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btrfs: introduce BTRFS_MAX_ITEM_SIZE

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We use BTRFS_LEAF_DATA_SIZE - sizeof(struct btrfs_item) in
several places.  This introduces a BTRFS_MAX_ITEM_SIZE macro to do the
same.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Jeff Mahoney
2016-06-15 10:25:38 -04:00
committed by David Sterba
parent 0c83b62e22
commit 14a1e067b4
4 changed files with 8 additions and 10 deletions
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2
fs/btrfs/extent-tree.c
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@@ -2779,7 +2779,7 @@ u64 btrfs_csum_bytes_to_leaves(struct btrfs_root *root, u64 csum_bytes)
u64 num_csums_per_leaf;
u64 num_csums;
csum_size = BTRFS_LEAF_DATA_SIZE(root) - sizeof(struct btrfs_item);
csum_size = BTRFS_MAX_ITEM_SIZE(root);
num_csums_per_leaf = div64_u64(csum_size,
(u64)btrfs_super_csum_size(root->fs_info->super_copy));
num_csums = div64_u64(csum_bytes, root->sectorsize);