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file io bug fixes

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This commit is contained in:
Connor 2023-11-22 03:30:01 -08:00
parent d8f8594c13
commit 81f81d8e80
4 changed files with 82 additions and 32 deletions
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1
CMakeLists.txt
View File

@ -16,6 +16,7 @@ add_executable(fischl
lib/fs/datablock_manager.cpp
lib/fs/fs_data_types.cpp
lib/fs/fs_resize.cpp
lib/fs/fs_read_write.cpp
lib/fs/fs.cpp
lib/fs/inode_manager.cpp

2
include/fs_constants.hpp
View File

@ -1,6 +1,7 @@
#ifndef FS_CONSTANTS_HPP
#define FS_CONSTANTS_HPP
#include <algorithm>
#include <fcntl.h>
#include <inttypes.h>
#include <linux/fs.h>
@ -10,7 +11,6 @@
#include <sys/ioctl.h>
#include <unistd.h>
#define IO_BLOCK_SIZE 4096
#define NUM_INODE_BLOCKS 1023

38
lib/fs/fs_read_write.cpp
View File

@ -1,5 +1,4 @@
#include "fs.hpp"
#include <cmath>
class DatablockOperation {
public:
@ -44,7 +43,7 @@ int Fs::sweep_inode_datablocks(INode_Data *inode_data,
start_index -= IO_BLOCK_SIZE * IO_BLOCK_SIZE;
if (start_index < IO_BLOCK_SIZE * IO_BLOCK_SIZE * IO_BLOCK_SIZE) {
if (start_index < (u_int64_t)IO_BLOCK_SIZE * IO_BLOCK_SIZE * IO_BLOCK_SIZE) {
if ((result = sweep_datablocks(&(inode_data->triple_indirect_block), 3,
start_index, allocate, op)) <= 0)
return result;
@ -61,9 +60,6 @@ int Fs::sweep_datablocks(u_int64_t *block_num, int indirect_num,
char buf[IO_BLOCK_SIZE];
int err;
int result = -1;
u_int64_t temp;
u_int64_t next_block_num;
bool modified = false;
if (allocate && (*block_num) == 0)
if ((err = datablock_manager->new_datablock(block_num)) < 0)
@ -92,14 +88,14 @@ int Fs::sweep_datablocks(u_int64_t *block_num, int indirect_num,
bool modified = false;
for (size_t i = this_layer_start_index * sizeof(u_int64_t); i < IO_BLOCK_SIZE;
i += *sizeof(u_int64_t)) {
i += sizeof(u_int64_t)) {
read_u64(&temp, &buf[i]);
next_block_num = temp;
if ((result = sweep_datablocks(&next_block_num, indirect_num - 1,
next_layer_start_index, allocate, func)) < 0)
next_layer_start_index, allocate, op)) < 0)
return result;
if (next_block_num != temp) {
write_u64(&next_block_num, &buf[i]);
write_u64(next_block_num, &buf[i]);
modified = true;
}
if (result == 0)
@ -119,7 +115,11 @@ public:
char datablock_buf[IO_BLOCK_SIZE];
int err;
size_t read_size = min(IO_BLOCK_SIZE - offset, count);
// printf("PRINT: (%d) %d %d %d\n", block_num, count, offset,
// bytes_completed);
size_t read_size =
std::min(IO_BLOCK_SIZE - offset, count - bytes_completed);
if (block_num != 0) {
if ((err = disk->read_block(block_num, datablock_buf)) < 0)
@ -145,13 +145,13 @@ public:
char datablock_buf[IO_BLOCK_SIZE];
int err;
size_t write_size = min(IO_BLOCK_SIZE - offset, count);
size_t write_size =
std::min(IO_BLOCK_SIZE - offset, count - bytes_completed);
if (write_size < IO_BLOCK_SIZE)
if ((err = disk->read_block(block_num, datablock_buf)) < 0)
return err;
size_t write_size = min(IO_BLOCK_SIZE - offset, count);
memcpy(&datablock_buf[offset], &buf[bytes_completed], write_size);
if ((err = disk->write_block(block_num, datablock_buf)) < 0)
@ -171,17 +171,17 @@ ssize_t Fs::read(INode_Data *inode_data, char buf[], size_t count,
int err;
u_int64_t start_block_index = offset / IO_BLOCK_SIZE;
size_t internal_offset = offset - block_start;
size_t internal_offset = offset - (start_block_index * IO_BLOCK_SIZE);
ReadDatablockOperation op = ReadDatablockOperation();
op.offset = internal_offset;
op.buf = buf;
op.count = min(count, inode_data->metadata.size - offset);
op.count = std::min(count, inode_data->metadata.size - offset);
op.bytes_completed = 0;
op.disk = disk;
if ((err = sweep_inode_datablocks(inode_data, start_block_index, false, op)) <
0)
if ((err = sweep_inode_datablocks(inode_data, start_block_index, false,
&op)) < 0)
return err;
return op.bytes_completed;
@ -192,21 +192,21 @@ ssize_t Fs::write(INode_Data *inode_data, char buf[], size_t count,
int err;
u_int64_t start_block_index = offset / IO_BLOCK_SIZE;
size_t internal_offset = offset - block_start;
size_t internal_offset = offset - (start_block_index * IO_BLOCK_SIZE);
ReadDatablockOperation op = WriteDatablockOperation();
WriteDatablockOperation op = WriteDatablockOperation();
op.offset = internal_offset;
op.buf = buf;
op.count = count;
op.bytes_completed = 0;
op.disk = disk;
if ((err = sweep_inode_datablocks(inode_data, start_block_index, true, op)) <
if ((err = sweep_inode_datablocks(inode_data, start_block_index, true, &op)) <
0)
return err;
inode_data->metadata.size =
max(offset + op.bytes_completed, inode_data->metadata.size);
std::max(offset + op.bytes_completed, inode_data->metadata.size);
return op.bytes_completed;
}

73
lib/main.cpp
View File

@ -7,31 +7,80 @@ int main() {
// fischl *F = new fischl;
// F->init();
// char *d = strdup("/dev/vdc");
// RawDisk *disk = new FakeRawDisk(2048);
// Fs *fs = new Fs(disk);
// fs->format();
// disk->print_block(0);
// disk->print_block(1);
// INode_Data inode_data = INode_Data();
// fs->inode_manager->new_inode(1, 2, 3, &inode_data);
// int err;
// u_int64_t block_num = 0;
// for (int i = 0; i < 56 + 512 + 4; ++i)
// err = fs->allocate_datablock(&inode_data, &block_num);
// for (int i = 0; i < 5; ++i)
// printf("%d\n", err = fs->deallocate_datablock(&inode_data, &block_num));
// fs->inode_manager->save_inode(&inode_data);
// disk->print_block(0);
// disk->print_block(1);
// disk->print_block(1081);
// disk->print_block(1596);
// disk->print_block(1597);
int err;
RawDisk *disk = new FakeRawDisk(2048);
Fs *fs = new Fs(disk);
fs->format();
disk->print_block(0);
disk->print_block(1);
INode_Data inode_data = INode_Data();
INode_Data inode_data;
fs->inode_manager->new_inode(1, 2, 3, &inode_data);
int err;
u_int64_t block_num = 0;
for (int i = 0; i < 56 + 512 + 4; ++i)
err = fs->allocate_datablock(&inode_data, &block_num);
for (int i = 0; i < 5; ++i)
printf("%d\n", err = fs->deallocate_datablock(&inode_data, &block_num));
fs->inode_manager->save_inode(&inode_data);
disk->print_block(0);
disk->print_block(1);
int BL_SIZE = 4096 / 8;
u_int64_t buf[BL_SIZE * (56 + 512 + 10)];
for (int i = 0; i < BL_SIZE * (56 + 512 + 10); ++i)
buf[i] = (i / BL_SIZE) + 1;
err = fs->write(&inode_data, (char *)buf, 4096 * (56 + 3) + 16 + 8, 0);
fs->inode_manager->save_inode(&inode_data);
printf("Write %d", err);
disk->print_block(0);
disk->print_block(1);
disk->print_block(1025);
disk->print_block(1026);
disk->print_block(1027);
disk->print_block(1080);
disk->print_block(1081);
disk->print_block(1082);
disk->print_block(1083);
disk->print_block(1084);
disk->print_block(1085);
disk->print_block(1596);
int N = 5;
disk->print_block(1597);
u_int64_t buf2[4096] = {0};
err = fs->read(&inode_data, (char *)buf2, (8 * N), 4096 - 8 - 8);
printf("\n\nREAD: %d\n", err);
for (int i = 0; i < N; ++i)
printf("%d ", buf2[i]);
printf("\n");
return 0;
}