diff options
Diffstat (limited to 'Utility/InodeCache.hs')
| -rw-r--r-- | Utility/InodeCache.hs | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/Utility/InodeCache.hs b/Utility/InodeCache.hs index a24bce546..c142114cb 100644 --- a/Utility/InodeCache.hs +++ b/Utility/InodeCache.hs @@ -28,10 +28,17 @@ compareStrong (InodeCache x) (InodeCache y) = x == y {- Weak comparison of the inode caches, comparing the size and mtime, - but not the actual inode. Useful when inodes have changed, perhaps - - due to some filesystems being remounted. -} + - due to some filesystems being remounted. + - + - The weak mtime comparison treats any mtimes that are within 2 seconds + - of one-anther as the same. This is because FAT has only a 2 second + - resolution. When a FAT filesystem is used on Linux, higher resolution + - timestamps are cached and used by Linux, but this is lost on unmount, + - so after a remount, the timestamp can appear to have changed. + -} compareWeak :: InodeCache -> InodeCache -> Bool compareWeak (InodeCache (InodeCachePrim _ size1 mtime1)) (InodeCache (InodeCachePrim _ size2 mtime2)) = - size1 == size2 && mtime1 == mtime2 + size1 == size2 && (abs (mtime1 - mtime2) < 2) compareBy :: InodeComparisonType -> InodeCache -> InodeCache -> Bool compareBy Strongly = compareStrong |