[RFC PATCH 1/4] pass open file to ->setattr()

[miklos]

From: Miklos Szeredi <mszeredi@xxxxxxx>

Pass the open file into the filesystem's ->setattr() method for
fchmod, fchown and some of the utimes variants.

This is needed to be able to correctly implement open-unlink-fsetattr
semantics in some filesystem such as sshfs, without having to resort
to "silly-renaming".

The infrastructure is already there, so just need to fill in
attrs.ia_file and set ATTR_FILE in attrs.ia_valid.

Signed-off-by: Miklos Szeredi <mszeredi@xxxxxxx>
---

Index: linux/fs/open.c
===================================================================
--- linux.orig/fs/open.c	2007-08-09 16:47:30.000000000 +0200
+++ linux/fs/open.c	2007-08-09 16:48:43.000000000 +0200
@@ -581,7 +581,8 @@ asmlinkage long sys_fchmod(unsigned int 
 	if (mode == (mode_t) -1)
 		mode = inode->i_mode;
 	newattrs.ia_mode = (mode & S_IALLUGO) | (inode->i_mode & ~S_IALLUGO);
-	newattrs.ia_valid = ATTR_MODE | ATTR_CTIME;
+	newattrs.ia_valid = ATTR_MODE | ATTR_CTIME | ATTR_FILE;
+	newattrs.ia_file = file;
 	err = notify_change(dentry, &newattrs);
 	mutex_unlock(&inode->i_mutex);
 
@@ -631,7 +632,8 @@ asmlinkage long sys_chmod(const char __u
 	return sys_fchmodat(AT_FDCWD, filename, mode);
 }
 
-static int chown_common(struct dentry * dentry, uid_t user, gid_t group)
+static int chown_common(struct dentry * dentry, uid_t user, gid_t group,
+			struct file *file)
 {
 	struct inode * inode;
 	int error;
@@ -659,6 +661,10 @@ static int chown_common(struct dentry * 
 	}
 	if (!S_ISDIR(inode->i_mode))
 		newattrs.ia_valid |= ATTR_KILL_SUID|ATTR_KILL_SGID;
+	if (file) {
+		newattrs.ia_file = file;
+		newattrs.ia_valid |= ATTR_FILE;
+	}
 	mutex_lock(&inode->i_mutex);
 	error = notify_change(dentry, &newattrs);
 	mutex_unlock(&inode->i_mutex);
@@ -674,7 +680,7 @@ asmlinkage long sys_chown(const char __u
 	error = user_path_walk(filename, &nd);
 	if (error)
 		goto out;
-	error = chown_common(nd.dentry, user, group);
+	error = chown_common(nd.dentry, user, group, NULL);
 	path_release(&nd);
 out:
 	return error;
@@ -694,7 +700,7 @@ asmlinkage long sys_fchownat(int dfd, co
 	error = __user_walk_fd(dfd, filename, follow, &nd);
 	if (error)
 		goto out;
-	error = chown_common(nd.dentry, user, group);
+	error = chown_common(nd.dentry, user, group, NULL);
 	path_release(&nd);
 out:
 	return error;
@@ -708,7 +714,7 @@ asmlinkage long sys_lchown(const char __
 	error = user_path_walk_link(filename, &nd);
 	if (error)
 		goto out;
-	error = chown_common(nd.dentry, user, group);
+	error = chown_common(nd.dentry, user, group, NULL);
 	path_release(&nd);
 out:
 	return error;
@@ -727,7 +733,7 @@ asmlinkage long sys_fchown(unsigned int 
 
 	dentry = file->f_path.dentry;
 	audit_inode(NULL, dentry);
-	error = chown_common(dentry, user, group);
+	error = chown_common(dentry, user, group, file);
 	fput(file);
 out:
 	return error;
Index: linux/fs/utimes.c
===================================================================
--- linux.orig/fs/utimes.c	2007-08-09 16:47:30.000000000 +0200
+++ linux/fs/utimes.c	2007-08-09 16:48:43.000000000 +0200
@@ -130,6 +130,10 @@ long do_utimes(int dfd, char __user *fil
 			}
 		}
 	}
+	if (f) {
+		newattrs.ia_file = f;
+		newattrs.ia_valid |= ATTR_FILE;
+	}
 	mutex_lock(&inode->i_mutex);
 	error = notify_change(dentry, &newattrs);
 	mutex_unlock(&inode->i_mutex);

--
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