NFS: Writeback optimisation (34901f70) · Commits · 戴 / test

fs/nfs/write.c

+22 −10

Original line number	Diff line number	Diff line
		@@ -1325,27 +1325,39 @@ long nfs_sync_mapping_wait(struct address_space *mapping, struct writeback_contr
		return ret;
		}

		static int __nfs_write_mapping(struct address_space mapping, struct writeback_control wbc, int how)
		{
		int ret;

		ret = nfs_writepages(mapping, wbc);
		if (ret < 0)
		goto out;
		ret = nfs_sync_mapping_wait(mapping, wbc, how);
		if (ret < 0)
		goto out;
		return 0;
		out:
		__mark_inode_dirty(mapping->host, I_DIRTY_PAGES);
		return ret;
		}

		/* Two pass sync: first using WB_SYNC_NONE, then WB_SYNC_ALL */
		static int nfs_write_mapping(struct address_space *mapping, int how)
		{
		struct writeback_control wbc = {
		.bdi = mapping->backing_dev_info,
		.sync_mode = WB_SYNC_ALL,
		.sync_mode = WB_SYNC_NONE,
		.nr_to_write = LONG_MAX,
		.for_writepages = 1,
		.range_cyclic = 1,
		};
		int ret;

		ret = nfs_writepages(mapping, &wbc);
		if (ret < 0)
		goto out;
		ret = nfs_sync_mapping_wait(mapping, &wbc, how);
		ret = __nfs_write_mapping(mapping, &wbc, how);
		if (ret < 0)
		goto out;
		return 0;
		out:
		__mark_inode_dirty(mapping->host, I_DIRTY_PAGES);
		return ret;
		wbc.sync_mode = WB_SYNC_ALL;
		return __nfs_write_mapping(mapping, &wbc, how);
		}

		/*