path: root/cmds-check.c
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authorJosef Bacik <>2013-03-22 10:52:07 -0400
committerChris Mason <>2013-06-19 13:35:15 -0400
commitbd338824de665c0ccef576ccd119cfc7dace829c (patch)
tree01a9edee7ffec12cf165d3e42a3733278f74e5c3 /cmds-check.c
parent650e656a8b9c1fbe4ec5cd8c48ae285b8abd3b69 (diff)
Btrfs-image: add the ability to santize file names when making an image
We've had a few users who wouldn't (or couldn't) provide us btrfs-images because we maintain the file names when making an image. So introduce a sanitize option. There are two uses, one that is fast and the other that is dog slow. The fast way just generates garbage that's equal in length to the original name. The slow way will try and find a crc32c collision for the file name that is also the same length. Finding a crc32c collision for the file name "btrfs-progs" on my box without CPU crc32c support takes a little more than 3 minutes, and a little less than 2 minutes for my box that has CPU crc32c support, so it's a lengthy and CPU intensive process. The idea is that we use -s for most cases, and then only use -ss when we need the file system tree to be somewhat sane. I could probably do a better job about finding collisions, but I'll have to revist that later. Thanks, Signed-off-by: Josef Bacik <> Signed-off-by: Chris Mason <>
Diffstat (limited to 'cmds-check.c')
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