static int
tmpfs_open(struct vop_open_args *v)
{
struct vnode *vp = v->a_vp;
int mode = v->a_mode;
int error;
struct tmpfs_node *node;
MPASS(VOP_ISLOCKED(vp));
node = VP_TO_TMPFS_NODE(vp);
/* The file is still active but all its names have been removed
* (e.g. by a "rmdir $(pwd)"). It cannot be opened any more as
* it is about to die. */
if (node->tn_links < 1)
return (ENOENT);
/* If the file is marked append-only, deny write requests. */
if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE)
error = EPERM;
else {
error = 0;
vnode_create_vobject(vp, node->tn_size, v->a_td);
}
MPASS(VOP_ISLOCKED(vp));
return error;
}
/*
* File handle to vnode
*
* Have to be really careful about stale file handles:
* - check that the inode number is valid
* - call ext2_vget() to get the locked inode
* - check for an unallocated inode (i_mode == 0)
* - check that the given client host has export rights and return
* those rights via. exflagsp and credanonp
*/
static int
ext2_fhtovp(struct mount *mp, struct fid *fhp, int flags, struct vnode **vpp)
{
struct inode *ip;
struct ufid *ufhp;
struct vnode *nvp;
struct m_ext2fs *fs;
int error;
ufhp = (struct ufid *)fhp;
fs = VFSTOEXT2(mp)->um_e2fs;
if (ufhp->ufid_ino < EXT2_ROOTINO ||
ufhp->ufid_ino > fs->e2fs_gcount * fs->e2fs->e2fs_ipg)
return (ESTALE);
error = VFS_VGET(mp, ufhp->ufid_ino, LK_EXCLUSIVE, &nvp);
if (error) {
*vpp = NULLVP;
return (error);
}
ip = VTOI(nvp);
if (ip->i_mode == 0 ||
ip->i_gen != ufhp->ufid_gen || ip->i_nlink <= 0) {
vput(nvp);
*vpp = NULLVP;
return (ESTALE);
}
*vpp = nvp;
vnode_create_vobject(*vpp, 0, curthread);
return (0);
}
void
fuse_vnode_open(struct vnode *vp, int32_t fuse_open_flags, struct thread *td)
{
/*
* Funcation is called for every vnode open.
* Merge fuse_open_flags it may be 0
*
* XXXIP: Handle FOPEN_KEEP_CACHE
*/
/*
* Ideally speaking, direct io should be enabled on
* fd's but do not see of any way of providing that
* this implementation.
* Also cannot think of a reason why would two
* different fd's on same vnode would like
* have DIRECT_IO turned on and off. But linux
* based implementation works on an fd not an
* inode and provides such a feature.
*
* XXXIP: Handle fd based DIRECT_IO
*/
if (fuse_open_flags & FOPEN_DIRECT_IO) {
VTOFUD(vp)->flag |= FN_DIRECTIO;
} else {
VTOFUD(vp)->flag &= ~FN_DIRECTIO;
}
if (vnode_vtype(vp) == VREG) {
/* XXXIP prevent getattr, by using cached node size */
vnode_create_vobject(vp, 0, td);
}
}
static int
udf_open(struct vop_open_args *ap) {
struct udf_node *np = VTON(ap->a_vp);
off_t fsize;
fsize = le64toh(np->fentry->inf_len);
vnode_create_vobject(ap->a_vp, fsize, ap->a_td);
return 0;
}
static int
reiserfs_open(struct vop_open_args *ap)
{
/* Files marked append-only must be opened for appending. */
if ((VTOI(ap->a_vp)->i_flags & APPEND) &&
(ap->a_mode & (FWRITE | O_APPEND)) == FWRITE)
return (EPERM);
vnode_create_vobject(ap->a_vp, VTOI(ap->a_vp)->i_size, ap->a_td);
return (0);
}
void
fuse_vnode_open(struct vnode *vp, int32_t fuse_open_flags, struct thread *td)
{
/*
* Funcation is called for every vnode open.
* Merge fuse_open_flags it may be 0
*
* XXXIP: Handle FOPEN_DIRECT_IO and FOPEN_KEEP_CACHE
*/
if (vnode_vtype(vp) == VREG) {
/* XXXIP prevent getattr, by using cached node size */
vnode_create_vobject(vp, 0, td);
}
}
static int
msdosfs_fhtovp(struct mount *mp, struct fid *fhp, int flags, struct vnode **vpp)
{
struct msdosfsmount *pmp = VFSTOMSDOSFS(mp);
struct defid *defhp = (struct defid *) fhp;
struct denode *dep;
int error;
error = deget(pmp, defhp->defid_dirclust, defhp->defid_dirofs, &dep);
if (error) {
*vpp = NULLVP;
return (error);
}
*vpp = DETOV(dep);
vnode_create_vobject(*vpp, dep->de_FileSize, curthread);
return (0);
}
static int
_xfs_open(
struct vop_open_args /* {
struct vnode *a_vp;
int a_mode;
struct ucred *a_cred;
struct thread *a_td;
struct file *a_fp;
} */ *ap)
{
int error;
XVOP_OPEN(VPTOXFSVP(ap->a_vp), ap->a_cred, error);
if (error == 0)
vnode_create_vobject(ap->a_vp, 0, ap->a_td);
return (error);
}
static int
ext2_open(struct vop_open_args *ap)
{
if (ap->a_vp->v_type == VBLK || ap->a_vp->v_type == VCHR)
return (EOPNOTSUPP);
/*
* Files marked append-only must be opened for appending.
*/
if ((VTOI(ap->a_vp)->i_flags & APPEND) &&
(ap->a_mode & (FWRITE | O_APPEND)) == FWRITE)
return (EPERM);
vnode_create_vobject(ap->a_vp, VTOI(ap->a_vp)->i_size, ap->a_td);
return (0);
}
static int
udf_fhtovp(struct mount *mp, struct fid *fhp, int flags, struct vnode **vpp)
{
struct ifid *ifhp;
struct vnode *nvp;
struct udf_node *np;
off_t fsize;
int error;
ifhp = (struct ifid *)fhp;
if ((error = VFS_VGET(mp, ifhp->ifid_ino, LK_EXCLUSIVE, &nvp)) != 0) {
*vpp = NULLVP;
return (error);
}
np = VTON(nvp);
fsize = le64toh(np->fentry->inf_len);
*vpp = nvp;
vnode_create_vobject(*vpp, fsize, curthread);
return (0);
}
static int
p9fs_open(struct vop_open_args *ap)
{
int error;
struct p9fs_node *np = ap->a_vp->v_data;
struct vattr vattr;
uint32_t fid = np->p9n_fid;
printf("%s(fid %u)\n", __func__, np->p9n_fid);
/*
* XXX XXX XXX
* XXX Each fid is associated with a particular open mode, so this
* isn't good enough. Need to map the mode to a particular fid.
* Oh, but wait, we can't determine the correct fid for a given
* client I/O call, because the filesystem can't store per file
* descriptor state... sigh...
*
* diod's docs for 9P2000.L mention that each user gets its own
* attach fid on which to perform its operations. That doesn't help
* with the per-fid open mode issue though... a given user can have
* multiple open modes.
*
* So perhaps p9fs would have to create a list of per-user open modes
* to fids? Then read/write calls would lookup the appropriate one
* given the implied request mode?
*
* IO_APPEND is always included for VOP_WRITE() for fd's that were
* opened with O_APPEND. So for each user we'd need at most three
* different fids: one each for reads, writes, and appends. Each fid
* would have a refcount based on the number of times an open() call
* was issued with its bit set in the mode flag. That way we could
* clunk fids only when they no longer have corresponding users.
*
* However, R/W modes are quite common, so perhaps we should try to
* always open R/W and let VFS do the per-fd restriction? Ah, but
* that won't work because some files will only be openable read-only
* or write-only or append-only on the server end.
*
* Append presents another challenge: a given user can have multiple
* append fd's open on the same file at once. Different appends can
* be at different offsets. And some filesystems implement having
* append-only files. However, looks like in that scenario the
* overlapping appends will always just get sent to the file's
* current size regardless. This does mean we need an append fid.
*
* Finally, a p9fs_node should be indexed in the vfs hash by qid
* instead of by fid, since each vnode will be mappable to
* potentially many fids. p9fs_nget() already takes a qid. The
* main challenge is that vfs_hash_insert() only takes an u_int for
* the hash value, so we'll need to provide a comparator.
*
* Although, according to py9p, we can't clone an open fid, so
* perhaps we need a normal fid that is used just for cloning and
* metadata operations.
*
* NB: We likely also have to implement Tattach for every user, so
* that the server has correct credentials for each fid and
* tree of fids. The initial attach would be defined by the
* mount, but followup accesses by other users will require
* their own attach.
*/
if (np->p9n_opens > 0) {
np->p9n_opens++;
return (0);
}
/* XXX Can this be cached in some reasonable fashion? */
error = p9fs_client_stat(np->p9n_session, np->p9n_fid, &vattr);
if (error != 0)
return (error);
/*
* XXX VFS calls VOP_OPEN() on a directory it's about to perform
* VOP_READDIR() calls on. However, 9P2000 Twalk requires that
* the given fid not have been opened. What should we do?
*
* For now, this call performs an internal Twalk to obtain a cloned
* fid that can be opened separately. It will be clunk'd at the
* same time as the unopened fid.
*/
if (ap->a_vp->v_type == VDIR) {
if (np->p9n_ofid == 0) {
np->p9n_ofid = p9fs_getfid(np->p9n_session);
error = p9fs_client_walk(np->p9n_session, np->p9n_fid,
&np->p9n_ofid, 0, NULL, &np->p9n_qid);
if (error != 0) {
np->p9n_ofid = 0;
return (error);
}
}
fid = np->p9n_ofid;
}
error = p9fs_client_open(np->p9n_session, fid, ap->a_mode);
if (error == 0) {
np->p9n_opens = 1;
vnode_create_vobject(ap->a_vp, vattr.va_bytes, ap->a_td);
}
return (error);
}
static int
zfs_fhtovp(vfs_t *vfsp, fid_t *fidp, vnode_t **vpp)
{
zfsvfs_t *zfsvfs = vfsp->vfs_data;
znode_t *zp;
uint64_t object = 0;
uint64_t fid_gen = 0;
uint64_t gen_mask;
uint64_t zp_gen;
int i, err;
*vpp = NULL;
ZFS_ENTER(zfsvfs);
/*
* On FreeBSD we can get snapshot's mount point or its parent file
* system mount point depending if snapshot is already mounted or not.
*/
if (zfsvfs->z_parent == zfsvfs && fidp->fid_len == LONG_FID_LEN) {
zfid_long_t *zlfid = (zfid_long_t *)fidp;
uint64_t objsetid = 0;
uint64_t setgen = 0;
for (i = 0; i < sizeof (zlfid->zf_setid); i++)
objsetid |= ((uint64_t)zlfid->zf_setid[i]) << (8 * i);
for (i = 0; i < sizeof (zlfid->zf_setgen); i++)
setgen |= ((uint64_t)zlfid->zf_setgen[i]) << (8 * i);
ZFS_EXIT(zfsvfs);
err = zfsctl_lookup_objset(vfsp, objsetid, &zfsvfs);
if (err)
return (EINVAL);
ZFS_ENTER(zfsvfs);
}
if (fidp->fid_len == SHORT_FID_LEN || fidp->fid_len == LONG_FID_LEN) {
zfid_short_t *zfid = (zfid_short_t *)fidp;
for (i = 0; i < sizeof (zfid->zf_object); i++)
object |= ((uint64_t)zfid->zf_object[i]) << (8 * i);
for (i = 0; i < sizeof (zfid->zf_gen); i++)
fid_gen |= ((uint64_t)zfid->zf_gen[i]) << (8 * i);
} else {
ZFS_EXIT(zfsvfs);
return (EINVAL);
}
/* A zero fid_gen means we are in the .zfs control directories */
if (fid_gen == 0 &&
(object == ZFSCTL_INO_ROOT || object == ZFSCTL_INO_SNAPDIR)) {
*vpp = zfsvfs->z_ctldir;
ASSERT(*vpp != NULL);
if (object == ZFSCTL_INO_SNAPDIR) {
VERIFY(zfsctl_root_lookup(*vpp, "snapshot", vpp, NULL,
0, NULL, NULL, NULL, NULL, NULL) == 0);
} else {
VN_HOLD(*vpp);
}
vn_lock(*vpp, LK_EXCLUSIVE | LK_RETRY);
ZFS_EXIT(zfsvfs);
return (0);
}
gen_mask = -1ULL >> (64 - 8 * i);
dprintf("getting %llu [%u mask %llx]\n", object, fid_gen, gen_mask);
if (err = zfs_zget(zfsvfs, object, &zp)) {
ZFS_EXIT(zfsvfs);
return (err);
}
zp_gen = zp->z_phys->zp_gen & gen_mask;
if (zp_gen == 0)
zp_gen = 1;
if (zp->z_unlinked || zp_gen != fid_gen) {
dprintf("znode gen (%u) != fid gen (%u)\n", zp_gen, fid_gen);
VN_RELE(ZTOV(zp));
ZFS_EXIT(zfsvfs);
return (EINVAL);
}
*vpp = ZTOV(zp);
vn_lock(*vpp, LK_EXCLUSIVE | LK_RETRY);
vnode_create_vobject(*vpp, zp->z_phys->zp_size, curthread);
ZFS_EXIT(zfsvfs);
return (0);
}
