cvs commit: src/sys/dev/usb umass.c
imp at FreeBSD.org
Tue Feb 27 22:33:51 UTC 2007
imp 2007-02-27 22:33:50 UTC
FreeBSD src repository
Some USB mass storage devices return the number of sectors in response
to a READ_CAPACITY request rather than the maximum sector (off by one
problem). This causes a huge cascade of errors as the geom tasting
code tries to read the last sector (which isn't really there in the
face of this error). automated tools that manipulate disk labels and
such also have issues.
Create a new quirk READ_CAPACITY_OFFBY1 and add a quirk for the
SanDISK ImageMate that I have that suffers from this problem (the
SDDR-31). It intercepts the READ_CAPACITY response and adjusts it
from number of sectors to max sector for devices with this quirk.
Reading the Linux source suggests that there are a host of
other devices with this issue, including iPods and some popular
cameras. I've not added quirks for them, since I don't have the
devices in front of me to test.
Revision Changes Path
1.142 +18 -0 src/sys/dev/usb/umass.c
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