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zfs_file: implement zfs_file_deallocate for FreeBSD 14
FreeBSD 14 gained a `VOP_DEALLOCATE` VFS operation and a `fspacectl` syscall to use it. At minimum, these zero the given region, and if the underlying filesystem supports it, can make the region sparse. We can use this to get TRIM-like behaviour for file vdevs. Sponsored-by: https://despairlabs.com/sponsor/ Signed-off-by: Rob Norris <[email protected]>
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