On Tue, 2005-04-19 at 09:31 +0100, [EMAIL PROTECTED] wrote:
> What is the expected value of st_nlink - should it include the number of
> dirs in sub-dirs as well.
> That doesn't sound right to me.
>
yes... It should be like that. Temp-sensor 10.xxxxxxxxxx/. should have
st_nlink=2 since there are no directories in that sensor.
DS1991 02.xxxxxxxxxxx/. should have st_nlink=4 since there are two
directories. (/settings and /pages)
> Once a directory is enumerated, the number of sub-dirs is known and
> contained in a linked list.
> Iterating that list to count the sub-dirs should be trivial.
>
The problem is the root directories on each server like /bus.0/bus.0/.
It could contain:
/bus.0/bus.0/. st_nlink = 7 + xxxx
/bus.0/bus.0/..
/bus.0/bus.0/settings/
/bus.0/bus.0/statistics/
/bus.0/bus.0/structure/
/bus.0/bus.0/system/
/bus.0/bus.0/uncached/
+ some devices
/bus.0/bus.0/10.0000000000/
+ eventually some more directories
/bus.0/bus.0/bus.0/
/bus.0/bus.0/bus.1/
/bus.0/bus.0/bus.2/
/bus.0/bus.0/alarm/
/bus.0/bus.0/simultaneous/
This means that fstat("/bus.0/bus.0/.") have to make a complete
list of the remote server before returning the correct st_nlink,
or perhaps return the number of directories saved in the cache.
If you run 'ls /bus.0/bus.0' it's usually implemented as
while ((entry = readdir(dir)) != NULL) {
if(!(cur = my_fstat(fullname, strrchr(fullname, '/') + 1))) continue;
add_file_to_list(cur);
}
closedir(dir);
print_all_files_in_list();
It makes a fstat() after each entry, and it's hard to know the result
of fstat('/bus.0/bus.0/.') before the whole directory is read once
at least.
I'm sure it will be fixed soon, but I haven't come up to a fool-proof
solution for it that works for many simultaneous readdir() calls. I
think fstat() might return wrong value if new devices (or alarm)
are detected on the second call to readdir().
/Christian
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