NFS: Add tracepoints for debugging NFS rename and sillyrename issues

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

diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index e41dec5..dca7deb 100644 (file)
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -1909,6 +1909,7 @@ int nfs_rename(struct inode *old_dir, struct dentry *old_dentry,
                 new_dentry->d_parent->d_name.name, new_dentry->d_name.name,
                 d_count(new_dentry));
 
+       trace_nfs_rename_enter(old_dir, old_dentry, new_dir, new_dentry);
        /*
         * For non-directories, check whether the target is busy and if so,
         * make a copy of the dentry and then do a silly-rename. If the
@@ -1955,6 +1956,8 @@ int nfs_rename(struct inode *old_dir, struct dentry *old_dentry,
 out:
        if (rehash)
                d_rehash(rehash);
+       trace_nfs_rename_exit(old_dir, old_dentry,
+                       new_dir, new_dentry, error);
        if (!error) {
                if (new_inode != NULL)
                        nfs_drop_nlink(new_inode);

diff --git a/fs/nfs/nfstrace.h b/fs/nfs/nfstrace.h
index 5827906..a20f0d1 100644 (file)
--- a/fs/nfs/nfstrace.h
+++ b/fs/nfs/nfstrace.h
@@ -512,6 +512,144 @@ DEFINE_NFS_DIRECTORY_EVENT_DONE(nfs_unlink_exit);
 DEFINE_NFS_DIRECTORY_EVENT(nfs_symlink_enter);
 DEFINE_NFS_DIRECTORY_EVENT_DONE(nfs_symlink_exit);
 
+DECLARE_EVENT_CLASS(nfs_rename_event,
+               TP_PROTO(
+                       const struct inode *old_dir,
+                       const struct dentry *old_dentry,
+                       const struct inode *new_dir,
+                       const struct dentry *new_dentry
+               ),
+
+               TP_ARGS(old_dir, old_dentry, new_dir, new_dentry),
+
+               TP_STRUCT__entry(
+                       __field(dev_t, dev)
+                       __field(u64, old_dir)
+                       __field(u64, new_dir)
+                       __string(old_name, old_dentry->d_name.name)
+                       __string(new_name, new_dentry->d_name.name)
+               ),
+
+               TP_fast_assign(
+                       __entry->dev = old_dir->i_sb->s_dev;
+                       __entry->old_dir = NFS_FILEID(old_dir);
+                       __entry->new_dir = NFS_FILEID(new_dir);
+                       __assign_str(old_name, old_dentry->d_name.name);
+                       __assign_str(new_name, new_dentry->d_name.name);
+               ),
+
+               TP_printk(
+                       "old_name=%02x:%02x:%llu/%s new_name=%02x:%02x:%llu/%s",
+                       MAJOR(__entry->dev), MINOR(__entry->dev),
+                       (unsigned long long)__entry->old_dir,
+                       __get_str(old_name),
+                       MAJOR(__entry->dev), MINOR(__entry->dev),
+                       (unsigned long long)__entry->new_dir,
+                       __get_str(new_name)
+               )
+);
+#define DEFINE_NFS_RENAME_EVENT(name) \
+       DEFINE_EVENT(nfs_rename_event, name, \
+                       TP_PROTO( \
+                               const struct inode *old_dir, \
+                               const struct dentry *old_dentry, \
+                               const struct inode *new_dir, \
+                               const struct dentry *new_dentry \
+                       ), \
+                       TP_ARGS(old_dir, old_dentry, new_dir, new_dentry))
+
+DECLARE_EVENT_CLASS(nfs_rename_event_done,
+               TP_PROTO(
+                       const struct inode *old_dir,
+                       const struct dentry *old_dentry,
+                       const struct inode *new_dir,
+                       const struct dentry *new_dentry,
+                       int error
+               ),
+
+               TP_ARGS(old_dir, old_dentry, new_dir, new_dentry, error),
+
+               TP_STRUCT__entry(
+                       __field(dev_t, dev)
+                       __field(int, error)
+                       __field(u64, old_dir)
+                       __string(old_name, old_dentry->d_name.name)
+                       __field(u64, new_dir)
+                       __string(new_name, new_dentry->d_name.name)
+               ),
+
+               TP_fast_assign(
+                       __entry->dev = old_dir->i_sb->s_dev;
+                       __entry->old_dir = NFS_FILEID(old_dir);
+                       __entry->new_dir = NFS_FILEID(new_dir);
+                       __entry->error = error;
+                       __assign_str(old_name, old_dentry->d_name.name);
+                       __assign_str(new_name, new_dentry->d_name.name);
+               ),
+
+               TP_printk(
+                       "error=%d old_name=%02x:%02x:%llu/%s "
+                       "new_name=%02x:%02x:%llu/%s",
+                       __entry->error,
+                       MAJOR(__entry->dev), MINOR(__entry->dev),
+                       (unsigned long long)__entry->old_dir,
+                       __get_str(old_name),
+                       MAJOR(__entry->dev), MINOR(__entry->dev),
+                       (unsigned long long)__entry->new_dir,
+                       __get_str(new_name)
+               )
+);
+#define DEFINE_NFS_RENAME_EVENT_DONE(name) \
+       DEFINE_EVENT(nfs_rename_event_done, name, \
+                       TP_PROTO( \
+                               const struct inode *old_dir, \
+                               const struct dentry *old_dentry, \
+                               const struct inode *new_dir, \
+                               const struct dentry *new_dentry, \
+                               int error \
+                       ), \
+                       TP_ARGS(old_dir, old_dentry, new_dir, \
+                               new_dentry, error))
+
+DEFINE_NFS_RENAME_EVENT(nfs_rename_enter);
+DEFINE_NFS_RENAME_EVENT_DONE(nfs_rename_exit);
+
+DEFINE_NFS_RENAME_EVENT_DONE(nfs_sillyrename_rename);
+
+TRACE_EVENT(nfs_sillyrename_unlink,
+               TP_PROTO(
+                       const struct nfs_unlinkdata *data,
+                       int error
+               ),
+
+               TP_ARGS(data, error),
+
+               TP_STRUCT__entry(
+                       __field(dev_t, dev)
+                       __field(int, error)
+                       __field(u64, dir)
+                       __dynamic_array(char, name, data->args.name.len + 1)
+               ),
+
+               TP_fast_assign(
+                       struct inode *dir = data->dir;
+                       size_t len = data->args.name.len;
+                       __entry->dev = dir->i_sb->s_dev;
+                       __entry->dir = NFS_FILEID(dir);
+                       __entry->error = error;
+                       memcpy(__get_dynamic_array(name),
+                               data->args.name.name, len);
+                       ((char *)__get_dynamic_array(name))[len] = 0;
+               ),
+
+               TP_printk(
+                       "error=%d name=%02x:%02x:%llu/%s",
+                       __entry->error,
+                       MAJOR(__entry->dev), MINOR(__entry->dev),
+                       (unsigned long long)__entry->dir,
+                       __get_str(name)
+               )
+);
 #endif /* _TRACE_NFS_H */
 
 #undef TRACE_INCLUDE_PATH

diff --git a/fs/nfs/unlink.c b/fs/nfs/unlink.c
index 488fd16..2c1485d 100644 (file)
--- a/fs/nfs/unlink.c
+++ b/fs/nfs/unlink.c
@@ -20,6 +20,8 @@
 #include "iostat.h"
 #include "delegation.h"
 
+#include "nfstrace.h"
+
 /**
  * nfs_free_unlinkdata - release data from a sillydelete operation.
  * @data: pointer to unlink structure.
@@ -77,6 +79,7 @@ static void nfs_async_unlink_done(struct rpc_task *task, void *calldata)
        struct nfs_unlinkdata *data = calldata;
        struct inode *dir = data->dir;
 
+       trace_nfs_sillyrename_unlink(data, task->tk_status);
        if (!NFS_PROTO(dir)->unlink_done(task, dir))
                rpc_restart_call_prepare(task);
 }
@@ -336,6 +339,8 @@ static void nfs_async_rename_done(struct rpc_task *task, void *calldata)
        struct inode *new_dir = data->new_dir;
        struct dentry *old_dentry = data->old_dentry;
 
+       trace_nfs_sillyrename_rename(old_dir, old_dentry,
+                       new_dir, data->new_dentry, task->tk_status);
        if (!NFS_PROTO(old_dir)->rename_done(task, old_dir, new_dir)) {
                rpc_restart_call_prepare(task);
                return;