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-rw-r--r--fs/ext4/super.c15
1 files changed, 12 insertions, 3 deletions
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 23a9b2c086ed..d08820fdfdee 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -5289,9 +5289,18 @@ no_journal:
* Get the # of file system overhead blocks from the
* superblock if present.
*/
- if (es->s_overhead_clusters)
- sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters);
- else {
+ sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters);
+ /* ignore the precalculated value if it is ridiculous */
+ if (sbi->s_overhead > ext4_blocks_count(es))
+ sbi->s_overhead = 0;
+ /*
+ * If the bigalloc feature is not enabled recalculating the
+ * overhead doesn't take long, so we might as well just redo
+ * it to make sure we are using the correct value.
+ */
+ if (!ext4_has_feature_bigalloc(sb))
+ sbi->s_overhead = 0;
+ if (sbi->s_overhead == 0) {
err = ext4_calculate_overhead(sb);
if (err)
goto failed_mount_wq;