i_op->listxattr semantics

[Will Dyson <will_dyson@pobox.com>]

Hello all,

I am attempting to implement support for extended attributes in the Be
Filesystem (befs) driver. But I am stuck trying to figure out why the
getfattr program does not list my attributes.

Below is a test version of befs_listxattr that gives all files one
attribute named "MyAttr". When I mount my filesystem on /befs (in
2.5.69-uml) and issue the command "getfattr -d /befs", no attributes are
printed. The debugging statements appear in my syslog, so I know the
function is being called.

Can anyone help me figure out what I am doing wrong? Thanks!

static ssize_t
befs_listxattr(struct dentry *dentry, char *buffer, size_t size)
{
	struct super_block *sb = dentry->d_inode->i_sb;
	ssize_t attr_len = 0;
	char *attr = "MyAttr";

	befs_debug(sb, "---> befs_listxattr for inode %lu "
			"with %d buffer_size",
			dentry->d_inode->i_ino, size);

	attr_len = strlen(attr);
	
	if (buffer) {
		memcpy(buffer, attr, attr_len);
		buffer[attr_len] = '\0';
	}
	
	befs_debug(sb, "<--- befs_listxattr");
	return attr_len + 1;
}



-- 
Will Dyson
"Back off man, I'm a scientist!" -Dr. Peter Venkman