[PATCH 6.6 17/21] xfs: make sure sb_fdblocks is non-negative

Catherine Hoang
2024-10-16T00:12:34Z

From: Wengang Wang <wen.gang.wang@oracle.com>

commit 58f880711f2ba53fd5e959875aff5b3bf6d5c32e upstream.

A user with a completely full filesystem experienced an unexpected
shutdown when the filesystem tried to write the superblock during
runtime.
kernel shows the following dmesg:

[ 8.176281] XFS (dm-4): Metadata corruption detected at xfs_sb_write_verify+0x60/0x120 [xfs], xfs_sb block 0x0
[ 8.177417] XFS (dm-4): Unmount and run xfs_repair
[ 8.178016] XFS (dm-4): First 128 bytes of corrupted metadata buffer:
[ 8.178703] 00000000: 58 46 53 42 00 00 10 00 00 00 00 00 01 90 00 00 XFSB............
[ 8.179487] 00000010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
[ 8.180312] 00000020: cf 12 dc 89 ca 26 45 29 92 e6 e3 8d 3b b8 a2 c3 .....&E)....;...
[ 8.181150] 00000030: 00 00 00 00 01 00 00 06 00 00 00 00 00 00 00 80 ................
[ 8.182003] 00000040: 00 00 00 00 00 00 00 81 00 00 00 00 00 00 00 82 ................
[ 8.182004] 00000050: 00 00 00 01 00 64 00 00 00 00 00 04 00 00 00 00 .....d..........
[ 8.182004] 00000060: 00 00 64 00 b4 a5 02 00 02 00 00 08 00 00 00 00 ..d.............
[ 8.182005] 00000070: 00 00 00 00 00 00 00 00 0c 09 09 03 17 00 00 19 ................
[ 8.182008] XFS (dm-4): Corruption of in-memory data detected. Shutting down filesystem
[ 8.182010] XFS (dm-4): Please unmount the filesystem and rectify the problem(s)

When xfs_log_sb writes super block to disk, b_fdblocks is fetched from
m_fdblocks without any lock. As m_fdblocks can experience a positive ->
negative -> positive changing when the FS reaches fullness (see
xfs_mod_fdblocks). So there is a chance that sb_fdblocks is negative, and
because sb_fdblocks is type of unsigned long long, it reads super big.
And sb_fdblocks being bigger than sb_dblocks is a problem during log
recovery, xfs_validate_sb_write() complains.

Fix:
As sb_fdblocks will be re-calculated during mount when lazysbcount is
enabled, We just need to make xfs_validate_sb_write() happy -- make sure
sb_fdblocks is not nenative. This patch also takes care of other percpu
counters in xfs_log_sb.

Signed-off-by: Wengang Wang <wen.gang.wang@oracle.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Chandan Babu R <chandanbabu@kernel.org>
Signed-off-by: Catherine Hoang <catherine.hoang@oracle.com>
Acked-by: Darrick J. Wong <djwong@kernel.org>
---
fs/xfs/libxfs/xfs_sb.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/fs/xfs/libxfs/xfs_sb.c b/fs/xfs/libxfs/xfs_sb.c
index 59c4804e4d79..424acdd4b0fc 100644
--- a/fs/xfs/libxfs/xfs_sb.c
+++ b/fs/xfs/libxfs/xfs_sb.c
@@ -1031,11 +1031,12 @@ xfs_log_sb(
* and hence we don't need have to update it here.
*/
if (xfs_has_lazysbcount(mp)) {
- mp->m_sb.sb_icount = percpu_counter_sum(&mp->m_icount);
+ mp->m_sb.sb_icount = percpu_counter_sum_positive(&mp->m_icount);
mp->m_sb.sb_ifree = min_t(uint64_t,
- percpu_counter_sum(&mp->m_ifree),
+ percpu_counter_sum_positive(&mp->m_ifree),
mp->m_sb.sb_icount);
- mp->m_sb.sb_fdblocks = percpu_counter_sum(&mp->m_fdblocks);
+ mp->m_sb.sb_fdblocks =
+ percpu_counter_sum_positive(&mp->m_fdblocks);
}

xfs_sb_to_disk(bp->b_addr, &mp->m_sb);
--
2.39.3