ext4: do not interpret high bytes if 64bit feature is disabled

Fields s_free_blocks_count_hi, s_r_blocks_count_hi and s_blocks_count_hi
are not valid if EXT4_FEATURE_INCOMPAT_64BIT is not enabled and should be
treated as zeroes.

Signed-off-by: Petr Malat <oss@malat.biz>
Link: https://lore.kernel.org/r/20200825150016.3363-1-oss@malat.biz
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 523e00d..eafb92f 100644 (file)
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -3012,22 +3012,24 @@ static inline int ext4_has_group_desc_csum(struct super_block *sb)
        return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb);
 }
 
+#define ext4_read_incompat_64bit_val(es, name) \
+       (((es)->s_feature_incompat & cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT) \
+               ? (ext4_fsblk_t)le32_to_cpu(es->name##_hi) << 32 : 0) | \
+               le32_to_cpu(es->name##_lo))
+
 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
 {
-       return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
-               le32_to_cpu(es->s_blocks_count_lo);
+       return ext4_read_incompat_64bit_val(es, s_blocks_count);
 }
 
 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
 {
-       return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
-               le32_to_cpu(es->s_r_blocks_count_lo);
+       return ext4_read_incompat_64bit_val(es, s_r_blocks_count);
 }
 
 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
 {
-       return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
-               le32_to_cpu(es->s_free_blocks_count_lo);
+       return ext4_read_incompat_64bit_val(es, s_free_blocks_count);
 }
 
 static inline void ext4_blocks_count_set(struct ext4_super_block *es,