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f2fs: use extent cache to optimize f2fs_reserve_block

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In some cases, we only need the block address when we call
f2fs_reserve_block,
other fields of struct dnode_of_data aren't necessary.
We can try extent cache first for such cases in order to speed up the
process.

Signed-off-by: Fan li <fanofcode.li@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Fan Li 2015-08-05 15:52:16 +08:00 committed by Jaegeuk Kim
parent e90c2d2850
commit 759af1c9c1
2 changed files with 16 additions and 1 deletions
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16
fs/f2fs/data.c
View File

@ -263,6 +263,19 @@ int f2fs_reserve_block(struct dnode_of_data *dn, pgoff_t index)
return err;
}
int f2fs_get_block(struct dnode_of_data *dn, pgoff_t index)
{
struct extent_info ei;
struct inode *inode = dn->inode;
if (f2fs_lookup_extent_cache(inode, index, &ei)) {
dn->data_blkaddr = ei.blk + index - ei.fofs;
return 0;
}
return f2fs_reserve_block(dn, index);
}
struct page *get_read_data_page(struct inode *inode, pgoff_t index, int rw)
{
struct address_space *mapping = inode->i_mapping;
@ -1383,7 +1396,8 @@ repeat:
if (err)
goto put_fail;
}
err = f2fs_reserve_block(&dn, index);
err = f2fs_get_block(&dn, index);
if (err)
goto put_fail;
put_next:

1
fs/f2fs/f2fs.h
View File

@ -1768,6 +1768,7 @@ int f2fs_submit_page_bio(struct f2fs_io_info *);
void f2fs_submit_page_mbio(struct f2fs_io_info *);
void set_data_blkaddr(struct dnode_of_data *);
int reserve_new_block(struct dnode_of_data *);
int f2fs_get_block(struct dnode_of_data *, pgoff_t);
int f2fs_reserve_block(struct dnode_of_data *, pgoff_t);
struct page *get_read_data_page(struct inode *, pgoff_t, int);
struct page *find_data_page(struct inode *, pgoff_t);