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f2fs: no need to read nat block if nat_block_bitmap is set 

No need to read nat block if nat_block_bitmap is set.

Signed-off-by: Yunlei He <heyunlei@huawei.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Yunlei He 2017-11-17 16:13:38 +08:00 committed by Jaegeuk Kim
parent 292c196a36
commit 66e8336137
1 changed files with 6 additions and 6 deletions
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12
fs/f2fs/node.c
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@ -1930,9 +1930,6 @@ static void scan_nat_page(struct f2fs_sb_info *sbi,
unsigned int nat_ofs = NAT_BLOCK_OFFSET(start_nid);
int i;
if (test_bit_le(nat_ofs, nm_i->nat_block_bitmap))
return;
__set_bit_le(nat_ofs, nm_i->nat_block_bitmap);
i = start_nid % NAT_ENTRY_PER_BLOCK;
@ -2037,10 +2034,13 @@ static void __build_free_nids(struct f2fs_sb_info *sbi, bool sync, bool mount)
down_read(&nm_i->nat_tree_lock);
while (1) {
struct page *page = get_current_nat_page(sbi, nid);
if (!test_bit_le(NAT_BLOCK_OFFSET(nid),
nm_i->nat_block_bitmap)) {
struct page *page = get_current_nat_page(sbi, nid);
scan_nat_page(sbi, page, nid);
f2fs_put_page(page, 1);
scan_nat_page(sbi, page, nid);
f2fs_put_page(page, 1);
}
nid += (NAT_ENTRY_PER_BLOCK - (nid % NAT_ENTRY_PER_BLOCK));
if (unlikely(nid >= nm_i->max_nid))