diff options
| author | LiFan <fanofcode.li@samsung.com> | 2017-11-10 10:41:42 +0300 |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk@kernel.org> | 2017-11-11 04:35:07 +0300 |
| commit | 0dd99ca76f473d488fa9acac67f6a42ca1d7d2b1 (patch) | |
| tree | 12e9e5ed429bbf978ea1306490623c2e2cf194d8 | |
| parent | 19526d74cfbe31b04fb81b64c2884687a321f4a0 (diff) | |
| download | linux-0dd99ca76f473d488fa9acac67f6a42ca1d7d2b1.tar.xz | |
f2fs: validate before set/clear free nat bitmap
In flush_nat_entries, all dirty nats will be flushed and if
their new address isn't NULL_ADDR, their bitmaps will be updated,
the free_nid_count of the bitmaps will be increaced regardless
of whether the nats have already been occupied before.
This could lead to wrong free_nid_count.
So this patch checks the status of the bits beforeactually
set/clear them.
Fixes: 586d1492f301 ("f2fs: skip scanning free nid bitmap of full NAT blocks")
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 | 17 |
1 files changed, 10 insertions, 7 deletions
diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c index d2530179cc9c..9abfdbb5aae5 100644 --- a/fs/f2fs/node.c +++ b/fs/f2fs/node.c @@ -1906,15 +1906,18 @@ static void update_free_nid_bitmap(struct f2fs_sb_info *sbi, nid_t nid, if (!test_bit_le(nat_ofs, nm_i->nat_block_bitmap)) return; - if (set) + if (set) { + if (test_bit_le(nid_ofs, nm_i->free_nid_bitmap[nat_ofs])) + return; __set_bit_le(nid_ofs, nm_i->free_nid_bitmap[nat_ofs]); - else - __clear_bit_le(nid_ofs, nm_i->free_nid_bitmap[nat_ofs]); - - if (set) nm_i->free_nid_count[nat_ofs]++; - else if (!build) - nm_i->free_nid_count[nat_ofs]--; + } else { + if (!test_bit_le(nid_ofs, nm_i->free_nid_bitmap[nat_ofs])) + return; + __clear_bit_le(nid_ofs, nm_i->free_nid_bitmap[nat_ofs]); + if (!build) + nm_i->free_nid_count[nat_ofs]--; + } } static void scan_nat_page(struct f2fs_sb_info *sbi, |