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authorGerhard Heift <gerhard@heift.name>2014-01-30 16:23:57 +0100
committerChris Mason <clm@fb.com>2014-06-13 03:20:39 +0200
commit25c9bc2e2bc9d67de7fc49ff2784cae5de755192 (patch)
treefe51f95796bd4e6126c70bcc48e01ed08add3f57 /fs/btrfs
parentBtrfs: convert smp_mb__{before,after}_clear_bit (diff)
downloadlinux-25c9bc2e2bc9d67de7fc49ff2784cae5de755192.tar.xz
linux-25c9bc2e2bc9d67de7fc49ff2784cae5de755192.zip
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>
Diffstat (limited to 'fs/btrfs')
-rw-r--r--fs/btrfs/ioctl.c12
1 files changed, 7 insertions, 5 deletions
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index c2e796b664c1..65148cd102cd 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -1995,7 +1995,7 @@ static noinline int copy_to_sk(struct btrfs_root *root,
if (sizeof(sh) + item_len + *sk_offset >
BTRFS_SEARCH_ARGS_BUFSIZE) {
ret = 1;
- goto overflow;
+ goto out;
}
sh.objectid = key->objectid;
@@ -2017,8 +2017,10 @@ static noinline int copy_to_sk(struct btrfs_root *root,
}
(*num_found)++;
- if (*num_found >= sk->nr_items)
- break;
+ if (*num_found >= sk->nr_items) {
+ ret = 1;
+ goto out;
+ }
}
advance_key:
ret = 0;
@@ -2033,7 +2035,7 @@ advance_key:
key->objectid++;
} else
ret = 1;
-overflow:
+out:
return ret;
}
@@ -2085,7 +2087,7 @@ static noinline int search_ioctl(struct inode *inode,
ret = copy_to_sk(root, path, &key, sk, args->buf,
&sk_offset, &num_found);
btrfs_release_path(path);
- if (ret || num_found >= sk->nr_items)
+ if (ret)
break;
}