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netfs, cachefiles: Add a method to query presence of data in the cache

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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>
This commit is contained in:
David Howells
2022-01-27 16:02:50 +00:00
committed by Steve French
parent 052e04a52d
commit bee9f65523
3 changed files with 82 additions and 0 deletions
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7
include/linux/netfs.h
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@@ -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;