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
void __inode_attach_wb(struct inode *inode, struct page *page);
void wb_memcg_offline(struct mem_cgroup *memcg);
void wb_blkcg_offline(struct blkcg *blkcg);
+int inode_congested(struct inode *inode, int cong_bits);
/**
* inode_cgwb_enabled - test whether cgroup writeback is enabled on an inode
{
}
+static inline int inode_congested(struct inode *inode, int cong_bits)
+{
+ return wb_congested(&inode_to_bdi(inode)->wb, cong_bits);
+}
+
#endif /* CONFIG_CGROUP_WRITEBACK */
+static inline int inode_read_congested(struct inode *inode)
+{
+ return inode_congested(inode, 1 << WB_sync_congested);
+}
+
+static inline int inode_write_congested(struct inode *inode)
+{
+ return inode_congested(inode, 1 << WB_async_congested);
+}
+
+static inline int inode_rw_congested(struct inode *inode)
+{
+ return inode_congested(inode, (1 << WB_sync_congested) |
+ (1 << WB_async_congested));
+}
+
static inline int bdi_congested(struct backing_dev_info *bdi, int cong_bits)
{
return wb_congested(&bdi->wb, cong_bits);
case POSIX_FADV_NOREUSE:
break;
case POSIX_FADV_DONTNEED:
- if (!bdi_write_congested(bdi))
+ if (!inode_write_congested(mapping->host))
__filemap_fdatawrite_range(mapping, offset, endbyte,
WB_SYNC_NONE);
/*
* Defer asynchronous read-ahead on IO congestion.
*/
- if (bdi_read_congested(inode_to_bdi(mapping->host)))
+ if (inode_read_congested(mapping->host))
return;
/* do read-ahead */
return page_count(page) - page_has_private(page) == 2;
}
-static int may_write_to_queue(struct backing_dev_info *bdi,
- struct scan_control *sc)
+static int may_write_to_inode(struct inode *inode, struct scan_control *sc)
{
if (current->flags & PF_SWAPWRITE)
return 1;
- if (!bdi_write_congested(bdi))
+ if (!inode_write_congested(inode))
return 1;
- if (bdi == current->backing_dev_info)
+ if (inode_to_bdi(inode) == current->backing_dev_info)
return 1;
return 0;
}
}
if (mapping->a_ops->writepage == NULL)
return PAGE_ACTIVATE;
- if (!may_write_to_queue(inode_to_bdi(mapping->host), sc))
+ if (!may_write_to_inode(mapping->host, sc))
return PAGE_KEEP;
if (clear_page_dirty_for_io(page)) {
*/
mapping = page_mapping(page);
if (((dirty || writeback) && mapping &&
- bdi_write_congested(inode_to_bdi(mapping->host))) ||
+ inode_write_congested(mapping->host)) ||
(writeback && PageReclaim(page)))
nr_congested++;