/* $OpenBSD: ufs_vnops.c,v 1.82 2007/06/20 15:03:40 thib Exp $ */
/* $NetBSD: ufs_vnops.c,v 1.18 1996/05/11 18:28:04 mycroft Exp $ */
/*
* Copyright (c) 1982, 1986, 1989, 1993
* The Regents of the University of California. All rights reserved.
* (c) UNIX System Laboratories, Inc.
* All or some portions of this file are derived from material licensed
* to the University of California by American Telephone and Telegraph
* Co. or Unix System Laboratories, Inc. and are reproduced herein with
* the permission of UNIX System Laboratories, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)ufs_vnops.c 8.14 (Berkeley) 10/26/94
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/namei.h>
#include <sys/resourcevar.h>
#include <sys/kernel.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/buf.h>
#include <sys/proc.h>
#include <sys/conf.h>
#include <sys/mount.h>
#include <sys/vnode.h>
#include <sys/malloc.h>
#include <sys/pool.h>
#include <sys/dirent.h>
#include <sys/lockf.h>
#include <sys/event.h>
#include <sys/poll.h>
#include <uvm/uvm_extern.h>
#include <miscfs/specfs/specdev.h>
#include <miscfs/fifofs/fifo.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
#include <ufs/ext2fs/ext2fs_extern.h>
static int ufs_chmod(struct vnode *, int, struct ucred *, struct proc *);
static int ufs_chown(struct vnode *, uid_t, gid_t, struct ucred *, struct proc *);
int filt_ufsread(struct knote *, long);
int filt_ufswrite(struct knote *, long);
int filt_ufsvnode(struct knote *, long);
void filt_ufsdetach(struct knote *);
union _qcvt {
int64_t qcvt;
int32_t val[2];
};
#define SETHIGH(q, h) { \
union _qcvt tmp; \
tmp.qcvt = (q); \
tmp.val[_QUAD_HIGHWORD] = (h); \
(q) = tmp.qcvt; \
}
#define SETLOW(q, l) { \
union _qcvt tmp; \
tmp.qcvt = (q); \
tmp.val[_QUAD_LOWWORD] = (l); \
(q) = tmp.qcvt; \
}
/*
* 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, ".."
};
/*
* Create a regular file
*/
int
ufs_create(void *v)
{
struct vop_create_args *ap = v;
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);
VN_KNOTE(ap->a_dvp, NOTE_WRITE);
return (0);
}
/*
* Mknod vnode call
*/
/* ARGSUSED */
int
ufs_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;
if ((error =
ufs_makeinode(MAKEIMODE(vap->va_type, vap->va_mode),
ap->a_dvp, vpp, ap->a_cnp)) != 0)
return (error);
VN_KNOTE(ap->a_dvp, NOTE_WRITE);
ip = VTOI(*vpp);
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_ASSIGN(ip, rdev, 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 = 0;
return (0);
}
/*
* Open called.
*
* Nothing to do.
*/
/* ARGSUSED */
int
ufs_open(void *v)
{
struct vop_open_args *ap = v;
struct inode *ip = VTOI(ap->a_vp);
/*
* Files marked append-only must be opened for appending.
*/
if ((DIP(ip, flags) & APPEND) &&
(ap->a_mode & (FWRITE | O_APPEND)) == FWRITE)
return (EPERM);
if (ap->a_mode & O_TRUNC)
ip->i_flag |= IN_CHANGE | IN_UPDATE;
return (0);
}
/*
* Close called.
*
* Update the times on the inode.
*/
/* ARGSUSED */
int
ufs_close(void *v)
{
struct vop_close_args *ap = v;
struct vnode *vp = ap->a_vp;
struct inode *ip = VTOI(vp);
if (vp->v_usecount > 1) {
struct timeval tv;
getmicrotime(&tv);
ITIMES(ip, &tv, &tv);
}
return (0);
}
int
ufs_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;
/*
* Disallow write attempts on read-only file systems;
* unless the file is a socket, fifo, or a block or
* character device resident on the file system.
*/
if (mode & VWRITE) {
switch (vp->v_type) {
int error;
case VDIR:
case VLNK:
case VREG:
if (vp->v_mount->mnt_flag & MNT_RDONLY)
return (EROFS);
if ((error = getinoquota(ip)) != 0)
return (error);
break;
case VBAD:
case VBLK:
case VCHR:
case VSOCK:
case VFIFO:
case VNON:
break;
}
}
/* If immutable bit set, nobody gets to write it. */
if ((mode & VWRITE) && (DIP(ip, flags) & IMMUTABLE))
return (EPERM);
return (vaccess(DIP(ip, mode), DIP(ip, uid), DIP(ip, gid), mode,
ap->a_cred));
}
/* ARGSUSED */
int
ufs_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;
struct timeval tv;
getmicrotime(&tv);
ITIMES(ip, &tv, &tv);
/*
* Copy from inode table
*/
vap->va_fsid = ip->i_dev;
vap->va_fileid = ip->i_number;
vap->va_mode = DIP(ip, mode) & ~IFMT;
vap->va_nlink = ip->i_effnlink;
vap->va_uid = DIP(ip, uid);
vap->va_gid = DIP(ip, gid);
vap->va_rdev = (dev_t) DIP(ip, rdev);
vap->va_size = DIP(ip, size);
vap->va_atime.tv_sec = DIP(ip, atime);
vap->va_atime.tv_nsec = DIP(ip, atimensec);
vap->va_mtime.tv_sec = DIP(ip, mtime);
vap->va_mtime.tv_nsec = DIP(ip, mtimensec);
vap->va_ctime.tv_sec = DIP(ip, ctime);
vap->va_ctime.tv_nsec = DIP(ip, ctimensec);
vap->va_flags = DIP(ip, flags);
vap->va_gen = DIP(ip, 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) DIP(ip, blocks));
vap->va_type = vp->v_type;
vap->va_filerev = ip->i_modrev;
return (0);
}
/*
* Set attribute vnode op. called from several syscalls
*/
int
ufs_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;
struct proc *p = ap->a_p;
int error;
long hint = NOTE_ATTRIB;
u_quad_t oldsize;
/*
* 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 != DIP(ip, uid) &&
(error = suser_ucred(cred)))
return (error);
if (cred->cr_uid == 0) {
if ((DIP(ip, flags) & (SF_IMMUTABLE | SF_APPEND)) &&
securelevel > 0)
return (EPERM);
DIP_ASSIGN(ip, flags, vap->va_flags);
} else {
if (DIP(ip, flags) & (SF_IMMUTABLE | SF_APPEND) ||
(vap->va_flags & UF_SETTABLE) != vap->va_flags)
return (EPERM);
DIP(ip, flags) &= SF_SETTABLE;
DIP(ip, flags) |= (vap->va_flags & UF_SETTABLE);
}
ip->i_flag |= IN_CHANGE;
if (vap->va_flags & (IMMUTABLE | APPEND))
return (0);
}
if (DIP(ip, flags) & (IMMUTABLE | APPEND))
return (EPERM);
/*
* Go through the fields and update if 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 = ufs_chown(vp, vap->va_uid, vap->va_gid, cred, p);
if (error)
return (error);
}
if (vap->va_size != VNOVAL) {
oldsize = DIP(ip, size);
/*
* Disallow write attempts on read-only file systems;
* unless the file is a socket, fifo, or a block or
* character device resident on the file system.
*/
switch (vp->v_type) {
case VDIR:
return (EISDIR);
case VLNK:
case VREG:
if (vp->v_mount->mnt_flag & MNT_RDONLY)
return (EROFS);
break;
default:
break;
}
if ((error = UFS_TRUNCATE(ip, vap->va_size, 0, cred)) != 0)
return (error);
if (vap->va_size < oldsize)
hint |= NOTE_TRUNCATE;
}
if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
if (vp->v_mount->mnt_flag & MNT_RDONLY)
return (EROFS);
if (cred->cr_uid != DIP(ip, uid) &&
(error = suser_ucred(cred)) &&
((vap->va_vaflags & VA_UTIMES_NULL) == 0 ||
(error = VOP_ACCESS(vp, VWRITE, cred, p))))
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;
error = UFS_UPDATE2(ip, &vap->va_atime, &vap->va_mtime, 0);
if (error)
return (error);
}
error = 0;
if (vap->va_mode != (mode_t)VNOVAL) {
if (vp->v_mount->mnt_flag & MNT_RDONLY)
return (EROFS);
error = ufs_chmod(vp, (int)vap->va_mode, cred, p);
}
VN_KNOTE(vp, hint);
return (error);
}
/*
* Change the mode on a file.
* Inode must be locked before calling.
*/
static int
ufs_chmod(struct vnode *vp, int mode, struct ucred *cred, struct proc *p)
{
struct inode *ip = VTOI(vp);
int error;
if (cred->cr_uid != DIP(ip, uid) &&
(error = suser_ucred(cred)))
return (error);
if (cred->cr_uid) {
if (vp->v_type != VDIR && (mode & S_ISTXT))
return (EFTYPE);
if (!groupmember(DIP(ip, gid), cred) && (mode & ISGID))
return (EPERM);
}
DIP(ip, mode) &= ~ALLPERMS;
DIP(ip, mode) |= (mode & ALLPERMS);
ip->i_flag |= IN_CHANGE;
if ((vp->v_flag & VTEXT) && (DIP(ip, 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
ufs_chown(struct vnode *vp, uid_t uid, gid_t gid, struct ucred *cred,
struct proc *p)
{
struct inode *ip = VTOI(vp);
uid_t ouid;
gid_t ogid;
int error = 0;
daddr_t change;
enum ufs_quota_flags quota_flags = 0;
if (uid == (uid_t)VNOVAL)
uid = DIP(ip, uid);
if (gid == (gid_t)VNOVAL)
gid = DIP(ip, 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 != DIP(ip, uid) || uid != DIP(ip, uid) ||
(gid != DIP(ip, gid) && !groupmember((gid_t)gid, cred))) &&
(error = suser_ucred(cred)))
return (error);
ogid = DIP(ip, gid);
ouid = DIP(ip, uid);
change = DIP(ip, blocks);
if (ouid == uid)
quota_flags |= UFS_QUOTA_NOUID;
if (ogid == gid)
quota_flags |= UFS_QUOTA_NOGID;
if ((error = getinoquota(ip)) != 0)
return (error);
(void) ufs_quota_free_blocks2(ip, change, cred, quota_flags);
(void) ufs_quota_free_inode2(ip, cred, quota_flags);
(void) ufs_quota_delete(ip);
DIP_ASSIGN(ip, gid, gid);
DIP_ASSIGN(ip, uid, uid);
if ((error = getinoquota(ip)) != 0)
goto error;
if ((error = ufs_quota_alloc_blocks2(ip, change, cred,
quota_flags)) != 0)
goto error;
if ((error = ufs_quota_alloc_inode2(ip, cred ,
quota_flags)) != 0) {
(void)ufs_quota_free_blocks2(ip, change, cred,
quota_flags);
goto error;
}
if (getinoquota(ip))
panic("chown: lost quota");
if (ouid != uid || ogid != gid)
ip->i_flag |= IN_CHANGE;
if (ouid != uid && cred->cr_uid != 0)
DIP(ip, mode) &= ~ISUID;
if (ogid != gid && cred->cr_uid != 0)
DIP(ip, mode) &= ~ISGID;
return (0);
error:
(void) ufs_quota_delete(ip);
DIP_ASSIGN(ip, gid, ogid);
DIP_ASSIGN(ip, uid, ouid);
if (getinoquota(ip) == 0) {
(void) ufs_quota_alloc_blocks2(ip, change, cred,
quota_flags | UFS_QUOTA_FORCE);
(void) ufs_quota_alloc_inode2(ip, cred,
quota_flags | UFS_QUOTA_FORCE);
(void) getinoquota(ip);
}
return (error);
}
/* ARGSUSED */
int
ufs_ioctl(void *v)
{
#if 0
struct vop_ioctl_args *ap = v;
#endif
return (ENOTTY);
}
/* ARGSUSED */
int
ufs_poll(void *v)
{
struct vop_poll_args *ap = v;
/*
* We should really check to see if I/O is possible.
*/
return (ap->a_events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM));
}
int
ufs_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 || (DIP(ip, flags) & (IMMUTABLE | APPEND)) ||
(DIP(VTOI(dvp), flags) & APPEND)) {
error = EPERM;
goto out;
}
error = ufs_dirremove(dvp, ip, ap->a_cnp->cn_flags, 0);
VN_KNOTE(vp, NOTE_DELETE);
VN_KNOTE(dvp, NOTE_WRITE);
out:
if (dvp == vp)
vrele(vp);
else
vput(vp);
vput(dvp);
return (error);
}
/*
* link vnode call
*/
int
ufs_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 proc *p = cnp->cn_proc;
struct inode *ip;
struct direct newdir;
int error;
#ifdef DIAGNOSTIC
if ((cnp->cn_flags & HASBUF) == 0)
panic("ufs_link: no name");
#endif
if (vp->v_type == VDIR) {
VOP_ABORTOP(dvp, cnp);
error = EPERM;
goto out2;
}
if (dvp->v_mount != vp->v_mount) {
VOP_ABORTOP(dvp, cnp);
error = EXDEV;
goto out2;
}
if (dvp != vp && (error = vn_lock(vp, LK_EXCLUSIVE, p))) {
VOP_ABORTOP(dvp, cnp);
goto out2;
}
ip = VTOI(vp);
if ((nlink_t) DIP(ip, nlink) >= LINK_MAX) {
VOP_ABORTOP(dvp, cnp);
error = EMLINK;
goto out1;
}
if (DIP(ip, flags) & (IMMUTABLE | APPEND)) {
VOP_ABORTOP(dvp, cnp);
error = EPERM;
goto out1;
}
ip->i_effnlink++;
DIP_ADD(ip, nlink, 1);
ip->i_flag |= IN_CHANGE;
if (DOINGSOFTDEP(vp))
softdep_change_linkcnt(ip, 0);
if ((error = UFS_UPDATE(ip, !DOINGSOFTDEP(vp))) == 0) {
ufs_makedirentry(ip, cnp, &newdir);
error = ufs_direnter(dvp, vp, &newdir, cnp, NULL);
}
if (error) {
ip->i_effnlink--;
DIP_ADD(ip, nlink, -1);
ip->i_flag |= IN_CHANGE;
if (DOINGSOFTDEP(vp))
softdep_change_linkcnt(ip, 0);
}
pool_put(&namei_pool, cnp->cn_pnbuf);
VN_KNOTE(vp, NOTE_LINK);
VN_KNOTE(dvp, NOTE_WRITE);
out1:
if (dvp != vp)
VOP_UNLOCK(vp, 0, p);
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
ufs_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 proc *p = fcnp->cn_proc;
struct inode *ip, *xp, *dp;
struct direct newdir;
int doingdirectory = 0, oldparent = 0, newparent = 0;
int error = 0;
#ifdef DIAGNOSTIC
if ((tcnp->cn_flags & HASBUF) == 0 ||
(fcnp->cn_flags & HASBUF) == 0)
panic("ufs_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);
if (tdvp == tvp)
vrele(tdvp);
else
vput(tdvp);
if (tvp)
vput(tvp);
VOP_ABORTOP(fdvp, fcnp);
vrele(fdvp);
vrele(fvp);
return (error);
}
if (tvp && ((DIP(VTOI(tvp), flags) & (IMMUTABLE | APPEND)) ||
(DIP(VTOI(tdvp), flags) & APPEND))) {
error = EPERM;
goto abortit;
}
/*
* Check if just deleting a link name or if we've lost a race.
* If another process completes the same rename after we've looked
* up the source and have blocked looking up the target, then the
* source and target inodes may be identical now although the
* names were never linked.
*/
if (fvp == tvp) {
if (fvp->v_type == VDIR) {
/*
* Linked directories are impossible, so we must
* have lost the race. Pretend that the rename
* completed before the lookup.
*/
error = ENOENT;
goto abortit;
}
/* Release destination completely. */
VOP_ABORTOP(tdvp, tcnp);
vput(tdvp);
vput(tvp);
/*
* Delete source. There is another race now that everything
* is unlocked, but this doesn't cause any new complications.
* relookup() may find a file that is unrelated to the
* original one, or it may fail. Too bad.
*/
vrele(fvp);
fcnp->cn_flags &= ~MODMASK;
fcnp->cn_flags |= LOCKPARENT | LOCKLEAF;
if ((fcnp->cn_flags & SAVESTART) == 0)
panic("ufs_rename: lost from startdir");
fcnp->cn_nameiop = DELETE;
if ((error = relookup(fdvp, &fvp, fcnp)) != 0)
return (error); /* relookup did vrele() */
vrele(fdvp);
return (VOP_REMOVE(fdvp, fvp, fcnp));
}
if ((error = vn_lock(fvp, LK_EXCLUSIVE, p)) != 0)
goto abortit;
/* fvp, tdvp, tvp now locked */
dp = VTOI(fdvp);
ip = VTOI(fvp);
if ((nlink_t) DIP(ip, nlink) >= LINK_MAX) {
VOP_UNLOCK(fvp, 0, p);
error = EMLINK;
goto abortit;
}
if ((DIP(ip, flags) & (IMMUTABLE | APPEND)) ||
(DIP(dp, flags) & APPEND)) {
VOP_UNLOCK(fvp, 0, p);
error = EPERM;
goto abortit;
}
if ((DIP(ip, 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, 0, p);
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, 0, p);
error = EINVAL;
goto abortit;
}
ip->i_flag |= IN_RENAME;
oldparent = dp->i_number;
doingdirectory = 1;
}
VN_KNOTE(fdvp, NOTE_WRITE); /* XXX right place? */
/*
* 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_effnlink++;
DIP_ADD(ip, nlink, 1);
ip->i_flag |= IN_CHANGE;
if (DOINGSOFTDEP(fvp))
softdep_change_linkcnt(ip, 0);
if ((error = UFS_UPDATE(ip, !DOINGSOFTDEP(fvp))) != 0) {
VOP_UNLOCK(fvp, 0, p);
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, 0, p);
/* tdvp and tvp locked */
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);
/*
* Compensate for the reference ufs_checkpath() loses.
*/
vref(tdvp);
/* Only tdvp is locked */
if ((error = ufs_checkpath(ip, dp, tcnp->cn_cred)) != 0) {
vrele(tdvp);
goto out;
}
if ((tcnp->cn_flags & SAVESTART) == 0)
panic("ufs_rename: lost to startdir");
if ((error = relookup(tdvp, &tvp, tcnp)) != 0)
goto out;
vrele(tdvp); /* relookup() acquired a reference */
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) DIP(dp, nlink) >= LINK_MAX) {
error = EMLINK;
goto bad;
}
dp->i_effnlink++;
DIP_ADD(dp, nlink, 1);
dp->i_flag |= IN_CHANGE;
if (DOINGSOFTDEP(tdvp))
softdep_change_linkcnt(dp, 0);
if ((error = UFS_UPDATE(dp, !DOINGSOFTDEP(tdvp)))
!= 0) {
dp->i_effnlink--;
DIP_ADD(dp, nlink, -1);
dp->i_flag |= IN_CHANGE;
if (DOINGSOFTDEP(tdvp))
softdep_change_linkcnt(dp, 0);
goto bad;
}
}
ufs_makedirentry(ip, tcnp, &newdir);
if ((error = ufs_direnter(tdvp, NULL, &newdir, tcnp, NULL)) != 0) {
if (doingdirectory && newparent) {
dp->i_effnlink--;
DIP_ADD(dp, nlink, -1);
dp->i_flag |= IN_CHANGE;
if (DOINGSOFTDEP(tdvp))
softdep_change_linkcnt(dp, 0);
(void)UFS_UPDATE(dp, 1);
}
goto bad;
}
VN_KNOTE(tdvp, NOTE_WRITE);
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("ufs_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 ((DIP(dp, mode) & S_ISTXT) && tcnp->cn_cred->cr_uid != 0 &&
tcnp->cn_cred->cr_uid != DIP(dp, uid) &&
DIP(xp, 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 ((DIP(xp, mode) & IFMT) == IFDIR) {
if (xp->i_effnlink > 2 ||
!ufs_dirempty(xp, dp->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 ((error = ufs_dirrewrite(dp, xp, ip->i_number,
IFTODT(DIP(ip, mode)), (doingdirectory && newparent) ?
newparent : doingdirectory)) != 0)
goto bad;
if (doingdirectory) {
if (!newparent) {
dp->i_effnlink--;
if (DOINGSOFTDEP(tdvp))
softdep_change_linkcnt(dp, 0);
}
xp->i_effnlink--;
if (DOINGSOFTDEP(tvp))
softdep_change_linkcnt(xp, 0);
}
if (doingdirectory && !DOINGSOFTDEP(tvp)) {
/*
* Truncate inode. 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) {
DIP_ADD(dp, nlink, -1);
dp->i_flag |= IN_CHANGE;
}
DIP_ADD(xp, nlink, -1);
xp->i_flag |= IN_CHANGE;
if ((error = UFS_TRUNCATE(VTOI(tvp), (off_t)0, IO_SYNC,
tcnp->cn_cred)) != 0)
goto bad;
}
VN_KNOTE(tdvp, NOTE_WRITE);
vput(tdvp);
VN_KNOTE(tvp, NOTE_DELETE);
vput(tvp);
xp = NULL;
}
/*
* 3) Unlink the source.
*/
fcnp->cn_flags &= ~MODMASK;
fcnp->cn_flags |= LOCKPARENT | LOCKLEAF;
if ((fcnp->cn_flags & SAVESTART) == 0)
panic("ufs_rename: lost from startdir");
if ((error = relookup(fdvp, &fvp, fcnp)) != 0) {
vrele(ap->a_fvp);
return (error);
}
vrele(fdvp);
if (fvp == NULL) {
/*
* From name has disappeared.
*/
if (doingdirectory)
panic("ufs_rename: lost dir entry");
vrele(ap->a_fvp);
return (0);
}
xp = VTOI(fvp);
dp = VTOI(fdvp);
/*
* 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; the IN_RENAME
* flag ensures that it cannot be moved by another rename or removed
* by a rmdir.
*/
if (xp != ip) {
if (doingdirectory)
panic("ufs_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) {
xp->i_offset = mastertemplate.dot_reclen;
ufs_dirrewrite(xp, dp, newparent, DT_DIR, 0);
cache_purge(fdvp);
}
error = ufs_dirremove(fdvp, xp, fcnp->cn_flags, 0);
xp->i_flag &= ~IN_RENAME;
}
VN_KNOTE(fvp, NOTE_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:
vrele(fdvp);
if (doingdirectory)
ip->i_flag &= ~IN_RENAME;
if (vn_lock(fvp, LK_EXCLUSIVE, p) == 0) {
ip->i_effnlink--;
DIP_ADD(ip, nlink, -1);
ip->i_flag |= IN_CHANGE;
ip->i_flag &= ~IN_RENAME;
if (DOINGSOFTDEP(fvp))
softdep_change_linkcnt(ip, 0);
vput(fvp);
} else
vrele(fvp);
return (error);
}
/*
* Mkdir system call
*/
int
ufs_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 buf *bp;
struct direct newdir;
struct dirtemplate dirtemplate, *dtp;
int error, dmode, blkoff;
#ifdef DIAGNOSTIC
if ((cnp->cn_flags & HASBUF) == 0)
panic("ufs_mkdir: no name");
#endif
dp = VTOI(dvp);
if ((nlink_t) DIP(dp, 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.
*/
if ((error = UFS_INODE_ALLOC(dp, dmode, cnp->cn_cred, &tvp)) != 0)
goto out;
ip = VTOI(tvp);
DIP_ASSIGN(ip, uid, cnp->cn_cred->cr_uid);
DIP_ASSIGN(ip, gid, DIP(dp, gid));
if ((error = getinoquota(ip)) ||
(error = ufs_quota_alloc_inode(ip, cnp->cn_cred))) {
pool_put(&namei_pool, cnp->cn_pnbuf);
UFS_INODE_FREE(ip, ip->i_number, dmode);
vput(tvp);
vput(dvp);
return (error);
}
ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
DIP_ASSIGN(ip, mode, dmode);
tvp->v_type = VDIR; /* Rest init'd in getnewvnode(). */
ip->i_effnlink = 2;
DIP_ASSIGN(ip, nlink, 2);
if (DOINGSOFTDEP(tvp))
softdep_change_linkcnt(ip, 0);
/*
* Bump link count in parent directory to reflect work done below.
* Should be done before reference is create so cleanup is
* possible if we crash.
*/
dp->i_effnlink++;
DIP_ADD(dp, nlink, 1);
dp->i_flag |= IN_CHANGE;
if (DOINGSOFTDEP(dvp))
softdep_change_linkcnt(dp, 0);
if ((error = UFS_UPDATE(dp, !DOINGSOFTDEP(dvp))) != 0)
goto bad;
/*
* 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_BUF_ALLOC(ip, (off_t)0, DIRBLKSIZ, cnp->cn_cred,
B_CLRBUF, &bp)) != 0)
goto bad;
DIP_ASSIGN(ip, size, DIRBLKSIZ);
ip->i_flag |= IN_CHANGE | IN_UPDATE;
uvm_vnp_setsize(tvp, DIP(ip, 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(ip, !DOINGSOFTDEP(tvp))) != 0) {
(void)VOP_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 (!DOINGSOFTDEP(dvp) && ((error = VOP_BWRITE(bp)) != 0))
goto bad;
ufs_makedirentry(ip, cnp, &newdir);
error = ufs_direnter(dvp, tvp, &newdir, cnp, bp);
bad:
if (error == 0) {
VN_KNOTE(dvp, NOTE_WRITE);
*ap->a_vpp = tvp;
} else {
dp->i_effnlink--;
DIP_ADD(dp, nlink, -1);
dp->i_flag |= IN_CHANGE;
if (DOINGSOFTDEP(dvp))
softdep_change_linkcnt(dp, 0);
/*
* 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;
DIP_ASSIGN(ip, nlink, 0);
ip->i_flag |= IN_CHANGE;
if (DOINGSOFTDEP(tvp))
softdep_change_linkcnt(ip, 0);
vput(tvp);
}
out:
pool_put(&namei_pool, cnp->cn_pnbuf);
vput(dvp);
return (error);
}
/*
* Rmdir system call.
*/
int
ufs_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);
/*
* No rmdir "." or of mounted on directories.
*/
if (dp == ip || vp->v_mountedhere != 0) {
if (dp == ip)
vrele(dvp);
else
vput(dvp);
vput(vp);
return (EINVAL);
}
/*
* 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.
*/
error = 0;
if (ip->i_flag & IN_RENAME) {
error = EINVAL;
goto out;
}
if (ip->i_effnlink != 2 ||
!ufs_dirempty(ip, dp->i_number, cnp->cn_cred)) {
error = ENOTEMPTY;
goto out;
}
if ((DIP(dp, flags) & APPEND) ||
(DIP(ip, flags) & (IMMUTABLE | APPEND))) {
error = EPERM;
goto out;
}
/*
* Delete reference to directory before purging
* inode. If we crash in between, the directory
* will be reattached to lost+found,
*/
dp->i_effnlink--;
ip->i_effnlink--;
if (DOINGSOFTDEP(vp)) {
softdep_change_linkcnt(dp, 0);
softdep_change_linkcnt(ip, 0);
}
if ((error = ufs_dirremove(dvp, ip, cnp->cn_flags, 1)) != 0) {
dp->i_effnlink++;
ip->i_effnlink++;
if (DOINGSOFTDEP(vp)) {
softdep_change_linkcnt(dp, 0);
softdep_change_linkcnt(ip, 0);
}
goto out;
}
VN_KNOTE(dvp, NOTE_WRITE | NOTE_LINK);
cache_purge(dvp);
/*
* Truncate inode. 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)) {
int ioflag;
DIP_ADD(dp, nlink, -1);
dp->i_flag |= IN_CHANGE;
DIP_ADD(ip, nlink, -1);
ip->i_flag |= IN_CHANGE;
ioflag = DOINGASYNC(vp) ? 0 : IO_SYNC;
error = UFS_TRUNCATE(ip, (off_t)0, ioflag, cnp->cn_cred);
}
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:
VN_KNOTE(vp, NOTE_DELETE);
vput(dvp);
vput(vp);
return (error);
}
/*
* symlink -- make a symbolic link
*/
int
ufs_symlink(void *v)
{
struct vop_symlink_args *ap = v;
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);
VN_KNOTE(ap->a_dvp, NOTE_WRITE);
vp = *vpp;
len = strlen(ap->a_target);
if (len < vp->v_mount->mnt_maxsymlinklen) {
ip = VTOI(vp);
bcopy(ap->a_target, (char *)SHORTLINK(ip), len);
DIP_ASSIGN(ip, size, len);
ip->i_flag |= IN_CHANGE | IN_UPDATE;
} else
error = vn_rdwr(UIO_WRITE, vp, ap->a_target, len, (off_t)0,
UIO_SYSSPACE, IO_NODELOCKED, ap->a_cnp->cn_cred, NULL,
(struct proc *)0);
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(void *v)
{
struct vop_readdir_args *ap = v;
struct uio *uio = ap->a_uio;
int error;
size_t count, lost, entries;
off_t off = uio->uio_offset;
count = uio->uio_resid;
entries = (uio->uio_offset + count) & (DIRBLKSIZ - 1);
/* Make sure we don't return partial entries. */
if (count <= entries)
return (EINVAL);
count -= entries;
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;
MALLOC(dirbuf, caddr_t, 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) {
struct dirent *dp, *dpstart;
off_t offstart;
u_long *cookies;
int ncookies;
/*
* Only the NFS server and emulations use cookies, and they
* load the directory block into system space, so we can
* just look at it directly.
*/
if (uio->uio_segflg != UIO_SYSSPACE || uio->uio_iovcnt != 1)
panic("ufs_readdir: lost in space");
dpstart = (struct dirent *)
((char *)uio->uio_iov->iov_base -
(uio->uio_offset - off));
offstart = off;
for (dp = dpstart, ncookies = 0; off < uio->uio_offset; ) {
if (dp->d_reclen == 0)
break;
off += dp->d_reclen;
ncookies++;
dp = (struct dirent *)((caddr_t)dp + dp->d_reclen);
}
lost += uio->uio_offset - off;
uio->uio_offset = off;
MALLOC(cookies, u_long *, ncookies * sizeof(u_long), M_TEMP,
M_WAITOK);
*ap->a_ncookies = ncookies;
*ap->a_cookies = cookies;
for (off = offstart, dp = dpstart; off < uio->uio_offset; ) {
off += dp->d_reclen;
*cookies = off;
cookies++;
dp = (struct dirent *)((caddr_t)dp + dp->d_reclen);
}
}
uio->uio_resid += lost;
*ap->a_eofflag = DIP(VTOI(ap->a_vp), size) <= uio->uio_offset;
return (error);
}
/*
* Return target name of a symbolic link
*/
int
ufs_readlink(void *v)
{
struct vop_readlink_args *ap = v;
struct vnode *vp = ap->a_vp;
struct inode *ip = VTOI(vp);
int isize;
isize = DIP(ip, size);
if (isize < vp->v_mount->mnt_maxsymlinklen ||
(vp->v_mount->mnt_maxsymlinklen == 0 && DIP(ip, blocks) == 0)) {
uiomove((char *)SHORTLINK(ip), isize, ap->a_uio);
return (0);
}
return (VOP_READ(vp, ap->a_uio, 0, ap->a_cred));
}
/*
* Lock an inode. If its already locked, set the WANT bit and sleep.
*/
int
ufs_lock(void *v)
{
struct vop_lock_args *ap = v;
struct vnode *vp = ap->a_vp;
return (lockmgr(&VTOI(vp)->i_lock, ap->a_flags, NULL));
}
/*
* Unlock an inode. If WANT bit is on, wakeup.
*/
int
ufs_unlock(void *v)
{
struct vop_unlock_args *ap = v;
struct vnode *vp = ap->a_vp;
return (lockmgr(&VTOI(vp)->i_lock, ap->a_flags | LK_RELEASE, NULL));
}
/*
* Check for a locked inode.
*/
int
ufs_islocked(void *v)
{
struct vop_islocked_args *ap = v;
return (lockstatus(&VTOI(ap->a_vp)->i_lock));
}
/*
* Calculate the logical to physical mapping if not done already,
* then call the device strategy routine.
*/
int
ufs_strategy(void *v)
{
struct vop_strategy_args *ap = v;
struct buf *bp = ap->a_bp;
struct vnode *vp = bp->b_vp;
struct inode *ip;
int error;
int s;
ip = VTOI(vp);
if (vp->v_type == VBLK || vp->v_type == VCHR)
panic("ufs_strategy: spec");
if (bp->b_blkno == bp->b_lblkno) {
error = VOP_BMAP(vp, bp->b_lblkno, NULL, &bp->b_blkno,
NULL);
if (error) {
bp->b_error = error;
bp->b_flags |= B_ERROR;
s = splbio();
biodone(bp);
splx(s);
return (error);
}
if ((long)bp->b_blkno == -1)
clrbuf(bp);
}
if ((long)bp->b_blkno == -1) {
s = splbio();
biodone(bp);
splx(s);
return (0);
}
vp = ip->i_devvp;
bp->b_dev = vp->v_rdev;
VOCALL (vp->v_op, VOFFSET(vop_strategy), ap);
return (0);
}
/*
* Print out the contents of an inode.
*/
int
ufs_print(void *v)
{
#ifdef DIAGNOSTIC
struct vop_print_args *ap = v;
struct vnode *vp = ap->a_vp;
struct inode *ip = VTOI(vp);
printf("tag VT_UFS, ino %d, on dev %d, %d", ip->i_number,
major(ip->i_dev), minor(ip->i_dev));
printf(" flags 0x%x, effnlink %d, nlink %d\n",
ip->i_flag, ip->i_effnlink, DIP(ip, nlink));
printf("\tmode 0%o, owner %d, group %d, size %lld",
DIP(ip, mode), DIP(ip, uid), DIP(ip, gid), DIP(ip, size));
#ifdef FIFO
if (vp->v_type == VFIFO)
fifo_printinfo(vp);
#endif /* FIFO */
lockmgr_printinfo(&ip->i_lock);
printf("\n");
#endif /* DIAGNOSTIC */
return (0);
}
/*
* Read wrapper for special devices.
*/
int
ufsspec_read(void *v)
{
struct vop_read_args *ap = v;
/*
* Set access flag.
*/
VTOI(ap->a_vp)->i_flag |= IN_ACCESS;
return (VOCALL (spec_vnodeop_p, VOFFSET(vop_read), ap));
}
/*
* Write wrapper for special devices.
*/
int
ufsspec_write(void *v)
{
struct vop_write_args *ap = v;
/*
* Set update and change flags.
*/
VTOI(ap->a_vp)->i_flag |= IN_CHANGE | IN_UPDATE;
return (VOCALL (spec_vnodeop_p, VOFFSET(vop_write), ap));
}
/*
* Close wrapper for special devices.
*
* Update the times on the inode then do device close.
*/
int
ufsspec_close(void *v)
{
struct vop_close_args *ap = v;
struct vnode *vp = ap->a_vp;
struct inode *ip = VTOI(vp);
if (ap->a_vp->v_usecount > 1) {
struct timeval tv;
getmicrotime(&tv);
ITIMES(ip, &tv, &tv);
}
return (VOCALL (spec_vnodeop_p, VOFFSET(vop_close), ap));
}
#ifdef FIFO
/*
* Read wrapper for fifo's
*/
int
ufsfifo_read(void *v)
{
struct vop_read_args *ap = v;
extern int (**fifo_vnodeop_p)(void *);
/*
* Set access flag.
*/
VTOI(ap->a_vp)->i_flag |= IN_ACCESS;
return (VOCALL (fifo_vnodeop_p, VOFFSET(vop_read), ap));
}
/*
* Write wrapper for fifo's.
*/
int
ufsfifo_write(void *v)
{
struct vop_write_args *ap = v;
extern int (**fifo_vnodeop_p)(void *);
/*
* Set update and change flags.
*/
VTOI(ap->a_vp)->i_flag |= IN_CHANGE | IN_UPDATE;
return (VOCALL (fifo_vnodeop_p, VOFFSET(vop_write), ap));
}
/*
* Close wrapper for fifo's.
*
* Update the times on the inode then do device close.
*/
int
ufsfifo_close(void *v)
{
struct vop_close_args *ap = v;
extern int (**fifo_vnodeop_p)(void *);
struct vnode *vp = ap->a_vp;
struct inode *ip = VTOI(vp);
if (ap->a_vp->v_usecount > 1) {
struct timeval tv;
getmicrotime(&tv);
ITIMES(ip, &tv, &tv);
}
return (VOCALL (fifo_vnodeop_p, VOFFSET(vop_close), ap));
}
#endif /* FIFO */
/*
* Return POSIX pathconf information applicable to ufs filesystems.
*/
int
ufs_pathconf(void *v)
{
struct vop_pathconf_args *ap = v;
switch (ap->a_name) {
case _PC_LINK_MAX:
*ap->a_retval = LINK_MAX;
return (0);
case _PC_NAME_MAX:
*ap->a_retval = NAME_MAX;
return (0);
case _PC_PATH_MAX:
*ap->a_retval = PATH_MAX;
return (0);
case _PC_PIPE_BUF:
*ap->a_retval = PIPE_BUF;
return (0);
case _PC_CHOWN_RESTRICTED:
*ap->a_retval = 1;
return (0);
case _PC_NO_TRUNC:
*ap->a_retval = 1;
return (0);
default:
return (EINVAL);
}
/* NOTREACHED */
}
/*
* Advisory record locking support
*/
int
ufs_advlock(void *v)
{
struct vop_advlock_args *ap = v;
struct inode *ip = VTOI(ap->a_vp);
return (lf_advlock(&ip->i_lockf, DIP(ip, size), ap->a_id, ap->a_op,
ap->a_fl, ap->a_flags));
}
/*
* Initialize the vnode associated with a new inode, handle aliased
* vnodes.
*/
int
ufs_vinit(struct mount *mntp, int (**specops)(void *),
int (**fifoops)(void *), struct vnode **vpp)
{
struct inode *ip;
struct vnode *vp, *nvp;
struct timeval mtv;
vp = *vpp;
ip = VTOI(vp);
switch(vp->v_type = IFTOVT(DIP(ip, mode))) {
case VCHR:
case VBLK:
vp->v_op = specops;
if ((nvp = checkalias(vp, DIP(ip, rdev), mntp)) != NULL) {
/*
* Discard unneeded vnode, but save its inode.
* Note that the lock is carried over in the inode
* to the replacement vnode.
*/
nvp->v_data = vp->v_data;
vp->v_data = NULL;
vp->v_op = spec_vnodeop_p;
#ifdef VFSDEBUG
vp->v_flag &= ~VLOCKSWORK;
#endif
vrele(vp);
vgone(vp);
/*
* Reinitialize aliased inode.
*/
vp = nvp;
ip->i_vnode = vp;
}
break;
case VFIFO:
#ifdef FIFO
vp->v_op = fifoops;
break;
#else
return (EOPNOTSUPP);
#endif
case VNON:
case VBAD:
case VSOCK:
case VLNK:
case VDIR:
case VREG:
break;
}
if (ip->i_number == ROOTINO)
vp->v_flag |= VROOT;
/*
* Initialize modrev times
*/
getmicrouptime(&mtv);
SETHIGH(ip->i_modrev, mtv.tv_sec);
SETLOW(ip->i_modrev, mtv.tv_usec * 4294);
*vpp = vp;
return (0);
}
/*
* Allocate a new inode.
*/
int
ufs_makeinode(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 DIAGNOSTIC
if ((cnp->cn_flags & HASBUF) == 0)
panic("ufs_makeinode: no name");
#endif
*vpp = NULL;
if ((mode & IFMT) == 0)
mode |= IFREG;
if ((error = UFS_INODE_ALLOC(pdir, mode, cnp->cn_cred, &tvp)) != 0) {
pool_put(&namei_pool, cnp->cn_pnbuf);
vput(dvp);
return (error);
}
ip = VTOI(tvp);
DIP_ASSIGN(ip, gid, DIP(pdir, gid));
DIP_ASSIGN(ip, uid, cnp->cn_cred->cr_uid);
if ((error = getinoquota(ip)) ||
(error = ufs_quota_alloc_inode(ip, cnp->cn_cred))) {
pool_put(&namei_pool, cnp->cn_pnbuf);
UFS_INODE_FREE(ip, ip->i_number, mode);
vput(tvp);
vput(dvp);
return (error);
}
ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
DIP_ASSIGN(ip, mode, mode);
tvp->v_type = IFTOVT(mode); /* Rest init'd in getnewvnode(). */
ip->i_effnlink = 1;
DIP_ASSIGN(ip, nlink, 1);
if (DOINGSOFTDEP(tvp))
softdep_change_linkcnt(ip, 0);
if ((DIP(ip, mode) & ISGID) &&
!groupmember(DIP(ip, gid), cnp->cn_cred) &&
suser_ucred(cnp->cn_cred))
DIP(ip, mode) &= ~ISGID;
/*
* Make sure inode goes to disk before directory entry.
*/
if ((error = UFS_UPDATE(ip, !DOINGSOFTDEP(tvp))) != 0)
goto bad;
ufs_makedirentry(ip, cnp, &newdir);
if ((error = ufs_direnter(dvp, tvp, &newdir, cnp, NULL)) != 0)
goto bad;
if ((cnp->cn_flags & SAVESTART) == 0)
pool_put(&namei_pool, cnp->cn_pnbuf);
vput(dvp);
*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);
vput(dvp);
ip->i_effnlink = 0;
DIP_ASSIGN(ip, nlink, 0);
ip->i_flag |= IN_CHANGE;
if (DOINGSOFTDEP(tvp))
softdep_change_linkcnt(ip, 0);
tvp->v_type = VNON;
vput(tvp);
return (error);
}
struct filterops ufsread_filtops =
{ 1, NULL, filt_ufsdetach, filt_ufsread };
struct filterops ufswrite_filtops =
{ 1, NULL, filt_ufsdetach, filt_ufswrite };
struct filterops ufsvnode_filtops =
{ 1, NULL, filt_ufsdetach, filt_ufsvnode };
int
ufs_kqfilter(void *v)
{
struct vop_kqfilter_args *ap = v;
struct vnode *vp = ap->a_vp;
struct knote *kn = ap->a_kn;
switch (kn->kn_filter) {
case EVFILT_READ:
kn->kn_fop = &ufsread_filtops;
break;
case EVFILT_WRITE:
kn->kn_fop = &ufswrite_filtops;
break;
case EVFILT_VNODE:
kn->kn_fop = &ufsvnode_filtops;
break;
default:
return (1);
}
kn->kn_hook = (caddr_t)vp;
SLIST_INSERT_HEAD(&vp->v_selectinfo.si_note, kn, kn_selnext);
return (0);
}
void
filt_ufsdetach(struct knote *kn)
{
struct vnode *vp = (struct vnode *)kn->kn_hook;
SLIST_REMOVE(&vp->v_selectinfo.si_note, kn, knote, kn_selnext);
}
/*ARGSUSED*/
int
filt_ufsread(struct knote *kn, long hint)
{
struct vnode *vp = (struct vnode *)kn->kn_hook;
struct inode *ip = VTOI(vp);
/*
* filesystem is gone, so set the EOF flag and schedule
* the knote for deletion.
*/
if (hint == NOTE_REVOKE) {
kn->kn_flags |= (EV_EOF | EV_ONESHOT);
return (1);
}
kn->kn_data = DIP(ip, size) - kn->kn_fp->f_offset;
if (kn->kn_data == 0 && kn->kn_sfflags & NOTE_EOF) {
kn->kn_fflags |= NOTE_EOF;
return (1);
}
return (kn->kn_data != 0);
}
int
filt_ufswrite(struct knote *kn, long hint)
{
/*
* filesystem is gone, so set the EOF flag and schedule
* the knote for deletion.
*/
if (hint == NOTE_REVOKE) {
kn->kn_flags |= (EV_EOF | EV_ONESHOT);
return (1);
}
kn->kn_data = 0;
return (1);
}
int
filt_ufsvnode(struct knote *kn, long hint)
{
if (kn->kn_sfflags & hint)
kn->kn_fflags |= hint;
if (hint == NOTE_REVOKE) {
kn->kn_flags |= EV_EOF;
return (1);
}
return (kn->kn_fflags != 0);
}
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