linux-stable.git/include/linux/sunrpc/sched.h, branch v5.2.3

SUNRPC: Add tracking of RPC level errors

2019-04-25T18:18:13+00:00

Add variables to track RPC level errors so that we can distinguish
between issue that arose in the RPC transport layer as opposed to
those arising from the reply message.

Signed-off-by: Trond Myklebust 
Signed-off-by: Anna Schumaker

SUNRPC: Simplify queue timeouts using timer_reduce()

2019-04-25T18:18:13+00:00

Simplify the setting of queue timeouts by using the timer_reduce()
function.

Signed-off-by: Trond Myklebust 
Signed-off-by: Anna Schumaker

SUNRPC: Fix up tracking of timeouts

2019-04-25T18:18:13+00:00

Add a helper to ensure that debugfs and friends print out the
correct current task timeout value.

Signed-off-by: Trond Myklebust 
Signed-off-by: Anna Schumaker

SUNRPC: Add function rpc_sleep_on_timeout()

2019-04-25T18:18:13+00:00

Clean up the RPC task sleep interfaces by replacing the task->tk_timeout
'hidden parameter' to rpc_sleep_on() with a new function that takes an
absolute timeout.

Signed-off-by: Trond Myklebust 
Signed-off-by: Anna Schumaker

SUNRPC: Remove unused argument 'action' from rpc_sleep_on_priority()

2019-04-25T18:18:12+00:00

None of the callers set the 'action' argument, so let's just remove it.

Signed-off-by: Trond Myklebust 
Signed-off-by: Anna Schumaker

SUNRPC: Fix up task signalling

2019-04-25T18:18:12+00:00

The RPC_TASK_KILLED flag should really not be set from another context
because it can clobber data in the struct task when task->tk_flags is
changed non-atomically.
Let's therefore swap out RPC_TASK_KILLED with an atomic flag, and add
a function to set that flag and safely wake up the task.

Signed-off-by: Trond Myklebust 
Signed-off-by: Anna Schumaker

Revert "SUNRPC: Micro-optimise when the task is known not to be sleeping"

2019-04-11T19:41:14+00:00

This reverts commit 009a82f6437490c262584d65a14094a818bcb747.

The ability to optimise here relies on compiler being able to optimise
away tail calls to avoid stack overflows. Unfortunately, we are seeing
reports of problems, so let's just revert.

Reported-by: Daniel Mack 
Signed-off-by: Trond Myklebust

SUNRPC: Micro-optimise when the task is known not to be sleeping

2019-03-10T18:08:19+00:00

In cases where we know the task is not sleeping, try to optimise
away the indirect call to task->tk_action() by replacing it with
a direct call.
Only change tail calls, to allow gcc to perform tail call
elimination.

Signed-off-by: Trond Myklebust

NFSv4/flexfiles: Abort I/O early if the layout segment was invalidated

2019-03-01T21:20:16+00:00

If a layout segment gets invalidated while a pNFS I/O operation
is queued for transmission, then we ideally want to abort
immediately. This is particularly the case when there is a large
number of I/O related RPCs queued in the RPC layer, and the layout
segment gets invalidated due to an ENOSPC error, or an EACCES (because
the client was fenced). We may end up forced to spam the MDS with a
lot of otherwise unnecessary LAYOUTERRORs after that I/O fails.

Signed-off-by: Trond Myklebust

NFS/NFSD/SUNRPC: replace generic creds with 'struct cred'.

2018-12-19T18:52:46+00:00

SUNRPC has two sorts of credentials, both of which appear as
"struct rpc_cred".
There are "generic credentials" which are supplied by clients
such as NFS and passed in 'struct rpc_message' to indicate
which user should be used to authorize the request, and there
are low-level credentials such as AUTH_NULL, AUTH_UNIX, AUTH_GSS
which describe the credential to be sent over the wires.

This patch replaces all the generic credentials by 'struct cred'
pointers - the credential structure used throughout Linux.

For machine credentials, there is a special 'struct cred *' pointer
which is statically allocated and recognized where needed as
having a special meaning.  A look-up of a low-level cred will
map this to a machine credential.

Signed-off-by: NeilBrown 
Acked-by: J. Bruce Fields 
Signed-off-by: Anna Schumaker