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-rw-r--r--fs/ext4/super.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 874dd25..266174b 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -4458,6 +4458,7 @@ static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
struct ext4_sb_info *sbi = EXT4_SB(sb);
struct ext4_super_block *es = sbi->s_es;
u64 fsid;
+ s64 bfree;
if (test_opt(sb, MINIX_DF)) {
sbi->s_overhead_last = 0;
@@ -4501,8 +4502,10 @@ static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
buf->f_type = EXT4_SUPER_MAGIC;
buf->f_bsize = sb->s_blocksize;
buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last;
- buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter) -
+ bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter) -
percpu_counter_sum_positive(&sbi->s_dirtyblocks_counter);
+ /* prevent underflow in case that few free space is available */
+ buf->f_bfree = max_t(s64, bfree, 0);
buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
if (buf->f_bfree < ext4_r_blocks_count(es))
buf->f_bavail = 0;
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