btrfs: Ensure the tree search ioctl returns the right number of records

Btrfs's tree search ioctl has a field to indicate that no more than a
given number of records should be returned. The ioctl doesn't honour
this, as the tested value is not incremented until the end of the
copy_to_sk function. This patch removes an unnecessary local variable,
and updates the num_found counter as each key is found in the tree.

Signed-off-by: Hugo Mills <hugo@carfax.org.uk>
Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 1 insertions, 3 deletions

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 2616f7ed4799..ce773fb736a1 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -1279,7 +1279,6 @@ static noinline int copy_to_sk(struct btrfs_root *root,
         int nritems;
         int i;
         int slot;
-        int found = 0;
         int ret = 0;
 
         leaf = path->nodes[0];
@@ -1326,7 +1325,7 @@ static noinline int copy_to_sk(struct btrfs_root *root,
                                            item_off, item_len);
                         *sk_offset += item_len;
                 }
-                found++;
+                (*num_found)++;
 
                 if (*num_found >= sk->nr_items)
                         break;
@@ -1345,7 +1344,6 @@ advance_key:
         } else
                 ret = 1;
 overflow:
-        *num_found += found;
         return ret;
 }