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resize.f2fs: fix wrong ovp calculation

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commit f056fbeff0
category: bugfix
issue: #I6VAS0
CVE: NA

Signed-off-by: DongSenhao <dongsenhao2@huawei.com>
---------------------------------------

beroal reported a mount failure due to broken valid_user_blocks.
[ 6890.647749] F2FS-fs (loop0): Wrong valid_user_blocks: 16040048,
user_block_count: 10016768

From fsck,

segment_count_main                      [0x    9a95 : 39573]
-> 39573 * 2MB = 78GB as user space

overprov_segment_count                  [0x    4e29 : 20009]
-> 20009 * 2MB = 40GB as overprovisioned space which user can't see.

But,
[FSCK] valid_block_count matching with CP             [Ok..] [0xf4c070]
-> 0xf4c070 = 16040048

valid_block_count                       [0x  f4c070 : 16040048]
-> So, this is correct.

It turns out resize.f2fs gave very large and wrong overprovisioning space
result in shortage of user blocks. The root cause was f2fs_get_usable_segments()
didn't consider resize case which needs segment_count_main from new superblock.

Fixes: f8410857b7 ("f2fs-tools: zns zone-capacity support")
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: dongsenhao <dongsenhao2@huawei.com>
This commit is contained in:
Jaegeuk Kim 2021-04-01 20:13:55 -07:00 committed by dongsenhao
parent ea01d23fa6
commit 7774d00ba2
1 changed files with 3 additions and 0 deletions
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3
lib/libf2fs_zoned.c
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@ -497,6 +497,9 @@ uint32_t f2fs_get_usable_segments(struct f2fs_super_block *sb)
int i, j;
uint32_t usable_segs = 0, zone_segs;
if (c.func == RESIZE)
return get_sb(segment_count_main);
for (i = 0; i < c.ndevs; i++) {
if (c.devices[i].zoned_model != F2FS_ZONED_HM) {
usable_segs += c.devices[i].total_segments;