140 lines
3.2 KiB
C++
140 lines
3.2 KiB
C++
/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2011.
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This file is part of Sortix.
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Sortix is free software: you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the Free Software
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Foundation, either version 3 of the License, or (at your option) any later
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version.
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Sortix is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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details.
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You should have received a copy of the GNU General Public License along with
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Sortix. If not, see <http://www.gnu.org/licenses/>.
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mount.cpp
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Handles system wide mount points and initialization of new file systems.
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*******************************************************************************/
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#include <sortix/kernel/platform.h>
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#include <sortix/kernel/panic.h>
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#include <sortix/kernel/string.h>
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#include <string.h>
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#include "mount.h"
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#include "fs/ramfs.h"
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#include "fs/initfs.h"
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#include "fs/devfs.h"
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namespace Sortix
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{
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class MountPoint
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{
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public:
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MountPoint(DevFileSystem* fs, char* path);
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~MountPoint();
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public:
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MountPoint* prev;
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MountPoint* next;
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public:
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DevFileSystem* fs;
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char* path;
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};
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MountPoint::MountPoint(DevFileSystem* fs, char* path)
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{
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this->path = path;
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this->fs = fs;
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this->fs->Refer();
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prev = NULL;
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next = NULL;
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}
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MountPoint::~MountPoint()
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{
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fs->Unref();
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delete[] path;
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}
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namespace Mount
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{
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MountPoint* root;
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bool MatchesMountPath(const char* path, const char* mount)
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{
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size_t mountlen = strlen(mount);
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if ( !String::StartsWith(path, mount) ) { return false; }
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int c = path[mountlen];
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return c == '/' || c == '\0';
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}
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DevFileSystem* WhichFileSystem(const char* path, size_t* pathoffset)
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{
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DevFileSystem* result = NULL;
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*pathoffset = 0;
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for ( MountPoint* tmp = root; tmp; tmp = tmp->next )
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{
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if ( MatchesMountPath(path, tmp->path) )
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{
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result = tmp->fs;
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*pathoffset = strlen(tmp->path);
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}
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}
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return result;
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}
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bool Register(DevFileSystem* fs, const char* path)
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{
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char* newpath = String::Clone(path);
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if ( !newpath ) { return false; }
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MountPoint* mp = new MountPoint(fs, newpath);
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if ( !mp ) { delete[] newpath; return false; }
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if ( !root ) { root = mp; return true; }
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if ( strcmp(path, root->path) < 0 )
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{
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mp->next = root;
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root->prev = mp;
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root = mp;
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return false;
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}
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for ( MountPoint* tmp = root; tmp; tmp = tmp->next )
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{
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if ( tmp->next == NULL || strcmp(path, tmp->next->path) < 0 )
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{
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mp->next = tmp->next;
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tmp->next = mp;
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return true;
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}
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}
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return false; // Shouldn't happen.
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}
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void Init()
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{
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root = NULL;
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DevFileSystem* rootfs = new DevRAMFS();
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if ( !rootfs || !Register(rootfs, "") ) { Panic("Unable to allocate rootfs"); }
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DevFileSystem* initfs = new DevInitFS();
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if ( !initfs || !Register(initfs, "/bin") ) { Panic("Unable to allocate initfs"); }
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DevFileSystem* devfs = new DevDevFS();
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if ( !devfs || !Register(devfs, "/dev") ) { Panic("Unable to allocate devfs"); }
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}
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}
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}
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