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Under certain circumstances the following functions may be called in a context where KM_SLEEP is unsafe and can result in a deadlocked system. To avoid this problem the unconditional KM_SLEEPs are converted to KM_PUSHPAGEs. This will prevent them from attempting to initiate any I/O during direct reclaim. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
140 lines
3.9 KiB
C
140 lines
3.9 KiB
C
/*****************************************************************************\
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* Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
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* Copyright (C) 2007 The Regents of the University of California.
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* Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
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* Written by Brian Behlendorf <behlendorf1@llnl.gov>.
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* UCRL-CODE-235197
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*
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* This file is part of the SPL, Solaris Porting Layer.
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* For details, see <http://github.com/behlendorf/spl/>.
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*
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* The SPL is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* The SPL is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with the SPL. If not, see <http://www.gnu.org/licenses/>.
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*****************************************************************************
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* Solaris Porting Layer (SPL) Thread Implementation.
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\*****************************************************************************/
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#include <sys/thread.h>
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#include <sys/kmem.h>
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#include <sys/tsd.h>
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#include <spl-debug.h>
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#ifdef SS_DEBUG_SUBSYS
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#undef SS_DEBUG_SUBSYS
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#endif
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#define SS_DEBUG_SUBSYS SS_THREAD
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/*
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* Thread interfaces
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*/
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typedef struct thread_priv_s {
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unsigned long tp_magic; /* Magic */
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int tp_name_size; /* Name size */
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char *tp_name; /* Name (without _thread suffix) */
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void (*tp_func)(void *); /* Registered function */
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void *tp_args; /* Args to be passed to function */
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size_t tp_len; /* Len to be passed to function */
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int tp_state; /* State to start thread at */
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pri_t tp_pri; /* Priority to start threat at */
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} thread_priv_t;
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static int
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thread_generic_wrapper(void *arg)
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{
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thread_priv_t *tp = (thread_priv_t *)arg;
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void (*func)(void *);
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void *args;
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ASSERT(tp->tp_magic == TP_MAGIC);
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func = tp->tp_func;
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args = tp->tp_args;
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set_current_state(tp->tp_state);
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set_user_nice((kthread_t *)current, PRIO_TO_NICE(tp->tp_pri));
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kmem_free(tp->tp_name, tp->tp_name_size);
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kmem_free(tp, sizeof(thread_priv_t));
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if (func)
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func(args);
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return 0;
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}
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void
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__thread_exit(void)
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{
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SENTRY;
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SEXIT;
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tsd_exit();
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complete_and_exit(NULL, 0);
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/* Unreachable */
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}
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EXPORT_SYMBOL(__thread_exit);
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/* thread_create() may block forever if it cannot create a thread or
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* allocate memory. This is preferable to returning a NULL which Solaris
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* style callers likely never check for... since it can't fail. */
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kthread_t *
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__thread_create(caddr_t stk, size_t stksize, thread_func_t func,
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const char *name, void *args, size_t len, proc_t *pp,
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int state, pri_t pri)
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{
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thread_priv_t *tp;
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struct task_struct *tsk;
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char *p;
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SENTRY;
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/* Option pp is simply ignored */
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/* Variable stack size unsupported */
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ASSERT(stk == NULL);
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tp = kmem_alloc(sizeof(thread_priv_t), KM_PUSHPAGE);
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if (tp == NULL)
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SRETURN(NULL);
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tp->tp_magic = TP_MAGIC;
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tp->tp_name_size = strlen(name) + 1;
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tp->tp_name = kmem_alloc(tp->tp_name_size, KM_PUSHPAGE);
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if (tp->tp_name == NULL) {
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kmem_free(tp, sizeof(thread_priv_t));
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SRETURN(NULL);
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}
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strncpy(tp->tp_name, name, tp->tp_name_size);
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/* Strip trailing "_thread" from passed name which will be the func
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* name since the exposed API has no parameter for passing a name.
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*/
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p = strstr(tp->tp_name, "_thread");
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if (p)
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p[0] = '\0';
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tp->tp_func = func;
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tp->tp_args = args;
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tp->tp_len = len;
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tp->tp_state = state;
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tp->tp_pri = pri;
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tsk = kthread_create(thread_generic_wrapper, (void *)tp,
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"%s", tp->tp_name);
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if (IS_ERR(tsk)) {
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SERROR("Failed to create thread: %ld\n", PTR_ERR(tsk));
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SRETURN(NULL);
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}
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wake_up_process(tsk);
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SRETURN((kthread_t *)tsk);
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}
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EXPORT_SYMBOL(__thread_create);
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