From: Olga Kornievskaia <kolga@xxxxxxxxxx>
Add a tracepoint to the SEEK operation.
Signed-off-by: Olga Kornievskaia <kolga@xxxxxxxxxx>
---
fs/nfs/nfs42proc.c | 1 +
fs/nfs/nfs4trace.h | 74 ++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 75 insertions(+)
diff --git a/fs/nfs/nfs42proc.c b/fs/nfs/nfs42proc.c
index a24349512ffe..87c0dcb8823b 100644
--- a/fs/nfs/nfs42proc.c
+++ b/fs/nfs/nfs42proc.c
@@ -678,6 +678,7 @@ static loff_t _nfs42_proc_llseek(struct file *filep,
status = nfs4_call_sync(server->client, server, &msg,
&args.seq_args, &res.seq_res, 0);
+ trace_nfs4_llseek(inode, &args, &res, status);
if (status == -ENOTSUPP)
server->caps &= ~NFS_CAP_SEEK;
if (status)
diff --git a/fs/nfs/nfs4trace.h b/fs/nfs/nfs4trace.h
index 18f149f72160..823ac436a1da 100644
--- a/fs/nfs/nfs4trace.h
+++ b/fs/nfs/nfs4trace.h
@@ -2054,6 +2054,80 @@ TRACE_EVENT(ff_layout_commit_error,
)
);
+TRACE_DEFINE_ENUM(NFS4_CONTENT_DATA);
+TRACE_DEFINE_ENUM(NFS4_CONTENT_HOLE);
+
+#define show_llseek_mode(what) \
+ __print_symbolic(what, \
+ { NFS4_CONTENT_DATA, "DATA" }, \
+ { NFS4_CONTENT_HOLE, "HOLE" })
+
+#ifdef CONFIG_NFS_V4_2
+TRACE_EVENT(nfs4_llseek,
+ TP_PROTO(
+ const struct inode *inode,
+ const struct nfs42_seek_args *args,
+ const struct nfs42_seek_res *res,
+ int error
+ ),
+
+ TP_ARGS(inode, args, res, error),
+
+ TP_STRUCT__entry(
+ __field(unsigned long, error)
+ __field(u32, fhandle)
+ __field(u32, fileid)
+ __field(dev_t, dev)
+ __field(int, stateid_seq)
+ __field(u32, stateid_hash)
+ __field(loff_t, offset_s)
+ __field(u32, what)
+ __field(loff_t, offset_r)
+ __field(u32, eof)
+ ),
+
+ TP_fast_assign(
+ const struct nfs_inode *nfsi = NFS_I(inode);
+ const struct nfs_fh *fh = args->sa_fh;
+
+ __entry->fileid = nfsi->fileid;
+ __entry->dev = inode->i_sb->s_dev;
+ __entry->fhandle = nfs_fhandle_hash(fh);
+ __entry->offset_s = args->sa_offset;
+ __entry->stateid_seq =
+ be32_to_cpu(args->sa_stateid.seqid);
+ __entry->stateid_hash =
+ nfs_stateid_hash(&args->sa_stateid);
+ __entry->what = args->sa_what;
+ if (error) {
+ __entry->error = -error;
+ __entry->offset_r = 0;
+ __entry->eof = 0;
+ } else {
+ __entry->error = 0;
+ __entry->offset_r = res->sr_offset;
+ __entry->eof = res->sr_eof;
+ }
+ ),
+
+ TP_printk(
+ "error=%ld (%s) fileid=%02x:%02x:%llu fhandle=0x%08x "
+ "stateid=%d:0x%08x offset_s=%llu what=%s "
+ "offset_r=%llu eof=%u",
+ -__entry->error,
+ show_nfs4_status(__entry->error),
+ MAJOR(__entry->dev), MINOR(__entry->dev),
+ (unsigned long long)__entry->fileid,
+ __entry->fhandle,
+ __entry->stateid_seq, __entry->stateid_hash,
+ __entry->offset_s,
+ show_llseek_mode(__entry->what),
+ __entry->offset_r,
+ __entry->eof
+ )
+);
+
+#endif /* CONFIG_NFS_V4_2 */
#endif /* CONFIG_NFS_V4_1 */
--
2.27.0
