diff options
| author | Fan Li <fanofcode.li@samsung.com> | 2017-10-30 15:19:48 +0800 |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk@kernel.org> | 2017-11-15 22:02:23 -0800 |
| commit | ddb8e2ae9811a6e1a186e1366db817924231842e (patch) | |
| tree | 0f941e7b6a2408635632749c8f6b0ad12721cc5d | |
| parent | f46ae958c701e580c4405c7b455438980d78585a (diff) | |
f2fs: optimize __update_nat_bits
Make three modification for __update_nat_bits:
1. Take the codes of dealing the nat with nid 0 out of the loop
Such nat only needs to be dealt with once at beginning.
2. Use " nat_index == 0" instead of " start_nid == 0" to decide if it's the first nat block
It's better that we don't assume @start_nid is the first nid of the nat block it's in.
3. Use " if (nat_blk->entries[i].block_addr != NULL_ADDR)" to explicitly comfirm the value of block_addr
use constant to make sure the codes is right, even if the value of NULL_ADDR changes.
Signed-off-by: Fan li <fanofcode.li@samsung.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
| -rw-r--r-- | fs/f2fs/node.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c index 99c966fcf32d..09707de3c9c5 100644 --- a/fs/f2fs/node.c +++ b/fs/f2fs/node.c @@ -2424,15 +2424,17 @@ static void __update_nat_bits(struct f2fs_sb_info *sbi, nid_t start_nid, unsigned int nat_index = start_nid / NAT_ENTRY_PER_BLOCK; struct f2fs_nat_block *nat_blk = page_address(page); int valid = 0; - int i; + int i = 0; if (!enabled_nat_bits(sbi, NULL)) return; - for (i = 0; i < NAT_ENTRY_PER_BLOCK; i++) { - if (start_nid == 0 && i == 0) - valid++; - if (nat_blk->entries[i].block_addr) + if (nat_index == 0) { + valid = 1; + i = 1; + } + for (; i < NAT_ENTRY_PER_BLOCK; i++) { + if (nat_blk->entries[i].block_addr != NULL_ADDR) valid++; } if (valid == 0) { |