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NFSv4: change nfs4_select_rw_stateid to take a lock_context inplace of lock_owner

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The only time that a lock_context is not immediately available is in
setattr, and now that it has an open_context, it can easily find one
with nfs_get_lock_context.
This removes the need for the on-stack nfs_lockowner.

This change is preparation for correctly support flock stateids.

Signed-off-by: NeilBrown <neilb@suse.com>
Reviewed-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
NeilBrown 2016-10-13 15:26:47 +11:00 committed by Trond Myklebust
parent 29b59f9416
commit 1739347549
3 changed files with 12 additions and 16 deletions
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2
fs/nfs/nfs4_fs.h
View File

@ -457,7 +457,7 @@ extern void nfs41_handle_server_scope(struct nfs_client *,
extern void nfs4_put_lock_state(struct nfs4_lock_state *lsp);
extern int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl);
extern int nfs4_select_rw_stateid(struct nfs4_state *, fmode_t,
const struct nfs_lockowner *, nfs4_stateid *,
const struct nfs_lock_context *, nfs4_stateid *,
struct rpc_cred **);
extern struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask);

15
fs/nfs/nfs4proc.c
View File

@ -2945,12 +2945,13 @@ static int _nfs4_do_setattr(struct inode *inode,
if (nfs4_copy_delegation_stateid(inode, fmode, &arg->stateid, &delegation_cred)) {
/* Use that stateid */
} else if (truncate && ctx != NULL) {
struct nfs_lockowner lockowner = {
.l_owner = current->files,
};
struct nfs_lock_context *l_ctx;
if (!nfs4_valid_open_stateid(ctx->state))
return -EBADF;
if (nfs4_select_rw_stateid(ctx->state, FMODE_WRITE, &lockowner,
l_ctx = nfs_get_lock_context(ctx);
if (IS_ERR(l_ctx))
return PTR_ERR(l_ctx);
if (nfs4_select_rw_stateid(ctx->state, FMODE_WRITE, l_ctx,
&arg->stateid, &delegation_cred) == -EIO)
return -EBADF;
} else
@ -4576,11 +4577,7 @@ int nfs4_set_rw_stateid(nfs4_stateid *stateid,
const struct nfs_lock_context *l_ctx,
fmode_t fmode)
{
const struct nfs_lockowner *lockowner = NULL;
if (l_ctx != NULL)
lockowner = &l_ctx->lockowner;
return nfs4_select_rw_stateid(ctx->state, fmode, lockowner, stateid, NULL);
return nfs4_select_rw_stateid(ctx->state, fmode, l_ctx, stateid, NULL);
}
EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);

11
fs/nfs/nfs4state.c
View File

@ -939,20 +939,19 @@ int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl)
static int nfs4_copy_lock_stateid(nfs4_stateid *dst,
struct nfs4_state *state,
const struct nfs_lockowner *lockowner)
const struct nfs_lock_context *l_ctx)
{
struct nfs4_lock_state *lsp;
fl_owner_t fl_owner;
int ret = -ENOENT;
if (lockowner == NULL)
if (l_ctx == NULL)
goto out;
if (test_bit(LK_STATE_IN_USE, &state->flags) == 0)
goto out;
fl_owner = lockowner->l_owner;
fl_owner = l_ctx->lockowner.l_owner;
spin_lock(&state->state_lock);
lsp = __nfs4_find_lock_state(state, fl_owner);
if (lsp && test_bit(NFS_LOCK_LOST, &lsp->ls_flags))
@ -986,7 +985,7 @@ static void nfs4_copy_open_stateid(nfs4_stateid *dst, struct nfs4_state *state)
* requests.
*/
int nfs4_select_rw_stateid(struct nfs4_state *state,
fmode_t fmode, const struct nfs_lockowner *lockowner,
fmode_t fmode, const struct nfs_lock_context *l_ctx,
nfs4_stateid *dst, struct rpc_cred **cred)
{
int ret;
@ -995,7 +994,7 @@ int nfs4_select_rw_stateid(struct nfs4_state *state,
return -EIO;
if (cred != NULL)
*cred = NULL;
ret = nfs4_copy_lock_stateid(dst, state, lockowner);
ret = nfs4_copy_lock_stateid(dst, state, l_ctx);
if (ret == -EIO)
/* A lost lock - don't even consider delegations */
goto out;