syscalls.c

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#include <linux/file.h>
#include <linux/fs.h>
#include <linux/export.h>
#include <linux/mount.h>
#include <linux/namei.h>
#include <linux/slab.h>

#include <asm/uaccess.h>

#include "spufs.h"

static long do_spu_run(struct file *filp,
            __u32 __user *unpc,
            __u32 __user *ustatus)
{
    long ret;
    struct spufs_inode_info *i;
    u32 npc, status;

    ret = -EFAULT;
    if (get_user(npc, unpc))
        goto out;

    /* check if this file was created by spu_create */
    ret = -EINVAL;
    if (filp->f_op != &spufs_context_fops)
        goto out;

    i = SPUFS_I(filp->f_path.dentry->d_inode);
    ret = spufs_run_spu(i->i_ctx, &npc, &status);

    if (put_user(npc, unpc))
        ret = -EFAULT;

    if (ustatus && put_user(status, ustatus))
        ret = -EFAULT;
out:
    return ret;
}

static long do_spu_create(const char __user *pathname, unsigned int flags,
        umode_t mode, struct file *neighbor)
{
    struct path path;
    struct dentry *dentry;
    int ret;

    dentry = user_path_create(AT_FDCWD, pathname, &path, 1);
    ret = PTR_ERR(dentry);
    if (!IS_ERR(dentry)) {
        ret = spufs_create(&path, dentry, flags, mode, neighbor);
        done_path_create(&path, dentry);
    }

    return ret;
}

struct spufs_calls spufs_calls = {
    .create_thread = do_spu_create,
    .spu_run = do_spu_run,
    .coredump_extra_notes_size = spufs_coredump_extra_notes_size,
    .coredump_extra_notes_write = spufs_coredump_extra_notes_write,
    .notify_spus_active = do_notify_spus_active,
    .owner = THIS_MODULE,
};