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f2fs: remain nat cache entries for further free nid allocation 

In the checkpoint flow, the f2fs investigates the total nat cache entries.
Previously, if an entry has NULL_ADDR, f2fs drops the entry and adds the
obsolete nid to the free nid list.
However, this free nid will be reused sooner, resulting in its nat entry miss.
In order to avoid this, we don't need to drop the nat cache entry at this moment.

Reviewed-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
This commit is contained in:
Jaegeuk Kim 2013-03-21 12:53:19 +09:00
parent 0ff153a2f1
commit fa37241743
1 changed files with 2 additions and 2 deletions
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4
fs/f2fs/node.c
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@ -1621,11 +1621,11 @@ void flush_nat_entries(struct f2fs_sb_info *sbi)
nid_in_journal(sum, offset) = cpu_to_le32(nid);
}
if (nat_get_blkaddr(ne) == NULL_ADDR) {
if (nat_get_blkaddr(ne) == NULL_ADDR &&
!add_free_nid(NM_I(sbi), nid)) {
write_lock(&nm_i->nat_tree_lock);
__del_from_nat_cache(nm_i, ne);
write_unlock(&nm_i->nat_tree_lock);
add_free_nid(NM_I(sbi), nid);
} else {
write_lock(&nm_i->nat_tree_lock);
__clear_nat_cache_dirty(nm_i, ne);