From 134bcc1bfb17f4ebd8305b4f541d281bc098069d Mon Sep 17 00:00:00 2001
From: Jason Volk <jason@zemos.net>
Date: Sun, 5 May 2019 17:48:02 -0700
Subject: [PATCH] ircd::fs: Add write_opts for RWF_WRITE_LIFE_* support.

---
 include/ircd/fs/write.h | 6 ++++++
 ircd/fs.cc              | 5 +++++
 ircd/fs_aio.cc          | 5 +++++
 3 files changed, 16 insertions(+)

diff --git a/include/ircd/fs/write.h b/include/ircd/fs/write.h
index 89b935689..a12102b58 100644
--- a/include/ircd/fs/write.h
+++ b/include/ircd/fs/write.h
@@ -83,6 +83,12 @@ struct ircd::fs::write_opts
 	/// write with fsync(2)/fdsync(2) yourself.
 	bool metadata {false};
 
+	/// RWH_WRITE_LIFE integer representation (see fcntl(2) since Linux 4.13) if
+	/// supported; otherwise has no effect. As a write_opts option, this is only
+	/// meaningful if pwritev2(2) is available and the kernel recognizes the
+	/// RWF_WRITE_LIFE flag bits. See also fs::write_life(fd).
+	uint8_t write_life {0};
+
 	write_opts(const off_t & = 0);
 };
 
diff --git a/ircd/fs.cc b/ircd/fs.cc
index 86f048caa..6bf93a047 100644
--- a/ircd/fs.cc
+++ b/ircd/fs.cc
@@ -1317,6 +1317,11 @@ ircd::fs::flags(const write_opts &opts)
 		ret |= RWF_SYNC;
 	#endif
 
+	#ifdef RWF_WRITE_LIFE_SHIFT
+	if(support_rwf_write_life && opts.write_life)
+		ret |= (opts.write_life << (RWF_WRITE_LIFE_SHIFT));
+	#endif
+
 	return ret;
 }
 
diff --git a/ircd/fs_aio.cc b/ircd/fs_aio.cc
index 04e9c0a7f..7125fc0b2 100644
--- a/ircd/fs_aio.cc
+++ b/ircd/fs_aio.cc
@@ -276,6 +276,11 @@ ircd::fs::aio::request::write::write(const int &fd,
 	if(support_sync && opts.sync && opts.metadata)
 		aio_rw_flags |= RWF_SYNC;
 	#endif
+
+	#ifdef RWF_WRITE_LIFE_SHIFT
+	if(support_rwf_write_life && opts.write_life)
+		aio_rw_flags |= (opts.write_life << (RWF_WRITE_LIFE_SHIFT));
+	#endif
 }
 
 size_t