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freebsd-skq/sys/ufs/ufs/ufs_vnops.c
trasz baac623cd9 Remove unused thread argument from vtruncbuf(). 
Reviewed by:	kib
2012-04-23 13:21:28 +00:00

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/*-
* Copyright (c) 1982, 1986, 1989, 1993, 1995
* 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.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)ufs_vnops.c 8.27 (Berkeley) 5/27/95
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_quota.h"
#include "opt_suiddir.h"
#include "opt_ufs.h"
#include "opt_ffs.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/namei.h>
#include <sys/kernel.h>
#include <sys/fcntl.h>
#include <sys/stat.h>
#include <sys/bio.h>
#include <sys/buf.h>
#include <sys/mount.h>
#include <sys/priv.h>
#include <sys/refcount.h>
#include <sys/unistd.h>
#include <sys/vnode.h>
#include <sys/dirent.h>
#include <sys/lockf.h>
#include <sys/conf.h>
#include <sys/acl.h>
#include <security/mac/mac_framework.h>
#include <sys/file.h> /* XXX */
#include <vm/vm.h>
#include <vm/vm_extern.h>
#include <ufs/ufs/acl.h>
#include <ufs/ufs/extattr.h>
#include <ufs/ufs/quota.h>
#include <ufs/ufs/inode.h>
#include <ufs/ufs/dir.h>
#include <ufs/ufs/ufsmount.h>
#include <ufs/ufs/ufs_extern.h>
#ifdef UFS_DIRHASH
#include <ufs/ufs/dirhash.h>
#endif
#ifdef UFS_GJOURNAL
#include <ufs/ufs/gjournal.h>
FEATURE(ufs_gjournal, "Journaling support through GEOM for UFS");
#endif
#ifdef QUOTA
FEATURE(ufs_quota, "UFS disk quotas support");
FEATURE(ufs_quota64, "64bit UFS disk quotas support");
#endif
#ifdef SUIDDIR
FEATURE(suiddir,
"Give all new files in directory the same ownership as the directory");
#endif
#include <ufs/ffs/ffs_extern.h>
static vop_accessx_t ufs_accessx;
static int ufs_chmod(struct vnode *, int, struct ucred *, struct thread *);
static int ufs_chown(struct vnode *, uid_t, gid_t, struct ucred *, struct thread *);
static vop_close_t ufs_close;
static vop_create_t ufs_create;
static vop_getattr_t ufs_getattr;
static vop_link_t ufs_link;
static int ufs_makeinode(int mode, struct vnode *, struct vnode **, struct componentname *);
static vop_markatime_t ufs_markatime;
static vop_mkdir_t ufs_mkdir;
static vop_mknod_t ufs_mknod;
static vop_open_t ufs_open;
static vop_pathconf_t ufs_pathconf;
static vop_print_t ufs_print;
static vop_readlink_t ufs_readlink;
static vop_remove_t ufs_remove;
static vop_rename_t ufs_rename;
static vop_rmdir_t ufs_rmdir;
static vop_setattr_t ufs_setattr;
static vop_strategy_t ufs_strategy;
static vop_symlink_t ufs_symlink;
static vop_whiteout_t ufs_whiteout;
static vop_close_t ufsfifo_close;
static vop_kqfilter_t ufsfifo_kqfilter;
static vop_pathconf_t ufsfifo_pathconf;
SYSCTL_NODE(_vfs, OID_AUTO, ufs, CTLFLAG_RD, 0, "UFS filesystem");
/*
* A virgin directory (no blushing please).
*/
static struct dirtemplate mastertemplate = {
0, 12, DT_DIR, 1, ".",
0, DIRBLKSIZ - 12, DT_DIR, 2, ".."
};
static struct odirtemplate omastertemplate = {
0, 12, 1, ".",
0, DIRBLKSIZ - 12, 2, ".."
};
static void
ufs_itimes_locked(struct vnode *vp)
{
struct inode *ip;
struct timespec ts;
ASSERT_VI_LOCKED(vp, __func__);
ip = VTOI(vp);
if (UFS_RDONLY(ip))
goto out;
if ((ip->i_flag & (IN_ACCESS | IN_CHANGE | IN_UPDATE)) == 0)
return;
if ((vp->v_type == VBLK || vp->v_type == VCHR) && !DOINGSOFTDEP(vp))
ip->i_flag |= IN_LAZYMOD;
else if (((vp->v_mount->mnt_kern_flag &
(MNTK_SUSPENDED | MNTK_SUSPEND)) == 0) ||
(ip->i_flag & (IN_CHANGE | IN_UPDATE)))
ip->i_flag |= IN_MODIFIED;
else if (ip->i_flag & IN_ACCESS)
ip->i_flag |= IN_LAZYACCESS;
vfs_timestamp(&ts);
if (ip->i_flag & IN_ACCESS) {
DIP_SET(ip, i_atime, ts.tv_sec);
DIP_SET(ip, i_atimensec, ts.tv_nsec);
}
if (ip->i_flag & IN_UPDATE) {
DIP_SET(ip, i_mtime, ts.tv_sec);
DIP_SET(ip, i_mtimensec, ts.tv_nsec);
}
if (ip->i_flag & IN_CHANGE) {
DIP_SET(ip, i_ctime, ts.tv_sec);
DIP_SET(ip, i_ctimensec, ts.tv_nsec);
DIP_SET(ip, i_modrev, DIP(ip, i_modrev) + 1);
}
out:
ip->i_flag &= ~(IN_ACCESS | IN_CHANGE | IN_UPDATE);
}
void
ufs_itimes(struct vnode *vp)
{
VI_LOCK(vp);
ufs_itimes_locked(vp);
VI_UNLOCK(vp);
}
/*
* Create a regular file
*/
static int
ufs_create(ap)
struct vop_create_args /* {
struct vnode *a_dvp;
struct vnode **a_vpp;
struct componentname *a_cnp;
struct vattr *a_vap;
} */ *ap;
{
int error;
error =
ufs_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);
return (0);
}
/*
* Mknod vnode call
*/
/* ARGSUSED */
static int
ufs_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 = ufs_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.
*/
DIP_SET(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. XXX I don't believe this is necessary now.
*/
(*vpp)->v_type = VNON;
ino = ip->i_number; /* Save this before vgone() invalidates ip. */
vgone(*vpp);
vput(*vpp);
error = VFS_VGET(ap->a_dvp->v_mount, ino, LK_EXCLUSIVE, vpp);
if (error) {
*vpp = NULL;
return (error);
}
return (0);
}
/*
* Open called.
*/
/* ARGSUSED */
static int
ufs_open(struct vop_open_args *ap)
{
struct vnode *vp = ap->a_vp;
struct inode *ip;
if (vp->v_type == VCHR || vp->v_type == VBLK)
return (EOPNOTSUPP);
ip = VTOI(vp);
/*
* Files marked append-only must be opened for appending.
*/
if ((ip->i_flags & APPEND) &&
(ap->a_mode & (FWRITE | O_APPEND)) == FWRITE)
return (EPERM);
vnode_create_vobject(vp, DIP(ip, i_size), ap->a_td);
return (0);
}
/*
* Close called.
*
* Update the times on the inode.
*/
/* ARGSUSED */
static int
ufs_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;
int usecount;
VI_LOCK(vp);
usecount = vp->v_usecount;
if (usecount > 1)
ufs_itimes_locked(vp);
VI_UNLOCK(vp);
return (0);
}
static int
ufs_accessx(ap)
struct vop_accessx_args /* {
struct vnode *a_vp;
accmode_t a_accmode;
struct ucred *a_cred;
struct thread *a_td;
} */ *ap;
{
struct vnode *vp = ap->a_vp;
struct inode *ip = VTOI(vp);
accmode_t accmode = ap->a_accmode;
int error;
#ifdef QUOTA
int relocked;
#endif
#ifdef UFS_ACL
struct acl *acl;
acl_type_t type;
#endif
/*
* Disallow write attempts on read-only filesystems;
* unless the file is a socket, fifo, or a block or
* character device resident on the filesystem.
*/
if (accmode & VMODIFY_PERMS) {
switch (vp->v_type) {
case VDIR:
case VLNK:
case VREG:
if (vp->v_mount->mnt_flag & MNT_RDONLY)
return (EROFS);
#ifdef QUOTA
/*
* Inode is accounted in the quotas only if struct
* dquot is attached to it. VOP_ACCESS() is called
* from vn_open_cred() and provides a convenient
* point to call getinoquota().
*/
if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) {
/*
* Upgrade vnode lock, since getinoquota()
* requires exclusive lock to modify inode.
*/
relocked = 1;
vhold(vp);
vn_lock(vp, LK_UPGRADE | LK_RETRY);
VI_LOCK(vp);
if (vp->v_iflag & VI_DOOMED) {
vdropl(vp);
error = ENOENT;
goto relock;
}
vdropl(vp);
} else
relocked = 0;
error = getinoquota(ip);
relock:
if (relocked)
vn_lock(vp, LK_DOWNGRADE | LK_RETRY);
if (error != 0)
return (error);
#endif
break;
default:
break;
}
}
/*
* If immutable bit set, nobody gets to write it. "& ~VADMIN_PERMS"
* is here, because without it, * it would be impossible for the owner
* to remove the IMMUTABLE flag.
*/
if ((accmode & (VMODIFY_PERMS & ~VADMIN_PERMS)) &&
(ip->i_flags & (IMMUTABLE | SF_SNAPSHOT)))
return (EPERM);
#ifdef UFS_ACL
if ((vp->v_mount->mnt_flag & (MNT_ACLS | MNT_NFS4ACLS)) != 0) {
if (vp->v_mount->mnt_flag & MNT_NFS4ACLS)
type = ACL_TYPE_NFS4;
else
type = ACL_TYPE_ACCESS;
acl = acl_alloc(M_WAITOK);
if (type == ACL_TYPE_NFS4)
error = ufs_getacl_nfs4_internal(vp, acl, ap->a_td);
else
error = VOP_GETACL(vp, type, acl, ap->a_cred, ap->a_td);
switch (error) {
case 0:
if (type == ACL_TYPE_NFS4) {
error = vaccess_acl_nfs4(vp->v_type, ip->i_uid,
ip->i_gid, acl, accmode, ap->a_cred, NULL);
} else {
error = vfs_unixify_accmode(&accmode);
if (error == 0)
error = vaccess_acl_posix1e(vp->v_type, ip->i_uid,
ip->i_gid, acl, accmode, ap->a_cred, NULL);
}
break;
default:
if (error != EOPNOTSUPP)
printf(
"ufs_accessx(): Error retrieving ACL on object (%d).\n",
error);
/*
* XXX: Fall back until debugged. Should
* eventually possibly log an error, and return
* EPERM for safety.
*/
error = vfs_unixify_accmode(&accmode);
if (error == 0)
error = vaccess(vp->v_type, ip->i_mode, ip->i_uid,
ip->i_gid, accmode, ap->a_cred, NULL);
}
acl_free(acl);
return (error);
}
#endif /* !UFS_ACL */
error = vfs_unixify_accmode(&accmode);
if (error == 0)
error = vaccess(vp->v_type, ip->i_mode, ip->i_uid, ip->i_gid,
accmode, ap->a_cred, NULL);
return (error);
}
/* ARGSUSED */
static int
ufs_getattr(ap)
struct vop_getattr_args /* {
struct vnode *a_vp;
struct vattr *a_vap;
struct ucred *a_cred;
} */ *ap;
{
struct vnode *vp = ap->a_vp;
struct inode *ip = VTOI(vp);
struct vattr *vap = ap->a_vap;
VI_LOCK(vp);
ufs_itimes_locked(vp);
if (ip->i_ump->um_fstype == UFS1) {
vap->va_atime.tv_sec = ip->i_din1->di_atime;
vap->va_atime.tv_nsec = ip->i_din1->di_atimensec;
} else {
vap->va_atime.tv_sec = ip->i_din2->di_atime;
vap->va_atime.tv_nsec = ip->i_din2->di_atimensec;
}
VI_UNLOCK(vp);
/*
* Copy from inode table
*/
vap->va_fsid = dev2udev(ip->i_dev);
vap->va_fileid = ip->i_number;
vap->va_mode = ip->i_mode & ~IFMT;
vap->va_nlink = ip->i_effnlink;
vap->va_uid = ip->i_uid;
vap->va_gid = ip->i_gid;
if (ip->i_ump->um_fstype == UFS1) {
vap->va_rdev = ip->i_din1->di_rdev;
vap->va_size = ip->i_din1->di_size;
vap->va_mtime.tv_sec = ip->i_din1->di_mtime;
vap->va_mtime.tv_nsec = ip->i_din1->di_mtimensec;
vap->va_ctime.tv_sec = ip->i_din1->di_ctime;
vap->va_ctime.tv_nsec = ip->i_din1->di_ctimensec;
vap->va_bytes = dbtob((u_quad_t)ip->i_din1->di_blocks);
vap->va_filerev = ip->i_din1->di_modrev;
} else {
vap->va_rdev = ip->i_din2->di_rdev;
vap->va_size = ip->i_din2->di_size;
vap->va_mtime.tv_sec = ip->i_din2->di_mtime;
vap->va_mtime.tv_nsec = ip->i_din2->di_mtimensec;
vap->va_ctime.tv_sec = ip->i_din2->di_ctime;
vap->va_ctime.tv_nsec = ip->i_din2->di_ctimensec;
vap->va_birthtime.tv_sec = ip->i_din2->di_birthtime;
vap->va_birthtime.tv_nsec = ip->i_din2->di_birthnsec;
vap->va_bytes = dbtob((u_quad_t)ip->i_din2->di_blocks);
vap->va_filerev = ip->i_din2->di_modrev;
}
vap->va_flags = ip->i_flags;
vap->va_gen = ip->i_gen;
vap->va_blocksize = vp->v_mount->mnt_stat.f_iosize;
vap->va_type = IFTOVT(ip->i_mode);
return (0);
}
/*
* Set attribute vnode op. called from several syscalls
*/
static int
ufs_setattr(ap)
struct vop_setattr_args /* {
struct vnode *a_vp;
struct vattr *a_vap;
struct ucred *a_cred;
} */ *ap;
{
struct vattr *vap = ap->a_vap;
struct vnode *vp = ap->a_vp;
struct inode *ip = VTOI(vp);
struct ucred *cred = ap->a_cred;
struct thread *td = curthread;
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 ((vap->va_flags & ~(UF_NODUMP | UF_IMMUTABLE | UF_APPEND |
UF_OPAQUE | UF_NOUNLINK | SF_ARCHIVED | SF_IMMUTABLE |
SF_APPEND | SF_NOUNLINK | SF_SNAPSHOT)) != 0)
return (EOPNOTSUPP);
if (vp->v_mount->mnt_flag & MNT_RDONLY)
return (EROFS);
/*
* Callers may only modify the file flags on objects they
* have VADMIN rights for.
*/
if ((error = VOP_ACCESS(vp, VADMIN, cred, td)))
return (error);
/*
* Unprivileged processes 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.
* Privileged jail processes behave like privileged non-jail
* processes if the security.jail.chflags_allowed sysctl is
* is non-zero; otherwise, they behave like unprivileged
* processes.
*/
if (!priv_check_cred(cred, PRIV_VFS_SYSFLAGS, 0)) {
if (ip->i_flags &
(SF_NOUNLINK | SF_IMMUTABLE | SF_APPEND)) {
error = securelevel_gt(cred, 0);
if (error)
return (error);
}
/* The snapshot flag cannot be toggled. */
if ((vap->va_flags ^ ip->i_flags) & SF_SNAPSHOT)
return (EPERM);
} else {
if (ip->i_flags &
(SF_NOUNLINK | SF_IMMUTABLE | SF_APPEND) ||
((vap->va_flags ^ ip->i_flags) & SF_SETTABLE))
return (EPERM);
}
ip->i_flags = vap->va_flags;
DIP_SET(ip, i_flags, vap->va_flags);
ip->i_flag |= IN_CHANGE;
error = UFS_UPDATE(vp, 0);
if (ip->i_flags & (IMMUTABLE | APPEND))
return (error);
}
/*
* If immutable or append, no one can change any of its attributes
* except the ones already handled (in some cases, file flags
* including the immutability flags themselves for the superuser).
*/
if (ip->i_flags & (IMMUTABLE | APPEND))
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 = ufs_chown(vp, vap->va_uid, vap->va_gid, cred,
td)) != 0)
return (error);
}
if (vap->va_size != VNOVAL) {
/*
* XXX most of the following special cases should be in
* callers instead of in N filesystems. The VDIR check
* mostly already is.
*/
switch (vp->v_type) {
case VDIR:
return (EISDIR);
case VLNK:
case VREG:
/*
* Truncation should have an effect in these cases.
* Disallow it if the filesystem is read-only or
* the file is being snapshotted.
*/
if (vp->v_mount->mnt_flag & MNT_RDONLY)
return (EROFS);
if ((ip->i_flags & SF_SNAPSHOT) != 0)
return (EPERM);
break;
default:
/*
* According to POSIX, the result is unspecified
* for file types other than regular files,
* directories and shared memory objects. We
* don't support shared memory objects in the file
* system, and have dubious support for truncating
* symlinks. Just ignore the request in other cases.
*/
return (0);
}
if ((error = UFS_TRUNCATE(vp, vap->va_size, IO_NORMAL,
cred)) != 0)
return (error);
}
if (vap->va_atime.tv_sec != VNOVAL ||
vap->va_mtime.tv_sec != VNOVAL ||
vap->va_birthtime.tv_sec != VNOVAL) {
if (vp->v_mount->mnt_flag & MNT_RDONLY)
return (EROFS);
if ((ip->i_flags & SF_SNAPSHOT) != 0)
return (EPERM);
/*
* 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.
*
* Possibly for historical reasons, try to use VADMIN in
* preference to VWRITE for a NULL timestamp. This means we
* will return EACCES in preference to EPERM if neither
* check succeeds.
*/
if (vap->va_vaflags & VA_UTIMES_NULL) {
/*
* NFSv4.1, draft 21, 6.2.1.3.1, Discussion of Mask Attributes
*
* "A user having ACL_WRITE_DATA or ACL_WRITE_ATTRIBUTES
* will be allowed to set the times [..] to the current
* server time."
*
* XXX: Calling it four times seems a little excessive.
*/
error = VOP_ACCESSX(vp, VWRITE_ATTRIBUTES, cred, td);
if (error)
error = VOP_ACCESS(vp, VWRITE, cred, td);
} else
error = VOP_ACCESSX(vp, VWRITE_ATTRIBUTES, cred, td);
if (error)
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;
if (vap->va_birthtime.tv_sec != VNOVAL &&
ip->i_ump->um_fstype == UFS2)
ip->i_flag |= IN_MODIFIED;
ufs_itimes(vp);
if (vap->va_atime.tv_sec != VNOVAL) {
DIP_SET(ip, i_atime, vap->va_atime.tv_sec);
DIP_SET(ip, i_atimensec, vap->va_atime.tv_nsec);
}
if (vap->va_mtime.tv_sec != VNOVAL) {
DIP_SET(ip, i_mtime, vap->va_mtime.tv_sec);
DIP_SET(ip, i_mtimensec, vap->va_mtime.tv_nsec);
}
if (vap->va_birthtime.tv_sec != VNOVAL &&
ip->i_ump->um_fstype == UFS2) {
ip->i_din2->di_birthtime = vap->va_birthtime.tv_sec;
ip->i_din2->di_birthnsec = vap->va_birthtime.tv_nsec;
}
error = UFS_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);
if ((ip->i_flags & SF_SNAPSHOT) != 0 && (vap->va_mode &
(S_IXUSR | S_IWUSR | S_IXGRP | S_IWGRP | S_IXOTH | S_IWOTH)))
return (EPERM);
error = ufs_chmod(vp, (int)vap->va_mode, cred, td);
}
return (error);
}
#ifdef UFS_ACL
static int
ufs_update_nfs4_acl_after_mode_change(struct vnode *vp, int mode,
int file_owner_id, struct ucred *cred, struct thread *td)
{
int error;
struct acl *aclp;
aclp = acl_alloc(M_WAITOK);
error = ufs_getacl_nfs4_internal(vp, aclp, td);
/*
* We don't have to handle EOPNOTSUPP here, as the filesystem claims
* it supports ACLs.
*/
if (error)
goto out;
acl_nfs4_sync_acl_from_mode(aclp, mode, file_owner_id);
error = ufs_setacl_nfs4_internal(vp, aclp, td);
out:
acl_free(aclp);
return (error);
}
#endif /* UFS_ACL */
/*
* Mark this file's access time for update for vfs_mark_atime(). This
* is called from execve() and mmap().
*/
static int
ufs_markatime(ap)
struct vop_markatime_args /* {
struct vnode *a_vp;
} */ *ap;
{
struct vnode *vp = ap->a_vp;
struct inode *ip = VTOI(vp);
VI_LOCK(vp);
ip->i_flag |= IN_ACCESS;
VI_UNLOCK(vp);
/*
* XXXKIB No UFS_UPDATE(ap->a_vp, 0) there.
*/
return (0);
}
/*
* Change the mode on a file.
* Inode must be locked before calling.
*/
static int
ufs_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_ACCESSX(vp, VWRITE_ACL, 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. Both of these are allowed in
* jail(8).
*/
if (vp->v_type != VDIR && (mode & S_ISTXT)) {
if (priv_check_cred(cred, PRIV_VFS_STICKYFILE, 0))
return (EFTYPE);
}
if (!groupmember(ip->i_gid, cred) && (mode & ISGID)) {
error = priv_check_cred(cred, PRIV_VFS_SETGID, 0);
if (error)
return (error);
}
/*
* Deny setting setuid if we are not the file owner.
*/
if ((mode & ISUID) && ip->i_uid != cred->cr_uid) {
error = priv_check_cred(cred, PRIV_VFS_ADMIN, 0);
if (error)
return (error);
}
ip->i_mode &= ~ALLPERMS;
ip->i_mode |= (mode & ALLPERMS);
DIP_SET(ip, i_mode, ip->i_mode);
ip->i_flag |= IN_CHANGE;
#ifdef UFS_ACL
if ((vp->v_mount->mnt_flag & MNT_NFS4ACLS) != 0)
error = ufs_update_nfs4_acl_after_mode_change(vp, mode, ip->i_uid, cred, td);
#endif
if (error == 0 && (ip->i_flag & IN_CHANGE) != 0)
error = UFS_UPDATE(vp, 0);
return (error);
}
/*
* Perform chown operation on inode ip;
* inode must be locked prior to call.
*/
static int
ufs_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;
#ifdef QUOTA
int i;
ufs2_daddr_t change;
#endif
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_ACCESSX(vp, VWRITE_OWNER, 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 && uid != cred->cr_uid) ||
(gid != ip->i_gid && !groupmember(gid, cred))) &&
(error = priv_check_cred(cred, PRIV_VFS_CHOWN, 0)))
return (error);
ogid = ip->i_gid;
ouid = ip->i_uid;
#ifdef QUOTA
if ((error = getinoquota(ip)) != 0)
return (error);
if (ouid == uid) {
dqrele(vp, ip->i_dquot[USRQUOTA]);
ip->i_dquot[USRQUOTA] = NODQUOT;
}
if (ogid == gid) {
dqrele(vp, ip->i_dquot[GRPQUOTA]);
ip->i_dquot[GRPQUOTA] = NODQUOT;
}
change = DIP(ip, i_blocks);
(void) chkdq(ip, -change, cred, CHOWN);
(void) chkiq(ip, -1, cred, CHOWN);
for (i = 0; i < MAXQUOTAS; i++) {
dqrele(vp, ip->i_dquot[i]);
ip->i_dquot[i] = NODQUOT;
}
#endif
ip->i_gid = gid;
DIP_SET(ip, i_gid, gid);
ip->i_uid = uid;
DIP_SET(ip, i_uid, uid);
#ifdef QUOTA
if ((error = getinoquota(ip)) == 0) {
if (ouid == uid) {
dqrele(vp, ip->i_dquot[USRQUOTA]);
ip->i_dquot[USRQUOTA] = NODQUOT;
}
if (ogid == gid) {
dqrele(vp, ip->i_dquot[GRPQUOTA]);
ip->i_dquot[GRPQUOTA] = NODQUOT;
}
if ((error = chkdq(ip, change, cred, CHOWN)) == 0) {
if ((error = chkiq(ip, 1, cred, CHOWN)) == 0)
goto good;
else
(void) chkdq(ip, -change, cred, CHOWN|FORCE);
}
for (i = 0; i < MAXQUOTAS; i++) {
dqrele(vp, ip->i_dquot[i]);
ip->i_dquot[i] = NODQUOT;
}
}
ip->i_gid = ogid;
DIP_SET(ip, i_gid, ogid);
ip->i_uid = ouid;
DIP_SET(ip, i_uid, ouid);
if (getinoquota(ip) == 0) {
if (ouid == uid) {
dqrele(vp, ip->i_dquot[USRQUOTA]);
ip->i_dquot[USRQUOTA] = NODQUOT;
}
if (ogid == gid) {
dqrele(vp, ip->i_dquot[GRPQUOTA]);
ip->i_dquot[GRPQUOTA] = NODQUOT;
}
(void) chkdq(ip, change, cred, FORCE|CHOWN);
(void) chkiq(ip, 1, cred, FORCE|CHOWN);
(void) getinoquota(ip);
}
return (error);
good:
if (getinoquota(ip))
panic("ufs_chown: lost quota");
#endif /* QUOTA */
ip->i_flag |= IN_CHANGE;
if ((ip->i_mode & (ISUID | ISGID)) && (ouid != uid || ogid != gid)) {
if (priv_check_cred(cred, PRIV_VFS_RETAINSUGID, 0)) {
ip->i_mode &= ~(ISUID | ISGID);
DIP_SET(ip, i_mode, ip->i_mode);
}
}
error = UFS_UPDATE(vp, 0);
return (error);
}
static int
ufs_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;
struct thread *td;
td = curthread;
ip = VTOI(vp);
if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
(VTOI(dvp)->i_flags & APPEND)) {
error = EPERM;
goto out;
}
#ifdef UFS_GJOURNAL
ufs_gjournal_orphan(vp);
#endif
error = ufs_dirremove(dvp, ip, ap->a_cnp->cn_flags, 0);
if (ip->i_nlink <= 0)
vp->v_vflag |= VV_NOSYNC;
if ((ip->i_flags & SF_SNAPSHOT) != 0) {
/*
* Avoid deadlock where another thread is trying to
* update the inodeblock for dvp and is waiting on
* snaplk. Temporary unlock the vnode lock for the
* unlinked file and sync the directory. This should
* allow vput() of the directory to not block later on
* while holding the snapshot vnode locked, assuming
* that the directory hasn't been unlinked too.
*/
VOP_UNLOCK(vp, 0);
(void) VOP_FSYNC(dvp, MNT_WAIT, td);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
}
out:
return (error);
}
/*
* link vnode call
*/
static int
ufs_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;
struct direct newdir;
int error;
#ifdef INVARIANTS
if ((cnp->cn_flags & HASBUF) == 0)
panic("ufs_link: no name");
#endif
if (tdvp->v_mount != vp->v_mount) {
error = EXDEV;
goto out;
}
if (VTOI(tdvp)->i_effnlink < 2)
panic("ufs_link: Bad link count %d on parent",
VTOI(tdvp)->i_effnlink);
ip = VTOI(vp);
if ((nlink_t)ip->i_nlink >= LINK_MAX) {
error = EMLINK;
goto out;
}
/*
* The file may have been removed after namei droped the original
* lock.
*/
if (ip->i_effnlink == 0) {
error = ENOENT;
goto out;
}
if (ip->i_flags & (IMMUTABLE | APPEND)) {
error = EPERM;
goto out;
}
ip->i_effnlink++;
ip->i_nlink++;
DIP_SET(ip, i_nlink, ip->i_nlink);
ip->i_flag |= IN_CHANGE;
if (DOINGSOFTDEP(vp))
softdep_setup_link(VTOI(tdvp), ip);
error = UFS_UPDATE(vp, !(DOINGSOFTDEP(vp) | DOINGASYNC(vp)));
if (!error) {
ufs_makedirentry(ip, cnp, &newdir);
error = ufs_direnter(tdvp, vp, &newdir, cnp, NULL, 0);
}
if (error) {
ip->i_effnlink--;
ip->i_nlink--;
DIP_SET(ip, i_nlink, ip->i_nlink);
ip->i_flag |= IN_CHANGE;
if (DOINGSOFTDEP(vp))
softdep_revert_link(VTOI(tdvp), ip);
}
out:
return (error);
}
/*
* whiteout vnode call
*/
static int
ufs_whiteout(ap)
struct vop_whiteout_args /* {
struct vnode *a_dvp;
struct componentname *a_cnp;
int a_flags;
} */ *ap;
{
struct vnode *dvp = ap->a_dvp;
struct componentname *cnp = ap->a_cnp;
struct direct newdir;
int error = 0;
switch (ap->a_flags) {
case LOOKUP:
/* 4.4 format directories support whiteout operations */
if (dvp->v_mount->mnt_maxsymlinklen > 0)
return (0);
return (EOPNOTSUPP);
case CREATE:
/* create a new directory whiteout */
#ifdef INVARIANTS
if ((cnp->cn_flags & SAVENAME) == 0)
panic("ufs_whiteout: missing name");
if (dvp->v_mount->mnt_maxsymlinklen <= 0)
panic("ufs_whiteout: old format filesystem");
#endif
newdir.d_ino = WINO;
newdir.d_namlen = cnp->cn_namelen;
bcopy(cnp->cn_nameptr, newdir.d_name, (unsigned)cnp->cn_namelen + 1);
newdir.d_type = DT_WHT;
error = ufs_direnter(dvp, NULL, &newdir, cnp, NULL, 0);
break;
case DELETE:
/* remove an existing directory whiteout */
#ifdef INVARIANTS
if (dvp->v_mount->mnt_maxsymlinklen <= 0)
panic("ufs_whiteout: old format filesystem");
#endif
cnp->cn_flags &= ~DOWHITEOUT;
error = ufs_dirremove(dvp, NULL, cnp->cn_flags, 0);
break;
default:
panic("ufs_whiteout: unknown op");
}
return (error);
}
static volatile int rename_restarts;
SYSCTL_INT(_vfs_ufs, OID_AUTO, rename_restarts, CTLFLAG_RD,
__DEVOLATILE(int *, &rename_restarts), 0,
"Times rename had to restart due to lock contention");
/*
* 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.
*/
static int
ufs_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 vnode *nvp;
struct componentname *tcnp = ap->a_tcnp;
struct componentname *fcnp = ap->a_fcnp;
struct thread *td = fcnp->cn_thread;
struct inode *fip, *tip, *tdp, *fdp;
struct direct newdir;
off_t endoff;
int doingdirectory, newparent;
int error = 0;
struct mount *mp;
ino_t ino;
#ifdef INVARIANTS
if ((tcnp->cn_flags & HASBUF) == 0 ||
(fcnp->cn_flags & HASBUF) == 0)
panic("ufs_rename: no name");
#endif
endoff = 0;
mp = tdvp->v_mount;
VOP_UNLOCK(tdvp, 0);
if (tvp && tvp != tdvp)
VOP_UNLOCK(tvp, 0);
/*
* Check for cross-device rename.
*/
if ((fvp->v_mount != tdvp->v_mount) ||
(tvp && (fvp->v_mount != tvp->v_mount))) {
error = EXDEV;
mp = NULL;
goto releout;
}
error = vfs_busy(mp, 0);
if (error) {
mp = NULL;
goto releout;
}
relock:
/*
* We need to acquire 2 to 4 locks depending on whether tvp is NULL
* and fdvp and tdvp are the same directory. Subsequently we need
* to double-check all paths and in the directory rename case we
* need to verify that we are not creating a directory loop. To
* handle this we acquire all but fdvp using non-blocking
* acquisitions. If we fail to acquire any lock in the path we will
* drop all held locks, acquire the new lock in a blocking fashion,
* and then release it and restart the rename. This acquire/release
* step ensures that we do not spin on a lock waiting for release.
*/
error = vn_lock(fdvp, LK_EXCLUSIVE);
if (error)
goto releout;
if (vn_lock(tdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) {
VOP_UNLOCK(fdvp, 0);
error = vn_lock(tdvp, LK_EXCLUSIVE);
if (error)
goto releout;
VOP_UNLOCK(tdvp, 0);
atomic_add_int(&rename_restarts, 1);
goto relock;
}
/*
* Re-resolve fvp to be certain it still exists and fetch the
* correct vnode.
*/
error = ufs_lookup_ino(fdvp, NULL, fcnp, &ino);
if (error) {
VOP_UNLOCK(fdvp, 0);
VOP_UNLOCK(tdvp, 0);
goto releout;
}
error = VFS_VGET(mp, ino, LK_EXCLUSIVE | LK_NOWAIT, &nvp);
if (error) {
VOP_UNLOCK(fdvp, 0);
VOP_UNLOCK(tdvp, 0);
if (error != EBUSY)
goto releout;
error = VFS_VGET(mp, ino, LK_EXCLUSIVE, &nvp);
if (error != 0)
goto releout;
VOP_UNLOCK(nvp, 0);
vrele(fvp);
fvp = nvp;
atomic_add_int(&rename_restarts, 1);
goto relock;
}
vrele(fvp);
fvp = nvp;
/*
* Re-resolve tvp and acquire the vnode lock if present.
*/
error = ufs_lookup_ino(tdvp, NULL, tcnp, &ino);
if (error != 0 && error != EJUSTRETURN) {
VOP_UNLOCK(fdvp, 0);
VOP_UNLOCK(tdvp, 0);
VOP_UNLOCK(fvp, 0);
goto releout;
}
/*
* If tvp disappeared we just carry on.
*/
if (error == EJUSTRETURN && tvp != NULL) {
vrele(tvp);
tvp = NULL;
}
/*
* Get the tvp ino if the lookup succeeded. We may have to restart
* if the non-blocking acquire fails.
*/
if (error == 0) {
nvp = NULL;
error = VFS_VGET(mp, ino, LK_EXCLUSIVE | LK_NOWAIT, &nvp);
if (tvp)
vrele(tvp);
tvp = nvp;
if (error) {
VOP_UNLOCK(fdvp, 0);
VOP_UNLOCK(tdvp, 0);
VOP_UNLOCK(fvp, 0);
if (error != EBUSY)
goto releout;
error = VFS_VGET(mp, ino, LK_EXCLUSIVE, &nvp);
if (error != 0)
goto releout;
VOP_UNLOCK(nvp, 0);
atomic_add_int(&rename_restarts, 1);
goto relock;
}
}
fdp = VTOI(fdvp);
fip = VTOI(fvp);
tdp = VTOI(tdvp);
tip = NULL;
if (tvp)
tip = VTOI(tvp);
if (tvp && ((VTOI(tvp)->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
(VTOI(tdvp)->i_flags & APPEND))) {
error = EPERM;
goto unlockout;
}
/*
* Renaming a file to itself has no effect. The upper layers should
* not call us in that case. However, things could change after
* we drop the locks above.
*/
if (fvp == tvp) {
error = 0;
goto unlockout;
}
doingdirectory = 0;
newparent = 0;
ino = fip->i_number;
if (fip->i_nlink >= LINK_MAX) {
error = EMLINK;
goto unlockout;
}
if ((fip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))
|| (fdp->i_flags & APPEND)) {
error = EPERM;
goto unlockout;
}
if ((fip->i_mode & IFMT) == IFDIR) {
/*
* Avoid ".", "..", and aliases of "." for obvious reasons.
*/
if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') ||
fdp == fip ||
(fcnp->cn_flags | tcnp->cn_flags) & ISDOTDOT) {
error = EINVAL;
goto unlockout;
}
if (fdp->i_number != tdp->i_number)
newparent = tdp->i_number;
doingdirectory = 1;
}
if ((fvp->v_type == VDIR && fvp->v_mountedhere != NULL) ||
(tvp != NULL && tvp->v_type == VDIR &&
tvp->v_mountedhere != NULL)) {
error = EXDEV;
goto unlockout;
}
/*
* 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 "..".
*/
if (doingdirectory && newparent) {
error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_thread);
if (error)
goto unlockout;
error = ufs_checkpath(ino, fdp->i_number, tdp, tcnp->cn_cred,
&ino);
/*
* We encountered a lock that we have to wait for. Unlock
* everything else and VGET before restarting.
*/
if (ino) {
VOP_UNLOCK(fdvp, 0);
VOP_UNLOCK(fvp, 0);
VOP_UNLOCK(tdvp, 0);
if (tvp)
VOP_UNLOCK(tvp, 0);
error = VFS_VGET(mp, ino, LK_SHARED, &nvp);
if (error == 0)
vput(nvp);
atomic_add_int(&rename_restarts, 1);
goto relock;
}
if (error)
goto unlockout;
if ((tcnp->cn_flags & SAVESTART) == 0)
panic("ufs_rename: lost to startdir");
}
if (fip->i_effnlink == 0 || fdp->i_effnlink == 0 ||
tdp->i_effnlink == 0)
panic("Bad effnlink fip %p, fdp %p, tdp %p", fip, fdp, tdp);
/*
* 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.
*/
fip->i_effnlink++;
fip->i_nlink++;
DIP_SET(fip, i_nlink, fip->i_nlink);
fip->i_flag |= IN_CHANGE;
if (DOINGSOFTDEP(fvp))
softdep_setup_link(tdp, fip);
error = UFS_UPDATE(fvp, !(DOINGSOFTDEP(fvp) | DOINGASYNC(fvp)));
if (error)
goto bad;
/*
* 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 (tip == NULL) {
if (tdp->i_dev != fip->i_dev)
panic("ufs_rename: EXDEV");
if (doingdirectory && newparent) {
/*
* Account for ".." in new directory.
* When source and destination have the same
* parent we don't adjust the link count. The
* actual link modification is completed when
* .. is rewritten below.
*/
if ((nlink_t)tdp->i_nlink >= LINK_MAX) {
error = EMLINK;
goto bad;
}
}
ufs_makedirentry(fip, tcnp, &newdir);
error = ufs_direnter(tdvp, NULL, &newdir, tcnp, NULL, 1);
if (error)
goto bad;
/* Setup tdvp for directory compaction if needed. */
if (tdp->i_count && tdp->i_endoff &&
tdp->i_endoff < tdp->i_size)
endoff = tdp->i_endoff;
} else {
if (tip->i_dev != tdp->i_dev || tip->i_dev != fip->i_dev)
panic("ufs_rename: EXDEV");
/*
* Short circuit rename(foo, foo).
*/
if (tip->i_number == fip->i_number)
panic("ufs_rename: same file");
/*
* If the parent directory is "sticky", then the caller
* must possess VADMIN for the parent directory, or the
* destination of the rename. This implements append-only
* directories.
*/
if ((tdp->i_mode & S_ISTXT) &&
VOP_ACCESS(tdvp, VADMIN, tcnp->cn_cred, td) &&
VOP_ACCESS(tvp, VADMIN, tcnp->cn_cred, td)) {
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 ((tip->i_mode & IFMT) == IFDIR) {
if ((tip->i_effnlink > 2) ||
!ufs_dirempty(tip, tdp->i_number, tcnp->cn_cred)) {
error = ENOTEMPTY;
goto bad;
}
if (!doingdirectory) {
error = ENOTDIR;
goto bad;
}
cache_purge(tdvp);
} else if (doingdirectory) {
error = EISDIR;
goto bad;
}
if (doingdirectory) {
if (!newparent) {
tdp->i_effnlink--;
if (DOINGSOFTDEP(tdvp))
softdep_change_linkcnt(tdp);
}
tip->i_effnlink--;
if (DOINGSOFTDEP(tvp))
softdep_change_linkcnt(tip);
}
error = ufs_dirrewrite(tdp, tip, fip->i_number,
IFTODT(fip->i_mode),
(doingdirectory && newparent) ? newparent : doingdirectory);
if (error) {
if (doingdirectory) {
if (!newparent) {
tdp->i_effnlink++;
if (DOINGSOFTDEP(tdvp))
softdep_change_linkcnt(tdp);
}
tip->i_effnlink++;
if (DOINGSOFTDEP(tvp))
softdep_change_linkcnt(tip);
}
}
if (doingdirectory && !DOINGSOFTDEP(tvp)) {
/*
* The only stuff left in the directory is "."
* and "..". The "." reference is inconsequential
* since we are quashing it. We have removed the "."
* reference and the reference in the parent directory,
* but there may be other hard links. The soft
* dependency code will arrange to do these operations
* after the parent directory entry has been deleted on
* disk, so when running with that code we avoid doing
* them now.
*/
if (!newparent) {
tdp->i_nlink--;
DIP_SET(tdp, i_nlink, tdp->i_nlink);
tdp->i_flag |= IN_CHANGE;
}
tip->i_nlink--;
DIP_SET(tip, i_nlink, tip->i_nlink);
tip->i_flag |= IN_CHANGE;
}
}
/*
* 3) Unlink the source. We have to resolve the path again to
* fixup the directory offset and count for ufs_dirremove.
*/
if (fdvp == tdvp) {
error = ufs_lookup_ino(fdvp, NULL, fcnp, &ino);
if (error)
panic("ufs_rename: from entry went away!");
if (ino != fip->i_number)
panic("ufs_rename: ino mismatch %d != %d\n", ino,
fip->i_number);
}
/*
* 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) {
/*
* If tip exists we simply use its link, otherwise we must
* add a new one.
*/
if (tip == NULL) {
tdp->i_effnlink++;
tdp->i_nlink++;
DIP_SET(tdp, i_nlink, tdp->i_nlink);
tdp->i_flag |= IN_CHANGE;
if (DOINGSOFTDEP(tdvp))
softdep_setup_dotdot_link(tdp, fip);
error = UFS_UPDATE(tdvp, !(DOINGSOFTDEP(tdvp) |
DOINGASYNC(tdvp)));
/* Don't go to bad here as the new link exists. */
if (error)
goto unlockout;
} else if (DOINGSUJ(tdvp))
/* Journal must account for each new link. */
softdep_setup_dotdot_link(tdp, fip);
fip->i_offset = mastertemplate.dot_reclen;
ufs_dirrewrite(fip, fdp, newparent, DT_DIR, 0);
cache_purge(fdvp);
}
error = ufs_dirremove(fdvp, fip, fcnp->cn_flags, 0);
/*
* The kern_renameat() looks up the fvp using the DELETE flag, which
* causes the removal of the name cache entry for fvp.
* As the relookup of the fvp is done in two steps:
* ufs_lookup_ino() and then VFS_VGET(), another thread might do a
* normal lookup of the from name just before the VFS_VGET() call,
* causing the cache entry to be re-instantiated.
*
* The same issue also applies to tvp if it exists as
* otherwise we may have a stale name cache entry for the new
* name that references the old i-node if it has other links
* or open file descriptors.
*/
cache_purge(fvp);
if (tvp)
cache_purge(tvp);
unlockout:
vput(fdvp);
vput(fvp);
if (tvp)
vput(tvp);
/*
* If compaction or fsync was requested do it now that other locks
* are no longer needed.
*/
if (error == 0 && endoff != 0) {
#ifdef UFS_DIRHASH
if (tdp->i_dirhash != NULL)
ufsdirhash_dirtrunc(tdp, endoff);
#endif
UFS_TRUNCATE(tdvp, endoff, IO_NORMAL | IO_SYNC, tcnp->cn_cred);
}
if (error == 0 && tdp->i_flag & IN_NEEDSYNC)
error = VOP_FSYNC(tdvp, MNT_WAIT, td);
vput(tdvp);
if (mp)
vfs_unbusy(mp);
return (error);
bad:
fip->i_effnlink--;
fip->i_nlink--;
DIP_SET(fip, i_nlink, fip->i_nlink);
fip->i_flag |= IN_CHANGE;
if (DOINGSOFTDEP(fvp))
softdep_revert_link(tdp, fip);
goto unlockout;
releout:
vrele(fdvp);
vrele(fvp);
vrele(tdvp);
if (tvp)
vrele(tvp);
if (mp)
vfs_unbusy(mp);
return (error);
}
#ifdef UFS_ACL
static int
ufs_do_posix1e_acl_inheritance_dir(struct vnode *dvp, struct vnode *tvp,
mode_t dmode, struct ucred *cred, struct thread *td)
{
int error;
struct inode *ip = VTOI(tvp);
struct acl *dacl, *acl;
acl = acl_alloc(M_WAITOK);
dacl = acl_alloc(M_WAITOK);
/*
* Retrieve default ACL from parent, if any.
*/
error = VOP_GETACL(dvp, ACL_TYPE_DEFAULT, acl, cred, td);
switch (error) {
case 0:
/*
* Retrieved a default ACL, so merge mode and ACL if
* necessary. If the ACL is empty, fall through to
* the "not defined or available" case.
*/
if (acl->acl_cnt != 0) {
dmode = acl_posix1e_newfilemode(dmode, acl);
ip->i_mode = dmode;
DIP_SET(ip, i_mode, dmode);
*dacl = *acl;
ufs_sync_acl_from_inode(ip, acl);
break;
}
/* FALLTHROUGH */
case EOPNOTSUPP:
/*
* Just use the mode as-is.
*/
ip->i_mode = dmode;
DIP_SET(ip, i_mode, dmode);
error = 0;
goto out;
default:
goto out;
}
/*
* XXX: If we abort now, will Soft Updates notify the extattr
* code that the EAs for the file need to be released?
*/
error = VOP_SETACL(tvp, ACL_TYPE_ACCESS, acl, cred, td);
if (error == 0)
error = VOP_SETACL(tvp, ACL_TYPE_DEFAULT, dacl, cred, td);
switch (error) {
case 0:
break;
case EOPNOTSUPP:
/*
* XXX: This should not happen, as EOPNOTSUPP above
* was supposed to free acl.
*/
printf("ufs_mkdir: VOP_GETACL() but no VOP_SETACL()\n");
/*
panic("ufs_mkdir: VOP_GETACL() but no VOP_SETACL()");
*/
break;
default:
goto out;
}
out:
acl_free(acl);
acl_free(dacl);
return (error);
}
static int
ufs_do_posix1e_acl_inheritance_file(struct vnode *dvp, struct vnode *tvp,
mode_t mode, struct ucred *cred, struct thread *td)
{
int error;
struct inode *ip = VTOI(tvp);
struct acl *acl;
acl = acl_alloc(M_WAITOK);
/*
* Retrieve default ACL for parent, if any.
*/
error = VOP_GETACL(dvp, ACL_TYPE_DEFAULT, acl, cred, td);
switch (error) {
case 0:
/*
* Retrieved a default ACL, so merge mode and ACL if
* necessary.
*/
if (acl->acl_cnt != 0) {
/*
* Two possible ways for default ACL to not
* be present. First, the EA can be
* undefined, or second, the default ACL can
* be blank. If it's blank, fall through to
* the it's not defined case.
*/
mode = acl_posix1e_newfilemode(mode, acl);
ip->i_mode = mode;
DIP_SET(ip, i_mode, mode);
ufs_sync_acl_from_inode(ip, acl);
break;
}
/* FALLTHROUGH */
case EOPNOTSUPP:
/*
* Just use the mode as-is.
*/
ip->i_mode = mode;
DIP_SET(ip, i_mode, mode);
error = 0;
goto out;
default:
goto out;
}
/*
* XXX: If we abort now, will Soft Updates notify the extattr
* code that the EAs for the file need to be released?
*/
error = VOP_SETACL(tvp, ACL_TYPE_ACCESS, acl, cred, td);
switch (error) {
case 0:
break;
case EOPNOTSUPP:
/*
* XXX: This should not happen, as EOPNOTSUPP above was
* supposed to free acl.
*/
printf("ufs_makeinode: VOP_GETACL() but no "
"VOP_SETACL()\n");
/* panic("ufs_makeinode: VOP_GETACL() but no "
"VOP_SETACL()"); */
break;
default:
goto out;
}
out:
acl_free(acl);
return (error);
}
static int
ufs_do_nfs4_acl_inheritance(struct vnode *dvp, struct vnode *tvp,
mode_t child_mode, struct ucred *cred, struct thread *td)
{
int error;
struct acl *parent_aclp, *child_aclp;
parent_aclp = acl_alloc(M_WAITOK);
child_aclp = acl_alloc(M_WAITOK | M_ZERO);
error = ufs_getacl_nfs4_internal(dvp, parent_aclp, td);
if (error)
goto out;
acl_nfs4_compute_inherited_acl(parent_aclp, child_aclp,
child_mode, VTOI(tvp)->i_uid, tvp->v_type == VDIR);
error = ufs_setacl_nfs4_internal(tvp, child_aclp, td);
if (error)
goto out;
out:
acl_free(parent_aclp);
acl_free(child_aclp);
return (error);
}
#endif
/*
* Mkdir system call
*/
static int
ufs_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 buf *bp;
struct dirtemplate dirtemplate, *dtp;
struct direct newdir;
int error, dmode;
long blkoff;
#ifdef INVARIANTS
if ((cnp->cn_flags & HASBUF) == 0)
panic("ufs_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 ufs_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 = UFS_VALLOC(dvp, dmode, cnp->cn_cred, &tvp);
if (error)
goto out;
ip = VTOI(tvp);
ip->i_gid = dp->i_gid;
DIP_SET(ip, i_gid, dp->i_gid);
#ifdef SUIDDIR
{
#ifdef QUOTA
struct ucred ucred, *ucp;
gid_t ucred_group;
ucp = cnp->cn_cred;
#endif
/*
* If we are hacking owners here, (only do this where told to)
* and we are not giving it TO 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;
DIP_SET(ip, i_uid, dp->i_uid);
#ifdef QUOTA
if (dp->i_uid != cnp->cn_cred->cr_uid) {
/*
* Make sure the correct user gets charged
* for the space.
* Make a dummy credential for the victim.
* XXX This seems to never be accessed out of
* our context so a stack variable is ok.
*/
refcount_init(&ucred.cr_ref, 1);
ucred.cr_uid = ip->i_uid;
ucred.cr_ngroups = 1;
ucred.cr_groups = &ucred_group;
ucred.cr_groups[0] = dp->i_gid;
ucp = &ucred;
}
#endif
} else {
ip->i_uid = cnp->cn_cred->cr_uid;
DIP_SET(ip, i_uid, ip->i_uid);
}
#ifdef QUOTA
if ((error = getinoquota(ip)) ||
(error = chkiq(ip, 1, ucp, 0))) {
if (DOINGSOFTDEP(tvp))
softdep_revert_link(dp, ip);
UFS_VFREE(tvp, ip->i_number, dmode);
vput(tvp);
return (error);
}
#endif
}
#else /* !SUIDDIR */
ip->i_uid = cnp->cn_cred->cr_uid;
DIP_SET(ip, i_uid, ip->i_uid);
#ifdef QUOTA
if ((error = getinoquota(ip)) ||
(error = chkiq(ip, 1, cnp->cn_cred, 0))) {
if (DOINGSOFTDEP(tvp))
softdep_revert_link(dp, ip);
UFS_VFREE(tvp, ip->i_number, dmode);
vput(tvp);
return (error);
}
#endif
#endif /* !SUIDDIR */
ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
ip->i_mode = dmode;
DIP_SET(ip, i_mode, dmode);
tvp->v_type = VDIR; /* Rest init'd in getnewvnode(). */
ip->i_effnlink = 2;
ip->i_nlink = 2;
DIP_SET(ip, i_nlink, 2);
if (cnp->cn_flags & ISWHITEOUT) {
ip->i_flags |= UF_OPAQUE;
DIP_SET(ip, i_flags, ip->i_flags);
}
/*
* Bump link count in parent directory to reflect work done below.
* Should be done before reference is created so cleanup is
* possible if we crash.
*/
dp->i_effnlink++;
dp->i_nlink++;
DIP_SET(dp, i_nlink, dp->i_nlink);
dp->i_flag |= IN_CHANGE;
if (DOINGSOFTDEP(dvp))
softdep_setup_mkdir(dp, ip);
error = UFS_UPDATE(dvp, !(DOINGSOFTDEP(dvp) | DOINGASYNC(dvp)));
if (error)
goto bad;
#ifdef MAC
if (dvp->v_mount->mnt_flag & MNT_MULTILABEL) {
error = mac_vnode_create_extattr(cnp->cn_cred, dvp->v_mount,
dvp, tvp, cnp);
if (error)
goto bad;
}
#endif
#ifdef UFS_ACL
if (dvp->v_mount->mnt_flag & MNT_ACLS) {
error = ufs_do_posix1e_acl_inheritance_dir(dvp, tvp, dmode,
cnp->cn_cred, cnp->cn_thread);
if (error)
goto bad;
} else if (dvp->v_mount->mnt_flag & MNT_NFS4ACLS) {
error = ufs_do_nfs4_acl_inheritance(dvp, tvp, dmode,
cnp->cn_cred, cnp->cn_thread);
if (error)
goto bad;
}
#endif /* !UFS_ACL */
/*
* Initialize directory with "." and ".." from static template.
*/
if (dvp->v_mount->mnt_maxsymlinklen > 0)
dtp = &mastertemplate;
else
dtp = (struct dirtemplate *)&omastertemplate;
dirtemplate = *dtp;
dirtemplate.dot_ino = ip->i_number;
dirtemplate.dotdot_ino = dp->i_number;
if ((error = UFS_BALLOC(tvp, (off_t)0, DIRBLKSIZ, cnp->cn_cred,
BA_CLRBUF, &bp)) != 0)
goto bad;
ip->i_size = DIRBLKSIZ;
DIP_SET(ip, i_size, DIRBLKSIZ);
ip->i_flag |= IN_CHANGE | IN_UPDATE;
vnode_pager_setsize(tvp, (u_long)ip->i_size);
bcopy((caddr_t)&dirtemplate, (caddr_t)bp->b_data, sizeof dirtemplate);
if (DOINGSOFTDEP(tvp)) {
/*
* Ensure that the entire newly allocated block is a
* valid directory so that future growth within the
* block does not have to ensure that the block is
* written before the inode.
*/
blkoff = DIRBLKSIZ;
while (blkoff < bp->b_bcount) {
((struct direct *)
(bp->b_data + blkoff))->d_reclen = DIRBLKSIZ;
blkoff += DIRBLKSIZ;
}
}
if ((error = UFS_UPDATE(tvp, !(DOINGSOFTDEP(tvp) |
DOINGASYNC(tvp)))) != 0) {
(void)bwrite(bp);
goto bad;
}
/*
* Directory set up, now install its entry in the parent directory.
*
* If we are not doing soft dependencies, then we must write out the
* buffer containing the new directory body before entering the new
* name in the parent. If we are doing soft dependencies, then the
* buffer containing the new directory body will be passed to and
* released in the soft dependency code after the code has attached
* an appropriate ordering dependency to the buffer which ensures that
* the buffer is written before the new name is written in the parent.
*/
if (DOINGASYNC(dvp))
bdwrite(bp);
else if (!DOINGSOFTDEP(dvp) && ((error = bwrite(bp))))
goto bad;
ufs_makedirentry(ip, cnp, &newdir);
error = ufs_direnter(dvp, tvp, &newdir, cnp, bp, 0);
bad:
if (error == 0) {
*ap->a_vpp = tvp;
} else {
dp->i_effnlink--;
dp->i_nlink--;
DIP_SET(dp, i_nlink, dp->i_nlink);
dp->i_flag |= IN_CHANGE;
/*
* No need to do an explicit VOP_TRUNCATE here, vrele will
* do this for us because we set the link count to 0.
*/
ip->i_effnlink = 0;
ip->i_nlink = 0;
DIP_SET(ip, i_nlink, 0);
ip->i_flag |= IN_CHANGE;
if (DOINGSOFTDEP(tvp))
softdep_revert_mkdir(dp, ip);
vput(tvp);
}
out:
return (error);
}
/*
* Rmdir system call.
*/
static int
ufs_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 inode *ip, *dp;
int error;
ip = VTOI(vp);
dp = VTOI(dvp);
/*
* Do not remove a directory that is in the process of being renamed.
* Verify the directory is empty (and valid). Rmdir ".." will not be
* valid since ".." will contain a reference to the current directory
* and thus be non-empty. Do not allow the removal of mounted on
* directories (this can happen when an NFS exported filesystem
* tries to remove a locally mounted on directory).
*/
error = 0;
if (ip->i_effnlink < 2) {
error = EINVAL;
goto out;
}
if (dp->i_effnlink < 3)
panic("ufs_dirrem: Bad link count %d on parent",
dp->i_effnlink);
if (!ufs_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;
}
if (vp->v_mountedhere != 0) {
error = EINVAL;
goto out;
}
#ifdef UFS_GJOURNAL
ufs_gjournal_orphan(vp);
#endif
/*
* Delete reference to directory before purging
* inode. If we crash in between, the directory
* will be reattached to lost+found,
*/
dp->i_effnlink--;
ip->i_effnlink--;
if (DOINGSOFTDEP(vp))
softdep_setup_rmdir(dp, ip);
error = ufs_dirremove(dvp, ip, cnp->cn_flags, 1);
if (error) {
dp->i_effnlink++;
ip->i_effnlink++;
if (DOINGSOFTDEP(vp))
softdep_revert_rmdir(dp, ip);
goto out;
}
cache_purge(dvp);
/*
* The only stuff left in the directory is "." and "..". The "."
* reference is inconsequential since we are quashing it. The soft
* dependency code will arrange to do these operations after
* the parent directory entry has been deleted on disk, so
* when running with that code we avoid doing them now.
*/
if (!DOINGSOFTDEP(vp)) {
dp->i_nlink--;
DIP_SET(dp, i_nlink, dp->i_nlink);
dp->i_flag |= IN_CHANGE;
error = UFS_UPDATE(dvp, 0);
ip->i_nlink--;
DIP_SET(ip, i_nlink, ip->i_nlink);
ip->i_flag |= IN_CHANGE;
}
cache_purge(vp);
#ifdef UFS_DIRHASH
/* Kill any active hash; i_effnlink == 0, so it will not come back. */
if (ip->i_dirhash != NULL)
ufsdirhash_free(ip);
#endif
out:
return (error);
}
/*
* symlink -- make a symbolic link
*/
static int
ufs_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 = ufs_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, SHORTLINK(ip), len);
ip->i_size = len;
DIP_SET(ip, i_size, len);
ip->i_flag |= IN_CHANGE | IN_UPDATE;
error = UFS_UPDATE(vp, 0);
} 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, NULL, NULL);
if (error)
vput(vp);
return (error);
}
/*
* Vnode op for reading directories.
*
* The routine below assumes that the on-disk format of a directory
* is the same as that defined by <sys/dirent.h>. If the on-disk
* format changes, then it will be necessary to do a conversion
* from the on-disk format that read returns to the format defined
* by <sys/dirent.h>.
*/
int
ufs_readdir(ap)
struct vop_readdir_args /* {
struct vnode *a_vp;
struct uio *a_uio;
struct ucred *a_cred;
int *a_eofflag;
int *a_ncookies;
u_long **a_cookies;
} */ *ap;
{
struct uio *uio = ap->a_uio;
struct inode *ip;
int error;
size_t count, lost;
off_t off;
if (ap->a_ncookies != NULL)
/*
* Ensure that the block is aligned. The caller can use
* the cookies to determine where in the block to start.
*/
uio->uio_offset &= ~(DIRBLKSIZ - 1);
ip = VTOI(ap->a_vp);
if (ip->i_effnlink == 0)
return (0);
off = uio->uio_offset;
count = uio->uio_resid;
/* Make sure we don't return partial entries. */
if (count <= ((uio->uio_offset + count) & (DIRBLKSIZ -1)))
return (EINVAL);
count -= (uio->uio_offset + count) & (DIRBLKSIZ -1);
lost = uio->uio_resid - count;
uio->uio_resid = count;
uio->uio_iov->iov_len = count;
# if (BYTE_ORDER == LITTLE_ENDIAN)
if (ap->a_vp->v_mount->mnt_maxsymlinklen > 0) {
error = VOP_READ(ap->a_vp, uio, 0, ap->a_cred);
} else {
struct dirent *dp, *edp;
struct uio auio;
struct iovec aiov;
caddr_t dirbuf;
int readcnt;
u_char tmp;
auio = *uio;
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
auio.uio_segflg = UIO_SYSSPACE;
aiov.iov_len = count;
dirbuf = malloc(count, M_TEMP, M_WAITOK);
aiov.iov_base = dirbuf;
error = VOP_READ(ap->a_vp, &auio, 0, ap->a_cred);
if (error == 0) {
readcnt = count - auio.uio_resid;
edp = (struct dirent *)&dirbuf[readcnt];
for (dp = (struct dirent *)dirbuf; dp < edp; ) {
tmp = dp->d_namlen;
dp->d_namlen = dp->d_type;
dp->d_type = tmp;
if (dp->d_reclen > 0) {
dp = (struct dirent *)
((char *)dp + dp->d_reclen);
} else {
error = EIO;
break;
}
}
if (dp >= edp)
error = uiomove(dirbuf, readcnt, uio);
}
free(dirbuf, M_TEMP);
}
# else
error = VOP_READ(ap->a_vp, uio, 0, ap->a_cred);
# endif
if (!error && ap->a_ncookies != NULL) {
struct dirent* dpStart;
struct dirent* dpEnd;
struct dirent* dp;
int ncookies;
u_long *cookies;
u_long *cookiep;
if (uio->uio_segflg != UIO_SYSSPACE || uio->uio_iovcnt != 1)
panic("ufs_readdir: unexpected uio from NFS server");
dpStart = (struct dirent *)
((char *)uio->uio_iov->iov_base - (uio->uio_offset - off));
dpEnd = (struct dirent *) uio->uio_iov->iov_base;
for (dp = dpStart, ncookies = 0;
dp < dpEnd;
dp = (struct dirent *)((caddr_t) dp + dp->d_reclen))
ncookies++;
cookies = malloc(ncookies * sizeof(u_long), M_TEMP,
M_WAITOK);
for (dp = dpStart, cookiep = cookies;
dp < dpEnd;
dp = (struct dirent *)((caddr_t) dp + dp->d_reclen)) {
off += dp->d_reclen;
*cookiep++ = (u_long) off;
}
*ap->a_ncookies = ncookies;
*ap->a_cookies = cookies;
}
uio->uio_resid += lost;
if (ap->a_eofflag)
*ap->a_eofflag = VTOI(ap->a_vp)->i_size <= uio->uio_offset;
return (error);
}
/*
* Return target name of a symbolic link
*/
static int
ufs_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);
doff_t isize;
isize = ip->i_size;
if ((isize < vp->v_mount->mnt_maxsymlinklen) ||
DIP(ip, i_blocks) == 0) { /* XXX - for old fastlink support */
return (uiomove(SHORTLINK(ip), isize, ap->a_uio));
}
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 ufs_bmaparray() operation may not
* deadlock on memory. See ufs_bmap() for details.
*/
static int
ufs_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 bufobj *bo;
struct inode *ip;
ufs2_daddr_t blkno;
int error;
ip = VTOI(vp);
if (bp->b_blkno == bp->b_lblkno) {
error = ufs_bmaparray(vp, bp->b_lblkno, &blkno, bp, NULL, NULL);
bp->b_blkno = blkno;
if (error) {
bp->b_error = error;
bp->b_ioflags |= BIO_ERROR;
bufdone(bp);
return (0);
}
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 = ip->i_umbufobj;
BO_STRATEGY(bo, bp);
return (0);
}
/*
* Print out the contents of an inode.
*/
static int
ufs_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", (u_long)ip->i_number,
devtoname(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
ufsfifo_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;
int usecount;
VI_LOCK(vp);
usecount = vp->v_usecount;
if (usecount > 1)
ufs_itimes_locked(vp);
VI_UNLOCK(vp);
return (fifo_specops.vop_close(ap));
}
/*
* Kqfilter wrapper for fifos.
*
* Fall through to ufs kqfilter routines if needed
*/
static int
ufsfifo_kqfilter(ap)
struct vop_kqfilter_args *ap;
{
int error;
error = fifo_specops.vop_kqfilter(ap);
if (error)
error = vfs_kqfilter(ap);
return (error);
}
/*
* Return POSIX pathconf information applicable to fifos.
*/
static int
ufsfifo_pathconf(ap)
struct vop_pathconf_args /* {
struct vnode *a_vp;
int a_name;
int *a_retval;
} */ *ap;
{
switch (ap->a_name) {
case _PC_ACL_EXTENDED:
case _PC_ACL_NFS4:
case _PC_ACL_PATH_MAX:
case _PC_MAC_PRESENT:
return (ufs_pathconf(ap));
default:
return (fifo_specops.vop_pathconf(ap));
}
/* NOTREACHED */
}
/*
* Return POSIX pathconf information applicable to ufs filesystems.
*/
static int
ufs_pathconf(ap)
struct vop_pathconf_args /* {
struct vnode *a_vp;
int a_name;
int *a_retval;
} */ *ap;
{
int error;
error = 0;
switch (ap->a_name) {
case _PC_LINK_MAX:
*ap->a_retval = LINK_MAX;
break;
case _PC_NAME_MAX:
*ap->a_retval = NAME_MAX;
break;
case _PC_PATH_MAX:
*ap->a_retval = PATH_MAX;
break;
case _PC_PIPE_BUF:
*ap->a_retval = PIPE_BUF;
break;
case _PC_CHOWN_RESTRICTED:
*ap->a_retval = 1;
break;
case _PC_NO_TRUNC:
*ap->a_retval = 1;
break;
case _PC_ACL_EXTENDED:
#ifdef UFS_ACL
if (ap->a_vp->v_mount->mnt_flag & MNT_ACLS)
*ap->a_retval = 1;
else
*ap->a_retval = 0;
#else
*ap->a_retval = 0;
#endif
break;
case _PC_ACL_NFS4:
#ifdef UFS_ACL
if (ap->a_vp->v_mount->mnt_flag & MNT_NFS4ACLS)
*ap->a_retval = 1;
else
*ap->a_retval = 0;
#else
*ap->a_retval = 0;
#endif
break;
case _PC_ACL_PATH_MAX:
#ifdef UFS_ACL
if (ap->a_vp->v_mount->mnt_flag & (MNT_ACLS | MNT_NFS4ACLS))
*ap->a_retval = ACL_MAX_ENTRIES;
else
*ap->a_retval = 3;
#else
*ap->a_retval = 3;
#endif
break;
case _PC_MAC_PRESENT:
#ifdef MAC
if (ap->a_vp->v_mount->mnt_flag & MNT_MULTILABEL)
*ap->a_retval = 1;
else
*ap->a_retval = 0;
#else
*ap->a_retval = 0;
#endif
break;
case _PC_ASYNC_IO:
/* _PC_ASYNC_IO should have been handled by upper layers. */
KASSERT(0, ("_PC_ASYNC_IO should not get here"));
error = EINVAL;
break;
case _PC_PRIO_IO:
*ap->a_retval = 0;
break;
case _PC_SYNC_IO:
*ap->a_retval = 0;
break;
case _PC_ALLOC_SIZE_MIN:
*ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_bsize;
break;
case _PC_FILESIZEBITS:
*ap->a_retval = 64;
break;
case _PC_REC_INCR_XFER_SIZE:
*ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize;
break;
case _PC_REC_MAX_XFER_SIZE:
*ap->a_retval = -1; /* means ``unlimited'' */
break;
case _PC_REC_MIN_XFER_SIZE:
*ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize;
break;
case _PC_REC_XFER_ALIGN:
*ap->a_retval = PAGE_SIZE;
break;
case _PC_SYMLINK_MAX:
*ap->a_retval = MAXPATHLEN;
break;
default:
error = EINVAL;
break;
}
return (error);
}
/*
* Initialize the vnode associated with a new inode, handle aliased
* vnodes.
*/
int
ufs_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;
ASSERT_VOP_LOCKED(vp, "ufs_vinit");
if (ip->i_number == ROOTINO)
vp->v_vflag |= VV_ROOT;
*vpp = vp;
return (0);
}
/*
* Allocate a new inode.
* Vnode dvp must be locked.
*/
static int
ufs_makeinode(mode, dvp, vpp, cnp)
int mode;
struct vnode *dvp;
struct vnode **vpp;
struct componentname *cnp;
{
struct inode *ip, *pdir;
struct direct newdir;
struct vnode *tvp;
int error;
pdir = VTOI(dvp);
#ifdef INVARIANTS
if ((cnp->cn_flags & HASBUF) == 0)
panic("ufs_makeinode: no name");
#endif
*vpp = NULL;
if ((mode & IFMT) == 0)
mode |= IFREG;
if (VTOI(dvp)->i_effnlink < 2)
panic("ufs_makeinode: Bad link count %d on parent",
VTOI(dvp)->i_effnlink);
error = UFS_VALLOC(dvp, mode, cnp->cn_cred, &tvp);
if (error)
return (error);
ip = VTOI(tvp);
ip->i_gid = pdir->i_gid;
DIP_SET(ip, i_gid, pdir->i_gid);
#ifdef SUIDDIR
{
#ifdef QUOTA
struct ucred ucred, *ucp;
gid_t ucred_group;
ucp = cnp->cn_cred;
#endif
/*
* 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 TO 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;
DIP_SET(ip, i_uid, ip->i_uid);
mode &= ~07111;
#ifdef QUOTA
/*
* Make sure the correct user gets charged
* for the space.
* Quickly knock up a dummy credential for the victim.
* XXX This seems to never be accessed out of our
* context so a stack variable is ok.
*/
refcount_init(&ucred.cr_ref, 1);
ucred.cr_uid = ip->i_uid;
ucred.cr_ngroups = 1;
ucred.cr_groups = &ucred_group;
ucred.cr_groups[0] = pdir->i_gid;
ucp = &ucred;
#endif
} else {
ip->i_uid = cnp->cn_cred->cr_uid;
DIP_SET(ip, i_uid, ip->i_uid);
}
#ifdef QUOTA
if ((error = getinoquota(ip)) ||
(error = chkiq(ip, 1, ucp, 0))) {
if (DOINGSOFTDEP(tvp))
softdep_revert_link(pdir, ip);
UFS_VFREE(tvp, ip->i_number, mode);
vput(tvp);
return (error);
}
#endif
}
#else /* !SUIDDIR */
ip->i_uid = cnp->cn_cred->cr_uid;
DIP_SET(ip, i_uid, ip->i_uid);
#ifdef QUOTA
if ((error = getinoquota(ip)) ||
(error = chkiq(ip, 1, cnp->cn_cred, 0))) {
if (DOINGSOFTDEP(tvp))
softdep_revert_link(pdir, ip);
UFS_VFREE(tvp, ip->i_number, mode);
vput(tvp);
return (error);
}
#endif
#endif /* !SUIDDIR */
ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
ip->i_mode = mode;
DIP_SET(ip, i_mode, mode);
tvp->v_type = IFTOVT(mode); /* Rest init'd in getnewvnode(). */
ip->i_effnlink = 1;
ip->i_nlink = 1;
DIP_SET(ip, i_nlink, 1);
if (DOINGSOFTDEP(tvp))
softdep_setup_create(VTOI(dvp), ip);
if ((ip->i_mode & ISGID) && !groupmember(ip->i_gid, cnp->cn_cred) &&
priv_check_cred(cnp->cn_cred, PRIV_VFS_SETGID, 0)) {
ip->i_mode &= ~ISGID;
DIP_SET(ip, i_mode, ip->i_mode);
}
if (cnp->cn_flags & ISWHITEOUT) {
ip->i_flags |= UF_OPAQUE;
DIP_SET(ip, i_flags, ip->i_flags);
}
/*
* Make sure inode goes to disk before directory entry.
*/
error = UFS_UPDATE(tvp, !(DOINGSOFTDEP(tvp) | DOINGASYNC(tvp)));
if (error)
goto bad;
#ifdef MAC
if (dvp->v_mount->mnt_flag & MNT_MULTILABEL) {
error = mac_vnode_create_extattr(cnp->cn_cred, dvp->v_mount,
dvp, tvp, cnp);
if (error)
goto bad;
}
#endif
#ifdef UFS_ACL
if (dvp->v_mount->mnt_flag & MNT_ACLS) {
error = ufs_do_posix1e_acl_inheritance_file(dvp, tvp, mode,
cnp->cn_cred, cnp->cn_thread);
if (error)
goto bad;
} else if (dvp->v_mount->mnt_flag & MNT_NFS4ACLS) {
error = ufs_do_nfs4_acl_inheritance(dvp, tvp, mode,
cnp->cn_cred, cnp->cn_thread);
if (error)
goto bad;
}
#endif /* !UFS_ACL */
ufs_makedirentry(ip, cnp, &newdir);
error = ufs_direnter(dvp, tvp, &newdir, cnp, NULL, 0);
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_effnlink = 0;
ip->i_nlink = 0;
DIP_SET(ip, i_nlink, 0);
ip->i_flag |= IN_CHANGE;
if (DOINGSOFTDEP(tvp))
softdep_revert_create(VTOI(dvp), ip);
vput(tvp);
return (error);
}
/* Global vfs data structures for ufs. */
struct vop_vector ufs_vnodeops = {
.vop_default = &default_vnodeops,
.vop_fsync = VOP_PANIC,
.vop_read = VOP_PANIC,
.vop_reallocblks = VOP_PANIC,
.vop_write = VOP_PANIC,
.vop_accessx = ufs_accessx,
.vop_bmap = ufs_bmap,
.vop_cachedlookup = ufs_lookup,
.vop_close = ufs_close,
.vop_create = ufs_create,
.vop_getattr = ufs_getattr,
.vop_inactive = ufs_inactive,
.vop_link = ufs_link,
.vop_lookup = vfs_cache_lookup,
.vop_markatime = ufs_markatime,
.vop_mkdir = ufs_mkdir,
.vop_mknod = ufs_mknod,
.vop_open = ufs_open,
.vop_pathconf = ufs_pathconf,
.vop_poll = vop_stdpoll,
.vop_print = ufs_print,
.vop_readdir = ufs_readdir,
.vop_readlink = ufs_readlink,
.vop_reclaim = ufs_reclaim,
.vop_remove = ufs_remove,
.vop_rename = ufs_rename,
.vop_rmdir = ufs_rmdir,
.vop_setattr = ufs_setattr,
#ifdef MAC
.vop_setlabel = vop_stdsetlabel_ea,
#endif
.vop_strategy = ufs_strategy,
.vop_symlink = ufs_symlink,
.vop_whiteout = ufs_whiteout,
#ifdef UFS_EXTATTR
.vop_getextattr = ufs_getextattr,
.vop_deleteextattr = ufs_deleteextattr,
.vop_setextattr = ufs_setextattr,
#endif
#ifdef UFS_ACL
.vop_getacl = ufs_getacl,
.vop_setacl = ufs_setacl,
.vop_aclcheck = ufs_aclcheck,
#endif
};
struct vop_vector ufs_fifoops = {
.vop_default = &fifo_specops,
.vop_fsync = VOP_PANIC,
.vop_accessx = ufs_accessx,
.vop_close = ufsfifo_close,
.vop_getattr = ufs_getattr,
.vop_inactive = ufs_inactive,
.vop_kqfilter = ufsfifo_kqfilter,
.vop_markatime = ufs_markatime,
.vop_pathconf = ufsfifo_pathconf,
.vop_print = ufs_print,
.vop_read = VOP_PANIC,
.vop_reclaim = ufs_reclaim,
.vop_setattr = ufs_setattr,
#ifdef MAC
.vop_setlabel = vop_stdsetlabel_ea,
#endif
.vop_write = VOP_PANIC,
#ifdef UFS_EXTATTR
.vop_getextattr = ufs_getextattr,
.vop_deleteextattr = ufs_deleteextattr,
.vop_setextattr = ufs_setextattr,
#endif
#ifdef UFS_ACL
.vop_getacl = ufs_getacl,
.vop_setacl = ufs_setacl,
.vop_aclcheck = ufs_aclcheck,
#endif
};
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