pNFS: Modify pnfs_update_layout tracepoints to use layout stateid

Instead of displaying a layout segment pointer in these tracepoints,
let's use the layout stateid, now that Olga gave us a set of tools for
displaying them.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>

3 files changed, 28 insertions, 16 deletions

diff --git a/fs/nfs/nfs4trace.c b/fs/nfs/nfs4trace.c
index d774335cc8bc..2850bce19244 100644
--- a/fs/nfs/nfs4trace.c
+++ b/fs/nfs/nfs4trace.c
@@ -6,6 +6,7 @@
 #include "internal.h"
 #include "nfs4session.h"
 #include "callback.h"
+#include "pnfs.h"
 
 #define CREATE_TRACE_POINTS
 #include "nfs4trace.h"
diff --git a/fs/nfs/nfs4trace.h b/fs/nfs/nfs4trace.h
index 238925c1aafd..d08d0c84b778 100644
--- a/fs/nfs/nfs4trace.h
+++ b/fs/nfs/nfs4trace.h
@@ -1461,10 +1461,10 @@ TRACE_EVENT(pnfs_update_layout,
                         loff_t pos,
                         u64 count,
                         enum pnfs_iomode iomode,
-                        struct pnfs_layout_segment *lseg,
+                        struct pnfs_layout_hdr *lo,
                         enum pnfs_update_layout_reason reason
                 ),
-                TP_ARGS(inode, pos, count, iomode, lseg, reason),
+                TP_ARGS(inode, pos, count, iomode, lo, reason),
                 TP_STRUCT__entry(
                         __field(dev_t, dev)
                         __field(u64, fileid)
@@ -1472,7 +1472,8 @@ TRACE_EVENT(pnfs_update_layout,
                         __field(loff_t, pos)
                         __field(u64, count)
                         __field(enum pnfs_iomode, iomode)
-                        __field(struct pnfs_layout_segment *, lseg)
+                        __field(int, layoutstateid_seq)
+                        __field(u32, layoutstateid_hash)
                         __field(enum pnfs_update_layout_reason, reason)
                 ),
                 TP_fast_assign(
@@ -1482,18 +1483,28 @@ TRACE_EVENT(pnfs_update_layout,
                         __entry->pos = pos;
                         __entry->count = count;
                         __entry->iomode = iomode;
-                        __entry->lseg = lseg;
                         __entry->reason = reason;
+                        if (lo != NULL) {
+                                __entry->layoutstateid_seq =
+                                be32_to_cpu(lo->plh_stateid.seqid);
+                                __entry->layoutstateid_hash =
+                                nfs_stateid_hash(&lo->plh_stateid);
+                        } else {
+                                __entry->layoutstateid_seq = 0;
+                                __entry->layoutstateid_hash = 0;
+                        }
                 ),
                 TP_printk(
                         "fileid=%02x:%02x:%llu fhandle=0x%08x "
-                        "iomode=%s pos=%llu count=%llu lseg=%p (%s)",
+                        "iomode=%s pos=%llu count=%llu "
+                        "layoutstateid=%d:0x%08x (%s)",
                         MAJOR(__entry->dev), MINOR(__entry->dev),
                         (unsigned long long)__entry->fileid,
                         __entry->fhandle,
                         show_pnfs_iomode(__entry->iomode),
                         (unsigned long long)__entry->pos,
-                        (unsigned long long)__entry->count, __entry->lseg,
+                        (unsigned long long)__entry->count,
+                        __entry->layoutstateid_seq, __entry->layoutstateid_hash,
                         show_pnfs_update_layout_reason(__entry->reason)
                 )
 );
diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index 1489065bb051..6095a8d42766 100644
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -1521,19 +1521,19 @@ pnfs_update_layout(struct inode *ino,
         bool first;
 
         if (!pnfs_enabled_sb(NFS_SERVER(ino))) {
-                trace_pnfs_update_layout(ino, pos, count, iomode, lseg,
+                trace_pnfs_update_layout(ino, pos, count, iomode, NULL,
                                  PNFS_UPDATE_LAYOUT_NO_PNFS);
                 goto out;
         }
 
         if (iomode == IOMODE_READ && i_size_read(ino) == 0) {
-                trace_pnfs_update_layout(ino, pos, count, iomode, lseg,
+                trace_pnfs_update_layout(ino, pos, count, iomode, NULL,
                                  PNFS_UPDATE_LAYOUT_RD_ZEROLEN);
                 goto out;
         }
 
         if (pnfs_within_mdsthreshold(ctx, ino, iomode)) {
-                trace_pnfs_update_layout(ino, pos, count, iomode, lseg,
+                trace_pnfs_update_layout(ino, pos, count, iomode, NULL,
                                  PNFS_UPDATE_LAYOUT_MDSTHRESH);
                 goto out;
         }
@@ -1544,14 +1544,14 @@ lookup_again:
         lo = pnfs_find_alloc_layout(ino, ctx, gfp_flags);
         if (lo == NULL) {
                 spin_unlock(&ino->i_lock);
-                trace_pnfs_update_layout(ino, pos, count, iomode, lseg,
+                trace_pnfs_update_layout(ino, pos, count, iomode, NULL,
                                  PNFS_UPDATE_LAYOUT_NOMEM);
                 goto out;
         }
 
         /* Do we even need to bother with this? */
         if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags)) {
-                trace_pnfs_update_layout(ino, pos, count, iomode, lseg,
+                trace_pnfs_update_layout(ino, pos, count, iomode, lo,
                                  PNFS_UPDATE_LAYOUT_BULK_RECALL);
                 dprintk("%s matches recall, use MDS\n", __func__);
                 goto out_unlock;
@@ -1560,7 +1560,7 @@ lookup_again:
         /* if LAYOUTGET already failed once we don't try again */
         if (pnfs_layout_io_test_failed(lo, iomode) &&
             !pnfs_should_retry_layoutget(lo)) {
-                trace_pnfs_update_layout(ino, pos, count, iomode, lseg,
+                trace_pnfs_update_layout(ino, pos, count, iomode, lo,
                                  PNFS_UPDATE_LAYOUT_IO_TEST_FAIL);
                 goto out_unlock;
         }
@@ -1584,7 +1584,7 @@ lookup_again:
                  */
                 lseg = pnfs_find_lseg(lo, &arg);
                 if (lseg) {
-                        trace_pnfs_update_layout(ino, pos, count, iomode, lseg,
+                        trace_pnfs_update_layout(ino, pos, count, iomode, lo,
                                         PNFS_UPDATE_LAYOUT_FOUND_CACHED);
                         goto out_unlock;
                 }
@@ -1604,13 +1604,13 @@ lookup_again:
                         dprintk("%s retrying\n", __func__);
                         goto lookup_again;
                 }
-                trace_pnfs_update_layout(ino, pos, count, iomode, lseg,
+                trace_pnfs_update_layout(ino, pos, count, iomode, lo,
                                 PNFS_UPDATE_LAYOUT_RETURN);
                 goto out_put_layout_hdr;
         }
 
         if (pnfs_layoutgets_blocked(lo)) {
-                trace_pnfs_update_layout(ino, pos, count, iomode, lseg,
+                trace_pnfs_update_layout(ino, pos, count, iomode, lo,
                                 PNFS_UPDATE_LAYOUT_BLOCKED);
                 goto out_unlock;
         }
@@ -1638,7 +1638,7 @@ lookup_again:
         lseg = send_layoutget(lo, ctx, &arg, gfp_flags);
         pnfs_clear_retry_layoutget(lo);
         atomic_dec(&lo->plh_outstanding);
-        trace_pnfs_update_layout(ino, pos, count, iomode, lseg,
+        trace_pnfs_update_layout(ino, pos, count, iomode, lo,
                                  PNFS_UPDATE_LAYOUT_SEND_LAYOUTGET);
 out_put_layout_hdr:
         if (first)