JFS: Implement jfs_init_security

This atomically initializes the security xattr when an object is created
Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com>

fs/jfs/jfs_xattr.h

@@ -61,4 +61,14 @@ extern ssize_t jfs_getxattr(struct dentry *, const char *, void *, size_t);
 extern ssize_t jfs_listxattr(struct dentry *, char *, size_t);
 extern int jfs_removexattr(struct dentry *, const char *);
 
+#ifdef CONFIG_JFS_SECURITY
+extern int jfs_init_security(tid_t, struct inode *, struct inode *);
+#else
+static inline int jfs_init_security(tid_t tid, struct inode *inode,
+				    struct inode *dir)
+{
+	return 0;
+}
+#endif
+
 #endif	/* H_JFS_XATTR */

fs/jfs/namei.c

@@ -111,6 +111,12 @@ static int jfs_create(struct inode *dip, struct dentry *dentry, int mode,
 	if (rc)
 		goto out3;
 
+	rc = jfs_init_security(tid, ip, dip);
+	if (rc) {
+		txAbort(tid, 0);
+		goto out3;
+	}
+
 	if ((rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE))) {
 		jfs_err("jfs_create: dtSearch returned %d", rc);
 		txAbort(tid, 0);
@@ -239,6 +245,12 @@ static int jfs_mkdir(struct inode *dip, struct dentry *dentry, int mode)
 	if (rc)
 		goto out3;
 
+	rc = jfs_init_security(tid, ip, dip);
+	if (rc) {
+		txAbort(tid, 0);
+		goto out3;
+	}
+
 	if ((rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE))) {
 		jfs_err("jfs_mkdir: dtSearch returned %d", rc);
 		txAbort(tid, 0);
@@ -906,6 +918,10 @@ static int jfs_symlink(struct inode *dip, struct dentry *dentry,
 	down(&JFS_IP(dip)->commit_sem);
 	down(&JFS_IP(ip)->commit_sem);
 
+	rc = jfs_init_security(tid, ip, dip);
+	if (rc)
+		goto out3;
+
 	tblk = tid_to_tblock(tid);
 	tblk->xflag |= COMMIT_CREATE;
 	tblk->ino = ip->i_ino;
@@ -1349,6 +1365,12 @@ static int jfs_mknod(struct inode *dir, struct dentry *dentry,
 	if (rc)
 		goto out3;
 
+	rc = jfs_init_security(tid, ip, dir);
+	if (rc) {
+		txAbort(tid, 0);
+		goto out3;
+	}
+
 	if ((rc = dtSearch(dir, &dname, &ino, &btstack, JFS_CREATE))) {
 		txAbort(tid, 0);
 		goto out3;

fs/jfs/xattr.c

@@ -21,6 +21,7 @@
 #include <linux/xattr.h>
 #include <linux/posix_acl_xattr.h>
 #include <linux/quotaops.h>
+#include <linux/security.h>
 #include "jfs_incore.h"
 #include "jfs_superblock.h"
 #include "jfs_dmap.h"
@@ -1148,3 +1149,38 @@ int jfs_removexattr(struct dentry *dentry, const char *name)
 
 	return rc;
 }
+
+#ifdef CONFIG_JFS_SECURITY
+int jfs_init_security(tid_t tid, struct inode *inode, struct inode *dir)
+{
+	int rc;
+	size_t len;
+	void *value;
+	char *suffix;
+	char *name;
+
+	rc = security_inode_init_security(inode, dir, &suffix, &value, &len);
+	if (rc) {
+		if (rc == -EOPNOTSUPP)
+			return 0;
+		return rc;
+	}
+	name = kmalloc(XATTR_SECURITY_PREFIX_LEN + 1 + strlen(suffix),
+		       GFP_NOFS);
+	if (!name) {
+		rc = -ENOMEM;
+		goto kmalloc_failed;
+	}
+	strcpy(name, XATTR_SECURITY_PREFIX);
+	strcpy(name + XATTR_SECURITY_PREFIX_LEN, suffix);
+
+	rc = __jfs_setxattr(tid, inode, name, value, len, 0);
+
+	kfree(name);
+kmalloc_failed:
+	kfree(suffix);
+	kfree(value);
+
+	return rc;
+}
+#endif