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btrfs: tree_search: eliminate redundant nr_items check 

If the amount of items reached the given limit of nr_items, we can leave
copy_to_sk without updating the key. Also by returning 1 we leave the loop in
search_ioctl without rechecking if we reached the given limit.

Signed-off-by: Gerhard Heift <Gerhard@Heift.Name>
Signed-off-by: Chris Mason <clm@fb.com>
Acked-by: David Sterba <dsterba@suse.cz>
This commit is contained in:
Gerhard Heift 2014-01-30 16:23:57 +01:00 committed by Chris Mason
parent c7548af69d
commit 25c9bc2e2b
1 changed files with 7 additions and 5 deletions
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12
fs/btrfs/ioctl.c
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@ -1995,7 +1995,7 @@ static noinline int copy_to_sk(struct btrfs_root *root,
if (sizeof(sh) + item_len + *sk_offset > if (sizeof(sh) + item_len + *sk_offset >
BTRFS_SEARCH_ARGS_BUFSIZE) { BTRFS_SEARCH_ARGS_BUFSIZE) {
ret = 1; ret = 1;
goto overflow; goto out;
} }
sh.objectid = key->objectid; sh.objectid = key->objectid;
@ -2017,8 +2017,10 @@ static noinline int copy_to_sk(struct btrfs_root *root,
} }
(*num_found)++; (*num_found)++;
if (*num_found >= sk->nr_items) if (*num_found >= sk->nr_items) {
break; ret = 1;
goto out;
}
} }
advance_key: advance_key:
ret = 0; ret = 0;
@ -2033,7 +2035,7 @@ advance_key:
key->objectid++; key->objectid++;
} else } else
ret = 1; ret = 1;
overflow: out:
return ret; return ret;
} }
@ -2085,7 +2087,7 @@ static noinline int search_ioctl(struct inode *inode,
ret = copy_to_sk(root, path, &key, sk, args->buf, ret = copy_to_sk(root, path, &key, sk, args->buf,
&sk_offset, &num_found); &sk_offset, &num_found);
btrfs_release_path(path); btrfs_release_path(path);
if (ret || num_found >= sk->nr_items) if (ret)
break; break;
} }