Btrfs: don't use crc items bigger than 4KB
With the big metadata blocks, we can have crc items that are much bigger than a page. There are a few places that we try to kmalloc memory to hold the items during a split. Items bigger than 4KB don't really have a huge benefit in efficiency, but they do trigger larger order allocations. This commits changes the csums to make sure they stay under 4KB. This is not a format change, just a #define to limit huge items. Signed-off-by: Chris Mason <chris.mason@oracle.com>
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@ -25,10 +25,12 @@
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#include "transaction.h"
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#include "print-tree.h"
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#define MAX_CSUM_ITEMS(r, size) ((((BTRFS_LEAF_DATA_SIZE(r) - \
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#define __MAX_CSUM_ITEMS(r, size) ((((BTRFS_LEAF_DATA_SIZE(r) - \
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sizeof(struct btrfs_item) * 2) / \
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size) - 1))
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#define MAX_CSUM_ITEMS(r, size) (min(__MAX_CSUM_ITEMS(r, size), PAGE_CACHE_SIZE))
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#define MAX_ORDERED_SUM_BYTES(r) ((PAGE_SIZE - \
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sizeof(struct btrfs_ordered_sum)) / \
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sizeof(struct btrfs_sector_sum) * \
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