Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=e6e21970baff4845de74584e2efc8c964a55d574
Commit: e6e21970baff4845de74584e2efc8c964a55d574
Parent: bb22629ee87eed5054f8b508dbe7c58abad0a324
Author: Trond Myklebust <[EMAIL PROTECTED]>
AuthorDate: Wed Jan 2 16:27:16 2008 -0500
Committer: Trond Myklebust <[EMAIL PROTECTED]>
CommitDate: Thu Jan 3 09:37:17 2008 -0500
NFSv4: Fix open_to_lock_owner sequenceid allocation...
NFSv4 file locking is currently completely broken since it doesn't respect
the OPEN sequencing when it is given an unconfirmed lock_owner and needs to
do an open_to_lock_owner. Worse: it breaks the sunrpc rules by doing a
GFP_KERNEL allocation inside an rpciod callback.
Fix is to preallocate the open seqid structure in nfs4_alloc_lockdata if we
see that the lock_owner is unconfirmed.
Then, in nfs4_lock_prepare() we wait for either the open_seqid, if
the lock_owner is still unconfirmed, or else fall back to waiting on the
standard lock_seqid.
Signed-off-by: Trond Myklebust <[EMAIL PROTECTED]>
---
fs/nfs/nfs4proc.c | 30 +++++++++++++++++++-----------
1 files changed, 19 insertions(+), 11 deletions(-)
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 571b5ec..9e2e1c7 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -3331,6 +3331,12 @@ static struct nfs4_lockdata *nfs4_alloc_lockdata(struct
file_lock *fl,
p->arg.fh = NFS_FH(inode);
p->arg.fl = &p->fl;
+ if (!(lsp->ls_seqid.flags & NFS_SEQID_CONFIRMED)) {
+ p->arg.open_seqid =
nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid);
+ if (p->arg.open_seqid == NULL)
+ goto out_free;
+
+ }
p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid);
if (p->arg.lock_seqid == NULL)
goto out_free;
@@ -3343,6 +3349,8 @@ static struct nfs4_lockdata *nfs4_alloc_lockdata(struct
file_lock *fl,
memcpy(&p->fl, fl, sizeof(p->fl));
return p;
out_free:
+ if (p->arg.open_seqid != NULL)
+ nfs_free_seqid(p->arg.open_seqid);
kfree(p);
return NULL;
}
@@ -3359,23 +3367,23 @@ static void nfs4_lock_prepare(struct rpc_task *task,
void *calldata)
.rpc_cred = sp->so_cred,
};
- if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
- return;
dprintk("%s: begin!\n", __FUNCTION__);
/* Do we need to do an open_to_lock_owner? */
if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) {
- data->arg.open_seqid = nfs_alloc_seqid(&sp->so_seqid);
- if (data->arg.open_seqid == NULL) {
- data->rpc_status = -ENOMEM;
- task->tk_action = NULL;
- goto out;
- }
+ if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0)
+ return;
data->arg.open_stateid = &state->stateid;
data->arg.new_lock_owner = 1;
+ /* Retest in case we raced... */
+ if (!(data->arg.lock_seqid->sequence->flags &
NFS_SEQID_CONFIRMED))
+ goto do_rpc;
}
+ if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
+ return;
+ data->arg.new_lock_owner = 0;
+do_rpc:
data->timestamp = jiffies;
rpc_call_setup(task, &msg, 0);
-out:
dprintk("%s: done!, ret = %d\n", __FUNCTION__, data->rpc_status);
}
@@ -3411,8 +3419,6 @@ static void nfs4_lock_release(void *calldata)
struct nfs4_lockdata *data = calldata;
dprintk("%s: begin!\n", __FUNCTION__);
- if (data->arg.open_seqid != NULL)
- nfs_free_seqid(data->arg.open_seqid);
if (data->cancelled != 0) {
struct rpc_task *task;
task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
@@ -3422,6 +3428,8 @@ static void nfs4_lock_release(void *calldata)
dprintk("%s: cancelling lock!\n", __FUNCTION__);
} else
nfs_free_seqid(data->arg.lock_seqid);
+ if (data->arg.open_seqid != NULL)
+ nfs_free_seqid(data->arg.open_seqid);
nfs4_put_lock_state(data->lsp);
put_nfs_open_context(data->ctx);
kfree(data);
-
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