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author | Jaegeuk Kim <jaegeuk.kim@samsung.com> | 2013-02-26 13:10:46 +0900 |
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committer | Jaegeuk Kim <jaegeuk.kim@samsung.com> | 2013-03-18 21:00:33 +0900 |
commit | 266e97a81cf73d1a0dac5f68391da382630a80b7 (patch) | |
tree | e5c335396c512c72d5c324f789a8ddae93340b0c /fs/f2fs/f2fs.h | |
parent | 66d36a2944df461448159be5af13049dd2689e77 (diff) | |
download | linux-266e97a81cf73d1a0dac5f68391da382630a80b7.tar.bz2 |
f2fs: introduce readahead mode of node pages
Previously, f2fs reads several node pages ahead when get_dnode_of_data is called
with RDONLY_NODE flag.
And, this flag is set by the following functions.
- get_data_block_ro
- get_lock_data_page
- do_write_data_page
- truncate_blocks
- truncate_hole
However, this readahead mechanism is initially introduced for the use of
get_data_block_ro to enhance the sequential read performance.
So, let's clarify all the cases with the additional modes as follows.
enum {
ALLOC_NODE, /* allocate a new node page if needed */
LOOKUP_NODE, /* look up a node without readahead */
LOOKUP_NODE_RA, /*
* look up a node with readahead called
* by get_datablock_ro.
*/
}
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
Reviewed-by: Namjae Jeon <namjae.jeon@samsung.com>
Diffstat (limited to 'fs/f2fs/f2fs.h')
-rw-r--r-- | fs/f2fs/f2fs.h | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h index cc2213afdcc7..be7ae70b0b1d 100644 --- a/fs/f2fs/f2fs.h +++ b/fs/f2fs/f2fs.h @@ -125,11 +125,15 @@ static inline int update_sits_in_cursum(struct f2fs_summary_block *rs, int i) * file keeping -1 as its node offset to * distinguish from index node blocks. */ -#define RDONLY_NODE 1 /* - * specify a read-only mode when getting - * a node block. 0 is read-write mode. - * used by get_dnode_of_data(). +enum { + ALLOC_NODE, /* allocate a new node page if needed */ + LOOKUP_NODE, /* look up a node without readahead */ + LOOKUP_NODE_RA, /* + * look up a node with readahead called + * by get_datablock_ro. */ +}; + #define F2FS_LINK_MAX 32000 /* maximum link count per file */ /* for in-memory extent cache entry */ |