L4Re/departure

Annotated libfsserver/lib/files/ext2_filesystem.cc

645:3047b11cc814
7 months ago Paul Boddie Fixed the file_data_available result to return zero if the populated span has somehow become less than the current position in the memory region.
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/*
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 * A resource supporting the creation of user-specific ext2 filesystem opener
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 * resources.
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 *
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 * Copyright (C) 2021 Paul Boddie <paul@boddie.org.uk>
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 *
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 * This program is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU General Public License as
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 * published by the Free Software Foundation; either version 2 of
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 * the License, or (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor,
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 * Boston, MA  02110-1301, USA
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 */
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#include <resource/resource_server.h>
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#include "ext2_file_opener.h"
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#include "ext2_filesystem.h"
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Ext2Filesystem::Ext2Filesystem(Pages *pages, ext2_filsys fs)
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: FilesystemResource(pages)
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{
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    _ops = new Ext2FileOperations(fs);
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}
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Ext2Filesystem::~Ext2Filesystem()
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{
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    delete _ops;
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}
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/* Return a file opener object for the given user details. */
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long Ext2Filesystem::open_for_user(ipc_varg_sys_uid_t uid, ipc_varg_sys_gid_t gid,
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                                   ipc_varg_sys_mode_t umask, l4_cap_idx_t *ref)
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{
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    user_t user = (user_t) {uid.value, gid.value, umask.value};
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    return open_for_user(user, ref);
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}
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/* Return a file opener object for the given user. */
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long Ext2Filesystem::open_for_user(user_t user, l4_cap_idx_t *ref)
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{
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    Resource *resource = new Ext2FileOpener(this, _ops, user);
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    /* Complete the initialisation and start a server in a new thread.
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       If the thread does not start, the resource will be finalised. */
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    return ResourceServer(resource).start_thread(ref);
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}
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