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ext2fs_vnops.c
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ext2fs_vnops.c
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/* $NetBSD: ext2fs_vnops.c,v 1.117 2015/04/20 23:03:09 riastradh Exp $ */
/*
* Copyright (c) 1982, 1986, 1989, 1993
* The Regents of the University of California. All rights reserved.
* (c) UNIX System Laboratories, Inc.
* All or some portions of this file are derived from material licensed
* to the University of California by American Telephone and Telegraph
* Co. or Unix System Laboratories, Inc. and are reproduced herein with
* the permission of UNIX System Laboratories, Inc.
*
* 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. 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.
*
* @(#)ufs_vnops.c 8.14 (Berkeley) 10/26/94
* Modified for ext2fs by Manuel Bouyer.
*/
/*
* Copyright (c) 1997 Manuel Bouyer.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*
* @(#)ufs_vnops.c 8.14 (Berkeley) 10/26/94
* Modified for ext2fs by Manuel Bouyer.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ext2fs_vnops.c,v 1.117 2015/04/20 23:03:09 riastradh Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/resourcevar.h>
#include <sys/kernel.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/buf.h>
#include <sys/proc.h>
#include <sys/mount.h>
#include <sys/namei.h>
#include <sys/vnode.h>
#include <sys/lockf.h>
#include <sys/pool.h>
#include <sys/signalvar.h>
#include <sys/kauth.h>
#include <miscfs/fifofs/fifo.h>
#include <miscfs/genfs/genfs.h>
#include <miscfs/specfs/specdev.h>
#include <ufs/ufs/inode.h>
#include <ufs/ufs/ufs_extern.h>
#include <ufs/ufs/ufsmount.h>
#include <ufs/ext2fs/ext2fs.h>
#include <ufs/ext2fs/ext2fs_extern.h>
#include <ufs/ext2fs/ext2fs_dir.h>
extern int prtactive;
static int ext2fs_chmod(struct vnode *, int, kauth_cred_t, struct lwp *);
static int ext2fs_chown(struct vnode *, uid_t, gid_t, kauth_cred_t,
struct lwp *);
union _qcvt {
int64_t qcvt;
int32_t val[2];
};
#define SETHIGH(q, h) { \
union _qcvt tmp; \
tmp.qcvt = (q); \
tmp.val[_QUAD_HIGHWORD] = (h); \
(q) = tmp.qcvt; \
}
#define SETLOW(q, l) { \
union _qcvt tmp; \
tmp.qcvt = (q); \
tmp.val[_QUAD_LOWWORD] = (l); \
(q) = tmp.qcvt; \
}
/*
* Create a regular file
*/
int
ext2fs_create(void *v)
{
// printf("In file: %s, fun: %s,lineno: %d\n",__FILE__, __func__, __LINE__);
struct vop_create_v3_args /* {
struct vnode *a_dvp;
struct vnode **a_vpp;
struct componentname *a_cnp;
struct vattr *a_vap;
} */ *ap = v;
int error;
error =
ext2fs_makeinode(MAKEIMODE(ap->a_vap->va_type, ap->a_vap->va_mode),
ap->a_dvp, ap->a_vpp, ap->a_cnp);
if (error)
return (error);
VN_KNOTE(ap->a_dvp, NOTE_WRITE);
VOP_UNLOCK(*ap->a_vpp);
return (0);
}
/*
* Mknod vnode call
*/
/* ARGSUSED */
int
ext2fs_mknod(void *v)
{
// printf("In file: %s, fun: %s,lineno: %d\n",__FILE__, __func__, __LINE__);
struct vop_mknod_v3_args /* {
struct vnode *a_dvp;
struct vnode **a_vpp;
struct componentname *a_cnp;
struct vattr *a_vap;
} */ *ap = v;
struct vattr *vap = ap->a_vap;
struct vnode **vpp = ap->a_vpp;
struct inode *ip;
int error;
struct mount *mp;
ino_t ino;
if ((error = ext2fs_makeinode(MAKEIMODE(vap->va_type, vap->va_mode),
ap->a_dvp, vpp, ap->a_cnp)) != 0)
return (error);
VN_KNOTE(ap->a_dvp, NOTE_WRITE);
ip = VTOI(*vpp);
mp = (*vpp)->v_mount;
ino = ip->i_number;
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_din.e2fs_din->e2di_rdev = h2fs32(vap->va_rdev);
}
/*
* Remove inode so that it will be reloaded by vcache_get and
* checked to see if it is an alias of an existing entry in
* the inode cache.
*/
(*vpp)->v_type = VNON;
VOP_UNLOCK(*vpp);
vgone(*vpp);
error = vcache_get(mp, &ino, sizeof(ino), vpp);
if (error != 0) {
*vpp = NULL;
return (error);
}
return (0);
}
/*
* Open called.
*
* Just check the APPEND flag.
*/
/* ARGSUSED */
int
ext2fs_open(void *v)
{
// printf("In file: %s, fun: %s,lineno: %d\n",__FILE__, __func__, __LINE__);
struct vop_open_args /* {
struct vnode *a_vp;
int a_mode;
kauth_cred_t a_cred;
} */ *ap = v;
/*
* Files marked append-only must be opened for appending.
*/
// printf("In file: %s, fun: %s,lineno: %d\n",__FILE__, __func__, __LINE__);
if ((VTOI(ap->a_vp)->i_e2fs_flags & EXT2_APPEND) &&
(ap->a_mode & (FWRITE | O_APPEND)) == FWRITE)
return (EPERM);
// printf("In file: %s, fun: %s,lineno: %d\n",__FILE__, __func__, __LINE__);
return (0);
}
static int
ext2fs_check_possible(struct vnode *vp, struct inode *ip, mode_t mode)
{
// printf("In file: %s, fun: %s,lineno: %d\n",__FILE__, __func__, __LINE__);
/*
* 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.
*/
if (mode & VWRITE) {
switch (vp->v_type) {
case VDIR:
case VLNK:
case VREG:
if (vp->v_mount->mnt_flag & MNT_RDONLY)
return (EROFS);
break;
default:
break;
}
}
/* If immutable bit set, nobody gets to write it. */
if ((mode & VWRITE) && (ip->i_e2fs_flags & EXT2_IMMUTABLE))
return (EPERM);
return 0;
}
static int
ext2fs_check_permitted(struct vnode *vp, struct inode *ip, mode_t mode,
kauth_cred_t cred)
{
// printf("In file: %s, fun: %s,lineno: %d\n",__FILE__, __func__, __LINE__);
return kauth_authorize_vnode(cred, KAUTH_ACCESS_ACTION(mode, vp->v_type,
ip->i_e2fs_mode & ALLPERMS), vp, NULL, genfs_can_access(vp->v_type,
ip->i_e2fs_mode & ALLPERMS, ip->i_uid, ip->i_gid, mode, cred));
}
int
ext2fs_access(void *v)
{
// printf("In file: %s, fun: %s,lineno: %d\n",__FILE__, __func__, __LINE__);
struct vop_access_args /* {
struct vnode *a_vp;
int a_mode;
kauth_cred_t a_cred;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
struct inode *ip = VTOI(vp);
mode_t mode = ap->a_mode;
int error;
error = ext2fs_check_possible(vp, ip, mode);
if (error)
return error;
error = ext2fs_check_permitted(vp, ip, mode, ap->a_cred);
// printf("In file: %s, fun: %s,lineno: %d\n",__FILE__, __func__, __LINE__);
return error;
}
/* ARGSUSED */
int
ext2fs_getattr(void *v)
{
// printf("In file: %s, fun: %s,lineno: %d\n",__FILE__, __func__, __LINE__);
struct vop_getattr_args /* {
struct vnode *a_vp;
struct vattr *a_vap;
kauth_cred_t a_cred;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
struct inode *ip = VTOI(vp);
struct vattr *vap = ap->a_vap;
EXT2FS_ITIMES(ip, NULL, NULL, NULL);
/*
* Copy from inode table
*/
vap->va_fsid = ip->i_dev;
vap->va_fileid = ip->i_number;
vap->va_mode = ip->i_e2fs_mode & ALLPERMS;
vap->va_nlink = ip->i_e2fs_nlink;
vap->va_uid = ip->i_uid;
vap->va_gid = ip->i_gid;
vap->va_rdev = (dev_t)fs2h32(ip->i_din.e2fs_din->e2di_rdev);
vap->va_size = vp->v_size;
vap->va_atime.tv_sec = ip->i_e2fs_atime;
vap->va_atime.tv_nsec = 0;
vap->va_mtime.tv_sec = ip->i_e2fs_mtime;
vap->va_mtime.tv_nsec = 0;
vap->va_ctime.tv_sec = ip->i_e2fs_ctime;
vap->va_ctime.tv_nsec = 0;
#ifdef EXT2FS_SYSTEM_FLAGS
vap->va_flags = (ip->i_e2fs_flags & EXT2_APPEND) ? SF_APPEND : 0;
vap->va_flags |= (ip->i_e2fs_flags & EXT2_IMMUTABLE) ? SF_IMMUTABLE : 0;
#else
vap->va_flags = (ip->i_e2fs_flags & EXT2_APPEND) ? UF_APPEND : 0;
vap->va_flags |= (ip->i_e2fs_flags & EXT2_IMMUTABLE) ? UF_IMMUTABLE : 0;
#endif
vap->va_gen = ip->i_e2fs_gen;
/* this doesn't belong here */
if (vp->v_type == VBLK)
vap->va_blocksize = BLKDEV_IOSIZE;
else if (vp->v_type == VCHR)
vap->va_blocksize = MAXBSIZE;
else
vap->va_blocksize = vp->v_mount->mnt_stat.f_iosize;
vap->va_bytes = dbtob(ext2fs_nblock(ip));
vap->va_type = vp->v_type;
vap->va_filerev = ip->i_modrev;
return (0);
}
/*
* Set attribute vnode op. called from several syscalls
*/
int
ext2fs_setattr(void *v)
{
// printf("In file: %s, fun: %s,lineno: %d\n",__FILE__, __func__, __LINE__);
struct vop_setattr_args /* {
struct vnode *a_vp;
struct vattr *a_vap;
kauth_cred_t a_cred;
} */ *ap = v;
struct vattr *vap = ap->a_vap;
struct vnode *vp = ap->a_vp;
struct inode *ip = VTOI(vp);
kauth_cred_t cred = ap->a_cred;
struct lwp *l = curlwp;
int error;
kauth_action_t action = KAUTH_VNODE_WRITE_FLAGS;
bool changing_sysflags = false;
/*
* Check for unsettable attributes.
*/
if ((vap->va_type != VNON) || (vap->va_nlink != (nlink_t)VNOVAL) ||
(vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) ||
(vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) ||
((int)vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) {
return (EINVAL);
}
if (vap->va_flags != VNOVAL) {
if (vp->v_mount->mnt_flag & MNT_RDONLY)
return (EROFS);
/*
* Check if we're allowed to change the flags.
* If EXT2FS_SYSTEM_FLAGS is set, then the flags are treated
* as system flags, otherwise they're considered to be user
* flags.
*/
#ifdef EXT2FS_SYSTEM_FLAGS
/* Indicate we're changing system flags if we are. */
if ((vap->va_flags & SF_APPEND) ||
(vap->va_flags & SF_IMMUTABLE)) {
action |= KAUTH_VNODE_WRITE_SYSFLAGS;
changing_sysflags = true;
}
/* Indicate the node has system flags if it does. */
if (ip->i_e2fs_flags & (EXT2_APPEND | EXT2_IMMUTABLE)) {
action |= KAUTH_VNODE_HAS_SYSFLAGS;
}
#endif /* EXT2FS_SYSTEM_FLAGS */
error = kauth_authorize_vnode(cred, action, vp, NULL,
genfs_can_chflags(cred, vp->v_type, ip->i_uid,
changing_sysflags));
if (error)
return (error);
#ifdef EXT2FS_SYSTEM_FLAGS
ip->i_e2fs_flags &= ~(EXT2_APPEND | EXT2_IMMUTABLE);
ip->i_e2fs_flags |=
(vap->va_flags & SF_APPEND) ? EXT2_APPEND : 0 |
(vap->va_flags & SF_IMMUTABLE) ? EXT2_IMMUTABLE : 0;
#else
ip->i_e2fs_flags &= ~(EXT2_APPEND | EXT2_IMMUTABLE);
ip->i_e2fs_flags |=
(vap->va_flags & UF_APPEND) ? EXT2_APPEND : 0 |
(vap->va_flags & UF_IMMUTABLE) ? EXT2_IMMUTABLE : 0;
#endif
ip->i_flag |= IN_CHANGE;
if (vap->va_flags & (IMMUTABLE | APPEND))
return (0);
}
if (ip->i_e2fs_flags & (EXT2_APPEND | EXT2_IMMUTABLE))
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);
error = ext2fs_chown(vp, vap->va_uid, vap->va_gid, cred, l);
if (error)
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);
default:
break;
}
error = ext2fs_truncate(vp, vap->va_size, 0, cred);
if (error)
return (error);
}
ip = VTOI(vp);
if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
if (vp->v_mount->mnt_flag & MNT_RDONLY)
return (EROFS);
error = kauth_authorize_vnode(cred, KAUTH_VNODE_WRITE_TIMES, vp,
NULL, genfs_can_chtimes(vp, vap->va_vaflags, ip->i_uid,
cred));
if (error)
return (error);
if (vap->va_atime.tv_sec != VNOVAL)
if (!(vp->v_mount->mnt_flag & MNT_NOATIME))
ip->i_flag |= IN_ACCESS;
if (vap->va_mtime.tv_sec != VNOVAL) {
ip->i_flag |= IN_CHANGE | IN_UPDATE;
if (vp->v_mount->mnt_flag & MNT_RELATIME)
ip->i_flag |= IN_ACCESS;
}
error = ext2fs_update(vp, &vap->va_atime, &vap->va_mtime,
UPDATE_WAIT);
if (error)
return (error);
}
error = 0;
if (vap->va_mode != (mode_t)VNOVAL) {
if (vp->v_mount->mnt_flag & MNT_RDONLY)
return (EROFS);
error = ext2fs_chmod(vp, (int)vap->va_mode, cred, l);
}
VN_KNOTE(vp, NOTE_ATTRIB);
return (error);
}
/*
* Change the mode on a file.
* Inode must be locked before calling.
*/
static int
ext2fs_chmod(struct vnode *vp, int mode, kauth_cred_t cred, struct lwp *l)
{
// printf("In file: %s, fun: %s,lineno: %d\n",__FILE__, __func__, __LINE__);
struct inode *ip = VTOI(vp);
int error;
error = kauth_authorize_vnode(cred, KAUTH_VNODE_WRITE_SECURITY, vp,
NULL, genfs_can_chmod(vp->v_type, cred, ip->i_uid, ip->i_gid,
mode));
if (error)
return (error);
ip->i_e2fs_mode &= ~ALLPERMS;
ip->i_e2fs_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
ext2fs_chown(struct vnode *vp, uid_t uid, gid_t gid, kauth_cred_t cred,
struct lwp *l)
{
// printf("In file: %s, fun: %s,lineno: %d\n",__FILE__, __func__, __LINE__);
struct inode *ip = VTOI(vp);
uid_t ouid;
gid_t ogid;
int error;
if (uid == (uid_t)VNOVAL)
uid = ip->i_uid;
if (gid == (gid_t)VNOVAL)
gid = ip->i_gid;
error = kauth_authorize_vnode(cred, KAUTH_VNODE_CHANGE_OWNERSHIP, vp,
NULL, genfs_can_chown(cred, ip->i_uid, ip->i_gid, uid, gid));
if (error)
return (error);
ogid = ip->i_gid;
ouid = ip->i_uid;
ip->i_e2fs_gid = gid & 0xffff;
ip->i_e2fs_uid = uid & 0xffff;
if (ip->i_e2fs->e2fs.e2fs_rev > E2FS_REV0) {
ip->i_e2fs_gid_high = (gid >> 16) & 0xffff;
ip->i_e2fs_uid_high = (uid >> 16) & 0xffff;
} else {
ip->i_e2fs_gid_high = 0;
ip->i_e2fs_uid_high = 0;
}
if (ouid != uid || ogid != gid) {
ext2fs_set_inode_guid(ip);
ip->i_flag |= IN_CHANGE;
}
if (ouid != uid && (ip->i_e2fs_mode & ISUID) &&
kauth_authorize_vnode(cred, KAUTH_VNODE_RETAIN_SUID,
vp, NULL, EPERM) != 0)
ip->i_e2fs_mode &= ~ISUID;
if (ogid != gid && (ip->i_e2fs_mode & ISGID) &&
kauth_authorize_vnode(cred, KAUTH_VNODE_RETAIN_SGID,
vp, NULL, EPERM) != 0)
ip->i_e2fs_mode &= ~ISGID;
return (0);
}
int
ext2fs_remove(void *v)
{
// printf("In file: %s, fun: %s,lineno: %d\n",__FILE__, __func__, __LINE__);
struct vop_remove_args /* {
struct vnode *a_dvp;
struct vnode *a_vp;
struct componentname *a_cnp;
} */ *ap = v;
struct inode *ip;
struct vnode *vp = ap->a_vp;
struct vnode *dvp = ap->a_dvp;
struct ufs_lookup_results *ulr;
int error;
/* XXX should handle this material another way */
ulr = &VTOI(dvp)->i_crap;
UFS_CHECK_CRAPCOUNTER(VTOI(dvp));
ip = VTOI(vp);
if (vp->v_type == VDIR ||
(ip->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND)) ||
(VTOI(dvp)->i_e2fs_flags & EXT2_APPEND)) {
error = EPERM;
} else {
error = ext2fs_dirremove(dvp, ulr, ap->a_cnp);
if (error == 0) {
ip->i_e2fs_nlink--;
ip->i_flag |= IN_CHANGE;
}
}
VN_KNOTE(vp, NOTE_DELETE);
VN_KNOTE(dvp, NOTE_WRITE);
if (dvp == vp)
vrele(vp);
else
vput(vp);
vput(dvp);
return (error);
}
/*
* ext2fs_link: create hard link.
*/
int
ext2fs_link(void *v)
{
// printf("In file: %s, fun: %s,lineno: %d\n",__FILE__, __func__, __LINE__);
struct vop_link_v2_args /* {
struct vnode *a_dvp;
struct vnode *a_vp;
struct componentname *a_cnp;
} */ *ap = v;
struct vnode *dvp = ap->a_dvp;
struct vnode *vp = ap->a_vp;
struct componentname *cnp = ap->a_cnp;
struct inode *ip;
int error;
struct ufs_lookup_results *ulr;
KASSERT(dvp != vp);
KASSERT(vp->v_type != VDIR);
KASSERT(dvp->v_mount == vp->v_mount);
/* XXX should handle this material another way */
ulr = &VTOI(dvp)->i_crap;
UFS_CHECK_CRAPCOUNTER(VTOI(dvp));
error = vn_lock(vp, LK_EXCLUSIVE);
if (error) {
VOP_ABORTOP(dvp, cnp);
goto out2;
}
ip = VTOI(vp);
if ((nlink_t)ip->i_e2fs_nlink >= LINK_MAX) {
VOP_ABORTOP(dvp, cnp);
error = EMLINK;
goto out1;
}
if (ip->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND)) {
VOP_ABORTOP(dvp, cnp);
error = EPERM;
goto out1;
}
ip->i_e2fs_nlink++;
ip->i_flag |= IN_CHANGE;
error = ext2fs_update(vp, NULL, NULL, UPDATE_WAIT);
if (!error)
error = ext2fs_direnter(ip, dvp, ulr, cnp);
if (error) {
ip->i_e2fs_nlink--;
ip->i_flag |= IN_CHANGE;
}
out1:
VOP_UNLOCK(vp);
out2:
VN_KNOTE(vp, NOTE_LINK);
VN_KNOTE(dvp, NOTE_WRITE);
return (error);
}
/*
* Mkdir system call
*/
int
ext2fs_mkdir(void *v)
{
// printf("In file: %s, fun: %s,lineno: %d\n",__FILE__, __func__, __LINE__);
struct vop_mkdir_v3_args /* {
struct vnode *a_dvp;
struct vnode **a_vpp;
struct componentname *a_cnp;
struct vattr *a_vap;
} */ *ap = v;
struct vnode *dvp = ap->a_dvp;
struct vattr *vap = ap->a_vap;
struct componentname *cnp = ap->a_cnp;
struct inode *ip, *dp = VTOI(dvp);
struct vnode *tvp;
struct ext2fs_dirtemplate dirtemplate;
int error, dmode;
struct ufs_lookup_results *ulr;
/* XXX should handle this material another way */
ulr = &VTOI(dvp)->i_crap;
UFS_CHECK_CRAPCOUNTER(VTOI(dvp));
if ((nlink_t)dp->i_e2fs_nlink >= LINK_MAX) {
error = EMLINK;
goto out;
}
dmode = vap->va_mode & ACCESSPERMS;
dmode |= IFDIR;
/*
* Must simulate part of ext2fs_makeinode here to acquire the inode,
* but not have it entered in the parent directory. The entry is
* made later after writing "." and ".." entries.
*/
if ((error = ext2fs_valloc(dvp, dmode, cnp->cn_cred, &tvp)) != 0)
goto out;
ip = VTOI(tvp);
ip->i_uid = kauth_cred_geteuid(cnp->cn_cred);
ip->i_e2fs_uid = ip->i_uid & 0xffff;
ip->i_e2fs_gid = dp->i_e2fs_gid;
if (ip->i_e2fs->e2fs.e2fs_rev > E2FS_REV0) {
ip->i_e2fs_uid_high = (ip->i_uid >> 16) & 0xffff;
ip->i_e2fs_gid_high = dp->i_e2fs_gid_high;
} else {
ip->i_e2fs_uid_high = 0;
ip->i_e2fs_gid_high = 0;
}
ip->i_gid = ip->i_e2fs_gid | (ip->i_e2fs_gid_high << 16);
ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
ip->i_e2fs_mode = dmode;
tvp->v_type = VDIR; /* Rest init'd in getnewvnode(). */
ip->i_e2fs_nlink = 2;
/*
* 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_e2fs_nlink++;
dp->i_flag |= IN_CHANGE;
if ((error = ext2fs_update(dvp, NULL, NULL, UPDATE_DIROP)) != 0)
goto bad;
/* Initialize directory with "." and ".." from static template. */
memset(&dirtemplate, 0, sizeof(dirtemplate));
dirtemplate.dot_ino = h2fs32(ip->i_number);
dirtemplate.dot_reclen = h2fs16(12);
dirtemplate.dot_namlen = 1;
if (ip->i_e2fs->e2fs.e2fs_rev > E2FS_REV0 &&
(ip->i_e2fs->e2fs.e2fs_features_incompat & EXT2F_INCOMPAT_FTYPE)) {
dirtemplate.dot_type = EXT2_FT_DIR;
}
dirtemplate.dot_name[0] = '.';
dirtemplate.dotdot_ino = h2fs32(dp->i_number);
dirtemplate.dotdot_reclen = h2fs16(VTOI(dvp)->i_e2fs->e2fs_bsize - 12);
dirtemplate.dotdot_namlen = 2;
if (ip->i_e2fs->e2fs.e2fs_rev > E2FS_REV0 &&
(ip->i_e2fs->e2fs.e2fs_features_incompat & EXT2F_INCOMPAT_FTYPE)) {
dirtemplate.dotdot_type = EXT2_FT_DIR;
}
dirtemplate.dotdot_name[0] = dirtemplate.dotdot_name[1] = '.';
error = ufs_bufio(UIO_WRITE, tvp, (void *)&dirtemplate,
sizeof (dirtemplate), (off_t)0, IO_NODELOCKED|IO_SYNC,
cnp->cn_cred, (size_t *)0, NULL);
if (error) {
dp->i_e2fs_nlink--;
dp->i_flag |= IN_CHANGE;
goto bad;
}
if (VTOI(dvp)->i_e2fs->e2fs_bsize > dvp->v_mount->mnt_stat.f_bsize)
panic("ext2fs_mkdir: blksize"); /* XXX should grow with balloc() */
else {
error = ext2fs_setsize(ip, VTOI(dvp)->i_e2fs->e2fs_bsize);
if (error) {
dp->i_e2fs_nlink--;
dp->i_flag |= IN_CHANGE;
goto bad;
}
ip->i_flag |= IN_CHANGE;
uvm_vnp_setsize(tvp, ext2fs_size(ip));
}
/* Directory set up, now install its entry in the parent directory. */
error = ext2fs_direnter(ip, dvp, ulr, cnp);
if (error != 0) {
dp->i_e2fs_nlink--;
dp->i_flag |= IN_CHANGE;
}
bad:
/*
* No need to do an explicit ext2fs_truncate here, vrele will do this
* for us because we set the link count to 0.
*/
if (error) {
ip->i_e2fs_nlink = 0;
ip->i_flag |= IN_CHANGE;
vput(tvp);
} else {
VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK);
VOP_UNLOCK(tvp);
*ap->a_vpp = tvp;
}
out:
return (error);
}
/*
* Rmdir system call.
*/
int
ext2fs_rmdir(void *v)
{
// printf("In file: %s, fun: %s,lineno: %d\n",__FILE__, __func__, __LINE__);
struct vop_rmdir_args /* {
struct vnode *a_dvp;
struct vnode *a_vp;
struct componentname *a_cnp;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
struct vnode *dvp = ap->a_dvp;
struct componentname *cnp = ap->a_cnp;
struct inode *ip, *dp;
int error;
struct ufs_lookup_results *ulr;
ip = VTOI(vp);
dp = VTOI(dvp);
/* XXX should handle this material another way */
ulr = &dp->i_crap;
UFS_CHECK_CRAPCOUNTER(dp);
/*
* No rmdir "." please.
*/
if (dp == ip) {
vrele(dvp);
vput(vp);
return (EINVAL);
}
/*
* 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_e2fs_nlink != 2 ||
!ext2fs_dirempty(ip, dp->i_number, cnp->cn_cred)) {
error = ENOTEMPTY;
goto out;
}
if ((dp->i_e2fs_flags & EXT2_APPEND) ||
(ip->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_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 = ext2fs_dirremove(dvp, ulr, cnp);
if (error != 0)
goto out;
dp->i_e2fs_nlink--;
dp->i_flag |= IN_CHANGE;
VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK);
cache_purge(dvp);
vput(dvp);
dvp = NULL;
/*
* 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_e2fs_nlink -= 2;
error = ext2fs_truncate(vp, (off_t)0, IO_SYNC, cnp->cn_cred);
cache_purge(ITOV(ip));
out:
VN_KNOTE(vp, NOTE_DELETE);
if (dvp)
vput(dvp);
vput(vp);
return (error);
}
/*
* symlink -- make a symbolic link
*/
int
ext2fs_symlink(void *v)
{
// printf("In file: %s, fun: %s,lineno: %d\n",__FILE__, __func__, __LINE__);
struct vop_symlink_v3_args /* {
struct vnode *a_dvp;
struct vnode **a_vpp;
struct componentname *a_cnp;
struct vattr *a_vap;
char *a_target;
} */ *ap = v;
struct vnode *vp, **vpp;
struct inode *ip;
int len, error;
vpp = ap->a_vpp;
error = ext2fs_makeinode(IFLNK | ap->a_vap->va_mode, ap->a_dvp,
vpp, ap->a_cnp);
if (error)
return (error);
VN_KNOTE(ap->a_dvp, NOTE_WRITE);
vp = *vpp;
len = strlen(ap->a_target);
ip = VTOI(vp);
if (len < ip->i_ump->um_maxsymlinklen) {
memcpy((char *)ip->i_din.e2fs_din->e2di_shortlink, ap->a_target, len);
error = ext2fs_setsize(ip, len);
if (error)
goto bad;
ip->i_flag |= IN_CHANGE | IN_UPDATE;
if (vp->v_mount->mnt_flag & MNT_RELATIME)
ip->i_flag |= IN_ACCESS;
uvm_vnp_setsize(vp, len);
} else
error = ufs_bufio(UIO_WRITE, vp, ap->a_target, len, (off_t)0,
IO_NODELOCKED, ap->a_cnp->cn_cred, (size_t *)0, NULL);
bad:
VOP_UNLOCK(vp);
if (error)
vrele(vp);
return (error);
}
/*
* Return target name of a symbolic link
*/
int
ext2fs_readlink(void *v)
{
// printf("In file: %s, fun: %s,lineno: %d\n",__FILE__, __func__, __LINE__);
struct vop_readlink_args /* {
struct vnode *a_vp;
struct uio *a_uio;
kauth_cred_t a_cred;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
struct inode *ip = VTOI(vp);
struct ufsmount *ump = ip->i_ump;
int isize;
isize = ext2fs_size(ip);
if (isize < ump->um_maxsymlinklen ||
(ump->um_maxsymlinklen == 0 && ext2fs_nblock(ip) == 0)) {
uiomove((char *)ip->i_din.e2fs_din->e2di_shortlink, isize, ap->a_uio);
return (0);
}
return (UFS_BUFRD(vp, ap->a_uio, 0, ap->a_cred));
}
/*
* Advisory record locking support
*/
int
ext2fs_advlock(void *v)
{
// printf("In file: %s, fun: %s,lineno: %d\n",__FILE__, __func__, __LINE__);
struct vop_advlock_args /* {
struct vnode *a_vp;
void * a_id;
int a_op;
struct flock *a_fl;
int a_flags;
} */ *ap = v;
struct inode *ip = VTOI(ap->a_vp);
return lf_advlock(ap, &ip->i_lockf, ext2fs_size(ip));
}
int
ext2fs_fsync(void *v)
{
// printf("In file: %s, fun: %s,lineno: %d\n",__FILE__, __func__, __LINE__);
struct vop_fsync_args /* {
struct vnode *a_vp;
kauth_cred_t a_cred;
int a_flags;
off_t offlo;
off_t offhi;
struct proc *a_p;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
int wait;
int error;
wait = (ap->a_flags & FSYNC_WAIT) != 0;
if (vp->v_type == VBLK)
error = spec_fsync(v);
else
error = vflushbuf(vp, ap->a_flags);
if (error == 0 && (ap->a_flags & FSYNC_DATAONLY) == 0)
error = ext2fs_update(vp, NULL, NULL, wait ? UPDATE_WAIT : 0);
if (error == 0 && ap->a_flags & FSYNC_CACHE) {
int l = 0;
error = VOP_IOCTL(VTOI(vp)->i_devvp, DIOCCACHESYNC, &l, FWRITE,
curlwp->l_cred);
}
return error;
}
/*