From: Andiry Xu
Sysfs support allows user to get/post information of running NOVA instance.
After mount, NOVA creates four entries under proc directory
/proc/fs/nova/pmem#/:
timing_statsIO_statsallocator gc
Show NOVA file operation timing statistics:
cat /proc/fs/NOVA/pmem#/timing_stats
Clear timing statistics:
echo 1 > /proc/fs/NOVA/pmem#/timing_stats
Show NOVA I/O statistics:
cat /proc/fs/NOVA/pmem#/IO_stats
Clear I/O statistics:
echo 1 > /proc/fs/NOVA/pmem#/IO_stats
Show NOVA allocator information:
cat /proc/fs/NOVA/pmem#/allocator
Manual garbage collection:
echo #inode_number > /proc/fs/NOVA/pmem#/gc
Signed-off-by: Andiry Xu
---
fs/nova/Makefile | 2 +-
fs/nova/nova.h | 6 +
fs/nova/super.c | 9 ++
fs/nova/super.h | 1 +
fs/nova/sysfs.c | 379 +++
5 files changed, 396 insertions(+), 1 deletion(-)
create mode 100644 fs/nova/sysfs.c
diff --git a/fs/nova/Makefile b/fs/nova/Makefile
index 7a5fb6d..6e1c29d 100644
--- a/fs/nova/Makefile
+++ b/fs/nova/Makefile
@@ -5,4 +5,4 @@
obj-$(CONFIG_NOVA_FS) += nova.o
nova-y := balloc.o bbuild.o dax.o dir.o file.o gc.o inode.o ioctl.o journal.o\
- log.o namei.o rebuild.o stats.o super.o symlink.o
+ log.o namei.o rebuild.o stats.o super.o symlink.o sysfs.o
diff --git a/fs/nova/nova.h b/fs/nova/nova.h
index 32b7b2f..0814676 100644
--- a/fs/nova/nova.h
+++ b/fs/nova/nova.h
@@ -546,6 +546,12 @@ int nova_block_symlink(struct super_block *sb, struct
nova_inode *pi,
struct inode *inode, const char *symname, int len, u64 epoch_id);
extern const struct inode_operations nova_symlink_inode_operations;
+/* sysfs.c */
+extern const char *proc_dirname;
+extern struct proc_dir_entry *nova_proc_root;
+void nova_sysfs_init(struct super_block *sb);
+void nova_sysfs_exit(struct super_block *sb);
+
/* stats.c */
void nova_get_timing_stats(void);
void nova_get_IO_stats(void);
diff --git a/fs/nova/super.c b/fs/nova/super.c
index 14b4af6..039c003 100644
--- a/fs/nova/super.c
+++ b/fs/nova/super.c
@@ -596,6 +596,8 @@ static int nova_fill_super(struct super_block *sb, void
*data, int silent)
goto out;
}
+ nova_sysfs_init(sb);
+
/* Init a new nova instance */
if (sbi->s_mount_opt & NOVA_MOUNT_FORMAT) {
root_pi = nova_init(sb, sbi->initsize);
@@ -680,6 +682,8 @@ static int nova_fill_super(struct super_block *sb, void
*data, int silent)
kfree(sbi->inode_maps);
sbi->inode_maps = NULL;
+ nova_sysfs_exit(sb);
+
kfree(sbi->nova_sb);
kfree(sbi);
nova_dbg("%s failed: return %d\n", __func__, retval);
@@ -783,6 +787,8 @@ static void nova_put_super(struct super_block *sb)
i, inode_map->allocated, inode_map->freed);
}
+ nova_sysfs_exit(sb);
+
kfree(sbi->inode_maps);
kfree(sbi->nova_sb);
kfree(sbi);
@@ -1007,6 +1013,8 @@ static int __init init_nova_fs(void)
nova_info("Arch new instructions support: CLWB %s\n",
support_clwb ? "YES" : "NO");
+ nova_proc_root = proc_mkdir(proc_dirname, NULL);
+
rc = init_rangenode_cache();
if (rc)
goto out;
@@ -1041,6 +1049,7 @@ static int __init init_nova_fs(void)
static void __exit exit_nova_fs(void)
{
unregister_filesystem(&nova_fs_type);
+ remove_proc_entry(proc_dirname, NULL);
destroy_file_write_item_cache();
destroy_inodecache();
destroy_rangenode_cache();
diff --git a/fs/nova/super.h b/fs/nova/super.h
index bcf9548..bcbe862 100644
--- a/fs/nova/super.h
+++ b/fs/nova/super.h
@@ -112,6 +112,7 @@ struct nova_sb_info {
struct mutexs_lock; /* protects the SB's buffer-head */
int cpus;
+ struct proc_dir_entry *s_proc;
/* Current epoch. volatile guarantees visibility */
volatile u64 s_epoch_id;
diff --git a/fs/nova/sysfs.c b/fs/nova/sysfs.c
new file mode 100644
index 000..0a73ef4
--- /dev/null
+++ b/fs/nova/sysfs.c
@@ -0,0 +1,379 @@
+/*
+ * BRIEF DESCRIPTION
+ *
+ * Proc fs operations
+ *
+ * Copyright 2015-2016 Regents of the University of California,
+ * UCSD Non-Volatile Systems Lab, Andiry Xu
+ * Copyright 2012-2013 Intel Corporation
+ * Copyright 2009-2011 Marco Stornelli
+ * Copyright 2003 Sony Corporation
+ * Copyright 2003 Matsushita Electric Industrial Co., Ltd.
+ * 2003-2004 (c) MontaVista Software, Inc. , Steve Longerbeam
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include "nova.h"
+#include "inode.h"
+
+const char *proc_dirname = "fs/NOVA";
+struct proc_dir_entry *nova_proc_root;
+
+/* == Statistics */
+static int nova_seq