| #
52a83196 |
| 26-Mar-2018 |
Andrew Jeffery <andrew@aj.id.au> |
vpnor: Add handler for CREATE_WRITE_WINDOW
The virtual PNOR implementation enforces the read-only attribute of FFS
partitions, which is a departure from how things were handled
previ
vpnor: Add handler for CREATE_WRITE_WINDOW
The virtual PNOR implementation enforces the read-only attribute of FFS
partitions, which is a departure from how things were handled
previously. In the past it was purely up to the host to respect the
flags set on the partition, but nothing prevented the host from
modifying it. Now it's possible for errors to occur when the host
attempts to flush changes back to the flash: mboxd can deny the change.
This denial can happen in a number of circumstances:
1. An explicit WRITE_FLUSH command from the host
2. An implicit WRITE_FLUSH via an explicit CLOSE_WINDOW command
3. An implicit WRITE_FLUSH via CREATE_{READ,WRITE}_WINDOW, which happens
via the implicit CLOSE_WINDOW
All of these attempts will fail if the write to the currently open
window cannot be allowed to succeed. Failing to open a read window due
to failure to flush pending writes is particularly painful, as we are
not able to ever successfully open a window again.
Instead, detect when the host attempts to open a write window over a
anything but a writeable partition. If this case is detected, return an
error for the CREATE_WRITE_WINDOW operation to prevent systemic failures
later on.
Change-Id: I991b6f1570d9b1b384b1024e3bd8a77e5efcd198
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
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| #
943aba06 |
| 26-Mar-2018 |
Andrew Jeffery <andrew@aj.id.au> |
vpnor: Configure a handler table in init_vpnor()
Currently the table just mirrors that which is set by the regular
implementation, however getting to that point requires massaging the
vpnor: Configure a handler table in init_vpnor()
Currently the table just mirrors that which is set by the regular
implementation, however getting to that point requires massaging the
code a little. Thus, separate out this change from one that changes the
behaviour of the commands to improve the readability of the latter
change.
Change-Id: I4007a8a4d508c6d850b8cc878bab8f72bd343498
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
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