[PATCH] move IMMUTABLE|APPEND checks to notify_change()

[Kirill Korotaev]

[PATCH] move IMMUTABLE|APPEND checks to notify_change()

This patch moves lots of IMMUTABLE and APPEND flag checks
scattered all around to more logical place in notify_change().

Signed-Off-By: Dmitry Mishin <dim@xxxxxxxxxx>
Signed-Off-By: Kirill Korotaev <dev@xxxxxxxxxx>


--- ./fs/attr.c.immut	2006-06-18 05:49:35.000000000 +0400
+++ ./fs/attr.c	2006-08-08 15:15:59.000000000 +0400
@@ -109,6 +109,9 @@ int notify_change(struct dentry * dentry
	struct timespec now;
	unsigned int ia_valid = attr->ia_valid;

+	if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
+		return -EPERM;
+
	mode = inode->i_mode;
	now = current_fs_time(inode->i_sb);

--- ./fs/open.c.immut	2006-07-14 19:08:29.000000000 +0400
+++ ./fs/open.c	2006-08-08 15:19:58.000000000 +0400
@@ -252,10 +252,6 @@ static long do_sys_truncate(const char _
	if (IS_RDONLY(inode))
		goto dput_and_out;

-	error = -EPERM;
-	if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
-		goto dput_and_out;
-
	/*
	 * Make sure that there are no leases.
	 */
@@ -316,10 +312,6 @@ static long do_sys_ftruncate(unsigned in
	if (small && length > MAX_NON_LFS)
		goto out_putf;

-	error = -EPERM;
-	if (IS_APPEND(inode))
-		goto out_putf;
-
	error = locks_verify_truncate(inode, file, length);
	if (!error)
		error = do_truncate(dentry, length, ATTR_MTIME|ATTR_CTIME, file);
@@ -385,10 +377,6 @@ asmlinkage long sys_utime(char __user * 
	/* Don't worry, the checks are done in inode_change_ok() */
	newattrs.ia_valid = ATTR_CTIME | ATTR_MTIME | ATTR_ATIME;
	if (times) {
-		error = -EPERM;
-		if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
-			goto dput_and_out;
-
		error = get_user(newattrs.ia_atime.tv_sec, &times->actime);
		newattrs.ia_atime.tv_nsec = 0;
		if (!error)
@@ -398,15 +386,9 @@ asmlinkage long sys_utime(char __user * 
			goto dput_and_out;

		newattrs.ia_valid |= ATTR_ATIME_SET | ATTR_MTIME_SET;
-	} else {
-                error = -EACCES;
-                if (IS_IMMUTABLE(inode))
-                        goto dput_and_out;
-
-		if (current->fsuid != inode->i_uid &&
+	} else if (current->fsuid != inode->i_uid &&
		    (error = vfs_permission(&nd, MAY_WRITE)) != 0)
-			goto dput_and_out;
-	}
+		goto dput_and_out;
	mutex_lock(&inode->i_mutex);
	error = notify_change(nd.dentry, &newattrs);
	mutex_unlock(&inode->i_mutex);
@@ -442,24 +424,14 @@ long do_utimes(int dfd, char __user *fil
	/* Don't worry, the checks are done in inode_change_ok() */
	newattrs.ia_valid = ATTR_CTIME | ATTR_MTIME | ATTR_ATIME;
	if (times) {
-		error = -EPERM;
-                if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
-                        goto dput_and_out;
-
		newattrs.ia_atime.tv_sec = times[0].tv_sec;
		newattrs.ia_atime.tv_nsec = times[0].tv_usec * 1000;
		newattrs.ia_mtime.tv_sec = times[1].tv_sec;
		newattrs.ia_mtime.tv_nsec = times[1].tv_usec * 1000;
		newattrs.ia_valid |= ATTR_ATIME_SET | ATTR_MTIME_SET;
-	} else {
-		error = -EACCES;
-                if (IS_IMMUTABLE(inode))
-                        goto dput_and_out;
-
-		if (current->fsuid != inode->i_uid &&
+	} else if (current->fsuid != inode->i_uid &&
		    (error = vfs_permission(&nd, MAY_WRITE)) != 0)
-			goto dput_and_out;
-	}
+		goto dput_and_out;
	mutex_lock(&inode->i_mutex);
	error = notify_change(nd.dentry, &newattrs);
	mutex_unlock(&inode->i_mutex);
@@ -638,9 +610,6 @@ asmlinkage long sys_fchmod(unsigned int 
	err = -EROFS;
	if (IS_RDONLY(inode))
		goto out_putf;
-	err = -EPERM;
-	if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
-		goto out_putf;
	mutex_lock(&inode->i_mutex);
	if (mode == (mode_t) -1)
		mode = inode->i_mode;
@@ -672,10 +641,6 @@ asmlinkage long sys_fchmodat(int dfd, co
	if (IS_RDONLY(inode))
		goto dput_and_out;

-	error = -EPERM;
-	if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
-		goto dput_and_out;
-
	mutex_lock(&inode->i_mutex);
	if (mode == (mode_t) -1)
		mode = inode->i_mode;
@@ -709,9 +674,6 @@ static int chown_common(struct dentry * 
	error = -EROFS;
	if (IS_RDONLY(inode))
		goto out;
-	error = -EPERM;
-	if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
-		goto out;
	newattrs.ia_valid =  ATTR_CTIME;
	if (user != (uid_t) -1) {
		newattrs.ia_valid |= ATTR_UID;
-
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