/*
* Called for stat().
* Set the type and the size (block devices only).
* The link count for a device is always 1.
*/
static
int
dev_stat(struct vnode *v, struct stat *statbuf)
{
struct device *d = v->vn_data;
int result;
bzero(statbuf, sizeof(struct stat));
result = VOP_GETTYPE(v, &statbuf->st_mode);
if (result) {
return result;
}
statbuf->st_nlink = 1;
statbuf->st_blocks = d->d_blocks;
if (d->d_blocks > 0) {
statbuf->st_size = d->d_blocks * d->d_blocksize;
}
else {
statbuf->st_size = 0;
}
return 0;
}
/*
* Called for stat().
* Set the type and the size (block devices only).
* The link count for a device is always 1.
*/
static
int
dev_stat(struct vnode *v, struct stat *statbuf)
{
struct device *d = v->vn_data;
int result;
bzero(statbuf, sizeof(struct stat));
if (d->d_blocks > 0) {
statbuf->st_size = d->d_blocks * d->d_blocksize;
statbuf->st_blksize = d->d_blocksize;
}
else {
statbuf->st_size = 0;
}
result = VOP_GETTYPE(v, &statbuf->st_mode);
if (result) {
return result;
}
/* Make up some plausible default permissions. */
statbuf->st_mode |= 0600;
statbuf->st_nlink = 1;
statbuf->st_blocks = d->d_blocks;
/* The device number this device sits on (in OS/161, it doesn't) */
statbuf->st_dev = 0;
/* The device number this device *is* */
statbuf->st_rdev = d->d_devnumber;
return 0;
}
/*
* Called for stat/fstat/lstat.
*/
static
int
sfs_stat(struct vnode *v, struct stat *statbuf)
{
struct sfs_vnode *sv = v->vn_data;
int result;
/* Fill in the stat structure */
bzero(statbuf, sizeof(struct stat));
result = VOP_GETTYPE(v, &statbuf->st_mode);
if (result) {
return result;
}
statbuf->st_size = sv->sv_i.sfi_size;
/* We don't support these yet; you get to implement them */
statbuf->st_nlink = 0;
statbuf->st_blocks = 0;
/* Fill in other field as desired/possible... */
return 0;
}
/*
* Set current directory as a vnode.
* The passed vnode must in fact be a directory.
*/
int
vfs_setcurdir(struct vnode *dir)
{
struct vnode *old;
mode_t vtype;
int result;
result = VOP_GETTYPE(dir, &vtype);
if (result) {
return result;
}
if (vtype != S_IFDIR) {
return ENOTDIR;
}
VOP_INCREF(dir);
spinlock_acquire(&curproc->p_lock);
old = curproc->p_cwd;
curproc->p_cwd = dir;
spinlock_release(&curproc->p_lock);
if (old!=NULL) {
VOP_DECREF(old);
}
return 0;
}
/*
* Called for stat/fstat/lstat.
*
* Locking: gets/releases vnode lock.
*
* Requires 1 buffer.
*/
static
int
sfs_stat(struct vnode *v, struct stat *statbuf)
{
struct sfs_vnode *sv = v->vn_data;
struct sfs_dinode *inodeptr;
int result;
/* Fill in the stat structure */
bzero(statbuf, sizeof(struct stat));
result = VOP_GETTYPE(v, &statbuf->st_mode);
if (result) {
return result;
}
lock_acquire(sv->sv_lock);
reserve_buffers(SFS_BLOCKSIZE);
result = sfs_dinode_load(sv);
if (result) {
unreserve_buffers(SFS_BLOCKSIZE);
lock_release(sv->sv_lock);
return result;
}
inodeptr = sfs_dinode_map(sv);
statbuf->st_size = inodeptr->sfi_size;
statbuf->st_nlink = inodeptr->sfi_linkcount;
/* We don't support this yet */
statbuf->st_blocks = 0;
/* Fill in other fields as desired/possible... */
sfs_dinode_unload(sv);
unreserve_buffers(SFS_BLOCKSIZE);
lock_release(sv->sv_lock);
return 0;
}
/*
* VOP_STAT
*/
static
int
emufs_stat(struct vnode *v, struct stat *statbuf)
{
struct emufs_vnode *ev = v->vn_data;
int result;
bzero(statbuf, sizeof(struct stat));
result = emu_getsize(ev->ev_emu, ev->ev_handle, &statbuf->st_size);
if (result) {
return result;
}
result = VOP_GETTYPE(v, &statbuf->st_mode);
if (result) {
return result;
}
statbuf->st_mode |= 0644; /* possibly a lie */
statbuf->st_nlink = 1; /* might be a lie, but doesn't matter much */
statbuf->st_blocks = 0; /* almost certainly a lie */
return 0;
}