/*===========================================================================*
* verify_path *
*===========================================================================*/
int verify_path(char path[PATH_MAX], struct inode *ino,
struct sffs_attr *attr, int *stale)
{
/* Given a path, and the inode associated with that path, verify if the inode
* still matches the real world. Obtain the attributes of the file identified
* by the given path, and see if they match. If not, possibly mark the inode
* as deleted and return an error. Only upon success is the inode guaranteed
* to be usable.
*
* The caller must set the a_mask field of the passed attr struct.
* If 'stale' is not NULL, the value it points to must be initialized to 0,
* and will be set to 1 if the path was valid but the inode wasn't.
*/
int r;
attr->a_mask |= SFFS_ATTR_MODE;
r = sffs_table->t_getattr(path, attr);
dprintf(("%s: verify_path: getattr('%s') returned %d\n",
sffs_name, path, r));
if (r != OK) {
/* If we are told that the path does not exist, delete the inode */
if (r == ENOENT || r == ENOTDIR)
del_dentry(ino);
return r; /* path isn't valid */
}
/* If the file type (reg, dir) isn't what we thought, delete the inode */
if ((ino->i_flags & I_DIR) != MODE_TO_DIRFLAG(attr->a_mode)) {
del_dentry(ino);
if (stale != NULL) *stale = 1;
return ENOENT; /* path is valid, inode wasn't */
}
return OK; /* path and inode are valid */
}
/*===========================================================================*
* do_mkdir *
*===========================================================================*/
PUBLIC int do_mkdir()
{
/* Make a new directory.
*/
char path[PATH_MAX], name[NAME_MAX+1];
struct inode *parent, *ino;
int r;
/* We cannot create directories on a read-only file system. */
if (state.read_only)
return EROFS;
/* Get the path string and possibly an inode for the given path. */
if ((r = get_name(m_in.REQ_GRANT, m_in.REQ_PATH_LEN, name)) != OK)
return r;
if (!strcmp(name, ".") || !strcmp(name, "..")) return EEXIST;
if ((parent = find_inode(m_in.REQ_INODE_NR)) == NULL)
return EINVAL;
if ((r = verify_dentry(parent, name, path, &ino)) != OK)
return r;
/* Perform the actual mkdir call. */
r = hgfs_mkdir(path, m_in.REQ_MODE);
if (r != OK) {
if (ino != NULL)
put_inode(ino);
return r;
}
/* If we thought the new dentry already existed, it was apparently gone
* already. Delete it.
*/
if (ino != NULL) {
del_dentry(ino);
put_inode(ino);
}
return OK;
}
/*===========================================================================*
* do_create *
*===========================================================================*/
PUBLIC int do_create()
{
/* Create a new file.
*/
char path[PATH_MAX], name[NAME_MAX+1];
struct inode *parent, *ino;
struct hgfs_attr attr;
hgfs_file_t handle;
int r;
/* We cannot create files on a read-only file system. */
if (state.read_only)
return EROFS;
/* Get path, name, parent inode and possibly inode for the given path. */
if ((r = get_name(m_in.REQ_GRANT, m_in.REQ_PATH_LEN, name)) != OK)
return r;
if (!strcmp(name, ".") || !strcmp(name, "..")) return EEXIST;
if ((parent = find_inode(m_in.REQ_INODE_NR)) == NULL)
return EINVAL;
if ((r = verify_dentry(parent, name, path, &ino)) != OK)
return r;
/* Are we going to need a new inode upon success?
* Then make sure there is one available before trying anything.
*/
if (ino == NULL || ino->i_ref > 1 || HAS_CHILDREN(ino)) {
if (!have_free_inode()) {
if (ino != NULL)
put_inode(ino);
return ENFILE;
}
}
/* Perform the actual create call. */
r = hgfs_open(path, O_CREAT | O_EXCL | O_RDWR, m_in.REQ_MODE, &handle);
if (r != OK) {
/* Let's not try to be too clever with error codes here. If something
* is wrong with the directory, we'll find out later anyway.
*/
if (ino != NULL)
put_inode(ino);
return r;
}
/* Get the created file's attributes. */
attr.a_mask = HGFS_ATTR_MODE | HGFS_ATTR_SIZE;
r = hgfs_getattr(path, &attr);
/* If this fails, or returns a directory, we have a problem. This
* scenario is in fact possible with race conditions.
* Simulate a close and return a somewhat appropriate error.
*/
if (r != OK || S_ISDIR(attr.a_mode)) {
printf("HGFS: lost file after creation!\n");
hgfs_close(handle);
if (ino != NULL) {
del_dentry(ino);
put_inode(ino);
}
return (r == OK) ? EEXIST : r;
}
/* We do assume that the HGFS open(O_CREAT|O_EXCL) did its job.
* If we previousy found an inode, get rid of it now. It's old.
*/
if (ino != NULL) {
del_dentry(ino);
put_inode(ino);
}
/* Associate the open file handle with an inode, and reply with its details.
*/
ino = get_free_inode();
assert(ino != NULL); /* we checked before whether we had a free one */
ino->i_file = handle;
ino->i_flags = I_HANDLE;
add_dentry(parent, name, ino);
m_out.RES_INODE_NR = INODE_NR(ino);
m_out.RES_MODE = get_mode(ino, attr.a_mode);
m_out.RES_FILE_SIZE_HI = ex64hi(attr.a_size);
m_out.RES_FILE_SIZE_LO = ex64lo(attr.a_size);
m_out.RES_UID = opt.uid;
m_out.RES_GID = opt.gid;
m_out.RES_DEV = NO_DEV;
return OK;
}
