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Change default to overlay=on

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Filesystems allow overlay mounts by default on FreeBSD and Linux.

Respect the native convention by switching the default to overlay=on,
while retaining the option to turn the property off for compatibility
with other operating systems' conventions.

Update documentation and tests accordingly.

Reviewed-by: Richard Laager <rlaager@wiktel.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ryan Moeller <ryan@iXsystems.com>
Closes #10030
This commit is contained in:
Ryan Moeller
2020-03-06 12:28:19 -05:00
committed by GitHub
parent 788398c562
commit f5f6fb03b7
9 changed files with 53 additions and 64 deletions
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man/man8/zfsprops.8
+8 -6
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@@ -1157,14 +1157,16 @@ See
for more information on
.Sy nbmand
mounts. This property is not used on Linux.
.It Sy overlay Ns = Ns Sy off Ns | Ns Sy on
.It Sy overlay Ns = Ns Sy on Ns | Ns Sy off
Allow mounting on a busy directory or a directory which already contains
files or directories. This is the default mount behavior for Linux file systems.
For consistency with OpenZFS on other platforms overlay mounts are
.Sy off
by default. Set to
files or directories.
This is the default mount behavior for Linux and FreeBSD file systems.
On these platforms the property is
.Sy on
to enable overlay mounts.
by default.
Set to
.Sy off
to disable overlay mounts for consistency with OpenZFS on other platforms.
.It Sy primarycache Ns = Ns Sy all Ns | Ns Sy none Ns | Ns Sy metadata
Controls what is cached in the primary cache
.Pq ARC .