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xattr handlers: Simplify list operation

Browse source 
Change the list operation to only return whether or not an attribute
should be listed.  Copying the attribute names into the buffer is moved
to the callers.

Since the result only depends on the dentry and not on the attribute
name, we do not pass the attribute name to list operations.

Signed-off-by: Andreas Gruenbacher <[email protected]>
Signed-off-by: Al Viro <[email protected]>
This commit is contained in:
Andreas Gruenbacher 2015-12-02 14:44:43 +01:00 • committed by Al Viro
commit 764a5c6b1f
22 changed files with 113 additions and 335 deletions
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20
fs/xattr.c
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@ -723,23 +723,25 @@ generic_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size)
if (!buffer) {
for_each_xattr_handler(handlers, handler) {
if (!handler->list)
if (!handler->name ||
(handler->list && !handler->list(dentry)))
continue;
size += handler->list(handler, dentry, NULL, 0,
NULL, 0);
size += strlen(handler->name) + 1;
}
} else {
char *buf = buffer;
size_t len;
for_each_xattr_handler(handlers, handler) {
if (!handler->list)
if (!handler->name ||
(handler->list && !handler->list(dentry)))
continue;
size = handler->list(handler, dentry, buf, buffer_size,
NULL, 0);
if (size > buffer_size)
len = strlen(handler->name);
if (len + 1 > buffer_size)
return -ERANGE;
buf += size;
buffer_size -= size;
memcpy(buf, handler->name, len + 1);
buf += len + 1;
buffer_size -= len + 1;
}
size = buf - buffer;
}