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Remove projectquota space upgrade and usage update of ZFS_DEFAULT_PROJID
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Upgrading to feature@project_quota, currently trigger upgrade task
around project quota usage upgrade, which marks each inode dirty via,
dmu_objset_id_quota_upgrade()->dmu_objset_id_quota_upgrade_cb()->
dmu_objset_space_upgrade().
Project quota space upgrade task marks each dnode dirty, expecting that
when the dnode_sync() is done, dnode’s project usage would be accounted
in projid=0 (ZFS_DEFAULT_PROJID). But as there is no change in projid,
so effectively, project quota upgrade task doesn't change anything.

When actual projid is set on an object via `zfs project -p <projid> -s
<file/dir>`, then object usage gets account-ed under the projid set.
But usage for projid=0 (ZFS_DEFAULT_PROJID) underflows and becomes
negative. Because quota update task moves usage from projid "0" to
new projid set.

Solution:
dmu_objset_space_upgrade() for projectquota doesn't change the usage
accounting, so skip it. This effectively avoids dirtying large number
of dnodes, which is un-necessary.

Usage accounting for projid=0 (ZFS_DEFAULT_PROJID) doesn't give any
real benefit and it can't be updated for objects created before
project_quota feature upgrade, so skip updating usage for
ZFS_DEFAULT_PROJID in do_*quota_update() both for old and new objects.
Effectively no usage accounting for ZFS_DEFAULT_PROJID.

Signed-off-by: Jitendra Patidar <jitendra.patidar@nutanix.com>
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@jsai20
jsai20 committed Dec 20, 2024
1 parent ab7cbbe commit 638904d
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Showing 2 changed files with 41 additions and 56 deletions.
15 changes: 12 additions & 3 deletions module/zfs/dmu_objset.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -2035,7 +2035,8 @@ do_userquota_update(objset_t *os, userquota_cache_t *cache, uint64_t used,
(void) snprintf(name, sizeof (name), "%llx", (longlong_t)group);
userquota_update_cache(&cache->uqc_group_deltas, name, delta);

if (dmu_objset_projectquota_enabled(os)) {
if (dmu_objset_projectquota_enabled(os) &&
project != ZFS_DEFAULT_PROJID) {
(void) snprintf(name, sizeof (name), "%llx",
(longlong_t)project);
userquota_update_cache(&cache->uqc_project_deltas,
Expand All @@ -2060,7 +2061,8 @@ do_userobjquota_update(objset_t *os, userquota_cache_t *cache, uint64_t flags,
(longlong_t)group);
userquota_update_cache(&cache->uqc_group_deltas, name, delta);

if (dmu_objset_projectquota_enabled(os)) {
if (dmu_objset_projectquota_enabled(os) &&
project != ZFS_DEFAULT_PROJID) {
(void) snprintf(name, sizeof (name),
DMU_OBJACCT_PREFIX "%llx", (longlong_t)project);
userquota_update_cache(&cache->uqc_project_deltas,
Expand Down Expand Up @@ -2514,7 +2516,14 @@ dmu_objset_id_quota_upgrade_cb(objset_t *os)
dmu_objset_ds(os)->ds_feature_activation[
SPA_FEATURE_PROJECT_QUOTA] = (void *)B_TRUE;

err = dmu_objset_space_upgrade(os);
/*
* By marking each inode dirty in dmu_objset_space_upgrade() for
* projectquota doesn't get usage accounted, as projid is not changed.
* Object usage gets accounted, when projid is set on it. So, space
* upgrade for the project quota is un-necessary.
*/
if (!dmu_objset_userobjspace_present(os))
err = dmu_objset_space_upgrade(os);
if (err)
return (err);

Expand Down
82 changes: 29 additions & 53 deletions tests/zfs-tests/tests/functional/upgrade/upgrade_projectquota_001_pos.ksh
View file
Original file line number Diff line number Diff line change
Expand Up @@ -29,15 +29,12 @@
#
# DESCRIPTION:
#
# Check whether zfs upgrade for project quota works or not.
# The project quota is per dataset based feature, this test
# will create multiple datasets and try different upgrade methods.
# Check whether zpool upgrade for project quota works or not.
#
# STRATEGY:
# 1. Create a pool with all features disabled
# 2. Create a few dataset for testing
# 3. Make sure automatic upgrade work
# 4. Make sure manual upgrade work
# 1. Create a pool with projectquota features disabled
# 2. Create a dataset for testing
# 3. Validate projectquota upgrade works
#

verify_runnable "global"
Expand All @@ -49,31 +46,22 @@ fi
log_assert "pool upgrade for projectquota should work"
log_onexit cleanup_upgrade

log_must zpool create -d -m $TESTDIR $TESTPOOL $TMPDEV

log_must mkfiles $TESTDIR/tf $((RANDOM % 100 + 1))
log_must zfs create $TESTPOOL/fs1
log_must mkfiles $TESTDIR/fs1/tf $((RANDOM % 100 + 1))
log_must zfs umount $TESTPOOL/fs1

log_must zfs create $TESTPOOL/fs2
log_must mkdir $TESTDIR/fs2/dir
log_must mkfiles $TESTDIR/fs2/tf $((RANDOM % 100 + 1))
log_must zpool create -o feature@project_quota=disabled -m $TESTDIR $TESTPOOL $TMPDEV

log_must zfs create $TESTPOOL/fs3
log_must mkdir $TESTDIR/fs3/dir
log_must mkfiles $TESTDIR/fs3/tf $((RANDOM % 100 + 1))
log_must set_xattr_stdin passwd $TESTDIR/fs3/dir < /etc/passwd

# Make sure project quota is disabled
zfs projectspace -o used $TESTPOOL | grep -q "USED" &&
zpool get feature@project_quota -ovalue -H $TESTPOOL | grep -q "disabled" ||
log_fail "project quota should be disabled initially"

# set projectquota before upgrade will fail
log_mustnot zfs set projectquota@100=100m $TESTDIR/fs3
log_mustnot zfs set projectquota@100=100m $TESTPOOL/fs3

# set projectobjquota before upgrade will fail
log_mustnot zfs set projectobjquota@100=1000 $TESTDIR/fs3
log_mustnot zfs set projectobjquota@100=1000 $TESTPOOL/fs3

# 'chattr -p' should fail before upgrade
log_mustnot chattr -p 100 $TESTDIR/fs3/dir
Expand All @@ -83,33 +71,32 @@ log_mustnot chattr +P $TESTDIR/fs3/dir

# Upgrade zpool to support all features
log_must zpool upgrade $TESTPOOL
zpool get feature@project_quota -ovalue -H $TESTPOOL

# Double check project quota is disabled
zfs projectspace -o used $TESTPOOL | grep -q "USED" &&
log_fail "project quota should be disabled after pool upgrade"
# pool upgrade should enable project quota
zpool get feature@project_quota -ovalue -H $TESTPOOL | grep -q "enabled" ||
log_fail "project quota should be enabled after pool upgrade"

# Mount dataset should trigger upgrade
log_must zfs mount $TESTPOOL/fs1
log_must sleep 3 # upgrade done in the background so let's wait for a while
zfs projectspace -o used $TESTPOOL/fs1 | grep -q "USED" ||
log_fail "project quota should be enabled for $TESTPOOL/fs1"
# set projectquota should succeed after upgrade
log_must zfs set projectquota@100=100m $TESTPOOL/fs3

# Create file should trigger dataset upgrade
log_must mkfile 1m $TESTDIR/fs2/dir/tf
log_must sleep 3 # upgrade done in the background so let's wait for a while
zfs projectspace -o used $TESTPOOL/fs2 | grep -q "USED" ||
log_fail "project quota should be enabled for $TESTPOOL/fs2"
# set projectobjquota should succeed after upgrade
log_must zfs set projectobjquota@100=1000 $TESTPOOL/fs3

# "lsattr -p" should NOT trigger upgrade
log_must lsattr -p -d $TESTDIR/fs3/dir
zfs projectspace -o used $TESTPOOL/fs3 | grep -q "USED" &&
log_fail "project quota should not active for $TESTPOOL/fs3"

# 'chattr -p' should trigger dataset upgrade
# 'chattr -p' should succeed after upgrade
log_must chattr -p 100 $TESTDIR/fs3/dir
log_must sleep 5 # upgrade done in the background so let's wait for a while
zfs projectspace -o used $TESTPOOL/fs3 | grep -q "USED" ||
log_fail "project quota should be enabled for $TESTPOOL/fs3"

# 'chattr +P' should succeed after upgrade
log_must chattr +P $TESTDIR/fs3/dir

# project quota should be active
zpool get feature@project_quota -ovalue -H $TESTPOOL | grep -q "active" ||
log_fail "project quota should be active after chattr"
# project id 100 usage should be accounted
zfs projectspace -o name -H $TESTPOOL/fs3 | grep -q "100" ||
log_fail "project id 100 usage should be accounted for $TESTPOOL/fs3"

# xattr inodes should be accounted in project quota
dirino=$(stat -c '%i' $TESTDIR/fs3/dir)
log_must zdb -ddddd $TESTPOOL/fs3 $dirino
xattrdirino=$(zdb -ddddd $TESTPOOL/fs3 $dirino |grep -w "xattr" |awk '{print $2}')
Expand All @@ -129,15 +116,4 @@ cnt=$(get_prop projectobjused@100 $TESTPOOL/fs3)
[[ $cnt -ne $expectedcnt ]] &&
log_fail "projectquota accounting failed $cnt"

# All in all, after having been through this, the dataset for testpool
# still shouldn't be upgraded
zfs projectspace -o used $TESTPOOL | grep -q "USED" &&
log_fail "project quota should be disabled for $TESTPOOL"

# Manual upgrade root dataset
# uses an ioctl which will wait for the upgrade to be done before returning
log_must zfs set version=current $TESTPOOL
zfs projectspace -o used $TESTPOOL | grep -q "USED" ||
log_fail "project quota should be enabled for $TESTPOOL"

log_pass "Project Quota upgrade done"

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