minix/lib/libsffs/misc.c
David van Moolenbroek ef7b484e5c Create SFFS library out of HGFS
This Shared Folders File System library (libsffs) now contains all the
file system logic originally in HGFS. The actual HGFS server code is
now a stub that passes on all the work to libsffs. The libhgfs library
is changed accordingly.
2012-04-09 18:08:26 +02:00

78 lines
2.3 KiB
C

/* 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)
*/
#include "inc.h"
#include <sys/statfs.h>
#include <sys/statvfs.h>
/*===========================================================================*
* do_fstatfs *
*===========================================================================*/
int do_fstatfs()
{
/* Retrieve file system statistics.
*/
struct statfs statfs;
statfs.f_bsize = BLOCK_SIZE; /* arbitrary block size constant */
return sys_safecopyto(m_in.m_source, m_in.REQ_GRANT, 0,
(vir_bytes) &statfs, sizeof(statfs), D);
}
/*===========================================================================*
* do_statvfs *
*===========================================================================*/
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 making sure that the root of the file system is an
* actual share, and not a list of available shares.
*/
if ((ino = find_inode(ROOT_INODE_NR)) == NULL)
return EINVAL;
if ((r = verify_inode(ino, path, NULL)) != OK)
return r;
if ((r = sffs_table->t_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.s_dev;
statvfs.f_flag = state.s_read_only ? ST_RDONLY : 0;
statvfs.f_flag |= ST_NOTRUNC;
statvfs.f_namemax = NAME_MAX;
return sys_safecopyto(m_in.m_source, m_in.REQ_GRANT, 0,
(vir_bytes) &statvfs, sizeof(statvfs), D);
}