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authorJustin Maggard <jmaggard10@gmail.com>2014-01-21 11:18:29 -0800
committerChris Mason <clm@fb.com>2014-01-28 13:20:43 -0800
commitc41570c9d29764f797fa35490d72b7395a0105c3 (patch)
tree899a43d2fe64b55478215fbb061f963cd87cf549 /fs/minix
parentc736c095de53c1a0a23909239d69bb56693df8ef (diff)
btrfs: fix defrag 32-bit integer overflow
When defragging a very large file, the cluster variable can wrap its 32-bit signed int type and become negative, which eventually gets passed to btrfs_force_ra() as a very large unsigned long value. On 32-bit platforms, this eventually results in an Oops from the SLAB allocator. Change the cluster and max_cluster signed int variables to unsigned long to match the readahead functions. This also allows the min() comparison in btrfs_defrag_file() to work as intended. Signed-off-by: Josef Bacik <jbacik@fb.com> Signed-off-by: Chris Mason <clm@fb.com>
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