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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 :)
173 lines
4.0 KiB
C
173 lines
4.0 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/module.h>
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#include <sys/mount.h>
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#include <sys/proc.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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SYSCTL_NODE(_vfs, OID_AUTO, pfs, CTLFLAG_RW, 0,
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"pseudofs");
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/*
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* Mount a pseudofs instance
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*/
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int
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pfs_mount(struct pfs_info *pi, struct mount *mp, char *path, caddr_t data,
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struct nameidata *ndp, struct proc *p)
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{
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struct statfs *sbp;
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if (mp->mnt_flag & MNT_UPDATE)
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return (EOPNOTSUPP);
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mp->mnt_flag |= MNT_LOCAL;
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mp->mnt_data = (qaddr_t)pi;
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vfs_getnewfsid(mp);
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sbp = &mp->mnt_stat;
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bcopy(pi->pi_name, sbp->f_mntfromname, sizeof pi->pi_name);
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sbp->f_bsize = PAGE_SIZE;
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sbp->f_iosize = PAGE_SIZE;
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sbp->f_blocks = 1;
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sbp->f_bfree = 0;
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sbp->f_bavail = 0;
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sbp->f_files = 1;
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sbp->f_ffree = 0;
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return (0);
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}
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/*
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* Unmount a pseudofs instance
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*/
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int
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pfs_unmount(struct mount *mp, int mntflags, struct proc *p)
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{
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struct pfs_info *pi;
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int error;
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pi = (struct pfs_info *)mp->mnt_data;
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/* XXX do stuff with pi... */
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error = vflush(mp, 0, (mntflags & MNT_FORCE) ? FORCECLOSE : 0);
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return (error);
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}
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/*
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* Return a root vnode
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*/
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int
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pfs_root(struct mount *mp, struct vnode **vpp)
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{
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struct pfs_info *pi;
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pi = (struct pfs_info *)mp->mnt_data;
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return pfs_vncache_alloc(mp, vpp, pi->pi_root);
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}
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/*
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* Return filesystem stats
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*/
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int
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pfs_statfs(struct mount *mp, struct statfs *sbp, struct proc *p)
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{
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bcopy(&mp->mnt_stat, sbp, sizeof *sbp);
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return (0);
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}
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/*
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* Initialize a pseudofs instance
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*/
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int
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pfs_init(struct pfs_info *pi, struct vfsconf *vfc)
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{
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mtx_init(&pi->pi_mutex, "pseudofs", MTX_DEF);
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pfs_fileno_init(pi);
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printf("%s registered\n", pi->pi_name);
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return (0);
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}
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/*
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* Destroy a pseudofs instance
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*/
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int
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pfs_uninit(struct pfs_info *pi, struct vfsconf *vfc)
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{
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pfs_fileno_uninit(pi);
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mtx_destroy(&pi->pi_mutex);
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printf("%s unregistered\n", pi->pi_name);
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return (0);
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}
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/*
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* Handle load / unload events
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*/
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static int
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pfs_modevent(module_t mod, int evt, void *arg)
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{
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switch (evt) {
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case MOD_LOAD:
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pfs_fileno_load();
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pfs_vncache_load();
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break;
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case MOD_UNLOAD:
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case MOD_SHUTDOWN:
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pfs_vncache_unload();
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pfs_fileno_unload();
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break;
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default:
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printf("pseudofs: unexpected event type %d\n", evt);
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break;
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}
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return 0;
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}
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/*
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* Module declaration
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*/
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static moduledata_t pseudofs_data = {
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"pseudofs",
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pfs_modevent,
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NULL
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};
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DECLARE_MODULE(pseudofs, pseudofs_data, SI_SUB_EXEC, SI_ORDER_FIRST);
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MODULE_VERSION(pseudofs, 1);
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