Furthermore, -r doesn't work either:
[EMAIL PROTECTED]> pfexec truss -f -t mount mount -F pcfs -r
/dev/dsk/c2t0d0p0:1 /mnt
3794: mount("/dev/dsk/c2t0d0p0:1", "/mnt", MS_RDONLY|MS_OPTIONSTR,
"pcfs", 0x00000000, 0, 0x08063240, 1024) Err#30 EROFS
mount: Read-only file system
-- Garrett
Garrett D'Amore wrote:
> So I'm trying to work with SDcard media, which can be read-only, or
> read-write, and the SCSI layer.
>
> What I'm doing in SCSA, is if the "lock" (write-protect switch) is set,
> indicating in the mode-sense data that the device is read-only.
> (DEVSPEC = 0x80).
>
> This does seem to mostly work, *except* that the end result is that I
> cannot mount PCFS filesystems with this flag set. I get back:
>
> [EMAIL PROTECTED]> pfexec truss -f -t mount mount -F pcfs -o ro
> /dev/dsk/c2t0d0p0:1 /mnt
> 3708: mount("/dev/dsk/c2t0d0p0:1", "/mnt", MS_OPTIONSTR, "pcfs",
> 0x00000000, 0, 0x08063240, 1024) Err#30 EROFS
> mount: Read-only file system
>
> I've not drilled down to figure out where the EROFS is coming from, but
> it does strike me that if I'm asking pcfs to mount the filesystem
> read-only (with -o ro) it shouldn't try to open the device for writing.
> (The sd(7d) driver refuses open's of read-only devices when the writable
> bit is passed into open. I've not looked at the implementation of
> mount, but I *believe* it boils down to an intra-kernel call of
> sdopen(), thereby running up against the checks against the check in
> sdopen() for oflag containing FWRITE.
>
> So, what am I missing? Shouldn't -o ro mounts of PCFS formatted media
> be acceptable? (Interestingly enough, it appears that fd has a similar
> check for floppy disks:
>
> /*
> * if opening for writing, check write protect on diskette
> */
> if ((flag & FWRITE) && (fdp->d_obj->fj_flags & FUNIT_WPROT)) {
> sema_v(&fdp->d_ocsem);
> return (EROFS);
> }
>
> But I'm unable to test this at the moment, lacking systems with floppy
> drives! (I may try to track one down...)
>
> -- Garrett
>
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