diff options
Diffstat (limited to 'lib/kernel/src/ram_file.erl')
| -rw-r--r-- | lib/kernel/src/ram_file.erl | 48 |
1 files changed, 41 insertions, 7 deletions
diff --git a/lib/kernel/src/ram_file.erl b/lib/kernel/src/ram_file.erl index d996650948..48ea871433 100644 --- a/lib/kernel/src/ram_file.erl +++ b/lib/kernel/src/ram_file.erl @@ -1,19 +1,19 @@ %% %% %CopyrightBegin% -%% -%% Copyright Ericsson AB 1997-2009. All Rights Reserved. -%% +%% +%% Copyright Ericsson AB 1997-2010. All Rights Reserved. +%% %% The contents of this file are subject to the Erlang Public License, %% Version 1.1, (the "License"); you may not use this file except in %% compliance with the License. You should have received a copy of the %% Erlang Public License along with this software. If not, it can be %% retrieved online at http://www.erlang.org/. -%% +%% %% Software distributed under the License is distributed on an "AS IS" %% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See %% the License for the specific language governing rights and limitations %% under the License. -%% +%% %% %CopyrightEnd% %% -module(ram_file). @@ -24,11 +24,11 @@ -export([open/2, close/1]). -export([write/2, read/2, copy/3, pread/2, pread/3, pwrite/2, pwrite/3, - position/2, truncate/1, sync/1]). + position/2, truncate/1, datasync/1, sync/1]). %% Specialized file operations -export([get_size/1, get_file/1, set_file/2, get_file_close/1]). --export([compress/1, uncompress/1, uuencode/1, uudecode/1]). +-export([compress/1, uncompress/1, uuencode/1, uudecode/1, advise/4]). -export([open_mode/1]). %% used by ftp-file @@ -60,6 +60,7 @@ -define(RAM_FILE_TRUNCATE, 14). -define(RAM_FILE_PREAD, 17). -define(RAM_FILE_PWRITE, 18). +-define(RAM_FILE_FDATASYNC, 19). %% Other operations -define(RAM_FILE_GET, 30). @@ -70,6 +71,7 @@ -define(RAM_FILE_UUENCODE, 35). -define(RAM_FILE_UUDECODE, 36). -define(RAM_FILE_SIZE, 37). +-define(RAM_FILE_ADVISE, 38). %% Open modes for RAM_FILE_OPEN -define(RAM_FILE_MODE_READ, 1). @@ -90,6 +92,14 @@ -define(RAM_FILE_RESP_NUMBER, 3). -define(RAM_FILE_RESP_INFO, 4). +%% POSIX file advises +-define(POSIX_FADV_NORMAL, 0). +-define(POSIX_FADV_RANDOM, 1). +-define(POSIX_FADV_SEQUENTIAL, 2). +-define(POSIX_FADV_WILLNEED, 3). +-define(POSIX_FADV_DONTNEED, 4). +-define(POSIX_FADV_NOREUSE, 5). + %% -------------------------------------------------------------------------- %% Generic file contents operations. %% @@ -167,6 +177,8 @@ copy(#file_descriptor{module = ?MODULE} = Source, %% XXX Should be moved down to the driver for optimization. file:copy_opened(Source, Dest, Length). +datasync(#file_descriptor{module = ?MODULE, data = Port}) -> + call_port(Port, <<?RAM_FILE_FDATASYNC>>). sync(#file_descriptor{module = ?MODULE, data = Port}) -> call_port(Port, <<?RAM_FILE_FSYNC>>). @@ -349,6 +361,28 @@ uudecode(#file_descriptor{module = ?MODULE, data = Port}) -> uudecode(#file_descriptor{}) -> {error, enotsup}. +advise(#file_descriptor{module = ?MODULE, data = Port}, Offset, + Length, Advise) -> + Cmd0 = <<?RAM_FILE_ADVISE, Offset:64/signed, Length:64/signed>>, + case Advise of + normal -> + call_port(Port, <<Cmd0/binary, ?POSIX_FADV_NORMAL:32/signed>>); + random -> + call_port(Port, <<Cmd0/binary, ?POSIX_FADV_RANDOM:32/signed>>); + sequential -> + call_port(Port, <<Cmd0/binary, ?POSIX_FADV_SEQUENTIAL:32/signed>>); + will_need -> + call_port(Port, <<Cmd0/binary, ?POSIX_FADV_WILLNEED:32/signed>>); + dont_need -> + call_port(Port, <<Cmd0/binary, ?POSIX_FADV_DONTNEED:32/signed>>); + no_reuse -> + call_port(Port, <<Cmd0/binary, ?POSIX_FADV_NOREUSE:32/signed>>); + _ -> + {error, einval} + end; +advise(#file_descriptor{}, _Offset, _Length, _Advise) -> + {error, enotsup}. + %%%----------------------------------------------------------------- |