211 lines
6.3 KiB
C
211 lines
6.3 KiB
C
/* $NetBSD: tmpfs_pool.c,v 1.2 2005/09/12 19:56:58 yamt Exp $ */
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/*
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* Copyright (c) 2005 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Julio M. Merino Vidal.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Pool allocator and convenience routines for tmpfs.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: tmpfs_pool.c,v 1.2 2005/09/12 19:56:58 yamt Exp $");
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#include <sys/param.h>
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#include <sys/pool.h>
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#include <uvm/uvm.h>
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#include <fs/tmpfs/tmpfs.h>
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/* --------------------------------------------------------------------- */
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void * tmpfs_pool_page_alloc(struct pool *, int);
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void tmpfs_pool_page_free(struct pool *, void *);
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/* XXX: Will go away when our pool allocator does what it has to do by
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* itself. */
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extern void* pool_page_alloc_nointr(struct pool *, int);
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extern void pool_page_free_nointr(struct pool *, void *);
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/* --------------------------------------------------------------------- */
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struct pool_allocator tmpfs_pool_allocator = {
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tmpfs_pool_page_alloc,
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tmpfs_pool_page_free,
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0,
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};
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/* --------------------------------------------------------------------- */
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void
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tmpfs_pool_init(struct tmpfs_pool *tpp, size_t size, const char *what,
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struct tmpfs_mount *tmp)
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{
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int cnt;
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cnt = snprintf(tpp->tp_name, sizeof(tpp->tp_name),
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"%s_pool_%p", what, tmp);
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KASSERT(cnt < sizeof(tpp->tp_name));
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pool_init(&tpp->tp_pool, size, 0, 0, 0, tpp->tp_name,
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&tmpfs_pool_allocator);
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tpp->tp_mount = tmp;
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}
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/* --------------------------------------------------------------------- */
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void
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tmpfs_pool_destroy(struct tmpfs_pool *tpp)
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{
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pool_destroy((struct pool *)tpp);
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}
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/* --------------------------------------------------------------------- */
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void *
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tmpfs_pool_page_alloc(struct pool *pp, int flags)
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{
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void *page;
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struct tmpfs_pool *tpp;
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struct tmpfs_mount *tmp;
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tpp = (struct tmpfs_pool *)pp;
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tmp = tpp->tp_mount;
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if (TMPFS_PAGES_MAX(tmp) - tmp->tm_pages_used == 0)
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return NULL;
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tmp->tm_pages_used += 1;
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page = pool_page_alloc_nointr(pp, flags);
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KASSERT(page != NULL);
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return page;
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}
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/* --------------------------------------------------------------------- */
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void
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tmpfs_pool_page_free(struct pool *pp, void *v)
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{
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struct tmpfs_pool *tpp;
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struct tmpfs_mount *tmp;
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tpp = (struct tmpfs_pool *)pp;
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tmp = tpp->tp_mount;
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tmp->tm_pages_used -= 1;
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pool_page_free_nointr(pp, v);
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}
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/* --------------------------------------------------------------------- */
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void
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tmpfs_str_pool_init(struct tmpfs_str_pool *tsp, struct tmpfs_mount *tmp)
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{
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tmpfs_pool_init(&tsp->tsp_pool_16, 16, "str", tmp);
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tmpfs_pool_init(&tsp->tsp_pool_32, 32, "str", tmp);
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tmpfs_pool_init(&tsp->tsp_pool_64, 64, "str", tmp);
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tmpfs_pool_init(&tsp->tsp_pool_128, 128, "str", tmp);
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tmpfs_pool_init(&tsp->tsp_pool_256, 256, "str", tmp);
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tmpfs_pool_init(&tsp->tsp_pool_512, 512, "str", tmp);
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tmpfs_pool_init(&tsp->tsp_pool_1024, 1024, "str", tmp);
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}
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/* --------------------------------------------------------------------- */
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void
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tmpfs_str_pool_destroy(struct tmpfs_str_pool *tsp)
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{
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tmpfs_pool_destroy(&tsp->tsp_pool_16);
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tmpfs_pool_destroy(&tsp->tsp_pool_32);
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tmpfs_pool_destroy(&tsp->tsp_pool_64);
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tmpfs_pool_destroy(&tsp->tsp_pool_128);
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tmpfs_pool_destroy(&tsp->tsp_pool_256);
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tmpfs_pool_destroy(&tsp->tsp_pool_512);
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tmpfs_pool_destroy(&tsp->tsp_pool_1024);
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}
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/* --------------------------------------------------------------------- */
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char *
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tmpfs_str_pool_get(struct tmpfs_str_pool *tsp, size_t len, int flags)
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{
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struct tmpfs_pool *p;
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KASSERT(len <= 1024);
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if (len <= 16) p = &tsp->tsp_pool_16;
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else if (len <= 32) p = &tsp->tsp_pool_32;
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else if (len <= 64) p = &tsp->tsp_pool_64;
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else if (len <= 128) p = &tsp->tsp_pool_128;
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else if (len <= 256) p = &tsp->tsp_pool_256;
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else if (len <= 512) p = &tsp->tsp_pool_512;
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else if (len <= 1024) p = &tsp->tsp_pool_1024;
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else {
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KASSERT(0);
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p = NULL; /* Silence compiler warnings */
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}
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return (char *)TMPFS_POOL_GET(p, flags);
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}
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/* --------------------------------------------------------------------- */
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void
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tmpfs_str_pool_put(struct tmpfs_str_pool *tsp, char *str, size_t len)
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{
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struct tmpfs_pool *p;
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KASSERT(len <= 1024);
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if (len <= 16) p = &tsp->tsp_pool_16;
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else if (len <= 32) p = &tsp->tsp_pool_32;
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else if (len <= 64) p = &tsp->tsp_pool_64;
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else if (len <= 128) p = &tsp->tsp_pool_128;
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else if (len <= 256) p = &tsp->tsp_pool_256;
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else if (len <= 512) p = &tsp->tsp_pool_512;
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else if (len <= 1024) p = &tsp->tsp_pool_1024;
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else {
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KASSERT(0);
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p = NULL; /* Silence compiler warnings */
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}
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TMPFS_POOL_PUT(p, str);
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}
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