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| author | Chris Mason <chris.mason@oracle.com> | 2012-03-03 12:40:03 (GMT) |
|---|---|---|
| committer | Chris Mason <chris.mason@oracle.com> | 2012-03-26 21:04:23 (GMT) |
| commit | cfed81a04eb555f5606d1b6a54bdbabab0ee1ac3 (patch) | |
| tree | 2a763276869693b21c0e3a14f725f642c1f27fd3 /fs/btrfs/ctree.h | |
| parent | 0b32f4bbb423f02acee6d43cd442f5f0775db7e0 (diff) | |
| download | linux-cfed81a04eb555f5606d1b6a54bdbabab0ee1ac3.tar.xz | |
Btrfs: add the ability to cache a pointer into the eb
This cuts down on the CPU time used by map_private_extent_buffer
Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/ctree.h')
| -rw-r--r-- | fs/btrfs/ctree.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index 85ab1c5..c2e17cd 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -1546,6 +1546,17 @@ struct btrfs_ioctl_defrag_range_args { #define BTRFS_INODE_ROOT_ITEM_INIT (1 << 31) +struct btrfs_map_token { + struct extent_buffer *eb; + char *kaddr; + unsigned long offset; +}; + +static inline void btrfs_init_map_token (struct btrfs_map_token *token) +{ + memset(token, 0, sizeof(*token)); +} + /* some macros to generate set/get funcs for the struct fields. This * assumes there is a lefoo_to_cpu for every type, so lets make a simple * one for u8: @@ -1569,6 +1580,8 @@ struct btrfs_ioctl_defrag_range_args { #ifndef BTRFS_SETGET_FUNCS #define BTRFS_SETGET_FUNCS(name, type, member, bits) \ u##bits btrfs_##name(struct extent_buffer *eb, type *s); \ +u##bits btrfs_token_##name(struct extent_buffer *eb, type *s, struct btrfs_map_token *token); \ +void btrfs_set_token_##name(struct extent_buffer *eb, type *s, u##bits val, struct btrfs_map_token *token);\ void btrfs_set_##name(struct extent_buffer *eb, type *s, u##bits val); #endif |