ef7b484e5c
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.
168 lines
4.2 KiB
C
168 lines
4.2 KiB
C
/* 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 *
|
|
*===========================================================================*/
|
|
mode_t get_mode(ino, mode)
|
|
struct inode *ino;
|
|
int mode;
|
|
{
|
|
/* Return the mode for an inode, given the inode and the retrieved mode.
|
|
*/
|
|
|
|
mode &= S_IRWXU;
|
|
mode = mode | (mode >> 3) | (mode >> 6);
|
|
|
|
if (IS_DIR(ino))
|
|
mode = S_IFDIR | (mode & sffs_params->p_dir_mask);
|
|
else
|
|
mode = S_IFREG | (mode & sffs_params->p_file_mask);
|
|
|
|
if (state.s_read_only)
|
|
mode &= ~(S_IWUSR | S_IWGRP | S_IWOTH);
|
|
|
|
return mode;
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* do_stat *
|
|
*===========================================================================*/
|
|
int do_stat()
|
|
{
|
|
/* Retrieve inode status.
|
|
*/
|
|
struct inode *ino;
|
|
struct sffs_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 = SFFS_ATTR_MODE | SFFS_ATTR_SIZE | SFFS_ATTR_CRTIME |
|
|
SFFS_ATTR_ATIME | SFFS_ATTR_MTIME | SFFS_ATTR_CTIME;
|
|
|
|
if ((r = verify_inode(ino, path, &attr)) != OK)
|
|
return r;
|
|
|
|
memset(&stat, 0, sizeof(struct stat));
|
|
|
|
stat.st_dev = state.s_dev;
|
|
stat.st_ino = ino_nr;
|
|
stat.st_mode = get_mode(ino, attr.a_mode);
|
|
stat.st_uid = sffs_params->p_uid;
|
|
stat.st_gid = sffs_params->p_gid;
|
|
stat.st_rdev = NO_DEV;
|
|
if (cmp64u(attr.a_size, LONG_MAX) > 0)
|
|
stat.st_size = LONG_MAX;
|
|
else
|
|
stat.st_size = ex64lo(attr.a_size);
|
|
stat.st_atimespec = attr.a_atime;
|
|
stat.st_mtimespec = attr.a_mtime;
|
|
stat.st_ctimespec = attr.a_ctime;
|
|
stat.st_birthtimespec = attr.a_crtime;
|
|
|
|
stat.st_blocks = stat.st_size / S_BLKSIZE;
|
|
if (stat.st_size % S_BLKSIZE != 0)
|
|
stat.st_blocks += 1;
|
|
|
|
stat.st_blksize = BLOCK_SIZE;
|
|
|
|
/* 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 *
|
|
*===========================================================================*/
|
|
int do_chmod()
|
|
{
|
|
/* Change file mode.
|
|
*/
|
|
struct inode *ino;
|
|
char path[PATH_MAX];
|
|
struct sffs_attr attr;
|
|
int r;
|
|
|
|
if (state.s_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 = SFFS_ATTR_MODE;
|
|
attr.a_mode = m_in.REQ_MODE; /* no need to convert in this direction */
|
|
|
|
if ((r = sffs_table->t_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 *
|
|
*===========================================================================*/
|
|
int do_utime()
|
|
{
|
|
/* Set file times.
|
|
*/
|
|
struct inode *ino;
|
|
char path[PATH_MAX];
|
|
struct sffs_attr attr;
|
|
int r;
|
|
|
|
if (state.s_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 = SFFS_ATTR_ATIME | SFFS_ATTR_MTIME;
|
|
attr.a_atime.tv_sec = m_in.REQ_ACTIME;
|
|
attr.a_atime.tv_nsec = 0;
|
|
attr.a_mtime.tv_sec = m_in.REQ_MODTIME;
|
|
attr.a_mtime.tv_nsec = 0;
|
|
|
|
return sffs_table->t_setattr(path, &attr);
|
|
}
|