diff options
| -rw-r--r-- | include/linux/netfs.h | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/include/linux/netfs.h b/include/linux/netfs.h index cc1102040488..8479d63406f7 100644 --- a/include/linux/netfs.h +++ b/include/linux/netfs.h @@ -26,4 +26,61 @@ #define TestSetPageFsCache(page) TestSetPagePrivate2((page)) #define TestClearPageFsCache(page) TestClearPagePrivate2((page)) +/** + * set_page_fscache - Set PG_fscache on a page and take a ref + * @page: The page. + * + * Set the PG_fscache (PG_private_2) flag on a page and take the reference + * needed for the VM to handle its lifetime correctly. This sets the flag and + * takes the reference unconditionally, so care must be taken not to set the + * flag again if it's already set. + */ +static inline void set_page_fscache(struct page *page) +{ + set_page_private_2(page); +} + +/** + * end_page_fscache - Clear PG_fscache and release any waiters + * @page: The page + * + * Clear the PG_fscache (PG_private_2) bit on a page and wake up any sleepers + * waiting for this. The page ref held for PG_private_2 being set is released. + * + * This is, for example, used when a netfs page is being written to a local + * disk cache, thereby allowing writes to the cache for the same page to be + * serialised. + */ +static inline void end_page_fscache(struct page *page) +{ + end_page_private_2(page); +} + +/** + * wait_on_page_fscache - Wait for PG_fscache to be cleared on a page + * @page: The page to wait on + * + * Wait for PG_fscache (aka PG_private_2) to be cleared on a page. + */ +static inline void wait_on_page_fscache(struct page *page) +{ + wait_on_page_private_2(page); +} + +/** + * wait_on_page_fscache_killable - Wait for PG_fscache to be cleared on a page + * @page: The page to wait on + * + * Wait for PG_fscache (aka PG_private_2) to be cleared on a page or until a + * fatal signal is received by the calling task. + * + * Return: + * - 0 if successful. + * - -EINTR if a fatal signal was encountered. + */ +static inline int wait_on_page_fscache_killable(struct page *page) +{ + return wait_on_page_private_2_killable(page); +} + #endif /* _LINUX_NETFS_H */ |