be set. Linux NFS servers (at least) reset suid/sgid bits if a write
happens afterwards. Add a comment why this is done.
This fixes system builds on diskless systems for me where suid bits
were missing after install(1).
Approved by yamt.
make sillyrename (try to) use LINK operation rather than RENAME.
PR/33861 from Jed Davis. he provided the almost same patch.
according to him, it also happen to be what opensolaris does in this case.
from the PR:
> In nfs_rename(), if the destination appears to exist and is "in use"
> (this check is apparently satisfied even if the file isn't in use by
> anything except the rename itself), it will sillyrename it, then delete
> the sillyrenamed file even if the rename fails -- for instance, because
> the "from" file no longer exists on the server.
> mkdir a b; touch a/x; perl -e 'fork(); rename("a/x","b/x") or die "$!\n"'
>
> Afterwards, neither a/x nor b/x will exist.
> 1) Lookup of b/x; fails with NOENT.
> 2) Rename from a/x to b/x; succeeds.
> 3) Lookup of b/x; fails with NOENT.
> 4) Rename from b/x to b/.nfsA23a3; succeeds.
> 5) Rename from a/x to b/x; fails with NOENT.
> 6) Remove of b/.nfsA23a3; succeeds.
- struct timeval time is gone
time.tv_sec -> time_second
- struct timeval mono_time is gone
mono_time.tv_sec -> time_uptime
- access to time via
{get,}{micro,nano,bin}time()
get* versions are fast but less precise
- support NTP nanokernel implementation (NTP API 4)
- further reading:
Timecounter Paper: http://phk.freebsd.dk/pubs/timecounter.pdf
NTP Nanokernel: http://www.eecis.udel.edu/~mills/ntp/html/kern.html
- use vmspace rather than proc or lwp where appropriate.
the latter is more natural to specify an address space.
(and less likely to be abused for random purposes.)
- fix a swdmover race.
of curproc (where uio->uio_procp should be used?). Don't do this
for nfs_commit(), because yamt says it is possibly wrong.
2. nfs_doio() does not use struct proc; remove it and the code to compute it.
3. use copyin_proc() and copyout_proc() instead of copyin() and copyout().
4. check return of copyout_proc(). and mark return from copyin_proc() XXX
5. Eliminate check p == curproc assertion check from nfs_write;
nfs_read does not have it and we might be called in a different
process context anyway (PR 20138).
- catchup to in_ifaddr -> in_ifaddrhead rename.
XXX the address on the top of in_ifaddrhead is likely 127.0.0.1.
using it to construct the verifier doesn't make much sense.
maybe it's better to use some uuid or ip_randomid-like method.
- "intrusive" dirops now have more chances to get benefits from dnlc.
- fixes a deadlock due to vnode locking order inversion.
nfs_create and others: purge stale dnlc entries
as nfs_lookup() no longer does it automatically.
