* [PATCH] NFSv4: Don't add a new lock on an interrupted wait for LOCK
@ 2018-05-03 11:12 Benjamin Coddington
2018-05-29 14:02 ` Trond Myklebust
2018-07-29 14:33 ` Jeff Layton
0 siblings, 2 replies; 6+ messages in thread
From: Benjamin Coddington @ 2018-05-03 11:12 UTC (permalink / raw)
To: Trond Myklebust, Anna Schumaker; +Cc: linux-nfs
If the wait for a LOCK operation is interrupted, and then the file is
closed, the locks cleanup code will assume that no new locks will be added
to the inode after it has completed. We already have a mechanism to detect
if there was signal, so let's use that to avoid recreating the local lock
once the RPC completes. Also skip re-sending the LOCK operation for the
various error cases if we were signaled.
Signed-off-by: Benjamin Coddington <bcodding@redhat.com>
---
fs/nfs/nfs4proc.c | 24 ++++++++++++++----------
1 file changed, 14 insertions(+), 10 deletions(-)
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 47f3c273245e..1aba009a5ef8 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -6345,32 +6345,36 @@ static void nfs4_lock_done(struct rpc_task *task, void *calldata)
case 0:
renew_lease(NFS_SERVER(d_inode(data->ctx->dentry)),
data->timestamp);
- if (data->arg.new_lock) {
+ if (data->arg.new_lock && !data->cancelled) {
data->fl.fl_flags &= ~(FL_SLEEP | FL_ACCESS);
- if (locks_lock_inode_wait(lsp->ls_state->inode, &data->fl) < 0) {
- rpc_restart_call_prepare(task);
+ if (locks_lock_inode_wait(lsp->ls_state->inode, &data->fl) > 0)
break;
- }
}
+
if (data->arg.new_lock_owner != 0) {
nfs_confirm_seqid(&lsp->ls_seqid, 0);
nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid);
set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
- } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid))
- rpc_restart_call_prepare(task);
+ goto out_done;
+ } else if (nfs4_update_lock_stateid(lsp, &data->res.stateid))
+ goto out_done;
+
break;
case -NFS4ERR_BAD_STATEID:
case -NFS4ERR_OLD_STATEID:
case -NFS4ERR_STALE_STATEID:
case -NFS4ERR_EXPIRED:
if (data->arg.new_lock_owner != 0) {
- if (!nfs4_stateid_match(&data->arg.open_stateid,
+ if (nfs4_stateid_match(&data->arg.open_stateid,
&lsp->ls_state->open_stateid))
- rpc_restart_call_prepare(task);
- } else if (!nfs4_stateid_match(&data->arg.lock_stateid,
+ goto out_done;
+ } else if (nfs4_stateid_match(&data->arg.lock_stateid,
&lsp->ls_stateid))
- rpc_restart_call_prepare(task);
+ goto out_done;
}
+ if (!data->cancelled)
+ rpc_restart_call_prepare(task);
+out_done:
dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
}
--
2.14.3
^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: [PATCH] NFSv4: Don't add a new lock on an interrupted wait for LOCK
2018-05-03 11:12 [PATCH] NFSv4: Don't add a new lock on an interrupted wait for LOCK Benjamin Coddington
@ 2018-05-29 14:02 ` Trond Myklebust
2018-05-30 13:18 ` Benjamin Coddington
2018-07-29 14:33 ` Jeff Layton
1 sibling, 1 reply; 6+ messages in thread
From: Trond Myklebust @ 2018-05-29 14:02 UTC (permalink / raw)
To: bcodding, anna.schumaker; +Cc: linux-nfs
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^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH] NFSv4: Don't add a new lock on an interrupted wait for LOCK
2018-05-29 14:02 ` Trond Myklebust
@ 2018-05-30 13:18 ` Benjamin Coddington
0 siblings, 0 replies; 6+ messages in thread
From: Benjamin Coddington @ 2018-05-30 13:18 UTC (permalink / raw)
To: Trond Myklebust; +Cc: anna.schumaker, linux-nfs
On 29 May 2018, at 10:02, Trond Myklebust wrote:
> On Thu, 2018-05-03 at 07:12 -0400, Benjamin Coddington wrote:
>> If the wait for a LOCK operation is interrupted, and then the file is
>> closed, the locks cleanup code will assume that no new locks will be
>> added
>> to the inode after it has completed. We already have a mechanism to
>> detect
>> if there was signal, so let's use that to avoid recreating the local
>> lock
>> once the RPC completes. Also skip re-sending the LOCK operation for
>> the
>> various error cases if we were signaled.
>>
>> Signed-off-by: Benjamin Coddington <bcodding@redhat.com>
>> ---
>> fs/nfs/nfs4proc.c | 24 ++++++++++++++----------
>> 1 file changed, 14 insertions(+), 10 deletions(-)
>>
>> diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
>> index 47f3c273245e..1aba009a5ef8 100644
>> --- a/fs/nfs/nfs4proc.c
>> +++ b/fs/nfs/nfs4proc.c
>> @@ -6345,32 +6345,36 @@ static void nfs4_lock_done(struct rpc_task
>> *task, void *calldata)
>> case 0:
>> renew_lease(NFS_SERVER(d_inode(data->ctx->dentry)),
>> data->timestamp);
>> - if (data->arg.new_lock) {
>> + if (data->arg.new_lock && !data->cancelled) {
>> data->fl.fl_flags &= ~(FL_SLEEP |
>> FL_ACCESS);
>> - if (locks_lock_inode_wait(lsp->ls_state-
>>> inode, &data->fl) < 0) {
>> - rpc_restart_call_prepare(task);
>> + if (locks_lock_inode_wait(lsp->ls_state-
>>> inode, &data->fl) > 0)
>
> AFAICS this will never be true; It looks to me as if
> locks_lock_inode_wait() always returns '0' or a negative error value.
> Am I missing something?
No you're not missing anything, you're catching a typo, it should be:
+ if (locks_lock_inode_wait(lsp->ls_state-> inode, &data->fl) < 0)
We want to break out of the switch and restart the rpc call if
locks_lock_inode_wait returns an error. Should I send another version or
can you fix it up?
Ben
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH] NFSv4: Don't add a new lock on an interrupted wait for LOCK
2018-05-03 11:12 [PATCH] NFSv4: Don't add a new lock on an interrupted wait for LOCK Benjamin Coddington
2018-05-29 14:02 ` Trond Myklebust
@ 2018-07-29 14:33 ` Jeff Layton
1 sibling, 0 replies; 6+ messages in thread
From: Jeff Layton @ 2018-07-29 14:33 UTC (permalink / raw)
To: Benjamin Coddington, Trond Myklebust, Anna Schumaker
Cc: linux-nfs, Kenneth Johansson
On Thu, 2018-05-03 at 07:12 -0400, Benjamin Coddington wrote:
> If the wait for a LOCK operation is interrupted, and then the file is
> closed, the locks cleanup code will assume that no new locks will be added
> to the inode after it has completed. We already have a mechanism to detect
> if there was signal, so let's use that to avoid recreating the local lock
> once the RPC completes. Also skip re-sending the LOCK operation for the
> various error cases if we were signaled.
>
> Signed-off-by: Benjamin Coddington <bcodding@redhat.com>
> ---
> fs/nfs/nfs4proc.c | 24 ++++++++++++++----------
> 1 file changed, 14 insertions(+), 10 deletions(-)
>
> diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
> index 47f3c273245e..1aba009a5ef8 100644
> --- a/fs/nfs/nfs4proc.c
> +++ b/fs/nfs/nfs4proc.c
> @@ -6345,32 +6345,36 @@ static void nfs4_lock_done(struct rpc_task *task, void *calldata)
> case 0:
> renew_lease(NFS_SERVER(d_inode(data->ctx->dentry)),
> data->timestamp);
> - if (data->arg.new_lock) {
> + if (data->arg.new_lock && !data->cancelled) {
> data->fl.fl_flags &= ~(FL_SLEEP | FL_ACCESS);
> - if (locks_lock_inode_wait(lsp->ls_state->inode, &data->fl) < 0) {
> - rpc_restart_call_prepare(task);
> + if (locks_lock_inode_wait(lsp->ls_state->inode, &data->fl) > 0)
> break;
It turns out that this patch is causing a problem with non-blocking lock
requests. The issue is that it doesn't handle NFS4ERR_DENIED correctly,
so we just end up requeueing the request over and over again on a non-
blocking lock.
As Trond had pointed out, the sense of the if statement is wrong here,
but there's a different issue as well. In the event that we do race in
the way you're concerned about, we'll end up with a lock set on the
server and no local record of that lock.
What's going to release that lock on the server at that point? AFAICT,
the assumption we've always had is that closing the file will end up
releasing them (via locks_remove_file) in the case where the process is
signaled, but this commit will change that.
If the concern is locks being set on the inode after the filp has
already been closed, then I think we'll need to come up with some other
way to synchronize this.
> - }
> }
> +
> if (data->arg.new_lock_owner != 0) {
> nfs_confirm_seqid(&lsp->ls_seqid, 0);
> nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid);
> set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
> - } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid))
> - rpc_restart_call_prepare(task);
> + goto out_done;
> + } else if (nfs4_update_lock_stateid(lsp, &data->res.stateid))
> + goto out_done;
> +
> break;
> case -NFS4ERR_BAD_STATEID:
> case -NFS4ERR_OLD_STATEID:
> case -NFS4ERR_STALE_STATEID:
> case -NFS4ERR_EXPIRED:
> if (data->arg.new_lock_owner != 0) {
> - if (!nfs4_stateid_match(&data->arg.open_stateid,
> + if (nfs4_stateid_match(&data->arg.open_stateid,
> &lsp->ls_state->open_stateid))
> - rpc_restart_call_prepare(task);
> - } else if (!nfs4_stateid_match(&data->arg.lock_stateid,
> + goto out_done;
> + } else if (nfs4_stateid_match(&data->arg.lock_stateid,
> &lsp->ls_stateid))
> - rpc_restart_call_prepare(task);
> + goto out_done;
> }
> + if (!data->cancelled)
> + rpc_restart_call_prepare(task);
Restarting the task should only be done when we want to poll again for
the lock immediately. In the case of something like NFS4ERR_DENIED, we
don't want to do that right away -- we'd rather the upper layer redrive
a new RPC after it has finished waiting.
> +out_done:
> dprintk("%s: done, ret = %d!\n", __func__, data->rpc_status);
> }
>
--
Jeff Layton <jlayton@kernel.org>
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH] NFSv4: Don't add a new lock on an interrupted wait for LOCK
2017-07-21 17:38 Benjamin Coddington
@ 2017-08-01 20:12 ` Jeff Layton
0 siblings, 0 replies; 6+ messages in thread
From: Jeff Layton @ 2017-08-01 20:12 UTC (permalink / raw)
To: Benjamin Coddington, Trond Myklebust, Anna Schumaker; +Cc: linux-nfs
On Fri, 2017-07-21 at 13:38 -0400, Benjamin Coddington wrote:
> If the wait for a LOCK operation is interrupted, and then the file is
> closed, the locks cleanup code will assume that no new locks will be added
> to the inode after it has completed. We already have a mechanism to detect
> if there was an interrupt, so let's use that to avoid recreating the local
> lock once the RPC completes.
>
nit: "if there was a signal"
> Signed-off-by: Benjamin Coddington <bcodding@redhat.com>
> ---
> fs/nfs/nfs4proc.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
> index dbfa18900e25..5256f429c268 100644
> --- a/fs/nfs/nfs4proc.c
> +++ b/fs/nfs/nfs4proc.c
> @@ -6100,7 +6100,7 @@ static void nfs4_lock_done(struct rpc_task *task, void *calldata)
> case 0:
> renew_lease(NFS_SERVER(d_inode(data->ctx->dentry)),
> data->timestamp);
> - if (data->arg.new_lock) {
> + if (data->arg.new_lock && !data->cancelled) {
> data->fl.fl_flags &= ~(FL_SLEEP | FL_ACCESS);
> if (locks_lock_inode_wait(lsp->ls_state->inode, &data->fl) < 0) {
> rpc_restart_call_prepare(task);
Patch looks fine though:
Reviewed-by: Jeff Layton <jlayton@redhat.com>
^ permalink raw reply [flat|nested] 6+ messages in thread
* [PATCH] NFSv4: Don't add a new lock on an interrupted wait for LOCK
@ 2017-07-21 17:38 Benjamin Coddington
2017-08-01 20:12 ` Jeff Layton
0 siblings, 1 reply; 6+ messages in thread
From: Benjamin Coddington @ 2017-07-21 17:38 UTC (permalink / raw)
To: Trond Myklebust, Anna Schumaker; +Cc: linux-nfs
If the wait for a LOCK operation is interrupted, and then the file is
closed, the locks cleanup code will assume that no new locks will be added
to the inode after it has completed. We already have a mechanism to detect
if there was an interrupt, so let's use that to avoid recreating the local
lock once the RPC completes.
Signed-off-by: Benjamin Coddington <bcodding@redhat.com>
---
fs/nfs/nfs4proc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index dbfa18900e25..5256f429c268 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -6100,7 +6100,7 @@ static void nfs4_lock_done(struct rpc_task *task, void *calldata)
case 0:
renew_lease(NFS_SERVER(d_inode(data->ctx->dentry)),
data->timestamp);
- if (data->arg.new_lock) {
+ if (data->arg.new_lock && !data->cancelled) {
data->fl.fl_flags &= ~(FL_SLEEP | FL_ACCESS);
if (locks_lock_inode_wait(lsp->ls_state->inode, &data->fl) < 0) {
rpc_restart_call_prepare(task);
--
2.9.3
^ permalink raw reply related [flat|nested] 6+ messages in thread
end of thread, other threads:[~2018-07-29 14:33 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
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2018-05-03 11:12 [PATCH] NFSv4: Don't add a new lock on an interrupted wait for LOCK Benjamin Coddington
2018-05-29 14:02 ` Trond Myklebust
2018-05-30 13:18 ` Benjamin Coddington
2018-07-29 14:33 ` Jeff Layton
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2017-07-21 17:38 Benjamin Coddington
2017-08-01 20:12 ` Jeff Layton
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