K 10
svn:author
V 3
mjg
K 8
svn:date
V 27
2020-10-09T20:31:42.827355Z
K 7
svn:log
V 285
vfs: fix a panic when truncating comming from copy_file_range

Truncating requires an exclusive lock, but it was not taken if the
filesystem indicates support for shared writes. This only concerns
ZFS.

In particular fixes cp of files which have trailing holes.

Reported by:	bdrewery

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