NFS: add I/O performance counters
Invoke the byte and event counter macros where we want to count bytes and
events.
Clean-up: fix a possible NULL dereference in nfs_lock, and simplify
nfs_file_open.
Test-plan:
fsx and iozone on UP and SMP systems, with and without pre-emption. Watch
for memory overwrite bugs, and performance loss (significantly more CPU
required per op).
Signed-off-by: Chuck Lever <cel@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index a1554be..151b8dd 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -34,6 +34,7 @@
#include "nfs4_fs.h"
#include "delegation.h"
+#include "iostat.h"
#define NFS_PARANOIA 1
/* #define NFS_DEBUG_VERBOSE 1 */
@@ -507,6 +508,8 @@
struct nfs_fattr fattr;
long res;
+ nfs_inc_stats(inode, NFSIOS_VFSGETDENTS);
+
lock_kernel();
res = nfs_revalidate_inode(NFS_SERVER(inode), inode);
@@ -713,6 +716,7 @@
parent = dget_parent(dentry);
lock_kernel();
dir = parent->d_inode;
+ nfs_inc_stats(dir, NFSIOS_DENTRYREVALIDATE);
inode = dentry->d_inode;
if (!inode) {
@@ -844,6 +848,7 @@
dfprintk(VFS, "NFS: lookup(%s/%s)\n",
dentry->d_parent->d_name.name, dentry->d_name.name);
+ nfs_inc_stats(dir, NFSIOS_VFSLOOKUP);
res = ERR_PTR(-ENAMETOOLONG);
if (dentry->d_name.len > NFS_SERVER(dir)->namelen)
@@ -1241,6 +1246,7 @@
dfprintk(VFS, "NFS: silly-rename(%s/%s, ct=%d)\n",
dentry->d_parent->d_name.name, dentry->d_name.name,
atomic_read(&dentry->d_count));
+ nfs_inc_stats(dir, NFSIOS_SILLYRENAME);
#ifdef NFS_PARANOIA
if (!dentry->d_inode)
@@ -1640,6 +1646,8 @@
struct rpc_cred *cred;
int res = 0;
+ nfs_inc_stats(inode, NFSIOS_VFSACCESS);
+
if (mask == 0)
goto out;
/* Is this sys_access() ? */
diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c
index 4e9b3a1..fc07ce4 100644
--- a/fs/nfs/direct.c
+++ b/fs/nfs/direct.c
@@ -54,6 +54,8 @@
#include <asm/uaccess.h>
#include <asm/atomic.h>
+#include "iostat.h"
+
#define NFSDBG_FACILITY NFSDBG_VFS
#define MAX_DIRECTIO_SIZE (4096UL << PAGE_SHIFT)
@@ -67,6 +69,7 @@
struct kref kref; /* release manager */
struct list_head list; /* nfs_read_data structs */
wait_queue_head_t wait; /* wait for i/o completion */
+ struct inode * inode; /* target file of I/O */
struct page ** pages; /* pages in our buffer */
unsigned int npages; /* count of pages */
atomic_t complete, /* i/os we're waiting for */
@@ -357,7 +360,9 @@
dreq->pages = pages;
dreq->npages = nr_pages;
+ dreq->inode = inode;
+ nfs_add_stats(inode, NFSIOS_DIRECTREADBYTES, count);
rpc_clnt_sigmask(clnt, &oldset);
nfs_direct_read_schedule(dreq, inode, ctx, user_addr, count,
file_offset);
@@ -572,6 +577,7 @@
return page_count;
}
+ nfs_add_stats(inode, NFSIOS_DIRECTWRITTENBYTES, size);
result = nfs_direct_write_seg(inode, ctx, user_addr, size,
file_offset, pages, page_count);
nfs_free_user_pages(pages, page_count, 0);
@@ -581,6 +587,7 @@
break;
return result;
}
+ nfs_add_stats(inode, NFSIOS_SERVERWRITTENBYTES, result);
tot_bytes += result;
file_offset += result;
if (result < size)
diff --git a/fs/nfs/file.c b/fs/nfs/file.c
index 387809f..1cf07e4 100644
--- a/fs/nfs/file.c
+++ b/fs/nfs/file.c
@@ -32,6 +32,7 @@
#include <asm/system.h>
#include "delegation.h"
+#include "iostat.h"
#define NFSDBG_FACILITY NFSDBG_FILE
@@ -102,18 +103,15 @@
static int
nfs_file_open(struct inode *inode, struct file *filp)
{
- struct nfs_server *server = NFS_SERVER(inode);
- int (*open)(struct inode *, struct file *);
int res;
res = nfs_check_flags(filp->f_flags);
if (res)
return res;
+ nfs_inc_stats(inode, NFSIOS_VFSOPEN);
lock_kernel();
- /* Do NFSv4 open() call */
- if ((open = server->rpc_ops->file_open) != NULL)
- res = open(inode, filp);
+ res = NFS_SERVER(inode)->rpc_ops->file_open(inode, filp);
unlock_kernel();
return res;
}
@@ -124,6 +122,7 @@
/* Ensure that dirty pages are flushed out with the right creds */
if (filp->f_mode & FMODE_WRITE)
filemap_fdatawrite(filp->f_mapping);
+ nfs_inc_stats(inode, NFSIOS_VFSRELEASE);
return NFS_PROTO(inode)->file_release(inode, filp);
}
@@ -199,6 +198,7 @@
if ((file->f_mode & FMODE_WRITE) == 0)
return 0;
+ nfs_inc_stats(inode, NFSIOS_VFSFLUSH);
lock_kernel();
/* Ensure that data+attribute caches are up to date after close() */
status = nfs_wb_all(inode);
@@ -229,6 +229,7 @@
(unsigned long) count, (unsigned long) pos);
result = nfs_revalidate_file(inode, iocb->ki_filp);
+ nfs_add_stats(inode, NFSIOS_NORMALREADBYTES, count);
if (!result)
result = generic_file_aio_read(iocb, buf, count, pos);
return result;
@@ -282,6 +283,7 @@
dfprintk(VFS, "nfs: fsync(%s/%ld)\n", inode->i_sb->s_id, inode->i_ino);
+ nfs_inc_stats(inode, NFSIOS_VFSFSYNC);
lock_kernel();
status = nfs_wb_all(inode);
if (!status) {
@@ -378,6 +380,7 @@
if (!count)
goto out;
+ nfs_add_stats(inode, NFSIOS_NORMALWRITTENBYTES, count);
result = generic_file_aio_write(iocb, buf, count, pos);
out:
return result;
@@ -517,9 +520,7 @@
inode->i_sb->s_id, inode->i_ino,
fl->fl_type, fl->fl_flags,
(long long)fl->fl_start, (long long)fl->fl_end);
-
- if (!inode)
- return -EINVAL;
+ nfs_inc_stats(inode, NFSIOS_VFSLOCK);
/* No mandatory locks over NFS */
if ((inode->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID &&
@@ -544,9 +545,6 @@
inode->i_sb->s_id, inode->i_ino,
fl->fl_type, fl->fl_flags);
- if (!inode)
- return -EINVAL;
-
/*
* No BSD flocks over NFS allowed.
* Note: we could try to fake a POSIX lock request here by
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index 86b756f..8ee7411 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -753,6 +753,8 @@
struct nfs_inode *nfsi = NFS_I(inode);
int mode = inode->i_mode;
+ nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
+
NFS_ATTRTIMEO(inode) = NFS_MINATTRTIMEO(inode);
NFS_ATTRTIMEO_UPDATE(inode) = jiffies;
@@ -940,6 +942,8 @@
struct nfs_fattr fattr;
int error;
+ nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
+
if (attr->ia_valid & ATTR_SIZE) {
if (!S_ISREG(inode->i_mode) || attr->ia_size == i_size_read(inode))
attr->ia_valid &= ~ATTR_SIZE;
@@ -993,6 +997,7 @@
spin_unlock(&inode->i_lock);
}
if ((attr->ia_valid & ATTR_SIZE) != 0) {
+ nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
inode->i_size = attr->ia_size;
vmtruncate(inode, attr->ia_size);
}
@@ -1278,6 +1283,7 @@
*/
int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
{
+ nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
if (!(NFS_I(inode)->cache_validity & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA))
&& !nfs_attribute_timeout(inode))
return NFS_STALE(inode) ? -ESTALE : 0;
@@ -1294,6 +1300,7 @@
struct nfs_inode *nfsi = NFS_I(inode);
if (nfsi->cache_validity & NFS_INO_INVALID_DATA) {
+ nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
if (S_ISREG(inode->i_mode))
nfs_sync_mapping(mapping);
invalidate_inode_pages2(mapping);
@@ -1615,6 +1622,7 @@
/* Update attrtimeo value if we're out of the unstable period */
if (invalid & NFS_INO_INVALID_ATTR) {
+ nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
nfsi->attrtimeo_timestamp = jiffies;
} else if (time_after(jiffies, nfsi->attrtimeo_timestamp+nfsi->attrtimeo)) {
diff --git a/fs/nfs/read.c b/fs/nfs/read.c
index 05eb43f..ae3ddd2 100644
--- a/fs/nfs/read.c
+++ b/fs/nfs/read.c
@@ -31,6 +31,8 @@
#include <asm/system.h>
+#include "iostat.h"
+
#define NFSDBG_FACILITY NFSDBG_PAGECACHE
static int nfs_pagein_one(struct list_head *, struct inode *);
@@ -133,6 +135,8 @@
}
count -= result;
rdata->args.pgbase += result;
+ nfs_add_stats(inode, NFSIOS_SERVERREADBYTES, result);
+
/* Note: result == 0 should only happen if we're caching
* a write that extends the file and punches a hole.
*/
@@ -458,8 +462,11 @@
dprintk("NFS: %4d nfs_readpage_result, (status %d)\n",
task->tk_pid, status);
+ nfs_add_stats(data->inode, NFSIOS_SERVERREADBYTES, resp->count);
+
/* Is this a short read? */
if (task->tk_status >= 0 && resp->count < argp->count && !resp->eof) {
+ nfs_inc_stats(data->inode, NFSIOS_SHORTREAD);
/* Has the server at least made some progress? */
if (resp->count != 0) {
/* Yes, so retry the read at the end of the data */
@@ -491,6 +498,9 @@
dprintk("NFS: nfs_readpage (%p %ld@%lu)\n",
page, PAGE_CACHE_SIZE, page->index);
+ nfs_inc_stats(inode, NFSIOS_VFSREADPAGE);
+ nfs_add_stats(inode, NFSIOS_READPAGES, 1);
+
/*
* Try to flush any pending writes to the file..
*
@@ -570,6 +580,7 @@
inode->i_sb->s_id,
(long long)NFS_FILEID(inode),
nr_pages);
+ nfs_inc_stats(inode, NFSIOS_VFSREADPAGES);
if (filp == NULL) {
desc.ctx = nfs_find_open_context(inode, NULL, FMODE_READ);
@@ -582,6 +593,7 @@
if (!list_empty(&head)) {
int err = nfs_pagein_list(&head, server->rpages);
if (!ret)
+ nfs_add_stats(inode, NFSIOS_READPAGES, err);
ret = err;
}
put_nfs_open_context(desc.ctx);
diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index 92ecf24..e7c8361 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -63,6 +63,7 @@
#include <linux/smp_lock.h>
#include "delegation.h"
+#include "iostat.h"
#define NFSDBG_FACILITY NFSDBG_PAGECACHE
@@ -134,6 +135,7 @@
end = ((loff_t)page->index << PAGE_CACHE_SHIFT) + ((loff_t)offset+count);
if (i_size >= end)
return;
+ nfs_inc_stats(inode, NFSIOS_EXTENDWRITE);
i_size_write(inode, end);
}
@@ -223,6 +225,7 @@
wdata->args.pgbase += result;
written += result;
count -= result;
+ nfs_add_stats(inode, NFSIOS_SERVERWRITTENBYTES, result);
} while (count);
/* Update file length */
nfs_grow_file(page, offset, written);
@@ -279,6 +282,9 @@
int priority = wb_priority(wbc);
int err;
+ nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE);
+ nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1);
+
/*
* Note: We need to ensure that we have a reference to the inode
* if we are to do asynchronous writes. If not, waiting
@@ -343,6 +349,8 @@
struct inode *inode = mapping->host;
int err;
+ nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES);
+
err = generic_writepages(mapping, wbc);
if (err)
return err;
@@ -354,6 +362,7 @@
err = nfs_flush_inode(inode, 0, 0, wb_priority(wbc));
if (err < 0)
goto out;
+ nfs_add_stats(inode, NFSIOS_WRITEPAGES, err);
wbc->nr_to_write -= err;
if (!wbc->nonblocking && wbc->sync_mode == WB_SYNC_ALL) {
err = nfs_wait_on_requests(inode, 0, 0);
@@ -596,6 +605,9 @@
if (!bdi_write_congested(bdi))
return 0;
+
+ nfs_inc_stats(mapping->host, NFSIOS_CONGESTIONWAIT);
+
if (intr) {
struct rpc_clnt *clnt = NFS_CLIENT(mapping->host);
sigset_t oldset;
@@ -749,6 +761,8 @@
struct nfs_page *req;
int status = 0;
+ nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE);
+
dprintk("NFS: nfs_updatepage(%s/%s %d@%Ld)\n",
file->f_dentry->d_parent->d_name.name,
file->f_dentry->d_name.name, count,
@@ -1152,6 +1166,8 @@
dprintk("NFS: %4d nfs_writeback_done (status %d)\n",
task->tk_pid, task->tk_status);
+ nfs_add_stats(data->inode, NFSIOS_SERVERWRITTENBYTES, resp->count);
+
#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
if (resp->verf->committed < argp->stable && task->tk_status >= 0) {
/* We tried a write call, but the server did not
@@ -1177,6 +1193,8 @@
if (task->tk_status >= 0 && resp->count < argp->count) {
static unsigned long complain;
+ nfs_inc_stats(data->inode, NFSIOS_SHORTWRITE);
+
/* Has the server at least made some progress? */
if (resp->count != 0) {
/* Was this an NFSv2 write or an NFSv3 stable write? */