/*
* Look up an entry in a directory.
*
* NOTE: '.' and '..' are handled as special cases because
* no directory entries are actually stored for them. If this is
* the root of a filesystem, then '.zfs' is also treated as a
* special pseudo-directory.
*/
int
zfs_dirlook(znode_t *dzp, char *name, struct inode **ipp, int flags,
int *deflg, pathname_t *rpnp)
{
zfs_dirlock_t *dl;
znode_t *zp;
int error = 0;
uint64_t parent;
if (name[0] == 0 || (name[0] == '.' && name[1] == 0)) {
*ipp = ZTOI(dzp);
igrab(*ipp);
} else if (name[0] == '.' && name[1] == '.' && name[2] == 0) {
zfs_sb_t *zsb = ZTOZSB(dzp);
/*
* If we are a snapshot mounted under .zfs, return
* the vp for the snapshot directory.
*/
if ((error = sa_lookup(dzp->z_sa_hdl,
SA_ZPL_PARENT(zsb), &parent, sizeof (parent))) != 0)
return (error);
#ifdef HAVE_SNAPSHOT
if (parent == dzp->z_id && zsb->z_parent != zsb) {
error = zfsctl_root_lookup(zsb->z_parent->z_ctldir,
"snapshot", ipp, NULL, 0, NULL, kcred,
NULL, NULL, NULL);
return (error);
}
#endif /* HAVE_SNAPSHOT */
rw_enter(&dzp->z_parent_lock, RW_READER);
error = zfs_zget(zsb, parent, &zp);
if (error == 0)
*ipp = ZTOI(zp);
rw_exit(&dzp->z_parent_lock);
#ifdef HAVE_SNAPSHOT
} else if (zfs_has_ctldir(dzp) && strcmp(name, ZFS_CTLDIR_NAME) == 0) {
*ipp = zfsctl_root(dzp);
#endif /* HAVE_SNAPSHOT */
} else {
int zf;
zf = ZEXISTS | ZSHARED;
if (flags & FIGNORECASE)
zf |= ZCILOOK;
error = zfs_dirent_lock(&dl, dzp, name, &zp, zf, deflg, rpnp);
if (error == 0) {
*ipp = ZTOI(zp);
zfs_dirent_unlock(dl);
dzp->z_zn_prefetch = B_TRUE; /* enable prefetching */
}
rpnp = NULL;
}
if ((flags & FIGNORECASE) && rpnp && !error)
(void) strlcpy(rpnp->pn_buf, name, rpnp->pn_bufsize);
return (error);
}
/*
* Look up an entry in a directory.
*
* NOTE: '.' and '..' are handled as special cases because
* no directory entries are actually stored for them. If this is
* the root of a filesystem, then '.zfs' is also treated as a
* special pseudo-directory.
*/
int
zfs_dirlook(znode_t *dzp, char *name, vnode_t **vpp, int flags,
int *deflg, pathname_t *rpnp)
{
zfs_dirlock_t *dl;
znode_t *zp;
int error = 0;
if (name[0] == 0 || (name[0] == '.' && name[1] == 0)) {
*vpp = ZTOV(dzp);
VN_HOLD(*vpp);
} else if (name[0] == '.' && name[1] == '.' && name[2] == 0) {
zfsvfs_t *zfsvfs = dzp->z_zfsvfs;
/*
* If we are a snapshot mounted under .zfs, return
* the vp for the snapshot directory.
*/
if (dzp->z_phys->zp_parent == dzp->z_id &&
zfsvfs->z_parent != zfsvfs) {
error = zfsctl_root_lookup(zfsvfs->z_parent->z_ctldir,
"snapshot", vpp, NULL, 0, NULL, kcred,
NULL, NULL, NULL);
return (error);
}
rw_enter(&dzp->z_parent_lock, RW_READER);
error = zfs_zget(zfsvfs, dzp->z_phys->zp_parent, &zp);
if (error == 0)
*vpp = ZTOV(zp);
rw_exit(&dzp->z_parent_lock);
} else if (zfs_has_ctldir(dzp) && strcmp(name, ZFS_CTLDIR_NAME) == 0) {
*vpp = zfsctl_root(dzp);
} else {
int zf;
zf = ZEXISTS | ZSHARED;
if (flags & FIGNORECASE)
zf |= ZCILOOK;
error = zfs_dirent_lock(&dl, dzp, name, &zp, zf, deflg, rpnp);
if (error == 0) {
*vpp = ZTOV(zp);
zfs_dirent_unlock(dl);
dzp->z_zn_prefetch = B_TRUE; /* enable prefetching */
}
rpnp = NULL;
}
if ((flags & FIGNORECASE) && rpnp && !error)
(void) strlcpy(rpnp->pn_buf, name, rpnp->pn_bufsize);
return (error);
}
zfs_dirlook(znode_t *dzp, char *name, vnode_t **vpp)
#endif
{
zfs_dirlock_t *dl;
znode_t *zp;
int error = 0;
uint64_t parent;
#ifdef __APPLE__
char *name = cnp->cn_nameptr;
#endif
if (name[0] == 0 || (name[0] == '.' && name[1] == 0)) {
*vpp = ZTOV(dzp);
VN_HOLD(*vpp);
} else if (name[0] == '.' && name[1] == '.' && name[2] == 0) {
zfsvfs_t *zfsvfs = dzp->z_zfsvfs;
/*
* If we are a snapshot mounted under .zfs, return
* the vp for the snapshot directory.
*/
if ((error = sa_lookup(dzp->z_sa_hdl,
SA_ZPL_PARENT(zfsvfs), &parent, sizeof (parent))) != 0)
return (error);
if (parent == dzp->z_id && zfsvfs->z_parent != zfsvfs) {
error = zfsctl_root_lookup(zfsvfs->z_parent->z_ctldir,
"snapshot", vpp, NULL, 0, NULL, kcred
/*, NULL, NULL, NULL*/);
return (error);
}
rw_enter(&dzp->z_parent_lock, RW_READER);
error = zfs_zget(zfsvfs, parent, &zp);
if (error == 0)
*vpp = ZTOV(zp);
rw_exit(&dzp->z_parent_lock);
} else if (zfs_has_ctldir(dzp) && strcmp(name, ZFS_CTLDIR_NAME) == 0) {
*vpp = zfsctl_root(dzp);
} else {
#ifdef __APPLE__
error = zfs_dirent_lock(&dl, dzp, cnp, &zp, ZEXISTS | ZSHARED);
#else
error = zfs_dirent_lock(&dl, dzp, name, &zp, ZEXISTS | ZSHARED);
#endif
if (error == 0) {
*vpp = ZTOV(zp);
zfs_dirent_unlock(dl);
dzp->z_zn_prefetch = B_TRUE; /* enable prefetching */
}
}
return (error);
}
zpl_root_lookup(struct inode *dip, struct dentry *dentry, unsigned int flags)
#endif
{
cred_t *cr = CRED();
struct inode *ip;
int error;
crhold(cr);
error = -zfsctl_root_lookup(dip, dname(dentry), &ip, 0, cr, NULL, NULL);
ASSERT3S(error, <=, 0);
crfree(cr);
if (error) {
if (error == -ENOENT)
return (d_splice_alias(NULL, dentry));
else
return (ERR_PTR(error));
}
return (d_splice_alias(ip, dentry));
}
/*
* Look up an entry in a directory.
*
* NOTE: '.' and '..' are handled as special cases because
* no directory entries are actually stored for them. If this is
* the root of a filesystem, then '.zfs' is also treated as a
* special pseudo-directory.
*/
int
zfs_dirlook(znode_t *dzp, char *name, vnode_t **vpp)
{
zfs_dirlock_t *dl;
znode_t *zp;
int error = 0;
if (name[0] == 0 || (name[0] == '.' && name[1] == 0)) {
*vpp = ZTOV(dzp);
VN_HOLD(*vpp);
} else if (name[0] == '.' && name[1] == '.' && name[2] == 0) {
zfsvfs_t *zfsvfs = dzp->z_zfsvfs;
/*
* If we are a snapshot mounted under .zfs, return
* the vp for the snapshot directory.
*/
if (dzp->z_phys->zp_parent == dzp->z_id &&
zfsvfs->z_parent != zfsvfs) {
error = zfsctl_root_lookup(zfsvfs->z_parent->z_ctldir,
"snapshot", vpp, NULL, 0, NULL, kcred);
return (error);
}
rw_enter(&dzp->z_parent_lock, RW_READER);
error = zfs_zget(zfsvfs, dzp->z_phys->zp_parent, &zp);
if (error == 0)
*vpp = ZTOV(zp);
rw_exit(&dzp->z_parent_lock);
} else if (zfs_has_ctldir(dzp) && strcmp(name, ZFS_CTLDIR_NAME) == 0) {
*vpp = zfsctl_root(dzp);
} else {
error = zfs_dirent_lock(&dl, dzp, name, &zp, ZEXISTS | ZSHARED);
if (error == 0) {
*vpp = ZTOV(zp);
zfs_dirent_unlock(dl);
dzp->z_zn_prefetch = B_TRUE; /* enable prefetching */
}
}
return (error);
}
int
zfs_vget(struct super_block *sb, struct inode **ipp, fid_t *fidp)
{
zfs_sb_t *zsb = sb->s_fs_info;
znode_t *zp;
uint64_t object = 0;
uint64_t fid_gen = 0;
uint64_t gen_mask;
uint64_t zp_gen;
int i, err;
*ipp = NULL;
ZFS_ENTER(zsb);
if (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(zsb);
err = zfsctl_lookup_objset(sb, objsetid, &zsb);
if (err)
return (SET_ERROR(EINVAL));
ZFS_ENTER(zsb);
}
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(zsb);
return (SET_ERROR(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)) {
*ipp = zsb->z_ctldir;
ASSERT(*ipp != NULL);
if (object == ZFSCTL_INO_SNAPDIR) {
VERIFY(zfsctl_root_lookup(*ipp, "snapshot", ipp,
0, kcred, NULL, NULL) == 0);
} else {
igrab(*ipp);
}
ZFS_EXIT(zsb);
return (0);
}
gen_mask = -1ULL >> (64 - 8 * i);
dprintf("getting %llu [%llu mask %llx]\n", object, fid_gen, gen_mask);
if ((err = zfs_zget(zsb, object, &zp))) {
ZFS_EXIT(zsb);
return (err);
}
(void) sa_lookup(zp->z_sa_hdl, SA_ZPL_GEN(zsb), &zp_gen,
sizeof (uint64_t));
zp_gen = zp_gen & gen_mask;
if (zp_gen == 0)
zp_gen = 1;
if (zp->z_unlinked || zp_gen != fid_gen) {
dprintf("znode gen (%llu) != fid gen (%llu)\n", zp_gen,
fid_gen);
iput(ZTOI(zp));
ZFS_EXIT(zsb);
return (SET_ERROR(EINVAL));
}
*ipp = ZTOI(zp);
if (*ipp)
zfs_inode_update(ITOZ(*ipp));
ZFS_EXIT(zsb);
return (0);
}
static int
zfs_vget(vfs_t *vfsp, vnode_t **vpp, fid_t *fidp)
{
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);
if (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) == 0);
} else {
VN_HOLD(*vpp);
}
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_reap || 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);
ZFS_EXIT(zfsvfs);
return (0);
}
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);
}