ext4: don't update checksum of new initialized bitmaps

When reading the inode or block allocation bitmap, if the bitmap needs
to be initialized, do not update the checksum in the block group
descriptor.  That's because we're not set up to journal those changes.
Instead, just set the verified bit on the bitmap block, so that it's
not necessary to validate the checksum.

When a block or inode allocation actually happens, at that point the
checksum will be calculated, and update of the bg descriptor block
will be properly journalled.

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@vger.kernel.org

diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c
index f9b3e0a83526a333241e8b5410103b999aae1e23..f82c4966f4ce78bd916841fede0d009d4cf84d28 100644 (file)
--- a/fs/ext4/balloc.c
+++ b/fs/ext4/balloc.c
@@ -243,8 +243,6 @@ static int ext4_init_block_bitmap(struct super_block *sb,
         */
        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_group_desc_csum_set(sb, block_group, gdp);
        return 0;
 }
 
@@ -448,6 +446,7 @@ ext4_read_block_bitmap_nowait(struct super_block *sb, ext4_group_t block_group)
                err = ext4_init_block_bitmap(sb, bh, block_group, desc);
                set_bitmap_uptodate(bh);
                set_buffer_uptodate(bh);
+               set_buffer_verified(bh);
                ext4_unlock_group(sb, block_group);
                unlock_buffer(bh);
                if (err) {

diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
index 7830d28df331d8eb69374851ba59163c36f0eaa7..3fa93665b4a33902b39f0da1e3983e3658cbe4d0 100644 (file)
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -66,44 +66,6 @@ void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap)
                memset(bitmap + (i >> 3), 0xff, (end_bit - i) >> 3);
 }
 
-/* Initializes an uninitialized inode bitmap */
-static int ext4_init_inode_bitmap(struct super_block *sb,
-                                      struct buffer_head *bh,
-                                      ext4_group_t block_group,
-                                      struct ext4_group_desc *gdp)
-{
-       struct ext4_group_info *grp;
-       struct ext4_sb_info *sbi = EXT4_SB(sb);
-       J_ASSERT_BH(bh, buffer_locked(bh));
-
-       /* If checksum is bad mark all blocks and inodes use to prevent
-        * allocation, essentially implementing a per-group read-only flag. */
-       if (!ext4_group_desc_csum_verify(sb, block_group, gdp)) {
-               grp = ext4_get_group_info(sb, block_group);
-               if (!EXT4_MB_GRP_BBITMAP_CORRUPT(grp))
-                       percpu_counter_sub(&sbi->s_freeclusters_counter,
-                                          grp->bb_free);
-               set_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &grp->bb_state);
-               if (!EXT4_MB_GRP_IBITMAP_CORRUPT(grp)) {
-                       int count;
-                       count = ext4_free_inodes_count(sb, gdp);
-                       percpu_counter_sub(&sbi->s_freeinodes_counter,
-                                          count);
-               }
-               set_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &grp->bb_state);
-               return -EFSBADCRC;
-       }
-
-       memset(bh->b_data, 0, (EXT4_INODES_PER_GROUP(sb) + 7) / 8);
-       ext4_mark_bitmap_end(EXT4_INODES_PER_GROUP(sb), sb->s_blocksize * 8,
-                       bh->b_data);
-       ext4_inode_bitmap_csum_set(sb, block_group, gdp, bh,
-                                  EXT4_INODES_PER_GROUP(sb) / 8);
-       ext4_group_desc_csum_set(sb, block_group, gdp);
-
-       return 0;
-}
-
 void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate)
 {
        if (uptodate) {
@@ -187,17 +149,14 @@ ext4_read_inode_bitmap(struct super_block *sb, ext4_group_t block_group)
 
        ext4_lock_group(sb, block_group);
        if (desc->bg_flags & cpu_to_le16(EXT4_BG_INODE_UNINIT)) {
-               err = ext4_init_inode_bitmap(sb, bh, block_group, desc);
+               memset(bh->b_data, 0, (EXT4_INODES_PER_GROUP(sb) + 7) / 8);
+               ext4_mark_bitmap_end(EXT4_INODES_PER_GROUP(sb),
+                                    sb->s_blocksize * 8, bh->b_data);
                set_bitmap_uptodate(bh);
                set_buffer_uptodate(bh);
                set_buffer_verified(bh);
                ext4_unlock_group(sb, block_group);
                unlock_buffer(bh);
-               if (err) {
-                       ext4_error(sb, "Failed to init inode bitmap for group "
-                                  "%u: %d", block_group, err);
-                       goto out;
-               }
                return bh;
        }
        ext4_unlock_group(sb, block_group);