nfs4: Add basic nfs4_read_stat() procedure

Not all data are retrieved and there is a room for improvement in handling
situations when server does not provide necessary information.

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

@@ -56,3 +56,54 @@ Inode::Inode(Filesystem* fs, const Filehandle &fh)
 	delete values;
 }
 
+
+status_t
+Inode::Stat(struct stat* st)
+{
+	RequestBuilder req(ProcCompound);
+	req.PutFH(fHandle);
+
+	Attribute attr[] = { FATTR4_SIZE, FATTR4_MODE, FATTR4_NUMLINKS };
+	req.GetAttr(attr, sizeof(attr) / sizeof(Attribute));
+
+	RPC::Reply *rpl;
+	fFilesystem->Server()->SendCall(req.Request(), &rpl);
+	ReplyInterpreter reply(rpl);
+
+	status_t result;
+	result = reply.PutFH();
+	if (result != B_OK)
+		return result;
+
+	AttrValue* values;
+	uint32 count;
+	result = reply.GetAttr(&values, &count);
+	if (result != B_OK)
+		return result;
+
+	// FATTR4_SIZE is mandatory
+	if (count < 1 || values[0].fAttribute != FATTR4_SIZE)
+		return B_BAD_VALUE;
+	st->st_size = values[0].fData.fValue64;
+
+	uint32 next = 1;
+	st->st_mode = Type();
+	if (count >= next && values[next].fAttribute == FATTR4_MODE) {
+		st->st_mode |= values[next].fData.fValue32;
+		next++;
+	}
+	// TODO: else: get some info from ACCESS
+
+	if (count >= next && values[next].fAttribute == FATTR4_NUMLINKS) {
+		st->st_nlink = values[next].fData.fValue32;
+		next++;
+	} else
+		st->st_nlink = 1;	// TODO: if !link_support we dont have to ask
+
+	st->st_uid = 0;
+	st->st_gid = 0;
+
+	delete values;
+	return B_OK;
+}
+

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

@@ -9,6 +9,8 @@
 #define INODE_H
 
 
+#include <sys/stat.h>
+
 #include <SupportDefs.h>
 
 #include "Filesystem.h"
@@ -22,6 +24,8 @@ public:
 	inline	ino_t		ID() const;
 	inline	mode_t		Type() const;
 
+			status_t	Stat(struct stat* st);
+
 private:
 			uint64		fFileId;
 			uint32		fType;

src/add-ons/kernel/file_systems/nfs4/NFS4Defs.h

@@ -119,8 +119,8 @@ enum FileType {
 };
 
 static const mode_t sNFSFileTypeToHaiku[] = {
-	S_IFREG, S_IFDIR, S_IFBLK, S_IFCHR, S_IFLNK, S_IFSOCK, S_IFIFO, S_IFDIR,
-	S_IFREG
+	S_IFREG, S_IFREG, S_IFDIR, S_IFBLK, S_IFCHR, S_IFLNK, S_IFSOCK, S_IFIFO,
+	S_IFDIR, S_IFREG
 };
 
 enum FileHandleExpiryType {

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

@@ -83,7 +83,7 @@ ReplyInterpreter::GetAttr(AttrValue** attrs, uint32* count)
 	uint32 attr_count = 0;
 	for (uint32 i = 0; i < bcount; i++) {
 		bitmap[i] = fReply->Stream().GetUInt();
-		attr_count = sCountBits(bitmap[i]);
+		attr_count += sCountBits(bitmap[i]);
 	}
 
 	uint32 size;
@@ -110,12 +110,30 @@ ReplyInterpreter::GetAttr(AttrValue** attrs, uint32* count)
 		current++;
 	}
 
+	if (sIsAttrSet(FATTR4_SIZE, bitmap, bcount)) {
+		values[current].fAttribute = FATTR4_SIZE;
+		values[current].fData.fValue64 = stream.GetUHyper();
+		current++;
+	}
+
 	if (sIsAttrSet(FATTR4_FILEID, bitmap, bcount)) {
 		values[current].fAttribute = FATTR4_FILEID;
 		values[current].fData.fValue64 = stream.GetUHyper();
 		current++;
 	}
 
+	if (sIsAttrSet(FATTR4_MODE, bitmap, bcount)) {
+		values[current].fAttribute = FATTR4_MODE;
+		values[current].fData.fValue32 = stream.GetUInt();
+		current++;
+	}
+
+	if (sIsAttrSet(FATTR4_NUMLINKS, bitmap, bcount)) {
+		values[current].fAttribute = FATTR4_NUMLINKS;
+		values[current].fData.fValue32 = stream.GetUInt();
+		current++;
+	}
+
 	delete bitmap;
 
 	*count = attr_count;

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

@@ -79,6 +79,14 @@ nfs4_put_vnode(fs_volume* volume, fs_vnode* vnode, bool reenter)
 }
 
 
+static status_t
+nfs4_read_stat(fs_volume* volume, fs_vnode* vnode, struct stat* stat)
+{
+	Inode* inode = reinterpret_cast<Inode*>(vnode->private_node);
+	return inode->Stat(stat);
+}
+
+
 status_t
 nfs4_init()
 {
@@ -130,7 +138,34 @@ fs_volume_ops gNFSv4VolumeOps = {
 fs_vnode_ops gNFSv4VnodeOps = {
 	NULL,	// lookup()
 	NULL,	// get_vnode_name()
-	&nfs4_put_vnode
+	&nfs4_put_vnode,
+	NULL,	// remove_vnode()
+
+	/* VM file access */
+	NULL,	// can_page()
+	NULL,	// read_pages()
+	NULL,	// write_pages()
+
+	NULL,	// io()
+	NULL,	// cancel_io()
+
+	NULL,	// get_file_map()
+
+	NULL,	// ioctl()
+	NULL,
+	NULL,	// fs_select()
+	NULL,	// fs_deselect()
+	NULL,	// fsync()
+
+	NULL,	// read_link()
+	NULL,	// create_symlink()
+
+	NULL,	// link()
+	NULL,	// unlink()
+	NULL,	// rename()
+
+	NULL,	// access()
+	&nfs4_read_stat,
 };
 
 static file_system_module_info sNFSv4ModuleInfo = {