vnode_t * fs_create_pseudofs_root(fs_t * newfs, int majornum)
{
int err;
vnode_t * rootnode;
/*
* We use a little trick here and create a temporary vnode that will be
* destroyed after succesful mount.
*/
rootnode = kzalloc(sizeof(vnode_t));
if (!rootnode)
return NULL;
/* Temp root dir */
rootnode->vn_next_mountpoint = rootnode;
vrefset(rootnode, 1);
mtx_init(&rootnode->vn_lock, VN_LOCK_TYPE, VN_LOCK_OPT);
err = fs_mount(rootnode, "", "ramfs", 0, "", 1);
if (err) {
KERROR(KERROR_ERR,
"Unable to create a pseudo fs root vnode for %s (%i)\n",
newfs->fsname, err);
return NULL;
}
rootnode = rootnode->vn_next_mountpoint;
kfree(rootnode->vn_prev_mountpoint);
rootnode->vn_prev_mountpoint = rootnode;
rootnode->vn_next_mountpoint = rootnode;
newfs->fs_majornum = majornum;
newfs->sblist_head = rootnode->sb->fs->sblist_head;
rootnode->sb->fs = newfs;
rootnode->sb->vdev_id = DEV_MMTODEV(majornum, 0);
return rootnode;
}
static void mount_tmp_rootfs(void)
{
const char failed[] = "Failed to mount rootfs";
vnode_t * tmp = NULL;
struct proc_info * kernel_proc;
int ret;
kernel_proc = proc_ref(0);
if (!kernel_proc) {
panic(failed);
}
/* No need to keep the ref because it won't go away. */
proc_unref(kernel_proc);
/* Root dir */
tmp = kzalloc_crit(sizeof(vnode_t));
kernel_proc->croot = tmp;
kernel_proc->croot->vn_next_mountpoint = kernel_proc->croot;
kernel_proc->croot->vn_prev_mountpoint = kernel_proc->croot;
mtx_init(&tmp->vn_lock, MTX_TYPE_SPIN, 0);
vrefset(kernel_proc->croot, 2);
ret = fs_mount(kernel_proc->croot, "", "ramfs", 0, "", 1);
if (ret) {
KERROR(KERROR_ERR, "%s : %i\n", failed, ret);
goto out;
}
kernel_proc->croot->vn_next_mountpoint->vn_prev_mountpoint =
kernel_proc->croot->vn_next_mountpoint;
kernel_proc->croot = kernel_proc->croot->vn_next_mountpoint;
kernel_proc->cwd = kernel_proc->croot;
out:
kfree(tmp);
}
static vnode_t * create_root(struct fatfs_sb * fatfs_sb)
{
char * rootpath;
long vn_hash;
struct fatfs_inode * in;
int err;
rootpath = kzalloc(2);
if (!rootpath)
return NULL;
vn_hash = hash32_str(rootpath, 0);
err = create_inode(&in, fatfs_sb, rootpath, vn_hash,
O_DIRECTORY | O_RDWR);
if (err) {
KERROR(KERROR_ERR, "Failed to init a root vnode for fatfs (%d)\n", err);
return NULL;
}
in->in_fpath = rootpath;
vrefset(&in->in_vnode, 1);
return &in->in_vnode;
}
/**
* Create a inode.
* @param fpath won't be duplicated.
* @param oflags O_CREAT, O_DIRECTORY, O_RDONLY, O_WRONLY and O_RDWR
* currently supported.
* O_WRONLY/O_RDWR creates in write mode if possible, so this
* should be always verified with stat.
*/
static int create_inode(struct fatfs_inode ** result, struct fatfs_sb * sb,
char * fpath, long vn_hash, int oflags)
{
struct fatfs_inode * in = NULL;
FILINFO fno;
vnode_t * vn;
vnode_t * xvp;
mode_t vn_mode;
ino_t inum;
int err = 0, retval = 0;
#ifdef configFATFS_DEBUG
KERROR(KERROR_DEBUG, "create_inode(fpath \"%s\", vn_hash %u)\n",
fpath, (uint32_t)vn_hash);
#endif
in = kzalloc(sizeof(struct fatfs_inode));
if (!in) {
retval = -ENOMEM;
goto fail;
}
in->in_fpath = fpath;
vn = &in->in_vnode;
in->open_count = ATOMIC_INIT(0);
memset(&fno, 0, sizeof(fno));
if (oflags & O_DIRECTORY) {
/* O_DIRECTORY was specified. */
/* TODO Maybe get mp stat? */
fno.fattrib = AM_DIR;
} else if (oflags & O_CREAT) {
if (sb->sb.mode_flags & MNT_RDONLY)
return -EROFS;
} else {
err = f_stat(&sb->ff_fs, fpath, &fno);
if (err) {
retval = fresult2errno(err);
goto fail;
}
}
/* Try open */
if (fno.fattrib & AM_DIR) {
/* it's a directory */
vn_mode = S_IFDIR;
err = f_opendir(&in->dp, &sb->ff_fs, in->in_fpath);
if (err) {
#ifdef configFATFS_DEBUG
KERROR(KERROR_DEBUG, "Can't open a dir (err: %d)\n", err);
#endif
retval = fresult2errno(err);
goto fail;
}
inum = in->dp.ino;
} else {
/* it's a file */
unsigned char fomode = 0;
fomode |= (oflags & O_CREAT) ? FA_OPEN_ALWAYS : FA_OPEN_EXISTING;
/* The kernel should always have RW if possible. */
if (sb->sb.mode_flags & MNT_RDONLY) {
fomode |= FA_READ;
} else {
fomode |= FA_READ | FA_WRITE;
}
vn_mode = S_IFREG;
err = f_open(&in->fp, &sb->ff_fs, in->in_fpath, fomode);
if (err) {
#ifdef configFATFS_DEBUG
KERROR(KERROR_DEBUG, "Can't open a file (err: %d)\n", err);
#endif
retval = fresult2errno(err);
goto fail;
}
inum = in->fp.ino;
}
#ifdef configFATFS_DEBUG
if (oflags & O_CREAT)
KERROR(KERROR_DEBUG, "ff: Create & open ok\n");
else
KERROR(KERROR_DEBUG, "ff: Open ok\n");
#endif
init_fatfs_vnode(vn, inum, vn_mode, vn_hash, &(sb->sb));
/* Insert to the cache */
err = vfs_hash_insert(vn, vn_hash, &xvp, fatfs_vncmp, fpath);
if (err) {
retval = -ENOMEM;
goto fail;
}
if (xvp) {
/* TODO No idea what to do now */
KERROR(KERROR_WARN,
"create_inode(): Found it during insert: \"%s\"\n",
fpath);
}
#ifdef configFATFS_DEBUG
KERROR(KERROR_DEBUG, "create_inode(): ok\n");
#endif
*result = in;
vrefset(vn, 1); /* Make ref for the caller. */
return 0;
fail:
#ifdef configFATFS_DEBUG
KERROR(KERROR_DEBUG, "create_inode(): retval %i\n", retval);
#endif
kfree(in);
return retval;
}