minix3/fs/pfs/open.c

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2020-02-21 00:59:27 +05:30
#include "fs.h"
#include <sys/stat.h>
#include "buf.h"
#include "inode.h"
#include <minix/vfsif.h>
/*===========================================================================*
* fs_newnode *
*===========================================================================*/
int fs_newnode(message *fs_m_in, message *fs_m_out)
{
register int r = OK;
mode_t bits;
struct inode *rip;
uid_t uid;
gid_t gid;
dev_t dev;
uid = fs_m_in->m_vfs_fs_newnode.uid;
gid = fs_m_in->m_vfs_fs_newnode.gid;
bits = fs_m_in->m_vfs_fs_newnode.mode;
dev = fs_m_in->m_vfs_fs_newnode.device;
/* Try to allocate the inode */
if( (rip = alloc_inode(dev, bits, uid, gid) ) == NULL) return(err_code);
switch (bits & S_IFMT) {
case S_IFBLK:
case S_IFCHR:
rip->i_rdev = dev; /* Major/minor dev numbers */
break;
case S_IFIFO:
if ((get_block(dev, rip->i_num)) == NULL)
r = EIO;
break;
default:
r = EIO; /* Unsupported file type */
}
if (r != OK) {
free_inode(rip);
} else {
/* Fill in the fields of the response message */
fs_m_out->m_fs_vfs_newnode.inode = rip->i_num;
fs_m_out->m_fs_vfs_newnode.mode = rip->i_mode;
fs_m_out->m_fs_vfs_newnode.file_size = rip->i_size;
fs_m_out->m_fs_vfs_newnode.uid = rip->i_uid;
fs_m_out->m_fs_vfs_newnode.gid = rip->i_gid;
fs_m_out->m_fs_vfs_newnode.device = dev;
}
return(r);
}