From db0bb7baa1533db156d8af3ebeda1f0473a0197a Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Thu, 6 Mar 2008 13:44:35 +1100 Subject: [PATCH] [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: Christoph Hellwig Signed-off-by: Lachlan McIlroy --- fs/xfs/linux-2.6/xfs_iops.c | 67 ++++++++++++++++++++------------------------- 1 file changed, 30 insertions(+), 37 deletions(-) diff --git a/fs/xfs/linux-2.6/xfs_iops.c b/fs/xfs/linux-2.6/xfs_iops.c index cc4abd3..3467011 100644 --- a/fs/xfs/linux-2.6/xfs_iops.c +++ b/fs/xfs/linux-2.6/xfs_iops.c @@ -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)) { - error = xfs_init_security(vp, dir); - if (error) - xfs_cleanup_inode(dir, vp, dentry, mode); - } + if (unlikely(error)) + goto out_free_acl; - if (unlikely(default_acl)) { - if (!error) { - error = _ACL_INHERIT(vp, mode, default_acl); - if (!error) - xfs_iflags_set(XFS_I(vp), XFS_IMODIFIED); - else - xfs_cleanup_inode(dir, vp, dentry, mode); - } + error = xfs_init_security(vp, dir); + if (unlikely(error)) + goto out_cleanup_inode; + + if (default_acl) { + error = _ACL_INHERIT(vp, mode, default_acl); + if (unlikely(error)) + goto out_cleanup_inode; + xfs_iflags_set(XFS_I(vp), XFS_IMODIFIED); _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(dir); - } + if (S_ISDIR(mode)) + 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; } -- 2.7.4