Change FuseAppLoop so that it can process messages asynchronously.
Previously FuseAppLoopCallback needs to return values in a synchrnous manner. The CL changes it to asynchronous mannger so that apps can process FUSE message asynchrnously. Bug: 35229514 Test: FuseAppLoopTest Change-Id: I8edcfdb003a25cfd5e9c490ec871140220b21e35
This commit is contained in:
Daichi Hirono
parent
0bc3add41b
commit
f5d15f9fc4
3 changed files with 279 additions and 229 deletions
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@ -16,205 +16,232 @@
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#include "libappfuse/FuseAppLoop.h"
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#include <sys/eventfd.h>
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#include <sys/stat.h>
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#include <android-base/logging.h>
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#include <android-base/unique_fd.h>
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#include "libappfuse/EpollController.h"
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namespace android {
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namespace fuse {
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namespace {
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void HandleLookUp(FuseBuffer* buffer, FuseAppLoopCallback* callback) {
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// AppFuse does not support directory structure now.
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// It can lookup only files under the mount point.
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if (buffer->request.header.nodeid != FUSE_ROOT_ID) {
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LOG(ERROR) << "Nodeid is not FUSE_ROOT_ID.";
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buffer->response.Reset(0, -ENOENT, buffer->request.header.unique);
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return;
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}
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// Ensure that the filename ends with 0.
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const size_t filename_length =
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buffer->request.header.len - sizeof(fuse_in_header);
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if (buffer->request.lookup_name[filename_length - 1] != 0) {
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LOG(ERROR) << "File name does not end with 0.";
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buffer->response.Reset(0, -ENOENT, buffer->request.header.unique);
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return;
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}
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const uint64_t inode =
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static_cast<uint64_t>(atol(buffer->request.lookup_name));
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if (inode == 0 || inode == LONG_MAX) {
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LOG(ERROR) << "Invalid filename";
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buffer->response.Reset(0, -ENOENT, buffer->request.header.unique);
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return;
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}
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const int64_t size = callback->OnGetSize(inode);
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if (size < 0) {
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buffer->response.Reset(0, size, buffer->request.header.unique);
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return;
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}
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buffer->response.Reset(sizeof(fuse_entry_out), 0,
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buffer->request.header.unique);
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buffer->response.entry_out.nodeid = inode;
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buffer->response.entry_out.attr_valid = 10;
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buffer->response.entry_out.entry_valid = 10;
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buffer->response.entry_out.attr.ino = inode;
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buffer->response.entry_out.attr.mode = S_IFREG | 0777;
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buffer->response.entry_out.attr.size = size;
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}
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void HandleGetAttr(FuseBuffer* buffer, FuseAppLoopCallback* callback) {
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const uint64_t nodeid = buffer->request.header.nodeid;
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int64_t size;
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uint32_t mode;
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if (nodeid == FUSE_ROOT_ID) {
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size = 0;
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mode = S_IFDIR | 0777;
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} else {
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size = callback->OnGetSize(buffer->request.header.nodeid);
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if (size < 0) {
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buffer->response.Reset(0, size, buffer->request.header.unique);
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return;
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bool HandleLookUp(FuseAppLoop* loop, FuseBuffer* buffer, FuseAppLoopCallback* callback) {
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// AppFuse does not support directory structure now.
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// It can lookup only files under the mount point.
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if (buffer->request.header.nodeid != FUSE_ROOT_ID) {
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LOG(ERROR) << "Nodeid is not FUSE_ROOT_ID.";
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return loop->ReplySimple(buffer->request.header.unique, -ENOENT);
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}
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mode = S_IFREG | 0777;
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}
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buffer->response.Reset(sizeof(fuse_attr_out), 0,
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buffer->request.header.unique);
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buffer->response.attr_out.attr_valid = 10;
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buffer->response.attr_out.attr.ino = nodeid;
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buffer->response.attr_out.attr.mode = mode;
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buffer->response.attr_out.attr.size = size;
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// Ensure that the filename ends with 0.
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const size_t filename_length = buffer->request.header.len - sizeof(fuse_in_header);
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if (buffer->request.lookup_name[filename_length - 1] != 0) {
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LOG(ERROR) << "File name does not end with 0.";
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return loop->ReplySimple(buffer->request.header.unique, -ENOENT);
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}
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const uint64_t inode = static_cast<uint64_t>(atol(buffer->request.lookup_name));
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if (inode == 0 || inode == LONG_MAX) {
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LOG(ERROR) << "Invalid filename";
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return loop->ReplySimple(buffer->request.header.unique, -ENOENT);
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}
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callback->OnLookup(buffer->request.header.unique, inode);
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return true;
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}
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void HandleOpen(FuseBuffer* buffer, FuseAppLoopCallback* callback) {
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const int32_t file_handle = callback->OnOpen(buffer->request.header.nodeid);
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if (file_handle < 0) {
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buffer->response.Reset(0, file_handle, buffer->request.header.unique);
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return;
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}
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buffer->response.Reset(sizeof(fuse_open_out), kFuseSuccess,
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buffer->request.header.unique);
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buffer->response.open_out.fh = file_handle;
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bool HandleGetAttr(FuseAppLoop* loop, FuseBuffer* buffer, FuseAppLoopCallback* callback) {
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if (buffer->request.header.nodeid == FUSE_ROOT_ID) {
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return loop->ReplyGetAttr(buffer->request.header.unique, buffer->request.header.nodeid, 0,
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S_IFDIR | 0777);
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} else {
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callback->OnGetAttr(buffer->request.header.unique, buffer->request.header.nodeid);
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return true;
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}
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}
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void HandleFsync(FuseBuffer* buffer, FuseAppLoopCallback* callback) {
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buffer->response.Reset(0, callback->OnFsync(buffer->request.header.nodeid),
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buffer->request.header.unique);
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bool HandleRead(FuseAppLoop* loop, FuseBuffer* buffer, FuseAppLoopCallback* callback) {
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if (buffer->request.read_in.size > kFuseMaxRead) {
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return loop->ReplySimple(buffer->request.header.unique, -EINVAL);
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}
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callback->OnRead(buffer->request.header.unique, buffer->request.header.nodeid,
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buffer->request.read_in.offset, buffer->request.read_in.size);
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return true;
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}
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void HandleRelease(FuseBuffer* buffer, FuseAppLoopCallback* callback) {
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buffer->response.Reset(0, callback->OnRelease(buffer->request.header.nodeid),
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buffer->request.header.unique);
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bool HandleWrite(FuseAppLoop* loop, FuseBuffer* buffer, FuseAppLoopCallback* callback) {
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if (buffer->request.write_in.size > kFuseMaxWrite) {
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return loop->ReplySimple(buffer->request.header.unique, -EINVAL);
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}
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callback->OnWrite(buffer->request.header.unique, buffer->request.header.nodeid,
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buffer->request.write_in.offset, buffer->request.write_in.size,
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buffer->request.write_data);
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return true;
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}
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void HandleRead(FuseBuffer* buffer, FuseAppLoopCallback* callback) {
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const uint64_t unique = buffer->request.header.unique;
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const uint64_t nodeid = buffer->request.header.nodeid;
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const uint64_t offset = buffer->request.read_in.offset;
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const uint32_t size = buffer->request.read_in.size;
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bool HandleMessage(FuseAppLoop* loop, FuseBuffer* buffer, int fd, FuseAppLoopCallback* callback) {
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if (!buffer->request.Read(fd)) {
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return false;
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}
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if (size > kFuseMaxRead) {
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buffer->response.Reset(0, -EINVAL, buffer->request.header.unique);
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return;
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}
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const uint32_t opcode = buffer->request.header.opcode;
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LOG(VERBOSE) << "Read a fuse packet, opcode=" << opcode;
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switch (opcode) {
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case FUSE_FORGET:
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// Do not reply to FUSE_FORGET.
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return true;
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const int32_t read_size = callback->OnRead(nodeid, offset, size,
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buffer->response.read_data);
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if (read_size < 0) {
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buffer->response.Reset(0, read_size, buffer->request.header.unique);
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return;
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}
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case FUSE_LOOKUP:
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return HandleLookUp(loop, buffer, callback);
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buffer->response.ResetHeader(read_size, kFuseSuccess, unique);
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}
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case FUSE_GETATTR:
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return HandleGetAttr(loop, buffer, callback);
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void HandleWrite(FuseBuffer* buffer, FuseAppLoopCallback* callback) {
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const uint64_t unique = buffer->request.header.unique;
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const uint64_t nodeid = buffer->request.header.nodeid;
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const uint64_t offset = buffer->request.write_in.offset;
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const uint32_t size = buffer->request.write_in.size;
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case FUSE_OPEN:
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callback->OnOpen(buffer->request.header.unique, buffer->request.header.nodeid);
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return true;
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if (size > kFuseMaxWrite) {
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buffer->response.Reset(0, -EINVAL, buffer->request.header.unique);
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return;
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}
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case FUSE_READ:
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return HandleRead(loop, buffer, callback);
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const int32_t write_size = callback->OnWrite(nodeid, offset, size,
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buffer->request.write_data);
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if (write_size < 0) {
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buffer->response.Reset(0, write_size, buffer->request.header.unique);
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return;
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}
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case FUSE_WRITE:
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return HandleWrite(loop, buffer, callback);
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buffer->response.Reset(sizeof(fuse_write_out), kFuseSuccess, unique);
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buffer->response.write_out.size = write_size;
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case FUSE_RELEASE:
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callback->OnRelease(buffer->request.header.unique, buffer->request.header.nodeid);
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return true;
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case FUSE_FSYNC:
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callback->OnFsync(buffer->request.header.unique, buffer->request.header.nodeid);
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return true;
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default:
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buffer->HandleNotImpl();
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return buffer->response.Write(fd);
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}
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}
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} // namespace
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bool StartFuseAppLoop(int raw_fd, FuseAppLoopCallback* callback) {
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base::unique_fd fd(raw_fd);
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FuseBuffer buffer;
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FuseAppLoopCallback::~FuseAppLoopCallback() = default;
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LOG(DEBUG) << "Start fuse loop.";
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while (callback->IsActive()) {
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if (!buffer.request.Read(fd)) {
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return false;
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FuseAppLoop::FuseAppLoop(base::unique_fd&& fd) : fd_(std::move(fd)) {}
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void FuseAppLoop::Break() {
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const int64_t value = 1;
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if (write(break_fd_, &value, sizeof(value)) == -1) {
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PLOG(ERROR) << "Failed to send a break event";
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}
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}
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bool FuseAppLoop::ReplySimple(uint64_t unique, int32_t result) {
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if (result == -ENOSYS) {
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// We should not return -ENOSYS because the kernel stops delivering FUSE
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// command after receiving -ENOSYS as a result for the command.
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result = -EBADF;
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}
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FuseSimpleResponse response;
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response.Reset(0, result, unique);
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return response.Write(fd_);
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}
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bool FuseAppLoop::ReplyLookup(uint64_t unique, uint64_t inode, int64_t size) {
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FuseSimpleResponse response;
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response.Reset(sizeof(fuse_entry_out), 0, unique);
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response.entry_out.nodeid = inode;
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response.entry_out.attr_valid = 10;
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response.entry_out.entry_valid = 10;
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response.entry_out.attr.ino = inode;
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response.entry_out.attr.mode = S_IFREG | 0777;
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response.entry_out.attr.size = size;
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return response.Write(fd_);
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}
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bool FuseAppLoop::ReplyGetAttr(uint64_t unique, uint64_t inode, int64_t size, int mode) {
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CHECK(mode == (S_IFREG | 0777) || mode == (S_IFDIR | 0777));
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FuseSimpleResponse response;
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response.Reset(sizeof(fuse_attr_out), 0, unique);
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response.attr_out.attr_valid = 10;
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response.attr_out.attr.ino = inode;
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response.attr_out.attr.mode = mode;
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response.attr_out.attr.size = size;
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return response.Write(fd_);
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}
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bool FuseAppLoop::ReplyOpen(uint64_t unique, uint64_t fh) {
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FuseSimpleResponse response;
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response.Reset(sizeof(fuse_open_out), kFuseSuccess, unique);
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response.open_out.fh = fh;
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return response.Write(fd_);
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}
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bool FuseAppLoop::ReplyWrite(uint64_t unique, uint32_t size) {
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CHECK(size <= kFuseMaxWrite);
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FuseSimpleResponse response;
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response.Reset(sizeof(fuse_write_out), kFuseSuccess, unique);
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response.write_out.size = size;
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return response.Write(fd_);
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}
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bool FuseAppLoop::ReplyRead(uint64_t unique, uint32_t size, const void* data) {
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CHECK(size <= kFuseMaxRead);
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FuseSimpleResponse response;
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response.ResetHeader(size, kFuseSuccess, unique);
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return response.WriteWithBody(fd_, sizeof(FuseResponse), data);
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}
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void FuseAppLoop::Start(FuseAppLoopCallback* callback) {
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break_fd_.reset(eventfd(/* initval */ 0, EFD_CLOEXEC));
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if (break_fd_.get() == -1) {
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PLOG(ERROR) << "Failed to open FD for break event";
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return;
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}
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const uint32_t opcode = buffer.request.header.opcode;
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LOG(VERBOSE) << "Read a fuse packet, opcode=" << opcode;
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switch (opcode) {
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case FUSE_FORGET:
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// Do not reply to FUSE_FORGET.
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continue;
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case FUSE_LOOKUP:
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HandleLookUp(&buffer, callback);
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break;
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case FUSE_GETATTR:
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HandleGetAttr(&buffer, callback);
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break;
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case FUSE_OPEN:
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HandleOpen(&buffer, callback);
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break;
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case FUSE_READ:
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HandleRead(&buffer, callback);
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break;
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case FUSE_WRITE:
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HandleWrite(&buffer, callback);
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break;
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case FUSE_RELEASE:
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HandleRelease(&buffer, callback);
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break;
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case FUSE_FSYNC:
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HandleFsync(&buffer, callback);
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break;
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default:
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buffer.HandleNotImpl();
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break;
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base::unique_fd epoll_fd(epoll_create1(EPOLL_CLOEXEC));
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if (epoll_fd.get() == -1) {
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PLOG(ERROR) << "Failed to open FD for epoll";
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return;
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}
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if (!buffer.response.Write(fd)) {
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LOG(ERROR) << "Failed to write a response to the device.";
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return false;
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}
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}
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int last_event;
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int break_event;
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return true;
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std::unique_ptr<EpollController> epoll_controller(new EpollController(std::move(epoll_fd)));
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if (!epoll_controller->AddFd(fd_, EPOLLIN, &last_event)) {
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return;
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}
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if (!epoll_controller->AddFd(break_fd_, EPOLLIN, &break_event)) {
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return;
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}
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last_event = 0;
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break_event = 0;
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FuseBuffer buffer;
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while (true) {
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if (!epoll_controller->Wait(1)) {
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break;
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}
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last_event = 0;
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*reinterpret_cast<int*>(epoll_controller->events()[0].data.ptr) =
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epoll_controller->events()[0].events;
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if (break_event != 0 || (last_event & ~EPOLLIN) != 0) {
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break;
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}
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if (!HandleMessage(this, &buffer, fd_, callback)) {
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break;
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}
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}
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LOG(VERBOSE) << "FuseAppLoop exit";
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}
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} // namespace fuse
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@ -17,23 +17,51 @@
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#ifndef ANDROID_LIBAPPFUSE_FUSEAPPLOOP_H_
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#define ANDROID_LIBAPPFUSE_FUSEAPPLOOP_H_
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#include <memory>
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#include <mutex>
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#include <android-base/unique_fd.h>
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#include "libappfuse/FuseBuffer.h"
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namespace android {
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namespace fuse {
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class EpollController;
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class FuseAppLoopCallback {
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public:
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virtual bool IsActive() = 0;
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virtual int64_t OnGetSize(uint64_t inode) = 0;
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virtual int32_t OnFsync(uint64_t inode) = 0;
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virtual int32_t OnWrite(
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uint64_t inode, uint64_t offset, uint32_t size, const void* data) = 0;
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virtual int32_t OnRead(
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uint64_t inode, uint64_t offset, uint32_t size, void* data) = 0;
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virtual int32_t OnOpen(uint64_t inode) = 0;
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virtual int32_t OnRelease(uint64_t inode) = 0;
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virtual ~FuseAppLoopCallback() = default;
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virtual void OnLookup(uint64_t unique, uint64_t inode) = 0;
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virtual void OnGetAttr(uint64_t unique, uint64_t inode) = 0;
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virtual void OnFsync(uint64_t unique, uint64_t inode) = 0;
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virtual void OnWrite(uint64_t unique, uint64_t inode, uint64_t offset, uint32_t size,
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const void* data) = 0;
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virtual void OnRead(uint64_t unique, uint64_t inode, uint64_t offset, uint32_t size) = 0;
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virtual void OnOpen(uint64_t unique, uint64_t inode) = 0;
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virtual void OnRelease(uint64_t unique, uint64_t inode) = 0;
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virtual ~FuseAppLoopCallback();
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};
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class FuseAppLoop final {
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public:
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FuseAppLoop(base::unique_fd&& fd);
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void Start(FuseAppLoopCallback* callback);
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void Break();
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bool ReplySimple(uint64_t unique, int32_t result);
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bool ReplyLookup(uint64_t unique, uint64_t inode, int64_t size);
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bool ReplyGetAttr(uint64_t unique, uint64_t inode, int64_t size, int mode);
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bool ReplyOpen(uint64_t unique, uint64_t fh);
|
||||
bool ReplyWrite(uint64_t unique, uint32_t size);
|
||||
bool ReplyRead(uint64_t unique, uint32_t size, const void* data);
|
||||
|
||||
private:
|
||||
base::unique_fd fd_;
|
||||
base::unique_fd break_fd_;
|
||||
|
||||
// Lock for multi-threading.
|
||||
std::mutex mutex_;
|
||||
};
|
||||
|
||||
bool StartFuseAppLoop(int fd, FuseAppLoopCallback* callback);
|
||||
|
|
|
|||
|
|
@ -23,6 +23,9 @@
|
|||
#include <gtest/gtest.h>
|
||||
#include <thread>
|
||||
|
||||
#include "libappfuse/EpollController.h"
|
||||
#include "libappfuse/FuseBridgeLoop.h"
|
||||
|
||||
namespace android {
|
||||
namespace fuse {
|
||||
namespace {
|
||||
|
|
@ -37,82 +40,61 @@ struct CallbackRequest {
|
|||
class Callback : public FuseAppLoopCallback {
|
||||
public:
|
||||
std::vector<CallbackRequest> requests;
|
||||
FuseAppLoop* loop;
|
||||
|
||||
bool IsActive() override {
|
||||
return true;
|
||||
void OnGetAttr(uint64_t seq, uint64_t inode) override {
|
||||
EXPECT_NE(FUSE_ROOT_ID, static_cast<int>(inode));
|
||||
EXPECT_TRUE(loop->ReplyGetAttr(seq, inode, kTestFileSize, S_IFREG | 0777));
|
||||
}
|
||||
|
||||
int64_t OnGetSize(uint64_t inode) override {
|
||||
if (inode == FUSE_ROOT_ID) {
|
||||
return 0;
|
||||
} else {
|
||||
return kTestFileSize;
|
||||
}
|
||||
void OnLookup(uint64_t unique, uint64_t inode) override {
|
||||
EXPECT_NE(FUSE_ROOT_ID, static_cast<int>(inode));
|
||||
EXPECT_TRUE(loop->ReplyLookup(unique, inode, kTestFileSize));
|
||||
}
|
||||
|
||||
int32_t OnFsync(uint64_t inode) override {
|
||||
requests.push_back({
|
||||
.code = FUSE_FSYNC,
|
||||
.inode = inode
|
||||
});
|
||||
return 0;
|
||||
void OnFsync(uint64_t seq, uint64_t inode) override {
|
||||
requests.push_back({.code = FUSE_FSYNC, .inode = inode});
|
||||
loop->ReplySimple(seq, 0);
|
||||
}
|
||||
|
||||
int32_t OnWrite(uint64_t inode,
|
||||
uint64_t offset ATTRIBUTE_UNUSED,
|
||||
uint32_t size ATTRIBUTE_UNUSED,
|
||||
const void* data ATTRIBUTE_UNUSED) override {
|
||||
requests.push_back({
|
||||
.code = FUSE_WRITE,
|
||||
.inode = inode
|
||||
});
|
||||
return 0;
|
||||
void OnWrite(uint64_t seq, uint64_t inode, uint64_t offset ATTRIBUTE_UNUSED,
|
||||
uint32_t size ATTRIBUTE_UNUSED, const void* data ATTRIBUTE_UNUSED) override {
|
||||
requests.push_back({.code = FUSE_WRITE, .inode = inode});
|
||||
loop->ReplyWrite(seq, 0);
|
||||
}
|
||||
|
||||
int32_t OnRead(uint64_t inode,
|
||||
uint64_t offset ATTRIBUTE_UNUSED,
|
||||
uint32_t size ATTRIBUTE_UNUSED,
|
||||
void* data ATTRIBUTE_UNUSED) override {
|
||||
requests.push_back({
|
||||
.code = FUSE_READ,
|
||||
.inode = inode
|
||||
});
|
||||
return 0;
|
||||
void OnRead(uint64_t seq, uint64_t inode, uint64_t offset ATTRIBUTE_UNUSED,
|
||||
uint32_t size ATTRIBUTE_UNUSED) override {
|
||||
requests.push_back({.code = FUSE_READ, .inode = inode});
|
||||
loop->ReplySimple(seq, 0);
|
||||
}
|
||||
|
||||
int32_t OnOpen(uint64_t inode) override {
|
||||
requests.push_back({
|
||||
.code = FUSE_OPEN,
|
||||
.inode = inode
|
||||
});
|
||||
return 0;
|
||||
void OnOpen(uint64_t seq, uint64_t inode) override {
|
||||
requests.push_back({.code = FUSE_OPEN, .inode = inode});
|
||||
loop->ReplyOpen(seq, inode);
|
||||
}
|
||||
|
||||
int32_t OnRelease(uint64_t inode) override {
|
||||
requests.push_back({
|
||||
.code = FUSE_RELEASE,
|
||||
.inode = inode
|
||||
});
|
||||
return 0;
|
||||
void OnRelease(uint64_t seq, uint64_t inode) override {
|
||||
requests.push_back({.code = FUSE_RELEASE, .inode = inode});
|
||||
loop->ReplySimple(seq, 0);
|
||||
}
|
||||
};
|
||||
|
||||
class FuseAppLoopTest : public ::testing::Test {
|
||||
private:
|
||||
std::thread thread_;
|
||||
|
||||
protected:
|
||||
base::unique_fd sockets_[2];
|
||||
Callback callback_;
|
||||
FuseRequest request_;
|
||||
FuseResponse response_;
|
||||
std::thread thread_;
|
||||
base::unique_fd sockets_[2];
|
||||
Callback callback_;
|
||||
FuseRequest request_;
|
||||
FuseResponse response_;
|
||||
std::unique_ptr<FuseAppLoop> loop_;
|
||||
|
||||
void SetUp() override {
|
||||
base::SetMinimumLogSeverity(base::VERBOSE);
|
||||
ASSERT_TRUE(SetupMessageSockets(&sockets_));
|
||||
thread_ = std::thread([this] {
|
||||
StartFuseAppLoop(sockets_[1].release(), &callback_);
|
||||
});
|
||||
void SetUp() override {
|
||||
base::SetMinimumLogSeverity(base::VERBOSE);
|
||||
ASSERT_TRUE(SetupMessageSockets(&sockets_));
|
||||
loop_.reset(new FuseAppLoop(std::move(sockets_[1])));
|
||||
callback_.loop = loop_.get();
|
||||
thread_ = std::thread([this] { loop_->Start(&callback_); });
|
||||
}
|
||||
|
||||
void CheckCallback(
|
||||
|
|
@ -300,5 +282,18 @@ TEST_F(FuseAppLoopTest, Write) {
|
|||
CheckCallback(sizeof(fuse_write_in), FUSE_WRITE, sizeof(fuse_write_out));
|
||||
}
|
||||
|
||||
TEST_F(FuseAppLoopTest, Break) {
|
||||
// Ensure that the loop started.
|
||||
request_.Reset(sizeof(fuse_open_in), FUSE_OPEN, 1);
|
||||
request_.header.nodeid = 10;
|
||||
ASSERT_TRUE(request_.Write(sockets_[0]));
|
||||
ASSERT_TRUE(response_.Read(sockets_[0]));
|
||||
|
||||
loop_->Break();
|
||||
if (thread_.joinable()) {
|
||||
thread_.join();
|
||||
}
|
||||
}
|
||||
|
||||
} // namespace fuse
|
||||
} // namespace android
|
||||
|
|
|
|||
Loading…
Reference in a new issue