diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/fscache-cache.h | 4 | ||||
| -rw-r--r-- | include/linux/fscache.h | 39 |
2 files changed, 43 insertions, 0 deletions
diff --git a/include/linux/fscache-cache.h b/include/linux/fscache-cache.h index 3f0b19dcfae7..3235ddbdcc09 100644 --- a/include/linux/fscache-cache.h +++ b/include/linux/fscache-cache.h @@ -304,6 +304,10 @@ struct fscache_cache_ops { /* dissociate a cache from all the pages it was backing */ void (*dissociate_pages)(struct fscache_cache *cache); + + /* Begin a read operation for the netfs lib */ + int (*begin_read_operation)(struct netfs_read_request *rreq, + struct fscache_retrieval *op); }; extern struct fscache_cookie fscache_fsdef_index; diff --git a/include/linux/fscache.h b/include/linux/fscache.h index 1f8dc72369ee..abc1c4737fb8 100644 --- a/include/linux/fscache.h +++ b/include/linux/fscache.h @@ -37,6 +37,7 @@ struct pagevec; struct fscache_cache_tag; struct fscache_cookie; struct fscache_netfs; +struct netfs_read_request; typedef void (*fscache_rw_complete_t)(struct page *page, void *context, @@ -191,6 +192,10 @@ extern void __fscache_update_cookie(struct fscache_cookie *, const void *); extern int __fscache_attr_changed(struct fscache_cookie *); extern void __fscache_invalidate(struct fscache_cookie *); extern void __fscache_wait_on_invalidate(struct fscache_cookie *); + +#ifdef FSCACHE_USE_NEW_IO_API +extern int __fscache_begin_read_operation(struct netfs_read_request *, struct fscache_cookie *); +#else extern int __fscache_read_or_alloc_page(struct fscache_cookie *, struct page *, fscache_rw_complete_t, @@ -214,6 +219,8 @@ extern void __fscache_uncache_all_inode_pages(struct fscache_cookie *, struct inode *); extern void __fscache_readpages_cancel(struct fscache_cookie *cookie, struct list_head *pages); +#endif /* FSCACHE_USE_NEW_IO_API */ + extern void __fscache_disable_cookie(struct fscache_cookie *, const void *, bool); extern void __fscache_enable_cookie(struct fscache_cookie *, const void *, loff_t, bool (*)(void *), void *); @@ -498,6 +505,36 @@ int fscache_reserve_space(struct fscache_cookie *cookie, loff_t size) return -ENOBUFS; } +#ifdef FSCACHE_USE_NEW_IO_API + +/** + * fscache_begin_read_operation - Begin a read operation for the netfs lib + * @rreq: The read request being undertaken + * @cookie: The cookie representing the cache object + * + * Begin a read operation on behalf of the netfs helper library. @rreq + * indicates the read request to which the operation state should be attached; + * @cookie indicates the cache object that will be accessed. + * + * This is intended to be called from the ->begin_cache_operation() netfs lib + * operation as implemented by the network filesystem. + * + * Returns: + * * 0 - Success + * * -ENOBUFS - No caching available + * * Other error code from the cache, such as -ENOMEM. + */ +static inline +int fscache_begin_read_operation(struct netfs_read_request *rreq, + struct fscache_cookie *cookie) +{ + if (fscache_cookie_valid(cookie) && fscache_cookie_enabled(cookie)) + return __fscache_begin_read_operation(rreq, cookie); + return -ENOBUFS; +} + +#else /* FSCACHE_USE_NEW_IO_API */ + /** * fscache_read_or_alloc_page - Read a page from the cache or allocate a block * in which to store it @@ -777,6 +814,8 @@ void fscache_uncache_all_inode_pages(struct fscache_cookie *cookie, __fscache_uncache_all_inode_pages(cookie, inode); } +#endif /* FSCACHE_USE_NEW_IO_API */ + /** * fscache_disable_cookie - Disable a cookie * @cookie: The cookie representing the cache object |