* Procfs open hook bug.
@ 2003-07-01 10:55 Peter Enderborg
2003-07-01 18:33 ` Alan Cox
0 siblings, 1 reply; 2+ messages in thread
From: Peter Enderborg @ 2003-07-01 10:55 UTC (permalink / raw)
To: linux-kernel; +Cc: Theodore Ts'o, Linus Torvalds
I have done this little patch for the procfs_example.c
diff procfs_example.c
kernels/linux-2.4.20/Documentation/DocBook/procfs_example.c
87,91d86
< static int open_qp(struct inode * inode, struct file * file)
< {
< printk("Open my node %p %p \n",inode,file);
< return -EINVAL;
< }
180c175
< foo_file->proc_fops->open=open_qp;
---
>
And when loading this module. The procfs gets broken. I get EINVAL for
open on
/proc/meminfo and all other procfs info. Why? Should procfs inodes don't
have full
filesematics? And it don't help to unload the module.
Strange. And a look in generic.c in fs/proc/
static struct file_operations proc_file_operations = {
llseek: proc_file_lseek,
read: proc_file_read,
write: proc_file_write,
};
Is this saying that we can not have the other fops on procfs inodes? No
ioctl,open ?
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Procfs open hook bug.
2003-07-01 10:55 Procfs open hook bug Peter Enderborg
@ 2003-07-01 18:33 ` Alan Cox
0 siblings, 0 replies; 2+ messages in thread
From: Alan Cox @ 2003-07-01 18:33 UTC (permalink / raw)
To: Peter Enderborg
Cc: Linux Kernel Mailing List, Theodore Ts'o, Linus Torvalds
On Maw, 2003-07-01 at 11:55, Peter Enderborg wrote:
> And when loading this module. The procfs gets broken. I get EINVAL for
> open on
> /proc/meminfo and all other procfs info. Why? Should procfs inodes don't
> have full
> filesematics? And it don't help to unload the module.
If you look at other file systems you'll see they swap the file
operations pointer
^ permalink raw reply [flat|nested] 2+ messages in thread
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