From: "LiFan" <fanofcode.li@samsung.com>
To: "'Chao Yu'" <chao@kernel.org>, "'Chao Yu'" <yuchao0@huawei.com>,
"'Jaegeuk Kim'" <jaegeuk@kernel.org>
Cc: <linux-kernel@vger.kernel.org>, <linux-f2fs-devel@lists.sourceforge.net>
Subject: [f2fs-dev] [PATCH RESEND] f2fs: validate before set/clear free nat bitmap
Date: Sat, 11 Nov 2017 16:25:21 +0800 [thread overview]
Message-ID: <000401d35ac6$b6c36700$244a3500$@samsung.com> (raw)
In-Reply-To: CGME20171111082604epcas5p472a0e6a07db371cb050eb6a13d8f0676@epcas5p4.samsung.com
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 increased 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 before actually set/clear them.
Fixes: 586d1492f301 ("f2fs: skip scanning free nid bitmap of full NAT
blocks")
Signed-off-by: Fan li <fanofcode.li@samsung.com>
---
fs/f2fs/node.c | 17 ++++++++++-------
1 file changed, 10 insertions(+), 7 deletions(-)
diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c index d234c6e..b965a53 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,
--
2.7.4
next parent reply other threads:[~2017-11-11 8:26 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20171111082604epcas5p472a0e6a07db371cb050eb6a13d8f0676@epcas5p4.samsung.com>
2017-11-11 8:25 ` LiFan [this message]
2017-11-14 4:54 ` [f2fs-dev] [PATCH RESEND] f2fs: validate before set/clear free nat bitmap Jaegeuk Kim
[not found] ` <000501d35d0d$e5d313d0$b1793b70$@samsung.com>
2017-11-14 6:27 ` 答复: " Chao Yu
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