[PATCH] r/o bind mounts: prepare for write access checks: collapse if()

[linux-2.6-omap-h63xx.git] / fs / open.c

diff --git a/fs/open.c b/fs/open.c
index 35c3e454458ea4e434db071fcd380eda574ce919..89e0c237a636987d5b131e5816e8d9d9f238f210 100644 (file)
--- a/fs/open.c
+++ b/fs/open.c
@@ -386,15 +386,21 @@ asmlinkage long sys_faccessat(int dfd, const char __user *filename, int mode)
                current->cap_effective = current->cap_permitted;
 
        res = __user_walk_fd(dfd, filename, LOOKUP_FOLLOW|LOOKUP_ACCESS, &nd);
-       if (!res) {
-               res = vfs_permission(&nd, mode);
-               /* SuS v2 requires we report a read only fs too */
-               if(!res && (mode & S_IWOTH) && IS_RDONLY(nd.dentry->d_inode)
-                  && !special_file(nd.dentry->d_inode->i_mode))
-                       res = -EROFS;
-               path_release(&nd);
-       }
+       if (res)
+               goto out;
+
+       res = vfs_permission(&nd, mode);
+       /* SuS v2 requires we report a read only fs too */
+       if(res || !(mode & S_IWOTH) ||
+          special_file(nd.dentry->d_inode->i_mode))
+               goto out_path_release;
+
+       if(IS_RDONLY(nd.dentry->d_inode))
+               res = -EROFS;
 
+out_path_release:
+       path_release(&nd);
+out:
        current->fsuid = old_fsuid;
        current->fsgid = old_fsgid;
        current->cap_effective = old_cap;
@@ -603,10 +609,11 @@ asmlinkage long sys_chown(const char __user * filename, uid_t user, gid_t group)
        int error;
 
        error = user_path_walk(filename, &nd);
-       if (!error) {
-               error = chown_common(nd.dentry, user, group);
-               path_release(&nd);
-       }
+       if (error)
+               goto out;
+       error = chown_common(nd.dentry, user, group);
+       path_release(&nd);
+out:
        return error;
 }
 
@@ -622,10 +629,10 @@ asmlinkage long sys_fchownat(int dfd, const char __user *filename, uid_t user,
 
        follow = (flag & AT_SYMLINK_NOFOLLOW) ? 0 : LOOKUP_FOLLOW;
        error = __user_walk_fd(dfd, filename, follow, &nd);
-       if (!error) {
-               error = chown_common(nd.dentry, user, group);
-               path_release(&nd);
-       }
+       if (error)
+               goto out;
+       error = chown_common(nd.dentry, user, group);
+       path_release(&nd);
 out:
        return error;
 }
@@ -636,10 +643,11 @@ asmlinkage long sys_lchown(const char __user * filename, uid_t user, gid_t group
        int error;
 
        error = user_path_walk_link(filename, &nd);
-       if (!error) {
-               error = chown_common(nd.dentry, user, group);
-               path_release(&nd);
-       }
+       if (error)
+               goto out;
+       error = chown_common(nd.dentry, user, group);
+       path_release(&nd);
+out:
        return error;
 }
 
@@ -648,15 +656,17 @@ asmlinkage long sys_fchown(unsigned int fd, uid_t user, gid_t group)
 {
        struct file * file;
        int error = -EBADF;
+       struct dentry * dentry;
 
        file = fget(fd);
-       if (file) {
-               struct dentry * dentry;
-               dentry = file->f_dentry;
-               audit_inode(NULL, dentry->d_inode);
-               error = chown_common(dentry, user, group);
-               fput(file);
-       }
+       if (!file)
+               goto out;
+
+       dentry = file->f_dentry;
+       audit_inode(NULL, dentry->d_inode);
+       error = chown_common(dentry, user, group);
+       fput(file);
+out:
        return error;
 }