diff options
Diffstat (limited to 'fs/fscache/io.c')
| -rw-r--r-- | fs/fscache/io.c | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/fs/fscache/io.c b/fs/fscache/io.c index 74cde7acf434..e9e5d6758ea8 100644 --- a/fs/fscache/io.c +++ b/fs/fscache/io.c @@ -150,6 +150,44 @@ int __fscache_begin_read_operation(struct netfs_cache_resources *cres, } EXPORT_SYMBOL(__fscache_begin_read_operation); +/** + * fscache_set_page_dirty - Mark page dirty and pin a cache object for writeback + * @page: The page being dirtied + * @cookie: The cookie referring to the cache object + * + * Set the dirty flag on a page and pin an in-use cache object in memory when + * dirtying a page so that writeback can later write to it. This is intended + * to be called from the filesystem's ->set_page_dirty() method. + * + * Returns 1 if PG_dirty was set on the page, 0 otherwise. + */ +int fscache_set_page_dirty(struct page *page, struct fscache_cookie *cookie) +{ + struct inode *inode = page->mapping->host; + bool need_use = false; + + _enter(""); + + if (!__set_page_dirty_nobuffers(page)) + return 0; + if (!fscache_cookie_valid(cookie)) + return 1; + + if (!(inode->i_state & I_PINNING_FSCACHE_WB)) { + spin_lock(&inode->i_lock); + if (!(inode->i_state & I_PINNING_FSCACHE_WB)) { + inode->i_state |= I_PINNING_FSCACHE_WB; + need_use = true; + } + spin_unlock(&inode->i_lock); + + if (need_use) + fscache_use_cookie(cookie, true); + } + return 1; +} +EXPORT_SYMBOL(fscache_set_page_dirty); + struct fscache_write_request { struct netfs_cache_resources cache_resources; struct address_space *mapping; |