mirror of
https://gitlab.com/sortix/sortix.git
synced 2023-02-13 20:55:38 -05:00
117 lines
3 KiB
C++
117 lines
3 KiB
C++
/*******************************************************************************
|
|
|
|
Copyright(C) Jonas 'Sortie' Termansen 2013, 2015.
|
|
|
|
This file is part of Sortix.
|
|
|
|
Sortix is free software: you can redistribute it and/or modify it under the
|
|
terms of the GNU General Public License as published by the Free Software
|
|
Foundation, either version 3 of the License, or (at your option) any later
|
|
version.
|
|
|
|
Sortix is distributed in the hope that it will be useful, but WITHOUT ANY
|
|
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
|
|
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
|
|
details.
|
|
|
|
You should have received a copy of the GNU General Public License along with
|
|
Sortix. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
partition.cpp
|
|
Block device representing a partition of another block device.
|
|
|
|
*******************************************************************************/
|
|
|
|
#include <sys/types.h>
|
|
|
|
#include <errno.h>
|
|
|
|
#include <sortix/seek.h>
|
|
#include <sortix/stat.h>
|
|
|
|
#include <sortix/kernel/inode.h>
|
|
#include <sortix/kernel/ioctx.h>
|
|
#include <sortix/kernel/kernel.h>
|
|
#include <sortix/kernel/refcount.h>
|
|
|
|
#include "partition.h"
|
|
|
|
namespace Sortix {
|
|
|
|
Partition::Partition(Ref<Inode> inner_inode, off_t start, off_t length)
|
|
{
|
|
this->dev = (dev_t) this;
|
|
this->ino = (ino_t) this;
|
|
this->type = inner_inode->type;
|
|
this->inode_type = INODE_TYPE_FILE;
|
|
this->inner_inode = inner_inode;
|
|
this->start = start;
|
|
this->length = length;
|
|
}
|
|
|
|
Partition::~Partition()
|
|
{
|
|
}
|
|
|
|
int Partition::sync(ioctx_t* ctx)
|
|
{
|
|
return inner_inode->sync(ctx);
|
|
}
|
|
|
|
int Partition::truncate(ioctx_t* /*ctx*/, off_t new_length)
|
|
{
|
|
if ( new_length != length )
|
|
return errno = EPERM, -1;
|
|
return 0;
|
|
}
|
|
|
|
off_t Partition::lseek(ioctx_t* /*ctx*/, off_t offset, int whence)
|
|
{
|
|
if ( whence == SEEK_SET )
|
|
return offset;
|
|
if ( whence == SEEK_END )
|
|
// TODO: Avoid underflow and overflow!
|
|
return length + offset;
|
|
return errno = EINVAL, -1;
|
|
}
|
|
|
|
ssize_t Partition::pread(ioctx_t* ctx, uint8_t* buf, size_t count, off_t off)
|
|
{
|
|
// TODO: Avoid underflow and overflow!
|
|
off_t end_at = off + count;
|
|
if ( length <= end_at )
|
|
return 0;
|
|
off_t available = length - off;
|
|
if ( (uintmax_t) available < (uintmax_t) count )
|
|
count = available;
|
|
return inner_inode->pread(ctx, buf, count, start + off);
|
|
}
|
|
|
|
ssize_t Partition::pwrite(ioctx_t* ctx, const uint8_t* buf, size_t count,
|
|
off_t off)
|
|
{
|
|
// TODO: Avoid underflow and overflow!
|
|
off_t end_at = off + count;
|
|
if ( length <= end_at )
|
|
return 0;
|
|
off_t available = length - off;
|
|
if ( (uintmax_t) available < (uintmax_t) count )
|
|
count = available;
|
|
return inner_inode->pwrite(ctx, buf, count, start + off);
|
|
}
|
|
|
|
int Partition::stat(ioctx_t* ctx, struct stat* st)
|
|
{
|
|
if ( inner_inode->stat(ctx, st) < 0 )
|
|
return -1;
|
|
struct stat myst;
|
|
if ( !ctx->copy_from_src(&myst, st, sizeof(myst)) )
|
|
return -1;
|
|
myst.st_size = length;
|
|
myst.st_blocks = length / (myst.st_blksize ? myst.st_blksize : 1);
|
|
if ( !ctx->copy_to_dest(st, &myst, sizeof(myst)) )
|
|
return -1;
|
|
return 0;
|
|
}
|
|
|
|
}
|