minix/lib/libsffs/misc.c

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/* This file contains miscellaneous file system call handlers.
*
* The entry points into this file are:
* do_fstatfs perform the FSTATFS file system call
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* do_statvfs perform the STATVFS file system call
*
* Created:
* April 2009 (D.C. van Moolenbroek)
*/
#include "inc.h"
#include <sys/statfs.h>
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#include <sys/statvfs.h>
/*===========================================================================*
* do_fstatfs *
*===========================================================================*/
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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));
}
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/*===========================================================================*
* do_statvfs *
*===========================================================================*/
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int do_statvfs()
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{
/* 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.
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*/
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)
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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;
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statvfs.f_namemax = NAME_MAX;
return sys_safecopyto(m_in.m_source, m_in.REQ_GRANT, 0,
(vir_bytes) &statvfs, sizeof(statvfs));
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}