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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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man/man7/zfsprops.7
+17
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@@ -1613,6 +1613,23 @@ If this property is set to
then only metadata is cached.
The default value is
.Sy all .
.It Sy prefetch Ns = Ns Sy all Ns | Ns Sy none Ns | Ns Sy metadata
Controls what speculative prefetch does.
If this property is set to
.Sy all ,
then both user data and metadata are prefetched.
If this property is set to
.Sy none ,
then neither user data nor metadata are prefetched.
If this property is set to
.Sy metadata ,
then only metadata are prefetched.
The default value is
.Sy all .
.Pp
Please note that the module parameter zfs_disable_prefetch=1 can
be used to totally disable speculative prefetch, bypassing anything
this property does.
.It Sy setuid Ns = Ns Sy on Ns | Ns Sy off
Controls whether the setuid bit is respected for the file system.
The default value is