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programs that try to use /srv would choke when running
under iostats, because we intercepted operations on the
special, magic fd passing; we should instead give them
access to the real /srv.
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exportfs -d logs 9p traffic to /tmp/exportdb.
-f allows writing to a different file.
exportfs silently continues if it doesn't have
permissions to create or write to /tmp/exportdb.
These are poor behaviors.
A better default is to write to stderr, since it
is 9P debug info that is better immediately printed,
and not user info that is better handled by syslog().
As a result, -f is obsolete and thus removed.
Redirect responsibility is now on rc.
As a side effect, rc will fail if it doesn't
have permissions to write.
exportfs(4) is updated to reflect all changes
and with a better Synopsis.
oexportfs is changed to match exportfs.
oexportfs(4) is updated to reflect all changes.
The Synopsis is not changed due to the number of flags.
Removed -f from iostats.
iostats(4) is updated to reflect all changes.
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The mount() and bind() syscalls return -1 on error,
and the mountid sequence number on success.
The manpage states that the mountid sequence number
is a positive integer, but the kernels implementation
currently uses a unsigned 32-bit integer and does not
guarantee that the mountid will not become negative.
Most code just cares about the error, so test for
the -1 error value only.
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interrupt notes go to the child process, not the filesystem
and filter process.
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old iostats failed to work when builidng the kernel due to old bugs
that where already fixed in exportfs. instead of backporting the fixes,
reimplement iostats as a filter that sits between exportfs and the
process mount. from users perspective, theres no difference.
the result is much smaller and can handle everything that exportfs
can like /srv.
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