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Commit db0bb7ba authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Lachlan McIlroy
Browse files

[XFS] cleanup xfs_vn_mknod 



- use proper goto based unwinding instead of the current mess of
  multiple conditionals
- rename ip to inode because that's the normal convention for Linux
  inodes while ip is the convention for xfs_inodes
- remove unlikely checks for the default_acl - branches marked unlikely
  might lead to extreme branch bredictor slowdons if taken and for some
  workloads a default acl is quite common
- properly indent the switch statements
- remove xfs_has_fs_struct as nfsd has a fs_struct in any semi-recent
  kernel

SGI-PV: 976035
SGI-Modid: xfs-linux-melb:xfs-kern:30529a

Signed-off-by: default avatarChristoph Hellwig <hch@infradead.org>
Signed-off-by: default avatarLachlan McIlroy <lachlan@sgi.com>
parent 155cc6b7

fs/xfs/linux-2.6/xfs_iops.c

+30 −37
Original line number Diff line number Diff line
@@ -241,18 +241,6 @@ xfs_init_security( 
	return error;

}



/*

 * Determine whether a process has a valid fs_struct (kernel daemons

 * like knfsd don't have an fs_struct).

 *

 * XXX(hch):  nfsd is broken, better fix it instead.

 */

STATIC_INLINE int

xfs_has_fs_struct(struct task_struct *task)

{

	return (task->fs != init_task.fs);

}



STATIC void

xfs_cleanup_inode(

	struct inode	*dir,
@@ -284,7 +272,7 @@ xfs_vn_mknod( 
	int		mode,

	dev_t		rdev)

{

	struct inode	*ip;

	struct inode	*inode;

	bhv_vnode_t	*vp = NULL, *dvp = vn_from_inode(dir);

	xfs_acl_t	*default_acl = NULL;

	attrexists_t	test_default_acl = _ACL_DEFAULT_EXISTS;
@@ -297,7 +285,7 @@ xfs_vn_mknod( 
	if (unlikely(!sysv_valid_dev(rdev) || MAJOR(rdev) & ~0x1ff))

		return -EINVAL;



	if (unlikely(test_default_acl && test_default_acl(dvp))) {

	if (test_default_acl && test_default_acl(dvp)) {

		if (!_ACL_ALLOC(default_acl)) {

			return -ENOMEM;

		}
@@ -307,11 +295,14 @@ xfs_vn_mknod( 
		}

	}



	if (IS_POSIXACL(dir) && !default_acl && xfs_has_fs_struct(current))

	if (IS_POSIXACL(dir) && !default_acl)

		mode &= ~current->fs->umask;



	switch (mode & S_IFMT) {

	case S_IFCHR: case S_IFBLK: case S_IFIFO: case S_IFSOCK:

	case S_IFCHR:

	case S_IFBLK:

	case S_IFIFO:

	case S_IFSOCK:

		rdev = sysv_encode_dev(rdev);

	case S_IFREG:

		error = xfs_create(XFS_I(dir), dentry, mode, rdev, &vp, NULL);
@@ -324,32 +315,34 @@ xfs_vn_mknod( 
		break;

	}



	if (unlikely(!error)) {

	if (unlikely(error))

		goto out_free_acl;



	error = xfs_init_security(vp, dir);

		if (error)

			xfs_cleanup_inode(dir, vp, dentry, mode);

	}

	if (unlikely(error))

		goto out_cleanup_inode;



	if (unlikely(default_acl)) {

		if (!error) {

	if (default_acl) {

		error = _ACL_INHERIT(vp, mode, default_acl);

			if (!error)

		if (unlikely(error))

			goto out_cleanup_inode;

		xfs_iflags_set(XFS_I(vp), XFS_IMODIFIED);

			else

				xfs_cleanup_inode(dir, vp, dentry, mode);

		}

		_ACL_FREE(default_acl);

	}



	if (likely(!error)) {

		ASSERT(vp);

		ip = vn_to_inode(vp);

	inode = vn_to_inode(vp);



	if (S_ISDIR(mode))

			xfs_validate_fields(ip);

		d_instantiate(dentry, ip);

		xfs_validate_fields(inode);

	d_instantiate(dentry, inode);

	xfs_validate_fields(dir);

	}

	return -error;



 out_cleanup_inode:

	xfs_cleanup_inode(dir, vp, dentry, mode);

 out_free_acl:

	if (default_acl)

		_ACL_FREE(default_acl);

	return -error;

}