165 lines
3.5 KiB
C
165 lines
3.5 KiB
C
/*
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* Copyright 2010 Stefan Lankes, Chair for Operating Systems,
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* RWTH Aachen University
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* This file is part of MetalSVM.
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*/
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#include <metalsvm/stdio.h>
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#include <metalsvm/string.h>
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#include <metalsvm/fs.h>
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#include <metalsvm/errno.h>
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#include <metalsvm/spinlock.h>
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vfs_node_t* fs_root = NULL; // The root of the filesystem.
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ssize_t read_fs(vfs_node_t* node, uint8_t* buffer, size_t size, off_t offset)
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{
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ssize_t ret = -EINVAL;
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if (BUILTIN_EXPECT(!node || !buffer, 0))
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return ret;
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spinlock_lock(&node->lock);
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// Has the node got a read callback?
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if (node->read != 0)
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ret = node->read(node, buffer, size, offset);
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spinlock_unlock(&node->lock);
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return ret;
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}
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ssize_t write_fs(vfs_node_t* node, uint8_t* buffer, size_t size, off_t offset)
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{
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ssize_t ret = -EINVAL;
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if (BUILTIN_EXPECT(!node || !buffer, 0))
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return ret;
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spinlock_lock(&node->lock);
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// Has the node got a write callback?
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if (node->write != 0)
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ret = node->write(node, buffer, size, offset);
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spinlock_unlock(&node->lock);
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return ret;
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}
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int open_fs(vfs_node_t* node, uint8_t read, uint8_t write)
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{
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int ret = -EINVAL;
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if (BUILTIN_EXPECT(!node, 0))
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return ret;
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spinlock_lock(&node->lock);
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// Has the node got an open callback?
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if (node->open != 0)
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ret = node->open(node);
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spinlock_unlock(&node->lock);
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return ret;
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}
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int close_fs(vfs_node_t* node)
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{
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int ret = -EINVAL;
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if (BUILTIN_EXPECT(!node, 0))
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return ret;
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spinlock_lock(&node->lock);
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// Has the node got a close callback?
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if (node->close != 0)
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ret = node->close(node);
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spinlock_unlock(&node->lock);
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return ret;
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}
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struct dirent* readdir_fs(vfs_node_t * node, uint32_t index)
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{
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struct dirent* ret = NULL;
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if (BUILTIN_EXPECT(!node, 0))
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return ret;
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spinlock_lock(&node->lock);
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// Is the node a directory, and does it have a callback?
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if ((node->type == FS_DIRECTORY) && node->readdir != 0)
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ret = node->readdir(node, index);
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spinlock_unlock(&node->lock);
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return ret;
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}
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vfs_node_t* finddir_fs(vfs_node_t* node, const char *name)
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{
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vfs_node_t* ret = NULL;
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if (BUILTIN_EXPECT(!node, 0))
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return ret;
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spinlock_lock(&node->lock);
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// Is the node a directory, and does it have a callback?
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if ((node->type == FS_DIRECTORY) && node->finddir != 0)
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ret = node->finddir(node, name);
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spinlock_unlock(&node->lock);
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return ret;
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}
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vfs_node_t* mkdir_fs(vfs_node_t* node, const char *name)
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{
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vfs_node_t* ret = NULL;
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if (BUILTIN_EXPECT(!node, 0))
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return ret;
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spinlock_lock(&node->lock);
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if (node->mkdir != 0)
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ret = node->mkdir(node, name);
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spinlock_unlock(&node->lock);
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return ret;
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}
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vfs_node_t* findnode_fs(const char* name)
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{
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uint32_t i, j = 1;
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vfs_node_t* ret = NULL;
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char fname[MAX_FNAME];
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if (BUILTIN_EXPECT(!name, 0))
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return ret;
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if (name[0] == '/')
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ret = fs_root;
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while((name[j] != '\0') && ret) {
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i = 0;
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while((name[j] != '/') && (name[j] != '\0')) {
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fname[i] = name[j];
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i++; j++;
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}
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fname[i] = '\0';
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ret = finddir_fs(ret, fname);
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if (name[j] == '/')
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j++;
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}
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return ret;
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}
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