58 lines
1.7 KiB
C
58 lines
1.7 KiB
C
/* This file contains miscellaneous file system call handlers.
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*
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* The entry points into this file are:
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* do_statvfs perform the STATVFS file system call
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*
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* Created:
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* April 2009 (D.C. van Moolenbroek)
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*/
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#include "inc.h"
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#include <sys/statvfs.h>
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/*===========================================================================*
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* do_statvfs *
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*===========================================================================*/
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int do_statvfs(void)
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{
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/* Retrieve file system statistics.
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*/
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struct statvfs statvfs;
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struct inode *ino;
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char path[PATH_MAX];
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u64_t free, total;
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int r;
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/* Unfortunately, we cannot be any more specific than this, because we are
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* not given an inode number. Statistics of individual shared folders can
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* only be obtained by making sure that the root of the file system is an
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* actual share, and not a list of available shares.
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*/
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if ((ino = find_inode(ROOT_INODE_NR)) == NULL)
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return EINVAL;
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if ((r = verify_inode(ino, path, NULL)) != OK)
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return r;
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if ((r = sffs_table->t_queryvol(path, &free, &total)) != OK)
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return r;
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memset(&statvfs, 0, sizeof(statvfs));
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/* Returning zero for unknown values seems to be the convention. However, we
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* do have to use a nonzero block size, even though it is entirely arbitrary.
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*/
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statvfs.f_flag = ST_NOTRUNC;
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statvfs.f_bsize = BLOCK_SIZE;
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statvfs.f_frsize = BLOCK_SIZE;
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statvfs.f_iosize = BLOCK_SIZE;
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statvfs.f_blocks = (unsigned long)(total / BLOCK_SIZE);
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statvfs.f_bfree = (unsigned long)(free / BLOCK_SIZE);
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statvfs.f_bavail = statvfs.f_bfree;
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statvfs.f_namemax = NAME_MAX;
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return sys_safecopyto(m_in.m_source, m_in.m_vfs_fs_statvfs.grant, 0,
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(vir_bytes) &statvfs, sizeof(statvfs));
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}
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