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| author | Fan Li <fanofcode.li@samsung.com> | 2017-10-30 15:19:48 +0800 |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk@kernel.org> | 2017-11-05 16:42:00 -0800 |
| commit | 37a0ab2a3b58d8b922393717442e1f4d4196282e (patch) | |
| tree | 8f0338556dbe59fe2b7bb81a569ff761c10b3d83 /fs/f2fs | |
| parent | f15194fcfa6bfcb2a4b8dc49fc8c7af2d952e530 (diff) | |
| download | linux-37a0ab2a3b58d8b922393717442e1f4d4196282e.tar.gz linux-37a0ab2a3b58d8b922393717442e1f4d4196282e.tar.bz2 linux-37a0ab2a3b58d8b922393717442e1f4d4196282e.zip | |
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>
Diffstat (limited to 'fs/f2fs')
| -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 c90e667885f7..a7f6603bfbea 100644 --- a/fs/f2fs/node.c +++ b/fs/f2fs/node.c @@ -2421,15 +2421,17 @@ 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) { |