Make inode_ops->setxattr value parameter const

Add `const' to the value parameter definition of the setxattr inode
operation and fix the resulting warnings in fs/jfs/xattr.c: File
systems are not supposed to modify the value.

Also fixes the non-const usage in jfs.

--- linux-2.4.20-rc2.patch/include/linux/fs.h~xattr-const	2002-11-18 23:51:35.000000000 +0100
+++ linux-2.4.20-rc2.patch-agruen/include/linux/fs.h	2002-11-18 23:51:35.000000000 +0100
@@ -866,7 +866,7 @@
 	int (*revalidate) (struct dentry *);
 	int (*setattr) (struct dentry *, struct iattr *);
 	int (*getattr) (struct dentry *, struct iattr *);
-	int (*setxattr) (struct dentry *, const char *, void *, size_t, int);
+	int (*setxattr) (struct dentry *, const char *, const void *, size_t, int);
 	ssize_t (*getxattr) (struct dentry *, const char *, void *, size_t);
 	ssize_t (*listxattr) (struct dentry *, char *, size_t);
 	int (*removexattr) (struct dentry *, const char *);
--- linux-2.4.20-rc2.patch/fs/jfs/xattr.c~xattr-const	2002-11-18 23:51:35.000000000 +0100
+++ linux-2.4.20-rc2.patch-agruen/fs/jfs/xattr.c	2002-11-18 23:51:35.000000000 +0100
@@ -641,7 +641,7 @@
 }
 
 static int can_set_xattr(struct inode *inode, const char *name,
-			 void *value, size_t value_len)
+			 const void *value, size_t value_len)
 {
 	if (IS_RDONLY(inode))
 		return -EROFS;
@@ -660,7 +660,7 @@
 	return permission(inode, MAY_WRITE);
 }
 
-int __jfs_setxattr(struct inode *inode, const char *name, void *value,
+int __jfs_setxattr(struct inode *inode, const char *name, const void *value,
 		   size_t value_len, int flags)
 {
 	struct jfs_ea_list *ealist;
@@ -799,7 +799,7 @@
 	return rc;
 }
 
-int jfs_setxattr(struct dentry *dentry, const char *name, void *value,
+int jfs_setxattr(struct dentry *dentry, const char *name, const void *value,
 		 size_t value_len, int flags)
 {
 	if (value == NULL) {	/* empty EA, do not remove */
--- linux-2.4.20-rc2.patch/fs/jfs/jfs_xattr.h~xattr-const	2002-11-18 23:52:56.000000000 +0100
+++ linux-2.4.20-rc2.patch-agruen/fs/jfs/jfs_xattr.h	2002-11-18 23:40:27.000000000 +0100
@@ -52,8 +52,10 @@
 #define	END_EALIST(ealist) \
 	((struct jfs_ea *) (((char *) (ealist)) + EALIST_SIZE(ealist)))
 
-extern int __jfs_setxattr(struct inode *, const char *, void *, size_t, int);
-extern int jfs_setxattr(struct dentry *, const char *, void *, size_t, int);
+extern int __jfs_setxattr(struct inode *, const char *, const void *, size_t,
+			  int);
+extern int jfs_setxattr(struct dentry *, const char *, const void *, size_t,
+			int);
 extern ssize_t __jfs_getxattr(struct inode *, const char *, void *, size_t);
 extern ssize_t jfs_getxattr(struct dentry *, const char *, void *, size_t);
 extern ssize_t jfs_listxattr(struct dentry *, char *, size_t);

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