1 files changed, 99 insertions, 0 deletions
diff --git a/fs/attr.c b/fs/attr.c
new file mode 100644
index 000000000..be824dd4a
--- /dev/null
+++ b/fs/attr.c
@@ -0,0 +1,99 @@
+/*
+ *  linux/fs/attr.c
+ *
+ *  Copyright (C) 1991, 1992  Linus Torvalds
+ *  changes by Thomas Schoebel-Theuer
+ */
+
+#include <linux/stat.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/string.h>
+#include <asm/system.h>
+
+/* Taken over from the old code... */
+
+/* POSIX UID/GID verification for setting inode attributes. */
+int inode_change_ok(struct inode *inode, struct iattr *attr)
+{
+	/* If force is set do it anyway. */
+	if (attr->ia_valid & ATTR_FORCE)
+		return 0;
+
+	/* Make sure a caller can chown. */
+	if ((attr->ia_valid & ATTR_UID) &&
+	    (current->fsuid != inode->i_uid ||
+	     attr->ia_uid != inode->i_uid) && !fsuser())
+		return -EPERM;
+
+	/* Make sure caller can chgrp. */
+	if ((attr->ia_valid & ATTR_GID) &&
+	    (!in_group_p(attr->ia_gid) && attr->ia_gid != inode->i_gid) &&
+	    !fsuser())
+		return -EPERM;
+
+	/* Make sure a caller can chmod. */
+	if (attr->ia_valid & ATTR_MODE) {
+		if ((current->fsuid != inode->i_uid) && !fsuser())
+			return -EPERM;
+		/* Also check the setgid bit! */
+		if (!fsuser() && !in_group_p((attr->ia_valid & ATTR_GID) ? attr->ia_gid :
+					     inode->i_gid))
+			attr->ia_mode &= ~S_ISGID;
+	}
+
+	/* Check for setting the inode time. */
+	if ((attr->ia_valid & ATTR_ATIME_SET) &&
+	    ((current->fsuid != inode->i_uid) && !fsuser()))
+		return -EPERM;
+	if ((attr->ia_valid & ATTR_MTIME_SET) &&
+	    ((current->fsuid != inode->i_uid) && !fsuser()))
+		return -EPERM;
+	return 0;
+}
+
+void inode_setattr(struct inode * inode, struct iattr * attr)
+{
+	if(attr->ia_valid &
+	   (ATTR_UID|ATTR_GID|ATTR_SIZE|ATTR_ATIME|ATTR_MTIME|ATTR_CTIME|ATTR_MODE)) {
+		if (attr->ia_valid & ATTR_UID)
+			inode->i_uid = attr->ia_uid;
+		if (attr->ia_valid & ATTR_GID)
+			inode->i_gid = attr->ia_gid;
+		if (attr->ia_valid & ATTR_SIZE)
+			inode->i_size = attr->ia_size;
+		if (attr->ia_valid & ATTR_ATIME)
+			inode->i_atime = attr->ia_atime;
+		if (attr->ia_valid & ATTR_MTIME)
+			inode->i_mtime = attr->ia_mtime;
+		if (attr->ia_valid & ATTR_CTIME)
+			inode->i_ctime = attr->ia_ctime;
+		if (attr->ia_valid & ATTR_MODE) {
+			inode->i_mode = attr->ia_mode;
+			if (!fsuser() && !in_group_p(inode->i_gid))
+				inode->i_mode &= ~S_ISGID;
+		}
+		inode->i_dirt = 1;
+	}
+}
+
+int notify_change(struct inode * inode, struct iattr * attr)
+{
+	int error;
+	time_t now = CURRENT_TIME;
+
+	attr->ia_ctime = now;
+	if ((attr->ia_valid & (ATTR_ATIME | ATTR_ATIME_SET)) == ATTR_ATIME)
+		attr->ia_atime = now;
+	if ((attr->ia_valid & (ATTR_MTIME | ATTR_MTIME_SET)) == ATTR_MTIME)
+		attr->ia_mtime = now;
+	attr->ia_valid &= ~(ATTR_CTIME);
+	if (inode->i_sb && inode->i_sb->s_op && inode->i_sb->s_op->notify_change) 
+		return inode->i_sb->s_op->notify_change(inode, attr);
+	error = inode_change_ok(inode, attr);
+	if(!error)
+		inode_setattr(inode, attr);
+	return error;
+}
+