diff options
| author | Jaegeuk Kim <jaegeuk.kim@samsung.com> | 2013-02-26 13:10:46 +0900 |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk.kim@samsung.com> | 2013-03-18 21:00:33 +0900 |
| commit | 266e97a81cf73d1a0dac5f68391da382630a80b7 (patch) | |
| tree | e5c335396c512c72d5c324f789a8ddae93340b0c /fs/f2fs/file.c | |
| parent | 66d36a2944df461448159be5af13049dd2689e77 (diff) | |
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/file.c')
| -rw-r--r-- | fs/f2fs/file.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c index 958a46da19a..269645e2351 100644 --- a/fs/f2fs/file.c +++ b/fs/f2fs/file.c @@ -43,7 +43,7 @@ static int f2fs_vm_page_mkwrite(struct vm_area_struct *vma, /* block allocation */ set_new_dnode(&dn, inode, NULL, NULL, 0); - err = get_dnode_of_data(&dn, page->index, 0); + err = get_dnode_of_data(&dn, page->index, ALLOC_NODE); if (err) { mutex_unlock_op(sbi, DATA_NEW); goto out; @@ -258,7 +258,7 @@ static int truncate_blocks(struct inode *inode, u64 from) mutex_lock_op(sbi, DATA_TRUNC); set_new_dnode(&dn, inode, NULL, NULL, 0); - err = get_dnode_of_data(&dn, free_from, RDONLY_NODE); + err = get_dnode_of_data(&dn, free_from, LOOKUP_NODE); if (err) { if (err == -ENOENT) goto free_next; @@ -420,7 +420,7 @@ int truncate_hole(struct inode *inode, pgoff_t pg_start, pgoff_t pg_end) mutex_lock_op(sbi, DATA_TRUNC); set_new_dnode(&dn, inode, NULL, NULL, 0); - err = get_dnode_of_data(&dn, index, RDONLY_NODE); + err = get_dnode_of_data(&dn, index, LOOKUP_NODE); if (err) { mutex_unlock_op(sbi, DATA_TRUNC); if (err == -ENOENT) @@ -504,7 +504,7 @@ static int expand_inode_data(struct inode *inode, loff_t offset, mutex_lock_op(sbi, DATA_NEW); set_new_dnode(&dn, inode, NULL, NULL, 0); - ret = get_dnode_of_data(&dn, index, 0); + ret = get_dnode_of_data(&dn, index, ALLOC_NODE); if (ret) { mutex_unlock_op(sbi, DATA_NEW); break; |