This is a note to let you know that I've just added the patch titled
NFSD: Instrument fh_verify()
to the 5.15-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-instrument-fh_verify.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit b554498f3c25bfbf10510ff24a9c5a491a8df95a
Author: Chuck Lever <chuck.lever@xxxxxxxxxx>
Date: Tue Jun 21 10:06:23 2022 -0400
NFSD: Instrument fh_verify()
[ Upstream commit 051382885552e12541cc0ebf82092be374a9ed2a ]
Capture file handles and how they map to local inodes. In particular,
NFSv4 PUTFH uses fh_verify() so we can now observe which file handles
are the target of OPEN, LOOKUP, RENAME, and so on.
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
diff --git a/fs/nfsd/nfsfh.c b/fs/nfsd/nfsfh.c
index c29baa03dfafd..5e2ed4b2a925c 100644
--- a/fs/nfsd/nfsfh.c
+++ b/fs/nfsd/nfsfh.c
@@ -331,8 +331,6 @@ fh_verify(struct svc_rqst *rqstp, struct svc_fh *fhp, umode_t type, int access)
struct dentry *dentry;
__be32 error;
- dprintk("nfsd: fh_verify(%s)\n", SVCFH_fmt(fhp));
-
if (!fhp->fh_dentry) {
error = nfsd_set_fh_dentry(rqstp, fhp);
if (error)
@@ -340,6 +338,9 @@ fh_verify(struct svc_rqst *rqstp, struct svc_fh *fhp, umode_t type, int access)
}
dentry = fhp->fh_dentry;
exp = fhp->fh_export;
+
+ trace_nfsd_fh_verify(rqstp, fhp, type, access);
+
/*
* We still have to do all these permission checks, even when
* fh_dentry is already set:
diff --git a/fs/nfsd/trace.h b/fs/nfsd/trace.h
index 56dcecd15f6de..1a8732f43c286 100644
--- a/fs/nfsd/trace.h
+++ b/fs/nfsd/trace.h
@@ -171,6 +171,52 @@ TRACE_EVENT(nfsd_compound_encode_err,
__entry->opnum, __entry->status)
);
+#define show_fs_file_type(x) \
+ __print_symbolic(x, \
+ { S_IFLNK, "LNK" }, \
+ { S_IFREG, "REG" }, \
+ { S_IFDIR, "DIR" }, \
+ { S_IFCHR, "CHR" }, \
+ { S_IFBLK, "BLK" }, \
+ { S_IFIFO, "FIFO" }, \
+ { S_IFSOCK, "SOCK" })
+
+TRACE_EVENT(nfsd_fh_verify,
+ TP_PROTO(
+ const struct svc_rqst *rqstp,
+ const struct svc_fh *fhp,
+ umode_t type,
+ int access
+ ),
+ TP_ARGS(rqstp, fhp, type, access),
+ TP_STRUCT__entry(
+ __field(unsigned int, netns_ino)
+ __sockaddr(server, rqstp->rq_xprt->xpt_remotelen)
+ __sockaddr(client, rqstp->rq_xprt->xpt_remotelen)
+ __field(u32, xid)
+ __field(u32, fh_hash)
+ __field(void *, inode)
+ __field(unsigned long, type)
+ __field(unsigned long, access)
+ ),
+ TP_fast_assign(
+ __entry->netns_ino = SVC_NET(rqstp)->ns.inum;
+ __assign_sockaddr(server, &rqstp->rq_xprt->xpt_local,
+ rqstp->rq_xprt->xpt_locallen);
+ __assign_sockaddr(client, &rqstp->rq_xprt->xpt_remote,
+ rqstp->rq_xprt->xpt_remotelen);
+ __entry->xid = be32_to_cpu(rqstp->rq_xid);
+ __entry->fh_hash = knfsd_fh_hash(&fhp->fh_handle);
+ __entry->inode = d_inode(fhp->fh_dentry);
+ __entry->type = type;
+ __entry->access = access;
+ ),
+ TP_printk("xid=0x%08x fh_hash=0x%08x inode=%p type=%s access=%s",
+ __entry->xid, __entry->fh_hash, __entry->inode,
+ show_fs_file_type(__entry->type),
+ show_nfsd_may_flags(__entry->access)
+ )
+);
DECLARE_EVENT_CLASS(nfsd_fh_err_class,
TP_PROTO(struct svc_rqst *rqstp,
