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

This reverts commit a79f194aa4879e9baad118c3f8bb2ca24dbef765.
The mechanism for aborting I/O is racy, since we are not guaranteed that
the request is asleep while we're changing both task->tk_status and
task->tk_action.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Cc: stable@vger.kernel.org # v5.1

diff --git a/fs/nfs/flexfilelayout/flexfilelayout.c b/fs/nfs/flexfilelayout/flexfilelayout.c
index b04e20d..2c7e1ec 100644 (file)
--- a/fs/nfs/flexfilelayout/flexfilelayout.c
+++ b/fs/nfs/flexfilelayout/flexfilelayout.c
@@ -1148,8 +1148,6 @@ static int ff_layout_async_handle_error_v4(struct rpc_task *task,
                break;
        case -NFS4ERR_RETRY_UNCACHED_REP:
                break;
-       case -EAGAIN:
-               return -NFS4ERR_RESET_TO_PNFS;
        /* Invalidate Layout errors */
        case -NFS4ERR_PNFS_NO_LAYOUT:
        case -ESTALE:           /* mapped NFS4ERR_STALE */
@@ -1210,7 +1208,6 @@ static int ff_layout_async_handle_error_v3(struct rpc_task *task,
        case -EBADHANDLE:
        case -ELOOP:
        case -ENOSPC:
-       case -EAGAIN:
                break;
        case -EJUKEBOX:
                nfs_inc_stats(lseg->pls_layout->plh_inode, NFSIOS_DELAY);
@@ -1445,16 +1442,6 @@ static void ff_layout_read_prepare_v4(struct rpc_task *task, void *data)
        ff_layout_read_prepare_common(task, hdr);
 }
 
-static void
-ff_layout_io_prepare_transmit(struct rpc_task *task,
-               void *data)
-{
-       struct nfs_pgio_header *hdr = data;
-
-       if (!pnfs_is_valid_lseg(hdr->lseg))
-               rpc_exit(task, -EAGAIN);
-}
-
 static void ff_layout_read_call_done(struct rpc_task *task, void *data)
 {
        struct nfs_pgio_header *hdr = data;
@@ -1740,7 +1727,6 @@ static void ff_layout_commit_release(void *data)
 
 static const struct rpc_call_ops ff_layout_read_call_ops_v3 = {
        .rpc_call_prepare = ff_layout_read_prepare_v3,
-       .rpc_call_prepare_transmit = ff_layout_io_prepare_transmit,
        .rpc_call_done = ff_layout_read_call_done,
        .rpc_count_stats = ff_layout_read_count_stats,
        .rpc_release = ff_layout_read_release,
@@ -1748,7 +1734,6 @@ static const struct rpc_call_ops ff_layout_read_call_ops_v3 = {
 
 static const struct rpc_call_ops ff_layout_read_call_ops_v4 = {
        .rpc_call_prepare = ff_layout_read_prepare_v4,
-       .rpc_call_prepare_transmit = ff_layout_io_prepare_transmit,
        .rpc_call_done = ff_layout_read_call_done,
        .rpc_count_stats = ff_layout_read_count_stats,
        .rpc_release = ff_layout_read_release,
@@ -1756,7 +1741,6 @@ static const struct rpc_call_ops ff_layout_read_call_ops_v4 = {
 
 static const struct rpc_call_ops ff_layout_write_call_ops_v3 = {
        .rpc_call_prepare = ff_layout_write_prepare_v3,
-       .rpc_call_prepare_transmit = ff_layout_io_prepare_transmit,
        .rpc_call_done = ff_layout_write_call_done,
        .rpc_count_stats = ff_layout_write_count_stats,
        .rpc_release = ff_layout_write_release,
@@ -1764,7 +1748,6 @@ static const struct rpc_call_ops ff_layout_write_call_ops_v3 = {
 
 static const struct rpc_call_ops ff_layout_write_call_ops_v4 = {
        .rpc_call_prepare = ff_layout_write_prepare_v4,
-       .rpc_call_prepare_transmit = ff_layout_io_prepare_transmit,
        .rpc_call_done = ff_layout_write_call_done,
        .rpc_count_stats = ff_layout_write_count_stats,
        .rpc_release = ff_layout_write_release,

diff --git a/include/linux/sunrpc/sched.h b/include/linux/sunrpc/sched.h
index baa3ecd..27536b9 100644 (file)
--- a/include/linux/sunrpc/sched.h
+++ b/include/linux/sunrpc/sched.h
@@ -98,7 +98,6 @@ typedef void                  (*rpc_action)(struct rpc_task *);
 
 struct rpc_call_ops {
        void (*rpc_call_prepare)(struct rpc_task *, void *);
-       void (*rpc_call_prepare_transmit)(struct rpc_task *, void *);
        void (*rpc_call_done)(struct rpc_task *, void *);
        void (*rpc_count_stats)(struct rpc_task *, void *);
        void (*rpc_release)(void *);

diff --git a/net/sunrpc/xprt.c b/net/sunrpc/xprt.c
index 783748d..2e71f54 100644 (file)
--- a/net/sunrpc/xprt.c
+++ b/net/sunrpc/xprt.c
@@ -1408,13 +1408,6 @@ xprt_request_transmit(struct rpc_rqst *req, struct rpc_task *snd_task)
                        status = -EBADMSG;
                        goto out_dequeue;
                }
-               if (task->tk_ops->rpc_call_prepare_transmit) {
-                       task->tk_ops->rpc_call_prepare_transmit(task,
-                                       task->tk_calldata);
-                       status = task->tk_status;
-                       if (status < 0)
-                               goto out_dequeue;
-               }
                if (RPC_SIGNALLED(task)) {
                        status = -ERESTARTSYS;
                        goto out_dequeue;