[PATCH 24/27] afs: Fix afs_statfs() to not let the values go below zero

David Howells
2020-05-29T22:03:13Z

Fix afs_statfs() so that the value for f_bavail and f_bfree don't go
"negative" if the number of blocks in use by a volume exceeds the max quota
for that volume.

Signed-off-by: David Howells <dhowells@redhat.com>
---

fs/afs/super.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/fs/afs/super.c b/fs/afs/super.c
index c77b11b31233..b552357b1d13 100644
--- a/fs/afs/super.c
+++ b/fs/afs/super.c
@@ -729,7 +729,10 @@ static void afs_get_volume_status_success(struct afs_operation *op)
buf->f_blocks = vs->part_max_blocks;
else
buf->f_blocks = vs->max_quota;
- buf->f_bavail = buf->f_bfree = buf->f_blocks - vs->blocks_in_use;
+
+ if (buf->f_blocks > vs->blocks_in_use)
+ buf->f_bavail = buf->f_bfree =
+ buf->f_blocks - vs->blocks_in_use;
}

static const struct afs_operation_ops afs_get_volume_status_operation = {