On Sunday 27 June 2010 10:16:26 [email protected] wrote:
> 16283 mount("/dev/sda11", "/mnt/tmp", "yaffs", MS_MGC_VAL, NULL) = -1
> ENODEV (No such device)
> 16283 rt_sigprocmask(SIG_UNBLOCK, ~[TRAP SEGV RTMIN RT_1], NULL, 8) = 0
> 16283 open("/proc/filesystems", O_RDONLY|O_LARGEFILE) = 3
> 16283 fstat64(3, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
> 16283 mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS,
> -1, 0) = 0xb7c38000
The big fluffy mount command is getting back the same ENODEV from the kernel
we're getting back, and is then opening /proc/filesystems to explicitly check
and see if "yaffs" is listed in there.
I.E. they added extra code to give a more informative error message, which is
one if the reasons their implementation is bigger than our implementation.
As far as I can tell, what you're saying is "The busybox implementation is
smaller and simpler, which does not work well for me, but I don't want to use
the other implementation, instead I would like you to add extra code to make
busybox bigger".
Possibly this is another thing that Denys could have his CONFIG_DESKTOP switch
do? (The point of that thing is to make busybox big and fluffy, isn't it?)
By the way, ENODEV doesn't really mean "no device", it essentially means no
such _driver_. In this case, the missing driver is the filesystem driver, not
the block device driver. (Note that in the case of tmpfs, procfs, smbfs, and
so on, there _is_ no block device. Those filesystem drivers talk to something
other than a block device, and the "target" argument to mount(2) may be a
network address or even just a comment field.)
In fact, according to the man 2 mount:
ENODEV filesystemtype not configured in the kernel.
So that implies this error code from this system call is _always_ due to the
filesystem driver. The C library is translating that errno into 'No such
device", but that's an oversimplification. No driver is taking responsibility
for this request.
Rob
--
GPLv3: as worthy a successor as The Phantom Meanace, as timely as Duke Nukem
Forever, and as welcome as New Coke.
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