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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 Tony Hutter
parent 706307445e
commit 61f3638a34
7 changed files with 63 additions and 2 deletions
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include/sys/fs/zfs.h
+7
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@@ -191,6 +191,7 @@ typedef enum {
ZFS_PROP_REDACTED,
ZFS_PROP_REDACT_SNAPS,
ZFS_PROP_SNAPSHOTS_CHANGED,
ZFS_PROP_PREFETCH,
ZFS_NUM_PROPS
} zfs_prop_t;
@@ -546,6 +547,12 @@ typedef enum zfs_key_location {
ZFS_KEYLOCATION_LOCATIONS
} zfs_keylocation_t;
typedef enum {
ZFS_PREFETCH_NONE = 0,
ZFS_PREFETCH_METADATA = 1,
ZFS_PREFETCH_ALL = 2
} zfs_prefetch_type_t;
#define DEFAULT_PBKDF2_ITERATIONS 350000
#define MIN_PBKDF2_ITERATIONS 100000