include/fs.hpp

@@ -18,7 +18,7 @@ public:
   ssize_t read(INode_Data *inode_data, char buf[], size_t count, size_t offset);
   ssize_t write(INode_Data *inode_data, const char buf[], size_t count,
                 size_t offset);
-  int truncate(INode_Data *inode_data, off_t length);
+  int truncate(INode_Data *inode_data, size_t length);
   ssize_t lseek_next_data(INode_Data *inode_data, size_t offset);
   ssize_t lseek_next_hole(INode_Data *inode_data, size_t offset);
 

include/fs/fs_data_types.hpp

@@ -41,10 +41,6 @@ public:
 
 #define NUMBER_OF_DIRECT_BLOCKS                                                \
   (((INODE_SIZE - NUMBER_OF_METADATA_BYTES) / sizeof(u_int64_t)) - 3)
-#define FILE_SIZE_MAX                                                          \
-  (IO_BLOCK_SIZE * (NUMBER_OF_DIRECT_BLOCKS + INDIRECT_BLOCKS +                \
-                    (INDIRECT_BLOCKS * INDIRECT_BLOCKS) +                      \
-                    (INDIRECT_BLOCKS * INDIRECT_BLOCKS * INDIRECT_BLOCKS)))
 
   u_int64_t single_indirect_block, double_indirect_block, triple_indirect_block;
   u_int64_t direct_blocks[NUMBER_OF_DIRECT_BLOCKS];

include/fs_constants.hpp

@@ -2,7 +2,6 @@
 #define FS_CONSTANTS_HPP
 
 #include <algorithm>
-#include <errno.h>
 #include <fcntl.h>
 #include <inttypes.h>
 #include <linux/fs.h>
@@ -12,11 +11,10 @@
 #include <sys/ioctl.h>
 #include <unistd.h>
 
-
 #define IO_BLOCK_SIZE 4096
 #define INDIRECT_BLOCKS 512
 
-#define NUM_INODE_BLOCKS 262143
+#define NUM_INODE_BLOCKS 1023
 
 #define INODE_SIZE 512
 

lib/files.cpp

@@ -55,7 +55,8 @@ void FilesOperation::initialize(bool load) {
         root_node = fischl_init_entry(1, "/", root_inode);
         assert(root_node->self_info!=NULL);
         fs->load_superblock();
-  } else {
+    }
+    else{
         initialize_rootinode();
     }
 }
@@ -116,9 +117,7 @@ INode_Data *FilesOperation::create_new_inode(u_int64_t parent_inode_number,
     bool allocated = false;
     INode_Data *new_inode = new INode_Data();
     fs->inode_manager->new_inode(getuid(), getgid(), mode, new_inode);
-  printf("NEW INODE %llu %llu %llu %o\n", new_inode->inode_num,
-         new_inode->metadata.uid, new_inode->metadata.gid,
-         (mode_t)new_inode->metadata.permissions);
+    //printf("%llu\n",new_inode->inode_num);
     if ((mode & S_IFMT) == S_IFDIR) {
         create_dot_dotdot(new_inode, parent_inode_number);
         fs->inode_manager->save_inode(new_inode);
@@ -213,17 +212,14 @@ u_int64_t FilesOperation::disk_namei(const char *path) {
 
 u_int64_t FilesOperation::namei(const char* path) {
     FileNode* filenode = fischl_load_entry(root_node, path);
-  if (filenode)
-    return filenode->inode_number;
-  else
-    return -1;
+    if (filenode) return filenode->inode_number;
+    else return -1;
 }
 
 bool FilesOperation::permission_check(int mask, INode_Data *inode) {
     mode_t per = (mode_t)inode->metadata.permissions;
     uid_t uid = (uid_t)inode->metadata.uid;
     gid_t gid = (gid_t)inode->metadata.gid;
-  if (getuid() == 0) return true;
     //printf("PERMISSION CHECK %d %llu %llu %o\n", mask, uid, gid, per);
     if(getuid() == uid){
         if ((mask & R_OK) && !(per & S_IRUSR)) {
@@ -238,7 +234,8 @@ bool FilesOperation::permission_check(int mask, INode_Data *inode) {
             return false; // Permission denied for executing
         }
         return true;
-  } else if (getgid() == gid) {
+    }
+    else if(getgid() == gid){
         if ((mask & R_OK) && !(per & S_IRGRP)) {
             return false; // Permission denied for reading
         }
@@ -251,7 +248,8 @@ bool FilesOperation::permission_check(int mask, INode_Data *inode) {
             return false; // Permission denied for executing
         }
         return true;
-  } else {
+    }
+    else{
         if ((mask & R_OK) && !(per & S_IROTH)) {
             return false; // Permission denied for reading
         }
@@ -267,8 +265,7 @@ bool FilesOperation::permission_check(int mask, INode_Data *inode) {
     }
 }
 
-bool FilesOperation::permission_check_by_inode_num(int mask,
-                                                   u_int64_t inode_num) {
+bool FilesOperation::permission_check_by_inode_num(int mask, u_int64_t inode_num) {
     INode_Data inode;
     inode.inode_num = inode_num;
     
@@ -305,12 +302,9 @@ int FilesOperation::fischl_mkdir(const char *path, mode_t mode) {
   char *ParentPath = pathdup; // pathdup are separated by pathdup, so it take
                               // <parent path> only
 
-  FileNode *parent_filenode = strlen(ParentPath)
-                                  ? fischl_load_entry(root_node, ParentPath)
-                                  : root_node->self_info;
+    FileNode *parent_filenode = strlen(ParentPath)? fischl_load_entry(root_node, ParentPath): root_node->self_info;
     if (parent_filenode == NULL) {
-    fprintf(stderr, "[%s ,%d] ParentPath:{%s} not found\n", __func__, __LINE__,
-            ParentPath);
+        fprintf(stderr,"[%s ,%d] ParentPath:{%s} not found\n",__func__,__LINE__, ParentPath);
         free(pathdup);
         return -ENOENT;//parentpath directory does not exist
     }
@@ -319,15 +313,11 @@ int FilesOperation::fischl_mkdir(const char *path, mode_t mode) {
         return -EACCES;
     }
 
-  // printf("%s, %llu, %s\n", parent_filenode->name, parent_inode_number,
-  // newDirname); make new inode
-  INode_Data *ret =
-      create_new_inode(parent_inode_number, newDirname,
-                       mode | S_IFDIR); // specify S_IFDIR as directory
-  if (ret == NULL)
-    return -1; // ENOSPC but create_new_inode handle ENAMETOOLONG EEXIST
-  fischl_add_entry(parent_filenode->subdirectory, ret->inode_num, newDirname,
-                   ret);
+    //printf("%s, %llu, %s\n", parent_filenode->name, parent_inode_number, newDirname);
+    //make new inode
+    INode_Data* ret = create_new_inode(parent_inode_number, newDirname, mode|S_IFDIR);//specify S_IFDIR as directory
+    if (ret == NULL) return -1;//ENOSPC but create_new_inode handle ENAMETOOLONG EEXIST
+    fischl_add_entry(parent_filenode->subdirectory, ret->inode_num, newDirname, ret);
     free(pathdup);
     return 0;//SUCCESS
 }
@@ -338,20 +328,13 @@ int FilesOperation::fischl_mknod(const char *path, mode_t mode, dev_t dev) {
     //check path
     char *pathdup = strdup(path);
     char *lastSlash = strrchr(pathdup, '/');
-  *lastSlash = '\0'; // Split the string into parent path and new directory
-                     // name; <parent path>\0<direcotry name>
-  char *newFilename =
-      lastSlash + 1;          //\0<direcotry name>, get from <direcotry name>
-  char *ParentPath = pathdup; // pathdup are separated by pathdup, so it take
-                              // <parent path> only
-  // fprintf(stderr,"[%s ,%d] ParentPath:%s, strlen=%d\n",__func__,__LINE__,
-  // ParentPath, strlen(ParentPath));
-  FileNode *parent_filenode = strlen(ParentPath)
-                                  ? fischl_load_entry(root_node, ParentPath)
-                                  : root_node->self_info;
+    *lastSlash = '\0'; // Split the string into parent path and new directory name; <parent path>\0<direcotry name>
+    char *newFilename = lastSlash+1; //\0<direcotry name>, get from <direcotry name>
+    char *ParentPath = pathdup;//pathdup are separated by pathdup, so it take <parent path> only
+    // fprintf(stderr,"[%s ,%d] ParentPath:%s, strlen=%d\n",__func__,__LINE__, ParentPath, strlen(ParentPath));
+    FileNode *parent_filenode = strlen(ParentPath)? fischl_load_entry(root_node, ParentPath): root_node->self_info;
     if (parent_filenode == NULL) {
-    fprintf(stderr, "[%s ,%d] ParentPath:{%s} not found\n", __func__, __LINE__,
-            ParentPath);
+        fprintf(stderr,"[%s ,%d] ParentPath:{%s} not found\n",__func__,__LINE__, ParentPath);
         free(pathdup);
         return -1;
     }
@@ -361,36 +344,26 @@ int FilesOperation::fischl_mknod(const char *path, mode_t mode, dev_t dev) {
     }
     //make new inode
     INode_Data* ret = create_new_inode(parent_inode_number, newFilename, mode);
-  if (ret == NULL)
-    return -1; // ENOSPC but create_new_inode handle ENAMETOOLONG EEXIST
+    if (ret == NULL) return -1;//ENOSPC but create_new_inode handle ENAMETOOLONG EEXIST
     //make new node
-  fischl_add_entry(parent_filenode->subdirectory, ret->inode_num, newFilename,
-                   ret);
+    fischl_add_entry(parent_filenode->subdirectory, ret->inode_num, newFilename, ret);
     free(pathdup);
     return 0;//SUCESS
 }
 /*
     regular file
 */
-int FilesOperation::fischl_create(const char *path, mode_t mode,
-                                  struct fuse_file_info *fi) {
+int FilesOperation::fischl_create(const char* path, mode_t mode, struct fuse_file_info* fi) {
     //check path
     char *pathdup = strdup(path);
     char *lastSlash = strrchr(pathdup, '/');
-  *lastSlash = '\0'; // Split the string into parent path and new directory
-                     // name; <parent path>\0<direcotry name>
-  char *newFilename =
-      lastSlash + 1;          //\0<direcotry name>, get from <direcotry name>
-  char *ParentPath = pathdup; // pathdup are separated by pathdup, so it take
-                              // <parent path> only
-  // fprintf(stderr,"[%s ,%d] ParentPath:%s, strlen=%d\n",__func__,__LINE__,
-  // ParentPath, strlen(ParentPath));
-  FileNode *parent_filenode = strlen(ParentPath)
-                                  ? fischl_load_entry(root_node, ParentPath)
-                                  : root_node->self_info;
+    *lastSlash = '\0'; // Split the string into parent path and new directory name; <parent path>\0<direcotry name>
+    char *newFilename = lastSlash+1; //\0<direcotry name>, get from <direcotry name>
+    char *ParentPath = pathdup;//pathdup are separated by pathdup, so it take <parent path> only
+    // fprintf(stderr,"[%s ,%d] ParentPath:%s, strlen=%d\n",__func__,__LINE__, ParentPath, strlen(ParentPath));
+    FileNode *parent_filenode = strlen(ParentPath)? fischl_load_entry(root_node, ParentPath): root_node->self_info;
     if (parent_filenode == NULL) {
-    fprintf(stderr, "[%s ,%d] ParentPath:{%s} not found\n", __func__, __LINE__,
-            ParentPath);
+        fprintf(stderr,"[%s ,%d] ParentPath:{%s} not found\n",__func__,__LINE__, ParentPath);
         free(pathdup);
         return -1;
     }
@@ -400,14 +373,11 @@ int FilesOperation::fischl_create(const char *path, mode_t mode,
     }
     //make new inode
     INode_Data* ret = create_new_inode(parent_inode_number, newFilename, mode);
-  if (ret == NULL)
-    return -1; // ENOSPC but create_new_inode handle ENAMETOOLONG EEXIST
+    if (ret == NULL) return -1;//ENOSPC but create_new_inode handle ENAMETOOLONG EEXIST
     //make new node in RAM
-  fischl_add_entry(parent_filenode->subdirectory, ret->inode_num, newFilename,
-                   ret);
+    fischl_add_entry(parent_filenode->subdirectory, ret->inode_num, newFilename, ret);
     //directly give inode number rather than create file descriptor table
-  fi->fh =
-      ret->inode_num; // assign file descriptor as inode number to fuse system
+    fi->fh = ret->inode_num;//assign file descriptor as inode number to fuse system
     free(pathdup);
     return 0;//SUCESS
 }
@@ -436,8 +406,7 @@ int FilesOperation::fischl_getattr(const char *path, struct stat *stbuf,
         stbuf->st_uid = inode.metadata.uid;
         stbuf->st_gid = inode.metadata.gid;
         stbuf->st_atime = (time_t)(inode.metadata.access_time / 1000000000ULL);
-    stbuf->st_mtime =
-        (time_t)(inode.metadata.modification_time / 1000000000ULL);
+        stbuf->st_mtime = (time_t)(inode.metadata.modification_time / 1000000000ULL);
         stbuf->st_size = IO_BLOCK_SIZE;
         stbuf->st_ino = inode.inode_num;
 	} else if(S_ISLNK(inode.metadata.permissions)){
@@ -446,8 +415,7 @@ int FilesOperation::fischl_getattr(const char *path, struct stat *stbuf,
         stbuf->st_uid = inode.metadata.uid;
         stbuf->st_gid = inode.metadata.gid;
         stbuf->st_atime = (time_t)(inode.metadata.access_time / 1000000000ULL);
-    stbuf->st_mtime =
-        (time_t)(inode.metadata.modification_time / 1000000000ULL);
+        stbuf->st_mtime = (time_t)(inode.metadata.modification_time / 1000000000ULL);
         stbuf->st_size = inode.metadata.size;
         stbuf->st_ino = inode.inode_num;
     } else {
@@ -455,12 +423,8 @@ int FilesOperation::fischl_getattr(const char *path, struct stat *stbuf,
 		stbuf->st_nlink = inode.metadata.reference_count;
         stbuf->st_uid = inode.metadata.uid;
         stbuf->st_gid = inode.metadata.gid;
-    // printf("GETATTR %llu %llu %llu %o\n", inode.inode_num,
-    // inode.metadata.uid, inode.metadata.gid,
-    // (mode_t)inode.metadata.permissions);
         stbuf->st_atime = (time_t)(inode.metadata.access_time / 1000000000ULL);
-    stbuf->st_mtime =
-        (time_t)(inode.metadata.modification_time / 1000000000ULL);
+        stbuf->st_mtime = (time_t)(inode.metadata.modification_time / 1000000000ULL);
 		stbuf->st_size = inode.metadata.size;
         stbuf->st_ino = inode.inode_num;
 	}
@@ -501,8 +465,7 @@ int FilesOperation::fischl_readdir(const char *path, void *buf,
   return 0;
 }
 
-int FilesOperation::fischl_releasedir(const char *path,
-                                      struct fuse_file_info *fi) {
+int FilesOperation::fischl_releasedir(const char *path, struct fuse_file_info *fi){
     if(fischl_load_entry(root_node, path) == NULL)
         return -ENOENT;
     //do with file descriptor that cannot be used
@@ -514,8 +477,7 @@ void FilesOperation::unlink_inode(u_int64_t inode_number) {
   INode_Data inode;
   inode.inode_num = inode_number;
   fs->inode_manager->load_inode(&inode);
-  if (inode.metadata.reference_count > 1 &&
-      (inode.metadata.permissions & S_IFMT) != S_IFDIR) {
+    if (inode.metadata.reference_count > 1 && (inode.metadata.permissions & S_IFMT) != S_IFDIR){
         inode.metadata.reference_count -= 1;
         fs->inode_manager->save_inode(&inode);
         return;
@@ -538,8 +500,7 @@ void FilesOperation::unlink_inode(u_int64_t inode_number) {
   fs->inode_manager->free_inode(&inode);
 }
 
-int FilesOperation::fischl_opendir(const char *path,
-                                   struct fuse_file_info *fi) {
+int FilesOperation::fischl_opendir(const char* path, struct fuse_file_info* fi) {
 
     u_int64_t fh = namei(path);
 
@@ -585,8 +546,7 @@ int FilesOperation::fischl_rmdir(const char *path) {
         return -EACCES;
     }
     char rw_buffer[IO_BLOCK_SIZE] = {0};
-  for (u_int64_t idx = 0; idx < parent_INode.metadata.size / IO_BLOCK_SIZE;
-       idx++) {
+    for (u_int64_t idx=0; idx<parent_INode.metadata.size/IO_BLOCK_SIZE; idx++) {
         fs->read(&parent_INode, rw_buffer, IO_BLOCK_SIZE, idx*IO_BLOCK_SIZE);
         DirectoryEntry ent;
         for(int i=0;i<=IO_BLOCK_SIZE-264;i+=264){
@@ -650,16 +610,13 @@ int FilesOperation::fischl_chown(const char *path, uid_t uid, gid_t gid,
   INode_Data inode;
   inode.inode_num = fh;
   fs->inode_manager->load_inode(&inode);
-  if (uid != (uid_t)(-1)) {
   inode.metadata.uid = uid;
-  }
-  if (gid != (gid_t)(-1)) {
   inode.metadata.gid = gid;
-  }
   fs->inode_manager->save_inode(&inode);
   return 0;
 }
 
+
 int FilesOperation::fischl_unlink(const char* path) {
     
     char *pathdup = strdup(path);
@@ -688,8 +645,7 @@ int FilesOperation::fischl_unlink(const char *path) {
         return -EACCES;
     }
     char rw_buffer[IO_BLOCK_SIZE] = {0};
-  for (u_int64_t idx = 0; idx < parent_INode.metadata.size / IO_BLOCK_SIZE;
-       idx++) {
+    for (u_int64_t idx=0; idx<parent_INode.metadata.size/IO_BLOCK_SIZE; idx++) {
         fs->read(&parent_INode, rw_buffer, IO_BLOCK_SIZE, idx*IO_BLOCK_SIZE);
         DirectoryEntry ent;
         for(int i=0;i<=IO_BLOCK_SIZE-264;i+=264){
@@ -726,8 +682,8 @@ int FilesOperation::fischl_unlink(const char *path) {
 }
 
 int FilesOperation::fischl_open(const char *path, struct fuse_file_info *fi){
-  /*Creation (O_CREAT, O_EXCL, O_NOCTTY) flags will be filtered out / handled by
-   the kernel. if no files will use create function
+    /*Creation (O_CREAT, O_EXCL, O_NOCTTY) flags will be filtered out / handled by the kernel. 
+     if no files will use create function
     */
     FileNode *get_file;
     if((get_file = fischl_load_entry(root_node, path)) == NULL)
@@ -754,16 +710,15 @@ int FilesOperation::fischl_open(const char *path, struct fuse_file_info *fi) {
         }
     }
 
-  // if need to do with flag fi->flags ((fi->flags & O_ACCMODE)). Initial
-  // setting ALL access create function will handle file descriptor fi->fh
+    //if need to do with flag fi->flags ((fi->flags & O_ACCMODE)). Initial setting ALL access
+    //create function will handle file descriptor fi->fh
     fi->fh = get_file->inode_number;
     return 0;//SUCESS
 }
 
-int FilesOperation::fischl_release(const char *path,
-                                   struct fuse_file_info *fi) {
-  /*Creation (O_CREAT, O_EXCL, O_NOCTTY) flags will be filtered out / handled by
-   the kernel. if no files will use create function
+int FilesOperation::fischl_release(const char *path, struct fuse_file_info *fi){
+    /*Creation (O_CREAT, O_EXCL, O_NOCTTY) flags will be filtered out / handled by the kernel. 
+     if no files will use create function
     */
     FileNode *get_file;
     if((get_file = fischl_load_entry(root_node, path)) == NULL)
@@ -773,8 +728,7 @@ int FilesOperation::fischl_release(const char *path,
     return 0;//SUCESS
 }
 
-int FilesOperation::fischl_write(const char *path, const char *buf, size_t size,
-                                 off_t offset, struct fuse_file_info *fi) {
+int FilesOperation::fischl_write(const char *path, const char *buf, size_t size, off_t offset, struct fuse_file_info *fi){
     /** Write data to an open file
 	 *
 	 * Write should return exactly the number of bytes requested
@@ -788,17 +742,14 @@ int FilesOperation::fischl_write(const char *path, const char *buf, size_t size,
     // FileNode *get_file;
     // if((get_file = fischl_load_entry(root_node, path)) == NULL)
     //     return -ENOENT;
-  // Caution! this based on content in file are multiple of IO_BLOCK_SIZE, not
-  // the exact write size. based on current write_datablock API implement, when
-  // write_datablock pass with actual size not index this function should be
-  // fixed
+    // Caution! this based on content in file are multiple of IO_BLOCK_SIZE, not the exact write size.
+    // based on current write_datablock API implement, when write_datablock pass with actual size not index this function should be fixed
     
     INode_Data inode;
     // Assuming inode is correctly initialized here based on 'path'
     inode.inode_num = fi->fh;
     fs->inode_manager->load_inode(&inode);
-  // size_t len = (inode.metadata.size/IO_BLOCK_SIZE) * IO_BLOCK_SIZE;  //
-  // Assuming each block is 4096 bytes
+    //size_t len = (inode.metadata.size/IO_BLOCK_SIZE) * IO_BLOCK_SIZE;  // Assuming each block is 4096 bytes
     // Determine the length of the buffer
     // Allocate memory for the new buffer
     char* buffer = (char*)malloc(size);
@@ -808,19 +759,16 @@ int FilesOperation::fischl_write(const char *path, const char *buf, size_t size,
     size_t block_offset = offset % IO_BLOCK_SIZE; // Offset within the first block
     while (bytes_write < size) {
         char block_buffer[IO_BLOCK_SIZE];  // Temporary buffer for each block
-      size_t copy_size = std::min(size - bytes_write, IO_BLOCK_SIZE -
-  block_offset); memcpy(block_buffer + block_offset, buf + bytes_write,
-  copy_size); fs->write(&inode, block_buffer, IO_BLOCK_SIZE,
-  block_index*IO_BLOCK_SIZE);
-      // fprintf(stderr,"[%s ,%d] inode.size %d, block_index %d, block_buffer
-  %s\n",__func__,__LINE__, inode.size, block_index, block_buffer); bytes_write
-  += copy_size; block_index++; block_offset = 0;  // Only the first block might
-  have a non-zero offset
+        size_t copy_size = std::min(size - bytes_write, IO_BLOCK_SIZE - block_offset);
+        memcpy(block_buffer + block_offset, buf + bytes_write, copy_size);
+        fs->write(&inode, block_buffer, IO_BLOCK_SIZE, block_index*IO_BLOCK_SIZE);
+        // fprintf(stderr,"[%s ,%d] inode.size %d, block_index %d, block_buffer %s\n",__func__,__LINE__, inode.size, block_index, block_buffer);
+        bytes_write += copy_size;
+        block_index++;
+        block_offset = 0;  // Only the first block might have a non-zero offset
     }*/
     fs->inode_manager->save_inode(&inode);
     free(buffer);
-  if (bytes_write < 0)
-    return -errno;
     return bytes_write;  // Return the actual number of bytes read
 }
 
@@ -857,20 +805,13 @@ int FilesOperation::fischl_symlink(const char *to, const char *from) {
     //printf("SYMLINK %s %s\n", from, to);
     char *pathdup = strdup(from);
     char *lastSlash = strrchr(pathdup, '/');
-  *lastSlash = '\0'; // Split the string into parent path and new directory
-                     // name; <parent path>\0<direcotry name>
-  char *newFilename =
-      lastSlash + 1;          //\0<direcotry name>, get from <direcotry name>
-  char *ParentPath = pathdup; // pathdup are separated by pathdup, so it take
-                              // <parent path> only
-  // fprintf(stderr,"[%s ,%d] ParentPath:%s, strlen=%d\n",__func__,__LINE__,
-  // ParentPath, strlen(ParentPath));
-  FileNode *parent_filenode = strlen(ParentPath)
-                                  ? fischl_load_entry(root_node, ParentPath)
-                                  : root_node->self_info;
+    *lastSlash = '\0'; // Split the string into parent path and new directory name; <parent path>\0<direcotry name>
+    char *newFilename = lastSlash+1; //\0<direcotry name>, get from <direcotry name>
+    char *ParentPath = pathdup;//pathdup are separated by pathdup, so it take <parent path> only
+    // fprintf(stderr,"[%s ,%d] ParentPath:%s, strlen=%d\n",__func__,__LINE__, ParentPath, strlen(ParentPath));
+    FileNode *parent_filenode = strlen(ParentPath)? fischl_load_entry(root_node, ParentPath): root_node->self_info;
     if (parent_filenode == NULL) {
-    fprintf(stderr, "[%s ,%d] ParentPath:{%s} not found\n", __func__, __LINE__,
-            ParentPath);
+        fprintf(stderr,"[%s ,%d] ParentPath:{%s} not found\n",__func__,__LINE__, ParentPath);
         free(pathdup);
         return -ENOENT;
     }
@@ -879,13 +820,10 @@ int FilesOperation::fischl_symlink(const char *to, const char *from) {
         return -EACCES;
     }
     //make new inode
-  INode_Data *ret =
-      create_new_inode(parent_inode_number, newFilename, S_IFLNK | 0777);
-  if (ret == NULL)
-    return -1; // ENOSPC but create_new_inode handle ENAMETOOLONG EEXIST
+    INode_Data* ret = create_new_inode(parent_inode_number, newFilename, S_IFLNK|0777);
+    if (ret == NULL) return -1;//ENOSPC but create_new_inode handle ENAMETOOLONG EEXIST
     //make new node in RAM
-  fischl_add_entry(parent_filenode->subdirectory, ret->inode_num, newFilename,
-                   ret);
+    fischl_add_entry(parent_filenode->subdirectory, ret->inode_num, newFilename, ret);
     size_t size = strlen(to);
     char* buffer = (char*)malloc(size);
     memcpy(buffer, to, size);
@@ -898,9 +836,7 @@ int FilesOperation::fischl_symlink(const char *to, const char *from) {
     return 0;//SUCESS
 }
 
-int FilesOperation::insert_inode_to(u_int64_t parent_inode_number,
-                                    const char *name, INode_Data *new_inode,
-                                    bool check_replace) {
+int FilesOperation::insert_inode_to(u_int64_t parent_inode_number, const char* name, INode_Data *new_inode, bool check_replace) {
     // trys to create a file under parent directory
     if (strlen(name)>=256) {
         perror("Name too long, cannot create file or directory");
@@ -910,8 +846,7 @@ int FilesOperation::insert_inode_to(u_int64_t parent_inode_number,
     inode.inode_num = parent_inode_number;
     fs->inode_manager->load_inode(&inode);
     if ((inode.metadata.permissions & S_IFMT) != S_IFDIR) {
-    fprintf(stderr, "[%s ,%d] please create under directory\n", __func__,
-            __LINE__);
+        fprintf(stderr,"[%s ,%d] please create under directory\n",__func__,__LINE__);
         return -1;
     }
 
@@ -925,15 +860,13 @@ int FilesOperation::insert_inode_to(u_int64_t parent_inode_number,
             if (strcmp(ent.file_name, name)==0 && ent.inode_number != 0) {
                 if(check_replace){
                     if((new_inode->metadata.permissions & S_IFMT) == S_IFDIR){
-            fprintf(stderr, "[%s ,%d] %s/ already exists\n", __func__, __LINE__,
-                    name);
+                        fprintf(stderr,"[%s ,%d] %s/ already exists\n",__func__,__LINE__, name);
                     }else{
-            fprintf(stderr, "[%s ,%d] %s already exists\n", __func__, __LINE__,
-                    name);
+                        fprintf(stderr,"[%s ,%d] %s already exists\n",__func__,__LINE__, name);
                     }                  
                     return -1;
-        } else {
-          // printf("RENAME HAPPENS %s %s\n", );
+                }
+                else{
                     ent.inode_number = new_inode->inode_num;
                     ent.serialize(r_buffer+i);
                     fs->write(&inode, r_buffer, IO_BLOCK_SIZE, idx*IO_BLOCK_SIZE);
@@ -991,20 +924,13 @@ int FilesOperation::fischl_link(const char *from, const char *to) {
     //check path
     char *pathdup = strdup(to);
     char *lastSlash = strrchr(pathdup, '/');
-  *lastSlash = '\0'; // Split the string into parent path and new directory
-                     // name; <parent path>\0<direcotry name>
-  char *newFilename =
-      lastSlash + 1;          //\0<direcotry name>, get from <direcotry name>
-  char *ParentPath = pathdup; // pathdup are separated by pathdup, so it take
-                              // <parent path> only
-  // fprintf(stderr,"[%s ,%d] ParentPath:%s, strlen=%d\n",__func__,__LINE__,
-  // ParentPath, strlen(ParentPath));
-  FileNode *parent_filenode = strlen(ParentPath)
-                                  ? fischl_load_entry(root_node, ParentPath)
-                                  : root_node->self_info;
+    *lastSlash = '\0'; // Split the string into parent path and new directory name; <parent path>\0<direcotry name>
+    char *newFilename = lastSlash+1; //\0<direcotry name>, get from <direcotry name>
+    char *ParentPath = pathdup;//pathdup are separated by pathdup, so it take <parent path> only
+    // fprintf(stderr,"[%s ,%d] ParentPath:%s, strlen=%d\n",__func__,__LINE__, ParentPath, strlen(ParentPath));
+    FileNode *parent_filenode = strlen(ParentPath)? fischl_load_entry(root_node, ParentPath): root_node->self_info;
     if (parent_filenode == NULL) {
-    fprintf(stderr, "[%s ,%d] ParentPath:{%s} not found\n", __func__, __LINE__,
-            ParentPath);
+        fprintf(stderr,"[%s ,%d] ParentPath:{%s} not found\n",__func__,__LINE__, ParentPath);
         free(pathdup);
         return -1;
     }
@@ -1019,15 +945,14 @@ int FilesOperation::fischl_link(const char *from, const char *to) {
 
     ret.metadata.reference_count += 1;
     fs->inode_manager->save_inode(&ret);
-  fischl_add_entry(parent_filenode->subdirectory, ret.inode_num, newFilename,
-                   &ret);
+    fischl_add_entry(parent_filenode->subdirectory, ret.inode_num, newFilename, &ret);
     free(pathdup);
     return 0;
 }
 
+
 // TODO: rename dir and rename fail
-int FilesOperation::fischl_rename(const char *old_path, const char *new_path,
-                                  unsigned int flags) {
+int FilesOperation::fischl_rename(const char *old_path, const char *new_path, unsigned int flags){
     //find old path
     char *pathdup = strdup(old_path);
     char *lastSlash = strrchr(pathdup, '/');
@@ -1043,14 +968,10 @@ int FilesOperation::fischl_rename(const char *old_path, const char *new_path,
     rename_info.exchangeExist = false;
     rename_info.oldParentNode = fischl_load_entry(root_node, oldParentPath);
     //if path end with / means to rename directory
-  rename_info.oldFileNode =
-      strlen(filename)
-          ? fischl_load_entry(rename_info.oldParentNode->subdirectory, filename)
-          : rename_info.oldParentNode;
+    rename_info.oldFileNode   = strlen(filename)? fischl_load_entry(rename_info.oldParentNode->subdirectory, filename):rename_info.oldParentNode;
 
     if (rename_info.oldFileNode == NULL) {
-    fprintf(stderr, "[%s ,%d] path %s not found by fischl_load_entry\n",
-            __func__, __LINE__, old_path);
+        fprintf(stderr,"[%s ,%d] path %s not found by fischl_load_entry\n",__func__,__LINE__, old_path);
         free(pathdup);
         return -ENOENT;
     }
@@ -1058,33 +979,23 @@ int FilesOperation::fischl_rename(const char *old_path, const char *new_path,
     //find new path
     char *new_pathdup = strdup(new_path);
     lastSlash = strrchr(new_pathdup, '/');
-  *lastSlash = '\0'; // Split the string into parent path and new directory
-                     // name; <parent path>\0<direcotry name>
-  char *newParentPath = new_pathdup; // pathdup are separated by pathdup, so it
-                                     // take <parent path> only
+    *lastSlash = '\0'; // Split the string into parent path and new directory name; <parent path>\0<direcotry name>
+    char *newParentPath = new_pathdup;//pathdup are separated by pathdup, so it take <parent path> only
     //put new path info in rename struct
-  rename_info.newName =
-      lastSlash + 1; //\0<direcotry name>, get from <direcotry name>
+    rename_info.newName       = lastSlash+1; //\0<direcotry name>, get from <direcotry name>
     rename_info.newFileNode   = fischl_load_entry(root_node, new_path);
-  rename_info.newParentNode = strlen(newParentPath)
-                                  ? fischl_load_entry(root_node, newParentPath)
-                                  : root_node->self_info;
+    rename_info.newParentNode = strlen(newParentPath)? fischl_load_entry(root_node, newParentPath): root_node->self_info;
     
-  if (!permission_check_by_inode_num(W_OK,
-                                     rename_info.oldParentNode->inode_number)) {
+    if(!permission_check_by_inode_num(W_OK, rename_info.oldParentNode->inode_number)){
         return -EACCES;
     }
-  if (!permission_check_by_inode_num(W_OK,
-                                     rename_info.newParentNode->inode_number)) {
+    if(!permission_check_by_inode_num(W_OK, rename_info.newParentNode->inode_number)){
         return -EACCES;
     }
-  if (!permission_check_by_inode_num(W_OK,
-                                     rename_info.oldFileNode->inode_number)) {
+    if(!permission_check_by_inode_num(W_OK, rename_info.oldFileNode->inode_number)){
         return -EACCES;
     }
-  if (rename_info.newFileNode != NULL &&
-      !permission_check_by_inode_num(W_OK,
-                                     rename_info.newFileNode->inode_number)) {
+    if(rename_info.newFileNode != NULL && !permission_check_by_inode_num(W_OK, rename_info.newFileNode->inode_number)){
         return -EACCES;
     }
 
@@ -1092,8 +1003,7 @@ int FilesOperation::fischl_rename(const char *old_path, const char *new_path,
     if (flags & RENAME_NOREPLACE) {
         // Check if newpath exists and return error if it does
         if(rename_info.newFileNode != NULL){
-      fprintf(stderr, "[%s ,%d] newpath has already existed\n", __func__,
-              __LINE__);
+            fprintf(stderr,"[%s ,%d] newpath has already existed\n",__func__,__LINE__);
             free(new_pathdup);//new path
             free(pathdup);//old path
             return -1;
@@ -1103,8 +1013,7 @@ int FilesOperation::fischl_rename(const char *old_path, const char *new_path,
     if (flags & RENAME_EXCHANGE) {
         // Ensure both oldpath and newpath exist and exchange them atomically
         if(rename_info.newFileNode == NULL){
-      fprintf(stderr, "[%s ,%d] newpath does not exist cannot exchange\n",
-              __func__, __LINE__);
+            fprintf(stderr,"[%s ,%d] newpath does not exist cannot exchange\n",__func__,__LINE__);
             free(new_pathdup);
             free(pathdup);
             return -1;
@@ -1117,8 +1026,7 @@ int FilesOperation::fischl_rename(const char *old_path, const char *new_path,
         
         bool change_flag = false;
         //delete record on old path
-    for (u_int64_t idx = 0; idx < parent_INode.metadata.size / IO_BLOCK_SIZE;
-         idx++) {
+        for (u_int64_t idx=0; idx<parent_INode.metadata.size/IO_BLOCK_SIZE; idx++) {
             fs->read(&parent_INode, rw_buffer, IO_BLOCK_SIZE, idx*IO_BLOCK_SIZE);
             DirectoryEntry ent;
             for(int i=0;i<=IO_BLOCK_SIZE-264;i+=264){
@@ -1142,16 +1050,14 @@ int FilesOperation::fischl_rename(const char *old_path, const char *new_path,
         
         change_flag = false;
         //delete record on old path
-    for (u_int64_t idx = 0; idx < parent_INode.metadata.size / IO_BLOCK_SIZE;
-         idx++) {
+        for (u_int64_t idx=0; idx<parent_INode.metadata.size/IO_BLOCK_SIZE; idx++) {
             fs->read(&parent_INode, rw_buffer, IO_BLOCK_SIZE, idx*IO_BLOCK_SIZE);
             DirectoryEntry ent;
             for(int i=0;i<=IO_BLOCK_SIZE-264;i+=264){
                 ent.deserialize(rw_buffer+i);
                 if (ent.inode_number == rename_info.oldFileNode->inode_number) {
                     change_flag = true;//should be change
-          strncpy(ent.file_name, rename_info.newName,
-                  sizeof(ent.file_name) - 1);
+                    strncpy(ent.file_name, rename_info.newName, sizeof(ent.file_name) - 1);
                     ent.file_name[sizeof(ent.file_name) - 1] = '\0'; 
                     ent.serialize(rw_buffer+i);
                     break;
@@ -1163,10 +1069,8 @@ int FilesOperation::fischl_rename(const char *old_path, const char *new_path,
                 break;
             }
         }
-    unlink_inode(rename_info.oldFileNode->inode_number);
         fischl_rm_entry(rename_info.oldParentNode->subdirectory, filename);
-    fischl_rm_entry(rename_info.newParentNode->subdirectory,
-                    rename_info.newName);
+        fischl_rm_entry(rename_info.newParentNode->subdirectory, rename_info.newName);
         return 0;
     }
 
@@ -1174,6 +1078,7 @@ int FilesOperation::fischl_rename(const char *old_path, const char *new_path,
     // Hard Disk rename
     if(rename_info.oldFileNode->subdirectory != NULL){//secure its directory
         //remove its record from subdirectory; find .. from subdirectory
+
     }
     // remove its record from parent
     INode_Data parent_INode;
@@ -1185,14 +1090,12 @@ int FilesOperation::fischl_rename(const char *old_path, const char *new_path,
     INode_Data ret;
     ret.inode_num = rename_info.oldFileNode->inode_number;
     fs->inode_manager->load_inode(&ret);
-  if (insert_inode_to(rename_info.newParentNode->inode_number,
-                      rename_info.newName, &ret, false) < 0) {
+    if(insert_inode_to(rename_info.newParentNode->inode_number, rename_info.newName, &ret, false)<0){
         return -1;
     }
     bool change_flag = false;
     //delete record on old path
-  for (u_int64_t idx = 0; idx < parent_INode.metadata.size / IO_BLOCK_SIZE;
-       idx++) {
+    for (u_int64_t idx=0; idx<parent_INode.metadata.size/IO_BLOCK_SIZE; idx++) {
         fs->read(&parent_INode, rw_buffer, IO_BLOCK_SIZE, idx*IO_BLOCK_SIZE);
         DirectoryEntry ent;
         for(int i=0;i<=IO_BLOCK_SIZE-264;i+=264){
@@ -1211,10 +1114,6 @@ int FilesOperation::fischl_rename(const char *old_path, const char *new_path,
             break;
         }
     }
-  if (rename_info.newParentNode != NULL) {
-    fischl_rm_entry(rename_info.newParentNode->subdirectory,
-                    rename_info.newName);
-  }
     fischl_rm_entry(rename_info.oldParentNode->subdirectory, filename);
     
     //free path
@@ -1241,8 +1140,6 @@ int FilesOperation::fischl_truncate(const char *path, off_t offset,
     }
     res = fs->truncate(&inode, offset);
     fs->inode_manager->save_inode(&inode);
-  if (res < 0)
-    return -errno;
     return res;
 }
 
@@ -1265,8 +1162,7 @@ int FilesOperation::fischl_read(const char *path, char *buf, size_t size,
   // Assuming inode is correctly initialized here based on 'path'
   inode.inode_num = fi->fh;
   fs->inode_manager->load_inode(&inode);
-  // printf("OUT READ %llu %llu %llu\n", inode.inode_num,
-  // inode.single_indirect_block, inode.double_indirect_block);
+  //printf("OUT READ %llu %llu %llu\n", inode.inode_num, inode.single_indirect_block, inode.double_indirect_block);
   ssize_t bytes_read = fs->read(&inode, buf, size, offset);
   //printf("BYTES_READ %d\n",int(bytes_read));
   //for (int i = 0; i < bytes_read; i++)printf("%x", buf[i]&0xff);
@@ -1294,15 +1190,10 @@ int FilesOperation::fischl_read(const char *path, char *buf, size_t size,
   buf, block_buffer); bytes_read += copy_size; block_index++; block_offset = 0;
   // Only the first block might have a non-zero offset
   }*/
-
-  if (bytes_read < 0)
-    return -errno;
   return bytes_read; // Return the actual number of bytes read
 }
 
-int FilesOperation::fischl_utimens(const char *path,
-                                   const struct timespec tv[2],
-                                   struct fuse_file_info *fi) {
+int FilesOperation::fischl_utimens(const char *path, const struct timespec tv[2], struct fuse_file_info *fi){
     (void) fi;
 	int res = 0;
     u_int64_t fh = namei(path);
@@ -1314,10 +1205,8 @@ int FilesOperation::fischl_utimens(const char *path,
     INode_Data inode;
     inode.inode_num = fh;
     fs->inode_manager->load_inode(&inode);
-  inode.metadata.access_time =
-      (u_int64_t)tv[0].tv_sec * 1000000000ULL + tv[0].tv_nsec;
-  inode.metadata.modification_time =
-      (u_int64_t)tv[1].tv_sec * 1000000000ULL + tv[1].tv_nsec;
+    inode.metadata.access_time = (u_int64_t)tv[0].tv_sec * 1000000000ULL + tv[0].tv_nsec;
+    inode.metadata.modification_time = (u_int64_t)tv[1].tv_sec * 1000000000ULL + tv[1].tv_nsec;
     fs->inode_manager->save_inode(&inode);
     return 0;
 }

lib/fischl.cpp

@@ -35,7 +35,6 @@ static const struct fuse_opt option_spec[] = {
 
 void* fischl_init(struct fuse_conn_info *conn, struct fuse_config *cfg) {
     cfg->use_ino = 1;
-    conn->want &= ~FUSE_CAP_ATOMIC_O_TRUNC;
     options.fsop->initialize(options.load);
 }
 

lib/fs/datablock_manager.cpp

@@ -52,10 +52,8 @@ int DataBlock_Manager_Bitmap::new_datablock(u_int64_t *block_num) {
   char zero_buf[IO_BLOCK_SIZE] = {0};
 
   if (bitmap_block_num < block_segment_start ||
-      bitmap_block_num >= block_segment_end) {
-    perror("Error with new_datablock freelist head\n");
+      bitmap_block_num >= block_segment_end)
     return -1;
-  }
 
   if ((err = fs->disk->read_block(bitmap_block_num, bitmap.buf)) < 0)
     return err;
@@ -66,10 +64,8 @@ int DataBlock_Manager_Bitmap::new_datablock(u_int64_t *block_num) {
 
   u_int64_t relative_block_num = bitmap.claim_relative_block();
 
-  if (relative_block_num == 0) {
-    errno = ENOSPC;
+  if (relative_block_num == 0)
     return -1;
-  }
 
   u_int64_t block_num_ = relative_block_num + bitmap_block_num;
 

lib/fs/fs_file_io.cpp

@@ -31,8 +31,7 @@ int Fs::sweep_inode_datablocks(INode_Data *inode_data,
                                DatablockOperation *op) {
   int result;
 
-  // printf("SWEEP %llu %llu %llu\n", inode_data->inode_num,
-  // inode_data->single_indirect_block, inode_data->double_indirect_block);
+  //printf("SWEEP %llu %llu %llu\n", inode_data->inode_num, inode_data->single_indirect_block, inode_data->double_indirect_block);
 
   u_int64_t start_index = start_block_index;
   for (size_t i = start_index; i < NUMBER_OF_DIRECT_BLOCKS; ++i) {
@@ -97,8 +96,7 @@ int Fs::sweep_datablocks(u_int64_t *block_num, int indirect_num,
     }
   }
 
-  // if((*block_num)>30000000000000LL)printf("DIES 1 %llu %d %llu\n",
-  // *block_num, indirect_num, start_block_index);
+  //if((*block_num)>30000000000000LL)printf("DIES 1 %llu %d %llu\n", *block_num, indirect_num, start_block_index);
 
   if (indirect_num == 0) {
     bool delete_block = false;
@@ -177,8 +175,7 @@ public:
         std::min(IO_BLOCK_SIZE - offset, count - bytes_completed);
 
     if (block_num != 0) {
-      if ((block_num) > 3000000000000LL)
-        printf("DIES 2\n");
+      if((block_num)>3000000000000LL)printf("DIES 2\n");
       if ((err = fs->disk->read_block(block_num, datablock_buf)) < 0)
         return err;
 
@@ -208,8 +205,7 @@ public:
         std::min(IO_BLOCK_SIZE - offset, count - bytes_completed);
 
     if (write_size < IO_BLOCK_SIZE){
-      if ((block_num) > 3000000000000LL)
-        printf("DIES 3\n");
+      if((block_num)>3000000000000LL)printf("DIES 3\n");
       if ((err = fs->disk->read_block(block_num, datablock_buf)) < 0)
         return err;
     }
@@ -239,8 +235,7 @@ public:
       (*delete_block) = true;
       return 1;
     }
-    if ((block_num) > 3000000000000LL)
-      printf("DIES 4\n");
+  if((block_num)>3000000000000LL)printf("DIES 4\n");
     if ((err = fs->disk->read_block(block_num, datablock_buf)) < 0)
       return err;
 
@@ -294,10 +289,9 @@ ssize_t Fs::read(INode_Data *inode_data, char buf[], size_t count,
   op.bytes_completed = 0;
   op.fs = this;
 
-  // printf("IN READ %llu %llu %llu\n", inode_data->inode_num,
-  // inode_data->single_indirect_block, inode_data->double_indirect_block);
+  //printf("IN READ %llu %llu %llu\n", inode_data->inode_num, inode_data->single_indirect_block, inode_data->double_indirect_block);
   if ((err = sweep_inode_datablocks(inode_data, start_block_index, false,
-                                    &op)) < 0)
+                                    &op)) != 0)
     return err;
 
   return op.bytes_completed;
@@ -307,11 +301,6 @@ ssize_t Fs::write(INode_Data *inode_data, const char buf[], size_t count,
                   size_t offset) {
   int err;
 
-  if (count + offset > FILE_SIZE_MAX) {
-    errno = EFBIG;
-    return -1;
-  }
-
   u_int64_t start_block_index = offset / IO_BLOCK_SIZE;
   size_t internal_offset = offset - (start_block_index * IO_BLOCK_SIZE);
 
@@ -322,8 +311,8 @@ ssize_t Fs::write(INode_Data *inode_data, const char buf[], size_t count,
   op.bytes_completed = 0;
   op.fs = this;
 
-  if ((err = sweep_inode_datablocks(inode_data, start_block_index, true, &op)) <
-      0)
+  if ((err = sweep_inode_datablocks(inode_data, start_block_index, true,
+                                    &op)) != 0)
     return err;
 
   inode_data->metadata.size =
@@ -332,19 +321,9 @@ ssize_t Fs::write(INode_Data *inode_data, const char buf[], size_t count,
   return op.bytes_completed;
 }
 
-int Fs::truncate(INode_Data *inode_data, off_t length) {
+int Fs::truncate(INode_Data *inode_data, size_t length) {
   int err;
 
-  if (length > FILE_SIZE_MAX) {
-    errno = EFBIG;
-    return -1;
-  }
-
-  if (length < 0) {
-    errno = EINVAL;
-    return -1;
-  }
-
   u_int64_t start_block_index = length / IO_BLOCK_SIZE;
   size_t internal_offset = length - (start_block_index * IO_BLOCK_SIZE);
 
@@ -364,10 +343,8 @@ int Fs::truncate(INode_Data *inode_data, off_t length) {
 ssize_t Fs::lseek_next_data(INode_Data *inode_data, size_t offset) {
   int err;
 
-  if (offset >= inode_data->metadata.size) {
-    errno = ENXIO;
+  if (offset >= inode_data->metadata.size)
     return -1;
-  }
 
   u_int64_t start_block_index = offset / IO_BLOCK_SIZE;
   size_t internal_offset = offset - (start_block_index * IO_BLOCK_SIZE);
@@ -382,10 +359,8 @@ ssize_t Fs::lseek_next_data(INode_Data *inode_data, size_t offset) {
                                     &op)) < 0)
     return err;
 
-  if (op.bytes_completed >= inode_data->metadata.size) {
-    errno = ENXIO;
+  if (op.bytes_completed >= inode_data->metadata.size)
     return -1;
-  }
 
   return op.bytes_completed;
 }
@@ -393,10 +368,8 @@ ssize_t Fs::lseek_next_data(INode_Data *inode_data, size_t offset) {
 ssize_t Fs::lseek_next_hole(INode_Data *inode_data, size_t offset) {
   int err;
 
-  if (offset >= inode_data->metadata.size) {
-    errno = ENXIO;
+  if (offset >= inode_data->metadata.size)
     return -1;
-  }
 
   u_int64_t start_block_index = offset / IO_BLOCK_SIZE;
   size_t internal_offset = offset - (start_block_index * IO_BLOCK_SIZE);

lib/rawdisk.cpp

@@ -65,7 +65,6 @@ int RealRawDisk::read_block(u_int64_t block_number, char *buffer) {
   if (lseek(fd, offset, SEEK_SET) == (u_int64_t)-1) {
     printf("LSEEK ERROR %llu %llu\n", block_number, offset);
     perror("Error seeking to offset");
-    errno = EIO;
     return -1;
   }
 
@@ -76,7 +75,6 @@ int RealRawDisk::read_block(u_int64_t block_number, char *buffer) {
   //printf("\n");
   if (bytesRead < IO_BLOCK_SIZE) {
     perror("Error reading from device");
-    errno = EIO;
     return -1;
   }
 
@@ -88,7 +86,6 @@ int RealRawDisk::write_block(u_int64_t block_number, char *buffer) {
 
   if (lseek(fd, offset, SEEK_SET) == (u_int64_t)-1) {
     perror("Error seeking to offset");
-    errno = EIO;
     return -1;
   }
 
@@ -96,7 +93,6 @@ int RealRawDisk::write_block(u_int64_t block_number, char *buffer) {
   ssize_t bytesWritten = write(fd, buffer, IO_BLOCK_SIZE);
   if (bytesWritten < IO_BLOCK_SIZE) {
     perror("Error writing to device");
-    errno = EIO;
     return -1;
   }
 
@@ -122,7 +118,6 @@ int FakeRawDisk::read_block(u_int64_t block_number, char *buffer) {
 
   if (offset + IO_BLOCK_SIZE > diskSize) {
     perror("Error reading past fake disk size");
-    errno = EIO;
     return -1;
   }
 
@@ -136,7 +131,6 @@ int FakeRawDisk::write_block(u_int64_t block_number, char *buffer) {
 
   if (offset + IO_BLOCK_SIZE > diskSize) {
     perror("Error writing past fake disk size");
-    errno = EIO;
     return -1;
   }