static int
tmpfs_nresolve(struct vop_nresolve_args *v)
{
struct vnode *dvp = v->a_dvp;
struct vnode *vp = NULL;
struct namecache *ncp = v->a_nch->ncp;
struct tmpfs_node *tnode;
struct mount *mp;
struct tmpfs_dirent *de;
struct tmpfs_node *dnode;
int error;
mp = dvp->v_mount;
dnode = VP_TO_TMPFS_DIR(dvp);
TMPFS_NODE_LOCK_SH(dnode);
de = tmpfs_dir_lookup(dnode, NULL, ncp);
if (de == NULL) {
error = ENOENT;
} else {
/*
* Allocate a vnode for the node we found.
*/
tnode = de->td_node;
error = tmpfs_alloc_vp(dvp->v_mount, tnode,
LK_EXCLUSIVE | LK_RETRY, &vp);
if (error)
goto out;
KKASSERT(vp);
}
out:
TMPFS_NODE_UNLOCK(dnode);
if ((dnode->tn_status & TMPFS_NODE_ACCESSED) == 0) {
TMPFS_NODE_LOCK(dnode);
dnode->tn_status |= TMPFS_NODE_ACCESSED;
TMPFS_NODE_UNLOCK(dnode);
}
/*
* Store the result of this lookup in the cache. Avoid this if the
* request was for creation, as it does not improve timings on
* emprical tests.
*/
if (vp) {
vn_unlock(vp);
cache_setvp(v->a_nch, vp);
vrele(vp);
} else if (error == ENOENT) {
cache_setvp(v->a_nch, NULL);
}
return (error);
}
static int
tmpfs_readdir(struct vop_readdir_args *v)
{
struct vnode *vp = v->a_vp;
struct uio *uio = v->a_uio;
int *eofflag = v->a_eofflag;
u_long **cookies = v->a_cookies;
int *ncookies = v->a_ncookies;
int error;
ssize_t startresid;
int maxcookies;
struct tmpfs_node *node;
/* This operation only makes sense on directory nodes. */
if (vp->v_type != VDIR)
return ENOTDIR;
maxcookies = 0;
node = VP_TO_TMPFS_DIR(vp);
startresid = uio->uio_resid;
/* Allocate cookies for NFS and compat modules. */
if (cookies != NULL && ncookies != NULL) {
maxcookies = howmany(node->tn_size,
sizeof(struct tmpfs_dirent)) + 2;
*cookies = malloc(maxcookies * sizeof(**cookies), M_TEMP,
M_WAITOK);
*ncookies = 0;
}
if (cookies == NULL)
error = tmpfs_dir_getdents(node, uio, 0, NULL, NULL);
else
error = tmpfs_dir_getdents(node, uio, maxcookies, *cookies,
ncookies);
/* Buffer was filled without hitting EOF. */
if (error == EJUSTRETURN)
error = (uio->uio_resid != startresid) ? 0 : EINVAL;
if (error != 0 && cookies != NULL && ncookies != NULL) {
free(*cookies, M_TEMP);
*cookies = NULL;
*ncookies = 0;
}
if (eofflag != NULL)
*eofflag =
(error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF);
return error;
}
static int
tmpfs_remove(struct vop_remove_args *v)
{
struct vnode *dvp = v->a_dvp;
struct vnode *vp = v->a_vp;
int error;
struct tmpfs_dirent *de;
struct tmpfs_mount *tmp;
struct tmpfs_node *dnode;
struct tmpfs_node *node;
MPASS(VOP_ISLOCKED(dvp));
MPASS(VOP_ISLOCKED(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, v->a_cnp);
MPASS(de != NULL);
/* 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(dvp, de);
if (v->a_cnp->cn_flags & DOWHITEOUT)
tmpfs_dir_whiteout_add(dvp, v->a_cnp);
/* 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, TRUE);
node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED;
error = 0;
out:
return error;
}
static int
tmpfs_readdir(struct vop_readdir_args *v)
{
struct vnode *vp = v->a_vp;
struct uio *uio = v->a_uio;
int *eofflag = v->a_eofflag;
u_long **cookies = v->a_cookies;
int *ncookies = v->a_ncookies;
int error;
ssize_t startresid;
int cnt = 0;
struct tmpfs_node *node;
/* This operation only makes sense on directory nodes. */
if (vp->v_type != VDIR)
return ENOTDIR;
node = VP_TO_TMPFS_DIR(vp);
startresid = uio->uio_resid;
if (cookies != NULL && ncookies != NULL) {
cnt = howmany(node->tn_size, sizeof(struct tmpfs_dirent)) + 2;
*cookies = malloc(cnt * sizeof(**cookies), M_TEMP, M_WAITOK);
*ncookies = 0;
}
if (cnt == 0)
error = tmpfs_dir_getdents(node, uio, 0, NULL, NULL);
else
error = tmpfs_dir_getdents(node, uio, cnt, *cookies, ncookies);
if (error == EJUSTRETURN)
error = (uio->uio_resid != startresid) ? 0 : EINVAL;
if (error != 0 && cnt != 0)
free(*cookies, M_TEMP);
if (eofflag != NULL)
*eofflag =
(error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF);
return error;
}
static int
tmpfs_whiteout(struct vop_whiteout_args *ap)
{
struct vnode *dvp = ap->a_dvp;
struct componentname *cnp = ap->a_cnp;
struct tmpfs_dirent *de;
switch (ap->a_flags) {
case LOOKUP:
return (0);
case CREATE:
de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(dvp), NULL, cnp);
if (de != NULL)
return (de->td_node == NULL ? 0 : EEXIST);
return (tmpfs_dir_whiteout_add(dvp, cnp));
case DELETE:
tmpfs_dir_whiteout_remove(dvp, cnp);
return (0);
default:
panic("tmpfs_whiteout: unknown op");
}
}
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;
struct mount *mp;
mp = dvp->v_mount;
/*
* 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(vp->v_mount == dvp->v_mount);
KKASSERT(error == 0);
vn_unlock(vp);
if (vp->v_type == VDIR) {
error = EISDIR;
goto out2;
}
dnode = VP_TO_TMPFS_DIR(dvp);
node = VP_TO_TMPFS_NODE(vp);
tmp = VFS_TO_TMPFS(vp->v_mount);
TMPFS_NODE_LOCK(dnode);
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_unlink(v->a_nch);
tmpfs_knote(vp, NOTE_DELETE);
error = 0;
out:
TMPFS_NODE_UNLOCK(dnode);
if (error == 0)
tmpfs_knote(dvp, NOTE_WRITE);
out2:
vrele(vp);
return error;
}
static int
tmpfs_readdir(struct vop_readdir_args *v)
{
struct vnode *vp = v->a_vp;
struct uio *uio = v->a_uio;
int *eofflag = v->a_eofflag;
off_t **cookies = v->a_cookies;
int *ncookies = v->a_ncookies;
struct tmpfs_mount *tmp;
int error;
off_t startoff;
off_t cnt = 0;
struct tmpfs_node *node;
/* This operation only makes sense on directory nodes. */
if (vp->v_type != VDIR) {
return ENOTDIR;
}
tmp = VFS_TO_TMPFS(vp->v_mount);
node = VP_TO_TMPFS_DIR(vp);
startoff = uio->uio_offset;
if (uio->uio_offset == TMPFS_DIRCOOKIE_DOT) {
error = tmpfs_dir_getdotdent(node, uio);
if (error != 0) {
TMPFS_NODE_LOCK_SH(node);
goto outok;
}
cnt++;
}
if (uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT) {
/* may lock parent, cannot hold node lock */
error = tmpfs_dir_getdotdotdent(tmp, node, uio);
if (error != 0) {
TMPFS_NODE_LOCK_SH(node);
goto outok;
}
cnt++;
}
TMPFS_NODE_LOCK_SH(node);
error = tmpfs_dir_getdents(node, uio, &cnt);
outok:
KKASSERT(error >= -1);
if (error == -1)
error = 0;
if (eofflag != NULL)
*eofflag =
(error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF);
/* Update NFS-related variables. */
if (error == 0 && cookies != NULL && ncookies != NULL) {
off_t i;
off_t off = startoff;
struct tmpfs_dirent *de = NULL;
*ncookies = cnt;
*cookies = kmalloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK);
for (i = 0; i < cnt; i++) {
KKASSERT(off != TMPFS_DIRCOOKIE_EOF);
if (off == TMPFS_DIRCOOKIE_DOT) {
off = TMPFS_DIRCOOKIE_DOTDOT;
} else {
if (off == TMPFS_DIRCOOKIE_DOTDOT) {
de = RB_MIN(tmpfs_dirtree_cookie,
&node->tn_dir.tn_cookietree);
} else if (de != NULL) {
de = RB_NEXT(tmpfs_dirtree_cookie,
&node->tn_dir.tn_cookietree, de);
} else {
de = tmpfs_dir_lookupbycookie(node,
off);
KKASSERT(de != NULL);
de = RB_NEXT(tmpfs_dirtree_cookie,
&node->tn_dir.tn_cookietree, de);
}
if (de == NULL)
off = TMPFS_DIRCOOKIE_EOF;
else
off = tmpfs_dircookie(de);
}
(*cookies)[i] = off;
}
KKASSERT(uio->uio_offset == off);
}
TMPFS_NODE_UNLOCK(node);
if ((node->tn_status & TMPFS_NODE_ACCESSED) == 0) {
TMPFS_NODE_LOCK(node);
node->tn_status |= TMPFS_NODE_ACCESSED;
TMPFS_NODE_UNLOCK(node);
}
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;
struct mount *mp;
int error;
mp = dvp->v_mount;
/*
* 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.
*/
TMPFS_NODE_LOCK(dnode);
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;
TMPFS_NODE_UNLOCK(dnode);
goto out;
}
/* Detach the directory entry from the directory (dnode). */
tmpfs_dir_detach(dnode, de);
TMPFS_NODE_UNLOCK(dnode);
/* No vnode should be allocated for this entry from this point */
TMPFS_NODE_LOCK(dnode);
TMPFS_ASSERT_ELOCKED(dnode);
TMPFS_NODE_LOCK(node);
TMPFS_ASSERT_ELOCKED(node);
/*
* Must set parent linkage to NULL (tested by ncreate to disallow
* the creation of new files/dirs in a deleted directory)
*/
node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED |
TMPFS_NODE_MODIFIED;
dnode->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED |
TMPFS_NODE_MODIFIED;
TMPFS_NODE_UNLOCK(node);
TMPFS_NODE_UNLOCK(dnode);
/* 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_unlink(v->a_nch);
tmpfs_knote(dvp, NOTE_WRITE | NOTE_LINK);
error = 0;
out:
vrele(vp);
return error;
}
static int
tmpfs_nrename(struct vop_nrename_args *v)
{
struct vnode *fdvp = v->a_fdvp;
struct namecache *fncp = v->a_fnch->ncp;
struct vnode *fvp = fncp->nc_vp;
struct vnode *tdvp = v->a_tdvp;
struct namecache *tncp = v->a_tnch->ncp;
struct vnode *tvp;
struct tmpfs_dirent *de, *tde;
struct tmpfs_mount *tmp;
struct tmpfs_node *fdnode;
struct tmpfs_node *fnode;
struct tmpfs_node *tnode;
struct tmpfs_node *tdnode;
struct mount *mp;
char *newname;
char *oldname;
int error;
mp = fdvp->v_mount;
KKASSERT(fdvp->v_mount == fvp->v_mount);
/*
* Because tvp can get overwritten we have to vget it instead of
* just vref or use it, otherwise it's VINACTIVE flag may not get
* cleared and the node won't get destroyed.
*/
error = cache_vget(v->a_tnch, v->a_cred, LK_SHARED, &tvp);
if (error == 0) {
tnode = VP_TO_TMPFS_NODE(tvp);
vn_unlock(tvp);
} else {
tnode = NULL;
}
/* Disallow cross-device renames.
* XXX Why isn't this done by the caller? */
if (fvp->v_mount != tdvp->v_mount ||
(tvp != NULL && fvp->v_mount != tvp->v_mount)) {
error = EXDEV;
goto out;
}
tmp = VFS_TO_TMPFS(tdvp->v_mount);
tdnode = VP_TO_TMPFS_DIR(tdvp);
/* If source and target are the same file, there is nothing to do. */
if (fvp == tvp) {
error = 0;
goto out;
}
fdnode = VP_TO_TMPFS_DIR(fdvp);
fnode = VP_TO_TMPFS_NODE(fvp);
TMPFS_NODE_LOCK(fdnode);
de = tmpfs_dir_lookup(fdnode, fnode, fncp);
TMPFS_NODE_UNLOCK(fdnode); /* XXX depend on namecache lock */
/* Avoid manipulating '.' and '..' entries. */
if (de == NULL) {
error = ENOENT;
goto out_locked;
}
KKASSERT(de->td_node == fnode);
/*
* If replacing an entry in the target directory and that entry
* is a directory, it must be empty.
*
* Kern_rename gurantees the destination to be a directory
* if the source is one (it does?).
*/
if (tvp != NULL) {
KKASSERT(tnode != NULL);
if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
(tdnode->tn_flags & (APPEND | IMMUTABLE))) {
error = EPERM;
goto out_locked;
}
if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) {
if (tnode->tn_size > 0) {
error = ENOTEMPTY;
goto out_locked;
}
} else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) {
error = ENOTDIR;
goto out_locked;
} else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) {
error = EISDIR;
goto out_locked;
} else {
KKASSERT(fnode->tn_type != VDIR &&
tnode->tn_type != VDIR);
}
}
if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
(fdnode->tn_flags & (APPEND | IMMUTABLE))) {
error = EPERM;
goto out_locked;
}
/*
* Ensure that we have enough memory to hold the new name, if it
* has to be changed.
*/
if (fncp->nc_nlen != tncp->nc_nlen ||
bcmp(fncp->nc_name, tncp->nc_name, fncp->nc_nlen) != 0) {
newname = kmalloc(tncp->nc_nlen + 1, tmp->tm_name_zone,
M_WAITOK | M_NULLOK);
if (newname == NULL) {
error = ENOSPC;
goto out_locked;
}
bcopy(tncp->nc_name, newname, tncp->nc_nlen);
newname[tncp->nc_nlen] = '\0';
} else {
newname = NULL;
}
/*
* Unlink entry from source directory. Note that the kernel has
* already checked for illegal recursion cases (renaming a directory
* into a subdirectory of itself).
*/
if (fdnode != tdnode) {
tmpfs_dir_detach(fdnode, de);
} else {
/* XXX depend on namecache lock */
TMPFS_NODE_LOCK(fdnode);
KKASSERT(de == tmpfs_dir_lookup(fdnode, fnode, fncp));
RB_REMOVE(tmpfs_dirtree, &fdnode->tn_dir.tn_dirtree, de);
RB_REMOVE(tmpfs_dirtree_cookie,
&fdnode->tn_dir.tn_cookietree, de);
TMPFS_NODE_UNLOCK(fdnode);
}
/*
* Handle any name change. Swap with newname, we will
* deallocate it at the end.
*/
if (newname != NULL) {
#if 0
TMPFS_NODE_LOCK(fnode);
fnode->tn_status |= TMPFS_NODE_CHANGED;
TMPFS_NODE_UNLOCK(fnode);
#endif
oldname = de->td_name;
de->td_name = newname;
de->td_namelen = (uint16_t)tncp->nc_nlen;
newname = oldname;
}
/*
* If we are overwriting an entry, we have to remove the old one
* from the target directory.
*/
if (tvp != NULL) {
/* Remove the old entry from the target directory. */
TMPFS_NODE_LOCK(tdnode);
tde = tmpfs_dir_lookup(tdnode, tnode, tncp);
tmpfs_dir_detach(tdnode, tde);
TMPFS_NODE_UNLOCK(tdnode);
tmpfs_knote(tdnode->tn_vnode, NOTE_DELETE);
/*
* 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(VFS_TO_TMPFS(tvp->v_mount), tde);
/*cache_inval_vp(tvp, CINV_DESTROY);*/
}
/*
* Link entry to target directory. If the entry
* represents a directory move the parent linkage
* as well.
*/
if (fdnode != tdnode) {
if (de->td_node->tn_type == VDIR) {
TMPFS_VALIDATE_DIR(fnode);
}
tmpfs_dir_attach(tdnode, de);
} else {
TMPFS_NODE_LOCK(tdnode);
tdnode->tn_status |= TMPFS_NODE_MODIFIED;
RB_INSERT(tmpfs_dirtree, &tdnode->tn_dir.tn_dirtree, de);
RB_INSERT(tmpfs_dirtree_cookie,
&tdnode->tn_dir.tn_cookietree, de);
TMPFS_NODE_UNLOCK(tdnode);
}
/*
* Finish up
*/
if (newname) {
kfree(newname, tmp->tm_name_zone);
newname = NULL;
}
cache_rename(v->a_fnch, v->a_tnch);
tmpfs_knote(v->a_fdvp, NOTE_WRITE);
tmpfs_knote(v->a_tdvp, NOTE_WRITE);
if (fnode->tn_vnode)
tmpfs_knote(fnode->tn_vnode, NOTE_RENAME);
error = 0;
out_locked:
;
out:
if (tvp)
vrele(tvp);
return error;
}
static int
tmpfs_rename(struct vop_rename_args *v)
{
struct vnode *fdvp = v->a_fdvp;
struct vnode *fvp = v->a_fvp;
struct componentname *fcnp = v->a_fcnp;
struct vnode *tdvp = v->a_tdvp;
struct vnode *tvp = v->a_tvp;
struct componentname *tcnp = v->a_tcnp;
char *newname;
int error;
struct tmpfs_dirent *de;
struct tmpfs_mount *tmp;
struct tmpfs_node *fdnode;
struct tmpfs_node *fnode;
struct tmpfs_node *tnode;
struct tmpfs_node *tdnode;
MPASS(VOP_ISLOCKED(tdvp));
MPASS(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp)));
MPASS(fcnp->cn_flags & HASBUF);
MPASS(tcnp->cn_flags & HASBUF);
tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp);
/* Disallow cross-device renames.
* XXX Why isn't this done by the caller? */
if (fvp->v_mount != tdvp->v_mount ||
(tvp != NULL && fvp->v_mount != tvp->v_mount)) {
error = EXDEV;
goto out;
}
tmp = VFS_TO_TMPFS(tdvp->v_mount);
tdnode = VP_TO_TMPFS_DIR(tdvp);
/* If source and target are the same file, there is nothing to do. */
if (fvp == tvp) {
error = 0;
goto out;
}
/* If we need to move the directory between entries, lock the
* source so that we can safely operate on it. */
if (fdvp != tdvp && fdvp != tvp)
vn_lock(fdvp, LK_EXCLUSIVE | LK_RETRY);
fdnode = VP_TO_TMPFS_DIR(fdvp);
fnode = VP_TO_TMPFS_NODE(fvp);
de = tmpfs_dir_lookup(fdnode, fnode, fcnp);
/* Entry can disappear before we lock fdvp,
* also avoid manipulating '.' and '..' entries. */
if (de == NULL) {
if ((fcnp->cn_flags & ISDOTDOT) != 0 ||
(fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.'))
error = EINVAL;
else
error = ENOENT;
goto out_locked;
}
MPASS(de->td_node == fnode);
/* If re-naming a directory to another preexisting directory
* ensure that the target directory is empty so that its
* removal causes no side effects.
* Kern_rename gurantees the destination to be a directory
* if the source is one. */
if (tvp != NULL) {
MPASS(tnode != NULL);
if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
(tdnode->tn_flags & (APPEND | IMMUTABLE))) {
error = EPERM;
goto out_locked;
}
if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) {
if (tnode->tn_size > 0) {
error = ENOTEMPTY;
goto out_locked;
}
} else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) {
error = ENOTDIR;
goto out_locked;
} else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) {
error = EISDIR;
goto out_locked;
} else {
MPASS(fnode->tn_type != VDIR &&
tnode->tn_type != VDIR);
}
}
if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))
|| (fdnode->tn_flags & (APPEND | IMMUTABLE))) {
error = EPERM;
goto out_locked;
}
/* Ensure that we have enough memory to hold the new name, if it
* has to be changed. */
if (fcnp->cn_namelen != tcnp->cn_namelen ||
bcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) {
newname = malloc(tcnp->cn_namelen, M_TMPFSNAME, M_WAITOK);
} else
newname = NULL;
/* If the node is being moved to another directory, we have to do
* the move. */
if (fdnode != tdnode) {
/* In case we are moving a directory, we have to adjust its
* parent to point to the new parent. */
if (de->td_node->tn_type == VDIR) {
struct tmpfs_node *n;
/* Ensure the target directory is not a child of the
* directory being moved. Otherwise, we'd end up
* with stale nodes. */
n = tdnode;
/* TMPFS_LOCK garanties that no nodes are freed while
* traversing the list. Nodes can only be marked as
* removed: tn_parent == NULL. */
TMPFS_LOCK(tmp);
TMPFS_NODE_LOCK(n);
while (n != n->tn_dir.tn_parent) {
struct tmpfs_node *parent;
if (n == fnode) {
TMPFS_NODE_UNLOCK(n);
TMPFS_UNLOCK(tmp);
error = EINVAL;
if (newname != NULL)
free(newname, M_TMPFSNAME);
goto out_locked;
}
parent = n->tn_dir.tn_parent;
TMPFS_NODE_UNLOCK(n);
if (parent == NULL) {
n = NULL;
break;
}
TMPFS_NODE_LOCK(parent);
if (parent->tn_dir.tn_parent == NULL) {
TMPFS_NODE_UNLOCK(parent);
n = NULL;
break;
}
n = parent;
}
TMPFS_UNLOCK(tmp);
if (n == NULL) {
error = EINVAL;
if (newname != NULL)
free(newname, M_TMPFSNAME);
goto out_locked;
}
TMPFS_NODE_UNLOCK(n);
/* Adjust the parent pointer. */
TMPFS_VALIDATE_DIR(fnode);
TMPFS_NODE_LOCK(de->td_node);
de->td_node->tn_dir.tn_parent = tdnode;
TMPFS_NODE_UNLOCK(de->td_node);
/* As a result of changing the target of the '..'
* entry, the link count of the source and target
* directories has to be adjusted. */
TMPFS_NODE_LOCK(tdnode);
TMPFS_ASSERT_LOCKED(tdnode);
tdnode->tn_links++;
TMPFS_NODE_UNLOCK(tdnode);
TMPFS_NODE_LOCK(fdnode);
TMPFS_ASSERT_LOCKED(fdnode);
fdnode->tn_links--;
TMPFS_NODE_UNLOCK(fdnode);
}
/* Do the move: just remove the entry from the source directory
* and insert it into the target one. */
tmpfs_dir_detach(fdvp, de);
if (fcnp->cn_flags & DOWHITEOUT)
tmpfs_dir_whiteout_add(fdvp, fcnp);
if (tcnp->cn_flags & ISWHITEOUT)
tmpfs_dir_whiteout_remove(tdvp, tcnp);
tmpfs_dir_attach(tdvp, de);
}
/* If the name has changed, we need to make it effective by changing
* it in the directory entry. */
if (newname != NULL) {
MPASS(tcnp->cn_namelen <= MAXNAMLEN);
free(de->td_name, M_TMPFSNAME);
de->td_namelen = (uint16_t)tcnp->cn_namelen;
memcpy(newname, tcnp->cn_nameptr, tcnp->cn_namelen);
de->td_name = newname;
fnode->tn_status |= TMPFS_NODE_CHANGED;
tdnode->tn_status |= TMPFS_NODE_MODIFIED;
}
/* If we are overwriting an entry, we have to remove the old one
* from the target directory. */
if (tvp != NULL) {
/* Remove the old entry from the target directory. */
de = tmpfs_dir_lookup(tdnode, tnode, tcnp);
tmpfs_dir_detach(tdvp, 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(VFS_TO_TMPFS(tvp->v_mount), de, TRUE);
}
cache_purge(fvp);
error = 0;
out_locked:
if (fdvp != tdvp && fdvp != tvp)
VOP_UNLOCK(fdvp, 0);
out:
/* Release target nodes. */
/* XXX: I don't understand when tdvp can be the same as tvp, but
* other code takes care of this... */
if (tdvp == tvp)
vrele(tdvp);
else
vput(tdvp);
if (tvp != NULL)
vput(tvp);
/* Release source nodes. */
vrele(fdvp);
vrele(fvp);
return error;
}
static int
tmpfs_lookup(struct vop_cachedlookup_args *v)
{
struct vnode *dvp = v->a_dvp;
struct vnode **vpp = v->a_vpp;
struct componentname *cnp = v->a_cnp;
int error;
struct tmpfs_dirent *de;
struct tmpfs_node *dnode;
dnode = VP_TO_TMPFS_DIR(dvp);
*vpp = NULLVP;
/* Check accessibility of requested node as a first step. */
error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, cnp->cn_thread);
if (error != 0)
goto out;
/* We cannot be requesting the parent directory of the root node. */
MPASS(IMPLIES(dnode->tn_type == VDIR &&
dnode->tn_dir.tn_parent == dnode,
!(cnp->cn_flags & ISDOTDOT)));
TMPFS_ASSERT_LOCKED(dnode);
if (dnode->tn_dir.tn_parent == NULL) {
error = ENOENT;
goto out;
}
if (cnp->cn_flags & ISDOTDOT) {
int ltype = 0;
ltype = VOP_ISLOCKED(dvp);
vhold(dvp);
VOP_UNLOCK(dvp, 0);
/* Allocate a new vnode on the matching entry. */
error = tmpfs_alloc_vp(dvp->v_mount, dnode->tn_dir.tn_parent,
cnp->cn_lkflags, vpp);
vn_lock(dvp, ltype | LK_RETRY);
vdrop(dvp);
} else if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') {
VREF(dvp);
*vpp = dvp;
error = 0;
} else {
de = tmpfs_dir_lookup(dnode, NULL, cnp);
if (de != NULL && de->td_node == NULL)
cnp->cn_flags |= ISWHITEOUT;
if (de == NULL || de->td_node == NULL) {
/* The entry was not found in the directory.
* This is OK if we are creating or renaming an
* entry and are working on the last component of
* the path name. */
if ((cnp->cn_flags & ISLASTCN) &&
(cnp->cn_nameiop == CREATE || \
cnp->cn_nameiop == RENAME ||
(cnp->cn_nameiop == DELETE &&
cnp->cn_flags & DOWHITEOUT &&
cnp->cn_flags & ISWHITEOUT))) {
error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred,
cnp->cn_thread);
if (error != 0)
goto out;
/* Keep the component name in the buffer for
* future uses. */
cnp->cn_flags |= SAVENAME;
error = EJUSTRETURN;
} else
error = ENOENT;
} else {
struct tmpfs_node *tnode;
/* The entry was found, so get its associated
* tmpfs_node. */
tnode = de->td_node;
/* If we are not at the last path component and
* found a non-directory or non-link entry (which
* may itself be pointing to a directory), raise
* an error. */
if ((tnode->tn_type != VDIR &&
tnode->tn_type != VLNK) &&
!(cnp->cn_flags & ISLASTCN)) {
error = ENOTDIR;
goto out;
}
/* If we are deleting or renaming the entry, keep
* track of its tmpfs_dirent so that it can be
* easily deleted later. */
if ((cnp->cn_flags & ISLASTCN) &&
(cnp->cn_nameiop == DELETE ||
cnp->cn_nameiop == RENAME)) {
error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred,
cnp->cn_thread);
if (error != 0)
goto out;
/* Allocate a new vnode on the matching entry. */
error = tmpfs_alloc_vp(dvp->v_mount, tnode,
cnp->cn_lkflags, vpp);
if (error != 0)
goto out;
if ((dnode->tn_mode & S_ISTXT) &&
VOP_ACCESS(dvp, VADMIN, cnp->cn_cred, cnp->cn_thread) &&
VOP_ACCESS(*vpp, VADMIN, cnp->cn_cred, cnp->cn_thread)) {
error = EPERM;
vput(*vpp);
*vpp = NULL;
goto out;
}
cnp->cn_flags |= SAVENAME;
} else {
error = tmpfs_alloc_vp(dvp->v_mount, tnode,
cnp->cn_lkflags, vpp);
}
}
}
/* Store the result of this lookup in the cache. Avoid this if the
* request was for creation, as it does not improve timings on
* emprical tests. */
if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE)
cache_enter(dvp, *vpp, cnp);
out:
/* If there were no errors, *vpp cannot be null and it must be
* locked. */
MPASS(IFF(error == 0, *vpp != NULLVP && VOP_ISLOCKED(*vpp)));
return error;
}
static int
tmpfs_readdir(struct vop_readdir_args *v)
{
struct vnode *vp = v->a_vp;
struct uio *uio = v->a_uio;
int *eofflag = v->a_eofflag;
u_long **cookies = v->a_cookies;
int *ncookies = v->a_ncookies;
int error;
off_t startoff;
off_t cnt = 0;
struct tmpfs_node *node;
/* This operation only makes sense on directory nodes. */
if (vp->v_type != VDIR)
return ENOTDIR;
node = VP_TO_TMPFS_DIR(vp);
startoff = uio->uio_offset;
if (uio->uio_offset == TMPFS_DIRCOOKIE_DOT) {
error = tmpfs_dir_getdotdent(node, uio);
if (error != 0)
goto outok;
cnt++;
}
if (uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT) {
error = tmpfs_dir_getdotdotdent(node, uio);
if (error != 0)
goto outok;
cnt++;
}
error = tmpfs_dir_getdents(node, uio, &cnt);
outok:
MPASS(error >= -1);
if (error == -1)
error = (cnt != 0) ? 0 : EINVAL;
if (eofflag != NULL)
*eofflag =
(error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF);
/* Update NFS-related variables. */
if (error == 0 && cookies != NULL && ncookies != NULL) {
off_t i;
off_t off = startoff;
struct tmpfs_dirent *de = NULL;
*ncookies = cnt;
*cookies = malloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK);
for (i = 0; i < cnt; i++) {
MPASS(off != TMPFS_DIRCOOKIE_EOF);
if (off == TMPFS_DIRCOOKIE_DOT) {
off = TMPFS_DIRCOOKIE_DOTDOT;
} else {
if (off == TMPFS_DIRCOOKIE_DOTDOT) {
de = TAILQ_FIRST(&node->tn_dir.tn_dirhead);
} else if (de != NULL) {
de = TAILQ_NEXT(de, td_entries);
} else {
de = tmpfs_dir_lookupbycookie(node,
off);
MPASS(de != NULL);
de = TAILQ_NEXT(de, td_entries);
}
if (de == NULL)
off = TMPFS_DIRCOOKIE_EOF;
else
off = tmpfs_dircookie(de);
}
(*cookies)[i] = off;
}
MPASS(uio->uio_offset == off);
}
return error;
}
static int
tmpfs_rmdir(struct vop_rmdir_args *v)
{
struct vnode *dvp = v->a_dvp;
struct vnode *vp = v->a_vp;
int error;
struct tmpfs_dirent *de;
struct tmpfs_mount *tmp;
struct tmpfs_node *dnode;
struct tmpfs_node *node;
MPASS(VOP_ISLOCKED(dvp));
MPASS(VOP_ISLOCKED(vp));
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. */
MPASS(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, v->a_cnp);
MPASS(TMPFS_DIRENT_MATCHES(de,
v->a_cnp->cn_nameptr,
v->a_cnp->cn_namelen));
/* 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(dvp, de);
if (v->a_cnp->cn_flags & DOWHITEOUT)
tmpfs_dir_whiteout_add(dvp, v->a_cnp);
/* No vnode should be allocated for this entry from this point */
TMPFS_NODE_LOCK(node);
TMPFS_ASSERT_ELOCKED(node);
node->tn_links--;
node->tn_dir.tn_parent = NULL;
node->tn_status |= TMPFS_NODE_ACCESSED | TMPFS_NODE_CHANGED | \
TMPFS_NODE_MODIFIED;
TMPFS_NODE_UNLOCK(node);
TMPFS_NODE_LOCK(dnode);
TMPFS_ASSERT_ELOCKED(dnode);
dnode->tn_links--;
dnode->tn_status |= TMPFS_NODE_ACCESSED | \
TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED;
TMPFS_NODE_UNLOCK(dnode);
cache_purge(dvp);
cache_purge(vp);
/* 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, TRUE);
/* Release the deleted vnode (will destroy the node, notify
* interested parties and clean it from the cache). */
dnode->tn_status |= TMPFS_NODE_CHANGED;
tmpfs_update(dvp);
error = 0;
out:
return error;
}
/*
* We acquire all but fdvp locks 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. On error release all vnode locks
* and decrement references the way tmpfs_rename() would do.
*/
static int
tmpfs_rename_relock(struct vnode *fdvp, struct vnode **fvpp,
struct vnode *tdvp, struct vnode **tvpp,
struct componentname *fcnp, struct componentname *tcnp)
{
struct vnode *nvp;
struct mount *mp;
struct tmpfs_dirent *de;
int error, restarts = 0;
VOP_UNLOCK(tdvp, 0);
if (*tvpp != NULL && *tvpp != tdvp)
VOP_UNLOCK(*tvpp, 0);
mp = fdvp->v_mount;
relock:
restarts += 1;
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);
goto relock;
}
/*
* Re-resolve fvp to be certain it still exists and fetch the
* correct vnode.
*/
de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(fdvp), NULL, fcnp);
if (de == NULL) {
VOP_UNLOCK(fdvp, 0);
VOP_UNLOCK(tdvp, 0);
if ((fcnp->cn_flags & ISDOTDOT) != 0 ||
(fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.'))
error = EINVAL;
else
error = ENOENT;
goto releout;
}
error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE | LK_NOWAIT, &nvp);
if (error != 0) {
VOP_UNLOCK(fdvp, 0);
VOP_UNLOCK(tdvp, 0);
if (error != EBUSY)
goto releout;
error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, &nvp);
if (error != 0)
goto releout;
VOP_UNLOCK(nvp, 0);
/*
* Concurrent rename race.
*/
if (nvp == tdvp) {
vrele(nvp);
error = EINVAL;
goto releout;
}
vrele(*fvpp);
*fvpp = nvp;
goto relock;
}
vrele(*fvpp);
*fvpp = nvp;
VOP_UNLOCK(*fvpp, 0);
/*
* Re-resolve tvp and acquire the vnode lock if present.
*/
de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(tdvp), NULL, tcnp);
/*
* If tvp disappeared we just carry on.
*/
if (de == NULL && *tvpp != NULL) {
vrele(*tvpp);
*tvpp = NULL;
}
/*
* Get the tvp ino if the lookup succeeded. We may have to restart
* if the non-blocking acquire fails.
*/
if (de != NULL) {
nvp = NULL;
error = tmpfs_alloc_vp(mp, de->td_node,
LK_EXCLUSIVE | LK_NOWAIT, &nvp);
if (*tvpp != NULL)
vrele(*tvpp);
*tvpp = nvp;
if (error != 0) {
VOP_UNLOCK(fdvp, 0);
VOP_UNLOCK(tdvp, 0);
if (error != EBUSY)
goto releout;
error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE,
&nvp);
if (error != 0)
goto releout;
VOP_UNLOCK(nvp, 0);
/*
* fdvp contains fvp, thus tvp (=fdvp) is not empty.
*/
if (nvp == fdvp) {
error = ENOTEMPTY;
goto releout;
}
goto relock;
}
}
tmpfs_rename_restarts += restarts;
return (0);
releout:
vrele(fdvp);
vrele(*fvpp);
vrele(tdvp);
if (*tvpp != NULL)
vrele(*tvpp);
tmpfs_rename_restarts += restarts;
return (error);
}
/*
* Allocates a new file of type 'type' and adds it to the parent directory
* 'dvp'; this addition is done using the component name given in 'cnp'.
* The ownership of the new file is automatically assigned based on the
* credentials of the caller (through 'cnp'), the group is set based on
* the parent directory and the mode is determined from the 'vap' argument.
* If successful, *vpp holds a vnode to the newly created file and zero
* is returned. Otherwise *vpp is NULL and the function returns an
* appropriate error code.
*/
int
tmpfs_alloc_file(struct vnode *dvp, struct vnode **vpp, struct vattr *vap,
struct namecache *ncp, struct ucred *cred, char *target)
{
int error;
struct tmpfs_dirent *de;
struct tmpfs_mount *tmp;
struct tmpfs_node *dnode;
struct tmpfs_node *node;
tmp = VFS_TO_TMPFS(dvp->v_mount);
dnode = VP_TO_TMPFS_DIR(dvp);
*vpp = NULL;
/*
* If the directory was removed but a process was CD'd into it,
* we do not allow any more file/dir creation within it. Otherwise
* we will lose track of it.
*/
KKASSERT(dnode->tn_type == VDIR);
if (dnode != tmp->tm_root && dnode->tn_dir.tn_parent == NULL)
return ENOENT;
/*
* Make sure the link count does not overflow.
*/
if (vap->va_type == VDIR && dnode->tn_links >= LINK_MAX)
return EMLINK;
/* Allocate a node that represents the new file. */
error = tmpfs_alloc_node(tmp, vap->va_type, cred->cr_uid,
dnode->tn_gid, vap->va_mode, target,
vap->va_rmajor, vap->va_rminor, &node);
if (error != 0)
return error;
TMPFS_NODE_LOCK(node);
/* Allocate a directory entry that points to the new file. */
error = tmpfs_alloc_dirent(tmp, node, ncp->nc_name, ncp->nc_nlen, &de);
if (error != 0) {
tmpfs_free_node(tmp, node);
/* eats node lock */
return error;
}
/* Allocate a vnode for the new file. */
error = tmpfs_alloc_vp(dvp->v_mount, NULL, node, LK_EXCLUSIVE, vpp);
if (error != 0) {
tmpfs_free_dirent(tmp, de);
tmpfs_free_node(tmp, node);
/* eats node lock */
return error;
}
/*
* Now that all required items are allocated, we can proceed to
* insert the new node into the directory, an operation that
* cannot fail.
*/
tmpfs_dir_attach(dnode, de);
TMPFS_NODE_UNLOCK(node);
return error;
}
