LU-16896 flr: resync could mess mirror content

LU-16896 flr: resync could mess mirror content

This could happens in this case: a component with extent [0, 0x1000)
being synced with another mirror with data in [0x100, 0x200) and file
size is 0x300.

The out-of-sync mirror will get punched in [0, 0x100) and data being
correctly written in [0x100, 0x200), but will be missed the punch in
[0x200, 0x300) even though it can be correctly truncated at 0x300.

Fixes: b9ce342ee1 ("LU-16896 flr: resync should not change file size")
Signed-off-by: Bobi Jam <bobijam@whamcloud.com>
Change-Id: If81433260f42c6161a53157cc0dd9d115eabbfb9
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/52489
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Mikhail Pershin <mpershin@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>