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-rw-r--r--ayafs/src/filesystem/mod.rs2
-rw-r--r--ayafs/src/filesystem/trait_impl.rs1247
2 files changed, 0 insertions, 1249 deletions
diff --git a/ayafs/src/filesystem/mod.rs b/ayafs/src/filesystem/mod.rs
deleted file mode 100644
index 1eaa8e8..0000000
--- a/ayafs/src/filesystem/mod.rs
+++ /dev/null
@@ -1,2 +0,0 @@
-/// Where upper filesystem calls are implemented.
-pub mod trait_impl;
diff --git a/ayafs/src/filesystem/trait_impl.rs b/ayafs/src/filesystem/trait_impl.rs
deleted file mode 100644
index 1c40b92..0000000
--- a/ayafs/src/filesystem/trait_impl.rs
+++ /dev/null
@@ -1,1247 +0,0 @@
-use crate::block_device::BLOCK_SIZE;
-use crate::disk::block::DataBlock;
-use crate::disk::inode::InodeMode;
-use crate::utils::permissions::{check_access, clear_suid_sgid, get_groups};
-use crate::utils::{from_filetype, from_systime, time_now, to_fileattr, to_filetype};
-use crate::{AyaFS, TTL};
-use fuser::TimeOrNow::{Now, SpecificTime};
-use fuser::{
- FileType, Filesystem, KernelConfig, ReplyAttr, ReplyData, ReplyDirectory, ReplyEmpty,
- ReplyEntry, ReplyOpen, ReplyWrite, Request, TimeOrNow,
-};
-use libc::{c_int, EACCES, EBADF, EEXIST, EINVAL, EIO, EISDIR, ENAMETOOLONG, ENOENT, ENOSPC, ENOTDIR, ENOTEMPTY, EPERM, IPOPT_OFFSET, O_ACCMODE, O_RDONLY, O_RDWR, O_WRONLY, R_OK, S_ISGID, S_ISUID, S_IXGRP, S_IXOTH, S_IXUSR, W_OK, RENAME_NOREPLACE, RENAME_EXCHANGE};
-use log::debug;
-use std::ffi::OsStr;
-use std::os::unix::ffi::OsStrExt;
-use std::path::Path;
-use std::slice;
-use std::time::SystemTime;
-
-impl AyaFS {}
-
-impl Filesystem for AyaFS {
- fn init(&mut self, _req: &Request<'_>, _config: &mut KernelConfig) -> Result<(), c_int> {
- debug!("`init()");
- Ok(())
- }
-
- fn destroy(&mut self) {
- debug!("destroy()");
- // TODO 写回
- }
-
- fn lookup(&mut self, req: &Request<'_>, parent: u64, name: &OsStr, reply: ReplyEntry) {
- if name.len() > 255 {
- reply.error(ENAMETOOLONG);
- return;
- }
-
- let parent = parent as usize;
- if let Some(parent_inode) = self.get_inode(parent) {
- if check_access(
- req.uid(),
- req.gid(),
- parent_inode.uid,
- parent_inode.gid,
- parent_inode.mode,
- R_OK,
- ) {
- let parent_inode = parent_inode.clone();
- match self.lookup_name(parent, &parent_inode, name) {
- Ok((inode_index, _, inode)) => {
- let attr = to_fileattr(inode_index as usize, &inode);
- reply.entry(&TTL, &attr, 0);
- }
- Err(err_code) => reply.error(err_code),
- };
- } else {
- reply.error(EACCES);
- }
- } else {
- reply.error(ENOENT);
- }
- }
-
- fn getattr(&mut self, _req: &Request<'_>, ino: u64, reply: ReplyAttr) {
- if let Some(inode) = self.get_inode(ino as usize) {
- reply.attr(&TTL, &to_fileattr(ino as usize, inode));
- } else {
- reply.error(ENOENT);
- }
- }
-
- fn setattr(
- &mut self,
- req: &Request<'_>,
- ino: u64,
- mode: Option<u32>,
- uid: Option<u32>,
- gid: Option<u32>,
- size: Option<u64>, // 当 setattr 被 ftruncate invoke 时会设置 size
- atime: Option<TimeOrNow>,
- mtime: Option<TimeOrNow>,
- _ctime: Option<SystemTime>,
- fh: Option<u64>, // 当 setattr 被 ftruncate invoke 时会提供 fh
- _crtime: Option<SystemTime>, // 忽略
- _chgtime: Option<SystemTime>, // 忽略
- _bkuptime: Option<SystemTime>, // 忽略
- _flags: Option<u32>, // 忽略
- reply: ReplyAttr,
- ) {
- if let Some(inode) = self.get_inode_mut(ino as usize) {
- // chmod
- if let Some(mode) = mode {
- debug!("chmod on inode {:#x?} mode {:o}", ino, mode);
- if req.uid() != 0 && req.uid() != inode.uid {
- reply.error(EPERM);
- return;
- } // uid == 0 (root) or uid == inode.uid (user itself)
-
- if req.uid() != 0
- && req.gid() != inode.gid
- && !get_groups(req.pid()).contains(&inode.gid)
- {
- inode.mode = InodeMode((mode & !S_ISGID) as u16);
- } else {
- inode.mode = InodeMode(mode as u16);
- }
-
- inode.ctime = time_now();
- reply.attr(&TTL, &to_fileattr(ino as usize, inode));
- return;
- }
-
- // chown
- if uid.is_some() || gid.is_some() {
- debug!("chown on inode {:#x?} uid {:?} gid {:?}", ino, uid, gid);
- if let Some(uid) = uid {
- // 虽然只有 root 可以 chown 但是 user chown 自己也是不报错的
- if req.uid() != 0 && !(uid == inode.uid && uid == req.uid()) {
- reply.error(EPERM);
- return;
- }
- }
- if let Some(gid) = gid {
- // 只有 root 和 file owner 才可以 chgrp
- if req.uid() != 0 && req.uid() != inode.uid {
- reply.error(EPERM);
- return;
- }
- // root 可以任意 chgrp, 非 root 只能修改到用户自己所在的组里
- if req.gid() != 0 && !get_groups(req.pid()).contains(&gid) {
- reply.error(EPERM);
- return;
- }
- }
-
- // 可执行文件要清除 suid & sgid
- if inode.mode.0 & (S_IXUSR | S_IXGRP | S_IXOTH) as u16 != 0 {
- inode.mode = clear_suid_sgid(inode.mode);
- }
-
- // chown 要清除 suid
- if let Some(uid) = uid {
- inode.uid = uid;
- inode.mode.0 &= !S_ISUID as u16;
- }
-
- if let Some(gid) = gid {
- inode.gid = gid;
- if req.uid() != 0 {
- inode.mode.0 &= !S_ISGID as u16;
- }
- }
- inode.ctime = time_now();
- reply.attr(&TTL, &to_fileattr(ino as usize, inode));
- return;
- }
-
- // ftruncate
- if let Some(size) = size {
- // TODO 当大小减小的时候对应 deallocate 块
- debug!("ftruncate on inode {:#x?} size {:?}", ino, size);
- if let Some(file_handle) = fh {
- let mut inode = inode.clone();
- let (inode_index, _read, write) =
- self.file_handle_map.get(&file_handle).unwrap();
- assert_eq!(ino as usize, *inode_index);
- if !write {
- reply.error(EACCES);
- } else {
- inode.size = size as u32;
- reply.attr(&TTL, &to_fileattr(*inode_index, &inode));
- self.update_inode(*inode_index, inode);
- }
- } else {
- if !check_access(req.uid(), req.gid(), inode.uid, inode.gid, inode.mode, W_OK) {
- reply.error(EACCES);
- } else {
- inode.size = size as u32;
- reply.attr(&TTL, &to_fileattr(ino as usize, &inode));
- }
- }
- return;
- }
-
- // time 相关
- if atime.is_some() || mtime.is_some() {
- let current_time = time_now();
- if let Some(atime) = atime {
- debug!("utimensat on inode {:#x?}, atime {:?}", ino, atime);
- // root 和 user 可以随意修改 atime, 其他用户只能 touch (即 atime == Now)
- if req.uid() != 0 && req.uid() != inode.uid && atime != Now {
- reply.error(EPERM);
- return;
- }
-
- if req.uid() != 0
- && req.uid() != inode.uid
- && check_access(
- req.uid(),
- req.gid(),
- inode.uid,
- inode.gid,
- inode.mode,
- R_OK, // atime 来说是 read TODO 对吗
- )
- {
- reply.error(EACCES);
- return;
- }
-
- inode.atime = match atime {
- SpecificTime(time) => from_systime(time),
- Now => current_time,
- };
- inode.ctime = current_time;
- }
- if let Some(mtime) = mtime {
- debug!("utimensat on inode {:#x?}, mtime {:?}", ino, mtime);
- // root 和 user 可以随意修改 mtime, 其他用户只能 mtime == Now
- if req.uid() != 0 && req.uid() != inode.uid && mtime != Now {
- reply.error(EPERM);
- return;
- }
-
- if req.uid() != 0
- && req.uid() != inode.uid
- && check_access(
- req.uid(),
- req.gid(),
- inode.uid,
- inode.gid,
- inode.mode,
- W_OK, // mtime 来说是 write
- )
- {
- reply.error(EACCES);
- return;
- }
-
- inode.mtime = match mtime {
- SpecificTime(time) => from_systime(time),
- Now => current_time,
- };
- inode.ctime = current_time;
- }
- }
- reply.attr(&TTL, &to_fileattr(ino as usize, inode));
- return;
- } else {
- reply.error(ENOENT);
- }
- }
-
- // 这啥语义啊??
- fn readlink(&mut self, req: &Request<'_>, ino: u64, reply: ReplyData) {
- debug!("readlink(ino: {})", ino);
- if let Some(inode) = self.get_inode(ino as usize) {
- if !inode.is_symlink() {
- reply.error(ENOENT);
- return;
- }
- if !check_access(req.uid(), req.gid(), inode.uid, inode.gid, inode.mode, R_OK) {
- reply.error(EACCES);
- return;
- }
- let path_length = inode.size as usize;
- let mut path = vec![0u8; path_length];
- if path_length < 60 {
- debug!(
- "symlink path length is {}, reading directly from inode.direct",
- path_length
- );
- let copy_src = unsafe {
- let src = (&inode.direct) as *const u32 as *const u8;
- slice::from_raw_parts(src, path_length)
- };
- path.as_mut_slice().copy_from_slice(copy_src);
- } else {
- debug!(
- "symlink path length is {}, using original read",
- path_length
- );
- let inode = inode.clone();
- let mut read_ptr = 0usize;
- while read_ptr < path_length {
- let block_index = read_ptr / BLOCK_SIZE;
- let offset = read_ptr % BLOCK_SIZE;
-
- let read_length_within_block = if BLOCK_SIZE - offset < path_length - read_ptr {
- BLOCK_SIZE - offset
- } else {
- path_length - read_ptr
- };
-
- if let Some(block) = self.access_block::<DataBlock>(&inode, block_index) {
- (&mut path[read_ptr..read_ptr + read_length_within_block]).copy_from_slice(
- &block.block.0[offset..offset + read_length_within_block],
- );
- read_ptr += read_length_within_block;
- } else {
- reply.error(EIO);
- return;
- }
- }
- }
- debug!(
- "readlink path read is {:?}",
- OsStr::from_bytes(path.as_slice())
- );
- reply.data(path.as_slice());
- } else {
- reply.error(ENOENT);
- }
- }
-
- fn mknod(
- &mut self,
- req: &Request<'_>,
- parent: u64,
- name: &OsStr,
- mode: u32,
- _umask: u32, // umask 是用不到的
- _rdev: u32, // the device number (only valid if created file is a device)
- reply: ReplyEntry,
- ) {
- debug!(
- "mknod(parent: {}, name: {:?}, mode: {}, umask: {})",
- parent, name, mode, _umask
- );
-
- let parent = parent as usize;
- if let Some(parent_inode) = self.get_inode(parent) {
- if !check_access(
- req.uid(),
- req.gid(),
- parent_inode.uid,
- parent_inode.gid,
- parent_inode.mode,
- W_OK,
- ) {
- reply.error(EACCES);
- return;
- }
-
- // parent 不是 IFDIR -> Not a directory
- if !parent_inode.is_dir() {
- reply.error(ENOTDIR);
- return;
- }
-
- // 文件名长度超过 255, 返回 filename too long
- if name.len() > 255 {
- reply.error(ENAMETOOLONG);
- return;
- }
-
- let mut parent_inode = parent_inode.clone();
- // 如果已经存在, 返回 already exists
- if self.lookup_name(parent, &parent_inode, name).is_ok() {
- reply.error(EEXIST);
- return;
- }
-
- let mode = mode as u16;
- if let Some((child_inode_index, child_inode)) =
- self.create_file(mode, req.uid(), req.gid(), 0)
- {
- let mode = child_inode.mode;
- let file_attr = to_fileattr(child_inode_index, child_inode);
- if let Err(err_code) = self.add_direntry(
- parent,
- &mut parent_inode,
- child_inode_index,
- name,
- mode.into(),
- ) {
- reply.error(err_code);
- return;
- }
- self.update_inode(parent, parent_inode); // 前面 clone 了, 这里写回
- reply.entry(&TTL, &file_attr, 0);
- } else {
- // create_inode 失败 -> no enough space
- reply.error(ENOSPC);
- }
- } else {
- // parent 不存在 -> No such file or directory
- reply.error(ENOENT);
- }
- }
-
- fn mkdir(
- &mut self,
- req: &Request<'_>,
- parent: u64,
- name: &OsStr,
- mode: u32,
- _umask: u32, // umask 应该也是用不到的
- reply: ReplyEntry,
- ) {
- if let Some(parent_inode) = self.get_inode(parent as usize) {
- // 无权限创建 -> EACCES
- if !check_access(
- req.uid(),
- req.gid(),
- parent_inode.uid,
- parent_inode.gid,
- parent_inode.mode,
- W_OK,
- ) {
- reply.error(EACCES);
- return;
- }
-
- // parent 不是 IFDIR -> Not a directory
- if !parent_inode.is_dir() {
- reply.error(ENOTDIR);
- return;
- }
-
- // 文件名长度超过 255 -> filename too long
- if name.len() > 255 {
- reply.error(ENAMETOOLONG);
- return;
- }
-
- let mut parent_inode = parent_inode.clone();
- // 已经存在 -> File exists
- if self
- .lookup_name(parent as usize, &parent_inode, name)
- .is_ok()
- {
- reply.error(EEXIST);
- return;
- }
-
- let mode = mode as u16;
- if let Some((child_inode_index, child_inode)) =
- self.create_directory(mode, req.uid(), req.gid(), 0, Some(parent as usize))
- {
- let child_inode = child_inode.clone();
- let file_attr = to_fileattr(child_inode_index, &child_inode);
- if let Err(err_code) = self.add_direntry(
- parent as usize,
- &mut parent_inode,
- child_inode_index,
- name,
- child_inode.mode.into(),
- ) {
- reply.error(err_code);
- return;
- }
- self.update_inode(parent as usize, parent_inode); // 前面 clone 了, 这里写回
- reply.entry(&TTL, &file_attr, 0);
- } else {
- // create_inode 失败 -> no enough space
- reply.error(ENOSPC);
- }
- } else {
- // parent 不存在 -> No such file or directory
- reply.error(ENOENT);
- }
- }
-
- fn unlink(&mut self, req: &Request<'_>, parent: u64, name: &OsStr, reply: ReplyEmpty) {
- debug!("unlink(parent: {:#x?}, name: {:?})", parent, name,);
- if let Some(parent_inode) = self.get_inode(parent as usize) {
- // 无权限删除 -> EACCES
- if !check_access(
- req.uid(),
- req.gid(),
- parent_inode.uid,
- parent_inode.gid,
- parent_inode.mode,
- W_OK,
- ) {
- reply.error(EACCES);
- return;
- }
-
- // parent 不是 dir -> ENOTDIR
- if !parent_inode.is_dir() {
- reply.error(ENOTDIR);
- return;
- }
-
- // 文件名长度超过 255 -> filename too long
- if name.len() > 255 {
- reply.error(ENAMETOOLONG);
- return;
- }
-
- let mut parent_inode = parent_inode.clone();
- // 不存在 -> No such file or directory
- if let Ok((inode_index, entry_index, mut inode)) =
- self.lookup_name(parent as usize, &parent_inode, name)
- {
- let inode_index = inode_index as usize;
-
- match inode.file_type() {
- FileType::RegularFile => {
- inode.n_links -= 1;
- if inode.n_links == 0 {
- // n_links == 0 -> 整个 inode 都要删除掉
- match self.remove_file(inode_index) {
- Ok(flag) => debug!(" unlink {}", flag),
- Err(err_code) => {
- reply.error(err_code);
- return;
- }
- }
- } else {
- // n_links > 0 -> 只是移除了一个 hard link, 将改动写回
- self.update_inode(inode_index, inode);
- }
- }
- FileType::Symlink => {}
- FileType::Directory => {
- reply.error(EISDIR);
- return;
- }
- _ => {
- // Not implemented!
- reply.error(EIO);
- return;
- }
- }
-
- // 删除 dir entry
- if let Err(err_code) =
- self.remove_direntry(parent as usize, &mut parent_inode, name, entry_index)
- {
- reply.error(err_code);
- return;
- }
- reply.ok();
- } else {
- reply.error(ENOENT);
- }
- } else {
- reply.error(ENOENT);
- }
- }
-
- fn rmdir(&mut self, req: &Request<'_>, parent: u64, name: &OsStr, reply: ReplyEmpty) {
- debug!("rmdir(parent: {:#x?}, name: {:?}", parent, name,);
- if let Some(parent_inode) = self.get_inode(parent as usize) {
- // 无权限删除 -> EACCES
- if !check_access(
- req.uid(),
- req.gid(),
- parent_inode.uid,
- parent_inode.gid,
- parent_inode.mode,
- W_OK,
- ) {
- reply.error(EACCES);
- return;
- }
-
- // parent 不是 dir -> ENOTDIR
- if !parent_inode.is_dir() {
- reply.error(ENOTDIR);
- return;
- }
-
- // 文件名长度超过 255 -> filename too long
- if name.len() > 255 {
- reply.error(ENAMETOOLONG);
- return;
- }
-
- let mut parent_inode = parent_inode.clone();
- // 不存在 -> No such file or directory
- if let Ok((inode_index, entry_index, inode)) =
- self.lookup_name(parent as usize, &parent_inode, name)
- {
- let inode_index = inode_index as usize;
- // 要删除的 entry 是一般文件, 不用 rmdir
- if inode.is_file() {
- reply.error(ENOTDIR);
- return;
- }
-
- // 一定有 . 和 .. 所以 size == 2 就是空目录
- // 目录非空 -> ENOTEMPTY
- if inode.size > 2 {
- reply.error(ENOTEMPTY);
- return;
- }
-
- // directory 没有 hard link, 删了就是删了
- match self.remove_dir(inode_index) {
- Ok(flag) => debug!(" rmdir {}", flag),
- Err(err_code) => {
- reply.error(err_code);
- return;
- }
- }
-
- // 删除 dir entry
- if let Err(err_code) =
- self.remove_direntry(parent as usize, &mut parent_inode, name, entry_index)
- {
- reply.error(err_code);
- return;
- }
-
- reply.ok();
- } else {
- reply.error(ENOENT);
- }
- } else {
- reply.error(ENOENT);
- }
- }
-
- fn symlink(
- &mut self,
- req: &Request<'_>,
- parent: u64,
- link_name: &OsStr,
- target: &Path,
- reply: ReplyEntry,
- ) {
- debug!(
- "symlink(parent: {}, name: {:?}, target: {:?})",
- parent, link_name, target
- );
- let parent = parent as usize;
-
- // let root_inode_index = 1usize;
- // if let Some(root_inode) = self.get_inode(root_inode_index) {
- // let mut curr_inode_index = root_inode_index;
- // let mut curr_inode = root_inode.clone();
- // for segment in target.iter() {
- // match self.lookup_name(curr_inode_index, &curr_inode, segment) {
- // Ok((next_inode_index, _, next_inode)) => {
- // curr_inode_index = next_inode_index as usize;
- // curr_inode = next_inode;
- // }
- // Err(err_code) => {
- // reply.error(err_code);
- // return;
- // }
- // }
- // }
- // } else {
- // reply.error(EIO);
- // return;
- // }
-
- if let Some(parent_inode) = self.get_inode(parent) {
- if !check_access(
- req.uid(),
- req.gid(),
- parent_inode.uid,
- parent_inode.gid,
- parent_inode.mode,
- W_OK,
- ) {
- reply.error(EACCES);
- return;
- }
-
- if !parent_inode.is_dir() {
- reply.error(ENOTDIR);
- return;
- }
-
- if link_name.len() > 255 {
- reply.error(ENAMETOOLONG);
- return;
- }
-
- let target = target.as_os_str();
- let mut parent_inode = parent_inode.clone();
- if self.lookup_name(parent, &parent_inode, link_name).is_ok() {
- reply.error(EEXIST);
- return;
- }
-
- if let Some((child_inode_index, child_inode)) =
- self.create_symlink(0o777, req.uid(), req.gid(), 0)
- {
- let mut child_inode = child_inode.clone();
- child_inode.size = target.len() as u32;
- if target.len() < 60 {
- debug!("create_symlink: target length < 60, allocating in 'direct' section.");
- let target_path = target.as_bytes();
- let copy_dst = unsafe {
- let dst = (&mut child_inode.direct) as *mut u32 as *mut u8;
- slice::from_raw_parts_mut(dst, target_path.len())
- };
- copy_dst.copy_from_slice(target_path);
- } else {
- debug!("create_symlink: target length >= 60, using original layout.");
- let mut write_ptr = 0usize;
- while write_ptr < target.len() {
- let block_index = write_ptr / BLOCK_SIZE;
- let offset = write_ptr % BLOCK_SIZE;
-
- let write_length_within_block =
- if BLOCK_SIZE - offset < target.len() - write_ptr {
- BLOCK_SIZE - offset
- } else {
- target.len() - write_ptr
- };
-
- if let Some(block) =
- self.access_block_mut::<DataBlock>(&child_inode, block_index)
- {
- block.block.0[offset..offset + write_length_within_block]
- .copy_from_slice(
- &target.as_bytes()
- [write_ptr..write_ptr + write_length_within_block],
- );
- write_ptr += write_length_within_block;
- } else {
- if let Some((_block_index, block_index_within_inode)) =
- self.allocate_block_for(&mut child_inode)
- {
- let block = self
- .access_block_mut::<DataBlock>(
- &child_inode,
- block_index_within_inode,
- )
- .unwrap();
- block.block.0[offset..offset + write_length_within_block]
- .copy_from_slice(
- &target.as_bytes()
- [write_ptr..write_ptr + write_length_within_block],
- );
- write_ptr += write_length_within_block;
- } else {
- reply.error(ENOSPC);
- return;
- }
- }
- }
- }
-
- let file_attr = to_fileattr(child_inode_index, &child_inode);
- self.update_inode(child_inode_index, child_inode);
-
- if let Err(err_code) = self.add_direntry(
- parent,
- &mut parent_inode,
- child_inode_index,
- link_name,
- from_filetype(FileType::Symlink),
- ) {
- reply.error(err_code);
- return;
- }
- self.update_inode(parent, parent_inode);
- reply.entry(&TTL, &file_attr, 0);
- } else {
- reply.error(ENOSPC);
- }
- } else {
- reply.error(ENOENT);
- }
- }
-
- fn rename(
- &mut self,
- req: &Request<'_>,
- parent: u64,
- name: &OsStr,
- new_parent: u64,
- new_name: &OsStr,
- flags: u32,
- reply: ReplyEmpty,
- ) {
- debug!(
- "rename(parent: {}, name: {:?}, new_parent: {}, new_name: {:?})",
- parent, name, new_parent, new_name
- );
-
- let parent = parent as usize;
- let new_parent = new_parent as usize;
- if let Some(parent_inode) = self.get_inode(parent) {
- if !check_access(
- req.uid(),
- req.gid(),
- parent_inode.uid,
- parent_inode.gid,
- parent_inode.mode,
- R_OK,
- ) {
- reply.error(EACCES);
- return;
- }
-
- if name.len() > 255 {
- reply.error(ENAMETOOLONG);
- return;
- }
-
- let mut parent_inode = parent_inode.clone();
- match self.lookup_name(parent, &parent_inode, name) {
- Ok((inode_index, entry_index, inode)) => {
- if let Some(new_parent_inode) = self.get_inode(new_parent) {
- if !check_access(
- req.uid(),
- req.gid(),
- new_parent_inode.uid,
- new_parent_inode.gid,
- new_parent_inode.mode,
- W_OK,
- ) {
- reply.error(EACCES);
- return;
- }
- if new_name.len() > 255 {
- reply.error(ENAMETOOLONG);
- return;
- }
-
- let mut new_parent_inode = new_parent_inode.clone();
- match self.lookup_name(new_parent, &new_parent_inode, new_name) {
- Ok((new_inode_index, new_entry_index, new_inode)) => {
- // 新文件存在
- if flags & RENAME_NOREPLACE != 0 { // 指定 noreplace 之后不允许覆盖文件
- reply.error(EEXIST);
- return;
- }
- if flags & RENAME_EXCHANGE != 0 { // 交换两个文件
- if let Err(err_code) = self.exchange_direntry(
- parent,
- &mut parent_inode,
- name,
- new_parent,
- &mut new_parent_inode,
- new_name
- ) {
- reply.error(err_code);
- return;
- }
- } else { // 用新文件替换旧文件
- let dir_entry = self.get_direntry_by_name(parent, &parent_inode, name)
- .unwrap();
- if let Err(err_code) = self.remove_direntry(parent, &mut parent_inode, name, entry_index) {
- reply.error(err_code);
- return;
- }
- if let Err(err_code) = self.remove_direntry(new_parent, &mut new_parent_inode, new_name, new_entry_index) {
- reply.error(err_code);
- return;
- }
- if let Err(err_code) = self.add_direntry_2(new_parent, &mut new_parent_inode, new_name, dir_entry) {
- reply.error(err_code);
- return;
- }
- }
- reply.ok();
- },
- Err(ENOENT) => { // 新文件不存在, 删除旧的创建新的
- let dir_entry = self.get_direntry_by_name(parent, &parent_inode, name)
- .unwrap();
- if let Err(err_code) = self.remove_direntry(parent, &mut parent_inode, name, entry_index) {
- reply.error(err_code);
- return;
- }
- if let Err(err_code) = self.add_direntry_2(new_parent, &mut new_parent_inode, new_name, dir_entry) {
- reply.error(err_code);
- return;
- }
- reply.ok();
- },
- Err(err_code) => {
- // 其他 Err code
- reply.error(err_code);
- return;
- }
- }
- } else {
- reply.error(ENOENT);
- }
- },
- Err(err_code) => {
- reply.error(err_code);
- return;
- }
- }
- } else {
- reply.error(ENOENT);
- }
- }
-
- fn open(&mut self, req: &Request<'_>, ino: u64, flags: i32, reply: ReplyOpen) {
- debug!("open(ino: {:#x?}, flags: {:#x?})", ino, flags);
- let (access_mask, read, write) = match flags & O_ACCMODE {
- O_RDONLY => {
- // Behavior is undefined, but most filesystems return EACCES
- if flags & libc::O_TRUNC != 0 {
- reply.error(EACCES);
- return;
- }
- (R_OK, true, false)
- }
- O_WRONLY => (W_OK, false, true),
- O_RDWR => (R_OK | W_OK, true, true),
- _ => {
- // flag 非法
- reply.error(EINVAL);
- return;
- }
- };
-
- match self.get_inode(ino as usize) {
- Some(inode) => {
- if !check_access(
- req.uid(),
- req.gid(),
- inode.uid,
- inode.gid,
- inode.mode,
- access_mask,
- ) {
- reply.error(EACCES);
- return;
- }
- let fd = self.allocate_file_descriptor(ino as usize, read, write);
- reply.opened(fd, 0);
- }
- None => {
- reply.error(ENOENT);
- }
- }
- }
-
- // read [offset, offset + size)
- // - EOF < offset + size -> return EOF - offset
- // - EOF > offset + size -> return size
- fn read(
- &mut self,
- req: &Request<'_>,
- ino: u64,
- fh: u64,
- offset: i64,
- size: u32,
- _flags: i32,
- _lock_owner: Option<u64>, // 用不到!
- reply: ReplyData,
- ) {
- assert_eq!(self.file_handle_map.get(&fh).unwrap().0, ino as usize);
- if let Some(inode) = self.get_inode(ino as usize) {
- if inode.is_dir() {
- reply.error(EISDIR);
- return;
- }
- if !check_access(req.uid(), req.gid(), inode.uid, inode.gid, inode.mode, R_OK) {
- reply.error(EACCES);
- return;
- }
- debug!("reading inode {:#x} (offset {} size {})", ino, offset, size);
-
- if offset as u32 >= inode.size {
- // offset 在 EOF 后面, 直接返回一个 0 长度的空 buffer
- reply.data(&Vec::new());
- return;
- }
-
- // let read_length = size.min(inode.size.saturating_sub(offset as u32)) as usize;
- // 这和下面那个是等同的但是不利于让人看懂……
- let read_length = if offset as u32 + size <= inode.size {
- size // 没有越过 EOF, 读取 size 个 byte
- } else {
- inode.size - offset as u32 // 越过了 EOF, 读取 inode.size - offset 个 byte
- } as usize;
-
- let mut read_buffer = vec![0u8; read_length];
- let mut read_ptr = 0usize;
-
- let inode = inode.clone();
-
- while read_ptr < read_length {
- let current_point = offset as usize + read_ptr;
- let current_block_index = current_point / BLOCK_SIZE;
- let current_offset = current_point % BLOCK_SIZE;
-
- let read_length_within_block =
- if BLOCK_SIZE - current_offset < read_length - read_ptr {
- BLOCK_SIZE - current_offset // 可以读到 block 最后
- } else {
- read_length - read_ptr // 读到中途会停下来
- };
-
- if let Some(block) = self.access_block::<DataBlock>(&inode, current_block_index) {
- (&mut read_buffer[read_ptr..read_ptr + read_length_within_block])
- .copy_from_slice(
- &block.block.0
- [current_offset..current_offset + read_length_within_block],
- );
- read_ptr += read_length_within_block;
- } else {
- reply.error(EIO);
- return;
- }
- }
-
- reply.data(&read_buffer);
- }
- }
-
- // 写了多少就返回多少
- fn write(
- &mut self,
- req: &Request<'_>,
- ino: u64,
- fh: u64,
- offset: i64,
- data: &[u8],
- _write_flags: u32,
- _flags: i32,
- _lock_owner: Option<u64>,
- reply: ReplyWrite,
- ) {
- assert_eq!(self.file_handle_map.get(&fh).unwrap().0, ino as usize);
- if let Some(inode) = self.get_inode(ino as usize) {
- if inode.is_dir() {
- reply.error(EISDIR);
- return;
- }
- if !check_access(req.uid(), req.gid(), inode.uid, inode.gid, inode.mode, W_OK) {
- reply.error(EACCES);
- return;
- }
- debug!(
- "writing inode {:#x} (offset {} size {})",
- ino,
- offset,
- data.len()
- );
- let write_length = data.len();
- let mut write_ptr = 0usize;
-
- let mut inode = inode.clone();
-
- while write_ptr < write_length {
- let current_point = offset as usize + write_ptr;
- let current_block_index = current_point / BLOCK_SIZE;
- let current_offset = current_point % BLOCK_SIZE;
-
- let write_length_within_block =
- if BLOCK_SIZE - current_offset < write_length - write_ptr {
- BLOCK_SIZE - current_offset // 可以写满 block
- } else {
- write_length - write_ptr // 写完 buffer 就停下来
- };
-
- // 当前块已分配, 直接往里写
- if let Some(block) = self.access_block_mut::<DataBlock>(&inode, current_block_index)
- {
- debug!(
- "writing {} bytes in block {} within inode",
- write_length_within_block, current_block_index
- );
- (block.block.0[current_offset..current_offset + write_length_within_block])
- .copy_from_slice(&data[write_ptr..write_ptr + write_length_within_block]);
- write_ptr += write_length_within_block;
- } else {
- // 当前块未分配，尝试分配
- if let Some((block_index, block_index_within_inode)) =
- self.allocate_block_for(&mut inode)
- {
- debug!("writing {} bytes in allocated block {} within inode, block index is {}", write_length_within_block, block_index_within_inode, block_index);
- // 能分配, 往里写
- let block = self
- .access_block_mut::<DataBlock>(&inode, block_index_within_inode)
- .unwrap();
- (block.block.0[current_offset..current_offset + write_length_within_block])
- .copy_from_slice(
- &data[write_ptr..write_ptr + write_length_within_block],
- );
- write_ptr += write_length_within_block;
- } else {
- // 分配不了, 没空间了
- break;
- }
- }
- }
-
- inode.size = inode.size.max(offset as u32 + write_length as u32);
- self.update_inode(ino as usize, inode);
- reply.written(write_length as u32);
- } else {
- reply.error(ENOENT);
- }
- }
-
- fn release(
- &mut self,
- _req: &Request<'_>,
- ino: u64,
- fh: u64,
- _flags: i32,
- _lock_owner: Option<u64>,
- _flush: bool,
- reply: ReplyEmpty,
- ) {
- debug!("release(ino: {:#x?}, fh: {}", ino, fh);
- if self.file_handle_map.contains_key(&fh) {
- self.file_handle_map.remove(&fh);
- reply.ok();
- } else {
- reply.error(EBADF);
- }
- }
-
- fn opendir(&mut self, req: &Request<'_>, ino: u64, flags: i32, reply: ReplyOpen) {
- debug!("opendir(ino: {:#x?}, flags: {:#x?})", ino, flags);
- let (access_mask, read, write) = match flags & O_ACCMODE {
- O_RDONLY => {
- // Behavior is undefined, but most filesystems return EACCES
- if flags & libc::O_TRUNC != 0 {
- reply.error(EACCES);
- return;
- }
- (R_OK, true, false)
- }
- O_WRONLY => (W_OK, false, true),
- O_RDWR => (R_OK | W_OK, true, true),
- _ => {
- // flag 非法
- reply.error(EINVAL);
- return;
- }
- };
-
- match self.get_inode(ino as usize) {
- Some(inode) => {
- if !check_access(
- req.uid(),
- req.gid(),
- inode.uid,
- inode.gid,
- inode.mode,
- access_mask,
- ) {
- reply.error(EACCES);
- return;
- }
- let fd = self.allocate_file_descriptor(ino as usize, read, write);
- reply.opened(fd, 0);
- }
- None => {
- reply.error(ENOENT);
- }
- }
- }
-
- fn readdir(
- &mut self,
- req: &Request<'_>,
- ino: u64,
- fh: u64, // 如果 invoke 它的 opendir 里有指定 fh, 那么这里会收到 fh 参数
- offset: i64,
- mut reply: ReplyDirectory,
- ) {
- assert_eq!(self.file_handle_map.get(&fh).unwrap().0, ino as usize);
- if let Some(inode) = self.get_inode(ino as usize) {
- if !inode.is_dir() {
- reply.error(ENOTDIR);
- return;
- }
-
- if !check_access(req.uid(), req.gid(), inode.uid, inode.gid, inode.mode, R_OK) {
- reply.error(EACCES);
- return;
- }
-
- debug!(
- "reading dir entries from inode {:#x} with offset {}",
- ino, offset
- );
- let inode = inode.clone();
-
- self.load_direntry_map(ino as usize, &inode).unwrap();
- for (entry_index, (name, dir_entry)) in self
- .dir_entry_map
- .get(&(ino as usize))
- .unwrap()
- .iter()
- .enumerate()
- .skip(offset as usize)
- {
- debug!(
- " entry {} from inode {:#x} with name {:?}",
- entry_index, dir_entry.inode, name
- );
- if reply.add(
- dir_entry.inode as u64,
- entry_index as i64 + 1,
- to_filetype(dir_entry.file_type).expect("not 0x0!"),
- name,
- ) {
- break;
- }
- }
-
- reply.ok();
- } else {
- reply.error(ENOENT);
- }
- }
-
- fn releasedir(
- &mut self,
- _req: &Request<'_>,
- ino: u64,
- fh: u64,
- _flags: i32,
- reply: ReplyEmpty,
- ) {
- debug!("releasedir(ino: {:#x?}, fh: {}", ino, fh);
- if self.file_handle_map.contains_key(&fh) {
- self.file_handle_map.remove(&fh);
- reply.ok();
- } else {
- reply.error(EBADF);
- }
- }
-
- fn access(&mut self, req: &Request<'_>, ino: u64, mask: i32, reply: ReplyEmpty) {
- // mask:
- // - 要么是 libc::F_OK (aka 0), 检查文件是否存在
- // - 要么是 libc::R_OK,libc::W_OK,libc::X_OK (aka 4/2/1) 构成的 bitmask, 检查是否有对应权限
- debug!("Filesystem::access(ino: {}, mask: {})", ino, mask);
-
- if let Some(inode) = self.get_inode(ino as usize) {
- if mask == libc::F_OK // 只要检查是否存在
- || check_access(req.uid(), req.gid(), inode.uid, inode.gid, inode.mode, mask)
- // 需要检查 rwx 权限
- {
- reply.ok();
- } else {
- reply.error(EACCES);
- }
- } else {
- reply.error(ENOENT);
- }
- }
-}
generated by cgit v1.2.3-70-g09d2 (git 2.47.0) at 2024-11-24 16:36:00 +0000