minix/lib/libsffs/handle.c
David van Moolenbroek ef7b484e5c Create SFFS library out of HGFS
This Shared Folders File System library (libsffs) now contains all the
file system logic originally in HGFS. The actual HGFS server code is
now a stub that passes on all the work to libsffs. The libhgfs library
is changed accordingly.
2012-04-09 18:08:26 +02:00

79 lines
1.9 KiB
C

/* This file contains open file and directory handle management functions.
*
* The entry points into this file are:
* get_handle open a handle for an inode and store the handle
* put_handle close any handles associated with an inode
*
* Created:
* April 2009 (D.C. van Moolenbroek)
*/
#include "inc.h"
#include <fcntl.h>
/*===========================================================================*
* get_handle *
*===========================================================================*/
int get_handle(ino)
struct inode *ino;
{
/* Get an open file or directory handle for an inode.
*/
char path[PATH_MAX];
int r;
/* If we don't have a file handle yet, try to open the file now. */
if (ino->i_flags & I_HANDLE)
return OK;
if ((r = verify_inode(ino, path, NULL)) != OK)
return r;
if (IS_DIR(ino)) {
r = sffs_table->t_opendir(path, &ino->i_dir);
}
else {
if (!state.s_read_only)
r = sffs_table->t_open(path, O_RDWR, 0, &ino->i_file);
/* Protection or mount status might prevent us from writing. With the
* information that we have available, this is the best we can do..
*/
if (state.s_read_only || r != OK)
r = sffs_table->t_open(path, O_RDONLY, 0, &ino->i_file);
}
if (r != OK)
return r;
ino->i_flags |= I_HANDLE;
return OK;
}
/*===========================================================================*
* put_handle *
*===========================================================================*/
void put_handle(ino)
struct inode *ino;
{
/* Close an open file or directory handle associated with an inode.
*/
int r;
if (!(ino->i_flags & I_HANDLE))
return;
/* We ignore any errors here, because we can't deal with them anyway. */
if (IS_DIR(ino))
r = sffs_table->t_closedir(ino->i_dir);
else
r = sffs_table->t_close(ino->i_file);
if (r != OK)
printf("%s: put_handle: handle close operation returned %d\n",
sffs_name, r);
ino->i_flags &= ~I_HANDLE;
}