xfs: get_vnode and read_stat hook

This patch aimed at implementing the get_vnode and read_stat hook.
read_stat seems to work well, get_vnode can be checked after working on
dir.

Change-Id: I487915b7e8f6ee6f97349b0c638676d5389cd2df
Reviewed-on: https://review.haiku-os.org/c/haiku/+/2859
Reviewed-by: Chế Vũ Gia Hy <cvghy116@gmail.com>
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>

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

@@ -1,3 +1,8 @@
+/*
+* Copyright 2020, Shubham Bhagat, shubhambhagat111@yahoo.com
+* All rights reserved. Distributed under the terms of the MIT License.
+*/
+
 #include "Inode.h"
 
 
@@ -31,6 +36,20 @@ xfs_inode::SwapEndian()
 }
 
 
+xfs_rfsblock_t
+xfs_inode::NoOfBlocks() const
+{
+	return di_nblocks;
+}
+
+
+xfs_fsize_t
+xfs_inode::Size() const
+{
+	return di_size;
+}
+
+
 mode_t
 xfs_inode::Mode()
 {
@@ -38,6 +57,72 @@ xfs_inode::Mode()
 }
 
 
+uint32
+xfs_inode::UserId()
+{
+	return di_uid;
+}
+
+
+uint32
+xfs_inode::GroupId()
+{
+	return di_gid;
+}
+
+
+void
+xfs_inode::GetModificationTime(struct timespec& stamp)
+{
+	stamp.tv_sec = di_mtime.t_sec;
+	stamp.tv_nsec = di_mtime.t_nsec;
+}
+
+
+void
+xfs_inode::GetAccessTime(struct timespec& stamp)
+{
+	stamp.tv_sec = di_atime.t_sec;
+	stamp.tv_nsec = di_atime.t_nsec;
+}
+
+
+void
+xfs_inode::GetChangeTime(struct timespec& stamp)
+{
+	stamp.tv_sec = di_ctime.t_sec;
+	stamp.tv_nsec = di_ctime.t_nsec;
+}
+
+
+uint32
+xfs_inode::NLink()
+{
+	return di_nlink;
+}
+
+
+int8
+xfs_inode::Version()
+{
+	return di_version;
+}
+
+
+uint16
+xfs_inode::Flags()
+{
+	return di_flags;
+}
+
+
+int8
+xfs_inode::Format()
+{
+	return di_format;
+}
+
+
 Inode::Inode(Volume* volume, xfs_ino_t id)
 {
 	fVolume = volume;

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

@@ -55,10 +55,18 @@ typedef enum xfs_dinode_fmt
 typedef struct xfs_inode
 {
 		void				SwapEndian();
-		void				DirIsV2();		//TODO
+		int8				Version();		//TODO
 		mode_t				Mode();
-		void				GetModificationTime();
+		void				GetModificationTime(struct timespec& timestamp);
+		void				GetChangeTime(struct timespec& timestamp);
+		void				GetAccessTime(struct timespec& timestamp);
 		int8				Format();		// The format of the inode
+		xfs_fsize_t			Size() const;	// TODO
+		xfs_rfsblock_t		NoOfBlocks() const;
+		uint32				NLink();
+		uint16				Flags();
+		uint32				UserId();
+		uint32				GroupId();
 
 		uint16				di_magic;
 		uint16				di_mode;		// uses standard S_Ixxx
@@ -97,6 +105,9 @@ class Inode
 					Inode(Volume* volume, xfs_ino_t id);
 					~Inode();
 		bool		InitCheck();
+
+		xfs_ino_t	ID() const { return fId; }
+
 		bool		IsDirectory() const
 						{ return S_ISDIR(Mode()); }
 
@@ -114,27 +125,28 @@ class Inode
 
 		bool		IsLocal() { return Format() == XFS_DINODE_FMT_LOCAL; }
 
-	#if 0
-		int32		Flags() const { return fNode->Flags(); }
+		uint32		NLink() { return fNode->NLink(); }
 
-		off_t		Size() const { return fNode->Size(); }
+		int8		Version() { return fNode->Version(); }
 
-		void		GetChangeTime(xfs_timestamp_t *stamp) const
-					{ fNode.GetChangeTime(stamp, fHasExtraAttributes); }
+		xfs_fsize_t	Size() const { return fNode->Size(); }
 
-		void		GetModificationTime(xfs_timestamp_t *stamp) const
-					{ fNode.GetModificationTime(stamp,
-						fHasExtraAttributes); }
+		xfs_rfsblock_t	NoOfBlocks() const { return fNode->NoOfBlocks(); }
 
-		void		GetCreationTime(xfs_timestamp_t *stamp) const
-					{ fNode.GetCreationTime(stamp,
-						fHasExtraAttributes); }
+		int16		Flags() const { return fNode->Flags(); }
 
-		void		GetAccessTime(xfs_timestamp_t *stamp) const
-					{ fNode.GetAccessTime(stamp, fHasExtraAttributes); }
-	#endif
+		void		GetChangeTime(struct timespec& timestamp) const
+					{ fNode->GetChangeTime(timestamp); }
+
+		void		GetModificationTime(struct timespec& timestamp) const
+					{ fNode->GetModificationTime(timestamp); }
+
+		void		GetAccessTime(struct timespec& timestamp) const
+					{ fNode->GetAccessTime(timestamp); }
 
 	private:
+		uint32		UserId() { return fNode->UserId(); }
+		uint32		GroupId() { return fNode->GroupId(); }
 
 		status_t			GetFromDisk();
 		xfs_inode_t*		fNode;

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

@@ -1,9 +1,10 @@
 /*
- * Copyright 2001-2017, Axel Dörfler, axeld@pinc-software.de.
- * Copyright 2020, Shubham Bhagat, shubhambhagat111@yahoo.com
- * All rights reserved. Distributed under the terms of the MIT License.
- */
+* Copyright 2001-2017, Axel Dörfler, axeld@pinc-software.de.
+* Copyright 2020, Shubham Bhagat, shubhambhagat111@yahoo.com
+* All rights reserved. Distributed under the terms of the MIT License.
+*/
 #include "system_dependencies.h"
+#include "Inode.h"
 #include "Volume.h"
 
 
@@ -12,8 +13,8 @@
 struct identify_cookie
 {
 	/*	super_block_struct super_block;
-	 *	No structure yet implemented.
-	 */
+	*	No structure yet implemented.
+	*/
 	int cookie;
 };
 
@@ -85,11 +86,17 @@ xfs_mount(fs_volume *_volume, const char *device, uint32 flags,
 		return status;
 	}
 
-/* Don't have Inodes yet */
-#if 0
-	 *_rootID = volume->Root()->ID();
-#endif
+	//publish the root inode
+	Inode* rootInode = new(std::nothrow) Inode(volume, volume->Root());
+	if (rootInode != NULL) {
+		status = publish_vnode(volume->FSVolume(), volume->Root(),
+			(void*)rootInode, &gxfsVnodeOps, rootInode->Mode(), 0);
 
+		if (status!=B_OK)
+			return B_BAD_VALUE;
+	}
+
+	*_rootID = volume->Root();
 	return B_OK;
 }
 
@@ -101,7 +108,6 @@ xfs_unmount(fs_volume *_volume)
 
 	status_t status = volume->Unmount();
 	delete volume;
-	
 	TRACE("xfs_unmount(): Deleted volume");
 	return status;
 }
@@ -134,7 +140,26 @@ static status_t
 xfs_get_vnode(fs_volume *_volume, ino_t id, fs_vnode *_node, int *_type,
 	uint32 *_flags, bool reenter)
 {
-	return B_NOT_SUPPORTED;
+	Volume* volume = (Volume*)_volume->private_volume;
+
+	Inode* inode = new(std::nothrow) Inode(volume, id);
+
+	if (inode == NULL)
+		return B_NO_MEMORY;
+
+	status_t status = inode->InitCheck();
+	if (status == false) {
+		delete inode;
+		ERROR("get_vnode: InitCheck() failed. Error: %s\n", strerror(status));
+		return B_NO_INIT;
+	}
+
+	_node->private_node = inode;
+	_node->ops = &gxfsVnodeOps;
+	*_type = inode->Mode();
+	*_flags = 0;
+
+	return B_OK;
 }
 
 
@@ -198,7 +223,29 @@ xfs_ioctl(fs_volume *_volume, fs_vnode *_node, void *_cookie, uint32 cmd,
 static status_t
 xfs_read_stat(fs_volume *_volume, fs_vnode *_node, struct stat *stat)
 {
-	return B_NOT_SUPPORTED;
+	Inode* inode = (Inode*)_node->private_node;
+	stat->st_dev = inode->GetVolume()->ID();
+	stat->st_ino = inode->ID();
+	stat->st_nlink = 1;
+	stat->st_blksize = XFS_IO_SIZE;
+
+	stat->st_uid = inode->UserId();
+	stat->st_gid = inode->GroupId();
+	stat->st_mode = inode->Mode();
+	stat->st_type = 0;	// TODO
+
+	stat->st_size = inode->GetVolume()->InodeSize();
+	stat->st_blocks = inode->NoOfBlocks();
+
+	inode->GetAccessTime(stat->st_atim);
+	inode->GetModificationTime(stat->st_mtim);
+	inode->GetChangeTime(stat->st_ctim);
+
+	/* TODO: Can we obtain the Creation Time in v4 system? */
+	inode->GetChangeTime(stat->st_crtim);
+
+	return B_OK;
+
 }