[BUG] Using inotify on /proc/partitoins

[majianpeng]

Hi all,
     I wanted to monitor /proc/partitions using inotify.Although now i know it 
can't catch the event of write.
But for read,it can't catch. The code is:
int main()
{
        int fd = inotify_init();
        int wd;
        char buff[4096];
        int ret;
        if (fd < 0)
                perror("inotify_init error\n");

        wd = inotify_add_watch(fd, "/proc/partitions", IN_ACCESS);
        if (wd < 0)
                perror("inotify_add_watch error\n");

        
        ret = read(fd, buff, 4096);
        if (ret < 0)
                perror("read error\n");
        else
                printf("buff %s\n", buff);
        return 0;
}

But when i call 'cat /proc/partitions',the program can't return.
So i added some message in kernel in order to find the reason.
In procfs for some files, the inode used this method to alloc.
proc_lookup-->proc_lookup_de--->proc_get_inode-->new_inode_pseudo
In new_inode_pseudo, it will alloc new inode so every open-operation procfs 
will alloc new inode.
So inotify can't work.

I think it should add a flag which indicate file can't support inotify.Although 
 there are a few files in procfs.


Thanks!
Jianpeng