Some time ago I asked how to check how many extents a file has
got, and there isn't yet a specific JFS utility for that, and
one has to muck around with 'jfs_debugfs'.

However, I just discovered that the 'filefrag' command from
'e2fsprogs' work with JFS and any other file system that
supports the FIBMAP 'ioctl'.

It is a bit crude, but usable.

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