static int
ramfs_unlink(vnode_t *dir, const char *name, size_t namelen)
{
vnode_t *vn;
int ret;
off_t i;
ramfs_dirent_t *entry;
ret = ramfs_lookup(dir, name, namelen, &vn);
KASSERT(0 == ret);
KASSERT(!S_ISDIR(vn->vn_mode));
/* And then remove the entry from the directory */
entry = VNODE_TO_DIRENT(dir);
for (i = 0; i < RAMFS_MAX_DIRENT; i++, entry++) {
if (name_match(entry->rd_name, name, namelen)) {
entry->rd_name[0] = '\0';
break;
}
}
VNODE_TO_RAMFSINODE(dir)->rf_size -= sizeof(ramfs_dirent_t);
VNODE_TO_RAMFSINODE(vn)->rf_linkcount--;
vput(vn);
return 0;
}
static int
ramfs_readdir(vnode_t *dir, off_t offset, struct dirent *d)
{
int ret = 0;
ramfs_dirent_t *dir_entry, *targ_entry;
KASSERT(S_ISDIR(dir->vn_mode));
KASSERT(0 == offset % sizeof(ramfs_dirent_t));
dir_entry = VNODE_TO_DIRENT(dir);
dir_entry = (ramfs_dirent_t *)(((char *)dir_entry) + offset);
targ_entry = dir_entry;
while ((offset < (off_t)(RAMFS_MAX_DIRENT * sizeof(ramfs_dirent_t))) && (!targ_entry->rd_name[0])) {
++targ_entry;
offset += sizeof(ramfs_dirent_t);
}
if (offset >= (off_t)(RAMFS_MAX_DIRENT * sizeof(ramfs_dirent_t)))
return 0;
ret = sizeof(ramfs_dirent_t) + (targ_entry - dir_entry) * sizeof(ramfs_dirent_t);
d->d_ino = targ_entry->rd_ino;
d->d_off = 0; /* unused */
strncpy(d->d_name, targ_entry->rd_name, NAME_LEN - 1);
d->d_name[NAME_LEN - 1] = '\0';
return ret;
}
static int
ramfs_link(vnode_t *oldvnode, vnode_t *dir,
const char *name, size_t name_len)
{
vnode_t *vn;
off_t i;
ramfs_dirent_t *entry;
KASSERT(oldvnode->vn_fs == dir->vn_fs);
KASSERT(0 != ramfs_lookup(dir, name, name_len, &vn));
/* Look for space in the directory */
entry = VNODE_TO_DIRENT(dir);
for (i = 0; i < RAMFS_MAX_DIRENT; i++, entry++) {
if (!entry->rd_name[0])
break;
}
if (i == RAMFS_MAX_DIRENT) {
return -ENOSPC;
}
/* Set entry in parent */
entry->rd_ino = oldvnode->vn_vno;
strncpy(entry->rd_name, name, MIN(name_len, NAME_LEN - 1));
entry->rd_name[MIN(name_len, NAME_LEN - 1)] = '\0';
VNODE_TO_RAMFSINODE(dir)->rf_size += sizeof(ramfs_dirent_t);
/* Increase linkcount */
VNODE_TO_RAMFSINODE(oldvnode)->rf_linkcount++;
return 0;
}
static int
ramfs_rmdir(vnode_t *dir, const char *name, size_t name_len)
{
vnode_t *vn;
int ret;
off_t i;
ramfs_dirent_t *entry;
KASSERT(!name_match(".", name, name_len) &&
!name_match("..", name, name_len));
if ((ret = ramfs_lookup(dir, name, name_len, &vn)) != 0)
return ret;
if (!S_ISDIR(vn->vn_mode)) {
vput(vn);
return -ENOTDIR;
}
/* We have to make sure that this directory is empty */
entry = VNODE_TO_DIRENT(vn);
for (i = 0; i < RAMFS_MAX_DIRENT; i++, entry++) {
if (!strcmp(entry->rd_name, ".") ||
!strcmp(entry->rd_name, ".."))
continue;
if (entry->rd_name[0]) {
vput(vn);
return -ENOTEMPTY;
}
}
/* Finally, remove the entry from the parent directory */
entry = VNODE_TO_DIRENT(dir);
for (i = 0; i < RAMFS_MAX_DIRENT; i++, entry++) {
if (name_match(entry->rd_name, name, name_len)) {
entry->rd_name[0] = '\0';
break;
}
}
VNODE_TO_RAMFSINODE(dir)->rf_size -= sizeof(ramfs_dirent_t);
VNODE_TO_RAMFSINODE(vn)->rf_linkcount--;
vput(vn);
return 0;
}
static int
ramfs_mkdir(vnode_t *dir, const char *name, size_t name_len)
{
vnode_t *vn;
off_t i;
ramfs_dirent_t *entry;
dbg(DBG_INIT,"RAMFS_MKDIR before KASSERT %s\n",name);
KASSERT(0 != ramfs_lookup(dir, name, name_len, &vn));
/* Look for space in the directory */
entry = VNODE_TO_DIRENT(dir);
for (i = 0; i < RAMFS_MAX_DIRENT; i++, entry++) {
if (!entry->rd_name[0])
break;
}
if (i == RAMFS_MAX_DIRENT) {
return -ENOSPC;
}
/* Allocate an inode */
int ino;
if (0 > (ino = ramfs_alloc_inode(dir->vn_fs, RAMFS_TYPE_DIR, 0))) {
return ino;
}
/* Set entry in parent */
entry->rd_ino = ino;
strncpy(entry->rd_name, name, MIN(name_len, NAME_LEN - 1));
entry->rd_name[MIN(name_len, NAME_LEN - 1)] = '\0';
VNODE_TO_RAMFSINODE(dir)->rf_size += sizeof(ramfs_dirent_t);
/* Set up '.' and '..' in the directory */
entry = (ramfs_dirent_t *) VNODE_TO_RAMFS(dir)->rfs_inodes[ino]->rf_mem;
entry->rd_ino = ino;
strcpy(entry->rd_name, ".");
entry++;
entry->rd_ino = dir->vn_vno;
strcpy(entry->rd_name, "..");
/* Increase inode size accordingly */
VNODE_TO_RAMFS(dir)->rfs_inodes[ino]->rf_size = 2 * sizeof(ramfs_dirent_t);
return 0;
}
static int
ramfs_mknod(struct vnode *dir, const char *name, size_t name_len, int mode, devid_t devid)
{
vnode_t *vn;
off_t i;
ramfs_dirent_t *entry;
KASSERT(0 != ramfs_lookup(dir, name, name_len, &vn));
/* Look for space in the directory */
entry = VNODE_TO_DIRENT(dir);
for (i = 0; i < RAMFS_MAX_DIRENT; i++, entry++) {
if (!entry->rd_name[0])
break;
}
if (i == RAMFS_MAX_DIRENT) {
return -ENOSPC;
}
int ino;
if (S_ISCHR(mode)) {
if (0 > (ino = ramfs_alloc_inode(dir->vn_fs, RAMFS_TYPE_CHR, devid))) {
return ino;
}
} else if (S_ISBLK(mode)) {
if (0 > (ino = ramfs_alloc_inode(dir->vn_fs, RAMFS_TYPE_BLK, devid))) {
return ino;
}
} else {
panic("Invalid mode!\n");
}
/* Set entry in directory */
entry->rd_ino = ino;
strncpy(entry->rd_name, name, MIN(name_len, NAME_LEN - 1));
entry->rd_name[MIN(name_len, NAME_LEN - 1)] = '\0';
VNODE_TO_RAMFSINODE(dir)->rf_size += sizeof(ramfs_dirent_t);
return 0;
}
static int
ramfs_create(vnode_t *dir, const char *name, size_t name_len, vnode_t **result)
{
vnode_t *vn;
off_t i;
ramfs_dirent_t *entry;
KASSERT(0 != ramfs_lookup(dir, name, name_len, &vn));
/* Look for space in the directory */
entry = VNODE_TO_DIRENT(dir);
for (i = 0; i < RAMFS_MAX_DIRENT; i++, entry++) {
if (!entry->rd_name[0])
break;
}
if (i == RAMFS_MAX_DIRENT) {
return -ENOSPC;
}
/* Allocate an inode */
int ino;
if (0 > (ino = ramfs_alloc_inode(dir->vn_fs, RAMFS_TYPE_DATA, 0))) {
return ino;
}
/* Get a vnode, set entry in directory */
vn = vget(dir->vn_fs, (ino_t) ino);
entry->rd_ino = vn->vn_vno;
strncpy(entry->rd_name, name, MIN(name_len, NAME_LEN - 1));
entry->rd_name[MIN(name_len, NAME_LEN - 1)] = '\0';
VNODE_TO_RAMFSINODE(dir)->rf_size += sizeof(ramfs_dirent_t);
*result = vn;
return 0;
}
