zfs_log.c revision fa9e4066f08beec538e775443c5be79dd423fcab
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (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 2005 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include <sys/types.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/sysmacros.h>
#include <sys/cmn_err.h>
#include <sys/kmem.h>
#include <sys/thread.h>
#include <sys/file.h>
#include <sys/vfs.h>
#include <sys/zfs_znode.h>
#include <sys/zfs_dir.h>
#include <sys/zil.h>
#include <sys/byteorder.h>
#include <sys/policy.h>
#include <sys/stat.h>
#include <sys/mode.h>
#include <sys/acl.h>
#include <sys/dmu.h>
#include <sys/spa.h>
#include <sys/ddi.h>
/*
* All the functions in this file are used to construct the log entries
* to record transactions. They allocate * a intent log transaction
* structure (itx_t) and save within it all the information necessary to
* possibly replay the transaction. The itx is then assigned a sequence
* number and inserted in the in-memory list anchored in the zilog.
*/
/*
* zfs_log_create() is used to handle TX_CREATE, TX_MKDIR and TX_MKXATTR
* transactions.
*/
uint64_t
zfs_log_create(zilog_t *zilog, dmu_tx_t *tx, int txtype,
znode_t *dzp, znode_t *zp, char *name)
{
itx_t *itx;
uint64_t seq;
lr_create_t *lr;
size_t namesize = strlen(name) + 1;
if (zilog == NULL)
return (0);
itx = zil_itx_create(txtype, sizeof (*lr) + namesize);
lr = (lr_create_t *)&itx->itx_lr;
lr->lr_doid = dzp->z_id;
lr->lr_foid = zp->z_id;
lr->lr_mode = zp->z_phys->zp_mode;
lr->lr_uid = zp->z_phys->zp_uid;
lr->lr_gid = zp->z_phys->zp_gid;
lr->lr_gen = zp->z_phys->zp_gen;
lr->lr_crtime[0] = zp->z_phys->zp_crtime[0];
lr->lr_crtime[1] = zp->z_phys->zp_crtime[1];
lr->lr_rdev = zp->z_phys->zp_rdev;
bcopy(name, (char *)(lr + 1), namesize);
seq = zil_itx_assign(zilog, itx, tx);
dzp->z_last_itx = seq;
zp->z_last_itx = seq;
return (seq);
}
/*
* zfs_log_remove() handles both TX_REMOVE and TX_RMDIR transactions.
*/
uint64_t
zfs_log_remove(zilog_t *zilog, dmu_tx_t *tx, int txtype,
znode_t *dzp, char *name)
{
itx_t *itx;
uint64_t seq;
lr_remove_t *lr;
size_t namesize = strlen(name) + 1;
if (zilog == NULL)
return (0);
itx = zil_itx_create(txtype, sizeof (*lr) + namesize);
lr = (lr_remove_t *)&itx->itx_lr;
lr->lr_doid = dzp->z_id;
bcopy(name, (char *)(lr + 1), namesize);
seq = zil_itx_assign(zilog, itx, tx);
dzp->z_last_itx = seq;
return (seq);
}
/*
* zfs_log_link() handles TX_LINK transactions.
*/
uint64_t
zfs_log_link(zilog_t *zilog, dmu_tx_t *tx, int txtype,
znode_t *dzp, znode_t *zp, char *name)
{
itx_t *itx;
uint64_t seq;
lr_link_t *lr;
size_t namesize = strlen(name) + 1;
if (zilog == NULL)
return (0);
itx = zil_itx_create(txtype, sizeof (*lr) + namesize);
lr = (lr_link_t *)&itx->itx_lr;
lr->lr_doid = dzp->z_id;
lr->lr_link_obj = zp->z_id;
bcopy(name, (char *)(lr + 1), namesize);
seq = zil_itx_assign(zilog, itx, tx);
dzp->z_last_itx = seq;
zp->z_last_itx = seq;
return (seq);
}
/*
* zfs_log_symlink() handles TX_SYMLINK transactions.
*/
uint64_t
zfs_log_symlink(zilog_t *zilog, dmu_tx_t *tx, int txtype,
znode_t *dzp, znode_t *zp, char *name, char *link)
{
itx_t *itx;
uint64_t seq;
lr_create_t *lr;
size_t namesize = strlen(name) + 1;
size_t linksize = strlen(link) + 1;
if (zilog == NULL)
return (0);
itx = zil_itx_create(txtype, sizeof (*lr) + namesize + linksize);
lr = (lr_create_t *)&itx->itx_lr;
lr->lr_doid = dzp->z_id;
lr->lr_foid = zp->z_id;
lr->lr_mode = zp->z_phys->zp_mode;
lr->lr_uid = zp->z_phys->zp_uid;
lr->lr_gid = zp->z_phys->zp_gid;
lr->lr_gen = zp->z_phys->zp_gen;
lr->lr_crtime[0] = zp->z_phys->zp_crtime[0];
lr->lr_crtime[1] = zp->z_phys->zp_crtime[1];
bcopy(name, (char *)(lr + 1), namesize);
bcopy(link, (char *)(lr + 1) + namesize, linksize);
seq = zil_itx_assign(zilog, itx, tx);
dzp->z_last_itx = seq;
zp->z_last_itx = seq;
return (seq);
}
/*
* zfs_log_rename() handles TX_RENAME transactions.
*/
uint64_t
zfs_log_rename(zilog_t *zilog, dmu_tx_t *tx, int txtype,
znode_t *sdzp, char *sname, znode_t *tdzp, char *dname, znode_t *szp)
{
itx_t *itx;
uint64_t seq;
lr_rename_t *lr;
size_t snamesize = strlen(sname) + 1;
size_t dnamesize = strlen(dname) + 1;
if (zilog == NULL)
return (0);
itx = zil_itx_create(txtype, sizeof (*lr) + snamesize + dnamesize);
lr = (lr_rename_t *)&itx->itx_lr;
lr->lr_sdoid = sdzp->z_id;
lr->lr_tdoid = tdzp->z_id;
bcopy(sname, (char *)(lr + 1), snamesize);
bcopy(dname, (char *)(lr + 1) + snamesize, dnamesize);
seq = zil_itx_assign(zilog, itx, tx);
sdzp->z_last_itx = seq;
tdzp->z_last_itx = seq;
szp->z_last_itx = seq;
return (seq);
}
/*
* zfs_log_write() handles TX_WRITE transactions.
*
* We store data in the log buffers if it small enough.
* Otherwise we flush the data out via dmu_sync().
*/
ssize_t zfs_immediate_write_sz = 65536;
uint64_t
zfs_log_write(zilog_t *zilog, dmu_tx_t *tx, int txtype,
znode_t *zp, offset_t off, ssize_t len, int ioflag, uio_t *uio)
{
itx_t *itx;
uint64_t seq;
lr_write_t *lr;
int dlen, err;
if (zilog == NULL || zp->z_reap)
return (0);
dlen = (len <= zfs_immediate_write_sz ? len : 0);
itx = zil_itx_create(txtype, sizeof (*lr) + dlen);
itx->itx_data_copied = 0;
if ((ioflag & FDSYNC) && (dlen != 0)) {
err = xcopyin(uio->uio_iov->iov_base - len,
(char *)itx + offsetof(itx_t, itx_lr) + sizeof (*lr),
len);
/*
* copyin shouldn't fault as we've already successfully
* copied it to a dmu buffer. However if it does we'll get
* the data from the dmu later.
*/
if (!err)
itx->itx_data_copied = 1;
}
lr = (lr_write_t *)&itx->itx_lr;
lr->lr_foid = zp->z_id;
lr->lr_offset = off;
lr->lr_length = len;
lr->lr_blkoff = 0;
BP_ZERO(&lr->lr_blkptr);
itx->itx_private = zp->z_zfsvfs;
seq = zil_itx_assign(zilog, itx, tx);
zp->z_last_itx = seq;
return (seq);
}
/*
* zfs_log_truncate() handles TX_TRUNCATE transactions.
*/
uint64_t
zfs_log_truncate(zilog_t *zilog, dmu_tx_t *tx, int txtype,
znode_t *zp, uint64_t off, uint64_t len)
{
itx_t *itx;
uint64_t seq;
lr_truncate_t *lr;
if (zilog == NULL || zp->z_reap)
return (0);
itx = zil_itx_create(txtype, sizeof (*lr));
lr = (lr_truncate_t *)&itx->itx_lr;
lr->lr_foid = zp->z_id;
lr->lr_offset = off;
lr->lr_length = len;
seq = zil_itx_assign(zilog, itx, tx);
zp->z_last_itx = seq;
return (seq);
}
/*
* zfs_log_setattr() handles TX_SETATTR transactions.
*/
uint64_t
zfs_log_setattr(zilog_t *zilog, dmu_tx_t *tx, int txtype,
znode_t *zp, vattr_t *vap, uint_t mask_applied)
{
itx_t *itx;
uint64_t seq;
lr_setattr_t *lr;
if (zilog == NULL || zp->z_reap)
return (0);
itx = zil_itx_create(txtype, sizeof (*lr));
lr = (lr_setattr_t *)&itx->itx_lr;
lr->lr_foid = zp->z_id;
lr->lr_mask = (uint64_t)mask_applied;
lr->lr_mode = (uint64_t)vap->va_mode;
lr->lr_uid = (uint64_t)vap->va_uid;
lr->lr_gid = (uint64_t)vap->va_gid;
lr->lr_size = (uint64_t)vap->va_size;
ZFS_TIME_ENCODE(&vap->va_atime, lr->lr_atime);
ZFS_TIME_ENCODE(&vap->va_mtime, lr->lr_mtime);
seq = zil_itx_assign(zilog, itx, tx);
zp->z_last_itx = seq;
return (seq);
}
/*
* zfs_log_acl() handles TX_ACL transactions.
*/
uint64_t
zfs_log_acl(zilog_t *zilog, dmu_tx_t *tx, int txtype,
znode_t *zp, int aclcnt, ace_t *z_ace)
{
itx_t *itx;
uint64_t seq;
lr_acl_t *lr;
if (zilog == NULL || zp->z_reap)
return (0);
itx = zil_itx_create(txtype, sizeof (*lr) + aclcnt * sizeof (ace_t));
lr = (lr_acl_t *)&itx->itx_lr;
lr->lr_foid = zp->z_id;
lr->lr_aclcnt = (uint64_t)aclcnt;
bcopy(z_ace, (ace_t *)(lr + 1), aclcnt * sizeof (ace_t));
seq = zil_itx_assign(zilog, itx, tx);
zp->z_last_itx = seq;
return (seq);
}