ext4: Checksum the block bitmap properly with bigalloc enabled

In mke2fs, we only checksum the whole bitmap block and it is right.
While in the kernel, we use EXT4_BLOCKS_PER_GROUP to indicate the
size of the checksumed bitmap which is wrong when we enable bigalloc.
The right size should be EXT4_CLUSTERS_PER_GROUP and this patch fixes
it.

Also as every caller of ext4_block_bitmap_csum_set and
ext4_block_bitmap_csum_verify pass in EXT4_BLOCKS_PER_GROUP(sb)/8,
we'd better removes this parameter and sets it in the function itself.

Signed-off-by: Tao Ma <boyu.mt@taobao.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Reviewed-by: Lukas Czerner <lczerner@redhat.com>
Cc: stable@vger.kernel.org

diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c
index 1b50890..cf18217 100644 (file)
--- a/fs/ext4/balloc.c
+++ b/fs/ext4/balloc.c
@@ -174,8 +174,7 @@ void ext4_init_block_bitmap(struct super_block *sb, struct buffer_head *bh,
                ext4_free_inodes_set(sb, gdp, 0);
                ext4_itable_unused_set(sb, gdp, 0);
                memset(bh->b_data, 0xff, sb->s_blocksize);
-               ext4_block_bitmap_csum_set(sb, block_group, gdp, bh,
-                                          EXT4_BLOCKS_PER_GROUP(sb) / 8);
+               ext4_block_bitmap_csum_set(sb, block_group, gdp, bh);
                return;
        }
        memset(bh->b_data, 0, sb->s_blocksize);
@@ -212,8 +211,7 @@ void ext4_init_block_bitmap(struct super_block *sb, struct buffer_head *bh,
         */
        ext4_mark_bitmap_end(num_clusters_in_group(sb, block_group),
                             sb->s_blocksize * 8, bh->b_data);
-       ext4_block_bitmap_csum_set(sb, block_group, gdp, bh,
-                                  EXT4_BLOCKS_PER_GROUP(sb) / 8);
+       ext4_block_bitmap_csum_set(sb, block_group, gdp, bh);
        ext4_group_desc_csum_set(sb, block_group, gdp);
 }
 
@@ -350,7 +348,7 @@ void ext4_validate_block_bitmap(struct super_block *sb,
                return;
        }
        if (unlikely(!ext4_block_bitmap_csum_verify(sb, block_group,
-                       desc, bh, EXT4_BLOCKS_PER_GROUP(sb) / 8))) {
+                       desc, bh))) {
                ext4_unlock_group(sb, block_group);
                ext4_error(sb, "bg %u: bad block bitmap checksum", block_group);
                return;

diff --git a/fs/ext4/bitmap.c b/fs/ext4/bitmap.c
index 5c2d181..3285aa5 100644 (file)
--- a/fs/ext4/bitmap.c
+++ b/fs/ext4/bitmap.c
@@ -58,11 +58,12 @@ void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
 
 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
                                  struct ext4_group_desc *gdp,
-                                 struct buffer_head *bh, int sz)
+                                 struct buffer_head *bh)
 {
        __u32 hi;
        __u32 provided, calculated;
        struct ext4_sb_info *sbi = EXT4_SB(sb);
+       int sz = EXT4_CLUSTERS_PER_GROUP(sb) / 8;
 
        if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
                                        EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
@@ -84,8 +85,9 @@ int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
 
 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
                                struct ext4_group_desc *gdp,
-                               struct buffer_head *bh, int sz)
+                               struct buffer_head *bh)
 {
+       int sz = EXT4_CLUSTERS_PER_GROUP(sb) / 8;
        __u32 csum;
        struct ext4_sb_info *sbi = EXT4_SB(sb);
 

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 78971cf..3c20de1 100644 (file)
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -1882,10 +1882,10 @@ int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
                                  struct buffer_head *bh, int sz);
 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
                                struct ext4_group_desc *gdp,
-                               struct buffer_head *bh, int sz);
+                               struct buffer_head *bh);
 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
                                  struct ext4_group_desc *gdp,
-                                 struct buffer_head *bh, int sz);
+                                 struct buffer_head *bh);
 
 /* balloc.c */
 extern void ext4_validate_block_bitmap(struct super_block *sb,

diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
index fa36372..4facdd2 100644 (file)
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -762,9 +762,7 @@ got:
                        ext4_free_group_clusters_set(sb, gdp,
                                ext4_free_clusters_after_init(sb, group, gdp));
                        ext4_block_bitmap_csum_set(sb, group, gdp,
-                                                  block_bitmap_bh,
-                                                  EXT4_BLOCKS_PER_GROUP(sb) /
-                                                  8);
+                                                  block_bitmap_bh);
                        ext4_group_desc_csum_set(sb, group, gdp);
                }
                ext4_unlock_group(sb, group);

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index a415465..eb1e385 100644 (file)
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -2805,8 +2805,7 @@ ext4_mb_mark_diskspace_used(struct ext4_allocation_context *ac,
        }
        len = ext4_free_group_clusters(sb, gdp) - ac->ac_b_ex.fe_len;
        ext4_free_group_clusters_set(sb, gdp, len);
-       ext4_block_bitmap_csum_set(sb, ac->ac_b_ex.fe_group, gdp, bitmap_bh,
-                                  EXT4_BLOCKS_PER_GROUP(sb) / 8);
+       ext4_block_bitmap_csum_set(sb, ac->ac_b_ex.fe_group, gdp, bitmap_bh);
        ext4_group_desc_csum_set(sb, ac->ac_b_ex.fe_group, gdp);
 
        ext4_unlock_group(sb, ac->ac_b_ex.fe_group);
@@ -4666,8 +4665,7 @@ do_more:
 
        ret = ext4_free_group_clusters(sb, gdp) + count_clusters;
        ext4_free_group_clusters_set(sb, gdp, ret);
-       ext4_block_bitmap_csum_set(sb, block_group, gdp, bitmap_bh,
-                                  EXT4_BLOCKS_PER_GROUP(sb) / 8);
+       ext4_block_bitmap_csum_set(sb, block_group, gdp, bitmap_bh);
        ext4_group_desc_csum_set(sb, block_group, gdp);
        ext4_unlock_group(sb, block_group);
        percpu_counter_add(&sbi->s_freeclusters_counter, count_clusters);
@@ -4811,8 +4809,7 @@ int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
        mb_free_blocks(NULL, &e4b, bit, count);
        blk_free_count = blocks_freed + ext4_free_group_clusters(sb, desc);
        ext4_free_group_clusters_set(sb, desc, blk_free_count);
-       ext4_block_bitmap_csum_set(sb, block_group, desc, bitmap_bh,
-                                  EXT4_BLOCKS_PER_GROUP(sb) / 8);
+       ext4_block_bitmap_csum_set(sb, block_group, desc, bitmap_bh);
        ext4_group_desc_csum_set(sb, block_group, desc);
        ext4_unlock_group(sb, block_group);
        percpu_counter_add(&sbi->s_freeclusters_counter,

diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c
index 7a75e10..47bf06a 100644 (file)
--- a/fs/ext4/resize.c
+++ b/fs/ext4/resize.c
@@ -1212,8 +1212,7 @@ static int ext4_set_bitmap_checksums(struct super_block *sb,
        bh = ext4_get_bitmap(sb, group_data->block_bitmap);
        if (!bh)
                return -EIO;
-       ext4_block_bitmap_csum_set(sb, group, gdp, bh,
-                                  EXT4_BLOCKS_PER_GROUP(sb) / 8);
+       ext4_block_bitmap_csum_set(sb, group, gdp, bh);
        brelse(bh);
 
        return 0;