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MSC exclusive access support. #8814

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iabdalkader
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@iabdalkader iabdalkader commented Jun 24, 2022 •
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For review & feedback

This is just a new idea/proposal/RFC for MSC exclusive access (mainly for ports using Tinyusb). Exclusive access is enforced from higher-level VFS functions, and works like the following:

  • STATUS disk ioctl is implemented and returns "protected" if the block device is used by MSC (mounted by PC).
  • Any write access from the device is denied, by higher-level VFS functions when the disk is protected.
  • When the storage is ejected, the filesystem is remounted, to update the filesystem for the device (and this is done in mp_sched/VM context to avoid critical sections).
  • Any following write access to the filesystem works, because the MSC has released the block device.
  • USB enable/init is moved after _boot.py runs to allow any mkfs calls from _boot.py to create a filesystem, however once USB/MSC is enabled, the ioctl will return protected when status is queried.
  • Finally, the exclusive access is configurable with the macro MICROPY_HW_USB_MSC_EXCLUSIVE_ACCESS.

Example:

>>> import os
>>> os.listdir()
['test.txt', 'README.txt', 'microdot_asyncio.py', 'microdot.py', 'main.py']

>>> f = open("test.txt", "w")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
OSError: 30

# === NOTE: Disk ejected at this point, debug output:
>>> tinyusb_helpers.c: Disk ejected, remount read/write

>>> f = open("test.txt", "w")
>>> f.write("HelloWorld!")
11
>>> f.close()

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@robert-hh

robert-hh
robert-hh reviewed Jun 25, 2022
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shared/runtime/tinyusb_helpers.c
}

void tud_msc_remount(void) {
mp_sched_schedule_node(&mp_remount_sched_node, tud_msc_remount_task);
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At which state will tud_msc_remount be called? Only when the device is ejected? Or is it possible that the PC may remount the drive? I cannot do that with my Linux box. If the board has always go through a power cycle, then it's fine.

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Assuming that a board with MSC support will start in locally write protected mode. What happens if the board is running stand-alone? Can it tell that there is no MSC mounted? Then the drive must be mounted write enabled.

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It gets called when the device is ejected. It may be possible to remount a safely-removed/ejected drive, but I think that disconnects power from the port anyway, I will have to test to confirm. However, I think that's a very unlikely case that shouldn't be handled, not sure if it should remount as read-only after giving write access to the device.

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@robert-hh robert-hh Jun 25, 2022 •
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I'm chewing on the timing issue. At the moment, the board starts with write enabled, to be able to create a file system, if it does not exist. Then it mounts the flash drive, which must be write protected if MSC is used. It could decide based on the status of the IOCTL_STATUS call. But how long does that status change take?

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OK. So the tud_msc_start_stop_cb() is only called on eject. The ud_msc_inquiry_cb() is called on start, as well as the tud_msc_capacity_cb(). So we could use these as indicator, that a PC is attempting to connect.
The tud_msc_test_unit_ready_cb() is called regularly.

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With the softreboot the file is gone. test without the soft reboot.
But I found a possible reason at my set-up: In tud_msc_remount_task() you have a check for len == 1. That is the length of the mount point name. On my set-up, the length is 6. So the remount never happens.
Changing the it to len == 6, the code is executed, and I can single-step it in the debugger. Then I see a strange phenomenon: while single stepping though unmount, remount, .., the PC still shows: "Unmount in progress, please do not remove the drive". Only after the remount function is finished, this message disappears. So it looks like in addition to the non-matching length check, the remount at the board was too early.

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So it looks like in addition to the non-matching length check, the remount at the board was too early.

maybe a false alarm: The PC/USB simple code waits for tud_msc_start_stop_cb() to finish.

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Yes maybe because you're single stepping the function. The remount is scheduled, so this function returns immediately. Anyway, the mount point of the MSC filesystem should be defined somewhere, or even better if it's detected dynamically somehow, but I'm not sure how to do that.

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I single stepped in the tud_msc_remount_task() function. So I know it is called.
At the moment, the internal flash is the first mounted file system. I do not know if we can reliably assume that this is always the case.

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If we do not find a good solution, we could at least defer opening the file system for write until the next soft boot. That's at least safe.

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Thanks for this PR. It helps a lot. I'll carry that over for the MIMXRT port and report the results.

@iabdalkader
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Thanks for this PR. It helps a lot. I'll carry that over for the MIMXRT port and report the results.

I may rework some of the code here, maybe add a vfs_mount option to remount as read-only, define the mount point of the MSC block device or find a better way to detect it, but the functionality should stay the same.

@iabdalkader iabdalkader force-pushed the msc_exclusive_access branch from 4193957 to f22cf66 Compare June 25, 2022 12:09
robert-hh added a commit to robert-hh/micropython that referenced this pull request Jun 25, 2022
@robert-hh
mimxrt: Implement mutual write permission with MSC use.
f687107 
Porting PR micropython#8814 of @iabdalkader to the mimxrt platform.
- When the board is mounted to a PC, local write access is blocked.
- Local write access will be re-enabled again if the disk is ejected.
- If the board is not connected to a PC on start-up, local write access
  is enabled.
- The status of the write access can be determined by bdev.ioctl(7, 0).
  If the device is mounted, it return 1, otherwise 0.
robert-hh added a commit to robert-hh/micropython that referenced this pull request Jun 25, 2022
@robert-hh
mimxrt: Implement mutual write permission with MSC use.
ebd6230 
Porting PR micropython#8814 of @iabdalkader to the mimxrt platform.
- When the board is mounted to a PC, local write access is blocked.
- Local write access will be re-enabled again if the disk is ejected.
- If the board is not connected to a PC on start-up, local write access
  is enabled.
- The status of the write access can be determined by bdev.ioctl(7, 0).
  If the device is mounted, it return 1, otherwise 0.
robert-hh added a commit to robert-hh/micropython that referenced this pull request Jun 25, 2022
@robert-hh
mimxrt: Implement mutual write permission with MSC use.
0d13276 
Porting PR micropython#8814 of @iabdalkader to the mimxrt platform.
- When the board is mounted to a PC, local write access is blocked.
- Local write access will be re-enabled again if the disk is ejected.
- If the board is not connected to a PC on start-up, local write access
  is enabled.
- The status of the write access can be determined by bdev.ioctl(7, 0).
  If the device is mounted to a PAC and thus local write access is
  blocked, it return 1, otherwise 0.
- low level write/erase using the block device calls are still possible.
  It is up to the user to check the device status ahead.
@iabdalkader iabdalkader force-pushed the msc_exclusive_access branch from f22cf66 to 3ab4efd Compare June 25, 2022 15:13
@iabdalkader iabdalkader force-pushed the msc_exclusive_access branch from 3ab4efd to fd327d2 Compare June 25, 2022 16:29
@robert-hh robert-hh mentioned this pull request Jun 25, 2022
Closed
robert-hh added a commit to robert-hh/micropython that referenced this pull request Jun 26, 2022
@robert-hh
mimxrt: Implement mutual write permission with MSC use.
131f98d 
Porting PR micropython#8814 of @iabdalkader to the mimxrt platform.
- When the board is mounted to a PC, local write access is blocked.
- Local write access will be re-enabled again if the disk is ejected.
- If the board is not connected to a PC on start-up, local write access
  is enabled.
- The status of the write access can be determined by bdev.ioctl(7, 0).
  If the device is mounted to a PAC and thus local write access is
  blocked, it return 1, otherwise 0.
- low level write/erase using the block device calls are still possible.
  It is up to the user to check the device status ahead.
robert-hh added a commit to robert-hh/micropython that referenced this pull request Jul 1, 2022
@robert-hh
mimxrt: Implement mutual write permission with MSC use.
1b389d4 
Porting PR micropython#8814 of @iabdalkader to the mimxrt platform.
- When the board is mounted to a PC, local write access is blocked.
- Local write access will be re-enabled again if the disk is ejected.
- If the board is not connected to a PC on start-up, local write access
  is enabled.
- The status of the write access can be determined by bdev.ioctl(7, 0).
  If the device is mounted to a PAC and thus local write access is
  blocked, it return 1, otherwise 0.
- low level write/erase using the block device calls are still possible.
  It is up to the user to check the device status ahead.
robert-hh added a commit to robert-hh/micropython that referenced this pull request Jul 5, 2022
@robert-hh
mimxrt: Implement mutual write permission with MSC use.
421e82c 
Porting PR micropython#8814 of @iabdalkader to the mimxrt platform.
- When the board is mounted to a PC, local write access is blocked.
- Local write access will be re-enabled again if the disk is ejected.
- If the board is not connected to a PC on start-up, local write access
  is enabled.
- The status of the write access can be determined by bdev.ioctl(7, 0).
  If the device is mounted to a PAC and thus local write access is
  blocked, it return 1, otherwise 0.
- low level write/erase using the block device calls are still possible.
  It is up to the user to check the device status ahead.
robert-hh added a commit to robert-hh/micropython that referenced this pull request Jul 18, 2022
@robert-hh
mimxrt: Implement mutual write permission with MSC use.
4e09bca 
Porting PR micropython#8814 of @iabdalkader to the mimxrt platform.
- When the board is mounted to a PC, local write access is blocked.
- Local write access will be re-enabled again if the disk is ejected.
- If the board is not connected to a PC on start-up, local write access
  is enabled.
- The status of the write access can be determined by bdev.ioctl(7, 0).
  If the device is mounted to a PAC and thus local write access is
  blocked, it return 1, otherwise 0.
- low level write/erase using the block device calls are still possible.
  It is up to the user to check the device status ahead.
robert-hh added a commit to robert-hh/micropython that referenced this pull request Jul 20, 2022
@robert-hh
mimxrt: Implement mutual write permission with MSC use.
1f302c8 
Porting PR micropython#8814 of @iabdalkader to the mimxrt platform.
- When the board is mounted to a PC, local write access is blocked.
- Local write access will be re-enabled again if the disk is ejected.
- If the board is not connected to a PC on start-up, local write access
  is enabled.
- The status of the write access can be determined by bdev.ioctl(7, 0).
  If the device is mounted to a PAC and thus local write access is
  blocked, it return 1, otherwise 0.
- low level write/erase using the block device calls are still possible.
  It is up to the user to check the device status ahead.
robert-hh added a commit to robert-hh/micropython that referenced this pull request Jul 29, 2022
@robert-hh
mimxrt: Implement mutual write permission with MSC use.
752e8cd 
Porting PR micropython#8814 of @iabdalkader to the mimxrt platform.
- When the board is mounted to a PC, local write access is blocked.
- Local write access will be re-enabled again if the disk is ejected.
- If the board is not connected to a PC on start-up, local write access
  is enabled.
- The status of the write access can be determined by bdev.ioctl(7, 0).
  If the device is mounted to a PAC and thus local write access is
  blocked, it return 1, otherwise 0.
- low level write/erase using the block device calls are still possible.
  It is up to the user to check the device status ahead.
@robert-hh robert-hh mentioned this pull request Aug 29, 2022
Open
robert-hh added a commit to robert-hh/micropython that referenced this pull request Aug 30, 2022
@robert-hh
mimxrt: Implement mutual write permission with MSC use.
34223b8 
Porting PR micropython#8814 of @iabdalkader to the mimxrt platform.
- When the board is mounted to a PC, local write access is blocked.
- Local write access will be re-enabled again if the disk is ejected.
- If the board is not connected to a PC on start-up, local write access
  is enabled.
- The status of the write access can be determined by bdev.ioctl(7, 0).
  If the device is mounted to a PAC and thus local write access is
  blocked, it return 1, otherwise 0.
- low level write/erase using the block device calls are still possible.
  It is up to the user to check the device status ahead.
robert-hh added a commit to robert-hh/micropython that referenced this pull request Sep 16, 2022
@robert-hh
mimxrt: Implement mutual write permission with MSC use.
a1c59a2 
Porting PR micropython#8814 of @iabdalkader to the mimxrt platform.
- When the board is mounted to a PC, local write access is blocked.
- Local write access will be re-enabled again if the disk is ejected.
- If the board is not connected to a PC on start-up, local write access
  is enabled.
- The status of the write access can be determined by bdev.ioctl(7, 0).
  If the device is mounted to a PAC and thus local write access is
  blocked, it return 1, otherwise 0.
- low level write/erase using the block device calls are still possible.
  It is up to the user to check the device status ahead.
robert-hh added a commit to robert-hh/micropython that referenced this pull request Nov 17, 2022
@robert-hh
mimxrt: Implement mutual write permission with MSC use.
943a6fe 
Porting PR micropython#8814 of @iabdalkader to the mimxrt platform.
- When the board is mounted to a PC, local write access is blocked.
- Local write access will be re-enabled again if the disk is ejected.
- If the board is not connected to a PC on start-up, local write access
  is enabled.
- The status of the write access can be determined by bdev.ioctl(7, 0).
  If the device is mounted to a PAC and thus local write access is
  blocked, it return 1, otherwise 0.
- low level write/erase using the block device calls are still possible.
  It is up to the user to check the device status ahead.
robert-hh added a commit to robert-hh/micropython that referenced this pull request Nov 18, 2022
@robert-hh
mimxrt: Implement mutual write permission with MSC use.
488bc09 
Porting PR micropython#8814 of @iabdalkader to the mimxrt platform.
- When the board is mounted to a PC, local write access is blocked.
- Local write access will be re-enabled again if the disk is ejected.
- If the board is not connected to a PC on start-up, local write access
  is enabled.
- The status of the write access can be determined by bdev.ioctl(7, 0).
  If the device is mounted to a PAC and thus local write access is
  blocked, it return 1, otherwise 0.
- low level write/erase using the block device calls are still possible.
  It is up to the user to check the device status ahead.
robert-hh added a commit to robert-hh/micropython that referenced this pull request Dec 15, 2022
@robert-hh
mimxrt: Implement mutual write permission with MSC use.
2c66f1e 
Porting PR micropython#8814 of @iabdalkader to the mimxrt platform.
- When the board is mounted to a PC, local write access is blocked.
- Local write access will be re-enabled again if the disk is ejected.
- If the board is not connected to a PC on start-up, local write access
  is enabled.
- The status of the write access can be determined by bdev.ioctl(7, 0).
  If the device is mounted to a PAC and thus local write access is
  blocked, it return 1, otherwise 0.
- low level write/erase using the block device calls are still possible.
  It is up to the user to check the device status ahead.
robert-hh added a commit to robert-hh/micropython that referenced this pull request Mar 7, 2023
@robert-hh
mimxrt: Implement mutual write permission with MSC use.
722e226 
Porting PR micropython#8814 of @iabdalkader to the mimxrt platform.
- When the board is mounted to a PC, local write access is blocked.
- Local write access will be re-enabled again if the disk is ejected.
- If the board is not connected to a PC on start-up, local write access
  is enabled.
- The status of the write access can be determined by bdev.ioctl(7, 0).
  If the device is mounted to a PAC and thus local write access is
  blocked, it return 1, otherwise 0.
- low level write/erase using the block device calls are still possible.
  It is up to the user to check the device status ahead.
robert-hh added a commit to robert-hh/micropython that referenced this pull request Mar 23, 2023
@robert-hh
mimxrt: Implement mutual write permission with MSC use.
268f500 
Porting PR micropython#8814 of @iabdalkader to the mimxrt platform.
- When the board is mounted to a PC, local write access is blocked.
- Local write access will be re-enabled again if the disk is ejected.
- If the board is not connected to a PC on start-up, local write access
  is enabled.
- The status of the write access can be determined by bdev.ioctl(7, 0).
  If the device is mounted to a PAC and thus local write access is
  blocked, it return 1, otherwise 0.
- low level write/erase using the block device calls are still possible.
  It is up to the user to check the device status ahead.
robert-hh added a commit to robert-hh/micropython that referenced this pull request May 4, 2023
@robert-hh
mimxrt: Implement mutual write permission with MSC use.
228996d 
Porting PR micropython#8814 of @iabdalkader to the mimxrt platform.
- When the board is mounted to a PC, local write access is blocked.
- Local write access will be re-enabled again if the disk is ejected.
- If the board is not connected to a PC on start-up, local write access
  is enabled.
- The status of the write access can be determined by bdev.ioctl(7, 0).
  If the device is mounted to a PAC and thus local write access is
  blocked, it return 1, otherwise 0.
- low level write/erase using the block device calls are still possible.
  It is up to the user to check the device status ahead.
robert-hh added a commit to robert-hh/micropython that referenced this pull request May 19, 2023
@robert-hh
mimxrt: Implement mutual write permission with MSC use.
8a8d135 
Porting PR micropython#8814 of @iabdalkader to the mimxrt platform.
- When the board is mounted to a PC, local write access is blocked.
- Local write access will be re-enabled again if the disk is ejected.
- If the board is not connected to a PC on start-up, local write access
  is enabled.
- The status of the write access can be determined by bdev.ioctl(7, 0).
  If the device is mounted to a PAC and thus local write access is
  blocked, it return 1, otherwise 0.
- low level write/erase using the block device calls are still possible.
  It is up to the user to check the device status ahead.

Signed-off-by: robert-hh <robert@hammelrath.com>
robert-hh added a commit to robert-hh/micropython that referenced this pull request Jun 2, 2023
@robert-hh
mimxrt: Implement mutual write permission with MSC use.
21432ba 
Porting PR micropython#8814 of @iabdalkader to the mimxrt platform.
- When the board is mounted to a PC, local write access is blocked.
- Local write access will be re-enabled again if the disk is ejected.
- If the board is not connected to a PC on start-up, local write access
  is enabled.
- The status of the write access can be determined by bdev.ioctl(7, 0).
  If the device is mounted to a PAC and thus local write access is
  blocked, it return 1, otherwise 0.
- low level write/erase using the block device calls are still possible.
  It is up to the user to check the device status ahead.

Signed-off-by: robert-hh <robert@hammelrath.com>
@iabdalkader iabdalkader deleted the msc_exclusive_access branch June 24, 2023 07:45
robert-hh added a commit to robert-hh/micropython that referenced this pull request Jun 26, 2023
@robert-hh
mimxrt: Implement mutual write permission with MSC use.
318263b 
Porting PR micropython#8814 of @iabdalkader to the mimxrt platform.
- When the board is mounted to a PC, local write access is blocked.
- Local write access will be re-enabled again if the disk is ejected.
- If the board is not connected to a PC on start-up, local write access
  is enabled.
- The status of the write access can be determined by bdev.ioctl(7, 0).
  If the device is mounted to a PAC and thus local write access is
  blocked, it return 1, otherwise 0.
- low level write/erase using the block device calls are still possible.
  It is up to the user to check the device status ahead.

Signed-off-by: robert-hh <robert@hammelrath.com>
robert-hh added a commit to robert-hh/micropython that referenced this pull request Jul 2, 2023
@robert-hh
mimxrt: Implement mutual write permission with MSC use.
4ebee12 
Porting PR micropython#8814 of @iabdalkader to the mimxrt platform.
- When the board is mounted to a PC, local write access is blocked.
- Local write access will be re-enabled again if the disk is ejected.
- If the board is not connected to a PC on start-up, local write access
  is enabled.
- The status of the write access can be determined by bdev.ioctl(7, 0).
  If the device is mounted to a PAC and thus local write access is
  blocked, it return 1, otherwise 0.
- low level write/erase using the block device calls are still possible.
  It is up to the user to check the device status ahead.

Signed-off-by: robert-hh <robert@hammelrath.com>
robert-hh added a commit to robert-hh/micropython that referenced this pull request Dec 9, 2023
@robert-hh
mimxrt: Implement mutual write permission with MSC use.
0812cae 
Porting PR micropython#8814 of @iabdalkader to the mimxrt platform.
- When the board is mounted to a PC, local write access is blocked.
- Local write access will be re-enabled again if the disk is ejected.
- If the board is not connected to a PC on start-up, local write access
  is enabled.
- The status of the write access can be determined by bdev.ioctl(7, 0).
  If the device is mounted to a PAC and thus local write access is
  blocked, it return 1, otherwise 0.
- low level write/erase using the block device calls are still possible.
  It is up to the user to check the device status ahead.

Signed-off-by: robert-hh <robert@hammelrath.com>
robert-hh added a commit to robert-hh/micropython that referenced this pull request May 24, 2024
@robert-hh
mimxrt: Implement mutual write permission with MSC use.
bebc889 
Porting PR micropython#8814 of @iabdalkader to the mimxrt platform.
- When the board is mounted to a PC, local write access is blocked.
- Local write access will be re-enabled again if the disk is ejected.
- If the board is not connected to a PC on start-up, local write access
  is enabled.
- The status of the write access can be determined by bdev.ioctl(7, 0).
  If the device is mounted to a PAC and thus local write access is
  blocked, it return 1, otherwise 0.
- low level write/erase using the block device calls are still possible.
  It is up to the user to check the device status ahead.

Signed-off-by: robert-hh <robert@hammelrath.com>
robert-hh added a commit to robert-hh/micropython that referenced this pull request Jun 1, 2024
@robert-hh
mimxrt: Implement mutual write permission with MSC use.
f35e1b9 
Porting PR micropython#8814 of @iabdalkader to the mimxrt platform.
- When the board is mounted to a PC, local write access is blocked.
- Local write access will be re-enabled again if the disk is ejected.
- If the board is not connected to a PC on start-up, local write access
  is enabled.
- The status of the write access can be determined by bdev.ioctl(7, 0).
  If the device is mounted to a PAC and thus local write access is
  blocked, it return 1, otherwise 0.
- low level write/erase using the block device calls are still possible.
  It is up to the user to check the device status ahead.

Signed-off-by: robert-hh <robert@hammelrath.com>
robert-hh added a commit to robert-hh/micropython that referenced this pull request Sep 4, 2024
@robert-hh
mimxrt: Implement mutual write permission with MSC use.
81329bc 
Porting PR micropython#8814 of @iabdalkader to the mimxrt platform.
- When the board is mounted to a PC, local write access is blocked.
- Local write access will be re-enabled again if the disk is ejected.
- If the board is not connected to a PC on start-up, local write access
  is enabled.
- The status of the write access can be determined by bdev.ioctl(7, 0).
  If the device is mounted to a PAC and thus local write access is
  blocked, it return 1, otherwise 0.
- low level write/erase using the block device calls are still possible.
  It is up to the user to check the device status ahead.

Signed-off-by: robert-hh <robert@hammelrath.com>
robert-hh added a commit to robert-hh/micropython that referenced this pull request Oct 27, 2024
@robert-hh
mimxrt: Implement mutual write permission with MSC use.
9b6cd85 
Porting PR micropython#8814 of @iabdalkader to the mimxrt platform.
- When the board is mounted to a PC, local write access is blocked.
- Local write access will be re-enabled again if the disk is ejected.
- If the board is not connected to a PC on start-up, local write access
  is enabled.
- The status of the write access can be determined by bdev.ioctl(7, 0).
  If the device is mounted to a PAC and thus local write access is
  blocked, it return 1, otherwise 0.
- low level write/erase using the block device calls are still possible.
  It is up to the user to check the device status ahead.

Signed-off-by: robert-hh <robert@hammelrath.com>
robert-hh added a commit to robert-hh/micropython that referenced this pull request Nov 12, 2024
@robert-hh
mimxrt: Implement mutual write permission with MSC use.
b1d2888 
Porting PR micropython#8814 of @iabdalkader to the mimxrt platform.
- When the board is mounted to a PC, local write access is blocked.
- Local write access will be re-enabled again if the disk is ejected.
- If the board is not connected to a PC on start-up, local write access
  is enabled.
- The status of the write access can be determined by bdev.ioctl(7, 0).
  If the device is mounted to a PAC and thus local write access is
  blocked, it return 1, otherwise 0.
- low level write/erase using the block device calls are still possible.
  It is up to the user to check the device status ahead.

Signed-off-by: robert-hh <robert@hammelrath.com>
robert-hh added a commit to robert-hh/micropython that referenced this pull request Jan 16, 2025
@robert-hh
mimxrt: Implement mutual write permission with MSC use.
4e2e6b3 
Porting PR micropython#8814 of @iabdalkader to the mimxrt platform.
- When the board is mounted to a PC, local write access is blocked.
- Local write access will be re-enabled again if the disk is ejected.
- If the board is not connected to a PC on start-up, local write access
  is enabled.
- The status of the write access can be determined by bdev.ioctl(7, 0).
  If the device is mounted to a PAC and thus local write access is
  blocked, it return 1, otherwise 0.
- low level write/erase using the block device calls are still possible.
  It is up to the user to check the device status ahead.

Signed-off-by: robert-hh <robert@hammelrath.com>
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@iabdalkader @robert-hh @dpgeorge