btrfs: add wrapper for counting BTRFS_MAX_EXTENT_SIZE

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The expression is open-coded in several places, this asks for a wrapper.
As we know the MAX_EXTENT fits to u32, we can use the appropirate
division helper. This cascades to the result type updates.

Compiler is clever enough to use shift instead of integer division, so
there's no change in the generated assembly.

Signed-off-by: David Sterba <dsterba@suse.com>

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This commit is contained in:

David Sterba 2017-01-04 11:09:51 +01:00

parent 95995dbbe6

commit 823bb20ab4

3 changed files with 23 additions and 31 deletions

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8

fs/btrfs/ctree.h

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12

fs/btrfs/extent-tree.c

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34

fs/btrfs/inode.c

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