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mirror_zfs/module/zfs/zfs_log.c
Jitendra Patidar 361a7e8211
log xattr=sa create/remove/update to ZIL 
As such, there are no specific synchronous semantics defined for
the xattrs. But for xattr=on, it does log to ZIL and zil_commit() is
done, if sync=always is set on dataset. This provides sync semantics
for xattr=on with sync=always set on dataset.

For the xattr=sa implementation, it doesn't log to ZIL, so, even with
sync=always, xattrs are not guaranteed to be synced before xattr call
returns to caller. So, xattr can be lost if system crash happens, before
txg carrying xattr transaction is synced.

This change adds xattr=sa logging to ZIL on xattr create/remove/update
and xattrs are synced to ZIL (zil_commit() done) for sync=always.
This makes xattr=sa behavior similar to xattr=on.

Implementation notes:
The actual logging is fairly straight-forward and does not warrant
additional explanation.
However, it has been 14 years since we last added new TX types
to the ZIL [1], hence this is the first time we do it after the
introduction of zpool features. Therefore, here is an overview of the
feature activation and deactivation workflow:

1. The feature must be enabled. Otherwise, we don't log the new
    record type. This ensures compatibility with older software.
2. The feature is activated per-dataset, since the ZIL is per-dataset.
3. If the feature is enabled and dataset is not for zvol, any append to
    the ZIL chain will activate the feature for the dataset. Likewise
    for starting a new ZIL chain.
4. A dataset that doesn't have a ZIL chain has the feature deactivated.

We ensure (3) by activating on the first zil_commit() after the feature
was enabled. Since activating the features requires waiting for txg
sync, the first zil_commit() after enabling the feature will be slower
than usual. The downside is that this is really a conservative
approximation: even if we never append a 'TX_SETSAXATTR' to the ZIL
chain, we pay the penalty for feature activation. The upside is that the
user is in control of when we pay the penalty, i.e., upon enabling the
feature.

We ensure (4) by hooking into zil_sync(), where ZIL destroy actually
happens.

One more piece on feature activation, since it's spread across
multiple functions:

zil_commit()
  zil_process_commit_list()
    if lwb == NULL // first zil_commit since zil_open
      zil_create()
        if no log block pointer in ZIL header:
          if feature enabled and not active:
	    // CASE 1
            enable, COALESCE txg wait with dmu_tx that allocated the
	    log block
         else // log block was allocated earlier than this zil_open
          if feature enabled and not active:
	    // CASE 2
            enable, EXPLICIT txg wait
    else // already have an in-DRAM LWB
      if feature enabled and not active:
        // this happens when we enable the feature after zil_create
	// CASE 3
        enable, EXPLICIT txg wait

[1] da6c28aaf6

Reviewed-by: Matthew Ahrens <mahrens@delphix.com>
Reviewed-by: Christian Schwarz <christian.schwarz@nutanix.com>
Reviewed-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Reviewed-by: Ryan Moeller <freqlabs@FreeBSD.org>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Jitendra Patidar <jitendra.patidar@nutanix.com>
Closes #8768 
Closes #9078
2022-02-22 13:06:43 -08:00

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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2015, 2018 by Delphix. All rights reserved.
*/
#include <sys/types.h>
#include <sys/param.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/zil_impl.h>
#include <sys/byteorder.h>
#include <sys/policy.h>
#include <sys/stat.h>
#include <sys/acl.h>
#include <sys/dmu.h>
#include <sys/dbuf.h>
#include <sys/spa.h>
#include <sys/zfs_fuid.h>
#include <sys/dsl_dataset.h>
/*
* These zfs_log_* functions must be called within a dmu tx, in one
* of 2 contexts depending on zilog->z_replay:
*
* Non replay mode
* ---------------
* We need to record the transaction so that if it is committed to
* the Intent Log then it can be replayed. An intent log transaction
* structure (itx_t) is allocated and all the information necessary to
* possibly replay the transaction is saved in it. The itx is then assigned
* a sequence number and inserted in the in-memory list anchored in the zilog.
*
* Replay mode
* -----------
* We need to mark the intent log record as replayed in the log header.
* This is done in the same transaction as the replay so that they
* commit atomically.
*/
int
zfs_log_create_txtype(zil_create_t type, vsecattr_t *vsecp, vattr_t *vap)
{
int isxvattr = (vap->va_mask & ATTR_XVATTR);
switch (type) {
case Z_FILE:
if (vsecp == NULL && !isxvattr)
return (TX_CREATE);
if (vsecp && isxvattr)
return (TX_CREATE_ACL_ATTR);
if (vsecp)
return (TX_CREATE_ACL);
else
return (TX_CREATE_ATTR);
case Z_DIR:
if (vsecp == NULL && !isxvattr)
return (TX_MKDIR);
if (vsecp && isxvattr)
return (TX_MKDIR_ACL_ATTR);
if (vsecp)
return (TX_MKDIR_ACL);
else
return (TX_MKDIR_ATTR);
case Z_XATTRDIR:
return (TX_MKXATTR);
}
ASSERT(0);
return (TX_MAX_TYPE);
}
/*
* build up the log data necessary for logging xvattr_t
* First lr_attr_t is initialized. following the lr_attr_t
* is the mapsize and attribute bitmap copied from the xvattr_t.
* Following the bitmap and bitmapsize two 64 bit words are reserved
* for the create time which may be set. Following the create time
* records a single 64 bit integer which has the bits to set on
* replay for the xvattr.
*/
static void
zfs_log_xvattr(lr_attr_t *lrattr, xvattr_t *xvap)
{
uint32_t *bitmap;
uint64_t *attrs;
uint64_t *crtime;
xoptattr_t *xoap;
void *scanstamp;
int i;
xoap = xva_getxoptattr(xvap);
ASSERT(xoap);
lrattr->lr_attr_masksize = xvap->xva_mapsize;
bitmap = &lrattr->lr_attr_bitmap;
for (i = 0; i != xvap->xva_mapsize; i++, bitmap++) {
*bitmap = xvap->xva_reqattrmap[i];
}
/* Now pack the attributes up in a single uint64_t */
attrs = (uint64_t *)bitmap;
*attrs = 0;
crtime = attrs + 1;
bzero(crtime, 2 * sizeof (uint64_t));
scanstamp = (caddr_t)(crtime + 2);
bzero(scanstamp, AV_SCANSTAMP_SZ);
if (XVA_ISSET_REQ(xvap, XAT_READONLY))
*attrs |= (xoap->xoa_readonly == 0) ? 0 :
XAT0_READONLY;
if (XVA_ISSET_REQ(xvap, XAT_HIDDEN))
*attrs |= (xoap->xoa_hidden == 0) ? 0 :
XAT0_HIDDEN;
if (XVA_ISSET_REQ(xvap, XAT_SYSTEM))
*attrs |= (xoap->xoa_system == 0) ? 0 :
XAT0_SYSTEM;
if (XVA_ISSET_REQ(xvap, XAT_ARCHIVE))
*attrs |= (xoap->xoa_archive == 0) ? 0 :
XAT0_ARCHIVE;
if (XVA_ISSET_REQ(xvap, XAT_IMMUTABLE))
*attrs |= (xoap->xoa_immutable == 0) ? 0 :
XAT0_IMMUTABLE;
if (XVA_ISSET_REQ(xvap, XAT_NOUNLINK))
*attrs |= (xoap->xoa_nounlink == 0) ? 0 :
XAT0_NOUNLINK;
if (XVA_ISSET_REQ(xvap, XAT_APPENDONLY))
*attrs |= (xoap->xoa_appendonly == 0) ? 0 :
XAT0_APPENDONLY;
if (XVA_ISSET_REQ(xvap, XAT_OPAQUE))
*attrs |= (xoap->xoa_opaque == 0) ? 0 :
XAT0_APPENDONLY;
if (XVA_ISSET_REQ(xvap, XAT_NODUMP))
*attrs |= (xoap->xoa_nodump == 0) ? 0 :
XAT0_NODUMP;
if (XVA_ISSET_REQ(xvap, XAT_AV_QUARANTINED))
*attrs |= (xoap->xoa_av_quarantined == 0) ? 0 :
XAT0_AV_QUARANTINED;
if (XVA_ISSET_REQ(xvap, XAT_AV_MODIFIED))
*attrs |= (xoap->xoa_av_modified == 0) ? 0 :
XAT0_AV_MODIFIED;
if (XVA_ISSET_REQ(xvap, XAT_CREATETIME))
ZFS_TIME_ENCODE(&xoap->xoa_createtime, crtime);
if (XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP)) {
ASSERT(!XVA_ISSET_REQ(xvap, XAT_PROJID));
bcopy(xoap->xoa_av_scanstamp, scanstamp, AV_SCANSTAMP_SZ);
} else if (XVA_ISSET_REQ(xvap, XAT_PROJID)) {
/*
* XAT_PROJID and XAT_AV_SCANSTAMP will never be valid
* at the same time, so we can share the same space.
*/
bcopy(&xoap->xoa_projid, scanstamp, sizeof (uint64_t));
}
if (XVA_ISSET_REQ(xvap, XAT_REPARSE))
*attrs |= (xoap->xoa_reparse == 0) ? 0 :
XAT0_REPARSE;
if (XVA_ISSET_REQ(xvap, XAT_OFFLINE))
*attrs |= (xoap->xoa_offline == 0) ? 0 :
XAT0_OFFLINE;
if (XVA_ISSET_REQ(xvap, XAT_SPARSE))
*attrs |= (xoap->xoa_sparse == 0) ? 0 :
XAT0_SPARSE;
if (XVA_ISSET_REQ(xvap, XAT_PROJINHERIT))
*attrs |= (xoap->xoa_projinherit == 0) ? 0 :
XAT0_PROJINHERIT;
}
static void *
zfs_log_fuid_ids(zfs_fuid_info_t *fuidp, void *start)
{
zfs_fuid_t *zfuid;
uint64_t *fuidloc = start;
/* First copy in the ACE FUIDs */
for (zfuid = list_head(&fuidp->z_fuids); zfuid;
zfuid = list_next(&fuidp->z_fuids, zfuid)) {
*fuidloc++ = zfuid->z_logfuid;
}
return (fuidloc);
}
static void *
zfs_log_fuid_domains(zfs_fuid_info_t *fuidp, void *start)
{
zfs_fuid_domain_t *zdomain;
/* now copy in the domain info, if any */
if (fuidp->z_domain_str_sz != 0) {
for (zdomain = list_head(&fuidp->z_domains); zdomain;
zdomain = list_next(&fuidp->z_domains, zdomain)) {
bcopy((void *)zdomain->z_domain, start,
strlen(zdomain->z_domain) + 1);
start = (caddr_t)start +
strlen(zdomain->z_domain) + 1;
}
}
return (start);
}
/*
* If zp is an xattr node, check whether the xattr owner is unlinked.
* We don't want to log anything if the owner is unlinked.
*/
static int
zfs_xattr_owner_unlinked(znode_t *zp)
{
int unlinked = 0;
znode_t *dzp;
#ifdef __FreeBSD__
znode_t *tzp = zp;
/*
* zrele drops the vnode lock which violates the VOP locking contract
* on FreeBSD. See comment at the top of zfs_replay.c for more detail.
*/
/*
* if zp is XATTR node, keep walking up via z_xattr_parent until we
* get the owner
*/
while (tzp->z_pflags & ZFS_XATTR) {
ASSERT3U(zp->z_xattr_parent, !=, 0);
if (zfs_zget(ZTOZSB(tzp), tzp->z_xattr_parent, &dzp) != 0) {
unlinked = 1;
break;
}
if (tzp != zp)
zrele(tzp);
tzp = dzp;
unlinked = tzp->z_unlinked;
}
if (tzp != zp)
zrele(tzp);
#else
zhold(zp);
/*
* if zp is XATTR node, keep walking up via z_xattr_parent until we
* get the owner
*/
while (zp->z_pflags & ZFS_XATTR) {
ASSERT3U(zp->z_xattr_parent, !=, 0);
if (zfs_zget(ZTOZSB(zp), zp->z_xattr_parent, &dzp) != 0) {
unlinked = 1;
break;
}
zrele(zp);
zp = dzp;
unlinked = zp->z_unlinked;
}
zrele(zp);
#endif
return (unlinked);
}
/*
* Handles TX_CREATE, TX_CREATE_ATTR, TX_MKDIR, TX_MKDIR_ATTR and
* TK_MKXATTR transactions.
*
* TX_CREATE and TX_MKDIR are standard creates, but they may have FUID
* domain information appended prior to the name. In this case the
* uid/gid in the log record will be a log centric FUID.
*
* TX_CREATE_ACL_ATTR and TX_MKDIR_ACL_ATTR handle special creates that
* may contain attributes, ACL and optional fuid information.
*
* TX_CREATE_ACL and TX_MKDIR_ACL handle special creates that specify
* and ACL and normal users/groups in the ACEs.
*
* There may be an optional xvattr attribute information similar
* to zfs_log_setattr.
*
* Also, after the file name "domain" strings may be appended.
*/
void
zfs_log_create(zilog_t *zilog, dmu_tx_t *tx, uint64_t txtype,
znode_t *dzp, znode_t *zp, const char *name, vsecattr_t *vsecp,
zfs_fuid_info_t *fuidp, vattr_t *vap)
{
itx_t *itx;
lr_create_t *lr;
lr_acl_create_t *lracl;
size_t aclsize = 0;
size_t xvatsize = 0;
size_t txsize;
xvattr_t *xvap = (xvattr_t *)vap;
void *end;
size_t lrsize;
size_t namesize = strlen(name) + 1;
size_t fuidsz = 0;
if (zil_replaying(zilog, tx) || zfs_xattr_owner_unlinked(dzp))
return;
/*
* If we have FUIDs present then add in space for
* domains and ACE fuid's if any.
*/
if (fuidp) {
fuidsz += fuidp->z_domain_str_sz;
fuidsz += fuidp->z_fuid_cnt * sizeof (uint64_t);
}
if (vap->va_mask & ATTR_XVATTR)
xvatsize = ZIL_XVAT_SIZE(xvap->xva_mapsize);
if ((int)txtype == TX_CREATE_ATTR || (int)txtype == TX_MKDIR_ATTR ||
(int)txtype == TX_CREATE || (int)txtype == TX_MKDIR ||
(int)txtype == TX_MKXATTR) {
txsize = sizeof (*lr) + namesize + fuidsz + xvatsize;
lrsize = sizeof (*lr);
} else {
txsize =
sizeof (lr_acl_create_t) + namesize + fuidsz +
ZIL_ACE_LENGTH(aclsize) + xvatsize;
lrsize = sizeof (lr_acl_create_t);
}
itx = zil_itx_create(txtype, txsize);
lr = (lr_create_t *)&itx->itx_lr;
lr->lr_doid = dzp->z_id;
lr->lr_foid = zp->z_id;
/* Store dnode slot count in 8 bits above object id. */
LR_FOID_SET_SLOTS(lr->lr_foid, zp->z_dnodesize >> DNODE_SHIFT);
lr->lr_mode = zp->z_mode;
if (!IS_EPHEMERAL(KUID_TO_SUID(ZTOUID(zp)))) {
lr->lr_uid = (uint64_t)KUID_TO_SUID(ZTOUID(zp));
} else {
lr->lr_uid = fuidp->z_fuid_owner;
}
if (!IS_EPHEMERAL(KGID_TO_SGID(ZTOGID(zp)))) {
lr->lr_gid = (uint64_t)KGID_TO_SGID(ZTOGID(zp));
} else {
lr->lr_gid = fuidp->z_fuid_group;
}
(void) sa_lookup(zp->z_sa_hdl, SA_ZPL_GEN(ZTOZSB(zp)), &lr->lr_gen,
sizeof (uint64_t));
(void) sa_lookup(zp->z_sa_hdl, SA_ZPL_CRTIME(ZTOZSB(zp)),
lr->lr_crtime, sizeof (uint64_t) * 2);
if (sa_lookup(zp->z_sa_hdl, SA_ZPL_RDEV(ZTOZSB(zp)), &lr->lr_rdev,
sizeof (lr->lr_rdev)) != 0)
lr->lr_rdev = 0;
/*
* Fill in xvattr info if any
*/
if (vap->va_mask & ATTR_XVATTR) {
zfs_log_xvattr((lr_attr_t *)((caddr_t)lr + lrsize), xvap);
end = (caddr_t)lr + lrsize + xvatsize;
} else {
end = (caddr_t)lr + lrsize;
}
/* Now fill in any ACL info */
if (vsecp) {
lracl = (lr_acl_create_t *)&itx->itx_lr;
lracl->lr_aclcnt = vsecp->vsa_aclcnt;
lracl->lr_acl_bytes = aclsize;
lracl->lr_domcnt = fuidp ? fuidp->z_domain_cnt : 0;
lracl->lr_fuidcnt = fuidp ? fuidp->z_fuid_cnt : 0;
if (vsecp->vsa_aclflags & VSA_ACE_ACLFLAGS)
lracl->lr_acl_flags = (uint64_t)vsecp->vsa_aclflags;
else
lracl->lr_acl_flags = 0;
bcopy(vsecp->vsa_aclentp, end, aclsize);
end = (caddr_t)end + ZIL_ACE_LENGTH(aclsize);
}
/* drop in FUID info */
if (fuidp) {
end = zfs_log_fuid_ids(fuidp, end);
end = zfs_log_fuid_domains(fuidp, end);
}
/*
* Now place file name in log record
*/
bcopy(name, end, namesize);
zil_itx_assign(zilog, itx, tx);
}
/*
* Handles both TX_REMOVE and TX_RMDIR transactions.
*/
void
zfs_log_remove(zilog_t *zilog, dmu_tx_t *tx, uint64_t txtype,
znode_t *dzp, const char *name, uint64_t foid, boolean_t unlinked)
{
itx_t *itx;
lr_remove_t *lr;
size_t namesize = strlen(name) + 1;
if (zil_replaying(zilog, tx) || zfs_xattr_owner_unlinked(dzp))
return;
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);
itx->itx_oid = foid;
/*
* Object ids can be re-instantiated in the next txg so
* remove any async transactions to avoid future leaks.
* This can happen if a fsync occurs on the re-instantiated
* object for a WR_INDIRECT or WR_NEED_COPY write, which gets
* the new file data and flushes a write record for the old object.
*/
if (unlinked) {
ASSERT((txtype & ~TX_CI) == TX_REMOVE);
zil_remove_async(zilog, foid);
}
zil_itx_assign(zilog, itx, tx);
}
/*
* Handles TX_LINK transactions.
*/
void
zfs_log_link(zilog_t *zilog, dmu_tx_t *tx, uint64_t txtype,
znode_t *dzp, znode_t *zp, const char *name)
{
itx_t *itx;
lr_link_t *lr;
size_t namesize = strlen(name) + 1;
if (zil_replaying(zilog, tx))
return;
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);
zil_itx_assign(zilog, itx, tx);
}
/*
* Handles TX_SYMLINK transactions.
*/
void
zfs_log_symlink(zilog_t *zilog, dmu_tx_t *tx, uint64_t txtype,
znode_t *dzp, znode_t *zp, const char *name, const char *link)
{
itx_t *itx;
lr_create_t *lr;
size_t namesize = strlen(name) + 1;
size_t linksize = strlen(link) + 1;
if (zil_replaying(zilog, tx))
return;
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_uid = KUID_TO_SUID(ZTOUID(zp));
lr->lr_gid = KGID_TO_SGID(ZTOGID(zp));
lr->lr_mode = zp->z_mode;
(void) sa_lookup(zp->z_sa_hdl, SA_ZPL_GEN(ZTOZSB(zp)), &lr->lr_gen,
sizeof (uint64_t));
(void) sa_lookup(zp->z_sa_hdl, SA_ZPL_CRTIME(ZTOZSB(zp)),
lr->lr_crtime, sizeof (uint64_t) * 2);
bcopy(name, (char *)(lr + 1), namesize);
bcopy(link, (char *)(lr + 1) + namesize, linksize);
zil_itx_assign(zilog, itx, tx);
}
/*
* Handles TX_RENAME transactions.
*/
void
zfs_log_rename(zilog_t *zilog, dmu_tx_t *tx, uint64_t txtype, znode_t *sdzp,
const char *sname, znode_t *tdzp, const char *dname, znode_t *szp)
{
itx_t *itx;
lr_rename_t *lr;
size_t snamesize = strlen(sname) + 1;
size_t dnamesize = strlen(dname) + 1;
if (zil_replaying(zilog, tx))
return;
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);
itx->itx_oid = szp->z_id;
zil_itx_assign(zilog, itx, tx);
}
/*
* zfs_log_write() handles TX_WRITE transactions. The specified callback is
* called as soon as the write is on stable storage (be it via a DMU sync or a
* ZIL commit).
*/
static long zfs_immediate_write_sz = 32768;
void
zfs_log_write(zilog_t *zilog, dmu_tx_t *tx, int txtype,
znode_t *zp, offset_t off, ssize_t resid, int ioflag,
zil_callback_t callback, void *callback_data)
{
dmu_buf_impl_t *db = (dmu_buf_impl_t *)sa_get_db(zp->z_sa_hdl);
uint32_t blocksize = zp->z_blksz;
itx_wr_state_t write_state;
uintptr_t fsync_cnt;
uint64_t gen = 0;
ssize_t size = resid;
if (zil_replaying(zilog, tx) || zp->z_unlinked ||
zfs_xattr_owner_unlinked(zp)) {
if (callback != NULL)
callback(callback_data);
return;
}
if (zilog->zl_logbias == ZFS_LOGBIAS_THROUGHPUT)
write_state = WR_INDIRECT;
else if (!spa_has_slogs(zilog->zl_spa) &&
resid >= zfs_immediate_write_sz)
write_state = WR_INDIRECT;
else if (ioflag & (O_SYNC | O_DSYNC))
write_state = WR_COPIED;
else
write_state = WR_NEED_COPY;
if ((fsync_cnt = (uintptr_t)tsd_get(zfs_fsyncer_key)) != 0) {
(void) tsd_set(zfs_fsyncer_key, (void *)(fsync_cnt - 1));
}
(void) sa_lookup(zp->z_sa_hdl, SA_ZPL_GEN(ZTOZSB(zp)), &gen,
sizeof (gen));
while (resid) {
itx_t *itx;
lr_write_t *lr;
itx_wr_state_t wr_state = write_state;
ssize_t len = resid;
/*
* A WR_COPIED record must fit entirely in one log block.
* Large writes can use WR_NEED_COPY, which the ZIL will
* split into multiple records across several log blocks
* if necessary.
*/
if (wr_state == WR_COPIED &&
resid > zil_max_copied_data(zilog))
wr_state = WR_NEED_COPY;
else if (wr_state == WR_INDIRECT)
len = MIN(blocksize - P2PHASE(off, blocksize), resid);
itx = zil_itx_create(txtype, sizeof (*lr) +
(wr_state == WR_COPIED ? len : 0));
lr = (lr_write_t *)&itx->itx_lr;
/*
* For WR_COPIED records, copy the data into the lr_write_t.
*/
if (wr_state == WR_COPIED) {
int err;
DB_DNODE_ENTER(db);
err = dmu_read_by_dnode(DB_DNODE(db), off, len, lr + 1,
DMU_READ_NO_PREFETCH);
if (err != 0) {
zil_itx_destroy(itx);
itx = zil_itx_create(txtype, sizeof (*lr));
lr = (lr_write_t *)&itx->itx_lr;
wr_state = WR_NEED_COPY;
}
DB_DNODE_EXIT(db);
}
itx->itx_wr_state = wr_state;
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 = ZTOZSB(zp);
itx->itx_gen = gen;
if (!(ioflag & (O_SYNC | O_DSYNC)) && (zp->z_sync_cnt == 0) &&
(fsync_cnt == 0))
itx->itx_sync = B_FALSE;
itx->itx_callback = callback;
itx->itx_callback_data = callback_data;
zil_itx_assign(zilog, itx, tx);
off += len;
resid -= len;
}
if (write_state == WR_COPIED || write_state == WR_NEED_COPY) {
dsl_pool_wrlog_count(zilog->zl_dmu_pool, size, tx->tx_txg);
}
}
/*
* Handles TX_TRUNCATE transactions.
*/
void
zfs_log_truncate(zilog_t *zilog, dmu_tx_t *tx, int txtype,
znode_t *zp, uint64_t off, uint64_t len)
{
itx_t *itx;
lr_truncate_t *lr;
if (zil_replaying(zilog, tx) || zp->z_unlinked ||
zfs_xattr_owner_unlinked(zp))
return;
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;
itx->itx_sync = (zp->z_sync_cnt != 0);
zil_itx_assign(zilog, itx, tx);
}
/*
* Handles TX_SETATTR transactions.
*/
void
zfs_log_setattr(zilog_t *zilog, dmu_tx_t *tx, int txtype,
znode_t *zp, vattr_t *vap, uint_t mask_applied, zfs_fuid_info_t *fuidp)
{
itx_t *itx;
lr_setattr_t *lr;
xvattr_t *xvap = (xvattr_t *)vap;
size_t recsize = sizeof (lr_setattr_t);
void *start;
if (zil_replaying(zilog, tx) || zp->z_unlinked)
return;
/*
* If XVATTR set, then log record size needs to allow
* for lr_attr_t + xvattr mask, mapsize and create time
* plus actual attribute values
*/
if (vap->va_mask & ATTR_XVATTR)
recsize = sizeof (*lr) + ZIL_XVAT_SIZE(xvap->xva_mapsize);
if (fuidp)
recsize += fuidp->z_domain_str_sz;
itx = zil_itx_create(txtype, recsize);
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;
if ((mask_applied & ATTR_UID) && IS_EPHEMERAL(vap->va_uid))
lr->lr_uid = fuidp->z_fuid_owner;
else
lr->lr_uid = (uint64_t)vap->va_uid;
if ((mask_applied & ATTR_GID) && IS_EPHEMERAL(vap->va_gid))
lr->lr_gid = fuidp->z_fuid_group;
else
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);
start = (lr_setattr_t *)(lr + 1);
if (vap->va_mask & ATTR_XVATTR) {
zfs_log_xvattr((lr_attr_t *)start, xvap);
start = (caddr_t)start + ZIL_XVAT_SIZE(xvap->xva_mapsize);
}
/*
* Now stick on domain information if any on end
*/
if (fuidp)
(void) zfs_log_fuid_domains(fuidp, start);
itx->itx_sync = (zp->z_sync_cnt != 0);
zil_itx_assign(zilog, itx, tx);
}
/*
* Handles TX_SETSAXATTR transactions.
*/
void
zfs_log_setsaxattr(zilog_t *zilog, dmu_tx_t *tx, int txtype,
znode_t *zp, const char *name, const void *value, size_t size)
{
itx_t *itx;
lr_setsaxattr_t *lr;
size_t recsize = sizeof (lr_setsaxattr_t);
void *xattrstart;
int namelen;
if (zil_replaying(zilog, tx) || zp->z_unlinked)
return;
namelen = strlen(name) + 1;
recsize += (namelen + size);
itx = zil_itx_create(txtype, recsize);
lr = (lr_setsaxattr_t *)&itx->itx_lr;
lr->lr_foid = zp->z_id;
xattrstart = (char *)(lr + 1);
bcopy(name, xattrstart, namelen);
if (value != NULL) {
bcopy(value, (char *)xattrstart + namelen, size);
lr->lr_size = size;
} else {
lr->lr_size = 0;
}
itx->itx_sync = (zp->z_sync_cnt != 0);
zil_itx_assign(zilog, itx, tx);
}
/*
* Handles TX_ACL transactions.
*/
void
zfs_log_acl(zilog_t *zilog, dmu_tx_t *tx, znode_t *zp,
vsecattr_t *vsecp, zfs_fuid_info_t *fuidp)
{
itx_t *itx;
lr_acl_v0_t *lrv0;
lr_acl_t *lr;
int txtype;
int lrsize;
size_t txsize;
size_t aclbytes = vsecp->vsa_aclentsz;
if (zil_replaying(zilog, tx) || zp->z_unlinked)
return;
txtype = (ZTOZSB(zp)->z_version < ZPL_VERSION_FUID) ?
TX_ACL_V0 : TX_ACL;
if (txtype == TX_ACL)
lrsize = sizeof (*lr);
else
lrsize = sizeof (*lrv0);
txsize = lrsize +
((txtype == TX_ACL) ? ZIL_ACE_LENGTH(aclbytes) : aclbytes) +
(fuidp ? fuidp->z_domain_str_sz : 0) +
sizeof (uint64_t) * (fuidp ? fuidp->z_fuid_cnt : 0);
itx = zil_itx_create(txtype, txsize);
lr = (lr_acl_t *)&itx->itx_lr;
lr->lr_foid = zp->z_id;
if (txtype == TX_ACL) {
lr->lr_acl_bytes = aclbytes;
lr->lr_domcnt = fuidp ? fuidp->z_domain_cnt : 0;
lr->lr_fuidcnt = fuidp ? fuidp->z_fuid_cnt : 0;
if (vsecp->vsa_mask & VSA_ACE_ACLFLAGS)
lr->lr_acl_flags = (uint64_t)vsecp->vsa_aclflags;
else
lr->lr_acl_flags = 0;
}
lr->lr_aclcnt = (uint64_t)vsecp->vsa_aclcnt;
if (txtype == TX_ACL_V0) {
lrv0 = (lr_acl_v0_t *)lr;
bcopy(vsecp->vsa_aclentp, (ace_t *)(lrv0 + 1), aclbytes);
} else {
void *start = (ace_t *)(lr + 1);
bcopy(vsecp->vsa_aclentp, start, aclbytes);
start = (caddr_t)start + ZIL_ACE_LENGTH(aclbytes);
if (fuidp) {
start = zfs_log_fuid_ids(fuidp, start);
(void) zfs_log_fuid_domains(fuidp, start);
}
}
itx->itx_sync = (zp->z_sync_cnt != 0);
zil_itx_assign(zilog, itx, tx);
}
ZFS_MODULE_PARAM(zfs, zfs_, immediate_write_sz, LONG, ZMOD_RW,
"Largest data block to write to zil");
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