nfs4: Basic data cache implementation

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

@@ -12,6 +12,7 @@
 #include <ctype.h>
 #include <string.h>
 
+#include <fs_cache.h>
 #include <NodeMonitor.h>
 
 #include "IdMap.h"
@@ -22,7 +23,8 @@
 Inode::Inode()
 	:
 	fAttrCacheExpire(0),
-	fCache(NULL)
+	fCache(NULL),
+	fFileCache(NULL)
 {
 	mutex_init(&fAttrCacheLock, NULL);
 }
@@ -43,6 +45,7 @@ Inode::CreateInode(FileSystem* fs, const FileInfo &fi, Inode** _inode)
 	inode->fInfo = fi;
 	inode->fFileSystem = fs;
 
+	uint64 size;
 	do {
 		RPC::Server* serv = fs->Server();
 		Request request(serv);
@@ -50,7 +53,8 @@ Inode::CreateInode(FileSystem* fs, const FileInfo &fi, Inode** _inode)
 
 		req.PutFH(inode->fInfo.fHandle);
 
-		Attribute attr[] = { FATTR4_TYPE, FATTR4_FSID, FATTR4_FILEID };
+		Attribute attr[] = { FATTR4_TYPE, FATTR4_SIZE, FATTR4_FSID,
+			FATTR4_FILEID };
 		req.GetAttr(attr, sizeof(attr) / sizeof(Attribute));
 
 		status_t result = request.Send();
@@ -67,14 +71,14 @@ Inode::CreateInode(FileSystem* fs, const FileInfo &fi, Inode** _inode)
 		AttrValue* values;
 		uint32 count;
 		result = reply.GetAttr(&values, &count);
-		if (result != B_OK || count < 2)
+		if (result != B_OK || count < 3)
 			return result;
 
 		if (fi.fFileId == 0) {
-			if (count < 3 || values[2].fAttribute != FATTR4_FILEID)
+			if (count < 4 || values[3].fAttribute != FATTR4_FILEID)
 				inode->fInfo.fFileId = fs->AllocFileId();
 			else
-				inode->fInfo.fFileId = values[2].fData.fValue64;
+				inode->fInfo.fFileId = values[3].fData.fValue64;
 		} else
 			inode->fInfo.fFileId = fi.fFileId;
 
@@ -84,9 +88,12 @@ Inode::CreateInode(FileSystem* fs, const FileInfo &fi, Inode** _inode)
 		if (inode->fType == NF4DIR)
 			inode->fCache = new DirectoryCache(inode);
 
+		// FATTR4_SIZE is mandatory
+		size = values[1].fData.fValue64;
+
 		// FATTR4_FSID is mandatory
 		FileSystemId* fsid =
-			reinterpret_cast<FileSystemId*>(values[1].fData.fPointer);
+			reinterpret_cast<FileSystemId*>(values[2].fData.fPointer);
 		if (*fsid != fs->FsId()) {
 			delete[] values;
 			return B_ENTRY_NOT_FOUND;
@@ -96,13 +103,21 @@ Inode::CreateInode(FileSystem* fs, const FileInfo &fi, Inode** _inode)
 
 		*_inode = inode;
 
-		return B_OK;
+		break;
 	} while (true);
+
+	if (inode->fType == NF4REG)
+		inode->fFileCache = file_cache_create(fs->DevId(), inode->ID(), size);
+
+	return B_OK;
 }
 
 
 Inode::~Inode()
 {
+	if (fFileCache != NULL)
+		file_cache_delete(fFileCache);
+
 	delete fCache;
 	mutex_destroy(&fAttrCacheLock);
 }

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

@@ -30,6 +30,8 @@ public:
 	inline			const char*	Name() const;
 	inline			FileSystem*	GetFileSystem() const;
 
+	inline			void*		FileCache();
+
 					status_t	GetChangeInfo(uint64* change);
 
 					status_t	LookUp(const char* name, ino_t* id);
@@ -52,7 +54,7 @@ public:
 					status_t	Open(int mode, OpenFileCookie* cookie);
 					status_t	Close(OpenFileCookie* cookie);
 					status_t	Read(OpenFileCookie* cookie, off_t pos,
-									void* buffer, size_t* length);
+									void* buffer, size_t* length, bool* eof);
 					status_t	Write(OpenFileCookie* cookie, off_t pos,
 									const void* buffer, size_t *_length);
 
@@ -111,6 +113,7 @@ protected:
 					FileSystem*	fFileSystem;
 
 					DirectoryCache*	fCache;
+					void*		fFileCache;
 };
 
 
@@ -153,5 +156,12 @@ Inode::GetFileSystem() const
 }
 
 
+inline void*
+Inode::FileCache()
+{
+	return fFileCache;
+}
+
+
 #endif	// INODE_H
 

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

@@ -11,6 +11,7 @@
 
 #include <string.h>
 
+#include <fs_cache.h>
 #include <NodeMonitor.h>
 
 #include "IdMap.h"
@@ -330,13 +331,14 @@ Inode::Close(OpenFileCookie* cookie)
 
 
 status_t
-Inode::Read(OpenFileCookie* cookie, off_t pos, void* buffer, size_t* _length)
+Inode::Read(OpenFileCookie* cookie, off_t pos, void* buffer, size_t* _length,
+	bool* eof)
 {
-	bool eof = false;
+	*eof = false;
 	uint32 size = 0;
 	uint32 len = 0;
 
-	while (size < *_length && !eof) {
+	while (size < *_length && !*eof) {
 		do {
 			RPC::Server* serv = fFileSystem->Server();
 			Request request(serv);
@@ -357,7 +359,7 @@ Inode::Read(OpenFileCookie* cookie, off_t pos, void* buffer, size_t* _length)
 
 			reply.PutFH();
 			result = reply.Read(reinterpret_cast<char*>(buffer) + size, &len,
-						&eof);
+						eof);
 			if (result != B_OK)
 				return result;
 

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

@@ -16,7 +16,8 @@
 
 RootInode::RootInode()
 	:
-	fInfoCacheExpire(0)
+	fInfoCacheExpire(0),
+	fIOSize(0)
 {
 	mutex_init(&fInfoCacheLock, NULL);
 }
@@ -90,29 +91,30 @@ RootInode::_UpdateInfo(bool force)
 			next++;
 		}
 
-		uint64 io_size = LONGLONG_MAX;
+		uint64 ioSize = LONGLONG_MAX;
 		if (count >= next && values[next].fAttribute == FATTR4_MAXREAD) {
-			io_size = min_c(io_size, values[next].fData.fValue64);
+			ioSize = min_c(ioSize, values[next].fData.fValue64);
 			next++;
 		}
 
 		if (count >= next && values[next].fAttribute == FATTR4_MAXWRITE) {
-			io_size = min_c(io_size, values[next].fData.fValue64);
+			ioSize = min_c(ioSize, values[next].fData.fValue64);
 			next++;
 		}
 
-		if (io_size == LONGLONG_MAX)
-			io_size = 32768;
-		fInfoCache.io_size = io_size;
-		fInfoCache.block_size = io_size;
+		if (ioSize == LONGLONG_MAX)
+			ioSize = 32768;
+		fInfoCache.io_size = ioSize;
+		fInfoCache.block_size = ioSize;
+		fIOSize = ioSize;
 
 		if (count >= next && values[next].fAttribute == FATTR4_SPACE_FREE) {
-			fInfoCache.free_blocks = values[next].fData.fValue64 / io_size;
+			fInfoCache.free_blocks = values[next].fData.fValue64 / ioSize;
 			next++;
 		}
 
 		if (count >= next && values[next].fAttribute == FATTR4_SPACE_TOTAL) {
-			fInfoCache.total_blocks = values[next].fData.fValue64 / io_size;
+			fInfoCache.total_blocks = values[next].fData.fValue64 / ioSize;
 			next++;
 		}
 

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

@@ -22,6 +22,8 @@ public:
 			status_t			ReadInfo(struct fs_info* info);
 	inline	void				MakeInfoInvalid();
 
+	inline	uint32				IOSize();
+
 			bool				ProbeMigration();
 			status_t			GetLocations(AttrValue** attr);
 
@@ -30,6 +32,8 @@ private:
 			mutex				fInfoCacheLock;
 			time_t				fInfoCacheExpire;
 
+			uint32				fIOSize;
+
 			status_t			_UpdateInfo(bool force = false);
 
 };
@@ -42,5 +46,14 @@ RootInode::MakeInfoInvalid()
 }
 
 
+inline uint32
+RootInode::IOSize()
+{
+	if (fIOSize == 0)
+		_UpdateInfo(true);
+	return fIOSize;
+}
+
+
 #endif	// ROOTINODE_H
 

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

@@ -9,6 +9,7 @@
 
 #include <stdio.h>
 
+#include <fs_cache.h>
 #include <fs_interface.h>
 
 #include "Connection.h"
@@ -212,6 +213,59 @@ nfs4_remove_vnode(fs_volume* volume, fs_vnode* vnode, bool reenter)
 }
 
 
+static status_t
+nfs4_read_pages(fs_volume* _volume, fs_vnode* vnode, void* _cookie, off_t pos,
+	const iovec* vecs, size_t count, size_t* _numBytes)
+{
+	Inode* inode = reinterpret_cast<Inode*>(vnode->private_node);
+	OpenFileCookie* cookie = reinterpret_cast<OpenFileCookie*>(_cookie);
+
+	status_t result;
+	bool eof = false;
+	for (size_t i = 0; i < count && !eof; i++) {
+		size_t bytesLeft = vecs[i].iov_len;
+		char* buffer = reinterpret_cast<char*>(vecs[i].iov_base);
+
+		do {
+			size_t bytesRead = bytesLeft;
+			result = inode->Read(cookie, pos, buffer, &bytesRead, &eof);
+			if (result != B_OK)
+				return result;
+
+			pos += bytesRead;
+			buffer += bytesRead;
+			bytesLeft -= bytesRead;
+		} while (bytesLeft > 0 && !eof);
+	}
+
+	return B_OK;
+}
+
+
+static status_t
+nfs4_write_pages(fs_volume* _volume, fs_vnode* vnode, void* _cookie, off_t pos,
+	const iovec* vecs, size_t count, size_t* _numBytes)
+{
+	return B_OK;
+}
+
+
+static status_t
+nfs4_io(fs_volume* volume, fs_vnode* vnode, void* cookie, io_request* request)
+{
+	// no asynchronous calls yet
+	return B_UNSUPPORTED;
+}
+
+
+static status_t
+nfs4_get_file_map(fs_volume* volume, fs_vnode* vnode, off_t _offset,
+	size_t size, struct file_io_vec* vecs, size_t* _count)
+{
+	return B_ERROR;
+}
+
+
 static status_t
 nfs4_set_flags(fs_volume* volume, fs_vnode* vnode, void* _cookie, int flags)
 {
@@ -224,7 +278,7 @@ nfs4_set_flags(fs_volume* volume, fs_vnode* vnode, void* _cookie, int flags)
 static status_t
 nfs4_fsync(fs_volume* volume, fs_vnode* vnode)
 {
-	// Currently, there is no cache and all writes are FILE_SYNC4
+	// Currently all writes are FILE_SYNC4
 	return B_OK;
 }
 
@@ -378,7 +432,7 @@ nfs4_free_cookie(fs_volume* volume, fs_vnode* vnode, void* _cookie)
 
 
 static status_t
-nfs4_read(fs_volume* volume, fs_vnode* vnode, void* _cookie, off_t pos,
+nfs4_read(fs_volume* volume, fs_vnode* vnode, void* cookie, off_t pos,
 	void* buffer, size_t* length)
 {
 	Inode* inode = reinterpret_cast<Inode*>(vnode->private_node);
@@ -389,15 +443,13 @@ nfs4_read(fs_volume* volume, fs_vnode* vnode, void* _cookie, off_t pos,
 	if (inode->Type() == S_IFLNK)
 		return B_BAD_VALUE;
 
-	OpenFileCookie* cookie = reinterpret_cast<OpenFileCookie*>(_cookie);
-
-	return inode->Read(cookie, pos, buffer, length);
+	return file_cache_read(inode->FileCache(), cookie, pos, buffer, length);
 }
 
 
 static status_t
 nfs4_write(fs_volume* volume, fs_vnode* vnode, void* _cookie, off_t pos,
-	const void* buffer, size_t* length)
+	const void* _buffer, size_t* length)
 {
 	Inode* inode = reinterpret_cast<Inode*>(vnode->private_node);
 
@@ -409,7 +461,40 @@ nfs4_write(fs_volume* volume, fs_vnode* vnode, void* _cookie, off_t pos,
 
 	OpenFileCookie* cookie = reinterpret_cast<OpenFileCookie*>(_cookie);
 
-	return inode->Write(cookie, pos, buffer, length);
+	struct stat stat;
+	status_t result = inode->Stat(&stat);
+	if (result != B_OK)
+		return result;
+
+	uint64 fileSize = max_c(stat.st_size, pos + *length);
+	result = file_cache_set_size(inode->FileCache(), fileSize);
+	if (result != B_OK)
+		return result;
+
+	result = file_cache_write(inode->FileCache(), cookie, pos, _buffer,
+		length);
+	if (result != B_OK)
+		return result;
+
+	uint32 ioSize = inode->GetFileSystem()->Root()->IOSize();
+	size_t bytesLeft = *length;
+	const char* buffer = reinterpret_cast<const char*>(_buffer);
+	do {
+		size_t bytesWritten = min_c(ioSize, bytesLeft);
+		result = inode->Write(cookie, pos, buffer, &bytesWritten);
+		if (result != B_OK)
+			break;
+
+		bytesLeft -= bytesWritten;
+		pos += bytesWritten;
+		buffer += bytesWritten;
+	} while (bytesLeft > 0);
+
+	if (bytesLeft == *length)
+		return result;
+
+	*length = *length - bytesLeft;
+	return B_OK;
 }
 
 
@@ -582,13 +667,13 @@ fs_vnode_ops gNFSv4VnodeOps = {
 
 	/* VM file access */
 	NULL,	// can_page()
-	NULL,	// read_pages()
-	NULL,	// write_pages()
+	nfs4_read_pages,
+	nfs4_write_pages,
 
-	NULL,	// io()
+	nfs4_io,
 	NULL,	// cancel_io()
 
-	NULL,	// get_file_map()
+	nfs4_get_file_map,
 
 	NULL,	// ioctl()
 	nfs4_set_flags,