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

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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: David Howells <dhowells@redhat.com>
Reviewed-by: Jeff 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
This commit is contained in:
David Howells 2021-10-20 23:10:46 +01:00
parent 8e7a867bb7
commit ed1235eb78
1 changed files with 22 additions and 0 deletions
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22
include/linux/fscache.h
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@ -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