HGFS: statvfs support

servers/hgfs/const.h

@@ -6,7 +6,7 @@
 /* Number of entries in the name hashtable. */
 #define NUM_HASH_SLOTS	1023
 
-/* Arbitrary block size constant returned by fstatfs. du(1) uses this.
+/* Arbitrary block size constant returned by fstatfs and statvfs.
  * Also used by getdents. This is not the actual HGFS data transfer unit size.
  */
 #define BLOCK_SIZE	4096

servers/hgfs/inode.h

@@ -72,7 +72,6 @@ struct inode {
 #define i_file		i_u.u_file
 #define i_dir		i_u.u_dir
 
-
 #define I_DIR		0x01		/* this inode represents a directory */
 #define I_HANDLE	0x02		/* this inode has an open handle */
 

servers/hgfs/misc.c

@@ -1,7 +1,8 @@
-/* This file contains miscellaneous file system call handlers.
+* This file contains miscellaneous file system call handlers.
  *
  * The entry points into this file are:
  *   do_fstatfs		perform the FSTATFS file system call
+ *   do_statvfs		perform the STATVFS file system call
  *
  * Created:
  *   April 2009 (D.C. van Moolenbroek)
@@ -10,6 +11,7 @@
 #include "inc.h"
 
 #include <sys/statfs.h>
+#include <sys/statvfs.h>
 
 /*===========================================================================*
  *				do_fstatfs				     *
@@ -25,3 +27,53 @@ PUBLIC int do_fstatfs()
   return sys_safecopyto(m_in.m_source, m_in.REQ_GRANT, 0,
 	(vir_bytes) &statfs, sizeof(statfs), D);
 }
+
+/*===========================================================================*
+ *				do_statvfs				     *
+ *===========================================================================*/
+PUBLIC int do_statvfs()
+{
+/* Retrieve file system statistics.
+ */
+  struct statvfs statvfs;
+  struct inode *ino;
+  char path[PATH_MAX];
+  u64_t free, total;
+  int r;
+
+  /* Unfortunately, we cannot be any more specific than this, because we are
+   * not given an inode number. Statistics of individual shared folders can
+   * only be obtained by using the "prefix=" option when mounting.
+   */
+  if ((ino = find_inode(ROOT_INODE_NR)) == NULL)
+	return EINVAL;
+
+  if ((r = verify_inode(ino, path, NULL)) != OK)
+	return r;
+
+  /* It appears that this call always fails with EACCES ("permission denied")
+   * on read-only folders. As far as I can tell, this is a VMware bug.
+   */
+  if ((r = hgfs_queryvol(path, &free, &total)) != OK)
+	return r;
+
+  memset(&statvfs, 0, sizeof(statvfs));
+
+  /* Returning zero for unknown values seems to be the convention. However, we
+   * do have to use a nonzero block size, even though it is entirely arbitrary.
+   */
+  statvfs.f_bsize = BLOCK_SIZE;
+  statvfs.f_frsize = BLOCK_SIZE;
+  statvfs.f_blocks = div64u(total, BLOCK_SIZE);
+  statvfs.f_bfree = div64u(free, BLOCK_SIZE);
+  statvfs.f_bavail = statvfs.f_bfree;
+  statvfs.f_files = 0;
+  statvfs.f_ffree = 0;
+  statvfs.f_favail = 0;
+  statvfs.f_fsid = state.dev;
+  statvfs.f_flag = state.read_only ? ST_RDONLY : 0;
+  statvfs.f_namemax = NAME_MAX;
+
+  return sys_safecopyto(m_in.m_source, m_in.REQ_GRANT, 0,
+	(vir_bytes) &statvfs, sizeof(statvfs), D);
+}

servers/hgfs/proto.h

@@ -38,6 +38,7 @@ _PROTOTYPE( int main, (int argc, char *argv[])				);
 
 /* misc.c */
 _PROTOTYPE( int do_fstatfs, (void)					);
+_PROTOTYPE( int do_statvfs, (void)					);
 
 /* mount.c */
 _PROTOTYPE( int do_readsuper, (void)					);

servers/hgfs/table.c

@@ -40,7 +40,7 @@ PUBLIC _PROTOTYPE( int (*call_vec[]), (void) ) = {
 	no_sys,		/* 29 newnode		*/
 	no_sys,		/* 30 rdlink		*/
 	do_getdents,	/* 31 getdents		*/
-	no_sys,   /* 32 statvfs */
+	do_statvfs,	/* 32 statvfs		*/
 };
 
 /* This should not fail with "array size is negative": */