编译时的一个警告，INIT_WORK的，在线等

[tananade]

447 INIT_WORK(&stuff->work, sculld_do_deferred_op);

5 main.c|447| warning: assignment from incompatible pointer type

参数的声明和定义如下：

struct async_work {
struct kiocb *iocb;
int result;
struct work_struct work;
};

struct async_work *stuff;

static void sculld_do_deferred_op(void *p)

不知道怎么回事？明明类型都对阿，怎么说指针类型不对呢？
求点拨

[tananade]

居然没有人..........

还一个问题，我的内核源码是2.6.32的
突然发现struct file_operations好像有了改变？本人菜鸟，有很多不理解之处

linux/fs.h

/*
 * NOTE:
 * read, write, poll, fsync, readv, writev, unlocked_ioctl and compat_ioctl
 * can be called without the big kernel lock held in all filesystems.
 */
struct file_operations {
	struct module *owner;
	loff_t (*llseek) (struct file *, loff_t, int);
	ssize_t (*read) (struct file *, char __user *, size_t, loff_t *);
	ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *);
	ssize_t (*aio_read) (struct kiocb *, const struct iovec *, unsigned long, loff_t);
	ssize_t (*aio_write) (struct kiocb *, const struct iovec *, unsigned long, loff_t);
	int (*readdir) (struct file *, void *, filldir_t);
	unsigned int (*poll) (struct file *, struct poll_table_struct *);
	int (*ioctl) (struct inode *, struct file *, unsigned int, unsigned long);
	long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long);
	long (*compat_ioctl) (struct file *, unsigned int, unsigned long);
	int (*mmap) (struct file *, struct vm_area_struct *);
	int (*open) (struct inode *, struct file *);
	int (*flush) (struct file *, fl_owner_t id);
	int (*release) (struct inode *, struct file *);
	int (*fsync) (struct file *, struct dentry *, int datasync);
	int (*aio_fsync) (struct kiocb *, int datasync);
	int (*fasync) (int, struct file *, int);
	int (*lock) (struct file *, int, struct file_lock *);
	ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int);
	unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
	int (*check_flags)(int);
	int (*flock) (struct file *, int, struct file_lock *);
	ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int);
	ssize_t (*splice_read)(struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned int);
	int (*setlease)(struct file *, long, struct file_lock **);
};

这file_operation结构里面都没有了readv,writev，为什么上面NOTE里面写readv,writev可以在没有大内核锁的情况下在任何文件系统中使用？

还有
ssize_t (*aio_read) (struct kiocb *, const struct iovec *, unsigned long, loff_t);
ssize_t (*aio_write) (struct kiocb *, const struct iovec *, unsigned long, loff_t);
里面的参数是不是发生了变化阿，ldd3里面写的是
ssize_t (*aio_read) (struct kiocb *, char __user *, size_t, loff_t);
ssize_t (*aio_write) (struct kiocb *, const char __user *, size_t, loff_t*);

而现在的aio_read和aio_write的参数和以前的readv,writev一样

求解啊？

实在是困惑了，以前的代码都不知道怎么改了

[tananade]

唉，居然还是没有人.....
第一个问题我已经找到了
static void sculld_do_deferred_op(void *p)
参数要为
static void sculld_do_deferred_op(struct work_struct *p)
主要是INIT_WORK由3个参数变为了2个参数，void *data参数没有了，合并到work_struct里面了
所以只能通过这种方法传递给处理函数
具体大家看看这个网站吧
http://ubuntuforums.org/showthread.php?t=441180

[windman521]

[Quote=引用 2 楼 tananade 的回复:]

唉，居然还是没有人.....
第一个问题我已经找到了
static void sculld_do_deferred_op(void *p)
参数要为
static void sculld_do_deferred_op(struct work_struct *p)
主要是INIT_WORK由3个参数变为了2个参数，void *data参数没有了，合并到work_struct里面了
所以……
[/Quote]

我帮你顶

[hero1985]

static void sculld_do_deferred_op(void *p)
====>>
static void sculld_do_deferred_op((struct work_struct *)p)

[hero1985]

readv() 和 writev() 方法，在file_operations 结构中，已经被移除，以有利于aio_readv() 和 aio_writev() （原型被改变了）。请看这篇文章：http://lwn.net/Articles/202449/。


google from:
http://www.chinaunix.net/jh/4/1040681.html

[念茜]

work_struct里的那个data已经不是参数了，如果需要传参数，在你自己的结构体里加上个param，然后container_of过去最好。