114 lines
3.1 KiB
C++
114 lines
3.1 KiB
C++
/*
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* Copyright (c) 2012, 2017 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* fs/util.cpp
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* Utility classes for kernel filesystems.
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*/
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#include <assert.h>
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#include <errno.h>
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#include <string.h>
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#include <sortix/stat.h>
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#include <sortix/seek.h>
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#include <sortix/kernel/inode.h>
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#include <sortix/kernel/interlock.h>
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#include <sortix/kernel/ioctx.h>
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#include <sortix/kernel/kernel.h>
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#include <sortix/kernel/kthread.h>
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#include <sortix/kernel/refcount.h>
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#include "util.h"
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namespace Sortix {
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UtilMemoryBuffer::UtilMemoryBuffer(dev_t dev, ino_t ino, uid_t owner,
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gid_t group, mode_t mode, uint8_t* buf,
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off_t bufsize, bool write, bool deletebuf)
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{
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assert(0 <= bufsize);
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inode_type = INODE_TYPE_FILE;
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this->filelock = KTHREAD_MUTEX_INITIALIZER;
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this->stat_uid = owner;
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this->stat_gid = group;
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this->type = S_IFREG;
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this->stat_mode = (mode & S_SETABLE) | this->type;
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this->stat_blksize = 1;
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this->stat_size = bufsize;
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this->dev = dev;
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this->ino = ino ? ino : (ino_t) this;
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this->buf = buf;
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this->bufsize = bufsize;
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this->write = write;
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this->deletebuf = deletebuf;
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}
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UtilMemoryBuffer::~UtilMemoryBuffer()
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{
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if ( deletebuf )
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delete[] buf;
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}
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int UtilMemoryBuffer::truncate(ioctx_t* /*ctx*/, off_t length)
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{
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ScopedLock lock(&filelock);
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if ( length != bufsize )
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return errno = EPERM, -1;
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return 0;
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}
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off_t UtilMemoryBuffer::lseek(ioctx_t* /*ctx*/, off_t offset, int whence)
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{
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ScopedLock lock(&filelock);
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if ( whence == SEEK_END && offset == 0 )
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return bufsize;
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return errno = EINVAL, -1;
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}
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ssize_t UtilMemoryBuffer::pread(ioctx_t* ctx, uint8_t* dest, size_t count,
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off_t off)
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{
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ScopedLock lock(&filelock);
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if ( bufsize < off )
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return 0;
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off_t available = bufsize - off;
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if ( (uintmax_t) available < (uintmax_t) count )
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count = available;
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if ( !ctx->copy_to_dest(dest, buf + off, count) )
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return -1;
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return count;
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}
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ssize_t UtilMemoryBuffer::pwrite(ioctx_t* ctx, const uint8_t* src, size_t count,
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off_t off)
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{
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ScopedLock lock(&filelock);
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if ( !write )
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return errno = EROFS, -1;
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if ( bufsize < off )
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return errno = EFBIG, -1;
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off_t available = bufsize - off;
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if ( available == 0 && count )
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return errno = EFBIG, -1;
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if ( (uintmax_t) available < (uintmax_t) count )
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count = available;
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if ( !ctx->copy_from_src(buf + off, src, count) )
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return -1;
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return count;
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}
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} // namespace Sortix
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