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| author | Theodore Ts'o <tytso@mit.edu> | 2013-08-17 05:23:41 +0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2013-08-17 05:23:41 +0400 |
| commit | 107a7bd31ac003e42c0f966aa8e5b26947de6024 (patch) | |
| tree | eb1484facfcba3e07b64d8775fa91fbe45591ab1 /fs/ext4/ext4.h | |
| parent | 3be78c73179c9347bdc0a92b2898063bd2300ff7 (diff) | |
| download | linux-107a7bd31ac003e42c0f966aa8e5b26947de6024.tar.xz | |
ext4: cache all of an extent tree's leaf block upon reading
When we read in an extent tree leaf block from disk, arrange to have
all of its entries cached. In nearly all cases the in-memory
representation will be more compact than the on-disk representation in
the buffer cache, and it allows us to get the information without
having to traverse the extent tree for successive extents.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Reviewed-by: Zheng Liu <wenqing.lz@taobao.com>
Diffstat (limited to 'fs/ext4/ext4.h')
| -rw-r--r-- | fs/ext4/ext4.h | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index 0ab26fbf3380..c74b1948feb0 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -561,6 +561,17 @@ enum { #define EXT4_GET_BLOCKS_NO_PUT_HOLE 0x0200 /* + * The bit position of this flag must not overlap with any of the + * EXT4_GET_BLOCKS_*. It is used by ext4_ext_find_extent(), + * read_extent_tree_block(), ext4_split_extent_at(), + * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf() to + * indicate that the we shouldn't be caching the extents when reading + * from the extent tree while a truncate or punch hole operation + * is in progress. + */ +#define EXT4_EX_NOCACHE 0x0400 + +/* * Flags used by ext4_free_blocks */ #define EXT4_FREE_BLOCKS_METADATA 0x0001 @@ -2684,7 +2695,8 @@ extern int ext4_ext_insert_extent(handle_t *, struct inode *, struct ext4_ext_path *, struct ext4_extent *, int); extern struct ext4_ext_path *ext4_ext_find_extent(struct inode *, ext4_lblk_t, - struct ext4_ext_path *); + struct ext4_ext_path *, + int flags); extern void ext4_ext_drop_refs(struct ext4_ext_path *); extern int ext4_ext_check_inode(struct inode *inode); extern int ext4_find_delalloc_range(struct inode *inode, |