minix/lib/libsffs/misc.c

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/* This file contains miscellaneous file system call handlers.
*
* The entry points into this file are:
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* do_statvfs perform the STATVFS file system call
*
* Created:
* April 2009 (D.C. van Moolenbroek)
*/
#include "inc.h"
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#include <sys/statvfs.h>
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/*===========================================================================*
* do_statvfs *
*===========================================================================*/
int do_statvfs(void)
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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_flag = ST_NOTRUNC;
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statvfs.f_bsize = BLOCK_SIZE;
statvfs.f_frsize = BLOCK_SIZE;
statvfs.f_iosize = BLOCK_SIZE;
statvfs.f_blocks = (unsigned long)(total / BLOCK_SIZE);
statvfs.f_bfree = (unsigned long)(free / BLOCK_SIZE);
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statvfs.f_bavail = statvfs.f_bfree;
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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}