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https://github.com/freebsd/freebsd-src.git
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9733a80839
It's not finished yet (I still have to find a way to implement process- dependent nodes without consuming too much memory, and the permission system needs tightening up), but it's becoming hard to work on without a repo (I've accidentally almost nuked it once already), and it works (except for the lack of process-dependent nodes, that is). I was supposed to commit this a week ago, but timed out waiting for jkh to reply to some questions I had. Pass him a spoonful of bad karma :)
169 lines
4.4 KiB
C
169 lines
4.4 KiB
C
/*-
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* Copyright (c) 2001 Dag-Erling Coïdan Smørgrav
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* All rights reserved.
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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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* in this position and unchanged.
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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. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <sys/malloc.h>
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#include <sys/mount.h>
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#include <sys/sbuf.h>
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#include <sys/sysctl.h>
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#include <sys/vnode.h>
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#include <fs/pseudofs/pseudofs.h>
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#include <fs/pseudofs/pseudofs_internal.h>
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static MALLOC_DEFINE(M_PFSVNCACHE, "pseudofs_vncache", "pseudofs vnode cache");
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static struct mtx pfs_vncache_mutex;
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struct pfs_vnode {
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struct vnode *pv_vnode;
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struct pfs_vnode *pv_next;
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} *pfs_vncache;
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SYSCTL_NODE(_vfs_pfs, OID_AUTO, vncache, CTLFLAG_RW, 0,
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"pseudofs vnode cache");
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static int pfs_vncache_hits;
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SYSCTL_INT(_vfs_pfs_vncache, OID_AUTO, hits, CTLFLAG_RD, &pfs_vncache_hits, 0,
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"number of cache hits since initialization");
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static int pfs_vncache_misses;
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SYSCTL_INT(_vfs_pfs_vncache, OID_AUTO, misses, CTLFLAG_RD, &pfs_vncache_misses, 0,
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"number of cache misses since initialization");
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extern vop_t **pfs_vnodeop_p;
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/*
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* Initialize vnode cache
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*/
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void
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pfs_vncache_load(void)
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{
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mtx_init(&pfs_vncache_mutex, "pseudofs_vncache", MTX_DEF);
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}
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/*
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* Tear down vnode cache
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*/
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void
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pfs_vncache_unload(void)
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{
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mtx_destroy(&pfs_vncache_mutex);
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}
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/*
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* Allocate a vnode
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*/
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int
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pfs_vncache_alloc(struct mount *mp, struct vnode **vpp, struct pfs_node *pn)
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{
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struct pfs_vnode *pv;
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int error;
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mtx_lock(&pfs_vncache_mutex);
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/* see if the vnode is in the cache */
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for (pv = pfs_vncache; pv; pv = pv->pv_next)
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if (pv->pv_vnode->v_data == pn)
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if (vget(pv->pv_vnode, 0, curproc) == 0) {
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++pfs_vncache_hits;
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*vpp = pv->pv_vnode;
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mtx_unlock(&pfs_vncache_mutex);
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return (0);
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}
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++pfs_vncache_misses;
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/* nope, get a new one */
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MALLOC(pv, struct pfs_vnode *, sizeof *pv, M_PFSVNCACHE, M_WAITOK);
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error = getnewvnode(VT_PSEUDOFS, mp, pfs_vnodeop_p, vpp);
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if (error) {
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mtx_unlock(&pfs_vncache_mutex);
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return (error);
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}
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(*vpp)->v_data = pn;
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switch (pn->pn_type) {
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case pfstype_root:
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(*vpp)->v_flag = VROOT;
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#if 0
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printf("root vnode allocated\n");
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#endif
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case pfstype_dir:
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case pfstype_this:
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case pfstype_parent:
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(*vpp)->v_type = VDIR;
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break;
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case pfstype_file:
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(*vpp)->v_type = VREG;
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break;
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case pfstype_symlink:
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(*vpp)->v_type = VLNK;
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break;
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default:
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panic("%s has unexpected type: %d", pn->pn_name, pn->pn_type);
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}
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pv->pv_vnode = *vpp;
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pv->pv_next = pfs_vncache;
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pfs_vncache = pv;
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mtx_unlock(&pfs_vncache_mutex);
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return (0);
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}
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/*
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* Free a vnode
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*/
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int
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pfs_vncache_free(struct vnode *vp)
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{
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struct pfs_vnode *prev, *pv;
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mtx_lock(&pfs_vncache_mutex);
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for (prev = NULL, pv = pfs_vncache; pv; prev = pv, pv = pv->pv_next)
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if (pv->pv_vnode == vp)
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break;
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if (!pv)
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printf("pfs_vncache_free(): not in cache\n"); /* it should be! */
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#if 0
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if (vp->v_data == ((struct pfs_info *)vp->v_mount->mnt_data)->pi_root)
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printf("root vnode reclaimed\n");
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#endif
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vp->v_data = NULL;
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if (pv) {
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if (prev)
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prev->pv_next = pv->pv_next;
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else
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pfs_vncache = pv->pv_next;
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FREE(pv, M_PFSVNCACHE);
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}
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mtx_unlock(&pfs_vncache_mutex);
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return (0);
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}
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