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authorBjörn-Egil Dahlberg <psyeugenic@gmail.com>2011-04-14 20:23:39 +0200
committerBjörn-Egil Dahlberg <psyeugenic@gmail.com>2011-06-08 16:47:00 +0200
commit3a975c8778ca5684596f0247e225544d0a96617e (patch)
tree827556f08a7a81faed40a96b205ef228d77aa59b /erts/preloaded
parent45f5b2719226fe60dd26dd23ce4c1f7f9ca9225b (diff)
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Teach prim_file:list_dir/1,2 to use fname chunks
The efile driver will now use chunked data on list_dir. This will lessen the number of sends to prim_file and hence improve performance. This method is utilized in both direct and async cases.
Diffstat (limited to 'erts/preloaded')
-rw-r--r--erts/preloaded/src/prim_file.erl21
1 files changed, 20 insertions, 1 deletions
diff --git a/erts/preloaded/src/prim_file.erl b/erts/preloaded/src/prim_file.erl
index ac7570582e..b18a57bfef 100644
--- a/erts/preloaded/src/prim_file.erl
+++ b/erts/preloaded/src/prim_file.erl
@@ -111,6 +111,7 @@
-define(FILE_RESP_EOF, 8).
-define(FILE_RESP_FNAME, 9).
-define(FILE_RESP_ALL_DATA, 10).
+-define(FILE_RESP_LFNAME, 11).
%% Open modes for the driver's open function.
-define(EFILE_MODE_READ, 1).
@@ -914,6 +915,8 @@ drv_get_response(Port, R) when is_list(R) ->
{ok, R};
{ok, Name} ->
drv_get_response(Port, [Name|R]);
+ {append, Names} ->
+ drv_get_response(Port, append(Names, R));
Error ->
Error
end;
@@ -938,6 +941,8 @@ drv_get_response(Port) ->
%%%-----------------------------------------------------------------
%%% Utility functions.
+append([I | Is], R) when is_list(R) -> append(Is, [I | R]);
+append([], R) -> R.
%% Converts a list of mode atoms into an mode word for the driver.
@@ -1067,7 +1072,7 @@ translate_response(?FILE_RESP_N2DATA,
{ok, {Size, Offset, D}};
translate_response(?FILE_RESP_N2DATA = X, L0) when is_list(L0) ->
{Offset, L1} = get_uint64(L0),
- {ReadSize, L2} = get_uint64(L1),
+ {ReadSize, L2} = get_uint64(L1),
{Size, L3} = get_uint64(L2),
case {ReadSize, L3} of
{0, []} ->
@@ -1087,6 +1092,12 @@ translate_response(?FILE_RESP_FNAME, Data) when is_binary(Data) ->
{ok, prim_file:internal_native2name(Data)};
translate_response(?FILE_RESP_FNAME, Data) ->
{ok, Data};
+translate_response(?FILE_RESP_LFNAME, []) ->
+ ok;
+translate_response(?FILE_RESP_LFNAME, Data) when is_binary(Data) ->
+ {append, transform_lfname(Data)};
+translate_response(?FILE_RESP_LFNAME, Data) ->
+ {append, transform_lfname(Data)};
translate_response(?FILE_RESP_ALL_DATA, Data) ->
{ok, Data};
translate_response(X, Data) ->
@@ -1199,6 +1210,14 @@ transform_ldata(0, List, [Size | Sizes], R) ->
{Front, Rear} = lists_split(List, Size),
transform_ldata(0, Rear, Sizes, [Front | R]).
+transform_lfname(<<>>) -> [];
+transform_lfname(<<L:16, Name:L/binary, Names/binary>>) ->
+ [ prim_file:internal_native2name(Name) | transform_lfname(Names)];
+transform_lfname([]) -> [];
+transform_lfname([L1,L2|Names]) ->
+ L = (L1 bsl 8) bor L2,
+ {Name, Rest} = lists_split(Names, L),
+ [Name | transform_lfname(Rest)].
lists_split(List, 0) when is_list(List) ->