1765 lines
42 KiB
C
1765 lines
42 KiB
C
/*
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* modified for EXT2FS support in Lites 1.1
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*
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* Aug 1995, Godmar Back (gback@cs.utah.edu)
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* University of Utah, Department of Computer Science
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*/
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/*
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* Copyright (c) 1982, 1986, 1989, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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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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* @(#)ufs_vnops.c 8.7 (Berkeley) 2/3/94
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* @(#)ufs_vnops.c 8.27 (Berkeley) 5/27/95
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* $FreeBSD$
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*/
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#include "opt_suiddir.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/resourcevar.h>
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#include <sys/kernel.h>
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#include <sys/fcntl.h>
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#include <sys/stat.h>
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#include <sys/bio.h>
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#include <sys/buf.h>
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#include <sys/proc.h>
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#include <sys/mount.h>
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#include <sys/unistd.h>
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#include <sys/time.h>
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#include <sys/vnode.h>
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#include <sys/namei.h>
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#include <sys/lockf.h>
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#include <sys/event.h>
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#include <sys/conf.h>
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#include <sys/file.h>
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#include <vm/vm.h>
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#include <vm/vm_extern.h>
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#include <vm/vnode_pager.h>
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#include <fs/fifofs/fifo.h>
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#include <sys/signalvar.h>
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#include <ufs/ufs/dir.h>
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#include <gnu/ext2fs/inode.h>
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#include <gnu/ext2fs/ext2_mount.h>
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#include <gnu/ext2fs/ext2_fs_sb.h>
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#include <gnu/ext2fs/fs.h>
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#include <gnu/ext2fs/ext2_extern.h>
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#include <gnu/ext2fs/ext2_fs.h>
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static int ext2_makeinode(int mode, struct vnode *, struct vnode **, struct componentname *);
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static vop_access_t ext2_access;
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static vop_advlock_t ext2_advlock;
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static int ext2_chmod(struct vnode *, int, struct ucred *, struct thread *);
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static int ext2_chown(struct vnode *, uid_t, gid_t, struct ucred *,
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struct thread *);
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static vop_close_t ext2_close;
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static vop_create_t ext2_create;
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static vop_fsync_t ext2_fsync;
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static vop_getattr_t ext2_getattr;
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static vop_kqfilter_t ext2_kqfilter;
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static vop_link_t ext2_link;
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static vop_mkdir_t ext2_mkdir;
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static vop_mknod_t ext2_mknod;
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static vop_open_t ext2_open;
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static vop_pathconf_t ext2_pathconf;
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static vop_print_t ext2_print;
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static vop_read_t ext2_read;
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static vop_readlink_t ext2_readlink;
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static vop_remove_t ext2_remove;
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static vop_rename_t ext2_rename;
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static vop_rmdir_t ext2_rmdir;
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static vop_setattr_t ext2_setattr;
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static vop_strategy_t ext2_strategy;
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static vop_symlink_t ext2_symlink;
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static vop_write_t ext2_write;
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static vop_close_t ext2fifo_close;
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static vop_kqfilter_t ext2fifo_kqfilter;
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static int filt_ext2read(struct knote *kn, long hint);
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static int filt_ext2write(struct knote *kn, long hint);
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static int filt_ext2vnode(struct knote *kn, long hint);
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static void filt_ext2detach(struct knote *kn);
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/* Global vfs data structures for ext2. */
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struct vop_vector ext2_vnodeops = {
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.vop_default = &default_vnodeops,
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.vop_access = ext2_access,
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.vop_advlock = ext2_advlock,
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.vop_bmap = ext2_bmap,
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.vop_cachedlookup = ext2_lookup,
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.vop_close = ext2_close,
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.vop_create = ext2_create,
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.vop_fsync = ext2_fsync,
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.vop_getattr = ext2_getattr,
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.vop_inactive = ext2_inactive,
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.vop_link = ext2_link,
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.vop_lookup = vfs_cache_lookup,
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.vop_mkdir = ext2_mkdir,
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.vop_mknod = ext2_mknod,
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.vop_open = ext2_open,
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.vop_pathconf = ext2_pathconf,
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.vop_poll = vop_stdpoll,
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.vop_kqfilter = ext2_kqfilter,
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.vop_print = ext2_print,
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.vop_read = ext2_read,
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.vop_readdir = ext2_readdir,
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.vop_readlink = ext2_readlink,
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.vop_reallocblks = ext2_reallocblks,
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.vop_reclaim = ext2_reclaim,
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.vop_remove = ext2_remove,
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.vop_rename = ext2_rename,
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.vop_rmdir = ext2_rmdir,
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.vop_setattr = ext2_setattr,
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.vop_strategy = ext2_strategy,
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.vop_symlink = ext2_symlink,
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.vop_write = ext2_write,
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};
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struct vop_vector ext2_fifoops = {
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.vop_default = &fifo_specops,
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.vop_access = ext2_access,
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.vop_close = ext2fifo_close,
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.vop_fsync = ext2_fsync,
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.vop_getattr = ext2_getattr,
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.vop_inactive = ext2_inactive,
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.vop_kqfilter = ext2fifo_kqfilter,
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.vop_print = ext2_print,
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.vop_read = VOP_PANIC,
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.vop_reclaim = ext2_reclaim,
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.vop_setattr = ext2_setattr,
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.vop_write = VOP_PANIC,
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};
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#include <gnu/ext2fs/ext2_readwrite.c>
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/*
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* A virgin directory (no blushing please).
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* Note that the type and namlen fields are reversed relative to ext2.
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* Also, we don't use `struct odirtemplate', since it would just cause
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* endianness problems.
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*/
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static struct dirtemplate mastertemplate = {
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0, 12, 1, EXT2_FT_DIR, ".",
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0, DIRBLKSIZ - 12, 2, EXT2_FT_DIR, ".."
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};
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static struct dirtemplate omastertemplate = {
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0, 12, 1, EXT2_FT_UNKNOWN, ".",
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0, DIRBLKSIZ - 12, 2, EXT2_FT_UNKNOWN, ".."
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};
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void
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ext2_itimes(vp)
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struct vnode *vp;
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{
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struct inode *ip;
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struct timespec ts;
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ip = VTOI(vp);
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if ((ip->i_flag & (IN_ACCESS | IN_CHANGE | IN_UPDATE)) == 0)
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return;
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if ((vp->v_type == VBLK || vp->v_type == VCHR))
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ip->i_flag |= IN_LAZYMOD;
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else
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ip->i_flag |= IN_MODIFIED;
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if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
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vfs_timestamp(&ts);
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if (ip->i_flag & IN_ACCESS) {
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ip->i_atime = ts.tv_sec;
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ip->i_atimensec = ts.tv_nsec;
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}
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if (ip->i_flag & IN_UPDATE) {
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ip->i_mtime = ts.tv_sec;
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ip->i_mtimensec = ts.tv_nsec;
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ip->i_modrev++;
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}
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if (ip->i_flag & IN_CHANGE) {
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ip->i_ctime = ts.tv_sec;
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ip->i_ctimensec = ts.tv_nsec;
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}
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}
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ip->i_flag &= ~(IN_ACCESS | IN_CHANGE | IN_UPDATE);
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}
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/*
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* Create a regular file
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*/
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static int
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ext2_create(ap)
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struct vop_create_args /* {
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struct vnode *a_dvp;
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struct vnode **a_vpp;
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struct componentname *a_cnp;
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struct vattr *a_vap;
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} */ *ap;
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{
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int error;
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error =
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ext2_makeinode(MAKEIMODE(ap->a_vap->va_type, ap->a_vap->va_mode),
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ap->a_dvp, ap->a_vpp, ap->a_cnp);
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if (error)
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return (error);
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return (0);
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}
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/*
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* Open called.
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*
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* Nothing to do.
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*/
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static int
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ext2_open(ap)
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struct vop_open_args /* {
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struct vnode *a_vp;
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int a_mode;
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struct ucred *a_cred;
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struct thread *a_td;
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} */ *ap;
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{
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if (ap->a_vp->v_type == VBLK || ap->a_vp->v_type == VCHR)
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return (EOPNOTSUPP);
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/*
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* Files marked append-only must be opened for appending.
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*/
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if ((VTOI(ap->a_vp)->i_flags & APPEND) &&
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(ap->a_mode & (FWRITE | O_APPEND)) == FWRITE)
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return (EPERM);
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return (0);
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}
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/*
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* Close called.
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*
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* Update the times on the inode.
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*/
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static int
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ext2_close(ap)
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struct vop_close_args /* {
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struct vnode *a_vp;
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int a_fflag;
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struct ucred *a_cred;
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struct thread *a_td;
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} */ *ap;
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{
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struct vnode *vp = ap->a_vp;
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struct mount *mp;
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VI_LOCK(vp);
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if (vp->v_usecount > 1) {
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ext2_itimes(vp);
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VI_UNLOCK(vp);
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} else {
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VI_UNLOCK(vp);
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/*
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* If we are closing the last reference to an unlinked
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* file, then it will be freed by the inactive routine.
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* Because the freeing causes a the filesystem to be
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* modified, it must be held up during periods when the
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* filesystem is suspended.
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*
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* XXX - EAGAIN is returned to prevent vn_close from
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* repeating the vrele operation.
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*/
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if (vp->v_type == VREG && VTOI(vp)->i_nlink == 0) {
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(void) vn_start_write(vp, &mp, V_WAIT);
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vrele(vp);
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vn_finished_write(mp);
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return (EAGAIN);
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}
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}
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return (0);
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}
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static int
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ext2_access(ap)
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struct vop_access_args /* {
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struct vnode *a_vp;
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int a_mode;
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struct ucred *a_cred;
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struct thread *a_td;
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} */ *ap;
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{
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struct vnode *vp = ap->a_vp;
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struct inode *ip = VTOI(vp);
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mode_t mode = ap->a_mode;
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int error;
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if (vp->v_type == VBLK || vp->v_type == VCHR)
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return (EOPNOTSUPP);
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/*
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* Disallow write attempts on read-only file systems;
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* unless the file is a socket, fifo, or a block or
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* character device resident on the file system.
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*/
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if (mode & VWRITE) {
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switch (vp->v_type) {
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case VDIR:
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case VLNK:
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case VREG:
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if (vp->v_mount->mnt_flag & MNT_RDONLY)
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return (EROFS);
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break;
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default:
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break;
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}
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}
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/* If immutable bit set, nobody gets to write it. */
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if ((mode & VWRITE) && (ip->i_flags & (IMMUTABLE | SF_SNAPSHOT)))
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return (EPERM);
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error = vaccess(vp->v_type, ip->i_mode, ip->i_uid, ip->i_gid,
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ap->a_mode, ap->a_cred, NULL);
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return (error);
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}
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static int
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ext2_getattr(ap)
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struct vop_getattr_args /* {
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struct vnode *a_vp;
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struct vattr *a_vap;
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struct ucred *a_cred;
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struct thread *a_td;
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} */ *ap;
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{
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struct vnode *vp = ap->a_vp;
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struct inode *ip = VTOI(vp);
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struct vattr *vap = ap->a_vap;
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ext2_itimes(vp);
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/*
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* Copy from inode table
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*/
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vap->va_fsid = dev2udev(ip->i_dev);
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vap->va_fileid = ip->i_number;
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vap->va_mode = ip->i_mode & ~IFMT;
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vap->va_nlink = ip->i_nlink;
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vap->va_uid = ip->i_uid;
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vap->va_gid = ip->i_gid;
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vap->va_rdev = ip->i_rdev;
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vap->va_size = ip->i_size;
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vap->va_atime.tv_sec = ip->i_atime;
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vap->va_atime.tv_nsec = ip->i_atimensec;
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vap->va_mtime.tv_sec = ip->i_mtime;
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vap->va_mtime.tv_nsec = ip->i_mtimensec;
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vap->va_ctime.tv_sec = ip->i_ctime;
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vap->va_ctime.tv_nsec = ip->i_ctimensec;
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vap->va_flags = ip->i_flags;
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vap->va_gen = ip->i_gen;
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vap->va_blocksize = vp->v_mount->mnt_stat.f_iosize;
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vap->va_bytes = dbtob((u_quad_t)ip->i_blocks);
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vap->va_type = IFTOVT(ip->i_mode);
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vap->va_filerev = ip->i_modrev;
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return (0);
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}
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|
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/*
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* Set attribute vnode op. called from several syscalls
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*/
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static int
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ext2_setattr(ap)
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struct vop_setattr_args /* {
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struct vnode *a_vp;
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struct vattr *a_vap;
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struct ucred *a_cred;
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struct thread *a_td;
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} */ *ap;
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{
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struct vattr *vap = ap->a_vap;
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struct vnode *vp = ap->a_vp;
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struct inode *ip = VTOI(vp);
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struct ucred *cred = ap->a_cred;
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struct thread *td = ap->a_td;
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int error;
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/*
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* Check for unsettable attributes.
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*/
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if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) ||
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(vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) ||
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(vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) ||
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((int)vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) {
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return (EINVAL);
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}
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if (vap->va_flags != VNOVAL) {
|
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if (vp->v_mount->mnt_flag & MNT_RDONLY)
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return (EROFS);
|
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/*
|
|
* Callers may only modify the file flags on objects they
|
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* have VADMIN rights for.
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|
*/
|
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if ((error = VOP_ACCESS(vp, VADMIN, cred, td)))
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|
return (error);
|
|
/*
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|
* Unprivileged processes and privileged processes in
|
|
* jail() are not permitted to unset system flags, or
|
|
* modify flags if any system flags are set.
|
|
* Privileged non-jail processes may not modify system flags
|
|
* if securelevel > 0 and any existing system flags are set.
|
|
*/
|
|
if (!suser_cred(cred, SUSER_ALLOWJAIL)) {
|
|
if (ip->i_flags
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& (SF_NOUNLINK | SF_IMMUTABLE | SF_APPEND)) {
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error = securelevel_gt(cred, 0);
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if (error)
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return (error);
|
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}
|
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ip->i_flags = vap->va_flags;
|
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} else {
|
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if (ip->i_flags
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& (SF_NOUNLINK | SF_IMMUTABLE | SF_APPEND) ||
|
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(vap->va_flags & UF_SETTABLE) != vap->va_flags)
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return (EPERM);
|
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ip->i_flags &= SF_SETTABLE;
|
|
ip->i_flags |= (vap->va_flags & UF_SETTABLE);
|
|
}
|
|
ip->i_flag |= IN_CHANGE;
|
|
if (vap->va_flags & (IMMUTABLE | APPEND))
|
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return (0);
|
|
}
|
|
if (ip->i_flags & (IMMUTABLE | APPEND))
|
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return (EPERM);
|
|
/*
|
|
* Go through the fields and update iff not VNOVAL.
|
|
*/
|
|
if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) {
|
|
if (vp->v_mount->mnt_flag & MNT_RDONLY)
|
|
return (EROFS);
|
|
if ((error = ext2_chown(vp, vap->va_uid, vap->va_gid, cred,
|
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td)) != 0)
|
|
return (error);
|
|
}
|
|
if (vap->va_size != VNOVAL) {
|
|
/*
|
|
* Disallow write attempts on read-only file systems;
|
|
* unless the file is a socket, fifo, or a block or
|
|
* character device resident on the file system.
|
|
*/
|
|
switch (vp->v_type) {
|
|
case VDIR:
|
|
return (EISDIR);
|
|
case VLNK:
|
|
case VREG:
|
|
if (vp->v_mount->mnt_flag & MNT_RDONLY)
|
|
return (EROFS);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
if ((error = ext2_truncate(vp, vap->va_size, 0, cred, td)) != 0)
|
|
return (error);
|
|
}
|
|
if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
|
|
if (vp->v_mount->mnt_flag & MNT_RDONLY)
|
|
return (EROFS);
|
|
/*
|
|
* From utimes(2):
|
|
* If times is NULL, ... The caller must be the owner of
|
|
* the file, have permission to write the file, or be the
|
|
* super-user.
|
|
* If times is non-NULL, ... The caller must be the owner of
|
|
* the file or be the super-user.
|
|
*/
|
|
if ((error = VOP_ACCESS(vp, VADMIN, cred, td)) &&
|
|
((vap->va_vaflags & VA_UTIMES_NULL) == 0 ||
|
|
(error = VOP_ACCESS(vp, VWRITE, cred, td))))
|
|
return (error);
|
|
if (vap->va_atime.tv_sec != VNOVAL)
|
|
ip->i_flag |= IN_ACCESS;
|
|
if (vap->va_mtime.tv_sec != VNOVAL)
|
|
ip->i_flag |= IN_CHANGE | IN_UPDATE;
|
|
ext2_itimes(vp);
|
|
if (vap->va_atime.tv_sec != VNOVAL) {
|
|
ip->i_atime = vap->va_atime.tv_sec;
|
|
ip->i_atimensec = vap->va_atime.tv_nsec;
|
|
}
|
|
if (vap->va_mtime.tv_sec != VNOVAL) {
|
|
ip->i_mtime = vap->va_mtime.tv_sec;
|
|
ip->i_mtimensec = vap->va_mtime.tv_nsec;
|
|
}
|
|
error = ext2_update(vp, 0);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
error = 0;
|
|
if (vap->va_mode != (mode_t)VNOVAL) {
|
|
if (vp->v_mount->mnt_flag & MNT_RDONLY)
|
|
return (EROFS);
|
|
error = ext2_chmod(vp, (int)vap->va_mode, cred, td);
|
|
}
|
|
VN_KNOTE_UNLOCKED(vp, NOTE_ATTRIB);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Change the mode on a file.
|
|
* Inode must be locked before calling.
|
|
*/
|
|
static int
|
|
ext2_chmod(vp, mode, cred, td)
|
|
struct vnode *vp;
|
|
int mode;
|
|
struct ucred *cred;
|
|
struct thread *td;
|
|
{
|
|
struct inode *ip = VTOI(vp);
|
|
int error;
|
|
|
|
/*
|
|
* To modify the permissions on a file, must possess VADMIN
|
|
* for that file.
|
|
*/
|
|
if ((error = VOP_ACCESS(vp, VADMIN, cred, td)))
|
|
return (error);
|
|
/*
|
|
* Privileged processes may set the sticky bit on non-directories,
|
|
* as well as set the setgid bit on a file with a group that the
|
|
* process is not a member of.
|
|
*/
|
|
if (suser_cred(cred, SUSER_ALLOWJAIL)) {
|
|
if (vp->v_type != VDIR && (mode & S_ISTXT))
|
|
return (EFTYPE);
|
|
if (!groupmember(ip->i_gid, cred) && (mode & ISGID))
|
|
return (EPERM);
|
|
}
|
|
ip->i_mode &= ~ALLPERMS;
|
|
ip->i_mode |= (mode & ALLPERMS);
|
|
ip->i_flag |= IN_CHANGE;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Perform chown operation on inode ip;
|
|
* inode must be locked prior to call.
|
|
*/
|
|
static int
|
|
ext2_chown(vp, uid, gid, cred, td)
|
|
struct vnode *vp;
|
|
uid_t uid;
|
|
gid_t gid;
|
|
struct ucred *cred;
|
|
struct thread *td;
|
|
{
|
|
struct inode *ip = VTOI(vp);
|
|
uid_t ouid;
|
|
gid_t ogid;
|
|
int error = 0;
|
|
|
|
if (uid == (uid_t)VNOVAL)
|
|
uid = ip->i_uid;
|
|
if (gid == (gid_t)VNOVAL)
|
|
gid = ip->i_gid;
|
|
/*
|
|
* To modify the ownership of a file, must possess VADMIN
|
|
* for that file.
|
|
*/
|
|
if ((error = VOP_ACCESS(vp, VADMIN, cred, td)))
|
|
return (error);
|
|
/*
|
|
* To change the owner of a file, or change the group of a file
|
|
* to a group of which we are not a member, the caller must
|
|
* have privilege.
|
|
*/
|
|
if ((uid != ip->i_uid ||
|
|
(gid != ip->i_gid && !groupmember(gid, cred))) &&
|
|
(error = suser_cred(cred, SUSER_ALLOWJAIL)))
|
|
return (error);
|
|
ogid = ip->i_gid;
|
|
ouid = ip->i_uid;
|
|
ip->i_gid = gid;
|
|
ip->i_uid = uid;
|
|
ip->i_flag |= IN_CHANGE;
|
|
if (suser_cred(cred, SUSER_ALLOWJAIL) && (ouid != uid || ogid != gid))
|
|
ip->i_mode &= ~(ISUID | ISGID);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Synch an open file.
|
|
*/
|
|
/* ARGSUSED */
|
|
static int
|
|
ext2_fsync(ap)
|
|
struct vop_fsync_args /* {
|
|
struct vnode *a_vp;
|
|
struct ucred *a_cred;
|
|
int a_waitfor;
|
|
struct thread *a_td;
|
|
} */ *ap;
|
|
{
|
|
/*
|
|
* Flush all dirty buffers associated with a vnode.
|
|
*/
|
|
ext2_discard_prealloc(VTOI(ap->a_vp));
|
|
|
|
vop_stdfsync(ap);
|
|
|
|
return (ext2_update(ap->a_vp, ap->a_waitfor == MNT_WAIT));
|
|
}
|
|
|
|
/*
|
|
* Mknod vnode call
|
|
*/
|
|
/* ARGSUSED */
|
|
static int
|
|
ext2_mknod(ap)
|
|
struct vop_mknod_args /* {
|
|
struct vnode *a_dvp;
|
|
struct vnode **a_vpp;
|
|
struct componentname *a_cnp;
|
|
struct vattr *a_vap;
|
|
} */ *ap;
|
|
{
|
|
struct vattr *vap = ap->a_vap;
|
|
struct vnode **vpp = ap->a_vpp;
|
|
struct inode *ip;
|
|
ino_t ino;
|
|
int error;
|
|
|
|
error = ext2_makeinode(MAKEIMODE(vap->va_type, vap->va_mode),
|
|
ap->a_dvp, vpp, ap->a_cnp);
|
|
if (error)
|
|
return (error);
|
|
ip = VTOI(*vpp);
|
|
ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
|
|
if (vap->va_rdev != VNOVAL) {
|
|
/*
|
|
* Want to be able to use this to make badblock
|
|
* inodes, so don't truncate the dev number.
|
|
*/
|
|
ip->i_rdev = vap->va_rdev;
|
|
}
|
|
/*
|
|
* Remove inode, then reload it through VFS_VGET so it is
|
|
* checked to see if it is an alias of an existing entry in
|
|
* the inode cache.
|
|
*/
|
|
vput(*vpp);
|
|
(*vpp)->v_type = VNON;
|
|
ino = ip->i_number; /* Save this before vgone() invalidates ip. */
|
|
vgone(*vpp);
|
|
error = VFS_VGET(ap->a_dvp->v_mount, ino, LK_EXCLUSIVE, vpp);
|
|
if (error) {
|
|
*vpp = NULL;
|
|
return (error);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
ext2_remove(ap)
|
|
struct vop_remove_args /* {
|
|
struct vnode *a_dvp;
|
|
struct vnode *a_vp;
|
|
struct componentname *a_cnp;
|
|
} */ *ap;
|
|
{
|
|
struct inode *ip;
|
|
struct vnode *vp = ap->a_vp;
|
|
struct vnode *dvp = ap->a_dvp;
|
|
int error;
|
|
|
|
ip = VTOI(vp);
|
|
if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
|
|
(VTOI(dvp)->i_flags & APPEND)) {
|
|
error = EPERM;
|
|
goto out;
|
|
}
|
|
error = ext2_dirremove(dvp, ap->a_cnp);
|
|
if (error == 0) {
|
|
ip->i_nlink--;
|
|
ip->i_flag |= IN_CHANGE;
|
|
}
|
|
out:
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* link vnode call
|
|
*/
|
|
static int
|
|
ext2_link(ap)
|
|
struct vop_link_args /* {
|
|
struct vnode *a_tdvp;
|
|
struct vnode *a_vp;
|
|
struct componentname *a_cnp;
|
|
} */ *ap;
|
|
{
|
|
struct vnode *vp = ap->a_vp;
|
|
struct vnode *tdvp = ap->a_tdvp;
|
|
struct componentname *cnp = ap->a_cnp;
|
|
struct inode *ip;
|
|
int error;
|
|
|
|
#ifdef DIAGNOSTIC
|
|
if ((cnp->cn_flags & HASBUF) == 0)
|
|
panic("ext2_link: no name");
|
|
#endif
|
|
if (tdvp->v_mount != vp->v_mount) {
|
|
error = EXDEV;
|
|
goto out;
|
|
}
|
|
ip = VTOI(vp);
|
|
if ((nlink_t)ip->i_nlink >= LINK_MAX) {
|
|
error = EMLINK;
|
|
goto out;
|
|
}
|
|
if (ip->i_flags & (IMMUTABLE | APPEND)) {
|
|
error = EPERM;
|
|
goto out;
|
|
}
|
|
ip->i_nlink++;
|
|
ip->i_flag |= IN_CHANGE;
|
|
error = ext2_update(vp, 1);
|
|
if (!error)
|
|
error = ext2_direnter(ip, tdvp, cnp);
|
|
if (error) {
|
|
ip->i_nlink--;
|
|
ip->i_flag |= IN_CHANGE;
|
|
}
|
|
out:
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Rename system call.
|
|
* See comments in sys/ufs/ufs/ufs_vnops.c
|
|
*/
|
|
static int
|
|
ext2_rename(ap)
|
|
struct vop_rename_args /* {
|
|
struct vnode *a_fdvp;
|
|
struct vnode *a_fvp;
|
|
struct componentname *a_fcnp;
|
|
struct vnode *a_tdvp;
|
|
struct vnode *a_tvp;
|
|
struct componentname *a_tcnp;
|
|
} */ *ap;
|
|
{
|
|
struct vnode *tvp = ap->a_tvp;
|
|
struct vnode *tdvp = ap->a_tdvp;
|
|
struct vnode *fvp = ap->a_fvp;
|
|
struct vnode *fdvp = ap->a_fdvp;
|
|
struct componentname *tcnp = ap->a_tcnp;
|
|
struct componentname *fcnp = ap->a_fcnp;
|
|
struct thread *td = fcnp->cn_thread;
|
|
struct inode *ip, *xp, *dp;
|
|
struct dirtemplate dirbuf;
|
|
int doingdirectory = 0, oldparent = 0, newparent = 0;
|
|
int error = 0;
|
|
u_char namlen;
|
|
|
|
#ifdef DIAGNOSTIC
|
|
if ((tcnp->cn_flags & HASBUF) == 0 ||
|
|
(fcnp->cn_flags & HASBUF) == 0)
|
|
panic("ext2_rename: no name");
|
|
#endif
|
|
/*
|
|
* Check for cross-device rename.
|
|
*/
|
|
if ((fvp->v_mount != tdvp->v_mount) ||
|
|
(tvp && (fvp->v_mount != tvp->v_mount))) {
|
|
error = EXDEV;
|
|
abortit:
|
|
if (tdvp == tvp)
|
|
vrele(tdvp);
|
|
else
|
|
vput(tdvp);
|
|
if (tvp)
|
|
vput(tvp);
|
|
vrele(fdvp);
|
|
vrele(fvp);
|
|
return (error);
|
|
}
|
|
|
|
if (tvp && ((VTOI(tvp)->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
|
|
(VTOI(tdvp)->i_flags & APPEND))) {
|
|
error = EPERM;
|
|
goto abortit;
|
|
}
|
|
|
|
/*
|
|
* Renaming a file to itself has no effect. The upper layers should
|
|
* not call us in that case. Temporarily just warn if they do.
|
|
*/
|
|
if (fvp == tvp) {
|
|
printf("ext2_rename: fvp == tvp (can't happen)\n");
|
|
error = 0;
|
|
goto abortit;
|
|
}
|
|
|
|
if ((error = vn_lock(fvp, LK_EXCLUSIVE, td)) != 0)
|
|
goto abortit;
|
|
dp = VTOI(fdvp);
|
|
ip = VTOI(fvp);
|
|
if (ip->i_nlink >= LINK_MAX) {
|
|
VOP_UNLOCK(fvp, 0, td);
|
|
error = EMLINK;
|
|
goto abortit;
|
|
}
|
|
if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))
|
|
|| (dp->i_flags & APPEND)) {
|
|
VOP_UNLOCK(fvp, 0, td);
|
|
error = EPERM;
|
|
goto abortit;
|
|
}
|
|
if ((ip->i_mode & IFMT) == IFDIR) {
|
|
/*
|
|
* Avoid ".", "..", and aliases of "." for obvious reasons.
|
|
*/
|
|
if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') ||
|
|
dp == ip || (fcnp->cn_flags | tcnp->cn_flags) & ISDOTDOT ||
|
|
(ip->i_flag & IN_RENAME)) {
|
|
VOP_UNLOCK(fvp, 0, td);
|
|
error = EINVAL;
|
|
goto abortit;
|
|
}
|
|
ip->i_flag |= IN_RENAME;
|
|
oldparent = dp->i_number;
|
|
doingdirectory++;
|
|
}
|
|
vrele(fdvp);
|
|
|
|
/*
|
|
* When the target exists, both the directory
|
|
* and target vnodes are returned locked.
|
|
*/
|
|
dp = VTOI(tdvp);
|
|
xp = NULL;
|
|
if (tvp)
|
|
xp = VTOI(tvp);
|
|
|
|
/*
|
|
* 1) Bump link count while we're moving stuff
|
|
* around. If we crash somewhere before
|
|
* completing our work, the link count
|
|
* may be wrong, but correctable.
|
|
*/
|
|
ip->i_nlink++;
|
|
ip->i_flag |= IN_CHANGE;
|
|
if ((error = ext2_update(fvp, 1)) != 0) {
|
|
VOP_UNLOCK(fvp, 0, td);
|
|
goto bad;
|
|
}
|
|
|
|
/*
|
|
* If ".." must be changed (ie the directory gets a new
|
|
* parent) then the source directory must not be in the
|
|
* directory heirarchy above the target, as this would
|
|
* orphan everything below the source directory. Also
|
|
* the user must have write permission in the source so
|
|
* as to be able to change "..". We must repeat the call
|
|
* to namei, as the parent directory is unlocked by the
|
|
* call to checkpath().
|
|
*/
|
|
error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_thread);
|
|
VOP_UNLOCK(fvp, 0, td);
|
|
if (oldparent != dp->i_number)
|
|
newparent = dp->i_number;
|
|
if (doingdirectory && newparent) {
|
|
if (error) /* write access check above */
|
|
goto bad;
|
|
if (xp != NULL)
|
|
vput(tvp);
|
|
error = ext2_checkpath(ip, dp, tcnp->cn_cred);
|
|
if (error)
|
|
goto out;
|
|
VREF(tdvp);
|
|
error = relookup(tdvp, &tvp, tcnp);
|
|
if (error)
|
|
goto out;
|
|
vrele(tdvp);
|
|
dp = VTOI(tdvp);
|
|
xp = NULL;
|
|
if (tvp)
|
|
xp = VTOI(tvp);
|
|
}
|
|
/*
|
|
* 2) If target doesn't exist, link the target
|
|
* to the source and unlink the source.
|
|
* Otherwise, rewrite the target directory
|
|
* entry to reference the source inode and
|
|
* expunge the original entry's existence.
|
|
*/
|
|
if (xp == NULL) {
|
|
if (dp->i_dev != ip->i_dev)
|
|
panic("ext2_rename: EXDEV");
|
|
/*
|
|
* Account for ".." in new directory.
|
|
* When source and destination have the same
|
|
* parent we don't fool with the link count.
|
|
*/
|
|
if (doingdirectory && newparent) {
|
|
if ((nlink_t)dp->i_nlink >= LINK_MAX) {
|
|
error = EMLINK;
|
|
goto bad;
|
|
}
|
|
dp->i_nlink++;
|
|
dp->i_flag |= IN_CHANGE;
|
|
error = ext2_update(tdvp, 1);
|
|
if (error)
|
|
goto bad;
|
|
}
|
|
error = ext2_direnter(ip, tdvp, tcnp);
|
|
if (error) {
|
|
if (doingdirectory && newparent) {
|
|
dp->i_nlink--;
|
|
dp->i_flag |= IN_CHANGE;
|
|
(void)ext2_update(tdvp, 1);
|
|
}
|
|
goto bad;
|
|
}
|
|
vput(tdvp);
|
|
} else {
|
|
if (xp->i_dev != dp->i_dev || xp->i_dev != ip->i_dev)
|
|
panic("ext2_rename: EXDEV");
|
|
/*
|
|
* Short circuit rename(foo, foo).
|
|
*/
|
|
if (xp->i_number == ip->i_number)
|
|
panic("ext2_rename: same file");
|
|
/*
|
|
* If the parent directory is "sticky", then the user must
|
|
* own the parent directory, or the destination of the rename,
|
|
* otherwise the destination may not be changed (except by
|
|
* root). This implements append-only directories.
|
|
*/
|
|
if ((dp->i_mode & S_ISTXT) && tcnp->cn_cred->cr_uid != 0 &&
|
|
tcnp->cn_cred->cr_uid != dp->i_uid &&
|
|
xp->i_uid != tcnp->cn_cred->cr_uid) {
|
|
error = EPERM;
|
|
goto bad;
|
|
}
|
|
/*
|
|
* Target must be empty if a directory and have no links
|
|
* to it. Also, ensure source and target are compatible
|
|
* (both directories, or both not directories).
|
|
*/
|
|
if ((xp->i_mode&IFMT) == IFDIR) {
|
|
if (! ext2_dirempty(xp, dp->i_number, tcnp->cn_cred) ||
|
|
xp->i_nlink > 2) {
|
|
error = ENOTEMPTY;
|
|
goto bad;
|
|
}
|
|
if (!doingdirectory) {
|
|
error = ENOTDIR;
|
|
goto bad;
|
|
}
|
|
cache_purge(tdvp);
|
|
} else if (doingdirectory) {
|
|
error = EISDIR;
|
|
goto bad;
|
|
}
|
|
error = ext2_dirrewrite(dp, ip, tcnp);
|
|
if (error)
|
|
goto bad;
|
|
/*
|
|
* If the target directory is in the same
|
|
* directory as the source directory,
|
|
* decrement the link count on the parent
|
|
* of the target directory.
|
|
*/
|
|
if (doingdirectory && !newparent) {
|
|
dp->i_nlink--;
|
|
dp->i_flag |= IN_CHANGE;
|
|
}
|
|
vput(tdvp);
|
|
/*
|
|
* Adjust the link count of the target to
|
|
* reflect the dirrewrite above. If this is
|
|
* a directory it is empty and there are
|
|
* no links to it, so we can squash the inode and
|
|
* any space associated with it. We disallowed
|
|
* renaming over top of a directory with links to
|
|
* it above, as the remaining link would point to
|
|
* a directory without "." or ".." entries.
|
|
*/
|
|
xp->i_nlink--;
|
|
if (doingdirectory) {
|
|
if (--xp->i_nlink != 0)
|
|
panic("ext2_rename: linked directory");
|
|
error = ext2_truncate(tvp, (off_t)0, IO_SYNC,
|
|
tcnp->cn_cred, tcnp->cn_thread);
|
|
}
|
|
xp->i_flag |= IN_CHANGE;
|
|
vput(tvp);
|
|
xp = NULL;
|
|
}
|
|
|
|
/*
|
|
* 3) Unlink the source.
|
|
*/
|
|
fcnp->cn_flags &= ~MODMASK;
|
|
fcnp->cn_flags |= LOCKPARENT | LOCKLEAF;
|
|
VREF(fdvp);
|
|
error = relookup(fdvp, &fvp, fcnp);
|
|
if (error == 0)
|
|
vrele(fdvp);
|
|
if (fvp != NULL) {
|
|
xp = VTOI(fvp);
|
|
dp = VTOI(fdvp);
|
|
} else {
|
|
/*
|
|
* From name has disappeared.
|
|
*/
|
|
if (doingdirectory)
|
|
panic("ext2_rename: lost dir entry");
|
|
vrele(ap->a_fvp);
|
|
return (0);
|
|
}
|
|
/*
|
|
* Ensure that the directory entry still exists and has not
|
|
* changed while the new name has been entered. If the source is
|
|
* a file then the entry may have been unlinked or renamed. In
|
|
* either case there is no further work to be done. If the source
|
|
* is a directory then it cannot have been rmdir'ed; its link
|
|
* count of three would cause a rmdir to fail with ENOTEMPTY.
|
|
* The IN_RENAME flag ensures that it cannot be moved by another
|
|
* rename.
|
|
*/
|
|
if (xp != ip) {
|
|
if (doingdirectory)
|
|
panic("ext2_rename: lost dir entry");
|
|
} else {
|
|
/*
|
|
* If the source is a directory with a
|
|
* new parent, the link count of the old
|
|
* parent directory must be decremented
|
|
* and ".." set to point to the new parent.
|
|
*/
|
|
if (doingdirectory && newparent) {
|
|
dp->i_nlink--;
|
|
dp->i_flag |= IN_CHANGE;
|
|
error = vn_rdwr(UIO_READ, fvp, (caddr_t)&dirbuf,
|
|
sizeof (struct dirtemplate), (off_t)0,
|
|
UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK,
|
|
tcnp->cn_cred, NOCRED, (int *)0,
|
|
(struct thread *)0);
|
|
if (error == 0) {
|
|
/* Like ufs little-endian: */
|
|
namlen = dirbuf.dotdot_type;
|
|
if (namlen != 2 ||
|
|
dirbuf.dotdot_name[0] != '.' ||
|
|
dirbuf.dotdot_name[1] != '.') {
|
|
ext2_dirbad(xp, (doff_t)12,
|
|
"rename: mangled dir");
|
|
} else {
|
|
dirbuf.dotdot_ino = newparent;
|
|
(void) vn_rdwr(UIO_WRITE, fvp,
|
|
(caddr_t)&dirbuf,
|
|
sizeof (struct dirtemplate),
|
|
(off_t)0, UIO_SYSSPACE,
|
|
IO_NODELOCKED | IO_SYNC |
|
|
IO_NOMACCHECK, tcnp->cn_cred,
|
|
NOCRED, (int *)0,
|
|
(struct thread *)0);
|
|
cache_purge(fdvp);
|
|
}
|
|
}
|
|
}
|
|
error = ext2_dirremove(fdvp, fcnp);
|
|
if (!error) {
|
|
xp->i_nlink--;
|
|
xp->i_flag |= IN_CHANGE;
|
|
}
|
|
xp->i_flag &= ~IN_RENAME;
|
|
}
|
|
if (dp)
|
|
vput(fdvp);
|
|
if (xp)
|
|
vput(fvp);
|
|
vrele(ap->a_fvp);
|
|
return (error);
|
|
|
|
bad:
|
|
if (xp)
|
|
vput(ITOV(xp));
|
|
vput(ITOV(dp));
|
|
out:
|
|
if (doingdirectory)
|
|
ip->i_flag &= ~IN_RENAME;
|
|
if (vn_lock(fvp, LK_EXCLUSIVE, td) == 0) {
|
|
ip->i_nlink--;
|
|
ip->i_flag |= IN_CHANGE;
|
|
ip->i_flag &= ~IN_RENAME;
|
|
vput(fvp);
|
|
} else
|
|
vrele(fvp);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Mkdir system call
|
|
*/
|
|
static int
|
|
ext2_mkdir(ap)
|
|
struct vop_mkdir_args /* {
|
|
struct vnode *a_dvp;
|
|
struct vnode **a_vpp;
|
|
struct componentname *a_cnp;
|
|
struct vattr *a_vap;
|
|
} */ *ap;
|
|
{
|
|
struct vnode *dvp = ap->a_dvp;
|
|
struct vattr *vap = ap->a_vap;
|
|
struct componentname *cnp = ap->a_cnp;
|
|
struct inode *ip, *dp;
|
|
struct vnode *tvp;
|
|
struct dirtemplate dirtemplate, *dtp;
|
|
int error, dmode;
|
|
|
|
#ifdef DIAGNOSTIC
|
|
if ((cnp->cn_flags & HASBUF) == 0)
|
|
panic("ext2_mkdir: no name");
|
|
#endif
|
|
dp = VTOI(dvp);
|
|
if ((nlink_t)dp->i_nlink >= LINK_MAX) {
|
|
error = EMLINK;
|
|
goto out;
|
|
}
|
|
dmode = vap->va_mode & 0777;
|
|
dmode |= IFDIR;
|
|
/*
|
|
* Must simulate part of ext2_makeinode here to acquire the inode,
|
|
* but not have it entered in the parent directory. The entry is
|
|
* made later after writing "." and ".." entries.
|
|
*/
|
|
error = ext2_valloc(dvp, dmode, cnp->cn_cred, &tvp);
|
|
if (error)
|
|
goto out;
|
|
ip = VTOI(tvp);
|
|
ip->i_gid = dp->i_gid;
|
|
#ifdef SUIDDIR
|
|
{
|
|
/*
|
|
* if we are hacking owners here, (only do this where told to)
|
|
* and we are not giving it TOO root, (would subvert quotas)
|
|
* then go ahead and give it to the other user.
|
|
* The new directory also inherits the SUID bit.
|
|
* If user's UID and dir UID are the same,
|
|
* 'give it away' so that the SUID is still forced on.
|
|
*/
|
|
if ( (dvp->v_mount->mnt_flag & MNT_SUIDDIR) &&
|
|
(dp->i_mode & ISUID) && dp->i_uid) {
|
|
dmode |= ISUID;
|
|
ip->i_uid = dp->i_uid;
|
|
} else {
|
|
ip->i_uid = cnp->cn_cred->cr_uid;
|
|
}
|
|
}
|
|
#else
|
|
ip->i_uid = cnp->cn_cred->cr_uid;
|
|
#endif
|
|
ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
|
|
ip->i_mode = dmode;
|
|
tvp->v_type = VDIR; /* Rest init'd in getnewvnode(). */
|
|
ip->i_nlink = 2;
|
|
if (cnp->cn_flags & ISWHITEOUT)
|
|
ip->i_flags |= UF_OPAQUE;
|
|
error = ext2_update(tvp, 1);
|
|
|
|
/*
|
|
* Bump link count in parent directory
|
|
* to reflect work done below. Should
|
|
* be done before reference is created
|
|
* so reparation is possible if we crash.
|
|
*/
|
|
dp->i_nlink++;
|
|
dp->i_flag |= IN_CHANGE;
|
|
error = ext2_update(dvp, 1);
|
|
if (error)
|
|
goto bad;
|
|
|
|
/* Initialize directory with "." and ".." from static template. */
|
|
if (EXT2_HAS_INCOMPAT_FEATURE(ip->i_e2fs->s_es,
|
|
EXT2_FEATURE_INCOMPAT_FILETYPE))
|
|
dtp = &mastertemplate;
|
|
else
|
|
dtp = &omastertemplate;
|
|
dirtemplate = *dtp;
|
|
dirtemplate.dot_ino = ip->i_number;
|
|
dirtemplate.dotdot_ino = dp->i_number;
|
|
/* note that in ext2 DIRBLKSIZ == blocksize, not DEV_BSIZE
|
|
* so let's just redefine it - for this function only
|
|
*/
|
|
#undef DIRBLKSIZ
|
|
#define DIRBLKSIZ VTOI(dvp)->i_e2fs->s_blocksize
|
|
dirtemplate.dotdot_reclen = DIRBLKSIZ - 12;
|
|
error = vn_rdwr(UIO_WRITE, tvp, (caddr_t)&dirtemplate,
|
|
sizeof (dirtemplate), (off_t)0, UIO_SYSSPACE,
|
|
IO_NODELOCKED | IO_SYNC | IO_NOMACCHECK, cnp->cn_cred, NOCRED,
|
|
(int *)0, (struct thread *)0);
|
|
if (error) {
|
|
dp->i_nlink--;
|
|
dp->i_flag |= IN_CHANGE;
|
|
goto bad;
|
|
}
|
|
if (DIRBLKSIZ > VFSTOEXT2(dvp->v_mount)->um_mountp->mnt_stat.f_bsize)
|
|
/* XXX should grow with balloc() */
|
|
panic("ext2_mkdir: blksize");
|
|
else {
|
|
ip->i_size = DIRBLKSIZ;
|
|
ip->i_flag |= IN_CHANGE;
|
|
}
|
|
|
|
/* Directory set up, now install its entry in the parent directory. */
|
|
error = ext2_direnter(ip, dvp, cnp);
|
|
if (error) {
|
|
dp->i_nlink--;
|
|
dp->i_flag |= IN_CHANGE;
|
|
}
|
|
bad:
|
|
/*
|
|
* No need to do an explicit VOP_TRUNCATE here, vrele will do this
|
|
* for us because we set the link count to 0.
|
|
*/
|
|
if (error) {
|
|
ip->i_nlink = 0;
|
|
ip->i_flag |= IN_CHANGE;
|
|
vput(tvp);
|
|
} else
|
|
*ap->a_vpp = tvp;
|
|
out:
|
|
return (error);
|
|
#undef DIRBLKSIZ
|
|
#define DIRBLKSIZ DEV_BSIZE
|
|
}
|
|
|
|
/*
|
|
* Rmdir system call.
|
|
*/
|
|
static int
|
|
ext2_rmdir(ap)
|
|
struct vop_rmdir_args /* {
|
|
struct vnode *a_dvp;
|
|
struct vnode *a_vp;
|
|
struct componentname *a_cnp;
|
|
} */ *ap;
|
|
{
|
|
struct vnode *vp = ap->a_vp;
|
|
struct vnode *dvp = ap->a_dvp;
|
|
struct componentname *cnp = ap->a_cnp;
|
|
struct thread *td = cnp->cn_thread;
|
|
struct inode *ip, *dp;
|
|
int error;
|
|
|
|
ip = VTOI(vp);
|
|
dp = VTOI(dvp);
|
|
|
|
/*
|
|
* Verify the directory is empty (and valid).
|
|
* (Rmdir ".." won't be valid since
|
|
* ".." will contain a reference to
|
|
* the current directory and thus be
|
|
* non-empty.)
|
|
*/
|
|
error = 0;
|
|
if (ip->i_nlink != 2 || !ext2_dirempty(ip, dp->i_number, cnp->cn_cred)) {
|
|
error = ENOTEMPTY;
|
|
goto out;
|
|
}
|
|
if ((dp->i_flags & APPEND)
|
|
|| (ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))) {
|
|
error = EPERM;
|
|
goto out;
|
|
}
|
|
/*
|
|
* Delete reference to directory before purging
|
|
* inode. If we crash in between, the directory
|
|
* will be reattached to lost+found,
|
|
*/
|
|
error = ext2_dirremove(dvp, cnp);
|
|
if (error)
|
|
goto out;
|
|
dp->i_nlink--;
|
|
dp->i_flag |= IN_CHANGE;
|
|
cache_purge(dvp);
|
|
VOP_UNLOCK(dvp, 0, td);
|
|
/*
|
|
* Truncate inode. The only stuff left
|
|
* in the directory is "." and "..". The
|
|
* "." reference is inconsequential since
|
|
* we're quashing it. The ".." reference
|
|
* has already been adjusted above. We've
|
|
* removed the "." reference and the reference
|
|
* in the parent directory, but there may be
|
|
* other hard links so decrement by 2 and
|
|
* worry about them later.
|
|
*/
|
|
ip->i_nlink -= 2;
|
|
error = ext2_truncate(vp, (off_t)0, IO_SYNC, cnp->cn_cred, td);
|
|
cache_purge(ITOV(ip));
|
|
vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY, td);
|
|
out:
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* symlink -- make a symbolic link
|
|
*/
|
|
static int
|
|
ext2_symlink(ap)
|
|
struct vop_symlink_args /* {
|
|
struct vnode *a_dvp;
|
|
struct vnode **a_vpp;
|
|
struct componentname *a_cnp;
|
|
struct vattr *a_vap;
|
|
char *a_target;
|
|
} */ *ap;
|
|
{
|
|
struct vnode *vp, **vpp = ap->a_vpp;
|
|
struct inode *ip;
|
|
int len, error;
|
|
|
|
error = ext2_makeinode(IFLNK | ap->a_vap->va_mode, ap->a_dvp,
|
|
vpp, ap->a_cnp);
|
|
if (error)
|
|
return (error);
|
|
vp = *vpp;
|
|
len = strlen(ap->a_target);
|
|
if (len < vp->v_mount->mnt_maxsymlinklen) {
|
|
ip = VTOI(vp);
|
|
bcopy(ap->a_target, (char *)ip->i_shortlink, len);
|
|
ip->i_size = len;
|
|
ip->i_flag |= IN_CHANGE | IN_UPDATE;
|
|
} else
|
|
error = vn_rdwr(UIO_WRITE, vp, ap->a_target, len, (off_t)0,
|
|
UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK,
|
|
ap->a_cnp->cn_cred, NOCRED, (int *)0, (struct thread *)0);
|
|
if (error)
|
|
vput(vp);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Return target name of a symbolic link
|
|
*/
|
|
static int
|
|
ext2_readlink(ap)
|
|
struct vop_readlink_args /* {
|
|
struct vnode *a_vp;
|
|
struct uio *a_uio;
|
|
struct ucred *a_cred;
|
|
} */ *ap;
|
|
{
|
|
struct vnode *vp = ap->a_vp;
|
|
struct inode *ip = VTOI(vp);
|
|
int isize;
|
|
|
|
isize = ip->i_size;
|
|
if (isize < vp->v_mount->mnt_maxsymlinklen) {
|
|
uiomove((char *)ip->i_shortlink, isize, ap->a_uio);
|
|
return (0);
|
|
}
|
|
return (VOP_READ(vp, ap->a_uio, 0, ap->a_cred));
|
|
}
|
|
|
|
/*
|
|
* Calculate the logical to physical mapping if not done already,
|
|
* then call the device strategy routine.
|
|
*
|
|
* In order to be able to swap to a file, the ext2_bmaparray() operation may not
|
|
* deadlock on memory. See ext2_bmap() for details.
|
|
*/
|
|
static int
|
|
ext2_strategy(ap)
|
|
struct vop_strategy_args /* {
|
|
struct vnode *a_vp;
|
|
struct buf *a_bp;
|
|
} */ *ap;
|
|
{
|
|
struct buf *bp = ap->a_bp;
|
|
struct vnode *vp = ap->a_vp;
|
|
struct inode *ip;
|
|
struct bufobj *bo;
|
|
int32_t blkno;
|
|
int error;
|
|
|
|
ip = VTOI(vp);
|
|
if (vp->v_type == VBLK || vp->v_type == VCHR)
|
|
panic("ext2_strategy: spec");
|
|
if (bp->b_blkno == bp->b_lblkno) {
|
|
error = ext2_bmaparray(vp, bp->b_lblkno, &blkno, NULL, NULL);
|
|
bp->b_blkno = blkno;
|
|
if (error) {
|
|
bp->b_error = error;
|
|
bp->b_ioflags |= BIO_ERROR;
|
|
bufdone(bp);
|
|
return (error);
|
|
}
|
|
if ((long)bp->b_blkno == -1)
|
|
vfs_bio_clrbuf(bp);
|
|
}
|
|
if ((long)bp->b_blkno == -1) {
|
|
bufdone(bp);
|
|
return (0);
|
|
}
|
|
bp->b_iooffset = dbtob(bp->b_blkno);
|
|
bo = VFSTOEXT2(vp->v_mount)->um_bo;
|
|
bo->bo_ops->bop_strategy(bo, bp);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Print out the contents of an inode.
|
|
*/
|
|
static int
|
|
ext2_print(ap)
|
|
struct vop_print_args /* {
|
|
struct vnode *a_vp;
|
|
} */ *ap;
|
|
{
|
|
struct vnode *vp = ap->a_vp;
|
|
struct inode *ip = VTOI(vp);
|
|
|
|
printf("\tino %lu, on dev %s (%d, %d)", (u_long)ip->i_number,
|
|
devtoname(ip->i_dev), major(ip->i_dev), minor(ip->i_dev));
|
|
if (vp->v_type == VFIFO)
|
|
fifo_printinfo(vp);
|
|
printf("\n");
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Close wrapper for fifos.
|
|
*
|
|
* Update the times on the inode then do device close.
|
|
*/
|
|
static int
|
|
ext2fifo_close(ap)
|
|
struct vop_close_args /* {
|
|
struct vnode *a_vp;
|
|
int a_fflag;
|
|
struct ucred *a_cred;
|
|
struct thread *a_td;
|
|
} */ *ap;
|
|
{
|
|
struct vnode *vp = ap->a_vp;
|
|
|
|
VI_LOCK(vp);
|
|
if (vp->v_usecount > 1)
|
|
ext2_itimes(vp);
|
|
VI_UNLOCK(vp);
|
|
return (fifo_specops.vop_close(ap));
|
|
}
|
|
|
|
/*
|
|
* Kqfilter wrapper for fifos.
|
|
*
|
|
* Fall through to ext2 kqfilter routines if needed
|
|
*/
|
|
static int
|
|
ext2fifo_kqfilter(ap)
|
|
struct vop_kqfilter_args *ap;
|
|
{
|
|
int error;
|
|
|
|
error = fifo_specops.vop_kqfilter(ap);
|
|
if (error)
|
|
error = ext2_kqfilter(ap);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Return POSIX pathconf information applicable to ext2 filesystems.
|
|
*/
|
|
static int
|
|
ext2_pathconf(ap)
|
|
struct vop_pathconf_args /* {
|
|
struct vnode *a_vp;
|
|
int a_name;
|
|
int *a_retval;
|
|
} */ *ap;
|
|
{
|
|
|
|
switch (ap->a_name) {
|
|
case _PC_LINK_MAX:
|
|
*ap->a_retval = LINK_MAX;
|
|
return (0);
|
|
case _PC_NAME_MAX:
|
|
*ap->a_retval = NAME_MAX;
|
|
return (0);
|
|
case _PC_PATH_MAX:
|
|
*ap->a_retval = PATH_MAX;
|
|
return (0);
|
|
case _PC_PIPE_BUF:
|
|
*ap->a_retval = PIPE_BUF;
|
|
return (0);
|
|
case _PC_CHOWN_RESTRICTED:
|
|
*ap->a_retval = 1;
|
|
return (0);
|
|
case _PC_NO_TRUNC:
|
|
*ap->a_retval = 1;
|
|
return (0);
|
|
default:
|
|
return (EINVAL);
|
|
}
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
/*
|
|
* Advisory record locking support
|
|
*/
|
|
static int
|
|
ext2_advlock(ap)
|
|
struct vop_advlock_args /* {
|
|
struct vnode *a_vp;
|
|
caddr_t a_id;
|
|
int a_op;
|
|
struct flock *a_fl;
|
|
int a_flags;
|
|
} */ *ap;
|
|
{
|
|
struct inode *ip = VTOI(ap->a_vp);
|
|
|
|
return (lf_advlock(ap, &(ip->i_lockf), ip->i_size));
|
|
}
|
|
|
|
/*
|
|
* Initialize the vnode associated with a new inode, handle aliased
|
|
* vnodes.
|
|
*/
|
|
int
|
|
ext2_vinit(mntp, fifoops, vpp)
|
|
struct mount *mntp;
|
|
struct vop_vector *fifoops;
|
|
struct vnode **vpp;
|
|
{
|
|
struct inode *ip;
|
|
struct vnode *vp;
|
|
|
|
vp = *vpp;
|
|
ip = VTOI(vp);
|
|
vp->v_type = IFTOVT(ip->i_mode);
|
|
if (vp->v_type == VFIFO)
|
|
vp->v_op = fifoops;
|
|
|
|
if (ip->i_number == ROOTINO)
|
|
vp->v_vflag |= VV_ROOT;
|
|
ip->i_modrev = init_va_filerev();
|
|
*vpp = vp;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Allocate a new inode.
|
|
*/
|
|
static int
|
|
ext2_makeinode(mode, dvp, vpp, cnp)
|
|
int mode;
|
|
struct vnode *dvp;
|
|
struct vnode **vpp;
|
|
struct componentname *cnp;
|
|
{
|
|
struct inode *ip, *pdir;
|
|
struct vnode *tvp;
|
|
int error;
|
|
|
|
pdir = VTOI(dvp);
|
|
#ifdef DIAGNOSTIC
|
|
if ((cnp->cn_flags & HASBUF) == 0)
|
|
panic("ext2_makeinode: no name");
|
|
#endif
|
|
*vpp = NULL;
|
|
if ((mode & IFMT) == 0)
|
|
mode |= IFREG;
|
|
|
|
error = ext2_valloc(dvp, mode, cnp->cn_cred, &tvp);
|
|
if (error) {
|
|
return (error);
|
|
}
|
|
ip = VTOI(tvp);
|
|
ip->i_gid = pdir->i_gid;
|
|
#ifdef SUIDDIR
|
|
{
|
|
/*
|
|
* if we are
|
|
* not the owner of the directory,
|
|
* and we are hacking owners here, (only do this where told to)
|
|
* and we are not giving it TOO root, (would subvert quotas)
|
|
* then go ahead and give it to the other user.
|
|
* Note that this drops off the execute bits for security.
|
|
*/
|
|
if ( (dvp->v_mount->mnt_flag & MNT_SUIDDIR) &&
|
|
(pdir->i_mode & ISUID) &&
|
|
(pdir->i_uid != cnp->cn_cred->cr_uid) && pdir->i_uid) {
|
|
ip->i_uid = pdir->i_uid;
|
|
mode &= ~07111;
|
|
} else {
|
|
ip->i_uid = cnp->cn_cred->cr_uid;
|
|
}
|
|
}
|
|
#else
|
|
ip->i_uid = cnp->cn_cred->cr_uid;
|
|
#endif
|
|
ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
|
|
ip->i_mode = mode;
|
|
tvp->v_type = IFTOVT(mode); /* Rest init'd in getnewvnode(). */
|
|
ip->i_nlink = 1;
|
|
if ((ip->i_mode & ISGID) && !groupmember(ip->i_gid, cnp->cn_cred) &&
|
|
suser_cred(cnp->cn_cred, SUSER_ALLOWJAIL))
|
|
ip->i_mode &= ~ISGID;
|
|
|
|
if (cnp->cn_flags & ISWHITEOUT)
|
|
ip->i_flags |= UF_OPAQUE;
|
|
|
|
/*
|
|
* Make sure inode goes to disk before directory entry.
|
|
*/
|
|
error = ext2_update(tvp, 1);
|
|
if (error)
|
|
goto bad;
|
|
error = ext2_direnter(ip, dvp, cnp);
|
|
if (error)
|
|
goto bad;
|
|
|
|
*vpp = tvp;
|
|
return (0);
|
|
|
|
bad:
|
|
/*
|
|
* Write error occurred trying to update the inode
|
|
* or the directory so must deallocate the inode.
|
|
*/
|
|
ip->i_nlink = 0;
|
|
ip->i_flag |= IN_CHANGE;
|
|
vput(tvp);
|
|
return (error);
|
|
}
|
|
|
|
static struct filterops ext2read_filtops =
|
|
{ 1, NULL, filt_ext2detach, filt_ext2read };
|
|
static struct filterops ext2write_filtops =
|
|
{ 1, NULL, filt_ext2detach, filt_ext2write };
|
|
static struct filterops ext2vnode_filtops =
|
|
{ 1, NULL, filt_ext2detach, filt_ext2vnode };
|
|
|
|
static int
|
|
ext2_kqfilter(ap)
|
|
struct vop_kqfilter_args /* {
|
|
struct vnode *a_vp;
|
|
struct knote *a_kn;
|
|
} */ *ap;
|
|
{
|
|
struct vnode *vp = ap->a_vp;
|
|
struct knote *kn = ap->a_kn;
|
|
|
|
switch (kn->kn_filter) {
|
|
case EVFILT_READ:
|
|
kn->kn_fop = &ext2read_filtops;
|
|
break;
|
|
case EVFILT_WRITE:
|
|
kn->kn_fop = &ext2write_filtops;
|
|
break;
|
|
case EVFILT_VNODE:
|
|
kn->kn_fop = &ext2vnode_filtops;
|
|
break;
|
|
default:
|
|
return (1);
|
|
}
|
|
|
|
kn->kn_hook = (caddr_t)vp;
|
|
|
|
if (vp->v_pollinfo == NULL)
|
|
v_addpollinfo(vp);
|
|
if (vp->v_pollinfo == NULL)
|
|
return ENOMEM;
|
|
knlist_add(&vp->v_pollinfo->vpi_selinfo.si_note, kn, 0);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
filt_ext2detach(struct knote *kn)
|
|
{
|
|
struct vnode *vp = (struct vnode *)kn->kn_hook;
|
|
|
|
KASSERT(vp->v_pollinfo != NULL, ("Mising v_pollinfo"));
|
|
knlist_remove(&vp->v_pollinfo->vpi_selinfo.si_note, kn, 0);
|
|
}
|
|
|
|
/*ARGSUSED*/
|
|
static int
|
|
filt_ext2read(struct knote *kn, long hint)
|
|
{
|
|
struct vnode *vp = (struct vnode *)kn->kn_hook;
|
|
struct inode *ip = VTOI(vp);
|
|
|
|
/*
|
|
* filesystem is gone, so set the EOF flag and schedule
|
|
* the knote for deletion.
|
|
*/
|
|
if (hint == NOTE_REVOKE) {
|
|
kn->kn_flags |= (EV_EOF | EV_ONESHOT);
|
|
return (1);
|
|
}
|
|
|
|
kn->kn_data = ip->i_size - kn->kn_fp->f_offset;
|
|
return (kn->kn_data != 0);
|
|
}
|
|
|
|
/*ARGSUSED*/
|
|
static int
|
|
filt_ext2write(struct knote *kn, long hint)
|
|
{
|
|
|
|
/*
|
|
* filesystem is gone, so set the EOF flag and schedule
|
|
* the knote for deletion.
|
|
*/
|
|
if (hint == NOTE_REVOKE)
|
|
kn->kn_flags |= (EV_EOF | EV_ONESHOT);
|
|
|
|
kn->kn_data = 0;
|
|
return (1);
|
|
}
|
|
|
|
static int
|
|
filt_ext2vnode(struct knote *kn, long hint)
|
|
{
|
|
|
|
if (kn->kn_sfflags & hint)
|
|
kn->kn_fflags |= hint;
|
|
if (hint == NOTE_REVOKE) {
|
|
kn->kn_flags |= EV_EOF;
|
|
return (1);
|
|
}
|
|
return (kn->kn_fflags != 0);
|
|
}
|