fp->f_vnode == NULL) {
 1554                 error = EINVAL;
 1555                 goto aqueue_fail;
 1556         }
 1557 
 1558         if ((opcode == LIO_READ || opcode == LIO_WRITE) &&
 1559             job->uaiocb.aio_offset < 0 &&
 1560             (fp->f_vnode == NULL || fp->f_vnode->v_type != VCHR)) {
 1561                 error = EINVAL;
 1562                 goto aqueue_fail;
 1563         }
 1564 
 1565         job->fd_file = fp;
 1566 
 1567         mtx_lock(&aio_job_mtx);
 1568         jid = jobrefid++;
 1569         job->seqno = jobseqno++;
 1570         mtx_unlock(&aio_job_mtx);
 1571         error = ops->store_kernelinfo(ujob, jid);
 1572         if (error) {
 1573                 error = EINVAL;
 1574                 goto aqueue_fail;
 1575         }
 1576         job->uaiocb._aiocb_private.kernelinfo = (void *)(intptr_t)jid;
 1577 
 1578         if (opcode == LIO_NOP) {
 1579                 fdrop(fp, td);
 1580                 uma_zfree(aiocb_zone, job);
 1581                 return (0);
 1582         }
 1583 
 1584         if (job->uaiocb.aio_sigevent.sigev_notify != SIGEV_KEVENT)
 1585                 goto no_kqueue;
 1586         evflags = job->uaiocb.aio_sigevent.sigev_notify_kevent_flags;
 1587         if ((evflags & ~(EV_CLEAR | EV_DISPATCH | EV_ONESHOT)) != 0) {
 1588                 error = EINVAL;
 1589                 goto aqueue_fail;
 1590         }
 1591         kqfd = job->uaiocb.aio_sigevent.sigev_notify_kqueue;
 1592         memset(&kev, 0, sizeof(kev));
 1593         kev.ident = (uintptr_t)job->ujob;
 1594         kev.filter = EVFILT_AIO;
 1595         kev.flags = EV_ADD | EV_ENABLE | EV_FLAG1 | evflags;
 1596         kev.data = (intptr_t)job;
 1597         kev.udata = job->uaiocb.aio_sigevent.sigev_value.sival_ptr;
 1598         error = kqfd_register(kqfd, &kev, td, 1);
 1599         if (error)
 1600                 goto aqueue_fail;
 1601 
 1602 no_kqueue:
 1603 
 1604         ops->store_error(ujob, EINPROGRESS);
 1605         job->uaiocb._aiocb_private.error = EINPROGRESS;
 1606         job->userproc = p;
 1607         job->cred = crhold(td->td_ucred);
 1608         job->jobflags = KAIOCB_QUEUEING;
 1609         job->lio = lj;
 1610 
 1611         if (opcode == LIO_MLOCK) {
 1612                 aio_schedule(job, aio_process_mlock);
 1613                 error = 0;
 1614         } else if (fp->f_ops->fo_aio_queue == NULL)
 1615                 error = aio_queue_file(fp, job);
 1616         else
 1617                 error = fo_aio_queue(fp, job);
 1618         if (error)
 1619                 goto aqueue_fail;
 1620 
 1621         AIO_LOCK(ki);
 1622         job->jobflags &= ~KAIOCB_QUEUEING;
 1623         TAILQ_INSERT_TAIL(&ki->kaio_all, job, allist);
 1624         ki->kaio_count++;
 1625         if (lj)
 1626                 lj->lioj_count++;
 1627         atomic_add_int(&num_queue_count, 1);
 1628         if (job->jobflags & KAIOCB_FINISHED) {
 1629                 /*
 1630                  * The queue callback completed the request synchronously.
 1631                  * The bulk of the completion is deferred in that case
 1632                  * until this point.
 1633                  */
 1634                 aio_bio_done_notify(p, job);
 1635         } else
 1636                 TAILQ_INSERT_TAIL(&ki->kaio_jobqueue, job, plist);
 1637         AIO_UNLOCK(ki);
 1638         return (0);
 1639 
 1640 aqueue_fail:
 1641         knlist_delete(&job->klist, curthread, 0);
 1642         if (fp)
 1643                 fdrop(fp, td);
 1644         uma_zfree(aiocb_zone, job);
 1645         ops->store_error(ujob, error);
 1646         return (error);
 1647 }
 1648 
 1649 static void
 1650 aio_cancel_daemon_job(struct kaiocb *job)
 1651 {
 1652 
 1653         mtx_lock(&aio_job_mtx);
 1654         if (!aio_cancel_cleared(job))
 1655                 TAILQ_REMOVE(&aio_jobs, job, list);
 1656         mtx_unlock(&aio_job_mtx);
 1657         aio_cancel(job);
 1658 }
 1659 
 1660 void
 1661 aio_schedule(struct kaiocb *job, aio_handle_fn_t *func)
 1662 {
 1663 
 1664         mtx_lock(&aio_job_mtx);
 1665         if (!aio_set_cancel_function(job, aio_cancel_daemon_job)) {
 1666                 mtx_unlock(&aio_job_mtx);
 1667                 aio_cancel(job);
 1668                 return;
 1669         }
 1670         job->handle_fn = func;
 1671         TAILQ_INSERT_TAIL(&aio_jobs, job, list);
 1672         aio_kick_nowait(job->userproc);
 1673         mtx_unlock(&aio_job_mtx);
 1674 }
 1675 
 1676 static void
 1677 aio_cancel_sync(struct kaiocb *job)
 1678 {
 1679         struct kaioinfo *ki;
 1680 
 1681         ki = job->userproc->p_aioinfo;
 1682         AIO_LOCK(ki);
 1683         if (!aio_cancel_cleared(job))
 1684                 TAILQ_REMOVE(&ki->kaio_syncqueue, job, list);
 1685         AIO_UNLOCK(ki);
 1686         aio_cancel(job);
 1687 }
 1688 
 1689 int
 1690 aio_queue_file(struct file *fp, struct kaiocb *job)
 1691 {
 1692         struct kaioinfo *ki;
 1693         struct kaiocb *job2;
 1694         struct vnode *vp;
 1695         struct mount *mp;
 1696         int error;
 1697         bool safe;
 1698 
 1699         ki = job->userproc->p_aioinfo;
 1700         error = aio_qphysio(job->userproc, job);
 1701         if (error >= 0)
 1702                 return (error);
 1703         safe = false;
 1704         if (fp->f_type == DTYPE_VNODE) {
 1705                 vp = fp->f_vnode;
 1706                 if (vp->v_type == VREG || vp->v_type == VDIR) {
 1707                         mp = fp->f_vnode->v_mount;
 1708                         if (mp == NULL || (mp->mnt_flag & MNT_LOCAL) != 0)
 1709                                 safe = true;
 1710                 }
 1711         }
 1712         if (!(safe || enable_aio_unsafe)) {
 1713                 counted_warning(&unsafe_warningcnt,
 1714                     "is attempting to use unsafe AIO requests");
 1715                 return (EOPNOTSUPP);
 1716         }
 1717 
 1718         switch (job->uaiocb.aio_lio_opcode) {
 1719         case LIO_READ:
 1720         case LIO_WRITE:
 1721                 aio_schedule(job, aio_process_rw);
 1722                 error = 0;
 1723                 break;
 1724         case LIO_SYNC:
 1725                 AIO_LOCK(ki);
 1726                 TAILQ_FOREACH(job2, &ki->kaio_jobqueue, plist) {
 1727                         if (job2->fd_file == job->fd_file &&
 1728                             job2->uaiocb.aio_lio_opcode != LIO_SYNC &&
 1729                             job2->seqno < job->seqno) {
 1730                                 job2->jobflags |= KAIOCB_CHECKSYNC;
 1731                                 job->pending++;
 1732                         }
 1733                 }
 1734                 if (job->pending != 0) {
 1735                         if (!aio_set_cancel_function_locked(job,
 1736                                 aio_cancel_sync)) {
 1737                                 AIO_UNLOCK(ki);
 1738                                 aio_cancel(job);
 1739                                 return (0);
 1740                         }
 1741                         TAILQ_INSERT_TAIL(&ki->kaio_syncqueue, job, list);
 1742                         AIO_UNLOCK(ki);
 1743                         return (0);
 1744                 }
 1745                 AIO_UNLOCK(ki);
 1746                 aio_schedule(job, aio_process_sync);
 1747                 error = 0;
 1748                 break;
 1749         default:
 1750                 error = EINVAL;
 1751         }
 1752         return (error);
 1753 }
 1754 
 1755 static void
 1756 aio_kick_nowait(struct proc *userp)
 1757 {
 1758         struct kaioinfo *ki = userp->p_aioinfo;
 1759         struct aioproc *aiop;
 1760 
 1761         mtx_assert(&aio_job_mtx, MA_OWNED);
 1762         if ((aiop = TAILQ_FIRST(&aio_freeproc)) != NULL) {
 1763                 TAILQ_REMOVE(&aio_freeproc, aiop, list);
 1764                 aiop->aioprocflags &= ~AIOP_FREE;
 1765                 wakeup(aiop->aioproc);
 1766         } else if (num_aio_resv_start + num_aio_procs < max_aio_procs &&
 1767             ki->kaio_active_count + num_aio_resv_start < max_aio_per_proc) {
 1768                 taskqueue_enqueue(taskqueue_aiod_kick, &ki->kaio_task);
 1769         }
 1770 }
 1771 
 1772 static int
 1773 aio_kick(struct proc *userp)
 1774 {
 1775         struct kaioinfo *ki = userp->p_aioinfo;
 1776         struct aioproc *aiop;
 1777         int error, ret = 0;
 1778 
 1779         mtx_assert(&aio_job_mtx, MA_OWNED);
 1780 retryproc:
 1781         if ((aiop = TAILQ_FIRST(&aio_freeproc)) != NULL) {
 1782                 TAILQ_REMOVE(&aio_freeproc, aiop, list);
 1783                 aiop->aioprocflags &= ~AIOP_FREE;
 1784                 wakeup(aiop->aioproc);
 1785         } else if (num_aio_resv_start + num_aio_procs < max_aio_procs &&
 1786             ki->kaio_active_count + num_aio_resv_start < max_aio_per_proc) {
 1787                 num_aio_resv_start++;
 1788                 mtx_unlock(&aio_job_mtx);
 1789                 error = aio_newproc(&num_aio_resv_start);
 1790                 mtx_lock(&aio_job_mtx);
 1791                 if (error) {
 1792                         num_aio_resv_start--;
 1793                         goto retryproc;
 1794                 }
 1795         } else {
 1796                 ret = -1;
 1797         }
 1798         return (ret);
 1799 }
 1800 
 1801 static void
 1802 aio_kick_helper(void *context, int pending)
 1803 {
 1804         struct proc *userp = context;
 1805 
 1806         mtx_lock(&aio_job_mtx);
 1807         while (--pending >= 0) {
 1808                 if (aio_kick(userp))
 1809                         break;
 1810         }
 1811         mtx_unlock(&aio_job_mtx);
 1812 }
 1813 
 1814 /*
 1815  * Support the aio_return system call, as a side-effect, kernel resources are
 1816  * released.
 1817  */
 1818 static int
 1819 kern_aio_return(struct thread *td, struct aiocb *ujob, struct aiocb_ops *ops)
 1820 {
 1821         struct proc *p = td->td_proc;
 1822         struct kaiocb *job;
 1823         struct kaioinfo *ki;
 1824         long status, error;
 1825 
 1826         ki = p->p_aioinfo;
 1827         if (ki == NULL)
 1828                 return (EINVAL);
 1829         AIO_LOCK(ki);
 1830         TAILQ_FOREACH(job, &ki->kaio_done, plist) {
 1831                 if (job->ujob == ujob)
 1832                         break;
 1833         }
 1834         if (job != NULL) {
 1835                 MPASS(job->jobflags & KAIOCB_FINISHED);
 1836                 status = job->uaiocb._aiocb_private.status;
 1837                 error = job->uaiocb._aiocb_private.error;
 1838                 td->td_retval[0] = status;
 1839                 td->td_ru.ru_oublock += job->outblock;
 1840                 td->td_ru.ru_inblock += job->inblock;
 1841                 td->td_ru.ru_msgsnd += job->msgsnd;
 1842                 td->td_ru.ru_msgrcv += job->msgrcv;
 1843                 aio_free_entry(job);
 1844                 AIO_UNLOCK(ki);
 1845                 ops->store_error(ujob, error);
 1846                 ops->store_status(ujob, status);
 1847         } else {
 1848                 error = EINVAL;
 1849                 AIO_UNLOCK(ki);
 1850         }
 1851         return (error);
 1852 }
 1853 
 1854 int
 1855 sys_aio_return(struct thread *td, struct aio_return_args *uap)
 1856 {
 1857 
 1858         return (kern_aio_return(td, uap->aiocbp, &aiocb_ops));
 1859 }
 1860 
 1861 /*
 1862  * Allow a process to wakeup when any of the I/O requests are completed.
 1863  */
 1864 static int
 1865 kern_aio_suspend(struct thread *td, int njoblist, struct aiocb **ujoblist,
 1866     struct timespec *ts)
 1867 {
 1868         struct proc *p = td->td_proc;
 1869         struct timeval atv;
 1870         struct kaioinfo *ki;
 1871         struct kaiocb *firstjob, *job;
 1872         int error, i, timo;
 1873 
 1874         timo = 0;
 1875         if (ts) {
 1876                 if (ts->tv_nsec < 0 || ts->tv_nsec >= 1000000000)
 1877                         return (EINVAL);
 1878 
 1879                 TIMESPEC_TO_TIMEVAL(&atv, ts);
 1880                 if (itimerfix(&atv))
 1881                         return (EINVAL);
 1882                 timo = tvtohz(&atv);
 1883         }
 1884 
 1885         ki = p->p_aioinfo;
 1886         if (ki == NULL)
 1887                 return (EAGAIN);
 1888 
 1889         if (njoblist == 0)
 1890                 return (0);
 1891 
 1892         AIO_LOCK(ki);
 1893         for (;;) {
 1894                 firstjob = NULL;
 1895                 error = 0;
 1896                 TAILQ_FOREACH(job, &ki->kaio_all, allist) {
 1897                         for (i = 0; i < njoblist; i++) {
 1898                                 if (job->ujob == ujoblist[i]) {
 1899                                         if (firstjob == NULL)
 1900                                                 firstjob = job;
 1901                                         if (job->jobflags & KAIOCB_FINISHED)
 1902                                                 goto RETURN;
 1903                                 }
 1904                         }
 1905                 }
 1906                 /* All tasks were finished. */
 1907                 if (firstjob == NULL)
 1908                         break;
 1909 
 1910                 ki->kaio_flags |= KAIO_WAKEUP;
 1911                 error = msleep(&p->p_aioinfo, AIO_MTX(ki), PRIBIO | PCATCH,
 1912                     "aiospn", timo);
 1913                 if (error == ERESTART)
 1914                         error = EINTR;
 1915                 if (error)
 1916                         break;
 1917         }
 1918 RETURN:
 1919         AIO_UNLOCK(ki);
 1920         return (error);
 1921 }
 1922 
 1923 int
 1924 sys_aio_suspend(struct thread *td, struct aio_suspend_args *uap)
 1925 {
 1926         struct timespec ts, *tsp;
 1927         struct aiocb **ujoblist;
 1928         int error;
 1929 
 1930         if (uap->nent < 0 || uap->nent > max_aio_queue_per_proc)
 1931                 return (EINVAL);
 1932 
 1933         if (uap->timeout) {
 1934                 /* Get timespec struct. */
 1935                 if ((error = copyin(uap->timeout, &ts, sizeof(ts))) != 0)
 1936                         return (error);
 1937                 tsp = &ts;
 1938         } else
 1939                 tsp = NULL;
 1940 
 1941         ujoblist = malloc(uap->nent * sizeof(ujoblist[0]), M_AIOS, M_WAITOK);
 1942         error = copyin(uap->aiocbp, ujoblist, uap->nent * sizeof(ujoblist[0]));
 1943         if (error == 0)
 1944                 error = kern_aio_suspend(td, uap->nent, ujoblist, tsp);
 1945         free(ujoblist, M_AIOS);
 1946         return (error);
 1947 }
 1948 
 1949 /*
 1950  * aio_cancel cancels any non-physio aio operations not currently in
 1951  * progress.
 1952  */
 1953 int
 1954 sys_aio_cancel(struct thread *td, struct aio_cancel_args *uap)
 1955 {
 1956         struct proc *p = td->td_proc;
 1957         struct kaioinfo *ki;
 1958         struct kaiocb *job, *jobn;
 1959         struct file *fp;
 1960         int error;
 1961         int cancelled = 0;
 1962         int notcancelled = 0;
 1963         struct vnode *vp;
 1964 
 1965         /* Lookup file object. */
 1966         error = fget(td, uap->fd, &cap_no_rights, &fp);
 1967         if (error)
 1968                 return (error);
 1969 
 1970         ki = p->p_aioinfo;
 1971         if (ki == NULL)
 1972                 goto done;
 1973 
 1974         if (fp->f_type == DTYPE_VNODE) {
 1975                 vp = fp->f_vnode;
 1976                 if (vn_isdisk(vp, &error)) {
 1977                         fdrop(fp, td);
 1978                         td->td_retval[0] = AIO_NOTCANCELED;
 1979                         return (0);
 1980                 }
 1981         }
 1982 
 1983         AIO_LOCK(ki);
 1984         TAILQ_FOREACH_SAFE(job, &ki->kaio_jobqueue, plist, jobn) {
 1985                 if ((uap->fd == job->uaiocb.aio_fildes) &&
 1986                     ((uap->aiocbp == NULL) ||
 1987                      (uap->aiocbp == job->ujob))) {
 1988                         if (aio_cancel_job(p, ki, job)) {
 1989                                 cancelled++;
 1990                         } else {
 1991                                 notcancelled++;
 1992                         }
 1993                         if (uap->aiocbp != NULL)
 1994                                 break;
 1995                 }
 1996         }
 1997         AIO_UNLOCK(ki);
 1998 
 1999 done:
 2000         fdrop(fp, td);
 2001 
 2002         if (uap->aiocbp != NULL) {
 2003                 if (cancelled) {
 2004                         td->td_retval[0] = AIO_CANCELED;
 2005                         return (0);
 2006                 }
 2007         }
 2008 
 2009         if (notcancelled) {
 2010                 td->td_retval[0] = AIO_NOTCANCELED;
 2011                 return (0);
 2012         }
 2013 
 2014         if (cancelled) {
 2015                 td->td_retval[0] = AIO_CANCELED;
 2016                 return (0);
 2017         }
 2018 
 2019         td->td_retval[0] = AIO_ALLDONE;
 2020 
 2021         return (0);
 2022 }
 2023 
 2024 /*
 2025  * aio_error is implemented in the kernel level for compatibility purposes
 2026  * only.  For a user mode async implementation, it would be best to do it in
 2027  * a userland subroutine.
 2028  */
 2029 static int
 2030 kern_aio_error(struct thread *td, struct aiocb *ujob, struct aiocb_ops *ops)
 2031 {
 2032         struct proc *p = td->td_proc;
 2033         struct kaiocb *job;
 2034         struct kaioinfo *ki;
 2035         int status;
 2036 
 2037         ki = p->p_aioinfo;
 2038         if (ki == NULL) {
 2039                 td->td_retval[0] = EINVAL;
 2040                 return (0);
 2041         }
 2042 
 2043         AIO_LOCK(ki);
 2044         TAILQ_FOREACH(job, &ki->kaio_all, allist) {
 2045                 if (job->ujob == ujob) {
 2046                         if (job->jobflags & KAIOCB_FINISHED)
 2047                                 td->td_retval[0] =
 2048                                         job->uaiocb._aiocb_private.error;
 2049                         else
 2050                                 td->td_retval[0] = EINPROGRESS;
 2051                         AIO_UNLOCK(ki);
 2052                         return (0);
 2053                 }
 2054         }
 2055         AIO_UNLOCK(ki);
 2056 
 2057         /*
 2058          * Hack for failure of aio_aqueue.
 2059          */
 2060         status = ops->fetch_status(ujob);
 2061         if (status == -1) {
 2062                 td->td_retval[0] = ops->fetch_error(ujob);
 2063                 return (0);
 2064         }
 2065 
 2066         td->td_retval[0] = EINVAL;
 2067         return (0);
 2068 }
 2069 
 2070 int
 2071 sys_aio_error(struct thread *td, struct aio_error_args *uap)
 2072 {
 2073 
 2074         return (kern_aio_error(td, uap->aiocbp, &aiocb_ops));
 2075 }
 2076 
 2077 /* syscall - asynchronous read from a file (REALTIME) */
 2078 #ifdef COMPAT_FREEBSD6
 2079 int
 2080 freebsd6_aio_read(struct thread *td, struct freebsd6_aio_read_args *uap)
 2081 {
 2082 
 2083         return (aio_aqueue(td, (struct aiocb *)uap->aiocbp, NULL, LIO_READ,
 2084             &aiocb_ops_osigevent));
 2085 }
 2086 #endif
 2087 
 2088 int
 2089 sys_aio_read(struct thread *td, struct aio_read_args *uap)
 2090 {
 2091 
 2092         return (aio_aqueue(td, uap->aiocbp, NULL, LIO_READ, &aiocb_ops));
 2093 }
 2094 
 2095 /* syscall - asynchronous write to a file (REALTIME) */
 2096 #ifdef COMPAT_FREEBSD6
 2097 int
 2098 freebsd6_aio_write(struct thread *td, struct freebsd6_aio_write_args *uap)
 2099 {
 2100 
 2101         return (aio_aqueue(td, (struct aiocb *)uap->aiocbp, NULL, LIO_WRITE,
 2102             &aiocb_ops_osigevent));
 2103 }
 2104 #endif
 2105 
 2106 int
 2107 sys_aio_write(struct thread *td, struct aio_write_args *uap)
 2108 {
 2109 
 2110         return (aio_aqueue(td, uap->aiocbp, NULL, LIO_WRITE, &aiocb_ops));
 2111 }
 2112 
 2113 int
 2114 sys_aio_mlock(struct thread *td, struct aio_mlock_args *uap)
 2115 {
 2116 
 2117         return (aio_aqueue(td, uap->aiocbp, NULL, LIO_MLOCK, &aiocb_ops));
 2118 }
 2119 
 2120 static int
 2121 kern_lio_listio(struct thread *td, int mode, struct aiocb * const *uacb_list,
 2122     struct aiocb **acb_list, int nent, struct sigevent *sig,
 2123     struct aiocb_ops *ops)
 2124 {
 2125         struct proc *p = td->td_proc;
 2126         struct aiocb *job;
 2127         struct kaioinfo *ki;
 2128         struct aioliojob *lj;
 2129         struct kevent kev;
 2130         int error;
 2131         int nagain, nerror;
 2132         int i;
 2133 
 2134         if ((mode != LIO_NOWAIT) && (mode != LIO_WAIT))
 2135                 return (EINVAL);
 2136 
 2137         if (nent < 0 || nent > max_aio_queue_per_proc)
 2138                 return (EINVAL);
 2139 
 2140         if (p->p_aioinfo == NULL)
 2141                 aio_init_aioinfo(p);
 2142 
 2143         ki = p->p_aioinfo;
 2144 
 2145         lj = uma_zalloc(aiolio_zone, M_WAITOK);
 2146         lj->lioj_flags = 0;
 2147         lj->lioj_count = 0;
 2148         lj->lioj_finished_count = 0;
 2149         knlist_init_mtx(&lj->klist, AIO_MTX(ki));
 2150         ksiginfo_init(&lj->lioj_ksi);
 2151 
 2152         /*
 2153          * Setup signal.
 2154          */
 2155         if (sig && (mode == LIO_NOWAIT)) {
 2156                 bcopy(sig, &lj->lioj_signal, sizeof(lj->lioj_signal));
 2157                 if (lj->lioj_signal.sigev_notify == SIGEV_KEVENT) {
 2158                         /* Assume only new style KEVENT */
 2159                         memset(&kev, 0, sizeof(kev));
 2160                         kev.filter = EVFILT_LIO;
 2161                         kev.flags = EV_ADD | EV_ENABLE | EV_FLAG1;
 2162                         kev.ident = (uintptr_t)uacb_list; /* something unique */
 2163                         kev.data = (intptr_t)lj;
 2164                         /* pass user defined sigval data */
 2165                         kev.udata = lj->lioj_signal.sigev_value.sival_ptr;
 2166                         error = kqfd_register(
 2167                             lj->lioj_signal.sigev_notify_kqueue, &kev, td, 1);
 2168                         if (error) {
 2169                                 uma_zfree(aiolio_zone, lj);
 2170                                 return (error);
 2171                         }
 2172                 } else if (lj->lioj_signal.sigev_notify == SIGEV_NONE) {
 2173                         ;
 2174                 } else if (lj->lioj_signal.sigev_notify == SIGEV_SIGNAL ||
 2175                            lj->lioj_signal.sigev_notify == SIGEV_THREAD_ID) {
 2176                                 if (!_SIG_VALID(lj->lioj_signal.sigev_signo)) {
 2177                                         uma_zfree(aiolio_zone, lj);
 2178                                         return EINVAL;
 2179                                 }
 2180                                 lj->lioj_flags |= LIOJ_SIGNAL;
 2181                 } else {
 2182                         uma_zfree(aiolio_zone, lj);
 2183                         return EINVAL;
 2184                 }
 2185         }
 2186 
 2187         AIO_LOCK(ki);
 2188         TAILQ_INSERT_TAIL(&ki->kaio_liojoblist, lj, lioj_list);
 2189         /*
 2190          * Add extra aiocb count to avoid the lio to be freed
 2191          * by other threads doing aio_waitcomplete or aio_return,
 2192          * and prevent event from being sent until we have queued
 2193          * all tasks.
 2194          */
 2195         lj->lioj_count = 1;
 2196         AIO_UNLOCK(ki);
 2197 
 2198         /*
 2199          * Get pointers to the list of I/O requests.
 2200          */
 2201         nagain = 0;
 2202         nerror = 0;
 2203         for (i = 0; i < nent; i++) {
 2204                 job = acb_list[i];
 2205                 if (job != NULL) {
 2206                         error = aio_aqueue(td, job, lj, LIO_NOP, ops);
 2207                         if (error == EAGAIN)
 2208                                 nagain++;
 2209                         else if (error != 0)
 2210                                 nerror++;
 2211                 }
 2212         }
 2213 
 2214         error = 0;
 2215         AIO_LOCK(ki);
 2216         if (mode == LIO_WAIT) {
 2217                 while (lj->lioj_count - 1 != lj->lioj_finished_count) {
 2218                         ki->kaio_flags |= KAIO_WAKEUP;
 2219                         error = msleep(&p->p_aioinfo, AIO_MTX(ki),
 2220                             PRIBIO | PCATCH, "aiospn", 0);
 2221                         if (error == ERESTART)
 2222                                 error = EINTR;
 2223                         if (error)
 2224                                 break;
 2225                 }
 2226         } else {
 2227                 if (lj->lioj_count - 1 == lj->lioj_finished_count) {
 2228                         if (lj->lioj_signal.sigev_notify == SIGEV_KEVENT) {
 2229                                 lj->lioj_flags |= LIOJ_KEVENT_POSTED;
 2230                                 KNOTE_LOCKED(&lj->klist, 1);
 2231                         }
 2232                         if ((lj->lioj_flags & (LIOJ_SIGNAL|LIOJ_SIGNAL_POSTED))
 2233                             == LIOJ_SIGNAL
 2234                             && (lj->lioj_signal.sigev_notify == SIGEV_SIGNAL ||
 2235                             lj->lioj_signal.sigev_notify == SIGEV_THREAD_ID)) {
 2236                                 aio_sendsig(p, &lj->lioj_signal,
 2237                                             &lj->lioj_ksi);
 2238                                 lj->lioj_flags |= LIOJ_SIGNAL_POSTED;
 2239                         }
 2240                 }
 2241         }
 2242         lj->lioj_count--;
 2243         if (lj->lioj_count == 0) {
 2244                 TAILQ_REMOVE(&ki->kaio_liojoblist, lj, lioj_list);
 2245                 knlist_delete(&lj->klist, curthread, 1);
 2246                 PROC_LOCK(p);
 2247                 sigqueue_take(&lj->lioj_ksi);
 2248                 PROC_UNLOCK(p);
 2249                 AIO_UNLOCK(ki);
 2250                 uma_zfree(aiolio_zone, lj);
 2251         } else
 2252                 AIO_UNLOCK(ki);
 2253 
 2254         if (nerror)
 2255                 return (EIO);
 2256         else if (nagain)
 2257                 return (EAGAIN);
 2258         else
 2259                 return (error);
 2260 }
 2261 
 2262 /* syscall - list directed I/O (REALTIME) */
 2263 #ifdef COMPAT_FREEBSD6
 2264 int
 2265 freebsd6_lio_listio(struct thread *td, struct freebsd6_lio_listio_args *uap)
 2266 {
 2267         struct aiocb **acb_list;
 2268         struct sigevent *sigp, sig;
 2269         struct osigevent osig;
 2270         int error, nent;
 2271 
 2272         if ((uap->mode != LIO_NOWAIT) && (uap->mode != LIO_WAIT))
 2273                 return (EINVAL);
 2274 
 2275         nent = uap->nent;
 2276         if (nent < 0 || nent > max_aio_queue_per_proc)
 2277                 return (EINVAL);
 2278 
 2279         if (uap->sig && (uap->mode == LIO_NOWAIT)) {
 2280                 error = copyin(uap->sig, &osig, sizeof(osig));
 2281                 if (error)
 2282                         return (error);
 2283                 error = convert_old_sigevent(&osig, &sig);
 2284                 if (error)
 2285                         return (error);
 2286                 sigp = &sig;
 2287         } else
 2288                 sigp = NULL;
 2289 
 2290         acb_list = malloc(sizeof(struct aiocb *) * nent, M_LIO, M_WAITOK);
 2291         error = copyin(uap->acb_list, acb_list, nent * sizeof(acb_list[0]));
 2292         if (error == 0)
 2293                 error = kern_lio_listio(td, uap->mode,
 2294                     (struct aiocb * const *)uap->acb_list, acb_list, nent, sigp,
 2295                     &aiocb_ops_osigevent);
 2296         free(acb_list, M_LIO);
 2297         return (error);
 2298 }
 2299 #endif
 2300 
 2301 /* syscall - list directed I/O (REALTIME) */
 2302 int
 2303 sys_lio_listio(struct thread *td, struct lio_listio_args *uap)
 2304 {
 2305         struct aiocb **acb_list;
 2306         struct sigevent *sigp, sig;
 2307         int error, nent;
 2308 
 2309         if ((uap->mode != LIO_NOWAIT) && (uap->mode != LIO_WAIT))
 2310                 return (EINVAL);
 2311 
 2312         nent = uap->nent;
 2313         if (nent < 0 || nent > max_aio_queue_per_proc)
 2314                 return (EINVAL);
 2315 
 2316         if (uap->sig && (uap->mode == LIO_NOWAIT)) {
 2317                 error = copyin(uap->sig, &sig, sizeof(sig));
 2318                 if (error)
 2319                         return (error);
 2320                 sigp = &sig;
 2321         } else
 2322                 sigp = NULL;
 2323 
 2324         acb_list = malloc(sizeof(struct aiocb *) * nent, M_LIO, M_WAITOK);
 2325         error = copyin(uap->acb_list, acb_list, nent * sizeof(acb_list[0]));
 2326         if (error == 0)
 2327                 error = kern_lio_listio(td, uap->mode, uap->acb_list, acb_list,
 2328                     nent, sigp, &aiocb_ops);
 2329         free(acb_list, M_LIO);
 2330         return (error);
 2331 }
 2332 
 2333 static void
 2334 aio_physwakeup(struct bio *bp)
 2335 {
 2336         struct kaiocb *job = (struct kaiocb *)bp->bio_caller1;
 2337         struct proc *userp;
 2338         struct kaioinfo *ki;
 2339         size_t nbytes;
 2340         int error, nblks;
 2341 
 2342         /* Release mapping into kernel space. */
 2343         userp = job->userproc;
 2344         ki = userp->p_aioinfo;
 2345         if (job->pbuf) {
 2346                 pmap_qremove((vm_offset_t)job->pbuf->b_data, job->npages);
 2347                 relpbuf(job->pbuf, NULL);
 2348                 job->pbuf = NULL;
 2349                 atomic_subtract_int(&num_buf_aio, 1);
 2350                 AIO_LOCK(ki);
 2351                 ki->kaio_buffer_count--;
 2352                 AIO_UNLOCK(ki);
 2353         } else
 2354                 atomic_subtract_int(&num_unmapped_aio, 1);
 2355         vm_page_unhold_pages(job->pages, job->npages);
 2356 
 2357         bp = job->bp;
 2358         job->bp = NULL;
 2359         nbytes = job->uaiocb.aio_nbytes - bp->bio_resid;
 2360         error = 0;
 2361         if (bp->bio_flags & BIO_ERROR)
 2362                 error = bp->bio_error;
 2363         nblks = btodb(nbytes);
 2364         if (job->uaiocb.aio_lio_opcode == LIO_WRITE)
 2365                 job->outblock += nblks;
 2366         else
 2367                 job->inblock += nblks;
 2368 
 2369         if (error)
 2370                 aio_complete(job, -1, error);
 2371         else
 2372                 aio_complete(job, nbytes, 0);
 2373 
 2374         g_destroy_bio(bp);
 2375 }
 2376 
 2377 /* syscall - wait for the next completion of an aio request */
 2378 static int
 2379 kern_aio_waitcomplete(struct thread *td, struct aiocb **ujobp,
 2380     struct timespec *ts, struct aiocb_ops *ops)
 2381 {
 2382         struct proc *p = td->td_proc;
 2383         struct timeval atv;
 2384         struct kaioinfo *ki;
 2385         struct kaiocb *job;
 2386         struct aiocb *ujob;
 2387         long error, status;
 2388         int timo;
 2389 
 2390         ops->store_aiocb(ujobp, NULL);
 2391 
 2392         if (ts == NULL) {
 2393                 timo = 0;
 2394         } else if (ts->tv_sec == 0 && ts->tv_nsec == 0) {
 2395                 timo = -1;
 2396         } else {
 2397                 if ((ts->tv_nsec < 0) || (ts->tv_nsec >= 1000000000))
 2398                         return (EINVAL);
 2399 
 2400                 TIMESPEC_TO_TIMEVAL(&atv, ts);
 2401                 if (itimerfix(&atv))
 2402                         return (EINVAL);
 2403                 timo = tvtohz(&atv);
 2404         }
 2405 
 2406         if (p->p_aioinfo == NULL)
 2407                 aio_init_aioinfo(p);
 2408         ki = p->p_aioinfo;
 2409 
 2410         error = 0;
 2411         job = NULL;
 2412         AIO_LOCK(ki);
 2413         while ((job = TAILQ_FIRST(&ki->kaio_done)) == NULL) {
 2414                 if (timo == -1) {
 2415                         error = EWOULDBLOCK;
 2416                         break;
 2417                 }
 2418                 ki->kaio_flags |= KAIO_WAKEUP;
 2419                 error = msleep(&p->p_aioinfo, AIO_MTX(ki), PRIBIO | PCATCH,
 2420                     "aiowc", timo);
 2421                 if (timo && error == ERESTART)
 2422                         error = EINTR;
 2423                 if (error)
 2424                         break;
 2425         }
 2426 
 2427         if (job != NULL) {
 2428                 MPASS(job->jobflags & KAIOCB_FINISHED);
 2429                 ujob = job->ujob;
 2430                 status = job->uaiocb._aiocb_private.status;
 2431                 error = job->uaiocb._aiocb_private.error;
 2432                 td->td_retval[0] = status;
 2433                 td->td_ru.ru_oublock += job->outblock;
 2434                 td->td_ru.ru_inblock += job->inblock;
 2435                 td->td_ru.ru_msgsnd += job->msgsnd;
 2436                 td->td_ru.ru_msgrcv += job->msgrcv;
 2437                 aio_free_entry(job);
 2438                 AIO_UNLOCK(ki);
 2439                 ops->store_aiocb(ujobp, ujob);
 2440                 ops->store_error(ujob, error);
 2441                 ops->store_status(ujob, status);
 2442         } else
 2443                 AIO_UNLOCK(ki);
 2444 
 2445         return (error);
 2446 }
 2447 
 2448 int
 2449 sys_aio_waitcomplete(struct thread *td, struct aio_waitcomplete_args *uap)
 2450 {
 2451         struct timespec ts, *tsp;
 2452         int error;
 2453 
 2454         if (uap->timeout) {
 2455                 /* Get timespec struct. */
 2456                 error = copyin(uap->timeout, &ts, sizeof(ts));
 2457                 if (error)
 2458                         return (error);
 2459                 tsp = &ts;
 2460         } else
 2461                 tsp = NULL;
 2462 
 2463         return (kern_aio_waitcomplete(td, uap->aiocbp, tsp, &aiocb_ops));
 2464 }
 2465 
 2466 static int
 2467 kern_aio_fsync(struct thread *td, int op, struct aiocb *ujob,
 2468     struct aiocb_ops *ops)
 2469 {
 2470 
 2471         if (op != O_SYNC) /* XXX lack of O_DSYNC */
 2472                 return (EINVAL);
 2473         return (aio_aqueue(td, ujob, NULL, LIO_SYNC, ops));
 2474 }
 2475 
 2476 int
 2477 sys_aio_fsync(struct thread *td, struct aio_fsync_args *uap)
 2478 {
 2479 
 2480         return (kern_aio_fsync(td, uap->op, uap->aiocbp, &aiocb_ops));
 2481 }
 2482 
 2483 /* kqueue attach function */
 2484 static int
 2485 filt_aioattach(struct knote *kn)
 2486 {
 2487         struct kaiocb *job;
 2488 
 2489         job = (struct kaiocb *)(uintptr_t)kn->kn_sdata;
 2490 
 2491         /*
 2492          * The job pointer must be validated before using it, so
 2493          * registration is restricted to the kernel; the user cannot
 2494          * set EV_FLAG1.
 2495          */
 2496         if ((kn->kn_flags & EV_FLAG1) == 0)
 2497                 return (EPERM);
 2498         kn->kn_ptr.p_aio = job;
 2499         kn->kn_flags &= ~EV_FLAG1;
 2500 
 2501         knlist_add(&job->klist, kn, 0);
 2502 
 2503         return (0);
 2504 }
 2505 
 2506 /* kqueue detach function */
 2507 static void
 2508 filt_aiodetach(struct knote *kn)
 2509 {
 2510         struct knlist *knl;
 2511 
 2512         knl = &kn->kn_ptr.p_aio->klist;
 2513         knl->kl_lock(knl->kl_lockarg);
 2514         if (!knlist_empty(knl))
 2515                 knlist_remove(knl, kn, 1);
 2516         knl->kl_unlock(knl->kl_lockarg);
 2517 }
 2518 
 2519 /* kqueue filter function */
 2520 /*ARGSUSED*/
 2521 static int
 2522 filt_aio(struct knote *kn, long hint)
 2523 {
 2524         struct kaiocb *job = kn->kn_ptr.p_aio;
 2525 
 2526         kn->kn_data = job->uaiocb._aiocb_private.error;
 2527         if (!(job->jobflags & KAIOCB_FINISHED))
 2528                 return (0);
 2529         kn->kn_flags |= EV_EOF;
 2530         return (1);
 2531 }
 2532 
 2533 /* kqueue attach function */
 2534 static int
 2535 filt_lioattach(struct knote *kn)
 2536 {
 2537         struct aioliojob *lj;
 2538 
 2539         lj = (struct aioliojob *)(uintptr_t)kn->kn_sdata;
 2540 
 2541         /*
 2542          * The aioliojob pointer must be validated before using it, so
 2543          * registration is restricted to the kernel; the user cannot
 2544          * set EV_FLAG1.
 2545          */
 2546         if ((kn->kn_flags & EV_FLAG1) == 0)
 2547                 return (EPERM);
 2548         kn->kn_ptr.p_lio = lj;
 2549         kn->kn_flags &= ~EV_FLAG1;
 2550 
 2551         knlist_add(&lj->klist, kn, 0);
 2552 
 2553         return (0);
 2554 }
 2555 
 2556 /* kqueue detach function */
 2557 static void
 2558 filt_liodetach(struct knote *kn)
 2559 {
 2560         struct knlist *knl;
 2561 
 2562         knl = &kn->kn_ptr.p_lio->klist;
 2563         knl->kl_lock(knl->kl_lockarg);
 2564         if (!knlist_empty(knl))
 2565                 knlist_remove(knl, kn, 1);
 2566         knl->kl_unlock(knl->kl_lockarg);
 2567 }
 2568 
 2569 /* kqueue filter function */
 2570 /*ARGSUSED*/
 2571 static int
 2572 filt_lio(struct knote *kn, long hint)
 2573 {
 2574         struct aioliojob * lj = kn->kn_ptr.p_lio;
 2575 
 2576         return (lj->lioj_flags & LIOJ_KEVENT_POSTED);
 2577 }
 2578 
 2579 #ifdef COMPAT_FREEBSD32
 2580 #include <sys/mount.h>
 2581 #include <sys/socket.h>
 2582 #include <compat/freebsd32/freebsd32.h>
 2583 #include <compat/freebsd32/freebsd32_proto.h>
 2584 #include <compat/freebsd32/freebsd32_signal.h>
 2585 #include <compat/freebsd32/freebsd32_syscall.h>
 2586 #include <compat/freebsd32/freebsd32_util.h>
 2587 
 2588 struct __aiocb_private32 {
 2589         int32_t status;
 2590         int32_t error;
 2591         uint32_t kernelinfo;
 2592 };
 2593 
 2594 #ifdef COMPAT_FREEBSD6
 2595 typedef struct oaiocb32 {
 2596         int     aio_fildes;             /* File descriptor */
 2597         uint64_t aio_offset __packed;   /* File offset for I/O */
 2598         uint32_t aio_buf;               /* I/O buffer in process space */
 2599         uint32_t aio_nbytes;            /* Number of bytes for I/O */
 2600         struct  osigevent32 aio_sigevent; /* Signal to deliver */
 2601         int     aio_lio_opcode;         /* LIO opcode */
 2602         int     aio_reqprio;            /* Request priority -- ignored */
 2603         struct  __aiocb_private32 _aiocb_private;
 2604 } oaiocb32_t;
 2605 #endif
 2606 
 2607 typedef struct aiocb32 {
 2608         int32_t aio_fildes;             /* File descriptor */
 2609         uint64_t aio_offset __packed;   /* File offset for I/O */
 2610         uint32_t aio_buf;               /* I/O buffer in process space */
 2611         uint32_t aio_nbytes;            /* Number of bytes for I/O */
 2612         int     __spare__[2];
 2613         uint32_t __spare2__;
 2614         int     aio_lio_opcode;         /* LIO opcode */
 2615         int     aio_reqprio;            /* Request priority -- ignored */
 2616         struct  __aiocb_private32 _aiocb_private;
 2617         struct  sigevent32 aio_sigevent;        /* Signal to deliver */
 2618 } aiocb32_t;
 2619 
 2620 #ifdef COMPAT_FREEBSD6
 2621 static int
 2622 convert_old_sigevent32(struct osigevent32 *osig, struct sigevent *nsig)
 2623 {
 2624 
 2625         /*
 2626          * Only SIGEV_NONE, SIGEV_SIGNAL, and SIGEV_KEVENT are
 2627          * supported by AIO with the old sigevent structure.
 2628          */
 2629         CP(*osig, *nsig, sigev_notify);
 2630         switch (nsig->sigev_notify) {
 2631         case SIGEV_NONE:
 2632                 break;
 2633         case SIGEV_SIGNAL:
 2634                 nsig->sigev_signo = osig->__sigev_u.__sigev_signo;
 2635                 break;
 2636         case SIGEV_KEVENT:
 2637                 nsig->sigev_notify_kqueue =
 2638                     osig->__sigev_u.__sigev_notify_kqueue;
 2639                 PTRIN_CP(*osig, *nsig, sigev_value.sival_ptr);
 2640                 break;
 2641         default:
 2642                 return (EINVAL);
 2643         }
 2644         return (0);
 2645 }
 2646 
 2647 static int
 2648 aiocb32_copyin_old_sigevent(struct aiocb *ujob, struct aiocb *kjob)
 2649 {
 2650         struct oaiocb32 job32;
 2651         int error;
 2652 
 2653         bzero(kjob, sizeof(struct aiocb));
 2654         error = copyin(ujob, &job32, sizeof(job32));
 2655         if (error)
 2656                 return (error);
 2657 
 2658         CP(job32, *kjob, aio_fildes);
 2659         CP(job32, *kjob, aio_offset);
 2660         PTRIN_CP(job32, *kjob, aio_buf);
 2661         CP(job32, *kjob, aio_nbytes);
 2662         CP(job32, *kjob, aio_lio_opcode);
 2663         CP(job32, *kjob, aio_reqprio);
 2664         CP(job32, *kjob, _aiocb_private.status);
 2665         CP(job32, *kjob, _aiocb_private.error);
 2666         PTRIN_CP(job32, *kjob, _aiocb_private.kernelinfo);
 2667         return (convert_old_sigevent32(&job32.aio_sigevent,
 2668             &kjob->aio_sigevent));
 2669 }
 2670 #endif
 2671 
 2672 static int
 2673 aiocb32_copyin(struct aiocb *ujob, struct aiocb *kjob)
 2674 {
 2675         struct aiocb32 job32;
 2676         int error;
 2677 
 2678         error = copyin(ujob, &job32, sizeof(job32));
 2679         if (error)
 2680                 return (error);
 2681         CP(job32, *kjob, aio_fildes);
 2682         CP(job32, *kjob, aio_offset);
 2683         PTRIN_CP(job32, *kjob, aio_buf);
 2684         CP(job32, *kjob, aio_nbytes);
 2685         CP(job32, *kjob, aio_lio_opcode);
 2686         CP(job32, *kjob, aio_reqprio);
 2687         CP(job32, *kjob, _aiocb_private.status);
 2688         CP(job32, *kjob, _aiocb_private.error);
 2689         PTRIN_CP(job32, *kjob, _aiocb_private.kernelinfo);
 2690         return (convert_sigevent32(&job32.aio_sigevent, &kjob->aio_sigevent));
 2691 }
 2692 
 2693 static long
 2694 aiocb32_fetch_status(struct aiocb *ujob)
 2695 {
 2696         struct aiocb32 *ujob32;
 2697 
 2698         ujob32 = (struct aiocb32 *)ujob;
 2699         return (fuword32(&ujob32->_aiocb_private.status));
 2700 }
 2701 
 2702 static long
 2703 aiocb32_fetch_error(struct aiocb *ujob)
 2704 {
 2705         struct aiocb32 *ujob32;
 2706 
 2707         ujob32 = (struct aiocb32 *)ujob;
 2708         return (fuword32(&ujob32->_aiocb_private.error));
 2709 }
 2710 
 2711 static int
 2712 aiocb32_store_status(struct aiocb *ujob, long status)
 2713 {
 2714         struct aiocb32 *ujob32;
 2715 
 2716         ujob32 = (struct aiocb32 *)ujob;
 2717         return (suword32(&ujob32->_aiocb_private.status, status));
 2718 }
 2719 
 2720 static int
 2721 aiocb32_store_error(struct aiocb *ujob, long error)
 2722 {
 2723         struct aiocb32 *ujob32;
 2724 
 2725         ujob32 = (struct aiocb32 *)ujob;
 2726         return (suword32(&ujob32->_aiocb_private.error, error));
 2727 }
 2728 
 2729 static int
 2730 aiocb32_store_kernelinfo(struct aiocb *ujob, long jobref)
 2731 {
 2732         struct aiocb32 *ujob32;
 2733 
 2734         ujob32 = (struct aiocb32 *)ujob;
 2735         return (suword32(&ujob32->_aiocb_private.kernelinfo, jobref));
 2736 }
 2737 
 2738 static int
 2739 aiocb32_store_aiocb(struct aiocb **ujobp, struct aiocb *ujob)
 2740 {
 2741 
 2742         return (suword32(ujobp, (long)ujob));
 2743 }
 2744 
 2745 static struct aiocb_ops aiocb32_ops = {
 2746         .copyin = aiocb32_copyin,
 2747         .fetch_status = aiocb32_fetch_status,
 2748         .fetch_error = aiocb32_fetch_error,
 2749         .store_status = aiocb32_store_status,
 2750         .store_error = aiocb32_store_error,
 2751         .store_kernelinfo = aiocb32_store_kernelinfo,
 2752         .store_aiocb = aiocb32_store_aiocb,
 2753 };
 2754 
 2755 #ifdef COMPAT_FREEBSD6
 2756 static struct aiocb_ops aiocb32_ops_osigevent = {
 2757         .copyin = aiocb32_copyin_old_sigevent,
 2758         .fetch_status = aiocb32_fetch_status,
 2759         .fetch_error = aiocb32_fetch_error,
 2760         .store_status = aiocb32_store_status,
 2761         .store_error = aiocb32_store_error,
 2762         .store_kernelinfo = aiocb32_store_kernelinfo,
 2763         .store_aiocb = aiocb32_store_aiocb,
 2764 };
 2765 #endif
 2766 
 2767 int
 2768 freebsd32_aio_return(struct thread *td, struct freebsd32_aio_return_args *uap)
 2769 {
 2770 
 2771         return (kern_aio_return(td, (struct aiocb *)uap->aiocbp, &aiocb32_ops));
 2772 }
 2773 
 2774 int
 2775 freebsd32_aio_suspend(struct thread *td, struct freebsd32_aio_suspend_args *uap)
 2776 {
 2777         struct timespec32 ts32;
 2778         struct timespec ts, *tsp;
 2779         struct aiocb **ujoblist;
 2780         uint32_t *ujoblist32;
 2781         int error, i;
 2782 
 2783         if (uap->nent < 0 || uap->nent > max_aio_queue_per_proc)
 2784                 return (EINVAL);
 2785 
 2786         if (uap->timeout) {
 2787                 /* Get timespec struct. */
 2788                 if ((error = copyin(uap->timeout, &ts32, sizeof(ts32))) != 0)
 2789                         return (error);
 2790                 CP(ts32, ts, tv_sec);
 2791                 CP(ts32, ts, tv_nsec);
 2792                 tsp = &ts;
 2793         } else
 2794                 tsp = NULL;
 2795 
 2796         ujoblist = malloc(uap->nent * sizeof(ujoblist[0]), M_AIOS, M_WAITOK);
 2797         ujoblist32 = (uint32_t *)ujoblist;
 2798         error = copyin(uap->aiocbp, ujoblist32, uap->nent *
 2799             sizeof(ujoblist32[0]));
 2800         if (error == 0) {
 2801                 for (i = uap->nent - 1; i >= 0; i--)
 2802                         ujoblist[i] = PTRIN(ujoblist32[i]);
 2803 
 2804                 error = kern_aio_suspend(td, uap->nent, ujoblist, tsp);
 2805         }
 2806         free(ujoblist, M_AIOS);
 2807         return (error);
 2808 }
 2809 
 2810 int
 2811 freebsd32_aio_error(struct thread *td, struct freebsd32_aio_error_args *uap)
 2812 {
 2813 
 2814         return (kern_aio_error(td, (struct aiocb *)uap->aiocbp, &aiocb32_ops));
 2815 }
 2816 
 2817 #ifdef COMPAT_FREEBSD6
 2818 int
 2819 freebsd6_freebsd32_aio_read(struct thread *td,
 2820     struct freebsd6_freebsd32_aio_read_args *uap)
 2821 {
 2822 
 2823         return (aio_aqueue(td, (struct aiocb *)uap->aiocbp, NULL, LIO_READ,
 2824             &aiocb32_ops_osigevent));
 2825 }
 2826 #endif
 2827 
 2828 int
 2829 freebsd32_aio_read(struct thread *td, struct freebsd32_aio_read_args *uap)
 2830 {
 2831 
 2832         return (aio_aqueue(td, (struct aiocb *)uap->aiocbp, NULL, LIO_READ,
 2833             &aiocb32_ops));
 2834 }
 2835 
 2836 #ifdef COMPAT_FREEBSD6
 2837 int
 2838 freebsd6_freebsd32_aio_write(struct thread *td,
 2839     struct freebsd6_freebsd32_aio_write_args *uap)
 2840 {
 2841 
 2842         return (aio_aqueue(td, (struct aiocb *)uap->aiocbp, NULL, LIO_WRITE,
 2843             &aiocb32_ops_osigevent));
 2844 }
 2845 #endif
 2846 
 2847 int
 2848 freebsd32_aio_write(struct thread *td, struct freebsd32_aio_write_args *uap)
 2849 {
 2850 
 2851         return (aio_aqueue(td, (struct aiocb *)uap->aiocbp, NULL, LIO_WRITE,
 2852             &aiocb32_ops));
 2853 }
 2854 
 2855 int
 2856 freebsd32_aio_mlock(struct thread *td, struct freebsd32_aio_mlock_args *uap)
 2857 {
 2858 
 2859         return (aio_aqueue(td, (struct aiocb *)uap->aiocbp, NULL, LIO_MLOCK,
 2860             &aiocb32_ops));
 2861 }
 2862 
 2863 int
 2864 freebsd32_aio_waitcomplete(struct thread *td,
 2865     struct freebsd32_aio_waitcomplete_args *uap)
 2866 {
 2867         struct timespec32 ts32;
 2868         struct timespec ts, *tsp;
 2869         int error;
 2870 
 2871         if (uap->timeout) {
 2872                 /* Get timespec struct. */
 2873                 error = copyin(uap->timeout, &ts32, sizeof(ts32));
 2874                 if (error)
 2875                         return (error);
 2876                 CP(ts32, ts, tv_sec);
 2877                 CP(ts32, ts, tv_nsec);
 2878                 tsp = &ts;
 2879         } else
 2880                 tsp = NULL;
 2881 
 2882         return (kern_aio_waitcomplete(td, (struct aiocb **)uap->aiocbp, tsp,
 2883             &aiocb32_ops));
 2884 }
 2885 
 2886 int
 2887 freebsd32_aio_fsync(struct thread *td, struct freebsd32_aio_fsync_args *uap)
 2888 {
 2889 
 2890         return (kern_aio_fsync(td, uap->op, (struct aiocb *)uap->aiocbp,
 2891             &aiocb32_ops));
 2892 }
 2893 
 2894 #ifdef COMPAT_FREEBSD6
 2895 int
 2896 freebsd6_freebsd32_lio_listio(struct thread *td,
 2897     struct freebsd6_freebsd32_lio_listio_args *uap)
 2898 {
 2899         struct aiocb **acb_list;
 2900         struct sigevent *sigp, sig;
 2901         struct osigevent32 osig;
 2902         uint32_t *acb_list32;
 2903         int error, i, nent;
 2904 
 2905         if ((uap->mode != LIO_NOWAIT) && (uap->mode != LIO_WAIT))
 2906                 return (EINVAL);
 2907 
 2908         nent = uap->nent;
 2909         if (nent < 0 || nent > max_aio_queue_per_proc)
 2910                 return (EINVAL);
 2911 
 2912         if (uap->sig && (uap->mode == LIO_NOWAIT)) {
 2913                 error = copyin(uap->sig, &osig, sizeof(osig));
 2914                 if (error)
 2915                         return (error);
 2916                 error = convert_old_sigevent32(&osig, &sig);
 2917                 if (error)
 2918                         return (error);
 2919                 sigp = &sig;
 2920         } else
 2921                 sigp = NULL;
 2922 
 2923         acb_list32 = malloc(sizeof(uint32_t) * nent, M_LIO, M_WAITOK);
 2924         error = copyin(uap->acb_list, acb_list32, nent * sizeof(uint32_t));
 2925         if (error) {
 2926                 free(acb_list32, M_LIO);
 2927                 return (error);
 2928         }
 2929         acb_list = malloc(sizeof(struct aiocb *) * nent, M_LIO, M_WAITOK);
 2930         for (i = 0; i < nent; i++)
 2931                 acb_list[i] = PTRIN(acb_list32[i]);
 2932         free(acb_list32, M_LIO);
 2933 
 2934         error = kern_lio_listio(td, uap->mode,
 2935             (struct aiocb * const *)uap->acb_list, acb_list, nent, sigp,
 2936             &aiocb32_ops_osigevent);
 2937         free(acb_list, M_LIO);
 2938         return (error);
 2939 }
 2940 #endif
 2941 
 2942 int
 2943 freebsd32_lio_listio(struct thread *td, struct freebsd32_lio_listio_args *uap)
 2944 {
 2945         struct aiocb **acb_list;
 2946         struct sigevent *sigp, sig;
 2947         struct sigevent32 sig32;
 2948         uint32_t *acb_list32;
 2949         int error, i, nent;
 2950 
 2951         if ((uap->mode != LIO_NOWAIT) && (uap->mode != LIO_WAIT))
 2952                 return (EINVAL);
 2953 
 2954         nent = uap->nent;
 2955         if (nent < 0 || nent > max_aio_queue_per_proc)
 2956                 return (EINVAL);
 2957 
 2958         if (uap->sig && (uap->mode == LIO_NOWAIT)) {
 2959                 error = copyin(uap->sig, &sig32, sizeof(sig32));
 2960                 if (error)
 2961                         return (error);
 2962                 error = convert_sigevent32(&sig32, &sig);
 2963                 if (error)
 2964                         return (error);
 2965                 sigp = &sig;
 2966         } else
 2967                 sigp = NULL;
 2968 
 2969         acb_list32 = malloc(sizeof(uint32_t) * nent, M_LIO, M_WAITOK);
 2970         error = copyin(uap->acb_list, acb_list32, nent * sizeof(uint32_t));
 2971         if (error) {
 2972                 free(acb_list32, M_LIO);
 2973                 return (error);
 2974         }
 2975         acb_list = malloc(sizeof(struct aiocb *) * nent, M_LIO, M_WAITOK);
 2976         for (i = 0; i < nent; i++)
 2977                 acb_list[i] = PTRIN(acb_list32[i]);
 2978         free(acb_list32, M_LIO);
 2979 
 2980         error = kern_lio_listio(td, uap->mode,
 2981             (struct aiocb * const *)uap->acb_list, acb_list, nent, sigp,
 2982             &aiocb32_ops);
 2983         free(acb_list, M_LIO);
 2984         return (error);
 2985 }
 2986 
 2987 #endif
Cache object: 69c43a4c856720a6848ddeba9d67256a
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.
FreeBSD/Linux Kernel Cross Reference sys/kern/vfs_aio.c

FreeBSD/Linux Kernel Cross Reference
sys/kern/vfs_aio.c
