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Commit 14a1e067 authored by Jeff Mahoney's avatar Jeff Mahoney Committed by David Sterba
Browse files

btrfs: introduce BTRFS_MAX_ITEM_SIZE 



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: default avatarJeff Mahoney <jeffm@suse.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent 0c83b62e

fs/btrfs/ctree.h

+4 −4
Original line number Diff line number Diff line
@@ -150,13 +150,13 @@ struct btrfs_header { 
				     sizeof(struct btrfs_key_ptr))

#define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))

#define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->nodesize))

#define BTRFS_MAX_ITEM_SIZE(r) \

	(BTRFS_LEAF_DATA_SIZE(r) - sizeof(struct btrfs_item))

#define BTRFS_FILE_EXTENT_INLINE_DATA_START		\

		(offsetof(struct btrfs_file_extent_item, disk_bytenr))

#define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \

					sizeof(struct btrfs_item) - \

#define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_MAX_ITEM_SIZE(r) - \

					BTRFS_FILE_EXTENT_INLINE_DATA_START)

#define BTRFS_MAX_XATTR_SIZE(r)	(BTRFS_LEAF_DATA_SIZE(r) - \

				 sizeof(struct btrfs_item) -\

#define BTRFS_MAX_XATTR_SIZE(r)	(BTRFS_MAX_ITEM_SIZE(r) - \

				 sizeof(struct btrfs_dir_item))

fs/btrfs/extent-tree.c

+1 −1
Original line number Diff line number Diff line
@@ -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);

fs/btrfs/file-item.c

+2 −3
Original line number Diff line number Diff line
@@ -27,9 +27,8 @@ 
#include "print-tree.h"

#include "compression.h"



#define __MAX_CSUM_ITEMS(r, size) ((unsigned long)(((BTRFS_LEAF_DATA_SIZE(r) - \

				   sizeof(struct btrfs_item) * 2) / \

				  size) - 1))

#define __MAX_CSUM_ITEMS(r, size) \

	((unsigned long)(((BTRFS_MAX_ITEM_SIZE(r) * 2) / size) - 1))



#define MAX_CSUM_ITEMS(r, size) (min_t(u32, __MAX_CSUM_ITEMS(r, size), \

				       PAGE_SIZE))

fs/btrfs/volumes.c

+1 −2
Original line number Diff line number Diff line
@@ -4573,8 +4573,7 @@ static void check_raid56_incompat_flag(struct btrfs_fs_info *info, u64 type) 
	btrfs_set_fs_incompat(info, RAID56);

}



#define BTRFS_MAX_DEVS(r) ((BTRFS_LEAF_DATA_SIZE(r)		\

			- sizeof(struct btrfs_item)		\

#define BTRFS_MAX_DEVS(r) ((BTRFS_MAX_ITEM_SIZE(r)		\

			- sizeof(struct btrfs_chunk))		\

			/ sizeof(struct btrfs_stripe) + 1)