afs: Fix file locking

Fix AFS file locking to use the correct vnode pointer and remove a member
of the afs_operation struct that is never set, but it is read and followed,
causing an oops.

This can be triggered by:

	flock -s /afs/example.com/foo sleep 1

when it calls the kernel to get a file lock.

Fixes: 590fdde7416c ("afs: Build an abstraction around an "operation" concept")
Reported-by: Dave Botsch <botsch@cnf.cornell.edu>
Signed-off-by: David Howells <dhowells@redhat.com>
Tested-by: Dave Botsch <botsch@cnf.cornell.edu>

diff --git a/fs/afs/flock.c b/fs/afs/flock.c
index 70e518f7bc19f251b5e2c0cd7cb39a41e50c5c09..71eea2a908c705561f038521a9fe074f3b7d2d80 100644 (file)
--- a/fs/afs/flock.c
+++ b/fs/afs/flock.c
@@ -71,7 +71,7 @@ static void afs_schedule_lock_extension(struct afs_vnode *vnode)
 void afs_lock_op_done(struct afs_call *call)
 {
        struct afs_operation *op = call->op;
-       struct afs_vnode *vnode = op->lock.lvnode;
+       struct afs_vnode *vnode = op->file[0].vnode;
 
        if (call->error == 0) {
                spin_lock(&vnode->lock);

diff --git a/fs/afs/internal.h b/fs/afs/internal.h
index e1621b0670cc4b018f889a80d3e55cffc6f0f1cf..519ffb104616e003aad6c75ad8f64ccc3db273fc 100644 (file)
--- a/fs/afs/internal.h
+++ b/fs/afs/internal.h
@@ -795,7 +795,6 @@ struct afs_operation {
                        struct afs_read *req;
                } fetch;
                struct {
-                       struct afs_vnode *lvnode;       /* vnode being locked */
                        afs_lock_type_t type;
                } lock;
                struct {