Commit ed1235eb authored by David Howells's avatar David Howells
Browse files

fscache: Provide a function to let the netfs update its coherency data 



Provide a function to let the netfs update its coherency data:

	void fscache_update_cookie(struct fscache_cookie *cookie,
				   const void *aux_data,
				   const loff_t *object_size);

This will update the auxiliary data and/or the size of the object attached
to a cookie if either pointer is not-NULL and flag that the disk needs to
be updated.

Note that fscache_unuse_cookie() also allows this to be done.

Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
Reviewed-by: default avatarJeff Layton <jlayton@kernel.org>
cc: linux-cachefs@redhat.com
Link: https://lore.kernel.org/r/163819610438.215744.4223265964131424954.stgit@warthog.procyon.org.uk/ # v1
Link: https://lore.kernel.org/r/163906913530.143852.18150303220217653820.stgit@warthog.procyon.org.uk/ # v2
Link: https://lore.kernel.org/r/163967117795.1823006.7493373142653442595.stgit@warthog.procyon.org.uk/ # v3
Link: https://lore.kernel.org/r/164021518440.640689.6369952464473039268.stgit@warthog.procyon.org.uk/ # v4
parent 8e7a867b

include/linux/fscache.h

+22 −0
Original line number Diff line number Diff line
@@ -338,6 +338,28 @@ void __fscache_update_cookie(struct fscache_cookie *cookie, const void *aux_data 
	set_bit(FSCACHE_COOKIE_NEEDS_UPDATE, &cookie->flags);

}



/**

 * fscache_update_cookie - Request that a cache object be updated

 * @cookie: The cookie representing the cache object

 * @aux_data: The updated auxiliary data for the cookie (may be NULL)

 * @object_size: The current size of the object (may be NULL)

 *

 * Request an update of the index data for the cache object associated with the

 * cookie.  The auxiliary data on the cookie will be updated first if @aux_data

 * is set and the object size will be updated and the object possibly trimmed

 * if @object_size is set.

 *

 * See Documentation/filesystems/caching/netfs-api.rst for a complete

 * description.

 */

static inline

void fscache_update_cookie(struct fscache_cookie *cookie, const void *aux_data,

			   const loff_t *object_size)

{

	if (fscache_cookie_enabled(cookie))

		__fscache_update_cookie(cookie, aux_data, object_size);

}



/**

 * fscache_invalidate - Notify cache that an object needs invalidation

 * @cookie: The cookie representing the cache object