ext3: Adjust trim start with first_data_block.

As we have make the consense in the e-mail[1], the trim start should
be added with first_data_block. So this patch fulfill it and remove
the check for start < first_data_block.

[1] http://www.spinics.net/lists/linux-ext4/msg22737.html

Cc: Jan Kara <jack@suse.cz>
Cc: Lukas Czerner <lczerner@redhat.com>
Signed-off-by: Tao Ma <boyu.mt@taobao.com>
Signed-off-by: Jan Kara <jack@suse.cz>

1 files changed, 2 insertions, 5 deletions

diff --git a/fs/ext3/balloc.c b/fs/ext3/balloc.c
index 045995c8ce5a..5b8344fab79d 100644
--- a/fs/ext3/balloc.c
+++ b/fs/ext3/balloc.c
@@ -2090,7 +2090,8 @@ int ext3_trim_fs(struct super_block *sb, struct fstrim_range *range)
         ext3_fsblk_t max_blks = le32_to_cpu(es->s_blocks_count);
         int ret = 0;
 
-        start = range->start >> sb->s_blocksize_bits;
+        start = (range->start >> sb->s_blocksize_bits) +
+                le32_to_cpu(es->s_first_data_block);
         len = range->len >> sb->s_blocksize_bits;
         minlen = range->minlen >> sb->s_blocksize_bits;
         trimmed = 0;
@@ -2099,10 +2100,6 @@ int ext3_trim_fs(struct super_block *sb, struct fstrim_range *range)
                 return -EINVAL;
         if (start >= max_blks)
                 goto out;
-        if (start < le32_to_cpu(es->s_first_data_block)) {
-                len -= le32_to_cpu(es->s_first_data_block) - start;
-                start = le32_to_cpu(es->s_first_data_block);
-        }
         if (start + len > max_blks)
                 len = max_blks - start;