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dea8fabf73
ZFS implements copy_file_range(2) using block cloning when possible. This implementation must respect the RLIMIT_FSIZE limit. zfs_clone_range() already checks the limit, so it is safe to remove this check in zfs_freebsd_copy_file_range(). Moreover, the removed check produces false positives: the length passed to copy_file_range(2) may be larger than the input file size; as the man page notes, "for best performance, call copy_file_range() with the largest len value possible." In particular, some existing code passes SSIZE_MAX there. The check in zfs_clone_range() clamps the length to the input file's size before checking, but the removed check uses the caller supplied length, so something like $ echo a > /tmp/foo $ limits -f 1024 cat /tmp/foo > /tmp/bar fails because FreeBSD's cat(1) uses copy_file_range(2) in the manner described above. Reported-by: Philip Paeps <philip@FreeBSD.org> Signed-off-by: Mark Johnston <markj@FreeBSD.org> Reviewed-by: Alexander Motin <mav@FreeBSD.org> Reviewed-by: Allan Jude <allan@klarasystems.com> Reviewed-by: Tino Reichardt <milky-zfs@mcmilk.de> Reviewed-by: Tony Hutter <hutter2@llnl.gov> |
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