[PATCH 8/8] fs/9p: Less function calls in v9fs_vfs_mknod_dotl() after error detection

SF Markus Elfring
2014-12-28T20:50:30Z

From: Markus Elfring <elfring@users.sourceforge.net>
Date: Sun, 28 Dec 2014 13:36:28 +0100

The p9_client_clunk() function was called in four cases by the
v9fs_vfs_mknod_dotl() function during error handling even if the passed
variable "fid" contained a null pointer. The v9fs_put_acl() function could
also be unnecessarily called with null pointers.

* This implementation detail could be improved by the introduction of
two jump labels.

* Let us delete also two unnecessary variable assignments there.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
---
fs/9p/vfs_inode_dotl.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/fs/9p/vfs_inode_dotl.c b/fs/9p/vfs_inode_dotl.c
index 3b38dda..ff3c26a 100644
--- a/fs/9p/vfs_inode_dotl.c
+++ b/fs/9p/vfs_inode_dotl.c
@@ -832,8 +832,7 @@ v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
if (IS_ERR(dfid)) {
err = PTR_ERR(dfid);
p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
- dfid = NULL;
- goto error;
+ goto exit;
}

gid = v9fs_get_fsgid_for_create(dir);
@@ -843,13 +842,13 @@ v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
if (err) {
p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n",
err);
- goto error;
+ goto exit;
}
name = (char *) dentry->d_name.name;

err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
if (err < 0)
- goto error;
+ goto put_acl;

v9fs_invalidate_inode_attr(dir);
fid = p9_client_walk(dfid, 1, &name, 1);
@@ -857,8 +856,7 @@ v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
err = PTR_ERR(fid);
p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
err);
- fid = NULL;
- goto error;
+ goto put_acl;
}

/* instantiate inode and assign the unopened fid to the dentry */
@@ -890,7 +888,9 @@ v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
}
error:
p9_client_clunk(fid);
+put_acl:
v9fs_put_acl(dacl, pacl);
+exit:
return err;
}

--
2.2.1