dfd233edd5
the VFS. Now all the VFS_* functions and relating parts don't want the context as long as it always refers to curthread. In some points, in particular when dealing with VOPs and functions living in the same namespace (eg. vflush) which still need to be converted, pass curthread explicitly in order to retain the old behaviour. Such loose ends will be fixed ASAP. While here fix a bug: now, UFS_EXTATTR can be compiled alone without the UFS_EXTATTR_AUTOSTART option. VFS KPI is heavilly changed by this commit so thirdy parts modules needs to be recompiled. Bump __FreeBSD_version in order to signal such situation.
189 lines
4.6 KiB
C
189 lines
4.6 KiB
C
/*-
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* Copyright (c) 1992, 1993, 1995
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* The Regents of the University of California. All rights reserved.
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* Copyright (c) 2000
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* Poul-Henning Kamp. All rights reserved.
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*
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* This code is derived from software donated to Berkeley by
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* Jan-Simon Pendry.
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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. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)kernfs_vfsops.c 8.10 (Berkeley) 5/14/95
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* From: FreeBSD: src/sys/miscfs/kernfs/kernfs_vfsops.c 1.36
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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/systm.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mount.h>
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#include <sys/proc.h>
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#include <sys/sx.h>
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#include <sys/vnode.h>
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#include <sys/limits.h>
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#include <fs/devfs/devfs.h>
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static struct unrhdr *devfs_unr;
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MALLOC_DEFINE(M_DEVFS, "DEVFS", "DEVFS data");
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static vfs_mount_t devfs_mount;
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static vfs_unmount_t devfs_unmount;
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static vfs_root_t devfs_root;
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static vfs_statfs_t devfs_statfs;
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/*
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* Mount the filesystem
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*/
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static int
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devfs_mount(struct mount *mp)
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{
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int error;
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struct devfs_mount *fmp;
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struct vnode *rvp;
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if (devfs_unr == NULL)
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devfs_unr = new_unrhdr(0, INT_MAX, NULL);
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error = 0;
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if (mp->mnt_flag & (MNT_UPDATE | MNT_ROOTFS))
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return (EOPNOTSUPP);
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fmp = malloc(sizeof *fmp, M_DEVFS, M_WAITOK | M_ZERO);
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fmp->dm_idx = alloc_unr(devfs_unr);
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sx_init(&fmp->dm_lock, "devfsmount");
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fmp->dm_holdcnt = 1;
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MNT_ILOCK(mp);
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mp->mnt_flag |= MNT_LOCAL;
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mp->mnt_kern_flag |= MNTK_MPSAFE;
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#ifdef MAC
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mp->mnt_flag |= MNT_MULTILABEL;
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#endif
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MNT_IUNLOCK(mp);
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fmp->dm_mount = mp;
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mp->mnt_data = (void *) fmp;
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vfs_getnewfsid(mp);
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fmp->dm_rootdir = devfs_vmkdir(fmp, NULL, 0, NULL, DEVFS_ROOTINO);
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error = devfs_root(mp, LK_EXCLUSIVE, &rvp);
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if (error) {
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sx_destroy(&fmp->dm_lock);
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free_unr(devfs_unr, fmp->dm_idx);
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free(fmp, M_DEVFS);
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return (error);
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}
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VOP_UNLOCK(rvp, 0);
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vfs_mountedfrom(mp, "devfs");
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return (0);
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}
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void
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devfs_unmount_final(struct devfs_mount *fmp)
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{
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sx_destroy(&fmp->dm_lock);
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free(fmp, M_DEVFS);
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}
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static int
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devfs_unmount(struct mount *mp, int mntflags)
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{
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int error;
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int flags = 0;
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struct devfs_mount *fmp;
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int hold;
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u_int idx;
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fmp = VFSTODEVFS(mp);
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KASSERT(fmp->dm_mount != NULL,
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("devfs_unmount unmounted devfs_mount"));
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/* There is 1 extra root vnode reference from devfs_mount(). */
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error = vflush(mp, 1, flags, curthread);
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if (error)
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return (error);
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sx_xlock(&fmp->dm_lock);
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devfs_cleanup(fmp);
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devfs_rules_cleanup(fmp);
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fmp->dm_mount = NULL;
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hold = --fmp->dm_holdcnt;
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mp->mnt_data = NULL;
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idx = fmp->dm_idx;
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sx_xunlock(&fmp->dm_lock);
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free_unr(devfs_unr, idx);
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if (hold == 0)
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devfs_unmount_final(fmp);
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return 0;
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}
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/* Return locked reference to root. */
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static int
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devfs_root(struct mount *mp, int flags, struct vnode **vpp)
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{
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int error;
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struct vnode *vp;
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struct devfs_mount *dmp;
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dmp = VFSTODEVFS(mp);
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sx_xlock(&dmp->dm_lock);
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error = devfs_allocv(dmp->dm_rootdir, mp, &vp);
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if (error)
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return (error);
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vp->v_vflag |= VV_ROOT;
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*vpp = vp;
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return (0);
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}
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static int
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devfs_statfs(struct mount *mp, struct statfs *sbp)
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{
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sbp->f_flags = 0;
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sbp->f_bsize = DEV_BSIZE;
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sbp->f_iosize = DEV_BSIZE;
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sbp->f_blocks = 2; /* 1K to keep df happy */
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sbp->f_bfree = 0;
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sbp->f_bavail = 0;
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sbp->f_files = 0;
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sbp->f_ffree = 0;
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return (0);
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}
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static struct vfsops devfs_vfsops = {
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.vfs_mount = devfs_mount,
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.vfs_root = devfs_root,
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.vfs_statfs = devfs_statfs,
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.vfs_unmount = devfs_unmount,
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};
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VFS_SET(devfs_vfsops, devfs, VFCF_SYNTHETIC);
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