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This adds an interface to "punch holes" (deallocate space) in VFS files. The interface is identical to the Solaris
VOP_SPACE
interface. This interface is necessary for TRIM support on file vdevs (see openzfs/zfs#924).This is implemented using Linux
fallocate(FALLOC_FL_PUNCH_HOLE)
, which was introduced in 2.6.38. For a brief time before 2.6.38 this was done using thetruncate_range
inode operation, which was quickly deprecated. This patch only supportsFALLOC_FL_PUNCH_HOLE
.@behlendorf: like the previous patch, you can either wait for ZFS TRIM support to be finished or you can merge this now. Your call.