diff options
| author | David Howells | 2022-01-27 16:02:50 +0000 |
|---|---|---|
| committer | Steve French | 2022-02-01 10:29:18 -0600 |
| commit | bee9f65523218e3baeeecde9295c8fbe9bc08e0a (patch) | |
| tree | e13793dfdc27b40a31150029b30904f0eba699d3 /include/linux | |
| parent | 052e04a52dcd3359ba1df25a508a3a93707a3f6e (diff) | |
netfs, cachefiles: Add a method to query presence of data in the cache
Add a netfs_cache_ops method by which a network filesystem can ask the
cache about what data it has available and where so that it can make a
multipage read more efficient.
Signed-off-by: David Howells <dhowells@redhat.com>
cc: linux-cachefs@redhat.com
Acked-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Rohith Surabattula <rohiths@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/netfs.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/netfs.h b/include/linux/netfs.h index b46c39d98bbd..614f22213e21 100644 --- a/include/linux/netfs.h +++ b/include/linux/netfs.h @@ -244,6 +244,13 @@ struct netfs_cache_ops { int (*prepare_write)(struct netfs_cache_resources *cres, loff_t *_start, size_t *_len, loff_t i_size, bool no_space_allocated_yet); + + /* Query the occupancy of the cache in a region, returning where the + * next chunk of data starts and how long it is. + */ + int (*query_occupancy)(struct netfs_cache_resources *cres, + loff_t start, size_t len, size_t granularity, + loff_t *_data_start, size_t *_data_len); }; struct readahead_control; |