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Updates for snapshots_changed property 

Currently, snapshots_changed property is stored in dd_props_zapobj, due
to which the property is assumed to be local. This causes a difference
in behavior with respect to other readonly properties.

This commit stores the snapshots_changed property in dd_object. Source
is not set to local in this case, which makes it consistent with other
readonly properties.

This commit also updates the date string format to include seconds.

Reviewed-by: Ryan Moeller <ryan@iXsystems.com>
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Signed-off-by: Umer Saleem <usaleem@ixsystems.com>
Closes #13785
This commit is contained in:
Umer Saleem 2022-08-25 02:20:43 +05:00 committed by GitHub
parent 0c4064d9a0
commit a582d52993
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GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 26 additions and 14 deletions
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2
lib/libzfs/libzfs_dataset.c
View File

@ -2947,7 +2947,7 @@ zfs_prop_get(zfs_handle_t *zhp, zfs_prop_t prop, char *propbuf, size_t proplen,
if (literal ||
localtime_r(&time, &t) == NULL ||
strftime(propbuf, proplen, "%a %b %e %k:%M %Y",
strftime(propbuf, proplen, "%a %b %e %k:%M:%S %Y",
&t) == 0)
(void) snprintf(propbuf, proplen, "%llu",
(u_longlong_t)val);

3
man/man7/zfsprops.7
View File

@ -526,6 +526,9 @@ Specifies the time at which a snapshot for a dataset was last
created or deleted.
.Pp
This allows us to be more efficient how often we query snapshots.
The property is persistent across mount and unmount operations only if the
.Sy extensible_dataset
feature is enabled.
.It Sy volblocksize
For volumes, specifies the block size of the volume.
The

35
module/zfs/dsl_dir.c
View File

@ -268,13 +268,15 @@ dsl_dir_hold_obj(dsl_pool_t *dp, uint64_t ddobj,
}
}
inode_timespec_t t = {0};
zap_lookup(dd->dd_pool->dp_meta_objset,
dsl_dir_phys(dd)->dd_props_zapobj,
zfs_prop_to_name(ZFS_PROP_SNAPSHOTS_CHANGED),
sizeof (uint64_t),
sizeof (inode_timespec_t) / sizeof (uint64_t), &t);
dd->dd_snap_cmtime = t;
if (dsl_dir_is_zapified(dd)) {
inode_timespec_t t = {0};
zap_lookup(dp->dp_meta_objset, ddobj,
zfs_prop_to_name(ZFS_PROP_SNAPSHOTS_CHANGED),
sizeof (uint64_t),
sizeof (inode_timespec_t) / sizeof (uint64_t),
&t);
dd->dd_snap_cmtime = t;
}
dmu_buf_init_user(&dd->dd_dbu, NULL, dsl_dir_evict_async,
&dd->dd_dbuf);
@ -2251,16 +2253,23 @@ dsl_dir_snap_cmtime(dsl_dir_t *dd)
void
dsl_dir_snap_cmtime_update(dsl_dir_t *dd, dmu_tx_t *tx)
{
dsl_pool_t *dp = dmu_tx_pool(tx);
inode_timespec_t t;
objset_t *mos = dd->dd_pool->dp_meta_objset;
uint64_t zapobj = dsl_dir_phys(dd)->dd_props_zapobj;
const char *prop_name = zfs_prop_to_name(ZFS_PROP_SNAPSHOTS_CHANGED);
gethrestime(&t);
mutex_enter(&dd->dd_lock);
dd->dd_snap_cmtime = t;
VERIFY0(zap_update(mos, zapobj, prop_name, sizeof (uint64_t),
sizeof (inode_timespec_t) / sizeof (uint64_t), &t, tx));
if (spa_feature_is_enabled(dp->dp_spa,
SPA_FEATURE_EXTENSIBLE_DATASET)) {
objset_t *mos = dd->dd_pool->dp_meta_objset;
uint64_t ddobj = dd->dd_object;
dsl_dir_zapify(dd, tx);
VERIFY0(zap_update(mos, ddobj,
zfs_prop_to_name(ZFS_PROP_SNAPSHOTS_CHANGED),
sizeof (uint64_t),
sizeof (inode_timespec_t) / sizeof (uint64_t),
&t, tx));
}
mutex_exit(&dd->dd_lock);
}