linux-toradex.git/fs/lockd/svcproc.c, branch v2.6.22.13

lockd: add code to handle deferred lock requests

2007-05-07T00:38:50+00:00

Rewrite nlmsvc_lock() to use the asynchronous interface.

As with testlock, we answer nlm requests in nlmsvc_lock by first looking up
the block and then using the results we find in the block if B_QUEUED is
set, and calling vfs_lock_file() otherwise.

If this a new lock request and we get -EINPROGRESS return on a non-blocking
request then we defer the request.

Also modify nlmsvc_unlock() to call the filesystem method if appropriate.

Signed-off-by: Marc Eshel 
Signed-off-by: J. Bruce Fields

lockd: handle test_lock deferrals

2007-05-07T00:38:50+00:00

Rewrite nlmsvc_testlock() to use the new asynchronous interface: instead of
immediately doing a posix_test_lock(), we first look for a matching block.
If the subsequent test_lock returns anything other than -EINPROGRESS, we
then remove the block we've found and return the results.

If it returns -EINPROGRESS, then we defer the lock request.

In the case where the block we find in the first step has B_QUEUED set,
we bypass the vfs_test_lock entirely, instead using the block to decide how
to respond:
	with nlm_lck_denied if B_TIMED_OUT is set.
	with nlm_granted if B_GOT_CALLBACK is set.
	by dropping if neither B_TIMED_OUT nor B_GOT_CALLBACK is set

Signed-off-by: Marc Eshel 
Signed-off-by: J. Bruce Fields

lockd: pass cookie in nlmsvc_testlock

2007-05-07T00:38:50+00:00

Change NLM internal interface to pass more information for test lock; we
need this to make sure the cookie information is pushed down to the place
where we do request deferral, which is handled for testlock by the
following patch.

Signed-off-by: Marc Eshel 
Signed-off-by: J. Bruce Fields

[PATCH] knfsd: SUNRPC: Provide room in svc_rqst for larger addresses

2007-02-12T17:48:36+00:00

Expand the rq_addr field to allow it to contain larger addresses.

Specifically, we replace a 'sockaddr_in' with a 'sockaddr_storage', then
everywhere the 'sockaddr_in' was referenced, we use instead an accessor
function (svc_addr_in) which safely casts the _storage to _in.

Signed-off-by: Chuck Lever 
Cc: Aurelien Charbon 
Signed-off-by: Neil Brown 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] knfsd: SUNRPC: Add a function to format the address in an svc_rqst for printing

2007-02-12T17:48:35+00:00

There are loads of places where the RPC server assumes that the rq_addr fields
contains an IPv4 address.  Top among these are error and debugging messages
that display the server's IP address.

Let's refactor the address printing into a separate function that's smart
enough to figure out the difference between IPv4 and IPv6 addresses.

Signed-off-by: Chuck Lever 
Cc: Aurelien Charbon 
Signed-off-by: Neil Brown 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

NLM: fix print format for tk_pid

2006-12-06T15:46:54+00:00

The tk_pid field is an unsigned short.  The proper print format specifier for
that type is %5u, not %4d.

Signed-off-by: Chuck Lever 
Signed-off-by: Trond Myklebust

[PATCH] lockd endianness annotations

2006-10-20T17:26:40+00:00

Signed-off-by: Alexey Dobriyan 
Signed-off-by: Al Viro 
Acked-by: Trond Myklebust 
Acked-by: Neil Brown 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] fix svc_procfunc declaration

2006-10-20T17:26:40+00:00

svc_procfunc instances return __be32, not int

Signed-off-by: Al Viro 
Acked-by: Trond Myklebust 
Acked-by: Neil Brown 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] knfsd: Allow lockd to drop replies as appropriate

2006-10-17T15:18:46+00:00

It is possible for the ->fopen callback from lockd into nfsd to find that an
answer cannot be given straight away (an upcall is needed) and so the request
has to be 'dropped', to be retried later.  That error status is not currently
propagated back.

So:
  Change nlm_fopen to return nlm error codes (rather than a private
  protocol) and define a new nlm_drop_reply code.
  Cause nlm_drop_reply to cause the rpc request to get rpc_drop_reply
  when this error comes back.
  Cause svc_process to drop a request which returns a status of
  rpc_drop_reply.

[akpm@osdl.org: fix warning storm]
Cc: Marc Eshel 
Signed-off-by: Neil Brown 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] knfsd: match GRANTED_RES replies using cookies

2006-10-04T14:55:18+00:00

When we send a GRANTED_MSG call, we current copy the NLM cookie provided in
the original LOCK call - because in 1996, some broken clients seemed to rely
on this bug.  However, this means the cookies are not unique, so that when the
client's GRANTED_RES message comes back, we cannot simply match it based on
the cookie, but have to use the client's IP address in addition.  Which breaks
when you have a multi-homed NFS client.

The X/Open spec explicitly mentions that clients should not expect the same
cookie; so one may hope that any clients that were broken in 1996 have either
been fixed or rendered obsolete.

Signed-off-by: Olaf Kirch 
Signed-off-by: Neil Brown 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds