diff options
| -rw-r--r-- | fs/ext4/super.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/fs/ext4/super.c b/fs/ext4/super.c index 874dd25b7481..266174b268cc 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; |