From b8936261b5df070800876ebda0a46856c5b14bee Mon Sep 17 00:00:00 2001
From: Jason Volk <jason@zemos.net>
Date: Sun, 19 Aug 2018 01:14:54 -0700
Subject: [PATCH] ircd::db: Add some exception handlers on these envs.

---
 ircd/db.cc | 37 ++++++++++++++++++++++++++++++++++---
 1 file changed, 34 insertions(+), 3 deletions(-)

diff --git a/ircd/db.cc b/ircd/db.cc
index 62d4ff4e1..20c8f3e3e 100644
--- a/ircd/db.cc
+++ b/ircd/db.cc
@@ -2921,7 +2921,7 @@ noexcept
 rocksdb::Status
 ircd::db::database::env::random_access_file::Prefetch(uint64_t offset,
                                                       size_t length)
-noexcept
+noexcept try
 {
 	#ifdef RB_DEBUG_DB_ENV
 	log::debug
@@ -2934,16 +2934,32 @@ noexcept
 	};
 	#endif
 
+	fs::prefetch(fd, length, offset);
 	return Status::OK();
 }
+catch(const fs::filesystem_error &e)
+{
+	log::error
+	{
+		log, "'%s': rfile:%p prefetch offset:%zu length:%zu :%s",
+		d.name,
+		this,
+		offset,
+		length,
+		e.what()
+	};
+
+	return Status::InvalidArgument();
+}
 
 rocksdb::Status
 ircd::db::database::env::random_access_file::Read(uint64_t offset,
                                                   size_t length,
                                                   Slice *result,
                                                   char *scratch)
-const noexcept
+const noexcept try
 {
+	assert(result);
 	#ifdef RB_DEBUG_DB_ENV
 	log::debug
 	{
@@ -2957,7 +2973,6 @@ const noexcept
 	};
 	#endif
 
-	assert(result);
 	const mutable_buffer buf
 	{
 		scratch, length
@@ -2972,6 +2987,22 @@ const noexcept
 
 	return Status::OK();
 }
+catch(const fs::filesystem_error &e)
+{
+	log::error
+	{
+		log, "'%s': rfile:%p read:%p offset:%zu length:%zu scratch:%p :%s",
+		d.name,
+		this,
+		result,
+		offset,
+		length,
+		scratch,
+		e.what()
+	};
+
+	return Status::InvalidArgument();
+}
 
 rocksdb::Status
 ircd::db::database::env::random_access_file::InvalidateCache(size_t offset,