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authorLukas Larsson <[email protected]>2014-01-27 12:01:45 +0100
committerLukas Larsson <[email protected]>2014-01-27 14:48:50 +0100
commit0b36ce01e81744f4c0b41bfe1f62b4bf5d0ece97 (patch)
treeef403bfcfc33a41edb54309319a4cf39ca81ecab /lib/kernel/src
parent045fcfc02ace59d07618f8983809236642bba630 (diff)
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erts/kernel: sendfile no longer uses async threads
This has been done because a slow client attack is possible if the async thread pool is used. The scenario is: Client does a request for a file and then slowly receives the file one byte at a time. This will eventually fill the async thread pool with blocking sendfile operations and thus starving the vm of all file operations. If you still want to use the async threads pool for sendfile an option to enable it has been introduced.
Diffstat (limited to 'lib/kernel/src')
-rw-r--r--lib/kernel/src/file.erl15
1 files changed, 7 insertions, 8 deletions
diff --git a/lib/kernel/src/file.erl b/lib/kernel/src/file.erl
index b5152018e0..23cf74f80f 100644
--- a/lib/kernel/src/file.erl
+++ b/lib/kernel/src/file.erl
@@ -111,7 +111,8 @@
-type date_time() :: calendar:datetime().
-type posix_file_advise() :: 'normal' | 'sequential' | 'random'
| 'no_reuse' | 'will_need' | 'dont_need'.
--type sendfile_option() :: {chunk_size, non_neg_integer()}.
+-type sendfile_option() :: {chunk_size, non_neg_integer()}
+ | {use_threads, boolean()}.
-type file_info_option() :: {'time', 'local'} | {'time', 'universal'}
| {'time', 'posix'}.
%%% BIFs
@@ -1229,8 +1230,7 @@ change_time(Name, {{AY, AM, AD}, {AH, AMin, ASec}}=Atime,
sendfile(File, _Sock, _Offet, _Bytes, _Opts) when is_pid(File) ->
{error, badarg};
sendfile(File, Sock, Offset, Bytes, []) ->
- sendfile(File, Sock, Offset, Bytes, ?MAX_CHUNK_SIZE, [], [],
- false, false, false);
+ sendfile(File, Sock, Offset, Bytes, ?MAX_CHUNK_SIZE, [], [], []);
sendfile(File, Sock, Offset, Bytes, Opts) ->
ChunkSize0 = proplists:get_value(chunk_size, Opts, ?MAX_CHUNK_SIZE),
ChunkSize = if ChunkSize0 > ?MAX_CHUNK_SIZE ->
@@ -1240,8 +1240,7 @@ sendfile(File, Sock, Offset, Bytes, Opts) ->
%% Support for headers, trailers and options has been removed because the
%% Darwin and BSD API for using it does not play nice with
%% non-blocking sockets. See unix_efile.c for more info.
- sendfile(File, Sock, Offset, Bytes, ChunkSize, [], [],
- false,false,false).
+ sendfile(File, Sock, Offset, Bytes, ChunkSize, [], [], Opts).
%% sendfile/2
-spec sendfile(Filename, Socket) ->
@@ -1261,17 +1260,17 @@ sendfile(Filename, Sock) ->
%% Internal sendfile functions
sendfile(#file_descriptor{ module = Mod } = Fd, Sock, Offset, Bytes,
- ChunkSize, Headers, Trailers, Nodiskio, MNowait, Sync)
+ ChunkSize, Headers, Trailers, Opts)
when is_port(Sock) ->
case Mod:sendfile(Fd, Sock, Offset, Bytes, ChunkSize, Headers, Trailers,
- Nodiskio, MNowait, Sync) of
+ Opts) of
{error, enotsup} ->
sendfile_fallback(Fd, Sock, Offset, Bytes, ChunkSize,
Headers, Trailers);
Else ->
Else
end;
-sendfile(_,_,_,_,_,_,_,_,_,_) ->
+sendfile(_,_,_,_,_,_,_,_) ->
{error, badarg}.
%%%