NFSv4: Add tracepoints for debugging inode manipulations

Set up basic tracepoints for debugging NFSv4 setattr, access,
readlink, readdir, get_acl set_acl get_security_label,
and set_security_label.

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

2 files changed, 73 insertions, 14 deletions

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 323475856d88..daf0854aa047 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -2315,6 +2315,7 @@ static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
         int err;
         do {
                 err = _nfs4_do_setattr(inode, cred, fattr, sattr, state, ilabel, olabel);
+                trace_nfs4_setattr(inode, err);
                 switch (err) {
                 case -NFS4ERR_OPENMODE:
                         if (!(sattr->ia_valid & ATTR_SIZE)) {
@@ -3143,8 +3144,9 @@ static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry)
         struct nfs4_exception exception = { };
         int err;
         do {
-                err = nfs4_handle_exception(NFS_SERVER(inode),
-                                _nfs4_proc_access(inode, entry),
+                err = _nfs4_proc_access(inode, entry);
+                trace_nfs4_access(inode, err);
+                err = nfs4_handle_exception(NFS_SERVER(inode), err,
                                 &exception);
         } while (exception.retry);
         return err;
@@ -3197,8 +3199,9 @@ static int nfs4_proc_readlink(struct inode *inode, struct page *page,
         struct nfs4_exception exception = { };
         int err;
         do {
-                err = nfs4_handle_exception(NFS_SERVER(inode),
-                                _nfs4_proc_readlink(inode, page, pgbase, pglen),
+                err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
+                trace_nfs4_readlink(inode, err);
+                err = nfs4_handle_exception(NFS_SERVER(inode), err,
                                 &exception);
         } while (exception.retry);
         return err;
@@ -3630,9 +3633,10 @@ static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred,
         struct nfs4_exception exception = { };
         int err;
         do {
-                err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode),
-                                _nfs4_proc_readdir(dentry, cred, cookie,
-                                        pages, count, plus),
+                err = _nfs4_proc_readdir(dentry, cred, cookie,
+                                pages, count, plus);
+                trace_nfs4_readdir(dentry->d_inode, err);
+                err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode), err,
                                 &exception);
         } while (exception.retry);
         return err;
@@ -4333,6 +4337,7 @@ static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t bufl
         ssize_t ret;
         do {
                 ret = __nfs4_get_acl_uncached(inode, buf, buflen);
+                trace_nfs4_get_acl(inode, ret);
                 if (ret >= 0)
                         break;
                 ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
@@ -4412,8 +4417,9 @@ static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen
         struct nfs4_exception exception = { };
         int err;
         do {
-                err = nfs4_handle_exception(NFS_SERVER(inode),
-                                __nfs4_proc_set_acl(inode, buf, buflen),
+                err = __nfs4_proc_set_acl(inode, buf, buflen);
+                trace_nfs4_set_acl(inode, err);
+                err = nfs4_handle_exception(NFS_SERVER(inode), err,
                                 &exception);
         } while (exception.retry);
         return err;
@@ -4466,8 +4472,9 @@ static int nfs4_get_security_label(struct inode *inode, void *buf,
                 return -EOPNOTSUPP;
 
         do {
-                err = nfs4_handle_exception(NFS_SERVER(inode),
-                                _nfs4_get_security_label(inode, buf, buflen),
+                err = _nfs4_get_security_label(inode, buf, buflen);
+                trace_nfs4_get_security_label(inode, err);
+                err = nfs4_handle_exception(NFS_SERVER(inode), err,
                                 &exception);
         } while (exception.retry);
         return err;
@@ -4519,9 +4526,10 @@ static int nfs4_do_set_security_label(struct inode *inode,
         int err;
 
         do {
-                err = nfs4_handle_exception(NFS_SERVER(inode),
-                                _nfs4_do_set_security_label(inode, ilabel,
-                                fattr, olabel),
+                err = _nfs4_do_set_security_label(inode, ilabel,
+                                fattr, olabel);
+                trace_nfs4_set_security_label(inode, err);
+                err = nfs4_handle_exception(NFS_SERVER(inode), err,
                                 &exception);
         } while (exception.retry);
         return err;
diff --git a/fs/nfs/nfs4trace.h b/fs/nfs/nfs4trace.h
index 2646a50a8208..6bd65c2c820b 100644
--- a/fs/nfs/nfs4trace.h
+++ b/fs/nfs/nfs4trace.h
@@ -461,6 +461,57 @@ DEFINE_NFS4_LOOKUP_EVENT(nfs4_remove);
 DEFINE_NFS4_LOOKUP_EVENT(nfs4_get_fs_locations);
 DEFINE_NFS4_LOOKUP_EVENT(nfs4_secinfo);
 
+DECLARE_EVENT_CLASS(nfs4_inode_event,
+                TP_PROTO(
+                        const struct inode *inode,
+                        int error
+                ),
+
+                TP_ARGS(inode, error),
+
+                TP_STRUCT__entry(
+                        __field(dev_t, dev)
+                        __field(u32, fhandle)
+                        __field(u64, fileid)
+                        __field(int, error)
+                ),
+
+                TP_fast_assign(
+                        __entry->dev = inode->i_sb->s_dev;
+                        __entry->fileid = NFS_FILEID(inode);
+                        __entry->fhandle = nfs_fhandle_hash(NFS_FH(inode));
+                        __entry->error = error;
+                ),
+
+                TP_printk(
+                        "error=%d (%s) fileid=%02x:%02x:%llu fhandle=0x%08x",
+                        __entry->error,
+                        show_nfsv4_errors(__entry->error),
+                        MAJOR(__entry->dev), MINOR(__entry->dev),
+                        (unsigned long long)__entry->fileid,
+                        __entry->fhandle
+                )
+);
+
+#define DEFINE_NFS4_INODE_EVENT(name) \
+        DEFINE_EVENT(nfs4_inode_event, name, \
+                        TP_PROTO( \
+                                const struct inode *inode, \
+                                int error \
+                        ), \
+                        TP_ARGS(inode, error))
+
+DEFINE_NFS4_INODE_EVENT(nfs4_setattr);
+DEFINE_NFS4_INODE_EVENT(nfs4_access);
+DEFINE_NFS4_INODE_EVENT(nfs4_readlink);
+DEFINE_NFS4_INODE_EVENT(nfs4_readdir);
+DEFINE_NFS4_INODE_EVENT(nfs4_get_acl);
+DEFINE_NFS4_INODE_EVENT(nfs4_set_acl);
+#ifdef CONFIG_NFS_V4_SECURITY_LABEL
+DEFINE_NFS4_INODE_EVENT(nfs4_get_security_label);
+DEFINE_NFS4_INODE_EVENT(nfs4_set_security_label);
+#endif /* CONFIG_NFS_V4_SECURITY_LABEL */
+
 #endif /* _TRACE_NFS4_H */
 
 #undef TRACE_INCLUDE_PATH