ext4: revert buggy trim overflow patch

This reverts commit 4f531501e44: ext4: fix possible overflow in
ext4_trim_fs()

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index cd5214f..cc1297e 100644 (file)
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -4804,7 +4804,6 @@ ext4_grpblk_t ext4_trim_all_free(struct super_block *sb, struct ext4_buddy *e4b,
 int ext4_trim_fs(struct super_block *sb, struct fstrim_range *range)
 {
        struct ext4_buddy e4b;
-       ext4_fsblk_t blocks_count = ext4_blocks_count(EXT4_SB(sb)->s_es);
        ext4_group_t first_group, last_group;
        ext4_group_t group, ngroups = ext4_get_groups_count(sb);
        ext4_grpblk_t cnt = 0, first_block, last_block;
@@ -4816,11 +4815,6 @@ int ext4_trim_fs(struct super_block *sb, struct fstrim_range *range)
        minlen = range->minlen >> sb->s_blocksize_bits;
        trimmed = 0;
 
-       if (start >= blocks_count)
-               return -EINVAL;
-       if (start + len > blocks_count)
-               len = blocks_count - start;
-
        if (unlikely(minlen > EXT4_BLOCKS_PER_GROUP(sb)))
                return -EINVAL;