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Create an 'overlay' property

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Add a new 'overlay' property (default 'off') that controls whether the
filesystem should be mounted even if the mountpoint is busy or if it
should fail with a 'mountpoint not empty'.

Doing overlay mounts is the default mount behavior on Linux, but not
in ZFS. It have been decided that following the ZFS behavior should
be the default, but this overlay allows for site administrator to
override this decision on a per-dataset basis.

Signed-off-by: Turbo Fredriksson <turbo@bayour.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes: #2503
This commit is contained in:
Turbo Fredriksson
2014-07-25 12:42:00 +02:00
committed by Brian Behlendorf
parent 194e56234a
commit f67d709080
4 changed files with 28 additions and 0 deletions
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include/sys/fs/zfs.h
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@@ -150,6 +150,7 @@ typedef enum {
ZFS_PROP_SELINUX_ROOTCONTEXT,
ZFS_PROP_RELATIME,
ZFS_PROP_REDUNDANT_METADATA,
ZFS_PROP_OVERLAY,
ZFS_NUM_PROPS
} zfs_prop_t;