On 30 Nov 2023, at 5:18, Cedric Blancher wrote: > Good morning! > > Linux has fallocate(fd, FALLOC_FL_PUNCH_HOLE|FALLOC_FL_KEEP_SIZE, ...) > to punch a hole into a file, i.e. deallocate the blocks given and make > the file a "sparse file". > > But how is this implemented on NFSv4.2 COMPOUND level? How does a > NFSv4 compound look like to punch a hole say from position 30000 to > position 35721? Are you interested in the current linux client's implementation? You could look at a wire capture of the operation to find out. Its going to be something like PUTFH, DEALLOCATE, GETATTR.. Ben
