d9b2d9f7a2
these filesystems will support shared locks until they are explicitly modified to do so. Careful review must be done to ensure that this is safe for each individual filesystem. Sponsored by: Isilon Systems, Inc.
204 lines
5.1 KiB
C
204 lines
5.1 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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*
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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. 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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* 4. 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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* @(#)fdesc_vfsops.c 8.4 (Berkeley) 1/21/94
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*
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* $FreeBSD$
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*/
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/*
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* /dev/fd Filesystem
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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/filedesc.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/mutex.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/resourcevar.h>
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#include <sys/vnode.h>
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#include <fs/fdescfs/fdesc.h>
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static MALLOC_DEFINE(M_FDESCMNT, "FDESC mount", "FDESC mount structure");
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static vfs_mount_t fdesc_mount;
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static vfs_unmount_t fdesc_unmount;
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static vfs_statfs_t fdesc_statfs;
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static vfs_root_t fdesc_root;
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/*
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* Mount the per-process file descriptors (/dev/fd)
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*/
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static int
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fdesc_mount(struct mount *mp, struct thread *td)
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{
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int error = 0;
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struct fdescmount *fmp;
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struct vnode *rvp;
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/*
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* Update is a no-op
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*/
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if (mp->mnt_flag & (MNT_UPDATE | MNT_ROOTFS))
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return (EOPNOTSUPP);
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error = fdesc_allocvp(Froot, FD_ROOT, mp, &rvp, td);
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if (error)
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return (error);
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MALLOC(fmp, struct fdescmount *, sizeof(struct fdescmount),
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M_FDESCMNT, M_WAITOK); /* XXX */
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rvp->v_type = VDIR;
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rvp->v_vflag |= VV_ROOT;
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fmp->f_root = rvp;
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/* XXX -- don't mark as local to work around fts() problems */
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/*mp->mnt_flag |= MNT_LOCAL;*/
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mp->mnt_data = (qaddr_t) fmp;
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vfs_getnewfsid(mp);
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vfs_mountedfrom(mp, "fdescfs");
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return (0);
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}
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static int
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fdesc_unmount(mp, mntflags, td)
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struct mount *mp;
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int mntflags;
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struct thread *td;
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{
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int error;
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int flags = 0;
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if (mntflags & MNT_FORCE)
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flags |= FORCECLOSE;
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/*
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* Clear out buffer cache. I don't think we
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* ever get anything cached at this level at the
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* moment, but who knows...
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*
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* There is 1 extra root vnode reference corresponding
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* to f_root.
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*/
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if ((error = vflush(mp, 1, flags, td)) != 0)
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return (error);
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/*
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* Finally, throw away the fdescmount structure
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*/
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free(mp->mnt_data, M_FDESCMNT); /* XXX */
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mp->mnt_data = 0;
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return (0);
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}
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static int
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fdesc_root(mp, flags, vpp, td)
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struct mount *mp;
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int flags;
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struct vnode **vpp;
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struct thread *td;
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{
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struct vnode *vp;
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/*
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* Return locked reference to root.
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*/
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vp = VFSTOFDESC(mp)->f_root;
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VREF(vp);
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vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
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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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fdesc_statfs(mp, sbp, td)
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struct mount *mp;
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struct statfs *sbp;
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struct thread *td;
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{
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struct filedesc *fdp;
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int lim;
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int i;
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int last;
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int freefd;
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/*
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* Compute number of free file descriptors.
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* [ Strange results will ensue if the open file
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* limit is ever reduced below the current number
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* of open files... ]
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*/
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PROC_LOCK(td->td_proc);
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lim = lim_cur(td->td_proc, RLIMIT_NOFILE);
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PROC_UNLOCK(td->td_proc);
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fdp = td->td_proc->p_fd;
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FILEDESC_LOCK_FAST(fdp);
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last = min(fdp->fd_nfiles, lim);
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freefd = 0;
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for (i = fdp->fd_freefile; i < last; i++)
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if (fdp->fd_ofiles[i] == NULL)
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freefd++;
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/*
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* Adjust for the fact that the fdesc array may not
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* have been fully allocated yet.
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*/
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if (fdp->fd_nfiles < lim)
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freefd += (lim - fdp->fd_nfiles);
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FILEDESC_UNLOCK_FAST(fdp);
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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 = lim + 1; /* Allow for "." */
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sbp->f_ffree = freefd; /* See comments above */
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return (0);
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}
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static struct vfsops fdesc_vfsops = {
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.vfs_init = fdesc_init,
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.vfs_mount = fdesc_mount,
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.vfs_root = fdesc_root,
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.vfs_statfs = fdesc_statfs,
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.vfs_unmount = fdesc_unmount,
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};
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VFS_SET(fdesc_vfsops, fdescfs, VFCF_SYNTHETIC);
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