151 lines
4.8 KiB
C
151 lines
4.8 KiB
C
/*
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* Copyright (c) 2000 Peter Edwards
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* Copyright (c) 1988, 1993
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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 contributed to Berkeley by Peter Edwards
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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 University of
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* California, Berkeley and its contributors.
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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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/time.h>
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#include <sys/stat.h>
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#include <sys/vnode.h>
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#define _KERNEL
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#include <sys/mount.h>
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#include <fs/msdosfs/bpb.h>
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#include <fs/msdosfs/msdosfsmount.h>
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#undef _KERNEL
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#include <fs/msdosfs/denode.h>
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#include <fs/msdosfs/direntry.h>
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#include <fs/msdosfs/fat.h>
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#include <err.h>
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#include <kvm.h>
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#include <stdio.h>
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#include <stdlib.h>
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/*
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* XXX -
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* VTODE is defined in denode.h only if _KERNEL is defined, but that leads to
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* header explosion
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*/
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#define VTODE(vp) ((struct denode *)(vp)->v_data)
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#include "fstat.h"
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struct dosmount {
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struct dosmount *next;
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struct msdosfsmount *kptr; /* Pointer in kernel space */
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struct msdosfsmount data; /* User space copy of structure */
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};
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int
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msdosfs_filestat(struct vnode *vp, struct filestat *fsp)
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{
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struct denode denode;
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static struct dosmount *mounts;
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struct dosmount *mnt;
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u_long dirsperblk;
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int fileid;
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if (!KVM_READ(VTODE(vp), &denode, sizeof (denode))) {
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dprintf(stderr, "can't read denode at %p for pid %d\n",
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(void *)VTODE(vp), Pid);
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return 0;
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}
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/*
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* Find msdosfsmount structure for the vnode's filesystem. Needed
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* for some filesystem parameters
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*/
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for (mnt = mounts; mnt; mnt = mnt->next)
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if (mnt->kptr == denode.de_pmp)
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break;
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if (!mnt) {
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if ((mnt = malloc(sizeof(struct dosmount))) == NULL)
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err(1, NULL);
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if (!KVM_READ(denode.de_pmp, &mnt->data, sizeof mnt->data)) {
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free(mnt);
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dprintf(stderr,
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"can't read mount info at %p for pid %d\n",
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(void *)denode.de_pmp, Pid);
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return 0;
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}
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mnt->next = mounts;
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mounts = mnt;
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mnt->kptr = denode.de_pmp;
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}
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fsp->fsid = dev2udev(mnt->data.pm_dev);
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fsp->mode = 0555;
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fsp->mode |= denode.de_Attributes & ATTR_READONLY ? 0 : 0222;
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fsp->mode &= mnt->data.pm_mask;
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/* Distinguish directories and files. No "special" files in FAT. */
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fsp->mode |= denode.de_Attributes & ATTR_DIRECTORY ? S_IFDIR : S_IFREG;
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fsp->size = denode.de_FileSize;
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fsp->rdev = 0;
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/*
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* XXX -
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* Culled from msdosfs_vnops.c. There appears to be a problem
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* here, in that a directory has the same inode number as the first
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* file in the directory. stat(2) suffers from this problem also, so
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* I won't try to fix it here.
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*
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* The following computation of the fileid must be the same as that
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* used in msdosfs_readdir() to compute d_fileno. If not, pwd
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* doesn't work.
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*/
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dirsperblk = mnt->data.pm_BytesPerSec / sizeof(struct direntry);
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if (denode.de_Attributes & ATTR_DIRECTORY) {
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fileid = cntobn(&mnt->data, denode.de_StartCluster)
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* dirsperblk;
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if (denode.de_StartCluster == MSDOSFSROOT)
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fileid = 1;
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} else {
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fileid = cntobn(&mnt->data, denode.de_dirclust) * dirsperblk;
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if (denode.de_dirclust == MSDOSFSROOT)
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fileid = roottobn(&mnt->data, 0) * dirsperblk;
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fileid += denode.de_diroffset / sizeof(struct direntry);
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}
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fsp->fileid = fileid;
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return 1;
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}
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