Qemu cannot recognize file changes immediately
I'm completing Brokenthorn OS tutorial where I create a virtual floppy in Ubuntu using MSDOSFS command and then I make changes to this virtual floppy, like changing its MBR using DD command and copying and removing files, the problem is when I make some changes and then run it on Qemu, it doesn't detect changes and shows result as if I hadn't made any change to the floppy drive, but after running and exit qemu some times, it then starts showing me correct result. Why doesn't qemu detect changes immediately?
qemu mount bootloader osdev
edited Nov 26 '18 at 1:41
Michael Petch
26.4k556105
asked Nov 25 '18 at 6:23
Amir KhanAmir Khan
104
add a comment |
I'm completing Brokenthorn OS tutorial where I create a virtual floppy in Ubuntu using MSDOSFS command and then I make changes to this virtual floppy, like changing its MBR using DD command and copying and removing files, the problem is when I make some changes and then run it on Qemu, it doesn't detect changes and shows result as if I hadn't made any change to the floppy drive, but after running and exit qemu some times, it then starts showing me correct result. Why doesn't qemu detect changes immediately?
qemu mount bootloader osdev
edited Nov 26 '18 at 1:41
Michael Petch
26.4k556105
asked Nov 25 '18 at 6:23
Amir KhanAmir Khan
104
Hi, thanks for your response. Do you mean I should mount virtual floppy copy files to it and then unmount it and then use it on qemu?
– Amir Khan
Nov 25 '18 at 6:40
I create virtual floppy images using msdosfs command, then mount a folder on it using, "mount imagename.img foldername" command then I copy files to folder using simple cp.
– Amir Khan
Nov 25 '18 at 6:46
1
Thank you so much, your solution worked. Now its working very well. THANKS.
– Amir Khan
Nov 25 '18 at 6:59
add a comment |
I'm completing Brokenthorn OS tutorial where I create a virtual floppy in Ubuntu using MSDOSFS command and then I make changes to this virtual floppy, like changing its MBR using DD command and copying and removing files, the problem is when I make some changes and then run it on Qemu, it doesn't detect changes and shows result as if I hadn't made any change to the floppy drive, but after running and exit qemu some times, it then starts showing me correct result. Why doesn't qemu detect changes immediately?
qemu mount bootloader osdev
edited Nov 26 '18 at 1:41
Michael Petch
26.4k556105
asked Nov 25 '18 at 6:23
Amir KhanAmir Khan
104
I'm completing Brokenthorn OS tutorial where I create a virtual floppy in Ubuntu using MSDOSFS command and then I make changes to this virtual floppy, like changing its MBR using DD command and copying and removing files, the problem is when I make some changes and then run it on Qemu, it doesn't detect changes and shows result as if I hadn't made any change to the floppy drive, but after running and exit qemu some times, it then starts showing me correct result. Why doesn't qemu detect changes immediately?
qemu mount bootloader osdev
qemu mount bootloader osdev
edited Nov 26 '18 at 1:41
Michael Petch
26.4k556105
asked Nov 25 '18 at 6:23
Amir KhanAmir Khan
104
edited Nov 26 '18 at 1:41
Michael Petch
26.4k556105
asked Nov 25 '18 at 6:23
Amir KhanAmir Khan
104
edited Nov 26 '18 at 1:41
Michael Petch
26.4k556105
edited Nov 26 '18 at 1:41
Michael Petch
26.4k556105
edited Nov 26 '18 at 1:41
Michael Petch
26.4k556105
26.4k556105
asked Nov 25 '18 at 6:23
Amir KhanAmir Khan
104
asked Nov 25 '18 at 6:23
Amir KhanAmir Khan
104
asked Nov 25 '18 at 6:23
Amir KhanAmir Khan
104
104
Hi, thanks for your response. Do you mean I should mount virtual floppy copy files to it and then unmount it and then use it on qemu?
– Amir Khan
Nov 25 '18 at 6:40
I create virtual floppy images using msdosfs command, then mount a folder on it using, "mount imagename.img foldername" command then I copy files to folder using simple cp.
– Amir Khan
Nov 25 '18 at 6:46
1
Thank you so much, your solution worked. Now its working very well. THANKS.
– Amir Khan
Nov 25 '18 at 6:59
add a comment |
Hi, thanks for your response. Do you mean I should mount virtual floppy copy files to it and then unmount it and then use it on qemu?
– Amir Khan
Nov 25 '18 at 6:40
I create virtual floppy images using msdosfs command, then mount a folder on it using, "mount imagename.img foldername" command then I copy files to folder using simple cp.
– Amir Khan
Nov 25 '18 at 6:46
1
Thank you so much, your solution worked. Now its working very well. THANKS.
– Amir Khan
Nov 25 '18 at 6:59
Hi, thanks for your response. Do you mean I should mount virtual floppy copy files to it and then unmount it and then use it on qemu?
– Amir Khan
Nov 25 '18 at 6:40
Hi, thanks for your response. Do you mean I should mount virtual floppy copy files to it and then unmount it and then use it on qemu?
– Amir Khan
Nov 25 '18 at 6:40
I create virtual floppy images using msdosfs command, then mount a folder on it using, "mount imagename.img foldername" command then I copy files to folder using simple cp.
– Amir Khan
Nov 25 '18 at 6:46
I create virtual floppy images using msdosfs command, then mount a folder on it using, "mount imagename.img foldername" command then I copy files to folder using simple cp.
– Amir Khan
Nov 25 '18 at 6:46
1
1
Thank you so much, your solution worked. Now its working very well. THANKS.
– Amir Khan
Nov 25 '18 at 6:59
Thank you so much, your solution worked. Now its working very well. THANKS.
– Amir Khan
Nov 25 '18 at 6:59
add a comment |
1 Answer
1
active
oldest
votes
When you are finished updating / deleting / copying files you should use the umount command to unmount the directory when finished. That will ensure all the file updates are complete. At that point try running it in QEMU. My guess is that you are keeping the file system mounted while running QEMU. That can cause the type of problems you seem to be observing.
answered Nov 25 '18 at 7:01
Michael PetchMichael Petch
26.4k556105
add a comment |
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1 Answer
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votes
When you are finished updating / deleting / copying files you should use the umount command to unmount the directory when finished. That will ensure all the file updates are complete. At that point try running it in QEMU. My guess is that you are keeping the file system mounted while running QEMU. That can cause the type of problems you seem to be observing.
answered Nov 25 '18 at 7:01
Michael PetchMichael Petch
26.4k556105
add a comment |
When you are finished updating / deleting / copying files you should use the umount command to unmount the directory when finished. That will ensure all the file updates are complete. At that point try running it in QEMU. My guess is that you are keeping the file system mounted while running QEMU. That can cause the type of problems you seem to be observing.
answered Nov 25 '18 at 7:01
Michael PetchMichael Petch
26.4k556105
add a comment |
When you are finished updating / deleting / copying files you should use the umount command to unmount the directory when finished. That will ensure all the file updates are complete. At that point try running it in QEMU. My guess is that you are keeping the file system mounted while running QEMU. That can cause the type of problems you seem to be observing.
answered Nov 25 '18 at 7:01
Michael PetchMichael Petch
26.4k556105
When you are finished updating / deleting / copying files you should use the umount command to unmount the directory when finished. That will ensure all the file updates are complete. At that point try running it in QEMU. My guess is that you are keeping the file system mounted while running QEMU. That can cause the type of problems you seem to be observing.
answered Nov 25 '18 at 7:01
Michael PetchMichael Petch
26.4k556105
answered Nov 25 '18 at 7:01
Michael PetchMichael Petch
26.4k556105
answered Nov 25 '18 at 7:01
Michael PetchMichael Petch
26.4k556105
answered Nov 25 '18 at 7:01
Michael PetchMichael Petch
26.4k556105
26.4k556105
add a comment |
add a comment |
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Hi, thanks for your response. Do you mean I should mount virtual floppy copy files to it and then unmount it and then use it on qemu?
– Amir Khan
Nov 25 '18 at 6:40
I create virtual floppy images using msdosfs command, then mount a folder on it using, "mount imagename.img foldername" command then I copy files to folder using simple cp.
– Amir Khan
Nov 25 '18 at 6:46
1
Thank you so much, your solution worked. Now its working very well. THANKS.
– Amir Khan
Nov 25 '18 at 6:59