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zfs/module/zfs/zfs_znode.c

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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.
*/
/* Portions Copyright 2007 Jeremy Teo */
#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/mkdev.h>
#include <sys/u8_textprep.h>
#include <sys/dsl_dataset.h>
#include <sys/vfs.h>
#include <sys/vfs_opreg.h>
#include <sys/vnode.h>
#include <sys/file.h>
#include <sys/kmem.h>
#include <sys/errno.h>
#include <sys/unistd.h>
#include <sys/mode.h>
#include <sys/atomic.h>
#include <vm/pvn.h>
#include "fs/fs_subr.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>
#include <sys/kidmap.h>
#endif /* _KERNEL */
#include <sys/dmu.h>
#include <sys/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 "zfs_prop.h"
#include "zfs_comutil.h"
/*
* Define ZNODE_STATS to turn on statistic gathering. By default, it is only
* turned on when DEBUG is also defined.
*/
#ifdef 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 */
#define POINTER_IS_VALID(p) (!((uintptr_t)(p) & 0x3))
#define POINTER_INVALIDATE(pp) (*(pp) = (void *)((uintptr_t)(*(pp)) | 0x1))
/*
* 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
#ifdef HAVE_ZPL
/*
* Needed to close a small window in zfs_znode_move() that allows the zfsvfs to
* be freed before it can be safely accessed.
*/
krwlock_t zfsvfs_lock;
static kmem_cache_t *znode_cache = NULL;
/*ARGSUSED*/
static void
znode_evict_error(dmu_buf_t *dbuf, void *user_ptr)
{
/*
* We should never drop all dbuf refs without first clearing
* the eviction callback.
*/
panic("evicting znode %p\n", user_ptr);
}
/*ARGSUSED*/
static int
zfs_znode_cache_constructor(void *buf, void *arg, int kmflags)
{
znode_t *zp = buf;
ASSERT(!POINTER_IS_VALID(zp->z_zfsvfs));
zp->z_vnode = vn_alloc(kmflags);
if (zp->z_vnode == NULL) {
return (-1);
}
ZTOV(zp)->v_data = zp;
list_link_init(&zp->z_link_node);
mutex_init(&zp->z_lock, NULL, MUTEX_DEFAULT, NULL);
rw_init(&zp->z_parent_lock, NULL, RW_DEFAULT, NULL);
rw_init(&zp->z_name_lock, NULL, RW_DEFAULT, NULL);
mutex_init(&zp->z_acl_lock, NULL, MUTEX_DEFAULT, NULL);
mutex_init(&zp->z_range_lock, NULL, MUTEX_DEFAULT, NULL);
avl_create(&zp->z_range_avl, zfs_range_compare,
sizeof (rl_t), offsetof(rl_t, r_node));
zp->z_dirlocks = NULL;
zp->z_acl_cached = 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));
ASSERT(ZTOV(zp)->v_data == zp);
vn_free(ZTOV(zp));
ASSERT(!list_link_active(&zp->z_link_node));
mutex_destroy(&zp->z_lock);
rw_destroy(&zp->z_parent_lock);
rw_destroy(&zp->z_name_lock);
mutex_destroy(&zp->z_acl_lock);
avl_destroy(&zp->z_range_avl);
mutex_destroy(&zp->z_range_lock);
ASSERT(zp->z_dirlocks == NULL);
ASSERT(zp->z_acl_cached == NULL);
}
#ifdef ZNODE_STATS
static struct {
uint64_t zms_zfsvfs_invalid;
uint64_t zms_zfsvfs_recheck1;
uint64_t zms_zfsvfs_unmounted;
uint64_t zms_zfsvfs_recheck2;
uint64_t zms_obj_held;
uint64_t zms_vnode_locked;
uint64_t zms_not_only_dnlc;
} znode_move_stats;
#endif /* ZNODE_STATS */
static void
zfs_znode_move_impl(znode_t *ozp, znode_t *nzp)
{
vnode_t *vp;
/* Copy fields. */
nzp->z_zfsvfs = ozp->z_zfsvfs;
/* Swap vnodes. */
vp = nzp->z_vnode;
nzp->z_vnode = ozp->z_vnode;
ozp->z_vnode = vp; /* let destructor free the overwritten vnode */
ZTOV(ozp)->v_data = ozp;
ZTOV(nzp)->v_data = nzp;
nzp->z_id = ozp->z_id;
ASSERT(ozp->z_dirlocks == NULL); /* znode not in use */
ASSERT(avl_numnodes(&ozp->z_range_avl) == 0);
nzp->z_unlinked = ozp->z_unlinked;
nzp->z_atime_dirty = ozp->z_atime_dirty;
nzp->z_zn_prefetch = ozp->z_zn_prefetch;
nzp->z_blksz = ozp->z_blksz;
nzp->z_seq = ozp->z_seq;
nzp->z_mapcnt = ozp->z_mapcnt;
nzp->z_last_itx = ozp->z_last_itx;
nzp->z_gen = ozp->z_gen;
nzp->z_sync_cnt = ozp->z_sync_cnt;
nzp->z_is_sa = ozp->z_is_sa;
nzp->z_sa_hdl = ozp->z_sa_hdl;
bcopy(ozp->z_atime, nzp->z_atime, sizeof (uint64_t) * 2);
nzp->z_links = ozp->z_links;
nzp->z_size = ozp->z_size;
nzp->z_pflags = ozp->z_pflags;
nzp->z_uid = ozp->z_uid;
nzp->z_gid = ozp->z_gid;
nzp->z_mode = ozp->z_mode;
/*
* Since this is just an idle znode and kmem is already dealing with
* memory pressure, release any cached ACL.
*/
if (ozp->z_acl_cached) {
zfs_acl_free(ozp->z_acl_cached);
ozp->z_acl_cached = NULL;
}
sa_set_userp(nzp->z_sa_hdl, nzp);
/*
* Invalidate the original znode by clearing fields that provide a
* pointer back to the znode. Set the low bit of the vfs pointer to
* ensure that zfs_znode_move() recognizes the znode as invalid in any
* subsequent callback.
*/
ozp->z_sa_hdl = NULL;
POINTER_INVALIDATE(&ozp->z_zfsvfs);
}
/*ARGSUSED*/
static kmem_cbrc_t
zfs_znode_move(void *buf, void *newbuf, size_t size, void *arg)
{
znode_t *ozp = buf, *nzp = newbuf;
zfsvfs_t *zfsvfs;
vnode_t *vp;
/*
* The znode is on the file system's list of known znodes if the vfs
* pointer is valid. We set the low bit of the vfs pointer when freeing
* the znode to invalidate it, and the memory patterns written by kmem
* (baddcafe and deadbeef) set at least one of the two low bits. A newly
* created znode sets the vfs pointer last of all to indicate that the
* znode is known and in a valid state to be moved by this function.
*/
zfsvfs = ozp->z_zfsvfs;
if (!POINTER_IS_VALID(zfsvfs)) {
ZNODE_STAT_ADD(znode_move_stats.zms_zfsvfs_invalid);
return (KMEM_CBRC_DONT_KNOW);
}
/*
* Close a small window in which it's possible that the filesystem could
* be unmounted and freed, and zfsvfs, though valid in the previous
* statement, could point to unrelated memory by the time we try to
* prevent the filesystem from being unmounted.
*/
rw_enter(&zfsvfs_lock, RW_WRITER);
if (zfsvfs != ozp->z_zfsvfs) {
rw_exit(&zfsvfs_lock);
ZNODE_STAT_ADD(znode_move_stats.zms_zfsvfs_recheck1);
return (KMEM_CBRC_DONT_KNOW);
}
/*
* If the znode is still valid, then so is the file system. We know that
* no valid file system can be freed while we hold zfsvfs_lock, so we
* can safely ensure that the filesystem is not and will not be
* unmounted. The next statement is equivalent to ZFS_ENTER().
*/
rrw_enter(&zfsvfs->z_teardown_lock, RW_READER, FTAG);
if (zfsvfs->z_unmounted) {
ZFS_EXIT(zfsvfs);
rw_exit(&zfsvfs_lock);
ZNODE_STAT_ADD(znode_move_stats.zms_zfsvfs_unmounted);
return (KMEM_CBRC_DONT_KNOW);
}
rw_exit(&zfsvfs_lock);
mutex_enter(&zfsvfs->z_znodes_lock);
/*
* Recheck the vfs pointer in case the znode was removed just before
* acquiring the lock.
*/
if (zfsvfs != ozp->z_zfsvfs) {
mutex_exit(&zfsvfs->z_znodes_lock);
ZFS_EXIT(zfsvfs);
ZNODE_STAT_ADD(znode_move_stats.zms_zfsvfs_recheck2);
return (KMEM_CBRC_DONT_KNOW);
}
/*
* At this point we know that as long as we hold z_znodes_lock, the
* znode cannot be freed and fields within the znode can be safely
* accessed. Now, prevent a race with zfs_zget().
*/
if (ZFS_OBJ_HOLD_TRYENTER(zfsvfs, ozp->z_id) == 0) {
mutex_exit(&zfsvfs->z_znodes_lock);
ZFS_EXIT(zfsvfs);
ZNODE_STAT_ADD(znode_move_stats.zms_obj_held);
return (KMEM_CBRC_LATER);
}
vp = ZTOV(ozp);
if (mutex_tryenter(&vp->v_lock) == 0) {
ZFS_OBJ_HOLD_EXIT(zfsvfs, ozp->z_id);
mutex_exit(&zfsvfs->z_znodes_lock);
ZFS_EXIT(zfsvfs);
ZNODE_STAT_ADD(znode_move_stats.zms_vnode_locked);
return (KMEM_CBRC_LATER);
}
/* Only move znodes that are referenced _only_ by the DNLC. */
if (vp->v_count != 1 || !vn_in_dnlc(vp)) {
mutex_exit(&vp->v_lock);
ZFS_OBJ_HOLD_EXIT(zfsvfs, ozp->z_id);
mutex_exit(&zfsvfs->z_znodes_lock);
ZFS_EXIT(zfsvfs);
ZNODE_STAT_ADD(znode_move_stats.zms_not_only_dnlc);
return (KMEM_CBRC_LATER);
}
/*
* The znode is known and in a valid state to move. We're holding the
* locks needed to execute the critical section.
*/
zfs_znode_move_impl(ozp, nzp);
mutex_exit(&vp->v_lock);
ZFS_OBJ_HOLD_EXIT(zfsvfs, ozp->z_id);
list_link_replace(&ozp->z_link_node, &nzp->z_link_node);
mutex_exit(&zfsvfs->z_znodes_lock);
ZFS_EXIT(zfsvfs);
return (KMEM_CBRC_YES);
}
void
zfs_znode_init(void)
{
/*
* Initialize zcache
*/
rw_init(&zfsvfs_lock, NULL, RW_DEFAULT, NULL);
ASSERT(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);
kmem_cache_set_move(znode_cache, zfs_znode_move);
}
void
zfs_znode_fini(void)
{
/*
* Cleanup vfs & vnode ops
*/
zfs_remove_op_tables();
/*
* Cleanup zcache
*/
if (znode_cache)
kmem_cache_destroy(znode_cache);
znode_cache = NULL;
rw_destroy(&zfsvfs_lock);
}
struct vnodeops *zfs_dvnodeops;
struct vnodeops *zfs_fvnodeops;
struct vnodeops *zfs_symvnodeops;
struct vnodeops *zfs_xdvnodeops;
struct vnodeops *zfs_evnodeops;
struct vnodeops *zfs_sharevnodeops;
void
zfs_remove_op_tables()
{
/*
* Remove vfs ops
*/
ASSERT(zfsfstype);
(void) vfs_freevfsops_by_type(zfsfstype);
zfsfstype = 0;
/*
* Remove vnode ops
*/
if (zfs_dvnodeops)
vn_freevnodeops(zfs_dvnodeops);
if (zfs_fvnodeops)
vn_freevnodeops(zfs_fvnodeops);
if (zfs_symvnodeops)
vn_freevnodeops(zfs_symvnodeops);
if (zfs_xdvnodeops)
vn_freevnodeops(zfs_xdvnodeops);
if (zfs_evnodeops)
vn_freevnodeops(zfs_evnodeops);
if (zfs_sharevnodeops)
vn_freevnodeops(zfs_sharevnodeops);
zfs_dvnodeops = NULL;
zfs_fvnodeops = NULL;
zfs_symvnodeops = NULL;
zfs_xdvnodeops = NULL;
zfs_evnodeops = NULL;
zfs_sharevnodeops = NULL;
}
extern const fs_operation_def_t zfs_dvnodeops_template[];
extern const fs_operation_def_t zfs_fvnodeops_template[];
extern const fs_operation_def_t zfs_xdvnodeops_template[];
extern const fs_operation_def_t zfs_symvnodeops_template[];
extern const fs_operation_def_t zfs_evnodeops_template[];
extern const fs_operation_def_t zfs_sharevnodeops_template[];
int
zfs_create_op_tables()
{
int error;
/*
* zfs_dvnodeops can be set if mod_remove() calls mod_installfs()
* due to a failure to remove the the 2nd modlinkage (zfs_modldrv).
* In this case we just return as the ops vectors are already set up.
*/
if (zfs_dvnodeops)
return (0);
error = vn_make_ops(MNTTYPE_ZFS, zfs_dvnodeops_template,
&zfs_dvnodeops);
if (error)
return (error);
error = vn_make_ops(MNTTYPE_ZFS, zfs_fvnodeops_template,
&zfs_fvnodeops);
if (error)
return (error);
error = vn_make_ops(MNTTYPE_ZFS, zfs_symvnodeops_template,
&zfs_symvnodeops);
if (error)
return (error);
error = vn_make_ops(MNTTYPE_ZFS, zfs_xdvnodeops_template,
&zfs_xdvnodeops);
if (error)
return (error);
error = vn_make_ops(MNTTYPE_ZFS, zfs_evnodeops_template,
&zfs_evnodeops);
if (error)
return (error);
error = vn_make_ops(MNTTYPE_ZFS, zfs_sharevnodeops_template,
&zfs_sharevnodeops);
return (error);
}
int
zfs_create_share_dir(zfsvfs_t *zfsvfs, dmu_tx_t *tx)
{
zfs_acl_ids_t acl_ids;
vattr_t vattr;
znode_t *sharezp;
vnode_t *vp;
znode_t *zp;
int error;
vattr.va_mask = AT_MODE|AT_UID|AT_GID|AT_TYPE;
vattr.va_type = VDIR;
vattr.va_mode = S_IFDIR|0555;
vattr.va_uid = crgetuid(kcred);
vattr.va_gid = crgetgid(kcred);
sharezp = kmem_cache_alloc(znode_cache, KM_SLEEP);
sharezp->z_unlinked = 0;
sharezp->z_atime_dirty = 0;
sharezp->z_zfsvfs = zfsvfs;
sharezp->z_is_sa = zfsvfs->z_use_sa;
vp = ZTOV(sharezp);
vn_reinit(vp);
vp->v_type = VDIR;
VERIFY(0 == 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);
ASSERT(!vn_in_dnlc(ZTOV(sharezp))); /* not valid to move */
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);
ZTOV(sharezp)->v_count = 0;
sa_handle_destroy(sharezp->z_sa_hdl);
kmem_cache_free(znode_cache, 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)
{
#ifndef _LP64
major_t major = (major_t)dev >> NBITSMINOR32 & MAXMAJ32;
return (((uint64_t)major << NBITSMINOR64) |
((minor_t)dev & MAXMIN32));
#else
return (dev);
#endif
}
/*
* 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)
{
#ifndef _LP64
minor_t minor = (minor_t)dev & MAXMIN64;
major_t major = (major_t)(dev >> NBITSMINOR64) & MAXMAJ64;
if (major > MAXMAJ32 || minor > MAXMIN32)
return (NODEV32);
return (((dev32_t)major << NBITSMINOR32) | minor);
#else
return (dev);
#endif
}
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)));
mutex_enter(&zp->z_lock);
ASSERT(zp->z_sa_hdl == NULL);
ASSERT(zp->z_acl_cached == NULL);
if (sa_hdl == NULL) {
VERIFY(0 == 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
*/
if (zp->z_id == zfsvfs->z_root)
ZTOV(zp)->v_flag |= VROOT;
mutex_exit(&zp->z_lock);
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 ||
RW_WRITE_HELD(&zp->z_zfsvfs->z_teardown_inactive_lock));
sa_handle_destroy(zp->z_sa_hdl);
zp->z_sa_hdl = NULL;
}
/*
* Construct a new znode/vnode and intialize.
*
* 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;
uint64_t uid, gid;
sa_bulk_attr_t bulk[9];
int count = 0;
zp = kmem_cache_alloc(znode_cache, KM_SLEEP);
ASSERT(zp->z_dirlocks == NULL);
ASSERT(!POINTER_IS_VALID(zp->z_zfsvfs));
/*
* Defer setting z_zfsvfs until the znode is ready to be a candidate for
* the zfs_znode_move() callback.
*/
zp->z_sa_hdl = NULL;
zp->z_unlinked = 0;
zp->z_atime_dirty = 0;
zp->z_mapcnt = 0;
zp->z_last_itx = 0;
zp->z_id = db->db_object;
zp->z_blksz = blksz;
zp->z_seq = 0x7A4653;
zp->z_sync_cnt = 0;
vp = ZTOV(zp);
vn_reinit(vp);
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);
SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_UID(zfsvfs), NULL,
&uid, 8);
SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GID(zfsvfs), NULL,
&gid, 8);
if (sa_bulk_lookup(zp->z_sa_hdl, bulk, count) != 0 || zp->z_gen == 0) {
if (hdl == NULL)
sa_handle_destroy(zp->z_sa_hdl);
kmem_cache_free(znode_cache, zp);
return (NULL);
}
zp->z_uid = zfs_fuid_map_id(zfsvfs, uid, CRED(), ZFS_OWNER);
zp->z_gid = zfs_fuid_map_id(zfsvfs, gid, CRED(), ZFS_GROUP);
zp->z_mode = mode;
vp->v_vfsp = zfsvfs->z_parent->z_vfs;
vp->v_type = IFTOVT((mode_t)mode);
switch (vp->v_type) {
case VDIR:
if (zp->z_pflags & ZFS_XATTR) {
vn_setops(vp, zfs_xdvnodeops);
vp->v_flag |= V_XATTRDIR;
} else {
vn_setops(vp, zfs_dvnodeops);
}
zp->z_zn_prefetch = B_TRUE; /* z_prefetch default is enabled */
break;
case VBLK:
case VCHR:
{
uint64_t rdev;
VERIFY(sa_lookup(zp->z_sa_hdl, SA_ZPL_RDEV(zfsvfs),
&rdev, sizeof (rdev)) == 0);
vp->v_rdev = zfs_cmpldev(rdev);
}
/*FALLTHROUGH*/
case VFIFO:
case VSOCK:
case VDOOR:
vn_setops(vp, zfs_fvnodeops);
break;
case VREG:
vp->v_flag |= VMODSORT;
if (parent == zfsvfs->z_shares_dir) {
ASSERT(uid == 0 && gid == 0);
vn_setops(vp, zfs_sharevnodeops);
} else {
vn_setops(vp, zfs_fvnodeops);
}
break;
case VLNK:
vn_setops(vp, zfs_symvnodeops);
break;
default:
vn_setops(vp, zfs_evnodeops);
break;
}
mutex_enter(&zfsvfs->z_znodes_lock);
list_insert_tail(&zfsvfs->z_all_znodes, zp);
membar_producer();
/*
* Everything else must be valid before assigning z_zfsvfs makes the
* znode eligible for zfs_znode_move().
*/
zp->z_zfsvfs = zfsvfs;
mutex_exit(&zfsvfs->z_znodes_lock);
VFS_HOLD(zfsvfs->z_vfs);
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;
sa_handle_t *sa_hdl;
dmu_object_type_t obj_type;
sa_bulk_attr_t sa_attrs[ZPL_END];
int cnt = 0;
zfs_acl_locator_cb_t locate = { 0 };
ASSERT(vap && (vap->va_mask & (AT_TYPE|AT_MODE)) == (AT_TYPE|AT_MODE));
if (zfsvfs->z_replay) {
obj = vap->va_nodeid;
now = vap->va_ctime; /* see zfs_replay_create() */
gen = vap->va_nblocks; /* ditto */
} else {
obj = 0;
gethrestime(&now);
gen = dmu_tx_get_txg(tx);
}
obj_type = zfsvfs->z_use_sa ? DMU_OT_SA : DMU_OT_ZNODE;
bonuslen = (obj_type == DMU_OT_SA) ?
DN_MAX_BONUSLEN : ZFS_OLD_ZNODE_PHYS_SIZE;
/*
* Create a new DMU object.
*/
/*
* There's currently no mechanism for pre-reading the blocks that will
* be to needed 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) {
err = zap_create_claim_norm(zfsvfs->z_os, obj,
zfsvfs->z_norm, DMU_OT_DIRECTORY_CONTENTS,
obj_type, bonuslen, tx);
ASSERT3U(err, ==, 0);
} else {
obj = zap_create_norm(zfsvfs->z_os,
zfsvfs->z_norm, DMU_OT_DIRECTORY_CONTENTS,
obj_type, bonuslen, tx);
}
} else {
if (zfsvfs->z_replay) {
err = dmu_object_claim(zfsvfs->z_os, obj,
DMU_OT_PLAIN_FILE_CONTENTS, 0,
obj_type, bonuslen, tx);
ASSERT3U(err, ==, 0);
} else {
obj = dmu_object_alloc(zfsvfs->z_os,
DMU_OT_PLAIN_FILE_CONTENTS, 0,
obj_type, bonuslen, tx);
}
}
ZFS_OBJ_HOLD_ENTER(zfsvfs, obj);
VERIFY(0 == 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 deterimed 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 */
VERIFY(0 == 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
*/
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);
}
VERIFY(sa_replace_all_by_template(sa_hdl, sa_attrs, cnt, tx) == 0);
if (!(flag & IS_ROOT_NODE)) {
*zpp = zfs_znode_alloc(zfsvfs, db, 0, obj_type, sa_hdl);
ASSERT(*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;
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) {
err = zfs_aclset_common(*zpp, acl_ids->z_aclp, cr, tx);
ASSERT3P(err, ==, 0);
}
ZFS_OBJ_HOLD_EXIT(zfsvfs, obj);
}
/*
* zfs_xvattr_set only updates the 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);
ASSERT(xoap);
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);
}
}
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;
int err;
sa_handle_t *hdl;
*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);
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 (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);
mutex_enter(&zp->z_lock);
ASSERT3U(zp->z_id, ==, obj_num);
if (zp->z_unlinked) {
err = ENOENT;
} else {
VN_HOLD(ZTOV(zp));
*zpp = zp;
err = 0;
}
sa_buf_rele(db, NULL);
mutex_exit(&zp->z_lock);
ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
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 = ENOENT;
} else {
*zpp = zp;
}
ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
return (err);
}
int
zfs_rezget(znode_t *zp)
{
zfsvfs_t *zfsvfs = zp->z_zfsvfs;
dmu_object_info_t doi;
dmu_buf_t *db;
uint64_t obj_num = zp->z_id;
uint64_t mode;
uint64_t uid, gid;
sa_bulk_attr_t bulk[8];
int err;
int count = 0;
uint64_t gen;
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);
ASSERT(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 (EINVAL);
}
zfs_znode_sa_init(zfsvfs, zp, db, doi.doi_bonus_type, NULL);
/* 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,
&uid, sizeof (uid));
SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GID(zfsvfs), NULL,
&gid, sizeof (gid));
SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zfsvfs), NULL,
&mode, sizeof (mode));
zp->z_mode = mode;
if (sa_bulk_lookup(zp->z_sa_hdl, bulk, count)) {
zfs_znode_dmu_fini(zp);
ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
return (EIO);
}
if (gen != zp->z_gen) {
zfs_znode_dmu_fini(zp);
ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
return (EIO);
}
zp->z_uid = zfs_fuid_map_id(zfsvfs, uid, CRED(), ZFS_OWNER);
zp->z_gid = zfs_fuid_map_id(zfsvfs, gid, CRED(), ZFS_GROUP);
zp->z_unlinked = (zp->z_links == 0);
zp->z_blksz = doi.doi_data_block_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(0 == dmu_object_free(os, acl_obj, tx));
VERIFY(0 == 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)
{
vnode_t *vp = ZTOV(zp);
zfsvfs_t *zfsvfs = zp->z_zfsvfs;
uint64_t z_id = zp->z_id;
ASSERT(zp->z_sa_hdl);
/*
* Don't allow a zfs_zget() while were trying to release this znode
*/
ZFS_OBJ_HOLD_ENTER(zfsvfs, z_id);
mutex_enter(&zp->z_lock);
mutex_enter(&vp->v_lock);
vp->v_count--;
if (vp->v_count > 0 || vn_has_cached_data(vp)) {
/*
* If the hold count is greater than zero, somebody has
* obtained a new reference on this znode while we were
* processing it here, so we are done. If we still have
* mapped pages then we are also done, since we don't
* want to inactivate the znode until the pages get pushed.
*
* XXX - if vn_has_cached_data(vp) is true, but count == 0,
* this seems like it would leave the znode hanging with
* no chance to go inactive...
*/
mutex_exit(&vp->v_lock);
mutex_exit(&zp->z_lock);
ZFS_OBJ_HOLD_EXIT(zfsvfs, z_id);
return;
}
mutex_exit(&vp->v_lock);
/*
* If this was the last reference to a file with no links,
* remove the file from the file system.
*/
if (zp->z_unlinked) {
mutex_exit(&zp->z_lock);
ZFS_OBJ_HOLD_EXIT(zfsvfs, z_id);
zfs_rmnode(zp);
return;
}
mutex_exit(&zp->z_lock);
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;
vn_invalid(ZTOV(zp));
ASSERT(ZTOV(zp)->v_count == 0);
mutex_enter(&zfsvfs->z_znodes_lock);
POINTER_INVALIDATE(&zp->z_zfsvfs);
list_remove(&zfsvfs->z_all_znodes, zp);
mutex_exit(&zfsvfs->z_znodes_lock);
if (zp->z_acl_cached) {
zfs_acl_free(zp->z_acl_cached);
zp->z_acl_cached = NULL;
}
kmem_cache_free(znode_cache, zp);
VFS_RELE(zfsvfs->z_vfs);
}
void
zfs_tstamp_update_setup(znode_t *zp, uint_t flag, uint64_t mtime[2],
uint64_t ctime[2], boolean_t have_tx)
{
timestruc_t now;
gethrestime(&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;
}
}
/*
* 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;
ASSERT3U(error, ==, 0);
/* What blocksize did we actually get? */
dmu_object_size_from_db(sa_get_db(zp->z_sa_hdl), &zp->z_blksz, &dummy);
}
/*
* This is a dummy interface used when pvn_vplist_dirty() should *not*
* be calling back into the fs for a putpage(). E.g.: when truncating
* a file, the pages being "thrown away* don't need to be written out.
*/
/* ARGSUSED */
static int
zfs_no_putpage(vnode_t *vp, page_t *pp, u_offset_t *offp, size_t *lenp,
int flags, cred_t *cr)
{
ASSERT(0);
return (0);
}
/*
* Increase the file length
*
* IN: zp - znode of file to free data in.
* end - new end-of-file
*
* RETURN: 0 if success
* error code if failure
*/
static int
zfs_extend(znode_t *zp, uint64_t end)
{
zfsvfs_t *zfsvfs = zp->z_zfsvfs;
dmu_tx_t *tx;
rl_t *rl;
uint64_t newblksz;
int error;
/*
* We will change zp_size, lock the whole file.
*/
rl = zfs_range_lock(zp, 0, UINT64_MAX, RL_WRITER);
/*
* Nothing to do if file already at desired length.
*/
if (end <= zp->z_size) {
zfs_range_unlock(rl);
return (0);
}
top:
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) {
ASSERT(!ISP2(zp->z_blksz));
newblksz = MIN(end, SPA_MAXBLOCKSIZE);
} 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_NOWAIT);
if (error) {
if (error == ERESTART) {
dmu_tx_wait(tx);
dmu_tx_abort(tx);
goto top;
}
dmu_tx_abort(tx);
zfs_range_unlock(rl);
return (error);
}
if (newblksz)
zfs_grow_blocksize(zp, newblksz, tx);
zp->z_size = end;
VERIFY(0 == sa_update(zp->z_sa_hdl, SA_ZPL_SIZE(zp->z_zfsvfs),
&zp->z_size, sizeof (zp->z_size), tx));
zfs_range_unlock(rl);
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 if success
* error code if failure
*/
static int
zfs_free_range(znode_t *zp, uint64_t off, uint64_t len)
{
zfsvfs_t *zfsvfs = zp->z_zfsvfs;
rl_t *rl;
int error;
/*
* Lock the range being freed.
*/
rl = zfs_range_lock(zp, off, len, RL_WRITER);
/*
* Nothing to do if file already at desired length.
*/
if (off >= zp->z_size) {
zfs_range_unlock(rl);
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);
zfs_range_unlock(rl);
return (error);
}
/*
* Truncate a file
*
* IN: zp - znode of file to free data in.
* end - new end-of-file.
*
* RETURN: 0 if success
* error code if 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;
rl_t *rl;
int error;
/*
* We will change zp_size, lock the whole file.
*/
rl = zfs_range_lock(zp, 0, UINT64_MAX, RL_WRITER);
/*
* Nothing to do if file already at desired length.
*/
if (end >= zp->z_size) {
zfs_range_unlock(rl);
return (0);
}
error = dmu_free_long_range(zfsvfs->z_os, zp->z_id, end, -1);
if (error) {
zfs_range_unlock(rl);
return (error);
}
top:
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_NOWAIT);
if (error) {
if (error == ERESTART) {
dmu_tx_wait(tx);
dmu_tx_abort(tx);
goto top;
}
dmu_tx_abort(tx);
zfs_range_unlock(rl);
return (error);
}
zp->z_size = end;
VERIFY(0 == sa_update(zp->z_sa_hdl, SA_ZPL_SIZE(zp->z_zfsvfs),
&zp->z_size, sizeof (zp->z_size), 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.
*/
if (vn_has_cached_data(vp)) {
page_t *pp;
uint64_t start = end & PAGEMASK;
int poff = end & PAGEOFFSET;
if (poff != 0 && (pp = page_lookup(vp, start, SE_SHARED))) {
/*
* We need to zero a partial page.
*/
pagezero(pp, poff, PAGESIZE - poff);
start += PAGESIZE;
page_unlock(pp);
}
error = pvn_vplist_dirty(vp, start, zfs_no_putpage,
B_INVAL | B_TRUNC, NULL);
ASSERT(error == 0);
}
zfs_range_unlock(rl);
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 if success
* error code if failure
*/
int
zfs_freesp(znode_t *zp, uint64_t off, uint64_t len, int flag, boolean_t log)
{
vnode_t *vp = ZTOV(zp);
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);
}
/*
* Check for any locks in the region to be freed.
*/
if (MANDLOCK(vp, (mode_t)mode)) {
uint64_t length = (len ? len : zp->z_size - off);
if (error = chklock(vp, FWRITE, off, length, flag, NULL))
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_NOWAIT);
if (error) {
if (error == ERESTART) {
dmu_tx_wait(tx);
dmu_tx_abort(tx);
goto log;
}
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, B_TRUE);
error = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx);
ASSERT(error == 0);
zfs_log_truncate(zilog, tx, TX_TRUNCATE, zp, off, len);
dmu_tx_commit(tx);
return (0);
}
#endif /* HAVE_ZPL */
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;
#ifdef HAVE_ZPL
zfsvfs_t zfsvfs;
int i;
znode_t *rootzp = NULL;
vnode_t *vp;
vattr_t vattr;
znode_t *zp;
zfs_acl_ids_t acl_ids;
#else
timestruc_t now;
dmu_buf_t *db;
znode_phys_t *pzp;
#endif /* HAVE_ZPL */
/*
* 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);
ASSERT(error == 0);
/*
* 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;
ASSERT(nvpair_type(elem) == DATA_TYPE_UINT64);
VERIFY(nvpair_value_uint64(elem, &val) == 0);
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);
}
ASSERT(error == 0);
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;
}
ASSERT(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);
ASSERT(error == 0);
} 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);
ASSERT(error == 0);
#ifdef HAVE_ZPL
/*
* Create root znode. Create minimal znode/vnode/zfsvfs
* to allow zfs_mknode to work.
*/
vattr.va_mask = AT_MODE|AT_UID|AT_GID|AT_TYPE;
vattr.va_type = VDIR;
vattr.va_mode = S_IFDIR|0755;
vattr.va_uid = crgetuid(cr);
vattr.va_gid = crgetgid(cr);
rootzp = kmem_cache_alloc(znode_cache, KM_SLEEP);
rootzp->z_unlinked = 0;
rootzp->z_atime_dirty = 0;
rootzp->z_is_sa = USE_SA(version, os);
vp = ZTOV(rootzp);
vn_reinit(vp);
vp->v_type = VDIR;
bzero(&zfsvfs, sizeof (zfsvfs_t));
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;
zfsvfs.z_attr_table = sa_setup(os, sa_obj, zfs_attr_table, ZPL_END);
/*
* 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;
/* XXX - This must be destroyed but I'm not quite sure yet so
* I'm just annotating that fact when it's an issue. -Brian */
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);
ASSERT(!POINTER_IS_VALID(rootzp->z_zfsvfs));
rootzp->z_zfsvfs = &zfsvfs;
VERIFY(0 == 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);
ASSERT(!vn_in_dnlc(ZTOV(rootzp))); /* not valid to move */
error = zap_add(os, moid, ZFS_ROOT_OBJ, 8, 1, &rootzp->z_id, tx);
ASSERT(error == 0);
zfs_acl_ids_free(&acl_ids);
POINTER_INVALIDATE(&rootzp->z_zfsvfs);
ZTOV(rootzp)->v_count = 0;
sa_handle_destroy(rootzp->z_sa_hdl);
kmem_cache_free(znode_cache, rootzp);
error = zfs_create_share_dir(&zfsvfs, tx);
for (i = 0; i != ZFS_OBJ_MTX_SZ; i++)
mutex_destroy(&zfsvfs.z_hold_mtx[i]);
#else
/*
* Create root znode with code free of VFS dependencies
*/
obj = zap_create_norm(os, norm, DMU_OT_DIRECTORY_CONTENTS,
DMU_OT_ZNODE, sizeof (znode_phys_t), tx);
VERIFY(0 == dmu_bonus_hold(os, obj, FTAG, &db));
dmu_buf_will_dirty(db, tx);
/*
* Initialize the znode physical data to zero.
*/
ASSERT(db->db_size >= sizeof (znode_phys_t));
bzero(db->db_data, db->db_size);
pzp = db->db_data;
if (USE_FUIDS(version, os))
pzp->zp_flags = ZFS_ARCHIVE | ZFS_AV_MODIFIED;
pzp->zp_size = 2; /* "." and ".." */
pzp->zp_links = 2;
pzp->zp_parent = obj;
pzp->zp_gen = dmu_tx_get_txg(tx);
pzp->zp_mode = S_IFDIR | 0755;
pzp->zp_flags = ZFS_ACL_TRIVIAL;
gethrestime(&now);
ZFS_TIME_ENCODE(&now, pzp->zp_crtime);
ZFS_TIME_ENCODE(&now, pzp->zp_ctime);
ZFS_TIME_ENCODE(&now, pzp->zp_atime);
ZFS_TIME_ENCODE(&now, pzp->zp_mtime);
error = zap_add(os, moid, ZFS_ROOT_OBJ, 8, 1, &obj, tx);
ASSERT(error == 0);
dmu_buf_rele(db, FTAG);
#endif /* HAVE_ZPL */
}
#endif /* _KERNEL */
/*
* 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, uint64_t obj, uint64_t *pobjp, int *is_xattrdir,
sa_attr_type_t *sa_table)
{
dmu_buf_t *db;
dmu_object_info_t doi;
int error;
uint64_t parent;
uint64_t pflags;
uint64_t mode;
sa_bulk_attr_t bulk[3];
sa_handle_t *hdl;
int count = 0;
if ((error = sa_buf_hold(osp, obj, FTAG, &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, FTAG);
return (EINVAL);
}
if ((error = sa_handle_get(osp, obj, NULL, SA_HDL_PRIVATE,
&hdl)) != 0) {
sa_buf_rele(db, FTAG);
return (error);
}
SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_PARENT],
NULL, &parent, 8);
SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_FLAGS], NULL,
&pflags, 8);
SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_MODE], NULL,
&mode, 8);
if ((error = sa_bulk_lookup(hdl, bulk, count)) != 0) {
sa_buf_rele(db, FTAG);
sa_handle_destroy(hdl);
return (error);
}
*pobjp = parent;
*is_xattrdir = ((pflags & ZFS_XATTR) != 0) && S_ISDIR(mode);
sa_handle_destroy(hdl);
sa_buf_rele(db, FTAG);
return (0);
}
int
zfs_obj_to_path(objset_t *osp, uint64_t obj, char *buf, int len)
{
char *path = buf + len - 1;
sa_attr_type_t *sa_table;
int error;
uint64_t sa_obj = 0;
*path = '\0';
error = zap_lookup(osp, MASTER_NODE_OBJ, ZFS_SA_ATTRS, 8, 1, &sa_obj);
if (error != 0 && error != ENOENT)
return (error);
sa_table = sa_setup(osp, sa_obj, zfs_attr_table, ZPL_END);
for (;;) {
uint64_t pobj;
char component[MAXNAMELEN + 2];
size_t complen;
int is_xattrdir;
if ((error = zfs_obj_to_pobj(osp, obj, &pobj,
&is_xattrdir, sa_table)) != 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;
ASSERT(path >= buf);
bcopy(component, path, complen);
obj = pobj;
}
if (error == 0)
(void) memmove(buf, path, buf + len - path);
return (error);
}
#if defined(_KERNEL) && defined(HAVE_SPL)
EXPORT_SYMBOL(zfs_create_fs);
EXPORT_SYMBOL(zfs_obj_to_path);
#endif
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