minix/servers/hgfs/stat.c

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/* This file contains file metadata retrieval and manipulation routines.
*
* The entry points into this file are:
* get_mode return a file's mode
* do_stat perform the STAT file system call
* do_chmod perform the CHMOD file system call
* do_utime perform the UTIME file system call
*
* Created:
* April 2009 (D.C. van Moolenbroek)
*/
#include "inc.h"
/*===========================================================================*
* get_mode *
*===========================================================================*/
PUBLIC mode_t get_mode(ino, mode)
struct inode *ino;
int mode;
{
/* Return the mode for an inode, given the inode and the HGFS retrieved mode.
*/
mode &= S_IRWXU;
mode = mode | (mode >> 3) | (mode >> 6);
if (IS_DIR(ino))
mode = S_IFDIR | (mode & opt.dir_mask);
else
mode = S_IFREG | (mode & opt.file_mask);
if (state.read_only)
mode &= ~0222;
return mode;
}
/*===========================================================================*
* do_stat *
*===========================================================================*/
PUBLIC int do_stat()
{
/* Retrieve inode status.
*/
struct inode *ino;
struct hgfs_attr attr;
struct stat stat;
char path[PATH_MAX];
ino_t ino_nr;
int r;
ino_nr = m_in.REQ_INODE_NR;
/* Don't increase the inode refcount: it's already open anyway */
if ((ino = find_inode(ino_nr)) == NULL)
return EINVAL;
attr.a_mask = HGFS_ATTR_MODE | HGFS_ATTR_SIZE | HGFS_ATTR_ATIME |
HGFS_ATTR_MTIME | HGFS_ATTR_CTIME;
if ((r = verify_inode(ino, path, &attr)) != OK)
return r;
stat.st_dev = state.dev;
stat.st_ino = ino_nr;
stat.st_mode = get_mode(ino, attr.a_mode);
stat.st_uid = opt.uid;
stat.st_gid = opt.gid;
stat.st_rdev = NO_DEV;
stat.st_size = ex64hi(attr.a_size) ? ULONG_MAX : ex64lo(attr.a_size);
stat.st_atime = attr.a_atime;
stat.st_mtime = attr.a_mtime;
stat.st_ctime = attr.a_ctime;
/* We could make this more accurate by iterating over directory inodes'
* children, counting how many of those are directories as well.
* It's just not worth it.
*/
stat.st_nlink = 0;
if (ino->i_parent != NULL) stat.st_nlink++;
if (IS_DIR(ino)) {
stat.st_nlink++;
if (HAS_CHILDREN(ino)) stat.st_nlink++;
}
return sys_safecopyto(m_in.m_source, m_in.REQ_GRANT, 0,
(vir_bytes) &stat, sizeof(stat), D);
}
/*===========================================================================*
* do_chmod *
*===========================================================================*/
PUBLIC int do_chmod()
{
/* Change file mode.
*/
struct inode *ino;
char path[PATH_MAX];
struct hgfs_attr attr;
int r;
if (state.read_only)
return EROFS;
if ((ino = find_inode(m_in.REQ_INODE_NR)) == NULL)
return EINVAL;
if ((r = verify_inode(ino, path, NULL)) != OK)
return r;
/* Set the new file mode. */
attr.a_mask = HGFS_ATTR_MODE;
attr.a_mode = m_in.REQ_MODE; /* no need to convert in this direction */
if ((r = hgfs_setattr(path, &attr)) != OK)
return r;
/* We have no idea what really happened. Query for the mode again. */
if ((r = verify_path(path, ino, &attr, NULL)) != OK)
return r;
m_out.RES_MODE = get_mode(ino, attr.a_mode);
return OK;
}
/*===========================================================================*
* do_utime *
*===========================================================================*/
PUBLIC int do_utime()
{
/* Set file times.
*/
struct inode *ino;
char path[PATH_MAX];
struct hgfs_attr attr;
int r;
if (state.read_only)
return EROFS;
if ((ino = find_inode(m_in.REQ_INODE_NR)) == NULL)
return EINVAL;
if ((r = verify_inode(ino, path, NULL)) != OK)
return r;
attr.a_mask = HGFS_ATTR_ATIME | HGFS_ATTR_MTIME;
attr.a_atime = m_in.REQ_ACTIME;
attr.a_mtime = m_in.REQ_MODTIME;
return hgfs_setattr(path, &attr);
}