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f2fs: introduce readahead mode of node pages

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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>
This commit is contained in:
Jaegeuk Kim
2013-02-26 13:10:46 +09:00
parent 66d36a2944
commit 266e97a81c
5 changed files with 22 additions and 18 deletions
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12
fs/f2fs/data.c
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@@ -183,7 +183,7 @@ struct page *find_data_page(struct inode *inode, pgoff_t index)
f2fs_put_page(page, 0);
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)
return ERR_PTR(err);
f2fs_put_dnode(&dn);
@@ -222,7 +222,7 @@ struct page *get_lock_data_page(struct inode *inode, pgoff_t index)
int err;
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)
return ERR_PTR(err);
f2fs_put_dnode(&dn);
@@ -262,7 +262,7 @@ struct page *get_new_data_page(struct inode *inode, pgoff_t index,
int err;
set_new_dnode(&dn, inode, NULL, NULL, 0);
err = get_dnode_of_data(&dn, index, 0);
err = get_dnode_of_data(&dn, index, ALLOC_NODE);
if (err)
return ERR_PTR(err);
@@ -392,7 +392,7 @@ static int get_data_block_ro(struct inode *inode, sector_t iblock,
/* When reading holes, we need its node page */
set_new_dnode(&dn, inode, NULL, NULL, 0);
err = get_dnode_of_data(&dn, pgofs, RDONLY_NODE);
err = get_dnode_of_data(&dn, pgofs, LOOKUP_NODE_RA);
if (err)
return (err == -ENOENT) ? 0 : err;
@@ -443,7 +443,7 @@ int do_write_data_page(struct page *page)
int err = 0;
set_new_dnode(&dn, inode, NULL, NULL, 0);
err = get_dnode_of_data(&dn, page->index, RDONLY_NODE);
err = get_dnode_of_data(&dn, page->index, LOOKUP_NODE);
if (err)
return err;
@@ -607,7 +607,7 @@ static int f2fs_write_begin(struct file *file, struct address_space *mapping,
mutex_lock_op(sbi, DATA_NEW);
set_new_dnode(&dn, inode, NULL, NULL, 0);
err = get_dnode_of_data(&dn, index, 0);
err = get_dnode_of_data(&dn, index, ALLOC_NODE);
if (err) {
mutex_unlock_op(sbi, DATA_NEW);
f2fs_put_page(page, 1);