* Added stat::st_blocks field as required by POSIX. This also closes ticket

#2261.
* Made at least BFS report it more or less correctly (the attributes are
  ignored, though).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@27791 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/posix/sys/stat.h

@@ -10,15 +10,15 @@
 
 
 struct stat {
-	dev_t			st_dev;			/* "device" that this file resides on */
-	ino_t			st_ino;			/* this file's inode #, unique per device */
-	mode_t			st_mode;		/* mode bits (rwx for user, group, etc) */
+	dev_t			st_dev;			/* device ID that this file resides on */
+	ino_t			st_ino;			/* this file's serial inode ID */
+	mode_t			st_mode;		/* file mode (rwx for user, group, etc) */
 	nlink_t			st_nlink;		/* number of hard links to this file */
-	uid_t			st_uid;			/* user id of the owner of this file */
-	gid_t			st_gid;			/* group id of the owner of this file */
+	uid_t			st_uid;			/* user ID of the owner of this file */
+	gid_t			st_gid;			/* group ID of the owner of this file */
 	off_t			st_size;		/* size in bytes of this file */
 	dev_t			st_rdev;		/* device type (not used) */
-	size_t			st_blksize;		/* preferred block size for i/o */
+	blksize_t		st_blksize;		/* preferred block size for I/O */
 	time_t			st_atime;		/* last access time */
 	time_t			st_mtime;		/* last modification time */
 	time_t			st_ctime;		/* last change time, not creation time */
@@ -29,6 +29,7 @@ struct stat {
 	 * TODO: we should find another solution for this, as BStatable::GetStat()
 	 *		can only retrieve the R5 stat structure */
 	unsigned int	st_type;		/* attribute/index type */
+	blkcnt_t		st_blocks;		/* number of blocks allocated for object */
 };
 
 /* extended file types */

headers/private/fs_shell/fssh_api_wrapper.h

@@ -1224,6 +1224,7 @@
 #define st_ctime	fssh_st_ctime
 #define st_crtime	fssh_st_crtime
 #define st_type		fssh_st_type
+#define st_blocks	fssh_st_blocks
 
 /* extended file types */
 #define S_ATTR_DIR			FSSH_S_ATTR_DIR

headers/private/fs_shell/fssh_stat.h

@@ -30,6 +30,7 @@ struct fssh_stat {
 	// TODO: we should find another solution for this, as BStatable::GetStat()
 	//		can only retrieve the R5 stat structure
 	unsigned int		fssh_st_type;		/* attribute/index type */
+	fssh_off_t			fssh_st_blocks;		/* number of blocks allocated for object */
 };
 typedef struct fssh_stat fssh_struct_stat;
 

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

@@ -1275,6 +1275,48 @@ Inode::IsEmpty()
 //	#pragma mark - data stream
 
 
+/*!	Computes the number of bytes this inode occupies in the file system.
+	This includes the file meta blocks used for maintaining its data stream.
+
+	TODO: However, the attributes in extra files are not really accounted for;
+	depending on the speed penalty, this should be changed, though (the value
+	could be cached in the inode structure or Inode object, though).
+*/
+off_t
+Inode::AllocatedSize() const
+{
+	if (IsSymLink() && (Flags() & INODE_LONG_SYMLINK) == 0) {
+		// This symlink does not have a data stream
+		return Node().InodeSize();
+	}
+
+	const data_stream& data = Node().data;
+	uint32 blockSize = fVolume->BlockSize();
+	off_t size = blockSize;
+
+	if (data.MaxDoubleIndirectRange() != 0) {
+		off_t doubleIndirectSize = data.MaxDoubleIndirectRange()
+			- data.MaxIndirectRange();
+		int32 indirectSize = (1L << (INDIRECT_BLOCKS_SHIFT
+				+ fVolume->BlockShift())) * (blockSize / sizeof(block_run));
+
+		size += (2 * NUM_ARRAY_BLOCKS + doubleIndirectSize / indirectSize)
+			* blockSize + data.MaxDoubleIndirectRange();
+	} else if (data.MaxIndirectRange() != 0)
+		size += NUM_ARRAY_BLOCKS + data.MaxIndirectRange();
+	else
+		size += data.MaxDirectRange();
+
+	if (!Node().attributes.IsZero()) {
+		// TODO: to make this exact, we'd had to count all attributes
+		size += 2 * blockSize;
+			// 2 blocks, one for the attributes inode, one for its B+tree
+	}
+
+	return size;
+}
+
+
 /*!	Finds the block_run where "pos" is located in the data_stream of
 	the inode.
 	If successful, "offset" will then be set to the file offset

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

@@ -76,8 +76,9 @@ public:
 			int32			Flags() const { return fNode.Flags(); }
 
 			off_t			Size() const { return fNode.data.Size(); }
+			off_t			AllocatedSize() const;
 			off_t			LastModified() const
-								{ return fNode.last_modified_time; }
+								{ return fNode.LastModifiedTime(); }
 
 			const block_run& BlockRun() const
 								{ return fNode.inode_num; }

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

@@ -50,11 +50,14 @@ fill_stat_buffer(Inode* inode, struct stat& stat)
 	stat.st_mtime = stat.st_ctime = (time_t)(node.LastModifiedTime() >> INODE_TIME_SHIFT);
 	stat.st_crtime = (time_t)(node.CreateTime() >> INODE_TIME_SHIFT);
 
-	if (inode->IsSymLink() && (node.Flags() & INODE_LONG_SYMLINK) == 0) {
+	if (inode->IsSymLink() && (inode->Flags() & INODE_LONG_SYMLINK) == 0) {
 		// symlinks report the size of the link here
 		stat.st_size = strlen(node.short_symlink);
 	} else
 		stat.st_size = inode->Size();
+
+	stat.st_blocks = inode->AllocatedSize() / node.InodeSize();
+		// TODO: decide for a unit to use for st_blocks!
 }