This is a note to let you know that I've just added the patch titled
NFSD: Trace filecache opens
to the 5.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
nfsd-trace-filecache-opens.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit e4ab492d4d2e1fe5ac810650dc2dc9cddd6d5cdd
Author: Chuck Lever <chuck.lever@xxxxxxxxxx>
Date: Sun Mar 27 16:42:20 2022 -0400
NFSD: Trace filecache opens
[ Upstream commit 0122e882119ddbd9efa6edfeeac3f5c704a7aeea ]
Instrument calls to nfsd_open_verified() to get a sense of the
filecache hit rate.
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/fs/nfsd/filecache.c b/fs/nfsd/filecache.c
index db9c68a3c1f3b..bdb5de8c08036 100644
--- a/fs/nfsd/filecache.c
+++ b/fs/nfsd/filecache.c
@@ -996,10 +996,11 @@ nfsd_do_file_acquire(struct svc_rqst *rqstp, struct svc_fh *fhp,
nf->nf_mark = nfsd_file_mark_find_or_create(nf);
if (nf->nf_mark) {
- if (open)
+ if (open) {
status = nfsd_open_verified(rqstp, fhp, may_flags,
&nf->nf_file);
- else
+ trace_nfsd_file_open(nf, status);
+ } else
status = nfs_ok;
} else
status = nfserr_jukebox;
diff --git a/fs/nfsd/trace.h b/fs/nfsd/trace.h
index 8327d1601d710..c4c073e85fdd9 100644
--- a/fs/nfsd/trace.h
+++ b/fs/nfsd/trace.h
@@ -795,6 +795,34 @@ TRACE_EVENT(nfsd_file_acquire,
__entry->nf_file, __entry->status)
);
+TRACE_EVENT(nfsd_file_open,
+ TP_PROTO(struct nfsd_file *nf, __be32 status),
+ TP_ARGS(nf, status),
+ TP_STRUCT__entry(
+ __field(unsigned int, nf_hashval)
+ __field(void *, nf_inode) /* cannot be dereferenced */
+ __field(int, nf_ref)
+ __field(unsigned long, nf_flags)
+ __field(unsigned long, nf_may)
+ __field(void *, nf_file) /* cannot be dereferenced */
+ ),
+ TP_fast_assign(
+ __entry->nf_hashval = nf->nf_hashval;
+ __entry->nf_inode = nf->nf_inode;
+ __entry->nf_ref = refcount_read(&nf->nf_ref);
+ __entry->nf_flags = nf->nf_flags;
+ __entry->nf_may = nf->nf_may;
+ __entry->nf_file = nf->nf_file;
+ ),
+ TP_printk("hash=0x%x inode=%p ref=%d flags=%s may=%s file=%p",
+ __entry->nf_hashval,
+ __entry->nf_inode,
+ __entry->nf_ref,
+ show_nf_flags(__entry->nf_flags),
+ show_nfsd_may_flags(__entry->nf_may),
+ __entry->nf_file)
+)
+
DECLARE_EVENT_CLASS(nfsd_file_search_class,
TP_PROTO(struct inode *inode, unsigned int hash, int found),
TP_ARGS(inode, hash, found),
