NFS: Add event tracing for generic NFS events

Add tracepoints for inode attribute updates, attribute revalidation,
writeback start/end fsync start/end, attribute change start/end,
permission check start/end.

The intention is to enable performance tracing using 'perf'as well as
improving debugging.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 166 insertions, 0 deletions

diff --git a/fs/nfs/nfstrace.h b/fs/nfs/nfstrace.h
new file mode 100644
index 000000000000..73c8e1edeef4
--- /dev/null
+++ b/fs/nfs/nfstrace.h
@@ -0,0 +1,166 @@
+/*
+ * Copyright (c) 2013 Trond Myklebust <Trond.Myklebust@netapp.com>
+ */
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM nfs
+
+#if !defined(_TRACE_NFS_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_NFS_H
+
+#include <linux/tracepoint.h>
+
+#define nfs_show_file_type(ftype) \
+        __print_symbolic(ftype, \
+                        { DT_UNKNOWN, "UNKNOWN" }, \
+                        { DT_FIFO, "FIFO" }, \
+                        { DT_CHR, "CHR" }, \
+                        { DT_DIR, "DIR" }, \
+                        { DT_BLK, "BLK" }, \
+                        { DT_REG, "REG" }, \
+                        { DT_LNK, "LNK" }, \
+                        { DT_SOCK, "SOCK" }, \
+                        { DT_WHT, "WHT" })
+
+#define nfs_show_cache_validity(v) \
+        __print_flags(v, "|", \
+                        { NFS_INO_INVALID_ATTR, "INVALID_ATTR" }, \
+                        { NFS_INO_INVALID_DATA, "INVALID_DATA" }, \
+                        { NFS_INO_INVALID_ATIME, "INVALID_ATIME" }, \
+                        { NFS_INO_INVALID_ACCESS, "INVALID_ACCESS" }, \
+                        { NFS_INO_INVALID_ACL, "INVALID_ACL" }, \
+                        { NFS_INO_REVAL_PAGECACHE, "REVAL_PAGECACHE" }, \
+                        { NFS_INO_REVAL_FORCED, "REVAL_FORCED" }, \
+                        { NFS_INO_INVALID_LABEL, "INVALID_LABEL" })
+
+#define nfs_show_nfsi_flags(v) \
+        __print_flags(v, "|", \
+                        { 1 << NFS_INO_ADVISE_RDPLUS, "ADVISE_RDPLUS" }, \
+                        { 1 << NFS_INO_STALE, "STALE" }, \
+                        { 1 << NFS_INO_FLUSHING, "FLUSHING" }, \
+                        { 1 << NFS_INO_FSCACHE, "FSCACHE" }, \
+                        { 1 << NFS_INO_COMMIT, "COMMIT" }, \
+                        { 1 << NFS_INO_LAYOUTCOMMIT, "NEED_LAYOUTCOMMIT" }, \
+                        { 1 << NFS_INO_LAYOUTCOMMITTING, "LAYOUTCOMMIT" })
+
+DECLARE_EVENT_CLASS(nfs_inode_event,
+                TP_PROTO(
+                        const struct inode *inode
+                ),
+
+                TP_ARGS(inode),
+
+                TP_STRUCT__entry(
+                        __field(dev_t, dev)
+                        __field(u32, fhandle)
+                        __field(u64, fileid)
+                        __field(u64, version)
+                ),
+
+                TP_fast_assign(
+                        const struct nfs_inode *nfsi = NFS_I(inode);
+                        __entry->dev = inode->i_sb->s_dev;
+                        __entry->fileid = nfsi->fileid;
+                        __entry->fhandle = nfs_fhandle_hash(&nfsi->fh);
+                        __entry->version = inode->i_version;
+                ),
+
+                TP_printk(
+                        "fileid=%02x:%02x:%llu fhandle=0x%08x version=%llu ",
+                        MAJOR(__entry->dev), MINOR(__entry->dev),
+                        (unsigned long long)__entry->fileid,
+                        __entry->fhandle,
+                        (unsigned long long)__entry->version
+                )
+);
+
+DECLARE_EVENT_CLASS(nfs_inode_event_done,
+                TP_PROTO(
+                        const struct inode *inode,
+                        int error
+                ),
+
+                TP_ARGS(inode, error),
+
+                TP_STRUCT__entry(
+                        __field(int, error)
+                        __field(dev_t, dev)
+                        __field(u32, fhandle)
+                        __field(unsigned char, type)
+                        __field(u64, fileid)
+                        __field(u64, version)
+                        __field(loff_t, size)
+                        __field(unsigned long, nfsi_flags)
+                        __field(unsigned long, cache_validity)
+                ),
+
+                TP_fast_assign(
+                        const struct nfs_inode *nfsi = NFS_I(inode);
+                        __entry->error = error;
+                        __entry->dev = inode->i_sb->s_dev;
+                        __entry->fileid = nfsi->fileid;
+                        __entry->fhandle = nfs_fhandle_hash(&nfsi->fh);
+                        __entry->type = nfs_umode_to_dtype(inode->i_mode);
+                        __entry->version = inode->i_version;
+                        __entry->size = i_size_read(inode);
+                        __entry->nfsi_flags = nfsi->flags;
+                        __entry->cache_validity = nfsi->cache_validity;
+                ),
+
+                TP_printk(
+                        "error=%d fileid=%02x:%02x:%llu fhandle=0x%08x "
+                        "type=%u (%s) version=%llu size=%lld "
+                        "cache_validity=%lu (%s) nfs_flags=%ld (%s)",
+                        __entry->error,
+                        MAJOR(__entry->dev), MINOR(__entry->dev),
+                        (unsigned long long)__entry->fileid,
+                        __entry->fhandle,
+                        __entry->type,
+                        nfs_show_file_type(__entry->type),
+                        (unsigned long long)__entry->version,
+                        (long long)__entry->size,
+                        __entry->cache_validity,
+                        nfs_show_cache_validity(__entry->cache_validity),
+                        __entry->nfsi_flags,
+                        nfs_show_nfsi_flags(__entry->nfsi_flags)
+                )
+);
+
+#define DEFINE_NFS_INODE_EVENT(name) \
+        DEFINE_EVENT(nfs_inode_event, name, \
+                        TP_PROTO( \
+                                const struct inode *inode \
+                        ), \
+                        TP_ARGS(inode))
+#define DEFINE_NFS_INODE_EVENT_DONE(name) \
+        DEFINE_EVENT(nfs_inode_event_done, name, \
+                        TP_PROTO( \
+                                const struct inode *inode, \
+                                int error \
+                        ), \
+                        TP_ARGS(inode, error))
+DEFINE_NFS_INODE_EVENT(nfs_refresh_inode_enter);
+DEFINE_NFS_INODE_EVENT_DONE(nfs_refresh_inode_exit);
+DEFINE_NFS_INODE_EVENT(nfs_revalidate_inode_enter);
+DEFINE_NFS_INODE_EVENT_DONE(nfs_revalidate_inode_exit);
+DEFINE_NFS_INODE_EVENT(nfs_invalidate_mapping_enter);
+DEFINE_NFS_INODE_EVENT_DONE(nfs_invalidate_mapping_exit);
+DEFINE_NFS_INODE_EVENT(nfs_getattr_enter);
+DEFINE_NFS_INODE_EVENT_DONE(nfs_getattr_exit);
+DEFINE_NFS_INODE_EVENT(nfs_setattr_enter);
+DEFINE_NFS_INODE_EVENT_DONE(nfs_setattr_exit);
+DEFINE_NFS_INODE_EVENT(nfs_writeback_page_enter);
+DEFINE_NFS_INODE_EVENT_DONE(nfs_writeback_page_exit);
+DEFINE_NFS_INODE_EVENT(nfs_writeback_inode_enter);
+DEFINE_NFS_INODE_EVENT_DONE(nfs_writeback_inode_exit);
+DEFINE_NFS_INODE_EVENT(nfs_fsync_enter);
+DEFINE_NFS_INODE_EVENT_DONE(nfs_fsync_exit);
+DEFINE_NFS_INODE_EVENT(nfs_access_enter);
+DEFINE_NFS_INODE_EVENT_DONE(nfs_access_exit);
+
+#endif /* _TRACE_NFS_H */
+
+#undef TRACE_INCLUDE_PATH
+#define TRACE_INCLUDE_PATH .
+#define TRACE_INCLUDE_FILE nfstrace
+/* This part must be outside protection */
+#include <trace/define_trace.h>