diff options
Diffstat (limited to 'fs/fs-writeback.c')
| -rw-r--r-- | fs/fs-writeback.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c index 99a2440c5588..7ec491b1be04 100644 --- a/fs/fs-writeback.c +++ b/fs/fs-writeback.c @@ -142,6 +142,35 @@ static void __wb_start_writeback(struct bdi_writeback *wb, long nr_pages, wb_queue_work(wb, work); } +#ifdef CONFIG_CGROUP_WRITEBACK + +/** + * inode_congested - test whether an inode is congested + * @inode: inode to test for congestion + * @cong_bits: mask of WB_[a]sync_congested bits to test + * + * Tests whether @inode is congested. @cong_bits is the mask of congestion + * bits to test and the return value is the mask of set bits. + * + * If cgroup writeback is enabled for @inode, the congestion state is + * determined by whether the cgwb (cgroup bdi_writeback) for the blkcg + * associated with @inode is congested; otherwise, the root wb's congestion + * state is used. + */ +int inode_congested(struct inode *inode, int cong_bits) +{ + if (inode) { + struct bdi_writeback *wb = inode_to_wb(inode); + if (wb) + return wb_congested(wb, cong_bits); + } + + return wb_congested(&inode_to_bdi(inode)->wb, cong_bits); +} +EXPORT_SYMBOL_GPL(inode_congested); + +#endif /* CONFIG_CGROUP_WRITEBACK */ + /** * bdi_start_writeback - start writeback * @bdi: the backing device to write from |