static int
devfs_vop_nsymlink(struct vop_nsymlink_args *ap)
{
struct devfs_node *dnode = DEVFS_NODE(ap->a_dvp);
struct devfs_node *node;
size_t targetlen;
if (!devfs_node_is_accessible(dnode))
return ENOENT;
ap->a_vap->va_type = VLNK;
if ((dnode->node_type != Nroot) && (dnode->node_type != Ndir))
goto out;
lockmgr(&devfs_lock, LK_EXCLUSIVE);
devfs_allocvp(ap->a_dvp->v_mount, ap->a_vpp, Nlink,
ap->a_nch->ncp->nc_name, dnode, NULL);
targetlen = strlen(ap->a_target);
if (*ap->a_vpp) {
node = DEVFS_NODE(*ap->a_vpp);
node->flags |= DEVFS_USER_CREATED;
node->symlink_namelen = targetlen;
node->symlink_name = kmalloc(targetlen + 1, M_DEVFS, M_WAITOK);
memcpy(node->symlink_name, ap->a_target, targetlen);
node->symlink_name[targetlen] = '\0';
cache_setunresolved(ap->a_nch);
cache_setvp(ap->a_nch, *ap->a_vpp);
}
lockmgr(&devfs_lock, LK_RELEASE);
out:
return ((*ap->a_vpp == NULL) ? ENOTDIR : 0);
}
static int
devfs_vop_nmkdir(struct vop_nmkdir_args *ap)
{
struct devfs_node *dnode = DEVFS_NODE(ap->a_dvp);
struct devfs_node *node;
if (!devfs_node_is_accessible(dnode))
return ENOENT;
if ((dnode->node_type != Nroot) && (dnode->node_type != Ndir))
goto out;
lockmgr(&devfs_lock, LK_EXCLUSIVE);
devfs_allocvp(ap->a_dvp->v_mount, ap->a_vpp, Ndir,
ap->a_nch->ncp->nc_name, dnode, NULL);
if (*ap->a_vpp) {
node = DEVFS_NODE(*ap->a_vpp);
node->flags |= DEVFS_USER_CREATED;
cache_setunresolved(ap->a_nch);
cache_setvp(ap->a_nch, *ap->a_vpp);
}
lockmgr(&devfs_lock, LK_RELEASE);
out:
return ((*ap->a_vpp == NULL) ? ENOTDIR : 0);
}
static int
puffs_vnop_mknod(struct vop_nmknod_args *ap)
{
PUFFS_MSG_VARS(vn, mknod);
struct vnode *dvp = ap->a_dvp;
struct vattr *vap = ap->a_vap;
struct puffs_node *dpn = VPTOPP(dvp);
struct nchandle *nch = ap->a_nch;
struct namecache *ncp = nch->ncp;
struct ucred *cred = ap->a_cred;
struct mount *mp = dvp->v_mount;
struct puffs_mount *pmp = MPTOPUFFSMP(mp);
int error;
if (!EXISTSOP(pmp, MKNOD))
return EOPNOTSUPP;
DPRINTF(("puffs_mknod: dvp %p, name: %s\n",
dvp, ncp->nc_name));
if (vap->va_type != VFIFO)
return EINVAL;
if ((error = vget(dvp, LK_EXCLUSIVE)) != 0) {
DPRINTF(("puffs_vnop_mknod: EAGAIN on ncp %p %s\n",
ncp, ncp->nc_name));
return EAGAIN;
}
PUFFS_MSG_ALLOC(vn, mknod);
puffs_makecn(&mknod_msg->pvnr_cn, &mknod_msg->pvnr_cn_cred,
ncp, cred);
mknod_msg->pvnr_va = *ap->a_vap;
puffs_msg_setinfo(park_mknod, PUFFSOP_VN,
PUFFS_VN_MKNOD, VPTOPNC(dvp));
PUFFS_MSG_ENQUEUEWAIT2(pmp, park_mknod, dvp->v_data, NULL, error);
error = checkerr(pmp, error, __func__);
if (error)
goto out;
error = puffs_newnode(mp, dvp, ap->a_vpp,
mknod_msg->pvnr_newnode, vap->va_type);
if (error)
puffs_abortbutton(pmp, PUFFS_ABORT_MKNOD, dpn->pn_cookie,
mknod_msg->pvnr_newnode, ncp, cred);
out:
vput(dvp);
if (!error) {
cache_setunresolved(nch);
cache_setvp(nch, *ap->a_vpp);
}
PUFFS_MSG_RELEASE(mknod);
return error;
}
static int
puffs_vnop_link(struct vop_nlink_args *ap)
{
PUFFS_MSG_VARS(vn, link);
struct vnode *dvp = ap->a_dvp;
struct vnode *vp = ap->a_vp;
struct puffs_node *dpn = VPTOPP(dvp);
struct puffs_node *pn = VPTOPP(vp);
struct puffs_mount *pmp = MPTOPUFFSMP(dvp->v_mount);
struct nchandle *nch = ap->a_nch;
struct namecache *ncp = nch->ncp;
struct ucred *cred = ap->a_cred;
int error;
if (!EXISTSOP(pmp, LINK))
return EOPNOTSUPP;
if (vp->v_mount != dvp->v_mount)
return EXDEV;
if ((error = vget(dvp, LK_EXCLUSIVE)) != 0) {
DPRINTF(("puffs_vnop_link: EAGAIN on ncp %p %s\n",
ncp, ncp->nc_name));
return EAGAIN;
}
PUFFS_MSG_ALLOC(vn, link);
link_msg->pvnr_cookie_targ = VPTOPNC(vp);
puffs_makecn(&link_msg->pvnr_cn, &link_msg->pvnr_cn_cred,
ncp, cred);
puffs_msg_setinfo(park_link, PUFFSOP_VN,
PUFFS_VN_LINK, VPTOPNC(dvp));
puffs_msg_enqueue(pmp, park_link);
error = puffs_msg_wait2(pmp, park_link, dpn, pn);
PUFFS_MSG_RELEASE(link);
error = checkerr(pmp, error, __func__);
/*
* XXX: stay in touch with the cache. I don't like this, but
* don't have a better solution either. See also puffs_rename().
*/
if (error == 0) {
puffs_updatenode(pn, PUFFS_UPDATECTIME);
}
vput(dvp);
if (error == 0) {
cache_setunresolved(nch);
cache_setvp(nch, vp);
}
return error;
}
static int
puffs_vnop_symlink(struct vop_nsymlink_args *ap)
{
PUFFS_MSG_VARS(vn, symlink);
struct vnode *dvp = ap->a_dvp;
struct puffs_node *dpn = VPTOPP(dvp);
struct mount *mp = dvp->v_mount;
struct puffs_mount *pmp = MPTOPUFFSMP(dvp->v_mount);
struct nchandle *nch = ap->a_nch;
struct namecache *ncp = nch->ncp;
struct ucred *cred = ap->a_cred;
int error;
if (!EXISTSOP(pmp, SYMLINK))
return EOPNOTSUPP;
if ((error = vget(dvp, LK_EXCLUSIVE)) != 0) {
DPRINTF(("puffs_vnop_symlink: EAGAIN on ncp %p %s\n",
ncp, ncp->nc_name));
return EAGAIN;
}
*ap->a_vpp = NULL;
PUFFS_MSG_ALLOC(vn, symlink);
puffs_makecn(&symlink_msg->pvnr_cn, &symlink_msg->pvnr_cn_cred,
ncp, cred);
symlink_msg->pvnr_va = *ap->a_vap;
(void)strlcpy(symlink_msg->pvnr_link, ap->a_target,
sizeof(symlink_msg->pvnr_link));
puffs_msg_setinfo(park_symlink, PUFFSOP_VN,
PUFFS_VN_SYMLINK, VPTOPNC(dvp));
PUFFS_MSG_ENQUEUEWAIT2(pmp, park_symlink, dvp->v_data, NULL, error);
error = checkerr(pmp, error, __func__);
if (error)
goto out;
error = puffs_newnode(mp, dvp, ap->a_vpp,
symlink_msg->pvnr_newnode, VLNK);
if (error)
puffs_abortbutton(pmp, PUFFS_ABORT_SYMLINK, dpn->pn_cookie,
symlink_msg->pvnr_newnode, ncp, cred);
out:
vput(dvp);
PUFFS_MSG_RELEASE(symlink);
if (!error) {
cache_setunresolved(nch);
cache_setvp(nch, *ap->a_vpp);
}
return error;
}
static int
tmpfs_nsymlink(struct vop_nsymlink_args *v)
{
struct vnode *dvp = v->a_dvp;
struct vnode **vpp = v->a_vpp;
struct namecache *ncp = v->a_nch->ncp;
struct vattr *vap = v->a_vap;
struct ucred *cred = v->a_cred;
char *target = v->a_target;
int error;
vap->va_type = VLNK;
error = tmpfs_alloc_file(dvp, vpp, vap, ncp, cred, target);
if (error == 0) {
tmpfs_knote(*vpp, NOTE_WRITE);
cache_setunresolved(v->a_nch);
cache_setvp(v->a_nch, *vpp);
}
return error;
}
static int
tmpfs_ncreate(struct vop_ncreate_args *ap)
{
struct vnode *dvp = ap->a_dvp;
struct vnode **vpp = ap->a_vpp;
struct namecache *ncp = ap->a_nch->ncp;
struct vattr *vap = ap->a_vap;
struct ucred *cred = ap->a_cred;
int error;
KKASSERT(vap->va_type == VREG || vap->va_type == VSOCK);
error = tmpfs_alloc_file(dvp, vpp, vap, ncp, cred, NULL);
if (error == 0) {
cache_setunresolved(ap->a_nch);
cache_setvp(ap->a_nch, *vpp);
tmpfs_knote(dvp, NOTE_WRITE);
}
return (error);
}
static int
tmpfs_nmkdir(struct vop_nmkdir_args *v)
{
struct vnode *dvp = v->a_dvp;
struct vnode **vpp = v->a_vpp;
struct namecache *ncp = v->a_nch->ncp;
struct vattr *vap = v->a_vap;
struct ucred *cred = v->a_cred;
int error;
KKASSERT(vap->va_type == VDIR);
error = tmpfs_alloc_file(dvp, vpp, vap, ncp, cred, NULL);
if (error == 0) {
cache_setunresolved(v->a_nch);
cache_setvp(v->a_nch, *vpp);
tmpfs_knote(dvp, NOTE_WRITE | NOTE_LINK);
}
return error;
}
static int
tmpfs_nmknod(struct vop_nmknod_args *v)
{
struct vnode *dvp = v->a_dvp;
struct vnode **vpp = v->a_vpp;
struct namecache *ncp = v->a_nch->ncp;
struct vattr *vap = v->a_vap;
struct ucred *cred = v->a_cred;
int error;
if (vap->va_type != VBLK && vap->va_type != VCHR &&
vap->va_type != VFIFO) {
return (EINVAL);
}
error = tmpfs_alloc_file(dvp, vpp, vap, ncp, cred, NULL);
if (error == 0) {
cache_setunresolved(v->a_nch);
cache_setvp(v->a_nch, *vpp);
tmpfs_knote(dvp, NOTE_WRITE);
}
return error;
}
static int
tmpfs_nlink(struct vop_nlink_args *v)
{
struct vnode *dvp = v->a_dvp;
struct vnode *vp = v->a_vp;
struct namecache *ncp = v->a_nch->ncp;
struct tmpfs_dirent *de;
struct tmpfs_node *node;
struct tmpfs_node *dnode;
struct mount *mp;
int error;
mp = dvp->v_mount;
KKASSERT(dvp != vp); /* XXX When can this be false? */
node = VP_TO_TMPFS_NODE(vp);
dnode = VP_TO_TMPFS_NODE(dvp);
TMPFS_NODE_LOCK(dnode);
/* XXX: Why aren't the following two tests done by the caller? */
/* Hard links of directories are forbidden. */
if (vp->v_type == VDIR) {
error = EPERM;
goto out;
}
/* Cannot create cross-device links. */
if (dvp->v_mount != vp->v_mount) {
error = EXDEV;
goto out;
}
/* Ensure that we do not overflow the maximum number of links imposed
* by the system. */
KKASSERT(node->tn_links <= LINK_MAX);
if (node->tn_links >= LINK_MAX) {
error = EMLINK;
goto out;
}
/* We cannot create links of files marked immutable or append-only. */
if (node->tn_flags & (IMMUTABLE | APPEND)) {
error = EPERM;
goto out;
}
/* Allocate a new directory entry to represent the node. */
error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node,
ncp->nc_name, ncp->nc_nlen, &de);
if (error != 0)
goto out;
/* Insert the new directory entry into the appropriate directory. */
tmpfs_dir_attach(dnode, de);
/* vp link count has changed, so update node times. */
TMPFS_NODE_LOCK(node);
node->tn_status |= TMPFS_NODE_CHANGED;
TMPFS_NODE_UNLOCK(node);
tmpfs_update(vp);
tmpfs_knote(vp, NOTE_LINK);
cache_setunresolved(v->a_nch);
cache_setvp(v->a_nch, vp);
error = 0;
out:
TMPFS_NODE_UNLOCK(dnode);
if (error == 0)
tmpfs_knote(dvp, NOTE_WRITE);
return error;
}
/*
* vop_compat_nremove { struct nchandle *a_nch, XXX STOPGAP FUNCTION
* struct vnode *a_dvp,
* struct ucred *a_cred }
*/
int
vop_compat_nremove(struct vop_nremove_args *ap)
{
struct thread *td = curthread;
struct componentname cnp;
struct nchandle *nch;
struct namecache *ncp;
struct vnode *dvp;
struct vnode *vp;
int error;
/*
* Sanity checks, get a locked directory vnode.
*/
nch = ap->a_nch; /* locked namecache node */
ncp = nch->ncp;
dvp = ap->a_dvp;
if ((error = vget(dvp, LK_EXCLUSIVE)) != 0) {
kprintf("[diagnostic] vop_compat_resolve: EAGAIN on ncp %p %s\n",
ncp, ncp->nc_name);
return(EAGAIN);
}
/*
* Setup the cnp for a traditional vop_old_lookup() call. The lookup
* caches all information required to delete the entry in the
* directory inode. We expect a return code of 0 for the DELETE
* case (meaning that a vp has been found). The cnp must simulated
* a saved-name situation.
*/
bzero(&cnp, sizeof(cnp));
cnp.cn_nameiop = NAMEI_DELETE;
cnp.cn_flags = CNP_LOCKPARENT;
cnp.cn_nameptr = ncp->nc_name;
cnp.cn_namelen = ncp->nc_nlen;
cnp.cn_cred = ap->a_cred;
cnp.cn_td = td;
/*
* The vnode must be a directory and must not represent the
* current directory.
*/
vp = NULL;
error = vop_old_lookup(ap->a_head.a_ops, dvp, &vp, &cnp);
if (error == 0 && vp->v_type == VDIR)
error = EPERM;
if (error == 0) {
KKASSERT((cnp.cn_flags & CNP_PDIRUNLOCK) == 0);
error = VOP_OLD_REMOVE(dvp, vp, &cnp);
if (error == 0) {
cache_setunresolved(nch);
cache_setvp(nch, NULL);
cache_inval_vp(vp, CINV_DESTROY);
}
}
if (vp) {
if (dvp == vp)
vrele(vp);
else
vput(vp);
}
if ((cnp.cn_flags & CNP_PDIRUNLOCK) == 0)
vn_unlock(dvp);
vrele(dvp);
return (error);
}
/*
* vop_compat_nwhiteout { struct nchandle *a_nch, XXX STOPGAP FUNCTION
* struct vnode *a_dvp,
* struct ucred *a_cred,
* int a_flags }
*
* Issie a whiteout operation (create, lookup, or delete). Compatibility
* requires us to issue the appropriate VOP_OLD_LOOKUP before we issue
* VOP_OLD_WHITEOUT in order to setup the directory inode's i_offset and i_count
* (e.g. in UFS) for the NAMEI_CREATE and NAMEI_DELETE ops. For NAMEI_LOOKUP
* no lookup is necessary.
*/
int
vop_compat_nwhiteout(struct vop_nwhiteout_args *ap)
{
struct thread *td = curthread;
struct componentname cnp;
struct nchandle *nch;
struct namecache *ncp;
struct vnode *dvp;
struct vnode *vp;
int error;
/*
* Sanity checks, get a locked directory vnode.
*/
nch = ap->a_nch; /* locked namecache node */
ncp = nch->ncp;
dvp = ap->a_dvp;
if ((error = vget(dvp, LK_EXCLUSIVE)) != 0) {
kprintf("[diagnostic] vop_compat_resolve: EAGAIN on ncp %p %s\n",
ncp, ncp->nc_name);
return(EAGAIN);
}
/*
* Setup the cnp for a traditional vop_old_lookup() call. The lookup
* caches all information required to create the entry in the
* directory inode. We expect a return code of EJUSTRETURN for
* the CREATE case. The cnp must simulated a saved-name situation.
*/
bzero(&cnp, sizeof(cnp));
cnp.cn_nameiop = ap->a_flags;
cnp.cn_flags = CNP_LOCKPARENT;
cnp.cn_nameptr = ncp->nc_name;
cnp.cn_namelen = ncp->nc_nlen;
cnp.cn_cred = ap->a_cred;
cnp.cn_td = td;
vp = NULL;
/*
* EJUSTRETURN should be returned for the CREATE or DELETE cases.
* The VFS has setup the directory inode for the create. The dvp we
* passed in is expected to remain in a locked state.
*
* If the VOP_OLD_WHITEOUT is successful we are responsible for updating
* the cache state of the locked ncp that was passed to us.
*/
switch(ap->a_flags) {
case NAMEI_DELETE:
cnp.cn_flags |= CNP_DOWHITEOUT;
/* fall through */
case NAMEI_CREATE:
error = vop_old_lookup(ap->a_head.a_ops, dvp, &vp, &cnp);
if (error == EJUSTRETURN) {
KKASSERT((cnp.cn_flags & CNP_PDIRUNLOCK) == 0);
error = VOP_OLD_WHITEOUT(dvp, &cnp, ap->a_flags);
if (error == 0)
cache_setunresolved(nch);
} else {
if (error == 0) {
vput(vp);
vp = NULL;
error = EEXIST;
}
KKASSERT(vp == NULL);
}
break;
case NAMEI_LOOKUP:
error = VOP_OLD_WHITEOUT(dvp, NULL, ap->a_flags);
break;
default:
error = EINVAL;
break;
}
if ((cnp.cn_flags & CNP_PDIRUNLOCK) == 0)
vn_unlock(dvp);
vrele(dvp);
return (error);
}
/*
* vop_compat_nlink { struct nchandle *a_nch, XXX STOPGAP FUNCTION
* struct vnode *a_dvp,
* struct vnode *a_vp,
* struct ucred *a_cred }
*
* The passed vp is locked and represents the source. The passed ncp is
* locked and represents the target to create.
*/
int
vop_compat_nlink(struct vop_nlink_args *ap)
{
struct thread *td = curthread;
struct componentname cnp;
struct nchandle *nch;
struct namecache *ncp;
struct vnode *dvp;
struct vnode *tvp;
int error;
/*
* Sanity checks, get a locked directory vnode.
*/
nch = ap->a_nch; /* locked namecache node */
ncp = nch->ncp;
dvp = ap->a_dvp;
if ((error = vget(dvp, LK_EXCLUSIVE)) != 0) {
kprintf("[diagnostic] vop_compat_resolve: EAGAIN on ncp %p %s\n",
ncp, ncp->nc_name);
return(EAGAIN);
}
/*
* Setup the cnp for a traditional vop_old_lookup() call. The lookup
* caches all information required to create the entry in the
* directory inode. We expect a return code of EJUSTRETURN for
* the CREATE case. The cnp must simulated a saved-name situation.
*/
bzero(&cnp, sizeof(cnp));
cnp.cn_nameiop = NAMEI_CREATE;
cnp.cn_flags = CNP_LOCKPARENT;
cnp.cn_nameptr = ncp->nc_name;
cnp.cn_namelen = ncp->nc_nlen;
cnp.cn_cred = ap->a_cred;
cnp.cn_td = td;
tvp = NULL;
error = vop_old_lookup(ap->a_head.a_ops, dvp, &tvp, &cnp);
/*
* EJUSTRETURN should be returned for this case, which means that
* the VFS has setup the directory inode for the create. The dvp we
* passed in is expected to remain in a locked state.
*
* If the VOP_OLD_LINK is successful we are responsible for updating
* the cache state of the locked ncp that was passed to us.
*/
if (error == EJUSTRETURN) {
KKASSERT((cnp.cn_flags & CNP_PDIRUNLOCK) == 0);
error = VOP_OLD_LINK(dvp, ap->a_vp, &cnp);
if (error == 0) {
cache_setunresolved(nch);
cache_setvp(nch, ap->a_vp);
}
} else {
if (error == 0) {
vput(tvp);
error = EEXIST;
}
}
if ((cnp.cn_flags & CNP_PDIRUNLOCK) == 0)
vn_unlock(dvp);
vrele(dvp);
return (error);
}
/*
* Common code for vnode open operations. Check permissions, and call
* the VOP_NOPEN or VOP_NCREATE routine.
*
* The caller is responsible for setting up nd with nlookup_init() and
* for cleaning it up with nlookup_done(), whether we return an error
* or not.
*
* On success nd->nl_open_vp will hold a referenced and, if requested,
* locked vnode. A locked vnode is requested via NLC_LOCKVP. If fp
* is non-NULL the vnode will be installed in the file pointer.
*
* NOTE: The vnode is referenced just once on return whether or not it
* is also installed in the file pointer.
*/
int
vn_open(struct nlookupdata *nd, struct file *fp, int fmode, int cmode)
{
struct vnode *vp;
struct ucred *cred = nd->nl_cred;
struct vattr vat;
struct vattr *vap = &vat;
int error;
u_int flags;
uint64_t osize;
struct mount *mp;
/*
* Certain combinations are illegal
*/
if ((fmode & (FWRITE | O_TRUNC)) == O_TRUNC)
return(EACCES);
/*
* Lookup the path and create or obtain the vnode. After a
* successful lookup a locked nd->nl_nch will be returned.
*
* The result of this section should be a locked vnode.
*
* XXX with only a little work we should be able to avoid locking
* the vnode if FWRITE, O_CREAT, and O_TRUNC are *not* set.
*/
nd->nl_flags |= NLC_OPEN;
if (fmode & O_APPEND)
nd->nl_flags |= NLC_APPEND;
if (fmode & O_TRUNC)
nd->nl_flags |= NLC_TRUNCATE;
if (fmode & FREAD)
nd->nl_flags |= NLC_READ;
if (fmode & FWRITE)
nd->nl_flags |= NLC_WRITE;
if ((fmode & O_EXCL) == 0 && (fmode & O_NOFOLLOW) == 0)
nd->nl_flags |= NLC_FOLLOW;
if (fmode & O_CREAT) {
/*
* CONDITIONAL CREATE FILE CASE
*
* Setting NLC_CREATE causes a negative hit to store
* the negative hit ncp and not return an error. Then
* nc_error or nc_vp may be checked to see if the ncp
* represents a negative hit. NLC_CREATE also requires
* write permission on the governing directory or EPERM
* is returned.
*/
nd->nl_flags |= NLC_CREATE;
nd->nl_flags |= NLC_REFDVP;
bwillinode(1);
error = nlookup(nd);
} else {
/*
* NORMAL OPEN FILE CASE
*/
error = nlookup(nd);
}
if (error)
return (error);
/*
* split case to allow us to re-resolve and retry the ncp in case
* we get ESTALE.
*/
again:
if (fmode & O_CREAT) {
if (nd->nl_nch.ncp->nc_vp == NULL) {
if ((error = ncp_writechk(&nd->nl_nch)) != 0)
return (error);
VATTR_NULL(vap);
vap->va_type = VREG;
vap->va_mode = cmode;
if (fmode & O_EXCL)
vap->va_vaflags |= VA_EXCLUSIVE;
error = VOP_NCREATE(&nd->nl_nch, nd->nl_dvp, &vp,
nd->nl_cred, vap);
if (error)
return (error);
fmode &= ~O_TRUNC;
/* locked vnode is returned */
} else {
if (fmode & O_EXCL) {
error = EEXIST;
} else {
error = cache_vget(&nd->nl_nch, cred,
LK_EXCLUSIVE, &vp);
}
if (error)
return (error);
fmode &= ~O_CREAT;
}
} else {
error = cache_vget(&nd->nl_nch, cred, LK_EXCLUSIVE, &vp);
if (error)
return (error);
}
/*
* We have a locked vnode and ncp now. Note that the ncp will
* be cleaned up by the caller if nd->nl_nch is left intact.
*/
if (vp->v_type == VLNK) {
error = EMLINK;
goto bad;
}
if (vp->v_type == VSOCK) {
error = EOPNOTSUPP;
goto bad;
}
if ((fmode & O_CREAT) == 0) {
if (fmode & (FWRITE | O_TRUNC)) {
if (vp->v_type == VDIR) {
error = EISDIR;
goto bad;
}
error = vn_writechk(vp, &nd->nl_nch);
if (error) {
/*
* Special stale handling, re-resolve the
* vnode.
*/
if (error == ESTALE) {
vput(vp);
vp = NULL;
cache_setunresolved(&nd->nl_nch);
error = cache_resolve(&nd->nl_nch, cred);
if (error == 0)
goto again;
}
goto bad;
}
}
}
if (fmode & O_TRUNC) {
vn_unlock(vp); /* XXX */
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX */
osize = vp->v_filesize;
VATTR_NULL(vap);
vap->va_size = 0;
error = VOP_SETATTR(vp, vap, cred);
if (error)
goto bad;
error = VOP_GETATTR(vp, vap);
if (error)
goto bad;
mp = vq_vptomp(vp);
VFS_ACCOUNT(mp, vap->va_uid, vap->va_gid, -osize);
}
/*
* Set or clear VNSWAPCACHE on the vp based on nd->nl_nch.ncp->nc_flag.
* These particular bits a tracked all the way from the root.
*
* NOTE: Might not work properly on NFS servers due to the
* disconnected namecache.
*/
flags = nd->nl_nch.ncp->nc_flag;
if ((flags & (NCF_UF_CACHE | NCF_UF_PCACHE)) &&
(flags & (NCF_SF_NOCACHE | NCF_SF_PNOCACHE)) == 0) {
vsetflags(vp, VSWAPCACHE);
} else {
vclrflags(vp, VSWAPCACHE);
}
/*
* Setup the fp so VOP_OPEN can override it. No descriptor has been
* associated with the fp yet so we own it clean.
*
* f_nchandle inherits nl_nch. This used to be necessary only for
* directories but now we do it unconditionally so f*() ops
* such as fchmod() can access the actual namespace that was
* used to open the file.
*/
if (fp) {
if (nd->nl_flags & NLC_APPENDONLY)
fmode |= FAPPENDONLY;
fp->f_nchandle = nd->nl_nch;
cache_zero(&nd->nl_nch);
cache_unlock(&fp->f_nchandle);
}
/*
* Get rid of nl_nch. vn_open does not return it (it returns the
* vnode or the file pointer). Note: we can't leave nl_nch locked
* through the VOP_OPEN anyway since the VOP_OPEN may block, e.g.
* on /dev/ttyd0
*/
if (nd->nl_nch.ncp)
cache_put(&nd->nl_nch);
error = VOP_OPEN(vp, fmode, cred, fp);
if (error) {
/*
* setting f_ops to &badfileops will prevent the descriptor
* code from trying to close and release the vnode, since
* the open failed we do not want to call close.
*/
if (fp) {
fp->f_data = NULL;
fp->f_ops = &badfileops;
}
goto bad;
}
#if 0
/*
* Assert that VREG files have been setup for vmio.
*/
KASSERT(vp->v_type != VREG || vp->v_object != NULL,
("vn_open: regular file was not VMIO enabled!"));
#endif
/*
* Return the vnode. XXX needs some cleaning up. The vnode is
* only returned in the fp == NULL case.
*/
if (fp == NULL) {
nd->nl_open_vp = vp;
nd->nl_vp_fmode = fmode;
if ((nd->nl_flags & NLC_LOCKVP) == 0)
vn_unlock(vp);
} else {
vput(vp);
}
return (0);
bad:
if (vp)
vput(vp);
return (error);
}
static int
tmpfs_nremove(struct vop_nremove_args *v)
{
struct vnode *dvp = v->a_dvp;
struct namecache *ncp = v->a_nch->ncp;
struct vnode *vp;
int error;
struct tmpfs_dirent *de;
struct tmpfs_mount *tmp;
struct tmpfs_node *dnode;
struct tmpfs_node *node;
/*
* We have to acquire the vp from v->a_nch because we will likely
* unresolve the namecache entry, and a vrele/vput is needed to
* trigger the tmpfs_inactive/tmpfs_reclaim sequence.
*
* We have to use vget to clear any inactive state on the vnode,
* otherwise the vnode may remain inactive and thus tmpfs_inactive
* will not get called when we release it.
*/
error = cache_vget(v->a_nch, v->a_cred, LK_SHARED, &vp);
KKASSERT(error == 0);
vn_unlock(vp);
if (vp->v_type == VDIR) {
error = EISDIR;
goto out;
}
dnode = VP_TO_TMPFS_DIR(dvp);
node = VP_TO_TMPFS_NODE(vp);
tmp = VFS_TO_TMPFS(vp->v_mount);
de = tmpfs_dir_lookup(dnode, node, ncp);
if (de == NULL) {
error = ENOENT;
goto out;
}
/* Files marked as immutable or append-only cannot be deleted. */
if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) ||
(dnode->tn_flags & APPEND)) {
error = EPERM;
goto out;
}
/* Remove the entry from the directory; as it is a file, we do not
* have to change the number of hard links of the directory. */
tmpfs_dir_detach(dnode, de);
/* Free the directory entry we just deleted. Note that the node
* referred by it will not be removed until the vnode is really
* reclaimed. */
tmpfs_free_dirent(tmp, de);
if (node->tn_links > 0) {
TMPFS_NODE_LOCK(node);
node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \
TMPFS_NODE_MODIFIED;
TMPFS_NODE_UNLOCK(node);
}
cache_setunresolved(v->a_nch);
cache_setvp(v->a_nch, NULL);
tmpfs_knote(vp, NOTE_DELETE);
/*cache_inval_vp(vp, CINV_DESTROY);*/
tmpfs_knote(dvp, NOTE_WRITE);
error = 0;
out:
vrele(vp);
return error;
}
static int
tmpfs_nrmdir(struct vop_nrmdir_args *v)
{
struct vnode *dvp = v->a_dvp;
struct namecache *ncp = v->a_nch->ncp;
struct vnode *vp;
struct tmpfs_dirent *de;
struct tmpfs_mount *tmp;
struct tmpfs_node *dnode;
struct tmpfs_node *node;
int error;
/*
* We have to acquire the vp from v->a_nch because we will likely
* unresolve the namecache entry, and a vrele/vput is needed to
* trigger the tmpfs_inactive/tmpfs_reclaim sequence.
*
* We have to use vget to clear any inactive state on the vnode,
* otherwise the vnode may remain inactive and thus tmpfs_inactive
* will not get called when we release it.
*/
error = cache_vget(v->a_nch, v->a_cred, LK_SHARED, &vp);
KKASSERT(error == 0);
vn_unlock(vp);
/*
* Prevalidate so we don't hit an assertion later
*/
if (vp->v_type != VDIR) {
error = ENOTDIR;
goto out;
}
tmp = VFS_TO_TMPFS(dvp->v_mount);
dnode = VP_TO_TMPFS_DIR(dvp);
node = VP_TO_TMPFS_DIR(vp);
/* Directories with more than two entries ('.' and '..') cannot be
* removed. */
if (node->tn_size > 0) {
error = ENOTEMPTY;
goto out;
}
if ((dnode->tn_flags & APPEND)
|| (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) {
error = EPERM;
goto out;
}
/* This invariant holds only if we are not trying to remove "..".
* We checked for that above so this is safe now. */
KKASSERT(node->tn_dir.tn_parent == dnode);
/* Get the directory entry associated with node (vp). This was
* filled by tmpfs_lookup while looking up the entry. */
de = tmpfs_dir_lookup(dnode, node, ncp);
KKASSERT(TMPFS_DIRENT_MATCHES(de,
ncp->nc_name,
ncp->nc_nlen));
/* Check flags to see if we are allowed to remove the directory. */
if ((dnode->tn_flags & APPEND) ||
node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) {
error = EPERM;
goto out;
}
/* Detach the directory entry from the directory (dnode). */
tmpfs_dir_detach(dnode, de);
/* No vnode should be allocated for this entry from this point */
TMPFS_NODE_LOCK(node);
TMPFS_ASSERT_ELOCKED(node);
TMPFS_NODE_LOCK(dnode);
TMPFS_ASSERT_ELOCKED(dnode);
#if 0
/* handled by tmpfs_free_node */
KKASSERT(node->tn_links > 0);
node->tn_links--;
node->tn_dir.tn_parent = NULL;
#endif
node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \
TMPFS_NODE_MODIFIED;
#if 0
/* handled by tmpfs_free_node */
KKASSERT(dnode->tn_links > 0);
dnode->tn_links--;
#endif
dnode->tn_status |= TMPFS_NODE_ACCESSED | \
TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED;
TMPFS_NODE_UNLOCK(dnode);
TMPFS_NODE_UNLOCK(node);
/* Free the directory entry we just deleted. Note that the node
* referred by it will not be removed until the vnode is really
* reclaimed. */
tmpfs_free_dirent(tmp, de);
/* Release the deleted vnode (will destroy the node, notify
* interested parties and clean it from the cache). */
TMPFS_NODE_LOCK(dnode);
dnode->tn_status |= TMPFS_NODE_CHANGED;
TMPFS_NODE_UNLOCK(dnode);
tmpfs_update(dvp);
cache_setunresolved(v->a_nch);
cache_setvp(v->a_nch, NULL);
/*cache_inval_vp(vp, CINV_DESTROY);*/
tmpfs_knote(dvp, NOTE_WRITE | NOTE_LINK);
error = 0;
out:
vrele(vp);
return error;
}
