函数源码

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source File:fs\read_write.c Create Date:2022-07-29 10:31:22
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ssize_t __kernel_write(struct file *file, const void *buf, size_t count, loff_t *pos)
{
    mm_segment_t old_fs;
    const char __user *p;
    ssize_t ret;
 
    if (!(file->f_mode & FMODE_CAN_WRITE))
        return -EINVAL;
 
    old_fs = get_fs();
    set_fs(KERNEL_DS);
    p = (__force const char __user *)buf;
    if (count > MAX_RW_COUNT)
        count =  MAX_RW_COUNT;
    ret = __vfs_write(file, p, count, pos);
    set_fs(old_fs);
    if (ret > 0) {
        fsnotify_modify(file);
        add_wchar(current, ret);
    }
    inc_syscw(current);
    return ret;
}