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#include <fcntl.h>
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#include <fcntl.h>
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#include <assert.h>
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#include <assert.h>
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#include <vfs/canonify.h>
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#include <vfs/canonify.h>
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/* Forward declarations of static functions. */
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/* Forward declarations of static functions. */
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static int vfs_truncate_internal(int, int, unsigned long, size_t);
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static int vfs_truncate_internal(fs_handle_t, dev_handle_t, fs_index_t, size_t);
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/**
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/**
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 * This rwlock prevents the race between a triplet-to-VFS-node resolution and a
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 * This rwlock prevents the race between a triplet-to-VFS-node resolution and a
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 * concurrent VFS operation which modifies the file system namespace.
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 * concurrent VFS operation which modifies the file system namespace.
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 */
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 */
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    .fs_handle = 0,
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    .fs_handle = 0,
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    .dev_handle = 0,
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    .dev_handle = 0,
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    .index = 0,
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    .index = 0,
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};
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};
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- 
 
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static int
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static int lookup_root(int fs_handle, int dev_handle, vfs_lookup_res_t *result)
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lookup_root(fs_handle_t fs_handle, dev_handle_t dev_handle,
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    vfs_lookup_res_t *result)
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{
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{
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    vfs_pair_t altroot = {
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    vfs_pair_t altroot = {
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        .fs_handle = fs_handle,
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        .fs_handle = fs_handle,
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        .dev_handle = dev_handle,
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        .dev_handle = dev_handle,
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    };
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    };
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    return vfs_lookup_internal("/", L_DIRECTORY, result, &altroot);
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    return vfs_lookup_internal("/", L_DIRECTORY, result, &altroot);
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}
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}
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void vfs_mount(ipc_callid_t rid, ipc_call_t *request)
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void vfs_mount(ipc_callid_t rid, ipc_call_t *request)
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{
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{
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    int dev_handle;
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    dev_handle_t dev_handle;
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    vfs_node_t *mp_node = NULL;
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    vfs_node_t *mp_node = NULL;
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    /*
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    /*
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     * We expect the library to do the device-name to device-handle
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     * We expect the library to do the device-name to device-handle
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     * translation for us, thus the device handle will arrive as ARG1
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     * translation for us, thus the device handle will arrive as ARG1
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     * in the request.
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     * in the request.
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     */
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     */
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    dev_handle = IPC_GET_ARG1(*request);
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    dev_handle = (dev_handle_t)IPC_GET_ARG1(*request);
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    /*
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    /*
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     * For now, don't make use of ARG2 and ARG3, but they can be used to
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     * For now, don't make use of ARG2 and ARG3, but they can be used to
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     * carry mount options in the future.
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     * carry mount options in the future.
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     */
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     */
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    /*
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    /*
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     * Check if we know a file system with the same name as is in fs_name.
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     * Check if we know a file system with the same name as is in fs_name.
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     * This will also give us its file system handle.
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     * This will also give us its file system handle.
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     */
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     */
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    int fs_handle = fs_name_to_handle(fs_name, true);
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    fs_handle_t fs_handle = fs_name_to_handle(fs_name, true);
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    if (!fs_handle) {
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    if (!fs_handle) {
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        ipc_answer_0(rid, ENOENT);
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        ipc_answer_0(rid, ENOENT);
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        return;
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        return;
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    }
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    }
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    }
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    }
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    futex_up(&file->lock);
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    futex_up(&file->lock);
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    ipc_answer_0(rid, EINVAL);
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    ipc_answer_0(rid, EINVAL);
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}
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}
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- 
 
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int
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int vfs_truncate_internal(int fs_handle, int dev_handle, unsigned long index,
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vfs_truncate_internal(fs_handle_t fs_handle, dev_handle_t dev_handle,
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    size_t size)
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    fs_index_t index, size_t size)
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{
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{
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    ipcarg_t rc;
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    ipcarg_t rc;
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    int fs_phone;
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    int fs_phone;
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    fs_phone = vfs_grab_phone(fs_handle);
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    fs_phone = vfs_grab_phone(fs_handle);