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src/sys/ufs/ext2fs/ext2fs_vnops.c

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/* $OpenBSD: ext2fs_vnops.c,v 1.93 2024/04/13 23:44:11 jsg Exp $ */
/* $NetBSD: ext2fs_vnops.c,v 1.1 1997/06/11 09:34:09 bouyer Exp $ */
/*
* Copyright (c) 1997 Manuel Bouyer.
* 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.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/resourcevar.h>
#include <sys/kernel.h>
#include <sys/fcntl.h>
#include <sys/stat.h>
#include <sys/proc.h>
#include <sys/conf.h>
#include <sys/mount.h>
#include <sys/namei.h>
#include <sys/vnode.h>
#include <sys/lockf.h>
#include <sys/malloc.h>
#include <sys/pool.h>
#include <sys/signalvar.h>
#include <sys/specdev.h>
#include <sys/unistd.h>
#include <miscfs/fifofs/fifo.h>
#include <ufs/ufs/quota.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>
#include <uvm/uvm_extern.h>
static int ext2fs_chmod(struct vnode *, mode_t, struct ucred *);
static int ext2fs_chown(struct vnode *, uid_t, gid_t, struct ucred *);
/*
* Create a regular file
*/
int
ext2fs_create(void *v)
{
struct vop_create_args *ap = v;
return (ext2fs_makeinode(MAKEIMODE(ap->a_vap->va_type,
ap->a_vap->va_mode), ap->a_dvp, ap->a_vpp, ap->a_cnp));
}
/*
* Mknod vnode call
*/
int
ext2fs_mknod(void *v)
{
struct vop_mknod_args *ap = v;
struct vattr *vap = ap->a_vap;
struct vnode **vpp = ap->a_vpp;
struct inode *ip;
int error;
error = ext2fs_makeinode(MAKEIMODE(vap->va_type, vap->va_mode),
ap->a_dvp, vpp, ap->a_cnp);
if (error != 0)
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_e2din->e2di_rdev = htole32(vap->va_rdev);
}
/*
* Remove inode so that it will be reloaded by VFS_VGET and
* checked to see if it is an alias of an existing entry in
* the inode cache.
*/
vput(*vpp);
(*vpp)->v_type = VNON;
vgone(*vpp);
*vpp = NULL;
return (0);
}
/*
* Open called.
*
* Just check the APPEND flag.
*/
int
ext2fs_open(void *v)
{
struct vop_open_args *ap = v;
/*
* Files marked append-only must be opened for appending.
*/
if ((VTOI(ap->a_vp)->i_e2fs_flags & EXT2_APPEND) &&
(ap->a_mode & (FWRITE | O_APPEND)) == FWRITE)
return (EPERM);
return (0);
}
int
ext2fs_access(void *v)
{
struct vop_access_args *ap = v;
struct vnode *vp = ap->a_vp;
struct inode *ip = VTOI(vp);
mode_t mode = ap->a_mode;
/* If immutable bit set, nobody gets to write it. */
if ((mode & VWRITE) && (ip->i_e2fs_flags & EXT2_IMMUTABLE))
return (EPERM);
return (vaccess(vp->v_type, ip->i_e2fs_mode, ip->i_e2fs_uid,
ip->i_e2fs_gid, mode, ap->a_cred));
}
int
ext2fs_getattr(void *v)
{
struct vop_getattr_args *ap = v;
struct vnode *vp = ap->a_vp;
struct inode *ip = VTOI(vp);
struct vattr *vap = ap->a_vap;
EXT2FS_ITIMES(ip);
/*
* 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_e2fs_uid;
vap->va_gid = ip->i_e2fs_gid;
vap->va_rdev = (dev_t) letoh32(ip->i_e2din->e2di_rdev);
vap->va_size = ext2fs_size(ip);
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((u_quad_t)ip->i_e2fs_nblock);
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)
{
struct vop_setattr_args *ap = v;
struct vattr *vap = ap->a_vap;
struct vnode *vp = ap->a_vp;
struct inode *ip = VTOI(vp);
struct ucred *cred = ap->a_cred;
int error;
/*
* Check for unsettable attributes.
*/
if ((vap->va_type != VNON) || (vap->va_nlink != 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);
if (cred->cr_uid != ip->i_e2fs_uid &&
(error = suser_ucred(cred)))
return (error);
#ifdef EXT2FS_SYSTEM_FLAGS
if (cred->cr_uid == 0) {
if ((ip->i_e2fs_flags &
(EXT2_APPEND | EXT2_IMMUTABLE)) && securelevel > 0)
return (EPERM);
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 {
return (EPERM);
}
#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);
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(ip, vap->va_size, 0, cred);
if (error)
return (error);
}
if ((vap->va_vaflags & VA_UTIMES_CHANGE) ||
vap->va_atime.tv_nsec != VNOVAL ||
vap->va_mtime.tv_nsec != VNOVAL) {
if (vp->v_mount->mnt_flag & MNT_RDONLY)
return (EROFS);
if (cred->cr_uid != ip->i_e2fs_uid &&
(error = suser_ucred(cred)) &&
((vap->va_vaflags & VA_UTIMES_NULL) == 0 ||
(error = VOP_ACCESS(vp, VWRITE, cred, ap->a_p))))
return (error);
if (vap->va_mtime.tv_nsec != VNOVAL)
ip->i_flag |= IN_CHANGE | IN_UPDATE;
else if (vap->va_vaflags & VA_UTIMES_CHANGE)
ip->i_flag |= IN_CHANGE;
if (vap->va_atime.tv_nsec != VNOVAL) {
if (!(vp->v_mount->mnt_flag & MNT_NOATIME) ||
(ip->i_flag & (IN_CHANGE | IN_UPDATE)))
ip->i_flag |= IN_ACCESS;
}
EXT2FS_ITIMES(ip);
if (vap->va_mtime.tv_nsec != VNOVAL)
ip->i_e2fs_mtime = vap->va_mtime.tv_sec;
if (vap->va_atime.tv_nsec != VNOVAL)
ip->i_e2fs_atime = vap->va_atime.tv_sec;
error = ext2fs_update(ip, 1);
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, vap->va_mode, cred);
}
return (error);
}
/*
* Change the mode on a file.
* Inode must be locked before calling.
*/
static int
ext2fs_chmod(struct vnode *vp, mode_t mode, struct ucred *cred)
{
struct inode *ip = VTOI(vp);
int error;
if (cred->cr_uid != ip->i_e2fs_uid && (error = suser_ucred(cred)))
return (error);
if (cred->cr_uid) {
if (vp->v_type != VDIR && (mode & S_ISTXT))
return (EFTYPE);
if (!groupmember(ip->i_e2fs_gid, cred) && (mode & ISGID))
return (EPERM);
}
ip->i_e2fs_mode &= ~ALLPERMS;
ip->i_e2fs_mode |= (mode & ALLPERMS);
ip->i_flag |= IN_CHANGE;
if ((vp->v_flag & VTEXT) && (ip->i_e2fs_mode & S_ISTXT) == 0)
(void) uvm_vnp_uncache(vp);
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, struct ucred *cred)
{
struct inode *ip = VTOI(vp);
uid_t ouid;
gid_t ogid;
int error = 0;
if (uid == (uid_t)VNOVAL)
uid = ip->i_e2fs_uid;
if (gid == (gid_t)VNOVAL)
gid = ip->i_e2fs_gid;
/*
* If we don't own the file, are trying to change the owner
* of the file, or are not a member of the target group,
* the caller must be superuser or the call fails.
*/
if ((cred->cr_uid != ip->i_e2fs_uid || uid != ip->i_e2fs_uid ||
(gid != ip->i_e2fs_gid && !groupmember(gid, cred))) &&
(error = suser_ucred(cred)))
return (error);
ogid = ip->i_e2fs_gid;
ouid = ip->i_e2fs_uid;
ip->i_e2fs_gid = gid;
ip->i_e2fs_uid = uid;
if (ouid != uid || ogid != gid)
ip->i_flag |= IN_CHANGE;
if (ouid != uid && cred->cr_uid != 0)
ip->i_e2fs_mode &= ~ISUID;
if (ogid != gid && cred->cr_uid != 0)
ip->i_e2fs_mode &= ~ISGID;
return (0);
}
int
ext2fs_remove(void *v)
{
struct vop_remove_args *ap = v;
struct inode *ip;
struct vnode *vp = ap->a_vp;
struct vnode *dvp = ap->a_dvp;
int error;
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;
goto out;
}
error = ext2fs_dirremove(dvp, ap->a_cnp);
if (error == 0) {
ip->i_e2fs_nlink--;
ip->i_flag |= IN_CHANGE;
}
out:
if (dvp == vp)
vrele(vp);
else
vput(vp);
vput(dvp);
return (error);
}
/*
* link vnode call
*/
int
ext2fs_link(void *v)
{
struct vop_link_args *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;
#ifdef DIAGNOSTIC
if ((cnp->cn_flags & HASBUF) == 0)
panic("ext2fs_link: no name");
#endif
if (dvp != vp && (error = vn_lock(vp, LK_EXCLUSIVE))) {
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(ip, 1);
if (!error)
error = ext2fs_direnter(ip, dvp, cnp);
if (error) {
ip->i_e2fs_nlink--;
ip->i_flag |= IN_CHANGE;
}
pool_put(&namei_pool, cnp->cn_pnbuf);
out1:
if (dvp != vp)
VOP_UNLOCK(vp);
out2:
vput(dvp);
return (error);
}
/*
* Rename system call.
* rename("foo", "bar");
* is essentially
* unlink("bar");
* link("foo", "bar");
* unlink("foo");
* but ``atomically''. Can't do full commit without saving state in the
* inode on disk which isn't feasible at this time. Best we can do is
* always guarantee the target exists.
*
* Basic algorithm is:
*
* 1) Bump link count on source while we're linking it to the
* target. This also ensure the inode won't be deleted out
* from underneath us while we work (it may be truncated by
* a concurrent `trunc' or `open' for creation).
* 2) Link source to destination. If destination already exists,
* delete it first.
* 3) Unlink source reference to inode if still around. If a
* directory was moved and the parent of the destination
* is different from the source, patch the ".." entry in the
* directory.
*/
int
ext2fs_rename(void *v)
{
struct vop_rename_args *ap = v;
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 inode *ip, *xp, *dp;
struct ext2fs_dirtemplate dirbuf;
/* struct timespec ts; */
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("ext2fs_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:
VOP_ABORTOP(tdvp, tcnp); /* XXX, why not in NFS? */
if (tdvp == tvp)
vrele(tdvp);
else
vput(tdvp);
if (tvp)
vput(tvp);
VOP_ABORTOP(fdvp, fcnp); /* XXX, why not in NFS? */
vrele(fdvp);
vrele(fvp);
return (error);
}
/*
* Check if just deleting a link name.
*/
if (tvp && ((VTOI(tvp)->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND)) ||
(VTOI(tdvp)->i_e2fs_flags & EXT2_APPEND))) {
error = EPERM;
goto abortit;
}
if (fvp == tvp) {
if (fvp->v_type == VDIR) {
error = EINVAL;
goto abortit;
}
/* Release destination completely. */
VOP_ABORTOP(tdvp, tcnp);
vput(tdvp);
vput(tvp);
/* Delete source. */
vrele(fdvp);
vrele(fvp);
fcnp->cn_flags &= ~MODMASK;
fcnp->cn_flags |= LOCKPARENT | LOCKLEAF;
if ((fcnp->cn_flags & SAVESTART) == 0)
panic("ext2fs_rename: lost from startdir");
fcnp->cn_nameiop = DELETE;
(void) vfs_relookup(fdvp, &fvp, fcnp);
return (VOP_REMOVE(fdvp, fvp, fcnp));
}
if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0)
goto abortit;
dp = VTOI(fdvp);
ip = VTOI(fvp);
if ((nlink_t)ip->i_e2fs_nlink >= LINK_MAX) {
VOP_UNLOCK(fvp);
error = EMLINK;
goto abortit;
}
if ((ip->i_e2fs_flags & (EXT2_IMMUTABLE | EXT2_APPEND)) ||
(dp->i_e2fs_flags & EXT2_APPEND)) {
VOP_UNLOCK(fvp);
error = EPERM;
goto abortit;
}
if ((ip->i_e2fs_mode & IFMT) == IFDIR) {
error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_proc);
if (!error && tvp)
error = VOP_ACCESS(tvp, VWRITE, tcnp->cn_cred,
tcnp->cn_proc);
if (error) {
VOP_UNLOCK(fvp);
error = EACCES;
goto abortit;
}
/*
* Avoid ".", "..", and aliases of "." for obvious reasons.
*/
if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') ||
dp == ip ||
(fcnp->cn_flags&ISDOTDOT) ||
(tcnp->cn_flags & ISDOTDOT) ||
(ip->i_flag & IN_RENAME)) {
VOP_UNLOCK(fvp);
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_e2fs_nlink++;
ip->i_flag |= IN_CHANGE;
if ((error = ext2fs_update(ip, 1)) != 0) {
VOP_UNLOCK(fvp);
goto bad;
}
/*
* If ".." must be changed (ie the directory gets a new
* parent) then the source directory must not be in the
* directory hierarchy 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_proc);
VOP_UNLOCK(fvp);
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 = ext2fs_checkpath(ip, dp, tcnp->cn_cred);
if (error != 0)
goto out;
if ((tcnp->cn_flags & SAVESTART) == 0)
panic("ext2fs_rename: lost to startdir");
if ((error = vfs_relookup(tdvp, &tvp, tcnp)) != 0)
goto out;
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("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_e2fs_nlink >= LINK_MAX) {
error = EMLINK;
goto bad;
}
dp->i_e2fs_nlink++;
dp->i_flag |= IN_CHANGE;
if ((error = ext2fs_update(dp, 1)) != 0)
goto bad;
}
error = ext2fs_direnter(ip, tdvp, tcnp);
if (error != 0) {
if (doingdirectory && newparent) {
dp->i_e2fs_nlink--;
dp->i_flag |= IN_CHANGE;
(void)ext2fs_update(dp, 1);
}
goto bad;
}
vput(tdvp);
} else {
if (xp->i_dev != dp->i_dev || xp->i_dev != ip->i_dev)
panic("rename: EXDEV");
/*
* Short circuit rename(foo, foo).
*/
if (xp->i_number == ip->i_number)
panic("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_e2fs_mode & S_ISTXT) && tcnp->cn_cred->cr_uid != 0 &&
tcnp->cn_cred->cr_uid != dp->i_e2fs_uid &&
xp->i_e2fs_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_e2fs_mode & IFMT) == IFDIR) {
if (!ext2fs_dirempty(xp, dp->i_number, tcnp->cn_cred) ||
xp->i_e2fs_nlink > 2) {
error = ENOTEMPTY;
goto bad;
}
if (!doingdirectory) {
error = ENOTDIR;
goto bad;
}
cache_purge(tdvp);
} else if (doingdirectory) {
error = EISDIR;
goto bad;
}
error = ext2fs_dirrewrite(dp, ip, tcnp);
if (error != 0)
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_e2fs_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_e2fs_nlink--;
if (doingdirectory) {
if (--xp->i_e2fs_nlink != 0)
panic("rename: linked directory");
error = ext2fs_truncate(xp, (off_t)0, IO_SYNC,
tcnp->cn_cred);
}
xp->i_flag |= IN_CHANGE;
vput(tvp);
xp = NULL;
}
/*
* 3) Unlink the source.
*/
fcnp->cn_flags &= ~MODMASK;
fcnp->cn_flags |= LOCKPARENT | LOCKLEAF;
if ((fcnp->cn_flags & SAVESTART) == 0)
panic("ext2fs_rename: lost from startdir");
(void) vfs_relookup(fdvp, &fvp, fcnp);
if (fvp != NULL) {
xp = VTOI(fvp);
dp = VTOI(fdvp);
} else {
/*
* From name has disappeared.
*/
if (doingdirectory)
panic("ext2fs_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 IRENAME flag ensures that it cannot be moved by another
* rename.
*/
if (xp != ip) {
if (doingdirectory)
panic("ext2fs_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_e2fs_nlink--;
dp->i_flag |= IN_CHANGE;
error = vn_rdwr(UIO_READ, fvp, (caddr_t)&dirbuf,
sizeof (struct ext2fs_dirtemplate), (off_t)0,
UIO_SYSSPACE, IO_NODELOCKED,
tcnp->cn_cred, NULL, curproc);
if (error == 0) {
namlen = dirbuf.dotdot_namlen;
if (namlen != 2 ||
dirbuf.dotdot_name[0] != '.' ||
dirbuf.dotdot_name[1] != '.') {
ufs_dirbad(xp, (doff_t)12,
"ext2fs_rename: mangled dir");
} else {
dirbuf.dotdot_ino = htole32(newparent);
(void) vn_rdwr(UIO_WRITE, fvp,
(caddr_t)&dirbuf,
sizeof (struct dirtemplate),
(off_t)0, UIO_SYSSPACE,
IO_NODELOCKED|IO_SYNC,
tcnp->cn_cred, NULL, curproc);
cache_purge(fdvp);
}
}
}
error = ext2fs_dirremove(fdvp, fcnp);
if (!error) {
xp->i_e2fs_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) == 0) {
ip->i_e2fs_nlink--;
ip->i_flag |= IN_CHANGE;
vput(fvp);
} else
vrele(fvp);
return (error);
}
/*
* Mkdir system call
*/
int
ext2fs_mkdir(void *v)
{
struct vop_mkdir_args *ap = v;
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 ext2fs_dirtemplate dirtemplate;
mode_t dmode;
int error;
#ifdef DIAGNOSTIC
if ((cnp->cn_flags & HASBUF) == 0)
panic("ext2fs_mkdir: no name");
#endif
dp = 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_inode_alloc(dp, dmode, cnp->cn_cred, &tvp)) != 0)
goto out;
ip = VTOI(tvp);
ip->i_e2fs_uid = cnp->cn_cred->cr_uid;
ip->i_e2fs_gid = dp->i_e2fs_gid;
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;
error = ext2fs_update(ip, 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_e2fs_nlink++;
dp->i_flag |= IN_CHANGE;
if ((error = ext2fs_update(dp, 1)) != 0)
goto bad;
/* Initialize directory with "." and ".." from static template. */
memset(&dirtemplate, 0, sizeof(dirtemplate));
dirtemplate.dot_ino = htole32(ip->i_number);
dirtemplate.dot_reclen = htole16(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 = htole32(dp->i_number);
dirtemplate.dotdot_reclen = htole16(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 = vn_rdwr(UIO_WRITE, tvp, (caddr_t)&dirtemplate,
sizeof (dirtemplate), (off_t)0, UIO_SYSSPACE,
IO_NODELOCKED|IO_SYNC, cnp->cn_cred, NULL, curproc);
if (error) {
dp->i_e2fs_nlink--;
dp->i_flag |= IN_CHANGE;
goto bad;
}
if (VTOI(dvp)->i_e2fs->e2fs_bsize >
VFSTOUFS(dvp->v_mount)->um_mountp->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;
}
/* Directory set up, now install its entry in the parent directory. */
error = ext2fs_direnter(ip, dvp, cnp);
if (error != 0) {
dp->i_e2fs_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_e2fs_nlink = 0;
ip->i_flag |= IN_CHANGE;
vput(tvp);
} else
*ap->a_vpp = tvp;
out:
pool_put(&namei_pool, cnp->cn_pnbuf);
vput(dvp);
return (error);
}
/*
* Rmdir system call.
*/
int
ext2fs_rmdir(void *v)
{
struct vop_rmdir_args *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;
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_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, cnp);
if (error != 0)
goto out;
dp->i_e2fs_nlink--;
dp->i_flag |= IN_CHANGE;
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(ip, (off_t)0, IO_SYNC, cnp->cn_cred);
cache_purge(ITOV(ip));
out:
if (dvp)
vput(dvp);
vput(vp);
return (error);
}
/*
* symlink -- make a symbolic link
*/
int
ext2fs_symlink(void *v)
{
struct vop_symlink_args *ap = v;
struct vnode *vp, **vpp = ap->a_vpp;
struct inode *ip;
int len, error;
error = ext2fs_makeinode(IFLNK | ap->a_vap->va_mode, ap->a_dvp,
vpp, ap->a_cnp);
vput(ap->a_dvp);
if (error)
return (error);
vp = *vpp;
len = strlen(ap->a_target);
if (len < EXT2_MAXSYMLINKLEN) {
ip = VTOI(vp);
memcpy(ip->i_e2din->e2di_shortlink, ap->a_target, len);
error = ext2fs_setsize(ip, len);
if (error)
goto bad;
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, ap->a_cnp->cn_cred, NULL,
curproc);
bad:
vput(vp);
return (error);
}
/*
* Return target name of a symbolic link
*/
int
ext2fs_readlink(void *v)
{
struct vop_readlink_args *ap = v;
struct vnode *vp = ap->a_vp;
struct inode *ip = VTOI(vp);
u_int64_t isize;
isize = ext2fs_size(ip);
if (isize < EXT2_MAXSYMLINKLEN) {
return (uiomove((char *)ip->i_e2din->e2di_shortlink, isize,
ap->a_uio));
}
return (VOP_READ(vp, ap->a_uio, 0, ap->a_cred));
}
/*
* Return POSIX pathconf information applicable to ext2 filesystems.
*/
int
ext2fs_pathconf(void *v)
{
struct vop_pathconf_args *ap = v;
int error = 0;
switch (ap->a_name) {
case _PC_TIMESTAMP_RESOLUTION:
*ap->a_retval = 1000000000; /* 1 billion nanoseconds */
break;
default:
return (ufs_pathconf(v));
}
return (error);
}
/*
* Advisory record locking support
*/
int
ext2fs_advlock(void *v)
{
struct vop_advlock_args *ap = v;
struct inode *ip = VTOI(ap->a_vp);
return (lf_advlock(&ip->i_lockf, ext2fs_size(ip), ap->a_id, ap->a_op,
ap->a_fl, ap->a_flags));
}
/*
* Allocate a new inode.
*/
int
ext2fs_makeinode(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("ext2fs_makeinode: no name");
#endif
*vpp = NULL;
if ((mode & IFMT) == 0)
mode |= IFREG;
if ((error = ext2fs_inode_alloc(pdir, mode, cnp->cn_cred, &tvp))
!= 0) {
pool_put(&namei_pool, cnp->cn_pnbuf);
return (error);
}
ip = VTOI(tvp);
ip->i_e2fs_gid = pdir->i_e2fs_gid;
ip->i_e2fs_uid = cnp->cn_cred->cr_uid;
ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
ip->i_e2fs_mode = mode;
tvp->v_type = IFTOVT(mode); /* Rest init'd in getnewvnode(). */
ip->i_e2fs_nlink = 1;
if ((ip->i_e2fs_mode & ISGID) &&
!groupmember(ip->i_e2fs_gid, cnp->cn_cred) &&
suser_ucred(cnp->cn_cred))
ip->i_e2fs_mode &= ~ISGID;
/*
* Make sure inode goes to disk before directory entry.
*/
if ((error = ext2fs_update(ip, 1)) != 0)
goto bad;
error = ext2fs_direnter(ip, dvp, cnp);
if (error != 0)
goto bad;
if ((cnp->cn_flags & SAVESTART) == 0)
pool_put(&namei_pool, cnp->cn_pnbuf);
*vpp = tvp;
return (0);
bad:
/*
* Write error occurred trying to update the inode
* or the directory so must deallocate the inode.
*/
pool_put(&namei_pool, cnp->cn_pnbuf);
ip->i_e2fs_nlink = 0;
ip->i_flag |= IN_CHANGE;
tvp->v_type = VNON;
vput(tvp);
return (error);
}
/*
* Synch an open file.
*/
int
ext2fs_fsync(void *v)
{
struct vop_fsync_args *ap = v;
struct vnode *vp = ap->a_vp;
vflushbuf(vp, ap->a_waitfor == MNT_WAIT);
return (ext2fs_update(VTOI(ap->a_vp), ap->a_waitfor == MNT_WAIT));
}
/*
* Reclaim an inode so that it can be used for other purposes.
*/
int
ext2fs_reclaim(void *v)
{
struct vop_reclaim_args *ap = v;
struct vnode *vp = ap->a_vp;
struct inode *ip;
#ifdef DIAGNOSTIC
extern int prtactive;
if (prtactive && vp->v_usecount != 0)
vprint("ext2fs_reclaim: pushing active", vp);
#endif
/*
* Remove the inode from its hash chain.
*/
ip = VTOI(vp);
ufs_ihashrem(ip);
/*
* Purge old data structures associated with the inode.
*/
cache_purge(vp);
if (ip->i_devvp)
vrele(ip->i_devvp);
if (ip->i_e2din != NULL)
pool_put(&ext2fs_dinode_pool, ip->i_e2din);
pool_put(&ext2fs_inode_pool, ip);
vp->v_data = NULL;
return (0);
}
/* Global vfs data structures for ext2fs. */
const struct vops ext2fs_vops = {
.vop_lookup = ext2fs_lookup,
.vop_create = ext2fs_create,
.vop_mknod = ext2fs_mknod,
.vop_open = ext2fs_open,
.vop_close = ufs_close,
.vop_access = ext2fs_access,
.vop_getattr = ext2fs_getattr,
.vop_setattr = ext2fs_setattr,
.vop_read = ext2fs_read,
.vop_write = ext2fs_write,
.vop_ioctl = ufs_ioctl,
.vop_kqfilter = ufs_kqfilter,
.vop_revoke = NULL,
.vop_fsync = ext2fs_fsync,
.vop_remove = ext2fs_remove,
.vop_link = ext2fs_link,
.vop_rename = ext2fs_rename,
.vop_mkdir = ext2fs_mkdir,
.vop_rmdir = ext2fs_rmdir,
.vop_symlink = ext2fs_symlink,
.vop_readdir = ext2fs_readdir,
.vop_readlink = ext2fs_readlink,
.vop_abortop = vop_generic_abortop,
.vop_inactive = ext2fs_inactive,
.vop_reclaim = ext2fs_reclaim,
.vop_lock = ufs_lock,
.vop_unlock = ufs_unlock,
.vop_bmap = ext2fs_bmap,
.vop_strategy = ufs_strategy,
.vop_print = ufs_print,
.vop_islocked = ufs_islocked,
.vop_pathconf = ext2fs_pathconf,
.vop_advlock = ext2fs_advlock,
.vop_bwrite = vop_generic_bwrite,
};
const struct vops ext2fs_specvops = {
.vop_close = ufsspec_close,
.vop_access = ext2fs_access,
.vop_getattr = ext2fs_getattr,
.vop_setattr = ext2fs_setattr,
.vop_read = ufsspec_read,
.vop_write = ufsspec_write,
.vop_fsync = ext2fs_fsync,
.vop_inactive = ext2fs_inactive,
.vop_reclaim = ext2fs_reclaim,
.vop_lock = ufs_lock,
.vop_unlock = ufs_unlock,
.vop_print = ufs_print,
.vop_islocked = ufs_islocked,
/* XXX: Keep in sync with spec_vops. */
.vop_lookup = vop_generic_lookup,
.vop_create = vop_generic_badop,
.vop_mknod = vop_generic_badop,
.vop_open = spec_open,
.vop_ioctl = spec_ioctl,
.vop_kqfilter = spec_kqfilter,
.vop_revoke = vop_generic_revoke,
.vop_remove = vop_generic_badop,
.vop_link = vop_generic_badop,
.vop_rename = vop_generic_badop,
.vop_mkdir = vop_generic_badop,
.vop_rmdir = vop_generic_badop,
.vop_symlink = vop_generic_badop,
.vop_readdir = vop_generic_badop,
.vop_readlink = vop_generic_badop,
.vop_abortop = vop_generic_badop,
.vop_bmap = vop_generic_bmap,
.vop_strategy = spec_strategy,
.vop_pathconf = spec_pathconf,
.vop_advlock = spec_advlock,
.vop_bwrite = vop_generic_bwrite,
};
#ifdef FIFO
const struct vops ext2fs_fifovops = {
.vop_close = ufsfifo_close,
.vop_access = ufsfifo_close,
.vop_getattr = ext2fs_getattr,
.vop_setattr = ext2fs_setattr,
.vop_read = ufsfifo_read,
.vop_write = ufsfifo_write,
.vop_fsync = ext2fs_fsync,
.vop_inactive = ext2fs_inactive,
.vop_reclaim = ext2fsfifo_reclaim,
.vop_lock = ufs_lock,
.vop_unlock = ufs_unlock,
.vop_print = ufs_print,
.vop_islocked = ufs_islocked,
.vop_bwrite = vop_generic_bwrite,
/* XXX: Keep in sync with fifo_vops */
.vop_lookup = vop_generic_lookup,
.vop_create = vop_generic_badop,
.vop_mknod = vop_generic_badop,
.vop_open = fifo_open,
.vop_ioctl = fifo_ioctl,
.vop_kqfilter = fifo_kqfilter,
.vop_revoke = vop_generic_revoke,
.vop_remove = vop_generic_badop,
.vop_link = vop_generic_badop,
.vop_rename = vop_generic_badop,
.vop_mkdir = vop_generic_badop,
.vop_rmdir = vop_generic_badop,
.vop_symlink = vop_generic_badop,
.vop_readdir = vop_generic_badop,
.vop_readlink = vop_generic_badop,
.vop_abortop = vop_generic_badop,
.vop_bmap = vop_generic_bmap,
.vop_strategy = vop_generic_badop,
.vop_pathconf = fifo_pathconf,
.vop_advlock = fifo_advlock,
};
int
ext2fsfifo_reclaim(void *v)
{
fifo_reclaim(v);
return (ext2fs_reclaim(v));
}
#endif /* FIFO */
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