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-rw-r--r--fs/ext3/xattr_user.c79
1 files changed, 79 insertions, 0 deletions
diff --git a/fs/ext3/xattr_user.c b/fs/ext3/xattr_user.c
new file mode 100644
index 0000000..e907cae
--- /dev/null
+++ b/fs/ext3/xattr_user.c
@@ -0,0 +1,79 @@
+/*
+ * linux/fs/ext3/xattr_user.c
+ * Handler for extended user attributes.
+ *
+ * Copyright (C) 2001 by Andreas Gruenbacher, <a.gruenbacher@computer.org>
+ */
+
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/fs.h>
+#include <linux/smp_lock.h>
+#include <linux/ext3_jbd.h>
+#include <linux/ext3_fs.h>
+#include "xattr.h"
+
+#define XATTR_USER_PREFIX "user."
+
+static size_t
+ext3_xattr_user_list(struct inode *inode, char *list, size_t list_size,
+ const char *name, size_t name_len)
+{
+ const size_t prefix_len = sizeof(XATTR_USER_PREFIX)-1;
+ const size_t total_len = prefix_len + name_len + 1;
+
+ if (!test_opt(inode->i_sb, XATTR_USER))
+ return 0;
+
+ if (list && total_len <= list_size) {
+ memcpy(list, XATTR_USER_PREFIX, prefix_len);
+ memcpy(list+prefix_len, name, name_len);
+ list[prefix_len + name_len] = '\0';
+ }
+ return total_len;
+}
+
+static int
+ext3_xattr_user_get(struct inode *inode, const char *name,
+ void *buffer, size_t size)
+{
+ int error;
+
+ if (strcmp(name, "") == 0)
+ return -EINVAL;
+ if (!test_opt(inode->i_sb, XATTR_USER))
+ return -EOPNOTSUPP;
+ error = permission(inode, MAY_READ, NULL);
+ if (error)
+ return error;
+
+ return ext3_xattr_get(inode, EXT3_XATTR_INDEX_USER, name, buffer, size);
+}
+
+static int
+ext3_xattr_user_set(struct inode *inode, const char *name,
+ const void *value, size_t size, int flags)
+{
+ int error;
+
+ if (strcmp(name, "") == 0)
+ return -EINVAL;
+ if (!test_opt(inode->i_sb, XATTR_USER))
+ return -EOPNOTSUPP;
+ if ( !S_ISREG(inode->i_mode) &&
+ (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
+ return -EPERM;
+ error = permission(inode, MAY_WRITE, NULL);
+ if (error)
+ return error;
+
+ return ext3_xattr_set(inode, EXT3_XATTR_INDEX_USER, name,
+ value, size, flags);
+}
+
+struct xattr_handler ext3_xattr_user_handler = {
+ .prefix = XATTR_USER_PREFIX,
+ .list = ext3_xattr_user_list,
+ .get = ext3_xattr_user_get,
+ .set = ext3_xattr_user_set,
+};
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