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7304b6e50f
freebsd-dev/module/zfs/zfs_znode.c
Brian Behlendorf 7304b6e50f VFS: Integrate zfs_znode_alloc() 
Under Linux the convention for filesystem specific data structure is
to embed it along with the generic vfs data structure.  This differs
significantly from Solaris.

Since we want to integrates as cleanly with the Linux VFS as possible.
This changes modifies zfs_znode_alloc() to allocate a znode with an
embedded inode for use with the generic VFS.  This is done by calling
iget_locked() which will allocate a new inode if needed by calling
sb->alloc_inode().  This function allocates enough memory for a
znode_t by returns a pointer to the inode structure for Linux's VFS.
This function is also responsible for setting the callback
znode->z_set_ops_inodes() which is used to register the correct
handlers for the inode.
2011-02-10 09:27:20 -08:00

1967 lines
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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 <sys/zfs_stat.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 */
/*
* 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
/*
* 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 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;
zp->z_moved = 0;
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);
}
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);
}
void
zfs_znode_fini(void)
{
/*
* Cleanup vfs & vnode ops
*/
#ifdef HAVE_ZPL
zfs_remove_op_tables();
#endif /* HAVE_ZPL */
/*
* Cleanup zcache
*/
if (znode_cache)
kmem_cache_destroy(znode_cache);
znode_cache = NULL;
rw_destroy(&zfsvfs_lock);
}
#ifdef HAVE_ZPL
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)
{
#ifdef HAVE_SHARE
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);
ASSERT(!POINTER_IS_VALID(sharezp->z_zfsvfs));
sharezp->z_moved = 0;
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);
#else
return (0);
#endif /* HAVE_SHARE */
}
/*
* 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
#endif /* HAVE_ZPL */
/*
* 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+inode 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;
struct inode *inode;
uint64_t parent;
sa_bulk_attr_t bulk[9];
int count = 0;
ASSERT(zfsvfs != NULL);
ASSERT(zfsvfs->z_vfs != NULL);
ASSERT(zfsvfs->z_vfs->mnt_sb != NULL);
inode = iget_locked(zfsvfs->z_vfs->mnt_sb, db->db_object);
zp = ITOZ(inode);
ASSERT(inode->i_state & I_NEW);
ASSERT(zp->z_dirlocks == NULL);
ASSERT(!POINTER_IS_VALID(zp->z_zfsvfs));
zp->z_moved = 0;
/*
* 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_id = db->db_object;
zp->z_blksz = blksz;
zp->z_seq = 0x7A4653;
zp->z_sync_cnt = 0;
zfs_znode_sa_init(zfsvfs, zp, db, obj_type, hdl);
SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zfsvfs), NULL,
&zp->z_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,
&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) {
if (hdl == NULL)
sa_handle_destroy(zp->z_sa_hdl);
iput(inode);
return (NULL);
}
inode->i_mode = (umode_t)zp->z_mode;
if ((S_ISCHR(inode->i_mode)) || (S_ISBLK(inode->i_mode))) {
uint64_t rdev;
VERIFY(sa_lookup(zp->z_sa_hdl, SA_ZPL_RDEV(zfsvfs),
&rdev, sizeof (rdev)) == 0);
inode->i_rdev = zfs_cmpldev(rdev);
}
/* zp->z_set_ops_inode() must be set in sb->alloc_inode() */
ASSERT(zp->z_set_ops_inode != NULL);
zp->z_set_ops_inode(inode);
unlock_new_inode(inode);
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;
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 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) {
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
*/
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);
}
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);
ASSERT3S(err, ==, 0);
}
kmem_free(sa_attrs, sizeof(sa_bulk_attr_t) * ZPL_END);
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)
{
#ifdef HAVE_XVATTR
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);
}
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);
}
#endif /* HAVE_XVATTR */
}
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;
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,
&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 (EIO);
}
zp->z_mode = mode;
if (gen != zp->z_gen) {
zfs_znode_dmu_fini(zp);
ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
return (EIO);
}
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(!zp->z_is_sa);
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);
}
#ifdef HAVE_ZPL
/*
* 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);
}
#endif /* HAVE_ZPL */
/*
* 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;
#ifdef HAVE_ZPL
vnode_t *vp = ZTOV(zp);
#endif /* HAVE_ZPL */
dmu_tx_t *tx;
rl_t *rl;
int error;
sa_bulk_attr_t bulk[2];
int count = 0;
/*
* 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;
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);
}
VERIFY(sa_bulk_update(zp->z_sa_hdl, bulk, count, tx) == 0);
dmu_tx_commit(tx);
#ifdef HAVE_ZPL
/*
* 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);
}
#endif /* HAVE_ZPL */
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)
{
#ifdef HAVE_ZPL
vnode_t *vp = ZTOV(zp);
#endif /* HAVE_ZPL */
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);
}
#ifdef HAVE_ZPL
/*
* 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);
}
#endif /* HAVE_ZPL */
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);
}
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);
ASSERT(!POINTER_IS_VALID(rootzp->z_zfsvfs));
rootzp->z_moved = 0;
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;
error = sa_setup(os, sa_obj, zfs_attr_table, ZPL_END,
&zfsvfs.z_attr_table);
ASSERT(error == 0);
/*
* 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);
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 */
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)
{
dmu_object_info_t doi;
int error;
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 (ENOTSUP);
}
error = sa_handle_get(osp, obj, NULL, SA_HDL_PRIVATE, hdlp);
if (error != 0) {
sa_buf_rele(*db, FTAG);
return (error);
}
return (0);
}
void
zfs_release_sa_handle(sa_handle_t *hdl, dmu_buf_t *db)
{
sa_handle_destroy(hdl);
sa_buf_rele(db, FTAG);
}
/*
* 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(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;
sa_bulk_attr_t bulk[3];
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);
*pobjp = parent;
*is_xattrdir = ((pflags & ZFS_XATTR) != 0) && S_ISDIR(mode);
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;
for (;;) {
uint64_t pobj;
char component[MAXNAMELEN + 2];
size_t complen;
int is_xattrdir;
if (prevdb)
zfs_release_sa_handle(prevhdl, prevdb);
if ((error = zfs_obj_to_pobj(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;
ASSERT(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);
if (error != 0) {
sa_hdl = prevhdl;
sa_db = prevdb;
break;
}
}
if (sa_hdl != NULL && sa_hdl != hdl) {
ASSERT(sa_db != NULL);
zfs_release_sa_handle(sa_hdl, sa_db);
}
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);
if (error != 0)
return (error);
error = zfs_obj_to_path_impl(osp, obj, hdl, sa_table, buf, len);
zfs_release_sa_handle(hdl, db);
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);
if (error != 0)
return (error);
error = zfs_obj_to_stats_impl(hdl, sa_table, sb);
if (error != 0) {
zfs_release_sa_handle(hdl, db);
return (error);
}
error = zfs_obj_to_path_impl(osp, obj, hdl, sa_table, buf, len);
zfs_release_sa_handle(hdl, db);
return (error);
}
#if defined(_KERNEL) && defined(HAVE_SPL)
EXPORT_SYMBOL(zfs_create_fs);
EXPORT_SYMBOL(zfs_obj_to_path);
#endif
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