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NFSD: Add an nfsd_file_fsync tracepoint 

[ Upstream commit d7064eaf68 ]

Add a tracepoint to capture the number of filecache-triggered fsync
calls and which files needed it. Also, record when an fsync triggers
a write verifier reset.

Examples:

<...>-97    [007]   262.505611: nfsd_file_free:       inode=0xffff888171e08140 ref=0 flags=GC may=WRITE nf_file=0xffff8881373d2400
<...>-97    [007]   262.505612: nfsd_file_fsync:      inode=0xffff888171e08140 ref=0 flags=GC may=WRITE nf_file=0xffff8881373d2400 ret=0
<...>-97    [007]   262.505623: nfsd_file_free:       inode=0xffff888171e08dc0 ref=0 flags=GC may=WRITE nf_file=0xffff8881373d1e00
<...>-97    [007]   262.505624: nfsd_file_fsync:      inode=0xffff888171e08dc0 ref=0 flags=GC may=WRITE nf_file=0xffff8881373d1e00 ret=0

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Chuck Lever 2022-11-03 16:22:48 -04:00 committed by Greg Kroah-Hartman
parent 8dafc61430
commit 2c1be5d65d
2 changed files with 35 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
fs/nfsd/filecache.c
View File

@ -335,10 +335,13 @@ static void
nfsd_file_fsync(struct nfsd_file *nf)
{
struct file *file = nf->nf_file;
int ret;
if (!file || !(file->f_mode & FMODE_WRITE))
return;
if (vfs_fsync(file, 1) != 0)
ret = vfs_fsync(file, 1);
trace_nfsd_file_fsync(nf, ret);
if (ret)
nfsd_reset_write_verifier(net_generic(nf->nf_net, nfsd_net_id));
}

31
fs/nfsd/trace.h
View File

@ -1237,6 +1237,37 @@ DEFINE_EVENT(nfsd_file_lruwalk_class, name, \
DEFINE_NFSD_FILE_LRUWALK_EVENT(nfsd_file_gc_removed);
DEFINE_NFSD_FILE_LRUWALK_EVENT(nfsd_file_shrinker_removed);
TRACE_EVENT(nfsd_file_fsync,
TP_PROTO(
const struct nfsd_file *nf,
int ret
),
TP_ARGS(nf, ret),
TP_STRUCT__entry(
__field(void *, nf_inode)
__field(int, nf_ref)
__field(int, ret)
__field(unsigned long, nf_flags)
__field(unsigned char, nf_may)
__field(struct file *, nf_file)
),
TP_fast_assign(
__entry->nf_inode = nf->nf_inode;
__entry->nf_ref = refcount_read(&nf->nf_ref);
__entry->ret = ret;
__entry->nf_flags = nf->nf_flags;
__entry->nf_may = nf->nf_may;
__entry->nf_file = nf->nf_file;
),
TP_printk("inode=%p ref=%d flags=%s may=%s nf_file=%p ret=%d",
__entry->nf_inode,
__entry->nf_ref,
show_nf_flags(__entry->nf_flags),
show_nfsd_may_flags(__entry->nf_may),
__entry->nf_file, __entry->ret
)
);
#include "cache.h"
TRACE_DEFINE_ENUM(RC_DROPIT);