minix/servers/pfs/open.c

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2009-12-20 21:41:50 +01:00
#include "fs.h"
#include <sys/stat.h>
#include <unistd.h>
#include <minix/callnr.h>
#include <minix/com.h>
#include "buf.h"
#include "inode.h"
#include <minix/vfsif.h>
/*===========================================================================*
* fs_newnode *
*===========================================================================*/
PUBLIC int fs_newnode()
{
register int r = OK;
mode_t bits;
struct inode *rip;
dev_t dev;
caller_uid = fs_m_in.REQ_UID;
caller_gid = fs_m_in.REQ_GID;
bits = fs_m_in.REQ_MODE;
dev = fs_m_in.REQ_DEV;
/* Try to allocate the inode */
if( (rip = alloc_inode(dev, bits) ) == NIL_INODE) return(err_code);
if (bits & S_IFMT != S_IFIFO) {
r = EIO; /* We only support pipes */
} else if ((get_block(dev, rip->i_num)) == NIL_BUF)
r = EIO;
if (r != OK) {
free_inode(rip);
} else {
/* Fill in the fields of the response message */
fs_m_out.RES_INODE_NR = rip->i_num;
fs_m_out.RES_MODE = rip->i_mode;
fs_m_out.RES_FILE_SIZE_LO = rip->i_size;
fs_m_out.RES_UID = rip->i_uid;
fs_m_out.RES_GID = rip->i_gid;
fs_m_out.RES_DEV = dev;
}
return(r);
}