diff options
Diffstat (limited to 'include/linux/fscache.h')
| -rw-r--r-- | include/linux/fscache.h | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/include/linux/fscache.h b/include/linux/fscache.h index 7a086235da4b..19b46458e4e8 100644 --- a/include/linux/fscache.h +++ b/include/linux/fscache.h @@ -183,6 +183,7 @@ extern struct fscache_cookie *__fscache_acquire_cookie( const struct fscache_cookie_def *, void *); extern void __fscache_relinquish_cookie(struct fscache_cookie *, int); +extern int __fscache_check_consistency(struct fscache_cookie *); extern void __fscache_update_cookie(struct fscache_cookie *); extern int __fscache_attr_changed(struct fscache_cookie *); extern void __fscache_invalidate(struct fscache_cookie *); @@ -208,6 +209,8 @@ extern bool __fscache_maybe_release_page(struct fscache_cookie *, struct page *, gfp_t); 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); /** * fscache_register_netfs - Register a filesystem as desiring caching services @@ -326,6 +329,25 @@ void fscache_relinquish_cookie(struct fscache_cookie *cookie, int retire) } /** + * fscache_check_consistency - Request that if the cache is updated + * @cookie: The cookie representing the cache object + * + * Request an consistency check from fscache, which passes the request + * to the backing cache. + * + * Returns 0 if consistent and -ESTALE if inconsistent. May also + * return -ENOMEM and -ERESTARTSYS. + */ +static inline +int fscache_check_consistency(struct fscache_cookie *cookie) +{ + if (fscache_cookie_valid(cookie)) + return __fscache_check_consistency(cookie); + else + return 0; +} + +/** * fscache_update_cookie - Request that a cache object be updated * @cookie: The cookie representing the cache object * @@ -570,6 +592,26 @@ int fscache_alloc_page(struct fscache_cookie *cookie, } /** + * fscache_readpages_cancel - Cancel read/alloc on pages + * @cookie: The cookie representing the inode's cache object. + * @pages: The netfs pages that we canceled write on in readpages() + * + * Uncache/unreserve the pages reserved earlier in readpages() via + * fscache_readpages_or_alloc() and similar. In most successful caches in + * readpages() this doesn't do anything. In cases when the underlying netfs's + * readahead failed we need to clean up the pagelist (unmark and uncache). + * + * This function may sleep as it may have to clean up disk state. + */ +static inline +void fscache_readpages_cancel(struct fscache_cookie *cookie, + struct list_head *pages) +{ + if (fscache_cookie_valid(cookie)) + __fscache_readpages_cancel(cookie, pages); +} + +/** * fscache_write_page - Request storage of a page in the cache * @cookie: The cookie representing the cache object * @page: The netfs page to store |