pNFS/flexfiles: Record resend attempts on I/O failure

If the attempt to do pNFS fails, then record what action we
take to recover (resend, reset to pnfs or reset to mds).

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

diff --git a/fs/nfs/flexfilelayout/flexfilelayout.c b/fs/nfs/flexfilelayout/flexfilelayout.c
index 5657b7f..3163b78 100644 (file)
--- a/fs/nfs/flexfilelayout/flexfilelayout.c
+++ b/fs/nfs/flexfilelayout/flexfilelayout.c
@@ -1321,7 +1321,6 @@ static int ff_layout_read_done_cb(struct rpc_task *task,
        int new_idx = hdr->pgio_mirror_idx;
        int err;
 
-       trace_nfs4_pnfs_read(hdr, task->tk_status);
        if (task->tk_status < 0)
                ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
                                            hdr->args.offset, hdr->args.count,
@@ -1331,6 +1330,7 @@ static int ff_layout_read_done_cb(struct rpc_task *task,
                                           hdr->ds_clp, hdr->lseg,
                                           hdr->pgio_mirror_idx);
 
+       trace_nfs4_pnfs_read(hdr, err);
        clear_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
        clear_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
        switch (err) {
@@ -1494,7 +1494,6 @@ static int ff_layout_write_done_cb(struct rpc_task *task,
        loff_t end_offs = 0;
        int err;
 
-       trace_nfs4_pnfs_write(hdr, task->tk_status);
        if (task->tk_status < 0)
                ff_layout_io_track_ds_error(hdr->lseg, hdr->pgio_mirror_idx,
                                            hdr->args.offset, hdr->args.count,
@@ -1504,6 +1503,7 @@ static int ff_layout_write_done_cb(struct rpc_task *task,
                                           hdr->ds_clp, hdr->lseg,
                                           hdr->pgio_mirror_idx);
 
+       trace_nfs4_pnfs_write(hdr, err);
        clear_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
        clear_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
        switch (err) {
@@ -1537,7 +1537,6 @@ static int ff_layout_commit_done_cb(struct rpc_task *task,
 {
        int err;
 
-       trace_nfs4_pnfs_commit_ds(data, task->tk_status);
        if (task->tk_status < 0)
                ff_layout_io_track_ds_error(data->lseg, data->ds_commit_index,
                                            data->args.offset, data->args.count,
@@ -1546,6 +1545,7 @@ static int ff_layout_commit_done_cb(struct rpc_task *task,
        err = ff_layout_async_handle_error(task, NULL, data->ds_clp,
                                           data->lseg, data->ds_commit_index);
 
+       trace_nfs4_pnfs_commit_ds(data, err);
        switch (err) {
        case -NFS4ERR_RESET_TO_PNFS:
                pnfs_generic_prepare_to_resend_writes(data);

diff --git a/fs/nfs/nfs4trace.h b/fs/nfs/nfs4trace.h
index 99d3c70..c83a7db 100644 (file)
--- a/fs/nfs/nfs4trace.h
+++ b/fs/nfs/nfs4trace.h
@@ -155,6 +155,9 @@ TRACE_DEFINE_ENUM(NFS4ERR_WRONG_CRED);
 TRACE_DEFINE_ENUM(NFS4ERR_WRONG_TYPE);
 TRACE_DEFINE_ENUM(NFS4ERR_XDEV);
 
+TRACE_DEFINE_ENUM(NFS4ERR_RESET_TO_MDS);
+TRACE_DEFINE_ENUM(NFS4ERR_RESET_TO_PNFS);
+
 #define show_nfsv4_errors(error) \
        __print_symbolic(error, \
                { NFS4_OK, "OK" }, \
@@ -305,7 +308,10 @@ TRACE_DEFINE_ENUM(NFS4ERR_XDEV);
                { NFS4ERR_WRONGSEC, "WRONGSEC" }, \
                { NFS4ERR_WRONG_CRED, "WRONG_CRED" }, \
                { NFS4ERR_WRONG_TYPE, "WRONG_TYPE" }, \
-               { NFS4ERR_XDEV, "XDEV" })
+               { NFS4ERR_XDEV, "XDEV" }, \
+               /* ***** Internal to Linux NFS client ***** */ \
+               { NFS4ERR_RESET_TO_MDS, "RESET_TO_MDS" }, \
+               { NFS4ERR_RESET_TO_PNFS, "RESET_TO_PNFS" })
 
 #define show_open_flags(flags) \
        __print_flags(flags, "|", \

diff --git a/fs/nfs/pnfs.h b/fs/nfs/pnfs.h
index f8a3806..0fafdad 100644 (file)
--- a/fs/nfs/pnfs.h
+++ b/fs/nfs/pnfs.h
@@ -79,6 +79,10 @@ enum pnfs_try_status {
        PNFS_TRY_AGAIN     = 2,
 };
 
+/* error codes for internal use */
+#define NFS4ERR_RESET_TO_MDS   12001
+#define NFS4ERR_RESET_TO_PNFS  12002
+
 #ifdef CONFIG_NFS_V4_1
 
 #define LAYOUT_NFSV4_1_MODULE_PREFIX "nfs-layouttype4"
@@ -91,10 +95,6 @@ enum pnfs_try_status {
 #define NFS4_DEF_DS_RETRANS 5
 #define PNFS_DEVICE_RETRY_TIMEOUT (120*HZ)
 
-/* error codes for internal use */
-#define NFS4ERR_RESET_TO_MDS   12001
-#define NFS4ERR_RESET_TO_PNFS  12002
-
 enum {
        NFS_LAYOUT_RO_FAILED = 0,       /* get ro layout failed stop trying */
        NFS_LAYOUT_RW_FAILED,           /* get rw layout failed stop trying */