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Add prefetch property

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ZFS prefetch is currently governed by the zfs_prefetch_disable
tunable. However, this is a module-wide settings - if a specific
dataset benefits from prefetch, while others have issue with it,
an optimal solution does not exists.

This commit introduce the "prefetch" tri-state property, which enable
granular control (at dataset/volume level) for prefetching.

This patch does not remove the zfs_prefetch_disable, which remains
a system-wide switch for enable/disable prefetch. However, to avoid
duplication, it would be preferable to deprecate and then remove
the module tunable.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Reviewed-by: Ameer Hamza <ahamza@ixsystems.com>
Signed-off-by: Gionatan Danti <g.danti@assyoma.it>
Co-authored-by: Gionatan Danti <g.danti@assyoma.it>
Closes #15237 
Closes #15436
This commit is contained in:
Brian Behlendorf
2023-10-24 11:00:07 -07:00
committed by GitHub
parent e57909265b
commit 07345ac252
7 changed files with 63 additions and 2 deletions
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lib/libzfs/libzfs.abi
+2 -1
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@@ -1867,7 +1867,8 @@
<enumerator name='ZFS_PROP_REDACTED' value='93'/>
<enumerator name='ZFS_PROP_REDACT_SNAPS' value='94'/>
<enumerator name='ZFS_PROP_SNAPSHOTS_CHANGED' value='95'/>
<enumerator name='ZFS_NUM_PROPS' value='96'/>
<enumerator name='ZFS_PROP_PREFETCH' value='96'/>
<enumerator name='ZFS_NUM_PROPS' value='97'/>
</enum-decl>
<typedef-decl name='zfs_prop_t' type-id='4b000d60' id='58603c44'/>
<enum-decl name='zprop_source_t' naming-typedef-id='a2256d42' id='5903f80e'>