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mirror_zfs/module/os/freebsd/zfs/zfs_znode.c
Ryan Moeller 210231ede0 FreeBSD: Implement xattr=sa 
FreeBSD historically has not cared about the xattr property; it was
always treated as xattr=on.  With xattr=on, xattrs are stored as files
in a hidden xattr directory.  With xattr=sa, xattrs are stored as
system attributes and get cached in nvlists during xattr operations.
This makes SA xattrs simpler and more efficient to manipulate.  FreeBSD
needs to implement the SA xattr operations for feature parity with
Linux and to ensure that SA xattrs are accessible when migrated or
replicated from Linux.

Following the example set by Linux, refactor our existing extattr vnops
to split off the parts handling dir style xattrs, and add the
corresponding SA handling parts.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Signed-off-by: Ryan Moeller <ryan@iXsystems.com>
Closes #11997
2021-05-13 15:14:12 -07:00

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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2012, 2014 by Delphix. All rights reserved.
* Copyright (c) 2014 Integros [integros.com]
*/
/* Portions Copyright 2007 Jeremy Teo */
/* Portions Copyright 2011 Martin Matuska <mm@FreeBSD.org> */
#ifdef _KERNEL
#include <sys/types.h>
#include <sys/param.h>
#include <sys/time.h>
#include <sys/systm.h>
#include <sys/sysmacros.h>
#include <sys/resource.h>
#include <sys/mntent.h>
#include <sys/u8_textprep.h>
#include <sys/dsl_dataset.h>
#include <sys/vfs.h>
#include <sys/vnode.h>
#include <sys/file.h>
#include <sys/kmem.h>
#include <sys/errno.h>
#include <sys/unistd.h>
#include <sys/atomic.h>
#include <sys/zfs_dir.h>
#include <sys/zfs_acl.h>
#include <sys/zfs_ioctl.h>
#include <sys/zfs_rlock.h>
#include <sys/zfs_fuid.h>
#include <sys/dnode.h>
#include <sys/fs/zfs.h>
#endif /* _KERNEL */
#include <sys/dmu.h>
#include <sys/dmu_objset.h>
#include <sys/dmu_tx.h>
#include <sys/zfs_refcount.h>
#include <sys/stat.h>
#include <sys/zap.h>
#include <sys/zfs_znode.h>
#include <sys/sa.h>
#include <sys/zfs_sa.h>
#include <sys/zfs_stat.h>
#include "zfs_prop.h"
#include "zfs_comutil.h"
/* Used by fstat(1). */
SYSCTL_INT(_debug_sizeof, OID_AUTO, znode, CTLFLAG_RD,
SYSCTL_NULL_INT_PTR, sizeof (znode_t), "sizeof(znode_t)");
/*
* Define ZNODE_STATS to turn on statistic gathering. By default, it is only
* turned on when DEBUG is also defined.
*/
#ifdef ZFS_DEBUG
#define ZNODE_STATS
#endif /* DEBUG */
#ifdef ZNODE_STATS
#define ZNODE_STAT_ADD(stat) ((stat)++)
#else
#define ZNODE_STAT_ADD(stat) /* nothing */
#endif /* ZNODE_STATS */
/*
* Functions needed for userland (ie: libzpool) are not put under
* #ifdef_KERNEL; the rest of the functions have dependencies
* (such as VFS logic) that will not compile easily in userland.
*/
#ifdef _KERNEL
#if !defined(KMEM_DEBUG) && __FreeBSD_version >= 1300102
#define _ZFS_USE_SMR
static uma_zone_t znode_uma_zone;
#else
static kmem_cache_t *znode_cache = NULL;
#endif
extern struct vop_vector zfs_vnodeops;
extern struct vop_vector zfs_fifoops;
extern struct vop_vector zfs_shareops;
/*
* This callback is invoked when acquiring a RL_WRITER or RL_APPEND lock on
* z_rangelock. It will modify the offset and length of the lock to reflect
* znode-specific information, and convert RL_APPEND to RL_WRITER. This is
* called with the rangelock_t's rl_lock held, which avoids races.
*/
static void
zfs_rangelock_cb(zfs_locked_range_t *new, void *arg)
{
znode_t *zp = arg;
/*
* If in append mode, convert to writer and lock starting at the
* current end of file.
*/
if (new->lr_type == RL_APPEND) {
new->lr_offset = zp->z_size;
new->lr_type = RL_WRITER;
}
/*
* If we need to grow the block size then lock the whole file range.
*/
uint64_t end_size = MAX(zp->z_size, new->lr_offset + new->lr_length);
if (end_size > zp->z_blksz && (!ISP2(zp->z_blksz) ||
zp->z_blksz < ZTOZSB(zp)->z_max_blksz)) {
new->lr_offset = 0;
new->lr_length = UINT64_MAX;
}
}
static int
zfs_znode_cache_constructor(void *buf, void *arg, int kmflags)
{
znode_t *zp = buf;
POINTER_INVALIDATE(&zp->z_zfsvfs);
list_link_init(&zp->z_link_node);
mutex_init(&zp->z_lock, NULL, MUTEX_DEFAULT, NULL);
mutex_init(&zp->z_acl_lock, NULL, MUTEX_DEFAULT, NULL);
rw_init(&zp->z_xattr_lock, NULL, RW_DEFAULT, NULL);
zfs_rangelock_init(&zp->z_rangelock, zfs_rangelock_cb, zp);
zp->z_acl_cached = NULL;
zp->z_xattr_cached = NULL;
zp->z_xattr_parent = 0;
zp->z_vnode = NULL;
return (0);
}
/*ARGSUSED*/
static void
zfs_znode_cache_destructor(void *buf, void *arg)
{
znode_t *zp = buf;
ASSERT(!POINTER_IS_VALID(zp->z_zfsvfs));
ASSERT3P(zp->z_vnode, ==, NULL);
ASSERT(!list_link_active(&zp->z_link_node));
mutex_destroy(&zp->z_lock);
mutex_destroy(&zp->z_acl_lock);
rw_destroy(&zp->z_xattr_lock);
zfs_rangelock_fini(&zp->z_rangelock);
ASSERT3P(zp->z_acl_cached, ==, NULL);
ASSERT3P(zp->z_xattr_cached, ==, NULL);
}
#ifdef _ZFS_USE_SMR
VFS_SMR_DECLARE;
static int
zfs_znode_cache_constructor_smr(void *mem, int size __unused, void *private,
int flags)
{
return (zfs_znode_cache_constructor(mem, private, flags));
}
static void
zfs_znode_cache_destructor_smr(void *mem, int size __unused, void *private)
{
zfs_znode_cache_destructor(mem, private);
}
void
zfs_znode_init(void)
{
/*
* Initialize zcache
*/
ASSERT3P(znode_uma_zone, ==, NULL);
znode_uma_zone = uma_zcreate("zfs_znode_cache",
sizeof (znode_t), zfs_znode_cache_constructor_smr,
zfs_znode_cache_destructor_smr, NULL, NULL, 0, 0);
VFS_SMR_ZONE_SET(znode_uma_zone);
}
static znode_t *
zfs_znode_alloc_kmem(int flags)
{
return (uma_zalloc_smr(znode_uma_zone, flags));
}
static void
zfs_znode_free_kmem(znode_t *zp)
{
if (zp->z_xattr_cached) {
nvlist_free(zp->z_xattr_cached);
zp->z_xattr_cached = NULL;
}
uma_zfree_smr(znode_uma_zone, zp);
}
#else
void
zfs_znode_init(void)
{
/*
* Initialize zcache
*/
ASSERT3P(znode_cache, ==, NULL);
znode_cache = kmem_cache_create("zfs_znode_cache",
sizeof (znode_t), 0, zfs_znode_cache_constructor,
zfs_znode_cache_destructor, NULL, NULL, NULL, 0);
}
static znode_t *
zfs_znode_alloc_kmem(int flags)
{
return (kmem_cache_alloc(znode_cache, flags));
}
static void
zfs_znode_free_kmem(znode_t *zp)
{
if (zp->z_xattr_cached) {
nvlist_free(zp->z_xattr_cached);
zp->z_xattr_cached = NULL;
}
kmem_cache_free(znode_cache, zp);
}
#endif
void
zfs_znode_fini(void)
{
/*
* Cleanup zcache
*/
#ifdef _ZFS_USE_SMR
if (znode_uma_zone) {
uma_zdestroy(znode_uma_zone);
znode_uma_zone = NULL;
}
#else
if (znode_cache) {
kmem_cache_destroy(znode_cache);
znode_cache = NULL;
}
#endif
}
static int
zfs_create_share_dir(zfsvfs_t *zfsvfs, dmu_tx_t *tx)
{
zfs_acl_ids_t acl_ids;
vattr_t vattr;
znode_t *sharezp;
znode_t *zp;
int error;
vattr.va_mask = AT_MODE|AT_UID|AT_GID;
vattr.va_type = VDIR;
vattr.va_mode = S_IFDIR|0555;
vattr.va_uid = crgetuid(kcred);
vattr.va_gid = crgetgid(kcred);
sharezp = zfs_znode_alloc_kmem(KM_SLEEP);
ASSERT(!POINTER_IS_VALID(sharezp->z_zfsvfs));
sharezp->z_unlinked = 0;
sharezp->z_atime_dirty = 0;
sharezp->z_zfsvfs = zfsvfs;
sharezp->z_is_sa = zfsvfs->z_use_sa;
VERIFY0(zfs_acl_ids_create(sharezp, IS_ROOT_NODE, &vattr,
kcred, NULL, &acl_ids));
zfs_mknode(sharezp, &vattr, tx, kcred, IS_ROOT_NODE, &zp, &acl_ids);
ASSERT3P(zp, ==, sharezp);
POINTER_INVALIDATE(&sharezp->z_zfsvfs);
error = zap_add(zfsvfs->z_os, MASTER_NODE_OBJ,
ZFS_SHARES_DIR, 8, 1, &sharezp->z_id, tx);
zfsvfs->z_shares_dir = sharezp->z_id;
zfs_acl_ids_free(&acl_ids);
sa_handle_destroy(sharezp->z_sa_hdl);
zfs_znode_free_kmem(sharezp);
return (error);
}
/*
* define a couple of values we need available
* for both 64 and 32 bit environments.
*/
#ifndef NBITSMINOR64
#define NBITSMINOR64 32
#endif
#ifndef MAXMAJ64
#define MAXMAJ64 0xffffffffUL
#endif
#ifndef MAXMIN64
#define MAXMIN64 0xffffffffUL
#endif
/*
* Create special expldev for ZFS private use.
* Can't use standard expldev since it doesn't do
* what we want. The standard expldev() takes a
* dev32_t in LP64 and expands it to a long dev_t.
* We need an interface that takes a dev32_t in ILP32
* and expands it to a long dev_t.
*/
static uint64_t
zfs_expldev(dev_t dev)
{
return (((uint64_t)major(dev) << NBITSMINOR64) | minor(dev));
}
/*
* Special cmpldev for ZFS private use.
* Can't use standard cmpldev since it takes
* a long dev_t and compresses it to dev32_t in
* LP64. We need to do a compaction of a long dev_t
* to a dev32_t in ILP32.
*/
dev_t
zfs_cmpldev(uint64_t dev)
{
return (makedev((dev >> NBITSMINOR64), (dev & MAXMIN64)));
}
static void
zfs_znode_sa_init(zfsvfs_t *zfsvfs, znode_t *zp,
dmu_buf_t *db, dmu_object_type_t obj_type, sa_handle_t *sa_hdl)
{
ASSERT(!POINTER_IS_VALID(zp->z_zfsvfs) || (zfsvfs == zp->z_zfsvfs));
ASSERT(MUTEX_HELD(ZFS_OBJ_MUTEX(zfsvfs, zp->z_id)));
ASSERT3P(zp->z_sa_hdl, ==, NULL);
ASSERT3P(zp->z_acl_cached, ==, NULL);
if (sa_hdl == NULL) {
VERIFY0(sa_handle_get_from_db(zfsvfs->z_os, db, zp,
SA_HDL_SHARED, &zp->z_sa_hdl));
} else {
zp->z_sa_hdl = sa_hdl;
sa_set_userp(sa_hdl, zp);
}
zp->z_is_sa = (obj_type == DMU_OT_SA) ? B_TRUE : B_FALSE;
/*
* Slap on VROOT if we are the root znode unless we are the root
* node of a snapshot mounted under .zfs.
*/
if (zp->z_id == zfsvfs->z_root && zfsvfs->z_parent == zfsvfs)
ZTOV(zp)->v_flag |= VROOT;
vn_exists(ZTOV(zp));
}
void
zfs_znode_dmu_fini(znode_t *zp)
{
ASSERT(MUTEX_HELD(ZFS_OBJ_MUTEX(zp->z_zfsvfs, zp->z_id)) ||
zp->z_unlinked ||
ZFS_TEARDOWN_INACTIVE_WRITE_HELD(zp->z_zfsvfs));
sa_handle_destroy(zp->z_sa_hdl);
zp->z_sa_hdl = NULL;
}
static void
zfs_vnode_forget(vnode_t *vp)
{
/* copied from insmntque_stddtr */
vp->v_data = NULL;
vp->v_op = &dead_vnodeops;
vgone(vp);
vput(vp);
}
/*
* Construct a new znode/vnode and initialize.
*
* This does not do a call to dmu_set_user() that is
* up to the caller to do, in case you don't want to
* return the znode
*/
static znode_t *
zfs_znode_alloc(zfsvfs_t *zfsvfs, dmu_buf_t *db, int blksz,
dmu_object_type_t obj_type, sa_handle_t *hdl)
{
znode_t *zp;
vnode_t *vp;
uint64_t mode;
uint64_t parent;
#ifdef notyet
uint64_t mtime[2], ctime[2];
#endif
uint64_t projid = ZFS_DEFAULT_PROJID;
sa_bulk_attr_t bulk[9];
int count = 0;
int error;
zp = zfs_znode_alloc_kmem(KM_SLEEP);
#ifndef _ZFS_USE_SMR
KASSERT((zfsvfs->z_parent->z_vfs->mnt_kern_flag & MNTK_FPLOOKUP) == 0,
("%s: fast path lookup enabled without smr", __func__));
#endif
#if __FreeBSD_version >= 1300076
KASSERT(curthread->td_vp_reserved != NULL,
("zfs_znode_alloc: getnewvnode without any vnodes reserved"));
#else
KASSERT(curthread->td_vp_reserv > 0,
("zfs_znode_alloc: getnewvnode without any vnodes reserved"));
#endif
error = getnewvnode("zfs", zfsvfs->z_parent->z_vfs, &zfs_vnodeops, &vp);
if (error != 0) {
zfs_znode_free_kmem(zp);
return (NULL);
}
zp->z_vnode = vp;
vp->v_data = zp;
ASSERT(!POINTER_IS_VALID(zp->z_zfsvfs));
zp->z_sa_hdl = NULL;
zp->z_unlinked = 0;
zp->z_atime_dirty = 0;
zp->z_mapcnt = 0;
zp->z_id = db->db_object;
zp->z_blksz = blksz;
zp->z_seq = 0x7A4653;
zp->z_sync_cnt = 0;
#if __FreeBSD_version >= 1300139
atomic_store_ptr(&zp->z_cached_symlink, NULL);
#endif
vp = ZTOV(zp);
zfs_znode_sa_init(zfsvfs, zp, db, obj_type, hdl);
SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zfsvfs), NULL, &mode, 8);
SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GEN(zfsvfs), NULL, &zp->z_gen, 8);
SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs), NULL,
&zp->z_size, 8);
SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs), NULL,
&zp->z_links, 8);
SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL,
&zp->z_pflags, 8);
SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_PARENT(zfsvfs), NULL, &parent, 8);
SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ATIME(zfsvfs), NULL,
&zp->z_atime, 16);
#ifdef notyet
SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL,
&mtime, 16);
SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL,
&ctime, 16);
#endif
SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_UID(zfsvfs), NULL,
&zp->z_uid, 8);
SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GID(zfsvfs), NULL,
&zp->z_gid, 8);
if (sa_bulk_lookup(zp->z_sa_hdl, bulk, count) != 0 || zp->z_gen == 0 ||
(dmu_objset_projectquota_enabled(zfsvfs->z_os) &&
(zp->z_pflags & ZFS_PROJID) &&
sa_lookup(zp->z_sa_hdl, SA_ZPL_PROJID(zfsvfs), &projid, 8) != 0)) {
if (hdl == NULL)
sa_handle_destroy(zp->z_sa_hdl);
zfs_vnode_forget(vp);
zp->z_vnode = NULL;
zfs_znode_free_kmem(zp);
return (NULL);
}
zp->z_projid = projid;
zp->z_mode = mode;
/* Cache the xattr parent id */
if (zp->z_pflags & ZFS_XATTR)
zp->z_xattr_parent = parent;
vp->v_type = IFTOVT((mode_t)mode);
switch (vp->v_type) {
case VDIR:
zp->z_zn_prefetch = B_TRUE; /* z_prefetch default is enabled */
break;
case VFIFO:
vp->v_op = &zfs_fifoops;
break;
case VREG:
if (parent == zfsvfs->z_shares_dir) {
ASSERT0(zp->z_uid);
ASSERT0(zp->z_gid);
vp->v_op = &zfs_shareops;
}
break;
default:
break;
}
mutex_enter(&zfsvfs->z_znodes_lock);
list_insert_tail(&zfsvfs->z_all_znodes, zp);
zfsvfs->z_nr_znodes++;
zp->z_zfsvfs = zfsvfs;
mutex_exit(&zfsvfs->z_znodes_lock);
/*
* Acquire vnode lock before making it available to the world.
*/
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
VN_LOCK_AREC(vp);
if (vp->v_type != VFIFO)
VN_LOCK_ASHARE(vp);
return (zp);
}
static uint64_t empty_xattr;
static uint64_t pad[4];
static zfs_acl_phys_t acl_phys;
/*
* Create a new DMU object to hold a zfs znode.
*
* IN: dzp - parent directory for new znode
* vap - file attributes for new znode
* tx - dmu transaction id for zap operations
* cr - credentials of caller
* flag - flags:
* IS_ROOT_NODE - new object will be root
* IS_XATTR - new object is an attribute
* bonuslen - length of bonus buffer
* setaclp - File/Dir initial ACL
* fuidp - Tracks fuid allocation.
*
* OUT: zpp - allocated znode
*
*/
void
zfs_mknode(znode_t *dzp, vattr_t *vap, dmu_tx_t *tx, cred_t *cr,
uint_t flag, znode_t **zpp, zfs_acl_ids_t *acl_ids)
{
uint64_t crtime[2], atime[2], mtime[2], ctime[2];
uint64_t mode, size, links, parent, pflags;
uint64_t dzp_pflags = 0;
uint64_t rdev = 0;
zfsvfs_t *zfsvfs = dzp->z_zfsvfs;
dmu_buf_t *db;
timestruc_t now;
uint64_t gen, obj;
int err;
int bonuslen;
int dnodesize;
sa_handle_t *sa_hdl;
dmu_object_type_t obj_type;
sa_bulk_attr_t *sa_attrs;
int cnt = 0;
zfs_acl_locator_cb_t locate = { 0 };
ASSERT3P(vap, !=, NULL);
ASSERT3U((vap->va_mask & AT_MODE), ==, AT_MODE);
if (zfsvfs->z_replay) {
obj = vap->va_nodeid;
now = vap->va_ctime; /* see zfs_replay_create() */
gen = vap->va_nblocks; /* ditto */
dnodesize = vap->va_fsid; /* ditto */
} else {
obj = 0;
vfs_timestamp(&now);
gen = dmu_tx_get_txg(tx);
dnodesize = dmu_objset_dnodesize(zfsvfs->z_os);
}
if (dnodesize == 0)
dnodesize = DNODE_MIN_SIZE;
obj_type = zfsvfs->z_use_sa ? DMU_OT_SA : DMU_OT_ZNODE;
bonuslen = (obj_type == DMU_OT_SA) ?
DN_BONUS_SIZE(dnodesize) : ZFS_OLD_ZNODE_PHYS_SIZE;
/*
* Create a new DMU object.
*/
/*
* There's currently no mechanism for pre-reading the blocks that will
* be needed to allocate a new object, so we accept the small chance
* that there will be an i/o error and we will fail one of the
* assertions below.
*/
if (vap->va_type == VDIR) {
if (zfsvfs->z_replay) {
VERIFY0(zap_create_claim_norm_dnsize(zfsvfs->z_os, obj,
zfsvfs->z_norm, DMU_OT_DIRECTORY_CONTENTS,
obj_type, bonuslen, dnodesize, tx));
} else {
obj = zap_create_norm_dnsize(zfsvfs->z_os,
zfsvfs->z_norm, DMU_OT_DIRECTORY_CONTENTS,
obj_type, bonuslen, dnodesize, tx);
}
} else {
if (zfsvfs->z_replay) {
VERIFY0(dmu_object_claim_dnsize(zfsvfs->z_os, obj,
DMU_OT_PLAIN_FILE_CONTENTS, 0,
obj_type, bonuslen, dnodesize, tx));
} else {
obj = dmu_object_alloc_dnsize(zfsvfs->z_os,
DMU_OT_PLAIN_FILE_CONTENTS, 0,
obj_type, bonuslen, dnodesize, tx);
}
}
ZFS_OBJ_HOLD_ENTER(zfsvfs, obj);
VERIFY0(sa_buf_hold(zfsvfs->z_os, obj, NULL, &db));
/*
* If this is the root, fix up the half-initialized parent pointer
* to reference the just-allocated physical data area.
*/
if (flag & IS_ROOT_NODE) {
dzp->z_id = obj;
} else {
dzp_pflags = dzp->z_pflags;
}
/*
* If parent is an xattr, so am I.
*/
if (dzp_pflags & ZFS_XATTR) {
flag |= IS_XATTR;
}
if (zfsvfs->z_use_fuids)
pflags = ZFS_ARCHIVE | ZFS_AV_MODIFIED;
else
pflags = 0;
if (vap->va_type == VDIR) {
size = 2; /* contents ("." and "..") */
links = (flag & (IS_ROOT_NODE | IS_XATTR)) ? 2 : 1;
} else {
size = links = 0;
}
if (vap->va_type == VBLK || vap->va_type == VCHR) {
rdev = zfs_expldev(vap->va_rdev);
}
parent = dzp->z_id;
mode = acl_ids->z_mode;
if (flag & IS_XATTR)
pflags |= ZFS_XATTR;
/*
* No execs denied will be determined when zfs_mode_compute() is called.
*/
pflags |= acl_ids->z_aclp->z_hints &
(ZFS_ACL_TRIVIAL|ZFS_INHERIT_ACE|ZFS_ACL_AUTO_INHERIT|
ZFS_ACL_DEFAULTED|ZFS_ACL_PROTECTED);
ZFS_TIME_ENCODE(&now, crtime);
ZFS_TIME_ENCODE(&now, ctime);
if (vap->va_mask & AT_ATIME) {
ZFS_TIME_ENCODE(&vap->va_atime, atime);
} else {
ZFS_TIME_ENCODE(&now, atime);
}
if (vap->va_mask & AT_MTIME) {
ZFS_TIME_ENCODE(&vap->va_mtime, mtime);
} else {
ZFS_TIME_ENCODE(&now, mtime);
}
/* Now add in all of the "SA" attributes */
VERIFY0(sa_handle_get_from_db(zfsvfs->z_os, db, NULL, SA_HDL_SHARED,
&sa_hdl));
/*
* Setup the array of attributes to be replaced/set on the new file
*
* order for DMU_OT_ZNODE is critical since it needs to be constructed
* in the old znode_phys_t format. Don't change this ordering
*/
sa_attrs = kmem_alloc(sizeof (sa_bulk_attr_t) * ZPL_END, KM_SLEEP);
if (obj_type == DMU_OT_ZNODE) {
SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_ATIME(zfsvfs),
NULL, &atime, 16);
SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_MTIME(zfsvfs),
NULL, &mtime, 16);
SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_CTIME(zfsvfs),
NULL, &ctime, 16);
SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_CRTIME(zfsvfs),
NULL, &crtime, 16);
SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_GEN(zfsvfs),
NULL, &gen, 8);
SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_MODE(zfsvfs),
NULL, &mode, 8);
SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_SIZE(zfsvfs),
NULL, &size, 8);
SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_PARENT(zfsvfs),
NULL, &parent, 8);
} else {
SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_MODE(zfsvfs),
NULL, &mode, 8);
SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_SIZE(zfsvfs),
NULL, &size, 8);
SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_GEN(zfsvfs),
NULL, &gen, 8);
SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_UID(zfsvfs),
NULL, &acl_ids->z_fuid, 8);
SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_GID(zfsvfs),
NULL, &acl_ids->z_fgid, 8);
SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_PARENT(zfsvfs),
NULL, &parent, 8);
SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_FLAGS(zfsvfs),
NULL, &pflags, 8);
SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_ATIME(zfsvfs),
NULL, &atime, 16);
SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_MTIME(zfsvfs),
NULL, &mtime, 16);
SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_CTIME(zfsvfs),
NULL, &ctime, 16);
SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_CRTIME(zfsvfs),
NULL, &crtime, 16);
}
SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_LINKS(zfsvfs), NULL, &links, 8);
if (obj_type == DMU_OT_ZNODE) {
SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_XATTR(zfsvfs), NULL,
&empty_xattr, 8);
}
if (obj_type == DMU_OT_ZNODE ||
(vap->va_type == VBLK || vap->va_type == VCHR)) {
SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_RDEV(zfsvfs),
NULL, &rdev, 8);
}
if (obj_type == DMU_OT_ZNODE) {
SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_FLAGS(zfsvfs),
NULL, &pflags, 8);
SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_UID(zfsvfs), NULL,
&acl_ids->z_fuid, 8);
SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_GID(zfsvfs), NULL,
&acl_ids->z_fgid, 8);
SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_PAD(zfsvfs), NULL, pad,
sizeof (uint64_t) * 4);
SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_ZNODE_ACL(zfsvfs), NULL,
&acl_phys, sizeof (zfs_acl_phys_t));
} else if (acl_ids->z_aclp->z_version >= ZFS_ACL_VERSION_FUID) {
SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_DACL_COUNT(zfsvfs), NULL,
&acl_ids->z_aclp->z_acl_count, 8);
locate.cb_aclp = acl_ids->z_aclp;
SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_DACL_ACES(zfsvfs),
zfs_acl_data_locator, &locate,
acl_ids->z_aclp->z_acl_bytes);
mode = zfs_mode_compute(mode, acl_ids->z_aclp, &pflags,
acl_ids->z_fuid, acl_ids->z_fgid);
}
VERIFY0(sa_replace_all_by_template(sa_hdl, sa_attrs, cnt, tx));
if (!(flag & IS_ROOT_NODE)) {
*zpp = zfs_znode_alloc(zfsvfs, db, 0, obj_type, sa_hdl);
ASSERT3P(*zpp, !=, NULL);
} else {
/*
* If we are creating the root node, the "parent" we
* passed in is the znode for the root.
*/
*zpp = dzp;
(*zpp)->z_sa_hdl = sa_hdl;
}
(*zpp)->z_pflags = pflags;
(*zpp)->z_mode = mode;
(*zpp)->z_dnodesize = dnodesize;
if (vap->va_mask & AT_XVATTR)
zfs_xvattr_set(*zpp, (xvattr_t *)vap, tx);
if (obj_type == DMU_OT_ZNODE ||
acl_ids->z_aclp->z_version < ZFS_ACL_VERSION_FUID) {
VERIFY0(zfs_aclset_common(*zpp, acl_ids->z_aclp, cr, tx));
}
if (!(flag & IS_ROOT_NODE)) {
vnode_t *vp;
vp = ZTOV(*zpp);
vp->v_vflag |= VV_FORCEINSMQ;
err = insmntque(vp, zfsvfs->z_vfs);
vp->v_vflag &= ~VV_FORCEINSMQ;
KASSERT(err == 0, ("insmntque() failed: error %d", err));
}
kmem_free(sa_attrs, sizeof (sa_bulk_attr_t) * ZPL_END);
ZFS_OBJ_HOLD_EXIT(zfsvfs, obj);
}
/*
* Update in-core attributes. It is assumed the caller will be doing an
* sa_bulk_update to push the changes out.
*/
void
zfs_xvattr_set(znode_t *zp, xvattr_t *xvap, dmu_tx_t *tx)
{
xoptattr_t *xoap;
xoap = xva_getxoptattr(xvap);
ASSERT3P(xoap, !=, NULL);
ASSERT_VOP_IN_SEQC(ZTOV(zp));
if (XVA_ISSET_REQ(xvap, XAT_CREATETIME)) {
uint64_t times[2];
ZFS_TIME_ENCODE(&xoap->xoa_createtime, times);
(void) sa_update(zp->z_sa_hdl, SA_ZPL_CRTIME(zp->z_zfsvfs),
&times, sizeof (times), tx);
XVA_SET_RTN(xvap, XAT_CREATETIME);
}
if (XVA_ISSET_REQ(xvap, XAT_READONLY)) {
ZFS_ATTR_SET(zp, ZFS_READONLY, xoap->xoa_readonly,
zp->z_pflags, tx);
XVA_SET_RTN(xvap, XAT_READONLY);
}
if (XVA_ISSET_REQ(xvap, XAT_HIDDEN)) {
ZFS_ATTR_SET(zp, ZFS_HIDDEN, xoap->xoa_hidden,
zp->z_pflags, tx);
XVA_SET_RTN(xvap, XAT_HIDDEN);
}
if (XVA_ISSET_REQ(xvap, XAT_SYSTEM)) {
ZFS_ATTR_SET(zp, ZFS_SYSTEM, xoap->xoa_system,
zp->z_pflags, tx);
XVA_SET_RTN(xvap, XAT_SYSTEM);
}
if (XVA_ISSET_REQ(xvap, XAT_ARCHIVE)) {
ZFS_ATTR_SET(zp, ZFS_ARCHIVE, xoap->xoa_archive,
zp->z_pflags, tx);
XVA_SET_RTN(xvap, XAT_ARCHIVE);
}
if (XVA_ISSET_REQ(xvap, XAT_IMMUTABLE)) {
ZFS_ATTR_SET(zp, ZFS_IMMUTABLE, xoap->xoa_immutable,
zp->z_pflags, tx);
XVA_SET_RTN(xvap, XAT_IMMUTABLE);
}
if (XVA_ISSET_REQ(xvap, XAT_NOUNLINK)) {
ZFS_ATTR_SET(zp, ZFS_NOUNLINK, xoap->xoa_nounlink,
zp->z_pflags, tx);
XVA_SET_RTN(xvap, XAT_NOUNLINK);
}
if (XVA_ISSET_REQ(xvap, XAT_APPENDONLY)) {
ZFS_ATTR_SET(zp, ZFS_APPENDONLY, xoap->xoa_appendonly,
zp->z_pflags, tx);
XVA_SET_RTN(xvap, XAT_APPENDONLY);
}
if (XVA_ISSET_REQ(xvap, XAT_NODUMP)) {
ZFS_ATTR_SET(zp, ZFS_NODUMP, xoap->xoa_nodump,
zp->z_pflags, tx);
XVA_SET_RTN(xvap, XAT_NODUMP);
}
if (XVA_ISSET_REQ(xvap, XAT_OPAQUE)) {
ZFS_ATTR_SET(zp, ZFS_OPAQUE, xoap->xoa_opaque,
zp->z_pflags, tx);
XVA_SET_RTN(xvap, XAT_OPAQUE);
}
if (XVA_ISSET_REQ(xvap, XAT_AV_QUARANTINED)) {
ZFS_ATTR_SET(zp, ZFS_AV_QUARANTINED,
xoap->xoa_av_quarantined, zp->z_pflags, tx);
XVA_SET_RTN(xvap, XAT_AV_QUARANTINED);
}
if (XVA_ISSET_REQ(xvap, XAT_AV_MODIFIED)) {
ZFS_ATTR_SET(zp, ZFS_AV_MODIFIED, xoap->xoa_av_modified,
zp->z_pflags, tx);
XVA_SET_RTN(xvap, XAT_AV_MODIFIED);
}
if (XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP)) {
zfs_sa_set_scanstamp(zp, xvap, tx);
XVA_SET_RTN(xvap, XAT_AV_SCANSTAMP);
}
if (XVA_ISSET_REQ(xvap, XAT_REPARSE)) {
ZFS_ATTR_SET(zp, ZFS_REPARSE, xoap->xoa_reparse,
zp->z_pflags, tx);
XVA_SET_RTN(xvap, XAT_REPARSE);
}
if (XVA_ISSET_REQ(xvap, XAT_OFFLINE)) {
ZFS_ATTR_SET(zp, ZFS_OFFLINE, xoap->xoa_offline,
zp->z_pflags, tx);
XVA_SET_RTN(xvap, XAT_OFFLINE);
}
if (XVA_ISSET_REQ(xvap, XAT_SPARSE)) {
ZFS_ATTR_SET(zp, ZFS_SPARSE, xoap->xoa_sparse,
zp->z_pflags, tx);
XVA_SET_RTN(xvap, XAT_SPARSE);
}
}
int
zfs_zget(zfsvfs_t *zfsvfs, uint64_t obj_num, znode_t **zpp)
{
dmu_object_info_t doi;
dmu_buf_t *db;
znode_t *zp;
vnode_t *vp;
sa_handle_t *hdl;
struct thread *td;
int locked;
int err;
td = curthread;
getnewvnode_reserve_();
again:
*zpp = NULL;
ZFS_OBJ_HOLD_ENTER(zfsvfs, obj_num);
err = sa_buf_hold(zfsvfs->z_os, obj_num, NULL, &db);
if (err) {
ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
getnewvnode_drop_reserve();
return (err);
}
dmu_object_info_from_db(db, &doi);
if (doi.doi_bonus_type != DMU_OT_SA &&
(doi.doi_bonus_type != DMU_OT_ZNODE ||
(doi.doi_bonus_type == DMU_OT_ZNODE &&
doi.doi_bonus_size < sizeof (znode_phys_t)))) {
sa_buf_rele(db, NULL);
ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
getnewvnode_drop_reserve();
return (SET_ERROR(EINVAL));
}
hdl = dmu_buf_get_user(db);
if (hdl != NULL) {
zp = sa_get_userdata(hdl);
/*
* Since "SA" does immediate eviction we
* should never find a sa handle that doesn't
* know about the znode.
*/
ASSERT3P(zp, !=, NULL);
ASSERT3U(zp->z_id, ==, obj_num);
if (zp->z_unlinked) {
err = SET_ERROR(ENOENT);
} else {
vp = ZTOV(zp);
/*
* Don't let the vnode disappear after
* ZFS_OBJ_HOLD_EXIT.
*/
VN_HOLD(vp);
*zpp = zp;
err = 0;
}
sa_buf_rele(db, NULL);
ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
if (err) {
getnewvnode_drop_reserve();
return (err);
}
locked = VOP_ISLOCKED(vp);
VI_LOCK(vp);
if (VN_IS_DOOMED(vp) && locked != LK_EXCLUSIVE) {
/*
* The vnode is doomed and this thread doesn't
* hold the exclusive lock on it, so the vnode
* must be being reclaimed by another thread.
* Otherwise the doomed vnode is being reclaimed
* by this thread and zfs_zget is called from
* ZIL internals.
*/
VI_UNLOCK(vp);
/*
* XXX vrele() locks the vnode when the last reference
* is dropped. Although in this case the vnode is
* doomed / dead and so no inactivation is required,
* the vnode lock is still acquired. That could result
* in a LOR with z_teardown_lock if another thread holds
* the vnode's lock and tries to take z_teardown_lock.
* But that is only possible if the other thread peforms
* a ZFS vnode operation on the vnode. That either
* should not happen if the vnode is dead or the thread
* should also have a reference to the vnode and thus
* our reference is not last.
*/
VN_RELE(vp);
goto again;
}
VI_UNLOCK(vp);
getnewvnode_drop_reserve();
return (err);
}
/*
* Not found create new znode/vnode
* but only if file exists.
*
* There is a small window where zfs_vget() could
* find this object while a file create is still in
* progress. This is checked for in zfs_znode_alloc()
*
* if zfs_znode_alloc() fails it will drop the hold on the
* bonus buffer.
*/
zp = zfs_znode_alloc(zfsvfs, db, doi.doi_data_block_size,
doi.doi_bonus_type, NULL);
if (zp == NULL) {
err = SET_ERROR(ENOENT);
} else {
*zpp = zp;
}
if (err == 0) {
vnode_t *vp = ZTOV(zp);
err = insmntque(vp, zfsvfs->z_vfs);
if (err == 0) {
vp->v_hash = obj_num;
VOP_UNLOCK1(vp);
} else {
zp->z_vnode = NULL;
zfs_znode_dmu_fini(zp);
zfs_znode_free(zp);
*zpp = NULL;
}
}
ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
getnewvnode_drop_reserve();
return (err);
}
int
zfs_rezget(znode_t *zp)
{
zfsvfs_t *zfsvfs = zp->z_zfsvfs;
dmu_object_info_t doi;
dmu_buf_t *db;
vnode_t *vp;
uint64_t obj_num = zp->z_id;
uint64_t mode, size;
sa_bulk_attr_t bulk[8];
int err;
int count = 0;
uint64_t gen;
/*
* Remove cached pages before reloading the znode, so that they are not
* lingering after we run into any error. Ideally, we should vgone()
* the vnode in case of error, but currently we cannot do that
* because of the LOR between the vnode lock and z_teardown_lock.
* So, instead, we have to "doom" the znode in the illumos style.
*/
vp = ZTOV(zp);
vn_pages_remove(vp, 0, 0);
ZFS_OBJ_HOLD_ENTER(zfsvfs, obj_num);
mutex_enter(&zp->z_acl_lock);
if (zp->z_acl_cached) {
zfs_acl_free(zp->z_acl_cached);
zp->z_acl_cached = NULL;
}
mutex_exit(&zp->z_acl_lock);
rw_enter(&zp->z_xattr_lock, RW_WRITER);
if (zp->z_xattr_cached) {
nvlist_free(zp->z_xattr_cached);
zp->z_xattr_cached = NULL;
}
rw_exit(&zp->z_xattr_lock);
ASSERT3P(zp->z_sa_hdl, ==, NULL);
err = sa_buf_hold(zfsvfs->z_os, obj_num, NULL, &db);
if (err) {
ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
return (err);
}
dmu_object_info_from_db(db, &doi);
if (doi.doi_bonus_type != DMU_OT_SA &&
(doi.doi_bonus_type != DMU_OT_ZNODE ||
(doi.doi_bonus_type == DMU_OT_ZNODE &&
doi.doi_bonus_size < sizeof (znode_phys_t)))) {
sa_buf_rele(db, NULL);
ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
return (SET_ERROR(EINVAL));
}
zfs_znode_sa_init(zfsvfs, zp, db, doi.doi_bonus_type, NULL);
size = zp->z_size;
/* reload cached values */
SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GEN(zfsvfs), NULL,
&gen, sizeof (gen));
SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs), NULL,
&zp->z_size, sizeof (zp->z_size));
SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs), NULL,
&zp->z_links, sizeof (zp->z_links));
SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL,
&zp->z_pflags, sizeof (zp->z_pflags));
SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ATIME(zfsvfs), NULL,
&zp->z_atime, sizeof (zp->z_atime));
SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_UID(zfsvfs), NULL,
&zp->z_uid, sizeof (zp->z_uid));
SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GID(zfsvfs), NULL,
&zp->z_gid, sizeof (zp->z_gid));
SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zfsvfs), NULL,
&mode, sizeof (mode));
if (sa_bulk_lookup(zp->z_sa_hdl, bulk, count)) {
zfs_znode_dmu_fini(zp);
ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
return (SET_ERROR(EIO));
}
zp->z_mode = mode;
if (gen != zp->z_gen) {
zfs_znode_dmu_fini(zp);
ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
return (SET_ERROR(EIO));
}
/*
* It is highly improbable but still quite possible that two
* objects in different datasets are created with the same
* object numbers and in transaction groups with the same
* numbers. znodes corresponding to those objects would
* have the same z_id and z_gen, but their other attributes
* may be different.
* zfs recv -F may replace one of such objects with the other.
* As a result file properties recorded in the replaced
* object's vnode may no longer match the received object's
* properties. At present the only cached property is the
* files type recorded in v_type.
* So, handle this case by leaving the old vnode and znode
* disassociated from the actual object. A new vnode and a
* znode will be created if the object is accessed
* (e.g. via a look-up). The old vnode and znode will be
* recycled when the last vnode reference is dropped.
*/
if (vp->v_type != IFTOVT((mode_t)zp->z_mode)) {
zfs_znode_dmu_fini(zp);
ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
return (SET_ERROR(EIO));
}
/*
* If the file has zero links, then it has been unlinked on the send
* side and it must be in the received unlinked set.
* We call zfs_znode_dmu_fini() now to prevent any accesses to the
* stale data and to prevent automatically removal of the file in
* zfs_zinactive(). The file will be removed either when it is removed
* on the send side and the next incremental stream is received or
* when the unlinked set gets processed.
*/
zp->z_unlinked = (zp->z_links == 0);
if (zp->z_unlinked) {
zfs_znode_dmu_fini(zp);
ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
return (0);
}
zp->z_blksz = doi.doi_data_block_size;
if (zp->z_size != size)
vnode_pager_setsize(vp, zp->z_size);
ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
return (0);
}
void
zfs_znode_delete(znode_t *zp, dmu_tx_t *tx)
{
zfsvfs_t *zfsvfs = zp->z_zfsvfs;
objset_t *os = zfsvfs->z_os;
uint64_t obj = zp->z_id;
uint64_t acl_obj = zfs_external_acl(zp);
ZFS_OBJ_HOLD_ENTER(zfsvfs, obj);
if (acl_obj) {
VERIFY(!zp->z_is_sa);
VERIFY0(dmu_object_free(os, acl_obj, tx));
}
VERIFY0(dmu_object_free(os, obj, tx));
zfs_znode_dmu_fini(zp);
ZFS_OBJ_HOLD_EXIT(zfsvfs, obj);
zfs_znode_free(zp);
}
void
zfs_zinactive(znode_t *zp)
{
zfsvfs_t *zfsvfs = zp->z_zfsvfs;
uint64_t z_id = zp->z_id;
ASSERT3P(zp->z_sa_hdl, !=, NULL);
/*
* Don't allow a zfs_zget() while were trying to release this znode
*/
ZFS_OBJ_HOLD_ENTER(zfsvfs, z_id);
/*
* If this was the last reference to a file with no links, remove
* the file from the file system unless the file system is mounted
* read-only. That can happen, for example, if the file system was
* originally read-write, the file was opened, then unlinked and
* the file system was made read-only before the file was finally
* closed. The file will remain in the unlinked set.
*/
if (zp->z_unlinked) {
ASSERT(!zfsvfs->z_issnap);
if ((zfsvfs->z_vfs->vfs_flag & VFS_RDONLY) == 0) {
ZFS_OBJ_HOLD_EXIT(zfsvfs, z_id);
zfs_rmnode(zp);
return;
}
}
zfs_znode_dmu_fini(zp);
ZFS_OBJ_HOLD_EXIT(zfsvfs, z_id);
zfs_znode_free(zp);
}
void
zfs_znode_free(znode_t *zp)
{
zfsvfs_t *zfsvfs = zp->z_zfsvfs;
#if __FreeBSD_version >= 1300139
char *symlink;
#endif
ASSERT3P(zp->z_sa_hdl, ==, NULL);
zp->z_vnode = NULL;
mutex_enter(&zfsvfs->z_znodes_lock);
POINTER_INVALIDATE(&zp->z_zfsvfs);
list_remove(&zfsvfs->z_all_znodes, zp);
zfsvfs->z_nr_znodes--;
mutex_exit(&zfsvfs->z_znodes_lock);
#if __FreeBSD_version >= 1300139
symlink = atomic_load_ptr(&zp->z_cached_symlink);
if (symlink != NULL) {
atomic_store_rel_ptr((uintptr_t *)&zp->z_cached_symlink,
(uintptr_t)NULL);
cache_symlink_free(symlink, strlen(symlink) + 1);
}
#endif
if (zp->z_acl_cached) {
zfs_acl_free(zp->z_acl_cached);
zp->z_acl_cached = NULL;
}
zfs_znode_free_kmem(zp);
}
void
zfs_tstamp_update_setup_ext(znode_t *zp, uint_t flag, uint64_t mtime[2],
uint64_t ctime[2], boolean_t have_tx)
{
timestruc_t now;
vfs_timestamp(&now);
if (have_tx) { /* will sa_bulk_update happen really soon? */
zp->z_atime_dirty = 0;
zp->z_seq++;
} else {
zp->z_atime_dirty = 1;
}
if (flag & AT_ATIME) {
ZFS_TIME_ENCODE(&now, zp->z_atime);
}
if (flag & AT_MTIME) {
ZFS_TIME_ENCODE(&now, mtime);
if (zp->z_zfsvfs->z_use_fuids) {
zp->z_pflags |= (ZFS_ARCHIVE |
ZFS_AV_MODIFIED);
}
}
if (flag & AT_CTIME) {
ZFS_TIME_ENCODE(&now, ctime);
if (zp->z_zfsvfs->z_use_fuids)
zp->z_pflags |= ZFS_ARCHIVE;
}
}
void
zfs_tstamp_update_setup(znode_t *zp, uint_t flag, uint64_t mtime[2],
uint64_t ctime[2])
{
zfs_tstamp_update_setup_ext(zp, flag, mtime, ctime, B_TRUE);
}
/*
* Grow the block size for a file.
*
* IN: zp - znode of file to free data in.
* size - requested block size
* tx - open transaction.
*
* NOTE: this function assumes that the znode is write locked.
*/
void
zfs_grow_blocksize(znode_t *zp, uint64_t size, dmu_tx_t *tx)
{
int error;
u_longlong_t dummy;
if (size <= zp->z_blksz)
return;
/*
* If the file size is already greater than the current blocksize,
* we will not grow. If there is more than one block in a file,
* the blocksize cannot change.
*/
if (zp->z_blksz && zp->z_size > zp->z_blksz)
return;
error = dmu_object_set_blocksize(zp->z_zfsvfs->z_os, zp->z_id,
size, 0, tx);
if (error == ENOTSUP)
return;
ASSERT0(error);
/* What blocksize did we actually get? */
dmu_object_size_from_db(sa_get_db(zp->z_sa_hdl), &zp->z_blksz, &dummy);
}
/*
* Increase the file length
*
* IN: zp - znode of file to free data in.
* end - new end-of-file
*
* RETURN: 0 on success, error code on failure
*/
static int
zfs_extend(znode_t *zp, uint64_t end)
{
zfsvfs_t *zfsvfs = zp->z_zfsvfs;
dmu_tx_t *tx;
zfs_locked_range_t *lr;
uint64_t newblksz;
int error;
/*
* We will change zp_size, lock the whole file.
*/
lr = zfs_rangelock_enter(&zp->z_rangelock, 0, UINT64_MAX, RL_WRITER);
/*
* Nothing to do if file already at desired length.
*/
if (end <= zp->z_size) {
zfs_rangelock_exit(lr);
return (0);
}
tx = dmu_tx_create(zfsvfs->z_os);
dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
zfs_sa_upgrade_txholds(tx, zp);
if (end > zp->z_blksz &&
(!ISP2(zp->z_blksz) || zp->z_blksz < zfsvfs->z_max_blksz)) {
/*
* We are growing the file past the current block size.
*/
if (zp->z_blksz > zp->z_zfsvfs->z_max_blksz) {
/*
* File's blocksize is already larger than the
* "recordsize" property. Only let it grow to
* the next power of 2.
*/
ASSERT(!ISP2(zp->z_blksz));
newblksz = MIN(end, 1 << highbit64(zp->z_blksz));
} else {
newblksz = MIN(end, zp->z_zfsvfs->z_max_blksz);
}
dmu_tx_hold_write(tx, zp->z_id, 0, newblksz);
} else {
newblksz = 0;
}
error = dmu_tx_assign(tx, TXG_WAIT);
if (error) {
dmu_tx_abort(tx);
zfs_rangelock_exit(lr);
return (error);
}
if (newblksz)
zfs_grow_blocksize(zp, newblksz, tx);
zp->z_size = end;
VERIFY0(sa_update(zp->z_sa_hdl, SA_ZPL_SIZE(zp->z_zfsvfs),
&zp->z_size, sizeof (zp->z_size), tx));
vnode_pager_setsize(ZTOV(zp), end);
zfs_rangelock_exit(lr);
dmu_tx_commit(tx);
return (0);
}
/*
* Free space in a file.
*
* IN: zp - znode of file to free data in.
* off - start of section to free.
* len - length of section to free.
*
* RETURN: 0 on success, error code on failure
*/
static int
zfs_free_range(znode_t *zp, uint64_t off, uint64_t len)
{
zfsvfs_t *zfsvfs = zp->z_zfsvfs;
zfs_locked_range_t *lr;
int error;
/*
* Lock the range being freed.
*/
lr = zfs_rangelock_enter(&zp->z_rangelock, off, len, RL_WRITER);
/*
* Nothing to do if file already at desired length.
*/
if (off >= zp->z_size) {
zfs_rangelock_exit(lr);
return (0);
}
if (off + len > zp->z_size)
len = zp->z_size - off;
error = dmu_free_long_range(zfsvfs->z_os, zp->z_id, off, len);
if (error == 0) {
/*
* In FreeBSD we cannot free block in the middle of a file,
* but only at the end of a file, so this code path should
* never happen.
*/
vnode_pager_setsize(ZTOV(zp), off);
}
zfs_rangelock_exit(lr);
return (error);
}
/*
* Truncate a file
*
* IN: zp - znode of file to free data in.
* end - new end-of-file.
*
* RETURN: 0 on success, error code on failure
*/
static int
zfs_trunc(znode_t *zp, uint64_t end)
{
zfsvfs_t *zfsvfs = zp->z_zfsvfs;
vnode_t *vp = ZTOV(zp);
dmu_tx_t *tx;
zfs_locked_range_t *lr;
int error;
sa_bulk_attr_t bulk[2];
int count = 0;
/*
* We will change zp_size, lock the whole file.
*/
lr = zfs_rangelock_enter(&zp->z_rangelock, 0, UINT64_MAX, RL_WRITER);
/*
* Nothing to do if file already at desired length.
*/
if (end >= zp->z_size) {
zfs_rangelock_exit(lr);
return (0);
}
error = dmu_free_long_range(zfsvfs->z_os, zp->z_id, end,
DMU_OBJECT_END);
if (error) {
zfs_rangelock_exit(lr);
return (error);
}
tx = dmu_tx_create(zfsvfs->z_os);
dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
zfs_sa_upgrade_txholds(tx, zp);
dmu_tx_mark_netfree(tx);
error = dmu_tx_assign(tx, TXG_WAIT);
if (error) {
dmu_tx_abort(tx);
zfs_rangelock_exit(lr);
return (error);
}
zp->z_size = end;
SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs),
NULL, &zp->z_size, sizeof (zp->z_size));
if (end == 0) {
zp->z_pflags &= ~ZFS_SPARSE;
SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs),
NULL, &zp->z_pflags, 8);
}
VERIFY0(sa_bulk_update(zp->z_sa_hdl, bulk, count, tx));
dmu_tx_commit(tx);
/*
* Clear any mapped pages in the truncated region. This has to
* happen outside of the transaction to avoid the possibility of
* a deadlock with someone trying to push a page that we are
* about to invalidate.
*/
vnode_pager_setsize(vp, end);
zfs_rangelock_exit(lr);
return (0);
}
/*
* Free space in a file
*
* IN: zp - znode of file to free data in.
* off - start of range
* len - end of range (0 => EOF)
* flag - current file open mode flags.
* log - TRUE if this action should be logged
*
* RETURN: 0 on success, error code on failure
*/
int
zfs_freesp(znode_t *zp, uint64_t off, uint64_t len, int flag, boolean_t log)
{
dmu_tx_t *tx;
zfsvfs_t *zfsvfs = zp->z_zfsvfs;
zilog_t *zilog = zfsvfs->z_log;
uint64_t mode;
uint64_t mtime[2], ctime[2];
sa_bulk_attr_t bulk[3];
int count = 0;
int error;
if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_MODE(zfsvfs), &mode,
sizeof (mode))) != 0)
return (error);
if (off > zp->z_size) {
error = zfs_extend(zp, off+len);
if (error == 0 && log)
goto log;
else
return (error);
}
if (len == 0) {
error = zfs_trunc(zp, off);
} else {
if ((error = zfs_free_range(zp, off, len)) == 0 &&
off + len > zp->z_size)
error = zfs_extend(zp, off+len);
}
if (error || !log)
return (error);
log:
tx = dmu_tx_create(zfsvfs->z_os);
dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE);
zfs_sa_upgrade_txholds(tx, zp);
error = dmu_tx_assign(tx, TXG_WAIT);
if (error) {
dmu_tx_abort(tx);
return (error);
}
SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL, mtime, 16);
SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL, ctime, 16);
SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs),
NULL, &zp->z_pflags, 8);
zfs_tstamp_update_setup(zp, CONTENT_MODIFIED, mtime, ctime);
error = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx);
ASSERT0(error);
zfs_log_truncate(zilog, tx, TX_TRUNCATE, zp, off, len);
dmu_tx_commit(tx);
return (0);
}
void
zfs_create_fs(objset_t *os, cred_t *cr, nvlist_t *zplprops, dmu_tx_t *tx)
{
uint64_t moid, obj, sa_obj, version;
uint64_t sense = ZFS_CASE_SENSITIVE;
uint64_t norm = 0;
nvpair_t *elem;
int error;
int i;
znode_t *rootzp = NULL;
zfsvfs_t *zfsvfs;
vattr_t vattr;
znode_t *zp;
zfs_acl_ids_t acl_ids;
/*
* First attempt to create master node.
*/
/*
* In an empty objset, there are no blocks to read and thus
* there can be no i/o errors (which we assert below).
*/
moid = MASTER_NODE_OBJ;
error = zap_create_claim(os, moid, DMU_OT_MASTER_NODE,
DMU_OT_NONE, 0, tx);
ASSERT0(error);
/*
* Set starting attributes.
*/
version = zfs_zpl_version_map(spa_version(dmu_objset_spa(os)));
elem = NULL;
while ((elem = nvlist_next_nvpair(zplprops, elem)) != NULL) {
/* For the moment we expect all zpl props to be uint64_ts */
uint64_t val;
char *name;
ASSERT3S(nvpair_type(elem), ==, DATA_TYPE_UINT64);
val = fnvpair_value_uint64(elem);
name = nvpair_name(elem);
if (strcmp(name, zfs_prop_to_name(ZFS_PROP_VERSION)) == 0) {
if (val < version)
version = val;
} else {
error = zap_update(os, moid, name, 8, 1, &val, tx);
}
ASSERT0(error);
if (strcmp(name, zfs_prop_to_name(ZFS_PROP_NORMALIZE)) == 0)
norm = val;
else if (strcmp(name, zfs_prop_to_name(ZFS_PROP_CASE)) == 0)
sense = val;
}
ASSERT3U(version, !=, 0);
error = zap_update(os, moid, ZPL_VERSION_STR, 8, 1, &version, tx);
/*
* Create zap object used for SA attribute registration
*/
if (version >= ZPL_VERSION_SA) {
sa_obj = zap_create(os, DMU_OT_SA_MASTER_NODE,
DMU_OT_NONE, 0, tx);
error = zap_add(os, moid, ZFS_SA_ATTRS, 8, 1, &sa_obj, tx);
ASSERT0(error);
} else {
sa_obj = 0;
}
/*
* Create a delete queue.
*/
obj = zap_create(os, DMU_OT_UNLINKED_SET, DMU_OT_NONE, 0, tx);
error = zap_add(os, moid, ZFS_UNLINKED_SET, 8, 1, &obj, tx);
ASSERT0(error);
/*
* Create root znode. Create minimal znode/vnode/zfsvfs
* to allow zfs_mknode to work.
*/
VATTR_NULL(&vattr);
vattr.va_mask = AT_MODE|AT_UID|AT_GID;
vattr.va_type = VDIR;
vattr.va_mode = S_IFDIR|0755;
vattr.va_uid = crgetuid(cr);
vattr.va_gid = crgetgid(cr);
zfsvfs = kmem_zalloc(sizeof (zfsvfs_t), KM_SLEEP);
rootzp = zfs_znode_alloc_kmem(KM_SLEEP);
ASSERT(!POINTER_IS_VALID(rootzp->z_zfsvfs));
rootzp->z_unlinked = 0;
rootzp->z_atime_dirty = 0;
rootzp->z_is_sa = USE_SA(version, os);
zfsvfs->z_os = os;
zfsvfs->z_parent = zfsvfs;
zfsvfs->z_version = version;
zfsvfs->z_use_fuids = USE_FUIDS(version, os);
zfsvfs->z_use_sa = USE_SA(version, os);
zfsvfs->z_norm = norm;
error = sa_setup(os, sa_obj, zfs_attr_table, ZPL_END,
&zfsvfs->z_attr_table);
ASSERT0(error);
/*
* Fold case on file systems that are always or sometimes case
* insensitive.
*/
if (sense == ZFS_CASE_INSENSITIVE || sense == ZFS_CASE_MIXED)
zfsvfs->z_norm |= U8_TEXTPREP_TOUPPER;
mutex_init(&zfsvfs->z_znodes_lock, NULL, MUTEX_DEFAULT, NULL);
list_create(&zfsvfs->z_all_znodes, sizeof (znode_t),
offsetof(znode_t, z_link_node));
for (i = 0; i != ZFS_OBJ_MTX_SZ; i++)
mutex_init(&zfsvfs->z_hold_mtx[i], NULL, MUTEX_DEFAULT, NULL);
rootzp->z_zfsvfs = zfsvfs;
VERIFY0(zfs_acl_ids_create(rootzp, IS_ROOT_NODE, &vattr,
cr, NULL, &acl_ids));
zfs_mknode(rootzp, &vattr, tx, cr, IS_ROOT_NODE, &zp, &acl_ids);
ASSERT3P(zp, ==, rootzp);
error = zap_add(os, moid, ZFS_ROOT_OBJ, 8, 1, &rootzp->z_id, tx);
ASSERT0(error);
zfs_acl_ids_free(&acl_ids);
POINTER_INVALIDATE(&rootzp->z_zfsvfs);
sa_handle_destroy(rootzp->z_sa_hdl);
zfs_znode_free_kmem(rootzp);
/*
* Create shares directory
*/
error = zfs_create_share_dir(zfsvfs, tx);
ASSERT0(error);
for (i = 0; i != ZFS_OBJ_MTX_SZ; i++)
mutex_destroy(&zfsvfs->z_hold_mtx[i]);
kmem_free(zfsvfs, sizeof (zfsvfs_t));
}
#endif /* _KERNEL */
static int
zfs_sa_setup(objset_t *osp, sa_attr_type_t **sa_table)
{
uint64_t sa_obj = 0;
int error;
error = zap_lookup(osp, MASTER_NODE_OBJ, ZFS_SA_ATTRS, 8, 1, &sa_obj);
if (error != 0 && error != ENOENT)
return (error);
error = sa_setup(osp, sa_obj, zfs_attr_table, ZPL_END, sa_table);
return (error);
}
static int
zfs_grab_sa_handle(objset_t *osp, uint64_t obj, sa_handle_t **hdlp,
dmu_buf_t **db, void *tag)
{
dmu_object_info_t doi;
int error;
if ((error = sa_buf_hold(osp, obj, tag, db)) != 0)
return (error);
dmu_object_info_from_db(*db, &doi);
if ((doi.doi_bonus_type != DMU_OT_SA &&
doi.doi_bonus_type != DMU_OT_ZNODE) ||
(doi.doi_bonus_type == DMU_OT_ZNODE &&
doi.doi_bonus_size < sizeof (znode_phys_t))) {
sa_buf_rele(*db, tag);
return (SET_ERROR(ENOTSUP));
}
error = sa_handle_get(osp, obj, NULL, SA_HDL_PRIVATE, hdlp);
if (error != 0) {
sa_buf_rele(*db, tag);
return (error);
}
return (0);
}
static void
zfs_release_sa_handle(sa_handle_t *hdl, dmu_buf_t *db, void *tag)
{
sa_handle_destroy(hdl);
sa_buf_rele(db, tag);
}
/*
* Given an object number, return its parent object number and whether
* or not the object is an extended attribute directory.
*/
static int
zfs_obj_to_pobj(objset_t *osp, sa_handle_t *hdl, sa_attr_type_t *sa_table,
uint64_t *pobjp, int *is_xattrdir)
{
uint64_t parent;
uint64_t pflags;
uint64_t mode;
uint64_t parent_mode;
sa_bulk_attr_t bulk[3];
sa_handle_t *sa_hdl;
dmu_buf_t *sa_db;
int count = 0;
int error;
SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_PARENT], NULL,
&parent, sizeof (parent));
SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_FLAGS], NULL,
&pflags, sizeof (pflags));
SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_MODE], NULL,
&mode, sizeof (mode));
if ((error = sa_bulk_lookup(hdl, bulk, count)) != 0)
return (error);
/*
* When a link is removed its parent pointer is not changed and will
* be invalid. There are two cases where a link is removed but the
* file stays around, when it goes to the delete queue and when there
* are additional links.
*/
error = zfs_grab_sa_handle(osp, parent, &sa_hdl, &sa_db, FTAG);
if (error != 0)
return (error);
error = sa_lookup(sa_hdl, ZPL_MODE, &parent_mode, sizeof (parent_mode));
zfs_release_sa_handle(sa_hdl, sa_db, FTAG);
if (error != 0)
return (error);
*is_xattrdir = ((pflags & ZFS_XATTR) != 0) && S_ISDIR(mode);
/*
* Extended attributes can be applied to files, directories, etc.
* Otherwise the parent must be a directory.
*/
if (!*is_xattrdir && !S_ISDIR(parent_mode))
return (SET_ERROR(EINVAL));
*pobjp = parent;
return (0);
}
/*
* Given an object number, return some zpl level statistics
*/
static int
zfs_obj_to_stats_impl(sa_handle_t *hdl, sa_attr_type_t *sa_table,
zfs_stat_t *sb)
{
sa_bulk_attr_t bulk[4];
int count = 0;
SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_MODE], NULL,
&sb->zs_mode, sizeof (sb->zs_mode));
SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_GEN], NULL,
&sb->zs_gen, sizeof (sb->zs_gen));
SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_LINKS], NULL,
&sb->zs_links, sizeof (sb->zs_links));
SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_CTIME], NULL,
&sb->zs_ctime, sizeof (sb->zs_ctime));
return (sa_bulk_lookup(hdl, bulk, count));
}
static int
zfs_obj_to_path_impl(objset_t *osp, uint64_t obj, sa_handle_t *hdl,
sa_attr_type_t *sa_table, char *buf, int len)
{
sa_handle_t *sa_hdl;
sa_handle_t *prevhdl = NULL;
dmu_buf_t *prevdb = NULL;
dmu_buf_t *sa_db = NULL;
char *path = buf + len - 1;
int error;
*path = '\0';
sa_hdl = hdl;
uint64_t deleteq_obj;
VERIFY0(zap_lookup(osp, MASTER_NODE_OBJ,
ZFS_UNLINKED_SET, sizeof (uint64_t), 1, &deleteq_obj));
error = zap_lookup_int(osp, deleteq_obj, obj);
if (error == 0) {
return (ESTALE);
} else if (error != ENOENT) {
return (error);
}
error = 0;
for (;;) {
uint64_t pobj;
char component[MAXNAMELEN + 2];
size_t complen;
int is_xattrdir;
if (prevdb) {
ASSERT3P(prevhdl, !=, NULL);
zfs_release_sa_handle(prevhdl, prevdb, FTAG);
}
if ((error = zfs_obj_to_pobj(osp, sa_hdl, sa_table, &pobj,
&is_xattrdir)) != 0)
break;
if (pobj == obj) {
if (path[0] != '/')
*--path = '/';
break;
}
component[0] = '/';
if (is_xattrdir) {
(void) sprintf(component + 1, "<xattrdir>");
} else {
error = zap_value_search(osp, pobj, obj,
ZFS_DIRENT_OBJ(-1ULL), component + 1);
if (error != 0)
break;
}
complen = strlen(component);
path -= complen;
ASSERT3P(path, >=, buf);
bcopy(component, path, complen);
obj = pobj;
if (sa_hdl != hdl) {
prevhdl = sa_hdl;
prevdb = sa_db;
}
error = zfs_grab_sa_handle(osp, obj, &sa_hdl, &sa_db, FTAG);
if (error != 0) {
sa_hdl = prevhdl;
sa_db = prevdb;
break;
}
}
if (sa_hdl != NULL && sa_hdl != hdl) {
ASSERT3P(sa_db, !=, NULL);
zfs_release_sa_handle(sa_hdl, sa_db, FTAG);
}
if (error == 0)
(void) memmove(buf, path, buf + len - path);
return (error);
}
int
zfs_obj_to_path(objset_t *osp, uint64_t obj, char *buf, int len)
{
sa_attr_type_t *sa_table;
sa_handle_t *hdl;
dmu_buf_t *db;
int error;
error = zfs_sa_setup(osp, &sa_table);
if (error != 0)
return (error);
error = zfs_grab_sa_handle(osp, obj, &hdl, &db, FTAG);
if (error != 0)
return (error);
error = zfs_obj_to_path_impl(osp, obj, hdl, sa_table, buf, len);
zfs_release_sa_handle(hdl, db, FTAG);
return (error);
}
int
zfs_obj_to_stats(objset_t *osp, uint64_t obj, zfs_stat_t *sb,
char *buf, int len)
{
char *path = buf + len - 1;
sa_attr_type_t *sa_table;
sa_handle_t *hdl;
dmu_buf_t *db;
int error;
*path = '\0';
error = zfs_sa_setup(osp, &sa_table);
if (error != 0)
return (error);
error = zfs_grab_sa_handle(osp, obj, &hdl, &db, FTAG);
if (error != 0)
return (error);
error = zfs_obj_to_stats_impl(hdl, sa_table, sb);
if (error != 0) {
zfs_release_sa_handle(hdl, db, FTAG);
return (error);
}
error = zfs_obj_to_path_impl(osp, obj, hdl, sa_table, buf, len);
zfs_release_sa_handle(hdl, db, FTAG);
return (error);
}
void
zfs_znode_update_vfs(znode_t *zp)
{
vm_object_t object;
if ((object = ZTOV(zp)->v_object) == NULL ||
zp->z_size == object->un_pager.vnp.vnp_size)
return;
vnode_pager_setsize(ZTOV(zp), zp->z_size);
}
#ifdef _KERNEL
int
zfs_znode_parent_and_name(znode_t *zp, znode_t **dzpp, char *buf)
{
zfsvfs_t *zfsvfs = zp->z_zfsvfs;
uint64_t parent;
int is_xattrdir;
int err;
/* Extended attributes should not be visible as regular files. */
if ((zp->z_pflags & ZFS_XATTR) != 0)
return (SET_ERROR(EINVAL));
err = zfs_obj_to_pobj(zfsvfs->z_os, zp->z_sa_hdl, zfsvfs->z_attr_table,
&parent, &is_xattrdir);
if (err != 0)
return (err);
ASSERT0(is_xattrdir);
/* No name as this is a root object. */
if (parent == zp->z_id)
return (SET_ERROR(EINVAL));
err = zap_value_search(zfsvfs->z_os, parent, zp->z_id,
ZFS_DIRENT_OBJ(-1ULL), buf);
if (err != 0)
return (err);
err = zfs_zget(zfsvfs, parent, dzpp);
return (err);
}
#endif /* _KERNEL */
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