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_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_read(vnode_t *file, off_t offset, void *buf, size_t count)
{
int ret;
ramfs_inode_t *inode = VNODE_TO_RAMFSINODE(file);
KASSERT(!S_ISDIR(file->vn_mode));
ret = MAX(0, MIN((off_t)count, inode->rf_size - offset));
memcpy(buf, inode->rf_mem + offset, ret);
return ret;
}
static int
ramfs_lookup(vnode_t *dir, const char *name, size_t namelen, vnode_t **result)
{
off_t i;
ramfs_inode_t *inode = VNODE_TO_RAMFSINODE(dir);
ramfs_dirent_t *entry = (ramfs_dirent_t *)inode->rf_mem;
for (i = 0; i < RAMFS_MAX_DIRENT; i++, entry++) {
if (name_match(entry->rd_name, name, namelen)) {
*result = vget(dir->vn_fs, entry->rd_ino);
return 0;
}
}
return -ENOENT;
}
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_write(vnode_t *file, off_t offset, const void *buf, size_t count)
{
int ret;
ramfs_inode_t *inode = VNODE_TO_RAMFSINODE(file);
KASSERT(!S_ISDIR(file->vn_mode));
ret = MIN((off_t)count, (off_t)PAGE_SIZE - offset);
memcpy(inode->rf_mem + offset, buf, ret);
KASSERT(file->vn_len == inode->rf_size);
file->vn_len = MAX(file->vn_len, offset + ret);
inode->rf_size = file->vn_len;
return ret;
}
static int
ramfs_stat(vnode_t *file, struct stat *buf)
{
ramfs_inode_t *i = VNODE_TO_RAMFSINODE(file);
memset(buf, 0, sizeof(struct stat));
buf->st_mode = file->vn_mode;
buf->st_ino = (int) file->vn_vno;
buf->st_dev = 0;
if (file->vn_mode == S_IFCHR || file->vn_mode == S_IFBLK) {
buf->st_rdev = (int) i->rf_mem;
}
buf->st_nlink = i->rf_linkcount - 1;
buf->st_size = (int) i->rf_size;
buf->st_blksize = (int) PAGE_SIZE;
buf->st_blocks = 1;
return 0;
}
static void
ramfs_delete_vnode(vnode_t *vn)
{
ramfs_inode_t *inode = VNODE_TO_RAMFSINODE(vn);
ramfs_t *rfs = VNODE_TO_RAMFS(vn);
if (0 == --inode->rf_linkcount) {
KASSERT(rfs->rfs_inodes[vn->vn_vno] == inode);
rfs->rfs_inodes[vn->vn_vno] = NULL;
if (inode->rf_mode == RAMFS_TYPE_DATA
|| inode->rf_mode == RAMFS_TYPE_DIR) {
page_free(inode->rf_mem);
}
/* otherwise, inode->rf_mem is a devid */
kfree(inode);
}
}
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;
}
static int
ramfs_query_vnode(vnode_t *vn)
{
return VNODE_TO_RAMFSINODE(vn)->rf_linkcount > 1;
}