diff options
Diffstat (limited to 'usr.bin/fstat/msdosfs.c')
| -rw-r--r-- | usr.bin/fstat/msdosfs.c | 150 |
1 files changed, 150 insertions, 0 deletions
diff --git a/usr.bin/fstat/msdosfs.c b/usr.bin/fstat/msdosfs.c new file mode 100644 index 0000000..809477d --- /dev/null +++ b/usr.bin/fstat/msdosfs.c @@ -0,0 +1,150 @@ +/* + * Copyright (c) 2000 Peter Edwards + * Copyright (c) 1988, 1993 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by Peter Edwards + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * $FreeBSD$ + */ + +#include <sys/param.h> +#include <sys/time.h> +#include <sys/stat.h> +#include <sys/vnode.h> + +#define _KERNEL +#include <sys/mount.h> +#include <msdosfs/bpb.h> +#include <msdosfs/msdosfsmount.h> +#undef _KERNEL + +#include <msdosfs/denode.h> +#include <msdosfs/direntry.h> +#include <msdosfs/fat.h> + +#include <err.h> +#include <kvm.h> +#include <stdio.h> +#include <stdlib.h> + +/* + * XXX - + * VTODE is defined in denode.h only if _KERNEL is defined, but that leads to + * header explosion + */ +#define VTODE(vp) ((struct denode *)(vp)->v_data) + +#include "fstat.h" + +struct dosmount { + struct dosmount *next; + struct msdosfsmount *kptr; /* Pointer in kernel space */ + struct msdosfsmount data; /* User space copy of structure */ +}; + +int +msdosfs_filestat(vp, fsp) + struct vnode *vp; + struct filestat *fsp; +{ + struct denode denode; + static struct dosmount *mounts; + struct dosmount *mnt; + u_long dirsperblk; + int fileid; + + if (!KVM_READ(VTODE(vp), &denode, sizeof (denode))) { + dprintf(stderr, "can't read denode at %p for pid %d\n", + (void *)VTODE(vp), Pid); + return 0; + } + + /* + * Find msdosfsmount structure for the vnode's filesystem. Needed + * for some filesystem parameters + */ + for (mnt = mounts; mnt; mnt = mnt->next) + if (mnt->kptr == denode.de_pmp) + break; + + if (!mnt) { + if ((mnt = malloc(sizeof(struct dosmount))) == NULL) + err(1, NULL); + mnt->next = mounts; + mounts = mnt; + mnt->kptr = denode.de_pmp; + if (!KVM_READ(denode.de_pmp, &mnt->data, sizeof mnt->data)) { + dprintf(stderr, + "can't read mount info at %p for pid %d\n", + (void *)denode.de_pmp, Pid); + return 0; + } + } + + fsp->fsid = dev2udev(denode.de_dev) & 0xffff; + fsp->mode = 0555; + fsp->mode |= denode.de_Attributes & ATTR_READONLY ? 0 : 0222; + fsp->mode &= mnt->data.pm_mask; + + /* Distinguish directories and files. No "special" files in FAT. */ + fsp->mode |= denode.de_Attributes & ATTR_DIRECTORY ? S_IFDIR : S_IFREG; + + fsp->size = denode.de_FileSize; + fsp->rdev = denode.de_dev; + + /* + * XXX - + * Culled from msdosfs_vnops.c. There appears to be a problem + * here, in that a directory has the same inode number as the first + * file in the directory. stat(2) suffers from this problem also, so + * I won't try to fix it here. + * + * The following computation of the fileid must be the same as that + * used in msdosfs_readdir() to compute d_fileno. If not, pwd + * doesn't work. + */ + dirsperblk = mnt->data.pm_BytesPerSec / sizeof(struct direntry); + if (denode.de_Attributes & ATTR_DIRECTORY) { + fileid = cntobn(&mnt->data, denode.de_StartCluster) + * dirsperblk; + if (denode.de_StartCluster == MSDOSFSROOT) + fileid = 1; + } else { + fileid = cntobn(&mnt->data, denode.de_dirclust) * dirsperblk; + if (denode.de_dirclust == MSDOSFSROOT) + fileid = roottobn(&mnt->data, 0) * dirsperblk; + fileid += denode.de_diroffset / sizeof(struct direntry); + } + + fsp->fileid = fileid; + return 1; +} |
