Re: [uml-devel] starting an UML image sometimes failed, next (identical) attempt works

["Toralf Förster" <toralf.foerster@gmx.de>]

On 11/19/2014 10:13 PM, Richard Weinberger wrote:
>> console [mc-1] enabled
>> > Failed to initialize ubd device 0 :Couldn't determine size of device's file
> This is ubd_file_size(). Can you find out where exactly it is failing?
> Just add a few printk()s into it.

Did it:

diff --git a/arch/um/drivers/ubd_kern.c b/arch/um/drivers/ubd_kern.c
index e8ab93c..22390f9 100644
--- a/arch/um/drivers/ubd_kern.c
+++ b/arch/um/drivers/ubd_kern.c
@@ -508,19 +508,25 @@ static inline int ubd_file_size(struct ubd *ubd_dev, __u64 *size_out)
        int sector_size;
        int bitmap_offset;

+printk(KERN_INFO "ubd_file_size 0");
        if (ubd_dev->file && ubd_dev->cow.file) {
                file = ubd_dev->cow.file;
+printk(KERN_INFO "ubd_file_size 1");

                goto out;
        }

        fd = os_open_file(ubd_dev->file, of_read(OPENFLAGS()), 0);
+printk(KERN_INFO "ubd_file_size 2");
        if (fd < 0)
                return fd;
+printk(KERN_INFO "ubd_file_size 3");

        err = read_cow_header(file_reader, &fd, &version, &backing_file, \
                &mtime, &size, &sector_size, &align, &bitmap_offset);
        os_close_file(fd);
+printk(KERN_INFO "ubd_file_size 4, err=%i", err);

        if(err == -EINVAL)
                file = ubd_dev->file;




but no result so far (did the issue knows that I do observe him ???). I might test if this happens at the first time the UML image file is mounted using a loop device (after reboot of the host).

-- 
Toralf
pgp key: 0076 E94E


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