From 43622eab8d0adedbb06380a355b941289d495f57 Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Fri, 1 Nov 2019 15:33:55 -0400 Subject: [PATCH] NFS: Add a tracepoint in nfs_fh_to_dentry() Add a tracepoint in nfs_fh_to_dentry() for debugging issues with bad userspace filehandles. Signed-off-by: Trond Myklebust --- fs/nfs/export.c | 1 + fs/nfs/nfstrace.h | 33 +++++++++++++++++++++++++++++++++ 2 files changed, 34 insertions(+) diff --git a/fs/nfs/export.c b/fs/nfs/export.c index deecb67638aa..3430d6891e89 100644 --- a/fs/nfs/export.c +++ b/fs/nfs/export.c @@ -105,6 +105,7 @@ nfs_fh_to_dentry(struct super_block *sb, struct fid *fid, ret = rpc_ops->getattr(NFS_SB(sb), server_fh, fattr, label, NULL); if (ret) { dprintk("%s: getattr failed %d\n", __func__, ret); + trace_nfs_fh_to_dentry(sb, server_fh, fattr->fileid, ret); dentry = ERR_PTR(ret); goto out_free_label; } diff --git a/fs/nfs/nfstrace.h b/fs/nfs/nfstrace.h index 361cc10d6f95..f64a33d2a1d1 100644 --- a/fs/nfs/nfstrace.h +++ b/fs/nfs/nfstrace.h @@ -1065,6 +1065,39 @@ TRACE_EVENT(nfs_commit_done, ) ); +TRACE_EVENT(nfs_fh_to_dentry, + TP_PROTO( + const struct super_block *sb, + const struct nfs_fh *fh, + u64 fileid, + int error + ), + + TP_ARGS(sb, fh, fileid, error), + + TP_STRUCT__entry( + __field(int, error) + __field(dev_t, dev) + __field(u32, fhandle) + __field(u64, fileid) + ), + + TP_fast_assign( + __entry->error = error; + __entry->dev = sb->s_dev; + __entry->fileid = fileid; + __entry->fhandle = nfs_fhandle_hash(fh); + ), + + TP_printk( + "error=%d fileid=%02x:%02x:%llu fhandle=0x%08x ", + __entry->error, + MAJOR(__entry->dev), MINOR(__entry->dev), + (unsigned long long)__entry->fileid, + __entry->fhandle + ) +); + TRACE_DEFINE_ENUM(NFS_OK); TRACE_DEFINE_ENUM(NFSERR_PERM); TRACE_DEFINE_ENUM(NFSERR_NOENT); -- 2.11.0