nfs4: Add support for volatile filehandles

src/add-ons/kernel/file_systems/nfs4/Filehandle.h

@@ -36,8 +36,7 @@ struct FileInfo {
 
 			Filehandle	fParent;
 			const char*	fName;
-
+			const char*	fPath;
-			// ... full path may be needed if filehandles are volatile
 
 	inline				FileInfo();
 	inline				~FileInfo();
@@ -76,7 +75,8 @@ inline
 FileInfo::FileInfo()
 	:
 	fFileId(0),
-	fName(NULL)
+	fName(NULL),
+	fPath(NULL)
 {
 }
 
@@ -85,6 +85,7 @@ inline
 FileInfo::~FileInfo()
 {
 	free(const_cast<char*>(fName));
+	free(const_cast<char*>(fPath));
 }
 
 
@@ -94,7 +95,8 @@ FileInfo::FileInfo(const FileInfo& fi)
 	fFileId(fi.fFileId),
 	fFH(fi.fFH),
 	fParent(fi.fParent),
-	fName(strdup(fi.fName))
+	fName(strdup(fi.fName)),
+	fPath(strdup(fi.fPath))
 {
 }
 
@@ -108,6 +110,10 @@ FileInfo::operator=(const FileInfo& fi)
 
 	free(const_cast<char*>(fName));
 	fName = strdup(fi.fName);
+
+	free(const_cast<char*>(fPath));
+	fPath = strdup(fi.fPath);
+
 	return *this;
 }
 

src/add-ons/kernel/file_systems/nfs4/Filesystem.cpp

@@ -18,6 +18,7 @@
 
 Filesystem::Filesystem()
 	:
+	fPath(NULL),
 	fId(1)
 {
 }
@@ -25,6 +26,7 @@ Filesystem::Filesystem()
 
 Filesystem::~Filesystem()
 {
+	free(const_cast<char*>(fPath));
 }
 
 
@@ -60,8 +62,6 @@ Filesystem::Mount(Filesystem** pfs, RPC::Server* serv, const char* fsPath,
 
 	req.GetFH();
 	req.Access();
-	Attribute attr[] = { FATTR4_FH_EXPIRE_TYPE };
-	req.GetAttr(attr, sizeof(attr) / sizeof(Attribute));
 
 	status_t result = request.Send();
 	if (result != B_OK)
@@ -92,32 +92,12 @@ Filesystem::Mount(Filesystem** pfs, RPC::Server* serv, const char* fsPath,
 				!= (ACCESS4_READ | ACCESS4_LOOKUP))
 		return B_PERMISSION_DENIED;
 
-	AttrValue* values;
-	uint32 count;
-	result = reply.GetAttr(&values, &count);
-	if (result != B_OK)
-		return result;
-
-	if (count != 1 || values[0].fAttribute != FATTR4_FH_EXPIRE_TYPE) {
-		delete[] values;
-		return B_BAD_VALUE;
-	}
-
-	// Currently, only persistent filehandles are supported. That will be
-	// changed soon.
-	if (values[0].fData.fValue32 != FH4_PERSISTENT) {
-		delete[] values;
-		return B_UNSUPPORTED;
-	}
-
 	Filesystem* fs = new(std::nothrow) Filesystem;
-	fs->fFHExpiryType = values[0].fData.fValue32;
+	fs->fPath = strdup(fsPath);
 	memcpy(&fs->fRootFH, &fh, sizeof(Filehandle));
 	fs->fServer = serv;
 	fs->fDevId = id;
 
-	delete[] values;
-
 	*pfs = fs;
 
 	return B_OK;
@@ -152,6 +132,7 @@ Filesystem::CreateRootInode()
 	fi.fFH = fRootFH;
 	fi.fParent = fRootFH;
 	fi.fName = strdup("/");
+	fi.fPath = strdup(fPath);
 
 	Inode* inode;
 	status_t result = Inode::CreateInode(this, fi, &inode);

src/add-ons/kernel/file_systems/nfs4/Filesystem.h

@@ -26,8 +26,6 @@ public:
 			status_t		GetInode(ino_t id, Inode** inode);
 			Inode*			CreateRootInode();
 
-	inline	uint32			FHExpiryType() const;
-
 	inline	RPC::Server*	Server();
 	inline	NFS4Server*		NFSServer();
 
@@ -38,7 +36,7 @@ public:
 private:
 							Filesystem();
 
-			uint32			fFHExpiryType;
+			const char*		fPath;
 
 			Filehandle		fRootFH;
 

src/add-ons/kernel/file_systems/nfs4/Inode.cpp

@@ -20,8 +20,6 @@ Inode::Inode()
 }
 
 
-// Creating Inode object from Filehandle probably is not a good idea when
-// filehandles are volatile.
 status_t
 Inode::CreateInode(Filesystem* fs, const FileInfo &fi, Inode** _inode)
 {
@@ -33,7 +31,9 @@ Inode::CreateInode(Filesystem* fs, const FileInfo &fi, Inode** _inode)
 	inode->fFilesystem = fs;
 	inode->fParentFH = fi.fParent;
 	inode->fName = strdup(fi.fName);
+	inode->fPath = strdup(fi.fPath);
 
+	do {
 		Request request(fs->Server());
 		RequestBuilder& req = request.Builder();
 
@@ -48,6 +48,12 @@ Inode::CreateInode(Filesystem* fs, const FileInfo &fi, Inode** _inode)
 
 		ReplyInterpreter& reply = request.Reply();
 
+		// filehandle has expired
+		if (reply.NFS4Error() == NFS4ERR_FHEXPIRED) {
+			inode->_LookUpFilehandle();
+			continue;
+		}
+
 		result = reply.PutFH();
 		if (result != B_OK)
 			return result;
@@ -74,6 +80,7 @@ Inode::CreateInode(Filesystem* fs, const FileInfo &fi, Inode** _inode)
 		*_inode = inode;
 
 		return B_OK;
+	} while (true);
 }
 
 
@@ -94,6 +101,7 @@ Inode::LookUp(const char* name, ino_t* id)
 		return B_OK;
 	}
 
+	do {
 		Request request(fFilesystem->Server());
 		RequestBuilder& req = request.Builder();
 
@@ -115,6 +123,12 @@ Inode::LookUp(const char* name, ino_t* id)
 
 		ReplyInterpreter& reply = request.Reply();
 
+		// filehandle has expired
+		if (reply.NFS4Error() == NFS4ERR_FHEXPIRED) {
+			_LookUpFilehandle();
+			continue;
+		}
+
 		result = reply.PutFH();
 		if (result != B_OK)
 			return result;
@@ -145,9 +159,24 @@ Inode::LookUp(const char* name, ino_t* id)
 		delete[] values;
 
 		*id = _FileIdToInoT(fileId);
-	fFilesystem->InoIdMap()->AddEntry(fh, fHandle, name, fileId, *id);
+
+		FileInfo fi;
+		fi.fFileId = fileId;
+		fi.fFH = fh;
+		fi.fParent = fHandle;
+		fi.fName = strdup(name);
+
+		char* path = reinterpret_cast<char*>(malloc(strlen(name) + 2 +
+			strlen(fPath)));
+		strcpy(path, fPath);
+		strcat(path, "/");
+		strcat(path, name);
+		fi.fPath = path;
+
+		fFilesystem->InoIdMap()->AddEntry(fi, *id);
 
 		return B_OK;
+	} while (true);
 }
 
 
@@ -157,6 +186,7 @@ Inode::ReadLink(void* buffer, size_t* length)
 	if (fType != NF4LNK)
 		return B_BAD_VALUE;
 
+	do {
 		Request request(fFilesystem->Server());
 		RequestBuilder& req = request.Builder();
 
@@ -169,6 +199,12 @@ Inode::ReadLink(void* buffer, size_t* length)
 
 		ReplyInterpreter& reply = request.Reply();
 
+		// filehandle has expired
+		if (reply.NFS4Error() == NFS4ERR_FHEXPIRED) {
+			_LookUpFilehandle();
+			continue;
+		}
+
 		result = reply.PutFH();
 		if (result != B_OK)
 			return result;
@@ -178,12 +214,14 @@ Inode::ReadLink(void* buffer, size_t* length)
 		*length = static_cast<size_t>(size);
 
 		return result;
+	} while (true);
 }
 
 
 status_t
 Inode::Access(int mode)
 {
+	do {
 		Request request(fFilesystem->Server());
 		RequestBuilder& req = request.Builder();
 
@@ -196,6 +234,12 @@ Inode::Access(int mode)
 
 		ReplyInterpreter& reply = request.Reply();
 
+		// filehandle has expired
+		if (reply.NFS4Error() == NFS4ERR_FHEXPIRED) {
+			_LookUpFilehandle();
+			continue;
+		}
+
 		result = reply.PutFH();
 		if (result != B_OK)
 			return result;
@@ -222,12 +266,14 @@ Inode::Access(int mode)
 			return B_NOT_ALLOWED;
 
 		return B_OK;
+	} while (true);
 }
 
 
 status_t
 Inode::Stat(struct stat* st)
 {
+	do {
 		Request request(fFilesystem->Server());
 		RequestBuilder& req = request.Builder();
 
@@ -244,6 +290,12 @@ Inode::Stat(struct stat* st)
 
 		ReplyInterpreter& reply = request.Reply();
 
+		// filehandle has expired
+		if (reply.NFS4Error() == NFS4ERR_FHEXPIRED) {
+			_LookUpFilehandle();
+			continue;
+		}
+
 		result = reply.PutFH();
 		if (result != B_OK)
 			return result;
@@ -308,7 +360,8 @@ Inode::Stat(struct stat* st)
 			memset(&st->st_atim, 0, sizeof(timespec));
 
 		if (count >= next && values[next].fAttribute == FATTR4_TIME_CREATE) {
-		memcpy(&st->st_crtim, values[next].fData.fPointer, sizeof(timespec));
+			memcpy(&st->st_crtim, values[next].fData.fPointer,
+				sizeof(timespec));
 			next++;
 		} else
 			memset(&st->st_crtim, 0, sizeof(timespec));
@@ -330,6 +383,7 @@ Inode::Stat(struct stat* st)
 
 		delete[] values;
 		return B_OK;
+	} while (true);
 }
 
 
@@ -362,6 +416,12 @@ Inode::Open(int mode, OpenFileCookie* cookie)
 
 		ReplyInterpreter& reply = request.Reply();
 
+		// filehandle has expired
+		if (reply.NFS4Error() == NFS4ERR_FHEXPIRED) {
+			_LookUpFilehandle();
+			continue;
+		}
+
 		// server is in grace period, we need to wait
 		if (reply.NFS4Error() == NFS4ERR_GRACE) {
 			fFilesystem->NFSServer()->ReleaseCID(cookie->fClientId);
@@ -437,6 +497,12 @@ Inode::Close(OpenFileCookie* cookie)
 
 		ReplyInterpreter& reply = request.Reply();
 
+		// filehandle has expired
+		if (reply.NFS4Error() == NFS4ERR_FHEXPIRED) {
+			_LookUpFilehandle();
+			continue;
+		}
+
 		// server is in grace period, we need to wait
 		if (reply.NFS4Error() == NFS4ERR_GRACE) {
 			snooze_etc(fFilesystem->NFSServer()->LeaseTime() / 3,
@@ -483,6 +549,12 @@ Inode::Read(OpenFileCookie* cookie, off_t pos, void* buffer, size_t* _length)
 
 			ReplyInterpreter& reply = request.Reply();
 
+			// filehandle has expired
+			if (reply.NFS4Error() == NFS4ERR_FHEXPIRED) {
+				_LookUpFilehandle();
+				continue;
+			}
+
 			// server is in grace period, we need to wait
 			if (reply.NFS4Error() == NFS4ERR_GRACE) {
 				snooze_etc(fFilesystem->NFSServer()->LeaseTime() / 3,
@@ -524,6 +596,7 @@ Inode::OpenDir(uint64* cookie)
 	if (fType != NF4DIR)
 		return B_NOT_A_DIRECTORY;
 
+	do {
 		Request request(fFilesystem->Server());
 		RequestBuilder& req = request.Builder();
 
@@ -536,6 +609,12 @@ Inode::OpenDir(uint64* cookie)
 
 		ReplyInterpreter& reply = request.Reply();
 
+		// filehandle has expired
+		if (reply.NFS4Error() == NFS4ERR_FHEXPIRED) {
+			_LookUpFilehandle();
+			continue;
+		}
+
 		result = reply.PutFH();
 		if (result != B_OK)
 			return result;
@@ -552,6 +631,7 @@ Inode::OpenDir(uint64* cookie)
 		cookie[1] = 2;
 
 		return B_OK;
+	} while (true);
 }
 
 
@@ -559,6 +639,7 @@ status_t
 Inode::_ReadDirOnce(DirEntry** dirents, uint32* count, uint64* cookie,
 	bool* eof)
 {
+	do {
 		Request request(fFilesystem->Server());
 		RequestBuilder& req = request.Builder();
 
@@ -573,11 +654,18 @@ Inode::_ReadDirOnce(DirEntry** dirents, uint32* count, uint64* cookie,
 
 		ReplyInterpreter& reply = request.Reply();
 
+		// filehandle has expired
+		if (reply.NFS4Error() == NFS4ERR_FHEXPIRED) {
+			_LookUpFilehandle();
+			continue;
+		}
+
 		result = reply.PutFH();
 		if (result != B_OK)
 			return result;
 
 		return reply.ReadDir(cookie, dirents, count, eof);
+	} while (true);
 }
 
 
@@ -606,6 +694,7 @@ Inode::_FillDirEntry(struct dirent* de, ino_t id, const char* name, uint32 pos,
 status_t
 Inode::_ReadDirUp(struct dirent* de, uint32 pos, uint32 size)
 {
+	do {
 		Request request(fFilesystem->Server());
 		RequestBuilder& req = request.Builder();
 
@@ -621,6 +710,12 @@ Inode::_ReadDirUp(struct dirent* de, uint32 pos, uint32 size)
 
 		ReplyInterpreter& reply = request.Reply();
 
+		// filehandle has expired
+		if (reply.NFS4Error() == NFS4ERR_FHEXPIRED) {
+			_LookUpFilehandle();
+			continue;
+		}
+
 		result = reply.PutFH();
 		if (result != B_OK)
 			return result;
@@ -647,6 +742,7 @@ Inode::_ReadDirUp(struct dirent* de, uint32 pos, uint32 size)
 			fileId = values[0].fData.fValue64;
 
 		return _FillDirEntry(de, _FileIdToInoT(fileId), "..", pos, size);
+	} while (true);
 }
 
 // TODO: Currently inode numbers returned by ReadDir are virtually random.
@@ -726,3 +822,53 @@ Inode::ReadDir(void* _buffer, uint32 size, uint32* _count, uint64* cookie)
 	return B_OK;
 }
 
+
+status_t
+Inode::_LookUpFilehandle()
+{
+	Request request(fFilesystem->Server());
+	RequestBuilder& req = request.Builder();
+
+	req.PutRootFH();
+
+	uint32 lookupCount = 0;
+	char* path = strdup(fPath);
+	char* pathStart = path;
+	char* pathEnd;
+	while (pathStart != NULL) {
+		pathEnd = strpbrk(pathStart, "/");
+		if (pathEnd != NULL)
+			*pathEnd = '\0';
+
+		req.LookUp(pathStart);
+
+		if (pathEnd != NULL && pathEnd[1] != '\0')
+			pathStart = pathEnd + 1;
+		else
+			pathStart = NULL;
+
+		lookupCount++;
+	}
+	free(path);
+
+	req.GetFH();
+
+	status_t result = request.Send();
+	if (result != B_OK)
+		return result;
+
+	ReplyInterpreter& reply = request.Reply();
+
+	result = reply.PutRootFH();
+	if (result != B_OK)
+		return result;
+
+	for (uint32 i = 0; i < lookupCount; i++) {
+		result = reply.LookUp();
+		if (result != B_OK)
+			return result;
+	}
+
+	return reply.GetFH(&fHandle);
+}
+

src/add-ons/kernel/file_systems/nfs4/Inode.h

@@ -61,6 +61,8 @@ public:
 private:
 								Inode();
 
+					status_t	_LookUpFilehandle();
+
 					status_t	_ReadDirOnce(DirEntry** dirents, uint32* count,
 									uint64* cookie, bool* eof);
 					status_t	_FillDirEntry(struct dirent* de, ino_t id,
@@ -78,6 +80,8 @@ private:
 
 					Filehandle	fParentFH;
 					const char*	fName;
+
+					const char*	fPath;
 };
 
 

src/add-ons/kernel/file_systems/nfs4/InodeIdMap.h

@@ -17,9 +17,7 @@
 
 class InodeIdMap {
 public:
-	inline	status_t						AddEntry(const Filehandle& fh,
+	inline	status_t						AddEntry(const FileInfo& fi,
-												const Filehandle& parent,
-												const char* name, uint64 fileId,
 												ino_t id);
 	inline	status_t						GetFileInfo(FileInfo* fi, ino_t id);
 
@@ -30,14 +28,8 @@ private:
 
 
 inline status_t
-InodeIdMap::AddEntry(const Filehandle& fh, const Filehandle& parent,
+InodeIdMap::AddEntry(const FileInfo& fi, ino_t id)
-	const char* name, uint64 fileId, ino_t id)
 {
-	FileInfo fi;
-	fi.fFileId = fileId;
-	fi.fFH = fh;
-	fi.fParent = parent;
-	fi.fName = strdup(name);
 	return fMap.Insert(id, fi);
 }