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authorJeff Mahoney <jeffm@suse.com>2016-06-15 10:25:38 -0400
committerDavid Sterba <dsterba@suse.com>2016-07-26 13:54:24 +0200
commit14a1e067b45614d6236e3c82b36f62caef44ac62 (patch)
tree2efadf6e036988c7b3f9d3d8e120b76db51b29e8 /fs/btrfs
parent0c83b62e2222a8872f0b65d50540fdfa53b675ff (diff)
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: Jeff Mahoney <jeffm@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs')
-rw-r--r--fs/btrfs/ctree.h8
-rw-r--r--fs/btrfs/extent-tree.c2
-rw-r--r--fs/btrfs/file-item.c5
-rw-r--r--fs/btrfs/volumes.c3
4 files changed, 8 insertions, 10 deletions
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 950e4ee6b66e..1d46ceec1fc0 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -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))
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index c4487e177234..44549d706dcd 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -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);
diff --git a/fs/btrfs/file-item.c b/fs/btrfs/file-item.c
index 6b58d0620e2f..cdbbf85a269b 100644
--- a/fs/btrfs/file-item.c
+++ b/fs/btrfs/file-item.c
@@ -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))
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 5e409e28a5c0..104a2e42ed71 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -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)